1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux NET3: IP/IP protocol decoder. 4 * 5 * Authors: 6 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 7 * 8 * Fixes: 9 * Alan Cox : Merged and made usable non modular (its so tiny its silly as 10 * a module taking up 2 pages). 11 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) 12 * to keep ip_forward happy. 13 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). 14 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL 15 * David Woodhouse : Perform some basic ICMP handling. 16 * IPIP Routing without decapsulation. 17 * Carlos Picoto : GRE over IP support 18 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. 19 * I do not want to merge them together. 20 */ 21 22 /* tunnel.c: an IP tunnel driver 23 24 The purpose of this driver is to provide an IP tunnel through 25 which you can tunnel network traffic transparently across subnets. 26 27 This was written by looking at Nick Holloway's dummy driver 28 Thanks for the great code! 29 30 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 31 32 Minor tweaks: 33 Cleaned up the code a little and added some pre-1.3.0 tweaks. 34 dev->hard_header/hard_header_len changed to use no headers. 35 Comments/bracketing tweaked. 36 Made the tunnels use dev->name not tunnel: when error reporting. 37 Added tx_dropped stat 38 39 -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 40 41 Reworked: 42 Changed to tunnel to destination gateway in addition to the 43 tunnel's pointopoint address 44 Almost completely rewritten 45 Note: There is currently no firewall or ICMP handling done. 46 47 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 48 49 */ 50 51 /* Things I wish I had known when writing the tunnel driver: 52 53 When the tunnel_xmit() function is called, the skb contains the 54 packet to be sent (plus a great deal of extra info), and dev 55 contains the tunnel device that _we_ are. 56 57 When we are passed a packet, we are expected to fill in the 58 source address with our source IP address. 59 60 What is the proper way to allocate, copy and free a buffer? 61 After you allocate it, it is a "0 length" chunk of memory 62 starting at zero. If you want to add headers to the buffer 63 later, you'll have to call "skb_reserve(skb, amount)" with 64 the amount of memory you want reserved. Then, you call 65 "skb_put(skb, amount)" with the amount of space you want in 66 the buffer. skb_put() returns a pointer to the top (#0) of 67 that buffer. skb->len is set to the amount of space you have 68 "allocated" with skb_put(). You can then write up to skb->len 69 bytes to that buffer. If you need more, you can call skb_put() 70 again with the additional amount of space you need. You can 71 find out how much more space you can allocate by calling 72 "skb_tailroom(skb)". 73 Now, to add header space, call "skb_push(skb, header_len)". 74 This creates space at the beginning of the buffer and returns 75 a pointer to this new space. If later you need to strip a 76 header from a buffer, call "skb_pull(skb, header_len)". 77 skb_headroom() will return how much space is left at the top 78 of the buffer (before the main data). Remember, this headroom 79 space must be reserved before the skb_put() function is called. 80 */ 81 82 /* 83 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c 84 85 For comments look at net/ipv4/ip_gre.c --ANK 86 */ 87 88 89 #include <linux/capability.h> 90 #include <linux/module.h> 91 #include <linux/types.h> 92 #include <linux/kernel.h> 93 #include <linux/slab.h> 94 #include <linux/uaccess.h> 95 #include <linux/skbuff.h> 96 #include <linux/netdevice.h> 97 #include <linux/in.h> 98 #include <linux/tcp.h> 99 #include <linux/udp.h> 100 #include <linux/if_arp.h> 101 #include <linux/init.h> 102 #include <linux/netfilter_ipv4.h> 103 #include <linux/if_ether.h> 104 105 #include <net/sock.h> 106 #include <net/ip.h> 107 #include <net/icmp.h> 108 #include <net/ip_tunnels.h> 109 #include <net/inet_ecn.h> 110 #include <net/xfrm.h> 111 #include <net/net_namespace.h> 112 #include <net/netns/generic.h> 113 #include <net/dst_metadata.h> 114 115 static bool log_ecn_error = true; 116 module_param(log_ecn_error, bool, 0644); 117 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 118 119 static unsigned int ipip_net_id __read_mostly; 120 121 static int ipip_tunnel_init(struct net_device *dev); 122 static struct rtnl_link_ops ipip_link_ops __read_mostly; 123 124 static int ipip_err(struct sk_buff *skb, u32 info) 125 { 126 /* All the routers (except for Linux) return only 127 * 8 bytes of packet payload. It means, that precise relaying of 128 * ICMP in the real Internet is absolutely infeasible. 129 */ 130 struct net *net = dev_net(skb->dev); 131 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); 132 const struct iphdr *iph = (const struct iphdr *)skb->data; 133 const int type = icmp_hdr(skb)->type; 134 const int code = icmp_hdr(skb)->code; 135 struct ip_tunnel *t; 136 int err = 0; 137 138 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 139 iph->daddr, iph->saddr, 0); 140 if (!t) { 141 err = -ENOENT; 142 goto out; 143 } 144 145 switch (type) { 146 case ICMP_DEST_UNREACH: 147 switch (code) { 148 case ICMP_SR_FAILED: 149 /* Impossible event. */ 150 goto out; 151 default: 152 /* All others are translated to HOST_UNREACH. 153 * rfc2003 contains "deep thoughts" about NET_UNREACH, 154 * I believe they are just ether pollution. --ANK 155 */ 156 break; 157 } 158 break; 159 160 case ICMP_TIME_EXCEEDED: 161 if (code != ICMP_EXC_TTL) 162 goto out; 163 break; 164 165 case ICMP_REDIRECT: 166 break; 167 168 default: 169 goto out; 170 } 171 172 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 173 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol); 174 goto out; 175 } 176 177 if (type == ICMP_REDIRECT) { 178 ipv4_redirect(skb, net, t->parms.link, iph->protocol); 179 goto out; 180 } 181 182 if (t->parms.iph.daddr == 0) { 183 err = -ENOENT; 184 goto out; 185 } 186 187 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 188 goto out; 189 190 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 191 t->err_count++; 192 else 193 t->err_count = 1; 194 t->err_time = jiffies; 195 196 out: 197 return err; 198 } 199 200 static const struct tnl_ptk_info ipip_tpi = { 201 /* no tunnel info required for ipip. */ 202 .proto = htons(ETH_P_IP), 203 }; 204 205 #if IS_ENABLED(CONFIG_MPLS) 206 static const struct tnl_ptk_info mplsip_tpi = { 207 /* no tunnel info required for mplsip. */ 208 .proto = htons(ETH_P_MPLS_UC), 209 }; 210 #endif 211 212 static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 213 { 214 struct net *net = dev_net(skb->dev); 215 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); 216 struct metadata_dst *tun_dst = NULL; 217 struct ip_tunnel *tunnel; 218 const struct iphdr *iph; 219 220 iph = ip_hdr(skb); 221 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 222 iph->saddr, iph->daddr, 0); 223 if (tunnel) { 224 const struct tnl_ptk_info *tpi; 225 226 if (tunnel->parms.iph.protocol != ipproto && 227 tunnel->parms.iph.protocol != 0) 228 goto drop; 229 230 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 231 goto drop; 232 #if IS_ENABLED(CONFIG_MPLS) 233 if (ipproto == IPPROTO_MPLS) 234 tpi = &mplsip_tpi; 235 else 236 #endif 237 tpi = &ipip_tpi; 238 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 239 goto drop; 240 if (tunnel->collect_md) { 241 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0); 242 if (!tun_dst) 243 return 0; 244 } 245 skb_reset_mac_header(skb); 246 247 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 248 } 249 250 return -1; 251 252 drop: 253 kfree_skb(skb); 254 return 0; 255 } 256 257 static int ipip_rcv(struct sk_buff *skb) 258 { 259 return ipip_tunnel_rcv(skb, IPPROTO_IPIP); 260 } 261 262 #if IS_ENABLED(CONFIG_MPLS) 263 static int mplsip_rcv(struct sk_buff *skb) 264 { 265 return ipip_tunnel_rcv(skb, IPPROTO_MPLS); 266 } 267 #endif 268 269 /* 270 * This function assumes it is being called from dev_queue_xmit() 271 * and that skb is filled properly by that function. 272 */ 273 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, 274 struct net_device *dev) 275 { 276 struct ip_tunnel *tunnel = netdev_priv(dev); 277 const struct iphdr *tiph = &tunnel->parms.iph; 278 u8 ipproto; 279 280 if (!pskb_inet_may_pull(skb)) 281 goto tx_error; 282 283 switch (skb->protocol) { 284 case htons(ETH_P_IP): 285 ipproto = IPPROTO_IPIP; 286 break; 287 #if IS_ENABLED(CONFIG_MPLS) 288 case htons(ETH_P_MPLS_UC): 289 ipproto = IPPROTO_MPLS; 290 break; 291 #endif 292 default: 293 goto tx_error; 294 } 295 296 if (tiph->protocol != ipproto && tiph->protocol != 0) 297 goto tx_error; 298 299 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 300 goto tx_error; 301 302 skb_set_inner_ipproto(skb, ipproto); 303 304 if (tunnel->collect_md) 305 ip_md_tunnel_xmit(skb, dev, ipproto, 0); 306 else 307 ip_tunnel_xmit(skb, dev, tiph, ipproto); 308 return NETDEV_TX_OK; 309 310 tx_error: 311 kfree_skb(skb); 312 313 dev->stats.tx_errors++; 314 return NETDEV_TX_OK; 315 } 316 317 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) 318 { 319 switch (ipproto) { 320 case 0: 321 case IPPROTO_IPIP: 322 #if IS_ENABLED(CONFIG_MPLS) 323 case IPPROTO_MPLS: 324 #endif 325 return true; 326 } 327 328 return false; 329 } 330 331 static int 332 ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 333 { 334 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 335 if (p->iph.version != 4 || 336 !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) || 337 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 338 return -EINVAL; 339 } 340 341 p->i_key = p->o_key = 0; 342 p->i_flags = p->o_flags = 0; 343 return ip_tunnel_ctl(dev, p, cmd); 344 } 345 346 static const struct net_device_ops ipip_netdev_ops = { 347 .ndo_init = ipip_tunnel_init, 348 .ndo_uninit = ip_tunnel_uninit, 349 .ndo_start_xmit = ipip_tunnel_xmit, 350 .ndo_siocdevprivate = ip_tunnel_siocdevprivate, 351 .ndo_change_mtu = ip_tunnel_change_mtu, 352 .ndo_get_stats64 = dev_get_tstats64, 353 .ndo_get_iflink = ip_tunnel_get_iflink, 354 .ndo_tunnel_ctl = ipip_tunnel_ctl, 355 }; 356 357 #define IPIP_FEATURES (NETIF_F_SG | \ 358 NETIF_F_FRAGLIST | \ 359 NETIF_F_HIGHDMA | \ 360 NETIF_F_GSO_SOFTWARE | \ 361 NETIF_F_HW_CSUM) 362 363 static void ipip_tunnel_setup(struct net_device *dev) 364 { 365 dev->netdev_ops = &ipip_netdev_ops; 366 dev->header_ops = &ip_tunnel_header_ops; 367 368 dev->type = ARPHRD_TUNNEL; 369 dev->flags = IFF_NOARP; 370 dev->addr_len = 4; 371 dev->features |= NETIF_F_LLTX; 372 netif_keep_dst(dev); 373 374 dev->features |= IPIP_FEATURES; 375 dev->hw_features |= IPIP_FEATURES; 376 ip_tunnel_setup(dev, ipip_net_id); 377 } 378 379 static int ipip_tunnel_init(struct net_device *dev) 380 { 381 struct ip_tunnel *tunnel = netdev_priv(dev); 382 383 __dev_addr_set(dev, &tunnel->parms.iph.saddr, 4); 384 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 385 386 tunnel->tun_hlen = 0; 387 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 388 return ip_tunnel_init(dev); 389 } 390 391 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 392 struct netlink_ext_ack *extack) 393 { 394 u8 proto; 395 396 if (!data || !data[IFLA_IPTUN_PROTO]) 397 return 0; 398 399 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 400 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0) 401 return -EINVAL; 402 403 return 0; 404 } 405 406 static void ipip_netlink_parms(struct nlattr *data[], 407 struct ip_tunnel_parm *parms, bool *collect_md, 408 __u32 *fwmark) 409 { 410 memset(parms, 0, sizeof(*parms)); 411 412 parms->iph.version = 4; 413 parms->iph.protocol = IPPROTO_IPIP; 414 parms->iph.ihl = 5; 415 *collect_md = false; 416 417 if (!data) 418 return; 419 420 ip_tunnel_netlink_parms(data, parms); 421 422 if (data[IFLA_IPTUN_COLLECT_METADATA]) 423 *collect_md = true; 424 425 if (data[IFLA_IPTUN_FWMARK]) 426 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 427 } 428 429 static int ipip_newlink(struct net *src_net, struct net_device *dev, 430 struct nlattr *tb[], struct nlattr *data[], 431 struct netlink_ext_ack *extack) 432 { 433 struct ip_tunnel *t = netdev_priv(dev); 434 struct ip_tunnel_parm p; 435 struct ip_tunnel_encap ipencap; 436 __u32 fwmark = 0; 437 438 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 439 int err = ip_tunnel_encap_setup(t, &ipencap); 440 441 if (err < 0) 442 return err; 443 } 444 445 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark); 446 return ip_tunnel_newlink(dev, tb, &p, fwmark); 447 } 448 449 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], 450 struct nlattr *data[], 451 struct netlink_ext_ack *extack) 452 { 453 struct ip_tunnel *t = netdev_priv(dev); 454 struct ip_tunnel_parm p; 455 struct ip_tunnel_encap ipencap; 456 bool collect_md; 457 __u32 fwmark = t->fwmark; 458 459 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 460 int err = ip_tunnel_encap_setup(t, &ipencap); 461 462 if (err < 0) 463 return err; 464 } 465 466 ipip_netlink_parms(data, &p, &collect_md, &fwmark); 467 if (collect_md) 468 return -EINVAL; 469 470 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 471 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 472 return -EINVAL; 473 474 return ip_tunnel_changelink(dev, tb, &p, fwmark); 475 } 476 477 static size_t ipip_get_size(const struct net_device *dev) 478 { 479 return 480 /* IFLA_IPTUN_LINK */ 481 nla_total_size(4) + 482 /* IFLA_IPTUN_LOCAL */ 483 nla_total_size(4) + 484 /* IFLA_IPTUN_REMOTE */ 485 nla_total_size(4) + 486 /* IFLA_IPTUN_TTL */ 487 nla_total_size(1) + 488 /* IFLA_IPTUN_TOS */ 489 nla_total_size(1) + 490 /* IFLA_IPTUN_PROTO */ 491 nla_total_size(1) + 492 /* IFLA_IPTUN_PMTUDISC */ 493 nla_total_size(1) + 494 /* IFLA_IPTUN_ENCAP_TYPE */ 495 nla_total_size(2) + 496 /* IFLA_IPTUN_ENCAP_FLAGS */ 497 nla_total_size(2) + 498 /* IFLA_IPTUN_ENCAP_SPORT */ 499 nla_total_size(2) + 500 /* IFLA_IPTUN_ENCAP_DPORT */ 501 nla_total_size(2) + 502 /* IFLA_IPTUN_COLLECT_METADATA */ 503 nla_total_size(0) + 504 /* IFLA_IPTUN_FWMARK */ 505 nla_total_size(4) + 506 0; 507 } 508 509 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) 510 { 511 struct ip_tunnel *tunnel = netdev_priv(dev); 512 struct ip_tunnel_parm *parm = &tunnel->parms; 513 514 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 515 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 516 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 517 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 518 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 519 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 520 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 521 !!(parm->iph.frag_off & htons(IP_DF))) || 522 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 523 goto nla_put_failure; 524 525 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 526 tunnel->encap.type) || 527 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 528 tunnel->encap.sport) || 529 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 530 tunnel->encap.dport) || 531 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 532 tunnel->encap.flags)) 533 goto nla_put_failure; 534 535 if (tunnel->collect_md) 536 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 537 goto nla_put_failure; 538 return 0; 539 540 nla_put_failure: 541 return -EMSGSIZE; 542 } 543 544 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { 545 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 546 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 547 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 548 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 549 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 550 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 551 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 552 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 553 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 554 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 555 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 556 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 557 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 558 }; 559 560 static struct rtnl_link_ops ipip_link_ops __read_mostly = { 561 .kind = "ipip", 562 .maxtype = IFLA_IPTUN_MAX, 563 .policy = ipip_policy, 564 .priv_size = sizeof(struct ip_tunnel), 565 .setup = ipip_tunnel_setup, 566 .validate = ipip_tunnel_validate, 567 .newlink = ipip_newlink, 568 .changelink = ipip_changelink, 569 .dellink = ip_tunnel_dellink, 570 .get_size = ipip_get_size, 571 .fill_info = ipip_fill_info, 572 .get_link_net = ip_tunnel_get_link_net, 573 }; 574 575 static struct xfrm_tunnel ipip_handler __read_mostly = { 576 .handler = ipip_rcv, 577 .err_handler = ipip_err, 578 .priority = 1, 579 }; 580 581 #if IS_ENABLED(CONFIG_MPLS) 582 static struct xfrm_tunnel mplsip_handler __read_mostly = { 583 .handler = mplsip_rcv, 584 .err_handler = ipip_err, 585 .priority = 1, 586 }; 587 #endif 588 589 static int __net_init ipip_init_net(struct net *net) 590 { 591 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); 592 } 593 594 static void __net_exit ipip_exit_batch_net(struct list_head *list_net) 595 { 596 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops); 597 } 598 599 static struct pernet_operations ipip_net_ops = { 600 .init = ipip_init_net, 601 .exit_batch = ipip_exit_batch_net, 602 .id = &ipip_net_id, 603 .size = sizeof(struct ip_tunnel_net), 604 }; 605 606 static int __init ipip_init(void) 607 { 608 int err; 609 610 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n"); 611 612 err = register_pernet_device(&ipip_net_ops); 613 if (err < 0) 614 return err; 615 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 616 if (err < 0) { 617 pr_info("%s: can't register tunnel\n", __func__); 618 goto xfrm_tunnel_ipip_failed; 619 } 620 #if IS_ENABLED(CONFIG_MPLS) 621 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 622 if (err < 0) { 623 pr_info("%s: can't register tunnel\n", __func__); 624 goto xfrm_tunnel_mplsip_failed; 625 } 626 #endif 627 err = rtnl_link_register(&ipip_link_ops); 628 if (err < 0) 629 goto rtnl_link_failed; 630 631 out: 632 return err; 633 634 rtnl_link_failed: 635 #if IS_ENABLED(CONFIG_MPLS) 636 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 637 xfrm_tunnel_mplsip_failed: 638 639 #endif 640 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 641 xfrm_tunnel_ipip_failed: 642 unregister_pernet_device(&ipip_net_ops); 643 goto out; 644 } 645 646 static void __exit ipip_fini(void) 647 { 648 rtnl_link_unregister(&ipip_link_ops); 649 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) 650 pr_info("%s: can't deregister tunnel\n", __func__); 651 #if IS_ENABLED(CONFIG_MPLS) 652 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS)) 653 pr_info("%s: can't deregister tunnel\n", __func__); 654 #endif 655 unregister_pernet_device(&ipip_net_ops); 656 } 657 658 module_init(ipip_init); 659 module_exit(ipip_fini); 660 MODULE_LICENSE("GPL"); 661 MODULE_ALIAS_RTNL_LINK("ipip"); 662 MODULE_ALIAS_NETDEV("tunl0"); 663