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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
113aa838 | 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * Linux Consultancy and Custom Driver Development |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
1da177e4 LT |
12 | * Fixes: |
13 | * Michael Chastain : Incorrect size of copying. | |
14 | * Alan Cox : Added the cache manager code | |
15 | * Alan Cox : Fixed the clone/copy bug and device race. | |
16 | * Mike McLagan : Routing by source | |
17 | * Malcolm Beattie : Buffer handling fixes. | |
18 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
19 | * SVR Anand : Fixed several multicast bugs and problems. | |
20 | * Alexey Kuznetsov : Status, optimisations and more. | |
21 | * Brad Parker : Better behaviour on mrouted upcall | |
22 | * overflow. | |
23 | * Carlos Picoto : PIMv1 Support | |
24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
f77f13e2 | 25 | * Relax this requirement to work with older peers. |
1da177e4 LT |
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> |
f0ad0860 | 66 | #include <net/fib_rules.h> |
1da177e4 LT |
67 | |
68 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
69 | #define CONFIG_IP_PIMSM 1 | |
70 | #endif | |
71 | ||
0c12295a | 72 | struct mr_table { |
f0ad0860 | 73 | struct list_head list; |
8de53dfb PM |
74 | #ifdef CONFIG_NET_NS |
75 | struct net *net; | |
76 | #endif | |
f0ad0860 | 77 | u32 id; |
4c968709 | 78 | struct sock __rcu *mroute_sk; |
0c12295a PM |
79 | struct timer_list ipmr_expire_timer; |
80 | struct list_head mfc_unres_queue; | |
81 | struct list_head mfc_cache_array[MFC_LINES]; | |
82 | struct vif_device vif_table[MAXVIFS]; | |
83 | int maxvif; | |
84 | atomic_t cache_resolve_queue_len; | |
85 | int mroute_do_assert; | |
86 | int mroute_do_pim; | |
87 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
88 | int mroute_reg_vif_num; | |
89 | #endif | |
90 | }; | |
91 | ||
f0ad0860 PM |
92 | struct ipmr_rule { |
93 | struct fib_rule common; | |
94 | }; | |
95 | ||
96 | struct ipmr_result { | |
97 | struct mr_table *mrt; | |
98 | }; | |
99 | ||
1da177e4 LT |
100 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
101 | Note that the changes are semaphored via rtnl_lock. | |
102 | */ | |
103 | ||
104 | static DEFINE_RWLOCK(mrt_lock); | |
105 | ||
106 | /* | |
107 | * Multicast router control variables | |
108 | */ | |
109 | ||
0c12295a | 110 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 LT |
111 | |
112 | /* Special spinlock for queue of unresolved entries */ | |
113 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
114 | ||
115 | /* We return to original Alan's scheme. Hash table of resolved | |
116 | entries is changed only in process context and protected | |
117 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
118 | with strong spinlock mfc_unres_lock. | |
119 | ||
120 | In this case data path is free of exclusive locks at all. | |
121 | */ | |
122 | ||
e18b890b | 123 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 124 | |
f0ad0860 | 125 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
0c12295a PM |
126 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
127 | struct sk_buff *skb, struct mfc_cache *cache, | |
128 | int local); | |
129 | static int ipmr_cache_report(struct mr_table *mrt, | |
4feb88e5 | 130 | struct sk_buff *pkt, vifi_t vifi, int assert); |
cb6a4e46 PM |
131 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
132 | struct mfc_cache *c, struct rtmsg *rtm); | |
f0ad0860 PM |
133 | static void ipmr_expire_process(unsigned long arg); |
134 | ||
135 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
136 | #define ipmr_for_each_table(mrt, net) \ | |
137 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
138 | ||
139 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
140 | { | |
141 | struct mr_table *mrt; | |
142 | ||
143 | ipmr_for_each_table(mrt, net) { | |
144 | if (mrt->id == id) | |
145 | return mrt; | |
146 | } | |
147 | return NULL; | |
148 | } | |
149 | ||
150 | static int ipmr_fib_lookup(struct net *net, struct flowi *flp, | |
151 | struct mr_table **mrt) | |
152 | { | |
153 | struct ipmr_result res; | |
154 | struct fib_lookup_arg arg = { .result = &res, }; | |
155 | int err; | |
156 | ||
157 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, flp, 0, &arg); | |
158 | if (err < 0) | |
159 | return err; | |
160 | *mrt = res.mrt; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
165 | int flags, struct fib_lookup_arg *arg) | |
166 | { | |
167 | struct ipmr_result *res = arg->result; | |
168 | struct mr_table *mrt; | |
1da177e4 | 169 | |
f0ad0860 PM |
170 | switch (rule->action) { |
171 | case FR_ACT_TO_TBL: | |
172 | break; | |
173 | case FR_ACT_UNREACHABLE: | |
174 | return -ENETUNREACH; | |
175 | case FR_ACT_PROHIBIT: | |
176 | return -EACCES; | |
177 | case FR_ACT_BLACKHOLE: | |
178 | default: | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
183 | if (mrt == NULL) | |
184 | return -EAGAIN; | |
185 | res->mrt = mrt; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
190 | { | |
191 | return 1; | |
192 | } | |
193 | ||
194 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
195 | FRA_GENERIC_POLICY, | |
196 | }; | |
197 | ||
198 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
199 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
200 | { | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
205 | struct nlattr **tb) | |
206 | { | |
207 | return 1; | |
208 | } | |
209 | ||
210 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
211 | struct fib_rule_hdr *frh) | |
212 | { | |
213 | frh->dst_len = 0; | |
214 | frh->src_len = 0; | |
215 | frh->tos = 0; | |
216 | return 0; | |
217 | } | |
218 | ||
3d0c9c4e | 219 | static const struct fib_rules_ops __net_initdata ipmr_rules_ops_template = { |
25239cee | 220 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
221 | .rule_size = sizeof(struct ipmr_rule), |
222 | .addr_size = sizeof(u32), | |
223 | .action = ipmr_rule_action, | |
224 | .match = ipmr_rule_match, | |
225 | .configure = ipmr_rule_configure, | |
226 | .compare = ipmr_rule_compare, | |
227 | .default_pref = fib_default_rule_pref, | |
228 | .fill = ipmr_rule_fill, | |
229 | .nlgroup = RTNLGRP_IPV4_RULE, | |
230 | .policy = ipmr_rule_policy, | |
231 | .owner = THIS_MODULE, | |
232 | }; | |
233 | ||
234 | static int __net_init ipmr_rules_init(struct net *net) | |
235 | { | |
236 | struct fib_rules_ops *ops; | |
237 | struct mr_table *mrt; | |
238 | int err; | |
239 | ||
240 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
241 | if (IS_ERR(ops)) | |
242 | return PTR_ERR(ops); | |
243 | ||
244 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
245 | ||
246 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
247 | if (mrt == NULL) { | |
248 | err = -ENOMEM; | |
249 | goto err1; | |
250 | } | |
251 | ||
252 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
253 | if (err < 0) | |
254 | goto err2; | |
255 | ||
256 | net->ipv4.mr_rules_ops = ops; | |
257 | return 0; | |
258 | ||
259 | err2: | |
260 | kfree(mrt); | |
261 | err1: | |
262 | fib_rules_unregister(ops); | |
263 | return err; | |
264 | } | |
265 | ||
266 | static void __net_exit ipmr_rules_exit(struct net *net) | |
267 | { | |
268 | struct mr_table *mrt, *next; | |
269 | ||
035320d5 ED |
270 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
271 | list_del(&mrt->list); | |
f0ad0860 | 272 | kfree(mrt); |
035320d5 | 273 | } |
f0ad0860 PM |
274 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
275 | } | |
276 | #else | |
277 | #define ipmr_for_each_table(mrt, net) \ | |
278 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
279 | ||
280 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
281 | { | |
282 | return net->ipv4.mrt; | |
283 | } | |
284 | ||
285 | static int ipmr_fib_lookup(struct net *net, struct flowi *flp, | |
286 | struct mr_table **mrt) | |
287 | { | |
288 | *mrt = net->ipv4.mrt; | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static int __net_init ipmr_rules_init(struct net *net) | |
293 | { | |
294 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
295 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
296 | } | |
297 | ||
298 | static void __net_exit ipmr_rules_exit(struct net *net) | |
299 | { | |
300 | kfree(net->ipv4.mrt); | |
301 | } | |
302 | #endif | |
303 | ||
304 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
305 | { | |
306 | struct mr_table *mrt; | |
307 | unsigned int i; | |
1da177e4 | 308 | |
f0ad0860 PM |
309 | mrt = ipmr_get_table(net, id); |
310 | if (mrt != NULL) | |
311 | return mrt; | |
312 | ||
313 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
314 | if (mrt == NULL) | |
315 | return NULL; | |
8de53dfb | 316 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
317 | mrt->id = id; |
318 | ||
319 | /* Forwarding cache */ | |
320 | for (i = 0; i < MFC_LINES; i++) | |
321 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
322 | ||
323 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
324 | ||
325 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
326 | (unsigned long)mrt); | |
327 | ||
328 | #ifdef CONFIG_IP_PIMSM | |
329 | mrt->mroute_reg_vif_num = -1; | |
330 | #endif | |
331 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
332 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
333 | #endif | |
334 | return mrt; | |
335 | } | |
1da177e4 LT |
336 | |
337 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
338 | ||
d607032d WC |
339 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
340 | { | |
4feb88e5 BT |
341 | struct net *net = dev_net(dev); |
342 | ||
d607032d WC |
343 | dev_close(dev); |
344 | ||
4feb88e5 | 345 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 346 | if (dev) { |
5bc3eb7e | 347 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 348 | struct ifreq ifr; |
d607032d WC |
349 | struct ip_tunnel_parm p; |
350 | ||
351 | memset(&p, 0, sizeof(p)); | |
352 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
353 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
354 | p.iph.version = 4; | |
355 | p.iph.ihl = 5; | |
356 | p.iph.protocol = IPPROTO_IPIP; | |
357 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
358 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
359 | ||
5bc3eb7e SH |
360 | if (ops->ndo_do_ioctl) { |
361 | mm_segment_t oldfs = get_fs(); | |
362 | ||
363 | set_fs(KERNEL_DS); | |
364 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
365 | set_fs(oldfs); | |
366 | } | |
d607032d WC |
367 | } |
368 | } | |
369 | ||
1da177e4 | 370 | static |
4feb88e5 | 371 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
372 | { |
373 | struct net_device *dev; | |
374 | ||
4feb88e5 | 375 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
376 | |
377 | if (dev) { | |
5bc3eb7e | 378 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
379 | int err; |
380 | struct ifreq ifr; | |
1da177e4 LT |
381 | struct ip_tunnel_parm p; |
382 | struct in_device *in_dev; | |
383 | ||
384 | memset(&p, 0, sizeof(p)); | |
385 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
386 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
387 | p.iph.version = 4; | |
388 | p.iph.ihl = 5; | |
389 | p.iph.protocol = IPPROTO_IPIP; | |
390 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 391 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 392 | |
5bc3eb7e SH |
393 | if (ops->ndo_do_ioctl) { |
394 | mm_segment_t oldfs = get_fs(); | |
395 | ||
396 | set_fs(KERNEL_DS); | |
397 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
398 | set_fs(oldfs); | |
399 | } else | |
400 | err = -EOPNOTSUPP; | |
1da177e4 LT |
401 | |
402 | dev = NULL; | |
403 | ||
4feb88e5 BT |
404 | if (err == 0 && |
405 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
406 | dev->flags |= IFF_MULTICAST; |
407 | ||
e5ed6399 | 408 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 409 | if (in_dev == NULL) |
1da177e4 | 410 | goto failure; |
71e27da9 HX |
411 | |
412 | ipv4_devconf_setall(in_dev); | |
413 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
414 | |
415 | if (dev_open(dev)) | |
416 | goto failure; | |
7dc00c82 | 417 | dev_hold(dev); |
1da177e4 LT |
418 | } |
419 | } | |
420 | return dev; | |
421 | ||
422 | failure: | |
423 | /* allow the register to be completed before unregistering. */ | |
424 | rtnl_unlock(); | |
425 | rtnl_lock(); | |
426 | ||
427 | unregister_netdevice(dev); | |
428 | return NULL; | |
429 | } | |
430 | ||
431 | #ifdef CONFIG_IP_PIMSM | |
432 | ||
6fef4c0c | 433 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 434 | { |
4feb88e5 | 435 | struct net *net = dev_net(dev); |
f0ad0860 PM |
436 | struct mr_table *mrt; |
437 | struct flowi fl = { | |
438 | .oif = dev->ifindex, | |
439 | .iif = skb->skb_iif, | |
440 | .mark = skb->mark, | |
441 | }; | |
442 | int err; | |
443 | ||
444 | err = ipmr_fib_lookup(net, &fl, &mrt); | |
e40dbc51 BG |
445 | if (err < 0) { |
446 | kfree_skb(skb); | |
f0ad0860 | 447 | return err; |
e40dbc51 | 448 | } |
4feb88e5 | 449 | |
1da177e4 | 450 | read_lock(&mrt_lock); |
cf3677ae PE |
451 | dev->stats.tx_bytes += skb->len; |
452 | dev->stats.tx_packets++; | |
0c12295a | 453 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
454 | read_unlock(&mrt_lock); |
455 | kfree_skb(skb); | |
6ed10654 | 456 | return NETDEV_TX_OK; |
1da177e4 LT |
457 | } |
458 | ||
007c3838 SH |
459 | static const struct net_device_ops reg_vif_netdev_ops = { |
460 | .ndo_start_xmit = reg_vif_xmit, | |
461 | }; | |
462 | ||
1da177e4 LT |
463 | static void reg_vif_setup(struct net_device *dev) |
464 | { | |
465 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 466 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 467 | dev->flags = IFF_NOARP; |
007c3838 | 468 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 | 469 | dev->destructor = free_netdev; |
403dbb97 | 470 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
471 | } |
472 | ||
f0ad0860 | 473 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
474 | { |
475 | struct net_device *dev; | |
476 | struct in_device *in_dev; | |
f0ad0860 | 477 | char name[IFNAMSIZ]; |
1da177e4 | 478 | |
f0ad0860 PM |
479 | if (mrt->id == RT_TABLE_DEFAULT) |
480 | sprintf(name, "pimreg"); | |
481 | else | |
482 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 483 | |
f0ad0860 | 484 | dev = alloc_netdev(0, name, reg_vif_setup); |
1da177e4 LT |
485 | |
486 | if (dev == NULL) | |
487 | return NULL; | |
488 | ||
403dbb97 TG |
489 | dev_net_set(dev, net); |
490 | ||
1da177e4 LT |
491 | if (register_netdevice(dev)) { |
492 | free_netdev(dev); | |
493 | return NULL; | |
494 | } | |
495 | dev->iflink = 0; | |
496 | ||
71e27da9 HX |
497 | rcu_read_lock(); |
498 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
499 | rcu_read_unlock(); | |
1da177e4 | 500 | goto failure; |
71e27da9 | 501 | } |
1da177e4 | 502 | |
71e27da9 HX |
503 | ipv4_devconf_setall(in_dev); |
504 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
505 | rcu_read_unlock(); | |
1da177e4 LT |
506 | |
507 | if (dev_open(dev)) | |
508 | goto failure; | |
509 | ||
7dc00c82 WC |
510 | dev_hold(dev); |
511 | ||
1da177e4 LT |
512 | return dev; |
513 | ||
514 | failure: | |
515 | /* allow the register to be completed before unregistering. */ | |
516 | rtnl_unlock(); | |
517 | rtnl_lock(); | |
518 | ||
519 | unregister_netdevice(dev); | |
520 | return NULL; | |
521 | } | |
522 | #endif | |
523 | ||
524 | /* | |
525 | * Delete a VIF entry | |
7dc00c82 | 526 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 527 | */ |
e905a9ed | 528 | |
0c12295a | 529 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 530 | struct list_head *head) |
1da177e4 LT |
531 | { |
532 | struct vif_device *v; | |
533 | struct net_device *dev; | |
534 | struct in_device *in_dev; | |
535 | ||
0c12295a | 536 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
537 | return -EADDRNOTAVAIL; |
538 | ||
0c12295a | 539 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
540 | |
541 | write_lock_bh(&mrt_lock); | |
542 | dev = v->dev; | |
543 | v->dev = NULL; | |
544 | ||
545 | if (!dev) { | |
546 | write_unlock_bh(&mrt_lock); | |
547 | return -EADDRNOTAVAIL; | |
548 | } | |
549 | ||
550 | #ifdef CONFIG_IP_PIMSM | |
0c12295a PM |
551 | if (vifi == mrt->mroute_reg_vif_num) |
552 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 LT |
553 | #endif |
554 | ||
0c12295a | 555 | if (vifi+1 == mrt->maxvif) { |
1da177e4 LT |
556 | int tmp; |
557 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
0c12295a | 558 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
559 | break; |
560 | } | |
0c12295a | 561 | mrt->maxvif = tmp+1; |
1da177e4 LT |
562 | } |
563 | ||
564 | write_unlock_bh(&mrt_lock); | |
565 | ||
566 | dev_set_allmulti(dev, -1); | |
567 | ||
e5ed6399 | 568 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 569 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
570 | ip_rt_multicast_event(in_dev); |
571 | } | |
572 | ||
7dc00c82 | 573 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
d17fa6fa | 574 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
575 | |
576 | dev_put(dev); | |
577 | return 0; | |
578 | } | |
579 | ||
a8c9486b | 580 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 581 | { |
a8c9486b ED |
582 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
583 | ||
5c0a66f5 BT |
584 | kmem_cache_free(mrt_cachep, c); |
585 | } | |
586 | ||
a8c9486b ED |
587 | static inline void ipmr_cache_free(struct mfc_cache *c) |
588 | { | |
589 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
590 | } | |
591 | ||
1da177e4 LT |
592 | /* Destroy an unresolved cache entry, killing queued skbs |
593 | and reporting error to netlink readers. | |
594 | */ | |
595 | ||
0c12295a | 596 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 597 | { |
8de53dfb | 598 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 599 | struct sk_buff *skb; |
9ef1d4c7 | 600 | struct nlmsgerr *e; |
1da177e4 | 601 | |
0c12295a | 602 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 603 | |
c354e124 | 604 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 605 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
606 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
607 | nlh->nlmsg_type = NLMSG_ERROR; | |
608 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
609 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
610 | e = NLMSG_DATA(nlh); |
611 | e->error = -ETIMEDOUT; | |
612 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 613 | |
4feb88e5 | 614 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 LT |
615 | } else |
616 | kfree_skb(skb); | |
617 | } | |
618 | ||
5c0a66f5 | 619 | ipmr_cache_free(c); |
1da177e4 LT |
620 | } |
621 | ||
622 | ||
e258beb2 | 623 | /* Timer process for the unresolved queue. */ |
1da177e4 | 624 | |
e258beb2 | 625 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 626 | { |
0c12295a | 627 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
628 | unsigned long now; |
629 | unsigned long expires; | |
862465f2 | 630 | struct mfc_cache *c, *next; |
1da177e4 LT |
631 | |
632 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 633 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
634 | return; |
635 | } | |
636 | ||
0c12295a | 637 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
638 | goto out; |
639 | ||
640 | now = jiffies; | |
641 | expires = 10*HZ; | |
1da177e4 | 642 | |
0c12295a | 643 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
644 | if (time_after(c->mfc_un.unres.expires, now)) { |
645 | unsigned long interval = c->mfc_un.unres.expires - now; | |
646 | if (interval < expires) | |
647 | expires = interval; | |
1da177e4 LT |
648 | continue; |
649 | } | |
650 | ||
862465f2 | 651 | list_del(&c->list); |
0c12295a | 652 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
653 | } |
654 | ||
0c12295a PM |
655 | if (!list_empty(&mrt->mfc_unres_queue)) |
656 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
657 | |
658 | out: | |
659 | spin_unlock(&mfc_unres_lock); | |
660 | } | |
661 | ||
662 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
663 | ||
0c12295a | 664 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 665 | unsigned char *ttls) |
1da177e4 LT |
666 | { |
667 | int vifi; | |
668 | ||
669 | cache->mfc_un.res.minvif = MAXVIFS; | |
670 | cache->mfc_un.res.maxvif = 0; | |
671 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
672 | ||
0c12295a PM |
673 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
674 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 675 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
676 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
677 | if (cache->mfc_un.res.minvif > vifi) | |
678 | cache->mfc_un.res.minvif = vifi; | |
679 | if (cache->mfc_un.res.maxvif <= vifi) | |
680 | cache->mfc_un.res.maxvif = vifi + 1; | |
681 | } | |
682 | } | |
683 | } | |
684 | ||
0c12295a PM |
685 | static int vif_add(struct net *net, struct mr_table *mrt, |
686 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
687 | { |
688 | int vifi = vifc->vifc_vifi; | |
0c12295a | 689 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
690 | struct net_device *dev; |
691 | struct in_device *in_dev; | |
d607032d | 692 | int err; |
1da177e4 LT |
693 | |
694 | /* Is vif busy ? */ | |
0c12295a | 695 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
696 | return -EADDRINUSE; |
697 | ||
698 | switch (vifc->vifc_flags) { | |
699 | #ifdef CONFIG_IP_PIMSM | |
700 | case VIFF_REGISTER: | |
701 | /* | |
702 | * Special Purpose VIF in PIM | |
703 | * All the packets will be sent to the daemon | |
704 | */ | |
0c12295a | 705 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 706 | return -EADDRINUSE; |
f0ad0860 | 707 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
708 | if (!dev) |
709 | return -ENOBUFS; | |
d607032d WC |
710 | err = dev_set_allmulti(dev, 1); |
711 | if (err) { | |
712 | unregister_netdevice(dev); | |
7dc00c82 | 713 | dev_put(dev); |
d607032d WC |
714 | return err; |
715 | } | |
1da177e4 LT |
716 | break; |
717 | #endif | |
e905a9ed | 718 | case VIFF_TUNNEL: |
4feb88e5 | 719 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
720 | if (!dev) |
721 | return -ENOBUFS; | |
d607032d WC |
722 | err = dev_set_allmulti(dev, 1); |
723 | if (err) { | |
724 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 725 | dev_put(dev); |
d607032d WC |
726 | return err; |
727 | } | |
1da177e4 | 728 | break; |
ee5e81f0 I |
729 | |
730 | case VIFF_USE_IFINDEX: | |
1da177e4 | 731 | case 0: |
ee5e81f0 I |
732 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
733 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
95ae6b22 | 734 | if (dev && __in_dev_get_rtnl(dev) == NULL) { |
ee5e81f0 I |
735 | dev_put(dev); |
736 | return -EADDRNOTAVAIL; | |
737 | } | |
738 | } else | |
739 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); | |
740 | ||
1da177e4 LT |
741 | if (!dev) |
742 | return -EADDRNOTAVAIL; | |
d607032d | 743 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
744 | if (err) { |
745 | dev_put(dev); | |
d607032d | 746 | return err; |
7dc00c82 | 747 | } |
1da177e4 LT |
748 | break; |
749 | default: | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
d0490cfd DC |
753 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
754 | dev_put(dev); | |
1da177e4 | 755 | return -EADDRNOTAVAIL; |
d0490cfd | 756 | } |
42f811b8 | 757 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
758 | ip_rt_multicast_event(in_dev); |
759 | ||
760 | /* | |
761 | * Fill in the VIF structures | |
762 | */ | |
c354e124 JK |
763 | v->rate_limit = vifc->vifc_rate_limit; |
764 | v->local = vifc->vifc_lcl_addr.s_addr; | |
765 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
766 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
767 | if (!mrtsock) |
768 | v->flags |= VIFF_STATIC; | |
c354e124 | 769 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
770 | v->bytes_in = 0; |
771 | v->bytes_out = 0; | |
772 | v->pkt_in = 0; | |
773 | v->pkt_out = 0; | |
774 | v->link = dev->ifindex; | |
775 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
776 | v->link = dev->iflink; | |
777 | ||
778 | /* And finish update writing critical data */ | |
779 | write_lock_bh(&mrt_lock); | |
c354e124 | 780 | v->dev = dev; |
1da177e4 LT |
781 | #ifdef CONFIG_IP_PIMSM |
782 | if (v->flags&VIFF_REGISTER) | |
0c12295a | 783 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 784 | #endif |
0c12295a PM |
785 | if (vifi+1 > mrt->maxvif) |
786 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
787 | write_unlock_bh(&mrt_lock); |
788 | return 0; | |
789 | } | |
790 | ||
a8c9486b | 791 | /* called with rcu_read_lock() */ |
0c12295a | 792 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
793 | __be32 origin, |
794 | __be32 mcastgrp) | |
1da177e4 | 795 | { |
c354e124 | 796 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
797 | struct mfc_cache *c; |
798 | ||
a8c9486b | 799 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
800 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
801 | return c; | |
1da177e4 | 802 | } |
862465f2 | 803 | return NULL; |
1da177e4 LT |
804 | } |
805 | ||
806 | /* | |
807 | * Allocate a multicast cache entry | |
808 | */ | |
d658f8a0 | 809 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 810 | { |
c354e124 | 811 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b ED |
812 | |
813 | if (c) | |
814 | c->mfc_un.res.minvif = MAXVIFS; | |
1da177e4 LT |
815 | return c; |
816 | } | |
817 | ||
d658f8a0 | 818 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 819 | { |
c354e124 | 820 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
821 | |
822 | if (c) { | |
823 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
824 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
825 | } | |
1da177e4 LT |
826 | return c; |
827 | } | |
828 | ||
829 | /* | |
830 | * A cache entry has gone into a resolved state from queued | |
831 | */ | |
e905a9ed | 832 | |
0c12295a PM |
833 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
834 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
835 | { |
836 | struct sk_buff *skb; | |
9ef1d4c7 | 837 | struct nlmsgerr *e; |
1da177e4 LT |
838 | |
839 | /* | |
840 | * Play the pending entries through our router | |
841 | */ | |
842 | ||
c354e124 | 843 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 844 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
845 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
846 | ||
cb6a4e46 | 847 | if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
27a884dc ACM |
848 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
849 | (u8 *)nlh); | |
1da177e4 LT |
850 | } else { |
851 | nlh->nlmsg_type = NLMSG_ERROR; | |
852 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
853 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
854 | e = NLMSG_DATA(nlh); |
855 | e->error = -EMSGSIZE; | |
856 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 857 | } |
2942e900 | 858 | |
d658f8a0 | 859 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 | 860 | } else |
0c12295a | 861 | ip_mr_forward(net, mrt, skb, c, 0); |
1da177e4 LT |
862 | } |
863 | } | |
864 | ||
865 | /* | |
866 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
867 | * expects the following bizarre scheme. | |
868 | * | |
869 | * Called under mrt_lock. | |
870 | */ | |
e905a9ed | 871 | |
0c12295a | 872 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 873 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
874 | { |
875 | struct sk_buff *skb; | |
c9bdd4b5 | 876 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
877 | struct igmphdr *igmp; |
878 | struct igmpmsg *msg; | |
4c968709 | 879 | struct sock *mroute_sk; |
1da177e4 LT |
880 | int ret; |
881 | ||
882 | #ifdef CONFIG_IP_PIMSM | |
883 | if (assert == IGMPMSG_WHOLEPKT) | |
884 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
885 | else | |
886 | #endif | |
887 | skb = alloc_skb(128, GFP_ATOMIC); | |
888 | ||
132adf54 | 889 | if (!skb) |
1da177e4 LT |
890 | return -ENOBUFS; |
891 | ||
892 | #ifdef CONFIG_IP_PIMSM | |
893 | if (assert == IGMPMSG_WHOLEPKT) { | |
894 | /* Ugly, but we have no choice with this interface. | |
895 | Duplicate old header, fix ihl, length etc. | |
896 | And all this only to mangle msg->im_msgtype and | |
897 | to set msg->im_mbz to "mbz" :-) | |
898 | */ | |
878c8145 ACM |
899 | skb_push(skb, sizeof(struct iphdr)); |
900 | skb_reset_network_header(skb); | |
badff6d0 | 901 | skb_reset_transport_header(skb); |
0272ffc4 | 902 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 903 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
904 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
905 | msg->im_mbz = 0; | |
0c12295a | 906 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
907 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
908 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
909 | sizeof(struct iphdr)); | |
e905a9ed | 910 | } else |
1da177e4 | 911 | #endif |
e905a9ed YH |
912 | { |
913 | ||
1da177e4 LT |
914 | /* |
915 | * Copy the IP header | |
916 | */ | |
917 | ||
27a884dc | 918 | skb->network_header = skb->tail; |
ddc7b8e3 | 919 | skb_put(skb, ihl); |
27d7ff46 | 920 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
921 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
922 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 | 923 | msg->im_vif = vifi; |
adf30907 | 924 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 LT |
925 | |
926 | /* | |
927 | * Add our header | |
928 | */ | |
929 | ||
c354e124 | 930 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
931 | igmp->type = |
932 | msg->im_msgtype = assert; | |
933 | igmp->code = 0; | |
eddc9ec5 | 934 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 935 | skb->transport_header = skb->network_header; |
e905a9ed | 936 | } |
1da177e4 | 937 | |
4c968709 ED |
938 | rcu_read_lock(); |
939 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
940 | if (mroute_sk == NULL) { | |
941 | rcu_read_unlock(); | |
1da177e4 LT |
942 | kfree_skb(skb); |
943 | return -EINVAL; | |
944 | } | |
945 | ||
946 | /* | |
947 | * Deliver to mrouted | |
948 | */ | |
4c968709 ED |
949 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
950 | rcu_read_unlock(); | |
70a269e6 | 951 | if (ret < 0) { |
1da177e4 LT |
952 | if (net_ratelimit()) |
953 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
954 | kfree_skb(skb); | |
955 | } | |
956 | ||
957 | return ret; | |
958 | } | |
959 | ||
960 | /* | |
961 | * Queue a packet for resolution. It gets locked cache entry! | |
962 | */ | |
e905a9ed | 963 | |
1da177e4 | 964 | static int |
0c12295a | 965 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 966 | { |
862465f2 | 967 | bool found = false; |
1da177e4 LT |
968 | int err; |
969 | struct mfc_cache *c; | |
eddc9ec5 | 970 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
971 | |
972 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 973 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 974 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
975 | c->mfc_origin == iph->saddr) { |
976 | found = true; | |
1da177e4 | 977 | break; |
862465f2 | 978 | } |
1da177e4 LT |
979 | } |
980 | ||
862465f2 | 981 | if (!found) { |
1da177e4 LT |
982 | /* |
983 | * Create a new entry if allowable | |
984 | */ | |
985 | ||
0c12295a | 986 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 987 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
988 | spin_unlock_bh(&mfc_unres_lock); |
989 | ||
990 | kfree_skb(skb); | |
991 | return -ENOBUFS; | |
992 | } | |
993 | ||
994 | /* | |
995 | * Fill in the new cache entry | |
996 | */ | |
eddc9ec5 ACM |
997 | c->mfc_parent = -1; |
998 | c->mfc_origin = iph->saddr; | |
999 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
1000 | |
1001 | /* | |
1002 | * Reflect first query at mrouted. | |
1003 | */ | |
0c12295a | 1004 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1005 | if (err < 0) { |
e905a9ed | 1006 | /* If the report failed throw the cache entry |
1da177e4 LT |
1007 | out - Brad Parker |
1008 | */ | |
1009 | spin_unlock_bh(&mfc_unres_lock); | |
1010 | ||
5c0a66f5 | 1011 | ipmr_cache_free(c); |
1da177e4 LT |
1012 | kfree_skb(skb); |
1013 | return err; | |
1014 | } | |
1015 | ||
0c12295a PM |
1016 | atomic_inc(&mrt->cache_resolve_queue_len); |
1017 | list_add(&c->list, &mrt->mfc_unres_queue); | |
1da177e4 | 1018 | |
278554bd DM |
1019 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1020 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | /* | |
1024 | * See if we can append the packet | |
1025 | */ | |
1026 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
1027 | kfree_skb(skb); | |
1028 | err = -ENOBUFS; | |
1029 | } else { | |
c354e124 | 1030 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1031 | err = 0; |
1032 | } | |
1033 | ||
1034 | spin_unlock_bh(&mfc_unres_lock); | |
1035 | return err; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * MFC cache manipulation by user space mroute daemon | |
1040 | */ | |
1041 | ||
0c12295a | 1042 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc) |
1da177e4 LT |
1043 | { |
1044 | int line; | |
862465f2 | 1045 | struct mfc_cache *c, *next; |
1da177e4 | 1046 | |
c354e124 | 1047 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1048 | |
0c12295a | 1049 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 LT |
1050 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
1051 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
a8c9486b | 1052 | list_del_rcu(&c->list); |
1da177e4 | 1053 | |
5c0a66f5 | 1054 | ipmr_cache_free(c); |
1da177e4 LT |
1055 | return 0; |
1056 | } | |
1057 | } | |
1058 | return -ENOENT; | |
1059 | } | |
1060 | ||
0c12295a PM |
1061 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
1062 | struct mfcctl *mfc, int mrtsock) | |
1da177e4 | 1063 | { |
862465f2 | 1064 | bool found = false; |
1da177e4 | 1065 | int line; |
862465f2 | 1066 | struct mfc_cache *uc, *c; |
1da177e4 | 1067 | |
a50436f2 PM |
1068 | if (mfc->mfcc_parent >= MAXVIFS) |
1069 | return -ENFILE; | |
1070 | ||
c354e124 | 1071 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1072 | |
0c12295a | 1073 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1074 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
862465f2 PM |
1075 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { |
1076 | found = true; | |
1da177e4 | 1077 | break; |
862465f2 | 1078 | } |
1da177e4 LT |
1079 | } |
1080 | ||
862465f2 | 1081 | if (found) { |
1da177e4 LT |
1082 | write_lock_bh(&mrt_lock); |
1083 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1084 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1085 | if (!mrtsock) |
1086 | c->mfc_flags |= MFC_STATIC; | |
1087 | write_unlock_bh(&mrt_lock); | |
1088 | return 0; | |
1089 | } | |
1090 | ||
f97c1e0c | 1091 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1092 | return -EINVAL; |
1093 | ||
d658f8a0 | 1094 | c = ipmr_cache_alloc(); |
c354e124 | 1095 | if (c == NULL) |
1da177e4 LT |
1096 | return -ENOMEM; |
1097 | ||
c354e124 JK |
1098 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1099 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1100 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1101 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1102 | if (!mrtsock) |
1103 | c->mfc_flags |= MFC_STATIC; | |
1104 | ||
a8c9486b | 1105 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1106 | |
1107 | /* | |
1108 | * Check to see if we resolved a queued list. If so we | |
1109 | * need to send on the frames and tidy up. | |
1110 | */ | |
b0ebb739 | 1111 | found = false; |
1da177e4 | 1112 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1113 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1114 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1115 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1116 | list_del(&uc->list); |
0c12295a | 1117 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1118 | found = true; |
1da177e4 LT |
1119 | break; |
1120 | } | |
1121 | } | |
0c12295a PM |
1122 | if (list_empty(&mrt->mfc_unres_queue)) |
1123 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1124 | spin_unlock_bh(&mfc_unres_lock); |
1125 | ||
b0ebb739 | 1126 | if (found) { |
0c12295a | 1127 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1128 | ipmr_cache_free(uc); |
1da177e4 LT |
1129 | } |
1130 | return 0; | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Close the multicast socket, and clear the vif tables etc | |
1135 | */ | |
e905a9ed | 1136 | |
0c12295a | 1137 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1138 | { |
1139 | int i; | |
d17fa6fa | 1140 | LIST_HEAD(list); |
862465f2 | 1141 | struct mfc_cache *c, *next; |
e905a9ed | 1142 | |
1da177e4 LT |
1143 | /* |
1144 | * Shut down all active vif entries | |
1145 | */ | |
0c12295a PM |
1146 | for (i = 0; i < mrt->maxvif; i++) { |
1147 | if (!(mrt->vif_table[i].flags&VIFF_STATIC)) | |
1148 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1149 | } |
d17fa6fa | 1150 | unregister_netdevice_many(&list); |
1da177e4 LT |
1151 | |
1152 | /* | |
1153 | * Wipe the cache | |
1154 | */ | |
862465f2 | 1155 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1156 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
a8c9486b | 1157 | if (c->mfc_flags & MFC_STATIC) |
1da177e4 | 1158 | continue; |
a8c9486b | 1159 | list_del_rcu(&c->list); |
5c0a66f5 | 1160 | ipmr_cache_free(c); |
1da177e4 LT |
1161 | } |
1162 | } | |
1163 | ||
0c12295a | 1164 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1165 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1166 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1167 | list_del(&c->list); |
0c12295a | 1168 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1169 | } |
1170 | spin_unlock_bh(&mfc_unres_lock); | |
1171 | } | |
1172 | } | |
1173 | ||
4c968709 ED |
1174 | /* called from ip_ra_control(), before an RCU grace period, |
1175 | * we dont need to call synchronize_rcu() here | |
1176 | */ | |
1da177e4 LT |
1177 | static void mrtsock_destruct(struct sock *sk) |
1178 | { | |
4feb88e5 | 1179 | struct net *net = sock_net(sk); |
f0ad0860 | 1180 | struct mr_table *mrt; |
4feb88e5 | 1181 | |
1da177e4 | 1182 | rtnl_lock(); |
f0ad0860 | 1183 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1184 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1185 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
4c968709 | 1186 | rcu_assign_pointer(mrt->mroute_sk, NULL); |
f0ad0860 PM |
1187 | mroute_clean_tables(mrt); |
1188 | } | |
1da177e4 LT |
1189 | } |
1190 | rtnl_unlock(); | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * Socket options and virtual interface manipulation. The whole | |
1195 | * virtual interface system is a complete heap, but unfortunately | |
1196 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1197 | * MOSPF/PIM router set up we can clean this up. | |
1198 | */ | |
e905a9ed | 1199 | |
b7058842 | 1200 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1201 | { |
1202 | int ret; | |
1203 | struct vifctl vif; | |
1204 | struct mfcctl mfc; | |
4feb88e5 | 1205 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1206 | struct mr_table *mrt; |
1207 | ||
1208 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1209 | if (mrt == NULL) | |
1210 | return -ENOENT; | |
e905a9ed | 1211 | |
132adf54 | 1212 | if (optname != MRT_INIT) { |
4c968709 ED |
1213 | if (sk != rcu_dereference_raw(mrt->mroute_sk) && |
1214 | !capable(CAP_NET_ADMIN)) | |
1da177e4 LT |
1215 | return -EACCES; |
1216 | } | |
1217 | ||
132adf54 SH |
1218 | switch (optname) { |
1219 | case MRT_INIT: | |
1220 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1221 | inet_sk(sk)->inet_num != IPPROTO_IGMP) |
132adf54 | 1222 | return -EOPNOTSUPP; |
c354e124 | 1223 | if (optlen != sizeof(int)) |
132adf54 | 1224 | return -ENOPROTOOPT; |
1da177e4 | 1225 | |
132adf54 | 1226 | rtnl_lock(); |
4c968709 | 1227 | if (rtnl_dereference(mrt->mroute_sk)) { |
1da177e4 | 1228 | rtnl_unlock(); |
132adf54 SH |
1229 | return -EADDRINUSE; |
1230 | } | |
1231 | ||
1232 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1233 | if (ret == 0) { | |
4c968709 | 1234 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1235 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
132adf54 SH |
1236 | } |
1237 | rtnl_unlock(); | |
1238 | return ret; | |
1239 | case MRT_DONE: | |
4c968709 | 1240 | if (sk != rcu_dereference_raw(mrt->mroute_sk)) |
132adf54 SH |
1241 | return -EACCES; |
1242 | return ip_ra_control(sk, 0, NULL); | |
1243 | case MRT_ADD_VIF: | |
1244 | case MRT_DEL_VIF: | |
c354e124 | 1245 | if (optlen != sizeof(vif)) |
132adf54 | 1246 | return -EINVAL; |
c354e124 | 1247 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1248 | return -EFAULT; |
1249 | if (vif.vifc_vifi >= MAXVIFS) | |
1250 | return -ENFILE; | |
1251 | rtnl_lock(); | |
c354e124 | 1252 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1253 | ret = vif_add(net, mrt, &vif, |
1254 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1255 | } else { |
0c12295a | 1256 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1257 | } |
1258 | rtnl_unlock(); | |
1259 | return ret; | |
1da177e4 LT |
1260 | |
1261 | /* | |
1262 | * Manipulate the forwarding caches. These live | |
1263 | * in a sort of kernel/user symbiosis. | |
1264 | */ | |
132adf54 SH |
1265 | case MRT_ADD_MFC: |
1266 | case MRT_DEL_MFC: | |
c354e124 | 1267 | if (optlen != sizeof(mfc)) |
132adf54 | 1268 | return -EINVAL; |
c354e124 | 1269 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
1270 | return -EFAULT; |
1271 | rtnl_lock(); | |
c354e124 | 1272 | if (optname == MRT_DEL_MFC) |
0c12295a | 1273 | ret = ipmr_mfc_delete(mrt, &mfc); |
132adf54 | 1274 | else |
4c968709 ED |
1275 | ret = ipmr_mfc_add(net, mrt, &mfc, |
1276 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 SH |
1277 | rtnl_unlock(); |
1278 | return ret; | |
1da177e4 LT |
1279 | /* |
1280 | * Control PIM assert. | |
1281 | */ | |
132adf54 SH |
1282 | case MRT_ASSERT: |
1283 | { | |
1284 | int v; | |
1285 | if (get_user(v,(int __user *)optval)) | |
1286 | return -EFAULT; | |
0c12295a | 1287 | mrt->mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1288 | return 0; |
1289 | } | |
1da177e4 | 1290 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1291 | case MRT_PIM: |
1292 | { | |
ba93ef74 SH |
1293 | int v; |
1294 | ||
132adf54 SH |
1295 | if (get_user(v,(int __user *)optval)) |
1296 | return -EFAULT; | |
ba93ef74 SH |
1297 | v = (v) ? 1 : 0; |
1298 | ||
132adf54 SH |
1299 | rtnl_lock(); |
1300 | ret = 0; | |
0c12295a PM |
1301 | if (v != mrt->mroute_do_pim) { |
1302 | mrt->mroute_do_pim = v; | |
1303 | mrt->mroute_do_assert = v; | |
1da177e4 | 1304 | } |
132adf54 SH |
1305 | rtnl_unlock(); |
1306 | return ret; | |
1307 | } | |
f0ad0860 PM |
1308 | #endif |
1309 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1310 | case MRT_TABLE: | |
1311 | { | |
1312 | u32 v; | |
1313 | ||
1314 | if (optlen != sizeof(u32)) | |
1315 | return -EINVAL; | |
1316 | if (get_user(v, (u32 __user *)optval)) | |
1317 | return -EFAULT; | |
f0ad0860 PM |
1318 | |
1319 | rtnl_lock(); | |
1320 | ret = 0; | |
4c968709 ED |
1321 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1322 | ret = -EBUSY; | |
1323 | } else { | |
1324 | if (!ipmr_new_table(net, v)) | |
1325 | ret = -ENOMEM; | |
1326 | raw_sk(sk)->ipmr_table = v; | |
1327 | } | |
f0ad0860 PM |
1328 | rtnl_unlock(); |
1329 | return ret; | |
1330 | } | |
1da177e4 | 1331 | #endif |
132adf54 SH |
1332 | /* |
1333 | * Spurious command, or MRT_VERSION which you cannot | |
1334 | * set. | |
1335 | */ | |
1336 | default: | |
1337 | return -ENOPROTOOPT; | |
1da177e4 LT |
1338 | } |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Getsock opt support for the multicast routing system. | |
1343 | */ | |
e905a9ed | 1344 | |
c354e124 | 1345 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1346 | { |
1347 | int olr; | |
1348 | int val; | |
4feb88e5 | 1349 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1350 | struct mr_table *mrt; |
1351 | ||
1352 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1353 | if (mrt == NULL) | |
1354 | return -ENOENT; | |
1da177e4 | 1355 | |
c354e124 | 1356 | if (optname != MRT_VERSION && |
1da177e4 LT |
1357 | #ifdef CONFIG_IP_PIMSM |
1358 | optname!=MRT_PIM && | |
1359 | #endif | |
1360 | optname!=MRT_ASSERT) | |
1361 | return -ENOPROTOOPT; | |
1362 | ||
1363 | if (get_user(olr, optlen)) | |
1364 | return -EFAULT; | |
1365 | ||
1366 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1367 | if (olr < 0) | |
1368 | return -EINVAL; | |
e905a9ed | 1369 | |
c354e124 | 1370 | if (put_user(olr, optlen)) |
1da177e4 | 1371 | return -EFAULT; |
c354e124 JK |
1372 | if (optname == MRT_VERSION) |
1373 | val = 0x0305; | |
1da177e4 | 1374 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1375 | else if (optname == MRT_PIM) |
0c12295a | 1376 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1377 | #endif |
1378 | else | |
0c12295a | 1379 | val = mrt->mroute_do_assert; |
c354e124 | 1380 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1381 | return -EFAULT; |
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * The IP multicast ioctl support routines. | |
1387 | */ | |
e905a9ed | 1388 | |
1da177e4 LT |
1389 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1390 | { | |
1391 | struct sioc_sg_req sr; | |
1392 | struct sioc_vif_req vr; | |
1393 | struct vif_device *vif; | |
1394 | struct mfc_cache *c; | |
4feb88e5 | 1395 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1396 | struct mr_table *mrt; |
1397 | ||
1398 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1399 | if (mrt == NULL) | |
1400 | return -ENOENT; | |
e905a9ed | 1401 | |
132adf54 SH |
1402 | switch (cmd) { |
1403 | case SIOCGETVIFCNT: | |
c354e124 | 1404 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1405 | return -EFAULT; |
0c12295a | 1406 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1407 | return -EINVAL; |
1408 | read_lock(&mrt_lock); | |
0c12295a PM |
1409 | vif = &mrt->vif_table[vr.vifi]; |
1410 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1411 | vr.icount = vif->pkt_in; |
1412 | vr.ocount = vif->pkt_out; | |
1413 | vr.ibytes = vif->bytes_in; | |
1414 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1415 | read_unlock(&mrt_lock); |
1da177e4 | 1416 | |
c354e124 | 1417 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1418 | return -EFAULT; |
1419 | return 0; | |
1420 | } | |
1421 | read_unlock(&mrt_lock); | |
1422 | return -EADDRNOTAVAIL; | |
1423 | case SIOCGETSGCNT: | |
c354e124 | 1424 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1425 | return -EFAULT; |
1426 | ||
a8c9486b | 1427 | rcu_read_lock(); |
0c12295a | 1428 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1429 | if (c) { |
1430 | sr.pktcnt = c->mfc_un.res.pkt; | |
1431 | sr.bytecnt = c->mfc_un.res.bytes; | |
1432 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1433 | rcu_read_unlock(); |
132adf54 | 1434 | |
c354e124 | 1435 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1436 | return -EFAULT; |
1437 | return 0; | |
1438 | } | |
a8c9486b | 1439 | rcu_read_unlock(); |
132adf54 SH |
1440 | return -EADDRNOTAVAIL; |
1441 | default: | |
1442 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1443 | } |
1444 | } | |
1445 | ||
1446 | ||
1447 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1448 | { | |
e9dc8653 | 1449 | struct net_device *dev = ptr; |
4feb88e5 | 1450 | struct net *net = dev_net(dev); |
f0ad0860 | 1451 | struct mr_table *mrt; |
1da177e4 LT |
1452 | struct vif_device *v; |
1453 | int ct; | |
d17fa6fa | 1454 | LIST_HEAD(list); |
e9dc8653 | 1455 | |
1da177e4 LT |
1456 | if (event != NETDEV_UNREGISTER) |
1457 | return NOTIFY_DONE; | |
f0ad0860 PM |
1458 | |
1459 | ipmr_for_each_table(mrt, net) { | |
1460 | v = &mrt->vif_table[0]; | |
1461 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1462 | if (v->dev == dev) | |
1463 | vif_delete(mrt, ct, 1, &list); | |
1464 | } | |
1da177e4 | 1465 | } |
d17fa6fa | 1466 | unregister_netdevice_many(&list); |
1da177e4 LT |
1467 | return NOTIFY_DONE; |
1468 | } | |
1469 | ||
1470 | ||
c354e124 | 1471 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1472 | .notifier_call = ipmr_device_event, |
1473 | }; | |
1474 | ||
1475 | /* | |
1476 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1477 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1478 | * important for multicast video. | |
1479 | */ | |
e905a9ed | 1480 | |
114c7844 | 1481 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1482 | { |
8856dfa3 | 1483 | struct iphdr *iph; |
eddc9ec5 | 1484 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1485 | |
1486 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1487 | skb->transport_header = skb->network_header; |
8856dfa3 | 1488 | skb_reset_network_header(skb); |
eddc9ec5 | 1489 | iph = ip_hdr(skb); |
1da177e4 LT |
1490 | |
1491 | iph->version = 4; | |
e023dd64 ACM |
1492 | iph->tos = old_iph->tos; |
1493 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1494 | iph->frag_off = 0; |
1495 | iph->daddr = daddr; | |
1496 | iph->saddr = saddr; | |
1497 | iph->protocol = IPPROTO_IPIP; | |
1498 | iph->ihl = 5; | |
1499 | iph->tot_len = htons(skb->len); | |
adf30907 | 1500 | ip_select_ident(iph, skb_dst(skb), NULL); |
1da177e4 LT |
1501 | ip_send_check(iph); |
1502 | ||
1da177e4 LT |
1503 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1504 | nf_reset(skb); | |
1505 | } | |
1506 | ||
1507 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1508 | { | |
1509 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1510 | ||
adf30907 | 1511 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1512 | |
1513 | if (unlikely(opt->optlen)) | |
1514 | ip_forward_options(skb); | |
1515 | ||
1516 | return dst_output(skb); | |
1517 | } | |
1518 | ||
1519 | /* | |
1520 | * Processing handlers for ipmr_forward | |
1521 | */ | |
1522 | ||
0c12295a PM |
1523 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1524 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1525 | { |
eddc9ec5 | 1526 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1527 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1528 | struct net_device *dev; |
1529 | struct rtable *rt; | |
1530 | int encap = 0; | |
1531 | ||
1532 | if (vif->dev == NULL) | |
1533 | goto out_free; | |
1534 | ||
1535 | #ifdef CONFIG_IP_PIMSM | |
1536 | if (vif->flags & VIFF_REGISTER) { | |
1537 | vif->pkt_out++; | |
c354e124 | 1538 | vif->bytes_out += skb->len; |
cf3677ae PE |
1539 | vif->dev->stats.tx_bytes += skb->len; |
1540 | vif->dev->stats.tx_packets++; | |
0c12295a | 1541 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1542 | goto out_free; |
1da177e4 LT |
1543 | } |
1544 | #endif | |
1545 | ||
1546 | if (vif->flags&VIFF_TUNNEL) { | |
1547 | struct flowi fl = { .oif = vif->link, | |
1548 | .nl_u = { .ip4_u = | |
1549 | { .daddr = vif->remote, | |
1550 | .saddr = vif->local, | |
1551 | .tos = RT_TOS(iph->tos) } }, | |
1552 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1553 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1554 | goto out_free; |
1555 | encap = sizeof(struct iphdr); | |
1556 | } else { | |
1557 | struct flowi fl = { .oif = vif->link, | |
1558 | .nl_u = { .ip4_u = | |
1559 | { .daddr = iph->daddr, | |
1560 | .tos = RT_TOS(iph->tos) } }, | |
1561 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1562 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1563 | goto out_free; |
1564 | } | |
1565 | ||
d8d1f30b | 1566 | dev = rt->dst.dev; |
1da177e4 | 1567 | |
d8d1f30b | 1568 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 LT |
1569 | /* Do not fragment multicasts. Alas, IPv4 does not |
1570 | allow to send ICMP, so that packets will disappear | |
1571 | to blackhole. | |
1572 | */ | |
1573 | ||
7c73a6fa | 1574 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1575 | ip_rt_put(rt); |
1576 | goto out_free; | |
1577 | } | |
1578 | ||
d8d1f30b | 1579 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1580 | |
1581 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1582 | ip_rt_put(rt); |
1da177e4 LT |
1583 | goto out_free; |
1584 | } | |
1585 | ||
1586 | vif->pkt_out++; | |
c354e124 | 1587 | vif->bytes_out += skb->len; |
1da177e4 | 1588 | |
adf30907 | 1589 | skb_dst_drop(skb); |
d8d1f30b | 1590 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1591 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1592 | |
1593 | /* FIXME: forward and output firewalls used to be called here. | |
1594 | * What do we do with netfilter? -- RR */ | |
1595 | if (vif->flags & VIFF_TUNNEL) { | |
1596 | ip_encap(skb, vif->local, vif->remote); | |
1597 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1598 | vif->dev->stats.tx_packets++; |
1599 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1600 | } |
1601 | ||
1602 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1603 | ||
1604 | /* | |
1605 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1606 | * not only before forwarding, but after forwarding on all output | |
1607 | * interfaces. It is clear, if mrouter runs a multicasting | |
1608 | * program, it should receive packets not depending to what interface | |
1609 | * program is joined. | |
1610 | * If we will not make it, the program will have to join on all | |
1611 | * interfaces. On the other hand, multihoming host (or router, but | |
1612 | * not mrouter) cannot join to more than one interface - it will | |
1613 | * result in receiving multiple packets. | |
1614 | */ | |
9bbc768a | 1615 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1616 | ipmr_forward_finish); |
1617 | return; | |
1618 | ||
1619 | out_free: | |
1620 | kfree_skb(skb); | |
1da177e4 LT |
1621 | } |
1622 | ||
0c12295a | 1623 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1624 | { |
1625 | int ct; | |
0c12295a PM |
1626 | |
1627 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1628 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1629 | break; |
1630 | } | |
1631 | return ct; | |
1632 | } | |
1633 | ||
1634 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1635 | ||
0c12295a PM |
1636 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
1637 | struct sk_buff *skb, struct mfc_cache *cache, | |
1638 | int local) | |
1da177e4 LT |
1639 | { |
1640 | int psend = -1; | |
1641 | int vif, ct; | |
1642 | ||
1643 | vif = cache->mfc_parent; | |
1644 | cache->mfc_un.res.pkt++; | |
1645 | cache->mfc_un.res.bytes += skb->len; | |
1646 | ||
1647 | /* | |
1648 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1649 | */ | |
0c12295a | 1650 | if (mrt->vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1651 | int true_vifi; |
1652 | ||
511c3f92 | 1653 | if (skb_rtable(skb)->fl.iif == 0) { |
1da177e4 LT |
1654 | /* It is our own packet, looped back. |
1655 | Very complicated situation... | |
1656 | ||
1657 | The best workaround until routing daemons will be | |
1658 | fixed is not to redistribute packet, if it was | |
1659 | send through wrong interface. It means, that | |
1660 | multicast applications WILL NOT work for | |
1661 | (S,G), which have default multicast route pointing | |
1662 | to wrong oif. In any case, it is not a good | |
1663 | idea to use multicasting applications on router. | |
1664 | */ | |
1665 | goto dont_forward; | |
1666 | } | |
1667 | ||
1668 | cache->mfc_un.res.wrong_if++; | |
0c12295a | 1669 | true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1670 | |
0c12295a | 1671 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 LT |
1672 | /* pimsm uses asserts, when switching from RPT to SPT, |
1673 | so that we cannot check that packet arrived on an oif. | |
1674 | It is bad, but otherwise we would need to move pretty | |
1675 | large chunk of pimd to kernel. Ough... --ANK | |
1676 | */ | |
0c12295a | 1677 | (mrt->mroute_do_pim || |
6f9374a9 | 1678 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1679 | time_after(jiffies, |
1da177e4 LT |
1680 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1681 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1682 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1683 | } |
1684 | goto dont_forward; | |
1685 | } | |
1686 | ||
0c12295a PM |
1687 | mrt->vif_table[vif].pkt_in++; |
1688 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1689 | |
1690 | /* | |
1691 | * Forward the frame | |
1692 | */ | |
1693 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1694 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1695 | if (psend != -1) { |
1696 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1697 | if (skb2) | |
0c12295a PM |
1698 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1699 | psend); | |
1da177e4 | 1700 | } |
c354e124 | 1701 | psend = ct; |
1da177e4 LT |
1702 | } |
1703 | } | |
1704 | if (psend != -1) { | |
1705 | if (local) { | |
1706 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1707 | if (skb2) | |
0c12295a | 1708 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1709 | } else { |
0c12295a | 1710 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
1da177e4 LT |
1711 | return 0; |
1712 | } | |
1713 | } | |
1714 | ||
1715 | dont_forward: | |
1716 | if (!local) | |
1717 | kfree_skb(skb); | |
1718 | return 0; | |
1719 | } | |
1720 | ||
1721 | ||
1722 | /* | |
1723 | * Multicast packets for forwarding arrive here | |
4c968709 | 1724 | * Called with rcu_read_lock(); |
1da177e4 LT |
1725 | */ |
1726 | ||
1727 | int ip_mr_input(struct sk_buff *skb) | |
1728 | { | |
1729 | struct mfc_cache *cache; | |
4feb88e5 | 1730 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1731 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 PM |
1732 | struct mr_table *mrt; |
1733 | int err; | |
1da177e4 LT |
1734 | |
1735 | /* Packet is looped back after forward, it should not be | |
1736 | forwarded second time, but still can be delivered locally. | |
1737 | */ | |
4c968709 | 1738 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
1739 | goto dont_forward; |
1740 | ||
f0ad0860 | 1741 | err = ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt); |
e40dbc51 BG |
1742 | if (err < 0) { |
1743 | kfree_skb(skb); | |
f0ad0860 | 1744 | return err; |
e40dbc51 | 1745 | } |
f0ad0860 | 1746 | |
1da177e4 | 1747 | if (!local) { |
4c968709 ED |
1748 | if (IPCB(skb)->opt.router_alert) { |
1749 | if (ip_call_ra_chain(skb)) | |
1750 | return 0; | |
1751 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1752 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1753 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1754 | * option to IGMP packets destined to routable | |
1755 | * groups. It is very bad, because it means | |
1756 | * that we can forward NO IGMP messages. | |
1757 | */ | |
1758 | struct sock *mroute_sk; | |
1759 | ||
1760 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1761 | if (mroute_sk) { | |
1762 | nf_reset(skb); | |
1763 | raw_rcv(mroute_sk, skb); | |
1764 | return 0; | |
1765 | } | |
1da177e4 LT |
1766 | } |
1767 | } | |
1768 | ||
a8c9486b | 1769 | /* already under rcu_read_lock() */ |
0c12295a | 1770 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1771 | |
1772 | /* | |
1773 | * No usable cache entry | |
1774 | */ | |
c354e124 | 1775 | if (cache == NULL) { |
1da177e4 LT |
1776 | int vif; |
1777 | ||
1778 | if (local) { | |
1779 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1780 | ip_local_deliver(skb); | |
a8c9486b | 1781 | if (skb2 == NULL) |
1da177e4 | 1782 | return -ENOBUFS; |
1da177e4 LT |
1783 | skb = skb2; |
1784 | } | |
1785 | ||
a8c9486b | 1786 | read_lock(&mrt_lock); |
0c12295a | 1787 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1788 | if (vif >= 0) { |
0eae88f3 | 1789 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
1790 | read_unlock(&mrt_lock); |
1791 | ||
0eae88f3 | 1792 | return err2; |
1da177e4 LT |
1793 | } |
1794 | read_unlock(&mrt_lock); | |
1795 | kfree_skb(skb); | |
1796 | return -ENODEV; | |
1797 | } | |
1798 | ||
a8c9486b | 1799 | read_lock(&mrt_lock); |
0c12295a | 1800 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
1801 | read_unlock(&mrt_lock); |
1802 | ||
1803 | if (local) | |
1804 | return ip_local_deliver(skb); | |
1805 | ||
1806 | return 0; | |
1807 | ||
1808 | dont_forward: | |
1809 | if (local) | |
1810 | return ip_local_deliver(skb); | |
1811 | kfree_skb(skb); | |
1812 | return 0; | |
1813 | } | |
1814 | ||
b1879204 | 1815 | #ifdef CONFIG_IP_PIMSM |
55747a0a | 1816 | /* called with rcu_read_lock() */ |
f0ad0860 PM |
1817 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
1818 | unsigned int pimlen) | |
1da177e4 | 1819 | { |
b1879204 IJ |
1820 | struct net_device *reg_dev = NULL; |
1821 | struct iphdr *encap; | |
1da177e4 | 1822 | |
b1879204 | 1823 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1824 | /* |
1825 | Check that: | |
1826 | a. packet is really destinted to a multicast group | |
1827 | b. packet is not a NULL-REGISTER | |
1828 | c. packet is not truncated | |
1829 | */ | |
f97c1e0c | 1830 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1831 | encap->tot_len == 0 || |
b1879204 IJ |
1832 | ntohs(encap->tot_len) + pimlen > skb->len) |
1833 | return 1; | |
1da177e4 LT |
1834 | |
1835 | read_lock(&mrt_lock); | |
0c12295a PM |
1836 | if (mrt->mroute_reg_vif_num >= 0) |
1837 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
1838 | read_unlock(&mrt_lock); |
1839 | ||
e905a9ed | 1840 | if (reg_dev == NULL) |
b1879204 | 1841 | return 1; |
1da177e4 | 1842 | |
b0e380b1 | 1843 | skb->mac_header = skb->network_header; |
55747a0a | 1844 | skb_pull(skb, (u8 *)encap - skb->data); |
31c7711b | 1845 | skb_reset_network_header(skb); |
1da177e4 | 1846 | skb->protocol = htons(ETH_P_IP); |
55747a0a | 1847 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 1848 | skb->pkt_type = PACKET_HOST; |
d19d56dd ED |
1849 | |
1850 | skb_tunnel_rx(skb, reg_dev); | |
1851 | ||
1da177e4 | 1852 | netif_rx(skb); |
b1879204 | 1853 | |
55747a0a | 1854 | return NET_RX_SUCCESS; |
b1879204 IJ |
1855 | } |
1856 | #endif | |
1857 | ||
1858 | #ifdef CONFIG_IP_PIMSM_V1 | |
1859 | /* | |
1860 | * Handle IGMP messages of PIMv1 | |
1861 | */ | |
1862 | ||
1863 | int pim_rcv_v1(struct sk_buff * skb) | |
1864 | { | |
1865 | struct igmphdr *pim; | |
4feb88e5 | 1866 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 1867 | struct mr_table *mrt; |
b1879204 IJ |
1868 | |
1869 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1870 | goto drop; | |
1871 | ||
1872 | pim = igmp_hdr(skb); | |
1873 | ||
f0ad0860 PM |
1874 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1875 | goto drop; | |
1876 | ||
0c12295a | 1877 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
1878 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1879 | goto drop; | |
1880 | ||
f0ad0860 | 1881 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
1882 | drop: |
1883 | kfree_skb(skb); | |
1884 | } | |
1da177e4 LT |
1885 | return 0; |
1886 | } | |
1887 | #endif | |
1888 | ||
1889 | #ifdef CONFIG_IP_PIMSM_V2 | |
1890 | static int pim_rcv(struct sk_buff * skb) | |
1891 | { | |
1892 | struct pimreghdr *pim; | |
f0ad0860 PM |
1893 | struct net *net = dev_net(skb->dev); |
1894 | struct mr_table *mrt; | |
1da177e4 | 1895 | |
b1879204 | 1896 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1897 | goto drop; |
1898 | ||
9c70220b | 1899 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1900 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1901 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1902 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1903 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1904 | goto drop; |
1905 | ||
f0ad0860 PM |
1906 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1907 | goto drop; | |
1908 | ||
1909 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { | |
b1879204 IJ |
1910 | drop: |
1911 | kfree_skb(skb); | |
1912 | } | |
1da177e4 LT |
1913 | return 0; |
1914 | } | |
1915 | #endif | |
1916 | ||
cb6a4e46 PM |
1917 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
1918 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 LT |
1919 | { |
1920 | int ct; | |
1921 | struct rtnexthop *nhp; | |
27a884dc | 1922 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1923 | struct rtattr *mp_head; |
1924 | ||
7438189b | 1925 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 1926 | if (c->mfc_parent >= MAXVIFS) |
7438189b ND |
1927 | return -ENOENT; |
1928 | ||
0c12295a PM |
1929 | if (VIF_EXISTS(mrt, c->mfc_parent)) |
1930 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex); | |
1da177e4 | 1931 | |
c354e124 | 1932 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1933 | |
1934 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 1935 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
1da177e4 LT |
1936 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1937 | goto rtattr_failure; | |
c354e124 | 1938 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1939 | nhp->rtnh_flags = 0; |
1940 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 1941 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
1942 | nhp->rtnh_len = sizeof(*nhp); |
1943 | } | |
1944 | } | |
1945 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1946 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1947 | rtm->rtm_type = RTN_MULTICAST; |
1948 | return 1; | |
1949 | ||
1950 | rtattr_failure: | |
dc5fc579 | 1951 | nlmsg_trim(skb, b); |
1da177e4 LT |
1952 | return -EMSGSIZE; |
1953 | } | |
1954 | ||
4feb88e5 BT |
1955 | int ipmr_get_route(struct net *net, |
1956 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1da177e4 LT |
1957 | { |
1958 | int err; | |
f0ad0860 | 1959 | struct mr_table *mrt; |
1da177e4 | 1960 | struct mfc_cache *cache; |
511c3f92 | 1961 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 1962 | |
f0ad0860 PM |
1963 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
1964 | if (mrt == NULL) | |
1965 | return -ENOENT; | |
1966 | ||
a8c9486b | 1967 | rcu_read_lock(); |
0c12295a | 1968 | cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst); |
1da177e4 | 1969 | |
c354e124 | 1970 | if (cache == NULL) { |
72287490 | 1971 | struct sk_buff *skb2; |
eddc9ec5 | 1972 | struct iphdr *iph; |
1da177e4 LT |
1973 | struct net_device *dev; |
1974 | int vif; | |
1975 | ||
1976 | if (nowait) { | |
a8c9486b | 1977 | rcu_read_unlock(); |
1da177e4 LT |
1978 | return -EAGAIN; |
1979 | } | |
1980 | ||
1981 | dev = skb->dev; | |
a8c9486b | 1982 | read_lock(&mrt_lock); |
0c12295a | 1983 | if (dev == NULL || (vif = ipmr_find_vif(mrt, dev)) < 0) { |
1da177e4 | 1984 | read_unlock(&mrt_lock); |
a8c9486b | 1985 | rcu_read_unlock(); |
1da177e4 LT |
1986 | return -ENODEV; |
1987 | } | |
72287490 AK |
1988 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1989 | if (!skb2) { | |
1990 | read_unlock(&mrt_lock); | |
a8c9486b | 1991 | rcu_read_unlock(); |
72287490 AK |
1992 | return -ENOMEM; |
1993 | } | |
1994 | ||
e2d1bca7 ACM |
1995 | skb_push(skb2, sizeof(struct iphdr)); |
1996 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1997 | iph = ip_hdr(skb2); |
1998 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1999 | iph->saddr = rt->rt_src; | |
2000 | iph->daddr = rt->rt_dst; | |
2001 | iph->version = 0; | |
0c12295a | 2002 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 | 2003 | read_unlock(&mrt_lock); |
a8c9486b | 2004 | rcu_read_unlock(); |
1da177e4 LT |
2005 | return err; |
2006 | } | |
2007 | ||
a8c9486b ED |
2008 | read_lock(&mrt_lock); |
2009 | if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) | |
1da177e4 | 2010 | cache->mfc_flags |= MFC_NOTIFY; |
cb6a4e46 | 2011 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2012 | read_unlock(&mrt_lock); |
a8c9486b | 2013 | rcu_read_unlock(); |
1da177e4 LT |
2014 | return err; |
2015 | } | |
2016 | ||
cb6a4e46 PM |
2017 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2018 | u32 pid, u32 seq, struct mfc_cache *c) | |
2019 | { | |
2020 | struct nlmsghdr *nlh; | |
2021 | struct rtmsg *rtm; | |
2022 | ||
2023 | nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); | |
2024 | if (nlh == NULL) | |
2025 | return -EMSGSIZE; | |
2026 | ||
2027 | rtm = nlmsg_data(nlh); | |
2028 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2029 | rtm->rtm_dst_len = 32; | |
2030 | rtm->rtm_src_len = 32; | |
2031 | rtm->rtm_tos = 0; | |
2032 | rtm->rtm_table = mrt->id; | |
2033 | NLA_PUT_U32(skb, RTA_TABLE, mrt->id); | |
2034 | rtm->rtm_type = RTN_MULTICAST; | |
2035 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2036 | rtm->rtm_protocol = RTPROT_UNSPEC; | |
2037 | rtm->rtm_flags = 0; | |
2038 | ||
2039 | NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin); | |
2040 | NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp); | |
2041 | ||
2042 | if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0) | |
2043 | goto nla_put_failure; | |
2044 | ||
2045 | return nlmsg_end(skb, nlh); | |
2046 | ||
2047 | nla_put_failure: | |
2048 | nlmsg_cancel(skb, nlh); | |
2049 | return -EMSGSIZE; | |
2050 | } | |
2051 | ||
2052 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) | |
2053 | { | |
2054 | struct net *net = sock_net(skb->sk); | |
2055 | struct mr_table *mrt; | |
2056 | struct mfc_cache *mfc; | |
2057 | unsigned int t = 0, s_t; | |
2058 | unsigned int h = 0, s_h; | |
2059 | unsigned int e = 0, s_e; | |
2060 | ||
2061 | s_t = cb->args[0]; | |
2062 | s_h = cb->args[1]; | |
2063 | s_e = cb->args[2]; | |
2064 | ||
a8c9486b | 2065 | rcu_read_lock(); |
cb6a4e46 PM |
2066 | ipmr_for_each_table(mrt, net) { |
2067 | if (t < s_t) | |
2068 | goto next_table; | |
2069 | if (t > s_t) | |
2070 | s_h = 0; | |
2071 | for (h = s_h; h < MFC_LINES; h++) { | |
a8c9486b | 2072 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { |
cb6a4e46 PM |
2073 | if (e < s_e) |
2074 | goto next_entry; | |
2075 | if (ipmr_fill_mroute(mrt, skb, | |
2076 | NETLINK_CB(cb->skb).pid, | |
2077 | cb->nlh->nlmsg_seq, | |
2078 | mfc) < 0) | |
2079 | goto done; | |
2080 | next_entry: | |
2081 | e++; | |
2082 | } | |
2083 | e = s_e = 0; | |
2084 | } | |
2085 | s_h = 0; | |
2086 | next_table: | |
2087 | t++; | |
2088 | } | |
2089 | done: | |
a8c9486b | 2090 | rcu_read_unlock(); |
cb6a4e46 PM |
2091 | |
2092 | cb->args[2] = e; | |
2093 | cb->args[1] = h; | |
2094 | cb->args[0] = t; | |
2095 | ||
2096 | return skb->len; | |
2097 | } | |
2098 | ||
e905a9ed | 2099 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
2100 | /* |
2101 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
2102 | */ | |
2103 | struct ipmr_vif_iter { | |
f6bb4514 | 2104 | struct seq_net_private p; |
f0ad0860 | 2105 | struct mr_table *mrt; |
1da177e4 LT |
2106 | int ct; |
2107 | }; | |
2108 | ||
f6bb4514 BT |
2109 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2110 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2111 | loff_t pos) |
2112 | { | |
f0ad0860 | 2113 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2114 | |
2115 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2116 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2117 | continue; |
e905a9ed | 2118 | if (pos-- == 0) |
0c12295a | 2119 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2120 | } |
2121 | return NULL; | |
2122 | } | |
2123 | ||
2124 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2125 | __acquires(mrt_lock) |
1da177e4 | 2126 | { |
f0ad0860 | 2127 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2128 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2129 | struct mr_table *mrt; |
2130 | ||
2131 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2132 | if (mrt == NULL) | |
2133 | return ERR_PTR(-ENOENT); | |
2134 | ||
2135 | iter->mrt = mrt; | |
f6bb4514 | 2136 | |
1da177e4 | 2137 | read_lock(&mrt_lock); |
f6bb4514 | 2138 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2139 | : SEQ_START_TOKEN; |
2140 | } | |
2141 | ||
2142 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2143 | { | |
2144 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2145 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2146 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2147 | |
2148 | ++*pos; | |
2149 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2150 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2151 | |
0c12295a PM |
2152 | while (++iter->ct < mrt->maxvif) { |
2153 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2154 | continue; |
0c12295a | 2155 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2156 | } |
2157 | return NULL; | |
2158 | } | |
2159 | ||
2160 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2161 | __releases(mrt_lock) |
1da177e4 LT |
2162 | { |
2163 | read_unlock(&mrt_lock); | |
2164 | } | |
2165 | ||
2166 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2167 | { | |
f0ad0860 PM |
2168 | struct ipmr_vif_iter *iter = seq->private; |
2169 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2170 | |
1da177e4 | 2171 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2172 | seq_puts(seq, |
1da177e4 LT |
2173 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2174 | } else { | |
2175 | const struct vif_device *vif = v; | |
2176 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2177 | ||
2178 | seq_printf(seq, | |
2179 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2180 | vif - mrt->vif_table, |
e905a9ed | 2181 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2182 | vif->bytes_out, vif->pkt_out, |
2183 | vif->flags, vif->local, vif->remote); | |
2184 | } | |
2185 | return 0; | |
2186 | } | |
2187 | ||
f690808e | 2188 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2189 | .start = ipmr_vif_seq_start, |
2190 | .next = ipmr_vif_seq_next, | |
2191 | .stop = ipmr_vif_seq_stop, | |
2192 | .show = ipmr_vif_seq_show, | |
2193 | }; | |
2194 | ||
2195 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2196 | { | |
f6bb4514 BT |
2197 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2198 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2199 | } |
2200 | ||
9a32144e | 2201 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2202 | .owner = THIS_MODULE, |
2203 | .open = ipmr_vif_open, | |
2204 | .read = seq_read, | |
2205 | .llseek = seq_lseek, | |
f6bb4514 | 2206 | .release = seq_release_net, |
1da177e4 LT |
2207 | }; |
2208 | ||
2209 | struct ipmr_mfc_iter { | |
f6bb4514 | 2210 | struct seq_net_private p; |
f0ad0860 | 2211 | struct mr_table *mrt; |
862465f2 | 2212 | struct list_head *cache; |
1da177e4 LT |
2213 | int ct; |
2214 | }; | |
2215 | ||
2216 | ||
f6bb4514 BT |
2217 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2218 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2219 | { |
f0ad0860 | 2220 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2221 | struct mfc_cache *mfc; |
2222 | ||
a8c9486b | 2223 | rcu_read_lock(); |
862465f2 | 2224 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2225 | it->cache = &mrt->mfc_cache_array[it->ct]; |
a8c9486b | 2226 | list_for_each_entry_rcu(mfc, it->cache, list) |
e905a9ed | 2227 | if (pos-- == 0) |
1da177e4 | 2228 | return mfc; |
862465f2 | 2229 | } |
a8c9486b | 2230 | rcu_read_unlock(); |
1da177e4 | 2231 | |
1da177e4 | 2232 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2233 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2234 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2235 | if (pos-- == 0) |
1da177e4 LT |
2236 | return mfc; |
2237 | spin_unlock_bh(&mfc_unres_lock); | |
2238 | ||
2239 | it->cache = NULL; | |
2240 | return NULL; | |
2241 | } | |
2242 | ||
2243 | ||
2244 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2245 | { | |
2246 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2247 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2248 | struct mr_table *mrt; |
f6bb4514 | 2249 | |
f0ad0860 PM |
2250 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
2251 | if (mrt == NULL) | |
2252 | return ERR_PTR(-ENOENT); | |
f6bb4514 | 2253 | |
f0ad0860 | 2254 | it->mrt = mrt; |
1da177e4 LT |
2255 | it->cache = NULL; |
2256 | it->ct = 0; | |
f6bb4514 | 2257 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2258 | : SEQ_START_TOKEN; |
2259 | } | |
2260 | ||
2261 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2262 | { | |
2263 | struct mfc_cache *mfc = v; | |
2264 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2265 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2266 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2267 | |
2268 | ++*pos; | |
2269 | ||
2270 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2271 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2272 | |
862465f2 PM |
2273 | if (mfc->list.next != it->cache) |
2274 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2275 | |
0c12295a | 2276 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2277 | goto end_of_list; |
2278 | ||
0c12295a | 2279 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2280 | |
2281 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2282 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2283 | if (list_empty(it->cache)) |
2284 | continue; | |
2285 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2286 | } |
2287 | ||
2288 | /* exhausted cache_array, show unresolved */ | |
a8c9486b | 2289 | rcu_read_unlock(); |
0c12295a | 2290 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2291 | it->ct = 0; |
e905a9ed | 2292 | |
1da177e4 | 2293 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2294 | if (!list_empty(it->cache)) |
2295 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2296 | |
2297 | end_of_list: | |
2298 | spin_unlock_bh(&mfc_unres_lock); | |
2299 | it->cache = NULL; | |
2300 | ||
2301 | return NULL; | |
2302 | } | |
2303 | ||
2304 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2305 | { | |
2306 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2307 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2308 | |
0c12295a | 2309 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2310 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2311 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
a8c9486b | 2312 | rcu_read_unlock(); |
1da177e4 LT |
2313 | } |
2314 | ||
2315 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2316 | { | |
2317 | int n; | |
2318 | ||
2319 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2320 | seq_puts(seq, |
1da177e4 LT |
2321 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2322 | } else { | |
2323 | const struct mfc_cache *mfc = v; | |
2324 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2325 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2326 | |
0eae88f3 ED |
2327 | seq_printf(seq, "%08X %08X %-3hd", |
2328 | (__force u32) mfc->mfc_mcastgrp, | |
2329 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2330 | mfc->mfc_parent); |
1da177e4 | 2331 | |
0c12295a | 2332 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2333 | seq_printf(seq, " %8lu %8lu %8lu", |
2334 | mfc->mfc_un.res.pkt, | |
2335 | mfc->mfc_un.res.bytes, | |
2336 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
2337 | for (n = mfc->mfc_un.res.minvif; |
2338 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
0c12295a | 2339 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2340 | mfc->mfc_un.res.ttls[n] < 255) |
2341 | seq_printf(seq, | |
e905a9ed | 2342 | " %2d:%-3d", |
1da177e4 LT |
2343 | n, mfc->mfc_un.res.ttls[n]); |
2344 | } | |
1ea472e2 BT |
2345 | } else { |
2346 | /* unresolved mfc_caches don't contain | |
2347 | * pkt, bytes and wrong_if values | |
2348 | */ | |
2349 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2350 | } |
2351 | seq_putc(seq, '\n'); | |
2352 | } | |
2353 | return 0; | |
2354 | } | |
2355 | ||
f690808e | 2356 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2357 | .start = ipmr_mfc_seq_start, |
2358 | .next = ipmr_mfc_seq_next, | |
2359 | .stop = ipmr_mfc_seq_stop, | |
2360 | .show = ipmr_mfc_seq_show, | |
2361 | }; | |
2362 | ||
2363 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2364 | { | |
f6bb4514 BT |
2365 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2366 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2367 | } |
2368 | ||
9a32144e | 2369 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2370 | .owner = THIS_MODULE, |
2371 | .open = ipmr_mfc_open, | |
2372 | .read = seq_read, | |
2373 | .llseek = seq_lseek, | |
f6bb4514 | 2374 | .release = seq_release_net, |
1da177e4 | 2375 | }; |
e905a9ed | 2376 | #endif |
1da177e4 LT |
2377 | |
2378 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2379 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2380 | .handler = pim_rcv, |
403dbb97 | 2381 | .netns_ok = 1, |
1da177e4 LT |
2382 | }; |
2383 | #endif | |
2384 | ||
2385 | ||
2386 | /* | |
2387 | * Setup for IP multicast routing | |
2388 | */ | |
cf958ae3 BT |
2389 | static int __net_init ipmr_net_init(struct net *net) |
2390 | { | |
f0ad0860 | 2391 | int err; |
cf958ae3 | 2392 | |
f0ad0860 PM |
2393 | err = ipmr_rules_init(net); |
2394 | if (err < 0) | |
cf958ae3 | 2395 | goto fail; |
f6bb4514 BT |
2396 | |
2397 | #ifdef CONFIG_PROC_FS | |
2398 | err = -ENOMEM; | |
2399 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
2400 | goto proc_vif_fail; | |
2401 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
2402 | goto proc_cache_fail; | |
2403 | #endif | |
2bb8b26c BT |
2404 | return 0; |
2405 | ||
f6bb4514 BT |
2406 | #ifdef CONFIG_PROC_FS |
2407 | proc_cache_fail: | |
2408 | proc_net_remove(net, "ip_mr_vif"); | |
2409 | proc_vif_fail: | |
f0ad0860 | 2410 | ipmr_rules_exit(net); |
f6bb4514 | 2411 | #endif |
cf958ae3 BT |
2412 | fail: |
2413 | return err; | |
2414 | } | |
2415 | ||
2416 | static void __net_exit ipmr_net_exit(struct net *net) | |
2417 | { | |
f6bb4514 BT |
2418 | #ifdef CONFIG_PROC_FS |
2419 | proc_net_remove(net, "ip_mr_cache"); | |
2420 | proc_net_remove(net, "ip_mr_vif"); | |
2421 | #endif | |
f0ad0860 | 2422 | ipmr_rules_exit(net); |
cf958ae3 BT |
2423 | } |
2424 | ||
2425 | static struct pernet_operations ipmr_net_ops = { | |
2426 | .init = ipmr_net_init, | |
2427 | .exit = ipmr_net_exit, | |
2428 | }; | |
e905a9ed | 2429 | |
03d2f897 | 2430 | int __init ip_mr_init(void) |
1da177e4 | 2431 | { |
03d2f897 WC |
2432 | int err; |
2433 | ||
1da177e4 LT |
2434 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2435 | sizeof(struct mfc_cache), | |
a8c9486b | 2436 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 2437 | NULL); |
03d2f897 WC |
2438 | if (!mrt_cachep) |
2439 | return -ENOMEM; | |
2440 | ||
cf958ae3 BT |
2441 | err = register_pernet_subsys(&ipmr_net_ops); |
2442 | if (err) | |
2443 | goto reg_pernet_fail; | |
2444 | ||
03d2f897 WC |
2445 | err = register_netdevice_notifier(&ip_mr_notifier); |
2446 | if (err) | |
2447 | goto reg_notif_fail; | |
403dbb97 TG |
2448 | #ifdef CONFIG_IP_PIMSM_V2 |
2449 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
2450 | printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); | |
2451 | err = -EAGAIN; | |
2452 | goto add_proto_fail; | |
2453 | } | |
2454 | #endif | |
cb6a4e46 | 2455 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute); |
03d2f897 | 2456 | return 0; |
f6bb4514 | 2457 | |
403dbb97 TG |
2458 | #ifdef CONFIG_IP_PIMSM_V2 |
2459 | add_proto_fail: | |
2460 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2461 | #endif | |
c3e38896 | 2462 | reg_notif_fail: |
cf958ae3 BT |
2463 | unregister_pernet_subsys(&ipmr_net_ops); |
2464 | reg_pernet_fail: | |
c3e38896 | 2465 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2466 | return err; |
1da177e4 | 2467 | } |