drivers/infiniband/sw/rxe/rxe_recv.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   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 static int check_type_state(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
  13                             struct rxe_qp *qp)
  14 {
  15         if (unlikely(!qp->valid))
  16                 goto err1;
  17
  18         switch (qp_type(qp)) {
  19         case IB_QPT_RC:
  20                 if (unlikely((pkt->opcode & IB_OPCODE_RC) != 0)) {
  21                         pr_warn_ratelimited("bad qp type\n");
  22                         goto err1;
  23                 }
  24                 break;
  25         case IB_QPT_UC:
  26                 if (unlikely(!(pkt->opcode & IB_OPCODE_UC))) {
  27                         pr_warn_ratelimited("bad qp type\n");
  28                         goto err1;
  29                 }
  30                 break;
  31         case IB_QPT_UD:
  32         case IB_QPT_SMI:
  33         case IB_QPT_GSI:
  34                 if (unlikely(!(pkt->opcode & IB_OPCODE_UD))) {
  35                         pr_warn_ratelimited("bad qp type\n");
  36                         goto err1;
  37                 }
  38                 break;
  39         default:
  40                 pr_warn_ratelimited("unsupported qp type\n");
  41                 goto err1;
  42         }
  43
  44         if (pkt->mask & RXE_REQ_MASK) {
  45                 if (unlikely(qp->resp.state != QP_STATE_READY))
  46                         goto err1;
  47         } else if (unlikely(qp->req.state < QP_STATE_READY ||
  48                                 qp->req.state > QP_STATE_DRAINED)) {
  49                 goto err1;
  50         }
  51
  52         return 0;
  53
  54 err1:
  55         return -EINVAL;
  56 }
  57
  58 static void set_bad_pkey_cntr(struct rxe_port *port)
  59 {
  60         spin_lock_bh(&port->port_lock);
  61         port->attr.bad_pkey_cntr = min((u32)0xffff,
  62                                        port->attr.bad_pkey_cntr + 1);
  63         spin_unlock_bh(&port->port_lock);
  64 }
  65
  66 static void set_qkey_viol_cntr(struct rxe_port *port)
  67 {
  68         spin_lock_bh(&port->port_lock);
  69         port->attr.qkey_viol_cntr = min((u32)0xffff,
  70                                         port->attr.qkey_viol_cntr + 1);
  71         spin_unlock_bh(&port->port_lock);
  72 }
  73
  74 static int check_keys(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
  75                       u32 qpn, struct rxe_qp *qp)
  76 {
  77         struct rxe_port *port = &rxe->port;
  78         u16 pkey = bth_pkey(pkt);
  79
  80         pkt->pkey_index = 0;
  81
  82         if (!pkey_match(pkey, IB_DEFAULT_PKEY_FULL)) {
  83                 pr_warn_ratelimited("bad pkey = 0x%x\n", pkey);
  84                 set_bad_pkey_cntr(port);
  85                 goto err1;
  86         }
  87
  88         if ((qp_type(qp) == IB_QPT_UD || qp_type(qp) == IB_QPT_GSI) &&
  89             pkt->mask) {
  90                 u32 qkey = (qpn == 1) ? GSI_QKEY : qp->attr.qkey;
  91
  92                 if (unlikely(deth_qkey(pkt) != qkey)) {
  93                         pr_warn_ratelimited("bad qkey, got 0x%x expected 0x%x for qpn 0x%x\n",
  94                                             deth_qkey(pkt), qkey, qpn);
  95                         set_qkey_viol_cntr(port);
  96                         goto err1;
  97                 }
  98         }
  99
 100         return 0;
 101
 102 err1:
 103         return -EINVAL;
 104 }
 105
 106 static int check_addr(struct rxe_dev *rxe, struct rxe_pkt_info *pkt,
 107                       struct rxe_qp *qp)
 108 {
 109         struct sk_buff *skb = PKT_TO_SKB(pkt);
 110
 111         if (qp_type(qp) != IB_QPT_RC && qp_type(qp) != IB_QPT_UC)
 112                 goto done;
 113
 114         if (unlikely(pkt->port_num != qp->attr.port_num)) {
 115                 pr_warn_ratelimited("port %d != qp port %d\n",
 116                                     pkt->port_num, qp->attr.port_num);
 117                 goto err1;
 118         }
 119
 120         if (skb->protocol == htons(ETH_P_IP)) {
 121                 struct in_addr *saddr =
 122                         &qp->pri_av.sgid_addr._sockaddr_in.sin_addr;
 123                 struct in_addr *daddr =
 124                         &qp->pri_av.dgid_addr._sockaddr_in.sin_addr;
 125
 126                 if (ip_hdr(skb)->daddr != saddr->s_addr) {
 127                         pr_warn_ratelimited("dst addr %pI4 != qp source addr %pI4\n",
 128                                             &ip_hdr(skb)->daddr,
 129                                             &saddr->s_addr);
 130                         goto err1;
 131                 }
 132
 133                 if (ip_hdr(skb)->saddr != daddr->s_addr) {
 134                         pr_warn_ratelimited("source addr %pI4 != qp dst addr %pI4\n",
 135                                             &ip_hdr(skb)->saddr,
 136                                             &daddr->s_addr);
 137                         goto err1;
 138                 }
 139
 140         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 141                 struct in6_addr *saddr =
 142                         &qp->pri_av.sgid_addr._sockaddr_in6.sin6_addr;
 143                 struct in6_addr *daddr =
 144                         &qp->pri_av.dgid_addr._sockaddr_in6.sin6_addr;
 145
 146                 if (memcmp(&ipv6_hdr(skb)->daddr, saddr, sizeof(*saddr))) {
 147                         pr_warn_ratelimited("dst addr %pI6 != qp source addr %pI6\n",
 148                                             &ipv6_hdr(skb)->daddr, saddr);
 149                         goto err1;
 150                 }
 151
 152                 if (memcmp(&ipv6_hdr(skb)->saddr, daddr, sizeof(*daddr))) {
 153                         pr_warn_ratelimited("source addr %pI6 != qp dst addr %pI6\n",
 154                                             &ipv6_hdr(skb)->saddr, daddr);
 155                         goto err1;
 156                 }
 157         }
 158
 159 done:
 160         return 0;
 161
 162 err1:
 163         return -EINVAL;
 164 }
 165
 166 static int hdr_check(struct rxe_pkt_info *pkt)
 167 {
 168         struct rxe_dev *rxe = pkt->rxe;
 169         struct rxe_port *port = &rxe->port;
 170         struct rxe_qp *qp = NULL;
 171         u32 qpn = bth_qpn(pkt);
 172         int index;
 173         int err;
 174
 175         if (unlikely(bth_tver(pkt) != BTH_TVER)) {
 176                 pr_warn_ratelimited("bad tver\n");
 177                 goto err1;
 178         }
 179
 180         if (unlikely(qpn == 0)) {
 181                 pr_warn_once("QP 0 not supported");
 182                 goto err1;
 183         }
 184
 185         if (qpn != IB_MULTICAST_QPN) {
 186                 index = (qpn == 1) ? port->qp_gsi_index : qpn;
 187
 188                 qp = rxe_pool_get_index(&rxe->qp_pool, index);
 189                 if (unlikely(!qp)) {
 190                         pr_warn_ratelimited("no qp matches qpn 0x%x\n", qpn);
 191                         goto err1;
 192                 }
 193
 194                 err = check_type_state(rxe, pkt, qp);
 195                 if (unlikely(err))
 196                         goto err2;
 197
 198                 err = check_addr(rxe, pkt, qp);
 199                 if (unlikely(err))
 200                         goto err2;
 201
 202                 err = check_keys(rxe, pkt, qpn, qp);
 203                 if (unlikely(err))
 204                         goto err2;
 205         } else {
 206                 if (unlikely((pkt->mask & RXE_GRH_MASK) == 0)) {
 207                         pr_warn_ratelimited("no grh for mcast qpn\n");
 208                         goto err1;
 209                 }
 210         }
 211
 212         pkt->qp = qp;
 213         return 0;
 214
 215 err2:
 216         rxe_drop_ref(qp);
 217 err1:
 218         return -EINVAL;
 219 }
 220
 221 static inline void rxe_rcv_pkt(struct rxe_pkt_info *pkt, struct sk_buff *skb)
 222 {
 223         if (pkt->mask & RXE_REQ_MASK)
 224                 rxe_resp_queue_pkt(pkt->qp, skb);
 225         else
 226                 rxe_comp_queue_pkt(pkt->qp, skb);
 227 }
 228
 229 static void rxe_rcv_mcast_pkt(struct rxe_dev *rxe, struct sk_buff *skb)
 230 {
 231         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 232         struct rxe_mc_grp *mcg;
 233         struct rxe_mc_elem *mce;
 234         struct rxe_qp *qp;
 235         union ib_gid dgid;
 236         struct sk_buff *per_qp_skb;
 237         struct rxe_pkt_info *per_qp_pkt;
 238         int err;
 239
 240         if (skb->protocol == htons(ETH_P_IP))
 241                 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
 242                                        (struct in6_addr *)&dgid);
 243         else if (skb->protocol == htons(ETH_P_IPV6))
 244                 memcpy(&dgid, &ipv6_hdr(skb)->daddr, sizeof(dgid));
 245
 246         /* lookup mcast group corresponding to mgid, takes a ref */
 247         mcg = rxe_pool_get_key(&rxe->mc_grp_pool, &dgid);
 248         if (!mcg)
 249                 goto err1;      /* mcast group not registered */
 250
 251         spin_lock_bh(&mcg->mcg_lock);
 252
 253         list_for_each_entry(mce, &mcg->qp_list, qp_list) {
 254                 qp = mce->qp;
 255                 pkt = SKB_TO_PKT(skb);
 256
 257                 /* validate qp for incoming packet */
 258                 err = check_type_state(rxe, pkt, qp);
 259                 if (err)
 260                         continue;
 261
 262                 err = check_keys(rxe, pkt, bth_qpn(pkt), qp);
 263                 if (err)
 264                         continue;
 265
 266                 /* for all but the last qp create a new clone of the
 267                  * skb and pass to the qp.
 268                  */
 269                 if (mce->qp_list.next != &mcg->qp_list)
 270                         per_qp_skb = skb_clone(skb, GFP_ATOMIC);
 271                 else
 272                         per_qp_skb = skb;
 273
 274                 if (unlikely(!per_qp_skb))
 275                         continue;
 276
 277                 per_qp_pkt = SKB_TO_PKT(per_qp_skb);
 278                 per_qp_pkt->qp = qp;
 279                 rxe_add_ref(qp);
 280                 rxe_rcv_pkt(per_qp_pkt, per_qp_skb);
 281         }
 282
 283         spin_unlock_bh(&mcg->mcg_lock);
 284
 285         rxe_drop_ref(mcg);      /* drop ref from rxe_pool_get_key. */
 286
 287         return;
 288
 289 err1:
 290         kfree_skb(skb);
 291 }
 292
 293 /**
 294  * rxe_chk_dgid - validate destination IP address
 295  * @rxe: rxe device that received packet
 296  * @skb: the received packet buffer
 297  *
 298  * Accept any loopback packets
 299  * Extract IP address from packet and
 300  * Accept if multicast packet
 301  * Accept if matches an SGID table entry
 302  */
 303 static int rxe_chk_dgid(struct rxe_dev *rxe, struct sk_buff *skb)
 304 {
 305         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 306         const struct ib_gid_attr *gid_attr;
 307         union ib_gid dgid;
 308         union ib_gid *pdgid;
 309
 310         if (pkt->mask & RXE_LOOPBACK_MASK)
 311                 return 0;
 312
 313         if (skb->protocol == htons(ETH_P_IP)) {
 314                 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
 315                                        (struct in6_addr *)&dgid);
 316                 pdgid = &dgid;
 317         } else {
 318                 pdgid = (union ib_gid *)&ipv6_hdr(skb)->daddr;
 319         }
 320
 321         if (rdma_is_multicast_addr((struct in6_addr *)pdgid))
 322                 return 0;
 323
 324         gid_attr = rdma_find_gid_by_port(&rxe->ib_dev, pdgid,
 325                                          IB_GID_TYPE_ROCE_UDP_ENCAP,
 326                                          1, skb->dev);
 327         if (IS_ERR(gid_attr))
 328                 return PTR_ERR(gid_attr);
 329
 330         rdma_put_gid_attr(gid_attr);
 331         return 0;
 332 }
 333
 334 /* rxe_rcv is called from the interface driver */
 335 void rxe_rcv(struct sk_buff *skb)
 336 {
 337         int err;
 338         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 339         struct rxe_dev *rxe = pkt->rxe;
 340         __be32 *icrcp;
 341         u32 calc_icrc, pack_icrc;
 342
 343         pkt->offset = 0;
 344
 345         if (unlikely(skb->len < pkt->offset + RXE_BTH_BYTES))
 346                 goto drop;
 347
 348         if (rxe_chk_dgid(rxe, skb) < 0) {
 349                 pr_warn_ratelimited("failed checking dgid\n");
 350                 goto drop;
 351         }
 352
 353         pkt->opcode = bth_opcode(pkt);
 354         pkt->psn = bth_psn(pkt);
 355         pkt->qp = NULL;
 356         pkt->mask |= rxe_opcode[pkt->opcode].mask;
 357
 358         if (unlikely(skb->len < header_size(pkt)))
 359                 goto drop;
 360
 361         err = hdr_check(pkt);
 362         if (unlikely(err))
 363                 goto drop;
 364
 365         /* Verify ICRC */
 366         icrcp = (__be32 *)(pkt->hdr + pkt->paylen - RXE_ICRC_SIZE);
 367         pack_icrc = be32_to_cpu(*icrcp);
 368
 369         calc_icrc = rxe_icrc_hdr(pkt, skb);
 370         calc_icrc = rxe_crc32(rxe, calc_icrc, (u8 *)payload_addr(pkt),
 371                               payload_size(pkt) + bth_pad(pkt));
 372         calc_icrc = (__force u32)cpu_to_be32(~calc_icrc);
 373         if (unlikely(calc_icrc != pack_icrc)) {
 374                 if (skb->protocol == htons(ETH_P_IPV6))
 375                         pr_warn_ratelimited("bad ICRC from %pI6c\n",
 376                                             &ipv6_hdr(skb)->saddr);
 377                 else if (skb->protocol == htons(ETH_P_IP))
 378                         pr_warn_ratelimited("bad ICRC from %pI4\n",
 379                                             &ip_hdr(skb)->saddr);
 380                 else
 381                         pr_warn_ratelimited("bad ICRC from unknown\n");
 382
 383                 goto drop;
 384         }
 385
 386         rxe_counter_inc(rxe, RXE_CNT_RCVD_PKTS);
 387
 388         if (unlikely(bth_qpn(pkt) == IB_MULTICAST_QPN))
 389                 rxe_rcv_mcast_pkt(rxe, skb);
 390         else
 391                 rxe_rcv_pkt(pkt, skb);
 392
 393         return;
 394
 395 drop:
 396         if (pkt->qp)
 397                 rxe_drop_ref(pkt->qp);
 398
 399         kfree_skb(skb);
 400 }