1 /* 2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * Changes: 15 * Roger Venning <r.venning@telstra.com>: 6to4 support 16 * Nate Thompson <nate@thebog.net>: 6to4 support 17 * Fred Templin <fred.l.templin@boeing.com>: isatap support 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/capability.h> 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/icmp.h> 33 #include <linux/slab.h> 34 #include <asm/uaccess.h> 35 #include <linux/init.h> 36 #include <linux/netfilter_ipv4.h> 37 #include <linux/if_ether.h> 38 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/protocol.h> 44 #include <net/transp_v6.h> 45 #include <net/ip6_fib.h> 46 #include <net/ip6_route.h> 47 #include <net/ndisc.h> 48 #include <net/addrconf.h> 49 #include <net/ip.h> 50 #include <net/udp.h> 51 #include <net/icmp.h> 52 #include <net/ipip.h> 53 #include <net/inet_ecn.h> 54 #include <net/xfrm.h> 55 #include <net/dsfield.h> 56 #include <net/net_namespace.h> 57 #include <net/netns/generic.h> 58 59 /* 60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 61 62 For comments look at net/ipv4/ip_gre.c --ANK 63 */ 64 65 #define HASH_SIZE 16 66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 67 68 static bool log_ecn_error = true; 69 module_param(log_ecn_error, bool, 0644); 70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 71 72 static int ipip6_tunnel_init(struct net_device *dev); 73 static void ipip6_tunnel_setup(struct net_device *dev); 74 static void ipip6_dev_free(struct net_device *dev); 75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 76 __be32 *v4dst); 77 static struct rtnl_link_ops sit_link_ops __read_mostly; 78 79 static int sit_net_id __read_mostly; 80 struct sit_net { 81 struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE]; 82 struct ip_tunnel __rcu *tunnels_r[HASH_SIZE]; 83 struct ip_tunnel __rcu *tunnels_l[HASH_SIZE]; 84 struct ip_tunnel __rcu *tunnels_wc[1]; 85 struct ip_tunnel __rcu **tunnels[4]; 86 87 struct net_device *fb_tunnel_dev; 88 }; 89 90 static struct rtnl_link_stats64 *ipip6_get_stats64(struct net_device *dev, 91 struct rtnl_link_stats64 *tot) 92 { 93 int i; 94 95 for_each_possible_cpu(i) { 96 const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i); 97 u64 rx_packets, rx_bytes, tx_packets, tx_bytes; 98 unsigned int start; 99 100 do { 101 start = u64_stats_fetch_begin_bh(&tstats->syncp); 102 rx_packets = tstats->rx_packets; 103 tx_packets = tstats->tx_packets; 104 rx_bytes = tstats->rx_bytes; 105 tx_bytes = tstats->tx_bytes; 106 } while (u64_stats_fetch_retry_bh(&tstats->syncp, start)); 107 108 tot->rx_packets += rx_packets; 109 tot->tx_packets += tx_packets; 110 tot->rx_bytes += rx_bytes; 111 tot->tx_bytes += tx_bytes; 112 } 113 114 tot->rx_errors = dev->stats.rx_errors; 115 tot->rx_frame_errors = dev->stats.rx_frame_errors; 116 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 117 tot->tx_carrier_errors = dev->stats.tx_carrier_errors; 118 tot->tx_dropped = dev->stats.tx_dropped; 119 tot->tx_aborted_errors = dev->stats.tx_aborted_errors; 120 tot->tx_errors = dev->stats.tx_errors; 121 122 return tot; 123 } 124 125 /* 126 * Must be invoked with rcu_read_lock 127 */ 128 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 129 struct net_device *dev, __be32 remote, __be32 local) 130 { 131 unsigned int h0 = HASH(remote); 132 unsigned int h1 = HASH(local); 133 struct ip_tunnel *t; 134 struct sit_net *sitn = net_generic(net, sit_net_id); 135 136 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 137 if (local == t->parms.iph.saddr && 138 remote == t->parms.iph.daddr && 139 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 140 (t->dev->flags & IFF_UP)) 141 return t; 142 } 143 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 144 if (remote == t->parms.iph.daddr && 145 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 146 (t->dev->flags & IFF_UP)) 147 return t; 148 } 149 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 150 if (local == t->parms.iph.saddr && 151 (!dev || !t->parms.link || dev->iflink == t->parms.link) && 152 (t->dev->flags & IFF_UP)) 153 return t; 154 } 155 t = rcu_dereference(sitn->tunnels_wc[0]); 156 if ((t != NULL) && (t->dev->flags & IFF_UP)) 157 return t; 158 return NULL; 159 } 160 161 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 162 struct ip_tunnel_parm *parms) 163 { 164 __be32 remote = parms->iph.daddr; 165 __be32 local = parms->iph.saddr; 166 unsigned int h = 0; 167 int prio = 0; 168 169 if (remote) { 170 prio |= 2; 171 h ^= HASH(remote); 172 } 173 if (local) { 174 prio |= 1; 175 h ^= HASH(local); 176 } 177 return &sitn->tunnels[prio][h]; 178 } 179 180 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 181 struct ip_tunnel *t) 182 { 183 return __ipip6_bucket(sitn, &t->parms); 184 } 185 186 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 187 { 188 struct ip_tunnel __rcu **tp; 189 struct ip_tunnel *iter; 190 191 for (tp = ipip6_bucket(sitn, t); 192 (iter = rtnl_dereference(*tp)) != NULL; 193 tp = &iter->next) { 194 if (t == iter) { 195 rcu_assign_pointer(*tp, t->next); 196 break; 197 } 198 } 199 } 200 201 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 202 { 203 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 204 205 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 206 rcu_assign_pointer(*tp, t); 207 } 208 209 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 210 { 211 #ifdef CONFIG_IPV6_SIT_6RD 212 struct ip_tunnel *t = netdev_priv(dev); 213 214 if (t->dev == sitn->fb_tunnel_dev) { 215 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 216 t->ip6rd.relay_prefix = 0; 217 t->ip6rd.prefixlen = 16; 218 t->ip6rd.relay_prefixlen = 0; 219 } else { 220 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 221 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 222 } 223 #endif 224 } 225 226 static int ipip6_tunnel_create(struct net_device *dev) 227 { 228 struct ip_tunnel *t = netdev_priv(dev); 229 struct net *net = dev_net(dev); 230 struct sit_net *sitn = net_generic(net, sit_net_id); 231 int err; 232 233 err = ipip6_tunnel_init(dev); 234 if (err < 0) 235 goto out; 236 ipip6_tunnel_clone_6rd(dev, sitn); 237 238 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 239 dev->priv_flags |= IFF_ISATAP; 240 241 err = register_netdevice(dev); 242 if (err < 0) 243 goto out; 244 245 strcpy(t->parms.name, dev->name); 246 dev->rtnl_link_ops = &sit_link_ops; 247 248 dev_hold(dev); 249 250 ipip6_tunnel_link(sitn, t); 251 return 0; 252 253 out: 254 return err; 255 } 256 257 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 258 struct ip_tunnel_parm *parms, int create) 259 { 260 __be32 remote = parms->iph.daddr; 261 __be32 local = parms->iph.saddr; 262 struct ip_tunnel *t, *nt; 263 struct ip_tunnel __rcu **tp; 264 struct net_device *dev; 265 char name[IFNAMSIZ]; 266 struct sit_net *sitn = net_generic(net, sit_net_id); 267 268 for (tp = __ipip6_bucket(sitn, parms); 269 (t = rtnl_dereference(*tp)) != NULL; 270 tp = &t->next) { 271 if (local == t->parms.iph.saddr && 272 remote == t->parms.iph.daddr && 273 parms->link == t->parms.link) { 274 if (create) 275 return NULL; 276 else 277 return t; 278 } 279 } 280 if (!create) 281 goto failed; 282 283 if (parms->name[0]) 284 strlcpy(name, parms->name, IFNAMSIZ); 285 else 286 strcpy(name, "sit%d"); 287 288 dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup); 289 if (dev == NULL) 290 return NULL; 291 292 dev_net_set(dev, net); 293 294 nt = netdev_priv(dev); 295 296 nt->parms = *parms; 297 if (ipip6_tunnel_create(dev) < 0) 298 goto failed_free; 299 300 return nt; 301 302 failed_free: 303 ipip6_dev_free(dev); 304 failed: 305 return NULL; 306 } 307 308 #define for_each_prl_rcu(start) \ 309 for (prl = rcu_dereference(start); \ 310 prl; \ 311 prl = rcu_dereference(prl->next)) 312 313 static struct ip_tunnel_prl_entry * 314 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 315 { 316 struct ip_tunnel_prl_entry *prl; 317 318 for_each_prl_rcu(t->prl) 319 if (prl->addr == addr) 320 break; 321 return prl; 322 323 } 324 325 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, 326 struct ip_tunnel_prl __user *a) 327 { 328 struct ip_tunnel_prl kprl, *kp; 329 struct ip_tunnel_prl_entry *prl; 330 unsigned int cmax, c = 0, ca, len; 331 int ret = 0; 332 333 if (copy_from_user(&kprl, a, sizeof(kprl))) 334 return -EFAULT; 335 cmax = kprl.datalen / sizeof(kprl); 336 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 337 cmax = 1; 338 339 /* For simple GET or for root users, 340 * we try harder to allocate. 341 */ 342 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 343 kcalloc(cmax, sizeof(*kp), GFP_KERNEL) : 344 NULL; 345 346 rcu_read_lock(); 347 348 ca = t->prl_count < cmax ? t->prl_count : cmax; 349 350 if (!kp) { 351 /* We don't try hard to allocate much memory for 352 * non-root users. 353 * For root users, retry allocating enough memory for 354 * the answer. 355 */ 356 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 357 if (!kp) { 358 ret = -ENOMEM; 359 goto out; 360 } 361 } 362 363 c = 0; 364 for_each_prl_rcu(t->prl) { 365 if (c >= cmax) 366 break; 367 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 368 continue; 369 kp[c].addr = prl->addr; 370 kp[c].flags = prl->flags; 371 c++; 372 if (kprl.addr != htonl(INADDR_ANY)) 373 break; 374 } 375 out: 376 rcu_read_unlock(); 377 378 len = sizeof(*kp) * c; 379 ret = 0; 380 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 381 ret = -EFAULT; 382 383 kfree(kp); 384 385 return ret; 386 } 387 388 static int 389 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 390 { 391 struct ip_tunnel_prl_entry *p; 392 int err = 0; 393 394 if (a->addr == htonl(INADDR_ANY)) 395 return -EINVAL; 396 397 ASSERT_RTNL(); 398 399 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 400 if (p->addr == a->addr) { 401 if (chg) { 402 p->flags = a->flags; 403 goto out; 404 } 405 err = -EEXIST; 406 goto out; 407 } 408 } 409 410 if (chg) { 411 err = -ENXIO; 412 goto out; 413 } 414 415 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 416 if (!p) { 417 err = -ENOBUFS; 418 goto out; 419 } 420 421 p->next = t->prl; 422 p->addr = a->addr; 423 p->flags = a->flags; 424 t->prl_count++; 425 rcu_assign_pointer(t->prl, p); 426 out: 427 return err; 428 } 429 430 static void prl_list_destroy_rcu(struct rcu_head *head) 431 { 432 struct ip_tunnel_prl_entry *p, *n; 433 434 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 435 do { 436 n = rcu_dereference_protected(p->next, 1); 437 kfree(p); 438 p = n; 439 } while (p); 440 } 441 442 static int 443 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 444 { 445 struct ip_tunnel_prl_entry *x; 446 struct ip_tunnel_prl_entry __rcu **p; 447 int err = 0; 448 449 ASSERT_RTNL(); 450 451 if (a && a->addr != htonl(INADDR_ANY)) { 452 for (p = &t->prl; 453 (x = rtnl_dereference(*p)) != NULL; 454 p = &x->next) { 455 if (x->addr == a->addr) { 456 *p = x->next; 457 kfree_rcu(x, rcu_head); 458 t->prl_count--; 459 goto out; 460 } 461 } 462 err = -ENXIO; 463 } else { 464 x = rtnl_dereference(t->prl); 465 if (x) { 466 t->prl_count = 0; 467 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 468 t->prl = NULL; 469 } 470 } 471 out: 472 return err; 473 } 474 475 static int 476 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 477 { 478 struct ip_tunnel_prl_entry *p; 479 int ok = 1; 480 481 rcu_read_lock(); 482 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 483 if (p) { 484 if (p->flags & PRL_DEFAULT) 485 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 486 else 487 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 488 } else { 489 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 490 491 if (ipv6_addr_is_isatap(addr6) && 492 (addr6->s6_addr32[3] == iph->saddr) && 493 ipv6_chk_prefix(addr6, t->dev)) 494 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 495 else 496 ok = 0; 497 } 498 rcu_read_unlock(); 499 return ok; 500 } 501 502 static void ipip6_tunnel_uninit(struct net_device *dev) 503 { 504 struct net *net = dev_net(dev); 505 struct sit_net *sitn = net_generic(net, sit_net_id); 506 507 if (dev == sitn->fb_tunnel_dev) { 508 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 509 } else { 510 ipip6_tunnel_unlink(sitn, netdev_priv(dev)); 511 ipip6_tunnel_del_prl(netdev_priv(dev), NULL); 512 } 513 dev_put(dev); 514 } 515 516 517 static int ipip6_err(struct sk_buff *skb, u32 info) 518 { 519 520 /* All the routers (except for Linux) return only 521 8 bytes of packet payload. It means, that precise relaying of 522 ICMP in the real Internet is absolutely infeasible. 523 */ 524 const struct iphdr *iph = (const struct iphdr *)skb->data; 525 const int type = icmp_hdr(skb)->type; 526 const int code = icmp_hdr(skb)->code; 527 struct ip_tunnel *t; 528 int err; 529 530 switch (type) { 531 default: 532 case ICMP_PARAMETERPROB: 533 return 0; 534 535 case ICMP_DEST_UNREACH: 536 switch (code) { 537 case ICMP_SR_FAILED: 538 case ICMP_PORT_UNREACH: 539 /* Impossible event. */ 540 return 0; 541 default: 542 /* All others are translated to HOST_UNREACH. 543 rfc2003 contains "deep thoughts" about NET_UNREACH, 544 I believe they are just ether pollution. --ANK 545 */ 546 break; 547 } 548 break; 549 case ICMP_TIME_EXCEEDED: 550 if (code != ICMP_EXC_TTL) 551 return 0; 552 break; 553 case ICMP_REDIRECT: 554 break; 555 } 556 557 err = -ENOENT; 558 559 t = ipip6_tunnel_lookup(dev_net(skb->dev), 560 skb->dev, 561 iph->daddr, 562 iph->saddr); 563 if (t == NULL) 564 goto out; 565 566 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 567 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 568 t->dev->ifindex, 0, IPPROTO_IPV6, 0); 569 err = 0; 570 goto out; 571 } 572 if (type == ICMP_REDIRECT) { 573 ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0, 574 IPPROTO_IPV6, 0); 575 err = 0; 576 goto out; 577 } 578 579 if (t->parms.iph.daddr == 0) 580 goto out; 581 582 err = 0; 583 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 584 goto out; 585 586 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 587 t->err_count++; 588 else 589 t->err_count = 1; 590 t->err_time = jiffies; 591 out: 592 return err; 593 } 594 595 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 596 const struct in6_addr *v6addr) 597 { 598 __be32 v4embed = 0; 599 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 600 return true; 601 return false; 602 } 603 604 static int ipip6_rcv(struct sk_buff *skb) 605 { 606 const struct iphdr *iph = ip_hdr(skb); 607 struct ip_tunnel *tunnel; 608 int err; 609 610 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 611 iph->saddr, iph->daddr); 612 if (tunnel != NULL) { 613 struct pcpu_tstats *tstats; 614 615 secpath_reset(skb); 616 skb->mac_header = skb->network_header; 617 skb_reset_network_header(skb); 618 IPCB(skb)->flags = 0; 619 skb->protocol = htons(ETH_P_IPV6); 620 skb->pkt_type = PACKET_HOST; 621 622 if (tunnel->dev->priv_flags & IFF_ISATAP) { 623 if (!isatap_chksrc(skb, iph, tunnel)) { 624 tunnel->dev->stats.rx_errors++; 625 goto out; 626 } 627 } else { 628 if (is_spoofed_6rd(tunnel, iph->saddr, 629 &ipv6_hdr(skb)->saddr) || 630 is_spoofed_6rd(tunnel, iph->daddr, 631 &ipv6_hdr(skb)->daddr)) { 632 tunnel->dev->stats.rx_errors++; 633 goto out; 634 } 635 } 636 637 __skb_tunnel_rx(skb, tunnel->dev); 638 639 err = IP_ECN_decapsulate(iph, skb); 640 if (unlikely(err)) { 641 if (log_ecn_error) 642 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 643 &iph->saddr, iph->tos); 644 if (err > 1) { 645 ++tunnel->dev->stats.rx_frame_errors; 646 ++tunnel->dev->stats.rx_errors; 647 goto out; 648 } 649 } 650 651 tstats = this_cpu_ptr(tunnel->dev->tstats); 652 tstats->rx_packets++; 653 tstats->rx_bytes += skb->len; 654 655 netif_rx(skb); 656 657 return 0; 658 } 659 660 /* no tunnel matched, let upstream know, ipsec may handle it */ 661 return 1; 662 out: 663 kfree_skb(skb); 664 return 0; 665 } 666 667 /* 668 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 669 * stores the embedded IPv4 address in v4dst and returns true. 670 */ 671 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 672 __be32 *v4dst) 673 { 674 #ifdef CONFIG_IPV6_SIT_6RD 675 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 676 tunnel->ip6rd.prefixlen)) { 677 unsigned int pbw0, pbi0; 678 int pbi1; 679 u32 d; 680 681 pbw0 = tunnel->ip6rd.prefixlen >> 5; 682 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 683 684 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 685 tunnel->ip6rd.relay_prefixlen; 686 687 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 688 if (pbi1 > 0) 689 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 690 (32 - pbi1); 691 692 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 693 return true; 694 } 695 #else 696 if (v6dst->s6_addr16[0] == htons(0x2002)) { 697 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 698 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 699 return true; 700 } 701 #endif 702 return false; 703 } 704 705 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 706 const struct in6_addr *v6dst) 707 { 708 __be32 dst = 0; 709 check_6rd(tunnel, v6dst, &dst); 710 return dst; 711 } 712 713 /* 714 * This function assumes it is being called from dev_queue_xmit() 715 * and that skb is filled properly by that function. 716 */ 717 718 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 719 struct net_device *dev) 720 { 721 struct ip_tunnel *tunnel = netdev_priv(dev); 722 const struct iphdr *tiph = &tunnel->parms.iph; 723 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 724 u8 tos = tunnel->parms.iph.tos; 725 __be16 df = tiph->frag_off; 726 struct rtable *rt; /* Route to the other host */ 727 struct net_device *tdev; /* Device to other host */ 728 struct iphdr *iph; /* Our new IP header */ 729 unsigned int max_headroom; /* The extra header space needed */ 730 __be32 dst = tiph->daddr; 731 struct flowi4 fl4; 732 int mtu; 733 const struct in6_addr *addr6; 734 int addr_type; 735 736 if (skb->protocol != htons(ETH_P_IPV6)) 737 goto tx_error; 738 739 if (tos == 1) 740 tos = ipv6_get_dsfield(iph6); 741 742 /* ISATAP (RFC4214) - must come before 6to4 */ 743 if (dev->priv_flags & IFF_ISATAP) { 744 struct neighbour *neigh = NULL; 745 bool do_tx_error = false; 746 747 if (skb_dst(skb)) 748 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 749 750 if (neigh == NULL) { 751 net_dbg_ratelimited("sit: nexthop == NULL\n"); 752 goto tx_error; 753 } 754 755 addr6 = (const struct in6_addr *)&neigh->primary_key; 756 addr_type = ipv6_addr_type(addr6); 757 758 if ((addr_type & IPV6_ADDR_UNICAST) && 759 ipv6_addr_is_isatap(addr6)) 760 dst = addr6->s6_addr32[3]; 761 else 762 do_tx_error = true; 763 764 neigh_release(neigh); 765 if (do_tx_error) 766 goto tx_error; 767 } 768 769 if (!dst) 770 dst = try_6rd(tunnel, &iph6->daddr); 771 772 if (!dst) { 773 struct neighbour *neigh = NULL; 774 bool do_tx_error = false; 775 776 if (skb_dst(skb)) 777 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 778 779 if (neigh == NULL) { 780 net_dbg_ratelimited("sit: nexthop == NULL\n"); 781 goto tx_error; 782 } 783 784 addr6 = (const struct in6_addr *)&neigh->primary_key; 785 addr_type = ipv6_addr_type(addr6); 786 787 if (addr_type == IPV6_ADDR_ANY) { 788 addr6 = &ipv6_hdr(skb)->daddr; 789 addr_type = ipv6_addr_type(addr6); 790 } 791 792 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 793 dst = addr6->s6_addr32[3]; 794 else 795 do_tx_error = true; 796 797 neigh_release(neigh); 798 if (do_tx_error) 799 goto tx_error; 800 } 801 802 rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, 803 dst, tiph->saddr, 804 0, 0, 805 IPPROTO_IPV6, RT_TOS(tos), 806 tunnel->parms.link); 807 if (IS_ERR(rt)) { 808 dev->stats.tx_carrier_errors++; 809 goto tx_error_icmp; 810 } 811 if (rt->rt_type != RTN_UNICAST) { 812 ip_rt_put(rt); 813 dev->stats.tx_carrier_errors++; 814 goto tx_error_icmp; 815 } 816 tdev = rt->dst.dev; 817 818 if (tdev == dev) { 819 ip_rt_put(rt); 820 dev->stats.collisions++; 821 goto tx_error; 822 } 823 824 if (df) { 825 mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr); 826 827 if (mtu < 68) { 828 dev->stats.collisions++; 829 ip_rt_put(rt); 830 goto tx_error; 831 } 832 833 if (mtu < IPV6_MIN_MTU) { 834 mtu = IPV6_MIN_MTU; 835 df = 0; 836 } 837 838 if (tunnel->parms.iph.daddr && skb_dst(skb)) 839 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 840 841 if (skb->len > mtu) { 842 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 843 ip_rt_put(rt); 844 goto tx_error; 845 } 846 } 847 848 if (tunnel->err_count > 0) { 849 if (time_before(jiffies, 850 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 851 tunnel->err_count--; 852 dst_link_failure(skb); 853 } else 854 tunnel->err_count = 0; 855 } 856 857 /* 858 * Okay, now see if we can stuff it in the buffer as-is. 859 */ 860 max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); 861 862 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 863 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 864 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 865 if (!new_skb) { 866 ip_rt_put(rt); 867 dev->stats.tx_dropped++; 868 dev_kfree_skb(skb); 869 return NETDEV_TX_OK; 870 } 871 if (skb->sk) 872 skb_set_owner_w(new_skb, skb->sk); 873 dev_kfree_skb(skb); 874 skb = new_skb; 875 iph6 = ipv6_hdr(skb); 876 } 877 878 skb->transport_header = skb->network_header; 879 skb_push(skb, sizeof(struct iphdr)); 880 skb_reset_network_header(skb); 881 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 882 IPCB(skb)->flags = 0; 883 skb_dst_drop(skb); 884 skb_dst_set(skb, &rt->dst); 885 886 /* 887 * Push down and install the IPIP header. 888 */ 889 890 iph = ip_hdr(skb); 891 iph->version = 4; 892 iph->ihl = sizeof(struct iphdr)>>2; 893 iph->frag_off = df; 894 iph->protocol = IPPROTO_IPV6; 895 iph->tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 896 iph->daddr = fl4.daddr; 897 iph->saddr = fl4.saddr; 898 899 if ((iph->ttl = tiph->ttl) == 0) 900 iph->ttl = iph6->hop_limit; 901 902 iptunnel_xmit(skb, dev); 903 return NETDEV_TX_OK; 904 905 tx_error_icmp: 906 dst_link_failure(skb); 907 tx_error: 908 dev->stats.tx_errors++; 909 dev_kfree_skb(skb); 910 return NETDEV_TX_OK; 911 } 912 913 static void ipip6_tunnel_bind_dev(struct net_device *dev) 914 { 915 struct net_device *tdev = NULL; 916 struct ip_tunnel *tunnel; 917 const struct iphdr *iph; 918 struct flowi4 fl4; 919 920 tunnel = netdev_priv(dev); 921 iph = &tunnel->parms.iph; 922 923 if (iph->daddr) { 924 struct rtable *rt = ip_route_output_ports(dev_net(dev), &fl4, NULL, 925 iph->daddr, iph->saddr, 926 0, 0, 927 IPPROTO_IPV6, 928 RT_TOS(iph->tos), 929 tunnel->parms.link); 930 931 if (!IS_ERR(rt)) { 932 tdev = rt->dst.dev; 933 ip_rt_put(rt); 934 } 935 dev->flags |= IFF_POINTOPOINT; 936 } 937 938 if (!tdev && tunnel->parms.link) 939 tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link); 940 941 if (tdev) { 942 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 943 dev->mtu = tdev->mtu - sizeof(struct iphdr); 944 if (dev->mtu < IPV6_MIN_MTU) 945 dev->mtu = IPV6_MIN_MTU; 946 } 947 dev->iflink = tunnel->parms.link; 948 } 949 950 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p) 951 { 952 struct net *net = dev_net(t->dev); 953 struct sit_net *sitn = net_generic(net, sit_net_id); 954 955 ipip6_tunnel_unlink(sitn, t); 956 synchronize_net(); 957 t->parms.iph.saddr = p->iph.saddr; 958 t->parms.iph.daddr = p->iph.daddr; 959 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 960 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 961 ipip6_tunnel_link(sitn, t); 962 t->parms.iph.ttl = p->iph.ttl; 963 t->parms.iph.tos = p->iph.tos; 964 if (t->parms.link != p->link) { 965 t->parms.link = p->link; 966 ipip6_tunnel_bind_dev(t->dev); 967 } 968 netdev_state_change(t->dev); 969 } 970 971 #ifdef CONFIG_IPV6_SIT_6RD 972 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 973 struct ip_tunnel_6rd *ip6rd) 974 { 975 struct in6_addr prefix; 976 __be32 relay_prefix; 977 978 if (ip6rd->relay_prefixlen > 32 || 979 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 980 return -EINVAL; 981 982 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 983 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 984 return -EINVAL; 985 if (ip6rd->relay_prefixlen) 986 relay_prefix = ip6rd->relay_prefix & 987 htonl(0xffffffffUL << 988 (32 - ip6rd->relay_prefixlen)); 989 else 990 relay_prefix = 0; 991 if (relay_prefix != ip6rd->relay_prefix) 992 return -EINVAL; 993 994 t->ip6rd.prefix = prefix; 995 t->ip6rd.relay_prefix = relay_prefix; 996 t->ip6rd.prefixlen = ip6rd->prefixlen; 997 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 998 netdev_state_change(t->dev); 999 return 0; 1000 } 1001 #endif 1002 1003 static int 1004 ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) 1005 { 1006 int err = 0; 1007 struct ip_tunnel_parm p; 1008 struct ip_tunnel_prl prl; 1009 struct ip_tunnel *t; 1010 struct net *net = dev_net(dev); 1011 struct sit_net *sitn = net_generic(net, sit_net_id); 1012 #ifdef CONFIG_IPV6_SIT_6RD 1013 struct ip_tunnel_6rd ip6rd; 1014 #endif 1015 1016 switch (cmd) { 1017 case SIOCGETTUNNEL: 1018 #ifdef CONFIG_IPV6_SIT_6RD 1019 case SIOCGET6RD: 1020 #endif 1021 t = NULL; 1022 if (dev == sitn->fb_tunnel_dev) { 1023 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1024 err = -EFAULT; 1025 break; 1026 } 1027 t = ipip6_tunnel_locate(net, &p, 0); 1028 } 1029 if (t == NULL) 1030 t = netdev_priv(dev); 1031 1032 err = -EFAULT; 1033 if (cmd == SIOCGETTUNNEL) { 1034 memcpy(&p, &t->parms, sizeof(p)); 1035 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1036 sizeof(p))) 1037 goto done; 1038 #ifdef CONFIG_IPV6_SIT_6RD 1039 } else { 1040 ip6rd.prefix = t->ip6rd.prefix; 1041 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1042 ip6rd.prefixlen = t->ip6rd.prefixlen; 1043 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1044 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1045 sizeof(ip6rd))) 1046 goto done; 1047 #endif 1048 } 1049 err = 0; 1050 break; 1051 1052 case SIOCADDTUNNEL: 1053 case SIOCCHGTUNNEL: 1054 err = -EPERM; 1055 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1056 goto done; 1057 1058 err = -EFAULT; 1059 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1060 goto done; 1061 1062 err = -EINVAL; 1063 if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 || 1064 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1065 goto done; 1066 if (p.iph.ttl) 1067 p.iph.frag_off |= htons(IP_DF); 1068 1069 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1070 1071 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1072 if (t != NULL) { 1073 if (t->dev != dev) { 1074 err = -EEXIST; 1075 break; 1076 } 1077 } else { 1078 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1079 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1080 err = -EINVAL; 1081 break; 1082 } 1083 t = netdev_priv(dev); 1084 } 1085 1086 ipip6_tunnel_update(t, &p); 1087 } 1088 1089 if (t) { 1090 err = 0; 1091 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1092 err = -EFAULT; 1093 } else 1094 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1095 break; 1096 1097 case SIOCDELTUNNEL: 1098 err = -EPERM; 1099 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1100 goto done; 1101 1102 if (dev == sitn->fb_tunnel_dev) { 1103 err = -EFAULT; 1104 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1105 goto done; 1106 err = -ENOENT; 1107 if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL) 1108 goto done; 1109 err = -EPERM; 1110 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1111 goto done; 1112 dev = t->dev; 1113 } 1114 unregister_netdevice(dev); 1115 err = 0; 1116 break; 1117 1118 case SIOCGETPRL: 1119 err = -EINVAL; 1120 if (dev == sitn->fb_tunnel_dev) 1121 goto done; 1122 err = -ENOENT; 1123 if (!(t = netdev_priv(dev))) 1124 goto done; 1125 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1126 break; 1127 1128 case SIOCADDPRL: 1129 case SIOCDELPRL: 1130 case SIOCCHGPRL: 1131 err = -EPERM; 1132 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1133 goto done; 1134 err = -EINVAL; 1135 if (dev == sitn->fb_tunnel_dev) 1136 goto done; 1137 err = -EFAULT; 1138 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1139 goto done; 1140 err = -ENOENT; 1141 if (!(t = netdev_priv(dev))) 1142 goto done; 1143 1144 switch (cmd) { 1145 case SIOCDELPRL: 1146 err = ipip6_tunnel_del_prl(t, &prl); 1147 break; 1148 case SIOCADDPRL: 1149 case SIOCCHGPRL: 1150 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1151 break; 1152 } 1153 netdev_state_change(dev); 1154 break; 1155 1156 #ifdef CONFIG_IPV6_SIT_6RD 1157 case SIOCADD6RD: 1158 case SIOCCHG6RD: 1159 case SIOCDEL6RD: 1160 err = -EPERM; 1161 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1162 goto done; 1163 1164 err = -EFAULT; 1165 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1166 sizeof(ip6rd))) 1167 goto done; 1168 1169 t = netdev_priv(dev); 1170 1171 if (cmd != SIOCDEL6RD) { 1172 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1173 if (err < 0) 1174 goto done; 1175 } else 1176 ipip6_tunnel_clone_6rd(dev, sitn); 1177 1178 err = 0; 1179 break; 1180 #endif 1181 1182 default: 1183 err = -EINVAL; 1184 } 1185 1186 done: 1187 return err; 1188 } 1189 1190 static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu) 1191 { 1192 if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr)) 1193 return -EINVAL; 1194 dev->mtu = new_mtu; 1195 return 0; 1196 } 1197 1198 static const struct net_device_ops ipip6_netdev_ops = { 1199 .ndo_uninit = ipip6_tunnel_uninit, 1200 .ndo_start_xmit = ipip6_tunnel_xmit, 1201 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1202 .ndo_change_mtu = ipip6_tunnel_change_mtu, 1203 .ndo_get_stats64= ipip6_get_stats64, 1204 }; 1205 1206 static void ipip6_dev_free(struct net_device *dev) 1207 { 1208 free_percpu(dev->tstats); 1209 free_netdev(dev); 1210 } 1211 1212 static void ipip6_tunnel_setup(struct net_device *dev) 1213 { 1214 dev->netdev_ops = &ipip6_netdev_ops; 1215 dev->destructor = ipip6_dev_free; 1216 1217 dev->type = ARPHRD_SIT; 1218 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr); 1219 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr); 1220 dev->flags = IFF_NOARP; 1221 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1222 dev->iflink = 0; 1223 dev->addr_len = 4; 1224 dev->features |= NETIF_F_NETNS_LOCAL; 1225 dev->features |= NETIF_F_LLTX; 1226 } 1227 1228 static int ipip6_tunnel_init(struct net_device *dev) 1229 { 1230 struct ip_tunnel *tunnel = netdev_priv(dev); 1231 1232 tunnel->dev = dev; 1233 1234 memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); 1235 memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); 1236 1237 ipip6_tunnel_bind_dev(dev); 1238 dev->tstats = alloc_percpu(struct pcpu_tstats); 1239 if (!dev->tstats) 1240 return -ENOMEM; 1241 1242 return 0; 1243 } 1244 1245 static int __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1246 { 1247 struct ip_tunnel *tunnel = netdev_priv(dev); 1248 struct iphdr *iph = &tunnel->parms.iph; 1249 struct net *net = dev_net(dev); 1250 struct sit_net *sitn = net_generic(net, sit_net_id); 1251 1252 tunnel->dev = dev; 1253 strcpy(tunnel->parms.name, dev->name); 1254 1255 iph->version = 4; 1256 iph->protocol = IPPROTO_IPV6; 1257 iph->ihl = 5; 1258 iph->ttl = 64; 1259 1260 dev->tstats = alloc_percpu(struct pcpu_tstats); 1261 if (!dev->tstats) 1262 return -ENOMEM; 1263 dev_hold(dev); 1264 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1265 return 0; 1266 } 1267 1268 static void ipip6_netlink_parms(struct nlattr *data[], 1269 struct ip_tunnel_parm *parms) 1270 { 1271 memset(parms, 0, sizeof(*parms)); 1272 1273 parms->iph.version = 4; 1274 parms->iph.protocol = IPPROTO_IPV6; 1275 parms->iph.ihl = 5; 1276 parms->iph.ttl = 64; 1277 1278 if (!data) 1279 return; 1280 1281 if (data[IFLA_IPTUN_LINK]) 1282 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1283 1284 if (data[IFLA_IPTUN_LOCAL]) 1285 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1286 1287 if (data[IFLA_IPTUN_REMOTE]) 1288 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1289 1290 if (data[IFLA_IPTUN_TTL]) { 1291 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1292 if (parms->iph.ttl) 1293 parms->iph.frag_off = htons(IP_DF); 1294 } 1295 1296 if (data[IFLA_IPTUN_TOS]) 1297 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1298 1299 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1300 parms->iph.frag_off = htons(IP_DF); 1301 1302 if (data[IFLA_IPTUN_FLAGS]) 1303 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1304 } 1305 1306 #ifdef CONFIG_IPV6_SIT_6RD 1307 /* This function returns true when 6RD attributes are present in the nl msg */ 1308 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1309 struct ip_tunnel_6rd *ip6rd) 1310 { 1311 bool ret = false; 1312 memset(ip6rd, 0, sizeof(*ip6rd)); 1313 1314 if (!data) 1315 return ret; 1316 1317 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1318 ret = true; 1319 nla_memcpy(&ip6rd->prefix, data[IFLA_IPTUN_6RD_PREFIX], 1320 sizeof(struct in6_addr)); 1321 } 1322 1323 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1324 ret = true; 1325 ip6rd->relay_prefix = 1326 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1327 } 1328 1329 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1330 ret = true; 1331 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1332 } 1333 1334 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1335 ret = true; 1336 ip6rd->relay_prefixlen = 1337 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1338 } 1339 1340 return ret; 1341 } 1342 #endif 1343 1344 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1345 struct nlattr *tb[], struct nlattr *data[]) 1346 { 1347 struct net *net = dev_net(dev); 1348 struct ip_tunnel *nt; 1349 #ifdef CONFIG_IPV6_SIT_6RD 1350 struct ip_tunnel_6rd ip6rd; 1351 #endif 1352 int err; 1353 1354 nt = netdev_priv(dev); 1355 ipip6_netlink_parms(data, &nt->parms); 1356 1357 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1358 return -EEXIST; 1359 1360 err = ipip6_tunnel_create(dev); 1361 if (err < 0) 1362 return err; 1363 1364 #ifdef CONFIG_IPV6_SIT_6RD 1365 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1366 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1367 #endif 1368 1369 return err; 1370 } 1371 1372 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1373 struct nlattr *data[]) 1374 { 1375 struct ip_tunnel *t; 1376 struct ip_tunnel_parm p; 1377 struct net *net = dev_net(dev); 1378 struct sit_net *sitn = net_generic(net, sit_net_id); 1379 #ifdef CONFIG_IPV6_SIT_6RD 1380 struct ip_tunnel_6rd ip6rd; 1381 #endif 1382 1383 if (dev == sitn->fb_tunnel_dev) 1384 return -EINVAL; 1385 1386 ipip6_netlink_parms(data, &p); 1387 1388 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1389 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1390 return -EINVAL; 1391 1392 t = ipip6_tunnel_locate(net, &p, 0); 1393 1394 if (t) { 1395 if (t->dev != dev) 1396 return -EEXIST; 1397 } else 1398 t = netdev_priv(dev); 1399 1400 ipip6_tunnel_update(t, &p); 1401 1402 #ifdef CONFIG_IPV6_SIT_6RD 1403 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1404 return ipip6_tunnel_update_6rd(t, &ip6rd); 1405 #endif 1406 1407 return 0; 1408 } 1409 1410 static size_t ipip6_get_size(const struct net_device *dev) 1411 { 1412 return 1413 /* IFLA_IPTUN_LINK */ 1414 nla_total_size(4) + 1415 /* IFLA_IPTUN_LOCAL */ 1416 nla_total_size(4) + 1417 /* IFLA_IPTUN_REMOTE */ 1418 nla_total_size(4) + 1419 /* IFLA_IPTUN_TTL */ 1420 nla_total_size(1) + 1421 /* IFLA_IPTUN_TOS */ 1422 nla_total_size(1) + 1423 /* IFLA_IPTUN_PMTUDISC */ 1424 nla_total_size(1) + 1425 /* IFLA_IPTUN_FLAGS */ 1426 nla_total_size(2) + 1427 #ifdef CONFIG_IPV6_SIT_6RD 1428 /* IFLA_IPTUN_6RD_PREFIX */ 1429 nla_total_size(sizeof(struct in6_addr)) + 1430 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1431 nla_total_size(4) + 1432 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1433 nla_total_size(2) + 1434 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1435 nla_total_size(2) + 1436 #endif 1437 0; 1438 } 1439 1440 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1441 { 1442 struct ip_tunnel *tunnel = netdev_priv(dev); 1443 struct ip_tunnel_parm *parm = &tunnel->parms; 1444 1445 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1446 nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1447 nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1448 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1449 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1450 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1451 !!(parm->iph.frag_off & htons(IP_DF))) || 1452 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags)) 1453 goto nla_put_failure; 1454 1455 #ifdef CONFIG_IPV6_SIT_6RD 1456 if (nla_put(skb, IFLA_IPTUN_6RD_PREFIX, sizeof(struct in6_addr), 1457 &tunnel->ip6rd.prefix) || 1458 nla_put_be32(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1459 tunnel->ip6rd.relay_prefix) || 1460 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1461 tunnel->ip6rd.prefixlen) || 1462 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1463 tunnel->ip6rd.relay_prefixlen)) 1464 goto nla_put_failure; 1465 #endif 1466 1467 return 0; 1468 1469 nla_put_failure: 1470 return -EMSGSIZE; 1471 } 1472 1473 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1474 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1475 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1476 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1477 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1478 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1479 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1480 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1481 #ifdef CONFIG_IPV6_SIT_6RD 1482 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1483 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1484 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1485 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1486 #endif 1487 }; 1488 1489 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1490 .kind = "sit", 1491 .maxtype = IFLA_IPTUN_MAX, 1492 .policy = ipip6_policy, 1493 .priv_size = sizeof(struct ip_tunnel), 1494 .setup = ipip6_tunnel_setup, 1495 .newlink = ipip6_newlink, 1496 .changelink = ipip6_changelink, 1497 .get_size = ipip6_get_size, 1498 .fill_info = ipip6_fill_info, 1499 }; 1500 1501 static struct xfrm_tunnel sit_handler __read_mostly = { 1502 .handler = ipip6_rcv, 1503 .err_handler = ipip6_err, 1504 .priority = 1, 1505 }; 1506 1507 static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head) 1508 { 1509 int prio; 1510 1511 for (prio = 1; prio < 4; prio++) { 1512 int h; 1513 for (h = 0; h < HASH_SIZE; h++) { 1514 struct ip_tunnel *t; 1515 1516 t = rtnl_dereference(sitn->tunnels[prio][h]); 1517 while (t != NULL) { 1518 unregister_netdevice_queue(t->dev, head); 1519 t = rtnl_dereference(t->next); 1520 } 1521 } 1522 } 1523 } 1524 1525 static int __net_init sit_init_net(struct net *net) 1526 { 1527 struct sit_net *sitn = net_generic(net, sit_net_id); 1528 struct ip_tunnel *t; 1529 int err; 1530 1531 sitn->tunnels[0] = sitn->tunnels_wc; 1532 sitn->tunnels[1] = sitn->tunnels_l; 1533 sitn->tunnels[2] = sitn->tunnels_r; 1534 sitn->tunnels[3] = sitn->tunnels_r_l; 1535 1536 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1537 ipip6_tunnel_setup); 1538 if (!sitn->fb_tunnel_dev) { 1539 err = -ENOMEM; 1540 goto err_alloc_dev; 1541 } 1542 dev_net_set(sitn->fb_tunnel_dev, net); 1543 1544 err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1545 if (err) 1546 goto err_dev_free; 1547 1548 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1549 1550 if ((err = register_netdev(sitn->fb_tunnel_dev))) 1551 goto err_reg_dev; 1552 1553 t = netdev_priv(sitn->fb_tunnel_dev); 1554 1555 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1556 return 0; 1557 1558 err_reg_dev: 1559 dev_put(sitn->fb_tunnel_dev); 1560 err_dev_free: 1561 ipip6_dev_free(sitn->fb_tunnel_dev); 1562 err_alloc_dev: 1563 return err; 1564 } 1565 1566 static void __net_exit sit_exit_net(struct net *net) 1567 { 1568 struct sit_net *sitn = net_generic(net, sit_net_id); 1569 LIST_HEAD(list); 1570 1571 rtnl_lock(); 1572 sit_destroy_tunnels(sitn, &list); 1573 unregister_netdevice_queue(sitn->fb_tunnel_dev, &list); 1574 unregister_netdevice_many(&list); 1575 rtnl_unlock(); 1576 } 1577 1578 static struct pernet_operations sit_net_ops = { 1579 .init = sit_init_net, 1580 .exit = sit_exit_net, 1581 .id = &sit_net_id, 1582 .size = sizeof(struct sit_net), 1583 }; 1584 1585 static void __exit sit_cleanup(void) 1586 { 1587 rtnl_link_unregister(&sit_link_ops); 1588 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1589 1590 unregister_pernet_device(&sit_net_ops); 1591 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1592 } 1593 1594 static int __init sit_init(void) 1595 { 1596 int err; 1597 1598 pr_info("IPv6 over IPv4 tunneling driver\n"); 1599 1600 err = register_pernet_device(&sit_net_ops); 1601 if (err < 0) 1602 return err; 1603 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1604 if (err < 0) { 1605 pr_info("%s: can't add protocol\n", __func__); 1606 goto xfrm_tunnel_failed; 1607 } 1608 err = rtnl_link_register(&sit_link_ops); 1609 if (err < 0) 1610 goto rtnl_link_failed; 1611 1612 out: 1613 return err; 1614 1615 rtnl_link_failed: 1616 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1617 xfrm_tunnel_failed: 1618 unregister_pernet_device(&sit_net_ops); 1619 goto out; 1620 } 1621 1622 module_init(sit_init); 1623 module_exit(sit_cleanup); 1624 MODULE_LICENSE("GPL"); 1625 MODULE_ALIAS_NETDEV("sit0"); 1626