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 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 55 56 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags); 57 58 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, 59 iph->saddr, iph->daddr, 0); 60 if (tunnel) { 61 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 62 goto drop; 63 64 XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = tunnel; 65 66 if (update_skb_dev) 67 skb->dev = tunnel->dev; 68 69 return xfrm_input(skb, nexthdr, spi, encap_type); 70 } 71 72 return -EINVAL; 73 drop: 74 kfree_skb(skb); 75 return 0; 76 } 77 78 static int vti_input_proto(struct sk_buff *skb, int nexthdr, __be32 spi, 79 int encap_type) 80 { 81 return vti_input(skb, nexthdr, spi, encap_type, false); 82 } 83 84 static int vti_rcv(struct sk_buff *skb, __be32 spi, bool update_skb_dev) 85 { 86 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 87 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 88 89 return vti_input(skb, ip_hdr(skb)->protocol, spi, 0, update_skb_dev); 90 } 91 92 static int vti_rcv_proto(struct sk_buff *skb) 93 { 94 return vti_rcv(skb, 0, false); 95 } 96 97 static int vti_rcv_cb(struct sk_buff *skb, int err) 98 { 99 unsigned short family; 100 struct net_device *dev; 101 struct xfrm_state *x; 102 const struct xfrm_mode *inner_mode; 103 struct ip_tunnel *tunnel = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4; 104 u32 orig_mark = skb->mark; 105 int ret; 106 107 if (!tunnel) 108 return 1; 109 110 dev = tunnel->dev; 111 112 if (err) { 113 DEV_STATS_INC(dev, rx_errors); 114 DEV_STATS_INC(dev, rx_dropped); 115 116 return 0; 117 } 118 119 x = xfrm_input_state(skb); 120 121 inner_mode = &x->inner_mode; 122 123 if (x->sel.family == AF_UNSPEC) { 124 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); 125 if (inner_mode == NULL) { 126 XFRM_INC_STATS(dev_net(skb->dev), 127 LINUX_MIB_XFRMINSTATEMODEERROR); 128 return -EINVAL; 129 } 130 } 131 132 family = inner_mode->family; 133 134 skb->mark = be32_to_cpu(tunnel->parms.i_key); 135 ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family); 136 skb->mark = orig_mark; 137 138 if (!ret) 139 return -EPERM; 140 141 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(skb->dev))); 142 skb->dev = dev; 143 dev_sw_netstats_rx_add(dev, skb->len); 144 145 return 0; 146 } 147 148 static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src) 149 { 150 xfrm_address_t *daddr = (xfrm_address_t *)&dst; 151 xfrm_address_t *saddr = (xfrm_address_t *)&src; 152 153 /* if there is no transform then this tunnel is not functional. 154 * Or if the xfrm is not mode tunnel. 155 */ 156 if (!x || x->props.mode != XFRM_MODE_TUNNEL || 157 x->props.family != AF_INET) 158 return false; 159 160 if (!dst) 161 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); 162 163 if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) 164 return false; 165 166 return true; 167 } 168 169 static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, 170 struct flowi *fl) 171 { 172 struct ip_tunnel *tunnel = netdev_priv(dev); 173 struct ip_tunnel_parm_kern *parms = &tunnel->parms; 174 struct dst_entry *dst = skb_dst(skb); 175 struct net_device *tdev; /* Device to other host */ 176 int pkt_len = skb->len; 177 int err; 178 int mtu; 179 180 if (!dst) { 181 switch (skb->protocol) { 182 case htons(ETH_P_IP): { 183 struct rtable *rt; 184 185 fl->u.ip4.flowi4_oif = dev->ifindex; 186 fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC; 187 rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4); 188 if (IS_ERR(rt)) { 189 DEV_STATS_INC(dev, tx_carrier_errors); 190 goto tx_error_icmp; 191 } 192 dst = &rt->dst; 193 skb_dst_set(skb, dst); 194 break; 195 } 196 #if IS_ENABLED(CONFIG_IPV6) 197 case htons(ETH_P_IPV6): 198 fl->u.ip6.flowi6_oif = dev->ifindex; 199 fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC; 200 dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6); 201 if (dst->error) { 202 dst_release(dst); 203 dst = NULL; 204 DEV_STATS_INC(dev, tx_carrier_errors); 205 goto tx_error_icmp; 206 } 207 skb_dst_set(skb, dst); 208 break; 209 #endif 210 default: 211 DEV_STATS_INC(dev, tx_carrier_errors); 212 goto tx_error_icmp; 213 } 214 } 215 216 dst_hold(dst); 217 dst = xfrm_lookup_route(tunnel->net, dst, fl, NULL, 0); 218 if (IS_ERR(dst)) { 219 DEV_STATS_INC(dev, tx_carrier_errors); 220 goto tx_error_icmp; 221 } 222 223 if (dst->flags & DST_XFRM_QUEUE) 224 goto xmit; 225 226 if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { 227 DEV_STATS_INC(dev, tx_carrier_errors); 228 dst_release(dst); 229 goto tx_error_icmp; 230 } 231 232 tdev = dst->dev; 233 234 if (tdev == dev) { 235 dst_release(dst); 236 DEV_STATS_INC(dev, collisions); 237 goto tx_error; 238 } 239 240 mtu = dst_mtu(dst); 241 if (skb->len > mtu) { 242 skb_dst_update_pmtu_no_confirm(skb, mtu); 243 if (skb->protocol == htons(ETH_P_IP)) { 244 if (!(ip_hdr(skb)->frag_off & htons(IP_DF))) 245 goto xmit; 246 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 247 htonl(mtu)); 248 } else { 249 if (mtu < IPV6_MIN_MTU) 250 mtu = IPV6_MIN_MTU; 251 252 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 253 } 254 255 dst_release(dst); 256 goto tx_error; 257 } 258 259 xmit: 260 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); 261 skb_dst_set(skb, dst); 262 skb->dev = skb_dst(skb)->dev; 263 264 err = dst_output(tunnel->net, skb->sk, skb); 265 if (net_xmit_eval(err) == 0) 266 err = pkt_len; 267 iptunnel_xmit_stats(dev, err); 268 return NETDEV_TX_OK; 269 270 tx_error_icmp: 271 dst_link_failure(skb); 272 tx_error: 273 DEV_STATS_INC(dev, tx_errors); 274 kfree_skb(skb); 275 return NETDEV_TX_OK; 276 } 277 278 /* This function assumes it is being called from dev_queue_xmit() 279 * and that skb is filled properly by that function. 280 */ 281 static netdev_tx_t vti_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) 282 { 283 struct ip_tunnel *tunnel = netdev_priv(dev); 284 struct flowi fl; 285 286 if (!pskb_inet_may_pull(skb)) 287 goto tx_err; 288 289 memset(&fl, 0, sizeof(fl)); 290 291 switch (skb->protocol) { 292 case htons(ETH_P_IP): 293 memset(IPCB(skb), 0, sizeof(*IPCB(skb))); 294 xfrm_decode_session(dev_net(dev), skb, &fl, AF_INET); 295 break; 296 case htons(ETH_P_IPV6): 297 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); 298 xfrm_decode_session(dev_net(dev), skb, &fl, AF_INET6); 299 break; 300 default: 301 goto tx_err; 302 } 303 304 /* override mark with tunnel output key */ 305 fl.flowi_mark = be32_to_cpu(tunnel->parms.o_key); 306 307 return vti_xmit(skb, dev, &fl); 308 309 tx_err: 310 DEV_STATS_INC(dev, tx_errors); 311 kfree_skb(skb); 312 return NETDEV_TX_OK; 313 } 314 315 static int vti4_err(struct sk_buff *skb, u32 info) 316 { 317 __be32 spi; 318 __u32 mark; 319 struct xfrm_state *x; 320 struct ip_tunnel *tunnel; 321 struct ip_esp_hdr *esph; 322 struct ip_auth_hdr *ah ; 323 struct ip_comp_hdr *ipch; 324 struct net *net = dev_net(skb->dev); 325 const struct iphdr *iph = (const struct iphdr *)skb->data; 326 int protocol = iph->protocol; 327 struct ip_tunnel_net *itn = net_generic(net, vti_net_id); 328 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 329 330 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags); 331 332 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, 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 break; 361 case ICMP_REDIRECT: 362 break; 363 default: 364 return 0; 365 } 366 367 x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr, 368 spi, protocol, AF_INET); 369 if (!x) 370 return 0; 371 372 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) 373 ipv4_update_pmtu(skb, net, info, 0, protocol); 374 else 375 ipv4_redirect(skb, net, 0, protocol); 376 xfrm_state_put(x); 377 378 return 0; 379 } 380 381 static int 382 vti_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, int cmd) 383 { 384 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 385 int err = 0; 386 387 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 388 if (p->iph.version != 4 || p->iph.protocol != IPPROTO_IPIP || 389 p->iph.ihl != 5) 390 return -EINVAL; 391 } 392 393 if (!ip_tunnel_flags_is_be16_compat(p->i_flags) || 394 !ip_tunnel_flags_is_be16_compat(p->o_flags)) 395 return -EOVERFLOW; 396 397 if (!(ip_tunnel_flags_to_be16(p->i_flags) & GRE_KEY)) 398 p->i_key = 0; 399 if (!(ip_tunnel_flags_to_be16(p->o_flags) & GRE_KEY)) 400 p->o_key = 0; 401 402 __set_bit(IP_TUNNEL_VTI_BIT, flags); 403 ip_tunnel_flags_copy(p->i_flags, flags); 404 405 err = ip_tunnel_ctl(dev, p, cmd); 406 if (err) 407 return err; 408 409 if (cmd != SIOCDELTUNNEL) { 410 ip_tunnel_flags_from_be16(flags, GRE_KEY); 411 ip_tunnel_flags_or(p->i_flags, p->i_flags, flags); 412 ip_tunnel_flags_or(p->o_flags, p->o_flags, flags); 413 } 414 return 0; 415 } 416 417 static const struct net_device_ops vti_netdev_ops = { 418 .ndo_init = vti_tunnel_init, 419 .ndo_uninit = ip_tunnel_uninit, 420 .ndo_start_xmit = vti_tunnel_xmit, 421 .ndo_siocdevprivate = ip_tunnel_siocdevprivate, 422 .ndo_change_mtu = ip_tunnel_change_mtu, 423 .ndo_get_stats64 = dev_get_tstats64, 424 .ndo_get_iflink = ip_tunnel_get_iflink, 425 .ndo_tunnel_ctl = vti_tunnel_ctl, 426 }; 427 428 static void vti_tunnel_setup(struct net_device *dev) 429 { 430 dev->netdev_ops = &vti_netdev_ops; 431 dev->header_ops = &ip_tunnel_header_ops; 432 dev->type = ARPHRD_TUNNEL; 433 ip_tunnel_setup(dev, vti_net_id); 434 } 435 436 static int vti_tunnel_init(struct net_device *dev) 437 { 438 struct ip_tunnel *tunnel = netdev_priv(dev); 439 struct iphdr *iph = &tunnel->parms.iph; 440 441 __dev_addr_set(dev, &iph->saddr, 4); 442 memcpy(dev->broadcast, &iph->daddr, 4); 443 444 dev->flags = IFF_NOARP; 445 dev->addr_len = 4; 446 dev->lltx = true; 447 netif_keep_dst(dev); 448 449 return ip_tunnel_init(dev); 450 } 451 452 static void __net_init vti_fb_tunnel_init(struct net_device *dev) 453 { 454 struct ip_tunnel *tunnel = netdev_priv(dev); 455 struct iphdr *iph = &tunnel->parms.iph; 456 457 iph->version = 4; 458 iph->protocol = IPPROTO_IPIP; 459 iph->ihl = 5; 460 } 461 462 static struct xfrm4_protocol vti_esp4_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 static struct xfrm4_protocol vti_ah4_protocol __read_mostly = { 471 .handler = vti_rcv_proto, 472 .input_handler = vti_input_proto, 473 .cb_handler = vti_rcv_cb, 474 .err_handler = vti4_err, 475 .priority = 100, 476 }; 477 478 static struct xfrm4_protocol vti_ipcomp4_protocol __read_mostly = { 479 .handler = vti_rcv_proto, 480 .input_handler = vti_input_proto, 481 .cb_handler = vti_rcv_cb, 482 .err_handler = vti4_err, 483 .priority = 100, 484 }; 485 486 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 487 static int vti_rcv_tunnel(struct sk_buff *skb) 488 { 489 XFRM_SPI_SKB_CB(skb)->family = AF_INET; 490 XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr); 491 492 return vti_input(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr, 0, false); 493 } 494 495 static struct xfrm_tunnel vti_ipip_handler __read_mostly = { 496 .handler = vti_rcv_tunnel, 497 .cb_handler = vti_rcv_cb, 498 .err_handler = vti4_err, 499 .priority = 0, 500 }; 501 502 #if IS_ENABLED(CONFIG_IPV6) 503 static struct xfrm_tunnel vti_ipip6_handler __read_mostly = { 504 .handler = vti_rcv_tunnel, 505 .cb_handler = vti_rcv_cb, 506 .err_handler = vti4_err, 507 .priority = 0, 508 }; 509 #endif 510 #endif 511 512 static int __net_init vti_init_net(struct net *net) 513 { 514 int err; 515 struct ip_tunnel_net *itn; 516 517 err = ip_tunnel_init_net(net, vti_net_id, &vti_link_ops, "ip_vti0"); 518 if (err) 519 return err; 520 itn = net_generic(net, vti_net_id); 521 if (itn->fb_tunnel_dev) 522 vti_fb_tunnel_init(itn->fb_tunnel_dev); 523 return 0; 524 } 525 526 static void __net_exit vti_exit_batch_rtnl(struct list_head *list_net, 527 struct list_head *dev_to_kill) 528 { 529 ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops, 530 dev_to_kill); 531 } 532 533 static struct pernet_operations vti_net_ops = { 534 .init = vti_init_net, 535 .exit_batch_rtnl = vti_exit_batch_rtnl, 536 .id = &vti_net_id, 537 .size = sizeof(struct ip_tunnel_net), 538 }; 539 540 static int vti_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 541 struct netlink_ext_ack *extack) 542 { 543 return 0; 544 } 545 546 static void vti_netlink_parms(struct nlattr *data[], 547 struct ip_tunnel_parm_kern *parms, 548 __u32 *fwmark) 549 { 550 memset(parms, 0, sizeof(*parms)); 551 552 parms->iph.protocol = IPPROTO_IPIP; 553 554 if (!data) 555 return; 556 557 __set_bit(IP_TUNNEL_VTI_BIT, parms->i_flags); 558 559 if (data[IFLA_VTI_LINK]) 560 parms->link = nla_get_u32(data[IFLA_VTI_LINK]); 561 562 if (data[IFLA_VTI_IKEY]) 563 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]); 564 565 if (data[IFLA_VTI_OKEY]) 566 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]); 567 568 if (data[IFLA_VTI_LOCAL]) 569 parms->iph.saddr = nla_get_in_addr(data[IFLA_VTI_LOCAL]); 570 571 if (data[IFLA_VTI_REMOTE]) 572 parms->iph.daddr = nla_get_in_addr(data[IFLA_VTI_REMOTE]); 573 574 if (data[IFLA_VTI_FWMARK]) 575 *fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]); 576 } 577 578 static int vti_newlink(struct net *src_net, struct net_device *dev, 579 struct nlattr *tb[], struct nlattr *data[], 580 struct netlink_ext_ack *extack) 581 { 582 struct ip_tunnel_parm_kern parms; 583 __u32 fwmark = 0; 584 585 vti_netlink_parms(data, &parms, &fwmark); 586 return ip_tunnel_newlink(dev, tb, &parms, fwmark); 587 } 588 589 static int vti_changelink(struct net_device *dev, struct nlattr *tb[], 590 struct nlattr *data[], 591 struct netlink_ext_ack *extack) 592 { 593 struct ip_tunnel *t = netdev_priv(dev); 594 struct ip_tunnel_parm_kern p; 595 __u32 fwmark = t->fwmark; 596 597 vti_netlink_parms(data, &p, &fwmark); 598 return ip_tunnel_changelink(dev, tb, &p, fwmark); 599 } 600 601 static size_t vti_get_size(const struct net_device *dev) 602 { 603 return 604 /* IFLA_VTI_LINK */ 605 nla_total_size(4) + 606 /* IFLA_VTI_IKEY */ 607 nla_total_size(4) + 608 /* IFLA_VTI_OKEY */ 609 nla_total_size(4) + 610 /* IFLA_VTI_LOCAL */ 611 nla_total_size(4) + 612 /* IFLA_VTI_REMOTE */ 613 nla_total_size(4) + 614 /* IFLA_VTI_FWMARK */ 615 nla_total_size(4) + 616 0; 617 } 618 619 static int vti_fill_info(struct sk_buff *skb, const struct net_device *dev) 620 { 621 struct ip_tunnel *t = netdev_priv(dev); 622 struct ip_tunnel_parm_kern *p = &t->parms; 623 624 if (nla_put_u32(skb, IFLA_VTI_LINK, p->link) || 625 nla_put_be32(skb, IFLA_VTI_IKEY, p->i_key) || 626 nla_put_be32(skb, IFLA_VTI_OKEY, p->o_key) || 627 nla_put_in_addr(skb, IFLA_VTI_LOCAL, p->iph.saddr) || 628 nla_put_in_addr(skb, IFLA_VTI_REMOTE, p->iph.daddr) || 629 nla_put_u32(skb, IFLA_VTI_FWMARK, t->fwmark)) 630 return -EMSGSIZE; 631 632 return 0; 633 } 634 635 static const struct nla_policy vti_policy[IFLA_VTI_MAX + 1] = { 636 [IFLA_VTI_LINK] = { .type = NLA_U32 }, 637 [IFLA_VTI_IKEY] = { .type = NLA_U32 }, 638 [IFLA_VTI_OKEY] = { .type = NLA_U32 }, 639 [IFLA_VTI_LOCAL] = { .len = sizeof_field(struct iphdr, saddr) }, 640 [IFLA_VTI_REMOTE] = { .len = sizeof_field(struct iphdr, daddr) }, 641 [IFLA_VTI_FWMARK] = { .type = NLA_U32 }, 642 }; 643 644 static struct rtnl_link_ops vti_link_ops __read_mostly = { 645 .kind = "vti", 646 .maxtype = IFLA_VTI_MAX, 647 .policy = vti_policy, 648 .priv_size = sizeof(struct ip_tunnel), 649 .setup = vti_tunnel_setup, 650 .validate = vti_tunnel_validate, 651 .newlink = vti_newlink, 652 .changelink = vti_changelink, 653 .dellink = ip_tunnel_dellink, 654 .get_size = vti_get_size, 655 .fill_info = vti_fill_info, 656 .get_link_net = ip_tunnel_get_link_net, 657 }; 658 659 static int __init vti_init(void) 660 { 661 const char *msg; 662 int err; 663 664 pr_info("IPv4 over IPsec tunneling driver\n"); 665 666 msg = "tunnel device"; 667 err = register_pernet_device(&vti_net_ops); 668 if (err < 0) 669 goto pernet_dev_failed; 670 671 msg = "tunnel protocols"; 672 err = xfrm4_protocol_register(&vti_esp4_protocol, IPPROTO_ESP); 673 if (err < 0) 674 goto xfrm_proto_esp_failed; 675 err = xfrm4_protocol_register(&vti_ah4_protocol, IPPROTO_AH); 676 if (err < 0) 677 goto xfrm_proto_ah_failed; 678 err = xfrm4_protocol_register(&vti_ipcomp4_protocol, IPPROTO_COMP); 679 if (err < 0) 680 goto xfrm_proto_comp_failed; 681 682 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 683 msg = "ipip tunnel"; 684 err = xfrm4_tunnel_register(&vti_ipip_handler, AF_INET); 685 if (err < 0) 686 goto xfrm_tunnel_ipip_failed; 687 #if IS_ENABLED(CONFIG_IPV6) 688 err = xfrm4_tunnel_register(&vti_ipip6_handler, AF_INET6); 689 if (err < 0) 690 goto xfrm_tunnel_ipip6_failed; 691 #endif 692 #endif 693 694 msg = "netlink interface"; 695 err = rtnl_link_register(&vti_link_ops); 696 if (err < 0) 697 goto rtnl_link_failed; 698 699 return err; 700 701 rtnl_link_failed: 702 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 703 #if IS_ENABLED(CONFIG_IPV6) 704 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 705 xfrm_tunnel_ipip6_failed: 706 #endif 707 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 708 xfrm_tunnel_ipip_failed: 709 #endif 710 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 711 xfrm_proto_comp_failed: 712 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 713 xfrm_proto_ah_failed: 714 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 715 xfrm_proto_esp_failed: 716 unregister_pernet_device(&vti_net_ops); 717 pernet_dev_failed: 718 pr_err("vti init: failed to register %s\n", msg); 719 return err; 720 } 721 722 static void __exit vti_fini(void) 723 { 724 rtnl_link_unregister(&vti_link_ops); 725 #if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) 726 #if IS_ENABLED(CONFIG_IPV6) 727 xfrm4_tunnel_deregister(&vti_ipip6_handler, AF_INET6); 728 #endif 729 xfrm4_tunnel_deregister(&vti_ipip_handler, AF_INET); 730 #endif 731 xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP); 732 xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH); 733 xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP); 734 unregister_pernet_device(&vti_net_ops); 735 } 736 737 module_init(vti_init); 738 module_exit(vti_fini); 739 MODULE_DESCRIPTION("Virtual (secure) IP tunneling library"); 740 MODULE_LICENSE("GPL"); 741 MODULE_ALIAS_RTNL_LINK("vti"); 742 MODULE_ALIAS_NETDEV("ip_vti0"); 743