| 1 | /* |
| 2 | * IP multicast routing support for mrouted 3.6/3.8 |
| 3 | * |
| 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
| 5 | * Linux Consultancy and Custom Driver Development |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * Fixes: |
| 13 | * Michael Chastain : Incorrect size of copying. |
| 14 | * Alan Cox : Added the cache manager code |
| 15 | * Alan Cox : Fixed the clone/copy bug and device race. |
| 16 | * Mike McLagan : Routing by source |
| 17 | * Malcolm Beattie : Buffer handling fixes. |
| 18 | * Alexey Kuznetsov : Double buffer free and other fixes. |
| 19 | * SVR Anand : Fixed several multicast bugs and problems. |
| 20 | * Alexey Kuznetsov : Status, optimisations and more. |
| 21 | * Brad Parker : Better behaviour on mrouted upcall |
| 22 | * overflow. |
| 23 | * Carlos Picoto : PIMv1 Support |
| 24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header |
| 25 | * Relax this requirement to work with older peers. |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/capability.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/timer.h> |
| 34 | #include <linux/mm.h> |
| 35 | #include <linux/kernel.h> |
| 36 | #include <linux/fcntl.h> |
| 37 | #include <linux/stat.h> |
| 38 | #include <linux/socket.h> |
| 39 | #include <linux/in.h> |
| 40 | #include <linux/inet.h> |
| 41 | #include <linux/netdevice.h> |
| 42 | #include <linux/inetdevice.h> |
| 43 | #include <linux/igmp.h> |
| 44 | #include <linux/proc_fs.h> |
| 45 | #include <linux/seq_file.h> |
| 46 | #include <linux/mroute.h> |
| 47 | #include <linux/init.h> |
| 48 | #include <linux/if_ether.h> |
| 49 | #include <linux/slab.h> |
| 50 | #include <net/net_namespace.h> |
| 51 | #include <net/ip.h> |
| 52 | #include <net/protocol.h> |
| 53 | #include <linux/skbuff.h> |
| 54 | #include <net/route.h> |
| 55 | #include <net/sock.h> |
| 56 | #include <net/icmp.h> |
| 57 | #include <net/udp.h> |
| 58 | #include <net/raw.h> |
| 59 | #include <linux/notifier.h> |
| 60 | #include <linux/if_arp.h> |
| 61 | #include <linux/netfilter_ipv4.h> |
| 62 | #include <linux/compat.h> |
| 63 | #include <linux/export.h> |
| 64 | #include <net/ip_tunnels.h> |
| 65 | #include <net/checksum.h> |
| 66 | #include <net/netlink.h> |
| 67 | #include <net/fib_rules.h> |
| 68 | #include <linux/netconf.h> |
| 69 | |
| 70 | struct ipmr_rule { |
| 71 | struct fib_rule common; |
| 72 | }; |
| 73 | |
| 74 | struct ipmr_result { |
| 75 | struct mr_table *mrt; |
| 76 | }; |
| 77 | |
| 78 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
| 79 | * Note that the changes are semaphored via rtnl_lock. |
| 80 | */ |
| 81 | |
| 82 | static DEFINE_RWLOCK(mrt_lock); |
| 83 | |
| 84 | /* Multicast router control variables */ |
| 85 | |
| 86 | /* Special spinlock for queue of unresolved entries */ |
| 87 | static DEFINE_SPINLOCK(mfc_unres_lock); |
| 88 | |
| 89 | /* We return to original Alan's scheme. Hash table of resolved |
| 90 | * entries is changed only in process context and protected |
| 91 | * with weak lock mrt_lock. Queue of unresolved entries is protected |
| 92 | * with strong spinlock mfc_unres_lock. |
| 93 | * |
| 94 | * In this case data path is free of exclusive locks at all. |
| 95 | */ |
| 96 | |
| 97 | static struct kmem_cache *mrt_cachep __read_mostly; |
| 98 | |
| 99 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
| 100 | static void ipmr_free_table(struct mr_table *mrt); |
| 101 | |
| 102 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
| 103 | struct sk_buff *skb, struct mfc_cache *cache, |
| 104 | int local); |
| 105 | static int ipmr_cache_report(struct mr_table *mrt, |
| 106 | struct sk_buff *pkt, vifi_t vifi, int assert); |
| 107 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
| 108 | struct mfc_cache *c, struct rtmsg *rtm); |
| 109 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
| 110 | int cmd); |
| 111 | static void mroute_clean_tables(struct mr_table *mrt); |
| 112 | static void ipmr_expire_process(unsigned long arg); |
| 113 | |
| 114 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES |
| 115 | #define ipmr_for_each_table(mrt, net) \ |
| 116 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) |
| 117 | |
| 118 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
| 119 | { |
| 120 | struct mr_table *mrt; |
| 121 | |
| 122 | ipmr_for_each_table(mrt, net) { |
| 123 | if (mrt->id == id) |
| 124 | return mrt; |
| 125 | } |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
| 130 | struct mr_table **mrt) |
| 131 | { |
| 132 | int err; |
| 133 | struct ipmr_result res; |
| 134 | struct fib_lookup_arg arg = { |
| 135 | .result = &res, |
| 136 | .flags = FIB_LOOKUP_NOREF, |
| 137 | }; |
| 138 | |
| 139 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
| 140 | flowi4_to_flowi(flp4), 0, &arg); |
| 141 | if (err < 0) |
| 142 | return err; |
| 143 | *mrt = res.mrt; |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, |
| 148 | int flags, struct fib_lookup_arg *arg) |
| 149 | { |
| 150 | struct ipmr_result *res = arg->result; |
| 151 | struct mr_table *mrt; |
| 152 | |
| 153 | switch (rule->action) { |
| 154 | case FR_ACT_TO_TBL: |
| 155 | break; |
| 156 | case FR_ACT_UNREACHABLE: |
| 157 | return -ENETUNREACH; |
| 158 | case FR_ACT_PROHIBIT: |
| 159 | return -EACCES; |
| 160 | case FR_ACT_BLACKHOLE: |
| 161 | default: |
| 162 | return -EINVAL; |
| 163 | } |
| 164 | |
| 165 | mrt = ipmr_get_table(rule->fr_net, rule->table); |
| 166 | if (!mrt) |
| 167 | return -EAGAIN; |
| 168 | res->mrt = mrt; |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
| 173 | { |
| 174 | return 1; |
| 175 | } |
| 176 | |
| 177 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { |
| 178 | FRA_GENERIC_POLICY, |
| 179 | }; |
| 180 | |
| 181 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, |
| 182 | struct fib_rule_hdr *frh, struct nlattr **tb) |
| 183 | { |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
| 188 | struct nlattr **tb) |
| 189 | { |
| 190 | return 1; |
| 191 | } |
| 192 | |
| 193 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
| 194 | struct fib_rule_hdr *frh) |
| 195 | { |
| 196 | frh->dst_len = 0; |
| 197 | frh->src_len = 0; |
| 198 | frh->tos = 0; |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
| 203 | .family = RTNL_FAMILY_IPMR, |
| 204 | .rule_size = sizeof(struct ipmr_rule), |
| 205 | .addr_size = sizeof(u32), |
| 206 | .action = ipmr_rule_action, |
| 207 | .match = ipmr_rule_match, |
| 208 | .configure = ipmr_rule_configure, |
| 209 | .compare = ipmr_rule_compare, |
| 210 | .fill = ipmr_rule_fill, |
| 211 | .nlgroup = RTNLGRP_IPV4_RULE, |
| 212 | .policy = ipmr_rule_policy, |
| 213 | .owner = THIS_MODULE, |
| 214 | }; |
| 215 | |
| 216 | static int __net_init ipmr_rules_init(struct net *net) |
| 217 | { |
| 218 | struct fib_rules_ops *ops; |
| 219 | struct mr_table *mrt; |
| 220 | int err; |
| 221 | |
| 222 | ops = fib_rules_register(&ipmr_rules_ops_template, net); |
| 223 | if (IS_ERR(ops)) |
| 224 | return PTR_ERR(ops); |
| 225 | |
| 226 | INIT_LIST_HEAD(&net->ipv4.mr_tables); |
| 227 | |
| 228 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); |
| 229 | if (IS_ERR(mrt)) { |
| 230 | err = PTR_ERR(mrt); |
| 231 | goto err1; |
| 232 | } |
| 233 | |
| 234 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); |
| 235 | if (err < 0) |
| 236 | goto err2; |
| 237 | |
| 238 | net->ipv4.mr_rules_ops = ops; |
| 239 | return 0; |
| 240 | |
| 241 | err2: |
| 242 | ipmr_free_table(mrt); |
| 243 | err1: |
| 244 | fib_rules_unregister(ops); |
| 245 | return err; |
| 246 | } |
| 247 | |
| 248 | static void __net_exit ipmr_rules_exit(struct net *net) |
| 249 | { |
| 250 | struct mr_table *mrt, *next; |
| 251 | |
| 252 | rtnl_lock(); |
| 253 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
| 254 | list_del(&mrt->list); |
| 255 | ipmr_free_table(mrt); |
| 256 | } |
| 257 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
| 258 | rtnl_unlock(); |
| 259 | } |
| 260 | #else |
| 261 | #define ipmr_for_each_table(mrt, net) \ |
| 262 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) |
| 263 | |
| 264 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
| 265 | { |
| 266 | return net->ipv4.mrt; |
| 267 | } |
| 268 | |
| 269 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
| 270 | struct mr_table **mrt) |
| 271 | { |
| 272 | *mrt = net->ipv4.mrt; |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | static int __net_init ipmr_rules_init(struct net *net) |
| 277 | { |
| 278 | struct mr_table *mrt; |
| 279 | |
| 280 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); |
| 281 | if (IS_ERR(mrt)) |
| 282 | return PTR_ERR(mrt); |
| 283 | net->ipv4.mrt = mrt; |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static void __net_exit ipmr_rules_exit(struct net *net) |
| 288 | { |
| 289 | rtnl_lock(); |
| 290 | ipmr_free_table(net->ipv4.mrt); |
| 291 | net->ipv4.mrt = NULL; |
| 292 | rtnl_unlock(); |
| 293 | } |
| 294 | #endif |
| 295 | |
| 296 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) |
| 297 | { |
| 298 | struct mr_table *mrt; |
| 299 | unsigned int i; |
| 300 | |
| 301 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
| 302 | if (id != RT_TABLE_DEFAULT && id >= 1000000000) |
| 303 | return ERR_PTR(-EINVAL); |
| 304 | |
| 305 | mrt = ipmr_get_table(net, id); |
| 306 | if (mrt) |
| 307 | return mrt; |
| 308 | |
| 309 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); |
| 310 | if (!mrt) |
| 311 | return ERR_PTR(-ENOMEM); |
| 312 | write_pnet(&mrt->net, net); |
| 313 | mrt->id = id; |
| 314 | |
| 315 | /* Forwarding cache */ |
| 316 | for (i = 0; i < MFC_LINES; i++) |
| 317 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); |
| 318 | |
| 319 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); |
| 320 | |
| 321 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, |
| 322 | (unsigned long)mrt); |
| 323 | |
| 324 | mrt->mroute_reg_vif_num = -1; |
| 325 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES |
| 326 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); |
| 327 | #endif |
| 328 | return mrt; |
| 329 | } |
| 330 | |
| 331 | static void ipmr_free_table(struct mr_table *mrt) |
| 332 | { |
| 333 | del_timer_sync(&mrt->ipmr_expire_timer); |
| 334 | mroute_clean_tables(mrt); |
| 335 | kfree(mrt); |
| 336 | } |
| 337 | |
| 338 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
| 339 | |
| 340 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
| 341 | { |
| 342 | struct net *net = dev_net(dev); |
| 343 | |
| 344 | dev_close(dev); |
| 345 | |
| 346 | dev = __dev_get_by_name(net, "tunl0"); |
| 347 | if (dev) { |
| 348 | const struct net_device_ops *ops = dev->netdev_ops; |
| 349 | struct ifreq ifr; |
| 350 | struct ip_tunnel_parm p; |
| 351 | |
| 352 | memset(&p, 0, sizeof(p)); |
| 353 | p.iph.daddr = v->vifc_rmt_addr.s_addr; |
| 354 | p.iph.saddr = v->vifc_lcl_addr.s_addr; |
| 355 | p.iph.version = 4; |
| 356 | p.iph.ihl = 5; |
| 357 | p.iph.protocol = IPPROTO_IPIP; |
| 358 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); |
| 359 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| 360 | |
| 361 | if (ops->ndo_do_ioctl) { |
| 362 | mm_segment_t oldfs = get_fs(); |
| 363 | |
| 364 | set_fs(KERNEL_DS); |
| 365 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); |
| 366 | set_fs(oldfs); |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* Initialize ipmr pimreg/tunnel in_device */ |
| 372 | static bool ipmr_init_vif_indev(const struct net_device *dev) |
| 373 | { |
| 374 | struct in_device *in_dev; |
| 375 | |
| 376 | ASSERT_RTNL(); |
| 377 | |
| 378 | in_dev = __in_dev_get_rtnl(dev); |
| 379 | if (!in_dev) |
| 380 | return false; |
| 381 | ipv4_devconf_setall(in_dev); |
| 382 | neigh_parms_data_state_setall(in_dev->arp_parms); |
| 383 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
| 384 | |
| 385 | return true; |
| 386 | } |
| 387 | |
| 388 | static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
| 389 | { |
| 390 | struct net_device *dev; |
| 391 | |
| 392 | dev = __dev_get_by_name(net, "tunl0"); |
| 393 | |
| 394 | if (dev) { |
| 395 | const struct net_device_ops *ops = dev->netdev_ops; |
| 396 | int err; |
| 397 | struct ifreq ifr; |
| 398 | struct ip_tunnel_parm p; |
| 399 | |
| 400 | memset(&p, 0, sizeof(p)); |
| 401 | p.iph.daddr = v->vifc_rmt_addr.s_addr; |
| 402 | p.iph.saddr = v->vifc_lcl_addr.s_addr; |
| 403 | p.iph.version = 4; |
| 404 | p.iph.ihl = 5; |
| 405 | p.iph.protocol = IPPROTO_IPIP; |
| 406 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); |
| 407 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
| 408 | |
| 409 | if (ops->ndo_do_ioctl) { |
| 410 | mm_segment_t oldfs = get_fs(); |
| 411 | |
| 412 | set_fs(KERNEL_DS); |
| 413 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); |
| 414 | set_fs(oldfs); |
| 415 | } else { |
| 416 | err = -EOPNOTSUPP; |
| 417 | } |
| 418 | dev = NULL; |
| 419 | |
| 420 | if (err == 0 && |
| 421 | (dev = __dev_get_by_name(net, p.name)) != NULL) { |
| 422 | dev->flags |= IFF_MULTICAST; |
| 423 | if (!ipmr_init_vif_indev(dev)) |
| 424 | goto failure; |
| 425 | if (dev_open(dev)) |
| 426 | goto failure; |
| 427 | dev_hold(dev); |
| 428 | } |
| 429 | } |
| 430 | return dev; |
| 431 | |
| 432 | failure: |
| 433 | /* allow the register to be completed before unregistering. */ |
| 434 | rtnl_unlock(); |
| 435 | rtnl_lock(); |
| 436 | |
| 437 | unregister_netdevice(dev); |
| 438 | return NULL; |
| 439 | } |
| 440 | |
| 441 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
| 442 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
| 443 | { |
| 444 | struct net *net = dev_net(dev); |
| 445 | struct mr_table *mrt; |
| 446 | struct flowi4 fl4 = { |
| 447 | .flowi4_oif = dev->ifindex, |
| 448 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
| 449 | .flowi4_mark = skb->mark, |
| 450 | }; |
| 451 | int err; |
| 452 | |
| 453 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
| 454 | if (err < 0) { |
| 455 | kfree_skb(skb); |
| 456 | return err; |
| 457 | } |
| 458 | |
| 459 | read_lock(&mrt_lock); |
| 460 | dev->stats.tx_bytes += skb->len; |
| 461 | dev->stats.tx_packets++; |
| 462 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
| 463 | read_unlock(&mrt_lock); |
| 464 | kfree_skb(skb); |
| 465 | return NETDEV_TX_OK; |
| 466 | } |
| 467 | |
| 468 | static int reg_vif_get_iflink(const struct net_device *dev) |
| 469 | { |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static const struct net_device_ops reg_vif_netdev_ops = { |
| 474 | .ndo_start_xmit = reg_vif_xmit, |
| 475 | .ndo_get_iflink = reg_vif_get_iflink, |
| 476 | }; |
| 477 | |
| 478 | static void reg_vif_setup(struct net_device *dev) |
| 479 | { |
| 480 | dev->type = ARPHRD_PIMREG; |
| 481 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
| 482 | dev->flags = IFF_NOARP; |
| 483 | dev->netdev_ops = ®_vif_netdev_ops; |
| 484 | dev->destructor = free_netdev; |
| 485 | dev->features |= NETIF_F_NETNS_LOCAL; |
| 486 | } |
| 487 | |
| 488 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
| 489 | { |
| 490 | struct net_device *dev; |
| 491 | char name[IFNAMSIZ]; |
| 492 | |
| 493 | if (mrt->id == RT_TABLE_DEFAULT) |
| 494 | sprintf(name, "pimreg"); |
| 495 | else |
| 496 | sprintf(name, "pimreg%u", mrt->id); |
| 497 | |
| 498 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
| 499 | |
| 500 | if (!dev) |
| 501 | return NULL; |
| 502 | |
| 503 | dev_net_set(dev, net); |
| 504 | |
| 505 | if (register_netdevice(dev)) { |
| 506 | free_netdev(dev); |
| 507 | return NULL; |
| 508 | } |
| 509 | |
| 510 | if (!ipmr_init_vif_indev(dev)) |
| 511 | goto failure; |
| 512 | if (dev_open(dev)) |
| 513 | goto failure; |
| 514 | |
| 515 | dev_hold(dev); |
| 516 | |
| 517 | return dev; |
| 518 | |
| 519 | failure: |
| 520 | /* allow the register to be completed before unregistering. */ |
| 521 | rtnl_unlock(); |
| 522 | rtnl_lock(); |
| 523 | |
| 524 | unregister_netdevice(dev); |
| 525 | return NULL; |
| 526 | } |
| 527 | |
| 528 | /* called with rcu_read_lock() */ |
| 529 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
| 530 | unsigned int pimlen) |
| 531 | { |
| 532 | struct net_device *reg_dev = NULL; |
| 533 | struct iphdr *encap; |
| 534 | |
| 535 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
| 536 | /* Check that: |
| 537 | * a. packet is really sent to a multicast group |
| 538 | * b. packet is not a NULL-REGISTER |
| 539 | * c. packet is not truncated |
| 540 | */ |
| 541 | if (!ipv4_is_multicast(encap->daddr) || |
| 542 | encap->tot_len == 0 || |
| 543 | ntohs(encap->tot_len) + pimlen > skb->len) |
| 544 | return 1; |
| 545 | |
| 546 | read_lock(&mrt_lock); |
| 547 | if (mrt->mroute_reg_vif_num >= 0) |
| 548 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; |
| 549 | read_unlock(&mrt_lock); |
| 550 | |
| 551 | if (!reg_dev) |
| 552 | return 1; |
| 553 | |
| 554 | skb->mac_header = skb->network_header; |
| 555 | skb_pull(skb, (u8 *)encap - skb->data); |
| 556 | skb_reset_network_header(skb); |
| 557 | skb->protocol = htons(ETH_P_IP); |
| 558 | skb->ip_summed = CHECKSUM_NONE; |
| 559 | |
| 560 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
| 561 | |
| 562 | netif_rx(skb); |
| 563 | |
| 564 | return NET_RX_SUCCESS; |
| 565 | } |
| 566 | #else |
| 567 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
| 568 | { |
| 569 | return NULL; |
| 570 | } |
| 571 | #endif |
| 572 | |
| 573 | /** |
| 574 | * vif_delete - Delete a VIF entry |
| 575 | * @notify: Set to 1, if the caller is a notifier_call |
| 576 | */ |
| 577 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
| 578 | struct list_head *head) |
| 579 | { |
| 580 | struct vif_device *v; |
| 581 | struct net_device *dev; |
| 582 | struct in_device *in_dev; |
| 583 | |
| 584 | if (vifi < 0 || vifi >= mrt->maxvif) |
| 585 | return -EADDRNOTAVAIL; |
| 586 | |
| 587 | v = &mrt->vif_table[vifi]; |
| 588 | |
| 589 | write_lock_bh(&mrt_lock); |
| 590 | dev = v->dev; |
| 591 | v->dev = NULL; |
| 592 | |
| 593 | if (!dev) { |
| 594 | write_unlock_bh(&mrt_lock); |
| 595 | return -EADDRNOTAVAIL; |
| 596 | } |
| 597 | |
| 598 | if (vifi == mrt->mroute_reg_vif_num) |
| 599 | mrt->mroute_reg_vif_num = -1; |
| 600 | |
| 601 | if (vifi + 1 == mrt->maxvif) { |
| 602 | int tmp; |
| 603 | |
| 604 | for (tmp = vifi - 1; tmp >= 0; tmp--) { |
| 605 | if (VIF_EXISTS(mrt, tmp)) |
| 606 | break; |
| 607 | } |
| 608 | mrt->maxvif = tmp+1; |
| 609 | } |
| 610 | |
| 611 | write_unlock_bh(&mrt_lock); |
| 612 | |
| 613 | dev_set_allmulti(dev, -1); |
| 614 | |
| 615 | in_dev = __in_dev_get_rtnl(dev); |
| 616 | if (in_dev) { |
| 617 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
| 618 | inet_netconf_notify_devconf(dev_net(dev), |
| 619 | NETCONFA_MC_FORWARDING, |
| 620 | dev->ifindex, &in_dev->cnf); |
| 621 | ip_rt_multicast_event(in_dev); |
| 622 | } |
| 623 | |
| 624 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
| 625 | unregister_netdevice_queue(dev, head); |
| 626 | |
| 627 | dev_put(dev); |
| 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
| 632 | { |
| 633 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
| 634 | |
| 635 | kmem_cache_free(mrt_cachep, c); |
| 636 | } |
| 637 | |
| 638 | static inline void ipmr_cache_free(struct mfc_cache *c) |
| 639 | { |
| 640 | call_rcu(&c->rcu, ipmr_cache_free_rcu); |
| 641 | } |
| 642 | |
| 643 | /* Destroy an unresolved cache entry, killing queued skbs |
| 644 | * and reporting error to netlink readers. |
| 645 | */ |
| 646 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
| 647 | { |
| 648 | struct net *net = read_pnet(&mrt->net); |
| 649 | struct sk_buff *skb; |
| 650 | struct nlmsgerr *e; |
| 651 | |
| 652 | atomic_dec(&mrt->cache_resolve_queue_len); |
| 653 | |
| 654 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
| 655 | if (ip_hdr(skb)->version == 0) { |
| 656 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
| 657 | nlh->nlmsg_type = NLMSG_ERROR; |
| 658 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
| 659 | skb_trim(skb, nlh->nlmsg_len); |
| 660 | e = nlmsg_data(nlh); |
| 661 | e->error = -ETIMEDOUT; |
| 662 | memset(&e->msg, 0, sizeof(e->msg)); |
| 663 | |
| 664 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
| 665 | } else { |
| 666 | kfree_skb(skb); |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | ipmr_cache_free(c); |
| 671 | } |
| 672 | |
| 673 | /* Timer process for the unresolved queue. */ |
| 674 | static void ipmr_expire_process(unsigned long arg) |
| 675 | { |
| 676 | struct mr_table *mrt = (struct mr_table *)arg; |
| 677 | unsigned long now; |
| 678 | unsigned long expires; |
| 679 | struct mfc_cache *c, *next; |
| 680 | |
| 681 | if (!spin_trylock(&mfc_unres_lock)) { |
| 682 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
| 683 | return; |
| 684 | } |
| 685 | |
| 686 | if (list_empty(&mrt->mfc_unres_queue)) |
| 687 | goto out; |
| 688 | |
| 689 | now = jiffies; |
| 690 | expires = 10*HZ; |
| 691 | |
| 692 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
| 693 | if (time_after(c->mfc_un.unres.expires, now)) { |
| 694 | unsigned long interval = c->mfc_un.unres.expires - now; |
| 695 | if (interval < expires) |
| 696 | expires = interval; |
| 697 | continue; |
| 698 | } |
| 699 | |
| 700 | list_del(&c->list); |
| 701 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
| 702 | ipmr_destroy_unres(mrt, c); |
| 703 | } |
| 704 | |
| 705 | if (!list_empty(&mrt->mfc_unres_queue)) |
| 706 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); |
| 707 | |
| 708 | out: |
| 709 | spin_unlock(&mfc_unres_lock); |
| 710 | } |
| 711 | |
| 712 | /* Fill oifs list. It is called under write locked mrt_lock. */ |
| 713 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
| 714 | unsigned char *ttls) |
| 715 | { |
| 716 | int vifi; |
| 717 | |
| 718 | cache->mfc_un.res.minvif = MAXVIFS; |
| 719 | cache->mfc_un.res.maxvif = 0; |
| 720 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); |
| 721 | |
| 722 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
| 723 | if (VIF_EXISTS(mrt, vifi) && |
| 724 | ttls[vifi] && ttls[vifi] < 255) { |
| 725 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
| 726 | if (cache->mfc_un.res.minvif > vifi) |
| 727 | cache->mfc_un.res.minvif = vifi; |
| 728 | if (cache->mfc_un.res.maxvif <= vifi) |
| 729 | cache->mfc_un.res.maxvif = vifi + 1; |
| 730 | } |
| 731 | } |
| 732 | } |
| 733 | |
| 734 | static int vif_add(struct net *net, struct mr_table *mrt, |
| 735 | struct vifctl *vifc, int mrtsock) |
| 736 | { |
| 737 | int vifi = vifc->vifc_vifi; |
| 738 | struct vif_device *v = &mrt->vif_table[vifi]; |
| 739 | struct net_device *dev; |
| 740 | struct in_device *in_dev; |
| 741 | int err; |
| 742 | |
| 743 | /* Is vif busy ? */ |
| 744 | if (VIF_EXISTS(mrt, vifi)) |
| 745 | return -EADDRINUSE; |
| 746 | |
| 747 | switch (vifc->vifc_flags) { |
| 748 | case VIFF_REGISTER: |
| 749 | if (!ipmr_pimsm_enabled()) |
| 750 | return -EINVAL; |
| 751 | /* Special Purpose VIF in PIM |
| 752 | * All the packets will be sent to the daemon |
| 753 | */ |
| 754 | if (mrt->mroute_reg_vif_num >= 0) |
| 755 | return -EADDRINUSE; |
| 756 | dev = ipmr_reg_vif(net, mrt); |
| 757 | if (!dev) |
| 758 | return -ENOBUFS; |
| 759 | err = dev_set_allmulti(dev, 1); |
| 760 | if (err) { |
| 761 | unregister_netdevice(dev); |
| 762 | dev_put(dev); |
| 763 | return err; |
| 764 | } |
| 765 | break; |
| 766 | case VIFF_TUNNEL: |
| 767 | dev = ipmr_new_tunnel(net, vifc); |
| 768 | if (!dev) |
| 769 | return -ENOBUFS; |
| 770 | err = dev_set_allmulti(dev, 1); |
| 771 | if (err) { |
| 772 | ipmr_del_tunnel(dev, vifc); |
| 773 | dev_put(dev); |
| 774 | return err; |
| 775 | } |
| 776 | break; |
| 777 | case VIFF_USE_IFINDEX: |
| 778 | case 0: |
| 779 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
| 780 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); |
| 781 | if (dev && !__in_dev_get_rtnl(dev)) { |
| 782 | dev_put(dev); |
| 783 | return -EADDRNOTAVAIL; |
| 784 | } |
| 785 | } else { |
| 786 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
| 787 | } |
| 788 | if (!dev) |
| 789 | return -EADDRNOTAVAIL; |
| 790 | err = dev_set_allmulti(dev, 1); |
| 791 | if (err) { |
| 792 | dev_put(dev); |
| 793 | return err; |
| 794 | } |
| 795 | break; |
| 796 | default: |
| 797 | return -EINVAL; |
| 798 | } |
| 799 | |
| 800 | in_dev = __in_dev_get_rtnl(dev); |
| 801 | if (!in_dev) { |
| 802 | dev_put(dev); |
| 803 | return -EADDRNOTAVAIL; |
| 804 | } |
| 805 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
| 806 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex, |
| 807 | &in_dev->cnf); |
| 808 | ip_rt_multicast_event(in_dev); |
| 809 | |
| 810 | /* Fill in the VIF structures */ |
| 811 | |
| 812 | v->rate_limit = vifc->vifc_rate_limit; |
| 813 | v->local = vifc->vifc_lcl_addr.s_addr; |
| 814 | v->remote = vifc->vifc_rmt_addr.s_addr; |
| 815 | v->flags = vifc->vifc_flags; |
| 816 | if (!mrtsock) |
| 817 | v->flags |= VIFF_STATIC; |
| 818 | v->threshold = vifc->vifc_threshold; |
| 819 | v->bytes_in = 0; |
| 820 | v->bytes_out = 0; |
| 821 | v->pkt_in = 0; |
| 822 | v->pkt_out = 0; |
| 823 | v->link = dev->ifindex; |
| 824 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
| 825 | v->link = dev_get_iflink(dev); |
| 826 | |
| 827 | /* And finish update writing critical data */ |
| 828 | write_lock_bh(&mrt_lock); |
| 829 | v->dev = dev; |
| 830 | if (v->flags & VIFF_REGISTER) |
| 831 | mrt->mroute_reg_vif_num = vifi; |
| 832 | if (vifi+1 > mrt->maxvif) |
| 833 | mrt->maxvif = vifi+1; |
| 834 | write_unlock_bh(&mrt_lock); |
| 835 | return 0; |
| 836 | } |
| 837 | |
| 838 | /* called with rcu_read_lock() */ |
| 839 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
| 840 | __be32 origin, |
| 841 | __be32 mcastgrp) |
| 842 | { |
| 843 | int line = MFC_HASH(mcastgrp, origin); |
| 844 | struct mfc_cache *c; |
| 845 | |
| 846 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { |
| 847 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
| 848 | return c; |
| 849 | } |
| 850 | return NULL; |
| 851 | } |
| 852 | |
| 853 | /* Look for a (*,*,oif) entry */ |
| 854 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, |
| 855 | int vifi) |
| 856 | { |
| 857 | int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY)); |
| 858 | struct mfc_cache *c; |
| 859 | |
| 860 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) |
| 861 | if (c->mfc_origin == htonl(INADDR_ANY) && |
| 862 | c->mfc_mcastgrp == htonl(INADDR_ANY) && |
| 863 | c->mfc_un.res.ttls[vifi] < 255) |
| 864 | return c; |
| 865 | |
| 866 | return NULL; |
| 867 | } |
| 868 | |
| 869 | /* Look for a (*,G) entry */ |
| 870 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, |
| 871 | __be32 mcastgrp, int vifi) |
| 872 | { |
| 873 | int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY)); |
| 874 | struct mfc_cache *c, *proxy; |
| 875 | |
| 876 | if (mcastgrp == htonl(INADDR_ANY)) |
| 877 | goto skip; |
| 878 | |
| 879 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) |
| 880 | if (c->mfc_origin == htonl(INADDR_ANY) && |
| 881 | c->mfc_mcastgrp == mcastgrp) { |
| 882 | if (c->mfc_un.res.ttls[vifi] < 255) |
| 883 | return c; |
| 884 | |
| 885 | /* It's ok if the vifi is part of the static tree */ |
| 886 | proxy = ipmr_cache_find_any_parent(mrt, |
| 887 | c->mfc_parent); |
| 888 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) |
| 889 | return c; |
| 890 | } |
| 891 | |
| 892 | skip: |
| 893 | return ipmr_cache_find_any_parent(mrt, vifi); |
| 894 | } |
| 895 | |
| 896 | /* Allocate a multicast cache entry */ |
| 897 | static struct mfc_cache *ipmr_cache_alloc(void) |
| 898 | { |
| 899 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
| 900 | |
| 901 | if (c) |
| 902 | c->mfc_un.res.minvif = MAXVIFS; |
| 903 | return c; |
| 904 | } |
| 905 | |
| 906 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
| 907 | { |
| 908 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
| 909 | |
| 910 | if (c) { |
| 911 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
| 912 | c->mfc_un.unres.expires = jiffies + 10*HZ; |
| 913 | } |
| 914 | return c; |
| 915 | } |
| 916 | |
| 917 | /* A cache entry has gone into a resolved state from queued */ |
| 918 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
| 919 | struct mfc_cache *uc, struct mfc_cache *c) |
| 920 | { |
| 921 | struct sk_buff *skb; |
| 922 | struct nlmsgerr *e; |
| 923 | |
| 924 | /* Play the pending entries through our router */ |
| 925 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
| 926 | if (ip_hdr(skb)->version == 0) { |
| 927 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
| 928 | |
| 929 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
| 930 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
| 931 | (u8 *)nlh; |
| 932 | } else { |
| 933 | nlh->nlmsg_type = NLMSG_ERROR; |
| 934 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
| 935 | skb_trim(skb, nlh->nlmsg_len); |
| 936 | e = nlmsg_data(nlh); |
| 937 | e->error = -EMSGSIZE; |
| 938 | memset(&e->msg, 0, sizeof(e->msg)); |
| 939 | } |
| 940 | |
| 941 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
| 942 | } else { |
| 943 | ip_mr_forward(net, mrt, skb, c, 0); |
| 944 | } |
| 945 | } |
| 946 | } |
| 947 | |
| 948 | /* Bounce a cache query up to mrouted. We could use netlink for this but mrouted |
| 949 | * expects the following bizarre scheme. |
| 950 | * |
| 951 | * Called under mrt_lock. |
| 952 | */ |
| 953 | static int ipmr_cache_report(struct mr_table *mrt, |
| 954 | struct sk_buff *pkt, vifi_t vifi, int assert) |
| 955 | { |
| 956 | const int ihl = ip_hdrlen(pkt); |
| 957 | struct sock *mroute_sk; |
| 958 | struct igmphdr *igmp; |
| 959 | struct igmpmsg *msg; |
| 960 | struct sk_buff *skb; |
| 961 | int ret; |
| 962 | |
| 963 | if (assert == IGMPMSG_WHOLEPKT) |
| 964 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); |
| 965 | else |
| 966 | skb = alloc_skb(128, GFP_ATOMIC); |
| 967 | |
| 968 | if (!skb) |
| 969 | return -ENOBUFS; |
| 970 | |
| 971 | if (assert == IGMPMSG_WHOLEPKT) { |
| 972 | /* Ugly, but we have no choice with this interface. |
| 973 | * Duplicate old header, fix ihl, length etc. |
| 974 | * And all this only to mangle msg->im_msgtype and |
| 975 | * to set msg->im_mbz to "mbz" :-) |
| 976 | */ |
| 977 | skb_push(skb, sizeof(struct iphdr)); |
| 978 | skb_reset_network_header(skb); |
| 979 | skb_reset_transport_header(skb); |
| 980 | msg = (struct igmpmsg *)skb_network_header(skb); |
| 981 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
| 982 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
| 983 | msg->im_mbz = 0; |
| 984 | msg->im_vif = mrt->mroute_reg_vif_num; |
| 985 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
| 986 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + |
| 987 | sizeof(struct iphdr)); |
| 988 | } else { |
| 989 | /* Copy the IP header */ |
| 990 | skb_set_network_header(skb, skb->len); |
| 991 | skb_put(skb, ihl); |
| 992 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
| 993 | /* Flag to the kernel this is a route add */ |
| 994 | ip_hdr(skb)->protocol = 0; |
| 995 | msg = (struct igmpmsg *)skb_network_header(skb); |
| 996 | msg->im_vif = vifi; |
| 997 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
| 998 | /* Add our header */ |
| 999 | igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
| 1000 | igmp->type = assert; |
| 1001 | msg->im_msgtype = assert; |
| 1002 | igmp->code = 0; |
| 1003 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
| 1004 | skb->transport_header = skb->network_header; |
| 1005 | } |
| 1006 | |
| 1007 | rcu_read_lock(); |
| 1008 | mroute_sk = rcu_dereference(mrt->mroute_sk); |
| 1009 | if (!mroute_sk) { |
| 1010 | rcu_read_unlock(); |
| 1011 | kfree_skb(skb); |
| 1012 | return -EINVAL; |
| 1013 | } |
| 1014 | |
| 1015 | /* Deliver to mrouted */ |
| 1016 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
| 1017 | rcu_read_unlock(); |
| 1018 | if (ret < 0) { |
| 1019 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
| 1020 | kfree_skb(skb); |
| 1021 | } |
| 1022 | |
| 1023 | return ret; |
| 1024 | } |
| 1025 | |
| 1026 | /* Queue a packet for resolution. It gets locked cache entry! */ |
| 1027 | static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, |
| 1028 | struct sk_buff *skb) |
| 1029 | { |
| 1030 | bool found = false; |
| 1031 | int err; |
| 1032 | struct mfc_cache *c; |
| 1033 | const struct iphdr *iph = ip_hdr(skb); |
| 1034 | |
| 1035 | spin_lock_bh(&mfc_unres_lock); |
| 1036 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
| 1037 | if (c->mfc_mcastgrp == iph->daddr && |
| 1038 | c->mfc_origin == iph->saddr) { |
| 1039 | found = true; |
| 1040 | break; |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | if (!found) { |
| 1045 | /* Create a new entry if allowable */ |
| 1046 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
| 1047 | (c = ipmr_cache_alloc_unres()) == NULL) { |
| 1048 | spin_unlock_bh(&mfc_unres_lock); |
| 1049 | |
| 1050 | kfree_skb(skb); |
| 1051 | return -ENOBUFS; |
| 1052 | } |
| 1053 | |
| 1054 | /* Fill in the new cache entry */ |
| 1055 | c->mfc_parent = -1; |
| 1056 | c->mfc_origin = iph->saddr; |
| 1057 | c->mfc_mcastgrp = iph->daddr; |
| 1058 | |
| 1059 | /* Reflect first query at mrouted. */ |
| 1060 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
| 1061 | if (err < 0) { |
| 1062 | /* If the report failed throw the cache entry |
| 1063 | out - Brad Parker |
| 1064 | */ |
| 1065 | spin_unlock_bh(&mfc_unres_lock); |
| 1066 | |
| 1067 | ipmr_cache_free(c); |
| 1068 | kfree_skb(skb); |
| 1069 | return err; |
| 1070 | } |
| 1071 | |
| 1072 | atomic_inc(&mrt->cache_resolve_queue_len); |
| 1073 | list_add(&c->list, &mrt->mfc_unres_queue); |
| 1074 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
| 1075 | |
| 1076 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
| 1077 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); |
| 1078 | } |
| 1079 | |
| 1080 | /* See if we can append the packet */ |
| 1081 | if (c->mfc_un.unres.unresolved.qlen > 3) { |
| 1082 | kfree_skb(skb); |
| 1083 | err = -ENOBUFS; |
| 1084 | } else { |
| 1085 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
| 1086 | err = 0; |
| 1087 | } |
| 1088 | |
| 1089 | spin_unlock_bh(&mfc_unres_lock); |
| 1090 | return err; |
| 1091 | } |
| 1092 | |
| 1093 | /* MFC cache manipulation by user space mroute daemon */ |
| 1094 | |
| 1095 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
| 1096 | { |
| 1097 | int line; |
| 1098 | struct mfc_cache *c, *next; |
| 1099 | |
| 1100 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
| 1101 | |
| 1102 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
| 1103 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
| 1104 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
| 1105 | (parent == -1 || parent == c->mfc_parent)) { |
| 1106 | list_del_rcu(&c->list); |
| 1107 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
| 1108 | ipmr_cache_free(c); |
| 1109 | return 0; |
| 1110 | } |
| 1111 | } |
| 1112 | return -ENOENT; |
| 1113 | } |
| 1114 | |
| 1115 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
| 1116 | struct mfcctl *mfc, int mrtsock, int parent) |
| 1117 | { |
| 1118 | bool found = false; |
| 1119 | int line; |
| 1120 | struct mfc_cache *uc, *c; |
| 1121 | |
| 1122 | if (mfc->mfcc_parent >= MAXVIFS) |
| 1123 | return -ENFILE; |
| 1124 | |
| 1125 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
| 1126 | |
| 1127 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
| 1128 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
| 1129 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
| 1130 | (parent == -1 || parent == c->mfc_parent)) { |
| 1131 | found = true; |
| 1132 | break; |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | if (found) { |
| 1137 | write_lock_bh(&mrt_lock); |
| 1138 | c->mfc_parent = mfc->mfcc_parent; |
| 1139 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
| 1140 | if (!mrtsock) |
| 1141 | c->mfc_flags |= MFC_STATIC; |
| 1142 | write_unlock_bh(&mrt_lock); |
| 1143 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
| 1147 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
| 1148 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
| 1149 | return -EINVAL; |
| 1150 | |
| 1151 | c = ipmr_cache_alloc(); |
| 1152 | if (!c) |
| 1153 | return -ENOMEM; |
| 1154 | |
| 1155 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
| 1156 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; |
| 1157 | c->mfc_parent = mfc->mfcc_parent; |
| 1158 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
| 1159 | if (!mrtsock) |
| 1160 | c->mfc_flags |= MFC_STATIC; |
| 1161 | |
| 1162 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); |
| 1163 | |
| 1164 | /* Check to see if we resolved a queued list. If so we |
| 1165 | * need to send on the frames and tidy up. |
| 1166 | */ |
| 1167 | found = false; |
| 1168 | spin_lock_bh(&mfc_unres_lock); |
| 1169 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
| 1170 | if (uc->mfc_origin == c->mfc_origin && |
| 1171 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
| 1172 | list_del(&uc->list); |
| 1173 | atomic_dec(&mrt->cache_resolve_queue_len); |
| 1174 | found = true; |
| 1175 | break; |
| 1176 | } |
| 1177 | } |
| 1178 | if (list_empty(&mrt->mfc_unres_queue)) |
| 1179 | del_timer(&mrt->ipmr_expire_timer); |
| 1180 | spin_unlock_bh(&mfc_unres_lock); |
| 1181 | |
| 1182 | if (found) { |
| 1183 | ipmr_cache_resolve(net, mrt, uc, c); |
| 1184 | ipmr_cache_free(uc); |
| 1185 | } |
| 1186 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
| 1187 | return 0; |
| 1188 | } |
| 1189 | |
| 1190 | /* Close the multicast socket, and clear the vif tables etc */ |
| 1191 | static void mroute_clean_tables(struct mr_table *mrt) |
| 1192 | { |
| 1193 | int i; |
| 1194 | LIST_HEAD(list); |
| 1195 | struct mfc_cache *c, *next; |
| 1196 | |
| 1197 | /* Shut down all active vif entries */ |
| 1198 | for (i = 0; i < mrt->maxvif; i++) { |
| 1199 | if (!(mrt->vif_table[i].flags & VIFF_STATIC)) |
| 1200 | vif_delete(mrt, i, 0, &list); |
| 1201 | } |
| 1202 | unregister_netdevice_many(&list); |
| 1203 | |
| 1204 | /* Wipe the cache */ |
| 1205 | for (i = 0; i < MFC_LINES; i++) { |
| 1206 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
| 1207 | if (c->mfc_flags & MFC_STATIC) |
| 1208 | continue; |
| 1209 | list_del_rcu(&c->list); |
| 1210 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
| 1211 | ipmr_cache_free(c); |
| 1212 | } |
| 1213 | } |
| 1214 | |
| 1215 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
| 1216 | spin_lock_bh(&mfc_unres_lock); |
| 1217 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
| 1218 | list_del(&c->list); |
| 1219 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
| 1220 | ipmr_destroy_unres(mrt, c); |
| 1221 | } |
| 1222 | spin_unlock_bh(&mfc_unres_lock); |
| 1223 | } |
| 1224 | } |
| 1225 | |
| 1226 | /* called from ip_ra_control(), before an RCU grace period, |
| 1227 | * we dont need to call synchronize_rcu() here |
| 1228 | */ |
| 1229 | static void mrtsock_destruct(struct sock *sk) |
| 1230 | { |
| 1231 | struct net *net = sock_net(sk); |
| 1232 | struct mr_table *mrt; |
| 1233 | |
| 1234 | rtnl_lock(); |
| 1235 | ipmr_for_each_table(mrt, net) { |
| 1236 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
| 1237 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
| 1238 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
| 1239 | NETCONFA_IFINDEX_ALL, |
| 1240 | net->ipv4.devconf_all); |
| 1241 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
| 1242 | mroute_clean_tables(mrt); |
| 1243 | } |
| 1244 | } |
| 1245 | rtnl_unlock(); |
| 1246 | } |
| 1247 | |
| 1248 | /* Socket options and virtual interface manipulation. The whole |
| 1249 | * virtual interface system is a complete heap, but unfortunately |
| 1250 | * that's how BSD mrouted happens to think. Maybe one day with a proper |
| 1251 | * MOSPF/PIM router set up we can clean this up. |
| 1252 | */ |
| 1253 | |
| 1254 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, |
| 1255 | unsigned int optlen) |
| 1256 | { |
| 1257 | struct net *net = sock_net(sk); |
| 1258 | int val, ret = 0, parent = 0; |
| 1259 | struct mr_table *mrt; |
| 1260 | struct vifctl vif; |
| 1261 | struct mfcctl mfc; |
| 1262 | u32 uval; |
| 1263 | |
| 1264 | /* There's one exception to the lock - MRT_DONE which needs to unlock */ |
| 1265 | rtnl_lock(); |
| 1266 | if (sk->sk_type != SOCK_RAW || |
| 1267 | inet_sk(sk)->inet_num != IPPROTO_IGMP) { |
| 1268 | ret = -EOPNOTSUPP; |
| 1269 | goto out_unlock; |
| 1270 | } |
| 1271 | |
| 1272 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
| 1273 | if (!mrt) { |
| 1274 | ret = -ENOENT; |
| 1275 | goto out_unlock; |
| 1276 | } |
| 1277 | if (optname != MRT_INIT) { |
| 1278 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
| 1279 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
| 1280 | ret = -EACCES; |
| 1281 | goto out_unlock; |
| 1282 | } |
| 1283 | } |
| 1284 | |
| 1285 | switch (optname) { |
| 1286 | case MRT_INIT: |
| 1287 | if (optlen != sizeof(int)) |
| 1288 | ret = -EINVAL; |
| 1289 | if (rtnl_dereference(mrt->mroute_sk)) |
| 1290 | ret = -EADDRINUSE; |
| 1291 | if (ret) |
| 1292 | break; |
| 1293 | |
| 1294 | ret = ip_ra_control(sk, 1, mrtsock_destruct); |
| 1295 | if (ret == 0) { |
| 1296 | rcu_assign_pointer(mrt->mroute_sk, sk); |
| 1297 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
| 1298 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
| 1299 | NETCONFA_IFINDEX_ALL, |
| 1300 | net->ipv4.devconf_all); |
| 1301 | } |
| 1302 | break; |
| 1303 | case MRT_DONE: |
| 1304 | if (sk != rcu_access_pointer(mrt->mroute_sk)) { |
| 1305 | ret = -EACCES; |
| 1306 | } else { |
| 1307 | /* We need to unlock here because mrtsock_destruct takes |
| 1308 | * care of rtnl itself and we can't change that due to |
| 1309 | * the IP_ROUTER_ALERT setsockopt which runs without it. |
| 1310 | */ |
| 1311 | rtnl_unlock(); |
| 1312 | ret = ip_ra_control(sk, 0, NULL); |
| 1313 | goto out; |
| 1314 | } |
| 1315 | break; |
| 1316 | case MRT_ADD_VIF: |
| 1317 | case MRT_DEL_VIF: |
| 1318 | if (optlen != sizeof(vif)) { |
| 1319 | ret = -EINVAL; |
| 1320 | break; |
| 1321 | } |
| 1322 | if (copy_from_user(&vif, optval, sizeof(vif))) { |
| 1323 | ret = -EFAULT; |
| 1324 | break; |
| 1325 | } |
| 1326 | if (vif.vifc_vifi >= MAXVIFS) { |
| 1327 | ret = -ENFILE; |
| 1328 | break; |
| 1329 | } |
| 1330 | if (optname == MRT_ADD_VIF) { |
| 1331 | ret = vif_add(net, mrt, &vif, |
| 1332 | sk == rtnl_dereference(mrt->mroute_sk)); |
| 1333 | } else { |
| 1334 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
| 1335 | } |
| 1336 | break; |
| 1337 | /* Manipulate the forwarding caches. These live |
| 1338 | * in a sort of kernel/user symbiosis. |
| 1339 | */ |
| 1340 | case MRT_ADD_MFC: |
| 1341 | case MRT_DEL_MFC: |
| 1342 | parent = -1; |
| 1343 | case MRT_ADD_MFC_PROXY: |
| 1344 | case MRT_DEL_MFC_PROXY: |
| 1345 | if (optlen != sizeof(mfc)) { |
| 1346 | ret = -EINVAL; |
| 1347 | break; |
| 1348 | } |
| 1349 | if (copy_from_user(&mfc, optval, sizeof(mfc))) { |
| 1350 | ret = -EFAULT; |
| 1351 | break; |
| 1352 | } |
| 1353 | if (parent == 0) |
| 1354 | parent = mfc.mfcc_parent; |
| 1355 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
| 1356 | ret = ipmr_mfc_delete(mrt, &mfc, parent); |
| 1357 | else |
| 1358 | ret = ipmr_mfc_add(net, mrt, &mfc, |
| 1359 | sk == rtnl_dereference(mrt->mroute_sk), |
| 1360 | parent); |
| 1361 | break; |
| 1362 | /* Control PIM assert. */ |
| 1363 | case MRT_ASSERT: |
| 1364 | if (optlen != sizeof(val)) { |
| 1365 | ret = -EINVAL; |
| 1366 | break; |
| 1367 | } |
| 1368 | if (get_user(val, (int __user *)optval)) { |
| 1369 | ret = -EFAULT; |
| 1370 | break; |
| 1371 | } |
| 1372 | mrt->mroute_do_assert = val; |
| 1373 | break; |
| 1374 | case MRT_PIM: |
| 1375 | if (!ipmr_pimsm_enabled()) { |
| 1376 | ret = -ENOPROTOOPT; |
| 1377 | break; |
| 1378 | } |
| 1379 | if (optlen != sizeof(val)) { |
| 1380 | ret = -EINVAL; |
| 1381 | break; |
| 1382 | } |
| 1383 | if (get_user(val, (int __user *)optval)) { |
| 1384 | ret = -EFAULT; |
| 1385 | break; |
| 1386 | } |
| 1387 | |
| 1388 | val = !!val; |
| 1389 | if (val != mrt->mroute_do_pim) { |
| 1390 | mrt->mroute_do_pim = val; |
| 1391 | mrt->mroute_do_assert = val; |
| 1392 | } |
| 1393 | break; |
| 1394 | case MRT_TABLE: |
| 1395 | if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) { |
| 1396 | ret = -ENOPROTOOPT; |
| 1397 | break; |
| 1398 | } |
| 1399 | if (optlen != sizeof(uval)) { |
| 1400 | ret = -EINVAL; |
| 1401 | break; |
| 1402 | } |
| 1403 | if (get_user(uval, (u32 __user *)optval)) { |
| 1404 | ret = -EFAULT; |
| 1405 | break; |
| 1406 | } |
| 1407 | |
| 1408 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
| 1409 | ret = -EBUSY; |
| 1410 | } else { |
| 1411 | mrt = ipmr_new_table(net, uval); |
| 1412 | if (IS_ERR(mrt)) |
| 1413 | ret = PTR_ERR(mrt); |
| 1414 | else |
| 1415 | raw_sk(sk)->ipmr_table = uval; |
| 1416 | } |
| 1417 | break; |
| 1418 | /* Spurious command, or MRT_VERSION which you cannot set. */ |
| 1419 | default: |
| 1420 | ret = -ENOPROTOOPT; |
| 1421 | } |
| 1422 | out_unlock: |
| 1423 | rtnl_unlock(); |
| 1424 | out: |
| 1425 | return ret; |
| 1426 | } |
| 1427 | |
| 1428 | /* Getsock opt support for the multicast routing system. */ |
| 1429 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
| 1430 | { |
| 1431 | int olr; |
| 1432 | int val; |
| 1433 | struct net *net = sock_net(sk); |
| 1434 | struct mr_table *mrt; |
| 1435 | |
| 1436 | if (sk->sk_type != SOCK_RAW || |
| 1437 | inet_sk(sk)->inet_num != IPPROTO_IGMP) |
| 1438 | return -EOPNOTSUPP; |
| 1439 | |
| 1440 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
| 1441 | if (!mrt) |
| 1442 | return -ENOENT; |
| 1443 | |
| 1444 | switch (optname) { |
| 1445 | case MRT_VERSION: |
| 1446 | val = 0x0305; |
| 1447 | break; |
| 1448 | case MRT_PIM: |
| 1449 | if (!ipmr_pimsm_enabled()) |
| 1450 | return -ENOPROTOOPT; |
| 1451 | val = mrt->mroute_do_pim; |
| 1452 | break; |
| 1453 | case MRT_ASSERT: |
| 1454 | val = mrt->mroute_do_assert; |
| 1455 | break; |
| 1456 | default: |
| 1457 | return -ENOPROTOOPT; |
| 1458 | } |
| 1459 | |
| 1460 | if (get_user(olr, optlen)) |
| 1461 | return -EFAULT; |
| 1462 | olr = min_t(unsigned int, olr, sizeof(int)); |
| 1463 | if (olr < 0) |
| 1464 | return -EINVAL; |
| 1465 | if (put_user(olr, optlen)) |
| 1466 | return -EFAULT; |
| 1467 | if (copy_to_user(optval, &val, olr)) |
| 1468 | return -EFAULT; |
| 1469 | return 0; |
| 1470 | } |
| 1471 | |
| 1472 | /* The IP multicast ioctl support routines. */ |
| 1473 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| 1474 | { |
| 1475 | struct sioc_sg_req sr; |
| 1476 | struct sioc_vif_req vr; |
| 1477 | struct vif_device *vif; |
| 1478 | struct mfc_cache *c; |
| 1479 | struct net *net = sock_net(sk); |
| 1480 | struct mr_table *mrt; |
| 1481 | |
| 1482 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
| 1483 | if (!mrt) |
| 1484 | return -ENOENT; |
| 1485 | |
| 1486 | switch (cmd) { |
| 1487 | case SIOCGETVIFCNT: |
| 1488 | if (copy_from_user(&vr, arg, sizeof(vr))) |
| 1489 | return -EFAULT; |
| 1490 | if (vr.vifi >= mrt->maxvif) |
| 1491 | return -EINVAL; |
| 1492 | read_lock(&mrt_lock); |
| 1493 | vif = &mrt->vif_table[vr.vifi]; |
| 1494 | if (VIF_EXISTS(mrt, vr.vifi)) { |
| 1495 | vr.icount = vif->pkt_in; |
| 1496 | vr.ocount = vif->pkt_out; |
| 1497 | vr.ibytes = vif->bytes_in; |
| 1498 | vr.obytes = vif->bytes_out; |
| 1499 | read_unlock(&mrt_lock); |
| 1500 | |
| 1501 | if (copy_to_user(arg, &vr, sizeof(vr))) |
| 1502 | return -EFAULT; |
| 1503 | return 0; |
| 1504 | } |
| 1505 | read_unlock(&mrt_lock); |
| 1506 | return -EADDRNOTAVAIL; |
| 1507 | case SIOCGETSGCNT: |
| 1508 | if (copy_from_user(&sr, arg, sizeof(sr))) |
| 1509 | return -EFAULT; |
| 1510 | |
| 1511 | rcu_read_lock(); |
| 1512 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
| 1513 | if (c) { |
| 1514 | sr.pktcnt = c->mfc_un.res.pkt; |
| 1515 | sr.bytecnt = c->mfc_un.res.bytes; |
| 1516 | sr.wrong_if = c->mfc_un.res.wrong_if; |
| 1517 | rcu_read_unlock(); |
| 1518 | |
| 1519 | if (copy_to_user(arg, &sr, sizeof(sr))) |
| 1520 | return -EFAULT; |
| 1521 | return 0; |
| 1522 | } |
| 1523 | rcu_read_unlock(); |
| 1524 | return -EADDRNOTAVAIL; |
| 1525 | default: |
| 1526 | return -ENOIOCTLCMD; |
| 1527 | } |
| 1528 | } |
| 1529 | |
| 1530 | #ifdef CONFIG_COMPAT |
| 1531 | struct compat_sioc_sg_req { |
| 1532 | struct in_addr src; |
| 1533 | struct in_addr grp; |
| 1534 | compat_ulong_t pktcnt; |
| 1535 | compat_ulong_t bytecnt; |
| 1536 | compat_ulong_t wrong_if; |
| 1537 | }; |
| 1538 | |
| 1539 | struct compat_sioc_vif_req { |
| 1540 | vifi_t vifi; /* Which iface */ |
| 1541 | compat_ulong_t icount; |
| 1542 | compat_ulong_t ocount; |
| 1543 | compat_ulong_t ibytes; |
| 1544 | compat_ulong_t obytes; |
| 1545 | }; |
| 1546 | |
| 1547 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
| 1548 | { |
| 1549 | struct compat_sioc_sg_req sr; |
| 1550 | struct compat_sioc_vif_req vr; |
| 1551 | struct vif_device *vif; |
| 1552 | struct mfc_cache *c; |
| 1553 | struct net *net = sock_net(sk); |
| 1554 | struct mr_table *mrt; |
| 1555 | |
| 1556 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
| 1557 | if (!mrt) |
| 1558 | return -ENOENT; |
| 1559 | |
| 1560 | switch (cmd) { |
| 1561 | case SIOCGETVIFCNT: |
| 1562 | if (copy_from_user(&vr, arg, sizeof(vr))) |
| 1563 | return -EFAULT; |
| 1564 | if (vr.vifi >= mrt->maxvif) |
| 1565 | return -EINVAL; |
| 1566 | read_lock(&mrt_lock); |
| 1567 | vif = &mrt->vif_table[vr.vifi]; |
| 1568 | if (VIF_EXISTS(mrt, vr.vifi)) { |
| 1569 | vr.icount = vif->pkt_in; |
| 1570 | vr.ocount = vif->pkt_out; |
| 1571 | vr.ibytes = vif->bytes_in; |
| 1572 | vr.obytes = vif->bytes_out; |
| 1573 | read_unlock(&mrt_lock); |
| 1574 | |
| 1575 | if (copy_to_user(arg, &vr, sizeof(vr))) |
| 1576 | return -EFAULT; |
| 1577 | return 0; |
| 1578 | } |
| 1579 | read_unlock(&mrt_lock); |
| 1580 | return -EADDRNOTAVAIL; |
| 1581 | case SIOCGETSGCNT: |
| 1582 | if (copy_from_user(&sr, arg, sizeof(sr))) |
| 1583 | return -EFAULT; |
| 1584 | |
| 1585 | rcu_read_lock(); |
| 1586 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
| 1587 | if (c) { |
| 1588 | sr.pktcnt = c->mfc_un.res.pkt; |
| 1589 | sr.bytecnt = c->mfc_un.res.bytes; |
| 1590 | sr.wrong_if = c->mfc_un.res.wrong_if; |
| 1591 | rcu_read_unlock(); |
| 1592 | |
| 1593 | if (copy_to_user(arg, &sr, sizeof(sr))) |
| 1594 | return -EFAULT; |
| 1595 | return 0; |
| 1596 | } |
| 1597 | rcu_read_unlock(); |
| 1598 | return -EADDRNOTAVAIL; |
| 1599 | default: |
| 1600 | return -ENOIOCTLCMD; |
| 1601 | } |
| 1602 | } |
| 1603 | #endif |
| 1604 | |
| 1605 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1606 | { |
| 1607 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 1608 | struct net *net = dev_net(dev); |
| 1609 | struct mr_table *mrt; |
| 1610 | struct vif_device *v; |
| 1611 | int ct; |
| 1612 | |
| 1613 | if (event != NETDEV_UNREGISTER) |
| 1614 | return NOTIFY_DONE; |
| 1615 | |
| 1616 | ipmr_for_each_table(mrt, net) { |
| 1617 | v = &mrt->vif_table[0]; |
| 1618 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { |
| 1619 | if (v->dev == dev) |
| 1620 | vif_delete(mrt, ct, 1, NULL); |
| 1621 | } |
| 1622 | } |
| 1623 | return NOTIFY_DONE; |
| 1624 | } |
| 1625 | |
| 1626 | static struct notifier_block ip_mr_notifier = { |
| 1627 | .notifier_call = ipmr_device_event, |
| 1628 | }; |
| 1629 | |
| 1630 | /* Encapsulate a packet by attaching a valid IPIP header to it. |
| 1631 | * This avoids tunnel drivers and other mess and gives us the speed so |
| 1632 | * important for multicast video. |
| 1633 | */ |
| 1634 | static void ip_encap(struct net *net, struct sk_buff *skb, |
| 1635 | __be32 saddr, __be32 daddr) |
| 1636 | { |
| 1637 | struct iphdr *iph; |
| 1638 | const struct iphdr *old_iph = ip_hdr(skb); |
| 1639 | |
| 1640 | skb_push(skb, sizeof(struct iphdr)); |
| 1641 | skb->transport_header = skb->network_header; |
| 1642 | skb_reset_network_header(skb); |
| 1643 | iph = ip_hdr(skb); |
| 1644 | |
| 1645 | iph->version = 4; |
| 1646 | iph->tos = old_iph->tos; |
| 1647 | iph->ttl = old_iph->ttl; |
| 1648 | iph->frag_off = 0; |
| 1649 | iph->daddr = daddr; |
| 1650 | iph->saddr = saddr; |
| 1651 | iph->protocol = IPPROTO_IPIP; |
| 1652 | iph->ihl = 5; |
| 1653 | iph->tot_len = htons(skb->len); |
| 1654 | ip_select_ident(net, skb, NULL); |
| 1655 | ip_send_check(iph); |
| 1656 | |
| 1657 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| 1658 | nf_reset(skb); |
| 1659 | } |
| 1660 | |
| 1661 | static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
| 1662 | struct sk_buff *skb) |
| 1663 | { |
| 1664 | struct ip_options *opt = &(IPCB(skb)->opt); |
| 1665 | |
| 1666 | IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
| 1667 | IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); |
| 1668 | |
| 1669 | if (unlikely(opt->optlen)) |
| 1670 | ip_forward_options(skb); |
| 1671 | |
| 1672 | return dst_output(net, sk, skb); |
| 1673 | } |
| 1674 | |
| 1675 | /* Processing handlers for ipmr_forward */ |
| 1676 | |
| 1677 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
| 1678 | struct sk_buff *skb, struct mfc_cache *c, int vifi) |
| 1679 | { |
| 1680 | const struct iphdr *iph = ip_hdr(skb); |
| 1681 | struct vif_device *vif = &mrt->vif_table[vifi]; |
| 1682 | struct net_device *dev; |
| 1683 | struct rtable *rt; |
| 1684 | struct flowi4 fl4; |
| 1685 | int encap = 0; |
| 1686 | |
| 1687 | if (!vif->dev) |
| 1688 | goto out_free; |
| 1689 | |
| 1690 | if (vif->flags & VIFF_REGISTER) { |
| 1691 | vif->pkt_out++; |
| 1692 | vif->bytes_out += skb->len; |
| 1693 | vif->dev->stats.tx_bytes += skb->len; |
| 1694 | vif->dev->stats.tx_packets++; |
| 1695 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
| 1696 | goto out_free; |
| 1697 | } |
| 1698 | |
| 1699 | if (vif->flags & VIFF_TUNNEL) { |
| 1700 | rt = ip_route_output_ports(net, &fl4, NULL, |
| 1701 | vif->remote, vif->local, |
| 1702 | 0, 0, |
| 1703 | IPPROTO_IPIP, |
| 1704 | RT_TOS(iph->tos), vif->link); |
| 1705 | if (IS_ERR(rt)) |
| 1706 | goto out_free; |
| 1707 | encap = sizeof(struct iphdr); |
| 1708 | } else { |
| 1709 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
| 1710 | 0, 0, |
| 1711 | IPPROTO_IPIP, |
| 1712 | RT_TOS(iph->tos), vif->link); |
| 1713 | if (IS_ERR(rt)) |
| 1714 | goto out_free; |
| 1715 | } |
| 1716 | |
| 1717 | dev = rt->dst.dev; |
| 1718 | |
| 1719 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
| 1720 | /* Do not fragment multicasts. Alas, IPv4 does not |
| 1721 | * allow to send ICMP, so that packets will disappear |
| 1722 | * to blackhole. |
| 1723 | */ |
| 1724 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
| 1725 | ip_rt_put(rt); |
| 1726 | goto out_free; |
| 1727 | } |
| 1728 | |
| 1729 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
| 1730 | |
| 1731 | if (skb_cow(skb, encap)) { |
| 1732 | ip_rt_put(rt); |
| 1733 | goto out_free; |
| 1734 | } |
| 1735 | |
| 1736 | vif->pkt_out++; |
| 1737 | vif->bytes_out += skb->len; |
| 1738 | |
| 1739 | skb_dst_drop(skb); |
| 1740 | skb_dst_set(skb, &rt->dst); |
| 1741 | ip_decrease_ttl(ip_hdr(skb)); |
| 1742 | |
| 1743 | /* FIXME: forward and output firewalls used to be called here. |
| 1744 | * What do we do with netfilter? -- RR |
| 1745 | */ |
| 1746 | if (vif->flags & VIFF_TUNNEL) { |
| 1747 | ip_encap(net, skb, vif->local, vif->remote); |
| 1748 | /* FIXME: extra output firewall step used to be here. --RR */ |
| 1749 | vif->dev->stats.tx_packets++; |
| 1750 | vif->dev->stats.tx_bytes += skb->len; |
| 1751 | } |
| 1752 | |
| 1753 | IPCB(skb)->flags |= IPSKB_FORWARDED; |
| 1754 | |
| 1755 | /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
| 1756 | * not only before forwarding, but after forwarding on all output |
| 1757 | * interfaces. It is clear, if mrouter runs a multicasting |
| 1758 | * program, it should receive packets not depending to what interface |
| 1759 | * program is joined. |
| 1760 | * If we will not make it, the program will have to join on all |
| 1761 | * interfaces. On the other hand, multihoming host (or router, but |
| 1762 | * not mrouter) cannot join to more than one interface - it will |
| 1763 | * result in receiving multiple packets. |
| 1764 | */ |
| 1765 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, |
| 1766 | net, NULL, skb, skb->dev, dev, |
| 1767 | ipmr_forward_finish); |
| 1768 | return; |
| 1769 | |
| 1770 | out_free: |
| 1771 | kfree_skb(skb); |
| 1772 | } |
| 1773 | |
| 1774 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
| 1775 | { |
| 1776 | int ct; |
| 1777 | |
| 1778 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { |
| 1779 | if (mrt->vif_table[ct].dev == dev) |
| 1780 | break; |
| 1781 | } |
| 1782 | return ct; |
| 1783 | } |
| 1784 | |
| 1785 | /* "local" means that we should preserve one skb (for local delivery) */ |
| 1786 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
| 1787 | struct sk_buff *skb, struct mfc_cache *cache, |
| 1788 | int local) |
| 1789 | { |
| 1790 | int psend = -1; |
| 1791 | int vif, ct; |
| 1792 | int true_vifi = ipmr_find_vif(mrt, skb->dev); |
| 1793 | |
| 1794 | vif = cache->mfc_parent; |
| 1795 | cache->mfc_un.res.pkt++; |
| 1796 | cache->mfc_un.res.bytes += skb->len; |
| 1797 | |
| 1798 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
| 1799 | struct mfc_cache *cache_proxy; |
| 1800 | |
| 1801 | /* For an (*,G) entry, we only check that the incomming |
| 1802 | * interface is part of the static tree. |
| 1803 | */ |
| 1804 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); |
| 1805 | if (cache_proxy && |
| 1806 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) |
| 1807 | goto forward; |
| 1808 | } |
| 1809 | |
| 1810 | /* Wrong interface: drop packet and (maybe) send PIM assert. */ |
| 1811 | if (mrt->vif_table[vif].dev != skb->dev) { |
| 1812 | if (rt_is_output_route(skb_rtable(skb))) { |
| 1813 | /* It is our own packet, looped back. |
| 1814 | * Very complicated situation... |
| 1815 | * |
| 1816 | * The best workaround until routing daemons will be |
| 1817 | * fixed is not to redistribute packet, if it was |
| 1818 | * send through wrong interface. It means, that |
| 1819 | * multicast applications WILL NOT work for |
| 1820 | * (S,G), which have default multicast route pointing |
| 1821 | * to wrong oif. In any case, it is not a good |
| 1822 | * idea to use multicasting applications on router. |
| 1823 | */ |
| 1824 | goto dont_forward; |
| 1825 | } |
| 1826 | |
| 1827 | cache->mfc_un.res.wrong_if++; |
| 1828 | |
| 1829 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
| 1830 | /* pimsm uses asserts, when switching from RPT to SPT, |
| 1831 | * so that we cannot check that packet arrived on an oif. |
| 1832 | * It is bad, but otherwise we would need to move pretty |
| 1833 | * large chunk of pimd to kernel. Ough... --ANK |
| 1834 | */ |
| 1835 | (mrt->mroute_do_pim || |
| 1836 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
| 1837 | time_after(jiffies, |
| 1838 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
| 1839 | cache->mfc_un.res.last_assert = jiffies; |
| 1840 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
| 1841 | } |
| 1842 | goto dont_forward; |
| 1843 | } |
| 1844 | |
| 1845 | forward: |
| 1846 | mrt->vif_table[vif].pkt_in++; |
| 1847 | mrt->vif_table[vif].bytes_in += skb->len; |
| 1848 | |
| 1849 | /* Forward the frame */ |
| 1850 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
| 1851 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { |
| 1852 | if (true_vifi >= 0 && |
| 1853 | true_vifi != cache->mfc_parent && |
| 1854 | ip_hdr(skb)->ttl > |
| 1855 | cache->mfc_un.res.ttls[cache->mfc_parent]) { |
| 1856 | /* It's an (*,*) entry and the packet is not coming from |
| 1857 | * the upstream: forward the packet to the upstream |
| 1858 | * only. |
| 1859 | */ |
| 1860 | psend = cache->mfc_parent; |
| 1861 | goto last_forward; |
| 1862 | } |
| 1863 | goto dont_forward; |
| 1864 | } |
| 1865 | for (ct = cache->mfc_un.res.maxvif - 1; |
| 1866 | ct >= cache->mfc_un.res.minvif; ct--) { |
| 1867 | /* For (*,G) entry, don't forward to the incoming interface */ |
| 1868 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
| 1869 | ct != true_vifi) && |
| 1870 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
| 1871 | if (psend != -1) { |
| 1872 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1873 | |
| 1874 | if (skb2) |
| 1875 | ipmr_queue_xmit(net, mrt, skb2, cache, |
| 1876 | psend); |
| 1877 | } |
| 1878 | psend = ct; |
| 1879 | } |
| 1880 | } |
| 1881 | last_forward: |
| 1882 | if (psend != -1) { |
| 1883 | if (local) { |
| 1884 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1885 | |
| 1886 | if (skb2) |
| 1887 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
| 1888 | } else { |
| 1889 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
| 1890 | return; |
| 1891 | } |
| 1892 | } |
| 1893 | |
| 1894 | dont_forward: |
| 1895 | if (!local) |
| 1896 | kfree_skb(skb); |
| 1897 | } |
| 1898 | |
| 1899 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
| 1900 | { |
| 1901 | struct rtable *rt = skb_rtable(skb); |
| 1902 | struct iphdr *iph = ip_hdr(skb); |
| 1903 | struct flowi4 fl4 = { |
| 1904 | .daddr = iph->daddr, |
| 1905 | .saddr = iph->saddr, |
| 1906 | .flowi4_tos = RT_TOS(iph->tos), |
| 1907 | .flowi4_oif = (rt_is_output_route(rt) ? |
| 1908 | skb->dev->ifindex : 0), |
| 1909 | .flowi4_iif = (rt_is_output_route(rt) ? |
| 1910 | LOOPBACK_IFINDEX : |
| 1911 | skb->dev->ifindex), |
| 1912 | .flowi4_mark = skb->mark, |
| 1913 | }; |
| 1914 | struct mr_table *mrt; |
| 1915 | int err; |
| 1916 | |
| 1917 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
| 1918 | if (err) |
| 1919 | return ERR_PTR(err); |
| 1920 | return mrt; |
| 1921 | } |
| 1922 | |
| 1923 | /* Multicast packets for forwarding arrive here |
| 1924 | * Called with rcu_read_lock(); |
| 1925 | */ |
| 1926 | int ip_mr_input(struct sk_buff *skb) |
| 1927 | { |
| 1928 | struct mfc_cache *cache; |
| 1929 | struct net *net = dev_net(skb->dev); |
| 1930 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
| 1931 | struct mr_table *mrt; |
| 1932 | |
| 1933 | /* Packet is looped back after forward, it should not be |
| 1934 | * forwarded second time, but still can be delivered locally. |
| 1935 | */ |
| 1936 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
| 1937 | goto dont_forward; |
| 1938 | |
| 1939 | mrt = ipmr_rt_fib_lookup(net, skb); |
| 1940 | if (IS_ERR(mrt)) { |
| 1941 | kfree_skb(skb); |
| 1942 | return PTR_ERR(mrt); |
| 1943 | } |
| 1944 | if (!local) { |
| 1945 | if (IPCB(skb)->opt.router_alert) { |
| 1946 | if (ip_call_ra_chain(skb)) |
| 1947 | return 0; |
| 1948 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { |
| 1949 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
| 1950 | * Cisco IOS <= 11.2(8)) do not put router alert |
| 1951 | * option to IGMP packets destined to routable |
| 1952 | * groups. It is very bad, because it means |
| 1953 | * that we can forward NO IGMP messages. |
| 1954 | */ |
| 1955 | struct sock *mroute_sk; |
| 1956 | |
| 1957 | mroute_sk = rcu_dereference(mrt->mroute_sk); |
| 1958 | if (mroute_sk) { |
| 1959 | nf_reset(skb); |
| 1960 | raw_rcv(mroute_sk, skb); |
| 1961 | return 0; |
| 1962 | } |
| 1963 | } |
| 1964 | } |
| 1965 | |
| 1966 | /* already under rcu_read_lock() */ |
| 1967 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
| 1968 | if (!cache) { |
| 1969 | int vif = ipmr_find_vif(mrt, skb->dev); |
| 1970 | |
| 1971 | if (vif >= 0) |
| 1972 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, |
| 1973 | vif); |
| 1974 | } |
| 1975 | |
| 1976 | /* No usable cache entry */ |
| 1977 | if (!cache) { |
| 1978 | int vif; |
| 1979 | |
| 1980 | if (local) { |
| 1981 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1982 | ip_local_deliver(skb); |
| 1983 | if (!skb2) |
| 1984 | return -ENOBUFS; |
| 1985 | skb = skb2; |
| 1986 | } |
| 1987 | |
| 1988 | read_lock(&mrt_lock); |
| 1989 | vif = ipmr_find_vif(mrt, skb->dev); |
| 1990 | if (vif >= 0) { |
| 1991 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
| 1992 | read_unlock(&mrt_lock); |
| 1993 | |
| 1994 | return err2; |
| 1995 | } |
| 1996 | read_unlock(&mrt_lock); |
| 1997 | kfree_skb(skb); |
| 1998 | return -ENODEV; |
| 1999 | } |
| 2000 | |
| 2001 | read_lock(&mrt_lock); |
| 2002 | ip_mr_forward(net, mrt, skb, cache, local); |
| 2003 | read_unlock(&mrt_lock); |
| 2004 | |
| 2005 | if (local) |
| 2006 | return ip_local_deliver(skb); |
| 2007 | |
| 2008 | return 0; |
| 2009 | |
| 2010 | dont_forward: |
| 2011 | if (local) |
| 2012 | return ip_local_deliver(skb); |
| 2013 | kfree_skb(skb); |
| 2014 | return 0; |
| 2015 | } |
| 2016 | |
| 2017 | #ifdef CONFIG_IP_PIMSM_V1 |
| 2018 | /* Handle IGMP messages of PIMv1 */ |
| 2019 | int pim_rcv_v1(struct sk_buff *skb) |
| 2020 | { |
| 2021 | struct igmphdr *pim; |
| 2022 | struct net *net = dev_net(skb->dev); |
| 2023 | struct mr_table *mrt; |
| 2024 | |
| 2025 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
| 2026 | goto drop; |
| 2027 | |
| 2028 | pim = igmp_hdr(skb); |
| 2029 | |
| 2030 | mrt = ipmr_rt_fib_lookup(net, skb); |
| 2031 | if (IS_ERR(mrt)) |
| 2032 | goto drop; |
| 2033 | if (!mrt->mroute_do_pim || |
| 2034 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
| 2035 | goto drop; |
| 2036 | |
| 2037 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
| 2038 | drop: |
| 2039 | kfree_skb(skb); |
| 2040 | } |
| 2041 | return 0; |
| 2042 | } |
| 2043 | #endif |
| 2044 | |
| 2045 | #ifdef CONFIG_IP_PIMSM_V2 |
| 2046 | static int pim_rcv(struct sk_buff *skb) |
| 2047 | { |
| 2048 | struct pimreghdr *pim; |
| 2049 | struct net *net = dev_net(skb->dev); |
| 2050 | struct mr_table *mrt; |
| 2051 | |
| 2052 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
| 2053 | goto drop; |
| 2054 | |
| 2055 | pim = (struct pimreghdr *)skb_transport_header(skb); |
| 2056 | if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || |
| 2057 | (pim->flags & PIM_NULL_REGISTER) || |
| 2058 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
| 2059 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
| 2060 | goto drop; |
| 2061 | |
| 2062 | mrt = ipmr_rt_fib_lookup(net, skb); |
| 2063 | if (IS_ERR(mrt)) |
| 2064 | goto drop; |
| 2065 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
| 2066 | drop: |
| 2067 | kfree_skb(skb); |
| 2068 | } |
| 2069 | return 0; |
| 2070 | } |
| 2071 | #endif |
| 2072 | |
| 2073 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
| 2074 | struct mfc_cache *c, struct rtmsg *rtm) |
| 2075 | { |
| 2076 | int ct; |
| 2077 | struct rtnexthop *nhp; |
| 2078 | struct nlattr *mp_attr; |
| 2079 | struct rta_mfc_stats mfcs; |
| 2080 | |
| 2081 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
| 2082 | if (c->mfc_parent >= MAXVIFS) |
| 2083 | return -ENOENT; |
| 2084 | |
| 2085 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
| 2086 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) |
| 2087 | return -EMSGSIZE; |
| 2088 | |
| 2089 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
| 2090 | return -EMSGSIZE; |
| 2091 | |
| 2092 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| 2093 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
| 2094 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
| 2095 | nla_nest_cancel(skb, mp_attr); |
| 2096 | return -EMSGSIZE; |
| 2097 | } |
| 2098 | |
| 2099 | nhp->rtnh_flags = 0; |
| 2100 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
| 2101 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
| 2102 | nhp->rtnh_len = sizeof(*nhp); |
| 2103 | } |
| 2104 | } |
| 2105 | |
| 2106 | nla_nest_end(skb, mp_attr); |
| 2107 | |
| 2108 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
| 2109 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; |
| 2110 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; |
| 2111 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) |
| 2112 | return -EMSGSIZE; |
| 2113 | |
| 2114 | rtm->rtm_type = RTN_MULTICAST; |
| 2115 | return 1; |
| 2116 | } |
| 2117 | |
| 2118 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
| 2119 | __be32 saddr, __be32 daddr, |
| 2120 | struct rtmsg *rtm, int nowait) |
| 2121 | { |
| 2122 | struct mfc_cache *cache; |
| 2123 | struct mr_table *mrt; |
| 2124 | int err; |
| 2125 | |
| 2126 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
| 2127 | if (!mrt) |
| 2128 | return -ENOENT; |
| 2129 | |
| 2130 | rcu_read_lock(); |
| 2131 | cache = ipmr_cache_find(mrt, saddr, daddr); |
| 2132 | if (!cache && skb->dev) { |
| 2133 | int vif = ipmr_find_vif(mrt, skb->dev); |
| 2134 | |
| 2135 | if (vif >= 0) |
| 2136 | cache = ipmr_cache_find_any(mrt, daddr, vif); |
| 2137 | } |
| 2138 | if (!cache) { |
| 2139 | struct sk_buff *skb2; |
| 2140 | struct iphdr *iph; |
| 2141 | struct net_device *dev; |
| 2142 | int vif = -1; |
| 2143 | |
| 2144 | if (nowait) { |
| 2145 | rcu_read_unlock(); |
| 2146 | return -EAGAIN; |
| 2147 | } |
| 2148 | |
| 2149 | dev = skb->dev; |
| 2150 | read_lock(&mrt_lock); |
| 2151 | if (dev) |
| 2152 | vif = ipmr_find_vif(mrt, dev); |
| 2153 | if (vif < 0) { |
| 2154 | read_unlock(&mrt_lock); |
| 2155 | rcu_read_unlock(); |
| 2156 | return -ENODEV; |
| 2157 | } |
| 2158 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 2159 | if (!skb2) { |
| 2160 | read_unlock(&mrt_lock); |
| 2161 | rcu_read_unlock(); |
| 2162 | return -ENOMEM; |
| 2163 | } |
| 2164 | |
| 2165 | skb_push(skb2, sizeof(struct iphdr)); |
| 2166 | skb_reset_network_header(skb2); |
| 2167 | iph = ip_hdr(skb2); |
| 2168 | iph->ihl = sizeof(struct iphdr) >> 2; |
| 2169 | iph->saddr = saddr; |
| 2170 | iph->daddr = daddr; |
| 2171 | iph->version = 0; |
| 2172 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
| 2173 | read_unlock(&mrt_lock); |
| 2174 | rcu_read_unlock(); |
| 2175 | return err; |
| 2176 | } |
| 2177 | |
| 2178 | read_lock(&mrt_lock); |
| 2179 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
| 2180 | read_unlock(&mrt_lock); |
| 2181 | rcu_read_unlock(); |
| 2182 | return err; |
| 2183 | } |
| 2184 | |
| 2185 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
| 2186 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
| 2187 | int flags) |
| 2188 | { |
| 2189 | struct nlmsghdr *nlh; |
| 2190 | struct rtmsg *rtm; |
| 2191 | int err; |
| 2192 | |
| 2193 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
| 2194 | if (!nlh) |
| 2195 | return -EMSGSIZE; |
| 2196 | |
| 2197 | rtm = nlmsg_data(nlh); |
| 2198 | rtm->rtm_family = RTNL_FAMILY_IPMR; |
| 2199 | rtm->rtm_dst_len = 32; |
| 2200 | rtm->rtm_src_len = 32; |
| 2201 | rtm->rtm_tos = 0; |
| 2202 | rtm->rtm_table = mrt->id; |
| 2203 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
| 2204 | goto nla_put_failure; |
| 2205 | rtm->rtm_type = RTN_MULTICAST; |
| 2206 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2207 | if (c->mfc_flags & MFC_STATIC) |
| 2208 | rtm->rtm_protocol = RTPROT_STATIC; |
| 2209 | else |
| 2210 | rtm->rtm_protocol = RTPROT_MROUTED; |
| 2211 | rtm->rtm_flags = 0; |
| 2212 | |
| 2213 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
| 2214 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) |
| 2215 | goto nla_put_failure; |
| 2216 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
| 2217 | /* do not break the dump if cache is unresolved */ |
| 2218 | if (err < 0 && err != -ENOENT) |
| 2219 | goto nla_put_failure; |
| 2220 | |
| 2221 | nlmsg_end(skb, nlh); |
| 2222 | return 0; |
| 2223 | |
| 2224 | nla_put_failure: |
| 2225 | nlmsg_cancel(skb, nlh); |
| 2226 | return -EMSGSIZE; |
| 2227 | } |
| 2228 | |
| 2229 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
| 2230 | { |
| 2231 | size_t len = |
| 2232 | NLMSG_ALIGN(sizeof(struct rtmsg)) |
| 2233 | + nla_total_size(4) /* RTA_TABLE */ |
| 2234 | + nla_total_size(4) /* RTA_SRC */ |
| 2235 | + nla_total_size(4) /* RTA_DST */ |
| 2236 | ; |
| 2237 | |
| 2238 | if (!unresolved) |
| 2239 | len = len |
| 2240 | + nla_total_size(4) /* RTA_IIF */ |
| 2241 | + nla_total_size(0) /* RTA_MULTIPATH */ |
| 2242 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) |
| 2243 | /* RTA_MFC_STATS */ |
| 2244 | + nla_total_size(sizeof(struct rta_mfc_stats)) |
| 2245 | ; |
| 2246 | |
| 2247 | return len; |
| 2248 | } |
| 2249 | |
| 2250 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
| 2251 | int cmd) |
| 2252 | { |
| 2253 | struct net *net = read_pnet(&mrt->net); |
| 2254 | struct sk_buff *skb; |
| 2255 | int err = -ENOBUFS; |
| 2256 | |
| 2257 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), |
| 2258 | GFP_ATOMIC); |
| 2259 | if (!skb) |
| 2260 | goto errout; |
| 2261 | |
| 2262 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
| 2263 | if (err < 0) |
| 2264 | goto errout; |
| 2265 | |
| 2266 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); |
| 2267 | return; |
| 2268 | |
| 2269 | errout: |
| 2270 | kfree_skb(skb); |
| 2271 | if (err < 0) |
| 2272 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); |
| 2273 | } |
| 2274 | |
| 2275 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
| 2276 | { |
| 2277 | struct net *net = sock_net(skb->sk); |
| 2278 | struct mr_table *mrt; |
| 2279 | struct mfc_cache *mfc; |
| 2280 | unsigned int t = 0, s_t; |
| 2281 | unsigned int h = 0, s_h; |
| 2282 | unsigned int e = 0, s_e; |
| 2283 | |
| 2284 | s_t = cb->args[0]; |
| 2285 | s_h = cb->args[1]; |
| 2286 | s_e = cb->args[2]; |
| 2287 | |
| 2288 | rcu_read_lock(); |
| 2289 | ipmr_for_each_table(mrt, net) { |
| 2290 | if (t < s_t) |
| 2291 | goto next_table; |
| 2292 | if (t > s_t) |
| 2293 | s_h = 0; |
| 2294 | for (h = s_h; h < MFC_LINES; h++) { |
| 2295 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { |
| 2296 | if (e < s_e) |
| 2297 | goto next_entry; |
| 2298 | if (ipmr_fill_mroute(mrt, skb, |
| 2299 | NETLINK_CB(cb->skb).portid, |
| 2300 | cb->nlh->nlmsg_seq, |
| 2301 | mfc, RTM_NEWROUTE, |
| 2302 | NLM_F_MULTI) < 0) |
| 2303 | goto done; |
| 2304 | next_entry: |
| 2305 | e++; |
| 2306 | } |
| 2307 | e = s_e = 0; |
| 2308 | } |
| 2309 | spin_lock_bh(&mfc_unres_lock); |
| 2310 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { |
| 2311 | if (e < s_e) |
| 2312 | goto next_entry2; |
| 2313 | if (ipmr_fill_mroute(mrt, skb, |
| 2314 | NETLINK_CB(cb->skb).portid, |
| 2315 | cb->nlh->nlmsg_seq, |
| 2316 | mfc, RTM_NEWROUTE, |
| 2317 | NLM_F_MULTI) < 0) { |
| 2318 | spin_unlock_bh(&mfc_unres_lock); |
| 2319 | goto done; |
| 2320 | } |
| 2321 | next_entry2: |
| 2322 | e++; |
| 2323 | } |
| 2324 | spin_unlock_bh(&mfc_unres_lock); |
| 2325 | e = s_e = 0; |
| 2326 | s_h = 0; |
| 2327 | next_table: |
| 2328 | t++; |
| 2329 | } |
| 2330 | done: |
| 2331 | rcu_read_unlock(); |
| 2332 | |
| 2333 | cb->args[2] = e; |
| 2334 | cb->args[1] = h; |
| 2335 | cb->args[0] = t; |
| 2336 | |
| 2337 | return skb->len; |
| 2338 | } |
| 2339 | |
| 2340 | #ifdef CONFIG_PROC_FS |
| 2341 | /* The /proc interfaces to multicast routing : |
| 2342 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif |
| 2343 | */ |
| 2344 | struct ipmr_vif_iter { |
| 2345 | struct seq_net_private p; |
| 2346 | struct mr_table *mrt; |
| 2347 | int ct; |
| 2348 | }; |
| 2349 | |
| 2350 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
| 2351 | struct ipmr_vif_iter *iter, |
| 2352 | loff_t pos) |
| 2353 | { |
| 2354 | struct mr_table *mrt = iter->mrt; |
| 2355 | |
| 2356 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { |
| 2357 | if (!VIF_EXISTS(mrt, iter->ct)) |
| 2358 | continue; |
| 2359 | if (pos-- == 0) |
| 2360 | return &mrt->vif_table[iter->ct]; |
| 2361 | } |
| 2362 | return NULL; |
| 2363 | } |
| 2364 | |
| 2365 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
| 2366 | __acquires(mrt_lock) |
| 2367 | { |
| 2368 | struct ipmr_vif_iter *iter = seq->private; |
| 2369 | struct net *net = seq_file_net(seq); |
| 2370 | struct mr_table *mrt; |
| 2371 | |
| 2372 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
| 2373 | if (!mrt) |
| 2374 | return ERR_PTR(-ENOENT); |
| 2375 | |
| 2376 | iter->mrt = mrt; |
| 2377 | |
| 2378 | read_lock(&mrt_lock); |
| 2379 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
| 2380 | : SEQ_START_TOKEN; |
| 2381 | } |
| 2382 | |
| 2383 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2384 | { |
| 2385 | struct ipmr_vif_iter *iter = seq->private; |
| 2386 | struct net *net = seq_file_net(seq); |
| 2387 | struct mr_table *mrt = iter->mrt; |
| 2388 | |
| 2389 | ++*pos; |
| 2390 | if (v == SEQ_START_TOKEN) |
| 2391 | return ipmr_vif_seq_idx(net, iter, 0); |
| 2392 | |
| 2393 | while (++iter->ct < mrt->maxvif) { |
| 2394 | if (!VIF_EXISTS(mrt, iter->ct)) |
| 2395 | continue; |
| 2396 | return &mrt->vif_table[iter->ct]; |
| 2397 | } |
| 2398 | return NULL; |
| 2399 | } |
| 2400 | |
| 2401 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) |
| 2402 | __releases(mrt_lock) |
| 2403 | { |
| 2404 | read_unlock(&mrt_lock); |
| 2405 | } |
| 2406 | |
| 2407 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) |
| 2408 | { |
| 2409 | struct ipmr_vif_iter *iter = seq->private; |
| 2410 | struct mr_table *mrt = iter->mrt; |
| 2411 | |
| 2412 | if (v == SEQ_START_TOKEN) { |
| 2413 | seq_puts(seq, |
| 2414 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
| 2415 | } else { |
| 2416 | const struct vif_device *vif = v; |
| 2417 | const char *name = vif->dev ? vif->dev->name : "none"; |
| 2418 | |
| 2419 | seq_printf(seq, |
| 2420 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
| 2421 | vif - mrt->vif_table, |
| 2422 | name, vif->bytes_in, vif->pkt_in, |
| 2423 | vif->bytes_out, vif->pkt_out, |
| 2424 | vif->flags, vif->local, vif->remote); |
| 2425 | } |
| 2426 | return 0; |
| 2427 | } |
| 2428 | |
| 2429 | static const struct seq_operations ipmr_vif_seq_ops = { |
| 2430 | .start = ipmr_vif_seq_start, |
| 2431 | .next = ipmr_vif_seq_next, |
| 2432 | .stop = ipmr_vif_seq_stop, |
| 2433 | .show = ipmr_vif_seq_show, |
| 2434 | }; |
| 2435 | |
| 2436 | static int ipmr_vif_open(struct inode *inode, struct file *file) |
| 2437 | { |
| 2438 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
| 2439 | sizeof(struct ipmr_vif_iter)); |
| 2440 | } |
| 2441 | |
| 2442 | static const struct file_operations ipmr_vif_fops = { |
| 2443 | .owner = THIS_MODULE, |
| 2444 | .open = ipmr_vif_open, |
| 2445 | .read = seq_read, |
| 2446 | .llseek = seq_lseek, |
| 2447 | .release = seq_release_net, |
| 2448 | }; |
| 2449 | |
| 2450 | struct ipmr_mfc_iter { |
| 2451 | struct seq_net_private p; |
| 2452 | struct mr_table *mrt; |
| 2453 | struct list_head *cache; |
| 2454 | int ct; |
| 2455 | }; |
| 2456 | |
| 2457 | |
| 2458 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
| 2459 | struct ipmr_mfc_iter *it, loff_t pos) |
| 2460 | { |
| 2461 | struct mr_table *mrt = it->mrt; |
| 2462 | struct mfc_cache *mfc; |
| 2463 | |
| 2464 | rcu_read_lock(); |
| 2465 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
| 2466 | it->cache = &mrt->mfc_cache_array[it->ct]; |
| 2467 | list_for_each_entry_rcu(mfc, it->cache, list) |
| 2468 | if (pos-- == 0) |
| 2469 | return mfc; |
| 2470 | } |
| 2471 | rcu_read_unlock(); |
| 2472 | |
| 2473 | spin_lock_bh(&mfc_unres_lock); |
| 2474 | it->cache = &mrt->mfc_unres_queue; |
| 2475 | list_for_each_entry(mfc, it->cache, list) |
| 2476 | if (pos-- == 0) |
| 2477 | return mfc; |
| 2478 | spin_unlock_bh(&mfc_unres_lock); |
| 2479 | |
| 2480 | it->cache = NULL; |
| 2481 | return NULL; |
| 2482 | } |
| 2483 | |
| 2484 | |
| 2485 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
| 2486 | { |
| 2487 | struct ipmr_mfc_iter *it = seq->private; |
| 2488 | struct net *net = seq_file_net(seq); |
| 2489 | struct mr_table *mrt; |
| 2490 | |
| 2491 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
| 2492 | if (!mrt) |
| 2493 | return ERR_PTR(-ENOENT); |
| 2494 | |
| 2495 | it->mrt = mrt; |
| 2496 | it->cache = NULL; |
| 2497 | it->ct = 0; |
| 2498 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
| 2499 | : SEQ_START_TOKEN; |
| 2500 | } |
| 2501 | |
| 2502 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2503 | { |
| 2504 | struct mfc_cache *mfc = v; |
| 2505 | struct ipmr_mfc_iter *it = seq->private; |
| 2506 | struct net *net = seq_file_net(seq); |
| 2507 | struct mr_table *mrt = it->mrt; |
| 2508 | |
| 2509 | ++*pos; |
| 2510 | |
| 2511 | if (v == SEQ_START_TOKEN) |
| 2512 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
| 2513 | |
| 2514 | if (mfc->list.next != it->cache) |
| 2515 | return list_entry(mfc->list.next, struct mfc_cache, list); |
| 2516 | |
| 2517 | if (it->cache == &mrt->mfc_unres_queue) |
| 2518 | goto end_of_list; |
| 2519 | |
| 2520 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
| 2521 | |
| 2522 | while (++it->ct < MFC_LINES) { |
| 2523 | it->cache = &mrt->mfc_cache_array[it->ct]; |
| 2524 | if (list_empty(it->cache)) |
| 2525 | continue; |
| 2526 | return list_first_entry(it->cache, struct mfc_cache, list); |
| 2527 | } |
| 2528 | |
| 2529 | /* exhausted cache_array, show unresolved */ |
| 2530 | rcu_read_unlock(); |
| 2531 | it->cache = &mrt->mfc_unres_queue; |
| 2532 | it->ct = 0; |
| 2533 | |
| 2534 | spin_lock_bh(&mfc_unres_lock); |
| 2535 | if (!list_empty(it->cache)) |
| 2536 | return list_first_entry(it->cache, struct mfc_cache, list); |
| 2537 | |
| 2538 | end_of_list: |
| 2539 | spin_unlock_bh(&mfc_unres_lock); |
| 2540 | it->cache = NULL; |
| 2541 | |
| 2542 | return NULL; |
| 2543 | } |
| 2544 | |
| 2545 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) |
| 2546 | { |
| 2547 | struct ipmr_mfc_iter *it = seq->private; |
| 2548 | struct mr_table *mrt = it->mrt; |
| 2549 | |
| 2550 | if (it->cache == &mrt->mfc_unres_queue) |
| 2551 | spin_unlock_bh(&mfc_unres_lock); |
| 2552 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
| 2553 | rcu_read_unlock(); |
| 2554 | } |
| 2555 | |
| 2556 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) |
| 2557 | { |
| 2558 | int n; |
| 2559 | |
| 2560 | if (v == SEQ_START_TOKEN) { |
| 2561 | seq_puts(seq, |
| 2562 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
| 2563 | } else { |
| 2564 | const struct mfc_cache *mfc = v; |
| 2565 | const struct ipmr_mfc_iter *it = seq->private; |
| 2566 | const struct mr_table *mrt = it->mrt; |
| 2567 | |
| 2568 | seq_printf(seq, "%08X %08X %-3hd", |
| 2569 | (__force u32) mfc->mfc_mcastgrp, |
| 2570 | (__force u32) mfc->mfc_origin, |
| 2571 | mfc->mfc_parent); |
| 2572 | |
| 2573 | if (it->cache != &mrt->mfc_unres_queue) { |
| 2574 | seq_printf(seq, " %8lu %8lu %8lu", |
| 2575 | mfc->mfc_un.res.pkt, |
| 2576 | mfc->mfc_un.res.bytes, |
| 2577 | mfc->mfc_un.res.wrong_if); |
| 2578 | for (n = mfc->mfc_un.res.minvif; |
| 2579 | n < mfc->mfc_un.res.maxvif; n++) { |
| 2580 | if (VIF_EXISTS(mrt, n) && |
| 2581 | mfc->mfc_un.res.ttls[n] < 255) |
| 2582 | seq_printf(seq, |
| 2583 | " %2d:%-3d", |
| 2584 | n, mfc->mfc_un.res.ttls[n]); |
| 2585 | } |
| 2586 | } else { |
| 2587 | /* unresolved mfc_caches don't contain |
| 2588 | * pkt, bytes and wrong_if values |
| 2589 | */ |
| 2590 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); |
| 2591 | } |
| 2592 | seq_putc(seq, '\n'); |
| 2593 | } |
| 2594 | return 0; |
| 2595 | } |
| 2596 | |
| 2597 | static const struct seq_operations ipmr_mfc_seq_ops = { |
| 2598 | .start = ipmr_mfc_seq_start, |
| 2599 | .next = ipmr_mfc_seq_next, |
| 2600 | .stop = ipmr_mfc_seq_stop, |
| 2601 | .show = ipmr_mfc_seq_show, |
| 2602 | }; |
| 2603 | |
| 2604 | static int ipmr_mfc_open(struct inode *inode, struct file *file) |
| 2605 | { |
| 2606 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
| 2607 | sizeof(struct ipmr_mfc_iter)); |
| 2608 | } |
| 2609 | |
| 2610 | static const struct file_operations ipmr_mfc_fops = { |
| 2611 | .owner = THIS_MODULE, |
| 2612 | .open = ipmr_mfc_open, |
| 2613 | .read = seq_read, |
| 2614 | .llseek = seq_lseek, |
| 2615 | .release = seq_release_net, |
| 2616 | }; |
| 2617 | #endif |
| 2618 | |
| 2619 | #ifdef CONFIG_IP_PIMSM_V2 |
| 2620 | static const struct net_protocol pim_protocol = { |
| 2621 | .handler = pim_rcv, |
| 2622 | .netns_ok = 1, |
| 2623 | }; |
| 2624 | #endif |
| 2625 | |
| 2626 | /* Setup for IP multicast routing */ |
| 2627 | static int __net_init ipmr_net_init(struct net *net) |
| 2628 | { |
| 2629 | int err; |
| 2630 | |
| 2631 | err = ipmr_rules_init(net); |
| 2632 | if (err < 0) |
| 2633 | goto fail; |
| 2634 | |
| 2635 | #ifdef CONFIG_PROC_FS |
| 2636 | err = -ENOMEM; |
| 2637 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
| 2638 | goto proc_vif_fail; |
| 2639 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
| 2640 | goto proc_cache_fail; |
| 2641 | #endif |
| 2642 | return 0; |
| 2643 | |
| 2644 | #ifdef CONFIG_PROC_FS |
| 2645 | proc_cache_fail: |
| 2646 | remove_proc_entry("ip_mr_vif", net->proc_net); |
| 2647 | proc_vif_fail: |
| 2648 | ipmr_rules_exit(net); |
| 2649 | #endif |
| 2650 | fail: |
| 2651 | return err; |
| 2652 | } |
| 2653 | |
| 2654 | static void __net_exit ipmr_net_exit(struct net *net) |
| 2655 | { |
| 2656 | #ifdef CONFIG_PROC_FS |
| 2657 | remove_proc_entry("ip_mr_cache", net->proc_net); |
| 2658 | remove_proc_entry("ip_mr_vif", net->proc_net); |
| 2659 | #endif |
| 2660 | ipmr_rules_exit(net); |
| 2661 | } |
| 2662 | |
| 2663 | static struct pernet_operations ipmr_net_ops = { |
| 2664 | .init = ipmr_net_init, |
| 2665 | .exit = ipmr_net_exit, |
| 2666 | }; |
| 2667 | |
| 2668 | int __init ip_mr_init(void) |
| 2669 | { |
| 2670 | int err; |
| 2671 | |
| 2672 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
| 2673 | sizeof(struct mfc_cache), |
| 2674 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
| 2675 | NULL); |
| 2676 | |
| 2677 | err = register_pernet_subsys(&ipmr_net_ops); |
| 2678 | if (err) |
| 2679 | goto reg_pernet_fail; |
| 2680 | |
| 2681 | err = register_netdevice_notifier(&ip_mr_notifier); |
| 2682 | if (err) |
| 2683 | goto reg_notif_fail; |
| 2684 | #ifdef CONFIG_IP_PIMSM_V2 |
| 2685 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { |
| 2686 | pr_err("%s: can't add PIM protocol\n", __func__); |
| 2687 | err = -EAGAIN; |
| 2688 | goto add_proto_fail; |
| 2689 | } |
| 2690 | #endif |
| 2691 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
| 2692 | NULL, ipmr_rtm_dumproute, NULL); |
| 2693 | return 0; |
| 2694 | |
| 2695 | #ifdef CONFIG_IP_PIMSM_V2 |
| 2696 | add_proto_fail: |
| 2697 | unregister_netdevice_notifier(&ip_mr_notifier); |
| 2698 | #endif |
| 2699 | reg_notif_fail: |
| 2700 | unregister_pernet_subsys(&ipmr_net_ops); |
| 2701 | reg_pernet_fail: |
| 2702 | kmem_cache_destroy(mrt_cachep); |
| 2703 | return err; |
| 2704 | } |