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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
113aa838 | 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
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 | * | |
1da177e4 LT |
12 | * Fixes: |
13 | * Michael Chastain : Incorrect size of copying. | |
14 | * Alan Cox : Added the cache manager code | |
15 | * Alan Cox : Fixed the clone/copy bug and device race. | |
16 | * Mike McLagan : Routing by source | |
17 | * Malcolm Beattie : Buffer handling fixes. | |
18 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
19 | * SVR Anand : Fixed several multicast bugs and problems. | |
20 | * Alexey Kuznetsov : Status, optimisations and more. | |
21 | * Brad Parker : Better behaviour on mrouted upcall | |
22 | * overflow. | |
23 | * Carlos Picoto : PIMv1 Support | |
24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
25 | * Relax this requrement to work with older peers. | |
26 | * | |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <asm/system.h> |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/timer.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/fcntl.h> | |
38 | #include <linux/stat.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/inet.h> | |
42 | #include <linux/netdevice.h> | |
43 | #include <linux/inetdevice.h> | |
44 | #include <linux/igmp.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/mroute.h> | |
48 | #include <linux/init.h> | |
46f25dff | 49 | #include <linux/if_ether.h> |
457c4cbc | 50 | #include <net/net_namespace.h> |
1da177e4 LT |
51 | #include <net/ip.h> |
52 | #include <net/protocol.h> | |
53 | #include <linux/skbuff.h> | |
14c85021 | 54 | #include <net/route.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/icmp.h> | |
57 | #include <net/udp.h> | |
58 | #include <net/raw.h> | |
59 | #include <linux/notifier.h> | |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/netfilter_ipv4.h> | |
62 | #include <net/ipip.h> | |
63 | #include <net/checksum.h> | |
dc5fc579 | 64 | #include <net/netlink.h> |
1da177e4 LT |
65 | |
66 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
67 | #define CONFIG_IP_PIMSM 1 | |
68 | #endif | |
69 | ||
1da177e4 LT |
70 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
71 | Note that the changes are semaphored via rtnl_lock. | |
72 | */ | |
73 | ||
74 | static DEFINE_RWLOCK(mrt_lock); | |
75 | ||
76 | /* | |
77 | * Multicast router control variables | |
78 | */ | |
79 | ||
80 | static struct vif_device vif_table[MAXVIFS]; /* Devices */ | |
81 | static int maxvif; | |
82 | ||
83 | #define VIF_EXISTS(idx) (vif_table[idx].dev != NULL) | |
84 | ||
85 | static int mroute_do_assert; /* Set in PIM assert */ | |
86 | static int mroute_do_pim; | |
87 | ||
88 | static struct mfc_cache *mfc_cache_array[MFC_LINES]; /* Forwarding cache */ | |
89 | ||
90 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ | |
91 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ | |
92 | ||
93 | /* Special spinlock for queue of unresolved entries */ | |
94 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
95 | ||
96 | /* We return to original Alan's scheme. Hash table of resolved | |
97 | entries is changed only in process context and protected | |
98 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
99 | with strong spinlock mfc_unres_lock. | |
100 | ||
101 | In this case data path is free of exclusive locks at all. | |
102 | */ | |
103 | ||
e18b890b | 104 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
105 | |
106 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
107 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert); | |
108 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); | |
109 | ||
110 | #ifdef CONFIG_IP_PIMSM_V2 | |
111 | static struct net_protocol pim_protocol; | |
112 | #endif | |
113 | ||
114 | static struct timer_list ipmr_expire_timer; | |
115 | ||
116 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
117 | ||
d607032d WC |
118 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
119 | { | |
120 | dev_close(dev); | |
121 | ||
122 | dev = __dev_get_by_name(&init_net, "tunl0"); | |
123 | if (dev) { | |
5bc3eb7e | 124 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 125 | struct ifreq ifr; |
d607032d WC |
126 | struct ip_tunnel_parm p; |
127 | ||
128 | memset(&p, 0, sizeof(p)); | |
129 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
130 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
131 | p.iph.version = 4; | |
132 | p.iph.ihl = 5; | |
133 | p.iph.protocol = IPPROTO_IPIP; | |
134 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
135 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
136 | ||
5bc3eb7e SH |
137 | if (ops->ndo_do_ioctl) { |
138 | mm_segment_t oldfs = get_fs(); | |
139 | ||
140 | set_fs(KERNEL_DS); | |
141 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
142 | set_fs(oldfs); | |
143 | } | |
d607032d WC |
144 | } |
145 | } | |
146 | ||
1da177e4 LT |
147 | static |
148 | struct net_device *ipmr_new_tunnel(struct vifctl *v) | |
149 | { | |
150 | struct net_device *dev; | |
151 | ||
881d966b | 152 | dev = __dev_get_by_name(&init_net, "tunl0"); |
1da177e4 LT |
153 | |
154 | if (dev) { | |
5bc3eb7e | 155 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
156 | int err; |
157 | struct ifreq ifr; | |
1da177e4 LT |
158 | struct ip_tunnel_parm p; |
159 | struct in_device *in_dev; | |
160 | ||
161 | memset(&p, 0, sizeof(p)); | |
162 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
163 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
164 | p.iph.version = 4; | |
165 | p.iph.ihl = 5; | |
166 | p.iph.protocol = IPPROTO_IPIP; | |
167 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 168 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 169 | |
5bc3eb7e SH |
170 | if (ops->ndo_do_ioctl) { |
171 | mm_segment_t oldfs = get_fs(); | |
172 | ||
173 | set_fs(KERNEL_DS); | |
174 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
175 | set_fs(oldfs); | |
176 | } else | |
177 | err = -EOPNOTSUPP; | |
1da177e4 LT |
178 | |
179 | dev = NULL; | |
180 | ||
881d966b | 181 | if (err == 0 && (dev = __dev_get_by_name(&init_net, p.name)) != NULL) { |
1da177e4 LT |
182 | dev->flags |= IFF_MULTICAST; |
183 | ||
e5ed6399 | 184 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 185 | if (in_dev == NULL) |
1da177e4 | 186 | goto failure; |
71e27da9 HX |
187 | |
188 | ipv4_devconf_setall(in_dev); | |
189 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
190 | |
191 | if (dev_open(dev)) | |
192 | goto failure; | |
7dc00c82 | 193 | dev_hold(dev); |
1da177e4 LT |
194 | } |
195 | } | |
196 | return dev; | |
197 | ||
198 | failure: | |
199 | /* allow the register to be completed before unregistering. */ | |
200 | rtnl_unlock(); | |
201 | rtnl_lock(); | |
202 | ||
203 | unregister_netdevice(dev); | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | #ifdef CONFIG_IP_PIMSM | |
208 | ||
209 | static int reg_vif_num = -1; | |
210 | ||
211 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
212 | { | |
213 | read_lock(&mrt_lock); | |
cf3677ae PE |
214 | dev->stats.tx_bytes += skb->len; |
215 | dev->stats.tx_packets++; | |
1da177e4 LT |
216 | ipmr_cache_report(skb, reg_vif_num, IGMPMSG_WHOLEPKT); |
217 | read_unlock(&mrt_lock); | |
218 | kfree_skb(skb); | |
219 | return 0; | |
220 | } | |
221 | ||
007c3838 SH |
222 | static const struct net_device_ops reg_vif_netdev_ops = { |
223 | .ndo_start_xmit = reg_vif_xmit, | |
224 | }; | |
225 | ||
1da177e4 LT |
226 | static void reg_vif_setup(struct net_device *dev) |
227 | { | |
228 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 229 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 230 | dev->flags = IFF_NOARP; |
007c3838 | 231 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 LT |
232 | dev->destructor = free_netdev; |
233 | } | |
234 | ||
235 | static struct net_device *ipmr_reg_vif(void) | |
236 | { | |
237 | struct net_device *dev; | |
238 | struct in_device *in_dev; | |
239 | ||
cf3677ae | 240 | dev = alloc_netdev(0, "pimreg", reg_vif_setup); |
1da177e4 LT |
241 | |
242 | if (dev == NULL) | |
243 | return NULL; | |
244 | ||
245 | if (register_netdevice(dev)) { | |
246 | free_netdev(dev); | |
247 | return NULL; | |
248 | } | |
249 | dev->iflink = 0; | |
250 | ||
71e27da9 HX |
251 | rcu_read_lock(); |
252 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
253 | rcu_read_unlock(); | |
1da177e4 | 254 | goto failure; |
71e27da9 | 255 | } |
1da177e4 | 256 | |
71e27da9 HX |
257 | ipv4_devconf_setall(in_dev); |
258 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
259 | rcu_read_unlock(); | |
1da177e4 LT |
260 | |
261 | if (dev_open(dev)) | |
262 | goto failure; | |
263 | ||
7dc00c82 WC |
264 | dev_hold(dev); |
265 | ||
1da177e4 LT |
266 | return dev; |
267 | ||
268 | failure: | |
269 | /* allow the register to be completed before unregistering. */ | |
270 | rtnl_unlock(); | |
271 | rtnl_lock(); | |
272 | ||
273 | unregister_netdevice(dev); | |
274 | return NULL; | |
275 | } | |
276 | #endif | |
277 | ||
278 | /* | |
279 | * Delete a VIF entry | |
7dc00c82 | 280 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 281 | */ |
e905a9ed | 282 | |
7dc00c82 | 283 | static int vif_delete(int vifi, int notify) |
1da177e4 LT |
284 | { |
285 | struct vif_device *v; | |
286 | struct net_device *dev; | |
287 | struct in_device *in_dev; | |
288 | ||
289 | if (vifi < 0 || vifi >= maxvif) | |
290 | return -EADDRNOTAVAIL; | |
291 | ||
292 | v = &vif_table[vifi]; | |
293 | ||
294 | write_lock_bh(&mrt_lock); | |
295 | dev = v->dev; | |
296 | v->dev = NULL; | |
297 | ||
298 | if (!dev) { | |
299 | write_unlock_bh(&mrt_lock); | |
300 | return -EADDRNOTAVAIL; | |
301 | } | |
302 | ||
303 | #ifdef CONFIG_IP_PIMSM | |
304 | if (vifi == reg_vif_num) | |
305 | reg_vif_num = -1; | |
306 | #endif | |
307 | ||
308 | if (vifi+1 == maxvif) { | |
309 | int tmp; | |
310 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
311 | if (VIF_EXISTS(tmp)) | |
312 | break; | |
313 | } | |
314 | maxvif = tmp+1; | |
315 | } | |
316 | ||
317 | write_unlock_bh(&mrt_lock); | |
318 | ||
319 | dev_set_allmulti(dev, -1); | |
320 | ||
e5ed6399 | 321 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 322 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
323 | ip_rt_multicast_event(in_dev); |
324 | } | |
325 | ||
7dc00c82 | 326 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
1da177e4 LT |
327 | unregister_netdevice(dev); |
328 | ||
329 | dev_put(dev); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* Destroy an unresolved cache entry, killing queued skbs | |
334 | and reporting error to netlink readers. | |
335 | */ | |
336 | ||
337 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
338 | { | |
339 | struct sk_buff *skb; | |
9ef1d4c7 | 340 | struct nlmsgerr *e; |
1da177e4 LT |
341 | |
342 | atomic_dec(&cache_resolve_queue_len); | |
343 | ||
c354e124 | 344 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 345 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
346 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
347 | nlh->nlmsg_type = NLMSG_ERROR; | |
348 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
349 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
350 | e = NLMSG_DATA(nlh); |
351 | e->error = -ETIMEDOUT; | |
352 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 353 | |
97c53cac | 354 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
1da177e4 LT |
355 | } else |
356 | kfree_skb(skb); | |
357 | } | |
358 | ||
359 | kmem_cache_free(mrt_cachep, c); | |
360 | } | |
361 | ||
362 | ||
363 | /* Single timer process for all the unresolved queue. */ | |
364 | ||
365 | static void ipmr_expire_process(unsigned long dummy) | |
366 | { | |
367 | unsigned long now; | |
368 | unsigned long expires; | |
369 | struct mfc_cache *c, **cp; | |
370 | ||
371 | if (!spin_trylock(&mfc_unres_lock)) { | |
372 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
373 | return; | |
374 | } | |
375 | ||
376 | if (atomic_read(&cache_resolve_queue_len) == 0) | |
377 | goto out; | |
378 | ||
379 | now = jiffies; | |
380 | expires = 10*HZ; | |
381 | cp = &mfc_unres_queue; | |
382 | ||
383 | while ((c=*cp) != NULL) { | |
384 | if (time_after(c->mfc_un.unres.expires, now)) { | |
385 | unsigned long interval = c->mfc_un.unres.expires - now; | |
386 | if (interval < expires) | |
387 | expires = interval; | |
388 | cp = &c->next; | |
389 | continue; | |
390 | } | |
391 | ||
392 | *cp = c->next; | |
393 | ||
394 | ipmr_destroy_unres(c); | |
395 | } | |
396 | ||
397 | if (atomic_read(&cache_resolve_queue_len)) | |
398 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
399 | ||
400 | out: | |
401 | spin_unlock(&mfc_unres_lock); | |
402 | } | |
403 | ||
404 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
405 | ||
d1b04c08 | 406 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
407 | { |
408 | int vifi; | |
409 | ||
410 | cache->mfc_un.res.minvif = MAXVIFS; | |
411 | cache->mfc_un.res.maxvif = 0; | |
412 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
413 | ||
414 | for (vifi=0; vifi<maxvif; vifi++) { | |
415 | if (VIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
416 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
417 | if (cache->mfc_un.res.minvif > vifi) | |
418 | cache->mfc_un.res.minvif = vifi; | |
419 | if (cache->mfc_un.res.maxvif <= vifi) | |
420 | cache->mfc_un.res.maxvif = vifi + 1; | |
421 | } | |
422 | } | |
423 | } | |
424 | ||
425 | static int vif_add(struct vifctl *vifc, int mrtsock) | |
426 | { | |
427 | int vifi = vifc->vifc_vifi; | |
428 | struct vif_device *v = &vif_table[vifi]; | |
429 | struct net_device *dev; | |
430 | struct in_device *in_dev; | |
d607032d | 431 | int err; |
1da177e4 LT |
432 | |
433 | /* Is vif busy ? */ | |
434 | if (VIF_EXISTS(vifi)) | |
435 | return -EADDRINUSE; | |
436 | ||
437 | switch (vifc->vifc_flags) { | |
438 | #ifdef CONFIG_IP_PIMSM | |
439 | case VIFF_REGISTER: | |
440 | /* | |
441 | * Special Purpose VIF in PIM | |
442 | * All the packets will be sent to the daemon | |
443 | */ | |
444 | if (reg_vif_num >= 0) | |
445 | return -EADDRINUSE; | |
446 | dev = ipmr_reg_vif(); | |
447 | if (!dev) | |
448 | return -ENOBUFS; | |
d607032d WC |
449 | err = dev_set_allmulti(dev, 1); |
450 | if (err) { | |
451 | unregister_netdevice(dev); | |
7dc00c82 | 452 | dev_put(dev); |
d607032d WC |
453 | return err; |
454 | } | |
1da177e4 LT |
455 | break; |
456 | #endif | |
e905a9ed | 457 | case VIFF_TUNNEL: |
1da177e4 LT |
458 | dev = ipmr_new_tunnel(vifc); |
459 | if (!dev) | |
460 | return -ENOBUFS; | |
d607032d WC |
461 | err = dev_set_allmulti(dev, 1); |
462 | if (err) { | |
463 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 464 | dev_put(dev); |
d607032d WC |
465 | return err; |
466 | } | |
1da177e4 LT |
467 | break; |
468 | case 0: | |
1ab35276 | 469 | dev = ip_dev_find(&init_net, vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
470 | if (!dev) |
471 | return -EADDRNOTAVAIL; | |
d607032d | 472 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
473 | if (err) { |
474 | dev_put(dev); | |
d607032d | 475 | return err; |
7dc00c82 | 476 | } |
1da177e4 LT |
477 | break; |
478 | default: | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
e5ed6399 | 482 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 | 483 | return -EADDRNOTAVAIL; |
42f811b8 | 484 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
485 | ip_rt_multicast_event(in_dev); |
486 | ||
487 | /* | |
488 | * Fill in the VIF structures | |
489 | */ | |
c354e124 JK |
490 | v->rate_limit = vifc->vifc_rate_limit; |
491 | v->local = vifc->vifc_lcl_addr.s_addr; | |
492 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
493 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
494 | if (!mrtsock) |
495 | v->flags |= VIFF_STATIC; | |
c354e124 | 496 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
497 | v->bytes_in = 0; |
498 | v->bytes_out = 0; | |
499 | v->pkt_in = 0; | |
500 | v->pkt_out = 0; | |
501 | v->link = dev->ifindex; | |
502 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
503 | v->link = dev->iflink; | |
504 | ||
505 | /* And finish update writing critical data */ | |
506 | write_lock_bh(&mrt_lock); | |
c354e124 | 507 | v->dev = dev; |
1da177e4 LT |
508 | #ifdef CONFIG_IP_PIMSM |
509 | if (v->flags&VIFF_REGISTER) | |
510 | reg_vif_num = vifi; | |
511 | #endif | |
512 | if (vifi+1 > maxvif) | |
513 | maxvif = vifi+1; | |
514 | write_unlock_bh(&mrt_lock); | |
515 | return 0; | |
516 | } | |
517 | ||
114c7844 | 518 | static struct mfc_cache *ipmr_cache_find(__be32 origin, __be32 mcastgrp) |
1da177e4 | 519 | { |
c354e124 | 520 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
521 | struct mfc_cache *c; |
522 | ||
523 | for (c=mfc_cache_array[line]; c; c = c->next) { | |
524 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) | |
525 | break; | |
526 | } | |
527 | return c; | |
528 | } | |
529 | ||
530 | /* | |
531 | * Allocate a multicast cache entry | |
532 | */ | |
533 | static struct mfc_cache *ipmr_cache_alloc(void) | |
534 | { | |
c354e124 JK |
535 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
536 | if (c == NULL) | |
1da177e4 | 537 | return NULL; |
1da177e4 LT |
538 | c->mfc_un.res.minvif = MAXVIFS; |
539 | return c; | |
540 | } | |
541 | ||
542 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
543 | { | |
c354e124 JK |
544 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
545 | if (c == NULL) | |
1da177e4 | 546 | return NULL; |
1da177e4 LT |
547 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
548 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
549 | return c; | |
550 | } | |
551 | ||
552 | /* | |
553 | * A cache entry has gone into a resolved state from queued | |
554 | */ | |
e905a9ed | 555 | |
1da177e4 LT |
556 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
557 | { | |
558 | struct sk_buff *skb; | |
9ef1d4c7 | 559 | struct nlmsgerr *e; |
1da177e4 LT |
560 | |
561 | /* | |
562 | * Play the pending entries through our router | |
563 | */ | |
564 | ||
c354e124 | 565 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 566 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
567 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
568 | ||
569 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
570 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
571 | (u8 *)nlh); | |
1da177e4 LT |
572 | } else { |
573 | nlh->nlmsg_type = NLMSG_ERROR; | |
574 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
575 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
576 | e = NLMSG_DATA(nlh); |
577 | e->error = -EMSGSIZE; | |
578 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 579 | } |
2942e900 | 580 | |
97c53cac | 581 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); |
1da177e4 LT |
582 | } else |
583 | ip_mr_forward(skb, c, 0); | |
584 | } | |
585 | } | |
586 | ||
587 | /* | |
588 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
589 | * expects the following bizarre scheme. | |
590 | * | |
591 | * Called under mrt_lock. | |
592 | */ | |
e905a9ed | 593 | |
1da177e4 LT |
594 | static int ipmr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert) |
595 | { | |
596 | struct sk_buff *skb; | |
c9bdd4b5 | 597 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
598 | struct igmphdr *igmp; |
599 | struct igmpmsg *msg; | |
600 | int ret; | |
601 | ||
602 | #ifdef CONFIG_IP_PIMSM | |
603 | if (assert == IGMPMSG_WHOLEPKT) | |
604 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
605 | else | |
606 | #endif | |
607 | skb = alloc_skb(128, GFP_ATOMIC); | |
608 | ||
132adf54 | 609 | if (!skb) |
1da177e4 LT |
610 | return -ENOBUFS; |
611 | ||
612 | #ifdef CONFIG_IP_PIMSM | |
613 | if (assert == IGMPMSG_WHOLEPKT) { | |
614 | /* Ugly, but we have no choice with this interface. | |
615 | Duplicate old header, fix ihl, length etc. | |
616 | And all this only to mangle msg->im_msgtype and | |
617 | to set msg->im_mbz to "mbz" :-) | |
618 | */ | |
878c8145 ACM |
619 | skb_push(skb, sizeof(struct iphdr)); |
620 | skb_reset_network_header(skb); | |
badff6d0 | 621 | skb_reset_transport_header(skb); |
0272ffc4 | 622 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 623 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
624 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
625 | msg->im_mbz = 0; | |
e905a9ed | 626 | msg->im_vif = reg_vif_num; |
eddc9ec5 ACM |
627 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
628 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
629 | sizeof(struct iphdr)); | |
e905a9ed | 630 | } else |
1da177e4 | 631 | #endif |
e905a9ed YH |
632 | { |
633 | ||
1da177e4 LT |
634 | /* |
635 | * Copy the IP header | |
636 | */ | |
637 | ||
27a884dc | 638 | skb->network_header = skb->tail; |
ddc7b8e3 | 639 | skb_put(skb, ihl); |
27d7ff46 | 640 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
641 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
642 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
643 | msg->im_vif = vifi; |
644 | skb->dst = dst_clone(pkt->dst); | |
645 | ||
646 | /* | |
647 | * Add our header | |
648 | */ | |
649 | ||
c354e124 | 650 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
651 | igmp->type = |
652 | msg->im_msgtype = assert; | |
653 | igmp->code = 0; | |
eddc9ec5 | 654 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 655 | skb->transport_header = skb->network_header; |
e905a9ed | 656 | } |
1da177e4 | 657 | |
70a269e6 | 658 | if (init_net.ipv4.mroute_sk == NULL) { |
1da177e4 LT |
659 | kfree_skb(skb); |
660 | return -EINVAL; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Deliver to mrouted | |
665 | */ | |
70a269e6 BT |
666 | ret = sock_queue_rcv_skb(init_net.ipv4.mroute_sk, skb); |
667 | if (ret < 0) { | |
1da177e4 LT |
668 | if (net_ratelimit()) |
669 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
670 | kfree_skb(skb); | |
671 | } | |
672 | ||
673 | return ret; | |
674 | } | |
675 | ||
676 | /* | |
677 | * Queue a packet for resolution. It gets locked cache entry! | |
678 | */ | |
e905a9ed | 679 | |
1da177e4 LT |
680 | static int |
681 | ipmr_cache_unresolved(vifi_t vifi, struct sk_buff *skb) | |
682 | { | |
683 | int err; | |
684 | struct mfc_cache *c; | |
eddc9ec5 | 685 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
686 | |
687 | spin_lock_bh(&mfc_unres_lock); | |
688 | for (c=mfc_unres_queue; c; c=c->next) { | |
eddc9ec5 ACM |
689 | if (c->mfc_mcastgrp == iph->daddr && |
690 | c->mfc_origin == iph->saddr) | |
1da177e4 LT |
691 | break; |
692 | } | |
693 | ||
694 | if (c == NULL) { | |
695 | /* | |
696 | * Create a new entry if allowable | |
697 | */ | |
698 | ||
c354e124 | 699 | if (atomic_read(&cache_resolve_queue_len) >= 10 || |
1da177e4 LT |
700 | (c=ipmr_cache_alloc_unres())==NULL) { |
701 | spin_unlock_bh(&mfc_unres_lock); | |
702 | ||
703 | kfree_skb(skb); | |
704 | return -ENOBUFS; | |
705 | } | |
706 | ||
707 | /* | |
708 | * Fill in the new cache entry | |
709 | */ | |
eddc9ec5 ACM |
710 | c->mfc_parent = -1; |
711 | c->mfc_origin = iph->saddr; | |
712 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
713 | |
714 | /* | |
715 | * Reflect first query at mrouted. | |
716 | */ | |
717 | if ((err = ipmr_cache_report(skb, vifi, IGMPMSG_NOCACHE))<0) { | |
e905a9ed | 718 | /* If the report failed throw the cache entry |
1da177e4 LT |
719 | out - Brad Parker |
720 | */ | |
721 | spin_unlock_bh(&mfc_unres_lock); | |
722 | ||
723 | kmem_cache_free(mrt_cachep, c); | |
724 | kfree_skb(skb); | |
725 | return err; | |
726 | } | |
727 | ||
728 | atomic_inc(&cache_resolve_queue_len); | |
729 | c->next = mfc_unres_queue; | |
730 | mfc_unres_queue = c; | |
731 | ||
732 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
733 | } | |
734 | ||
735 | /* | |
736 | * See if we can append the packet | |
737 | */ | |
738 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
739 | kfree_skb(skb); | |
740 | err = -ENOBUFS; | |
741 | } else { | |
c354e124 | 742 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
743 | err = 0; |
744 | } | |
745 | ||
746 | spin_unlock_bh(&mfc_unres_lock); | |
747 | return err; | |
748 | } | |
749 | ||
750 | /* | |
751 | * MFC cache manipulation by user space mroute daemon | |
752 | */ | |
753 | ||
754 | static int ipmr_mfc_delete(struct mfcctl *mfc) | |
755 | { | |
756 | int line; | |
757 | struct mfc_cache *c, **cp; | |
758 | ||
c354e124 | 759 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 LT |
760 | |
761 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
762 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
763 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
764 | write_lock_bh(&mrt_lock); | |
765 | *cp = c->next; | |
766 | write_unlock_bh(&mrt_lock); | |
767 | ||
768 | kmem_cache_free(mrt_cachep, c); | |
769 | return 0; | |
770 | } | |
771 | } | |
772 | return -ENOENT; | |
773 | } | |
774 | ||
775 | static int ipmr_mfc_add(struct mfcctl *mfc, int mrtsock) | |
776 | { | |
777 | int line; | |
778 | struct mfc_cache *uc, *c, **cp; | |
779 | ||
c354e124 | 780 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 LT |
781 | |
782 | for (cp=&mfc_cache_array[line]; (c=*cp) != NULL; cp = &c->next) { | |
783 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
784 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
785 | break; | |
786 | } | |
787 | ||
788 | if (c != NULL) { | |
789 | write_lock_bh(&mrt_lock); | |
790 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 791 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
792 | if (!mrtsock) |
793 | c->mfc_flags |= MFC_STATIC; | |
794 | write_unlock_bh(&mrt_lock); | |
795 | return 0; | |
796 | } | |
797 | ||
f97c1e0c | 798 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
799 | return -EINVAL; |
800 | ||
c354e124 JK |
801 | c = ipmr_cache_alloc(); |
802 | if (c == NULL) | |
1da177e4 LT |
803 | return -ENOMEM; |
804 | ||
c354e124 JK |
805 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
806 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
807 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 808 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
809 | if (!mrtsock) |
810 | c->mfc_flags |= MFC_STATIC; | |
811 | ||
812 | write_lock_bh(&mrt_lock); | |
813 | c->next = mfc_cache_array[line]; | |
814 | mfc_cache_array[line] = c; | |
815 | write_unlock_bh(&mrt_lock); | |
816 | ||
817 | /* | |
818 | * Check to see if we resolved a queued list. If so we | |
819 | * need to send on the frames and tidy up. | |
820 | */ | |
821 | spin_lock_bh(&mfc_unres_lock); | |
822 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
823 | cp = &uc->next) { | |
824 | if (uc->mfc_origin == c->mfc_origin && | |
825 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
826 | *cp = uc->next; | |
827 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
828 | del_timer(&ipmr_expire_timer); | |
829 | break; | |
830 | } | |
831 | } | |
832 | spin_unlock_bh(&mfc_unres_lock); | |
833 | ||
834 | if (uc) { | |
835 | ipmr_cache_resolve(uc, c); | |
836 | kmem_cache_free(mrt_cachep, uc); | |
837 | } | |
838 | return 0; | |
839 | } | |
840 | ||
841 | /* | |
842 | * Close the multicast socket, and clear the vif tables etc | |
843 | */ | |
e905a9ed | 844 | |
1da177e4 LT |
845 | static void mroute_clean_tables(struct sock *sk) |
846 | { | |
847 | int i; | |
e905a9ed | 848 | |
1da177e4 LT |
849 | /* |
850 | * Shut down all active vif entries | |
851 | */ | |
132adf54 | 852 | for (i=0; i<maxvif; i++) { |
1da177e4 | 853 | if (!(vif_table[i].flags&VIFF_STATIC)) |
7dc00c82 | 854 | vif_delete(i, 0); |
1da177e4 LT |
855 | } |
856 | ||
857 | /* | |
858 | * Wipe the cache | |
859 | */ | |
c354e124 | 860 | for (i=0; i<MFC_LINES; i++) { |
1da177e4 LT |
861 | struct mfc_cache *c, **cp; |
862 | ||
863 | cp = &mfc_cache_array[i]; | |
864 | while ((c = *cp) != NULL) { | |
865 | if (c->mfc_flags&MFC_STATIC) { | |
866 | cp = &c->next; | |
867 | continue; | |
868 | } | |
869 | write_lock_bh(&mrt_lock); | |
870 | *cp = c->next; | |
871 | write_unlock_bh(&mrt_lock); | |
872 | ||
873 | kmem_cache_free(mrt_cachep, c); | |
874 | } | |
875 | } | |
876 | ||
877 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
878 | struct mfc_cache *c; | |
879 | ||
880 | spin_lock_bh(&mfc_unres_lock); | |
881 | while (mfc_unres_queue != NULL) { | |
882 | c = mfc_unres_queue; | |
883 | mfc_unres_queue = c->next; | |
884 | spin_unlock_bh(&mfc_unres_lock); | |
885 | ||
886 | ipmr_destroy_unres(c); | |
887 | ||
888 | spin_lock_bh(&mfc_unres_lock); | |
889 | } | |
890 | spin_unlock_bh(&mfc_unres_lock); | |
891 | } | |
892 | } | |
893 | ||
894 | static void mrtsock_destruct(struct sock *sk) | |
895 | { | |
896 | rtnl_lock(); | |
70a269e6 | 897 | if (sk == init_net.ipv4.mroute_sk) { |
3b1e0a65 | 898 | IPV4_DEVCONF_ALL(sock_net(sk), MC_FORWARDING)--; |
1da177e4 LT |
899 | |
900 | write_lock_bh(&mrt_lock); | |
70a269e6 | 901 | init_net.ipv4.mroute_sk = NULL; |
1da177e4 LT |
902 | write_unlock_bh(&mrt_lock); |
903 | ||
904 | mroute_clean_tables(sk); | |
905 | } | |
906 | rtnl_unlock(); | |
907 | } | |
908 | ||
909 | /* | |
910 | * Socket options and virtual interface manipulation. The whole | |
911 | * virtual interface system is a complete heap, but unfortunately | |
912 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
913 | * MOSPF/PIM router set up we can clean this up. | |
914 | */ | |
e905a9ed | 915 | |
c354e124 | 916 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) |
1da177e4 LT |
917 | { |
918 | int ret; | |
919 | struct vifctl vif; | |
920 | struct mfcctl mfc; | |
e905a9ed | 921 | |
132adf54 | 922 | if (optname != MRT_INIT) { |
70a269e6 | 923 | if (sk != init_net.ipv4.mroute_sk && !capable(CAP_NET_ADMIN)) |
1da177e4 LT |
924 | return -EACCES; |
925 | } | |
926 | ||
132adf54 SH |
927 | switch (optname) { |
928 | case MRT_INIT: | |
929 | if (sk->sk_type != SOCK_RAW || | |
930 | inet_sk(sk)->num != IPPROTO_IGMP) | |
931 | return -EOPNOTSUPP; | |
c354e124 | 932 | if (optlen != sizeof(int)) |
132adf54 | 933 | return -ENOPROTOOPT; |
1da177e4 | 934 | |
132adf54 | 935 | rtnl_lock(); |
70a269e6 | 936 | if (init_net.ipv4.mroute_sk) { |
1da177e4 | 937 | rtnl_unlock(); |
132adf54 SH |
938 | return -EADDRINUSE; |
939 | } | |
940 | ||
941 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
942 | if (ret == 0) { | |
943 | write_lock_bh(&mrt_lock); | |
70a269e6 | 944 | init_net.ipv4.mroute_sk = sk; |
132adf54 SH |
945 | write_unlock_bh(&mrt_lock); |
946 | ||
3b1e0a65 | 947 | IPV4_DEVCONF_ALL(sock_net(sk), MC_FORWARDING)++; |
132adf54 SH |
948 | } |
949 | rtnl_unlock(); | |
950 | return ret; | |
951 | case MRT_DONE: | |
70a269e6 | 952 | if (sk != init_net.ipv4.mroute_sk) |
132adf54 SH |
953 | return -EACCES; |
954 | return ip_ra_control(sk, 0, NULL); | |
955 | case MRT_ADD_VIF: | |
956 | case MRT_DEL_VIF: | |
c354e124 | 957 | if (optlen != sizeof(vif)) |
132adf54 | 958 | return -EINVAL; |
c354e124 | 959 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
960 | return -EFAULT; |
961 | if (vif.vifc_vifi >= MAXVIFS) | |
962 | return -ENFILE; | |
963 | rtnl_lock(); | |
c354e124 | 964 | if (optname == MRT_ADD_VIF) { |
70a269e6 | 965 | ret = vif_add(&vif, sk == init_net.ipv4.mroute_sk); |
132adf54 | 966 | } else { |
7dc00c82 | 967 | ret = vif_delete(vif.vifc_vifi, 0); |
132adf54 SH |
968 | } |
969 | rtnl_unlock(); | |
970 | return ret; | |
1da177e4 LT |
971 | |
972 | /* | |
973 | * Manipulate the forwarding caches. These live | |
974 | * in a sort of kernel/user symbiosis. | |
975 | */ | |
132adf54 SH |
976 | case MRT_ADD_MFC: |
977 | case MRT_DEL_MFC: | |
c354e124 | 978 | if (optlen != sizeof(mfc)) |
132adf54 | 979 | return -EINVAL; |
c354e124 | 980 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
981 | return -EFAULT; |
982 | rtnl_lock(); | |
c354e124 | 983 | if (optname == MRT_DEL_MFC) |
132adf54 SH |
984 | ret = ipmr_mfc_delete(&mfc); |
985 | else | |
70a269e6 | 986 | ret = ipmr_mfc_add(&mfc, sk == init_net.ipv4.mroute_sk); |
132adf54 SH |
987 | rtnl_unlock(); |
988 | return ret; | |
1da177e4 LT |
989 | /* |
990 | * Control PIM assert. | |
991 | */ | |
132adf54 SH |
992 | case MRT_ASSERT: |
993 | { | |
994 | int v; | |
995 | if (get_user(v,(int __user *)optval)) | |
996 | return -EFAULT; | |
997 | mroute_do_assert=(v)?1:0; | |
998 | return 0; | |
999 | } | |
1da177e4 | 1000 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1001 | case MRT_PIM: |
1002 | { | |
ba93ef74 SH |
1003 | int v; |
1004 | ||
132adf54 SH |
1005 | if (get_user(v,(int __user *)optval)) |
1006 | return -EFAULT; | |
ba93ef74 SH |
1007 | v = (v) ? 1 : 0; |
1008 | ||
132adf54 SH |
1009 | rtnl_lock(); |
1010 | ret = 0; | |
1011 | if (v != mroute_do_pim) { | |
1012 | mroute_do_pim = v; | |
1013 | mroute_do_assert = v; | |
1da177e4 | 1014 | #ifdef CONFIG_IP_PIMSM_V2 |
132adf54 SH |
1015 | if (mroute_do_pim) |
1016 | ret = inet_add_protocol(&pim_protocol, | |
1017 | IPPROTO_PIM); | |
1018 | else | |
1019 | ret = inet_del_protocol(&pim_protocol, | |
1020 | IPPROTO_PIM); | |
1021 | if (ret < 0) | |
1022 | ret = -EAGAIN; | |
1da177e4 | 1023 | #endif |
1da177e4 | 1024 | } |
132adf54 SH |
1025 | rtnl_unlock(); |
1026 | return ret; | |
1027 | } | |
1da177e4 | 1028 | #endif |
132adf54 SH |
1029 | /* |
1030 | * Spurious command, or MRT_VERSION which you cannot | |
1031 | * set. | |
1032 | */ | |
1033 | default: | |
1034 | return -ENOPROTOOPT; | |
1da177e4 LT |
1035 | } |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Getsock opt support for the multicast routing system. | |
1040 | */ | |
e905a9ed | 1041 | |
c354e124 | 1042 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1043 | { |
1044 | int olr; | |
1045 | int val; | |
1046 | ||
c354e124 | 1047 | if (optname != MRT_VERSION && |
1da177e4 LT |
1048 | #ifdef CONFIG_IP_PIMSM |
1049 | optname!=MRT_PIM && | |
1050 | #endif | |
1051 | optname!=MRT_ASSERT) | |
1052 | return -ENOPROTOOPT; | |
1053 | ||
1054 | if (get_user(olr, optlen)) | |
1055 | return -EFAULT; | |
1056 | ||
1057 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1058 | if (olr < 0) | |
1059 | return -EINVAL; | |
e905a9ed | 1060 | |
c354e124 | 1061 | if (put_user(olr, optlen)) |
1da177e4 | 1062 | return -EFAULT; |
c354e124 JK |
1063 | if (optname == MRT_VERSION) |
1064 | val = 0x0305; | |
1da177e4 | 1065 | #ifdef CONFIG_IP_PIMSM |
c354e124 JK |
1066 | else if (optname == MRT_PIM) |
1067 | val = mroute_do_pim; | |
1da177e4 LT |
1068 | #endif |
1069 | else | |
c354e124 JK |
1070 | val = mroute_do_assert; |
1071 | if (copy_to_user(optval, &val, olr)) | |
1da177e4 LT |
1072 | return -EFAULT; |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * The IP multicast ioctl support routines. | |
1078 | */ | |
e905a9ed | 1079 | |
1da177e4 LT |
1080 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1081 | { | |
1082 | struct sioc_sg_req sr; | |
1083 | struct sioc_vif_req vr; | |
1084 | struct vif_device *vif; | |
1085 | struct mfc_cache *c; | |
e905a9ed | 1086 | |
132adf54 SH |
1087 | switch (cmd) { |
1088 | case SIOCGETVIFCNT: | |
c354e124 | 1089 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1090 | return -EFAULT; |
c354e124 | 1091 | if (vr.vifi >= maxvif) |
132adf54 SH |
1092 | return -EINVAL; |
1093 | read_lock(&mrt_lock); | |
1094 | vif=&vif_table[vr.vifi]; | |
1095 | if (VIF_EXISTS(vr.vifi)) { | |
c354e124 JK |
1096 | vr.icount = vif->pkt_in; |
1097 | vr.ocount = vif->pkt_out; | |
1098 | vr.ibytes = vif->bytes_in; | |
1099 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1100 | read_unlock(&mrt_lock); |
1da177e4 | 1101 | |
c354e124 | 1102 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1103 | return -EFAULT; |
1104 | return 0; | |
1105 | } | |
1106 | read_unlock(&mrt_lock); | |
1107 | return -EADDRNOTAVAIL; | |
1108 | case SIOCGETSGCNT: | |
c354e124 | 1109 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1110 | return -EFAULT; |
1111 | ||
1112 | read_lock(&mrt_lock); | |
1113 | c = ipmr_cache_find(sr.src.s_addr, sr.grp.s_addr); | |
1114 | if (c) { | |
1115 | sr.pktcnt = c->mfc_un.res.pkt; | |
1116 | sr.bytecnt = c->mfc_un.res.bytes; | |
1117 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1118 | read_unlock(&mrt_lock); |
132adf54 | 1119 | |
c354e124 | 1120 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1121 | return -EFAULT; |
1122 | return 0; | |
1123 | } | |
1124 | read_unlock(&mrt_lock); | |
1125 | return -EADDRNOTAVAIL; | |
1126 | default: | |
1127 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1128 | } |
1129 | } | |
1130 | ||
1131 | ||
1132 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1133 | { | |
e9dc8653 | 1134 | struct net_device *dev = ptr; |
1da177e4 LT |
1135 | struct vif_device *v; |
1136 | int ct; | |
e9dc8653 | 1137 | |
721499e8 | 1138 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
1139 | return NOTIFY_DONE; |
1140 | ||
1da177e4 LT |
1141 | if (event != NETDEV_UNREGISTER) |
1142 | return NOTIFY_DONE; | |
1143 | v=&vif_table[0]; | |
c354e124 JK |
1144 | for (ct=0; ct<maxvif; ct++,v++) { |
1145 | if (v->dev == dev) | |
7dc00c82 | 1146 | vif_delete(ct, 1); |
1da177e4 LT |
1147 | } |
1148 | return NOTIFY_DONE; | |
1149 | } | |
1150 | ||
1151 | ||
c354e124 | 1152 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1153 | .notifier_call = ipmr_device_event, |
1154 | }; | |
1155 | ||
1156 | /* | |
1157 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1158 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1159 | * important for multicast video. | |
1160 | */ | |
e905a9ed | 1161 | |
114c7844 | 1162 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1163 | { |
8856dfa3 | 1164 | struct iphdr *iph; |
eddc9ec5 | 1165 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1166 | |
1167 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1168 | skb->transport_header = skb->network_header; |
8856dfa3 | 1169 | skb_reset_network_header(skb); |
eddc9ec5 | 1170 | iph = ip_hdr(skb); |
1da177e4 LT |
1171 | |
1172 | iph->version = 4; | |
e023dd64 ACM |
1173 | iph->tos = old_iph->tos; |
1174 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1175 | iph->frag_off = 0; |
1176 | iph->daddr = daddr; | |
1177 | iph->saddr = saddr; | |
1178 | iph->protocol = IPPROTO_IPIP; | |
1179 | iph->ihl = 5; | |
1180 | iph->tot_len = htons(skb->len); | |
1181 | ip_select_ident(iph, skb->dst, NULL); | |
1182 | ip_send_check(iph); | |
1183 | ||
1da177e4 LT |
1184 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1185 | nf_reset(skb); | |
1186 | } | |
1187 | ||
1188 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1189 | { | |
1190 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1191 | ||
7c73a6fa | 1192 | IP_INC_STATS_BH(dev_net(skb->dst->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1193 | |
1194 | if (unlikely(opt->optlen)) | |
1195 | ip_forward_options(skb); | |
1196 | ||
1197 | return dst_output(skb); | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * Processing handlers for ipmr_forward | |
1202 | */ | |
1203 | ||
1204 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1205 | { | |
eddc9ec5 | 1206 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1207 | struct vif_device *vif = &vif_table[vifi]; |
1208 | struct net_device *dev; | |
1209 | struct rtable *rt; | |
1210 | int encap = 0; | |
1211 | ||
1212 | if (vif->dev == NULL) | |
1213 | goto out_free; | |
1214 | ||
1215 | #ifdef CONFIG_IP_PIMSM | |
1216 | if (vif->flags & VIFF_REGISTER) { | |
1217 | vif->pkt_out++; | |
c354e124 | 1218 | vif->bytes_out += skb->len; |
cf3677ae PE |
1219 | vif->dev->stats.tx_bytes += skb->len; |
1220 | vif->dev->stats.tx_packets++; | |
1da177e4 LT |
1221 | ipmr_cache_report(skb, vifi, IGMPMSG_WHOLEPKT); |
1222 | kfree_skb(skb); | |
1223 | return; | |
1224 | } | |
1225 | #endif | |
1226 | ||
1227 | if (vif->flags&VIFF_TUNNEL) { | |
1228 | struct flowi fl = { .oif = vif->link, | |
1229 | .nl_u = { .ip4_u = | |
1230 | { .daddr = vif->remote, | |
1231 | .saddr = vif->local, | |
1232 | .tos = RT_TOS(iph->tos) } }, | |
1233 | .proto = IPPROTO_IPIP }; | |
f206351a | 1234 | if (ip_route_output_key(&init_net, &rt, &fl)) |
1da177e4 LT |
1235 | goto out_free; |
1236 | encap = sizeof(struct iphdr); | |
1237 | } else { | |
1238 | struct flowi fl = { .oif = vif->link, | |
1239 | .nl_u = { .ip4_u = | |
1240 | { .daddr = iph->daddr, | |
1241 | .tos = RT_TOS(iph->tos) } }, | |
1242 | .proto = IPPROTO_IPIP }; | |
f206351a | 1243 | if (ip_route_output_key(&init_net, &rt, &fl)) |
1da177e4 LT |
1244 | goto out_free; |
1245 | } | |
1246 | ||
1247 | dev = rt->u.dst.dev; | |
1248 | ||
1249 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1250 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1251 | allow to send ICMP, so that packets will disappear | |
1252 | to blackhole. | |
1253 | */ | |
1254 | ||
7c73a6fa | 1255 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1256 | ip_rt_put(rt); |
1257 | goto out_free; | |
1258 | } | |
1259 | ||
1260 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1261 | ||
1262 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1263 | ip_rt_put(rt); |
1da177e4 LT |
1264 | goto out_free; |
1265 | } | |
1266 | ||
1267 | vif->pkt_out++; | |
c354e124 | 1268 | vif->bytes_out += skb->len; |
1da177e4 LT |
1269 | |
1270 | dst_release(skb->dst); | |
1271 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1272 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1273 | |
1274 | /* FIXME: forward and output firewalls used to be called here. | |
1275 | * What do we do with netfilter? -- RR */ | |
1276 | if (vif->flags & VIFF_TUNNEL) { | |
1277 | ip_encap(skb, vif->local, vif->remote); | |
1278 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1279 | vif->dev->stats.tx_packets++; |
1280 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1284 | ||
1285 | /* | |
1286 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1287 | * not only before forwarding, but after forwarding on all output | |
1288 | * interfaces. It is clear, if mrouter runs a multicasting | |
1289 | * program, it should receive packets not depending to what interface | |
1290 | * program is joined. | |
1291 | * If we will not make it, the program will have to join on all | |
1292 | * interfaces. On the other hand, multihoming host (or router, but | |
1293 | * not mrouter) cannot join to more than one interface - it will | |
1294 | * result in receiving multiple packets. | |
1295 | */ | |
6e23ae2a | 1296 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1297 | ipmr_forward_finish); |
1298 | return; | |
1299 | ||
1300 | out_free: | |
1301 | kfree_skb(skb); | |
1302 | return; | |
1303 | } | |
1304 | ||
1305 | static int ipmr_find_vif(struct net_device *dev) | |
1306 | { | |
1307 | int ct; | |
1308 | for (ct=maxvif-1; ct>=0; ct--) { | |
1309 | if (vif_table[ct].dev == dev) | |
1310 | break; | |
1311 | } | |
1312 | return ct; | |
1313 | } | |
1314 | ||
1315 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1316 | ||
1317 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1318 | { | |
1319 | int psend = -1; | |
1320 | int vif, ct; | |
1321 | ||
1322 | vif = cache->mfc_parent; | |
1323 | cache->mfc_un.res.pkt++; | |
1324 | cache->mfc_un.res.bytes += skb->len; | |
1325 | ||
1326 | /* | |
1327 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1328 | */ | |
1329 | if (vif_table[vif].dev != skb->dev) { | |
1330 | int true_vifi; | |
1331 | ||
ee6b9673 | 1332 | if (skb->rtable->fl.iif == 0) { |
1da177e4 LT |
1333 | /* It is our own packet, looped back. |
1334 | Very complicated situation... | |
1335 | ||
1336 | The best workaround until routing daemons will be | |
1337 | fixed is not to redistribute packet, if it was | |
1338 | send through wrong interface. It means, that | |
1339 | multicast applications WILL NOT work for | |
1340 | (S,G), which have default multicast route pointing | |
1341 | to wrong oif. In any case, it is not a good | |
1342 | idea to use multicasting applications on router. | |
1343 | */ | |
1344 | goto dont_forward; | |
1345 | } | |
1346 | ||
1347 | cache->mfc_un.res.wrong_if++; | |
1348 | true_vifi = ipmr_find_vif(skb->dev); | |
1349 | ||
1350 | if (true_vifi >= 0 && mroute_do_assert && | |
1351 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1352 | so that we cannot check that packet arrived on an oif. | |
1353 | It is bad, but otherwise we would need to move pretty | |
1354 | large chunk of pimd to kernel. Ough... --ANK | |
1355 | */ | |
1356 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
e905a9ed | 1357 | time_after(jiffies, |
1da177e4 LT |
1358 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1359 | cache->mfc_un.res.last_assert = jiffies; | |
1360 | ipmr_cache_report(skb, true_vifi, IGMPMSG_WRONGVIF); | |
1361 | } | |
1362 | goto dont_forward; | |
1363 | } | |
1364 | ||
1365 | vif_table[vif].pkt_in++; | |
c354e124 | 1366 | vif_table[vif].bytes_in += skb->len; |
1da177e4 LT |
1367 | |
1368 | /* | |
1369 | * Forward the frame | |
1370 | */ | |
1371 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1372 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1373 | if (psend != -1) { |
1374 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1375 | if (skb2) | |
1376 | ipmr_queue_xmit(skb2, cache, psend); | |
1377 | } | |
c354e124 | 1378 | psend = ct; |
1da177e4 LT |
1379 | } |
1380 | } | |
1381 | if (psend != -1) { | |
1382 | if (local) { | |
1383 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1384 | if (skb2) | |
1385 | ipmr_queue_xmit(skb2, cache, psend); | |
1386 | } else { | |
1387 | ipmr_queue_xmit(skb, cache, psend); | |
1388 | return 0; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | dont_forward: | |
1393 | if (!local) | |
1394 | kfree_skb(skb); | |
1395 | return 0; | |
1396 | } | |
1397 | ||
1398 | ||
1399 | /* | |
1400 | * Multicast packets for forwarding arrive here | |
1401 | */ | |
1402 | ||
1403 | int ip_mr_input(struct sk_buff *skb) | |
1404 | { | |
1405 | struct mfc_cache *cache; | |
ee6b9673 | 1406 | int local = skb->rtable->rt_flags&RTCF_LOCAL; |
1da177e4 LT |
1407 | |
1408 | /* Packet is looped back after forward, it should not be | |
1409 | forwarded second time, but still can be delivered locally. | |
1410 | */ | |
1411 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1412 | goto dont_forward; | |
1413 | ||
1414 | if (!local) { | |
1415 | if (IPCB(skb)->opt.router_alert) { | |
1416 | if (ip_call_ra_chain(skb)) | |
1417 | return 0; | |
eddc9ec5 | 1418 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1419 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1420 | Cisco IOS <= 11.2(8)) do not put router alert | |
1421 | option to IGMP packets destined to routable | |
1422 | groups. It is very bad, because it means | |
1423 | that we can forward NO IGMP messages. | |
1424 | */ | |
1425 | read_lock(&mrt_lock); | |
70a269e6 | 1426 | if (init_net.ipv4.mroute_sk) { |
2715bcf9 | 1427 | nf_reset(skb); |
70a269e6 | 1428 | raw_rcv(init_net.ipv4.mroute_sk, skb); |
1da177e4 LT |
1429 | read_unlock(&mrt_lock); |
1430 | return 0; | |
1431 | } | |
1432 | read_unlock(&mrt_lock); | |
1433 | } | |
1434 | } | |
1435 | ||
1436 | read_lock(&mrt_lock); | |
eddc9ec5 | 1437 | cache = ipmr_cache_find(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1438 | |
1439 | /* | |
1440 | * No usable cache entry | |
1441 | */ | |
c354e124 | 1442 | if (cache == NULL) { |
1da177e4 LT |
1443 | int vif; |
1444 | ||
1445 | if (local) { | |
1446 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1447 | ip_local_deliver(skb); | |
1448 | if (skb2 == NULL) { | |
1449 | read_unlock(&mrt_lock); | |
1450 | return -ENOBUFS; | |
1451 | } | |
1452 | skb = skb2; | |
1453 | } | |
1454 | ||
1455 | vif = ipmr_find_vif(skb->dev); | |
1456 | if (vif >= 0) { | |
1457 | int err = ipmr_cache_unresolved(vif, skb); | |
1458 | read_unlock(&mrt_lock); | |
1459 | ||
1460 | return err; | |
1461 | } | |
1462 | read_unlock(&mrt_lock); | |
1463 | kfree_skb(skb); | |
1464 | return -ENODEV; | |
1465 | } | |
1466 | ||
1467 | ip_mr_forward(skb, cache, local); | |
1468 | ||
1469 | read_unlock(&mrt_lock); | |
1470 | ||
1471 | if (local) | |
1472 | return ip_local_deliver(skb); | |
1473 | ||
1474 | return 0; | |
1475 | ||
1476 | dont_forward: | |
1477 | if (local) | |
1478 | return ip_local_deliver(skb); | |
1479 | kfree_skb(skb); | |
1480 | return 0; | |
1481 | } | |
1482 | ||
b1879204 IJ |
1483 | #ifdef CONFIG_IP_PIMSM |
1484 | static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen) | |
1da177e4 | 1485 | { |
b1879204 IJ |
1486 | struct net_device *reg_dev = NULL; |
1487 | struct iphdr *encap; | |
1da177e4 | 1488 | |
b1879204 | 1489 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1490 | /* |
1491 | Check that: | |
1492 | a. packet is really destinted to a multicast group | |
1493 | b. packet is not a NULL-REGISTER | |
1494 | c. packet is not truncated | |
1495 | */ | |
f97c1e0c | 1496 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1497 | encap->tot_len == 0 || |
b1879204 IJ |
1498 | ntohs(encap->tot_len) + pimlen > skb->len) |
1499 | return 1; | |
1da177e4 LT |
1500 | |
1501 | read_lock(&mrt_lock); | |
1502 | if (reg_vif_num >= 0) | |
1503 | reg_dev = vif_table[reg_vif_num].dev; | |
1504 | if (reg_dev) | |
1505 | dev_hold(reg_dev); | |
1506 | read_unlock(&mrt_lock); | |
1507 | ||
e905a9ed | 1508 | if (reg_dev == NULL) |
b1879204 | 1509 | return 1; |
1da177e4 | 1510 | |
b0e380b1 | 1511 | skb->mac_header = skb->network_header; |
1da177e4 | 1512 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1513 | skb_reset_network_header(skb); |
1da177e4 | 1514 | skb->dev = reg_dev; |
1da177e4 LT |
1515 | skb->protocol = htons(ETH_P_IP); |
1516 | skb->ip_summed = 0; | |
1517 | skb->pkt_type = PACKET_HOST; | |
1518 | dst_release(skb->dst); | |
1519 | skb->dst = NULL; | |
cf3677ae PE |
1520 | reg_dev->stats.rx_bytes += skb->len; |
1521 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1522 | nf_reset(skb); |
1523 | netif_rx(skb); | |
1524 | dev_put(reg_dev); | |
b1879204 | 1525 | |
1da177e4 | 1526 | return 0; |
b1879204 IJ |
1527 | } |
1528 | #endif | |
1529 | ||
1530 | #ifdef CONFIG_IP_PIMSM_V1 | |
1531 | /* | |
1532 | * Handle IGMP messages of PIMv1 | |
1533 | */ | |
1534 | ||
1535 | int pim_rcv_v1(struct sk_buff * skb) | |
1536 | { | |
1537 | struct igmphdr *pim; | |
1538 | ||
1539 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1540 | goto drop; | |
1541 | ||
1542 | pim = igmp_hdr(skb); | |
1543 | ||
1544 | if (!mroute_do_pim || | |
1545 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) | |
1546 | goto drop; | |
1547 | ||
1548 | if (__pim_rcv(skb, sizeof(*pim))) { | |
1549 | drop: | |
1550 | kfree_skb(skb); | |
1551 | } | |
1da177e4 LT |
1552 | return 0; |
1553 | } | |
1554 | #endif | |
1555 | ||
1556 | #ifdef CONFIG_IP_PIMSM_V2 | |
1557 | static int pim_rcv(struct sk_buff * skb) | |
1558 | { | |
1559 | struct pimreghdr *pim; | |
1da177e4 | 1560 | |
b1879204 | 1561 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1562 | goto drop; |
1563 | ||
9c70220b | 1564 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1565 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1566 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1567 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1568 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1569 | goto drop; |
1570 | ||
b1879204 IJ |
1571 | if (__pim_rcv(skb, sizeof(*pim))) { |
1572 | drop: | |
1573 | kfree_skb(skb); | |
1574 | } | |
1da177e4 LT |
1575 | return 0; |
1576 | } | |
1577 | #endif | |
1578 | ||
1579 | static int | |
1580 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1581 | { | |
1582 | int ct; | |
1583 | struct rtnexthop *nhp; | |
1584 | struct net_device *dev = vif_table[c->mfc_parent].dev; | |
27a884dc | 1585 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1586 | struct rtattr *mp_head; |
1587 | ||
1588 | if (dev) | |
1589 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1590 | ||
c354e124 | 1591 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1592 | |
1593 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1594 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1595 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1596 | goto rtattr_failure; | |
c354e124 | 1597 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1598 | nhp->rtnh_flags = 0; |
1599 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1600 | nhp->rtnh_ifindex = vif_table[ct].dev->ifindex; | |
1601 | nhp->rtnh_len = sizeof(*nhp); | |
1602 | } | |
1603 | } | |
1604 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1605 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1606 | rtm->rtm_type = RTN_MULTICAST; |
1607 | return 1; | |
1608 | ||
1609 | rtattr_failure: | |
dc5fc579 | 1610 | nlmsg_trim(skb, b); |
1da177e4 LT |
1611 | return -EMSGSIZE; |
1612 | } | |
1613 | ||
1614 | int ipmr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1615 | { | |
1616 | int err; | |
1617 | struct mfc_cache *cache; | |
ee6b9673 | 1618 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1619 | |
1620 | read_lock(&mrt_lock); | |
1621 | cache = ipmr_cache_find(rt->rt_src, rt->rt_dst); | |
1622 | ||
c354e124 | 1623 | if (cache == NULL) { |
72287490 | 1624 | struct sk_buff *skb2; |
eddc9ec5 | 1625 | struct iphdr *iph; |
1da177e4 LT |
1626 | struct net_device *dev; |
1627 | int vif; | |
1628 | ||
1629 | if (nowait) { | |
1630 | read_unlock(&mrt_lock); | |
1631 | return -EAGAIN; | |
1632 | } | |
1633 | ||
1634 | dev = skb->dev; | |
1635 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1636 | read_unlock(&mrt_lock); | |
1637 | return -ENODEV; | |
1638 | } | |
72287490 AK |
1639 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1640 | if (!skb2) { | |
1641 | read_unlock(&mrt_lock); | |
1642 | return -ENOMEM; | |
1643 | } | |
1644 | ||
e2d1bca7 ACM |
1645 | skb_push(skb2, sizeof(struct iphdr)); |
1646 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1647 | iph = ip_hdr(skb2); |
1648 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1649 | iph->saddr = rt->rt_src; | |
1650 | iph->daddr = rt->rt_dst; | |
1651 | iph->version = 0; | |
72287490 | 1652 | err = ipmr_cache_unresolved(vif, skb2); |
1da177e4 LT |
1653 | read_unlock(&mrt_lock); |
1654 | return err; | |
1655 | } | |
1656 | ||
1657 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1658 | cache->mfc_flags |= MFC_NOTIFY; | |
1659 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1660 | read_unlock(&mrt_lock); | |
1661 | return err; | |
1662 | } | |
1663 | ||
e905a9ed | 1664 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1665 | /* |
1666 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1667 | */ | |
1668 | struct ipmr_vif_iter { | |
1669 | int ct; | |
1670 | }; | |
1671 | ||
1672 | static struct vif_device *ipmr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
1673 | loff_t pos) | |
1674 | { | |
1675 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
132adf54 | 1676 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 | 1677 | continue; |
e905a9ed | 1678 | if (pos-- == 0) |
1da177e4 LT |
1679 | return &vif_table[iter->ct]; |
1680 | } | |
1681 | return NULL; | |
1682 | } | |
1683 | ||
1684 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 1685 | __acquires(mrt_lock) |
1da177e4 LT |
1686 | { |
1687 | read_lock(&mrt_lock); | |
e905a9ed | 1688 | return *pos ? ipmr_vif_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1689 | : SEQ_START_TOKEN; |
1690 | } | |
1691 | ||
1692 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1693 | { | |
1694 | struct ipmr_vif_iter *iter = seq->private; | |
1695 | ||
1696 | ++*pos; | |
1697 | if (v == SEQ_START_TOKEN) | |
1698 | return ipmr_vif_seq_idx(iter, 0); | |
e905a9ed | 1699 | |
1da177e4 | 1700 | while (++iter->ct < maxvif) { |
132adf54 | 1701 | if (!VIF_EXISTS(iter->ct)) |
1da177e4 LT |
1702 | continue; |
1703 | return &vif_table[iter->ct]; | |
1704 | } | |
1705 | return NULL; | |
1706 | } | |
1707 | ||
1708 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 1709 | __releases(mrt_lock) |
1da177e4 LT |
1710 | { |
1711 | read_unlock(&mrt_lock); | |
1712 | } | |
1713 | ||
1714 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1715 | { | |
1716 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1717 | seq_puts(seq, |
1da177e4 LT |
1718 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1719 | } else { | |
1720 | const struct vif_device *vif = v; | |
1721 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1722 | ||
1723 | seq_printf(seq, | |
1724 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
1725 | vif - vif_table, | |
e905a9ed | 1726 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1727 | vif->bytes_out, vif->pkt_out, |
1728 | vif->flags, vif->local, vif->remote); | |
1729 | } | |
1730 | return 0; | |
1731 | } | |
1732 | ||
f690808e | 1733 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1734 | .start = ipmr_vif_seq_start, |
1735 | .next = ipmr_vif_seq_next, | |
1736 | .stop = ipmr_vif_seq_stop, | |
1737 | .show = ipmr_vif_seq_show, | |
1738 | }; | |
1739 | ||
1740 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1741 | { | |
cf7732e4 PE |
1742 | return seq_open_private(file, &ipmr_vif_seq_ops, |
1743 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
1744 | } |
1745 | ||
9a32144e | 1746 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1747 | .owner = THIS_MODULE, |
1748 | .open = ipmr_vif_open, | |
1749 | .read = seq_read, | |
1750 | .llseek = seq_lseek, | |
1751 | .release = seq_release_private, | |
1752 | }; | |
1753 | ||
1754 | struct ipmr_mfc_iter { | |
1755 | struct mfc_cache **cache; | |
1756 | int ct; | |
1757 | }; | |
1758 | ||
1759 | ||
1760 | static struct mfc_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
1761 | { | |
1762 | struct mfc_cache *mfc; | |
1763 | ||
1764 | it->cache = mfc_cache_array; | |
1765 | read_lock(&mrt_lock); | |
e905a9ed | 1766 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
132adf54 | 1767 | for (mfc = mfc_cache_array[it->ct]; mfc; mfc = mfc->next) |
e905a9ed | 1768 | if (pos-- == 0) |
1da177e4 LT |
1769 | return mfc; |
1770 | read_unlock(&mrt_lock); | |
1771 | ||
1772 | it->cache = &mfc_unres_queue; | |
1773 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1774 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
1da177e4 LT |
1775 | if (pos-- == 0) |
1776 | return mfc; | |
1777 | spin_unlock_bh(&mfc_unres_lock); | |
1778 | ||
1779 | it->cache = NULL; | |
1780 | return NULL; | |
1781 | } | |
1782 | ||
1783 | ||
1784 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1785 | { | |
1786 | struct ipmr_mfc_iter *it = seq->private; | |
1787 | it->cache = NULL; | |
1788 | it->ct = 0; | |
e905a9ed | 1789 | return *pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) |
1da177e4 LT |
1790 | : SEQ_START_TOKEN; |
1791 | } | |
1792 | ||
1793 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1794 | { | |
1795 | struct mfc_cache *mfc = v; | |
1796 | struct ipmr_mfc_iter *it = seq->private; | |
1797 | ||
1798 | ++*pos; | |
1799 | ||
1800 | if (v == SEQ_START_TOKEN) | |
1801 | return ipmr_mfc_seq_idx(seq->private, 0); | |
1802 | ||
1803 | if (mfc->next) | |
1804 | return mfc->next; | |
e905a9ed YH |
1805 | |
1806 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1807 | goto end_of_list; |
1808 | ||
1809 | BUG_ON(it->cache != mfc_cache_array); | |
1810 | ||
1811 | while (++it->ct < MFC_LINES) { | |
1812 | mfc = mfc_cache_array[it->ct]; | |
1813 | if (mfc) | |
1814 | return mfc; | |
1815 | } | |
1816 | ||
1817 | /* exhausted cache_array, show unresolved */ | |
1818 | read_unlock(&mrt_lock); | |
1819 | it->cache = &mfc_unres_queue; | |
1820 | it->ct = 0; | |
e905a9ed | 1821 | |
1da177e4 LT |
1822 | spin_lock_bh(&mfc_unres_lock); |
1823 | mfc = mfc_unres_queue; | |
e905a9ed | 1824 | if (mfc) |
1da177e4 LT |
1825 | return mfc; |
1826 | ||
1827 | end_of_list: | |
1828 | spin_unlock_bh(&mfc_unres_lock); | |
1829 | it->cache = NULL; | |
1830 | ||
1831 | return NULL; | |
1832 | } | |
1833 | ||
1834 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1835 | { | |
1836 | struct ipmr_mfc_iter *it = seq->private; | |
1837 | ||
1838 | if (it->cache == &mfc_unres_queue) | |
1839 | spin_unlock_bh(&mfc_unres_lock); | |
1840 | else if (it->cache == mfc_cache_array) | |
1841 | read_unlock(&mrt_lock); | |
1842 | } | |
1843 | ||
1844 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1845 | { | |
1846 | int n; | |
1847 | ||
1848 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1849 | seq_puts(seq, |
1da177e4 LT |
1850 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1851 | } else { | |
1852 | const struct mfc_cache *mfc = v; | |
1853 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1854 | |
999890b2 | 1855 | seq_printf(seq, "%08lX %08lX %-3hd", |
1da177e4 LT |
1856 | (unsigned long) mfc->mfc_mcastgrp, |
1857 | (unsigned long) mfc->mfc_origin, | |
1ea472e2 | 1858 | mfc->mfc_parent); |
1da177e4 LT |
1859 | |
1860 | if (it->cache != &mfc_unres_queue) { | |
1ea472e2 BT |
1861 | seq_printf(seq, " %8lu %8lu %8lu", |
1862 | mfc->mfc_un.res.pkt, | |
1863 | mfc->mfc_un.res.bytes, | |
1864 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
1865 | for (n = mfc->mfc_un.res.minvif; |
1866 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
1867 | if (VIF_EXISTS(n) | |
1da177e4 | 1868 | && mfc->mfc_un.res.ttls[n] < 255) |
e905a9ed YH |
1869 | seq_printf(seq, |
1870 | " %2d:%-3d", | |
1da177e4 LT |
1871 | n, mfc->mfc_un.res.ttls[n]); |
1872 | } | |
1ea472e2 BT |
1873 | } else { |
1874 | /* unresolved mfc_caches don't contain | |
1875 | * pkt, bytes and wrong_if values | |
1876 | */ | |
1877 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
1878 | } |
1879 | seq_putc(seq, '\n'); | |
1880 | } | |
1881 | return 0; | |
1882 | } | |
1883 | ||
f690808e | 1884 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1885 | .start = ipmr_mfc_seq_start, |
1886 | .next = ipmr_mfc_seq_next, | |
1887 | .stop = ipmr_mfc_seq_stop, | |
1888 | .show = ipmr_mfc_seq_show, | |
1889 | }; | |
1890 | ||
1891 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1892 | { | |
cf7732e4 PE |
1893 | return seq_open_private(file, &ipmr_mfc_seq_ops, |
1894 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
1895 | } |
1896 | ||
9a32144e | 1897 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1898 | .owner = THIS_MODULE, |
1899 | .open = ipmr_mfc_open, | |
1900 | .read = seq_read, | |
1901 | .llseek = seq_lseek, | |
1902 | .release = seq_release_private, | |
1903 | }; | |
e905a9ed | 1904 | #endif |
1da177e4 LT |
1905 | |
1906 | #ifdef CONFIG_IP_PIMSM_V2 | |
1907 | static struct net_protocol pim_protocol = { | |
1908 | .handler = pim_rcv, | |
1909 | }; | |
1910 | #endif | |
1911 | ||
1912 | ||
1913 | /* | |
1914 | * Setup for IP multicast routing | |
1915 | */ | |
e905a9ed | 1916 | |
03d2f897 | 1917 | int __init ip_mr_init(void) |
1da177e4 | 1918 | { |
03d2f897 WC |
1919 | int err; |
1920 | ||
1da177e4 LT |
1921 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
1922 | sizeof(struct mfc_cache), | |
e5d679f3 | 1923 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 1924 | NULL); |
03d2f897 WC |
1925 | if (!mrt_cachep) |
1926 | return -ENOMEM; | |
1927 | ||
b24b8a24 | 1928 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
03d2f897 WC |
1929 | err = register_netdevice_notifier(&ip_mr_notifier); |
1930 | if (err) | |
1931 | goto reg_notif_fail; | |
e905a9ed | 1932 | #ifdef CONFIG_PROC_FS |
03d2f897 WC |
1933 | err = -ENOMEM; |
1934 | if (!proc_net_fops_create(&init_net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
1935 | goto proc_vif_fail; | |
1936 | if (!proc_net_fops_create(&init_net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
1937 | goto proc_cache_fail; | |
e905a9ed | 1938 | #endif |
03d2f897 | 1939 | return 0; |
03d2f897 | 1940 | #ifdef CONFIG_PROC_FS |
03d2f897 WC |
1941 | proc_cache_fail: |
1942 | proc_net_remove(&init_net, "ip_mr_vif"); | |
c3e38896 BT |
1943 | proc_vif_fail: |
1944 | unregister_netdevice_notifier(&ip_mr_notifier); | |
03d2f897 | 1945 | #endif |
c3e38896 BT |
1946 | reg_notif_fail: |
1947 | del_timer(&ipmr_expire_timer); | |
1948 | kmem_cache_destroy(mrt_cachep); | |
03d2f897 | 1949 | return err; |
1da177e4 | 1950 | } |