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 #include <linux/if_arp.h> 9 #include <linux/netdevice.h> 10 #include <linux/if.h> 11 #include <linux/if_vlan.h> 12 #include <net/udp_tunnel.h> 13 #include <net/sch_generic.h> 14 #include <linux/netfilter.h> 15 #include <rdma/ib_addr.h> 16 17 #include "rxe.h" 18 #include "rxe_net.h" 19 #include "rxe_loc.h" 20 21 static struct rxe_recv_sockets recv_sockets; 22 23 static struct dst_entry *rxe_find_route4(struct rxe_qp *qp, 24 struct net_device *ndev, 25 struct in_addr *saddr, 26 struct in_addr *daddr) 27 { 28 struct rtable *rt; 29 struct flowi4 fl = { { 0 } }; 30 31 memset(&fl, 0, sizeof(fl)); 32 fl.flowi4_oif = ndev->ifindex; 33 memcpy(&fl.saddr, saddr, sizeof(*saddr)); 34 memcpy(&fl.daddr, daddr, sizeof(*daddr)); 35 fl.flowi4_proto = IPPROTO_UDP; 36 37 rt = ip_route_output_key(&init_net, &fl); 38 if (IS_ERR(rt)) { 39 rxe_dbg_qp(qp, "no route to %pI4\n", &daddr->s_addr); 40 return NULL; 41 } 42 43 return &rt->dst; 44 } 45 46 #if IS_ENABLED(CONFIG_IPV6) 47 static struct dst_entry *rxe_find_route6(struct rxe_qp *qp, 48 struct net_device *ndev, 49 struct in6_addr *saddr, 50 struct in6_addr *daddr) 51 { 52 struct dst_entry *ndst; 53 struct flowi6 fl6 = { { 0 } }; 54 55 memset(&fl6, 0, sizeof(fl6)); 56 fl6.flowi6_oif = ndev->ifindex; 57 memcpy(&fl6.saddr, saddr, sizeof(*saddr)); 58 memcpy(&fl6.daddr, daddr, sizeof(*daddr)); 59 fl6.flowi6_proto = IPPROTO_UDP; 60 61 ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk), 62 recv_sockets.sk6->sk, &fl6, 63 NULL); 64 if (IS_ERR(ndst)) { 65 rxe_dbg_qp(qp, "no route to %pI6\n", daddr); 66 return NULL; 67 } 68 69 if (unlikely(ndst->error)) { 70 rxe_dbg_qp(qp, "no route to %pI6\n", daddr); 71 goto put; 72 } 73 74 return ndst; 75 put: 76 dst_release(ndst); 77 return NULL; 78 } 79 80 #else 81 82 static struct dst_entry *rxe_find_route6(struct rxe_qp *qp, 83 struct net_device *ndev, 84 struct in6_addr *saddr, 85 struct in6_addr *daddr) 86 { 87 return NULL; 88 } 89 90 #endif 91 92 static struct dst_entry *rxe_find_route(struct net_device *ndev, 93 struct rxe_qp *qp, 94 struct rxe_av *av) 95 { 96 struct dst_entry *dst = NULL; 97 98 if (qp_type(qp) == IB_QPT_RC) 99 dst = sk_dst_get(qp->sk->sk); 100 101 if (!dst || !dst_check(dst, qp->dst_cookie)) { 102 if (dst) 103 dst_release(dst); 104 105 if (av->network_type == RXE_NETWORK_TYPE_IPV4) { 106 struct in_addr *saddr; 107 struct in_addr *daddr; 108 109 saddr = &av->sgid_addr._sockaddr_in.sin_addr; 110 daddr = &av->dgid_addr._sockaddr_in.sin_addr; 111 dst = rxe_find_route4(qp, ndev, saddr, daddr); 112 } else if (av->network_type == RXE_NETWORK_TYPE_IPV6) { 113 struct in6_addr *saddr6; 114 struct in6_addr *daddr6; 115 116 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr; 117 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr; 118 dst = rxe_find_route6(qp, ndev, saddr6, daddr6); 119 #if IS_ENABLED(CONFIG_IPV6) 120 if (dst) 121 qp->dst_cookie = 122 rt6_get_cookie((struct rt6_info *)dst); 123 #endif 124 } 125 126 if (dst && (qp_type(qp) == IB_QPT_RC)) { 127 dst_hold(dst); 128 sk_dst_set(qp->sk->sk, dst); 129 } 130 } 131 return dst; 132 } 133 134 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 135 { 136 struct udphdr *udph; 137 struct rxe_dev *rxe; 138 struct net_device *ndev = skb->dev; 139 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 140 141 /* takes a reference on rxe->ib_dev 142 * drop when skb is freed 143 */ 144 rxe = rxe_get_dev_from_net(ndev); 145 if (!rxe && is_vlan_dev(ndev)) 146 rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev)); 147 if (!rxe) 148 goto drop; 149 150 if (skb_linearize(skb)) { 151 ib_device_put(&rxe->ib_dev); 152 goto drop; 153 } 154 155 udph = udp_hdr(skb); 156 pkt->rxe = rxe; 157 pkt->port_num = 1; 158 pkt->hdr = (u8 *)(udph + 1); 159 pkt->mask = RXE_GRH_MASK; 160 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph); 161 162 /* remove udp header */ 163 skb_pull(skb, sizeof(struct udphdr)); 164 165 rxe_rcv(skb); 166 167 return 0; 168 drop: 169 kfree_skb(skb); 170 171 return 0; 172 } 173 174 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port, 175 bool ipv6) 176 { 177 int err; 178 struct socket *sock; 179 struct udp_port_cfg udp_cfg = { }; 180 struct udp_tunnel_sock_cfg tnl_cfg = { }; 181 182 if (ipv6) { 183 udp_cfg.family = AF_INET6; 184 udp_cfg.ipv6_v6only = 1; 185 } else { 186 udp_cfg.family = AF_INET; 187 } 188 189 udp_cfg.local_udp_port = port; 190 191 /* Create UDP socket */ 192 err = udp_sock_create(net, &udp_cfg, &sock); 193 if (err < 0) 194 return ERR_PTR(err); 195 196 tnl_cfg.encap_type = 1; 197 tnl_cfg.encap_rcv = rxe_udp_encap_recv; 198 199 /* Setup UDP tunnel */ 200 setup_udp_tunnel_sock(net, sock, &tnl_cfg); 201 202 return sock; 203 } 204 205 static void rxe_release_udp_tunnel(struct socket *sk) 206 { 207 if (sk) 208 udp_tunnel_sock_release(sk); 209 } 210 211 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port, 212 __be16 dst_port) 213 { 214 struct udphdr *udph; 215 216 __skb_push(skb, sizeof(*udph)); 217 skb_reset_transport_header(skb); 218 udph = udp_hdr(skb); 219 220 udph->dest = dst_port; 221 udph->source = src_port; 222 udph->len = htons(skb->len); 223 udph->check = 0; 224 } 225 226 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb, 227 __be32 saddr, __be32 daddr, __u8 proto, 228 __u8 tos, __u8 ttl, __be16 df, bool xnet) 229 { 230 struct iphdr *iph; 231 232 skb_scrub_packet(skb, xnet); 233 234 skb_clear_hash(skb); 235 skb_dst_set(skb, dst_clone(dst)); 236 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 237 238 skb_push(skb, sizeof(struct iphdr)); 239 skb_reset_network_header(skb); 240 241 iph = ip_hdr(skb); 242 243 iph->version = IPVERSION; 244 iph->ihl = sizeof(struct iphdr) >> 2; 245 iph->tot_len = htons(skb->len); 246 iph->frag_off = df; 247 iph->protocol = proto; 248 iph->tos = tos; 249 iph->daddr = daddr; 250 iph->saddr = saddr; 251 iph->ttl = ttl; 252 __ip_select_ident(dev_net(dst->dev), iph, 253 skb_shinfo(skb)->gso_segs ?: 1); 254 } 255 256 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb, 257 struct in6_addr *saddr, struct in6_addr *daddr, 258 __u8 proto, __u8 prio, __u8 ttl) 259 { 260 struct ipv6hdr *ip6h; 261 262 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 263 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED 264 | IPSKB_REROUTED); 265 skb_dst_set(skb, dst_clone(dst)); 266 267 __skb_push(skb, sizeof(*ip6h)); 268 skb_reset_network_header(skb); 269 ip6h = ipv6_hdr(skb); 270 ip6_flow_hdr(ip6h, prio, htonl(0)); 271 ip6h->payload_len = htons(skb->len); 272 ip6h->nexthdr = proto; 273 ip6h->hop_limit = ttl; 274 ip6h->daddr = *daddr; 275 ip6h->saddr = *saddr; 276 ip6h->payload_len = htons(skb->len - sizeof(*ip6h)); 277 } 278 279 static int prepare4(struct rxe_av *av, struct rxe_pkt_info *pkt, 280 struct sk_buff *skb) 281 { 282 struct rxe_qp *qp = pkt->qp; 283 struct dst_entry *dst; 284 bool xnet = false; 285 __be16 df = htons(IP_DF); 286 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr; 287 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr; 288 289 dst = rxe_find_route(skb->dev, qp, av); 290 if (!dst) { 291 rxe_dbg_qp(qp, "Host not reachable\n"); 292 return -EHOSTUNREACH; 293 } 294 295 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port), 296 cpu_to_be16(ROCE_V2_UDP_DPORT)); 297 298 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP, 299 av->grh.traffic_class, av->grh.hop_limit, df, xnet); 300 301 dst_release(dst); 302 return 0; 303 } 304 305 static int prepare6(struct rxe_av *av, struct rxe_pkt_info *pkt, 306 struct sk_buff *skb) 307 { 308 struct rxe_qp *qp = pkt->qp; 309 struct dst_entry *dst; 310 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr; 311 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr; 312 313 dst = rxe_find_route(skb->dev, qp, av); 314 if (!dst) { 315 rxe_dbg_qp(qp, "Host not reachable\n"); 316 return -EHOSTUNREACH; 317 } 318 319 prepare_udp_hdr(skb, cpu_to_be16(qp->src_port), 320 cpu_to_be16(ROCE_V2_UDP_DPORT)); 321 322 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP, 323 av->grh.traffic_class, 324 av->grh.hop_limit); 325 326 dst_release(dst); 327 return 0; 328 } 329 330 int rxe_prepare(struct rxe_av *av, struct rxe_pkt_info *pkt, 331 struct sk_buff *skb) 332 { 333 int err = 0; 334 335 if (skb->protocol == htons(ETH_P_IP)) 336 err = prepare4(av, pkt, skb); 337 else if (skb->protocol == htons(ETH_P_IPV6)) 338 err = prepare6(av, pkt, skb); 339 340 if (ether_addr_equal(skb->dev->dev_addr, av->dmac)) 341 pkt->mask |= RXE_LOOPBACK_MASK; 342 343 return err; 344 } 345 346 static void rxe_skb_tx_dtor(struct sk_buff *skb) 347 { 348 struct sock *sk = skb->sk; 349 struct rxe_qp *qp = sk->sk_user_data; 350 int skb_out = atomic_dec_return(&qp->skb_out); 351 352 if (unlikely(qp->need_req_skb && 353 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW)) 354 rxe_sched_task(&qp->req.task); 355 356 rxe_put(qp); 357 } 358 359 static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt) 360 { 361 int err; 362 363 skb->destructor = rxe_skb_tx_dtor; 364 skb->sk = pkt->qp->sk->sk; 365 366 rxe_get(pkt->qp); 367 atomic_inc(&pkt->qp->skb_out); 368 369 if (skb->protocol == htons(ETH_P_IP)) { 370 err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 371 } else if (skb->protocol == htons(ETH_P_IPV6)) { 372 err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); 373 } else { 374 rxe_dbg_qp(pkt->qp, "Unknown layer 3 protocol: %d\n", 375 skb->protocol); 376 atomic_dec(&pkt->qp->skb_out); 377 rxe_put(pkt->qp); 378 kfree_skb(skb); 379 return -EINVAL; 380 } 381 382 if (unlikely(net_xmit_eval(err))) { 383 rxe_dbg_qp(pkt->qp, "error sending packet: %d\n", err); 384 return -EAGAIN; 385 } 386 387 return 0; 388 } 389 390 /* fix up a send packet to match the packets 391 * received from UDP before looping them back 392 */ 393 static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt) 394 { 395 memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt)); 396 397 if (skb->protocol == htons(ETH_P_IP)) 398 skb_pull(skb, sizeof(struct iphdr)); 399 else 400 skb_pull(skb, sizeof(struct ipv6hdr)); 401 402 if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) { 403 kfree_skb(skb); 404 return -EIO; 405 } 406 407 /* remove udp header */ 408 skb_pull(skb, sizeof(struct udphdr)); 409 410 rxe_rcv(skb); 411 412 return 0; 413 } 414 415 int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 416 struct sk_buff *skb) 417 { 418 int err; 419 int is_request = pkt->mask & RXE_REQ_MASK; 420 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 421 unsigned long flags; 422 423 spin_lock_irqsave(&qp->state_lock, flags); 424 if ((is_request && (qp_state(qp) < IB_QPS_RTS)) || 425 (!is_request && (qp_state(qp) < IB_QPS_RTR))) { 426 spin_unlock_irqrestore(&qp->state_lock, flags); 427 rxe_dbg_qp(qp, "Packet dropped. QP is not in ready state\n"); 428 goto drop; 429 } 430 spin_unlock_irqrestore(&qp->state_lock, flags); 431 432 rxe_icrc_generate(skb, pkt); 433 434 if (pkt->mask & RXE_LOOPBACK_MASK) 435 err = rxe_loopback(skb, pkt); 436 else 437 err = rxe_send(skb, pkt); 438 if (err) { 439 rxe_counter_inc(rxe, RXE_CNT_SEND_ERR); 440 return err; 441 } 442 443 if ((qp_type(qp) != IB_QPT_RC) && 444 (pkt->mask & RXE_END_MASK)) { 445 pkt->wqe->state = wqe_state_done; 446 rxe_sched_task(&qp->comp.task); 447 } 448 449 rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS); 450 goto done; 451 452 drop: 453 kfree_skb(skb); 454 err = 0; 455 done: 456 return err; 457 } 458 459 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av, 460 int paylen, struct rxe_pkt_info *pkt) 461 { 462 unsigned int hdr_len; 463 struct sk_buff *skb = NULL; 464 struct net_device *ndev; 465 const struct ib_gid_attr *attr; 466 const int port_num = 1; 467 468 attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index); 469 if (IS_ERR(attr)) 470 return NULL; 471 472 if (av->network_type == RXE_NETWORK_TYPE_IPV4) 473 hdr_len = ETH_HLEN + sizeof(struct udphdr) + 474 sizeof(struct iphdr); 475 else 476 hdr_len = ETH_HLEN + sizeof(struct udphdr) + 477 sizeof(struct ipv6hdr); 478 479 rcu_read_lock(); 480 ndev = rdma_read_gid_attr_ndev_rcu(attr); 481 if (IS_ERR(ndev)) { 482 rcu_read_unlock(); 483 goto out; 484 } 485 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev), 486 GFP_ATOMIC); 487 488 if (unlikely(!skb)) { 489 rcu_read_unlock(); 490 goto out; 491 } 492 493 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev)); 494 495 /* FIXME: hold reference to this netdev until life of this skb. */ 496 skb->dev = ndev; 497 rcu_read_unlock(); 498 499 if (av->network_type == RXE_NETWORK_TYPE_IPV4) 500 skb->protocol = htons(ETH_P_IP); 501 else 502 skb->protocol = htons(ETH_P_IPV6); 503 504 pkt->rxe = rxe; 505 pkt->port_num = port_num; 506 pkt->hdr = skb_put(skb, paylen); 507 pkt->mask |= RXE_GRH_MASK; 508 509 out: 510 rdma_put_gid_attr(attr); 511 return skb; 512 } 513 514 /* 515 * this is required by rxe_cfg to match rxe devices in 516 * /sys/class/infiniband up with their underlying ethernet devices 517 */ 518 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num) 519 { 520 return rxe->ndev->name; 521 } 522 523 int rxe_net_add(const char *ibdev_name, struct net_device *ndev) 524 { 525 int err; 526 struct rxe_dev *rxe = NULL; 527 528 rxe = ib_alloc_device(rxe_dev, ib_dev); 529 if (!rxe) 530 return -ENOMEM; 531 532 rxe->ndev = ndev; 533 534 err = rxe_add(rxe, ndev->mtu, ibdev_name); 535 if (err) { 536 ib_dealloc_device(&rxe->ib_dev); 537 return err; 538 } 539 540 return 0; 541 } 542 543 static void rxe_port_event(struct rxe_dev *rxe, 544 enum ib_event_type event) 545 { 546 struct ib_event ev; 547 548 ev.device = &rxe->ib_dev; 549 ev.element.port_num = 1; 550 ev.event = event; 551 552 ib_dispatch_event(&ev); 553 } 554 555 /* Caller must hold net_info_lock */ 556 void rxe_port_up(struct rxe_dev *rxe) 557 { 558 struct rxe_port *port; 559 560 port = &rxe->port; 561 port->attr.state = IB_PORT_ACTIVE; 562 563 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE); 564 dev_info(&rxe->ib_dev.dev, "set active\n"); 565 } 566 567 /* Caller must hold net_info_lock */ 568 void rxe_port_down(struct rxe_dev *rxe) 569 { 570 struct rxe_port *port; 571 572 port = &rxe->port; 573 port->attr.state = IB_PORT_DOWN; 574 575 rxe_port_event(rxe, IB_EVENT_PORT_ERR); 576 rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED); 577 dev_info(&rxe->ib_dev.dev, "set down\n"); 578 } 579 580 void rxe_set_port_state(struct rxe_dev *rxe) 581 { 582 if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev)) 583 rxe_port_up(rxe); 584 else 585 rxe_port_down(rxe); 586 } 587 588 static int rxe_notify(struct notifier_block *not_blk, 589 unsigned long event, 590 void *arg) 591 { 592 struct net_device *ndev = netdev_notifier_info_to_dev(arg); 593 struct rxe_dev *rxe = rxe_get_dev_from_net(ndev); 594 595 if (!rxe) 596 return NOTIFY_OK; 597 598 switch (event) { 599 case NETDEV_UNREGISTER: 600 ib_unregister_device_queued(&rxe->ib_dev); 601 break; 602 case NETDEV_UP: 603 rxe_port_up(rxe); 604 break; 605 case NETDEV_DOWN: 606 rxe_port_down(rxe); 607 break; 608 case NETDEV_CHANGEMTU: 609 rxe_dbg_dev(rxe, "%s changed mtu to %d\n", ndev->name, ndev->mtu); 610 rxe_set_mtu(rxe, ndev->mtu); 611 break; 612 case NETDEV_CHANGE: 613 rxe_set_port_state(rxe); 614 break; 615 case NETDEV_REBOOT: 616 case NETDEV_GOING_DOWN: 617 case NETDEV_CHANGEADDR: 618 case NETDEV_CHANGENAME: 619 case NETDEV_FEAT_CHANGE: 620 default: 621 rxe_dbg_dev(rxe, "ignoring netdev event = %ld for %s\n", 622 event, ndev->name); 623 break; 624 } 625 626 ib_device_put(&rxe->ib_dev); 627 return NOTIFY_OK; 628 } 629 630 static struct notifier_block rxe_net_notifier = { 631 .notifier_call = rxe_notify, 632 }; 633 634 static int rxe_net_ipv4_init(void) 635 { 636 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net, 637 htons(ROCE_V2_UDP_DPORT), false); 638 if (IS_ERR(recv_sockets.sk4)) { 639 recv_sockets.sk4 = NULL; 640 pr_err("Failed to create IPv4 UDP tunnel\n"); 641 return -1; 642 } 643 644 return 0; 645 } 646 647 static int rxe_net_ipv6_init(void) 648 { 649 #if IS_ENABLED(CONFIG_IPV6) 650 651 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net, 652 htons(ROCE_V2_UDP_DPORT), true); 653 if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) { 654 recv_sockets.sk6 = NULL; 655 pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n"); 656 return 0; 657 } 658 659 if (IS_ERR(recv_sockets.sk6)) { 660 recv_sockets.sk6 = NULL; 661 pr_err("Failed to create IPv6 UDP tunnel\n"); 662 return -1; 663 } 664 #endif 665 return 0; 666 } 667 668 void rxe_net_exit(void) 669 { 670 rxe_release_udp_tunnel(recv_sockets.sk6); 671 rxe_release_udp_tunnel(recv_sockets.sk4); 672 unregister_netdevice_notifier(&rxe_net_notifier); 673 } 674 675 int rxe_net_init(void) 676 { 677 int err; 678 679 recv_sockets.sk6 = NULL; 680 681 err = rxe_net_ipv4_init(); 682 if (err) 683 return err; 684 err = rxe_net_ipv6_init(); 685 if (err) 686 goto err_out; 687 err = register_netdevice_notifier(&rxe_net_notifier); 688 if (err) { 689 pr_err("Failed to register netdev notifier\n"); 690 goto err_out; 691 } 692 return 0; 693 err_out: 694 rxe_net_exit(); 695 return err; 696 } 697