Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
113aa838 | 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
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 | * | |
1da177e4 LT |
12 | * Fixes: |
13 | * Michael Chastain : Incorrect size of copying. | |
14 | * Alan Cox : Added the cache manager code | |
15 | * Alan Cox : Fixed the clone/copy bug and device race. | |
16 | * Mike McLagan : Routing by source | |
17 | * Malcolm Beattie : Buffer handling fixes. | |
18 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
19 | * SVR Anand : Fixed several multicast bugs and problems. | |
20 | * Alexey Kuznetsov : Status, optimisations and more. | |
21 | * Brad Parker : Better behaviour on mrouted upcall | |
22 | * overflow. | |
23 | * Carlos Picoto : PIMv1 Support | |
24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
25 | * Relax this requrement to work with older peers. | |
26 | * | |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <asm/system.h> |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/timer.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/fcntl.h> | |
38 | #include <linux/stat.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/inet.h> | |
42 | #include <linux/netdevice.h> | |
43 | #include <linux/inetdevice.h> | |
44 | #include <linux/igmp.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/mroute.h> | |
48 | #include <linux/init.h> | |
46f25dff | 49 | #include <linux/if_ether.h> |
457c4cbc | 50 | #include <net/net_namespace.h> |
1da177e4 LT |
51 | #include <net/ip.h> |
52 | #include <net/protocol.h> | |
53 | #include <linux/skbuff.h> | |
14c85021 | 54 | #include <net/route.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/icmp.h> | |
57 | #include <net/udp.h> | |
58 | #include <net/raw.h> | |
59 | #include <linux/notifier.h> | |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/netfilter_ipv4.h> | |
62 | #include <net/ipip.h> | |
63 | #include <net/checksum.h> | |
dc5fc579 | 64 | #include <net/netlink.h> |
1da177e4 LT |
65 | |
66 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
67 | #define CONFIG_IP_PIMSM 1 | |
68 | #endif | |
69 | ||
1da177e4 LT |
70 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
71 | Note that the changes are semaphored via rtnl_lock. | |
72 | */ | |
73 | ||
74 | static DEFINE_RWLOCK(mrt_lock); | |
75 | ||
76 | /* | |
77 | * Multicast router control variables | |
78 | */ | |
79 | ||
cf958ae3 | 80 | #define VIF_EXISTS(_net, _idx) ((_net)->ipv4.vif_table[_idx].dev != NULL) |
1da177e4 | 81 | |
1da177e4 | 82 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
1da177e4 LT |
83 | |
84 | /* Special spinlock for queue of unresolved entries */ | |
85 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
86 | ||
87 | /* We return to original Alan's scheme. Hash table of resolved | |
88 | entries is changed only in process context and protected | |
89 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
90 | with strong spinlock mfc_unres_lock. | |
91 | ||
92 | In this case data path is free of exclusive locks at all. | |
93 | */ | |
94 | ||
e18b890b | 95 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
96 | |
97 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
98 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
99 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
100 | ||
101 | #ifdef CONFIG_IP_PIMSM_V2 | |
102 | static struct net_protocol pim_protocol; | |
103 | #endif | |
104 | ||
105 | static struct timer_list ipmr_expire_timer; | |
106 | ||
107 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
108 | ||
d607032d WC |
109 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
110 | { | |
111 | dev_close(dev); | |
112 | ||
113 | dev = __dev_get_by_name(&init_net, "tunl0"); | |
114 | if (dev) { | |
5bc3eb7e | 115 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 116 | struct ifreq ifr; |
d607032d WC |
117 | struct ip_tunnel_parm p; |
118 | ||
119 | memset(&p, 0, sizeof(p)); | |
120 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
121 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
122 | p.iph.version = 4; | |
123 | p.iph.ihl = 5; | |
124 | p.iph.protocol = IPPROTO_IPIP; | |
125 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
126 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
127 | ||
5bc3eb7e SH |
128 | if (ops->ndo_do_ioctl) { |
129 | mm_segment_t oldfs = get_fs(); | |
130 | ||
131 | set_fs(KERNEL_DS); | |
132 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
133 | set_fs(oldfs); | |
134 | } | |
d607032d WC |
135 | } |
136 | } | |
137 | ||
1da177e4 LT |
138 | static |
139 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
140 | { | |
141 | struct net_device *dev; | |
142 | ||
881d966b | 143 | dev = __dev_get_by_name(&init_net, "tunl0"); |
1da177e4 LT |
144 | |
145 | if (dev) { | |
5bc3eb7e | 146 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
147 | int err; |
148 | struct ifreq ifr; | |
1da177e4 LT |
149 | struct ip_tunnel_parm p; |
150 | struct in_device *in_dev; | |
151 | ||
152 | memset(&p, 0, sizeof(p)); | |
153 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
154 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
155 | p.iph.version = 4; | |
156 | p.iph.ihl = 5; | |
157 | p.iph.protocol = IPPROTO_IPIP; | |
158 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 159 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 160 | |
5bc3eb7e SH |
161 | if (ops->ndo_do_ioctl) { |
162 | mm_segment_t oldfs = get_fs(); | |
163 | ||
164 | set_fs(KERNEL_DS); | |
165 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
166 | set_fs(oldfs); | |
167 | } else | |
168 | err = -EOPNOTSUPP; | |
1da177e4 LT |
169 | |
170 | dev = NULL; | |
171 | ||
881d966b | 172 | if (err == 0 && (dev = __dev_get_by_name(&init_net, p.name)) != NULL) { |
1da177e4 LT |
173 | dev->flags |= IFF_MULTICAST; |
174 | ||
e5ed6399 | 175 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 176 | if (in_dev == NULL) |
1da177e4 | 177 | goto failure; |
71e27da9 HX |
178 | |
179 | ipv4_devconf_setall(in_dev); | |
180 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
181 | |
182 | if (dev_open(dev)) | |
183 | goto failure; | |
7dc00c82 | 184 | dev_hold(dev); |
1da177e4 LT |
185 | } |
186 | } | |
187 | return dev; | |
188 | ||
189 | failure: | |
190 | /* allow the register to be completed before unregistering. */ | |
191 | rtnl_unlock(); | |
192 | rtnl_lock(); | |
193 | ||
194 | unregister_netdevice(dev); | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | #ifdef CONFIG_IP_PIMSM | |
199 | ||
1da177e4 LT |
200 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
201 | { | |
202 | read_lock(&mrt_lock); | |
cf3677ae PE |
203 | dev->stats.tx_bytes += skb->len; |
204 | dev->stats.tx_packets++; | |
6c5143db | 205 | ipmr_cache_report(skb, init_net.ipv4.mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
206 | read_unlock(&mrt_lock); |
207 | kfree_skb(skb); | |
208 | return 0; | |
209 | } | |
210 | ||
007c3838 SH |
211 | static const struct net_device_ops reg_vif_netdev_ops = { |
212 | .ndo_start_xmit = reg_vif_xmit, | |
213 | }; | |
214 | ||
1da177e4 LT |
215 | static void reg_vif_setup(struct net_device *dev) |
216 | { | |
217 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 218 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 219 | dev->flags = IFF_NOARP; |
007c3838 | 220 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 LT |
221 | dev->destructor = free_netdev; |
222 | } | |
223 | ||
224 | static struct net_device *ipmr_reg_vif(void) | |
225 | { | |
226 | struct net_device *dev; | |
227 | struct in_device *in_dev; | |
228 | ||
cf3677ae | 229 | dev = alloc_netdev(0, "pimreg", reg_vif_setup); |
1da177e4 LT |
230 | |
231 | if (dev == NULL) | |
232 | return NULL; | |
233 | ||
234 | if (register_netdevice(dev)) { | |
235 | free_netdev(dev); | |
236 | return NULL; | |
237 | } | |
238 | dev->iflink = 0; | |
239 | ||
71e27da9 HX |
240 | rcu_read_lock(); |
241 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
242 | rcu_read_unlock(); | |
1da177e4 | 243 | goto failure; |
71e27da9 | 244 | } |
1da177e4 | 245 | |
71e27da9 HX |
246 | ipv4_devconf_setall(in_dev); |
247 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
248 | rcu_read_unlock(); | |
1da177e4 LT |
249 | |
250 | if (dev_open(dev)) | |
251 | goto failure; | |
252 | ||
7dc00c82 WC |
253 | dev_hold(dev); |
254 | ||
1da177e4 LT |
255 | return dev; |
256 | ||
257 | failure: | |
258 | /* allow the register to be completed before unregistering. */ | |
259 | rtnl_unlock(); | |
260 | rtnl_lock(); | |
261 | ||
262 | unregister_netdevice(dev); | |
263 | return NULL; | |
264 | } | |
265 | #endif | |
266 | ||
267 | /* | |
268 | * Delete a VIF entry | |
7dc00c82 | 269 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 270 | */ |
e905a9ed | 271 | |
7dc00c82 | 272 | static int vif_delete(int vifi, int notify) |
1da177e4 LT |
273 | { |
274 | struct vif_device *v; | |
275 | struct net_device *dev; | |
276 | struct in_device *in_dev; | |
277 | ||
cf958ae3 | 278 | if (vifi < 0 || vifi >= init_net.ipv4.maxvif) |
1da177e4 LT |
279 | return -EADDRNOTAVAIL; |
280 | ||
cf958ae3 | 281 | v = &init_net.ipv4.vif_table[vifi]; |
1da177e4 LT |
282 | |
283 | write_lock_bh(&mrt_lock); | |
284 | dev = v->dev; | |
285 | v->dev = NULL; | |
286 | ||
287 | if (!dev) { | |
288 | write_unlock_bh(&mrt_lock); | |
289 | return -EADDRNOTAVAIL; | |
290 | } | |
291 | ||
292 | #ifdef CONFIG_IP_PIMSM | |
6c5143db BT |
293 | if (vifi == init_net.ipv4.mroute_reg_vif_num) |
294 | init_net.ipv4.mroute_reg_vif_num = -1; | |
1da177e4 LT |
295 | #endif |
296 | ||
cf958ae3 | 297 | if (vifi+1 == init_net.ipv4.maxvif) { |
1da177e4 LT |
298 | int tmp; |
299 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
cf958ae3 | 300 | if (VIF_EXISTS(&init_net, tmp)) |
1da177e4 LT |
301 | break; |
302 | } | |
cf958ae3 | 303 | init_net.ipv4.maxvif = tmp+1; |
1da177e4 LT |
304 | } |
305 | ||
306 | write_unlock_bh(&mrt_lock); | |
307 | ||
308 | dev_set_allmulti(dev, -1); | |
309 | ||
e5ed6399 | 310 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 311 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
312 | ip_rt_multicast_event(in_dev); |
313 | } | |
314 | ||
7dc00c82 | 315 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
1da177e4 LT |
316 | unregister_netdevice(dev); |
317 | ||
318 | dev_put(dev); | |
319 | return 0; | |
320 | } | |
321 | ||
5c0a66f5 BT |
322 | static inline void ipmr_cache_free(struct mfc_cache *c) |
323 | { | |
324 | release_net(mfc_net(c)); | |
325 | kmem_cache_free(mrt_cachep, c); | |
326 | } | |
327 | ||
1da177e4 LT |
328 | /* Destroy an unresolved cache entry, killing queued skbs |
329 | and reporting error to netlink readers. | |
330 | */ | |
331 | ||
332 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
333 | { | |
334 | struct sk_buff *skb; | |
9ef1d4c7 | 335 | struct nlmsgerr *e; |
1da177e4 | 336 | |
1e8fb3b6 | 337 | atomic_dec(&init_net.ipv4.cache_resolve_queue_len); |
1da177e4 | 338 | |
c354e124 | 339 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 340 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
341 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
342 | nlh->nlmsg_type = NLMSG_ERROR; | |
343 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
344 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
345 | e = NLMSG_DATA(nlh); |
346 | e->error = -ETIMEDOUT; | |
347 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 348 | |
97c53cac | 349 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
1da177e4 LT |
350 | } else |
351 | kfree_skb(skb); | |
352 | } | |
353 | ||
5c0a66f5 | 354 | ipmr_cache_free(c); |
1da177e4 LT |
355 | } |
356 | ||
357 | ||
358 | /* Single timer process for all the unresolved queue. */ | |
359 | ||
360 | static void ipmr_expire_process(unsigned long dummy) | |
361 | { | |
362 | unsigned long now; | |
363 | unsigned long expires; | |
364 | struct mfc_cache *c, **cp; | |
365 | ||
366 | if (!spin_trylock(&mfc_unres_lock)) { | |
367 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
368 | return; | |
369 | } | |
370 | ||
1e8fb3b6 | 371 | if (mfc_unres_queue == NULL) |
1da177e4 LT |
372 | goto out; |
373 | ||
374 | now = jiffies; | |
375 | expires = 10*HZ; | |
376 | cp = &mfc_unres_queue; | |
377 | ||
378 | while ((c=*cp) != NULL) { | |
379 | if (time_after(c->mfc_un.unres.expires, now)) { | |
380 | unsigned long interval = c->mfc_un.unres.expires - now; | |
381 | if (interval < expires) | |
382 | expires = interval; | |
383 | cp = &c->next; | |
384 | continue; | |
385 | } | |
386 | ||
387 | *cp = c->next; | |
388 | ||
389 | ipmr_destroy_unres(c); | |
390 | } | |
391 | ||
1e8fb3b6 | 392 | if (mfc_unres_queue != NULL) |
1da177e4 LT |
393 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
394 | ||
395 | out: | |
396 | spin_unlock(&mfc_unres_lock); | |
397 | } | |
398 | ||
399 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
400 | ||
d1b04c08 | 401 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
402 | { |
403 | int vifi; | |
404 | ||
405 | cache->mfc_un.res.minvif = MAXVIFS; | |
406 | cache->mfc_un.res.maxvif = 0; | |
407 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
408 | ||
cf958ae3 BT |
409 | for (vifi = 0; vifi < init_net.ipv4.maxvif; vifi++) { |
410 | if (VIF_EXISTS(&init_net, vifi) && | |
411 | ttls[vifi] && ttls[vifi] < 255) { | |
1da177e4 LT |
412 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
413 | if (cache->mfc_un.res.minvif > vifi) | |
414 | cache->mfc_un.res.minvif = vifi; | |
415 | if (cache->mfc_un.res.maxvif <= vifi) | |
416 | cache->mfc_un.res.maxvif = vifi + 1; | |
417 | } | |
418 | } | |
419 | } | |
420 | ||
421 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
422 | { | |
423 | int vifi = vifc->vifc_vifi; | |
cf958ae3 | 424 | struct vif_device *v = &init_net.ipv4.vif_table[vifi]; |
1da177e4 LT |
425 | struct net_device *dev; |
426 | struct in_device *in_dev; | |
d607032d | 427 | int err; |
1da177e4 LT |
428 | |
429 | /* Is vif busy ? */ | |
cf958ae3 | 430 | if (VIF_EXISTS(&init_net, vifi)) |
1da177e4 LT |
431 | return -EADDRINUSE; |
432 | ||
433 | switch (vifc->vifc_flags) { | |
434 | #ifdef CONFIG_IP_PIMSM | |
435 | case VIFF_REGISTER: | |
436 | /* | |
437 | * Special Purpose VIF in PIM | |
438 | * All the packets will be sent to the daemon | |
439 | */ | |
6c5143db | 440 | if (init_net.ipv4.mroute_reg_vif_num >= 0) |
1da177e4 LT |
441 | return -EADDRINUSE; |
442 | dev = ipmr_reg_vif(); | |
443 | if (!dev) | |
444 | return -ENOBUFS; | |
d607032d WC |
445 | err = dev_set_allmulti(dev, 1); |
446 | if (err) { | |
447 | unregister_netdevice(dev); | |
7dc00c82 | 448 | dev_put(dev); |
d607032d WC |
449 | return err; |
450 | } | |
1da177e4 LT |
451 | break; |
452 | #endif | |
e905a9ed | 453 | case VIFF_TUNNEL: |
1da177e4 LT |
454 | dev = ipmr_new_tunnel(vifc); |
455 | if (!dev) | |
456 | return -ENOBUFS; | |
d607032d WC |
457 | err = dev_set_allmulti(dev, 1); |
458 | if (err) { | |
459 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 460 | dev_put(dev); |
d607032d WC |
461 | return err; |
462 | } | |
1da177e4 LT |
463 | break; |
464 | case 0: | |
1ab35276 | 465 | dev = ip_dev_find(&init_net, vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
466 | if (!dev) |
467 | return -EADDRNOTAVAIL; | |
d607032d | 468 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
469 | if (err) { |
470 | dev_put(dev); | |
d607032d | 471 | return err; |
7dc00c82 | 472 | } |
1da177e4 LT |
473 | break; |
474 | default: | |
475 | return -EINVAL; | |
476 | } | |
477 | ||
e5ed6399 | 478 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 | 479 | return -EADDRNOTAVAIL; |
42f811b8 | 480 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
481 | ip_rt_multicast_event(in_dev); |
482 | ||
483 | /* | |
484 | * Fill in the VIF structures | |
485 | */ | |
c354e124 JK |
486 | v->rate_limit = vifc->vifc_rate_limit; |
487 | v->local = vifc->vifc_lcl_addr.s_addr; | |
488 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
489 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
490 | if (!mrtsock) |
491 | v->flags |= VIFF_STATIC; | |
c354e124 | 492 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
493 | v->bytes_in = 0; |
494 | v->bytes_out = 0; | |
495 | v->pkt_in = 0; | |
496 | v->pkt_out = 0; | |
497 | v->link = dev->ifindex; | |
498 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
499 | v->link = dev->iflink; | |
500 | ||
501 | /* And finish update writing critical data */ | |
502 | write_lock_bh(&mrt_lock); | |
c354e124 | 503 | v->dev = dev; |
1da177e4 LT |
504 | #ifdef CONFIG_IP_PIMSM |
505 | if (v->flags&VIFF_REGISTER) | |
6c5143db | 506 | init_net.ipv4.mroute_reg_vif_num = vifi; |
1da177e4 | 507 | #endif |
cf958ae3 BT |
508 | if (vifi+1 > init_net.ipv4.maxvif) |
509 | init_net.ipv4.maxvif = vifi+1; | |
1da177e4 LT |
510 | write_unlock_bh(&mrt_lock); |
511 | return 0; | |
512 | } | |
513 | ||
114c7844 | 514 | static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp) |
1da177e4 | 515 | { |
c354e124 | 516 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
517 | struct mfc_cache *c; |
518 | ||
2bb8b26c | 519 | for (c = init_net.ipv4.mfc_cache_array[line]; c; c = c->next) { |
1da177e4 LT |
520 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) |
521 | break; | |
522 | } | |
523 | return c; | |
524 | } | |
525 | ||
526 | /* | |
527 | * Allocate a multicast cache entry | |
528 | */ | |
5c0a66f5 | 529 | static struct mfc_cache *ipmr_cache_alloc(struct net *net) |
1da177e4 | 530 | { |
c354e124 JK |
531 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
532 | if (c == NULL) | |
1da177e4 | 533 | return NULL; |
1da177e4 | 534 | c->mfc_un.res.minvif = MAXVIFS; |
5c0a66f5 | 535 | mfc_net_set(c, net); |
1da177e4 LT |
536 | return c; |
537 | } | |
538 | ||
5c0a66f5 | 539 | static struct mfc_cache *ipmr_cache_alloc_unres(struct net *net) |
1da177e4 | 540 | { |
c354e124 JK |
541 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
542 | if (c == NULL) | |
1da177e4 | 543 | return NULL; |
1da177e4 LT |
544 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
545 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
5c0a66f5 | 546 | mfc_net_set(c, net); |
1da177e4 LT |
547 | return c; |
548 | } | |
549 | ||
550 | /* | |
551 | * A cache entry has gone into a resolved state from queued | |
552 | */ | |
e905a9ed | 553 | |
1da177e4 LT |
554 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
555 | { | |
556 | struct sk_buff *skb; | |
9ef1d4c7 | 557 | struct nlmsgerr *e; |
1da177e4 LT |
558 | |
559 | /* | |
560 | * Play the pending entries through our router | |
561 | */ | |
562 | ||
c354e124 | 563 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 564 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
565 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
566 | ||
567 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
568 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
569 | (u8 *)nlh); | |
1da177e4 LT |
570 | } else { |
571 | nlh->nlmsg_type = NLMSG_ERROR; | |
572 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
573 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
574 | e = NLMSG_DATA(nlh); |
575 | e->error = -EMSGSIZE; | |
576 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 577 | } |
2942e900 | 578 | |
97c53cac | 579 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
1da177e4 LT |
580 | } else |
581 | ip_mr_forward(skb, c, 0); | |
582 | } | |
583 | } | |
584 | ||
585 | /* | |
586 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
587 | * expects the following bizarre scheme. | |
588 | * | |
589 | * Called under mrt_lock. | |
590 | */ | |
e905a9ed | 591 | |
1da177e4 LT |
592 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
593 | { | |
594 | struct sk_buff *skb; | |
c9bdd4b5 | 595 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
596 | struct igmphdr *igmp; |
597 | struct igmpmsg *msg; | |
598 | int ret; | |
599 | ||
600 | #ifdef CONFIG_IP_PIMSM | |
601 | if (assert == IGMPMSG_WHOLEPKT) | |
602 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
603 | else | |
604 | #endif | |
605 | skb = alloc_skb(128, GFP_ATOMIC); | |
606 | ||
132adf54 | 607 | if (!skb) |
1da177e4 LT |
608 | return -ENOBUFS; |
609 | ||
610 | #ifdef CONFIG_IP_PIMSM | |
611 | if (assert == IGMPMSG_WHOLEPKT) { | |
612 | /* Ugly, but we have no choice with this interface. | |
613 | Duplicate old header, fix ihl, length etc. | |
614 | And all this only to mangle msg->im_msgtype and | |
615 | to set msg->im_mbz to "mbz" :-) | |
616 | */ | |
878c8145 ACM |
617 | skb_push(skb, sizeof(struct iphdr)); |
618 | skb_reset_network_header(skb); | |
badff6d0 | 619 | skb_reset_transport_header(skb); |
0272ffc4 | 620 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 621 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
622 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
623 | msg->im_mbz = 0; | |
6c5143db | 624 | msg->im_vif = init_net.ipv4.mroute_reg_vif_num; |
eddc9ec5 ACM |
625 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
626 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
627 | sizeof(struct iphdr)); | |
e905a9ed | 628 | } else |
1da177e4 | 629 | #endif |
e905a9ed YH |
630 | { |
631 | ||
1da177e4 LT |
632 | /* |
633 | * Copy the IP header | |
634 | */ | |
635 | ||
27a884dc | 636 | skb->network_header = skb->tail; |
ddc7b8e3 | 637 | skb_put(skb, ihl); |
27d7ff46 | 638 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
639 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
640 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
641 | msg->im_vif = vifi; |
642 | skb->dst = dst_clone(pkt->dst); | |
643 | ||
644 | /* | |
645 | * Add our header | |
646 | */ | |
647 | ||
c354e124 | 648 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
649 | igmp->type = |
650 | msg->im_msgtype = assert; | |
651 | igmp->code = 0; | |
eddc9ec5 | 652 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 653 | skb->transport_header = skb->network_header; |
e905a9ed | 654 | } |
1da177e4 | 655 | |
70a269e6 | 656 | if (init_net.ipv4.mroute_sk == NULL) { |
1da177e4 LT |
657 | kfree_skb(skb); |
658 | return -EINVAL; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Deliver to mrouted | |
663 | */ | |
70a269e6 BT |
664 | ret = sock_queue_rcv_skb(init_net.ipv4.mroute_sk, skb); |
665 | if (ret < 0) { | |
1da177e4 LT |
666 | if (net_ratelimit()) |
667 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
668 | kfree_skb(skb); | |
669 | } | |
670 | ||
671 | return ret; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Queue a packet for resolution. It gets locked cache entry! | |
676 | */ | |
e905a9ed | 677 | |
1da177e4 LT |
678 | static int |
679 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
680 | { | |
681 | int err; | |
682 | struct mfc_cache *c; | |
eddc9ec5 | 683 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
684 | |
685 | spin_lock_bh(&mfc_unres_lock); | |
686 | for (c=mfc_unres_queue; c; c=c->next) { | |
1e8fb3b6 BT |
687 | if (net_eq(mfc_net(c), &init_net) && |
688 | c->mfc_mcastgrp == iph->daddr && | |
eddc9ec5 | 689 | c->mfc_origin == iph->saddr) |
1da177e4 LT |
690 | break; |
691 | } | |
692 | ||
693 | if (c == NULL) { | |
694 | /* | |
695 | * Create a new entry if allowable | |
696 | */ | |
697 | ||
1e8fb3b6 | 698 | if (atomic_read(&init_net.ipv4.cache_resolve_queue_len) >= 10 || |
5c0a66f5 | 699 | (c = ipmr_cache_alloc_unres(&init_net)) == NULL) { |
1da177e4 LT |
700 | spin_unlock_bh(&mfc_unres_lock); |
701 | ||
702 | kfree_skb(skb); | |
703 | return -ENOBUFS; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Fill in the new cache entry | |
708 | */ | |
eddc9ec5 ACM |
709 | c->mfc_parent = -1; |
710 | c->mfc_origin = iph->saddr; | |
711 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
712 | |
713 | /* | |
714 | * Reflect first query at mrouted. | |
715 | */ | |
716 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
e905a9ed | 717 | /* If the report failed throw the cache entry |
1da177e4 LT |
718 | out - Brad Parker |
719 | */ | |
720 | spin_unlock_bh(&mfc_unres_lock); | |
721 | ||
5c0a66f5 | 722 | ipmr_cache_free(c); |
1da177e4 LT |
723 | kfree_skb(skb); |
724 | return err; | |
725 | } | |
726 | ||
1e8fb3b6 | 727 | atomic_inc(&init_net.ipv4.cache_resolve_queue_len); |
1da177e4 LT |
728 | c->next = mfc_unres_queue; |
729 | mfc_unres_queue = c; | |
730 | ||
731 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
732 | } | |
733 | ||
734 | /* | |
735 | * See if we can append the packet | |
736 | */ | |
737 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
738 | kfree_skb(skb); | |
739 | err = -ENOBUFS; | |
740 | } else { | |
c354e124 | 741 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
742 | err = 0; |
743 | } | |
744 | ||
745 | spin_unlock_bh(&mfc_unres_lock); | |
746 | return err; | |
747 | } | |
748 | ||
749 | /* | |
750 | * MFC cache manipulation by user space mroute daemon | |
751 | */ | |
752 | ||
753 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
754 | { | |
755 | int line; | |
756 | struct mfc_cache *c, **cp; | |
757 | ||
c354e124 | 758 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 759 | |
2bb8b26c BT |
760 | for (cp = &init_net.ipv4.mfc_cache_array[line]; |
761 | (c = *cp) != NULL; cp = &c->next) { | |
1da177e4 LT |
762 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
763 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
764 | write_lock_bh(&mrt_lock); | |
765 | *cp = c->next; | |
766 | write_unlock_bh(&mrt_lock); | |
767 | ||
5c0a66f5 | 768 | ipmr_cache_free(c); |
1da177e4 LT |
769 | return 0; |
770 | } | |
771 | } | |
772 | return -ENOENT; | |
773 | } | |
774 | ||
775 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
776 | { | |
777 | int line; | |
778 | struct mfc_cache *uc, *c, **cp; | |
779 | ||
c354e124 | 780 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 781 | |
2bb8b26c BT |
782 | for (cp = &init_net.ipv4.mfc_cache_array[line]; |
783 | (c = *cp) != NULL; cp = &c->next) { | |
1da177e4 LT |
784 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
785 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
786 | break; | |
787 | } | |
788 | ||
789 | if (c != NULL) { | |
790 | write_lock_bh(&mrt_lock); | |
791 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 792 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
793 | if (!mrtsock) |
794 | c->mfc_flags |= MFC_STATIC; | |
795 | write_unlock_bh(&mrt_lock); | |
796 | return 0; | |
797 | } | |
798 | ||
f97c1e0c | 799 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
800 | return -EINVAL; |
801 | ||
5c0a66f5 | 802 | c = ipmr_cache_alloc(&init_net); |
c354e124 | 803 | if (c == NULL) |
1da177e4 LT |
804 | return -ENOMEM; |
805 | ||
c354e124 JK |
806 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
807 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
808 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 809 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
810 | if (!mrtsock) |
811 | c->mfc_flags |= MFC_STATIC; | |
812 | ||
813 | write_lock_bh(&mrt_lock); | |
2bb8b26c BT |
814 | c->next = init_net.ipv4.mfc_cache_array[line]; |
815 | init_net.ipv4.mfc_cache_array[line] = c; | |
1da177e4 LT |
816 | write_unlock_bh(&mrt_lock); |
817 | ||
818 | /* | |
819 | * Check to see if we resolved a queued list. If so we | |
820 | * need to send on the frames and tidy up. | |
821 | */ | |
822 | spin_lock_bh(&mfc_unres_lock); | |
823 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
824 | cp = &uc->next) { | |
1e8fb3b6 BT |
825 | if (net_eq(mfc_net(uc), &init_net) && |
826 | uc->mfc_origin == c->mfc_origin && | |
1da177e4 LT |
827 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
828 | *cp = uc->next; | |
1e8fb3b6 | 829 | atomic_dec(&init_net.ipv4.cache_resolve_queue_len); |
1da177e4 LT |
830 | break; |
831 | } | |
832 | } | |
1e8fb3b6 BT |
833 | if (mfc_unres_queue == NULL) |
834 | del_timer(&ipmr_expire_timer); | |
1da177e4 LT |
835 | spin_unlock_bh(&mfc_unres_lock); |
836 | ||
837 | if (uc) { | |
838 | ipmr_cache_resolve(uc, c); | |
5c0a66f5 | 839 | ipmr_cache_free(uc); |
1da177e4 LT |
840 | } |
841 | return 0; | |
842 | } | |
843 | ||
844 | /* | |
845 | * Close the multicast socket, and clear the vif tables etc | |
846 | */ | |
e905a9ed | 847 | |
1da177e4 LT |
848 | static void mroute_clean_tables(struct sock *sk) |
849 | { | |
850 | int i; | |
e905a9ed | 851 | |
1da177e4 LT |
852 | /* |
853 | * Shut down all active vif entries | |
854 | */ | |
cf958ae3 BT |
855 | for (i = 0; i < init_net.ipv4.maxvif; i++) { |
856 | if (!(init_net.ipv4.vif_table[i].flags&VIFF_STATIC)) | |
7dc00c82 | 857 | vif_delete(i, 0); |
1da177e4 LT |
858 | } |
859 | ||
860 | /* | |
861 | * Wipe the cache | |
862 | */ | |
c354e124 | 863 | for (i=0; i<MFC_LINES; i++) { |
1da177e4 LT |
864 | struct mfc_cache *c, **cp; |
865 | ||
2bb8b26c | 866 | cp = &init_net.ipv4.mfc_cache_array[i]; |
1da177e4 LT |
867 | while ((c = *cp) != NULL) { |
868 | if (c->mfc_flags&MFC_STATIC) { | |
869 | cp = &c->next; | |
870 | continue; | |
871 | } | |
872 | write_lock_bh(&mrt_lock); | |
873 | *cp = c->next; | |
874 | write_unlock_bh(&mrt_lock); | |
875 | ||
5c0a66f5 | 876 | ipmr_cache_free(c); |
1da177e4 LT |
877 | } |
878 | } | |
879 | ||
1e8fb3b6 BT |
880 | if (atomic_read(&init_net.ipv4.cache_resolve_queue_len) != 0) { |
881 | struct mfc_cache *c, **cp; | |
1da177e4 LT |
882 | |
883 | spin_lock_bh(&mfc_unres_lock); | |
1e8fb3b6 BT |
884 | cp = &mfc_unres_queue; |
885 | while ((c = *cp) != NULL) { | |
886 | if (!net_eq(mfc_net(c), &init_net)) { | |
887 | cp = &c->next; | |
888 | continue; | |
889 | } | |
890 | *cp = c->next; | |
1da177e4 LT |
891 | |
892 | ipmr_destroy_unres(c); | |
1da177e4 LT |
893 | } |
894 | spin_unlock_bh(&mfc_unres_lock); | |
895 | } | |
896 | } | |
897 | ||
898 | static void mrtsock_destruct(struct sock *sk) | |
899 | { | |
900 | rtnl_lock(); | |
70a269e6 | 901 | if (sk == init_net.ipv4.mroute_sk) { |
3b1e0a65 | 902 | IPV4_DEVCONF_ALL(sock_net(sk), MC_FORWARDING)--; |
1da177e4 LT |
903 | |
904 | write_lock_bh(&mrt_lock); | |
70a269e6 | 905 | init_net.ipv4.mroute_sk = NULL; |
1da177e4 LT |
906 | write_unlock_bh(&mrt_lock); |
907 | ||
908 | mroute_clean_tables(sk); | |
909 | } | |
910 | rtnl_unlock(); | |
911 | } | |
912 | ||
913 | /* | |
914 | * Socket options and virtual interface manipulation. The whole | |
915 | * virtual interface system is a complete heap, but unfortunately | |
916 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
917 | * MOSPF/PIM router set up we can clean this up. | |
918 | */ | |
e905a9ed | 919 | |
c354e124 | 920 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) |
1da177e4 LT |
921 | { |
922 | int ret; | |
923 | struct vifctl vif; | |
924 | struct mfcctl mfc; | |
e905a9ed | 925 | |
132adf54 | 926 | if (optname != MRT_INIT) { |
70a269e6 | 927 | if (sk != init_net.ipv4.mroute_sk && !capable(CAP_NET_ADMIN)) |
1da177e4 LT |
928 | return -EACCES; |
929 | } | |
930 | ||
132adf54 SH |
931 | switch (optname) { |
932 | case MRT_INIT: | |
933 | if (sk->sk_type != SOCK_RAW || | |
934 | inet_sk(sk)->num != IPPROTO_IGMP) | |
935 | return -EOPNOTSUPP; | |
c354e124 | 936 | if (optlen != sizeof(int)) |
132adf54 | 937 | return -ENOPROTOOPT; |
1da177e4 | 938 | |
132adf54 | 939 | rtnl_lock(); |
70a269e6 | 940 | if (init_net.ipv4.mroute_sk) { |
1da177e4 | 941 | rtnl_unlock(); |
132adf54 SH |
942 | return -EADDRINUSE; |
943 | } | |
944 | ||
945 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
946 | if (ret == 0) { | |
947 | write_lock_bh(&mrt_lock); | |
70a269e6 | 948 | init_net.ipv4.mroute_sk = sk; |
132adf54 SH |
949 | write_unlock_bh(&mrt_lock); |
950 | ||
3b1e0a65 | 951 | IPV4_DEVCONF_ALL(sock_net(sk), MC_FORWARDING)++; |
132adf54 SH |
952 | } |
953 | rtnl_unlock(); | |
954 | return ret; | |
955 | case MRT_DONE: | |
70a269e6 | 956 | if (sk != init_net.ipv4.mroute_sk) |
132adf54 SH |
957 | return -EACCES; |
958 | return ip_ra_control(sk, 0, NULL); | |
959 | case MRT_ADD_VIF: | |
960 | case MRT_DEL_VIF: | |
c354e124 | 961 | if (optlen != sizeof(vif)) |
132adf54 | 962 | return -EINVAL; |
c354e124 | 963 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
964 | return -EFAULT; |
965 | if (vif.vifc_vifi >= MAXVIFS) | |
966 | return -ENFILE; | |
967 | rtnl_lock(); | |
c354e124 | 968 | if (optname == MRT_ADD_VIF) { |
70a269e6 | 969 | ret = vif_add(&vif, sk == init_net.ipv4.mroute_sk); |
132adf54 | 970 | } else { |
7dc00c82 | 971 | ret = vif_delete(vif.vifc_vifi, 0); |
132adf54 SH |
972 | } |
973 | rtnl_unlock(); | |
974 | return ret; | |
1da177e4 LT |
975 | |
976 | /* | |
977 | * Manipulate the forwarding caches. These live | |
978 | * in a sort of kernel/user symbiosis. | |
979 | */ | |
132adf54 SH |
980 | case MRT_ADD_MFC: |
981 | case MRT_DEL_MFC: | |
c354e124 | 982 | if (optlen != sizeof(mfc)) |
132adf54 | 983 | return -EINVAL; |
c354e124 | 984 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
985 | return -EFAULT; |
986 | rtnl_lock(); | |
c354e124 | 987 | if (optname == MRT_DEL_MFC) |
132adf54 SH |
988 | ret = ipmr_mfc_delete(&mfc); |
989 | else | |
70a269e6 | 990 | ret = ipmr_mfc_add(&mfc, sk == init_net.ipv4.mroute_sk); |
132adf54 SH |
991 | rtnl_unlock(); |
992 | return ret; | |
1da177e4 LT |
993 | /* |
994 | * Control PIM assert. | |
995 | */ | |
132adf54 SH |
996 | case MRT_ASSERT: |
997 | { | |
998 | int v; | |
999 | if (get_user(v,(int __user *)optval)) | |
1000 | return -EFAULT; | |
6f9374a9 | 1001 | init_net.ipv4.mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1002 | return 0; |
1003 | } | |
1da177e4 | 1004 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1005 | case MRT_PIM: |
1006 | { | |
ba93ef74 SH |
1007 | int v; |
1008 | ||
132adf54 SH |
1009 | if (get_user(v,(int __user *)optval)) |
1010 | return -EFAULT; | |
ba93ef74 SH |
1011 | v = (v) ? 1 : 0; |
1012 | ||
132adf54 SH |
1013 | rtnl_lock(); |
1014 | ret = 0; | |
6f9374a9 BT |
1015 | if (v != init_net.ipv4.mroute_do_pim) { |
1016 | init_net.ipv4.mroute_do_pim = v; | |
1017 | init_net.ipv4.mroute_do_assert = v; | |
1da177e4 | 1018 | #ifdef CONFIG_IP_PIMSM_V2 |
6f9374a9 | 1019 | if (init_net.ipv4.mroute_do_pim) |
132adf54 SH |
1020 | ret = inet_add_protocol(&pim_protocol, |
1021 | IPPROTO_PIM); | |
1022 | else | |
1023 | ret = inet_del_protocol(&pim_protocol, | |
1024 | IPPROTO_PIM); | |
1025 | if (ret < 0) | |
1026 | ret = -EAGAIN; | |
1da177e4 | 1027 | #endif |
1da177e4 | 1028 | } |
132adf54 SH |
1029 | rtnl_unlock(); |
1030 | return ret; | |
1031 | } | |
1da177e4 | 1032 | #endif |
132adf54 SH |
1033 | /* |
1034 | * Spurious command, or MRT_VERSION which you cannot | |
1035 | * set. | |
1036 | */ | |
1037 | default: | |
1038 | return -ENOPROTOOPT; | |
1da177e4 LT |
1039 | } |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * Getsock opt support for the multicast routing system. | |
1044 | */ | |
e905a9ed | 1045 | |
c354e124 | 1046 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1047 | { |
1048 | int olr; | |
1049 | int val; | |
1050 | ||
c354e124 | 1051 | if (optname != MRT_VERSION && |
1da177e4 LT |
1052 | #ifdef CONFIG_IP_PIMSM |
1053 | optname!=MRT_PIM && | |
1054 | #endif | |
1055 | optname!=MRT_ASSERT) | |
1056 | return -ENOPROTOOPT; | |
1057 | ||
1058 | if (get_user(olr, optlen)) | |
1059 | return -EFAULT; | |
1060 | ||
1061 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1062 | if (olr < 0) | |
1063 | return -EINVAL; | |
e905a9ed | 1064 | |
c354e124 | 1065 | if (put_user(olr, optlen)) |
1da177e4 | 1066 | return -EFAULT; |
c354e124 JK |
1067 | if (optname == MRT_VERSION) |
1068 | val = 0x0305; | |
1da177e4 | 1069 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1070 | else if (optname == MRT_PIM) |
6f9374a9 | 1071 | val = init_net.ipv4.mroute_do_pim; |
1da177e4 LT |
1072 | #endif |
1073 | else | |
6f9374a9 | 1074 | val = init_net.ipv4.mroute_do_assert; |
c354e124 | 1075 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1076 | return -EFAULT; |
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * The IP multicast ioctl support routines. | |
1082 | */ | |
e905a9ed | 1083 | |
1da177e4 LT |
1084 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1085 | { | |
1086 | struct sioc_sg_req sr; | |
1087 | struct sioc_vif_req vr; | |
1088 | struct vif_device *vif; | |
1089 | struct mfc_cache *c; | |
e905a9ed | 1090 | |
132adf54 SH |
1091 | switch (cmd) { |
1092 | case SIOCGETVIFCNT: | |
c354e124 | 1093 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1094 | return -EFAULT; |
cf958ae3 | 1095 | if (vr.vifi >= init_net.ipv4.maxvif) |
132adf54 SH |
1096 | return -EINVAL; |
1097 | read_lock(&mrt_lock); | |
cf958ae3 BT |
1098 | vif = &init_net.ipv4.vif_table[vr.vifi]; |
1099 | if (VIF_EXISTS(&init_net, vr.vifi)) { | |
c354e124 JK |
1100 | vr.icount = vif->pkt_in; |
1101 | vr.ocount = vif->pkt_out; | |
1102 | vr.ibytes = vif->bytes_in; | |
1103 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1104 | read_unlock(&mrt_lock); |
1da177e4 | 1105 | |
c354e124 | 1106 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1107 | return -EFAULT; |
1108 | return 0; | |
1109 | } | |
1110 | read_unlock(&mrt_lock); | |
1111 | return -EADDRNOTAVAIL; | |
1112 | case SIOCGETSGCNT: | |
c354e124 | 1113 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1114 | return -EFAULT; |
1115 | ||
1116 | read_lock(&mrt_lock); | |
1117 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1118 | if (c) { | |
1119 | sr.pktcnt = c->mfc_un.res.pkt; | |
1120 | sr.bytecnt = c->mfc_un.res.bytes; | |
1121 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1122 | read_unlock(&mrt_lock); |
132adf54 | 1123 | |
c354e124 | 1124 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1125 | return -EFAULT; |
1126 | return 0; | |
1127 | } | |
1128 | read_unlock(&mrt_lock); | |
1129 | return -EADDRNOTAVAIL; | |
1130 | default: | |
1131 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1132 | } |
1133 | } | |
1134 | ||
1135 | ||
1136 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1137 | { | |
e9dc8653 | 1138 | struct net_device *dev = ptr; |
1da177e4 LT |
1139 | struct vif_device *v; |
1140 | int ct; | |
e9dc8653 | 1141 | |
721499e8 | 1142 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
1143 | return NOTIFY_DONE; |
1144 | ||
1da177e4 LT |
1145 | if (event != NETDEV_UNREGISTER) |
1146 | return NOTIFY_DONE; | |
cf958ae3 BT |
1147 | v = &init_net.ipv4.vif_table[0]; |
1148 | for (ct = 0; ct < init_net.ipv4.maxvif; ct++, v++) { | |
c354e124 | 1149 | if (v->dev == dev) |
7dc00c82 | 1150 | vif_delete(ct, 1); |
1da177e4 LT |
1151 | } |
1152 | return NOTIFY_DONE; | |
1153 | } | |
1154 | ||
1155 | ||
c354e124 | 1156 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1157 | .notifier_call = ipmr_device_event, |
1158 | }; | |
1159 | ||
1160 | /* | |
1161 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1162 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1163 | * important for multicast video. | |
1164 | */ | |
e905a9ed | 1165 | |
114c7844 | 1166 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1167 | { |
8856dfa3 | 1168 | struct iphdr *iph; |
eddc9ec5 | 1169 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1170 | |
1171 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1172 | skb->transport_header = skb->network_header; |
8856dfa3 | 1173 | skb_reset_network_header(skb); |
eddc9ec5 | 1174 | iph = ip_hdr(skb); |
1da177e4 LT |
1175 | |
1176 | iph->version = 4; | |
e023dd64 ACM |
1177 | iph->tos = old_iph->tos; |
1178 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1179 | iph->frag_off = 0; |
1180 | iph->daddr = daddr; | |
1181 | iph->saddr = saddr; | |
1182 | iph->protocol = IPPROTO_IPIP; | |
1183 | iph->ihl = 5; | |
1184 | iph->tot_len = htons(skb->len); | |
1185 | ip_select_ident(iph, skb->dst, NULL); | |
1186 | ip_send_check(iph); | |
1187 | ||
1da177e4 LT |
1188 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1189 | nf_reset(skb); | |
1190 | } | |
1191 | ||
1192 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1193 | { | |
1194 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1195 | ||
7c73a6fa | 1196 | IP_INC_STATS_BH(dev_net(skb->dst->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1197 | |
1198 | if (unlikely(opt->optlen)) | |
1199 | ip_forward_options(skb); | |
1200 | ||
1201 | return dst_output(skb); | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Processing handlers for ipmr_forward | |
1206 | */ | |
1207 | ||
1208 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1209 | { | |
eddc9ec5 | 1210 | const struct iphdr *iph = ip_hdr(skb); |
cf958ae3 | 1211 | struct vif_device *vif = &init_net.ipv4.vif_table[vifi]; |
1da177e4 LT |
1212 | struct net_device *dev; |
1213 | struct rtable *rt; | |
1214 | int encap = 0; | |
1215 | ||
1216 | if (vif->dev == NULL) | |
1217 | goto out_free; | |
1218 | ||
1219 | #ifdef CONFIG_IP_PIMSM | |
1220 | if (vif->flags & VIFF_REGISTER) { | |
1221 | vif->pkt_out++; | |
c354e124 | 1222 | vif->bytes_out += skb->len; |
cf3677ae PE |
1223 | vif->dev->stats.tx_bytes += skb->len; |
1224 | vif->dev->stats.tx_packets++; | |
1da177e4 LT |
1225 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
1226 | kfree_skb(skb); | |
1227 | return; | |
1228 | } | |
1229 | #endif | |
1230 | ||
1231 | if (vif->flags&VIFF_TUNNEL) { | |
1232 | struct flowi fl = { .oif = vif->link, | |
1233 | .nl_u = { .ip4_u = | |
1234 | { .daddr = vif->remote, | |
1235 | .saddr = vif->local, | |
1236 | .tos = RT_TOS(iph->tos) } }, | |
1237 | .proto = IPPROTO_IPIP }; | |
f206351a | 1238 | if (ip_route_output_key(&init_net, &rt, &fl)) |
1da177e4 LT |
1239 | goto out_free; |
1240 | encap = sizeof(struct iphdr); | |
1241 | } else { | |
1242 | struct flowi fl = { .oif = vif->link, | |
1243 | .nl_u = { .ip4_u = | |
1244 | { .daddr = iph->daddr, | |
1245 | .tos = RT_TOS(iph->tos) } }, | |
1246 | .proto = IPPROTO_IPIP }; | |
f206351a | 1247 | if (ip_route_output_key(&init_net, &rt, &fl)) |
1da177e4 LT |
1248 | goto out_free; |
1249 | } | |
1250 | ||
1251 | dev = rt->u.dst.dev; | |
1252 | ||
1253 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1254 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1255 | allow to send ICMP, so that packets will disappear | |
1256 | to blackhole. | |
1257 | */ | |
1258 | ||
7c73a6fa | 1259 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1260 | ip_rt_put(rt); |
1261 | goto out_free; | |
1262 | } | |
1263 | ||
1264 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1265 | ||
1266 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1267 | ip_rt_put(rt); |
1da177e4 LT |
1268 | goto out_free; |
1269 | } | |
1270 | ||
1271 | vif->pkt_out++; | |
c354e124 | 1272 | vif->bytes_out += skb->len; |
1da177e4 LT |
1273 | |
1274 | dst_release(skb->dst); | |
1275 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1276 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1277 | |
1278 | /* FIXME: forward and output firewalls used to be called here. | |
1279 | * What do we do with netfilter? -- RR */ | |
1280 | if (vif->flags & VIFF_TUNNEL) { | |
1281 | ip_encap(skb, vif->local, vif->remote); | |
1282 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1283 | vif->dev->stats.tx_packets++; |
1284 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1285 | } |
1286 | ||
1287 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1288 | ||
1289 | /* | |
1290 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1291 | * not only before forwarding, but after forwarding on all output | |
1292 | * interfaces. It is clear, if mrouter runs a multicasting | |
1293 | * program, it should receive packets not depending to what interface | |
1294 | * program is joined. | |
1295 | * If we will not make it, the program will have to join on all | |
1296 | * interfaces. On the other hand, multihoming host (or router, but | |
1297 | * not mrouter) cannot join to more than one interface - it will | |
1298 | * result in receiving multiple packets. | |
1299 | */ | |
6e23ae2a | 1300 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1301 | ipmr_forward_finish); |
1302 | return; | |
1303 | ||
1304 | out_free: | |
1305 | kfree_skb(skb); | |
1306 | return; | |
1307 | } | |
1308 | ||
1309 | static int ipmr_find_vif(struct net_device *dev) | |
1310 | { | |
1311 | int ct; | |
cf958ae3 BT |
1312 | for (ct = init_net.ipv4.maxvif-1; ct >= 0; ct--) { |
1313 | if (init_net.ipv4.vif_table[ct].dev == dev) | |
1da177e4 LT |
1314 | break; |
1315 | } | |
1316 | return ct; | |
1317 | } | |
1318 | ||
1319 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1320 | ||
1321 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1322 | { | |
1323 | int psend = -1; | |
1324 | int vif, ct; | |
1325 | ||
1326 | vif = cache->mfc_parent; | |
1327 | cache->mfc_un.res.pkt++; | |
1328 | cache->mfc_un.res.bytes += skb->len; | |
1329 | ||
1330 | /* | |
1331 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1332 | */ | |
cf958ae3 | 1333 | if (init_net.ipv4.vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1334 | int true_vifi; |
1335 | ||
ee6b9673 | 1336 | if (skb->rtable->fl.iif == 0) { |
1da177e4 LT |
1337 | /* It is our own packet, looped back. |
1338 | Very complicated situation... | |
1339 | ||
1340 | The best workaround until routing daemons will be | |
1341 | fixed is not to redistribute packet, if it was | |
1342 | send through wrong interface. It means, that | |
1343 | multicast applications WILL NOT work for | |
1344 | (S,G), which have default multicast route pointing | |
1345 | to wrong oif. In any case, it is not a good | |
1346 | idea to use multicasting applications on router. | |
1347 | */ | |
1348 | goto dont_forward; | |
1349 | } | |
1350 | ||
1351 | cache->mfc_un.res.wrong_if++; | |
1352 | true_vifi = ipmr_find_vif(skb->dev); | |
1353 | ||
6f9374a9 | 1354 | if (true_vifi >= 0 && init_net.ipv4.mroute_do_assert && |
1da177e4 LT |
1355 | /* pimsm uses asserts, when switching from RPT to SPT, |
1356 | so that we cannot check that packet arrived on an oif. | |
1357 | It is bad, but otherwise we would need to move pretty | |
1358 | large chunk of pimd to kernel. Ough... --ANK | |
1359 | */ | |
6f9374a9 BT |
1360 | (init_net.ipv4.mroute_do_pim || |
1361 | cache->mfc_un.res.ttls[true_vifi] < 255) && | |
e905a9ed | 1362 | time_after(jiffies, |
1da177e4 LT |
1363 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1364 | cache->mfc_un.res.last_assert = jiffies; | |
1365 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1366 | } | |
1367 | goto dont_forward; | |
1368 | } | |
1369 | ||
cf958ae3 BT |
1370 | init_net.ipv4.vif_table[vif].pkt_in++; |
1371 | init_net.ipv4.vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1372 | |
1373 | /* | |
1374 | * Forward the frame | |
1375 | */ | |
1376 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1377 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1378 | if (psend != -1) { |
1379 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1380 | if (skb2) | |
1381 | ipmr_queue_xmit(skb2, cache, psend); | |
1382 | } | |
c354e124 | 1383 | psend = ct; |
1da177e4 LT |
1384 | } |
1385 | } | |
1386 | if (psend != -1) { | |
1387 | if (local) { | |
1388 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1389 | if (skb2) | |
1390 | ipmr_queue_xmit(skb2, cache, psend); | |
1391 | } else { | |
1392 | ipmr_queue_xmit(skb, cache, psend); | |
1393 | return 0; | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | dont_forward: | |
1398 | if (!local) | |
1399 | kfree_skb(skb); | |
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | ||
1404 | /* | |
1405 | * Multicast packets for forwarding arrive here | |
1406 | */ | |
1407 | ||
1408 | int ip_mr_input(struct sk_buff *skb) | |
1409 | { | |
1410 | struct mfc_cache *cache; | |
ee6b9673 | 1411 | int local = skb->rtable->rt_flags&RTCF_LOCAL; |
1da177e4 LT |
1412 | |
1413 | /* Packet is looped back after forward, it should not be | |
1414 | forwarded second time, but still can be delivered locally. | |
1415 | */ | |
1416 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1417 | goto dont_forward; | |
1418 | ||
1419 | if (!local) { | |
1420 | if (IPCB(skb)->opt.router_alert) { | |
1421 | if (ip_call_ra_chain(skb)) | |
1422 | return 0; | |
eddc9ec5 | 1423 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1424 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1425 | Cisco IOS <= 11.2(8)) do not put router alert | |
1426 | option to IGMP packets destined to routable | |
1427 | groups. It is very bad, because it means | |
1428 | that we can forward NO IGMP messages. | |
1429 | */ | |
1430 | read_lock(&mrt_lock); | |
70a269e6 | 1431 | if (init_net.ipv4.mroute_sk) { |
2715bcf9 | 1432 | nf_reset(skb); |
70a269e6 | 1433 | raw_rcv(init_net.ipv4.mroute_sk, skb); |
1da177e4 LT |
1434 | read_unlock(&mrt_lock); |
1435 | return 0; | |
1436 | } | |
1437 | read_unlock(&mrt_lock); | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | read_lock(&mrt_lock); | |
eddc9ec5 | 1442 | cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1443 | |
1444 | /* | |
1445 | * No usable cache entry | |
1446 | */ | |
c354e124 | 1447 | if (cache == NULL) { |
1da177e4 LT |
1448 | int vif; |
1449 | ||
1450 | if (local) { | |
1451 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1452 | ip_local_deliver(skb); | |
1453 | if (skb2 == NULL) { | |
1454 | read_unlock(&mrt_lock); | |
1455 | return -ENOBUFS; | |
1456 | } | |
1457 | skb = skb2; | |
1458 | } | |
1459 | ||
1460 | vif = ipmr_find_vif(skb->dev); | |
1461 | if (vif >= 0) { | |
1462 | int err = ipmr_cache_unresolved(vif, skb); | |
1463 | read_unlock(&mrt_lock); | |
1464 | ||
1465 | return err; | |
1466 | } | |
1467 | read_unlock(&mrt_lock); | |
1468 | kfree_skb(skb); | |
1469 | return -ENODEV; | |
1470 | } | |
1471 | ||
1472 | ip_mr_forward(skb, cache, local); | |
1473 | ||
1474 | read_unlock(&mrt_lock); | |
1475 | ||
1476 | if (local) | |
1477 | return ip_local_deliver(skb); | |
1478 | ||
1479 | return 0; | |
1480 | ||
1481 | dont_forward: | |
1482 | if (local) | |
1483 | return ip_local_deliver(skb); | |
1484 | kfree_skb(skb); | |
1485 | return 0; | |
1486 | } | |
1487 | ||
b1879204 IJ |
1488 | #ifdef CONFIG_IP_PIMSM |
1489 | static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen) | |
1da177e4 | 1490 | { |
b1879204 IJ |
1491 | struct net_device *reg_dev = NULL; |
1492 | struct iphdr *encap; | |
1da177e4 | 1493 | |
b1879204 | 1494 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1495 | /* |
1496 | Check that: | |
1497 | a. packet is really destinted to a multicast group | |
1498 | b. packet is not a NULL-REGISTER | |
1499 | c. packet is not truncated | |
1500 | */ | |
f97c1e0c | 1501 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1502 | encap->tot_len == 0 || |
b1879204 IJ |
1503 | ntohs(encap->tot_len) + pimlen > skb->len) |
1504 | return 1; | |
1da177e4 LT |
1505 | |
1506 | read_lock(&mrt_lock); | |
6c5143db BT |
1507 | if (init_net.ipv4.mroute_reg_vif_num >= 0) |
1508 | reg_dev = init_net.ipv4.vif_table[init_net.ipv4.mroute_reg_vif_num].dev; | |
1da177e4 LT |
1509 | if (reg_dev) |
1510 | dev_hold(reg_dev); | |
1511 | read_unlock(&mrt_lock); | |
1512 | ||
e905a9ed | 1513 | if (reg_dev == NULL) |
b1879204 | 1514 | return 1; |
1da177e4 | 1515 | |
b0e380b1 | 1516 | skb->mac_header = skb->network_header; |
1da177e4 | 1517 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1518 | skb_reset_network_header(skb); |
1da177e4 | 1519 | skb->dev = reg_dev; |
1da177e4 LT |
1520 | skb->protocol = htons(ETH_P_IP); |
1521 | skb->ip_summed = 0; | |
1522 | skb->pkt_type = PACKET_HOST; | |
1523 | dst_release(skb->dst); | |
1524 | skb->dst = NULL; | |
cf3677ae PE |
1525 | reg_dev->stats.rx_bytes += skb->len; |
1526 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1527 | nf_reset(skb); |
1528 | netif_rx(skb); | |
1529 | dev_put(reg_dev); | |
b1879204 | 1530 | |
1da177e4 | 1531 | return 0; |
b1879204 IJ |
1532 | } |
1533 | #endif | |
1534 | ||
1535 | #ifdef CONFIG_IP_PIMSM_V1 | |
1536 | /* | |
1537 | * Handle IGMP messages of PIMv1 | |
1538 | */ | |
1539 | ||
1540 | int pim_rcv_v1(struct sk_buff * skb) | |
1541 | { | |
1542 | struct igmphdr *pim; | |
1543 | ||
1544 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1545 | goto drop; | |
1546 | ||
1547 | pim = igmp_hdr(skb); | |
1548 | ||
6f9374a9 | 1549 | if (!init_net.ipv4.mroute_do_pim || |
b1879204 IJ |
1550 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1551 | goto drop; | |
1552 | ||
1553 | if (__pim_rcv(skb, sizeof(*pim))) { | |
1554 | drop: | |
1555 | kfree_skb(skb); | |
1556 | } | |
1da177e4 LT |
1557 | return 0; |
1558 | } | |
1559 | #endif | |
1560 | ||
1561 | #ifdef CONFIG_IP_PIMSM_V2 | |
1562 | static int pim_rcv(struct sk_buff * skb) | |
1563 | { | |
1564 | struct pimreghdr *pim; | |
1da177e4 | 1565 | |
b1879204 | 1566 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1567 | goto drop; |
1568 | ||
9c70220b | 1569 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1570 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1571 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1572 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1573 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1574 | goto drop; |
1575 | ||
b1879204 IJ |
1576 | if (__pim_rcv(skb, sizeof(*pim))) { |
1577 | drop: | |
1578 | kfree_skb(skb); | |
1579 | } | |
1da177e4 LT |
1580 | return 0; |
1581 | } | |
1582 | #endif | |
1583 | ||
1584 | static int | |
1585 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1586 | { | |
1587 | int ct; | |
1588 | struct rtnexthop *nhp; | |
cf958ae3 | 1589 | struct net_device *dev = init_net.ipv4.vif_table[c->mfc_parent].dev; |
27a884dc | 1590 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1591 | struct rtattr *mp_head; |
1592 | ||
1593 | if (dev) | |
1594 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1595 | ||
c354e124 | 1596 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1597 | |
1598 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1599 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1600 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1601 | goto rtattr_failure; | |
c354e124 | 1602 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1603 | nhp->rtnh_flags = 0; |
1604 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
cf958ae3 | 1605 | nhp->rtnh_ifindex = init_net.ipv4.vif_table[ct].dev->ifindex; |
1da177e4 LT |
1606 | nhp->rtnh_len = sizeof(*nhp); |
1607 | } | |
1608 | } | |
1609 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1610 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1611 | rtm->rtm_type = RTN_MULTICAST; |
1612 | return 1; | |
1613 | ||
1614 | rtattr_failure: | |
dc5fc579 | 1615 | nlmsg_trim(skb, b); |
1da177e4 LT |
1616 | return -EMSGSIZE; |
1617 | } | |
1618 | ||
1619 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1620 | { | |
1621 | int err; | |
1622 | struct mfc_cache *cache; | |
ee6b9673 | 1623 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1624 | |
1625 | read_lock(&mrt_lock); | |
1626 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1627 | ||
c354e124 | 1628 | if (cache == NULL) { |
72287490 | 1629 | struct sk_buff *skb2; |
eddc9ec5 | 1630 | struct iphdr *iph; |
1da177e4 LT |
1631 | struct net_device *dev; |
1632 | int vif; | |
1633 | ||
1634 | if (nowait) { | |
1635 | read_unlock(&mrt_lock); | |
1636 | return -EAGAIN; | |
1637 | } | |
1638 | ||
1639 | dev = skb->dev; | |
1640 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1641 | read_unlock(&mrt_lock); | |
1642 | return -ENODEV; | |
1643 | } | |
72287490 AK |
1644 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1645 | if (!skb2) { | |
1646 | read_unlock(&mrt_lock); | |
1647 | return -ENOMEM; | |
1648 | } | |
1649 | ||
e2d1bca7 ACM |
1650 | skb_push(skb2, sizeof(struct iphdr)); |
1651 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1652 | iph = ip_hdr(skb2); |
1653 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1654 | iph->saddr = rt->rt_src; | |
1655 | iph->daddr = rt->rt_dst; | |
1656 | iph->version = 0; | |
72287490 | 1657 | err = ipmr_cache_unresolved(vif, skb2); |
1da177e4 LT |
1658 | read_unlock(&mrt_lock); |
1659 | return err; | |
1660 | } | |
1661 | ||
1662 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1663 | cache->mfc_flags |= MFC_NOTIFY; | |
1664 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1665 | read_unlock(&mrt_lock); | |
1666 | return err; | |
1667 | } | |
1668 | ||
e905a9ed | 1669 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1670 | /* |
1671 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1672 | */ | |
1673 | struct ipmr_vif_iter { | |
f6bb4514 | 1674 | struct seq_net_private p; |
1da177e4 LT |
1675 | int ct; |
1676 | }; | |
1677 | ||
f6bb4514 BT |
1678 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
1679 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
1680 | loff_t pos) |
1681 | { | |
f6bb4514 BT |
1682 | for (iter->ct = 0; iter->ct < net->ipv4.maxvif; ++iter->ct) { |
1683 | if (!VIF_EXISTS(net, iter->ct)) | |
1da177e4 | 1684 | continue; |
e905a9ed | 1685 | if (pos-- == 0) |
f6bb4514 | 1686 | return &net->ipv4.vif_table[iter->ct]; |
1da177e4 LT |
1687 | } |
1688 | return NULL; | |
1689 | } | |
1690 | ||
1691 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 1692 | __acquires(mrt_lock) |
1da177e4 | 1693 | { |
f6bb4514 BT |
1694 | struct net *net = seq_file_net(seq); |
1695 | ||
1da177e4 | 1696 | read_lock(&mrt_lock); |
f6bb4514 | 1697 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
1698 | : SEQ_START_TOKEN; |
1699 | } | |
1700 | ||
1701 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1702 | { | |
1703 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 1704 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1705 | |
1706 | ++*pos; | |
1707 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 1708 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 1709 | |
f6bb4514 BT |
1710 | while (++iter->ct < net->ipv4.maxvif) { |
1711 | if (!VIF_EXISTS(net, iter->ct)) | |
1da177e4 | 1712 | continue; |
f6bb4514 | 1713 | return &net->ipv4.vif_table[iter->ct]; |
1da177e4 LT |
1714 | } |
1715 | return NULL; | |
1716 | } | |
1717 | ||
1718 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 1719 | __releases(mrt_lock) |
1da177e4 LT |
1720 | { |
1721 | read_unlock(&mrt_lock); | |
1722 | } | |
1723 | ||
1724 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1725 | { | |
f6bb4514 BT |
1726 | struct net *net = seq_file_net(seq); |
1727 | ||
1da177e4 | 1728 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 1729 | seq_puts(seq, |
1da177e4 LT |
1730 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1731 | } else { | |
1732 | const struct vif_device *vif = v; | |
1733 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1734 | ||
1735 | seq_printf(seq, | |
1736 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
f6bb4514 | 1737 | vif - net->ipv4.vif_table, |
e905a9ed | 1738 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1739 | vif->bytes_out, vif->pkt_out, |
1740 | vif->flags, vif->local, vif->remote); | |
1741 | } | |
1742 | return 0; | |
1743 | } | |
1744 | ||
f690808e | 1745 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1746 | .start = ipmr_vif_seq_start, |
1747 | .next = ipmr_vif_seq_next, | |
1748 | .stop = ipmr_vif_seq_stop, | |
1749 | .show = ipmr_vif_seq_show, | |
1750 | }; | |
1751 | ||
1752 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1753 | { | |
f6bb4514 BT |
1754 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
1755 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
1756 | } |
1757 | ||
9a32144e | 1758 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1759 | .owner = THIS_MODULE, |
1760 | .open = ipmr_vif_open, | |
1761 | .read = seq_read, | |
1762 | .llseek = seq_lseek, | |
f6bb4514 | 1763 | .release = seq_release_net, |
1da177e4 LT |
1764 | }; |
1765 | ||
1766 | struct ipmr_mfc_iter { | |
f6bb4514 | 1767 | struct seq_net_private p; |
1da177e4 LT |
1768 | struct mfc_cache **cache; |
1769 | int ct; | |
1770 | }; | |
1771 | ||
1772 | ||
f6bb4514 BT |
1773 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
1774 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 LT |
1775 | { |
1776 | struct mfc_cache *mfc; | |
1777 | ||
f6bb4514 | 1778 | it->cache = net->ipv4.mfc_cache_array; |
1da177e4 | 1779 | read_lock(&mrt_lock); |
e905a9ed | 1780 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
f6bb4514 | 1781 | for (mfc = net->ipv4.mfc_cache_array[it->ct]; |
2bb8b26c | 1782 | mfc; mfc = mfc->next) |
e905a9ed | 1783 | if (pos-- == 0) |
1da177e4 LT |
1784 | return mfc; |
1785 | read_unlock(&mrt_lock); | |
1786 | ||
1787 | it->cache = &mfc_unres_queue; | |
1788 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1789 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
f6bb4514 BT |
1790 | if (net_eq(mfc_net(mfc), net) && |
1791 | pos-- == 0) | |
1da177e4 LT |
1792 | return mfc; |
1793 | spin_unlock_bh(&mfc_unres_lock); | |
1794 | ||
1795 | it->cache = NULL; | |
1796 | return NULL; | |
1797 | } | |
1798 | ||
1799 | ||
1800 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1801 | { | |
1802 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 BT |
1803 | struct net *net = seq_file_net(seq); |
1804 | ||
1da177e4 LT |
1805 | it->cache = NULL; |
1806 | it->ct = 0; | |
f6bb4514 | 1807 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
1808 | : SEQ_START_TOKEN; |
1809 | } | |
1810 | ||
1811 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1812 | { | |
1813 | struct mfc_cache *mfc = v; | |
1814 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 1815 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1816 | |
1817 | ++*pos; | |
1818 | ||
1819 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 1820 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 LT |
1821 | |
1822 | if (mfc->next) | |
1823 | return mfc->next; | |
e905a9ed YH |
1824 | |
1825 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1826 | goto end_of_list; |
1827 | ||
f6bb4514 | 1828 | BUG_ON(it->cache != net->ipv4.mfc_cache_array); |
1da177e4 LT |
1829 | |
1830 | while (++it->ct < MFC_LINES) { | |
f6bb4514 | 1831 | mfc = net->ipv4.mfc_cache_array[it->ct]; |
1da177e4 LT |
1832 | if (mfc) |
1833 | return mfc; | |
1834 | } | |
1835 | ||
1836 | /* exhausted cache_array, show unresolved */ | |
1837 | read_unlock(&mrt_lock); | |
1838 | it->cache = &mfc_unres_queue; | |
1839 | it->ct = 0; | |
e905a9ed | 1840 | |
1da177e4 LT |
1841 | spin_lock_bh(&mfc_unres_lock); |
1842 | mfc = mfc_unres_queue; | |
f6bb4514 BT |
1843 | while (mfc && !net_eq(mfc_net(mfc), net)) |
1844 | mfc = mfc->next; | |
e905a9ed | 1845 | if (mfc) |
1da177e4 LT |
1846 | return mfc; |
1847 | ||
1848 | end_of_list: | |
1849 | spin_unlock_bh(&mfc_unres_lock); | |
1850 | it->cache = NULL; | |
1851 | ||
1852 | return NULL; | |
1853 | } | |
1854 | ||
1855 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1856 | { | |
1857 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 1858 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1859 | |
1860 | if (it->cache == &mfc_unres_queue) | |
1861 | spin_unlock_bh(&mfc_unres_lock); | |
f6bb4514 | 1862 | else if (it->cache == net->ipv4.mfc_cache_array) |
1da177e4 LT |
1863 | read_unlock(&mrt_lock); |
1864 | } | |
1865 | ||
1866 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1867 | { | |
1868 | int n; | |
f6bb4514 | 1869 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1870 | |
1871 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1872 | seq_puts(seq, |
1da177e4 LT |
1873 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1874 | } else { | |
1875 | const struct mfc_cache *mfc = v; | |
1876 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1877 | |
999890b2 | 1878 | seq_printf(seq, "%08lX %08lX %-3hd", |
1da177e4 LT |
1879 | (unsigned long) mfc->mfc_mcastgrp, |
1880 | (unsigned long) mfc->mfc_origin, | |
1ea472e2 | 1881 | mfc->mfc_parent); |
1da177e4 LT |
1882 | |
1883 | if (it->cache != &mfc_unres_queue) { | |
1ea472e2 BT |
1884 | seq_printf(seq, " %8lu %8lu %8lu", |
1885 | mfc->mfc_un.res.pkt, | |
1886 | mfc->mfc_un.res.bytes, | |
1887 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
1888 | for (n = mfc->mfc_un.res.minvif; |
1889 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
f6bb4514 | 1890 | if (VIF_EXISTS(net, n) && |
cf958ae3 BT |
1891 | mfc->mfc_un.res.ttls[n] < 255) |
1892 | seq_printf(seq, | |
e905a9ed | 1893 | " %2d:%-3d", |
1da177e4 LT |
1894 | n, mfc->mfc_un.res.ttls[n]); |
1895 | } | |
1ea472e2 BT |
1896 | } else { |
1897 | /* unresolved mfc_caches don't contain | |
1898 | * pkt, bytes and wrong_if values | |
1899 | */ | |
1900 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
1901 | } |
1902 | seq_putc(seq, '\n'); | |
1903 | } | |
1904 | return 0; | |
1905 | } | |
1906 | ||
f690808e | 1907 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1908 | .start = ipmr_mfc_seq_start, |
1909 | .next = ipmr_mfc_seq_next, | |
1910 | .stop = ipmr_mfc_seq_stop, | |
1911 | .show = ipmr_mfc_seq_show, | |
1912 | }; | |
1913 | ||
1914 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1915 | { | |
f6bb4514 BT |
1916 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
1917 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
1918 | } |
1919 | ||
9a32144e | 1920 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1921 | .owner = THIS_MODULE, |
1922 | .open = ipmr_mfc_open, | |
1923 | .read = seq_read, | |
1924 | .llseek = seq_lseek, | |
f6bb4514 | 1925 | .release = seq_release_net, |
1da177e4 | 1926 | }; |
e905a9ed | 1927 | #endif |
1da177e4 LT |
1928 | |
1929 | #ifdef CONFIG_IP_PIMSM_V2 | |
1930 | static struct net_protocol pim_protocol = { | |
1931 | .handler = pim_rcv, | |
1932 | }; | |
1933 | #endif | |
1934 | ||
1935 | ||
1936 | /* | |
1937 | * Setup for IP multicast routing | |
1938 | */ | |
cf958ae3 BT |
1939 | static int __net_init ipmr_net_init(struct net *net) |
1940 | { | |
1941 | int err = 0; | |
1942 | ||
1943 | net->ipv4.vif_table = kcalloc(MAXVIFS, sizeof(struct vif_device), | |
1944 | GFP_KERNEL); | |
1945 | if (!net->ipv4.vif_table) { | |
1946 | err = -ENOMEM; | |
1947 | goto fail; | |
1948 | } | |
2bb8b26c BT |
1949 | |
1950 | /* Forwarding cache */ | |
1951 | net->ipv4.mfc_cache_array = kcalloc(MFC_LINES, | |
1952 | sizeof(struct mfc_cache *), | |
1953 | GFP_KERNEL); | |
1954 | if (!net->ipv4.mfc_cache_array) { | |
1955 | err = -ENOMEM; | |
1956 | goto fail_mfc_cache; | |
1957 | } | |
6c5143db BT |
1958 | |
1959 | #ifdef CONFIG_IP_PIMSM | |
1960 | net->ipv4.mroute_reg_vif_num = -1; | |
1961 | #endif | |
f6bb4514 BT |
1962 | |
1963 | #ifdef CONFIG_PROC_FS | |
1964 | err = -ENOMEM; | |
1965 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
1966 | goto proc_vif_fail; | |
1967 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
1968 | goto proc_cache_fail; | |
1969 | #endif | |
2bb8b26c BT |
1970 | return 0; |
1971 | ||
f6bb4514 BT |
1972 | #ifdef CONFIG_PROC_FS |
1973 | proc_cache_fail: | |
1974 | proc_net_remove(net, "ip_mr_vif"); | |
1975 | proc_vif_fail: | |
1976 | kfree(net->ipv4.mfc_cache_array); | |
1977 | #endif | |
2bb8b26c BT |
1978 | fail_mfc_cache: |
1979 | kfree(net->ipv4.vif_table); | |
cf958ae3 BT |
1980 | fail: |
1981 | return err; | |
1982 | } | |
1983 | ||
1984 | static void __net_exit ipmr_net_exit(struct net *net) | |
1985 | { | |
f6bb4514 BT |
1986 | #ifdef CONFIG_PROC_FS |
1987 | proc_net_remove(net, "ip_mr_cache"); | |
1988 | proc_net_remove(net, "ip_mr_vif"); | |
1989 | #endif | |
2bb8b26c | 1990 | kfree(net->ipv4.mfc_cache_array); |
cf958ae3 BT |
1991 | kfree(net->ipv4.vif_table); |
1992 | } | |
1993 | ||
1994 | static struct pernet_operations ipmr_net_ops = { | |
1995 | .init = ipmr_net_init, | |
1996 | .exit = ipmr_net_exit, | |
1997 | }; | |
e905a9ed | 1998 | |
03d2f897 | 1999 | int __init ip_mr_init(void) |
1da177e4 | 2000 | { |
03d2f897 WC |
2001 | int err; |
2002 | ||
1da177e4 LT |
2003 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2004 | sizeof(struct mfc_cache), | |
e5d679f3 | 2005 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2006 | NULL); |
03d2f897 WC |
2007 | if (!mrt_cachep) |
2008 | return -ENOMEM; | |
2009 | ||
cf958ae3 BT |
2010 | err = register_pernet_subsys(&ipmr_net_ops); |
2011 | if (err) | |
2012 | goto reg_pernet_fail; | |
2013 | ||
b24b8a24 | 2014 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
03d2f897 WC |
2015 | err = register_netdevice_notifier(&ip_mr_notifier); |
2016 | if (err) | |
2017 | goto reg_notif_fail; | |
03d2f897 | 2018 | return 0; |
f6bb4514 | 2019 | |
c3e38896 BT |
2020 | reg_notif_fail: |
2021 | del_timer(&ipmr_expire_timer); | |
cf958ae3 BT |
2022 | unregister_pernet_subsys(&ipmr_net_ops); |
2023 | reg_pernet_fail: | |
c3e38896 | 2024 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2025 | return err; |
1da177e4 | 2026 | } |