Commit | Line | Data |
---|---|---|
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 | ||
cf958ae3 | 80 | #define VIF_EXISTS(_net, _idx) ((_net)->ipv4.vif_table[_idx].dev != NULL) |
1da177e4 | 81 | |
1da177e4 | 82 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
1da177e4 LT |
83 | |
84 | /* Special spinlock for queue of unresolved entries */ | |
85 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
86 | ||
87 | /* We return to original Alan's scheme. Hash table of resolved | |
88 | entries is changed only in process context and protected | |
89 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
90 | with strong spinlock mfc_unres_lock. | |
91 | ||
92 | In this case data path is free of exclusive locks at all. | |
93 | */ | |
94 | ||
e18b890b | 95 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
96 | |
97 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
4feb88e5 BT |
98 | static int ipmr_cache_report(struct net *net, |
99 | struct sk_buff *pkt, vifi_t vifi, int assert); | |
1da177e4 LT |
100 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); |
101 | ||
102 | #ifdef CONFIG_IP_PIMSM_V2 | |
103 | static struct net_protocol pim_protocol; | |
104 | #endif | |
105 | ||
106 | static struct timer_list ipmr_expire_timer; | |
107 | ||
108 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
109 | ||
d607032d WC |
110 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
111 | { | |
4feb88e5 BT |
112 | struct net *net = dev_net(dev); |
113 | ||
d607032d WC |
114 | dev_close(dev); |
115 | ||
4feb88e5 | 116 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 117 | if (dev) { |
5bc3eb7e | 118 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 119 | struct ifreq ifr; |
d607032d WC |
120 | struct ip_tunnel_parm p; |
121 | ||
122 | memset(&p, 0, sizeof(p)); | |
123 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
124 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
125 | p.iph.version = 4; | |
126 | p.iph.ihl = 5; | |
127 | p.iph.protocol = IPPROTO_IPIP; | |
128 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
129 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
130 | ||
5bc3eb7e SH |
131 | if (ops->ndo_do_ioctl) { |
132 | mm_segment_t oldfs = get_fs(); | |
133 | ||
134 | set_fs(KERNEL_DS); | |
135 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
136 | set_fs(oldfs); | |
137 | } | |
d607032d WC |
138 | } |
139 | } | |
140 | ||
1da177e4 | 141 | static |
4feb88e5 | 142 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
143 | { |
144 | struct net_device *dev; | |
145 | ||
4feb88e5 | 146 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
147 | |
148 | if (dev) { | |
5bc3eb7e | 149 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
150 | int err; |
151 | struct ifreq ifr; | |
1da177e4 LT |
152 | struct ip_tunnel_parm p; |
153 | struct in_device *in_dev; | |
154 | ||
155 | memset(&p, 0, sizeof(p)); | |
156 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
157 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
158 | p.iph.version = 4; | |
159 | p.iph.ihl = 5; | |
160 | p.iph.protocol = IPPROTO_IPIP; | |
161 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 162 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 163 | |
5bc3eb7e SH |
164 | if (ops->ndo_do_ioctl) { |
165 | mm_segment_t oldfs = get_fs(); | |
166 | ||
167 | set_fs(KERNEL_DS); | |
168 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
169 | set_fs(oldfs); | |
170 | } else | |
171 | err = -EOPNOTSUPP; | |
1da177e4 LT |
172 | |
173 | dev = NULL; | |
174 | ||
4feb88e5 BT |
175 | if (err == 0 && |
176 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
177 | dev->flags |= IFF_MULTICAST; |
178 | ||
e5ed6399 | 179 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 180 | if (in_dev == NULL) |
1da177e4 | 181 | goto failure; |
71e27da9 HX |
182 | |
183 | ipv4_devconf_setall(in_dev); | |
184 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
185 | |
186 | if (dev_open(dev)) | |
187 | goto failure; | |
7dc00c82 | 188 | dev_hold(dev); |
1da177e4 LT |
189 | } |
190 | } | |
191 | return dev; | |
192 | ||
193 | failure: | |
194 | /* allow the register to be completed before unregistering. */ | |
195 | rtnl_unlock(); | |
196 | rtnl_lock(); | |
197 | ||
198 | unregister_netdevice(dev); | |
199 | return NULL; | |
200 | } | |
201 | ||
202 | #ifdef CONFIG_IP_PIMSM | |
203 | ||
1da177e4 LT |
204 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
205 | { | |
4feb88e5 BT |
206 | struct net *net = dev_net(dev); |
207 | ||
1da177e4 | 208 | read_lock(&mrt_lock); |
cf3677ae PE |
209 | dev->stats.tx_bytes += skb->len; |
210 | dev->stats.tx_packets++; | |
4feb88e5 BT |
211 | ipmr_cache_report(net, skb, net->ipv4.mroute_reg_vif_num, |
212 | IGMPMSG_WHOLEPKT); | |
1da177e4 LT |
213 | read_unlock(&mrt_lock); |
214 | kfree_skb(skb); | |
215 | return 0; | |
216 | } | |
217 | ||
007c3838 SH |
218 | static const struct net_device_ops reg_vif_netdev_ops = { |
219 | .ndo_start_xmit = reg_vif_xmit, | |
220 | }; | |
221 | ||
1da177e4 LT |
222 | static void reg_vif_setup(struct net_device *dev) |
223 | { | |
224 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 225 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 226 | dev->flags = IFF_NOARP; |
007c3838 | 227 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 LT |
228 | dev->destructor = free_netdev; |
229 | } | |
230 | ||
231 | static struct net_device *ipmr_reg_vif(void) | |
232 | { | |
233 | struct net_device *dev; | |
234 | struct in_device *in_dev; | |
235 | ||
cf3677ae | 236 | dev = alloc_netdev(0, "pimreg", reg_vif_setup); |
1da177e4 LT |
237 | |
238 | if (dev == NULL) | |
239 | return NULL; | |
240 | ||
241 | if (register_netdevice(dev)) { | |
242 | free_netdev(dev); | |
243 | return NULL; | |
244 | } | |
245 | dev->iflink = 0; | |
246 | ||
71e27da9 HX |
247 | rcu_read_lock(); |
248 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
249 | rcu_read_unlock(); | |
1da177e4 | 250 | goto failure; |
71e27da9 | 251 | } |
1da177e4 | 252 | |
71e27da9 HX |
253 | ipv4_devconf_setall(in_dev); |
254 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
255 | rcu_read_unlock(); | |
1da177e4 LT |
256 | |
257 | if (dev_open(dev)) | |
258 | goto failure; | |
259 | ||
7dc00c82 WC |
260 | dev_hold(dev); |
261 | ||
1da177e4 LT |
262 | return dev; |
263 | ||
264 | failure: | |
265 | /* allow the register to be completed before unregistering. */ | |
266 | rtnl_unlock(); | |
267 | rtnl_lock(); | |
268 | ||
269 | unregister_netdevice(dev); | |
270 | return NULL; | |
271 | } | |
272 | #endif | |
273 | ||
274 | /* | |
275 | * Delete a VIF entry | |
7dc00c82 | 276 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 277 | */ |
e905a9ed | 278 | |
4feb88e5 | 279 | static int vif_delete(struct net *net, int vifi, int notify) |
1da177e4 LT |
280 | { |
281 | struct vif_device *v; | |
282 | struct net_device *dev; | |
283 | struct in_device *in_dev; | |
284 | ||
4feb88e5 | 285 | if (vifi < 0 || vifi >= net->ipv4.maxvif) |
1da177e4 LT |
286 | return -EADDRNOTAVAIL; |
287 | ||
4feb88e5 | 288 | v = &net->ipv4.vif_table[vifi]; |
1da177e4 LT |
289 | |
290 | write_lock_bh(&mrt_lock); | |
291 | dev = v->dev; | |
292 | v->dev = NULL; | |
293 | ||
294 | if (!dev) { | |
295 | write_unlock_bh(&mrt_lock); | |
296 | return -EADDRNOTAVAIL; | |
297 | } | |
298 | ||
299 | #ifdef CONFIG_IP_PIMSM | |
4feb88e5 BT |
300 | if (vifi == net->ipv4.mroute_reg_vif_num) |
301 | net->ipv4.mroute_reg_vif_num = -1; | |
1da177e4 LT |
302 | #endif |
303 | ||
4feb88e5 | 304 | if (vifi+1 == net->ipv4.maxvif) { |
1da177e4 LT |
305 | int tmp; |
306 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
4feb88e5 | 307 | if (VIF_EXISTS(net, tmp)) |
1da177e4 LT |
308 | break; |
309 | } | |
4feb88e5 | 310 | net->ipv4.maxvif = tmp+1; |
1da177e4 LT |
311 | } |
312 | ||
313 | write_unlock_bh(&mrt_lock); | |
314 | ||
315 | dev_set_allmulti(dev, -1); | |
316 | ||
e5ed6399 | 317 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 318 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
319 | ip_rt_multicast_event(in_dev); |
320 | } | |
321 | ||
7dc00c82 | 322 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
1da177e4 LT |
323 | unregister_netdevice(dev); |
324 | ||
325 | dev_put(dev); | |
326 | return 0; | |
327 | } | |
328 | ||
5c0a66f5 BT |
329 | static inline void ipmr_cache_free(struct mfc_cache *c) |
330 | { | |
331 | release_net(mfc_net(c)); | |
332 | kmem_cache_free(mrt_cachep, c); | |
333 | } | |
334 | ||
1da177e4 LT |
335 | /* Destroy an unresolved cache entry, killing queued skbs |
336 | and reporting error to netlink readers. | |
337 | */ | |
338 | ||
339 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
340 | { | |
341 | struct sk_buff *skb; | |
9ef1d4c7 | 342 | struct nlmsgerr *e; |
4feb88e5 | 343 | struct net *net = mfc_net(c); |
1da177e4 | 344 | |
4feb88e5 | 345 | atomic_dec(&net->ipv4.cache_resolve_queue_len); |
1da177e4 | 346 | |
c354e124 | 347 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 348 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
349 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
350 | nlh->nlmsg_type = NLMSG_ERROR; | |
351 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
352 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
353 | e = NLMSG_DATA(nlh); |
354 | e->error = -ETIMEDOUT; | |
355 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 356 | |
4feb88e5 | 357 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 LT |
358 | } else |
359 | kfree_skb(skb); | |
360 | } | |
361 | ||
5c0a66f5 | 362 | ipmr_cache_free(c); |
1da177e4 LT |
363 | } |
364 | ||
365 | ||
366 | /* Single timer process for all the unresolved queue. */ | |
367 | ||
368 | static void ipmr_expire_process(unsigned long dummy) | |
369 | { | |
370 | unsigned long now; | |
371 | unsigned long expires; | |
372 | struct mfc_cache *c, **cp; | |
373 | ||
374 | if (!spin_trylock(&mfc_unres_lock)) { | |
375 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
376 | return; | |
377 | } | |
378 | ||
1e8fb3b6 | 379 | if (mfc_unres_queue == NULL) |
1da177e4 LT |
380 | goto out; |
381 | ||
382 | now = jiffies; | |
383 | expires = 10*HZ; | |
384 | cp = &mfc_unres_queue; | |
385 | ||
386 | while ((c=*cp) != NULL) { | |
387 | if (time_after(c->mfc_un.unres.expires, now)) { | |
388 | unsigned long interval = c->mfc_un.unres.expires - now; | |
389 | if (interval < expires) | |
390 | expires = interval; | |
391 | cp = &c->next; | |
392 | continue; | |
393 | } | |
394 | ||
395 | *cp = c->next; | |
396 | ||
397 | ipmr_destroy_unres(c); | |
398 | } | |
399 | ||
1e8fb3b6 | 400 | if (mfc_unres_queue != NULL) |
1da177e4 LT |
401 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
402 | ||
403 | out: | |
404 | spin_unlock(&mfc_unres_lock); | |
405 | } | |
406 | ||
407 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
408 | ||
d1b04c08 | 409 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
410 | { |
411 | int vifi; | |
4feb88e5 | 412 | struct net *net = mfc_net(cache); |
1da177e4 LT |
413 | |
414 | cache->mfc_un.res.minvif = MAXVIFS; | |
415 | cache->mfc_un.res.maxvif = 0; | |
416 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
417 | ||
4feb88e5 BT |
418 | for (vifi = 0; vifi < net->ipv4.maxvif; vifi++) { |
419 | if (VIF_EXISTS(net, vifi) && | |
cf958ae3 | 420 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
421 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
422 | if (cache->mfc_un.res.minvif > vifi) | |
423 | cache->mfc_un.res.minvif = vifi; | |
424 | if (cache->mfc_un.res.maxvif <= vifi) | |
425 | cache->mfc_un.res.maxvif = vifi + 1; | |
426 | } | |
427 | } | |
428 | } | |
429 | ||
4feb88e5 | 430 | static int vif_add(struct net *net, struct vifctl *vifc, int mrtsock) |
1da177e4 LT |
431 | { |
432 | int vifi = vifc->vifc_vifi; | |
4feb88e5 | 433 | struct vif_device *v = &net->ipv4.vif_table[vifi]; |
1da177e4 LT |
434 | struct net_device *dev; |
435 | struct in_device *in_dev; | |
d607032d | 436 | int err; |
1da177e4 LT |
437 | |
438 | /* Is vif busy ? */ | |
4feb88e5 | 439 | if (VIF_EXISTS(net, vifi)) |
1da177e4 LT |
440 | return -EADDRINUSE; |
441 | ||
442 | switch (vifc->vifc_flags) { | |
443 | #ifdef CONFIG_IP_PIMSM | |
444 | case VIFF_REGISTER: | |
445 | /* | |
446 | * Special Purpose VIF in PIM | |
447 | * All the packets will be sent to the daemon | |
448 | */ | |
4feb88e5 | 449 | if (net->ipv4.mroute_reg_vif_num >= 0) |
1da177e4 LT |
450 | return -EADDRINUSE; |
451 | dev = ipmr_reg_vif(); | |
452 | if (!dev) | |
453 | return -ENOBUFS; | |
d607032d WC |
454 | err = dev_set_allmulti(dev, 1); |
455 | if (err) { | |
456 | unregister_netdevice(dev); | |
7dc00c82 | 457 | dev_put(dev); |
d607032d WC |
458 | return err; |
459 | } | |
1da177e4 LT |
460 | break; |
461 | #endif | |
e905a9ed | 462 | case VIFF_TUNNEL: |
4feb88e5 | 463 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
464 | if (!dev) |
465 | return -ENOBUFS; | |
d607032d WC |
466 | err = dev_set_allmulti(dev, 1); |
467 | if (err) { | |
468 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 469 | dev_put(dev); |
d607032d WC |
470 | return err; |
471 | } | |
1da177e4 LT |
472 | break; |
473 | case 0: | |
4feb88e5 | 474 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
1da177e4 LT |
475 | if (!dev) |
476 | return -EADDRNOTAVAIL; | |
d607032d | 477 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
478 | if (err) { |
479 | dev_put(dev); | |
d607032d | 480 | return err; |
7dc00c82 | 481 | } |
1da177e4 LT |
482 | break; |
483 | default: | |
484 | return -EINVAL; | |
485 | } | |
486 | ||
e5ed6399 | 487 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) |
1da177e4 | 488 | return -EADDRNOTAVAIL; |
42f811b8 | 489 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
490 | ip_rt_multicast_event(in_dev); |
491 | ||
492 | /* | |
493 | * Fill in the VIF structures | |
494 | */ | |
c354e124 JK |
495 | v->rate_limit = vifc->vifc_rate_limit; |
496 | v->local = vifc->vifc_lcl_addr.s_addr; | |
497 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
498 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
499 | if (!mrtsock) |
500 | v->flags |= VIFF_STATIC; | |
c354e124 | 501 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
502 | v->bytes_in = 0; |
503 | v->bytes_out = 0; | |
504 | v->pkt_in = 0; | |
505 | v->pkt_out = 0; | |
506 | v->link = dev->ifindex; | |
507 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
508 | v->link = dev->iflink; | |
509 | ||
510 | /* And finish update writing critical data */ | |
511 | write_lock_bh(&mrt_lock); | |
c354e124 | 512 | v->dev = dev; |
1da177e4 LT |
513 | #ifdef CONFIG_IP_PIMSM |
514 | if (v->flags&VIFF_REGISTER) | |
4feb88e5 | 515 | net->ipv4.mroute_reg_vif_num = vifi; |
1da177e4 | 516 | #endif |
4feb88e5 BT |
517 | if (vifi+1 > net->ipv4.maxvif) |
518 | net->ipv4.maxvif = vifi+1; | |
1da177e4 LT |
519 | write_unlock_bh(&mrt_lock); |
520 | return 0; | |
521 | } | |
522 | ||
4feb88e5 BT |
523 | static struct mfc_cache *ipmr_cache_find(struct net *net, |
524 | __be32 origin, | |
525 | __be32 mcastgrp) | |
1da177e4 | 526 | { |
c354e124 | 527 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
528 | struct mfc_cache *c; |
529 | ||
4feb88e5 | 530 | for (c = net->ipv4.mfc_cache_array[line]; c; c = c->next) { |
1da177e4 LT |
531 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) |
532 | break; | |
533 | } | |
534 | return c; | |
535 | } | |
536 | ||
537 | /* | |
538 | * Allocate a multicast cache entry | |
539 | */ | |
5c0a66f5 | 540 | static struct mfc_cache *ipmr_cache_alloc(struct net *net) |
1da177e4 | 541 | { |
c354e124 JK |
542 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
543 | if (c == NULL) | |
1da177e4 | 544 | return NULL; |
1da177e4 | 545 | c->mfc_un.res.minvif = MAXVIFS; |
5c0a66f5 | 546 | mfc_net_set(c, net); |
1da177e4 LT |
547 | return c; |
548 | } | |
549 | ||
5c0a66f5 | 550 | static struct mfc_cache *ipmr_cache_alloc_unres(struct net *net) |
1da177e4 | 551 | { |
c354e124 JK |
552 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
553 | if (c == NULL) | |
1da177e4 | 554 | return NULL; |
1da177e4 LT |
555 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
556 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
5c0a66f5 | 557 | mfc_net_set(c, net); |
1da177e4 LT |
558 | return c; |
559 | } | |
560 | ||
561 | /* | |
562 | * A cache entry has gone into a resolved state from queued | |
563 | */ | |
e905a9ed | 564 | |
1da177e4 LT |
565 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
566 | { | |
567 | struct sk_buff *skb; | |
9ef1d4c7 | 568 | struct nlmsgerr *e; |
1da177e4 LT |
569 | |
570 | /* | |
571 | * Play the pending entries through our router | |
572 | */ | |
573 | ||
c354e124 | 574 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 575 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
576 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
577 | ||
578 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
579 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
580 | (u8 *)nlh); | |
1da177e4 LT |
581 | } else { |
582 | nlh->nlmsg_type = NLMSG_ERROR; | |
583 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
584 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
585 | e = NLMSG_DATA(nlh); |
586 | e->error = -EMSGSIZE; | |
587 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 588 | } |
2942e900 | 589 | |
4feb88e5 | 590 | rtnl_unicast(skb, mfc_net(c), NETLINK_CB(skb).pid); |
1da177e4 LT |
591 | } else |
592 | ip_mr_forward(skb, c, 0); | |
593 | } | |
594 | } | |
595 | ||
596 | /* | |
597 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
598 | * expects the following bizarre scheme. | |
599 | * | |
600 | * Called under mrt_lock. | |
601 | */ | |
e905a9ed | 602 | |
4feb88e5 BT |
603 | static int ipmr_cache_report(struct net *net, |
604 | struct sk_buff *pkt, vifi_t vifi, int assert) | |
1da177e4 LT |
605 | { |
606 | struct sk_buff *skb; | |
c9bdd4b5 | 607 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
608 | struct igmphdr *igmp; |
609 | struct igmpmsg *msg; | |
610 | int ret; | |
611 | ||
612 | #ifdef CONFIG_IP_PIMSM | |
613 | if (assert == IGMPMSG_WHOLEPKT) | |
614 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
615 | else | |
616 | #endif | |
617 | skb = alloc_skb(128, GFP_ATOMIC); | |
618 | ||
132adf54 | 619 | if (!skb) |
1da177e4 LT |
620 | return -ENOBUFS; |
621 | ||
622 | #ifdef CONFIG_IP_PIMSM | |
623 | if (assert == IGMPMSG_WHOLEPKT) { | |
624 | /* Ugly, but we have no choice with this interface. | |
625 | Duplicate old header, fix ihl, length etc. | |
626 | And all this only to mangle msg->im_msgtype and | |
627 | to set msg->im_mbz to "mbz" :-) | |
628 | */ | |
878c8145 ACM |
629 | skb_push(skb, sizeof(struct iphdr)); |
630 | skb_reset_network_header(skb); | |
badff6d0 | 631 | skb_reset_transport_header(skb); |
0272ffc4 | 632 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 633 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
634 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
635 | msg->im_mbz = 0; | |
4feb88e5 | 636 | msg->im_vif = net->ipv4.mroute_reg_vif_num; |
eddc9ec5 ACM |
637 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
638 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
639 | sizeof(struct iphdr)); | |
e905a9ed | 640 | } else |
1da177e4 | 641 | #endif |
e905a9ed YH |
642 | { |
643 | ||
1da177e4 LT |
644 | /* |
645 | * Copy the IP header | |
646 | */ | |
647 | ||
27a884dc | 648 | skb->network_header = skb->tail; |
ddc7b8e3 | 649 | skb_put(skb, ihl); |
27d7ff46 | 650 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
651 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
652 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 LT |
653 | msg->im_vif = vifi; |
654 | skb->dst = dst_clone(pkt->dst); | |
655 | ||
656 | /* | |
657 | * Add our header | |
658 | */ | |
659 | ||
c354e124 | 660 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
661 | igmp->type = |
662 | msg->im_msgtype = assert; | |
663 | igmp->code = 0; | |
eddc9ec5 | 664 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 665 | skb->transport_header = skb->network_header; |
e905a9ed | 666 | } |
1da177e4 | 667 | |
4feb88e5 | 668 | if (net->ipv4.mroute_sk == NULL) { |
1da177e4 LT |
669 | kfree_skb(skb); |
670 | return -EINVAL; | |
671 | } | |
672 | ||
673 | /* | |
674 | * Deliver to mrouted | |
675 | */ | |
4feb88e5 | 676 | ret = sock_queue_rcv_skb(net->ipv4.mroute_sk, skb); |
70a269e6 | 677 | if (ret < 0) { |
1da177e4 LT |
678 | if (net_ratelimit()) |
679 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
680 | kfree_skb(skb); | |
681 | } | |
682 | ||
683 | return ret; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Queue a packet for resolution. It gets locked cache entry! | |
688 | */ | |
e905a9ed | 689 | |
1da177e4 | 690 | static int |
4feb88e5 | 691 | ipmr_cache_unresolved(struct net *net, vifi_t vifi, struct sk_buff *skb) |
1da177e4 LT |
692 | { |
693 | int err; | |
694 | struct mfc_cache *c; | |
eddc9ec5 | 695 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
696 | |
697 | spin_lock_bh(&mfc_unres_lock); | |
698 | for (c=mfc_unres_queue; c; c=c->next) { | |
4feb88e5 | 699 | if (net_eq(mfc_net(c), net) && |
1e8fb3b6 | 700 | c->mfc_mcastgrp == iph->daddr && |
eddc9ec5 | 701 | c->mfc_origin == iph->saddr) |
1da177e4 LT |
702 | break; |
703 | } | |
704 | ||
705 | if (c == NULL) { | |
706 | /* | |
707 | * Create a new entry if allowable | |
708 | */ | |
709 | ||
4feb88e5 BT |
710 | if (atomic_read(&net->ipv4.cache_resolve_queue_len) >= 10 || |
711 | (c = ipmr_cache_alloc_unres(net)) == NULL) { | |
1da177e4 LT |
712 | spin_unlock_bh(&mfc_unres_lock); |
713 | ||
714 | kfree_skb(skb); | |
715 | return -ENOBUFS; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Fill in the new cache entry | |
720 | */ | |
eddc9ec5 ACM |
721 | c->mfc_parent = -1; |
722 | c->mfc_origin = iph->saddr; | |
723 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
724 | |
725 | /* | |
726 | * Reflect first query at mrouted. | |
727 | */ | |
4feb88e5 BT |
728 | err = ipmr_cache_report(net, skb, vifi, IGMPMSG_NOCACHE); |
729 | if (err < 0) { | |
e905a9ed | 730 | /* If the report failed throw the cache entry |
1da177e4 LT |
731 | out - Brad Parker |
732 | */ | |
733 | spin_unlock_bh(&mfc_unres_lock); | |
734 | ||
5c0a66f5 | 735 | ipmr_cache_free(c); |
1da177e4 LT |
736 | kfree_skb(skb); |
737 | return err; | |
738 | } | |
739 | ||
4feb88e5 | 740 | atomic_inc(&net->ipv4.cache_resolve_queue_len); |
1da177e4 LT |
741 | c->next = mfc_unres_queue; |
742 | mfc_unres_queue = c; | |
743 | ||
744 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
745 | } | |
746 | ||
747 | /* | |
748 | * See if we can append the packet | |
749 | */ | |
750 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
751 | kfree_skb(skb); | |
752 | err = -ENOBUFS; | |
753 | } else { | |
c354e124 | 754 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
755 | err = 0; |
756 | } | |
757 | ||
758 | spin_unlock_bh(&mfc_unres_lock); | |
759 | return err; | |
760 | } | |
761 | ||
762 | /* | |
763 | * MFC cache manipulation by user space mroute daemon | |
764 | */ | |
765 | ||
4feb88e5 | 766 | static int ipmr_mfc_delete(struct net *net, struct mfcctl *mfc) |
1da177e4 LT |
767 | { |
768 | int line; | |
769 | struct mfc_cache *c, **cp; | |
770 | ||
c354e124 | 771 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 772 | |
4feb88e5 | 773 | for (cp = &net->ipv4.mfc_cache_array[line]; |
2bb8b26c | 774 | (c = *cp) != NULL; cp = &c->next) { |
1da177e4 LT |
775 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
776 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
777 | write_lock_bh(&mrt_lock); | |
778 | *cp = c->next; | |
779 | write_unlock_bh(&mrt_lock); | |
780 | ||
5c0a66f5 | 781 | ipmr_cache_free(c); |
1da177e4 LT |
782 | return 0; |
783 | } | |
784 | } | |
785 | return -ENOENT; | |
786 | } | |
787 | ||
4feb88e5 | 788 | static int ipmr_mfc_add(struct net *net, struct mfcctl *mfc, int mrtsock) |
1da177e4 LT |
789 | { |
790 | int line; | |
791 | struct mfc_cache *uc, *c, **cp; | |
792 | ||
c354e124 | 793 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 794 | |
4feb88e5 | 795 | for (cp = &net->ipv4.mfc_cache_array[line]; |
2bb8b26c | 796 | (c = *cp) != NULL; cp = &c->next) { |
1da177e4 LT |
797 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
798 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
799 | break; | |
800 | } | |
801 | ||
802 | if (c != NULL) { | |
803 | write_lock_bh(&mrt_lock); | |
804 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 805 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
806 | if (!mrtsock) |
807 | c->mfc_flags |= MFC_STATIC; | |
808 | write_unlock_bh(&mrt_lock); | |
809 | return 0; | |
810 | } | |
811 | ||
f97c1e0c | 812 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
813 | return -EINVAL; |
814 | ||
4feb88e5 | 815 | c = ipmr_cache_alloc(net); |
c354e124 | 816 | if (c == NULL) |
1da177e4 LT |
817 | return -ENOMEM; |
818 | ||
c354e124 JK |
819 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
820 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
821 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 822 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
823 | if (!mrtsock) |
824 | c->mfc_flags |= MFC_STATIC; | |
825 | ||
826 | write_lock_bh(&mrt_lock); | |
4feb88e5 BT |
827 | c->next = net->ipv4.mfc_cache_array[line]; |
828 | net->ipv4.mfc_cache_array[line] = c; | |
1da177e4 LT |
829 | write_unlock_bh(&mrt_lock); |
830 | ||
831 | /* | |
832 | * Check to see if we resolved a queued list. If so we | |
833 | * need to send on the frames and tidy up. | |
834 | */ | |
835 | spin_lock_bh(&mfc_unres_lock); | |
836 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
837 | cp = &uc->next) { | |
4feb88e5 | 838 | if (net_eq(mfc_net(uc), net) && |
1e8fb3b6 | 839 | uc->mfc_origin == c->mfc_origin && |
1da177e4 LT |
840 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
841 | *cp = uc->next; | |
4feb88e5 | 842 | atomic_dec(&net->ipv4.cache_resolve_queue_len); |
1da177e4 LT |
843 | break; |
844 | } | |
845 | } | |
1e8fb3b6 BT |
846 | if (mfc_unres_queue == NULL) |
847 | del_timer(&ipmr_expire_timer); | |
1da177e4 LT |
848 | spin_unlock_bh(&mfc_unres_lock); |
849 | ||
850 | if (uc) { | |
851 | ipmr_cache_resolve(uc, c); | |
5c0a66f5 | 852 | ipmr_cache_free(uc); |
1da177e4 LT |
853 | } |
854 | return 0; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Close the multicast socket, and clear the vif tables etc | |
859 | */ | |
e905a9ed | 860 | |
4feb88e5 | 861 | static void mroute_clean_tables(struct net *net) |
1da177e4 LT |
862 | { |
863 | int i; | |
e905a9ed | 864 | |
1da177e4 LT |
865 | /* |
866 | * Shut down all active vif entries | |
867 | */ | |
4feb88e5 BT |
868 | for (i = 0; i < net->ipv4.maxvif; i++) { |
869 | if (!(net->ipv4.vif_table[i].flags&VIFF_STATIC)) | |
870 | vif_delete(net, i, 0); | |
1da177e4 LT |
871 | } |
872 | ||
873 | /* | |
874 | * Wipe the cache | |
875 | */ | |
c354e124 | 876 | for (i=0; i<MFC_LINES; i++) { |
1da177e4 LT |
877 | struct mfc_cache *c, **cp; |
878 | ||
4feb88e5 | 879 | cp = &net->ipv4.mfc_cache_array[i]; |
1da177e4 LT |
880 | while ((c = *cp) != NULL) { |
881 | if (c->mfc_flags&MFC_STATIC) { | |
882 | cp = &c->next; | |
883 | continue; | |
884 | } | |
885 | write_lock_bh(&mrt_lock); | |
886 | *cp = c->next; | |
887 | write_unlock_bh(&mrt_lock); | |
888 | ||
5c0a66f5 | 889 | ipmr_cache_free(c); |
1da177e4 LT |
890 | } |
891 | } | |
892 | ||
4feb88e5 | 893 | if (atomic_read(&net->ipv4.cache_resolve_queue_len) != 0) { |
1e8fb3b6 | 894 | struct mfc_cache *c, **cp; |
1da177e4 LT |
895 | |
896 | spin_lock_bh(&mfc_unres_lock); | |
1e8fb3b6 BT |
897 | cp = &mfc_unres_queue; |
898 | while ((c = *cp) != NULL) { | |
4feb88e5 | 899 | if (!net_eq(mfc_net(c), net)) { |
1e8fb3b6 BT |
900 | cp = &c->next; |
901 | continue; | |
902 | } | |
903 | *cp = c->next; | |
1da177e4 LT |
904 | |
905 | ipmr_destroy_unres(c); | |
1da177e4 LT |
906 | } |
907 | spin_unlock_bh(&mfc_unres_lock); | |
908 | } | |
909 | } | |
910 | ||
911 | static void mrtsock_destruct(struct sock *sk) | |
912 | { | |
4feb88e5 BT |
913 | struct net *net = sock_net(sk); |
914 | ||
1da177e4 | 915 | rtnl_lock(); |
4feb88e5 BT |
916 | if (sk == net->ipv4.mroute_sk) { |
917 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; | |
1da177e4 LT |
918 | |
919 | write_lock_bh(&mrt_lock); | |
4feb88e5 | 920 | net->ipv4.mroute_sk = NULL; |
1da177e4 LT |
921 | write_unlock_bh(&mrt_lock); |
922 | ||
4feb88e5 | 923 | mroute_clean_tables(net); |
1da177e4 LT |
924 | } |
925 | rtnl_unlock(); | |
926 | } | |
927 | ||
928 | /* | |
929 | * Socket options and virtual interface manipulation. The whole | |
930 | * virtual interface system is a complete heap, but unfortunately | |
931 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
932 | * MOSPF/PIM router set up we can clean this up. | |
933 | */ | |
e905a9ed | 934 | |
c354e124 | 935 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) |
1da177e4 LT |
936 | { |
937 | int ret; | |
938 | struct vifctl vif; | |
939 | struct mfcctl mfc; | |
4feb88e5 | 940 | struct net *net = sock_net(sk); |
e905a9ed | 941 | |
132adf54 | 942 | if (optname != MRT_INIT) { |
4feb88e5 | 943 | if (sk != net->ipv4.mroute_sk && !capable(CAP_NET_ADMIN)) |
1da177e4 LT |
944 | return -EACCES; |
945 | } | |
946 | ||
132adf54 SH |
947 | switch (optname) { |
948 | case MRT_INIT: | |
949 | if (sk->sk_type != SOCK_RAW || | |
950 | inet_sk(sk)->num != IPPROTO_IGMP) | |
951 | return -EOPNOTSUPP; | |
c354e124 | 952 | if (optlen != sizeof(int)) |
132adf54 | 953 | return -ENOPROTOOPT; |
1da177e4 | 954 | |
132adf54 | 955 | rtnl_lock(); |
4feb88e5 | 956 | if (net->ipv4.mroute_sk) { |
1da177e4 | 957 | rtnl_unlock(); |
132adf54 SH |
958 | return -EADDRINUSE; |
959 | } | |
960 | ||
961 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
962 | if (ret == 0) { | |
963 | write_lock_bh(&mrt_lock); | |
4feb88e5 | 964 | net->ipv4.mroute_sk = sk; |
132adf54 SH |
965 | write_unlock_bh(&mrt_lock); |
966 | ||
4feb88e5 | 967 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
132adf54 SH |
968 | } |
969 | rtnl_unlock(); | |
970 | return ret; | |
971 | case MRT_DONE: | |
4feb88e5 | 972 | if (sk != net->ipv4.mroute_sk) |
132adf54 SH |
973 | return -EACCES; |
974 | return ip_ra_control(sk, 0, NULL); | |
975 | case MRT_ADD_VIF: | |
976 | case MRT_DEL_VIF: | |
c354e124 | 977 | if (optlen != sizeof(vif)) |
132adf54 | 978 | return -EINVAL; |
c354e124 | 979 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
980 | return -EFAULT; |
981 | if (vif.vifc_vifi >= MAXVIFS) | |
982 | return -ENFILE; | |
983 | rtnl_lock(); | |
c354e124 | 984 | if (optname == MRT_ADD_VIF) { |
4feb88e5 | 985 | ret = vif_add(net, &vif, sk == net->ipv4.mroute_sk); |
132adf54 | 986 | } else { |
4feb88e5 | 987 | ret = vif_delete(net, vif.vifc_vifi, 0); |
132adf54 SH |
988 | } |
989 | rtnl_unlock(); | |
990 | return ret; | |
1da177e4 LT |
991 | |
992 | /* | |
993 | * Manipulate the forwarding caches. These live | |
994 | * in a sort of kernel/user symbiosis. | |
995 | */ | |
132adf54 SH |
996 | case MRT_ADD_MFC: |
997 | case MRT_DEL_MFC: | |
c354e124 | 998 | if (optlen != sizeof(mfc)) |
132adf54 | 999 | return -EINVAL; |
c354e124 | 1000 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
1001 | return -EFAULT; |
1002 | rtnl_lock(); | |
c354e124 | 1003 | if (optname == MRT_DEL_MFC) |
4feb88e5 | 1004 | ret = ipmr_mfc_delete(net, &mfc); |
132adf54 | 1005 | else |
4feb88e5 | 1006 | ret = ipmr_mfc_add(net, &mfc, sk == net->ipv4.mroute_sk); |
132adf54 SH |
1007 | rtnl_unlock(); |
1008 | return ret; | |
1da177e4 LT |
1009 | /* |
1010 | * Control PIM assert. | |
1011 | */ | |
132adf54 SH |
1012 | case MRT_ASSERT: |
1013 | { | |
1014 | int v; | |
1015 | if (get_user(v,(int __user *)optval)) | |
1016 | return -EFAULT; | |
4feb88e5 | 1017 | net->ipv4.mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1018 | return 0; |
1019 | } | |
1da177e4 | 1020 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1021 | case MRT_PIM: |
1022 | { | |
ba93ef74 SH |
1023 | int v; |
1024 | ||
132adf54 SH |
1025 | if (get_user(v,(int __user *)optval)) |
1026 | return -EFAULT; | |
ba93ef74 SH |
1027 | v = (v) ? 1 : 0; |
1028 | ||
132adf54 SH |
1029 | rtnl_lock(); |
1030 | ret = 0; | |
4feb88e5 BT |
1031 | if (v != net->ipv4.mroute_do_pim) { |
1032 | net->ipv4.mroute_do_pim = v; | |
1033 | net->ipv4.mroute_do_assert = v; | |
1da177e4 | 1034 | #ifdef CONFIG_IP_PIMSM_V2 |
4feb88e5 | 1035 | if (net->ipv4.mroute_do_pim) |
132adf54 SH |
1036 | ret = inet_add_protocol(&pim_protocol, |
1037 | IPPROTO_PIM); | |
1038 | else | |
1039 | ret = inet_del_protocol(&pim_protocol, | |
1040 | IPPROTO_PIM); | |
1041 | if (ret < 0) | |
1042 | ret = -EAGAIN; | |
1da177e4 | 1043 | #endif |
1da177e4 | 1044 | } |
132adf54 SH |
1045 | rtnl_unlock(); |
1046 | return ret; | |
1047 | } | |
1da177e4 | 1048 | #endif |
132adf54 SH |
1049 | /* |
1050 | * Spurious command, or MRT_VERSION which you cannot | |
1051 | * set. | |
1052 | */ | |
1053 | default: | |
1054 | return -ENOPROTOOPT; | |
1da177e4 LT |
1055 | } |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Getsock opt support for the multicast routing system. | |
1060 | */ | |
e905a9ed | 1061 | |
c354e124 | 1062 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1063 | { |
1064 | int olr; | |
1065 | int val; | |
4feb88e5 | 1066 | struct net *net = sock_net(sk); |
1da177e4 | 1067 | |
c354e124 | 1068 | if (optname != MRT_VERSION && |
1da177e4 LT |
1069 | #ifdef CONFIG_IP_PIMSM |
1070 | optname!=MRT_PIM && | |
1071 | #endif | |
1072 | optname!=MRT_ASSERT) | |
1073 | return -ENOPROTOOPT; | |
1074 | ||
1075 | if (get_user(olr, optlen)) | |
1076 | return -EFAULT; | |
1077 | ||
1078 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1079 | if (olr < 0) | |
1080 | return -EINVAL; | |
e905a9ed | 1081 | |
c354e124 | 1082 | if (put_user(olr, optlen)) |
1da177e4 | 1083 | return -EFAULT; |
c354e124 JK |
1084 | if (optname == MRT_VERSION) |
1085 | val = 0x0305; | |
1da177e4 | 1086 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1087 | else if (optname == MRT_PIM) |
4feb88e5 | 1088 | val = net->ipv4.mroute_do_pim; |
1da177e4 LT |
1089 | #endif |
1090 | else | |
4feb88e5 | 1091 | val = net->ipv4.mroute_do_assert; |
c354e124 | 1092 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1093 | return -EFAULT; |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * The IP multicast ioctl support routines. | |
1099 | */ | |
e905a9ed | 1100 | |
1da177e4 LT |
1101 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1102 | { | |
1103 | struct sioc_sg_req sr; | |
1104 | struct sioc_vif_req vr; | |
1105 | struct vif_device *vif; | |
1106 | struct mfc_cache *c; | |
4feb88e5 | 1107 | struct net *net = sock_net(sk); |
e905a9ed | 1108 | |
132adf54 SH |
1109 | switch (cmd) { |
1110 | case SIOCGETVIFCNT: | |
c354e124 | 1111 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1112 | return -EFAULT; |
4feb88e5 | 1113 | if (vr.vifi >= net->ipv4.maxvif) |
132adf54 SH |
1114 | return -EINVAL; |
1115 | read_lock(&mrt_lock); | |
4feb88e5 BT |
1116 | vif = &net->ipv4.vif_table[vr.vifi]; |
1117 | if (VIF_EXISTS(net, vr.vifi)) { | |
c354e124 JK |
1118 | vr.icount = vif->pkt_in; |
1119 | vr.ocount = vif->pkt_out; | |
1120 | vr.ibytes = vif->bytes_in; | |
1121 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1122 | read_unlock(&mrt_lock); |
1da177e4 | 1123 | |
c354e124 | 1124 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1125 | return -EFAULT; |
1126 | return 0; | |
1127 | } | |
1128 | read_unlock(&mrt_lock); | |
1129 | return -EADDRNOTAVAIL; | |
1130 | case SIOCGETSGCNT: | |
c354e124 | 1131 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1132 | return -EFAULT; |
1133 | ||
1134 | read_lock(&mrt_lock); | |
4feb88e5 | 1135 | c = ipmr_cache_find(net, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1136 | if (c) { |
1137 | sr.pktcnt = c->mfc_un.res.pkt; | |
1138 | sr.bytecnt = c->mfc_un.res.bytes; | |
1139 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1140 | read_unlock(&mrt_lock); |
132adf54 | 1141 | |
c354e124 | 1142 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1143 | return -EFAULT; |
1144 | return 0; | |
1145 | } | |
1146 | read_unlock(&mrt_lock); | |
1147 | return -EADDRNOTAVAIL; | |
1148 | default: | |
1149 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1150 | } |
1151 | } | |
1152 | ||
1153 | ||
1154 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1155 | { | |
e9dc8653 | 1156 | struct net_device *dev = ptr; |
4feb88e5 | 1157 | struct net *net = dev_net(dev); |
1da177e4 LT |
1158 | struct vif_device *v; |
1159 | int ct; | |
e9dc8653 | 1160 | |
4feb88e5 | 1161 | if (!net_eq(dev_net(dev), net)) |
e9dc8653 EB |
1162 | return NOTIFY_DONE; |
1163 | ||
1da177e4 LT |
1164 | if (event != NETDEV_UNREGISTER) |
1165 | return NOTIFY_DONE; | |
4feb88e5 BT |
1166 | v = &net->ipv4.vif_table[0]; |
1167 | for (ct = 0; ct < net->ipv4.maxvif; ct++, v++) { | |
c354e124 | 1168 | if (v->dev == dev) |
4feb88e5 | 1169 | vif_delete(net, ct, 1); |
1da177e4 LT |
1170 | } |
1171 | return NOTIFY_DONE; | |
1172 | } | |
1173 | ||
1174 | ||
c354e124 | 1175 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1176 | .notifier_call = ipmr_device_event, |
1177 | }; | |
1178 | ||
1179 | /* | |
1180 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1181 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1182 | * important for multicast video. | |
1183 | */ | |
e905a9ed | 1184 | |
114c7844 | 1185 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1186 | { |
8856dfa3 | 1187 | struct iphdr *iph; |
eddc9ec5 | 1188 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1189 | |
1190 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1191 | skb->transport_header = skb->network_header; |
8856dfa3 | 1192 | skb_reset_network_header(skb); |
eddc9ec5 | 1193 | iph = ip_hdr(skb); |
1da177e4 LT |
1194 | |
1195 | iph->version = 4; | |
e023dd64 ACM |
1196 | iph->tos = old_iph->tos; |
1197 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1198 | iph->frag_off = 0; |
1199 | iph->daddr = daddr; | |
1200 | iph->saddr = saddr; | |
1201 | iph->protocol = IPPROTO_IPIP; | |
1202 | iph->ihl = 5; | |
1203 | iph->tot_len = htons(skb->len); | |
1204 | ip_select_ident(iph, skb->dst, NULL); | |
1205 | ip_send_check(iph); | |
1206 | ||
1da177e4 LT |
1207 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1208 | nf_reset(skb); | |
1209 | } | |
1210 | ||
1211 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1212 | { | |
1213 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1214 | ||
7c73a6fa | 1215 | IP_INC_STATS_BH(dev_net(skb->dst->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1216 | |
1217 | if (unlikely(opt->optlen)) | |
1218 | ip_forward_options(skb); | |
1219 | ||
1220 | return dst_output(skb); | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * Processing handlers for ipmr_forward | |
1225 | */ | |
1226 | ||
1227 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1228 | { | |
4feb88e5 | 1229 | struct net *net = mfc_net(c); |
eddc9ec5 | 1230 | const struct iphdr *iph = ip_hdr(skb); |
4feb88e5 | 1231 | struct vif_device *vif = &net->ipv4.vif_table[vifi]; |
1da177e4 LT |
1232 | struct net_device *dev; |
1233 | struct rtable *rt; | |
1234 | int encap = 0; | |
1235 | ||
1236 | if (vif->dev == NULL) | |
1237 | goto out_free; | |
1238 | ||
1239 | #ifdef CONFIG_IP_PIMSM | |
1240 | if (vif->flags & VIFF_REGISTER) { | |
1241 | vif->pkt_out++; | |
c354e124 | 1242 | vif->bytes_out += skb->len; |
cf3677ae PE |
1243 | vif->dev->stats.tx_bytes += skb->len; |
1244 | vif->dev->stats.tx_packets++; | |
4feb88e5 | 1245 | ipmr_cache_report(net, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1246 | goto out_free; |
1da177e4 LT |
1247 | } |
1248 | #endif | |
1249 | ||
1250 | if (vif->flags&VIFF_TUNNEL) { | |
1251 | struct flowi fl = { .oif = vif->link, | |
1252 | .nl_u = { .ip4_u = | |
1253 | { .daddr = vif->remote, | |
1254 | .saddr = vif->local, | |
1255 | .tos = RT_TOS(iph->tos) } }, | |
1256 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1257 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1258 | goto out_free; |
1259 | encap = sizeof(struct iphdr); | |
1260 | } else { | |
1261 | struct flowi fl = { .oif = vif->link, | |
1262 | .nl_u = { .ip4_u = | |
1263 | { .daddr = iph->daddr, | |
1264 | .tos = RT_TOS(iph->tos) } }, | |
1265 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1266 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1267 | goto out_free; |
1268 | } | |
1269 | ||
1270 | dev = rt->u.dst.dev; | |
1271 | ||
1272 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1273 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1274 | allow to send ICMP, so that packets will disappear | |
1275 | to blackhole. | |
1276 | */ | |
1277 | ||
7c73a6fa | 1278 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1279 | ip_rt_put(rt); |
1280 | goto out_free; | |
1281 | } | |
1282 | ||
1283 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1284 | ||
1285 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1286 | ip_rt_put(rt); |
1da177e4 LT |
1287 | goto out_free; |
1288 | } | |
1289 | ||
1290 | vif->pkt_out++; | |
c354e124 | 1291 | vif->bytes_out += skb->len; |
1da177e4 LT |
1292 | |
1293 | dst_release(skb->dst); | |
1294 | skb->dst = &rt->u.dst; | |
eddc9ec5 | 1295 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1296 | |
1297 | /* FIXME: forward and output firewalls used to be called here. | |
1298 | * What do we do with netfilter? -- RR */ | |
1299 | if (vif->flags & VIFF_TUNNEL) { | |
1300 | ip_encap(skb, vif->local, vif->remote); | |
1301 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1302 | vif->dev->stats.tx_packets++; |
1303 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1304 | } |
1305 | ||
1306 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1307 | ||
1308 | /* | |
1309 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1310 | * not only before forwarding, but after forwarding on all output | |
1311 | * interfaces. It is clear, if mrouter runs a multicasting | |
1312 | * program, it should receive packets not depending to what interface | |
1313 | * program is joined. | |
1314 | * If we will not make it, the program will have to join on all | |
1315 | * interfaces. On the other hand, multihoming host (or router, but | |
1316 | * not mrouter) cannot join to more than one interface - it will | |
1317 | * result in receiving multiple packets. | |
1318 | */ | |
6e23ae2a | 1319 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1320 | ipmr_forward_finish); |
1321 | return; | |
1322 | ||
1323 | out_free: | |
1324 | kfree_skb(skb); | |
1325 | return; | |
1326 | } | |
1327 | ||
1328 | static int ipmr_find_vif(struct net_device *dev) | |
1329 | { | |
4feb88e5 | 1330 | struct net *net = dev_net(dev); |
1da177e4 | 1331 | int ct; |
4feb88e5 BT |
1332 | for (ct = net->ipv4.maxvif-1; ct >= 0; ct--) { |
1333 | if (net->ipv4.vif_table[ct].dev == dev) | |
1da177e4 LT |
1334 | break; |
1335 | } | |
1336 | return ct; | |
1337 | } | |
1338 | ||
1339 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1340 | ||
1341 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1342 | { | |
1343 | int psend = -1; | |
1344 | int vif, ct; | |
4feb88e5 | 1345 | struct net *net = mfc_net(cache); |
1da177e4 LT |
1346 | |
1347 | vif = cache->mfc_parent; | |
1348 | cache->mfc_un.res.pkt++; | |
1349 | cache->mfc_un.res.bytes += skb->len; | |
1350 | ||
1351 | /* | |
1352 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1353 | */ | |
4feb88e5 | 1354 | if (net->ipv4.vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1355 | int true_vifi; |
1356 | ||
ee6b9673 | 1357 | if (skb->rtable->fl.iif == 0) { |
1da177e4 LT |
1358 | /* It is our own packet, looped back. |
1359 | Very complicated situation... | |
1360 | ||
1361 | The best workaround until routing daemons will be | |
1362 | fixed is not to redistribute packet, if it was | |
1363 | send through wrong interface. It means, that | |
1364 | multicast applications WILL NOT work for | |
1365 | (S,G), which have default multicast route pointing | |
1366 | to wrong oif. In any case, it is not a good | |
1367 | idea to use multicasting applications on router. | |
1368 | */ | |
1369 | goto dont_forward; | |
1370 | } | |
1371 | ||
1372 | cache->mfc_un.res.wrong_if++; | |
1373 | true_vifi = ipmr_find_vif(skb->dev); | |
1374 | ||
4feb88e5 | 1375 | if (true_vifi >= 0 && net->ipv4.mroute_do_assert && |
1da177e4 LT |
1376 | /* pimsm uses asserts, when switching from RPT to SPT, |
1377 | so that we cannot check that packet arrived on an oif. | |
1378 | It is bad, but otherwise we would need to move pretty | |
1379 | large chunk of pimd to kernel. Ough... --ANK | |
1380 | */ | |
4feb88e5 | 1381 | (net->ipv4.mroute_do_pim || |
6f9374a9 | 1382 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1383 | time_after(jiffies, |
1da177e4 LT |
1384 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1385 | cache->mfc_un.res.last_assert = jiffies; | |
4feb88e5 | 1386 | ipmr_cache_report(net, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1387 | } |
1388 | goto dont_forward; | |
1389 | } | |
1390 | ||
4feb88e5 BT |
1391 | net->ipv4.vif_table[vif].pkt_in++; |
1392 | net->ipv4.vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1393 | |
1394 | /* | |
1395 | * Forward the frame | |
1396 | */ | |
1397 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1398 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1399 | if (psend != -1) { |
1400 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1401 | if (skb2) | |
1402 | ipmr_queue_xmit(skb2, cache, psend); | |
1403 | } | |
c354e124 | 1404 | psend = ct; |
1da177e4 LT |
1405 | } |
1406 | } | |
1407 | if (psend != -1) { | |
1408 | if (local) { | |
1409 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1410 | if (skb2) | |
1411 | ipmr_queue_xmit(skb2, cache, psend); | |
1412 | } else { | |
1413 | ipmr_queue_xmit(skb, cache, psend); | |
1414 | return 0; | |
1415 | } | |
1416 | } | |
1417 | ||
1418 | dont_forward: | |
1419 | if (!local) | |
1420 | kfree_skb(skb); | |
1421 | return 0; | |
1422 | } | |
1423 | ||
1424 | ||
1425 | /* | |
1426 | * Multicast packets for forwarding arrive here | |
1427 | */ | |
1428 | ||
1429 | int ip_mr_input(struct sk_buff *skb) | |
1430 | { | |
1431 | struct mfc_cache *cache; | |
4feb88e5 | 1432 | struct net *net = dev_net(skb->dev); |
ee6b9673 | 1433 | int local = skb->rtable->rt_flags&RTCF_LOCAL; |
1da177e4 LT |
1434 | |
1435 | /* Packet is looped back after forward, it should not be | |
1436 | forwarded second time, but still can be delivered locally. | |
1437 | */ | |
1438 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1439 | goto dont_forward; | |
1440 | ||
1441 | if (!local) { | |
1442 | if (IPCB(skb)->opt.router_alert) { | |
1443 | if (ip_call_ra_chain(skb)) | |
1444 | return 0; | |
eddc9ec5 | 1445 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1446 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1447 | Cisco IOS <= 11.2(8)) do not put router alert | |
1448 | option to IGMP packets destined to routable | |
1449 | groups. It is very bad, because it means | |
1450 | that we can forward NO IGMP messages. | |
1451 | */ | |
1452 | read_lock(&mrt_lock); | |
4feb88e5 | 1453 | if (net->ipv4.mroute_sk) { |
2715bcf9 | 1454 | nf_reset(skb); |
4feb88e5 | 1455 | raw_rcv(net->ipv4.mroute_sk, skb); |
1da177e4 LT |
1456 | read_unlock(&mrt_lock); |
1457 | return 0; | |
1458 | } | |
1459 | read_unlock(&mrt_lock); | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | read_lock(&mrt_lock); | |
4feb88e5 | 1464 | cache = ipmr_cache_find(net, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1465 | |
1466 | /* | |
1467 | * No usable cache entry | |
1468 | */ | |
c354e124 | 1469 | if (cache == NULL) { |
1da177e4 LT |
1470 | int vif; |
1471 | ||
1472 | if (local) { | |
1473 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1474 | ip_local_deliver(skb); | |
1475 | if (skb2 == NULL) { | |
1476 | read_unlock(&mrt_lock); | |
1477 | return -ENOBUFS; | |
1478 | } | |
1479 | skb = skb2; | |
1480 | } | |
1481 | ||
1482 | vif = ipmr_find_vif(skb->dev); | |
1483 | if (vif >= 0) { | |
4feb88e5 | 1484 | int err = ipmr_cache_unresolved(net, vif, skb); |
1da177e4 LT |
1485 | read_unlock(&mrt_lock); |
1486 | ||
1487 | return err; | |
1488 | } | |
1489 | read_unlock(&mrt_lock); | |
1490 | kfree_skb(skb); | |
1491 | return -ENODEV; | |
1492 | } | |
1493 | ||
1494 | ip_mr_forward(skb, cache, local); | |
1495 | ||
1496 | read_unlock(&mrt_lock); | |
1497 | ||
1498 | if (local) | |
1499 | return ip_local_deliver(skb); | |
1500 | ||
1501 | return 0; | |
1502 | ||
1503 | dont_forward: | |
1504 | if (local) | |
1505 | return ip_local_deliver(skb); | |
1506 | kfree_skb(skb); | |
1507 | return 0; | |
1508 | } | |
1509 | ||
b1879204 IJ |
1510 | #ifdef CONFIG_IP_PIMSM |
1511 | static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen) | |
1da177e4 | 1512 | { |
b1879204 IJ |
1513 | struct net_device *reg_dev = NULL; |
1514 | struct iphdr *encap; | |
4feb88e5 | 1515 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1516 | |
b1879204 | 1517 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1518 | /* |
1519 | Check that: | |
1520 | a. packet is really destinted to a multicast group | |
1521 | b. packet is not a NULL-REGISTER | |
1522 | c. packet is not truncated | |
1523 | */ | |
f97c1e0c | 1524 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1525 | encap->tot_len == 0 || |
b1879204 IJ |
1526 | ntohs(encap->tot_len) + pimlen > skb->len) |
1527 | return 1; | |
1da177e4 LT |
1528 | |
1529 | read_lock(&mrt_lock); | |
4feb88e5 BT |
1530 | if (net->ipv4.mroute_reg_vif_num >= 0) |
1531 | reg_dev = net->ipv4.vif_table[net->ipv4.mroute_reg_vif_num].dev; | |
1da177e4 LT |
1532 | if (reg_dev) |
1533 | dev_hold(reg_dev); | |
1534 | read_unlock(&mrt_lock); | |
1535 | ||
e905a9ed | 1536 | if (reg_dev == NULL) |
b1879204 | 1537 | return 1; |
1da177e4 | 1538 | |
b0e380b1 | 1539 | skb->mac_header = skb->network_header; |
1da177e4 | 1540 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1541 | skb_reset_network_header(skb); |
1da177e4 | 1542 | skb->dev = reg_dev; |
1da177e4 LT |
1543 | skb->protocol = htons(ETH_P_IP); |
1544 | skb->ip_summed = 0; | |
1545 | skb->pkt_type = PACKET_HOST; | |
1546 | dst_release(skb->dst); | |
1547 | skb->dst = NULL; | |
cf3677ae PE |
1548 | reg_dev->stats.rx_bytes += skb->len; |
1549 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1550 | nf_reset(skb); |
1551 | netif_rx(skb); | |
1552 | dev_put(reg_dev); | |
b1879204 | 1553 | |
1da177e4 | 1554 | return 0; |
b1879204 IJ |
1555 | } |
1556 | #endif | |
1557 | ||
1558 | #ifdef CONFIG_IP_PIMSM_V1 | |
1559 | /* | |
1560 | * Handle IGMP messages of PIMv1 | |
1561 | */ | |
1562 | ||
1563 | int pim_rcv_v1(struct sk_buff * skb) | |
1564 | { | |
1565 | struct igmphdr *pim; | |
4feb88e5 | 1566 | struct net *net = dev_net(skb->dev); |
b1879204 IJ |
1567 | |
1568 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1569 | goto drop; | |
1570 | ||
1571 | pim = igmp_hdr(skb); | |
1572 | ||
4feb88e5 | 1573 | if (!net->ipv4.mroute_do_pim || |
b1879204 IJ |
1574 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1575 | goto drop; | |
1576 | ||
1577 | if (__pim_rcv(skb, sizeof(*pim))) { | |
1578 | drop: | |
1579 | kfree_skb(skb); | |
1580 | } | |
1da177e4 LT |
1581 | return 0; |
1582 | } | |
1583 | #endif | |
1584 | ||
1585 | #ifdef CONFIG_IP_PIMSM_V2 | |
1586 | static int pim_rcv(struct sk_buff * skb) | |
1587 | { | |
1588 | struct pimreghdr *pim; | |
1da177e4 | 1589 | |
b1879204 | 1590 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1591 | goto drop; |
1592 | ||
9c70220b | 1593 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1594 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1595 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1596 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1597 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1598 | goto drop; |
1599 | ||
b1879204 IJ |
1600 | if (__pim_rcv(skb, sizeof(*pim))) { |
1601 | drop: | |
1602 | kfree_skb(skb); | |
1603 | } | |
1da177e4 LT |
1604 | return 0; |
1605 | } | |
1606 | #endif | |
1607 | ||
1608 | static int | |
1609 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1610 | { | |
1611 | int ct; | |
1612 | struct rtnexthop *nhp; | |
4feb88e5 BT |
1613 | struct net *net = mfc_net(c); |
1614 | struct net_device *dev = net->ipv4.vif_table[c->mfc_parent].dev; | |
27a884dc | 1615 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1616 | struct rtattr *mp_head; |
1617 | ||
1618 | if (dev) | |
1619 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1620 | ||
c354e124 | 1621 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1622 | |
1623 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1624 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1625 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1626 | goto rtattr_failure; | |
c354e124 | 1627 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1628 | nhp->rtnh_flags = 0; |
1629 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
4feb88e5 | 1630 | nhp->rtnh_ifindex = net->ipv4.vif_table[ct].dev->ifindex; |
1da177e4 LT |
1631 | nhp->rtnh_len = sizeof(*nhp); |
1632 | } | |
1633 | } | |
1634 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1635 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1636 | rtm->rtm_type = RTN_MULTICAST; |
1637 | return 1; | |
1638 | ||
1639 | rtattr_failure: | |
dc5fc579 | 1640 | nlmsg_trim(skb, b); |
1da177e4 LT |
1641 | return -EMSGSIZE; |
1642 | } | |
1643 | ||
4feb88e5 BT |
1644 | int ipmr_get_route(struct net *net, |
1645 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1da177e4 LT |
1646 | { |
1647 | int err; | |
1648 | struct mfc_cache *cache; | |
ee6b9673 | 1649 | struct rtable *rt = skb->rtable; |
1da177e4 LT |
1650 | |
1651 | read_lock(&mrt_lock); | |
4feb88e5 | 1652 | cache = ipmr_cache_find(net, rt->rt_src, rt->rt_dst); |
1da177e4 | 1653 | |
c354e124 | 1654 | if (cache == NULL) { |
72287490 | 1655 | struct sk_buff *skb2; |
eddc9ec5 | 1656 | struct iphdr *iph; |
1da177e4 LT |
1657 | struct net_device *dev; |
1658 | int vif; | |
1659 | ||
1660 | if (nowait) { | |
1661 | read_unlock(&mrt_lock); | |
1662 | return -EAGAIN; | |
1663 | } | |
1664 | ||
1665 | dev = skb->dev; | |
1666 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1667 | read_unlock(&mrt_lock); | |
1668 | return -ENODEV; | |
1669 | } | |
72287490 AK |
1670 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1671 | if (!skb2) { | |
1672 | read_unlock(&mrt_lock); | |
1673 | return -ENOMEM; | |
1674 | } | |
1675 | ||
e2d1bca7 ACM |
1676 | skb_push(skb2, sizeof(struct iphdr)); |
1677 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1678 | iph = ip_hdr(skb2); |
1679 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1680 | iph->saddr = rt->rt_src; | |
1681 | iph->daddr = rt->rt_dst; | |
1682 | iph->version = 0; | |
4feb88e5 | 1683 | err = ipmr_cache_unresolved(net, vif, skb2); |
1da177e4 LT |
1684 | read_unlock(&mrt_lock); |
1685 | return err; | |
1686 | } | |
1687 | ||
1688 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1689 | cache->mfc_flags |= MFC_NOTIFY; | |
1690 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1691 | read_unlock(&mrt_lock); | |
1692 | return err; | |
1693 | } | |
1694 | ||
e905a9ed | 1695 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1696 | /* |
1697 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1698 | */ | |
1699 | struct ipmr_vif_iter { | |
f6bb4514 | 1700 | struct seq_net_private p; |
1da177e4 LT |
1701 | int ct; |
1702 | }; | |
1703 | ||
f6bb4514 BT |
1704 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
1705 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
1706 | loff_t pos) |
1707 | { | |
f6bb4514 BT |
1708 | for (iter->ct = 0; iter->ct < net->ipv4.maxvif; ++iter->ct) { |
1709 | if (!VIF_EXISTS(net, iter->ct)) | |
1da177e4 | 1710 | continue; |
e905a9ed | 1711 | if (pos-- == 0) |
f6bb4514 | 1712 | return &net->ipv4.vif_table[iter->ct]; |
1da177e4 LT |
1713 | } |
1714 | return NULL; | |
1715 | } | |
1716 | ||
1717 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 1718 | __acquires(mrt_lock) |
1da177e4 | 1719 | { |
f6bb4514 BT |
1720 | struct net *net = seq_file_net(seq); |
1721 | ||
1da177e4 | 1722 | read_lock(&mrt_lock); |
f6bb4514 | 1723 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
1724 | : SEQ_START_TOKEN; |
1725 | } | |
1726 | ||
1727 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1728 | { | |
1729 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 1730 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1731 | |
1732 | ++*pos; | |
1733 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 1734 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 1735 | |
f6bb4514 BT |
1736 | while (++iter->ct < net->ipv4.maxvif) { |
1737 | if (!VIF_EXISTS(net, iter->ct)) | |
1da177e4 | 1738 | continue; |
f6bb4514 | 1739 | return &net->ipv4.vif_table[iter->ct]; |
1da177e4 LT |
1740 | } |
1741 | return NULL; | |
1742 | } | |
1743 | ||
1744 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 1745 | __releases(mrt_lock) |
1da177e4 LT |
1746 | { |
1747 | read_unlock(&mrt_lock); | |
1748 | } | |
1749 | ||
1750 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1751 | { | |
f6bb4514 BT |
1752 | struct net *net = seq_file_net(seq); |
1753 | ||
1da177e4 | 1754 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 1755 | seq_puts(seq, |
1da177e4 LT |
1756 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1757 | } else { | |
1758 | const struct vif_device *vif = v; | |
1759 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1760 | ||
1761 | seq_printf(seq, | |
1762 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
f6bb4514 | 1763 | vif - net->ipv4.vif_table, |
e905a9ed | 1764 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1765 | vif->bytes_out, vif->pkt_out, |
1766 | vif->flags, vif->local, vif->remote); | |
1767 | } | |
1768 | return 0; | |
1769 | } | |
1770 | ||
f690808e | 1771 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1772 | .start = ipmr_vif_seq_start, |
1773 | .next = ipmr_vif_seq_next, | |
1774 | .stop = ipmr_vif_seq_stop, | |
1775 | .show = ipmr_vif_seq_show, | |
1776 | }; | |
1777 | ||
1778 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1779 | { | |
f6bb4514 BT |
1780 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
1781 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
1782 | } |
1783 | ||
9a32144e | 1784 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1785 | .owner = THIS_MODULE, |
1786 | .open = ipmr_vif_open, | |
1787 | .read = seq_read, | |
1788 | .llseek = seq_lseek, | |
f6bb4514 | 1789 | .release = seq_release_net, |
1da177e4 LT |
1790 | }; |
1791 | ||
1792 | struct ipmr_mfc_iter { | |
f6bb4514 | 1793 | struct seq_net_private p; |
1da177e4 LT |
1794 | struct mfc_cache **cache; |
1795 | int ct; | |
1796 | }; | |
1797 | ||
1798 | ||
f6bb4514 BT |
1799 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
1800 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 LT |
1801 | { |
1802 | struct mfc_cache *mfc; | |
1803 | ||
f6bb4514 | 1804 | it->cache = net->ipv4.mfc_cache_array; |
1da177e4 | 1805 | read_lock(&mrt_lock); |
e905a9ed | 1806 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
f6bb4514 | 1807 | for (mfc = net->ipv4.mfc_cache_array[it->ct]; |
2bb8b26c | 1808 | mfc; mfc = mfc->next) |
e905a9ed | 1809 | if (pos-- == 0) |
1da177e4 LT |
1810 | return mfc; |
1811 | read_unlock(&mrt_lock); | |
1812 | ||
1813 | it->cache = &mfc_unres_queue; | |
1814 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1815 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
f6bb4514 BT |
1816 | if (net_eq(mfc_net(mfc), net) && |
1817 | pos-- == 0) | |
1da177e4 LT |
1818 | return mfc; |
1819 | spin_unlock_bh(&mfc_unres_lock); | |
1820 | ||
1821 | it->cache = NULL; | |
1822 | return NULL; | |
1823 | } | |
1824 | ||
1825 | ||
1826 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1827 | { | |
1828 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 BT |
1829 | struct net *net = seq_file_net(seq); |
1830 | ||
1da177e4 LT |
1831 | it->cache = NULL; |
1832 | it->ct = 0; | |
f6bb4514 | 1833 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
1834 | : SEQ_START_TOKEN; |
1835 | } | |
1836 | ||
1837 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1838 | { | |
1839 | struct mfc_cache *mfc = v; | |
1840 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 1841 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1842 | |
1843 | ++*pos; | |
1844 | ||
1845 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 1846 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 LT |
1847 | |
1848 | if (mfc->next) | |
1849 | return mfc->next; | |
e905a9ed YH |
1850 | |
1851 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1852 | goto end_of_list; |
1853 | ||
f6bb4514 | 1854 | BUG_ON(it->cache != net->ipv4.mfc_cache_array); |
1da177e4 LT |
1855 | |
1856 | while (++it->ct < MFC_LINES) { | |
f6bb4514 | 1857 | mfc = net->ipv4.mfc_cache_array[it->ct]; |
1da177e4 LT |
1858 | if (mfc) |
1859 | return mfc; | |
1860 | } | |
1861 | ||
1862 | /* exhausted cache_array, show unresolved */ | |
1863 | read_unlock(&mrt_lock); | |
1864 | it->cache = &mfc_unres_queue; | |
1865 | it->ct = 0; | |
e905a9ed | 1866 | |
1da177e4 LT |
1867 | spin_lock_bh(&mfc_unres_lock); |
1868 | mfc = mfc_unres_queue; | |
f6bb4514 BT |
1869 | while (mfc && !net_eq(mfc_net(mfc), net)) |
1870 | mfc = mfc->next; | |
e905a9ed | 1871 | if (mfc) |
1da177e4 LT |
1872 | return mfc; |
1873 | ||
1874 | end_of_list: | |
1875 | spin_unlock_bh(&mfc_unres_lock); | |
1876 | it->cache = NULL; | |
1877 | ||
1878 | return NULL; | |
1879 | } | |
1880 | ||
1881 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1882 | { | |
1883 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 1884 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1885 | |
1886 | if (it->cache == &mfc_unres_queue) | |
1887 | spin_unlock_bh(&mfc_unres_lock); | |
f6bb4514 | 1888 | else if (it->cache == net->ipv4.mfc_cache_array) |
1da177e4 LT |
1889 | read_unlock(&mrt_lock); |
1890 | } | |
1891 | ||
1892 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1893 | { | |
1894 | int n; | |
f6bb4514 | 1895 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1896 | |
1897 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1898 | seq_puts(seq, |
1da177e4 LT |
1899 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1900 | } else { | |
1901 | const struct mfc_cache *mfc = v; | |
1902 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1903 | |
999890b2 | 1904 | seq_printf(seq, "%08lX %08lX %-3hd", |
1da177e4 LT |
1905 | (unsigned long) mfc->mfc_mcastgrp, |
1906 | (unsigned long) mfc->mfc_origin, | |
1ea472e2 | 1907 | mfc->mfc_parent); |
1da177e4 LT |
1908 | |
1909 | if (it->cache != &mfc_unres_queue) { | |
1ea472e2 BT |
1910 | seq_printf(seq, " %8lu %8lu %8lu", |
1911 | mfc->mfc_un.res.pkt, | |
1912 | mfc->mfc_un.res.bytes, | |
1913 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
1914 | for (n = mfc->mfc_un.res.minvif; |
1915 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
f6bb4514 | 1916 | if (VIF_EXISTS(net, n) && |
cf958ae3 BT |
1917 | mfc->mfc_un.res.ttls[n] < 255) |
1918 | seq_printf(seq, | |
e905a9ed | 1919 | " %2d:%-3d", |
1da177e4 LT |
1920 | n, mfc->mfc_un.res.ttls[n]); |
1921 | } | |
1ea472e2 BT |
1922 | } else { |
1923 | /* unresolved mfc_caches don't contain | |
1924 | * pkt, bytes and wrong_if values | |
1925 | */ | |
1926 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
1927 | } |
1928 | seq_putc(seq, '\n'); | |
1929 | } | |
1930 | return 0; | |
1931 | } | |
1932 | ||
f690808e | 1933 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1934 | .start = ipmr_mfc_seq_start, |
1935 | .next = ipmr_mfc_seq_next, | |
1936 | .stop = ipmr_mfc_seq_stop, | |
1937 | .show = ipmr_mfc_seq_show, | |
1938 | }; | |
1939 | ||
1940 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1941 | { | |
f6bb4514 BT |
1942 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
1943 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
1944 | } |
1945 | ||
9a32144e | 1946 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1947 | .owner = THIS_MODULE, |
1948 | .open = ipmr_mfc_open, | |
1949 | .read = seq_read, | |
1950 | .llseek = seq_lseek, | |
f6bb4514 | 1951 | .release = seq_release_net, |
1da177e4 | 1952 | }; |
e905a9ed | 1953 | #endif |
1da177e4 LT |
1954 | |
1955 | #ifdef CONFIG_IP_PIMSM_V2 | |
1956 | static struct net_protocol pim_protocol = { | |
1957 | .handler = pim_rcv, | |
1958 | }; | |
1959 | #endif | |
1960 | ||
1961 | ||
1962 | /* | |
1963 | * Setup for IP multicast routing | |
1964 | */ | |
cf958ae3 BT |
1965 | static int __net_init ipmr_net_init(struct net *net) |
1966 | { | |
1967 | int err = 0; | |
1968 | ||
1969 | net->ipv4.vif_table = kcalloc(MAXVIFS, sizeof(struct vif_device), | |
1970 | GFP_KERNEL); | |
1971 | if (!net->ipv4.vif_table) { | |
1972 | err = -ENOMEM; | |
1973 | goto fail; | |
1974 | } | |
2bb8b26c BT |
1975 | |
1976 | /* Forwarding cache */ | |
1977 | net->ipv4.mfc_cache_array = kcalloc(MFC_LINES, | |
1978 | sizeof(struct mfc_cache *), | |
1979 | GFP_KERNEL); | |
1980 | if (!net->ipv4.mfc_cache_array) { | |
1981 | err = -ENOMEM; | |
1982 | goto fail_mfc_cache; | |
1983 | } | |
6c5143db BT |
1984 | |
1985 | #ifdef CONFIG_IP_PIMSM | |
1986 | net->ipv4.mroute_reg_vif_num = -1; | |
1987 | #endif | |
f6bb4514 BT |
1988 | |
1989 | #ifdef CONFIG_PROC_FS | |
1990 | err = -ENOMEM; | |
1991 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
1992 | goto proc_vif_fail; | |
1993 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
1994 | goto proc_cache_fail; | |
1995 | #endif | |
2bb8b26c BT |
1996 | return 0; |
1997 | ||
f6bb4514 BT |
1998 | #ifdef CONFIG_PROC_FS |
1999 | proc_cache_fail: | |
2000 | proc_net_remove(net, "ip_mr_vif"); | |
2001 | proc_vif_fail: | |
2002 | kfree(net->ipv4.mfc_cache_array); | |
2003 | #endif | |
2bb8b26c BT |
2004 | fail_mfc_cache: |
2005 | kfree(net->ipv4.vif_table); | |
cf958ae3 BT |
2006 | fail: |
2007 | return err; | |
2008 | } | |
2009 | ||
2010 | static void __net_exit ipmr_net_exit(struct net *net) | |
2011 | { | |
f6bb4514 BT |
2012 | #ifdef CONFIG_PROC_FS |
2013 | proc_net_remove(net, "ip_mr_cache"); | |
2014 | proc_net_remove(net, "ip_mr_vif"); | |
2015 | #endif | |
2bb8b26c | 2016 | kfree(net->ipv4.mfc_cache_array); |
cf958ae3 BT |
2017 | kfree(net->ipv4.vif_table); |
2018 | } | |
2019 | ||
2020 | static struct pernet_operations ipmr_net_ops = { | |
2021 | .init = ipmr_net_init, | |
2022 | .exit = ipmr_net_exit, | |
2023 | }; | |
e905a9ed | 2024 | |
03d2f897 | 2025 | int __init ip_mr_init(void) |
1da177e4 | 2026 | { |
03d2f897 WC |
2027 | int err; |
2028 | ||
1da177e4 LT |
2029 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2030 | sizeof(struct mfc_cache), | |
e5d679f3 | 2031 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2032 | NULL); |
03d2f897 WC |
2033 | if (!mrt_cachep) |
2034 | return -ENOMEM; | |
2035 | ||
cf958ae3 BT |
2036 | err = register_pernet_subsys(&ipmr_net_ops); |
2037 | if (err) | |
2038 | goto reg_pernet_fail; | |
2039 | ||
b24b8a24 | 2040 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
03d2f897 WC |
2041 | err = register_netdevice_notifier(&ip_mr_notifier); |
2042 | if (err) | |
2043 | goto reg_notif_fail; | |
03d2f897 | 2044 | return 0; |
f6bb4514 | 2045 | |
c3e38896 BT |
2046 | reg_notif_fail: |
2047 | del_timer(&ipmr_expire_timer); | |
cf958ae3 BT |
2048 | unregister_pernet_subsys(&ipmr_net_ops); |
2049 | reg_pernet_fail: | |
c3e38896 | 2050 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2051 | return err; |
1da177e4 | 2052 | } |