1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com> */ 3 4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 5 6 #include <linux/module.h> 7 #include <linux/skbuff.h> 8 #include <linux/udp.h> 9 #include <linux/jhash.h> 10 #include <linux/if_tunnel.h> 11 #include <linux/net.h> 12 #include <linux/igmp.h> 13 #include <linux/workqueue.h> 14 #include <net/sch_generic.h> 15 #include <net/net_namespace.h> 16 #include <net/ip.h> 17 #include <net/udp.h> 18 #include <net/udp_tunnel.h> 19 #include <net/icmp.h> 20 #include <net/mld.h> 21 #include <net/amt.h> 22 #include <uapi/linux/amt.h> 23 #include <linux/security.h> 24 #include <net/gro_cells.h> 25 #include <net/ipv6.h> 26 #include <net/if_inet6.h> 27 #include <net/ndisc.h> 28 #include <net/addrconf.h> 29 #include <net/ip6_route.h> 30 #include <net/inet_common.h> 31 #include <net/ip6_checksum.h> 32 33 static struct workqueue_struct *amt_wq; 34 35 static HLIST_HEAD(source_gc_list); 36 /* Lock for source_gc_list */ 37 static spinlock_t source_gc_lock; 38 static struct delayed_work source_gc_wq; 39 static char *status_str[] = { 40 "AMT_STATUS_INIT", 41 "AMT_STATUS_SENT_DISCOVERY", 42 "AMT_STATUS_RECEIVED_DISCOVERY", 43 "AMT_STATUS_SENT_ADVERTISEMENT", 44 "AMT_STATUS_RECEIVED_ADVERTISEMENT", 45 "AMT_STATUS_SENT_REQUEST", 46 "AMT_STATUS_RECEIVED_REQUEST", 47 "AMT_STATUS_SENT_QUERY", 48 "AMT_STATUS_RECEIVED_QUERY", 49 "AMT_STATUS_SENT_UPDATE", 50 "AMT_STATUS_RECEIVED_UPDATE", 51 }; 52 53 static char *type_str[] = { 54 "", /* Type 0 is not defined */ 55 "AMT_MSG_DISCOVERY", 56 "AMT_MSG_ADVERTISEMENT", 57 "AMT_MSG_REQUEST", 58 "AMT_MSG_MEMBERSHIP_QUERY", 59 "AMT_MSG_MEMBERSHIP_UPDATE", 60 "AMT_MSG_MULTICAST_DATA", 61 "AMT_MSG_TEARDOWN", 62 }; 63 64 static char *action_str[] = { 65 "AMT_ACT_GMI", 66 "AMT_ACT_GMI_ZERO", 67 "AMT_ACT_GT", 68 "AMT_ACT_STATUS_FWD_NEW", 69 "AMT_ACT_STATUS_D_FWD_NEW", 70 "AMT_ACT_STATUS_NONE_NEW", 71 }; 72 73 static struct igmpv3_grec igmpv3_zero_grec; 74 75 #if IS_ENABLED(CONFIG_IPV6) 76 #define MLD2_ALL_NODE_INIT { { { 0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01 } } } 77 static struct in6_addr mld2_all_node = MLD2_ALL_NODE_INIT; 78 static struct mld2_grec mldv2_zero_grec; 79 #endif 80 81 static struct amt_skb_cb *amt_skb_cb(struct sk_buff *skb) 82 { 83 BUILD_BUG_ON(sizeof(struct amt_skb_cb) + sizeof(struct qdisc_skb_cb) > 84 sizeof_field(struct sk_buff, cb)); 85 86 return (struct amt_skb_cb *)((void *)skb->cb + 87 sizeof(struct qdisc_skb_cb)); 88 } 89 90 static void __amt_source_gc_work(void) 91 { 92 struct amt_source_node *snode; 93 struct hlist_head gc_list; 94 struct hlist_node *t; 95 96 spin_lock_bh(&source_gc_lock); 97 hlist_move_list(&source_gc_list, &gc_list); 98 spin_unlock_bh(&source_gc_lock); 99 100 hlist_for_each_entry_safe(snode, t, &gc_list, node) { 101 hlist_del_rcu(&snode->node); 102 kfree_rcu(snode, rcu); 103 } 104 } 105 106 static void amt_source_gc_work(struct work_struct *work) 107 { 108 __amt_source_gc_work(); 109 110 spin_lock_bh(&source_gc_lock); 111 mod_delayed_work(amt_wq, &source_gc_wq, 112 msecs_to_jiffies(AMT_GC_INTERVAL)); 113 spin_unlock_bh(&source_gc_lock); 114 } 115 116 static bool amt_addr_equal(union amt_addr *a, union amt_addr *b) 117 { 118 return !memcmp(a, b, sizeof(union amt_addr)); 119 } 120 121 static u32 amt_source_hash(struct amt_tunnel_list *tunnel, union amt_addr *src) 122 { 123 u32 hash = jhash(src, sizeof(*src), tunnel->amt->hash_seed); 124 125 return reciprocal_scale(hash, tunnel->amt->hash_buckets); 126 } 127 128 static bool amt_status_filter(struct amt_source_node *snode, 129 enum amt_filter filter) 130 { 131 bool rc = false; 132 133 switch (filter) { 134 case AMT_FILTER_FWD: 135 if (snode->status == AMT_SOURCE_STATUS_FWD && 136 snode->flags == AMT_SOURCE_OLD) 137 rc = true; 138 break; 139 case AMT_FILTER_D_FWD: 140 if (snode->status == AMT_SOURCE_STATUS_D_FWD && 141 snode->flags == AMT_SOURCE_OLD) 142 rc = true; 143 break; 144 case AMT_FILTER_FWD_NEW: 145 if (snode->status == AMT_SOURCE_STATUS_FWD && 146 snode->flags == AMT_SOURCE_NEW) 147 rc = true; 148 break; 149 case AMT_FILTER_D_FWD_NEW: 150 if (snode->status == AMT_SOURCE_STATUS_D_FWD && 151 snode->flags == AMT_SOURCE_NEW) 152 rc = true; 153 break; 154 case AMT_FILTER_ALL: 155 rc = true; 156 break; 157 case AMT_FILTER_NONE_NEW: 158 if (snode->status == AMT_SOURCE_STATUS_NONE && 159 snode->flags == AMT_SOURCE_NEW) 160 rc = true; 161 break; 162 case AMT_FILTER_BOTH: 163 if ((snode->status == AMT_SOURCE_STATUS_D_FWD || 164 snode->status == AMT_SOURCE_STATUS_FWD) && 165 snode->flags == AMT_SOURCE_OLD) 166 rc = true; 167 break; 168 case AMT_FILTER_BOTH_NEW: 169 if ((snode->status == AMT_SOURCE_STATUS_D_FWD || 170 snode->status == AMT_SOURCE_STATUS_FWD) && 171 snode->flags == AMT_SOURCE_NEW) 172 rc = true; 173 break; 174 default: 175 WARN_ON_ONCE(1); 176 break; 177 } 178 179 return rc; 180 } 181 182 static struct amt_source_node *amt_lookup_src(struct amt_tunnel_list *tunnel, 183 struct amt_group_node *gnode, 184 enum amt_filter filter, 185 union amt_addr *src) 186 { 187 u32 hash = amt_source_hash(tunnel, src); 188 struct amt_source_node *snode; 189 190 hlist_for_each_entry_rcu(snode, &gnode->sources[hash], node) 191 if (amt_status_filter(snode, filter) && 192 amt_addr_equal(&snode->source_addr, src)) 193 return snode; 194 195 return NULL; 196 } 197 198 static u32 amt_group_hash(struct amt_tunnel_list *tunnel, union amt_addr *group) 199 { 200 u32 hash = jhash(group, sizeof(*group), tunnel->amt->hash_seed); 201 202 return reciprocal_scale(hash, tunnel->amt->hash_buckets); 203 } 204 205 static struct amt_group_node *amt_lookup_group(struct amt_tunnel_list *tunnel, 206 union amt_addr *group, 207 union amt_addr *host, 208 bool v6) 209 { 210 u32 hash = amt_group_hash(tunnel, group); 211 struct amt_group_node *gnode; 212 213 hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash], node) { 214 if (amt_addr_equal(&gnode->group_addr, group) && 215 amt_addr_equal(&gnode->host_addr, host) && 216 gnode->v6 == v6) 217 return gnode; 218 } 219 220 return NULL; 221 } 222 223 static void amt_destroy_source(struct amt_source_node *snode) 224 { 225 struct amt_group_node *gnode = snode->gnode; 226 struct amt_tunnel_list *tunnel; 227 228 tunnel = gnode->tunnel_list; 229 230 if (!gnode->v6) { 231 netdev_dbg(snode->gnode->amt->dev, 232 "Delete source %pI4 from %pI4\n", 233 &snode->source_addr.ip4, 234 &gnode->group_addr.ip4); 235 #if IS_ENABLED(CONFIG_IPV6) 236 } else { 237 netdev_dbg(snode->gnode->amt->dev, 238 "Delete source %pI6 from %pI6\n", 239 &snode->source_addr.ip6, 240 &gnode->group_addr.ip6); 241 #endif 242 } 243 244 cancel_delayed_work(&snode->source_timer); 245 hlist_del_init_rcu(&snode->node); 246 tunnel->nr_sources--; 247 gnode->nr_sources--; 248 spin_lock_bh(&source_gc_lock); 249 hlist_add_head_rcu(&snode->node, &source_gc_list); 250 spin_unlock_bh(&source_gc_lock); 251 } 252 253 static void amt_del_group(struct amt_dev *amt, struct amt_group_node *gnode) 254 { 255 struct amt_source_node *snode; 256 struct hlist_node *t; 257 int i; 258 259 if (cancel_delayed_work(&gnode->group_timer)) 260 dev_put(amt->dev); 261 hlist_del_rcu(&gnode->node); 262 gnode->tunnel_list->nr_groups--; 263 264 if (!gnode->v6) 265 netdev_dbg(amt->dev, "Leave group %pI4\n", 266 &gnode->group_addr.ip4); 267 #if IS_ENABLED(CONFIG_IPV6) 268 else 269 netdev_dbg(amt->dev, "Leave group %pI6\n", 270 &gnode->group_addr.ip6); 271 #endif 272 for (i = 0; i < amt->hash_buckets; i++) 273 hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) 274 amt_destroy_source(snode); 275 276 /* tunnel->lock was acquired outside of amt_del_group() 277 * But rcu_read_lock() was acquired too so It's safe. 278 */ 279 kfree_rcu(gnode, rcu); 280 } 281 282 /* If a source timer expires with a router filter-mode for the group of 283 * INCLUDE, the router concludes that traffic from this particular 284 * source is no longer desired on the attached network, and deletes the 285 * associated source record. 286 */ 287 static void amt_source_work(struct work_struct *work) 288 { 289 struct amt_source_node *snode = container_of(to_delayed_work(work), 290 struct amt_source_node, 291 source_timer); 292 struct amt_group_node *gnode = snode->gnode; 293 struct amt_dev *amt = gnode->amt; 294 struct amt_tunnel_list *tunnel; 295 296 tunnel = gnode->tunnel_list; 297 spin_lock_bh(&tunnel->lock); 298 rcu_read_lock(); 299 if (gnode->filter_mode == MCAST_INCLUDE) { 300 amt_destroy_source(snode); 301 if (!gnode->nr_sources) 302 amt_del_group(amt, gnode); 303 } else { 304 /* When a router filter-mode for a group is EXCLUDE, 305 * source records are only deleted when the group timer expires 306 */ 307 snode->status = AMT_SOURCE_STATUS_D_FWD; 308 } 309 rcu_read_unlock(); 310 spin_unlock_bh(&tunnel->lock); 311 } 312 313 static void amt_act_src(struct amt_tunnel_list *tunnel, 314 struct amt_group_node *gnode, 315 struct amt_source_node *snode, 316 enum amt_act act) 317 { 318 struct amt_dev *amt = tunnel->amt; 319 320 switch (act) { 321 case AMT_ACT_GMI: 322 mod_delayed_work(amt_wq, &snode->source_timer, 323 msecs_to_jiffies(amt_gmi(amt))); 324 break; 325 case AMT_ACT_GMI_ZERO: 326 cancel_delayed_work(&snode->source_timer); 327 break; 328 case AMT_ACT_GT: 329 mod_delayed_work(amt_wq, &snode->source_timer, 330 gnode->group_timer.timer.expires); 331 break; 332 case AMT_ACT_STATUS_FWD_NEW: 333 snode->status = AMT_SOURCE_STATUS_FWD; 334 snode->flags = AMT_SOURCE_NEW; 335 break; 336 case AMT_ACT_STATUS_D_FWD_NEW: 337 snode->status = AMT_SOURCE_STATUS_D_FWD; 338 snode->flags = AMT_SOURCE_NEW; 339 break; 340 case AMT_ACT_STATUS_NONE_NEW: 341 cancel_delayed_work(&snode->source_timer); 342 snode->status = AMT_SOURCE_STATUS_NONE; 343 snode->flags = AMT_SOURCE_NEW; 344 break; 345 default: 346 WARN_ON_ONCE(1); 347 return; 348 } 349 350 if (!gnode->v6) 351 netdev_dbg(amt->dev, "Source %pI4 from %pI4 Acted %s\n", 352 &snode->source_addr.ip4, 353 &gnode->group_addr.ip4, 354 action_str[act]); 355 #if IS_ENABLED(CONFIG_IPV6) 356 else 357 netdev_dbg(amt->dev, "Source %pI6 from %pI6 Acted %s\n", 358 &snode->source_addr.ip6, 359 &gnode->group_addr.ip6, 360 action_str[act]); 361 #endif 362 } 363 364 static struct amt_source_node *amt_alloc_snode(struct amt_group_node *gnode, 365 union amt_addr *src) 366 { 367 struct amt_source_node *snode; 368 369 snode = kzalloc(sizeof(*snode), GFP_ATOMIC); 370 if (!snode) 371 return NULL; 372 373 memcpy(&snode->source_addr, src, sizeof(union amt_addr)); 374 snode->gnode = gnode; 375 snode->status = AMT_SOURCE_STATUS_NONE; 376 snode->flags = AMT_SOURCE_NEW; 377 INIT_HLIST_NODE(&snode->node); 378 INIT_DELAYED_WORK(&snode->source_timer, amt_source_work); 379 380 return snode; 381 } 382 383 /* RFC 3810 - 7.2.2. Definition of Filter Timers 384 * 385 * Router Mode Filter Timer Actions/Comments 386 * ----------- ----------------- ---------------- 387 * 388 * INCLUDE Not Used All listeners in 389 * INCLUDE mode. 390 * 391 * EXCLUDE Timer > 0 At least one listener 392 * in EXCLUDE mode. 393 * 394 * EXCLUDE Timer == 0 No more listeners in 395 * EXCLUDE mode for the 396 * multicast address. 397 * If the Requested List 398 * is empty, delete 399 * Multicast Address 400 * Record. If not, switch 401 * to INCLUDE filter mode; 402 * the sources in the 403 * Requested List are 404 * moved to the Include 405 * List, and the Exclude 406 * List is deleted. 407 */ 408 static void amt_group_work(struct work_struct *work) 409 { 410 struct amt_group_node *gnode = container_of(to_delayed_work(work), 411 struct amt_group_node, 412 group_timer); 413 struct amt_tunnel_list *tunnel = gnode->tunnel_list; 414 struct amt_dev *amt = gnode->amt; 415 struct amt_source_node *snode; 416 bool delete_group = true; 417 struct hlist_node *t; 418 int i, buckets; 419 420 buckets = amt->hash_buckets; 421 422 spin_lock_bh(&tunnel->lock); 423 if (gnode->filter_mode == MCAST_INCLUDE) { 424 /* Not Used */ 425 spin_unlock_bh(&tunnel->lock); 426 goto out; 427 } 428 429 rcu_read_lock(); 430 for (i = 0; i < buckets; i++) { 431 hlist_for_each_entry_safe(snode, t, 432 &gnode->sources[i], node) { 433 if (!delayed_work_pending(&snode->source_timer) || 434 snode->status == AMT_SOURCE_STATUS_D_FWD) { 435 amt_destroy_source(snode); 436 } else { 437 delete_group = false; 438 snode->status = AMT_SOURCE_STATUS_FWD; 439 } 440 } 441 } 442 if (delete_group) 443 amt_del_group(amt, gnode); 444 else 445 gnode->filter_mode = MCAST_INCLUDE; 446 rcu_read_unlock(); 447 spin_unlock_bh(&tunnel->lock); 448 out: 449 dev_put(amt->dev); 450 } 451 452 /* Non-existent group is created as INCLUDE {empty}: 453 * 454 * RFC 3376 - 5.1. Action on Change of Interface State 455 * 456 * If no interface state existed for that multicast address before 457 * the change (i.e., the change consisted of creating a new 458 * per-interface record), or if no state exists after the change 459 * (i.e., the change consisted of deleting a per-interface record), 460 * then the "non-existent" state is considered to have a filter mode 461 * of INCLUDE and an empty source list. 462 */ 463 static struct amt_group_node *amt_add_group(struct amt_dev *amt, 464 struct amt_tunnel_list *tunnel, 465 union amt_addr *group, 466 union amt_addr *host, 467 bool v6) 468 { 469 struct amt_group_node *gnode; 470 u32 hash; 471 int i; 472 473 if (tunnel->nr_groups >= amt->max_groups) 474 return ERR_PTR(-ENOSPC); 475 476 gnode = kzalloc(sizeof(*gnode) + 477 (sizeof(struct hlist_head) * amt->hash_buckets), 478 GFP_ATOMIC); 479 if (unlikely(!gnode)) 480 return ERR_PTR(-ENOMEM); 481 482 gnode->amt = amt; 483 gnode->group_addr = *group; 484 gnode->host_addr = *host; 485 gnode->v6 = v6; 486 gnode->tunnel_list = tunnel; 487 gnode->filter_mode = MCAST_INCLUDE; 488 INIT_HLIST_NODE(&gnode->node); 489 INIT_DELAYED_WORK(&gnode->group_timer, amt_group_work); 490 for (i = 0; i < amt->hash_buckets; i++) 491 INIT_HLIST_HEAD(&gnode->sources[i]); 492 493 hash = amt_group_hash(tunnel, group); 494 hlist_add_head_rcu(&gnode->node, &tunnel->groups[hash]); 495 tunnel->nr_groups++; 496 497 if (!gnode->v6) 498 netdev_dbg(amt->dev, "Join group %pI4\n", 499 &gnode->group_addr.ip4); 500 #if IS_ENABLED(CONFIG_IPV6) 501 else 502 netdev_dbg(amt->dev, "Join group %pI6\n", 503 &gnode->group_addr.ip6); 504 #endif 505 506 return gnode; 507 } 508 509 static struct sk_buff *amt_build_igmp_gq(struct amt_dev *amt) 510 { 511 u8 ra[AMT_IPHDR_OPTS] = { IPOPT_RA, 4, 0, 0 }; 512 int hlen = LL_RESERVED_SPACE(amt->dev); 513 int tlen = amt->dev->needed_tailroom; 514 struct igmpv3_query *ihv3; 515 void *csum_start = NULL; 516 __sum16 *csum = NULL; 517 struct sk_buff *skb; 518 struct ethhdr *eth; 519 struct iphdr *iph; 520 unsigned int len; 521 int offset; 522 523 len = hlen + tlen + sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3); 524 skb = netdev_alloc_skb_ip_align(amt->dev, len); 525 if (!skb) 526 return NULL; 527 528 skb_reserve(skb, hlen); 529 skb_push(skb, sizeof(*eth)); 530 skb->protocol = htons(ETH_P_IP); 531 skb_reset_mac_header(skb); 532 skb->priority = TC_PRIO_CONTROL; 533 skb_put(skb, sizeof(*iph)); 534 skb_put_data(skb, ra, sizeof(ra)); 535 skb_put(skb, sizeof(*ihv3)); 536 skb_pull(skb, sizeof(*eth)); 537 skb_reset_network_header(skb); 538 539 iph = ip_hdr(skb); 540 iph->version = 4; 541 iph->ihl = (sizeof(struct iphdr) + AMT_IPHDR_OPTS) >> 2; 542 iph->tos = AMT_TOS; 543 iph->tot_len = htons(sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3)); 544 iph->frag_off = htons(IP_DF); 545 iph->ttl = 1; 546 iph->id = 0; 547 iph->protocol = IPPROTO_IGMP; 548 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); 549 iph->saddr = htonl(INADDR_ANY); 550 ip_send_check(iph); 551 552 eth = eth_hdr(skb); 553 ether_addr_copy(eth->h_source, amt->dev->dev_addr); 554 ip_eth_mc_map(htonl(INADDR_ALLHOSTS_GROUP), eth->h_dest); 555 eth->h_proto = htons(ETH_P_IP); 556 557 ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS); 558 skb_reset_transport_header(skb); 559 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; 560 ihv3->code = 1; 561 ihv3->group = 0; 562 ihv3->qqic = amt->qi; 563 ihv3->nsrcs = 0; 564 ihv3->resv = 0; 565 ihv3->suppress = false; 566 ihv3->qrv = READ_ONCE(amt->net->ipv4.sysctl_igmp_qrv); 567 ihv3->csum = 0; 568 csum = &ihv3->csum; 569 csum_start = (void *)ihv3; 570 *csum = ip_compute_csum(csum_start, sizeof(*ihv3)); 571 offset = skb_transport_offset(skb); 572 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 573 skb->ip_summed = CHECKSUM_NONE; 574 575 skb_push(skb, sizeof(*eth) + sizeof(*iph) + AMT_IPHDR_OPTS); 576 577 return skb; 578 } 579 580 static void amt_update_gw_status(struct amt_dev *amt, enum amt_status status, 581 bool validate) 582 { 583 if (validate && amt->status >= status) 584 return; 585 netdev_dbg(amt->dev, "Update GW status %s -> %s", 586 status_str[amt->status], status_str[status]); 587 WRITE_ONCE(amt->status, status); 588 } 589 590 static void __amt_update_relay_status(struct amt_tunnel_list *tunnel, 591 enum amt_status status, 592 bool validate) 593 { 594 if (validate && tunnel->status >= status) 595 return; 596 netdev_dbg(tunnel->amt->dev, 597 "Update Tunnel(IP = %pI4, PORT = %u) status %s -> %s", 598 &tunnel->ip4, ntohs(tunnel->source_port), 599 status_str[tunnel->status], status_str[status]); 600 tunnel->status = status; 601 } 602 603 static void amt_update_relay_status(struct amt_tunnel_list *tunnel, 604 enum amt_status status, bool validate) 605 { 606 spin_lock_bh(&tunnel->lock); 607 __amt_update_relay_status(tunnel, status, validate); 608 spin_unlock_bh(&tunnel->lock); 609 } 610 611 static void amt_send_discovery(struct amt_dev *amt) 612 { 613 struct amt_header_discovery *amtd; 614 int hlen, tlen, offset; 615 struct socket *sock; 616 struct udphdr *udph; 617 struct sk_buff *skb; 618 struct iphdr *iph; 619 struct rtable *rt; 620 struct flowi4 fl4; 621 u32 len; 622 int err; 623 624 rcu_read_lock(); 625 sock = rcu_dereference(amt->sock); 626 if (!sock) 627 goto out; 628 629 if (!netif_running(amt->stream_dev) || !netif_running(amt->dev)) 630 goto out; 631 632 rt = ip_route_output_ports(amt->net, &fl4, sock->sk, 633 amt->discovery_ip, amt->local_ip, 634 amt->gw_port, amt->relay_port, 635 IPPROTO_UDP, 0, 636 amt->stream_dev->ifindex); 637 if (IS_ERR(rt)) { 638 amt->dev->stats.tx_errors++; 639 goto out; 640 } 641 642 hlen = LL_RESERVED_SPACE(amt->dev); 643 tlen = amt->dev->needed_tailroom; 644 len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amtd); 645 skb = netdev_alloc_skb_ip_align(amt->dev, len); 646 if (!skb) { 647 ip_rt_put(rt); 648 amt->dev->stats.tx_errors++; 649 goto out; 650 } 651 652 skb->priority = TC_PRIO_CONTROL; 653 skb_dst_set(skb, &rt->dst); 654 655 len = sizeof(*iph) + sizeof(*udph) + sizeof(*amtd); 656 skb_reset_network_header(skb); 657 skb_put(skb, len); 658 amtd = skb_pull(skb, sizeof(*iph) + sizeof(*udph)); 659 amtd->version = 0; 660 amtd->type = AMT_MSG_DISCOVERY; 661 amtd->reserved = 0; 662 amtd->nonce = amt->nonce; 663 skb_push(skb, sizeof(*udph)); 664 skb_reset_transport_header(skb); 665 udph = udp_hdr(skb); 666 udph->source = amt->gw_port; 667 udph->dest = amt->relay_port; 668 udph->len = htons(sizeof(*udph) + sizeof(*amtd)); 669 udph->check = 0; 670 offset = skb_transport_offset(skb); 671 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 672 udph->check = csum_tcpudp_magic(amt->local_ip, amt->discovery_ip, 673 sizeof(*udph) + sizeof(*amtd), 674 IPPROTO_UDP, skb->csum); 675 676 skb_push(skb, sizeof(*iph)); 677 iph = ip_hdr(skb); 678 iph->version = 4; 679 iph->ihl = (sizeof(struct iphdr)) >> 2; 680 iph->tos = AMT_TOS; 681 iph->frag_off = 0; 682 iph->ttl = ip4_dst_hoplimit(&rt->dst); 683 iph->daddr = amt->discovery_ip; 684 iph->saddr = amt->local_ip; 685 iph->protocol = IPPROTO_UDP; 686 iph->tot_len = htons(len); 687 688 skb->ip_summed = CHECKSUM_NONE; 689 ip_select_ident(amt->net, skb, NULL); 690 ip_send_check(iph); 691 err = ip_local_out(amt->net, sock->sk, skb); 692 if (unlikely(net_xmit_eval(err))) 693 amt->dev->stats.tx_errors++; 694 695 amt_update_gw_status(amt, AMT_STATUS_SENT_DISCOVERY, true); 696 out: 697 rcu_read_unlock(); 698 } 699 700 static void amt_send_request(struct amt_dev *amt, bool v6) 701 { 702 struct amt_header_request *amtrh; 703 int hlen, tlen, offset; 704 struct socket *sock; 705 struct udphdr *udph; 706 struct sk_buff *skb; 707 struct iphdr *iph; 708 struct rtable *rt; 709 struct flowi4 fl4; 710 u32 len; 711 int err; 712 713 rcu_read_lock(); 714 sock = rcu_dereference(amt->sock); 715 if (!sock) 716 goto out; 717 718 if (!netif_running(amt->stream_dev) || !netif_running(amt->dev)) 719 goto out; 720 721 rt = ip_route_output_ports(amt->net, &fl4, sock->sk, 722 amt->remote_ip, amt->local_ip, 723 amt->gw_port, amt->relay_port, 724 IPPROTO_UDP, 0, 725 amt->stream_dev->ifindex); 726 if (IS_ERR(rt)) { 727 amt->dev->stats.tx_errors++; 728 goto out; 729 } 730 731 hlen = LL_RESERVED_SPACE(amt->dev); 732 tlen = amt->dev->needed_tailroom; 733 len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amtrh); 734 skb = netdev_alloc_skb_ip_align(amt->dev, len); 735 if (!skb) { 736 ip_rt_put(rt); 737 amt->dev->stats.tx_errors++; 738 goto out; 739 } 740 741 skb->priority = TC_PRIO_CONTROL; 742 skb_dst_set(skb, &rt->dst); 743 744 len = sizeof(*iph) + sizeof(*udph) + sizeof(*amtrh); 745 skb_reset_network_header(skb); 746 skb_put(skb, len); 747 amtrh = skb_pull(skb, sizeof(*iph) + sizeof(*udph)); 748 amtrh->version = 0; 749 amtrh->type = AMT_MSG_REQUEST; 750 amtrh->reserved1 = 0; 751 amtrh->p = v6; 752 amtrh->reserved2 = 0; 753 amtrh->nonce = amt->nonce; 754 skb_push(skb, sizeof(*udph)); 755 skb_reset_transport_header(skb); 756 udph = udp_hdr(skb); 757 udph->source = amt->gw_port; 758 udph->dest = amt->relay_port; 759 udph->len = htons(sizeof(*amtrh) + sizeof(*udph)); 760 udph->check = 0; 761 offset = skb_transport_offset(skb); 762 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 763 udph->check = csum_tcpudp_magic(amt->local_ip, amt->remote_ip, 764 sizeof(*udph) + sizeof(*amtrh), 765 IPPROTO_UDP, skb->csum); 766 767 skb_push(skb, sizeof(*iph)); 768 iph = ip_hdr(skb); 769 iph->version = 4; 770 iph->ihl = (sizeof(struct iphdr)) >> 2; 771 iph->tos = AMT_TOS; 772 iph->frag_off = 0; 773 iph->ttl = ip4_dst_hoplimit(&rt->dst); 774 iph->daddr = amt->remote_ip; 775 iph->saddr = amt->local_ip; 776 iph->protocol = IPPROTO_UDP; 777 iph->tot_len = htons(len); 778 779 skb->ip_summed = CHECKSUM_NONE; 780 ip_select_ident(amt->net, skb, NULL); 781 ip_send_check(iph); 782 err = ip_local_out(amt->net, sock->sk, skb); 783 if (unlikely(net_xmit_eval(err))) 784 amt->dev->stats.tx_errors++; 785 786 out: 787 rcu_read_unlock(); 788 } 789 790 static void amt_send_igmp_gq(struct amt_dev *amt, 791 struct amt_tunnel_list *tunnel) 792 { 793 struct sk_buff *skb; 794 795 skb = amt_build_igmp_gq(amt); 796 if (!skb) 797 return; 798 799 amt_skb_cb(skb)->tunnel = tunnel; 800 dev_queue_xmit(skb); 801 } 802 803 #if IS_ENABLED(CONFIG_IPV6) 804 static struct sk_buff *amt_build_mld_gq(struct amt_dev *amt) 805 { 806 u8 ra[AMT_IP6HDR_OPTS] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, 807 2, 0, 0, IPV6_TLV_PAD1, IPV6_TLV_PAD1 }; 808 int hlen = LL_RESERVED_SPACE(amt->dev); 809 int tlen = amt->dev->needed_tailroom; 810 struct mld2_query *mld2q; 811 void *csum_start = NULL; 812 struct ipv6hdr *ip6h; 813 struct sk_buff *skb; 814 struct ethhdr *eth; 815 u32 len; 816 817 len = hlen + tlen + sizeof(*ip6h) + sizeof(ra) + sizeof(*mld2q); 818 skb = netdev_alloc_skb_ip_align(amt->dev, len); 819 if (!skb) 820 return NULL; 821 822 skb_reserve(skb, hlen); 823 skb_push(skb, sizeof(*eth)); 824 skb_reset_mac_header(skb); 825 eth = eth_hdr(skb); 826 skb->priority = TC_PRIO_CONTROL; 827 skb->protocol = htons(ETH_P_IPV6); 828 skb_put_zero(skb, sizeof(*ip6h)); 829 skb_put_data(skb, ra, sizeof(ra)); 830 skb_put_zero(skb, sizeof(*mld2q)); 831 skb_pull(skb, sizeof(*eth)); 832 skb_reset_network_header(skb); 833 ip6h = ipv6_hdr(skb); 834 ip6h->payload_len = htons(sizeof(ra) + sizeof(*mld2q)); 835 ip6h->nexthdr = NEXTHDR_HOP; 836 ip6h->hop_limit = 1; 837 ip6h->daddr = mld2_all_node; 838 ip6_flow_hdr(ip6h, 0, 0); 839 840 if (ipv6_dev_get_saddr(amt->net, amt->dev, &ip6h->daddr, 0, 841 &ip6h->saddr)) { 842 amt->dev->stats.tx_errors++; 843 kfree_skb(skb); 844 return NULL; 845 } 846 847 eth->h_proto = htons(ETH_P_IPV6); 848 ether_addr_copy(eth->h_source, amt->dev->dev_addr); 849 ipv6_eth_mc_map(&mld2_all_node, eth->h_dest); 850 851 skb_pull(skb, sizeof(*ip6h) + sizeof(ra)); 852 skb_reset_transport_header(skb); 853 mld2q = (struct mld2_query *)icmp6_hdr(skb); 854 mld2q->mld2q_mrc = htons(1); 855 mld2q->mld2q_type = ICMPV6_MGM_QUERY; 856 mld2q->mld2q_code = 0; 857 mld2q->mld2q_cksum = 0; 858 mld2q->mld2q_resv1 = 0; 859 mld2q->mld2q_resv2 = 0; 860 mld2q->mld2q_suppress = 0; 861 mld2q->mld2q_qrv = amt->qrv; 862 mld2q->mld2q_nsrcs = 0; 863 mld2q->mld2q_qqic = amt->qi; 864 csum_start = (void *)mld2q; 865 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, 866 sizeof(*mld2q), 867 IPPROTO_ICMPV6, 868 csum_partial(csum_start, 869 sizeof(*mld2q), 0)); 870 871 skb->ip_summed = CHECKSUM_NONE; 872 skb_push(skb, sizeof(*eth) + sizeof(*ip6h) + sizeof(ra)); 873 return skb; 874 } 875 876 static void amt_send_mld_gq(struct amt_dev *amt, struct amt_tunnel_list *tunnel) 877 { 878 struct sk_buff *skb; 879 880 skb = amt_build_mld_gq(amt); 881 if (!skb) 882 return; 883 884 amt_skb_cb(skb)->tunnel = tunnel; 885 dev_queue_xmit(skb); 886 } 887 #else 888 static void amt_send_mld_gq(struct amt_dev *amt, struct amt_tunnel_list *tunnel) 889 { 890 } 891 #endif 892 893 static bool amt_queue_event(struct amt_dev *amt, enum amt_event event, 894 struct sk_buff *skb) 895 { 896 int index; 897 898 spin_lock_bh(&amt->lock); 899 if (amt->nr_events >= AMT_MAX_EVENTS) { 900 spin_unlock_bh(&amt->lock); 901 return 1; 902 } 903 904 index = (amt->event_idx + amt->nr_events) % AMT_MAX_EVENTS; 905 amt->events[index].event = event; 906 amt->events[index].skb = skb; 907 amt->nr_events++; 908 amt->event_idx %= AMT_MAX_EVENTS; 909 queue_work(amt_wq, &amt->event_wq); 910 spin_unlock_bh(&amt->lock); 911 912 return 0; 913 } 914 915 static void amt_secret_work(struct work_struct *work) 916 { 917 struct amt_dev *amt = container_of(to_delayed_work(work), 918 struct amt_dev, 919 secret_wq); 920 921 spin_lock_bh(&amt->lock); 922 get_random_bytes(&amt->key, sizeof(siphash_key_t)); 923 spin_unlock_bh(&amt->lock); 924 mod_delayed_work(amt_wq, &amt->secret_wq, 925 msecs_to_jiffies(AMT_SECRET_TIMEOUT)); 926 } 927 928 static void amt_event_send_discovery(struct amt_dev *amt) 929 { 930 if (amt->status > AMT_STATUS_SENT_DISCOVERY) 931 goto out; 932 get_random_bytes(&amt->nonce, sizeof(__be32)); 933 934 amt_send_discovery(amt); 935 out: 936 mod_delayed_work(amt_wq, &amt->discovery_wq, 937 msecs_to_jiffies(AMT_DISCOVERY_TIMEOUT)); 938 } 939 940 static void amt_discovery_work(struct work_struct *work) 941 { 942 struct amt_dev *amt = container_of(to_delayed_work(work), 943 struct amt_dev, 944 discovery_wq); 945 946 if (amt_queue_event(amt, AMT_EVENT_SEND_DISCOVERY, NULL)) 947 mod_delayed_work(amt_wq, &amt->discovery_wq, 948 msecs_to_jiffies(AMT_DISCOVERY_TIMEOUT)); 949 } 950 951 static void amt_event_send_request(struct amt_dev *amt) 952 { 953 u32 exp; 954 955 if (amt->status < AMT_STATUS_RECEIVED_ADVERTISEMENT) 956 goto out; 957 958 if (amt->req_cnt > AMT_MAX_REQ_COUNT) { 959 netdev_dbg(amt->dev, "Gateway is not ready"); 960 amt->qi = AMT_INIT_REQ_TIMEOUT; 961 WRITE_ONCE(amt->ready4, false); 962 WRITE_ONCE(amt->ready6, false); 963 amt->remote_ip = 0; 964 amt_update_gw_status(amt, AMT_STATUS_INIT, false); 965 amt->req_cnt = 0; 966 amt->nonce = 0; 967 goto out; 968 } 969 970 if (!amt->req_cnt) { 971 WRITE_ONCE(amt->ready4, false); 972 WRITE_ONCE(amt->ready6, false); 973 get_random_bytes(&amt->nonce, sizeof(__be32)); 974 } 975 976 amt_send_request(amt, false); 977 amt_send_request(amt, true); 978 amt_update_gw_status(amt, AMT_STATUS_SENT_REQUEST, true); 979 amt->req_cnt++; 980 out: 981 exp = min_t(u32, (1 * (1 << amt->req_cnt)), AMT_MAX_REQ_TIMEOUT); 982 mod_delayed_work(amt_wq, &amt->req_wq, msecs_to_jiffies(exp * 1000)); 983 } 984 985 static void amt_req_work(struct work_struct *work) 986 { 987 struct amt_dev *amt = container_of(to_delayed_work(work), 988 struct amt_dev, 989 req_wq); 990 991 if (amt_queue_event(amt, AMT_EVENT_SEND_REQUEST, NULL)) 992 mod_delayed_work(amt_wq, &amt->req_wq, 993 msecs_to_jiffies(100)); 994 } 995 996 static bool amt_send_membership_update(struct amt_dev *amt, 997 struct sk_buff *skb, 998 bool v6) 999 { 1000 struct amt_header_membership_update *amtmu; 1001 struct socket *sock; 1002 struct iphdr *iph; 1003 struct flowi4 fl4; 1004 struct rtable *rt; 1005 int err; 1006 1007 sock = rcu_dereference_bh(amt->sock); 1008 if (!sock) 1009 return true; 1010 1011 err = skb_cow_head(skb, LL_RESERVED_SPACE(amt->dev) + sizeof(*amtmu) + 1012 sizeof(*iph) + sizeof(struct udphdr)); 1013 if (err) 1014 return true; 1015 1016 skb_reset_inner_headers(skb); 1017 memset(&fl4, 0, sizeof(struct flowi4)); 1018 fl4.flowi4_oif = amt->stream_dev->ifindex; 1019 fl4.daddr = amt->remote_ip; 1020 fl4.saddr = amt->local_ip; 1021 fl4.flowi4_tos = AMT_TOS; 1022 fl4.flowi4_proto = IPPROTO_UDP; 1023 rt = ip_route_output_key(amt->net, &fl4); 1024 if (IS_ERR(rt)) { 1025 netdev_dbg(amt->dev, "no route to %pI4\n", &amt->remote_ip); 1026 return true; 1027 } 1028 1029 amtmu = skb_push(skb, sizeof(*amtmu)); 1030 amtmu->version = 0; 1031 amtmu->type = AMT_MSG_MEMBERSHIP_UPDATE; 1032 amtmu->reserved = 0; 1033 amtmu->nonce = amt->nonce; 1034 amtmu->response_mac = amt->mac; 1035 1036 if (!v6) 1037 skb_set_inner_protocol(skb, htons(ETH_P_IP)); 1038 else 1039 skb_set_inner_protocol(skb, htons(ETH_P_IPV6)); 1040 udp_tunnel_xmit_skb(rt, sock->sk, skb, 1041 fl4.saddr, 1042 fl4.daddr, 1043 AMT_TOS, 1044 ip4_dst_hoplimit(&rt->dst), 1045 0, 1046 amt->gw_port, 1047 amt->relay_port, 1048 false, 1049 false); 1050 amt_update_gw_status(amt, AMT_STATUS_SENT_UPDATE, true); 1051 return false; 1052 } 1053 1054 static void amt_send_multicast_data(struct amt_dev *amt, 1055 const struct sk_buff *oskb, 1056 struct amt_tunnel_list *tunnel, 1057 bool v6) 1058 { 1059 struct amt_header_mcast_data *amtmd; 1060 struct socket *sock; 1061 struct sk_buff *skb; 1062 struct iphdr *iph; 1063 struct flowi4 fl4; 1064 struct rtable *rt; 1065 1066 sock = rcu_dereference_bh(amt->sock); 1067 if (!sock) 1068 return; 1069 1070 skb = skb_copy_expand(oskb, sizeof(*amtmd) + sizeof(*iph) + 1071 sizeof(struct udphdr), 0, GFP_ATOMIC); 1072 if (!skb) 1073 return; 1074 1075 skb_reset_inner_headers(skb); 1076 memset(&fl4, 0, sizeof(struct flowi4)); 1077 fl4.flowi4_oif = amt->stream_dev->ifindex; 1078 fl4.daddr = tunnel->ip4; 1079 fl4.saddr = amt->local_ip; 1080 fl4.flowi4_proto = IPPROTO_UDP; 1081 rt = ip_route_output_key(amt->net, &fl4); 1082 if (IS_ERR(rt)) { 1083 netdev_dbg(amt->dev, "no route to %pI4\n", &tunnel->ip4); 1084 kfree_skb(skb); 1085 return; 1086 } 1087 1088 amtmd = skb_push(skb, sizeof(*amtmd)); 1089 amtmd->version = 0; 1090 amtmd->reserved = 0; 1091 amtmd->type = AMT_MSG_MULTICAST_DATA; 1092 1093 if (!v6) 1094 skb_set_inner_protocol(skb, htons(ETH_P_IP)); 1095 else 1096 skb_set_inner_protocol(skb, htons(ETH_P_IPV6)); 1097 udp_tunnel_xmit_skb(rt, sock->sk, skb, 1098 fl4.saddr, 1099 fl4.daddr, 1100 AMT_TOS, 1101 ip4_dst_hoplimit(&rt->dst), 1102 0, 1103 amt->relay_port, 1104 tunnel->source_port, 1105 false, 1106 false); 1107 } 1108 1109 static bool amt_send_membership_query(struct amt_dev *amt, 1110 struct sk_buff *skb, 1111 struct amt_tunnel_list *tunnel, 1112 bool v6) 1113 { 1114 struct amt_header_membership_query *amtmq; 1115 struct socket *sock; 1116 struct rtable *rt; 1117 struct flowi4 fl4; 1118 int err; 1119 1120 sock = rcu_dereference_bh(amt->sock); 1121 if (!sock) 1122 return true; 1123 1124 err = skb_cow_head(skb, LL_RESERVED_SPACE(amt->dev) + sizeof(*amtmq) + 1125 sizeof(struct iphdr) + sizeof(struct udphdr)); 1126 if (err) 1127 return true; 1128 1129 skb_reset_inner_headers(skb); 1130 memset(&fl4, 0, sizeof(struct flowi4)); 1131 fl4.flowi4_oif = amt->stream_dev->ifindex; 1132 fl4.daddr = tunnel->ip4; 1133 fl4.saddr = amt->local_ip; 1134 fl4.flowi4_tos = AMT_TOS; 1135 fl4.flowi4_proto = IPPROTO_UDP; 1136 rt = ip_route_output_key(amt->net, &fl4); 1137 if (IS_ERR(rt)) { 1138 netdev_dbg(amt->dev, "no route to %pI4\n", &tunnel->ip4); 1139 return true; 1140 } 1141 1142 amtmq = skb_push(skb, sizeof(*amtmq)); 1143 amtmq->version = 0; 1144 amtmq->type = AMT_MSG_MEMBERSHIP_QUERY; 1145 amtmq->reserved = 0; 1146 amtmq->l = 0; 1147 amtmq->g = 0; 1148 amtmq->nonce = tunnel->nonce; 1149 amtmq->response_mac = tunnel->mac; 1150 1151 if (!v6) 1152 skb_set_inner_protocol(skb, htons(ETH_P_IP)); 1153 else 1154 skb_set_inner_protocol(skb, htons(ETH_P_IPV6)); 1155 udp_tunnel_xmit_skb(rt, sock->sk, skb, 1156 fl4.saddr, 1157 fl4.daddr, 1158 AMT_TOS, 1159 ip4_dst_hoplimit(&rt->dst), 1160 0, 1161 amt->relay_port, 1162 tunnel->source_port, 1163 false, 1164 false); 1165 amt_update_relay_status(tunnel, AMT_STATUS_SENT_QUERY, true); 1166 return false; 1167 } 1168 1169 static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev) 1170 { 1171 struct amt_dev *amt = netdev_priv(dev); 1172 struct amt_tunnel_list *tunnel; 1173 struct amt_group_node *gnode; 1174 union amt_addr group = {0,}; 1175 #if IS_ENABLED(CONFIG_IPV6) 1176 struct ipv6hdr *ip6h; 1177 struct mld_msg *mld; 1178 #endif 1179 bool report = false; 1180 struct igmphdr *ih; 1181 bool query = false; 1182 struct iphdr *iph; 1183 bool data = false; 1184 bool v6 = false; 1185 u32 hash; 1186 1187 iph = ip_hdr(skb); 1188 if (iph->version == 4) { 1189 if (!ipv4_is_multicast(iph->daddr)) 1190 goto free; 1191 1192 if (!ip_mc_check_igmp(skb)) { 1193 ih = igmp_hdr(skb); 1194 switch (ih->type) { 1195 case IGMPV3_HOST_MEMBERSHIP_REPORT: 1196 case IGMP_HOST_MEMBERSHIP_REPORT: 1197 report = true; 1198 break; 1199 case IGMP_HOST_MEMBERSHIP_QUERY: 1200 query = true; 1201 break; 1202 default: 1203 goto free; 1204 } 1205 } else { 1206 data = true; 1207 } 1208 v6 = false; 1209 group.ip4 = iph->daddr; 1210 #if IS_ENABLED(CONFIG_IPV6) 1211 } else if (iph->version == 6) { 1212 ip6h = ipv6_hdr(skb); 1213 if (!ipv6_addr_is_multicast(&ip6h->daddr)) 1214 goto free; 1215 1216 if (!ipv6_mc_check_mld(skb)) { 1217 mld = (struct mld_msg *)skb_transport_header(skb); 1218 switch (mld->mld_type) { 1219 case ICMPV6_MGM_REPORT: 1220 case ICMPV6_MLD2_REPORT: 1221 report = true; 1222 break; 1223 case ICMPV6_MGM_QUERY: 1224 query = true; 1225 break; 1226 default: 1227 goto free; 1228 } 1229 } else { 1230 data = true; 1231 } 1232 v6 = true; 1233 group.ip6 = ip6h->daddr; 1234 #endif 1235 } else { 1236 dev->stats.tx_errors++; 1237 goto free; 1238 } 1239 1240 if (!pskb_may_pull(skb, sizeof(struct ethhdr))) 1241 goto free; 1242 1243 skb_pull(skb, sizeof(struct ethhdr)); 1244 1245 if (amt->mode == AMT_MODE_GATEWAY) { 1246 /* Gateway only passes IGMP/MLD packets */ 1247 if (!report) 1248 goto free; 1249 if ((!v6 && !READ_ONCE(amt->ready4)) || 1250 (v6 && !READ_ONCE(amt->ready6))) 1251 goto free; 1252 if (amt_send_membership_update(amt, skb, v6)) 1253 goto free; 1254 goto unlock; 1255 } else if (amt->mode == AMT_MODE_RELAY) { 1256 if (query) { 1257 tunnel = amt_skb_cb(skb)->tunnel; 1258 if (!tunnel) { 1259 WARN_ON(1); 1260 goto free; 1261 } 1262 1263 /* Do not forward unexpected query */ 1264 if (amt_send_membership_query(amt, skb, tunnel, v6)) 1265 goto free; 1266 goto unlock; 1267 } 1268 1269 if (!data) 1270 goto free; 1271 list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) { 1272 hash = amt_group_hash(tunnel, &group); 1273 hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash], 1274 node) { 1275 if (!v6) { 1276 if (gnode->group_addr.ip4 == iph->daddr) 1277 goto found; 1278 #if IS_ENABLED(CONFIG_IPV6) 1279 } else { 1280 if (ipv6_addr_equal(&gnode->group_addr.ip6, 1281 &ip6h->daddr)) 1282 goto found; 1283 #endif 1284 } 1285 } 1286 continue; 1287 found: 1288 amt_send_multicast_data(amt, skb, tunnel, v6); 1289 } 1290 } 1291 1292 dev_kfree_skb(skb); 1293 return NETDEV_TX_OK; 1294 free: 1295 dev_kfree_skb(skb); 1296 unlock: 1297 dev->stats.tx_dropped++; 1298 return NETDEV_TX_OK; 1299 } 1300 1301 static int amt_parse_type(struct sk_buff *skb) 1302 { 1303 struct amt_header *amth; 1304 1305 if (!pskb_may_pull(skb, sizeof(struct udphdr) + 1306 sizeof(struct amt_header))) 1307 return -1; 1308 1309 amth = (struct amt_header *)(udp_hdr(skb) + 1); 1310 1311 if (amth->version != 0) 1312 return -1; 1313 1314 if (amth->type >= __AMT_MSG_MAX || !amth->type) 1315 return -1; 1316 return amth->type; 1317 } 1318 1319 static void amt_clear_groups(struct amt_tunnel_list *tunnel) 1320 { 1321 struct amt_dev *amt = tunnel->amt; 1322 struct amt_group_node *gnode; 1323 struct hlist_node *t; 1324 int i; 1325 1326 spin_lock_bh(&tunnel->lock); 1327 rcu_read_lock(); 1328 for (i = 0; i < amt->hash_buckets; i++) 1329 hlist_for_each_entry_safe(gnode, t, &tunnel->groups[i], node) 1330 amt_del_group(amt, gnode); 1331 rcu_read_unlock(); 1332 spin_unlock_bh(&tunnel->lock); 1333 } 1334 1335 static void amt_tunnel_expire(struct work_struct *work) 1336 { 1337 struct amt_tunnel_list *tunnel = container_of(to_delayed_work(work), 1338 struct amt_tunnel_list, 1339 gc_wq); 1340 struct amt_dev *amt = tunnel->amt; 1341 1342 spin_lock_bh(&amt->lock); 1343 rcu_read_lock(); 1344 list_del_rcu(&tunnel->list); 1345 amt->nr_tunnels--; 1346 amt_clear_groups(tunnel); 1347 rcu_read_unlock(); 1348 spin_unlock_bh(&amt->lock); 1349 kfree_rcu(tunnel, rcu); 1350 } 1351 1352 static void amt_cleanup_srcs(struct amt_dev *amt, 1353 struct amt_tunnel_list *tunnel, 1354 struct amt_group_node *gnode) 1355 { 1356 struct amt_source_node *snode; 1357 struct hlist_node *t; 1358 int i; 1359 1360 /* Delete old sources */ 1361 for (i = 0; i < amt->hash_buckets; i++) { 1362 hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) { 1363 if (snode->flags == AMT_SOURCE_OLD) 1364 amt_destroy_source(snode); 1365 } 1366 } 1367 1368 /* switch from new to old */ 1369 for (i = 0; i < amt->hash_buckets; i++) { 1370 hlist_for_each_entry_rcu(snode, &gnode->sources[i], node) { 1371 snode->flags = AMT_SOURCE_OLD; 1372 if (!gnode->v6) 1373 netdev_dbg(snode->gnode->amt->dev, 1374 "Add source as OLD %pI4 from %pI4\n", 1375 &snode->source_addr.ip4, 1376 &gnode->group_addr.ip4); 1377 #if IS_ENABLED(CONFIG_IPV6) 1378 else 1379 netdev_dbg(snode->gnode->amt->dev, 1380 "Add source as OLD %pI6 from %pI6\n", 1381 &snode->source_addr.ip6, 1382 &gnode->group_addr.ip6); 1383 #endif 1384 } 1385 } 1386 } 1387 1388 static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel, 1389 struct amt_group_node *gnode, void *grec, 1390 bool v6) 1391 { 1392 struct igmpv3_grec *igmp_grec; 1393 struct amt_source_node *snode; 1394 #if IS_ENABLED(CONFIG_IPV6) 1395 struct mld2_grec *mld_grec; 1396 #endif 1397 union amt_addr src = {0,}; 1398 u16 nsrcs; 1399 u32 hash; 1400 int i; 1401 1402 if (!v6) { 1403 igmp_grec = grec; 1404 nsrcs = ntohs(igmp_grec->grec_nsrcs); 1405 } else { 1406 #if IS_ENABLED(CONFIG_IPV6) 1407 mld_grec = grec; 1408 nsrcs = ntohs(mld_grec->grec_nsrcs); 1409 #else 1410 return; 1411 #endif 1412 } 1413 for (i = 0; i < nsrcs; i++) { 1414 if (tunnel->nr_sources >= amt->max_sources) 1415 return; 1416 if (!v6) 1417 src.ip4 = igmp_grec->grec_src[i]; 1418 #if IS_ENABLED(CONFIG_IPV6) 1419 else 1420 memcpy(&src.ip6, &mld_grec->grec_src[i], 1421 sizeof(struct in6_addr)); 1422 #endif 1423 if (amt_lookup_src(tunnel, gnode, AMT_FILTER_ALL, &src)) 1424 continue; 1425 1426 snode = amt_alloc_snode(gnode, &src); 1427 if (snode) { 1428 hash = amt_source_hash(tunnel, &snode->source_addr); 1429 hlist_add_head_rcu(&snode->node, &gnode->sources[hash]); 1430 tunnel->nr_sources++; 1431 gnode->nr_sources++; 1432 1433 if (!gnode->v6) 1434 netdev_dbg(snode->gnode->amt->dev, 1435 "Add source as NEW %pI4 from %pI4\n", 1436 &snode->source_addr.ip4, 1437 &gnode->group_addr.ip4); 1438 #if IS_ENABLED(CONFIG_IPV6) 1439 else 1440 netdev_dbg(snode->gnode->amt->dev, 1441 "Add source as NEW %pI6 from %pI6\n", 1442 &snode->source_addr.ip6, 1443 &gnode->group_addr.ip6); 1444 #endif 1445 } 1446 } 1447 } 1448 1449 /* Router State Report Rec'd New Router State 1450 * ------------ ------------ ---------------- 1451 * EXCLUDE (X,Y) IS_IN (A) EXCLUDE (X+A,Y-A) 1452 * 1453 * -----------+-----------+-----------+ 1454 * | OLD | NEW | 1455 * -----------+-----------+-----------+ 1456 * FWD | X | X+A | 1457 * -----------+-----------+-----------+ 1458 * D_FWD | Y | Y-A | 1459 * -----------+-----------+-----------+ 1460 * NONE | | A | 1461 * -----------+-----------+-----------+ 1462 * 1463 * a) Received sources are NONE/NEW 1464 * b) All NONE will be deleted by amt_cleanup_srcs(). 1465 * c) All OLD will be deleted by amt_cleanup_srcs(). 1466 * d) After delete, NEW source will be switched to OLD. 1467 */ 1468 static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel, 1469 struct amt_group_node *gnode, 1470 void *grec, 1471 enum amt_ops ops, 1472 enum amt_filter filter, 1473 enum amt_act act, 1474 bool v6) 1475 { 1476 struct amt_dev *amt = tunnel->amt; 1477 struct amt_source_node *snode; 1478 struct igmpv3_grec *igmp_grec; 1479 #if IS_ENABLED(CONFIG_IPV6) 1480 struct mld2_grec *mld_grec; 1481 #endif 1482 union amt_addr src = {0,}; 1483 struct hlist_node *t; 1484 u16 nsrcs; 1485 int i, j; 1486 1487 if (!v6) { 1488 igmp_grec = grec; 1489 nsrcs = ntohs(igmp_grec->grec_nsrcs); 1490 } else { 1491 #if IS_ENABLED(CONFIG_IPV6) 1492 mld_grec = grec; 1493 nsrcs = ntohs(mld_grec->grec_nsrcs); 1494 #else 1495 return; 1496 #endif 1497 } 1498 1499 memset(&src, 0, sizeof(union amt_addr)); 1500 switch (ops) { 1501 case AMT_OPS_INT: 1502 /* A*B */ 1503 for (i = 0; i < nsrcs; i++) { 1504 if (!v6) 1505 src.ip4 = igmp_grec->grec_src[i]; 1506 #if IS_ENABLED(CONFIG_IPV6) 1507 else 1508 memcpy(&src.ip6, &mld_grec->grec_src[i], 1509 sizeof(struct in6_addr)); 1510 #endif 1511 snode = amt_lookup_src(tunnel, gnode, filter, &src); 1512 if (!snode) 1513 continue; 1514 amt_act_src(tunnel, gnode, snode, act); 1515 } 1516 break; 1517 case AMT_OPS_UNI: 1518 /* A+B */ 1519 for (i = 0; i < amt->hash_buckets; i++) { 1520 hlist_for_each_entry_safe(snode, t, &gnode->sources[i], 1521 node) { 1522 if (amt_status_filter(snode, filter)) 1523 amt_act_src(tunnel, gnode, snode, act); 1524 } 1525 } 1526 for (i = 0; i < nsrcs; i++) { 1527 if (!v6) 1528 src.ip4 = igmp_grec->grec_src[i]; 1529 #if IS_ENABLED(CONFIG_IPV6) 1530 else 1531 memcpy(&src.ip6, &mld_grec->grec_src[i], 1532 sizeof(struct in6_addr)); 1533 #endif 1534 snode = amt_lookup_src(tunnel, gnode, filter, &src); 1535 if (!snode) 1536 continue; 1537 amt_act_src(tunnel, gnode, snode, act); 1538 } 1539 break; 1540 case AMT_OPS_SUB: 1541 /* A-B */ 1542 for (i = 0; i < amt->hash_buckets; i++) { 1543 hlist_for_each_entry_safe(snode, t, &gnode->sources[i], 1544 node) { 1545 if (!amt_status_filter(snode, filter)) 1546 continue; 1547 for (j = 0; j < nsrcs; j++) { 1548 if (!v6) 1549 src.ip4 = igmp_grec->grec_src[j]; 1550 #if IS_ENABLED(CONFIG_IPV6) 1551 else 1552 memcpy(&src.ip6, 1553 &mld_grec->grec_src[j], 1554 sizeof(struct in6_addr)); 1555 #endif 1556 if (amt_addr_equal(&snode->source_addr, 1557 &src)) 1558 goto out_sub; 1559 } 1560 amt_act_src(tunnel, gnode, snode, act); 1561 continue; 1562 out_sub:; 1563 } 1564 } 1565 break; 1566 case AMT_OPS_SUB_REV: 1567 /* B-A */ 1568 for (i = 0; i < nsrcs; i++) { 1569 if (!v6) 1570 src.ip4 = igmp_grec->grec_src[i]; 1571 #if IS_ENABLED(CONFIG_IPV6) 1572 else 1573 memcpy(&src.ip6, &mld_grec->grec_src[i], 1574 sizeof(struct in6_addr)); 1575 #endif 1576 snode = amt_lookup_src(tunnel, gnode, AMT_FILTER_ALL, 1577 &src); 1578 if (!snode) { 1579 snode = amt_lookup_src(tunnel, gnode, 1580 filter, &src); 1581 if (snode) 1582 amt_act_src(tunnel, gnode, snode, act); 1583 } 1584 } 1585 break; 1586 default: 1587 netdev_dbg(amt->dev, "Invalid type\n"); 1588 return; 1589 } 1590 } 1591 1592 static void amt_mcast_is_in_handler(struct amt_dev *amt, 1593 struct amt_tunnel_list *tunnel, 1594 struct amt_group_node *gnode, 1595 void *grec, void *zero_grec, bool v6) 1596 { 1597 if (gnode->filter_mode == MCAST_INCLUDE) { 1598 /* Router State Report Rec'd New Router State Actions 1599 * ------------ ------------ ---------------- ------- 1600 * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI 1601 */ 1602 /* Update IS_IN (B) as FWD/NEW */ 1603 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1604 AMT_FILTER_NONE_NEW, 1605 AMT_ACT_STATUS_FWD_NEW, 1606 v6); 1607 /* Update INCLUDE (A) as NEW */ 1608 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1609 AMT_FILTER_FWD, 1610 AMT_ACT_STATUS_FWD_NEW, 1611 v6); 1612 /* (B)=GMI */ 1613 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1614 AMT_FILTER_FWD_NEW, 1615 AMT_ACT_GMI, 1616 v6); 1617 } else { 1618 /* State Actions 1619 * ------------ ------------ ---------------- ------- 1620 * EXCLUDE (X,Y) IS_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 1621 */ 1622 /* Update (A) in (X, Y) as NONE/NEW */ 1623 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1624 AMT_FILTER_BOTH, 1625 AMT_ACT_STATUS_NONE_NEW, 1626 v6); 1627 /* Update FWD/OLD as FWD/NEW */ 1628 amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, 1629 AMT_FILTER_FWD, 1630 AMT_ACT_STATUS_FWD_NEW, 1631 v6); 1632 /* Update IS_IN (A) as FWD/NEW */ 1633 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1634 AMT_FILTER_NONE_NEW, 1635 AMT_ACT_STATUS_FWD_NEW, 1636 v6); 1637 /* Update EXCLUDE (, Y-A) as D_FWD_NEW */ 1638 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB, 1639 AMT_FILTER_D_FWD, 1640 AMT_ACT_STATUS_D_FWD_NEW, 1641 v6); 1642 } 1643 } 1644 1645 static void amt_mcast_is_ex_handler(struct amt_dev *amt, 1646 struct amt_tunnel_list *tunnel, 1647 struct amt_group_node *gnode, 1648 void *grec, void *zero_grec, bool v6) 1649 { 1650 if (gnode->filter_mode == MCAST_INCLUDE) { 1651 /* Router State Report Rec'd New Router State Actions 1652 * ------------ ------------ ---------------- ------- 1653 * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 1654 * Delete (A-B) 1655 * Group Timer=GMI 1656 */ 1657 /* EXCLUDE(A*B, ) */ 1658 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1659 AMT_FILTER_FWD, 1660 AMT_ACT_STATUS_FWD_NEW, 1661 v6); 1662 /* EXCLUDE(, B-A) */ 1663 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1664 AMT_FILTER_FWD, 1665 AMT_ACT_STATUS_D_FWD_NEW, 1666 v6); 1667 /* (B-A)=0 */ 1668 amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, 1669 AMT_FILTER_D_FWD_NEW, 1670 AMT_ACT_GMI_ZERO, 1671 v6); 1672 /* Group Timer=GMI */ 1673 if (!mod_delayed_work(amt_wq, &gnode->group_timer, 1674 msecs_to_jiffies(amt_gmi(amt)))) 1675 dev_hold(amt->dev); 1676 gnode->filter_mode = MCAST_EXCLUDE; 1677 /* Delete (A-B) will be worked by amt_cleanup_srcs(). */ 1678 } else { 1679 /* Router State Report Rec'd New Router State Actions 1680 * ------------ ------------ ---------------- ------- 1681 * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI 1682 * Delete (X-A) 1683 * Delete (Y-A) 1684 * Group Timer=GMI 1685 */ 1686 /* EXCLUDE (A-Y, ) */ 1687 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1688 AMT_FILTER_D_FWD, 1689 AMT_ACT_STATUS_FWD_NEW, 1690 v6); 1691 /* EXCLUDE (, Y*A ) */ 1692 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1693 AMT_FILTER_D_FWD, 1694 AMT_ACT_STATUS_D_FWD_NEW, 1695 v6); 1696 /* (A-X-Y)=GMI */ 1697 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1698 AMT_FILTER_BOTH_NEW, 1699 AMT_ACT_GMI, 1700 v6); 1701 /* Group Timer=GMI */ 1702 if (!mod_delayed_work(amt_wq, &gnode->group_timer, 1703 msecs_to_jiffies(amt_gmi(amt)))) 1704 dev_hold(amt->dev); 1705 /* Delete (X-A), (Y-A) will be worked by amt_cleanup_srcs(). */ 1706 } 1707 } 1708 1709 static void amt_mcast_to_in_handler(struct amt_dev *amt, 1710 struct amt_tunnel_list *tunnel, 1711 struct amt_group_node *gnode, 1712 void *grec, void *zero_grec, bool v6) 1713 { 1714 if (gnode->filter_mode == MCAST_INCLUDE) { 1715 /* Router State Report Rec'd New Router State Actions 1716 * ------------ ------------ ---------------- ------- 1717 * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI 1718 * Send Q(G,A-B) 1719 */ 1720 /* Update TO_IN (B) sources as FWD/NEW */ 1721 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1722 AMT_FILTER_NONE_NEW, 1723 AMT_ACT_STATUS_FWD_NEW, 1724 v6); 1725 /* Update INCLUDE (A) sources as NEW */ 1726 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1727 AMT_FILTER_FWD, 1728 AMT_ACT_STATUS_FWD_NEW, 1729 v6); 1730 /* (B)=GMI */ 1731 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1732 AMT_FILTER_FWD_NEW, 1733 AMT_ACT_GMI, 1734 v6); 1735 } else { 1736 /* Router State Report Rec'd New Router State Actions 1737 * ------------ ------------ ---------------- ------- 1738 * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI 1739 * Send Q(G,X-A) 1740 * Send Q(G) 1741 */ 1742 /* Update TO_IN (A) sources as FWD/NEW */ 1743 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1744 AMT_FILTER_NONE_NEW, 1745 AMT_ACT_STATUS_FWD_NEW, 1746 v6); 1747 /* Update EXCLUDE(X,) sources as FWD/NEW */ 1748 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1749 AMT_FILTER_FWD, 1750 AMT_ACT_STATUS_FWD_NEW, 1751 v6); 1752 /* EXCLUDE (, Y-A) 1753 * (A) are already switched to FWD_NEW. 1754 * So, D_FWD/OLD -> D_FWD/NEW is okay. 1755 */ 1756 amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, 1757 AMT_FILTER_D_FWD, 1758 AMT_ACT_STATUS_D_FWD_NEW, 1759 v6); 1760 /* (A)=GMI 1761 * Only FWD_NEW will have (A) sources. 1762 */ 1763 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1764 AMT_FILTER_FWD_NEW, 1765 AMT_ACT_GMI, 1766 v6); 1767 } 1768 } 1769 1770 static void amt_mcast_to_ex_handler(struct amt_dev *amt, 1771 struct amt_tunnel_list *tunnel, 1772 struct amt_group_node *gnode, 1773 void *grec, void *zero_grec, bool v6) 1774 { 1775 if (gnode->filter_mode == MCAST_INCLUDE) { 1776 /* Router State Report Rec'd New Router State Actions 1777 * ------------ ------------ ---------------- ------- 1778 * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 1779 * Delete (A-B) 1780 * Send Q(G,A*B) 1781 * Group Timer=GMI 1782 */ 1783 /* EXCLUDE (A*B, ) */ 1784 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1785 AMT_FILTER_FWD, 1786 AMT_ACT_STATUS_FWD_NEW, 1787 v6); 1788 /* EXCLUDE (, B-A) */ 1789 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1790 AMT_FILTER_FWD, 1791 AMT_ACT_STATUS_D_FWD_NEW, 1792 v6); 1793 /* (B-A)=0 */ 1794 amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, 1795 AMT_FILTER_D_FWD_NEW, 1796 AMT_ACT_GMI_ZERO, 1797 v6); 1798 /* Group Timer=GMI */ 1799 if (!mod_delayed_work(amt_wq, &gnode->group_timer, 1800 msecs_to_jiffies(amt_gmi(amt)))) 1801 dev_hold(amt->dev); 1802 gnode->filter_mode = MCAST_EXCLUDE; 1803 /* Delete (A-B) will be worked by amt_cleanup_srcs(). */ 1804 } else { 1805 /* Router State Report Rec'd New Router State Actions 1806 * ------------ ------------ ---------------- ------- 1807 * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer 1808 * Delete (X-A) 1809 * Delete (Y-A) 1810 * Send Q(G,A-Y) 1811 * Group Timer=GMI 1812 */ 1813 /* Update (A-X-Y) as NONE/OLD */ 1814 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1815 AMT_FILTER_BOTH, 1816 AMT_ACT_GT, 1817 v6); 1818 /* EXCLUDE (A-Y, ) */ 1819 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1820 AMT_FILTER_D_FWD, 1821 AMT_ACT_STATUS_FWD_NEW, 1822 v6); 1823 /* EXCLUDE (, Y*A) */ 1824 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1825 AMT_FILTER_D_FWD, 1826 AMT_ACT_STATUS_D_FWD_NEW, 1827 v6); 1828 /* Group Timer=GMI */ 1829 if (!mod_delayed_work(amt_wq, &gnode->group_timer, 1830 msecs_to_jiffies(amt_gmi(amt)))) 1831 dev_hold(amt->dev); 1832 /* Delete (X-A), (Y-A) will be worked by amt_cleanup_srcs(). */ 1833 } 1834 } 1835 1836 static void amt_mcast_allow_handler(struct amt_dev *amt, 1837 struct amt_tunnel_list *tunnel, 1838 struct amt_group_node *gnode, 1839 void *grec, void *zero_grec, bool v6) 1840 { 1841 if (gnode->filter_mode == MCAST_INCLUDE) { 1842 /* Router State Report Rec'd New Router State Actions 1843 * ------------ ------------ ---------------- ------- 1844 * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI 1845 */ 1846 /* INCLUDE (A+B) */ 1847 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1848 AMT_FILTER_FWD, 1849 AMT_ACT_STATUS_FWD_NEW, 1850 v6); 1851 /* (B)=GMI */ 1852 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1853 AMT_FILTER_FWD_NEW, 1854 AMT_ACT_GMI, 1855 v6); 1856 } else { 1857 /* Router State Report Rec'd New Router State Actions 1858 * ------------ ------------ ---------------- ------- 1859 * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI 1860 */ 1861 /* EXCLUDE (X+A, ) */ 1862 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1863 AMT_FILTER_FWD, 1864 AMT_ACT_STATUS_FWD_NEW, 1865 v6); 1866 /* EXCLUDE (, Y-A) */ 1867 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB, 1868 AMT_FILTER_D_FWD, 1869 AMT_ACT_STATUS_D_FWD_NEW, 1870 v6); 1871 /* (A)=GMI 1872 * All (A) source are now FWD/NEW status. 1873 */ 1874 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, 1875 AMT_FILTER_FWD_NEW, 1876 AMT_ACT_GMI, 1877 v6); 1878 } 1879 } 1880 1881 static void amt_mcast_block_handler(struct amt_dev *amt, 1882 struct amt_tunnel_list *tunnel, 1883 struct amt_group_node *gnode, 1884 void *grec, void *zero_grec, bool v6) 1885 { 1886 if (gnode->filter_mode == MCAST_INCLUDE) { 1887 /* Router State Report Rec'd New Router State Actions 1888 * ------------ ------------ ---------------- ------- 1889 * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) 1890 */ 1891 /* INCLUDE (A) */ 1892 amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, 1893 AMT_FILTER_FWD, 1894 AMT_ACT_STATUS_FWD_NEW, 1895 v6); 1896 } else { 1897 /* Router State Report Rec'd New Router State Actions 1898 * ------------ ------------ ---------------- ------- 1899 * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer 1900 * Send Q(G,A-Y) 1901 */ 1902 /* (A-X-Y)=Group Timer */ 1903 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1904 AMT_FILTER_BOTH, 1905 AMT_ACT_GT, 1906 v6); 1907 /* EXCLUDE (X, ) */ 1908 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1909 AMT_FILTER_FWD, 1910 AMT_ACT_STATUS_FWD_NEW, 1911 v6); 1912 /* EXCLUDE (X+(A-Y) */ 1913 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, 1914 AMT_FILTER_D_FWD, 1915 AMT_ACT_STATUS_FWD_NEW, 1916 v6); 1917 /* EXCLUDE (, Y) */ 1918 amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, 1919 AMT_FILTER_D_FWD, 1920 AMT_ACT_STATUS_D_FWD_NEW, 1921 v6); 1922 } 1923 } 1924 1925 /* RFC 3376 1926 * 7.3.2. In the Presence of Older Version Group Members 1927 * 1928 * When Group Compatibility Mode is IGMPv2, a router internally 1929 * translates the following IGMPv2 messages for that group to their 1930 * IGMPv3 equivalents: 1931 * 1932 * IGMPv2 Message IGMPv3 Equivalent 1933 * -------------- ----------------- 1934 * Report IS_EX( {} ) 1935 * Leave TO_IN( {} ) 1936 */ 1937 static void amt_igmpv2_report_handler(struct amt_dev *amt, struct sk_buff *skb, 1938 struct amt_tunnel_list *tunnel) 1939 { 1940 struct igmphdr *ih = igmp_hdr(skb); 1941 struct iphdr *iph = ip_hdr(skb); 1942 struct amt_group_node *gnode; 1943 union amt_addr group, host; 1944 1945 memset(&group, 0, sizeof(union amt_addr)); 1946 group.ip4 = ih->group; 1947 memset(&host, 0, sizeof(union amt_addr)); 1948 host.ip4 = iph->saddr; 1949 1950 gnode = amt_lookup_group(tunnel, &group, &host, false); 1951 if (!gnode) { 1952 gnode = amt_add_group(amt, tunnel, &group, &host, false); 1953 if (!IS_ERR(gnode)) { 1954 gnode->filter_mode = MCAST_EXCLUDE; 1955 if (!mod_delayed_work(amt_wq, &gnode->group_timer, 1956 msecs_to_jiffies(amt_gmi(amt)))) 1957 dev_hold(amt->dev); 1958 } 1959 } 1960 } 1961 1962 /* RFC 3376 1963 * 7.3.2. In the Presence of Older Version Group Members 1964 * 1965 * When Group Compatibility Mode is IGMPv2, a router internally 1966 * translates the following IGMPv2 messages for that group to their 1967 * IGMPv3 equivalents: 1968 * 1969 * IGMPv2 Message IGMPv3 Equivalent 1970 * -------------- ----------------- 1971 * Report IS_EX( {} ) 1972 * Leave TO_IN( {} ) 1973 */ 1974 static void amt_igmpv2_leave_handler(struct amt_dev *amt, struct sk_buff *skb, 1975 struct amt_tunnel_list *tunnel) 1976 { 1977 struct igmphdr *ih = igmp_hdr(skb); 1978 struct iphdr *iph = ip_hdr(skb); 1979 struct amt_group_node *gnode; 1980 union amt_addr group, host; 1981 1982 memset(&group, 0, sizeof(union amt_addr)); 1983 group.ip4 = ih->group; 1984 memset(&host, 0, sizeof(union amt_addr)); 1985 host.ip4 = iph->saddr; 1986 1987 gnode = amt_lookup_group(tunnel, &group, &host, false); 1988 if (gnode) 1989 amt_del_group(amt, gnode); 1990 } 1991 1992 static void amt_igmpv3_report_handler(struct amt_dev *amt, struct sk_buff *skb, 1993 struct amt_tunnel_list *tunnel) 1994 { 1995 struct igmpv3_report *ihrv3 = igmpv3_report_hdr(skb); 1996 int len = skb_transport_offset(skb) + sizeof(*ihrv3); 1997 void *zero_grec = (void *)&igmpv3_zero_grec; 1998 struct iphdr *iph = ip_hdr(skb); 1999 struct amt_group_node *gnode; 2000 union amt_addr group, host; 2001 struct igmpv3_grec *grec; 2002 u16 nsrcs; 2003 int i; 2004 2005 for (i = 0; i < ntohs(ihrv3->ngrec); i++) { 2006 len += sizeof(*grec); 2007 if (!ip_mc_may_pull(skb, len)) 2008 break; 2009 2010 grec = (void *)(skb->data + len - sizeof(*grec)); 2011 nsrcs = ntohs(grec->grec_nsrcs); 2012 2013 len += nsrcs * sizeof(__be32); 2014 if (!ip_mc_may_pull(skb, len)) 2015 break; 2016 2017 memset(&group, 0, sizeof(union amt_addr)); 2018 group.ip4 = grec->grec_mca; 2019 memset(&host, 0, sizeof(union amt_addr)); 2020 host.ip4 = iph->saddr; 2021 gnode = amt_lookup_group(tunnel, &group, &host, false); 2022 if (!gnode) { 2023 gnode = amt_add_group(amt, tunnel, &group, &host, 2024 false); 2025 if (IS_ERR(gnode)) 2026 continue; 2027 } 2028 2029 amt_add_srcs(amt, tunnel, gnode, grec, false); 2030 switch (grec->grec_type) { 2031 case IGMPV3_MODE_IS_INCLUDE: 2032 amt_mcast_is_in_handler(amt, tunnel, gnode, grec, 2033 zero_grec, false); 2034 break; 2035 case IGMPV3_MODE_IS_EXCLUDE: 2036 amt_mcast_is_ex_handler(amt, tunnel, gnode, grec, 2037 zero_grec, false); 2038 break; 2039 case IGMPV3_CHANGE_TO_INCLUDE: 2040 amt_mcast_to_in_handler(amt, tunnel, gnode, grec, 2041 zero_grec, false); 2042 break; 2043 case IGMPV3_CHANGE_TO_EXCLUDE: 2044 amt_mcast_to_ex_handler(amt, tunnel, gnode, grec, 2045 zero_grec, false); 2046 break; 2047 case IGMPV3_ALLOW_NEW_SOURCES: 2048 amt_mcast_allow_handler(amt, tunnel, gnode, grec, 2049 zero_grec, false); 2050 break; 2051 case IGMPV3_BLOCK_OLD_SOURCES: 2052 amt_mcast_block_handler(amt, tunnel, gnode, grec, 2053 zero_grec, false); 2054 break; 2055 default: 2056 break; 2057 } 2058 amt_cleanup_srcs(amt, tunnel, gnode); 2059 } 2060 } 2061 2062 /* caller held tunnel->lock */ 2063 static void amt_igmp_report_handler(struct amt_dev *amt, struct sk_buff *skb, 2064 struct amt_tunnel_list *tunnel) 2065 { 2066 struct igmphdr *ih = igmp_hdr(skb); 2067 2068 switch (ih->type) { 2069 case IGMPV3_HOST_MEMBERSHIP_REPORT: 2070 amt_igmpv3_report_handler(amt, skb, tunnel); 2071 break; 2072 case IGMPV2_HOST_MEMBERSHIP_REPORT: 2073 amt_igmpv2_report_handler(amt, skb, tunnel); 2074 break; 2075 case IGMP_HOST_LEAVE_MESSAGE: 2076 amt_igmpv2_leave_handler(amt, skb, tunnel); 2077 break; 2078 default: 2079 break; 2080 } 2081 } 2082 2083 #if IS_ENABLED(CONFIG_IPV6) 2084 /* RFC 3810 2085 * 8.3.2. In the Presence of MLDv1 Multicast Address Listeners 2086 * 2087 * When Multicast Address Compatibility Mode is MLDv2, a router acts 2088 * using the MLDv2 protocol for that multicast address. When Multicast 2089 * Address Compatibility Mode is MLDv1, a router internally translates 2090 * the following MLDv1 messages for that multicast address to their 2091 * MLDv2 equivalents: 2092 * 2093 * MLDv1 Message MLDv2 Equivalent 2094 * -------------- ----------------- 2095 * Report IS_EX( {} ) 2096 * Done TO_IN( {} ) 2097 */ 2098 static void amt_mldv1_report_handler(struct amt_dev *amt, struct sk_buff *skb, 2099 struct amt_tunnel_list *tunnel) 2100 { 2101 struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb); 2102 struct ipv6hdr *ip6h = ipv6_hdr(skb); 2103 struct amt_group_node *gnode; 2104 union amt_addr group, host; 2105 2106 memcpy(&group.ip6, &mld->mld_mca, sizeof(struct in6_addr)); 2107 memcpy(&host.ip6, &ip6h->saddr, sizeof(struct in6_addr)); 2108 2109 gnode = amt_lookup_group(tunnel, &group, &host, true); 2110 if (!gnode) { 2111 gnode = amt_add_group(amt, tunnel, &group, &host, true); 2112 if (!IS_ERR(gnode)) { 2113 gnode->filter_mode = MCAST_EXCLUDE; 2114 if (!mod_delayed_work(amt_wq, &gnode->group_timer, 2115 msecs_to_jiffies(amt_gmi(amt)))) 2116 dev_hold(amt->dev); 2117 } 2118 } 2119 } 2120 2121 /* RFC 3810 2122 * 8.3.2. In the Presence of MLDv1 Multicast Address Listeners 2123 * 2124 * When Multicast Address Compatibility Mode is MLDv2, a router acts 2125 * using the MLDv2 protocol for that multicast address. When Multicast 2126 * Address Compatibility Mode is MLDv1, a router internally translates 2127 * the following MLDv1 messages for that multicast address to their 2128 * MLDv2 equivalents: 2129 * 2130 * MLDv1 Message MLDv2 Equivalent 2131 * -------------- ----------------- 2132 * Report IS_EX( {} ) 2133 * Done TO_IN( {} ) 2134 */ 2135 static void amt_mldv1_leave_handler(struct amt_dev *amt, struct sk_buff *skb, 2136 struct amt_tunnel_list *tunnel) 2137 { 2138 struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb); 2139 struct iphdr *iph = ip_hdr(skb); 2140 struct amt_group_node *gnode; 2141 union amt_addr group, host; 2142 2143 memcpy(&group.ip6, &mld->mld_mca, sizeof(struct in6_addr)); 2144 memset(&host, 0, sizeof(union amt_addr)); 2145 host.ip4 = iph->saddr; 2146 2147 gnode = amt_lookup_group(tunnel, &group, &host, true); 2148 if (gnode) { 2149 amt_del_group(amt, gnode); 2150 return; 2151 } 2152 } 2153 2154 static void amt_mldv2_report_handler(struct amt_dev *amt, struct sk_buff *skb, 2155 struct amt_tunnel_list *tunnel) 2156 { 2157 struct mld2_report *mld2r = (struct mld2_report *)icmp6_hdr(skb); 2158 int len = skb_transport_offset(skb) + sizeof(*mld2r); 2159 void *zero_grec = (void *)&mldv2_zero_grec; 2160 struct ipv6hdr *ip6h = ipv6_hdr(skb); 2161 struct amt_group_node *gnode; 2162 union amt_addr group, host; 2163 struct mld2_grec *grec; 2164 u16 nsrcs; 2165 int i; 2166 2167 for (i = 0; i < ntohs(mld2r->mld2r_ngrec); i++) { 2168 len += sizeof(*grec); 2169 if (!ipv6_mc_may_pull(skb, len)) 2170 break; 2171 2172 grec = (void *)(skb->data + len - sizeof(*grec)); 2173 nsrcs = ntohs(grec->grec_nsrcs); 2174 2175 len += nsrcs * sizeof(struct in6_addr); 2176 if (!ipv6_mc_may_pull(skb, len)) 2177 break; 2178 2179 memset(&group, 0, sizeof(union amt_addr)); 2180 group.ip6 = grec->grec_mca; 2181 memset(&host, 0, sizeof(union amt_addr)); 2182 host.ip6 = ip6h->saddr; 2183 gnode = amt_lookup_group(tunnel, &group, &host, true); 2184 if (!gnode) { 2185 gnode = amt_add_group(amt, tunnel, &group, &host, 2186 ETH_P_IPV6); 2187 if (IS_ERR(gnode)) 2188 continue; 2189 } 2190 2191 amt_add_srcs(amt, tunnel, gnode, grec, true); 2192 switch (grec->grec_type) { 2193 case MLD2_MODE_IS_INCLUDE: 2194 amt_mcast_is_in_handler(amt, tunnel, gnode, grec, 2195 zero_grec, true); 2196 break; 2197 case MLD2_MODE_IS_EXCLUDE: 2198 amt_mcast_is_ex_handler(amt, tunnel, gnode, grec, 2199 zero_grec, true); 2200 break; 2201 case MLD2_CHANGE_TO_INCLUDE: 2202 amt_mcast_to_in_handler(amt, tunnel, gnode, grec, 2203 zero_grec, true); 2204 break; 2205 case MLD2_CHANGE_TO_EXCLUDE: 2206 amt_mcast_to_ex_handler(amt, tunnel, gnode, grec, 2207 zero_grec, true); 2208 break; 2209 case MLD2_ALLOW_NEW_SOURCES: 2210 amt_mcast_allow_handler(amt, tunnel, gnode, grec, 2211 zero_grec, true); 2212 break; 2213 case MLD2_BLOCK_OLD_SOURCES: 2214 amt_mcast_block_handler(amt, tunnel, gnode, grec, 2215 zero_grec, true); 2216 break; 2217 default: 2218 break; 2219 } 2220 amt_cleanup_srcs(amt, tunnel, gnode); 2221 } 2222 } 2223 2224 /* caller held tunnel->lock */ 2225 static void amt_mld_report_handler(struct amt_dev *amt, struct sk_buff *skb, 2226 struct amt_tunnel_list *tunnel) 2227 { 2228 struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb); 2229 2230 switch (mld->mld_type) { 2231 case ICMPV6_MGM_REPORT: 2232 amt_mldv1_report_handler(amt, skb, tunnel); 2233 break; 2234 case ICMPV6_MLD2_REPORT: 2235 amt_mldv2_report_handler(amt, skb, tunnel); 2236 break; 2237 case ICMPV6_MGM_REDUCTION: 2238 amt_mldv1_leave_handler(amt, skb, tunnel); 2239 break; 2240 default: 2241 break; 2242 } 2243 } 2244 #endif 2245 2246 static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb) 2247 { 2248 struct amt_header_advertisement *amta; 2249 int hdr_size; 2250 2251 hdr_size = sizeof(*amta) + sizeof(struct udphdr); 2252 if (!pskb_may_pull(skb, hdr_size)) 2253 return true; 2254 2255 amta = (struct amt_header_advertisement *)(udp_hdr(skb) + 1); 2256 if (!amta->ip4) 2257 return true; 2258 2259 if (amta->reserved || amta->version) 2260 return true; 2261 2262 if (ipv4_is_loopback(amta->ip4) || ipv4_is_multicast(amta->ip4) || 2263 ipv4_is_zeronet(amta->ip4)) 2264 return true; 2265 2266 if (amt->status != AMT_STATUS_SENT_DISCOVERY || 2267 amt->nonce != amta->nonce) 2268 return true; 2269 2270 amt->remote_ip = amta->ip4; 2271 netdev_dbg(amt->dev, "advertised remote ip = %pI4\n", &amt->remote_ip); 2272 mod_delayed_work(amt_wq, &amt->req_wq, 0); 2273 2274 amt_update_gw_status(amt, AMT_STATUS_RECEIVED_ADVERTISEMENT, true); 2275 return false; 2276 } 2277 2278 static bool amt_multicast_data_handler(struct amt_dev *amt, struct sk_buff *skb) 2279 { 2280 struct amt_header_mcast_data *amtmd; 2281 int hdr_size, len, err; 2282 struct ethhdr *eth; 2283 struct iphdr *iph; 2284 2285 if (READ_ONCE(amt->status) != AMT_STATUS_SENT_UPDATE) 2286 return true; 2287 2288 hdr_size = sizeof(*amtmd) + sizeof(struct udphdr); 2289 if (!pskb_may_pull(skb, hdr_size)) 2290 return true; 2291 2292 amtmd = (struct amt_header_mcast_data *)(udp_hdr(skb) + 1); 2293 if (amtmd->reserved || amtmd->version) 2294 return true; 2295 2296 if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_IP), false)) 2297 return true; 2298 2299 skb_reset_network_header(skb); 2300 skb_push(skb, sizeof(*eth)); 2301 skb_reset_mac_header(skb); 2302 skb_pull(skb, sizeof(*eth)); 2303 eth = eth_hdr(skb); 2304 2305 if (!pskb_may_pull(skb, sizeof(*iph))) 2306 return true; 2307 iph = ip_hdr(skb); 2308 2309 if (iph->version == 4) { 2310 if (!ipv4_is_multicast(iph->daddr)) 2311 return true; 2312 skb->protocol = htons(ETH_P_IP); 2313 eth->h_proto = htons(ETH_P_IP); 2314 ip_eth_mc_map(iph->daddr, eth->h_dest); 2315 #if IS_ENABLED(CONFIG_IPV6) 2316 } else if (iph->version == 6) { 2317 struct ipv6hdr *ip6h; 2318 2319 if (!pskb_may_pull(skb, sizeof(*ip6h))) 2320 return true; 2321 2322 ip6h = ipv6_hdr(skb); 2323 if (!ipv6_addr_is_multicast(&ip6h->daddr)) 2324 return true; 2325 skb->protocol = htons(ETH_P_IPV6); 2326 eth->h_proto = htons(ETH_P_IPV6); 2327 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 2328 #endif 2329 } else { 2330 return true; 2331 } 2332 2333 skb->pkt_type = PACKET_MULTICAST; 2334 skb->ip_summed = CHECKSUM_NONE; 2335 len = skb->len; 2336 err = gro_cells_receive(&amt->gro_cells, skb); 2337 if (likely(err == NET_RX_SUCCESS)) 2338 dev_sw_netstats_rx_add(amt->dev, len); 2339 else 2340 amt->dev->stats.rx_dropped++; 2341 2342 return false; 2343 } 2344 2345 static bool amt_membership_query_handler(struct amt_dev *amt, 2346 struct sk_buff *skb) 2347 { 2348 struct amt_header_membership_query *amtmq; 2349 struct igmpv3_query *ihv3; 2350 struct ethhdr *eth, *oeth; 2351 struct iphdr *iph; 2352 int hdr_size, len; 2353 2354 hdr_size = sizeof(*amtmq) + sizeof(struct udphdr); 2355 if (!pskb_may_pull(skb, hdr_size)) 2356 return true; 2357 2358 amtmq = (struct amt_header_membership_query *)(udp_hdr(skb) + 1); 2359 if (amtmq->reserved || amtmq->version) 2360 return true; 2361 2362 if (amtmq->nonce != amt->nonce) 2363 return true; 2364 2365 hdr_size -= sizeof(*eth); 2366 if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_TEB), false)) 2367 return true; 2368 2369 oeth = eth_hdr(skb); 2370 skb_reset_mac_header(skb); 2371 skb_pull(skb, sizeof(*eth)); 2372 skb_reset_network_header(skb); 2373 eth = eth_hdr(skb); 2374 if (!pskb_may_pull(skb, sizeof(*iph))) 2375 return true; 2376 2377 iph = ip_hdr(skb); 2378 if (iph->version == 4) { 2379 if (READ_ONCE(amt->ready4)) 2380 return true; 2381 2382 if (!pskb_may_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS + 2383 sizeof(*ihv3))) 2384 return true; 2385 2386 if (!ipv4_is_multicast(iph->daddr)) 2387 return true; 2388 2389 ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS); 2390 skb_reset_transport_header(skb); 2391 skb_push(skb, sizeof(*iph) + AMT_IPHDR_OPTS); 2392 WRITE_ONCE(amt->ready4, true); 2393 amt->mac = amtmq->response_mac; 2394 amt->req_cnt = 0; 2395 amt->qi = ihv3->qqic; 2396 skb->protocol = htons(ETH_P_IP); 2397 eth->h_proto = htons(ETH_P_IP); 2398 ip_eth_mc_map(iph->daddr, eth->h_dest); 2399 #if IS_ENABLED(CONFIG_IPV6) 2400 } else if (iph->version == 6) { 2401 struct mld2_query *mld2q; 2402 struct ipv6hdr *ip6h; 2403 2404 if (READ_ONCE(amt->ready6)) 2405 return true; 2406 2407 if (!pskb_may_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS + 2408 sizeof(*mld2q))) 2409 return true; 2410 2411 ip6h = ipv6_hdr(skb); 2412 if (!ipv6_addr_is_multicast(&ip6h->daddr)) 2413 return true; 2414 2415 mld2q = skb_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS); 2416 skb_reset_transport_header(skb); 2417 skb_push(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS); 2418 WRITE_ONCE(amt->ready6, true); 2419 amt->mac = amtmq->response_mac; 2420 amt->req_cnt = 0; 2421 amt->qi = mld2q->mld2q_qqic; 2422 skb->protocol = htons(ETH_P_IPV6); 2423 eth->h_proto = htons(ETH_P_IPV6); 2424 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 2425 #endif 2426 } else { 2427 return true; 2428 } 2429 2430 ether_addr_copy(eth->h_source, oeth->h_source); 2431 skb->pkt_type = PACKET_MULTICAST; 2432 skb->ip_summed = CHECKSUM_NONE; 2433 len = skb->len; 2434 local_bh_disable(); 2435 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2436 amt_update_gw_status(amt, AMT_STATUS_RECEIVED_QUERY, true); 2437 dev_sw_netstats_rx_add(amt->dev, len); 2438 } else { 2439 amt->dev->stats.rx_dropped++; 2440 } 2441 local_bh_enable(); 2442 2443 return false; 2444 } 2445 2446 static bool amt_update_handler(struct amt_dev *amt, struct sk_buff *skb) 2447 { 2448 struct amt_header_membership_update *amtmu; 2449 struct amt_tunnel_list *tunnel; 2450 struct ethhdr *eth; 2451 struct iphdr *iph; 2452 int len, hdr_size; 2453 2454 iph = ip_hdr(skb); 2455 2456 hdr_size = sizeof(*amtmu) + sizeof(struct udphdr); 2457 if (!pskb_may_pull(skb, hdr_size)) 2458 return true; 2459 2460 amtmu = (struct amt_header_membership_update *)(udp_hdr(skb) + 1); 2461 if (amtmu->reserved || amtmu->version) 2462 return true; 2463 2464 if (iptunnel_pull_header(skb, hdr_size, skb->protocol, false)) 2465 return true; 2466 2467 skb_reset_network_header(skb); 2468 2469 list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) { 2470 if (tunnel->ip4 == iph->saddr) { 2471 if ((amtmu->nonce == tunnel->nonce && 2472 amtmu->response_mac == tunnel->mac)) { 2473 mod_delayed_work(amt_wq, &tunnel->gc_wq, 2474 msecs_to_jiffies(amt_gmi(amt)) 2475 * 3); 2476 goto report; 2477 } else { 2478 netdev_dbg(amt->dev, "Invalid MAC\n"); 2479 return true; 2480 } 2481 } 2482 } 2483 2484 return true; 2485 2486 report: 2487 if (!pskb_may_pull(skb, sizeof(*iph))) 2488 return true; 2489 2490 iph = ip_hdr(skb); 2491 if (iph->version == 4) { 2492 if (ip_mc_check_igmp(skb)) { 2493 netdev_dbg(amt->dev, "Invalid IGMP\n"); 2494 return true; 2495 } 2496 2497 spin_lock_bh(&tunnel->lock); 2498 amt_igmp_report_handler(amt, skb, tunnel); 2499 spin_unlock_bh(&tunnel->lock); 2500 2501 skb_push(skb, sizeof(struct ethhdr)); 2502 skb_reset_mac_header(skb); 2503 eth = eth_hdr(skb); 2504 skb->protocol = htons(ETH_P_IP); 2505 eth->h_proto = htons(ETH_P_IP); 2506 ip_eth_mc_map(iph->daddr, eth->h_dest); 2507 #if IS_ENABLED(CONFIG_IPV6) 2508 } else if (iph->version == 6) { 2509 struct ipv6hdr *ip6h = ipv6_hdr(skb); 2510 2511 if (ipv6_mc_check_mld(skb)) { 2512 netdev_dbg(amt->dev, "Invalid MLD\n"); 2513 return true; 2514 } 2515 2516 spin_lock_bh(&tunnel->lock); 2517 amt_mld_report_handler(amt, skb, tunnel); 2518 spin_unlock_bh(&tunnel->lock); 2519 2520 skb_push(skb, sizeof(struct ethhdr)); 2521 skb_reset_mac_header(skb); 2522 eth = eth_hdr(skb); 2523 skb->protocol = htons(ETH_P_IPV6); 2524 eth->h_proto = htons(ETH_P_IPV6); 2525 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); 2526 #endif 2527 } else { 2528 netdev_dbg(amt->dev, "Unsupported Protocol\n"); 2529 return true; 2530 } 2531 2532 skb_pull(skb, sizeof(struct ethhdr)); 2533 skb->pkt_type = PACKET_MULTICAST; 2534 skb->ip_summed = CHECKSUM_NONE; 2535 len = skb->len; 2536 if (__netif_rx(skb) == NET_RX_SUCCESS) { 2537 amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_UPDATE, 2538 true); 2539 dev_sw_netstats_rx_add(amt->dev, len); 2540 } else { 2541 amt->dev->stats.rx_dropped++; 2542 } 2543 2544 return false; 2545 } 2546 2547 static void amt_send_advertisement(struct amt_dev *amt, __be32 nonce, 2548 __be32 daddr, __be16 dport) 2549 { 2550 struct amt_header_advertisement *amta; 2551 int hlen, tlen, offset; 2552 struct socket *sock; 2553 struct udphdr *udph; 2554 struct sk_buff *skb; 2555 struct iphdr *iph; 2556 struct rtable *rt; 2557 struct flowi4 fl4; 2558 u32 len; 2559 int err; 2560 2561 rcu_read_lock(); 2562 sock = rcu_dereference(amt->sock); 2563 if (!sock) 2564 goto out; 2565 2566 if (!netif_running(amt->stream_dev) || !netif_running(amt->dev)) 2567 goto out; 2568 2569 rt = ip_route_output_ports(amt->net, &fl4, sock->sk, 2570 daddr, amt->local_ip, 2571 dport, amt->relay_port, 2572 IPPROTO_UDP, 0, 2573 amt->stream_dev->ifindex); 2574 if (IS_ERR(rt)) { 2575 amt->dev->stats.tx_errors++; 2576 goto out; 2577 } 2578 2579 hlen = LL_RESERVED_SPACE(amt->dev); 2580 tlen = amt->dev->needed_tailroom; 2581 len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amta); 2582 skb = netdev_alloc_skb_ip_align(amt->dev, len); 2583 if (!skb) { 2584 ip_rt_put(rt); 2585 amt->dev->stats.tx_errors++; 2586 goto out; 2587 } 2588 2589 skb->priority = TC_PRIO_CONTROL; 2590 skb_dst_set(skb, &rt->dst); 2591 2592 len = sizeof(*iph) + sizeof(*udph) + sizeof(*amta); 2593 skb_reset_network_header(skb); 2594 skb_put(skb, len); 2595 amta = skb_pull(skb, sizeof(*iph) + sizeof(*udph)); 2596 amta->version = 0; 2597 amta->type = AMT_MSG_ADVERTISEMENT; 2598 amta->reserved = 0; 2599 amta->nonce = nonce; 2600 amta->ip4 = amt->local_ip; 2601 skb_push(skb, sizeof(*udph)); 2602 skb_reset_transport_header(skb); 2603 udph = udp_hdr(skb); 2604 udph->source = amt->relay_port; 2605 udph->dest = dport; 2606 udph->len = htons(sizeof(*amta) + sizeof(*udph)); 2607 udph->check = 0; 2608 offset = skb_transport_offset(skb); 2609 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 2610 udph->check = csum_tcpudp_magic(amt->local_ip, daddr, 2611 sizeof(*udph) + sizeof(*amta), 2612 IPPROTO_UDP, skb->csum); 2613 2614 skb_push(skb, sizeof(*iph)); 2615 iph = ip_hdr(skb); 2616 iph->version = 4; 2617 iph->ihl = (sizeof(struct iphdr)) >> 2; 2618 iph->tos = AMT_TOS; 2619 iph->frag_off = 0; 2620 iph->ttl = ip4_dst_hoplimit(&rt->dst); 2621 iph->daddr = daddr; 2622 iph->saddr = amt->local_ip; 2623 iph->protocol = IPPROTO_UDP; 2624 iph->tot_len = htons(len); 2625 2626 skb->ip_summed = CHECKSUM_NONE; 2627 ip_select_ident(amt->net, skb, NULL); 2628 ip_send_check(iph); 2629 err = ip_local_out(amt->net, sock->sk, skb); 2630 if (unlikely(net_xmit_eval(err))) 2631 amt->dev->stats.tx_errors++; 2632 2633 out: 2634 rcu_read_unlock(); 2635 } 2636 2637 static bool amt_discovery_handler(struct amt_dev *amt, struct sk_buff *skb) 2638 { 2639 struct amt_header_discovery *amtd; 2640 struct udphdr *udph; 2641 struct iphdr *iph; 2642 2643 if (!pskb_may_pull(skb, sizeof(*udph) + sizeof(*amtd))) 2644 return true; 2645 2646 iph = ip_hdr(skb); 2647 udph = udp_hdr(skb); 2648 amtd = (struct amt_header_discovery *)(udp_hdr(skb) + 1); 2649 2650 if (amtd->reserved || amtd->version) 2651 return true; 2652 2653 amt_send_advertisement(amt, amtd->nonce, iph->saddr, udph->source); 2654 2655 return false; 2656 } 2657 2658 static bool amt_request_handler(struct amt_dev *amt, struct sk_buff *skb) 2659 { 2660 struct amt_header_request *amtrh; 2661 struct amt_tunnel_list *tunnel; 2662 unsigned long long key; 2663 struct udphdr *udph; 2664 struct iphdr *iph; 2665 u64 mac; 2666 int i; 2667 2668 if (!pskb_may_pull(skb, sizeof(*udph) + sizeof(*amtrh))) 2669 return true; 2670 2671 iph = ip_hdr(skb); 2672 udph = udp_hdr(skb); 2673 amtrh = (struct amt_header_request *)(udp_hdr(skb) + 1); 2674 2675 if (amtrh->reserved1 || amtrh->reserved2 || amtrh->version) 2676 return true; 2677 2678 list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) 2679 if (tunnel->ip4 == iph->saddr) 2680 goto send; 2681 2682 spin_lock_bh(&amt->lock); 2683 if (amt->nr_tunnels >= amt->max_tunnels) { 2684 spin_unlock_bh(&amt->lock); 2685 icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); 2686 return true; 2687 } 2688 2689 tunnel = kzalloc(sizeof(*tunnel) + 2690 (sizeof(struct hlist_head) * amt->hash_buckets), 2691 GFP_ATOMIC); 2692 if (!tunnel) { 2693 spin_unlock_bh(&amt->lock); 2694 return true; 2695 } 2696 2697 tunnel->source_port = udph->source; 2698 tunnel->ip4 = iph->saddr; 2699 2700 memcpy(&key, &tunnel->key, sizeof(unsigned long long)); 2701 tunnel->amt = amt; 2702 spin_lock_init(&tunnel->lock); 2703 for (i = 0; i < amt->hash_buckets; i++) 2704 INIT_HLIST_HEAD(&tunnel->groups[i]); 2705 2706 INIT_DELAYED_WORK(&tunnel->gc_wq, amt_tunnel_expire); 2707 2708 list_add_tail_rcu(&tunnel->list, &amt->tunnel_list); 2709 tunnel->key = amt->key; 2710 __amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_REQUEST, true); 2711 amt->nr_tunnels++; 2712 mod_delayed_work(amt_wq, &tunnel->gc_wq, 2713 msecs_to_jiffies(amt_gmi(amt))); 2714 spin_unlock_bh(&amt->lock); 2715 2716 send: 2717 tunnel->nonce = amtrh->nonce; 2718 mac = siphash_3u32((__force u32)tunnel->ip4, 2719 (__force u32)tunnel->source_port, 2720 (__force u32)tunnel->nonce, 2721 &tunnel->key); 2722 tunnel->mac = mac >> 16; 2723 2724 if (!netif_running(amt->dev) || !netif_running(amt->stream_dev)) 2725 return true; 2726 2727 if (!amtrh->p) 2728 amt_send_igmp_gq(amt, tunnel); 2729 else 2730 amt_send_mld_gq(amt, tunnel); 2731 2732 return false; 2733 } 2734 2735 static void amt_gw_rcv(struct amt_dev *amt, struct sk_buff *skb) 2736 { 2737 int type = amt_parse_type(skb); 2738 int err = 1; 2739 2740 if (type == -1) 2741 goto drop; 2742 2743 if (amt->mode == AMT_MODE_GATEWAY) { 2744 switch (type) { 2745 case AMT_MSG_ADVERTISEMENT: 2746 err = amt_advertisement_handler(amt, skb); 2747 break; 2748 case AMT_MSG_MEMBERSHIP_QUERY: 2749 err = amt_membership_query_handler(amt, skb); 2750 if (!err) 2751 return; 2752 break; 2753 default: 2754 netdev_dbg(amt->dev, "Invalid type of Gateway\n"); 2755 break; 2756 } 2757 } 2758 drop: 2759 if (err) { 2760 amt->dev->stats.rx_dropped++; 2761 kfree_skb(skb); 2762 } else { 2763 consume_skb(skb); 2764 } 2765 } 2766 2767 static int amt_rcv(struct sock *sk, struct sk_buff *skb) 2768 { 2769 struct amt_dev *amt; 2770 struct iphdr *iph; 2771 int type; 2772 bool err; 2773 2774 rcu_read_lock_bh(); 2775 amt = rcu_dereference_sk_user_data(sk); 2776 if (!amt) { 2777 err = true; 2778 kfree_skb(skb); 2779 goto out; 2780 } 2781 2782 skb->dev = amt->dev; 2783 iph = ip_hdr(skb); 2784 type = amt_parse_type(skb); 2785 if (type == -1) { 2786 err = true; 2787 goto drop; 2788 } 2789 2790 if (amt->mode == AMT_MODE_GATEWAY) { 2791 switch (type) { 2792 case AMT_MSG_ADVERTISEMENT: 2793 if (iph->saddr != amt->discovery_ip) { 2794 netdev_dbg(amt->dev, "Invalid Relay IP\n"); 2795 err = true; 2796 goto drop; 2797 } 2798 if (amt_queue_event(amt, AMT_EVENT_RECEIVE, skb)) { 2799 netdev_dbg(amt->dev, "AMT Event queue full\n"); 2800 err = true; 2801 goto drop; 2802 } 2803 goto out; 2804 case AMT_MSG_MULTICAST_DATA: 2805 if (iph->saddr != amt->remote_ip) { 2806 netdev_dbg(amt->dev, "Invalid Relay IP\n"); 2807 err = true; 2808 goto drop; 2809 } 2810 err = amt_multicast_data_handler(amt, skb); 2811 if (err) 2812 goto drop; 2813 else 2814 goto out; 2815 case AMT_MSG_MEMBERSHIP_QUERY: 2816 if (iph->saddr != amt->remote_ip) { 2817 netdev_dbg(amt->dev, "Invalid Relay IP\n"); 2818 err = true; 2819 goto drop; 2820 } 2821 if (amt_queue_event(amt, AMT_EVENT_RECEIVE, skb)) { 2822 netdev_dbg(amt->dev, "AMT Event queue full\n"); 2823 err = true; 2824 goto drop; 2825 } 2826 goto out; 2827 default: 2828 err = true; 2829 netdev_dbg(amt->dev, "Invalid type of Gateway\n"); 2830 break; 2831 } 2832 } else { 2833 switch (type) { 2834 case AMT_MSG_DISCOVERY: 2835 err = amt_discovery_handler(amt, skb); 2836 break; 2837 case AMT_MSG_REQUEST: 2838 err = amt_request_handler(amt, skb); 2839 break; 2840 case AMT_MSG_MEMBERSHIP_UPDATE: 2841 err = amt_update_handler(amt, skb); 2842 if (err) 2843 goto drop; 2844 else 2845 goto out; 2846 default: 2847 err = true; 2848 netdev_dbg(amt->dev, "Invalid type of relay\n"); 2849 break; 2850 } 2851 } 2852 drop: 2853 if (err) { 2854 amt->dev->stats.rx_dropped++; 2855 kfree_skb(skb); 2856 } else { 2857 consume_skb(skb); 2858 } 2859 out: 2860 rcu_read_unlock_bh(); 2861 return 0; 2862 } 2863 2864 static void amt_event_work(struct work_struct *work) 2865 { 2866 struct amt_dev *amt = container_of(work, struct amt_dev, event_wq); 2867 struct sk_buff *skb; 2868 u8 event; 2869 int i; 2870 2871 for (i = 0; i < AMT_MAX_EVENTS; i++) { 2872 spin_lock_bh(&amt->lock); 2873 if (amt->nr_events == 0) { 2874 spin_unlock_bh(&amt->lock); 2875 return; 2876 } 2877 event = amt->events[amt->event_idx].event; 2878 skb = amt->events[amt->event_idx].skb; 2879 amt->events[amt->event_idx].event = AMT_EVENT_NONE; 2880 amt->events[amt->event_idx].skb = NULL; 2881 amt->nr_events--; 2882 amt->event_idx++; 2883 amt->event_idx %= AMT_MAX_EVENTS; 2884 spin_unlock_bh(&amt->lock); 2885 2886 switch (event) { 2887 case AMT_EVENT_RECEIVE: 2888 amt_gw_rcv(amt, skb); 2889 break; 2890 case AMT_EVENT_SEND_DISCOVERY: 2891 amt_event_send_discovery(amt); 2892 break; 2893 case AMT_EVENT_SEND_REQUEST: 2894 amt_event_send_request(amt); 2895 break; 2896 default: 2897 kfree_skb(skb); 2898 break; 2899 } 2900 } 2901 } 2902 2903 static int amt_err_lookup(struct sock *sk, struct sk_buff *skb) 2904 { 2905 struct amt_dev *amt; 2906 int type; 2907 2908 rcu_read_lock_bh(); 2909 amt = rcu_dereference_sk_user_data(sk); 2910 if (!amt) 2911 goto out; 2912 2913 if (amt->mode != AMT_MODE_GATEWAY) 2914 goto drop; 2915 2916 type = amt_parse_type(skb); 2917 if (type == -1) 2918 goto drop; 2919 2920 netdev_dbg(amt->dev, "Received IGMP Unreachable of %s\n", 2921 type_str[type]); 2922 switch (type) { 2923 case AMT_MSG_DISCOVERY: 2924 break; 2925 case AMT_MSG_REQUEST: 2926 case AMT_MSG_MEMBERSHIP_UPDATE: 2927 if (READ_ONCE(amt->status) >= AMT_STATUS_RECEIVED_ADVERTISEMENT) 2928 mod_delayed_work(amt_wq, &amt->req_wq, 0); 2929 break; 2930 default: 2931 goto drop; 2932 } 2933 out: 2934 rcu_read_unlock_bh(); 2935 return 0; 2936 drop: 2937 rcu_read_unlock_bh(); 2938 amt->dev->stats.rx_dropped++; 2939 return 0; 2940 } 2941 2942 static struct socket *amt_create_sock(struct net *net, __be16 port) 2943 { 2944 struct udp_port_cfg udp_conf; 2945 struct socket *sock; 2946 int err; 2947 2948 memset(&udp_conf, 0, sizeof(udp_conf)); 2949 udp_conf.family = AF_INET; 2950 udp_conf.local_ip.s_addr = htonl(INADDR_ANY); 2951 2952 udp_conf.local_udp_port = port; 2953 2954 err = udp_sock_create(net, &udp_conf, &sock); 2955 if (err < 0) 2956 return ERR_PTR(err); 2957 2958 return sock; 2959 } 2960 2961 static int amt_socket_create(struct amt_dev *amt) 2962 { 2963 struct udp_tunnel_sock_cfg tunnel_cfg; 2964 struct socket *sock; 2965 2966 sock = amt_create_sock(amt->net, amt->relay_port); 2967 if (IS_ERR(sock)) 2968 return PTR_ERR(sock); 2969 2970 /* Mark socket as an encapsulation socket */ 2971 memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); 2972 tunnel_cfg.sk_user_data = amt; 2973 tunnel_cfg.encap_type = 1; 2974 tunnel_cfg.encap_rcv = amt_rcv; 2975 tunnel_cfg.encap_err_lookup = amt_err_lookup; 2976 tunnel_cfg.encap_destroy = NULL; 2977 setup_udp_tunnel_sock(amt->net, sock, &tunnel_cfg); 2978 2979 rcu_assign_pointer(amt->sock, sock); 2980 return 0; 2981 } 2982 2983 static int amt_dev_open(struct net_device *dev) 2984 { 2985 struct amt_dev *amt = netdev_priv(dev); 2986 int err; 2987 2988 amt->ready4 = false; 2989 amt->ready6 = false; 2990 amt->event_idx = 0; 2991 amt->nr_events = 0; 2992 2993 err = amt_socket_create(amt); 2994 if (err) 2995 return err; 2996 2997 amt->req_cnt = 0; 2998 amt->remote_ip = 0; 2999 amt->nonce = 0; 3000 get_random_bytes(&amt->key, sizeof(siphash_key_t)); 3001 3002 amt->status = AMT_STATUS_INIT; 3003 if (amt->mode == AMT_MODE_GATEWAY) { 3004 mod_delayed_work(amt_wq, &amt->discovery_wq, 0); 3005 mod_delayed_work(amt_wq, &amt->req_wq, 0); 3006 } else if (amt->mode == AMT_MODE_RELAY) { 3007 mod_delayed_work(amt_wq, &amt->secret_wq, 3008 msecs_to_jiffies(AMT_SECRET_TIMEOUT)); 3009 } 3010 return err; 3011 } 3012 3013 static int amt_dev_stop(struct net_device *dev) 3014 { 3015 struct amt_dev *amt = netdev_priv(dev); 3016 struct amt_tunnel_list *tunnel, *tmp; 3017 struct socket *sock; 3018 struct sk_buff *skb; 3019 int i; 3020 3021 cancel_delayed_work_sync(&amt->req_wq); 3022 cancel_delayed_work_sync(&amt->discovery_wq); 3023 cancel_delayed_work_sync(&amt->secret_wq); 3024 3025 /* shutdown */ 3026 sock = rtnl_dereference(amt->sock); 3027 RCU_INIT_POINTER(amt->sock, NULL); 3028 synchronize_net(); 3029 if (sock) 3030 udp_tunnel_sock_release(sock); 3031 3032 cancel_work_sync(&amt->event_wq); 3033 for (i = 0; i < AMT_MAX_EVENTS; i++) { 3034 skb = amt->events[i].skb; 3035 kfree_skb(skb); 3036 amt->events[i].event = AMT_EVENT_NONE; 3037 amt->events[i].skb = NULL; 3038 } 3039 3040 amt->ready4 = false; 3041 amt->ready6 = false; 3042 amt->req_cnt = 0; 3043 amt->remote_ip = 0; 3044 3045 list_for_each_entry_safe(tunnel, tmp, &amt->tunnel_list, list) { 3046 list_del_rcu(&tunnel->list); 3047 amt->nr_tunnels--; 3048 cancel_delayed_work_sync(&tunnel->gc_wq); 3049 amt_clear_groups(tunnel); 3050 kfree_rcu(tunnel, rcu); 3051 } 3052 3053 return 0; 3054 } 3055 3056 static const struct device_type amt_type = { 3057 .name = "amt", 3058 }; 3059 3060 static int amt_dev_init(struct net_device *dev) 3061 { 3062 struct amt_dev *amt = netdev_priv(dev); 3063 int err; 3064 3065 amt->dev = dev; 3066 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 3067 if (!dev->tstats) 3068 return -ENOMEM; 3069 3070 err = gro_cells_init(&amt->gro_cells, dev); 3071 if (err) { 3072 free_percpu(dev->tstats); 3073 return err; 3074 } 3075 3076 return 0; 3077 } 3078 3079 static void amt_dev_uninit(struct net_device *dev) 3080 { 3081 struct amt_dev *amt = netdev_priv(dev); 3082 3083 gro_cells_destroy(&amt->gro_cells); 3084 free_percpu(dev->tstats); 3085 } 3086 3087 static const struct net_device_ops amt_netdev_ops = { 3088 .ndo_init = amt_dev_init, 3089 .ndo_uninit = amt_dev_uninit, 3090 .ndo_open = amt_dev_open, 3091 .ndo_stop = amt_dev_stop, 3092 .ndo_start_xmit = amt_dev_xmit, 3093 .ndo_get_stats64 = dev_get_tstats64, 3094 }; 3095 3096 static void amt_link_setup(struct net_device *dev) 3097 { 3098 dev->netdev_ops = &amt_netdev_ops; 3099 dev->needs_free_netdev = true; 3100 SET_NETDEV_DEVTYPE(dev, &amt_type); 3101 dev->min_mtu = ETH_MIN_MTU; 3102 dev->max_mtu = ETH_MAX_MTU; 3103 dev->type = ARPHRD_NONE; 3104 dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; 3105 dev->hard_header_len = 0; 3106 dev->addr_len = 0; 3107 dev->priv_flags |= IFF_NO_QUEUE; 3108 dev->features |= NETIF_F_LLTX; 3109 dev->features |= NETIF_F_GSO_SOFTWARE; 3110 dev->features |= NETIF_F_NETNS_LOCAL; 3111 dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM; 3112 dev->hw_features |= NETIF_F_FRAGLIST | NETIF_F_RXCSUM; 3113 dev->hw_features |= NETIF_F_GSO_SOFTWARE; 3114 eth_hw_addr_random(dev); 3115 eth_zero_addr(dev->broadcast); 3116 ether_setup(dev); 3117 } 3118 3119 static const struct nla_policy amt_policy[IFLA_AMT_MAX + 1] = { 3120 [IFLA_AMT_MODE] = { .type = NLA_U32 }, 3121 [IFLA_AMT_RELAY_PORT] = { .type = NLA_U16 }, 3122 [IFLA_AMT_GATEWAY_PORT] = { .type = NLA_U16 }, 3123 [IFLA_AMT_LINK] = { .type = NLA_U32 }, 3124 [IFLA_AMT_LOCAL_IP] = { .len = sizeof_field(struct iphdr, daddr) }, 3125 [IFLA_AMT_REMOTE_IP] = { .len = sizeof_field(struct iphdr, daddr) }, 3126 [IFLA_AMT_DISCOVERY_IP] = { .len = sizeof_field(struct iphdr, daddr) }, 3127 [IFLA_AMT_MAX_TUNNELS] = { .type = NLA_U32 }, 3128 }; 3129 3130 static int amt_validate(struct nlattr *tb[], struct nlattr *data[], 3131 struct netlink_ext_ack *extack) 3132 { 3133 if (!data) 3134 return -EINVAL; 3135 3136 if (!data[IFLA_AMT_LINK]) { 3137 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LINK], 3138 "Link attribute is required"); 3139 return -EINVAL; 3140 } 3141 3142 if (!data[IFLA_AMT_MODE]) { 3143 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE], 3144 "Mode attribute is required"); 3145 return -EINVAL; 3146 } 3147 3148 if (nla_get_u32(data[IFLA_AMT_MODE]) > AMT_MODE_MAX) { 3149 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE], 3150 "Mode attribute is not valid"); 3151 return -EINVAL; 3152 } 3153 3154 if (!data[IFLA_AMT_LOCAL_IP]) { 3155 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_DISCOVERY_IP], 3156 "Local attribute is required"); 3157 return -EINVAL; 3158 } 3159 3160 if (!data[IFLA_AMT_DISCOVERY_IP] && 3161 nla_get_u32(data[IFLA_AMT_MODE]) == AMT_MODE_GATEWAY) { 3162 NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LOCAL_IP], 3163 "Discovery attribute is required"); 3164 return -EINVAL; 3165 } 3166 3167 return 0; 3168 } 3169 3170 static int amt_newlink(struct net *net, struct net_device *dev, 3171 struct nlattr *tb[], struct nlattr *data[], 3172 struct netlink_ext_ack *extack) 3173 { 3174 struct amt_dev *amt = netdev_priv(dev); 3175 int err = -EINVAL; 3176 3177 amt->net = net; 3178 amt->mode = nla_get_u32(data[IFLA_AMT_MODE]); 3179 3180 if (data[IFLA_AMT_MAX_TUNNELS] && 3181 nla_get_u32(data[IFLA_AMT_MAX_TUNNELS])) 3182 amt->max_tunnels = nla_get_u32(data[IFLA_AMT_MAX_TUNNELS]); 3183 else 3184 amt->max_tunnels = AMT_MAX_TUNNELS; 3185 3186 spin_lock_init(&amt->lock); 3187 amt->max_groups = AMT_MAX_GROUP; 3188 amt->max_sources = AMT_MAX_SOURCE; 3189 amt->hash_buckets = AMT_HSIZE; 3190 amt->nr_tunnels = 0; 3191 get_random_bytes(&amt->hash_seed, sizeof(amt->hash_seed)); 3192 amt->stream_dev = dev_get_by_index(net, 3193 nla_get_u32(data[IFLA_AMT_LINK])); 3194 if (!amt->stream_dev) { 3195 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK], 3196 "Can't find stream device"); 3197 return -ENODEV; 3198 } 3199 3200 if (amt->stream_dev->type != ARPHRD_ETHER) { 3201 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK], 3202 "Invalid stream device type"); 3203 goto err; 3204 } 3205 3206 amt->local_ip = nla_get_in_addr(data[IFLA_AMT_LOCAL_IP]); 3207 if (ipv4_is_loopback(amt->local_ip) || 3208 ipv4_is_zeronet(amt->local_ip) || 3209 ipv4_is_multicast(amt->local_ip)) { 3210 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LOCAL_IP], 3211 "Invalid Local address"); 3212 goto err; 3213 } 3214 3215 if (data[IFLA_AMT_RELAY_PORT]) 3216 amt->relay_port = nla_get_be16(data[IFLA_AMT_RELAY_PORT]); 3217 else 3218 amt->relay_port = htons(IANA_AMT_UDP_PORT); 3219 3220 if (data[IFLA_AMT_GATEWAY_PORT]) 3221 amt->gw_port = nla_get_be16(data[IFLA_AMT_GATEWAY_PORT]); 3222 else 3223 amt->gw_port = htons(IANA_AMT_UDP_PORT); 3224 3225 if (!amt->relay_port) { 3226 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], 3227 "relay port must not be 0"); 3228 goto err; 3229 } 3230 if (amt->mode == AMT_MODE_RELAY) { 3231 amt->qrv = READ_ONCE(amt->net->ipv4.sysctl_igmp_qrv); 3232 amt->qri = 10; 3233 dev->needed_headroom = amt->stream_dev->needed_headroom + 3234 AMT_RELAY_HLEN; 3235 dev->mtu = amt->stream_dev->mtu - AMT_RELAY_HLEN; 3236 dev->max_mtu = dev->mtu; 3237 dev->min_mtu = ETH_MIN_MTU + AMT_RELAY_HLEN; 3238 } else { 3239 if (!data[IFLA_AMT_DISCOVERY_IP]) { 3240 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], 3241 "discovery must be set in gateway mode"); 3242 goto err; 3243 } 3244 if (!amt->gw_port) { 3245 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], 3246 "gateway port must not be 0"); 3247 goto err; 3248 } 3249 amt->remote_ip = 0; 3250 amt->discovery_ip = nla_get_in_addr(data[IFLA_AMT_DISCOVERY_IP]); 3251 if (ipv4_is_loopback(amt->discovery_ip) || 3252 ipv4_is_zeronet(amt->discovery_ip) || 3253 ipv4_is_multicast(amt->discovery_ip)) { 3254 NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], 3255 "discovery must be unicast"); 3256 goto err; 3257 } 3258 3259 dev->needed_headroom = amt->stream_dev->needed_headroom + 3260 AMT_GW_HLEN; 3261 dev->mtu = amt->stream_dev->mtu - AMT_GW_HLEN; 3262 dev->max_mtu = dev->mtu; 3263 dev->min_mtu = ETH_MIN_MTU + AMT_GW_HLEN; 3264 } 3265 amt->qi = AMT_INIT_QUERY_INTERVAL; 3266 3267 err = register_netdevice(dev); 3268 if (err < 0) { 3269 netdev_dbg(dev, "failed to register new netdev %d\n", err); 3270 goto err; 3271 } 3272 3273 err = netdev_upper_dev_link(amt->stream_dev, dev, extack); 3274 if (err < 0) { 3275 unregister_netdevice(dev); 3276 goto err; 3277 } 3278 3279 INIT_DELAYED_WORK(&amt->discovery_wq, amt_discovery_work); 3280 INIT_DELAYED_WORK(&amt->req_wq, amt_req_work); 3281 INIT_DELAYED_WORK(&amt->secret_wq, amt_secret_work); 3282 INIT_WORK(&amt->event_wq, amt_event_work); 3283 INIT_LIST_HEAD(&amt->tunnel_list); 3284 return 0; 3285 err: 3286 dev_put(amt->stream_dev); 3287 return err; 3288 } 3289 3290 static void amt_dellink(struct net_device *dev, struct list_head *head) 3291 { 3292 struct amt_dev *amt = netdev_priv(dev); 3293 3294 unregister_netdevice_queue(dev, head); 3295 netdev_upper_dev_unlink(amt->stream_dev, dev); 3296 dev_put(amt->stream_dev); 3297 } 3298 3299 static size_t amt_get_size(const struct net_device *dev) 3300 { 3301 return nla_total_size(sizeof(__u32)) + /* IFLA_AMT_MODE */ 3302 nla_total_size(sizeof(__u16)) + /* IFLA_AMT_RELAY_PORT */ 3303 nla_total_size(sizeof(__u16)) + /* IFLA_AMT_GATEWAY_PORT */ 3304 nla_total_size(sizeof(__u32)) + /* IFLA_AMT_LINK */ 3305 nla_total_size(sizeof(__u32)) + /* IFLA_MAX_TUNNELS */ 3306 nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_DISCOVERY_IP */ 3307 nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_REMOTE_IP */ 3308 nla_total_size(sizeof(struct iphdr)); /* IFLA_AMT_LOCAL_IP */ 3309 } 3310 3311 static int amt_fill_info(struct sk_buff *skb, const struct net_device *dev) 3312 { 3313 struct amt_dev *amt = netdev_priv(dev); 3314 3315 if (nla_put_u32(skb, IFLA_AMT_MODE, amt->mode)) 3316 goto nla_put_failure; 3317 if (nla_put_be16(skb, IFLA_AMT_RELAY_PORT, amt->relay_port)) 3318 goto nla_put_failure; 3319 if (nla_put_be16(skb, IFLA_AMT_GATEWAY_PORT, amt->gw_port)) 3320 goto nla_put_failure; 3321 if (nla_put_u32(skb, IFLA_AMT_LINK, amt->stream_dev->ifindex)) 3322 goto nla_put_failure; 3323 if (nla_put_in_addr(skb, IFLA_AMT_LOCAL_IP, amt->local_ip)) 3324 goto nla_put_failure; 3325 if (nla_put_in_addr(skb, IFLA_AMT_DISCOVERY_IP, amt->discovery_ip)) 3326 goto nla_put_failure; 3327 if (amt->remote_ip) 3328 if (nla_put_in_addr(skb, IFLA_AMT_REMOTE_IP, amt->remote_ip)) 3329 goto nla_put_failure; 3330 if (nla_put_u32(skb, IFLA_AMT_MAX_TUNNELS, amt->max_tunnels)) 3331 goto nla_put_failure; 3332 3333 return 0; 3334 3335 nla_put_failure: 3336 return -EMSGSIZE; 3337 } 3338 3339 static struct rtnl_link_ops amt_link_ops __read_mostly = { 3340 .kind = "amt", 3341 .maxtype = IFLA_AMT_MAX, 3342 .policy = amt_policy, 3343 .priv_size = sizeof(struct amt_dev), 3344 .setup = amt_link_setup, 3345 .validate = amt_validate, 3346 .newlink = amt_newlink, 3347 .dellink = amt_dellink, 3348 .get_size = amt_get_size, 3349 .fill_info = amt_fill_info, 3350 }; 3351 3352 static struct net_device *amt_lookup_upper_dev(struct net_device *dev) 3353 { 3354 struct net_device *upper_dev; 3355 struct amt_dev *amt; 3356 3357 for_each_netdev(dev_net(dev), upper_dev) { 3358 if (netif_is_amt(upper_dev)) { 3359 amt = netdev_priv(upper_dev); 3360 if (amt->stream_dev == dev) 3361 return upper_dev; 3362 } 3363 } 3364 3365 return NULL; 3366 } 3367 3368 static int amt_device_event(struct notifier_block *unused, 3369 unsigned long event, void *ptr) 3370 { 3371 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3372 struct net_device *upper_dev; 3373 struct amt_dev *amt; 3374 LIST_HEAD(list); 3375 int new_mtu; 3376 3377 upper_dev = amt_lookup_upper_dev(dev); 3378 if (!upper_dev) 3379 return NOTIFY_DONE; 3380 amt = netdev_priv(upper_dev); 3381 3382 switch (event) { 3383 case NETDEV_UNREGISTER: 3384 amt_dellink(amt->dev, &list); 3385 unregister_netdevice_many(&list); 3386 break; 3387 case NETDEV_CHANGEMTU: 3388 if (amt->mode == AMT_MODE_RELAY) 3389 new_mtu = dev->mtu - AMT_RELAY_HLEN; 3390 else 3391 new_mtu = dev->mtu - AMT_GW_HLEN; 3392 3393 dev_set_mtu(amt->dev, new_mtu); 3394 break; 3395 } 3396 3397 return NOTIFY_DONE; 3398 } 3399 3400 static struct notifier_block amt_notifier_block __read_mostly = { 3401 .notifier_call = amt_device_event, 3402 }; 3403 3404 static int __init amt_init(void) 3405 { 3406 int err; 3407 3408 err = register_netdevice_notifier(&amt_notifier_block); 3409 if (err < 0) 3410 goto err; 3411 3412 err = rtnl_link_register(&amt_link_ops); 3413 if (err < 0) 3414 goto unregister_notifier; 3415 3416 amt_wq = alloc_workqueue("amt", WQ_UNBOUND, 0); 3417 if (!amt_wq) { 3418 err = -ENOMEM; 3419 goto rtnl_unregister; 3420 } 3421 3422 spin_lock_init(&source_gc_lock); 3423 spin_lock_bh(&source_gc_lock); 3424 INIT_DELAYED_WORK(&source_gc_wq, amt_source_gc_work); 3425 mod_delayed_work(amt_wq, &source_gc_wq, 3426 msecs_to_jiffies(AMT_GC_INTERVAL)); 3427 spin_unlock_bh(&source_gc_lock); 3428 3429 return 0; 3430 3431 rtnl_unregister: 3432 rtnl_link_unregister(&amt_link_ops); 3433 unregister_notifier: 3434 unregister_netdevice_notifier(&amt_notifier_block); 3435 err: 3436 pr_err("error loading AMT module loaded\n"); 3437 return err; 3438 } 3439 late_initcall(amt_init); 3440 3441 static void __exit amt_fini(void) 3442 { 3443 rtnl_link_unregister(&amt_link_ops); 3444 unregister_netdevice_notifier(&amt_notifier_block); 3445 cancel_delayed_work_sync(&source_gc_wq); 3446 __amt_source_gc_work(); 3447 destroy_workqueue(amt_wq); 3448 } 3449 module_exit(amt_fini); 3450 3451 MODULE_LICENSE("GPL"); 3452 MODULE_AUTHOR("Taehee Yoo <ap420073@gmail.com>"); 3453 MODULE_ALIAS_RTNL_LINK("amt"); 3454