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