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 | ||
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> | |
dc5fc579 | 65 | #include <net/netlink.h> |
1da177e4 LT |
66 | |
67 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
68 | #define CONFIG_IP_PIMSM 1 | |
69 | #endif | |
70 | ||
71 | static struct sock *mroute_socket; | |
72 | ||
73 | ||
74 | /* Big lock, protecting vif table, mrt cache and mroute socket state. | |
75 | Note that the changes are semaphored via rtnl_lock. | |
76 | */ | |
77 | ||
78 | static DEFINE_RWLOCK(mrt_lock); | |
79 | ||
80 | /* | |
81 | * Multicast router control variables | |
82 | */ | |
83 | ||
84 | static struct vif_device vif_table[MAXVIFS]; /* Devices */ | |
85 | static int maxvif; | |
86 | ||
87 | #define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) | |
88 | ||
89 | static int mroute_do_assert; /* Set in PIM assert */ | |
90 | static int mroute_do_pim; | |
91 | ||
92 | static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ | |
93 | ||
94 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ | |
95 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ | |
96 | ||
97 | /* Special spinlock for queue of unresolved entries */ | |
98 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
99 | ||
100 | /* We return to original Alan's scheme. Hash table of resolved | |
101 | entries is changed only in process context and protected | |
102 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
103 | with strong spinlock mfc_unres_lock. | |
104 | ||
105 | In this case data path is free of exclusive locks at all. | |
106 | */ | |
107 | ||
e18b890b | 108 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
109 | |
110 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
111 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
112 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
113 | ||
114 | #ifdef CONFIG_IP_PIMSM_V2 | |
115 | static struct net_protocol pim_protocol; | |
116 | #endif | |
117 | ||
118 | static struct timer_list ipmr_expire_timer; | |
119 | ||
120 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
121 | ||
122 | static | |
123 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
124 | { | |
125 | struct net_device *dev; | |
126 | ||
127 | dev = __dev_get_by_name("tunl0"); | |
128 | ||
129 | if (dev) { | |
130 | int err; | |
131 | struct ifreq ifr; | |
132 | mm_segment_t oldfs; | |
133 | struct ip_tunnel_parm p; | |
134 | struct in_device *in_dev; | |
135 | ||
136 | memset(&p, 0, sizeof(p)); | |
137 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
138 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
139 | p.iph.version = 4; | |
140 | p.iph.ihl = 5; | |
141 | p.iph.protocol = IPPROTO_IPIP; | |
142 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
143 | ifr.ifr_ifru.ifru_data = (void*)&p; | |
144 | ||
145 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
146 | err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
147 | set_fs(oldfs); | |
148 | ||
149 | dev = NULL; | |
150 | ||
151 | if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) { | |
152 | dev->flags |= IFF_MULTICAST; | |
153 | ||
e5ed6399 | 154 | in_dev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
155 | if (in_dev == NULL && (in_dev = inetdev_init(dev)) == NULL) |
156 | goto failure; | |
157 | in_dev->cnf.rp_filter = 0; | |
158 | ||
159 | if (dev_open(dev)) | |
160 | goto failure; | |
161 | } | |
162 | } | |
163 | return dev; | |
164 | ||
165 | failure: | |
166 | /* allow the register to be completed before unregistering. */ | |
167 | rtnl_unlock(); | |
168 | rtnl_lock(); | |
169 | ||
170 | unregister_netdevice(dev); | |
171 | return NULL; | |
172 | } | |
173 | ||
174 | #ifdef CONFIG_IP_PIMSM | |
175 | ||
176 | static int reg_vif_num = -1; | |
177 | ||
178 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
179 | { | |
180 | read_lock(&mrt_lock); | |
2941a486 PM |
181 | ((struct net_device_stats*)netdev_priv(dev))->tx_bytes += skb->len; |
182 | ((struct net_device_stats*)netdev_priv(dev))->tx_packets++; | |
1da177e4 LT |
183 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); |
184 | read_unlock(&mrt_lock); | |
185 | kfree_skb(skb); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static struct net_device_stats *reg_vif_get_stats(struct net_device *dev) | |
190 | { | |
2941a486 | 191 | return (struct net_device_stats*)netdev_priv(dev); |
1da177e4 LT |
192 | } |
193 | ||
194 | static void reg_vif_setup(struct net_device *dev) | |
195 | { | |
196 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 197 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 LT |
198 | dev->flags = IFF_NOARP; |
199 | dev->hard_start_xmit = reg_vif_xmit; | |
200 | dev->get_stats = reg_vif_get_stats; | |
201 | dev->destructor = free_netdev; | |
202 | } | |
203 | ||
204 | static struct net_device *ipmr_reg_vif(void) | |
205 | { | |
206 | struct net_device *dev; | |
207 | struct in_device *in_dev; | |
208 | ||
209 | dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg", | |
210 | reg_vif_setup); | |
211 | ||
212 | if (dev == NULL) | |
213 | return NULL; | |
214 | ||
215 | if (register_netdevice(dev)) { | |
216 | free_netdev(dev); | |
217 | return NULL; | |
218 | } | |
219 | dev->iflink = 0; | |
220 | ||
221 | if ((in_dev = inetdev_init(dev)) == NULL) | |
222 | goto failure; | |
223 | ||
224 | in_dev->cnf.rp_filter = 0; | |
225 | ||
226 | if (dev_open(dev)) | |
227 | goto failure; | |
228 | ||
229 | return dev; | |
230 | ||
231 | failure: | |
232 | /* allow the register to be completed before unregistering. */ | |
233 | rtnl_unlock(); | |
234 | rtnl_lock(); | |
235 | ||
236 | unregister_netdevice(dev); | |
237 | return NULL; | |
238 | } | |
239 | #endif | |
240 | ||
241 | /* | |
242 | * Delete a VIF entry | |
243 | */ | |
e905a9ed | 244 | |
1da177e4 LT |
245 | static int vif_delete(int vifi) |
246 | { | |
247 | struct vif_device *v; | |
248 | struct net_device *dev; | |
249 | struct in_device *in_dev; | |
250 | ||
251 | if (vifi < 0 || vifi >= maxvif) | |
252 | return -EADDRNOTAVAIL; | |
253 | ||
254 | v = &vif_table[vifi]; | |
255 | ||
256 | write_lock_bh(&mrt_lock); | |
257 | dev = v->dev; | |
258 | v->dev = NULL; | |
259 | ||
260 | if (!dev) { | |
261 | write_unlock_bh(&mrt_lock); | |
262 | return -EADDRNOTAVAIL; | |
263 | } | |
264 | ||
265 | #ifdef CONFIG_IP_PIMSM | |
266 | if (vifi == reg_vif_num) | |
267 | reg_vif_num = -1; | |
268 | #endif | |
269 | ||
270 | if (vifi+1 == maxvif) { | |
271 | int tmp; | |
272 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
273 | if (VIF_EXISTS(tmp)) | |
274 | break; | |
275 | } | |
276 | maxvif = tmp+1; | |
277 | } | |
278 | ||
279 | write_unlock_bh(&mrt_lock); | |
280 | ||
281 | dev_set_allmulti(dev, -1); | |
282 | ||
e5ed6399 | 283 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
1da177e4 LT |
284 | in_dev->cnf.mc_forwarding--; |
285 | ip_rt_multicast_event(in_dev); | |
286 | } | |
287 | ||
288 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
289 | unregister_netdevice(dev); | |
290 | ||
291 | dev_put(dev); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | /* Destroy an unresolved cache entry, killing queued skbs | |
296 | and reporting error to netlink readers. | |
297 | */ | |
298 | ||
299 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
300 | { | |
301 | struct sk_buff *skb; | |
9ef1d4c7 | 302 | struct nlmsgerr *e; |
1da177e4 LT |
303 | |
304 | atomic_dec(&cache_resolve_queue_len); | |
305 | ||
132adf54 | 306 | while ((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 307 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
308 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
309 | nlh->nlmsg_type = NLMSG_ERROR; | |
310 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
311 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
312 | e = NLMSG_DATA(nlh); |
313 | e->error = -ETIMEDOUT; | |
314 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 TG |
315 | |
316 | rtnl_unicast(skb, NETLINK_CB(skb).pid); | |
1da177e4 LT |
317 | } else |
318 | kfree_skb(skb); | |
319 | } | |
320 | ||
321 | kmem_cache_free(mrt_cachep, c); | |
322 | } | |
323 | ||
324 | ||
325 | /* Single timer process for all the unresolved queue. */ | |
326 | ||
327 | static void ipmr_expire_process(unsigned long dummy) | |
328 | { | |
329 | unsigned long now; | |
330 | unsigned long expires; | |
331 | struct mfc_cache *c, **cp; | |
332 | ||
333 | if (!spin_trylock(&mfc_unres_lock)) { | |
334 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
335 | return; | |
336 | } | |
337 | ||
338 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
339 | goto out; | |
340 | ||
341 | now = jiffies; | |
342 | expires = 10*HZ; | |
343 | cp = &mfc_unres_queue; | |
344 | ||
345 | while ((c=*cp) != NULL) { | |
346 | if (time_after(c->mfc_un.unres.expires, now)) { | |
347 | unsigned long interval = c->mfc_un.unres.expires - now; | |
348 | if (interval < expires) | |
349 | expires = interval; | |
350 | cp = &c->next; | |
351 | continue; | |
352 | } | |
353 | ||
354 | *cp = c->next; | |
355 | ||
356 | ipmr_destroy_unres(c); | |
357 | } | |
358 | ||
359 | if (atomic_read(&cache_resolve_queue_len)) | |
360 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
361 | ||
362 | out: | |
363 | spin_unlock(&mfc_unres_lock); | |
364 | } | |
365 | ||
366 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
367 | ||
d1b04c08 | 368 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
369 | { |
370 | int vifi; | |
371 | ||
372 | cache->mfc_un.res.minvif = MAXVIFS; | |
373 | cache->mfc_un.res.maxvif = 0; | |
374 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
375 | ||
376 | for (vifi=0; vifi<maxvif; vifi++) { | |
377 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
378 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
379 | if (cache->mfc_un.res.minvif > vifi) | |
380 | cache->mfc_un.res.minvif = vifi; | |
381 | if (cache->mfc_un.res.maxvif <= vifi) | |
382 | cache->mfc_un.res.maxvif = vifi + 1; | |
383 | } | |
384 | } | |
385 | } | |
386 | ||
387 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
388 | { | |
389 | int vifi = vifc->vifc_vifi; | |
390 | struct vif_device *v = &vif_table[vifi]; | |
391 | struct net_device *dev; | |
392 | struct in_device *in_dev; | |
393 | ||
394 | /* Is vif busy ? */ | |
395 | if (VIF_EXISTS(vifi)) | |
396 | return -EADDRINUSE; | |
397 | ||
398 | switch (vifc->vifc_flags) { | |
399 | #ifdef CONFIG_IP_PIMSM | |
400 | case VIFF_REGISTER: | |
401 | /* | |
402 | * Special Purpose VIF in PIM | |
403 | * All the packets will be sent to the daemon | |
404 | */ | |
405 | if (reg_vif_num >= 0) | |
406 | return -EADDRINUSE; | |
407 | dev = ipmr_reg_vif(); | |
408 | if (!dev) | |
409 | return -ENOBUFS; | |
410 | break; | |
411 | #endif | |
e905a9ed | 412 | case VIFF_TUNNEL: |
1da177e4 LT |
413 | dev = ipmr_new_tunnel(vifc); |
414 | if (!dev) | |
415 | return -ENOBUFS; | |
416 | break; | |
417 | case 0: | |
15333061 | 418 | dev = ip_dev_find(vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
419 | if (!dev) |
420 | return -EADDRNOTAVAIL; | |
15333061 | 421 | dev_put(dev); |
1da177e4 LT |
422 | break; |
423 | default: | |
424 | return -EINVAL; | |
425 | } | |
426 | ||
e5ed6399 | 427 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 LT |
428 | return -EADDRNOTAVAIL; |
429 | in_dev->cnf.mc_forwarding++; | |
430 | dev_set_allmulti(dev, +1); | |
431 | ip_rt_multicast_event(in_dev); | |
432 | ||
433 | /* | |
434 | * Fill in the VIF structures | |
435 | */ | |
436 | v->rate_limit=vifc->vifc_rate_limit; | |
437 | v->local=vifc->vifc_lcl_addr.s_addr; | |
438 | v->remote=vifc->vifc_rmt_addr.s_addr; | |
439 | v->flags=vifc->vifc_flags; | |
440 | if (!mrtsock) | |
441 | v->flags |= VIFF_STATIC; | |
442 | v->threshold=vifc->vifc_threshold; | |
443 | v->bytes_in = 0; | |
444 | v->bytes_out = 0; | |
445 | v->pkt_in = 0; | |
446 | v->pkt_out = 0; | |
447 | v->link = dev->ifindex; | |
448 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
449 | v->link = dev->iflink; | |
450 | ||
451 | /* And finish update writing critical data */ | |
452 | write_lock_bh(&mrt_lock); | |
453 | dev_hold(dev); | |
454 | v->dev=dev; | |
455 | #ifdef CONFIG_IP_PIMSM | |
456 | if (v->flags&VIFF_REGISTER) | |
457 | reg_vif_num = vifi; | |
458 | #endif | |
459 | if (vifi+1 > maxvif) | |
460 | maxvif = vifi+1; | |
461 | write_unlock_bh(&mrt_lock); | |
462 | return 0; | |
463 | } | |
464 | ||
114c7844 | 465 | static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp) |
1da177e4 LT |
466 | { |
467 | int line=MFC_HASH(mcastgrp,origin); | |
468 | struct mfc_cache *c; | |
469 | ||
470 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
471 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
472 | break; | |
473 | } | |
474 | return c; | |
475 | } | |
476 | ||
477 | /* | |
478 | * Allocate a multicast cache entry | |
479 | */ | |
480 | static struct mfc_cache *ipmr_cache_alloc(void) | |
481 | { | |
c3762229 | 482 | struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
132adf54 | 483 | if (c==NULL) |
1da177e4 | 484 | return NULL; |
1da177e4 LT |
485 | c->mfc_un.res.minvif = MAXVIFS; |
486 | return c; | |
487 | } | |
488 | ||
489 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
490 | { | |
c3762229 | 491 | struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
132adf54 | 492 | if (c==NULL) |
1da177e4 | 493 | return NULL; |
1da177e4 LT |
494 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
495 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
496 | return c; | |
497 | } | |
498 | ||
499 | /* | |
500 | * A cache entry has gone into a resolved state from queued | |
501 | */ | |
e905a9ed | 502 | |
1da177e4 LT |
503 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
504 | { | |
505 | struct sk_buff *skb; | |
9ef1d4c7 | 506 | struct nlmsgerr *e; |
1da177e4 LT |
507 | |
508 | /* | |
509 | * Play the pending entries through our router | |
510 | */ | |
511 | ||
132adf54 | 512 | while ((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 513 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
514 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
515 | ||
516 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
517 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
518 | (u8 *)nlh); | |
1da177e4 LT |
519 | } else { |
520 | nlh->nlmsg_type = NLMSG_ERROR; | |
521 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
522 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
523 | e = NLMSG_DATA(nlh); |
524 | e->error = -EMSGSIZE; | |
525 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 526 | } |
2942e900 TG |
527 | |
528 | rtnl_unicast(skb, NETLINK_CB(skb).pid); | |
1da177e4 LT |
529 | } else |
530 | ip_mr_forward(skb, c, 0); | |
531 | } | |
532 | } | |
533 | ||
534 | /* | |
535 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
536 | * expects the following bizarre scheme. | |
537 | * | |
538 | * Called under mrt_lock. | |
539 | */ | |
e905a9ed | 540 | |
1da177e4 LT |
541 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
542 | { | |
543 | struct sk_buff *skb; | |
c9bdd4b5 | 544 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
545 | struct igmphdr *igmp; |
546 | struct igmpmsg *msg; | |
547 | int ret; | |
548 | ||
549 | #ifdef CONFIG_IP_PIMSM | |
550 | if (assert == IGMPMSG_WHOLEPKT) | |
551 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
552 | else | |
553 | #endif | |
554 | skb = alloc_skb(128, GFP_ATOMIC); | |
555 | ||
132adf54 | 556 | if (!skb) |
1da177e4 LT |
557 | return -ENOBUFS; |
558 | ||
559 | #ifdef CONFIG_IP_PIMSM | |
560 | if (assert == IGMPMSG_WHOLEPKT) { | |
561 | /* Ugly, but we have no choice with this interface. | |
562 | Duplicate old header, fix ihl, length etc. | |
563 | And all this only to mangle msg->im_msgtype and | |
564 | to set msg->im_mbz to "mbz" :-) | |
565 | */ | |
878c8145 ACM |
566 | skb_push(skb, sizeof(struct iphdr)); |
567 | skb_reset_network_header(skb); | |
badff6d0 | 568 | skb_reset_transport_header(skb); |
0272ffc4 | 569 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 570 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
571 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
572 | msg->im_mbz = 0; | |
e905a9ed | 573 | msg->im_vif = reg_vif_num; |
eddc9ec5 ACM |
574 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
575 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
576 | sizeof(struct iphdr)); | |
e905a9ed | 577 | } else |
1da177e4 | 578 | #endif |
e905a9ed YH |
579 | { |
580 | ||
1da177e4 LT |
581 | /* |
582 | * Copy the IP header | |
583 | */ | |
584 | ||
27a884dc | 585 | skb->network_header = skb->tail; |
ddc7b8e3 | 586 | skb_put(skb, ihl); |
1da177e4 | 587 | memcpy(skb->data,pkt->data,ihl); |
eddc9ec5 ACM |
588 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
589 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
590 | msg->im_vif = vifi; |
591 | skb->dst = dst_clone(pkt->dst); | |
592 | ||
593 | /* | |
594 | * Add our header | |
595 | */ | |
596 | ||
597 | igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); | |
598 | igmp->type = | |
599 | msg->im_msgtype = assert; | |
600 | igmp->code = 0; | |
eddc9ec5 | 601 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 602 | skb->transport_header = skb->network_header; |
e905a9ed | 603 | } |
1da177e4 LT |
604 | |
605 | if (mroute_socket == NULL) { | |
606 | kfree_skb(skb); | |
607 | return -EINVAL; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Deliver to mrouted | |
612 | */ | |
613 | if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { | |
614 | if (net_ratelimit()) | |
615 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
616 | kfree_skb(skb); | |
617 | } | |
618 | ||
619 | return ret; | |
620 | } | |
621 | ||
622 | /* | |
623 | * Queue a packet for resolution. It gets locked cache entry! | |
624 | */ | |
e905a9ed | 625 | |
1da177e4 LT |
626 | static int |
627 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
628 | { | |
629 | int err; | |
630 | struct mfc_cache *c; | |
eddc9ec5 | 631 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
632 | |
633 | spin_lock_bh(&mfc_unres_lock); | |
634 | for (c=mfc_unres_queue; c; c=c->next) { | |
eddc9ec5 ACM |
635 | if (c->mfc_mcastgrp == iph->daddr && |
636 | c->mfc_origin == iph->saddr) | |
1da177e4 LT |
637 | break; |
638 | } | |
639 | ||
640 | if (c == NULL) { | |
641 | /* | |
642 | * Create a new entry if allowable | |
643 | */ | |
644 | ||
645 | if (atomic_read(&cache_resolve_queue_len)>=10 || | |
646 | (c=ipmr_cache_alloc_unres())==NULL) { | |
647 | spin_unlock_bh(&mfc_unres_lock); | |
648 | ||
649 | kfree_skb(skb); | |
650 | return -ENOBUFS; | |
651 | } | |
652 | ||
653 | /* | |
654 | * Fill in the new cache entry | |
655 | */ | |
eddc9ec5 ACM |
656 | c->mfc_parent = -1; |
657 | c->mfc_origin = iph->saddr; | |
658 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
659 | |
660 | /* | |
661 | * Reflect first query at mrouted. | |
662 | */ | |
663 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
e905a9ed | 664 | /* If the report failed throw the cache entry |
1da177e4 LT |
665 | out - Brad Parker |
666 | */ | |
667 | spin_unlock_bh(&mfc_unres_lock); | |
668 | ||
669 | kmem_cache_free(mrt_cachep, c); | |
670 | kfree_skb(skb); | |
671 | return err; | |
672 | } | |
673 | ||
674 | atomic_inc(&cache_resolve_queue_len); | |
675 | c->next = mfc_unres_queue; | |
676 | mfc_unres_queue = c; | |
677 | ||
678 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
679 | } | |
680 | ||
681 | /* | |
682 | * See if we can append the packet | |
683 | */ | |
684 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
685 | kfree_skb(skb); | |
686 | err = -ENOBUFS; | |
687 | } else { | |
688 | skb_queue_tail(&c->mfc_un.unres.unresolved,skb); | |
689 | err = 0; | |
690 | } | |
691 | ||
692 | spin_unlock_bh(&mfc_unres_lock); | |
693 | return err; | |
694 | } | |
695 | ||
696 | /* | |
697 | * MFC cache manipulation by user space mroute daemon | |
698 | */ | |
699 | ||
700 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
701 | { | |
702 | int line; | |
703 | struct mfc_cache *c, **cp; | |
704 | ||
705 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
706 | ||
707 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
708 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
709 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
710 | write_lock_bh(&mrt_lock); | |
711 | *cp = c->next; | |
712 | write_unlock_bh(&mrt_lock); | |
713 | ||
714 | kmem_cache_free(mrt_cachep, c); | |
715 | return 0; | |
716 | } | |
717 | } | |
718 | return -ENOENT; | |
719 | } | |
720 | ||
721 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
722 | { | |
723 | int line; | |
724 | struct mfc_cache *uc, *c, **cp; | |
725 | ||
726 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
727 | ||
728 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
729 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
730 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
731 | break; | |
732 | } | |
733 | ||
734 | if (c != NULL) { | |
735 | write_lock_bh(&mrt_lock); | |
736 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 737 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
738 | if (!mrtsock) |
739 | c->mfc_flags |= MFC_STATIC; | |
740 | write_unlock_bh(&mrt_lock); | |
741 | return 0; | |
742 | } | |
743 | ||
132adf54 | 744 | if (!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
745 | return -EINVAL; |
746 | ||
747 | c=ipmr_cache_alloc(); | |
748 | if (c==NULL) | |
749 | return -ENOMEM; | |
750 | ||
751 | c->mfc_origin=mfc->mfcc_origin.s_addr; | |
752 | c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; | |
753 | c->mfc_parent=mfc->mfcc_parent; | |
d1b04c08 | 754 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
755 | if (!mrtsock) |
756 | c->mfc_flags |= MFC_STATIC; | |
757 | ||
758 | write_lock_bh(&mrt_lock); | |
759 | c->next = mfc_cache_array[line]; | |
760 | mfc_cache_array[line] = c; | |
761 | write_unlock_bh(&mrt_lock); | |
762 | ||
763 | /* | |
764 | * Check to see if we resolved a queued list. If so we | |
765 | * need to send on the frames and tidy up. | |
766 | */ | |
767 | spin_lock_bh(&mfc_unres_lock); | |
768 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
769 | cp = &uc->next) { | |
770 | if (uc->mfc_origin == c->mfc_origin && | |
771 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
772 | *cp = uc->next; | |
773 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
774 | del_timer(&ipmr_expire_timer); | |
775 | break; | |
776 | } | |
777 | } | |
778 | spin_unlock_bh(&mfc_unres_lock); | |
779 | ||
780 | if (uc) { | |
781 | ipmr_cache_resolve(uc, c); | |
782 | kmem_cache_free(mrt_cachep, uc); | |
783 | } | |
784 | return 0; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Close the multicast socket, and clear the vif tables etc | |
789 | */ | |
e905a9ed | 790 | |
1da177e4 LT |
791 | static void mroute_clean_tables(struct sock *sk) |
792 | { | |
793 | int i; | |
e905a9ed | 794 | |
1da177e4 LT |
795 | /* |
796 | * Shut down all active vif entries | |
797 | */ | |
132adf54 | 798 | for (i=0; i<maxvif; i++) { |
1da177e4 LT |
799 | if (!(vif_table[i].flags&VIFF_STATIC)) |
800 | vif_delete(i); | |
801 | } | |
802 | ||
803 | /* | |
804 | * Wipe the cache | |
805 | */ | |
806 | for (i=0;i<MFC_LINES;i++) { | |
807 | struct mfc_cache *c, **cp; | |
808 | ||
809 | cp = &mfc_cache_array[i]; | |
810 | while ((c = *cp) != NULL) { | |
811 | if (c->mfc_flags&MFC_STATIC) { | |
812 | cp = &c->next; | |
813 | continue; | |
814 | } | |
815 | write_lock_bh(&mrt_lock); | |
816 | *cp = c->next; | |
817 | write_unlock_bh(&mrt_lock); | |
818 | ||
819 | kmem_cache_free(mrt_cachep, c); | |
820 | } | |
821 | } | |
822 | ||
823 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
824 | struct mfc_cache *c; | |
825 | ||
826 | spin_lock_bh(&mfc_unres_lock); | |
827 | while (mfc_unres_queue != NULL) { | |
828 | c = mfc_unres_queue; | |
829 | mfc_unres_queue = c->next; | |
830 | spin_unlock_bh(&mfc_unres_lock); | |
831 | ||
832 | ipmr_destroy_unres(c); | |
833 | ||
834 | spin_lock_bh(&mfc_unres_lock); | |
835 | } | |
836 | spin_unlock_bh(&mfc_unres_lock); | |
837 | } | |
838 | } | |
839 | ||
840 | static void mrtsock_destruct(struct sock *sk) | |
841 | { | |
842 | rtnl_lock(); | |
843 | if (sk == mroute_socket) { | |
844 | ipv4_devconf.mc_forwarding--; | |
845 | ||
846 | write_lock_bh(&mrt_lock); | |
847 | mroute_socket=NULL; | |
848 | write_unlock_bh(&mrt_lock); | |
849 | ||
850 | mroute_clean_tables(sk); | |
851 | } | |
852 | rtnl_unlock(); | |
853 | } | |
854 | ||
855 | /* | |
856 | * Socket options and virtual interface manipulation. The whole | |
857 | * virtual interface system is a complete heap, but unfortunately | |
858 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
859 | * MOSPF/PIM router set up we can clean this up. | |
860 | */ | |
e905a9ed | 861 | |
1da177e4 LT |
862 | int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) |
863 | { | |
864 | int ret; | |
865 | struct vifctl vif; | |
866 | struct mfcctl mfc; | |
e905a9ed | 867 | |
132adf54 SH |
868 | if (optname != MRT_INIT) { |
869 | if (sk != mroute_socket && !capable(CAP_NET_ADMIN)) | |
1da177e4 LT |
870 | return -EACCES; |
871 | } | |
872 | ||
132adf54 SH |
873 | switch (optname) { |
874 | case MRT_INIT: | |
875 | if (sk->sk_type != SOCK_RAW || | |
876 | inet_sk(sk)->num != IPPROTO_IGMP) | |
877 | return -EOPNOTSUPP; | |
878 | if (optlen!=sizeof(int)) | |
879 | return -ENOPROTOOPT; | |
1da177e4 | 880 | |
132adf54 SH |
881 | rtnl_lock(); |
882 | if (mroute_socket) { | |
1da177e4 | 883 | rtnl_unlock(); |
132adf54 SH |
884 | return -EADDRINUSE; |
885 | } | |
886 | ||
887 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
888 | if (ret == 0) { | |
889 | write_lock_bh(&mrt_lock); | |
890 | mroute_socket=sk; | |
891 | write_unlock_bh(&mrt_lock); | |
892 | ||
893 | ipv4_devconf.mc_forwarding++; | |
894 | } | |
895 | rtnl_unlock(); | |
896 | return ret; | |
897 | case MRT_DONE: | |
898 | if (sk!=mroute_socket) | |
899 | return -EACCES; | |
900 | return ip_ra_control(sk, 0, NULL); | |
901 | case MRT_ADD_VIF: | |
902 | case MRT_DEL_VIF: | |
903 | if (optlen!=sizeof(vif)) | |
904 | return -EINVAL; | |
905 | if (copy_from_user(&vif,optval,sizeof(vif))) | |
906 | return -EFAULT; | |
907 | if (vif.vifc_vifi >= MAXVIFS) | |
908 | return -ENFILE; | |
909 | rtnl_lock(); | |
910 | if (optname==MRT_ADD_VIF) { | |
911 | ret = vif_add(&vif, sk==mroute_socket); | |
912 | } else { | |
913 | ret = vif_delete(vif.vifc_vifi); | |
914 | } | |
915 | rtnl_unlock(); | |
916 | return ret; | |
1da177e4 LT |
917 | |
918 | /* | |
919 | * Manipulate the forwarding caches. These live | |
920 | * in a sort of kernel/user symbiosis. | |
921 | */ | |
132adf54 SH |
922 | case MRT_ADD_MFC: |
923 | case MRT_DEL_MFC: | |
924 | if (optlen!=sizeof(mfc)) | |
925 | return -EINVAL; | |
926 | if (copy_from_user(&mfc,optval, sizeof(mfc))) | |
927 | return -EFAULT; | |
928 | rtnl_lock(); | |
929 | if (optname==MRT_DEL_MFC) | |
930 | ret = ipmr_mfc_delete(&mfc); | |
931 | else | |
932 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); | |
933 | rtnl_unlock(); | |
934 | return ret; | |
1da177e4 LT |
935 | /* |
936 | * Control PIM assert. | |
937 | */ | |
132adf54 SH |
938 | case MRT_ASSERT: |
939 | { | |
940 | int v; | |
941 | if (get_user(v,(int __user *)optval)) | |
942 | return -EFAULT; | |
943 | mroute_do_assert=(v)?1:0; | |
944 | return 0; | |
945 | } | |
1da177e4 | 946 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
947 | case MRT_PIM: |
948 | { | |
949 | int v, ret; | |
950 | if (get_user(v,(int __user *)optval)) | |
951 | return -EFAULT; | |
952 | v = (v)?1:0; | |
953 | rtnl_lock(); | |
954 | ret = 0; | |
955 | if (v != mroute_do_pim) { | |
956 | mroute_do_pim = v; | |
957 | mroute_do_assert = v; | |
1da177e4 | 958 | #ifdef CONFIG_IP_PIMSM_V2 |
132adf54 SH |
959 | if (mroute_do_pim) |
960 | ret = inet_add_protocol(&pim_protocol, | |
961 | IPPROTO_PIM); | |
962 | else | |
963 | ret = inet_del_protocol(&pim_protocol, | |
964 | IPPROTO_PIM); | |
965 | if (ret < 0) | |
966 | ret = -EAGAIN; | |
1da177e4 | 967 | #endif |
1da177e4 | 968 | } |
132adf54 SH |
969 | rtnl_unlock(); |
970 | return ret; | |
971 | } | |
1da177e4 | 972 | #endif |
132adf54 SH |
973 | /* |
974 | * Spurious command, or MRT_VERSION which you cannot | |
975 | * set. | |
976 | */ | |
977 | default: | |
978 | return -ENOPROTOOPT; | |
1da177e4 LT |
979 | } |
980 | } | |
981 | ||
982 | /* | |
983 | * Getsock opt support for the multicast routing system. | |
984 | */ | |
e905a9ed | 985 | |
1da177e4 LT |
986 | int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) |
987 | { | |
988 | int olr; | |
989 | int val; | |
990 | ||
132adf54 | 991 | if (optname!=MRT_VERSION && |
1da177e4 LT |
992 | #ifdef CONFIG_IP_PIMSM |
993 | optname!=MRT_PIM && | |
994 | #endif | |
995 | optname!=MRT_ASSERT) | |
996 | return -ENOPROTOOPT; | |
997 | ||
998 | if (get_user(olr, optlen)) | |
999 | return -EFAULT; | |
1000 | ||
1001 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1002 | if (olr < 0) | |
1003 | return -EINVAL; | |
e905a9ed | 1004 | |
132adf54 | 1005 | if (put_user(olr,optlen)) |
1da177e4 | 1006 | return -EFAULT; |
132adf54 | 1007 | if (optname==MRT_VERSION) |
1da177e4 LT |
1008 | val=0x0305; |
1009 | #ifdef CONFIG_IP_PIMSM | |
132adf54 | 1010 | else if (optname==MRT_PIM) |
1da177e4 LT |
1011 | val=mroute_do_pim; |
1012 | #endif | |
1013 | else | |
1014 | val=mroute_do_assert; | |
132adf54 | 1015 | if (copy_to_user(optval,&val,olr)) |
1da177e4 LT |
1016 | return -EFAULT; |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * The IP multicast ioctl support routines. | |
1022 | */ | |
e905a9ed | 1023 | |
1da177e4 LT |
1024 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1025 | { | |
1026 | struct sioc_sg_req sr; | |
1027 | struct sioc_vif_req vr; | |
1028 | struct vif_device *vif; | |
1029 | struct mfc_cache *c; | |
e905a9ed | 1030 | |
132adf54 SH |
1031 | switch (cmd) { |
1032 | case SIOCGETVIFCNT: | |
1033 | if (copy_from_user(&vr,arg,sizeof(vr))) | |
1034 | return -EFAULT; | |
1035 | if (vr.vifi>=maxvif) | |
1036 | return -EINVAL; | |
1037 | read_lock(&mrt_lock); | |
1038 | vif=&vif_table[vr.vifi]; | |
1039 | if (VIF_EXISTS(vr.vifi)) { | |
1040 | vr.icount=vif->pkt_in; | |
1041 | vr.ocount=vif->pkt_out; | |
1042 | vr.ibytes=vif->bytes_in; | |
1043 | vr.obytes=vif->bytes_out; | |
1da177e4 | 1044 | read_unlock(&mrt_lock); |
1da177e4 | 1045 | |
132adf54 SH |
1046 | if (copy_to_user(arg,&vr,sizeof(vr))) |
1047 | return -EFAULT; | |
1048 | return 0; | |
1049 | } | |
1050 | read_unlock(&mrt_lock); | |
1051 | return -EADDRNOTAVAIL; | |
1052 | case SIOCGETSGCNT: | |
1053 | if (copy_from_user(&sr,arg,sizeof(sr))) | |
1054 | return -EFAULT; | |
1055 | ||
1056 | read_lock(&mrt_lock); | |
1057 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1058 | if (c) { | |
1059 | sr.pktcnt = c->mfc_un.res.pkt; | |
1060 | sr.bytecnt = c->mfc_un.res.bytes; | |
1061 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1062 | read_unlock(&mrt_lock); |
132adf54 SH |
1063 | |
1064 | if (copy_to_user(arg,&sr,sizeof(sr))) | |
1065 | return -EFAULT; | |
1066 | return 0; | |
1067 | } | |
1068 | read_unlock(&mrt_lock); | |
1069 | return -EADDRNOTAVAIL; | |
1070 | default: | |
1071 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1072 | } |
1073 | } | |
1074 | ||
1075 | ||
1076 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1077 | { | |
1078 | struct vif_device *v; | |
1079 | int ct; | |
1080 | if (event != NETDEV_UNREGISTER) | |
1081 | return NOTIFY_DONE; | |
1082 | v=&vif_table[0]; | |
132adf54 | 1083 | for (ct=0;ct<maxvif;ct++,v++) { |
1da177e4 LT |
1084 | if (v->dev==ptr) |
1085 | vif_delete(ct); | |
1086 | } | |
1087 | return NOTIFY_DONE; | |
1088 | } | |
1089 | ||
1090 | ||
1091 | static struct notifier_block ip_mr_notifier={ | |
1092 | .notifier_call = ipmr_device_event, | |
1093 | }; | |
1094 | ||
1095 | /* | |
1096 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1097 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1098 | * important for multicast video. | |
1099 | */ | |
e905a9ed | 1100 | |
114c7844 | 1101 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1102 | { |
8856dfa3 | 1103 | struct iphdr *iph; |
eddc9ec5 | 1104 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1105 | |
1106 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1107 | skb->transport_header = skb->network_header; |
8856dfa3 | 1108 | skb_reset_network_header(skb); |
eddc9ec5 | 1109 | iph = ip_hdr(skb); |
1da177e4 LT |
1110 | |
1111 | iph->version = 4; | |
e023dd64 ACM |
1112 | iph->tos = old_iph->tos; |
1113 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1114 | iph->frag_off = 0; |
1115 | iph->daddr = daddr; | |
1116 | iph->saddr = saddr; | |
1117 | iph->protocol = IPPROTO_IPIP; | |
1118 | iph->ihl = 5; | |
1119 | iph->tot_len = htons(skb->len); | |
1120 | ip_select_ident(iph, skb->dst, NULL); | |
1121 | ip_send_check(iph); | |
1122 | ||
1da177e4 LT |
1123 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1124 | nf_reset(skb); | |
1125 | } | |
1126 | ||
1127 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1128 | { | |
1129 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1130 | ||
1131 | IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
1132 | ||
1133 | if (unlikely(opt->optlen)) | |
1134 | ip_forward_options(skb); | |
1135 | ||
1136 | return dst_output(skb); | |
1137 | } | |
1138 | ||
1139 | /* | |
1140 | * Processing handlers for ipmr_forward | |
1141 | */ | |
1142 | ||
1143 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1144 | { | |
eddc9ec5 | 1145 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1146 | struct vif_device *vif = &vif_table[vifi]; |
1147 | struct net_device *dev; | |
1148 | struct rtable *rt; | |
1149 | int encap = 0; | |
1150 | ||
1151 | if (vif->dev == NULL) | |
1152 | goto out_free; | |
1153 | ||
1154 | #ifdef CONFIG_IP_PIMSM | |
1155 | if (vif->flags & VIFF_REGISTER) { | |
1156 | vif->pkt_out++; | |
1157 | vif->bytes_out+=skb->len; | |
2941a486 PM |
1158 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_bytes += skb->len; |
1159 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_packets++; | |
1da177e4 LT |
1160 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
1161 | kfree_skb(skb); | |
1162 | return; | |
1163 | } | |
1164 | #endif | |
1165 | ||
1166 | if (vif->flags&VIFF_TUNNEL) { | |
1167 | struct flowi fl = { .oif = vif->link, | |
1168 | .nl_u = { .ip4_u = | |
1169 | { .daddr = vif->remote, | |
1170 | .saddr = vif->local, | |
1171 | .tos = RT_TOS(iph->tos) } }, | |
1172 | .proto = IPPROTO_IPIP }; | |
1173 | if (ip_route_output_key(&rt, &fl)) | |
1174 | goto out_free; | |
1175 | encap = sizeof(struct iphdr); | |
1176 | } else { | |
1177 | struct flowi fl = { .oif = vif->link, | |
1178 | .nl_u = { .ip4_u = | |
1179 | { .daddr = iph->daddr, | |
1180 | .tos = RT_TOS(iph->tos) } }, | |
1181 | .proto = IPPROTO_IPIP }; | |
1182 | if (ip_route_output_key(&rt, &fl)) | |
1183 | goto out_free; | |
1184 | } | |
1185 | ||
1186 | dev = rt->u.dst.dev; | |
1187 | ||
1188 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1189 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1190 | allow to send ICMP, so that packets will disappear | |
1191 | to blackhole. | |
1192 | */ | |
1193 | ||
1194 | IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
1195 | ip_rt_put(rt); | |
1196 | goto out_free; | |
1197 | } | |
1198 | ||
1199 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1200 | ||
1201 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1202 | ip_rt_put(rt); |
1da177e4 LT |
1203 | goto out_free; |
1204 | } | |
1205 | ||
1206 | vif->pkt_out++; | |
1207 | vif->bytes_out+=skb->len; | |
1208 | ||
1209 | dst_release(skb->dst); | |
1210 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1211 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1212 | |
1213 | /* FIXME: forward and output firewalls used to be called here. | |
1214 | * What do we do with netfilter? -- RR */ | |
1215 | if (vif->flags & VIFF_TUNNEL) { | |
1216 | ip_encap(skb, vif->local, vif->remote); | |
1217 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2941a486 PM |
1218 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_packets++; |
1219 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_bytes+=skb->len; | |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1223 | ||
1224 | /* | |
1225 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1226 | * not only before forwarding, but after forwarding on all output | |
1227 | * interfaces. It is clear, if mrouter runs a multicasting | |
1228 | * program, it should receive packets not depending to what interface | |
1229 | * program is joined. | |
1230 | * If we will not make it, the program will have to join on all | |
1231 | * interfaces. On the other hand, multihoming host (or router, but | |
1232 | * not mrouter) cannot join to more than one interface - it will | |
1233 | * result in receiving multiple packets. | |
1234 | */ | |
e905a9ed | 1235 | NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1236 | ipmr_forward_finish); |
1237 | return; | |
1238 | ||
1239 | out_free: | |
1240 | kfree_skb(skb); | |
1241 | return; | |
1242 | } | |
1243 | ||
1244 | static int ipmr_find_vif(struct net_device *dev) | |
1245 | { | |
1246 | int ct; | |
1247 | for (ct=maxvif-1; ct>=0; ct--) { | |
1248 | if (vif_table[ct].dev == dev) | |
1249 | break; | |
1250 | } | |
1251 | return ct; | |
1252 | } | |
1253 | ||
1254 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1255 | ||
1256 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1257 | { | |
1258 | int psend = -1; | |
1259 | int vif, ct; | |
1260 | ||
1261 | vif = cache->mfc_parent; | |
1262 | cache->mfc_un.res.pkt++; | |
1263 | cache->mfc_un.res.bytes += skb->len; | |
1264 | ||
1265 | /* | |
1266 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1267 | */ | |
1268 | if (vif_table[vif].dev != skb->dev) { | |
1269 | int true_vifi; | |
1270 | ||
1271 | if (((struct rtable*)skb->dst)->fl.iif == 0) { | |
1272 | /* It is our own packet, looped back. | |
1273 | Very complicated situation... | |
1274 | ||
1275 | The best workaround until routing daemons will be | |
1276 | fixed is not to redistribute packet, if it was | |
1277 | send through wrong interface. It means, that | |
1278 | multicast applications WILL NOT work for | |
1279 | (S,G), which have default multicast route pointing | |
1280 | to wrong oif. In any case, it is not a good | |
1281 | idea to use multicasting applications on router. | |
1282 | */ | |
1283 | goto dont_forward; | |
1284 | } | |
1285 | ||
1286 | cache->mfc_un.res.wrong_if++; | |
1287 | true_vifi = ipmr_find_vif(skb->dev); | |
1288 | ||
1289 | if (true_vifi >= 0 && mroute_do_assert && | |
1290 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1291 | so that we cannot check that packet arrived on an oif. | |
1292 | It is bad, but otherwise we would need to move pretty | |
1293 | large chunk of pimd to kernel. Ough... --ANK | |
1294 | */ | |
1295 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
e905a9ed | 1296 | time_after(jiffies, |
1da177e4 LT |
1297 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1298 | cache->mfc_un.res.last_assert = jiffies; | |
1299 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1300 | } | |
1301 | goto dont_forward; | |
1302 | } | |
1303 | ||
1304 | vif_table[vif].pkt_in++; | |
1305 | vif_table[vif].bytes_in+=skb->len; | |
1306 | ||
1307 | /* | |
1308 | * Forward the frame | |
1309 | */ | |
1310 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1311 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1312 | if (psend != -1) { |
1313 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1314 | if (skb2) | |
1315 | ipmr_queue_xmit(skb2, cache, psend); | |
1316 | } | |
1317 | psend=ct; | |
1318 | } | |
1319 | } | |
1320 | if (psend != -1) { | |
1321 | if (local) { | |
1322 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1323 | if (skb2) | |
1324 | ipmr_queue_xmit(skb2, cache, psend); | |
1325 | } else { | |
1326 | ipmr_queue_xmit(skb, cache, psend); | |
1327 | return 0; | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | dont_forward: | |
1332 | if (!local) | |
1333 | kfree_skb(skb); | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1337 | ||
1338 | /* | |
1339 | * Multicast packets for forwarding arrive here | |
1340 | */ | |
1341 | ||
1342 | int ip_mr_input(struct sk_buff *skb) | |
1343 | { | |
1344 | struct mfc_cache *cache; | |
1345 | int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; | |
1346 | ||
1347 | /* Packet is looped back after forward, it should not be | |
1348 | forwarded second time, but still can be delivered locally. | |
1349 | */ | |
1350 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1351 | goto dont_forward; | |
1352 | ||
1353 | if (!local) { | |
1354 | if (IPCB(skb)->opt.router_alert) { | |
1355 | if (ip_call_ra_chain(skb)) | |
1356 | return 0; | |
eddc9ec5 | 1357 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1358 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1359 | Cisco IOS <= 11.2(8)) do not put router alert | |
1360 | option to IGMP packets destined to routable | |
1361 | groups. It is very bad, because it means | |
1362 | that we can forward NO IGMP messages. | |
1363 | */ | |
1364 | read_lock(&mrt_lock); | |
1365 | if (mroute_socket) { | |
2715bcf9 | 1366 | nf_reset(skb); |
1da177e4 LT |
1367 | raw_rcv(mroute_socket, skb); |
1368 | read_unlock(&mrt_lock); | |
1369 | return 0; | |
1370 | } | |
1371 | read_unlock(&mrt_lock); | |
1372 | } | |
1373 | } | |
1374 | ||
1375 | read_lock(&mrt_lock); | |
eddc9ec5 | 1376 | cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1377 | |
1378 | /* | |
1379 | * No usable cache entry | |
1380 | */ | |
1381 | if (cache==NULL) { | |
1382 | int vif; | |
1383 | ||
1384 | if (local) { | |
1385 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1386 | ip_local_deliver(skb); | |
1387 | if (skb2 == NULL) { | |
1388 | read_unlock(&mrt_lock); | |
1389 | return -ENOBUFS; | |
1390 | } | |
1391 | skb = skb2; | |
1392 | } | |
1393 | ||
1394 | vif = ipmr_find_vif(skb->dev); | |
1395 | if (vif >= 0) { | |
1396 | int err = ipmr_cache_unresolved(vif, skb); | |
1397 | read_unlock(&mrt_lock); | |
1398 | ||
1399 | return err; | |
1400 | } | |
1401 | read_unlock(&mrt_lock); | |
1402 | kfree_skb(skb); | |
1403 | return -ENODEV; | |
1404 | } | |
1405 | ||
1406 | ip_mr_forward(skb, cache, local); | |
1407 | ||
1408 | read_unlock(&mrt_lock); | |
1409 | ||
1410 | if (local) | |
1411 | return ip_local_deliver(skb); | |
1412 | ||
1413 | return 0; | |
1414 | ||
1415 | dont_forward: | |
1416 | if (local) | |
1417 | return ip_local_deliver(skb); | |
1418 | kfree_skb(skb); | |
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | #ifdef CONFIG_IP_PIMSM_V1 | |
1423 | /* | |
1424 | * Handle IGMP messages of PIMv1 | |
1425 | */ | |
1426 | ||
1427 | int pim_rcv_v1(struct sk_buff * skb) | |
1428 | { | |
1429 | struct igmphdr *pim; | |
1430 | struct iphdr *encap; | |
1431 | struct net_device *reg_dev = NULL; | |
1432 | ||
e905a9ed | 1433 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1434 | goto drop; |
1435 | ||
d9edf9e2 | 1436 | pim = igmp_hdr(skb); |
1da177e4 | 1437 | |
e905a9ed | 1438 | if (!mroute_do_pim || |
1da177e4 | 1439 | skb->len < sizeof(*pim) + sizeof(*encap) || |
e905a9ed | 1440 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1da177e4 LT |
1441 | goto drop; |
1442 | ||
9c70220b ACM |
1443 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1444 | sizeof(struct igmphdr)); | |
1da177e4 LT |
1445 | /* |
1446 | Check that: | |
1447 | a. packet is really destinted to a multicast group | |
1448 | b. packet is not a NULL-REGISTER | |
1449 | c. packet is not truncated | |
1450 | */ | |
1451 | if (!MULTICAST(encap->daddr) || | |
1452 | encap->tot_len == 0 || | |
e905a9ed | 1453 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1454 | goto drop; |
1455 | ||
1456 | read_lock(&mrt_lock); | |
1457 | if (reg_vif_num >= 0) | |
1458 | reg_dev = vif_table[reg_vif_num].dev; | |
1459 | if (reg_dev) | |
1460 | dev_hold(reg_dev); | |
1461 | read_unlock(&mrt_lock); | |
1462 | ||
e905a9ed | 1463 | if (reg_dev == NULL) |
1da177e4 LT |
1464 | goto drop; |
1465 | ||
b0e380b1 | 1466 | skb->mac_header = skb->network_header; |
1da177e4 | 1467 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1468 | skb_reset_network_header(skb); |
1da177e4 | 1469 | skb->dev = reg_dev; |
1da177e4 LT |
1470 | skb->protocol = htons(ETH_P_IP); |
1471 | skb->ip_summed = 0; | |
1472 | skb->pkt_type = PACKET_HOST; | |
1473 | dst_release(skb->dst); | |
1474 | skb->dst = NULL; | |
2941a486 PM |
1475 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
1476 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; | |
1da177e4 LT |
1477 | nf_reset(skb); |
1478 | netif_rx(skb); | |
1479 | dev_put(reg_dev); | |
1480 | return 0; | |
1481 | drop: | |
1482 | kfree_skb(skb); | |
1483 | return 0; | |
1484 | } | |
1485 | #endif | |
1486 | ||
1487 | #ifdef CONFIG_IP_PIMSM_V2 | |
1488 | static int pim_rcv(struct sk_buff * skb) | |
1489 | { | |
1490 | struct pimreghdr *pim; | |
1491 | struct iphdr *encap; | |
1492 | struct net_device *reg_dev = NULL; | |
1493 | ||
e905a9ed | 1494 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1495 | goto drop; |
1496 | ||
9c70220b | 1497 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1498 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1499 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1500 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1501 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1502 | goto drop; |
1503 | ||
1504 | /* check if the inner packet is destined to mcast group */ | |
9c70220b ACM |
1505 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1506 | sizeof(struct pimreghdr)); | |
1da177e4 LT |
1507 | if (!MULTICAST(encap->daddr) || |
1508 | encap->tot_len == 0 || | |
e905a9ed | 1509 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1510 | goto drop; |
1511 | ||
1512 | read_lock(&mrt_lock); | |
1513 | if (reg_vif_num >= 0) | |
1514 | reg_dev = vif_table[reg_vif_num].dev; | |
1515 | if (reg_dev) | |
1516 | dev_hold(reg_dev); | |
1517 | read_unlock(&mrt_lock); | |
1518 | ||
e905a9ed | 1519 | if (reg_dev == NULL) |
1da177e4 LT |
1520 | goto drop; |
1521 | ||
b0e380b1 | 1522 | skb->mac_header = skb->network_header; |
1da177e4 | 1523 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1524 | skb_reset_network_header(skb); |
1da177e4 | 1525 | skb->dev = reg_dev; |
1da177e4 LT |
1526 | skb->protocol = htons(ETH_P_IP); |
1527 | skb->ip_summed = 0; | |
1528 | skb->pkt_type = PACKET_HOST; | |
1529 | dst_release(skb->dst); | |
2941a486 PM |
1530 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
1531 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; | |
1da177e4 LT |
1532 | skb->dst = NULL; |
1533 | nf_reset(skb); | |
1534 | netif_rx(skb); | |
1535 | dev_put(reg_dev); | |
1536 | return 0; | |
1537 | drop: | |
1538 | kfree_skb(skb); | |
1539 | return 0; | |
1540 | } | |
1541 | #endif | |
1542 | ||
1543 | static int | |
1544 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1545 | { | |
1546 | int ct; | |
1547 | struct rtnexthop *nhp; | |
1548 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
27a884dc | 1549 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1550 | struct rtattr *mp_head; |
1551 | ||
1552 | if (dev) | |
1553 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1554 | ||
1555 | mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); | |
1556 | ||
1557 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1558 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1559 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1560 | goto rtattr_failure; | |
1561 | nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1562 | nhp->rtnh_flags = 0; | |
1563 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1564 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1565 | nhp->rtnh_len = sizeof(*nhp); | |
1566 | } | |
1567 | } | |
1568 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1569 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1570 | rtm->rtm_type = RTN_MULTICAST; |
1571 | return 1; | |
1572 | ||
1573 | rtattr_failure: | |
dc5fc579 | 1574 | nlmsg_trim(skb, b); |
1da177e4 LT |
1575 | return -EMSGSIZE; |
1576 | } | |
1577 | ||
1578 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1579 | { | |
1580 | int err; | |
1581 | struct mfc_cache *cache; | |
1582 | struct rtable *rt = (struct rtable*)skb->dst; | |
1583 | ||
1584 | read_lock(&mrt_lock); | |
1585 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1586 | ||
1587 | if (cache==NULL) { | |
72287490 | 1588 | struct sk_buff *skb2; |
eddc9ec5 | 1589 | struct iphdr *iph; |
1da177e4 LT |
1590 | struct net_device *dev; |
1591 | int vif; | |
1592 | ||
1593 | if (nowait) { | |
1594 | read_unlock(&mrt_lock); | |
1595 | return -EAGAIN; | |
1596 | } | |
1597 | ||
1598 | dev = skb->dev; | |
1599 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1600 | read_unlock(&mrt_lock); | |
1601 | return -ENODEV; | |
1602 | } | |
72287490 AK |
1603 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1604 | if (!skb2) { | |
1605 | read_unlock(&mrt_lock); | |
1606 | return -ENOMEM; | |
1607 | } | |
1608 | ||
e2d1bca7 ACM |
1609 | skb_push(skb2, sizeof(struct iphdr)); |
1610 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1611 | iph = ip_hdr(skb2); |
1612 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1613 | iph->saddr = rt->rt_src; | |
1614 | iph->daddr = rt->rt_dst; | |
1615 | iph->version = 0; | |
72287490 | 1616 | err = ipmr_cache_unresolved(vif, skb2); |
1da177e4 LT |
1617 | read_unlock(&mrt_lock); |
1618 | return err; | |
1619 | } | |
1620 | ||
1621 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1622 | cache->mfc_flags |= MFC_NOTIFY; | |
1623 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1624 | read_unlock(&mrt_lock); | |
1625 | return err; | |
1626 | } | |
1627 | ||
e905a9ed | 1628 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1629 | /* |
1630 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1631 | */ | |
1632 | struct ipmr_vif_iter { | |
1633 | int ct; | |
1634 | }; | |
1635 | ||
1636 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1637 | loff_t pos) | |
1638 | { | |
1639 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
132adf54 | 1640 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 | 1641 | continue; |
e905a9ed | 1642 | if (pos-- == 0) |
1da177e4 LT |
1643 | return &vif_table[iter->ct]; |
1644 | } | |
1645 | return NULL; | |
1646 | } | |
1647 | ||
1648 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
1649 | { | |
1650 | read_lock(&mrt_lock); | |
e905a9ed | 1651 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1652 | : SEQ_START_TOKEN; |
1653 | } | |
1654 | ||
1655 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1656 | { | |
1657 | struct ipmr_vif_iter *iter = seq->private; | |
1658 | ||
1659 | ++*pos; | |
1660 | if (v == SEQ_START_TOKEN) | |
1661 | return ipmr_vif_seq_idx(iter, 0); | |
e905a9ed | 1662 | |
1da177e4 | 1663 | while (++iter->ct < maxvif) { |
132adf54 | 1664 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 LT |
1665 | continue; |
1666 | return &vif_table[iter->ct]; | |
1667 | } | |
1668 | return NULL; | |
1669 | } | |
1670 | ||
1671 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
1672 | { | |
1673 | read_unlock(&mrt_lock); | |
1674 | } | |
1675 | ||
1676 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1677 | { | |
1678 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1679 | seq_puts(seq, |
1da177e4 LT |
1680 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1681 | } else { | |
1682 | const struct vif_device *vif = v; | |
1683 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1684 | ||
1685 | seq_printf(seq, | |
1686 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1687 | vif - vif_table, | |
e905a9ed | 1688 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1689 | vif->bytes_out, vif->pkt_out, |
1690 | vif->flags, vif->local, vif->remote); | |
1691 | } | |
1692 | return 0; | |
1693 | } | |
1694 | ||
f690808e | 1695 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1696 | .start = ipmr_vif_seq_start, |
1697 | .next = ipmr_vif_seq_next, | |
1698 | .stop = ipmr_vif_seq_stop, | |
1699 | .show = ipmr_vif_seq_show, | |
1700 | }; | |
1701 | ||
1702 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1703 | { | |
1704 | struct seq_file *seq; | |
1705 | int rc = -ENOMEM; | |
1706 | struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e905a9ed | 1707 | |
1da177e4 LT |
1708 | if (!s) |
1709 | goto out; | |
1710 | ||
1711 | rc = seq_open(file, &ipmr_vif_seq_ops); | |
1712 | if (rc) | |
1713 | goto out_kfree; | |
1714 | ||
1715 | s->ct = 0; | |
1716 | seq = file->private_data; | |
1717 | seq->private = s; | |
1718 | out: | |
1719 | return rc; | |
1720 | out_kfree: | |
1721 | kfree(s); | |
1722 | goto out; | |
1723 | ||
1724 | } | |
1725 | ||
9a32144e | 1726 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1727 | .owner = THIS_MODULE, |
1728 | .open = ipmr_vif_open, | |
1729 | .read = seq_read, | |
1730 | .llseek = seq_lseek, | |
1731 | .release = seq_release_private, | |
1732 | }; | |
1733 | ||
1734 | struct ipmr_mfc_iter { | |
1735 | struct mfc_cache **cache; | |
1736 | int ct; | |
1737 | }; | |
1738 | ||
1739 | ||
1740 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1741 | { | |
1742 | struct mfc_cache *mfc; | |
1743 | ||
1744 | it->cache = mfc_cache_array; | |
1745 | read_lock(&mrt_lock); | |
e905a9ed | 1746 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
132adf54 | 1747 | for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) |
e905a9ed | 1748 | if (pos-- == 0) |
1da177e4 LT |
1749 | return mfc; |
1750 | read_unlock(&mrt_lock); | |
1751 | ||
1752 | it->cache = &mfc_unres_queue; | |
1753 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1754 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
1da177e4 LT |
1755 | if (pos-- == 0) |
1756 | return mfc; | |
1757 | spin_unlock_bh(&mfc_unres_lock); | |
1758 | ||
1759 | it->cache = NULL; | |
1760 | return NULL; | |
1761 | } | |
1762 | ||
1763 | ||
1764 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1765 | { | |
1766 | struct ipmr_mfc_iter *it = seq->private; | |
1767 | it->cache = NULL; | |
1768 | it->ct = 0; | |
e905a9ed | 1769 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1770 | : SEQ_START_TOKEN; |
1771 | } | |
1772 | ||
1773 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1774 | { | |
1775 | struct mfc_cache *mfc = v; | |
1776 | struct ipmr_mfc_iter *it = seq->private; | |
1777 | ||
1778 | ++*pos; | |
1779 | ||
1780 | if (v == SEQ_START_TOKEN) | |
1781 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1782 | ||
1783 | if (mfc->next) | |
1784 | return mfc->next; | |
e905a9ed YH |
1785 | |
1786 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1787 | goto end_of_list; |
1788 | ||
1789 | BUG_ON(it->cache != mfc_cache_array); | |
1790 | ||
1791 | while (++it->ct < MFC_LINES) { | |
1792 | mfc = mfc_cache_array[it->ct]; | |
1793 | if (mfc) | |
1794 | return mfc; | |
1795 | } | |
1796 | ||
1797 | /* exhausted cache_array, show unresolved */ | |
1798 | read_unlock(&mrt_lock); | |
1799 | it->cache = &mfc_unres_queue; | |
1800 | it->ct = 0; | |
e905a9ed | 1801 | |
1da177e4 LT |
1802 | spin_lock_bh(&mfc_unres_lock); |
1803 | mfc = mfc_unres_queue; | |
e905a9ed | 1804 | if (mfc) |
1da177e4 LT |
1805 | return mfc; |
1806 | ||
1807 | end_of_list: | |
1808 | spin_unlock_bh(&mfc_unres_lock); | |
1809 | it->cache = NULL; | |
1810 | ||
1811 | return NULL; | |
1812 | } | |
1813 | ||
1814 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1815 | { | |
1816 | struct ipmr_mfc_iter *it = seq->private; | |
1817 | ||
1818 | if (it->cache == &mfc_unres_queue) | |
1819 | spin_unlock_bh(&mfc_unres_lock); | |
1820 | else if (it->cache == mfc_cache_array) | |
1821 | read_unlock(&mrt_lock); | |
1822 | } | |
1823 | ||
1824 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1825 | { | |
1826 | int n; | |
1827 | ||
1828 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1829 | seq_puts(seq, |
1da177e4 LT |
1830 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1831 | } else { | |
1832 | const struct mfc_cache *mfc = v; | |
1833 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1834 | |
1da177e4 LT |
1835 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", |
1836 | (unsigned long) mfc->mfc_mcastgrp, | |
1837 | (unsigned long) mfc->mfc_origin, | |
1838 | mfc->mfc_parent, | |
1839 | mfc->mfc_un.res.pkt, | |
1840 | mfc->mfc_un.res.bytes, | |
1841 | mfc->mfc_un.res.wrong_if); | |
1842 | ||
1843 | if (it->cache != &mfc_unres_queue) { | |
132adf54 SH |
1844 | for (n = mfc->mfc_un.res.minvif; |
1845 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1846 | if (VIF_EXISTS(n) | |
1da177e4 | 1847 | && mfc->mfc_un.res.ttls[n] < 255) |
e905a9ed YH |
1848 | seq_printf(seq, |
1849 | " %2d:%-3d", | |
1da177e4 LT |
1850 | n, mfc->mfc_un.res.ttls[n]); |
1851 | } | |
1852 | } | |
1853 | seq_putc(seq, '\n'); | |
1854 | } | |
1855 | return 0; | |
1856 | } | |
1857 | ||
f690808e | 1858 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1859 | .start = ipmr_mfc_seq_start, |
1860 | .next = ipmr_mfc_seq_next, | |
1861 | .stop = ipmr_mfc_seq_stop, | |
1862 | .show = ipmr_mfc_seq_show, | |
1863 | }; | |
1864 | ||
1865 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1866 | { | |
1867 | struct seq_file *seq; | |
1868 | int rc = -ENOMEM; | |
1869 | struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e905a9ed | 1870 | |
1da177e4 LT |
1871 | if (!s) |
1872 | goto out; | |
1873 | ||
1874 | rc = seq_open(file, &ipmr_mfc_seq_ops); | |
1875 | if (rc) | |
1876 | goto out_kfree; | |
1877 | ||
1878 | seq = file->private_data; | |
1879 | seq->private = s; | |
1880 | out: | |
1881 | return rc; | |
1882 | out_kfree: | |
1883 | kfree(s); | |
1884 | goto out; | |
1885 | ||
1886 | } | |
1887 | ||
9a32144e | 1888 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1889 | .owner = THIS_MODULE, |
1890 | .open = ipmr_mfc_open, | |
1891 | .read = seq_read, | |
1892 | .llseek = seq_lseek, | |
1893 | .release = seq_release_private, | |
1894 | }; | |
e905a9ed | 1895 | #endif |
1da177e4 LT |
1896 | |
1897 | #ifdef CONFIG_IP_PIMSM_V2 | |
1898 | static struct net_protocol pim_protocol = { | |
1899 | .handler = pim_rcv, | |
1900 | }; | |
1901 | #endif | |
1902 | ||
1903 | ||
1904 | /* | |
1905 | * Setup for IP multicast routing | |
1906 | */ | |
e905a9ed | 1907 | |
1da177e4 LT |
1908 | void __init ip_mr_init(void) |
1909 | { | |
1910 | mrt_cachep = kmem_cache_create("ip_mrt_cache", | |
1911 | sizeof(struct mfc_cache), | |
e5d679f3 | 1912 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
1da177e4 | 1913 | NULL, NULL); |
1da177e4 LT |
1914 | init_timer(&ipmr_expire_timer); |
1915 | ipmr_expire_timer.function=ipmr_expire_process; | |
1916 | register_netdevice_notifier(&ip_mr_notifier); | |
e905a9ed | 1917 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1918 | proc_net_fops_create("ip_mr_vif", 0, &ipmr_vif_fops); |
1919 | proc_net_fops_create("ip_mr_cache", 0, &ipmr_mfc_fops); | |
e905a9ed | 1920 | #endif |
1da177e4 | 1921 | } |