1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux NET3: IP/IP protocol decoder modified to support 4 * virtual tunnel interface 5 * 6 * Authors: 7 * Saurabh Mohan (saurabh.mohan@vyatta.com) 05/07/2012 8 */ 9 10 /* 11 This version of net/ipv4/ip_vti.c is cloned of net/ipv4/ipip.c 12 13 For comments look at net/ipv4/ip_gre.c --ANK 14 */ 15 16 17 #include <linux/capability.h> 18 #include <linux/module.h> 19 #include <linux/types.h> 20 #include <linux/kernel.h> 21 #include <linux/uaccess.h> 22 #include <linux/skbuff.h> 23 #include <linux/netdevice.h> 24 #include <linux/in.h> 25 #include <linux/tcp.h> 26 #include <linux/udp.h> 27 #include <linux/if_arp.h> 28 #include <linux/init.h> 29 #include <linux/netfilter_ipv4.h> 30 #include <linux/if_ether.h> 31 #include <linux/icmpv6.h> 32 33 #include <net/sock.h> 34 #include <net/ip.h> 35 #include <net/icmp.h> 36 #include <net/ip_tunnels.h> 37 #include <net/inet_ecn.h> 38 #include <net/xfrm.h> 39 #include <net/net_namespace.h> 40 #include <net/netns/generic.h> 41 42 static struct rtnl_link_ops vti_link_ops __read_mostly; 43 44 static unsigned int vti_net_id __read_mostly; 45 static int vti_tunnel_init(struct net_device *dev); 46 47 static int vti_input(struct sk_buff *skb, int nexthdr, __be32 spi, 48 int encap_type, bool update_skb_dev) 49 { 50 struct ip_tunnel *tunnel; 51 const struct iphdr *iph = ip_hdr(skb); 52 struct net *net = dev_net(skb->dev); 53 struct ip_tunnel_net *itn = net_generic(net, vti_net_id); 54 55 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 56 iph->saddr, iph->daddr, 0); 57 if (tunnel) { 58 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 59 goto drop; 60 61 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel; 62 63 if (update_skb_dev) 64 skb->dev = tunnel->dev; 65 66 return xfrm_input(skb, nexthdr, spi, encap_type); 67 } 68 69 return -EINVAL; 70 drop: 71 kfree_skb(skb); 72 return 0; 73 } 74 75 static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi, 76 int encap_type) 77 { 78 return vti_input(skb, nexthdr, spi, encap_type, false); 79 } 80 81 static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev) 82 { 83 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 84 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 85 86 return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev); 87 } 88 89 static int vti_rcv_proto(struct sk_buff *skb) 90 { 91 return vti_rcv(skb, 0, false); 92 } 93 94 static int vti_rcv_tunnel(struct sk_buff *skb) 95 { 96 struct ip_tunnel_net *itn = net_generic(dev_net(skb->dev), vti_net_id); 97 const struct iphdr *iph = ip_hdr(skb); 98 struct ip_tunnel *tunnel; 99 100 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 101 iph->saddr, iph->daddr, 0); 102 if (tunnel) { 103 struct tnl_ptk_info tpi = { 104 .proto = htons(ETH_P_IP), 105 }; 106 107 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 108 goto drop; 109 if (iptunnel_pull_header(skb, 0, tpi.proto, false)) 110 goto drop; 111 return ip_tunnel_rcv(tunnel, skb, &tpi, NULL, false); 112 } 113 114 return -EINVAL; 115 drop: 116 kfree_skb(skb); 117 return 0; 118 } 119 120 static int vti_rcv_cb(struct sk_buff *skb, int err) 121 { 122 unsigned short family; 123 struct net_device *dev; 124 struct pcpu_sw_netstats *tstats; 125 struct xfrm_state *x; 126 const struct xfrm_mode *inner_mode; 127 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4; 128 u32 orig_mark = skb->mark; 129 int ret; 130 131 if (!tunnel) 132 return 1; 133 134 dev = tunnel->dev; 135 136 if (err) { 137 dev->stats.rx_errors++; 138 dev->stats.rx_dropped++; 139 140 return 0; 141 } 142 143 x = xfrm_input_state(skb); 144 145 inner_mode = &x->inner_mode; 146 147 if (x->sel.family == AF_UNSPEC) { 148 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 149 if (inner_mode == NULL) { 150 XFRM_INC_STATS(dev_net(skb->dev), 151 LINUX_MIB_XFRMINSTATEMODEERROR); 152 return -EINVAL; 153 } 154 } 155 156 family = inner_mode->family; 157 158 skb->mark = be32_to_cpu(tunnel->parms.i_key); 159 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); 160 skb->mark = orig_mark; 161 162 if (!ret) 163 return -EPERM; 164 165 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev))); 166 skb->dev = dev; 167 168 tstats = this_cpu_ptr(dev->tstats); 169 170 u64_stats_update_begin(&tstats->syncp); 171 tstats->rx_packets++; 172 tstats->rx_bytes += skb->len; 173 u64_stats_update_end(&tstats->syncp); 174 175 return 0; 176 } 177 178 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src) 179 { 180 xfrm_address_t *daddr = (xfrm_address_t *)&dst; 181 xfrm_address_t *saddr = (xfrm_address_t *)&src; 182 183 /* if there is no transform then this tunnel is not functional. 184 * Or if the xfrm is not mode tunnel. 185 */ 186 if (!x || x->props.mode != XFRM_MODE_TUNNEL || 187 x->props.family != AF_INET) 188 return false; 189 190 if (!dst) 191 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); 192 193 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) 194 return false; 195 196 return true; 197 } 198 199 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, 200 struct flowi *fl) 201 { 202 struct ip_tunnel *tunnel = netdev_priv(dev); 203 struct ip_tunnel_parm *parms = &tunnel->parms; 204 struct dst_entry *dst = skb_dst(skb); 205 struct net_device *tdev; /* Device to other host */ 206 int pkt_len = skb->len; 207 int err; 208 int mtu; 209 210 if (!dst) { 211 switch (skb->protocol) { 212 case htons(ETH_P_IP): { 213 struct rtable *rt; 214 215 fl->u.ip4.flowi4_oif = dev->ifindex; 216 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; 217 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4); 218 if (IS_ERR(rt)) { 219 dev->stats.tx_carrier_errors++; 220 goto tx_error_icmp; 221 } 222 dst = &rt->dst; 223 skb_dst_set(skb, dst); 224 break; 225 } 226 #if IS_ENABLED(CONFIG_IPV6) 227 case htons(ETH_P_IPV6): 228 fl->u.ip6.flowi6_oif = dev->ifindex; 229 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; 230 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6); 231 if (dst->error) { 232 dst_release(dst); 233 dst = NULL; 234 dev->stats.tx_carrier_errors++; 235 goto tx_error_icmp; 236 } 237 skb_dst_set(skb, dst); 238 break; 239 #endif 240 default: 241 dev->stats.tx_carrier_errors++; 242 goto tx_error_icmp; 243 } 244 } 245 246 dst_hold(dst); 247 dst = xfrm_lookup(tunnel->net, dst, fl, NULL, 0); 248 if (IS_ERR(dst)) { 249 dev->stats.tx_carrier_errors++; 250 goto tx_error_icmp; 251 } 252 253 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { 254 dev->stats.tx_carrier_errors++; 255 dst_release(dst); 256 goto tx_error_icmp; 257 } 258 259 tdev = dst->dev; 260 261 if (tdev == dev) { 262 dst_release(dst); 263 dev->stats.collisions++; 264 goto tx_error; 265 } 266 267 mtu = dst_mtu(dst); 268 if (skb->len > mtu) { 269 skb_dst_update_pmtu_no_confirm(skb, mtu); 270 if (skb->protocol == htons(ETH_P_IP)) { 271 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 272 htonl(mtu)); 273 } else { 274 if (mtu < IPV6_MIN_MTU) 275 mtu = IPV6_MIN_MTU; 276 277 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 278 } 279 280 dst_release(dst); 281 goto tx_error; 282 } 283 284 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 285 skb_dst_set(skb, dst); 286 skb->dev = skb_dst(skb)->dev; 287 288 err = dst_output(tunnel->net, skb->sk, skb); 289 if (net_xmit_eval(err) == 0) 290 err = pkt_len; 291 iptunnel_xmit_stats(dev, err); 292 return NETDEV_TX_OK; 293 294 tx_error_icmp: 295 dst_link_failure(skb); 296 tx_error: 297 dev->stats.tx_errors++; 298 kfree_skb(skb); 299 return NETDEV_TX_OK; 300 } 301 302 /* This function assumes it is being called from dev_queue_xmit() 303 * and that skb is filled properly by that function. 304 */ 305 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) 306 { 307 struct ip_tunnel *tunnel = netdev_priv(dev); 308 struct flowi fl; 309 310 if (!pskb_inet_may_pull(skb)) 311 goto tx_err; 312 313 memset(&fl, 0, sizeof(fl)); 314 315 switch (skb->protocol) { 316 case htons(ETH_P_IP): 317 xfrm_decode_session(skb, &fl, AF_INET); 318 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 319 break; 320 case htons(ETH_P_IPV6): 321 xfrm_decode_session(skb, &fl, AF_INET6); 322 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 323 break; 324 default: 325 goto tx_err; 326 } 327 328 /* override mark with tunnel output key */ 329 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); 330 331 return vti_xmit(skb, dev, &fl); 332 333 tx_err: 334 dev->stats.tx_errors++; 335 kfree_skb(skb); 336 return NETDEV_TX_OK; 337 } 338 339 static int vti4_err(struct sk_buff *skb, u32 info) 340 { 341 __be32 spi; 342 __u32 mark; 343 struct xfrm_state *x; 344 struct ip_tunnel *tunnel; 345 struct ip_esp_hdr *esph; 346 struct ip_auth_hdr *ah ; 347 struct ip_comp_hdr *ipch; 348 struct net *net = dev_net(skb->dev); 349 const struct iphdr *iph = (const struct iphdr *)skb->data; 350 int protocol = iph->protocol; 351 struct ip_tunnel_net *itn = net_generic(net, vti_net_id); 352 353 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 354 iph->daddr, iph->saddr, 0); 355 if (!tunnel) 356 return -1; 357 358 mark = be32_to_cpu(tunnel->parms.o_key); 359 360 switch (protocol) { 361 case IPPROTO_ESP: 362 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); 363 spi = esph->spi; 364 break; 365 case IPPROTO_AH: 366 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 367 spi = ah->spi; 368 break; 369 case IPPROTO_COMP: 370 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); 371 spi = htonl(ntohs(ipch->cpi)); 372 break; 373 default: 374 return 0; 375 } 376 377 switch (icmp_hdr(skb)->type) { 378 case ICMP_DEST_UNREACH: 379 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 380 return 0; 381 case ICMP_REDIRECT: 382 break; 383 default: 384 return 0; 385 } 386 387 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, 388 spi, protocol, AF_INET); 389 if (!x) 390 return 0; 391 392 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 393 ipv4_update_pmtu(skb, net, info, 0, protocol); 394 else 395 ipv4_redirect(skb, net, 0, protocol); 396 xfrm_state_put(x); 397 398 return 0; 399 } 400 401 static int 402 vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 403 { 404 int err = 0; 405 406 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 407 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || 408 p->iph.ihl != 5) 409 return -EINVAL; 410 } 411 412 if (!(p->i_flags & GRE_KEY)) 413 p->i_key = 0; 414 if (!(p->o_flags & GRE_KEY)) 415 p->o_key = 0; 416 417 p->i_flags = VTI_ISVTI; 418 419 err = ip_tunnel_ctl(dev, p, cmd); 420 if (err) 421 return err; 422 423 if (cmd != SIOCDELTUNNEL) { 424 p->i_flags |= GRE_KEY; 425 p->o_flags |= GRE_KEY; 426 } 427 return 0; 428 } 429 430 static const struct net_device_ops vti_netdev_ops = { 431 .ndo_init = vti_tunnel_init, 432 .ndo_uninit = ip_tunnel_uninit, 433 .ndo_start_xmit = vti_tunnel_xmit, 434 .ndo_do_ioctl = ip_tunnel_ioctl, 435 .ndo_change_mtu = ip_tunnel_change_mtu, 436 .ndo_get_stats64 = ip_tunnel_get_stats64, 437 .ndo_get_iflink = ip_tunnel_get_iflink, 438 .ndo_tunnel_ctl = vti_tunnel_ctl, 439 }; 440 441 static void vti_tunnel_setup(struct net_device *dev) 442 { 443 dev->netdev_ops = &vti_netdev_ops; 444 dev->type = ARPHRD_TUNNEL; 445 ip_tunnel_setup(dev, vti_net_id); 446 } 447 448 static int vti_tunnel_init(struct net_device *dev) 449 { 450 struct ip_tunnel *tunnel = netdev_priv(dev); 451 struct iphdr *iph = &tunnel->parms.iph; 452 453 memcpy(dev->dev_addr, &iph->saddr, 4); 454 memcpy(dev->broadcast, &iph->daddr, 4); 455 456 dev->flags = IFF_NOARP; 457 dev->addr_len = 4; 458 dev->features |= NETIF_F_LLTX; 459 netif_keep_dst(dev); 460 461 return ip_tunnel_init(dev); 462 } 463 464 static void __net_init vti_fb_tunnel_init(struct net_device *dev) 465 { 466 struct ip_tunnel *tunnel = netdev_priv(dev); 467 struct iphdr *iph = &tunnel->parms.iph; 468 469 iph->version = 4; 470 iph->protocol = IPPROTO_IPIP; 471 iph->ihl = 5; 472 } 473 474 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = { 475 .handler = vti_rcv_proto, 476 .input_handler = vti_input_proto, 477 .cb_handler = vti_rcv_cb, 478 .err_handler = vti4_err, 479 .priority = 100, 480 }; 481 482 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = { 483 .handler = vti_rcv_proto, 484 .input_handler = vti_input_proto, 485 .cb_handler = vti_rcv_cb, 486 .err_handler = vti4_err, 487 .priority = 100, 488 }; 489 490 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = { 491 .handler = vti_rcv_proto, 492 .input_handler = vti_input_proto, 493 .cb_handler = vti_rcv_cb, 494 .err_handler = vti4_err, 495 .priority = 100, 496 }; 497 498 static struct xfrm_tunnel ipip_handler __read_mostly = { 499 .handler = vti_rcv_tunnel, 500 .err_handler = vti4_err, 501 .priority = 0, 502 }; 503 504 static int __net_init vti_init_net(struct net *net) 505 { 506 int err; 507 struct ip_tunnel_net *itn; 508 509 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); 510 if (err) 511 return err; 512 itn = net_generic(net, vti_net_id); 513 if (itn->fb_tunnel_dev) 514 vti_fb_tunnel_init(itn->fb_tunnel_dev); 515 return 0; 516 } 517 518 static void __net_exit vti_exit_batch_net(struct list_head *list_net) 519 { 520 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops); 521 } 522 523 static struct pernet_operations vti_net_ops = { 524 .init = vti_init_net, 525 .exit_batch = vti_exit_batch_net, 526 .id = &vti_net_id, 527 .size = sizeof(struct ip_tunnel_net), 528 }; 529 530 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 531 struct netlink_ext_ack *extack) 532 { 533 return 0; 534 } 535 536 static void vti_netlink_parms(struct nlattr *data[], 537 struct ip_tunnel_parm *parms, 538 __u32 *fwmark) 539 { 540 memset(parms, 0, sizeof(*parms)); 541 542 parms->iph.protocol = IPPROTO_IPIP; 543 544 if (!data) 545 return; 546 547 parms->i_flags = VTI_ISVTI; 548 549 if (data[IFLA_VTI_LINK]) 550 parms->link = nla_get_u32(data[IFLA_VTI_LINK]); 551 552 if (data[IFLA_VTI_IKEY]) 553 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); 554 555 if (data[IFLA_VTI_OKEY]) 556 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); 557 558 if (data[IFLA_VTI_LOCAL]) 559 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); 560 561 if (data[IFLA_VTI_REMOTE]) 562 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); 563 564 if (data[IFLA_VTI_FWMARK]) 565 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); 566 } 567 568 static int vti_newlink(struct net *src_net, struct net_device *dev, 569 struct nlattr *tb[], struct nlattr *data[], 570 struct netlink_ext_ack *extack) 571 { 572 struct ip_tunnel_parm parms; 573 __u32 fwmark = 0; 574 575 vti_netlink_parms(data, &parms, &fwmark); 576 return ip_tunnel_newlink(dev, tb, &parms, fwmark); 577 } 578 579 static int vti_changelink(struct net_device *dev, struct nlattr *tb[], 580 struct nlattr *data[], 581 struct netlink_ext_ack *extack) 582 { 583 struct ip_tunnel *t = netdev_priv(dev); 584 __u32 fwmark = t->fwmark; 585 struct ip_tunnel_parm p; 586 587 vti_netlink_parms(data, &p, &fwmark); 588 return ip_tunnel_changelink(dev, tb, &p, fwmark); 589 } 590 591 static size_t vti_get_size(const struct net_device *dev) 592 { 593 return 594 /* IFLA_VTI_LINK */ 595 nla_total_size(4) + 596 /* IFLA_VTI_IKEY */ 597 nla_total_size(4) + 598 /* IFLA_VTI_OKEY */ 599 nla_total_size(4) + 600 /* IFLA_VTI_LOCAL */ 601 nla_total_size(4) + 602 /* IFLA_VTI_REMOTE */ 603 nla_total_size(4) + 604 /* IFLA_VTI_FWMARK */ 605 nla_total_size(4) + 606 0; 607 } 608 609 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) 610 { 611 struct ip_tunnel *t = netdev_priv(dev); 612 struct ip_tunnel_parm *p = &t->parms; 613 614 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || 615 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || 616 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || 617 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || 618 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || 619 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) 620 return -EMSGSIZE; 621 622 return 0; 623 } 624 625 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { 626 [IFLA_VTI_LINK] = { .type = NLA_U32 }, 627 [IFLA_VTI_IKEY] = { .type = NLA_U32 }, 628 [IFLA_VTI_OKEY] = { .type = NLA_U32 }, 629 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 630 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 631 [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, 632 }; 633 634 static struct rtnl_link_ops vti_link_ops __read_mostly = { 635 .kind = "vti", 636 .maxtype = IFLA_VTI_MAX, 637 .policy = vti_policy, 638 .priv_size = sizeof(struct ip_tunnel), 639 .setup = vti_tunnel_setup, 640 .validate = vti_tunnel_validate, 641 .newlink = vti_newlink, 642 .changelink = vti_changelink, 643 .dellink = ip_tunnel_dellink, 644 .get_size = vti_get_size, 645 .fill_info = vti_fill_info, 646 .get_link_net = ip_tunnel_get_link_net, 647 }; 648 649 static int __init vti_init(void) 650 { 651 const char *msg; 652 int err; 653 654 pr_info("IPv4 over IPsec tunneling driver\n"); 655 656 msg = "tunnel device"; 657 err = register_pernet_device(&vti_net_ops); 658 if (err < 0) 659 goto pernet_dev_failed; 660 661 msg = "tunnel protocols"; 662 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); 663 if (err < 0) 664 goto xfrm_proto_esp_failed; 665 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); 666 if (err < 0) 667 goto xfrm_proto_ah_failed; 668 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); 669 if (err < 0) 670 goto xfrm_proto_comp_failed; 671 672 msg = "ipip tunnel"; 673 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 674 if (err < 0) 675 goto xfrm_tunnel_failed; 676 677 msg = "netlink interface"; 678 err = rtnl_link_register(&vti_link_ops); 679 if (err < 0) 680 goto rtnl_link_failed; 681 682 return err; 683 684 rtnl_link_failed: 685 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 686 xfrm_tunnel_failed: 687 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 688 xfrm_proto_comp_failed: 689 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 690 xfrm_proto_ah_failed: 691 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 692 xfrm_proto_esp_failed: 693 unregister_pernet_device(&vti_net_ops); 694 pernet_dev_failed: 695 pr_err("vti init: failed to register %s\n", msg); 696 return err; 697 } 698 699 static void __exit vti_fini(void) 700 { 701 rtnl_link_unregister(&vti_link_ops); 702 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 703 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 704 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 705 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 706 unregister_pernet_device(&vti_net_ops); 707 } 708 709 module_init(vti_init); 710 module_exit(vti_fini); 711 MODULE_LICENSE("GPL"); 712 MODULE_ALIAS_RTNL_LINK("vti"); 713 MODULE_ALIAS_NETDEV("ip_vti0"); 714