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 64 static bool log_ecn_error = true; 65 module_param(log_ecn_error, bool, 0644); 66 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 67 68 static int ipip6_tunnel_init(struct net_device *dev); 69 static void ipip6_tunnel_setup(struct net_device *dev); 70 static void ipip6_dev_free(struct net_device *dev); 71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 72 __be32 *v4dst); 73 static struct rtnl_link_ops sit_link_ops __read_mostly; 74 75 static unsigned int sit_net_id __read_mostly; 76 struct 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 86 static 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 */ 96 static 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 } 134 135 static 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 } 153 154 static 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 } 159 160 static 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 } 174 175 static 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 } 182 183 static 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 } 199 200 static 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 __dev_addr_set(dev, &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; 223 224 out: 225 return err; 226 } 227 228 static 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 if (!parms->name[0]) 275 strcpy(parms->name, dev->name); 276 277 return nt; 278 279 failed_free: 280 free_netdev(dev); 281 failed: 282 return NULL; 283 } 284 285 #define for_each_prl_rcu(start) \ 286 for (prl = rcu_dereference(start); \ 287 prl; \ 288 prl = rcu_dereference(prl->next)) 289 290 static struct ip_tunnel_prl_entry * 291 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 292 { 293 struct ip_tunnel_prl_entry *prl; 294 295 for_each_prl_rcu(t->prl) 296 if (prl->addr == addr) 297 break; 298 return prl; 299 300 } 301 302 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a) 303 { 304 struct ip_tunnel *t = netdev_priv(dev); 305 struct ip_tunnel_prl kprl, *kp; 306 struct ip_tunnel_prl_entry *prl; 307 unsigned int cmax, c = 0, ca, len; 308 int ret = 0; 309 310 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 311 return -EINVAL; 312 313 if (copy_from_user(&kprl, a, sizeof(kprl))) 314 return -EFAULT; 315 cmax = kprl.datalen / sizeof(kprl); 316 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 317 cmax = 1; 318 319 /* For simple GET or for root users, 320 * we try harder to allocate. 321 */ 322 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 323 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) : 324 NULL; 325 326 ca = min(t->prl_count, cmax); 327 328 if (!kp) { 329 /* We don't try hard to allocate much memory for 330 * non-root users. 331 * For root users, retry allocating enough memory for 332 * the answer. 333 */ 334 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT | 335 __GFP_NOWARN); 336 if (!kp) { 337 ret = -ENOMEM; 338 goto out; 339 } 340 } 341 342 rcu_read_lock(); 343 for_each_prl_rcu(t->prl) { 344 if (c >= cmax) 345 break; 346 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 347 continue; 348 kp[c].addr = prl->addr; 349 kp[c].flags = prl->flags; 350 c++; 351 if (kprl.addr != htonl(INADDR_ANY)) 352 break; 353 } 354 355 rcu_read_unlock(); 356 357 len = sizeof(*kp) * c; 358 ret = 0; 359 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 360 ret = -EFAULT; 361 362 kfree(kp); 363 out: 364 return ret; 365 } 366 367 static int 368 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 369 { 370 struct ip_tunnel_prl_entry *p; 371 int err = 0; 372 373 if (a->addr == htonl(INADDR_ANY)) 374 return -EINVAL; 375 376 ASSERT_RTNL(); 377 378 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 379 if (p->addr == a->addr) { 380 if (chg) { 381 p->flags = a->flags; 382 goto out; 383 } 384 err = -EEXIST; 385 goto out; 386 } 387 } 388 389 if (chg) { 390 err = -ENXIO; 391 goto out; 392 } 393 394 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 395 if (!p) { 396 err = -ENOBUFS; 397 goto out; 398 } 399 400 p->next = t->prl; 401 p->addr = a->addr; 402 p->flags = a->flags; 403 t->prl_count++; 404 rcu_assign_pointer(t->prl, p); 405 out: 406 return err; 407 } 408 409 static void prl_list_destroy_rcu(struct rcu_head *head) 410 { 411 struct ip_tunnel_prl_entry *p, *n; 412 413 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 414 do { 415 n = rcu_dereference_protected(p->next, 1); 416 kfree(p); 417 p = n; 418 } while (p); 419 } 420 421 static int 422 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 423 { 424 struct ip_tunnel_prl_entry *x; 425 struct ip_tunnel_prl_entry __rcu **p; 426 int err = 0; 427 428 ASSERT_RTNL(); 429 430 if (a && a->addr != htonl(INADDR_ANY)) { 431 for (p = &t->prl; 432 (x = rtnl_dereference(*p)) != NULL; 433 p = &x->next) { 434 if (x->addr == a->addr) { 435 *p = x->next; 436 kfree_rcu(x, rcu_head); 437 t->prl_count--; 438 goto out; 439 } 440 } 441 err = -ENXIO; 442 } else { 443 x = rtnl_dereference(t->prl); 444 if (x) { 445 t->prl_count = 0; 446 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 447 t->prl = NULL; 448 } 449 } 450 out: 451 return err; 452 } 453 454 static int ipip6_tunnel_prl_ctl(struct net_device *dev, 455 struct ip_tunnel_prl __user *data, int cmd) 456 { 457 struct ip_tunnel *t = netdev_priv(dev); 458 struct ip_tunnel_prl prl; 459 int err; 460 461 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 462 return -EPERM; 463 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 464 return -EINVAL; 465 466 if (copy_from_user(&prl, data, sizeof(prl))) 467 return -EFAULT; 468 469 switch (cmd) { 470 case SIOCDELPRL: 471 err = ipip6_tunnel_del_prl(t, &prl); 472 break; 473 case SIOCADDPRL: 474 case SIOCCHGPRL: 475 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 476 break; 477 } 478 dst_cache_reset(&t->dst_cache); 479 netdev_state_change(dev); 480 return err; 481 } 482 483 static int 484 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 485 { 486 struct ip_tunnel_prl_entry *p; 487 int ok = 1; 488 489 rcu_read_lock(); 490 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 491 if (p) { 492 if (p->flags & PRL_DEFAULT) 493 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 494 else 495 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 496 } else { 497 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 498 499 if (ipv6_addr_is_isatap(addr6) && 500 (addr6->s6_addr32[3] == iph->saddr) && 501 ipv6_chk_prefix(addr6, t->dev)) 502 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 503 else 504 ok = 0; 505 } 506 rcu_read_unlock(); 507 return ok; 508 } 509 510 static void ipip6_tunnel_uninit(struct net_device *dev) 511 { 512 struct ip_tunnel *tunnel = netdev_priv(dev); 513 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 514 515 if (dev == sitn->fb_tunnel_dev) { 516 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 517 } else { 518 ipip6_tunnel_unlink(sitn, tunnel); 519 ipip6_tunnel_del_prl(tunnel, NULL); 520 } 521 dst_cache_reset(&tunnel->dst_cache); 522 netdev_put(dev, &tunnel->dev_tracker); 523 } 524 525 static int ipip6_err(struct sk_buff *skb, u32 info) 526 { 527 const struct iphdr *iph = (const struct iphdr *)skb->data; 528 const int type = icmp_hdr(skb)->type; 529 const int code = icmp_hdr(skb)->code; 530 unsigned int data_len = 0; 531 struct ip_tunnel *t; 532 int sifindex; 533 int err; 534 535 switch (type) { 536 default: 537 case ICMP_PARAMETERPROB: 538 return 0; 539 540 case ICMP_DEST_UNREACH: 541 switch (code) { 542 case ICMP_SR_FAILED: 543 /* Impossible event. */ 544 return 0; 545 default: 546 /* All others are translated to HOST_UNREACH. 547 rfc2003 contains "deep thoughts" about NET_UNREACH, 548 I believe they are just ether pollution. --ANK 549 */ 550 break; 551 } 552 break; 553 case ICMP_TIME_EXCEEDED: 554 if (code != ICMP_EXC_TTL) 555 return 0; 556 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 557 break; 558 case ICMP_REDIRECT: 559 break; 560 } 561 562 err = -ENOENT; 563 564 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 565 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 566 iph->daddr, iph->saddr, sifindex); 567 if (!t) 568 goto out; 569 570 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 571 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 572 t->parms.link, iph->protocol); 573 err = 0; 574 goto out; 575 } 576 if (type == ICMP_REDIRECT) { 577 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 578 iph->protocol); 579 err = 0; 580 goto out; 581 } 582 583 err = 0; 584 if (__in6_dev_get(skb->dev) && 585 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 586 goto out; 587 588 if (t->parms.iph.daddr == 0) 589 goto out; 590 591 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 592 goto out; 593 594 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 595 t->err_count++; 596 else 597 t->err_count = 1; 598 t->err_time = jiffies; 599 out: 600 return err; 601 } 602 603 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 604 const struct in6_addr *v6addr) 605 { 606 __be32 v4embed = 0; 607 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 608 return true; 609 return false; 610 } 611 612 /* Checks if an address matches an address on the tunnel interface. 613 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 614 * Long story: 615 * This function is called after we considered the packet as spoofed 616 * in is_spoofed_6rd. 617 * We may have a router that is doing NAT for proto 41 packets 618 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 619 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 620 * function will return true, dropping the packet. 621 * But, we can still check if is spoofed against the IP 622 * addresses associated with the interface. 623 */ 624 static bool only_dnatted(const struct ip_tunnel *tunnel, 625 const struct in6_addr *v6dst) 626 { 627 int prefix_len; 628 629 #ifdef CONFIG_IPV6_SIT_6RD 630 prefix_len = tunnel->ip6rd.prefixlen + 32 631 - tunnel->ip6rd.relay_prefixlen; 632 #else 633 prefix_len = 48; 634 #endif 635 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 636 } 637 638 /* Returns true if a packet is spoofed */ 639 static bool packet_is_spoofed(struct sk_buff *skb, 640 const struct iphdr *iph, 641 struct ip_tunnel *tunnel) 642 { 643 const struct ipv6hdr *ipv6h; 644 645 if (tunnel->dev->priv_flags & IFF_ISATAP) { 646 if (!isatap_chksrc(skb, iph, tunnel)) 647 return true; 648 649 return false; 650 } 651 652 if (tunnel->dev->flags & IFF_POINTOPOINT) 653 return false; 654 655 ipv6h = ipv6_hdr(skb); 656 657 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 658 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 659 &iph->saddr, &ipv6h->saddr, 660 &iph->daddr, &ipv6h->daddr); 661 return true; 662 } 663 664 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 665 return false; 666 667 if (only_dnatted(tunnel, &ipv6h->daddr)) 668 return false; 669 670 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 671 &iph->saddr, &ipv6h->saddr, 672 &iph->daddr, &ipv6h->daddr); 673 return true; 674 } 675 676 static int ipip6_rcv(struct sk_buff *skb) 677 { 678 const struct iphdr *iph = ip_hdr(skb); 679 struct ip_tunnel *tunnel; 680 int sifindex; 681 int err; 682 683 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 684 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 685 iph->saddr, iph->daddr, sifindex); 686 if (tunnel) { 687 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 688 tunnel->parms.iph.protocol != 0) 689 goto out; 690 691 skb->mac_header = skb->network_header; 692 skb_reset_network_header(skb); 693 IPCB(skb)->flags = 0; 694 skb->dev = tunnel->dev; 695 696 if (packet_is_spoofed(skb, iph, tunnel)) { 697 tunnel->dev->stats.rx_errors++; 698 goto out; 699 } 700 701 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 702 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 703 goto out; 704 705 /* skb can be uncloned in iptunnel_pull_header, so 706 * old iph is no longer valid 707 */ 708 iph = (const struct iphdr *)skb_mac_header(skb); 709 skb_reset_mac_header(skb); 710 711 err = IP_ECN_decapsulate(iph, skb); 712 if (unlikely(err)) { 713 if (log_ecn_error) 714 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 715 &iph->saddr, iph->tos); 716 if (err > 1) { 717 ++tunnel->dev->stats.rx_frame_errors; 718 ++tunnel->dev->stats.rx_errors; 719 goto out; 720 } 721 } 722 723 dev_sw_netstats_rx_add(tunnel->dev, skb->len); 724 725 netif_rx(skb); 726 727 return 0; 728 } 729 730 /* no tunnel matched, let upstream know, ipsec may handle it */ 731 return 1; 732 out: 733 kfree_skb(skb); 734 return 0; 735 } 736 737 static const struct tnl_ptk_info ipip_tpi = { 738 /* no tunnel info required for ipip. */ 739 .proto = htons(ETH_P_IP), 740 }; 741 742 #if IS_ENABLED(CONFIG_MPLS) 743 static const struct tnl_ptk_info mplsip_tpi = { 744 /* no tunnel info required for mplsip. */ 745 .proto = htons(ETH_P_MPLS_UC), 746 }; 747 #endif 748 749 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 750 { 751 const struct iphdr *iph; 752 struct ip_tunnel *tunnel; 753 int sifindex; 754 755 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 756 757 iph = ip_hdr(skb); 758 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 759 iph->saddr, iph->daddr, sifindex); 760 if (tunnel) { 761 const struct tnl_ptk_info *tpi; 762 763 if (tunnel->parms.iph.protocol != ipproto && 764 tunnel->parms.iph.protocol != 0) 765 goto drop; 766 767 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 768 goto drop; 769 #if IS_ENABLED(CONFIG_MPLS) 770 if (ipproto == IPPROTO_MPLS) 771 tpi = &mplsip_tpi; 772 else 773 #endif 774 tpi = &ipip_tpi; 775 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 776 goto drop; 777 skb_reset_mac_header(skb); 778 779 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 780 } 781 782 return 1; 783 784 drop: 785 kfree_skb(skb); 786 return 0; 787 } 788 789 static int ipip_rcv(struct sk_buff *skb) 790 { 791 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 792 } 793 794 #if IS_ENABLED(CONFIG_MPLS) 795 static int mplsip_rcv(struct sk_buff *skb) 796 { 797 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 798 } 799 #endif 800 801 /* 802 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 803 * stores the embedded IPv4 address in v4dst and returns true. 804 */ 805 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 806 __be32 *v4dst) 807 { 808 #ifdef CONFIG_IPV6_SIT_6RD 809 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 810 tunnel->ip6rd.prefixlen)) { 811 unsigned int pbw0, pbi0; 812 int pbi1; 813 u32 d; 814 815 pbw0 = tunnel->ip6rd.prefixlen >> 5; 816 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 817 818 d = tunnel->ip6rd.relay_prefixlen < 32 ? 819 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 820 tunnel->ip6rd.relay_prefixlen : 0; 821 822 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 823 if (pbi1 > 0) 824 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 825 (32 - pbi1); 826 827 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 828 return true; 829 } 830 #else 831 if (v6dst->s6_addr16[0] == htons(0x2002)) { 832 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 833 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 834 return true; 835 } 836 #endif 837 return false; 838 } 839 840 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 841 const struct in6_addr *v6dst) 842 { 843 __be32 dst = 0; 844 check_6rd(tunnel, v6dst, &dst); 845 return dst; 846 } 847 848 /* 849 * This function assumes it is being called from dev_queue_xmit() 850 * and that skb is filled properly by that function. 851 */ 852 853 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 854 struct net_device *dev) 855 { 856 struct ip_tunnel *tunnel = netdev_priv(dev); 857 const struct iphdr *tiph = &tunnel->parms.iph; 858 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 859 u8 tos = tunnel->parms.iph.tos; 860 __be16 df = tiph->frag_off; 861 struct rtable *rt; /* Route to the other host */ 862 struct net_device *tdev; /* Device to other host */ 863 unsigned int max_headroom; /* The extra header space needed */ 864 __be32 dst = tiph->daddr; 865 struct flowi4 fl4; 866 int mtu; 867 const struct in6_addr *addr6; 868 int addr_type; 869 u8 ttl; 870 u8 protocol = IPPROTO_IPV6; 871 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 872 873 if (tos == 1) 874 tos = ipv6_get_dsfield(iph6); 875 876 /* ISATAP (RFC4214) - must come before 6to4 */ 877 if (dev->priv_flags & IFF_ISATAP) { 878 struct neighbour *neigh = NULL; 879 bool do_tx_error = false; 880 881 if (skb_dst(skb)) 882 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 883 884 if (!neigh) { 885 net_dbg_ratelimited("nexthop == NULL\n"); 886 goto tx_error; 887 } 888 889 addr6 = (const struct in6_addr *)&neigh->primary_key; 890 addr_type = ipv6_addr_type(addr6); 891 892 if ((addr_type & IPV6_ADDR_UNICAST) && 893 ipv6_addr_is_isatap(addr6)) 894 dst = addr6->s6_addr32[3]; 895 else 896 do_tx_error = true; 897 898 neigh_release(neigh); 899 if (do_tx_error) 900 goto tx_error; 901 } 902 903 if (!dst) 904 dst = try_6rd(tunnel, &iph6->daddr); 905 906 if (!dst) { 907 struct neighbour *neigh = NULL; 908 bool do_tx_error = false; 909 910 if (skb_dst(skb)) 911 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 912 913 if (!neigh) { 914 net_dbg_ratelimited("nexthop == NULL\n"); 915 goto tx_error; 916 } 917 918 addr6 = (const struct in6_addr *)&neigh->primary_key; 919 addr_type = ipv6_addr_type(addr6); 920 921 if (addr_type == IPV6_ADDR_ANY) { 922 addr6 = &ipv6_hdr(skb)->daddr; 923 addr_type = ipv6_addr_type(addr6); 924 } 925 926 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 927 dst = addr6->s6_addr32[3]; 928 else 929 do_tx_error = true; 930 931 neigh_release(neigh); 932 if (do_tx_error) 933 goto tx_error; 934 } 935 936 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 937 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 938 0, dst, tiph->saddr, 0, 0, 939 sock_net_uid(tunnel->net, NULL)); 940 941 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 942 if (!rt) { 943 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 944 if (IS_ERR(rt)) { 945 dev->stats.tx_carrier_errors++; 946 goto tx_error_icmp; 947 } 948 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 949 } 950 951 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 952 ip_rt_put(rt); 953 dev->stats.tx_carrier_errors++; 954 goto tx_error_icmp; 955 } 956 tdev = rt->dst.dev; 957 958 if (tdev == dev) { 959 ip_rt_put(rt); 960 dev->stats.collisions++; 961 goto tx_error; 962 } 963 964 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 965 ip_rt_put(rt); 966 goto tx_error; 967 } 968 969 if (df) { 970 mtu = dst_mtu(&rt->dst) - t_hlen; 971 972 if (mtu < IPV4_MIN_MTU) { 973 dev->stats.collisions++; 974 ip_rt_put(rt); 975 goto tx_error; 976 } 977 978 if (mtu < IPV6_MIN_MTU) { 979 mtu = IPV6_MIN_MTU; 980 df = 0; 981 } 982 983 if (tunnel->parms.iph.daddr) 984 skb_dst_update_pmtu_no_confirm(skb, mtu); 985 986 if (skb->len > mtu && !skb_is_gso(skb)) { 987 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 988 ip_rt_put(rt); 989 goto tx_error; 990 } 991 } 992 993 if (tunnel->err_count > 0) { 994 if (time_before(jiffies, 995 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 996 tunnel->err_count--; 997 dst_link_failure(skb); 998 } else 999 tunnel->err_count = 0; 1000 } 1001 1002 /* 1003 * Okay, now see if we can stuff it in the buffer as-is. 1004 */ 1005 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1006 1007 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1008 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1009 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1010 if (!new_skb) { 1011 ip_rt_put(rt); 1012 dev->stats.tx_dropped++; 1013 kfree_skb(skb); 1014 return NETDEV_TX_OK; 1015 } 1016 if (skb->sk) 1017 skb_set_owner_w(new_skb, skb->sk); 1018 dev_kfree_skb(skb); 1019 skb = new_skb; 1020 iph6 = ipv6_hdr(skb); 1021 } 1022 ttl = tiph->ttl; 1023 if (ttl == 0) 1024 ttl = iph6->hop_limit; 1025 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1026 1027 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1028 ip_rt_put(rt); 1029 goto tx_error; 1030 } 1031 1032 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1033 1034 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1035 df, !net_eq(tunnel->net, dev_net(dev))); 1036 return NETDEV_TX_OK; 1037 1038 tx_error_icmp: 1039 dst_link_failure(skb); 1040 tx_error: 1041 kfree_skb(skb); 1042 dev->stats.tx_errors++; 1043 return NETDEV_TX_OK; 1044 } 1045 1046 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1047 struct net_device *dev, u8 ipproto) 1048 { 1049 struct ip_tunnel *tunnel = netdev_priv(dev); 1050 const struct iphdr *tiph = &tunnel->parms.iph; 1051 1052 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1053 goto tx_error; 1054 1055 skb_set_inner_ipproto(skb, ipproto); 1056 1057 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1058 return NETDEV_TX_OK; 1059 tx_error: 1060 kfree_skb(skb); 1061 dev->stats.tx_errors++; 1062 return NETDEV_TX_OK; 1063 } 1064 1065 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1066 struct net_device *dev) 1067 { 1068 if (!pskb_inet_may_pull(skb)) 1069 goto tx_err; 1070 1071 switch (skb->protocol) { 1072 case htons(ETH_P_IP): 1073 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1074 break; 1075 case htons(ETH_P_IPV6): 1076 ipip6_tunnel_xmit(skb, dev); 1077 break; 1078 #if IS_ENABLED(CONFIG_MPLS) 1079 case htons(ETH_P_MPLS_UC): 1080 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1081 break; 1082 #endif 1083 default: 1084 goto tx_err; 1085 } 1086 1087 return NETDEV_TX_OK; 1088 1089 tx_err: 1090 dev->stats.tx_errors++; 1091 kfree_skb(skb); 1092 return NETDEV_TX_OK; 1093 1094 } 1095 1096 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1097 { 1098 struct net_device *tdev = NULL; 1099 struct ip_tunnel *tunnel; 1100 const struct iphdr *iph; 1101 struct flowi4 fl4; 1102 1103 tunnel = netdev_priv(dev); 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 t_hlen = tunnel->hlen + sizeof(struct iphdr); 1127 1128 dev->mtu = tdev->mtu - t_hlen; 1129 if (dev->mtu < IPV6_MIN_MTU) 1130 dev->mtu = IPV6_MIN_MTU; 1131 } 1132 } 1133 1134 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1135 __u32 fwmark) 1136 { 1137 struct net *net = t->net; 1138 struct sit_net *sitn = net_generic(net, sit_net_id); 1139 1140 ipip6_tunnel_unlink(sitn, t); 1141 synchronize_net(); 1142 t->parms.iph.saddr = p->iph.saddr; 1143 t->parms.iph.daddr = p->iph.daddr; 1144 __dev_addr_set(t->dev, &p->iph.saddr, 4); 1145 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1146 ipip6_tunnel_link(sitn, t); 1147 t->parms.iph.ttl = p->iph.ttl; 1148 t->parms.iph.tos = p->iph.tos; 1149 t->parms.iph.frag_off = p->iph.frag_off; 1150 if (t->parms.link != p->link || t->fwmark != fwmark) { 1151 t->parms.link = p->link; 1152 t->fwmark = fwmark; 1153 ipip6_tunnel_bind_dev(t->dev); 1154 } 1155 dst_cache_reset(&t->dst_cache); 1156 netdev_state_change(t->dev); 1157 } 1158 1159 #ifdef CONFIG_IPV6_SIT_6RD 1160 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1161 struct ip_tunnel_6rd *ip6rd) 1162 { 1163 struct in6_addr prefix; 1164 __be32 relay_prefix; 1165 1166 if (ip6rd->relay_prefixlen > 32 || 1167 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1168 return -EINVAL; 1169 1170 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1171 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1172 return -EINVAL; 1173 if (ip6rd->relay_prefixlen) 1174 relay_prefix = ip6rd->relay_prefix & 1175 htonl(0xffffffffUL << 1176 (32 - ip6rd->relay_prefixlen)); 1177 else 1178 relay_prefix = 0; 1179 if (relay_prefix != ip6rd->relay_prefix) 1180 return -EINVAL; 1181 1182 t->ip6rd.prefix = prefix; 1183 t->ip6rd.relay_prefix = relay_prefix; 1184 t->ip6rd.prefixlen = ip6rd->prefixlen; 1185 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1186 dst_cache_reset(&t->dst_cache); 1187 netdev_state_change(t->dev); 1188 return 0; 1189 } 1190 1191 static int 1192 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data) 1193 { 1194 struct ip_tunnel *t = netdev_priv(dev); 1195 struct ip_tunnel_6rd ip6rd; 1196 struct ip_tunnel_parm p; 1197 1198 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1199 if (copy_from_user(&p, data, sizeof(p))) 1200 return -EFAULT; 1201 t = ipip6_tunnel_locate(t->net, &p, 0); 1202 } 1203 if (!t) 1204 t = netdev_priv(dev); 1205 1206 ip6rd.prefix = t->ip6rd.prefix; 1207 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1208 ip6rd.prefixlen = t->ip6rd.prefixlen; 1209 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1210 if (copy_to_user(data, &ip6rd, sizeof(ip6rd))) 1211 return -EFAULT; 1212 return 0; 1213 } 1214 1215 static int 1216 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data, 1217 int cmd) 1218 { 1219 struct ip_tunnel *t = netdev_priv(dev); 1220 struct ip_tunnel_6rd ip6rd; 1221 int err; 1222 1223 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1224 return -EPERM; 1225 if (copy_from_user(&ip6rd, data, sizeof(ip6rd))) 1226 return -EFAULT; 1227 1228 if (cmd != SIOCDEL6RD) { 1229 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1230 if (err < 0) 1231 return err; 1232 } else 1233 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1234 return 0; 1235 } 1236 1237 #endif /* CONFIG_IPV6_SIT_6RD */ 1238 1239 static bool ipip6_valid_ip_proto(u8 ipproto) 1240 { 1241 return ipproto == IPPROTO_IPV6 || 1242 ipproto == IPPROTO_IPIP || 1243 #if IS_ENABLED(CONFIG_MPLS) 1244 ipproto == IPPROTO_MPLS || 1245 #endif 1246 ipproto == 0; 1247 } 1248 1249 static int 1250 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) 1251 { 1252 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1253 return -EPERM; 1254 1255 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1256 return -EINVAL; 1257 if (p->iph.version != 4 || 1258 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1259 return -EINVAL; 1260 1261 if (p->iph.ttl) 1262 p->iph.frag_off |= htons(IP_DF); 1263 return 0; 1264 } 1265 1266 static int 1267 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) 1268 { 1269 struct ip_tunnel *t = netdev_priv(dev); 1270 1271 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1272 t = ipip6_tunnel_locate(t->net, p, 0); 1273 if (!t) 1274 t = netdev_priv(dev); 1275 memcpy(p, &t->parms, sizeof(*p)); 1276 return 0; 1277 } 1278 1279 static int 1280 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) 1281 { 1282 struct ip_tunnel *t = netdev_priv(dev); 1283 int err; 1284 1285 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1286 if (err) 1287 return err; 1288 1289 t = ipip6_tunnel_locate(t->net, p, 1); 1290 if (!t) 1291 return -ENOBUFS; 1292 return 0; 1293 } 1294 1295 static int 1296 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) 1297 { 1298 struct ip_tunnel *t = netdev_priv(dev); 1299 int err; 1300 1301 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1302 if (err) 1303 return err; 1304 1305 t = ipip6_tunnel_locate(t->net, p, 0); 1306 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1307 if (!t) 1308 return -ENOENT; 1309 } else { 1310 if (t) { 1311 if (t->dev != dev) 1312 return -EEXIST; 1313 } else { 1314 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1315 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1316 return -EINVAL; 1317 t = netdev_priv(dev); 1318 } 1319 1320 ipip6_tunnel_update(t, p, t->fwmark); 1321 } 1322 1323 return 0; 1324 } 1325 1326 static int 1327 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) 1328 { 1329 struct ip_tunnel *t = netdev_priv(dev); 1330 1331 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1332 return -EPERM; 1333 1334 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1335 t = ipip6_tunnel_locate(t->net, p, 0); 1336 if (!t) 1337 return -ENOENT; 1338 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1339 return -EPERM; 1340 dev = t->dev; 1341 } 1342 unregister_netdevice(dev); 1343 return 0; 1344 } 1345 1346 static int 1347 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 1348 { 1349 switch (cmd) { 1350 case SIOCGETTUNNEL: 1351 return ipip6_tunnel_get(dev, p); 1352 case SIOCADDTUNNEL: 1353 return ipip6_tunnel_add(dev, p); 1354 case SIOCCHGTUNNEL: 1355 return ipip6_tunnel_change(dev, p); 1356 case SIOCDELTUNNEL: 1357 return ipip6_tunnel_del(dev, p); 1358 default: 1359 return -EINVAL; 1360 } 1361 } 1362 1363 static int 1364 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1365 void __user *data, int cmd) 1366 { 1367 switch (cmd) { 1368 case SIOCGETTUNNEL: 1369 case SIOCADDTUNNEL: 1370 case SIOCCHGTUNNEL: 1371 case SIOCDELTUNNEL: 1372 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd); 1373 case SIOCGETPRL: 1374 return ipip6_tunnel_get_prl(dev, data); 1375 case SIOCADDPRL: 1376 case SIOCDELPRL: 1377 case SIOCCHGPRL: 1378 return ipip6_tunnel_prl_ctl(dev, data, cmd); 1379 #ifdef CONFIG_IPV6_SIT_6RD 1380 case SIOCGET6RD: 1381 return ipip6_tunnel_get6rd(dev, data); 1382 case SIOCADD6RD: 1383 case SIOCCHG6RD: 1384 case SIOCDEL6RD: 1385 return ipip6_tunnel_6rdctl(dev, data, cmd); 1386 #endif 1387 default: 1388 return -EINVAL; 1389 } 1390 } 1391 1392 static const struct net_device_ops ipip6_netdev_ops = { 1393 .ndo_init = ipip6_tunnel_init, 1394 .ndo_uninit = ipip6_tunnel_uninit, 1395 .ndo_start_xmit = sit_tunnel_xmit, 1396 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate, 1397 .ndo_get_stats64 = dev_get_tstats64, 1398 .ndo_get_iflink = ip_tunnel_get_iflink, 1399 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1400 }; 1401 1402 static void ipip6_dev_free(struct net_device *dev) 1403 { 1404 struct ip_tunnel *tunnel = netdev_priv(dev); 1405 1406 dst_cache_destroy(&tunnel->dst_cache); 1407 free_percpu(dev->tstats); 1408 } 1409 1410 #define SIT_FEATURES (NETIF_F_SG | \ 1411 NETIF_F_FRAGLIST | \ 1412 NETIF_F_HIGHDMA | \ 1413 NETIF_F_GSO_SOFTWARE | \ 1414 NETIF_F_HW_CSUM) 1415 1416 static void ipip6_tunnel_setup(struct net_device *dev) 1417 { 1418 struct ip_tunnel *tunnel = netdev_priv(dev); 1419 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1420 1421 dev->netdev_ops = &ipip6_netdev_ops; 1422 dev->header_ops = &ip_tunnel_header_ops; 1423 dev->needs_free_netdev = true; 1424 dev->priv_destructor = ipip6_dev_free; 1425 1426 dev->type = ARPHRD_SIT; 1427 dev->mtu = ETH_DATA_LEN - t_hlen; 1428 dev->min_mtu = IPV6_MIN_MTU; 1429 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1430 dev->flags = IFF_NOARP; 1431 netif_keep_dst(dev); 1432 dev->addr_len = 4; 1433 dev->features |= NETIF_F_LLTX; 1434 dev->features |= SIT_FEATURES; 1435 dev->hw_features |= SIT_FEATURES; 1436 } 1437 1438 static int ipip6_tunnel_init(struct net_device *dev) 1439 { 1440 struct ip_tunnel *tunnel = netdev_priv(dev); 1441 int err; 1442 1443 tunnel->dev = dev; 1444 tunnel->net = dev_net(dev); 1445 strcpy(tunnel->parms.name, dev->name); 1446 1447 ipip6_tunnel_bind_dev(dev); 1448 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1449 if (!dev->tstats) 1450 return -ENOMEM; 1451 1452 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1453 if (err) { 1454 free_percpu(dev->tstats); 1455 dev->tstats = NULL; 1456 return err; 1457 } 1458 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1459 return 0; 1460 } 1461 1462 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1463 { 1464 struct ip_tunnel *tunnel = netdev_priv(dev); 1465 struct iphdr *iph = &tunnel->parms.iph; 1466 struct net *net = dev_net(dev); 1467 struct sit_net *sitn = net_generic(net, sit_net_id); 1468 1469 iph->version = 4; 1470 iph->protocol = IPPROTO_IPV6; 1471 iph->ihl = 5; 1472 iph->ttl = 64; 1473 1474 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1475 } 1476 1477 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1478 struct netlink_ext_ack *extack) 1479 { 1480 u8 proto; 1481 1482 if (!data || !data[IFLA_IPTUN_PROTO]) 1483 return 0; 1484 1485 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1486 if (!ipip6_valid_ip_proto(proto)) 1487 return -EINVAL; 1488 1489 return 0; 1490 } 1491 1492 static void ipip6_netlink_parms(struct nlattr *data[], 1493 struct ip_tunnel_parm *parms, 1494 __u32 *fwmark) 1495 { 1496 memset(parms, 0, sizeof(*parms)); 1497 1498 parms->iph.version = 4; 1499 parms->iph.protocol = IPPROTO_IPV6; 1500 parms->iph.ihl = 5; 1501 parms->iph.ttl = 64; 1502 1503 if (!data) 1504 return; 1505 1506 if (data[IFLA_IPTUN_LINK]) 1507 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1508 1509 if (data[IFLA_IPTUN_LOCAL]) 1510 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1511 1512 if (data[IFLA_IPTUN_REMOTE]) 1513 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1514 1515 if (data[IFLA_IPTUN_TTL]) { 1516 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1517 if (parms->iph.ttl) 1518 parms->iph.frag_off = htons(IP_DF); 1519 } 1520 1521 if (data[IFLA_IPTUN_TOS]) 1522 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1523 1524 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1525 parms->iph.frag_off = htons(IP_DF); 1526 1527 if (data[IFLA_IPTUN_FLAGS]) 1528 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1529 1530 if (data[IFLA_IPTUN_PROTO]) 1531 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1532 1533 if (data[IFLA_IPTUN_FWMARK]) 1534 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1535 } 1536 1537 /* This function returns true when ENCAP attributes are present in the nl msg */ 1538 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1539 struct ip_tunnel_encap *ipencap) 1540 { 1541 bool ret = false; 1542 1543 memset(ipencap, 0, sizeof(*ipencap)); 1544 1545 if (!data) 1546 return ret; 1547 1548 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1549 ret = true; 1550 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1551 } 1552 1553 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1554 ret = true; 1555 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1556 } 1557 1558 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1559 ret = true; 1560 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1561 } 1562 1563 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1564 ret = true; 1565 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1566 } 1567 1568 return ret; 1569 } 1570 1571 #ifdef CONFIG_IPV6_SIT_6RD 1572 /* This function returns true when 6RD attributes are present in the nl msg */ 1573 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1574 struct ip_tunnel_6rd *ip6rd) 1575 { 1576 bool ret = false; 1577 memset(ip6rd, 0, sizeof(*ip6rd)); 1578 1579 if (!data) 1580 return ret; 1581 1582 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1583 ret = true; 1584 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1585 } 1586 1587 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1588 ret = true; 1589 ip6rd->relay_prefix = 1590 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1591 } 1592 1593 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1594 ret = true; 1595 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1596 } 1597 1598 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1599 ret = true; 1600 ip6rd->relay_prefixlen = 1601 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1602 } 1603 1604 return ret; 1605 } 1606 #endif 1607 1608 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1609 struct nlattr *tb[], struct nlattr *data[], 1610 struct netlink_ext_ack *extack) 1611 { 1612 struct net *net = dev_net(dev); 1613 struct ip_tunnel *nt; 1614 struct ip_tunnel_encap ipencap; 1615 #ifdef CONFIG_IPV6_SIT_6RD 1616 struct ip_tunnel_6rd ip6rd; 1617 #endif 1618 int err; 1619 1620 nt = netdev_priv(dev); 1621 1622 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1623 err = ip_tunnel_encap_setup(nt, &ipencap); 1624 if (err < 0) 1625 return err; 1626 } 1627 1628 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1629 1630 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1631 return -EEXIST; 1632 1633 err = ipip6_tunnel_create(dev); 1634 if (err < 0) 1635 return err; 1636 1637 if (tb[IFLA_MTU]) { 1638 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1639 1640 if (mtu >= IPV6_MIN_MTU && 1641 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1642 dev->mtu = mtu; 1643 } 1644 1645 #ifdef CONFIG_IPV6_SIT_6RD 1646 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1647 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1648 if (err < 0) 1649 unregister_netdevice_queue(dev, NULL); 1650 } 1651 #endif 1652 1653 return err; 1654 } 1655 1656 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1657 struct nlattr *data[], 1658 struct netlink_ext_ack *extack) 1659 { 1660 struct ip_tunnel *t = netdev_priv(dev); 1661 struct ip_tunnel_parm p; 1662 struct ip_tunnel_encap ipencap; 1663 struct net *net = t->net; 1664 struct sit_net *sitn = net_generic(net, sit_net_id); 1665 #ifdef CONFIG_IPV6_SIT_6RD 1666 struct ip_tunnel_6rd ip6rd; 1667 #endif 1668 __u32 fwmark = t->fwmark; 1669 int err; 1670 1671 if (dev == sitn->fb_tunnel_dev) 1672 return -EINVAL; 1673 1674 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1675 err = ip_tunnel_encap_setup(t, &ipencap); 1676 if (err < 0) 1677 return err; 1678 } 1679 1680 ipip6_netlink_parms(data, &p, &fwmark); 1681 1682 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1683 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1684 return -EINVAL; 1685 1686 t = ipip6_tunnel_locate(net, &p, 0); 1687 1688 if (t) { 1689 if (t->dev != dev) 1690 return -EEXIST; 1691 } else 1692 t = netdev_priv(dev); 1693 1694 ipip6_tunnel_update(t, &p, fwmark); 1695 1696 #ifdef CONFIG_IPV6_SIT_6RD 1697 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1698 return ipip6_tunnel_update_6rd(t, &ip6rd); 1699 #endif 1700 1701 return 0; 1702 } 1703 1704 static size_t ipip6_get_size(const struct net_device *dev) 1705 { 1706 return 1707 /* IFLA_IPTUN_LINK */ 1708 nla_total_size(4) + 1709 /* IFLA_IPTUN_LOCAL */ 1710 nla_total_size(4) + 1711 /* IFLA_IPTUN_REMOTE */ 1712 nla_total_size(4) + 1713 /* IFLA_IPTUN_TTL */ 1714 nla_total_size(1) + 1715 /* IFLA_IPTUN_TOS */ 1716 nla_total_size(1) + 1717 /* IFLA_IPTUN_PMTUDISC */ 1718 nla_total_size(1) + 1719 /* IFLA_IPTUN_FLAGS */ 1720 nla_total_size(2) + 1721 /* IFLA_IPTUN_PROTO */ 1722 nla_total_size(1) + 1723 #ifdef CONFIG_IPV6_SIT_6RD 1724 /* IFLA_IPTUN_6RD_PREFIX */ 1725 nla_total_size(sizeof(struct in6_addr)) + 1726 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1727 nla_total_size(4) + 1728 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1729 nla_total_size(2) + 1730 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1731 nla_total_size(2) + 1732 #endif 1733 /* IFLA_IPTUN_ENCAP_TYPE */ 1734 nla_total_size(2) + 1735 /* IFLA_IPTUN_ENCAP_FLAGS */ 1736 nla_total_size(2) + 1737 /* IFLA_IPTUN_ENCAP_SPORT */ 1738 nla_total_size(2) + 1739 /* IFLA_IPTUN_ENCAP_DPORT */ 1740 nla_total_size(2) + 1741 /* IFLA_IPTUN_FWMARK */ 1742 nla_total_size(4) + 1743 0; 1744 } 1745 1746 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1747 { 1748 struct ip_tunnel *tunnel = netdev_priv(dev); 1749 struct ip_tunnel_parm *parm = &tunnel->parms; 1750 1751 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1752 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1753 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1754 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1755 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1756 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1757 !!(parm->iph.frag_off & htons(IP_DF))) || 1758 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1759 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1760 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1761 goto nla_put_failure; 1762 1763 #ifdef CONFIG_IPV6_SIT_6RD 1764 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1765 &tunnel->ip6rd.prefix) || 1766 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1767 tunnel->ip6rd.relay_prefix) || 1768 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1769 tunnel->ip6rd.prefixlen) || 1770 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1771 tunnel->ip6rd.relay_prefixlen)) 1772 goto nla_put_failure; 1773 #endif 1774 1775 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1776 tunnel->encap.type) || 1777 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1778 tunnel->encap.sport) || 1779 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1780 tunnel->encap.dport) || 1781 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1782 tunnel->encap.flags)) 1783 goto nla_put_failure; 1784 1785 return 0; 1786 1787 nla_put_failure: 1788 return -EMSGSIZE; 1789 } 1790 1791 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1792 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1793 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1794 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1795 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1796 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1797 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1798 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1799 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1800 #ifdef CONFIG_IPV6_SIT_6RD 1801 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1802 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1803 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1804 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1805 #endif 1806 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1807 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1808 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1809 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1810 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1811 }; 1812 1813 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1814 { 1815 struct net *net = dev_net(dev); 1816 struct sit_net *sitn = net_generic(net, sit_net_id); 1817 1818 if (dev != sitn->fb_tunnel_dev) 1819 unregister_netdevice_queue(dev, head); 1820 } 1821 1822 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1823 .kind = "sit", 1824 .maxtype = IFLA_IPTUN_MAX, 1825 .policy = ipip6_policy, 1826 .priv_size = sizeof(struct ip_tunnel), 1827 .setup = ipip6_tunnel_setup, 1828 .validate = ipip6_validate, 1829 .newlink = ipip6_newlink, 1830 .changelink = ipip6_changelink, 1831 .get_size = ipip6_get_size, 1832 .fill_info = ipip6_fill_info, 1833 .dellink = ipip6_dellink, 1834 .get_link_net = ip_tunnel_get_link_net, 1835 }; 1836 1837 static struct xfrm_tunnel sit_handler __read_mostly = { 1838 .handler = ipip6_rcv, 1839 .err_handler = ipip6_err, 1840 .priority = 1, 1841 }; 1842 1843 static struct xfrm_tunnel ipip_handler __read_mostly = { 1844 .handler = ipip_rcv, 1845 .err_handler = ipip6_err, 1846 .priority = 2, 1847 }; 1848 1849 #if IS_ENABLED(CONFIG_MPLS) 1850 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1851 .handler = mplsip_rcv, 1852 .err_handler = ipip6_err, 1853 .priority = 2, 1854 }; 1855 #endif 1856 1857 static void __net_exit sit_destroy_tunnels(struct net *net, 1858 struct list_head *head) 1859 { 1860 struct sit_net *sitn = net_generic(net, sit_net_id); 1861 struct net_device *dev, *aux; 1862 int prio; 1863 1864 for_each_netdev_safe(net, dev, aux) 1865 if (dev->rtnl_link_ops == &sit_link_ops) 1866 unregister_netdevice_queue(dev, head); 1867 1868 for (prio = 0; prio < 4; prio++) { 1869 int h; 1870 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1871 struct ip_tunnel *t; 1872 1873 t = rtnl_dereference(sitn->tunnels[prio][h]); 1874 while (t) { 1875 /* If dev is in the same netns, it has already 1876 * been added to the list by the previous loop. 1877 */ 1878 if (!net_eq(dev_net(t->dev), net)) 1879 unregister_netdevice_queue(t->dev, 1880 head); 1881 t = rtnl_dereference(t->next); 1882 } 1883 } 1884 } 1885 } 1886 1887 static int __net_init sit_init_net(struct net *net) 1888 { 1889 struct sit_net *sitn = net_generic(net, sit_net_id); 1890 struct ip_tunnel *t; 1891 int err; 1892 1893 sitn->tunnels[0] = sitn->tunnels_wc; 1894 sitn->tunnels[1] = sitn->tunnels_l; 1895 sitn->tunnels[2] = sitn->tunnels_r; 1896 sitn->tunnels[3] = sitn->tunnels_r_l; 1897 1898 if (!net_has_fallback_tunnels(net)) 1899 return 0; 1900 1901 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1902 NET_NAME_UNKNOWN, 1903 ipip6_tunnel_setup); 1904 if (!sitn->fb_tunnel_dev) { 1905 err = -ENOMEM; 1906 goto err_alloc_dev; 1907 } 1908 dev_net_set(sitn->fb_tunnel_dev, net); 1909 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1910 /* FB netdevice is special: we have one, and only one per netns. 1911 * Allowing to move it to another netns is clearly unsafe. 1912 */ 1913 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1914 1915 err = register_netdev(sitn->fb_tunnel_dev); 1916 if (err) 1917 goto err_reg_dev; 1918 1919 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1920 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1921 1922 t = netdev_priv(sitn->fb_tunnel_dev); 1923 1924 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1925 return 0; 1926 1927 err_reg_dev: 1928 free_netdev(sitn->fb_tunnel_dev); 1929 err_alloc_dev: 1930 return err; 1931 } 1932 1933 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1934 { 1935 LIST_HEAD(list); 1936 struct net *net; 1937 1938 rtnl_lock(); 1939 list_for_each_entry(net, net_list, exit_list) 1940 sit_destroy_tunnels(net, &list); 1941 1942 unregister_netdevice_many(&list); 1943 rtnl_unlock(); 1944 } 1945 1946 static struct pernet_operations sit_net_ops = { 1947 .init = sit_init_net, 1948 .exit_batch = sit_exit_batch_net, 1949 .id = &sit_net_id, 1950 .size = sizeof(struct sit_net), 1951 }; 1952 1953 static void __exit sit_cleanup(void) 1954 { 1955 rtnl_link_unregister(&sit_link_ops); 1956 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1957 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1958 #if IS_ENABLED(CONFIG_MPLS) 1959 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1960 #endif 1961 1962 unregister_pernet_device(&sit_net_ops); 1963 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1964 } 1965 1966 static int __init sit_init(void) 1967 { 1968 int err; 1969 1970 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1971 1972 err = register_pernet_device(&sit_net_ops); 1973 if (err < 0) 1974 return err; 1975 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1976 if (err < 0) { 1977 pr_info("%s: can't register ip6ip4\n", __func__); 1978 goto xfrm_tunnel_failed; 1979 } 1980 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1981 if (err < 0) { 1982 pr_info("%s: can't register ip4ip4\n", __func__); 1983 goto xfrm_tunnel4_failed; 1984 } 1985 #if IS_ENABLED(CONFIG_MPLS) 1986 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1987 if (err < 0) { 1988 pr_info("%s: can't register mplsip\n", __func__); 1989 goto xfrm_tunnel_mpls_failed; 1990 } 1991 #endif 1992 err = rtnl_link_register(&sit_link_ops); 1993 if (err < 0) 1994 goto rtnl_link_failed; 1995 1996 out: 1997 return err; 1998 1999 rtnl_link_failed: 2000 #if IS_ENABLED(CONFIG_MPLS) 2001 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 2002 xfrm_tunnel_mpls_failed: 2003 #endif 2004 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 2005 xfrm_tunnel4_failed: 2006 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 2007 xfrm_tunnel_failed: 2008 unregister_pernet_device(&sit_net_ops); 2009 goto out; 2010 } 2011 2012 module_init(sit_init); 2013 module_exit(sit_cleanup); 2014 MODULE_LICENSE("GPL"); 2015 MODULE_ALIAS_RTNL_LINK("sit"); 2016 MODULE_ALIAS_NETDEV("sit0"); 2017