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 xmit; 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 if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) 242 goto xmit; 243 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 244 htonl(mtu)); 245 } else { 246 if (mtu < IPV6_MIN_MTU) 247 mtu = IPV6_MIN_MTU; 248 249 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 250 } 251 252 dst_release(dst); 253 goto tx_error; 254 } 255 256 xmit: 257 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 258 skb_dst_set(skb, dst); 259 skb->dev = skb_dst(skb)->dev; 260 261 err = dst_output(tunnel->net, skb->sk, skb); 262 if (net_xmit_eval(err) == 0) 263 err = pkt_len; 264 iptunnel_xmit_stats(dev, err); 265 return NETDEV_TX_OK; 266 267 tx_error_icmp: 268 dst_link_failure(skb); 269 tx_error: 270 dev->stats.tx_errors++; 271 kfree_skb(skb); 272 return NETDEV_TX_OK; 273 } 274 275 /* This function assumes it is being called from dev_queue_xmit() 276 * and that skb is filled properly by that function. 277 */ 278 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) 279 { 280 struct ip_tunnel *tunnel = netdev_priv(dev); 281 struct flowi fl; 282 283 if (!pskb_inet_may_pull(skb)) 284 goto tx_err; 285 286 memset(&fl, 0, sizeof(fl)); 287 288 switch (skb->protocol) { 289 case htons(ETH_P_IP): 290 xfrm_decode_session(skb, &fl, AF_INET); 291 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 292 break; 293 case htons(ETH_P_IPV6): 294 xfrm_decode_session(skb, &fl, AF_INET6); 295 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 296 break; 297 default: 298 goto tx_err; 299 } 300 301 /* override mark with tunnel output key */ 302 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); 303 304 return vti_xmit(skb, dev, &fl); 305 306 tx_err: 307 dev->stats.tx_errors++; 308 kfree_skb(skb); 309 return NETDEV_TX_OK; 310 } 311 312 static int vti4_err(struct sk_buff *skb, u32 info) 313 { 314 __be32 spi; 315 __u32 mark; 316 struct xfrm_state *x; 317 struct ip_tunnel *tunnel; 318 struct ip_esp_hdr *esph; 319 struct ip_auth_hdr *ah ; 320 struct ip_comp_hdr *ipch; 321 struct net *net = dev_net(skb->dev); 322 const struct iphdr *iph = (const struct iphdr *)skb->data; 323 int protocol = iph->protocol; 324 struct ip_tunnel_net *itn = net_generic(net, vti_net_id); 325 326 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 327 iph->daddr, iph->saddr, 0); 328 if (!tunnel) 329 return -1; 330 331 mark = be32_to_cpu(tunnel->parms.o_key); 332 333 switch (protocol) { 334 case IPPROTO_ESP: 335 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); 336 spi = esph->spi; 337 break; 338 case IPPROTO_AH: 339 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 340 spi = ah->spi; 341 break; 342 case IPPROTO_COMP: 343 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); 344 spi = htonl(ntohs(ipch->cpi)); 345 break; 346 default: 347 return 0; 348 } 349 350 switch (icmp_hdr(skb)->type) { 351 case ICMP_DEST_UNREACH: 352 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 353 return 0; 354 break; 355 case ICMP_REDIRECT: 356 break; 357 default: 358 return 0; 359 } 360 361 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, 362 spi, protocol, AF_INET); 363 if (!x) 364 return 0; 365 366 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 367 ipv4_update_pmtu(skb, net, info, 0, protocol); 368 else 369 ipv4_redirect(skb, net, 0, protocol); 370 xfrm_state_put(x); 371 372 return 0; 373 } 374 375 static int 376 vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 377 { 378 int err = 0; 379 380 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 381 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || 382 p->iph.ihl != 5) 383 return -EINVAL; 384 } 385 386 if (!(p->i_flags & GRE_KEY)) 387 p->i_key = 0; 388 if (!(p->o_flags & GRE_KEY)) 389 p->o_key = 0; 390 391 p->i_flags = VTI_ISVTI; 392 393 err = ip_tunnel_ctl(dev, p, cmd); 394 if (err) 395 return err; 396 397 if (cmd != SIOCDELTUNNEL) { 398 p->i_flags |= GRE_KEY; 399 p->o_flags |= GRE_KEY; 400 } 401 return 0; 402 } 403 404 static const struct net_device_ops vti_netdev_ops = { 405 .ndo_init = vti_tunnel_init, 406 .ndo_uninit = ip_tunnel_uninit, 407 .ndo_start_xmit = vti_tunnel_xmit, 408 .ndo_do_ioctl = ip_tunnel_ioctl, 409 .ndo_change_mtu = ip_tunnel_change_mtu, 410 .ndo_get_stats64 = dev_get_tstats64, 411 .ndo_get_iflink = ip_tunnel_get_iflink, 412 .ndo_tunnel_ctl = vti_tunnel_ctl, 413 }; 414 415 static void vti_tunnel_setup(struct net_device *dev) 416 { 417 dev->netdev_ops = &vti_netdev_ops; 418 dev->header_ops = &ip_tunnel_header_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_proto, 451 .input_handler = vti_input_proto, 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_proto, 459 .input_handler = vti_input_proto, 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_proto, 467 .input_handler = vti_input_proto, 468 .cb_handler = vti_rcv_cb, 469 .err_handler = vti4_err, 470 .priority = 100, 471 }; 472 473 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 474 static int vti_rcv_tunnel(struct sk_buff *skb) 475 { 476 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 477 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 478 479 return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false); 480 } 481 482 static struct xfrm_tunnel vti_ipip_handler __read_mostly = { 483 .handler = vti_rcv_tunnel, 484 .cb_handler = vti_rcv_cb, 485 .err_handler = vti4_err, 486 .priority = 0, 487 }; 488 489 #if IS_ENABLED(CONFIG_IPV6) 490 static struct xfrm_tunnel vti_ipip6_handler __read_mostly = { 491 .handler = vti_rcv_tunnel, 492 .cb_handler = vti_rcv_cb, 493 .err_handler = vti4_err, 494 .priority = 0, 495 }; 496 #endif 497 #endif 498 499 static int __net_init vti_init_net(struct net *net) 500 { 501 int err; 502 struct ip_tunnel_net *itn; 503 504 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); 505 if (err) 506 return err; 507 itn = net_generic(net, vti_net_id); 508 if (itn->fb_tunnel_dev) 509 vti_fb_tunnel_init(itn->fb_tunnel_dev); 510 return 0; 511 } 512 513 static void __net_exit vti_exit_batch_net(struct list_head *list_net) 514 { 515 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops); 516 } 517 518 static struct pernet_operations vti_net_ops = { 519 .init = vti_init_net, 520 .exit_batch = vti_exit_batch_net, 521 .id = &vti_net_id, 522 .size = sizeof(struct ip_tunnel_net), 523 }; 524 525 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 526 struct netlink_ext_ack *extack) 527 { 528 return 0; 529 } 530 531 static void vti_netlink_parms(struct nlattr *data[], 532 struct ip_tunnel_parm *parms, 533 __u32 *fwmark) 534 { 535 memset(parms, 0, sizeof(*parms)); 536 537 parms->iph.protocol = IPPROTO_IPIP; 538 539 if (!data) 540 return; 541 542 parms->i_flags = VTI_ISVTI; 543 544 if (data[IFLA_VTI_LINK]) 545 parms->link = nla_get_u32(data[IFLA_VTI_LINK]); 546 547 if (data[IFLA_VTI_IKEY]) 548 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); 549 550 if (data[IFLA_VTI_OKEY]) 551 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); 552 553 if (data[IFLA_VTI_LOCAL]) 554 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); 555 556 if (data[IFLA_VTI_REMOTE]) 557 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); 558 559 if (data[IFLA_VTI_FWMARK]) 560 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); 561 } 562 563 static int vti_newlink(struct net *src_net, struct net_device *dev, 564 struct nlattr *tb[], struct nlattr *data[], 565 struct netlink_ext_ack *extack) 566 { 567 struct ip_tunnel_parm parms; 568 __u32 fwmark = 0; 569 570 vti_netlink_parms(data, &parms, &fwmark); 571 return ip_tunnel_newlink(dev, tb, &parms, fwmark); 572 } 573 574 static int vti_changelink(struct net_device *dev, struct nlattr *tb[], 575 struct nlattr *data[], 576 struct netlink_ext_ack *extack) 577 { 578 struct ip_tunnel *t = netdev_priv(dev); 579 __u32 fwmark = t->fwmark; 580 struct ip_tunnel_parm p; 581 582 vti_netlink_parms(data, &p, &fwmark); 583 return ip_tunnel_changelink(dev, tb, &p, fwmark); 584 } 585 586 static size_t vti_get_size(const struct net_device *dev) 587 { 588 return 589 /* IFLA_VTI_LINK */ 590 nla_total_size(4) + 591 /* IFLA_VTI_IKEY */ 592 nla_total_size(4) + 593 /* IFLA_VTI_OKEY */ 594 nla_total_size(4) + 595 /* IFLA_VTI_LOCAL */ 596 nla_total_size(4) + 597 /* IFLA_VTI_REMOTE */ 598 nla_total_size(4) + 599 /* IFLA_VTI_FWMARK */ 600 nla_total_size(4) + 601 0; 602 } 603 604 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) 605 { 606 struct ip_tunnel *t = netdev_priv(dev); 607 struct ip_tunnel_parm *p = &t->parms; 608 609 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || 610 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || 611 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || 612 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || 613 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || 614 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) 615 return -EMSGSIZE; 616 617 return 0; 618 } 619 620 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { 621 [IFLA_VTI_LINK] = { .type = NLA_U32 }, 622 [IFLA_VTI_IKEY] = { .type = NLA_U32 }, 623 [IFLA_VTI_OKEY] = { .type = NLA_U32 }, 624 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 625 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 626 [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, 627 }; 628 629 static struct rtnl_link_ops vti_link_ops __read_mostly = { 630 .kind = "vti", 631 .maxtype = IFLA_VTI_MAX, 632 .policy = vti_policy, 633 .priv_size = sizeof(struct ip_tunnel), 634 .setup = vti_tunnel_setup, 635 .validate = vti_tunnel_validate, 636 .newlink = vti_newlink, 637 .changelink = vti_changelink, 638 .dellink = ip_tunnel_dellink, 639 .get_size = vti_get_size, 640 .fill_info = vti_fill_info, 641 .get_link_net = ip_tunnel_get_link_net, 642 }; 643 644 static int __init vti_init(void) 645 { 646 const char *msg; 647 int err; 648 649 pr_info("IPv4 over IPsec tunneling driver\n"); 650 651 msg = "tunnel device"; 652 err = register_pernet_device(&vti_net_ops); 653 if (err < 0) 654 goto pernet_dev_failed; 655 656 msg = "tunnel protocols"; 657 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); 658 if (err < 0) 659 goto xfrm_proto_esp_failed; 660 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); 661 if (err < 0) 662 goto xfrm_proto_ah_failed; 663 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); 664 if (err < 0) 665 goto xfrm_proto_comp_failed; 666 667 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 668 msg = "ipip tunnel"; 669 err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET); 670 if (err < 0) 671 goto xfrm_tunnel_ipip_failed; 672 #if IS_ENABLED(CONFIG_IPV6) 673 err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6); 674 if (err < 0) 675 goto xfrm_tunnel_ipip6_failed; 676 #endif 677 #endif 678 679 msg = "netlink interface"; 680 err = rtnl_link_register(&vti_link_ops); 681 if (err < 0) 682 goto rtnl_link_failed; 683 684 return err; 685 686 rtnl_link_failed: 687 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 688 #if IS_ENABLED(CONFIG_IPV6) 689 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 690 xfrm_tunnel_ipip6_failed: 691 #endif 692 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 693 xfrm_tunnel_ipip_failed: 694 #endif 695 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 696 xfrm_proto_comp_failed: 697 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 698 xfrm_proto_ah_failed: 699 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 700 xfrm_proto_esp_failed: 701 unregister_pernet_device(&vti_net_ops); 702 pernet_dev_failed: 703 pr_err("vti init: failed to register %s\n", msg); 704 return err; 705 } 706 707 static void __exit vti_fini(void) 708 { 709 rtnl_link_unregister(&vti_link_ops); 710 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 711 #if IS_ENABLED(CONFIG_IPV6) 712 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 713 #endif 714 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 715 #endif 716 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 717 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 718 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 719 unregister_pernet_device(&vti_net_ops); 720 } 721 722 module_init(vti_init); 723 module_exit(vti_fini); 724 MODULE_LICENSE("GPL"); 725 MODULE_ALIAS_RTNL_LINK("vti"); 726 MODULE_ALIAS_NETDEV("ip_vti0"); 727