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 pcpu_sw_netstats *tstats; 99 struct xfrm_state *x; 100 const struct xfrm_mode *inner_mode; 101 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4; 102 u32 orig_mark = skb->mark; 103 int ret; 104 105 if (!tunnel) 106 return 1; 107 108 dev = tunnel->dev; 109 110 if (err) { 111 dev->stats.rx_errors++; 112 dev->stats.rx_dropped++; 113 114 return 0; 115 } 116 117 x = xfrm_input_state(skb); 118 119 inner_mode = &x->inner_mode; 120 121 if (x->sel.family == AF_UNSPEC) { 122 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 123 if (inner_mode == NULL) { 124 XFRM_INC_STATS(dev_net(skb->dev), 125 LINUX_MIB_XFRMINSTATEMODEERROR); 126 return -EINVAL; 127 } 128 } 129 130 family = inner_mode->family; 131 132 skb->mark = be32_to_cpu(tunnel->parms.i_key); 133 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); 134 skb->mark = orig_mark; 135 136 if (!ret) 137 return -EPERM; 138 139 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev))); 140 skb->dev = dev; 141 142 tstats = this_cpu_ptr(dev->tstats); 143 144 u64_stats_update_begin(&tstats->syncp); 145 tstats->rx_packets++; 146 tstats->rx_bytes += skb->len; 147 u64_stats_update_end(&tstats->syncp); 148 149 return 0; 150 } 151 152 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src) 153 { 154 xfrm_address_t *daddr = (xfrm_address_t *)&dst; 155 xfrm_address_t *saddr = (xfrm_address_t *)&src; 156 157 /* if there is no transform then this tunnel is not functional. 158 * Or if the xfrm is not mode tunnel. 159 */ 160 if (!x || x->props.mode != XFRM_MODE_TUNNEL || 161 x->props.family != AF_INET) 162 return false; 163 164 if (!dst) 165 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); 166 167 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) 168 return false; 169 170 return true; 171 } 172 173 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, 174 struct flowi *fl) 175 { 176 struct ip_tunnel *tunnel = netdev_priv(dev); 177 struct ip_tunnel_parm *parms = &tunnel->parms; 178 struct dst_entry *dst = skb_dst(skb); 179 struct net_device *tdev; /* Device to other host */ 180 int pkt_len = skb->len; 181 int err; 182 int mtu; 183 184 if (!dst) { 185 switch (skb->protocol) { 186 case htons(ETH_P_IP): { 187 struct rtable *rt; 188 189 fl->u.ip4.flowi4_oif = dev->ifindex; 190 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; 191 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4); 192 if (IS_ERR(rt)) { 193 dev->stats.tx_carrier_errors++; 194 goto tx_error_icmp; 195 } 196 dst = &rt->dst; 197 skb_dst_set(skb, dst); 198 break; 199 } 200 #if IS_ENABLED(CONFIG_IPV6) 201 case htons(ETH_P_IPV6): 202 fl->u.ip6.flowi6_oif = dev->ifindex; 203 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; 204 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6); 205 if (dst->error) { 206 dst_release(dst); 207 dst = NULL; 208 dev->stats.tx_carrier_errors++; 209 goto tx_error_icmp; 210 } 211 skb_dst_set(skb, dst); 212 break; 213 #endif 214 default: 215 dev->stats.tx_carrier_errors++; 216 goto tx_error_icmp; 217 } 218 } 219 220 dst_hold(dst); 221 dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0); 222 if (IS_ERR(dst)) { 223 dev->stats.tx_carrier_errors++; 224 goto tx_error_icmp; 225 } 226 227 if (dst->flags & DST_XFRM_QUEUE) 228 goto queued; 229 230 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { 231 dev->stats.tx_carrier_errors++; 232 dst_release(dst); 233 goto tx_error_icmp; 234 } 235 236 tdev = dst->dev; 237 238 if (tdev == dev) { 239 dst_release(dst); 240 dev->stats.collisions++; 241 goto tx_error; 242 } 243 244 mtu = dst_mtu(dst); 245 if (skb->len > mtu) { 246 skb_dst_update_pmtu_no_confirm(skb, mtu); 247 if (skb->protocol == htons(ETH_P_IP)) { 248 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 249 htonl(mtu)); 250 } else { 251 if (mtu < IPV6_MIN_MTU) 252 mtu = IPV6_MIN_MTU; 253 254 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 255 } 256 257 dst_release(dst); 258 goto tx_error; 259 } 260 261 queued: 262 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 263 skb_dst_set(skb, dst); 264 skb->dev = skb_dst(skb)->dev; 265 266 err = dst_output(tunnel->net, skb->sk, skb); 267 if (net_xmit_eval(err) == 0) 268 err = pkt_len; 269 iptunnel_xmit_stats(dev, err); 270 return NETDEV_TX_OK; 271 272 tx_error_icmp: 273 dst_link_failure(skb); 274 tx_error: 275 dev->stats.tx_errors++; 276 kfree_skb(skb); 277 return NETDEV_TX_OK; 278 } 279 280 /* This function assumes it is being called from dev_queue_xmit() 281 * and that skb is filled properly by that function. 282 */ 283 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) 284 { 285 struct ip_tunnel *tunnel = netdev_priv(dev); 286 struct flowi fl; 287 288 if (!pskb_inet_may_pull(skb)) 289 goto tx_err; 290 291 memset(&fl, 0, sizeof(fl)); 292 293 switch (skb->protocol) { 294 case htons(ETH_P_IP): 295 xfrm_decode_session(skb, &fl, AF_INET); 296 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 297 break; 298 case htons(ETH_P_IPV6): 299 xfrm_decode_session(skb, &fl, AF_INET6); 300 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 301 break; 302 default: 303 goto tx_err; 304 } 305 306 /* override mark with tunnel output key */ 307 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); 308 309 return vti_xmit(skb, dev, &fl); 310 311 tx_err: 312 dev->stats.tx_errors++; 313 kfree_skb(skb); 314 return NETDEV_TX_OK; 315 } 316 317 static int vti4_err(struct sk_buff *skb, u32 info) 318 { 319 __be32 spi; 320 __u32 mark; 321 struct xfrm_state *x; 322 struct ip_tunnel *tunnel; 323 struct ip_esp_hdr *esph; 324 struct ip_auth_hdr *ah ; 325 struct ip_comp_hdr *ipch; 326 struct net *net = dev_net(skb->dev); 327 const struct iphdr *iph = (const struct iphdr *)skb->data; 328 int protocol = iph->protocol; 329 struct ip_tunnel_net *itn = net_generic(net, vti_net_id); 330 331 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 332 iph->daddr, iph->saddr, 0); 333 if (!tunnel) 334 return -1; 335 336 mark = be32_to_cpu(tunnel->parms.o_key); 337 338 switch (protocol) { 339 case IPPROTO_ESP: 340 esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); 341 spi = esph->spi; 342 break; 343 case IPPROTO_AH: 344 ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); 345 spi = ah->spi; 346 break; 347 case IPPROTO_COMP: 348 ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); 349 spi = htonl(ntohs(ipch->cpi)); 350 break; 351 default: 352 return 0; 353 } 354 355 switch (icmp_hdr(skb)->type) { 356 case ICMP_DEST_UNREACH: 357 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) 358 return 0; 359 case ICMP_REDIRECT: 360 break; 361 default: 362 return 0; 363 } 364 365 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, 366 spi, protocol, AF_INET); 367 if (!x) 368 return 0; 369 370 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 371 ipv4_update_pmtu(skb, net, info, 0, protocol); 372 else 373 ipv4_redirect(skb, net, 0, protocol); 374 xfrm_state_put(x); 375 376 return 0; 377 } 378 379 static int 380 vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 381 { 382 int err = 0; 383 384 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 385 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || 386 p->iph.ihl != 5) 387 return -EINVAL; 388 } 389 390 if (!(p->i_flags & GRE_KEY)) 391 p->i_key = 0; 392 if (!(p->o_flags & GRE_KEY)) 393 p->o_key = 0; 394 395 p->i_flags = VTI_ISVTI; 396 397 err = ip_tunnel_ctl(dev, p, cmd); 398 if (err) 399 return err; 400 401 if (cmd != SIOCDELTUNNEL) { 402 p->i_flags |= GRE_KEY; 403 p->o_flags |= GRE_KEY; 404 } 405 return 0; 406 } 407 408 static const struct net_device_ops vti_netdev_ops = { 409 .ndo_init = vti_tunnel_init, 410 .ndo_uninit = ip_tunnel_uninit, 411 .ndo_start_xmit = vti_tunnel_xmit, 412 .ndo_do_ioctl = ip_tunnel_ioctl, 413 .ndo_change_mtu = ip_tunnel_change_mtu, 414 .ndo_get_stats64 = ip_tunnel_get_stats64, 415 .ndo_get_iflink = ip_tunnel_get_iflink, 416 .ndo_tunnel_ctl = vti_tunnel_ctl, 417 }; 418 419 static void vti_tunnel_setup(struct net_device *dev) 420 { 421 dev->netdev_ops = &vti_netdev_ops; 422 dev->header_ops = &ip_tunnel_header_ops; 423 dev->type = ARPHRD_TUNNEL; 424 ip_tunnel_setup(dev, vti_net_id); 425 } 426 427 static int vti_tunnel_init(struct net_device *dev) 428 { 429 struct ip_tunnel *tunnel = netdev_priv(dev); 430 struct iphdr *iph = &tunnel->parms.iph; 431 432 memcpy(dev->dev_addr, &iph->saddr, 4); 433 memcpy(dev->broadcast, &iph->daddr, 4); 434 435 dev->flags = IFF_NOARP; 436 dev->addr_len = 4; 437 dev->features |= NETIF_F_LLTX; 438 netif_keep_dst(dev); 439 440 return ip_tunnel_init(dev); 441 } 442 443 static void __net_init vti_fb_tunnel_init(struct net_device *dev) 444 { 445 struct ip_tunnel *tunnel = netdev_priv(dev); 446 struct iphdr *iph = &tunnel->parms.iph; 447 448 iph->version = 4; 449 iph->protocol = IPPROTO_IPIP; 450 iph->ihl = 5; 451 } 452 453 static struct xfrm4_protocol vti_esp4_protocol __read_mostly = { 454 .handler = vti_rcv_proto, 455 .input_handler = vti_input_proto, 456 .cb_handler = vti_rcv_cb, 457 .err_handler = vti4_err, 458 .priority = 100, 459 }; 460 461 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = { 462 .handler = vti_rcv_proto, 463 .input_handler = vti_input_proto, 464 .cb_handler = vti_rcv_cb, 465 .err_handler = vti4_err, 466 .priority = 100, 467 }; 468 469 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = { 470 .handler = vti_rcv_proto, 471 .input_handler = vti_input_proto, 472 .cb_handler = vti_rcv_cb, 473 .err_handler = vti4_err, 474 .priority = 100, 475 }; 476 477 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 478 static int vti_rcv_tunnel(struct sk_buff *skb) 479 { 480 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 481 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 482 483 return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false); 484 } 485 486 static struct xfrm_tunnel vti_ipip_handler __read_mostly = { 487 .handler = vti_rcv_tunnel, 488 .cb_handler = vti_rcv_cb, 489 .err_handler = vti4_err, 490 .priority = 0, 491 }; 492 493 static struct xfrm_tunnel vti_ipip6_handler __read_mostly = { 494 .handler = vti_rcv_tunnel, 495 .cb_handler = vti_rcv_cb, 496 .err_handler = vti4_err, 497 .priority = 0, 498 }; 499 #endif 500 501 static int __net_init vti_init_net(struct net *net) 502 { 503 int err; 504 struct ip_tunnel_net *itn; 505 506 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); 507 if (err) 508 return err; 509 itn = net_generic(net, vti_net_id); 510 if (itn->fb_tunnel_dev) 511 vti_fb_tunnel_init(itn->fb_tunnel_dev); 512 return 0; 513 } 514 515 static void __net_exit vti_exit_batch_net(struct list_head *list_net) 516 { 517 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops); 518 } 519 520 static struct pernet_operations vti_net_ops = { 521 .init = vti_init_net, 522 .exit_batch = vti_exit_batch_net, 523 .id = &vti_net_id, 524 .size = sizeof(struct ip_tunnel_net), 525 }; 526 527 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 528 struct netlink_ext_ack *extack) 529 { 530 return 0; 531 } 532 533 static void vti_netlink_parms(struct nlattr *data[], 534 struct ip_tunnel_parm *parms, 535 __u32 *fwmark) 536 { 537 memset(parms, 0, sizeof(*parms)); 538 539 parms->iph.protocol = IPPROTO_IPIP; 540 541 if (!data) 542 return; 543 544 parms->i_flags = VTI_ISVTI; 545 546 if (data[IFLA_VTI_LINK]) 547 parms->link = nla_get_u32(data[IFLA_VTI_LINK]); 548 549 if (data[IFLA_VTI_IKEY]) 550 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); 551 552 if (data[IFLA_VTI_OKEY]) 553 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); 554 555 if (data[IFLA_VTI_LOCAL]) 556 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); 557 558 if (data[IFLA_VTI_REMOTE]) 559 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); 560 561 if (data[IFLA_VTI_FWMARK]) 562 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); 563 } 564 565 static int vti_newlink(struct net *src_net, struct net_device *dev, 566 struct nlattr *tb[], struct nlattr *data[], 567 struct netlink_ext_ack *extack) 568 { 569 struct ip_tunnel_parm parms; 570 __u32 fwmark = 0; 571 572 vti_netlink_parms(data, &parms, &fwmark); 573 return ip_tunnel_newlink(dev, tb, &parms, fwmark); 574 } 575 576 static int vti_changelink(struct net_device *dev, struct nlattr *tb[], 577 struct nlattr *data[], 578 struct netlink_ext_ack *extack) 579 { 580 struct ip_tunnel *t = netdev_priv(dev); 581 __u32 fwmark = t->fwmark; 582 struct ip_tunnel_parm p; 583 584 vti_netlink_parms(data, &p, &fwmark); 585 return ip_tunnel_changelink(dev, tb, &p, fwmark); 586 } 587 588 static size_t vti_get_size(const struct net_device *dev) 589 { 590 return 591 /* IFLA_VTI_LINK */ 592 nla_total_size(4) + 593 /* IFLA_VTI_IKEY */ 594 nla_total_size(4) + 595 /* IFLA_VTI_OKEY */ 596 nla_total_size(4) + 597 /* IFLA_VTI_LOCAL */ 598 nla_total_size(4) + 599 /* IFLA_VTI_REMOTE */ 600 nla_total_size(4) + 601 /* IFLA_VTI_FWMARK */ 602 nla_total_size(4) + 603 0; 604 } 605 606 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) 607 { 608 struct ip_tunnel *t = netdev_priv(dev); 609 struct ip_tunnel_parm *p = &t->parms; 610 611 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || 612 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || 613 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || 614 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || 615 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || 616 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) 617 return -EMSGSIZE; 618 619 return 0; 620 } 621 622 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { 623 [IFLA_VTI_LINK] = { .type = NLA_U32 }, 624 [IFLA_VTI_IKEY] = { .type = NLA_U32 }, 625 [IFLA_VTI_OKEY] = { .type = NLA_U32 }, 626 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 627 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 628 [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, 629 }; 630 631 static struct rtnl_link_ops vti_link_ops __read_mostly = { 632 .kind = "vti", 633 .maxtype = IFLA_VTI_MAX, 634 .policy = vti_policy, 635 .priv_size = sizeof(struct ip_tunnel), 636 .setup = vti_tunnel_setup, 637 .validate = vti_tunnel_validate, 638 .newlink = vti_newlink, 639 .changelink = vti_changelink, 640 .dellink = ip_tunnel_dellink, 641 .get_size = vti_get_size, 642 .fill_info = vti_fill_info, 643 .get_link_net = ip_tunnel_get_link_net, 644 }; 645 646 static int __init vti_init(void) 647 { 648 const char *msg; 649 int err; 650 651 pr_info("IPv4 over IPsec tunneling driver\n"); 652 653 msg = "tunnel device"; 654 err = register_pernet_device(&vti_net_ops); 655 if (err < 0) 656 goto pernet_dev_failed; 657 658 msg = "tunnel protocols"; 659 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); 660 if (err < 0) 661 goto xfrm_proto_esp_failed; 662 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); 663 if (err < 0) 664 goto xfrm_proto_ah_failed; 665 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); 666 if (err < 0) 667 goto xfrm_proto_comp_failed; 668 669 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 670 msg = "ipip tunnel"; 671 err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET); 672 if (err < 0) 673 goto xfrm_tunnel_ipip_failed; 674 #if IS_ENABLED(CONFIG_IPV6) 675 err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6); 676 if (err < 0) 677 goto xfrm_tunnel_ipip6_failed; 678 #endif 679 #endif 680 681 msg = "netlink interface"; 682 err = rtnl_link_register(&vti_link_ops); 683 if (err < 0) 684 goto rtnl_link_failed; 685 686 return err; 687 688 rtnl_link_failed: 689 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 690 #if IS_ENABLED(CONFIG_IPV6) 691 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 692 xfrm_tunnel_ipip6_failed: 693 #endif 694 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 695 xfrm_tunnel_ipip_failed: 696 #endif 697 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 698 xfrm_proto_comp_failed: 699 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 700 xfrm_proto_ah_failed: 701 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 702 xfrm_proto_esp_failed: 703 unregister_pernet_device(&vti_net_ops); 704 pernet_dev_failed: 705 pr_err("vti init: failed to register %s\n", msg); 706 return err; 707 } 708 709 static void __exit vti_fini(void) 710 { 711 rtnl_link_unregister(&vti_link_ops); 712 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 713 #if IS_ENABLED(CONFIG_IPV6) 714 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 715 #endif 716 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 717 #endif 718 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 719 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 720 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 721 unregister_pernet_device(&vti_net_ops); 722 } 723 724 module_init(vti_init); 725 module_exit(vti_fini); 726 MODULE_LICENSE("GPL"); 727 MODULE_ALIAS_RTNL_LINK("vti"); 728 MODULE_ALIAS_NETDEV("ip_vti0"); 729