| 1 | /* |
| 2 | * Linux IPv6 multicast routing support for BSD pim6sd |
| 3 | * Based on net/ipv4/ipmr.c. |
| 4 | * |
| 5 | * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr> |
| 6 | * LSIIT Laboratory, Strasbourg, France |
| 7 | * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com> |
| 8 | * 6WIND, Paris, France |
| 9 | * Copyright (C)2007,2008 USAGI/WIDE Project |
| 10 | * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <asm/uaccess.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/timer.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/fcntl.h> |
| 27 | #include <linux/stat.h> |
| 28 | #include <linux/socket.h> |
| 29 | #include <linux/inet.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/inetdevice.h> |
| 32 | #include <linux/proc_fs.h> |
| 33 | #include <linux/seq_file.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/compat.h> |
| 37 | #include <net/protocol.h> |
| 38 | #include <linux/skbuff.h> |
| 39 | #include <net/sock.h> |
| 40 | #include <net/raw.h> |
| 41 | #include <linux/notifier.h> |
| 42 | #include <linux/if_arp.h> |
| 43 | #include <net/checksum.h> |
| 44 | #include <net/netlink.h> |
| 45 | #include <net/fib_rules.h> |
| 46 | |
| 47 | #include <net/ipv6.h> |
| 48 | #include <net/ip6_route.h> |
| 49 | #include <linux/mroute6.h> |
| 50 | #include <linux/pim.h> |
| 51 | #include <net/addrconf.h> |
| 52 | #include <linux/netfilter_ipv6.h> |
| 53 | #include <linux/export.h> |
| 54 | #include <net/ip6_checksum.h> |
| 55 | #include <linux/netconf.h> |
| 56 | |
| 57 | struct mr6_table { |
| 58 | struct list_head list; |
| 59 | possible_net_t net; |
| 60 | u32 id; |
| 61 | struct sock *mroute6_sk; |
| 62 | struct timer_list ipmr_expire_timer; |
| 63 | struct list_head mfc6_unres_queue; |
| 64 | struct list_head mfc6_cache_array[MFC6_LINES]; |
| 65 | struct mif_device vif6_table[MAXMIFS]; |
| 66 | int maxvif; |
| 67 | atomic_t cache_resolve_queue_len; |
| 68 | bool mroute_do_assert; |
| 69 | bool mroute_do_pim; |
| 70 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 71 | int mroute_reg_vif_num; |
| 72 | #endif |
| 73 | }; |
| 74 | |
| 75 | struct ip6mr_rule { |
| 76 | struct fib_rule common; |
| 77 | }; |
| 78 | |
| 79 | struct ip6mr_result { |
| 80 | struct mr6_table *mrt; |
| 81 | }; |
| 82 | |
| 83 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
| 84 | Note that the changes are semaphored via rtnl_lock. |
| 85 | */ |
| 86 | |
| 87 | static DEFINE_RWLOCK(mrt_lock); |
| 88 | |
| 89 | /* |
| 90 | * Multicast router control variables |
| 91 | */ |
| 92 | |
| 93 | #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL) |
| 94 | |
| 95 | /* Special spinlock for queue of unresolved entries */ |
| 96 | static DEFINE_SPINLOCK(mfc_unres_lock); |
| 97 | |
| 98 | /* We return to original Alan's scheme. Hash table of resolved |
| 99 | entries is changed only in process context and protected |
| 100 | with weak lock mrt_lock. Queue of unresolved entries is protected |
| 101 | with strong spinlock mfc_unres_lock. |
| 102 | |
| 103 | In this case data path is free of exclusive locks at all. |
| 104 | */ |
| 105 | |
| 106 | static struct kmem_cache *mrt_cachep __read_mostly; |
| 107 | |
| 108 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id); |
| 109 | static void ip6mr_free_table(struct mr6_table *mrt); |
| 110 | |
| 111 | static void ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
| 112 | struct sk_buff *skb, struct mfc6_cache *cache); |
| 113 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, |
| 114 | mifi_t mifi, int assert); |
| 115 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
| 116 | struct mfc6_cache *c, struct rtmsg *rtm); |
| 117 | static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc, |
| 118 | int cmd); |
| 119 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, |
| 120 | struct netlink_callback *cb); |
| 121 | static void mroute_clean_tables(struct mr6_table *mrt); |
| 122 | static void ipmr_expire_process(unsigned long arg); |
| 123 | |
| 124 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES |
| 125 | #define ip6mr_for_each_table(mrt, net) \ |
| 126 | list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list) |
| 127 | |
| 128 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) |
| 129 | { |
| 130 | struct mr6_table *mrt; |
| 131 | |
| 132 | ip6mr_for_each_table(mrt, net) { |
| 133 | if (mrt->id == id) |
| 134 | return mrt; |
| 135 | } |
| 136 | return NULL; |
| 137 | } |
| 138 | |
| 139 | static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
| 140 | struct mr6_table **mrt) |
| 141 | { |
| 142 | int err; |
| 143 | struct ip6mr_result res; |
| 144 | struct fib_lookup_arg arg = { |
| 145 | .result = &res, |
| 146 | .flags = FIB_LOOKUP_NOREF, |
| 147 | }; |
| 148 | |
| 149 | err = fib_rules_lookup(net->ipv6.mr6_rules_ops, |
| 150 | flowi6_to_flowi(flp6), 0, &arg); |
| 151 | if (err < 0) |
| 152 | return err; |
| 153 | *mrt = res.mrt; |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, |
| 158 | int flags, struct fib_lookup_arg *arg) |
| 159 | { |
| 160 | struct ip6mr_result *res = arg->result; |
| 161 | struct mr6_table *mrt; |
| 162 | |
| 163 | switch (rule->action) { |
| 164 | case FR_ACT_TO_TBL: |
| 165 | break; |
| 166 | case FR_ACT_UNREACHABLE: |
| 167 | return -ENETUNREACH; |
| 168 | case FR_ACT_PROHIBIT: |
| 169 | return -EACCES; |
| 170 | case FR_ACT_BLACKHOLE: |
| 171 | default: |
| 172 | return -EINVAL; |
| 173 | } |
| 174 | |
| 175 | mrt = ip6mr_get_table(rule->fr_net, rule->table); |
| 176 | if (!mrt) |
| 177 | return -EAGAIN; |
| 178 | res->mrt = mrt; |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) |
| 183 | { |
| 184 | return 1; |
| 185 | } |
| 186 | |
| 187 | static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = { |
| 188 | FRA_GENERIC_POLICY, |
| 189 | }; |
| 190 | |
| 191 | static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
| 192 | struct fib_rule_hdr *frh, struct nlattr **tb) |
| 193 | { |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| 198 | struct nlattr **tb) |
| 199 | { |
| 200 | return 1; |
| 201 | } |
| 202 | |
| 203 | static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
| 204 | struct fib_rule_hdr *frh) |
| 205 | { |
| 206 | frh->dst_len = 0; |
| 207 | frh->src_len = 0; |
| 208 | frh->tos = 0; |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = { |
| 213 | .family = RTNL_FAMILY_IP6MR, |
| 214 | .rule_size = sizeof(struct ip6mr_rule), |
| 215 | .addr_size = sizeof(struct in6_addr), |
| 216 | .action = ip6mr_rule_action, |
| 217 | .match = ip6mr_rule_match, |
| 218 | .configure = ip6mr_rule_configure, |
| 219 | .compare = ip6mr_rule_compare, |
| 220 | .default_pref = fib_default_rule_pref, |
| 221 | .fill = ip6mr_rule_fill, |
| 222 | .nlgroup = RTNLGRP_IPV6_RULE, |
| 223 | .policy = ip6mr_rule_policy, |
| 224 | .owner = THIS_MODULE, |
| 225 | }; |
| 226 | |
| 227 | static int __net_init ip6mr_rules_init(struct net *net) |
| 228 | { |
| 229 | struct fib_rules_ops *ops; |
| 230 | struct mr6_table *mrt; |
| 231 | int err; |
| 232 | |
| 233 | ops = fib_rules_register(&ip6mr_rules_ops_template, net); |
| 234 | if (IS_ERR(ops)) |
| 235 | return PTR_ERR(ops); |
| 236 | |
| 237 | INIT_LIST_HEAD(&net->ipv6.mr6_tables); |
| 238 | |
| 239 | mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); |
| 240 | if (!mrt) { |
| 241 | err = -ENOMEM; |
| 242 | goto err1; |
| 243 | } |
| 244 | |
| 245 | err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); |
| 246 | if (err < 0) |
| 247 | goto err2; |
| 248 | |
| 249 | net->ipv6.mr6_rules_ops = ops; |
| 250 | return 0; |
| 251 | |
| 252 | err2: |
| 253 | ip6mr_free_table(mrt); |
| 254 | err1: |
| 255 | fib_rules_unregister(ops); |
| 256 | return err; |
| 257 | } |
| 258 | |
| 259 | static void __net_exit ip6mr_rules_exit(struct net *net) |
| 260 | { |
| 261 | struct mr6_table *mrt, *next; |
| 262 | |
| 263 | rtnl_lock(); |
| 264 | list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { |
| 265 | list_del(&mrt->list); |
| 266 | ip6mr_free_table(mrt); |
| 267 | } |
| 268 | fib_rules_unregister(net->ipv6.mr6_rules_ops); |
| 269 | rtnl_unlock(); |
| 270 | } |
| 271 | #else |
| 272 | #define ip6mr_for_each_table(mrt, net) \ |
| 273 | for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) |
| 274 | |
| 275 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) |
| 276 | { |
| 277 | return net->ipv6.mrt6; |
| 278 | } |
| 279 | |
| 280 | static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
| 281 | struct mr6_table **mrt) |
| 282 | { |
| 283 | *mrt = net->ipv6.mrt6; |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int __net_init ip6mr_rules_init(struct net *net) |
| 288 | { |
| 289 | net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT); |
| 290 | return net->ipv6.mrt6 ? 0 : -ENOMEM; |
| 291 | } |
| 292 | |
| 293 | static void __net_exit ip6mr_rules_exit(struct net *net) |
| 294 | { |
| 295 | rtnl_lock(); |
| 296 | ip6mr_free_table(net->ipv6.mrt6); |
| 297 | net->ipv6.mrt6 = NULL; |
| 298 | rtnl_unlock(); |
| 299 | } |
| 300 | #endif |
| 301 | |
| 302 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id) |
| 303 | { |
| 304 | struct mr6_table *mrt; |
| 305 | unsigned int i; |
| 306 | |
| 307 | mrt = ip6mr_get_table(net, id); |
| 308 | if (mrt) |
| 309 | return mrt; |
| 310 | |
| 311 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); |
| 312 | if (!mrt) |
| 313 | return NULL; |
| 314 | mrt->id = id; |
| 315 | write_pnet(&mrt->net, net); |
| 316 | |
| 317 | /* Forwarding cache */ |
| 318 | for (i = 0; i < MFC6_LINES; i++) |
| 319 | INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]); |
| 320 | |
| 321 | INIT_LIST_HEAD(&mrt->mfc6_unres_queue); |
| 322 | |
| 323 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, |
| 324 | (unsigned long)mrt); |
| 325 | |
| 326 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 327 | mrt->mroute_reg_vif_num = -1; |
| 328 | #endif |
| 329 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES |
| 330 | list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); |
| 331 | #endif |
| 332 | return mrt; |
| 333 | } |
| 334 | |
| 335 | static void ip6mr_free_table(struct mr6_table *mrt) |
| 336 | { |
| 337 | del_timer_sync(&mrt->ipmr_expire_timer); |
| 338 | mroute_clean_tables(mrt); |
| 339 | kfree(mrt); |
| 340 | } |
| 341 | |
| 342 | #ifdef CONFIG_PROC_FS |
| 343 | |
| 344 | struct ipmr_mfc_iter { |
| 345 | struct seq_net_private p; |
| 346 | struct mr6_table *mrt; |
| 347 | struct list_head *cache; |
| 348 | int ct; |
| 349 | }; |
| 350 | |
| 351 | |
| 352 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
| 353 | struct ipmr_mfc_iter *it, loff_t pos) |
| 354 | { |
| 355 | struct mr6_table *mrt = it->mrt; |
| 356 | struct mfc6_cache *mfc; |
| 357 | |
| 358 | read_lock(&mrt_lock); |
| 359 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) { |
| 360 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
| 361 | list_for_each_entry(mfc, it->cache, list) |
| 362 | if (pos-- == 0) |
| 363 | return mfc; |
| 364 | } |
| 365 | read_unlock(&mrt_lock); |
| 366 | |
| 367 | spin_lock_bh(&mfc_unres_lock); |
| 368 | it->cache = &mrt->mfc6_unres_queue; |
| 369 | list_for_each_entry(mfc, it->cache, list) |
| 370 | if (pos-- == 0) |
| 371 | return mfc; |
| 372 | spin_unlock_bh(&mfc_unres_lock); |
| 373 | |
| 374 | it->cache = NULL; |
| 375 | return NULL; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif |
| 380 | */ |
| 381 | |
| 382 | struct ipmr_vif_iter { |
| 383 | struct seq_net_private p; |
| 384 | struct mr6_table *mrt; |
| 385 | int ct; |
| 386 | }; |
| 387 | |
| 388 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
| 389 | struct ipmr_vif_iter *iter, |
| 390 | loff_t pos) |
| 391 | { |
| 392 | struct mr6_table *mrt = iter->mrt; |
| 393 | |
| 394 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { |
| 395 | if (!MIF_EXISTS(mrt, iter->ct)) |
| 396 | continue; |
| 397 | if (pos-- == 0) |
| 398 | return &mrt->vif6_table[iter->ct]; |
| 399 | } |
| 400 | return NULL; |
| 401 | } |
| 402 | |
| 403 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
| 404 | __acquires(mrt_lock) |
| 405 | { |
| 406 | struct ipmr_vif_iter *iter = seq->private; |
| 407 | struct net *net = seq_file_net(seq); |
| 408 | struct mr6_table *mrt; |
| 409 | |
| 410 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
| 411 | if (!mrt) |
| 412 | return ERR_PTR(-ENOENT); |
| 413 | |
| 414 | iter->mrt = mrt; |
| 415 | |
| 416 | read_lock(&mrt_lock); |
| 417 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
| 418 | : SEQ_START_TOKEN; |
| 419 | } |
| 420 | |
| 421 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 422 | { |
| 423 | struct ipmr_vif_iter *iter = seq->private; |
| 424 | struct net *net = seq_file_net(seq); |
| 425 | struct mr6_table *mrt = iter->mrt; |
| 426 | |
| 427 | ++*pos; |
| 428 | if (v == SEQ_START_TOKEN) |
| 429 | return ip6mr_vif_seq_idx(net, iter, 0); |
| 430 | |
| 431 | while (++iter->ct < mrt->maxvif) { |
| 432 | if (!MIF_EXISTS(mrt, iter->ct)) |
| 433 | continue; |
| 434 | return &mrt->vif6_table[iter->ct]; |
| 435 | } |
| 436 | return NULL; |
| 437 | } |
| 438 | |
| 439 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) |
| 440 | __releases(mrt_lock) |
| 441 | { |
| 442 | read_unlock(&mrt_lock); |
| 443 | } |
| 444 | |
| 445 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) |
| 446 | { |
| 447 | struct ipmr_vif_iter *iter = seq->private; |
| 448 | struct mr6_table *mrt = iter->mrt; |
| 449 | |
| 450 | if (v == SEQ_START_TOKEN) { |
| 451 | seq_puts(seq, |
| 452 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); |
| 453 | } else { |
| 454 | const struct mif_device *vif = v; |
| 455 | const char *name = vif->dev ? vif->dev->name : "none"; |
| 456 | |
| 457 | seq_printf(seq, |
| 458 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
| 459 | vif - mrt->vif6_table, |
| 460 | name, vif->bytes_in, vif->pkt_in, |
| 461 | vif->bytes_out, vif->pkt_out, |
| 462 | vif->flags); |
| 463 | } |
| 464 | return 0; |
| 465 | } |
| 466 | |
| 467 | static const struct seq_operations ip6mr_vif_seq_ops = { |
| 468 | .start = ip6mr_vif_seq_start, |
| 469 | .next = ip6mr_vif_seq_next, |
| 470 | .stop = ip6mr_vif_seq_stop, |
| 471 | .show = ip6mr_vif_seq_show, |
| 472 | }; |
| 473 | |
| 474 | static int ip6mr_vif_open(struct inode *inode, struct file *file) |
| 475 | { |
| 476 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
| 477 | sizeof(struct ipmr_vif_iter)); |
| 478 | } |
| 479 | |
| 480 | static const struct file_operations ip6mr_vif_fops = { |
| 481 | .owner = THIS_MODULE, |
| 482 | .open = ip6mr_vif_open, |
| 483 | .read = seq_read, |
| 484 | .llseek = seq_lseek, |
| 485 | .release = seq_release_net, |
| 486 | }; |
| 487 | |
| 488 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
| 489 | { |
| 490 | struct ipmr_mfc_iter *it = seq->private; |
| 491 | struct net *net = seq_file_net(seq); |
| 492 | struct mr6_table *mrt; |
| 493 | |
| 494 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
| 495 | if (!mrt) |
| 496 | return ERR_PTR(-ENOENT); |
| 497 | |
| 498 | it->mrt = mrt; |
| 499 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
| 500 | : SEQ_START_TOKEN; |
| 501 | } |
| 502 | |
| 503 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 504 | { |
| 505 | struct mfc6_cache *mfc = v; |
| 506 | struct ipmr_mfc_iter *it = seq->private; |
| 507 | struct net *net = seq_file_net(seq); |
| 508 | struct mr6_table *mrt = it->mrt; |
| 509 | |
| 510 | ++*pos; |
| 511 | |
| 512 | if (v == SEQ_START_TOKEN) |
| 513 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
| 514 | |
| 515 | if (mfc->list.next != it->cache) |
| 516 | return list_entry(mfc->list.next, struct mfc6_cache, list); |
| 517 | |
| 518 | if (it->cache == &mrt->mfc6_unres_queue) |
| 519 | goto end_of_list; |
| 520 | |
| 521 | BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]); |
| 522 | |
| 523 | while (++it->ct < MFC6_LINES) { |
| 524 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
| 525 | if (list_empty(it->cache)) |
| 526 | continue; |
| 527 | return list_first_entry(it->cache, struct mfc6_cache, list); |
| 528 | } |
| 529 | |
| 530 | /* exhausted cache_array, show unresolved */ |
| 531 | read_unlock(&mrt_lock); |
| 532 | it->cache = &mrt->mfc6_unres_queue; |
| 533 | it->ct = 0; |
| 534 | |
| 535 | spin_lock_bh(&mfc_unres_lock); |
| 536 | if (!list_empty(it->cache)) |
| 537 | return list_first_entry(it->cache, struct mfc6_cache, list); |
| 538 | |
| 539 | end_of_list: |
| 540 | spin_unlock_bh(&mfc_unres_lock); |
| 541 | it->cache = NULL; |
| 542 | |
| 543 | return NULL; |
| 544 | } |
| 545 | |
| 546 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) |
| 547 | { |
| 548 | struct ipmr_mfc_iter *it = seq->private; |
| 549 | struct mr6_table *mrt = it->mrt; |
| 550 | |
| 551 | if (it->cache == &mrt->mfc6_unres_queue) |
| 552 | spin_unlock_bh(&mfc_unres_lock); |
| 553 | else if (it->cache == mrt->mfc6_cache_array) |
| 554 | read_unlock(&mrt_lock); |
| 555 | } |
| 556 | |
| 557 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) |
| 558 | { |
| 559 | int n; |
| 560 | |
| 561 | if (v == SEQ_START_TOKEN) { |
| 562 | seq_puts(seq, |
| 563 | "Group " |
| 564 | "Origin " |
| 565 | "Iif Pkts Bytes Wrong Oifs\n"); |
| 566 | } else { |
| 567 | const struct mfc6_cache *mfc = v; |
| 568 | const struct ipmr_mfc_iter *it = seq->private; |
| 569 | struct mr6_table *mrt = it->mrt; |
| 570 | |
| 571 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
| 572 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
| 573 | mfc->mf6c_parent); |
| 574 | |
| 575 | if (it->cache != &mrt->mfc6_unres_queue) { |
| 576 | seq_printf(seq, " %8lu %8lu %8lu", |
| 577 | mfc->mfc_un.res.pkt, |
| 578 | mfc->mfc_un.res.bytes, |
| 579 | mfc->mfc_un.res.wrong_if); |
| 580 | for (n = mfc->mfc_un.res.minvif; |
| 581 | n < mfc->mfc_un.res.maxvif; n++) { |
| 582 | if (MIF_EXISTS(mrt, n) && |
| 583 | mfc->mfc_un.res.ttls[n] < 255) |
| 584 | seq_printf(seq, |
| 585 | " %2d:%-3d", |
| 586 | n, mfc->mfc_un.res.ttls[n]); |
| 587 | } |
| 588 | } else { |
| 589 | /* unresolved mfc_caches don't contain |
| 590 | * pkt, bytes and wrong_if values |
| 591 | */ |
| 592 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); |
| 593 | } |
| 594 | seq_putc(seq, '\n'); |
| 595 | } |
| 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | static const struct seq_operations ipmr_mfc_seq_ops = { |
| 600 | .start = ipmr_mfc_seq_start, |
| 601 | .next = ipmr_mfc_seq_next, |
| 602 | .stop = ipmr_mfc_seq_stop, |
| 603 | .show = ipmr_mfc_seq_show, |
| 604 | }; |
| 605 | |
| 606 | static int ipmr_mfc_open(struct inode *inode, struct file *file) |
| 607 | { |
| 608 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
| 609 | sizeof(struct ipmr_mfc_iter)); |
| 610 | } |
| 611 | |
| 612 | static const struct file_operations ip6mr_mfc_fops = { |
| 613 | .owner = THIS_MODULE, |
| 614 | .open = ipmr_mfc_open, |
| 615 | .read = seq_read, |
| 616 | .llseek = seq_lseek, |
| 617 | .release = seq_release_net, |
| 618 | }; |
| 619 | #endif |
| 620 | |
| 621 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 622 | |
| 623 | static int pim6_rcv(struct sk_buff *skb) |
| 624 | { |
| 625 | struct pimreghdr *pim; |
| 626 | struct ipv6hdr *encap; |
| 627 | struct net_device *reg_dev = NULL; |
| 628 | struct net *net = dev_net(skb->dev); |
| 629 | struct mr6_table *mrt; |
| 630 | struct flowi6 fl6 = { |
| 631 | .flowi6_iif = skb->dev->ifindex, |
| 632 | .flowi6_mark = skb->mark, |
| 633 | }; |
| 634 | int reg_vif_num; |
| 635 | |
| 636 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
| 637 | goto drop; |
| 638 | |
| 639 | pim = (struct pimreghdr *)skb_transport_header(skb); |
| 640 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || |
| 641 | (pim->flags & PIM_NULL_REGISTER) || |
| 642 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
| 643 | sizeof(*pim), IPPROTO_PIM, |
| 644 | csum_partial((void *)pim, sizeof(*pim), 0)) && |
| 645 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
| 646 | goto drop; |
| 647 | |
| 648 | /* check if the inner packet is destined to mcast group */ |
| 649 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + |
| 650 | sizeof(*pim)); |
| 651 | |
| 652 | if (!ipv6_addr_is_multicast(&encap->daddr) || |
| 653 | encap->payload_len == 0 || |
| 654 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) |
| 655 | goto drop; |
| 656 | |
| 657 | if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
| 658 | goto drop; |
| 659 | reg_vif_num = mrt->mroute_reg_vif_num; |
| 660 | |
| 661 | read_lock(&mrt_lock); |
| 662 | if (reg_vif_num >= 0) |
| 663 | reg_dev = mrt->vif6_table[reg_vif_num].dev; |
| 664 | if (reg_dev) |
| 665 | dev_hold(reg_dev); |
| 666 | read_unlock(&mrt_lock); |
| 667 | |
| 668 | if (!reg_dev) |
| 669 | goto drop; |
| 670 | |
| 671 | skb->mac_header = skb->network_header; |
| 672 | skb_pull(skb, (u8 *)encap - skb->data); |
| 673 | skb_reset_network_header(skb); |
| 674 | skb->protocol = htons(ETH_P_IPV6); |
| 675 | skb->ip_summed = CHECKSUM_NONE; |
| 676 | |
| 677 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
| 678 | |
| 679 | netif_rx(skb); |
| 680 | |
| 681 | dev_put(reg_dev); |
| 682 | return 0; |
| 683 | drop: |
| 684 | kfree_skb(skb); |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static const struct inet6_protocol pim6_protocol = { |
| 689 | .handler = pim6_rcv, |
| 690 | }; |
| 691 | |
| 692 | /* Service routines creating virtual interfaces: PIMREG */ |
| 693 | |
| 694 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
| 695 | struct net_device *dev) |
| 696 | { |
| 697 | struct net *net = dev_net(dev); |
| 698 | struct mr6_table *mrt; |
| 699 | struct flowi6 fl6 = { |
| 700 | .flowi6_oif = dev->ifindex, |
| 701 | .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
| 702 | .flowi6_mark = skb->mark, |
| 703 | }; |
| 704 | int err; |
| 705 | |
| 706 | err = ip6mr_fib_lookup(net, &fl6, &mrt); |
| 707 | if (err < 0) { |
| 708 | kfree_skb(skb); |
| 709 | return err; |
| 710 | } |
| 711 | |
| 712 | read_lock(&mrt_lock); |
| 713 | dev->stats.tx_bytes += skb->len; |
| 714 | dev->stats.tx_packets++; |
| 715 | ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); |
| 716 | read_unlock(&mrt_lock); |
| 717 | kfree_skb(skb); |
| 718 | return NETDEV_TX_OK; |
| 719 | } |
| 720 | |
| 721 | static int reg_vif_get_iflink(const struct net_device *dev) |
| 722 | { |
| 723 | return 0; |
| 724 | } |
| 725 | |
| 726 | static const struct net_device_ops reg_vif_netdev_ops = { |
| 727 | .ndo_start_xmit = reg_vif_xmit, |
| 728 | .ndo_get_iflink = reg_vif_get_iflink, |
| 729 | }; |
| 730 | |
| 731 | static void reg_vif_setup(struct net_device *dev) |
| 732 | { |
| 733 | dev->type = ARPHRD_PIMREG; |
| 734 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; |
| 735 | dev->flags = IFF_NOARP; |
| 736 | dev->netdev_ops = ®_vif_netdev_ops; |
| 737 | dev->destructor = free_netdev; |
| 738 | dev->features |= NETIF_F_NETNS_LOCAL; |
| 739 | } |
| 740 | |
| 741 | static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt) |
| 742 | { |
| 743 | struct net_device *dev; |
| 744 | char name[IFNAMSIZ]; |
| 745 | |
| 746 | if (mrt->id == RT6_TABLE_DFLT) |
| 747 | sprintf(name, "pim6reg"); |
| 748 | else |
| 749 | sprintf(name, "pim6reg%u", mrt->id); |
| 750 | |
| 751 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
| 752 | if (!dev) |
| 753 | return NULL; |
| 754 | |
| 755 | dev_net_set(dev, net); |
| 756 | |
| 757 | if (register_netdevice(dev)) { |
| 758 | free_netdev(dev); |
| 759 | return NULL; |
| 760 | } |
| 761 | |
| 762 | if (dev_open(dev)) |
| 763 | goto failure; |
| 764 | |
| 765 | dev_hold(dev); |
| 766 | return dev; |
| 767 | |
| 768 | failure: |
| 769 | /* allow the register to be completed before unregistering. */ |
| 770 | rtnl_unlock(); |
| 771 | rtnl_lock(); |
| 772 | |
| 773 | unregister_netdevice(dev); |
| 774 | return NULL; |
| 775 | } |
| 776 | #endif |
| 777 | |
| 778 | /* |
| 779 | * Delete a VIF entry |
| 780 | */ |
| 781 | |
| 782 | static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head) |
| 783 | { |
| 784 | struct mif_device *v; |
| 785 | struct net_device *dev; |
| 786 | struct inet6_dev *in6_dev; |
| 787 | |
| 788 | if (vifi < 0 || vifi >= mrt->maxvif) |
| 789 | return -EADDRNOTAVAIL; |
| 790 | |
| 791 | v = &mrt->vif6_table[vifi]; |
| 792 | |
| 793 | write_lock_bh(&mrt_lock); |
| 794 | dev = v->dev; |
| 795 | v->dev = NULL; |
| 796 | |
| 797 | if (!dev) { |
| 798 | write_unlock_bh(&mrt_lock); |
| 799 | return -EADDRNOTAVAIL; |
| 800 | } |
| 801 | |
| 802 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 803 | if (vifi == mrt->mroute_reg_vif_num) |
| 804 | mrt->mroute_reg_vif_num = -1; |
| 805 | #endif |
| 806 | |
| 807 | if (vifi + 1 == mrt->maxvif) { |
| 808 | int tmp; |
| 809 | for (tmp = vifi - 1; tmp >= 0; tmp--) { |
| 810 | if (MIF_EXISTS(mrt, tmp)) |
| 811 | break; |
| 812 | } |
| 813 | mrt->maxvif = tmp + 1; |
| 814 | } |
| 815 | |
| 816 | write_unlock_bh(&mrt_lock); |
| 817 | |
| 818 | dev_set_allmulti(dev, -1); |
| 819 | |
| 820 | in6_dev = __in6_dev_get(dev); |
| 821 | if (in6_dev) { |
| 822 | in6_dev->cnf.mc_forwarding--; |
| 823 | inet6_netconf_notify_devconf(dev_net(dev), |
| 824 | NETCONFA_MC_FORWARDING, |
| 825 | dev->ifindex, &in6_dev->cnf); |
| 826 | } |
| 827 | |
| 828 | if (v->flags & MIFF_REGISTER) |
| 829 | unregister_netdevice_queue(dev, head); |
| 830 | |
| 831 | dev_put(dev); |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
| 836 | { |
| 837 | kmem_cache_free(mrt_cachep, c); |
| 838 | } |
| 839 | |
| 840 | /* Destroy an unresolved cache entry, killing queued skbs |
| 841 | and reporting error to netlink readers. |
| 842 | */ |
| 843 | |
| 844 | static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c) |
| 845 | { |
| 846 | struct net *net = read_pnet(&mrt->net); |
| 847 | struct sk_buff *skb; |
| 848 | |
| 849 | atomic_dec(&mrt->cache_resolve_queue_len); |
| 850 | |
| 851 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { |
| 852 | if (ipv6_hdr(skb)->version == 0) { |
| 853 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
| 854 | nlh->nlmsg_type = NLMSG_ERROR; |
| 855 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
| 856 | skb_trim(skb, nlh->nlmsg_len); |
| 857 | ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT; |
| 858 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
| 859 | } else |
| 860 | kfree_skb(skb); |
| 861 | } |
| 862 | |
| 863 | ip6mr_cache_free(c); |
| 864 | } |
| 865 | |
| 866 | |
| 867 | /* Timer process for all the unresolved queue. */ |
| 868 | |
| 869 | static void ipmr_do_expire_process(struct mr6_table *mrt) |
| 870 | { |
| 871 | unsigned long now = jiffies; |
| 872 | unsigned long expires = 10 * HZ; |
| 873 | struct mfc6_cache *c, *next; |
| 874 | |
| 875 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
| 876 | if (time_after(c->mfc_un.unres.expires, now)) { |
| 877 | /* not yet... */ |
| 878 | unsigned long interval = c->mfc_un.unres.expires - now; |
| 879 | if (interval < expires) |
| 880 | expires = interval; |
| 881 | continue; |
| 882 | } |
| 883 | |
| 884 | list_del(&c->list); |
| 885 | mr6_netlink_event(mrt, c, RTM_DELROUTE); |
| 886 | ip6mr_destroy_unres(mrt, c); |
| 887 | } |
| 888 | |
| 889 | if (!list_empty(&mrt->mfc6_unres_queue)) |
| 890 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); |
| 891 | } |
| 892 | |
| 893 | static void ipmr_expire_process(unsigned long arg) |
| 894 | { |
| 895 | struct mr6_table *mrt = (struct mr6_table *)arg; |
| 896 | |
| 897 | if (!spin_trylock(&mfc_unres_lock)) { |
| 898 | mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); |
| 899 | return; |
| 900 | } |
| 901 | |
| 902 | if (!list_empty(&mrt->mfc6_unres_queue)) |
| 903 | ipmr_do_expire_process(mrt); |
| 904 | |
| 905 | spin_unlock(&mfc_unres_lock); |
| 906 | } |
| 907 | |
| 908 | /* Fill oifs list. It is called under write locked mrt_lock. */ |
| 909 | |
| 910 | static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache, |
| 911 | unsigned char *ttls) |
| 912 | { |
| 913 | int vifi; |
| 914 | |
| 915 | cache->mfc_un.res.minvif = MAXMIFS; |
| 916 | cache->mfc_un.res.maxvif = 0; |
| 917 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
| 918 | |
| 919 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
| 920 | if (MIF_EXISTS(mrt, vifi) && |
| 921 | ttls[vifi] && ttls[vifi] < 255) { |
| 922 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
| 923 | if (cache->mfc_un.res.minvif > vifi) |
| 924 | cache->mfc_un.res.minvif = vifi; |
| 925 | if (cache->mfc_un.res.maxvif <= vifi) |
| 926 | cache->mfc_un.res.maxvif = vifi + 1; |
| 927 | } |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | static int mif6_add(struct net *net, struct mr6_table *mrt, |
| 932 | struct mif6ctl *vifc, int mrtsock) |
| 933 | { |
| 934 | int vifi = vifc->mif6c_mifi; |
| 935 | struct mif_device *v = &mrt->vif6_table[vifi]; |
| 936 | struct net_device *dev; |
| 937 | struct inet6_dev *in6_dev; |
| 938 | int err; |
| 939 | |
| 940 | /* Is vif busy ? */ |
| 941 | if (MIF_EXISTS(mrt, vifi)) |
| 942 | return -EADDRINUSE; |
| 943 | |
| 944 | switch (vifc->mif6c_flags) { |
| 945 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 946 | case MIFF_REGISTER: |
| 947 | /* |
| 948 | * Special Purpose VIF in PIM |
| 949 | * All the packets will be sent to the daemon |
| 950 | */ |
| 951 | if (mrt->mroute_reg_vif_num >= 0) |
| 952 | return -EADDRINUSE; |
| 953 | dev = ip6mr_reg_vif(net, mrt); |
| 954 | if (!dev) |
| 955 | return -ENOBUFS; |
| 956 | err = dev_set_allmulti(dev, 1); |
| 957 | if (err) { |
| 958 | unregister_netdevice(dev); |
| 959 | dev_put(dev); |
| 960 | return err; |
| 961 | } |
| 962 | break; |
| 963 | #endif |
| 964 | case 0: |
| 965 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
| 966 | if (!dev) |
| 967 | return -EADDRNOTAVAIL; |
| 968 | err = dev_set_allmulti(dev, 1); |
| 969 | if (err) { |
| 970 | dev_put(dev); |
| 971 | return err; |
| 972 | } |
| 973 | break; |
| 974 | default: |
| 975 | return -EINVAL; |
| 976 | } |
| 977 | |
| 978 | in6_dev = __in6_dev_get(dev); |
| 979 | if (in6_dev) { |
| 980 | in6_dev->cnf.mc_forwarding++; |
| 981 | inet6_netconf_notify_devconf(dev_net(dev), |
| 982 | NETCONFA_MC_FORWARDING, |
| 983 | dev->ifindex, &in6_dev->cnf); |
| 984 | } |
| 985 | |
| 986 | /* |
| 987 | * Fill in the VIF structures |
| 988 | */ |
| 989 | v->rate_limit = vifc->vifc_rate_limit; |
| 990 | v->flags = vifc->mif6c_flags; |
| 991 | if (!mrtsock) |
| 992 | v->flags |= VIFF_STATIC; |
| 993 | v->threshold = vifc->vifc_threshold; |
| 994 | v->bytes_in = 0; |
| 995 | v->bytes_out = 0; |
| 996 | v->pkt_in = 0; |
| 997 | v->pkt_out = 0; |
| 998 | v->link = dev->ifindex; |
| 999 | if (v->flags & MIFF_REGISTER) |
| 1000 | v->link = dev_get_iflink(dev); |
| 1001 | |
| 1002 | /* And finish update writing critical data */ |
| 1003 | write_lock_bh(&mrt_lock); |
| 1004 | v->dev = dev; |
| 1005 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1006 | if (v->flags & MIFF_REGISTER) |
| 1007 | mrt->mroute_reg_vif_num = vifi; |
| 1008 | #endif |
| 1009 | if (vifi + 1 > mrt->maxvif) |
| 1010 | mrt->maxvif = vifi + 1; |
| 1011 | write_unlock_bh(&mrt_lock); |
| 1012 | return 0; |
| 1013 | } |
| 1014 | |
| 1015 | static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt, |
| 1016 | const struct in6_addr *origin, |
| 1017 | const struct in6_addr *mcastgrp) |
| 1018 | { |
| 1019 | int line = MFC6_HASH(mcastgrp, origin); |
| 1020 | struct mfc6_cache *c; |
| 1021 | |
| 1022 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
| 1023 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
| 1024 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) |
| 1025 | return c; |
| 1026 | } |
| 1027 | return NULL; |
| 1028 | } |
| 1029 | |
| 1030 | /* Look for a (*,*,oif) entry */ |
| 1031 | static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt, |
| 1032 | mifi_t mifi) |
| 1033 | { |
| 1034 | int line = MFC6_HASH(&in6addr_any, &in6addr_any); |
| 1035 | struct mfc6_cache *c; |
| 1036 | |
| 1037 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) |
| 1038 | if (ipv6_addr_any(&c->mf6c_origin) && |
| 1039 | ipv6_addr_any(&c->mf6c_mcastgrp) && |
| 1040 | (c->mfc_un.res.ttls[mifi] < 255)) |
| 1041 | return c; |
| 1042 | |
| 1043 | return NULL; |
| 1044 | } |
| 1045 | |
| 1046 | /* Look for a (*,G) entry */ |
| 1047 | static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt, |
| 1048 | struct in6_addr *mcastgrp, |
| 1049 | mifi_t mifi) |
| 1050 | { |
| 1051 | int line = MFC6_HASH(mcastgrp, &in6addr_any); |
| 1052 | struct mfc6_cache *c, *proxy; |
| 1053 | |
| 1054 | if (ipv6_addr_any(mcastgrp)) |
| 1055 | goto skip; |
| 1056 | |
| 1057 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) |
| 1058 | if (ipv6_addr_any(&c->mf6c_origin) && |
| 1059 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) { |
| 1060 | if (c->mfc_un.res.ttls[mifi] < 255) |
| 1061 | return c; |
| 1062 | |
| 1063 | /* It's ok if the mifi is part of the static tree */ |
| 1064 | proxy = ip6mr_cache_find_any_parent(mrt, |
| 1065 | c->mf6c_parent); |
| 1066 | if (proxy && proxy->mfc_un.res.ttls[mifi] < 255) |
| 1067 | return c; |
| 1068 | } |
| 1069 | |
| 1070 | skip: |
| 1071 | return ip6mr_cache_find_any_parent(mrt, mifi); |
| 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * Allocate a multicast cache entry |
| 1076 | */ |
| 1077 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
| 1078 | { |
| 1079 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
| 1080 | if (!c) |
| 1081 | return NULL; |
| 1082 | c->mfc_un.res.minvif = MAXMIFS; |
| 1083 | return c; |
| 1084 | } |
| 1085 | |
| 1086 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
| 1087 | { |
| 1088 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
| 1089 | if (!c) |
| 1090 | return NULL; |
| 1091 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
| 1092 | c->mfc_un.unres.expires = jiffies + 10 * HZ; |
| 1093 | return c; |
| 1094 | } |
| 1095 | |
| 1096 | /* |
| 1097 | * A cache entry has gone into a resolved state from queued |
| 1098 | */ |
| 1099 | |
| 1100 | static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt, |
| 1101 | struct mfc6_cache *uc, struct mfc6_cache *c) |
| 1102 | { |
| 1103 | struct sk_buff *skb; |
| 1104 | |
| 1105 | /* |
| 1106 | * Play the pending entries through our router |
| 1107 | */ |
| 1108 | |
| 1109 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
| 1110 | if (ipv6_hdr(skb)->version == 0) { |
| 1111 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
| 1112 | |
| 1113 | if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
| 1114 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
| 1115 | } else { |
| 1116 | nlh->nlmsg_type = NLMSG_ERROR; |
| 1117 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
| 1118 | skb_trim(skb, nlh->nlmsg_len); |
| 1119 | ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE; |
| 1120 | } |
| 1121 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
| 1122 | } else |
| 1123 | ip6_mr_forward(net, mrt, skb, c); |
| 1124 | } |
| 1125 | } |
| 1126 | |
| 1127 | /* |
| 1128 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd |
| 1129 | * expects the following bizarre scheme. |
| 1130 | * |
| 1131 | * Called under mrt_lock. |
| 1132 | */ |
| 1133 | |
| 1134 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, |
| 1135 | mifi_t mifi, int assert) |
| 1136 | { |
| 1137 | struct sk_buff *skb; |
| 1138 | struct mrt6msg *msg; |
| 1139 | int ret; |
| 1140 | |
| 1141 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1142 | if (assert == MRT6MSG_WHOLEPKT) |
| 1143 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) |
| 1144 | +sizeof(*msg)); |
| 1145 | else |
| 1146 | #endif |
| 1147 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); |
| 1148 | |
| 1149 | if (!skb) |
| 1150 | return -ENOBUFS; |
| 1151 | |
| 1152 | /* I suppose that internal messages |
| 1153 | * do not require checksums */ |
| 1154 | |
| 1155 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1156 | |
| 1157 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1158 | if (assert == MRT6MSG_WHOLEPKT) { |
| 1159 | /* Ugly, but we have no choice with this interface. |
| 1160 | Duplicate old header, fix length etc. |
| 1161 | And all this only to mangle msg->im6_msgtype and |
| 1162 | to set msg->im6_mbz to "mbz" :-) |
| 1163 | */ |
| 1164 | skb_push(skb, -skb_network_offset(pkt)); |
| 1165 | |
| 1166 | skb_push(skb, sizeof(*msg)); |
| 1167 | skb_reset_transport_header(skb); |
| 1168 | msg = (struct mrt6msg *)skb_transport_header(skb); |
| 1169 | msg->im6_mbz = 0; |
| 1170 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; |
| 1171 | msg->im6_mif = mrt->mroute_reg_vif_num; |
| 1172 | msg->im6_pad = 0; |
| 1173 | msg->im6_src = ipv6_hdr(pkt)->saddr; |
| 1174 | msg->im6_dst = ipv6_hdr(pkt)->daddr; |
| 1175 | |
| 1176 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1177 | } else |
| 1178 | #endif |
| 1179 | { |
| 1180 | /* |
| 1181 | * Copy the IP header |
| 1182 | */ |
| 1183 | |
| 1184 | skb_put(skb, sizeof(struct ipv6hdr)); |
| 1185 | skb_reset_network_header(skb); |
| 1186 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); |
| 1187 | |
| 1188 | /* |
| 1189 | * Add our header |
| 1190 | */ |
| 1191 | skb_put(skb, sizeof(*msg)); |
| 1192 | skb_reset_transport_header(skb); |
| 1193 | msg = (struct mrt6msg *)skb_transport_header(skb); |
| 1194 | |
| 1195 | msg->im6_mbz = 0; |
| 1196 | msg->im6_msgtype = assert; |
| 1197 | msg->im6_mif = mifi; |
| 1198 | msg->im6_pad = 0; |
| 1199 | msg->im6_src = ipv6_hdr(pkt)->saddr; |
| 1200 | msg->im6_dst = ipv6_hdr(pkt)->daddr; |
| 1201 | |
| 1202 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
| 1203 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1204 | } |
| 1205 | |
| 1206 | if (!mrt->mroute6_sk) { |
| 1207 | kfree_skb(skb); |
| 1208 | return -EINVAL; |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * Deliver to user space multicast routing algorithms |
| 1213 | */ |
| 1214 | ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb); |
| 1215 | if (ret < 0) { |
| 1216 | net_warn_ratelimited("mroute6: pending queue full, dropping entries\n"); |
| 1217 | kfree_skb(skb); |
| 1218 | } |
| 1219 | |
| 1220 | return ret; |
| 1221 | } |
| 1222 | |
| 1223 | /* |
| 1224 | * Queue a packet for resolution. It gets locked cache entry! |
| 1225 | */ |
| 1226 | |
| 1227 | static int |
| 1228 | ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb) |
| 1229 | { |
| 1230 | bool found = false; |
| 1231 | int err; |
| 1232 | struct mfc6_cache *c; |
| 1233 | |
| 1234 | spin_lock_bh(&mfc_unres_lock); |
| 1235 | list_for_each_entry(c, &mrt->mfc6_unres_queue, list) { |
| 1236 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
| 1237 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { |
| 1238 | found = true; |
| 1239 | break; |
| 1240 | } |
| 1241 | } |
| 1242 | |
| 1243 | if (!found) { |
| 1244 | /* |
| 1245 | * Create a new entry if allowable |
| 1246 | */ |
| 1247 | |
| 1248 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
| 1249 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
| 1250 | spin_unlock_bh(&mfc_unres_lock); |
| 1251 | |
| 1252 | kfree_skb(skb); |
| 1253 | return -ENOBUFS; |
| 1254 | } |
| 1255 | |
| 1256 | /* |
| 1257 | * Fill in the new cache entry |
| 1258 | */ |
| 1259 | c->mf6c_parent = -1; |
| 1260 | c->mf6c_origin = ipv6_hdr(skb)->saddr; |
| 1261 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; |
| 1262 | |
| 1263 | /* |
| 1264 | * Reflect first query at pim6sd |
| 1265 | */ |
| 1266 | err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); |
| 1267 | if (err < 0) { |
| 1268 | /* If the report failed throw the cache entry |
| 1269 | out - Brad Parker |
| 1270 | */ |
| 1271 | spin_unlock_bh(&mfc_unres_lock); |
| 1272 | |
| 1273 | ip6mr_cache_free(c); |
| 1274 | kfree_skb(skb); |
| 1275 | return err; |
| 1276 | } |
| 1277 | |
| 1278 | atomic_inc(&mrt->cache_resolve_queue_len); |
| 1279 | list_add(&c->list, &mrt->mfc6_unres_queue); |
| 1280 | mr6_netlink_event(mrt, c, RTM_NEWROUTE); |
| 1281 | |
| 1282 | ipmr_do_expire_process(mrt); |
| 1283 | } |
| 1284 | |
| 1285 | /* |
| 1286 | * See if we can append the packet |
| 1287 | */ |
| 1288 | if (c->mfc_un.unres.unresolved.qlen > 3) { |
| 1289 | kfree_skb(skb); |
| 1290 | err = -ENOBUFS; |
| 1291 | } else { |
| 1292 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
| 1293 | err = 0; |
| 1294 | } |
| 1295 | |
| 1296 | spin_unlock_bh(&mfc_unres_lock); |
| 1297 | return err; |
| 1298 | } |
| 1299 | |
| 1300 | /* |
| 1301 | * MFC6 cache manipulation by user space |
| 1302 | */ |
| 1303 | |
| 1304 | static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc, |
| 1305 | int parent) |
| 1306 | { |
| 1307 | int line; |
| 1308 | struct mfc6_cache *c, *next; |
| 1309 | |
| 1310 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); |
| 1311 | |
| 1312 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) { |
| 1313 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
| 1314 | ipv6_addr_equal(&c->mf6c_mcastgrp, |
| 1315 | &mfc->mf6cc_mcastgrp.sin6_addr) && |
| 1316 | (parent == -1 || parent == c->mf6c_parent)) { |
| 1317 | write_lock_bh(&mrt_lock); |
| 1318 | list_del(&c->list); |
| 1319 | write_unlock_bh(&mrt_lock); |
| 1320 | |
| 1321 | mr6_netlink_event(mrt, c, RTM_DELROUTE); |
| 1322 | ip6mr_cache_free(c); |
| 1323 | return 0; |
| 1324 | } |
| 1325 | } |
| 1326 | return -ENOENT; |
| 1327 | } |
| 1328 | |
| 1329 | static int ip6mr_device_event(struct notifier_block *this, |
| 1330 | unsigned long event, void *ptr) |
| 1331 | { |
| 1332 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 1333 | struct net *net = dev_net(dev); |
| 1334 | struct mr6_table *mrt; |
| 1335 | struct mif_device *v; |
| 1336 | int ct; |
| 1337 | LIST_HEAD(list); |
| 1338 | |
| 1339 | if (event != NETDEV_UNREGISTER) |
| 1340 | return NOTIFY_DONE; |
| 1341 | |
| 1342 | ip6mr_for_each_table(mrt, net) { |
| 1343 | v = &mrt->vif6_table[0]; |
| 1344 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { |
| 1345 | if (v->dev == dev) |
| 1346 | mif6_delete(mrt, ct, &list); |
| 1347 | } |
| 1348 | } |
| 1349 | unregister_netdevice_many(&list); |
| 1350 | |
| 1351 | return NOTIFY_DONE; |
| 1352 | } |
| 1353 | |
| 1354 | static struct notifier_block ip6_mr_notifier = { |
| 1355 | .notifier_call = ip6mr_device_event |
| 1356 | }; |
| 1357 | |
| 1358 | /* |
| 1359 | * Setup for IP multicast routing |
| 1360 | */ |
| 1361 | |
| 1362 | static int __net_init ip6mr_net_init(struct net *net) |
| 1363 | { |
| 1364 | int err; |
| 1365 | |
| 1366 | err = ip6mr_rules_init(net); |
| 1367 | if (err < 0) |
| 1368 | goto fail; |
| 1369 | |
| 1370 | #ifdef CONFIG_PROC_FS |
| 1371 | err = -ENOMEM; |
| 1372 | if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops)) |
| 1373 | goto proc_vif_fail; |
| 1374 | if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops)) |
| 1375 | goto proc_cache_fail; |
| 1376 | #endif |
| 1377 | |
| 1378 | return 0; |
| 1379 | |
| 1380 | #ifdef CONFIG_PROC_FS |
| 1381 | proc_cache_fail: |
| 1382 | remove_proc_entry("ip6_mr_vif", net->proc_net); |
| 1383 | proc_vif_fail: |
| 1384 | ip6mr_rules_exit(net); |
| 1385 | #endif |
| 1386 | fail: |
| 1387 | return err; |
| 1388 | } |
| 1389 | |
| 1390 | static void __net_exit ip6mr_net_exit(struct net *net) |
| 1391 | { |
| 1392 | #ifdef CONFIG_PROC_FS |
| 1393 | remove_proc_entry("ip6_mr_cache", net->proc_net); |
| 1394 | remove_proc_entry("ip6_mr_vif", net->proc_net); |
| 1395 | #endif |
| 1396 | ip6mr_rules_exit(net); |
| 1397 | } |
| 1398 | |
| 1399 | static struct pernet_operations ip6mr_net_ops = { |
| 1400 | .init = ip6mr_net_init, |
| 1401 | .exit = ip6mr_net_exit, |
| 1402 | }; |
| 1403 | |
| 1404 | int __init ip6_mr_init(void) |
| 1405 | { |
| 1406 | int err; |
| 1407 | |
| 1408 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
| 1409 | sizeof(struct mfc6_cache), |
| 1410 | 0, SLAB_HWCACHE_ALIGN, |
| 1411 | NULL); |
| 1412 | if (!mrt_cachep) |
| 1413 | return -ENOMEM; |
| 1414 | |
| 1415 | err = register_pernet_subsys(&ip6mr_net_ops); |
| 1416 | if (err) |
| 1417 | goto reg_pernet_fail; |
| 1418 | |
| 1419 | err = register_netdevice_notifier(&ip6_mr_notifier); |
| 1420 | if (err) |
| 1421 | goto reg_notif_fail; |
| 1422 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1423 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { |
| 1424 | pr_err("%s: can't add PIM protocol\n", __func__); |
| 1425 | err = -EAGAIN; |
| 1426 | goto add_proto_fail; |
| 1427 | } |
| 1428 | #endif |
| 1429 | rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL, |
| 1430 | ip6mr_rtm_dumproute, NULL); |
| 1431 | return 0; |
| 1432 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1433 | add_proto_fail: |
| 1434 | unregister_netdevice_notifier(&ip6_mr_notifier); |
| 1435 | #endif |
| 1436 | reg_notif_fail: |
| 1437 | unregister_pernet_subsys(&ip6mr_net_ops); |
| 1438 | reg_pernet_fail: |
| 1439 | kmem_cache_destroy(mrt_cachep); |
| 1440 | return err; |
| 1441 | } |
| 1442 | |
| 1443 | void ip6_mr_cleanup(void) |
| 1444 | { |
| 1445 | rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE); |
| 1446 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1447 | inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); |
| 1448 | #endif |
| 1449 | unregister_netdevice_notifier(&ip6_mr_notifier); |
| 1450 | unregister_pernet_subsys(&ip6mr_net_ops); |
| 1451 | kmem_cache_destroy(mrt_cachep); |
| 1452 | } |
| 1453 | |
| 1454 | static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, |
| 1455 | struct mf6cctl *mfc, int mrtsock, int parent) |
| 1456 | { |
| 1457 | bool found = false; |
| 1458 | int line; |
| 1459 | struct mfc6_cache *uc, *c; |
| 1460 | unsigned char ttls[MAXMIFS]; |
| 1461 | int i; |
| 1462 | |
| 1463 | if (mfc->mf6cc_parent >= MAXMIFS) |
| 1464 | return -ENFILE; |
| 1465 | |
| 1466 | memset(ttls, 255, MAXMIFS); |
| 1467 | for (i = 0; i < MAXMIFS; i++) { |
| 1468 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
| 1469 | ttls[i] = 1; |
| 1470 | |
| 1471 | } |
| 1472 | |
| 1473 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); |
| 1474 | |
| 1475 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
| 1476 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
| 1477 | ipv6_addr_equal(&c->mf6c_mcastgrp, |
| 1478 | &mfc->mf6cc_mcastgrp.sin6_addr) && |
| 1479 | (parent == -1 || parent == mfc->mf6cc_parent)) { |
| 1480 | found = true; |
| 1481 | break; |
| 1482 | } |
| 1483 | } |
| 1484 | |
| 1485 | if (found) { |
| 1486 | write_lock_bh(&mrt_lock); |
| 1487 | c->mf6c_parent = mfc->mf6cc_parent; |
| 1488 | ip6mr_update_thresholds(mrt, c, ttls); |
| 1489 | if (!mrtsock) |
| 1490 | c->mfc_flags |= MFC_STATIC; |
| 1491 | write_unlock_bh(&mrt_lock); |
| 1492 | mr6_netlink_event(mrt, c, RTM_NEWROUTE); |
| 1493 | return 0; |
| 1494 | } |
| 1495 | |
| 1496 | if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) && |
| 1497 | !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) |
| 1498 | return -EINVAL; |
| 1499 | |
| 1500 | c = ip6mr_cache_alloc(); |
| 1501 | if (!c) |
| 1502 | return -ENOMEM; |
| 1503 | |
| 1504 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; |
| 1505 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; |
| 1506 | c->mf6c_parent = mfc->mf6cc_parent; |
| 1507 | ip6mr_update_thresholds(mrt, c, ttls); |
| 1508 | if (!mrtsock) |
| 1509 | c->mfc_flags |= MFC_STATIC; |
| 1510 | |
| 1511 | write_lock_bh(&mrt_lock); |
| 1512 | list_add(&c->list, &mrt->mfc6_cache_array[line]); |
| 1513 | write_unlock_bh(&mrt_lock); |
| 1514 | |
| 1515 | /* |
| 1516 | * Check to see if we resolved a queued list. If so we |
| 1517 | * need to send on the frames and tidy up. |
| 1518 | */ |
| 1519 | found = false; |
| 1520 | spin_lock_bh(&mfc_unres_lock); |
| 1521 | list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) { |
| 1522 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
| 1523 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
| 1524 | list_del(&uc->list); |
| 1525 | atomic_dec(&mrt->cache_resolve_queue_len); |
| 1526 | found = true; |
| 1527 | break; |
| 1528 | } |
| 1529 | } |
| 1530 | if (list_empty(&mrt->mfc6_unres_queue)) |
| 1531 | del_timer(&mrt->ipmr_expire_timer); |
| 1532 | spin_unlock_bh(&mfc_unres_lock); |
| 1533 | |
| 1534 | if (found) { |
| 1535 | ip6mr_cache_resolve(net, mrt, uc, c); |
| 1536 | ip6mr_cache_free(uc); |
| 1537 | } |
| 1538 | mr6_netlink_event(mrt, c, RTM_NEWROUTE); |
| 1539 | return 0; |
| 1540 | } |
| 1541 | |
| 1542 | /* |
| 1543 | * Close the multicast socket, and clear the vif tables etc |
| 1544 | */ |
| 1545 | |
| 1546 | static void mroute_clean_tables(struct mr6_table *mrt) |
| 1547 | { |
| 1548 | int i; |
| 1549 | LIST_HEAD(list); |
| 1550 | struct mfc6_cache *c, *next; |
| 1551 | |
| 1552 | /* |
| 1553 | * Shut down all active vif entries |
| 1554 | */ |
| 1555 | for (i = 0; i < mrt->maxvif; i++) { |
| 1556 | if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) |
| 1557 | mif6_delete(mrt, i, &list); |
| 1558 | } |
| 1559 | unregister_netdevice_many(&list); |
| 1560 | |
| 1561 | /* |
| 1562 | * Wipe the cache |
| 1563 | */ |
| 1564 | for (i = 0; i < MFC6_LINES; i++) { |
| 1565 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { |
| 1566 | if (c->mfc_flags & MFC_STATIC) |
| 1567 | continue; |
| 1568 | write_lock_bh(&mrt_lock); |
| 1569 | list_del(&c->list); |
| 1570 | write_unlock_bh(&mrt_lock); |
| 1571 | |
| 1572 | mr6_netlink_event(mrt, c, RTM_DELROUTE); |
| 1573 | ip6mr_cache_free(c); |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
| 1578 | spin_lock_bh(&mfc_unres_lock); |
| 1579 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
| 1580 | list_del(&c->list); |
| 1581 | mr6_netlink_event(mrt, c, RTM_DELROUTE); |
| 1582 | ip6mr_destroy_unres(mrt, c); |
| 1583 | } |
| 1584 | spin_unlock_bh(&mfc_unres_lock); |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk) |
| 1589 | { |
| 1590 | int err = 0; |
| 1591 | struct net *net = sock_net(sk); |
| 1592 | |
| 1593 | rtnl_lock(); |
| 1594 | write_lock_bh(&mrt_lock); |
| 1595 | if (likely(mrt->mroute6_sk == NULL)) { |
| 1596 | mrt->mroute6_sk = sk; |
| 1597 | net->ipv6.devconf_all->mc_forwarding++; |
| 1598 | inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
| 1599 | NETCONFA_IFINDEX_ALL, |
| 1600 | net->ipv6.devconf_all); |
| 1601 | } |
| 1602 | else |
| 1603 | err = -EADDRINUSE; |
| 1604 | write_unlock_bh(&mrt_lock); |
| 1605 | |
| 1606 | rtnl_unlock(); |
| 1607 | |
| 1608 | return err; |
| 1609 | } |
| 1610 | |
| 1611 | int ip6mr_sk_done(struct sock *sk) |
| 1612 | { |
| 1613 | int err = -EACCES; |
| 1614 | struct net *net = sock_net(sk); |
| 1615 | struct mr6_table *mrt; |
| 1616 | |
| 1617 | rtnl_lock(); |
| 1618 | ip6mr_for_each_table(mrt, net) { |
| 1619 | if (sk == mrt->mroute6_sk) { |
| 1620 | write_lock_bh(&mrt_lock); |
| 1621 | mrt->mroute6_sk = NULL; |
| 1622 | net->ipv6.devconf_all->mc_forwarding--; |
| 1623 | inet6_netconf_notify_devconf(net, |
| 1624 | NETCONFA_MC_FORWARDING, |
| 1625 | NETCONFA_IFINDEX_ALL, |
| 1626 | net->ipv6.devconf_all); |
| 1627 | write_unlock_bh(&mrt_lock); |
| 1628 | |
| 1629 | mroute_clean_tables(mrt); |
| 1630 | err = 0; |
| 1631 | break; |
| 1632 | } |
| 1633 | } |
| 1634 | rtnl_unlock(); |
| 1635 | |
| 1636 | return err; |
| 1637 | } |
| 1638 | |
| 1639 | struct sock *mroute6_socket(struct net *net, struct sk_buff *skb) |
| 1640 | { |
| 1641 | struct mr6_table *mrt; |
| 1642 | struct flowi6 fl6 = { |
| 1643 | .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
| 1644 | .flowi6_oif = skb->dev->ifindex, |
| 1645 | .flowi6_mark = skb->mark, |
| 1646 | }; |
| 1647 | |
| 1648 | if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
| 1649 | return NULL; |
| 1650 | |
| 1651 | return mrt->mroute6_sk; |
| 1652 | } |
| 1653 | |
| 1654 | /* |
| 1655 | * Socket options and virtual interface manipulation. The whole |
| 1656 | * virtual interface system is a complete heap, but unfortunately |
| 1657 | * that's how BSD mrouted happens to think. Maybe one day with a proper |
| 1658 | * MOSPF/PIM router set up we can clean this up. |
| 1659 | */ |
| 1660 | |
| 1661 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
| 1662 | { |
| 1663 | int ret, parent = 0; |
| 1664 | struct mif6ctl vif; |
| 1665 | struct mf6cctl mfc; |
| 1666 | mifi_t mifi; |
| 1667 | struct net *net = sock_net(sk); |
| 1668 | struct mr6_table *mrt; |
| 1669 | |
| 1670 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| 1671 | if (!mrt) |
| 1672 | return -ENOENT; |
| 1673 | |
| 1674 | if (optname != MRT6_INIT) { |
| 1675 | if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| 1676 | return -EACCES; |
| 1677 | } |
| 1678 | |
| 1679 | switch (optname) { |
| 1680 | case MRT6_INIT: |
| 1681 | if (sk->sk_type != SOCK_RAW || |
| 1682 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
| 1683 | return -EOPNOTSUPP; |
| 1684 | if (optlen < sizeof(int)) |
| 1685 | return -EINVAL; |
| 1686 | |
| 1687 | return ip6mr_sk_init(mrt, sk); |
| 1688 | |
| 1689 | case MRT6_DONE: |
| 1690 | return ip6mr_sk_done(sk); |
| 1691 | |
| 1692 | case MRT6_ADD_MIF: |
| 1693 | if (optlen < sizeof(vif)) |
| 1694 | return -EINVAL; |
| 1695 | if (copy_from_user(&vif, optval, sizeof(vif))) |
| 1696 | return -EFAULT; |
| 1697 | if (vif.mif6c_mifi >= MAXMIFS) |
| 1698 | return -ENFILE; |
| 1699 | rtnl_lock(); |
| 1700 | ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk); |
| 1701 | rtnl_unlock(); |
| 1702 | return ret; |
| 1703 | |
| 1704 | case MRT6_DEL_MIF: |
| 1705 | if (optlen < sizeof(mifi_t)) |
| 1706 | return -EINVAL; |
| 1707 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) |
| 1708 | return -EFAULT; |
| 1709 | rtnl_lock(); |
| 1710 | ret = mif6_delete(mrt, mifi, NULL); |
| 1711 | rtnl_unlock(); |
| 1712 | return ret; |
| 1713 | |
| 1714 | /* |
| 1715 | * Manipulate the forwarding caches. These live |
| 1716 | * in a sort of kernel/user symbiosis. |
| 1717 | */ |
| 1718 | case MRT6_ADD_MFC: |
| 1719 | case MRT6_DEL_MFC: |
| 1720 | parent = -1; |
| 1721 | case MRT6_ADD_MFC_PROXY: |
| 1722 | case MRT6_DEL_MFC_PROXY: |
| 1723 | if (optlen < sizeof(mfc)) |
| 1724 | return -EINVAL; |
| 1725 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
| 1726 | return -EFAULT; |
| 1727 | if (parent == 0) |
| 1728 | parent = mfc.mf6cc_parent; |
| 1729 | rtnl_lock(); |
| 1730 | if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY) |
| 1731 | ret = ip6mr_mfc_delete(mrt, &mfc, parent); |
| 1732 | else |
| 1733 | ret = ip6mr_mfc_add(net, mrt, &mfc, |
| 1734 | sk == mrt->mroute6_sk, parent); |
| 1735 | rtnl_unlock(); |
| 1736 | return ret; |
| 1737 | |
| 1738 | /* |
| 1739 | * Control PIM assert (to activate pim will activate assert) |
| 1740 | */ |
| 1741 | case MRT6_ASSERT: |
| 1742 | { |
| 1743 | int v; |
| 1744 | |
| 1745 | if (optlen != sizeof(v)) |
| 1746 | return -EINVAL; |
| 1747 | if (get_user(v, (int __user *)optval)) |
| 1748 | return -EFAULT; |
| 1749 | mrt->mroute_do_assert = v; |
| 1750 | return 0; |
| 1751 | } |
| 1752 | |
| 1753 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1754 | case MRT6_PIM: |
| 1755 | { |
| 1756 | int v; |
| 1757 | |
| 1758 | if (optlen != sizeof(v)) |
| 1759 | return -EINVAL; |
| 1760 | if (get_user(v, (int __user *)optval)) |
| 1761 | return -EFAULT; |
| 1762 | v = !!v; |
| 1763 | rtnl_lock(); |
| 1764 | ret = 0; |
| 1765 | if (v != mrt->mroute_do_pim) { |
| 1766 | mrt->mroute_do_pim = v; |
| 1767 | mrt->mroute_do_assert = v; |
| 1768 | } |
| 1769 | rtnl_unlock(); |
| 1770 | return ret; |
| 1771 | } |
| 1772 | |
| 1773 | #endif |
| 1774 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES |
| 1775 | case MRT6_TABLE: |
| 1776 | { |
| 1777 | u32 v; |
| 1778 | |
| 1779 | if (optlen != sizeof(u32)) |
| 1780 | return -EINVAL; |
| 1781 | if (get_user(v, (u32 __user *)optval)) |
| 1782 | return -EFAULT; |
| 1783 | /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
| 1784 | if (v != RT_TABLE_DEFAULT && v >= 100000000) |
| 1785 | return -EINVAL; |
| 1786 | if (sk == mrt->mroute6_sk) |
| 1787 | return -EBUSY; |
| 1788 | |
| 1789 | rtnl_lock(); |
| 1790 | ret = 0; |
| 1791 | if (!ip6mr_new_table(net, v)) |
| 1792 | ret = -ENOMEM; |
| 1793 | raw6_sk(sk)->ip6mr_table = v; |
| 1794 | rtnl_unlock(); |
| 1795 | return ret; |
| 1796 | } |
| 1797 | #endif |
| 1798 | /* |
| 1799 | * Spurious command, or MRT6_VERSION which you cannot |
| 1800 | * set. |
| 1801 | */ |
| 1802 | default: |
| 1803 | return -ENOPROTOOPT; |
| 1804 | } |
| 1805 | } |
| 1806 | |
| 1807 | /* |
| 1808 | * Getsock opt support for the multicast routing system. |
| 1809 | */ |
| 1810 | |
| 1811 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, |
| 1812 | int __user *optlen) |
| 1813 | { |
| 1814 | int olr; |
| 1815 | int val; |
| 1816 | struct net *net = sock_net(sk); |
| 1817 | struct mr6_table *mrt; |
| 1818 | |
| 1819 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| 1820 | if (!mrt) |
| 1821 | return -ENOENT; |
| 1822 | |
| 1823 | switch (optname) { |
| 1824 | case MRT6_VERSION: |
| 1825 | val = 0x0305; |
| 1826 | break; |
| 1827 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1828 | case MRT6_PIM: |
| 1829 | val = mrt->mroute_do_pim; |
| 1830 | break; |
| 1831 | #endif |
| 1832 | case MRT6_ASSERT: |
| 1833 | val = mrt->mroute_do_assert; |
| 1834 | break; |
| 1835 | default: |
| 1836 | return -ENOPROTOOPT; |
| 1837 | } |
| 1838 | |
| 1839 | if (get_user(olr, optlen)) |
| 1840 | return -EFAULT; |
| 1841 | |
| 1842 | olr = min_t(int, olr, sizeof(int)); |
| 1843 | if (olr < 0) |
| 1844 | return -EINVAL; |
| 1845 | |
| 1846 | if (put_user(olr, optlen)) |
| 1847 | return -EFAULT; |
| 1848 | if (copy_to_user(optval, &val, olr)) |
| 1849 | return -EFAULT; |
| 1850 | return 0; |
| 1851 | } |
| 1852 | |
| 1853 | /* |
| 1854 | * The IP multicast ioctl support routines. |
| 1855 | */ |
| 1856 | |
| 1857 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| 1858 | { |
| 1859 | struct sioc_sg_req6 sr; |
| 1860 | struct sioc_mif_req6 vr; |
| 1861 | struct mif_device *vif; |
| 1862 | struct mfc6_cache *c; |
| 1863 | struct net *net = sock_net(sk); |
| 1864 | struct mr6_table *mrt; |
| 1865 | |
| 1866 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| 1867 | if (!mrt) |
| 1868 | return -ENOENT; |
| 1869 | |
| 1870 | switch (cmd) { |
| 1871 | case SIOCGETMIFCNT_IN6: |
| 1872 | if (copy_from_user(&vr, arg, sizeof(vr))) |
| 1873 | return -EFAULT; |
| 1874 | if (vr.mifi >= mrt->maxvif) |
| 1875 | return -EINVAL; |
| 1876 | read_lock(&mrt_lock); |
| 1877 | vif = &mrt->vif6_table[vr.mifi]; |
| 1878 | if (MIF_EXISTS(mrt, vr.mifi)) { |
| 1879 | vr.icount = vif->pkt_in; |
| 1880 | vr.ocount = vif->pkt_out; |
| 1881 | vr.ibytes = vif->bytes_in; |
| 1882 | vr.obytes = vif->bytes_out; |
| 1883 | read_unlock(&mrt_lock); |
| 1884 | |
| 1885 | if (copy_to_user(arg, &vr, sizeof(vr))) |
| 1886 | return -EFAULT; |
| 1887 | return 0; |
| 1888 | } |
| 1889 | read_unlock(&mrt_lock); |
| 1890 | return -EADDRNOTAVAIL; |
| 1891 | case SIOCGETSGCNT_IN6: |
| 1892 | if (copy_from_user(&sr, arg, sizeof(sr))) |
| 1893 | return -EFAULT; |
| 1894 | |
| 1895 | read_lock(&mrt_lock); |
| 1896 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
| 1897 | if (c) { |
| 1898 | sr.pktcnt = c->mfc_un.res.pkt; |
| 1899 | sr.bytecnt = c->mfc_un.res.bytes; |
| 1900 | sr.wrong_if = c->mfc_un.res.wrong_if; |
| 1901 | read_unlock(&mrt_lock); |
| 1902 | |
| 1903 | if (copy_to_user(arg, &sr, sizeof(sr))) |
| 1904 | return -EFAULT; |
| 1905 | return 0; |
| 1906 | } |
| 1907 | read_unlock(&mrt_lock); |
| 1908 | return -EADDRNOTAVAIL; |
| 1909 | default: |
| 1910 | return -ENOIOCTLCMD; |
| 1911 | } |
| 1912 | } |
| 1913 | |
| 1914 | #ifdef CONFIG_COMPAT |
| 1915 | struct compat_sioc_sg_req6 { |
| 1916 | struct sockaddr_in6 src; |
| 1917 | struct sockaddr_in6 grp; |
| 1918 | compat_ulong_t pktcnt; |
| 1919 | compat_ulong_t bytecnt; |
| 1920 | compat_ulong_t wrong_if; |
| 1921 | }; |
| 1922 | |
| 1923 | struct compat_sioc_mif_req6 { |
| 1924 | mifi_t mifi; |
| 1925 | compat_ulong_t icount; |
| 1926 | compat_ulong_t ocount; |
| 1927 | compat_ulong_t ibytes; |
| 1928 | compat_ulong_t obytes; |
| 1929 | }; |
| 1930 | |
| 1931 | int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
| 1932 | { |
| 1933 | struct compat_sioc_sg_req6 sr; |
| 1934 | struct compat_sioc_mif_req6 vr; |
| 1935 | struct mif_device *vif; |
| 1936 | struct mfc6_cache *c; |
| 1937 | struct net *net = sock_net(sk); |
| 1938 | struct mr6_table *mrt; |
| 1939 | |
| 1940 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); |
| 1941 | if (!mrt) |
| 1942 | return -ENOENT; |
| 1943 | |
| 1944 | switch (cmd) { |
| 1945 | case SIOCGETMIFCNT_IN6: |
| 1946 | if (copy_from_user(&vr, arg, sizeof(vr))) |
| 1947 | return -EFAULT; |
| 1948 | if (vr.mifi >= mrt->maxvif) |
| 1949 | return -EINVAL; |
| 1950 | read_lock(&mrt_lock); |
| 1951 | vif = &mrt->vif6_table[vr.mifi]; |
| 1952 | if (MIF_EXISTS(mrt, vr.mifi)) { |
| 1953 | vr.icount = vif->pkt_in; |
| 1954 | vr.ocount = vif->pkt_out; |
| 1955 | vr.ibytes = vif->bytes_in; |
| 1956 | vr.obytes = vif->bytes_out; |
| 1957 | read_unlock(&mrt_lock); |
| 1958 | |
| 1959 | if (copy_to_user(arg, &vr, sizeof(vr))) |
| 1960 | return -EFAULT; |
| 1961 | return 0; |
| 1962 | } |
| 1963 | read_unlock(&mrt_lock); |
| 1964 | return -EADDRNOTAVAIL; |
| 1965 | case SIOCGETSGCNT_IN6: |
| 1966 | if (copy_from_user(&sr, arg, sizeof(sr))) |
| 1967 | return -EFAULT; |
| 1968 | |
| 1969 | read_lock(&mrt_lock); |
| 1970 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
| 1971 | if (c) { |
| 1972 | sr.pktcnt = c->mfc_un.res.pkt; |
| 1973 | sr.bytecnt = c->mfc_un.res.bytes; |
| 1974 | sr.wrong_if = c->mfc_un.res.wrong_if; |
| 1975 | read_unlock(&mrt_lock); |
| 1976 | |
| 1977 | if (copy_to_user(arg, &sr, sizeof(sr))) |
| 1978 | return -EFAULT; |
| 1979 | return 0; |
| 1980 | } |
| 1981 | read_unlock(&mrt_lock); |
| 1982 | return -EADDRNOTAVAIL; |
| 1983 | default: |
| 1984 | return -ENOIOCTLCMD; |
| 1985 | } |
| 1986 | } |
| 1987 | #endif |
| 1988 | |
| 1989 | static inline int ip6mr_forward2_finish(struct sock *sk, struct sk_buff *skb) |
| 1990 | { |
| 1991 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
| 1992 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
| 1993 | IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
| 1994 | IPSTATS_MIB_OUTOCTETS, skb->len); |
| 1995 | return dst_output_sk(sk, skb); |
| 1996 | } |
| 1997 | |
| 1998 | /* |
| 1999 | * Processing handlers for ip6mr_forward |
| 2000 | */ |
| 2001 | |
| 2002 | static int ip6mr_forward2(struct net *net, struct mr6_table *mrt, |
| 2003 | struct sk_buff *skb, struct mfc6_cache *c, int vifi) |
| 2004 | { |
| 2005 | struct ipv6hdr *ipv6h; |
| 2006 | struct mif_device *vif = &mrt->vif6_table[vifi]; |
| 2007 | struct net_device *dev; |
| 2008 | struct dst_entry *dst; |
| 2009 | struct flowi6 fl6; |
| 2010 | |
| 2011 | if (!vif->dev) |
| 2012 | goto out_free; |
| 2013 | |
| 2014 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 2015 | if (vif->flags & MIFF_REGISTER) { |
| 2016 | vif->pkt_out++; |
| 2017 | vif->bytes_out += skb->len; |
| 2018 | vif->dev->stats.tx_bytes += skb->len; |
| 2019 | vif->dev->stats.tx_packets++; |
| 2020 | ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); |
| 2021 | goto out_free; |
| 2022 | } |
| 2023 | #endif |
| 2024 | |
| 2025 | ipv6h = ipv6_hdr(skb); |
| 2026 | |
| 2027 | fl6 = (struct flowi6) { |
| 2028 | .flowi6_oif = vif->link, |
| 2029 | .daddr = ipv6h->daddr, |
| 2030 | }; |
| 2031 | |
| 2032 | dst = ip6_route_output(net, NULL, &fl6); |
| 2033 | if (dst->error) { |
| 2034 | dst_release(dst); |
| 2035 | goto out_free; |
| 2036 | } |
| 2037 | |
| 2038 | skb_dst_drop(skb); |
| 2039 | skb_dst_set(skb, dst); |
| 2040 | |
| 2041 | /* |
| 2042 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
| 2043 | * not only before forwarding, but after forwarding on all output |
| 2044 | * interfaces. It is clear, if mrouter runs a multicasting |
| 2045 | * program, it should receive packets not depending to what interface |
| 2046 | * program is joined. |
| 2047 | * If we will not make it, the program will have to join on all |
| 2048 | * interfaces. On the other hand, multihoming host (or router, but |
| 2049 | * not mrouter) cannot join to more than one interface - it will |
| 2050 | * result in receiving multiple packets. |
| 2051 | */ |
| 2052 | dev = vif->dev; |
| 2053 | skb->dev = dev; |
| 2054 | vif->pkt_out++; |
| 2055 | vif->bytes_out += skb->len; |
| 2056 | |
| 2057 | /* We are about to write */ |
| 2058 | /* XXX: extension headers? */ |
| 2059 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) |
| 2060 | goto out_free; |
| 2061 | |
| 2062 | ipv6h = ipv6_hdr(skb); |
| 2063 | ipv6h->hop_limit--; |
| 2064 | |
| 2065 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; |
| 2066 | |
| 2067 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, NULL, skb, |
| 2068 | skb->dev, dev, |
| 2069 | ip6mr_forward2_finish); |
| 2070 | |
| 2071 | out_free: |
| 2072 | kfree_skb(skb); |
| 2073 | return 0; |
| 2074 | } |
| 2075 | |
| 2076 | static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev) |
| 2077 | { |
| 2078 | int ct; |
| 2079 | |
| 2080 | for (ct = mrt->maxvif - 1; ct >= 0; ct--) { |
| 2081 | if (mrt->vif6_table[ct].dev == dev) |
| 2082 | break; |
| 2083 | } |
| 2084 | return ct; |
| 2085 | } |
| 2086 | |
| 2087 | static void ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
| 2088 | struct sk_buff *skb, struct mfc6_cache *cache) |
| 2089 | { |
| 2090 | int psend = -1; |
| 2091 | int vif, ct; |
| 2092 | int true_vifi = ip6mr_find_vif(mrt, skb->dev); |
| 2093 | |
| 2094 | vif = cache->mf6c_parent; |
| 2095 | cache->mfc_un.res.pkt++; |
| 2096 | cache->mfc_un.res.bytes += skb->len; |
| 2097 | |
| 2098 | if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) { |
| 2099 | struct mfc6_cache *cache_proxy; |
| 2100 | |
| 2101 | /* For an (*,G) entry, we only check that the incoming |
| 2102 | * interface is part of the static tree. |
| 2103 | */ |
| 2104 | cache_proxy = ip6mr_cache_find_any_parent(mrt, vif); |
| 2105 | if (cache_proxy && |
| 2106 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) |
| 2107 | goto forward; |
| 2108 | } |
| 2109 | |
| 2110 | /* |
| 2111 | * Wrong interface: drop packet and (maybe) send PIM assert. |
| 2112 | */ |
| 2113 | if (mrt->vif6_table[vif].dev != skb->dev) { |
| 2114 | cache->mfc_un.res.wrong_if++; |
| 2115 | |
| 2116 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
| 2117 | /* pimsm uses asserts, when switching from RPT to SPT, |
| 2118 | so that we cannot check that packet arrived on an oif. |
| 2119 | It is bad, but otherwise we would need to move pretty |
| 2120 | large chunk of pimd to kernel. Ough... --ANK |
| 2121 | */ |
| 2122 | (mrt->mroute_do_pim || |
| 2123 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
| 2124 | time_after(jiffies, |
| 2125 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
| 2126 | cache->mfc_un.res.last_assert = jiffies; |
| 2127 | ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); |
| 2128 | } |
| 2129 | goto dont_forward; |
| 2130 | } |
| 2131 | |
| 2132 | forward: |
| 2133 | mrt->vif6_table[vif].pkt_in++; |
| 2134 | mrt->vif6_table[vif].bytes_in += skb->len; |
| 2135 | |
| 2136 | /* |
| 2137 | * Forward the frame |
| 2138 | */ |
| 2139 | if (ipv6_addr_any(&cache->mf6c_origin) && |
| 2140 | ipv6_addr_any(&cache->mf6c_mcastgrp)) { |
| 2141 | if (true_vifi >= 0 && |
| 2142 | true_vifi != cache->mf6c_parent && |
| 2143 | ipv6_hdr(skb)->hop_limit > |
| 2144 | cache->mfc_un.res.ttls[cache->mf6c_parent]) { |
| 2145 | /* It's an (*,*) entry and the packet is not coming from |
| 2146 | * the upstream: forward the packet to the upstream |
| 2147 | * only. |
| 2148 | */ |
| 2149 | psend = cache->mf6c_parent; |
| 2150 | goto last_forward; |
| 2151 | } |
| 2152 | goto dont_forward; |
| 2153 | } |
| 2154 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { |
| 2155 | /* For (*,G) entry, don't forward to the incoming interface */ |
| 2156 | if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) && |
| 2157 | ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { |
| 2158 | if (psend != -1) { |
| 2159 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 2160 | if (skb2) |
| 2161 | ip6mr_forward2(net, mrt, skb2, cache, psend); |
| 2162 | } |
| 2163 | psend = ct; |
| 2164 | } |
| 2165 | } |
| 2166 | last_forward: |
| 2167 | if (psend != -1) { |
| 2168 | ip6mr_forward2(net, mrt, skb, cache, psend); |
| 2169 | return; |
| 2170 | } |
| 2171 | |
| 2172 | dont_forward: |
| 2173 | kfree_skb(skb); |
| 2174 | } |
| 2175 | |
| 2176 | |
| 2177 | /* |
| 2178 | * Multicast packets for forwarding arrive here |
| 2179 | */ |
| 2180 | |
| 2181 | int ip6_mr_input(struct sk_buff *skb) |
| 2182 | { |
| 2183 | struct mfc6_cache *cache; |
| 2184 | struct net *net = dev_net(skb->dev); |
| 2185 | struct mr6_table *mrt; |
| 2186 | struct flowi6 fl6 = { |
| 2187 | .flowi6_iif = skb->dev->ifindex, |
| 2188 | .flowi6_mark = skb->mark, |
| 2189 | }; |
| 2190 | int err; |
| 2191 | |
| 2192 | err = ip6mr_fib_lookup(net, &fl6, &mrt); |
| 2193 | if (err < 0) { |
| 2194 | kfree_skb(skb); |
| 2195 | return err; |
| 2196 | } |
| 2197 | |
| 2198 | read_lock(&mrt_lock); |
| 2199 | cache = ip6mr_cache_find(mrt, |
| 2200 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
| 2201 | if (!cache) { |
| 2202 | int vif = ip6mr_find_vif(mrt, skb->dev); |
| 2203 | |
| 2204 | if (vif >= 0) |
| 2205 | cache = ip6mr_cache_find_any(mrt, |
| 2206 | &ipv6_hdr(skb)->daddr, |
| 2207 | vif); |
| 2208 | } |
| 2209 | |
| 2210 | /* |
| 2211 | * No usable cache entry |
| 2212 | */ |
| 2213 | if (!cache) { |
| 2214 | int vif; |
| 2215 | |
| 2216 | vif = ip6mr_find_vif(mrt, skb->dev); |
| 2217 | if (vif >= 0) { |
| 2218 | int err = ip6mr_cache_unresolved(mrt, vif, skb); |
| 2219 | read_unlock(&mrt_lock); |
| 2220 | |
| 2221 | return err; |
| 2222 | } |
| 2223 | read_unlock(&mrt_lock); |
| 2224 | kfree_skb(skb); |
| 2225 | return -ENODEV; |
| 2226 | } |
| 2227 | |
| 2228 | ip6_mr_forward(net, mrt, skb, cache); |
| 2229 | |
| 2230 | read_unlock(&mrt_lock); |
| 2231 | |
| 2232 | return 0; |
| 2233 | } |
| 2234 | |
| 2235 | |
| 2236 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
| 2237 | struct mfc6_cache *c, struct rtmsg *rtm) |
| 2238 | { |
| 2239 | int ct; |
| 2240 | struct rtnexthop *nhp; |
| 2241 | struct nlattr *mp_attr; |
| 2242 | struct rta_mfc_stats mfcs; |
| 2243 | |
| 2244 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
| 2245 | if (c->mf6c_parent >= MAXMIFS) |
| 2246 | return -ENOENT; |
| 2247 | |
| 2248 | if (MIF_EXISTS(mrt, c->mf6c_parent) && |
| 2249 | nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0) |
| 2250 | return -EMSGSIZE; |
| 2251 | mp_attr = nla_nest_start(skb, RTA_MULTIPATH); |
| 2252 | if (!mp_attr) |
| 2253 | return -EMSGSIZE; |
| 2254 | |
| 2255 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| 2256 | if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
| 2257 | nhp = nla_reserve_nohdr(skb, sizeof(*nhp)); |
| 2258 | if (!nhp) { |
| 2259 | nla_nest_cancel(skb, mp_attr); |
| 2260 | return -EMSGSIZE; |
| 2261 | } |
| 2262 | |
| 2263 | nhp->rtnh_flags = 0; |
| 2264 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
| 2265 | nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex; |
| 2266 | nhp->rtnh_len = sizeof(*nhp); |
| 2267 | } |
| 2268 | } |
| 2269 | |
| 2270 | nla_nest_end(skb, mp_attr); |
| 2271 | |
| 2272 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
| 2273 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; |
| 2274 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; |
| 2275 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) |
| 2276 | return -EMSGSIZE; |
| 2277 | |
| 2278 | rtm->rtm_type = RTN_MULTICAST; |
| 2279 | return 1; |
| 2280 | } |
| 2281 | |
| 2282 | int ip6mr_get_route(struct net *net, |
| 2283 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) |
| 2284 | { |
| 2285 | int err; |
| 2286 | struct mr6_table *mrt; |
| 2287 | struct mfc6_cache *cache; |
| 2288 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
| 2289 | |
| 2290 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
| 2291 | if (!mrt) |
| 2292 | return -ENOENT; |
| 2293 | |
| 2294 | read_lock(&mrt_lock); |
| 2295 | cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
| 2296 | if (!cache && skb->dev) { |
| 2297 | int vif = ip6mr_find_vif(mrt, skb->dev); |
| 2298 | |
| 2299 | if (vif >= 0) |
| 2300 | cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr, |
| 2301 | vif); |
| 2302 | } |
| 2303 | |
| 2304 | if (!cache) { |
| 2305 | struct sk_buff *skb2; |
| 2306 | struct ipv6hdr *iph; |
| 2307 | struct net_device *dev; |
| 2308 | int vif; |
| 2309 | |
| 2310 | if (nowait) { |
| 2311 | read_unlock(&mrt_lock); |
| 2312 | return -EAGAIN; |
| 2313 | } |
| 2314 | |
| 2315 | dev = skb->dev; |
| 2316 | if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) { |
| 2317 | read_unlock(&mrt_lock); |
| 2318 | return -ENODEV; |
| 2319 | } |
| 2320 | |
| 2321 | /* really correct? */ |
| 2322 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 2323 | if (!skb2) { |
| 2324 | read_unlock(&mrt_lock); |
| 2325 | return -ENOMEM; |
| 2326 | } |
| 2327 | |
| 2328 | skb_reset_transport_header(skb2); |
| 2329 | |
| 2330 | skb_put(skb2, sizeof(struct ipv6hdr)); |
| 2331 | skb_reset_network_header(skb2); |
| 2332 | |
| 2333 | iph = ipv6_hdr(skb2); |
| 2334 | iph->version = 0; |
| 2335 | iph->priority = 0; |
| 2336 | iph->flow_lbl[0] = 0; |
| 2337 | iph->flow_lbl[1] = 0; |
| 2338 | iph->flow_lbl[2] = 0; |
| 2339 | iph->payload_len = 0; |
| 2340 | iph->nexthdr = IPPROTO_NONE; |
| 2341 | iph->hop_limit = 0; |
| 2342 | iph->saddr = rt->rt6i_src.addr; |
| 2343 | iph->daddr = rt->rt6i_dst.addr; |
| 2344 | |
| 2345 | err = ip6mr_cache_unresolved(mrt, vif, skb2); |
| 2346 | read_unlock(&mrt_lock); |
| 2347 | |
| 2348 | return err; |
| 2349 | } |
| 2350 | |
| 2351 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) |
| 2352 | cache->mfc_flags |= MFC_NOTIFY; |
| 2353 | |
| 2354 | err = __ip6mr_fill_mroute(mrt, skb, cache, rtm); |
| 2355 | read_unlock(&mrt_lock); |
| 2356 | return err; |
| 2357 | } |
| 2358 | |
| 2359 | static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
| 2360 | u32 portid, u32 seq, struct mfc6_cache *c, int cmd, |
| 2361 | int flags) |
| 2362 | { |
| 2363 | struct nlmsghdr *nlh; |
| 2364 | struct rtmsg *rtm; |
| 2365 | int err; |
| 2366 | |
| 2367 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
| 2368 | if (!nlh) |
| 2369 | return -EMSGSIZE; |
| 2370 | |
| 2371 | rtm = nlmsg_data(nlh); |
| 2372 | rtm->rtm_family = RTNL_FAMILY_IP6MR; |
| 2373 | rtm->rtm_dst_len = 128; |
| 2374 | rtm->rtm_src_len = 128; |
| 2375 | rtm->rtm_tos = 0; |
| 2376 | rtm->rtm_table = mrt->id; |
| 2377 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
| 2378 | goto nla_put_failure; |
| 2379 | rtm->rtm_type = RTN_MULTICAST; |
| 2380 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2381 | if (c->mfc_flags & MFC_STATIC) |
| 2382 | rtm->rtm_protocol = RTPROT_STATIC; |
| 2383 | else |
| 2384 | rtm->rtm_protocol = RTPROT_MROUTED; |
| 2385 | rtm->rtm_flags = 0; |
| 2386 | |
| 2387 | if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) || |
| 2388 | nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp)) |
| 2389 | goto nla_put_failure; |
| 2390 | err = __ip6mr_fill_mroute(mrt, skb, c, rtm); |
| 2391 | /* do not break the dump if cache is unresolved */ |
| 2392 | if (err < 0 && err != -ENOENT) |
| 2393 | goto nla_put_failure; |
| 2394 | |
| 2395 | nlmsg_end(skb, nlh); |
| 2396 | return 0; |
| 2397 | |
| 2398 | nla_put_failure: |
| 2399 | nlmsg_cancel(skb, nlh); |
| 2400 | return -EMSGSIZE; |
| 2401 | } |
| 2402 | |
| 2403 | static int mr6_msgsize(bool unresolved, int maxvif) |
| 2404 | { |
| 2405 | size_t len = |
| 2406 | NLMSG_ALIGN(sizeof(struct rtmsg)) |
| 2407 | + nla_total_size(4) /* RTA_TABLE */ |
| 2408 | + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */ |
| 2409 | + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */ |
| 2410 | ; |
| 2411 | |
| 2412 | if (!unresolved) |
| 2413 | len = len |
| 2414 | + nla_total_size(4) /* RTA_IIF */ |
| 2415 | + nla_total_size(0) /* RTA_MULTIPATH */ |
| 2416 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) |
| 2417 | /* RTA_MFC_STATS */ |
| 2418 | + nla_total_size(sizeof(struct rta_mfc_stats)) |
| 2419 | ; |
| 2420 | |
| 2421 | return len; |
| 2422 | } |
| 2423 | |
| 2424 | static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc, |
| 2425 | int cmd) |
| 2426 | { |
| 2427 | struct net *net = read_pnet(&mrt->net); |
| 2428 | struct sk_buff *skb; |
| 2429 | int err = -ENOBUFS; |
| 2430 | |
| 2431 | skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif), |
| 2432 | GFP_ATOMIC); |
| 2433 | if (!skb) |
| 2434 | goto errout; |
| 2435 | |
| 2436 | err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
| 2437 | if (err < 0) |
| 2438 | goto errout; |
| 2439 | |
| 2440 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC); |
| 2441 | return; |
| 2442 | |
| 2443 | errout: |
| 2444 | kfree_skb(skb); |
| 2445 | if (err < 0) |
| 2446 | rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err); |
| 2447 | } |
| 2448 | |
| 2449 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
| 2450 | { |
| 2451 | struct net *net = sock_net(skb->sk); |
| 2452 | struct mr6_table *mrt; |
| 2453 | struct mfc6_cache *mfc; |
| 2454 | unsigned int t = 0, s_t; |
| 2455 | unsigned int h = 0, s_h; |
| 2456 | unsigned int e = 0, s_e; |
| 2457 | |
| 2458 | s_t = cb->args[0]; |
| 2459 | s_h = cb->args[1]; |
| 2460 | s_e = cb->args[2]; |
| 2461 | |
| 2462 | read_lock(&mrt_lock); |
| 2463 | ip6mr_for_each_table(mrt, net) { |
| 2464 | if (t < s_t) |
| 2465 | goto next_table; |
| 2466 | if (t > s_t) |
| 2467 | s_h = 0; |
| 2468 | for (h = s_h; h < MFC6_LINES; h++) { |
| 2469 | list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) { |
| 2470 | if (e < s_e) |
| 2471 | goto next_entry; |
| 2472 | if (ip6mr_fill_mroute(mrt, skb, |
| 2473 | NETLINK_CB(cb->skb).portid, |
| 2474 | cb->nlh->nlmsg_seq, |
| 2475 | mfc, RTM_NEWROUTE, |
| 2476 | NLM_F_MULTI) < 0) |
| 2477 | goto done; |
| 2478 | next_entry: |
| 2479 | e++; |
| 2480 | } |
| 2481 | e = s_e = 0; |
| 2482 | } |
| 2483 | spin_lock_bh(&mfc_unres_lock); |
| 2484 | list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) { |
| 2485 | if (e < s_e) |
| 2486 | goto next_entry2; |
| 2487 | if (ip6mr_fill_mroute(mrt, skb, |
| 2488 | NETLINK_CB(cb->skb).portid, |
| 2489 | cb->nlh->nlmsg_seq, |
| 2490 | mfc, RTM_NEWROUTE, |
| 2491 | NLM_F_MULTI) < 0) { |
| 2492 | spin_unlock_bh(&mfc_unres_lock); |
| 2493 | goto done; |
| 2494 | } |
| 2495 | next_entry2: |
| 2496 | e++; |
| 2497 | } |
| 2498 | spin_unlock_bh(&mfc_unres_lock); |
| 2499 | e = s_e = 0; |
| 2500 | s_h = 0; |
| 2501 | next_table: |
| 2502 | t++; |
| 2503 | } |
| 2504 | done: |
| 2505 | read_unlock(&mrt_lock); |
| 2506 | |
| 2507 | cb->args[2] = e; |
| 2508 | cb->args[1] = h; |
| 2509 | cb->args[0] = t; |
| 2510 | |
| 2511 | return skb->len; |
| 2512 | } |