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 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 134 const int type = icmp_hdr(skb)->type; 135 const int code = icmp_hdr(skb)->code; 136 struct ip_tunnel *t; 137 int err = 0; 138 139 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags); 140 141 t = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, iph->daddr, 142 iph->saddr, 0); 143 if (!t) { 144 err = -ENOENT; 145 goto out; 146 } 147 148 switch (type) { 149 case ICMP_DEST_UNREACH: 150 switch (code) { 151 case ICMP_SR_FAILED: 152 /* Impossible event. */ 153 goto out; 154 default: 155 /* All others are translated to HOST_UNREACH. 156 * rfc2003 contains "deep thoughts" about NET_UNREACH, 157 * I believe they are just ether pollution. --ANK 158 */ 159 break; 160 } 161 break; 162 163 case ICMP_TIME_EXCEEDED: 164 if (code != ICMP_EXC_TTL) 165 goto out; 166 break; 167 168 case ICMP_REDIRECT: 169 break; 170 171 default: 172 goto out; 173 } 174 175 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 176 ipv4_update_pmtu(skb, net, info, t->parms.link, iph->protocol); 177 goto out; 178 } 179 180 if (type == ICMP_REDIRECT) { 181 ipv4_redirect(skb, net, t->parms.link, iph->protocol); 182 goto out; 183 } 184 185 if (t->parms.iph.daddr == 0) { 186 err = -ENOENT; 187 goto out; 188 } 189 190 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 191 goto out; 192 193 if (time_before(jiffies, READ_ONCE(t->err_time) + IPTUNNEL_ERR_TIMEO)) 194 WRITE_ONCE(t->err_count, READ_ONCE(t->err_count) + 1); 195 else 196 WRITE_ONCE(t->err_count, 1); 197 WRITE_ONCE(t->err_time, jiffies); 198 199 out: 200 return err; 201 } 202 203 static const struct tnl_ptk_info ipip_tpi = { 204 /* no tunnel info required for ipip. */ 205 .proto = htons(ETH_P_IP), 206 }; 207 208 #if IS_ENABLED(CONFIG_MPLS) 209 static const struct tnl_ptk_info mplsip_tpi = { 210 /* no tunnel info required for mplsip. */ 211 .proto = htons(ETH_P_MPLS_UC), 212 }; 213 #endif 214 215 static int ipip_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 216 { 217 struct net *net = dev_net(skb->dev); 218 struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); 219 IP_TUNNEL_DECLARE_FLAGS(flags) = { }; 220 struct metadata_dst *tun_dst = NULL; 221 struct ip_tunnel *tunnel; 222 const struct iphdr *iph; 223 224 __set_bit(IP_TUNNEL_NO_KEY_BIT, flags); 225 226 iph = ip_hdr(skb); 227 tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, flags, iph->saddr, 228 iph->daddr, 0); 229 if (tunnel) { 230 const struct tnl_ptk_info *tpi; 231 232 if (tunnel->parms.iph.protocol != ipproto && 233 tunnel->parms.iph.protocol != 0) 234 goto drop; 235 236 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 237 goto drop; 238 #if IS_ENABLED(CONFIG_MPLS) 239 if (ipproto == IPPROTO_MPLS) 240 tpi = &mplsip_tpi; 241 else 242 #endif 243 tpi = &ipip_tpi; 244 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 245 goto drop; 246 if (tunnel->collect_md) { 247 ip_tunnel_flags_zero(flags); 248 249 tun_dst = ip_tun_rx_dst(skb, flags, 0, 0); 250 if (!tun_dst) 251 goto drop; 252 ip_tunnel_md_udp_encap(skb, &tun_dst->u.tun_info); 253 } 254 skb_reset_mac_header(skb); 255 256 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 257 } 258 259 return -1; 260 261 drop: 262 kfree_skb(skb); 263 return 0; 264 } 265 266 static int ipip_rcv(struct sk_buff *skb) 267 { 268 return ipip_tunnel_rcv(skb, IPPROTO_IPIP); 269 } 270 271 #if IS_ENABLED(CONFIG_MPLS) 272 static int mplsip_rcv(struct sk_buff *skb) 273 { 274 return ipip_tunnel_rcv(skb, IPPROTO_MPLS); 275 } 276 #endif 277 278 /* 279 * This function assumes it is being called from dev_queue_xmit() 280 * and that skb is filled properly by that function. 281 */ 282 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, 283 struct net_device *dev) 284 { 285 struct ip_tunnel *tunnel = netdev_priv(dev); 286 const struct iphdr *tiph = &tunnel->parms.iph; 287 u8 ipproto; 288 289 if (!pskb_inet_may_pull(skb)) 290 goto tx_error; 291 292 switch (skb->protocol) { 293 case htons(ETH_P_IP): 294 ipproto = IPPROTO_IPIP; 295 break; 296 #if IS_ENABLED(CONFIG_MPLS) 297 case htons(ETH_P_MPLS_UC): 298 ipproto = IPPROTO_MPLS; 299 break; 300 #endif 301 default: 302 goto tx_error; 303 } 304 305 if (tiph->protocol != ipproto && tiph->protocol != 0) 306 goto tx_error; 307 308 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 309 goto tx_error; 310 311 skb_set_inner_ipproto(skb, ipproto); 312 313 if (tunnel->collect_md) 314 ip_md_tunnel_xmit(skb, dev, ipproto, 0); 315 else 316 ip_tunnel_xmit(skb, dev, tiph, ipproto); 317 return NETDEV_TX_OK; 318 319 tx_error: 320 kfree_skb(skb); 321 322 DEV_STATS_INC(dev, tx_errors); 323 return NETDEV_TX_OK; 324 } 325 326 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) 327 { 328 switch (ipproto) { 329 case 0: 330 case IPPROTO_IPIP: 331 #if IS_ENABLED(CONFIG_MPLS) 332 case IPPROTO_MPLS: 333 #endif 334 return true; 335 } 336 337 return false; 338 } 339 340 static int 341 ipip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, int cmd) 342 { 343 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 344 if (p->iph.version != 4 || 345 !ipip_tunnel_ioctl_verify_protocol(p->iph.protocol) || 346 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 347 return -EINVAL; 348 } 349 350 p->i_key = p->o_key = 0; 351 ip_tunnel_flags_zero(p->i_flags); 352 ip_tunnel_flags_zero(p->o_flags); 353 return ip_tunnel_ctl(dev, p, cmd); 354 } 355 356 static int ipip_fill_forward_path(struct net_device_path_ctx *ctx, 357 struct net_device_path *path) 358 { 359 struct ip_tunnel *tunnel = netdev_priv(ctx->dev); 360 const struct iphdr *tiph = &tunnel->parms.iph; 361 struct rtable *rt; 362 363 if (ctx->ether_type != cpu_to_be16(ETH_P_IP)) 364 return -EOPNOTSUPP; 365 366 if (tunnel->collect_md) 367 return -EOPNOTSUPP; 368 369 if (tunnel->parms.iph.tos & 0x1) 370 return -EOPNOTSUPP; 371 372 rt = ip_route_output(dev_net(ctx->dev), tiph->daddr, tiph->saddr, 373 inet_dsfield_to_dscp(tiph->tos), 374 tunnel->parms.link, RT_SCOPE_UNIVERSE); 375 if (IS_ERR(rt)) 376 return PTR_ERR(rt); 377 378 path->type = DEV_PATH_TUN; 379 path->tun.src_v4.s_addr = tiph->saddr; 380 path->tun.dst_v4.s_addr = tiph->daddr; 381 path->tun.inner_proto = IPPROTO_IPIP; 382 path->tun.encap_proto = AF_INET; 383 path->tun.dst = &rt->dst; 384 path->dev = ctx->dev; 385 386 ctx->dev = rt->dst.dev; 387 388 return 0; 389 } 390 391 static const struct net_device_ops ipip_netdev_ops = { 392 .ndo_init = ipip_tunnel_init, 393 .ndo_uninit = ip_tunnel_uninit, 394 .ndo_start_xmit = ipip_tunnel_xmit, 395 .ndo_siocdevprivate = ip_tunnel_siocdevprivate, 396 .ndo_change_mtu = ip_tunnel_change_mtu, 397 .ndo_get_stats64 = dev_get_tstats64, 398 .ndo_get_iflink = ip_tunnel_get_iflink, 399 .ndo_tunnel_ctl = ipip_tunnel_ctl, 400 .ndo_fill_forward_path = ipip_fill_forward_path, 401 }; 402 403 #define IPIP_FEATURES (NETIF_F_SG | \ 404 NETIF_F_FRAGLIST | \ 405 NETIF_F_HIGHDMA | \ 406 NETIF_F_GSO_SOFTWARE | \ 407 NETIF_F_HW_CSUM) 408 409 static void ipip_tunnel_setup(struct net_device *dev) 410 { 411 dev->netdev_ops = &ipip_netdev_ops; 412 dev->header_ops = &ip_tunnel_header_ops; 413 414 dev->type = ARPHRD_TUNNEL; 415 dev->flags = IFF_NOARP; 416 dev->addr_len = 4; 417 dev->lltx = true; 418 netif_keep_dst(dev); 419 420 dev->features |= IPIP_FEATURES; 421 dev->hw_features |= IPIP_FEATURES; 422 ip_tunnel_setup(dev, ipip_net_id); 423 } 424 425 static int ipip_tunnel_init(struct net_device *dev) 426 { 427 struct ip_tunnel *tunnel = netdev_priv(dev); 428 429 __dev_addr_set(dev, &tunnel->parms.iph.saddr, 4); 430 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 431 432 tunnel->tun_hlen = 0; 433 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 434 return ip_tunnel_init(dev); 435 } 436 437 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 438 struct netlink_ext_ack *extack) 439 { 440 u8 proto; 441 442 if (!data || !data[IFLA_IPTUN_PROTO]) 443 return 0; 444 445 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 446 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0) 447 return -EINVAL; 448 449 return 0; 450 } 451 452 static void ipip_netlink_parms(struct nlattr *data[], 453 struct ip_tunnel_parm_kern *parms, 454 bool *collect_md, __u32 *fwmark) 455 { 456 memset(parms, 0, sizeof(*parms)); 457 458 parms->iph.version = 4; 459 parms->iph.protocol = IPPROTO_IPIP; 460 parms->iph.ihl = 5; 461 *collect_md = false; 462 463 if (!data) 464 return; 465 466 ip_tunnel_netlink_parms(data, parms); 467 468 if (data[IFLA_IPTUN_COLLECT_METADATA]) 469 *collect_md = true; 470 471 if (data[IFLA_IPTUN_FWMARK]) 472 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 473 } 474 475 static int ipip_newlink(struct net_device *dev, 476 struct rtnl_newlink_params *params, 477 struct netlink_ext_ack *extack) 478 { 479 struct ip_tunnel *t = netdev_priv(dev); 480 struct nlattr **data = params->data; 481 struct nlattr **tb = params->tb; 482 struct ip_tunnel_encap ipencap; 483 struct ip_tunnel_parm_kern p; 484 __u32 fwmark = 0; 485 486 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 487 int err = ip_tunnel_encap_setup(t, &ipencap); 488 489 if (err < 0) 490 return err; 491 } 492 493 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark); 494 return ip_tunnel_newlink(params->link_net ? : dev_net(dev), dev, tb, &p, 495 fwmark); 496 } 497 498 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], 499 struct nlattr *data[], 500 struct netlink_ext_ack *extack) 501 { 502 struct ip_tunnel *t = netdev_priv(dev); 503 struct ip_tunnel_encap ipencap; 504 struct ip_tunnel_parm_kern p; 505 bool collect_md; 506 __u32 fwmark = t->fwmark; 507 508 if (!rtnl_dev_link_net_capable(dev, t->net)) 509 return -EPERM; 510 511 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 512 int err = ip_tunnel_encap_setup(t, &ipencap); 513 514 if (err < 0) 515 return err; 516 } 517 518 ipip_netlink_parms(data, &p, &collect_md, &fwmark); 519 if (collect_md) 520 return -EINVAL; 521 522 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 523 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 524 return -EINVAL; 525 526 return ip_tunnel_changelink(dev, tb, &p, fwmark); 527 } 528 529 static size_t ipip_get_size(const struct net_device *dev) 530 { 531 return 532 /* IFLA_IPTUN_LINK */ 533 nla_total_size(4) + 534 /* IFLA_IPTUN_LOCAL */ 535 nla_total_size(4) + 536 /* IFLA_IPTUN_REMOTE */ 537 nla_total_size(4) + 538 /* IFLA_IPTUN_TTL */ 539 nla_total_size(1) + 540 /* IFLA_IPTUN_TOS */ 541 nla_total_size(1) + 542 /* IFLA_IPTUN_PROTO */ 543 nla_total_size(1) + 544 /* IFLA_IPTUN_PMTUDISC */ 545 nla_total_size(1) + 546 /* IFLA_IPTUN_ENCAP_TYPE */ 547 nla_total_size(2) + 548 /* IFLA_IPTUN_ENCAP_FLAGS */ 549 nla_total_size(2) + 550 /* IFLA_IPTUN_ENCAP_SPORT */ 551 nla_total_size(2) + 552 /* IFLA_IPTUN_ENCAP_DPORT */ 553 nla_total_size(2) + 554 /* IFLA_IPTUN_COLLECT_METADATA */ 555 nla_total_size(0) + 556 /* IFLA_IPTUN_FWMARK */ 557 nla_total_size(4) + 558 0; 559 } 560 561 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) 562 { 563 struct ip_tunnel *tunnel = netdev_priv(dev); 564 struct ip_tunnel_parm_kern *parm = &tunnel->parms; 565 566 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 567 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 568 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 569 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 570 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 571 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 572 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 573 !!(parm->iph.frag_off & htons(IP_DF))) || 574 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 575 goto nla_put_failure; 576 577 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 578 tunnel->encap.type) || 579 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 580 tunnel->encap.sport) || 581 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 582 tunnel->encap.dport) || 583 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 584 tunnel->encap.flags)) 585 goto nla_put_failure; 586 587 if (tunnel->collect_md) 588 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 589 goto nla_put_failure; 590 return 0; 591 592 nla_put_failure: 593 return -EMSGSIZE; 594 } 595 596 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { 597 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 598 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 599 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 600 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 601 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 602 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 603 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 604 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 605 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 606 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 607 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 608 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 609 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 610 }; 611 612 static struct rtnl_link_ops ipip_link_ops __read_mostly = { 613 .kind = "ipip", 614 .maxtype = IFLA_IPTUN_MAX, 615 .policy = ipip_policy, 616 .priv_size = sizeof(struct ip_tunnel), 617 .setup = ipip_tunnel_setup, 618 .validate = ipip_tunnel_validate, 619 .newlink = ipip_newlink, 620 .changelink = ipip_changelink, 621 .dellink = ip_tunnel_dellink, 622 .get_size = ipip_get_size, 623 .fill_info = ipip_fill_info, 624 .get_link_net = ip_tunnel_get_link_net, 625 }; 626 627 static struct xfrm_tunnel ipip_handler __read_mostly = { 628 .handler = ipip_rcv, 629 .err_handler = ipip_err, 630 .priority = 1, 631 }; 632 633 #if IS_ENABLED(CONFIG_MPLS) 634 static struct xfrm_tunnel mplsip_handler __read_mostly = { 635 .handler = mplsip_rcv, 636 .err_handler = ipip_err, 637 .priority = 1, 638 }; 639 #endif 640 641 static int __net_init ipip_init_net(struct net *net) 642 { 643 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); 644 } 645 646 static void __net_exit ipip_exit_rtnl(struct net *net, 647 struct list_head *dev_to_kill) 648 { 649 ip_tunnel_delete_net(net, ipip_net_id, dev_to_kill); 650 } 651 652 static struct pernet_operations ipip_net_ops = { 653 .init = ipip_init_net, 654 .exit_rtnl = ipip_exit_rtnl, 655 .id = &ipip_net_id, 656 .size = sizeof(struct ip_tunnel_net), 657 }; 658 659 static int __init ipip_init(void) 660 { 661 int err; 662 663 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n"); 664 665 err = register_pernet_device(&ipip_net_ops); 666 if (err < 0) 667 return err; 668 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 669 if (err < 0) { 670 pr_info("%s: can't register tunnel\n", __func__); 671 goto xfrm_tunnel_ipip_failed; 672 } 673 #if IS_ENABLED(CONFIG_MPLS) 674 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 675 if (err < 0) { 676 pr_info("%s: can't register tunnel\n", __func__); 677 goto xfrm_tunnel_mplsip_failed; 678 } 679 #endif 680 err = rtnl_link_register(&ipip_link_ops); 681 if (err < 0) 682 goto rtnl_link_failed; 683 684 out: 685 return err; 686 687 rtnl_link_failed: 688 #if IS_ENABLED(CONFIG_MPLS) 689 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 690 xfrm_tunnel_mplsip_failed: 691 692 #endif 693 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 694 xfrm_tunnel_ipip_failed: 695 unregister_pernet_device(&ipip_net_ops); 696 goto out; 697 } 698 699 static void __exit ipip_fini(void) 700 { 701 rtnl_link_unregister(&ipip_link_ops); 702 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) 703 pr_info("%s: can't deregister tunnel\n", __func__); 704 #if IS_ENABLED(CONFIG_MPLS) 705 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS)) 706 pr_info("%s: can't deregister tunnel\n", __func__); 707 #endif 708 unregister_pernet_device(&ipip_net_ops); 709 } 710 711 module_init(ipip_init); 712 module_exit(ipip_fini); 713 MODULE_DESCRIPTION("IP/IP protocol decoder library"); 714 MODULE_LICENSE("GPL"); 715 MODULE_ALIAS_RTNL_LINK("ipip"); 716 MODULE_ALIAS_NETDEV("tunl0"); 717