YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 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/system.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/timer.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/fcntl.h> |
| 28 | #include <linux/stat.h> |
| 29 | #include <linux/socket.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 30 | #include <linux/inet.h> |
| 31 | #include <linux/netdevice.h> |
| 32 | #include <linux/inetdevice.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 33 | #include <linux/proc_fs.h> |
| 34 | #include <linux/seq_file.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 35 | #include <linux/init.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 36 | #include <net/protocol.h> |
| 37 | #include <linux/skbuff.h> |
| 38 | #include <net/sock.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 39 | #include <net/raw.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 40 | #include <linux/notifier.h> |
| 41 | #include <linux/if_arp.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 42 | #include <net/checksum.h> |
| 43 | #include <net/netlink.h> |
| 44 | |
| 45 | #include <net/ipv6.h> |
| 46 | #include <net/ip6_route.h> |
| 47 | #include <linux/mroute6.h> |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 48 | #include <linux/pim.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 49 | #include <net/addrconf.h> |
| 50 | #include <linux/netfilter_ipv6.h> |
| 51 | |
| 52 | struct sock *mroute6_socket; |
| 53 | |
| 54 | |
| 55 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
| 56 | Note that the changes are semaphored via rtnl_lock. |
| 57 | */ |
| 58 | |
| 59 | static DEFINE_RWLOCK(mrt_lock); |
| 60 | |
| 61 | /* |
| 62 | * Multicast router control variables |
| 63 | */ |
| 64 | |
| 65 | static struct mif_device vif6_table[MAXMIFS]; /* Devices */ |
| 66 | static int maxvif; |
| 67 | |
| 68 | #define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL) |
| 69 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 70 | static int mroute_do_assert; /* Set in PIM assert */ |
| 71 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 72 | static int mroute_do_pim; |
| 73 | #else |
| 74 | #define mroute_do_pim 0 |
| 75 | #endif |
| 76 | |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 77 | static struct mfc6_cache *mfc6_cache_array[MFC6_LINES]; /* Forwarding cache */ |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 78 | |
| 79 | static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
| 80 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ |
| 81 | |
| 82 | /* Special spinlock for queue of unresolved entries */ |
| 83 | static DEFINE_SPINLOCK(mfc_unres_lock); |
| 84 | |
| 85 | /* We return to original Alan's scheme. Hash table of resolved |
| 86 | entries is changed only in process context and protected |
| 87 | with weak lock mrt_lock. Queue of unresolved entries is protected |
| 88 | with strong spinlock mfc_unres_lock. |
| 89 | |
| 90 | In this case data path is free of exclusive locks at all. |
| 91 | */ |
| 92 | |
| 93 | static struct kmem_cache *mrt_cachep __read_mostly; |
| 94 | |
| 95 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache); |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 96 | static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 97 | static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm); |
| 98 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 99 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 100 | static struct inet6_protocol pim6_protocol; |
| 101 | #endif |
| 102 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 103 | static struct timer_list ipmr_expire_timer; |
| 104 | |
| 105 | |
| 106 | #ifdef CONFIG_PROC_FS |
| 107 | |
| 108 | struct ipmr_mfc_iter { |
| 109 | struct mfc6_cache **cache; |
| 110 | int ct; |
| 111 | }; |
| 112 | |
| 113 | |
| 114 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) |
| 115 | { |
| 116 | struct mfc6_cache *mfc; |
| 117 | |
| 118 | it->cache = mfc6_cache_array; |
| 119 | read_lock(&mrt_lock); |
| 120 | for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++) |
| 121 | for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next) |
| 122 | if (pos-- == 0) |
| 123 | return mfc; |
| 124 | read_unlock(&mrt_lock); |
| 125 | |
| 126 | it->cache = &mfc_unres_queue; |
| 127 | spin_lock_bh(&mfc_unres_lock); |
| 128 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
| 129 | if (pos-- == 0) |
| 130 | return mfc; |
| 131 | spin_unlock_bh(&mfc_unres_lock); |
| 132 | |
| 133 | it->cache = NULL; |
| 134 | return NULL; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | |
| 139 | |
| 140 | /* |
| 141 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif |
| 142 | */ |
| 143 | |
| 144 | struct ipmr_vif_iter { |
| 145 | int ct; |
| 146 | }; |
| 147 | |
| 148 | static struct mif_device *ip6mr_vif_seq_idx(struct ipmr_vif_iter *iter, |
| 149 | loff_t pos) |
| 150 | { |
| 151 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { |
| 152 | if (!MIF_EXISTS(iter->ct)) |
| 153 | continue; |
| 154 | if (pos-- == 0) |
| 155 | return &vif6_table[iter->ct]; |
| 156 | } |
| 157 | return NULL; |
| 158 | } |
| 159 | |
| 160 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
| 161 | __acquires(mrt_lock) |
| 162 | { |
| 163 | read_lock(&mrt_lock); |
| 164 | return (*pos ? ip6mr_vif_seq_idx(seq->private, *pos - 1) |
| 165 | : SEQ_START_TOKEN); |
| 166 | } |
| 167 | |
| 168 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 169 | { |
| 170 | struct ipmr_vif_iter *iter = seq->private; |
| 171 | |
| 172 | ++*pos; |
| 173 | if (v == SEQ_START_TOKEN) |
| 174 | return ip6mr_vif_seq_idx(iter, 0); |
| 175 | |
| 176 | while (++iter->ct < maxvif) { |
| 177 | if (!MIF_EXISTS(iter->ct)) |
| 178 | continue; |
| 179 | return &vif6_table[iter->ct]; |
| 180 | } |
| 181 | return NULL; |
| 182 | } |
| 183 | |
| 184 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) |
| 185 | __releases(mrt_lock) |
| 186 | { |
| 187 | read_unlock(&mrt_lock); |
| 188 | } |
| 189 | |
| 190 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) |
| 191 | { |
| 192 | if (v == SEQ_START_TOKEN) { |
| 193 | seq_puts(seq, |
| 194 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); |
| 195 | } else { |
| 196 | const struct mif_device *vif = v; |
| 197 | const char *name = vif->dev ? vif->dev->name : "none"; |
| 198 | |
| 199 | seq_printf(seq, |
Al Viro | d430a22 | 2008-06-02 10:59:02 +0100 | [diff] [blame] | 200 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 201 | vif - vif6_table, |
| 202 | name, vif->bytes_in, vif->pkt_in, |
| 203 | vif->bytes_out, vif->pkt_out, |
| 204 | vif->flags); |
| 205 | } |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static struct seq_operations ip6mr_vif_seq_ops = { |
| 210 | .start = ip6mr_vif_seq_start, |
| 211 | .next = ip6mr_vif_seq_next, |
| 212 | .stop = ip6mr_vif_seq_stop, |
| 213 | .show = ip6mr_vif_seq_show, |
| 214 | }; |
| 215 | |
| 216 | static int ip6mr_vif_open(struct inode *inode, struct file *file) |
| 217 | { |
| 218 | return seq_open_private(file, &ip6mr_vif_seq_ops, |
| 219 | sizeof(struct ipmr_vif_iter)); |
| 220 | } |
| 221 | |
| 222 | static struct file_operations ip6mr_vif_fops = { |
| 223 | .owner = THIS_MODULE, |
| 224 | .open = ip6mr_vif_open, |
| 225 | .read = seq_read, |
| 226 | .llseek = seq_lseek, |
| 227 | .release = seq_release, |
| 228 | }; |
| 229 | |
| 230 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
| 231 | { |
| 232 | return (*pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
| 233 | : SEQ_START_TOKEN); |
| 234 | } |
| 235 | |
| 236 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 237 | { |
| 238 | struct mfc6_cache *mfc = v; |
| 239 | struct ipmr_mfc_iter *it = seq->private; |
| 240 | |
| 241 | ++*pos; |
| 242 | |
| 243 | if (v == SEQ_START_TOKEN) |
| 244 | return ipmr_mfc_seq_idx(seq->private, 0); |
| 245 | |
| 246 | if (mfc->next) |
| 247 | return mfc->next; |
| 248 | |
| 249 | if (it->cache == &mfc_unres_queue) |
| 250 | goto end_of_list; |
| 251 | |
| 252 | BUG_ON(it->cache != mfc6_cache_array); |
| 253 | |
| 254 | while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) { |
| 255 | mfc = mfc6_cache_array[it->ct]; |
| 256 | if (mfc) |
| 257 | return mfc; |
| 258 | } |
| 259 | |
| 260 | /* exhausted cache_array, show unresolved */ |
| 261 | read_unlock(&mrt_lock); |
| 262 | it->cache = &mfc_unres_queue; |
| 263 | it->ct = 0; |
| 264 | |
| 265 | spin_lock_bh(&mfc_unres_lock); |
| 266 | mfc = mfc_unres_queue; |
| 267 | if (mfc) |
| 268 | return mfc; |
| 269 | |
| 270 | end_of_list: |
| 271 | spin_unlock_bh(&mfc_unres_lock); |
| 272 | it->cache = NULL; |
| 273 | |
| 274 | return NULL; |
| 275 | } |
| 276 | |
| 277 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) |
| 278 | { |
| 279 | struct ipmr_mfc_iter *it = seq->private; |
| 280 | |
| 281 | if (it->cache == &mfc_unres_queue) |
| 282 | spin_unlock_bh(&mfc_unres_lock); |
| 283 | else if (it->cache == mfc6_cache_array) |
| 284 | read_unlock(&mrt_lock); |
| 285 | } |
| 286 | |
| 287 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) |
| 288 | { |
| 289 | int n; |
| 290 | |
| 291 | if (v == SEQ_START_TOKEN) { |
| 292 | seq_puts(seq, |
| 293 | "Group " |
| 294 | "Origin " |
| 295 | "Iif Pkts Bytes Wrong Oifs\n"); |
| 296 | } else { |
| 297 | const struct mfc6_cache *mfc = v; |
| 298 | const struct ipmr_mfc_iter *it = seq->private; |
| 299 | |
| 300 | seq_printf(seq, |
| 301 | NIP6_FMT " " NIP6_FMT " %-3d %8ld %8ld %8ld", |
| 302 | NIP6(mfc->mf6c_mcastgrp), NIP6(mfc->mf6c_origin), |
| 303 | mfc->mf6c_parent, |
| 304 | mfc->mfc_un.res.pkt, |
| 305 | mfc->mfc_un.res.bytes, |
| 306 | mfc->mfc_un.res.wrong_if); |
| 307 | |
| 308 | if (it->cache != &mfc_unres_queue) { |
| 309 | for (n = mfc->mfc_un.res.minvif; |
| 310 | n < mfc->mfc_un.res.maxvif; n++) { |
| 311 | if (MIF_EXISTS(n) && |
| 312 | mfc->mfc_un.res.ttls[n] < 255) |
| 313 | seq_printf(seq, |
| 314 | " %2d:%-3d", |
| 315 | n, mfc->mfc_un.res.ttls[n]); |
| 316 | } |
| 317 | } |
| 318 | seq_putc(seq, '\n'); |
| 319 | } |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static struct seq_operations ipmr_mfc_seq_ops = { |
| 324 | .start = ipmr_mfc_seq_start, |
| 325 | .next = ipmr_mfc_seq_next, |
| 326 | .stop = ipmr_mfc_seq_stop, |
| 327 | .show = ipmr_mfc_seq_show, |
| 328 | }; |
| 329 | |
| 330 | static int ipmr_mfc_open(struct inode *inode, struct file *file) |
| 331 | { |
| 332 | return seq_open_private(file, &ipmr_mfc_seq_ops, |
| 333 | sizeof(struct ipmr_mfc_iter)); |
| 334 | } |
| 335 | |
| 336 | static struct file_operations ip6mr_mfc_fops = { |
| 337 | .owner = THIS_MODULE, |
| 338 | .open = ipmr_mfc_open, |
| 339 | .read = seq_read, |
| 340 | .llseek = seq_lseek, |
| 341 | .release = seq_release, |
| 342 | }; |
| 343 | #endif |
| 344 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 345 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 346 | static int reg_vif_num = -1; |
| 347 | |
| 348 | static int pim6_rcv(struct sk_buff *skb) |
| 349 | { |
| 350 | struct pimreghdr *pim; |
| 351 | struct ipv6hdr *encap; |
| 352 | struct net_device *reg_dev = NULL; |
| 353 | |
| 354 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
| 355 | goto drop; |
| 356 | |
| 357 | pim = (struct pimreghdr *)skb_transport_header(skb); |
| 358 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || |
| 359 | (pim->flags & PIM_NULL_REGISTER) || |
| 360 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
Al Viro | ec6b486 | 2008-04-26 22:28:58 -0700 | [diff] [blame] | 361 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 362 | goto drop; |
| 363 | |
| 364 | /* check if the inner packet is destined to mcast group */ |
| 365 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + |
| 366 | sizeof(*pim)); |
| 367 | |
| 368 | if (!ipv6_addr_is_multicast(&encap->daddr) || |
| 369 | encap->payload_len == 0 || |
| 370 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) |
| 371 | goto drop; |
| 372 | |
| 373 | read_lock(&mrt_lock); |
| 374 | if (reg_vif_num >= 0) |
| 375 | reg_dev = vif6_table[reg_vif_num].dev; |
| 376 | if (reg_dev) |
| 377 | dev_hold(reg_dev); |
| 378 | read_unlock(&mrt_lock); |
| 379 | |
| 380 | if (reg_dev == NULL) |
| 381 | goto drop; |
| 382 | |
| 383 | skb->mac_header = skb->network_header; |
| 384 | skb_pull(skb, (u8 *)encap - skb->data); |
| 385 | skb_reset_network_header(skb); |
| 386 | skb->dev = reg_dev; |
| 387 | skb->protocol = htons(ETH_P_IP); |
| 388 | skb->ip_summed = 0; |
| 389 | skb->pkt_type = PACKET_HOST; |
| 390 | dst_release(skb->dst); |
Pavel Emelyanov | dc58c78 | 2008-05-21 14:17:54 -0700 | [diff] [blame] | 391 | reg_dev->stats.rx_bytes += skb->len; |
| 392 | reg_dev->stats.rx_packets++; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 393 | skb->dst = NULL; |
| 394 | nf_reset(skb); |
| 395 | netif_rx(skb); |
| 396 | dev_put(reg_dev); |
| 397 | return 0; |
| 398 | drop: |
| 399 | kfree_skb(skb); |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | static struct inet6_protocol pim6_protocol = { |
| 404 | .handler = pim6_rcv, |
| 405 | }; |
| 406 | |
| 407 | /* Service routines creating virtual interfaces: PIMREG */ |
| 408 | |
| 409 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
| 410 | { |
| 411 | read_lock(&mrt_lock); |
Pavel Emelyanov | dc58c78 | 2008-05-21 14:17:54 -0700 | [diff] [blame] | 412 | dev->stats.tx_bytes += skb->len; |
| 413 | dev->stats.tx_packets++; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 414 | ip6mr_cache_report(skb, reg_vif_num, MRT6MSG_WHOLEPKT); |
| 415 | read_unlock(&mrt_lock); |
| 416 | kfree_skb(skb); |
| 417 | return 0; |
| 418 | } |
| 419 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 420 | static void reg_vif_setup(struct net_device *dev) |
| 421 | { |
| 422 | dev->type = ARPHRD_PIMREG; |
| 423 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; |
| 424 | dev->flags = IFF_NOARP; |
| 425 | dev->hard_start_xmit = reg_vif_xmit; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 426 | dev->destructor = free_netdev; |
| 427 | } |
| 428 | |
| 429 | static struct net_device *ip6mr_reg_vif(void) |
| 430 | { |
| 431 | struct net_device *dev; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 432 | |
Pavel Emelyanov | dc58c78 | 2008-05-21 14:17:54 -0700 | [diff] [blame] | 433 | dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 434 | if (dev == NULL) |
| 435 | return NULL; |
| 436 | |
| 437 | if (register_netdevice(dev)) { |
| 438 | free_netdev(dev); |
| 439 | return NULL; |
| 440 | } |
| 441 | dev->iflink = 0; |
| 442 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 443 | if (dev_open(dev)) |
| 444 | goto failure; |
| 445 | |
| 446 | return dev; |
| 447 | |
| 448 | failure: |
| 449 | /* allow the register to be completed before unregistering. */ |
| 450 | rtnl_unlock(); |
| 451 | rtnl_lock(); |
| 452 | |
| 453 | unregister_netdevice(dev); |
| 454 | return NULL; |
| 455 | } |
| 456 | #endif |
| 457 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 458 | /* |
| 459 | * Delete a VIF entry |
| 460 | */ |
| 461 | |
| 462 | static int mif6_delete(int vifi) |
| 463 | { |
| 464 | struct mif_device *v; |
| 465 | struct net_device *dev; |
| 466 | if (vifi < 0 || vifi >= maxvif) |
| 467 | return -EADDRNOTAVAIL; |
| 468 | |
| 469 | v = &vif6_table[vifi]; |
| 470 | |
| 471 | write_lock_bh(&mrt_lock); |
| 472 | dev = v->dev; |
| 473 | v->dev = NULL; |
| 474 | |
| 475 | if (!dev) { |
| 476 | write_unlock_bh(&mrt_lock); |
| 477 | return -EADDRNOTAVAIL; |
| 478 | } |
| 479 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 480 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 481 | if (vifi == reg_vif_num) |
| 482 | reg_vif_num = -1; |
| 483 | #endif |
| 484 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 485 | if (vifi + 1 == maxvif) { |
| 486 | int tmp; |
| 487 | for (tmp = vifi - 1; tmp >= 0; tmp--) { |
| 488 | if (MIF_EXISTS(tmp)) |
| 489 | break; |
| 490 | } |
| 491 | maxvif = tmp + 1; |
| 492 | } |
| 493 | |
| 494 | write_unlock_bh(&mrt_lock); |
| 495 | |
| 496 | dev_set_allmulti(dev, -1); |
| 497 | |
| 498 | if (v->flags & MIFF_REGISTER) |
| 499 | unregister_netdevice(dev); |
| 500 | |
| 501 | dev_put(dev); |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | /* Destroy an unresolved cache entry, killing queued skbs |
| 506 | and reporting error to netlink readers. |
| 507 | */ |
| 508 | |
| 509 | static void ip6mr_destroy_unres(struct mfc6_cache *c) |
| 510 | { |
| 511 | struct sk_buff *skb; |
| 512 | |
| 513 | atomic_dec(&cache_resolve_queue_len); |
| 514 | |
| 515 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { |
| 516 | if (ipv6_hdr(skb)->version == 0) { |
| 517 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
| 518 | nlh->nlmsg_type = NLMSG_ERROR; |
| 519 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| 520 | skb_trim(skb, nlh->nlmsg_len); |
| 521 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; |
| 522 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
| 523 | } else |
| 524 | kfree_skb(skb); |
| 525 | } |
| 526 | |
| 527 | kmem_cache_free(mrt_cachep, c); |
| 528 | } |
| 529 | |
| 530 | |
| 531 | /* Single timer process for all the unresolved queue. */ |
| 532 | |
| 533 | static void ipmr_do_expire_process(unsigned long dummy) |
| 534 | { |
| 535 | unsigned long now = jiffies; |
| 536 | unsigned long expires = 10 * HZ; |
| 537 | struct mfc6_cache *c, **cp; |
| 538 | |
| 539 | cp = &mfc_unres_queue; |
| 540 | |
| 541 | while ((c = *cp) != NULL) { |
| 542 | if (time_after(c->mfc_un.unres.expires, now)) { |
| 543 | /* not yet... */ |
| 544 | unsigned long interval = c->mfc_un.unres.expires - now; |
| 545 | if (interval < expires) |
| 546 | expires = interval; |
| 547 | cp = &c->next; |
| 548 | continue; |
| 549 | } |
| 550 | |
| 551 | *cp = c->next; |
| 552 | ip6mr_destroy_unres(c); |
| 553 | } |
| 554 | |
| 555 | if (atomic_read(&cache_resolve_queue_len)) |
| 556 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
| 557 | } |
| 558 | |
| 559 | static void ipmr_expire_process(unsigned long dummy) |
| 560 | { |
| 561 | if (!spin_trylock(&mfc_unres_lock)) { |
| 562 | mod_timer(&ipmr_expire_timer, jiffies + 1); |
| 563 | return; |
| 564 | } |
| 565 | |
| 566 | if (atomic_read(&cache_resolve_queue_len)) |
| 567 | ipmr_do_expire_process(dummy); |
| 568 | |
| 569 | spin_unlock(&mfc_unres_lock); |
| 570 | } |
| 571 | |
| 572 | /* Fill oifs list. It is called under write locked mrt_lock. */ |
| 573 | |
| 574 | static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls) |
| 575 | { |
| 576 | int vifi; |
| 577 | |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 578 | cache->mfc_un.res.minvif = MAXMIFS; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 579 | cache->mfc_un.res.maxvif = 0; |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 580 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 581 | |
| 582 | for (vifi = 0; vifi < maxvif; vifi++) { |
| 583 | if (MIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { |
| 584 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
| 585 | if (cache->mfc_un.res.minvif > vifi) |
| 586 | cache->mfc_un.res.minvif = vifi; |
| 587 | if (cache->mfc_un.res.maxvif <= vifi) |
| 588 | cache->mfc_un.res.maxvif = vifi + 1; |
| 589 | } |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | static int mif6_add(struct mif6ctl *vifc, int mrtsock) |
| 594 | { |
| 595 | int vifi = vifc->mif6c_mifi; |
| 596 | struct mif_device *v = &vif6_table[vifi]; |
| 597 | struct net_device *dev; |
| 598 | |
| 599 | /* Is vif busy ? */ |
| 600 | if (MIF_EXISTS(vifi)) |
| 601 | return -EADDRINUSE; |
| 602 | |
| 603 | switch (vifc->mif6c_flags) { |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 604 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 605 | case MIFF_REGISTER: |
| 606 | /* |
| 607 | * Special Purpose VIF in PIM |
| 608 | * All the packets will be sent to the daemon |
| 609 | */ |
| 610 | if (reg_vif_num >= 0) |
| 611 | return -EADDRINUSE; |
| 612 | dev = ip6mr_reg_vif(); |
| 613 | if (!dev) |
| 614 | return -ENOBUFS; |
| 615 | break; |
| 616 | #endif |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 617 | case 0: |
| 618 | dev = dev_get_by_index(&init_net, vifc->mif6c_pifi); |
| 619 | if (!dev) |
| 620 | return -EADDRNOTAVAIL; |
| 621 | dev_put(dev); |
| 622 | break; |
| 623 | default: |
| 624 | return -EINVAL; |
| 625 | } |
| 626 | |
| 627 | dev_set_allmulti(dev, 1); |
| 628 | |
| 629 | /* |
| 630 | * Fill in the VIF structures |
| 631 | */ |
| 632 | v->rate_limit = vifc->vifc_rate_limit; |
| 633 | v->flags = vifc->mif6c_flags; |
| 634 | if (!mrtsock) |
| 635 | v->flags |= VIFF_STATIC; |
| 636 | v->threshold = vifc->vifc_threshold; |
| 637 | v->bytes_in = 0; |
| 638 | v->bytes_out = 0; |
| 639 | v->pkt_in = 0; |
| 640 | v->pkt_out = 0; |
| 641 | v->link = dev->ifindex; |
| 642 | if (v->flags & MIFF_REGISTER) |
| 643 | v->link = dev->iflink; |
| 644 | |
| 645 | /* And finish update writing critical data */ |
| 646 | write_lock_bh(&mrt_lock); |
| 647 | dev_hold(dev); |
| 648 | v->dev = dev; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 649 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 650 | if (v->flags & MIFF_REGISTER) |
| 651 | reg_vif_num = vifi; |
| 652 | #endif |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 653 | if (vifi + 1 > maxvif) |
| 654 | maxvif = vifi + 1; |
| 655 | write_unlock_bh(&mrt_lock); |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_addr *mcastgrp) |
| 660 | { |
| 661 | int line = MFC6_HASH(mcastgrp, origin); |
| 662 | struct mfc6_cache *c; |
| 663 | |
| 664 | for (c = mfc6_cache_array[line]; c; c = c->next) { |
| 665 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
| 666 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) |
| 667 | break; |
| 668 | } |
| 669 | return c; |
| 670 | } |
| 671 | |
| 672 | /* |
| 673 | * Allocate a multicast cache entry |
| 674 | */ |
| 675 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
| 676 | { |
| 677 | struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_KERNEL); |
| 678 | if (c == NULL) |
| 679 | return NULL; |
| 680 | memset(c, 0, sizeof(*c)); |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 681 | c->mfc_un.res.minvif = MAXMIFS; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 682 | return c; |
| 683 | } |
| 684 | |
| 685 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
| 686 | { |
| 687 | struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); |
| 688 | if (c == NULL) |
| 689 | return NULL; |
| 690 | memset(c, 0, sizeof(*c)); |
| 691 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
| 692 | c->mfc_un.unres.expires = jiffies + 10 * HZ; |
| 693 | return c; |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * A cache entry has gone into a resolved state from queued |
| 698 | */ |
| 699 | |
| 700 | static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c) |
| 701 | { |
| 702 | struct sk_buff *skb; |
| 703 | |
| 704 | /* |
| 705 | * Play the pending entries through our router |
| 706 | */ |
| 707 | |
| 708 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
| 709 | if (ipv6_hdr(skb)->version == 0) { |
| 710 | int err; |
| 711 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
| 712 | |
| 713 | if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { |
YOSHIFUJI Hideaki | 549e028 | 2008-04-05 22:17:39 +0900 | [diff] [blame] | 714 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 715 | } else { |
| 716 | nlh->nlmsg_type = NLMSG_ERROR; |
| 717 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| 718 | skb_trim(skb, nlh->nlmsg_len); |
| 719 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; |
| 720 | } |
| 721 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
| 722 | } else |
| 723 | ip6_mr_forward(skb, c); |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd |
| 729 | * expects the following bizarre scheme. |
| 730 | * |
| 731 | * Called under mrt_lock. |
| 732 | */ |
| 733 | |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 734 | static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert) |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 735 | { |
| 736 | struct sk_buff *skb; |
| 737 | struct mrt6msg *msg; |
| 738 | int ret; |
| 739 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 740 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 741 | if (assert == MRT6MSG_WHOLEPKT) |
| 742 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) |
| 743 | +sizeof(*msg)); |
| 744 | else |
| 745 | #endif |
| 746 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 747 | |
| 748 | if (!skb) |
| 749 | return -ENOBUFS; |
| 750 | |
| 751 | /* I suppose that internal messages |
| 752 | * do not require checksums */ |
| 753 | |
| 754 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 755 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 756 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 757 | if (assert == MRT6MSG_WHOLEPKT) { |
| 758 | /* Ugly, but we have no choice with this interface. |
| 759 | Duplicate old header, fix length etc. |
| 760 | And all this only to mangle msg->im6_msgtype and |
| 761 | to set msg->im6_mbz to "mbz" :-) |
| 762 | */ |
| 763 | skb_push(skb, -skb_network_offset(pkt)); |
| 764 | |
| 765 | skb_push(skb, sizeof(*msg)); |
| 766 | skb_reset_transport_header(skb); |
| 767 | msg = (struct mrt6msg *)skb_transport_header(skb); |
| 768 | msg->im6_mbz = 0; |
| 769 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; |
| 770 | msg->im6_mif = reg_vif_num; |
| 771 | msg->im6_pad = 0; |
| 772 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); |
| 773 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); |
| 774 | |
| 775 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 776 | } else |
| 777 | #endif |
| 778 | { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 779 | /* |
| 780 | * Copy the IP header |
| 781 | */ |
| 782 | |
| 783 | skb_put(skb, sizeof(struct ipv6hdr)); |
| 784 | skb_reset_network_header(skb); |
| 785 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); |
| 786 | |
| 787 | /* |
| 788 | * Add our header |
| 789 | */ |
| 790 | skb_put(skb, sizeof(*msg)); |
| 791 | skb_reset_transport_header(skb); |
| 792 | msg = (struct mrt6msg *)skb_transport_header(skb); |
| 793 | |
| 794 | msg->im6_mbz = 0; |
| 795 | msg->im6_msgtype = assert; |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 796 | msg->im6_mif = mifi; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 797 | msg->im6_pad = 0; |
| 798 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); |
| 799 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); |
| 800 | |
| 801 | skb->dst = dst_clone(pkt->dst); |
| 802 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 803 | |
| 804 | skb_pull(skb, sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 805 | } |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 806 | |
| 807 | if (mroute6_socket == NULL) { |
| 808 | kfree_skb(skb); |
| 809 | return -EINVAL; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * Deliver to user space multicast routing algorithms |
| 814 | */ |
| 815 | if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) { |
| 816 | if (net_ratelimit()) |
| 817 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); |
| 818 | kfree_skb(skb); |
| 819 | } |
| 820 | |
| 821 | return ret; |
| 822 | } |
| 823 | |
| 824 | /* |
| 825 | * Queue a packet for resolution. It gets locked cache entry! |
| 826 | */ |
| 827 | |
| 828 | static int |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 829 | ip6mr_cache_unresolved(mifi_t mifi, struct sk_buff *skb) |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 830 | { |
| 831 | int err; |
| 832 | struct mfc6_cache *c; |
| 833 | |
| 834 | spin_lock_bh(&mfc_unres_lock); |
| 835 | for (c = mfc_unres_queue; c; c = c->next) { |
| 836 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
| 837 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) |
| 838 | break; |
| 839 | } |
| 840 | |
| 841 | if (c == NULL) { |
| 842 | /* |
| 843 | * Create a new entry if allowable |
| 844 | */ |
| 845 | |
| 846 | if (atomic_read(&cache_resolve_queue_len) >= 10 || |
| 847 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
| 848 | spin_unlock_bh(&mfc_unres_lock); |
| 849 | |
| 850 | kfree_skb(skb); |
| 851 | return -ENOBUFS; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * Fill in the new cache entry |
| 856 | */ |
| 857 | c->mf6c_parent = -1; |
| 858 | c->mf6c_origin = ipv6_hdr(skb)->saddr; |
| 859 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; |
| 860 | |
| 861 | /* |
| 862 | * Reflect first query at pim6sd |
| 863 | */ |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 864 | if ((err = ip6mr_cache_report(skb, mifi, MRT6MSG_NOCACHE)) < 0) { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 865 | /* If the report failed throw the cache entry |
| 866 | out - Brad Parker |
| 867 | */ |
| 868 | spin_unlock_bh(&mfc_unres_lock); |
| 869 | |
| 870 | kmem_cache_free(mrt_cachep, c); |
| 871 | kfree_skb(skb); |
| 872 | return err; |
| 873 | } |
| 874 | |
| 875 | atomic_inc(&cache_resolve_queue_len); |
| 876 | c->next = mfc_unres_queue; |
| 877 | mfc_unres_queue = c; |
| 878 | |
| 879 | ipmr_do_expire_process(1); |
| 880 | } |
| 881 | |
| 882 | /* |
| 883 | * See if we can append the packet |
| 884 | */ |
| 885 | if (c->mfc_un.unres.unresolved.qlen > 3) { |
| 886 | kfree_skb(skb); |
| 887 | err = -ENOBUFS; |
| 888 | } else { |
| 889 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
| 890 | err = 0; |
| 891 | } |
| 892 | |
| 893 | spin_unlock_bh(&mfc_unres_lock); |
| 894 | return err; |
| 895 | } |
| 896 | |
| 897 | /* |
| 898 | * MFC6 cache manipulation by user space |
| 899 | */ |
| 900 | |
| 901 | static int ip6mr_mfc_delete(struct mf6cctl *mfc) |
| 902 | { |
| 903 | int line; |
| 904 | struct mfc6_cache *c, **cp; |
| 905 | |
| 906 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); |
| 907 | |
| 908 | for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) { |
| 909 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
| 910 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { |
| 911 | write_lock_bh(&mrt_lock); |
| 912 | *cp = c->next; |
| 913 | write_unlock_bh(&mrt_lock); |
| 914 | |
| 915 | kmem_cache_free(mrt_cachep, c); |
| 916 | return 0; |
| 917 | } |
| 918 | } |
| 919 | return -ENOENT; |
| 920 | } |
| 921 | |
| 922 | static int ip6mr_device_event(struct notifier_block *this, |
| 923 | unsigned long event, void *ptr) |
| 924 | { |
| 925 | struct net_device *dev = ptr; |
| 926 | struct mif_device *v; |
| 927 | int ct; |
| 928 | |
| 929 | if (dev_net(dev) != &init_net) |
| 930 | return NOTIFY_DONE; |
| 931 | |
| 932 | if (event != NETDEV_UNREGISTER) |
| 933 | return NOTIFY_DONE; |
| 934 | |
| 935 | v = &vif6_table[0]; |
| 936 | for (ct = 0; ct < maxvif; ct++, v++) { |
| 937 | if (v->dev == dev) |
| 938 | mif6_delete(ct); |
| 939 | } |
| 940 | return NOTIFY_DONE; |
| 941 | } |
| 942 | |
| 943 | static struct notifier_block ip6_mr_notifier = { |
| 944 | .notifier_call = ip6mr_device_event |
| 945 | }; |
| 946 | |
| 947 | /* |
| 948 | * Setup for IP multicast routing |
| 949 | */ |
| 950 | |
| 951 | void __init ip6_mr_init(void) |
| 952 | { |
| 953 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
| 954 | sizeof(struct mfc6_cache), |
| 955 | 0, SLAB_HWCACHE_ALIGN, |
| 956 | NULL); |
| 957 | if (!mrt_cachep) |
| 958 | panic("cannot allocate ip6_mrt_cache"); |
| 959 | |
| 960 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
| 961 | register_netdevice_notifier(&ip6_mr_notifier); |
| 962 | #ifdef CONFIG_PROC_FS |
| 963 | proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops); |
| 964 | proc_net_fops_create(&init_net, "ip6_mr_cache", 0, &ip6mr_mfc_fops); |
| 965 | #endif |
| 966 | } |
| 967 | |
| 968 | |
| 969 | static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock) |
| 970 | { |
| 971 | int line; |
| 972 | struct mfc6_cache *uc, *c, **cp; |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 973 | unsigned char ttls[MAXMIFS]; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 974 | int i; |
| 975 | |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 976 | memset(ttls, 255, MAXMIFS); |
| 977 | for (i = 0; i < MAXMIFS; i++) { |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 978 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
| 979 | ttls[i] = 1; |
| 980 | |
| 981 | } |
| 982 | |
| 983 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); |
| 984 | |
| 985 | for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) { |
| 986 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
| 987 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) |
| 988 | break; |
| 989 | } |
| 990 | |
| 991 | if (c != NULL) { |
| 992 | write_lock_bh(&mrt_lock); |
| 993 | c->mf6c_parent = mfc->mf6cc_parent; |
| 994 | ip6mr_update_thresholds(c, ttls); |
| 995 | if (!mrtsock) |
| 996 | c->mfc_flags |= MFC_STATIC; |
| 997 | write_unlock_bh(&mrt_lock); |
| 998 | return 0; |
| 999 | } |
| 1000 | |
| 1001 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) |
| 1002 | return -EINVAL; |
| 1003 | |
| 1004 | c = ip6mr_cache_alloc(); |
| 1005 | if (c == NULL) |
| 1006 | return -ENOMEM; |
| 1007 | |
| 1008 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; |
| 1009 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; |
| 1010 | c->mf6c_parent = mfc->mf6cc_parent; |
| 1011 | ip6mr_update_thresholds(c, ttls); |
| 1012 | if (!mrtsock) |
| 1013 | c->mfc_flags |= MFC_STATIC; |
| 1014 | |
| 1015 | write_lock_bh(&mrt_lock); |
| 1016 | c->next = mfc6_cache_array[line]; |
| 1017 | mfc6_cache_array[line] = c; |
| 1018 | write_unlock_bh(&mrt_lock); |
| 1019 | |
| 1020 | /* |
| 1021 | * Check to see if we resolved a queued list. If so we |
| 1022 | * need to send on the frames and tidy up. |
| 1023 | */ |
| 1024 | spin_lock_bh(&mfc_unres_lock); |
| 1025 | for (cp = &mfc_unres_queue; (uc = *cp) != NULL; |
| 1026 | cp = &uc->next) { |
| 1027 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
| 1028 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
| 1029 | *cp = uc->next; |
| 1030 | if (atomic_dec_and_test(&cache_resolve_queue_len)) |
| 1031 | del_timer(&ipmr_expire_timer); |
| 1032 | break; |
| 1033 | } |
| 1034 | } |
| 1035 | spin_unlock_bh(&mfc_unres_lock); |
| 1036 | |
| 1037 | if (uc) { |
| 1038 | ip6mr_cache_resolve(uc, c); |
| 1039 | kmem_cache_free(mrt_cachep, uc); |
| 1040 | } |
| 1041 | return 0; |
| 1042 | } |
| 1043 | |
| 1044 | /* |
| 1045 | * Close the multicast socket, and clear the vif tables etc |
| 1046 | */ |
| 1047 | |
| 1048 | static void mroute_clean_tables(struct sock *sk) |
| 1049 | { |
| 1050 | int i; |
| 1051 | |
| 1052 | /* |
| 1053 | * Shut down all active vif entries |
| 1054 | */ |
| 1055 | for (i = 0; i < maxvif; i++) { |
| 1056 | if (!(vif6_table[i].flags & VIFF_STATIC)) |
| 1057 | mif6_delete(i); |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * Wipe the cache |
| 1062 | */ |
| 1063 | for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) { |
| 1064 | struct mfc6_cache *c, **cp; |
| 1065 | |
| 1066 | cp = &mfc6_cache_array[i]; |
| 1067 | while ((c = *cp) != NULL) { |
| 1068 | if (c->mfc_flags & MFC_STATIC) { |
| 1069 | cp = &c->next; |
| 1070 | continue; |
| 1071 | } |
| 1072 | write_lock_bh(&mrt_lock); |
| 1073 | *cp = c->next; |
| 1074 | write_unlock_bh(&mrt_lock); |
| 1075 | |
| 1076 | kmem_cache_free(mrt_cachep, c); |
| 1077 | } |
| 1078 | } |
| 1079 | |
| 1080 | if (atomic_read(&cache_resolve_queue_len) != 0) { |
| 1081 | struct mfc6_cache *c; |
| 1082 | |
| 1083 | spin_lock_bh(&mfc_unres_lock); |
| 1084 | while (mfc_unres_queue != NULL) { |
| 1085 | c = mfc_unres_queue; |
| 1086 | mfc_unres_queue = c->next; |
| 1087 | spin_unlock_bh(&mfc_unres_lock); |
| 1088 | |
| 1089 | ip6mr_destroy_unres(c); |
| 1090 | |
| 1091 | spin_lock_bh(&mfc_unres_lock); |
| 1092 | } |
| 1093 | spin_unlock_bh(&mfc_unres_lock); |
| 1094 | } |
| 1095 | } |
| 1096 | |
| 1097 | static int ip6mr_sk_init(struct sock *sk) |
| 1098 | { |
| 1099 | int err = 0; |
| 1100 | |
| 1101 | rtnl_lock(); |
| 1102 | write_lock_bh(&mrt_lock); |
| 1103 | if (likely(mroute6_socket == NULL)) |
| 1104 | mroute6_socket = sk; |
| 1105 | else |
| 1106 | err = -EADDRINUSE; |
| 1107 | write_unlock_bh(&mrt_lock); |
| 1108 | |
| 1109 | rtnl_unlock(); |
| 1110 | |
| 1111 | return err; |
| 1112 | } |
| 1113 | |
| 1114 | int ip6mr_sk_done(struct sock *sk) |
| 1115 | { |
| 1116 | int err = 0; |
| 1117 | |
| 1118 | rtnl_lock(); |
| 1119 | if (sk == mroute6_socket) { |
| 1120 | write_lock_bh(&mrt_lock); |
| 1121 | mroute6_socket = NULL; |
| 1122 | write_unlock_bh(&mrt_lock); |
| 1123 | |
| 1124 | mroute_clean_tables(sk); |
| 1125 | } else |
| 1126 | err = -EACCES; |
| 1127 | rtnl_unlock(); |
| 1128 | |
| 1129 | return err; |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * Socket options and virtual interface manipulation. The whole |
| 1134 | * virtual interface system is a complete heap, but unfortunately |
| 1135 | * that's how BSD mrouted happens to think. Maybe one day with a proper |
| 1136 | * MOSPF/PIM router set up we can clean this up. |
| 1137 | */ |
| 1138 | |
| 1139 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) |
| 1140 | { |
| 1141 | int ret; |
| 1142 | struct mif6ctl vif; |
| 1143 | struct mf6cctl mfc; |
| 1144 | mifi_t mifi; |
| 1145 | |
| 1146 | if (optname != MRT6_INIT) { |
| 1147 | if (sk != mroute6_socket && !capable(CAP_NET_ADMIN)) |
| 1148 | return -EACCES; |
| 1149 | } |
| 1150 | |
| 1151 | switch (optname) { |
| 1152 | case MRT6_INIT: |
| 1153 | if (sk->sk_type != SOCK_RAW || |
| 1154 | inet_sk(sk)->num != IPPROTO_ICMPV6) |
| 1155 | return -EOPNOTSUPP; |
| 1156 | if (optlen < sizeof(int)) |
| 1157 | return -EINVAL; |
| 1158 | |
| 1159 | return ip6mr_sk_init(sk); |
| 1160 | |
| 1161 | case MRT6_DONE: |
| 1162 | return ip6mr_sk_done(sk); |
| 1163 | |
| 1164 | case MRT6_ADD_MIF: |
| 1165 | if (optlen < sizeof(vif)) |
| 1166 | return -EINVAL; |
| 1167 | if (copy_from_user(&vif, optval, sizeof(vif))) |
| 1168 | return -EFAULT; |
Rami Rosen | 6ac7eb0 | 2008-04-10 12:40:10 +0300 | [diff] [blame] | 1169 | if (vif.mif6c_mifi >= MAXMIFS) |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1170 | return -ENFILE; |
| 1171 | rtnl_lock(); |
| 1172 | ret = mif6_add(&vif, sk == mroute6_socket); |
| 1173 | rtnl_unlock(); |
| 1174 | return ret; |
| 1175 | |
| 1176 | case MRT6_DEL_MIF: |
| 1177 | if (optlen < sizeof(mifi_t)) |
| 1178 | return -EINVAL; |
| 1179 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) |
| 1180 | return -EFAULT; |
| 1181 | rtnl_lock(); |
| 1182 | ret = mif6_delete(mifi); |
| 1183 | rtnl_unlock(); |
| 1184 | return ret; |
| 1185 | |
| 1186 | /* |
| 1187 | * Manipulate the forwarding caches. These live |
| 1188 | * in a sort of kernel/user symbiosis. |
| 1189 | */ |
| 1190 | case MRT6_ADD_MFC: |
| 1191 | case MRT6_DEL_MFC: |
| 1192 | if (optlen < sizeof(mfc)) |
| 1193 | return -EINVAL; |
| 1194 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
| 1195 | return -EFAULT; |
| 1196 | rtnl_lock(); |
| 1197 | if (optname == MRT6_DEL_MFC) |
| 1198 | ret = ip6mr_mfc_delete(&mfc); |
| 1199 | else |
| 1200 | ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket); |
| 1201 | rtnl_unlock(); |
| 1202 | return ret; |
| 1203 | |
| 1204 | /* |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1205 | * Control PIM assert (to activate pim will activate assert) |
| 1206 | */ |
| 1207 | case MRT6_ASSERT: |
| 1208 | { |
| 1209 | int v; |
| 1210 | if (get_user(v, (int __user *)optval)) |
| 1211 | return -EFAULT; |
| 1212 | mroute_do_assert = !!v; |
| 1213 | return 0; |
| 1214 | } |
| 1215 | |
| 1216 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1217 | case MRT6_PIM: |
| 1218 | { |
YOSHIFUJI Hideaki | a9f83bf | 2008-04-10 15:41:28 +0900 | [diff] [blame] | 1219 | int v; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1220 | if (get_user(v, (int __user *)optval)) |
| 1221 | return -EFAULT; |
| 1222 | v = !!v; |
| 1223 | rtnl_lock(); |
| 1224 | ret = 0; |
| 1225 | if (v != mroute_do_pim) { |
| 1226 | mroute_do_pim = v; |
| 1227 | mroute_do_assert = v; |
| 1228 | if (mroute_do_pim) |
| 1229 | ret = inet6_add_protocol(&pim6_protocol, |
| 1230 | IPPROTO_PIM); |
| 1231 | else |
| 1232 | ret = inet6_del_protocol(&pim6_protocol, |
| 1233 | IPPROTO_PIM); |
| 1234 | if (ret < 0) |
| 1235 | ret = -EAGAIN; |
| 1236 | } |
| 1237 | rtnl_unlock(); |
| 1238 | return ret; |
| 1239 | } |
| 1240 | |
| 1241 | #endif |
| 1242 | /* |
Rami Rosen | 7d120c5 | 2008-04-23 14:35:13 +0300 | [diff] [blame] | 1243 | * Spurious command, or MRT6_VERSION which you cannot |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1244 | * set. |
| 1245 | */ |
| 1246 | default: |
| 1247 | return -ENOPROTOOPT; |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | /* |
| 1252 | * Getsock opt support for the multicast routing system. |
| 1253 | */ |
| 1254 | |
| 1255 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, |
| 1256 | int __user *optlen) |
| 1257 | { |
| 1258 | int olr; |
| 1259 | int val; |
| 1260 | |
| 1261 | switch (optname) { |
| 1262 | case MRT6_VERSION: |
| 1263 | val = 0x0305; |
| 1264 | break; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1265 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1266 | case MRT6_PIM: |
| 1267 | val = mroute_do_pim; |
| 1268 | break; |
| 1269 | #endif |
| 1270 | case MRT6_ASSERT: |
| 1271 | val = mroute_do_assert; |
| 1272 | break; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1273 | default: |
| 1274 | return -ENOPROTOOPT; |
| 1275 | } |
| 1276 | |
| 1277 | if (get_user(olr, optlen)) |
| 1278 | return -EFAULT; |
| 1279 | |
| 1280 | olr = min_t(int, olr, sizeof(int)); |
| 1281 | if (olr < 0) |
| 1282 | return -EINVAL; |
| 1283 | |
| 1284 | if (put_user(olr, optlen)) |
| 1285 | return -EFAULT; |
| 1286 | if (copy_to_user(optval, &val, olr)) |
| 1287 | return -EFAULT; |
| 1288 | return 0; |
| 1289 | } |
| 1290 | |
| 1291 | /* |
| 1292 | * The IP multicast ioctl support routines. |
| 1293 | */ |
| 1294 | |
| 1295 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| 1296 | { |
| 1297 | struct sioc_sg_req6 sr; |
| 1298 | struct sioc_mif_req6 vr; |
| 1299 | struct mif_device *vif; |
| 1300 | struct mfc6_cache *c; |
| 1301 | |
| 1302 | switch (cmd) { |
| 1303 | case SIOCGETMIFCNT_IN6: |
| 1304 | if (copy_from_user(&vr, arg, sizeof(vr))) |
| 1305 | return -EFAULT; |
| 1306 | if (vr.mifi >= maxvif) |
| 1307 | return -EINVAL; |
| 1308 | read_lock(&mrt_lock); |
| 1309 | vif = &vif6_table[vr.mifi]; |
| 1310 | if (MIF_EXISTS(vr.mifi)) { |
| 1311 | vr.icount = vif->pkt_in; |
| 1312 | vr.ocount = vif->pkt_out; |
| 1313 | vr.ibytes = vif->bytes_in; |
| 1314 | vr.obytes = vif->bytes_out; |
| 1315 | read_unlock(&mrt_lock); |
| 1316 | |
| 1317 | if (copy_to_user(arg, &vr, sizeof(vr))) |
| 1318 | return -EFAULT; |
| 1319 | return 0; |
| 1320 | } |
| 1321 | read_unlock(&mrt_lock); |
| 1322 | return -EADDRNOTAVAIL; |
| 1323 | case SIOCGETSGCNT_IN6: |
| 1324 | if (copy_from_user(&sr, arg, sizeof(sr))) |
| 1325 | return -EFAULT; |
| 1326 | |
| 1327 | read_lock(&mrt_lock); |
| 1328 | c = ip6mr_cache_find(&sr.src.sin6_addr, &sr.grp.sin6_addr); |
| 1329 | if (c) { |
| 1330 | sr.pktcnt = c->mfc_un.res.pkt; |
| 1331 | sr.bytecnt = c->mfc_un.res.bytes; |
| 1332 | sr.wrong_if = c->mfc_un.res.wrong_if; |
| 1333 | read_unlock(&mrt_lock); |
| 1334 | |
| 1335 | if (copy_to_user(arg, &sr, sizeof(sr))) |
| 1336 | return -EFAULT; |
| 1337 | return 0; |
| 1338 | } |
| 1339 | read_unlock(&mrt_lock); |
| 1340 | return -EADDRNOTAVAIL; |
| 1341 | default: |
| 1342 | return -ENOIOCTLCMD; |
| 1343 | } |
| 1344 | } |
| 1345 | |
| 1346 | |
| 1347 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) |
| 1348 | { |
Rami Rosen | 0912ea3 | 2008-04-13 23:59:13 -0700 | [diff] [blame] | 1349 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1350 | return dst_output(skb); |
| 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * Processing handlers for ip6mr_forward |
| 1355 | */ |
| 1356 | |
| 1357 | static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi) |
| 1358 | { |
| 1359 | struct ipv6hdr *ipv6h; |
| 1360 | struct mif_device *vif = &vif6_table[vifi]; |
| 1361 | struct net_device *dev; |
| 1362 | struct dst_entry *dst; |
| 1363 | struct flowi fl; |
| 1364 | |
| 1365 | if (vif->dev == NULL) |
| 1366 | goto out_free; |
| 1367 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1368 | #ifdef CONFIG_IPV6_PIMSM_V2 |
| 1369 | if (vif->flags & MIFF_REGISTER) { |
| 1370 | vif->pkt_out++; |
| 1371 | vif->bytes_out += skb->len; |
Pavel Emelyanov | dc58c78 | 2008-05-21 14:17:54 -0700 | [diff] [blame] | 1372 | vif->dev->stats.tx_bytes += skb->len; |
| 1373 | vif->dev->stats.tx_packets++; |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1374 | ip6mr_cache_report(skb, vifi, MRT6MSG_WHOLEPKT); |
| 1375 | kfree_skb(skb); |
| 1376 | return 0; |
| 1377 | } |
| 1378 | #endif |
| 1379 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1380 | ipv6h = ipv6_hdr(skb); |
| 1381 | |
| 1382 | fl = (struct flowi) { |
| 1383 | .oif = vif->link, |
| 1384 | .nl_u = { .ip6_u = |
| 1385 | { .daddr = ipv6h->daddr, } |
| 1386 | } |
| 1387 | }; |
| 1388 | |
| 1389 | dst = ip6_route_output(&init_net, NULL, &fl); |
| 1390 | if (!dst) |
| 1391 | goto out_free; |
| 1392 | |
| 1393 | dst_release(skb->dst); |
| 1394 | skb->dst = dst; |
| 1395 | |
| 1396 | /* |
| 1397 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
| 1398 | * not only before forwarding, but after forwarding on all output |
| 1399 | * interfaces. It is clear, if mrouter runs a multicasting |
| 1400 | * program, it should receive packets not depending to what interface |
| 1401 | * program is joined. |
| 1402 | * If we will not make it, the program will have to join on all |
| 1403 | * interfaces. On the other hand, multihoming host (or router, but |
| 1404 | * not mrouter) cannot join to more than one interface - it will |
| 1405 | * result in receiving multiple packets. |
| 1406 | */ |
| 1407 | dev = vif->dev; |
| 1408 | skb->dev = dev; |
| 1409 | vif->pkt_out++; |
| 1410 | vif->bytes_out += skb->len; |
| 1411 | |
| 1412 | /* We are about to write */ |
| 1413 | /* XXX: extension headers? */ |
| 1414 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) |
| 1415 | goto out_free; |
| 1416 | |
| 1417 | ipv6h = ipv6_hdr(skb); |
| 1418 | ipv6h->hop_limit--; |
| 1419 | |
| 1420 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; |
| 1421 | |
| 1422 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev, |
| 1423 | ip6mr_forward2_finish); |
| 1424 | |
| 1425 | out_free: |
| 1426 | kfree_skb(skb); |
| 1427 | return 0; |
| 1428 | } |
| 1429 | |
| 1430 | static int ip6mr_find_vif(struct net_device *dev) |
| 1431 | { |
| 1432 | int ct; |
| 1433 | for (ct = maxvif - 1; ct >= 0; ct--) { |
| 1434 | if (vif6_table[ct].dev == dev) |
| 1435 | break; |
| 1436 | } |
| 1437 | return ct; |
| 1438 | } |
| 1439 | |
| 1440 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache) |
| 1441 | { |
| 1442 | int psend = -1; |
| 1443 | int vif, ct; |
| 1444 | |
| 1445 | vif = cache->mf6c_parent; |
| 1446 | cache->mfc_un.res.pkt++; |
| 1447 | cache->mfc_un.res.bytes += skb->len; |
| 1448 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1449 | /* |
| 1450 | * Wrong interface: drop packet and (maybe) send PIM assert. |
| 1451 | */ |
| 1452 | if (vif6_table[vif].dev != skb->dev) { |
| 1453 | int true_vifi; |
| 1454 | |
| 1455 | cache->mfc_un.res.wrong_if++; |
| 1456 | true_vifi = ip6mr_find_vif(skb->dev); |
| 1457 | |
| 1458 | if (true_vifi >= 0 && mroute_do_assert && |
| 1459 | /* pimsm uses asserts, when switching from RPT to SPT, |
| 1460 | so that we cannot check that packet arrived on an oif. |
| 1461 | It is bad, but otherwise we would need to move pretty |
| 1462 | large chunk of pimd to kernel. Ough... --ANK |
| 1463 | */ |
| 1464 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && |
| 1465 | time_after(jiffies, |
| 1466 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
| 1467 | cache->mfc_un.res.last_assert = jiffies; |
| 1468 | ip6mr_cache_report(skb, true_vifi, MRT6MSG_WRONGMIF); |
| 1469 | } |
| 1470 | goto dont_forward; |
| 1471 | } |
| 1472 | |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1473 | vif6_table[vif].pkt_in++; |
| 1474 | vif6_table[vif].bytes_in += skb->len; |
| 1475 | |
| 1476 | /* |
| 1477 | * Forward the frame |
| 1478 | */ |
| 1479 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { |
| 1480 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { |
| 1481 | if (psend != -1) { |
| 1482 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1483 | if (skb2) |
| 1484 | ip6mr_forward2(skb2, cache, psend); |
| 1485 | } |
| 1486 | psend = ct; |
| 1487 | } |
| 1488 | } |
| 1489 | if (psend != -1) { |
| 1490 | ip6mr_forward2(skb, cache, psend); |
| 1491 | return 0; |
| 1492 | } |
| 1493 | |
YOSHIFUJI Hideaki | 14fb64e | 2008-04-03 09:22:54 +0900 | [diff] [blame] | 1494 | dont_forward: |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1495 | kfree_skb(skb); |
| 1496 | return 0; |
| 1497 | } |
| 1498 | |
| 1499 | |
| 1500 | /* |
| 1501 | * Multicast packets for forwarding arrive here |
| 1502 | */ |
| 1503 | |
| 1504 | int ip6_mr_input(struct sk_buff *skb) |
| 1505 | { |
| 1506 | struct mfc6_cache *cache; |
| 1507 | |
| 1508 | read_lock(&mrt_lock); |
| 1509 | cache = ip6mr_cache_find(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
| 1510 | |
| 1511 | /* |
| 1512 | * No usable cache entry |
| 1513 | */ |
| 1514 | if (cache == NULL) { |
| 1515 | int vif; |
| 1516 | |
| 1517 | vif = ip6mr_find_vif(skb->dev); |
| 1518 | if (vif >= 0) { |
| 1519 | int err = ip6mr_cache_unresolved(vif, skb); |
| 1520 | read_unlock(&mrt_lock); |
| 1521 | |
| 1522 | return err; |
| 1523 | } |
| 1524 | read_unlock(&mrt_lock); |
| 1525 | kfree_skb(skb); |
| 1526 | return -ENODEV; |
| 1527 | } |
| 1528 | |
| 1529 | ip6_mr_forward(skb, cache); |
| 1530 | |
| 1531 | read_unlock(&mrt_lock); |
| 1532 | |
| 1533 | return 0; |
| 1534 | } |
| 1535 | |
| 1536 | |
| 1537 | static int |
| 1538 | ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm) |
| 1539 | { |
| 1540 | int ct; |
| 1541 | struct rtnexthop *nhp; |
| 1542 | struct net_device *dev = vif6_table[c->mf6c_parent].dev; |
YOSHIFUJI Hideaki | 549e028 | 2008-04-05 22:17:39 +0900 | [diff] [blame] | 1543 | u8 *b = skb_tail_pointer(skb); |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1544 | struct rtattr *mp_head; |
| 1545 | |
| 1546 | if (dev) |
| 1547 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); |
| 1548 | |
| 1549 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
| 1550 | |
| 1551 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| 1552 | if (c->mfc_un.res.ttls[ct] < 255) { |
| 1553 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
| 1554 | goto rtattr_failure; |
| 1555 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
| 1556 | nhp->rtnh_flags = 0; |
| 1557 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
| 1558 | nhp->rtnh_ifindex = vif6_table[ct].dev->ifindex; |
| 1559 | nhp->rtnh_len = sizeof(*nhp); |
| 1560 | } |
| 1561 | } |
| 1562 | mp_head->rta_type = RTA_MULTIPATH; |
YOSHIFUJI Hideaki | 549e028 | 2008-04-05 22:17:39 +0900 | [diff] [blame] | 1563 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 1564 | rtm->rtm_type = RTN_MULTICAST; |
| 1565 | return 1; |
| 1566 | |
| 1567 | rtattr_failure: |
| 1568 | nlmsg_trim(skb, b); |
| 1569 | return -EMSGSIZE; |
| 1570 | } |
| 1571 | |
| 1572 | int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) |
| 1573 | { |
| 1574 | int err; |
| 1575 | struct mfc6_cache *cache; |
| 1576 | struct rt6_info *rt = (struct rt6_info *)skb->dst; |
| 1577 | |
| 1578 | read_lock(&mrt_lock); |
| 1579 | cache = ip6mr_cache_find(&rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
| 1580 | |
| 1581 | if (!cache) { |
| 1582 | struct sk_buff *skb2; |
| 1583 | struct ipv6hdr *iph; |
| 1584 | struct net_device *dev; |
| 1585 | int vif; |
| 1586 | |
| 1587 | if (nowait) { |
| 1588 | read_unlock(&mrt_lock); |
| 1589 | return -EAGAIN; |
| 1590 | } |
| 1591 | |
| 1592 | dev = skb->dev; |
| 1593 | if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) { |
| 1594 | read_unlock(&mrt_lock); |
| 1595 | return -ENODEV; |
| 1596 | } |
| 1597 | |
| 1598 | /* really correct? */ |
| 1599 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| 1600 | if (!skb2) { |
| 1601 | read_unlock(&mrt_lock); |
| 1602 | return -ENOMEM; |
| 1603 | } |
| 1604 | |
| 1605 | skb_reset_transport_header(skb2); |
| 1606 | |
| 1607 | skb_put(skb2, sizeof(struct ipv6hdr)); |
| 1608 | skb_reset_network_header(skb2); |
| 1609 | |
| 1610 | iph = ipv6_hdr(skb2); |
| 1611 | iph->version = 0; |
| 1612 | iph->priority = 0; |
| 1613 | iph->flow_lbl[0] = 0; |
| 1614 | iph->flow_lbl[1] = 0; |
| 1615 | iph->flow_lbl[2] = 0; |
| 1616 | iph->payload_len = 0; |
| 1617 | iph->nexthdr = IPPROTO_NONE; |
| 1618 | iph->hop_limit = 0; |
| 1619 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); |
| 1620 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); |
| 1621 | |
| 1622 | err = ip6mr_cache_unresolved(vif, skb2); |
| 1623 | read_unlock(&mrt_lock); |
| 1624 | |
| 1625 | return err; |
| 1626 | } |
| 1627 | |
| 1628 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) |
| 1629 | cache->mfc_flags |= MFC_NOTIFY; |
| 1630 | |
| 1631 | err = ip6mr_fill_mroute(skb, cache, rtm); |
| 1632 | read_unlock(&mrt_lock); |
| 1633 | return err; |
| 1634 | } |
| 1635 | |