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 return ip_tunnel_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error); 246 } 247 248 return -1; 249 250 drop: 251 kfree_skb(skb); 252 return 0; 253 } 254 255 static int ipip_rcv(struct sk_buff *skb) 256 { 257 return ipip_tunnel_rcv(skb, IPPROTO_IPIP); 258 } 259 260 #if IS_ENABLED(CONFIG_MPLS) 261 static int mplsip_rcv(struct sk_buff *skb) 262 { 263 return ipip_tunnel_rcv(skb, IPPROTO_MPLS); 264 } 265 #endif 266 267 /* 268 * This function assumes it is being called from dev_queue_xmit() 269 * and that skb is filled properly by that function. 270 */ 271 static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, 272 struct net_device *dev) 273 { 274 struct ip_tunnel *tunnel = netdev_priv(dev); 275 const struct iphdr *tiph = &tunnel->parms.iph; 276 u8 ipproto; 277 278 if (!pskb_inet_may_pull(skb)) 279 goto tx_error; 280 281 switch (skb->protocol) { 282 case htons(ETH_P_IP): 283 ipproto = IPPROTO_IPIP; 284 break; 285 #if IS_ENABLED(CONFIG_MPLS) 286 case htons(ETH_P_MPLS_UC): 287 ipproto = IPPROTO_MPLS; 288 break; 289 #endif 290 default: 291 goto tx_error; 292 } 293 294 if (tiph->protocol != ipproto && tiph->protocol != 0) 295 goto tx_error; 296 297 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 298 goto tx_error; 299 300 skb_set_inner_ipproto(skb, ipproto); 301 302 if (tunnel->collect_md) 303 ip_md_tunnel_xmit(skb, dev, ipproto, 0); 304 else 305 ip_tunnel_xmit(skb, dev, tiph, ipproto); 306 return NETDEV_TX_OK; 307 308 tx_error: 309 kfree_skb(skb); 310 311 dev->stats.tx_errors++; 312 return NETDEV_TX_OK; 313 } 314 315 static bool ipip_tunnel_ioctl_verify_protocol(u8 ipproto) 316 { 317 switch (ipproto) { 318 case 0: 319 case IPPROTO_IPIP: 320 #if IS_ENABLED(CONFIG_MPLS) 321 case IPPROTO_MPLS: 322 #endif 323 return true; 324 } 325 326 return false; 327 } 328 329 static int 330 ipip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 331 { 332 int err = 0; 333 struct ip_tunnel_parm p; 334 335 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 336 return -EFAULT; 337 338 if (cmd == SIOCADDTUNNEL || cmd == SIOCCHGTUNNEL) { 339 if (p.iph.version != 4 || 340 !ipip_tunnel_ioctl_verify_protocol(p.iph.protocol) || 341 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 342 return -EINVAL; 343 } 344 345 p.i_key = p.o_key = 0; 346 p.i_flags = p.o_flags = 0; 347 err = ip_tunnel_ioctl(dev, &p, cmd); 348 if (err) 349 return err; 350 351 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 352 return -EFAULT; 353 354 return 0; 355 } 356 357 static const struct net_device_ops ipip_netdev_ops = { 358 .ndo_init = ipip_tunnel_init, 359 .ndo_uninit = ip_tunnel_uninit, 360 .ndo_start_xmit = ipip_tunnel_xmit, 361 .ndo_do_ioctl = ipip_tunnel_ioctl, 362 .ndo_change_mtu = ip_tunnel_change_mtu, 363 .ndo_get_stats64 = ip_tunnel_get_stats64, 364 .ndo_get_iflink = ip_tunnel_get_iflink, 365 }; 366 367 #define IPIP_FEATURES (NETIF_F_SG | \ 368 NETIF_F_FRAGLIST | \ 369 NETIF_F_HIGHDMA | \ 370 NETIF_F_GSO_SOFTWARE | \ 371 NETIF_F_HW_CSUM) 372 373 static void ipip_tunnel_setup(struct net_device *dev) 374 { 375 dev->netdev_ops = &ipip_netdev_ops; 376 377 dev->type = ARPHRD_TUNNEL; 378 dev->flags = IFF_NOARP; 379 dev->addr_len = 4; 380 dev->features |= NETIF_F_LLTX; 381 netif_keep_dst(dev); 382 383 dev->features |= IPIP_FEATURES; 384 dev->hw_features |= IPIP_FEATURES; 385 ip_tunnel_setup(dev, ipip_net_id); 386 } 387 388 static int ipip_tunnel_init(struct net_device *dev) 389 { 390 struct ip_tunnel *tunnel = netdev_priv(dev); 391 392 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); 393 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 394 395 tunnel->tun_hlen = 0; 396 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen; 397 return ip_tunnel_init(dev); 398 } 399 400 static int ipip_tunnel_validate(struct nlattr *tb[], struct nlattr *data[], 401 struct netlink_ext_ack *extack) 402 { 403 u8 proto; 404 405 if (!data || !data[IFLA_IPTUN_PROTO]) 406 return 0; 407 408 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 409 if (proto != IPPROTO_IPIP && proto != IPPROTO_MPLS && proto != 0) 410 return -EINVAL; 411 412 return 0; 413 } 414 415 static void ipip_netlink_parms(struct nlattr *data[], 416 struct ip_tunnel_parm *parms, bool *collect_md, 417 __u32 *fwmark) 418 { 419 memset(parms, 0, sizeof(*parms)); 420 421 parms->iph.version = 4; 422 parms->iph.protocol = IPPROTO_IPIP; 423 parms->iph.ihl = 5; 424 *collect_md = false; 425 426 if (!data) 427 return; 428 429 if (data[IFLA_IPTUN_LINK]) 430 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 431 432 if (data[IFLA_IPTUN_LOCAL]) 433 parms->iph.saddr = nla_get_in_addr(data[IFLA_IPTUN_LOCAL]); 434 435 if (data[IFLA_IPTUN_REMOTE]) 436 parms->iph.daddr = nla_get_in_addr(data[IFLA_IPTUN_REMOTE]); 437 438 if (data[IFLA_IPTUN_TTL]) { 439 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 440 if (parms->iph.ttl) 441 parms->iph.frag_off = htons(IP_DF); 442 } 443 444 if (data[IFLA_IPTUN_TOS]) 445 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 446 447 if (data[IFLA_IPTUN_PROTO]) 448 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 449 450 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 451 parms->iph.frag_off = htons(IP_DF); 452 453 if (data[IFLA_IPTUN_COLLECT_METADATA]) 454 *collect_md = true; 455 456 if (data[IFLA_IPTUN_FWMARK]) 457 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 458 } 459 460 /* This function returns true when ENCAP attributes are present in the nl msg */ 461 static bool ipip_netlink_encap_parms(struct nlattr *data[], 462 struct ip_tunnel_encap *ipencap) 463 { 464 bool ret = false; 465 466 memset(ipencap, 0, sizeof(*ipencap)); 467 468 if (!data) 469 return ret; 470 471 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 472 ret = true; 473 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 474 } 475 476 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 477 ret = true; 478 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 479 } 480 481 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 482 ret = true; 483 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 484 } 485 486 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 487 ret = true; 488 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 489 } 490 491 return ret; 492 } 493 494 static int ipip_newlink(struct net *src_net, struct net_device *dev, 495 struct nlattr *tb[], struct nlattr *data[], 496 struct netlink_ext_ack *extack) 497 { 498 struct ip_tunnel *t = netdev_priv(dev); 499 struct ip_tunnel_parm p; 500 struct ip_tunnel_encap ipencap; 501 __u32 fwmark = 0; 502 503 if (ipip_netlink_encap_parms(data, &ipencap)) { 504 int err = ip_tunnel_encap_setup(t, &ipencap); 505 506 if (err < 0) 507 return err; 508 } 509 510 ipip_netlink_parms(data, &p, &t->collect_md, &fwmark); 511 return ip_tunnel_newlink(dev, tb, &p, fwmark); 512 } 513 514 static int ipip_changelink(struct net_device *dev, struct nlattr *tb[], 515 struct nlattr *data[], 516 struct netlink_ext_ack *extack) 517 { 518 struct ip_tunnel *t = netdev_priv(dev); 519 struct ip_tunnel_parm p; 520 struct ip_tunnel_encap ipencap; 521 bool collect_md; 522 __u32 fwmark = t->fwmark; 523 524 if (ipip_netlink_encap_parms(data, &ipencap)) { 525 int err = ip_tunnel_encap_setup(t, &ipencap); 526 527 if (err < 0) 528 return err; 529 } 530 531 ipip_netlink_parms(data, &p, &collect_md, &fwmark); 532 if (collect_md) 533 return -EINVAL; 534 535 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 536 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 537 return -EINVAL; 538 539 return ip_tunnel_changelink(dev, tb, &p, fwmark); 540 } 541 542 static size_t ipip_get_size(const struct net_device *dev) 543 { 544 return 545 /* IFLA_IPTUN_LINK */ 546 nla_total_size(4) + 547 /* IFLA_IPTUN_LOCAL */ 548 nla_total_size(4) + 549 /* IFLA_IPTUN_REMOTE */ 550 nla_total_size(4) + 551 /* IFLA_IPTUN_TTL */ 552 nla_total_size(1) + 553 /* IFLA_IPTUN_TOS */ 554 nla_total_size(1) + 555 /* IFLA_IPTUN_PROTO */ 556 nla_total_size(1) + 557 /* IFLA_IPTUN_PMTUDISC */ 558 nla_total_size(1) + 559 /* IFLA_IPTUN_ENCAP_TYPE */ 560 nla_total_size(2) + 561 /* IFLA_IPTUN_ENCAP_FLAGS */ 562 nla_total_size(2) + 563 /* IFLA_IPTUN_ENCAP_SPORT */ 564 nla_total_size(2) + 565 /* IFLA_IPTUN_ENCAP_DPORT */ 566 nla_total_size(2) + 567 /* IFLA_IPTUN_COLLECT_METADATA */ 568 nla_total_size(0) + 569 /* IFLA_IPTUN_FWMARK */ 570 nla_total_size(4) + 571 0; 572 } 573 574 static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) 575 { 576 struct ip_tunnel *tunnel = netdev_priv(dev); 577 struct ip_tunnel_parm *parm = &tunnel->parms; 578 579 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 580 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 581 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 582 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 583 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 584 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 585 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 586 !!(parm->iph.frag_off & htons(IP_DF))) || 587 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 588 goto nla_put_failure; 589 590 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 591 tunnel->encap.type) || 592 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 593 tunnel->encap.sport) || 594 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 595 tunnel->encap.dport) || 596 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 597 tunnel->encap.flags)) 598 goto nla_put_failure; 599 600 if (tunnel->collect_md) 601 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 602 goto nla_put_failure; 603 return 0; 604 605 nla_put_failure: 606 return -EMSGSIZE; 607 } 608 609 static const struct nla_policy ipip_policy[IFLA_IPTUN_MAX + 1] = { 610 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 611 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 612 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 613 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 614 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 615 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 616 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 617 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 618 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 619 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 620 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 621 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 622 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 623 }; 624 625 static struct rtnl_link_ops ipip_link_ops __read_mostly = { 626 .kind = "ipip", 627 .maxtype = IFLA_IPTUN_MAX, 628 .policy = ipip_policy, 629 .priv_size = sizeof(struct ip_tunnel), 630 .setup = ipip_tunnel_setup, 631 .validate = ipip_tunnel_validate, 632 .newlink = ipip_newlink, 633 .changelink = ipip_changelink, 634 .dellink = ip_tunnel_dellink, 635 .get_size = ipip_get_size, 636 .fill_info = ipip_fill_info, 637 .get_link_net = ip_tunnel_get_link_net, 638 }; 639 640 static struct xfrm_tunnel ipip_handler __read_mostly = { 641 .handler = ipip_rcv, 642 .err_handler = ipip_err, 643 .priority = 1, 644 }; 645 646 #if IS_ENABLED(CONFIG_MPLS) 647 static struct xfrm_tunnel mplsip_handler __read_mostly = { 648 .handler = mplsip_rcv, 649 .err_handler = ipip_err, 650 .priority = 1, 651 }; 652 #endif 653 654 static int __net_init ipip_init_net(struct net *net) 655 { 656 return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0"); 657 } 658 659 static void __net_exit ipip_exit_batch_net(struct list_head *list_net) 660 { 661 ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops); 662 } 663 664 static struct pernet_operations ipip_net_ops = { 665 .init = ipip_init_net, 666 .exit_batch = ipip_exit_batch_net, 667 .id = &ipip_net_id, 668 .size = sizeof(struct ip_tunnel_net), 669 }; 670 671 static int __init ipip_init(void) 672 { 673 int err; 674 675 pr_info("ipip: IPv4 and MPLS over IPv4 tunneling driver\n"); 676 677 err = register_pernet_device(&ipip_net_ops); 678 if (err < 0) 679 return err; 680 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 681 if (err < 0) { 682 pr_info("%s: can't register tunnel\n", __func__); 683 goto xfrm_tunnel_ipip_failed; 684 } 685 #if IS_ENABLED(CONFIG_MPLS) 686 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 687 if (err < 0) { 688 pr_info("%s: can't register tunnel\n", __func__); 689 goto xfrm_tunnel_mplsip_failed; 690 } 691 #endif 692 err = rtnl_link_register(&ipip_link_ops); 693 if (err < 0) 694 goto rtnl_link_failed; 695 696 out: 697 return err; 698 699 rtnl_link_failed: 700 #if IS_ENABLED(CONFIG_MPLS) 701 xfrm4_tunnel_deregister(&mplsip_handler, AF_INET); 702 xfrm_tunnel_mplsip_failed: 703 704 #endif 705 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 706 xfrm_tunnel_ipip_failed: 707 unregister_pernet_device(&ipip_net_ops); 708 goto out; 709 } 710 711 static void __exit ipip_fini(void) 712 { 713 rtnl_link_unregister(&ipip_link_ops); 714 if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET)) 715 pr_info("%s: can't deregister tunnel\n", __func__); 716 #if IS_ENABLED(CONFIG_MPLS) 717 if (xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS)) 718 pr_info("%s: can't deregister tunnel\n", __func__); 719 #endif 720 unregister_pernet_device(&ipip_net_ops); 721 } 722 723 module_init(ipip_init); 724 module_exit(ipip_fini); 725 MODULE_LICENSE("GPL"); 726 MODULE_ALIAS_RTNL_LINK("ipip"); 727 MODULE_ALIAS_NETDEV("tunl0"); 728