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