Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IP multicast routing support for mrouted 3.6/3.8 |
| 3 | * |
| 4 | * (c) 1995 Alan Cox, <alan@redhat.com> |
| 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 | * Version: $Id: ipmr.c,v 1.65 2001/10/31 21:55:54 davem Exp $ |
| 13 | * |
| 14 | * Fixes: |
| 15 | * Michael Chastain : Incorrect size of copying. |
| 16 | * Alan Cox : Added the cache manager code |
| 17 | * Alan Cox : Fixed the clone/copy bug and device race. |
| 18 | * Mike McLagan : Routing by source |
| 19 | * Malcolm Beattie : Buffer handling fixes. |
| 20 | * Alexey Kuznetsov : Double buffer free and other fixes. |
| 21 | * SVR Anand : Fixed several multicast bugs and problems. |
| 22 | * Alexey Kuznetsov : Status, optimisations and more. |
| 23 | * Brad Parker : Better behaviour on mrouted upcall |
| 24 | * overflow. |
| 25 | * Carlos Picoto : PIMv1 Support |
| 26 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header |
| 27 | * Relax this requrement to work with older peers. |
| 28 | * |
| 29 | */ |
| 30 | |
| 31 | #include <linux/config.h> |
| 32 | #include <asm/system.h> |
| 33 | #include <asm/uaccess.h> |
| 34 | #include <linux/types.h> |
| 35 | #include <linux/sched.h> |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 36 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/errno.h> |
| 38 | #include <linux/timer.h> |
| 39 | #include <linux/mm.h> |
| 40 | #include <linux/kernel.h> |
| 41 | #include <linux/fcntl.h> |
| 42 | #include <linux/stat.h> |
| 43 | #include <linux/socket.h> |
| 44 | #include <linux/in.h> |
| 45 | #include <linux/inet.h> |
| 46 | #include <linux/netdevice.h> |
| 47 | #include <linux/inetdevice.h> |
| 48 | #include <linux/igmp.h> |
| 49 | #include <linux/proc_fs.h> |
| 50 | #include <linux/seq_file.h> |
| 51 | #include <linux/mroute.h> |
| 52 | #include <linux/init.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 53 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <net/ip.h> |
| 55 | #include <net/protocol.h> |
| 56 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 57 | #include <net/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <net/sock.h> |
| 59 | #include <net/icmp.h> |
| 60 | #include <net/udp.h> |
| 61 | #include <net/raw.h> |
| 62 | #include <linux/notifier.h> |
| 63 | #include <linux/if_arp.h> |
| 64 | #include <linux/netfilter_ipv4.h> |
| 65 | #include <net/ipip.h> |
| 66 | #include <net/checksum.h> |
| 67 | |
| 68 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
| 69 | #define CONFIG_IP_PIMSM 1 |
| 70 | #endif |
| 71 | |
| 72 | static struct sock *mroute_socket; |
| 73 | |
| 74 | |
| 75 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
| 76 | Note that the changes are semaphored via rtnl_lock. |
| 77 | */ |
| 78 | |
| 79 | static DEFINE_RWLOCK(mrt_lock); |
| 80 | |
| 81 | /* |
| 82 | * Multicast router control variables |
| 83 | */ |
| 84 | |
| 85 | static struct vif_device vif_table[MAXVIFS]; /* Devices */ |
| 86 | static int maxvif; |
| 87 | |
| 88 | #define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) |
| 89 | |
| 90 | static int mroute_do_assert; /* Set in PIM assert */ |
| 91 | static int mroute_do_pim; |
| 92 | |
| 93 | static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ |
| 94 | |
| 95 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
| 96 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ |
| 97 | |
| 98 | /* Special spinlock for queue of unresolved entries */ |
| 99 | static DEFINE_SPINLOCK(mfc_unres_lock); |
| 100 | |
| 101 | /* We return to original Alan's scheme. Hash table of resolved |
| 102 | entries is changed only in process context and protected |
| 103 | with weak lock mrt_lock. Queue of unresolved entries is protected |
| 104 | with strong spinlock mfc_unres_lock. |
| 105 | |
| 106 | In this case data path is free of exclusive locks at all. |
| 107 | */ |
| 108 | |
Eric Dumazet | ba89966 | 2005-08-26 12:05:31 -0700 | [diff] [blame] | 109 | static kmem_cache_t *mrt_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); |
| 112 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); |
| 113 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); |
| 114 | |
| 115 | #ifdef CONFIG_IP_PIMSM_V2 |
| 116 | static struct net_protocol pim_protocol; |
| 117 | #endif |
| 118 | |
| 119 | static struct timer_list ipmr_expire_timer; |
| 120 | |
| 121 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
| 122 | |
| 123 | static |
| 124 | struct net_device *ipmr_new_tunnel(struct vifctl *v) |
| 125 | { |
| 126 | struct net_device *dev; |
| 127 | |
| 128 | dev = __dev_get_by_name("tunl0"); |
| 129 | |
| 130 | if (dev) { |
| 131 | int err; |
| 132 | struct ifreq ifr; |
| 133 | mm_segment_t oldfs; |
| 134 | struct ip_tunnel_parm p; |
| 135 | struct in_device *in_dev; |
| 136 | |
| 137 | memset(&p, 0, sizeof(p)); |
| 138 | p.iph.daddr = v->vifc_rmt_addr.s_addr; |
| 139 | p.iph.saddr = v->vifc_lcl_addr.s_addr; |
| 140 | p.iph.version = 4; |
| 141 | p.iph.ihl = 5; |
| 142 | p.iph.protocol = IPPROTO_IPIP; |
| 143 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); |
| 144 | ifr.ifr_ifru.ifru_data = (void*)&p; |
| 145 | |
| 146 | oldfs = get_fs(); set_fs(KERNEL_DS); |
| 147 | err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); |
| 148 | set_fs(oldfs); |
| 149 | |
| 150 | dev = NULL; |
| 151 | |
| 152 | if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) { |
| 153 | dev->flags |= IFF_MULTICAST; |
| 154 | |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 155 | in_dev = __in_dev_get_rtnl(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL) |
| 157 | goto failure; |
| 158 | in_dev->cnf.rp_filter = 0; |
| 159 | |
| 160 | if (dev_open(dev)) |
| 161 | goto failure; |
| 162 | } |
| 163 | } |
| 164 | return dev; |
| 165 | |
| 166 | failure: |
| 167 | /* allow the register to be completed before unregistering. */ |
| 168 | rtnl_unlock(); |
| 169 | rtnl_lock(); |
| 170 | |
| 171 | unregister_netdevice(dev); |
| 172 | return NULL; |
| 173 | } |
| 174 | |
| 175 | #ifdef CONFIG_IP_PIMSM |
| 176 | |
| 177 | static int reg_vif_num = -1; |
| 178 | |
| 179 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
| 180 | { |
| 181 | read_lock(&mrt_lock); |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 182 | ((struct net_device_stats*)netdev_priv(dev))->tx_bytes += skb->len; |
| 183 | ((struct net_device_stats*)netdev_priv(dev))->tx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); |
| 185 | read_unlock(&mrt_lock); |
| 186 | kfree_skb(skb); |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static struct net_device_stats *reg_vif_get_stats(struct net_device *dev) |
| 191 | { |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 192 | return (struct net_device_stats*)netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | static void reg_vif_setup(struct net_device *dev) |
| 196 | { |
| 197 | dev->type = ARPHRD_PIMREG; |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 198 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | dev->flags = IFF_NOARP; |
| 200 | dev->hard_start_xmit = reg_vif_xmit; |
| 201 | dev->get_stats = reg_vif_get_stats; |
| 202 | dev->destructor = free_netdev; |
| 203 | } |
| 204 | |
| 205 | static struct net_device *ipmr_reg_vif(void) |
| 206 | { |
| 207 | struct net_device *dev; |
| 208 | struct in_device *in_dev; |
| 209 | |
| 210 | dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg", |
| 211 | reg_vif_setup); |
| 212 | |
| 213 | if (dev == NULL) |
| 214 | return NULL; |
| 215 | |
| 216 | if (register_netdevice(dev)) { |
| 217 | free_netdev(dev); |
| 218 | return NULL; |
| 219 | } |
| 220 | dev->iflink = 0; |
| 221 | |
| 222 | if ((in_dev = inetdev_init(dev)) == NULL) |
| 223 | goto failure; |
| 224 | |
| 225 | in_dev->cnf.rp_filter = 0; |
| 226 | |
| 227 | if (dev_open(dev)) |
| 228 | goto failure; |
| 229 | |
| 230 | return dev; |
| 231 | |
| 232 | failure: |
| 233 | /* allow the register to be completed before unregistering. */ |
| 234 | rtnl_unlock(); |
| 235 | rtnl_lock(); |
| 236 | |
| 237 | unregister_netdevice(dev); |
| 238 | return NULL; |
| 239 | } |
| 240 | #endif |
| 241 | |
| 242 | /* |
| 243 | * Delete a VIF entry |
| 244 | */ |
| 245 | |
| 246 | static int vif_delete(int vifi) |
| 247 | { |
| 248 | struct vif_device *v; |
| 249 | struct net_device *dev; |
| 250 | struct in_device *in_dev; |
| 251 | |
| 252 | if (vifi < 0 || vifi >= maxvif) |
| 253 | return -EADDRNOTAVAIL; |
| 254 | |
| 255 | v = &vif_table[vifi]; |
| 256 | |
| 257 | write_lock_bh(&mrt_lock); |
| 258 | dev = v->dev; |
| 259 | v->dev = NULL; |
| 260 | |
| 261 | if (!dev) { |
| 262 | write_unlock_bh(&mrt_lock); |
| 263 | return -EADDRNOTAVAIL; |
| 264 | } |
| 265 | |
| 266 | #ifdef CONFIG_IP_PIMSM |
| 267 | if (vifi == reg_vif_num) |
| 268 | reg_vif_num = -1; |
| 269 | #endif |
| 270 | |
| 271 | if (vifi+1 == maxvif) { |
| 272 | int tmp; |
| 273 | for (tmp=vifi-1; tmp>=0; tmp--) { |
| 274 | if (VIF_EXISTS(tmp)) |
| 275 | break; |
| 276 | } |
| 277 | maxvif = tmp+1; |
| 278 | } |
| 279 | |
| 280 | write_unlock_bh(&mrt_lock); |
| 281 | |
| 282 | dev_set_allmulti(dev, -1); |
| 283 | |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 284 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | in_dev->cnf.mc_forwarding--; |
| 286 | ip_rt_multicast_event(in_dev); |
| 287 | } |
| 288 | |
| 289 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) |
| 290 | unregister_netdevice(dev); |
| 291 | |
| 292 | dev_put(dev); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | /* Destroy an unresolved cache entry, killing queued skbs |
| 297 | and reporting error to netlink readers. |
| 298 | */ |
| 299 | |
| 300 | static void ipmr_destroy_unres(struct mfc_cache *c) |
| 301 | { |
| 302 | struct sk_buff *skb; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 303 | struct nlmsgerr *e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | atomic_dec(&cache_resolve_queue_len); |
| 306 | |
| 307 | while((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { |
| 308 | if (skb->nh.iph->version == 0) { |
| 309 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
| 310 | nlh->nlmsg_type = NLMSG_ERROR; |
| 311 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| 312 | skb_trim(skb, nlh->nlmsg_len); |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 313 | e = NLMSG_DATA(nlh); |
| 314 | e->error = -ETIMEDOUT; |
| 315 | memset(&e->msg, 0, sizeof(e->msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); |
| 317 | } else |
| 318 | kfree_skb(skb); |
| 319 | } |
| 320 | |
| 321 | kmem_cache_free(mrt_cachep, c); |
| 322 | } |
| 323 | |
| 324 | |
| 325 | /* Single timer process for all the unresolved queue. */ |
| 326 | |
| 327 | static void ipmr_expire_process(unsigned long dummy) |
| 328 | { |
| 329 | unsigned long now; |
| 330 | unsigned long expires; |
| 331 | struct mfc_cache *c, **cp; |
| 332 | |
| 333 | if (!spin_trylock(&mfc_unres_lock)) { |
| 334 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); |
| 335 | return; |
| 336 | } |
| 337 | |
| 338 | if (atomic_read(&cache_resolve_queue_len) == 0) |
| 339 | goto out; |
| 340 | |
| 341 | now = jiffies; |
| 342 | expires = 10*HZ; |
| 343 | cp = &mfc_unres_queue; |
| 344 | |
| 345 | while ((c=*cp) != NULL) { |
| 346 | if (time_after(c->mfc_un.unres.expires, now)) { |
| 347 | unsigned long interval = c->mfc_un.unres.expires - now; |
| 348 | if (interval < expires) |
| 349 | expires = interval; |
| 350 | cp = &c->next; |
| 351 | continue; |
| 352 | } |
| 353 | |
| 354 | *cp = c->next; |
| 355 | |
| 356 | ipmr_destroy_unres(c); |
| 357 | } |
| 358 | |
| 359 | if (atomic_read(&cache_resolve_queue_len)) |
| 360 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
| 361 | |
| 362 | out: |
| 363 | spin_unlock(&mfc_unres_lock); |
| 364 | } |
| 365 | |
| 366 | /* Fill oifs list. It is called under write locked mrt_lock. */ |
| 367 | |
Baruch Even | d1b04c0 | 2005-07-30 17:41:59 -0700 | [diff] [blame] | 368 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | { |
| 370 | int vifi; |
| 371 | |
| 372 | cache->mfc_un.res.minvif = MAXVIFS; |
| 373 | cache->mfc_un.res.maxvif = 0; |
| 374 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); |
| 375 | |
| 376 | for (vifi=0; vifi<maxvif; vifi++) { |
| 377 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { |
| 378 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
| 379 | if (cache->mfc_un.res.minvif > vifi) |
| 380 | cache->mfc_un.res.minvif = vifi; |
| 381 | if (cache->mfc_un.res.maxvif <= vifi) |
| 382 | cache->mfc_un.res.maxvif = vifi + 1; |
| 383 | } |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | static int vif_add(struct vifctl *vifc, int mrtsock) |
| 388 | { |
| 389 | int vifi = vifc->vifc_vifi; |
| 390 | struct vif_device *v = &vif_table[vifi]; |
| 391 | struct net_device *dev; |
| 392 | struct in_device *in_dev; |
| 393 | |
| 394 | /* Is vif busy ? */ |
| 395 | if (VIF_EXISTS(vifi)) |
| 396 | return -EADDRINUSE; |
| 397 | |
| 398 | switch (vifc->vifc_flags) { |
| 399 | #ifdef CONFIG_IP_PIMSM |
| 400 | case VIFF_REGISTER: |
| 401 | /* |
| 402 | * Special Purpose VIF in PIM |
| 403 | * All the packets will be sent to the daemon |
| 404 | */ |
| 405 | if (reg_vif_num >= 0) |
| 406 | return -EADDRINUSE; |
| 407 | dev = ipmr_reg_vif(); |
| 408 | if (!dev) |
| 409 | return -ENOBUFS; |
| 410 | break; |
| 411 | #endif |
| 412 | case VIFF_TUNNEL: |
| 413 | dev = ipmr_new_tunnel(vifc); |
| 414 | if (!dev) |
| 415 | return -ENOBUFS; |
| 416 | break; |
| 417 | case 0: |
Stephen Hemminger | 1533306 | 2006-03-20 22:32:28 -0800 | [diff] [blame^] | 418 | dev = ip_dev_find(vifc->vifc_lcl_addr.s_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (!dev) |
| 420 | return -EADDRNOTAVAIL; |
Stephen Hemminger | 1533306 | 2006-03-20 22:32:28 -0800 | [diff] [blame^] | 421 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | break; |
| 423 | default: |
| 424 | return -EINVAL; |
| 425 | } |
| 426 | |
Herbert Xu | e5ed639 | 2005-10-03 14:35:55 -0700 | [diff] [blame] | 427 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | return -EADDRNOTAVAIL; |
| 429 | in_dev->cnf.mc_forwarding++; |
| 430 | dev_set_allmulti(dev, +1); |
| 431 | ip_rt_multicast_event(in_dev); |
| 432 | |
| 433 | /* |
| 434 | * Fill in the VIF structures |
| 435 | */ |
| 436 | v->rate_limit=vifc->vifc_rate_limit; |
| 437 | v->local=vifc->vifc_lcl_addr.s_addr; |
| 438 | v->remote=vifc->vifc_rmt_addr.s_addr; |
| 439 | v->flags=vifc->vifc_flags; |
| 440 | if (!mrtsock) |
| 441 | v->flags |= VIFF_STATIC; |
| 442 | v->threshold=vifc->vifc_threshold; |
| 443 | v->bytes_in = 0; |
| 444 | v->bytes_out = 0; |
| 445 | v->pkt_in = 0; |
| 446 | v->pkt_out = 0; |
| 447 | v->link = dev->ifindex; |
| 448 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) |
| 449 | v->link = dev->iflink; |
| 450 | |
| 451 | /* And finish update writing critical data */ |
| 452 | write_lock_bh(&mrt_lock); |
| 453 | dev_hold(dev); |
| 454 | v->dev=dev; |
| 455 | #ifdef CONFIG_IP_PIMSM |
| 456 | if (v->flags&VIFF_REGISTER) |
| 457 | reg_vif_num = vifi; |
| 458 | #endif |
| 459 | if (vifi+1 > maxvif) |
| 460 | maxvif = vifi+1; |
| 461 | write_unlock_bh(&mrt_lock); |
| 462 | return 0; |
| 463 | } |
| 464 | |
| 465 | static struct mfc_cache *ipmr_cache_find(__u32 origin, __u32 mcastgrp) |
| 466 | { |
| 467 | int line=MFC_HASH(mcastgrp,origin); |
| 468 | struct mfc_cache *c; |
| 469 | |
| 470 | for (c=mfc_cache_array[line]; c; c = c->next) { |
| 471 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) |
| 472 | break; |
| 473 | } |
| 474 | return c; |
| 475 | } |
| 476 | |
| 477 | /* |
| 478 | * Allocate a multicast cache entry |
| 479 | */ |
| 480 | static struct mfc_cache *ipmr_cache_alloc(void) |
| 481 | { |
| 482 | struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_KERNEL); |
| 483 | if(c==NULL) |
| 484 | return NULL; |
| 485 | memset(c, 0, sizeof(*c)); |
| 486 | c->mfc_un.res.minvif = MAXVIFS; |
| 487 | return c; |
| 488 | } |
| 489 | |
| 490 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
| 491 | { |
| 492 | struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); |
| 493 | if(c==NULL) |
| 494 | return NULL; |
| 495 | memset(c, 0, sizeof(*c)); |
| 496 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
| 497 | c->mfc_un.unres.expires = jiffies + 10*HZ; |
| 498 | return c; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * A cache entry has gone into a resolved state from queued |
| 503 | */ |
| 504 | |
| 505 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
| 506 | { |
| 507 | struct sk_buff *skb; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 508 | struct nlmsgerr *e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
| 510 | /* |
| 511 | * Play the pending entries through our router |
| 512 | */ |
| 513 | |
| 514 | while((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
| 515 | if (skb->nh.iph->version == 0) { |
| 516 | int err; |
| 517 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
| 518 | |
| 519 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { |
| 520 | nlh->nlmsg_len = skb->tail - (u8*)nlh; |
| 521 | } else { |
| 522 | nlh->nlmsg_type = NLMSG_ERROR; |
| 523 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); |
| 524 | skb_trim(skb, nlh->nlmsg_len); |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 525 | e = NLMSG_DATA(nlh); |
| 526 | e->error = -EMSGSIZE; |
| 527 | memset(&e->msg, 0, sizeof(e->msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); |
| 530 | } else |
| 531 | ip_mr_forward(skb, c, 0); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted |
| 537 | * expects the following bizarre scheme. |
| 538 | * |
| 539 | * Called under mrt_lock. |
| 540 | */ |
| 541 | |
| 542 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
| 543 | { |
| 544 | struct sk_buff *skb; |
| 545 | int ihl = pkt->nh.iph->ihl<<2; |
| 546 | struct igmphdr *igmp; |
| 547 | struct igmpmsg *msg; |
| 548 | int ret; |
| 549 | |
| 550 | #ifdef CONFIG_IP_PIMSM |
| 551 | if (assert == IGMPMSG_WHOLEPKT) |
| 552 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); |
| 553 | else |
| 554 | #endif |
| 555 | skb = alloc_skb(128, GFP_ATOMIC); |
| 556 | |
| 557 | if(!skb) |
| 558 | return -ENOBUFS; |
| 559 | |
| 560 | #ifdef CONFIG_IP_PIMSM |
| 561 | if (assert == IGMPMSG_WHOLEPKT) { |
| 562 | /* Ugly, but we have no choice with this interface. |
| 563 | Duplicate old header, fix ihl, length etc. |
| 564 | And all this only to mangle msg->im_msgtype and |
| 565 | to set msg->im_mbz to "mbz" :-) |
| 566 | */ |
| 567 | msg = (struct igmpmsg*)skb_push(skb, sizeof(struct iphdr)); |
| 568 | skb->nh.raw = skb->h.raw = (u8*)msg; |
| 569 | memcpy(msg, pkt->nh.raw, sizeof(struct iphdr)); |
| 570 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
| 571 | msg->im_mbz = 0; |
| 572 | msg->im_vif = reg_vif_num; |
| 573 | skb->nh.iph->ihl = sizeof(struct iphdr) >> 2; |
| 574 | skb->nh.iph->tot_len = htons(ntohs(pkt->nh.iph->tot_len) + sizeof(struct iphdr)); |
| 575 | } else |
| 576 | #endif |
| 577 | { |
| 578 | |
| 579 | /* |
| 580 | * Copy the IP header |
| 581 | */ |
| 582 | |
| 583 | skb->nh.iph = (struct iphdr *)skb_put(skb, ihl); |
| 584 | memcpy(skb->data,pkt->data,ihl); |
| 585 | skb->nh.iph->protocol = 0; /* Flag to the kernel this is a route add */ |
| 586 | msg = (struct igmpmsg*)skb->nh.iph; |
| 587 | msg->im_vif = vifi; |
| 588 | skb->dst = dst_clone(pkt->dst); |
| 589 | |
| 590 | /* |
| 591 | * Add our header |
| 592 | */ |
| 593 | |
| 594 | igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); |
| 595 | igmp->type = |
| 596 | msg->im_msgtype = assert; |
| 597 | igmp->code = 0; |
| 598 | skb->nh.iph->tot_len=htons(skb->len); /* Fix the length */ |
| 599 | skb->h.raw = skb->nh.raw; |
| 600 | } |
| 601 | |
| 602 | if (mroute_socket == NULL) { |
| 603 | kfree_skb(skb); |
| 604 | return -EINVAL; |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * Deliver to mrouted |
| 609 | */ |
| 610 | if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { |
| 611 | if (net_ratelimit()) |
| 612 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); |
| 613 | kfree_skb(skb); |
| 614 | } |
| 615 | |
| 616 | return ret; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Queue a packet for resolution. It gets locked cache entry! |
| 621 | */ |
| 622 | |
| 623 | static int |
| 624 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) |
| 625 | { |
| 626 | int err; |
| 627 | struct mfc_cache *c; |
| 628 | |
| 629 | spin_lock_bh(&mfc_unres_lock); |
| 630 | for (c=mfc_unres_queue; c; c=c->next) { |
| 631 | if (c->mfc_mcastgrp == skb->nh.iph->daddr && |
| 632 | c->mfc_origin == skb->nh.iph->saddr) |
| 633 | break; |
| 634 | } |
| 635 | |
| 636 | if (c == NULL) { |
| 637 | /* |
| 638 | * Create a new entry if allowable |
| 639 | */ |
| 640 | |
| 641 | if (atomic_read(&cache_resolve_queue_len)>=10 || |
| 642 | (c=ipmr_cache_alloc_unres())==NULL) { |
| 643 | spin_unlock_bh(&mfc_unres_lock); |
| 644 | |
| 645 | kfree_skb(skb); |
| 646 | return -ENOBUFS; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | * Fill in the new cache entry |
| 651 | */ |
| 652 | c->mfc_parent=-1; |
| 653 | c->mfc_origin=skb->nh.iph->saddr; |
| 654 | c->mfc_mcastgrp=skb->nh.iph->daddr; |
| 655 | |
| 656 | /* |
| 657 | * Reflect first query at mrouted. |
| 658 | */ |
| 659 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { |
| 660 | /* If the report failed throw the cache entry |
| 661 | out - Brad Parker |
| 662 | */ |
| 663 | spin_unlock_bh(&mfc_unres_lock); |
| 664 | |
| 665 | kmem_cache_free(mrt_cachep, c); |
| 666 | kfree_skb(skb); |
| 667 | return err; |
| 668 | } |
| 669 | |
| 670 | atomic_inc(&cache_resolve_queue_len); |
| 671 | c->next = mfc_unres_queue; |
| 672 | mfc_unres_queue = c; |
| 673 | |
| 674 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * See if we can append the packet |
| 679 | */ |
| 680 | if (c->mfc_un.unres.unresolved.qlen>3) { |
| 681 | kfree_skb(skb); |
| 682 | err = -ENOBUFS; |
| 683 | } else { |
| 684 | skb_queue_tail(&c->mfc_un.unres.unresolved,skb); |
| 685 | err = 0; |
| 686 | } |
| 687 | |
| 688 | spin_unlock_bh(&mfc_unres_lock); |
| 689 | return err; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * MFC cache manipulation by user space mroute daemon |
| 694 | */ |
| 695 | |
| 696 | static int ipmr_mfc_delete(struct mfcctl *mfc) |
| 697 | { |
| 698 | int line; |
| 699 | struct mfc_cache *c, **cp; |
| 700 | |
| 701 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
| 702 | |
| 703 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { |
| 704 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
| 705 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { |
| 706 | write_lock_bh(&mrt_lock); |
| 707 | *cp = c->next; |
| 708 | write_unlock_bh(&mrt_lock); |
| 709 | |
| 710 | kmem_cache_free(mrt_cachep, c); |
| 711 | return 0; |
| 712 | } |
| 713 | } |
| 714 | return -ENOENT; |
| 715 | } |
| 716 | |
| 717 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) |
| 718 | { |
| 719 | int line; |
| 720 | struct mfc_cache *uc, *c, **cp; |
| 721 | |
| 722 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
| 723 | |
| 724 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { |
| 725 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
| 726 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) |
| 727 | break; |
| 728 | } |
| 729 | |
| 730 | if (c != NULL) { |
| 731 | write_lock_bh(&mrt_lock); |
| 732 | c->mfc_parent = mfc->mfcc_parent; |
Baruch Even | d1b04c0 | 2005-07-30 17:41:59 -0700 | [diff] [blame] | 733 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | if (!mrtsock) |
| 735 | c->mfc_flags |= MFC_STATIC; |
| 736 | write_unlock_bh(&mrt_lock); |
| 737 | return 0; |
| 738 | } |
| 739 | |
| 740 | if(!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) |
| 741 | return -EINVAL; |
| 742 | |
| 743 | c=ipmr_cache_alloc(); |
| 744 | if (c==NULL) |
| 745 | return -ENOMEM; |
| 746 | |
| 747 | c->mfc_origin=mfc->mfcc_origin.s_addr; |
| 748 | c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; |
| 749 | c->mfc_parent=mfc->mfcc_parent; |
Baruch Even | d1b04c0 | 2005-07-30 17:41:59 -0700 | [diff] [blame] | 750 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | if (!mrtsock) |
| 752 | c->mfc_flags |= MFC_STATIC; |
| 753 | |
| 754 | write_lock_bh(&mrt_lock); |
| 755 | c->next = mfc_cache_array[line]; |
| 756 | mfc_cache_array[line] = c; |
| 757 | write_unlock_bh(&mrt_lock); |
| 758 | |
| 759 | /* |
| 760 | * Check to see if we resolved a queued list. If so we |
| 761 | * need to send on the frames and tidy up. |
| 762 | */ |
| 763 | spin_lock_bh(&mfc_unres_lock); |
| 764 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; |
| 765 | cp = &uc->next) { |
| 766 | if (uc->mfc_origin == c->mfc_origin && |
| 767 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
| 768 | *cp = uc->next; |
| 769 | if (atomic_dec_and_test(&cache_resolve_queue_len)) |
| 770 | del_timer(&ipmr_expire_timer); |
| 771 | break; |
| 772 | } |
| 773 | } |
| 774 | spin_unlock_bh(&mfc_unres_lock); |
| 775 | |
| 776 | if (uc) { |
| 777 | ipmr_cache_resolve(uc, c); |
| 778 | kmem_cache_free(mrt_cachep, uc); |
| 779 | } |
| 780 | return 0; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * Close the multicast socket, and clear the vif tables etc |
| 785 | */ |
| 786 | |
| 787 | static void mroute_clean_tables(struct sock *sk) |
| 788 | { |
| 789 | int i; |
| 790 | |
| 791 | /* |
| 792 | * Shut down all active vif entries |
| 793 | */ |
| 794 | for(i=0; i<maxvif; i++) { |
| 795 | if (!(vif_table[i].flags&VIFF_STATIC)) |
| 796 | vif_delete(i); |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * Wipe the cache |
| 801 | */ |
| 802 | for (i=0;i<MFC_LINES;i++) { |
| 803 | struct mfc_cache *c, **cp; |
| 804 | |
| 805 | cp = &mfc_cache_array[i]; |
| 806 | while ((c = *cp) != NULL) { |
| 807 | if (c->mfc_flags&MFC_STATIC) { |
| 808 | cp = &c->next; |
| 809 | continue; |
| 810 | } |
| 811 | write_lock_bh(&mrt_lock); |
| 812 | *cp = c->next; |
| 813 | write_unlock_bh(&mrt_lock); |
| 814 | |
| 815 | kmem_cache_free(mrt_cachep, c); |
| 816 | } |
| 817 | } |
| 818 | |
| 819 | if (atomic_read(&cache_resolve_queue_len) != 0) { |
| 820 | struct mfc_cache *c; |
| 821 | |
| 822 | spin_lock_bh(&mfc_unres_lock); |
| 823 | while (mfc_unres_queue != NULL) { |
| 824 | c = mfc_unres_queue; |
| 825 | mfc_unres_queue = c->next; |
| 826 | spin_unlock_bh(&mfc_unres_lock); |
| 827 | |
| 828 | ipmr_destroy_unres(c); |
| 829 | |
| 830 | spin_lock_bh(&mfc_unres_lock); |
| 831 | } |
| 832 | spin_unlock_bh(&mfc_unres_lock); |
| 833 | } |
| 834 | } |
| 835 | |
| 836 | static void mrtsock_destruct(struct sock *sk) |
| 837 | { |
| 838 | rtnl_lock(); |
| 839 | if (sk == mroute_socket) { |
| 840 | ipv4_devconf.mc_forwarding--; |
| 841 | |
| 842 | write_lock_bh(&mrt_lock); |
| 843 | mroute_socket=NULL; |
| 844 | write_unlock_bh(&mrt_lock); |
| 845 | |
| 846 | mroute_clean_tables(sk); |
| 847 | } |
| 848 | rtnl_unlock(); |
| 849 | } |
| 850 | |
| 851 | /* |
| 852 | * Socket options and virtual interface manipulation. The whole |
| 853 | * virtual interface system is a complete heap, but unfortunately |
| 854 | * that's how BSD mrouted happens to think. Maybe one day with a proper |
| 855 | * MOSPF/PIM router set up we can clean this up. |
| 856 | */ |
| 857 | |
| 858 | int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) |
| 859 | { |
| 860 | int ret; |
| 861 | struct vifctl vif; |
| 862 | struct mfcctl mfc; |
| 863 | |
| 864 | if(optname!=MRT_INIT) |
| 865 | { |
| 866 | if(sk!=mroute_socket && !capable(CAP_NET_ADMIN)) |
| 867 | return -EACCES; |
| 868 | } |
| 869 | |
| 870 | switch(optname) |
| 871 | { |
| 872 | case MRT_INIT: |
| 873 | if (sk->sk_type != SOCK_RAW || |
| 874 | inet_sk(sk)->num != IPPROTO_IGMP) |
| 875 | return -EOPNOTSUPP; |
| 876 | if(optlen!=sizeof(int)) |
| 877 | return -ENOPROTOOPT; |
| 878 | |
| 879 | rtnl_lock(); |
| 880 | if (mroute_socket) { |
| 881 | rtnl_unlock(); |
| 882 | return -EADDRINUSE; |
| 883 | } |
| 884 | |
| 885 | ret = ip_ra_control(sk, 1, mrtsock_destruct); |
| 886 | if (ret == 0) { |
| 887 | write_lock_bh(&mrt_lock); |
| 888 | mroute_socket=sk; |
| 889 | write_unlock_bh(&mrt_lock); |
| 890 | |
| 891 | ipv4_devconf.mc_forwarding++; |
| 892 | } |
| 893 | rtnl_unlock(); |
| 894 | return ret; |
| 895 | case MRT_DONE: |
| 896 | if (sk!=mroute_socket) |
| 897 | return -EACCES; |
| 898 | return ip_ra_control(sk, 0, NULL); |
| 899 | case MRT_ADD_VIF: |
| 900 | case MRT_DEL_VIF: |
| 901 | if(optlen!=sizeof(vif)) |
| 902 | return -EINVAL; |
| 903 | if (copy_from_user(&vif,optval,sizeof(vif))) |
| 904 | return -EFAULT; |
| 905 | if(vif.vifc_vifi >= MAXVIFS) |
| 906 | return -ENFILE; |
| 907 | rtnl_lock(); |
| 908 | if (optname==MRT_ADD_VIF) { |
| 909 | ret = vif_add(&vif, sk==mroute_socket); |
| 910 | } else { |
| 911 | ret = vif_delete(vif.vifc_vifi); |
| 912 | } |
| 913 | rtnl_unlock(); |
| 914 | return ret; |
| 915 | |
| 916 | /* |
| 917 | * Manipulate the forwarding caches. These live |
| 918 | * in a sort of kernel/user symbiosis. |
| 919 | */ |
| 920 | case MRT_ADD_MFC: |
| 921 | case MRT_DEL_MFC: |
| 922 | if(optlen!=sizeof(mfc)) |
| 923 | return -EINVAL; |
| 924 | if (copy_from_user(&mfc,optval, sizeof(mfc))) |
| 925 | return -EFAULT; |
| 926 | rtnl_lock(); |
| 927 | if (optname==MRT_DEL_MFC) |
| 928 | ret = ipmr_mfc_delete(&mfc); |
| 929 | else |
| 930 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); |
| 931 | rtnl_unlock(); |
| 932 | return ret; |
| 933 | /* |
| 934 | * Control PIM assert. |
| 935 | */ |
| 936 | case MRT_ASSERT: |
| 937 | { |
| 938 | int v; |
| 939 | if(get_user(v,(int __user *)optval)) |
| 940 | return -EFAULT; |
| 941 | mroute_do_assert=(v)?1:0; |
| 942 | return 0; |
| 943 | } |
| 944 | #ifdef CONFIG_IP_PIMSM |
| 945 | case MRT_PIM: |
| 946 | { |
| 947 | int v, ret; |
| 948 | if(get_user(v,(int __user *)optval)) |
| 949 | return -EFAULT; |
| 950 | v = (v)?1:0; |
| 951 | rtnl_lock(); |
| 952 | ret = 0; |
| 953 | if (v != mroute_do_pim) { |
| 954 | mroute_do_pim = v; |
| 955 | mroute_do_assert = v; |
| 956 | #ifdef CONFIG_IP_PIMSM_V2 |
| 957 | if (mroute_do_pim) |
| 958 | ret = inet_add_protocol(&pim_protocol, |
| 959 | IPPROTO_PIM); |
| 960 | else |
| 961 | ret = inet_del_protocol(&pim_protocol, |
| 962 | IPPROTO_PIM); |
| 963 | if (ret < 0) |
| 964 | ret = -EAGAIN; |
| 965 | #endif |
| 966 | } |
| 967 | rtnl_unlock(); |
| 968 | return ret; |
| 969 | } |
| 970 | #endif |
| 971 | /* |
| 972 | * Spurious command, or MRT_VERSION which you cannot |
| 973 | * set. |
| 974 | */ |
| 975 | default: |
| 976 | return -ENOPROTOOPT; |
| 977 | } |
| 978 | } |
| 979 | |
| 980 | /* |
| 981 | * Getsock opt support for the multicast routing system. |
| 982 | */ |
| 983 | |
| 984 | int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) |
| 985 | { |
| 986 | int olr; |
| 987 | int val; |
| 988 | |
| 989 | if(optname!=MRT_VERSION && |
| 990 | #ifdef CONFIG_IP_PIMSM |
| 991 | optname!=MRT_PIM && |
| 992 | #endif |
| 993 | optname!=MRT_ASSERT) |
| 994 | return -ENOPROTOOPT; |
| 995 | |
| 996 | if (get_user(olr, optlen)) |
| 997 | return -EFAULT; |
| 998 | |
| 999 | olr = min_t(unsigned int, olr, sizeof(int)); |
| 1000 | if (olr < 0) |
| 1001 | return -EINVAL; |
| 1002 | |
| 1003 | if(put_user(olr,optlen)) |
| 1004 | return -EFAULT; |
| 1005 | if(optname==MRT_VERSION) |
| 1006 | val=0x0305; |
| 1007 | #ifdef CONFIG_IP_PIMSM |
| 1008 | else if(optname==MRT_PIM) |
| 1009 | val=mroute_do_pim; |
| 1010 | #endif |
| 1011 | else |
| 1012 | val=mroute_do_assert; |
| 1013 | if(copy_to_user(optval,&val,olr)) |
| 1014 | return -EFAULT; |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | * The IP multicast ioctl support routines. |
| 1020 | */ |
| 1021 | |
| 1022 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
| 1023 | { |
| 1024 | struct sioc_sg_req sr; |
| 1025 | struct sioc_vif_req vr; |
| 1026 | struct vif_device *vif; |
| 1027 | struct mfc_cache *c; |
| 1028 | |
| 1029 | switch(cmd) |
| 1030 | { |
| 1031 | case SIOCGETVIFCNT: |
| 1032 | if (copy_from_user(&vr,arg,sizeof(vr))) |
| 1033 | return -EFAULT; |
| 1034 | if(vr.vifi>=maxvif) |
| 1035 | return -EINVAL; |
| 1036 | read_lock(&mrt_lock); |
| 1037 | vif=&vif_table[vr.vifi]; |
| 1038 | if(VIF_EXISTS(vr.vifi)) { |
| 1039 | vr.icount=vif->pkt_in; |
| 1040 | vr.ocount=vif->pkt_out; |
| 1041 | vr.ibytes=vif->bytes_in; |
| 1042 | vr.obytes=vif->bytes_out; |
| 1043 | read_unlock(&mrt_lock); |
| 1044 | |
| 1045 | if (copy_to_user(arg,&vr,sizeof(vr))) |
| 1046 | return -EFAULT; |
| 1047 | return 0; |
| 1048 | } |
| 1049 | read_unlock(&mrt_lock); |
| 1050 | return -EADDRNOTAVAIL; |
| 1051 | case SIOCGETSGCNT: |
| 1052 | if (copy_from_user(&sr,arg,sizeof(sr))) |
| 1053 | return -EFAULT; |
| 1054 | |
| 1055 | read_lock(&mrt_lock); |
| 1056 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); |
| 1057 | if (c) { |
| 1058 | sr.pktcnt = c->mfc_un.res.pkt; |
| 1059 | sr.bytecnt = c->mfc_un.res.bytes; |
| 1060 | sr.wrong_if = c->mfc_un.res.wrong_if; |
| 1061 | read_unlock(&mrt_lock); |
| 1062 | |
| 1063 | if (copy_to_user(arg,&sr,sizeof(sr))) |
| 1064 | return -EFAULT; |
| 1065 | return 0; |
| 1066 | } |
| 1067 | read_unlock(&mrt_lock); |
| 1068 | return -EADDRNOTAVAIL; |
| 1069 | default: |
| 1070 | return -ENOIOCTLCMD; |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | |
| 1075 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
| 1076 | { |
| 1077 | struct vif_device *v; |
| 1078 | int ct; |
| 1079 | if (event != NETDEV_UNREGISTER) |
| 1080 | return NOTIFY_DONE; |
| 1081 | v=&vif_table[0]; |
| 1082 | for(ct=0;ct<maxvif;ct++,v++) { |
| 1083 | if (v->dev==ptr) |
| 1084 | vif_delete(ct); |
| 1085 | } |
| 1086 | return NOTIFY_DONE; |
| 1087 | } |
| 1088 | |
| 1089 | |
| 1090 | static struct notifier_block ip_mr_notifier={ |
| 1091 | .notifier_call = ipmr_device_event, |
| 1092 | }; |
| 1093 | |
| 1094 | /* |
| 1095 | * Encapsulate a packet by attaching a valid IPIP header to it. |
| 1096 | * This avoids tunnel drivers and other mess and gives us the speed so |
| 1097 | * important for multicast video. |
| 1098 | */ |
| 1099 | |
| 1100 | static void ip_encap(struct sk_buff *skb, u32 saddr, u32 daddr) |
| 1101 | { |
| 1102 | struct iphdr *iph = (struct iphdr *)skb_push(skb,sizeof(struct iphdr)); |
| 1103 | |
| 1104 | iph->version = 4; |
| 1105 | iph->tos = skb->nh.iph->tos; |
| 1106 | iph->ttl = skb->nh.iph->ttl; |
| 1107 | iph->frag_off = 0; |
| 1108 | iph->daddr = daddr; |
| 1109 | iph->saddr = saddr; |
| 1110 | iph->protocol = IPPROTO_IPIP; |
| 1111 | iph->ihl = 5; |
| 1112 | iph->tot_len = htons(skb->len); |
| 1113 | ip_select_ident(iph, skb->dst, NULL); |
| 1114 | ip_send_check(iph); |
| 1115 | |
| 1116 | skb->h.ipiph = skb->nh.iph; |
| 1117 | skb->nh.iph = iph; |
| 1118 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
| 1119 | nf_reset(skb); |
| 1120 | } |
| 1121 | |
| 1122 | static inline int ipmr_forward_finish(struct sk_buff *skb) |
| 1123 | { |
| 1124 | struct ip_options * opt = &(IPCB(skb)->opt); |
| 1125 | |
| 1126 | IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); |
| 1127 | |
| 1128 | if (unlikely(opt->optlen)) |
| 1129 | ip_forward_options(skb); |
| 1130 | |
| 1131 | return dst_output(skb); |
| 1132 | } |
| 1133 | |
| 1134 | /* |
| 1135 | * Processing handlers for ipmr_forward |
| 1136 | */ |
| 1137 | |
| 1138 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) |
| 1139 | { |
| 1140 | struct iphdr *iph = skb->nh.iph; |
| 1141 | struct vif_device *vif = &vif_table[vifi]; |
| 1142 | struct net_device *dev; |
| 1143 | struct rtable *rt; |
| 1144 | int encap = 0; |
| 1145 | |
| 1146 | if (vif->dev == NULL) |
| 1147 | goto out_free; |
| 1148 | |
| 1149 | #ifdef CONFIG_IP_PIMSM |
| 1150 | if (vif->flags & VIFF_REGISTER) { |
| 1151 | vif->pkt_out++; |
| 1152 | vif->bytes_out+=skb->len; |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1153 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_bytes += skb->len; |
| 1154 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
| 1156 | kfree_skb(skb); |
| 1157 | return; |
| 1158 | } |
| 1159 | #endif |
| 1160 | |
| 1161 | if (vif->flags&VIFF_TUNNEL) { |
| 1162 | struct flowi fl = { .oif = vif->link, |
| 1163 | .nl_u = { .ip4_u = |
| 1164 | { .daddr = vif->remote, |
| 1165 | .saddr = vif->local, |
| 1166 | .tos = RT_TOS(iph->tos) } }, |
| 1167 | .proto = IPPROTO_IPIP }; |
| 1168 | if (ip_route_output_key(&rt, &fl)) |
| 1169 | goto out_free; |
| 1170 | encap = sizeof(struct iphdr); |
| 1171 | } else { |
| 1172 | struct flowi fl = { .oif = vif->link, |
| 1173 | .nl_u = { .ip4_u = |
| 1174 | { .daddr = iph->daddr, |
| 1175 | .tos = RT_TOS(iph->tos) } }, |
| 1176 | .proto = IPPROTO_IPIP }; |
| 1177 | if (ip_route_output_key(&rt, &fl)) |
| 1178 | goto out_free; |
| 1179 | } |
| 1180 | |
| 1181 | dev = rt->u.dst.dev; |
| 1182 | |
| 1183 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { |
| 1184 | /* Do not fragment multicasts. Alas, IPv4 does not |
| 1185 | allow to send ICMP, so that packets will disappear |
| 1186 | to blackhole. |
| 1187 | */ |
| 1188 | |
| 1189 | IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); |
| 1190 | ip_rt_put(rt); |
| 1191 | goto out_free; |
| 1192 | } |
| 1193 | |
| 1194 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; |
| 1195 | |
| 1196 | if (skb_cow(skb, encap)) { |
| 1197 | ip_rt_put(rt); |
| 1198 | goto out_free; |
| 1199 | } |
| 1200 | |
| 1201 | vif->pkt_out++; |
| 1202 | vif->bytes_out+=skb->len; |
| 1203 | |
| 1204 | dst_release(skb->dst); |
| 1205 | skb->dst = &rt->u.dst; |
| 1206 | iph = skb->nh.iph; |
| 1207 | ip_decrease_ttl(iph); |
| 1208 | |
| 1209 | /* FIXME: forward and output firewalls used to be called here. |
| 1210 | * What do we do with netfilter? -- RR */ |
| 1211 | if (vif->flags & VIFF_TUNNEL) { |
| 1212 | ip_encap(skb, vif->local, vif->remote); |
| 1213 | /* FIXME: extra output firewall step used to be here. --RR */ |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1214 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_packets++; |
| 1215 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_bytes+=skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | } |
| 1217 | |
| 1218 | IPCB(skb)->flags |= IPSKB_FORWARDED; |
| 1219 | |
| 1220 | /* |
| 1221 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
| 1222 | * not only before forwarding, but after forwarding on all output |
| 1223 | * interfaces. It is clear, if mrouter runs a multicasting |
| 1224 | * program, it should receive packets not depending to what interface |
| 1225 | * program is joined. |
| 1226 | * If we will not make it, the program will have to join on all |
| 1227 | * interfaces. On the other hand, multihoming host (or router, but |
| 1228 | * not mrouter) cannot join to more than one interface - it will |
| 1229 | * result in receiving multiple packets. |
| 1230 | */ |
| 1231 | NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, |
| 1232 | ipmr_forward_finish); |
| 1233 | return; |
| 1234 | |
| 1235 | out_free: |
| 1236 | kfree_skb(skb); |
| 1237 | return; |
| 1238 | } |
| 1239 | |
| 1240 | static int ipmr_find_vif(struct net_device *dev) |
| 1241 | { |
| 1242 | int ct; |
| 1243 | for (ct=maxvif-1; ct>=0; ct--) { |
| 1244 | if (vif_table[ct].dev == dev) |
| 1245 | break; |
| 1246 | } |
| 1247 | return ct; |
| 1248 | } |
| 1249 | |
| 1250 | /* "local" means that we should preserve one skb (for local delivery) */ |
| 1251 | |
| 1252 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) |
| 1253 | { |
| 1254 | int psend = -1; |
| 1255 | int vif, ct; |
| 1256 | |
| 1257 | vif = cache->mfc_parent; |
| 1258 | cache->mfc_un.res.pkt++; |
| 1259 | cache->mfc_un.res.bytes += skb->len; |
| 1260 | |
| 1261 | /* |
| 1262 | * Wrong interface: drop packet and (maybe) send PIM assert. |
| 1263 | */ |
| 1264 | if (vif_table[vif].dev != skb->dev) { |
| 1265 | int true_vifi; |
| 1266 | |
| 1267 | if (((struct rtable*)skb->dst)->fl.iif == 0) { |
| 1268 | /* It is our own packet, looped back. |
| 1269 | Very complicated situation... |
| 1270 | |
| 1271 | The best workaround until routing daemons will be |
| 1272 | fixed is not to redistribute packet, if it was |
| 1273 | send through wrong interface. It means, that |
| 1274 | multicast applications WILL NOT work for |
| 1275 | (S,G), which have default multicast route pointing |
| 1276 | to wrong oif. In any case, it is not a good |
| 1277 | idea to use multicasting applications on router. |
| 1278 | */ |
| 1279 | goto dont_forward; |
| 1280 | } |
| 1281 | |
| 1282 | cache->mfc_un.res.wrong_if++; |
| 1283 | true_vifi = ipmr_find_vif(skb->dev); |
| 1284 | |
| 1285 | if (true_vifi >= 0 && mroute_do_assert && |
| 1286 | /* pimsm uses asserts, when switching from RPT to SPT, |
| 1287 | so that we cannot check that packet arrived on an oif. |
| 1288 | It is bad, but otherwise we would need to move pretty |
| 1289 | large chunk of pimd to kernel. Ough... --ANK |
| 1290 | */ |
| 1291 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && |
| 1292 | time_after(jiffies, |
| 1293 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
| 1294 | cache->mfc_un.res.last_assert = jiffies; |
| 1295 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); |
| 1296 | } |
| 1297 | goto dont_forward; |
| 1298 | } |
| 1299 | |
| 1300 | vif_table[vif].pkt_in++; |
| 1301 | vif_table[vif].bytes_in+=skb->len; |
| 1302 | |
| 1303 | /* |
| 1304 | * Forward the frame |
| 1305 | */ |
| 1306 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { |
| 1307 | if (skb->nh.iph->ttl > cache->mfc_un.res.ttls[ct]) { |
| 1308 | if (psend != -1) { |
| 1309 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1310 | if (skb2) |
| 1311 | ipmr_queue_xmit(skb2, cache, psend); |
| 1312 | } |
| 1313 | psend=ct; |
| 1314 | } |
| 1315 | } |
| 1316 | if (psend != -1) { |
| 1317 | if (local) { |
| 1318 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1319 | if (skb2) |
| 1320 | ipmr_queue_xmit(skb2, cache, psend); |
| 1321 | } else { |
| 1322 | ipmr_queue_xmit(skb, cache, psend); |
| 1323 | return 0; |
| 1324 | } |
| 1325 | } |
| 1326 | |
| 1327 | dont_forward: |
| 1328 | if (!local) |
| 1329 | kfree_skb(skb); |
| 1330 | return 0; |
| 1331 | } |
| 1332 | |
| 1333 | |
| 1334 | /* |
| 1335 | * Multicast packets for forwarding arrive here |
| 1336 | */ |
| 1337 | |
| 1338 | int ip_mr_input(struct sk_buff *skb) |
| 1339 | { |
| 1340 | struct mfc_cache *cache; |
| 1341 | int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; |
| 1342 | |
| 1343 | /* Packet is looped back after forward, it should not be |
| 1344 | forwarded second time, but still can be delivered locally. |
| 1345 | */ |
| 1346 | if (IPCB(skb)->flags&IPSKB_FORWARDED) |
| 1347 | goto dont_forward; |
| 1348 | |
| 1349 | if (!local) { |
| 1350 | if (IPCB(skb)->opt.router_alert) { |
| 1351 | if (ip_call_ra_chain(skb)) |
| 1352 | return 0; |
| 1353 | } else if (skb->nh.iph->protocol == IPPROTO_IGMP){ |
| 1354 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
| 1355 | Cisco IOS <= 11.2(8)) do not put router alert |
| 1356 | option to IGMP packets destined to routable |
| 1357 | groups. It is very bad, because it means |
| 1358 | that we can forward NO IGMP messages. |
| 1359 | */ |
| 1360 | read_lock(&mrt_lock); |
| 1361 | if (mroute_socket) { |
Patrick McHardy | 2715bcf | 2005-06-21 14:06:24 -0700 | [diff] [blame] | 1362 | nf_reset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | raw_rcv(mroute_socket, skb); |
| 1364 | read_unlock(&mrt_lock); |
| 1365 | return 0; |
| 1366 | } |
| 1367 | read_unlock(&mrt_lock); |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | read_lock(&mrt_lock); |
| 1372 | cache = ipmr_cache_find(skb->nh.iph->saddr, skb->nh.iph->daddr); |
| 1373 | |
| 1374 | /* |
| 1375 | * No usable cache entry |
| 1376 | */ |
| 1377 | if (cache==NULL) { |
| 1378 | int vif; |
| 1379 | |
| 1380 | if (local) { |
| 1381 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1382 | ip_local_deliver(skb); |
| 1383 | if (skb2 == NULL) { |
| 1384 | read_unlock(&mrt_lock); |
| 1385 | return -ENOBUFS; |
| 1386 | } |
| 1387 | skb = skb2; |
| 1388 | } |
| 1389 | |
| 1390 | vif = ipmr_find_vif(skb->dev); |
| 1391 | if (vif >= 0) { |
| 1392 | int err = ipmr_cache_unresolved(vif, skb); |
| 1393 | read_unlock(&mrt_lock); |
| 1394 | |
| 1395 | return err; |
| 1396 | } |
| 1397 | read_unlock(&mrt_lock); |
| 1398 | kfree_skb(skb); |
| 1399 | return -ENODEV; |
| 1400 | } |
| 1401 | |
| 1402 | ip_mr_forward(skb, cache, local); |
| 1403 | |
| 1404 | read_unlock(&mrt_lock); |
| 1405 | |
| 1406 | if (local) |
| 1407 | return ip_local_deliver(skb); |
| 1408 | |
| 1409 | return 0; |
| 1410 | |
| 1411 | dont_forward: |
| 1412 | if (local) |
| 1413 | return ip_local_deliver(skb); |
| 1414 | kfree_skb(skb); |
| 1415 | return 0; |
| 1416 | } |
| 1417 | |
| 1418 | #ifdef CONFIG_IP_PIMSM_V1 |
| 1419 | /* |
| 1420 | * Handle IGMP messages of PIMv1 |
| 1421 | */ |
| 1422 | |
| 1423 | int pim_rcv_v1(struct sk_buff * skb) |
| 1424 | { |
| 1425 | struct igmphdr *pim; |
| 1426 | struct iphdr *encap; |
| 1427 | struct net_device *reg_dev = NULL; |
| 1428 | |
| 1429 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
| 1430 | goto drop; |
| 1431 | |
| 1432 | pim = (struct igmphdr*)skb->h.raw; |
| 1433 | |
| 1434 | if (!mroute_do_pim || |
| 1435 | skb->len < sizeof(*pim) + sizeof(*encap) || |
| 1436 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
| 1437 | goto drop; |
| 1438 | |
| 1439 | encap = (struct iphdr*)(skb->h.raw + sizeof(struct igmphdr)); |
| 1440 | /* |
| 1441 | Check that: |
| 1442 | a. packet is really destinted to a multicast group |
| 1443 | b. packet is not a NULL-REGISTER |
| 1444 | c. packet is not truncated |
| 1445 | */ |
| 1446 | if (!MULTICAST(encap->daddr) || |
| 1447 | encap->tot_len == 0 || |
| 1448 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
| 1449 | goto drop; |
| 1450 | |
| 1451 | read_lock(&mrt_lock); |
| 1452 | if (reg_vif_num >= 0) |
| 1453 | reg_dev = vif_table[reg_vif_num].dev; |
| 1454 | if (reg_dev) |
| 1455 | dev_hold(reg_dev); |
| 1456 | read_unlock(&mrt_lock); |
| 1457 | |
| 1458 | if (reg_dev == NULL) |
| 1459 | goto drop; |
| 1460 | |
| 1461 | skb->mac.raw = skb->nh.raw; |
| 1462 | skb_pull(skb, (u8*)encap - skb->data); |
| 1463 | skb->nh.iph = (struct iphdr *)skb->data; |
| 1464 | skb->dev = reg_dev; |
| 1465 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); |
| 1466 | skb->protocol = htons(ETH_P_IP); |
| 1467 | skb->ip_summed = 0; |
| 1468 | skb->pkt_type = PACKET_HOST; |
| 1469 | dst_release(skb->dst); |
| 1470 | skb->dst = NULL; |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1471 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
| 1472 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | nf_reset(skb); |
| 1474 | netif_rx(skb); |
| 1475 | dev_put(reg_dev); |
| 1476 | return 0; |
| 1477 | drop: |
| 1478 | kfree_skb(skb); |
| 1479 | return 0; |
| 1480 | } |
| 1481 | #endif |
| 1482 | |
| 1483 | #ifdef CONFIG_IP_PIMSM_V2 |
| 1484 | static int pim_rcv(struct sk_buff * skb) |
| 1485 | { |
| 1486 | struct pimreghdr *pim; |
| 1487 | struct iphdr *encap; |
| 1488 | struct net_device *reg_dev = NULL; |
| 1489 | |
| 1490 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
| 1491 | goto drop; |
| 1492 | |
| 1493 | pim = (struct pimreghdr*)skb->h.raw; |
| 1494 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
| 1495 | (pim->flags&PIM_NULL_REGISTER) || |
| 1496 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
| 1497 | (u16)csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
| 1498 | goto drop; |
| 1499 | |
| 1500 | /* check if the inner packet is destined to mcast group */ |
| 1501 | encap = (struct iphdr*)(skb->h.raw + sizeof(struct pimreghdr)); |
| 1502 | if (!MULTICAST(encap->daddr) || |
| 1503 | encap->tot_len == 0 || |
| 1504 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
| 1505 | goto drop; |
| 1506 | |
| 1507 | read_lock(&mrt_lock); |
| 1508 | if (reg_vif_num >= 0) |
| 1509 | reg_dev = vif_table[reg_vif_num].dev; |
| 1510 | if (reg_dev) |
| 1511 | dev_hold(reg_dev); |
| 1512 | read_unlock(&mrt_lock); |
| 1513 | |
| 1514 | if (reg_dev == NULL) |
| 1515 | goto drop; |
| 1516 | |
| 1517 | skb->mac.raw = skb->nh.raw; |
| 1518 | skb_pull(skb, (u8*)encap - skb->data); |
| 1519 | skb->nh.iph = (struct iphdr *)skb->data; |
| 1520 | skb->dev = reg_dev; |
| 1521 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); |
| 1522 | skb->protocol = htons(ETH_P_IP); |
| 1523 | skb->ip_summed = 0; |
| 1524 | skb->pkt_type = PACKET_HOST; |
| 1525 | dst_release(skb->dst); |
Patrick McHardy | 2941a48 | 2006-01-08 22:05:26 -0800 | [diff] [blame] | 1526 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
| 1527 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | skb->dst = NULL; |
| 1529 | nf_reset(skb); |
| 1530 | netif_rx(skb); |
| 1531 | dev_put(reg_dev); |
| 1532 | return 0; |
| 1533 | drop: |
| 1534 | kfree_skb(skb); |
| 1535 | return 0; |
| 1536 | } |
| 1537 | #endif |
| 1538 | |
| 1539 | static int |
| 1540 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) |
| 1541 | { |
| 1542 | int ct; |
| 1543 | struct rtnexthop *nhp; |
| 1544 | struct net_device *dev = vif_table[c->mfc_parent].dev; |
| 1545 | u8 *b = skb->tail; |
| 1546 | struct rtattr *mp_head; |
| 1547 | |
| 1548 | if (dev) |
| 1549 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); |
| 1550 | |
| 1551 | mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); |
| 1552 | |
| 1553 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| 1554 | if (c->mfc_un.res.ttls[ct] < 255) { |
| 1555 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
| 1556 | goto rtattr_failure; |
| 1557 | nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
| 1558 | nhp->rtnh_flags = 0; |
| 1559 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
| 1560 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; |
| 1561 | nhp->rtnh_len = sizeof(*nhp); |
| 1562 | } |
| 1563 | } |
| 1564 | mp_head->rta_type = RTA_MULTIPATH; |
| 1565 | mp_head->rta_len = skb->tail - (u8*)mp_head; |
| 1566 | rtm->rtm_type = RTN_MULTICAST; |
| 1567 | return 1; |
| 1568 | |
| 1569 | rtattr_failure: |
| 1570 | skb_trim(skb, b - skb->data); |
| 1571 | return -EMSGSIZE; |
| 1572 | } |
| 1573 | |
| 1574 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) |
| 1575 | { |
| 1576 | int err; |
| 1577 | struct mfc_cache *cache; |
| 1578 | struct rtable *rt = (struct rtable*)skb->dst; |
| 1579 | |
| 1580 | read_lock(&mrt_lock); |
| 1581 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); |
| 1582 | |
| 1583 | if (cache==NULL) { |
| 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 = ipmr_find_vif(dev)) < 0) { |
| 1594 | read_unlock(&mrt_lock); |
| 1595 | return -ENODEV; |
| 1596 | } |
| 1597 | skb->nh.raw = skb_push(skb, sizeof(struct iphdr)); |
| 1598 | skb->nh.iph->ihl = sizeof(struct iphdr)>>2; |
| 1599 | skb->nh.iph->saddr = rt->rt_src; |
| 1600 | skb->nh.iph->daddr = rt->rt_dst; |
| 1601 | skb->nh.iph->version = 0; |
| 1602 | err = ipmr_cache_unresolved(vif, skb); |
| 1603 | read_unlock(&mrt_lock); |
| 1604 | return err; |
| 1605 | } |
| 1606 | |
| 1607 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) |
| 1608 | cache->mfc_flags |= MFC_NOTIFY; |
| 1609 | err = ipmr_fill_mroute(skb, cache, rtm); |
| 1610 | read_unlock(&mrt_lock); |
| 1611 | return err; |
| 1612 | } |
| 1613 | |
| 1614 | #ifdef CONFIG_PROC_FS |
| 1615 | /* |
| 1616 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif |
| 1617 | */ |
| 1618 | struct ipmr_vif_iter { |
| 1619 | int ct; |
| 1620 | }; |
| 1621 | |
| 1622 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, |
| 1623 | loff_t pos) |
| 1624 | { |
| 1625 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { |
| 1626 | if(!VIF_EXISTS(iter->ct)) |
| 1627 | continue; |
| 1628 | if (pos-- == 0) |
| 1629 | return &vif_table[iter->ct]; |
| 1630 | } |
| 1631 | return NULL; |
| 1632 | } |
| 1633 | |
| 1634 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) |
| 1635 | { |
| 1636 | read_lock(&mrt_lock); |
| 1637 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) |
| 1638 | : SEQ_START_TOKEN; |
| 1639 | } |
| 1640 | |
| 1641 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1642 | { |
| 1643 | struct ipmr_vif_iter *iter = seq->private; |
| 1644 | |
| 1645 | ++*pos; |
| 1646 | if (v == SEQ_START_TOKEN) |
| 1647 | return ipmr_vif_seq_idx(iter, 0); |
| 1648 | |
| 1649 | while (++iter->ct < maxvif) { |
| 1650 | if(!VIF_EXISTS(iter->ct)) |
| 1651 | continue; |
| 1652 | return &vif_table[iter->ct]; |
| 1653 | } |
| 1654 | return NULL; |
| 1655 | } |
| 1656 | |
| 1657 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) |
| 1658 | { |
| 1659 | read_unlock(&mrt_lock); |
| 1660 | } |
| 1661 | |
| 1662 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) |
| 1663 | { |
| 1664 | if (v == SEQ_START_TOKEN) { |
| 1665 | seq_puts(seq, |
| 1666 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
| 1667 | } else { |
| 1668 | const struct vif_device *vif = v; |
| 1669 | const char *name = vif->dev ? vif->dev->name : "none"; |
| 1670 | |
| 1671 | seq_printf(seq, |
| 1672 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
| 1673 | vif - vif_table, |
| 1674 | name, vif->bytes_in, vif->pkt_in, |
| 1675 | vif->bytes_out, vif->pkt_out, |
| 1676 | vif->flags, vif->local, vif->remote); |
| 1677 | } |
| 1678 | return 0; |
| 1679 | } |
| 1680 | |
| 1681 | static struct seq_operations ipmr_vif_seq_ops = { |
| 1682 | .start = ipmr_vif_seq_start, |
| 1683 | .next = ipmr_vif_seq_next, |
| 1684 | .stop = ipmr_vif_seq_stop, |
| 1685 | .show = ipmr_vif_seq_show, |
| 1686 | }; |
| 1687 | |
| 1688 | static int ipmr_vif_open(struct inode *inode, struct file *file) |
| 1689 | { |
| 1690 | struct seq_file *seq; |
| 1691 | int rc = -ENOMEM; |
| 1692 | struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1693 | |
| 1694 | if (!s) |
| 1695 | goto out; |
| 1696 | |
| 1697 | rc = seq_open(file, &ipmr_vif_seq_ops); |
| 1698 | if (rc) |
| 1699 | goto out_kfree; |
| 1700 | |
| 1701 | s->ct = 0; |
| 1702 | seq = file->private_data; |
| 1703 | seq->private = s; |
| 1704 | out: |
| 1705 | return rc; |
| 1706 | out_kfree: |
| 1707 | kfree(s); |
| 1708 | goto out; |
| 1709 | |
| 1710 | } |
| 1711 | |
| 1712 | static struct file_operations ipmr_vif_fops = { |
| 1713 | .owner = THIS_MODULE, |
| 1714 | .open = ipmr_vif_open, |
| 1715 | .read = seq_read, |
| 1716 | .llseek = seq_lseek, |
| 1717 | .release = seq_release_private, |
| 1718 | }; |
| 1719 | |
| 1720 | struct ipmr_mfc_iter { |
| 1721 | struct mfc_cache **cache; |
| 1722 | int ct; |
| 1723 | }; |
| 1724 | |
| 1725 | |
| 1726 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) |
| 1727 | { |
| 1728 | struct mfc_cache *mfc; |
| 1729 | |
| 1730 | it->cache = mfc_cache_array; |
| 1731 | read_lock(&mrt_lock); |
| 1732 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
| 1733 | for(mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) |
| 1734 | if (pos-- == 0) |
| 1735 | return mfc; |
| 1736 | read_unlock(&mrt_lock); |
| 1737 | |
| 1738 | it->cache = &mfc_unres_queue; |
| 1739 | spin_lock_bh(&mfc_unres_lock); |
| 1740 | for(mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
| 1741 | if (pos-- == 0) |
| 1742 | return mfc; |
| 1743 | spin_unlock_bh(&mfc_unres_lock); |
| 1744 | |
| 1745 | it->cache = NULL; |
| 1746 | return NULL; |
| 1747 | } |
| 1748 | |
| 1749 | |
| 1750 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
| 1751 | { |
| 1752 | struct ipmr_mfc_iter *it = seq->private; |
| 1753 | it->cache = NULL; |
| 1754 | it->ct = 0; |
| 1755 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
| 1756 | : SEQ_START_TOKEN; |
| 1757 | } |
| 1758 | |
| 1759 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1760 | { |
| 1761 | struct mfc_cache *mfc = v; |
| 1762 | struct ipmr_mfc_iter *it = seq->private; |
| 1763 | |
| 1764 | ++*pos; |
| 1765 | |
| 1766 | if (v == SEQ_START_TOKEN) |
| 1767 | return ipmr_mfc_seq_idx(seq->private, 0); |
| 1768 | |
| 1769 | if (mfc->next) |
| 1770 | return mfc->next; |
| 1771 | |
| 1772 | if (it->cache == &mfc_unres_queue) |
| 1773 | goto end_of_list; |
| 1774 | |
| 1775 | BUG_ON(it->cache != mfc_cache_array); |
| 1776 | |
| 1777 | while (++it->ct < MFC_LINES) { |
| 1778 | mfc = mfc_cache_array[it->ct]; |
| 1779 | if (mfc) |
| 1780 | return mfc; |
| 1781 | } |
| 1782 | |
| 1783 | /* exhausted cache_array, show unresolved */ |
| 1784 | read_unlock(&mrt_lock); |
| 1785 | it->cache = &mfc_unres_queue; |
| 1786 | it->ct = 0; |
| 1787 | |
| 1788 | spin_lock_bh(&mfc_unres_lock); |
| 1789 | mfc = mfc_unres_queue; |
| 1790 | if (mfc) |
| 1791 | return mfc; |
| 1792 | |
| 1793 | end_of_list: |
| 1794 | spin_unlock_bh(&mfc_unres_lock); |
| 1795 | it->cache = NULL; |
| 1796 | |
| 1797 | return NULL; |
| 1798 | } |
| 1799 | |
| 1800 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) |
| 1801 | { |
| 1802 | struct ipmr_mfc_iter *it = seq->private; |
| 1803 | |
| 1804 | if (it->cache == &mfc_unres_queue) |
| 1805 | spin_unlock_bh(&mfc_unres_lock); |
| 1806 | else if (it->cache == mfc_cache_array) |
| 1807 | read_unlock(&mrt_lock); |
| 1808 | } |
| 1809 | |
| 1810 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) |
| 1811 | { |
| 1812 | int n; |
| 1813 | |
| 1814 | if (v == SEQ_START_TOKEN) { |
| 1815 | seq_puts(seq, |
| 1816 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
| 1817 | } else { |
| 1818 | const struct mfc_cache *mfc = v; |
| 1819 | const struct ipmr_mfc_iter *it = seq->private; |
| 1820 | |
| 1821 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", |
| 1822 | (unsigned long) mfc->mfc_mcastgrp, |
| 1823 | (unsigned long) mfc->mfc_origin, |
| 1824 | mfc->mfc_parent, |
| 1825 | mfc->mfc_un.res.pkt, |
| 1826 | mfc->mfc_un.res.bytes, |
| 1827 | mfc->mfc_un.res.wrong_if); |
| 1828 | |
| 1829 | if (it->cache != &mfc_unres_queue) { |
| 1830 | for(n = mfc->mfc_un.res.minvif; |
| 1831 | n < mfc->mfc_un.res.maxvif; n++ ) { |
| 1832 | if(VIF_EXISTS(n) |
| 1833 | && mfc->mfc_un.res.ttls[n] < 255) |
| 1834 | seq_printf(seq, |
| 1835 | " %2d:%-3d", |
| 1836 | n, mfc->mfc_un.res.ttls[n]); |
| 1837 | } |
| 1838 | } |
| 1839 | seq_putc(seq, '\n'); |
| 1840 | } |
| 1841 | return 0; |
| 1842 | } |
| 1843 | |
| 1844 | static struct seq_operations ipmr_mfc_seq_ops = { |
| 1845 | .start = ipmr_mfc_seq_start, |
| 1846 | .next = ipmr_mfc_seq_next, |
| 1847 | .stop = ipmr_mfc_seq_stop, |
| 1848 | .show = ipmr_mfc_seq_show, |
| 1849 | }; |
| 1850 | |
| 1851 | static int ipmr_mfc_open(struct inode *inode, struct file *file) |
| 1852 | { |
| 1853 | struct seq_file *seq; |
| 1854 | int rc = -ENOMEM; |
| 1855 | struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 1856 | |
| 1857 | if (!s) |
| 1858 | goto out; |
| 1859 | |
| 1860 | rc = seq_open(file, &ipmr_mfc_seq_ops); |
| 1861 | if (rc) |
| 1862 | goto out_kfree; |
| 1863 | |
| 1864 | seq = file->private_data; |
| 1865 | seq->private = s; |
| 1866 | out: |
| 1867 | return rc; |
| 1868 | out_kfree: |
| 1869 | kfree(s); |
| 1870 | goto out; |
| 1871 | |
| 1872 | } |
| 1873 | |
| 1874 | static struct file_operations ipmr_mfc_fops = { |
| 1875 | .owner = THIS_MODULE, |
| 1876 | .open = ipmr_mfc_open, |
| 1877 | .read = seq_read, |
| 1878 | .llseek = seq_lseek, |
| 1879 | .release = seq_release_private, |
| 1880 | }; |
| 1881 | #endif |
| 1882 | |
| 1883 | #ifdef CONFIG_IP_PIMSM_V2 |
| 1884 | static struct net_protocol pim_protocol = { |
| 1885 | .handler = pim_rcv, |
| 1886 | }; |
| 1887 | #endif |
| 1888 | |
| 1889 | |
| 1890 | /* |
| 1891 | * Setup for IP multicast routing |
| 1892 | */ |
| 1893 | |
| 1894 | void __init ip_mr_init(void) |
| 1895 | { |
| 1896 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
| 1897 | sizeof(struct mfc_cache), |
| 1898 | 0, SLAB_HWCACHE_ALIGN, |
| 1899 | NULL, NULL); |
| 1900 | if (!mrt_cachep) |
| 1901 | panic("cannot allocate ip_mrt_cache"); |
| 1902 | |
| 1903 | init_timer(&ipmr_expire_timer); |
| 1904 | ipmr_expire_timer.function=ipmr_expire_process; |
| 1905 | register_netdevice_notifier(&ip_mr_notifier); |
| 1906 | #ifdef CONFIG_PROC_FS |
| 1907 | proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops); |
| 1908 | proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops); |
| 1909 | #endif |
| 1910 | } |