1 /* 2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. 3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/skbuff.h> 35 #include <linux/if_arp.h> 36 #include <linux/netdevice.h> 37 #include <linux/if.h> 38 #include <linux/if_vlan.h> 39 #include <net/udp_tunnel.h> 40 #include <net/sch_generic.h> 41 #include <linux/netfilter.h> 42 #include <rdma/ib_addr.h> 43 44 #include "rxe.h" 45 #include "rxe_net.h" 46 #include "rxe_loc.h" 47 48 static LIST_HEAD(rxe_dev_list); 49 static DEFINE_SPINLOCK(dev_list_lock); /* spinlock for device list */ 50 51 struct rxe_dev *net_to_rxe(struct net_device *ndev) 52 { 53 struct rxe_dev *rxe; 54 struct rxe_dev *found = NULL; 55 56 spin_lock_bh(&dev_list_lock); 57 list_for_each_entry(rxe, &rxe_dev_list, list) { 58 if (rxe->ndev == ndev) { 59 found = rxe; 60 break; 61 } 62 } 63 spin_unlock_bh(&dev_list_lock); 64 65 return found; 66 } 67 68 struct rxe_dev *get_rxe_by_name(const char *name) 69 { 70 struct rxe_dev *rxe; 71 struct rxe_dev *found = NULL; 72 73 spin_lock_bh(&dev_list_lock); 74 list_for_each_entry(rxe, &rxe_dev_list, list) { 75 if (!strcmp(name, rxe->ib_dev.name)) { 76 found = rxe; 77 break; 78 } 79 } 80 spin_unlock_bh(&dev_list_lock); 81 return found; 82 } 83 84 85 struct rxe_recv_sockets recv_sockets; 86 87 struct device *rxe_dma_device(struct rxe_dev *rxe) 88 { 89 struct net_device *ndev; 90 91 ndev = rxe->ndev; 92 93 if (is_vlan_dev(ndev)) 94 ndev = vlan_dev_real_dev(ndev); 95 96 return ndev->dev.parent; 97 } 98 99 int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid) 100 { 101 int err; 102 unsigned char ll_addr[ETH_ALEN]; 103 104 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); 105 err = dev_mc_add(rxe->ndev, ll_addr); 106 107 return err; 108 } 109 110 int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid) 111 { 112 int err; 113 unsigned char ll_addr[ETH_ALEN]; 114 115 ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); 116 err = dev_mc_del(rxe->ndev, ll_addr); 117 118 return err; 119 } 120 121 static struct dst_entry *rxe_find_route4(struct net_device *ndev, 122 struct in_addr *saddr, 123 struct in_addr *daddr) 124 { 125 struct rtable *rt; 126 struct flowi4 fl = { { 0 } }; 127 128 memset(&fl, 0, sizeof(fl)); 129 fl.flowi4_oif = ndev->ifindex; 130 memcpy(&fl.saddr, saddr, sizeof(*saddr)); 131 memcpy(&fl.daddr, daddr, sizeof(*daddr)); 132 fl.flowi4_proto = IPPROTO_UDP; 133 134 rt = ip_route_output_key(&init_net, &fl); 135 if (IS_ERR(rt)) { 136 pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr); 137 return NULL; 138 } 139 140 return &rt->dst; 141 } 142 143 #if IS_ENABLED(CONFIG_IPV6) 144 static struct dst_entry *rxe_find_route6(struct net_device *ndev, 145 struct in6_addr *saddr, 146 struct in6_addr *daddr) 147 { 148 struct dst_entry *ndst; 149 struct flowi6 fl6 = { { 0 } }; 150 151 memset(&fl6, 0, sizeof(fl6)); 152 fl6.flowi6_oif = ndev->ifindex; 153 memcpy(&fl6.saddr, saddr, sizeof(*saddr)); 154 memcpy(&fl6.daddr, daddr, sizeof(*daddr)); 155 fl6.flowi6_proto = IPPROTO_UDP; 156 157 if (unlikely(ipv6_stub->ipv6_dst_lookup(sock_net(recv_sockets.sk6->sk), 158 recv_sockets.sk6->sk, &ndst, &fl6))) { 159 pr_err_ratelimited("no route to %pI6\n", daddr); 160 goto put; 161 } 162 163 if (unlikely(ndst->error)) { 164 pr_err("no route to %pI6\n", daddr); 165 goto put; 166 } 167 168 return ndst; 169 put: 170 dst_release(ndst); 171 return NULL; 172 } 173 174 #else 175 176 static struct dst_entry *rxe_find_route6(struct net_device *ndev, 177 struct in6_addr *saddr, 178 struct in6_addr *daddr) 179 { 180 return NULL; 181 } 182 183 #endif 184 185 static struct dst_entry *rxe_find_route(struct rxe_dev *rxe, 186 struct rxe_qp *qp, 187 struct rxe_av *av) 188 { 189 struct dst_entry *dst = NULL; 190 191 if (qp_type(qp) == IB_QPT_RC) 192 dst = sk_dst_get(qp->sk->sk); 193 194 if (!dst || !(dst->obsolete && dst->ops->check(dst, 0))) { 195 if (dst) 196 dst_release(dst); 197 198 if (av->network_type == RDMA_NETWORK_IPV4) { 199 struct in_addr *saddr; 200 struct in_addr *daddr; 201 202 saddr = &av->sgid_addr._sockaddr_in.sin_addr; 203 daddr = &av->dgid_addr._sockaddr_in.sin_addr; 204 dst = rxe_find_route4(rxe->ndev, saddr, daddr); 205 } else if (av->network_type == RDMA_NETWORK_IPV6) { 206 struct in6_addr *saddr6; 207 struct in6_addr *daddr6; 208 209 saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr; 210 daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr; 211 dst = rxe_find_route6(rxe->ndev, saddr6, daddr6); 212 } 213 } 214 215 return dst; 216 } 217 218 static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb) 219 { 220 struct udphdr *udph; 221 struct net_device *ndev = skb->dev; 222 struct rxe_dev *rxe = net_to_rxe(ndev); 223 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 224 225 if (!rxe) 226 goto drop; 227 228 if (skb_linearize(skb)) { 229 pr_err("skb_linearize failed\n"); 230 goto drop; 231 } 232 233 udph = udp_hdr(skb); 234 pkt->rxe = rxe; 235 pkt->port_num = 1; 236 pkt->hdr = (u8 *)(udph + 1); 237 pkt->mask = RXE_GRH_MASK; 238 pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph); 239 240 return rxe_rcv(skb); 241 drop: 242 kfree_skb(skb); 243 return 0; 244 } 245 246 static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port, 247 bool ipv6) 248 { 249 int err; 250 struct socket *sock; 251 struct udp_port_cfg udp_cfg = { }; 252 struct udp_tunnel_sock_cfg tnl_cfg = { }; 253 254 if (ipv6) { 255 udp_cfg.family = AF_INET6; 256 udp_cfg.ipv6_v6only = 1; 257 } else { 258 udp_cfg.family = AF_INET; 259 } 260 261 udp_cfg.local_udp_port = port; 262 263 /* Create UDP socket */ 264 err = udp_sock_create(net, &udp_cfg, &sock); 265 if (err < 0) { 266 pr_err("failed to create udp socket. err = %d\n", err); 267 return ERR_PTR(err); 268 } 269 270 tnl_cfg.encap_type = 1; 271 tnl_cfg.encap_rcv = rxe_udp_encap_recv; 272 273 /* Setup UDP tunnel */ 274 setup_udp_tunnel_sock(net, sock, &tnl_cfg); 275 276 return sock; 277 } 278 279 void rxe_release_udp_tunnel(struct socket *sk) 280 { 281 if (sk) 282 udp_tunnel_sock_release(sk); 283 } 284 285 static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port, 286 __be16 dst_port) 287 { 288 struct udphdr *udph; 289 290 __skb_push(skb, sizeof(*udph)); 291 skb_reset_transport_header(skb); 292 udph = udp_hdr(skb); 293 294 udph->dest = dst_port; 295 udph->source = src_port; 296 udph->len = htons(skb->len); 297 udph->check = 0; 298 } 299 300 static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb, 301 __be32 saddr, __be32 daddr, __u8 proto, 302 __u8 tos, __u8 ttl, __be16 df, bool xnet) 303 { 304 struct iphdr *iph; 305 306 skb_scrub_packet(skb, xnet); 307 308 skb_clear_hash(skb); 309 skb_dst_set(skb, dst_clone(dst)); 310 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 311 312 skb_push(skb, sizeof(struct iphdr)); 313 skb_reset_network_header(skb); 314 315 iph = ip_hdr(skb); 316 317 iph->version = IPVERSION; 318 iph->ihl = sizeof(struct iphdr) >> 2; 319 iph->frag_off = df; 320 iph->protocol = proto; 321 iph->tos = tos; 322 iph->daddr = daddr; 323 iph->saddr = saddr; 324 iph->ttl = ttl; 325 __ip_select_ident(dev_net(dst->dev), iph, 326 skb_shinfo(skb)->gso_segs ?: 1); 327 iph->tot_len = htons(skb->len); 328 ip_send_check(iph); 329 } 330 331 static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb, 332 struct in6_addr *saddr, struct in6_addr *daddr, 333 __u8 proto, __u8 prio, __u8 ttl) 334 { 335 struct ipv6hdr *ip6h; 336 337 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 338 IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED 339 | IPSKB_REROUTED); 340 skb_dst_set(skb, dst); 341 342 __skb_push(skb, sizeof(*ip6h)); 343 skb_reset_network_header(skb); 344 ip6h = ipv6_hdr(skb); 345 ip6_flow_hdr(ip6h, prio, htonl(0)); 346 ip6h->payload_len = htons(skb->len); 347 ip6h->nexthdr = proto; 348 ip6h->hop_limit = ttl; 349 ip6h->daddr = *daddr; 350 ip6h->saddr = *saddr; 351 ip6h->payload_len = htons(skb->len - sizeof(*ip6h)); 352 } 353 354 static int prepare4(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, 355 struct sk_buff *skb, struct rxe_av *av) 356 { 357 struct rxe_qp *qp = pkt->qp; 358 struct dst_entry *dst; 359 bool xnet = false; 360 __be16 df = htons(IP_DF); 361 struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr; 362 struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr; 363 364 dst = rxe_find_route(rxe, qp, av); 365 if (!dst) { 366 pr_err("Host not reachable\n"); 367 return -EHOSTUNREACH; 368 } 369 370 if (!memcmp(saddr, daddr, sizeof(*daddr))) 371 pkt->mask |= RXE_LOOPBACK_MASK; 372 373 prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT), 374 htons(ROCE_V2_UDP_DPORT)); 375 376 prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP, 377 av->grh.traffic_class, av->grh.hop_limit, df, xnet); 378 379 if (qp_type(qp) == IB_QPT_RC) 380 sk_dst_set(qp->sk->sk, dst); 381 else 382 dst_release(dst); 383 384 return 0; 385 } 386 387 static int prepare6(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, 388 struct sk_buff *skb, struct rxe_av *av) 389 { 390 struct rxe_qp *qp = pkt->qp; 391 struct dst_entry *dst = NULL; 392 struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr; 393 struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr; 394 395 dst = rxe_find_route(rxe, qp, av); 396 if (!dst) { 397 pr_err("Host not reachable\n"); 398 return -EHOSTUNREACH; 399 } 400 401 if (!memcmp(saddr, daddr, sizeof(*daddr))) 402 pkt->mask |= RXE_LOOPBACK_MASK; 403 404 prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT), 405 htons(ROCE_V2_UDP_DPORT)); 406 407 prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP, 408 av->grh.traffic_class, 409 av->grh.hop_limit); 410 411 if (qp_type(qp) == IB_QPT_RC) 412 sk_dst_set(qp->sk->sk, dst); 413 else 414 dst_release(dst); 415 416 return 0; 417 } 418 419 int rxe_prepare(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, 420 struct sk_buff *skb, u32 *crc) 421 { 422 int err = 0; 423 struct rxe_av *av = rxe_get_av(pkt); 424 425 if (av->network_type == RDMA_NETWORK_IPV4) 426 err = prepare4(rxe, pkt, skb, av); 427 else if (av->network_type == RDMA_NETWORK_IPV6) 428 err = prepare6(rxe, pkt, skb, av); 429 430 *crc = rxe_icrc_hdr(pkt, skb); 431 432 return err; 433 } 434 435 static void rxe_skb_tx_dtor(struct sk_buff *skb) 436 { 437 struct sock *sk = skb->sk; 438 struct rxe_qp *qp = sk->sk_user_data; 439 int skb_out = atomic_dec_return(&qp->skb_out); 440 441 if (unlikely(qp->need_req_skb && 442 skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW)) 443 rxe_run_task(&qp->req.task, 1); 444 } 445 446 int rxe_send(struct rxe_dev *rxe, struct rxe_pkt_info *pkt, struct sk_buff *skb) 447 { 448 struct sk_buff *nskb; 449 struct rxe_av *av; 450 int err; 451 452 av = rxe_get_av(pkt); 453 454 nskb = skb_clone(skb, GFP_ATOMIC); 455 if (!nskb) 456 return -ENOMEM; 457 458 nskb->destructor = rxe_skb_tx_dtor; 459 nskb->sk = pkt->qp->sk->sk; 460 461 if (av->network_type == RDMA_NETWORK_IPV4) { 462 err = ip_local_out(dev_net(skb_dst(skb)->dev), nskb->sk, nskb); 463 } else if (av->network_type == RDMA_NETWORK_IPV6) { 464 err = ip6_local_out(dev_net(skb_dst(skb)->dev), nskb->sk, nskb); 465 } else { 466 pr_err("Unknown layer 3 protocol: %d\n", av->network_type); 467 kfree_skb(nskb); 468 return -EINVAL; 469 } 470 471 if (unlikely(net_xmit_eval(err))) { 472 pr_debug("error sending packet: %d\n", err); 473 return -EAGAIN; 474 } 475 476 atomic_inc(&pkt->qp->skb_out); 477 kfree_skb(skb); 478 479 return 0; 480 } 481 482 int rxe_loopback(struct sk_buff *skb) 483 { 484 return rxe_rcv(skb); 485 } 486 487 static inline int addr_same(struct rxe_dev *rxe, struct rxe_av *av) 488 { 489 return rxe->port.port_guid == av->grh.dgid.global.interface_id; 490 } 491 492 struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av, 493 int paylen, struct rxe_pkt_info *pkt) 494 { 495 unsigned int hdr_len; 496 struct sk_buff *skb; 497 498 if (av->network_type == RDMA_NETWORK_IPV4) 499 hdr_len = ETH_HLEN + sizeof(struct udphdr) + 500 sizeof(struct iphdr); 501 else 502 hdr_len = ETH_HLEN + sizeof(struct udphdr) + 503 sizeof(struct ipv6hdr); 504 505 skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(rxe->ndev), 506 GFP_ATOMIC); 507 if (unlikely(!skb)) 508 return NULL; 509 510 skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(rxe->ndev)); 511 512 skb->dev = rxe->ndev; 513 if (av->network_type == RDMA_NETWORK_IPV4) 514 skb->protocol = htons(ETH_P_IP); 515 else 516 skb->protocol = htons(ETH_P_IPV6); 517 518 pkt->rxe = rxe; 519 pkt->port_num = 1; 520 pkt->hdr = skb_put(skb, paylen); 521 pkt->mask |= RXE_GRH_MASK; 522 523 memset(pkt->hdr, 0, paylen); 524 525 return skb; 526 } 527 528 /* 529 * this is required by rxe_cfg to match rxe devices in 530 * /sys/class/infiniband up with their underlying ethernet devices 531 */ 532 const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num) 533 { 534 return rxe->ndev->name; 535 } 536 537 enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num) 538 { 539 return IB_LINK_LAYER_ETHERNET; 540 } 541 542 struct rxe_dev *rxe_net_add(struct net_device *ndev) 543 { 544 int err; 545 struct rxe_dev *rxe = NULL; 546 547 rxe = (struct rxe_dev *)ib_alloc_device(sizeof(*rxe)); 548 if (!rxe) 549 return NULL; 550 551 rxe->ndev = ndev; 552 553 err = rxe_add(rxe, ndev->mtu); 554 if (err) { 555 ib_dealloc_device(&rxe->ib_dev); 556 return NULL; 557 } 558 559 spin_lock_bh(&dev_list_lock); 560 list_add_tail(&rxe->list, &rxe_dev_list); 561 spin_unlock_bh(&dev_list_lock); 562 return rxe; 563 } 564 565 void rxe_remove_all(void) 566 { 567 spin_lock_bh(&dev_list_lock); 568 while (!list_empty(&rxe_dev_list)) { 569 struct rxe_dev *rxe = 570 list_first_entry(&rxe_dev_list, struct rxe_dev, list); 571 572 list_del(&rxe->list); 573 spin_unlock_bh(&dev_list_lock); 574 rxe_remove(rxe); 575 spin_lock_bh(&dev_list_lock); 576 } 577 spin_unlock_bh(&dev_list_lock); 578 } 579 EXPORT_SYMBOL(rxe_remove_all); 580 581 static void rxe_port_event(struct rxe_dev *rxe, 582 enum ib_event_type event) 583 { 584 struct ib_event ev; 585 586 ev.device = &rxe->ib_dev; 587 ev.element.port_num = 1; 588 ev.event = event; 589 590 ib_dispatch_event(&ev); 591 } 592 593 /* Caller must hold net_info_lock */ 594 void rxe_port_up(struct rxe_dev *rxe) 595 { 596 struct rxe_port *port; 597 598 port = &rxe->port; 599 port->attr.state = IB_PORT_ACTIVE; 600 port->attr.phys_state = IB_PHYS_STATE_LINK_UP; 601 602 rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE); 603 pr_info("set %s active\n", rxe->ib_dev.name); 604 } 605 606 /* Caller must hold net_info_lock */ 607 void rxe_port_down(struct rxe_dev *rxe) 608 { 609 struct rxe_port *port; 610 611 port = &rxe->port; 612 port->attr.state = IB_PORT_DOWN; 613 port->attr.phys_state = IB_PHYS_STATE_LINK_DOWN; 614 615 rxe_port_event(rxe, IB_EVENT_PORT_ERR); 616 pr_info("set %s down\n", rxe->ib_dev.name); 617 } 618 619 static int rxe_notify(struct notifier_block *not_blk, 620 unsigned long event, 621 void *arg) 622 { 623 struct net_device *ndev = netdev_notifier_info_to_dev(arg); 624 struct rxe_dev *rxe = net_to_rxe(ndev); 625 626 if (!rxe) 627 goto out; 628 629 switch (event) { 630 case NETDEV_UNREGISTER: 631 list_del(&rxe->list); 632 rxe_remove(rxe); 633 break; 634 case NETDEV_UP: 635 rxe_port_up(rxe); 636 break; 637 case NETDEV_DOWN: 638 rxe_port_down(rxe); 639 break; 640 case NETDEV_CHANGEMTU: 641 pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu); 642 rxe_set_mtu(rxe, ndev->mtu); 643 break; 644 case NETDEV_REBOOT: 645 case NETDEV_CHANGE: 646 case NETDEV_GOING_DOWN: 647 case NETDEV_CHANGEADDR: 648 case NETDEV_CHANGENAME: 649 case NETDEV_FEAT_CHANGE: 650 default: 651 pr_info("ignoring netdev event = %ld for %s\n", 652 event, ndev->name); 653 break; 654 } 655 out: 656 return NOTIFY_OK; 657 } 658 659 struct notifier_block rxe_net_notifier = { 660 .notifier_call = rxe_notify, 661 }; 662 663 static int rxe_net_ipv4_init(void) 664 { 665 recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net, 666 htons(ROCE_V2_UDP_DPORT), false); 667 if (IS_ERR(recv_sockets.sk4)) { 668 recv_sockets.sk4 = NULL; 669 pr_err("Failed to create IPv4 UDP tunnel\n"); 670 return -1; 671 } 672 673 return 0; 674 } 675 676 static int rxe_net_ipv6_init(void) 677 { 678 #if IS_ENABLED(CONFIG_IPV6) 679 680 recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net, 681 htons(ROCE_V2_UDP_DPORT), true); 682 if (IS_ERR(recv_sockets.sk6)) { 683 recv_sockets.sk6 = NULL; 684 pr_err("Failed to create IPv6 UDP tunnel\n"); 685 return -1; 686 } 687 #endif 688 return 0; 689 } 690 691 void rxe_net_exit(void) 692 { 693 rxe_release_udp_tunnel(recv_sockets.sk6); 694 rxe_release_udp_tunnel(recv_sockets.sk4); 695 unregister_netdevice_notifier(&rxe_net_notifier); 696 } 697 698 int rxe_net_init(void) 699 { 700 int err; 701 702 recv_sockets.sk6 = NULL; 703 704 err = rxe_net_ipv4_init(); 705 if (err) 706 return err; 707 err = rxe_net_ipv6_init(); 708 if (err) 709 goto err_out; 710 err = register_netdevice_notifier(&rxe_net_notifier); 711 if (err) { 712 pr_err("Failed to register netdev notifier\n"); 713 goto err_out; 714 } 715 return 0; 716 err_out: 717 rxe_net_exit(); 718 return err; 719 } 720