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1// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB2/*3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.5 */6 7#include <linux/skbuff.h>8 9#include "rxe.h"10#include "rxe_loc.h"11 12/* check that QP matches packet opcode type and is in a valid state */13static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,14 struct rxe_qp *qp)15{16 unsigned int pkt_type;17 unsigned long flags;18 19 if (unlikely(!qp->valid))20 return -EINVAL;21 22 pkt_type = pkt->opcode & 0xe0;23 24 switch (qp_type(qp)) {25 case IB_QPT_RC:26 if (unlikely(pkt_type != IB_OPCODE_RC))27 return -EINVAL;28 break;29 case IB_QPT_UC:30 if (unlikely(pkt_type != IB_OPCODE_UC))31 return -EINVAL;32 break;33 case IB_QPT_UD:34 case IB_QPT_GSI:35 if (unlikely(pkt_type != IB_OPCODE_UD))36 return -EINVAL;37 break;38 default:39 return -EINVAL;40 }41 42 spin_lock_irqsave(&qp->state_lock, flags);43 if (pkt->mask & RXE_REQ_MASK) {44 if (unlikely(qp_state(qp) < IB_QPS_RTR)) {45 spin_unlock_irqrestore(&qp->state_lock, flags);46 return -EINVAL;47 }48 } else {49 if (unlikely(qp_state(qp) < IB_QPS_RTS)) {50 spin_unlock_irqrestore(&qp->state_lock, flags);51 return -EINVAL;52 }53 }54 spin_unlock_irqrestore(&qp->state_lock, flags);55 56 return 0;57}58 59static void set_bad_pkey_cntr(struct rxe_port *port)60{61 spin_lock_bh(&port->port_lock);62 port->attr.bad_pkey_cntr = min((u32)0xffff,63 port->attr.bad_pkey_cntr + 1);64 spin_unlock_bh(&port->port_lock);65}66 67static void set_qkey_viol_cntr(struct rxe_port *port)68{69 spin_lock_bh(&port->port_lock);70 port->attr.qkey_viol_cntr = min((u32)0xffff,71 port->attr.qkey_viol_cntr + 1);72 spin_unlock_bh(&port->port_lock);73}74 75static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,76 u32 qpn, struct rxe_qp *qp)77{78 struct rxe_port *port = &rxe->port;79 u16 pkey = bth_pkey(pkt);80 81 pkt->pkey_index = 0;82 83 if (!pkey_match(pkey, IB_DEFAULT_PKEY_FULL)) {84 set_bad_pkey_cntr(port);85 return -EINVAL;86 }87 88 if (qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) {89 u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;90 91 if (unlikely(deth_qkey(pkt) != qkey)) {92 set_qkey_viol_cntr(port);93 return -EINVAL;94 }95 }96 97 return 0;98}99 100static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,101 struct rxe_qp *qp)102{103 struct sk_buff *skb = PKT_TO_SKB(pkt);104 105 if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)106 return 0;107 108 if (unlikely(pkt->port_num != qp->attr.port_num))109 return -EINVAL;110 111 if (skb->protocol == htons(ETH_P_IP)) {112 struct in_addr *saddr =113 &qp->pri_av.sgid_addr._sockaddr_in.sin_addr;114 struct in_addr *daddr =115 &qp->pri_av.dgid_addr._sockaddr_in.sin_addr;116 117 if ((ip_hdr(skb)->daddr != saddr->s_addr) ||118 (ip_hdr(skb)->saddr != daddr->s_addr))119 return -EINVAL;120 121 } else if (skb->protocol == htons(ETH_P_IPV6)) {122 struct in6_addr *saddr =123 &qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;124 struct in6_addr *daddr =125 &qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;126 127 if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr)) ||128 memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr)))129 return -EINVAL;130 }131 132 return 0;133}134 135static int hdr_check(struct rxe_pkt_info *pkt)136{137 struct rxe_dev *rxe = pkt->rxe;138 struct rxe_port *port = &rxe->port;139 struct rxe_qp *qp = NULL;140 u32 qpn = bth_qpn(pkt);141 int index;142 int err;143 144 if (unlikely(bth_tver(pkt) != BTH_TVER))145 goto err1;146 147 if (unlikely(qpn == 0))148 goto err1;149 150 if (qpn != IB_MULTICAST_QPN) {151 index = (qpn == 1) ? port->qp_gsi_index : qpn;152 153 qp = rxe_pool_get_index(&rxe->qp_pool, index);154 if (unlikely(!qp))155 goto err1;156 157 err = check_type_state(rxe, pkt, qp);158 if (unlikely(err))159 goto err2;160 161 err = check_addr(rxe, pkt, qp);162 if (unlikely(err))163 goto err2;164 165 err = check_keys(rxe, pkt, qpn, qp);166 if (unlikely(err))167 goto err2;168 } else {169 if (unlikely((pkt->mask & RXE_GRH_MASK) == 0))170 goto err1;171 }172 173 pkt->qp = qp;174 return 0;175 176err2:177 rxe_put(qp);178err1:179 return -EINVAL;180}181 182static inline void rxe_rcv_pkt(struct rxe_pkt_info *pkt, struct sk_buff *skb)183{184 if (pkt->mask & RXE_REQ_MASK)185 rxe_resp_queue_pkt(pkt->qp, skb);186 else187 rxe_comp_queue_pkt(pkt->qp, skb);188}189 190static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)191{192 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);193 struct rxe_mcg *mcg;194 struct rxe_mca *mca;195 struct rxe_qp *qp;196 union ib_gid dgid;197 int err;198 199 if (skb->protocol == htons(ETH_P_IP))200 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,201 (struct in6_addr *)&dgid);202 else if (skb->protocol == htons(ETH_P_IPV6))203 memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));204 205 /* lookup mcast group corresponding to mgid, takes a ref */206 mcg = rxe_lookup_mcg(rxe, &dgid);207 if (!mcg)208 goto drop; /* mcast group not registered */209 210 spin_lock_bh(&rxe->mcg_lock);211 212 /* this is unreliable datagram service so we let213 * failures to deliver a multicast packet to a214 * single QP happen and just move on and try215 * the rest of them on the list216 */217 list_for_each_entry(mca, &mcg->qp_list, qp_list) {218 qp = mca->qp;219 220 /* validate qp for incoming packet */221 err = check_type_state(rxe, pkt, qp);222 if (err)223 continue;224 225 err = check_keys(rxe, pkt, bth_qpn(pkt), qp);226 if (err)227 continue;228 229 /* for all but the last QP create a new clone of the230 * skb and pass to the QP. Pass the original skb to231 * the last QP in the list.232 */233 if (mca->qp_list.next != &mcg->qp_list) {234 struct sk_buff *cskb;235 struct rxe_pkt_info *cpkt;236 237 cskb = skb_clone(skb, GFP_ATOMIC);238 if (unlikely(!cskb))239 continue;240 241 if (WARN_ON(!ib_device_try_get(&rxe->ib_dev))) {242 kfree_skb(cskb);243 break;244 }245 246 cpkt = SKB_TO_PKT(cskb);247 cpkt->qp = qp;248 rxe_get(qp);249 rxe_rcv_pkt(cpkt, cskb);250 } else {251 pkt->qp = qp;252 rxe_get(qp);253 rxe_rcv_pkt(pkt, skb);254 skb = NULL; /* mark consumed */255 }256 }257 258 spin_unlock_bh(&rxe->mcg_lock);259 260 kref_put(&mcg->ref_cnt, rxe_cleanup_mcg);261 262 if (likely(!skb))263 return;264 265 /* This only occurs if one of the checks fails on the last266 * QP in the list above267 */268 269drop:270 kfree_skb(skb);271 ib_device_put(&rxe->ib_dev);272}273 274/**275 * rxe_chk_dgid - validate destination IP address276 * @rxe: rxe device that received packet277 * @skb: the received packet buffer278 *279 * Accept any loopback packets280 * Extract IP address from packet and281 * Accept if multicast packet282 * Accept if matches an SGID table entry283 */284static int rxe_chk_dgid(struct rxe_dev *rxe, struct sk_buff *skb)285{286 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);287 const struct ib_gid_attr *gid_attr;288 union ib_gid dgid;289 union ib_gid *pdgid;290 291 if (pkt->mask & RXE_LOOPBACK_MASK)292 return 0;293 294 if (skb->protocol == htons(ETH_P_IP)) {295 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,296 (struct in6_addr *)&dgid);297 pdgid = &dgid;298 } else {299 pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;300 }301 302 if (rdma_is_multicast_addr((struct in6_addr *)pdgid))303 return 0;304 305 gid_attr = rdma_find_gid_by_port(&rxe->ib_dev, pdgid,306 IB_GID_TYPE_ROCE_UDP_ENCAP,307 1, skb->dev);308 if (IS_ERR(gid_attr))309 return PTR_ERR(gid_attr);310 311 rdma_put_gid_attr(gid_attr);312 return 0;313}314 315/* rxe_rcv is called from the interface driver */316void rxe_rcv(struct sk_buff *skb)317{318 int err;319 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);320 struct rxe_dev *rxe = pkt->rxe;321 322 if (unlikely(skb->len < RXE_BTH_BYTES))323 goto drop;324 325 if (rxe_chk_dgid(rxe, skb) < 0)326 goto drop;327 328 pkt->opcode = bth_opcode(pkt);329 pkt->psn = bth_psn(pkt);330 pkt->qp = NULL;331 pkt->mask |= rxe_opcode[pkt->opcode].mask;332 333 if (unlikely(skb->len < header_size(pkt)))334 goto drop;335 336 err = hdr_check(pkt);337 if (unlikely(err))338 goto drop;339 340 err = rxe_icrc_check(skb, pkt);341 if (unlikely(err))342 goto drop;343 344 rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);345 346 if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))347 rxe_rcv_mcast_pkt(rxe, skb);348 else349 rxe_rcv_pkt(pkt, skb);350 351 return;352 353drop:354 if (pkt->qp)355 rxe_put(pkt->qp);356 357 kfree_skb(skb);358 ib_device_put(&rxe->ib_dev);359}360