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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 | ||
5c0a66f5 BT |
580 | static inline void ipmr_cache_free(struct mfc_cache *c) |
581 | { | |
5c0a66f5 BT |
582 | kmem_cache_free(mrt_cachep, c); |
583 | } | |
584 | ||
1da177e4 LT |
585 | /* Destroy an unresolved cache entry, killing queued skbs |
586 | and reporting error to netlink readers. | |
587 | */ | |
588 | ||
0c12295a | 589 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 590 | { |
8de53dfb | 591 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 592 | struct sk_buff *skb; |
9ef1d4c7 | 593 | struct nlmsgerr *e; |
1da177e4 | 594 | |
0c12295a | 595 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 596 | |
c354e124 | 597 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 598 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
599 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
600 | nlh->nlmsg_type = NLMSG_ERROR; | |
601 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
602 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
603 | e = NLMSG_DATA(nlh); |
604 | e->error = -ETIMEDOUT; | |
605 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 606 | |
4feb88e5 | 607 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 LT |
608 | } else |
609 | kfree_skb(skb); | |
610 | } | |
611 | ||
5c0a66f5 | 612 | ipmr_cache_free(c); |
1da177e4 LT |
613 | } |
614 | ||
615 | ||
e258beb2 | 616 | /* Timer process for the unresolved queue. */ |
1da177e4 | 617 | |
e258beb2 | 618 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 619 | { |
0c12295a | 620 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
621 | unsigned long now; |
622 | unsigned long expires; | |
862465f2 | 623 | struct mfc_cache *c, *next; |
1da177e4 LT |
624 | |
625 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 626 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
627 | return; |
628 | } | |
629 | ||
0c12295a | 630 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
631 | goto out; |
632 | ||
633 | now = jiffies; | |
634 | expires = 10*HZ; | |
1da177e4 | 635 | |
0c12295a | 636 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
637 | if (time_after(c->mfc_un.unres.expires, now)) { |
638 | unsigned long interval = c->mfc_un.unres.expires - now; | |
639 | if (interval < expires) | |
640 | expires = interval; | |
1da177e4 LT |
641 | continue; |
642 | } | |
643 | ||
862465f2 | 644 | list_del(&c->list); |
0c12295a | 645 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
646 | } |
647 | ||
0c12295a PM |
648 | if (!list_empty(&mrt->mfc_unres_queue)) |
649 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
650 | |
651 | out: | |
652 | spin_unlock(&mfc_unres_lock); | |
653 | } | |
654 | ||
655 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
656 | ||
0c12295a | 657 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 658 | unsigned char *ttls) |
1da177e4 LT |
659 | { |
660 | int vifi; | |
661 | ||
662 | cache->mfc_un.res.minvif = MAXVIFS; | |
663 | cache->mfc_un.res.maxvif = 0; | |
664 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
665 | ||
0c12295a PM |
666 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
667 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 668 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
669 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
670 | if (cache->mfc_un.res.minvif > vifi) | |
671 | cache->mfc_un.res.minvif = vifi; | |
672 | if (cache->mfc_un.res.maxvif <= vifi) | |
673 | cache->mfc_un.res.maxvif = vifi + 1; | |
674 | } | |
675 | } | |
676 | } | |
677 | ||
0c12295a PM |
678 | static int vif_add(struct net *net, struct mr_table *mrt, |
679 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
680 | { |
681 | int vifi = vifc->vifc_vifi; | |
0c12295a | 682 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
683 | struct net_device *dev; |
684 | struct in_device *in_dev; | |
d607032d | 685 | int err; |
1da177e4 LT |
686 | |
687 | /* Is vif busy ? */ | |
0c12295a | 688 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
689 | return -EADDRINUSE; |
690 | ||
691 | switch (vifc->vifc_flags) { | |
692 | #ifdef CONFIG_IP_PIMSM | |
693 | case VIFF_REGISTER: | |
694 | /* | |
695 | * Special Purpose VIF in PIM | |
696 | * All the packets will be sent to the daemon | |
697 | */ | |
0c12295a | 698 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 699 | return -EADDRINUSE; |
f0ad0860 | 700 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
701 | if (!dev) |
702 | return -ENOBUFS; | |
d607032d WC |
703 | err = dev_set_allmulti(dev, 1); |
704 | if (err) { | |
705 | unregister_netdevice(dev); | |
7dc00c82 | 706 | dev_put(dev); |
d607032d WC |
707 | return err; |
708 | } | |
1da177e4 LT |
709 | break; |
710 | #endif | |
e905a9ed | 711 | case VIFF_TUNNEL: |
4feb88e5 | 712 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
713 | if (!dev) |
714 | return -ENOBUFS; | |
d607032d WC |
715 | err = dev_set_allmulti(dev, 1); |
716 | if (err) { | |
717 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 718 | dev_put(dev); |
d607032d WC |
719 | return err; |
720 | } | |
1da177e4 | 721 | break; |
ee5e81f0 I |
722 | |
723 | case VIFF_USE_IFINDEX: | |
1da177e4 | 724 | case 0: |
ee5e81f0 I |
725 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
726 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
95ae6b22 | 727 | if (dev && __in_dev_get_rtnl(dev) == NULL) { |
ee5e81f0 I |
728 | dev_put(dev); |
729 | return -EADDRNOTAVAIL; | |
730 | } | |
731 | } else | |
732 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); | |
733 | ||
1da177e4 LT |
734 | if (!dev) |
735 | return -EADDRNOTAVAIL; | |
d607032d | 736 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
737 | if (err) { |
738 | dev_put(dev); | |
d607032d | 739 | return err; |
7dc00c82 | 740 | } |
1da177e4 LT |
741 | break; |
742 | default: | |
743 | return -EINVAL; | |
744 | } | |
745 | ||
d0490cfd DC |
746 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
747 | dev_put(dev); | |
1da177e4 | 748 | return -EADDRNOTAVAIL; |
d0490cfd | 749 | } |
42f811b8 | 750 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
751 | ip_rt_multicast_event(in_dev); |
752 | ||
753 | /* | |
754 | * Fill in the VIF structures | |
755 | */ | |
c354e124 JK |
756 | v->rate_limit = vifc->vifc_rate_limit; |
757 | v->local = vifc->vifc_lcl_addr.s_addr; | |
758 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
759 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
760 | if (!mrtsock) |
761 | v->flags |= VIFF_STATIC; | |
c354e124 | 762 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
763 | v->bytes_in = 0; |
764 | v->bytes_out = 0; | |
765 | v->pkt_in = 0; | |
766 | v->pkt_out = 0; | |
767 | v->link = dev->ifindex; | |
768 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
769 | v->link = dev->iflink; | |
770 | ||
771 | /* And finish update writing critical data */ | |
772 | write_lock_bh(&mrt_lock); | |
c354e124 | 773 | v->dev = dev; |
1da177e4 LT |
774 | #ifdef CONFIG_IP_PIMSM |
775 | if (v->flags&VIFF_REGISTER) | |
0c12295a | 776 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 777 | #endif |
0c12295a PM |
778 | if (vifi+1 > mrt->maxvif) |
779 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
780 | write_unlock_bh(&mrt_lock); |
781 | return 0; | |
782 | } | |
783 | ||
0c12295a | 784 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
785 | __be32 origin, |
786 | __be32 mcastgrp) | |
1da177e4 | 787 | { |
c354e124 | 788 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
789 | struct mfc_cache *c; |
790 | ||
0c12295a | 791 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
792 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
793 | return c; | |
1da177e4 | 794 | } |
862465f2 | 795 | return NULL; |
1da177e4 LT |
796 | } |
797 | ||
798 | /* | |
799 | * Allocate a multicast cache entry | |
800 | */ | |
d658f8a0 | 801 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 802 | { |
c354e124 JK |
803 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
804 | if (c == NULL) | |
1da177e4 | 805 | return NULL; |
1da177e4 LT |
806 | c->mfc_un.res.minvif = MAXVIFS; |
807 | return c; | |
808 | } | |
809 | ||
d658f8a0 | 810 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 811 | { |
c354e124 JK |
812 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
813 | if (c == NULL) | |
1da177e4 | 814 | return NULL; |
1da177e4 LT |
815 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
816 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
817 | return c; | |
818 | } | |
819 | ||
820 | /* | |
821 | * A cache entry has gone into a resolved state from queued | |
822 | */ | |
e905a9ed | 823 | |
0c12295a PM |
824 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
825 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
826 | { |
827 | struct sk_buff *skb; | |
9ef1d4c7 | 828 | struct nlmsgerr *e; |
1da177e4 LT |
829 | |
830 | /* | |
831 | * Play the pending entries through our router | |
832 | */ | |
833 | ||
c354e124 | 834 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 835 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
836 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
837 | ||
cb6a4e46 | 838 | if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
27a884dc ACM |
839 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
840 | (u8 *)nlh); | |
1da177e4 LT |
841 | } else { |
842 | nlh->nlmsg_type = NLMSG_ERROR; | |
843 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
844 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
845 | e = NLMSG_DATA(nlh); |
846 | e->error = -EMSGSIZE; | |
847 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 848 | } |
2942e900 | 849 | |
d658f8a0 | 850 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 | 851 | } else |
0c12295a | 852 | ip_mr_forward(net, mrt, skb, c, 0); |
1da177e4 LT |
853 | } |
854 | } | |
855 | ||
856 | /* | |
857 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
858 | * expects the following bizarre scheme. | |
859 | * | |
860 | * Called under mrt_lock. | |
861 | */ | |
e905a9ed | 862 | |
0c12295a | 863 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 864 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
865 | { |
866 | struct sk_buff *skb; | |
c9bdd4b5 | 867 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
868 | struct igmphdr *igmp; |
869 | struct igmpmsg *msg; | |
4c968709 | 870 | struct sock *mroute_sk; |
1da177e4 LT |
871 | int ret; |
872 | ||
873 | #ifdef CONFIG_IP_PIMSM | |
874 | if (assert == IGMPMSG_WHOLEPKT) | |
875 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
876 | else | |
877 | #endif | |
878 | skb = alloc_skb(128, GFP_ATOMIC); | |
879 | ||
132adf54 | 880 | if (!skb) |
1da177e4 LT |
881 | return -ENOBUFS; |
882 | ||
883 | #ifdef CONFIG_IP_PIMSM | |
884 | if (assert == IGMPMSG_WHOLEPKT) { | |
885 | /* Ugly, but we have no choice with this interface. | |
886 | Duplicate old header, fix ihl, length etc. | |
887 | And all this only to mangle msg->im_msgtype and | |
888 | to set msg->im_mbz to "mbz" :-) | |
889 | */ | |
878c8145 ACM |
890 | skb_push(skb, sizeof(struct iphdr)); |
891 | skb_reset_network_header(skb); | |
badff6d0 | 892 | skb_reset_transport_header(skb); |
0272ffc4 | 893 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 894 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
895 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
896 | msg->im_mbz = 0; | |
0c12295a | 897 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
898 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
899 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
900 | sizeof(struct iphdr)); | |
e905a9ed | 901 | } else |
1da177e4 | 902 | #endif |
e905a9ed YH |
903 | { |
904 | ||
1da177e4 LT |
905 | /* |
906 | * Copy the IP header | |
907 | */ | |
908 | ||
27a884dc | 909 | skb->network_header = skb->tail; |
ddc7b8e3 | 910 | skb_put(skb, ihl); |
27d7ff46 | 911 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
912 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
913 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 | 914 | msg->im_vif = vifi; |
adf30907 | 915 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 LT |
916 | |
917 | /* | |
918 | * Add our header | |
919 | */ | |
920 | ||
c354e124 | 921 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
922 | igmp->type = |
923 | msg->im_msgtype = assert; | |
924 | igmp->code = 0; | |
eddc9ec5 | 925 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 926 | skb->transport_header = skb->network_header; |
e905a9ed | 927 | } |
1da177e4 | 928 | |
4c968709 ED |
929 | rcu_read_lock(); |
930 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
931 | if (mroute_sk == NULL) { | |
932 | rcu_read_unlock(); | |
1da177e4 LT |
933 | kfree_skb(skb); |
934 | return -EINVAL; | |
935 | } | |
936 | ||
937 | /* | |
938 | * Deliver to mrouted | |
939 | */ | |
4c968709 ED |
940 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
941 | rcu_read_unlock(); | |
70a269e6 | 942 | if (ret < 0) { |
1da177e4 LT |
943 | if (net_ratelimit()) |
944 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
945 | kfree_skb(skb); | |
946 | } | |
947 | ||
948 | return ret; | |
949 | } | |
950 | ||
951 | /* | |
952 | * Queue a packet for resolution. It gets locked cache entry! | |
953 | */ | |
e905a9ed | 954 | |
1da177e4 | 955 | static int |
0c12295a | 956 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 957 | { |
862465f2 | 958 | bool found = false; |
1da177e4 LT |
959 | int err; |
960 | struct mfc_cache *c; | |
eddc9ec5 | 961 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
962 | |
963 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 964 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 965 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
966 | c->mfc_origin == iph->saddr) { |
967 | found = true; | |
1da177e4 | 968 | break; |
862465f2 | 969 | } |
1da177e4 LT |
970 | } |
971 | ||
862465f2 | 972 | if (!found) { |
1da177e4 LT |
973 | /* |
974 | * Create a new entry if allowable | |
975 | */ | |
976 | ||
0c12295a | 977 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 978 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
979 | spin_unlock_bh(&mfc_unres_lock); |
980 | ||
981 | kfree_skb(skb); | |
982 | return -ENOBUFS; | |
983 | } | |
984 | ||
985 | /* | |
986 | * Fill in the new cache entry | |
987 | */ | |
eddc9ec5 ACM |
988 | c->mfc_parent = -1; |
989 | c->mfc_origin = iph->saddr; | |
990 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
991 | |
992 | /* | |
993 | * Reflect first query at mrouted. | |
994 | */ | |
0c12295a | 995 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 996 | if (err < 0) { |
e905a9ed | 997 | /* If the report failed throw the cache entry |
1da177e4 LT |
998 | out - Brad Parker |
999 | */ | |
1000 | spin_unlock_bh(&mfc_unres_lock); | |
1001 | ||
5c0a66f5 | 1002 | ipmr_cache_free(c); |
1da177e4 LT |
1003 | kfree_skb(skb); |
1004 | return err; | |
1005 | } | |
1006 | ||
0c12295a PM |
1007 | atomic_inc(&mrt->cache_resolve_queue_len); |
1008 | list_add(&c->list, &mrt->mfc_unres_queue); | |
1da177e4 | 1009 | |
278554bd DM |
1010 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1011 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* | |
1015 | * See if we can append the packet | |
1016 | */ | |
1017 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
1018 | kfree_skb(skb); | |
1019 | err = -ENOBUFS; | |
1020 | } else { | |
c354e124 | 1021 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1022 | err = 0; |
1023 | } | |
1024 | ||
1025 | spin_unlock_bh(&mfc_unres_lock); | |
1026 | return err; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * MFC cache manipulation by user space mroute daemon | |
1031 | */ | |
1032 | ||
0c12295a | 1033 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc) |
1da177e4 LT |
1034 | { |
1035 | int line; | |
862465f2 | 1036 | struct mfc_cache *c, *next; |
1da177e4 | 1037 | |
c354e124 | 1038 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1039 | |
0c12295a | 1040 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 LT |
1041 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
1042 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
1043 | write_lock_bh(&mrt_lock); | |
862465f2 | 1044 | list_del(&c->list); |
1da177e4 LT |
1045 | write_unlock_bh(&mrt_lock); |
1046 | ||
5c0a66f5 | 1047 | ipmr_cache_free(c); |
1da177e4 LT |
1048 | return 0; |
1049 | } | |
1050 | } | |
1051 | return -ENOENT; | |
1052 | } | |
1053 | ||
0c12295a PM |
1054 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
1055 | struct mfcctl *mfc, int mrtsock) | |
1da177e4 | 1056 | { |
862465f2 | 1057 | bool found = false; |
1da177e4 | 1058 | int line; |
862465f2 | 1059 | struct mfc_cache *uc, *c; |
1da177e4 | 1060 | |
a50436f2 PM |
1061 | if (mfc->mfcc_parent >= MAXVIFS) |
1062 | return -ENFILE; | |
1063 | ||
c354e124 | 1064 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1065 | |
0c12295a | 1066 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1067 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
862465f2 PM |
1068 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { |
1069 | found = true; | |
1da177e4 | 1070 | break; |
862465f2 | 1071 | } |
1da177e4 LT |
1072 | } |
1073 | ||
862465f2 | 1074 | if (found) { |
1da177e4 LT |
1075 | write_lock_bh(&mrt_lock); |
1076 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1077 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1078 | if (!mrtsock) |
1079 | c->mfc_flags |= MFC_STATIC; | |
1080 | write_unlock_bh(&mrt_lock); | |
1081 | return 0; | |
1082 | } | |
1083 | ||
f97c1e0c | 1084 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1085 | return -EINVAL; |
1086 | ||
d658f8a0 | 1087 | c = ipmr_cache_alloc(); |
c354e124 | 1088 | if (c == NULL) |
1da177e4 LT |
1089 | return -ENOMEM; |
1090 | ||
c354e124 JK |
1091 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1092 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1093 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1094 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1095 | if (!mrtsock) |
1096 | c->mfc_flags |= MFC_STATIC; | |
1097 | ||
1098 | write_lock_bh(&mrt_lock); | |
0c12295a | 1099 | list_add(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1100 | write_unlock_bh(&mrt_lock); |
1101 | ||
1102 | /* | |
1103 | * Check to see if we resolved a queued list. If so we | |
1104 | * need to send on the frames and tidy up. | |
1105 | */ | |
b0ebb739 | 1106 | found = false; |
1da177e4 | 1107 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1108 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1109 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1110 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1111 | list_del(&uc->list); |
0c12295a | 1112 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1113 | found = true; |
1da177e4 LT |
1114 | break; |
1115 | } | |
1116 | } | |
0c12295a PM |
1117 | if (list_empty(&mrt->mfc_unres_queue)) |
1118 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1119 | spin_unlock_bh(&mfc_unres_lock); |
1120 | ||
b0ebb739 | 1121 | if (found) { |
0c12295a | 1122 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1123 | ipmr_cache_free(uc); |
1da177e4 LT |
1124 | } |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Close the multicast socket, and clear the vif tables etc | |
1130 | */ | |
e905a9ed | 1131 | |
0c12295a | 1132 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1133 | { |
1134 | int i; | |
d17fa6fa | 1135 | LIST_HEAD(list); |
862465f2 | 1136 | struct mfc_cache *c, *next; |
e905a9ed | 1137 | |
1da177e4 LT |
1138 | /* |
1139 | * Shut down all active vif entries | |
1140 | */ | |
0c12295a PM |
1141 | for (i = 0; i < mrt->maxvif; i++) { |
1142 | if (!(mrt->vif_table[i].flags&VIFF_STATIC)) | |
1143 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1144 | } |
d17fa6fa | 1145 | unregister_netdevice_many(&list); |
1da177e4 LT |
1146 | |
1147 | /* | |
1148 | * Wipe the cache | |
1149 | */ | |
862465f2 | 1150 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1151 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
862465f2 | 1152 | if (c->mfc_flags&MFC_STATIC) |
1da177e4 | 1153 | continue; |
1da177e4 | 1154 | write_lock_bh(&mrt_lock); |
862465f2 | 1155 | list_del(&c->list); |
1da177e4 LT |
1156 | write_unlock_bh(&mrt_lock); |
1157 | ||
5c0a66f5 | 1158 | ipmr_cache_free(c); |
1da177e4 LT |
1159 | } |
1160 | } | |
1161 | ||
0c12295a | 1162 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1163 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1164 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1165 | list_del(&c->list); |
0c12295a | 1166 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1167 | } |
1168 | spin_unlock_bh(&mfc_unres_lock); | |
1169 | } | |
1170 | } | |
1171 | ||
4c968709 ED |
1172 | /* called from ip_ra_control(), before an RCU grace period, |
1173 | * we dont need to call synchronize_rcu() here | |
1174 | */ | |
1da177e4 LT |
1175 | static void mrtsock_destruct(struct sock *sk) |
1176 | { | |
4feb88e5 | 1177 | struct net *net = sock_net(sk); |
f0ad0860 | 1178 | struct mr_table *mrt; |
4feb88e5 | 1179 | |
1da177e4 | 1180 | rtnl_lock(); |
f0ad0860 | 1181 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1182 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1183 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
4c968709 | 1184 | rcu_assign_pointer(mrt->mroute_sk, NULL); |
f0ad0860 PM |
1185 | mroute_clean_tables(mrt); |
1186 | } | |
1da177e4 LT |
1187 | } |
1188 | rtnl_unlock(); | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Socket options and virtual interface manipulation. The whole | |
1193 | * virtual interface system is a complete heap, but unfortunately | |
1194 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1195 | * MOSPF/PIM router set up we can clean this up. | |
1196 | */ | |
e905a9ed | 1197 | |
b7058842 | 1198 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1199 | { |
1200 | int ret; | |
1201 | struct vifctl vif; | |
1202 | struct mfcctl mfc; | |
4feb88e5 | 1203 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1204 | struct mr_table *mrt; |
1205 | ||
1206 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1207 | if (mrt == NULL) | |
1208 | return -ENOENT; | |
e905a9ed | 1209 | |
132adf54 | 1210 | if (optname != MRT_INIT) { |
4c968709 ED |
1211 | if (sk != rcu_dereference_raw(mrt->mroute_sk) && |
1212 | !capable(CAP_NET_ADMIN)) | |
1da177e4 LT |
1213 | return -EACCES; |
1214 | } | |
1215 | ||
132adf54 SH |
1216 | switch (optname) { |
1217 | case MRT_INIT: | |
1218 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1219 | inet_sk(sk)->inet_num != IPPROTO_IGMP) |
132adf54 | 1220 | return -EOPNOTSUPP; |
c354e124 | 1221 | if (optlen != sizeof(int)) |
132adf54 | 1222 | return -ENOPROTOOPT; |
1da177e4 | 1223 | |
132adf54 | 1224 | rtnl_lock(); |
4c968709 | 1225 | if (rtnl_dereference(mrt->mroute_sk)) { |
1da177e4 | 1226 | rtnl_unlock(); |
132adf54 SH |
1227 | return -EADDRINUSE; |
1228 | } | |
1229 | ||
1230 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1231 | if (ret == 0) { | |
4c968709 | 1232 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1233 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
132adf54 SH |
1234 | } |
1235 | rtnl_unlock(); | |
1236 | return ret; | |
1237 | case MRT_DONE: | |
4c968709 | 1238 | if (sk != rcu_dereference_raw(mrt->mroute_sk)) |
132adf54 SH |
1239 | return -EACCES; |
1240 | return ip_ra_control(sk, 0, NULL); | |
1241 | case MRT_ADD_VIF: | |
1242 | case MRT_DEL_VIF: | |
c354e124 | 1243 | if (optlen != sizeof(vif)) |
132adf54 | 1244 | return -EINVAL; |
c354e124 | 1245 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1246 | return -EFAULT; |
1247 | if (vif.vifc_vifi >= MAXVIFS) | |
1248 | return -ENFILE; | |
1249 | rtnl_lock(); | |
c354e124 | 1250 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1251 | ret = vif_add(net, mrt, &vif, |
1252 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1253 | } else { |
0c12295a | 1254 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1255 | } |
1256 | rtnl_unlock(); | |
1257 | return ret; | |
1da177e4 LT |
1258 | |
1259 | /* | |
1260 | * Manipulate the forwarding caches. These live | |
1261 | * in a sort of kernel/user symbiosis. | |
1262 | */ | |
132adf54 SH |
1263 | case MRT_ADD_MFC: |
1264 | case MRT_DEL_MFC: | |
c354e124 | 1265 | if (optlen != sizeof(mfc)) |
132adf54 | 1266 | return -EINVAL; |
c354e124 | 1267 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
1268 | return -EFAULT; |
1269 | rtnl_lock(); | |
c354e124 | 1270 | if (optname == MRT_DEL_MFC) |
0c12295a | 1271 | ret = ipmr_mfc_delete(mrt, &mfc); |
132adf54 | 1272 | else |
4c968709 ED |
1273 | ret = ipmr_mfc_add(net, mrt, &mfc, |
1274 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 SH |
1275 | rtnl_unlock(); |
1276 | return ret; | |
1da177e4 LT |
1277 | /* |
1278 | * Control PIM assert. | |
1279 | */ | |
132adf54 SH |
1280 | case MRT_ASSERT: |
1281 | { | |
1282 | int v; | |
1283 | if (get_user(v,(int __user *)optval)) | |
1284 | return -EFAULT; | |
0c12295a | 1285 | mrt->mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1286 | return 0; |
1287 | } | |
1da177e4 | 1288 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1289 | case MRT_PIM: |
1290 | { | |
ba93ef74 SH |
1291 | int v; |
1292 | ||
132adf54 SH |
1293 | if (get_user(v,(int __user *)optval)) |
1294 | return -EFAULT; | |
ba93ef74 SH |
1295 | v = (v) ? 1 : 0; |
1296 | ||
132adf54 SH |
1297 | rtnl_lock(); |
1298 | ret = 0; | |
0c12295a PM |
1299 | if (v != mrt->mroute_do_pim) { |
1300 | mrt->mroute_do_pim = v; | |
1301 | mrt->mroute_do_assert = v; | |
1da177e4 | 1302 | } |
132adf54 SH |
1303 | rtnl_unlock(); |
1304 | return ret; | |
1305 | } | |
f0ad0860 PM |
1306 | #endif |
1307 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1308 | case MRT_TABLE: | |
1309 | { | |
1310 | u32 v; | |
1311 | ||
1312 | if (optlen != sizeof(u32)) | |
1313 | return -EINVAL; | |
1314 | if (get_user(v, (u32 __user *)optval)) | |
1315 | return -EFAULT; | |
f0ad0860 PM |
1316 | |
1317 | rtnl_lock(); | |
1318 | ret = 0; | |
4c968709 ED |
1319 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1320 | ret = -EBUSY; | |
1321 | } else { | |
1322 | if (!ipmr_new_table(net, v)) | |
1323 | ret = -ENOMEM; | |
1324 | raw_sk(sk)->ipmr_table = v; | |
1325 | } | |
f0ad0860 PM |
1326 | rtnl_unlock(); |
1327 | return ret; | |
1328 | } | |
1da177e4 | 1329 | #endif |
132adf54 SH |
1330 | /* |
1331 | * Spurious command, or MRT_VERSION which you cannot | |
1332 | * set. | |
1333 | */ | |
1334 | default: | |
1335 | return -ENOPROTOOPT; | |
1da177e4 LT |
1336 | } |
1337 | } | |
1338 | ||
1339 | /* | |
1340 | * Getsock opt support for the multicast routing system. | |
1341 | */ | |
e905a9ed | 1342 | |
c354e124 | 1343 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1344 | { |
1345 | int olr; | |
1346 | int val; | |
4feb88e5 | 1347 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1348 | struct mr_table *mrt; |
1349 | ||
1350 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1351 | if (mrt == NULL) | |
1352 | return -ENOENT; | |
1da177e4 | 1353 | |
c354e124 | 1354 | if (optname != MRT_VERSION && |
1da177e4 LT |
1355 | #ifdef CONFIG_IP_PIMSM |
1356 | optname!=MRT_PIM && | |
1357 | #endif | |
1358 | optname!=MRT_ASSERT) | |
1359 | return -ENOPROTOOPT; | |
1360 | ||
1361 | if (get_user(olr, optlen)) | |
1362 | return -EFAULT; | |
1363 | ||
1364 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1365 | if (olr < 0) | |
1366 | return -EINVAL; | |
e905a9ed | 1367 | |
c354e124 | 1368 | if (put_user(olr, optlen)) |
1da177e4 | 1369 | return -EFAULT; |
c354e124 JK |
1370 | if (optname == MRT_VERSION) |
1371 | val = 0x0305; | |
1da177e4 | 1372 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1373 | else if (optname == MRT_PIM) |
0c12295a | 1374 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1375 | #endif |
1376 | else | |
0c12295a | 1377 | val = mrt->mroute_do_assert; |
c354e124 | 1378 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1379 | return -EFAULT; |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * The IP multicast ioctl support routines. | |
1385 | */ | |
e905a9ed | 1386 | |
1da177e4 LT |
1387 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1388 | { | |
1389 | struct sioc_sg_req sr; | |
1390 | struct sioc_vif_req vr; | |
1391 | struct vif_device *vif; | |
1392 | struct mfc_cache *c; | |
4feb88e5 | 1393 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1394 | struct mr_table *mrt; |
1395 | ||
1396 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1397 | if (mrt == NULL) | |
1398 | return -ENOENT; | |
e905a9ed | 1399 | |
132adf54 SH |
1400 | switch (cmd) { |
1401 | case SIOCGETVIFCNT: | |
c354e124 | 1402 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1403 | return -EFAULT; |
0c12295a | 1404 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1405 | return -EINVAL; |
1406 | read_lock(&mrt_lock); | |
0c12295a PM |
1407 | vif = &mrt->vif_table[vr.vifi]; |
1408 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1409 | vr.icount = vif->pkt_in; |
1410 | vr.ocount = vif->pkt_out; | |
1411 | vr.ibytes = vif->bytes_in; | |
1412 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1413 | read_unlock(&mrt_lock); |
1da177e4 | 1414 | |
c354e124 | 1415 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1416 | return -EFAULT; |
1417 | return 0; | |
1418 | } | |
1419 | read_unlock(&mrt_lock); | |
1420 | return -EADDRNOTAVAIL; | |
1421 | case SIOCGETSGCNT: | |
c354e124 | 1422 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1423 | return -EFAULT; |
1424 | ||
1425 | read_lock(&mrt_lock); | |
0c12295a | 1426 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1427 | if (c) { |
1428 | sr.pktcnt = c->mfc_un.res.pkt; | |
1429 | sr.bytecnt = c->mfc_un.res.bytes; | |
1430 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1431 | read_unlock(&mrt_lock); |
132adf54 | 1432 | |
c354e124 | 1433 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1434 | return -EFAULT; |
1435 | return 0; | |
1436 | } | |
1437 | read_unlock(&mrt_lock); | |
1438 | return -EADDRNOTAVAIL; | |
1439 | default: | |
1440 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1441 | } |
1442 | } | |
1443 | ||
1444 | ||
1445 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1446 | { | |
e9dc8653 | 1447 | struct net_device *dev = ptr; |
4feb88e5 | 1448 | struct net *net = dev_net(dev); |
f0ad0860 | 1449 | struct mr_table *mrt; |
1da177e4 LT |
1450 | struct vif_device *v; |
1451 | int ct; | |
d17fa6fa | 1452 | LIST_HEAD(list); |
e9dc8653 | 1453 | |
1da177e4 LT |
1454 | if (event != NETDEV_UNREGISTER) |
1455 | return NOTIFY_DONE; | |
f0ad0860 PM |
1456 | |
1457 | ipmr_for_each_table(mrt, net) { | |
1458 | v = &mrt->vif_table[0]; | |
1459 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1460 | if (v->dev == dev) | |
1461 | vif_delete(mrt, ct, 1, &list); | |
1462 | } | |
1da177e4 | 1463 | } |
d17fa6fa | 1464 | unregister_netdevice_many(&list); |
1da177e4 LT |
1465 | return NOTIFY_DONE; |
1466 | } | |
1467 | ||
1468 | ||
c354e124 | 1469 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1470 | .notifier_call = ipmr_device_event, |
1471 | }; | |
1472 | ||
1473 | /* | |
1474 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1475 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1476 | * important for multicast video. | |
1477 | */ | |
e905a9ed | 1478 | |
114c7844 | 1479 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1480 | { |
8856dfa3 | 1481 | struct iphdr *iph; |
eddc9ec5 | 1482 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1483 | |
1484 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1485 | skb->transport_header = skb->network_header; |
8856dfa3 | 1486 | skb_reset_network_header(skb); |
eddc9ec5 | 1487 | iph = ip_hdr(skb); |
1da177e4 LT |
1488 | |
1489 | iph->version = 4; | |
e023dd64 ACM |
1490 | iph->tos = old_iph->tos; |
1491 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1492 | iph->frag_off = 0; |
1493 | iph->daddr = daddr; | |
1494 | iph->saddr = saddr; | |
1495 | iph->protocol = IPPROTO_IPIP; | |
1496 | iph->ihl = 5; | |
1497 | iph->tot_len = htons(skb->len); | |
adf30907 | 1498 | ip_select_ident(iph, skb_dst(skb), NULL); |
1da177e4 LT |
1499 | ip_send_check(iph); |
1500 | ||
1da177e4 LT |
1501 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1502 | nf_reset(skb); | |
1503 | } | |
1504 | ||
1505 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1506 | { | |
1507 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1508 | ||
adf30907 | 1509 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1510 | |
1511 | if (unlikely(opt->optlen)) | |
1512 | ip_forward_options(skb); | |
1513 | ||
1514 | return dst_output(skb); | |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * Processing handlers for ipmr_forward | |
1519 | */ | |
1520 | ||
0c12295a PM |
1521 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1522 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1523 | { |
eddc9ec5 | 1524 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1525 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1526 | struct net_device *dev; |
1527 | struct rtable *rt; | |
1528 | int encap = 0; | |
1529 | ||
1530 | if (vif->dev == NULL) | |
1531 | goto out_free; | |
1532 | ||
1533 | #ifdef CONFIG_IP_PIMSM | |
1534 | if (vif->flags & VIFF_REGISTER) { | |
1535 | vif->pkt_out++; | |
c354e124 | 1536 | vif->bytes_out += skb->len; |
cf3677ae PE |
1537 | vif->dev->stats.tx_bytes += skb->len; |
1538 | vif->dev->stats.tx_packets++; | |
0c12295a | 1539 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1540 | goto out_free; |
1da177e4 LT |
1541 | } |
1542 | #endif | |
1543 | ||
1544 | if (vif->flags&VIFF_TUNNEL) { | |
1545 | struct flowi fl = { .oif = vif->link, | |
1546 | .nl_u = { .ip4_u = | |
1547 | { .daddr = vif->remote, | |
1548 | .saddr = vif->local, | |
1549 | .tos = RT_TOS(iph->tos) } }, | |
1550 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1551 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1552 | goto out_free; |
1553 | encap = sizeof(struct iphdr); | |
1554 | } else { | |
1555 | struct flowi fl = { .oif = vif->link, | |
1556 | .nl_u = { .ip4_u = | |
1557 | { .daddr = iph->daddr, | |
1558 | .tos = RT_TOS(iph->tos) } }, | |
1559 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1560 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1561 | goto out_free; |
1562 | } | |
1563 | ||
d8d1f30b | 1564 | dev = rt->dst.dev; |
1da177e4 | 1565 | |
d8d1f30b | 1566 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 LT |
1567 | /* Do not fragment multicasts. Alas, IPv4 does not |
1568 | allow to send ICMP, so that packets will disappear | |
1569 | to blackhole. | |
1570 | */ | |
1571 | ||
7c73a6fa | 1572 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1573 | ip_rt_put(rt); |
1574 | goto out_free; | |
1575 | } | |
1576 | ||
d8d1f30b | 1577 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1578 | |
1579 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1580 | ip_rt_put(rt); |
1da177e4 LT |
1581 | goto out_free; |
1582 | } | |
1583 | ||
1584 | vif->pkt_out++; | |
c354e124 | 1585 | vif->bytes_out += skb->len; |
1da177e4 | 1586 | |
adf30907 | 1587 | skb_dst_drop(skb); |
d8d1f30b | 1588 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1589 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1590 | |
1591 | /* FIXME: forward and output firewalls used to be called here. | |
1592 | * What do we do with netfilter? -- RR */ | |
1593 | if (vif->flags & VIFF_TUNNEL) { | |
1594 | ip_encap(skb, vif->local, vif->remote); | |
1595 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1596 | vif->dev->stats.tx_packets++; |
1597 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1598 | } |
1599 | ||
1600 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1601 | ||
1602 | /* | |
1603 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1604 | * not only before forwarding, but after forwarding on all output | |
1605 | * interfaces. It is clear, if mrouter runs a multicasting | |
1606 | * program, it should receive packets not depending to what interface | |
1607 | * program is joined. | |
1608 | * If we will not make it, the program will have to join on all | |
1609 | * interfaces. On the other hand, multihoming host (or router, but | |
1610 | * not mrouter) cannot join to more than one interface - it will | |
1611 | * result in receiving multiple packets. | |
1612 | */ | |
9bbc768a | 1613 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1614 | ipmr_forward_finish); |
1615 | return; | |
1616 | ||
1617 | out_free: | |
1618 | kfree_skb(skb); | |
1da177e4 LT |
1619 | } |
1620 | ||
0c12295a | 1621 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1622 | { |
1623 | int ct; | |
0c12295a PM |
1624 | |
1625 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1626 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1627 | break; |
1628 | } | |
1629 | return ct; | |
1630 | } | |
1631 | ||
1632 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1633 | ||
0c12295a PM |
1634 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
1635 | struct sk_buff *skb, struct mfc_cache *cache, | |
1636 | int local) | |
1da177e4 LT |
1637 | { |
1638 | int psend = -1; | |
1639 | int vif, ct; | |
1640 | ||
1641 | vif = cache->mfc_parent; | |
1642 | cache->mfc_un.res.pkt++; | |
1643 | cache->mfc_un.res.bytes += skb->len; | |
1644 | ||
1645 | /* | |
1646 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1647 | */ | |
0c12295a | 1648 | if (mrt->vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1649 | int true_vifi; |
1650 | ||
511c3f92 | 1651 | if (skb_rtable(skb)->fl.iif == 0) { |
1da177e4 LT |
1652 | /* It is our own packet, looped back. |
1653 | Very complicated situation... | |
1654 | ||
1655 | The best workaround until routing daemons will be | |
1656 | fixed is not to redistribute packet, if it was | |
1657 | send through wrong interface. It means, that | |
1658 | multicast applications WILL NOT work for | |
1659 | (S,G), which have default multicast route pointing | |
1660 | to wrong oif. In any case, it is not a good | |
1661 | idea to use multicasting applications on router. | |
1662 | */ | |
1663 | goto dont_forward; | |
1664 | } | |
1665 | ||
1666 | cache->mfc_un.res.wrong_if++; | |
0c12295a | 1667 | true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1668 | |
0c12295a | 1669 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 LT |
1670 | /* pimsm uses asserts, when switching from RPT to SPT, |
1671 | so that we cannot check that packet arrived on an oif. | |
1672 | It is bad, but otherwise we would need to move pretty | |
1673 | large chunk of pimd to kernel. Ough... --ANK | |
1674 | */ | |
0c12295a | 1675 | (mrt->mroute_do_pim || |
6f9374a9 | 1676 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1677 | time_after(jiffies, |
1da177e4 LT |
1678 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1679 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1680 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1681 | } |
1682 | goto dont_forward; | |
1683 | } | |
1684 | ||
0c12295a PM |
1685 | mrt->vif_table[vif].pkt_in++; |
1686 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1687 | |
1688 | /* | |
1689 | * Forward the frame | |
1690 | */ | |
1691 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1692 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1693 | if (psend != -1) { |
1694 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1695 | if (skb2) | |
0c12295a PM |
1696 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1697 | psend); | |
1da177e4 | 1698 | } |
c354e124 | 1699 | psend = ct; |
1da177e4 LT |
1700 | } |
1701 | } | |
1702 | if (psend != -1) { | |
1703 | if (local) { | |
1704 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1705 | if (skb2) | |
0c12295a | 1706 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1707 | } else { |
0c12295a | 1708 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
1da177e4 LT |
1709 | return 0; |
1710 | } | |
1711 | } | |
1712 | ||
1713 | dont_forward: | |
1714 | if (!local) | |
1715 | kfree_skb(skb); | |
1716 | return 0; | |
1717 | } | |
1718 | ||
1719 | ||
1720 | /* | |
1721 | * Multicast packets for forwarding arrive here | |
4c968709 | 1722 | * Called with rcu_read_lock(); |
1da177e4 LT |
1723 | */ |
1724 | ||
1725 | int ip_mr_input(struct sk_buff *skb) | |
1726 | { | |
1727 | struct mfc_cache *cache; | |
4feb88e5 | 1728 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1729 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 PM |
1730 | struct mr_table *mrt; |
1731 | int err; | |
1da177e4 LT |
1732 | |
1733 | /* Packet is looped back after forward, it should not be | |
1734 | forwarded second time, but still can be delivered locally. | |
1735 | */ | |
4c968709 | 1736 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
1737 | goto dont_forward; |
1738 | ||
f0ad0860 | 1739 | err = ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt); |
e40dbc51 BG |
1740 | if (err < 0) { |
1741 | kfree_skb(skb); | |
f0ad0860 | 1742 | return err; |
e40dbc51 | 1743 | } |
f0ad0860 | 1744 | |
1da177e4 | 1745 | if (!local) { |
4c968709 ED |
1746 | if (IPCB(skb)->opt.router_alert) { |
1747 | if (ip_call_ra_chain(skb)) | |
1748 | return 0; | |
1749 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1750 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1751 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1752 | * option to IGMP packets destined to routable | |
1753 | * groups. It is very bad, because it means | |
1754 | * that we can forward NO IGMP messages. | |
1755 | */ | |
1756 | struct sock *mroute_sk; | |
1757 | ||
1758 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1759 | if (mroute_sk) { | |
1760 | nf_reset(skb); | |
1761 | raw_rcv(mroute_sk, skb); | |
1762 | return 0; | |
1763 | } | |
1da177e4 LT |
1764 | } |
1765 | } | |
1766 | ||
1767 | read_lock(&mrt_lock); | |
0c12295a | 1768 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1769 | |
1770 | /* | |
1771 | * No usable cache entry | |
1772 | */ | |
c354e124 | 1773 | if (cache == NULL) { |
1da177e4 LT |
1774 | int vif; |
1775 | ||
1776 | if (local) { | |
1777 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1778 | ip_local_deliver(skb); | |
1779 | if (skb2 == NULL) { | |
1780 | read_unlock(&mrt_lock); | |
1781 | return -ENOBUFS; | |
1782 | } | |
1783 | skb = skb2; | |
1784 | } | |
1785 | ||
0c12295a | 1786 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1787 | if (vif >= 0) { |
0eae88f3 | 1788 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
1789 | read_unlock(&mrt_lock); |
1790 | ||
0eae88f3 | 1791 | return err2; |
1da177e4 LT |
1792 | } |
1793 | read_unlock(&mrt_lock); | |
1794 | kfree_skb(skb); | |
1795 | return -ENODEV; | |
1796 | } | |
1797 | ||
0c12295a | 1798 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
1799 | |
1800 | read_unlock(&mrt_lock); | |
1801 | ||
1802 | if (local) | |
1803 | return ip_local_deliver(skb); | |
1804 | ||
1805 | return 0; | |
1806 | ||
1807 | dont_forward: | |
1808 | if (local) | |
1809 | return ip_local_deliver(skb); | |
1810 | kfree_skb(skb); | |
1811 | return 0; | |
1812 | } | |
1813 | ||
b1879204 | 1814 | #ifdef CONFIG_IP_PIMSM |
55747a0a | 1815 | /* called with rcu_read_lock() */ |
f0ad0860 PM |
1816 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
1817 | unsigned int pimlen) | |
1da177e4 | 1818 | { |
b1879204 IJ |
1819 | struct net_device *reg_dev = NULL; |
1820 | struct iphdr *encap; | |
1da177e4 | 1821 | |
b1879204 | 1822 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1823 | /* |
1824 | Check that: | |
1825 | a. packet is really destinted to a multicast group | |
1826 | b. packet is not a NULL-REGISTER | |
1827 | c. packet is not truncated | |
1828 | */ | |
f97c1e0c | 1829 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1830 | encap->tot_len == 0 || |
b1879204 IJ |
1831 | ntohs(encap->tot_len) + pimlen > skb->len) |
1832 | return 1; | |
1da177e4 LT |
1833 | |
1834 | read_lock(&mrt_lock); | |
0c12295a PM |
1835 | if (mrt->mroute_reg_vif_num >= 0) |
1836 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
1837 | read_unlock(&mrt_lock); |
1838 | ||
e905a9ed | 1839 | if (reg_dev == NULL) |
b1879204 | 1840 | return 1; |
1da177e4 | 1841 | |
b0e380b1 | 1842 | skb->mac_header = skb->network_header; |
55747a0a | 1843 | skb_pull(skb, (u8 *)encap - skb->data); |
31c7711b | 1844 | skb_reset_network_header(skb); |
1da177e4 | 1845 | skb->protocol = htons(ETH_P_IP); |
55747a0a | 1846 | skb->ip_summed = CHECKSUM_NONE; |
1da177e4 | 1847 | skb->pkt_type = PACKET_HOST; |
d19d56dd ED |
1848 | |
1849 | skb_tunnel_rx(skb, reg_dev); | |
1850 | ||
1da177e4 | 1851 | netif_rx(skb); |
b1879204 | 1852 | |
55747a0a | 1853 | return NET_RX_SUCCESS; |
b1879204 IJ |
1854 | } |
1855 | #endif | |
1856 | ||
1857 | #ifdef CONFIG_IP_PIMSM_V1 | |
1858 | /* | |
1859 | * Handle IGMP messages of PIMv1 | |
1860 | */ | |
1861 | ||
1862 | int pim_rcv_v1(struct sk_buff * skb) | |
1863 | { | |
1864 | struct igmphdr *pim; | |
4feb88e5 | 1865 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 1866 | struct mr_table *mrt; |
b1879204 IJ |
1867 | |
1868 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1869 | goto drop; | |
1870 | ||
1871 | pim = igmp_hdr(skb); | |
1872 | ||
f0ad0860 PM |
1873 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1874 | goto drop; | |
1875 | ||
0c12295a | 1876 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
1877 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1878 | goto drop; | |
1879 | ||
f0ad0860 | 1880 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
1881 | drop: |
1882 | kfree_skb(skb); | |
1883 | } | |
1da177e4 LT |
1884 | return 0; |
1885 | } | |
1886 | #endif | |
1887 | ||
1888 | #ifdef CONFIG_IP_PIMSM_V2 | |
1889 | static int pim_rcv(struct sk_buff * skb) | |
1890 | { | |
1891 | struct pimreghdr *pim; | |
f0ad0860 PM |
1892 | struct net *net = dev_net(skb->dev); |
1893 | struct mr_table *mrt; | |
1da177e4 | 1894 | |
b1879204 | 1895 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1896 | goto drop; |
1897 | ||
9c70220b | 1898 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1899 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1900 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1901 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1902 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1903 | goto drop; |
1904 | ||
f0ad0860 PM |
1905 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1906 | goto drop; | |
1907 | ||
1908 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { | |
b1879204 IJ |
1909 | drop: |
1910 | kfree_skb(skb); | |
1911 | } | |
1da177e4 LT |
1912 | return 0; |
1913 | } | |
1914 | #endif | |
1915 | ||
cb6a4e46 PM |
1916 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
1917 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 LT |
1918 | { |
1919 | int ct; | |
1920 | struct rtnexthop *nhp; | |
27a884dc | 1921 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1922 | struct rtattr *mp_head; |
1923 | ||
7438189b | 1924 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 1925 | if (c->mfc_parent >= MAXVIFS) |
7438189b ND |
1926 | return -ENOENT; |
1927 | ||
0c12295a PM |
1928 | if (VIF_EXISTS(mrt, c->mfc_parent)) |
1929 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex); | |
1da177e4 | 1930 | |
c354e124 | 1931 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1932 | |
1933 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 1934 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
1da177e4 LT |
1935 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1936 | goto rtattr_failure; | |
c354e124 | 1937 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1938 | nhp->rtnh_flags = 0; |
1939 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 1940 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
1941 | nhp->rtnh_len = sizeof(*nhp); |
1942 | } | |
1943 | } | |
1944 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1945 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1946 | rtm->rtm_type = RTN_MULTICAST; |
1947 | return 1; | |
1948 | ||
1949 | rtattr_failure: | |
dc5fc579 | 1950 | nlmsg_trim(skb, b); |
1da177e4 LT |
1951 | return -EMSGSIZE; |
1952 | } | |
1953 | ||
4feb88e5 BT |
1954 | int ipmr_get_route(struct net *net, |
1955 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1da177e4 LT |
1956 | { |
1957 | int err; | |
f0ad0860 | 1958 | struct mr_table *mrt; |
1da177e4 | 1959 | struct mfc_cache *cache; |
511c3f92 | 1960 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 1961 | |
f0ad0860 PM |
1962 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
1963 | if (mrt == NULL) | |
1964 | return -ENOENT; | |
1965 | ||
1da177e4 | 1966 | read_lock(&mrt_lock); |
0c12295a | 1967 | cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst); |
1da177e4 | 1968 | |
c354e124 | 1969 | if (cache == NULL) { |
72287490 | 1970 | struct sk_buff *skb2; |
eddc9ec5 | 1971 | struct iphdr *iph; |
1da177e4 LT |
1972 | struct net_device *dev; |
1973 | int vif; | |
1974 | ||
1975 | if (nowait) { | |
1976 | read_unlock(&mrt_lock); | |
1977 | return -EAGAIN; | |
1978 | } | |
1979 | ||
1980 | dev = skb->dev; | |
0c12295a | 1981 | if (dev == NULL || (vif = ipmr_find_vif(mrt, dev)) < 0) { |
1da177e4 LT |
1982 | read_unlock(&mrt_lock); |
1983 | return -ENODEV; | |
1984 | } | |
72287490 AK |
1985 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1986 | if (!skb2) { | |
1987 | read_unlock(&mrt_lock); | |
1988 | return -ENOMEM; | |
1989 | } | |
1990 | ||
e2d1bca7 ACM |
1991 | skb_push(skb2, sizeof(struct iphdr)); |
1992 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1993 | iph = ip_hdr(skb2); |
1994 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1995 | iph->saddr = rt->rt_src; | |
1996 | iph->daddr = rt->rt_dst; | |
1997 | iph->version = 0; | |
0c12295a | 1998 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 LT |
1999 | read_unlock(&mrt_lock); |
2000 | return err; | |
2001 | } | |
2002 | ||
2003 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
2004 | cache->mfc_flags |= MFC_NOTIFY; | |
cb6a4e46 | 2005 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 LT |
2006 | read_unlock(&mrt_lock); |
2007 | return err; | |
2008 | } | |
2009 | ||
cb6a4e46 PM |
2010 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2011 | u32 pid, u32 seq, struct mfc_cache *c) | |
2012 | { | |
2013 | struct nlmsghdr *nlh; | |
2014 | struct rtmsg *rtm; | |
2015 | ||
2016 | nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); | |
2017 | if (nlh == NULL) | |
2018 | return -EMSGSIZE; | |
2019 | ||
2020 | rtm = nlmsg_data(nlh); | |
2021 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2022 | rtm->rtm_dst_len = 32; | |
2023 | rtm->rtm_src_len = 32; | |
2024 | rtm->rtm_tos = 0; | |
2025 | rtm->rtm_table = mrt->id; | |
2026 | NLA_PUT_U32(skb, RTA_TABLE, mrt->id); | |
2027 | rtm->rtm_type = RTN_MULTICAST; | |
2028 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2029 | rtm->rtm_protocol = RTPROT_UNSPEC; | |
2030 | rtm->rtm_flags = 0; | |
2031 | ||
2032 | NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin); | |
2033 | NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp); | |
2034 | ||
2035 | if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0) | |
2036 | goto nla_put_failure; | |
2037 | ||
2038 | return nlmsg_end(skb, nlh); | |
2039 | ||
2040 | nla_put_failure: | |
2041 | nlmsg_cancel(skb, nlh); | |
2042 | return -EMSGSIZE; | |
2043 | } | |
2044 | ||
2045 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) | |
2046 | { | |
2047 | struct net *net = sock_net(skb->sk); | |
2048 | struct mr_table *mrt; | |
2049 | struct mfc_cache *mfc; | |
2050 | unsigned int t = 0, s_t; | |
2051 | unsigned int h = 0, s_h; | |
2052 | unsigned int e = 0, s_e; | |
2053 | ||
2054 | s_t = cb->args[0]; | |
2055 | s_h = cb->args[1]; | |
2056 | s_e = cb->args[2]; | |
2057 | ||
2058 | read_lock(&mrt_lock); | |
2059 | ipmr_for_each_table(mrt, net) { | |
2060 | if (t < s_t) | |
2061 | goto next_table; | |
2062 | if (t > s_t) | |
2063 | s_h = 0; | |
2064 | for (h = s_h; h < MFC_LINES; h++) { | |
2065 | list_for_each_entry(mfc, &mrt->mfc_cache_array[h], list) { | |
2066 | if (e < s_e) | |
2067 | goto next_entry; | |
2068 | if (ipmr_fill_mroute(mrt, skb, | |
2069 | NETLINK_CB(cb->skb).pid, | |
2070 | cb->nlh->nlmsg_seq, | |
2071 | mfc) < 0) | |
2072 | goto done; | |
2073 | next_entry: | |
2074 | e++; | |
2075 | } | |
2076 | e = s_e = 0; | |
2077 | } | |
2078 | s_h = 0; | |
2079 | next_table: | |
2080 | t++; | |
2081 | } | |
2082 | done: | |
2083 | read_unlock(&mrt_lock); | |
2084 | ||
2085 | cb->args[2] = e; | |
2086 | cb->args[1] = h; | |
2087 | cb->args[0] = t; | |
2088 | ||
2089 | return skb->len; | |
2090 | } | |
2091 | ||
e905a9ed | 2092 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
2093 | /* |
2094 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
2095 | */ | |
2096 | struct ipmr_vif_iter { | |
f6bb4514 | 2097 | struct seq_net_private p; |
f0ad0860 | 2098 | struct mr_table *mrt; |
1da177e4 LT |
2099 | int ct; |
2100 | }; | |
2101 | ||
f6bb4514 BT |
2102 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2103 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2104 | loff_t pos) |
2105 | { | |
f0ad0860 | 2106 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2107 | |
2108 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2109 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2110 | continue; |
e905a9ed | 2111 | if (pos-- == 0) |
0c12295a | 2112 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2113 | } |
2114 | return NULL; | |
2115 | } | |
2116 | ||
2117 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2118 | __acquires(mrt_lock) |
1da177e4 | 2119 | { |
f0ad0860 | 2120 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2121 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2122 | struct mr_table *mrt; |
2123 | ||
2124 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2125 | if (mrt == NULL) | |
2126 | return ERR_PTR(-ENOENT); | |
2127 | ||
2128 | iter->mrt = mrt; | |
f6bb4514 | 2129 | |
1da177e4 | 2130 | read_lock(&mrt_lock); |
f6bb4514 | 2131 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2132 | : SEQ_START_TOKEN; |
2133 | } | |
2134 | ||
2135 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2136 | { | |
2137 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2138 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2139 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2140 | |
2141 | ++*pos; | |
2142 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2143 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2144 | |
0c12295a PM |
2145 | while (++iter->ct < mrt->maxvif) { |
2146 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2147 | continue; |
0c12295a | 2148 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2149 | } |
2150 | return NULL; | |
2151 | } | |
2152 | ||
2153 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2154 | __releases(mrt_lock) |
1da177e4 LT |
2155 | { |
2156 | read_unlock(&mrt_lock); | |
2157 | } | |
2158 | ||
2159 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2160 | { | |
f0ad0860 PM |
2161 | struct ipmr_vif_iter *iter = seq->private; |
2162 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2163 | |
1da177e4 | 2164 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2165 | seq_puts(seq, |
1da177e4 LT |
2166 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2167 | } else { | |
2168 | const struct vif_device *vif = v; | |
2169 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2170 | ||
2171 | seq_printf(seq, | |
2172 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2173 | vif - mrt->vif_table, |
e905a9ed | 2174 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2175 | vif->bytes_out, vif->pkt_out, |
2176 | vif->flags, vif->local, vif->remote); | |
2177 | } | |
2178 | return 0; | |
2179 | } | |
2180 | ||
f690808e | 2181 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2182 | .start = ipmr_vif_seq_start, |
2183 | .next = ipmr_vif_seq_next, | |
2184 | .stop = ipmr_vif_seq_stop, | |
2185 | .show = ipmr_vif_seq_show, | |
2186 | }; | |
2187 | ||
2188 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2189 | { | |
f6bb4514 BT |
2190 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2191 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2192 | } |
2193 | ||
9a32144e | 2194 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2195 | .owner = THIS_MODULE, |
2196 | .open = ipmr_vif_open, | |
2197 | .read = seq_read, | |
2198 | .llseek = seq_lseek, | |
f6bb4514 | 2199 | .release = seq_release_net, |
1da177e4 LT |
2200 | }; |
2201 | ||
2202 | struct ipmr_mfc_iter { | |
f6bb4514 | 2203 | struct seq_net_private p; |
f0ad0860 | 2204 | struct mr_table *mrt; |
862465f2 | 2205 | struct list_head *cache; |
1da177e4 LT |
2206 | int ct; |
2207 | }; | |
2208 | ||
2209 | ||
f6bb4514 BT |
2210 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2211 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2212 | { |
f0ad0860 | 2213 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2214 | struct mfc_cache *mfc; |
2215 | ||
1da177e4 | 2216 | read_lock(&mrt_lock); |
862465f2 | 2217 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2218 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 | 2219 | list_for_each_entry(mfc, it->cache, list) |
e905a9ed | 2220 | if (pos-- == 0) |
1da177e4 | 2221 | return mfc; |
862465f2 | 2222 | } |
1da177e4 LT |
2223 | read_unlock(&mrt_lock); |
2224 | ||
1da177e4 | 2225 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2226 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2227 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2228 | if (pos-- == 0) |
1da177e4 LT |
2229 | return mfc; |
2230 | spin_unlock_bh(&mfc_unres_lock); | |
2231 | ||
2232 | it->cache = NULL; | |
2233 | return NULL; | |
2234 | } | |
2235 | ||
2236 | ||
2237 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2238 | { | |
2239 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2240 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2241 | struct mr_table *mrt; |
f6bb4514 | 2242 | |
f0ad0860 PM |
2243 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
2244 | if (mrt == NULL) | |
2245 | return ERR_PTR(-ENOENT); | |
f6bb4514 | 2246 | |
f0ad0860 | 2247 | it->mrt = mrt; |
1da177e4 LT |
2248 | it->cache = NULL; |
2249 | it->ct = 0; | |
f6bb4514 | 2250 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2251 | : SEQ_START_TOKEN; |
2252 | } | |
2253 | ||
2254 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2255 | { | |
2256 | struct mfc_cache *mfc = v; | |
2257 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2258 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2259 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2260 | |
2261 | ++*pos; | |
2262 | ||
2263 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2264 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2265 | |
862465f2 PM |
2266 | if (mfc->list.next != it->cache) |
2267 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2268 | |
0c12295a | 2269 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2270 | goto end_of_list; |
2271 | ||
0c12295a | 2272 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2273 | |
2274 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2275 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2276 | if (list_empty(it->cache)) |
2277 | continue; | |
2278 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2279 | } |
2280 | ||
2281 | /* exhausted cache_array, show unresolved */ | |
2282 | read_unlock(&mrt_lock); | |
0c12295a | 2283 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2284 | it->ct = 0; |
e905a9ed | 2285 | |
1da177e4 | 2286 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2287 | if (!list_empty(it->cache)) |
2288 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2289 | |
2290 | end_of_list: | |
2291 | spin_unlock_bh(&mfc_unres_lock); | |
2292 | it->cache = NULL; | |
2293 | ||
2294 | return NULL; | |
2295 | } | |
2296 | ||
2297 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2298 | { | |
2299 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2300 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2301 | |
0c12295a | 2302 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2303 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2304 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
1da177e4 LT |
2305 | read_unlock(&mrt_lock); |
2306 | } | |
2307 | ||
2308 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2309 | { | |
2310 | int n; | |
2311 | ||
2312 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2313 | seq_puts(seq, |
1da177e4 LT |
2314 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2315 | } else { | |
2316 | const struct mfc_cache *mfc = v; | |
2317 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2318 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2319 | |
0eae88f3 ED |
2320 | seq_printf(seq, "%08X %08X %-3hd", |
2321 | (__force u32) mfc->mfc_mcastgrp, | |
2322 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2323 | mfc->mfc_parent); |
1da177e4 | 2324 | |
0c12295a | 2325 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2326 | seq_printf(seq, " %8lu %8lu %8lu", |
2327 | mfc->mfc_un.res.pkt, | |
2328 | mfc->mfc_un.res.bytes, | |
2329 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
2330 | for (n = mfc->mfc_un.res.minvif; |
2331 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
0c12295a | 2332 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2333 | mfc->mfc_un.res.ttls[n] < 255) |
2334 | seq_printf(seq, | |
e905a9ed | 2335 | " %2d:%-3d", |
1da177e4 LT |
2336 | n, mfc->mfc_un.res.ttls[n]); |
2337 | } | |
1ea472e2 BT |
2338 | } else { |
2339 | /* unresolved mfc_caches don't contain | |
2340 | * pkt, bytes and wrong_if values | |
2341 | */ | |
2342 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2343 | } |
2344 | seq_putc(seq, '\n'); | |
2345 | } | |
2346 | return 0; | |
2347 | } | |
2348 | ||
f690808e | 2349 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2350 | .start = ipmr_mfc_seq_start, |
2351 | .next = ipmr_mfc_seq_next, | |
2352 | .stop = ipmr_mfc_seq_stop, | |
2353 | .show = ipmr_mfc_seq_show, | |
2354 | }; | |
2355 | ||
2356 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2357 | { | |
f6bb4514 BT |
2358 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2359 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2360 | } |
2361 | ||
9a32144e | 2362 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2363 | .owner = THIS_MODULE, |
2364 | .open = ipmr_mfc_open, | |
2365 | .read = seq_read, | |
2366 | .llseek = seq_lseek, | |
f6bb4514 | 2367 | .release = seq_release_net, |
1da177e4 | 2368 | }; |
e905a9ed | 2369 | #endif |
1da177e4 LT |
2370 | |
2371 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2372 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2373 | .handler = pim_rcv, |
403dbb97 | 2374 | .netns_ok = 1, |
1da177e4 LT |
2375 | }; |
2376 | #endif | |
2377 | ||
2378 | ||
2379 | /* | |
2380 | * Setup for IP multicast routing | |
2381 | */ | |
cf958ae3 BT |
2382 | static int __net_init ipmr_net_init(struct net *net) |
2383 | { | |
f0ad0860 | 2384 | int err; |
cf958ae3 | 2385 | |
f0ad0860 PM |
2386 | err = ipmr_rules_init(net); |
2387 | if (err < 0) | |
cf958ae3 | 2388 | goto fail; |
f6bb4514 BT |
2389 | |
2390 | #ifdef CONFIG_PROC_FS | |
2391 | err = -ENOMEM; | |
2392 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
2393 | goto proc_vif_fail; | |
2394 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
2395 | goto proc_cache_fail; | |
2396 | #endif | |
2bb8b26c BT |
2397 | return 0; |
2398 | ||
f6bb4514 BT |
2399 | #ifdef CONFIG_PROC_FS |
2400 | proc_cache_fail: | |
2401 | proc_net_remove(net, "ip_mr_vif"); | |
2402 | proc_vif_fail: | |
f0ad0860 | 2403 | ipmr_rules_exit(net); |
f6bb4514 | 2404 | #endif |
cf958ae3 BT |
2405 | fail: |
2406 | return err; | |
2407 | } | |
2408 | ||
2409 | static void __net_exit ipmr_net_exit(struct net *net) | |
2410 | { | |
f6bb4514 BT |
2411 | #ifdef CONFIG_PROC_FS |
2412 | proc_net_remove(net, "ip_mr_cache"); | |
2413 | proc_net_remove(net, "ip_mr_vif"); | |
2414 | #endif | |
f0ad0860 | 2415 | ipmr_rules_exit(net); |
cf958ae3 BT |
2416 | } |
2417 | ||
2418 | static struct pernet_operations ipmr_net_ops = { | |
2419 | .init = ipmr_net_init, | |
2420 | .exit = ipmr_net_exit, | |
2421 | }; | |
e905a9ed | 2422 | |
03d2f897 | 2423 | int __init ip_mr_init(void) |
1da177e4 | 2424 | { |
03d2f897 WC |
2425 | int err; |
2426 | ||
1da177e4 LT |
2427 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2428 | sizeof(struct mfc_cache), | |
e5d679f3 | 2429 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2430 | NULL); |
03d2f897 WC |
2431 | if (!mrt_cachep) |
2432 | return -ENOMEM; | |
2433 | ||
cf958ae3 BT |
2434 | err = register_pernet_subsys(&ipmr_net_ops); |
2435 | if (err) | |
2436 | goto reg_pernet_fail; | |
2437 | ||
03d2f897 WC |
2438 | err = register_netdevice_notifier(&ip_mr_notifier); |
2439 | if (err) | |
2440 | goto reg_notif_fail; | |
403dbb97 TG |
2441 | #ifdef CONFIG_IP_PIMSM_V2 |
2442 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
2443 | printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); | |
2444 | err = -EAGAIN; | |
2445 | goto add_proto_fail; | |
2446 | } | |
2447 | #endif | |
cb6a4e46 | 2448 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute); |
03d2f897 | 2449 | return 0; |
f6bb4514 | 2450 | |
403dbb97 TG |
2451 | #ifdef CONFIG_IP_PIMSM_V2 |
2452 | add_proto_fail: | |
2453 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2454 | #endif | |
c3e38896 | 2455 | reg_notif_fail: |
cf958ae3 BT |
2456 | unregister_pernet_subsys(&ipmr_net_ops); |
2457 | reg_pernet_fail: | |
c3e38896 | 2458 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2459 | return err; |
1da177e4 | 2460 | } |