1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) B.A.T.M.A.N. contributors: 3 * 4 * Linus Lüssing 5 */ 6 7 #include "multicast.h" 8 #include "main.h" 9 10 #include <linux/atomic.h> 11 #include <linux/bitops.h> 12 #include <linux/bug.h> 13 #include <linux/byteorder/generic.h> 14 #include <linux/errno.h> 15 #include <linux/etherdevice.h> 16 #include <linux/gfp.h> 17 #include <linux/icmpv6.h> 18 #include <linux/if_bridge.h> 19 #include <linux/if_ether.h> 20 #include <linux/igmp.h> 21 #include <linux/in.h> 22 #include <linux/in6.h> 23 #include <linux/inetdevice.h> 24 #include <linux/ip.h> 25 #include <linux/ipv6.h> 26 #include <linux/jiffies.h> 27 #include <linux/kernel.h> 28 #include <linux/kref.h> 29 #include <linux/list.h> 30 #include <linux/lockdep.h> 31 #include <linux/netdevice.h> 32 #include <linux/netlink.h> 33 #include <linux/printk.h> 34 #include <linux/rculist.h> 35 #include <linux/rcupdate.h> 36 #include <linux/skbuff.h> 37 #include <linux/slab.h> 38 #include <linux/spinlock.h> 39 #include <linux/stddef.h> 40 #include <linux/string.h> 41 #include <linux/types.h> 42 #include <linux/workqueue.h> 43 #include <net/addrconf.h> 44 #include <net/genetlink.h> 45 #include <net/if_inet6.h> 46 #include <net/ip.h> 47 #include <net/ipv6.h> 48 #include <net/netlink.h> 49 #include <net/sock.h> 50 #include <uapi/linux/batadv_packet.h> 51 #include <uapi/linux/batman_adv.h> 52 53 #include "bridge_loop_avoidance.h" 54 #include "hard-interface.h" 55 #include "hash.h" 56 #include "log.h" 57 #include "netlink.h" 58 #include "send.h" 59 #include "soft-interface.h" 60 #include "translation-table.h" 61 #include "tvlv.h" 62 63 static void batadv_mcast_mla_update(struct work_struct *work); 64 65 /** 66 * batadv_mcast_start_timer() - schedule the multicast periodic worker 67 * @bat_priv: the bat priv with all the soft interface information 68 */ 69 static void batadv_mcast_start_timer(struct batadv_priv *bat_priv) 70 { 71 queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work, 72 msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD)); 73 } 74 75 /** 76 * batadv_mcast_get_bridge() - get the bridge on top of the softif if it exists 77 * @soft_iface: netdev struct of the mesh interface 78 * 79 * If the given soft interface has a bridge on top then the refcount 80 * of the according net device is increased. 81 * 82 * Return: NULL if no such bridge exists. Otherwise the net device of the 83 * bridge. 84 */ 85 static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) 86 { 87 struct net_device *upper = soft_iface; 88 89 rcu_read_lock(); 90 do { 91 upper = netdev_master_upper_dev_get_rcu(upper); 92 } while (upper && !(upper->priv_flags & IFF_EBRIDGE)); 93 94 if (upper) 95 dev_hold(upper); 96 rcu_read_unlock(); 97 98 return upper; 99 } 100 101 /** 102 * batadv_mcast_mla_rtr_flags_softif_get_ipv4() - get mcast router flags from 103 * node for IPv4 104 * @dev: the interface to check 105 * 106 * Checks the presence of an IPv4 multicast router on this node. 107 * 108 * Caller needs to hold rcu read lock. 109 * 110 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR4 otherwise. 111 */ 112 static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv4(struct net_device *dev) 113 { 114 struct in_device *in_dev = __in_dev_get_rcu(dev); 115 116 if (in_dev && IN_DEV_MFORWARD(in_dev)) 117 return BATADV_NO_FLAGS; 118 else 119 return BATADV_MCAST_WANT_NO_RTR4; 120 } 121 122 /** 123 * batadv_mcast_mla_rtr_flags_softif_get_ipv6() - get mcast router flags from 124 * node for IPv6 125 * @dev: the interface to check 126 * 127 * Checks the presence of an IPv6 multicast router on this node. 128 * 129 * Caller needs to hold rcu read lock. 130 * 131 * Return: BATADV_NO_FLAGS if present, BATADV_MCAST_WANT_NO_RTR6 otherwise. 132 */ 133 #if IS_ENABLED(CONFIG_IPV6_MROUTE) 134 static u8 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) 135 { 136 struct inet6_dev *in6_dev = __in6_dev_get(dev); 137 138 if (in6_dev && in6_dev->cnf.mc_forwarding) 139 return BATADV_NO_FLAGS; 140 else 141 return BATADV_MCAST_WANT_NO_RTR6; 142 } 143 #else 144 static inline u8 145 batadv_mcast_mla_rtr_flags_softif_get_ipv6(struct net_device *dev) 146 { 147 return BATADV_MCAST_WANT_NO_RTR6; 148 } 149 #endif 150 151 /** 152 * batadv_mcast_mla_rtr_flags_softif_get() - get mcast router flags from node 153 * @bat_priv: the bat priv with all the soft interface information 154 * @bridge: bridge interface on top of the soft_iface if present, 155 * otherwise pass NULL 156 * 157 * Checks the presence of IPv4 and IPv6 multicast routers on this 158 * node. 159 * 160 * Return: 161 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present 162 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present 163 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present 164 * The former two OR'd: no multicast router is present 165 */ 166 static u8 batadv_mcast_mla_rtr_flags_softif_get(struct batadv_priv *bat_priv, 167 struct net_device *bridge) 168 { 169 struct net_device *dev = bridge ? bridge : bat_priv->soft_iface; 170 u8 flags = BATADV_NO_FLAGS; 171 172 rcu_read_lock(); 173 174 flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv4(dev); 175 flags |= batadv_mcast_mla_rtr_flags_softif_get_ipv6(dev); 176 177 rcu_read_unlock(); 178 179 return flags; 180 } 181 182 /** 183 * batadv_mcast_mla_rtr_flags_bridge_get() - get mcast router flags from bridge 184 * @bat_priv: the bat priv with all the soft interface information 185 * @bridge: bridge interface on top of the soft_iface if present, 186 * otherwise pass NULL 187 * 188 * Checks the presence of IPv4 and IPv6 multicast routers behind a bridge. 189 * 190 * Return: 191 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present 192 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present 193 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present 194 * The former two OR'd: no multicast router is present 195 */ 196 #if IS_ENABLED(CONFIG_IPV6) 197 static u8 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv, 198 struct net_device *bridge) 199 { 200 struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); 201 struct net_device *dev = bat_priv->soft_iface; 202 struct br_ip_list *br_ip_entry, *tmp; 203 u8 flags = BATADV_MCAST_WANT_NO_RTR6; 204 int ret; 205 206 if (!bridge) 207 return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; 208 209 /* TODO: ask the bridge if a multicast router is present (the bridge 210 * is capable of performing proper RFC4286 multicast router 211 * discovery) instead of searching for a ff02::2 listener here 212 */ 213 ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); 214 if (ret < 0) 215 return BATADV_NO_FLAGS; 216 217 list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { 218 /* the bridge snooping does not maintain IPv4 link-local 219 * addresses - therefore we won't find any IPv4 multicast router 220 * address here, only IPv6 ones 221 */ 222 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6) && 223 ipv6_addr_is_ll_all_routers(&br_ip_entry->addr.dst.ip6)) 224 flags &= ~BATADV_MCAST_WANT_NO_RTR6; 225 226 list_del(&br_ip_entry->list); 227 kfree(br_ip_entry); 228 } 229 230 return flags; 231 } 232 #else 233 static inline u8 234 batadv_mcast_mla_rtr_flags_bridge_get(struct batadv_priv *bat_priv, 235 struct net_device *bridge) 236 { 237 if (bridge) 238 return BATADV_NO_FLAGS; 239 else 240 return BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; 241 } 242 #endif 243 244 /** 245 * batadv_mcast_mla_rtr_flags_get() - get multicast router flags 246 * @bat_priv: the bat priv with all the soft interface information 247 * @bridge: bridge interface on top of the soft_iface if present, 248 * otherwise pass NULL 249 * 250 * Checks the presence of IPv4 and IPv6 multicast routers on this 251 * node or behind its bridge. 252 * 253 * Return: 254 * BATADV_NO_FLAGS: Both an IPv4 and IPv6 multicast router is present 255 * BATADV_MCAST_WANT_NO_RTR4: No IPv4 multicast router is present 256 * BATADV_MCAST_WANT_NO_RTR6: No IPv6 multicast router is present 257 * The former two OR'd: no multicast router is present 258 */ 259 static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv, 260 struct net_device *bridge) 261 { 262 u8 flags = BATADV_MCAST_WANT_NO_RTR4 | BATADV_MCAST_WANT_NO_RTR6; 263 264 flags &= batadv_mcast_mla_rtr_flags_softif_get(bat_priv, bridge); 265 flags &= batadv_mcast_mla_rtr_flags_bridge_get(bat_priv, bridge); 266 267 return flags; 268 } 269 270 /** 271 * batadv_mcast_mla_flags_get() - get the new multicast flags 272 * @bat_priv: the bat priv with all the soft interface information 273 * 274 * Return: A set of flags for the current/next TVLV, querier and 275 * bridge state. 276 */ 277 static struct batadv_mcast_mla_flags 278 batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv) 279 { 280 struct net_device *dev = bat_priv->soft_iface; 281 struct batadv_mcast_querier_state *qr4, *qr6; 282 struct batadv_mcast_mla_flags mla_flags; 283 struct net_device *bridge; 284 285 bridge = batadv_mcast_get_bridge(dev); 286 287 memset(&mla_flags, 0, sizeof(mla_flags)); 288 mla_flags.enabled = 1; 289 mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv, 290 bridge); 291 292 if (!bridge) 293 return mla_flags; 294 295 dev_put(bridge); 296 297 mla_flags.bridged = 1; 298 qr4 = &mla_flags.querier_ipv4; 299 qr6 = &mla_flags.querier_ipv6; 300 301 if (!IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)) 302 pr_warn_once("No bridge IGMP snooping compiled - multicast optimizations disabled\n"); 303 304 qr4->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IP); 305 qr4->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IP); 306 307 qr6->exists = br_multicast_has_querier_anywhere(dev, ETH_P_IPV6); 308 qr6->shadowing = br_multicast_has_querier_adjacent(dev, ETH_P_IPV6); 309 310 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_UNSNOOPABLES; 311 312 /* 1) If no querier exists at all, then multicast listeners on 313 * our local TT clients behind the bridge will keep silent. 314 * 2) If the selected querier is on one of our local TT clients, 315 * behind the bridge, then this querier might shadow multicast 316 * listeners on our local TT clients, behind this bridge. 317 * 318 * In both cases, we will signalize other batman nodes that 319 * we need all multicast traffic of the according protocol. 320 */ 321 if (!qr4->exists || qr4->shadowing) { 322 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV4; 323 mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR4; 324 } 325 326 if (!qr6->exists || qr6->shadowing) { 327 mla_flags.tvlv_flags |= BATADV_MCAST_WANT_ALL_IPV6; 328 mla_flags.tvlv_flags &= ~BATADV_MCAST_WANT_NO_RTR6; 329 } 330 331 return mla_flags; 332 } 333 334 /** 335 * batadv_mcast_mla_is_duplicate() - check whether an address is in a list 336 * @mcast_addr: the multicast address to check 337 * @mcast_list: the list with multicast addresses to search in 338 * 339 * Return: true if the given address is already in the given list. 340 * Otherwise returns false. 341 */ 342 static bool batadv_mcast_mla_is_duplicate(u8 *mcast_addr, 343 struct hlist_head *mcast_list) 344 { 345 struct batadv_hw_addr *mcast_entry; 346 347 hlist_for_each_entry(mcast_entry, mcast_list, list) 348 if (batadv_compare_eth(mcast_entry->addr, mcast_addr)) 349 return true; 350 351 return false; 352 } 353 354 /** 355 * batadv_mcast_mla_softif_get_ipv4() - get softif IPv4 multicast listeners 356 * @dev: the device to collect multicast addresses from 357 * @mcast_list: a list to put found addresses into 358 * @flags: flags indicating the new multicast state 359 * 360 * Collects multicast addresses of IPv4 multicast listeners residing 361 * on this kernel on the given soft interface, dev, in 362 * the given mcast_list. In general, multicast listeners provided by 363 * your multicast receiving applications run directly on this node. 364 * 365 * Return: -ENOMEM on memory allocation error or the number of 366 * items added to the mcast_list otherwise. 367 */ 368 static int 369 batadv_mcast_mla_softif_get_ipv4(struct net_device *dev, 370 struct hlist_head *mcast_list, 371 struct batadv_mcast_mla_flags *flags) 372 { 373 struct batadv_hw_addr *new; 374 struct in_device *in_dev; 375 u8 mcast_addr[ETH_ALEN]; 376 struct ip_mc_list *pmc; 377 int ret = 0; 378 379 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) 380 return 0; 381 382 rcu_read_lock(); 383 384 in_dev = __in_dev_get_rcu(dev); 385 if (!in_dev) { 386 rcu_read_unlock(); 387 return 0; 388 } 389 390 for (pmc = rcu_dereference(in_dev->mc_list); pmc; 391 pmc = rcu_dereference(pmc->next_rcu)) { 392 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && 393 ipv4_is_local_multicast(pmc->multiaddr)) 394 continue; 395 396 if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && 397 !ipv4_is_local_multicast(pmc->multiaddr)) 398 continue; 399 400 ip_eth_mc_map(pmc->multiaddr, mcast_addr); 401 402 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) 403 continue; 404 405 new = kmalloc(sizeof(*new), GFP_ATOMIC); 406 if (!new) { 407 ret = -ENOMEM; 408 break; 409 } 410 411 ether_addr_copy(new->addr, mcast_addr); 412 hlist_add_head(&new->list, mcast_list); 413 ret++; 414 } 415 rcu_read_unlock(); 416 417 return ret; 418 } 419 420 /** 421 * batadv_mcast_mla_softif_get_ipv6() - get softif IPv6 multicast listeners 422 * @dev: the device to collect multicast addresses from 423 * @mcast_list: a list to put found addresses into 424 * @flags: flags indicating the new multicast state 425 * 426 * Collects multicast addresses of IPv6 multicast listeners residing 427 * on this kernel on the given soft interface, dev, in 428 * the given mcast_list. In general, multicast listeners provided by 429 * your multicast receiving applications run directly on this node. 430 * 431 * Return: -ENOMEM on memory allocation error or the number of 432 * items added to the mcast_list otherwise. 433 */ 434 #if IS_ENABLED(CONFIG_IPV6) 435 static int 436 batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, 437 struct hlist_head *mcast_list, 438 struct batadv_mcast_mla_flags *flags) 439 { 440 struct batadv_hw_addr *new; 441 struct inet6_dev *in6_dev; 442 u8 mcast_addr[ETH_ALEN]; 443 struct ifmcaddr6 *pmc6; 444 int ret = 0; 445 446 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) 447 return 0; 448 449 rcu_read_lock(); 450 451 in6_dev = __in6_dev_get(dev); 452 if (!in6_dev) { 453 rcu_read_unlock(); 454 return 0; 455 } 456 457 for (pmc6 = rcu_dereference(in6_dev->mc_list); 458 pmc6; 459 pmc6 = rcu_dereference(pmc6->next)) { 460 if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) < 461 IPV6_ADDR_SCOPE_LINKLOCAL) 462 continue; 463 464 if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && 465 ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr)) 466 continue; 467 468 if (!(flags->tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && 469 IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) > 470 IPV6_ADDR_SCOPE_LINKLOCAL) 471 continue; 472 473 ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr); 474 475 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) 476 continue; 477 478 new = kmalloc(sizeof(*new), GFP_ATOMIC); 479 if (!new) { 480 ret = -ENOMEM; 481 break; 482 } 483 484 ether_addr_copy(new->addr, mcast_addr); 485 hlist_add_head(&new->list, mcast_list); 486 ret++; 487 } 488 rcu_read_unlock(); 489 490 return ret; 491 } 492 #else 493 static inline int 494 batadv_mcast_mla_softif_get_ipv6(struct net_device *dev, 495 struct hlist_head *mcast_list, 496 struct batadv_mcast_mla_flags *flags) 497 { 498 return 0; 499 } 500 #endif 501 502 /** 503 * batadv_mcast_mla_softif_get() - get softif multicast listeners 504 * @dev: the device to collect multicast addresses from 505 * @mcast_list: a list to put found addresses into 506 * @flags: flags indicating the new multicast state 507 * 508 * Collects multicast addresses of multicast listeners residing 509 * on this kernel on the given soft interface, dev, in 510 * the given mcast_list. In general, multicast listeners provided by 511 * your multicast receiving applications run directly on this node. 512 * 513 * If there is a bridge interface on top of dev, collect from that one 514 * instead. Just like with IP addresses and routes, multicast listeners 515 * will(/should) register to the bridge interface instead of an 516 * enslaved bat0. 517 * 518 * Return: -ENOMEM on memory allocation error or the number of 519 * items added to the mcast_list otherwise. 520 */ 521 static int 522 batadv_mcast_mla_softif_get(struct net_device *dev, 523 struct hlist_head *mcast_list, 524 struct batadv_mcast_mla_flags *flags) 525 { 526 struct net_device *bridge = batadv_mcast_get_bridge(dev); 527 int ret4, ret6 = 0; 528 529 if (bridge) 530 dev = bridge; 531 532 ret4 = batadv_mcast_mla_softif_get_ipv4(dev, mcast_list, flags); 533 if (ret4 < 0) 534 goto out; 535 536 ret6 = batadv_mcast_mla_softif_get_ipv6(dev, mcast_list, flags); 537 if (ret6 < 0) { 538 ret4 = 0; 539 goto out; 540 } 541 542 out: 543 if (bridge) 544 dev_put(bridge); 545 546 return ret4 + ret6; 547 } 548 549 /** 550 * batadv_mcast_mla_br_addr_cpy() - copy a bridge multicast address 551 * @dst: destination to write to - a multicast MAC address 552 * @src: source to read from - a multicast IP address 553 * 554 * Converts a given multicast IPv4/IPv6 address from a bridge 555 * to its matching multicast MAC address and copies it into the given 556 * destination buffer. 557 * 558 * Caller needs to make sure the destination buffer can hold 559 * at least ETH_ALEN bytes. 560 */ 561 static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) 562 { 563 if (src->proto == htons(ETH_P_IP)) 564 ip_eth_mc_map(src->dst.ip4, dst); 565 #if IS_ENABLED(CONFIG_IPV6) 566 else if (src->proto == htons(ETH_P_IPV6)) 567 ipv6_eth_mc_map(&src->dst.ip6, dst); 568 #endif 569 else 570 eth_zero_addr(dst); 571 } 572 573 /** 574 * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners 575 * @dev: a bridge slave whose bridge to collect multicast addresses from 576 * @mcast_list: a list to put found addresses into 577 * @flags: flags indicating the new multicast state 578 * 579 * Collects multicast addresses of multicast listeners residing 580 * on foreign, non-mesh devices which we gave access to our mesh via 581 * a bridge on top of the given soft interface, dev, in the given 582 * mcast_list. 583 * 584 * Return: -ENOMEM on memory allocation error or the number of 585 * items added to the mcast_list otherwise. 586 */ 587 static int batadv_mcast_mla_bridge_get(struct net_device *dev, 588 struct hlist_head *mcast_list, 589 struct batadv_mcast_mla_flags *flags) 590 { 591 struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); 592 struct br_ip_list *br_ip_entry, *tmp; 593 u8 tvlv_flags = flags->tvlv_flags; 594 struct batadv_hw_addr *new; 595 u8 mcast_addr[ETH_ALEN]; 596 int ret; 597 598 /* we don't need to detect these devices/listeners, the IGMP/MLD 599 * snooping code of the Linux bridge already does that for us 600 */ 601 ret = br_multicast_list_adjacent(dev, &bridge_mcast_list); 602 if (ret < 0) 603 goto out; 604 605 list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { 606 if (br_ip_entry->addr.proto == htons(ETH_P_IP)) { 607 if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4) 608 continue; 609 610 if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && 611 ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4)) 612 continue; 613 614 if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR4) && 615 !ipv4_is_local_multicast(br_ip_entry->addr.dst.ip4)) 616 continue; 617 } 618 619 #if IS_ENABLED(CONFIG_IPV6) 620 if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) { 621 if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6) 622 continue; 623 624 if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && 625 ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.dst.ip6)) 626 continue; 627 628 if (!(tvlv_flags & BATADV_MCAST_WANT_NO_RTR6) && 629 IPV6_ADDR_MC_SCOPE(&br_ip_entry->addr.dst.ip6) > 630 IPV6_ADDR_SCOPE_LINKLOCAL) 631 continue; 632 } 633 #endif 634 635 batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); 636 if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) 637 continue; 638 639 new = kmalloc(sizeof(*new), GFP_ATOMIC); 640 if (!new) { 641 ret = -ENOMEM; 642 break; 643 } 644 645 ether_addr_copy(new->addr, mcast_addr); 646 hlist_add_head(&new->list, mcast_list); 647 } 648 649 out: 650 list_for_each_entry_safe(br_ip_entry, tmp, &bridge_mcast_list, list) { 651 list_del(&br_ip_entry->list); 652 kfree(br_ip_entry); 653 } 654 655 return ret; 656 } 657 658 /** 659 * batadv_mcast_mla_list_free() - free a list of multicast addresses 660 * @mcast_list: the list to free 661 * 662 * Removes and frees all items in the given mcast_list. 663 */ 664 static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list) 665 { 666 struct batadv_hw_addr *mcast_entry; 667 struct hlist_node *tmp; 668 669 hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { 670 hlist_del(&mcast_entry->list); 671 kfree(mcast_entry); 672 } 673 } 674 675 /** 676 * batadv_mcast_mla_tt_retract() - clean up multicast listener announcements 677 * @bat_priv: the bat priv with all the soft interface information 678 * @mcast_list: a list of addresses which should _not_ be removed 679 * 680 * Retracts the announcement of any multicast listener from the 681 * translation table except the ones listed in the given mcast_list. 682 * 683 * If mcast_list is NULL then all are retracted. 684 */ 685 static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv, 686 struct hlist_head *mcast_list) 687 { 688 struct batadv_hw_addr *mcast_entry; 689 struct hlist_node *tmp; 690 691 hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list, 692 list) { 693 if (mcast_list && 694 batadv_mcast_mla_is_duplicate(mcast_entry->addr, 695 mcast_list)) 696 continue; 697 698 batadv_tt_local_remove(bat_priv, mcast_entry->addr, 699 BATADV_NO_FLAGS, 700 "mcast TT outdated", false); 701 702 hlist_del(&mcast_entry->list); 703 kfree(mcast_entry); 704 } 705 } 706 707 /** 708 * batadv_mcast_mla_tt_add() - add multicast listener announcements 709 * @bat_priv: the bat priv with all the soft interface information 710 * @mcast_list: a list of addresses which are going to get added 711 * 712 * Adds multicast listener announcements from the given mcast_list to the 713 * translation table if they have not been added yet. 714 */ 715 static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv, 716 struct hlist_head *mcast_list) 717 { 718 struct batadv_hw_addr *mcast_entry; 719 struct hlist_node *tmp; 720 721 if (!mcast_list) 722 return; 723 724 hlist_for_each_entry_safe(mcast_entry, tmp, mcast_list, list) { 725 if (batadv_mcast_mla_is_duplicate(mcast_entry->addr, 726 &bat_priv->mcast.mla_list)) 727 continue; 728 729 if (!batadv_tt_local_add(bat_priv->soft_iface, 730 mcast_entry->addr, BATADV_NO_FLAGS, 731 BATADV_NULL_IFINDEX, BATADV_NO_MARK)) 732 continue; 733 734 hlist_del(&mcast_entry->list); 735 hlist_add_head(&mcast_entry->list, &bat_priv->mcast.mla_list); 736 } 737 } 738 739 /** 740 * batadv_mcast_querier_log() - debug output regarding the querier status on 741 * link 742 * @bat_priv: the bat priv with all the soft interface information 743 * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD") 744 * @old_state: the previous querier state on our link 745 * @new_state: the new querier state on our link 746 * 747 * Outputs debug messages to the logging facility with log level 'mcast' 748 * regarding changes to the querier status on the link which are relevant 749 * to our multicast optimizations. 750 * 751 * Usually this is about whether a querier appeared or vanished in 752 * our mesh or whether the querier is in the suboptimal position of being 753 * behind our local bridge segment: Snooping switches will directly 754 * forward listener reports to the querier, therefore batman-adv and 755 * the bridge will potentially not see these listeners - the querier is 756 * potentially shadowing listeners from us then. 757 * 758 * This is only interesting for nodes with a bridge on top of their 759 * soft interface. 760 */ 761 static void 762 batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto, 763 struct batadv_mcast_querier_state *old_state, 764 struct batadv_mcast_querier_state *new_state) 765 { 766 if (!old_state->exists && new_state->exists) 767 batadv_info(bat_priv->soft_iface, "%s Querier appeared\n", 768 str_proto); 769 else if (old_state->exists && !new_state->exists) 770 batadv_info(bat_priv->soft_iface, 771 "%s Querier disappeared - multicast optimizations disabled\n", 772 str_proto); 773 else if (!bat_priv->mcast.mla_flags.bridged && !new_state->exists) 774 batadv_info(bat_priv->soft_iface, 775 "No %s Querier present - multicast optimizations disabled\n", 776 str_proto); 777 778 if (new_state->exists) { 779 if ((!old_state->shadowing && new_state->shadowing) || 780 (!old_state->exists && new_state->shadowing)) 781 batadv_dbg(BATADV_DBG_MCAST, bat_priv, 782 "%s Querier is behind our bridged segment: Might shadow listeners\n", 783 str_proto); 784 else if (old_state->shadowing && !new_state->shadowing) 785 batadv_dbg(BATADV_DBG_MCAST, bat_priv, 786 "%s Querier is not behind our bridged segment\n", 787 str_proto); 788 } 789 } 790 791 /** 792 * batadv_mcast_bridge_log() - debug output for topology changes in bridged 793 * setups 794 * @bat_priv: the bat priv with all the soft interface information 795 * @new_flags: flags indicating the new multicast state 796 * 797 * If no bridges are ever used on this node, then this function does nothing. 798 * 799 * Otherwise this function outputs debug information to the 'mcast' log level 800 * which might be relevant to our multicast optimizations. 801 * 802 * More precisely, it outputs information when a bridge interface is added or 803 * removed from a soft interface. And when a bridge is present, it further 804 * outputs information about the querier state which is relevant for the 805 * multicast flags this node is going to set. 806 */ 807 static void 808 batadv_mcast_bridge_log(struct batadv_priv *bat_priv, 809 struct batadv_mcast_mla_flags *new_flags) 810 { 811 struct batadv_mcast_mla_flags *old_flags = &bat_priv->mcast.mla_flags; 812 813 if (!old_flags->bridged && new_flags->bridged) 814 batadv_dbg(BATADV_DBG_MCAST, bat_priv, 815 "Bridge added: Setting Unsnoopables(U)-flag\n"); 816 else if (old_flags->bridged && !new_flags->bridged) 817 batadv_dbg(BATADV_DBG_MCAST, bat_priv, 818 "Bridge removed: Unsetting Unsnoopables(U)-flag\n"); 819 820 if (new_flags->bridged) { 821 batadv_mcast_querier_log(bat_priv, "IGMP", 822 &old_flags->querier_ipv4, 823 &new_flags->querier_ipv4); 824 batadv_mcast_querier_log(bat_priv, "MLD", 825 &old_flags->querier_ipv6, 826 &new_flags->querier_ipv6); 827 } 828 } 829 830 /** 831 * batadv_mcast_flags_log() - output debug information about mcast flag changes 832 * @bat_priv: the bat priv with all the soft interface information 833 * @flags: TVLV flags indicating the new multicast state 834 * 835 * Whenever the multicast TVLV flags this node announces change, this function 836 * should be used to notify userspace about the change. 837 */ 838 static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags) 839 { 840 bool old_enabled = bat_priv->mcast.mla_flags.enabled; 841 u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags; 842 char str_old_flags[] = "[.... . ]"; 843 844 sprintf(str_old_flags, "[%c%c%c%s%s]", 845 (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', 846 (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', 847 (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', 848 !(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", 849 !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); 850 851 batadv_dbg(BATADV_DBG_MCAST, bat_priv, 852 "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n", 853 old_enabled ? str_old_flags : "<undefined>", 854 (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.', 855 (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.', 856 (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.', 857 !(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ", 858 !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". "); 859 } 860 861 /** 862 * batadv_mcast_mla_flags_update() - update multicast flags 863 * @bat_priv: the bat priv with all the soft interface information 864 * @flags: flags indicating the new multicast state 865 * 866 * Updates the own multicast tvlv with our current multicast related settings, 867 * capabilities and inabilities. 868 */ 869 static void 870 batadv_mcast_mla_flags_update(struct batadv_priv *bat_priv, 871 struct batadv_mcast_mla_flags *flags) 872 { 873 struct batadv_tvlv_mcast_data mcast_data; 874 875 if (!memcmp(flags, &bat_priv->mcast.mla_flags, sizeof(*flags))) 876 return; 877 878 batadv_mcast_bridge_log(bat_priv, flags); 879 batadv_mcast_flags_log(bat_priv, flags->tvlv_flags); 880 881 mcast_data.flags = flags->tvlv_flags; 882 memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved)); 883 884 batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2, 885 &mcast_data, sizeof(mcast_data)); 886 887 bat_priv->mcast.mla_flags = *flags; 888 } 889 890 /** 891 * __batadv_mcast_mla_update() - update the own MLAs 892 * @bat_priv: the bat priv with all the soft interface information 893 * 894 * Updates the own multicast listener announcements in the translation 895 * table as well as the own, announced multicast tvlv container. 896 * 897 * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list 898 * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are 899 * ensured by the non-parallel execution of the worker this function 900 * belongs to. 901 */ 902 static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) 903 { 904 struct net_device *soft_iface = bat_priv->soft_iface; 905 struct hlist_head mcast_list = HLIST_HEAD_INIT; 906 struct batadv_mcast_mla_flags flags; 907 int ret; 908 909 flags = batadv_mcast_mla_flags_get(bat_priv); 910 911 ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list, &flags); 912 if (ret < 0) 913 goto out; 914 915 ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list, &flags); 916 if (ret < 0) 917 goto out; 918 919 spin_lock(&bat_priv->mcast.mla_lock); 920 batadv_mcast_mla_tt_retract(bat_priv, &mcast_list); 921 batadv_mcast_mla_tt_add(bat_priv, &mcast_list); 922 batadv_mcast_mla_flags_update(bat_priv, &flags); 923 spin_unlock(&bat_priv->mcast.mla_lock); 924 925 out: 926 batadv_mcast_mla_list_free(&mcast_list); 927 } 928 929 /** 930 * batadv_mcast_mla_update() - update the own MLAs 931 * @work: kernel work struct 932 * 933 * Updates the own multicast listener announcements in the translation 934 * table as well as the own, announced multicast tvlv container. 935 * 936 * In the end, reschedules the work timer. 937 */ 938 static void batadv_mcast_mla_update(struct work_struct *work) 939 { 940 struct delayed_work *delayed_work; 941 struct batadv_priv_mcast *priv_mcast; 942 struct batadv_priv *bat_priv; 943 944 delayed_work = to_delayed_work(work); 945 priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work); 946 bat_priv = container_of(priv_mcast, struct batadv_priv, mcast); 947 948 __batadv_mcast_mla_update(bat_priv); 949 batadv_mcast_start_timer(bat_priv); 950 } 951 952 /** 953 * batadv_mcast_is_report_ipv4() - check for IGMP reports 954 * @skb: the ethernet frame destined for the mesh 955 * 956 * This call might reallocate skb data. 957 * 958 * Checks whether the given frame is a valid IGMP report. 959 * 960 * Return: If so then true, otherwise false. 961 */ 962 static bool batadv_mcast_is_report_ipv4(struct sk_buff *skb) 963 { 964 if (ip_mc_check_igmp(skb) < 0) 965 return false; 966 967 switch (igmp_hdr(skb)->type) { 968 case IGMP_HOST_MEMBERSHIP_REPORT: 969 case IGMPV2_HOST_MEMBERSHIP_REPORT: 970 case IGMPV3_HOST_MEMBERSHIP_REPORT: 971 return true; 972 } 973 974 return false; 975 } 976 977 /** 978 * batadv_mcast_forw_mode_check_ipv4() - check for optimized forwarding 979 * potential 980 * @bat_priv: the bat priv with all the soft interface information 981 * @skb: the IPv4 packet to check 982 * @is_unsnoopable: stores whether the destination is snoopable 983 * @is_routable: stores whether the destination is routable 984 * 985 * Checks whether the given IPv4 packet has the potential to be forwarded with a 986 * mode more optimal than classic flooding. 987 * 988 * Return: If so then 0. Otherwise -EINVAL or -ENOMEM in case of memory 989 * allocation failure. 990 */ 991 static int batadv_mcast_forw_mode_check_ipv4(struct batadv_priv *bat_priv, 992 struct sk_buff *skb, 993 bool *is_unsnoopable, 994 int *is_routable) 995 { 996 struct iphdr *iphdr; 997 998 /* We might fail due to out-of-memory -> drop it */ 999 if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*iphdr))) 1000 return -ENOMEM; 1001 1002 if (batadv_mcast_is_report_ipv4(skb)) 1003 return -EINVAL; 1004 1005 iphdr = ip_hdr(skb); 1006 1007 /* link-local multicast listeners behind a bridge are 1008 * not snoopable (see RFC4541, section 2.1.2.2) 1009 */ 1010 if (ipv4_is_local_multicast(iphdr->daddr)) 1011 *is_unsnoopable = true; 1012 else 1013 *is_routable = ETH_P_IP; 1014 1015 return 0; 1016 } 1017 1018 /** 1019 * batadv_mcast_is_report_ipv6() - check for MLD reports 1020 * @skb: the ethernet frame destined for the mesh 1021 * 1022 * This call might reallocate skb data. 1023 * 1024 * Checks whether the given frame is a valid MLD report. 1025 * 1026 * Return: If so then true, otherwise false. 1027 */ 1028 static bool batadv_mcast_is_report_ipv6(struct sk_buff *skb) 1029 { 1030 if (ipv6_mc_check_mld(skb) < 0) 1031 return false; 1032 1033 switch (icmp6_hdr(skb)->icmp6_type) { 1034 case ICMPV6_MGM_REPORT: 1035 case ICMPV6_MLD2_REPORT: 1036 return true; 1037 } 1038 1039 return false; 1040 } 1041 1042 /** 1043 * batadv_mcast_forw_mode_check_ipv6() - check for optimized forwarding 1044 * potential 1045 * @bat_priv: the bat priv with all the soft interface information 1046 * @skb: the IPv6 packet to check 1047 * @is_unsnoopable: stores whether the destination is snoopable 1048 * @is_routable: stores whether the destination is routable 1049 * 1050 * Checks whether the given IPv6 packet has the potential to be forwarded with a 1051 * mode more optimal than classic flooding. 1052 * 1053 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory 1054 */ 1055 static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv, 1056 struct sk_buff *skb, 1057 bool *is_unsnoopable, 1058 int *is_routable) 1059 { 1060 struct ipv6hdr *ip6hdr; 1061 1062 /* We might fail due to out-of-memory -> drop it */ 1063 if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr))) 1064 return -ENOMEM; 1065 1066 if (batadv_mcast_is_report_ipv6(skb)) 1067 return -EINVAL; 1068 1069 ip6hdr = ipv6_hdr(skb); 1070 1071 if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) < IPV6_ADDR_SCOPE_LINKLOCAL) 1072 return -EINVAL; 1073 1074 /* link-local-all-nodes multicast listeners behind a bridge are 1075 * not snoopable (see RFC4541, section 3, paragraph 3) 1076 */ 1077 if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr)) 1078 *is_unsnoopable = true; 1079 else if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) > IPV6_ADDR_SCOPE_LINKLOCAL) 1080 *is_routable = ETH_P_IPV6; 1081 1082 return 0; 1083 } 1084 1085 /** 1086 * batadv_mcast_forw_mode_check() - check for optimized forwarding potential 1087 * @bat_priv: the bat priv with all the soft interface information 1088 * @skb: the multicast frame to check 1089 * @is_unsnoopable: stores whether the destination is snoopable 1090 * @is_routable: stores whether the destination is routable 1091 * 1092 * Checks whether the given multicast ethernet frame has the potential to be 1093 * forwarded with a mode more optimal than classic flooding. 1094 * 1095 * Return: If so then 0. Otherwise -EINVAL is or -ENOMEM if we are out of memory 1096 */ 1097 static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv, 1098 struct sk_buff *skb, 1099 bool *is_unsnoopable, 1100 int *is_routable) 1101 { 1102 struct ethhdr *ethhdr = eth_hdr(skb); 1103 1104 if (!atomic_read(&bat_priv->multicast_mode)) 1105 return -EINVAL; 1106 1107 switch (ntohs(ethhdr->h_proto)) { 1108 case ETH_P_IP: 1109 return batadv_mcast_forw_mode_check_ipv4(bat_priv, skb, 1110 is_unsnoopable, 1111 is_routable); 1112 case ETH_P_IPV6: 1113 if (!IS_ENABLED(CONFIG_IPV6)) 1114 return -EINVAL; 1115 1116 return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb, 1117 is_unsnoopable, 1118 is_routable); 1119 default: 1120 return -EINVAL; 1121 } 1122 } 1123 1124 /** 1125 * batadv_mcast_forw_want_all_ip_count() - count nodes with unspecific mcast 1126 * interest 1127 * @bat_priv: the bat priv with all the soft interface information 1128 * @ethhdr: ethernet header of a packet 1129 * 1130 * Return: the number of nodes which want all IPv4 multicast traffic if the 1131 * given ethhdr is from an IPv4 packet or the number of nodes which want all 1132 * IPv6 traffic if it matches an IPv6 packet. 1133 */ 1134 static int batadv_mcast_forw_want_all_ip_count(struct batadv_priv *bat_priv, 1135 struct ethhdr *ethhdr) 1136 { 1137 switch (ntohs(ethhdr->h_proto)) { 1138 case ETH_P_IP: 1139 return atomic_read(&bat_priv->mcast.num_want_all_ipv4); 1140 case ETH_P_IPV6: 1141 return atomic_read(&bat_priv->mcast.num_want_all_ipv6); 1142 default: 1143 /* we shouldn't be here... */ 1144 return 0; 1145 } 1146 } 1147 1148 /** 1149 * batadv_mcast_forw_rtr_count() - count nodes with a multicast router 1150 * @bat_priv: the bat priv with all the soft interface information 1151 * @protocol: the ethernet protocol type to count multicast routers for 1152 * 1153 * Return: the number of nodes which want all routable IPv4 multicast traffic 1154 * if the protocol is ETH_P_IP or the number of nodes which want all routable 1155 * IPv6 traffic if the protocol is ETH_P_IPV6. Otherwise returns 0. 1156 */ 1157 1158 static int batadv_mcast_forw_rtr_count(struct batadv_priv *bat_priv, 1159 int protocol) 1160 { 1161 switch (protocol) { 1162 case ETH_P_IP: 1163 return atomic_read(&bat_priv->mcast.num_want_all_rtr4); 1164 case ETH_P_IPV6: 1165 return atomic_read(&bat_priv->mcast.num_want_all_rtr6); 1166 default: 1167 return 0; 1168 } 1169 } 1170 1171 /** 1172 * batadv_mcast_forw_tt_node_get() - get a multicast tt node 1173 * @bat_priv: the bat priv with all the soft interface information 1174 * @ethhdr: the ether header containing the multicast destination 1175 * 1176 * Return: an orig_node matching the multicast address provided by ethhdr 1177 * via a translation table lookup. This increases the returned nodes refcount. 1178 */ 1179 static struct batadv_orig_node * 1180 batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv, 1181 struct ethhdr *ethhdr) 1182 { 1183 return batadv_transtable_search(bat_priv, NULL, ethhdr->h_dest, 1184 BATADV_NO_FLAGS); 1185 } 1186 1187 /** 1188 * batadv_mcast_forw_ipv4_node_get() - get a node with an ipv4 flag 1189 * @bat_priv: the bat priv with all the soft interface information 1190 * 1191 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 flag set and 1192 * increases its refcount. 1193 */ 1194 static struct batadv_orig_node * 1195 batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv) 1196 { 1197 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; 1198 1199 rcu_read_lock(); 1200 hlist_for_each_entry_rcu(tmp_orig_node, 1201 &bat_priv->mcast.want_all_ipv4_list, 1202 mcast_want_all_ipv4_node) { 1203 if (!kref_get_unless_zero(&tmp_orig_node->refcount)) 1204 continue; 1205 1206 orig_node = tmp_orig_node; 1207 break; 1208 } 1209 rcu_read_unlock(); 1210 1211 return orig_node; 1212 } 1213 1214 /** 1215 * batadv_mcast_forw_ipv6_node_get() - get a node with an ipv6 flag 1216 * @bat_priv: the bat priv with all the soft interface information 1217 * 1218 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV6 flag set 1219 * and increases its refcount. 1220 */ 1221 static struct batadv_orig_node * 1222 batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv) 1223 { 1224 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; 1225 1226 rcu_read_lock(); 1227 hlist_for_each_entry_rcu(tmp_orig_node, 1228 &bat_priv->mcast.want_all_ipv6_list, 1229 mcast_want_all_ipv6_node) { 1230 if (!kref_get_unless_zero(&tmp_orig_node->refcount)) 1231 continue; 1232 1233 orig_node = tmp_orig_node; 1234 break; 1235 } 1236 rcu_read_unlock(); 1237 1238 return orig_node; 1239 } 1240 1241 /** 1242 * batadv_mcast_forw_ip_node_get() - get a node with an ipv4/ipv6 flag 1243 * @bat_priv: the bat priv with all the soft interface information 1244 * @ethhdr: an ethernet header to determine the protocol family from 1245 * 1246 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_IPV4 or 1247 * BATADV_MCAST_WANT_ALL_IPV6 flag, depending on the provided ethhdr, sets and 1248 * increases its refcount. 1249 */ 1250 static struct batadv_orig_node * 1251 batadv_mcast_forw_ip_node_get(struct batadv_priv *bat_priv, 1252 struct ethhdr *ethhdr) 1253 { 1254 switch (ntohs(ethhdr->h_proto)) { 1255 case ETH_P_IP: 1256 return batadv_mcast_forw_ipv4_node_get(bat_priv); 1257 case ETH_P_IPV6: 1258 return batadv_mcast_forw_ipv6_node_get(bat_priv); 1259 default: 1260 /* we shouldn't be here... */ 1261 return NULL; 1262 } 1263 } 1264 1265 /** 1266 * batadv_mcast_forw_unsnoop_node_get() - get a node with an unsnoopable flag 1267 * @bat_priv: the bat priv with all the soft interface information 1268 * 1269 * Return: an orig_node which has the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag 1270 * set and increases its refcount. 1271 */ 1272 static struct batadv_orig_node * 1273 batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv) 1274 { 1275 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; 1276 1277 rcu_read_lock(); 1278 hlist_for_each_entry_rcu(tmp_orig_node, 1279 &bat_priv->mcast.want_all_unsnoopables_list, 1280 mcast_want_all_unsnoopables_node) { 1281 if (!kref_get_unless_zero(&tmp_orig_node->refcount)) 1282 continue; 1283 1284 orig_node = tmp_orig_node; 1285 break; 1286 } 1287 rcu_read_unlock(); 1288 1289 return orig_node; 1290 } 1291 1292 /** 1293 * batadv_mcast_forw_rtr4_node_get() - get a node with an ipv4 mcast router flag 1294 * @bat_priv: the bat priv with all the soft interface information 1295 * 1296 * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR4 flag unset and 1297 * increases its refcount. 1298 */ 1299 static struct batadv_orig_node * 1300 batadv_mcast_forw_rtr4_node_get(struct batadv_priv *bat_priv) 1301 { 1302 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; 1303 1304 rcu_read_lock(); 1305 hlist_for_each_entry_rcu(tmp_orig_node, 1306 &bat_priv->mcast.want_all_rtr4_list, 1307 mcast_want_all_rtr4_node) { 1308 if (!kref_get_unless_zero(&tmp_orig_node->refcount)) 1309 continue; 1310 1311 orig_node = tmp_orig_node; 1312 break; 1313 } 1314 rcu_read_unlock(); 1315 1316 return orig_node; 1317 } 1318 1319 /** 1320 * batadv_mcast_forw_rtr6_node_get() - get a node with an ipv6 mcast router flag 1321 * @bat_priv: the bat priv with all the soft interface information 1322 * 1323 * Return: an orig_node which has the BATADV_MCAST_WANT_NO_RTR6 flag unset 1324 * and increases its refcount. 1325 */ 1326 static struct batadv_orig_node * 1327 batadv_mcast_forw_rtr6_node_get(struct batadv_priv *bat_priv) 1328 { 1329 struct batadv_orig_node *tmp_orig_node, *orig_node = NULL; 1330 1331 rcu_read_lock(); 1332 hlist_for_each_entry_rcu(tmp_orig_node, 1333 &bat_priv->mcast.want_all_rtr6_list, 1334 mcast_want_all_rtr6_node) { 1335 if (!kref_get_unless_zero(&tmp_orig_node->refcount)) 1336 continue; 1337 1338 orig_node = tmp_orig_node; 1339 break; 1340 } 1341 rcu_read_unlock(); 1342 1343 return orig_node; 1344 } 1345 1346 /** 1347 * batadv_mcast_forw_rtr_node_get() - get a node with an ipv4/ipv6 router flag 1348 * @bat_priv: the bat priv with all the soft interface information 1349 * @ethhdr: an ethernet header to determine the protocol family from 1350 * 1351 * Return: an orig_node which has no BATADV_MCAST_WANT_NO_RTR4 or 1352 * BATADV_MCAST_WANT_NO_RTR6 flag, depending on the provided ethhdr, set and 1353 * increases its refcount. 1354 */ 1355 static struct batadv_orig_node * 1356 batadv_mcast_forw_rtr_node_get(struct batadv_priv *bat_priv, 1357 struct ethhdr *ethhdr) 1358 { 1359 switch (ntohs(ethhdr->h_proto)) { 1360 case ETH_P_IP: 1361 return batadv_mcast_forw_rtr4_node_get(bat_priv); 1362 case ETH_P_IPV6: 1363 return batadv_mcast_forw_rtr6_node_get(bat_priv); 1364 default: 1365 /* we shouldn't be here... */ 1366 return NULL; 1367 } 1368 } 1369 1370 /** 1371 * batadv_mcast_forw_mode() - check on how to forward a multicast packet 1372 * @bat_priv: the bat priv with all the soft interface information 1373 * @skb: The multicast packet to check 1374 * @orig: an originator to be set to forward the skb to 1375 * 1376 * Return: the forwarding mode as enum batadv_forw_mode and in case of 1377 * BATADV_FORW_SINGLE set the orig to the single originator the skb 1378 * should be forwarded to. 1379 */ 1380 enum batadv_forw_mode 1381 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb, 1382 struct batadv_orig_node **orig) 1383 { 1384 int ret, tt_count, ip_count, unsnoop_count, total_count; 1385 bool is_unsnoopable = false; 1386 unsigned int mcast_fanout; 1387 struct ethhdr *ethhdr; 1388 int is_routable = 0; 1389 int rtr_count = 0; 1390 1391 ret = batadv_mcast_forw_mode_check(bat_priv, skb, &is_unsnoopable, 1392 &is_routable); 1393 if (ret == -ENOMEM) 1394 return BATADV_FORW_NONE; 1395 else if (ret < 0) 1396 return BATADV_FORW_ALL; 1397 1398 ethhdr = eth_hdr(skb); 1399 1400 tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest, 1401 BATADV_NO_FLAGS); 1402 ip_count = batadv_mcast_forw_want_all_ip_count(bat_priv, ethhdr); 1403 unsnoop_count = !is_unsnoopable ? 0 : 1404 atomic_read(&bat_priv->mcast.num_want_all_unsnoopables); 1405 rtr_count = batadv_mcast_forw_rtr_count(bat_priv, is_routable); 1406 1407 total_count = tt_count + ip_count + unsnoop_count + rtr_count; 1408 1409 switch (total_count) { 1410 case 1: 1411 if (tt_count) 1412 *orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr); 1413 else if (ip_count) 1414 *orig = batadv_mcast_forw_ip_node_get(bat_priv, ethhdr); 1415 else if (unsnoop_count) 1416 *orig = batadv_mcast_forw_unsnoop_node_get(bat_priv); 1417 else if (rtr_count) 1418 *orig = batadv_mcast_forw_rtr_node_get(bat_priv, 1419 ethhdr); 1420 1421 if (*orig) 1422 return BATADV_FORW_SINGLE; 1423 1424 fallthrough; 1425 case 0: 1426 return BATADV_FORW_NONE; 1427 default: 1428 mcast_fanout = atomic_read(&bat_priv->multicast_fanout); 1429 1430 if (!unsnoop_count && total_count <= mcast_fanout) 1431 return BATADV_FORW_SOME; 1432 } 1433 1434 return BATADV_FORW_ALL; 1435 } 1436 1437 /** 1438 * batadv_mcast_forw_send_orig() - send a multicast packet to an originator 1439 * @bat_priv: the bat priv with all the soft interface information 1440 * @skb: the multicast packet to send 1441 * @vid: the vlan identifier 1442 * @orig_node: the originator to send the packet to 1443 * 1444 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. 1445 */ 1446 int batadv_mcast_forw_send_orig(struct batadv_priv *bat_priv, 1447 struct sk_buff *skb, 1448 unsigned short vid, 1449 struct batadv_orig_node *orig_node) 1450 { 1451 /* Avoid sending multicast-in-unicast packets to other BLA 1452 * gateways - they already got the frame from the LAN side 1453 * we share with them. 1454 * TODO: Refactor to take BLA into account earlier, to avoid 1455 * reducing the mcast_fanout count. 1456 */ 1457 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid)) { 1458 dev_kfree_skb(skb); 1459 return NET_XMIT_SUCCESS; 1460 } 1461 1462 return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, 1463 orig_node, vid); 1464 } 1465 1466 /** 1467 * batadv_mcast_forw_tt() - forwards a packet to multicast listeners 1468 * @bat_priv: the bat priv with all the soft interface information 1469 * @skb: the multicast packet to transmit 1470 * @vid: the vlan identifier 1471 * 1472 * Sends copies of a frame with multicast destination to any multicast 1473 * listener registered in the translation table. A transmission is performed 1474 * via a batman-adv unicast packet for each such destination node. 1475 * 1476 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS 1477 * otherwise. 1478 */ 1479 static int 1480 batadv_mcast_forw_tt(struct batadv_priv *bat_priv, struct sk_buff *skb, 1481 unsigned short vid) 1482 { 1483 int ret = NET_XMIT_SUCCESS; 1484 struct sk_buff *newskb; 1485 1486 struct batadv_tt_orig_list_entry *orig_entry; 1487 1488 struct batadv_tt_global_entry *tt_global; 1489 const u8 *addr = eth_hdr(skb)->h_dest; 1490 1491 tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid); 1492 if (!tt_global) 1493 goto out; 1494 1495 rcu_read_lock(); 1496 hlist_for_each_entry_rcu(orig_entry, &tt_global->orig_list, list) { 1497 newskb = skb_copy(skb, GFP_ATOMIC); 1498 if (!newskb) { 1499 ret = NET_XMIT_DROP; 1500 break; 1501 } 1502 1503 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, 1504 orig_entry->orig_node); 1505 } 1506 rcu_read_unlock(); 1507 1508 batadv_tt_global_entry_put(tt_global); 1509 1510 out: 1511 return ret; 1512 } 1513 1514 /** 1515 * batadv_mcast_forw_want_all_ipv4() - forward to nodes with want-all-ipv4 1516 * @bat_priv: the bat priv with all the soft interface information 1517 * @skb: the multicast packet to transmit 1518 * @vid: the vlan identifier 1519 * 1520 * Sends copies of a frame with multicast destination to any node with a 1521 * BATADV_MCAST_WANT_ALL_IPV4 flag set. A transmission is performed via a 1522 * batman-adv unicast packet for each such destination node. 1523 * 1524 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS 1525 * otherwise. 1526 */ 1527 static int 1528 batadv_mcast_forw_want_all_ipv4(struct batadv_priv *bat_priv, 1529 struct sk_buff *skb, unsigned short vid) 1530 { 1531 struct batadv_orig_node *orig_node; 1532 int ret = NET_XMIT_SUCCESS; 1533 struct sk_buff *newskb; 1534 1535 rcu_read_lock(); 1536 hlist_for_each_entry_rcu(orig_node, 1537 &bat_priv->mcast.want_all_ipv4_list, 1538 mcast_want_all_ipv4_node) { 1539 newskb = skb_copy(skb, GFP_ATOMIC); 1540 if (!newskb) { 1541 ret = NET_XMIT_DROP; 1542 break; 1543 } 1544 1545 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); 1546 } 1547 rcu_read_unlock(); 1548 return ret; 1549 } 1550 1551 /** 1552 * batadv_mcast_forw_want_all_ipv6() - forward to nodes with want-all-ipv6 1553 * @bat_priv: the bat priv with all the soft interface information 1554 * @skb: The multicast packet to transmit 1555 * @vid: the vlan identifier 1556 * 1557 * Sends copies of a frame with multicast destination to any node with a 1558 * BATADV_MCAST_WANT_ALL_IPV6 flag set. A transmission is performed via a 1559 * batman-adv unicast packet for each such destination node. 1560 * 1561 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS 1562 * otherwise. 1563 */ 1564 static int 1565 batadv_mcast_forw_want_all_ipv6(struct batadv_priv *bat_priv, 1566 struct sk_buff *skb, unsigned short vid) 1567 { 1568 struct batadv_orig_node *orig_node; 1569 int ret = NET_XMIT_SUCCESS; 1570 struct sk_buff *newskb; 1571 1572 rcu_read_lock(); 1573 hlist_for_each_entry_rcu(orig_node, 1574 &bat_priv->mcast.want_all_ipv6_list, 1575 mcast_want_all_ipv6_node) { 1576 newskb = skb_copy(skb, GFP_ATOMIC); 1577 if (!newskb) { 1578 ret = NET_XMIT_DROP; 1579 break; 1580 } 1581 1582 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); 1583 } 1584 rcu_read_unlock(); 1585 return ret; 1586 } 1587 1588 /** 1589 * batadv_mcast_forw_want_all() - forward packet to nodes in a want-all list 1590 * @bat_priv: the bat priv with all the soft interface information 1591 * @skb: the multicast packet to transmit 1592 * @vid: the vlan identifier 1593 * 1594 * Sends copies of a frame with multicast destination to any node with a 1595 * BATADV_MCAST_WANT_ALL_IPV4 or BATADV_MCAST_WANT_ALL_IPV6 flag set. A 1596 * transmission is performed via a batman-adv unicast packet for each such 1597 * destination node. 1598 * 1599 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family 1600 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. 1601 */ 1602 static int 1603 batadv_mcast_forw_want_all(struct batadv_priv *bat_priv, 1604 struct sk_buff *skb, unsigned short vid) 1605 { 1606 switch (ntohs(eth_hdr(skb)->h_proto)) { 1607 case ETH_P_IP: 1608 return batadv_mcast_forw_want_all_ipv4(bat_priv, skb, vid); 1609 case ETH_P_IPV6: 1610 return batadv_mcast_forw_want_all_ipv6(bat_priv, skb, vid); 1611 default: 1612 /* we shouldn't be here... */ 1613 return NET_XMIT_DROP; 1614 } 1615 } 1616 1617 /** 1618 * batadv_mcast_forw_want_all_rtr4() - forward to nodes with want-all-rtr4 1619 * @bat_priv: the bat priv with all the soft interface information 1620 * @skb: the multicast packet to transmit 1621 * @vid: the vlan identifier 1622 * 1623 * Sends copies of a frame with multicast destination to any node with a 1624 * BATADV_MCAST_WANT_NO_RTR4 flag unset. A transmission is performed via a 1625 * batman-adv unicast packet for each such destination node. 1626 * 1627 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS 1628 * otherwise. 1629 */ 1630 static int 1631 batadv_mcast_forw_want_all_rtr4(struct batadv_priv *bat_priv, 1632 struct sk_buff *skb, unsigned short vid) 1633 { 1634 struct batadv_orig_node *orig_node; 1635 int ret = NET_XMIT_SUCCESS; 1636 struct sk_buff *newskb; 1637 1638 rcu_read_lock(); 1639 hlist_for_each_entry_rcu(orig_node, 1640 &bat_priv->mcast.want_all_rtr4_list, 1641 mcast_want_all_rtr4_node) { 1642 newskb = skb_copy(skb, GFP_ATOMIC); 1643 if (!newskb) { 1644 ret = NET_XMIT_DROP; 1645 break; 1646 } 1647 1648 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); 1649 } 1650 rcu_read_unlock(); 1651 return ret; 1652 } 1653 1654 /** 1655 * batadv_mcast_forw_want_all_rtr6() - forward to nodes with want-all-rtr6 1656 * @bat_priv: the bat priv with all the soft interface information 1657 * @skb: The multicast packet to transmit 1658 * @vid: the vlan identifier 1659 * 1660 * Sends copies of a frame with multicast destination to any node with a 1661 * BATADV_MCAST_WANT_NO_RTR6 flag unset. A transmission is performed via a 1662 * batman-adv unicast packet for each such destination node. 1663 * 1664 * Return: NET_XMIT_DROP on memory allocation failure, NET_XMIT_SUCCESS 1665 * otherwise. 1666 */ 1667 static int 1668 batadv_mcast_forw_want_all_rtr6(struct batadv_priv *bat_priv, 1669 struct sk_buff *skb, unsigned short vid) 1670 { 1671 struct batadv_orig_node *orig_node; 1672 int ret = NET_XMIT_SUCCESS; 1673 struct sk_buff *newskb; 1674 1675 rcu_read_lock(); 1676 hlist_for_each_entry_rcu(orig_node, 1677 &bat_priv->mcast.want_all_rtr6_list, 1678 mcast_want_all_rtr6_node) { 1679 newskb = skb_copy(skb, GFP_ATOMIC); 1680 if (!newskb) { 1681 ret = NET_XMIT_DROP; 1682 break; 1683 } 1684 1685 batadv_mcast_forw_send_orig(bat_priv, newskb, vid, orig_node); 1686 } 1687 rcu_read_unlock(); 1688 return ret; 1689 } 1690 1691 /** 1692 * batadv_mcast_forw_want_rtr() - forward packet to nodes in a want-all-rtr list 1693 * @bat_priv: the bat priv with all the soft interface information 1694 * @skb: the multicast packet to transmit 1695 * @vid: the vlan identifier 1696 * 1697 * Sends copies of a frame with multicast destination to any node with a 1698 * BATADV_MCAST_WANT_NO_RTR4 or BATADV_MCAST_WANT_NO_RTR6 flag unset. A 1699 * transmission is performed via a batman-adv unicast packet for each such 1700 * destination node. 1701 * 1702 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family 1703 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. 1704 */ 1705 static int 1706 batadv_mcast_forw_want_rtr(struct batadv_priv *bat_priv, 1707 struct sk_buff *skb, unsigned short vid) 1708 { 1709 switch (ntohs(eth_hdr(skb)->h_proto)) { 1710 case ETH_P_IP: 1711 return batadv_mcast_forw_want_all_rtr4(bat_priv, skb, vid); 1712 case ETH_P_IPV6: 1713 return batadv_mcast_forw_want_all_rtr6(bat_priv, skb, vid); 1714 default: 1715 /* we shouldn't be here... */ 1716 return NET_XMIT_DROP; 1717 } 1718 } 1719 1720 /** 1721 * batadv_mcast_forw_send() - send packet to any detected multicast recipient 1722 * @bat_priv: the bat priv with all the soft interface information 1723 * @skb: the multicast packet to transmit 1724 * @vid: the vlan identifier 1725 * 1726 * Sends copies of a frame with multicast destination to any node that signaled 1727 * interest in it, that is either via the translation table or the according 1728 * want-all flags. A transmission is performed via a batman-adv unicast packet 1729 * for each such destination node. 1730 * 1731 * The given skb is consumed/freed. 1732 * 1733 * Return: NET_XMIT_DROP on memory allocation failure or if the protocol family 1734 * is neither IPv4 nor IPv6. NET_XMIT_SUCCESS otherwise. 1735 */ 1736 int batadv_mcast_forw_send(struct batadv_priv *bat_priv, struct sk_buff *skb, 1737 unsigned short vid) 1738 { 1739 int ret; 1740 1741 ret = batadv_mcast_forw_tt(bat_priv, skb, vid); 1742 if (ret != NET_XMIT_SUCCESS) { 1743 kfree_skb(skb); 1744 return ret; 1745 } 1746 1747 ret = batadv_mcast_forw_want_all(bat_priv, skb, vid); 1748 if (ret != NET_XMIT_SUCCESS) { 1749 kfree_skb(skb); 1750 return ret; 1751 } 1752 1753 ret = batadv_mcast_forw_want_rtr(bat_priv, skb, vid); 1754 if (ret != NET_XMIT_SUCCESS) { 1755 kfree_skb(skb); 1756 return ret; 1757 } 1758 1759 consume_skb(skb); 1760 return ret; 1761 } 1762 1763 /** 1764 * batadv_mcast_want_unsnoop_update() - update unsnoop counter and list 1765 * @bat_priv: the bat priv with all the soft interface information 1766 * @orig: the orig_node which multicast state might have changed of 1767 * @mcast_flags: flags indicating the new multicast state 1768 * 1769 * If the BATADV_MCAST_WANT_ALL_UNSNOOPABLES flag of this originator, 1770 * orig, has toggled then this method updates the counter and the list 1771 * accordingly. 1772 * 1773 * Caller needs to hold orig->mcast_handler_lock. 1774 */ 1775 static void batadv_mcast_want_unsnoop_update(struct batadv_priv *bat_priv, 1776 struct batadv_orig_node *orig, 1777 u8 mcast_flags) 1778 { 1779 struct hlist_node *node = &orig->mcast_want_all_unsnoopables_node; 1780 struct hlist_head *head = &bat_priv->mcast.want_all_unsnoopables_list; 1781 1782 lockdep_assert_held(&orig->mcast_handler_lock); 1783 1784 /* switched from flag unset to set */ 1785 if (mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES && 1786 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)) { 1787 atomic_inc(&bat_priv->mcast.num_want_all_unsnoopables); 1788 1789 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1790 /* flag checks above + mcast_handler_lock prevents this */ 1791 WARN_ON(!hlist_unhashed(node)); 1792 1793 hlist_add_head_rcu(node, head); 1794 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1795 /* switched from flag set to unset */ 1796 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) && 1797 orig->mcast_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) { 1798 atomic_dec(&bat_priv->mcast.num_want_all_unsnoopables); 1799 1800 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1801 /* flag checks above + mcast_handler_lock prevents this */ 1802 WARN_ON(hlist_unhashed(node)); 1803 1804 hlist_del_init_rcu(node); 1805 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1806 } 1807 } 1808 1809 /** 1810 * batadv_mcast_want_ipv4_update() - update want-all-ipv4 counter and list 1811 * @bat_priv: the bat priv with all the soft interface information 1812 * @orig: the orig_node which multicast state might have changed of 1813 * @mcast_flags: flags indicating the new multicast state 1814 * 1815 * If the BATADV_MCAST_WANT_ALL_IPV4 flag of this originator, orig, has 1816 * toggled then this method updates the counter and the list accordingly. 1817 * 1818 * Caller needs to hold orig->mcast_handler_lock. 1819 */ 1820 static void batadv_mcast_want_ipv4_update(struct batadv_priv *bat_priv, 1821 struct batadv_orig_node *orig, 1822 u8 mcast_flags) 1823 { 1824 struct hlist_node *node = &orig->mcast_want_all_ipv4_node; 1825 struct hlist_head *head = &bat_priv->mcast.want_all_ipv4_list; 1826 1827 lockdep_assert_held(&orig->mcast_handler_lock); 1828 1829 /* switched from flag unset to set */ 1830 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4 && 1831 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4)) { 1832 atomic_inc(&bat_priv->mcast.num_want_all_ipv4); 1833 1834 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1835 /* flag checks above + mcast_handler_lock prevents this */ 1836 WARN_ON(!hlist_unhashed(node)); 1837 1838 hlist_add_head_rcu(node, head); 1839 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1840 /* switched from flag set to unset */ 1841 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) && 1842 orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) { 1843 atomic_dec(&bat_priv->mcast.num_want_all_ipv4); 1844 1845 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1846 /* flag checks above + mcast_handler_lock prevents this */ 1847 WARN_ON(hlist_unhashed(node)); 1848 1849 hlist_del_init_rcu(node); 1850 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1851 } 1852 } 1853 1854 /** 1855 * batadv_mcast_want_ipv6_update() - update want-all-ipv6 counter and list 1856 * @bat_priv: the bat priv with all the soft interface information 1857 * @orig: the orig_node which multicast state might have changed of 1858 * @mcast_flags: flags indicating the new multicast state 1859 * 1860 * If the BATADV_MCAST_WANT_ALL_IPV6 flag of this originator, orig, has 1861 * toggled then this method updates the counter and the list accordingly. 1862 * 1863 * Caller needs to hold orig->mcast_handler_lock. 1864 */ 1865 static void batadv_mcast_want_ipv6_update(struct batadv_priv *bat_priv, 1866 struct batadv_orig_node *orig, 1867 u8 mcast_flags) 1868 { 1869 struct hlist_node *node = &orig->mcast_want_all_ipv6_node; 1870 struct hlist_head *head = &bat_priv->mcast.want_all_ipv6_list; 1871 1872 lockdep_assert_held(&orig->mcast_handler_lock); 1873 1874 /* switched from flag unset to set */ 1875 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6 && 1876 !(orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6)) { 1877 atomic_inc(&bat_priv->mcast.num_want_all_ipv6); 1878 1879 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1880 /* flag checks above + mcast_handler_lock prevents this */ 1881 WARN_ON(!hlist_unhashed(node)); 1882 1883 hlist_add_head_rcu(node, head); 1884 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1885 /* switched from flag set to unset */ 1886 } else if (!(mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) && 1887 orig->mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) { 1888 atomic_dec(&bat_priv->mcast.num_want_all_ipv6); 1889 1890 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1891 /* flag checks above + mcast_handler_lock prevents this */ 1892 WARN_ON(hlist_unhashed(node)); 1893 1894 hlist_del_init_rcu(node); 1895 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1896 } 1897 } 1898 1899 /** 1900 * batadv_mcast_want_rtr4_update() - update want-all-rtr4 counter and list 1901 * @bat_priv: the bat priv with all the soft interface information 1902 * @orig: the orig_node which multicast state might have changed of 1903 * @mcast_flags: flags indicating the new multicast state 1904 * 1905 * If the BATADV_MCAST_WANT_NO_RTR4 flag of this originator, orig, has 1906 * toggled then this method updates the counter and the list accordingly. 1907 * 1908 * Caller needs to hold orig->mcast_handler_lock. 1909 */ 1910 static void batadv_mcast_want_rtr4_update(struct batadv_priv *bat_priv, 1911 struct batadv_orig_node *orig, 1912 u8 mcast_flags) 1913 { 1914 struct hlist_node *node = &orig->mcast_want_all_rtr4_node; 1915 struct hlist_head *head = &bat_priv->mcast.want_all_rtr4_list; 1916 1917 lockdep_assert_held(&orig->mcast_handler_lock); 1918 1919 /* switched from flag set to unset */ 1920 if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR4) && 1921 orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4) { 1922 atomic_inc(&bat_priv->mcast.num_want_all_rtr4); 1923 1924 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1925 /* flag checks above + mcast_handler_lock prevents this */ 1926 WARN_ON(!hlist_unhashed(node)); 1927 1928 hlist_add_head_rcu(node, head); 1929 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1930 /* switched from flag unset to set */ 1931 } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR4 && 1932 !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR4)) { 1933 atomic_dec(&bat_priv->mcast.num_want_all_rtr4); 1934 1935 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1936 /* flag checks above + mcast_handler_lock prevents this */ 1937 WARN_ON(hlist_unhashed(node)); 1938 1939 hlist_del_init_rcu(node); 1940 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1941 } 1942 } 1943 1944 /** 1945 * batadv_mcast_want_rtr6_update() - update want-all-rtr6 counter and list 1946 * @bat_priv: the bat priv with all the soft interface information 1947 * @orig: the orig_node which multicast state might have changed of 1948 * @mcast_flags: flags indicating the new multicast state 1949 * 1950 * If the BATADV_MCAST_WANT_NO_RTR6 flag of this originator, orig, has 1951 * toggled then this method updates the counter and the list accordingly. 1952 * 1953 * Caller needs to hold orig->mcast_handler_lock. 1954 */ 1955 static void batadv_mcast_want_rtr6_update(struct batadv_priv *bat_priv, 1956 struct batadv_orig_node *orig, 1957 u8 mcast_flags) 1958 { 1959 struct hlist_node *node = &orig->mcast_want_all_rtr6_node; 1960 struct hlist_head *head = &bat_priv->mcast.want_all_rtr6_list; 1961 1962 lockdep_assert_held(&orig->mcast_handler_lock); 1963 1964 /* switched from flag set to unset */ 1965 if (!(mcast_flags & BATADV_MCAST_WANT_NO_RTR6) && 1966 orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6) { 1967 atomic_inc(&bat_priv->mcast.num_want_all_rtr6); 1968 1969 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1970 /* flag checks above + mcast_handler_lock prevents this */ 1971 WARN_ON(!hlist_unhashed(node)); 1972 1973 hlist_add_head_rcu(node, head); 1974 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1975 /* switched from flag unset to set */ 1976 } else if (mcast_flags & BATADV_MCAST_WANT_NO_RTR6 && 1977 !(orig->mcast_flags & BATADV_MCAST_WANT_NO_RTR6)) { 1978 atomic_dec(&bat_priv->mcast.num_want_all_rtr6); 1979 1980 spin_lock_bh(&bat_priv->mcast.want_lists_lock); 1981 /* flag checks above + mcast_handler_lock prevents this */ 1982 WARN_ON(hlist_unhashed(node)); 1983 1984 hlist_del_init_rcu(node); 1985 spin_unlock_bh(&bat_priv->mcast.want_lists_lock); 1986 } 1987 } 1988 1989 /** 1990 * batadv_mcast_tvlv_flags_get() - get multicast flags from an OGM TVLV 1991 * @enabled: whether the originator has multicast TVLV support enabled 1992 * @tvlv_value: tvlv buffer containing the multicast flags 1993 * @tvlv_value_len: tvlv buffer length 1994 * 1995 * Return: multicast flags for the given tvlv buffer 1996 */ 1997 static u8 1998 batadv_mcast_tvlv_flags_get(bool enabled, void *tvlv_value, u16 tvlv_value_len) 1999 { 2000 u8 mcast_flags = BATADV_NO_FLAGS; 2001 2002 if (enabled && tvlv_value && tvlv_value_len >= sizeof(mcast_flags)) 2003 mcast_flags = *(u8 *)tvlv_value; 2004 2005 if (!enabled) { 2006 mcast_flags |= BATADV_MCAST_WANT_ALL_IPV4; 2007 mcast_flags |= BATADV_MCAST_WANT_ALL_IPV6; 2008 } 2009 2010 /* remove redundant flags to avoid sending duplicate packets later */ 2011 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV4) 2012 mcast_flags |= BATADV_MCAST_WANT_NO_RTR4; 2013 2014 if (mcast_flags & BATADV_MCAST_WANT_ALL_IPV6) 2015 mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; 2016 2017 return mcast_flags; 2018 } 2019 2020 /** 2021 * batadv_mcast_tvlv_ogm_handler() - process incoming multicast tvlv container 2022 * @bat_priv: the bat priv with all the soft interface information 2023 * @orig: the orig_node of the ogm 2024 * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) 2025 * @tvlv_value: tvlv buffer containing the multicast data 2026 * @tvlv_value_len: tvlv buffer length 2027 */ 2028 static void batadv_mcast_tvlv_ogm_handler(struct batadv_priv *bat_priv, 2029 struct batadv_orig_node *orig, 2030 u8 flags, 2031 void *tvlv_value, 2032 u16 tvlv_value_len) 2033 { 2034 bool orig_mcast_enabled = !(flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND); 2035 u8 mcast_flags; 2036 2037 mcast_flags = batadv_mcast_tvlv_flags_get(orig_mcast_enabled, 2038 tvlv_value, tvlv_value_len); 2039 2040 spin_lock_bh(&orig->mcast_handler_lock); 2041 2042 if (orig_mcast_enabled && 2043 !test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { 2044 set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); 2045 } else if (!orig_mcast_enabled && 2046 test_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities)) { 2047 clear_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capabilities); 2048 } 2049 2050 set_bit(BATADV_ORIG_CAPA_HAS_MCAST, &orig->capa_initialized); 2051 2052 batadv_mcast_want_unsnoop_update(bat_priv, orig, mcast_flags); 2053 batadv_mcast_want_ipv4_update(bat_priv, orig, mcast_flags); 2054 batadv_mcast_want_ipv6_update(bat_priv, orig, mcast_flags); 2055 batadv_mcast_want_rtr4_update(bat_priv, orig, mcast_flags); 2056 batadv_mcast_want_rtr6_update(bat_priv, orig, mcast_flags); 2057 2058 orig->mcast_flags = mcast_flags; 2059 spin_unlock_bh(&orig->mcast_handler_lock); 2060 } 2061 2062 /** 2063 * batadv_mcast_init() - initialize the multicast optimizations structures 2064 * @bat_priv: the bat priv with all the soft interface information 2065 */ 2066 void batadv_mcast_init(struct batadv_priv *bat_priv) 2067 { 2068 batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler, 2069 NULL, BATADV_TVLV_MCAST, 2, 2070 BATADV_TVLV_HANDLER_OGM_CIFNOTFND); 2071 2072 INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update); 2073 batadv_mcast_start_timer(bat_priv); 2074 } 2075 2076 /** 2077 * batadv_mcast_mesh_info_put() - put multicast info into a netlink message 2078 * @msg: buffer for the message 2079 * @bat_priv: the bat priv with all the soft interface information 2080 * 2081 * Return: 0 or error code. 2082 */ 2083 int batadv_mcast_mesh_info_put(struct sk_buff *msg, 2084 struct batadv_priv *bat_priv) 2085 { 2086 u32 flags = bat_priv->mcast.mla_flags.tvlv_flags; 2087 u32 flags_priv = BATADV_NO_FLAGS; 2088 2089 if (bat_priv->mcast.mla_flags.bridged) { 2090 flags_priv |= BATADV_MCAST_FLAGS_BRIDGED; 2091 2092 if (bat_priv->mcast.mla_flags.querier_ipv4.exists) 2093 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_EXISTS; 2094 if (bat_priv->mcast.mla_flags.querier_ipv6.exists) 2095 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_EXISTS; 2096 if (bat_priv->mcast.mla_flags.querier_ipv4.shadowing) 2097 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV4_SHADOWING; 2098 if (bat_priv->mcast.mla_flags.querier_ipv6.shadowing) 2099 flags_priv |= BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING; 2100 } 2101 2102 if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, flags) || 2103 nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS_PRIV, flags_priv)) 2104 return -EMSGSIZE; 2105 2106 return 0; 2107 } 2108 2109 /** 2110 * batadv_mcast_flags_dump_entry() - dump one entry of the multicast flags table 2111 * to a netlink socket 2112 * @msg: buffer for the message 2113 * @portid: netlink port 2114 * @cb: Control block containing additional options 2115 * @orig_node: originator to dump the multicast flags of 2116 * 2117 * Return: 0 or error code. 2118 */ 2119 static int 2120 batadv_mcast_flags_dump_entry(struct sk_buff *msg, u32 portid, 2121 struct netlink_callback *cb, 2122 struct batadv_orig_node *orig_node) 2123 { 2124 void *hdr; 2125 2126 hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq, 2127 &batadv_netlink_family, NLM_F_MULTI, 2128 BATADV_CMD_GET_MCAST_FLAGS); 2129 if (!hdr) 2130 return -ENOBUFS; 2131 2132 genl_dump_check_consistent(cb, hdr); 2133 2134 if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, 2135 orig_node->orig)) { 2136 genlmsg_cancel(msg, hdr); 2137 return -EMSGSIZE; 2138 } 2139 2140 if (test_bit(BATADV_ORIG_CAPA_HAS_MCAST, 2141 &orig_node->capabilities)) { 2142 if (nla_put_u32(msg, BATADV_ATTR_MCAST_FLAGS, 2143 orig_node->mcast_flags)) { 2144 genlmsg_cancel(msg, hdr); 2145 return -EMSGSIZE; 2146 } 2147 } 2148 2149 genlmsg_end(msg, hdr); 2150 return 0; 2151 } 2152 2153 /** 2154 * batadv_mcast_flags_dump_bucket() - dump one bucket of the multicast flags 2155 * table to a netlink socket 2156 * @msg: buffer for the message 2157 * @portid: netlink port 2158 * @cb: Control block containing additional options 2159 * @hash: hash to dump 2160 * @bucket: bucket index to dump 2161 * @idx_skip: How many entries to skip 2162 * 2163 * Return: 0 or error code. 2164 */ 2165 static int 2166 batadv_mcast_flags_dump_bucket(struct sk_buff *msg, u32 portid, 2167 struct netlink_callback *cb, 2168 struct batadv_hashtable *hash, 2169 unsigned int bucket, long *idx_skip) 2170 { 2171 struct batadv_orig_node *orig_node; 2172 long idx = 0; 2173 2174 spin_lock_bh(&hash->list_locks[bucket]); 2175 cb->seq = atomic_read(&hash->generation) << 1 | 1; 2176 2177 hlist_for_each_entry(orig_node, &hash->table[bucket], hash_entry) { 2178 if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST, 2179 &orig_node->capa_initialized)) 2180 continue; 2181 2182 if (idx < *idx_skip) 2183 goto skip; 2184 2185 if (batadv_mcast_flags_dump_entry(msg, portid, cb, orig_node)) { 2186 spin_unlock_bh(&hash->list_locks[bucket]); 2187 *idx_skip = idx; 2188 2189 return -EMSGSIZE; 2190 } 2191 2192 skip: 2193 idx++; 2194 } 2195 spin_unlock_bh(&hash->list_locks[bucket]); 2196 2197 return 0; 2198 } 2199 2200 /** 2201 * __batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket 2202 * @msg: buffer for the message 2203 * @portid: netlink port 2204 * @cb: Control block containing additional options 2205 * @bat_priv: the bat priv with all the soft interface information 2206 * @bucket: current bucket to dump 2207 * @idx: index in current bucket to the next entry to dump 2208 * 2209 * Return: 0 or error code. 2210 */ 2211 static int 2212 __batadv_mcast_flags_dump(struct sk_buff *msg, u32 portid, 2213 struct netlink_callback *cb, 2214 struct batadv_priv *bat_priv, long *bucket, long *idx) 2215 { 2216 struct batadv_hashtable *hash = bat_priv->orig_hash; 2217 long bucket_tmp = *bucket; 2218 long idx_tmp = *idx; 2219 2220 while (bucket_tmp < hash->size) { 2221 if (batadv_mcast_flags_dump_bucket(msg, portid, cb, hash, 2222 bucket_tmp, &idx_tmp)) 2223 break; 2224 2225 bucket_tmp++; 2226 idx_tmp = 0; 2227 } 2228 2229 *bucket = bucket_tmp; 2230 *idx = idx_tmp; 2231 2232 return msg->len; 2233 } 2234 2235 /** 2236 * batadv_mcast_netlink_get_primary() - get primary interface from netlink 2237 * callback 2238 * @cb: netlink callback structure 2239 * @primary_if: the primary interface pointer to return the result in 2240 * 2241 * Return: 0 or error code. 2242 */ 2243 static int 2244 batadv_mcast_netlink_get_primary(struct netlink_callback *cb, 2245 struct batadv_hard_iface **primary_if) 2246 { 2247 struct batadv_hard_iface *hard_iface = NULL; 2248 struct net *net = sock_net(cb->skb->sk); 2249 struct net_device *soft_iface; 2250 struct batadv_priv *bat_priv; 2251 int ifindex; 2252 int ret = 0; 2253 2254 ifindex = batadv_netlink_get_ifindex(cb->nlh, BATADV_ATTR_MESH_IFINDEX); 2255 if (!ifindex) 2256 return -EINVAL; 2257 2258 soft_iface = dev_get_by_index(net, ifindex); 2259 if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { 2260 ret = -ENODEV; 2261 goto out; 2262 } 2263 2264 bat_priv = netdev_priv(soft_iface); 2265 2266 hard_iface = batadv_primary_if_get_selected(bat_priv); 2267 if (!hard_iface || hard_iface->if_status != BATADV_IF_ACTIVE) { 2268 ret = -ENOENT; 2269 goto out; 2270 } 2271 2272 out: 2273 if (soft_iface) 2274 dev_put(soft_iface); 2275 2276 if (!ret && primary_if) 2277 *primary_if = hard_iface; 2278 else if (hard_iface) 2279 batadv_hardif_put(hard_iface); 2280 2281 return ret; 2282 } 2283 2284 /** 2285 * batadv_mcast_flags_dump() - dump multicast flags table to a netlink socket 2286 * @msg: buffer for the message 2287 * @cb: callback structure containing arguments 2288 * 2289 * Return: message length. 2290 */ 2291 int batadv_mcast_flags_dump(struct sk_buff *msg, struct netlink_callback *cb) 2292 { 2293 struct batadv_hard_iface *primary_if = NULL; 2294 int portid = NETLINK_CB(cb->skb).portid; 2295 struct batadv_priv *bat_priv; 2296 long *bucket = &cb->args[0]; 2297 long *idx = &cb->args[1]; 2298 int ret; 2299 2300 ret = batadv_mcast_netlink_get_primary(cb, &primary_if); 2301 if (ret) 2302 return ret; 2303 2304 bat_priv = netdev_priv(primary_if->soft_iface); 2305 ret = __batadv_mcast_flags_dump(msg, portid, cb, bat_priv, bucket, idx); 2306 2307 batadv_hardif_put(primary_if); 2308 return ret; 2309 } 2310 2311 /** 2312 * batadv_mcast_free() - free the multicast optimizations structures 2313 * @bat_priv: the bat priv with all the soft interface information 2314 */ 2315 void batadv_mcast_free(struct batadv_priv *bat_priv) 2316 { 2317 cancel_delayed_work_sync(&bat_priv->mcast.work); 2318 2319 batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2); 2320 batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2); 2321 2322 /* safely calling outside of worker, as worker was canceled above */ 2323 batadv_mcast_mla_tt_retract(bat_priv, NULL); 2324 } 2325 2326 /** 2327 * batadv_mcast_purge_orig() - reset originator global mcast state modifications 2328 * @orig: the originator which is going to get purged 2329 */ 2330 void batadv_mcast_purge_orig(struct batadv_orig_node *orig) 2331 { 2332 struct batadv_priv *bat_priv = orig->bat_priv; 2333 2334 spin_lock_bh(&orig->mcast_handler_lock); 2335 2336 batadv_mcast_want_unsnoop_update(bat_priv, orig, BATADV_NO_FLAGS); 2337 batadv_mcast_want_ipv4_update(bat_priv, orig, BATADV_NO_FLAGS); 2338 batadv_mcast_want_ipv6_update(bat_priv, orig, BATADV_NO_FLAGS); 2339 batadv_mcast_want_rtr4_update(bat_priv, orig, 2340 BATADV_MCAST_WANT_NO_RTR4); 2341 batadv_mcast_want_rtr6_update(bat_priv, orig, 2342 BATADV_MCAST_WANT_NO_RTR6); 2343 2344 spin_unlock_bh(&orig->mcast_handler_lock); 2345 } 2346