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 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; 223 224 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 return nt; 275 276 failed_free: 277 free_netdev(dev); 278 failed: 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)) 286 287 static 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 } 298 299 static 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 rcu_read_lock(); 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); 335 if (!kp) { 336 ret = -ENOMEM; 337 goto out; 338 } 339 } 340 341 c = 0; 342 for_each_prl_rcu(t->prl) { 343 if (c >= cmax) 344 break; 345 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 346 continue; 347 kp[c].addr = prl->addr; 348 kp[c].flags = prl->flags; 349 c++; 350 if (kprl.addr != htonl(INADDR_ANY)) 351 break; 352 } 353 out: 354 rcu_read_unlock(); 355 356 len = sizeof(*kp) * c; 357 ret = 0; 358 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 359 ret = -EFAULT; 360 361 kfree(kp); 362 363 return ret; 364 } 365 366 static int 367 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 368 { 369 struct ip_tunnel_prl_entry *p; 370 int err = 0; 371 372 if (a->addr == htonl(INADDR_ANY)) 373 return -EINVAL; 374 375 ASSERT_RTNL(); 376 377 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 378 if (p->addr == a->addr) { 379 if (chg) { 380 p->flags = a->flags; 381 goto out; 382 } 383 err = -EEXIST; 384 goto out; 385 } 386 } 387 388 if (chg) { 389 err = -ENXIO; 390 goto out; 391 } 392 393 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 394 if (!p) { 395 err = -ENOBUFS; 396 goto out; 397 } 398 399 p->next = t->prl; 400 p->addr = a->addr; 401 p->flags = a->flags; 402 t->prl_count++; 403 rcu_assign_pointer(t->prl, p); 404 out: 405 return err; 406 } 407 408 static void prl_list_destroy_rcu(struct rcu_head *head) 409 { 410 struct ip_tunnel_prl_entry *p, *n; 411 412 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 413 do { 414 n = rcu_dereference_protected(p->next, 1); 415 kfree(p); 416 p = n; 417 } while (p); 418 } 419 420 static int 421 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 422 { 423 struct ip_tunnel_prl_entry *x; 424 struct ip_tunnel_prl_entry __rcu **p; 425 int err = 0; 426 427 ASSERT_RTNL(); 428 429 if (a && a->addr != htonl(INADDR_ANY)) { 430 for (p = &t->prl; 431 (x = rtnl_dereference(*p)) != NULL; 432 p = &x->next) { 433 if (x->addr == a->addr) { 434 *p = x->next; 435 kfree_rcu(x, rcu_head); 436 t->prl_count--; 437 goto out; 438 } 439 } 440 err = -ENXIO; 441 } else { 442 x = rtnl_dereference(t->prl); 443 if (x) { 444 t->prl_count = 0; 445 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 446 t->prl = NULL; 447 } 448 } 449 out: 450 return err; 451 } 452 453 static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, 454 int cmd) 455 { 456 struct ip_tunnel *t = netdev_priv(dev); 457 struct ip_tunnel_prl prl; 458 int err; 459 460 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 461 return -EPERM; 462 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 463 return -EINVAL; 464 465 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 466 return -EFAULT; 467 468 switch (cmd) { 469 case SIOCDELPRL: 470 err = ipip6_tunnel_del_prl(t, &prl); 471 break; 472 case SIOCADDPRL: 473 case SIOCCHGPRL: 474 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 475 break; 476 } 477 dst_cache_reset(&t->dst_cache); 478 netdev_state_change(dev); 479 return err; 480 } 481 482 static int 483 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 484 { 485 struct ip_tunnel_prl_entry *p; 486 int ok = 1; 487 488 rcu_read_lock(); 489 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 490 if (p) { 491 if (p->flags & PRL_DEFAULT) 492 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 493 else 494 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 495 } else { 496 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 497 498 if (ipv6_addr_is_isatap(addr6) && 499 (addr6->s6_addr32[3] == iph->saddr) && 500 ipv6_chk_prefix(addr6, t->dev)) 501 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 502 else 503 ok = 0; 504 } 505 rcu_read_unlock(); 506 return ok; 507 } 508 509 static void ipip6_tunnel_uninit(struct net_device *dev) 510 { 511 struct ip_tunnel *tunnel = netdev_priv(dev); 512 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 513 514 if (dev == sitn->fb_tunnel_dev) { 515 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 516 } else { 517 ipip6_tunnel_unlink(sitn, tunnel); 518 ipip6_tunnel_del_prl(tunnel, NULL); 519 } 520 dst_cache_reset(&tunnel->dst_cache); 521 dev_put(dev); 522 } 523 524 static int ipip6_err(struct sk_buff *skb, u32 info) 525 { 526 const struct iphdr *iph = (const struct iphdr *)skb->data; 527 const int type = icmp_hdr(skb)->type; 528 const int code = icmp_hdr(skb)->code; 529 unsigned int data_len = 0; 530 struct ip_tunnel *t; 531 int sifindex; 532 int err; 533 534 switch (type) { 535 default: 536 case ICMP_PARAMETERPROB: 537 return 0; 538 539 case ICMP_DEST_UNREACH: 540 switch (code) { 541 case ICMP_SR_FAILED: 542 /* Impossible event. */ 543 return 0; 544 default: 545 /* All others are translated to HOST_UNREACH. 546 rfc2003 contains "deep thoughts" about NET_UNREACH, 547 I believe they are just ether pollution. --ANK 548 */ 549 break; 550 } 551 break; 552 case ICMP_TIME_EXCEEDED: 553 if (code != ICMP_EXC_TTL) 554 return 0; 555 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 556 break; 557 case ICMP_REDIRECT: 558 break; 559 } 560 561 err = -ENOENT; 562 563 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 564 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 565 iph->daddr, iph->saddr, sifindex); 566 if (!t) 567 goto out; 568 569 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 570 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 571 t->parms.link, iph->protocol); 572 err = 0; 573 goto out; 574 } 575 if (type == ICMP_REDIRECT) { 576 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 577 iph->protocol); 578 err = 0; 579 goto out; 580 } 581 582 err = 0; 583 if (__in6_dev_get(skb->dev) && 584 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 585 goto out; 586 587 if (t->parms.iph.daddr == 0) 588 goto out; 589 590 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 591 goto out; 592 593 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 594 t->err_count++; 595 else 596 t->err_count = 1; 597 t->err_time = jiffies; 598 out: 599 return err; 600 } 601 602 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 603 const struct in6_addr *v6addr) 604 { 605 __be32 v4embed = 0; 606 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 607 return true; 608 return false; 609 } 610 611 /* Checks if an address matches an address on the tunnel interface. 612 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 613 * Long story: 614 * This function is called after we considered the packet as spoofed 615 * in is_spoofed_6rd. 616 * We may have a router that is doing NAT for proto 41 packets 617 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 618 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 619 * function will return true, dropping the packet. 620 * But, we can still check if is spoofed against the IP 621 * addresses associated with the interface. 622 */ 623 static bool only_dnatted(const struct ip_tunnel *tunnel, 624 const struct in6_addr *v6dst) 625 { 626 int prefix_len; 627 628 #ifdef CONFIG_IPV6_SIT_6RD 629 prefix_len = tunnel->ip6rd.prefixlen + 32 630 - tunnel->ip6rd.relay_prefixlen; 631 #else 632 prefix_len = 48; 633 #endif 634 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 635 } 636 637 /* Returns true if a packet is spoofed */ 638 static bool packet_is_spoofed(struct sk_buff *skb, 639 const struct iphdr *iph, 640 struct ip_tunnel *tunnel) 641 { 642 const struct ipv6hdr *ipv6h; 643 644 if (tunnel->dev->priv_flags & IFF_ISATAP) { 645 if (!isatap_chksrc(skb, iph, tunnel)) 646 return true; 647 648 return false; 649 } 650 651 if (tunnel->dev->flags & IFF_POINTOPOINT) 652 return false; 653 654 ipv6h = ipv6_hdr(skb); 655 656 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 657 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 658 &iph->saddr, &ipv6h->saddr, 659 &iph->daddr, &ipv6h->daddr); 660 return true; 661 } 662 663 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 664 return false; 665 666 if (only_dnatted(tunnel, &ipv6h->daddr)) 667 return false; 668 669 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 670 &iph->saddr, &ipv6h->saddr, 671 &iph->daddr, &ipv6h->daddr); 672 return true; 673 } 674 675 static int ipip6_rcv(struct sk_buff *skb) 676 { 677 const struct iphdr *iph = ip_hdr(skb); 678 struct ip_tunnel *tunnel; 679 int sifindex; 680 int err; 681 682 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 683 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 684 iph->saddr, iph->daddr, sifindex); 685 if (tunnel) { 686 struct pcpu_sw_netstats *tstats; 687 688 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 689 tunnel->parms.iph.protocol != 0) 690 goto out; 691 692 skb->mac_header = skb->network_header; 693 skb_reset_network_header(skb); 694 IPCB(skb)->flags = 0; 695 skb->dev = tunnel->dev; 696 697 if (packet_is_spoofed(skb, iph, tunnel)) { 698 tunnel->dev->stats.rx_errors++; 699 goto out; 700 } 701 702 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 703 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 704 goto out; 705 706 /* skb can be uncloned in iptunnel_pull_header, so 707 * old iph is no longer valid 708 */ 709 iph = (const struct iphdr *)skb_mac_header(skb); 710 err = IP_ECN_decapsulate(iph, skb); 711 if (unlikely(err)) { 712 if (log_ecn_error) 713 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 714 &iph->saddr, iph->tos); 715 if (err > 1) { 716 ++tunnel->dev->stats.rx_frame_errors; 717 ++tunnel->dev->stats.rx_errors; 718 goto out; 719 } 720 } 721 722 tstats = this_cpu_ptr(tunnel->dev->tstats); 723 u64_stats_update_begin(&tstats->syncp); 724 tstats->rx_packets++; 725 tstats->rx_bytes += skb->len; 726 u64_stats_update_end(&tstats->syncp); 727 728 netif_rx(skb); 729 730 return 0; 731 } 732 733 /* no tunnel matched, let upstream know, ipsec may handle it */ 734 return 1; 735 out: 736 kfree_skb(skb); 737 return 0; 738 } 739 740 static const struct tnl_ptk_info ipip_tpi = { 741 /* no tunnel info required for ipip. */ 742 .proto = htons(ETH_P_IP), 743 }; 744 745 #if IS_ENABLED(CONFIG_MPLS) 746 static const struct tnl_ptk_info mplsip_tpi = { 747 /* no tunnel info required for mplsip. */ 748 .proto = htons(ETH_P_MPLS_UC), 749 }; 750 #endif 751 752 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 753 { 754 const struct iphdr *iph; 755 struct ip_tunnel *tunnel; 756 int sifindex; 757 758 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 759 760 iph = ip_hdr(skb); 761 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 762 iph->saddr, iph->daddr, sifindex); 763 if (tunnel) { 764 const struct tnl_ptk_info *tpi; 765 766 if (tunnel->parms.iph.protocol != ipproto && 767 tunnel->parms.iph.protocol != 0) 768 goto drop; 769 770 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 771 goto drop; 772 #if IS_ENABLED(CONFIG_MPLS) 773 if (ipproto == IPPROTO_MPLS) 774 tpi = &mplsip_tpi; 775 else 776 #endif 777 tpi = &ipip_tpi; 778 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 779 goto drop; 780 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 781 } 782 783 return 1; 784 785 drop: 786 kfree_skb(skb); 787 return 0; 788 } 789 790 static int ipip_rcv(struct sk_buff *skb) 791 { 792 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 793 } 794 795 #if IS_ENABLED(CONFIG_MPLS) 796 static int mplsip_rcv(struct sk_buff *skb) 797 { 798 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 799 } 800 #endif 801 802 /* 803 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 804 * stores the embedded IPv4 address in v4dst and returns true. 805 */ 806 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 807 __be32 *v4dst) 808 { 809 #ifdef CONFIG_IPV6_SIT_6RD 810 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 811 tunnel->ip6rd.prefixlen)) { 812 unsigned int pbw0, pbi0; 813 int pbi1; 814 u32 d; 815 816 pbw0 = tunnel->ip6rd.prefixlen >> 5; 817 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 818 819 d = tunnel->ip6rd.relay_prefixlen < 32 ? 820 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 821 tunnel->ip6rd.relay_prefixlen : 0; 822 823 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 824 if (pbi1 > 0) 825 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 826 (32 - pbi1); 827 828 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 829 return true; 830 } 831 #else 832 if (v6dst->s6_addr16[0] == htons(0x2002)) { 833 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 834 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 835 return true; 836 } 837 #endif 838 return false; 839 } 840 841 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 842 const struct in6_addr *v6dst) 843 { 844 __be32 dst = 0; 845 check_6rd(tunnel, v6dst, &dst); 846 return dst; 847 } 848 849 /* 850 * This function assumes it is being called from dev_queue_xmit() 851 * and that skb is filled properly by that function. 852 */ 853 854 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 855 struct net_device *dev) 856 { 857 struct ip_tunnel *tunnel = netdev_priv(dev); 858 const struct iphdr *tiph = &tunnel->parms.iph; 859 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 860 u8 tos = tunnel->parms.iph.tos; 861 __be16 df = tiph->frag_off; 862 struct rtable *rt; /* Route to the other host */ 863 struct net_device *tdev; /* Device to other host */ 864 unsigned int max_headroom; /* The extra header space needed */ 865 __be32 dst = tiph->daddr; 866 struct flowi4 fl4; 867 int mtu; 868 const struct in6_addr *addr6; 869 int addr_type; 870 u8 ttl; 871 u8 protocol = IPPROTO_IPV6; 872 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 873 874 if (tos == 1) 875 tos = ipv6_get_dsfield(iph6); 876 877 /* ISATAP (RFC4214) - must come before 6to4 */ 878 if (dev->priv_flags & IFF_ISATAP) { 879 struct neighbour *neigh = NULL; 880 bool do_tx_error = false; 881 882 if (skb_dst(skb)) 883 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 884 885 if (!neigh) { 886 net_dbg_ratelimited("nexthop == NULL\n"); 887 goto tx_error; 888 } 889 890 addr6 = (const struct in6_addr *)&neigh->primary_key; 891 addr_type = ipv6_addr_type(addr6); 892 893 if ((addr_type & IPV6_ADDR_UNICAST) && 894 ipv6_addr_is_isatap(addr6)) 895 dst = addr6->s6_addr32[3]; 896 else 897 do_tx_error = true; 898 899 neigh_release(neigh); 900 if (do_tx_error) 901 goto tx_error; 902 } 903 904 if (!dst) 905 dst = try_6rd(tunnel, &iph6->daddr); 906 907 if (!dst) { 908 struct neighbour *neigh = NULL; 909 bool do_tx_error = false; 910 911 if (skb_dst(skb)) 912 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 913 914 if (!neigh) { 915 net_dbg_ratelimited("nexthop == NULL\n"); 916 goto tx_error; 917 } 918 919 addr6 = (const struct in6_addr *)&neigh->primary_key; 920 addr_type = ipv6_addr_type(addr6); 921 922 if (addr_type == IPV6_ADDR_ANY) { 923 addr6 = &ipv6_hdr(skb)->daddr; 924 addr_type = ipv6_addr_type(addr6); 925 } 926 927 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 928 dst = addr6->s6_addr32[3]; 929 else 930 do_tx_error = true; 931 932 neigh_release(neigh); 933 if (do_tx_error) 934 goto tx_error; 935 } 936 937 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 938 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 939 0, dst, tiph->saddr, 0, 0, 940 sock_net_uid(tunnel->net, NULL)); 941 942 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 943 if (!rt) { 944 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 945 if (IS_ERR(rt)) { 946 dev->stats.tx_carrier_errors++; 947 goto tx_error_icmp; 948 } 949 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 950 } 951 952 if (rt->rt_type != RTN_UNICAST) { 953 ip_rt_put(rt); 954 dev->stats.tx_carrier_errors++; 955 goto tx_error_icmp; 956 } 957 tdev = rt->dst.dev; 958 959 if (tdev == dev) { 960 ip_rt_put(rt); 961 dev->stats.collisions++; 962 goto tx_error; 963 } 964 965 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 966 ip_rt_put(rt); 967 goto tx_error; 968 } 969 970 if (df) { 971 mtu = dst_mtu(&rt->dst) - t_hlen; 972 973 if (mtu < 68) { 974 dev->stats.collisions++; 975 ip_rt_put(rt); 976 goto tx_error; 977 } 978 979 if (mtu < IPV6_MIN_MTU) { 980 mtu = IPV6_MIN_MTU; 981 df = 0; 982 } 983 984 if (tunnel->parms.iph.daddr) 985 skb_dst_update_pmtu_no_confirm(skb, mtu); 986 987 if (skb->len > mtu && !skb_is_gso(skb)) { 988 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 989 ip_rt_put(rt); 990 goto tx_error; 991 } 992 } 993 994 if (tunnel->err_count > 0) { 995 if (time_before(jiffies, 996 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 997 tunnel->err_count--; 998 dst_link_failure(skb); 999 } else 1000 tunnel->err_count = 0; 1001 } 1002 1003 /* 1004 * Okay, now see if we can stuff it in the buffer as-is. 1005 */ 1006 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1007 1008 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1009 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1010 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1011 if (!new_skb) { 1012 ip_rt_put(rt); 1013 dev->stats.tx_dropped++; 1014 kfree_skb(skb); 1015 return NETDEV_TX_OK; 1016 } 1017 if (skb->sk) 1018 skb_set_owner_w(new_skb, skb->sk); 1019 dev_kfree_skb(skb); 1020 skb = new_skb; 1021 iph6 = ipv6_hdr(skb); 1022 } 1023 ttl = tiph->ttl; 1024 if (ttl == 0) 1025 ttl = iph6->hop_limit; 1026 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1027 1028 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1029 ip_rt_put(rt); 1030 goto tx_error; 1031 } 1032 1033 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1034 1035 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1036 df, !net_eq(tunnel->net, dev_net(dev))); 1037 return NETDEV_TX_OK; 1038 1039 tx_error_icmp: 1040 dst_link_failure(skb); 1041 tx_error: 1042 kfree_skb(skb); 1043 dev->stats.tx_errors++; 1044 return NETDEV_TX_OK; 1045 } 1046 1047 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1048 struct net_device *dev, u8 ipproto) 1049 { 1050 struct ip_tunnel *tunnel = netdev_priv(dev); 1051 const struct iphdr *tiph = &tunnel->parms.iph; 1052 1053 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1054 goto tx_error; 1055 1056 skb_set_inner_ipproto(skb, ipproto); 1057 1058 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1059 return NETDEV_TX_OK; 1060 tx_error: 1061 kfree_skb(skb); 1062 dev->stats.tx_errors++; 1063 return NETDEV_TX_OK; 1064 } 1065 1066 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1067 struct net_device *dev) 1068 { 1069 if (!pskb_inet_may_pull(skb)) 1070 goto tx_err; 1071 1072 switch (skb->protocol) { 1073 case htons(ETH_P_IP): 1074 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1075 break; 1076 case htons(ETH_P_IPV6): 1077 ipip6_tunnel_xmit(skb, dev); 1078 break; 1079 #if IS_ENABLED(CONFIG_MPLS) 1080 case htons(ETH_P_MPLS_UC): 1081 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1082 break; 1083 #endif 1084 default: 1085 goto tx_err; 1086 } 1087 1088 return NETDEV_TX_OK; 1089 1090 tx_err: 1091 dev->stats.tx_errors++; 1092 kfree_skb(skb); 1093 return NETDEV_TX_OK; 1094 1095 } 1096 1097 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1098 { 1099 struct net_device *tdev = NULL; 1100 struct ip_tunnel *tunnel; 1101 const struct iphdr *iph; 1102 struct flowi4 fl4; 1103 1104 tunnel = netdev_priv(dev); 1105 iph = &tunnel->parms.iph; 1106 1107 if (iph->daddr) { 1108 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1109 NULL, 1110 iph->daddr, iph->saddr, 1111 0, 0, 1112 IPPROTO_IPV6, 1113 RT_TOS(iph->tos), 1114 tunnel->parms.link); 1115 1116 if (!IS_ERR(rt)) { 1117 tdev = rt->dst.dev; 1118 ip_rt_put(rt); 1119 } 1120 dev->flags |= IFF_POINTOPOINT; 1121 } 1122 1123 if (!tdev && tunnel->parms.link) 1124 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1125 1126 if (tdev && !netif_is_l3_master(tdev)) { 1127 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1128 1129 dev->mtu = tdev->mtu - t_hlen; 1130 if (dev->mtu < IPV6_MIN_MTU) 1131 dev->mtu = IPV6_MIN_MTU; 1132 } 1133 } 1134 1135 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1136 __u32 fwmark) 1137 { 1138 struct net *net = t->net; 1139 struct sit_net *sitn = net_generic(net, sit_net_id); 1140 1141 ipip6_tunnel_unlink(sitn, t); 1142 synchronize_net(); 1143 t->parms.iph.saddr = p->iph.saddr; 1144 t->parms.iph.daddr = p->iph.daddr; 1145 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1146 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1147 ipip6_tunnel_link(sitn, t); 1148 t->parms.iph.ttl = p->iph.ttl; 1149 t->parms.iph.tos = p->iph.tos; 1150 t->parms.iph.frag_off = p->iph.frag_off; 1151 if (t->parms.link != p->link || t->fwmark != fwmark) { 1152 t->parms.link = p->link; 1153 t->fwmark = fwmark; 1154 ipip6_tunnel_bind_dev(t->dev); 1155 } 1156 dst_cache_reset(&t->dst_cache); 1157 netdev_state_change(t->dev); 1158 } 1159 1160 #ifdef CONFIG_IPV6_SIT_6RD 1161 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1162 struct ip_tunnel_6rd *ip6rd) 1163 { 1164 struct in6_addr prefix; 1165 __be32 relay_prefix; 1166 1167 if (ip6rd->relay_prefixlen > 32 || 1168 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1169 return -EINVAL; 1170 1171 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1172 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1173 return -EINVAL; 1174 if (ip6rd->relay_prefixlen) 1175 relay_prefix = ip6rd->relay_prefix & 1176 htonl(0xffffffffUL << 1177 (32 - ip6rd->relay_prefixlen)); 1178 else 1179 relay_prefix = 0; 1180 if (relay_prefix != ip6rd->relay_prefix) 1181 return -EINVAL; 1182 1183 t->ip6rd.prefix = prefix; 1184 t->ip6rd.relay_prefix = relay_prefix; 1185 t->ip6rd.prefixlen = ip6rd->prefixlen; 1186 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1187 dst_cache_reset(&t->dst_cache); 1188 netdev_state_change(t->dev); 1189 return 0; 1190 } 1191 1192 static int 1193 ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) 1194 { 1195 struct ip_tunnel *t = netdev_priv(dev); 1196 struct ip_tunnel_6rd ip6rd; 1197 struct ip_tunnel_parm p; 1198 1199 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1200 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1201 return -EFAULT; 1202 t = ipip6_tunnel_locate(t->net, &p, 0); 1203 } 1204 if (!t) 1205 t = netdev_priv(dev); 1206 1207 ip6rd.prefix = t->ip6rd.prefix; 1208 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1209 ip6rd.prefixlen = t->ip6rd.prefixlen; 1210 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1211 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) 1212 return -EFAULT; 1213 return 0; 1214 } 1215 1216 static int 1217 ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, 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, ifr->ifr_ifru.ifru_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_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1365 { 1366 switch (cmd) { 1367 case SIOCGETTUNNEL: 1368 case SIOCADDTUNNEL: 1369 case SIOCCHGTUNNEL: 1370 case SIOCDELTUNNEL: 1371 return ip_tunnel_ioctl(dev, ifr, cmd); 1372 case SIOCGETPRL: 1373 return ipip6_tunnel_get_prl(dev, ifr); 1374 case SIOCADDPRL: 1375 case SIOCDELPRL: 1376 case SIOCCHGPRL: 1377 return ipip6_tunnel_prl_ctl(dev, ifr, cmd); 1378 #ifdef CONFIG_IPV6_SIT_6RD 1379 case SIOCGET6RD: 1380 return ipip6_tunnel_get6rd(dev, ifr); 1381 case SIOCADD6RD: 1382 case SIOCCHG6RD: 1383 case SIOCDEL6RD: 1384 return ipip6_tunnel_6rdctl(dev, ifr, cmd); 1385 #endif 1386 default: 1387 return -EINVAL; 1388 } 1389 } 1390 1391 static const struct net_device_ops ipip6_netdev_ops = { 1392 .ndo_init = ipip6_tunnel_init, 1393 .ndo_uninit = ipip6_tunnel_uninit, 1394 .ndo_start_xmit = sit_tunnel_xmit, 1395 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1396 .ndo_get_stats64 = dev_get_tstats64, 1397 .ndo_get_iflink = ip_tunnel_get_iflink, 1398 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1399 }; 1400 1401 static void ipip6_dev_free(struct net_device *dev) 1402 { 1403 struct ip_tunnel *tunnel = netdev_priv(dev); 1404 1405 dst_cache_destroy(&tunnel->dst_cache); 1406 free_percpu(dev->tstats); 1407 } 1408 1409 #define SIT_FEATURES (NETIF_F_SG | \ 1410 NETIF_F_FRAGLIST | \ 1411 NETIF_F_HIGHDMA | \ 1412 NETIF_F_GSO_SOFTWARE | \ 1413 NETIF_F_HW_CSUM) 1414 1415 static void ipip6_tunnel_setup(struct net_device *dev) 1416 { 1417 struct ip_tunnel *tunnel = netdev_priv(dev); 1418 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1419 1420 dev->netdev_ops = &ipip6_netdev_ops; 1421 dev->header_ops = &ip_tunnel_header_ops; 1422 dev->needs_free_netdev = true; 1423 dev->priv_destructor = ipip6_dev_free; 1424 1425 dev->type = ARPHRD_SIT; 1426 dev->mtu = ETH_DATA_LEN - t_hlen; 1427 dev->min_mtu = IPV6_MIN_MTU; 1428 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1429 dev->flags = IFF_NOARP; 1430 netif_keep_dst(dev); 1431 dev->addr_len = 4; 1432 dev->features |= NETIF_F_LLTX; 1433 dev->features |= SIT_FEATURES; 1434 dev->hw_features |= SIT_FEATURES; 1435 } 1436 1437 static int ipip6_tunnel_init(struct net_device *dev) 1438 { 1439 struct ip_tunnel *tunnel = netdev_priv(dev); 1440 int err; 1441 1442 tunnel->dev = dev; 1443 tunnel->net = dev_net(dev); 1444 strcpy(tunnel->parms.name, dev->name); 1445 1446 ipip6_tunnel_bind_dev(dev); 1447 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1448 if (!dev->tstats) 1449 return -ENOMEM; 1450 1451 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1452 if (err) { 1453 free_percpu(dev->tstats); 1454 dev->tstats = NULL; 1455 return err; 1456 } 1457 dev_hold(dev); 1458 return 0; 1459 } 1460 1461 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1462 { 1463 struct ip_tunnel *tunnel = netdev_priv(dev); 1464 struct iphdr *iph = &tunnel->parms.iph; 1465 struct net *net = dev_net(dev); 1466 struct sit_net *sitn = net_generic(net, sit_net_id); 1467 1468 iph->version = 4; 1469 iph->protocol = IPPROTO_IPV6; 1470 iph->ihl = 5; 1471 iph->ttl = 64; 1472 1473 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1474 } 1475 1476 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1477 struct netlink_ext_ack *extack) 1478 { 1479 u8 proto; 1480 1481 if (!data || !data[IFLA_IPTUN_PROTO]) 1482 return 0; 1483 1484 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1485 if (!ipip6_valid_ip_proto(proto)) 1486 return -EINVAL; 1487 1488 return 0; 1489 } 1490 1491 static void ipip6_netlink_parms(struct nlattr *data[], 1492 struct ip_tunnel_parm *parms, 1493 __u32 *fwmark) 1494 { 1495 memset(parms, 0, sizeof(*parms)); 1496 1497 parms->iph.version = 4; 1498 parms->iph.protocol = IPPROTO_IPV6; 1499 parms->iph.ihl = 5; 1500 parms->iph.ttl = 64; 1501 1502 if (!data) 1503 return; 1504 1505 if (data[IFLA_IPTUN_LINK]) 1506 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1507 1508 if (data[IFLA_IPTUN_LOCAL]) 1509 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1510 1511 if (data[IFLA_IPTUN_REMOTE]) 1512 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1513 1514 if (data[IFLA_IPTUN_TTL]) { 1515 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1516 if (parms->iph.ttl) 1517 parms->iph.frag_off = htons(IP_DF); 1518 } 1519 1520 if (data[IFLA_IPTUN_TOS]) 1521 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1522 1523 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1524 parms->iph.frag_off = htons(IP_DF); 1525 1526 if (data[IFLA_IPTUN_FLAGS]) 1527 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1528 1529 if (data[IFLA_IPTUN_PROTO]) 1530 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1531 1532 if (data[IFLA_IPTUN_FWMARK]) 1533 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1534 } 1535 1536 /* This function returns true when ENCAP attributes are present in the nl msg */ 1537 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1538 struct ip_tunnel_encap *ipencap) 1539 { 1540 bool ret = false; 1541 1542 memset(ipencap, 0, sizeof(*ipencap)); 1543 1544 if (!data) 1545 return ret; 1546 1547 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1548 ret = true; 1549 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1550 } 1551 1552 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1553 ret = true; 1554 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1555 } 1556 1557 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1558 ret = true; 1559 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1560 } 1561 1562 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1563 ret = true; 1564 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1565 } 1566 1567 return ret; 1568 } 1569 1570 #ifdef CONFIG_IPV6_SIT_6RD 1571 /* This function returns true when 6RD attributes are present in the nl msg */ 1572 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1573 struct ip_tunnel_6rd *ip6rd) 1574 { 1575 bool ret = false; 1576 memset(ip6rd, 0, sizeof(*ip6rd)); 1577 1578 if (!data) 1579 return ret; 1580 1581 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1582 ret = true; 1583 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1584 } 1585 1586 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1587 ret = true; 1588 ip6rd->relay_prefix = 1589 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1590 } 1591 1592 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1593 ret = true; 1594 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1595 } 1596 1597 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1598 ret = true; 1599 ip6rd->relay_prefixlen = 1600 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1601 } 1602 1603 return ret; 1604 } 1605 #endif 1606 1607 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1608 struct nlattr *tb[], struct nlattr *data[], 1609 struct netlink_ext_ack *extack) 1610 { 1611 struct net *net = dev_net(dev); 1612 struct ip_tunnel *nt; 1613 struct ip_tunnel_encap ipencap; 1614 #ifdef CONFIG_IPV6_SIT_6RD 1615 struct ip_tunnel_6rd ip6rd; 1616 #endif 1617 int err; 1618 1619 nt = netdev_priv(dev); 1620 1621 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1622 err = ip_tunnel_encap_setup(nt, &ipencap); 1623 if (err < 0) 1624 return err; 1625 } 1626 1627 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1628 1629 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1630 return -EEXIST; 1631 1632 err = ipip6_tunnel_create(dev); 1633 if (err < 0) 1634 return err; 1635 1636 if (tb[IFLA_MTU]) { 1637 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1638 1639 if (mtu >= IPV6_MIN_MTU && 1640 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1641 dev->mtu = mtu; 1642 } 1643 1644 #ifdef CONFIG_IPV6_SIT_6RD 1645 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1646 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1647 if (err < 0) 1648 unregister_netdevice_queue(dev, NULL); 1649 } 1650 #endif 1651 1652 return err; 1653 } 1654 1655 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1656 struct nlattr *data[], 1657 struct netlink_ext_ack *extack) 1658 { 1659 struct ip_tunnel *t = netdev_priv(dev); 1660 struct ip_tunnel_parm p; 1661 struct ip_tunnel_encap ipencap; 1662 struct net *net = t->net; 1663 struct sit_net *sitn = net_generic(net, sit_net_id); 1664 #ifdef CONFIG_IPV6_SIT_6RD 1665 struct ip_tunnel_6rd ip6rd; 1666 #endif 1667 __u32 fwmark = t->fwmark; 1668 int err; 1669 1670 if (dev == sitn->fb_tunnel_dev) 1671 return -EINVAL; 1672 1673 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1674 err = ip_tunnel_encap_setup(t, &ipencap); 1675 if (err < 0) 1676 return err; 1677 } 1678 1679 ipip6_netlink_parms(data, &p, &fwmark); 1680 1681 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1682 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1683 return -EINVAL; 1684 1685 t = ipip6_tunnel_locate(net, &p, 0); 1686 1687 if (t) { 1688 if (t->dev != dev) 1689 return -EEXIST; 1690 } else 1691 t = netdev_priv(dev); 1692 1693 ipip6_tunnel_update(t, &p, fwmark); 1694 1695 #ifdef CONFIG_IPV6_SIT_6RD 1696 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1697 return ipip6_tunnel_update_6rd(t, &ip6rd); 1698 #endif 1699 1700 return 0; 1701 } 1702 1703 static size_t ipip6_get_size(const struct net_device *dev) 1704 { 1705 return 1706 /* IFLA_IPTUN_LINK */ 1707 nla_total_size(4) + 1708 /* IFLA_IPTUN_LOCAL */ 1709 nla_total_size(4) + 1710 /* IFLA_IPTUN_REMOTE */ 1711 nla_total_size(4) + 1712 /* IFLA_IPTUN_TTL */ 1713 nla_total_size(1) + 1714 /* IFLA_IPTUN_TOS */ 1715 nla_total_size(1) + 1716 /* IFLA_IPTUN_PMTUDISC */ 1717 nla_total_size(1) + 1718 /* IFLA_IPTUN_FLAGS */ 1719 nla_total_size(2) + 1720 /* IFLA_IPTUN_PROTO */ 1721 nla_total_size(1) + 1722 #ifdef CONFIG_IPV6_SIT_6RD 1723 /* IFLA_IPTUN_6RD_PREFIX */ 1724 nla_total_size(sizeof(struct in6_addr)) + 1725 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1726 nla_total_size(4) + 1727 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1728 nla_total_size(2) + 1729 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1730 nla_total_size(2) + 1731 #endif 1732 /* IFLA_IPTUN_ENCAP_TYPE */ 1733 nla_total_size(2) + 1734 /* IFLA_IPTUN_ENCAP_FLAGS */ 1735 nla_total_size(2) + 1736 /* IFLA_IPTUN_ENCAP_SPORT */ 1737 nla_total_size(2) + 1738 /* IFLA_IPTUN_ENCAP_DPORT */ 1739 nla_total_size(2) + 1740 /* IFLA_IPTUN_FWMARK */ 1741 nla_total_size(4) + 1742 0; 1743 } 1744 1745 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1746 { 1747 struct ip_tunnel *tunnel = netdev_priv(dev); 1748 struct ip_tunnel_parm *parm = &tunnel->parms; 1749 1750 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1751 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1752 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1753 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1754 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1755 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1756 !!(parm->iph.frag_off & htons(IP_DF))) || 1757 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1758 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1759 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1760 goto nla_put_failure; 1761 1762 #ifdef CONFIG_IPV6_SIT_6RD 1763 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1764 &tunnel->ip6rd.prefix) || 1765 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1766 tunnel->ip6rd.relay_prefix) || 1767 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1768 tunnel->ip6rd.prefixlen) || 1769 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1770 tunnel->ip6rd.relay_prefixlen)) 1771 goto nla_put_failure; 1772 #endif 1773 1774 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1775 tunnel->encap.type) || 1776 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1777 tunnel->encap.sport) || 1778 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1779 tunnel->encap.dport) || 1780 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1781 tunnel->encap.flags)) 1782 goto nla_put_failure; 1783 1784 return 0; 1785 1786 nla_put_failure: 1787 return -EMSGSIZE; 1788 } 1789 1790 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1791 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1792 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1793 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1794 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1795 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1796 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1797 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1798 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1799 #ifdef CONFIG_IPV6_SIT_6RD 1800 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1801 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1802 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1803 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1804 #endif 1805 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1806 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1807 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1808 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1809 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1810 }; 1811 1812 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1813 { 1814 struct net *net = dev_net(dev); 1815 struct sit_net *sitn = net_generic(net, sit_net_id); 1816 1817 if (dev != sitn->fb_tunnel_dev) 1818 unregister_netdevice_queue(dev, head); 1819 } 1820 1821 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1822 .kind = "sit", 1823 .maxtype = IFLA_IPTUN_MAX, 1824 .policy = ipip6_policy, 1825 .priv_size = sizeof(struct ip_tunnel), 1826 .setup = ipip6_tunnel_setup, 1827 .validate = ipip6_validate, 1828 .newlink = ipip6_newlink, 1829 .changelink = ipip6_changelink, 1830 .get_size = ipip6_get_size, 1831 .fill_info = ipip6_fill_info, 1832 .dellink = ipip6_dellink, 1833 .get_link_net = ip_tunnel_get_link_net, 1834 }; 1835 1836 static struct xfrm_tunnel sit_handler __read_mostly = { 1837 .handler = ipip6_rcv, 1838 .err_handler = ipip6_err, 1839 .priority = 1, 1840 }; 1841 1842 static struct xfrm_tunnel ipip_handler __read_mostly = { 1843 .handler = ipip_rcv, 1844 .err_handler = ipip6_err, 1845 .priority = 2, 1846 }; 1847 1848 #if IS_ENABLED(CONFIG_MPLS) 1849 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1850 .handler = mplsip_rcv, 1851 .err_handler = ipip6_err, 1852 .priority = 2, 1853 }; 1854 #endif 1855 1856 static void __net_exit sit_destroy_tunnels(struct net *net, 1857 struct list_head *head) 1858 { 1859 struct sit_net *sitn = net_generic(net, sit_net_id); 1860 struct net_device *dev, *aux; 1861 int prio; 1862 1863 for_each_netdev_safe(net, dev, aux) 1864 if (dev->rtnl_link_ops == &sit_link_ops) 1865 unregister_netdevice_queue(dev, head); 1866 1867 for (prio = 0; prio < 4; prio++) { 1868 int h; 1869 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1870 struct ip_tunnel *t; 1871 1872 t = rtnl_dereference(sitn->tunnels[prio][h]); 1873 while (t) { 1874 /* If dev is in the same netns, it has already 1875 * been added to the list by the previous loop. 1876 */ 1877 if (!net_eq(dev_net(t->dev), net)) 1878 unregister_netdevice_queue(t->dev, 1879 head); 1880 t = rtnl_dereference(t->next); 1881 } 1882 } 1883 } 1884 } 1885 1886 static int __net_init sit_init_net(struct net *net) 1887 { 1888 struct sit_net *sitn = net_generic(net, sit_net_id); 1889 struct ip_tunnel *t; 1890 int err; 1891 1892 sitn->tunnels[0] = sitn->tunnels_wc; 1893 sitn->tunnels[1] = sitn->tunnels_l; 1894 sitn->tunnels[2] = sitn->tunnels_r; 1895 sitn->tunnels[3] = sitn->tunnels_r_l; 1896 1897 if (!net_has_fallback_tunnels(net)) 1898 return 0; 1899 1900 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1901 NET_NAME_UNKNOWN, 1902 ipip6_tunnel_setup); 1903 if (!sitn->fb_tunnel_dev) { 1904 err = -ENOMEM; 1905 goto err_alloc_dev; 1906 } 1907 dev_net_set(sitn->fb_tunnel_dev, net); 1908 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1909 /* FB netdevice is special: we have one, and only one per netns. 1910 * Allowing to move it to another netns is clearly unsafe. 1911 */ 1912 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1913 1914 err = register_netdev(sitn->fb_tunnel_dev); 1915 if (err) 1916 goto err_reg_dev; 1917 1918 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1919 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1920 1921 t = netdev_priv(sitn->fb_tunnel_dev); 1922 1923 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1924 return 0; 1925 1926 err_reg_dev: 1927 ipip6_dev_free(sitn->fb_tunnel_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