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_cb(struct sk_buff *skb, int err) 95 { 96 unsigned short family; 97 struct net_device *dev; 98 struct xfrm_state *x; 99 const struct xfrm_mode *inner_mode; 100 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4; 101 u32 orig_mark = skb->mark; 102 int ret; 103 104 if (!tunnel) 105 return 1; 106 107 dev = tunnel->dev; 108 109 if (err) { 110 dev->stats.rx_errors++; 111 dev->stats.rx_dropped++; 112 113 return 0; 114 } 115 116 x = xfrm_input_state(skb); 117 118 inner_mode = &x->inner_mode; 119 120 if (x->sel.family == AF_UNSPEC) { 121 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 122 if (inner_mode == NULL) { 123 XFRM_INC_STATS(dev_net(skb->dev), 124 LINUX_MIB_XFRMINSTATEMODEERROR); 125 return -EINVAL; 126 } 127 } 128 129 family = inner_mode->family; 130 131 skb->mark = be32_to_cpu(tunnel->parms.i_key); 132 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); 133 skb->mark = orig_mark; 134 135 if (!ret) 136 return -EPERM; 137 138 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev))); 139 skb->dev = dev; 140 dev_sw_netstats_rx_add(dev, skb->len); 141 142 return 0; 143 } 144 145 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src) 146 { 147 xfrm_address_t *daddr = (xfrm_address_t *)&dst; 148 xfrm_address_t *saddr = (xfrm_address_t *)&src; 149 150 /* if there is no transform then this tunnel is not functional. 151 * Or if the xfrm is not mode tunnel. 152 */ 153 if (!x || x->props.mode != XFRM_MODE_TUNNEL || 154 x->props.family != AF_INET) 155 return false; 156 157 if (!dst) 158 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); 159 160 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) 161 return false; 162 163 return true; 164 } 165 166 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, 167 struct flowi *fl) 168 { 169 struct ip_tunnel *tunnel = netdev_priv(dev); 170 struct ip_tunnel_parm *parms = &tunnel->parms; 171 struct dst_entry *dst = skb_dst(skb); 172 struct net_device *tdev; /* Device to other host */ 173 int pkt_len = skb->len; 174 int err; 175 int mtu; 176 177 if (!dst) { 178 switch (skb->protocol) { 179 case htons(ETH_P_IP): { 180 struct rtable *rt; 181 182 fl->u.ip4.flowi4_oif = dev->ifindex; 183 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; 184 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4); 185 if (IS_ERR(rt)) { 186 dev->stats.tx_carrier_errors++; 187 goto tx_error_icmp; 188 } 189 dst = &rt->dst; 190 skb_dst_set(skb, dst); 191 break; 192 } 193 #if IS_ENABLED(CONFIG_IPV6) 194 case htons(ETH_P_IPV6): 195 fl->u.ip6.flowi6_oif = dev->ifindex; 196 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; 197 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6); 198 if (dst->error) { 199 dst_release(dst); 200 dst = NULL; 201 dev->stats.tx_carrier_errors++; 202 goto tx_error_icmp; 203 } 204 skb_dst_set(skb, dst); 205 break; 206 #endif 207 default: 208 dev->stats.tx_carrier_errors++; 209 goto tx_error_icmp; 210 } 211 } 212 213 dst_hold(dst); 214 dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0); 215 if (IS_ERR(dst)) { 216 dev->stats.tx_carrier_errors++; 217 goto tx_error_icmp; 218 } 219 220 if (dst->flags & DST_XFRM_QUEUE) 221 goto queued; 222 223 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { 224 dev->stats.tx_carrier_errors++; 225 dst_release(dst); 226 goto tx_error_icmp; 227 } 228 229 tdev = dst->dev; 230 231 if (tdev == dev) { 232 dst_release(dst); 233 dev->stats.collisions++; 234 goto tx_error; 235 } 236 237 mtu = dst_mtu(dst); 238 if (skb->len > mtu) { 239 skb_dst_update_pmtu_no_confirm(skb, mtu); 240 if (skb->protocol == htons(ETH_P_IP)) { 241 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 242 htonl(mtu)); 243 } else { 244 if (mtu < IPV6_MIN_MTU) 245 mtu = IPV6_MIN_MTU; 246 247 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 248 } 249 250 dst_release(dst); 251 goto tx_error; 252 } 253 254 queued: 255 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 256 skb_dst_set(skb, dst); 257 skb->dev = skb_dst(skb)->dev; 258 259 err = dst_output(tunnel->net, skb->sk, skb); 260 if (net_xmit_eval(err) == 0) 261 err = pkt_len; 262 iptunnel_xmit_stats(dev, err); 263 return NETDEV_TX_OK; 264 265 tx_error_icmp: 266 dst_link_failure(skb); 267 tx_error: 268 dev->stats.tx_errors++; 269 kfree_skb(skb); 270 return NETDEV_TX_OK; 271 } 272 273 /* This function assumes it is being called from dev_queue_xmit() 274 * and that skb is filled properly by that function. 275 */ 276 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) 277 { 278 struct ip_tunnel *tunnel = netdev_priv(dev); 279 struct flowi fl; 280 281 if (!pskb_inet_may_pull(skb)) 282 goto tx_err; 283 284 memset(&fl, 0, sizeof(fl)); 285 286 switch (skb->protocol) { 287 case htons(ETH_P_IP): 288 xfrm_decode_session(skb, &fl, AF_INET); 289 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 290 break; 291 case htons(ETH_P_IPV6): 292 xfrm_decode_session(skb, &fl, AF_INET6); 293 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 294 break; 295 default: 296 goto tx_err; 297 } 298 299 /* override mark with tunnel output key */ 300 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); 301 302 return vti_xmit(skb, dev, &fl); 303 304 tx_err: 305 dev->stats.tx_errors++; 306 kfree_skb(skb); 307 return NETDEV_TX_OK; 308 } 309 310 static int vti4_err(struct sk_buff *skb, u32 info) 311 { 312 __be32 spi; 313 __u32 mark; 314 struct xfrm_state *x; 315 struct ip_tunnel *tunnel; 316 struct ip_esp_hdr *esph; 317 struct ip_auth_hdr *ah ; 318 struct ip_comp_hdr *ipch; 319 struct net *net = dev_net(skb->dev); 320 const struct iphdr *iph = (const struct iphdr *)skb->data; 321 int protocol = iph->protocol; 322 struct ip_tunnel_net *itn = net_generic(net, vti_net_id); 323 324 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 325 iph->daddr, iph->saddr, 0); 326 if (!tunnel) 327 return -1; 328 329 mark = be32_to_cpu(tunnel->parms.o_key); 330 331 switch (protocol) { 332 case IPPROTO_ESP: 333 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); 334 spi = esph->spi; 335 break; 336 case IPPROTO_AH: 337 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 338 spi = ah->spi; 339 break; 340 case IPPROTO_COMP: 341 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); 342 spi = htonl(ntohs(ipch->cpi)); 343 break; 344 default: 345 return 0; 346 } 347 348 switch (icmp_hdr(skb)->type) { 349 case ICMP_DEST_UNREACH: 350 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 351 return 0; 352 case ICMP_REDIRECT: 353 break; 354 default: 355 return 0; 356 } 357 358 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, 359 spi, protocol, AF_INET); 360 if (!x) 361 return 0; 362 363 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 364 ipv4_update_pmtu(skb, net, info, 0, protocol); 365 else 366 ipv4_redirect(skb, net, 0, protocol); 367 xfrm_state_put(x); 368 369 return 0; 370 } 371 372 static int 373 vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 374 { 375 int err = 0; 376 377 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 378 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || 379 p->iph.ihl != 5) 380 return -EINVAL; 381 } 382 383 if (!(p->i_flags & GRE_KEY)) 384 p->i_key = 0; 385 if (!(p->o_flags & GRE_KEY)) 386 p->o_key = 0; 387 388 p->i_flags = VTI_ISVTI; 389 390 err = ip_tunnel_ctl(dev, p, cmd); 391 if (err) 392 return err; 393 394 if (cmd != SIOCDELTUNNEL) { 395 p->i_flags |= GRE_KEY; 396 p->o_flags |= GRE_KEY; 397 } 398 return 0; 399 } 400 401 static const struct net_device_ops vti_netdev_ops = { 402 .ndo_init = vti_tunnel_init, 403 .ndo_uninit = ip_tunnel_uninit, 404 .ndo_start_xmit = vti_tunnel_xmit, 405 .ndo_do_ioctl = ip_tunnel_ioctl, 406 .ndo_change_mtu = ip_tunnel_change_mtu, 407 .ndo_get_stats64 = dev_get_tstats64, 408 .ndo_get_iflink = ip_tunnel_get_iflink, 409 .ndo_tunnel_ctl = vti_tunnel_ctl, 410 }; 411 412 static void vti_tunnel_setup(struct net_device *dev) 413 { 414 dev->netdev_ops = &vti_netdev_ops; 415 dev->header_ops = &ip_tunnel_header_ops; 416 dev->type = ARPHRD_TUNNEL; 417 ip_tunnel_setup(dev, vti_net_id); 418 } 419 420 static int vti_tunnel_init(struct net_device *dev) 421 { 422 struct ip_tunnel *tunnel = netdev_priv(dev); 423 struct iphdr *iph = &tunnel->parms.iph; 424 425 memcpy(dev->dev_addr, &iph->saddr, 4); 426 memcpy(dev->broadcast, &iph->daddr, 4); 427 428 dev->flags = IFF_NOARP; 429 dev->addr_len = 4; 430 dev->features |= NETIF_F_LLTX; 431 netif_keep_dst(dev); 432 433 return ip_tunnel_init(dev); 434 } 435 436 static void __net_init vti_fb_tunnel_init(struct net_device *dev) 437 { 438 struct ip_tunnel *tunnel = netdev_priv(dev); 439 struct iphdr *iph = &tunnel->parms.iph; 440 441 iph->version = 4; 442 iph->protocol = IPPROTO_IPIP; 443 iph->ihl = 5; 444 } 445 446 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = { 447 .handler = vti_rcv_proto, 448 .input_handler = vti_input_proto, 449 .cb_handler = vti_rcv_cb, 450 .err_handler = vti4_err, 451 .priority = 100, 452 }; 453 454 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = { 455 .handler = vti_rcv_proto, 456 .input_handler = vti_input_proto, 457 .cb_handler = vti_rcv_cb, 458 .err_handler = vti4_err, 459 .priority = 100, 460 }; 461 462 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = { 463 .handler = vti_rcv_proto, 464 .input_handler = vti_input_proto, 465 .cb_handler = vti_rcv_cb, 466 .err_handler = vti4_err, 467 .priority = 100, 468 }; 469 470 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 471 static int vti_rcv_tunnel(struct sk_buff *skb) 472 { 473 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 474 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 475 476 return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false); 477 } 478 479 static struct xfrm_tunnel vti_ipip_handler __read_mostly = { 480 .handler = vti_rcv_tunnel, 481 .cb_handler = vti_rcv_cb, 482 .err_handler = vti4_err, 483 .priority = 0, 484 }; 485 486 #if IS_ENABLED(CONFIG_IPV6) 487 static struct xfrm_tunnel vti_ipip6_handler __read_mostly = { 488 .handler = vti_rcv_tunnel, 489 .cb_handler = vti_rcv_cb, 490 .err_handler = vti4_err, 491 .priority = 0, 492 }; 493 #endif 494 #endif 495 496 static int __net_init vti_init_net(struct net *net) 497 { 498 int err; 499 struct ip_tunnel_net *itn; 500 501 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); 502 if (err) 503 return err; 504 itn = net_generic(net, vti_net_id); 505 if (itn->fb_tunnel_dev) 506 vti_fb_tunnel_init(itn->fb_tunnel_dev); 507 return 0; 508 } 509 510 static void __net_exit vti_exit_batch_net(struct list_head *list_net) 511 { 512 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops); 513 } 514 515 static struct pernet_operations vti_net_ops = { 516 .init = vti_init_net, 517 .exit_batch = vti_exit_batch_net, 518 .id = &vti_net_id, 519 .size = sizeof(struct ip_tunnel_net), 520 }; 521 522 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 523 struct netlink_ext_ack *extack) 524 { 525 return 0; 526 } 527 528 static void vti_netlink_parms(struct nlattr *data[], 529 struct ip_tunnel_parm *parms, 530 __u32 *fwmark) 531 { 532 memset(parms, 0, sizeof(*parms)); 533 534 parms->iph.protocol = IPPROTO_IPIP; 535 536 if (!data) 537 return; 538 539 parms->i_flags = VTI_ISVTI; 540 541 if (data[IFLA_VTI_LINK]) 542 parms->link = nla_get_u32(data[IFLA_VTI_LINK]); 543 544 if (data[IFLA_VTI_IKEY]) 545 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); 546 547 if (data[IFLA_VTI_OKEY]) 548 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); 549 550 if (data[IFLA_VTI_LOCAL]) 551 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); 552 553 if (data[IFLA_VTI_REMOTE]) 554 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); 555 556 if (data[IFLA_VTI_FWMARK]) 557 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); 558 } 559 560 static int vti_newlink(struct net *src_net, struct net_device *dev, 561 struct nlattr *tb[], struct nlattr *data[], 562 struct netlink_ext_ack *extack) 563 { 564 struct ip_tunnel_parm parms; 565 __u32 fwmark = 0; 566 567 vti_netlink_parms(data, &parms, &fwmark); 568 return ip_tunnel_newlink(dev, tb, &parms, fwmark); 569 } 570 571 static int vti_changelink(struct net_device *dev, struct nlattr *tb[], 572 struct nlattr *data[], 573 struct netlink_ext_ack *extack) 574 { 575 struct ip_tunnel *t = netdev_priv(dev); 576 __u32 fwmark = t->fwmark; 577 struct ip_tunnel_parm p; 578 579 vti_netlink_parms(data, &p, &fwmark); 580 return ip_tunnel_changelink(dev, tb, &p, fwmark); 581 } 582 583 static size_t vti_get_size(const struct net_device *dev) 584 { 585 return 586 /* IFLA_VTI_LINK */ 587 nla_total_size(4) + 588 /* IFLA_VTI_IKEY */ 589 nla_total_size(4) + 590 /* IFLA_VTI_OKEY */ 591 nla_total_size(4) + 592 /* IFLA_VTI_LOCAL */ 593 nla_total_size(4) + 594 /* IFLA_VTI_REMOTE */ 595 nla_total_size(4) + 596 /* IFLA_VTI_FWMARK */ 597 nla_total_size(4) + 598 0; 599 } 600 601 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) 602 { 603 struct ip_tunnel *t = netdev_priv(dev); 604 struct ip_tunnel_parm *p = &t->parms; 605 606 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || 607 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || 608 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || 609 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || 610 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || 611 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) 612 return -EMSGSIZE; 613 614 return 0; 615 } 616 617 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { 618 [IFLA_VTI_LINK] = { .type = NLA_U32 }, 619 [IFLA_VTI_IKEY] = { .type = NLA_U32 }, 620 [IFLA_VTI_OKEY] = { .type = NLA_U32 }, 621 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 622 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 623 [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, 624 }; 625 626 static struct rtnl_link_ops vti_link_ops __read_mostly = { 627 .kind = "vti", 628 .maxtype = IFLA_VTI_MAX, 629 .policy = vti_policy, 630 .priv_size = sizeof(struct ip_tunnel), 631 .setup = vti_tunnel_setup, 632 .validate = vti_tunnel_validate, 633 .newlink = vti_newlink, 634 .changelink = vti_changelink, 635 .dellink = ip_tunnel_dellink, 636 .get_size = vti_get_size, 637 .fill_info = vti_fill_info, 638 .get_link_net = ip_tunnel_get_link_net, 639 }; 640 641 static int __init vti_init(void) 642 { 643 const char *msg; 644 int err; 645 646 pr_info("IPv4 over IPsec tunneling driver\n"); 647 648 msg = "tunnel device"; 649 err = register_pernet_device(&vti_net_ops); 650 if (err < 0) 651 goto pernet_dev_failed; 652 653 msg = "tunnel protocols"; 654 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); 655 if (err < 0) 656 goto xfrm_proto_esp_failed; 657 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); 658 if (err < 0) 659 goto xfrm_proto_ah_failed; 660 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); 661 if (err < 0) 662 goto xfrm_proto_comp_failed; 663 664 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 665 msg = "ipip tunnel"; 666 err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET); 667 if (err < 0) 668 goto xfrm_tunnel_ipip_failed; 669 #if IS_ENABLED(CONFIG_IPV6) 670 err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6); 671 if (err < 0) 672 goto xfrm_tunnel_ipip6_failed; 673 #endif 674 #endif 675 676 msg = "netlink interface"; 677 err = rtnl_link_register(&vti_link_ops); 678 if (err < 0) 679 goto rtnl_link_failed; 680 681 return err; 682 683 rtnl_link_failed: 684 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 685 #if IS_ENABLED(CONFIG_IPV6) 686 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 687 xfrm_tunnel_ipip6_failed: 688 #endif 689 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 690 xfrm_tunnel_ipip_failed: 691 #endif 692 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 693 xfrm_proto_comp_failed: 694 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 695 xfrm_proto_ah_failed: 696 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 697 xfrm_proto_esp_failed: 698 unregister_pernet_device(&vti_net_ops); 699 pernet_dev_failed: 700 pr_err("vti init: failed to register %s\n", msg); 701 return err; 702 } 703 704 static void __exit vti_fini(void) 705 { 706 rtnl_link_unregister(&vti_link_ops); 707 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 708 #if IS_ENABLED(CONFIG_IPV6) 709 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 710 #endif 711 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 712 #endif 713 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 714 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 715 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 716 unregister_pernet_device(&vti_net_ops); 717 } 718 719 module_init(vti_init); 720 module_exit(vti_fini); 721 MODULE_LICENSE("GPL"); 722 MODULE_ALIAS_RTNL_LINK("vti"); 723 MODULE_ALIAS_NETDEV("ip_vti0"); 724