1 /* 2 * Linux NET3: IP/IP protocol decoder. 3 * 4 * Authors: 5 * Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 6 * 7 * Fixes: 8 * Alan Cox : Merged and made usable non modular (its so tiny its silly as 9 * a module taking up 2 pages). 10 * Alan Cox : Fixed bug with 1.3.18 and IPIP not working (now needs to set skb->h.iph) 11 * to keep ip_forward happy. 12 * Alan Cox : More fixes for 1.3.21, and firewall fix. Maybe this will work soon 8). 13 * Kai Schulte : Fixed #defines for IP_FIREWALL->FIREWALL 14 * David Woodhouse : Perform some basic ICMP handling. 15 * IPIP Routing without decapsulation. 16 * Carlos Picoto : GRE over IP support 17 * Alexey Kuznetsov: Reworked. Really, now it is truncated version of ipv4/ip_gre.c. 18 * I do not want to merge them together. 19 * 20 * This program is free software; you can redistribute it and/or 21 * modify it under the terms of the GNU General Public License 22 * as published by the Free Software Foundation; either version 23 * 2 of the License, or (at your option) any later version. 24 * 25 */ 26 27 /* tunnel.c: an IP tunnel driver 28 29 The purpose of this driver is to provide an IP tunnel through 30 which you can tunnel network traffic transparently across subnets. 31 32 This was written by looking at Nick Holloway's dummy driver 33 Thanks for the great code! 34 35 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/01/95 36 37 Minor tweaks: 38 Cleaned up the code a little and added some pre-1.3.0 tweaks. 39 dev->hard_header/hard_header_len changed to use no headers. 40 Comments/bracketing tweaked. 41 Made the tunnels use dev->name not tunnel: when error reporting. 42 Added tx_dropped stat 43 44 -Alan Cox (alan@lxorguk.ukuu.org.uk) 21 March 95 45 46 Reworked: 47 Changed to tunnel to destination gateway in addition to the 48 tunnel's pointopoint address 49 Almost completely rewritten 50 Note: There is currently no firewall or ICMP handling done. 51 52 -Sam Lantinga (slouken@cs.ucdavis.edu) 02/13/96 53 54 */ 55 56 /* Things I wish I had known when writing the tunnel driver: 57 58 When the tunnel_xmit() function is called, the skb contains the 59 packet to be sent (plus a great deal of extra info), and dev 60 contains the tunnel device that _we_ are. 61 62 When we are passed a packet, we are expected to fill in the 63 source address with our source IP address. 64 65 What is the proper way to allocate, copy and free a buffer? 66 After you allocate it, it is a "0 length" chunk of memory 67 starting at zero. If you want to add headers to the buffer 68 later, you'll have to call "skb_reserve(skb, amount)" with 69 the amount of memory you want reserved. Then, you call 70 "skb_put(skb, amount)" with the amount of space you want in 71 the buffer. skb_put() returns a pointer to the top (#0) of 72 that buffer. skb->len is set to the amount of space you have 73 "allocated" with skb_put(). You can then write up to skb->len 74 bytes to that buffer. If you need more, you can call skb_put() 75 again with the additional amount of space you need. You can 76 find out how much more space you can allocate by calling 77 "skb_tailroom(skb)". 78 Now, to add header space, call "skb_push(skb, header_len)". 79 This creates space at the beginning of the buffer and returns 80 a pointer to this new space. If later you need to strip a 81 header from a buffer, call "skb_pull(skb, header_len)". 82 skb_headroom() will return how much space is left at the top 83 of the buffer (before the main data). Remember, this headroom 84 space must be reserved before the skb_put() function is called. 85 */ 86 87 /* 88 This version of net/ipv4/ipip.c is cloned of net/ipv4/ip_gre.c 89 90 For comments look at net/ipv4/ip_gre.c --ANK 91 */ 92 93 94 #include <linux/capability.h> 95 #include <linux/module.h> 96 #include <linux/types.h> 97 #include <linux/kernel.h> 98 #include <linux/slab.h> 99 #include <linux/uaccess.h> 100 #include <linux/skbuff.h> 101 #include <linux/netdevice.h> 102 #include <linux/in.h> 103 #include <linux/tcp.h> 104 #include <linux/udp.h> 105 #include <linux/if_arp.h> 106 #include <linux/init.h> 107 #include <linux/netfilter_ipv4.h> 108 #include <linux/if_ether.h> 109 110 #include <net/sock.h> 111 #include <net/ip.h> 112 #include <net/icmp.h> 113 #include <net/ip_tunnels.h> 114 #include <net/inet_ecn.h> 115 #include <net/xfrm.h> 116 #include <net/net_namespace.h> 117 #include <net/netns/generic.h> 118 #include <net/dst_metadata.h> 119 120 static bool log_ecn_error = true; 121 module_param(log_ecn_error, bool, 0644); 122 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 123 124 static unsigned int ipip_net_id __read_mostly; 125 126 static int ipip_tunnel_init(struct net_device *dev); 127 static struct rtnl_link_ops ipip_link_ops __read_mostly; 128 129 static int ipip_err(struct sk_buff *skb, u32 info) 130 { 131 132 /* All the routers (except for Linux) return only 133 8 bytes of packet payload. It means, that precise relaying of 134 ICMP in the real Internet is absolutely infeasible. 135 */ 136 struct net *net = dev_net(skb->dev); 137 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); 138 const struct iphdr *iph = (const struct iphdr *)skb->data; 139 struct ip_tunnel *t; 140 int err; 141 const int type = icmp_hdr(skb)->type; 142 const int code = icmp_hdr(skb)->code; 143 144 err = -ENOENT; 145 t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 146 iph->daddr, iph->saddr, 0); 147 if (!t) 148 goto out; 149 150 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 151 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 152 t->parms.link, 0, iph->protocol, 0); 153 err = 0; 154 goto out; 155 } 156 157 if (type == ICMP_REDIRECT) { 158 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, 159 iph->protocol, 0); 160 err = 0; 161 goto out; 162 } 163 164 if (t->parms.iph.daddr == 0) 165 goto out; 166 167 err = 0; 168 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 169 goto out; 170 171 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 172 t->err_count++; 173 else 174 t->err_count = 1; 175 t->err_time = jiffies; 176 177 out: 178 return err; 179 } 180 181 static const struct tnl_ptk_info ipip_tpi = { 182 /* no tunnel info required for ipip. */ 183 .proto = htons(ETH_P_IP), 184 }; 185 186 #if IS_ENABLED(CONFIG_MPLS) 187 static const struct tnl_ptk_info mplsip_tpi = { 188 /* no tunnel info required for mplsip. */ 189 .proto = htons(ETH_P_MPLS_UC), 190 }; 191 #endif 192 193 static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 194 { 195 struct net *net = dev_net(skb->dev); 196 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); 197 struct metadata_dst *tun_dst = NULL; 198 struct ip_tunnel *tunnel; 199 const struct iphdr *iph; 200 201 iph = ip_hdr(skb); 202 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, 203 iph->saddr, iph->daddr, 0); 204 if (tunnel) { 205 const struct tnl_ptk_info *tpi; 206 207 if (tunnel->parms.iph.protocol != ipproto && 208 tunnel->parms.iph.protocol != 0) 209 goto drop; 210 211 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 212 goto drop; 213 #if IS_ENABLED(CONFIG_MPLS) 214 if (ipproto == IPPROTO_MPLS) 215 tpi = &mplsip_tpi; 216 else 217 #endif 218 tpi = &ipip_tpi; 219 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 220 goto drop; 221 if (tunnel->collect_md) { 222 tun_dst = ip_tun_rx_dst(skb, 0, 0, 0); 223 if (!tun_dst) 224 return 0; 225 } 226 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 227 } 228 229 return -1; 230 231 drop: 232 kfree_skb(skb); 233 return 0; 234 } 235 236 static int ipip_rcv(struct sk_buff *skb) 237 { 238 return ipip_tunnel_rcv(skb, IPPROTO_IPIP); 239 } 240 241 #if IS_ENABLED(CONFIG_MPLS) 242 static int mplsip_rcv(struct sk_buff *skb) 243 { 244 return ipip_tunnel_rcv(skb, IPPROTO_MPLS); 245 } 246 #endif 247 248 /* 249 * This function assumes it is being called from dev_queue_xmit() 250 * and that skb is filled properly by that function. 251 */ 252 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, 253 struct net_device *dev) 254 { 255 struct ip_tunnel *tunnel = netdev_priv(dev); 256 const struct iphdr *tiph = &tunnel->parms.iph; 257 u8 ipproto; 258 259 switch (skb->protocol) { 260 case htons(ETH_P_IP): 261 ipproto = IPPROTO_IPIP; 262 break; 263 #if IS_ENABLED(CONFIG_MPLS) 264 case htons(ETH_P_MPLS_UC): 265 ipproto = IPPROTO_MPLS; 266 break; 267 #endif 268 default: 269 goto tx_error; 270 } 271 272 if (tiph->protocol != ipproto && tiph->protocol != 0) 273 goto tx_error; 274 275 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 276 goto tx_error; 277 278 skb_set_inner_ipproto(skb, ipproto); 279 280 if (tunnel->collect_md) 281 ip_md_tunnel_xmit(skb, dev, ipproto); 282 else 283 ip_tunnel_xmit(skb, dev, tiph, ipproto); 284 return NETDEV_TX_OK; 285 286 tx_error: 287 kfree_skb(skb); 288 289 dev->stats.tx_errors++; 290 return NETDEV_TX_OK; 291 } 292 293 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) 294 { 295 switch (ipproto) { 296 case 0: 297 case IPPROTO_IPIP: 298 #if IS_ENABLED(CONFIG_MPLS) 299 case IPPROTO_MPLS: 300 #endif 301 return true; 302 } 303 304 return false; 305 } 306 307 static int 308 ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 309 { 310 int err = 0; 311 struct ip_tunnel_parm p; 312 313 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 314 return -EFAULT; 315 316 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 317 if (p.iph.version != 4 || 318 !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) || 319 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 320 return -EINVAL; 321 } 322 323 p.i_key = p.o_key = 0; 324 p.i_flags = p.o_flags = 0; 325 err = ip_tunnel_ioctl(dev, &p, cmd); 326 if (err) 327 return err; 328 329 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 330 return -EFAULT; 331 332 return 0; 333 } 334 335 static const struct net_device_ops ipip_netdev_ops = { 336 .ndo_init = ipip_tunnel_init, 337 .ndo_uninit = ip_tunnel_uninit, 338 .ndo_start_xmit = ipip_tunnel_xmit, 339 .ndo_do_ioctl = ipip_tunnel_ioctl, 340 .ndo_change_mtu = ip_tunnel_change_mtu, 341 .ndo_get_stats64 = ip_tunnel_get_stats64, 342 .ndo_get_iflink = ip_tunnel_get_iflink, 343 }; 344 345 #define IPIP_FEATURES (NETIF_F_SG | \ 346 NETIF_F_FRAGLIST | \ 347 NETIF_F_HIGHDMA | \ 348 NETIF_F_GSO_SOFTWARE | \ 349 NETIF_F_HW_CSUM) 350 351 static void ipip_tunnel_setup(struct net_device *dev) 352 { 353 dev->netdev_ops = &ipip_netdev_ops; 354 355 dev->type = ARPHRD_TUNNEL; 356 dev->flags = IFF_NOARP; 357 dev->addr_len = 4; 358 dev->features |= NETIF_F_LLTX; 359 netif_keep_dst(dev); 360 361 dev->features |= IPIP_FEATURES; 362 dev->hw_features |= IPIP_FEATURES; 363 ip_tunnel_setup(dev, ipip_net_id); 364 } 365 366 static int ipip_tunnel_init(struct net_device *dev) 367 { 368 struct ip_tunnel *tunnel = netdev_priv(dev); 369 370 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); 371 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 372 373 tunnel->tun_hlen = 0; 374 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 375 return ip_tunnel_init(dev); 376 } 377 378 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 379 struct netlink_ext_ack *extack) 380 { 381 u8 proto; 382 383 if (!data || !data[IFLA_IPTUN_PROTO]) 384 return 0; 385 386 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 387 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0) 388 return -EINVAL; 389 390 return 0; 391 } 392 393 static void ipip_netlink_parms(struct nlattr *data[], 394 struct ip_tunnel_parm *parms, bool *collect_md, 395 __u32 *fwmark) 396 { 397 memset(parms, 0, sizeof(*parms)); 398 399 parms->iph.version = 4; 400 parms->iph.protocol = IPPROTO_IPIP; 401 parms->iph.ihl = 5; 402 *collect_md = false; 403 404 if (!data) 405 return; 406 407 if (data[IFLA_IPTUN_LINK]) 408 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 409 410 if (data[IFLA_IPTUN_LOCAL]) 411 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]); 412 413 if (data[IFLA_IPTUN_REMOTE]) 414 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]); 415 416 if (data[IFLA_IPTUN_TTL]) { 417 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 418 if (parms->iph.ttl) 419 parms->iph.frag_off = htons(IP_DF); 420 } 421 422 if (data[IFLA_IPTUN_TOS]) 423 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 424 425 if (data[IFLA_IPTUN_PROTO]) 426 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 427 428 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 429 parms->iph.frag_off = htons(IP_DF); 430 431 if (data[IFLA_IPTUN_COLLECT_METADATA]) 432 *collect_md = true; 433 434 if (data[IFLA_IPTUN_FWMARK]) 435 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 436 } 437 438 /* This function returns true when ENCAP attributes are present in the nl msg */ 439 static bool ipip_netlink_encap_parms(struct nlattr *data[], 440 struct ip_tunnel_encap *ipencap) 441 { 442 bool ret = false; 443 444 memset(ipencap, 0, sizeof(*ipencap)); 445 446 if (!data) 447 return ret; 448 449 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 450 ret = true; 451 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 452 } 453 454 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 455 ret = true; 456 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 457 } 458 459 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 460 ret = true; 461 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 462 } 463 464 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 465 ret = true; 466 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 467 } 468 469 return ret; 470 } 471 472 static int ipip_newlink(struct net *src_net, struct net_device *dev, 473 struct nlattr *tb[], struct nlattr *data[], 474 struct netlink_ext_ack *extack) 475 { 476 struct ip_tunnel *t = netdev_priv(dev); 477 struct ip_tunnel_parm p; 478 struct ip_tunnel_encap ipencap; 479 __u32 fwmark = 0; 480 481 if (ipip_netlink_encap_parms(data, &ipencap)) { 482 int err = ip_tunnel_encap_setup(t, &ipencap); 483 484 if (err < 0) 485 return err; 486 } 487 488 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark); 489 return ip_tunnel_newlink(dev, tb, &p, fwmark); 490 } 491 492 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], 493 struct nlattr *data[], 494 struct netlink_ext_ack *extack) 495 { 496 struct ip_tunnel *t = netdev_priv(dev); 497 struct ip_tunnel_parm p; 498 struct ip_tunnel_encap ipencap; 499 bool collect_md; 500 __u32 fwmark = t->fwmark; 501 502 if (ipip_netlink_encap_parms(data, &ipencap)) { 503 int err = ip_tunnel_encap_setup(t, &ipencap); 504 505 if (err < 0) 506 return err; 507 } 508 509 ipip_netlink_parms(data, &p, &collect_md, &fwmark); 510 if (collect_md) 511 return -EINVAL; 512 513 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 514 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 515 return -EINVAL; 516 517 return ip_tunnel_changelink(dev, tb, &p, fwmark); 518 } 519 520 static size_t ipip_get_size(const struct net_device *dev) 521 { 522 return 523 /* IFLA_IPTUN_LINK */ 524 nla_total_size(4) + 525 /* IFLA_IPTUN_LOCAL */ 526 nla_total_size(4) + 527 /* IFLA_IPTUN_REMOTE */ 528 nla_total_size(4) + 529 /* IFLA_IPTUN_TTL */ 530 nla_total_size(1) + 531 /* IFLA_IPTUN_TOS */ 532 nla_total_size(1) + 533 /* IFLA_IPTUN_PROTO */ 534 nla_total_size(1) + 535 /* IFLA_IPTUN_PMTUDISC */ 536 nla_total_size(1) + 537 /* IFLA_IPTUN_ENCAP_TYPE */ 538 nla_total_size(2) + 539 /* IFLA_IPTUN_ENCAP_FLAGS */ 540 nla_total_size(2) + 541 /* IFLA_IPTUN_ENCAP_SPORT */ 542 nla_total_size(2) + 543 /* IFLA_IPTUN_ENCAP_DPORT */ 544 nla_total_size(2) + 545 /* IFLA_IPTUN_COLLECT_METADATA */ 546 nla_total_size(0) + 547 /* IFLA_IPTUN_FWMARK */ 548 nla_total_size(4) + 549 0; 550 } 551 552 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) 553 { 554 struct ip_tunnel *tunnel = netdev_priv(dev); 555 struct ip_tunnel_parm *parm = &tunnel->parms; 556 557 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 558 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 559 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 560 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 561 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 562 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 563 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 564 !!(parm->iph.frag_off & htons(IP_DF))) || 565 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 566 goto nla_put_failure; 567 568 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 569 tunnel->encap.type) || 570 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 571 tunnel->encap.sport) || 572 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 573 tunnel->encap.dport) || 574 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 575 tunnel->encap.flags)) 576 goto nla_put_failure; 577 578 if (tunnel->collect_md) 579 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 580 goto nla_put_failure; 581 return 0; 582 583 nla_put_failure: 584 return -EMSGSIZE; 585 } 586 587 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { 588 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 589 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 590 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 591 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 592 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 593 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 594 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 595 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 596 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 597 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 598 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 599 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 600 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 601 }; 602 603 static struct rtnl_link_ops ipip_link_ops __read_mostly = { 604 .kind = "ipip", 605 .maxtype = IFLA_IPTUN_MAX, 606 .policy = ipip_policy, 607 .priv_size = sizeof(struct ip_tunnel), 608 .setup = ipip_tunnel_setup, 609 .validate = ipip_tunnel_validate, 610 .newlink = ipip_newlink, 611 .changelink = ipip_changelink, 612 .dellink = ip_tunnel_dellink, 613 .get_size = ipip_get_size, 614 .fill_info = ipip_fill_info, 615 .get_link_net = ip_tunnel_get_link_net, 616 }; 617 618 static struct xfrm_tunnel ipip_handler __read_mostly = { 619 .handler = ipip_rcv, 620 .err_handler = ipip_err, 621 .priority = 1, 622 }; 623 624 #if IS_ENABLED(CONFIG_MPLS) 625 static struct xfrm_tunnel mplsip_handler __read_mostly = { 626 .handler = mplsip_rcv, 627 .err_handler = ipip_err, 628 .priority = 1, 629 }; 630 #endif 631 632 static int __net_init ipip_init_net(struct net *net) 633 { 634 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); 635 } 636 637 static void __net_exit ipip_exit_net(struct net *net) 638 { 639 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); 640 ip_tunnel_delete_net(itn, &ipip_link_ops); 641 } 642 643 static struct pernet_operations ipip_net_ops = { 644 .init = ipip_init_net, 645 .exit = ipip_exit_net, 646 .id = &ipip_net_id, 647 .size = sizeof(struct ip_tunnel_net), 648 }; 649 650 static int __init ipip_init(void) 651 { 652 int err; 653 654 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n"); 655 656 err = register_pernet_device(&ipip_net_ops); 657 if (err < 0) 658 return err; 659 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 660 if (err < 0) { 661 pr_info("%s: can't register tunnel\n", __func__); 662 goto xfrm_tunnel_ipip_failed; 663 } 664 #if IS_ENABLED(CONFIG_MPLS) 665 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 666 if (err < 0) { 667 pr_info("%s: can't register tunnel\n", __func__); 668 goto xfrm_tunnel_mplsip_failed; 669 } 670 #endif 671 err = rtnl_link_register(&ipip_link_ops); 672 if (err < 0) 673 goto rtnl_link_failed; 674 675 out: 676 return err; 677 678 rtnl_link_failed: 679 #if IS_ENABLED(CONFIG_MPLS) 680 xfrm4_tunnel_deregister(&mplsip_handler, AF_INET); 681 xfrm_tunnel_mplsip_failed: 682 683 #endif 684 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 685 xfrm_tunnel_ipip_failed: 686 unregister_pernet_device(&ipip_net_ops); 687 goto out; 688 } 689 690 static void __exit ipip_fini(void) 691 { 692 rtnl_link_unregister(&ipip_link_ops); 693 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) 694 pr_info("%s: can't deregister tunnel\n", __func__); 695 #if IS_ENABLED(CONFIG_MPLS) 696 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS)) 697 pr_info("%s: can't deregister tunnel\n", __func__); 698 #endif 699 unregister_pernet_device(&ipip_net_ops); 700 } 701 702 module_init(ipip_init); 703 module_exit(ipip_fini); 704 MODULE_LICENSE("GPL"); 705 MODULE_ALIAS_RTNL_LINK("ipip"); 706 MODULE_ALIAS_NETDEV("tunl0"); 707