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> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
457c4cbc | 51 | #include <net/net_namespace.h> |
1da177e4 LT |
52 | #include <net/ip.h> |
53 | #include <net/protocol.h> | |
54 | #include <linux/skbuff.h> | |
14c85021 | 55 | #include <net/route.h> |
1da177e4 LT |
56 | #include <net/sock.h> |
57 | #include <net/icmp.h> | |
58 | #include <net/udp.h> | |
59 | #include <net/raw.h> | |
60 | #include <linux/notifier.h> | |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/netfilter_ipv4.h> | |
63 | #include <net/ipip.h> | |
64 | #include <net/checksum.h> | |
dc5fc579 | 65 | #include <net/netlink.h> |
1da177e4 LT |
66 | |
67 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
68 | #define CONFIG_IP_PIMSM 1 | |
69 | #endif | |
70 | ||
1da177e4 LT |
71 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
72 | Note that the changes are semaphored via rtnl_lock. | |
73 | */ | |
74 | ||
75 | static DEFINE_RWLOCK(mrt_lock); | |
76 | ||
77 | /* | |
78 | * Multicast router control variables | |
79 | */ | |
80 | ||
cf958ae3 | 81 | #define VIF_EXISTS(_net, _idx) ((_net)->ipv4.vif_table[_idx].dev != NULL) |
1da177e4 | 82 | |
1da177e4 | 83 | static struct mfc_cache *mfc_unres_queue; /* Queue of unresolved entries */ |
1da177e4 LT |
84 | |
85 | /* Special spinlock for queue of unresolved entries */ | |
86 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
87 | ||
88 | /* We return to original Alan's scheme. Hash table of resolved | |
89 | entries is changed only in process context and protected | |
90 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
91 | with strong spinlock mfc_unres_lock. | |
92 | ||
93 | In this case data path is free of exclusive locks at all. | |
94 | */ | |
95 | ||
e18b890b | 96 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 LT |
97 | |
98 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local); | |
4feb88e5 BT |
99 | static int ipmr_cache_report(struct net *net, |
100 | struct sk_buff *pkt, vifi_t vifi, int assert); | |
1da177e4 LT |
101 | static int ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm); |
102 | ||
1da177e4 LT |
103 | static struct timer_list ipmr_expire_timer; |
104 | ||
105 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
106 | ||
d607032d WC |
107 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
108 | { | |
4feb88e5 BT |
109 | struct net *net = dev_net(dev); |
110 | ||
d607032d WC |
111 | dev_close(dev); |
112 | ||
4feb88e5 | 113 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 114 | if (dev) { |
5bc3eb7e | 115 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 116 | struct ifreq ifr; |
d607032d WC |
117 | struct ip_tunnel_parm p; |
118 | ||
119 | memset(&p, 0, sizeof(p)); | |
120 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
121 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
122 | p.iph.version = 4; | |
123 | p.iph.ihl = 5; | |
124 | p.iph.protocol = IPPROTO_IPIP; | |
125 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
126 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
127 | ||
5bc3eb7e SH |
128 | if (ops->ndo_do_ioctl) { |
129 | mm_segment_t oldfs = get_fs(); | |
130 | ||
131 | set_fs(KERNEL_DS); | |
132 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
133 | set_fs(oldfs); | |
134 | } | |
d607032d WC |
135 | } |
136 | } | |
137 | ||
1da177e4 | 138 | static |
4feb88e5 | 139 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
140 | { |
141 | struct net_device *dev; | |
142 | ||
4feb88e5 | 143 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
144 | |
145 | if (dev) { | |
5bc3eb7e | 146 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
147 | int err; |
148 | struct ifreq ifr; | |
1da177e4 LT |
149 | struct ip_tunnel_parm p; |
150 | struct in_device *in_dev; | |
151 | ||
152 | memset(&p, 0, sizeof(p)); | |
153 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
154 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
155 | p.iph.version = 4; | |
156 | p.iph.ihl = 5; | |
157 | p.iph.protocol = IPPROTO_IPIP; | |
158 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 159 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 160 | |
5bc3eb7e SH |
161 | if (ops->ndo_do_ioctl) { |
162 | mm_segment_t oldfs = get_fs(); | |
163 | ||
164 | set_fs(KERNEL_DS); | |
165 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
166 | set_fs(oldfs); | |
167 | } else | |
168 | err = -EOPNOTSUPP; | |
1da177e4 LT |
169 | |
170 | dev = NULL; | |
171 | ||
4feb88e5 BT |
172 | if (err == 0 && |
173 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
174 | dev->flags |= IFF_MULTICAST; |
175 | ||
e5ed6399 | 176 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 177 | if (in_dev == NULL) |
1da177e4 | 178 | goto failure; |
71e27da9 HX |
179 | |
180 | ipv4_devconf_setall(in_dev); | |
181 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
182 | |
183 | if (dev_open(dev)) | |
184 | goto failure; | |
7dc00c82 | 185 | dev_hold(dev); |
1da177e4 LT |
186 | } |
187 | } | |
188 | return dev; | |
189 | ||
190 | failure: | |
191 | /* allow the register to be completed before unregistering. */ | |
192 | rtnl_unlock(); | |
193 | rtnl_lock(); | |
194 | ||
195 | unregister_netdevice(dev); | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | #ifdef CONFIG_IP_PIMSM | |
200 | ||
6fef4c0c | 201 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 202 | { |
4feb88e5 BT |
203 | struct net *net = dev_net(dev); |
204 | ||
1da177e4 | 205 | read_lock(&mrt_lock); |
cf3677ae PE |
206 | dev->stats.tx_bytes += skb->len; |
207 | dev->stats.tx_packets++; | |
4feb88e5 BT |
208 | ipmr_cache_report(net, skb, net->ipv4.mroute_reg_vif_num, |
209 | IGMPMSG_WHOLEPKT); | |
1da177e4 LT |
210 | read_unlock(&mrt_lock); |
211 | kfree_skb(skb); | |
6ed10654 | 212 | return NETDEV_TX_OK; |
1da177e4 LT |
213 | } |
214 | ||
007c3838 SH |
215 | static const struct net_device_ops reg_vif_netdev_ops = { |
216 | .ndo_start_xmit = reg_vif_xmit, | |
217 | }; | |
218 | ||
1da177e4 LT |
219 | static void reg_vif_setup(struct net_device *dev) |
220 | { | |
221 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 222 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 223 | dev->flags = IFF_NOARP; |
007c3838 | 224 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 | 225 | dev->destructor = free_netdev; |
403dbb97 | 226 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
227 | } |
228 | ||
403dbb97 | 229 | static struct net_device *ipmr_reg_vif(struct net *net) |
1da177e4 LT |
230 | { |
231 | struct net_device *dev; | |
232 | struct in_device *in_dev; | |
233 | ||
cf3677ae | 234 | dev = alloc_netdev(0, "pimreg", reg_vif_setup); |
1da177e4 LT |
235 | |
236 | if (dev == NULL) | |
237 | return NULL; | |
238 | ||
403dbb97 TG |
239 | dev_net_set(dev, net); |
240 | ||
1da177e4 LT |
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 | |
d17fa6fa ED |
279 | static int vif_delete(struct net *net, int vifi, int notify, |
280 | struct list_head *head) | |
1da177e4 LT |
281 | { |
282 | struct vif_device *v; | |
283 | struct net_device *dev; | |
284 | struct in_device *in_dev; | |
285 | ||
4feb88e5 | 286 | if (vifi < 0 || vifi >= net->ipv4.maxvif) |
1da177e4 LT |
287 | return -EADDRNOTAVAIL; |
288 | ||
4feb88e5 | 289 | v = &net->ipv4.vif_table[vifi]; |
1da177e4 LT |
290 | |
291 | write_lock_bh(&mrt_lock); | |
292 | dev = v->dev; | |
293 | v->dev = NULL; | |
294 | ||
295 | if (!dev) { | |
296 | write_unlock_bh(&mrt_lock); | |
297 | return -EADDRNOTAVAIL; | |
298 | } | |
299 | ||
300 | #ifdef CONFIG_IP_PIMSM | |
4feb88e5 BT |
301 | if (vifi == net->ipv4.mroute_reg_vif_num) |
302 | net->ipv4.mroute_reg_vif_num = -1; | |
1da177e4 LT |
303 | #endif |
304 | ||
4feb88e5 | 305 | if (vifi+1 == net->ipv4.maxvif) { |
1da177e4 LT |
306 | int tmp; |
307 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
4feb88e5 | 308 | if (VIF_EXISTS(net, tmp)) |
1da177e4 LT |
309 | break; |
310 | } | |
4feb88e5 | 311 | net->ipv4.maxvif = tmp+1; |
1da177e4 LT |
312 | } |
313 | ||
314 | write_unlock_bh(&mrt_lock); | |
315 | ||
316 | dev_set_allmulti(dev, -1); | |
317 | ||
e5ed6399 | 318 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 319 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
320 | ip_rt_multicast_event(in_dev); |
321 | } | |
322 | ||
7dc00c82 | 323 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
d17fa6fa | 324 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
325 | |
326 | dev_put(dev); | |
327 | return 0; | |
328 | } | |
329 | ||
5c0a66f5 BT |
330 | static inline void ipmr_cache_free(struct mfc_cache *c) |
331 | { | |
332 | release_net(mfc_net(c)); | |
333 | kmem_cache_free(mrt_cachep, c); | |
334 | } | |
335 | ||
1da177e4 LT |
336 | /* Destroy an unresolved cache entry, killing queued skbs |
337 | and reporting error to netlink readers. | |
338 | */ | |
339 | ||
340 | static void ipmr_destroy_unres(struct mfc_cache *c) | |
341 | { | |
342 | struct sk_buff *skb; | |
9ef1d4c7 | 343 | struct nlmsgerr *e; |
4feb88e5 | 344 | struct net *net = mfc_net(c); |
1da177e4 | 345 | |
4feb88e5 | 346 | atomic_dec(&net->ipv4.cache_resolve_queue_len); |
1da177e4 | 347 | |
c354e124 | 348 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 349 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
350 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
351 | nlh->nlmsg_type = NLMSG_ERROR; | |
352 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
353 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
354 | e = NLMSG_DATA(nlh); |
355 | e->error = -ETIMEDOUT; | |
356 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 357 | |
4feb88e5 | 358 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 LT |
359 | } else |
360 | kfree_skb(skb); | |
361 | } | |
362 | ||
5c0a66f5 | 363 | ipmr_cache_free(c); |
1da177e4 LT |
364 | } |
365 | ||
366 | ||
367 | /* Single timer process for all the unresolved queue. */ | |
368 | ||
369 | static void ipmr_expire_process(unsigned long dummy) | |
370 | { | |
371 | unsigned long now; | |
372 | unsigned long expires; | |
373 | struct mfc_cache *c, **cp; | |
374 | ||
375 | if (!spin_trylock(&mfc_unres_lock)) { | |
376 | mod_timer(&ipmr_expire_timer, jiffies+HZ/10); | |
377 | return; | |
378 | } | |
379 | ||
1e8fb3b6 | 380 | if (mfc_unres_queue == NULL) |
1da177e4 LT |
381 | goto out; |
382 | ||
383 | now = jiffies; | |
384 | expires = 10*HZ; | |
385 | cp = &mfc_unres_queue; | |
386 | ||
387 | while ((c=*cp) != NULL) { | |
388 | if (time_after(c->mfc_un.unres.expires, now)) { | |
389 | unsigned long interval = c->mfc_un.unres.expires - now; | |
390 | if (interval < expires) | |
391 | expires = interval; | |
392 | cp = &c->next; | |
393 | continue; | |
394 | } | |
395 | ||
396 | *cp = c->next; | |
397 | ||
398 | ipmr_destroy_unres(c); | |
399 | } | |
400 | ||
1e8fb3b6 | 401 | if (mfc_unres_queue != NULL) |
1da177e4 LT |
402 | mod_timer(&ipmr_expire_timer, jiffies + expires); |
403 | ||
404 | out: | |
405 | spin_unlock(&mfc_unres_lock); | |
406 | } | |
407 | ||
408 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
409 | ||
d1b04c08 | 410 | static void ipmr_update_thresholds(struct mfc_cache *cache, unsigned char *ttls) |
1da177e4 LT |
411 | { |
412 | int vifi; | |
4feb88e5 | 413 | struct net *net = mfc_net(cache); |
1da177e4 LT |
414 | |
415 | cache->mfc_un.res.minvif = MAXVIFS; | |
416 | cache->mfc_un.res.maxvif = 0; | |
417 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
418 | ||
4feb88e5 BT |
419 | for (vifi = 0; vifi < net->ipv4.maxvif; vifi++) { |
420 | if (VIF_EXISTS(net, vifi) && | |
cf958ae3 | 421 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
422 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
423 | if (cache->mfc_un.res.minvif > vifi) | |
424 | cache->mfc_un.res.minvif = vifi; | |
425 | if (cache->mfc_un.res.maxvif <= vifi) | |
426 | cache->mfc_un.res.maxvif = vifi + 1; | |
427 | } | |
428 | } | |
429 | } | |
430 | ||
4feb88e5 | 431 | static int vif_add(struct net *net, struct vifctl *vifc, int mrtsock) |
1da177e4 LT |
432 | { |
433 | int vifi = vifc->vifc_vifi; | |
4feb88e5 | 434 | struct vif_device *v = &net->ipv4.vif_table[vifi]; |
1da177e4 LT |
435 | struct net_device *dev; |
436 | struct in_device *in_dev; | |
d607032d | 437 | int err; |
1da177e4 LT |
438 | |
439 | /* Is vif busy ? */ | |
4feb88e5 | 440 | if (VIF_EXISTS(net, vifi)) |
1da177e4 LT |
441 | return -EADDRINUSE; |
442 | ||
443 | switch (vifc->vifc_flags) { | |
444 | #ifdef CONFIG_IP_PIMSM | |
445 | case VIFF_REGISTER: | |
446 | /* | |
447 | * Special Purpose VIF in PIM | |
448 | * All the packets will be sent to the daemon | |
449 | */ | |
4feb88e5 | 450 | if (net->ipv4.mroute_reg_vif_num >= 0) |
1da177e4 | 451 | return -EADDRINUSE; |
403dbb97 | 452 | dev = ipmr_reg_vif(net); |
1da177e4 LT |
453 | if (!dev) |
454 | return -ENOBUFS; | |
d607032d WC |
455 | err = dev_set_allmulti(dev, 1); |
456 | if (err) { | |
457 | unregister_netdevice(dev); | |
7dc00c82 | 458 | dev_put(dev); |
d607032d WC |
459 | return err; |
460 | } | |
1da177e4 LT |
461 | break; |
462 | #endif | |
e905a9ed | 463 | case VIFF_TUNNEL: |
4feb88e5 | 464 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
465 | if (!dev) |
466 | return -ENOBUFS; | |
d607032d WC |
467 | err = dev_set_allmulti(dev, 1); |
468 | if (err) { | |
469 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 470 | dev_put(dev); |
d607032d WC |
471 | return err; |
472 | } | |
1da177e4 | 473 | break; |
ee5e81f0 I |
474 | |
475 | case VIFF_USE_IFINDEX: | |
1da177e4 | 476 | case 0: |
ee5e81f0 I |
477 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
478 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
479 | if (dev && dev->ip_ptr == NULL) { | |
480 | dev_put(dev); | |
481 | return -EADDRNOTAVAIL; | |
482 | } | |
483 | } else | |
484 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); | |
485 | ||
1da177e4 LT |
486 | if (!dev) |
487 | return -EADDRNOTAVAIL; | |
d607032d | 488 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
489 | if (err) { |
490 | dev_put(dev); | |
d607032d | 491 | return err; |
7dc00c82 | 492 | } |
1da177e4 LT |
493 | break; |
494 | default: | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
d0490cfd DC |
498 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
499 | dev_put(dev); | |
1da177e4 | 500 | return -EADDRNOTAVAIL; |
d0490cfd | 501 | } |
42f811b8 | 502 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
503 | ip_rt_multicast_event(in_dev); |
504 | ||
505 | /* | |
506 | * Fill in the VIF structures | |
507 | */ | |
c354e124 JK |
508 | v->rate_limit = vifc->vifc_rate_limit; |
509 | v->local = vifc->vifc_lcl_addr.s_addr; | |
510 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
511 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
512 | if (!mrtsock) |
513 | v->flags |= VIFF_STATIC; | |
c354e124 | 514 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
515 | v->bytes_in = 0; |
516 | v->bytes_out = 0; | |
517 | v->pkt_in = 0; | |
518 | v->pkt_out = 0; | |
519 | v->link = dev->ifindex; | |
520 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
521 | v->link = dev->iflink; | |
522 | ||
523 | /* And finish update writing critical data */ | |
524 | write_lock_bh(&mrt_lock); | |
c354e124 | 525 | v->dev = dev; |
1da177e4 LT |
526 | #ifdef CONFIG_IP_PIMSM |
527 | if (v->flags&VIFF_REGISTER) | |
4feb88e5 | 528 | net->ipv4.mroute_reg_vif_num = vifi; |
1da177e4 | 529 | #endif |
4feb88e5 BT |
530 | if (vifi+1 > net->ipv4.maxvif) |
531 | net->ipv4.maxvif = vifi+1; | |
1da177e4 LT |
532 | write_unlock_bh(&mrt_lock); |
533 | return 0; | |
534 | } | |
535 | ||
4feb88e5 BT |
536 | static struct mfc_cache *ipmr_cache_find(struct net *net, |
537 | __be32 origin, | |
538 | __be32 mcastgrp) | |
1da177e4 | 539 | { |
c354e124 | 540 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
541 | struct mfc_cache *c; |
542 | ||
4feb88e5 | 543 | for (c = net->ipv4.mfc_cache_array[line]; c; c = c->next) { |
1da177e4 LT |
544 | if (c->mfc_origin==origin && c->mfc_mcastgrp==mcastgrp) |
545 | break; | |
546 | } | |
547 | return c; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Allocate a multicast cache entry | |
552 | */ | |
5c0a66f5 | 553 | static struct mfc_cache *ipmr_cache_alloc(struct net *net) |
1da177e4 | 554 | { |
c354e124 JK |
555 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
556 | if (c == NULL) | |
1da177e4 | 557 | return NULL; |
1da177e4 | 558 | c->mfc_un.res.minvif = MAXVIFS; |
5c0a66f5 | 559 | mfc_net_set(c, net); |
1da177e4 LT |
560 | return c; |
561 | } | |
562 | ||
5c0a66f5 | 563 | static struct mfc_cache *ipmr_cache_alloc_unres(struct net *net) |
1da177e4 | 564 | { |
c354e124 JK |
565 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
566 | if (c == NULL) | |
1da177e4 | 567 | return NULL; |
1da177e4 LT |
568 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
569 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
5c0a66f5 | 570 | mfc_net_set(c, net); |
1da177e4 LT |
571 | return c; |
572 | } | |
573 | ||
574 | /* | |
575 | * A cache entry has gone into a resolved state from queued | |
576 | */ | |
e905a9ed | 577 | |
1da177e4 LT |
578 | static void ipmr_cache_resolve(struct mfc_cache *uc, struct mfc_cache *c) |
579 | { | |
580 | struct sk_buff *skb; | |
9ef1d4c7 | 581 | struct nlmsgerr *e; |
1da177e4 LT |
582 | |
583 | /* | |
584 | * Play the pending entries through our router | |
585 | */ | |
586 | ||
c354e124 | 587 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 588 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
589 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
590 | ||
591 | if (ipmr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
27a884dc ACM |
592 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
593 | (u8 *)nlh); | |
1da177e4 LT |
594 | } else { |
595 | nlh->nlmsg_type = NLMSG_ERROR; | |
596 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
597 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
598 | e = NLMSG_DATA(nlh); |
599 | e->error = -EMSGSIZE; | |
600 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 601 | } |
2942e900 | 602 | |
4feb88e5 | 603 | rtnl_unicast(skb, mfc_net(c), NETLINK_CB(skb).pid); |
1da177e4 LT |
604 | } else |
605 | ip_mr_forward(skb, c, 0); | |
606 | } | |
607 | } | |
608 | ||
609 | /* | |
610 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
611 | * expects the following bizarre scheme. | |
612 | * | |
613 | * Called under mrt_lock. | |
614 | */ | |
e905a9ed | 615 | |
4feb88e5 BT |
616 | static int ipmr_cache_report(struct net *net, |
617 | struct sk_buff *pkt, vifi_t vifi, int assert) | |
1da177e4 LT |
618 | { |
619 | struct sk_buff *skb; | |
c9bdd4b5 | 620 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
621 | struct igmphdr *igmp; |
622 | struct igmpmsg *msg; | |
623 | int ret; | |
624 | ||
625 | #ifdef CONFIG_IP_PIMSM | |
626 | if (assert == IGMPMSG_WHOLEPKT) | |
627 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
628 | else | |
629 | #endif | |
630 | skb = alloc_skb(128, GFP_ATOMIC); | |
631 | ||
132adf54 | 632 | if (!skb) |
1da177e4 LT |
633 | return -ENOBUFS; |
634 | ||
635 | #ifdef CONFIG_IP_PIMSM | |
636 | if (assert == IGMPMSG_WHOLEPKT) { | |
637 | /* Ugly, but we have no choice with this interface. | |
638 | Duplicate old header, fix ihl, length etc. | |
639 | And all this only to mangle msg->im_msgtype and | |
640 | to set msg->im_mbz to "mbz" :-) | |
641 | */ | |
878c8145 ACM |
642 | skb_push(skb, sizeof(struct iphdr)); |
643 | skb_reset_network_header(skb); | |
badff6d0 | 644 | skb_reset_transport_header(skb); |
0272ffc4 | 645 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 646 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
647 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
648 | msg->im_mbz = 0; | |
4feb88e5 | 649 | msg->im_vif = net->ipv4.mroute_reg_vif_num; |
eddc9ec5 ACM |
650 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
651 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
652 | sizeof(struct iphdr)); | |
e905a9ed | 653 | } else |
1da177e4 | 654 | #endif |
e905a9ed YH |
655 | { |
656 | ||
1da177e4 LT |
657 | /* |
658 | * Copy the IP header | |
659 | */ | |
660 | ||
27a884dc | 661 | skb->network_header = skb->tail; |
ddc7b8e3 | 662 | skb_put(skb, ihl); |
27d7ff46 | 663 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
664 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
665 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 | 666 | msg->im_vif = vifi; |
adf30907 | 667 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 LT |
668 | |
669 | /* | |
670 | * Add our header | |
671 | */ | |
672 | ||
c354e124 | 673 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
674 | igmp->type = |
675 | msg->im_msgtype = assert; | |
676 | igmp->code = 0; | |
eddc9ec5 | 677 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 678 | skb->transport_header = skb->network_header; |
e905a9ed | 679 | } |
1da177e4 | 680 | |
4feb88e5 | 681 | if (net->ipv4.mroute_sk == NULL) { |
1da177e4 LT |
682 | kfree_skb(skb); |
683 | return -EINVAL; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Deliver to mrouted | |
688 | */ | |
4feb88e5 | 689 | ret = sock_queue_rcv_skb(net->ipv4.mroute_sk, skb); |
70a269e6 | 690 | if (ret < 0) { |
1da177e4 LT |
691 | if (net_ratelimit()) |
692 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
693 | kfree_skb(skb); | |
694 | } | |
695 | ||
696 | return ret; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Queue a packet for resolution. It gets locked cache entry! | |
701 | */ | |
e905a9ed | 702 | |
1da177e4 | 703 | static int |
4feb88e5 | 704 | ipmr_cache_unresolved(struct net *net, vifi_t vifi, struct sk_buff *skb) |
1da177e4 LT |
705 | { |
706 | int err; | |
707 | struct mfc_cache *c; | |
eddc9ec5 | 708 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
709 | |
710 | spin_lock_bh(&mfc_unres_lock); | |
711 | for (c=mfc_unres_queue; c; c=c->next) { | |
4feb88e5 | 712 | if (net_eq(mfc_net(c), net) && |
1e8fb3b6 | 713 | c->mfc_mcastgrp == iph->daddr && |
eddc9ec5 | 714 | c->mfc_origin == iph->saddr) |
1da177e4 LT |
715 | break; |
716 | } | |
717 | ||
718 | if (c == NULL) { | |
719 | /* | |
720 | * Create a new entry if allowable | |
721 | */ | |
722 | ||
4feb88e5 BT |
723 | if (atomic_read(&net->ipv4.cache_resolve_queue_len) >= 10 || |
724 | (c = ipmr_cache_alloc_unres(net)) == NULL) { | |
1da177e4 LT |
725 | spin_unlock_bh(&mfc_unres_lock); |
726 | ||
727 | kfree_skb(skb); | |
728 | return -ENOBUFS; | |
729 | } | |
730 | ||
731 | /* | |
732 | * Fill in the new cache entry | |
733 | */ | |
eddc9ec5 ACM |
734 | c->mfc_parent = -1; |
735 | c->mfc_origin = iph->saddr; | |
736 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
737 | |
738 | /* | |
739 | * Reflect first query at mrouted. | |
740 | */ | |
4feb88e5 BT |
741 | err = ipmr_cache_report(net, skb, vifi, IGMPMSG_NOCACHE); |
742 | if (err < 0) { | |
e905a9ed | 743 | /* If the report failed throw the cache entry |
1da177e4 LT |
744 | out - Brad Parker |
745 | */ | |
746 | spin_unlock_bh(&mfc_unres_lock); | |
747 | ||
5c0a66f5 | 748 | ipmr_cache_free(c); |
1da177e4 LT |
749 | kfree_skb(skb); |
750 | return err; | |
751 | } | |
752 | ||
4feb88e5 | 753 | atomic_inc(&net->ipv4.cache_resolve_queue_len); |
1da177e4 LT |
754 | c->next = mfc_unres_queue; |
755 | mfc_unres_queue = c; | |
756 | ||
757 | mod_timer(&ipmr_expire_timer, c->mfc_un.unres.expires); | |
758 | } | |
759 | ||
760 | /* | |
761 | * See if we can append the packet | |
762 | */ | |
763 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
764 | kfree_skb(skb); | |
765 | err = -ENOBUFS; | |
766 | } else { | |
c354e124 | 767 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
768 | err = 0; |
769 | } | |
770 | ||
771 | spin_unlock_bh(&mfc_unres_lock); | |
772 | return err; | |
773 | } | |
774 | ||
775 | /* | |
776 | * MFC cache manipulation by user space mroute daemon | |
777 | */ | |
778 | ||
4feb88e5 | 779 | static int ipmr_mfc_delete(struct net *net, struct mfcctl *mfc) |
1da177e4 LT |
780 | { |
781 | int line; | |
782 | struct mfc_cache *c, **cp; | |
783 | ||
c354e124 | 784 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 785 | |
4feb88e5 | 786 | for (cp = &net->ipv4.mfc_cache_array[line]; |
2bb8b26c | 787 | (c = *cp) != NULL; cp = &c->next) { |
1da177e4 LT |
788 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
789 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
790 | write_lock_bh(&mrt_lock); | |
791 | *cp = c->next; | |
792 | write_unlock_bh(&mrt_lock); | |
793 | ||
5c0a66f5 | 794 | ipmr_cache_free(c); |
1da177e4 LT |
795 | return 0; |
796 | } | |
797 | } | |
798 | return -ENOENT; | |
799 | } | |
800 | ||
4feb88e5 | 801 | static int ipmr_mfc_add(struct net *net, struct mfcctl *mfc, int mrtsock) |
1da177e4 LT |
802 | { |
803 | int line; | |
804 | struct mfc_cache *uc, *c, **cp; | |
805 | ||
a50436f2 PM |
806 | if (mfc->mfcc_parent >= MAXVIFS) |
807 | return -ENFILE; | |
808 | ||
c354e124 | 809 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 810 | |
4feb88e5 | 811 | for (cp = &net->ipv4.mfc_cache_array[line]; |
2bb8b26c | 812 | (c = *cp) != NULL; cp = &c->next) { |
1da177e4 LT |
813 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
814 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) | |
815 | break; | |
816 | } | |
817 | ||
818 | if (c != NULL) { | |
819 | write_lock_bh(&mrt_lock); | |
820 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 821 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
822 | if (!mrtsock) |
823 | c->mfc_flags |= MFC_STATIC; | |
824 | write_unlock_bh(&mrt_lock); | |
825 | return 0; | |
826 | } | |
827 | ||
f97c1e0c | 828 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
829 | return -EINVAL; |
830 | ||
4feb88e5 | 831 | c = ipmr_cache_alloc(net); |
c354e124 | 832 | if (c == NULL) |
1da177e4 LT |
833 | return -ENOMEM; |
834 | ||
c354e124 JK |
835 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
836 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
837 | c->mfc_parent = mfc->mfcc_parent; | |
d1b04c08 | 838 | ipmr_update_thresholds(c, mfc->mfcc_ttls); |
1da177e4 LT |
839 | if (!mrtsock) |
840 | c->mfc_flags |= MFC_STATIC; | |
841 | ||
842 | write_lock_bh(&mrt_lock); | |
4feb88e5 BT |
843 | c->next = net->ipv4.mfc_cache_array[line]; |
844 | net->ipv4.mfc_cache_array[line] = c; | |
1da177e4 LT |
845 | write_unlock_bh(&mrt_lock); |
846 | ||
847 | /* | |
848 | * Check to see if we resolved a queued list. If so we | |
849 | * need to send on the frames and tidy up. | |
850 | */ | |
851 | spin_lock_bh(&mfc_unres_lock); | |
852 | for (cp = &mfc_unres_queue; (uc=*cp) != NULL; | |
853 | cp = &uc->next) { | |
4feb88e5 | 854 | if (net_eq(mfc_net(uc), net) && |
1e8fb3b6 | 855 | uc->mfc_origin == c->mfc_origin && |
1da177e4 LT |
856 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
857 | *cp = uc->next; | |
4feb88e5 | 858 | atomic_dec(&net->ipv4.cache_resolve_queue_len); |
1da177e4 LT |
859 | break; |
860 | } | |
861 | } | |
1e8fb3b6 BT |
862 | if (mfc_unres_queue == NULL) |
863 | del_timer(&ipmr_expire_timer); | |
1da177e4 LT |
864 | spin_unlock_bh(&mfc_unres_lock); |
865 | ||
866 | if (uc) { | |
867 | ipmr_cache_resolve(uc, c); | |
5c0a66f5 | 868 | ipmr_cache_free(uc); |
1da177e4 LT |
869 | } |
870 | return 0; | |
871 | } | |
872 | ||
873 | /* | |
874 | * Close the multicast socket, and clear the vif tables etc | |
875 | */ | |
e905a9ed | 876 | |
4feb88e5 | 877 | static void mroute_clean_tables(struct net *net) |
1da177e4 LT |
878 | { |
879 | int i; | |
d17fa6fa | 880 | LIST_HEAD(list); |
e905a9ed | 881 | |
1da177e4 LT |
882 | /* |
883 | * Shut down all active vif entries | |
884 | */ | |
4feb88e5 BT |
885 | for (i = 0; i < net->ipv4.maxvif; i++) { |
886 | if (!(net->ipv4.vif_table[i].flags&VIFF_STATIC)) | |
d17fa6fa | 887 | vif_delete(net, i, 0, &list); |
1da177e4 | 888 | } |
d17fa6fa | 889 | unregister_netdevice_many(&list); |
1da177e4 LT |
890 | |
891 | /* | |
892 | * Wipe the cache | |
893 | */ | |
c354e124 | 894 | for (i=0; i<MFC_LINES; i++) { |
1da177e4 LT |
895 | struct mfc_cache *c, **cp; |
896 | ||
4feb88e5 | 897 | cp = &net->ipv4.mfc_cache_array[i]; |
1da177e4 LT |
898 | while ((c = *cp) != NULL) { |
899 | if (c->mfc_flags&MFC_STATIC) { | |
900 | cp = &c->next; | |
901 | continue; | |
902 | } | |
903 | write_lock_bh(&mrt_lock); | |
904 | *cp = c->next; | |
905 | write_unlock_bh(&mrt_lock); | |
906 | ||
5c0a66f5 | 907 | ipmr_cache_free(c); |
1da177e4 LT |
908 | } |
909 | } | |
910 | ||
4feb88e5 | 911 | if (atomic_read(&net->ipv4.cache_resolve_queue_len) != 0) { |
1e8fb3b6 | 912 | struct mfc_cache *c, **cp; |
1da177e4 LT |
913 | |
914 | spin_lock_bh(&mfc_unres_lock); | |
1e8fb3b6 BT |
915 | cp = &mfc_unres_queue; |
916 | while ((c = *cp) != NULL) { | |
4feb88e5 | 917 | if (!net_eq(mfc_net(c), net)) { |
1e8fb3b6 BT |
918 | cp = &c->next; |
919 | continue; | |
920 | } | |
921 | *cp = c->next; | |
1da177e4 LT |
922 | |
923 | ipmr_destroy_unres(c); | |
1da177e4 LT |
924 | } |
925 | spin_unlock_bh(&mfc_unres_lock); | |
926 | } | |
927 | } | |
928 | ||
929 | static void mrtsock_destruct(struct sock *sk) | |
930 | { | |
4feb88e5 BT |
931 | struct net *net = sock_net(sk); |
932 | ||
1da177e4 | 933 | rtnl_lock(); |
4feb88e5 BT |
934 | if (sk == net->ipv4.mroute_sk) { |
935 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; | |
1da177e4 LT |
936 | |
937 | write_lock_bh(&mrt_lock); | |
4feb88e5 | 938 | net->ipv4.mroute_sk = NULL; |
1da177e4 LT |
939 | write_unlock_bh(&mrt_lock); |
940 | ||
4feb88e5 | 941 | mroute_clean_tables(net); |
1da177e4 LT |
942 | } |
943 | rtnl_unlock(); | |
944 | } | |
945 | ||
946 | /* | |
947 | * Socket options and virtual interface manipulation. The whole | |
948 | * virtual interface system is a complete heap, but unfortunately | |
949 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
950 | * MOSPF/PIM router set up we can clean this up. | |
951 | */ | |
e905a9ed | 952 | |
b7058842 | 953 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
954 | { |
955 | int ret; | |
956 | struct vifctl vif; | |
957 | struct mfcctl mfc; | |
4feb88e5 | 958 | struct net *net = sock_net(sk); |
e905a9ed | 959 | |
132adf54 | 960 | if (optname != MRT_INIT) { |
4feb88e5 | 961 | if (sk != net->ipv4.mroute_sk && !capable(CAP_NET_ADMIN)) |
1da177e4 LT |
962 | return -EACCES; |
963 | } | |
964 | ||
132adf54 SH |
965 | switch (optname) { |
966 | case MRT_INIT: | |
967 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 968 | inet_sk(sk)->inet_num != IPPROTO_IGMP) |
132adf54 | 969 | return -EOPNOTSUPP; |
c354e124 | 970 | if (optlen != sizeof(int)) |
132adf54 | 971 | return -ENOPROTOOPT; |
1da177e4 | 972 | |
132adf54 | 973 | rtnl_lock(); |
4feb88e5 | 974 | if (net->ipv4.mroute_sk) { |
1da177e4 | 975 | rtnl_unlock(); |
132adf54 SH |
976 | return -EADDRINUSE; |
977 | } | |
978 | ||
979 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
980 | if (ret == 0) { | |
981 | write_lock_bh(&mrt_lock); | |
4feb88e5 | 982 | net->ipv4.mroute_sk = sk; |
132adf54 SH |
983 | write_unlock_bh(&mrt_lock); |
984 | ||
4feb88e5 | 985 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
132adf54 SH |
986 | } |
987 | rtnl_unlock(); | |
988 | return ret; | |
989 | case MRT_DONE: | |
4feb88e5 | 990 | if (sk != net->ipv4.mroute_sk) |
132adf54 SH |
991 | return -EACCES; |
992 | return ip_ra_control(sk, 0, NULL); | |
993 | case MRT_ADD_VIF: | |
994 | case MRT_DEL_VIF: | |
c354e124 | 995 | if (optlen != sizeof(vif)) |
132adf54 | 996 | return -EINVAL; |
c354e124 | 997 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
998 | return -EFAULT; |
999 | if (vif.vifc_vifi >= MAXVIFS) | |
1000 | return -ENFILE; | |
1001 | rtnl_lock(); | |
c354e124 | 1002 | if (optname == MRT_ADD_VIF) { |
4feb88e5 | 1003 | ret = vif_add(net, &vif, sk == net->ipv4.mroute_sk); |
132adf54 | 1004 | } else { |
d17fa6fa | 1005 | ret = vif_delete(net, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1006 | } |
1007 | rtnl_unlock(); | |
1008 | return ret; | |
1da177e4 LT |
1009 | |
1010 | /* | |
1011 | * Manipulate the forwarding caches. These live | |
1012 | * in a sort of kernel/user symbiosis. | |
1013 | */ | |
132adf54 SH |
1014 | case MRT_ADD_MFC: |
1015 | case MRT_DEL_MFC: | |
c354e124 | 1016 | if (optlen != sizeof(mfc)) |
132adf54 | 1017 | return -EINVAL; |
c354e124 | 1018 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
1019 | return -EFAULT; |
1020 | rtnl_lock(); | |
c354e124 | 1021 | if (optname == MRT_DEL_MFC) |
4feb88e5 | 1022 | ret = ipmr_mfc_delete(net, &mfc); |
132adf54 | 1023 | else |
4feb88e5 | 1024 | ret = ipmr_mfc_add(net, &mfc, sk == net->ipv4.mroute_sk); |
132adf54 SH |
1025 | rtnl_unlock(); |
1026 | return ret; | |
1da177e4 LT |
1027 | /* |
1028 | * Control PIM assert. | |
1029 | */ | |
132adf54 SH |
1030 | case MRT_ASSERT: |
1031 | { | |
1032 | int v; | |
1033 | if (get_user(v,(int __user *)optval)) | |
1034 | return -EFAULT; | |
4feb88e5 | 1035 | net->ipv4.mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1036 | return 0; |
1037 | } | |
1da177e4 | 1038 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1039 | case MRT_PIM: |
1040 | { | |
ba93ef74 SH |
1041 | int v; |
1042 | ||
132adf54 SH |
1043 | if (get_user(v,(int __user *)optval)) |
1044 | return -EFAULT; | |
ba93ef74 SH |
1045 | v = (v) ? 1 : 0; |
1046 | ||
132adf54 SH |
1047 | rtnl_lock(); |
1048 | ret = 0; | |
4feb88e5 BT |
1049 | if (v != net->ipv4.mroute_do_pim) { |
1050 | net->ipv4.mroute_do_pim = v; | |
1051 | net->ipv4.mroute_do_assert = v; | |
1da177e4 | 1052 | } |
132adf54 SH |
1053 | rtnl_unlock(); |
1054 | return ret; | |
1055 | } | |
1da177e4 | 1056 | #endif |
132adf54 SH |
1057 | /* |
1058 | * Spurious command, or MRT_VERSION which you cannot | |
1059 | * set. | |
1060 | */ | |
1061 | default: | |
1062 | return -ENOPROTOOPT; | |
1da177e4 LT |
1063 | } |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * Getsock opt support for the multicast routing system. | |
1068 | */ | |
e905a9ed | 1069 | |
c354e124 | 1070 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1071 | { |
1072 | int olr; | |
1073 | int val; | |
4feb88e5 | 1074 | struct net *net = sock_net(sk); |
1da177e4 | 1075 | |
c354e124 | 1076 | if (optname != MRT_VERSION && |
1da177e4 LT |
1077 | #ifdef CONFIG_IP_PIMSM |
1078 | optname!=MRT_PIM && | |
1079 | #endif | |
1080 | optname!=MRT_ASSERT) | |
1081 | return -ENOPROTOOPT; | |
1082 | ||
1083 | if (get_user(olr, optlen)) | |
1084 | return -EFAULT; | |
1085 | ||
1086 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1087 | if (olr < 0) | |
1088 | return -EINVAL; | |
e905a9ed | 1089 | |
c354e124 | 1090 | if (put_user(olr, optlen)) |
1da177e4 | 1091 | return -EFAULT; |
c354e124 JK |
1092 | if (optname == MRT_VERSION) |
1093 | val = 0x0305; | |
1da177e4 | 1094 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1095 | else if (optname == MRT_PIM) |
4feb88e5 | 1096 | val = net->ipv4.mroute_do_pim; |
1da177e4 LT |
1097 | #endif |
1098 | else | |
4feb88e5 | 1099 | val = net->ipv4.mroute_do_assert; |
c354e124 | 1100 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1101 | return -EFAULT; |
1102 | return 0; | |
1103 | } | |
1104 | ||
1105 | /* | |
1106 | * The IP multicast ioctl support routines. | |
1107 | */ | |
e905a9ed | 1108 | |
1da177e4 LT |
1109 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1110 | { | |
1111 | struct sioc_sg_req sr; | |
1112 | struct sioc_vif_req vr; | |
1113 | struct vif_device *vif; | |
1114 | struct mfc_cache *c; | |
4feb88e5 | 1115 | struct net *net = sock_net(sk); |
e905a9ed | 1116 | |
132adf54 SH |
1117 | switch (cmd) { |
1118 | case SIOCGETVIFCNT: | |
c354e124 | 1119 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1120 | return -EFAULT; |
4feb88e5 | 1121 | if (vr.vifi >= net->ipv4.maxvif) |
132adf54 SH |
1122 | return -EINVAL; |
1123 | read_lock(&mrt_lock); | |
4feb88e5 BT |
1124 | vif = &net->ipv4.vif_table[vr.vifi]; |
1125 | if (VIF_EXISTS(net, vr.vifi)) { | |
c354e124 JK |
1126 | vr.icount = vif->pkt_in; |
1127 | vr.ocount = vif->pkt_out; | |
1128 | vr.ibytes = vif->bytes_in; | |
1129 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1130 | read_unlock(&mrt_lock); |
1da177e4 | 1131 | |
c354e124 | 1132 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1133 | return -EFAULT; |
1134 | return 0; | |
1135 | } | |
1136 | read_unlock(&mrt_lock); | |
1137 | return -EADDRNOTAVAIL; | |
1138 | case SIOCGETSGCNT: | |
c354e124 | 1139 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1140 | return -EFAULT; |
1141 | ||
1142 | read_lock(&mrt_lock); | |
4feb88e5 | 1143 | c = ipmr_cache_find(net, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1144 | if (c) { |
1145 | sr.pktcnt = c->mfc_un.res.pkt; | |
1146 | sr.bytecnt = c->mfc_un.res.bytes; | |
1147 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1148 | read_unlock(&mrt_lock); |
132adf54 | 1149 | |
c354e124 | 1150 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1151 | return -EFAULT; |
1152 | return 0; | |
1153 | } | |
1154 | read_unlock(&mrt_lock); | |
1155 | return -EADDRNOTAVAIL; | |
1156 | default: | |
1157 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1158 | } |
1159 | } | |
1160 | ||
1161 | ||
1162 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1163 | { | |
e9dc8653 | 1164 | struct net_device *dev = ptr; |
4feb88e5 | 1165 | struct net *net = dev_net(dev); |
1da177e4 LT |
1166 | struct vif_device *v; |
1167 | int ct; | |
d17fa6fa | 1168 | LIST_HEAD(list); |
e9dc8653 | 1169 | |
1da177e4 LT |
1170 | if (event != NETDEV_UNREGISTER) |
1171 | return NOTIFY_DONE; | |
4feb88e5 BT |
1172 | v = &net->ipv4.vif_table[0]; |
1173 | for (ct = 0; ct < net->ipv4.maxvif; ct++, v++) { | |
c354e124 | 1174 | if (v->dev == dev) |
d17fa6fa | 1175 | vif_delete(net, ct, 1, &list); |
1da177e4 | 1176 | } |
d17fa6fa | 1177 | unregister_netdevice_many(&list); |
1da177e4 LT |
1178 | return NOTIFY_DONE; |
1179 | } | |
1180 | ||
1181 | ||
c354e124 | 1182 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1183 | .notifier_call = ipmr_device_event, |
1184 | }; | |
1185 | ||
1186 | /* | |
1187 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1188 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1189 | * important for multicast video. | |
1190 | */ | |
e905a9ed | 1191 | |
114c7844 | 1192 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1193 | { |
8856dfa3 | 1194 | struct iphdr *iph; |
eddc9ec5 | 1195 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1196 | |
1197 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1198 | skb->transport_header = skb->network_header; |
8856dfa3 | 1199 | skb_reset_network_header(skb); |
eddc9ec5 | 1200 | iph = ip_hdr(skb); |
1da177e4 LT |
1201 | |
1202 | iph->version = 4; | |
e023dd64 ACM |
1203 | iph->tos = old_iph->tos; |
1204 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1205 | iph->frag_off = 0; |
1206 | iph->daddr = daddr; | |
1207 | iph->saddr = saddr; | |
1208 | iph->protocol = IPPROTO_IPIP; | |
1209 | iph->ihl = 5; | |
1210 | iph->tot_len = htons(skb->len); | |
adf30907 | 1211 | ip_select_ident(iph, skb_dst(skb), NULL); |
1da177e4 LT |
1212 | ip_send_check(iph); |
1213 | ||
1da177e4 LT |
1214 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1215 | nf_reset(skb); | |
1216 | } | |
1217 | ||
1218 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1219 | { | |
1220 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1221 | ||
adf30907 | 1222 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1223 | |
1224 | if (unlikely(opt->optlen)) | |
1225 | ip_forward_options(skb); | |
1226 | ||
1227 | return dst_output(skb); | |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * Processing handlers for ipmr_forward | |
1232 | */ | |
1233 | ||
1234 | static void ipmr_queue_xmit(struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1235 | { | |
4feb88e5 | 1236 | struct net *net = mfc_net(c); |
eddc9ec5 | 1237 | const struct iphdr *iph = ip_hdr(skb); |
4feb88e5 | 1238 | struct vif_device *vif = &net->ipv4.vif_table[vifi]; |
1da177e4 LT |
1239 | struct net_device *dev; |
1240 | struct rtable *rt; | |
1241 | int encap = 0; | |
1242 | ||
1243 | if (vif->dev == NULL) | |
1244 | goto out_free; | |
1245 | ||
1246 | #ifdef CONFIG_IP_PIMSM | |
1247 | if (vif->flags & VIFF_REGISTER) { | |
1248 | vif->pkt_out++; | |
c354e124 | 1249 | vif->bytes_out += skb->len; |
cf3677ae PE |
1250 | vif->dev->stats.tx_bytes += skb->len; |
1251 | vif->dev->stats.tx_packets++; | |
4feb88e5 | 1252 | ipmr_cache_report(net, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1253 | goto out_free; |
1da177e4 LT |
1254 | } |
1255 | #endif | |
1256 | ||
1257 | if (vif->flags&VIFF_TUNNEL) { | |
1258 | struct flowi fl = { .oif = vif->link, | |
1259 | .nl_u = { .ip4_u = | |
1260 | { .daddr = vif->remote, | |
1261 | .saddr = vif->local, | |
1262 | .tos = RT_TOS(iph->tos) } }, | |
1263 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1264 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1265 | goto out_free; |
1266 | encap = sizeof(struct iphdr); | |
1267 | } else { | |
1268 | struct flowi fl = { .oif = vif->link, | |
1269 | .nl_u = { .ip4_u = | |
1270 | { .daddr = iph->daddr, | |
1271 | .tos = RT_TOS(iph->tos) } }, | |
1272 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1273 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1274 | goto out_free; |
1275 | } | |
1276 | ||
1277 | dev = rt->u.dst.dev; | |
1278 | ||
1279 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1280 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1281 | allow to send ICMP, so that packets will disappear | |
1282 | to blackhole. | |
1283 | */ | |
1284 | ||
7c73a6fa | 1285 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1286 | ip_rt_put(rt); |
1287 | goto out_free; | |
1288 | } | |
1289 | ||
1290 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1291 | ||
1292 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1293 | ip_rt_put(rt); |
1da177e4 LT |
1294 | goto out_free; |
1295 | } | |
1296 | ||
1297 | vif->pkt_out++; | |
c354e124 | 1298 | vif->bytes_out += skb->len; |
1da177e4 | 1299 | |
adf30907 ED |
1300 | skb_dst_drop(skb); |
1301 | skb_dst_set(skb, &rt->u.dst); | |
eddc9ec5 | 1302 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1303 | |
1304 | /* FIXME: forward and output firewalls used to be called here. | |
1305 | * What do we do with netfilter? -- RR */ | |
1306 | if (vif->flags & VIFF_TUNNEL) { | |
1307 | ip_encap(skb, vif->local, vif->remote); | |
1308 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1309 | vif->dev->stats.tx_packets++; |
1310 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1311 | } |
1312 | ||
1313 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1314 | ||
1315 | /* | |
1316 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1317 | * not only before forwarding, but after forwarding on all output | |
1318 | * interfaces. It is clear, if mrouter runs a multicasting | |
1319 | * program, it should receive packets not depending to what interface | |
1320 | * program is joined. | |
1321 | * If we will not make it, the program will have to join on all | |
1322 | * interfaces. On the other hand, multihoming host (or router, but | |
1323 | * not mrouter) cannot join to more than one interface - it will | |
1324 | * result in receiving multiple packets. | |
1325 | */ | |
6e23ae2a | 1326 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1327 | ipmr_forward_finish); |
1328 | return; | |
1329 | ||
1330 | out_free: | |
1331 | kfree_skb(skb); | |
1332 | return; | |
1333 | } | |
1334 | ||
1335 | static int ipmr_find_vif(struct net_device *dev) | |
1336 | { | |
4feb88e5 | 1337 | struct net *net = dev_net(dev); |
1da177e4 | 1338 | int ct; |
4feb88e5 BT |
1339 | for (ct = net->ipv4.maxvif-1; ct >= 0; ct--) { |
1340 | if (net->ipv4.vif_table[ct].dev == dev) | |
1da177e4 LT |
1341 | break; |
1342 | } | |
1343 | return ct; | |
1344 | } | |
1345 | ||
1346 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1347 | ||
1348 | static int ip_mr_forward(struct sk_buff *skb, struct mfc_cache *cache, int local) | |
1349 | { | |
1350 | int psend = -1; | |
1351 | int vif, ct; | |
4feb88e5 | 1352 | struct net *net = mfc_net(cache); |
1da177e4 LT |
1353 | |
1354 | vif = cache->mfc_parent; | |
1355 | cache->mfc_un.res.pkt++; | |
1356 | cache->mfc_un.res.bytes += skb->len; | |
1357 | ||
1358 | /* | |
1359 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1360 | */ | |
4feb88e5 | 1361 | if (net->ipv4.vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1362 | int true_vifi; |
1363 | ||
511c3f92 | 1364 | if (skb_rtable(skb)->fl.iif == 0) { |
1da177e4 LT |
1365 | /* It is our own packet, looped back. |
1366 | Very complicated situation... | |
1367 | ||
1368 | The best workaround until routing daemons will be | |
1369 | fixed is not to redistribute packet, if it was | |
1370 | send through wrong interface. It means, that | |
1371 | multicast applications WILL NOT work for | |
1372 | (S,G), which have default multicast route pointing | |
1373 | to wrong oif. In any case, it is not a good | |
1374 | idea to use multicasting applications on router. | |
1375 | */ | |
1376 | goto dont_forward; | |
1377 | } | |
1378 | ||
1379 | cache->mfc_un.res.wrong_if++; | |
1380 | true_vifi = ipmr_find_vif(skb->dev); | |
1381 | ||
4feb88e5 | 1382 | if (true_vifi >= 0 && net->ipv4.mroute_do_assert && |
1da177e4 LT |
1383 | /* pimsm uses asserts, when switching from RPT to SPT, |
1384 | so that we cannot check that packet arrived on an oif. | |
1385 | It is bad, but otherwise we would need to move pretty | |
1386 | large chunk of pimd to kernel. Ough... --ANK | |
1387 | */ | |
4feb88e5 | 1388 | (net->ipv4.mroute_do_pim || |
6f9374a9 | 1389 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1390 | time_after(jiffies, |
1da177e4 LT |
1391 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1392 | cache->mfc_un.res.last_assert = jiffies; | |
4feb88e5 | 1393 | ipmr_cache_report(net, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1394 | } |
1395 | goto dont_forward; | |
1396 | } | |
1397 | ||
4feb88e5 BT |
1398 | net->ipv4.vif_table[vif].pkt_in++; |
1399 | net->ipv4.vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1400 | |
1401 | /* | |
1402 | * Forward the frame | |
1403 | */ | |
1404 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1405 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1406 | if (psend != -1) { |
1407 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1408 | if (skb2) | |
1409 | ipmr_queue_xmit(skb2, cache, psend); | |
1410 | } | |
c354e124 | 1411 | psend = ct; |
1da177e4 LT |
1412 | } |
1413 | } | |
1414 | if (psend != -1) { | |
1415 | if (local) { | |
1416 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1417 | if (skb2) | |
1418 | ipmr_queue_xmit(skb2, cache, psend); | |
1419 | } else { | |
1420 | ipmr_queue_xmit(skb, cache, psend); | |
1421 | return 0; | |
1422 | } | |
1423 | } | |
1424 | ||
1425 | dont_forward: | |
1426 | if (!local) | |
1427 | kfree_skb(skb); | |
1428 | return 0; | |
1429 | } | |
1430 | ||
1431 | ||
1432 | /* | |
1433 | * Multicast packets for forwarding arrive here | |
1434 | */ | |
1435 | ||
1436 | int ip_mr_input(struct sk_buff *skb) | |
1437 | { | |
1438 | struct mfc_cache *cache; | |
4feb88e5 | 1439 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1440 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
1da177e4 LT |
1441 | |
1442 | /* Packet is looped back after forward, it should not be | |
1443 | forwarded second time, but still can be delivered locally. | |
1444 | */ | |
1445 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1446 | goto dont_forward; | |
1447 | ||
1448 | if (!local) { | |
1449 | if (IPCB(skb)->opt.router_alert) { | |
1450 | if (ip_call_ra_chain(skb)) | |
1451 | return 0; | |
eddc9ec5 | 1452 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1453 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1454 | Cisco IOS <= 11.2(8)) do not put router alert | |
1455 | option to IGMP packets destined to routable | |
1456 | groups. It is very bad, because it means | |
1457 | that we can forward NO IGMP messages. | |
1458 | */ | |
1459 | read_lock(&mrt_lock); | |
4feb88e5 | 1460 | if (net->ipv4.mroute_sk) { |
2715bcf9 | 1461 | nf_reset(skb); |
4feb88e5 | 1462 | raw_rcv(net->ipv4.mroute_sk, skb); |
1da177e4 LT |
1463 | read_unlock(&mrt_lock); |
1464 | return 0; | |
1465 | } | |
1466 | read_unlock(&mrt_lock); | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | read_lock(&mrt_lock); | |
4feb88e5 | 1471 | cache = ipmr_cache_find(net, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1472 | |
1473 | /* | |
1474 | * No usable cache entry | |
1475 | */ | |
c354e124 | 1476 | if (cache == NULL) { |
1da177e4 LT |
1477 | int vif; |
1478 | ||
1479 | if (local) { | |
1480 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1481 | ip_local_deliver(skb); | |
1482 | if (skb2 == NULL) { | |
1483 | read_unlock(&mrt_lock); | |
1484 | return -ENOBUFS; | |
1485 | } | |
1486 | skb = skb2; | |
1487 | } | |
1488 | ||
1489 | vif = ipmr_find_vif(skb->dev); | |
1490 | if (vif >= 0) { | |
4feb88e5 | 1491 | int err = ipmr_cache_unresolved(net, vif, skb); |
1da177e4 LT |
1492 | read_unlock(&mrt_lock); |
1493 | ||
1494 | return err; | |
1495 | } | |
1496 | read_unlock(&mrt_lock); | |
1497 | kfree_skb(skb); | |
1498 | return -ENODEV; | |
1499 | } | |
1500 | ||
1501 | ip_mr_forward(skb, cache, local); | |
1502 | ||
1503 | read_unlock(&mrt_lock); | |
1504 | ||
1505 | if (local) | |
1506 | return ip_local_deliver(skb); | |
1507 | ||
1508 | return 0; | |
1509 | ||
1510 | dont_forward: | |
1511 | if (local) | |
1512 | return ip_local_deliver(skb); | |
1513 | kfree_skb(skb); | |
1514 | return 0; | |
1515 | } | |
1516 | ||
b1879204 IJ |
1517 | #ifdef CONFIG_IP_PIMSM |
1518 | static int __pim_rcv(struct sk_buff *skb, unsigned int pimlen) | |
1da177e4 | 1519 | { |
b1879204 IJ |
1520 | struct net_device *reg_dev = NULL; |
1521 | struct iphdr *encap; | |
4feb88e5 | 1522 | struct net *net = dev_net(skb->dev); |
1da177e4 | 1523 | |
b1879204 | 1524 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1525 | /* |
1526 | Check that: | |
1527 | a. packet is really destinted to a multicast group | |
1528 | b. packet is not a NULL-REGISTER | |
1529 | c. packet is not truncated | |
1530 | */ | |
f97c1e0c | 1531 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1532 | encap->tot_len == 0 || |
b1879204 IJ |
1533 | ntohs(encap->tot_len) + pimlen > skb->len) |
1534 | return 1; | |
1da177e4 LT |
1535 | |
1536 | read_lock(&mrt_lock); | |
4feb88e5 BT |
1537 | if (net->ipv4.mroute_reg_vif_num >= 0) |
1538 | reg_dev = net->ipv4.vif_table[net->ipv4.mroute_reg_vif_num].dev; | |
1da177e4 LT |
1539 | if (reg_dev) |
1540 | dev_hold(reg_dev); | |
1541 | read_unlock(&mrt_lock); | |
1542 | ||
e905a9ed | 1543 | if (reg_dev == NULL) |
b1879204 | 1544 | return 1; |
1da177e4 | 1545 | |
b0e380b1 | 1546 | skb->mac_header = skb->network_header; |
1da177e4 | 1547 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1548 | skb_reset_network_header(skb); |
1da177e4 | 1549 | skb->dev = reg_dev; |
1da177e4 LT |
1550 | skb->protocol = htons(ETH_P_IP); |
1551 | skb->ip_summed = 0; | |
1552 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 1553 | skb_dst_drop(skb); |
cf3677ae PE |
1554 | reg_dev->stats.rx_bytes += skb->len; |
1555 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1556 | nf_reset(skb); |
1557 | netif_rx(skb); | |
1558 | dev_put(reg_dev); | |
b1879204 | 1559 | |
1da177e4 | 1560 | return 0; |
b1879204 IJ |
1561 | } |
1562 | #endif | |
1563 | ||
1564 | #ifdef CONFIG_IP_PIMSM_V1 | |
1565 | /* | |
1566 | * Handle IGMP messages of PIMv1 | |
1567 | */ | |
1568 | ||
1569 | int pim_rcv_v1(struct sk_buff * skb) | |
1570 | { | |
1571 | struct igmphdr *pim; | |
4feb88e5 | 1572 | struct net *net = dev_net(skb->dev); |
b1879204 IJ |
1573 | |
1574 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1575 | goto drop; | |
1576 | ||
1577 | pim = igmp_hdr(skb); | |
1578 | ||
4feb88e5 | 1579 | if (!net->ipv4.mroute_do_pim || |
b1879204 IJ |
1580 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1581 | goto drop; | |
1582 | ||
1583 | if (__pim_rcv(skb, sizeof(*pim))) { | |
1584 | drop: | |
1585 | kfree_skb(skb); | |
1586 | } | |
1da177e4 LT |
1587 | return 0; |
1588 | } | |
1589 | #endif | |
1590 | ||
1591 | #ifdef CONFIG_IP_PIMSM_V2 | |
1592 | static int pim_rcv(struct sk_buff * skb) | |
1593 | { | |
1594 | struct pimreghdr *pim; | |
1da177e4 | 1595 | |
b1879204 | 1596 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1597 | goto drop; |
1598 | ||
9c70220b | 1599 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1600 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1601 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1602 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1603 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1604 | goto drop; |
1605 | ||
b1879204 IJ |
1606 | if (__pim_rcv(skb, sizeof(*pim))) { |
1607 | drop: | |
1608 | kfree_skb(skb); | |
1609 | } | |
1da177e4 LT |
1610 | return 0; |
1611 | } | |
1612 | #endif | |
1613 | ||
1614 | static int | |
1615 | ipmr_fill_mroute(struct sk_buff *skb, struct mfc_cache *c, struct rtmsg *rtm) | |
1616 | { | |
1617 | int ct; | |
1618 | struct rtnexthop *nhp; | |
4feb88e5 | 1619 | struct net *net = mfc_net(c); |
27a884dc | 1620 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1621 | struct rtattr *mp_head; |
1622 | ||
7438189b ND |
1623 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1624 | if (c->mfc_parent > MAXVIFS) | |
1625 | return -ENOENT; | |
1626 | ||
1627 | if (VIF_EXISTS(net, c->mfc_parent)) | |
1628 | RTA_PUT(skb, RTA_IIF, 4, &net->ipv4.vif_table[c->mfc_parent].dev->ifindex); | |
1da177e4 | 1629 | |
c354e124 | 1630 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1631 | |
1632 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
7438189b | 1633 | if (VIF_EXISTS(net, ct) && c->mfc_un.res.ttls[ct] < 255) { |
1da177e4 LT |
1634 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1635 | goto rtattr_failure; | |
c354e124 | 1636 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1637 | nhp->rtnh_flags = 0; |
1638 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
4feb88e5 | 1639 | nhp->rtnh_ifindex = net->ipv4.vif_table[ct].dev->ifindex; |
1da177e4 LT |
1640 | nhp->rtnh_len = sizeof(*nhp); |
1641 | } | |
1642 | } | |
1643 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1644 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1645 | rtm->rtm_type = RTN_MULTICAST; |
1646 | return 1; | |
1647 | ||
1648 | rtattr_failure: | |
dc5fc579 | 1649 | nlmsg_trim(skb, b); |
1da177e4 LT |
1650 | return -EMSGSIZE; |
1651 | } | |
1652 | ||
4feb88e5 BT |
1653 | int ipmr_get_route(struct net *net, |
1654 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1da177e4 LT |
1655 | { |
1656 | int err; | |
1657 | struct mfc_cache *cache; | |
511c3f92 | 1658 | struct rtable *rt = skb_rtable(skb); |
1da177e4 LT |
1659 | |
1660 | read_lock(&mrt_lock); | |
4feb88e5 | 1661 | cache = ipmr_cache_find(net, rt->rt_src, rt->rt_dst); |
1da177e4 | 1662 | |
c354e124 | 1663 | if (cache == NULL) { |
72287490 | 1664 | struct sk_buff *skb2; |
eddc9ec5 | 1665 | struct iphdr *iph; |
1da177e4 LT |
1666 | struct net_device *dev; |
1667 | int vif; | |
1668 | ||
1669 | if (nowait) { | |
1670 | read_unlock(&mrt_lock); | |
1671 | return -EAGAIN; | |
1672 | } | |
1673 | ||
1674 | dev = skb->dev; | |
1675 | if (dev == NULL || (vif = ipmr_find_vif(dev)) < 0) { | |
1676 | read_unlock(&mrt_lock); | |
1677 | return -ENODEV; | |
1678 | } | |
72287490 AK |
1679 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1680 | if (!skb2) { | |
1681 | read_unlock(&mrt_lock); | |
1682 | return -ENOMEM; | |
1683 | } | |
1684 | ||
e2d1bca7 ACM |
1685 | skb_push(skb2, sizeof(struct iphdr)); |
1686 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1687 | iph = ip_hdr(skb2); |
1688 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1689 | iph->saddr = rt->rt_src; | |
1690 | iph->daddr = rt->rt_dst; | |
1691 | iph->version = 0; | |
4feb88e5 | 1692 | err = ipmr_cache_unresolved(net, vif, skb2); |
1da177e4 LT |
1693 | read_unlock(&mrt_lock); |
1694 | return err; | |
1695 | } | |
1696 | ||
1697 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1698 | cache->mfc_flags |= MFC_NOTIFY; | |
1699 | err = ipmr_fill_mroute(skb, cache, rtm); | |
1700 | read_unlock(&mrt_lock); | |
1701 | return err; | |
1702 | } | |
1703 | ||
e905a9ed | 1704 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1705 | /* |
1706 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1707 | */ | |
1708 | struct ipmr_vif_iter { | |
f6bb4514 | 1709 | struct seq_net_private p; |
1da177e4 LT |
1710 | int ct; |
1711 | }; | |
1712 | ||
f6bb4514 BT |
1713 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
1714 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
1715 | loff_t pos) |
1716 | { | |
f6bb4514 BT |
1717 | for (iter->ct = 0; iter->ct < net->ipv4.maxvif; ++iter->ct) { |
1718 | if (!VIF_EXISTS(net, iter->ct)) | |
1da177e4 | 1719 | continue; |
e905a9ed | 1720 | if (pos-- == 0) |
f6bb4514 | 1721 | return &net->ipv4.vif_table[iter->ct]; |
1da177e4 LT |
1722 | } |
1723 | return NULL; | |
1724 | } | |
1725 | ||
1726 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 1727 | __acquires(mrt_lock) |
1da177e4 | 1728 | { |
f6bb4514 BT |
1729 | struct net *net = seq_file_net(seq); |
1730 | ||
1da177e4 | 1731 | read_lock(&mrt_lock); |
f6bb4514 | 1732 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
1733 | : SEQ_START_TOKEN; |
1734 | } | |
1735 | ||
1736 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1737 | { | |
1738 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 1739 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1740 | |
1741 | ++*pos; | |
1742 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 1743 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 1744 | |
f6bb4514 BT |
1745 | while (++iter->ct < net->ipv4.maxvif) { |
1746 | if (!VIF_EXISTS(net, iter->ct)) | |
1da177e4 | 1747 | continue; |
f6bb4514 | 1748 | return &net->ipv4.vif_table[iter->ct]; |
1da177e4 LT |
1749 | } |
1750 | return NULL; | |
1751 | } | |
1752 | ||
1753 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 1754 | __releases(mrt_lock) |
1da177e4 LT |
1755 | { |
1756 | read_unlock(&mrt_lock); | |
1757 | } | |
1758 | ||
1759 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
1760 | { | |
f6bb4514 BT |
1761 | struct net *net = seq_file_net(seq); |
1762 | ||
1da177e4 | 1763 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 1764 | seq_puts(seq, |
1da177e4 LT |
1765 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
1766 | } else { | |
1767 | const struct vif_device *vif = v; | |
1768 | const char *name = vif->dev ? vif->dev->name : "none"; | |
1769 | ||
1770 | seq_printf(seq, | |
1771 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
f6bb4514 | 1772 | vif - net->ipv4.vif_table, |
e905a9ed | 1773 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
1774 | vif->bytes_out, vif->pkt_out, |
1775 | vif->flags, vif->local, vif->remote); | |
1776 | } | |
1777 | return 0; | |
1778 | } | |
1779 | ||
f690808e | 1780 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
1781 | .start = ipmr_vif_seq_start, |
1782 | .next = ipmr_vif_seq_next, | |
1783 | .stop = ipmr_vif_seq_stop, | |
1784 | .show = ipmr_vif_seq_show, | |
1785 | }; | |
1786 | ||
1787 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
1788 | { | |
f6bb4514 BT |
1789 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
1790 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
1791 | } |
1792 | ||
9a32144e | 1793 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
1794 | .owner = THIS_MODULE, |
1795 | .open = ipmr_vif_open, | |
1796 | .read = seq_read, | |
1797 | .llseek = seq_lseek, | |
f6bb4514 | 1798 | .release = seq_release_net, |
1da177e4 LT |
1799 | }; |
1800 | ||
1801 | struct ipmr_mfc_iter { | |
f6bb4514 | 1802 | struct seq_net_private p; |
1da177e4 LT |
1803 | struct mfc_cache **cache; |
1804 | int ct; | |
1805 | }; | |
1806 | ||
1807 | ||
f6bb4514 BT |
1808 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
1809 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 LT |
1810 | { |
1811 | struct mfc_cache *mfc; | |
1812 | ||
f6bb4514 | 1813 | it->cache = net->ipv4.mfc_cache_array; |
1da177e4 | 1814 | read_lock(&mrt_lock); |
e905a9ed | 1815 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) |
f6bb4514 | 1816 | for (mfc = net->ipv4.mfc_cache_array[it->ct]; |
2bb8b26c | 1817 | mfc; mfc = mfc->next) |
e905a9ed | 1818 | if (pos-- == 0) |
1da177e4 LT |
1819 | return mfc; |
1820 | read_unlock(&mrt_lock); | |
1821 | ||
1822 | it->cache = &mfc_unres_queue; | |
1823 | spin_lock_bh(&mfc_unres_lock); | |
132adf54 | 1824 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) |
f6bb4514 BT |
1825 | if (net_eq(mfc_net(mfc), net) && |
1826 | pos-- == 0) | |
1da177e4 LT |
1827 | return mfc; |
1828 | spin_unlock_bh(&mfc_unres_lock); | |
1829 | ||
1830 | it->cache = NULL; | |
1831 | return NULL; | |
1832 | } | |
1833 | ||
1834 | ||
1835 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
1836 | { | |
1837 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 BT |
1838 | struct net *net = seq_file_net(seq); |
1839 | ||
1da177e4 LT |
1840 | it->cache = NULL; |
1841 | it->ct = 0; | |
f6bb4514 | 1842 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
1843 | : SEQ_START_TOKEN; |
1844 | } | |
1845 | ||
1846 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1847 | { | |
1848 | struct mfc_cache *mfc = v; | |
1849 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 1850 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1851 | |
1852 | ++*pos; | |
1853 | ||
1854 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 1855 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 LT |
1856 | |
1857 | if (mfc->next) | |
1858 | return mfc->next; | |
e905a9ed YH |
1859 | |
1860 | if (it->cache == &mfc_unres_queue) | |
1da177e4 LT |
1861 | goto end_of_list; |
1862 | ||
f6bb4514 | 1863 | BUG_ON(it->cache != net->ipv4.mfc_cache_array); |
1da177e4 LT |
1864 | |
1865 | while (++it->ct < MFC_LINES) { | |
f6bb4514 | 1866 | mfc = net->ipv4.mfc_cache_array[it->ct]; |
1da177e4 LT |
1867 | if (mfc) |
1868 | return mfc; | |
1869 | } | |
1870 | ||
1871 | /* exhausted cache_array, show unresolved */ | |
1872 | read_unlock(&mrt_lock); | |
1873 | it->cache = &mfc_unres_queue; | |
1874 | it->ct = 0; | |
e905a9ed | 1875 | |
1da177e4 LT |
1876 | spin_lock_bh(&mfc_unres_lock); |
1877 | mfc = mfc_unres_queue; | |
f6bb4514 BT |
1878 | while (mfc && !net_eq(mfc_net(mfc), net)) |
1879 | mfc = mfc->next; | |
e905a9ed | 1880 | if (mfc) |
1da177e4 LT |
1881 | return mfc; |
1882 | ||
1883 | end_of_list: | |
1884 | spin_unlock_bh(&mfc_unres_lock); | |
1885 | it->cache = NULL; | |
1886 | ||
1887 | return NULL; | |
1888 | } | |
1889 | ||
1890 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
1891 | { | |
1892 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 1893 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1894 | |
1895 | if (it->cache == &mfc_unres_queue) | |
1896 | spin_unlock_bh(&mfc_unres_lock); | |
f6bb4514 | 1897 | else if (it->cache == net->ipv4.mfc_cache_array) |
1da177e4 LT |
1898 | read_unlock(&mrt_lock); |
1899 | } | |
1900 | ||
1901 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
1902 | { | |
1903 | int n; | |
f6bb4514 | 1904 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1905 | |
1906 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 1907 | seq_puts(seq, |
1da177e4 LT |
1908 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
1909 | } else { | |
1910 | const struct mfc_cache *mfc = v; | |
1911 | const struct ipmr_mfc_iter *it = seq->private; | |
e905a9ed | 1912 | |
999890b2 | 1913 | seq_printf(seq, "%08lX %08lX %-3hd", |
1da177e4 LT |
1914 | (unsigned long) mfc->mfc_mcastgrp, |
1915 | (unsigned long) mfc->mfc_origin, | |
1ea472e2 | 1916 | mfc->mfc_parent); |
1da177e4 LT |
1917 | |
1918 | if (it->cache != &mfc_unres_queue) { | |
1ea472e2 BT |
1919 | seq_printf(seq, " %8lu %8lu %8lu", |
1920 | mfc->mfc_un.res.pkt, | |
1921 | mfc->mfc_un.res.bytes, | |
1922 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
1923 | for (n = mfc->mfc_un.res.minvif; |
1924 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
f6bb4514 | 1925 | if (VIF_EXISTS(net, n) && |
cf958ae3 BT |
1926 | mfc->mfc_un.res.ttls[n] < 255) |
1927 | seq_printf(seq, | |
e905a9ed | 1928 | " %2d:%-3d", |
1da177e4 LT |
1929 | n, mfc->mfc_un.res.ttls[n]); |
1930 | } | |
1ea472e2 BT |
1931 | } else { |
1932 | /* unresolved mfc_caches don't contain | |
1933 | * pkt, bytes and wrong_if values | |
1934 | */ | |
1935 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
1936 | } |
1937 | seq_putc(seq, '\n'); | |
1938 | } | |
1939 | return 0; | |
1940 | } | |
1941 | ||
f690808e | 1942 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
1943 | .start = ipmr_mfc_seq_start, |
1944 | .next = ipmr_mfc_seq_next, | |
1945 | .stop = ipmr_mfc_seq_stop, | |
1946 | .show = ipmr_mfc_seq_show, | |
1947 | }; | |
1948 | ||
1949 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
1950 | { | |
f6bb4514 BT |
1951 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
1952 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
1953 | } |
1954 | ||
9a32144e | 1955 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
1956 | .owner = THIS_MODULE, |
1957 | .open = ipmr_mfc_open, | |
1958 | .read = seq_read, | |
1959 | .llseek = seq_lseek, | |
f6bb4514 | 1960 | .release = seq_release_net, |
1da177e4 | 1961 | }; |
e905a9ed | 1962 | #endif |
1da177e4 LT |
1963 | |
1964 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 1965 | static const struct net_protocol pim_protocol = { |
1da177e4 | 1966 | .handler = pim_rcv, |
403dbb97 | 1967 | .netns_ok = 1, |
1da177e4 LT |
1968 | }; |
1969 | #endif | |
1970 | ||
1971 | ||
1972 | /* | |
1973 | * Setup for IP multicast routing | |
1974 | */ | |
cf958ae3 BT |
1975 | static int __net_init ipmr_net_init(struct net *net) |
1976 | { | |
1977 | int err = 0; | |
1978 | ||
1979 | net->ipv4.vif_table = kcalloc(MAXVIFS, sizeof(struct vif_device), | |
1980 | GFP_KERNEL); | |
1981 | if (!net->ipv4.vif_table) { | |
1982 | err = -ENOMEM; | |
1983 | goto fail; | |
1984 | } | |
2bb8b26c BT |
1985 | |
1986 | /* Forwarding cache */ | |
1987 | net->ipv4.mfc_cache_array = kcalloc(MFC_LINES, | |
1988 | sizeof(struct mfc_cache *), | |
1989 | GFP_KERNEL); | |
1990 | if (!net->ipv4.mfc_cache_array) { | |
1991 | err = -ENOMEM; | |
1992 | goto fail_mfc_cache; | |
1993 | } | |
6c5143db BT |
1994 | |
1995 | #ifdef CONFIG_IP_PIMSM | |
1996 | net->ipv4.mroute_reg_vif_num = -1; | |
1997 | #endif | |
f6bb4514 BT |
1998 | |
1999 | #ifdef CONFIG_PROC_FS | |
2000 | err = -ENOMEM; | |
2001 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
2002 | goto proc_vif_fail; | |
2003 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
2004 | goto proc_cache_fail; | |
2005 | #endif | |
2bb8b26c BT |
2006 | return 0; |
2007 | ||
f6bb4514 BT |
2008 | #ifdef CONFIG_PROC_FS |
2009 | proc_cache_fail: | |
2010 | proc_net_remove(net, "ip_mr_vif"); | |
2011 | proc_vif_fail: | |
2012 | kfree(net->ipv4.mfc_cache_array); | |
2013 | #endif | |
2bb8b26c BT |
2014 | fail_mfc_cache: |
2015 | kfree(net->ipv4.vif_table); | |
cf958ae3 BT |
2016 | fail: |
2017 | return err; | |
2018 | } | |
2019 | ||
2020 | static void __net_exit ipmr_net_exit(struct net *net) | |
2021 | { | |
f6bb4514 BT |
2022 | #ifdef CONFIG_PROC_FS |
2023 | proc_net_remove(net, "ip_mr_cache"); | |
2024 | proc_net_remove(net, "ip_mr_vif"); | |
2025 | #endif | |
2bb8b26c | 2026 | kfree(net->ipv4.mfc_cache_array); |
cf958ae3 BT |
2027 | kfree(net->ipv4.vif_table); |
2028 | } | |
2029 | ||
2030 | static struct pernet_operations ipmr_net_ops = { | |
2031 | .init = ipmr_net_init, | |
2032 | .exit = ipmr_net_exit, | |
2033 | }; | |
e905a9ed | 2034 | |
03d2f897 | 2035 | int __init ip_mr_init(void) |
1da177e4 | 2036 | { |
03d2f897 WC |
2037 | int err; |
2038 | ||
1da177e4 LT |
2039 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2040 | sizeof(struct mfc_cache), | |
e5d679f3 | 2041 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2042 | NULL); |
03d2f897 WC |
2043 | if (!mrt_cachep) |
2044 | return -ENOMEM; | |
2045 | ||
cf958ae3 BT |
2046 | err = register_pernet_subsys(&ipmr_net_ops); |
2047 | if (err) | |
2048 | goto reg_pernet_fail; | |
2049 | ||
b24b8a24 | 2050 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); |
03d2f897 WC |
2051 | err = register_netdevice_notifier(&ip_mr_notifier); |
2052 | if (err) | |
2053 | goto reg_notif_fail; | |
403dbb97 TG |
2054 | #ifdef CONFIG_IP_PIMSM_V2 |
2055 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
2056 | printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); | |
2057 | err = -EAGAIN; | |
2058 | goto add_proto_fail; | |
2059 | } | |
2060 | #endif | |
03d2f897 | 2061 | return 0; |
f6bb4514 | 2062 | |
403dbb97 TG |
2063 | #ifdef CONFIG_IP_PIMSM_V2 |
2064 | add_proto_fail: | |
2065 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2066 | #endif | |
c3e38896 BT |
2067 | reg_notif_fail: |
2068 | del_timer(&ipmr_expire_timer); | |
cf958ae3 BT |
2069 | unregister_pernet_subsys(&ipmr_net_ops); |
2070 | reg_pernet_fail: | |
c3e38896 | 2071 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2072 | return err; |
1da177e4 | 2073 | } |