brintos / linux-shallow public Read only

1// SPDX-License-Identifier: LGPL-2.12/*3 *4 *   Copyright (C) International Business Machines  Corp., 2009, 20135 *                 Etersoft, 20126 *   Author(s): Steve French (sfrench@us.ibm.com)7 *              Pavel Shilovsky (pshilovsky@samba.org) 20128 *9 *   Contains the routines for constructing the SMB2 PDUs themselves10 *11 */12 13 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */14 /* Note that there are handle based routines which must be		      */15 /* treated slightly differently for reconnection purposes since we never     */16 /* want to reuse a stale file handle and only the caller knows the file info */17 18#include <linux/fs.h>19#include <linux/kernel.h>20#include <linux/vfs.h>21#include <linux/task_io_accounting_ops.h>22#include <linux/uaccess.h>23#include <linux/uuid.h>24#include <linux/pagemap.h>25#include <linux/xattr.h>26#include <linux/netfs.h>27#include <trace/events/netfs.h>28#include "cifsglob.h"29#include "cifsacl.h"30#include "cifsproto.h"31#include "smb2proto.h"32#include "cifs_unicode.h"33#include "cifs_debug.h"34#include "ntlmssp.h"35#include "../common/smb2status.h"36#include "smb2glob.h"37#include "cifspdu.h"38#include "cifs_spnego.h"39#include "smbdirect.h"40#include "trace.h"41#ifdef CONFIG_CIFS_DFS_UPCALL42#include "dfs_cache.h"43#endif44#include "cached_dir.h"45#include "compress.h"46 47/*48 *  The following table defines the expected "StructureSize" of SMB2 requests49 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.50 *51 *  Note that commands are defined in smb2pdu.h in le16 but the array below is52 *  indexed by command in host byte order.53 */54static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {55	/* SMB2_NEGOTIATE */ 36,56	/* SMB2_SESSION_SETUP */ 25,57	/* SMB2_LOGOFF */ 4,58	/* SMB2_TREE_CONNECT */	9,59	/* SMB2_TREE_DISCONNECT */ 4,60	/* SMB2_CREATE */ 57,61	/* SMB2_CLOSE */ 24,62	/* SMB2_FLUSH */ 24,63	/* SMB2_READ */	49,64	/* SMB2_WRITE */ 49,65	/* SMB2_LOCK */	48,66	/* SMB2_IOCTL */ 57,67	/* SMB2_CANCEL */ 4,68	/* SMB2_ECHO */ 4,69	/* SMB2_QUERY_DIRECTORY */ 33,70	/* SMB2_CHANGE_NOTIFY */ 32,71	/* SMB2_QUERY_INFO */ 41,72	/* SMB2_SET_INFO */ 33,73	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */74};75 76int smb3_encryption_required(const struct cifs_tcon *tcon)77{78	if (!tcon || !tcon->ses)79		return 0;80	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||81	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))82		return 1;83	if (tcon->seal &&84	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))85		return 1;86	if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&87	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))88		return 1;89	return 0;90}91 92static void93smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,94		  const struct cifs_tcon *tcon,95		  struct TCP_Server_Info *server)96{97	struct smb3_hdr_req *smb3_hdr;98 99	shdr->ProtocolId = SMB2_PROTO_NUMBER;100	shdr->StructureSize = cpu_to_le16(64);101	shdr->Command = smb2_cmd;102 103	if (server) {104		/* After reconnect SMB3 must set ChannelSequence on subsequent reqs */105		if (server->dialect >= SMB30_PROT_ID) {106			smb3_hdr = (struct smb3_hdr_req *)shdr;107			/*108			 * if primary channel is not set yet, use default109			 * channel for chan sequence num110			 */111			if (SERVER_IS_CHAN(server))112				smb3_hdr->ChannelSequence =113					cpu_to_le16(server->primary_server->channel_sequence_num);114			else115				smb3_hdr->ChannelSequence =116					cpu_to_le16(server->channel_sequence_num);117		}118		spin_lock(&server->req_lock);119		/* Request up to 10 credits but don't go over the limit. */120		if (server->credits >= server->max_credits)121			shdr->CreditRequest = cpu_to_le16(0);122		else123			shdr->CreditRequest = cpu_to_le16(124				min_t(int, server->max_credits -125						server->credits, 10));126		spin_unlock(&server->req_lock);127	} else {128		shdr->CreditRequest = cpu_to_le16(2);129	}130	shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);131 132	if (!tcon)133		goto out;134 135	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */136	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */137	if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))138		shdr->CreditCharge = cpu_to_le16(1);139	/* else CreditCharge MBZ */140 141	shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);142	/* Uid is not converted */143	if (tcon->ses)144		shdr->SessionId = cpu_to_le64(tcon->ses->Suid);145 146	/*147	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have148	 * to pass the path on the Open SMB prefixed by \\server\share.149	 * Not sure when we would need to do the augmented path (if ever) and150	 * setting this flag breaks the SMB2 open operation since it is151	 * illegal to send an empty path name (without \\server\share prefix)152	 * when the DFS flag is set in the SMB open header. We could153	 * consider setting the flag on all operations other than open154	 * but it is safer to net set it for now.155	 */156/*	if (tcon->share_flags & SHI1005_FLAGS_DFS)157		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */158 159	if (server && server->sign && !smb3_encryption_required(tcon))160		shdr->Flags |= SMB2_FLAGS_SIGNED;161out:162	return;163}164 165/* helper function for code reuse */166static int167cifs_chan_skip_or_disable(struct cifs_ses *ses,168			  struct TCP_Server_Info *server,169			  bool from_reconnect)170{171	struct TCP_Server_Info *pserver;172	unsigned int chan_index;173 174	if (SERVER_IS_CHAN(server)) {175		cifs_dbg(VFS,176			"server %s does not support multichannel anymore. Skip secondary channel\n",177			 ses->server->hostname);178 179		spin_lock(&ses->chan_lock);180		chan_index = cifs_ses_get_chan_index(ses, server);181		if (chan_index == CIFS_INVAL_CHAN_INDEX) {182			spin_unlock(&ses->chan_lock);183			goto skip_terminate;184		}185 186		ses->chans[chan_index].server = NULL;187		server->terminate = true;188		spin_unlock(&ses->chan_lock);189 190		/*191		 * the above reference of server by channel192		 * needs to be dropped without holding chan_lock193		 * as cifs_put_tcp_session takes a higher lock194		 * i.e. cifs_tcp_ses_lock195		 */196		cifs_put_tcp_session(server, from_reconnect);197 198		cifs_signal_cifsd_for_reconnect(server, false);199 200		/* mark primary server as needing reconnect */201		pserver = server->primary_server;202		cifs_signal_cifsd_for_reconnect(pserver, false);203skip_terminate:204		return -EHOSTDOWN;205	}206 207	cifs_server_dbg(VFS,208		"server does not support multichannel anymore. Disable all other channels\n");209	cifs_disable_secondary_channels(ses);210 211 212	return 0;213}214 215static int216smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,217	       struct TCP_Server_Info *server, bool from_reconnect)218{219	int rc = 0;220	struct nls_table *nls_codepage = NULL;221	struct cifs_ses *ses;222	int xid;223 224	/*225	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so226	 * check for tcp and smb session status done differently227	 * for those three - in the calling routine.228	 */229	if (tcon == NULL)230		return 0;231 232	/*233	 * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in234	 * cifs_tree_connect().235	 */236	if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)237		return 0;238 239	spin_lock(&tcon->tc_lock);240	if (tcon->status == TID_EXITING) {241		/*242		 * only tree disconnect allowed when disconnecting ...243		 */244		if (smb2_command != SMB2_TREE_DISCONNECT) {245			spin_unlock(&tcon->tc_lock);246			cifs_dbg(FYI, "can not send cmd %d while umounting\n",247				 smb2_command);248			return -ENODEV;249		}250	}251	spin_unlock(&tcon->tc_lock);252 253	ses = tcon->ses;254	if (!ses)255		return -EIO;256	spin_lock(&ses->ses_lock);257	if (ses->ses_status == SES_EXITING) {258		spin_unlock(&ses->ses_lock);259		return -EIO;260	}261	spin_unlock(&ses->ses_lock);262	if (!ses->server || !server)263		return -EIO;264 265	spin_lock(&server->srv_lock);266	if (server->tcpStatus == CifsNeedReconnect) {267		/*268		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE269		 * here since they are implicitly done when session drops.270		 */271		switch (smb2_command) {272		/*273		 * BB Should we keep oplock break and add flush to exceptions?274		 */275		case SMB2_TREE_DISCONNECT:276		case SMB2_CANCEL:277		case SMB2_CLOSE:278		case SMB2_OPLOCK_BREAK:279			spin_unlock(&server->srv_lock);280			return -EAGAIN;281		}282	}283 284	/* if server is marked for termination, cifsd will cleanup */285	if (server->terminate) {286		spin_unlock(&server->srv_lock);287		return -EHOSTDOWN;288	}289	spin_unlock(&server->srv_lock);290 291again:292	rc = cifs_wait_for_server_reconnect(server, tcon->retry);293	if (rc)294		return rc;295 296	spin_lock(&ses->chan_lock);297	if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {298		spin_unlock(&ses->chan_lock);299		return 0;300	}301	spin_unlock(&ses->chan_lock);302	cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",303		 tcon->ses->chans_need_reconnect,304		 tcon->need_reconnect);305 306	mutex_lock(&ses->session_mutex);307	/*308	 * if this is called by delayed work, and the channel has been disabled309	 * in parallel, the delayed work can continue to execute in parallel310	 * there's a chance that this channel may not exist anymore311	 */312	spin_lock(&server->srv_lock);313	if (server->tcpStatus == CifsExiting) {314		spin_unlock(&server->srv_lock);315		mutex_unlock(&ses->session_mutex);316		rc = -EHOSTDOWN;317		goto out;318	}319 320	/*321	 * Recheck after acquire mutex. If another thread is negotiating322	 * and the server never sends an answer the socket will be closed323	 * and tcpStatus set to reconnect.324	 */325	if (server->tcpStatus == CifsNeedReconnect) {326		spin_unlock(&server->srv_lock);327		mutex_unlock(&ses->session_mutex);328 329		if (tcon->retry)330			goto again;331 332		rc = -EHOSTDOWN;333		goto out;334	}335	spin_unlock(&server->srv_lock);336 337	nls_codepage = ses->local_nls;338 339	/*340	 * need to prevent multiple threads trying to simultaneously341	 * reconnect the same SMB session342	 */343	spin_lock(&ses->ses_lock);344	spin_lock(&ses->chan_lock);345	if (!cifs_chan_needs_reconnect(ses, server) &&346	    ses->ses_status == SES_GOOD) {347		spin_unlock(&ses->chan_lock);348		spin_unlock(&ses->ses_lock);349		/* this means that we only need to tree connect */350		if (tcon->need_reconnect)351			goto skip_sess_setup;352 353		mutex_unlock(&ses->session_mutex);354		goto out;355	}356	spin_unlock(&ses->chan_lock);357	spin_unlock(&ses->ses_lock);358 359	rc = cifs_negotiate_protocol(0, ses, server);360	if (!rc) {361		/*362		 * if server stopped supporting multichannel363		 * and the first channel reconnected, disable all the others.364		 */365		if (ses->chan_count > 1 &&366		    !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {367			rc = cifs_chan_skip_or_disable(ses, server,368						       from_reconnect);369			if (rc) {370				mutex_unlock(&ses->session_mutex);371				goto out;372			}373		}374 375		rc = cifs_setup_session(0, ses, server, nls_codepage);376		if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {377			/*378			 * Try alternate password for next reconnect (key rotation379			 * could be enabled on the server e.g.) if an alternate380			 * password is available and the current password is expired,381			 * but do not swap on non pwd related errors like host down382			 */383			if (ses->password2)384				swap(ses->password2, ses->password);385		}386 387		if ((rc == -EACCES) && !tcon->retry) {388			mutex_unlock(&ses->session_mutex);389			rc = -EHOSTDOWN;390			goto failed;391		} else if (rc) {392			mutex_unlock(&ses->session_mutex);393			goto out;394		}395	} else {396		mutex_unlock(&ses->session_mutex);397		goto out;398	}399 400skip_sess_setup:401	if (!tcon->need_reconnect) {402		mutex_unlock(&ses->session_mutex);403		goto out;404	}405	cifs_mark_open_files_invalid(tcon);406	if (tcon->use_persistent)407		tcon->need_reopen_files = true;408 409	rc = cifs_tree_connect(0, tcon, nls_codepage);410 411	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);412	if (rc) {413		/* If sess reconnected but tcon didn't, something strange ... */414		mutex_unlock(&ses->session_mutex);415		cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);416		goto out;417	}418 419	spin_lock(&ses->ses_lock);420	if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {421		spin_unlock(&ses->ses_lock);422		mutex_unlock(&ses->session_mutex);423		goto skip_add_channels;424	}425	ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;426	spin_unlock(&ses->ses_lock);427 428	if (!rc &&429	    (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&430	    server->ops->query_server_interfaces) {431		mutex_unlock(&ses->session_mutex);432 433		/*434		 * query server network interfaces, in case they change435		 */436		xid = get_xid();437		rc = server->ops->query_server_interfaces(xid, tcon, false);438		free_xid(xid);439 440		if (rc == -EOPNOTSUPP && ses->chan_count > 1) {441			/*442			 * some servers like Azure SMB server do not advertise443			 * that multichannel has been disabled with server444			 * capabilities, rather return STATUS_NOT_IMPLEMENTED.445			 * treat this as server not supporting multichannel446			 */447 448			rc = cifs_chan_skip_or_disable(ses, server,449						       from_reconnect);450			goto skip_add_channels;451		} else if (rc)452			cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",453				 __func__, rc);454 455		if (ses->chan_max > ses->chan_count &&456		    ses->iface_count &&457		    !SERVER_IS_CHAN(server)) {458			if (ses->chan_count == 1) {459				cifs_server_dbg(VFS, "supports multichannel now\n");460				queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,461						 (SMB_INTERFACE_POLL_INTERVAL * HZ));462			}463 464			cifs_try_adding_channels(ses);465		}466	} else {467		mutex_unlock(&ses->session_mutex);468	}469 470skip_add_channels:471	spin_lock(&ses->ses_lock);472	ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;473	spin_unlock(&ses->ses_lock);474 475	if (smb2_command != SMB2_INTERNAL_CMD)476		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);477 478	atomic_inc(&tconInfoReconnectCount);479out:480	/*481	 * Check if handle based operation so we know whether we can continue482	 * or not without returning to caller to reset file handle.483	 */484	/*485	 * BB Is flush done by server on drop of tcp session? Should we special486	 * case it and skip above?487	 */488	switch (smb2_command) {489	case SMB2_FLUSH:490	case SMB2_READ:491	case SMB2_WRITE:492	case SMB2_LOCK:493	case SMB2_QUERY_DIRECTORY:494	case SMB2_CHANGE_NOTIFY:495	case SMB2_QUERY_INFO:496	case SMB2_SET_INFO:497		rc = -EAGAIN;498	}499failed:500	return rc;501}502 503static void504fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,505	       struct TCP_Server_Info *server,506	       void *buf,507	       unsigned int *total_len)508{509	struct smb2_pdu *spdu = buf;510	/* lookup word count ie StructureSize from table */511	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];512 513	/*514	 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of515	 * largest operations (Create)516	 */517	memset(buf, 0, 256);518 519	smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);520	spdu->StructureSize2 = cpu_to_le16(parmsize);521 522	*total_len = parmsize + sizeof(struct smb2_hdr);523}524 525/*526 * Allocate and return pointer to an SMB request hdr, and set basic527 * SMB information in the SMB header. If the return code is zero, this528 * function must have filled in request_buf pointer.529 */530static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,531				 struct TCP_Server_Info *server,532				 void **request_buf, unsigned int *total_len)533{534	/* BB eventually switch this to SMB2 specific small buf size */535	switch (smb2_command) {536	case SMB2_SET_INFO:537	case SMB2_QUERY_INFO:538		*request_buf = cifs_buf_get();539		break;540	default:541		*request_buf = cifs_small_buf_get();542		break;543	}544	if (*request_buf == NULL) {545		/* BB should we add a retry in here if not a writepage? */546		return -ENOMEM;547	}548 549	fill_small_buf(smb2_command, tcon, server,550		       (struct smb2_hdr *)(*request_buf),551		       total_len);552 553	if (tcon != NULL) {554		uint16_t com_code = le16_to_cpu(smb2_command);555		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);556		cifs_stats_inc(&tcon->num_smbs_sent);557	}558 559	return 0;560}561 562static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,563			       struct TCP_Server_Info *server,564			       void **request_buf, unsigned int *total_len)565{566	int rc;567 568	rc = smb2_reconnect(smb2_command, tcon, server, false);569	if (rc)570		return rc;571 572	return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,573				     total_len);574}575 576static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,577			       struct TCP_Server_Info *server,578			       void **request_buf, unsigned int *total_len)579{580	/* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */581	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {582		return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,583					     request_buf, total_len);584	}585	return smb2_plain_req_init(SMB2_IOCTL, tcon, server,586				   request_buf, total_len);587}588 589/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */590 591static void592build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)593{594	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;595	pneg_ctxt->DataLength = cpu_to_le16(38);596	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);597	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);598	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);599	pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;600}601 602static void603build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)604{605	pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;606	pneg_ctxt->DataLength =607		cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)608			  - sizeof(struct smb2_neg_context));609	pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);610	pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;611	pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;612	pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;613}614 615static unsigned int616build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)617{618	unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);619	unsigned short num_algs = 1; /* number of signing algorithms sent */620 621	pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;622	/*623	 * Context Data length must be rounded to multiple of 8 for some servers624	 */625	pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -626					    sizeof(struct smb2_neg_context) +627					    (num_algs * sizeof(u16)), 8));628	pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);629	pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);630 631	ctxt_len += sizeof(__le16) * num_algs;632	ctxt_len = ALIGN(ctxt_len, 8);633	return ctxt_len;634	/* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */635}636 637static void638build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)639{640	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;641	if (require_gcm_256) {642		pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */643		pneg_ctxt->CipherCount = cpu_to_le16(1);644		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;645	} else if (enable_gcm_256) {646		pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */647		pneg_ctxt->CipherCount = cpu_to_le16(3);648		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;649		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;650		pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;651	} else {652		pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */653		pneg_ctxt->CipherCount = cpu_to_le16(2);654		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;655		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;656	}657}658 659static unsigned int660build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)661{662	struct nls_table *cp = load_nls_default();663 664	pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;665 666	/* copy up to max of first 100 bytes of server name to NetName field */667	pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));668	/* context size is DataLength + minimal smb2_neg_context */669	return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);670}671 672static void673build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)674{675	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;676	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);677	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */678	pneg_ctxt->Name[0] = 0x93;679	pneg_ctxt->Name[1] = 0xAD;680	pneg_ctxt->Name[2] = 0x25;681	pneg_ctxt->Name[3] = 0x50;682	pneg_ctxt->Name[4] = 0x9C;683	pneg_ctxt->Name[5] = 0xB4;684	pneg_ctxt->Name[6] = 0x11;685	pneg_ctxt->Name[7] = 0xE7;686	pneg_ctxt->Name[8] = 0xB4;687	pneg_ctxt->Name[9] = 0x23;688	pneg_ctxt->Name[10] = 0x83;689	pneg_ctxt->Name[11] = 0xDE;690	pneg_ctxt->Name[12] = 0x96;691	pneg_ctxt->Name[13] = 0x8B;692	pneg_ctxt->Name[14] = 0xCD;693	pneg_ctxt->Name[15] = 0x7C;694}695 696static void697assemble_neg_contexts(struct smb2_negotiate_req *req,698		      struct TCP_Server_Info *server, unsigned int *total_len)699{700	unsigned int ctxt_len, neg_context_count;701	struct TCP_Server_Info *pserver;702	char *pneg_ctxt;703	char *hostname;704 705	if (*total_len > 200) {706		/* In case length corrupted don't want to overrun smb buffer */707		cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");708		return;709	}710 711	/*712	 * round up total_len of fixed part of SMB3 negotiate request to 8713	 * byte boundary before adding negotiate contexts714	 */715	*total_len = ALIGN(*total_len, 8);716 717	pneg_ctxt = (*total_len) + (char *)req;718	req->NegotiateContextOffset = cpu_to_le32(*total_len);719 720	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);721	ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);722	*total_len += ctxt_len;723	pneg_ctxt += ctxt_len;724 725	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);726	ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);727	*total_len += ctxt_len;728	pneg_ctxt += ctxt_len;729 730	/*731	 * secondary channels don't have the hostname field populated732	 * use the hostname field in the primary channel instead733	 */734	pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;735	cifs_server_lock(pserver);736	hostname = pserver->hostname;737	if (hostname && (hostname[0] != 0)) {738		ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,739					      hostname);740		*total_len += ctxt_len;741		pneg_ctxt += ctxt_len;742		neg_context_count = 3;743	} else744		neg_context_count = 2;745	cifs_server_unlock(pserver);746 747	build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);748	*total_len += sizeof(struct smb2_posix_neg_context);749	pneg_ctxt += sizeof(struct smb2_posix_neg_context);750	neg_context_count++;751 752	if (server->compression.requested) {753		build_compression_ctxt((struct smb2_compression_capabilities_context *)754				pneg_ctxt);755		ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);756		*total_len += ctxt_len;757		pneg_ctxt += ctxt_len;758		neg_context_count++;759	}760 761	if (enable_negotiate_signing) {762		ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)763				pneg_ctxt);764		*total_len += ctxt_len;765		pneg_ctxt += ctxt_len;766		neg_context_count++;767	}768 769	/* check for and add transport_capabilities and signing capabilities */770	req->NegotiateContextCount = cpu_to_le16(neg_context_count);771 772}773 774/* If invalid preauth context warn but use what we requested, SHA-512 */775static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)776{777	unsigned int len = le16_to_cpu(ctxt->DataLength);778 779	/*780	 * Caller checked that DataLength remains within SMB boundary. We still781	 * need to confirm that one HashAlgorithms member is accounted for.782	 */783	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {784		pr_warn_once("server sent bad preauth context\n");785		return;786	} else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {787		pr_warn_once("server sent invalid SaltLength\n");788		return;789	}790	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)791		pr_warn_once("Invalid SMB3 hash algorithm count\n");792	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)793		pr_warn_once("unknown SMB3 hash algorithm\n");794}795 796static void decode_compress_ctx(struct TCP_Server_Info *server,797			 struct smb2_compression_capabilities_context *ctxt)798{799	unsigned int len = le16_to_cpu(ctxt->DataLength);800	__le16 alg;801 802	server->compression.enabled = false;803 804	/*805	 * Caller checked that DataLength remains within SMB boundary. We still806	 * need to confirm that one CompressionAlgorithms member is accounted807	 * for.808	 */809	if (len < 10) {810		pr_warn_once("server sent bad compression cntxt\n");811		return;812	}813 814	if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {815		pr_warn_once("invalid SMB3 compress algorithm count\n");816		return;817	}818 819	alg = ctxt->CompressionAlgorithms[0];820 821	/* 'NONE' (0) compressor type is never negotiated */822	if (alg == 0 || le16_to_cpu(alg) > 3) {823		pr_warn_once("invalid compression algorithm '%u'\n", alg);824		return;825	}826 827	server->compression.alg = alg;828	server->compression.enabled = true;829}830 831static int decode_encrypt_ctx(struct TCP_Server_Info *server,832			      struct smb2_encryption_neg_context *ctxt)833{834	unsigned int len = le16_to_cpu(ctxt->DataLength);835 836	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);837	/*838	 * Caller checked that DataLength remains within SMB boundary. We still839	 * need to confirm that one Cipher flexible array member is accounted840	 * for.841	 */842	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {843		pr_warn_once("server sent bad crypto ctxt len\n");844		return -EINVAL;845	}846 847	if (le16_to_cpu(ctxt->CipherCount) != 1) {848		pr_warn_once("Invalid SMB3.11 cipher count\n");849		return -EINVAL;850	}851	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));852	if (require_gcm_256) {853		if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {854			cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");855			return -EOPNOTSUPP;856		}857	} else if (ctxt->Ciphers[0] == 0) {858		/*859		 * e.g. if server only supported AES256_CCM (very unlikely)860		 * or server supported no encryption types or had all disabled.861		 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case862		 * in which mount requested encryption ("seal") checks later863		 * on during tree connection will return proper rc, but if864		 * seal not requested by client, since server is allowed to865		 * return 0 to indicate no supported cipher, we can't fail here866		 */867		server->cipher_type = 0;868		server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;869		pr_warn_once("Server does not support requested encryption types\n");870		return 0;871	} else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&872		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&873		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {874		/* server returned a cipher we didn't ask for */875		pr_warn_once("Invalid SMB3.11 cipher returned\n");876		return -EINVAL;877	}878	server->cipher_type = ctxt->Ciphers[0];879	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;880	return 0;881}882 883static void decode_signing_ctx(struct TCP_Server_Info *server,884			       struct smb2_signing_capabilities *pctxt)885{886	unsigned int len = le16_to_cpu(pctxt->DataLength);887 888	/*889	 * Caller checked that DataLength remains within SMB boundary. We still890	 * need to confirm that one SigningAlgorithms flexible array member is891	 * accounted for.892	 */893	if ((len < 4) || (len > 16)) {894		pr_warn_once("server sent bad signing negcontext\n");895		return;896	}897	if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {898		pr_warn_once("Invalid signing algorithm count\n");899		return;900	}901	if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {902		pr_warn_once("unknown signing algorithm\n");903		return;904	}905 906	server->signing_negotiated = true;907	server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);908	cifs_dbg(FYI, "signing algorithm %d chosen\n",909		     server->signing_algorithm);910}911 912 913static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,914				     struct TCP_Server_Info *server,915				     unsigned int len_of_smb)916{917	struct smb2_neg_context *pctx;918	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);919	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);920	unsigned int len_of_ctxts, i;921	int rc = 0;922 923	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);924	if (len_of_smb <= offset) {925		cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");926		return -EINVAL;927	}928 929	len_of_ctxts = len_of_smb - offset;930 931	for (i = 0; i < ctxt_cnt; i++) {932		int clen;933		/* check that offset is not beyond end of SMB */934		if (len_of_ctxts < sizeof(struct smb2_neg_context))935			break;936 937		pctx = (struct smb2_neg_context *)(offset + (char *)rsp);938		clen = sizeof(struct smb2_neg_context)939			+ le16_to_cpu(pctx->DataLength);940		/*941		 * 2.2.4 SMB2 NEGOTIATE Response942		 * Subsequent negotiate contexts MUST appear at the first 8-byte943		 * aligned offset following the previous negotiate context.944		 */945		if (i + 1 != ctxt_cnt)946			clen = ALIGN(clen, 8);947		if (clen > len_of_ctxts)948			break;949 950		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)951			decode_preauth_context(952				(struct smb2_preauth_neg_context *)pctx);953		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)954			rc = decode_encrypt_ctx(server,955				(struct smb2_encryption_neg_context *)pctx);956		else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)957			decode_compress_ctx(server,958				(struct smb2_compression_capabilities_context *)pctx);959		else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)960			server->posix_ext_supported = true;961		else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)962			decode_signing_ctx(server,963				(struct smb2_signing_capabilities *)pctx);964		else965			cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",966				le16_to_cpu(pctx->ContextType));967		if (rc)968			break;969 970		offset += clen;971		len_of_ctxts -= clen;972	}973	return rc;974}975 976static struct create_posix *977create_posix_buf(umode_t mode)978{979	struct create_posix *buf;980 981	buf = kzalloc(sizeof(struct create_posix),982			GFP_KERNEL);983	if (!buf)984		return NULL;985 986	buf->ccontext.DataOffset =987		cpu_to_le16(offsetof(struct create_posix, Mode));988	buf->ccontext.DataLength = cpu_to_le32(4);989	buf->ccontext.NameOffset =990		cpu_to_le16(offsetof(struct create_posix, Name));991	buf->ccontext.NameLength = cpu_to_le16(16);992 993	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */994	buf->Name[0] = 0x93;995	buf->Name[1] = 0xAD;996	buf->Name[2] = 0x25;997	buf->Name[3] = 0x50;998	buf->Name[4] = 0x9C;999	buf->Name[5] = 0xB4;1000	buf->Name[6] = 0x11;1001	buf->Name[7] = 0xE7;1002	buf->Name[8] = 0xB4;1003	buf->Name[9] = 0x23;1004	buf->Name[10] = 0x83;1005	buf->Name[11] = 0xDE;1006	buf->Name[12] = 0x96;1007	buf->Name[13] = 0x8B;1008	buf->Name[14] = 0xCD;1009	buf->Name[15] = 0x7C;1010	buf->Mode = cpu_to_le32(mode);1011	cifs_dbg(FYI, "mode on posix create 0%o\n", mode);1012	return buf;1013}1014 1015static int1016add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)1017{1018	unsigned int num = *num_iovec;1019 1020	iov[num].iov_base = create_posix_buf(mode);1021	if (mode == ACL_NO_MODE)1022		cifs_dbg(FYI, "%s: no mode\n", __func__);1023	if (iov[num].iov_base == NULL)1024		return -ENOMEM;1025	iov[num].iov_len = sizeof(struct create_posix);1026	*num_iovec = num + 1;1027	return 0;1028}1029 1030 1031/*1032 *1033 *	SMB2 Worker functions follow:1034 *1035 *	The general structure of the worker functions is:1036 *	1) Call smb2_init (assembles SMB2 header)1037 *	2) Initialize SMB2 command specific fields in fixed length area of SMB1038 *	3) Call smb_sendrcv2 (sends request on socket and waits for response)1039 *	4) Decode SMB2 command specific fields in the fixed length area1040 *	5) Decode variable length data area (if any for this SMB2 command type)1041 *	6) Call free smb buffer1042 *	7) return1043 *1044 */1045 1046int1047SMB2_negotiate(const unsigned int xid,1048	       struct cifs_ses *ses,1049	       struct TCP_Server_Info *server)1050{1051	struct smb_rqst rqst;1052	struct smb2_negotiate_req *req;1053	struct smb2_negotiate_rsp *rsp;1054	struct kvec iov[1];1055	struct kvec rsp_iov;1056	int rc;1057	int resp_buftype;1058	int blob_offset, blob_length;1059	char *security_blob;1060	int flags = CIFS_NEG_OP;1061	unsigned int total_len;1062 1063	cifs_dbg(FYI, "Negotiate protocol\n");1064 1065	if (!server) {1066		WARN(1, "%s: server is NULL!\n", __func__);1067		return -EIO;1068	}1069 1070	rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,1071				 (void **) &req, &total_len);1072	if (rc)1073		return rc;1074 1075	req->hdr.SessionId = 0;1076 1077	memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);1078	memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);1079 1080	if (strcmp(server->vals->version_string,1081		   SMB3ANY_VERSION_STRING) == 0) {1082		req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);1083		req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);1084		req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);1085		req->DialectCount = cpu_to_le16(3);1086		total_len += 6;1087	} else if (strcmp(server->vals->version_string,1088		   SMBDEFAULT_VERSION_STRING) == 0) {1089		req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);1090		req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);1091		req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);1092		req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);1093		req->DialectCount = cpu_to_le16(4);1094		total_len += 8;1095	} else {1096		/* otherwise send specific dialect */1097		req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);1098		req->DialectCount = cpu_to_le16(1);1099		total_len += 2;1100	}1101 1102	/* only one of SMB2 signing flags may be set in SMB2 request */1103	if (ses->sign)1104		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);1105	else if (global_secflags & CIFSSEC_MAY_SIGN)1106		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);1107	else1108		req->SecurityMode = 0;1109 1110	req->Capabilities = cpu_to_le32(server->vals->req_capabilities);1111	if (ses->chan_max > 1)1112		req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);1113 1114	/* ClientGUID must be zero for SMB2.02 dialect */1115	if (server->vals->protocol_id == SMB20_PROT_ID)1116		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);1117	else {1118		memcpy(req->ClientGUID, server->client_guid,1119			SMB2_CLIENT_GUID_SIZE);1120		if ((server->vals->protocol_id == SMB311_PROT_ID) ||1121		    (strcmp(server->vals->version_string,1122		     SMB3ANY_VERSION_STRING) == 0) ||1123		    (strcmp(server->vals->version_string,1124		     SMBDEFAULT_VERSION_STRING) == 0))1125			assemble_neg_contexts(req, server, &total_len);1126	}1127	iov[0].iov_base = (char *)req;1128	iov[0].iov_len = total_len;1129 1130	memset(&rqst, 0, sizeof(struct smb_rqst));1131	rqst.rq_iov = iov;1132	rqst.rq_nvec = 1;1133 1134	rc = cifs_send_recv(xid, ses, server,1135			    &rqst, &resp_buftype, flags, &rsp_iov);1136	cifs_small_buf_release(req);1137	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;1138	/*1139	 * No tcon so can't do1140	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);1141	 */1142	if (rc == -EOPNOTSUPP) {1143		cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");1144		goto neg_exit;1145	} else if (rc != 0)1146		goto neg_exit;1147 1148	rc = -EIO;1149	if (strcmp(server->vals->version_string,1150		   SMB3ANY_VERSION_STRING) == 0) {1151		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {1152			cifs_server_dbg(VFS,1153				"SMB2 dialect returned but not requested\n");1154			goto neg_exit;1155		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {1156			cifs_server_dbg(VFS,1157				"SMB2.1 dialect returned but not requested\n");1158			goto neg_exit;1159		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {1160			/* ops set to 3.0 by default for default so update */1161			server->ops = &smb311_operations;1162			server->vals = &smb311_values;1163		}1164	} else if (strcmp(server->vals->version_string,1165		   SMBDEFAULT_VERSION_STRING) == 0) {1166		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {1167			cifs_server_dbg(VFS,1168				"SMB2 dialect returned but not requested\n");1169			goto neg_exit;1170		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {1171			/* ops set to 3.0 by default for default so update */1172			server->ops = &smb21_operations;1173			server->vals = &smb21_values;1174		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {1175			server->ops = &smb311_operations;1176			server->vals = &smb311_values;1177		}1178	} else if (le16_to_cpu(rsp->DialectRevision) !=1179				server->vals->protocol_id) {1180		/* if requested single dialect ensure returned dialect matched */1181		cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",1182				le16_to_cpu(rsp->DialectRevision));1183		goto neg_exit;1184	}1185 1186	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);1187 1188	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))1189		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");1190	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))1191		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");1192	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))1193		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");1194	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))1195		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");1196	else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))1197		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");1198	else {1199		cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",1200				le16_to_cpu(rsp->DialectRevision));1201		goto neg_exit;1202	}1203 1204	rc = 0;1205	server->dialect = le16_to_cpu(rsp->DialectRevision);1206 1207	/*1208	 * Keep a copy of the hash after negprot. This hash will be1209	 * the starting hash value for all sessions made from this1210	 * server.1211	 */1212	memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,1213	       SMB2_PREAUTH_HASH_SIZE);1214 1215	/* SMB2 only has an extended negflavor */1216	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;1217	/* set it to the maximum buffer size value we can send with 1 credit */1218	server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),1219			       SMB2_MAX_BUFFER_SIZE);1220	server->max_read = le32_to_cpu(rsp->MaxReadSize);1221	server->max_write = le32_to_cpu(rsp->MaxWriteSize);1222	server->sec_mode = le16_to_cpu(rsp->SecurityMode);1223	if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)1224		cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",1225				server->sec_mode);1226	server->capabilities = le32_to_cpu(rsp->Capabilities);1227	/* Internal types */1228	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;1229 1230	/*1231	 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context1232	 * Set the cipher type manually.1233	 */1234	if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))1235		server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;1236 1237	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,1238					       (struct smb2_hdr *)rsp);1239	/*1240	 * See MS-SMB2 section 2.2.4: if no blob, client picks default which1241	 * for us will be1242	 *	ses->sectype = RawNTLMSSP;1243	 * but for time being this is our only auth choice so doesn't matter.1244	 * We just found a server which sets blob length to zero expecting raw.1245	 */1246	if (blob_length == 0) {1247		cifs_dbg(FYI, "missing security blob on negprot\n");1248		server->sec_ntlmssp = true;1249	}1250 1251	rc = cifs_enable_signing(server, ses->sign);1252	if (rc)1253		goto neg_exit;1254	if (blob_length) {1255		rc = decode_negTokenInit(security_blob, blob_length, server);1256		if (rc == 1)1257			rc = 0;1258		else if (rc == 0)1259			rc = -EIO;1260	}1261 1262	if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {1263		if (rsp->NegotiateContextCount)1264			rc = smb311_decode_neg_context(rsp, server,1265						       rsp_iov.iov_len);1266		else1267			cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");1268	}1269 1270	if (server->cipher_type && !rc) {1271		if (!SERVER_IS_CHAN(server)) {1272			rc = smb3_crypto_aead_allocate(server);1273		} else {1274			/* For channels, just reuse the primary server crypto secmech. */1275			server->secmech.enc = server->primary_server->secmech.enc;1276			server->secmech.dec = server->primary_server->secmech.dec;1277		}1278	}1279neg_exit:1280	free_rsp_buf(resp_buftype, rsp);1281	return rc;1282}1283 1284int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)1285{1286	int rc;1287	struct validate_negotiate_info_req *pneg_inbuf;1288	struct validate_negotiate_info_rsp *pneg_rsp = NULL;1289	u32 rsplen;1290	u32 inbuflen; /* max of 4 dialects */1291	struct TCP_Server_Info *server = tcon->ses->server;1292 1293	cifs_dbg(FYI, "validate negotiate\n");1294 1295	/* In SMB3.11 preauth integrity supersedes validate negotiate */1296	if (server->dialect == SMB311_PROT_ID)1297		return 0;1298 1299	/*1300	 * validation ioctl must be signed, so no point sending this if we1301	 * can not sign it (ie are not known user).  Even if signing is not1302	 * required (enabled but not negotiated), in those cases we selectively1303	 * sign just this, the first and only signed request on a connection.1304	 * Having validation of negotiate info  helps reduce attack vectors.1305	 */1306	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)1307		return 0; /* validation requires signing */1308 1309	if (tcon->ses->user_name == NULL) {1310		cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");1311		return 0; /* validation requires signing */1312	}1313 1314	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)1315		cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");1316 1317	pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);1318	if (!pneg_inbuf)1319		return -ENOMEM;1320 1321	pneg_inbuf->Capabilities =1322			cpu_to_le32(server->vals->req_capabilities);1323	if (tcon->ses->chan_max > 1)1324		pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);1325 1326	memcpy(pneg_inbuf->Guid, server->client_guid,1327					SMB2_CLIENT_GUID_SIZE);1328 1329	if (tcon->ses->sign)1330		pneg_inbuf->SecurityMode =1331			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);1332	else if (global_secflags & CIFSSEC_MAY_SIGN)1333		pneg_inbuf->SecurityMode =1334			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);1335	else1336		pneg_inbuf->SecurityMode = 0;1337 1338 1339	if (strcmp(server->vals->version_string,1340		SMB3ANY_VERSION_STRING) == 0) {1341		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);1342		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);1343		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);1344		pneg_inbuf->DialectCount = cpu_to_le16(3);1345		/* SMB 2.1 not included so subtract one dialect from len */1346		inbuflen = sizeof(*pneg_inbuf) -1347				(sizeof(pneg_inbuf->Dialects[0]));1348	} else if (strcmp(server->vals->version_string,1349		SMBDEFAULT_VERSION_STRING) == 0) {1350		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);1351		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);1352		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);1353		pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);1354		pneg_inbuf->DialectCount = cpu_to_le16(4);1355		/* structure is big enough for 4 dialects */1356		inbuflen = sizeof(*pneg_inbuf);1357	} else {1358		/* otherwise specific dialect was requested */1359		pneg_inbuf->Dialects[0] =1360			cpu_to_le16(server->vals->protocol_id);1361		pneg_inbuf->DialectCount = cpu_to_le16(1);1362		/* structure is big enough for 4 dialects, sending only 1 */1363		inbuflen = sizeof(*pneg_inbuf) -1364				sizeof(pneg_inbuf->Dialects[0]) * 3;1365	}1366 1367	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,1368		FSCTL_VALIDATE_NEGOTIATE_INFO,1369		(char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,1370		(char **)&pneg_rsp, &rsplen);1371	if (rc == -EOPNOTSUPP) {1372		/*1373		 * Old Windows versions or Netapp SMB server can return1374		 * not supported error. Client should accept it.1375		 */1376		cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");1377		rc = 0;1378		goto out_free_inbuf;1379	} else if (rc != 0) {1380		cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",1381			      rc);1382		rc = -EIO;1383		goto out_free_inbuf;1384	}1385 1386	rc = -EIO;1387	if (rsplen != sizeof(*pneg_rsp)) {1388		cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",1389			      rsplen);1390 1391		/* relax check since Mac returns max bufsize allowed on ioctl */1392		if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))1393			goto out_free_rsp;1394	}1395 1396	/* check validate negotiate info response matches what we got earlier */1397	if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))1398		goto vneg_out;1399 1400	if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))1401		goto vneg_out;1402 1403	/* do not validate server guid because not saved at negprot time yet */1404 1405	if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |1406	      SMB2_LARGE_FILES) != server->capabilities)1407		goto vneg_out;1408 1409	/* validate negotiate successful */1410	rc = 0;1411	cifs_dbg(FYI, "validate negotiate info successful\n");1412	goto out_free_rsp;1413 1414vneg_out:1415	cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");1416out_free_rsp:1417	kfree(pneg_rsp);1418out_free_inbuf:1419	kfree(pneg_inbuf);1420	return rc;1421}1422 1423enum securityEnum1424smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)1425{1426	switch (requested) {1427	case Kerberos:1428	case RawNTLMSSP:1429		return requested;1430	case NTLMv2:1431		return RawNTLMSSP;1432	case Unspecified:1433		if (server->sec_ntlmssp &&1434			(global_secflags & CIFSSEC_MAY_NTLMSSP))1435			return RawNTLMSSP;1436		if ((server->sec_kerberos || server->sec_mskerberos) &&1437			(global_secflags & CIFSSEC_MAY_KRB5))1438			return Kerberos;1439		fallthrough;1440	default:1441		return Unspecified;1442	}1443}1444 1445struct SMB2_sess_data {1446	unsigned int xid;1447	struct cifs_ses *ses;1448	struct TCP_Server_Info *server;1449	struct nls_table *nls_cp;1450	void (*func)(struct SMB2_sess_data *);1451	int result;1452	u64 previous_session;1453 1454	/* we will send the SMB in three pieces:1455	 * a fixed length beginning part, an optional1456	 * SPNEGO blob (which can be zero length), and a1457	 * last part which will include the strings1458	 * and rest of bcc area. This allows us to avoid1459	 * a large buffer 17K allocation1460	 */1461	int buf0_type;1462	struct kvec iov[2];1463};1464 1465static int1466SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)1467{1468	int rc;1469	struct cifs_ses *ses = sess_data->ses;1470	struct TCP_Server_Info *server = sess_data->server;1471	struct smb2_sess_setup_req *req;1472	unsigned int total_len;1473	bool is_binding = false;1474 1475	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,1476				 (void **) &req,1477				 &total_len);1478	if (rc)1479		return rc;1480 1481	spin_lock(&ses->ses_lock);1482	is_binding = (ses->ses_status == SES_GOOD);1483	spin_unlock(&ses->ses_lock);1484 1485	if (is_binding) {1486		req->hdr.SessionId = cpu_to_le64(ses->Suid);1487		req->hdr.Flags |= SMB2_FLAGS_SIGNED;1488		req->PreviousSessionId = 0;1489		req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;1490		cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);1491	} else {1492		/* First session, not a reauthenticate */1493		req->hdr.SessionId = 0;1494		/*1495		 * if reconnect, we need to send previous sess id1496		 * otherwise it is 01497		 */1498		req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);1499		req->Flags = 0; /* MBZ */1500		cifs_dbg(FYI, "Fresh session. Previous: %llx\n",1501			 sess_data->previous_session);1502	}1503 1504	/* enough to enable echos and oplocks and one max size write */1505	if (server->credits >= server->max_credits)1506		req->hdr.CreditRequest = cpu_to_le16(0);1507	else1508		req->hdr.CreditRequest = cpu_to_le16(1509			min_t(int, server->max_credits -1510			      server->credits, 130));1511 1512	/* only one of SMB2 signing flags may be set in SMB2 request */1513	if (server->sign)1514		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;1515	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */1516		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;1517	else1518		req->SecurityMode = 0;1519 1520#ifdef CONFIG_CIFS_DFS_UPCALL1521	req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);1522#else1523	req->Capabilities = 0;1524#endif /* DFS_UPCALL */1525 1526	req->Channel = 0; /* MBZ */1527 1528	sess_data->iov[0].iov_base = (char *)req;1529	/* 1 for pad */1530	sess_data->iov[0].iov_len = total_len - 1;1531	/*1532	 * This variable will be used to clear the buffer1533	 * allocated above in case of any error in the calling function.1534	 */1535	sess_data->buf0_type = CIFS_SMALL_BUFFER;1536 1537	return 0;1538}1539 1540static void1541SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)1542{1543	struct kvec *iov = sess_data->iov;1544 1545	/* iov[1] is already freed by caller */1546	if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)1547		memzero_explicit(iov[0].iov_base, iov[0].iov_len);1548 1549	free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);1550	sess_data->buf0_type = CIFS_NO_BUFFER;1551}1552 1553static int1554SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)1555{1556	int rc;1557	struct smb_rqst rqst;1558	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;1559	struct kvec rsp_iov = { NULL, 0 };1560 1561	/* Testing shows that buffer offset must be at location of Buffer[0] */1562	req->SecurityBufferOffset =1563		cpu_to_le16(sizeof(struct smb2_sess_setup_req));1564	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);1565 1566	memset(&rqst, 0, sizeof(struct smb_rqst));1567	rqst.rq_iov = sess_data->iov;1568	rqst.rq_nvec = 2;1569 1570	/* BB add code to build os and lm fields */1571	rc = cifs_send_recv(sess_data->xid, sess_data->ses,1572			    sess_data->server,1573			    &rqst,1574			    &sess_data->buf0_type,1575			    CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);1576	cifs_small_buf_release(sess_data->iov[0].iov_base);1577	if (rc == 0)1578		sess_data->ses->expired_pwd = false;1579	else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {1580		if (sess_data->ses->expired_pwd == false)1581			trace_smb3_key_expired(sess_data->server->hostname,1582					       sess_data->ses->user_name,1583					       sess_data->server->conn_id,1584					       &sess_data->server->dstaddr, rc);1585		sess_data->ses->expired_pwd = true;1586	}1587 1588	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));1589 1590	return rc;1591}1592 1593static int1594SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)1595{1596	int rc = 0;1597	struct cifs_ses *ses = sess_data->ses;1598	struct TCP_Server_Info *server = sess_data->server;1599 1600	cifs_server_lock(server);1601	if (server->ops->generate_signingkey) {1602		rc = server->ops->generate_signingkey(ses, server);1603		if (rc) {1604			cifs_dbg(FYI,1605				"SMB3 session key generation failed\n");1606			cifs_server_unlock(server);1607			return rc;1608		}1609	}1610	if (!server->session_estab) {1611		server->sequence_number = 0x2;1612		server->session_estab = true;1613	}1614	cifs_server_unlock(server);1615 1616	cifs_dbg(FYI, "SMB2/3 session established successfully\n");1617	return rc;1618}1619 1620#ifdef CONFIG_CIFS_UPCALL1621static void1622SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)1623{1624	int rc;1625	struct cifs_ses *ses = sess_data->ses;1626	struct TCP_Server_Info *server = sess_data->server;1627	struct cifs_spnego_msg *msg;1628	struct key *spnego_key = NULL;1629	struct smb2_sess_setup_rsp *rsp = NULL;1630	bool is_binding = false;1631 1632	rc = SMB2_sess_alloc_buffer(sess_data);1633	if (rc)1634		goto out;1635 1636	spnego_key = cifs_get_spnego_key(ses, server);1637	if (IS_ERR(spnego_key)) {1638		rc = PTR_ERR(spnego_key);1639		if (rc == -ENOKEY)1640			cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");1641		spnego_key = NULL;1642		goto out;1643	}1644 1645	msg = spnego_key->payload.data[0];1646	/*1647	 * check version field to make sure that cifs.upcall is1648	 * sending us a response in an expected form1649	 */1650	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {1651		cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",1652			 CIFS_SPNEGO_UPCALL_VERSION, msg->version);1653		rc = -EKEYREJECTED;1654		goto out_put_spnego_key;1655	}1656 1657	spin_lock(&ses->ses_lock);1658	is_binding = (ses->ses_status == SES_GOOD);1659	spin_unlock(&ses->ses_lock);1660 1661	/* keep session key if binding */1662	if (!is_binding) {1663		kfree_sensitive(ses->auth_key.response);1664		ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,1665						 GFP_KERNEL);1666		if (!ses->auth_key.response) {1667			cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",1668				 msg->sesskey_len);1669			rc = -ENOMEM;1670			goto out_put_spnego_key;1671		}1672		ses->auth_key.len = msg->sesskey_len;1673	}1674 1675	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;1676	sess_data->iov[1].iov_len = msg->secblob_len;1677 1678	rc = SMB2_sess_sendreceive(sess_data);1679	if (rc)1680		goto out_put_spnego_key;1681 1682	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;1683	/* keep session id and flags if binding */1684	if (!is_binding) {1685		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);1686		ses->session_flags = le16_to_cpu(rsp->SessionFlags);1687	}1688 1689	rc = SMB2_sess_establish_session(sess_data);1690out_put_spnego_key:1691	key_invalidate(spnego_key);1692	key_put(spnego_key);1693	if (rc) {1694		kfree_sensitive(ses->auth_key.response);1695		ses->auth_key.response = NULL;1696		ses->auth_key.len = 0;1697	}1698out:1699	sess_data->result = rc;1700	sess_data->func = NULL;1701	SMB2_sess_free_buffer(sess_data);1702}1703#else1704static void1705SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)1706{1707	cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");1708	sess_data->result = -EOPNOTSUPP;1709	sess_data->func = NULL;1710}1711#endif1712 1713static void1714SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);1715 1716static void1717SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)1718{1719	int rc;1720	struct cifs_ses *ses = sess_data->ses;1721	struct TCP_Server_Info *server = sess_data->server;1722	struct smb2_sess_setup_rsp *rsp = NULL;1723	unsigned char *ntlmssp_blob = NULL;1724	bool use_spnego = false; /* else use raw ntlmssp */1725	u16 blob_length = 0;1726	bool is_binding = false;1727 1728	/*1729	 * If memory allocation is successful, caller of this function1730	 * frees it.1731	 */1732	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);1733	if (!ses->ntlmssp) {1734		rc = -ENOMEM;1735		goto out_err;1736	}1737	ses->ntlmssp->sesskey_per_smbsess = true;1738 1739	rc = SMB2_sess_alloc_buffer(sess_data);1740	if (rc)1741		goto out_err;1742 1743	rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,1744					  &blob_length, ses, server,1745					  sess_data->nls_cp);1746	if (rc)1747		goto out;1748 1749	if (use_spnego) {1750		/* BB eventually need to add this */1751		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");1752		rc = -EOPNOTSUPP;1753		goto out;1754	}1755	sess_data->iov[1].iov_base = ntlmssp_blob;1756	sess_data->iov[1].iov_len = blob_length;1757 1758	rc = SMB2_sess_sendreceive(sess_data);1759	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;1760 1761	/* If true, rc here is expected and not an error */1762	if (sess_data->buf0_type != CIFS_NO_BUFFER &&1763		rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)1764		rc = 0;1765 1766	if (rc)1767		goto out;1768 1769	if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=1770			le16_to_cpu(rsp->SecurityBufferOffset)) {1771		cifs_dbg(VFS, "Invalid security buffer offset %d\n",1772			le16_to_cpu(rsp->SecurityBufferOffset));1773		rc = -EIO;1774		goto out;1775	}1776	rc = decode_ntlmssp_challenge(rsp->Buffer,1777			le16_to_cpu(rsp->SecurityBufferLength), ses);1778	if (rc)1779		goto out;1780 1781	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");1782 1783	spin_lock(&ses->ses_lock);1784	is_binding = (ses->ses_status == SES_GOOD);1785	spin_unlock(&ses->ses_lock);1786 1787	/* keep existing ses id and flags if binding */1788	if (!is_binding) {1789		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);1790		ses->session_flags = le16_to_cpu(rsp->SessionFlags);1791	}1792 1793out:1794	kfree_sensitive(ntlmssp_blob);1795	SMB2_sess_free_buffer(sess_data);1796	if (!rc) {1797		sess_data->result = 0;1798		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;1799		return;1800	}1801out_err:1802	kfree_sensitive(ses->ntlmssp);1803	ses->ntlmssp = NULL;1804	sess_data->result = rc;1805	sess_data->func = NULL;1806}1807 1808static void1809SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)1810{1811	int rc;1812	struct cifs_ses *ses = sess_data->ses;1813	struct TCP_Server_Info *server = sess_data->server;1814	struct smb2_sess_setup_req *req;1815	struct smb2_sess_setup_rsp *rsp = NULL;1816	unsigned char *ntlmssp_blob = NULL;1817	bool use_spnego = false; /* else use raw ntlmssp */1818	u16 blob_length = 0;1819	bool is_binding = false;1820 1821	rc = SMB2_sess_alloc_buffer(sess_data);1822	if (rc)1823		goto out;1824 1825	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;1826	req->hdr.SessionId = cpu_to_le64(ses->Suid);1827 1828	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,1829				     ses, server,1830				     sess_data->nls_cp);1831	if (rc) {1832		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);1833		goto out;1834	}1835 1836	if (use_spnego) {1837		/* BB eventually need to add this */1838		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");1839		rc = -EOPNOTSUPP;1840		goto out;1841	}1842	sess_data->iov[1].iov_base = ntlmssp_blob;1843	sess_data->iov[1].iov_len = blob_length;1844 1845	rc = SMB2_sess_sendreceive(sess_data);1846	if (rc)1847		goto out;1848 1849	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;1850 1851	spin_lock(&ses->ses_lock);1852	is_binding = (ses->ses_status == SES_GOOD);1853	spin_unlock(&ses->ses_lock);1854 1855	/* keep existing ses id and flags if binding */1856	if (!is_binding) {1857		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);1858		ses->session_flags = le16_to_cpu(rsp->SessionFlags);1859	}1860 1861	rc = SMB2_sess_establish_session(sess_data);1862#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS1863	if (ses->server->dialect < SMB30_PROT_ID) {1864		cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);1865		/*1866		 * The session id is opaque in terms of endianness, so we can't1867		 * print it as a long long. we dump it as we got it on the wire1868		 */1869		cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),1870			 &ses->Suid);1871		cifs_dbg(VFS, "Session Key   %*ph\n",1872			 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);1873		cifs_dbg(VFS, "Signing Key   %*ph\n",1874			 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);1875	}1876#endif1877out:1878	kfree_sensitive(ntlmssp_blob);1879	SMB2_sess_free_buffer(sess_data);1880	kfree_sensitive(ses->ntlmssp);1881	ses->ntlmssp = NULL;1882	sess_data->result = rc;1883	sess_data->func = NULL;1884}1885 1886static int1887SMB2_select_sec(struct SMB2_sess_data *sess_data)1888{1889	int type;1890	struct cifs_ses *ses = sess_data->ses;1891	struct TCP_Server_Info *server = sess_data->server;1892 1893	type = smb2_select_sectype(server, ses->sectype);1894	cifs_dbg(FYI, "sess setup type %d\n", type);1895	if (type == Unspecified) {1896		cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");1897		return -EINVAL;1898	}1899 1900	switch (type) {1901	case Kerberos:1902		sess_data->func = SMB2_auth_kerberos;1903		break;1904	case RawNTLMSSP:1905		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;1906		break;1907	default:1908		cifs_dbg(VFS, "secType %d not supported!\n", type);1909		return -EOPNOTSUPP;1910	}1911 1912	return 0;1913}1914 1915int1916SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,1917		struct TCP_Server_Info *server,1918		const struct nls_table *nls_cp)1919{1920	int rc = 0;1921	struct SMB2_sess_data *sess_data;1922 1923	cifs_dbg(FYI, "Session Setup\n");1924 1925	if (!server) {1926		WARN(1, "%s: server is NULL!\n", __func__);1927		return -EIO;1928	}1929 1930	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);1931	if (!sess_data)1932		return -ENOMEM;1933 1934	sess_data->xid = xid;1935	sess_data->ses = ses;1936	sess_data->server = server;1937	sess_data->buf0_type = CIFS_NO_BUFFER;1938	sess_data->nls_cp = (struct nls_table *) nls_cp;1939	sess_data->previous_session = ses->Suid;1940 1941	rc = SMB2_select_sec(sess_data);1942	if (rc)1943		goto out;1944 1945	/*1946	 * Initialize the session hash with the server one.1947	 */1948	memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,1949	       SMB2_PREAUTH_HASH_SIZE);1950 1951	while (sess_data->func)1952		sess_data->func(sess_data);1953 1954	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))1955		cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");1956	rc = sess_data->result;1957out:1958	kfree_sensitive(sess_data);1959	return rc;1960}1961 1962int1963SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)1964{1965	struct smb_rqst rqst;1966	struct smb2_logoff_req *req; /* response is also trivial struct */1967	int rc = 0;1968	struct TCP_Server_Info *server;1969	int flags = 0;1970	unsigned int total_len;1971	struct kvec iov[1];1972	struct kvec rsp_iov;1973	int resp_buf_type;1974 1975	cifs_dbg(FYI, "disconnect session %p\n", ses);1976 1977	if (ses && (ses->server))1978		server = ses->server;1979	else1980		return -EIO;1981 1982	/* no need to send SMB logoff if uid already closed due to reconnect */1983	spin_lock(&ses->chan_lock);1984	if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {1985		spin_unlock(&ses->chan_lock);1986		goto smb2_session_already_dead;1987	}1988	spin_unlock(&ses->chan_lock);1989 1990	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,1991				 (void **) &req, &total_len);1992	if (rc)1993		return rc;1994 1995	 /* since no tcon, smb2_init can not do this, so do here */1996	req->hdr.SessionId = cpu_to_le64(ses->Suid);1997 1998	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)1999		flags |= CIFS_TRANSFORM_REQ;2000	else if (server->sign)2001		req->hdr.Flags |= SMB2_FLAGS_SIGNED;2002 2003	flags |= CIFS_NO_RSP_BUF;2004 2005	iov[0].iov_base = (char *)req;2006	iov[0].iov_len = total_len;2007 2008	memset(&rqst, 0, sizeof(struct smb_rqst));2009	rqst.rq_iov = iov;2010	rqst.rq_nvec = 1;2011 2012	rc = cifs_send_recv(xid, ses, ses->server,2013			    &rqst, &resp_buf_type, flags, &rsp_iov);2014	cifs_small_buf_release(req);2015	/*2016	 * No tcon so can't do2017	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);2018	 */2019 2020smb2_session_already_dead:2021	return rc;2022}2023 2024static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)2025{2026	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);2027}2028 2029#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)2030 2031/* These are similar values to what Windows uses */2032static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)2033{2034	tcon->max_chunks = 256;2035	tcon->max_bytes_chunk = 1048576;2036	tcon->max_bytes_copy = 16777216;2037}2038 2039int2040SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,2041	  struct cifs_tcon *tcon, const struct nls_table *cp)2042{2043	struct smb_rqst rqst;2044	struct smb2_tree_connect_req *req;2045	struct smb2_tree_connect_rsp *rsp = NULL;2046	struct kvec iov[2];2047	struct kvec rsp_iov = { NULL, 0 };2048	int rc = 0;2049	int resp_buftype;2050	int unc_path_len;2051	__le16 *unc_path = NULL;2052	int flags = 0;2053	unsigned int total_len;2054	struct TCP_Server_Info *server = cifs_pick_channel(ses);2055 2056	cifs_dbg(FYI, "TCON\n");2057 2058	if (!server || !tree)2059		return -EIO;2060 2061	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);2062	if (unc_path == NULL)2063		return -ENOMEM;2064 2065	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);2066	if (unc_path_len <= 0) {2067		kfree(unc_path);2068		return -EINVAL;2069	}2070	unc_path_len *= 2;2071 2072	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */2073	tcon->tid = 0;2074	atomic_set(&tcon->num_remote_opens, 0);2075	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,2076				 (void **) &req, &total_len);2077	if (rc) {2078		kfree(unc_path);2079		return rc;2080	}2081 2082	if (smb3_encryption_required(tcon))2083		flags |= CIFS_TRANSFORM_REQ;2084 2085	iov[0].iov_base = (char *)req;2086	/* 1 for pad */2087	iov[0].iov_len = total_len - 1;2088 2089	/* Testing shows that buffer offset must be at location of Buffer[0] */2090	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));2091	req->PathLength = cpu_to_le16(unc_path_len);2092	iov[1].iov_base = unc_path;2093	iov[1].iov_len = unc_path_len;2094 2095	/*2096	 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.12097	 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.12098	 * (Samba servers don't always set the flag so also check if null user)2099	 */2100	if ((server->dialect == SMB311_PROT_ID) &&2101	    !smb3_encryption_required(tcon) &&2102	    !(ses->session_flags &2103		    (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&2104	    ((ses->user_name != NULL) || (ses->sectype == Kerberos)))2105		req->hdr.Flags |= SMB2_FLAGS_SIGNED;2106 2107	memset(&rqst, 0, sizeof(struct smb_rqst));2108	rqst.rq_iov = iov;2109	rqst.rq_nvec = 2;2110 2111	/* Need 64 for max size write so ask for more in case not there yet */2112	if (server->credits >= server->max_credits)2113		req->hdr.CreditRequest = cpu_to_le16(0);2114	else2115		req->hdr.CreditRequest = cpu_to_le16(2116			min_t(int, server->max_credits -2117			      server->credits, 64));2118 2119	rc = cifs_send_recv(xid, ses, server,2120			    &rqst, &resp_buftype, flags, &rsp_iov);2121	cifs_small_buf_release(req);2122	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;2123	trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);2124	if ((rc != 0) || (rsp == NULL)) {2125		cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);2126		tcon->need_reconnect = true;2127		goto tcon_error_exit;2128	}2129 2130	switch (rsp->ShareType) {2131	case SMB2_SHARE_TYPE_DISK:2132		cifs_dbg(FYI, "connection to disk share\n");2133		break;2134	case SMB2_SHARE_TYPE_PIPE:2135		tcon->pipe = true;2136		cifs_dbg(FYI, "connection to pipe share\n");2137		break;2138	case SMB2_SHARE_TYPE_PRINT:2139		tcon->print = true;2140		cifs_dbg(FYI, "connection to printer\n");2141		break;2142	default:2143		cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);2144		rc = -EOPNOTSUPP;2145		goto tcon_error_exit;2146	}2147 2148	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);2149	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */2150	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);2151	tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);2152	strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));2153 2154	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&2155	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))2156		cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");2157 2158	if (tcon->seal &&2159	    !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))2160		cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");2161 2162	init_copy_chunk_defaults(tcon);2163	if (server->ops->validate_negotiate)2164		rc = server->ops->validate_negotiate(xid, tcon);2165	if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */2166		if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)2167			server->nosharesock = true;2168tcon_exit:2169 2170	free_rsp_buf(resp_buftype, rsp);2171	kfree(unc_path);2172	return rc;2173 2174tcon_error_exit:2175	if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)2176		cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);2177	goto tcon_exit;2178}2179 2180int2181SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)2182{2183	struct smb_rqst rqst;2184	struct smb2_tree_disconnect_req *req; /* response is trivial */2185	int rc = 0;2186	struct cifs_ses *ses = tcon->ses;2187	struct TCP_Server_Info *server = cifs_pick_channel(ses);2188	int flags = 0;2189	unsigned int total_len;2190	struct kvec iov[1];2191	struct kvec rsp_iov;2192	int resp_buf_type;2193 2194	cifs_dbg(FYI, "Tree Disconnect\n");2195 2196	if (!ses || !(ses->server))2197		return -EIO;2198 2199	trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);2200	spin_lock(&ses->chan_lock);2201	if ((tcon->need_reconnect) ||2202	    (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {2203		spin_unlock(&ses->chan_lock);2204		return 0;2205	}2206	spin_unlock(&ses->chan_lock);2207 2208	invalidate_all_cached_dirs(tcon);2209 2210	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,2211				 (void **) &req,2212				 &total_len);2213	if (rc)2214		return rc;2215 2216	if (smb3_encryption_required(tcon))2217		flags |= CIFS_TRANSFORM_REQ;2218 2219	flags |= CIFS_NO_RSP_BUF;2220 2221	iov[0].iov_base = (char *)req;2222	iov[0].iov_len = total_len;2223 2224	memset(&rqst, 0, sizeof(struct smb_rqst));2225	rqst.rq_iov = iov;2226	rqst.rq_nvec = 1;2227 2228	rc = cifs_send_recv(xid, ses, server,2229			    &rqst, &resp_buf_type, flags, &rsp_iov);2230	cifs_small_buf_release(req);2231	if (rc) {2232		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);2233		trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);2234	}2235	trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);2236 2237	return rc;2238}2239 2240 2241static struct create_durable *2242create_durable_buf(void)2243{2244	struct create_durable *buf;2245 2246	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);2247	if (!buf)2248		return NULL;2249 2250	buf->ccontext.DataOffset = cpu_to_le16(offsetof2251					(struct create_durable, Data));2252	buf->ccontext.DataLength = cpu_to_le32(16);2253	buf->ccontext.NameOffset = cpu_to_le16(offsetof2254				(struct create_durable, Name));2255	buf->ccontext.NameLength = cpu_to_le16(4);2256	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */2257	buf->Name[0] = 'D';2258	buf->Name[1] = 'H';2259	buf->Name[2] = 'n';2260	buf->Name[3] = 'Q';2261	return buf;2262}2263 2264static struct create_durable *2265create_reconnect_durable_buf(struct cifs_fid *fid)2266{2267	struct create_durable *buf;2268 2269	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);2270	if (!buf)2271		return NULL;2272 2273	buf->ccontext.DataOffset = cpu_to_le16(offsetof2274					(struct create_durable, Data));2275	buf->ccontext.DataLength = cpu_to_le32(16);2276	buf->ccontext.NameOffset = cpu_to_le16(offsetof2277				(struct create_durable, Name));2278	buf->ccontext.NameLength = cpu_to_le16(4);2279	buf->Data.Fid.PersistentFileId = fid->persistent_fid;2280	buf->Data.Fid.VolatileFileId = fid->volatile_fid;2281	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */2282	buf->Name[0] = 'D';2283	buf->Name[1] = 'H';2284	buf->Name[2] = 'n';2285	buf->Name[3] = 'C';2286	return buf;2287}2288 2289static void2290parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)2291{2292	struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;2293 2294	cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",2295		pdisk_id->DiskFileId, pdisk_id->VolumeId);2296	buf->IndexNumber = pdisk_id->DiskFileId;2297}2298 2299static void2300parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,2301		 struct create_posix_rsp *posix)2302{2303	int sid_len;2304	u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);2305	u8 *end = beg + le32_to_cpu(cc->DataLength);2306	u8 *sid;2307 2308	memset(posix, 0, sizeof(*posix));2309 2310	posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));2311	posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));2312	posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));2313 2314	sid = beg + 12;2315	sid_len = posix_info_sid_size(sid, end);2316	if (sid_len < 0) {2317		cifs_dbg(VFS, "bad owner sid in posix create response\n");2318		return;2319	}2320	memcpy(&posix->owner, sid, sid_len);2321 2322	sid = sid + sid_len;2323	sid_len = posix_info_sid_size(sid, end);2324	if (sid_len < 0) {2325		cifs_dbg(VFS, "bad group sid in posix create response\n");2326		return;2327	}2328	memcpy(&posix->group, sid, sid_len);2329 2330	cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",2331		 posix->nlink, posix->mode, posix->reparse_tag);2332}2333 2334int smb2_parse_contexts(struct TCP_Server_Info *server,2335			struct kvec *rsp_iov,2336			unsigned int *epoch,2337			char *lease_key, __u8 *oplock,2338			struct smb2_file_all_info *buf,2339			struct create_posix_rsp *posix)2340{2341	struct smb2_create_rsp *rsp = rsp_iov->iov_base;2342	struct create_context *cc;2343	size_t rem, off, len;2344	size_t doff, dlen;2345	size_t noff, nlen;2346	char *name;2347	static const char smb3_create_tag_posix[] = {2348		0x93, 0xAD, 0x25, 0x50, 0x9C,2349		0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,2350		0xDE, 0x96, 0x8B, 0xCD, 0x7C2351	};2352 2353	*oplock = 0;2354 2355	off = le32_to_cpu(rsp->CreateContextsOffset);2356	rem = le32_to_cpu(rsp->CreateContextsLength);2357	if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)2358		return -EINVAL;2359	cc = (struct create_context *)((u8 *)rsp + off);2360 2361	/* Initialize inode number to 0 in case no valid data in qfid context */2362	if (buf)2363		buf->IndexNumber = 0;2364 2365	while (rem >= sizeof(*cc)) {2366		doff = le16_to_cpu(cc->DataOffset);2367		dlen = le32_to_cpu(cc->DataLength);2368		if (check_add_overflow(doff, dlen, &len) || len > rem)2369			return -EINVAL;2370 2371		noff = le16_to_cpu(cc->NameOffset);2372		nlen = le16_to_cpu(cc->NameLength);2373		if (noff + nlen > doff)2374			return -EINVAL;2375 2376		name = (char *)cc + noff;2377		switch (nlen) {2378		case 4:2379			if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {2380				*oplock = server->ops->parse_lease_buf(cc, epoch,2381								       lease_key);2382			} else if (buf &&2383				   !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {2384				parse_query_id_ctxt(cc, buf);2385			}2386			break;2387		case 16:2388			if (posix && !memcmp(name, smb3_create_tag_posix, 16))2389				parse_posix_ctxt(cc, buf, posix);2390			break;2391		default:2392			cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",2393				 __func__, nlen, dlen);2394			if (IS_ENABLED(CONFIG_CIFS_DEBUG2))2395				cifs_dump_mem("context data: ", cc, dlen);2396			break;2397		}2398 2399		off = le32_to_cpu(cc->Next);2400		if (!off)2401			break;2402		if (check_sub_overflow(rem, off, &rem))2403			return -EINVAL;2404		cc = (struct create_context *)((u8 *)cc + off);2405	}2406 2407	if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)2408		*oplock = rsp->OplockLevel;2409 2410	return 0;2411}2412 2413static int2414add_lease_context(struct TCP_Server_Info *server,2415		  struct smb2_create_req *req,2416		  struct kvec *iov,2417		  unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)2418{2419	unsigned int num = *num_iovec;2420 2421	iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);2422	if (iov[num].iov_base == NULL)2423		return -ENOMEM;2424	iov[num].iov_len = server->vals->create_lease_size;2425	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;2426	*num_iovec = num + 1;2427	return 0;2428}2429 2430static struct create_durable_v2 *2431create_durable_v2_buf(struct cifs_open_parms *oparms)2432{2433	struct cifs_fid *pfid = oparms->fid;2434	struct create_durable_v2 *buf;2435 2436	buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);2437	if (!buf)2438		return NULL;2439 2440	buf->ccontext.DataOffset = cpu_to_le16(offsetof2441					(struct create_durable_v2, dcontext));2442	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));2443	buf->ccontext.NameOffset = cpu_to_le16(offsetof2444				(struct create_durable_v2, Name));2445	buf->ccontext.NameLength = cpu_to_le16(4);2446 2447	/*2448	 * NB: Handle timeout defaults to 0, which allows server to choose2449	 * (most servers default to 120 seconds) and most clients default to 0.2450	 * This can be overridden at mount ("handletimeout=") if the user wants2451	 * a different persistent (or resilient) handle timeout for all opens2452	 * on a particular SMB3 mount.2453	 */2454	buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);2455	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);2456 2457	/* for replay, we should not overwrite the existing create guid */2458	if (!oparms->replay) {2459		generate_random_uuid(buf->dcontext.CreateGuid);2460		memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);2461	} else2462		memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);2463 2464	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */2465	buf->Name[0] = 'D';2466	buf->Name[1] = 'H';2467	buf->Name[2] = '2';2468	buf->Name[3] = 'Q';2469	return buf;2470}2471 2472static struct create_durable_handle_reconnect_v2 *2473create_reconnect_durable_v2_buf(struct cifs_fid *fid)2474{2475	struct create_durable_handle_reconnect_v2 *buf;2476 2477	buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),2478			GFP_KERNEL);2479	if (!buf)2480		return NULL;2481 2482	buf->ccontext.DataOffset =2483		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,2484				     dcontext));2485	buf->ccontext.DataLength =2486		cpu_to_le32(sizeof(struct durable_reconnect_context_v2));2487	buf->ccontext.NameOffset =2488		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,2489			    Name));2490	buf->ccontext.NameLength = cpu_to_le16(4);2491 2492	buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;2493	buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;2494	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);2495	memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);2496 2497	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */2498	buf->Name[0] = 'D';2499	buf->Name[1] = 'H';2500	buf->Name[2] = '2';2501	buf->Name[3] = 'C';2502	return buf;2503}2504 2505static int2506add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,2507		    struct cifs_open_parms *oparms)2508{2509	unsigned int num = *num_iovec;2510 2511	iov[num].iov_base = create_durable_v2_buf(oparms);2512	if (iov[num].iov_base == NULL)2513		return -ENOMEM;2514	iov[num].iov_len = sizeof(struct create_durable_v2);2515	*num_iovec = num + 1;2516	return 0;2517}2518 2519static int2520add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,2521		    struct cifs_open_parms *oparms)2522{2523	unsigned int num = *num_iovec;2524 2525	/* indicate that we don't need to relock the file */2526	oparms->reconnect = false;2527 2528	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);2529	if (iov[num].iov_base == NULL)2530		return -ENOMEM;2531	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);2532	*num_iovec = num + 1;2533	return 0;2534}2535 2536static int2537add_durable_context(struct kvec *iov, unsigned int *num_iovec,2538		    struct cifs_open_parms *oparms, bool use_persistent)2539{2540	unsigned int num = *num_iovec;2541 2542	if (use_persistent) {2543		if (oparms->reconnect)2544			return add_durable_reconnect_v2_context(iov, num_iovec,2545								oparms);2546		else2547			return add_durable_v2_context(iov, num_iovec, oparms);2548	}2549 2550	if (oparms->reconnect) {2551		iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);2552		/* indicate that we don't need to relock the file */2553		oparms->reconnect = false;2554	} else2555		iov[num].iov_base = create_durable_buf();2556	if (iov[num].iov_base == NULL)2557		return -ENOMEM;2558	iov[num].iov_len = sizeof(struct create_durable);2559	*num_iovec = num + 1;2560	return 0;2561}2562 2563/* See MS-SMB2 2.2.13.2.7 */2564static struct crt_twarp_ctxt *2565create_twarp_buf(__u64 timewarp)2566{2567	struct crt_twarp_ctxt *buf;2568 2569	buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);2570	if (!buf)2571		return NULL;2572 2573	buf->ccontext.DataOffset = cpu_to_le16(offsetof2574					(struct crt_twarp_ctxt, Timestamp));2575	buf->ccontext.DataLength = cpu_to_le32(8);2576	buf->ccontext.NameOffset = cpu_to_le16(offsetof2577				(struct crt_twarp_ctxt, Name));2578	buf->ccontext.NameLength = cpu_to_le16(4);2579	/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */2580	buf->Name[0] = 'T';2581	buf->Name[1] = 'W';2582	buf->Name[2] = 'r';2583	buf->Name[3] = 'p';2584	buf->Timestamp = cpu_to_le64(timewarp);2585	return buf;2586}2587 2588/* See MS-SMB2 2.2.13.2.7 */2589static int2590add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)2591{2592	unsigned int num = *num_iovec;2593 2594	iov[num].iov_base = create_twarp_buf(timewarp);2595	if (iov[num].iov_base == NULL)2596		return -ENOMEM;2597	iov[num].iov_len = sizeof(struct crt_twarp_ctxt);2598	*num_iovec = num + 1;2599	return 0;2600}2601 2602/* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */2603static void setup_owner_group_sids(char *buf)2604{2605	struct owner_group_sids *sids = (struct owner_group_sids *)buf;2606 2607	/* Populate the user ownership fields S-1-5-88-1 */2608	sids->owner.Revision = 1;2609	sids->owner.NumAuth = 3;2610	sids->owner.Authority[5] = 5;2611	sids->owner.SubAuthorities[0] = cpu_to_le32(88);2612	sids->owner.SubAuthorities[1] = cpu_to_le32(1);2613	sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);2614 2615	/* Populate the group ownership fields S-1-5-88-2 */2616	sids->group.Revision = 1;2617	sids->group.NumAuth = 3;2618	sids->group.Authority[5] = 5;2619	sids->group.SubAuthorities[0] = cpu_to_le32(88);2620	sids->group.SubAuthorities[1] = cpu_to_le32(2);2621	sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);2622 2623	cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);2624}2625 2626/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */2627static struct crt_sd_ctxt *2628create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)2629{2630	struct crt_sd_ctxt *buf;2631	__u8 *ptr, *aclptr;2632	unsigned int acelen, acl_size, ace_count;2633	unsigned int owner_offset = 0;2634	unsigned int group_offset = 0;2635	struct smb3_acl acl = {};2636 2637	*len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);2638 2639	if (set_owner) {2640		/* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */2641		*len += sizeof(struct owner_group_sids);2642	}2643 2644	buf = kzalloc(*len, GFP_KERNEL);2645	if (buf == NULL)2646		return buf;2647 2648	ptr = (__u8 *)&buf[1];2649	if (set_owner) {2650		/* offset fields are from beginning of security descriptor not of create context */2651		owner_offset = ptr - (__u8 *)&buf->sd;2652		buf->sd.OffsetOwner = cpu_to_le32(owner_offset);2653		group_offset = owner_offset + offsetof(struct owner_group_sids, group);2654		buf->sd.OffsetGroup = cpu_to_le32(group_offset);2655 2656		setup_owner_group_sids(ptr);2657		ptr += sizeof(struct owner_group_sids);2658	} else {2659		buf->sd.OffsetOwner = 0;2660		buf->sd.OffsetGroup = 0;2661	}2662 2663	buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));2664	buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));2665	buf->ccontext.NameLength = cpu_to_le16(4);2666	/* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */2667	buf->Name[0] = 'S';2668	buf->Name[1] = 'e';2669	buf->Name[2] = 'c';2670	buf->Name[3] = 'D';2671	buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */2672 2673	/*2674	 * ACL is "self relative" ie ACL is stored in contiguous block of memory2675	 * and "DP" ie the DACL is present2676	 */2677	buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);2678 2679	/* offset owner, group and Sbz1 and SACL are all zero */2680	buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);2681	/* Ship the ACL for now. we will copy it into buf later. */2682	aclptr = ptr;2683	ptr += sizeof(struct smb3_acl);2684 2685	/* create one ACE to hold the mode embedded in reserved special SID */2686	acelen = setup_special_mode_ACE((struct smb_ace *)ptr, (__u64)mode);2687	ptr += acelen;2688	acl_size = acelen + sizeof(struct smb3_acl);2689	ace_count = 1;2690 2691	if (set_owner) {2692		/* we do not need to reallocate buffer to add the two more ACEs. plenty of space */2693		acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);2694		ptr += acelen;2695		acl_size += acelen;2696		ace_count += 1;2697	}2698 2699	/* and one more ACE to allow access for authenticated users */2700	acelen = setup_authusers_ACE((struct smb_ace *)ptr);2701	ptr += acelen;2702	acl_size += acelen;2703	ace_count += 1;2704 2705	acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */2706	acl.AclSize = cpu_to_le16(acl_size);2707	acl.AceCount = cpu_to_le16(ace_count);2708	/* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */2709	memcpy(aclptr, &acl, sizeof(struct smb3_acl));2710 2711	buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);2712	*len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);2713 2714	return buf;2715}2716 2717static int2718add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)2719{2720	unsigned int num = *num_iovec;2721	unsigned int len = 0;2722 2723	iov[num].iov_base = create_sd_buf(mode, set_owner, &len);2724	if (iov[num].iov_base == NULL)2725		return -ENOMEM;2726	iov[num].iov_len = len;2727	*num_iovec = num + 1;2728	return 0;2729}2730 2731static struct crt_query_id_ctxt *2732create_query_id_buf(void)2733{2734	struct crt_query_id_ctxt *buf;2735 2736	buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);2737	if (!buf)2738		return NULL;2739 2740	buf->ccontext.DataOffset = cpu_to_le16(0);2741	buf->ccontext.DataLength = cpu_to_le32(0);2742	buf->ccontext.NameOffset = cpu_to_le16(offsetof2743				(struct crt_query_id_ctxt, Name));2744	buf->ccontext.NameLength = cpu_to_le16(4);2745	/* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */2746	buf->Name[0] = 'Q';2747	buf->Name[1] = 'F';2748	buf->Name[2] = 'i';2749	buf->Name[3] = 'd';2750	return buf;2751}2752 2753/* See MS-SMB2 2.2.13.2.9 */2754static int2755add_query_id_context(struct kvec *iov, unsigned int *num_iovec)2756{2757	unsigned int num = *num_iovec;2758 2759	iov[num].iov_base = create_query_id_buf();2760	if (iov[num].iov_base == NULL)2761		return -ENOMEM;2762	iov[num].iov_len = sizeof(struct crt_query_id_ctxt);2763	*num_iovec = num + 1;2764	return 0;2765}2766 2767static void add_ea_context(struct cifs_open_parms *oparms,2768			   struct kvec *rq_iov, unsigned int *num_iovs)2769{2770	struct kvec *iov = oparms->ea_cctx;2771 2772	if (iov && iov->iov_base && iov->iov_len) {2773		rq_iov[(*num_iovs)++] = *iov;2774		memset(iov, 0, sizeof(*iov));2775	}2776}2777 2778static int2779alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,2780			    const char *treename, const __le16 *path)2781{2782	int treename_len, path_len;2783	struct nls_table *cp;2784	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};2785 2786	/*2787	 * skip leading "\\"2788	 */2789	treename_len = strlen(treename);2790	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))2791		return -EINVAL;2792 2793	treename += 2;2794	treename_len -= 2;2795 2796	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);2797 2798	/* make room for one path separator only if @path isn't empty */2799	*out_len = treename_len + (path[0] ? 1 : 0) + path_len;2800 2801	/*2802	 * final path needs to be 8-byte aligned as specified in2803	 * MS-SMB2 2.2.13 SMB2 CREATE Request.2804	 */2805	*out_size = round_up(*out_len * sizeof(__le16), 8);2806	*out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);2807	if (!*out_path)2808		return -ENOMEM;2809 2810	cp = load_nls_default();2811	cifs_strtoUTF16(*out_path, treename, treename_len, cp);2812 2813	/* Do not append the separator if the path is empty */2814	if (path[0] != cpu_to_le16(0x0000)) {2815		UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);2816		UniStrcat((wchar_t *)*out_path, (wchar_t *)path);2817	}2818 2819	unload_nls(cp);2820 2821	return 0;2822}2823 2824int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,2825			       umode_t mode, struct cifs_tcon *tcon,2826			       const char *full_path,2827			       struct cifs_sb_info *cifs_sb)2828{2829	struct smb_rqst rqst;2830	struct smb2_create_req *req;2831	struct smb2_create_rsp *rsp = NULL;2832	struct cifs_ses *ses = tcon->ses;2833	struct kvec iov[3]; /* make sure at least one for each open context */2834	struct kvec rsp_iov = {NULL, 0};2835	int resp_buftype;2836	int uni_path_len;2837	__le16 *copy_path = NULL;2838	int copy_size;2839	int rc = 0;2840	unsigned int n_iov = 2;2841	__u32 file_attributes = 0;2842	char *pc_buf = NULL;2843	int flags = 0;2844	unsigned int total_len;2845	__le16 *utf16_path = NULL;2846	struct TCP_Server_Info *server;2847	int retries = 0, cur_sleep = 1;2848 2849replay_again:2850	/* reinitialize for possible replay */2851	flags = 0;2852	n_iov = 2;2853	server = cifs_pick_channel(ses);2854 2855	cifs_dbg(FYI, "mkdir\n");2856 2857	/* resource #1: path allocation */2858	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);2859	if (!utf16_path)2860		return -ENOMEM;2861 2862	if (!ses || !server) {2863		rc = -EIO;2864		goto err_free_path;2865	}2866 2867	/* resource #2: request */2868	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,2869				 (void **) &req, &total_len);2870	if (rc)2871		goto err_free_path;2872 2873 2874	if (smb3_encryption_required(tcon))2875		flags |= CIFS_TRANSFORM_REQ;2876 2877	req->ImpersonationLevel = IL_IMPERSONATION;2878	req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);2879	/* File attributes ignored on open (used in create though) */2880	req->FileAttributes = cpu_to_le32(file_attributes);2881	req->ShareAccess = FILE_SHARE_ALL_LE;2882	req->CreateDisposition = cpu_to_le32(FILE_CREATE);2883	req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);2884 2885	iov[0].iov_base = (char *)req;2886	/* -1 since last byte is buf[0] which is sent below (path) */2887	iov[0].iov_len = total_len - 1;2888 2889	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));2890 2891	/* [MS-SMB2] 2.2.13 NameOffset:2892	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of2893	 * the SMB2 header, the file name includes a prefix that will2894	 * be processed during DFS name normalization as specified in2895	 * section 3.3.5.9. Otherwise, the file name is relative to2896	 * the share that is identified by the TreeId in the SMB22897	 * header.2898	 */2899	if (tcon->share_flags & SHI1005_FLAGS_DFS) {2900		int name_len;2901 2902		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;2903		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,2904						 &name_len,2905						 tcon->tree_name, utf16_path);2906		if (rc)2907			goto err_free_req;2908 2909		req->NameLength = cpu_to_le16(name_len * 2);2910		uni_path_len = copy_size;2911		/* free before overwriting resource */2912		kfree(utf16_path);2913		utf16_path = copy_path;2914	} else {2915		uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;2916		/* MUST set path len (NameLength) to 0 opening root of share */2917		req->NameLength = cpu_to_le16(uni_path_len - 2);2918		if (uni_path_len % 8 != 0) {2919			copy_size = roundup(uni_path_len, 8);2920			copy_path = kzalloc(copy_size, GFP_KERNEL);2921			if (!copy_path) {2922				rc = -ENOMEM;2923				goto err_free_req;2924			}2925			memcpy((char *)copy_path, (const char *)utf16_path,2926			       uni_path_len);2927			uni_path_len = copy_size;2928			/* free before overwriting resource */2929			kfree(utf16_path);2930			utf16_path = copy_path;2931		}2932	}2933 2934	iov[1].iov_len = uni_path_len;2935	iov[1].iov_base = utf16_path;2936	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;2937 2938	if (tcon->posix_extensions) {2939		/* resource #3: posix buf */2940		rc = add_posix_context(iov, &n_iov, mode);2941		if (rc)2942			goto err_free_req;2943		req->CreateContextsOffset = cpu_to_le32(2944			sizeof(struct smb2_create_req) +2945			iov[1].iov_len);2946		pc_buf = iov[n_iov-1].iov_base;2947	}2948 2949 2950	memset(&rqst, 0, sizeof(struct smb_rqst));2951	rqst.rq_iov = iov;2952	rqst.rq_nvec = n_iov;2953 2954	/* no need to inc num_remote_opens because we close it just below */2955	trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,2956				    FILE_WRITE_ATTRIBUTES);2957 2958	if (retries)2959		smb2_set_replay(server, &rqst);2960 2961	/* resource #4: response buffer */2962	rc = cifs_send_recv(xid, ses, server,2963			    &rqst, &resp_buftype, flags, &rsp_iov);2964	if (rc) {2965		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);2966		trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,2967					   CREATE_NOT_FILE,2968					   FILE_WRITE_ATTRIBUTES, rc);2969		goto err_free_rsp_buf;2970	}2971 2972	/*2973	 * Although unlikely to be possible for rsp to be null and rc not set,2974	 * adding check below is slightly safer long term (and quiets Coverity2975	 * warning)2976	 */2977	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;2978	if (rsp == NULL) {2979		rc = -EIO;2980		kfree(pc_buf);2981		goto err_free_req;2982	}2983 2984	trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,2985				    CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);2986 2987	SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);2988 2989	/* Eventually save off posix specific response info and timestamps */2990 2991err_free_rsp_buf:2992	free_rsp_buf(resp_buftype, rsp);2993	kfree(pc_buf);2994err_free_req:2995	cifs_small_buf_release(req);2996err_free_path:2997	kfree(utf16_path);2998 2999	if (is_replayable_error(rc) &&3000	    smb2_should_replay(tcon, &retries, &cur_sleep))3001		goto replay_again;3002 3003	return rc;3004}3005 3006int3007SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,3008	       struct smb_rqst *rqst, __u8 *oplock,3009	       struct cifs_open_parms *oparms, __le16 *path)3010{3011	struct smb2_create_req *req;3012	unsigned int n_iov = 2;3013	__u32 file_attributes = 0;3014	int copy_size;3015	int uni_path_len;3016	unsigned int total_len;3017	struct kvec *iov = rqst->rq_iov;3018	__le16 *copy_path;3019	int rc;3020 3021	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,3022				 (void **) &req, &total_len);3023	if (rc)3024		return rc;3025 3026	iov[0].iov_base = (char *)req;3027	/* -1 since last byte is buf[0] which is sent below (path) */3028	iov[0].iov_len = total_len - 1;3029 3030	if (oparms->create_options & CREATE_OPTION_READONLY)3031		file_attributes |= ATTR_READONLY;3032	if (oparms->create_options & CREATE_OPTION_SPECIAL)3033		file_attributes |= ATTR_SYSTEM;3034 3035	req->ImpersonationLevel = IL_IMPERSONATION;3036	req->DesiredAccess = cpu_to_le32(oparms->desired_access);3037	/* File attributes ignored on open (used in create though) */3038	req->FileAttributes = cpu_to_le32(file_attributes);3039	req->ShareAccess = FILE_SHARE_ALL_LE;3040 3041	req->CreateDisposition = cpu_to_le32(oparms->disposition);3042	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);3043	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));3044 3045	/* [MS-SMB2] 2.2.13 NameOffset:3046	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of3047	 * the SMB2 header, the file name includes a prefix that will3048	 * be processed during DFS name normalization as specified in3049	 * section 3.3.5.9. Otherwise, the file name is relative to3050	 * the share that is identified by the TreeId in the SMB23051	 * header.3052	 */3053	if (tcon->share_flags & SHI1005_FLAGS_DFS) {3054		int name_len;3055 3056		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;3057		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,3058						 &name_len,3059						 tcon->tree_name, path);3060		if (rc)3061			return rc;3062		req->NameLength = cpu_to_le16(name_len * 2);3063		uni_path_len = copy_size;3064		path = copy_path;3065	} else {3066		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;3067		/* MUST set path len (NameLength) to 0 opening root of share */3068		req->NameLength = cpu_to_le16(uni_path_len - 2);3069		copy_size = round_up(uni_path_len, 8);3070		copy_path = kzalloc(copy_size, GFP_KERNEL);3071		if (!copy_path)3072			return -ENOMEM;3073		memcpy((char *)copy_path, (const char *)path,3074		       uni_path_len);3075		uni_path_len = copy_size;3076		path = copy_path;3077	}3078 3079	iov[1].iov_len = uni_path_len;3080	iov[1].iov_base = path;3081 3082	if ((!server->oplocks) || (tcon->no_lease))3083		*oplock = SMB2_OPLOCK_LEVEL_NONE;3084 3085	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||3086	    *oplock == SMB2_OPLOCK_LEVEL_NONE)3087		req->RequestedOplockLevel = *oplock;3088	else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&3089		  (oparms->create_options & CREATE_NOT_FILE))3090		req->RequestedOplockLevel = *oplock; /* no srv lease support */3091	else {3092		rc = add_lease_context(server, req, iov, &n_iov,3093				       oparms->fid->lease_key, oplock);3094		if (rc)3095			return rc;3096	}3097 3098	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {3099		rc = add_durable_context(iov, &n_iov, oparms,3100					tcon->use_persistent);3101		if (rc)3102			return rc;3103	}3104 3105	if (tcon->posix_extensions) {3106		rc = add_posix_context(iov, &n_iov, oparms->mode);3107		if (rc)3108			return rc;3109	}3110 3111	if (tcon->snapshot_time) {3112		cifs_dbg(FYI, "adding snapshot context\n");3113		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);3114		if (rc)3115			return rc;3116	}3117 3118	if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {3119		bool set_mode;3120		bool set_owner;3121 3122		if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&3123		    (oparms->mode != ACL_NO_MODE))3124			set_mode = true;3125		else {3126			set_mode = false;3127			oparms->mode = ACL_NO_MODE;3128		}3129 3130		if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)3131			set_owner = true;3132		else3133			set_owner = false;3134 3135		if (set_owner | set_mode) {3136			cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);3137			rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);3138			if (rc)3139				return rc;3140		}3141	}3142 3143	add_query_id_context(iov, &n_iov);3144	add_ea_context(oparms, iov, &n_iov);3145 3146	if (n_iov > 2) {3147		/*3148		 * We have create contexts behind iov[1] (the file3149		 * name), point at them from the main create request3150		 */3151		req->CreateContextsOffset = cpu_to_le32(3152			sizeof(struct smb2_create_req) +3153			iov[1].iov_len);3154		req->CreateContextsLength = 0;3155 3156		for (unsigned int i = 2; i < (n_iov-1); i++) {3157			struct kvec *v = &iov[i];3158			size_t len = v->iov_len;3159			struct create_context *cctx =3160				(struct create_context *)v->iov_base;3161 3162			cctx->Next = cpu_to_le32(len);3163			le32_add_cpu(&req->CreateContextsLength, len);3164		}3165		le32_add_cpu(&req->CreateContextsLength,3166			     iov[n_iov-1].iov_len);3167	}3168 3169	rqst->rq_nvec = n_iov;3170	return 0;3171}3172 3173/* rq_iov[0] is the request and is released by cifs_small_buf_release().3174 * All other vectors are freed by kfree().3175 */3176void3177SMB2_open_free(struct smb_rqst *rqst)3178{3179	int i;3180 3181	if (rqst && rqst->rq_iov) {3182		cifs_small_buf_release(rqst->rq_iov[0].iov_base);3183		for (i = 1; i < rqst->rq_nvec; i++)3184			if (rqst->rq_iov[i].iov_base != smb2_padding)3185				kfree(rqst->rq_iov[i].iov_base);3186	}3187}3188 3189int3190SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,3191	  __u8 *oplock, struct smb2_file_all_info *buf,3192	  struct create_posix_rsp *posix,3193	  struct kvec *err_iov, int *buftype)3194{3195	struct smb_rqst rqst;3196	struct smb2_create_rsp *rsp = NULL;3197	struct cifs_tcon *tcon = oparms->tcon;3198	struct cifs_ses *ses = tcon->ses;3199	struct TCP_Server_Info *server;3200	struct kvec iov[SMB2_CREATE_IOV_SIZE];3201	struct kvec rsp_iov = {NULL, 0};3202	int resp_buftype = CIFS_NO_BUFFER;3203	int rc = 0;3204	int flags = 0;3205	int retries = 0, cur_sleep = 1;3206 3207replay_again:3208	/* reinitialize for possible replay */3209	flags = 0;3210	server = cifs_pick_channel(ses);3211	oparms->replay = !!(retries);3212 3213	cifs_dbg(FYI, "create/open\n");3214	if (!ses || !server)3215		return -EIO;3216 3217	if (smb3_encryption_required(tcon))3218		flags |= CIFS_TRANSFORM_REQ;3219 3220	memset(&rqst, 0, sizeof(struct smb_rqst));3221	memset(&iov, 0, sizeof(iov));3222	rqst.rq_iov = iov;3223	rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;3224 3225	rc = SMB2_open_init(tcon, server,3226			    &rqst, oplock, oparms, path);3227	if (rc)3228		goto creat_exit;3229 3230	trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,3231		oparms->create_options, oparms->desired_access);3232 3233	if (retries)3234		smb2_set_replay(server, &rqst);3235 3236	rc = cifs_send_recv(xid, ses, server,3237			    &rqst, &resp_buftype, flags,3238			    &rsp_iov);3239	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;3240 3241	if (rc != 0) {3242		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);3243		if (err_iov && rsp) {3244			*err_iov = rsp_iov;3245			*buftype = resp_buftype;3246			resp_buftype = CIFS_NO_BUFFER;3247			rsp = NULL;3248		}3249		trace_smb3_open_err(xid, tcon->tid, ses->Suid,3250				    oparms->create_options, oparms->desired_access, rc);3251		if (rc == -EREMCHG) {3252			pr_warn_once("server share %s deleted\n",3253				     tcon->tree_name);3254			tcon->need_reconnect = true;3255		}3256		goto creat_exit;3257	} else if (rsp == NULL) /* unlikely to happen, but safer to check */3258		goto creat_exit;3259	else3260		trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,3261				     oparms->create_options, oparms->desired_access);3262 3263	atomic_inc(&tcon->num_remote_opens);3264	oparms->fid->persistent_fid = rsp->PersistentFileId;3265	oparms->fid->volatile_fid = rsp->VolatileFileId;3266	oparms->fid->access = oparms->desired_access;3267#ifdef CONFIG_CIFS_DEBUG23268	oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);3269#endif /* CIFS_DEBUG2 */3270 3271	if (buf) {3272		buf->CreationTime = rsp->CreationTime;3273		buf->LastAccessTime = rsp->LastAccessTime;3274		buf->LastWriteTime = rsp->LastWriteTime;3275		buf->ChangeTime = rsp->ChangeTime;3276		buf->AllocationSize = rsp->AllocationSize;3277		buf->EndOfFile = rsp->EndofFile;3278		buf->Attributes = rsp->FileAttributes;3279		buf->NumberOfLinks = cpu_to_le32(1);3280		buf->DeletePending = 0;3281	}3282 3283 3284	rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,3285				 oparms->fid->lease_key, oplock, buf, posix);3286creat_exit:3287	SMB2_open_free(&rqst);3288	free_rsp_buf(resp_buftype, rsp);3289 3290	if (is_replayable_error(rc) &&3291	    smb2_should_replay(tcon, &retries, &cur_sleep))3292		goto replay_again;3293 3294	return rc;3295}3296 3297int3298SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,3299		struct smb_rqst *rqst,3300		u64 persistent_fid, u64 volatile_fid, u32 opcode,3301		char *in_data, u32 indatalen,3302		__u32 max_response_size)3303{3304	struct smb2_ioctl_req *req;3305	struct kvec *iov = rqst->rq_iov;3306	unsigned int total_len;3307	int rc;3308	char *in_data_buf;3309 3310	rc = smb2_ioctl_req_init(opcode, tcon, server,3311				 (void **) &req, &total_len);3312	if (rc)3313		return rc;3314 3315	if (indatalen) {3316		unsigned int len;3317 3318		if (WARN_ON_ONCE(smb3_encryption_required(tcon) &&3319				 (check_add_overflow(total_len - 1,3320						     ALIGN(indatalen, 8), &len) ||3321				  len > MAX_CIFS_SMALL_BUFFER_SIZE))) {3322			cifs_small_buf_release(req);3323			return -EIO;3324		}3325		/*3326		 * indatalen is usually small at a couple of bytes max, so3327		 * just allocate through generic pool3328		 */3329		in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);3330		if (!in_data_buf) {3331			cifs_small_buf_release(req);3332			return -ENOMEM;3333		}3334	}3335 3336	req->CtlCode = cpu_to_le32(opcode);3337	req->PersistentFileId = persistent_fid;3338	req->VolatileFileId = volatile_fid;3339 3340	iov[0].iov_base = (char *)req;3341	/*3342	 * If no input data, the size of ioctl struct in3343	 * protocol spec still includes a 1 byte data buffer,3344	 * but if input data passed to ioctl, we do not3345	 * want to double count this, so we do not send3346	 * the dummy one byte of data in iovec[0] if sending3347	 * input data (in iovec[1]).3348	 */3349	if (indatalen) {3350		req->InputCount = cpu_to_le32(indatalen);3351		/* do not set InputOffset if no input data */3352		req->InputOffset =3353		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));3354		rqst->rq_nvec = 2;3355		iov[0].iov_len = total_len - 1;3356		iov[1].iov_base = in_data_buf;3357		iov[1].iov_len = indatalen;3358	} else {3359		rqst->rq_nvec = 1;3360		iov[0].iov_len = total_len;3361	}3362 3363	req->OutputOffset = 0;3364	req->OutputCount = 0; /* MBZ */3365 3366	/*3367	 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)3368	 * We Could increase default MaxOutputResponse, but that could require3369	 * more credits. Windows typically sets this smaller, but for some3370	 * ioctls it may be useful to allow server to send more. No point3371	 * limiting what the server can send as long as fits in one credit3372	 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want3373	 * to increase this limit up in the future.3374	 * Note that for snapshot queries that servers like Azure expect that3375	 * the first query be minimal size (and just used to get the number/size3376	 * of previous versions) so response size must be specified as EXACTLY3377	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple3378	 * of eight bytes.  Currently that is the only case where we set max3379	 * response size smaller.3380	 */3381	req->MaxOutputResponse = cpu_to_le32(max_response_size);3382	req->hdr.CreditCharge =3383		cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),3384					 SMB2_MAX_BUFFER_SIZE));3385	/* always an FSCTL (for now) */3386	req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);3387 3388	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */3389	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)3390		req->hdr.Flags |= SMB2_FLAGS_SIGNED;3391 3392	return 0;3393}3394 3395void3396SMB2_ioctl_free(struct smb_rqst *rqst)3397{3398	int i;3399 3400	if (rqst && rqst->rq_iov) {3401		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */3402		for (i = 1; i < rqst->rq_nvec; i++)3403			if (rqst->rq_iov[i].iov_base != smb2_padding)3404				kfree(rqst->rq_iov[i].iov_base);3405	}3406}3407 3408 3409/*3410 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs3411 */3412int3413SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,3414	   u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,3415	   u32 max_out_data_len, char **out_data,3416	   u32 *plen /* returned data len */)3417{3418	struct smb_rqst rqst;3419	struct smb2_ioctl_rsp *rsp = NULL;3420	struct cifs_ses *ses;3421	struct TCP_Server_Info *server;3422	struct kvec iov[SMB2_IOCTL_IOV_SIZE];3423	struct kvec rsp_iov = {NULL, 0};3424	int resp_buftype = CIFS_NO_BUFFER;3425	int rc = 0;3426	int flags = 0;3427	int retries = 0, cur_sleep = 1;3428 3429	if (!tcon)3430		return -EIO;3431 3432	ses = tcon->ses;3433	if (!ses)3434		return -EIO;3435 3436replay_again:3437	/* reinitialize for possible replay */3438	flags = 0;3439	server = cifs_pick_channel(ses);3440 3441	if (!server)3442		return -EIO;3443 3444	cifs_dbg(FYI, "SMB2 IOCTL\n");3445 3446	if (out_data != NULL)3447		*out_data = NULL;3448 3449	/* zero out returned data len, in case of error */3450	if (plen)3451		*plen = 0;3452 3453	if (smb3_encryption_required(tcon))3454		flags |= CIFS_TRANSFORM_REQ;3455 3456	memset(&rqst, 0, sizeof(struct smb_rqst));3457	memset(&iov, 0, sizeof(iov));3458	rqst.rq_iov = iov;3459	rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;3460 3461	rc = SMB2_ioctl_init(tcon, server,3462			     &rqst, persistent_fid, volatile_fid, opcode,3463			     in_data, indatalen, max_out_data_len);3464	if (rc)3465		goto ioctl_exit;3466 3467	if (retries)3468		smb2_set_replay(server, &rqst);3469 3470	rc = cifs_send_recv(xid, ses, server,3471			    &rqst, &resp_buftype, flags,3472			    &rsp_iov);3473	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;3474 3475	if (rc != 0)3476		trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,3477				ses->Suid, 0, opcode, rc);3478 3479	if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {3480		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);3481		goto ioctl_exit;3482	} else if (rc == -EINVAL) {3483		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&3484		    (opcode != FSCTL_SRV_COPYCHUNK)) {3485			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);3486			goto ioctl_exit;3487		}3488	} else if (rc == -E2BIG) {3489		if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {3490			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);3491			goto ioctl_exit;3492		}3493	}3494 3495	/* check if caller wants to look at return data or just return rc */3496	if ((plen == NULL) || (out_data == NULL))3497		goto ioctl_exit;3498 3499	/*3500	 * Although unlikely to be possible for rsp to be null and rc not set,3501	 * adding check below is slightly safer long term (and quiets Coverity3502	 * warning)3503	 */3504	if (rsp == NULL) {3505		rc = -EIO;3506		goto ioctl_exit;3507	}3508 3509	*plen = le32_to_cpu(rsp->OutputCount);3510 3511	/* We check for obvious errors in the output buffer length and offset */3512	if (*plen == 0)3513		goto ioctl_exit; /* server returned no data */3514	else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {3515		cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);3516		*plen = 0;3517		rc = -EIO;3518		goto ioctl_exit;3519	}3520 3521	if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {3522		cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,3523			le32_to_cpu(rsp->OutputOffset));3524		*plen = 0;3525		rc = -EIO;3526		goto ioctl_exit;3527	}3528 3529	*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),3530			    *plen, GFP_KERNEL);3531	if (*out_data == NULL) {3532		rc = -ENOMEM;3533		goto ioctl_exit;3534	}3535 3536ioctl_exit:3537	SMB2_ioctl_free(&rqst);3538	free_rsp_buf(resp_buftype, rsp);3539 3540	if (is_replayable_error(rc) &&3541	    smb2_should_replay(tcon, &retries, &cur_sleep))3542		goto replay_again;3543 3544	return rc;3545}3546 3547/*3548 *   Individual callers to ioctl worker function follow3549 */3550 3551int3552SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,3553		     u64 persistent_fid, u64 volatile_fid)3554{3555	int rc;3556	struct  compress_ioctl fsctl_input;3557	char *ret_data = NULL;3558 3559	fsctl_input.CompressionState =3560			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);3561 3562	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,3563			FSCTL_SET_COMPRESSION,3564			(char *)&fsctl_input /* data input */,3565			2 /* in data len */, CIFSMaxBufSize /* max out data */,3566			&ret_data /* out data */, NULL);3567 3568	cifs_dbg(FYI, "set compression rc %d\n", rc);3569 3570	return rc;3571}3572 3573int3574SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,3575		struct smb_rqst *rqst,3576		u64 persistent_fid, u64 volatile_fid, bool query_attrs)3577{3578	struct smb2_close_req *req;3579	struct kvec *iov = rqst->rq_iov;3580	unsigned int total_len;3581	int rc;3582 3583	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,3584				 (void **) &req, &total_len);3585	if (rc)3586		return rc;3587 3588	req->PersistentFileId = persistent_fid;3589	req->VolatileFileId = volatile_fid;3590	if (query_attrs)3591		req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;3592	else3593		req->Flags = 0;3594	iov[0].iov_base = (char *)req;3595	iov[0].iov_len = total_len;3596 3597	return 0;3598}3599 3600void3601SMB2_close_free(struct smb_rqst *rqst)3602{3603	if (rqst && rqst->rq_iov)3604		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */3605}3606 3607int3608__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,3609	     u64 persistent_fid, u64 volatile_fid,3610	     struct smb2_file_network_open_info *pbuf)3611{3612	struct smb_rqst rqst;3613	struct smb2_close_rsp *rsp = NULL;3614	struct cifs_ses *ses = tcon->ses;3615	struct TCP_Server_Info *server;3616	struct kvec iov[1];3617	struct kvec rsp_iov;3618	int resp_buftype = CIFS_NO_BUFFER;3619	int rc = 0;3620	int flags = 0;3621	bool query_attrs = false;3622	int retries = 0, cur_sleep = 1;3623 3624replay_again:3625	/* reinitialize for possible replay */3626	flags = 0;3627	query_attrs = false;3628	server = cifs_pick_channel(ses);3629 3630	cifs_dbg(FYI, "Close\n");3631 3632	if (!ses || !server)3633		return -EIO;3634 3635	if (smb3_encryption_required(tcon))3636		flags |= CIFS_TRANSFORM_REQ;3637 3638	memset(&rqst, 0, sizeof(struct smb_rqst));3639	memset(&iov, 0, sizeof(iov));3640	rqst.rq_iov = iov;3641	rqst.rq_nvec = 1;3642 3643	/* check if need to ask server to return timestamps in close response */3644	if (pbuf)3645		query_attrs = true;3646 3647	trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);3648	rc = SMB2_close_init(tcon, server,3649			     &rqst, persistent_fid, volatile_fid,3650			     query_attrs);3651	if (rc)3652		goto close_exit;3653 3654	if (retries)3655		smb2_set_replay(server, &rqst);3656 3657	rc = cifs_send_recv(xid, ses, server,3658			    &rqst, &resp_buftype, flags, &rsp_iov);3659	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;3660 3661	if (rc != 0) {3662		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);3663		trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,3664				     rc);3665		goto close_exit;3666	} else {3667		trace_smb3_close_done(xid, persistent_fid, tcon->tid,3668				      ses->Suid);3669		if (pbuf)3670			memcpy(&pbuf->network_open_info,3671			       &rsp->network_open_info,3672			       sizeof(pbuf->network_open_info));3673		atomic_dec(&tcon->num_remote_opens);3674	}3675 3676close_exit:3677	SMB2_close_free(&rqst);3678	free_rsp_buf(resp_buftype, rsp);3679 3680	/* retry close in a worker thread if this one is interrupted */3681	if (is_interrupt_error(rc)) {3682		int tmp_rc;3683 3684		tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,3685						     volatile_fid);3686		if (tmp_rc)3687			cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",3688				 persistent_fid, tmp_rc);3689	}3690 3691	if (is_replayable_error(rc) &&3692	    smb2_should_replay(tcon, &retries, &cur_sleep))3693		goto replay_again;3694 3695	return rc;3696}3697 3698int3699SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,3700		u64 persistent_fid, u64 volatile_fid)3701{3702	return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);3703}3704 3705int3706smb2_validate_iov(unsigned int offset, unsigned int buffer_length,3707		  struct kvec *iov, unsigned int min_buf_size)3708{3709	unsigned int smb_len = iov->iov_len;3710	char *end_of_smb = smb_len + (char *)iov->iov_base;3711	char *begin_of_buf = offset + (char *)iov->iov_base;3712	char *end_of_buf = begin_of_buf + buffer_length;3713 3714 3715	if (buffer_length < min_buf_size) {3716		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",3717			 buffer_length, min_buf_size);3718		return -EINVAL;3719	}3720 3721	/* check if beyond RFC1001 maximum length */3722	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {3723		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",3724			 buffer_length, smb_len);3725		return -EINVAL;3726	}3727 3728	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {3729		cifs_dbg(VFS, "Invalid server response, bad offset to data\n");3730		return -EINVAL;3731	}3732 3733	return 0;3734}3735 3736/*3737 * If SMB buffer fields are valid, copy into temporary buffer to hold result.3738 * Caller must free buffer.3739 */3740int3741smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,3742			   struct kvec *iov, unsigned int minbufsize,3743			   char *data)3744{3745	char *begin_of_buf = offset + (char *)iov->iov_base;3746	int rc;3747 3748	if (!data)3749		return -EINVAL;3750 3751	rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);3752	if (rc)3753		return rc;3754 3755	memcpy(data, begin_of_buf, minbufsize);3756 3757	return 0;3758}3759 3760int3761SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,3762		     struct smb_rqst *rqst,3763		     u64 persistent_fid, u64 volatile_fid,3764		     u8 info_class, u8 info_type, u32 additional_info,3765		     size_t output_len, size_t input_len, void *input)3766{3767	struct smb2_query_info_req *req;3768	struct kvec *iov = rqst->rq_iov;3769	unsigned int total_len;3770	size_t len;3771	int rc;3772 3773	if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||3774		     len > CIFSMaxBufSize))3775		return -EINVAL;3776 3777	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,3778				 (void **) &req, &total_len);3779	if (rc)3780		return rc;3781 3782	req->InfoType = info_type;3783	req->FileInfoClass = info_class;3784	req->PersistentFileId = persistent_fid;3785	req->VolatileFileId = volatile_fid;3786	req->AdditionalInformation = cpu_to_le32(additional_info);3787 3788	req->OutputBufferLength = cpu_to_le32(output_len);3789	if (input_len) {3790		req->InputBufferLength = cpu_to_le32(input_len);3791		/* total_len for smb query request never close to le16 max */3792		req->InputBufferOffset = cpu_to_le16(total_len - 1);3793		memcpy(req->Buffer, input, input_len);3794	}3795 3796	iov[0].iov_base = (char *)req;3797	/* 1 for Buffer */3798	iov[0].iov_len = len;3799	return 0;3800}3801 3802void3803SMB2_query_info_free(struct smb_rqst *rqst)3804{3805	if (rqst && rqst->rq_iov)3806		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */3807}3808 3809static int3810query_info(const unsigned int xid, struct cifs_tcon *tcon,3811	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,3812	   u32 additional_info, size_t output_len, size_t min_len, void **data,3813		u32 *dlen)3814{3815	struct smb_rqst rqst;3816	struct smb2_query_info_rsp *rsp = NULL;3817	struct kvec iov[1];3818	struct kvec rsp_iov;3819	int rc = 0;3820	int resp_buftype = CIFS_NO_BUFFER;3821	struct cifs_ses *ses = tcon->ses;3822	struct TCP_Server_Info *server;3823	int flags = 0;3824	bool allocated = false;3825	int retries = 0, cur_sleep = 1;3826 3827	cifs_dbg(FYI, "Query Info\n");3828 3829	if (!ses)3830		return -EIO;3831 3832replay_again:3833	/* reinitialize for possible replay */3834	flags = 0;3835	allocated = false;3836	server = cifs_pick_channel(ses);3837 3838	if (!server)3839		return -EIO;3840 3841	if (smb3_encryption_required(tcon))3842		flags |= CIFS_TRANSFORM_REQ;3843 3844	memset(&rqst, 0, sizeof(struct smb_rqst));3845	memset(&iov, 0, sizeof(iov));3846	rqst.rq_iov = iov;3847	rqst.rq_nvec = 1;3848 3849	rc = SMB2_query_info_init(tcon, server,3850				  &rqst, persistent_fid, volatile_fid,3851				  info_class, info_type, additional_info,3852				  output_len, 0, NULL);3853	if (rc)3854		goto qinf_exit;3855 3856	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,3857				    ses->Suid, info_class, (__u32)info_type);3858 3859	if (retries)3860		smb2_set_replay(server, &rqst);3861 3862	rc = cifs_send_recv(xid, ses, server,3863			    &rqst, &resp_buftype, flags, &rsp_iov);3864	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;3865 3866	if (rc) {3867		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);3868		trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,3869				ses->Suid, info_class, (__u32)info_type, rc);3870		goto qinf_exit;3871	}3872 3873	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,3874				ses->Suid, info_class, (__u32)info_type);3875 3876	if (dlen) {3877		*dlen = le32_to_cpu(rsp->OutputBufferLength);3878		if (!*data) {3879			*data = kmalloc(*dlen, GFP_KERNEL);3880			if (!*data) {3881				cifs_tcon_dbg(VFS,3882					"Error %d allocating memory for acl\n",3883					rc);3884				*dlen = 0;3885				rc = -ENOMEM;3886				goto qinf_exit;3887			}3888			allocated = true;3889		}3890	}3891 3892	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),3893					le32_to_cpu(rsp->OutputBufferLength),3894					&rsp_iov, dlen ? *dlen : min_len, *data);3895	if (rc && allocated) {3896		kfree(*data);3897		*data = NULL;3898		*dlen = 0;3899	}3900 3901qinf_exit:3902	SMB2_query_info_free(&rqst);3903	free_rsp_buf(resp_buftype, rsp);3904 3905	if (is_replayable_error(rc) &&3906	    smb2_should_replay(tcon, &retries, &cur_sleep))3907		goto replay_again;3908 3909	return rc;3910}3911 3912int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,3913	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)3914{3915	return query_info(xid, tcon, persistent_fid, volatile_fid,3916			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,3917			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,3918			  sizeof(struct smb2_file_all_info), (void **)&data,3919			  NULL);3920}3921 3922#if 03923/* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */3924int3925SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,3926		u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)3927{3928	size_t output_len = sizeof(struct smb311_posix_qinfo *) +3929			(sizeof(struct smb_sid) * 2) + (PATH_MAX * 2);3930	*plen = 0;3931 3932	return query_info(xid, tcon, persistent_fid, volatile_fid,3933			  SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,3934			  output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);3935	/* Note caller must free "data" (passed in above). It may be allocated in query_info call */3936}3937#endif3938 3939int3940SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,3941	       u64 persistent_fid, u64 volatile_fid,3942	       void **data, u32 *plen, u32 extra_info)3943{3944	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |3945				extra_info;3946	*plen = 0;3947 3948	return query_info(xid, tcon, persistent_fid, volatile_fid,3949			  0, SMB2_O_INFO_SECURITY, additional_info,3950			  SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);3951}3952 3953int3954SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,3955		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)3956{3957	return query_info(xid, tcon, persistent_fid, volatile_fid,3958			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,3959			  sizeof(struct smb2_file_internal_info),3960			  sizeof(struct smb2_file_internal_info),3961			  (void **)&uniqueid, NULL);3962}3963 3964/*3965 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory3966 * See MS-SMB2 2.2.35 and 2.2.363967 */3968 3969static int3970SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,3971		 struct cifs_tcon *tcon, struct TCP_Server_Info *server,3972		 u64 persistent_fid, u64 volatile_fid,3973		 u32 completion_filter, bool watch_tree)3974{3975	struct smb2_change_notify_req *req;3976	struct kvec *iov = rqst->rq_iov;3977	unsigned int total_len;3978	int rc;3979 3980	rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,3981				 (void **) &req, &total_len);3982	if (rc)3983		return rc;3984 3985	req->PersistentFileId = persistent_fid;3986	req->VolatileFileId = volatile_fid;3987	/* See note 354 of MS-SMB2, 64K max */3988	req->OutputBufferLength =3989		cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);3990	req->CompletionFilter = cpu_to_le32(completion_filter);3991	if (watch_tree)3992		req->Flags = cpu_to_le16(SMB2_WATCH_TREE);3993	else3994		req->Flags = 0;3995 3996	iov[0].iov_base = (char *)req;3997	iov[0].iov_len = total_len;3998 3999	return 0;4000}4001 4002int4003SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,4004		u64 persistent_fid, u64 volatile_fid, bool watch_tree,4005		u32 completion_filter, u32 max_out_data_len, char **out_data,4006		u32 *plen /* returned data len */)4007{4008	struct cifs_ses *ses = tcon->ses;4009	struct TCP_Server_Info *server;4010	struct smb_rqst rqst;4011	struct smb2_change_notify_rsp *smb_rsp;4012	struct kvec iov[1];4013	struct kvec rsp_iov = {NULL, 0};4014	int resp_buftype = CIFS_NO_BUFFER;4015	int flags = 0;4016	int rc = 0;4017	int retries = 0, cur_sleep = 1;4018 4019replay_again:4020	/* reinitialize for possible replay */4021	flags = 0;4022	server = cifs_pick_channel(ses);4023 4024	cifs_dbg(FYI, "change notify\n");4025	if (!ses || !server)4026		return -EIO;4027 4028	if (smb3_encryption_required(tcon))4029		flags |= CIFS_TRANSFORM_REQ;4030 4031	memset(&rqst, 0, sizeof(struct smb_rqst));4032	memset(&iov, 0, sizeof(iov));4033	if (plen)4034		*plen = 0;4035 4036	rqst.rq_iov = iov;4037	rqst.rq_nvec = 1;4038 4039	rc = SMB2_notify_init(xid, &rqst, tcon, server,4040			      persistent_fid, volatile_fid,4041			      completion_filter, watch_tree);4042	if (rc)4043		goto cnotify_exit;4044 4045	trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,4046				(u8)watch_tree, completion_filter);4047 4048	if (retries)4049		smb2_set_replay(server, &rqst);4050 4051	rc = cifs_send_recv(xid, ses, server,4052			    &rqst, &resp_buftype, flags, &rsp_iov);4053 4054	if (rc != 0) {4055		cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);4056		trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,4057				(u8)watch_tree, completion_filter, rc);4058	} else {4059		trace_smb3_notify_done(xid, persistent_fid, tcon->tid,4060			ses->Suid, (u8)watch_tree, completion_filter);4061		/* validate that notify information is plausible */4062		if ((rsp_iov.iov_base == NULL) ||4063		    (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))4064			goto cnotify_exit;4065 4066		smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;4067 4068		smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),4069				le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,4070				sizeof(struct file_notify_information));4071 4072		*out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),4073				le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);4074		if (*out_data == NULL) {4075			rc = -ENOMEM;4076			goto cnotify_exit;4077		} else if (plen)4078			*plen = le32_to_cpu(smb_rsp->OutputBufferLength);4079	}4080 4081 cnotify_exit:4082	if (rqst.rq_iov)4083		cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */4084	free_rsp_buf(resp_buftype, rsp_iov.iov_base);4085 4086	if (is_replayable_error(rc) &&4087	    smb2_should_replay(tcon, &retries, &cur_sleep))4088		goto replay_again;4089 4090	return rc;4091}4092 4093 4094 4095/*4096 * This is a no-op for now. We're not really interested in the reply, but4097 * rather in the fact that the server sent one and that server->lstrp4098 * gets updated.4099 *4100 * FIXME: maybe we should consider checking that the reply matches request?4101 */4102static void4103smb2_echo_callback(struct mid_q_entry *mid)4104{4105	struct TCP_Server_Info *server = mid->callback_data;4106	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;4107	struct cifs_credits credits = { .value = 0, .instance = 0 };4108 4109	if (mid->mid_state == MID_RESPONSE_RECEIVED4110	    || mid->mid_state == MID_RESPONSE_MALFORMED) {4111		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);4112		credits.instance = server->reconnect_instance;4113	}4114 4115	release_mid(mid);4116	add_credits(server, &credits, CIFS_ECHO_OP);4117}4118 4119void smb2_reconnect_server(struct work_struct *work)4120{4121	struct TCP_Server_Info *server = container_of(work,4122					struct TCP_Server_Info, reconnect.work);4123	struct TCP_Server_Info *pserver;4124	struct cifs_ses *ses, *ses2;4125	struct cifs_tcon *tcon, *tcon2;4126	struct list_head tmp_list, tmp_ses_list;4127	bool ses_exist = false;4128	bool tcon_selected = false;4129	int rc;4130	bool resched = false;4131 4132	/* first check if ref count has reached 0, if not inc ref count */4133	spin_lock(&cifs_tcp_ses_lock);4134	if (!server->srv_count) {4135		spin_unlock(&cifs_tcp_ses_lock);4136		return;4137	}4138	server->srv_count++;4139	spin_unlock(&cifs_tcp_ses_lock);4140 4141	/* If server is a channel, select the primary channel */4142	pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;4143 4144	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */4145	mutex_lock(&pserver->reconnect_mutex);4146 4147	/* if the server is marked for termination, drop the ref count here */4148	if (server->terminate) {4149		cifs_put_tcp_session(server, true);4150		mutex_unlock(&pserver->reconnect_mutex);4151		return;4152	}4153 4154	INIT_LIST_HEAD(&tmp_list);4155	INIT_LIST_HEAD(&tmp_ses_list);4156	cifs_dbg(FYI, "Reconnecting tcons and channels\n");4157 4158	spin_lock(&cifs_tcp_ses_lock);4159	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {4160		spin_lock(&ses->ses_lock);4161		if (ses->ses_status == SES_EXITING) {4162			spin_unlock(&ses->ses_lock);4163			continue;4164		}4165		spin_unlock(&ses->ses_lock);4166 4167		tcon_selected = false;4168 4169		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {4170			if (tcon->need_reconnect || tcon->need_reopen_files) {4171				tcon->tc_count++;4172				trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,4173						    netfs_trace_tcon_ref_get_reconnect_server);4174				list_add_tail(&tcon->rlist, &tmp_list);4175				tcon_selected = true;4176			}4177		}4178		/*4179		 * IPC has the same lifetime as its session and uses its4180		 * refcount.4181		 */4182		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {4183			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);4184			tcon_selected = true;4185			cifs_smb_ses_inc_refcount(ses);4186		}4187		/*4188		 * handle the case where channel needs to reconnect4189		 * binding session, but tcon is healthy (some other channel4190		 * is active)4191		 */4192		spin_lock(&ses->chan_lock);4193		if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {4194			list_add_tail(&ses->rlist, &tmp_ses_list);4195			ses_exist = true;4196			cifs_smb_ses_inc_refcount(ses);4197		}4198		spin_unlock(&ses->chan_lock);4199	}4200	spin_unlock(&cifs_tcp_ses_lock);4201 4202	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {4203		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);4204		if (!rc)4205			cifs_reopen_persistent_handles(tcon);4206		else4207			resched = true;4208		list_del_init(&tcon->rlist);4209		if (tcon->ipc)4210			cifs_put_smb_ses(tcon->ses);4211		else4212			cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);4213	}4214 4215	if (!ses_exist)4216		goto done;4217 4218	/* allocate a dummy tcon struct used for reconnect */4219	tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);4220	if (!tcon) {4221		resched = true;4222		list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {4223			list_del_init(&ses->rlist);4224			cifs_put_smb_ses(ses);4225		}4226		goto done;4227	}4228 4229	tcon->status = TID_GOOD;4230	tcon->retry = false;4231	tcon->need_reconnect = false;4232 4233	/* now reconnect sessions for necessary channels */4234	list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {4235		tcon->ses = ses;4236		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);4237		if (rc)4238			resched = true;4239		list_del_init(&ses->rlist);4240		cifs_put_smb_ses(ses);4241	}4242	tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);4243 4244done:4245	cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");4246	if (resched)4247		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);4248	mutex_unlock(&pserver->reconnect_mutex);4249 4250	/* now we can safely release srv struct */4251	cifs_put_tcp_session(server, true);4252}4253 4254int4255SMB2_echo(struct TCP_Server_Info *server)4256{4257	struct smb2_echo_req *req;4258	int rc = 0;4259	struct kvec iov[1];4260	struct smb_rqst rqst = { .rq_iov = iov,4261				 .rq_nvec = 1 };4262	unsigned int total_len;4263 4264	cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);4265 4266	spin_lock(&server->srv_lock);4267	if (server->ops->need_neg &&4268	    server->ops->need_neg(server)) {4269		spin_unlock(&server->srv_lock);4270		/* No need to send echo on newly established connections */4271		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);4272		return rc;4273	}4274	spin_unlock(&server->srv_lock);4275 4276	rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,4277				 (void **)&req, &total_len);4278	if (rc)4279		return rc;4280 4281	req->hdr.CreditRequest = cpu_to_le16(1);4282 4283	iov[0].iov_len = total_len;4284	iov[0].iov_base = (char *)req;4285 4286	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,4287			     server, CIFS_ECHO_OP, NULL);4288	if (rc)4289		cifs_dbg(FYI, "Echo request failed: %d\n", rc);4290 4291	cifs_small_buf_release(req);4292	return rc;4293}4294 4295void4296SMB2_flush_free(struct smb_rqst *rqst)4297{4298	if (rqst && rqst->rq_iov)4299		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */4300}4301 4302int4303SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,4304		struct cifs_tcon *tcon, struct TCP_Server_Info *server,4305		u64 persistent_fid, u64 volatile_fid)4306{4307	struct smb2_flush_req *req;4308	struct kvec *iov = rqst->rq_iov;4309	unsigned int total_len;4310	int rc;4311 4312	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,4313				 (void **) &req, &total_len);4314	if (rc)4315		return rc;4316 4317	req->PersistentFileId = persistent_fid;4318	req->VolatileFileId = volatile_fid;4319 4320	iov[0].iov_base = (char *)req;4321	iov[0].iov_len = total_len;4322 4323	return 0;4324}4325 4326int4327SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,4328	   u64 volatile_fid)4329{4330	struct cifs_ses *ses = tcon->ses;4331	struct smb_rqst rqst;4332	struct kvec iov[1];4333	struct kvec rsp_iov = {NULL, 0};4334	struct TCP_Server_Info *server;4335	int resp_buftype = CIFS_NO_BUFFER;4336	int flags = 0;4337	int rc = 0;4338	int retries = 0, cur_sleep = 1;4339 4340replay_again:4341	/* reinitialize for possible replay */4342	flags = 0;4343	server = cifs_pick_channel(ses);4344 4345	cifs_dbg(FYI, "flush\n");4346	if (!ses || !(ses->server))4347		return -EIO;4348 4349	if (smb3_encryption_required(tcon))4350		flags |= CIFS_TRANSFORM_REQ;4351 4352	memset(&rqst, 0, sizeof(struct smb_rqst));4353	memset(&iov, 0, sizeof(iov));4354	rqst.rq_iov = iov;4355	rqst.rq_nvec = 1;4356 4357	rc = SMB2_flush_init(xid, &rqst, tcon, server,4358			     persistent_fid, volatile_fid);4359	if (rc)4360		goto flush_exit;4361 4362	trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);4363 4364	if (retries)4365		smb2_set_replay(server, &rqst);4366 4367	rc = cifs_send_recv(xid, ses, server,4368			    &rqst, &resp_buftype, flags, &rsp_iov);4369 4370	if (rc != 0) {4371		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);4372		trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,4373				     rc);4374	} else4375		trace_smb3_flush_done(xid, persistent_fid, tcon->tid,4376				      ses->Suid);4377 4378 flush_exit:4379	SMB2_flush_free(&rqst);4380	free_rsp_buf(resp_buftype, rsp_iov.iov_base);4381 4382	if (is_replayable_error(rc) &&4383	    smb2_should_replay(tcon, &retries, &cur_sleep))4384		goto replay_again;4385 4386	return rc;4387}4388 4389#ifdef CONFIG_CIFS_SMB_DIRECT4390static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)4391{4392	struct TCP_Server_Info *server = io_parms->server;4393	struct cifs_tcon *tcon = io_parms->tcon;4394 4395	/* we can only offload if we're connected */4396	if (!server || !tcon)4397		return false;4398 4399	/* we can only offload on an rdma connection */4400	if (!server->rdma || !server->smbd_conn)4401		return false;4402 4403	/* we don't support signed offload yet */4404	if (server->sign)4405		return false;4406 4407	/* we don't support encrypted offload yet */4408	if (smb3_encryption_required(tcon))4409		return false;4410 4411	/* offload also has its overhead, so only do it if desired */4412	if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)4413		return false;4414 4415	return true;4416}4417#endif /* CONFIG_CIFS_SMB_DIRECT */4418 4419/*4420 * To form a chain of read requests, any read requests after the first should4421 * have the end_of_chain boolean set to true.4422 */4423static int4424smb2_new_read_req(void **buf, unsigned int *total_len,4425	struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,4426	unsigned int remaining_bytes, int request_type)4427{4428	int rc = -EACCES;4429	struct smb2_read_req *req = NULL;4430	struct smb2_hdr *shdr;4431	struct TCP_Server_Info *server = io_parms->server;4432 4433	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,4434				 (void **) &req, total_len);4435	if (rc)4436		return rc;4437 4438	if (server == NULL)4439		return -ECONNABORTED;4440 4441	shdr = &req->hdr;4442	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);4443 4444	req->PersistentFileId = io_parms->persistent_fid;4445	req->VolatileFileId = io_parms->volatile_fid;4446	req->ReadChannelInfoOffset = 0; /* reserved */4447	req->ReadChannelInfoLength = 0; /* reserved */4448	req->Channel = 0; /* reserved */4449	req->MinimumCount = 0;4450	req->Length = cpu_to_le32(io_parms->length);4451	req->Offset = cpu_to_le64(io_parms->offset);4452 4453	trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,4454			      rdata ? rdata->subreq.debug_index : 0,4455			      rdata ? rdata->xid : 0,4456			      io_parms->persistent_fid,4457			      io_parms->tcon->tid, io_parms->tcon->ses->Suid,4458			      io_parms->offset, io_parms->length);4459#ifdef CONFIG_CIFS_SMB_DIRECT4460	/*4461	 * If we want to do a RDMA write, fill in and append4462	 * smbd_buffer_descriptor_v1 to the end of read request4463	 */4464	if (rdata && smb3_use_rdma_offload(io_parms)) {4465		struct smbd_buffer_descriptor_v1 *v1;4466		bool need_invalidate = server->dialect == SMB30_PROT_ID;4467 4468		rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,4469					     true, need_invalidate);4470		if (!rdata->mr)4471			return -EAGAIN;4472 4473		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;4474		if (need_invalidate)4475			req->Channel = SMB2_CHANNEL_RDMA_V1;4476		req->ReadChannelInfoOffset =4477			cpu_to_le16(offsetof(struct smb2_read_req, Buffer));4478		req->ReadChannelInfoLength =4479			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));4480		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];4481		v1->offset = cpu_to_le64(rdata->mr->mr->iova);4482		v1->token = cpu_to_le32(rdata->mr->mr->rkey);4483		v1->length = cpu_to_le32(rdata->mr->mr->length);4484 4485		*total_len += sizeof(*v1) - 1;4486	}4487#endif4488	if (request_type & CHAINED_REQUEST) {4489		if (!(request_type & END_OF_CHAIN)) {4490			/* next 8-byte aligned request */4491			*total_len = ALIGN(*total_len, 8);4492			shdr->NextCommand = cpu_to_le32(*total_len);4493		} else /* END_OF_CHAIN */4494			shdr->NextCommand = 0;4495		if (request_type & RELATED_REQUEST) {4496			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;4497			/*4498			 * Related requests use info from previous read request4499			 * in chain.4500			 */4501			shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);4502			shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);4503			req->PersistentFileId = (u64)-1;4504			req->VolatileFileId = (u64)-1;4505		}4506	}4507	if (remaining_bytes > io_parms->length)4508		req->RemainingBytes = cpu_to_le32(remaining_bytes);4509	else4510		req->RemainingBytes = 0;4511 4512	*buf = req;4513	return rc;4514}4515 4516static void smb2_readv_worker(struct work_struct *work)4517{4518	struct cifs_io_subrequest *rdata =4519		container_of(work, struct cifs_io_subrequest, subreq.work);4520 4521	netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false);4522}4523 4524static void4525smb2_readv_callback(struct mid_q_entry *mid)4526{4527	struct cifs_io_subrequest *rdata = mid->callback_data;4528	struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);4529	struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);4530	struct TCP_Server_Info *server = rdata->server;4531	struct smb2_hdr *shdr =4532				(struct smb2_hdr *)rdata->iov[0].iov_base;4533	struct cifs_credits credits = {4534		.value = 0,4535		.instance = 0,4536		.rreq_debug_id = rdata->rreq->debug_id,4537		.rreq_debug_index = rdata->subreq.debug_index,4538	};4539	struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };4540	unsigned int rreq_debug_id = rdata->rreq->debug_id;4541	unsigned int subreq_debug_index = rdata->subreq.debug_index;4542 4543	if (rdata->got_bytes) {4544		rqst.rq_iter	  = rdata->subreq.io_iter;4545	}4546 4547	WARN_ONCE(rdata->server != mid->server,4548		  "rdata server %p != mid server %p",4549		  rdata->server, mid->server);4550 4551	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",4552		 __func__, mid->mid, mid->mid_state, rdata->result,4553		 rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);4554 4555	switch (mid->mid_state) {4556	case MID_RESPONSE_RECEIVED:4557		credits.value = le16_to_cpu(shdr->CreditRequest);4558		credits.instance = server->reconnect_instance;4559		/* result already set, check signature */4560		if (server->sign && !mid->decrypted) {4561			int rc;4562 4563			iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);4564			rc = smb2_verify_signature(&rqst, server);4565			if (rc)4566				cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",4567					 rc);4568		}4569		/* FIXME: should this be counted toward the initiating task? */4570		task_io_account_read(rdata->got_bytes);4571		cifs_stats_bytes_read(tcon, rdata->got_bytes);4572		break;4573	case MID_REQUEST_SUBMITTED:4574	case MID_RETRY_NEEDED:4575		__set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);4576		rdata->result = -EAGAIN;4577		if (server->sign && rdata->got_bytes)4578			/* reset bytes number since we can not check a sign */4579			rdata->got_bytes = 0;4580		/* FIXME: should this be counted toward the initiating task? */4581		task_io_account_read(rdata->got_bytes);4582		cifs_stats_bytes_read(tcon, rdata->got_bytes);4583		break;4584	case MID_RESPONSE_MALFORMED:4585		credits.value = le16_to_cpu(shdr->CreditRequest);4586		credits.instance = server->reconnect_instance;4587		fallthrough;4588	default:4589		rdata->result = -EIO;4590	}4591#ifdef CONFIG_CIFS_SMB_DIRECT4592	/*4593	 * If this rdata has a memory registered, the MR can be freed4594	 * MR needs to be freed as soon as I/O finishes to prevent deadlock4595	 * because they have limited number and are used for future I/Os4596	 */4597	if (rdata->mr) {4598		smbd_deregister_mr(rdata->mr);4599		rdata->mr = NULL;4600	}4601#endif4602	if (rdata->result && rdata->result != -ENODATA) {4603		cifs_stats_fail_inc(tcon, SMB2_READ_HE);4604		trace_smb3_read_err(rdata->rreq->debug_id,4605				    rdata->subreq.debug_index,4606				    rdata->xid,4607				    rdata->req->cfile->fid.persistent_fid,4608				    tcon->tid, tcon->ses->Suid,4609				    rdata->subreq.start + rdata->subreq.transferred,4610				    rdata->subreq.len   - rdata->subreq.transferred,4611				    rdata->result);4612	} else4613		trace_smb3_read_done(rdata->rreq->debug_id,4614				     rdata->subreq.debug_index,4615				     rdata->xid,4616				     rdata->req->cfile->fid.persistent_fid,4617				     tcon->tid, tcon->ses->Suid,4618				     rdata->subreq.start + rdata->subreq.transferred,4619				     rdata->got_bytes);4620 4621	if (rdata->result == -ENODATA) {4622		__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);4623		rdata->result = 0;4624	} else {4625		size_t trans = rdata->subreq.transferred + rdata->got_bytes;4626		if (trans < rdata->subreq.len &&4627		    rdata->subreq.start + trans == ictx->remote_i_size) {4628			__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);4629			rdata->result = 0;4630		}4631	}4632	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,4633			      server->credits, server->in_flight,4634			      0, cifs_trace_rw_credits_read_response_clear);4635	rdata->credits.value = 0;4636	rdata->subreq.transferred += rdata->got_bytes;4637	trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);4638	INIT_WORK(&rdata->subreq.work, smb2_readv_worker);4639	queue_work(cifsiod_wq, &rdata->subreq.work);4640	release_mid(mid);4641	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,4642			      server->credits, server->in_flight,4643			      credits.value, cifs_trace_rw_credits_read_response_add);4644	add_credits(server, &credits, 0);4645}4646 4647/* smb2_async_readv - send an async read, and set up mid to handle result */4648int4649smb2_async_readv(struct cifs_io_subrequest *rdata)4650{4651	int rc, flags = 0;4652	char *buf;4653	struct netfs_io_subrequest *subreq = &rdata->subreq;4654	struct smb2_hdr *shdr;4655	struct cifs_io_parms io_parms;4656	struct smb_rqst rqst = { .rq_iov = rdata->iov,4657				 .rq_nvec = 1 };4658	struct TCP_Server_Info *server;4659	struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);4660	unsigned int total_len;4661	int credit_request;4662 4663	cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",4664		 __func__, subreq->start, subreq->len);4665 4666	if (!rdata->server)4667		rdata->server = cifs_pick_channel(tcon->ses);4668 4669	io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);4670	io_parms.server = server = rdata->server;4671	io_parms.offset = subreq->start + subreq->transferred;4672	io_parms.length = subreq->len   - subreq->transferred;4673	io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;4674	io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;4675	io_parms.pid = rdata->req->pid;4676 4677	rc = smb2_new_read_req(4678		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);4679	if (rc)4680		return rc;4681 4682	if (smb3_encryption_required(io_parms.tcon))4683		flags |= CIFS_TRANSFORM_REQ;4684 4685	rdata->iov[0].iov_base = buf;4686	rdata->iov[0].iov_len = total_len;4687	rdata->got_bytes = 0;4688	rdata->result = 0;4689 4690	shdr = (struct smb2_hdr *)buf;4691 4692	if (rdata->credits.value > 0) {4693		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,4694						SMB2_MAX_BUFFER_SIZE));4695		credit_request = le16_to_cpu(shdr->CreditCharge) + 8;4696		if (server->credits >= server->max_credits)4697			shdr->CreditRequest = cpu_to_le16(0);4698		else4699			shdr->CreditRequest = cpu_to_le16(4700				min_t(int, server->max_credits -4701						server->credits, credit_request));4702 4703		rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);4704		if (rc)4705			goto async_readv_out;4706 4707		flags |= CIFS_HAS_CREDITS;4708	}4709 4710	rc = cifs_call_async(server, &rqst,4711			     cifs_readv_receive, smb2_readv_callback,4712			     smb3_handle_read_data, rdata, flags,4713			     &rdata->credits);4714	if (rc) {4715		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);4716		trace_smb3_read_err(rdata->rreq->debug_id,4717				    subreq->debug_index,4718				    rdata->xid, io_parms.persistent_fid,4719				    io_parms.tcon->tid,4720				    io_parms.tcon->ses->Suid,4721				    io_parms.offset,4722				    subreq->len - subreq->transferred, rc);4723	}4724 4725async_readv_out:4726	cifs_small_buf_release(buf);4727	return rc;4728}4729 4730int4731SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,4732	  unsigned int *nbytes, char **buf, int *buf_type)4733{4734	struct smb_rqst rqst;4735	int resp_buftype, rc;4736	struct smb2_read_req *req = NULL;4737	struct smb2_read_rsp *rsp = NULL;4738	struct kvec iov[1];4739	struct kvec rsp_iov;4740	unsigned int total_len;4741	int flags = CIFS_LOG_ERROR;4742	struct cifs_ses *ses = io_parms->tcon->ses;4743 4744	if (!io_parms->server)4745		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);4746 4747	*nbytes = 0;4748	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);4749	if (rc)4750		return rc;4751 4752	if (smb3_encryption_required(io_parms->tcon))4753		flags |= CIFS_TRANSFORM_REQ;4754 4755	iov[0].iov_base = (char *)req;4756	iov[0].iov_len = total_len;4757 4758	memset(&rqst, 0, sizeof(struct smb_rqst));4759	rqst.rq_iov = iov;4760	rqst.rq_nvec = 1;4761 4762	rc = cifs_send_recv(xid, ses, io_parms->server,4763			    &rqst, &resp_buftype, flags, &rsp_iov);4764	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;4765 4766	if (rc) {4767		if (rc != -ENODATA) {4768			cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);4769			cifs_dbg(VFS, "Send error in read = %d\n", rc);4770			trace_smb3_read_err(0, 0, xid,4771					    req->PersistentFileId,4772					    io_parms->tcon->tid, ses->Suid,4773					    io_parms->offset, io_parms->length,4774					    rc);4775		} else4776			trace_smb3_read_done(0, 0, xid,4777					     req->PersistentFileId, io_parms->tcon->tid,4778					     ses->Suid, io_parms->offset, 0);4779		free_rsp_buf(resp_buftype, rsp_iov.iov_base);4780		cifs_small_buf_release(req);4781		return rc == -ENODATA ? 0 : rc;4782	} else4783		trace_smb3_read_done(0, 0, xid,4784				     req->PersistentFileId,4785				     io_parms->tcon->tid, ses->Suid,4786				     io_parms->offset, io_parms->length);4787 4788	cifs_small_buf_release(req);4789 4790	*nbytes = le32_to_cpu(rsp->DataLength);4791	if ((*nbytes > CIFS_MAX_MSGSIZE) ||4792	    (*nbytes > io_parms->length)) {4793		cifs_dbg(FYI, "bad length %d for count %d\n",4794			 *nbytes, io_parms->length);4795		rc = -EIO;4796		*nbytes = 0;4797	}4798 4799	if (*buf) {4800		memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);4801		free_rsp_buf(resp_buftype, rsp_iov.iov_base);4802	} else if (resp_buftype != CIFS_NO_BUFFER) {4803		*buf = rsp_iov.iov_base;4804		if (resp_buftype == CIFS_SMALL_BUFFER)4805			*buf_type = CIFS_SMALL_BUFFER;4806		else if (resp_buftype == CIFS_LARGE_BUFFER)4807			*buf_type = CIFS_LARGE_BUFFER;4808	}4809	return rc;4810}4811 4812/*4813 * Check the mid_state and signature on received buffer (if any), and queue the4814 * workqueue completion task.4815 */4816static void4817smb2_writev_callback(struct mid_q_entry *mid)4818{4819	struct cifs_io_subrequest *wdata = mid->callback_data;4820	struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);4821	struct TCP_Server_Info *server = wdata->server;4822	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;4823	struct cifs_credits credits = {4824		.value = 0,4825		.instance = 0,4826		.rreq_debug_id = wdata->rreq->debug_id,4827		.rreq_debug_index = wdata->subreq.debug_index,4828	};4829	unsigned int rreq_debug_id = wdata->rreq->debug_id;4830	unsigned int subreq_debug_index = wdata->subreq.debug_index;4831	ssize_t result = 0;4832	size_t written;4833 4834	WARN_ONCE(wdata->server != mid->server,4835		  "wdata server %p != mid server %p",4836		  wdata->server, mid->server);4837 4838	switch (mid->mid_state) {4839	case MID_RESPONSE_RECEIVED:4840		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);4841		credits.instance = server->reconnect_instance;4842		result = smb2_check_receive(mid, server, 0);4843		if (result != 0)4844			break;4845 4846		written = le32_to_cpu(rsp->DataLength);4847		/*4848		 * Mask off high 16 bits when bytes written as returned4849		 * by the server is greater than bytes requested by the4850		 * client. OS/2 servers are known to set incorrect4851		 * CountHigh values.4852		 */4853		if (written > wdata->subreq.len)4854			written &= 0xFFFF;4855 4856		if (written < wdata->subreq.len)4857			wdata->result = -ENOSPC;4858		else4859			wdata->subreq.len = written;4860		break;4861	case MID_REQUEST_SUBMITTED:4862	case MID_RETRY_NEEDED:4863		result = -EAGAIN;4864		break;4865	case MID_RESPONSE_MALFORMED:4866		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);4867		credits.instance = server->reconnect_instance;4868		fallthrough;4869	default:4870		result = -EIO;4871		break;4872	}4873#ifdef CONFIG_CIFS_SMB_DIRECT4874	/*4875	 * If this wdata has a memory registered, the MR can be freed4876	 * The number of MRs available is limited, it's important to recover4877	 * used MR as soon as I/O is finished. Hold MR longer in the later4878	 * I/O process can possibly result in I/O deadlock due to lack of MR4879	 * to send request on I/O retry4880	 */4881	if (wdata->mr) {4882		smbd_deregister_mr(wdata->mr);4883		wdata->mr = NULL;4884	}4885#endif4886	if (result) {4887		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);4888		trace_smb3_write_err(wdata->rreq->debug_id,4889				     wdata->subreq.debug_index,4890				     wdata->xid,4891				     wdata->req->cfile->fid.persistent_fid,4892				     tcon->tid, tcon->ses->Suid, wdata->subreq.start,4893				     wdata->subreq.len, wdata->result);4894		if (wdata->result == -ENOSPC)4895			pr_warn_once("Out of space writing to %s\n",4896				     tcon->tree_name);4897	} else4898		trace_smb3_write_done(wdata->rreq->debug_id,4899				      wdata->subreq.debug_index,4900				      wdata->xid,4901				      wdata->req->cfile->fid.persistent_fid,4902				      tcon->tid, tcon->ses->Suid,4903				      wdata->subreq.start, wdata->subreq.len);4904 4905	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,4906			      server->credits, server->in_flight,4907			      0, cifs_trace_rw_credits_write_response_clear);4908	wdata->credits.value = 0;4909	trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);4910	cifs_write_subrequest_terminated(wdata, result ?: written, true);4911	release_mid(mid);4912	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,4913			      server->credits, server->in_flight,4914			      credits.value, cifs_trace_rw_credits_write_response_add);4915	add_credits(server, &credits, 0);4916}4917 4918/* smb2_async_writev - send an async write, and set up mid to handle result */4919void4920smb2_async_writev(struct cifs_io_subrequest *wdata)4921{4922	int rc = -EACCES, flags = 0;4923	struct smb2_write_req *req = NULL;4924	struct smb2_hdr *shdr;4925	struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);4926	struct TCP_Server_Info *server = wdata->server;4927	struct kvec iov[1];4928	struct smb_rqst rqst = { };4929	unsigned int total_len, xid = wdata->xid;4930	struct cifs_io_parms _io_parms;4931	struct cifs_io_parms *io_parms = NULL;4932	int credit_request;4933 4934	/*4935	 * in future we may get cifs_io_parms passed in from the caller,4936	 * but for now we construct it here...4937	 */4938	_io_parms = (struct cifs_io_parms) {4939		.tcon = tcon,4940		.server = server,4941		.offset = wdata->subreq.start,4942		.length = wdata->subreq.len,4943		.persistent_fid = wdata->req->cfile->fid.persistent_fid,4944		.volatile_fid = wdata->req->cfile->fid.volatile_fid,4945		.pid = wdata->req->pid,4946	};4947	io_parms = &_io_parms;4948 4949	rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,4950				 (void **) &req, &total_len);4951	if (rc)4952		goto out;4953 4954	rqst.rq_iov = iov;4955	rqst.rq_iter = wdata->subreq.io_iter;4956 4957	rqst.rq_iov[0].iov_len = total_len - 1;4958	rqst.rq_iov[0].iov_base = (char *)req;4959	rqst.rq_nvec += 1;4960 4961	if (smb3_encryption_required(tcon))4962		flags |= CIFS_TRANSFORM_REQ;4963 4964	shdr = (struct smb2_hdr *)req;4965	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);4966 4967	req->PersistentFileId = io_parms->persistent_fid;4968	req->VolatileFileId = io_parms->volatile_fid;4969	req->WriteChannelInfoOffset = 0;4970	req->WriteChannelInfoLength = 0;4971	req->Channel = SMB2_CHANNEL_NONE;4972	req->Length = cpu_to_le32(io_parms->length);4973	req->Offset = cpu_to_le64(io_parms->offset);4974	req->DataOffset = cpu_to_le16(4975				offsetof(struct smb2_write_req, Buffer));4976	req->RemainingBytes = 0;4977 4978	trace_smb3_write_enter(wdata->rreq->debug_id,4979			       wdata->subreq.debug_index,4980			       wdata->xid,4981			       io_parms->persistent_fid,4982			       io_parms->tcon->tid,4983			       io_parms->tcon->ses->Suid,4984			       io_parms->offset,4985			       io_parms->length);4986 4987#ifdef CONFIG_CIFS_SMB_DIRECT4988	/*4989	 * If we want to do a server RDMA read, fill in and append4990	 * smbd_buffer_descriptor_v1 to the end of write request4991	 */4992	if (smb3_use_rdma_offload(io_parms)) {4993		struct smbd_buffer_descriptor_v1 *v1;4994		bool need_invalidate = server->dialect == SMB30_PROT_ID;4995 4996		wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,4997					     false, need_invalidate);4998		if (!wdata->mr) {4999			rc = -EAGAIN;5000			goto async_writev_out;5001		}5002		/* For RDMA read, I/O size is in RemainingBytes not in Length */5003		req->RemainingBytes = req->Length;5004		req->Length = 0;5005		req->DataOffset = 0;5006		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;5007		if (need_invalidate)5008			req->Channel = SMB2_CHANNEL_RDMA_V1;5009		req->WriteChannelInfoOffset =5010			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));5011		req->WriteChannelInfoLength =5012			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));5013		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];5014		v1->offset = cpu_to_le64(wdata->mr->mr->iova);5015		v1->token = cpu_to_le32(wdata->mr->mr->rkey);5016		v1->length = cpu_to_le32(wdata->mr->mr->length);5017 5018		rqst.rq_iov[0].iov_len += sizeof(*v1);5019 5020		/*5021		 * We keep wdata->subreq.io_iter,5022		 * but we have to truncate rqst.rq_iter5023		 */5024		iov_iter_truncate(&rqst.rq_iter, 0);5025	}5026#endif5027 5028	if (test_bit(NETFS_SREQ_RETRYING, &wdata->subreq.flags))5029		smb2_set_replay(server, &rqst);5030 5031	cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",5032		 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));5033 5034	if (wdata->credits.value > 0) {5035		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,5036						    SMB2_MAX_BUFFER_SIZE));5037		credit_request = le16_to_cpu(shdr->CreditCharge) + 8;5038		if (server->credits >= server->max_credits)5039			shdr->CreditRequest = cpu_to_le16(0);5040		else5041			shdr->CreditRequest = cpu_to_le16(5042				min_t(int, server->max_credits -5043						server->credits, credit_request));5044 5045		rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);5046		if (rc)5047			goto async_writev_out;5048 5049		flags |= CIFS_HAS_CREDITS;5050	}5051 5052	/* XXX: compression + encryption is unsupported for now */5053	if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))5054		flags |= CIFS_COMPRESS_REQ;5055 5056	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,5057			     wdata, flags, &wdata->credits);5058	/* Can't touch wdata if rc == 0 */5059	if (rc) {5060		trace_smb3_write_err(wdata->rreq->debug_id,5061				     wdata->subreq.debug_index,5062				     xid,5063				     io_parms->persistent_fid,5064				     io_parms->tcon->tid,5065				     io_parms->tcon->ses->Suid,5066				     io_parms->offset,5067				     io_parms->length,5068				     rc);5069		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);5070	}5071 5072async_writev_out:5073	cifs_small_buf_release(req);5074out:5075	if (rc) {5076		trace_smb3_rw_credits(wdata->rreq->debug_id,5077				      wdata->subreq.debug_index,5078				      wdata->credits.value,5079				      server->credits, server->in_flight,5080				      -(int)wdata->credits.value,5081				      cifs_trace_rw_credits_write_response_clear);5082		add_credits_and_wake_if(wdata->server, &wdata->credits, 0);5083		cifs_write_subrequest_terminated(wdata, rc, true);5084	}5085}5086 5087/*5088 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.5089 * The length field from io_parms must be at least 1 and indicates a number of5090 * elements with data to write that begins with position 1 in iov array. All5091 * data length is specified by count.5092 */5093int5094SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,5095	   unsigned int *nbytes, struct kvec *iov, int n_vec)5096{5097	struct smb_rqst rqst;5098	int rc = 0;5099	struct smb2_write_req *req = NULL;5100	struct smb2_write_rsp *rsp = NULL;5101	int resp_buftype;5102	struct kvec rsp_iov;5103	int flags = 0;5104	unsigned int total_len;5105	struct TCP_Server_Info *server;5106	int retries = 0, cur_sleep = 1;5107 5108replay_again:5109	/* reinitialize for possible replay */5110	flags = 0;5111	*nbytes = 0;5112	if (!io_parms->server)5113		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);5114	server = io_parms->server;5115	if (server == NULL)5116		return -ECONNABORTED;5117 5118	if (n_vec < 1)5119		return rc;5120 5121	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,5122				 (void **) &req, &total_len);5123	if (rc)5124		return rc;5125 5126	if (smb3_encryption_required(io_parms->tcon))5127		flags |= CIFS_TRANSFORM_REQ;5128 5129	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);5130 5131	req->PersistentFileId = io_parms->persistent_fid;5132	req->VolatileFileId = io_parms->volatile_fid;5133	req->WriteChannelInfoOffset = 0;5134	req->WriteChannelInfoLength = 0;5135	req->Channel = 0;5136	req->Length = cpu_to_le32(io_parms->length);5137	req->Offset = cpu_to_le64(io_parms->offset);5138	req->DataOffset = cpu_to_le16(5139				offsetof(struct smb2_write_req, Buffer));5140	req->RemainingBytes = 0;5141 5142	trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,5143		io_parms->tcon->tid, io_parms->tcon->ses->Suid,5144		io_parms->offset, io_parms->length);5145 5146	iov[0].iov_base = (char *)req;5147	/* 1 for Buffer */5148	iov[0].iov_len = total_len - 1;5149 5150	memset(&rqst, 0, sizeof(struct smb_rqst));5151	rqst.rq_iov = iov;5152	rqst.rq_nvec = n_vec + 1;5153 5154	if (retries)5155		smb2_set_replay(server, &rqst);5156 5157	rc = cifs_send_recv(xid, io_parms->tcon->ses, server,5158			    &rqst,5159			    &resp_buftype, flags, &rsp_iov);5160	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;5161 5162	if (rc) {5163		trace_smb3_write_err(0, 0, xid,5164				     req->PersistentFileId,5165				     io_parms->tcon->tid,5166				     io_parms->tcon->ses->Suid,5167				     io_parms->offset, io_parms->length, rc);5168		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);5169		cifs_dbg(VFS, "Send error in write = %d\n", rc);5170	} else {5171		*nbytes = le32_to_cpu(rsp->DataLength);5172		trace_smb3_write_done(0, 0, xid,5173				      req->PersistentFileId,5174				      io_parms->tcon->tid,5175				      io_parms->tcon->ses->Suid,5176				      io_parms->offset, *nbytes);5177	}5178 5179	cifs_small_buf_release(req);5180	free_rsp_buf(resp_buftype, rsp);5181 5182	if (is_replayable_error(rc) &&5183	    smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))5184		goto replay_again;5185 5186	return rc;5187}5188 5189int posix_info_sid_size(const void *beg, const void *end)5190{5191	size_t subauth;5192	int total;5193 5194	if (beg + 1 > end)5195		return -1;5196 5197	subauth = *(u8 *)(beg+1);5198	if (subauth < 1 || subauth > 15)5199		return -1;5200 5201	total = 1 + 1 + 6 + 4*subauth;5202	if (beg + total > end)5203		return -1;5204 5205	return total;5206}5207 5208int posix_info_parse(const void *beg, const void *end,5209		     struct smb2_posix_info_parsed *out)5210 5211{5212	int total_len = 0;5213	int owner_len, group_len;5214	int name_len;5215	const void *owner_sid;5216	const void *group_sid;5217	const void *name;5218 5219	/* if no end bound given, assume payload to be correct */5220	if (!end) {5221		const struct smb2_posix_info *p = beg;5222 5223		end = beg + le32_to_cpu(p->NextEntryOffset);5224		/* last element will have a 0 offset, pick a sensible bound */5225		if (end == beg)5226			end += 0xFFFF;5227	}5228 5229	/* check base buf */5230	if (beg + sizeof(struct smb2_posix_info) > end)5231		return -1;5232	total_len = sizeof(struct smb2_posix_info);5233 5234	/* check owner sid */5235	owner_sid = beg + total_len;5236	owner_len = posix_info_sid_size(owner_sid, end);5237	if (owner_len < 0)5238		return -1;5239	total_len += owner_len;5240 5241	/* check group sid */5242	group_sid = beg + total_len;5243	group_len = posix_info_sid_size(group_sid, end);5244	if (group_len < 0)5245		return -1;5246	total_len += group_len;5247 5248	/* check name len */5249	if (beg + total_len + 4 > end)5250		return -1;5251	name_len = le32_to_cpu(*(__le32 *)(beg + total_len));5252	if (name_len < 1 || name_len > 0xFFFF)5253		return -1;5254	total_len += 4;5255 5256	/* check name */5257	name = beg + total_len;5258	if (name + name_len > end)5259		return -1;5260	total_len += name_len;5261 5262	if (out) {5263		out->base = beg;5264		out->size = total_len;5265		out->name_len = name_len;5266		out->name = name;5267		memcpy(&out->owner, owner_sid, owner_len);5268		memcpy(&out->group, group_sid, group_len);5269	}5270	return total_len;5271}5272 5273static int posix_info_extra_size(const void *beg, const void *end)5274{5275	int len = posix_info_parse(beg, end, NULL);5276 5277	if (len < 0)5278		return -1;5279	return len - sizeof(struct smb2_posix_info);5280}5281 5282static unsigned int5283num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,5284	    size_t size)5285{5286	int len;5287	unsigned int entrycount = 0;5288	unsigned int next_offset = 0;5289	char *entryptr;5290	FILE_DIRECTORY_INFO *dir_info;5291 5292	if (bufstart == NULL)5293		return 0;5294 5295	entryptr = bufstart;5296 5297	while (1) {5298		if (entryptr + next_offset < entryptr ||5299		    entryptr + next_offset > end_of_buf ||5300		    entryptr + next_offset + size > end_of_buf) {5301			cifs_dbg(VFS, "malformed search entry would overflow\n");5302			break;5303		}5304 5305		entryptr = entryptr + next_offset;5306		dir_info = (FILE_DIRECTORY_INFO *)entryptr;5307 5308		if (infotype == SMB_FIND_FILE_POSIX_INFO)5309			len = posix_info_extra_size(entryptr, end_of_buf);5310		else5311			len = le32_to_cpu(dir_info->FileNameLength);5312 5313		if (len < 0 ||5314		    entryptr + len < entryptr ||5315		    entryptr + len > end_of_buf ||5316		    entryptr + len + size > end_of_buf) {5317			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",5318				 end_of_buf);5319			break;5320		}5321 5322		*lastentry = entryptr;5323		entrycount++;5324 5325		next_offset = le32_to_cpu(dir_info->NextEntryOffset);5326		if (!next_offset)5327			break;5328	}5329 5330	return entrycount;5331}5332 5333/*5334 * Readdir/FindFirst5335 */5336int SMB2_query_directory_init(const unsigned int xid,5337			      struct cifs_tcon *tcon,5338			      struct TCP_Server_Info *server,5339			      struct smb_rqst *rqst,5340			      u64 persistent_fid, u64 volatile_fid,5341			      int index, int info_level)5342{5343	struct smb2_query_directory_req *req;5344	unsigned char *bufptr;5345	__le16 asteriks = cpu_to_le16('*');5346	unsigned int output_size = CIFSMaxBufSize -5347		MAX_SMB2_CREATE_RESPONSE_SIZE -5348		MAX_SMB2_CLOSE_RESPONSE_SIZE;5349	unsigned int total_len;5350	struct kvec *iov = rqst->rq_iov;5351	int len, rc;5352 5353	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,5354				 (void **) &req, &total_len);5355	if (rc)5356		return rc;5357 5358	switch (info_level) {5359	case SMB_FIND_FILE_DIRECTORY_INFO:5360		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;5361		break;5362	case SMB_FIND_FILE_ID_FULL_DIR_INFO:5363		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;5364		break;5365	case SMB_FIND_FILE_POSIX_INFO:5366		req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;5367		break;5368	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:5369		req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;5370		break;5371	default:5372		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",5373			info_level);5374		return -EINVAL;5375	}5376 5377	req->FileIndex = cpu_to_le32(index);5378	req->PersistentFileId = persistent_fid;5379	req->VolatileFileId = volatile_fid;5380 5381	len = 0x2;5382	bufptr = req->Buffer;5383	memcpy(bufptr, &asteriks, len);5384 5385	req->FileNameOffset =5386		cpu_to_le16(sizeof(struct smb2_query_directory_req));5387	req->FileNameLength = cpu_to_le16(len);5388	/*5389	 * BB could be 30 bytes or so longer if we used SMB2 specific5390	 * buffer lengths, but this is safe and close enough.5391	 */5392	output_size = min_t(unsigned int, output_size, server->maxBuf);5393	output_size = min_t(unsigned int, output_size, 2 << 15);5394	req->OutputBufferLength = cpu_to_le32(output_size);5395 5396	iov[0].iov_base = (char *)req;5397	/* 1 for Buffer */5398	iov[0].iov_len = total_len - 1;5399 5400	iov[1].iov_base = (char *)(req->Buffer);5401	iov[1].iov_len = len;5402 5403	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,5404			tcon->ses->Suid, index, output_size);5405 5406	return 0;5407}5408 5409void SMB2_query_directory_free(struct smb_rqst *rqst)5410{5411	if (rqst && rqst->rq_iov) {5412		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */5413	}5414}5415 5416int5417smb2_parse_query_directory(struct cifs_tcon *tcon,5418			   struct kvec *rsp_iov,5419			   int resp_buftype,5420			   struct cifs_search_info *srch_inf)5421{5422	struct smb2_query_directory_rsp *rsp;5423	size_t info_buf_size;5424	char *end_of_smb;5425	int rc;5426 5427	rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;5428 5429	switch (srch_inf->info_level) {5430	case SMB_FIND_FILE_DIRECTORY_INFO:5431		info_buf_size = sizeof(FILE_DIRECTORY_INFO);5432		break;5433	case SMB_FIND_FILE_ID_FULL_DIR_INFO:5434		info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);5435		break;5436	case SMB_FIND_FILE_POSIX_INFO:5437		/* note that posix payload are variable size */5438		info_buf_size = sizeof(struct smb2_posix_info);5439		break;5440	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:5441		info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);5442		break;5443	default:5444		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",5445			 srch_inf->info_level);5446		return -EINVAL;5447	}5448 5449	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),5450			       le32_to_cpu(rsp->OutputBufferLength), rsp_iov,5451			       info_buf_size);5452	if (rc) {5453		cifs_tcon_dbg(VFS, "bad info payload");5454		return rc;5455	}5456 5457	srch_inf->unicode = true;5458 5459	if (srch_inf->ntwrk_buf_start) {5460		if (srch_inf->smallBuf)5461			cifs_small_buf_release(srch_inf->ntwrk_buf_start);5462		else5463			cifs_buf_release(srch_inf->ntwrk_buf_start);5464	}5465	srch_inf->ntwrk_buf_start = (char *)rsp;5466	srch_inf->srch_entries_start = srch_inf->last_entry =5467		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);5468	end_of_smb = rsp_iov->iov_len + (char *)rsp;5469 5470	srch_inf->entries_in_buffer = num_entries(5471		srch_inf->info_level,5472		srch_inf->srch_entries_start,5473		end_of_smb,5474		&srch_inf->last_entry,5475		info_buf_size);5476 5477	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;5478	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",5479		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,5480		 srch_inf->srch_entries_start, srch_inf->last_entry);5481	if (resp_buftype == CIFS_LARGE_BUFFER)5482		srch_inf->smallBuf = false;5483	else if (resp_buftype == CIFS_SMALL_BUFFER)5484		srch_inf->smallBuf = true;5485	else5486		cifs_tcon_dbg(VFS, "Invalid search buffer type\n");5487 5488	return 0;5489}5490 5491int5492SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,5493		     u64 persistent_fid, u64 volatile_fid, int index,5494		     struct cifs_search_info *srch_inf)5495{5496	struct smb_rqst rqst;5497	struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];5498	struct smb2_query_directory_rsp *rsp = NULL;5499	int resp_buftype = CIFS_NO_BUFFER;5500	struct kvec rsp_iov;5501	int rc = 0;5502	struct cifs_ses *ses = tcon->ses;5503	struct TCP_Server_Info *server;5504	int flags = 0;5505	int retries = 0, cur_sleep = 1;5506 5507replay_again:5508	/* reinitialize for possible replay */5509	flags = 0;5510	server = cifs_pick_channel(ses);5511 5512	if (!ses || !(ses->server))5513		return -EIO;5514 5515	if (smb3_encryption_required(tcon))5516		flags |= CIFS_TRANSFORM_REQ;5517 5518	memset(&rqst, 0, sizeof(struct smb_rqst));5519	memset(&iov, 0, sizeof(iov));5520	rqst.rq_iov = iov;5521	rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;5522 5523	rc = SMB2_query_directory_init(xid, tcon, server,5524				       &rqst, persistent_fid,5525				       volatile_fid, index,5526				       srch_inf->info_level);5527	if (rc)5528		goto qdir_exit;5529 5530	if (retries)5531		smb2_set_replay(server, &rqst);5532 5533	rc = cifs_send_recv(xid, ses, server,5534			    &rqst, &resp_buftype, flags, &rsp_iov);5535	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;5536 5537	if (rc) {5538		if (rc == -ENODATA &&5539		    rsp->hdr.Status == STATUS_NO_MORE_FILES) {5540			trace_smb3_query_dir_done(xid, persistent_fid,5541				tcon->tid, tcon->ses->Suid, index, 0);5542			srch_inf->endOfSearch = true;5543			rc = 0;5544		} else {5545			trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,5546				tcon->ses->Suid, index, 0, rc);5547			cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);5548		}5549		goto qdir_exit;5550	}5551 5552	rc = smb2_parse_query_directory(tcon, &rsp_iov,	resp_buftype,5553					srch_inf);5554	if (rc) {5555		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,5556			tcon->ses->Suid, index, 0, rc);5557		goto qdir_exit;5558	}5559	resp_buftype = CIFS_NO_BUFFER;5560 5561	trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,5562			tcon->ses->Suid, index, srch_inf->entries_in_buffer);5563 5564qdir_exit:5565	SMB2_query_directory_free(&rqst);5566	free_rsp_buf(resp_buftype, rsp);5567 5568	if (is_replayable_error(rc) &&5569	    smb2_should_replay(tcon, &retries, &cur_sleep))5570		goto replay_again;5571 5572	return rc;5573}5574 5575int5576SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,5577		   struct smb_rqst *rqst,5578		   u64 persistent_fid, u64 volatile_fid, u32 pid,5579		   u8 info_class, u8 info_type, u32 additional_info,5580		   void **data, unsigned int *size)5581{5582	struct smb2_set_info_req *req;5583	struct kvec *iov = rqst->rq_iov;5584	unsigned int i, total_len;5585	int rc;5586 5587	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,5588				 (void **) &req, &total_len);5589	if (rc)5590		return rc;5591 5592	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);5593	req->InfoType = info_type;5594	req->FileInfoClass = info_class;5595	req->PersistentFileId = persistent_fid;5596	req->VolatileFileId = volatile_fid;5597	req->AdditionalInformation = cpu_to_le32(additional_info);5598 5599	req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));5600	req->BufferLength = cpu_to_le32(*size);5601 5602	memcpy(req->Buffer, *data, *size);5603	total_len += *size;5604 5605	iov[0].iov_base = (char *)req;5606	/* 1 for Buffer */5607	iov[0].iov_len = total_len - 1;5608 5609	for (i = 1; i < rqst->rq_nvec; i++) {5610		le32_add_cpu(&req->BufferLength, size[i]);5611		iov[i].iov_base = (char *)data[i];5612		iov[i].iov_len = size[i];5613	}5614 5615	return 0;5616}5617 5618void5619SMB2_set_info_free(struct smb_rqst *rqst)5620{5621	if (rqst && rqst->rq_iov)5622		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */5623}5624 5625static int5626send_set_info(const unsigned int xid, struct cifs_tcon *tcon,5627	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,5628	       u8 info_type, u32 additional_info, unsigned int num,5629		void **data, unsigned int *size)5630{5631	struct smb_rqst rqst;5632	struct smb2_set_info_rsp *rsp = NULL;5633	struct kvec *iov;5634	struct kvec rsp_iov;5635	int rc = 0;5636	int resp_buftype;5637	struct cifs_ses *ses = tcon->ses;5638	struct TCP_Server_Info *server;5639	int flags = 0;5640	int retries = 0, cur_sleep = 1;5641 5642replay_again:5643	/* reinitialize for possible replay */5644	flags = 0;5645	server = cifs_pick_channel(ses);5646 5647	if (!ses || !server)5648		return -EIO;5649 5650	if (!num)5651		return -EINVAL;5652 5653	if (smb3_encryption_required(tcon))5654		flags |= CIFS_TRANSFORM_REQ;5655 5656	iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);5657	if (!iov)5658		return -ENOMEM;5659 5660	memset(&rqst, 0, sizeof(struct smb_rqst));5661	rqst.rq_iov = iov;5662	rqst.rq_nvec = num;5663 5664	rc = SMB2_set_info_init(tcon, server,5665				&rqst, persistent_fid, volatile_fid, pid,5666				info_class, info_type, additional_info,5667				data, size);5668	if (rc) {5669		kfree(iov);5670		return rc;5671	}5672 5673	if (retries)5674		smb2_set_replay(server, &rqst);5675 5676	rc = cifs_send_recv(xid, ses, server,5677			    &rqst, &resp_buftype, flags,5678			    &rsp_iov);5679	SMB2_set_info_free(&rqst);5680	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;5681 5682	if (rc != 0) {5683		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);5684		trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,5685				ses->Suid, info_class, (__u32)info_type, rc);5686	}5687 5688	free_rsp_buf(resp_buftype, rsp);5689	kfree(iov);5690 5691	if (is_replayable_error(rc) &&5692	    smb2_should_replay(tcon, &retries, &cur_sleep))5693		goto replay_again;5694 5695	return rc;5696}5697 5698int5699SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,5700	     u64 volatile_fid, u32 pid, loff_t new_eof)5701{5702	struct smb2_file_eof_info info;5703	void *data;5704	unsigned int size;5705 5706	info.EndOfFile = cpu_to_le64(new_eof);5707 5708	data = &info;5709	size = sizeof(struct smb2_file_eof_info);5710 5711	trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);5712 5713	return send_set_info(xid, tcon, persistent_fid, volatile_fid,5714			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,5715			0, 1, &data, &size);5716}5717 5718int5719SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,5720		u64 persistent_fid, u64 volatile_fid,5721		struct smb_ntsd *pnntsd, int pacllen, int aclflag)5722{5723	return send_set_info(xid, tcon, persistent_fid, volatile_fid,5724			current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,5725			1, (void **)&pnntsd, &pacllen);5726}5727 5728int5729SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,5730	    u64 persistent_fid, u64 volatile_fid,5731	    struct smb2_file_full_ea_info *buf, int len)5732{5733	return send_set_info(xid, tcon, persistent_fid, volatile_fid,5734		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,5735		0, 1, (void **)&buf, &len);5736}5737 5738int5739SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,5740		  const u64 persistent_fid, const u64 volatile_fid,5741		  __u8 oplock_level)5742{5743	struct smb_rqst rqst;5744	int rc;5745	struct smb2_oplock_break *req = NULL;5746	struct cifs_ses *ses = tcon->ses;5747	struct TCP_Server_Info *server;5748	int flags = CIFS_OBREAK_OP;5749	unsigned int total_len;5750	struct kvec iov[1];5751	struct kvec rsp_iov;5752	int resp_buf_type;5753	int retries = 0, cur_sleep = 1;5754 5755replay_again:5756	/* reinitialize for possible replay */5757	flags = CIFS_OBREAK_OP;5758	server = cifs_pick_channel(ses);5759 5760	cifs_dbg(FYI, "SMB2_oplock_break\n");5761	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,5762				 (void **) &req, &total_len);5763	if (rc)5764		return rc;5765 5766	if (smb3_encryption_required(tcon))5767		flags |= CIFS_TRANSFORM_REQ;5768 5769	req->VolatileFid = volatile_fid;5770	req->PersistentFid = persistent_fid;5771	req->OplockLevel = oplock_level;5772	req->hdr.CreditRequest = cpu_to_le16(1);5773 5774	flags |= CIFS_NO_RSP_BUF;5775 5776	iov[0].iov_base = (char *)req;5777	iov[0].iov_len = total_len;5778 5779	memset(&rqst, 0, sizeof(struct smb_rqst));5780	rqst.rq_iov = iov;5781	rqst.rq_nvec = 1;5782 5783	if (retries)5784		smb2_set_replay(server, &rqst);5785 5786	rc = cifs_send_recv(xid, ses, server,5787			    &rqst, &resp_buf_type, flags, &rsp_iov);5788	cifs_small_buf_release(req);5789	if (rc) {5790		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);5791		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);5792	}5793 5794	if (is_replayable_error(rc) &&5795	    smb2_should_replay(tcon, &retries, &cur_sleep))5796		goto replay_again;5797 5798	return rc;5799}5800 5801void5802smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,5803			     struct kstatfs *kst)5804{5805	kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *5806			  le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);5807	kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);5808	kst->f_bfree  = kst->f_bavail =5809			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);5810	return;5811}5812 5813static void5814copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,5815			struct kstatfs *kst)5816{5817	kst->f_bsize = le32_to_cpu(response_data->BlockSize);5818	kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);5819	kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);5820	if (response_data->UserBlocksAvail == cpu_to_le64(-1))5821		kst->f_bavail = kst->f_bfree;5822	else5823		kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);5824	if (response_data->TotalFileNodes != cpu_to_le64(-1))5825		kst->f_files = le64_to_cpu(response_data->TotalFileNodes);5826	if (response_data->FreeFileNodes != cpu_to_le64(-1))5827		kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);5828 5829	return;5830}5831 5832static int5833build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,5834		   struct TCP_Server_Info *server,5835		   int level, int outbuf_len, u64 persistent_fid,5836		   u64 volatile_fid)5837{5838	int rc;5839	struct smb2_query_info_req *req;5840	unsigned int total_len;5841 5842	cifs_dbg(FYI, "Query FSInfo level %d\n", level);5843 5844	if ((tcon->ses == NULL) || server == NULL)5845		return -EIO;5846 5847	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,5848				 (void **) &req, &total_len);5849	if (rc)5850		return rc;5851 5852	req->InfoType = SMB2_O_INFO_FILESYSTEM;5853	req->FileInfoClass = level;5854	req->PersistentFileId = persistent_fid;5855	req->VolatileFileId = volatile_fid;5856	/* 1 for pad */5857	req->InputBufferOffset =5858			cpu_to_le16(sizeof(struct smb2_query_info_req));5859	req->OutputBufferLength = cpu_to_le32(5860		outbuf_len + sizeof(struct smb2_query_info_rsp));5861 5862	iov->iov_base = (char *)req;5863	iov->iov_len = total_len;5864	return 0;5865}5866 5867static inline void free_qfs_info_req(struct kvec *iov)5868{5869	cifs_buf_release(iov->iov_base);5870}5871 5872int5873SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,5874	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)5875{5876	struct smb_rqst rqst;5877	struct smb2_query_info_rsp *rsp = NULL;5878	struct kvec iov;5879	struct kvec rsp_iov;5880	int rc = 0;5881	int resp_buftype;5882	struct cifs_ses *ses = tcon->ses;5883	struct TCP_Server_Info *server;5884	FILE_SYSTEM_POSIX_INFO *info = NULL;5885	int flags = 0;5886	int retries = 0, cur_sleep = 1;5887 5888replay_again:5889	/* reinitialize for possible replay */5890	flags = 0;5891	server = cifs_pick_channel(ses);5892 5893	rc = build_qfs_info_req(&iov, tcon, server,5894				FS_POSIX_INFORMATION,5895				sizeof(FILE_SYSTEM_POSIX_INFO),5896				persistent_fid, volatile_fid);5897	if (rc)5898		return rc;5899 5900	if (smb3_encryption_required(tcon))5901		flags |= CIFS_TRANSFORM_REQ;5902 5903	memset(&rqst, 0, sizeof(struct smb_rqst));5904	rqst.rq_iov = &iov;5905	rqst.rq_nvec = 1;5906 5907	if (retries)5908		smb2_set_replay(server, &rqst);5909 5910	rc = cifs_send_recv(xid, ses, server,5911			    &rqst, &resp_buftype, flags, &rsp_iov);5912	free_qfs_info_req(&iov);5913	if (rc) {5914		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);5915		goto posix_qfsinf_exit;5916	}5917	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;5918 5919	info = (FILE_SYSTEM_POSIX_INFO *)(5920		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);5921	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),5922			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,5923			       sizeof(FILE_SYSTEM_POSIX_INFO));5924	if (!rc)5925		copy_posix_fs_info_to_kstatfs(info, fsdata);5926 5927posix_qfsinf_exit:5928	free_rsp_buf(resp_buftype, rsp_iov.iov_base);5929 5930	if (is_replayable_error(rc) &&5931	    smb2_should_replay(tcon, &retries, &cur_sleep))5932		goto replay_again;5933 5934	return rc;5935}5936 5937int5938SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,5939	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)5940{5941	struct smb_rqst rqst;5942	struct smb2_query_info_rsp *rsp = NULL;5943	struct kvec iov;5944	struct kvec rsp_iov;5945	int rc = 0;5946	int resp_buftype;5947	struct cifs_ses *ses = tcon->ses;5948	struct TCP_Server_Info *server;5949	struct smb2_fs_full_size_info *info = NULL;5950	int flags = 0;5951	int retries = 0, cur_sleep = 1;5952 5953replay_again:5954	/* reinitialize for possible replay */5955	flags = 0;5956	server = cifs_pick_channel(ses);5957 5958	rc = build_qfs_info_req(&iov, tcon, server,5959				FS_FULL_SIZE_INFORMATION,5960				sizeof(struct smb2_fs_full_size_info),5961				persistent_fid, volatile_fid);5962	if (rc)5963		return rc;5964 5965	if (smb3_encryption_required(tcon))5966		flags |= CIFS_TRANSFORM_REQ;5967 5968	memset(&rqst, 0, sizeof(struct smb_rqst));5969	rqst.rq_iov = &iov;5970	rqst.rq_nvec = 1;5971 5972	if (retries)5973		smb2_set_replay(server, &rqst);5974 5975	rc = cifs_send_recv(xid, ses, server,5976			    &rqst, &resp_buftype, flags, &rsp_iov);5977	free_qfs_info_req(&iov);5978	if (rc) {5979		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);5980		goto qfsinf_exit;5981	}5982	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;5983 5984	info = (struct smb2_fs_full_size_info *)(5985		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);5986	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),5987			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,5988			       sizeof(struct smb2_fs_full_size_info));5989	if (!rc)5990		smb2_copy_fs_info_to_kstatfs(info, fsdata);5991 5992qfsinf_exit:5993	free_rsp_buf(resp_buftype, rsp_iov.iov_base);5994 5995	if (is_replayable_error(rc) &&5996	    smb2_should_replay(tcon, &retries, &cur_sleep))5997		goto replay_again;5998 5999	return rc;6000}6001 6002int6003SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,6004	      u64 persistent_fid, u64 volatile_fid, int level)6005{6006	struct smb_rqst rqst;6007	struct smb2_query_info_rsp *rsp = NULL;6008	struct kvec iov;6009	struct kvec rsp_iov;6010	int rc = 0;6011	int resp_buftype, max_len, min_len;6012	struct cifs_ses *ses = tcon->ses;6013	struct TCP_Server_Info *server;6014	unsigned int rsp_len, offset;6015	int flags = 0;6016	int retries = 0, cur_sleep = 1;6017 6018replay_again:6019	/* reinitialize for possible replay */6020	flags = 0;6021	server = cifs_pick_channel(ses);6022 6023	if (level == FS_DEVICE_INFORMATION) {6024		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);6025		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);6026	} else if (level == FS_ATTRIBUTE_INFORMATION) {6027		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);6028		min_len = MIN_FS_ATTR_INFO_SIZE;6029	} else if (level == FS_SECTOR_SIZE_INFORMATION) {6030		max_len = sizeof(struct smb3_fs_ss_info);6031		min_len = sizeof(struct smb3_fs_ss_info);6032	} else if (level == FS_VOLUME_INFORMATION) {6033		max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;6034		min_len = sizeof(struct smb3_fs_vol_info);6035	} else {6036		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);6037		return -EINVAL;6038	}6039 6040	rc = build_qfs_info_req(&iov, tcon, server,6041				level, max_len,6042				persistent_fid, volatile_fid);6043	if (rc)6044		return rc;6045 6046	if (smb3_encryption_required(tcon))6047		flags |= CIFS_TRANSFORM_REQ;6048 6049	memset(&rqst, 0, sizeof(struct smb_rqst));6050	rqst.rq_iov = &iov;6051	rqst.rq_nvec = 1;6052 6053	if (retries)6054		smb2_set_replay(server, &rqst);6055 6056	rc = cifs_send_recv(xid, ses, server,6057			    &rqst, &resp_buftype, flags, &rsp_iov);6058	free_qfs_info_req(&iov);6059	if (rc) {6060		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);6061		goto qfsattr_exit;6062	}6063	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;6064 6065	rsp_len = le32_to_cpu(rsp->OutputBufferLength);6066	offset = le16_to_cpu(rsp->OutputBufferOffset);6067	rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);6068	if (rc)6069		goto qfsattr_exit;6070 6071	if (level == FS_ATTRIBUTE_INFORMATION)6072		memcpy(&tcon->fsAttrInfo, offset6073			+ (char *)rsp, min_t(unsigned int,6074			rsp_len, max_len));6075	else if (level == FS_DEVICE_INFORMATION)6076		memcpy(&tcon->fsDevInfo, offset6077			+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));6078	else if (level == FS_SECTOR_SIZE_INFORMATION) {6079		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)6080			(offset + (char *)rsp);6081		tcon->ss_flags = le32_to_cpu(ss_info->Flags);6082		tcon->perf_sector_size =6083			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);6084	} else if (level == FS_VOLUME_INFORMATION) {6085		struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)6086			(offset + (char *)rsp);6087		tcon->vol_serial_number = vol_info->VolumeSerialNumber;6088		tcon->vol_create_time = vol_info->VolumeCreationTime;6089	}6090 6091qfsattr_exit:6092	free_rsp_buf(resp_buftype, rsp_iov.iov_base);6093 6094	if (is_replayable_error(rc) &&6095	    smb2_should_replay(tcon, &retries, &cur_sleep))6096		goto replay_again;6097 6098	return rc;6099}6100 6101int6102smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,6103	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,6104	   const __u32 num_lock, struct smb2_lock_element *buf)6105{6106	struct smb_rqst rqst;6107	int rc = 0;6108	struct smb2_lock_req *req = NULL;6109	struct kvec iov[2];6110	struct kvec rsp_iov;6111	int resp_buf_type;6112	unsigned int count;6113	int flags = CIFS_NO_RSP_BUF;6114	unsigned int total_len;6115	struct TCP_Server_Info *server;6116	int retries = 0, cur_sleep = 1;6117 6118replay_again:6119	/* reinitialize for possible replay */6120	flags = CIFS_NO_RSP_BUF;6121	server = cifs_pick_channel(tcon->ses);6122 6123	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);6124 6125	rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,6126				 (void **) &req, &total_len);6127	if (rc)6128		return rc;6129 6130	if (smb3_encryption_required(tcon))6131		flags |= CIFS_TRANSFORM_REQ;6132 6133	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);6134	req->LockCount = cpu_to_le16(num_lock);6135 6136	req->PersistentFileId = persist_fid;6137	req->VolatileFileId = volatile_fid;6138 6139	count = num_lock * sizeof(struct smb2_lock_element);6140 6141	iov[0].iov_base = (char *)req;6142	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);6143	iov[1].iov_base = (char *)buf;6144	iov[1].iov_len = count;6145 6146	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);6147 6148	memset(&rqst, 0, sizeof(struct smb_rqst));6149	rqst.rq_iov = iov;6150	rqst.rq_nvec = 2;6151 6152	if (retries)6153		smb2_set_replay(server, &rqst);6154 6155	rc = cifs_send_recv(xid, tcon->ses, server,6156			    &rqst, &resp_buf_type, flags,6157			    &rsp_iov);6158	cifs_small_buf_release(req);6159	if (rc) {6160		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);6161		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);6162		trace_smb3_lock_err(xid, persist_fid, tcon->tid,6163				    tcon->ses->Suid, rc);6164	}6165 6166	if (is_replayable_error(rc) &&6167	    smb2_should_replay(tcon, &retries, &cur_sleep))6168		goto replay_again;6169 6170	return rc;6171}6172 6173int6174SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,6175	  const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,6176	  const __u64 length, const __u64 offset, const __u32 lock_flags,6177	  const bool wait)6178{6179	struct smb2_lock_element lock;6180 6181	lock.Offset = cpu_to_le64(offset);6182	lock.Length = cpu_to_le64(length);6183	lock.Flags = cpu_to_le32(lock_flags);6184	if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)6185		lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);6186 6187	return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);6188}6189 6190int6191SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,6192		 __u8 *lease_key, const __le32 lease_state)6193{6194	struct smb_rqst rqst;6195	int rc;6196	struct smb2_lease_ack *req = NULL;6197	struct cifs_ses *ses = tcon->ses;6198	int flags = CIFS_OBREAK_OP;6199	unsigned int total_len;6200	struct kvec iov[1];6201	struct kvec rsp_iov;6202	int resp_buf_type;6203	__u64 *please_key_high;6204	__u64 *please_key_low;6205	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);6206 6207	cifs_dbg(FYI, "SMB2_lease_break\n");6208	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,6209				 (void **) &req, &total_len);6210	if (rc)6211		return rc;6212 6213	if (smb3_encryption_required(tcon))6214		flags |= CIFS_TRANSFORM_REQ;6215 6216	req->hdr.CreditRequest = cpu_to_le16(1);6217	req->StructureSize = cpu_to_le16(36);6218	total_len += 12;6219 6220	memcpy(req->LeaseKey, lease_key, 16);6221	req->LeaseState = lease_state;6222 6223	flags |= CIFS_NO_RSP_BUF;6224 6225	iov[0].iov_base = (char *)req;6226	iov[0].iov_len = total_len;6227 6228	memset(&rqst, 0, sizeof(struct smb_rqst));6229	rqst.rq_iov = iov;6230	rqst.rq_nvec = 1;6231 6232	rc = cifs_send_recv(xid, ses, server,6233			    &rqst, &resp_buf_type, flags, &rsp_iov);6234	cifs_small_buf_release(req);6235 6236	please_key_low = (__u64 *)lease_key;6237	please_key_high = (__u64 *)(lease_key+8);6238	if (rc) {6239		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);6240		trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,6241			ses->Suid, *please_key_low, *please_key_high, rc);6242		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);6243	} else6244		trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,6245			ses->Suid, *please_key_low, *please_key_high);6246 6247	return rc;6248}6249