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 | ||
70 | static struct sock *mroute_socket; | |
71 | ||
72 | ||
73 | /* Big lock, protecting vif table, mrt cache and mroute socket state. | |
74 | Note that the changes are semaphored via rtnl_lock. | |
75 | */ | |
76 | ||
77 | static DEFINE_RWLOCK(mrt_lock); | |
78 | ||
79 | /* | |
80 | * Multicast router control variables | |
81 | */ | |
82 | ||
83 | static struct vif_device vif_table[MAXVIFS]; /* Devices */ | |
84 | static int maxvif; | |
85 | ||
86 | #define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) | |
87 | ||
88 | static int mroute_do_assert; /* Set in PIM assert */ | |
89 | static int mroute_do_pim; | |
90 | ||
91 | static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ | |
92 | ||
93 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ | |
94 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ | |
95 | ||
96 | /* Special spinlock for queue of unresolved entries */ | |
97 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
98 | ||
99 | /* We return to original Alan's scheme. Hash table of resolved | |
100 | entries is changed only in process context and protected | |
101 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
102 | with strong spinlock mfc_unres_lock. | |
103 | ||
104 | In this case data path is free of exclusive locks at all. | |
105 | */ | |
106 | ||
e18b890b | 107 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
108 | |
109 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
110 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
111 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
112 | ||
113 | #ifdef CONFIG_IP_PIMSM_V2 | |
114 | static struct net_protocol pim_protocol; | |
115 | #endif | |
116 | ||
117 | static struct timer_list ipmr_expire_timer; | |
118 | ||
119 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
120 | ||
d607032d WC |
121 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
122 | { | |
123 | dev_close(dev); | |
124 | ||
125 | dev = __dev_get_by_name(&init_net, "tunl0"); | |
126 | if (dev) { | |
127 | struct ifreq ifr; | |
128 | mm_segment_t oldfs; | |
129 | struct ip_tunnel_parm p; | |
130 | ||
131 | memset(&p, 0, sizeof(p)); | |
132 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
133 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
134 | p.iph.version = 4; | |
135 | p.iph.ihl = 5; | |
136 | p.iph.protocol = IPPROTO_IPIP; | |
137 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
138 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
139 | ||
140 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
141 | dev->do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
142 | set_fs(oldfs); | |
143 | } | |
144 | } | |
145 | ||
1da177e4 LT |
146 | static |
147 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
148 | { | |
149 | struct net_device *dev; | |
150 | ||
881d966b | 151 | dev = __dev_get_by_name(&init_net, "tunl0"); |
1da177e4 LT |
152 | |
153 | if (dev) { | |
154 | int err; | |
155 | struct ifreq ifr; | |
156 | mm_segment_t oldfs; | |
157 | struct ip_tunnel_parm p; | |
158 | struct in_device *in_dev; | |
159 | ||
160 | memset(&p, 0, sizeof(p)); | |
161 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
162 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
163 | p.iph.version = 4; | |
164 | p.iph.ihl = 5; | |
165 | p.iph.protocol = IPPROTO_IPIP; | |
166 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 167 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 LT |
168 | |
169 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
170 | err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
171 | set_fs(oldfs); | |
172 | ||
173 | dev = NULL; | |
174 | ||
881d966b | 175 | if (err == 0 && (dev = __dev_get_by_name(&init_net, p.name)) != NULL) { |
1da177e4 LT |
176 | dev->flags |= IFF_MULTICAST; |
177 | ||
e5ed6399 | 178 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 179 | if (in_dev == NULL) |
1da177e4 | 180 | goto failure; |
71e27da9 HX |
181 | |
182 | ipv4_devconf_setall(in_dev); | |
183 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
184 | |
185 | if (dev_open(dev)) | |
186 | goto failure; | |
7dc00c82 | 187 | dev_hold(dev); |
1da177e4 LT |
188 | } |
189 | } | |
190 | return dev; | |
191 | ||
192 | failure: | |
193 | /* allow the register to be completed before unregistering. */ | |
194 | rtnl_unlock(); | |
195 | rtnl_lock(); | |
196 | ||
197 | unregister_netdevice(dev); | |
198 | return NULL; | |
199 | } | |
200 | ||
201 | #ifdef CONFIG_IP_PIMSM | |
202 | ||
203 | static int reg_vif_num = -1; | |
204 | ||
205 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
206 | { | |
207 | read_lock(&mrt_lock); | |
cf3677ae PE |
208 | dev->stats.tx_bytes += skb->len; |
209 | dev->stats.tx_packets++; | |
1da177e4 LT |
210 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); |
211 | read_unlock(&mrt_lock); | |
212 | kfree_skb(skb); | |
213 | return 0; | |
214 | } | |
215 | ||
1da177e4 LT |
216 | static void reg_vif_setup(struct net_device *dev) |
217 | { | |
218 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 219 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 LT |
220 | dev->flags = IFF_NOARP; |
221 | dev->hard_start_xmit = reg_vif_xmit; | |
1da177e4 LT |
222 | dev->destructor = free_netdev; |
223 | } | |
224 | ||
225 | static struct net_device *ipmr_reg_vif(void) | |
226 | { | |
227 | struct net_device *dev; | |
228 | struct in_device *in_dev; | |
229 | ||
cf3677ae | 230 | dev = alloc_netdev(0, "pimreg", reg_vif_setup); |
1da177e4 LT |
231 | |
232 | if (dev == NULL) | |
233 | return NULL; | |
234 | ||
235 | if (register_netdevice(dev)) { | |
236 | free_netdev(dev); | |
237 | return NULL; | |
238 | } | |
239 | dev->iflink = 0; | |
240 | ||
71e27da9 HX |
241 | rcu_read_lock(); |
242 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
243 | rcu_read_unlock(); | |
1da177e4 | 244 | goto failure; |
71e27da9 | 245 | } |
1da177e4 | 246 | |
71e27da9 HX |
247 | ipv4_devconf_setall(in_dev); |
248 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
249 | rcu_read_unlock(); | |
1da177e4 LT |
250 | |
251 | if (dev_open(dev)) | |
252 | goto failure; | |
253 | ||
7dc00c82 WC |
254 | dev_hold(dev); |
255 | ||
1da177e4 LT |
256 | return dev; |
257 | ||
258 | failure: | |
259 | /* allow the register to be completed before unregistering. */ | |
260 | rtnl_unlock(); | |
261 | rtnl_lock(); | |
262 | ||
263 | unregister_netdevice(dev); | |
264 | return NULL; | |
265 | } | |
266 | #endif | |
267 | ||
268 | /* | |
269 | * Delete a VIF entry | |
7dc00c82 | 270 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 271 | */ |
e905a9ed | 272 | |
7dc00c82 | 273 | static int vif_delete(int vifi, int notify) |
1da177e4 LT |
274 | { |
275 | struct vif_device *v; | |
276 | struct net_device *dev; | |
277 | struct in_device *in_dev; | |
278 | ||
279 | if (vifi < 0 || vifi >= maxvif) | |
280 | return -EADDRNOTAVAIL; | |
281 | ||
282 | v = &vif_table[vifi]; | |
283 | ||
284 | write_lock_bh(&mrt_lock); | |
285 | dev = v->dev; | |
286 | v->dev = NULL; | |
287 | ||
288 | if (!dev) { | |
289 | write_unlock_bh(&mrt_lock); | |
290 | return -EADDRNOTAVAIL; | |
291 | } | |
292 | ||
293 | #ifdef CONFIG_IP_PIMSM | |
294 | if (vifi == reg_vif_num) | |
295 | reg_vif_num = -1; | |
296 | #endif | |
297 | ||
298 | if (vifi+1 == maxvif) { | |
299 | int tmp; | |
300 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
301 | if (VIF_EXISTS(tmp)) | |
302 | break; | |
303 | } | |
304 | maxvif = tmp+1; | |
305 | } | |
306 | ||
307 | write_unlock_bh(&mrt_lock); | |
308 | ||
309 | dev_set_allmulti(dev, -1); | |
310 | ||
e5ed6399 | 311 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 312 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
313 | ip_rt_multicast_event(in_dev); |
314 | } | |
315 | ||
7dc00c82 | 316 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
1da177e4 LT |
317 | unregister_netdevice(dev); |
318 | ||
319 | dev_put(dev); | |
320 | return 0; | |
321 | } | |
322 | ||
323 | /* Destroy an unresolved cache entry, killing queued skbs | |
324 | and reporting error to netlink readers. | |
325 | */ | |
326 | ||
327 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
328 | { | |
329 | struct sk_buff *skb; | |
9ef1d4c7 | 330 | struct nlmsgerr *e; |
1da177e4 LT |
331 | |
332 | atomic_dec(&cache_resolve_queue_len); | |
333 | ||
c354e124 | 334 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 335 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
336 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
337 | nlh->nlmsg_type = NLMSG_ERROR; | |
338 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
339 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
340 | e = NLMSG_DATA(nlh); |
341 | e->error = -ETIMEDOUT; | |
342 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 343 | |
97c53cac | 344 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
1da177e4 LT |
345 | } else |
346 | kfree_skb(skb); | |
347 | } | |
348 | ||
349 | kmem_cache_free(mrt_cachep, c); | |
350 | } | |
351 | ||
352 | ||
353 | /* Single timer process for all the unresolved queue. */ | |
354 | ||
355 | static void ipmr_expire_process(unsigned long dummy) | |
356 | { | |
357 | unsigned long now; | |
358 | unsigned long expires; | |
359 | struct mfc_cache *c, **cp; | |
360 | ||
361 | if (!spin_trylock(&mfc_unres_lock)) { | |
362 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
363 | return; | |
364 | } | |
365 | ||
366 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
367 | goto out; | |
368 | ||
369 | now = jiffies; | |
370 | expires = 10*HZ; | |
371 | cp = &mfc_unres_queue; | |
372 | ||
373 | while ((c=*cp) != NULL) { | |
374 | if (time_after(c->mfc_un.unres.expires, now)) { | |
375 | unsigned long interval = c->mfc_un.unres.expires - now; | |
376 | if (interval < expires) | |
377 | expires = interval; | |
378 | cp = &c->next; | |
379 | continue; | |
380 | } | |
381 | ||
382 | *cp = c->next; | |
383 | ||
384 | ipmr_destroy_unres(c); | |
385 | } | |
386 | ||
387 | if (atomic_read(&cache_resolve_queue_len)) | |
388 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
389 | ||
390 | out: | |
391 | spin_unlock(&mfc_unres_lock); | |
392 | } | |
393 | ||
394 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
395 | ||
d1b04c08 | 396 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
397 | { |
398 | int vifi; | |
399 | ||
400 | cache->mfc_un.res.minvif = MAXVIFS; | |
401 | cache->mfc_un.res.maxvif = 0; | |
402 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
403 | ||
404 | for (vifi=0; vifi<maxvif; vifi++) { | |
405 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
406 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
407 | if (cache->mfc_un.res.minvif > vifi) | |
408 | cache->mfc_un.res.minvif = vifi; | |
409 | if (cache->mfc_un.res.maxvif <= vifi) | |
410 | cache->mfc_un.res.maxvif = vifi + 1; | |
411 | } | |
412 | } | |
413 | } | |
414 | ||
415 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
416 | { | |
417 | int vifi = vifc->vifc_vifi; | |
418 | struct vif_device *v = &vif_table[vifi]; | |
419 | struct net_device *dev; | |
420 | struct in_device *in_dev; | |
d607032d | 421 | int err; |
1da177e4 LT |
422 | |
423 | /* Is vif busy ? */ | |
424 | if (VIF_EXISTS(vifi)) | |
425 | return -EADDRINUSE; | |
426 | ||
427 | switch (vifc->vifc_flags) { | |
428 | #ifdef CONFIG_IP_PIMSM | |
429 | case VIFF_REGISTER: | |
430 | /* | |
431 | * Special Purpose VIF in PIM | |
432 | * All the packets will be sent to the daemon | |
433 | */ | |
434 | if (reg_vif_num >= 0) | |
435 | return -EADDRINUSE; | |
436 | dev = ipmr_reg_vif(); | |
437 | if (!dev) | |
438 | return -ENOBUFS; | |
d607032d WC |
439 | err = dev_set_allmulti(dev, 1); |
440 | if (err) { | |
441 | unregister_netdevice(dev); | |
7dc00c82 | 442 | dev_put(dev); |
d607032d WC |
443 | return err; |
444 | } | |
1da177e4 LT |
445 | break; |
446 | #endif | |
e905a9ed | 447 | case VIFF_TUNNEL: |
1da177e4 LT |
448 | dev = ipmr_new_tunnel(vifc); |
449 | if (!dev) | |
450 | return -ENOBUFS; | |
d607032d WC |
451 | err = dev_set_allmulti(dev, 1); |
452 | if (err) { | |
453 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 454 | dev_put(dev); |
d607032d WC |
455 | return err; |
456 | } | |
1da177e4 LT |
457 | break; |
458 | case 0: | |
1ab35276 | 459 | dev = ip_dev_find(&init_net, vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
460 | if (!dev) |
461 | return -EADDRNOTAVAIL; | |
d607032d | 462 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
463 | if (err) { |
464 | dev_put(dev); | |
d607032d | 465 | return err; |
7dc00c82 | 466 | } |
1da177e4 LT |
467 | break; |
468 | default: | |
469 | return -EINVAL; | |
470 | } | |
471 | ||
e5ed6399 | 472 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 | 473 | return -EADDRNOTAVAIL; |
42f811b8 | 474 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
475 | ip_rt_multicast_event(in_dev); |
476 | ||
477 | /* | |
478 | * Fill in the VIF structures | |
479 | */ | |
c354e124 JK |
480 | v->rate_limit = vifc->vifc_rate_limit; |
481 | v->local = vifc->vifc_lcl_addr.s_addr; | |
482 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
483 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
484 | if (!mrtsock) |
485 | v->flags |= VIFF_STATIC; | |
c354e124 | 486 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
487 | v->bytes_in = 0; |
488 | v->bytes_out = 0; | |
489 | v->pkt_in = 0; | |
490 | v->pkt_out = 0; | |
491 | v->link = dev->ifindex; | |
492 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
493 | v->link = dev->iflink; | |
494 | ||
495 | /* And finish update writing critical data */ | |
496 | write_lock_bh(&mrt_lock); | |
c354e124 | 497 | v->dev = dev; |
1da177e4 LT |
498 | #ifdef CONFIG_IP_PIMSM |
499 | if (v->flags&VIFF_REGISTER) | |
500 | reg_vif_num = vifi; | |
501 | #endif | |
502 | if (vifi+1 > maxvif) | |
503 | maxvif = vifi+1; | |
504 | write_unlock_bh(&mrt_lock); | |
505 | return 0; | |
506 | } | |
507 | ||
114c7844 | 508 | static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp) |
1da177e4 | 509 | { |
c354e124 | 510 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
511 | struct mfc_cache *c; |
512 | ||
513 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
514 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
515 | break; | |
516 | } | |
517 | return c; | |
518 | } | |
519 | ||
520 | /* | |
521 | * Allocate a multicast cache entry | |
522 | */ | |
523 | static struct mfc_cache *ipmr_cache_alloc(void) | |
524 | { | |
c354e124 JK |
525 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
526 | if (c == NULL) | |
1da177e4 | 527 | return NULL; |
1da177e4 LT |
528 | c->mfc_un.res.minvif = MAXVIFS; |
529 | return c; | |
530 | } | |
531 | ||
532 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
533 | { | |
c354e124 JK |
534 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
535 | if (c == NULL) | |
1da177e4 | 536 | return NULL; |
1da177e4 LT |
537 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
538 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
539 | return c; | |
540 | } | |
541 | ||
542 | /* | |
543 | * A cache entry has gone into a resolved state from queued | |
544 | */ | |
e905a9ed | 545 | |
1da177e4 LT |
546 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
547 | { | |
548 | struct sk_buff *skb; | |
9ef1d4c7 | 549 | struct nlmsgerr *e; |
1da177e4 LT |
550 | |
551 | /* | |
552 | * Play the pending entries through our router | |
553 | */ | |
554 | ||
c354e124 | 555 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 556 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
557 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
558 | ||
559 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
560 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
561 | (u8 *)nlh); | |
1da177e4 LT |
562 | } else { |
563 | nlh->nlmsg_type = NLMSG_ERROR; | |
564 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
565 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
566 | e = NLMSG_DATA(nlh); |
567 | e->error = -EMSGSIZE; | |
568 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 569 | } |
2942e900 | 570 | |
97c53cac | 571 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
1da177e4 LT |
572 | } else |
573 | ip_mr_forward(skb, c, 0); | |
574 | } | |
575 | } | |
576 | ||
577 | /* | |
578 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
579 | * expects the following bizarre scheme. | |
580 | * | |
581 | * Called under mrt_lock. | |
582 | */ | |
e905a9ed | 583 | |
1da177e4 LT |
584 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
585 | { | |
586 | struct sk_buff *skb; | |
c9bdd4b5 | 587 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
588 | struct igmphdr *igmp; |
589 | struct igmpmsg *msg; | |
590 | int ret; | |
591 | ||
592 | #ifdef CONFIG_IP_PIMSM | |
593 | if (assert == IGMPMSG_WHOLEPKT) | |
594 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
595 | else | |
596 | #endif | |
597 | skb = alloc_skb(128, GFP_ATOMIC); | |
598 | ||
132adf54 | 599 | if (!skb) |
1da177e4 LT |
600 | return -ENOBUFS; |
601 | ||
602 | #ifdef CONFIG_IP_PIMSM | |
603 | if (assert == IGMPMSG_WHOLEPKT) { | |
604 | /* Ugly, but we have no choice with this interface. | |
605 | Duplicate old header, fix ihl, length etc. | |
606 | And all this only to mangle msg->im_msgtype and | |
607 | to set msg->im_mbz to "mbz" :-) | |
608 | */ | |
878c8145 ACM |
609 | skb_push(skb, sizeof(struct iphdr)); |
610 | skb_reset_network_header(skb); | |
badff6d0 | 611 | skb_reset_transport_header(skb); |
0272ffc4 | 612 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 613 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
614 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
615 | msg->im_mbz = 0; | |
e905a9ed | 616 | msg->im_vif = reg_vif_num; |
eddc9ec5 ACM |
617 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
618 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
619 | sizeof(struct iphdr)); | |
e905a9ed | 620 | } else |
1da177e4 | 621 | #endif |
e905a9ed YH |
622 | { |
623 | ||
1da177e4 LT |
624 | /* |
625 | * Copy the IP header | |
626 | */ | |
627 | ||
27a884dc | 628 | skb->network_header = skb->tail; |
ddc7b8e3 | 629 | skb_put(skb, ihl); |
27d7ff46 | 630 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
631 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
632 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
633 | msg->im_vif = vifi; |
634 | skb->dst = dst_clone(pkt->dst); | |
635 | ||
636 | /* | |
637 | * Add our header | |
638 | */ | |
639 | ||
c354e124 | 640 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
641 | igmp->type = |
642 | msg->im_msgtype = assert; | |
643 | igmp->code = 0; | |
eddc9ec5 | 644 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 645 | skb->transport_header = skb->network_header; |
e905a9ed | 646 | } |
1da177e4 LT |
647 | |
648 | if (mroute_socket == NULL) { | |
649 | kfree_skb(skb); | |
650 | return -EINVAL; | |
651 | } | |
652 | ||
653 | /* | |
654 | * Deliver to mrouted | |
655 | */ | |
c354e124 | 656 | if ((ret = sock_queue_rcv_skb(mroute_socket, skb))<0) { |
1da177e4 LT |
657 | if (net_ratelimit()) |
658 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
659 | kfree_skb(skb); | |
660 | } | |
661 | ||
662 | return ret; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Queue a packet for resolution. It gets locked cache entry! | |
667 | */ | |
e905a9ed | 668 | |
1da177e4 LT |
669 | static int |
670 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
671 | { | |
672 | int err; | |
673 | struct mfc_cache *c; | |
eddc9ec5 | 674 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
675 | |
676 | spin_lock_bh(&mfc_unres_lock); | |
677 | for (c=mfc_unres_queue; c; c=c->next) { | |
eddc9ec5 ACM |
678 | if (c->mfc_mcastgrp == iph->daddr && |
679 | c->mfc_origin == iph->saddr) | |
1da177e4 LT |
680 | break; |
681 | } | |
682 | ||
683 | if (c == NULL) { | |
684 | /* | |
685 | * Create a new entry if allowable | |
686 | */ | |
687 | ||
c354e124 | 688 | if (atomic_read(&cache_resolve_queue_len) >= 10 || |
1da177e4 LT |
689 | (c=ipmr_cache_alloc_unres())==NULL) { |
690 | spin_unlock_bh(&mfc_unres_lock); | |
691 | ||
692 | kfree_skb(skb); | |
693 | return -ENOBUFS; | |
694 | } | |
695 | ||
696 | /* | |
697 | * Fill in the new cache entry | |
698 | */ | |
eddc9ec5 ACM |
699 | c->mfc_parent = -1; |
700 | c->mfc_origin = iph->saddr; | |
701 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
702 | |
703 | /* | |
704 | * Reflect first query at mrouted. | |
705 | */ | |
706 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
e905a9ed | 707 | /* If the report failed throw the cache entry |
1da177e4 LT |
708 | out - Brad Parker |
709 | */ | |
710 | spin_unlock_bh(&mfc_unres_lock); | |
711 | ||
712 | kmem_cache_free(mrt_cachep, c); | |
713 | kfree_skb(skb); | |
714 | return err; | |
715 | } | |
716 | ||
717 | atomic_inc(&cache_resolve_queue_len); | |
718 | c->next = mfc_unres_queue; | |
719 | mfc_unres_queue = c; | |
720 | ||
721 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
722 | } | |
723 | ||
724 | /* | |
725 | * See if we can append the packet | |
726 | */ | |
727 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
728 | kfree_skb(skb); | |
729 | err = -ENOBUFS; | |
730 | } else { | |
c354e124 | 731 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
732 | err = 0; |
733 | } | |
734 | ||
735 | spin_unlock_bh(&mfc_unres_lock); | |
736 | return err; | |
737 | } | |
738 | ||
739 | /* | |
740 | * MFC cache manipulation by user space mroute daemon | |
741 | */ | |
742 | ||
743 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
744 | { | |
745 | int line; | |
746 | struct mfc_cache *c, **cp; | |
747 | ||
c354e124 | 748 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 LT |
749 | |
750 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
751 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
752 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
753 | write_lock_bh(&mrt_lock); | |
754 | *cp = c->next; | |
755 | write_unlock_bh(&mrt_lock); | |
756 | ||
757 | kmem_cache_free(mrt_cachep, c); | |
758 | return 0; | |
759 | } | |
760 | } | |
761 | return -ENOENT; | |
762 | } | |
763 | ||
764 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
765 | { | |
766 | int line; | |
767 | struct mfc_cache *uc, *c, **cp; | |
768 | ||
c354e124 | 769 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 LT |
770 | |
771 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
772 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
773 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
774 | break; | |
775 | } | |
776 | ||
777 | if (c != NULL) { | |
778 | write_lock_bh(&mrt_lock); | |
779 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 780 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
781 | if (!mrtsock) |
782 | c->mfc_flags |= MFC_STATIC; | |
783 | write_unlock_bh(&mrt_lock); | |
784 | return 0; | |
785 | } | |
786 | ||
f97c1e0c | 787 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
788 | return -EINVAL; |
789 | ||
c354e124 JK |
790 | c = ipmr_cache_alloc(); |
791 | if (c == NULL) | |
1da177e4 LT |
792 | return -ENOMEM; |
793 | ||
c354e124 JK |
794 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
795 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
796 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 797 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
798 | if (!mrtsock) |
799 | c->mfc_flags |= MFC_STATIC; | |
800 | ||
801 | write_lock_bh(&mrt_lock); | |
802 | c->next = mfc_cache_array[line]; | |
803 | mfc_cache_array[line] = c; | |
804 | write_unlock_bh(&mrt_lock); | |
805 | ||
806 | /* | |
807 | * Check to see if we resolved a queued list. If so we | |
808 | * need to send on the frames and tidy up. | |
809 | */ | |
810 | spin_lock_bh(&mfc_unres_lock); | |
811 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
812 | cp = &uc->next) { | |
813 | if (uc->mfc_origin == c->mfc_origin && | |
814 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
815 | *cp = uc->next; | |
816 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
817 | del_timer(&ipmr_expire_timer); | |
818 | break; | |
819 | } | |
820 | } | |
821 | spin_unlock_bh(&mfc_unres_lock); | |
822 | ||
823 | if (uc) { | |
824 | ipmr_cache_resolve(uc, c); | |
825 | kmem_cache_free(mrt_cachep, uc); | |
826 | } | |
827 | return 0; | |
828 | } | |
829 | ||
830 | /* | |
831 | * Close the multicast socket, and clear the vif tables etc | |
832 | */ | |
e905a9ed | 833 | |
1da177e4 LT |
834 | static void mroute_clean_tables(struct sock *sk) |
835 | { | |
836 | int i; | |
e905a9ed | 837 | |
1da177e4 LT |
838 | /* |
839 | * Shut down all active vif entries | |
840 | */ | |
132adf54 | 841 | for (i=0; i<maxvif; i++) { |
1da177e4 | 842 | if (!(vif_table[i].flags&VIFF_STATIC)) |
7dc00c82 | 843 | vif_delete(i, 0); |
1da177e4 LT |
844 | } |
845 | ||
846 | /* | |
847 | * Wipe the cache | |
848 | */ | |
c354e124 | 849 | for (i=0; i<MFC_LINES; i++) { |
1da177e4 LT |
850 | struct mfc_cache *c, **cp; |
851 | ||
852 | cp = &mfc_cache_array[i]; | |
853 | while ((c = *cp) != NULL) { | |
854 | if (c->mfc_flags&MFC_STATIC) { | |
855 | cp = &c->next; | |
856 | continue; | |
857 | } | |
858 | write_lock_bh(&mrt_lock); | |
859 | *cp = c->next; | |
860 | write_unlock_bh(&mrt_lock); | |
861 | ||
862 | kmem_cache_free(mrt_cachep, c); | |
863 | } | |
864 | } | |
865 | ||
866 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
867 | struct mfc_cache *c; | |
868 | ||
869 | spin_lock_bh(&mfc_unres_lock); | |
870 | while (mfc_unres_queue != NULL) { | |
871 | c = mfc_unres_queue; | |
872 | mfc_unres_queue = c->next; | |
873 | spin_unlock_bh(&mfc_unres_lock); | |
874 | ||
875 | ipmr_destroy_unres(c); | |
876 | ||
877 | spin_lock_bh(&mfc_unres_lock); | |
878 | } | |
879 | spin_unlock_bh(&mfc_unres_lock); | |
880 | } | |
881 | } | |
882 | ||
883 | static void mrtsock_destruct(struct sock *sk) | |
884 | { | |
885 | rtnl_lock(); | |
886 | if (sk == mroute_socket) { | |
3b1e0a65 | 887 | IPV4_DEVCONF_ALL(sock_net(sk), MC_FORWARDING)--; |
1da177e4 LT |
888 | |
889 | write_lock_bh(&mrt_lock); | |
c354e124 | 890 | mroute_socket = NULL; |
1da177e4 LT |
891 | write_unlock_bh(&mrt_lock); |
892 | ||
893 | mroute_clean_tables(sk); | |
894 | } | |
895 | rtnl_unlock(); | |
896 | } | |
897 | ||
898 | /* | |
899 | * Socket options and virtual interface manipulation. The whole | |
900 | * virtual interface system is a complete heap, but unfortunately | |
901 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
902 | * MOSPF/PIM router set up we can clean this up. | |
903 | */ | |
e905a9ed | 904 | |
c354e124 | 905 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) |
1da177e4 LT |
906 | { |
907 | int ret; | |
908 | struct vifctl vif; | |
909 | struct mfcctl mfc; | |
e905a9ed | 910 | |
132adf54 SH |
911 | if (optname != MRT_INIT) { |
912 | if (sk != mroute_socket && !capable(CAP_NET_ADMIN)) | |
1da177e4 LT |
913 | return -EACCES; |
914 | } | |
915 | ||
132adf54 SH |
916 | switch (optname) { |
917 | case MRT_INIT: | |
918 | if (sk->sk_type != SOCK_RAW || | |
919 | inet_sk(sk)->num != IPPROTO_IGMP) | |
920 | return -EOPNOTSUPP; | |
c354e124 | 921 | if (optlen != sizeof(int)) |
132adf54 | 922 | return -ENOPROTOOPT; |
1da177e4 | 923 | |
132adf54 SH |
924 | rtnl_lock(); |
925 | if (mroute_socket) { | |
1da177e4 | 926 | rtnl_unlock(); |
132adf54 SH |
927 | return -EADDRINUSE; |
928 | } | |
929 | ||
930 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
931 | if (ret == 0) { | |
932 | write_lock_bh(&mrt_lock); | |
c354e124 | 933 | mroute_socket = sk; |
132adf54 SH |
934 | write_unlock_bh(&mrt_lock); |
935 | ||
3b1e0a65 | 936 | IPV4_DEVCONF_ALL(sock_net(sk), MC_FORWARDING)++; |
132adf54 SH |
937 | } |
938 | rtnl_unlock(); | |
939 | return ret; | |
940 | case MRT_DONE: | |
c354e124 | 941 | if (sk != mroute_socket) |
132adf54 SH |
942 | return -EACCES; |
943 | return ip_ra_control(sk, 0, NULL); | |
944 | case MRT_ADD_VIF: | |
945 | case MRT_DEL_VIF: | |
c354e124 | 946 | if (optlen != sizeof(vif)) |
132adf54 | 947 | return -EINVAL; |
c354e124 | 948 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
949 | return -EFAULT; |
950 | if (vif.vifc_vifi >= MAXVIFS) | |
951 | return -ENFILE; | |
952 | rtnl_lock(); | |
c354e124 | 953 | if (optname == MRT_ADD_VIF) { |
132adf54 SH |
954 | ret = vif_add(&vif, sk==mroute_socket); |
955 | } else { | |
7dc00c82 | 956 | ret = vif_delete(vif.vifc_vifi, 0); |
132adf54 SH |
957 | } |
958 | rtnl_unlock(); | |
959 | return ret; | |
1da177e4 LT |
960 | |
961 | /* | |
962 | * Manipulate the forwarding caches. These live | |
963 | * in a sort of kernel/user symbiosis. | |
964 | */ | |
132adf54 SH |
965 | case MRT_ADD_MFC: |
966 | case MRT_DEL_MFC: | |
c354e124 | 967 | if (optlen != sizeof(mfc)) |
132adf54 | 968 | return -EINVAL; |
c354e124 | 969 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
970 | return -EFAULT; |
971 | rtnl_lock(); | |
c354e124 | 972 | if (optname == MRT_DEL_MFC) |
132adf54 SH |
973 | ret = ipmr_mfc_delete(&mfc); |
974 | else | |
975 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); | |
976 | rtnl_unlock(); | |
977 | return ret; | |
1da177e4 LT |
978 | /* |
979 | * Control PIM assert. | |
980 | */ | |
132adf54 SH |
981 | case MRT_ASSERT: |
982 | { | |
983 | int v; | |
984 | if (get_user(v,(int __user *)optval)) | |
985 | return -EFAULT; | |
986 | mroute_do_assert=(v)?1:0; | |
987 | return 0; | |
988 | } | |
1da177e4 | 989 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
990 | case MRT_PIM: |
991 | { | |
ba93ef74 SH |
992 | int v; |
993 | ||
132adf54 SH |
994 | if (get_user(v,(int __user *)optval)) |
995 | return -EFAULT; | |
ba93ef74 SH |
996 | v = (v) ? 1 : 0; |
997 | ||
132adf54 SH |
998 | rtnl_lock(); |
999 | ret = 0; | |
1000 | if (v != mroute_do_pim) { | |
1001 | mroute_do_pim = v; | |
1002 | mroute_do_assert = v; | |
1da177e4 | 1003 | #ifdef CONFIG_IP_PIMSM_V2 |
132adf54 SH |
1004 | if (mroute_do_pim) |
1005 | ret = inet_add_protocol(&pim_protocol, | |
1006 | IPPROTO_PIM); | |
1007 | else | |
1008 | ret = inet_del_protocol(&pim_protocol, | |
1009 | IPPROTO_PIM); | |
1010 | if (ret < 0) | |
1011 | ret = -EAGAIN; | |
1da177e4 | 1012 | #endif |
1da177e4 | 1013 | } |
132adf54 SH |
1014 | rtnl_unlock(); |
1015 | return ret; | |
1016 | } | |
1da177e4 | 1017 | #endif |
132adf54 SH |
1018 | /* |
1019 | * Spurious command, or MRT_VERSION which you cannot | |
1020 | * set. | |
1021 | */ | |
1022 | default: | |
1023 | return -ENOPROTOOPT; | |
1da177e4 LT |
1024 | } |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * Getsock opt support for the multicast routing system. | |
1029 | */ | |
e905a9ed | 1030 | |
c354e124 | 1031 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1032 | { |
1033 | int olr; | |
1034 | int val; | |
1035 | ||
c354e124 | 1036 | if (optname != MRT_VERSION && |
1da177e4 LT |
1037 | #ifdef CONFIG_IP_PIMSM |
1038 | optname!=MRT_PIM && | |
1039 | #endif | |
1040 | optname!=MRT_ASSERT) | |
1041 | return -ENOPROTOOPT; | |
1042 | ||
1043 | if (get_user(olr, optlen)) | |
1044 | return -EFAULT; | |
1045 | ||
1046 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1047 | if (olr < 0) | |
1048 | return -EINVAL; | |
e905a9ed | 1049 | |
c354e124 | 1050 | if (put_user(olr, optlen)) |
1da177e4 | 1051 | return -EFAULT; |
c354e124 JK |
1052 | if (optname == MRT_VERSION) |
1053 | val = 0x0305; | |
1da177e4 | 1054 | #ifdef CONFIG_IP_PIMSM |
c354e124 JK |
1055 | else if (optname == MRT_PIM) |
1056 | val = mroute_do_pim; | |
1da177e4 LT |
1057 | #endif |
1058 | else | |
c354e124 JK |
1059 | val = mroute_do_assert; |
1060 | if (copy_to_user(optval, &val, olr)) | |
1da177e4 LT |
1061 | return -EFAULT; |
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * The IP multicast ioctl support routines. | |
1067 | */ | |
e905a9ed | 1068 | |
1da177e4 LT |
1069 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1070 | { | |
1071 | struct sioc_sg_req sr; | |
1072 | struct sioc_vif_req vr; | |
1073 | struct vif_device *vif; | |
1074 | struct mfc_cache *c; | |
e905a9ed | 1075 | |
132adf54 SH |
1076 | switch (cmd) { |
1077 | case SIOCGETVIFCNT: | |
c354e124 | 1078 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1079 | return -EFAULT; |
c354e124 | 1080 | if (vr.vifi >= maxvif) |
132adf54 SH |
1081 | return -EINVAL; |
1082 | read_lock(&mrt_lock); | |
1083 | vif=&vif_table[vr.vifi]; | |
1084 | if (VIF_EXISTS(vr.vifi)) { | |
c354e124 JK |
1085 | vr.icount = vif->pkt_in; |
1086 | vr.ocount = vif->pkt_out; | |
1087 | vr.ibytes = vif->bytes_in; | |
1088 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1089 | read_unlock(&mrt_lock); |
1da177e4 | 1090 | |
c354e124 | 1091 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1092 | return -EFAULT; |
1093 | return 0; | |
1094 | } | |
1095 | read_unlock(&mrt_lock); | |
1096 | return -EADDRNOTAVAIL; | |
1097 | case SIOCGETSGCNT: | |
c354e124 | 1098 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1099 | return -EFAULT; |
1100 | ||
1101 | read_lock(&mrt_lock); | |
1102 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1103 | if (c) { | |
1104 | sr.pktcnt = c->mfc_un.res.pkt; | |
1105 | sr.bytecnt = c->mfc_un.res.bytes; | |
1106 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1107 | read_unlock(&mrt_lock); |
132adf54 | 1108 | |
c354e124 | 1109 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1110 | return -EFAULT; |
1111 | return 0; | |
1112 | } | |
1113 | read_unlock(&mrt_lock); | |
1114 | return -EADDRNOTAVAIL; | |
1115 | default: | |
1116 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1117 | } |
1118 | } | |
1119 | ||
1120 | ||
1121 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1122 | { | |
e9dc8653 | 1123 | struct net_device *dev = ptr; |
1da177e4 LT |
1124 | struct vif_device *v; |
1125 | int ct; | |
e9dc8653 | 1126 | |
721499e8 | 1127 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
1128 | return NOTIFY_DONE; |
1129 | ||
1da177e4 LT |
1130 | if (event != NETDEV_UNREGISTER) |
1131 | return NOTIFY_DONE; | |
1132 | v=&vif_table[0]; | |
c354e124 JK |
1133 | for (ct=0; ct<maxvif; ct++,v++) { |
1134 | if (v->dev == dev) | |
7dc00c82 | 1135 | vif_delete(ct, 1); |
1da177e4 LT |
1136 | } |
1137 | return NOTIFY_DONE; | |
1138 | } | |
1139 | ||
1140 | ||
c354e124 | 1141 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1142 | .notifier_call = ipmr_device_event, |
1143 | }; | |
1144 | ||
1145 | /* | |
1146 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1147 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1148 | * important for multicast video. | |
1149 | */ | |
e905a9ed | 1150 | |
114c7844 | 1151 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1152 | { |
8856dfa3 | 1153 | struct iphdr *iph; |
eddc9ec5 | 1154 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1155 | |
1156 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1157 | skb->transport_header = skb->network_header; |
8856dfa3 | 1158 | skb_reset_network_header(skb); |
eddc9ec5 | 1159 | iph = ip_hdr(skb); |
1da177e4 LT |
1160 | |
1161 | iph->version = 4; | |
e023dd64 ACM |
1162 | iph->tos = old_iph->tos; |
1163 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1164 | iph->frag_off = 0; |
1165 | iph->daddr = daddr; | |
1166 | iph->saddr = saddr; | |
1167 | iph->protocol = IPPROTO_IPIP; | |
1168 | iph->ihl = 5; | |
1169 | iph->tot_len = htons(skb->len); | |
1170 | ip_select_ident(iph, skb->dst, NULL); | |
1171 | ip_send_check(iph); | |
1172 | ||
1da177e4 LT |
1173 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1174 | nf_reset(skb); | |
1175 | } | |
1176 | ||
1177 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1178 | { | |
1179 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1180 | ||
7c73a6fa | 1181 | IP_INC_STATS_BH(dev_net(skb->dst->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1182 | |
1183 | if (unlikely(opt->optlen)) | |
1184 | ip_forward_options(skb); | |
1185 | ||
1186 | return dst_output(skb); | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Processing handlers for ipmr_forward | |
1191 | */ | |
1192 | ||
1193 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1194 | { | |
eddc9ec5 | 1195 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1196 | struct vif_device *vif = &vif_table[vifi]; |
1197 | struct net_device *dev; | |
1198 | struct rtable *rt; | |
1199 | int encap = 0; | |
1200 | ||
1201 | if (vif->dev == NULL) | |
1202 | goto out_free; | |
1203 | ||
1204 | #ifdef CONFIG_IP_PIMSM | |
1205 | if (vif->flags & VIFF_REGISTER) { | |
1206 | vif->pkt_out++; | |
c354e124 | 1207 | vif->bytes_out += skb->len; |
cf3677ae PE |
1208 | vif->dev->stats.tx_bytes += skb->len; |
1209 | vif->dev->stats.tx_packets++; | |
1da177e4 LT |
1210 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
1211 | kfree_skb(skb); | |
1212 | return; | |
1213 | } | |
1214 | #endif | |
1215 | ||
1216 | if (vif->flags&VIFF_TUNNEL) { | |
1217 | struct flowi fl = { .oif = vif->link, | |
1218 | .nl_u = { .ip4_u = | |
1219 | { .daddr = vif->remote, | |
1220 | .saddr = vif->local, | |
1221 | .tos = RT_TOS(iph->tos) } }, | |
1222 | .proto = IPPROTO_IPIP }; | |
f206351a | 1223 | if (ip_route_output_key(&init_net, &rt, &fl)) |
1da177e4 LT |
1224 | goto out_free; |
1225 | encap = sizeof(struct iphdr); | |
1226 | } else { | |
1227 | struct flowi fl = { .oif = vif->link, | |
1228 | .nl_u = { .ip4_u = | |
1229 | { .daddr = iph->daddr, | |
1230 | .tos = RT_TOS(iph->tos) } }, | |
1231 | .proto = IPPROTO_IPIP }; | |
f206351a | 1232 | if (ip_route_output_key(&init_net, &rt, &fl)) |
1da177e4 LT |
1233 | goto out_free; |
1234 | } | |
1235 | ||
1236 | dev = rt->u.dst.dev; | |
1237 | ||
1238 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1239 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1240 | allow to send ICMP, so that packets will disappear | |
1241 | to blackhole. | |
1242 | */ | |
1243 | ||
7c73a6fa | 1244 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1245 | ip_rt_put(rt); |
1246 | goto out_free; | |
1247 | } | |
1248 | ||
1249 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1250 | ||
1251 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1252 | ip_rt_put(rt); |
1da177e4 LT |
1253 | goto out_free; |
1254 | } | |
1255 | ||
1256 | vif->pkt_out++; | |
c354e124 | 1257 | vif->bytes_out += skb->len; |
1da177e4 LT |
1258 | |
1259 | dst_release(skb->dst); | |
1260 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1261 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1262 | |
1263 | /* FIXME: forward and output firewalls used to be called here. | |
1264 | * What do we do with netfilter? -- RR */ | |
1265 | if (vif->flags & VIFF_TUNNEL) { | |
1266 | ip_encap(skb, vif->local, vif->remote); | |
1267 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1268 | vif->dev->stats.tx_packets++; |
1269 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1273 | ||
1274 | /* | |
1275 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1276 | * not only before forwarding, but after forwarding on all output | |
1277 | * interfaces. It is clear, if mrouter runs a multicasting | |
1278 | * program, it should receive packets not depending to what interface | |
1279 | * program is joined. | |
1280 | * If we will not make it, the program will have to join on all | |
1281 | * interfaces. On the other hand, multihoming host (or router, but | |
1282 | * not mrouter) cannot join to more than one interface - it will | |
1283 | * result in receiving multiple packets. | |
1284 | */ | |
6e23ae2a | 1285 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1286 | ipmr_forward_finish); |
1287 | return; | |
1288 | ||
1289 | out_free: | |
1290 | kfree_skb(skb); | |
1291 | return; | |
1292 | } | |
1293 | ||
1294 | static int ipmr_find_vif(struct net_device *dev) | |
1295 | { | |
1296 | int ct; | |
1297 | for (ct=maxvif-1; ct>=0; ct--) { | |
1298 | if (vif_table[ct].dev == dev) | |
1299 | break; | |
1300 | } | |
1301 | return ct; | |
1302 | } | |
1303 | ||
1304 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1305 | ||
1306 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1307 | { | |
1308 | int psend = -1; | |
1309 | int vif, ct; | |
1310 | ||
1311 | vif = cache->mfc_parent; | |
1312 | cache->mfc_un.res.pkt++; | |
1313 | cache->mfc_un.res.bytes += skb->len; | |
1314 | ||
1315 | /* | |
1316 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1317 | */ | |
1318 | if (vif_table[vif].dev != skb->dev) { | |
1319 | int true_vifi; | |
1320 | ||
ee6b9673 | 1321 | if (skb->rtable->fl.iif == 0) { |
1da177e4 LT |
1322 | /* It is our own packet, looped back. |
1323 | Very complicated situation... | |
1324 | ||
1325 | The best workaround until routing daemons will be | |
1326 | fixed is not to redistribute packet, if it was | |
1327 | send through wrong interface. It means, that | |
1328 | multicast applications WILL NOT work for | |
1329 | (S,G), which have default multicast route pointing | |
1330 | to wrong oif. In any case, it is not a good | |
1331 | idea to use multicasting applications on router. | |
1332 | */ | |
1333 | goto dont_forward; | |
1334 | } | |
1335 | ||
1336 | cache->mfc_un.res.wrong_if++; | |
1337 | true_vifi = ipmr_find_vif(skb->dev); | |
1338 | ||
1339 | if (true_vifi >= 0 && mroute_do_assert && | |
1340 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1341 | so that we cannot check that packet arrived on an oif. | |
1342 | It is bad, but otherwise we would need to move pretty | |
1343 | large chunk of pimd to kernel. Ough... --ANK | |
1344 | */ | |
1345 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
e905a9ed | 1346 | time_after(jiffies, |
1da177e4 LT |
1347 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1348 | cache->mfc_un.res.last_assert = jiffies; | |
1349 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1350 | } | |
1351 | goto dont_forward; | |
1352 | } | |
1353 | ||
1354 | vif_table[vif].pkt_in++; | |
c354e124 | 1355 | vif_table[vif].bytes_in += skb->len; |
1da177e4 LT |
1356 | |
1357 | /* | |
1358 | * Forward the frame | |
1359 | */ | |
1360 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1361 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1362 | if (psend != -1) { |
1363 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1364 | if (skb2) | |
1365 | ipmr_queue_xmit(skb2, cache, psend); | |
1366 | } | |
c354e124 | 1367 | psend = ct; |
1da177e4 LT |
1368 | } |
1369 | } | |
1370 | if (psend != -1) { | |
1371 | if (local) { | |
1372 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1373 | if (skb2) | |
1374 | ipmr_queue_xmit(skb2, cache, psend); | |
1375 | } else { | |
1376 | ipmr_queue_xmit(skb, cache, psend); | |
1377 | return 0; | |
1378 | } | |
1379 | } | |
1380 | ||
1381 | dont_forward: | |
1382 | if (!local) | |
1383 | kfree_skb(skb); | |
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | ||
1388 | /* | |
1389 | * Multicast packets for forwarding arrive here | |
1390 | */ | |
1391 | ||
1392 | int ip_mr_input(struct sk_buff *skb) | |
1393 | { | |
1394 | struct mfc_cache *cache; | |
ee6b9673 | 1395 | int local = skb->rtable->rt_flags&RTCF_LOCAL; |
1da177e4 LT |
1396 | |
1397 | /* Packet is looped back after forward, it should not be | |
1398 | forwarded second time, but still can be delivered locally. | |
1399 | */ | |
1400 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1401 | goto dont_forward; | |
1402 | ||
1403 | if (!local) { | |
1404 | if (IPCB(skb)->opt.router_alert) { | |
1405 | if (ip_call_ra_chain(skb)) | |
1406 | return 0; | |
eddc9ec5 | 1407 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1408 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1409 | Cisco IOS <= 11.2(8)) do not put router alert | |
1410 | option to IGMP packets destined to routable | |
1411 | groups. It is very bad, because it means | |
1412 | that we can forward NO IGMP messages. | |
1413 | */ | |
1414 | read_lock(&mrt_lock); | |
1415 | if (mroute_socket) { | |
2715bcf9 | 1416 | nf_reset(skb); |
1da177e4 LT |
1417 | raw_rcv(mroute_socket, skb); |
1418 | read_unlock(&mrt_lock); | |
1419 | return 0; | |
1420 | } | |
1421 | read_unlock(&mrt_lock); | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | read_lock(&mrt_lock); | |
eddc9ec5 | 1426 | cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1427 | |
1428 | /* | |
1429 | * No usable cache entry | |
1430 | */ | |
c354e124 | 1431 | if (cache == NULL) { |
1da177e4 LT |
1432 | int vif; |
1433 | ||
1434 | if (local) { | |
1435 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1436 | ip_local_deliver(skb); | |
1437 | if (skb2 == NULL) { | |
1438 | read_unlock(&mrt_lock); | |
1439 | return -ENOBUFS; | |
1440 | } | |
1441 | skb = skb2; | |
1442 | } | |
1443 | ||
1444 | vif = ipmr_find_vif(skb->dev); | |
1445 | if (vif >= 0) { | |
1446 | int err = ipmr_cache_unresolved(vif, skb); | |
1447 | read_unlock(&mrt_lock); | |
1448 | ||
1449 | return err; | |
1450 | } | |
1451 | read_unlock(&mrt_lock); | |
1452 | kfree_skb(skb); | |
1453 | return -ENODEV; | |
1454 | } | |
1455 | ||
1456 | ip_mr_forward(skb, cache, local); | |
1457 | ||
1458 | read_unlock(&mrt_lock); | |
1459 | ||
1460 | if (local) | |
1461 | return ip_local_deliver(skb); | |
1462 | ||
1463 | return 0; | |
1464 | ||
1465 | dont_forward: | |
1466 | if (local) | |
1467 | return ip_local_deliver(skb); | |
1468 | kfree_skb(skb); | |
1469 | return 0; | |
1470 | } | |
1471 | ||
1472 | #ifdef CONFIG_IP_PIMSM_V1 | |
1473 | /* | |
1474 | * Handle IGMP messages of PIMv1 | |
1475 | */ | |
1476 | ||
1477 | int pim_rcv_v1(struct sk_buff * skb) | |
1478 | { | |
1479 | struct igmphdr *pim; | |
1480 | struct iphdr *encap; | |
1481 | struct net_device *reg_dev = NULL; | |
1482 | ||
e905a9ed | 1483 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1484 | goto drop; |
1485 | ||
d9edf9e2 | 1486 | pim = igmp_hdr(skb); |
1da177e4 | 1487 | |
e905a9ed | 1488 | if (!mroute_do_pim || |
1da177e4 | 1489 | skb->len < sizeof(*pim) + sizeof(*encap) || |
e905a9ed | 1490 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1da177e4 LT |
1491 | goto drop; |
1492 | ||
9c70220b ACM |
1493 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1494 | sizeof(struct igmphdr)); | |
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 || |
e905a9ed | 1503 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1504 | goto drop; |
1505 | ||
1506 | read_lock(&mrt_lock); | |
1507 | if (reg_vif_num >= 0) | |
1508 | reg_dev = vif_table[reg_vif_num].dev; | |
1509 | if (reg_dev) | |
1510 | dev_hold(reg_dev); | |
1511 | read_unlock(&mrt_lock); | |
1512 | ||
e905a9ed | 1513 | if (reg_dev == NULL) |
1da177e4 LT |
1514 | goto drop; |
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); | |
1530 | return 0; | |
1531 | drop: | |
1532 | kfree_skb(skb); | |
1533 | return 0; | |
1534 | } | |
1535 | #endif | |
1536 | ||
1537 | #ifdef CONFIG_IP_PIMSM_V2 | |
1538 | static int pim_rcv(struct sk_buff * skb) | |
1539 | { | |
1540 | struct pimreghdr *pim; | |
1541 | struct iphdr *encap; | |
1542 | struct net_device *reg_dev = NULL; | |
1543 | ||
e905a9ed | 1544 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1545 | goto drop; |
1546 | ||
9c70220b | 1547 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1548 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1549 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1550 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1551 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1552 | goto drop; |
1553 | ||
1554 | /* check if the inner packet is destined to mcast group */ | |
9c70220b ACM |
1555 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1556 | sizeof(struct pimreghdr)); | |
f97c1e0c | 1557 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1558 | encap->tot_len == 0 || |
e905a9ed | 1559 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1560 | goto drop; |
1561 | ||
1562 | read_lock(&mrt_lock); | |
1563 | if (reg_vif_num >= 0) | |
1564 | reg_dev = vif_table[reg_vif_num].dev; | |
1565 | if (reg_dev) | |
1566 | dev_hold(reg_dev); | |
1567 | read_unlock(&mrt_lock); | |
1568 | ||
e905a9ed | 1569 | if (reg_dev == NULL) |
1da177e4 LT |
1570 | goto drop; |
1571 | ||
b0e380b1 | 1572 | skb->mac_header = skb->network_header; |
1da177e4 | 1573 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1574 | skb_reset_network_header(skb); |
1da177e4 | 1575 | skb->dev = reg_dev; |
1da177e4 LT |
1576 | skb->protocol = htons(ETH_P_IP); |
1577 | skb->ip_summed = 0; | |
1578 | skb->pkt_type = PACKET_HOST; | |
1579 | dst_release(skb->dst); | |
cf3677ae PE |
1580 | reg_dev->stats.rx_bytes += skb->len; |
1581 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1582 | skb->dst = NULL; |
1583 | nf_reset(skb); | |
1584 | netif_rx(skb); | |
1585 | dev_put(reg_dev); | |
1586 | return 0; | |
1587 | drop: | |
1588 | kfree_skb(skb); | |
1589 | return 0; | |
1590 | } | |
1591 | #endif | |
1592 | ||
1593 | static int | |
1594 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1595 | { | |
1596 | int ct; | |
1597 | struct rtnexthop *nhp; | |
1598 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
27a884dc | 1599 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1600 | struct rtattr *mp_head; |
1601 | ||
1602 | if (dev) | |
1603 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1604 | ||
c354e124 | 1605 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1606 | |
1607 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1608 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1609 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1610 | goto rtattr_failure; | |
c354e124 | 1611 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1612 | nhp->rtnh_flags = 0; |
1613 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1614 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1615 | nhp->rtnh_len = sizeof(*nhp); | |
1616 | } | |
1617 | } | |
1618 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1619 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1620 | rtm->rtm_type = RTN_MULTICAST; |
1621 | return 1; | |
1622 | ||
1623 | rtattr_failure: | |
dc5fc579 | 1624 | nlmsg_trim(skb, b); |
1da177e4 LT |
1625 | return -EMSGSIZE; |
1626 | } | |
1627 | ||
1628 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1629 | { | |
1630 | int err; | |
1631 | struct mfc_cache *cache; | |
ee6b9673 | 1632 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1633 | |
1634 | read_lock(&mrt_lock); | |
1635 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1636 | ||
c354e124 | 1637 | if (cache == NULL) { |
72287490 | 1638 | struct sk_buff *skb2; |
eddc9ec5 | 1639 | struct iphdr *iph; |
1da177e4 LT |
1640 | struct net_device *dev; |
1641 | int vif; | |
1642 | ||
1643 | if (nowait) { | |
1644 | read_unlock(&mrt_lock); | |
1645 | return -EAGAIN; | |
1646 | } | |
1647 | ||
1648 | dev = skb->dev; | |
1649 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1650 | read_unlock(&mrt_lock); | |
1651 | return -ENODEV; | |
1652 | } | |
72287490 AK |
1653 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1654 | if (!skb2) { | |
1655 | read_unlock(&mrt_lock); | |
1656 | return -ENOMEM; | |
1657 | } | |
1658 | ||
e2d1bca7 ACM |
1659 | skb_push(skb2, sizeof(struct iphdr)); |
1660 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1661 | iph = ip_hdr(skb2); |
1662 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1663 | iph->saddr = rt->rt_src; | |
1664 | iph->daddr = rt->rt_dst; | |
1665 | iph->version = 0; | |
72287490 | 1666 | err = ipmr_cache_unresolved(vif, skb2); |
1da177e4 LT |
1667 | read_unlock(&mrt_lock); |
1668 | return err; | |
1669 | } | |
1670 | ||
1671 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1672 | cache->mfc_flags |= MFC_NOTIFY; | |
1673 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1674 | read_unlock(&mrt_lock); | |
1675 | return err; | |
1676 | } | |
1677 | ||
e905a9ed | 1678 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1679 | /* |
1680 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1681 | */ | |
1682 | struct ipmr_vif_iter { | |
1683 | int ct; | |
1684 | }; | |
1685 | ||
1686 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1687 | loff_t pos) | |
1688 | { | |
1689 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
132adf54 | 1690 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 | 1691 | continue; |
e905a9ed | 1692 | if (pos-- == 0) |
1da177e4 LT |
1693 | return &vif_table[iter->ct]; |
1694 | } | |
1695 | return NULL; | |
1696 | } | |
1697 | ||
1698 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 1699 | __acquires(mrt_lock) |
1da177e4 LT |
1700 | { |
1701 | read_lock(&mrt_lock); | |
e905a9ed | 1702 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1703 | : SEQ_START_TOKEN; |
1704 | } | |
1705 | ||
1706 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1707 | { | |
1708 | struct ipmr_vif_iter *iter = seq->private; | |
1709 | ||
1710 | ++*pos; | |
1711 | if (v == SEQ_START_TOKEN) | |
1712 | return ipmr_vif_seq_idx(iter, 0); | |
e905a9ed | 1713 | |
1da177e4 | 1714 | while (++iter->ct < maxvif) { |
132adf54 | 1715 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 LT |
1716 | continue; |
1717 | return &vif_table[iter->ct]; | |
1718 | } | |
1719 | return NULL; | |
1720 | } | |
1721 | ||
1722 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 1723 | __releases(mrt_lock) |
1da177e4 LT |
1724 | { |
1725 | read_unlock(&mrt_lock); | |
1726 | } | |
1727 | ||
1728 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1729 | { | |
1730 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1731 | seq_puts(seq, |
1da177e4 LT |
1732 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1733 | } else { | |
1734 | const struct vif_device *vif = v; | |
1735 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1736 | ||
1737 | seq_printf(seq, | |
1738 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1739 | vif - vif_table, | |
e905a9ed | 1740 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1741 | vif->bytes_out, vif->pkt_out, |
1742 | vif->flags, vif->local, vif->remote); | |
1743 | } | |
1744 | return 0; | |
1745 | } | |
1746 | ||
f690808e | 1747 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1748 | .start = ipmr_vif_seq_start, |
1749 | .next = ipmr_vif_seq_next, | |
1750 | .stop = ipmr_vif_seq_stop, | |
1751 | .show = ipmr_vif_seq_show, | |
1752 | }; | |
1753 | ||
1754 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1755 | { | |
cf7732e4 PE |
1756 | return seq_open_private(file, &ipmr_vif_seq_ops, |
1757 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
1758 | } |
1759 | ||
9a32144e | 1760 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1761 | .owner = THIS_MODULE, |
1762 | .open = ipmr_vif_open, | |
1763 | .read = seq_read, | |
1764 | .llseek = seq_lseek, | |
1765 | .release = seq_release_private, | |
1766 | }; | |
1767 | ||
1768 | struct ipmr_mfc_iter { | |
1769 | struct mfc_cache **cache; | |
1770 | int ct; | |
1771 | }; | |
1772 | ||
1773 | ||
1774 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1775 | { | |
1776 | struct mfc_cache *mfc; | |
1777 | ||
1778 | it->cache = mfc_cache_array; | |
1779 | read_lock(&mrt_lock); | |
e905a9ed | 1780 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
132adf54 | 1781 | for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) |
e905a9ed | 1782 | if (pos-- == 0) |
1da177e4 LT |
1783 | return mfc; |
1784 | read_unlock(&mrt_lock); | |
1785 | ||
1786 | it->cache = &mfc_unres_queue; | |
1787 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1788 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
1da177e4 LT |
1789 | if (pos-- == 0) |
1790 | return mfc; | |
1791 | spin_unlock_bh(&mfc_unres_lock); | |
1792 | ||
1793 | it->cache = NULL; | |
1794 | return NULL; | |
1795 | } | |
1796 | ||
1797 | ||
1798 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1799 | { | |
1800 | struct ipmr_mfc_iter *it = seq->private; | |
1801 | it->cache = NULL; | |
1802 | it->ct = 0; | |
e905a9ed | 1803 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1804 | : SEQ_START_TOKEN; |
1805 | } | |
1806 | ||
1807 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1808 | { | |
1809 | struct mfc_cache *mfc = v; | |
1810 | struct ipmr_mfc_iter *it = seq->private; | |
1811 | ||
1812 | ++*pos; | |
1813 | ||
1814 | if (v == SEQ_START_TOKEN) | |
1815 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1816 | ||
1817 | if (mfc->next) | |
1818 | return mfc->next; | |
e905a9ed YH |
1819 | |
1820 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1821 | goto end_of_list; |
1822 | ||
1823 | BUG_ON(it->cache != mfc_cache_array); | |
1824 | ||
1825 | while (++it->ct < MFC_LINES) { | |
1826 | mfc = mfc_cache_array[it->ct]; | |
1827 | if (mfc) | |
1828 | return mfc; | |
1829 | } | |
1830 | ||
1831 | /* exhausted cache_array, show unresolved */ | |
1832 | read_unlock(&mrt_lock); | |
1833 | it->cache = &mfc_unres_queue; | |
1834 | it->ct = 0; | |
e905a9ed | 1835 | |
1da177e4 LT |
1836 | spin_lock_bh(&mfc_unres_lock); |
1837 | mfc = mfc_unres_queue; | |
e905a9ed | 1838 | if (mfc) |
1da177e4 LT |
1839 | return mfc; |
1840 | ||
1841 | end_of_list: | |
1842 | spin_unlock_bh(&mfc_unres_lock); | |
1843 | it->cache = NULL; | |
1844 | ||
1845 | return NULL; | |
1846 | } | |
1847 | ||
1848 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1849 | { | |
1850 | struct ipmr_mfc_iter *it = seq->private; | |
1851 | ||
1852 | if (it->cache == &mfc_unres_queue) | |
1853 | spin_unlock_bh(&mfc_unres_lock); | |
1854 | else if (it->cache == mfc_cache_array) | |
1855 | read_unlock(&mrt_lock); | |
1856 | } | |
1857 | ||
1858 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1859 | { | |
1860 | int n; | |
1861 | ||
1862 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1863 | seq_puts(seq, |
1da177e4 LT |
1864 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1865 | } else { | |
1866 | const struct mfc_cache *mfc = v; | |
1867 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1868 | |
1da177e4 LT |
1869 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", |
1870 | (unsigned long) mfc->mfc_mcastgrp, | |
1871 | (unsigned long) mfc->mfc_origin, | |
1872 | mfc->mfc_parent, | |
1873 | mfc->mfc_un.res.pkt, | |
1874 | mfc->mfc_un.res.bytes, | |
1875 | mfc->mfc_un.res.wrong_if); | |
1876 | ||
1877 | if (it->cache != &mfc_unres_queue) { | |
132adf54 SH |
1878 | for (n = mfc->mfc_un.res.minvif; |
1879 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1880 | if (VIF_EXISTS(n) | |
1da177e4 | 1881 | && mfc->mfc_un.res.ttls[n] < 255) |
e905a9ed YH |
1882 | seq_printf(seq, |
1883 | " %2d:%-3d", | |
1da177e4 LT |
1884 | n, mfc->mfc_un.res.ttls[n]); |
1885 | } | |
1886 | } | |
1887 | seq_putc(seq, '\n'); | |
1888 | } | |
1889 | return 0; | |
1890 | } | |
1891 | ||
f690808e | 1892 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1893 | .start = ipmr_mfc_seq_start, |
1894 | .next = ipmr_mfc_seq_next, | |
1895 | .stop = ipmr_mfc_seq_stop, | |
1896 | .show = ipmr_mfc_seq_show, | |
1897 | }; | |
1898 | ||
1899 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1900 | { | |
cf7732e4 PE |
1901 | return seq_open_private(file, &ipmr_mfc_seq_ops, |
1902 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
1903 | } |
1904 | ||
9a32144e | 1905 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1906 | .owner = THIS_MODULE, |
1907 | .open = ipmr_mfc_open, | |
1908 | .read = seq_read, | |
1909 | .llseek = seq_lseek, | |
1910 | .release = seq_release_private, | |
1911 | }; | |
e905a9ed | 1912 | #endif |
1da177e4 LT |
1913 | |
1914 | #ifdef CONFIG_IP_PIMSM_V2 | |
1915 | static struct net_protocol pim_protocol = { | |
1916 | .handler = pim_rcv, | |
1917 | }; | |
1918 | #endif | |
1919 | ||
1920 | ||
1921 | /* | |
1922 | * Setup for IP multicast routing | |
1923 | */ | |
e905a9ed | 1924 | |
03d2f897 | 1925 | int __init ip_mr_init(void) |
1da177e4 | 1926 | { |
03d2f897 WC |
1927 | int err; |
1928 | ||
1da177e4 LT |
1929 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
1930 | sizeof(struct mfc_cache), | |
e5d679f3 | 1931 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 1932 | NULL); |
03d2f897 WC |
1933 | if (!mrt_cachep) |
1934 | return -ENOMEM; | |
1935 | ||
b24b8a24 | 1936 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
03d2f897 WC |
1937 | err = register_netdevice_notifier(&ip_mr_notifier); |
1938 | if (err) | |
1939 | goto reg_notif_fail; | |
e905a9ed | 1940 | #ifdef CONFIG_PROC_FS |
03d2f897 WC |
1941 | err = -ENOMEM; |
1942 | if (!proc_net_fops_create(&init_net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
1943 | goto proc_vif_fail; | |
1944 | if (!proc_net_fops_create(&init_net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
1945 | goto proc_cache_fail; | |
e905a9ed | 1946 | #endif |
03d2f897 WC |
1947 | return 0; |
1948 | reg_notif_fail: | |
1949 | kmem_cache_destroy(mrt_cachep); | |
1950 | #ifdef CONFIG_PROC_FS | |
1951 | proc_vif_fail: | |
1952 | unregister_netdevice_notifier(&ip_mr_notifier); | |
1953 | proc_cache_fail: | |
1954 | proc_net_remove(&init_net, "ip_mr_vif"); | |
1955 | #endif | |
1956 | return err; | |
1da177e4 | 1957 | } |