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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Generic HDLC support routines for Linux4 * Frame Relay support5 *6 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>7 *8 9 Theory of PVC state10 11 DCE mode:12 13 (exist,new) -> 0,0 when "PVC create" or if "link unreliable"14 0,x -> 1,1 if "link reliable" when sending FULL STATUS15 1,1 -> 1,0 if received FULL STATUS ACK16 17 (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"18 -> 1 when "PVC up" and (exist,new) = 1,019 20 DTE mode:21 (exist,new,active) = FULL STATUS if "link reliable"22 = 0, 0, 0 if "link unreliable"23 No LMI:24 active = open and "link reliable"25 exist = new = not used26 27 CCITT LMI: ITU-T Q.933 Annex A28 ANSI LMI: ANSI T1.617 Annex D29 CISCO LMI: the original, aka "Gang of Four" LMI30 31*/32 33#include <linux/errno.h>34#include <linux/etherdevice.h>35#include <linux/hdlc.h>36#include <linux/if_arp.h>37#include <linux/inetdevice.h>38#include <linux/init.h>39#include <linux/kernel.h>40#include <linux/module.h>41#include <linux/pkt_sched.h>42#include <linux/poll.h>43#include <linux/rtnetlink.h>44#include <linux/skbuff.h>45#include <linux/slab.h>46 47#undef DEBUG_PKT48#undef DEBUG_ECN49#undef DEBUG_LINK50#undef DEBUG_PROTO51#undef DEBUG_PVC52 53#define FR_UI 0x0354#define FR_PAD 0x0055 56#define NLPID_IP 0xCC57#define NLPID_IPV6 0x8E58#define NLPID_SNAP 0x8059#define NLPID_PAD 0x0060#define NLPID_CCITT_ANSI_LMI 0x0861#define NLPID_CISCO_LMI 0x0962 63#define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */64#define LMI_CISCO_DLCI 102365 66#define LMI_CALLREF 0x00 /* Call Reference */67#define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */68#define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */69#define LMI_CCITT_REPTYPE 0x5170#define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */71#define LMI_CCITT_ALIVE 0x5372#define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */73#define LMI_CCITT_PVCSTAT 0x5774 75#define LMI_FULLREP 0x00 /* full report */76#define LMI_INTEGRITY 0x01 /* link integrity report */77#define LMI_SINGLE 0x02 /* single PVC report */78 79#define LMI_STATUS_ENQUIRY 0x7580#define LMI_STATUS 0x7D /* reply */81 82#define LMI_REPT_LEN 1 /* report type element length */83#define LMI_INTEG_LEN 2 /* link integrity element length */84 85#define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */86#define LMI_ANSI_LENGTH 1487 88struct fr_hdr {89#if defined(__LITTLE_ENDIAN_BITFIELD)90 unsigned ea1: 1;91 unsigned cr: 1;92 unsigned dlcih: 6;93 94 unsigned ea2: 1;95 unsigned de: 1;96 unsigned becn: 1;97 unsigned fecn: 1;98 unsigned dlcil: 4;99#else100 unsigned dlcih: 6;101 unsigned cr: 1;102 unsigned ea1: 1;103 104 unsigned dlcil: 4;105 unsigned fecn: 1;106 unsigned becn: 1;107 unsigned de: 1;108 unsigned ea2: 1;109#endif110} __packed;111 112struct pvc_device {113 struct net_device *frad;114 struct net_device *main;115 struct net_device *ether; /* bridged Ethernet interface */116 struct pvc_device *next; /* Sorted in ascending DLCI order */117 int dlci;118 int open_count;119 120 struct {121 unsigned int new: 1;122 unsigned int active: 1;123 unsigned int exist: 1;124 unsigned int deleted: 1;125 unsigned int fecn: 1;126 unsigned int becn: 1;127 unsigned int bandwidth; /* Cisco LMI reporting only */128 } state;129};130 131struct frad_state {132 fr_proto settings;133 struct pvc_device *first_pvc;134 int dce_pvc_count;135 136 struct timer_list timer;137 struct net_device *dev;138 unsigned long last_poll;139 int reliable;140 int dce_changed;141 int request;142 int fullrep_sent;143 u32 last_errors; /* last errors bit list */144 u8 n391cnt;145 u8 txseq; /* TX sequence number */146 u8 rxseq; /* RX sequence number */147};148 149static int fr_ioctl(struct net_device *dev, struct if_settings *ifs);150 151static inline u16 q922_to_dlci(u8 *hdr)152{153 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);154}155 156static inline void dlci_to_q922(u8 *hdr, u16 dlci)157{158 hdr[0] = (dlci >> 2) & 0xFC;159 hdr[1] = ((dlci << 4) & 0xF0) | 0x01;160}161 162static inline struct frad_state *state(hdlc_device *hdlc)163{164 return (struct frad_state *)(hdlc->state);165}166 167static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)168{169 struct pvc_device *pvc = state(hdlc)->first_pvc;170 171 while (pvc) {172 if (pvc->dlci == dlci)173 return pvc;174 if (pvc->dlci > dlci)175 return NULL; /* the list is sorted */176 pvc = pvc->next;177 }178 179 return NULL;180}181 182static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)183{184 hdlc_device *hdlc = dev_to_hdlc(dev);185 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;186 187 while (*pvc_p) {188 if ((*pvc_p)->dlci == dlci)189 return *pvc_p;190 if ((*pvc_p)->dlci > dlci)191 break; /* the list is sorted */192 pvc_p = &(*pvc_p)->next;193 }194 195 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);196#ifdef DEBUG_PVC197 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);198#endif199 if (!pvc)200 return NULL;201 202 pvc->dlci = dlci;203 pvc->frad = dev;204 pvc->next = *pvc_p; /* Put it in the chain */205 *pvc_p = pvc;206 return pvc;207}208 209static inline int pvc_is_used(struct pvc_device *pvc)210{211 return pvc->main || pvc->ether;212}213 214static inline void pvc_carrier(int on, struct pvc_device *pvc)215{216 if (on) {217 if (pvc->main)218 if (!netif_carrier_ok(pvc->main))219 netif_carrier_on(pvc->main);220 if (pvc->ether)221 if (!netif_carrier_ok(pvc->ether))222 netif_carrier_on(pvc->ether);223 } else {224 if (pvc->main)225 if (netif_carrier_ok(pvc->main))226 netif_carrier_off(pvc->main);227 if (pvc->ether)228 if (netif_carrier_ok(pvc->ether))229 netif_carrier_off(pvc->ether);230 }231}232 233static inline void delete_unused_pvcs(hdlc_device *hdlc)234{235 struct pvc_device **pvc_p = &state(hdlc)->first_pvc;236 237 while (*pvc_p) {238 if (!pvc_is_used(*pvc_p)) {239 struct pvc_device *pvc = *pvc_p;240#ifdef DEBUG_PVC241 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);242#endif243 *pvc_p = pvc->next;244 kfree(pvc);245 continue;246 }247 pvc_p = &(*pvc_p)->next;248 }249}250 251static inline struct net_device **get_dev_p(struct pvc_device *pvc,252 int type)253{254 if (type == ARPHRD_ETHER)255 return &pvc->ether;256 else257 return &pvc->main;258}259 260static int fr_hard_header(struct sk_buff *skb, u16 dlci)261{262 if (!skb->dev) { /* Control packets */263 switch (dlci) {264 case LMI_CCITT_ANSI_DLCI:265 skb_push(skb, 4);266 skb->data[3] = NLPID_CCITT_ANSI_LMI;267 break;268 269 case LMI_CISCO_DLCI:270 skb_push(skb, 4);271 skb->data[3] = NLPID_CISCO_LMI;272 break;273 274 default:275 return -EINVAL;276 }277 278 } else if (skb->dev->type == ARPHRD_DLCI) {279 switch (skb->protocol) {280 case htons(ETH_P_IP):281 skb_push(skb, 4);282 skb->data[3] = NLPID_IP;283 break;284 285 case htons(ETH_P_IPV6):286 skb_push(skb, 4);287 skb->data[3] = NLPID_IPV6;288 break;289 290 default:291 skb_push(skb, 10);292 skb->data[3] = FR_PAD;293 skb->data[4] = NLPID_SNAP;294 /* OUI 00-00-00 indicates an Ethertype follows */295 skb->data[5] = 0x00;296 skb->data[6] = 0x00;297 skb->data[7] = 0x00;298 /* This should be an Ethertype: */299 *(__be16 *)(skb->data + 8) = skb->protocol;300 }301 302 } else if (skb->dev->type == ARPHRD_ETHER) {303 skb_push(skb, 10);304 skb->data[3] = FR_PAD;305 skb->data[4] = NLPID_SNAP;306 /* OUI 00-80-C2 stands for the 802.1 organization */307 skb->data[5] = 0x00;308 skb->data[6] = 0x80;309 skb->data[7] = 0xC2;310 /* PID 00-07 stands for Ethernet frames without FCS */311 skb->data[8] = 0x00;312 skb->data[9] = 0x07;313 314 } else {315 return -EINVAL;316 }317 318 dlci_to_q922(skb->data, dlci);319 skb->data[2] = FR_UI;320 return 0;321}322 323static int pvc_open(struct net_device *dev)324{325 struct pvc_device *pvc = dev->ml_priv;326 327 if ((pvc->frad->flags & IFF_UP) == 0)328 return -EIO; /* Frad must be UP in order to activate PVC */329 330 if (pvc->open_count++ == 0) {331 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);332 333 if (state(hdlc)->settings.lmi == LMI_NONE)334 pvc->state.active = netif_carrier_ok(pvc->frad);335 336 pvc_carrier(pvc->state.active, pvc);337 state(hdlc)->dce_changed = 1;338 }339 return 0;340}341 342static int pvc_close(struct net_device *dev)343{344 struct pvc_device *pvc = dev->ml_priv;345 346 if (--pvc->open_count == 0) {347 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);348 349 if (state(hdlc)->settings.lmi == LMI_NONE)350 pvc->state.active = 0;351 352 if (state(hdlc)->settings.dce) {353 state(hdlc)->dce_changed = 1;354 pvc->state.active = 0;355 }356 }357 return 0;358}359 360static int pvc_ioctl(struct net_device *dev, struct if_settings *ifs)361{362 struct pvc_device *pvc = dev->ml_priv;363 fr_proto_pvc_info info;364 365 if (ifs->type == IF_GET_PROTO) {366 if (dev->type == ARPHRD_ETHER)367 ifs->type = IF_PROTO_FR_ETH_PVC;368 else369 ifs->type = IF_PROTO_FR_PVC;370 371 if (ifs->size < sizeof(info)) {372 /* data size wanted */373 ifs->size = sizeof(info);374 return -ENOBUFS;375 }376 377 info.dlci = pvc->dlci;378 memcpy(info.master, pvc->frad->name, IFNAMSIZ);379 if (copy_to_user(ifs->ifs_ifsu.fr_pvc_info,380 &info, sizeof(info)))381 return -EFAULT;382 return 0;383 }384 385 return -EINVAL;386}387 388static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)389{390 struct pvc_device *pvc = dev->ml_priv;391 392 if (!pvc->state.active)393 goto drop;394 395 if (dev->type == ARPHRD_ETHER) {396 int pad = ETH_ZLEN - skb->len;397 398 if (pad > 0) { /* Pad the frame with zeros */399 if (__skb_pad(skb, pad, false))400 goto drop;401 skb_put(skb, pad);402 }403 }404 405 /* We already requested the header space with dev->needed_headroom.406 * So this is just a protection in case the upper layer didn't take407 * dev->needed_headroom into consideration.408 */409 if (skb_headroom(skb) < 10) {410 struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);411 412 if (!skb2)413 goto drop;414 dev_kfree_skb(skb);415 skb = skb2;416 }417 418 skb->dev = dev;419 if (fr_hard_header(skb, pvc->dlci))420 goto drop;421 422 dev->stats.tx_bytes += skb->len;423 dev->stats.tx_packets++;424 if (pvc->state.fecn) /* TX Congestion counter */425 dev->stats.tx_compressed++;426 skb->dev = pvc->frad;427 skb->protocol = htons(ETH_P_HDLC);428 skb_reset_network_header(skb);429 dev_queue_xmit(skb);430 return NETDEV_TX_OK;431 432drop:433 dev->stats.tx_dropped++;434 kfree_skb(skb);435 return NETDEV_TX_OK;436}437 438static inline void fr_log_dlci_active(struct pvc_device *pvc)439{440 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",441 pvc->dlci,442 pvc->main ? pvc->main->name : "",443 pvc->main && pvc->ether ? " " : "",444 pvc->ether ? pvc->ether->name : "",445 pvc->state.new ? " new" : "",446 !pvc->state.exist ? "deleted" :447 pvc->state.active ? "active" : "inactive");448}449 450static inline u8 fr_lmi_nextseq(u8 x)451{452 x++;453 return x ? x : 1;454}455 456static void fr_lmi_send(struct net_device *dev, int fullrep)457{458 hdlc_device *hdlc = dev_to_hdlc(dev);459 struct sk_buff *skb;460 struct pvc_device *pvc = state(hdlc)->first_pvc;461 int lmi = state(hdlc)->settings.lmi;462 int dce = state(hdlc)->settings.dce;463 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;464 int stat_len = (lmi == LMI_CISCO) ? 6 : 3;465 u8 *data;466 int i = 0;467 468 if (dce && fullrep) {469 len += state(hdlc)->dce_pvc_count * (2 + stat_len);470 if (len > HDLC_MAX_MRU) {471 netdev_warn(dev, "Too many PVCs while sending LMI full report\n");472 return;473 }474 }475 476 skb = dev_alloc_skb(len);477 if (!skb)478 return;479 480 memset(skb->data, 0, len);481 skb_reserve(skb, 4);482 if (lmi == LMI_CISCO)483 fr_hard_header(skb, LMI_CISCO_DLCI);484 else485 fr_hard_header(skb, LMI_CCITT_ANSI_DLCI);486 487 data = skb_tail_pointer(skb);488 data[i++] = LMI_CALLREF;489 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;490 if (lmi == LMI_ANSI)491 data[i++] = LMI_ANSI_LOCKSHIFT;492 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :493 LMI_ANSI_CISCO_REPTYPE;494 data[i++] = LMI_REPT_LEN;495 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;496 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;497 data[i++] = LMI_INTEG_LEN;498 data[i++] = state(hdlc)->txseq =499 fr_lmi_nextseq(state(hdlc)->txseq);500 data[i++] = state(hdlc)->rxseq;501 502 if (dce && fullrep) {503 while (pvc) {504 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :505 LMI_ANSI_CISCO_PVCSTAT;506 data[i++] = stat_len;507 508 /* LMI start/restart */509 if (state(hdlc)->reliable && !pvc->state.exist) {510 pvc->state.exist = pvc->state.new = 1;511 fr_log_dlci_active(pvc);512 }513 514 /* ifconfig PVC up */515 if (pvc->open_count && !pvc->state.active &&516 pvc->state.exist && !pvc->state.new) {517 pvc_carrier(1, pvc);518 pvc->state.active = 1;519 fr_log_dlci_active(pvc);520 }521 522 if (lmi == LMI_CISCO) {523 data[i] = pvc->dlci >> 8;524 data[i + 1] = pvc->dlci & 0xFF;525 } else {526 data[i] = (pvc->dlci >> 4) & 0x3F;527 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;528 data[i + 2] = 0x80;529 }530 531 if (pvc->state.new)532 data[i + 2] |= 0x08;533 else if (pvc->state.active)534 data[i + 2] |= 0x02;535 536 i += stat_len;537 pvc = pvc->next;538 }539 }540 541 skb_put(skb, i);542 skb->priority = TC_PRIO_CONTROL;543 skb->dev = dev;544 skb->protocol = htons(ETH_P_HDLC);545 skb_reset_network_header(skb);546 547 dev_queue_xmit(skb);548}549 550static void fr_set_link_state(int reliable, struct net_device *dev)551{552 hdlc_device *hdlc = dev_to_hdlc(dev);553 struct pvc_device *pvc = state(hdlc)->first_pvc;554 555 state(hdlc)->reliable = reliable;556 if (reliable) {557 netif_dormant_off(dev);558 state(hdlc)->n391cnt = 0; /* Request full status */559 state(hdlc)->dce_changed = 1;560 561 if (state(hdlc)->settings.lmi == LMI_NONE) {562 while (pvc) { /* Activate all PVCs */563 pvc_carrier(1, pvc);564 pvc->state.exist = pvc->state.active = 1;565 pvc->state.new = 0;566 pvc = pvc->next;567 }568 }569 } else {570 netif_dormant_on(dev);571 while (pvc) { /* Deactivate all PVCs */572 pvc_carrier(0, pvc);573 pvc->state.exist = pvc->state.active = 0;574 pvc->state.new = 0;575 if (!state(hdlc)->settings.dce)576 pvc->state.bandwidth = 0;577 pvc = pvc->next;578 }579 }580}581 582static void fr_timer(struct timer_list *t)583{584 struct frad_state *st = from_timer(st, t, timer);585 struct net_device *dev = st->dev;586 hdlc_device *hdlc = dev_to_hdlc(dev);587 int i, cnt = 0, reliable;588 u32 list;589 590 if (state(hdlc)->settings.dce) {591 reliable = state(hdlc)->request &&592 time_before(jiffies, state(hdlc)->last_poll +593 state(hdlc)->settings.t392 * HZ);594 state(hdlc)->request = 0;595 } else {596 state(hdlc)->last_errors <<= 1; /* Shift the list */597 if (state(hdlc)->request) {598 if (state(hdlc)->reliable)599 netdev_info(dev, "No LMI status reply received\n");600 state(hdlc)->last_errors |= 1;601 }602 603 list = state(hdlc)->last_errors;604 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)605 cnt += (list & 1); /* errors count */606 607 reliable = (cnt < state(hdlc)->settings.n392);608 }609 610 if (state(hdlc)->reliable != reliable) {611 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");612 fr_set_link_state(reliable, dev);613 }614 615 if (state(hdlc)->settings.dce) {616 state(hdlc)->timer.expires = jiffies +617 state(hdlc)->settings.t392 * HZ;618 } else {619 if (state(hdlc)->n391cnt)620 state(hdlc)->n391cnt--;621 622 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);623 624 state(hdlc)->last_poll = jiffies;625 state(hdlc)->request = 1;626 state(hdlc)->timer.expires = jiffies +627 state(hdlc)->settings.t391 * HZ;628 }629 630 add_timer(&state(hdlc)->timer);631}632 633static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)634{635 hdlc_device *hdlc = dev_to_hdlc(dev);636 struct pvc_device *pvc;637 u8 rxseq, txseq;638 int lmi = state(hdlc)->settings.lmi;639 int dce = state(hdlc)->settings.dce;640 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;641 642 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :643 LMI_CCITT_CISCO_LENGTH)) {644 netdev_info(dev, "Short LMI frame\n");645 return 1;646 }647 648 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :649 NLPID_CCITT_ANSI_LMI)) {650 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");651 return 1;652 }653 654 if (skb->data[4] != LMI_CALLREF) {655 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",656 skb->data[4]);657 return 1;658 }659 660 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {661 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",662 skb->data[5]);663 return 1;664 }665 666 if (lmi == LMI_ANSI) {667 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {668 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",669 skb->data[6]);670 return 1;671 }672 i = 7;673 } else {674 i = 6;675 }676 677 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :678 LMI_ANSI_CISCO_REPTYPE)) {679 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",680 skb->data[i]);681 return 1;682 }683 684 if (skb->data[++i] != LMI_REPT_LEN) {685 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",686 skb->data[i]);687 return 1;688 }689 690 reptype = skb->data[++i];691 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {692 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",693 reptype);694 return 1;695 }696 697 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :698 LMI_ANSI_CISCO_ALIVE)) {699 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",700 skb->data[i]);701 return 1;702 }703 704 if (skb->data[++i] != LMI_INTEG_LEN) {705 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",706 skb->data[i]);707 return 1;708 }709 i++;710 711 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */712 rxseq = skb->data[i++]; /* Should confirm our sequence */713 714 txseq = state(hdlc)->txseq;715 716 if (dce)717 state(hdlc)->last_poll = jiffies;718 719 error = 0;720 if (!state(hdlc)->reliable)721 error = 1;722 723 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */724 state(hdlc)->n391cnt = 0;725 error = 1;726 }727 728 if (dce) {729 if (state(hdlc)->fullrep_sent && !error) {730/* Stop sending full report - the last one has been confirmed by DTE */731 state(hdlc)->fullrep_sent = 0;732 pvc = state(hdlc)->first_pvc;733 while (pvc) {734 if (pvc->state.new) {735 pvc->state.new = 0;736 737/* Tell DTE that new PVC is now active */738 state(hdlc)->dce_changed = 1;739 }740 pvc = pvc->next;741 }742 }743 744 if (state(hdlc)->dce_changed) {745 reptype = LMI_FULLREP;746 state(hdlc)->fullrep_sent = 1;747 state(hdlc)->dce_changed = 0;748 }749 750 state(hdlc)->request = 1; /* got request */751 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);752 return 0;753 }754 755 /* DTE */756 757 state(hdlc)->request = 0; /* got response, no request pending */758 759 if (error)760 return 0;761 762 if (reptype != LMI_FULLREP)763 return 0;764 765 pvc = state(hdlc)->first_pvc;766 767 while (pvc) {768 pvc->state.deleted = 1;769 pvc = pvc->next;770 }771 772 no_ram = 0;773 while (skb->len >= i + 2 + stat_len) {774 u16 dlci;775 u32 bw;776 unsigned int active, new;777 778 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :779 LMI_ANSI_CISCO_PVCSTAT)) {780 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",781 skb->data[i]);782 return 1;783 }784 785 if (skb->data[++i] != stat_len) {786 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",787 skb->data[i]);788 return 1;789 }790 i++;791 792 new = !!(skb->data[i + 2] & 0x08);793 active = !!(skb->data[i + 2] & 0x02);794 if (lmi == LMI_CISCO) {795 dlci = (skb->data[i] << 8) | skb->data[i + 1];796 bw = (skb->data[i + 3] << 16) |797 (skb->data[i + 4] << 8) |798 (skb->data[i + 5]);799 } else {800 dlci = ((skb->data[i] & 0x3F) << 4) |801 ((skb->data[i + 1] & 0x78) >> 3);802 bw = 0;803 }804 805 pvc = add_pvc(dev, dlci);806 807 if (!pvc && !no_ram) {808 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");809 no_ram = 1;810 }811 812 if (pvc) {813 pvc->state.exist = 1;814 pvc->state.deleted = 0;815 if (active != pvc->state.active ||816 new != pvc->state.new ||817 bw != pvc->state.bandwidth ||818 !pvc->state.exist) {819 pvc->state.new = new;820 pvc->state.active = active;821 pvc->state.bandwidth = bw;822 pvc_carrier(active, pvc);823 fr_log_dlci_active(pvc);824 }825 }826 827 i += stat_len;828 }829 830 pvc = state(hdlc)->first_pvc;831 832 while (pvc) {833 if (pvc->state.deleted && pvc->state.exist) {834 pvc_carrier(0, pvc);835 pvc->state.active = pvc->state.new = 0;836 pvc->state.exist = 0;837 pvc->state.bandwidth = 0;838 fr_log_dlci_active(pvc);839 }840 pvc = pvc->next;841 }842 843 /* Next full report after N391 polls */844 state(hdlc)->n391cnt = state(hdlc)->settings.n391;845 846 return 0;847}848 849static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc)850{851 /* OUI 00-00-00 indicates an Ethertype follows */852 if (skb->data[0] == 0x00 &&853 skb->data[1] == 0x00 &&854 skb->data[2] == 0x00) {855 if (!pvc->main)856 return -1;857 skb->dev = pvc->main;858 skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */859 skb_pull(skb, 5);860 skb_reset_mac_header(skb);861 return 0;862 863 /* OUI 00-80-C2 stands for the 802.1 organization */864 } else if (skb->data[0] == 0x00 &&865 skb->data[1] == 0x80 &&866 skb->data[2] == 0xC2) {867 /* PID 00-07 stands for Ethernet frames without FCS */868 if (skb->data[3] == 0x00 &&869 skb->data[4] == 0x07) {870 if (!pvc->ether)871 return -1;872 skb_pull(skb, 5);873 if (skb->len < ETH_HLEN)874 return -1;875 skb->protocol = eth_type_trans(skb, pvc->ether);876 return 0;877 878 /* PID unsupported */879 } else {880 return -1;881 }882 883 /* OUI unsupported */884 } else {885 return -1;886 }887}888 889static int fr_rx(struct sk_buff *skb)890{891 struct net_device *frad = skb->dev;892 hdlc_device *hdlc = dev_to_hdlc(frad);893 struct fr_hdr *fh = (struct fr_hdr *)skb->data;894 u8 *data = skb->data;895 u16 dlci;896 struct pvc_device *pvc;897 struct net_device *dev;898 899 if (skb->len < 4 || fh->ea1 || !fh->ea2 || data[2] != FR_UI)900 goto rx_error;901 902 dlci = q922_to_dlci(skb->data);903 904 if ((dlci == LMI_CCITT_ANSI_DLCI &&905 (state(hdlc)->settings.lmi == LMI_ANSI ||906 state(hdlc)->settings.lmi == LMI_CCITT)) ||907 (dlci == LMI_CISCO_DLCI &&908 state(hdlc)->settings.lmi == LMI_CISCO)) {909 if (fr_lmi_recv(frad, skb))910 goto rx_error;911 dev_kfree_skb_any(skb);912 return NET_RX_SUCCESS;913 }914 915 pvc = find_pvc(hdlc, dlci);916 if (!pvc) {917#ifdef DEBUG_PKT918 netdev_info(frad, "No PVC for received frame's DLCI %d\n",919 dlci);920#endif921 goto rx_drop;922 }923 924 if (pvc->state.fecn != fh->fecn) {925#ifdef DEBUG_ECN926 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,927 dlci, fh->fecn ? "N" : "FF");928#endif929 pvc->state.fecn ^= 1;930 }931 932 if (pvc->state.becn != fh->becn) {933#ifdef DEBUG_ECN934 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,935 dlci, fh->becn ? "N" : "FF");936#endif937 pvc->state.becn ^= 1;938 }939 940 skb = skb_share_check(skb, GFP_ATOMIC);941 if (!skb) {942 frad->stats.rx_dropped++;943 return NET_RX_DROP;944 }945 946 if (data[3] == NLPID_IP) {947 if (!pvc->main)948 goto rx_drop;949 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */950 skb->dev = pvc->main;951 skb->protocol = htons(ETH_P_IP);952 skb_reset_mac_header(skb);953 954 } else if (data[3] == NLPID_IPV6) {955 if (!pvc->main)956 goto rx_drop;957 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */958 skb->dev = pvc->main;959 skb->protocol = htons(ETH_P_IPV6);960 skb_reset_mac_header(skb);961 962 } else if (data[3] == FR_PAD) {963 if (skb->len < 5)964 goto rx_error;965 if (data[4] == NLPID_SNAP) { /* A SNAP header follows */966 skb_pull(skb, 5);967 if (skb->len < 5) /* Incomplete SNAP header */968 goto rx_error;969 if (fr_snap_parse(skb, pvc))970 goto rx_drop;971 } else {972 goto rx_drop;973 }974 975 } else {976 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",977 data[3], skb->len);978 goto rx_drop;979 }980 981 dev = skb->dev;982 dev->stats.rx_packets++; /* PVC traffic */983 dev->stats.rx_bytes += skb->len;984 if (pvc->state.becn)985 dev->stats.rx_compressed++;986 netif_rx(skb);987 return NET_RX_SUCCESS;988 989rx_error:990 frad->stats.rx_errors++; /* Mark error */991rx_drop:992 dev_kfree_skb_any(skb);993 return NET_RX_DROP;994}995 996static void fr_start(struct net_device *dev)997{998 hdlc_device *hdlc = dev_to_hdlc(dev);999#ifdef DEBUG_LINK1000 printk(KERN_DEBUG "fr_start\n");1001#endif1002 if (state(hdlc)->settings.lmi != LMI_NONE) {1003 state(hdlc)->reliable = 0;1004 state(hdlc)->dce_changed = 1;1005 state(hdlc)->request = 0;1006 state(hdlc)->fullrep_sent = 0;1007 state(hdlc)->last_errors = 0xFFFFFFFF;1008 state(hdlc)->n391cnt = 0;1009 state(hdlc)->txseq = state(hdlc)->rxseq = 0;1010 1011 state(hdlc)->dev = dev;1012 timer_setup(&state(hdlc)->timer, fr_timer, 0);1013 /* First poll after 1 s */1014 state(hdlc)->timer.expires = jiffies + HZ;1015 add_timer(&state(hdlc)->timer);1016 } else {1017 fr_set_link_state(1, dev);1018 }1019}1020 1021static void fr_stop(struct net_device *dev)1022{1023 hdlc_device *hdlc = dev_to_hdlc(dev);1024#ifdef DEBUG_LINK1025 printk(KERN_DEBUG "fr_stop\n");1026#endif1027 if (state(hdlc)->settings.lmi != LMI_NONE)1028 del_timer_sync(&state(hdlc)->timer);1029 fr_set_link_state(0, dev);1030}1031 1032static void fr_close(struct net_device *dev)1033{1034 hdlc_device *hdlc = dev_to_hdlc(dev);1035 struct pvc_device *pvc = state(hdlc)->first_pvc;1036 1037 while (pvc) { /* Shutdown all PVCs for this FRAD */1038 if (pvc->main)1039 dev_close(pvc->main);1040 if (pvc->ether)1041 dev_close(pvc->ether);1042 pvc = pvc->next;1043 }1044}1045 1046static void pvc_setup(struct net_device *dev)1047{1048 dev->type = ARPHRD_DLCI;1049 dev->flags = IFF_POINTOPOINT;1050 dev->hard_header_len = 0;1051 dev->addr_len = 2;1052 netif_keep_dst(dev);1053}1054 1055static const struct net_device_ops pvc_ops = {1056 .ndo_open = pvc_open,1057 .ndo_stop = pvc_close,1058 .ndo_start_xmit = pvc_xmit,1059 .ndo_siocwandev = pvc_ioctl,1060};1061 1062static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)1063{1064 hdlc_device *hdlc = dev_to_hdlc(frad);1065 struct pvc_device *pvc;1066 struct net_device *dev;1067 int used;1068 1069 pvc = add_pvc(frad, dlci);1070 if (!pvc) {1071 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");1072 return -ENOBUFS;1073 }1074 1075 if (*get_dev_p(pvc, type))1076 return -EEXIST;1077 1078 used = pvc_is_used(pvc);1079 1080 if (type == ARPHRD_ETHER)1081 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,1082 ether_setup);1083 else1084 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);1085 1086 if (!dev) {1087 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");1088 delete_unused_pvcs(hdlc);1089 return -ENOBUFS;1090 }1091 1092 if (type == ARPHRD_ETHER) {1093 dev->priv_flags &= ~IFF_TX_SKB_SHARING;1094 eth_hw_addr_random(dev);1095 } else {1096 __be16 addr = htons(dlci);1097 1098 dev_addr_set(dev, (u8 *)&addr);1099 dlci_to_q922(dev->broadcast, dlci);1100 }1101 dev->netdev_ops = &pvc_ops;1102 dev->mtu = HDLC_MAX_MTU;1103 dev->min_mtu = 68;1104 dev->max_mtu = HDLC_MAX_MTU;1105 dev->needed_headroom = 10;1106 dev->priv_flags |= IFF_NO_QUEUE;1107 dev->ml_priv = pvc;1108 1109 if (register_netdevice(dev) != 0) {1110 free_netdev(dev);1111 delete_unused_pvcs(hdlc);1112 return -EIO;1113 }1114 1115 dev->needs_free_netdev = true;1116 *get_dev_p(pvc, type) = dev;1117 if (!used) {1118 state(hdlc)->dce_changed = 1;1119 state(hdlc)->dce_pvc_count++;1120 }1121 return 0;1122}1123 1124static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)1125{1126 struct pvc_device *pvc;1127 struct net_device *dev;1128 1129 pvc = find_pvc(hdlc, dlci);1130 if (!pvc)1131 return -ENOENT;1132 1133 dev = *get_dev_p(pvc, type);1134 if (!dev)1135 return -ENOENT;1136 1137 if (dev->flags & IFF_UP)1138 return -EBUSY; /* PVC in use */1139 1140 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */1141 *get_dev_p(pvc, type) = NULL;1142 1143 if (!pvc_is_used(pvc)) {1144 state(hdlc)->dce_pvc_count--;1145 state(hdlc)->dce_changed = 1;1146 }1147 delete_unused_pvcs(hdlc);1148 return 0;1149}1150 1151static void fr_destroy(struct net_device *frad)1152{1153 hdlc_device *hdlc = dev_to_hdlc(frad);1154 struct pvc_device *pvc = state(hdlc)->first_pvc;1155 1156 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */1157 state(hdlc)->dce_pvc_count = 0;1158 state(hdlc)->dce_changed = 1;1159 1160 while (pvc) {1161 struct pvc_device *next = pvc->next;1162 /* destructors will free_netdev() main and ether */1163 if (pvc->main)1164 unregister_netdevice(pvc->main);1165 1166 if (pvc->ether)1167 unregister_netdevice(pvc->ether);1168 1169 kfree(pvc);1170 pvc = next;1171 }1172}1173 1174static struct hdlc_proto proto = {1175 .close = fr_close,1176 .start = fr_start,1177 .stop = fr_stop,1178 .detach = fr_destroy,1179 .ioctl = fr_ioctl,1180 .netif_rx = fr_rx,1181 .module = THIS_MODULE,1182};1183 1184static int fr_ioctl(struct net_device *dev, struct if_settings *ifs)1185{1186 fr_proto __user *fr_s = ifs->ifs_ifsu.fr;1187 const size_t size = sizeof(fr_proto);1188 fr_proto new_settings;1189 hdlc_device *hdlc = dev_to_hdlc(dev);1190 fr_proto_pvc pvc;1191 int result;1192 1193 switch (ifs->type) {1194 case IF_GET_PROTO:1195 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */1196 return -EINVAL;1197 ifs->type = IF_PROTO_FR;1198 if (ifs->size < size) {1199 ifs->size = size; /* data size wanted */1200 return -ENOBUFS;1201 }1202 if (copy_to_user(fr_s, &state(hdlc)->settings, size))1203 return -EFAULT;1204 return 0;1205 1206 case IF_PROTO_FR:1207 if (!capable(CAP_NET_ADMIN))1208 return -EPERM;1209 1210 if (dev->flags & IFF_UP)1211 return -EBUSY;1212 1213 if (copy_from_user(&new_settings, fr_s, size))1214 return -EFAULT;1215 1216 if (new_settings.lmi == LMI_DEFAULT)1217 new_settings.lmi = LMI_ANSI;1218 1219 if ((new_settings.lmi != LMI_NONE &&1220 new_settings.lmi != LMI_ANSI &&1221 new_settings.lmi != LMI_CCITT &&1222 new_settings.lmi != LMI_CISCO) ||1223 new_settings.t391 < 1 ||1224 new_settings.t392 < 2 ||1225 new_settings.n391 < 1 ||1226 new_settings.n392 < 1 ||1227 new_settings.n393 < new_settings.n392 ||1228 new_settings.n393 > 32 ||1229 (new_settings.dce != 0 &&1230 new_settings.dce != 1))1231 return -EINVAL;1232 1233 result = hdlc->attach(dev, ENCODING_NRZ,1234 PARITY_CRC16_PR1_CCITT);1235 if (result)1236 return result;1237 1238 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */1239 result = attach_hdlc_protocol(dev, &proto,1240 sizeof(struct frad_state));1241 if (result)1242 return result;1243 state(hdlc)->first_pvc = NULL;1244 state(hdlc)->dce_pvc_count = 0;1245 }1246 memcpy(&state(hdlc)->settings, &new_settings, size);1247 dev->type = ARPHRD_FRAD;1248 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);1249 return 0;1250 1251 case IF_PROTO_FR_ADD_PVC:1252 case IF_PROTO_FR_DEL_PVC:1253 case IF_PROTO_FR_ADD_ETH_PVC:1254 case IF_PROTO_FR_DEL_ETH_PVC:1255 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */1256 return -EINVAL;1257 1258 if (!capable(CAP_NET_ADMIN))1259 return -EPERM;1260 1261 if (copy_from_user(&pvc, ifs->ifs_ifsu.fr_pvc,1262 sizeof(fr_proto_pvc)))1263 return -EFAULT;1264 1265 if (pvc.dlci <= 0 || pvc.dlci >= 1024)1266 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */1267 1268 if (ifs->type == IF_PROTO_FR_ADD_ETH_PVC ||1269 ifs->type == IF_PROTO_FR_DEL_ETH_PVC)1270 result = ARPHRD_ETHER; /* bridged Ethernet device */1271 else1272 result = ARPHRD_DLCI;1273 1274 if (ifs->type == IF_PROTO_FR_ADD_PVC ||1275 ifs->type == IF_PROTO_FR_ADD_ETH_PVC)1276 return fr_add_pvc(dev, pvc.dlci, result);1277 else1278 return fr_del_pvc(hdlc, pvc.dlci, result);1279 }1280 1281 return -EINVAL;1282}1283 1284static int __init hdlc_fr_init(void)1285{1286 register_hdlc_protocol(&proto);1287 return 0;1288}1289 1290static void __exit hdlc_fr_exit(void)1291{1292 unregister_hdlc_protocol(&proto);1293}1294 1295module_init(hdlc_fr_init);1296module_exit(hdlc_fr_exit);1297 1298MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");1299MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");1300MODULE_LICENSE("GPL v2");1301