1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 * 10 * Changes: 11 * Roger Venning <r.venning@telstra.com>: 6to4 support 12 * Nate Thompson <nate@thebog.net>: 6to4 support 13 * Fred Templin <fred.l.templin@boeing.com>: isatap support 14 */ 15 16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18#include <linux/module.h> 19#include <linux/capability.h> 20#include <linux/errno.h> 21#include <linux/types.h> 22#include <linux/socket.h> 23#include <linux/sockios.h> 24#include <linux/net.h> 25#include <linux/in6.h> 26#include <linux/netdevice.h> 27#include <linux/if_arp.h> 28#include <linux/icmp.h> 29#include <linux/slab.h> 30#include <linux/uaccess.h> 31#include <linux/init.h> 32#include <linux/netfilter_ipv4.h> 33#include <linux/if_ether.h> 34 35#include <net/sock.h> 36#include <net/snmp.h> 37 38#include <net/ipv6.h> 39#include <net/protocol.h> 40#include <net/transp_v6.h> 41#include <net/ip6_fib.h> 42#include <net/ip6_route.h> 43#include <net/ndisc.h> 44#include <net/addrconf.h> 45#include <net/ip.h> 46#include <net/udp.h> 47#include <net/icmp.h> 48#include <net/ip_tunnels.h> 49#include <net/inet_ecn.h> 50#include <net/xfrm.h> 51#include <net/dsfield.h> 52#include <net/net_namespace.h> 53#include <net/netns/generic.h> 54 55/* 56 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 57 58 For comments look at net/ipv4/ip_gre.c --ANK 59 */ 60 61#define IP6_SIT_HASH_SIZE 16 62#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 63 64static bool log_ecn_error = true; 65module_param(log_ecn_error, bool, 0644); 66MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 67 68static int ipip6_tunnel_init(struct net_device *dev); 69static void ipip6_tunnel_setup(struct net_device *dev); 70static void ipip6_dev_free(struct net_device *dev); 71static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 72 __be32 *v4dst); 73static struct rtnl_link_ops sit_link_ops __read_mostly; 74 75static unsigned int sit_net_id __read_mostly; 76struct sit_net { 77 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 78 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 79 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_wc[1]; 81 struct ip_tunnel __rcu **tunnels[4]; 82 83 struct net_device *fb_tunnel_dev; 84}; 85 86static inline struct sit_net *dev_to_sit_net(struct net_device *dev) 87{ 88 struct ip_tunnel *t = netdev_priv(dev); 89 90 return net_generic(t->net, sit_net_id); 91} 92 93/* 94 * Must be invoked with rcu_read_lock 95 */ 96static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 97 struct net_device *dev, 98 __be32 remote, __be32 local, 99 int sifindex) 100{ 101 unsigned int h0 = HASH(remote); 102 unsigned int h1 = HASH(local); 103 struct ip_tunnel *t; 104 struct sit_net *sitn = net_generic(net, sit_net_id); 105 int ifindex = dev ? dev->ifindex : 0; 106 107 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 108 if (local == t->parms.iph.saddr && 109 remote == t->parms.iph.daddr && 110 (!dev || !t->parms.link || ifindex == t->parms.link || 111 sifindex == t->parms.link) && 112 (t->dev->flags & IFF_UP)) 113 return t; 114 } 115 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 116 if (remote == t->parms.iph.daddr && 117 (!dev || !t->parms.link || ifindex == t->parms.link || 118 sifindex == t->parms.link) && 119 (t->dev->flags & IFF_UP)) 120 return t; 121 } 122 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 123 if (local == t->parms.iph.saddr && 124 (!dev || !t->parms.link || ifindex == t->parms.link || 125 sifindex == t->parms.link) && 126 (t->dev->flags & IFF_UP)) 127 return t; 128 } 129 t = rcu_dereference(sitn->tunnels_wc[0]); 130 if (t && (t->dev->flags & IFF_UP)) 131 return t; 132 return NULL; 133} 134 135static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 136 struct ip_tunnel_parm *parms) 137{ 138 __be32 remote = parms->iph.daddr; 139 __be32 local = parms->iph.saddr; 140 unsigned int h = 0; 141 int prio = 0; 142 143 if (remote) { 144 prio |= 2; 145 h ^= HASH(remote); 146 } 147 if (local) { 148 prio |= 1; 149 h ^= HASH(local); 150 } 151 return &sitn->tunnels[prio][h]; 152} 153 154static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 155 struct ip_tunnel *t) 156{ 157 return __ipip6_bucket(sitn, &t->parms); 158} 159 160static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 161{ 162 struct ip_tunnel __rcu **tp; 163 struct ip_tunnel *iter; 164 165 for (tp = ipip6_bucket(sitn, t); 166 (iter = rtnl_dereference(*tp)) != NULL; 167 tp = &iter->next) { 168 if (t == iter) { 169 rcu_assign_pointer(*tp, t->next); 170 break; 171 } 172 } 173} 174 175static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 176{ 177 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 178 179 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 180 rcu_assign_pointer(*tp, t); 181} 182 183static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 184{ 185#ifdef CONFIG_IPV6_SIT_6RD 186 struct ip_tunnel *t = netdev_priv(dev); 187 188 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 189 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 190 t->ip6rd.relay_prefix = 0; 191 t->ip6rd.prefixlen = 16; 192 t->ip6rd.relay_prefixlen = 0; 193 } else { 194 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 195 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 196 } 197#endif 198} 199 200static int ipip6_tunnel_create(struct net_device *dev) 201{ 202 struct ip_tunnel *t = netdev_priv(dev); 203 struct net *net = dev_net(dev); 204 struct sit_net *sitn = net_generic(net, sit_net_id); 205 int err; 206 207 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); 208 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 209 210 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 211 dev->priv_flags |= IFF_ISATAP; 212 213 dev->rtnl_link_ops = &sit_link_ops; 214 215 err = register_netdevice(dev); 216 if (err < 0) 217 goto out; 218 219 ipip6_tunnel_clone_6rd(dev, sitn); 220 221 ipip6_tunnel_link(sitn, t); 222 return 0; 223 224out: 225 return err; 226} 227 228static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 229 struct ip_tunnel_parm *parms, int create) 230{ 231 __be32 remote = parms->iph.daddr; 232 __be32 local = parms->iph.saddr; 233 struct ip_tunnel *t, *nt; 234 struct ip_tunnel __rcu **tp; 235 struct net_device *dev; 236 char name[IFNAMSIZ]; 237 struct sit_net *sitn = net_generic(net, sit_net_id); 238 239 for (tp = __ipip6_bucket(sitn, parms); 240 (t = rtnl_dereference(*tp)) != NULL; 241 tp = &t->next) { 242 if (local == t->parms.iph.saddr && 243 remote == t->parms.iph.daddr && 244 parms->link == t->parms.link) { 245 if (create) 246 return NULL; 247 else 248 return t; 249 } 250 } 251 if (!create) 252 goto failed; 253 254 if (parms->name[0]) { 255 if (!dev_valid_name(parms->name)) 256 goto failed; 257 strlcpy(name, parms->name, IFNAMSIZ); 258 } else { 259 strcpy(name, "sit%d"); 260 } 261 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 262 ipip6_tunnel_setup); 263 if (!dev) 264 return NULL; 265 266 dev_net_set(dev, net); 267 268 nt = netdev_priv(dev); 269 270 nt->parms = *parms; 271 if (ipip6_tunnel_create(dev) < 0) 272 goto failed_free; 273 274 return nt; 275 276failed_free: 277 free_netdev(dev); 278failed: 279 return NULL; 280} 281 282#define for_each_prl_rcu(start) \ 283 for (prl = rcu_dereference(start); \ 284 prl; \ 285 prl = rcu_dereference(prl->next)) 286 287static struct ip_tunnel_prl_entry * 288__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 289{ 290 struct ip_tunnel_prl_entry *prl; 291 292 for_each_prl_rcu(t->prl) 293 if (prl->addr == addr) 294 break; 295 return prl; 296 297} 298 299static int ipip6_tunnel_get_prl(struct net_device *dev, struct ifreq *ifr) 300{ 301 struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data; 302 struct ip_tunnel *t = netdev_priv(dev); 303 struct ip_tunnel_prl kprl, *kp; 304 struct ip_tunnel_prl_entry *prl; 305 unsigned int cmax, c = 0, ca, len; 306 int ret = 0; 307 308 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 309 return -EINVAL; 310 311 if (copy_from_user(&kprl, a, sizeof(kprl))) 312 return -EFAULT; 313 cmax = kprl.datalen / sizeof(kprl); 314 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 315 cmax = 1; 316 317 /* For simple GET or for root users, 318 * we try harder to allocate. 319 */ 320 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 321 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : 322 NULL; 323 324 ca = min(t->prl_count, cmax); 325 326 if (!kp) { 327 /* We don't try hard to allocate much memory for 328 * non-root users. 329 * For root users, retry allocating enough memory for 330 * the answer. 331 */ 332 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 333 if (!kp) { 334 ret = -ENOMEM; 335 goto out; 336 } 337 } 338 339 rcu_read_lock(); 340 for_each_prl_rcu(t->prl) { 341 if (c >= cmax) 342 break; 343 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 344 continue; 345 kp[c].addr = prl->addr; 346 kp[c].flags = prl->flags; 347 c++; 348 if (kprl.addr != htonl(INADDR_ANY)) 349 break; 350 } 351 352 rcu_read_unlock(); 353 354 len = sizeof(*kp) * c; 355 ret = 0; 356 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 357 ret = -EFAULT; 358 359 kfree(kp); 360out: 361 return ret; 362} 363 364static int 365ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 366{ 367 struct ip_tunnel_prl_entry *p; 368 int err = 0; 369 370 if (a->addr == htonl(INADDR_ANY)) 371 return -EINVAL; 372 373 ASSERT_RTNL(); 374 375 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 376 if (p->addr == a->addr) { 377 if (chg) { 378 p->flags = a->flags; 379 goto out; 380 } 381 err = -EEXIST; 382 goto out; 383 } 384 } 385 386 if (chg) { 387 err = -ENXIO; 388 goto out; 389 } 390 391 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 392 if (!p) { 393 err = -ENOBUFS; 394 goto out; 395 } 396 397 p->next = t->prl; 398 p->addr = a->addr; 399 p->flags = a->flags; 400 t->prl_count++; 401 rcu_assign_pointer(t->prl, p); 402out: 403 return err; 404} 405 406static void prl_list_destroy_rcu(struct rcu_head *head) 407{ 408 struct ip_tunnel_prl_entry *p, *n; 409 410 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 411 do { 412 n = rcu_dereference_protected(p->next, 1); 413 kfree(p); 414 p = n; 415 } while (p); 416} 417 418static int 419ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 420{ 421 struct ip_tunnel_prl_entry *x; 422 struct ip_tunnel_prl_entry __rcu **p; 423 int err = 0; 424 425 ASSERT_RTNL(); 426 427 if (a && a->addr != htonl(INADDR_ANY)) { 428 for (p = &t->prl; 429 (x = rtnl_dereference(*p)) != NULL; 430 p = &x->next) { 431 if (x->addr == a->addr) { 432 *p = x->next; 433 kfree_rcu(x, rcu_head); 434 t->prl_count--; 435 goto out; 436 } 437 } 438 err = -ENXIO; 439 } else { 440 x = rtnl_dereference(t->prl); 441 if (x) { 442 t->prl_count = 0; 443 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 444 t->prl = NULL; 445 } 446 } 447out: 448 return err; 449} 450 451static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, 452 int cmd) 453{ 454 struct ip_tunnel *t = netdev_priv(dev); 455 struct ip_tunnel_prl prl; 456 int err; 457 458 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 459 return -EPERM; 460 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 461 return -EINVAL; 462 463 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 464 return -EFAULT; 465 466 switch (cmd) { 467 case SIOCDELPRL: 468 err = ipip6_tunnel_del_prl(t, &prl); 469 break; 470 case SIOCADDPRL: 471 case SIOCCHGPRL: 472 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 473 break; 474 } 475 dst_cache_reset(&t->dst_cache); 476 netdev_state_change(dev); 477 return err; 478} 479 480static int 481isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 482{ 483 struct ip_tunnel_prl_entry *p; 484 int ok = 1; 485 486 rcu_read_lock(); 487 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 488 if (p) { 489 if (p->flags & PRL_DEFAULT) 490 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 491 else 492 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 493 } else { 494 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 495 496 if (ipv6_addr_is_isatap(addr6) && 497 (addr6->s6_addr32[3] == iph->saddr) && 498 ipv6_chk_prefix(addr6, t->dev)) 499 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 500 else 501 ok = 0; 502 } 503 rcu_read_unlock(); 504 return ok; 505} 506 507static void ipip6_tunnel_uninit(struct net_device *dev) 508{ 509 struct ip_tunnel *tunnel = netdev_priv(dev); 510 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 511 512 if (dev == sitn->fb_tunnel_dev) { 513 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 514 } else { 515 ipip6_tunnel_unlink(sitn, tunnel); 516 ipip6_tunnel_del_prl(tunnel, NULL); 517 } 518 dst_cache_reset(&tunnel->dst_cache); 519 dev_put(dev); 520} 521 522static int ipip6_err(struct sk_buff *skb, u32 info) 523{ 524 const struct iphdr *iph = (const struct iphdr *)skb->data; 525 const int type = icmp_hdr(skb)->type; 526 const int code = icmp_hdr(skb)->code; 527 unsigned int data_len = 0; 528 struct ip_tunnel *t; 529 int sifindex; 530 int err; 531 532 switch (type) { 533 default: 534 case ICMP_PARAMETERPROB: 535 return 0; 536 537 case ICMP_DEST_UNREACH: 538 switch (code) { 539 case ICMP_SR_FAILED: 540 /* Impossible event. */ 541 return 0; 542 default: 543 /* All others are translated to HOST_UNREACH. 544 rfc2003 contains "deep thoughts" about NET_UNREACH, 545 I believe they are just ether pollution. --ANK 546 */ 547 break; 548 } 549 break; 550 case ICMP_TIME_EXCEEDED: 551 if (code != ICMP_EXC_TTL) 552 return 0; 553 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 554 break; 555 case ICMP_REDIRECT: 556 break; 557 } 558 559 err = -ENOENT; 560 561 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 562 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 563 iph->daddr, iph->saddr, sifindex); 564 if (!t) 565 goto out; 566 567 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 568 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 569 t->parms.link, iph->protocol); 570 err = 0; 571 goto out; 572 } 573 if (type == ICMP_REDIRECT) { 574 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 575 iph->protocol); 576 err = 0; 577 goto out; 578 } 579 580 err = 0; 581 if (__in6_dev_get(skb->dev) && 582 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 583 goto out; 584 585 if (t->parms.iph.daddr == 0) 586 goto out; 587 588 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 589 goto out; 590 591 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 592 t->err_count++; 593 else 594 t->err_count = 1; 595 t->err_time = jiffies; 596out: 597 return err; 598} 599 600static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 601 const struct in6_addr *v6addr) 602{ 603 __be32 v4embed = 0; 604 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 605 return true; 606 return false; 607} 608 609/* Checks if an address matches an address on the tunnel interface. 610 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 611 * Long story: 612 * This function is called after we considered the packet as spoofed 613 * in is_spoofed_6rd. 614 * We may have a router that is doing NAT for proto 41 packets 615 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 616 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 617 * function will return true, dropping the packet. 618 * But, we can still check if is spoofed against the IP 619 * addresses associated with the interface. 620 */ 621static bool only_dnatted(const struct ip_tunnel *tunnel, 622 const struct in6_addr *v6dst) 623{ 624 int prefix_len; 625 626#ifdef CONFIG_IPV6_SIT_6RD 627 prefix_len = tunnel->ip6rd.prefixlen + 32 628 - tunnel->ip6rd.relay_prefixlen; 629#else 630 prefix_len = 48; 631#endif 632 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 633} 634 635/* Returns true if a packet is spoofed */ 636static bool packet_is_spoofed(struct sk_buff *skb, 637 const struct iphdr *iph, 638 struct ip_tunnel *tunnel) 639{ 640 const struct ipv6hdr *ipv6h; 641 642 if (tunnel->dev->priv_flags & IFF_ISATAP) { 643 if (!isatap_chksrc(skb, iph, tunnel)) 644 return true; 645 646 return false; 647 } 648 649 if (tunnel->dev->flags & IFF_POINTOPOINT) 650 return false; 651 652 ipv6h = ipv6_hdr(skb); 653 654 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 655 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 656 &iph->saddr, &ipv6h->saddr, 657 &iph->daddr, &ipv6h->daddr); 658 return true; 659 } 660 661 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 662 return false; 663 664 if (only_dnatted(tunnel, &ipv6h->daddr)) 665 return false; 666 667 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 668 &iph->saddr, &ipv6h->saddr, 669 &iph->daddr, &ipv6h->daddr); 670 return true; 671} 672 673static int ipip6_rcv(struct sk_buff *skb) 674{ 675 const struct iphdr *iph = ip_hdr(skb); 676 struct ip_tunnel *tunnel; 677 int sifindex; 678 int err; 679 680 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 681 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 682 iph->saddr, iph->daddr, sifindex); 683 if (tunnel) { 684 struct pcpu_sw_netstats *tstats; 685 686 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 687 tunnel->parms.iph.protocol != 0) 688 goto out; 689 690 skb->mac_header = skb->network_header; 691 skb_reset_network_header(skb); 692 IPCB(skb)->flags = 0; 693 skb->dev = tunnel->dev; 694 695 if (packet_is_spoofed(skb, iph, tunnel)) { 696 tunnel->dev->stats.rx_errors++; 697 goto out; 698 } 699 700 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 701 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 702 goto out; 703 704 /* skb can be uncloned in iptunnel_pull_header, so 705 * old iph is no longer valid 706 */ 707 iph = (const struct iphdr *)skb_mac_header(skb); 708 err = IP_ECN_decapsulate(iph, skb); 709 if (unlikely(err)) { 710 if (log_ecn_error) 711 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 712 &iph->saddr, iph->tos); 713 if (err > 1) { 714 ++tunnel->dev->stats.rx_frame_errors; 715 ++tunnel->dev->stats.rx_errors; 716 goto out; 717 } 718 } 719 720 tstats = this_cpu_ptr(tunnel->dev->tstats); 721 u64_stats_update_begin(&tstats->syncp); 722 tstats->rx_packets++; 723 tstats->rx_bytes += skb->len; 724 u64_stats_update_end(&tstats->syncp); 725 726 netif_rx(skb); 727 728 return 0; 729 } 730 731 /* no tunnel matched, let upstream know, ipsec may handle it */ 732 return 1; 733out: 734 kfree_skb(skb); 735 return 0; 736} 737 738static const struct tnl_ptk_info ipip_tpi = { 739 /* no tunnel info required for ipip. */ 740 .proto = htons(ETH_P_IP), 741}; 742 743#if IS_ENABLED(CONFIG_MPLS) 744static const struct tnl_ptk_info mplsip_tpi = { 745 /* no tunnel info required for mplsip. */ 746 .proto = htons(ETH_P_MPLS_UC), 747}; 748#endif 749 750static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 751{ 752 const struct iphdr *iph; 753 struct ip_tunnel *tunnel; 754 int sifindex; 755 756 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 757 758 iph = ip_hdr(skb); 759 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 760 iph->saddr, iph->daddr, sifindex); 761 if (tunnel) { 762 const struct tnl_ptk_info *tpi; 763 764 if (tunnel->parms.iph.protocol != ipproto && 765 tunnel->parms.iph.protocol != 0) 766 goto drop; 767 768 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 769 goto drop; 770#if IS_ENABLED(CONFIG_MPLS) 771 if (ipproto == IPPROTO_MPLS) 772 tpi = &mplsip_tpi; 773 else 774#endif 775 tpi = &ipip_tpi; 776 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 777 goto drop; 778 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 779 } 780 781 return 1; 782 783drop: 784 kfree_skb(skb); 785 return 0; 786} 787 788static int ipip_rcv(struct sk_buff *skb) 789{ 790 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 791} 792 793#if IS_ENABLED(CONFIG_MPLS) 794static int mplsip_rcv(struct sk_buff *skb) 795{ 796 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 797} 798#endif 799 800/* 801 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 802 * stores the embedded IPv4 address in v4dst and returns true. 803 */ 804static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 805 __be32 *v4dst) 806{ 807#ifdef CONFIG_IPV6_SIT_6RD 808 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 809 tunnel->ip6rd.prefixlen)) { 810 unsigned int pbw0, pbi0; 811 int pbi1; 812 u32 d; 813 814 pbw0 = tunnel->ip6rd.prefixlen >> 5; 815 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 816 817 d = tunnel->ip6rd.relay_prefixlen < 32 ? 818 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 819 tunnel->ip6rd.relay_prefixlen : 0; 820 821 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 822 if (pbi1 > 0) 823 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 824 (32 - pbi1); 825 826 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 827 return true; 828 } 829#else 830 if (v6dst->s6_addr16[0] == htons(0x2002)) { 831 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 832 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 833 return true; 834 } 835#endif 836 return false; 837} 838 839static inline __be32 try_6rd(struct ip_tunnel *tunnel, 840 const struct in6_addr *v6dst) 841{ 842 __be32 dst = 0; 843 check_6rd(tunnel, v6dst, &dst); 844 return dst; 845} 846 847/* 848 * This function assumes it is being called from dev_queue_xmit() 849 * and that skb is filled properly by that function. 850 */ 851 852static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 853 struct net_device *dev) 854{ 855 struct ip_tunnel *tunnel = netdev_priv(dev); 856 const struct iphdr *tiph = &tunnel->parms.iph; 857 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 858 u8 tos = tunnel->parms.iph.tos; 859 __be16 df = tiph->frag_off; 860 struct rtable *rt; /* Route to the other host */ 861 struct net_device *tdev; /* Device to other host */ 862 unsigned int max_headroom; /* The extra header space needed */ 863 __be32 dst = tiph->daddr; 864 struct flowi4 fl4; 865 int mtu; 866 const struct in6_addr *addr6; 867 int addr_type; 868 u8 ttl; 869 u8 protocol = IPPROTO_IPV6; 870 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 871 872 if (tos == 1) 873 tos = ipv6_get_dsfield(iph6); 874 875 /* ISATAP (RFC4214) - must come before 6to4 */ 876 if (dev->priv_flags & IFF_ISATAP) { 877 struct neighbour *neigh = NULL; 878 bool do_tx_error = false; 879 880 if (skb_dst(skb)) 881 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 882 883 if (!neigh) { 884 net_dbg_ratelimited("nexthop == NULL\n"); 885 goto tx_error; 886 } 887 888 addr6 = (const struct in6_addr *)&neigh->primary_key; 889 addr_type = ipv6_addr_type(addr6); 890 891 if ((addr_type & IPV6_ADDR_UNICAST) && 892 ipv6_addr_is_isatap(addr6)) 893 dst = addr6->s6_addr32[3]; 894 else 895 do_tx_error = true; 896 897 neigh_release(neigh); 898 if (do_tx_error) 899 goto tx_error; 900 } 901 902 if (!dst) 903 dst = try_6rd(tunnel, &iph6->daddr); 904 905 if (!dst) { 906 struct neighbour *neigh = NULL; 907 bool do_tx_error = false; 908 909 if (skb_dst(skb)) 910 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 911 912 if (!neigh) { 913 net_dbg_ratelimited("nexthop == NULL\n"); 914 goto tx_error; 915 } 916 917 addr6 = (const struct in6_addr *)&neigh->primary_key; 918 addr_type = ipv6_addr_type(addr6); 919 920 if (addr_type == IPV6_ADDR_ANY) { 921 addr6 = &ipv6_hdr(skb)->daddr; 922 addr_type = ipv6_addr_type(addr6); 923 } 924 925 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 926 dst = addr6->s6_addr32[3]; 927 else 928 do_tx_error = true; 929 930 neigh_release(neigh); 931 if (do_tx_error) 932 goto tx_error; 933 } 934 935 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 936 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 937 0, dst, tiph->saddr, 0, 0, 938 sock_net_uid(tunnel->net, NULL)); 939 940 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 941 if (!rt) { 942 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 943 if (IS_ERR(rt)) { 944 dev->stats.tx_carrier_errors++; 945 goto tx_error_icmp; 946 } 947 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 948 } 949 950 if (rt->rt_type != RTN_UNICAST) { 951 ip_rt_put(rt); 952 dev->stats.tx_carrier_errors++; 953 goto tx_error_icmp; 954 } 955 tdev = rt->dst.dev; 956 957 if (tdev == dev) { 958 ip_rt_put(rt); 959 dev->stats.collisions++; 960 goto tx_error; 961 } 962 963 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 964 ip_rt_put(rt); 965 goto tx_error; 966 } 967 968 if (df) { 969 mtu = dst_mtu(&rt->dst) - t_hlen; 970 971 if (mtu < 68) { 972 dev->stats.collisions++; 973 ip_rt_put(rt); 974 goto tx_error; 975 } 976 977 if (mtu < IPV6_MIN_MTU) { 978 mtu = IPV6_MIN_MTU; 979 df = 0; 980 } 981 982 if (tunnel->parms.iph.daddr) 983 skb_dst_update_pmtu_no_confirm(skb, mtu); 984 985 if (skb->len > mtu && !skb_is_gso(skb)) { 986 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 987 ip_rt_put(rt); 988 goto tx_error; 989 } 990 } 991 992 if (tunnel->err_count > 0) { 993 if (time_before(jiffies, 994 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 995 tunnel->err_count--; 996 dst_link_failure(skb); 997 } else 998 tunnel->err_count = 0; 999 } 1000 1001 /* 1002 * Okay, now see if we can stuff it in the buffer as-is. 1003 */ 1004 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1005 1006 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1007 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1008 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1009 if (!new_skb) { 1010 ip_rt_put(rt); 1011 dev->stats.tx_dropped++; 1012 kfree_skb(skb); 1013 return NETDEV_TX_OK; 1014 } 1015 if (skb->sk) 1016 skb_set_owner_w(new_skb, skb->sk); 1017 dev_kfree_skb(skb); 1018 skb = new_skb; 1019 iph6 = ipv6_hdr(skb); 1020 } 1021 ttl = tiph->ttl; 1022 if (ttl == 0) 1023 ttl = iph6->hop_limit; 1024 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1025 1026 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1027 ip_rt_put(rt); 1028 goto tx_error; 1029 } 1030 1031 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1032 1033 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1034 df, !net_eq(tunnel->net, dev_net(dev))); 1035 return NETDEV_TX_OK; 1036 1037tx_error_icmp: 1038 dst_link_failure(skb); 1039tx_error: 1040 kfree_skb(skb); 1041 dev->stats.tx_errors++; 1042 return NETDEV_TX_OK; 1043} 1044 1045static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1046 struct net_device *dev, u8 ipproto) 1047{ 1048 struct ip_tunnel *tunnel = netdev_priv(dev); 1049 const struct iphdr *tiph = &tunnel->parms.iph; 1050 1051 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1052 goto tx_error; 1053 1054 skb_set_inner_ipproto(skb, ipproto); 1055 1056 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1057 return NETDEV_TX_OK; 1058tx_error: 1059 kfree_skb(skb); 1060 dev->stats.tx_errors++; 1061 return NETDEV_TX_OK; 1062} 1063 1064static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1065 struct net_device *dev) 1066{ 1067 if (!pskb_inet_may_pull(skb)) 1068 goto tx_err; 1069 1070 switch (skb->protocol) { 1071 case htons(ETH_P_IP): 1072 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1073 break; 1074 case htons(ETH_P_IPV6): 1075 ipip6_tunnel_xmit(skb, dev); 1076 break; 1077#if IS_ENABLED(CONFIG_MPLS) 1078 case htons(ETH_P_MPLS_UC): 1079 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1080 break; 1081#endif 1082 default: 1083 goto tx_err; 1084 } 1085 1086 return NETDEV_TX_OK; 1087 1088tx_err: 1089 dev->stats.tx_errors++; 1090 kfree_skb(skb); 1091 return NETDEV_TX_OK; 1092 1093} 1094 1095static void ipip6_tunnel_bind_dev(struct net_device *dev) 1096{ 1097 struct ip_tunnel *tunnel = netdev_priv(dev); 1098 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1099 struct net_device *tdev = NULL; 1100 int hlen = LL_MAX_HEADER; 1101 const struct iphdr *iph; 1102 struct flowi4 fl4; 1103 1104 iph = &tunnel->parms.iph; 1105 1106 if (iph->daddr) { 1107 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1108 NULL, 1109 iph->daddr, iph->saddr, 1110 0, 0, 1111 IPPROTO_IPV6, 1112 RT_TOS(iph->tos), 1113 tunnel->parms.link); 1114 1115 if (!IS_ERR(rt)) { 1116 tdev = rt->dst.dev; 1117 ip_rt_put(rt); 1118 } 1119 dev->flags |= IFF_POINTOPOINT; 1120 } 1121 1122 if (!tdev && tunnel->parms.link) 1123 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1124 1125 if (tdev && !netif_is_l3_master(tdev)) { 1126 int mtu; 1127 1128 mtu = tdev->mtu - t_hlen; 1129 if (mtu < IPV6_MIN_MTU) 1130 mtu = IPV6_MIN_MTU; 1131 WRITE_ONCE(dev->mtu, mtu); 1132 hlen = tdev->hard_header_len + tdev->needed_headroom; 1133 } 1134 dev->needed_headroom = t_hlen + hlen; 1135} 1136 1137static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1138 __u32 fwmark) 1139{ 1140 struct net *net = t->net; 1141 struct sit_net *sitn = net_generic(net, sit_net_id); 1142 1143 ipip6_tunnel_unlink(sitn, t); 1144 synchronize_net(); 1145 t->parms.iph.saddr = p->iph.saddr; 1146 t->parms.iph.daddr = p->iph.daddr; 1147 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1148 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1149 ipip6_tunnel_link(sitn, t); 1150 t->parms.iph.ttl = p->iph.ttl; 1151 t->parms.iph.tos = p->iph.tos; 1152 t->parms.iph.frag_off = p->iph.frag_off; 1153 if (t->parms.link != p->link || t->fwmark != fwmark) { 1154 t->parms.link = p->link; 1155 t->fwmark = fwmark; 1156 ipip6_tunnel_bind_dev(t->dev); 1157 } 1158 dst_cache_reset(&t->dst_cache); 1159 netdev_state_change(t->dev); 1160} 1161 1162#ifdef CONFIG_IPV6_SIT_6RD 1163static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1164 struct ip_tunnel_6rd *ip6rd) 1165{ 1166 struct in6_addr prefix; 1167 __be32 relay_prefix; 1168 1169 if (ip6rd->relay_prefixlen > 32 || 1170 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1171 return -EINVAL; 1172 1173 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1174 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1175 return -EINVAL; 1176 if (ip6rd->relay_prefixlen) 1177 relay_prefix = ip6rd->relay_prefix & 1178 htonl(0xffffffffUL << 1179 (32 - ip6rd->relay_prefixlen)); 1180 else 1181 relay_prefix = 0; 1182 if (relay_prefix != ip6rd->relay_prefix) 1183 return -EINVAL; 1184 1185 t->ip6rd.prefix = prefix; 1186 t->ip6rd.relay_prefix = relay_prefix; 1187 t->ip6rd.prefixlen = ip6rd->prefixlen; 1188 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1189 dst_cache_reset(&t->dst_cache); 1190 netdev_state_change(t->dev); 1191 return 0; 1192} 1193 1194static int 1195ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) 1196{ 1197 struct ip_tunnel *t = netdev_priv(dev); 1198 struct ip_tunnel_6rd ip6rd; 1199 struct ip_tunnel_parm p; 1200 1201 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1202 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1203 return -EFAULT; 1204 t = ipip6_tunnel_locate(t->net, &p, 0); 1205 } 1206 if (!t) 1207 t = netdev_priv(dev); 1208 1209 ip6rd.prefix = t->ip6rd.prefix; 1210 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1211 ip6rd.prefixlen = t->ip6rd.prefixlen; 1212 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1213 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) 1214 return -EFAULT; 1215 return 0; 1216} 1217 1218static int 1219ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1220{ 1221 struct ip_tunnel *t = netdev_priv(dev); 1222 struct ip_tunnel_6rd ip6rd; 1223 int err; 1224 1225 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1226 return -EPERM; 1227 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd))) 1228 return -EFAULT; 1229 1230 if (cmd != SIOCDEL6RD) { 1231 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1232 if (err < 0) 1233 return err; 1234 } else 1235 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1236 return 0; 1237} 1238 1239#endif /* CONFIG_IPV6_SIT_6RD */ 1240 1241static bool ipip6_valid_ip_proto(u8 ipproto) 1242{ 1243 return ipproto == IPPROTO_IPV6 || 1244 ipproto == IPPROTO_IPIP || 1245#if IS_ENABLED(CONFIG_MPLS) 1246 ipproto == IPPROTO_MPLS || 1247#endif 1248 ipproto == 0; 1249} 1250 1251static int 1252__ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) 1253{ 1254 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1255 return -EPERM; 1256 1257 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1258 return -EINVAL; 1259 if (p->iph.version != 4 || 1260 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1261 return -EINVAL; 1262 1263 if (p->iph.ttl) 1264 p->iph.frag_off |= htons(IP_DF); 1265 return 0; 1266} 1267 1268static int 1269ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) 1270{ 1271 struct ip_tunnel *t = netdev_priv(dev); 1272 1273 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1274 t = ipip6_tunnel_locate(t->net, p, 0); 1275 if (!t) 1276 t = netdev_priv(dev); 1277 memcpy(p, &t->parms, sizeof(*p)); 1278 return 0; 1279} 1280 1281static int 1282ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) 1283{ 1284 struct ip_tunnel *t = netdev_priv(dev); 1285 int err; 1286 1287 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1288 if (err) 1289 return err; 1290 1291 t = ipip6_tunnel_locate(t->net, p, 1); 1292 if (!t) 1293 return -ENOBUFS; 1294 return 0; 1295} 1296 1297static int 1298ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) 1299{ 1300 struct ip_tunnel *t = netdev_priv(dev); 1301 int err; 1302 1303 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1304 if (err) 1305 return err; 1306 1307 t = ipip6_tunnel_locate(t->net, p, 0); 1308 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1309 if (!t) 1310 return -ENOENT; 1311 } else { 1312 if (t) { 1313 if (t->dev != dev) 1314 return -EEXIST; 1315 } else { 1316 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1317 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1318 return -EINVAL; 1319 t = netdev_priv(dev); 1320 } 1321 1322 ipip6_tunnel_update(t, p, t->fwmark); 1323 } 1324 1325 return 0; 1326} 1327 1328static int 1329ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) 1330{ 1331 struct ip_tunnel *t = netdev_priv(dev); 1332 1333 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1334 return -EPERM; 1335 1336 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1337 t = ipip6_tunnel_locate(t->net, p, 0); 1338 if (!t) 1339 return -ENOENT; 1340 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1341 return -EPERM; 1342 dev = t->dev; 1343 } 1344 unregister_netdevice(dev); 1345 return 0; 1346} 1347 1348static int 1349ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 1350{ 1351 switch (cmd) { 1352 case SIOCGETTUNNEL: 1353 return ipip6_tunnel_get(dev, p); 1354 case SIOCADDTUNNEL: 1355 return ipip6_tunnel_add(dev, p); 1356 case SIOCCHGTUNNEL: 1357 return ipip6_tunnel_change(dev, p); 1358 case SIOCDELTUNNEL: 1359 return ipip6_tunnel_del(dev, p); 1360 default: 1361 return -EINVAL; 1362 } 1363} 1364 1365static int 1366ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1367{ 1368 switch (cmd) { 1369 case SIOCGETTUNNEL: 1370 case SIOCADDTUNNEL: 1371 case SIOCCHGTUNNEL: 1372 case SIOCDELTUNNEL: 1373 return ip_tunnel_ioctl(dev, ifr, cmd); 1374 case SIOCGETPRL: 1375 return ipip6_tunnel_get_prl(dev, ifr); 1376 case SIOCADDPRL: 1377 case SIOCDELPRL: 1378 case SIOCCHGPRL: 1379 return ipip6_tunnel_prl_ctl(dev, ifr, cmd); 1380#ifdef CONFIG_IPV6_SIT_6RD 1381 case SIOCGET6RD: 1382 return ipip6_tunnel_get6rd(dev, ifr); 1383 case SIOCADD6RD: 1384 case SIOCCHG6RD: 1385 case SIOCDEL6RD: 1386 return ipip6_tunnel_6rdctl(dev, ifr, cmd); 1387#endif 1388 default: 1389 return -EINVAL; 1390 } 1391} 1392 1393static const struct net_device_ops ipip6_netdev_ops = { 1394 .ndo_init = ipip6_tunnel_init, 1395 .ndo_uninit = ipip6_tunnel_uninit, 1396 .ndo_start_xmit = sit_tunnel_xmit, 1397 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1398 .ndo_get_stats64 = ip_tunnel_get_stats64, 1399 .ndo_get_iflink = ip_tunnel_get_iflink, 1400 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1401}; 1402 1403static void ipip6_dev_free(struct net_device *dev) 1404{ 1405 struct ip_tunnel *tunnel = netdev_priv(dev); 1406 1407 dst_cache_destroy(&tunnel->dst_cache); 1408 free_percpu(dev->tstats); 1409} 1410 1411#define SIT_FEATURES (NETIF_F_SG | \ 1412 NETIF_F_FRAGLIST | \ 1413 NETIF_F_HIGHDMA | \ 1414 NETIF_F_GSO_SOFTWARE | \ 1415 NETIF_F_HW_CSUM) 1416 1417static void ipip6_tunnel_setup(struct net_device *dev) 1418{ 1419 struct ip_tunnel *tunnel = netdev_priv(dev); 1420 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1421 1422 dev->netdev_ops = &ipip6_netdev_ops; 1423 dev->header_ops = &ip_tunnel_header_ops; 1424 dev->needs_free_netdev = true; 1425 dev->priv_destructor = ipip6_dev_free; 1426 1427 dev->type = ARPHRD_SIT; 1428 dev->mtu = ETH_DATA_LEN - t_hlen; 1429 dev->min_mtu = IPV6_MIN_MTU; 1430 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1431 dev->flags = IFF_NOARP; 1432 netif_keep_dst(dev); 1433 dev->addr_len = 4; 1434 dev->features |= NETIF_F_LLTX; 1435 dev->features |= SIT_FEATURES; 1436 dev->hw_features |= SIT_FEATURES; 1437} 1438 1439static int ipip6_tunnel_init(struct net_device *dev) 1440{ 1441 struct ip_tunnel *tunnel = netdev_priv(dev); 1442 int err; 1443 1444 tunnel->dev = dev; 1445 tunnel->net = dev_net(dev); 1446 strcpy(tunnel->parms.name, dev->name); 1447 1448 ipip6_tunnel_bind_dev(dev); 1449 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1450 if (!dev->tstats) 1451 return -ENOMEM; 1452 1453 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1454 if (err) { 1455 free_percpu(dev->tstats); 1456 dev->tstats = NULL; 1457 return err; 1458 } 1459 dev_hold(dev); 1460 return 0; 1461} 1462 1463static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1464{ 1465 struct ip_tunnel *tunnel = netdev_priv(dev); 1466 struct iphdr *iph = &tunnel->parms.iph; 1467 struct net *net = dev_net(dev); 1468 struct sit_net *sitn = net_generic(net, sit_net_id); 1469 1470 iph->version = 4; 1471 iph->protocol = IPPROTO_IPV6; 1472 iph->ihl = 5; 1473 iph->ttl = 64; 1474 1475 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1476} 1477 1478static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1479 struct netlink_ext_ack *extack) 1480{ 1481 u8 proto; 1482 1483 if (!data || !data[IFLA_IPTUN_PROTO]) 1484 return 0; 1485 1486 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1487 if (!ipip6_valid_ip_proto(proto)) 1488 return -EINVAL; 1489 1490 return 0; 1491} 1492 1493static void ipip6_netlink_parms(struct nlattr *data[], 1494 struct ip_tunnel_parm *parms, 1495 __u32 *fwmark) 1496{ 1497 memset(parms, 0, sizeof(*parms)); 1498 1499 parms->iph.version = 4; 1500 parms->iph.protocol = IPPROTO_IPV6; 1501 parms->iph.ihl = 5; 1502 parms->iph.ttl = 64; 1503 1504 if (!data) 1505 return; 1506 1507 if (data[IFLA_IPTUN_LINK]) 1508 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1509 1510 if (data[IFLA_IPTUN_LOCAL]) 1511 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1512 1513 if (data[IFLA_IPTUN_REMOTE]) 1514 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1515 1516 if (data[IFLA_IPTUN_TTL]) { 1517 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1518 if (parms->iph.ttl) 1519 parms->iph.frag_off = htons(IP_DF); 1520 } 1521 1522 if (data[IFLA_IPTUN_TOS]) 1523 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1524 1525 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1526 parms->iph.frag_off = htons(IP_DF); 1527 1528 if (data[IFLA_IPTUN_FLAGS]) 1529 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1530 1531 if (data[IFLA_IPTUN_PROTO]) 1532 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1533 1534 if (data[IFLA_IPTUN_FWMARK]) 1535 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1536} 1537 1538/* This function returns true when ENCAP attributes are present in the nl msg */ 1539static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1540 struct ip_tunnel_encap *ipencap) 1541{ 1542 bool ret = false; 1543 1544 memset(ipencap, 0, sizeof(*ipencap)); 1545 1546 if (!data) 1547 return ret; 1548 1549 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1550 ret = true; 1551 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1552 } 1553 1554 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1555 ret = true; 1556 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1557 } 1558 1559 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1560 ret = true; 1561 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1562 } 1563 1564 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1565 ret = true; 1566 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1567 } 1568 1569 return ret; 1570} 1571 1572#ifdef CONFIG_IPV6_SIT_6RD 1573/* This function returns true when 6RD attributes are present in the nl msg */ 1574static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1575 struct ip_tunnel_6rd *ip6rd) 1576{ 1577 bool ret = false; 1578 memset(ip6rd, 0, sizeof(*ip6rd)); 1579 1580 if (!data) 1581 return ret; 1582 1583 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1584 ret = true; 1585 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1586 } 1587 1588 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1589 ret = true; 1590 ip6rd->relay_prefix = 1591 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1592 } 1593 1594 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1595 ret = true; 1596 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1597 } 1598 1599 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1600 ret = true; 1601 ip6rd->relay_prefixlen = 1602 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1603 } 1604 1605 return ret; 1606} 1607#endif 1608 1609static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1610 struct nlattr *tb[], struct nlattr *data[], 1611 struct netlink_ext_ack *extack) 1612{ 1613 struct net *net = dev_net(dev); 1614 struct ip_tunnel *nt; 1615 struct ip_tunnel_encap ipencap; 1616#ifdef CONFIG_IPV6_SIT_6RD 1617 struct ip_tunnel_6rd ip6rd; 1618#endif 1619 int err; 1620 1621 nt = netdev_priv(dev); 1622 1623 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1624 err = ip_tunnel_encap_setup(nt, &ipencap); 1625 if (err < 0) 1626 return err; 1627 } 1628 1629 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1630 1631 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1632 return -EEXIST; 1633 1634 err = ipip6_tunnel_create(dev); 1635 if (err < 0) 1636 return err; 1637 1638 if (tb[IFLA_MTU]) { 1639 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1640 1641 if (mtu >= IPV6_MIN_MTU && 1642 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1643 dev->mtu = mtu; 1644 } 1645 1646#ifdef CONFIG_IPV6_SIT_6RD 1647 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1648 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1649 if (err < 0) 1650 unregister_netdevice_queue(dev, NULL); 1651 } 1652#endif 1653 1654 return err; 1655} 1656 1657static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1658 struct nlattr *data[], 1659 struct netlink_ext_ack *extack) 1660{ 1661 struct ip_tunnel *t = netdev_priv(dev); 1662 struct ip_tunnel_parm p; 1663 struct ip_tunnel_encap ipencap; 1664 struct net *net = t->net; 1665 struct sit_net *sitn = net_generic(net, sit_net_id); 1666#ifdef CONFIG_IPV6_SIT_6RD 1667 struct ip_tunnel_6rd ip6rd; 1668#endif 1669 __u32 fwmark = t->fwmark; 1670 int err; 1671 1672 if (dev == sitn->fb_tunnel_dev) 1673 return -EINVAL; 1674 1675 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1676 err = ip_tunnel_encap_setup(t, &ipencap); 1677 if (err < 0) 1678 return err; 1679 } 1680 1681 ipip6_netlink_parms(data, &p, &fwmark); 1682 1683 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1684 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1685 return -EINVAL; 1686 1687 t = ipip6_tunnel_locate(net, &p, 0); 1688 1689 if (t) { 1690 if (t->dev != dev) 1691 return -EEXIST; 1692 } else 1693 t = netdev_priv(dev); 1694 1695 ipip6_tunnel_update(t, &p, fwmark); 1696 1697#ifdef CONFIG_IPV6_SIT_6RD 1698 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1699 return ipip6_tunnel_update_6rd(t, &ip6rd); 1700#endif 1701 1702 return 0; 1703} 1704 1705static size_t ipip6_get_size(const struct net_device *dev) 1706{ 1707 return 1708 /* IFLA_IPTUN_LINK */ 1709 nla_total_size(4) + 1710 /* IFLA_IPTUN_LOCAL */ 1711 nla_total_size(4) + 1712 /* IFLA_IPTUN_REMOTE */ 1713 nla_total_size(4) + 1714 /* IFLA_IPTUN_TTL */ 1715 nla_total_size(1) + 1716 /* IFLA_IPTUN_TOS */ 1717 nla_total_size(1) + 1718 /* IFLA_IPTUN_PMTUDISC */ 1719 nla_total_size(1) + 1720 /* IFLA_IPTUN_FLAGS */ 1721 nla_total_size(2) + 1722 /* IFLA_IPTUN_PROTO */ 1723 nla_total_size(1) + 1724#ifdef CONFIG_IPV6_SIT_6RD 1725 /* IFLA_IPTUN_6RD_PREFIX */ 1726 nla_total_size(sizeof(struct in6_addr)) + 1727 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1728 nla_total_size(4) + 1729 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1730 nla_total_size(2) + 1731 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1732 nla_total_size(2) + 1733#endif 1734 /* IFLA_IPTUN_ENCAP_TYPE */ 1735 nla_total_size(2) + 1736 /* IFLA_IPTUN_ENCAP_FLAGS */ 1737 nla_total_size(2) + 1738 /* IFLA_IPTUN_ENCAP_SPORT */ 1739 nla_total_size(2) + 1740 /* IFLA_IPTUN_ENCAP_DPORT */ 1741 nla_total_size(2) + 1742 /* IFLA_IPTUN_FWMARK */ 1743 nla_total_size(4) + 1744 0; 1745} 1746 1747static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1748{ 1749 struct ip_tunnel *tunnel = netdev_priv(dev); 1750 struct ip_tunnel_parm *parm = &tunnel->parms; 1751 1752 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1753 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1754 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1755 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1756 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1757 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1758 !!(parm->iph.frag_off & htons(IP_DF))) || 1759 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1760 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1761 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1762 goto nla_put_failure; 1763 1764#ifdef CONFIG_IPV6_SIT_6RD 1765 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1766 &tunnel->ip6rd.prefix) || 1767 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1768 tunnel->ip6rd.relay_prefix) || 1769 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1770 tunnel->ip6rd.prefixlen) || 1771 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1772 tunnel->ip6rd.relay_prefixlen)) 1773 goto nla_put_failure; 1774#endif 1775 1776 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1777 tunnel->encap.type) || 1778 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1779 tunnel->encap.sport) || 1780 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1781 tunnel->encap.dport) || 1782 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1783 tunnel->encap.flags)) 1784 goto nla_put_failure; 1785 1786 return 0; 1787 1788nla_put_failure: 1789 return -EMSGSIZE; 1790} 1791 1792static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1793 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1794 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1795 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1796 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1797 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1798 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1799 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1800 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1801#ifdef CONFIG_IPV6_SIT_6RD 1802 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1803 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1804 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1805 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1806#endif 1807 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1808 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1809 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1810 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1811 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1812}; 1813 1814static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1815{ 1816 struct net *net = dev_net(dev); 1817 struct sit_net *sitn = net_generic(net, sit_net_id); 1818 1819 if (dev != sitn->fb_tunnel_dev) 1820 unregister_netdevice_queue(dev, head); 1821} 1822 1823static struct rtnl_link_ops sit_link_ops __read_mostly = { 1824 .kind = "sit", 1825 .maxtype = IFLA_IPTUN_MAX, 1826 .policy = ipip6_policy, 1827 .priv_size = sizeof(struct ip_tunnel), 1828 .setup = ipip6_tunnel_setup, 1829 .validate = ipip6_validate, 1830 .newlink = ipip6_newlink, 1831 .changelink = ipip6_changelink, 1832 .get_size = ipip6_get_size, 1833 .fill_info = ipip6_fill_info, 1834 .dellink = ipip6_dellink, 1835 .get_link_net = ip_tunnel_get_link_net, 1836}; 1837 1838static struct xfrm_tunnel sit_handler __read_mostly = { 1839 .handler = ipip6_rcv, 1840 .err_handler = ipip6_err, 1841 .priority = 1, 1842}; 1843 1844static struct xfrm_tunnel ipip_handler __read_mostly = { 1845 .handler = ipip_rcv, 1846 .err_handler = ipip6_err, 1847 .priority = 2, 1848}; 1849 1850#if IS_ENABLED(CONFIG_MPLS) 1851static struct xfrm_tunnel mplsip_handler __read_mostly = { 1852 .handler = mplsip_rcv, 1853 .err_handler = ipip6_err, 1854 .priority = 2, 1855}; 1856#endif 1857 1858static void __net_exit sit_destroy_tunnels(struct net *net, 1859 struct list_head *head) 1860{ 1861 struct sit_net *sitn = net_generic(net, sit_net_id); 1862 struct net_device *dev, *aux; 1863 int prio; 1864 1865 for_each_netdev_safe(net, dev, aux) 1866 if (dev->rtnl_link_ops == &sit_link_ops) 1867 unregister_netdevice_queue(dev, head); 1868 1869 for (prio = 0; prio < 4; prio++) { 1870 int h; 1871 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1872 struct ip_tunnel *t; 1873 1874 t = rtnl_dereference(sitn->tunnels[prio][h]); 1875 while (t) { 1876 /* If dev is in the same netns, it has already 1877 * been added to the list by the previous loop. 1878 */ 1879 if (!net_eq(dev_net(t->dev), net)) 1880 unregister_netdevice_queue(t->dev, 1881 head); 1882 t = rtnl_dereference(t->next); 1883 } 1884 } 1885 } 1886} 1887 1888static int __net_init sit_init_net(struct net *net) 1889{ 1890 struct sit_net *sitn = net_generic(net, sit_net_id); 1891 struct ip_tunnel *t; 1892 int err; 1893 1894 sitn->tunnels[0] = sitn->tunnels_wc; 1895 sitn->tunnels[1] = sitn->tunnels_l; 1896 sitn->tunnels[2] = sitn->tunnels_r; 1897 sitn->tunnels[3] = sitn->tunnels_r_l; 1898 1899 if (!net_has_fallback_tunnels(net)) 1900 return 0; 1901 1902 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1903 NET_NAME_UNKNOWN, 1904 ipip6_tunnel_setup); 1905 if (!sitn->fb_tunnel_dev) { 1906 err = -ENOMEM; 1907 goto err_alloc_dev; 1908 } 1909 dev_net_set(sitn->fb_tunnel_dev, net); 1910 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1911 /* FB netdevice is special: we have one, and only one per netns. 1912 * Allowing to move it to another netns is clearly unsafe. 1913 */ 1914 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1915 1916 err = register_netdev(sitn->fb_tunnel_dev); 1917 if (err) 1918 goto err_reg_dev; 1919 1920 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1921 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1922 1923 t = netdev_priv(sitn->fb_tunnel_dev); 1924 1925 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1926 return 0; 1927 1928err_reg_dev: 1929 free_netdev(sitn->fb_tunnel_dev); 1930err_alloc_dev: 1931 return err; 1932} 1933 1934static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1935{ 1936 LIST_HEAD(list); 1937 struct net *net; 1938 1939 rtnl_lock(); 1940 list_for_each_entry(net, net_list, exit_list) 1941 sit_destroy_tunnels(net, &list); 1942 1943 unregister_netdevice_many(&list); 1944 rtnl_unlock(); 1945} 1946 1947static struct pernet_operations sit_net_ops = { 1948 .init = sit_init_net, 1949 .exit_batch = sit_exit_batch_net, 1950 .id = &sit_net_id, 1951 .size = sizeof(struct sit_net), 1952}; 1953 1954static void __exit sit_cleanup(void) 1955{ 1956 rtnl_link_unregister(&sit_link_ops); 1957 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1958 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1959#if IS_ENABLED(CONFIG_MPLS) 1960 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1961#endif 1962 1963 unregister_pernet_device(&sit_net_ops); 1964 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1965} 1966 1967static int __init sit_init(void) 1968{ 1969 int err; 1970 1971 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1972 1973 err = register_pernet_device(&sit_net_ops); 1974 if (err < 0) 1975 return err; 1976 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1977 if (err < 0) { 1978 pr_info("%s: can't register ip6ip4\n", __func__); 1979 goto xfrm_tunnel_failed; 1980 } 1981 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1982 if (err < 0) { 1983 pr_info("%s: can't register ip4ip4\n", __func__); 1984 goto xfrm_tunnel4_failed; 1985 } 1986#if IS_ENABLED(CONFIG_MPLS) 1987 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1988 if (err < 0) { 1989 pr_info("%s: can't register mplsip\n", __func__); 1990 goto xfrm_tunnel_mpls_failed; 1991 } 1992#endif 1993 err = rtnl_link_register(&sit_link_ops); 1994 if (err < 0) 1995 goto rtnl_link_failed; 1996 1997out: 1998 return err; 1999 2000rtnl_link_failed: 2001#if IS_ENABLED(CONFIG_MPLS) 2002 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 2003xfrm_tunnel_mpls_failed: 2004#endif 2005 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 2006xfrm_tunnel4_failed: 2007 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 2008xfrm_tunnel_failed: 2009 unregister_pernet_device(&sit_net_ops); 2010 goto out; 2011} 2012 2013module_init(sit_init); 2014module_exit(sit_cleanup); 2015MODULE_LICENSE("GPL"); 2016MODULE_ALIAS_RTNL_LINK("sit"); 2017MODULE_ALIAS_NETDEV("sit0"); 2018