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> |
457c4cbc | 52 | #include <net/net_namespace.h> |
1da177e4 LT |
53 | #include <net/ip.h> |
54 | #include <net/protocol.h> | |
55 | #include <linux/skbuff.h> | |
14c85021 | 56 | #include <net/route.h> |
1da177e4 LT |
57 | #include <net/sock.h> |
58 | #include <net/icmp.h> | |
59 | #include <net/udp.h> | |
60 | #include <net/raw.h> | |
61 | #include <linux/notifier.h> | |
62 | #include <linux/if_arp.h> | |
63 | #include <linux/netfilter_ipv4.h> | |
64 | #include <net/ipip.h> | |
65 | #include <net/checksum.h> | |
dc5fc579 | 66 | #include <net/netlink.h> |
1da177e4 LT |
67 | |
68 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
69 | #define CONFIG_IP_PIMSM 1 | |
70 | #endif | |
71 | ||
72 | static struct sock *mroute_socket; | |
73 | ||
74 | ||
75 | /* Big lock, protecting vif table, mrt cache and mroute socket state. | |
76 | Note that the changes are semaphored via rtnl_lock. | |
77 | */ | |
78 | ||
79 | static DEFINE_RWLOCK(mrt_lock); | |
80 | ||
81 | /* | |
82 | * Multicast router control variables | |
83 | */ | |
84 | ||
85 | static struct vif_device vif_table[MAXVIFS]; /* Devices */ | |
86 | static int maxvif; | |
87 | ||
88 | #define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) | |
89 | ||
90 | static int mroute_do_assert; /* Set in PIM assert */ | |
91 | static int mroute_do_pim; | |
92 | ||
93 | static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ | |
94 | ||
95 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ | |
96 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ | |
97 | ||
98 | /* Special spinlock for queue of unresolved entries */ | |
99 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
100 | ||
101 | /* We return to original Alan's scheme. Hash table of resolved | |
102 | entries is changed only in process context and protected | |
103 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
104 | with strong spinlock mfc_unres_lock. | |
105 | ||
106 | In this case data path is free of exclusive locks at all. | |
107 | */ | |
108 | ||
e18b890b | 109 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
110 | |
111 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
112 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
113 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
114 | ||
115 | #ifdef CONFIG_IP_PIMSM_V2 | |
116 | static struct net_protocol pim_protocol; | |
117 | #endif | |
118 | ||
119 | static struct timer_list ipmr_expire_timer; | |
120 | ||
121 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
122 | ||
123 | static | |
124 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
125 | { | |
126 | struct net_device *dev; | |
127 | ||
128 | dev = __dev_get_by_name("tunl0"); | |
129 | ||
130 | if (dev) { | |
131 | int err; | |
132 | struct ifreq ifr; | |
133 | mm_segment_t oldfs; | |
134 | struct ip_tunnel_parm p; | |
135 | struct in_device *in_dev; | |
136 | ||
137 | memset(&p, 0, sizeof(p)); | |
138 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
139 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
140 | p.iph.version = 4; | |
141 | p.iph.ihl = 5; | |
142 | p.iph.protocol = IPPROTO_IPIP; | |
143 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
144 | ifr.ifr_ifru.ifru_data = (void*)&p; | |
145 | ||
146 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
147 | err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
148 | set_fs(oldfs); | |
149 | ||
150 | dev = NULL; | |
151 | ||
152 | if (err == 0 && (dev = __dev_get_by_name(p.name)) != NULL) { | |
153 | dev->flags |= IFF_MULTICAST; | |
154 | ||
e5ed6399 | 155 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 156 | if (in_dev == NULL) |
1da177e4 | 157 | goto failure; |
71e27da9 HX |
158 | |
159 | ipv4_devconf_setall(in_dev); | |
160 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
161 | |
162 | if (dev_open(dev)) | |
163 | goto failure; | |
164 | } | |
165 | } | |
166 | return dev; | |
167 | ||
168 | failure: | |
169 | /* allow the register to be completed before unregistering. */ | |
170 | rtnl_unlock(); | |
171 | rtnl_lock(); | |
172 | ||
173 | unregister_netdevice(dev); | |
174 | return NULL; | |
175 | } | |
176 | ||
177 | #ifdef CONFIG_IP_PIMSM | |
178 | ||
179 | static int reg_vif_num = -1; | |
180 | ||
181 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
182 | { | |
183 | read_lock(&mrt_lock); | |
2941a486 PM |
184 | ((struct net_device_stats*)netdev_priv(dev))->tx_bytes += skb->len; |
185 | ((struct net_device_stats*)netdev_priv(dev))->tx_packets++; | |
1da177e4 LT |
186 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); |
187 | read_unlock(&mrt_lock); | |
188 | kfree_skb(skb); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static struct net_device_stats *reg_vif_get_stats(struct net_device *dev) | |
193 | { | |
2941a486 | 194 | return (struct net_device_stats*)netdev_priv(dev); |
1da177e4 LT |
195 | } |
196 | ||
197 | static void reg_vif_setup(struct net_device *dev) | |
198 | { | |
199 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 200 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 LT |
201 | dev->flags = IFF_NOARP; |
202 | dev->hard_start_xmit = reg_vif_xmit; | |
203 | dev->get_stats = reg_vif_get_stats; | |
204 | dev->destructor = free_netdev; | |
205 | } | |
206 | ||
207 | static struct net_device *ipmr_reg_vif(void) | |
208 | { | |
209 | struct net_device *dev; | |
210 | struct in_device *in_dev; | |
211 | ||
212 | dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg", | |
213 | reg_vif_setup); | |
214 | ||
215 | if (dev == NULL) | |
216 | return NULL; | |
217 | ||
218 | if (register_netdevice(dev)) { | |
219 | free_netdev(dev); | |
220 | return NULL; | |
221 | } | |
222 | dev->iflink = 0; | |
223 | ||
71e27da9 HX |
224 | rcu_read_lock(); |
225 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
226 | rcu_read_unlock(); | |
1da177e4 | 227 | goto failure; |
71e27da9 | 228 | } |
1da177e4 | 229 | |
71e27da9 HX |
230 | ipv4_devconf_setall(in_dev); |
231 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
232 | rcu_read_unlock(); | |
1da177e4 LT |
233 | |
234 | if (dev_open(dev)) | |
235 | goto failure; | |
236 | ||
237 | return dev; | |
238 | ||
239 | failure: | |
240 | /* allow the register to be completed before unregistering. */ | |
241 | rtnl_unlock(); | |
242 | rtnl_lock(); | |
243 | ||
244 | unregister_netdevice(dev); | |
245 | return NULL; | |
246 | } | |
247 | #endif | |
248 | ||
249 | /* | |
250 | * Delete a VIF entry | |
251 | */ | |
e905a9ed | 252 | |
1da177e4 LT |
253 | static int vif_delete(int vifi) |
254 | { | |
255 | struct vif_device *v; | |
256 | struct net_device *dev; | |
257 | struct in_device *in_dev; | |
258 | ||
259 | if (vifi < 0 || vifi >= maxvif) | |
260 | return -EADDRNOTAVAIL; | |
261 | ||
262 | v = &vif_table[vifi]; | |
263 | ||
264 | write_lock_bh(&mrt_lock); | |
265 | dev = v->dev; | |
266 | v->dev = NULL; | |
267 | ||
268 | if (!dev) { | |
269 | write_unlock_bh(&mrt_lock); | |
270 | return -EADDRNOTAVAIL; | |
271 | } | |
272 | ||
273 | #ifdef CONFIG_IP_PIMSM | |
274 | if (vifi == reg_vif_num) | |
275 | reg_vif_num = -1; | |
276 | #endif | |
277 | ||
278 | if (vifi+1 == maxvif) { | |
279 | int tmp; | |
280 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
281 | if (VIF_EXISTS(tmp)) | |
282 | break; | |
283 | } | |
284 | maxvif = tmp+1; | |
285 | } | |
286 | ||
287 | write_unlock_bh(&mrt_lock); | |
288 | ||
289 | dev_set_allmulti(dev, -1); | |
290 | ||
e5ed6399 | 291 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 292 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
293 | ip_rt_multicast_event(in_dev); |
294 | } | |
295 | ||
296 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
297 | unregister_netdevice(dev); | |
298 | ||
299 | dev_put(dev); | |
300 | return 0; | |
301 | } | |
302 | ||
303 | /* Destroy an unresolved cache entry, killing queued skbs | |
304 | and reporting error to netlink readers. | |
305 | */ | |
306 | ||
307 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
308 | { | |
309 | struct sk_buff *skb; | |
9ef1d4c7 | 310 | struct nlmsgerr *e; |
1da177e4 LT |
311 | |
312 | atomic_dec(&cache_resolve_queue_len); | |
313 | ||
132adf54 | 314 | while ((skb=skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 315 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
316 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
317 | nlh->nlmsg_type = NLMSG_ERROR; | |
318 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
319 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
320 | e = NLMSG_DATA(nlh); |
321 | e->error = -ETIMEDOUT; | |
322 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 TG |
323 | |
324 | rtnl_unicast(skb, NETLINK_CB(skb).pid); | |
1da177e4 LT |
325 | } else |
326 | kfree_skb(skb); | |
327 | } | |
328 | ||
329 | kmem_cache_free(mrt_cachep, c); | |
330 | } | |
331 | ||
332 | ||
333 | /* Single timer process for all the unresolved queue. */ | |
334 | ||
335 | static void ipmr_expire_process(unsigned long dummy) | |
336 | { | |
337 | unsigned long now; | |
338 | unsigned long expires; | |
339 | struct mfc_cache *c, **cp; | |
340 | ||
341 | if (!spin_trylock(&mfc_unres_lock)) { | |
342 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
343 | return; | |
344 | } | |
345 | ||
346 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
347 | goto out; | |
348 | ||
349 | now = jiffies; | |
350 | expires = 10*HZ; | |
351 | cp = &mfc_unres_queue; | |
352 | ||
353 | while ((c=*cp) != NULL) { | |
354 | if (time_after(c->mfc_un.unres.expires, now)) { | |
355 | unsigned long interval = c->mfc_un.unres.expires - now; | |
356 | if (interval < expires) | |
357 | expires = interval; | |
358 | cp = &c->next; | |
359 | continue; | |
360 | } | |
361 | ||
362 | *cp = c->next; | |
363 | ||
364 | ipmr_destroy_unres(c); | |
365 | } | |
366 | ||
367 | if (atomic_read(&cache_resolve_queue_len)) | |
368 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
369 | ||
370 | out: | |
371 | spin_unlock(&mfc_unres_lock); | |
372 | } | |
373 | ||
374 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
375 | ||
d1b04c08 | 376 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
377 | { |
378 | int vifi; | |
379 | ||
380 | cache->mfc_un.res.minvif = MAXVIFS; | |
381 | cache->mfc_un.res.maxvif = 0; | |
382 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
383 | ||
384 | for (vifi=0; vifi<maxvif; vifi++) { | |
385 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
386 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
387 | if (cache->mfc_un.res.minvif > vifi) | |
388 | cache->mfc_un.res.minvif = vifi; | |
389 | if (cache->mfc_un.res.maxvif <= vifi) | |
390 | cache->mfc_un.res.maxvif = vifi + 1; | |
391 | } | |
392 | } | |
393 | } | |
394 | ||
395 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
396 | { | |
397 | int vifi = vifc->vifc_vifi; | |
398 | struct vif_device *v = &vif_table[vifi]; | |
399 | struct net_device *dev; | |
400 | struct in_device *in_dev; | |
401 | ||
402 | /* Is vif busy ? */ | |
403 | if (VIF_EXISTS(vifi)) | |
404 | return -EADDRINUSE; | |
405 | ||
406 | switch (vifc->vifc_flags) { | |
407 | #ifdef CONFIG_IP_PIMSM | |
408 | case VIFF_REGISTER: | |
409 | /* | |
410 | * Special Purpose VIF in PIM | |
411 | * All the packets will be sent to the daemon | |
412 | */ | |
413 | if (reg_vif_num >= 0) | |
414 | return -EADDRINUSE; | |
415 | dev = ipmr_reg_vif(); | |
416 | if (!dev) | |
417 | return -ENOBUFS; | |
418 | break; | |
419 | #endif | |
e905a9ed | 420 | case VIFF_TUNNEL: |
1da177e4 LT |
421 | dev = ipmr_new_tunnel(vifc); |
422 | if (!dev) | |
423 | return -ENOBUFS; | |
424 | break; | |
425 | case 0: | |
15333061 | 426 | dev = ip_dev_find(vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
427 | if (!dev) |
428 | return -EADDRNOTAVAIL; | |
15333061 | 429 | dev_put(dev); |
1da177e4 LT |
430 | break; |
431 | default: | |
432 | return -EINVAL; | |
433 | } | |
434 | ||
e5ed6399 | 435 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 | 436 | return -EADDRNOTAVAIL; |
42f811b8 | 437 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
438 | dev_set_allmulti(dev, +1); |
439 | ip_rt_multicast_event(in_dev); | |
440 | ||
441 | /* | |
442 | * Fill in the VIF structures | |
443 | */ | |
444 | v->rate_limit=vifc->vifc_rate_limit; | |
445 | v->local=vifc->vifc_lcl_addr.s_addr; | |
446 | v->remote=vifc->vifc_rmt_addr.s_addr; | |
447 | v->flags=vifc->vifc_flags; | |
448 | if (!mrtsock) | |
449 | v->flags |= VIFF_STATIC; | |
450 | v->threshold=vifc->vifc_threshold; | |
451 | v->bytes_in = 0; | |
452 | v->bytes_out = 0; | |
453 | v->pkt_in = 0; | |
454 | v->pkt_out = 0; | |
455 | v->link = dev->ifindex; | |
456 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
457 | v->link = dev->iflink; | |
458 | ||
459 | /* And finish update writing critical data */ | |
460 | write_lock_bh(&mrt_lock); | |
461 | dev_hold(dev); | |
462 | v->dev=dev; | |
463 | #ifdef CONFIG_IP_PIMSM | |
464 | if (v->flags&VIFF_REGISTER) | |
465 | reg_vif_num = vifi; | |
466 | #endif | |
467 | if (vifi+1 > maxvif) | |
468 | maxvif = vifi+1; | |
469 | write_unlock_bh(&mrt_lock); | |
470 | return 0; | |
471 | } | |
472 | ||
114c7844 | 473 | static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp) |
1da177e4 LT |
474 | { |
475 | int line=MFC_HASH(mcastgrp,origin); | |
476 | struct mfc_cache *c; | |
477 | ||
478 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
479 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
480 | break; | |
481 | } | |
482 | return c; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Allocate a multicast cache entry | |
487 | */ | |
488 | static struct mfc_cache *ipmr_cache_alloc(void) | |
489 | { | |
c3762229 | 490 | struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
132adf54 | 491 | if (c==NULL) |
1da177e4 | 492 | return NULL; |
1da177e4 LT |
493 | c->mfc_un.res.minvif = MAXVIFS; |
494 | return c; | |
495 | } | |
496 | ||
497 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
498 | { | |
c3762229 | 499 | struct mfc_cache *c=kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
132adf54 | 500 | if (c==NULL) |
1da177e4 | 501 | return NULL; |
1da177e4 LT |
502 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
503 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
504 | return c; | |
505 | } | |
506 | ||
507 | /* | |
508 | * A cache entry has gone into a resolved state from queued | |
509 | */ | |
e905a9ed | 510 | |
1da177e4 LT |
511 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
512 | { | |
513 | struct sk_buff *skb; | |
9ef1d4c7 | 514 | struct nlmsgerr *e; |
1da177e4 LT |
515 | |
516 | /* | |
517 | * Play the pending entries through our router | |
518 | */ | |
519 | ||
132adf54 | 520 | while ((skb=__skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 521 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
522 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
523 | ||
524 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
525 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
526 | (u8 *)nlh); | |
1da177e4 LT |
527 | } else { |
528 | nlh->nlmsg_type = NLMSG_ERROR; | |
529 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
530 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
531 | e = NLMSG_DATA(nlh); |
532 | e->error = -EMSGSIZE; | |
533 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 534 | } |
2942e900 TG |
535 | |
536 | rtnl_unicast(skb, NETLINK_CB(skb).pid); | |
1da177e4 LT |
537 | } else |
538 | ip_mr_forward(skb, c, 0); | |
539 | } | |
540 | } | |
541 | ||
542 | /* | |
543 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
544 | * expects the following bizarre scheme. | |
545 | * | |
546 | * Called under mrt_lock. | |
547 | */ | |
e905a9ed | 548 | |
1da177e4 LT |
549 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
550 | { | |
551 | struct sk_buff *skb; | |
c9bdd4b5 | 552 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
553 | struct igmphdr *igmp; |
554 | struct igmpmsg *msg; | |
555 | int ret; | |
556 | ||
557 | #ifdef CONFIG_IP_PIMSM | |
558 | if (assert == IGMPMSG_WHOLEPKT) | |
559 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
560 | else | |
561 | #endif | |
562 | skb = alloc_skb(128, GFP_ATOMIC); | |
563 | ||
132adf54 | 564 | if (!skb) |
1da177e4 LT |
565 | return -ENOBUFS; |
566 | ||
567 | #ifdef CONFIG_IP_PIMSM | |
568 | if (assert == IGMPMSG_WHOLEPKT) { | |
569 | /* Ugly, but we have no choice with this interface. | |
570 | Duplicate old header, fix ihl, length etc. | |
571 | And all this only to mangle msg->im_msgtype and | |
572 | to set msg->im_mbz to "mbz" :-) | |
573 | */ | |
878c8145 ACM |
574 | skb_push(skb, sizeof(struct iphdr)); |
575 | skb_reset_network_header(skb); | |
badff6d0 | 576 | skb_reset_transport_header(skb); |
0272ffc4 | 577 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 578 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
579 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
580 | msg->im_mbz = 0; | |
e905a9ed | 581 | msg->im_vif = reg_vif_num; |
eddc9ec5 ACM |
582 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
583 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
584 | sizeof(struct iphdr)); | |
e905a9ed | 585 | } else |
1da177e4 | 586 | #endif |
e905a9ed YH |
587 | { |
588 | ||
1da177e4 LT |
589 | /* |
590 | * Copy the IP header | |
591 | */ | |
592 | ||
27a884dc | 593 | skb->network_header = skb->tail; |
ddc7b8e3 | 594 | skb_put(skb, ihl); |
27d7ff46 | 595 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
596 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
597 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
598 | msg->im_vif = vifi; |
599 | skb->dst = dst_clone(pkt->dst); | |
600 | ||
601 | /* | |
602 | * Add our header | |
603 | */ | |
604 | ||
605 | igmp=(struct igmphdr *)skb_put(skb,sizeof(struct igmphdr)); | |
606 | igmp->type = | |
607 | msg->im_msgtype = assert; | |
608 | igmp->code = 0; | |
eddc9ec5 | 609 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 610 | skb->transport_header = skb->network_header; |
e905a9ed | 611 | } |
1da177e4 LT |
612 | |
613 | if (mroute_socket == NULL) { | |
614 | kfree_skb(skb); | |
615 | return -EINVAL; | |
616 | } | |
617 | ||
618 | /* | |
619 | * Deliver to mrouted | |
620 | */ | |
621 | if ((ret=sock_queue_rcv_skb(mroute_socket,skb))<0) { | |
622 | if (net_ratelimit()) | |
623 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
624 | kfree_skb(skb); | |
625 | } | |
626 | ||
627 | return ret; | |
628 | } | |
629 | ||
630 | /* | |
631 | * Queue a packet for resolution. It gets locked cache entry! | |
632 | */ | |
e905a9ed | 633 | |
1da177e4 LT |
634 | static int |
635 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
636 | { | |
637 | int err; | |
638 | struct mfc_cache *c; | |
eddc9ec5 | 639 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
640 | |
641 | spin_lock_bh(&mfc_unres_lock); | |
642 | for (c=mfc_unres_queue; c; c=c->next) { | |
eddc9ec5 ACM |
643 | if (c->mfc_mcastgrp == iph->daddr && |
644 | c->mfc_origin == iph->saddr) | |
1da177e4 LT |
645 | break; |
646 | } | |
647 | ||
648 | if (c == NULL) { | |
649 | /* | |
650 | * Create a new entry if allowable | |
651 | */ | |
652 | ||
653 | if (atomic_read(&cache_resolve_queue_len)>=10 || | |
654 | (c=ipmr_cache_alloc_unres())==NULL) { | |
655 | spin_unlock_bh(&mfc_unres_lock); | |
656 | ||
657 | kfree_skb(skb); | |
658 | return -ENOBUFS; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Fill in the new cache entry | |
663 | */ | |
eddc9ec5 ACM |
664 | c->mfc_parent = -1; |
665 | c->mfc_origin = iph->saddr; | |
666 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
667 | |
668 | /* | |
669 | * Reflect first query at mrouted. | |
670 | */ | |
671 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
e905a9ed | 672 | /* If the report failed throw the cache entry |
1da177e4 LT |
673 | out - Brad Parker |
674 | */ | |
675 | spin_unlock_bh(&mfc_unres_lock); | |
676 | ||
677 | kmem_cache_free(mrt_cachep, c); | |
678 | kfree_skb(skb); | |
679 | return err; | |
680 | } | |
681 | ||
682 | atomic_inc(&cache_resolve_queue_len); | |
683 | c->next = mfc_unres_queue; | |
684 | mfc_unres_queue = c; | |
685 | ||
686 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
687 | } | |
688 | ||
689 | /* | |
690 | * See if we can append the packet | |
691 | */ | |
692 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
693 | kfree_skb(skb); | |
694 | err = -ENOBUFS; | |
695 | } else { | |
696 | skb_queue_tail(&c->mfc_un.unres.unresolved,skb); | |
697 | err = 0; | |
698 | } | |
699 | ||
700 | spin_unlock_bh(&mfc_unres_lock); | |
701 | return err; | |
702 | } | |
703 | ||
704 | /* | |
705 | * MFC cache manipulation by user space mroute daemon | |
706 | */ | |
707 | ||
708 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
709 | { | |
710 | int line; | |
711 | struct mfc_cache *c, **cp; | |
712 | ||
713 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
714 | ||
715 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
716 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
717 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
718 | write_lock_bh(&mrt_lock); | |
719 | *cp = c->next; | |
720 | write_unlock_bh(&mrt_lock); | |
721 | ||
722 | kmem_cache_free(mrt_cachep, c); | |
723 | return 0; | |
724 | } | |
725 | } | |
726 | return -ENOENT; | |
727 | } | |
728 | ||
729 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
730 | { | |
731 | int line; | |
732 | struct mfc_cache *uc, *c, **cp; | |
733 | ||
734 | line=MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
735 | ||
736 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
737 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
738 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
739 | break; | |
740 | } | |
741 | ||
742 | if (c != NULL) { | |
743 | write_lock_bh(&mrt_lock); | |
744 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 745 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
746 | if (!mrtsock) |
747 | c->mfc_flags |= MFC_STATIC; | |
748 | write_unlock_bh(&mrt_lock); | |
749 | return 0; | |
750 | } | |
751 | ||
132adf54 | 752 | if (!MULTICAST(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
753 | return -EINVAL; |
754 | ||
755 | c=ipmr_cache_alloc(); | |
756 | if (c==NULL) | |
757 | return -ENOMEM; | |
758 | ||
759 | c->mfc_origin=mfc->mfcc_origin.s_addr; | |
760 | c->mfc_mcastgrp=mfc->mfcc_mcastgrp.s_addr; | |
761 | c->mfc_parent=mfc->mfcc_parent; | |
d1b04c08 | 762 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
763 | if (!mrtsock) |
764 | c->mfc_flags |= MFC_STATIC; | |
765 | ||
766 | write_lock_bh(&mrt_lock); | |
767 | c->next = mfc_cache_array[line]; | |
768 | mfc_cache_array[line] = c; | |
769 | write_unlock_bh(&mrt_lock); | |
770 | ||
771 | /* | |
772 | * Check to see if we resolved a queued list. If so we | |
773 | * need to send on the frames and tidy up. | |
774 | */ | |
775 | spin_lock_bh(&mfc_unres_lock); | |
776 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
777 | cp = &uc->next) { | |
778 | if (uc->mfc_origin == c->mfc_origin && | |
779 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
780 | *cp = uc->next; | |
781 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
782 | del_timer(&ipmr_expire_timer); | |
783 | break; | |
784 | } | |
785 | } | |
786 | spin_unlock_bh(&mfc_unres_lock); | |
787 | ||
788 | if (uc) { | |
789 | ipmr_cache_resolve(uc, c); | |
790 | kmem_cache_free(mrt_cachep, uc); | |
791 | } | |
792 | return 0; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Close the multicast socket, and clear the vif tables etc | |
797 | */ | |
e905a9ed | 798 | |
1da177e4 LT |
799 | static void mroute_clean_tables(struct sock *sk) |
800 | { | |
801 | int i; | |
e905a9ed | 802 | |
1da177e4 LT |
803 | /* |
804 | * Shut down all active vif entries | |
805 | */ | |
132adf54 | 806 | for (i=0; i<maxvif; i++) { |
1da177e4 LT |
807 | if (!(vif_table[i].flags&VIFF_STATIC)) |
808 | vif_delete(i); | |
809 | } | |
810 | ||
811 | /* | |
812 | * Wipe the cache | |
813 | */ | |
814 | for (i=0;i<MFC_LINES;i++) { | |
815 | struct mfc_cache *c, **cp; | |
816 | ||
817 | cp = &mfc_cache_array[i]; | |
818 | while ((c = *cp) != NULL) { | |
819 | if (c->mfc_flags&MFC_STATIC) { | |
820 | cp = &c->next; | |
821 | continue; | |
822 | } | |
823 | write_lock_bh(&mrt_lock); | |
824 | *cp = c->next; | |
825 | write_unlock_bh(&mrt_lock); | |
826 | ||
827 | kmem_cache_free(mrt_cachep, c); | |
828 | } | |
829 | } | |
830 | ||
831 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
832 | struct mfc_cache *c; | |
833 | ||
834 | spin_lock_bh(&mfc_unres_lock); | |
835 | while (mfc_unres_queue != NULL) { | |
836 | c = mfc_unres_queue; | |
837 | mfc_unres_queue = c->next; | |
838 | spin_unlock_bh(&mfc_unres_lock); | |
839 | ||
840 | ipmr_destroy_unres(c); | |
841 | ||
842 | spin_lock_bh(&mfc_unres_lock); | |
843 | } | |
844 | spin_unlock_bh(&mfc_unres_lock); | |
845 | } | |
846 | } | |
847 | ||
848 | static void mrtsock_destruct(struct sock *sk) | |
849 | { | |
850 | rtnl_lock(); | |
851 | if (sk == mroute_socket) { | |
42f811b8 | 852 | IPV4_DEVCONF_ALL(MC_FORWARDING)--; |
1da177e4 LT |
853 | |
854 | write_lock_bh(&mrt_lock); | |
855 | mroute_socket=NULL; | |
856 | write_unlock_bh(&mrt_lock); | |
857 | ||
858 | mroute_clean_tables(sk); | |
859 | } | |
860 | rtnl_unlock(); | |
861 | } | |
862 | ||
863 | /* | |
864 | * Socket options and virtual interface manipulation. The whole | |
865 | * virtual interface system is a complete heap, but unfortunately | |
866 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
867 | * MOSPF/PIM router set up we can clean this up. | |
868 | */ | |
e905a9ed | 869 | |
1da177e4 LT |
870 | int ip_mroute_setsockopt(struct sock *sk,int optname,char __user *optval,int optlen) |
871 | { | |
872 | int ret; | |
873 | struct vifctl vif; | |
874 | struct mfcctl mfc; | |
e905a9ed | 875 | |
132adf54 SH |
876 | if (optname != MRT_INIT) { |
877 | if (sk != mroute_socket && !capable(CAP_NET_ADMIN)) | |
1da177e4 LT |
878 | return -EACCES; |
879 | } | |
880 | ||
132adf54 SH |
881 | switch (optname) { |
882 | case MRT_INIT: | |
883 | if (sk->sk_type != SOCK_RAW || | |
884 | inet_sk(sk)->num != IPPROTO_IGMP) | |
885 | return -EOPNOTSUPP; | |
886 | if (optlen!=sizeof(int)) | |
887 | return -ENOPROTOOPT; | |
1da177e4 | 888 | |
132adf54 SH |
889 | rtnl_lock(); |
890 | if (mroute_socket) { | |
1da177e4 | 891 | rtnl_unlock(); |
132adf54 SH |
892 | return -EADDRINUSE; |
893 | } | |
894 | ||
895 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
896 | if (ret == 0) { | |
897 | write_lock_bh(&mrt_lock); | |
898 | mroute_socket=sk; | |
899 | write_unlock_bh(&mrt_lock); | |
900 | ||
42f811b8 | 901 | IPV4_DEVCONF_ALL(MC_FORWARDING)++; |
132adf54 SH |
902 | } |
903 | rtnl_unlock(); | |
904 | return ret; | |
905 | case MRT_DONE: | |
906 | if (sk!=mroute_socket) | |
907 | return -EACCES; | |
908 | return ip_ra_control(sk, 0, NULL); | |
909 | case MRT_ADD_VIF: | |
910 | case MRT_DEL_VIF: | |
911 | if (optlen!=sizeof(vif)) | |
912 | return -EINVAL; | |
913 | if (copy_from_user(&vif,optval,sizeof(vif))) | |
914 | return -EFAULT; | |
915 | if (vif.vifc_vifi >= MAXVIFS) | |
916 | return -ENFILE; | |
917 | rtnl_lock(); | |
918 | if (optname==MRT_ADD_VIF) { | |
919 | ret = vif_add(&vif, sk==mroute_socket); | |
920 | } else { | |
921 | ret = vif_delete(vif.vifc_vifi); | |
922 | } | |
923 | rtnl_unlock(); | |
924 | return ret; | |
1da177e4 LT |
925 | |
926 | /* | |
927 | * Manipulate the forwarding caches. These live | |
928 | * in a sort of kernel/user symbiosis. | |
929 | */ | |
132adf54 SH |
930 | case MRT_ADD_MFC: |
931 | case MRT_DEL_MFC: | |
932 | if (optlen!=sizeof(mfc)) | |
933 | return -EINVAL; | |
934 | if (copy_from_user(&mfc,optval, sizeof(mfc))) | |
935 | return -EFAULT; | |
936 | rtnl_lock(); | |
937 | if (optname==MRT_DEL_MFC) | |
938 | ret = ipmr_mfc_delete(&mfc); | |
939 | else | |
940 | ret = ipmr_mfc_add(&mfc, sk==mroute_socket); | |
941 | rtnl_unlock(); | |
942 | return ret; | |
1da177e4 LT |
943 | /* |
944 | * Control PIM assert. | |
945 | */ | |
132adf54 SH |
946 | case MRT_ASSERT: |
947 | { | |
948 | int v; | |
949 | if (get_user(v,(int __user *)optval)) | |
950 | return -EFAULT; | |
951 | mroute_do_assert=(v)?1:0; | |
952 | return 0; | |
953 | } | |
1da177e4 | 954 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
955 | case MRT_PIM: |
956 | { | |
957 | int v, ret; | |
958 | if (get_user(v,(int __user *)optval)) | |
959 | return -EFAULT; | |
960 | v = (v)?1:0; | |
961 | rtnl_lock(); | |
962 | ret = 0; | |
963 | if (v != mroute_do_pim) { | |
964 | mroute_do_pim = v; | |
965 | mroute_do_assert = v; | |
1da177e4 | 966 | #ifdef CONFIG_IP_PIMSM_V2 |
132adf54 SH |
967 | if (mroute_do_pim) |
968 | ret = inet_add_protocol(&pim_protocol, | |
969 | IPPROTO_PIM); | |
970 | else | |
971 | ret = inet_del_protocol(&pim_protocol, | |
972 | IPPROTO_PIM); | |
973 | if (ret < 0) | |
974 | ret = -EAGAIN; | |
1da177e4 | 975 | #endif |
1da177e4 | 976 | } |
132adf54 SH |
977 | rtnl_unlock(); |
978 | return ret; | |
979 | } | |
1da177e4 | 980 | #endif |
132adf54 SH |
981 | /* |
982 | * Spurious command, or MRT_VERSION which you cannot | |
983 | * set. | |
984 | */ | |
985 | default: | |
986 | return -ENOPROTOOPT; | |
1da177e4 LT |
987 | } |
988 | } | |
989 | ||
990 | /* | |
991 | * Getsock opt support for the multicast routing system. | |
992 | */ | |
e905a9ed | 993 | |
1da177e4 LT |
994 | int ip_mroute_getsockopt(struct sock *sk,int optname,char __user *optval,int __user *optlen) |
995 | { | |
996 | int olr; | |
997 | int val; | |
998 | ||
132adf54 | 999 | if (optname!=MRT_VERSION && |
1da177e4 LT |
1000 | #ifdef CONFIG_IP_PIMSM |
1001 | optname!=MRT_PIM && | |
1002 | #endif | |
1003 | optname!=MRT_ASSERT) | |
1004 | return -ENOPROTOOPT; | |
1005 | ||
1006 | if (get_user(olr, optlen)) | |
1007 | return -EFAULT; | |
1008 | ||
1009 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1010 | if (olr < 0) | |
1011 | return -EINVAL; | |
e905a9ed | 1012 | |
132adf54 | 1013 | if (put_user(olr,optlen)) |
1da177e4 | 1014 | return -EFAULT; |
132adf54 | 1015 | if (optname==MRT_VERSION) |
1da177e4 LT |
1016 | val=0x0305; |
1017 | #ifdef CONFIG_IP_PIMSM | |
132adf54 | 1018 | else if (optname==MRT_PIM) |
1da177e4 LT |
1019 | val=mroute_do_pim; |
1020 | #endif | |
1021 | else | |
1022 | val=mroute_do_assert; | |
132adf54 | 1023 | if (copy_to_user(optval,&val,olr)) |
1da177e4 LT |
1024 | return -EFAULT; |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * The IP multicast ioctl support routines. | |
1030 | */ | |
e905a9ed | 1031 | |
1da177e4 LT |
1032 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1033 | { | |
1034 | struct sioc_sg_req sr; | |
1035 | struct sioc_vif_req vr; | |
1036 | struct vif_device *vif; | |
1037 | struct mfc_cache *c; | |
e905a9ed | 1038 | |
132adf54 SH |
1039 | switch (cmd) { |
1040 | case SIOCGETVIFCNT: | |
1041 | if (copy_from_user(&vr,arg,sizeof(vr))) | |
1042 | return -EFAULT; | |
1043 | if (vr.vifi>=maxvif) | |
1044 | return -EINVAL; | |
1045 | read_lock(&mrt_lock); | |
1046 | vif=&vif_table[vr.vifi]; | |
1047 | if (VIF_EXISTS(vr.vifi)) { | |
1048 | vr.icount=vif->pkt_in; | |
1049 | vr.ocount=vif->pkt_out; | |
1050 | vr.ibytes=vif->bytes_in; | |
1051 | vr.obytes=vif->bytes_out; | |
1da177e4 | 1052 | read_unlock(&mrt_lock); |
1da177e4 | 1053 | |
132adf54 SH |
1054 | if (copy_to_user(arg,&vr,sizeof(vr))) |
1055 | return -EFAULT; | |
1056 | return 0; | |
1057 | } | |
1058 | read_unlock(&mrt_lock); | |
1059 | return -EADDRNOTAVAIL; | |
1060 | case SIOCGETSGCNT: | |
1061 | if (copy_from_user(&sr,arg,sizeof(sr))) | |
1062 | return -EFAULT; | |
1063 | ||
1064 | read_lock(&mrt_lock); | |
1065 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1066 | if (c) { | |
1067 | sr.pktcnt = c->mfc_un.res.pkt; | |
1068 | sr.bytecnt = c->mfc_un.res.bytes; | |
1069 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1070 | read_unlock(&mrt_lock); |
132adf54 SH |
1071 | |
1072 | if (copy_to_user(arg,&sr,sizeof(sr))) | |
1073 | return -EFAULT; | |
1074 | return 0; | |
1075 | } | |
1076 | read_unlock(&mrt_lock); | |
1077 | return -EADDRNOTAVAIL; | |
1078 | default: | |
1079 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1080 | } |
1081 | } | |
1082 | ||
1083 | ||
1084 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1085 | { | |
1086 | struct vif_device *v; | |
1087 | int ct; | |
1088 | if (event != NETDEV_UNREGISTER) | |
1089 | return NOTIFY_DONE; | |
1090 | v=&vif_table[0]; | |
132adf54 | 1091 | for (ct=0;ct<maxvif;ct++,v++) { |
1da177e4 LT |
1092 | if (v->dev==ptr) |
1093 | vif_delete(ct); | |
1094 | } | |
1095 | return NOTIFY_DONE; | |
1096 | } | |
1097 | ||
1098 | ||
1099 | static struct notifier_block ip_mr_notifier={ | |
1100 | .notifier_call = ipmr_device_event, | |
1101 | }; | |
1102 | ||
1103 | /* | |
1104 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1105 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1106 | * important for multicast video. | |
1107 | */ | |
e905a9ed | 1108 | |
114c7844 | 1109 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1110 | { |
8856dfa3 | 1111 | struct iphdr *iph; |
eddc9ec5 | 1112 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1113 | |
1114 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1115 | skb->transport_header = skb->network_header; |
8856dfa3 | 1116 | skb_reset_network_header(skb); |
eddc9ec5 | 1117 | iph = ip_hdr(skb); |
1da177e4 LT |
1118 | |
1119 | iph->version = 4; | |
e023dd64 ACM |
1120 | iph->tos = old_iph->tos; |
1121 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1122 | iph->frag_off = 0; |
1123 | iph->daddr = daddr; | |
1124 | iph->saddr = saddr; | |
1125 | iph->protocol = IPPROTO_IPIP; | |
1126 | iph->ihl = 5; | |
1127 | iph->tot_len = htons(skb->len); | |
1128 | ip_select_ident(iph, skb->dst, NULL); | |
1129 | ip_send_check(iph); | |
1130 | ||
1da177e4 LT |
1131 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1132 | nf_reset(skb); | |
1133 | } | |
1134 | ||
1135 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1136 | { | |
1137 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1138 | ||
1139 | IP_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
1140 | ||
1141 | if (unlikely(opt->optlen)) | |
1142 | ip_forward_options(skb); | |
1143 | ||
1144 | return dst_output(skb); | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * Processing handlers for ipmr_forward | |
1149 | */ | |
1150 | ||
1151 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1152 | { | |
eddc9ec5 | 1153 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1154 | struct vif_device *vif = &vif_table[vifi]; |
1155 | struct net_device *dev; | |
1156 | struct rtable *rt; | |
1157 | int encap = 0; | |
1158 | ||
1159 | if (vif->dev == NULL) | |
1160 | goto out_free; | |
1161 | ||
1162 | #ifdef CONFIG_IP_PIMSM | |
1163 | if (vif->flags & VIFF_REGISTER) { | |
1164 | vif->pkt_out++; | |
1165 | vif->bytes_out+=skb->len; | |
2941a486 PM |
1166 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_bytes += skb->len; |
1167 | ((struct net_device_stats*)netdev_priv(vif->dev))->tx_packets++; | |
1da177e4 LT |
1168 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
1169 | kfree_skb(skb); | |
1170 | return; | |
1171 | } | |
1172 | #endif | |
1173 | ||
1174 | if (vif->flags&VIFF_TUNNEL) { | |
1175 | struct flowi fl = { .oif = vif->link, | |
1176 | .nl_u = { .ip4_u = | |
1177 | { .daddr = vif->remote, | |
1178 | .saddr = vif->local, | |
1179 | .tos = RT_TOS(iph->tos) } }, | |
1180 | .proto = IPPROTO_IPIP }; | |
1181 | if (ip_route_output_key(&rt, &fl)) | |
1182 | goto out_free; | |
1183 | encap = sizeof(struct iphdr); | |
1184 | } else { | |
1185 | struct flowi fl = { .oif = vif->link, | |
1186 | .nl_u = { .ip4_u = | |
1187 | { .daddr = iph->daddr, | |
1188 | .tos = RT_TOS(iph->tos) } }, | |
1189 | .proto = IPPROTO_IPIP }; | |
1190 | if (ip_route_output_key(&rt, &fl)) | |
1191 | goto out_free; | |
1192 | } | |
1193 | ||
1194 | dev = rt->u.dst.dev; | |
1195 | ||
1196 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1197 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1198 | allow to send ICMP, so that packets will disappear | |
1199 | to blackhole. | |
1200 | */ | |
1201 | ||
1202 | IP_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
1203 | ip_rt_put(rt); | |
1204 | goto out_free; | |
1205 | } | |
1206 | ||
1207 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1208 | ||
1209 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1210 | ip_rt_put(rt); |
1da177e4 LT |
1211 | goto out_free; |
1212 | } | |
1213 | ||
1214 | vif->pkt_out++; | |
1215 | vif->bytes_out+=skb->len; | |
1216 | ||
1217 | dst_release(skb->dst); | |
1218 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1219 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1220 | |
1221 | /* FIXME: forward and output firewalls used to be called here. | |
1222 | * What do we do with netfilter? -- RR */ | |
1223 | if (vif->flags & VIFF_TUNNEL) { | |
1224 | ip_encap(skb, vif->local, vif->remote); | |
1225 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2941a486 PM |
1226 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_packets++; |
1227 | ((struct ip_tunnel *)netdev_priv(vif->dev))->stat.tx_bytes+=skb->len; | |
1da177e4 LT |
1228 | } |
1229 | ||
1230 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1231 | ||
1232 | /* | |
1233 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1234 | * not only before forwarding, but after forwarding on all output | |
1235 | * interfaces. It is clear, if mrouter runs a multicasting | |
1236 | * program, it should receive packets not depending to what interface | |
1237 | * program is joined. | |
1238 | * If we will not make it, the program will have to join on all | |
1239 | * interfaces. On the other hand, multihoming host (or router, but | |
1240 | * not mrouter) cannot join to more than one interface - it will | |
1241 | * result in receiving multiple packets. | |
1242 | */ | |
e905a9ed | 1243 | NF_HOOK(PF_INET, NF_IP_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1244 | ipmr_forward_finish); |
1245 | return; | |
1246 | ||
1247 | out_free: | |
1248 | kfree_skb(skb); | |
1249 | return; | |
1250 | } | |
1251 | ||
1252 | static int ipmr_find_vif(struct net_device *dev) | |
1253 | { | |
1254 | int ct; | |
1255 | for (ct=maxvif-1; ct>=0; ct--) { | |
1256 | if (vif_table[ct].dev == dev) | |
1257 | break; | |
1258 | } | |
1259 | return ct; | |
1260 | } | |
1261 | ||
1262 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1263 | ||
1264 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1265 | { | |
1266 | int psend = -1; | |
1267 | int vif, ct; | |
1268 | ||
1269 | vif = cache->mfc_parent; | |
1270 | cache->mfc_un.res.pkt++; | |
1271 | cache->mfc_un.res.bytes += skb->len; | |
1272 | ||
1273 | /* | |
1274 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1275 | */ | |
1276 | if (vif_table[vif].dev != skb->dev) { | |
1277 | int true_vifi; | |
1278 | ||
1279 | if (((struct rtable*)skb->dst)->fl.iif == 0) { | |
1280 | /* It is our own packet, looped back. | |
1281 | Very complicated situation... | |
1282 | ||
1283 | The best workaround until routing daemons will be | |
1284 | fixed is not to redistribute packet, if it was | |
1285 | send through wrong interface. It means, that | |
1286 | multicast applications WILL NOT work for | |
1287 | (S,G), which have default multicast route pointing | |
1288 | to wrong oif. In any case, it is not a good | |
1289 | idea to use multicasting applications on router. | |
1290 | */ | |
1291 | goto dont_forward; | |
1292 | } | |
1293 | ||
1294 | cache->mfc_un.res.wrong_if++; | |
1295 | true_vifi = ipmr_find_vif(skb->dev); | |
1296 | ||
1297 | if (true_vifi >= 0 && mroute_do_assert && | |
1298 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1299 | so that we cannot check that packet arrived on an oif. | |
1300 | It is bad, but otherwise we would need to move pretty | |
1301 | large chunk of pimd to kernel. Ough... --ANK | |
1302 | */ | |
1303 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
e905a9ed | 1304 | time_after(jiffies, |
1da177e4 LT |
1305 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1306 | cache->mfc_un.res.last_assert = jiffies; | |
1307 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1308 | } | |
1309 | goto dont_forward; | |
1310 | } | |
1311 | ||
1312 | vif_table[vif].pkt_in++; | |
1313 | vif_table[vif].bytes_in+=skb->len; | |
1314 | ||
1315 | /* | |
1316 | * Forward the frame | |
1317 | */ | |
1318 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1319 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1320 | if (psend != -1) { |
1321 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1322 | if (skb2) | |
1323 | ipmr_queue_xmit(skb2, cache, psend); | |
1324 | } | |
1325 | psend=ct; | |
1326 | } | |
1327 | } | |
1328 | if (psend != -1) { | |
1329 | if (local) { | |
1330 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1331 | if (skb2) | |
1332 | ipmr_queue_xmit(skb2, cache, psend); | |
1333 | } else { | |
1334 | ipmr_queue_xmit(skb, cache, psend); | |
1335 | return 0; | |
1336 | } | |
1337 | } | |
1338 | ||
1339 | dont_forward: | |
1340 | if (!local) | |
1341 | kfree_skb(skb); | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1345 | ||
1346 | /* | |
1347 | * Multicast packets for forwarding arrive here | |
1348 | */ | |
1349 | ||
1350 | int ip_mr_input(struct sk_buff *skb) | |
1351 | { | |
1352 | struct mfc_cache *cache; | |
1353 | int local = ((struct rtable*)skb->dst)->rt_flags&RTCF_LOCAL; | |
1354 | ||
1355 | /* Packet is looped back after forward, it should not be | |
1356 | forwarded second time, but still can be delivered locally. | |
1357 | */ | |
1358 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1359 | goto dont_forward; | |
1360 | ||
1361 | if (!local) { | |
1362 | if (IPCB(skb)->opt.router_alert) { | |
1363 | if (ip_call_ra_chain(skb)) | |
1364 | return 0; | |
eddc9ec5 | 1365 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1366 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1367 | Cisco IOS <= 11.2(8)) do not put router alert | |
1368 | option to IGMP packets destined to routable | |
1369 | groups. It is very bad, because it means | |
1370 | that we can forward NO IGMP messages. | |
1371 | */ | |
1372 | read_lock(&mrt_lock); | |
1373 | if (mroute_socket) { | |
2715bcf9 | 1374 | nf_reset(skb); |
1da177e4 LT |
1375 | raw_rcv(mroute_socket, skb); |
1376 | read_unlock(&mrt_lock); | |
1377 | return 0; | |
1378 | } | |
1379 | read_unlock(&mrt_lock); | |
1380 | } | |
1381 | } | |
1382 | ||
1383 | read_lock(&mrt_lock); | |
eddc9ec5 | 1384 | cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1385 | |
1386 | /* | |
1387 | * No usable cache entry | |
1388 | */ | |
1389 | if (cache==NULL) { | |
1390 | int vif; | |
1391 | ||
1392 | if (local) { | |
1393 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1394 | ip_local_deliver(skb); | |
1395 | if (skb2 == NULL) { | |
1396 | read_unlock(&mrt_lock); | |
1397 | return -ENOBUFS; | |
1398 | } | |
1399 | skb = skb2; | |
1400 | } | |
1401 | ||
1402 | vif = ipmr_find_vif(skb->dev); | |
1403 | if (vif >= 0) { | |
1404 | int err = ipmr_cache_unresolved(vif, skb); | |
1405 | read_unlock(&mrt_lock); | |
1406 | ||
1407 | return err; | |
1408 | } | |
1409 | read_unlock(&mrt_lock); | |
1410 | kfree_skb(skb); | |
1411 | return -ENODEV; | |
1412 | } | |
1413 | ||
1414 | ip_mr_forward(skb, cache, local); | |
1415 | ||
1416 | read_unlock(&mrt_lock); | |
1417 | ||
1418 | if (local) | |
1419 | return ip_local_deliver(skb); | |
1420 | ||
1421 | return 0; | |
1422 | ||
1423 | dont_forward: | |
1424 | if (local) | |
1425 | return ip_local_deliver(skb); | |
1426 | kfree_skb(skb); | |
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | #ifdef CONFIG_IP_PIMSM_V1 | |
1431 | /* | |
1432 | * Handle IGMP messages of PIMv1 | |
1433 | */ | |
1434 | ||
1435 | int pim_rcv_v1(struct sk_buff * skb) | |
1436 | { | |
1437 | struct igmphdr *pim; | |
1438 | struct iphdr *encap; | |
1439 | struct net_device *reg_dev = NULL; | |
1440 | ||
e905a9ed | 1441 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1442 | goto drop; |
1443 | ||
d9edf9e2 | 1444 | pim = igmp_hdr(skb); |
1da177e4 | 1445 | |
e905a9ed | 1446 | if (!mroute_do_pim || |
1da177e4 | 1447 | skb->len < sizeof(*pim) + sizeof(*encap) || |
e905a9ed | 1448 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1da177e4 LT |
1449 | goto drop; |
1450 | ||
9c70220b ACM |
1451 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1452 | sizeof(struct igmphdr)); | |
1da177e4 LT |
1453 | /* |
1454 | Check that: | |
1455 | a. packet is really destinted to a multicast group | |
1456 | b. packet is not a NULL-REGISTER | |
1457 | c. packet is not truncated | |
1458 | */ | |
1459 | if (!MULTICAST(encap->daddr) || | |
1460 | encap->tot_len == 0 || | |
e905a9ed | 1461 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1462 | goto drop; |
1463 | ||
1464 | read_lock(&mrt_lock); | |
1465 | if (reg_vif_num >= 0) | |
1466 | reg_dev = vif_table[reg_vif_num].dev; | |
1467 | if (reg_dev) | |
1468 | dev_hold(reg_dev); | |
1469 | read_unlock(&mrt_lock); | |
1470 | ||
e905a9ed | 1471 | if (reg_dev == NULL) |
1da177e4 LT |
1472 | goto drop; |
1473 | ||
b0e380b1 | 1474 | skb->mac_header = skb->network_header; |
1da177e4 | 1475 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1476 | skb_reset_network_header(skb); |
1da177e4 | 1477 | skb->dev = reg_dev; |
1da177e4 LT |
1478 | skb->protocol = htons(ETH_P_IP); |
1479 | skb->ip_summed = 0; | |
1480 | skb->pkt_type = PACKET_HOST; | |
1481 | dst_release(skb->dst); | |
1482 | skb->dst = NULL; | |
2941a486 PM |
1483 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
1484 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; | |
1da177e4 LT |
1485 | nf_reset(skb); |
1486 | netif_rx(skb); | |
1487 | dev_put(reg_dev); | |
1488 | return 0; | |
1489 | drop: | |
1490 | kfree_skb(skb); | |
1491 | return 0; | |
1492 | } | |
1493 | #endif | |
1494 | ||
1495 | #ifdef CONFIG_IP_PIMSM_V2 | |
1496 | static int pim_rcv(struct sk_buff * skb) | |
1497 | { | |
1498 | struct pimreghdr *pim; | |
1499 | struct iphdr *encap; | |
1500 | struct net_device *reg_dev = NULL; | |
1501 | ||
e905a9ed | 1502 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) |
1da177e4 LT |
1503 | goto drop; |
1504 | ||
9c70220b | 1505 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1506 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1507 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1508 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1509 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1510 | goto drop; |
1511 | ||
1512 | /* check if the inner packet is destined to mcast group */ | |
9c70220b ACM |
1513 | encap = (struct iphdr *)(skb_transport_header(skb) + |
1514 | sizeof(struct pimreghdr)); | |
1da177e4 LT |
1515 | if (!MULTICAST(encap->daddr) || |
1516 | encap->tot_len == 0 || | |
e905a9ed | 1517 | ntohs(encap->tot_len) + sizeof(*pim) > skb->len) |
1da177e4 LT |
1518 | goto drop; |
1519 | ||
1520 | read_lock(&mrt_lock); | |
1521 | if (reg_vif_num >= 0) | |
1522 | reg_dev = vif_table[reg_vif_num].dev; | |
1523 | if (reg_dev) | |
1524 | dev_hold(reg_dev); | |
1525 | read_unlock(&mrt_lock); | |
1526 | ||
e905a9ed | 1527 | if (reg_dev == NULL) |
1da177e4 LT |
1528 | goto drop; |
1529 | ||
b0e380b1 | 1530 | skb->mac_header = skb->network_header; |
1da177e4 | 1531 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1532 | skb_reset_network_header(skb); |
1da177e4 | 1533 | skb->dev = reg_dev; |
1da177e4 LT |
1534 | skb->protocol = htons(ETH_P_IP); |
1535 | skb->ip_summed = 0; | |
1536 | skb->pkt_type = PACKET_HOST; | |
1537 | dst_release(skb->dst); | |
2941a486 PM |
1538 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_bytes += skb->len; |
1539 | ((struct net_device_stats*)netdev_priv(reg_dev))->rx_packets++; | |
1da177e4 LT |
1540 | skb->dst = NULL; |
1541 | nf_reset(skb); | |
1542 | netif_rx(skb); | |
1543 | dev_put(reg_dev); | |
1544 | return 0; | |
1545 | drop: | |
1546 | kfree_skb(skb); | |
1547 | return 0; | |
1548 | } | |
1549 | #endif | |
1550 | ||
1551 | static int | |
1552 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1553 | { | |
1554 | int ct; | |
1555 | struct rtnexthop *nhp; | |
1556 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
27a884dc | 1557 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1558 | struct rtattr *mp_head; |
1559 | ||
1560 | if (dev) | |
1561 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1562 | ||
1563 | mp_head = (struct rtattr*)skb_put(skb, RTA_LENGTH(0)); | |
1564 | ||
1565 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1566 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1567 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1568 | goto rtattr_failure; | |
1569 | nhp = (struct rtnexthop*)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1570 | nhp->rtnh_flags = 0; | |
1571 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1572 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1573 | nhp->rtnh_len = sizeof(*nhp); | |
1574 | } | |
1575 | } | |
1576 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1577 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1578 | rtm->rtm_type = RTN_MULTICAST; |
1579 | return 1; | |
1580 | ||
1581 | rtattr_failure: | |
dc5fc579 | 1582 | nlmsg_trim(skb, b); |
1da177e4 LT |
1583 | return -EMSGSIZE; |
1584 | } | |
1585 | ||
1586 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1587 | { | |
1588 | int err; | |
1589 | struct mfc_cache *cache; | |
1590 | struct rtable *rt = (struct rtable*)skb->dst; | |
1591 | ||
1592 | read_lock(&mrt_lock); | |
1593 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1594 | ||
1595 | if (cache==NULL) { | |
72287490 | 1596 | struct sk_buff *skb2; |
eddc9ec5 | 1597 | struct iphdr *iph; |
1da177e4 LT |
1598 | struct net_device *dev; |
1599 | int vif; | |
1600 | ||
1601 | if (nowait) { | |
1602 | read_unlock(&mrt_lock); | |
1603 | return -EAGAIN; | |
1604 | } | |
1605 | ||
1606 | dev = skb->dev; | |
1607 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1608 | read_unlock(&mrt_lock); | |
1609 | return -ENODEV; | |
1610 | } | |
72287490 AK |
1611 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1612 | if (!skb2) { | |
1613 | read_unlock(&mrt_lock); | |
1614 | return -ENOMEM; | |
1615 | } | |
1616 | ||
e2d1bca7 ACM |
1617 | skb_push(skb2, sizeof(struct iphdr)); |
1618 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1619 | iph = ip_hdr(skb2); |
1620 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1621 | iph->saddr = rt->rt_src; | |
1622 | iph->daddr = rt->rt_dst; | |
1623 | iph->version = 0; | |
72287490 | 1624 | err = ipmr_cache_unresolved(vif, skb2); |
1da177e4 LT |
1625 | read_unlock(&mrt_lock); |
1626 | return err; | |
1627 | } | |
1628 | ||
1629 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1630 | cache->mfc_flags |= MFC_NOTIFY; | |
1631 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1632 | read_unlock(&mrt_lock); | |
1633 | return err; | |
1634 | } | |
1635 | ||
e905a9ed | 1636 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1637 | /* |
1638 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1639 | */ | |
1640 | struct ipmr_vif_iter { | |
1641 | int ct; | |
1642 | }; | |
1643 | ||
1644 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1645 | loff_t pos) | |
1646 | { | |
1647 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
132adf54 | 1648 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 | 1649 | continue; |
e905a9ed | 1650 | if (pos-- == 0) |
1da177e4 LT |
1651 | return &vif_table[iter->ct]; |
1652 | } | |
1653 | return NULL; | |
1654 | } | |
1655 | ||
1656 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
1657 | { | |
1658 | read_lock(&mrt_lock); | |
e905a9ed | 1659 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1660 | : SEQ_START_TOKEN; |
1661 | } | |
1662 | ||
1663 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1664 | { | |
1665 | struct ipmr_vif_iter *iter = seq->private; | |
1666 | ||
1667 | ++*pos; | |
1668 | if (v == SEQ_START_TOKEN) | |
1669 | return ipmr_vif_seq_idx(iter, 0); | |
e905a9ed | 1670 | |
1da177e4 | 1671 | while (++iter->ct < maxvif) { |
132adf54 | 1672 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 LT |
1673 | continue; |
1674 | return &vif_table[iter->ct]; | |
1675 | } | |
1676 | return NULL; | |
1677 | } | |
1678 | ||
1679 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
1680 | { | |
1681 | read_unlock(&mrt_lock); | |
1682 | } | |
1683 | ||
1684 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1685 | { | |
1686 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1687 | seq_puts(seq, |
1da177e4 LT |
1688 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1689 | } else { | |
1690 | const struct vif_device *vif = v; | |
1691 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1692 | ||
1693 | seq_printf(seq, | |
1694 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1695 | vif - vif_table, | |
e905a9ed | 1696 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1697 | vif->bytes_out, vif->pkt_out, |
1698 | vif->flags, vif->local, vif->remote); | |
1699 | } | |
1700 | return 0; | |
1701 | } | |
1702 | ||
f690808e | 1703 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1704 | .start = ipmr_vif_seq_start, |
1705 | .next = ipmr_vif_seq_next, | |
1706 | .stop = ipmr_vif_seq_stop, | |
1707 | .show = ipmr_vif_seq_show, | |
1708 | }; | |
1709 | ||
1710 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1711 | { | |
1712 | struct seq_file *seq; | |
1713 | int rc = -ENOMEM; | |
1714 | struct ipmr_vif_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e905a9ed | 1715 | |
1da177e4 LT |
1716 | if (!s) |
1717 | goto out; | |
1718 | ||
1719 | rc = seq_open(file, &ipmr_vif_seq_ops); | |
1720 | if (rc) | |
1721 | goto out_kfree; | |
1722 | ||
1723 | s->ct = 0; | |
1724 | seq = file->private_data; | |
1725 | seq->private = s; | |
1726 | out: | |
1727 | return rc; | |
1728 | out_kfree: | |
1729 | kfree(s); | |
1730 | goto out; | |
1731 | ||
1732 | } | |
1733 | ||
9a32144e | 1734 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1735 | .owner = THIS_MODULE, |
1736 | .open = ipmr_vif_open, | |
1737 | .read = seq_read, | |
1738 | .llseek = seq_lseek, | |
1739 | .release = seq_release_private, | |
1740 | }; | |
1741 | ||
1742 | struct ipmr_mfc_iter { | |
1743 | struct mfc_cache **cache; | |
1744 | int ct; | |
1745 | }; | |
1746 | ||
1747 | ||
1748 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1749 | { | |
1750 | struct mfc_cache *mfc; | |
1751 | ||
1752 | it->cache = mfc_cache_array; | |
1753 | read_lock(&mrt_lock); | |
e905a9ed | 1754 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
132adf54 | 1755 | for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) |
e905a9ed | 1756 | if (pos-- == 0) |
1da177e4 LT |
1757 | return mfc; |
1758 | read_unlock(&mrt_lock); | |
1759 | ||
1760 | it->cache = &mfc_unres_queue; | |
1761 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1762 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
1da177e4 LT |
1763 | if (pos-- == 0) |
1764 | return mfc; | |
1765 | spin_unlock_bh(&mfc_unres_lock); | |
1766 | ||
1767 | it->cache = NULL; | |
1768 | return NULL; | |
1769 | } | |
1770 | ||
1771 | ||
1772 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1773 | { | |
1774 | struct ipmr_mfc_iter *it = seq->private; | |
1775 | it->cache = NULL; | |
1776 | it->ct = 0; | |
e905a9ed | 1777 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1778 | : SEQ_START_TOKEN; |
1779 | } | |
1780 | ||
1781 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1782 | { | |
1783 | struct mfc_cache *mfc = v; | |
1784 | struct ipmr_mfc_iter *it = seq->private; | |
1785 | ||
1786 | ++*pos; | |
1787 | ||
1788 | if (v == SEQ_START_TOKEN) | |
1789 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1790 | ||
1791 | if (mfc->next) | |
1792 | return mfc->next; | |
e905a9ed YH |
1793 | |
1794 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1795 | goto end_of_list; |
1796 | ||
1797 | BUG_ON(it->cache != mfc_cache_array); | |
1798 | ||
1799 | while (++it->ct < MFC_LINES) { | |
1800 | mfc = mfc_cache_array[it->ct]; | |
1801 | if (mfc) | |
1802 | return mfc; | |
1803 | } | |
1804 | ||
1805 | /* exhausted cache_array, show unresolved */ | |
1806 | read_unlock(&mrt_lock); | |
1807 | it->cache = &mfc_unres_queue; | |
1808 | it->ct = 0; | |
e905a9ed | 1809 | |
1da177e4 LT |
1810 | spin_lock_bh(&mfc_unres_lock); |
1811 | mfc = mfc_unres_queue; | |
e905a9ed | 1812 | if (mfc) |
1da177e4 LT |
1813 | return mfc; |
1814 | ||
1815 | end_of_list: | |
1816 | spin_unlock_bh(&mfc_unres_lock); | |
1817 | it->cache = NULL; | |
1818 | ||
1819 | return NULL; | |
1820 | } | |
1821 | ||
1822 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1823 | { | |
1824 | struct ipmr_mfc_iter *it = seq->private; | |
1825 | ||
1826 | if (it->cache == &mfc_unres_queue) | |
1827 | spin_unlock_bh(&mfc_unres_lock); | |
1828 | else if (it->cache == mfc_cache_array) | |
1829 | read_unlock(&mrt_lock); | |
1830 | } | |
1831 | ||
1832 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1833 | { | |
1834 | int n; | |
1835 | ||
1836 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1837 | seq_puts(seq, |
1da177e4 LT |
1838 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1839 | } else { | |
1840 | const struct mfc_cache *mfc = v; | |
1841 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1842 | |
1da177e4 LT |
1843 | seq_printf(seq, "%08lX %08lX %-3d %8ld %8ld %8ld", |
1844 | (unsigned long) mfc->mfc_mcastgrp, | |
1845 | (unsigned long) mfc->mfc_origin, | |
1846 | mfc->mfc_parent, | |
1847 | mfc->mfc_un.res.pkt, | |
1848 | mfc->mfc_un.res.bytes, | |
1849 | mfc->mfc_un.res.wrong_if); | |
1850 | ||
1851 | if (it->cache != &mfc_unres_queue) { | |
132adf54 SH |
1852 | for (n = mfc->mfc_un.res.minvif; |
1853 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1854 | if (VIF_EXISTS(n) | |
1da177e4 | 1855 | && mfc->mfc_un.res.ttls[n] < 255) |
e905a9ed YH |
1856 | seq_printf(seq, |
1857 | " %2d:%-3d", | |
1da177e4 LT |
1858 | n, mfc->mfc_un.res.ttls[n]); |
1859 | } | |
1860 | } | |
1861 | seq_putc(seq, '\n'); | |
1862 | } | |
1863 | return 0; | |
1864 | } | |
1865 | ||
f690808e | 1866 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1867 | .start = ipmr_mfc_seq_start, |
1868 | .next = ipmr_mfc_seq_next, | |
1869 | .stop = ipmr_mfc_seq_stop, | |
1870 | .show = ipmr_mfc_seq_show, | |
1871 | }; | |
1872 | ||
1873 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1874 | { | |
1875 | struct seq_file *seq; | |
1876 | int rc = -ENOMEM; | |
1877 | struct ipmr_mfc_iter *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e905a9ed | 1878 | |
1da177e4 LT |
1879 | if (!s) |
1880 | goto out; | |
1881 | ||
1882 | rc = seq_open(file, &ipmr_mfc_seq_ops); | |
1883 | if (rc) | |
1884 | goto out_kfree; | |
1885 | ||
1886 | seq = file->private_data; | |
1887 | seq->private = s; | |
1888 | out: | |
1889 | return rc; | |
1890 | out_kfree: | |
1891 | kfree(s); | |
1892 | goto out; | |
1893 | ||
1894 | } | |
1895 | ||
9a32144e | 1896 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1897 | .owner = THIS_MODULE, |
1898 | .open = ipmr_mfc_open, | |
1899 | .read = seq_read, | |
1900 | .llseek = seq_lseek, | |
1901 | .release = seq_release_private, | |
1902 | }; | |
e905a9ed | 1903 | #endif |
1da177e4 LT |
1904 | |
1905 | #ifdef CONFIG_IP_PIMSM_V2 | |
1906 | static struct net_protocol pim_protocol = { | |
1907 | .handler = pim_rcv, | |
1908 | }; | |
1909 | #endif | |
1910 | ||
1911 | ||
1912 | /* | |
1913 | * Setup for IP multicast routing | |
1914 | */ | |
e905a9ed | 1915 | |
1da177e4 LT |
1916 | void __init ip_mr_init(void) |
1917 | { | |
1918 | mrt_cachep = kmem_cache_create("ip_mrt_cache", | |
1919 | sizeof(struct mfc_cache), | |
e5d679f3 | 1920 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 1921 | NULL); |
1da177e4 LT |
1922 | init_timer(&ipmr_expire_timer); |
1923 | ipmr_expire_timer.function=ipmr_expire_process; | |
1924 | register_netdevice_notifier(&ip_mr_notifier); | |
e905a9ed | 1925 | #ifdef CONFIG_PROC_FS |
457c4cbc EB |
1926 | proc_net_fops_create(&init_net, "ip_mr_vif", 0, &ipmr_vif_fops); |
1927 | proc_net_fops_create(&init_net, "ip_mr_cache", 0, &ipmr_mfc_fops); | |
e905a9ed | 1928 | #endif |
1da177e4 | 1929 | } |