]>
Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 LT |
31 | #include <asm/system.h> |
32 | #include <asm/uaccess.h> | |
33 | #include <linux/types.h> | |
4fc268d2 | 34 | #include <linux/capability.h> |
1da177e4 LT |
35 | #include <linux/errno.h> |
36 | #include <linux/timer.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/fcntl.h> | |
40 | #include <linux/stat.h> | |
41 | #include <linux/socket.h> | |
42 | #include <linux/in.h> | |
43 | #include <linux/inet.h> | |
44 | #include <linux/netdevice.h> | |
45 | #include <linux/inetdevice.h> | |
46 | #include <linux/igmp.h> | |
47 | #include <linux/proc_fs.h> | |
48 | #include <linux/seq_file.h> | |
49 | #include <linux/mroute.h> | |
50 | #include <linux/init.h> | |
46f25dff | 51 | #include <linux/if_ether.h> |
1da177e4 LT |
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 | ||
e18b890b | 107 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
108 | |
109 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
110 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
111 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
112 | ||
113 | #ifdef CONFIG_IP_PIMSM_V2 | |
114 | static struct net_protocol pim_protocol; | |
115 | #endif | |
116 | ||
117 | static struct timer_list ipmr_expire_timer; | |
118 | ||
119 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
120 | ||
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); | |
2941a486 PM |
180 | ((struct net_device_stats*)netdev_priv(dev))->tx_bytes += skb->len; |
181 | ((struct net_device_stats*)netdev_priv(dev))->tx_packets++; | |
1da177e4 LT |
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 | { | |
2941a486 | 190 | return (struct net_device_stats*)netdev_priv(dev); |
1da177e4 LT |
191 | } |
192 | ||
193 | static void reg_vif_setup(struct net_device *dev) | |
194 | { | |
195 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 196 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 LT |
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 | */ | |
e905a9ed | 243 | |
1da177e4 LT |
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 | ||
132adf54 | 305 | while ((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 306 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
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)); | |
2942e900 TG |
314 | |
315 | rtnl_unicast(skb, NETLINK_CB(skb).pid); | |
1da177e4 LT |
316 | } else |
317 | kfree_skb(skb); | |
318 | } | |
319 | ||
320 | kmem_cache_free(mrt_cachep, c); | |
321 | } | |
322 | ||
323 | ||
324 | /* Single timer process for all the unresolved queue. */ | |
325 | ||
326 | static void ipmr_expire_process(unsigned long dummy) | |
327 | { | |
328 | unsigned long now; | |
329 | unsigned long expires; | |
330 | struct mfc_cache *c, **cp; | |
331 | ||
332 | if (!spin_trylock(&mfc_unres_lock)) { | |
333 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
334 | return; | |
335 | } | |
336 | ||
337 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
338 | goto out; | |
339 | ||
340 | now = jiffies; | |
341 | expires = 10*HZ; | |
342 | cp = &mfc_unres_queue; | |
343 | ||
344 | while ((c=*cp) != NULL) { | |
345 | if (time_after(c->mfc_un.unres.expires, now)) { | |
346 | unsigned long interval = c->mfc_un.unres.expires - now; | |
347 | if (interval < expires) | |
348 | expires = interval; | |
349 | cp = &c->next; | |
350 | continue; | |
351 | } | |
352 | ||
353 | *cp = c->next; | |
354 | ||
355 | ipmr_destroy_unres(c); | |
356 | } | |
357 | ||
358 | if (atomic_read(&cache_resolve_queue_len)) | |
359 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
360 | ||
361 | out: | |
362 | spin_unlock(&mfc_unres_lock); | |
363 | } | |
364 | ||
365 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
366 | ||
d1b04c08 | 367 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
368 | { |
369 | int vifi; | |
370 | ||
371 | cache->mfc_un.res.minvif = MAXVIFS; | |
372 | cache->mfc_un.res.maxvif = 0; | |
373 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
374 | ||
375 | for (vifi=0; vifi<maxvif; vifi++) { | |
376 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
377 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
378 | if (cache->mfc_un.res.minvif > vifi) | |
379 | cache->mfc_un.res.minvif = vifi; | |
380 | if (cache->mfc_un.res.maxvif <= vifi) | |
381 | cache->mfc_un.res.maxvif = vifi + 1; | |
382 | } | |
383 | } | |
384 | } | |
385 | ||
386 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
387 | { | |
388 | int vifi = vifc->vifc_vifi; | |
389 | struct vif_device *v = &vif_table[vifi]; | |
390 | struct net_device *dev; | |
391 | struct in_device *in_dev; | |
392 | ||
393 | /* Is vif busy ? */ | |
394 | if (VIF_EXISTS(vifi)) | |
395 | return -EADDRINUSE; | |
396 | ||
397 | switch (vifc->vifc_flags) { | |
398 | #ifdef CONFIG_IP_PIMSM | |
399 | case VIFF_REGISTER: | |
400 | /* | |
401 | * Special Purpose VIF in PIM | |
402 | * All the packets will be sent to the daemon | |
403 | */ | |
404 | if (reg_vif_num >= 0) | |
405 | return -EADDRINUSE; | |
406 | dev = ipmr_reg_vif(); | |
407 | if (!dev) | |
408 | return -ENOBUFS; | |
409 | break; | |
410 | #endif | |
e905a9ed | 411 | case VIFF_TUNNEL: |
1da177e4 LT |
412 | dev = ipmr_new_tunnel(vifc); |
413 | if (!dev) | |
414 | return -ENOBUFS; | |
415 | break; | |
416 | case 0: | |
15333061 | 417 | dev = ip_dev_find(vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
418 | if (!dev) |
419 | return -EADDRNOTAVAIL; | |
15333061 | 420 | dev_put(dev); |
1da177e4 LT |
421 | break; |
422 | default: | |
423 | return -EINVAL; | |
424 | } | |
425 | ||
e5ed6399 | 426 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 LT |
427 | return -EADDRNOTAVAIL; |
428 | in_dev->cnf.mc_forwarding++; | |
429 | dev_set_allmulti(dev, +1); | |
430 | ip_rt_multicast_event(in_dev); | |
431 | ||
432 | /* | |
433 | * Fill in the VIF structures | |
434 | */ | |
435 | v->rate_limit=vifc->vifc_rate_limit; | |
436 | v->local=vifc->vifc_lcl_addr.s_addr; | |
437 | v->remote=vifc->vifc_rmt_addr.s_addr; | |
438 | v->flags=vifc->vifc_flags; | |
439 | if (!mrtsock) | |
440 | v->flags |= VIFF_STATIC; | |
441 | v->threshold=vifc->vifc_threshold; | |
442 | v->bytes_in = 0; | |
443 | v->bytes_out = 0; | |
444 | v->pkt_in = 0; | |
445 | v->pkt_out = 0; | |
446 | v->link = dev->ifindex; | |
447 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
448 | v->link = dev->iflink; | |
449 | ||
450 | /* And finish update writing critical data */ | |
451 | write_lock_bh(&mrt_lock); | |
452 | dev_hold(dev); | |
453 | v->dev=dev; | |
454 | #ifdef CONFIG_IP_PIMSM | |
455 | if (v->flags&VIFF_REGISTER) | |
456 | reg_vif_num = vifi; | |
457 | #endif | |
458 | if (vifi+1 > maxvif) | |
459 | maxvif = vifi+1; | |
460 | write_unlock_bh(&mrt_lock); | |
461 | return 0; | |
462 | } | |
463 | ||
114c7844 | 464 | static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp) |
1da177e4 LT |
465 | { |
466 | int line=MFC_HASH(mcastgrp,origin); | |
467 | struct mfc_cache *c; | |
468 | ||
469 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
470 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
471 | break; | |
472 | } | |
473 | return c; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Allocate a multicast cache entry | |
478 | */ | |
479 | static struct mfc_cache *ipmr_cache_alloc(void) | |
480 | { | |
c3762229 | 481 | struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
132adf54 | 482 | if (c==NULL) |
1da177e4 | 483 | return NULL; |
1da177e4 LT |
484 | c->mfc_un.res.minvif = MAXVIFS; |
485 | return c; | |
486 | } | |
487 | ||
488 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
489 | { | |
c3762229 | 490 | struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
132adf54 | 491 | if (c==NULL) |
1da177e4 | 492 | return NULL; |
1da177e4 LT |
493 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
494 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
495 | return c; | |
496 | } | |
497 | ||
498 | /* | |
499 | * A cache entry has gone into a resolved state from queued | |
500 | */ | |
e905a9ed | 501 | |
1da177e4 LT |
502 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
503 | { | |
504 | struct sk_buff *skb; | |
9ef1d4c7 | 505 | struct nlmsgerr *e; |
1da177e4 LT |
506 | |
507 | /* | |
508 | * Play the pending entries through our router | |
509 | */ | |
510 | ||
132adf54 | 511 | while ((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 512 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
513 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
514 | ||
515 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
516 | nlh->nlmsg_len = skb->tail - (u8*)nlh; | |
517 | } else { | |
518 | nlh->nlmsg_type = NLMSG_ERROR; | |
519 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
520 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
521 | e = NLMSG_DATA(nlh); |
522 | e->error = -EMSGSIZE; | |
523 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 524 | } |
2942e900 TG |
525 | |
526 | rtnl_unicast(skb, NETLINK_CB(skb).pid); | |
1da177e4 LT |
527 | } else |
528 | ip_mr_forward(skb, c, 0); | |
529 | } | |
530 | } | |
531 | ||
532 | /* | |
533 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
534 | * expects the following bizarre scheme. | |
535 | * | |
536 | * Called under mrt_lock. | |
537 | */ | |
e905a9ed | 538 | |
1da177e4 LT |
539 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
540 | { | |
541 | struct sk_buff *skb; | |
c9bdd4b5 | 542 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
543 | struct igmphdr *igmp; |
544 | struct igmpmsg *msg; | |
545 | int ret; | |
546 | ||
547 | #ifdef CONFIG_IP_PIMSM | |
548 | if (assert == IGMPMSG_WHOLEPKT) | |
549 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
550 | else | |
551 | #endif | |
552 | skb = alloc_skb(128, GFP_ATOMIC); | |
553 | ||
132adf54 | 554 | if (!skb) |
1da177e4 LT |
555 | return -ENOBUFS; |
556 | ||
557 | #ifdef CONFIG_IP_PIMSM | |
558 | if (assert == IGMPMSG_WHOLEPKT) { | |
559 | /* Ugly, but we have no choice with this interface. | |
560 | Duplicate old header, fix ihl, length etc. | |
561 | And all this only to mangle msg->im_msgtype and | |
562 | to set msg->im_mbz to "mbz" :-) | |
563 | */ | |
878c8145 ACM |
564 | skb_push(skb, sizeof(struct iphdr)); |
565 | skb_reset_network_header(skb); | |
badff6d0 | 566 | skb_reset_transport_header(skb); |
0272ffc4 | 567 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 568 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
569 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
570 | msg->im_mbz = 0; | |
e905a9ed | 571 | msg->im_vif = reg_vif_num; |
eddc9ec5 ACM |
572 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
573 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
574 | sizeof(struct iphdr)); | |
e905a9ed | 575 | } else |
1da177e4 | 576 | #endif |
e905a9ed YH |
577 | { |
578 | ||
1da177e4 LT |
579 | /* |
580 | * Copy the IP header | |
581 | */ | |
582 | ||
ddc7b8e3 ACM |
583 | skb_set_network_header(skb, skb->tail - skb->data); |
584 | skb_put(skb, ihl); | |
1da177e4 | 585 | memcpy(skb->data,pkt->data,ihl); |
eddc9ec5 ACM |
586 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
587 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
588 | msg->im_vif = vifi; |
589 | skb->dst = dst_clone(pkt->dst); | |
590 | ||
591 | /* | |
592 | * Add our header | |
593 | */ | |
594 | ||
595 | igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); | |
596 | igmp->type = | |
597 | msg->im_msgtype = assert; | |
598 | igmp->code = 0; | |
eddc9ec5 | 599 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 600 | skb->transport_header = skb->network_header; |
e905a9ed | 601 | } |
1da177e4 LT |
602 | |
603 | if (mroute_socket == NULL) { | |
604 | kfree_skb(skb); | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Deliver to mrouted | |
610 | */ | |
611 | if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { | |
612 | if (net_ratelimit()) | |
613 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
614 | kfree_skb(skb); | |
615 | } | |
616 | ||
617 | return ret; | |
618 | } | |
619 | ||
620 | /* | |
621 | * Queue a packet for resolution. It gets locked cache entry! | |
622 | */ | |
e905a9ed | 623 | |
1da177e4 LT |
624 | static int |
625 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
626 | { | |
627 | int err; | |
628 | struct mfc_cache *c; | |
eddc9ec5 | 629 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
630 | |
631 | spin_lock_bh(&mfc_unres_lock); | |
632 | for (c=mfc_unres_queue; c; c=c->next) { | |
eddc9ec5 ACM |
633 | if (c->mfc_mcastgrp == iph->daddr && |
634 | c->mfc_origin == iph->saddr) | |
1da177e4 LT |
635 | break; |
636 | } | |
637 | ||
638 | if (c == NULL) { | |
639 | /* | |
640 | * Create a new entry if allowable | |
641 | */ | |
642 | ||
643 | if (atomic_read(&cache_resolve_queue_len)>=10 || | |
644 | (c=ipmr_cache_alloc_unres())==NULL) { | |
645 | spin_unlock_bh(&mfc_unres_lock); | |
646 | ||
647 | kfree_skb(skb); | |
648 | return -ENOBUFS; | |
649 | } | |
650 | ||
651 | /* | |
652 | * Fill in the new cache entry | |
653 | */ | |
eddc9ec5 ACM |
654 | c->mfc_parent = -1; |
655 | c->mfc_origin = iph->saddr; | |
656 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
657 | |
658 | /* | |
659 | * Reflect first query at mrouted. | |
660 | */ | |
661 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
e905a9ed | 662 | /* If the report failed throw the cache entry |
1da177e4 LT |
663 | out - Brad Parker |
664 | */ | |
665 | spin_unlock_bh(&mfc_unres_lock); | |
666 | ||
667 | kmem_cache_free(mrt_cachep, c); | |
668 | kfree_skb(skb); | |
669 | return err; | |
670 | } | |
671 | ||
672 | atomic_inc(&cache_resolve_queue_len); | |
673 | c->next = mfc_unres_queue; | |
674 | mfc_unres_queue = c; | |
675 | ||
676 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
677 | } | |
678 | ||
679 | /* | |
680 | * See if we can append the packet | |
681 | */ | |
682 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
683 | kfree_skb(skb); | |
684 | err = -ENOBUFS; | |
685 | } else { | |
686 | skb_queue_tail(&c->mfc_un.unres.unresolved,skb); | |
687 | err = 0; | |
688 | } | |
689 | ||
690 | spin_unlock_bh(&mfc_unres_lock); | |
691 | return err; | |
692 | } | |
693 | ||
694 | /* | |
695 | * MFC cache manipulation by user space mroute daemon | |
696 | */ | |
697 | ||
698 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
699 | { | |
700 | int line; | |
701 | struct mfc_cache *c, **cp; | |
702 | ||
703 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
704 | ||
705 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
706 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
707 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
708 | write_lock_bh(&mrt_lock); | |
709 | *cp = c->next; | |
710 | write_unlock_bh(&mrt_lock); | |
711 | ||
712 | kmem_cache_free(mrt_cachep, c); | |
713 | return 0; | |
714 | } | |
715 | } | |
716 | return -ENOENT; | |
717 | } | |
718 | ||
719 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
720 | { | |
721 | int line; | |
722 | struct mfc_cache *uc, *c, **cp; | |
723 | ||
724 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
725 | ||
726 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
727 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
728 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
729 | break; | |
730 | } | |
731 | ||
732 | if (c != NULL) { | |
733 | write_lock_bh(&mrt_lock); | |
734 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 735 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
736 | if (!mrtsock) |
737 | c->mfc_flags |= MFC_STATIC; | |
738 | write_unlock_bh(&mrt_lock); | |
739 | return 0; | |
740 | } | |
741 | ||
132adf54 | 742 | if (!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
743 | return -EINVAL; |
744 | ||
745 | c=ipmr_cache_alloc(); | |
746 | if (c==NULL) | |
747 | return -ENOMEM; | |
748 | ||
749 | c->mfc_origin=mfc->mfcc_origin.s_addr; | |
750 | c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; | |
751 | c->mfc_parent=mfc->mfcc_parent; | |
d1b04c08 | 752 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
753 | if (!mrtsock) |
754 | c->mfc_flags |= MFC_STATIC; | |
755 | ||
756 | write_lock_bh(&mrt_lock); | |
757 | c->next = mfc_cache_array[line]; | |
758 | mfc_cache_array[line] = c; | |
759 | write_unlock_bh(&mrt_lock); | |
760 | ||
761 | /* | |
762 | * Check to see if we resolved a queued list. If so we | |
763 | * need to send on the frames and tidy up. | |
764 | */ | |
765 | spin_lock_bh(&mfc_unres_lock); | |
766 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
767 | cp = &uc->next) { | |
768 | if (uc->mfc_origin == c->mfc_origin && | |
769 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
770 | *cp = uc->next; | |
771 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
772 | del_timer(&ipmr_expire_timer); | |
773 | break; | |
774 | } | |
775 | } | |
776 | spin_unlock_bh(&mfc_unres_lock); | |
777 | ||
778 | if (uc) { | |
779 | ipmr_cache_resolve(uc, c); | |
780 | kmem_cache_free(mrt_cachep, uc); | |
781 | } | |
782 | return 0; | |
783 | } | |
784 | ||
785 | /* | |
786 | * Close the multicast socket, and clear the vif tables etc | |
787 | */ | |
e905a9ed | 788 | |
1da177e4 LT |
789 | static void mroute_clean_tables(struct sock *sk) |
790 | { | |
791 | int i; | |
e905a9ed | 792 | |
1da177e4 LT |
793 | /* |
794 | * Shut down all active vif entries | |
795 | */ | |
132adf54 | 796 | for (i=0; i<maxvif; i++) { |
1da177e4 LT |
797 | if (!(vif_table[i].flags&VIFF_STATIC)) |
798 | vif_delete(i); | |
799 | } | |
800 | ||
801 | /* | |
802 | * Wipe the cache | |
803 | */ | |
804 | for (i=0;i<MFC_LINES;i++) { | |
805 | struct mfc_cache *c, **cp; | |
806 | ||
807 | cp = &mfc_cache_array[i]; | |
808 | while ((c = *cp) != NULL) { | |
809 | if (c->mfc_flags&MFC_STATIC) { | |
810 | cp = &c->next; | |
811 | continue; | |
812 | } | |
813 | write_lock_bh(&mrt_lock); | |
814 | *cp = c->next; | |
815 | write_unlock_bh(&mrt_lock); | |
816 | ||
817 | kmem_cache_free(mrt_cachep, c); | |
818 | } | |
819 | } | |
820 | ||
821 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
822 | struct mfc_cache *c; | |
823 | ||
824 | spin_lock_bh(&mfc_unres_lock); | |
825 | while (mfc_unres_queue != NULL) { | |
826 | c = mfc_unres_queue; | |
827 | mfc_unres_queue = c->next; | |
828 | spin_unlock_bh(&mfc_unres_lock); | |
829 | ||
830 | ipmr_destroy_unres(c); | |
831 | ||
832 | spin_lock_bh(&mfc_unres_lock); | |
833 | } | |
834 | spin_unlock_bh(&mfc_unres_lock); | |
835 | } | |
836 | } | |
837 | ||
838 | static void mrtsock_destruct(struct sock *sk) | |
839 | { | |
840 | rtnl_lock(); | |
841 | if (sk == mroute_socket) { | |
842 | ipv4_devconf.mc_forwarding--; | |
843 | ||
844 | write_lock_bh(&mrt_lock); | |
845 | mroute_socket=NULL; | |
846 | write_unlock_bh(&mrt_lock); | |
847 | ||
848 | mroute_clean_tables(sk); | |
849 | } | |
850 | rtnl_unlock(); | |
851 | } | |
852 | ||
853 | /* | |
854 | * Socket options and virtual interface manipulation. The whole | |
855 | * virtual interface system is a complete heap, but unfortunately | |
856 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
857 | * MOSPF/PIM router set up we can clean this up. | |
858 | */ | |
e905a9ed | 859 | |
1da177e4 LT |
860 | int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) |
861 | { | |
862 | int ret; | |
863 | struct vifctl vif; | |
864 | struct mfcctl mfc; | |
e905a9ed | 865 | |
132adf54 SH |
866 | if (optname != MRT_INIT) { |
867 | if (sk != mroute_socket && !capable(CAP_NET_ADMIN)) | |
1da177e4 LT |
868 | return -EACCES; |
869 | } | |
870 | ||
132adf54 SH |
871 | switch (optname) { |
872 | case MRT_INIT: | |
873 | if (sk->sk_type != SOCK_RAW || | |
874 | inet_sk(sk)->num != IPPROTO_IGMP) | |
875 | return -EOPNOTSUPP; | |
876 | if (optlen!=sizeof(int)) | |
877 | return -ENOPROTOOPT; | |
1da177e4 | 878 | |
132adf54 SH |
879 | rtnl_lock(); |
880 | if (mroute_socket) { | |
1da177e4 | 881 | rtnl_unlock(); |
132adf54 SH |
882 | return -EADDRINUSE; |
883 | } | |
884 | ||
885 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
886 | if (ret == 0) { | |
887 | write_lock_bh(&mrt_lock); | |
888 | mroute_socket=sk; | |
889 | write_unlock_bh(&mrt_lock); | |
890 | ||
891 | ipv4_devconf.mc_forwarding++; | |
892 | } | |
893 | rtnl_unlock(); | |
894 | return ret; | |
895 | case MRT_DONE: | |
896 | if (sk!=mroute_socket) | |
897 | return -EACCES; | |
898 | return ip_ra_control(sk, 0, NULL); | |
899 | case MRT_ADD_VIF: | |
900 | case MRT_DEL_VIF: | |
901 | if (optlen!=sizeof(vif)) | |
902 | return -EINVAL; | |
903 | if (copy_from_user(&vif,optval,sizeof(vif))) | |
904 | return -EFAULT; | |
905 | if (vif.vifc_vifi >= MAXVIFS) | |
906 | return -ENFILE; | |
907 | rtnl_lock(); | |
908 | if (optname==MRT_ADD_VIF) { | |
909 | ret = vif_add(&vif, sk==mroute_socket); | |
910 | } else { | |
911 | ret = vif_delete(vif.vifc_vifi); | |
912 | } | |
913 | rtnl_unlock(); | |
914 | return ret; | |
1da177e4 LT |
915 | |
916 | /* | |
917 | * Manipulate the forwarding caches. These live | |
918 | * in a sort of kernel/user symbiosis. | |
919 | */ | |
132adf54 SH |
920 | case MRT_ADD_MFC: |
921 | case MRT_DEL_MFC: | |
922 | if (optlen!=sizeof(mfc)) | |
923 | return -EINVAL; | |
924 | if (copy_from_user(&mfc,optval, sizeof(mfc))) | |
925 | return -EFAULT; | |
926 | rtnl_lock(); | |
927 | if (optname==MRT_DEL_MFC) | |
928 | ret = ipmr_mfc_delete(&mfc); | |
929 | else | |
930 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); | |
931 | rtnl_unlock(); | |
932 | return ret; | |
1da177e4 LT |
933 | /* |
934 | * Control PIM assert. | |
935 | */ | |
132adf54 SH |
936 | case MRT_ASSERT: |
937 | { | |
938 | int v; | |
939 | if (get_user(v,(int __user *)optval)) | |
940 | return -EFAULT; | |
941 | mroute_do_assert=(v)?1:0; | |
942 | return 0; | |
943 | } | |
1da177e4 | 944 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
945 | case MRT_PIM: |
946 | { | |
947 | int v, ret; | |
948 | if (get_user(v,(int __user *)optval)) | |
949 | return -EFAULT; | |
950 | v = (v)?1:0; | |
951 | rtnl_lock(); | |
952 | ret = 0; | |
953 | if (v != mroute_do_pim) { | |
954 | mroute_do_pim = v; | |
955 | mroute_do_assert = v; | |
1da177e4 | 956 | #ifdef CONFIG_IP_PIMSM_V2 |
132adf54 SH |
957 | if (mroute_do_pim) |
958 | ret = inet_add_protocol(&pim_protocol, | |
959 | IPPROTO_PIM); | |
960 | else | |
961 | ret = inet_del_protocol(&pim_protocol, | |
962 | IPPROTO_PIM); | |
963 | if (ret < 0) | |
964 | ret = -EAGAIN; | |
1da177e4 | 965 | #endif |
1da177e4 | 966 | } |
132adf54 SH |
967 | rtnl_unlock(); |
968 | return ret; | |
969 | } | |
1da177e4 | 970 | #endif |
132adf54 SH |
971 | /* |
972 | * Spurious command, or MRT_VERSION which you cannot | |
973 | * set. | |
974 | */ | |
975 | default: | |
976 | return -ENOPROTOOPT; | |
1da177e4 LT |
977 | } |
978 | } | |
979 | ||
980 | /* | |
981 | * Getsock opt support for the multicast routing system. | |
982 | */ | |
e905a9ed | 983 | |
1da177e4 LT |
984 | int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) |
985 | { | |
986 | int olr; | |
987 | int val; | |
988 | ||
132adf54 | 989 | if (optname!=MRT_VERSION && |
1da177e4 LT |
990 | #ifdef CONFIG_IP_PIMSM |
991 | optname!=MRT_PIM && | |
992 | #endif | |
993 | optname!=MRT_ASSERT) | |
994 | return -ENOPROTOOPT; | |
995 | ||
996 | if (get_user(olr, optlen)) | |
997 | return -EFAULT; | |
998 | ||
999 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1000 | if (olr < 0) | |
1001 | return -EINVAL; | |
e905a9ed | 1002 | |
132adf54 | 1003 | if (put_user(olr,optlen)) |
1da177e4 | 1004 | return -EFAULT; |
132adf54 | 1005 | if (optname==MRT_VERSION) |
1da177e4 LT |
1006 | val=0x0305; |
1007 | #ifdef CONFIG_IP_PIMSM | |
132adf54 | 1008 | else if (optname==MRT_PIM) |
1da177e4 LT |
1009 | val=mroute_do_pim; |
1010 | #endif | |
1011 | else | |
1012 | val=mroute_do_assert; | |
132adf54 | 1013 | if (copy_to_user(optval,&val,olr)) |
1da177e4 LT |
1014 | return -EFAULT; |
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * The IP multicast ioctl support routines. | |
1020 | */ | |
e905a9ed | 1021 | |
1da177e4 LT |
1022 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1023 | { | |
1024 | struct sioc_sg_req sr; | |
1025 | struct sioc_vif_req vr; | |
1026 | struct vif_device *vif; | |
1027 | struct mfc_cache *c; | |
e905a9ed | 1028 | |
132adf54 SH |
1029 | switch (cmd) { |
1030 | case SIOCGETVIFCNT: | |
1031 | if (copy_from_user(&vr,arg,sizeof(vr))) | |
1032 | return -EFAULT; | |
1033 | if (vr.vifi>=maxvif) | |
1034 | return -EINVAL; | |
1035 | read_lock(&mrt_lock); | |
1036 | vif=&vif_table[vr.vifi]; | |
1037 | if (VIF_EXISTS(vr.vifi)) { | |
1038 | vr.icount=vif->pkt_in; | |
1039 | vr.ocount=vif->pkt_out; | |
1040 | vr.ibytes=vif->bytes_in; | |
1041 | vr.obytes=vif->bytes_out; | |
1da177e4 | 1042 | read_unlock(&mrt_lock); |
1da177e4 | 1043 | |
132adf54 SH |
1044 | if (copy_to_user(arg,&vr,sizeof(vr))) |
1045 | return -EFAULT; | |
1046 | return 0; | |
1047 | } | |
1048 | read_unlock(&mrt_lock); | |
1049 | return -EADDRNOTAVAIL; | |
1050 | case SIOCGETSGCNT: | |
1051 | if (copy_from_user(&sr,arg,sizeof(sr))) | |
1052 | return -EFAULT; | |
1053 | ||
1054 | read_lock(&mrt_lock); | |
1055 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1056 | if (c) { | |
1057 | sr.pktcnt = c->mfc_un.res.pkt; | |
1058 | sr.bytecnt = c->mfc_un.res.bytes; | |
1059 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1060 | read_unlock(&mrt_lock); |
132adf54 SH |
1061 | |
1062 | if (copy_to_user(arg,&sr,sizeof(sr))) | |
1063 | return -EFAULT; | |
1064 | return 0; | |
1065 | } | |
1066 | read_unlock(&mrt_lock); | |
1067 | return -EADDRNOTAVAIL; | |
1068 | default: | |
1069 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1070 | } |
1071 | } | |
1072 | ||
1073 | ||
1074 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1075 | { | |
1076 | struct vif_device *v; | |
1077 | int ct; | |
1078 | if (event != NETDEV_UNREGISTER) | |
1079 | return NOTIFY_DONE; | |
1080 | v=&vif_table[0]; | |
132adf54 | 1081 | for (ct=0;ct<maxvif;ct++,v++) { |
1da177e4 LT |
1082 | if (v->dev==ptr) |
1083 | vif_delete(ct); | |
1084 | } | |
1085 | return NOTIFY_DONE; | |
1086 | } | |
1087 | ||
1088 | ||
1089 | static struct notifier_block ip_mr_notifier={ | |
1090 | .notifier_call = ipmr_device_event, | |
1091 | }; | |
1092 | ||
1093 | /* | |
1094 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1095 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1096 | * important for multicast video. | |
1097 | */ | |
e905a9ed | 1098 | |
114c7844 | 1099 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1100 | { |
8856dfa3 | 1101 | struct iphdr *iph; |
eddc9ec5 | 1102 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1103 | |
1104 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1105 | skb->transport_header = skb->network_header; |
8856dfa3 | 1106 | skb_reset_network_header(skb); |
eddc9ec5 | 1107 | iph = ip_hdr(skb); |
1da177e4 LT |
1108 | |
1109 | iph->version = 4; | |
e023dd64 ACM |
1110 | iph->tos = old_iph->tos; |
1111 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1112 | iph->frag_off = 0; |
1113 | iph->daddr = daddr; | |
1114 | iph->saddr = saddr; | |
1115 | iph->protocol = IPPROTO_IPIP; | |
1116 | iph->ihl = 5; | |
1117 | iph->tot_len = htons(skb->len); | |
1118 | ip_select_ident(iph, skb->dst, NULL); | |
1119 | ip_send_check(iph); | |
1120 | ||
1da177e4 LT |
1121 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1122 | nf_reset(skb); | |
1123 | } | |
1124 | ||
1125 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1126 | { | |
1127 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1128 | ||
1129 | IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
1130 | ||
1131 | if (unlikely(opt->optlen)) | |
1132 | ip_forward_options(skb); | |
1133 | ||
1134 | return dst_output(skb); | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Processing handlers for ipmr_forward | |
1139 | */ | |
1140 | ||
1141 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1142 | { | |
eddc9ec5 | 1143 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1144 | struct vif_device *vif = &vif_table[vifi]; |
1145 | struct net_device *dev; | |
1146 | struct rtable *rt; | |
1147 | int encap = 0; | |
1148 | ||
1149 | if (vif->dev == NULL) | |
1150 | goto out_free; | |
1151 | ||
1152 | #ifdef CONFIG_IP_PIMSM | |
1153 | if (vif->flags & VIFF_REGISTER) { | |
1154 | vif->pkt_out++; | |
1155 | vif->bytes_out+=skb->len; | |
2941a486 PM |
1156 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_bytes += skb->len; |
1157 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_packets++; | |
1da177e4 LT |
1158 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
1159 | kfree_skb(skb); | |
1160 | return; | |
1161 | } | |
1162 | #endif | |
1163 | ||
1164 | if (vif->flags&VIFF_TUNNEL) { | |
1165 | struct flowi fl = { .oif = vif->link, | |
1166 | .nl_u = { .ip4_u = | |
1167 | { .daddr = vif->remote, | |
1168 | .saddr = vif->local, | |
1169 | .tos = RT_TOS(iph->tos) } }, | |
1170 | .proto = IPPROTO_IPIP }; | |
1171 | if (ip_route_output_key(&rt, &fl)) | |
1172 | goto out_free; | |
1173 | encap = sizeof(struct iphdr); | |
1174 | } else { | |
1175 | struct flowi fl = { .oif = vif->link, | |
1176 | .nl_u = { .ip4_u = | |
1177 | { .daddr = iph->daddr, | |
1178 | .tos = RT_TOS(iph->tos) } }, | |
1179 | .proto = IPPROTO_IPIP }; | |
1180 | if (ip_route_output_key(&rt, &fl)) | |
1181 | goto out_free; | |
1182 | } | |
1183 | ||
1184 | dev = rt->u.dst.dev; | |
1185 | ||
1186 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1187 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1188 | allow to send ICMP, so that packets will disappear | |
1189 | to blackhole. | |
1190 | */ | |
1191 | ||
1192 | IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
1193 | ip_rt_put(rt); | |
1194 | goto out_free; | |
1195 | } | |
1196 | ||
1197 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1198 | ||
1199 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1200 | ip_rt_put(rt); |
1da177e4 LT |
1201 | goto out_free; |
1202 | } | |
1203 | ||
1204 | vif->pkt_out++; | |
1205 | vif->bytes_out+=skb->len; | |
1206 | ||
1207 | dst_release(skb->dst); | |
1208 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1209 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1210 | |
1211 | /* FIXME: forward and output firewalls used to be called here. | |
1212 | * What do we do with netfilter? -- RR */ | |
1213 | if (vif->flags & VIFF_TUNNEL) { | |
1214 | ip_encap(skb, vif->local, vif->remote); | |
1215 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2941a486 PM |
1216 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_packets++; |
1217 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_bytes+=skb->len; | |
1da177e4 LT |
1218 | } |
1219 | ||
1220 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1221 | ||
1222 | /* | |
1223 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1224 | * not only before forwarding, but after forwarding on all output | |
1225 | * interfaces. It is clear, if mrouter runs a multicasting | |
1226 | * program, it should receive packets not depending to what interface | |
1227 | * program is joined. | |
1228 | * If we will not make it, the program will have to join on all | |
1229 | * interfaces. On the other hand, multihoming host (or router, but | |
1230 | * not mrouter) cannot join to more than one interface - it will | |
1231 | * result in receiving multiple packets. | |
1232 | */ | |
e905a9ed | 1233 | NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1234 | ipmr_forward_finish); |
1235 | return; | |
1236 | ||
1237 | out_free: | |
1238 | kfree_skb(skb); | |
1239 | return; | |
1240 | } | |
1241 | ||
1242 | static int ipmr_find_vif(struct net_device *dev) | |
1243 | { | |
1244 | int ct; | |
1245 | for (ct=maxvif-1; ct>=0; ct--) { | |
1246 | if (vif_table[ct].dev == dev) | |
1247 | break; | |
1248 | } | |
1249 | return ct; | |
1250 | } | |
1251 | ||
1252 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1253 | ||
1254 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1255 | { | |
1256 | int psend = -1; | |
1257 | int vif, ct; | |
1258 | ||
1259 | vif = cache->mfc_parent; | |
1260 | cache->mfc_un.res.pkt++; | |
1261 | cache->mfc_un.res.bytes += skb->len; | |
1262 | ||
1263 | /* | |
1264 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1265 | */ | |
1266 | if (vif_table[vif].dev != skb->dev) { | |
1267 | int true_vifi; | |
1268 | ||
1269 | if (((struct rtable*)skb->dst)->fl.iif == 0) { | |
1270 | /* It is our own packet, looped back. | |
1271 | Very complicated situation... | |
1272 | ||
1273 | The best workaround until routing daemons will be | |
1274 | fixed is not to redistribute packet, if it was | |
1275 | send through wrong interface. It means, that | |
1276 | multicast applications WILL NOT work for | |
1277 | (S,G), which have default multicast route pointing | |
1278 | to wrong oif. In any case, it is not a good | |
1279 | idea to use multicasting applications on router. | |
1280 | */ | |
1281 | goto dont_forward; | |
1282 | } | |
1283 | ||
1284 | cache->mfc_un.res.wrong_if++; | |
1285 | true_vifi = ipmr_find_vif(skb->dev); | |
1286 | ||
1287 | if (true_vifi >= 0 && mroute_do_assert && | |
1288 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1289 | so that we cannot check that packet arrived on an oif. | |
1290 | It is bad, but otherwise we would need to move pretty | |
1291 | large chunk of pimd to kernel. Ough... --ANK | |
1292 | */ | |
1293 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
e905a9ed | 1294 | time_after(jiffies, |
1da177e4 LT |
1295 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1296 | cache->mfc_un.res.last_assert = jiffies; | |
1297 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1298 | } | |
1299 | goto dont_forward; | |
1300 | } | |
1301 | ||
1302 | vif_table[vif].pkt_in++; | |
1303 | vif_table[vif].bytes_in+=skb->len; | |
1304 | ||
1305 | /* | |
1306 | * Forward the frame | |
1307 | */ | |
1308 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1309 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1310 | if (psend != -1) { |
1311 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1312 | if (skb2) | |
1313 | ipmr_queue_xmit(skb2, cache, psend); | |
1314 | } | |
1315 | psend=ct; | |
1316 | } | |
1317 | } | |
1318 | if (psend != -1) { | |
1319 | if (local) { | |
1320 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1321 | if (skb2) | |
1322 | ipmr_queue_xmit(skb2, cache, psend); | |
1323 | } else { | |
1324 | ipmr_queue_xmit(skb, cache, psend); | |
1325 | return 0; | |
1326 | } | |
1327 | } | |
1328 | ||
1329 | dont_forward: | |
1330 | if (!local) | |
1331 | kfree_skb(skb); | |
1332 | return 0; | |
1333 | } | |
1334 | ||
1335 | ||
1336 | /* | |
1337 | * Multicast packets for forwarding arrive here | |
1338 | */ | |
1339 | ||
1340 | int ip_mr_input(struct sk_buff *skb) | |
1341 | { | |
1342 | struct mfc_cache *cache; | |
1343 | int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; | |
1344 | ||
1345 | /* Packet is looped back after forward, it should not be | |
1346 | forwarded second time, but still can be delivered locally. | |
1347 | */ | |
1348 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1349 | goto dont_forward; | |
1350 | ||
1351 | if (!local) { | |
1352 | if (IPCB(skb)->opt.router_alert) { | |
1353 | if (ip_call_ra_chain(skb)) | |
1354 | return 0; | |
eddc9ec5 | 1355 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1356 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1357 | Cisco IOS <= 11.2(8)) do not put router alert | |
1358 | option to IGMP packets destined to routable | |
1359 | groups. It is very bad, because it means | |
1360 | that we can forward NO IGMP messages. | |
1361 | */ | |
1362 | read_lock(&mrt_lock); | |
1363 | if (mroute_socket) { | |
2715bcf9 | 1364 | nf_reset(skb); |
1da177e4 LT |
1365 | raw_rcv(mroute_socket, skb); |
1366 | read_unlock(&mrt_lock); | |
1367 | return 0; | |
1368 | } | |
1369 | read_unlock(&mrt_lock); | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | read_lock(&mrt_lock); | |
eddc9ec5 | 1374 | cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1375 | |
1376 | /* | |
1377 | * No usable cache entry | |
1378 | */ | |
1379 | if (cache==NULL) { | |
1380 | int vif; | |
1381 | ||
1382 | if (local) { | |
1383 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1384 | ip_local_deliver(skb); | |
1385 | if (skb2 == NULL) { | |
1386 | read_unlock(&mrt_lock); | |
1387 | return -ENOBUFS; | |
1388 | } | |
1389 | skb = skb2; | |
1390 | } | |
1391 | ||
1392 | vif = ipmr_find_vif(skb->dev); | |
1393 | if (vif >= 0) { | |
1394 | int err = ipmr_cache_unresolved(vif, skb); | |
1395 | read_unlock(&mrt_lock); | |
1396 | ||
1397 | return err; | |
1398 | } | |
1399 | read_unlock(&mrt_lock); | |
1400 | kfree_skb(skb); | |
1401 | return -ENODEV; | |
1402 | } | |
1403 | ||
1404 | ip_mr_forward(skb, cache, local); | |
1405 | ||
1406 | read_unlock(&mrt_lock); | |
1407 | ||
1408 | if (local) | |
1409 | return ip_local_deliver(skb); | |
1410 | ||
1411 | return 0; | |
1412 | ||
1413 | dont_forward: | |
1414 | if (local) | |
1415 | return ip_local_deliver(skb); | |
1416 | kfree_skb(skb); | |
1417 | return 0; | |
1418 | } | |
1419 | ||
1420 | #ifdef CONFIG_IP_PIMSM_V1 | |
1421 | /* | |
1422 | * Handle IGMP messages of PIMv1 | |
1423 | */ | |
1424 | ||
1425 | int pim_rcv_v1(struct sk_buff * skb) | |
1426 | { | |
1427 | struct igmphdr *pim; | |
1428 | struct iphdr *encap; | |
1429 | struct net_device *reg_dev = NULL; | |
1430 | ||
e905a9ed | 1431 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1432 | goto drop; |
1433 | ||
d9edf9e2 | 1434 | pim = igmp_hdr(skb); |
1da177e4 | 1435 | |
e905a9ed | 1436 | if (!mroute_do_pim || |
1da177e4 | 1437 | skb->len < sizeof(*pim) + sizeof(*encap) || |
e905a9ed | 1438 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1da177e4 LT |
1439 | goto drop; |
1440 | ||
9c70220b ACM |
1441 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1442 | sizeof(struct igmphdr)); | |
1da177e4 LT |
1443 | /* |
1444 | Check that: | |
1445 | a. packet is really destinted to a multicast group | |
1446 | b. packet is not a NULL-REGISTER | |
1447 | c. packet is not truncated | |
1448 | */ | |
1449 | if (!MULTICAST(encap->daddr) || | |
1450 | encap->tot_len == 0 || | |
e905a9ed | 1451 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1452 | goto drop; |
1453 | ||
1454 | read_lock(&mrt_lock); | |
1455 | if (reg_vif_num >= 0) | |
1456 | reg_dev = vif_table[reg_vif_num].dev; | |
1457 | if (reg_dev) | |
1458 | dev_hold(reg_dev); | |
1459 | read_unlock(&mrt_lock); | |
1460 | ||
e905a9ed | 1461 | if (reg_dev == NULL) |
1da177e4 LT |
1462 | goto drop; |
1463 | ||
b0e380b1 | 1464 | skb->mac_header = skb->network_header; |
1da177e4 | 1465 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1466 | skb_reset_network_header(skb); |
1da177e4 | 1467 | skb->dev = reg_dev; |
1da177e4 LT |
1468 | skb->protocol = htons(ETH_P_IP); |
1469 | skb->ip_summed = 0; | |
1470 | skb->pkt_type = PACKET_HOST; | |
1471 | dst_release(skb->dst); | |
1472 | skb->dst = NULL; | |
2941a486 PM |
1473 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
1474 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; | |
1da177e4 LT |
1475 | nf_reset(skb); |
1476 | netif_rx(skb); | |
1477 | dev_put(reg_dev); | |
1478 | return 0; | |
1479 | drop: | |
1480 | kfree_skb(skb); | |
1481 | return 0; | |
1482 | } | |
1483 | #endif | |
1484 | ||
1485 | #ifdef CONFIG_IP_PIMSM_V2 | |
1486 | static int pim_rcv(struct sk_buff * skb) | |
1487 | { | |
1488 | struct pimreghdr *pim; | |
1489 | struct iphdr *encap; | |
1490 | struct net_device *reg_dev = NULL; | |
1491 | ||
e905a9ed | 1492 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1493 | goto drop; |
1494 | ||
9c70220b | 1495 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1496 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1497 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1498 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1499 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1500 | goto drop; |
1501 | ||
1502 | /* check if the inner packet is destined to mcast group */ | |
9c70220b ACM |
1503 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1504 | sizeof(struct pimreghdr)); | |
1da177e4 LT |
1505 | if (!MULTICAST(encap->daddr) || |
1506 | encap->tot_len == 0 || | |
e905a9ed | 1507 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1508 | goto drop; |
1509 | ||
1510 | read_lock(&mrt_lock); | |
1511 | if (reg_vif_num >= 0) | |
1512 | reg_dev = vif_table[reg_vif_num].dev; | |
1513 | if (reg_dev) | |
1514 | dev_hold(reg_dev); | |
1515 | read_unlock(&mrt_lock); | |
1516 | ||
e905a9ed | 1517 | if (reg_dev == NULL) |
1da177e4 LT |
1518 | goto drop; |
1519 | ||
b0e380b1 | 1520 | skb->mac_header = skb->network_header; |
1da177e4 | 1521 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1522 | skb_reset_network_header(skb); |
1da177e4 | 1523 | skb->dev = reg_dev; |
1da177e4 LT |
1524 | skb->protocol = htons(ETH_P_IP); |
1525 | skb->ip_summed = 0; | |
1526 | skb->pkt_type = PACKET_HOST; | |
1527 | dst_release(skb->dst); | |
2941a486 PM |
1528 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
1529 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; | |
1da177e4 LT |
1530 | skb->dst = NULL; |
1531 | nf_reset(skb); | |
1532 | netif_rx(skb); | |
1533 | dev_put(reg_dev); | |
1534 | return 0; | |
1535 | drop: | |
1536 | kfree_skb(skb); | |
1537 | return 0; | |
1538 | } | |
1539 | #endif | |
1540 | ||
1541 | static int | |
1542 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1543 | { | |
1544 | int ct; | |
1545 | struct rtnexthop *nhp; | |
1546 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
1547 | u8 *b = skb->tail; | |
1548 | struct rtattr *mp_head; | |
1549 | ||
1550 | if (dev) | |
1551 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1552 | ||
1553 | mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); | |
1554 | ||
1555 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1556 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1557 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1558 | goto rtattr_failure; | |
1559 | nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1560 | nhp->rtnh_flags = 0; | |
1561 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1562 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1563 | nhp->rtnh_len = sizeof(*nhp); | |
1564 | } | |
1565 | } | |
1566 | mp_head->rta_type = RTA_MULTIPATH; | |
1567 | mp_head->rta_len = skb->tail - (u8*)mp_head; | |
1568 | rtm->rtm_type = RTN_MULTICAST; | |
1569 | return 1; | |
1570 | ||
1571 | rtattr_failure: | |
1572 | skb_trim(skb, b - skb->data); | |
1573 | return -EMSGSIZE; | |
1574 | } | |
1575 | ||
1576 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1577 | { | |
1578 | int err; | |
1579 | struct mfc_cache *cache; | |
1580 | struct rtable *rt = (struct rtable*)skb->dst; | |
1581 | ||
1582 | read_lock(&mrt_lock); | |
1583 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1584 | ||
1585 | if (cache==NULL) { | |
72287490 | 1586 | struct sk_buff *skb2; |
eddc9ec5 | 1587 | struct iphdr *iph; |
1da177e4 LT |
1588 | struct net_device *dev; |
1589 | int vif; | |
1590 | ||
1591 | if (nowait) { | |
1592 | read_unlock(&mrt_lock); | |
1593 | return -EAGAIN; | |
1594 | } | |
1595 | ||
1596 | dev = skb->dev; | |
1597 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1598 | read_unlock(&mrt_lock); | |
1599 | return -ENODEV; | |
1600 | } | |
72287490 AK |
1601 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1602 | if (!skb2) { | |
1603 | read_unlock(&mrt_lock); | |
1604 | return -ENOMEM; | |
1605 | } | |
1606 | ||
e2d1bca7 ACM |
1607 | skb_push(skb2, sizeof(struct iphdr)); |
1608 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1609 | iph = ip_hdr(skb2); |
1610 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1611 | iph->saddr = rt->rt_src; | |
1612 | iph->daddr = rt->rt_dst; | |
1613 | iph->version = 0; | |
72287490 | 1614 | err = ipmr_cache_unresolved(vif, skb2); |
1da177e4 LT |
1615 | read_unlock(&mrt_lock); |
1616 | return err; | |
1617 | } | |
1618 | ||
1619 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1620 | cache->mfc_flags |= MFC_NOTIFY; | |
1621 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1622 | read_unlock(&mrt_lock); | |
1623 | return err; | |
1624 | } | |
1625 | ||
e905a9ed | 1626 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1627 | /* |
1628 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1629 | */ | |
1630 | struct ipmr_vif_iter { | |
1631 | int ct; | |
1632 | }; | |
1633 | ||
1634 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1635 | loff_t pos) | |
1636 | { | |
1637 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
132adf54 | 1638 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 | 1639 | continue; |
e905a9ed | 1640 | if (pos-- == 0) |
1da177e4 LT |
1641 | return &vif_table[iter->ct]; |
1642 | } | |
1643 | return NULL; | |
1644 | } | |
1645 | ||
1646 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
1647 | { | |
1648 | read_lock(&mrt_lock); | |
e905a9ed | 1649 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1650 | : SEQ_START_TOKEN; |
1651 | } | |
1652 | ||
1653 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1654 | { | |
1655 | struct ipmr_vif_iter *iter = seq->private; | |
1656 | ||
1657 | ++*pos; | |
1658 | if (v == SEQ_START_TOKEN) | |
1659 | return ipmr_vif_seq_idx(iter, 0); | |
e905a9ed | 1660 | |
1da177e4 | 1661 | while (++iter->ct < maxvif) { |
132adf54 | 1662 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 LT |
1663 | continue; |
1664 | return &vif_table[iter->ct]; | |
1665 | } | |
1666 | return NULL; | |
1667 | } | |
1668 | ||
1669 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
1670 | { | |
1671 | read_unlock(&mrt_lock); | |
1672 | } | |
1673 | ||
1674 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1675 | { | |
1676 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1677 | seq_puts(seq, |
1da177e4 LT |
1678 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1679 | } else { | |
1680 | const struct vif_device *vif = v; | |
1681 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1682 | ||
1683 | seq_printf(seq, | |
1684 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1685 | vif - vif_table, | |
e905a9ed | 1686 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1687 | vif->bytes_out, vif->pkt_out, |
1688 | vif->flags, vif->local, vif->remote); | |
1689 | } | |
1690 | return 0; | |
1691 | } | |
1692 | ||
f690808e | 1693 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1694 | .start = ipmr_vif_seq_start, |
1695 | .next = ipmr_vif_seq_next, | |
1696 | .stop = ipmr_vif_seq_stop, | |
1697 | .show = ipmr_vif_seq_show, | |
1698 | }; | |
1699 | ||
1700 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1701 | { | |
1702 | struct seq_file *seq; | |
1703 | int rc = -ENOMEM; | |
1704 | struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e905a9ed | 1705 | |
1da177e4 LT |
1706 | if (!s) |
1707 | goto out; | |
1708 | ||
1709 | rc = seq_open(file, &ipmr_vif_seq_ops); | |
1710 | if (rc) | |
1711 | goto out_kfree; | |
1712 | ||
1713 | s->ct = 0; | |
1714 | seq = file->private_data; | |
1715 | seq->private = s; | |
1716 | out: | |
1717 | return rc; | |
1718 | out_kfree: | |
1719 | kfree(s); | |
1720 | goto out; | |
1721 | ||
1722 | } | |
1723 | ||
9a32144e | 1724 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1725 | .owner = THIS_MODULE, |
1726 | .open = ipmr_vif_open, | |
1727 | .read = seq_read, | |
1728 | .llseek = seq_lseek, | |
1729 | .release = seq_release_private, | |
1730 | }; | |
1731 | ||
1732 | struct ipmr_mfc_iter { | |
1733 | struct mfc_cache **cache; | |
1734 | int ct; | |
1735 | }; | |
1736 | ||
1737 | ||
1738 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1739 | { | |
1740 | struct mfc_cache *mfc; | |
1741 | ||
1742 | it->cache = mfc_cache_array; | |
1743 | read_lock(&mrt_lock); | |
e905a9ed | 1744 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
132adf54 | 1745 | for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) |
e905a9ed | 1746 | if (pos-- == 0) |
1da177e4 LT |
1747 | return mfc; |
1748 | read_unlock(&mrt_lock); | |
1749 | ||
1750 | it->cache = &mfc_unres_queue; | |
1751 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1752 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
1da177e4 LT |
1753 | if (pos-- == 0) |
1754 | return mfc; | |
1755 | spin_unlock_bh(&mfc_unres_lock); | |
1756 | ||
1757 | it->cache = NULL; | |
1758 | return NULL; | |
1759 | } | |
1760 | ||
1761 | ||
1762 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1763 | { | |
1764 | struct ipmr_mfc_iter *it = seq->private; | |
1765 | it->cache = NULL; | |
1766 | it->ct = 0; | |
e905a9ed | 1767 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1768 | : SEQ_START_TOKEN; |
1769 | } | |
1770 | ||
1771 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1772 | { | |
1773 | struct mfc_cache *mfc = v; | |
1774 | struct ipmr_mfc_iter *it = seq->private; | |
1775 | ||
1776 | ++*pos; | |
1777 | ||
1778 | if (v == SEQ_START_TOKEN) | |
1779 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1780 | ||
1781 | if (mfc->next) | |
1782 | return mfc->next; | |
e905a9ed YH |
1783 | |
1784 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1785 | goto end_of_list; |
1786 | ||
1787 | BUG_ON(it->cache != mfc_cache_array); | |
1788 | ||
1789 | while (++it->ct < MFC_LINES) { | |
1790 | mfc = mfc_cache_array[it->ct]; | |
1791 | if (mfc) | |
1792 | return mfc; | |
1793 | } | |
1794 | ||
1795 | /* exhausted cache_array, show unresolved */ | |
1796 | read_unlock(&mrt_lock); | |
1797 | it->cache = &mfc_unres_queue; | |
1798 | it->ct = 0; | |
e905a9ed | 1799 | |
1da177e4 LT |
1800 | spin_lock_bh(&mfc_unres_lock); |
1801 | mfc = mfc_unres_queue; | |
e905a9ed | 1802 | if (mfc) |
1da177e4 LT |
1803 | return mfc; |
1804 | ||
1805 | end_of_list: | |
1806 | spin_unlock_bh(&mfc_unres_lock); | |
1807 | it->cache = NULL; | |
1808 | ||
1809 | return NULL; | |
1810 | } | |
1811 | ||
1812 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1813 | { | |
1814 | struct ipmr_mfc_iter *it = seq->private; | |
1815 | ||
1816 | if (it->cache == &mfc_unres_queue) | |
1817 | spin_unlock_bh(&mfc_unres_lock); | |
1818 | else if (it->cache == mfc_cache_array) | |
1819 | read_unlock(&mrt_lock); | |
1820 | } | |
1821 | ||
1822 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1823 | { | |
1824 | int n; | |
1825 | ||
1826 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1827 | seq_puts(seq, |
1da177e4 LT |
1828 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1829 | } else { | |
1830 | const struct mfc_cache *mfc = v; | |
1831 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1832 | |
1da177e4 LT |
1833 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", |
1834 | (unsigned long) mfc->mfc_mcastgrp, | |
1835 | (unsigned long) mfc->mfc_origin, | |
1836 | mfc->mfc_parent, | |
1837 | mfc->mfc_un.res.pkt, | |
1838 | mfc->mfc_un.res.bytes, | |
1839 | mfc->mfc_un.res.wrong_if); | |
1840 | ||
1841 | if (it->cache != &mfc_unres_queue) { | |
132adf54 SH |
1842 | for (n = mfc->mfc_un.res.minvif; |
1843 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1844 | if (VIF_EXISTS(n) | |
1da177e4 | 1845 | && mfc->mfc_un.res.ttls[n] < 255) |
e905a9ed YH |
1846 | seq_printf(seq, |
1847 | " %2d:%-3d", | |
1da177e4 LT |
1848 | n, mfc->mfc_un.res.ttls[n]); |
1849 | } | |
1850 | } | |
1851 | seq_putc(seq, '\n'); | |
1852 | } | |
1853 | return 0; | |
1854 | } | |
1855 | ||
f690808e | 1856 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1857 | .start = ipmr_mfc_seq_start, |
1858 | .next = ipmr_mfc_seq_next, | |
1859 | .stop = ipmr_mfc_seq_stop, | |
1860 | .show = ipmr_mfc_seq_show, | |
1861 | }; | |
1862 | ||
1863 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1864 | { | |
1865 | struct seq_file *seq; | |
1866 | int rc = -ENOMEM; | |
1867 | struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e905a9ed | 1868 | |
1da177e4 LT |
1869 | if (!s) |
1870 | goto out; | |
1871 | ||
1872 | rc = seq_open(file, &ipmr_mfc_seq_ops); | |
1873 | if (rc) | |
1874 | goto out_kfree; | |
1875 | ||
1876 | seq = file->private_data; | |
1877 | seq->private = s; | |
1878 | out: | |
1879 | return rc; | |
1880 | out_kfree: | |
1881 | kfree(s); | |
1882 | goto out; | |
1883 | ||
1884 | } | |
1885 | ||
9a32144e | 1886 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1887 | .owner = THIS_MODULE, |
1888 | .open = ipmr_mfc_open, | |
1889 | .read = seq_read, | |
1890 | .llseek = seq_lseek, | |
1891 | .release = seq_release_private, | |
1892 | }; | |
e905a9ed | 1893 | #endif |
1da177e4 LT |
1894 | |
1895 | #ifdef CONFIG_IP_PIMSM_V2 | |
1896 | static struct net_protocol pim_protocol = { | |
1897 | .handler = pim_rcv, | |
1898 | }; | |
1899 | #endif | |
1900 | ||
1901 | ||
1902 | /* | |
1903 | * Setup for IP multicast routing | |
1904 | */ | |
e905a9ed | 1905 | |
1da177e4 LT |
1906 | void __init ip_mr_init(void) |
1907 | { | |
1908 | mrt_cachep = kmem_cache_create("ip_mrt_cache", | |
1909 | sizeof(struct mfc_cache), | |
e5d679f3 | 1910 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 1911 | NULL, NULL); |
1da177e4 LT |
1912 | init_timer(&ipmr_expire_timer); |
1913 | ipmr_expire_timer.function=ipmr_expire_process; | |
1914 | register_netdevice_notifier(&ip_mr_notifier); | |
e905a9ed | 1915 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1916 | proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops); |
1917 | proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops); | |
e905a9ed | 1918 | #endif |
1da177e4 | 1919 | } |