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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
4 | * (c) 1995 Alan Cox, <alan@redhat.com> | |
5 | * Linux Consultancy and Custom Driver Development | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Version: $Id: ipmr.c,v 1.65 2001/10/31 21:55:54 davem Exp $ | |
13 | * | |
14 | * Fixes: | |
15 | * Michael Chastain : Incorrect size of copying. | |
16 | * Alan Cox : Added the cache manager code | |
17 | * Alan Cox : Fixed the clone/copy bug and device race. | |
18 | * Mike McLagan : Routing by source | |
19 | * Malcolm Beattie : Buffer handling fixes. | |
20 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
21 | * SVR Anand : Fixed several multicast bugs and problems. | |
22 | * Alexey Kuznetsov : Status, optimisations and more. | |
23 | * Brad Parker : Better behaviour on mrouted upcall | |
24 | * overflow. | |
25 | * Carlos Picoto : PIMv1 Support | |
26 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
27 | * Relax this requrement to work with older peers. | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/config.h> | |
32 | #include <asm/system.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <linux/types.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/timer.h> | |
38 | #include <linux/mm.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/fcntl.h> | |
41 | #include <linux/stat.h> | |
42 | #include <linux/socket.h> | |
43 | #include <linux/in.h> | |
44 | #include <linux/inet.h> | |
45 | #include <linux/netdevice.h> | |
46 | #include <linux/inetdevice.h> | |
47 | #include <linux/igmp.h> | |
48 | #include <linux/proc_fs.h> | |
49 | #include <linux/seq_file.h> | |
50 | #include <linux/mroute.h> | |
51 | #include <linux/init.h> | |
52 | #include <net/ip.h> | |
53 | #include <net/protocol.h> | |
54 | #include <linux/skbuff.h> | |
14c85021 | 55 | #include <net/route.h> |
1da177e4 LT |
56 | #include <net/sock.h> |
57 | #include <net/icmp.h> | |
58 | #include <net/udp.h> | |
59 | #include <net/raw.h> | |
60 | #include <linux/notifier.h> | |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/netfilter_ipv4.h> | |
63 | #include <net/ipip.h> | |
64 | #include <net/checksum.h> | |
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 | ||
ba89966c | 107 | static kmem_cache_t *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 | ||
121 | static | |
122 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
123 | { | |
124 | struct net_device *dev; | |
125 | ||
126 | dev = __dev_get_by_name("tunl0"); | |
127 | ||
128 | if (dev) { | |
129 | int err; | |
130 | struct ifreq ifr; | |
131 | mm_segment_t oldfs; | |
132 | struct ip_tunnel_parm p; | |
133 | struct in_device *in_dev; | |
134 | ||
135 | memset(&p, 0, sizeof(p)); | |
136 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
137 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
138 | p.iph.version = 4; | |
139 | p.iph.ihl = 5; | |
140 | p.iph.protocol = IPPROTO_IPIP; | |
141 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
142 | ifr.ifr_ifru.ifru_data = (void*)&p; | |
143 | ||
144 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
145 | err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
146 | set_fs(oldfs); | |
147 | ||
148 | dev = NULL; | |
149 | ||
150 | if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) { | |
151 | dev->flags |= IFF_MULTICAST; | |
152 | ||
e5ed6399 | 153 | in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
154 | if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL) |
155 | goto failure; | |
156 | in_dev->cnf.rp_filter = 0; | |
157 | ||
158 | if (dev_open(dev)) | |
159 | goto failure; | |
160 | } | |
161 | } | |
162 | return dev; | |
163 | ||
164 | failure: | |
165 | /* allow the register to be completed before unregistering. */ | |
166 | rtnl_unlock(); | |
167 | rtnl_lock(); | |
168 | ||
169 | unregister_netdevice(dev); | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | #ifdef CONFIG_IP_PIMSM | |
174 | ||
175 | static int reg_vif_num = -1; | |
176 | ||
177 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
178 | { | |
179 | read_lock(&mrt_lock); | |
180 | ((struct net_device_stats*)dev->priv)->tx_bytes += skb->len; | |
181 | ((struct net_device_stats*)dev->priv)->tx_packets++; | |
182 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); | |
183 | read_unlock(&mrt_lock); | |
184 | kfree_skb(skb); | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static struct net_device_stats *reg_vif_get_stats(struct net_device *dev) | |
189 | { | |
190 | return (struct net_device_stats*)dev->priv; | |
191 | } | |
192 | ||
193 | static void reg_vif_setup(struct net_device *dev) | |
194 | { | |
195 | dev->type = ARPHRD_PIMREG; | |
196 | dev->mtu = 1500 - sizeof(struct iphdr) - 8; | |
197 | dev->flags = IFF_NOARP; | |
198 | dev->hard_start_xmit = reg_vif_xmit; | |
199 | dev->get_stats = reg_vif_get_stats; | |
200 | dev->destructor = free_netdev; | |
201 | } | |
202 | ||
203 | static struct net_device *ipmr_reg_vif(void) | |
204 | { | |
205 | struct net_device *dev; | |
206 | struct in_device *in_dev; | |
207 | ||
208 | dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg", | |
209 | reg_vif_setup); | |
210 | ||
211 | if (dev == NULL) | |
212 | return NULL; | |
213 | ||
214 | if (register_netdevice(dev)) { | |
215 | free_netdev(dev); | |
216 | return NULL; | |
217 | } | |
218 | dev->iflink = 0; | |
219 | ||
220 | if ((in_dev = inetdev_init(dev)) == NULL) | |
221 | goto failure; | |
222 | ||
223 | in_dev->cnf.rp_filter = 0; | |
224 | ||
225 | if (dev_open(dev)) | |
226 | goto failure; | |
227 | ||
228 | return dev; | |
229 | ||
230 | failure: | |
231 | /* allow the register to be completed before unregistering. */ | |
232 | rtnl_unlock(); | |
233 | rtnl_lock(); | |
234 | ||
235 | unregister_netdevice(dev); | |
236 | return NULL; | |
237 | } | |
238 | #endif | |
239 | ||
240 | /* | |
241 | * Delete a VIF entry | |
242 | */ | |
243 | ||
244 | static int vif_delete(int vifi) | |
245 | { | |
246 | struct vif_device *v; | |
247 | struct net_device *dev; | |
248 | struct in_device *in_dev; | |
249 | ||
250 | if (vifi < 0 || vifi >= maxvif) | |
251 | return -EADDRNOTAVAIL; | |
252 | ||
253 | v = &vif_table[vifi]; | |
254 | ||
255 | write_lock_bh(&mrt_lock); | |
256 | dev = v->dev; | |
257 | v->dev = NULL; | |
258 | ||
259 | if (!dev) { | |
260 | write_unlock_bh(&mrt_lock); | |
261 | return -EADDRNOTAVAIL; | |
262 | } | |
263 | ||
264 | #ifdef CONFIG_IP_PIMSM | |
265 | if (vifi == reg_vif_num) | |
266 | reg_vif_num = -1; | |
267 | #endif | |
268 | ||
269 | if (vifi+1 == maxvif) { | |
270 | int tmp; | |
271 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
272 | if (VIF_EXISTS(tmp)) | |
273 | break; | |
274 | } | |
275 | maxvif = tmp+1; | |
276 | } | |
277 | ||
278 | write_unlock_bh(&mrt_lock); | |
279 | ||
280 | dev_set_allmulti(dev, -1); | |
281 | ||
e5ed6399 | 282 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
283 | in_dev->cnf.mc_forwarding--; |
284 | ip_rt_multicast_event(in_dev); | |
285 | } | |
286 | ||
287 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
288 | unregister_netdevice(dev); | |
289 | ||
290 | dev_put(dev); | |
291 | return 0; | |
292 | } | |
293 | ||
294 | /* Destroy an unresolved cache entry, killing queued skbs | |
295 | and reporting error to netlink readers. | |
296 | */ | |
297 | ||
298 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
299 | { | |
300 | struct sk_buff *skb; | |
9ef1d4c7 | 301 | struct nlmsgerr *e; |
1da177e4 LT |
302 | |
303 | atomic_dec(&cache_resolve_queue_len); | |
304 | ||
305 | while((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { | |
306 | if (skb->nh.iph->version == 0) { | |
307 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); | |
308 | nlh->nlmsg_type = NLMSG_ERROR; | |
309 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
310 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
311 | e = NLMSG_DATA(nlh); |
312 | e->error = -ETIMEDOUT; | |
313 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 LT |
314 | netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); |
315 | } else | |
316 | kfree_skb(skb); | |
317 | } | |
318 | ||
319 | kmem_cache_free(mrt_cachep, c); | |
320 | } | |
321 | ||
322 | ||
323 | /* Single timer process for all the unresolved queue. */ | |
324 | ||
325 | static void ipmr_expire_process(unsigned long dummy) | |
326 | { | |
327 | unsigned long now; | |
328 | unsigned long expires; | |
329 | struct mfc_cache *c, **cp; | |
330 | ||
331 | if (!spin_trylock(&mfc_unres_lock)) { | |
332 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
333 | return; | |
334 | } | |
335 | ||
336 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
337 | goto out; | |
338 | ||
339 | now = jiffies; | |
340 | expires = 10*HZ; | |
341 | cp = &mfc_unres_queue; | |
342 | ||
343 | while ((c=*cp) != NULL) { | |
344 | if (time_after(c->mfc_un.unres.expires, now)) { | |
345 | unsigned long interval = c->mfc_un.unres.expires - now; | |
346 | if (interval < expires) | |
347 | expires = interval; | |
348 | cp = &c->next; | |
349 | continue; | |
350 | } | |
351 | ||
352 | *cp = c->next; | |
353 | ||
354 | ipmr_destroy_unres(c); | |
355 | } | |
356 | ||
357 | if (atomic_read(&cache_resolve_queue_len)) | |
358 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
359 | ||
360 | out: | |
361 | spin_unlock(&mfc_unres_lock); | |
362 | } | |
363 | ||
364 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
365 | ||
d1b04c08 | 366 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
367 | { |
368 | int vifi; | |
369 | ||
370 | cache->mfc_un.res.minvif = MAXVIFS; | |
371 | cache->mfc_un.res.maxvif = 0; | |
372 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
373 | ||
374 | for (vifi=0; vifi<maxvif; vifi++) { | |
375 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
376 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
377 | if (cache->mfc_un.res.minvif > vifi) | |
378 | cache->mfc_un.res.minvif = vifi; | |
379 | if (cache->mfc_un.res.maxvif <= vifi) | |
380 | cache->mfc_un.res.maxvif = vifi + 1; | |
381 | } | |
382 | } | |
383 | } | |
384 | ||
385 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
386 | { | |
387 | int vifi = vifc->vifc_vifi; | |
388 | struct vif_device *v = &vif_table[vifi]; | |
389 | struct net_device *dev; | |
390 | struct in_device *in_dev; | |
391 | ||
392 | /* Is vif busy ? */ | |
393 | if (VIF_EXISTS(vifi)) | |
394 | return -EADDRINUSE; | |
395 | ||
396 | switch (vifc->vifc_flags) { | |
397 | #ifdef CONFIG_IP_PIMSM | |
398 | case VIFF_REGISTER: | |
399 | /* | |
400 | * Special Purpose VIF in PIM | |
401 | * All the packets will be sent to the daemon | |
402 | */ | |
403 | if (reg_vif_num >= 0) | |
404 | return -EADDRINUSE; | |
405 | dev = ipmr_reg_vif(); | |
406 | if (!dev) | |
407 | return -ENOBUFS; | |
408 | break; | |
409 | #endif | |
410 | case VIFF_TUNNEL: | |
411 | dev = ipmr_new_tunnel(vifc); | |
412 | if (!dev) | |
413 | return -ENOBUFS; | |
414 | break; | |
415 | case 0: | |
416 | dev=ip_dev_find(vifc->vifc_lcl_addr.s_addr); | |
417 | if (!dev) | |
418 | return -EADDRNOTAVAIL; | |
419 | __dev_put(dev); | |
420 | break; | |
421 | default: | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
e5ed6399 | 425 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 LT |
426 | return -EADDRNOTAVAIL; |
427 | in_dev->cnf.mc_forwarding++; | |
428 | dev_set_allmulti(dev, +1); | |
429 | ip_rt_multicast_event(in_dev); | |
430 | ||
431 | /* | |
432 | * Fill in the VIF structures | |
433 | */ | |
434 | v->rate_limit=vifc->vifc_rate_limit; | |
435 | v->local=vifc->vifc_lcl_addr.s_addr; | |
436 | v->remote=vifc->vifc_rmt_addr.s_addr; | |
437 | v->flags=vifc->vifc_flags; | |
438 | if (!mrtsock) | |
439 | v->flags |= VIFF_STATIC; | |
440 | v->threshold=vifc->vifc_threshold; | |
441 | v->bytes_in = 0; | |
442 | v->bytes_out = 0; | |
443 | v->pkt_in = 0; | |
444 | v->pkt_out = 0; | |
445 | v->link = dev->ifindex; | |
446 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
447 | v->link = dev->iflink; | |
448 | ||
449 | /* And finish update writing critical data */ | |
450 | write_lock_bh(&mrt_lock); | |
451 | dev_hold(dev); | |
452 | v->dev=dev; | |
453 | #ifdef CONFIG_IP_PIMSM | |
454 | if (v->flags&VIFF_REGISTER) | |
455 | reg_vif_num = vifi; | |
456 | #endif | |
457 | if (vifi+1 > maxvif) | |
458 | maxvif = vifi+1; | |
459 | write_unlock_bh(&mrt_lock); | |
460 | return 0; | |
461 | } | |
462 | ||
463 | static struct mfc_cache *ipmr_cache_find(__u32 origin, __u32 mcastgrp) | |
464 | { | |
465 | int line=MFC_HASH(mcastgrp,origin); | |
466 | struct mfc_cache *c; | |
467 | ||
468 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
469 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
470 | break; | |
471 | } | |
472 | return c; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Allocate a multicast cache entry | |
477 | */ | |
478 | static struct mfc_cache *ipmr_cache_alloc(void) | |
479 | { | |
480 | struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_KERNEL); | |
481 | if(c==NULL) | |
482 | return NULL; | |
483 | memset(c, 0, sizeof(*c)); | |
484 | c->mfc_un.res.minvif = MAXVIFS; | |
485 | return c; | |
486 | } | |
487 | ||
488 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
489 | { | |
490 | struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); | |
491 | if(c==NULL) | |
492 | return NULL; | |
493 | memset(c, 0, sizeof(*c)); | |
494 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
495 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
496 | return c; | |
497 | } | |
498 | ||
499 | /* | |
500 | * A cache entry has gone into a resolved state from queued | |
501 | */ | |
502 | ||
503 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) | |
504 | { | |
505 | struct sk_buff *skb; | |
9ef1d4c7 | 506 | struct nlmsgerr *e; |
1da177e4 LT |
507 | |
508 | /* | |
509 | * Play the pending entries through our router | |
510 | */ | |
511 | ||
512 | while((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
513 | if (skb->nh.iph->version == 0) { | |
514 | int err; | |
515 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); | |
516 | ||
517 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
518 | nlh->nlmsg_len = skb->tail - (u8*)nlh; | |
519 | } else { | |
520 | nlh->nlmsg_type = NLMSG_ERROR; | |
521 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
522 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
523 | e = NLMSG_DATA(nlh); |
524 | e->error = -EMSGSIZE; | |
525 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 LT |
526 | } |
527 | err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); | |
528 | } else | |
529 | ip_mr_forward(skb, c, 0); | |
530 | } | |
531 | } | |
532 | ||
533 | /* | |
534 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
535 | * expects the following bizarre scheme. | |
536 | * | |
537 | * Called under mrt_lock. | |
538 | */ | |
539 | ||
540 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) | |
541 | { | |
542 | struct sk_buff *skb; | |
543 | int ihl = pkt->nh.iph->ihl<<2; | |
544 | struct igmphdr *igmp; | |
545 | struct igmpmsg *msg; | |
546 | int ret; | |
547 | ||
548 | #ifdef CONFIG_IP_PIMSM | |
549 | if (assert == IGMPMSG_WHOLEPKT) | |
550 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
551 | else | |
552 | #endif | |
553 | skb = alloc_skb(128, GFP_ATOMIC); | |
554 | ||
555 | if(!skb) | |
556 | return -ENOBUFS; | |
557 | ||
558 | #ifdef CONFIG_IP_PIMSM | |
559 | if (assert == IGMPMSG_WHOLEPKT) { | |
560 | /* Ugly, but we have no choice with this interface. | |
561 | Duplicate old header, fix ihl, length etc. | |
562 | And all this only to mangle msg->im_msgtype and | |
563 | to set msg->im_mbz to "mbz" :-) | |
564 | */ | |
565 | msg = (struct igmpmsg*)skb_push(skb, sizeof(struct iphdr)); | |
566 | skb->nh.raw = skb->h.raw = (u8*)msg; | |
567 | memcpy(msg, pkt->nh.raw, sizeof(struct iphdr)); | |
568 | msg->im_msgtype = IGMPMSG_WHOLEPKT; | |
569 | msg->im_mbz = 0; | |
570 | msg->im_vif = reg_vif_num; | |
571 | skb->nh.iph->ihl = sizeof(struct iphdr) >> 2; | |
572 | skb->nh.iph->tot_len = htons(ntohs(pkt->nh.iph->tot_len) + sizeof(struct iphdr)); | |
573 | } else | |
574 | #endif | |
575 | { | |
576 | ||
577 | /* | |
578 | * Copy the IP header | |
579 | */ | |
580 | ||
581 | skb->nh.iph = (struct iphdr *)skb_put(skb, ihl); | |
582 | memcpy(skb->data,pkt->data,ihl); | |
583 | skb->nh.iph->protocol = 0; /* Flag to the kernel this is a route add */ | |
584 | msg = (struct igmpmsg*)skb->nh.iph; | |
585 | msg->im_vif = vifi; | |
586 | skb->dst = dst_clone(pkt->dst); | |
587 | ||
588 | /* | |
589 | * Add our header | |
590 | */ | |
591 | ||
592 | igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); | |
593 | igmp->type = | |
594 | msg->im_msgtype = assert; | |
595 | igmp->code = 0; | |
596 | skb->nh.iph->tot_len=htons(skb->len); /* Fix the length */ | |
597 | skb->h.raw = skb->nh.raw; | |
598 | } | |
599 | ||
600 | if (mroute_socket == NULL) { | |
601 | kfree_skb(skb); | |
602 | return -EINVAL; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Deliver to mrouted | |
607 | */ | |
608 | if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { | |
609 | if (net_ratelimit()) | |
610 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
611 | kfree_skb(skb); | |
612 | } | |
613 | ||
614 | return ret; | |
615 | } | |
616 | ||
617 | /* | |
618 | * Queue a packet for resolution. It gets locked cache entry! | |
619 | */ | |
620 | ||
621 | static int | |
622 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
623 | { | |
624 | int err; | |
625 | struct mfc_cache *c; | |
626 | ||
627 | spin_lock_bh(&mfc_unres_lock); | |
628 | for (c=mfc_unres_queue; c; c=c->next) { | |
629 | if (c->mfc_mcastgrp == skb->nh.iph->daddr && | |
630 | c->mfc_origin == skb->nh.iph->saddr) | |
631 | break; | |
632 | } | |
633 | ||
634 | if (c == NULL) { | |
635 | /* | |
636 | * Create a new entry if allowable | |
637 | */ | |
638 | ||
639 | if (atomic_read(&cache_resolve_queue_len)>=10 || | |
640 | (c=ipmr_cache_alloc_unres())==NULL) { | |
641 | spin_unlock_bh(&mfc_unres_lock); | |
642 | ||
643 | kfree_skb(skb); | |
644 | return -ENOBUFS; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Fill in the new cache entry | |
649 | */ | |
650 | c->mfc_parent=-1; | |
651 | c->mfc_origin=skb->nh.iph->saddr; | |
652 | c->mfc_mcastgrp=skb->nh.iph->daddr; | |
653 | ||
654 | /* | |
655 | * Reflect first query at mrouted. | |
656 | */ | |
657 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
658 | /* If the report failed throw the cache entry | |
659 | out - Brad Parker | |
660 | */ | |
661 | spin_unlock_bh(&mfc_unres_lock); | |
662 | ||
663 | kmem_cache_free(mrt_cachep, c); | |
664 | kfree_skb(skb); | |
665 | return err; | |
666 | } | |
667 | ||
668 | atomic_inc(&cache_resolve_queue_len); | |
669 | c->next = mfc_unres_queue; | |
670 | mfc_unres_queue = c; | |
671 | ||
672 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
673 | } | |
674 | ||
675 | /* | |
676 | * See if we can append the packet | |
677 | */ | |
678 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
679 | kfree_skb(skb); | |
680 | err = -ENOBUFS; | |
681 | } else { | |
682 | skb_queue_tail(&c->mfc_un.unres.unresolved,skb); | |
683 | err = 0; | |
684 | } | |
685 | ||
686 | spin_unlock_bh(&mfc_unres_lock); | |
687 | return err; | |
688 | } | |
689 | ||
690 | /* | |
691 | * MFC cache manipulation by user space mroute daemon | |
692 | */ | |
693 | ||
694 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
695 | { | |
696 | int line; | |
697 | struct mfc_cache *c, **cp; | |
698 | ||
699 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
700 | ||
701 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
702 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
703 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
704 | write_lock_bh(&mrt_lock); | |
705 | *cp = c->next; | |
706 | write_unlock_bh(&mrt_lock); | |
707 | ||
708 | kmem_cache_free(mrt_cachep, c); | |
709 | return 0; | |
710 | } | |
711 | } | |
712 | return -ENOENT; | |
713 | } | |
714 | ||
715 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
716 | { | |
717 | int line; | |
718 | struct mfc_cache *uc, *c, **cp; | |
719 | ||
720 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
721 | ||
722 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
723 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
724 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
725 | break; | |
726 | } | |
727 | ||
728 | if (c != NULL) { | |
729 | write_lock_bh(&mrt_lock); | |
730 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 731 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
732 | if (!mrtsock) |
733 | c->mfc_flags |= MFC_STATIC; | |
734 | write_unlock_bh(&mrt_lock); | |
735 | return 0; | |
736 | } | |
737 | ||
738 | if(!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) | |
739 | return -EINVAL; | |
740 | ||
741 | c=ipmr_cache_alloc(); | |
742 | if (c==NULL) | |
743 | return -ENOMEM; | |
744 | ||
745 | c->mfc_origin=mfc->mfcc_origin.s_addr; | |
746 | c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; | |
747 | c->mfc_parent=mfc->mfcc_parent; | |
d1b04c08 | 748 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
749 | if (!mrtsock) |
750 | c->mfc_flags |= MFC_STATIC; | |
751 | ||
752 | write_lock_bh(&mrt_lock); | |
753 | c->next = mfc_cache_array[line]; | |
754 | mfc_cache_array[line] = c; | |
755 | write_unlock_bh(&mrt_lock); | |
756 | ||
757 | /* | |
758 | * Check to see if we resolved a queued list. If so we | |
759 | * need to send on the frames and tidy up. | |
760 | */ | |
761 | spin_lock_bh(&mfc_unres_lock); | |
762 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
763 | cp = &uc->next) { | |
764 | if (uc->mfc_origin == c->mfc_origin && | |
765 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
766 | *cp = uc->next; | |
767 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
768 | del_timer(&ipmr_expire_timer); | |
769 | break; | |
770 | } | |
771 | } | |
772 | spin_unlock_bh(&mfc_unres_lock); | |
773 | ||
774 | if (uc) { | |
775 | ipmr_cache_resolve(uc, c); | |
776 | kmem_cache_free(mrt_cachep, uc); | |
777 | } | |
778 | return 0; | |
779 | } | |
780 | ||
781 | /* | |
782 | * Close the multicast socket, and clear the vif tables etc | |
783 | */ | |
784 | ||
785 | static void mroute_clean_tables(struct sock *sk) | |
786 | { | |
787 | int i; | |
788 | ||
789 | /* | |
790 | * Shut down all active vif entries | |
791 | */ | |
792 | for(i=0; i<maxvif; i++) { | |
793 | if (!(vif_table[i].flags&VIFF_STATIC)) | |
794 | vif_delete(i); | |
795 | } | |
796 | ||
797 | /* | |
798 | * Wipe the cache | |
799 | */ | |
800 | for (i=0;i<MFC_LINES;i++) { | |
801 | struct mfc_cache *c, **cp; | |
802 | ||
803 | cp = &mfc_cache_array[i]; | |
804 | while ((c = *cp) != NULL) { | |
805 | if (c->mfc_flags&MFC_STATIC) { | |
806 | cp = &c->next; | |
807 | continue; | |
808 | } | |
809 | write_lock_bh(&mrt_lock); | |
810 | *cp = c->next; | |
811 | write_unlock_bh(&mrt_lock); | |
812 | ||
813 | kmem_cache_free(mrt_cachep, c); | |
814 | } | |
815 | } | |
816 | ||
817 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
818 | struct mfc_cache *c; | |
819 | ||
820 | spin_lock_bh(&mfc_unres_lock); | |
821 | while (mfc_unres_queue != NULL) { | |
822 | c = mfc_unres_queue; | |
823 | mfc_unres_queue = c->next; | |
824 | spin_unlock_bh(&mfc_unres_lock); | |
825 | ||
826 | ipmr_destroy_unres(c); | |
827 | ||
828 | spin_lock_bh(&mfc_unres_lock); | |
829 | } | |
830 | spin_unlock_bh(&mfc_unres_lock); | |
831 | } | |
832 | } | |
833 | ||
834 | static void mrtsock_destruct(struct sock *sk) | |
835 | { | |
836 | rtnl_lock(); | |
837 | if (sk == mroute_socket) { | |
838 | ipv4_devconf.mc_forwarding--; | |
839 | ||
840 | write_lock_bh(&mrt_lock); | |
841 | mroute_socket=NULL; | |
842 | write_unlock_bh(&mrt_lock); | |
843 | ||
844 | mroute_clean_tables(sk); | |
845 | } | |
846 | rtnl_unlock(); | |
847 | } | |
848 | ||
849 | /* | |
850 | * Socket options and virtual interface manipulation. The whole | |
851 | * virtual interface system is a complete heap, but unfortunately | |
852 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
853 | * MOSPF/PIM router set up we can clean this up. | |
854 | */ | |
855 | ||
856 | int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) | |
857 | { | |
858 | int ret; | |
859 | struct vifctl vif; | |
860 | struct mfcctl mfc; | |
861 | ||
862 | if(optname!=MRT_INIT) | |
863 | { | |
864 | if(sk!=mroute_socket && !capable(CAP_NET_ADMIN)) | |
865 | return -EACCES; | |
866 | } | |
867 | ||
868 | switch(optname) | |
869 | { | |
870 | case MRT_INIT: | |
871 | if (sk->sk_type != SOCK_RAW || | |
872 | inet_sk(sk)->num != IPPROTO_IGMP) | |
873 | return -EOPNOTSUPP; | |
874 | if(optlen!=sizeof(int)) | |
875 | return -ENOPROTOOPT; | |
876 | ||
877 | rtnl_lock(); | |
878 | if (mroute_socket) { | |
879 | rtnl_unlock(); | |
880 | return -EADDRINUSE; | |
881 | } | |
882 | ||
883 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
884 | if (ret == 0) { | |
885 | write_lock_bh(&mrt_lock); | |
886 | mroute_socket=sk; | |
887 | write_unlock_bh(&mrt_lock); | |
888 | ||
889 | ipv4_devconf.mc_forwarding++; | |
890 | } | |
891 | rtnl_unlock(); | |
892 | return ret; | |
893 | case MRT_DONE: | |
894 | if (sk!=mroute_socket) | |
895 | return -EACCES; | |
896 | return ip_ra_control(sk, 0, NULL); | |
897 | case MRT_ADD_VIF: | |
898 | case MRT_DEL_VIF: | |
899 | if(optlen!=sizeof(vif)) | |
900 | return -EINVAL; | |
901 | if (copy_from_user(&vif,optval,sizeof(vif))) | |
902 | return -EFAULT; | |
903 | if(vif.vifc_vifi >= MAXVIFS) | |
904 | return -ENFILE; | |
905 | rtnl_lock(); | |
906 | if (optname==MRT_ADD_VIF) { | |
907 | ret = vif_add(&vif, sk==mroute_socket); | |
908 | } else { | |
909 | ret = vif_delete(vif.vifc_vifi); | |
910 | } | |
911 | rtnl_unlock(); | |
912 | return ret; | |
913 | ||
914 | /* | |
915 | * Manipulate the forwarding caches. These live | |
916 | * in a sort of kernel/user symbiosis. | |
917 | */ | |
918 | case MRT_ADD_MFC: | |
919 | case MRT_DEL_MFC: | |
920 | if(optlen!=sizeof(mfc)) | |
921 | return -EINVAL; | |
922 | if (copy_from_user(&mfc,optval, sizeof(mfc))) | |
923 | return -EFAULT; | |
924 | rtnl_lock(); | |
925 | if (optname==MRT_DEL_MFC) | |
926 | ret = ipmr_mfc_delete(&mfc); | |
927 | else | |
928 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); | |
929 | rtnl_unlock(); | |
930 | return ret; | |
931 | /* | |
932 | * Control PIM assert. | |
933 | */ | |
934 | case MRT_ASSERT: | |
935 | { | |
936 | int v; | |
937 | if(get_user(v,(int __user *)optval)) | |
938 | return -EFAULT; | |
939 | mroute_do_assert=(v)?1:0; | |
940 | return 0; | |
941 | } | |
942 | #ifdef CONFIG_IP_PIMSM | |
943 | case MRT_PIM: | |
944 | { | |
945 | int v, ret; | |
946 | if(get_user(v,(int __user *)optval)) | |
947 | return -EFAULT; | |
948 | v = (v)?1:0; | |
949 | rtnl_lock(); | |
950 | ret = 0; | |
951 | if (v != mroute_do_pim) { | |
952 | mroute_do_pim = v; | |
953 | mroute_do_assert = v; | |
954 | #ifdef CONFIG_IP_PIMSM_V2 | |
955 | if (mroute_do_pim) | |
956 | ret = inet_add_protocol(&pim_protocol, | |
957 | IPPROTO_PIM); | |
958 | else | |
959 | ret = inet_del_protocol(&pim_protocol, | |
960 | IPPROTO_PIM); | |
961 | if (ret < 0) | |
962 | ret = -EAGAIN; | |
963 | #endif | |
964 | } | |
965 | rtnl_unlock(); | |
966 | return ret; | |
967 | } | |
968 | #endif | |
969 | /* | |
970 | * Spurious command, or MRT_VERSION which you cannot | |
971 | * set. | |
972 | */ | |
973 | default: | |
974 | return -ENOPROTOOPT; | |
975 | } | |
976 | } | |
977 | ||
978 | /* | |
979 | * Getsock opt support for the multicast routing system. | |
980 | */ | |
981 | ||
982 | int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) | |
983 | { | |
984 | int olr; | |
985 | int val; | |
986 | ||
987 | if(optname!=MRT_VERSION && | |
988 | #ifdef CONFIG_IP_PIMSM | |
989 | optname!=MRT_PIM && | |
990 | #endif | |
991 | optname!=MRT_ASSERT) | |
992 | return -ENOPROTOOPT; | |
993 | ||
994 | if (get_user(olr, optlen)) | |
995 | return -EFAULT; | |
996 | ||
997 | olr = min_t(unsigned int, olr, sizeof(int)); | |
998 | if (olr < 0) | |
999 | return -EINVAL; | |
1000 | ||
1001 | if(put_user(olr,optlen)) | |
1002 | return -EFAULT; | |
1003 | if(optname==MRT_VERSION) | |
1004 | val=0x0305; | |
1005 | #ifdef CONFIG_IP_PIMSM | |
1006 | else if(optname==MRT_PIM) | |
1007 | val=mroute_do_pim; | |
1008 | #endif | |
1009 | else | |
1010 | val=mroute_do_assert; | |
1011 | if(copy_to_user(optval,&val,olr)) | |
1012 | return -EFAULT; | |
1013 | return 0; | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * The IP multicast ioctl support routines. | |
1018 | */ | |
1019 | ||
1020 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1021 | { | |
1022 | struct sioc_sg_req sr; | |
1023 | struct sioc_vif_req vr; | |
1024 | struct vif_device *vif; | |
1025 | struct mfc_cache *c; | |
1026 | ||
1027 | switch(cmd) | |
1028 | { | |
1029 | case SIOCGETVIFCNT: | |
1030 | if (copy_from_user(&vr,arg,sizeof(vr))) | |
1031 | return -EFAULT; | |
1032 | if(vr.vifi>=maxvif) | |
1033 | return -EINVAL; | |
1034 | read_lock(&mrt_lock); | |
1035 | vif=&vif_table[vr.vifi]; | |
1036 | if(VIF_EXISTS(vr.vifi)) { | |
1037 | vr.icount=vif->pkt_in; | |
1038 | vr.ocount=vif->pkt_out; | |
1039 | vr.ibytes=vif->bytes_in; | |
1040 | vr.obytes=vif->bytes_out; | |
1041 | read_unlock(&mrt_lock); | |
1042 | ||
1043 | if (copy_to_user(arg,&vr,sizeof(vr))) | |
1044 | return -EFAULT; | |
1045 | return 0; | |
1046 | } | |
1047 | read_unlock(&mrt_lock); | |
1048 | return -EADDRNOTAVAIL; | |
1049 | case SIOCGETSGCNT: | |
1050 | if (copy_from_user(&sr,arg,sizeof(sr))) | |
1051 | return -EFAULT; | |
1052 | ||
1053 | read_lock(&mrt_lock); | |
1054 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1055 | if (c) { | |
1056 | sr.pktcnt = c->mfc_un.res.pkt; | |
1057 | sr.bytecnt = c->mfc_un.res.bytes; | |
1058 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1059 | read_unlock(&mrt_lock); | |
1060 | ||
1061 | if (copy_to_user(arg,&sr,sizeof(sr))) | |
1062 | return -EFAULT; | |
1063 | return 0; | |
1064 | } | |
1065 | read_unlock(&mrt_lock); | |
1066 | return -EADDRNOTAVAIL; | |
1067 | default: | |
1068 | return -ENOIOCTLCMD; | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | ||
1073 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1074 | { | |
1075 | struct vif_device *v; | |
1076 | int ct; | |
1077 | if (event != NETDEV_UNREGISTER) | |
1078 | return NOTIFY_DONE; | |
1079 | v=&vif_table[0]; | |
1080 | for(ct=0;ct<maxvif;ct++,v++) { | |
1081 | if (v->dev==ptr) | |
1082 | vif_delete(ct); | |
1083 | } | |
1084 | return NOTIFY_DONE; | |
1085 | } | |
1086 | ||
1087 | ||
1088 | static struct notifier_block ip_mr_notifier={ | |
1089 | .notifier_call = ipmr_device_event, | |
1090 | }; | |
1091 | ||
1092 | /* | |
1093 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1094 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1095 | * important for multicast video. | |
1096 | */ | |
1097 | ||
1098 | static void ip_encap(struct sk_buff *skb, u32 saddr, u32 daddr) | |
1099 | { | |
1100 | struct iphdr *iph = (struct iphdr *)skb_push(skb,sizeof(struct iphdr)); | |
1101 | ||
1102 | iph->version = 4; | |
1103 | iph->tos = skb->nh.iph->tos; | |
1104 | iph->ttl = skb->nh.iph->ttl; | |
1105 | iph->frag_off = 0; | |
1106 | iph->daddr = daddr; | |
1107 | iph->saddr = saddr; | |
1108 | iph->protocol = IPPROTO_IPIP; | |
1109 | iph->ihl = 5; | |
1110 | iph->tot_len = htons(skb->len); | |
1111 | ip_select_ident(iph, skb->dst, NULL); | |
1112 | ip_send_check(iph); | |
1113 | ||
1114 | skb->h.ipiph = skb->nh.iph; | |
1115 | skb->nh.iph = iph; | |
1116 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
1117 | nf_reset(skb); | |
1118 | } | |
1119 | ||
1120 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1121 | { | |
1122 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1123 | ||
1124 | IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
1125 | ||
1126 | if (unlikely(opt->optlen)) | |
1127 | ip_forward_options(skb); | |
1128 | ||
1129 | return dst_output(skb); | |
1130 | } | |
1131 | ||
1132 | /* | |
1133 | * Processing handlers for ipmr_forward | |
1134 | */ | |
1135 | ||
1136 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1137 | { | |
1138 | struct iphdr *iph = skb->nh.iph; | |
1139 | struct vif_device *vif = &vif_table[vifi]; | |
1140 | struct net_device *dev; | |
1141 | struct rtable *rt; | |
1142 | int encap = 0; | |
1143 | ||
1144 | if (vif->dev == NULL) | |
1145 | goto out_free; | |
1146 | ||
1147 | #ifdef CONFIG_IP_PIMSM | |
1148 | if (vif->flags & VIFF_REGISTER) { | |
1149 | vif->pkt_out++; | |
1150 | vif->bytes_out+=skb->len; | |
1151 | ((struct net_device_stats*)vif->dev->priv)->tx_bytes += skb->len; | |
1152 | ((struct net_device_stats*)vif->dev->priv)->tx_packets++; | |
1153 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); | |
1154 | kfree_skb(skb); | |
1155 | return; | |
1156 | } | |
1157 | #endif | |
1158 | ||
1159 | if (vif->flags&VIFF_TUNNEL) { | |
1160 | struct flowi fl = { .oif = vif->link, | |
1161 | .nl_u = { .ip4_u = | |
1162 | { .daddr = vif->remote, | |
1163 | .saddr = vif->local, | |
1164 | .tos = RT_TOS(iph->tos) } }, | |
1165 | .proto = IPPROTO_IPIP }; | |
1166 | if (ip_route_output_key(&rt, &fl)) | |
1167 | goto out_free; | |
1168 | encap = sizeof(struct iphdr); | |
1169 | } else { | |
1170 | struct flowi fl = { .oif = vif->link, | |
1171 | .nl_u = { .ip4_u = | |
1172 | { .daddr = iph->daddr, | |
1173 | .tos = RT_TOS(iph->tos) } }, | |
1174 | .proto = IPPROTO_IPIP }; | |
1175 | if (ip_route_output_key(&rt, &fl)) | |
1176 | goto out_free; | |
1177 | } | |
1178 | ||
1179 | dev = rt->u.dst.dev; | |
1180 | ||
1181 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1182 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1183 | allow to send ICMP, so that packets will disappear | |
1184 | to blackhole. | |
1185 | */ | |
1186 | ||
1187 | IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
1188 | ip_rt_put(rt); | |
1189 | goto out_free; | |
1190 | } | |
1191 | ||
1192 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1193 | ||
1194 | if (skb_cow(skb, encap)) { | |
1195 | ip_rt_put(rt); | |
1196 | goto out_free; | |
1197 | } | |
1198 | ||
1199 | vif->pkt_out++; | |
1200 | vif->bytes_out+=skb->len; | |
1201 | ||
1202 | dst_release(skb->dst); | |
1203 | skb->dst = &rt->u.dst; | |
1204 | iph = skb->nh.iph; | |
1205 | ip_decrease_ttl(iph); | |
1206 | ||
1207 | /* FIXME: forward and output firewalls used to be called here. | |
1208 | * What do we do with netfilter? -- RR */ | |
1209 | if (vif->flags & VIFF_TUNNEL) { | |
1210 | ip_encap(skb, vif->local, vif->remote); | |
1211 | /* FIXME: extra output firewall step used to be here. --RR */ | |
1212 | ((struct ip_tunnel *)vif->dev->priv)->stat.tx_packets++; | |
1213 | ((struct ip_tunnel *)vif->dev->priv)->stat.tx_bytes+=skb->len; | |
1214 | } | |
1215 | ||
1216 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1217 | ||
1218 | /* | |
1219 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1220 | * not only before forwarding, but after forwarding on all output | |
1221 | * interfaces. It is clear, if mrouter runs a multicasting | |
1222 | * program, it should receive packets not depending to what interface | |
1223 | * program is joined. | |
1224 | * If we will not make it, the program will have to join on all | |
1225 | * interfaces. On the other hand, multihoming host (or router, but | |
1226 | * not mrouter) cannot join to more than one interface - it will | |
1227 | * result in receiving multiple packets. | |
1228 | */ | |
1229 | NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, | |
1230 | ipmr_forward_finish); | |
1231 | return; | |
1232 | ||
1233 | out_free: | |
1234 | kfree_skb(skb); | |
1235 | return; | |
1236 | } | |
1237 | ||
1238 | static int ipmr_find_vif(struct net_device *dev) | |
1239 | { | |
1240 | int ct; | |
1241 | for (ct=maxvif-1; ct>=0; ct--) { | |
1242 | if (vif_table[ct].dev == dev) | |
1243 | break; | |
1244 | } | |
1245 | return ct; | |
1246 | } | |
1247 | ||
1248 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1249 | ||
1250 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1251 | { | |
1252 | int psend = -1; | |
1253 | int vif, ct; | |
1254 | ||
1255 | vif = cache->mfc_parent; | |
1256 | cache->mfc_un.res.pkt++; | |
1257 | cache->mfc_un.res.bytes += skb->len; | |
1258 | ||
1259 | /* | |
1260 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1261 | */ | |
1262 | if (vif_table[vif].dev != skb->dev) { | |
1263 | int true_vifi; | |
1264 | ||
1265 | if (((struct rtable*)skb->dst)->fl.iif == 0) { | |
1266 | /* It is our own packet, looped back. | |
1267 | Very complicated situation... | |
1268 | ||
1269 | The best workaround until routing daemons will be | |
1270 | fixed is not to redistribute packet, if it was | |
1271 | send through wrong interface. It means, that | |
1272 | multicast applications WILL NOT work for | |
1273 | (S,G), which have default multicast route pointing | |
1274 | to wrong oif. In any case, it is not a good | |
1275 | idea to use multicasting applications on router. | |
1276 | */ | |
1277 | goto dont_forward; | |
1278 | } | |
1279 | ||
1280 | cache->mfc_un.res.wrong_if++; | |
1281 | true_vifi = ipmr_find_vif(skb->dev); | |
1282 | ||
1283 | if (true_vifi >= 0 && mroute_do_assert && | |
1284 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1285 | so that we cannot check that packet arrived on an oif. | |
1286 | It is bad, but otherwise we would need to move pretty | |
1287 | large chunk of pimd to kernel. Ough... --ANK | |
1288 | */ | |
1289 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
1290 | time_after(jiffies, | |
1291 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1292 | cache->mfc_un.res.last_assert = jiffies; | |
1293 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1294 | } | |
1295 | goto dont_forward; | |
1296 | } | |
1297 | ||
1298 | vif_table[vif].pkt_in++; | |
1299 | vif_table[vif].bytes_in+=skb->len; | |
1300 | ||
1301 | /* | |
1302 | * Forward the frame | |
1303 | */ | |
1304 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1305 | if (skb->nh.iph->ttl > cache->mfc_un.res.ttls[ct]) { | |
1306 | if (psend != -1) { | |
1307 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1308 | if (skb2) | |
1309 | ipmr_queue_xmit(skb2, cache, psend); | |
1310 | } | |
1311 | psend=ct; | |
1312 | } | |
1313 | } | |
1314 | if (psend != -1) { | |
1315 | if (local) { | |
1316 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1317 | if (skb2) | |
1318 | ipmr_queue_xmit(skb2, cache, psend); | |
1319 | } else { | |
1320 | ipmr_queue_xmit(skb, cache, psend); | |
1321 | return 0; | |
1322 | } | |
1323 | } | |
1324 | ||
1325 | dont_forward: | |
1326 | if (!local) | |
1327 | kfree_skb(skb); | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | ||
1332 | /* | |
1333 | * Multicast packets for forwarding arrive here | |
1334 | */ | |
1335 | ||
1336 | int ip_mr_input(struct sk_buff *skb) | |
1337 | { | |
1338 | struct mfc_cache *cache; | |
1339 | int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; | |
1340 | ||
1341 | /* Packet is looped back after forward, it should not be | |
1342 | forwarded second time, but still can be delivered locally. | |
1343 | */ | |
1344 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1345 | goto dont_forward; | |
1346 | ||
1347 | if (!local) { | |
1348 | if (IPCB(skb)->opt.router_alert) { | |
1349 | if (ip_call_ra_chain(skb)) | |
1350 | return 0; | |
1351 | } else if (skb->nh.iph->protocol == IPPROTO_IGMP){ | |
1352 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1353 | Cisco IOS <= 11.2(8)) do not put router alert | |
1354 | option to IGMP packets destined to routable | |
1355 | groups. It is very bad, because it means | |
1356 | that we can forward NO IGMP messages. | |
1357 | */ | |
1358 | read_lock(&mrt_lock); | |
1359 | if (mroute_socket) { | |
2715bcf9 | 1360 | nf_reset(skb); |
1da177e4 LT |
1361 | raw_rcv(mroute_socket, skb); |
1362 | read_unlock(&mrt_lock); | |
1363 | return 0; | |
1364 | } | |
1365 | read_unlock(&mrt_lock); | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | read_lock(&mrt_lock); | |
1370 | cache = ipmr_cache_find(skb->nh.iph->saddr, skb->nh.iph->daddr); | |
1371 | ||
1372 | /* | |
1373 | * No usable cache entry | |
1374 | */ | |
1375 | if (cache==NULL) { | |
1376 | int vif; | |
1377 | ||
1378 | if (local) { | |
1379 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1380 | ip_local_deliver(skb); | |
1381 | if (skb2 == NULL) { | |
1382 | read_unlock(&mrt_lock); | |
1383 | return -ENOBUFS; | |
1384 | } | |
1385 | skb = skb2; | |
1386 | } | |
1387 | ||
1388 | vif = ipmr_find_vif(skb->dev); | |
1389 | if (vif >= 0) { | |
1390 | int err = ipmr_cache_unresolved(vif, skb); | |
1391 | read_unlock(&mrt_lock); | |
1392 | ||
1393 | return err; | |
1394 | } | |
1395 | read_unlock(&mrt_lock); | |
1396 | kfree_skb(skb); | |
1397 | return -ENODEV; | |
1398 | } | |
1399 | ||
1400 | ip_mr_forward(skb, cache, local); | |
1401 | ||
1402 | read_unlock(&mrt_lock); | |
1403 | ||
1404 | if (local) | |
1405 | return ip_local_deliver(skb); | |
1406 | ||
1407 | return 0; | |
1408 | ||
1409 | dont_forward: | |
1410 | if (local) | |
1411 | return ip_local_deliver(skb); | |
1412 | kfree_skb(skb); | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | #ifdef CONFIG_IP_PIMSM_V1 | |
1417 | /* | |
1418 | * Handle IGMP messages of PIMv1 | |
1419 | */ | |
1420 | ||
1421 | int pim_rcv_v1(struct sk_buff * skb) | |
1422 | { | |
1423 | struct igmphdr *pim; | |
1424 | struct iphdr *encap; | |
1425 | struct net_device *reg_dev = NULL; | |
1426 | ||
1427 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
1428 | goto drop; | |
1429 | ||
1430 | pim = (struct igmphdr*)skb->h.raw; | |
1431 | ||
1432 | if (!mroute_do_pim || | |
1433 | skb->len < sizeof(*pim) + sizeof(*encap) || | |
1434 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) | |
1435 | goto drop; | |
1436 | ||
1437 | encap = (struct iphdr*)(skb->h.raw + sizeof(struct igmphdr)); | |
1438 | /* | |
1439 | Check that: | |
1440 | a. packet is really destinted to a multicast group | |
1441 | b. packet is not a NULL-REGISTER | |
1442 | c. packet is not truncated | |
1443 | */ | |
1444 | if (!MULTICAST(encap->daddr) || | |
1445 | encap->tot_len == 0 || | |
1446 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) | |
1447 | goto drop; | |
1448 | ||
1449 | read_lock(&mrt_lock); | |
1450 | if (reg_vif_num >= 0) | |
1451 | reg_dev = vif_table[reg_vif_num].dev; | |
1452 | if (reg_dev) | |
1453 | dev_hold(reg_dev); | |
1454 | read_unlock(&mrt_lock); | |
1455 | ||
1456 | if (reg_dev == NULL) | |
1457 | goto drop; | |
1458 | ||
1459 | skb->mac.raw = skb->nh.raw; | |
1460 | skb_pull(skb, (u8*)encap - skb->data); | |
1461 | skb->nh.iph = (struct iphdr *)skb->data; | |
1462 | skb->dev = reg_dev; | |
1463 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); | |
1464 | skb->protocol = htons(ETH_P_IP); | |
1465 | skb->ip_summed = 0; | |
1466 | skb->pkt_type = PACKET_HOST; | |
1467 | dst_release(skb->dst); | |
1468 | skb->dst = NULL; | |
1469 | ((struct net_device_stats*)reg_dev->priv)->rx_bytes += skb->len; | |
1470 | ((struct net_device_stats*)reg_dev->priv)->rx_packets++; | |
1471 | nf_reset(skb); | |
1472 | netif_rx(skb); | |
1473 | dev_put(reg_dev); | |
1474 | return 0; | |
1475 | drop: | |
1476 | kfree_skb(skb); | |
1477 | return 0; | |
1478 | } | |
1479 | #endif | |
1480 | ||
1481 | #ifdef CONFIG_IP_PIMSM_V2 | |
1482 | static int pim_rcv(struct sk_buff * skb) | |
1483 | { | |
1484 | struct pimreghdr *pim; | |
1485 | struct iphdr *encap; | |
1486 | struct net_device *reg_dev = NULL; | |
1487 | ||
1488 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
1489 | goto drop; | |
1490 | ||
1491 | pim = (struct pimreghdr*)skb->h.raw; | |
1492 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || | |
1493 | (pim->flags&PIM_NULL_REGISTER) || | |
1494 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && | |
1495 | (u16)csum_fold(skb_checksum(skb, 0, skb->len, 0)))) | |
1496 | goto drop; | |
1497 | ||
1498 | /* check if the inner packet is destined to mcast group */ | |
1499 | encap = (struct iphdr*)(skb->h.raw + sizeof(struct pimreghdr)); | |
1500 | if (!MULTICAST(encap->daddr) || | |
1501 | encap->tot_len == 0 || | |
1502 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) | |
1503 | goto drop; | |
1504 | ||
1505 | read_lock(&mrt_lock); | |
1506 | if (reg_vif_num >= 0) | |
1507 | reg_dev = vif_table[reg_vif_num].dev; | |
1508 | if (reg_dev) | |
1509 | dev_hold(reg_dev); | |
1510 | read_unlock(&mrt_lock); | |
1511 | ||
1512 | if (reg_dev == NULL) | |
1513 | goto drop; | |
1514 | ||
1515 | skb->mac.raw = skb->nh.raw; | |
1516 | skb_pull(skb, (u8*)encap - skb->data); | |
1517 | skb->nh.iph = (struct iphdr *)skb->data; | |
1518 | skb->dev = reg_dev; | |
1519 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); | |
1520 | skb->protocol = htons(ETH_P_IP); | |
1521 | skb->ip_summed = 0; | |
1522 | skb->pkt_type = PACKET_HOST; | |
1523 | dst_release(skb->dst); | |
1524 | ((struct net_device_stats*)reg_dev->priv)->rx_bytes += skb->len; | |
1525 | ((struct net_device_stats*)reg_dev->priv)->rx_packets++; | |
1526 | skb->dst = NULL; | |
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 | static int | |
1538 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1539 | { | |
1540 | int ct; | |
1541 | struct rtnexthop *nhp; | |
1542 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
1543 | u8 *b = skb->tail; | |
1544 | struct rtattr *mp_head; | |
1545 | ||
1546 | if (dev) | |
1547 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1548 | ||
1549 | mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); | |
1550 | ||
1551 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1552 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1553 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1554 | goto rtattr_failure; | |
1555 | nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1556 | nhp->rtnh_flags = 0; | |
1557 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1558 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1559 | nhp->rtnh_len = sizeof(*nhp); | |
1560 | } | |
1561 | } | |
1562 | mp_head->rta_type = RTA_MULTIPATH; | |
1563 | mp_head->rta_len = skb->tail - (u8*)mp_head; | |
1564 | rtm->rtm_type = RTN_MULTICAST; | |
1565 | return 1; | |
1566 | ||
1567 | rtattr_failure: | |
1568 | skb_trim(skb, b - skb->data); | |
1569 | return -EMSGSIZE; | |
1570 | } | |
1571 | ||
1572 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1573 | { | |
1574 | int err; | |
1575 | struct mfc_cache *cache; | |
1576 | struct rtable *rt = (struct rtable*)skb->dst; | |
1577 | ||
1578 | read_lock(&mrt_lock); | |
1579 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1580 | ||
1581 | if (cache==NULL) { | |
1582 | struct net_device *dev; | |
1583 | int vif; | |
1584 | ||
1585 | if (nowait) { | |
1586 | read_unlock(&mrt_lock); | |
1587 | return -EAGAIN; | |
1588 | } | |
1589 | ||
1590 | dev = skb->dev; | |
1591 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1592 | read_unlock(&mrt_lock); | |
1593 | return -ENODEV; | |
1594 | } | |
1595 | skb->nh.raw = skb_push(skb, sizeof(struct iphdr)); | |
1596 | skb->nh.iph->ihl = sizeof(struct iphdr)>>2; | |
1597 | skb->nh.iph->saddr = rt->rt_src; | |
1598 | skb->nh.iph->daddr = rt->rt_dst; | |
1599 | skb->nh.iph->version = 0; | |
1600 | err = ipmr_cache_unresolved(vif, skb); | |
1601 | read_unlock(&mrt_lock); | |
1602 | return err; | |
1603 | } | |
1604 | ||
1605 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1606 | cache->mfc_flags |= MFC_NOTIFY; | |
1607 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1608 | read_unlock(&mrt_lock); | |
1609 | return err; | |
1610 | } | |
1611 | ||
1612 | #ifdef CONFIG_PROC_FS | |
1613 | /* | |
1614 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1615 | */ | |
1616 | struct ipmr_vif_iter { | |
1617 | int ct; | |
1618 | }; | |
1619 | ||
1620 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1621 | loff_t pos) | |
1622 | { | |
1623 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
1624 | if(!VIF_EXISTS(iter->ct)) | |
1625 | continue; | |
1626 | if (pos-- == 0) | |
1627 | return &vif_table[iter->ct]; | |
1628 | } | |
1629 | return NULL; | |
1630 | } | |
1631 | ||
1632 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
1633 | { | |
1634 | read_lock(&mrt_lock); | |
1635 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) | |
1636 | : SEQ_START_TOKEN; | |
1637 | } | |
1638 | ||
1639 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1640 | { | |
1641 | struct ipmr_vif_iter *iter = seq->private; | |
1642 | ||
1643 | ++*pos; | |
1644 | if (v == SEQ_START_TOKEN) | |
1645 | return ipmr_vif_seq_idx(iter, 0); | |
1646 | ||
1647 | while (++iter->ct < maxvif) { | |
1648 | if(!VIF_EXISTS(iter->ct)) | |
1649 | continue; | |
1650 | return &vif_table[iter->ct]; | |
1651 | } | |
1652 | return NULL; | |
1653 | } | |
1654 | ||
1655 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
1656 | { | |
1657 | read_unlock(&mrt_lock); | |
1658 | } | |
1659 | ||
1660 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1661 | { | |
1662 | if (v == SEQ_START_TOKEN) { | |
1663 | seq_puts(seq, | |
1664 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); | |
1665 | } else { | |
1666 | const struct vif_device *vif = v; | |
1667 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1668 | ||
1669 | seq_printf(seq, | |
1670 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1671 | vif - vif_table, | |
1672 | name, vif->bytes_in, vif->pkt_in, | |
1673 | vif->bytes_out, vif->pkt_out, | |
1674 | vif->flags, vif->local, vif->remote); | |
1675 | } | |
1676 | return 0; | |
1677 | } | |
1678 | ||
1679 | static struct seq_operations ipmr_vif_seq_ops = { | |
1680 | .start = ipmr_vif_seq_start, | |
1681 | .next = ipmr_vif_seq_next, | |
1682 | .stop = ipmr_vif_seq_stop, | |
1683 | .show = ipmr_vif_seq_show, | |
1684 | }; | |
1685 | ||
1686 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1687 | { | |
1688 | struct seq_file *seq; | |
1689 | int rc = -ENOMEM; | |
1690 | struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1691 | ||
1692 | if (!s) | |
1693 | goto out; | |
1694 | ||
1695 | rc = seq_open(file, &ipmr_vif_seq_ops); | |
1696 | if (rc) | |
1697 | goto out_kfree; | |
1698 | ||
1699 | s->ct = 0; | |
1700 | seq = file->private_data; | |
1701 | seq->private = s; | |
1702 | out: | |
1703 | return rc; | |
1704 | out_kfree: | |
1705 | kfree(s); | |
1706 | goto out; | |
1707 | ||
1708 | } | |
1709 | ||
1710 | static struct file_operations ipmr_vif_fops = { | |
1711 | .owner = THIS_MODULE, | |
1712 | .open = ipmr_vif_open, | |
1713 | .read = seq_read, | |
1714 | .llseek = seq_lseek, | |
1715 | .release = seq_release_private, | |
1716 | }; | |
1717 | ||
1718 | struct ipmr_mfc_iter { | |
1719 | struct mfc_cache **cache; | |
1720 | int ct; | |
1721 | }; | |
1722 | ||
1723 | ||
1724 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1725 | { | |
1726 | struct mfc_cache *mfc; | |
1727 | ||
1728 | it->cache = mfc_cache_array; | |
1729 | read_lock(&mrt_lock); | |
1730 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) | |
1731 | for(mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) | |
1732 | if (pos-- == 0) | |
1733 | return mfc; | |
1734 | read_unlock(&mrt_lock); | |
1735 | ||
1736 | it->cache = &mfc_unres_queue; | |
1737 | spin_lock_bh(&mfc_unres_lock); | |
1738 | for(mfc = mfc_unres_queue; mfc; mfc = mfc->next) | |
1739 | if (pos-- == 0) | |
1740 | return mfc; | |
1741 | spin_unlock_bh(&mfc_unres_lock); | |
1742 | ||
1743 | it->cache = NULL; | |
1744 | return NULL; | |
1745 | } | |
1746 | ||
1747 | ||
1748 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1749 | { | |
1750 | struct ipmr_mfc_iter *it = seq->private; | |
1751 | it->cache = NULL; | |
1752 | it->ct = 0; | |
1753 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) | |
1754 | : SEQ_START_TOKEN; | |
1755 | } | |
1756 | ||
1757 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1758 | { | |
1759 | struct mfc_cache *mfc = v; | |
1760 | struct ipmr_mfc_iter *it = seq->private; | |
1761 | ||
1762 | ++*pos; | |
1763 | ||
1764 | if (v == SEQ_START_TOKEN) | |
1765 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1766 | ||
1767 | if (mfc->next) | |
1768 | return mfc->next; | |
1769 | ||
1770 | if (it->cache == &mfc_unres_queue) | |
1771 | goto end_of_list; | |
1772 | ||
1773 | BUG_ON(it->cache != mfc_cache_array); | |
1774 | ||
1775 | while (++it->ct < MFC_LINES) { | |
1776 | mfc = mfc_cache_array[it->ct]; | |
1777 | if (mfc) | |
1778 | return mfc; | |
1779 | } | |
1780 | ||
1781 | /* exhausted cache_array, show unresolved */ | |
1782 | read_unlock(&mrt_lock); | |
1783 | it->cache = &mfc_unres_queue; | |
1784 | it->ct = 0; | |
1785 | ||
1786 | spin_lock_bh(&mfc_unres_lock); | |
1787 | mfc = mfc_unres_queue; | |
1788 | if (mfc) | |
1789 | return mfc; | |
1790 | ||
1791 | end_of_list: | |
1792 | spin_unlock_bh(&mfc_unres_lock); | |
1793 | it->cache = NULL; | |
1794 | ||
1795 | return NULL; | |
1796 | } | |
1797 | ||
1798 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1799 | { | |
1800 | struct ipmr_mfc_iter *it = seq->private; | |
1801 | ||
1802 | if (it->cache == &mfc_unres_queue) | |
1803 | spin_unlock_bh(&mfc_unres_lock); | |
1804 | else if (it->cache == mfc_cache_array) | |
1805 | read_unlock(&mrt_lock); | |
1806 | } | |
1807 | ||
1808 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1809 | { | |
1810 | int n; | |
1811 | ||
1812 | if (v == SEQ_START_TOKEN) { | |
1813 | seq_puts(seq, | |
1814 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); | |
1815 | } else { | |
1816 | const struct mfc_cache *mfc = v; | |
1817 | const struct ipmr_mfc_iter *it = seq->private; | |
1818 | ||
1819 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", | |
1820 | (unsigned long) mfc->mfc_mcastgrp, | |
1821 | (unsigned long) mfc->mfc_origin, | |
1822 | mfc->mfc_parent, | |
1823 | mfc->mfc_un.res.pkt, | |
1824 | mfc->mfc_un.res.bytes, | |
1825 | mfc->mfc_un.res.wrong_if); | |
1826 | ||
1827 | if (it->cache != &mfc_unres_queue) { | |
1828 | for(n = mfc->mfc_un.res.minvif; | |
1829 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1830 | if(VIF_EXISTS(n) | |
1831 | && mfc->mfc_un.res.ttls[n] < 255) | |
1832 | seq_printf(seq, | |
1833 | " %2d:%-3d", | |
1834 | n, mfc->mfc_un.res.ttls[n]); | |
1835 | } | |
1836 | } | |
1837 | seq_putc(seq, '\n'); | |
1838 | } | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | static struct seq_operations ipmr_mfc_seq_ops = { | |
1843 | .start = ipmr_mfc_seq_start, | |
1844 | .next = ipmr_mfc_seq_next, | |
1845 | .stop = ipmr_mfc_seq_stop, | |
1846 | .show = ipmr_mfc_seq_show, | |
1847 | }; | |
1848 | ||
1849 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1850 | { | |
1851 | struct seq_file *seq; | |
1852 | int rc = -ENOMEM; | |
1853 | struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1854 | ||
1855 | if (!s) | |
1856 | goto out; | |
1857 | ||
1858 | rc = seq_open(file, &ipmr_mfc_seq_ops); | |
1859 | if (rc) | |
1860 | goto out_kfree; | |
1861 | ||
1862 | seq = file->private_data; | |
1863 | seq->private = s; | |
1864 | out: | |
1865 | return rc; | |
1866 | out_kfree: | |
1867 | kfree(s); | |
1868 | goto out; | |
1869 | ||
1870 | } | |
1871 | ||
1872 | static struct file_operations ipmr_mfc_fops = { | |
1873 | .owner = THIS_MODULE, | |
1874 | .open = ipmr_mfc_open, | |
1875 | .read = seq_read, | |
1876 | .llseek = seq_lseek, | |
1877 | .release = seq_release_private, | |
1878 | }; | |
1879 | #endif | |
1880 | ||
1881 | #ifdef CONFIG_IP_PIMSM_V2 | |
1882 | static struct net_protocol pim_protocol = { | |
1883 | .handler = pim_rcv, | |
1884 | }; | |
1885 | #endif | |
1886 | ||
1887 | ||
1888 | /* | |
1889 | * Setup for IP multicast routing | |
1890 | */ | |
1891 | ||
1892 | void __init ip_mr_init(void) | |
1893 | { | |
1894 | mrt_cachep = kmem_cache_create("ip_mrt_cache", | |
1895 | sizeof(struct mfc_cache), | |
1896 | 0, SLAB_HWCACHE_ALIGN, | |
1897 | NULL, NULL); | |
1898 | if (!mrt_cachep) | |
1899 | panic("cannot allocate ip_mrt_cache"); | |
1900 | ||
1901 | init_timer(&ipmr_expire_timer); | |
1902 | ipmr_expire_timer.function=ipmr_expire_process; | |
1903 | register_netdevice_notifier(&ip_mr_notifier); | |
1904 | #ifdef CONFIG_PROC_FS | |
1905 | proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops); | |
1906 | proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops); | |
1907 | #endif | |
1908 | } |