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> | |
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> | |
64 | ||
65 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
66 | #define CONFIG_IP_PIMSM 1 | |
67 | #endif | |
68 | ||
69 | static struct sock *mroute_socket; | |
70 | ||
71 | ||
72 | /* Big lock, protecting vif table, mrt cache and mroute socket state. | |
73 | Note that the changes are semaphored via rtnl_lock. | |
74 | */ | |
75 | ||
76 | static DEFINE_RWLOCK(mrt_lock); | |
77 | ||
78 | /* | |
79 | * Multicast router control variables | |
80 | */ | |
81 | ||
82 | static struct vif_device vif_table[MAXVIFS]; /* Devices */ | |
83 | static int maxvif; | |
84 | ||
85 | #define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) | |
86 | ||
87 | static int mroute_do_assert; /* Set in PIM assert */ | |
88 | static int mroute_do_pim; | |
89 | ||
90 | static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ | |
91 | ||
92 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ | |
93 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ | |
94 | ||
95 | /* Special spinlock for queue of unresolved entries */ | |
96 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
97 | ||
98 | /* We return to original Alan's scheme. Hash table of resolved | |
99 | entries is changed only in process context and protected | |
100 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
101 | with strong spinlock mfc_unres_lock. | |
102 | ||
103 | In this case data path is free of exclusive locks at all. | |
104 | */ | |
105 | ||
106 | static kmem_cache_t *mrt_cachep; | |
107 | ||
108 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
109 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
110 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
111 | ||
112 | #ifdef CONFIG_IP_PIMSM_V2 | |
113 | static struct net_protocol pim_protocol; | |
114 | #endif | |
115 | ||
116 | static struct timer_list ipmr_expire_timer; | |
117 | ||
118 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
119 | ||
120 | static | |
121 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
122 | { | |
123 | struct net_device *dev; | |
124 | ||
125 | dev = __dev_get_by_name("tunl0"); | |
126 | ||
127 | if (dev) { | |
128 | int err; | |
129 | struct ifreq ifr; | |
130 | mm_segment_t oldfs; | |
131 | struct ip_tunnel_parm p; | |
132 | struct in_device *in_dev; | |
133 | ||
134 | memset(&p, 0, sizeof(p)); | |
135 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
136 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
137 | p.iph.version = 4; | |
138 | p.iph.ihl = 5; | |
139 | p.iph.protocol = IPPROTO_IPIP; | |
140 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
141 | ifr.ifr_ifru.ifru_data = (void*)&p; | |
142 | ||
143 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
144 | err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
145 | set_fs(oldfs); | |
146 | ||
147 | dev = NULL; | |
148 | ||
149 | if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) { | |
150 | dev->flags |= IFF_MULTICAST; | |
151 | ||
152 | in_dev = __in_dev_get(dev); | |
153 | if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL) | |
154 | goto failure; | |
155 | in_dev->cnf.rp_filter = 0; | |
156 | ||
157 | if (dev_open(dev)) | |
158 | goto failure; | |
159 | } | |
160 | } | |
161 | return dev; | |
162 | ||
163 | failure: | |
164 | /* allow the register to be completed before unregistering. */ | |
165 | rtnl_unlock(); | |
166 | rtnl_lock(); | |
167 | ||
168 | unregister_netdevice(dev); | |
169 | return NULL; | |
170 | } | |
171 | ||
172 | #ifdef CONFIG_IP_PIMSM | |
173 | ||
174 | static int reg_vif_num = -1; | |
175 | ||
176 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
177 | { | |
178 | read_lock(&mrt_lock); | |
179 | ((struct net_device_stats*)dev->priv)->tx_bytes += skb->len; | |
180 | ((struct net_device_stats*)dev->priv)->tx_packets++; | |
181 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); | |
182 | read_unlock(&mrt_lock); | |
183 | kfree_skb(skb); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static struct net_device_stats *reg_vif_get_stats(struct net_device *dev) | |
188 | { | |
189 | return (struct net_device_stats*)dev->priv; | |
190 | } | |
191 | ||
192 | static void reg_vif_setup(struct net_device *dev) | |
193 | { | |
194 | dev->type = ARPHRD_PIMREG; | |
195 | dev->mtu = 1500 - sizeof(struct iphdr) - 8; | |
196 | dev->flags = IFF_NOARP; | |
197 | dev->hard_start_xmit = reg_vif_xmit; | |
198 | dev->get_stats = reg_vif_get_stats; | |
199 | dev->destructor = free_netdev; | |
200 | } | |
201 | ||
202 | static struct net_device *ipmr_reg_vif(void) | |
203 | { | |
204 | struct net_device *dev; | |
205 | struct in_device *in_dev; | |
206 | ||
207 | dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg", | |
208 | reg_vif_setup); | |
209 | ||
210 | if (dev == NULL) | |
211 | return NULL; | |
212 | ||
213 | if (register_netdevice(dev)) { | |
214 | free_netdev(dev); | |
215 | return NULL; | |
216 | } | |
217 | dev->iflink = 0; | |
218 | ||
219 | if ((in_dev = inetdev_init(dev)) == NULL) | |
220 | goto failure; | |
221 | ||
222 | in_dev->cnf.rp_filter = 0; | |
223 | ||
224 | if (dev_open(dev)) | |
225 | goto failure; | |
226 | ||
227 | return dev; | |
228 | ||
229 | failure: | |
230 | /* allow the register to be completed before unregistering. */ | |
231 | rtnl_unlock(); | |
232 | rtnl_lock(); | |
233 | ||
234 | unregister_netdevice(dev); | |
235 | return NULL; | |
236 | } | |
237 | #endif | |
238 | ||
239 | /* | |
240 | * Delete a VIF entry | |
241 | */ | |
242 | ||
243 | static int vif_delete(int vifi) | |
244 | { | |
245 | struct vif_device *v; | |
246 | struct net_device *dev; | |
247 | struct in_device *in_dev; | |
248 | ||
249 | if (vifi < 0 || vifi >= maxvif) | |
250 | return -EADDRNOTAVAIL; | |
251 | ||
252 | v = &vif_table[vifi]; | |
253 | ||
254 | write_lock_bh(&mrt_lock); | |
255 | dev = v->dev; | |
256 | v->dev = NULL; | |
257 | ||
258 | if (!dev) { | |
259 | write_unlock_bh(&mrt_lock); | |
260 | return -EADDRNOTAVAIL; | |
261 | } | |
262 | ||
263 | #ifdef CONFIG_IP_PIMSM | |
264 | if (vifi == reg_vif_num) | |
265 | reg_vif_num = -1; | |
266 | #endif | |
267 | ||
268 | if (vifi+1 == maxvif) { | |
269 | int tmp; | |
270 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
271 | if (VIF_EXISTS(tmp)) | |
272 | break; | |
273 | } | |
274 | maxvif = tmp+1; | |
275 | } | |
276 | ||
277 | write_unlock_bh(&mrt_lock); | |
278 | ||
279 | dev_set_allmulti(dev, -1); | |
280 | ||
281 | if ((in_dev = __in_dev_get(dev)) != NULL) { | |
282 | in_dev->cnf.mc_forwarding--; | |
283 | ip_rt_multicast_event(in_dev); | |
284 | } | |
285 | ||
286 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
287 | unregister_netdevice(dev); | |
288 | ||
289 | dev_put(dev); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | /* Destroy an unresolved cache entry, killing queued skbs | |
294 | and reporting error to netlink readers. | |
295 | */ | |
296 | ||
297 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
298 | { | |
299 | struct sk_buff *skb; | |
300 | ||
301 | atomic_dec(&cache_resolve_queue_len); | |
302 | ||
303 | while((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { | |
304 | if (skb->nh.iph->version == 0) { | |
305 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); | |
306 | nlh->nlmsg_type = NLMSG_ERROR; | |
307 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
308 | skb_trim(skb, nlh->nlmsg_len); | |
309 | ((struct nlmsgerr*)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
310 | netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); | |
311 | } else | |
312 | kfree_skb(skb); | |
313 | } | |
314 | ||
315 | kmem_cache_free(mrt_cachep, c); | |
316 | } | |
317 | ||
318 | ||
319 | /* Single timer process for all the unresolved queue. */ | |
320 | ||
321 | static void ipmr_expire_process(unsigned long dummy) | |
322 | { | |
323 | unsigned long now; | |
324 | unsigned long expires; | |
325 | struct mfc_cache *c, **cp; | |
326 | ||
327 | if (!spin_trylock(&mfc_unres_lock)) { | |
328 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
329 | return; | |
330 | } | |
331 | ||
332 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
333 | goto out; | |
334 | ||
335 | now = jiffies; | |
336 | expires = 10*HZ; | |
337 | cp = &mfc_unres_queue; | |
338 | ||
339 | while ((c=*cp) != NULL) { | |
340 | if (time_after(c->mfc_un.unres.expires, now)) { | |
341 | unsigned long interval = c->mfc_un.unres.expires - now; | |
342 | if (interval < expires) | |
343 | expires = interval; | |
344 | cp = &c->next; | |
345 | continue; | |
346 | } | |
347 | ||
348 | *cp = c->next; | |
349 | ||
350 | ipmr_destroy_unres(c); | |
351 | } | |
352 | ||
353 | if (atomic_read(&cache_resolve_queue_len)) | |
354 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
355 | ||
356 | out: | |
357 | spin_unlock(&mfc_unres_lock); | |
358 | } | |
359 | ||
360 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
361 | ||
362 | static void ipmr_update_threshoulds(struct mfc_cache *cache, unsigned char *ttls) | |
363 | { | |
364 | int vifi; | |
365 | ||
366 | cache->mfc_un.res.minvif = MAXVIFS; | |
367 | cache->mfc_un.res.maxvif = 0; | |
368 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
369 | ||
370 | for (vifi=0; vifi<maxvif; vifi++) { | |
371 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
372 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
373 | if (cache->mfc_un.res.minvif > vifi) | |
374 | cache->mfc_un.res.minvif = vifi; | |
375 | if (cache->mfc_un.res.maxvif <= vifi) | |
376 | cache->mfc_un.res.maxvif = vifi + 1; | |
377 | } | |
378 | } | |
379 | } | |
380 | ||
381 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
382 | { | |
383 | int vifi = vifc->vifc_vifi; | |
384 | struct vif_device *v = &vif_table[vifi]; | |
385 | struct net_device *dev; | |
386 | struct in_device *in_dev; | |
387 | ||
388 | /* Is vif busy ? */ | |
389 | if (VIF_EXISTS(vifi)) | |
390 | return -EADDRINUSE; | |
391 | ||
392 | switch (vifc->vifc_flags) { | |
393 | #ifdef CONFIG_IP_PIMSM | |
394 | case VIFF_REGISTER: | |
395 | /* | |
396 | * Special Purpose VIF in PIM | |
397 | * All the packets will be sent to the daemon | |
398 | */ | |
399 | if (reg_vif_num >= 0) | |
400 | return -EADDRINUSE; | |
401 | dev = ipmr_reg_vif(); | |
402 | if (!dev) | |
403 | return -ENOBUFS; | |
404 | break; | |
405 | #endif | |
406 | case VIFF_TUNNEL: | |
407 | dev = ipmr_new_tunnel(vifc); | |
408 | if (!dev) | |
409 | return -ENOBUFS; | |
410 | break; | |
411 | case 0: | |
412 | dev=ip_dev_find(vifc->vifc_lcl_addr.s_addr); | |
413 | if (!dev) | |
414 | return -EADDRNOTAVAIL; | |
415 | __dev_put(dev); | |
416 | break; | |
417 | default: | |
418 | return -EINVAL; | |
419 | } | |
420 | ||
421 | if ((in_dev = __in_dev_get(dev)) == NULL) | |
422 | return -EADDRNOTAVAIL; | |
423 | in_dev->cnf.mc_forwarding++; | |
424 | dev_set_allmulti(dev, +1); | |
425 | ip_rt_multicast_event(in_dev); | |
426 | ||
427 | /* | |
428 | * Fill in the VIF structures | |
429 | */ | |
430 | v->rate_limit=vifc->vifc_rate_limit; | |
431 | v->local=vifc->vifc_lcl_addr.s_addr; | |
432 | v->remote=vifc->vifc_rmt_addr.s_addr; | |
433 | v->flags=vifc->vifc_flags; | |
434 | if (!mrtsock) | |
435 | v->flags |= VIFF_STATIC; | |
436 | v->threshold=vifc->vifc_threshold; | |
437 | v->bytes_in = 0; | |
438 | v->bytes_out = 0; | |
439 | v->pkt_in = 0; | |
440 | v->pkt_out = 0; | |
441 | v->link = dev->ifindex; | |
442 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
443 | v->link = dev->iflink; | |
444 | ||
445 | /* And finish update writing critical data */ | |
446 | write_lock_bh(&mrt_lock); | |
447 | dev_hold(dev); | |
448 | v->dev=dev; | |
449 | #ifdef CONFIG_IP_PIMSM | |
450 | if (v->flags&VIFF_REGISTER) | |
451 | reg_vif_num = vifi; | |
452 | #endif | |
453 | if (vifi+1 > maxvif) | |
454 | maxvif = vifi+1; | |
455 | write_unlock_bh(&mrt_lock); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | static struct mfc_cache *ipmr_cache_find(__u32 origin, __u32 mcastgrp) | |
460 | { | |
461 | int line=MFC_HASH(mcastgrp,origin); | |
462 | struct mfc_cache *c; | |
463 | ||
464 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
465 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
466 | break; | |
467 | } | |
468 | return c; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Allocate a multicast cache entry | |
473 | */ | |
474 | static struct mfc_cache *ipmr_cache_alloc(void) | |
475 | { | |
476 | struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_KERNEL); | |
477 | if(c==NULL) | |
478 | return NULL; | |
479 | memset(c, 0, sizeof(*c)); | |
480 | c->mfc_un.res.minvif = MAXVIFS; | |
481 | return c; | |
482 | } | |
483 | ||
484 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
485 | { | |
486 | struct mfc_cache *c=kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); | |
487 | if(c==NULL) | |
488 | return NULL; | |
489 | memset(c, 0, sizeof(*c)); | |
490 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
491 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
492 | return c; | |
493 | } | |
494 | ||
495 | /* | |
496 | * A cache entry has gone into a resolved state from queued | |
497 | */ | |
498 | ||
499 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) | |
500 | { | |
501 | struct sk_buff *skb; | |
502 | ||
503 | /* | |
504 | * Play the pending entries through our router | |
505 | */ | |
506 | ||
507 | while((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
508 | if (skb->nh.iph->version == 0) { | |
509 | int err; | |
510 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); | |
511 | ||
512 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
513 | nlh->nlmsg_len = skb->tail - (u8*)nlh; | |
514 | } else { | |
515 | nlh->nlmsg_type = NLMSG_ERROR; | |
516 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
517 | skb_trim(skb, nlh->nlmsg_len); | |
518 | ((struct nlmsgerr*)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
519 | } | |
520 | err = netlink_unicast(rtnl, skb, NETLINK_CB(skb).dst_pid, MSG_DONTWAIT); | |
521 | } else | |
522 | ip_mr_forward(skb, c, 0); | |
523 | } | |
524 | } | |
525 | ||
526 | /* | |
527 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
528 | * expects the following bizarre scheme. | |
529 | * | |
530 | * Called under mrt_lock. | |
531 | */ | |
532 | ||
533 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) | |
534 | { | |
535 | struct sk_buff *skb; | |
536 | int ihl = pkt->nh.iph->ihl<<2; | |
537 | struct igmphdr *igmp; | |
538 | struct igmpmsg *msg; | |
539 | int ret; | |
540 | ||
541 | #ifdef CONFIG_IP_PIMSM | |
542 | if (assert == IGMPMSG_WHOLEPKT) | |
543 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
544 | else | |
545 | #endif | |
546 | skb = alloc_skb(128, GFP_ATOMIC); | |
547 | ||
548 | if(!skb) | |
549 | return -ENOBUFS; | |
550 | ||
551 | #ifdef CONFIG_IP_PIMSM | |
552 | if (assert == IGMPMSG_WHOLEPKT) { | |
553 | /* Ugly, but we have no choice with this interface. | |
554 | Duplicate old header, fix ihl, length etc. | |
555 | And all this only to mangle msg->im_msgtype and | |
556 | to set msg->im_mbz to "mbz" :-) | |
557 | */ | |
558 | msg = (struct igmpmsg*)skb_push(skb, sizeof(struct iphdr)); | |
559 | skb->nh.raw = skb->h.raw = (u8*)msg; | |
560 | memcpy(msg, pkt->nh.raw, sizeof(struct iphdr)); | |
561 | msg->im_msgtype = IGMPMSG_WHOLEPKT; | |
562 | msg->im_mbz = 0; | |
563 | msg->im_vif = reg_vif_num; | |
564 | skb->nh.iph->ihl = sizeof(struct iphdr) >> 2; | |
565 | skb->nh.iph->tot_len = htons(ntohs(pkt->nh.iph->tot_len) + sizeof(struct iphdr)); | |
566 | } else | |
567 | #endif | |
568 | { | |
569 | ||
570 | /* | |
571 | * Copy the IP header | |
572 | */ | |
573 | ||
574 | skb->nh.iph = (struct iphdr *)skb_put(skb, ihl); | |
575 | memcpy(skb->data,pkt->data,ihl); | |
576 | skb->nh.iph->protocol = 0; /* Flag to the kernel this is a route add */ | |
577 | msg = (struct igmpmsg*)skb->nh.iph; | |
578 | msg->im_vif = vifi; | |
579 | skb->dst = dst_clone(pkt->dst); | |
580 | ||
581 | /* | |
582 | * Add our header | |
583 | */ | |
584 | ||
585 | igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); | |
586 | igmp->type = | |
587 | msg->im_msgtype = assert; | |
588 | igmp->code = 0; | |
589 | skb->nh.iph->tot_len=htons(skb->len); /* Fix the length */ | |
590 | skb->h.raw = skb->nh.raw; | |
591 | } | |
592 | ||
593 | if (mroute_socket == NULL) { | |
594 | kfree_skb(skb); | |
595 | return -EINVAL; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Deliver to mrouted | |
600 | */ | |
601 | if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { | |
602 | if (net_ratelimit()) | |
603 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
604 | kfree_skb(skb); | |
605 | } | |
606 | ||
607 | return ret; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Queue a packet for resolution. It gets locked cache entry! | |
612 | */ | |
613 | ||
614 | static int | |
615 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
616 | { | |
617 | int err; | |
618 | struct mfc_cache *c; | |
619 | ||
620 | spin_lock_bh(&mfc_unres_lock); | |
621 | for (c=mfc_unres_queue; c; c=c->next) { | |
622 | if (c->mfc_mcastgrp == skb->nh.iph->daddr && | |
623 | c->mfc_origin == skb->nh.iph->saddr) | |
624 | break; | |
625 | } | |
626 | ||
627 | if (c == NULL) { | |
628 | /* | |
629 | * Create a new entry if allowable | |
630 | */ | |
631 | ||
632 | if (atomic_read(&cache_resolve_queue_len)>=10 || | |
633 | (c=ipmr_cache_alloc_unres())==NULL) { | |
634 | spin_unlock_bh(&mfc_unres_lock); | |
635 | ||
636 | kfree_skb(skb); | |
637 | return -ENOBUFS; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Fill in the new cache entry | |
642 | */ | |
643 | c->mfc_parent=-1; | |
644 | c->mfc_origin=skb->nh.iph->saddr; | |
645 | c->mfc_mcastgrp=skb->nh.iph->daddr; | |
646 | ||
647 | /* | |
648 | * Reflect first query at mrouted. | |
649 | */ | |
650 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
651 | /* If the report failed throw the cache entry | |
652 | out - Brad Parker | |
653 | */ | |
654 | spin_unlock_bh(&mfc_unres_lock); | |
655 | ||
656 | kmem_cache_free(mrt_cachep, c); | |
657 | kfree_skb(skb); | |
658 | return err; | |
659 | } | |
660 | ||
661 | atomic_inc(&cache_resolve_queue_len); | |
662 | c->next = mfc_unres_queue; | |
663 | mfc_unres_queue = c; | |
664 | ||
665 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
666 | } | |
667 | ||
668 | /* | |
669 | * See if we can append the packet | |
670 | */ | |
671 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
672 | kfree_skb(skb); | |
673 | err = -ENOBUFS; | |
674 | } else { | |
675 | skb_queue_tail(&c->mfc_un.unres.unresolved,skb); | |
676 | err = 0; | |
677 | } | |
678 | ||
679 | spin_unlock_bh(&mfc_unres_lock); | |
680 | return err; | |
681 | } | |
682 | ||
683 | /* | |
684 | * MFC cache manipulation by user space mroute daemon | |
685 | */ | |
686 | ||
687 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
688 | { | |
689 | int line; | |
690 | struct mfc_cache *c, **cp; | |
691 | ||
692 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
693 | ||
694 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
695 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
696 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
697 | write_lock_bh(&mrt_lock); | |
698 | *cp = c->next; | |
699 | write_unlock_bh(&mrt_lock); | |
700 | ||
701 | kmem_cache_free(mrt_cachep, c); | |
702 | return 0; | |
703 | } | |
704 | } | |
705 | return -ENOENT; | |
706 | } | |
707 | ||
708 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
709 | { | |
710 | int line; | |
711 | struct mfc_cache *uc, *c, **cp; | |
712 | ||
713 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
714 | ||
715 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
716 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
717 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
718 | break; | |
719 | } | |
720 | ||
721 | if (c != NULL) { | |
722 | write_lock_bh(&mrt_lock); | |
723 | c->mfc_parent = mfc->mfcc_parent; | |
724 | ipmr_update_threshoulds(c, mfc->mfcc_ttls); | |
725 | if (!mrtsock) | |
726 | c->mfc_flags |= MFC_STATIC; | |
727 | write_unlock_bh(&mrt_lock); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | if(!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) | |
732 | return -EINVAL; | |
733 | ||
734 | c=ipmr_cache_alloc(); | |
735 | if (c==NULL) | |
736 | return -ENOMEM; | |
737 | ||
738 | c->mfc_origin=mfc->mfcc_origin.s_addr; | |
739 | c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; | |
740 | c->mfc_parent=mfc->mfcc_parent; | |
741 | ipmr_update_threshoulds(c, mfc->mfcc_ttls); | |
742 | if (!mrtsock) | |
743 | c->mfc_flags |= MFC_STATIC; | |
744 | ||
745 | write_lock_bh(&mrt_lock); | |
746 | c->next = mfc_cache_array[line]; | |
747 | mfc_cache_array[line] = c; | |
748 | write_unlock_bh(&mrt_lock); | |
749 | ||
750 | /* | |
751 | * Check to see if we resolved a queued list. If so we | |
752 | * need to send on the frames and tidy up. | |
753 | */ | |
754 | spin_lock_bh(&mfc_unres_lock); | |
755 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
756 | cp = &uc->next) { | |
757 | if (uc->mfc_origin == c->mfc_origin && | |
758 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
759 | *cp = uc->next; | |
760 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
761 | del_timer(&ipmr_expire_timer); | |
762 | break; | |
763 | } | |
764 | } | |
765 | spin_unlock_bh(&mfc_unres_lock); | |
766 | ||
767 | if (uc) { | |
768 | ipmr_cache_resolve(uc, c); | |
769 | kmem_cache_free(mrt_cachep, uc); | |
770 | } | |
771 | return 0; | |
772 | } | |
773 | ||
774 | /* | |
775 | * Close the multicast socket, and clear the vif tables etc | |
776 | */ | |
777 | ||
778 | static void mroute_clean_tables(struct sock *sk) | |
779 | { | |
780 | int i; | |
781 | ||
782 | /* | |
783 | * Shut down all active vif entries | |
784 | */ | |
785 | for(i=0; i<maxvif; i++) { | |
786 | if (!(vif_table[i].flags&VIFF_STATIC)) | |
787 | vif_delete(i); | |
788 | } | |
789 | ||
790 | /* | |
791 | * Wipe the cache | |
792 | */ | |
793 | for (i=0;i<MFC_LINES;i++) { | |
794 | struct mfc_cache *c, **cp; | |
795 | ||
796 | cp = &mfc_cache_array[i]; | |
797 | while ((c = *cp) != NULL) { | |
798 | if (c->mfc_flags&MFC_STATIC) { | |
799 | cp = &c->next; | |
800 | continue; | |
801 | } | |
802 | write_lock_bh(&mrt_lock); | |
803 | *cp = c->next; | |
804 | write_unlock_bh(&mrt_lock); | |
805 | ||
806 | kmem_cache_free(mrt_cachep, c); | |
807 | } | |
808 | } | |
809 | ||
810 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
811 | struct mfc_cache *c; | |
812 | ||
813 | spin_lock_bh(&mfc_unres_lock); | |
814 | while (mfc_unres_queue != NULL) { | |
815 | c = mfc_unres_queue; | |
816 | mfc_unres_queue = c->next; | |
817 | spin_unlock_bh(&mfc_unres_lock); | |
818 | ||
819 | ipmr_destroy_unres(c); | |
820 | ||
821 | spin_lock_bh(&mfc_unres_lock); | |
822 | } | |
823 | spin_unlock_bh(&mfc_unres_lock); | |
824 | } | |
825 | } | |
826 | ||
827 | static void mrtsock_destruct(struct sock *sk) | |
828 | { | |
829 | rtnl_lock(); | |
830 | if (sk == mroute_socket) { | |
831 | ipv4_devconf.mc_forwarding--; | |
832 | ||
833 | write_lock_bh(&mrt_lock); | |
834 | mroute_socket=NULL; | |
835 | write_unlock_bh(&mrt_lock); | |
836 | ||
837 | mroute_clean_tables(sk); | |
838 | } | |
839 | rtnl_unlock(); | |
840 | } | |
841 | ||
842 | /* | |
843 | * Socket options and virtual interface manipulation. The whole | |
844 | * virtual interface system is a complete heap, but unfortunately | |
845 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
846 | * MOSPF/PIM router set up we can clean this up. | |
847 | */ | |
848 | ||
849 | int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) | |
850 | { | |
851 | int ret; | |
852 | struct vifctl vif; | |
853 | struct mfcctl mfc; | |
854 | ||
855 | if(optname!=MRT_INIT) | |
856 | { | |
857 | if(sk!=mroute_socket && !capable(CAP_NET_ADMIN)) | |
858 | return -EACCES; | |
859 | } | |
860 | ||
861 | switch(optname) | |
862 | { | |
863 | case MRT_INIT: | |
864 | if (sk->sk_type != SOCK_RAW || | |
865 | inet_sk(sk)->num != IPPROTO_IGMP) | |
866 | return -EOPNOTSUPP; | |
867 | if(optlen!=sizeof(int)) | |
868 | return -ENOPROTOOPT; | |
869 | ||
870 | rtnl_lock(); | |
871 | if (mroute_socket) { | |
872 | rtnl_unlock(); | |
873 | return -EADDRINUSE; | |
874 | } | |
875 | ||
876 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
877 | if (ret == 0) { | |
878 | write_lock_bh(&mrt_lock); | |
879 | mroute_socket=sk; | |
880 | write_unlock_bh(&mrt_lock); | |
881 | ||
882 | ipv4_devconf.mc_forwarding++; | |
883 | } | |
884 | rtnl_unlock(); | |
885 | return ret; | |
886 | case MRT_DONE: | |
887 | if (sk!=mroute_socket) | |
888 | return -EACCES; | |
889 | return ip_ra_control(sk, 0, NULL); | |
890 | case MRT_ADD_VIF: | |
891 | case MRT_DEL_VIF: | |
892 | if(optlen!=sizeof(vif)) | |
893 | return -EINVAL; | |
894 | if (copy_from_user(&vif,optval,sizeof(vif))) | |
895 | return -EFAULT; | |
896 | if(vif.vifc_vifi >= MAXVIFS) | |
897 | return -ENFILE; | |
898 | rtnl_lock(); | |
899 | if (optname==MRT_ADD_VIF) { | |
900 | ret = vif_add(&vif, sk==mroute_socket); | |
901 | } else { | |
902 | ret = vif_delete(vif.vifc_vifi); | |
903 | } | |
904 | rtnl_unlock(); | |
905 | return ret; | |
906 | ||
907 | /* | |
908 | * Manipulate the forwarding caches. These live | |
909 | * in a sort of kernel/user symbiosis. | |
910 | */ | |
911 | case MRT_ADD_MFC: | |
912 | case MRT_DEL_MFC: | |
913 | if(optlen!=sizeof(mfc)) | |
914 | return -EINVAL; | |
915 | if (copy_from_user(&mfc,optval, sizeof(mfc))) | |
916 | return -EFAULT; | |
917 | rtnl_lock(); | |
918 | if (optname==MRT_DEL_MFC) | |
919 | ret = ipmr_mfc_delete(&mfc); | |
920 | else | |
921 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); | |
922 | rtnl_unlock(); | |
923 | return ret; | |
924 | /* | |
925 | * Control PIM assert. | |
926 | */ | |
927 | case MRT_ASSERT: | |
928 | { | |
929 | int v; | |
930 | if(get_user(v,(int __user *)optval)) | |
931 | return -EFAULT; | |
932 | mroute_do_assert=(v)?1:0; | |
933 | return 0; | |
934 | } | |
935 | #ifdef CONFIG_IP_PIMSM | |
936 | case MRT_PIM: | |
937 | { | |
938 | int v, ret; | |
939 | if(get_user(v,(int __user *)optval)) | |
940 | return -EFAULT; | |
941 | v = (v)?1:0; | |
942 | rtnl_lock(); | |
943 | ret = 0; | |
944 | if (v != mroute_do_pim) { | |
945 | mroute_do_pim = v; | |
946 | mroute_do_assert = v; | |
947 | #ifdef CONFIG_IP_PIMSM_V2 | |
948 | if (mroute_do_pim) | |
949 | ret = inet_add_protocol(&pim_protocol, | |
950 | IPPROTO_PIM); | |
951 | else | |
952 | ret = inet_del_protocol(&pim_protocol, | |
953 | IPPROTO_PIM); | |
954 | if (ret < 0) | |
955 | ret = -EAGAIN; | |
956 | #endif | |
957 | } | |
958 | rtnl_unlock(); | |
959 | return ret; | |
960 | } | |
961 | #endif | |
962 | /* | |
963 | * Spurious command, or MRT_VERSION which you cannot | |
964 | * set. | |
965 | */ | |
966 | default: | |
967 | return -ENOPROTOOPT; | |
968 | } | |
969 | } | |
970 | ||
971 | /* | |
972 | * Getsock opt support for the multicast routing system. | |
973 | */ | |
974 | ||
975 | int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) | |
976 | { | |
977 | int olr; | |
978 | int val; | |
979 | ||
980 | if(optname!=MRT_VERSION && | |
981 | #ifdef CONFIG_IP_PIMSM | |
982 | optname!=MRT_PIM && | |
983 | #endif | |
984 | optname!=MRT_ASSERT) | |
985 | return -ENOPROTOOPT; | |
986 | ||
987 | if (get_user(olr, optlen)) | |
988 | return -EFAULT; | |
989 | ||
990 | olr = min_t(unsigned int, olr, sizeof(int)); | |
991 | if (olr < 0) | |
992 | return -EINVAL; | |
993 | ||
994 | if(put_user(olr,optlen)) | |
995 | return -EFAULT; | |
996 | if(optname==MRT_VERSION) | |
997 | val=0x0305; | |
998 | #ifdef CONFIG_IP_PIMSM | |
999 | else if(optname==MRT_PIM) | |
1000 | val=mroute_do_pim; | |
1001 | #endif | |
1002 | else | |
1003 | val=mroute_do_assert; | |
1004 | if(copy_to_user(optval,&val,olr)) | |
1005 | return -EFAULT; | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * The IP multicast ioctl support routines. | |
1011 | */ | |
1012 | ||
1013 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1014 | { | |
1015 | struct sioc_sg_req sr; | |
1016 | struct sioc_vif_req vr; | |
1017 | struct vif_device *vif; | |
1018 | struct mfc_cache *c; | |
1019 | ||
1020 | switch(cmd) | |
1021 | { | |
1022 | case SIOCGETVIFCNT: | |
1023 | if (copy_from_user(&vr,arg,sizeof(vr))) | |
1024 | return -EFAULT; | |
1025 | if(vr.vifi>=maxvif) | |
1026 | return -EINVAL; | |
1027 | read_lock(&mrt_lock); | |
1028 | vif=&vif_table[vr.vifi]; | |
1029 | if(VIF_EXISTS(vr.vifi)) { | |
1030 | vr.icount=vif->pkt_in; | |
1031 | vr.ocount=vif->pkt_out; | |
1032 | vr.ibytes=vif->bytes_in; | |
1033 | vr.obytes=vif->bytes_out; | |
1034 | read_unlock(&mrt_lock); | |
1035 | ||
1036 | if (copy_to_user(arg,&vr,sizeof(vr))) | |
1037 | return -EFAULT; | |
1038 | return 0; | |
1039 | } | |
1040 | read_unlock(&mrt_lock); | |
1041 | return -EADDRNOTAVAIL; | |
1042 | case SIOCGETSGCNT: | |
1043 | if (copy_from_user(&sr,arg,sizeof(sr))) | |
1044 | return -EFAULT; | |
1045 | ||
1046 | read_lock(&mrt_lock); | |
1047 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1048 | if (c) { | |
1049 | sr.pktcnt = c->mfc_un.res.pkt; | |
1050 | sr.bytecnt = c->mfc_un.res.bytes; | |
1051 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1052 | read_unlock(&mrt_lock); | |
1053 | ||
1054 | if (copy_to_user(arg,&sr,sizeof(sr))) | |
1055 | return -EFAULT; | |
1056 | return 0; | |
1057 | } | |
1058 | read_unlock(&mrt_lock); | |
1059 | return -EADDRNOTAVAIL; | |
1060 | default: | |
1061 | return -ENOIOCTLCMD; | |
1062 | } | |
1063 | } | |
1064 | ||
1065 | ||
1066 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1067 | { | |
1068 | struct vif_device *v; | |
1069 | int ct; | |
1070 | if (event != NETDEV_UNREGISTER) | |
1071 | return NOTIFY_DONE; | |
1072 | v=&vif_table[0]; | |
1073 | for(ct=0;ct<maxvif;ct++,v++) { | |
1074 | if (v->dev==ptr) | |
1075 | vif_delete(ct); | |
1076 | } | |
1077 | return NOTIFY_DONE; | |
1078 | } | |
1079 | ||
1080 | ||
1081 | static struct notifier_block ip_mr_notifier={ | |
1082 | .notifier_call = ipmr_device_event, | |
1083 | }; | |
1084 | ||
1085 | /* | |
1086 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1087 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1088 | * important for multicast video. | |
1089 | */ | |
1090 | ||
1091 | static void ip_encap(struct sk_buff *skb, u32 saddr, u32 daddr) | |
1092 | { | |
1093 | struct iphdr *iph = (struct iphdr *)skb_push(skb,sizeof(struct iphdr)); | |
1094 | ||
1095 | iph->version = 4; | |
1096 | iph->tos = skb->nh.iph->tos; | |
1097 | iph->ttl = skb->nh.iph->ttl; | |
1098 | iph->frag_off = 0; | |
1099 | iph->daddr = daddr; | |
1100 | iph->saddr = saddr; | |
1101 | iph->protocol = IPPROTO_IPIP; | |
1102 | iph->ihl = 5; | |
1103 | iph->tot_len = htons(skb->len); | |
1104 | ip_select_ident(iph, skb->dst, NULL); | |
1105 | ip_send_check(iph); | |
1106 | ||
1107 | skb->h.ipiph = skb->nh.iph; | |
1108 | skb->nh.iph = iph; | |
1109 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
1110 | nf_reset(skb); | |
1111 | } | |
1112 | ||
1113 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1114 | { | |
1115 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1116 | ||
1117 | IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
1118 | ||
1119 | if (unlikely(opt->optlen)) | |
1120 | ip_forward_options(skb); | |
1121 | ||
1122 | return dst_output(skb); | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Processing handlers for ipmr_forward | |
1127 | */ | |
1128 | ||
1129 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1130 | { | |
1131 | struct iphdr *iph = skb->nh.iph; | |
1132 | struct vif_device *vif = &vif_table[vifi]; | |
1133 | struct net_device *dev; | |
1134 | struct rtable *rt; | |
1135 | int encap = 0; | |
1136 | ||
1137 | if (vif->dev == NULL) | |
1138 | goto out_free; | |
1139 | ||
1140 | #ifdef CONFIG_IP_PIMSM | |
1141 | if (vif->flags & VIFF_REGISTER) { | |
1142 | vif->pkt_out++; | |
1143 | vif->bytes_out+=skb->len; | |
1144 | ((struct net_device_stats*)vif->dev->priv)->tx_bytes += skb->len; | |
1145 | ((struct net_device_stats*)vif->dev->priv)->tx_packets++; | |
1146 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); | |
1147 | kfree_skb(skb); | |
1148 | return; | |
1149 | } | |
1150 | #endif | |
1151 | ||
1152 | if (vif->flags&VIFF_TUNNEL) { | |
1153 | struct flowi fl = { .oif = vif->link, | |
1154 | .nl_u = { .ip4_u = | |
1155 | { .daddr = vif->remote, | |
1156 | .saddr = vif->local, | |
1157 | .tos = RT_TOS(iph->tos) } }, | |
1158 | .proto = IPPROTO_IPIP }; | |
1159 | if (ip_route_output_key(&rt, &fl)) | |
1160 | goto out_free; | |
1161 | encap = sizeof(struct iphdr); | |
1162 | } else { | |
1163 | struct flowi fl = { .oif = vif->link, | |
1164 | .nl_u = { .ip4_u = | |
1165 | { .daddr = iph->daddr, | |
1166 | .tos = RT_TOS(iph->tos) } }, | |
1167 | .proto = IPPROTO_IPIP }; | |
1168 | if (ip_route_output_key(&rt, &fl)) | |
1169 | goto out_free; | |
1170 | } | |
1171 | ||
1172 | dev = rt->u.dst.dev; | |
1173 | ||
1174 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1175 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1176 | allow to send ICMP, so that packets will disappear | |
1177 | to blackhole. | |
1178 | */ | |
1179 | ||
1180 | IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
1181 | ip_rt_put(rt); | |
1182 | goto out_free; | |
1183 | } | |
1184 | ||
1185 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1186 | ||
1187 | if (skb_cow(skb, encap)) { | |
1188 | ip_rt_put(rt); | |
1189 | goto out_free; | |
1190 | } | |
1191 | ||
1192 | vif->pkt_out++; | |
1193 | vif->bytes_out+=skb->len; | |
1194 | ||
1195 | dst_release(skb->dst); | |
1196 | skb->dst = &rt->u.dst; | |
1197 | iph = skb->nh.iph; | |
1198 | ip_decrease_ttl(iph); | |
1199 | ||
1200 | /* FIXME: forward and output firewalls used to be called here. | |
1201 | * What do we do with netfilter? -- RR */ | |
1202 | if (vif->flags & VIFF_TUNNEL) { | |
1203 | ip_encap(skb, vif->local, vif->remote); | |
1204 | /* FIXME: extra output firewall step used to be here. --RR */ | |
1205 | ((struct ip_tunnel *)vif->dev->priv)->stat.tx_packets++; | |
1206 | ((struct ip_tunnel *)vif->dev->priv)->stat.tx_bytes+=skb->len; | |
1207 | } | |
1208 | ||
1209 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1210 | ||
1211 | /* | |
1212 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1213 | * not only before forwarding, but after forwarding on all output | |
1214 | * interfaces. It is clear, if mrouter runs a multicasting | |
1215 | * program, it should receive packets not depending to what interface | |
1216 | * program is joined. | |
1217 | * If we will not make it, the program will have to join on all | |
1218 | * interfaces. On the other hand, multihoming host (or router, but | |
1219 | * not mrouter) cannot join to more than one interface - it will | |
1220 | * result in receiving multiple packets. | |
1221 | */ | |
1222 | NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, | |
1223 | ipmr_forward_finish); | |
1224 | return; | |
1225 | ||
1226 | out_free: | |
1227 | kfree_skb(skb); | |
1228 | return; | |
1229 | } | |
1230 | ||
1231 | static int ipmr_find_vif(struct net_device *dev) | |
1232 | { | |
1233 | int ct; | |
1234 | for (ct=maxvif-1; ct>=0; ct--) { | |
1235 | if (vif_table[ct].dev == dev) | |
1236 | break; | |
1237 | } | |
1238 | return ct; | |
1239 | } | |
1240 | ||
1241 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1242 | ||
1243 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1244 | { | |
1245 | int psend = -1; | |
1246 | int vif, ct; | |
1247 | ||
1248 | vif = cache->mfc_parent; | |
1249 | cache->mfc_un.res.pkt++; | |
1250 | cache->mfc_un.res.bytes += skb->len; | |
1251 | ||
1252 | /* | |
1253 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1254 | */ | |
1255 | if (vif_table[vif].dev != skb->dev) { | |
1256 | int true_vifi; | |
1257 | ||
1258 | if (((struct rtable*)skb->dst)->fl.iif == 0) { | |
1259 | /* It is our own packet, looped back. | |
1260 | Very complicated situation... | |
1261 | ||
1262 | The best workaround until routing daemons will be | |
1263 | fixed is not to redistribute packet, if it was | |
1264 | send through wrong interface. It means, that | |
1265 | multicast applications WILL NOT work for | |
1266 | (S,G), which have default multicast route pointing | |
1267 | to wrong oif. In any case, it is not a good | |
1268 | idea to use multicasting applications on router. | |
1269 | */ | |
1270 | goto dont_forward; | |
1271 | } | |
1272 | ||
1273 | cache->mfc_un.res.wrong_if++; | |
1274 | true_vifi = ipmr_find_vif(skb->dev); | |
1275 | ||
1276 | if (true_vifi >= 0 && mroute_do_assert && | |
1277 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1278 | so that we cannot check that packet arrived on an oif. | |
1279 | It is bad, but otherwise we would need to move pretty | |
1280 | large chunk of pimd to kernel. Ough... --ANK | |
1281 | */ | |
1282 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
1283 | time_after(jiffies, | |
1284 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1285 | cache->mfc_un.res.last_assert = jiffies; | |
1286 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1287 | } | |
1288 | goto dont_forward; | |
1289 | } | |
1290 | ||
1291 | vif_table[vif].pkt_in++; | |
1292 | vif_table[vif].bytes_in+=skb->len; | |
1293 | ||
1294 | /* | |
1295 | * Forward the frame | |
1296 | */ | |
1297 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1298 | if (skb->nh.iph->ttl > cache->mfc_un.res.ttls[ct]) { | |
1299 | if (psend != -1) { | |
1300 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1301 | if (skb2) | |
1302 | ipmr_queue_xmit(skb2, cache, psend); | |
1303 | } | |
1304 | psend=ct; | |
1305 | } | |
1306 | } | |
1307 | if (psend != -1) { | |
1308 | if (local) { | |
1309 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1310 | if (skb2) | |
1311 | ipmr_queue_xmit(skb2, cache, psend); | |
1312 | } else { | |
1313 | ipmr_queue_xmit(skb, cache, psend); | |
1314 | return 0; | |
1315 | } | |
1316 | } | |
1317 | ||
1318 | dont_forward: | |
1319 | if (!local) | |
1320 | kfree_skb(skb); | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | ||
1325 | /* | |
1326 | * Multicast packets for forwarding arrive here | |
1327 | */ | |
1328 | ||
1329 | int ip_mr_input(struct sk_buff *skb) | |
1330 | { | |
1331 | struct mfc_cache *cache; | |
1332 | int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; | |
1333 | ||
1334 | /* Packet is looped back after forward, it should not be | |
1335 | forwarded second time, but still can be delivered locally. | |
1336 | */ | |
1337 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1338 | goto dont_forward; | |
1339 | ||
1340 | if (!local) { | |
1341 | if (IPCB(skb)->opt.router_alert) { | |
1342 | if (ip_call_ra_chain(skb)) | |
1343 | return 0; | |
1344 | } else if (skb->nh.iph->protocol == IPPROTO_IGMP){ | |
1345 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1346 | Cisco IOS <= 11.2(8)) do not put router alert | |
1347 | option to IGMP packets destined to routable | |
1348 | groups. It is very bad, because it means | |
1349 | that we can forward NO IGMP messages. | |
1350 | */ | |
1351 | read_lock(&mrt_lock); | |
1352 | if (mroute_socket) { | |
1353 | raw_rcv(mroute_socket, skb); | |
1354 | read_unlock(&mrt_lock); | |
1355 | return 0; | |
1356 | } | |
1357 | read_unlock(&mrt_lock); | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | read_lock(&mrt_lock); | |
1362 | cache = ipmr_cache_find(skb->nh.iph->saddr, skb->nh.iph->daddr); | |
1363 | ||
1364 | /* | |
1365 | * No usable cache entry | |
1366 | */ | |
1367 | if (cache==NULL) { | |
1368 | int vif; | |
1369 | ||
1370 | if (local) { | |
1371 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1372 | ip_local_deliver(skb); | |
1373 | if (skb2 == NULL) { | |
1374 | read_unlock(&mrt_lock); | |
1375 | return -ENOBUFS; | |
1376 | } | |
1377 | skb = skb2; | |
1378 | } | |
1379 | ||
1380 | vif = ipmr_find_vif(skb->dev); | |
1381 | if (vif >= 0) { | |
1382 | int err = ipmr_cache_unresolved(vif, skb); | |
1383 | read_unlock(&mrt_lock); | |
1384 | ||
1385 | return err; | |
1386 | } | |
1387 | read_unlock(&mrt_lock); | |
1388 | kfree_skb(skb); | |
1389 | return -ENODEV; | |
1390 | } | |
1391 | ||
1392 | ip_mr_forward(skb, cache, local); | |
1393 | ||
1394 | read_unlock(&mrt_lock); | |
1395 | ||
1396 | if (local) | |
1397 | return ip_local_deliver(skb); | |
1398 | ||
1399 | return 0; | |
1400 | ||
1401 | dont_forward: | |
1402 | if (local) | |
1403 | return ip_local_deliver(skb); | |
1404 | kfree_skb(skb); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | #ifdef CONFIG_IP_PIMSM_V1 | |
1409 | /* | |
1410 | * Handle IGMP messages of PIMv1 | |
1411 | */ | |
1412 | ||
1413 | int pim_rcv_v1(struct sk_buff * skb) | |
1414 | { | |
1415 | struct igmphdr *pim; | |
1416 | struct iphdr *encap; | |
1417 | struct net_device *reg_dev = NULL; | |
1418 | ||
1419 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
1420 | goto drop; | |
1421 | ||
1422 | pim = (struct igmphdr*)skb->h.raw; | |
1423 | ||
1424 | if (!mroute_do_pim || | |
1425 | skb->len < sizeof(*pim) + sizeof(*encap) || | |
1426 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) | |
1427 | goto drop; | |
1428 | ||
1429 | encap = (struct iphdr*)(skb->h.raw + sizeof(struct igmphdr)); | |
1430 | /* | |
1431 | Check that: | |
1432 | a. packet is really destinted to a multicast group | |
1433 | b. packet is not a NULL-REGISTER | |
1434 | c. packet is not truncated | |
1435 | */ | |
1436 | if (!MULTICAST(encap->daddr) || | |
1437 | encap->tot_len == 0 || | |
1438 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) | |
1439 | goto drop; | |
1440 | ||
1441 | read_lock(&mrt_lock); | |
1442 | if (reg_vif_num >= 0) | |
1443 | reg_dev = vif_table[reg_vif_num].dev; | |
1444 | if (reg_dev) | |
1445 | dev_hold(reg_dev); | |
1446 | read_unlock(&mrt_lock); | |
1447 | ||
1448 | if (reg_dev == NULL) | |
1449 | goto drop; | |
1450 | ||
1451 | skb->mac.raw = skb->nh.raw; | |
1452 | skb_pull(skb, (u8*)encap - skb->data); | |
1453 | skb->nh.iph = (struct iphdr *)skb->data; | |
1454 | skb->dev = reg_dev; | |
1455 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); | |
1456 | skb->protocol = htons(ETH_P_IP); | |
1457 | skb->ip_summed = 0; | |
1458 | skb->pkt_type = PACKET_HOST; | |
1459 | dst_release(skb->dst); | |
1460 | skb->dst = NULL; | |
1461 | ((struct net_device_stats*)reg_dev->priv)->rx_bytes += skb->len; | |
1462 | ((struct net_device_stats*)reg_dev->priv)->rx_packets++; | |
1463 | nf_reset(skb); | |
1464 | netif_rx(skb); | |
1465 | dev_put(reg_dev); | |
1466 | return 0; | |
1467 | drop: | |
1468 | kfree_skb(skb); | |
1469 | return 0; | |
1470 | } | |
1471 | #endif | |
1472 | ||
1473 | #ifdef CONFIG_IP_PIMSM_V2 | |
1474 | static int pim_rcv(struct sk_buff * skb) | |
1475 | { | |
1476 | struct pimreghdr *pim; | |
1477 | struct iphdr *encap; | |
1478 | struct net_device *reg_dev = NULL; | |
1479 | ||
1480 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
1481 | goto drop; | |
1482 | ||
1483 | pim = (struct pimreghdr*)skb->h.raw; | |
1484 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || | |
1485 | (pim->flags&PIM_NULL_REGISTER) || | |
1486 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && | |
1487 | (u16)csum_fold(skb_checksum(skb, 0, skb->len, 0)))) | |
1488 | goto drop; | |
1489 | ||
1490 | /* check if the inner packet is destined to mcast group */ | |
1491 | encap = (struct iphdr*)(skb->h.raw + sizeof(struct pimreghdr)); | |
1492 | if (!MULTICAST(encap->daddr) || | |
1493 | encap->tot_len == 0 || | |
1494 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) | |
1495 | goto drop; | |
1496 | ||
1497 | read_lock(&mrt_lock); | |
1498 | if (reg_vif_num >= 0) | |
1499 | reg_dev = vif_table[reg_vif_num].dev; | |
1500 | if (reg_dev) | |
1501 | dev_hold(reg_dev); | |
1502 | read_unlock(&mrt_lock); | |
1503 | ||
1504 | if (reg_dev == NULL) | |
1505 | goto drop; | |
1506 | ||
1507 | skb->mac.raw = skb->nh.raw; | |
1508 | skb_pull(skb, (u8*)encap - skb->data); | |
1509 | skb->nh.iph = (struct iphdr *)skb->data; | |
1510 | skb->dev = reg_dev; | |
1511 | memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options)); | |
1512 | skb->protocol = htons(ETH_P_IP); | |
1513 | skb->ip_summed = 0; | |
1514 | skb->pkt_type = PACKET_HOST; | |
1515 | dst_release(skb->dst); | |
1516 | ((struct net_device_stats*)reg_dev->priv)->rx_bytes += skb->len; | |
1517 | ((struct net_device_stats*)reg_dev->priv)->rx_packets++; | |
1518 | skb->dst = NULL; | |
1519 | nf_reset(skb); | |
1520 | netif_rx(skb); | |
1521 | dev_put(reg_dev); | |
1522 | return 0; | |
1523 | drop: | |
1524 | kfree_skb(skb); | |
1525 | return 0; | |
1526 | } | |
1527 | #endif | |
1528 | ||
1529 | static int | |
1530 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1531 | { | |
1532 | int ct; | |
1533 | struct rtnexthop *nhp; | |
1534 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
1535 | u8 *b = skb->tail; | |
1536 | struct rtattr *mp_head; | |
1537 | ||
1538 | if (dev) | |
1539 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1540 | ||
1541 | mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); | |
1542 | ||
1543 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1544 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1545 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1546 | goto rtattr_failure; | |
1547 | nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1548 | nhp->rtnh_flags = 0; | |
1549 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1550 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1551 | nhp->rtnh_len = sizeof(*nhp); | |
1552 | } | |
1553 | } | |
1554 | mp_head->rta_type = RTA_MULTIPATH; | |
1555 | mp_head->rta_len = skb->tail - (u8*)mp_head; | |
1556 | rtm->rtm_type = RTN_MULTICAST; | |
1557 | return 1; | |
1558 | ||
1559 | rtattr_failure: | |
1560 | skb_trim(skb, b - skb->data); | |
1561 | return -EMSGSIZE; | |
1562 | } | |
1563 | ||
1564 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1565 | { | |
1566 | int err; | |
1567 | struct mfc_cache *cache; | |
1568 | struct rtable *rt = (struct rtable*)skb->dst; | |
1569 | ||
1570 | read_lock(&mrt_lock); | |
1571 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1572 | ||
1573 | if (cache==NULL) { | |
1574 | struct net_device *dev; | |
1575 | int vif; | |
1576 | ||
1577 | if (nowait) { | |
1578 | read_unlock(&mrt_lock); | |
1579 | return -EAGAIN; | |
1580 | } | |
1581 | ||
1582 | dev = skb->dev; | |
1583 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1584 | read_unlock(&mrt_lock); | |
1585 | return -ENODEV; | |
1586 | } | |
1587 | skb->nh.raw = skb_push(skb, sizeof(struct iphdr)); | |
1588 | skb->nh.iph->ihl = sizeof(struct iphdr)>>2; | |
1589 | skb->nh.iph->saddr = rt->rt_src; | |
1590 | skb->nh.iph->daddr = rt->rt_dst; | |
1591 | skb->nh.iph->version = 0; | |
1592 | err = ipmr_cache_unresolved(vif, skb); | |
1593 | read_unlock(&mrt_lock); | |
1594 | return err; | |
1595 | } | |
1596 | ||
1597 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1598 | cache->mfc_flags |= MFC_NOTIFY; | |
1599 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1600 | read_unlock(&mrt_lock); | |
1601 | return err; | |
1602 | } | |
1603 | ||
1604 | #ifdef CONFIG_PROC_FS | |
1605 | /* | |
1606 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1607 | */ | |
1608 | struct ipmr_vif_iter { | |
1609 | int ct; | |
1610 | }; | |
1611 | ||
1612 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1613 | loff_t pos) | |
1614 | { | |
1615 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
1616 | if(!VIF_EXISTS(iter->ct)) | |
1617 | continue; | |
1618 | if (pos-- == 0) | |
1619 | return &vif_table[iter->ct]; | |
1620 | } | |
1621 | return NULL; | |
1622 | } | |
1623 | ||
1624 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
1625 | { | |
1626 | read_lock(&mrt_lock); | |
1627 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) | |
1628 | : SEQ_START_TOKEN; | |
1629 | } | |
1630 | ||
1631 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1632 | { | |
1633 | struct ipmr_vif_iter *iter = seq->private; | |
1634 | ||
1635 | ++*pos; | |
1636 | if (v == SEQ_START_TOKEN) | |
1637 | return ipmr_vif_seq_idx(iter, 0); | |
1638 | ||
1639 | while (++iter->ct < maxvif) { | |
1640 | if(!VIF_EXISTS(iter->ct)) | |
1641 | continue; | |
1642 | return &vif_table[iter->ct]; | |
1643 | } | |
1644 | return NULL; | |
1645 | } | |
1646 | ||
1647 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
1648 | { | |
1649 | read_unlock(&mrt_lock); | |
1650 | } | |
1651 | ||
1652 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1653 | { | |
1654 | if (v == SEQ_START_TOKEN) { | |
1655 | seq_puts(seq, | |
1656 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); | |
1657 | } else { | |
1658 | const struct vif_device *vif = v; | |
1659 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1660 | ||
1661 | seq_printf(seq, | |
1662 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1663 | vif - vif_table, | |
1664 | name, vif->bytes_in, vif->pkt_in, | |
1665 | vif->bytes_out, vif->pkt_out, | |
1666 | vif->flags, vif->local, vif->remote); | |
1667 | } | |
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | static struct seq_operations ipmr_vif_seq_ops = { | |
1672 | .start = ipmr_vif_seq_start, | |
1673 | .next = ipmr_vif_seq_next, | |
1674 | .stop = ipmr_vif_seq_stop, | |
1675 | .show = ipmr_vif_seq_show, | |
1676 | }; | |
1677 | ||
1678 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1679 | { | |
1680 | struct seq_file *seq; | |
1681 | int rc = -ENOMEM; | |
1682 | struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1683 | ||
1684 | if (!s) | |
1685 | goto out; | |
1686 | ||
1687 | rc = seq_open(file, &ipmr_vif_seq_ops); | |
1688 | if (rc) | |
1689 | goto out_kfree; | |
1690 | ||
1691 | s->ct = 0; | |
1692 | seq = file->private_data; | |
1693 | seq->private = s; | |
1694 | out: | |
1695 | return rc; | |
1696 | out_kfree: | |
1697 | kfree(s); | |
1698 | goto out; | |
1699 | ||
1700 | } | |
1701 | ||
1702 | static struct file_operations ipmr_vif_fops = { | |
1703 | .owner = THIS_MODULE, | |
1704 | .open = ipmr_vif_open, | |
1705 | .read = seq_read, | |
1706 | .llseek = seq_lseek, | |
1707 | .release = seq_release_private, | |
1708 | }; | |
1709 | ||
1710 | struct ipmr_mfc_iter { | |
1711 | struct mfc_cache **cache; | |
1712 | int ct; | |
1713 | }; | |
1714 | ||
1715 | ||
1716 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1717 | { | |
1718 | struct mfc_cache *mfc; | |
1719 | ||
1720 | it->cache = mfc_cache_array; | |
1721 | read_lock(&mrt_lock); | |
1722 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) | |
1723 | for(mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) | |
1724 | if (pos-- == 0) | |
1725 | return mfc; | |
1726 | read_unlock(&mrt_lock); | |
1727 | ||
1728 | it->cache = &mfc_unres_queue; | |
1729 | spin_lock_bh(&mfc_unres_lock); | |
1730 | for(mfc = mfc_unres_queue; mfc; mfc = mfc->next) | |
1731 | if (pos-- == 0) | |
1732 | return mfc; | |
1733 | spin_unlock_bh(&mfc_unres_lock); | |
1734 | ||
1735 | it->cache = NULL; | |
1736 | return NULL; | |
1737 | } | |
1738 | ||
1739 | ||
1740 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1741 | { | |
1742 | struct ipmr_mfc_iter *it = seq->private; | |
1743 | it->cache = NULL; | |
1744 | it->ct = 0; | |
1745 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) | |
1746 | : SEQ_START_TOKEN; | |
1747 | } | |
1748 | ||
1749 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1750 | { | |
1751 | struct mfc_cache *mfc = v; | |
1752 | struct ipmr_mfc_iter *it = seq->private; | |
1753 | ||
1754 | ++*pos; | |
1755 | ||
1756 | if (v == SEQ_START_TOKEN) | |
1757 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1758 | ||
1759 | if (mfc->next) | |
1760 | return mfc->next; | |
1761 | ||
1762 | if (it->cache == &mfc_unres_queue) | |
1763 | goto end_of_list; | |
1764 | ||
1765 | BUG_ON(it->cache != mfc_cache_array); | |
1766 | ||
1767 | while (++it->ct < MFC_LINES) { | |
1768 | mfc = mfc_cache_array[it->ct]; | |
1769 | if (mfc) | |
1770 | return mfc; | |
1771 | } | |
1772 | ||
1773 | /* exhausted cache_array, show unresolved */ | |
1774 | read_unlock(&mrt_lock); | |
1775 | it->cache = &mfc_unres_queue; | |
1776 | it->ct = 0; | |
1777 | ||
1778 | spin_lock_bh(&mfc_unres_lock); | |
1779 | mfc = mfc_unres_queue; | |
1780 | if (mfc) | |
1781 | return mfc; | |
1782 | ||
1783 | end_of_list: | |
1784 | spin_unlock_bh(&mfc_unres_lock); | |
1785 | it->cache = NULL; | |
1786 | ||
1787 | return NULL; | |
1788 | } | |
1789 | ||
1790 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1791 | { | |
1792 | struct ipmr_mfc_iter *it = seq->private; | |
1793 | ||
1794 | if (it->cache == &mfc_unres_queue) | |
1795 | spin_unlock_bh(&mfc_unres_lock); | |
1796 | else if (it->cache == mfc_cache_array) | |
1797 | read_unlock(&mrt_lock); | |
1798 | } | |
1799 | ||
1800 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1801 | { | |
1802 | int n; | |
1803 | ||
1804 | if (v == SEQ_START_TOKEN) { | |
1805 | seq_puts(seq, | |
1806 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); | |
1807 | } else { | |
1808 | const struct mfc_cache *mfc = v; | |
1809 | const struct ipmr_mfc_iter *it = seq->private; | |
1810 | ||
1811 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", | |
1812 | (unsigned long) mfc->mfc_mcastgrp, | |
1813 | (unsigned long) mfc->mfc_origin, | |
1814 | mfc->mfc_parent, | |
1815 | mfc->mfc_un.res.pkt, | |
1816 | mfc->mfc_un.res.bytes, | |
1817 | mfc->mfc_un.res.wrong_if); | |
1818 | ||
1819 | if (it->cache != &mfc_unres_queue) { | |
1820 | for(n = mfc->mfc_un.res.minvif; | |
1821 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1822 | if(VIF_EXISTS(n) | |
1823 | && mfc->mfc_un.res.ttls[n] < 255) | |
1824 | seq_printf(seq, | |
1825 | " %2d:%-3d", | |
1826 | n, mfc->mfc_un.res.ttls[n]); | |
1827 | } | |
1828 | } | |
1829 | seq_putc(seq, '\n'); | |
1830 | } | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | static struct seq_operations ipmr_mfc_seq_ops = { | |
1835 | .start = ipmr_mfc_seq_start, | |
1836 | .next = ipmr_mfc_seq_next, | |
1837 | .stop = ipmr_mfc_seq_stop, | |
1838 | .show = ipmr_mfc_seq_show, | |
1839 | }; | |
1840 | ||
1841 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1842 | { | |
1843 | struct seq_file *seq; | |
1844 | int rc = -ENOMEM; | |
1845 | struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1846 | ||
1847 | if (!s) | |
1848 | goto out; | |
1849 | ||
1850 | rc = seq_open(file, &ipmr_mfc_seq_ops); | |
1851 | if (rc) | |
1852 | goto out_kfree; | |
1853 | ||
1854 | seq = file->private_data; | |
1855 | seq->private = s; | |
1856 | out: | |
1857 | return rc; | |
1858 | out_kfree: | |
1859 | kfree(s); | |
1860 | goto out; | |
1861 | ||
1862 | } | |
1863 | ||
1864 | static struct file_operations ipmr_mfc_fops = { | |
1865 | .owner = THIS_MODULE, | |
1866 | .open = ipmr_mfc_open, | |
1867 | .read = seq_read, | |
1868 | .llseek = seq_lseek, | |
1869 | .release = seq_release_private, | |
1870 | }; | |
1871 | #endif | |
1872 | ||
1873 | #ifdef CONFIG_IP_PIMSM_V2 | |
1874 | static struct net_protocol pim_protocol = { | |
1875 | .handler = pim_rcv, | |
1876 | }; | |
1877 | #endif | |
1878 | ||
1879 | ||
1880 | /* | |
1881 | * Setup for IP multicast routing | |
1882 | */ | |
1883 | ||
1884 | void __init ip_mr_init(void) | |
1885 | { | |
1886 | mrt_cachep = kmem_cache_create("ip_mrt_cache", | |
1887 | sizeof(struct mfc_cache), | |
1888 | 0, SLAB_HWCACHE_ALIGN, | |
1889 | NULL, NULL); | |
1890 | if (!mrt_cachep) | |
1891 | panic("cannot allocate ip_mrt_cache"); | |
1892 | ||
1893 | init_timer(&ipmr_expire_timer); | |
1894 | ipmr_expire_timer.function=ipmr_expire_process; | |
1895 | register_netdevice_notifier(&ip_mr_notifier); | |
1896 | #ifdef CONFIG_PROC_FS | |
1897 | proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops); | |
1898 | proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops); | |
1899 | #endif | |
1900 | } |