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 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 ifreq *ifr) 303 { 304 struct ip_tunnel_prl __user *a = ifr->ifr_ifru.ifru_data; 305 struct ip_tunnel *t = netdev_priv(dev); 306 struct ip_tunnel_prl kprl, *kp; 307 struct ip_tunnel_prl_entry *prl; 308 unsigned int cmax, c = 0, ca, len; 309 int ret = 0; 310 311 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 312 return -EINVAL; 313 314 if (copy_from_user(&kprl, a, sizeof(kprl))) 315 return -EFAULT; 316 cmax = kprl.datalen / sizeof(kprl); 317 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 318 cmax = 1; 319 320 /* For simple GET or for root users, 321 * we try harder to allocate. 322 */ 323 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 324 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) : 325 NULL; 326 327 rcu_read_lock(); 328 329 ca = min(t->prl_count, cmax); 330 331 if (!kp) { 332 /* We don't try hard to allocate much memory for 333 * non-root users. 334 * For root users, retry allocating enough memory for 335 * the answer. 336 */ 337 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT | 338 __GFP_NOWARN); 339 if (!kp) { 340 ret = -ENOMEM; 341 goto out; 342 } 343 } 344 345 c = 0; 346 for_each_prl_rcu(t->prl) { 347 if (c >= cmax) 348 break; 349 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 350 continue; 351 kp[c].addr = prl->addr; 352 kp[c].flags = prl->flags; 353 c++; 354 if (kprl.addr != htonl(INADDR_ANY)) 355 break; 356 } 357 out: 358 rcu_read_unlock(); 359 360 len = sizeof(*kp) * c; 361 ret = 0; 362 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 363 ret = -EFAULT; 364 365 kfree(kp); 366 367 return ret; 368 } 369 370 static int 371 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 372 { 373 struct ip_tunnel_prl_entry *p; 374 int err = 0; 375 376 if (a->addr == htonl(INADDR_ANY)) 377 return -EINVAL; 378 379 ASSERT_RTNL(); 380 381 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 382 if (p->addr == a->addr) { 383 if (chg) { 384 p->flags = a->flags; 385 goto out; 386 } 387 err = -EEXIST; 388 goto out; 389 } 390 } 391 392 if (chg) { 393 err = -ENXIO; 394 goto out; 395 } 396 397 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 398 if (!p) { 399 err = -ENOBUFS; 400 goto out; 401 } 402 403 p->next = t->prl; 404 p->addr = a->addr; 405 p->flags = a->flags; 406 t->prl_count++; 407 rcu_assign_pointer(t->prl, p); 408 out: 409 return err; 410 } 411 412 static void prl_list_destroy_rcu(struct rcu_head *head) 413 { 414 struct ip_tunnel_prl_entry *p, *n; 415 416 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 417 do { 418 n = rcu_dereference_protected(p->next, 1); 419 kfree(p); 420 p = n; 421 } while (p); 422 } 423 424 static int 425 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 426 { 427 struct ip_tunnel_prl_entry *x; 428 struct ip_tunnel_prl_entry __rcu **p; 429 int err = 0; 430 431 ASSERT_RTNL(); 432 433 if (a && a->addr != htonl(INADDR_ANY)) { 434 for (p = &t->prl; 435 (x = rtnl_dereference(*p)) != NULL; 436 p = &x->next) { 437 if (x->addr == a->addr) { 438 *p = x->next; 439 kfree_rcu(x, rcu_head); 440 t->prl_count--; 441 goto out; 442 } 443 } 444 err = -ENXIO; 445 } else { 446 x = rtnl_dereference(t->prl); 447 if (x) { 448 t->prl_count = 0; 449 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 450 t->prl = NULL; 451 } 452 } 453 out: 454 return err; 455 } 456 457 static int ipip6_tunnel_prl_ctl(struct net_device *dev, struct ifreq *ifr, 458 int cmd) 459 { 460 struct ip_tunnel *t = netdev_priv(dev); 461 struct ip_tunnel_prl prl; 462 int err; 463 464 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 465 return -EPERM; 466 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 467 return -EINVAL; 468 469 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 470 return -EFAULT; 471 472 switch (cmd) { 473 case SIOCDELPRL: 474 err = ipip6_tunnel_del_prl(t, &prl); 475 break; 476 case SIOCADDPRL: 477 case SIOCCHGPRL: 478 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 479 break; 480 } 481 dst_cache_reset(&t->dst_cache); 482 netdev_state_change(dev); 483 return err; 484 } 485 486 static int 487 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 488 { 489 struct ip_tunnel_prl_entry *p; 490 int ok = 1; 491 492 rcu_read_lock(); 493 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 494 if (p) { 495 if (p->flags & PRL_DEFAULT) 496 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 497 else 498 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 499 } else { 500 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 501 502 if (ipv6_addr_is_isatap(addr6) && 503 (addr6->s6_addr32[3] == iph->saddr) && 504 ipv6_chk_prefix(addr6, t->dev)) 505 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 506 else 507 ok = 0; 508 } 509 rcu_read_unlock(); 510 return ok; 511 } 512 513 static void ipip6_tunnel_uninit(struct net_device *dev) 514 { 515 struct ip_tunnel *tunnel = netdev_priv(dev); 516 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 517 518 if (dev == sitn->fb_tunnel_dev) { 519 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 520 } else { 521 ipip6_tunnel_unlink(sitn, tunnel); 522 ipip6_tunnel_del_prl(tunnel, NULL); 523 } 524 dst_cache_reset(&tunnel->dst_cache); 525 dev_put(dev); 526 } 527 528 static int ipip6_err(struct sk_buff *skb, u32 info) 529 { 530 const struct iphdr *iph = (const struct iphdr *)skb->data; 531 const int type = icmp_hdr(skb)->type; 532 const int code = icmp_hdr(skb)->code; 533 unsigned int data_len = 0; 534 struct ip_tunnel *t; 535 int sifindex; 536 int err; 537 538 switch (type) { 539 default: 540 case ICMP_PARAMETERPROB: 541 return 0; 542 543 case ICMP_DEST_UNREACH: 544 switch (code) { 545 case ICMP_SR_FAILED: 546 /* Impossible event. */ 547 return 0; 548 default: 549 /* All others are translated to HOST_UNREACH. 550 rfc2003 contains "deep thoughts" about NET_UNREACH, 551 I believe they are just ether pollution. --ANK 552 */ 553 break; 554 } 555 break; 556 case ICMP_TIME_EXCEEDED: 557 if (code != ICMP_EXC_TTL) 558 return 0; 559 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 560 break; 561 case ICMP_REDIRECT: 562 break; 563 } 564 565 err = -ENOENT; 566 567 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 568 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 569 iph->daddr, iph->saddr, sifindex); 570 if (!t) 571 goto out; 572 573 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 574 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 575 t->parms.link, iph->protocol); 576 err = 0; 577 goto out; 578 } 579 if (type == ICMP_REDIRECT) { 580 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 581 iph->protocol); 582 err = 0; 583 goto out; 584 } 585 586 err = 0; 587 if (__in6_dev_get(skb->dev) && 588 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 589 goto out; 590 591 if (t->parms.iph.daddr == 0) 592 goto out; 593 594 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 595 goto out; 596 597 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 598 t->err_count++; 599 else 600 t->err_count = 1; 601 t->err_time = jiffies; 602 out: 603 return err; 604 } 605 606 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 607 const struct in6_addr *v6addr) 608 { 609 __be32 v4embed = 0; 610 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 611 return true; 612 return false; 613 } 614 615 /* Checks if an address matches an address on the tunnel interface. 616 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 617 * Long story: 618 * This function is called after we considered the packet as spoofed 619 * in is_spoofed_6rd. 620 * We may have a router that is doing NAT for proto 41 packets 621 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 622 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 623 * function will return true, dropping the packet. 624 * But, we can still check if is spoofed against the IP 625 * addresses associated with the interface. 626 */ 627 static bool only_dnatted(const struct ip_tunnel *tunnel, 628 const struct in6_addr *v6dst) 629 { 630 int prefix_len; 631 632 #ifdef CONFIG_IPV6_SIT_6RD 633 prefix_len = tunnel->ip6rd.prefixlen + 32 634 - tunnel->ip6rd.relay_prefixlen; 635 #else 636 prefix_len = 48; 637 #endif 638 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 639 } 640 641 /* Returns true if a packet is spoofed */ 642 static bool packet_is_spoofed(struct sk_buff *skb, 643 const struct iphdr *iph, 644 struct ip_tunnel *tunnel) 645 { 646 const struct ipv6hdr *ipv6h; 647 648 if (tunnel->dev->priv_flags & IFF_ISATAP) { 649 if (!isatap_chksrc(skb, iph, tunnel)) 650 return true; 651 652 return false; 653 } 654 655 if (tunnel->dev->flags & IFF_POINTOPOINT) 656 return false; 657 658 ipv6h = ipv6_hdr(skb); 659 660 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 661 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 662 &iph->saddr, &ipv6h->saddr, 663 &iph->daddr, &ipv6h->daddr); 664 return true; 665 } 666 667 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 668 return false; 669 670 if (only_dnatted(tunnel, &ipv6h->daddr)) 671 return false; 672 673 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 674 &iph->saddr, &ipv6h->saddr, 675 &iph->daddr, &ipv6h->daddr); 676 return true; 677 } 678 679 static int ipip6_rcv(struct sk_buff *skb) 680 { 681 const struct iphdr *iph = ip_hdr(skb); 682 struct ip_tunnel *tunnel; 683 int sifindex; 684 int err; 685 686 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 687 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 688 iph->saddr, iph->daddr, sifindex); 689 if (tunnel) { 690 struct pcpu_sw_netstats *tstats; 691 692 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 693 tunnel->parms.iph.protocol != 0) 694 goto out; 695 696 skb->mac_header = skb->network_header; 697 skb_reset_network_header(skb); 698 IPCB(skb)->flags = 0; 699 skb->dev = tunnel->dev; 700 701 if (packet_is_spoofed(skb, iph, tunnel)) { 702 tunnel->dev->stats.rx_errors++; 703 goto out; 704 } 705 706 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 707 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 708 goto out; 709 710 /* skb can be uncloned in iptunnel_pull_header, so 711 * old iph is no longer valid 712 */ 713 iph = (const struct iphdr *)skb_mac_header(skb); 714 skb_reset_mac_header(skb); 715 716 err = IP_ECN_decapsulate(iph, skb); 717 if (unlikely(err)) { 718 if (log_ecn_error) 719 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 720 &iph->saddr, iph->tos); 721 if (err > 1) { 722 ++tunnel->dev->stats.rx_frame_errors; 723 ++tunnel->dev->stats.rx_errors; 724 goto out; 725 } 726 } 727 728 tstats = this_cpu_ptr(tunnel->dev->tstats); 729 u64_stats_update_begin(&tstats->syncp); 730 tstats->rx_packets++; 731 tstats->rx_bytes += skb->len; 732 u64_stats_update_end(&tstats->syncp); 733 734 netif_rx(skb); 735 736 return 0; 737 } 738 739 /* no tunnel matched, let upstream know, ipsec may handle it */ 740 return 1; 741 out: 742 kfree_skb(skb); 743 return 0; 744 } 745 746 static const struct tnl_ptk_info ipip_tpi = { 747 /* no tunnel info required for ipip. */ 748 .proto = htons(ETH_P_IP), 749 }; 750 751 #if IS_ENABLED(CONFIG_MPLS) 752 static const struct tnl_ptk_info mplsip_tpi = { 753 /* no tunnel info required for mplsip. */ 754 .proto = htons(ETH_P_MPLS_UC), 755 }; 756 #endif 757 758 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 759 { 760 const struct iphdr *iph; 761 struct ip_tunnel *tunnel; 762 int sifindex; 763 764 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 765 766 iph = ip_hdr(skb); 767 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 768 iph->saddr, iph->daddr, sifindex); 769 if (tunnel) { 770 const struct tnl_ptk_info *tpi; 771 772 if (tunnel->parms.iph.protocol != ipproto && 773 tunnel->parms.iph.protocol != 0) 774 goto drop; 775 776 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 777 goto drop; 778 #if IS_ENABLED(CONFIG_MPLS) 779 if (ipproto == IPPROTO_MPLS) 780 tpi = &mplsip_tpi; 781 else 782 #endif 783 tpi = &ipip_tpi; 784 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 785 goto drop; 786 skb_reset_mac_header(skb); 787 788 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 789 } 790 791 return 1; 792 793 drop: 794 kfree_skb(skb); 795 return 0; 796 } 797 798 static int ipip_rcv(struct sk_buff *skb) 799 { 800 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 801 } 802 803 #if IS_ENABLED(CONFIG_MPLS) 804 static int mplsip_rcv(struct sk_buff *skb) 805 { 806 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 807 } 808 #endif 809 810 /* 811 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 812 * stores the embedded IPv4 address in v4dst and returns true. 813 */ 814 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 815 __be32 *v4dst) 816 { 817 #ifdef CONFIG_IPV6_SIT_6RD 818 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 819 tunnel->ip6rd.prefixlen)) { 820 unsigned int pbw0, pbi0; 821 int pbi1; 822 u32 d; 823 824 pbw0 = tunnel->ip6rd.prefixlen >> 5; 825 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 826 827 d = tunnel->ip6rd.relay_prefixlen < 32 ? 828 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 829 tunnel->ip6rd.relay_prefixlen : 0; 830 831 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 832 if (pbi1 > 0) 833 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 834 (32 - pbi1); 835 836 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 837 return true; 838 } 839 #else 840 if (v6dst->s6_addr16[0] == htons(0x2002)) { 841 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 842 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 843 return true; 844 } 845 #endif 846 return false; 847 } 848 849 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 850 const struct in6_addr *v6dst) 851 { 852 __be32 dst = 0; 853 check_6rd(tunnel, v6dst, &dst); 854 return dst; 855 } 856 857 /* 858 * This function assumes it is being called from dev_queue_xmit() 859 * and that skb is filled properly by that function. 860 */ 861 862 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 863 struct net_device *dev) 864 { 865 struct ip_tunnel *tunnel = netdev_priv(dev); 866 const struct iphdr *tiph = &tunnel->parms.iph; 867 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 868 u8 tos = tunnel->parms.iph.tos; 869 __be16 df = tiph->frag_off; 870 struct rtable *rt; /* Route to the other host */ 871 struct net_device *tdev; /* Device to other host */ 872 unsigned int max_headroom; /* The extra header space needed */ 873 __be32 dst = tiph->daddr; 874 struct flowi4 fl4; 875 int mtu; 876 const struct in6_addr *addr6; 877 int addr_type; 878 u8 ttl; 879 u8 protocol = IPPROTO_IPV6; 880 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 881 882 if (tos == 1) 883 tos = ipv6_get_dsfield(iph6); 884 885 /* ISATAP (RFC4214) - must come before 6to4 */ 886 if (dev->priv_flags & IFF_ISATAP) { 887 struct neighbour *neigh = NULL; 888 bool do_tx_error = false; 889 890 if (skb_dst(skb)) 891 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 892 893 if (!neigh) { 894 net_dbg_ratelimited("nexthop == NULL\n"); 895 goto tx_error; 896 } 897 898 addr6 = (const struct in6_addr *)&neigh->primary_key; 899 addr_type = ipv6_addr_type(addr6); 900 901 if ((addr_type & IPV6_ADDR_UNICAST) && 902 ipv6_addr_is_isatap(addr6)) 903 dst = addr6->s6_addr32[3]; 904 else 905 do_tx_error = true; 906 907 neigh_release(neigh); 908 if (do_tx_error) 909 goto tx_error; 910 } 911 912 if (!dst) 913 dst = try_6rd(tunnel, &iph6->daddr); 914 915 if (!dst) { 916 struct neighbour *neigh = NULL; 917 bool do_tx_error = false; 918 919 if (skb_dst(skb)) 920 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 921 922 if (!neigh) { 923 net_dbg_ratelimited("nexthop == NULL\n"); 924 goto tx_error; 925 } 926 927 addr6 = (const struct in6_addr *)&neigh->primary_key; 928 addr_type = ipv6_addr_type(addr6); 929 930 if (addr_type == IPV6_ADDR_ANY) { 931 addr6 = &ipv6_hdr(skb)->daddr; 932 addr_type = ipv6_addr_type(addr6); 933 } 934 935 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 936 dst = addr6->s6_addr32[3]; 937 else 938 do_tx_error = true; 939 940 neigh_release(neigh); 941 if (do_tx_error) 942 goto tx_error; 943 } 944 945 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 946 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 947 0, dst, tiph->saddr, 0, 0, 948 sock_net_uid(tunnel->net, NULL)); 949 950 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 951 if (!rt) { 952 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 953 if (IS_ERR(rt)) { 954 dev->stats.tx_carrier_errors++; 955 goto tx_error_icmp; 956 } 957 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 958 } 959 960 if (rt->rt_type != RTN_UNICAST) { 961 ip_rt_put(rt); 962 dev->stats.tx_carrier_errors++; 963 goto tx_error_icmp; 964 } 965 tdev = rt->dst.dev; 966 967 if (tdev == dev) { 968 ip_rt_put(rt); 969 dev->stats.collisions++; 970 goto tx_error; 971 } 972 973 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 974 ip_rt_put(rt); 975 goto tx_error; 976 } 977 978 if (df) { 979 mtu = dst_mtu(&rt->dst) - t_hlen; 980 981 if (mtu < IPV4_MIN_MTU) { 982 dev->stats.collisions++; 983 ip_rt_put(rt); 984 goto tx_error; 985 } 986 987 if (mtu < IPV6_MIN_MTU) { 988 mtu = IPV6_MIN_MTU; 989 df = 0; 990 } 991 992 if (tunnel->parms.iph.daddr) 993 skb_dst_update_pmtu_no_confirm(skb, mtu); 994 995 if (skb->len > mtu && !skb_is_gso(skb)) { 996 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 997 ip_rt_put(rt); 998 goto tx_error; 999 } 1000 } 1001 1002 if (tunnel->err_count > 0) { 1003 if (time_before(jiffies, 1004 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 1005 tunnel->err_count--; 1006 dst_link_failure(skb); 1007 } else 1008 tunnel->err_count = 0; 1009 } 1010 1011 /* 1012 * Okay, now see if we can stuff it in the buffer as-is. 1013 */ 1014 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1015 1016 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1017 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1018 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1019 if (!new_skb) { 1020 ip_rt_put(rt); 1021 dev->stats.tx_dropped++; 1022 kfree_skb(skb); 1023 return NETDEV_TX_OK; 1024 } 1025 if (skb->sk) 1026 skb_set_owner_w(new_skb, skb->sk); 1027 dev_kfree_skb(skb); 1028 skb = new_skb; 1029 iph6 = ipv6_hdr(skb); 1030 } 1031 ttl = tiph->ttl; 1032 if (ttl == 0) 1033 ttl = iph6->hop_limit; 1034 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1035 1036 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 1037 ip_rt_put(rt); 1038 goto tx_error; 1039 } 1040 1041 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1042 1043 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1044 df, !net_eq(tunnel->net, dev_net(dev))); 1045 return NETDEV_TX_OK; 1046 1047 tx_error_icmp: 1048 dst_link_failure(skb); 1049 tx_error: 1050 kfree_skb(skb); 1051 dev->stats.tx_errors++; 1052 return NETDEV_TX_OK; 1053 } 1054 1055 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1056 struct net_device *dev, u8 ipproto) 1057 { 1058 struct ip_tunnel *tunnel = netdev_priv(dev); 1059 const struct iphdr *tiph = &tunnel->parms.iph; 1060 1061 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1062 goto tx_error; 1063 1064 skb_set_inner_ipproto(skb, ipproto); 1065 1066 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1067 return NETDEV_TX_OK; 1068 tx_error: 1069 kfree_skb(skb); 1070 dev->stats.tx_errors++; 1071 return NETDEV_TX_OK; 1072 } 1073 1074 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1075 struct net_device *dev) 1076 { 1077 if (!pskb_inet_may_pull(skb)) 1078 goto tx_err; 1079 1080 switch (skb->protocol) { 1081 case htons(ETH_P_IP): 1082 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1083 break; 1084 case htons(ETH_P_IPV6): 1085 ipip6_tunnel_xmit(skb, dev); 1086 break; 1087 #if IS_ENABLED(CONFIG_MPLS) 1088 case htons(ETH_P_MPLS_UC): 1089 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1090 break; 1091 #endif 1092 default: 1093 goto tx_err; 1094 } 1095 1096 return NETDEV_TX_OK; 1097 1098 tx_err: 1099 dev->stats.tx_errors++; 1100 kfree_skb(skb); 1101 return NETDEV_TX_OK; 1102 1103 } 1104 1105 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1106 { 1107 struct net_device *tdev = NULL; 1108 struct ip_tunnel *tunnel; 1109 const struct iphdr *iph; 1110 struct flowi4 fl4; 1111 1112 tunnel = netdev_priv(dev); 1113 iph = &tunnel->parms.iph; 1114 1115 if (iph->daddr) { 1116 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1117 NULL, 1118 iph->daddr, iph->saddr, 1119 0, 0, 1120 IPPROTO_IPV6, 1121 RT_TOS(iph->tos), 1122 tunnel->parms.link); 1123 1124 if (!IS_ERR(rt)) { 1125 tdev = rt->dst.dev; 1126 ip_rt_put(rt); 1127 } 1128 dev->flags |= IFF_POINTOPOINT; 1129 } 1130 1131 if (!tdev && tunnel->parms.link) 1132 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1133 1134 if (tdev && !netif_is_l3_master(tdev)) { 1135 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1136 1137 dev->mtu = tdev->mtu - t_hlen; 1138 if (dev->mtu < IPV6_MIN_MTU) 1139 dev->mtu = IPV6_MIN_MTU; 1140 } 1141 } 1142 1143 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1144 __u32 fwmark) 1145 { 1146 struct net *net = t->net; 1147 struct sit_net *sitn = net_generic(net, sit_net_id); 1148 1149 ipip6_tunnel_unlink(sitn, t); 1150 synchronize_net(); 1151 t->parms.iph.saddr = p->iph.saddr; 1152 t->parms.iph.daddr = p->iph.daddr; 1153 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1154 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1155 ipip6_tunnel_link(sitn, t); 1156 t->parms.iph.ttl = p->iph.ttl; 1157 t->parms.iph.tos = p->iph.tos; 1158 t->parms.iph.frag_off = p->iph.frag_off; 1159 if (t->parms.link != p->link || t->fwmark != fwmark) { 1160 t->parms.link = p->link; 1161 t->fwmark = fwmark; 1162 ipip6_tunnel_bind_dev(t->dev); 1163 } 1164 dst_cache_reset(&t->dst_cache); 1165 netdev_state_change(t->dev); 1166 } 1167 1168 #ifdef CONFIG_IPV6_SIT_6RD 1169 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1170 struct ip_tunnel_6rd *ip6rd) 1171 { 1172 struct in6_addr prefix; 1173 __be32 relay_prefix; 1174 1175 if (ip6rd->relay_prefixlen > 32 || 1176 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1177 return -EINVAL; 1178 1179 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1180 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1181 return -EINVAL; 1182 if (ip6rd->relay_prefixlen) 1183 relay_prefix = ip6rd->relay_prefix & 1184 htonl(0xffffffffUL << 1185 (32 - ip6rd->relay_prefixlen)); 1186 else 1187 relay_prefix = 0; 1188 if (relay_prefix != ip6rd->relay_prefix) 1189 return -EINVAL; 1190 1191 t->ip6rd.prefix = prefix; 1192 t->ip6rd.relay_prefix = relay_prefix; 1193 t->ip6rd.prefixlen = ip6rd->prefixlen; 1194 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1195 dst_cache_reset(&t->dst_cache); 1196 netdev_state_change(t->dev); 1197 return 0; 1198 } 1199 1200 static int 1201 ipip6_tunnel_get6rd(struct net_device *dev, struct ifreq *ifr) 1202 { 1203 struct ip_tunnel *t = netdev_priv(dev); 1204 struct ip_tunnel_6rd ip6rd; 1205 struct ip_tunnel_parm p; 1206 1207 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1208 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1209 return -EFAULT; 1210 t = ipip6_tunnel_locate(t->net, &p, 0); 1211 } 1212 if (!t) 1213 t = netdev_priv(dev); 1214 1215 ip6rd.prefix = t->ip6rd.prefix; 1216 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1217 ip6rd.prefixlen = t->ip6rd.prefixlen; 1218 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1219 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, sizeof(ip6rd))) 1220 return -EFAULT; 1221 return 0; 1222 } 1223 1224 static int 1225 ipip6_tunnel_6rdctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1226 { 1227 struct ip_tunnel *t = netdev_priv(dev); 1228 struct ip_tunnel_6rd ip6rd; 1229 int err; 1230 1231 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1232 return -EPERM; 1233 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, sizeof(ip6rd))) 1234 return -EFAULT; 1235 1236 if (cmd != SIOCDEL6RD) { 1237 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1238 if (err < 0) 1239 return err; 1240 } else 1241 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1242 return 0; 1243 } 1244 1245 #endif /* CONFIG_IPV6_SIT_6RD */ 1246 1247 static bool ipip6_valid_ip_proto(u8 ipproto) 1248 { 1249 return ipproto == IPPROTO_IPV6 || 1250 ipproto == IPPROTO_IPIP || 1251 #if IS_ENABLED(CONFIG_MPLS) 1252 ipproto == IPPROTO_MPLS || 1253 #endif 1254 ipproto == 0; 1255 } 1256 1257 static int 1258 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p) 1259 { 1260 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1261 return -EPERM; 1262 1263 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1264 return -EINVAL; 1265 if (p->iph.version != 4 || 1266 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1267 return -EINVAL; 1268 1269 if (p->iph.ttl) 1270 p->iph.frag_off |= htons(IP_DF); 1271 return 0; 1272 } 1273 1274 static int 1275 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p) 1276 { 1277 struct ip_tunnel *t = netdev_priv(dev); 1278 1279 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1280 t = ipip6_tunnel_locate(t->net, p, 0); 1281 if (!t) 1282 t = netdev_priv(dev); 1283 memcpy(p, &t->parms, sizeof(*p)); 1284 return 0; 1285 } 1286 1287 static int 1288 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p) 1289 { 1290 struct ip_tunnel *t = netdev_priv(dev); 1291 int err; 1292 1293 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1294 if (err) 1295 return err; 1296 1297 t = ipip6_tunnel_locate(t->net, p, 1); 1298 if (!t) 1299 return -ENOBUFS; 1300 return 0; 1301 } 1302 1303 static int 1304 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p) 1305 { 1306 struct ip_tunnel *t = netdev_priv(dev); 1307 int err; 1308 1309 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1310 if (err) 1311 return err; 1312 1313 t = ipip6_tunnel_locate(t->net, p, 0); 1314 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1315 if (!t) 1316 return -ENOENT; 1317 } else { 1318 if (t) { 1319 if (t->dev != dev) 1320 return -EEXIST; 1321 } else { 1322 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1323 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1324 return -EINVAL; 1325 t = netdev_priv(dev); 1326 } 1327 1328 ipip6_tunnel_update(t, p, t->fwmark); 1329 } 1330 1331 return 0; 1332 } 1333 1334 static int 1335 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p) 1336 { 1337 struct ip_tunnel *t = netdev_priv(dev); 1338 1339 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1340 return -EPERM; 1341 1342 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1343 t = ipip6_tunnel_locate(t->net, p, 0); 1344 if (!t) 1345 return -ENOENT; 1346 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1347 return -EPERM; 1348 dev = t->dev; 1349 } 1350 unregister_netdevice(dev); 1351 return 0; 1352 } 1353 1354 static int 1355 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd) 1356 { 1357 switch (cmd) { 1358 case SIOCGETTUNNEL: 1359 return ipip6_tunnel_get(dev, p); 1360 case SIOCADDTUNNEL: 1361 return ipip6_tunnel_add(dev, p); 1362 case SIOCCHGTUNNEL: 1363 return ipip6_tunnel_change(dev, p); 1364 case SIOCDELTUNNEL: 1365 return ipip6_tunnel_del(dev, p); 1366 default: 1367 return -EINVAL; 1368 } 1369 } 1370 1371 static int 1372 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1373 { 1374 switch (cmd) { 1375 case SIOCGETTUNNEL: 1376 case SIOCADDTUNNEL: 1377 case SIOCCHGTUNNEL: 1378 case SIOCDELTUNNEL: 1379 return ip_tunnel_ioctl(dev, ifr, cmd); 1380 case SIOCGETPRL: 1381 return ipip6_tunnel_get_prl(dev, ifr); 1382 case SIOCADDPRL: 1383 case SIOCDELPRL: 1384 case SIOCCHGPRL: 1385 return ipip6_tunnel_prl_ctl(dev, ifr, cmd); 1386 #ifdef CONFIG_IPV6_SIT_6RD 1387 case SIOCGET6RD: 1388 return ipip6_tunnel_get6rd(dev, ifr); 1389 case SIOCADD6RD: 1390 case SIOCCHG6RD: 1391 case SIOCDEL6RD: 1392 return ipip6_tunnel_6rdctl(dev, ifr, cmd); 1393 #endif 1394 default: 1395 return -EINVAL; 1396 } 1397 } 1398 1399 static const struct net_device_ops ipip6_netdev_ops = { 1400 .ndo_init = ipip6_tunnel_init, 1401 .ndo_uninit = ipip6_tunnel_uninit, 1402 .ndo_start_xmit = sit_tunnel_xmit, 1403 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1404 .ndo_get_stats64 = dev_get_tstats64, 1405 .ndo_get_iflink = ip_tunnel_get_iflink, 1406 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1407 }; 1408 1409 static void ipip6_dev_free(struct net_device *dev) 1410 { 1411 struct ip_tunnel *tunnel = netdev_priv(dev); 1412 1413 dst_cache_destroy(&tunnel->dst_cache); 1414 free_percpu(dev->tstats); 1415 } 1416 1417 #define SIT_FEATURES (NETIF_F_SG | \ 1418 NETIF_F_FRAGLIST | \ 1419 NETIF_F_HIGHDMA | \ 1420 NETIF_F_GSO_SOFTWARE | \ 1421 NETIF_F_HW_CSUM) 1422 1423 static void ipip6_tunnel_setup(struct net_device *dev) 1424 { 1425 struct ip_tunnel *tunnel = netdev_priv(dev); 1426 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1427 1428 dev->netdev_ops = &ipip6_netdev_ops; 1429 dev->header_ops = &ip_tunnel_header_ops; 1430 dev->needs_free_netdev = true; 1431 dev->priv_destructor = ipip6_dev_free; 1432 1433 dev->type = ARPHRD_SIT; 1434 dev->mtu = ETH_DATA_LEN - t_hlen; 1435 dev->min_mtu = IPV6_MIN_MTU; 1436 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1437 dev->flags = IFF_NOARP; 1438 netif_keep_dst(dev); 1439 dev->addr_len = 4; 1440 dev->features |= NETIF_F_LLTX; 1441 dev->features |= SIT_FEATURES; 1442 dev->hw_features |= SIT_FEATURES; 1443 } 1444 1445 static int ipip6_tunnel_init(struct net_device *dev) 1446 { 1447 struct ip_tunnel *tunnel = netdev_priv(dev); 1448 int err; 1449 1450 tunnel->dev = dev; 1451 tunnel->net = dev_net(dev); 1452 strcpy(tunnel->parms.name, dev->name); 1453 1454 ipip6_tunnel_bind_dev(dev); 1455 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1456 if (!dev->tstats) 1457 return -ENOMEM; 1458 1459 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1460 if (err) { 1461 free_percpu(dev->tstats); 1462 dev->tstats = NULL; 1463 return err; 1464 } 1465 dev_hold(dev); 1466 return 0; 1467 } 1468 1469 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1470 { 1471 struct ip_tunnel *tunnel = netdev_priv(dev); 1472 struct iphdr *iph = &tunnel->parms.iph; 1473 struct net *net = dev_net(dev); 1474 struct sit_net *sitn = net_generic(net, sit_net_id); 1475 1476 iph->version = 4; 1477 iph->protocol = IPPROTO_IPV6; 1478 iph->ihl = 5; 1479 iph->ttl = 64; 1480 1481 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1482 } 1483 1484 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1485 struct netlink_ext_ack *extack) 1486 { 1487 u8 proto; 1488 1489 if (!data || !data[IFLA_IPTUN_PROTO]) 1490 return 0; 1491 1492 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1493 if (!ipip6_valid_ip_proto(proto)) 1494 return -EINVAL; 1495 1496 return 0; 1497 } 1498 1499 static void ipip6_netlink_parms(struct nlattr *data[], 1500 struct ip_tunnel_parm *parms, 1501 __u32 *fwmark) 1502 { 1503 memset(parms, 0, sizeof(*parms)); 1504 1505 parms->iph.version = 4; 1506 parms->iph.protocol = IPPROTO_IPV6; 1507 parms->iph.ihl = 5; 1508 parms->iph.ttl = 64; 1509 1510 if (!data) 1511 return; 1512 1513 if (data[IFLA_IPTUN_LINK]) 1514 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1515 1516 if (data[IFLA_IPTUN_LOCAL]) 1517 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1518 1519 if (data[IFLA_IPTUN_REMOTE]) 1520 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1521 1522 if (data[IFLA_IPTUN_TTL]) { 1523 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1524 if (parms->iph.ttl) 1525 parms->iph.frag_off = htons(IP_DF); 1526 } 1527 1528 if (data[IFLA_IPTUN_TOS]) 1529 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1530 1531 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1532 parms->iph.frag_off = htons(IP_DF); 1533 1534 if (data[IFLA_IPTUN_FLAGS]) 1535 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1536 1537 if (data[IFLA_IPTUN_PROTO]) 1538 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1539 1540 if (data[IFLA_IPTUN_FWMARK]) 1541 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1542 } 1543 1544 /* This function returns true when ENCAP attributes are present in the nl msg */ 1545 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1546 struct ip_tunnel_encap *ipencap) 1547 { 1548 bool ret = false; 1549 1550 memset(ipencap, 0, sizeof(*ipencap)); 1551 1552 if (!data) 1553 return ret; 1554 1555 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1556 ret = true; 1557 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1558 } 1559 1560 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1561 ret = true; 1562 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1563 } 1564 1565 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1566 ret = true; 1567 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1568 } 1569 1570 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1571 ret = true; 1572 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1573 } 1574 1575 return ret; 1576 } 1577 1578 #ifdef CONFIG_IPV6_SIT_6RD 1579 /* This function returns true when 6RD attributes are present in the nl msg */ 1580 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1581 struct ip_tunnel_6rd *ip6rd) 1582 { 1583 bool ret = false; 1584 memset(ip6rd, 0, sizeof(*ip6rd)); 1585 1586 if (!data) 1587 return ret; 1588 1589 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1590 ret = true; 1591 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1592 } 1593 1594 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1595 ret = true; 1596 ip6rd->relay_prefix = 1597 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1598 } 1599 1600 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1601 ret = true; 1602 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1603 } 1604 1605 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1606 ret = true; 1607 ip6rd->relay_prefixlen = 1608 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1609 } 1610 1611 return ret; 1612 } 1613 #endif 1614 1615 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1616 struct nlattr *tb[], struct nlattr *data[], 1617 struct netlink_ext_ack *extack) 1618 { 1619 struct net *net = dev_net(dev); 1620 struct ip_tunnel *nt; 1621 struct ip_tunnel_encap ipencap; 1622 #ifdef CONFIG_IPV6_SIT_6RD 1623 struct ip_tunnel_6rd ip6rd; 1624 #endif 1625 int err; 1626 1627 nt = netdev_priv(dev); 1628 1629 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1630 err = ip_tunnel_encap_setup(nt, &ipencap); 1631 if (err < 0) 1632 return err; 1633 } 1634 1635 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1636 1637 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1638 return -EEXIST; 1639 1640 err = ipip6_tunnel_create(dev); 1641 if (err < 0) 1642 return err; 1643 1644 if (tb[IFLA_MTU]) { 1645 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1646 1647 if (mtu >= IPV6_MIN_MTU && 1648 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1649 dev->mtu = mtu; 1650 } 1651 1652 #ifdef CONFIG_IPV6_SIT_6RD 1653 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1654 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1655 if (err < 0) 1656 unregister_netdevice_queue(dev, NULL); 1657 } 1658 #endif 1659 1660 return err; 1661 } 1662 1663 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1664 struct nlattr *data[], 1665 struct netlink_ext_ack *extack) 1666 { 1667 struct ip_tunnel *t = netdev_priv(dev); 1668 struct ip_tunnel_parm p; 1669 struct ip_tunnel_encap ipencap; 1670 struct net *net = t->net; 1671 struct sit_net *sitn = net_generic(net, sit_net_id); 1672 #ifdef CONFIG_IPV6_SIT_6RD 1673 struct ip_tunnel_6rd ip6rd; 1674 #endif 1675 __u32 fwmark = t->fwmark; 1676 int err; 1677 1678 if (dev == sitn->fb_tunnel_dev) 1679 return -EINVAL; 1680 1681 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1682 err = ip_tunnel_encap_setup(t, &ipencap); 1683 if (err < 0) 1684 return err; 1685 } 1686 1687 ipip6_netlink_parms(data, &p, &fwmark); 1688 1689 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1690 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1691 return -EINVAL; 1692 1693 t = ipip6_tunnel_locate(net, &p, 0); 1694 1695 if (t) { 1696 if (t->dev != dev) 1697 return -EEXIST; 1698 } else 1699 t = netdev_priv(dev); 1700 1701 ipip6_tunnel_update(t, &p, fwmark); 1702 1703 #ifdef CONFIG_IPV6_SIT_6RD 1704 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1705 return ipip6_tunnel_update_6rd(t, &ip6rd); 1706 #endif 1707 1708 return 0; 1709 } 1710 1711 static size_t ipip6_get_size(const struct net_device *dev) 1712 { 1713 return 1714 /* IFLA_IPTUN_LINK */ 1715 nla_total_size(4) + 1716 /* IFLA_IPTUN_LOCAL */ 1717 nla_total_size(4) + 1718 /* IFLA_IPTUN_REMOTE */ 1719 nla_total_size(4) + 1720 /* IFLA_IPTUN_TTL */ 1721 nla_total_size(1) + 1722 /* IFLA_IPTUN_TOS */ 1723 nla_total_size(1) + 1724 /* IFLA_IPTUN_PMTUDISC */ 1725 nla_total_size(1) + 1726 /* IFLA_IPTUN_FLAGS */ 1727 nla_total_size(2) + 1728 /* IFLA_IPTUN_PROTO */ 1729 nla_total_size(1) + 1730 #ifdef CONFIG_IPV6_SIT_6RD 1731 /* IFLA_IPTUN_6RD_PREFIX */ 1732 nla_total_size(sizeof(struct in6_addr)) + 1733 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1734 nla_total_size(4) + 1735 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1736 nla_total_size(2) + 1737 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1738 nla_total_size(2) + 1739 #endif 1740 /* IFLA_IPTUN_ENCAP_TYPE */ 1741 nla_total_size(2) + 1742 /* IFLA_IPTUN_ENCAP_FLAGS */ 1743 nla_total_size(2) + 1744 /* IFLA_IPTUN_ENCAP_SPORT */ 1745 nla_total_size(2) + 1746 /* IFLA_IPTUN_ENCAP_DPORT */ 1747 nla_total_size(2) + 1748 /* IFLA_IPTUN_FWMARK */ 1749 nla_total_size(4) + 1750 0; 1751 } 1752 1753 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1754 { 1755 struct ip_tunnel *tunnel = netdev_priv(dev); 1756 struct ip_tunnel_parm *parm = &tunnel->parms; 1757 1758 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1759 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1760 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1761 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1762 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1763 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1764 !!(parm->iph.frag_off & htons(IP_DF))) || 1765 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1766 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1767 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1768 goto nla_put_failure; 1769 1770 #ifdef CONFIG_IPV6_SIT_6RD 1771 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1772 &tunnel->ip6rd.prefix) || 1773 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1774 tunnel->ip6rd.relay_prefix) || 1775 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1776 tunnel->ip6rd.prefixlen) || 1777 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1778 tunnel->ip6rd.relay_prefixlen)) 1779 goto nla_put_failure; 1780 #endif 1781 1782 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1783 tunnel->encap.type) || 1784 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1785 tunnel->encap.sport) || 1786 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1787 tunnel->encap.dport) || 1788 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1789 tunnel->encap.flags)) 1790 goto nla_put_failure; 1791 1792 return 0; 1793 1794 nla_put_failure: 1795 return -EMSGSIZE; 1796 } 1797 1798 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1799 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1800 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1801 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1802 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1803 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1804 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1805 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1806 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1807 #ifdef CONFIG_IPV6_SIT_6RD 1808 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1809 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1810 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1811 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1812 #endif 1813 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1814 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1815 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1816 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1817 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1818 }; 1819 1820 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1821 { 1822 struct net *net = dev_net(dev); 1823 struct sit_net *sitn = net_generic(net, sit_net_id); 1824 1825 if (dev != sitn->fb_tunnel_dev) 1826 unregister_netdevice_queue(dev, head); 1827 } 1828 1829 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1830 .kind = "sit", 1831 .maxtype = IFLA_IPTUN_MAX, 1832 .policy = ipip6_policy, 1833 .priv_size = sizeof(struct ip_tunnel), 1834 .setup = ipip6_tunnel_setup, 1835 .validate = ipip6_validate, 1836 .newlink = ipip6_newlink, 1837 .changelink = ipip6_changelink, 1838 .get_size = ipip6_get_size, 1839 .fill_info = ipip6_fill_info, 1840 .dellink = ipip6_dellink, 1841 .get_link_net = ip_tunnel_get_link_net, 1842 }; 1843 1844 static struct xfrm_tunnel sit_handler __read_mostly = { 1845 .handler = ipip6_rcv, 1846 .err_handler = ipip6_err, 1847 .priority = 1, 1848 }; 1849 1850 static struct xfrm_tunnel ipip_handler __read_mostly = { 1851 .handler = ipip_rcv, 1852 .err_handler = ipip6_err, 1853 .priority = 2, 1854 }; 1855 1856 #if IS_ENABLED(CONFIG_MPLS) 1857 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1858 .handler = mplsip_rcv, 1859 .err_handler = ipip6_err, 1860 .priority = 2, 1861 }; 1862 #endif 1863 1864 static void __net_exit sit_destroy_tunnels(struct net *net, 1865 struct list_head *head) 1866 { 1867 struct sit_net *sitn = net_generic(net, sit_net_id); 1868 struct net_device *dev, *aux; 1869 int prio; 1870 1871 for_each_netdev_safe(net, dev, aux) 1872 if (dev->rtnl_link_ops == &sit_link_ops) 1873 unregister_netdevice_queue(dev, head); 1874 1875 for (prio = 0; prio < 4; prio++) { 1876 int h; 1877 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1878 struct ip_tunnel *t; 1879 1880 t = rtnl_dereference(sitn->tunnels[prio][h]); 1881 while (t) { 1882 /* If dev is in the same netns, it has already 1883 * been added to the list by the previous loop. 1884 */ 1885 if (!net_eq(dev_net(t->dev), net)) 1886 unregister_netdevice_queue(t->dev, 1887 head); 1888 t = rtnl_dereference(t->next); 1889 } 1890 } 1891 } 1892 } 1893 1894 static int __net_init sit_init_net(struct net *net) 1895 { 1896 struct sit_net *sitn = net_generic(net, sit_net_id); 1897 struct ip_tunnel *t; 1898 int err; 1899 1900 sitn->tunnels[0] = sitn->tunnels_wc; 1901 sitn->tunnels[1] = sitn->tunnels_l; 1902 sitn->tunnels[2] = sitn->tunnels_r; 1903 sitn->tunnels[3] = sitn->tunnels_r_l; 1904 1905 if (!net_has_fallback_tunnels(net)) 1906 return 0; 1907 1908 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1909 NET_NAME_UNKNOWN, 1910 ipip6_tunnel_setup); 1911 if (!sitn->fb_tunnel_dev) { 1912 err = -ENOMEM; 1913 goto err_alloc_dev; 1914 } 1915 dev_net_set(sitn->fb_tunnel_dev, net); 1916 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1917 /* FB netdevice is special: we have one, and only one per netns. 1918 * Allowing to move it to another netns is clearly unsafe. 1919 */ 1920 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1921 1922 err = register_netdev(sitn->fb_tunnel_dev); 1923 if (err) 1924 goto err_reg_dev; 1925 1926 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1927 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1928 1929 t = netdev_priv(sitn->fb_tunnel_dev); 1930 1931 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1932 return 0; 1933 1934 err_reg_dev: 1935 ipip6_dev_free(sitn->fb_tunnel_dev); 1936 free_netdev(sitn->fb_tunnel_dev); 1937 err_alloc_dev: 1938 return err; 1939 } 1940 1941 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1942 { 1943 LIST_HEAD(list); 1944 struct net *net; 1945 1946 rtnl_lock(); 1947 list_for_each_entry(net, net_list, exit_list) 1948 sit_destroy_tunnels(net, &list); 1949 1950 unregister_netdevice_many(&list); 1951 rtnl_unlock(); 1952 } 1953 1954 static struct pernet_operations sit_net_ops = { 1955 .init = sit_init_net, 1956 .exit_batch = sit_exit_batch_net, 1957 .id = &sit_net_id, 1958 .size = sizeof(struct sit_net), 1959 }; 1960 1961 static void __exit sit_cleanup(void) 1962 { 1963 rtnl_link_unregister(&sit_link_ops); 1964 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1965 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1966 #if IS_ENABLED(CONFIG_MPLS) 1967 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1968 #endif 1969 1970 unregister_pernet_device(&sit_net_ops); 1971 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1972 } 1973 1974 static int __init sit_init(void) 1975 { 1976 int err; 1977 1978 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1979 1980 err = register_pernet_device(&sit_net_ops); 1981 if (err < 0) 1982 return err; 1983 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1984 if (err < 0) { 1985 pr_info("%s: can't register ip6ip4\n", __func__); 1986 goto xfrm_tunnel_failed; 1987 } 1988 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1989 if (err < 0) { 1990 pr_info("%s: can't register ip4ip4\n", __func__); 1991 goto xfrm_tunnel4_failed; 1992 } 1993 #if IS_ENABLED(CONFIG_MPLS) 1994 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1995 if (err < 0) { 1996 pr_info("%s: can't register mplsip\n", __func__); 1997 goto xfrm_tunnel_mpls_failed; 1998 } 1999 #endif 2000 err = rtnl_link_register(&sit_link_ops); 2001 if (err < 0) 2002 goto rtnl_link_failed; 2003 2004 out: 2005 return err; 2006 2007 rtnl_link_failed: 2008 #if IS_ENABLED(CONFIG_MPLS) 2009 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 2010 xfrm_tunnel_mpls_failed: 2011 #endif 2012 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 2013 xfrm_tunnel4_failed: 2014 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 2015 xfrm_tunnel_failed: 2016 unregister_pernet_device(&sit_net_ops); 2017 goto out; 2018 } 2019 2020 module_init(sit_init); 2021 module_exit(sit_cleanup); 2022 MODULE_LICENSE("GPL"); 2023 MODULE_ALIAS_RTNL_LINK("sit"); 2024 MODULE_ALIAS_NETDEV("sit0"); 2025