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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 | ||
7c0f6ba6 | 29 | #include <linux/uaccess.h> |
1da177e4 | 30 | #include <linux/types.h> |
08009a76 | 31 | #include <linux/cache.h> |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 | 33 | #include <linux/errno.h> |
1da177e4 LT |
34 | #include <linux/mm.h> |
35 | #include <linux/kernel.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/stat.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/in.h> | |
40 | #include <linux/inet.h> | |
41 | #include <linux/netdevice.h> | |
42 | #include <linux/inetdevice.h> | |
43 | #include <linux/igmp.h> | |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/seq_file.h> | |
46 | #include <linux/mroute.h> | |
47 | #include <linux/init.h> | |
46f25dff | 48 | #include <linux/if_ether.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
457c4cbc | 50 | #include <net/net_namespace.h> |
1da177e4 LT |
51 | #include <net/ip.h> |
52 | #include <net/protocol.h> | |
53 | #include <linux/skbuff.h> | |
14c85021 | 54 | #include <net/route.h> |
1da177e4 LT |
55 | #include <net/icmp.h> |
56 | #include <net/udp.h> | |
57 | #include <net/raw.h> | |
58 | #include <linux/notifier.h> | |
59 | #include <linux/if_arp.h> | |
60 | #include <linux/netfilter_ipv4.h> | |
709b46e8 | 61 | #include <linux/compat.h> |
bc3b2d7f | 62 | #include <linux/export.h> |
c5441932 | 63 | #include <net/ip_tunnels.h> |
1da177e4 | 64 | #include <net/checksum.h> |
dc5fc579 | 65 | #include <net/netlink.h> |
f0ad0860 | 66 | #include <net/fib_rules.h> |
d67b8c61 | 67 | #include <linux/netconf.h> |
ccbb0aa6 | 68 | #include <net/nexthop.h> |
5d8b3e69 | 69 | #include <net/switchdev.h> |
1da177e4 | 70 | |
f0ad0860 PM |
71 | struct ipmr_rule { |
72 | struct fib_rule common; | |
73 | }; | |
74 | ||
75 | struct ipmr_result { | |
76 | struct mr_table *mrt; | |
77 | }; | |
78 | ||
1da177e4 | 79 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 80 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
81 | */ |
82 | ||
83 | static DEFINE_RWLOCK(mrt_lock); | |
84 | ||
7ef8f65d | 85 | /* Multicast router control variables */ |
1da177e4 | 86 | |
1da177e4 LT |
87 | /* Special spinlock for queue of unresolved entries */ |
88 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
89 | ||
90 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
91 | * entries is changed only in process context and protected |
92 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
93 | * with strong spinlock mfc_unres_lock. | |
94 | * | |
95 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
96 | */ |
97 | ||
08009a76 | 98 | static struct kmem_cache *mrt_cachep __ro_after_init; |
1da177e4 | 99 | |
f0ad0860 | 100 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
101 | static void ipmr_free_table(struct mr_table *mrt); |
102 | ||
c4854ec8 | 103 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 DS |
104 | struct net_device *dev, struct sk_buff *skb, |
105 | struct mfc_cache *cache, int local); | |
0c12295a | 106 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 107 | struct sk_buff *pkt, vifi_t vifi, int assert); |
8cd3ac9f ND |
108 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
109 | int cmd); | |
5a645dd8 | 110 | static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt); |
0e615e96 | 111 | static void mroute_clean_tables(struct mr_table *mrt, bool all); |
e99e88a9 | 112 | static void ipmr_expire_process(struct timer_list *t); |
f0ad0860 PM |
113 | |
114 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
115 | #define ipmr_for_each_table(mrt, net) \ | |
116 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
117 | ||
7b0db857 YM |
118 | static struct mr_table *ipmr_mr_table_iter(struct net *net, |
119 | struct mr_table *mrt) | |
120 | { | |
121 | struct mr_table *ret; | |
122 | ||
123 | if (!mrt) | |
124 | ret = list_entry_rcu(net->ipv4.mr_tables.next, | |
125 | struct mr_table, list); | |
126 | else | |
127 | ret = list_entry_rcu(mrt->list.next, | |
128 | struct mr_table, list); | |
129 | ||
130 | if (&ret->list == &net->ipv4.mr_tables) | |
131 | return NULL; | |
132 | return ret; | |
133 | } | |
134 | ||
f0ad0860 PM |
135 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
136 | { | |
137 | struct mr_table *mrt; | |
138 | ||
139 | ipmr_for_each_table(mrt, net) { | |
140 | if (mrt->id == id) | |
141 | return mrt; | |
142 | } | |
143 | return NULL; | |
144 | } | |
145 | ||
da91981b | 146 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
147 | struct mr_table **mrt) |
148 | { | |
f0ad0860 | 149 | int err; |
95f4a45d HFS |
150 | struct ipmr_result res; |
151 | struct fib_lookup_arg arg = { | |
152 | .result = &res, | |
153 | .flags = FIB_LOOKUP_NOREF, | |
154 | }; | |
f0ad0860 | 155 | |
e58e4159 DA |
156 | /* update flow if oif or iif point to device enslaved to l3mdev */ |
157 | l3mdev_update_flow(net, flowi4_to_flowi(flp4)); | |
158 | ||
da91981b DM |
159 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
160 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
161 | if (err < 0) |
162 | return err; | |
163 | *mrt = res.mrt; | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
168 | int flags, struct fib_lookup_arg *arg) | |
169 | { | |
170 | struct ipmr_result *res = arg->result; | |
171 | struct mr_table *mrt; | |
1da177e4 | 172 | |
f0ad0860 PM |
173 | switch (rule->action) { |
174 | case FR_ACT_TO_TBL: | |
175 | break; | |
176 | case FR_ACT_UNREACHABLE: | |
177 | return -ENETUNREACH; | |
178 | case FR_ACT_PROHIBIT: | |
179 | return -EACCES; | |
180 | case FR_ACT_BLACKHOLE: | |
181 | default: | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
e58e4159 DA |
185 | arg->table = fib_rule_get_table(rule, arg); |
186 | ||
187 | mrt = ipmr_get_table(rule->fr_net, arg->table); | |
51456b29 | 188 | if (!mrt) |
f0ad0860 PM |
189 | return -EAGAIN; |
190 | res->mrt = mrt; | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
195 | { | |
196 | return 1; | |
197 | } | |
198 | ||
199 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
200 | FRA_GENERIC_POLICY, | |
201 | }; | |
202 | ||
203 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
204 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
205 | { | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
210 | struct nlattr **tb) | |
211 | { | |
212 | return 1; | |
213 | } | |
214 | ||
215 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
216 | struct fib_rule_hdr *frh) | |
217 | { | |
218 | frh->dst_len = 0; | |
219 | frh->src_len = 0; | |
220 | frh->tos = 0; | |
221 | return 0; | |
222 | } | |
223 | ||
04a6f82c | 224 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 225 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
226 | .rule_size = sizeof(struct ipmr_rule), |
227 | .addr_size = sizeof(u32), | |
228 | .action = ipmr_rule_action, | |
229 | .match = ipmr_rule_match, | |
230 | .configure = ipmr_rule_configure, | |
231 | .compare = ipmr_rule_compare, | |
f0ad0860 PM |
232 | .fill = ipmr_rule_fill, |
233 | .nlgroup = RTNLGRP_IPV4_RULE, | |
234 | .policy = ipmr_rule_policy, | |
235 | .owner = THIS_MODULE, | |
236 | }; | |
237 | ||
238 | static int __net_init ipmr_rules_init(struct net *net) | |
239 | { | |
240 | struct fib_rules_ops *ops; | |
241 | struct mr_table *mrt; | |
242 | int err; | |
243 | ||
244 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
245 | if (IS_ERR(ops)) | |
246 | return PTR_ERR(ops); | |
247 | ||
248 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
249 | ||
250 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
1113ebbc NA |
251 | if (IS_ERR(mrt)) { |
252 | err = PTR_ERR(mrt); | |
f0ad0860 PM |
253 | goto err1; |
254 | } | |
255 | ||
256 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
257 | if (err < 0) | |
258 | goto err2; | |
259 | ||
260 | net->ipv4.mr_rules_ops = ops; | |
261 | return 0; | |
262 | ||
263 | err2: | |
f243e5a7 | 264 | ipmr_free_table(mrt); |
f0ad0860 PM |
265 | err1: |
266 | fib_rules_unregister(ops); | |
267 | return err; | |
268 | } | |
269 | ||
270 | static void __net_exit ipmr_rules_exit(struct net *net) | |
271 | { | |
272 | struct mr_table *mrt, *next; | |
273 | ||
ed785309 | 274 | rtnl_lock(); |
035320d5 ED |
275 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
276 | list_del(&mrt->list); | |
acbb219d | 277 | ipmr_free_table(mrt); |
035320d5 | 278 | } |
f0ad0860 | 279 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
419df12f | 280 | rtnl_unlock(); |
f0ad0860 | 281 | } |
4d65b948 YG |
282 | |
283 | static int ipmr_rules_dump(struct net *net, struct notifier_block *nb) | |
284 | { | |
285 | return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR); | |
286 | } | |
287 | ||
288 | static unsigned int ipmr_rules_seq_read(struct net *net) | |
289 | { | |
290 | return fib_rules_seq_read(net, RTNL_FAMILY_IPMR); | |
291 | } | |
478e4c2f YG |
292 | |
293 | bool ipmr_rule_default(const struct fib_rule *rule) | |
294 | { | |
295 | return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT; | |
296 | } | |
297 | EXPORT_SYMBOL(ipmr_rule_default); | |
f0ad0860 PM |
298 | #else |
299 | #define ipmr_for_each_table(mrt, net) \ | |
300 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
301 | ||
7b0db857 YM |
302 | static struct mr_table *ipmr_mr_table_iter(struct net *net, |
303 | struct mr_table *mrt) | |
304 | { | |
305 | if (!mrt) | |
306 | return net->ipv4.mrt; | |
307 | return NULL; | |
308 | } | |
309 | ||
f0ad0860 PM |
310 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
311 | { | |
312 | return net->ipv4.mrt; | |
313 | } | |
314 | ||
da91981b | 315 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
316 | struct mr_table **mrt) |
317 | { | |
318 | *mrt = net->ipv4.mrt; | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static int __net_init ipmr_rules_init(struct net *net) | |
323 | { | |
1113ebbc NA |
324 | struct mr_table *mrt; |
325 | ||
326 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
327 | if (IS_ERR(mrt)) | |
328 | return PTR_ERR(mrt); | |
329 | net->ipv4.mrt = mrt; | |
330 | return 0; | |
f0ad0860 PM |
331 | } |
332 | ||
333 | static void __net_exit ipmr_rules_exit(struct net *net) | |
334 | { | |
ed785309 | 335 | rtnl_lock(); |
acbb219d | 336 | ipmr_free_table(net->ipv4.mrt); |
ed785309 WC |
337 | net->ipv4.mrt = NULL; |
338 | rtnl_unlock(); | |
f0ad0860 | 339 | } |
4d65b948 YG |
340 | |
341 | static int ipmr_rules_dump(struct net *net, struct notifier_block *nb) | |
342 | { | |
343 | return 0; | |
344 | } | |
345 | ||
346 | static unsigned int ipmr_rules_seq_read(struct net *net) | |
347 | { | |
348 | return 0; | |
349 | } | |
478e4c2f YG |
350 | |
351 | bool ipmr_rule_default(const struct fib_rule *rule) | |
352 | { | |
353 | return true; | |
354 | } | |
355 | EXPORT_SYMBOL(ipmr_rule_default); | |
f0ad0860 PM |
356 | #endif |
357 | ||
8fb472c0 NA |
358 | static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, |
359 | const void *ptr) | |
360 | { | |
361 | const struct mfc_cache_cmp_arg *cmparg = arg->key; | |
362 | struct mfc_cache *c = (struct mfc_cache *)ptr; | |
363 | ||
364 | return cmparg->mfc_mcastgrp != c->mfc_mcastgrp || | |
365 | cmparg->mfc_origin != c->mfc_origin; | |
366 | } | |
367 | ||
368 | static const struct rhashtable_params ipmr_rht_params = { | |
494fff56 | 369 | .head_offset = offsetof(struct mr_mfc, mnode), |
8fb472c0 NA |
370 | .key_offset = offsetof(struct mfc_cache, cmparg), |
371 | .key_len = sizeof(struct mfc_cache_cmp_arg), | |
372 | .nelem_hint = 3, | |
373 | .locks_mul = 1, | |
374 | .obj_cmpfn = ipmr_hash_cmp, | |
375 | .automatic_shrinking = true, | |
376 | }; | |
377 | ||
0bbbf0e7 YM |
378 | static void ipmr_new_table_set(struct mr_table *mrt, |
379 | struct net *net) | |
380 | { | |
381 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
382 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
383 | #endif | |
384 | } | |
385 | ||
845c9a7a YM |
386 | static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = { |
387 | .mfc_mcastgrp = htonl(INADDR_ANY), | |
388 | .mfc_origin = htonl(INADDR_ANY), | |
389 | }; | |
390 | ||
391 | static struct mr_table_ops ipmr_mr_table_ops = { | |
392 | .rht_params = &ipmr_rht_params, | |
393 | .cmparg_any = &ipmr_mr_table_ops_cmparg_any, | |
394 | }; | |
395 | ||
f0ad0860 PM |
396 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) |
397 | { | |
398 | struct mr_table *mrt; | |
1da177e4 | 399 | |
1113ebbc NA |
400 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
401 | if (id != RT_TABLE_DEFAULT && id >= 1000000000) | |
402 | return ERR_PTR(-EINVAL); | |
403 | ||
f0ad0860 | 404 | mrt = ipmr_get_table(net, id); |
00db4124 | 405 | if (mrt) |
f0ad0860 PM |
406 | return mrt; |
407 | ||
845c9a7a | 408 | return mr_table_alloc(net, id, &ipmr_mr_table_ops, |
0bbbf0e7 | 409 | ipmr_expire_process, ipmr_new_table_set); |
f0ad0860 | 410 | } |
1da177e4 | 411 | |
acbb219d FR |
412 | static void ipmr_free_table(struct mr_table *mrt) |
413 | { | |
414 | del_timer_sync(&mrt->ipmr_expire_timer); | |
0e615e96 | 415 | mroute_clean_tables(mrt, true); |
8fb472c0 | 416 | rhltable_destroy(&mrt->mfc_hash); |
acbb219d FR |
417 | kfree(mrt); |
418 | } | |
419 | ||
1da177e4 LT |
420 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
421 | ||
d607032d WC |
422 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
423 | { | |
4feb88e5 BT |
424 | struct net *net = dev_net(dev); |
425 | ||
d607032d WC |
426 | dev_close(dev); |
427 | ||
4feb88e5 | 428 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 429 | if (dev) { |
5bc3eb7e | 430 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 431 | struct ifreq ifr; |
d607032d WC |
432 | struct ip_tunnel_parm p; |
433 | ||
434 | memset(&p, 0, sizeof(p)); | |
435 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
436 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
437 | p.iph.version = 4; | |
438 | p.iph.ihl = 5; | |
439 | p.iph.protocol = IPPROTO_IPIP; | |
440 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
441 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
442 | ||
5bc3eb7e SH |
443 | if (ops->ndo_do_ioctl) { |
444 | mm_segment_t oldfs = get_fs(); | |
445 | ||
446 | set_fs(KERNEL_DS); | |
447 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
448 | set_fs(oldfs); | |
449 | } | |
d607032d WC |
450 | } |
451 | } | |
452 | ||
a0b47736 NA |
453 | /* Initialize ipmr pimreg/tunnel in_device */ |
454 | static bool ipmr_init_vif_indev(const struct net_device *dev) | |
455 | { | |
456 | struct in_device *in_dev; | |
457 | ||
458 | ASSERT_RTNL(); | |
459 | ||
460 | in_dev = __in_dev_get_rtnl(dev); | |
461 | if (!in_dev) | |
462 | return false; | |
463 | ipv4_devconf_setall(in_dev); | |
464 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
465 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
466 | ||
467 | return true; | |
468 | } | |
469 | ||
7ef8f65d | 470 | static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
471 | { |
472 | struct net_device *dev; | |
473 | ||
4feb88e5 | 474 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
475 | |
476 | if (dev) { | |
5bc3eb7e | 477 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
478 | int err; |
479 | struct ifreq ifr; | |
1da177e4 | 480 | struct ip_tunnel_parm p; |
1da177e4 LT |
481 | |
482 | memset(&p, 0, sizeof(p)); | |
483 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
484 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
485 | p.iph.version = 4; | |
486 | p.iph.ihl = 5; | |
487 | p.iph.protocol = IPPROTO_IPIP; | |
488 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 489 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 490 | |
5bc3eb7e SH |
491 | if (ops->ndo_do_ioctl) { |
492 | mm_segment_t oldfs = get_fs(); | |
493 | ||
494 | set_fs(KERNEL_DS); | |
495 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
496 | set_fs(oldfs); | |
a8cb16dd | 497 | } else { |
5bc3eb7e | 498 | err = -EOPNOTSUPP; |
a8cb16dd | 499 | } |
1da177e4 LT |
500 | dev = NULL; |
501 | ||
4feb88e5 BT |
502 | if (err == 0 && |
503 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 | 504 | dev->flags |= IFF_MULTICAST; |
a0b47736 | 505 | if (!ipmr_init_vif_indev(dev)) |
1da177e4 | 506 | goto failure; |
1da177e4 LT |
507 | if (dev_open(dev)) |
508 | goto failure; | |
7dc00c82 | 509 | dev_hold(dev); |
1da177e4 LT |
510 | } |
511 | } | |
512 | return dev; | |
513 | ||
514 | failure: | |
1da177e4 LT |
515 | unregister_netdevice(dev); |
516 | return NULL; | |
517 | } | |
518 | ||
c316c629 | 519 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
6fef4c0c | 520 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 521 | { |
4feb88e5 | 522 | struct net *net = dev_net(dev); |
f0ad0860 | 523 | struct mr_table *mrt; |
da91981b DM |
524 | struct flowi4 fl4 = { |
525 | .flowi4_oif = dev->ifindex, | |
6a662719 | 526 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
da91981b | 527 | .flowi4_mark = skb->mark, |
f0ad0860 PM |
528 | }; |
529 | int err; | |
530 | ||
da91981b | 531 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
532 | if (err < 0) { |
533 | kfree_skb(skb); | |
f0ad0860 | 534 | return err; |
e40dbc51 | 535 | } |
4feb88e5 | 536 | |
1da177e4 | 537 | read_lock(&mrt_lock); |
cf3677ae PE |
538 | dev->stats.tx_bytes += skb->len; |
539 | dev->stats.tx_packets++; | |
0c12295a | 540 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
541 | read_unlock(&mrt_lock); |
542 | kfree_skb(skb); | |
6ed10654 | 543 | return NETDEV_TX_OK; |
1da177e4 LT |
544 | } |
545 | ||
ee9b9596 ND |
546 | static int reg_vif_get_iflink(const struct net_device *dev) |
547 | { | |
548 | return 0; | |
549 | } | |
550 | ||
007c3838 SH |
551 | static const struct net_device_ops reg_vif_netdev_ops = { |
552 | .ndo_start_xmit = reg_vif_xmit, | |
ee9b9596 | 553 | .ndo_get_iflink = reg_vif_get_iflink, |
007c3838 SH |
554 | }; |
555 | ||
1da177e4 LT |
556 | static void reg_vif_setup(struct net_device *dev) |
557 | { | |
558 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 559 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 560 | dev->flags = IFF_NOARP; |
70cb4a45 | 561 | dev->netdev_ops = ®_vif_netdev_ops; |
cf124db5 | 562 | dev->needs_free_netdev = true; |
403dbb97 | 563 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
564 | } |
565 | ||
f0ad0860 | 566 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
567 | { |
568 | struct net_device *dev; | |
f0ad0860 | 569 | char name[IFNAMSIZ]; |
1da177e4 | 570 | |
f0ad0860 PM |
571 | if (mrt->id == RT_TABLE_DEFAULT) |
572 | sprintf(name, "pimreg"); | |
573 | else | |
574 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 575 | |
c835a677 | 576 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
1da177e4 | 577 | |
51456b29 | 578 | if (!dev) |
1da177e4 LT |
579 | return NULL; |
580 | ||
403dbb97 TG |
581 | dev_net_set(dev, net); |
582 | ||
1da177e4 LT |
583 | if (register_netdevice(dev)) { |
584 | free_netdev(dev); | |
585 | return NULL; | |
586 | } | |
1da177e4 | 587 | |
a0b47736 | 588 | if (!ipmr_init_vif_indev(dev)) |
1da177e4 | 589 | goto failure; |
1da177e4 LT |
590 | if (dev_open(dev)) |
591 | goto failure; | |
592 | ||
7dc00c82 WC |
593 | dev_hold(dev); |
594 | ||
1da177e4 LT |
595 | return dev; |
596 | ||
597 | failure: | |
1da177e4 LT |
598 | unregister_netdevice(dev); |
599 | return NULL; | |
600 | } | |
c316c629 NA |
601 | |
602 | /* called with rcu_read_lock() */ | |
603 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, | |
604 | unsigned int pimlen) | |
605 | { | |
606 | struct net_device *reg_dev = NULL; | |
607 | struct iphdr *encap; | |
608 | ||
609 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); | |
7ef8f65d | 610 | /* Check that: |
c316c629 NA |
611 | * a. packet is really sent to a multicast group |
612 | * b. packet is not a NULL-REGISTER | |
613 | * c. packet is not truncated | |
614 | */ | |
615 | if (!ipv4_is_multicast(encap->daddr) || | |
616 | encap->tot_len == 0 || | |
617 | ntohs(encap->tot_len) + pimlen > skb->len) | |
618 | return 1; | |
619 | ||
620 | read_lock(&mrt_lock); | |
621 | if (mrt->mroute_reg_vif_num >= 0) | |
622 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
623 | read_unlock(&mrt_lock); | |
624 | ||
625 | if (!reg_dev) | |
626 | return 1; | |
627 | ||
628 | skb->mac_header = skb->network_header; | |
629 | skb_pull(skb, (u8 *)encap - skb->data); | |
630 | skb_reset_network_header(skb); | |
631 | skb->protocol = htons(ETH_P_IP); | |
632 | skb->ip_summed = CHECKSUM_NONE; | |
633 | ||
634 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); | |
635 | ||
636 | netif_rx(skb); | |
637 | ||
638 | return NET_RX_SUCCESS; | |
639 | } | |
640 | #else | |
641 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) | |
642 | { | |
643 | return NULL; | |
644 | } | |
1da177e4 LT |
645 | #endif |
646 | ||
b362053a YG |
647 | static int call_ipmr_vif_entry_notifiers(struct net *net, |
648 | enum fib_event_type event_type, | |
649 | struct vif_device *vif, | |
650 | vifi_t vif_index, u32 tb_id) | |
651 | { | |
bc67a0da YM |
652 | return mr_call_vif_notifiers(net, RTNL_FAMILY_IPMR, event_type, |
653 | vif, vif_index, tb_id, | |
654 | &net->ipv4.ipmr_seq); | |
b362053a YG |
655 | } |
656 | ||
b362053a YG |
657 | static int call_ipmr_mfc_entry_notifiers(struct net *net, |
658 | enum fib_event_type event_type, | |
659 | struct mfc_cache *mfc, u32 tb_id) | |
660 | { | |
54c4cad9 YM |
661 | return mr_call_mfc_notifiers(net, RTNL_FAMILY_IPMR, event_type, |
662 | &mfc->_c, tb_id, &net->ipv4.ipmr_seq); | |
b362053a YG |
663 | } |
664 | ||
2c53040f BH |
665 | /** |
666 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 667 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 668 | */ |
0c12295a | 669 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 670 | struct list_head *head) |
1da177e4 | 671 | { |
b362053a | 672 | struct net *net = read_pnet(&mrt->net); |
1da177e4 LT |
673 | struct vif_device *v; |
674 | struct net_device *dev; | |
675 | struct in_device *in_dev; | |
676 | ||
0c12295a | 677 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
678 | return -EADDRNOTAVAIL; |
679 | ||
0c12295a | 680 | v = &mrt->vif_table[vifi]; |
1da177e4 | 681 | |
b362053a YG |
682 | if (VIF_EXISTS(mrt, vifi)) |
683 | call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_DEL, v, vifi, | |
684 | mrt->id); | |
685 | ||
1da177e4 LT |
686 | write_lock_bh(&mrt_lock); |
687 | dev = v->dev; | |
688 | v->dev = NULL; | |
689 | ||
690 | if (!dev) { | |
691 | write_unlock_bh(&mrt_lock); | |
692 | return -EADDRNOTAVAIL; | |
693 | } | |
694 | ||
0c12295a PM |
695 | if (vifi == mrt->mroute_reg_vif_num) |
696 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 | 697 | |
a8cb16dd | 698 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 699 | int tmp; |
a8cb16dd ED |
700 | |
701 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 702 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
703 | break; |
704 | } | |
0c12295a | 705 | mrt->maxvif = tmp+1; |
1da177e4 LT |
706 | } |
707 | ||
708 | write_unlock_bh(&mrt_lock); | |
709 | ||
710 | dev_set_allmulti(dev, -1); | |
711 | ||
a8cb16dd ED |
712 | in_dev = __in_dev_get_rtnl(dev); |
713 | if (in_dev) { | |
42f811b8 | 714 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
3b022865 | 715 | inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, |
d67b8c61 ND |
716 | NETCONFA_MC_FORWARDING, |
717 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
718 | ip_rt_multicast_event(in_dev); |
719 | } | |
720 | ||
a8cb16dd | 721 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 722 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
723 | |
724 | dev_put(dev); | |
725 | return 0; | |
726 | } | |
727 | ||
a8c9486b | 728 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 729 | { |
494fff56 | 730 | struct mr_mfc *c = container_of(head, struct mr_mfc, rcu); |
a8c9486b | 731 | |
494fff56 | 732 | kmem_cache_free(mrt_cachep, (struct mfc_cache *)c); |
5c0a66f5 BT |
733 | } |
734 | ||
8c13af2a | 735 | static void ipmr_cache_free(struct mfc_cache *c) |
a8c9486b | 736 | { |
494fff56 | 737 | call_rcu(&c->_c.rcu, ipmr_cache_free_rcu); |
a8c9486b ED |
738 | } |
739 | ||
1da177e4 | 740 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 741 | * and reporting error to netlink readers. |
1da177e4 | 742 | */ |
0c12295a | 743 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 744 | { |
8de53dfb | 745 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 746 | struct sk_buff *skb; |
9ef1d4c7 | 747 | struct nlmsgerr *e; |
1da177e4 | 748 | |
0c12295a | 749 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 750 | |
494fff56 | 751 | while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved))) { |
eddc9ec5 | 752 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
753 | struct nlmsghdr *nlh = skb_pull(skb, |
754 | sizeof(struct iphdr)); | |
1da177e4 | 755 | nlh->nlmsg_type = NLMSG_ERROR; |
573ce260 | 756 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 757 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 758 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
759 | e->error = -ETIMEDOUT; |
760 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 761 | |
15e47304 | 762 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 763 | } else { |
1da177e4 | 764 | kfree_skb(skb); |
a8cb16dd | 765 | } |
1da177e4 LT |
766 | } |
767 | ||
5c0a66f5 | 768 | ipmr_cache_free(c); |
1da177e4 LT |
769 | } |
770 | ||
e258beb2 | 771 | /* Timer process for the unresolved queue. */ |
e99e88a9 | 772 | static void ipmr_expire_process(struct timer_list *t) |
1da177e4 | 773 | { |
e99e88a9 | 774 | struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer); |
494fff56 | 775 | struct mr_mfc *c, *next; |
1da177e4 | 776 | unsigned long expires; |
494fff56 | 777 | unsigned long now; |
1da177e4 LT |
778 | |
779 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 780 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
781 | return; |
782 | } | |
783 | ||
0c12295a | 784 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
785 | goto out; |
786 | ||
787 | now = jiffies; | |
788 | expires = 10*HZ; | |
1da177e4 | 789 | |
0c12295a | 790 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
791 | if (time_after(c->mfc_un.unres.expires, now)) { |
792 | unsigned long interval = c->mfc_un.unres.expires - now; | |
793 | if (interval < expires) | |
794 | expires = interval; | |
1da177e4 LT |
795 | continue; |
796 | } | |
797 | ||
862465f2 | 798 | list_del(&c->list); |
494fff56 YM |
799 | mroute_netlink_event(mrt, (struct mfc_cache *)c, RTM_DELROUTE); |
800 | ipmr_destroy_unres(mrt, (struct mfc_cache *)c); | |
1da177e4 LT |
801 | } |
802 | ||
0c12295a PM |
803 | if (!list_empty(&mrt->mfc_unres_queue)) |
804 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
805 | |
806 | out: | |
807 | spin_unlock(&mfc_unres_lock); | |
808 | } | |
809 | ||
810 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
494fff56 | 811 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mr_mfc *cache, |
d658f8a0 | 812 | unsigned char *ttls) |
1da177e4 LT |
813 | { |
814 | int vifi; | |
815 | ||
816 | cache->mfc_un.res.minvif = MAXVIFS; | |
817 | cache->mfc_un.res.maxvif = 0; | |
818 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
819 | ||
0c12295a PM |
820 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
821 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 822 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
823 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
824 | if (cache->mfc_un.res.minvif > vifi) | |
825 | cache->mfc_un.res.minvif = vifi; | |
826 | if (cache->mfc_un.res.maxvif <= vifi) | |
827 | cache->mfc_un.res.maxvif = vifi + 1; | |
828 | } | |
829 | } | |
90b5ca17 | 830 | cache->mfc_un.res.lastuse = jiffies; |
1da177e4 LT |
831 | } |
832 | ||
0c12295a PM |
833 | static int vif_add(struct net *net, struct mr_table *mrt, |
834 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
835 | { |
836 | int vifi = vifc->vifc_vifi; | |
5d8b3e69 YG |
837 | struct switchdev_attr attr = { |
838 | .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, | |
839 | }; | |
0c12295a | 840 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
841 | struct net_device *dev; |
842 | struct in_device *in_dev; | |
d607032d | 843 | int err; |
1da177e4 LT |
844 | |
845 | /* Is vif busy ? */ | |
0c12295a | 846 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
847 | return -EADDRINUSE; |
848 | ||
849 | switch (vifc->vifc_flags) { | |
1da177e4 | 850 | case VIFF_REGISTER: |
1973a4ea | 851 | if (!ipmr_pimsm_enabled()) |
c316c629 NA |
852 | return -EINVAL; |
853 | /* Special Purpose VIF in PIM | |
1da177e4 LT |
854 | * All the packets will be sent to the daemon |
855 | */ | |
0c12295a | 856 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 857 | return -EADDRINUSE; |
f0ad0860 | 858 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
859 | if (!dev) |
860 | return -ENOBUFS; | |
d607032d WC |
861 | err = dev_set_allmulti(dev, 1); |
862 | if (err) { | |
863 | unregister_netdevice(dev); | |
7dc00c82 | 864 | dev_put(dev); |
d607032d WC |
865 | return err; |
866 | } | |
1da177e4 | 867 | break; |
e905a9ed | 868 | case VIFF_TUNNEL: |
4feb88e5 | 869 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
870 | if (!dev) |
871 | return -ENOBUFS; | |
d607032d WC |
872 | err = dev_set_allmulti(dev, 1); |
873 | if (err) { | |
874 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 875 | dev_put(dev); |
d607032d WC |
876 | return err; |
877 | } | |
1da177e4 | 878 | break; |
ee5e81f0 | 879 | case VIFF_USE_IFINDEX: |
1da177e4 | 880 | case 0: |
ee5e81f0 I |
881 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
882 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
51456b29 | 883 | if (dev && !__in_dev_get_rtnl(dev)) { |
ee5e81f0 I |
884 | dev_put(dev); |
885 | return -EADDRNOTAVAIL; | |
886 | } | |
a8cb16dd | 887 | } else { |
ee5e81f0 | 888 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 889 | } |
1da177e4 LT |
890 | if (!dev) |
891 | return -EADDRNOTAVAIL; | |
d607032d | 892 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
893 | if (err) { |
894 | dev_put(dev); | |
d607032d | 895 | return err; |
7dc00c82 | 896 | } |
1da177e4 LT |
897 | break; |
898 | default: | |
899 | return -EINVAL; | |
900 | } | |
901 | ||
a8cb16dd ED |
902 | in_dev = __in_dev_get_rtnl(dev); |
903 | if (!in_dev) { | |
d0490cfd | 904 | dev_put(dev); |
1da177e4 | 905 | return -EADDRNOTAVAIL; |
d0490cfd | 906 | } |
42f811b8 | 907 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
3b022865 DA |
908 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING, |
909 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
910 | ip_rt_multicast_event(in_dev); |
911 | ||
a8cb16dd | 912 | /* Fill in the VIF structures */ |
6853f21f YM |
913 | vif_device_init(v, dev, vifc->vifc_rate_limit, |
914 | vifc->vifc_threshold, | |
915 | vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0), | |
916 | (VIFF_TUNNEL | VIFF_REGISTER)); | |
a8cb16dd | 917 | |
5d8b3e69 YG |
918 | attr.orig_dev = dev; |
919 | if (!switchdev_port_attr_get(dev, &attr)) { | |
920 | memcpy(v->dev_parent_id.id, attr.u.ppid.id, attr.u.ppid.id_len); | |
921 | v->dev_parent_id.id_len = attr.u.ppid.id_len; | |
922 | } else { | |
923 | v->dev_parent_id.id_len = 0; | |
924 | } | |
6853f21f | 925 | |
c354e124 JK |
926 | v->local = vifc->vifc_lcl_addr.s_addr; |
927 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
1da177e4 LT |
928 | |
929 | /* And finish update writing critical data */ | |
930 | write_lock_bh(&mrt_lock); | |
c354e124 | 931 | v->dev = dev; |
a8cb16dd | 932 | if (v->flags & VIFF_REGISTER) |
0c12295a | 933 | mrt->mroute_reg_vif_num = vifi; |
0c12295a PM |
934 | if (vifi+1 > mrt->maxvif) |
935 | mrt->maxvif = vifi+1; | |
1da177e4 | 936 | write_unlock_bh(&mrt_lock); |
b362053a | 937 | call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id); |
1da177e4 LT |
938 | return 0; |
939 | } | |
940 | ||
a8c9486b | 941 | /* called with rcu_read_lock() */ |
0c12295a | 942 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
943 | __be32 origin, |
944 | __be32 mcastgrp) | |
1da177e4 | 945 | { |
8fb472c0 NA |
946 | struct mfc_cache_cmp_arg arg = { |
947 | .mfc_mcastgrp = mcastgrp, | |
948 | .mfc_origin = origin | |
949 | }; | |
660b26dc | 950 | |
845c9a7a | 951 | return mr_mfc_find(mrt, &arg); |
660b26dc ND |
952 | } |
953 | ||
954 | /* Look for a (*,G) entry */ | |
955 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
956 | __be32 mcastgrp, int vifi) | |
957 | { | |
8fb472c0 NA |
958 | struct mfc_cache_cmp_arg arg = { |
959 | .mfc_mcastgrp = mcastgrp, | |
960 | .mfc_origin = htonl(INADDR_ANY) | |
961 | }; | |
660b26dc | 962 | |
360eb5da | 963 | if (mcastgrp == htonl(INADDR_ANY)) |
845c9a7a YM |
964 | return mr_mfc_find_any_parent(mrt, vifi); |
965 | return mr_mfc_find_any(mrt, vifi, &arg); | |
660b26dc ND |
966 | } |
967 | ||
8fb472c0 NA |
968 | /* Look for a (S,G,iif) entry if parent != -1 */ |
969 | static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt, | |
970 | __be32 origin, __be32 mcastgrp, | |
971 | int parent) | |
972 | { | |
973 | struct mfc_cache_cmp_arg arg = { | |
974 | .mfc_mcastgrp = mcastgrp, | |
975 | .mfc_origin = origin, | |
976 | }; | |
8fb472c0 | 977 | |
845c9a7a | 978 | return mr_mfc_find_parent(mrt, &arg, parent); |
8fb472c0 NA |
979 | } |
980 | ||
7ef8f65d | 981 | /* Allocate a multicast cache entry */ |
d658f8a0 | 982 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 983 | { |
c354e124 | 984 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b | 985 | |
70a0dec4 | 986 | if (c) { |
494fff56 YM |
987 | c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; |
988 | c->_c.mfc_un.res.minvif = MAXVIFS; | |
8c13af2a | 989 | c->_c.free = ipmr_cache_free_rcu; |
494fff56 | 990 | refcount_set(&c->_c.mfc_un.res.refcount, 1); |
70a0dec4 | 991 | } |
1da177e4 LT |
992 | return c; |
993 | } | |
994 | ||
d658f8a0 | 995 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 996 | { |
c354e124 | 997 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
998 | |
999 | if (c) { | |
494fff56 YM |
1000 | skb_queue_head_init(&c->_c.mfc_un.unres.unresolved); |
1001 | c->_c.mfc_un.unres.expires = jiffies + 10 * HZ; | |
a8c9486b | 1002 | } |
1da177e4 LT |
1003 | return c; |
1004 | } | |
1005 | ||
7ef8f65d | 1006 | /* A cache entry has gone into a resolved state from queued */ |
0c12295a PM |
1007 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
1008 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
1009 | { |
1010 | struct sk_buff *skb; | |
9ef1d4c7 | 1011 | struct nlmsgerr *e; |
1da177e4 | 1012 | |
a8cb16dd | 1013 | /* Play the pending entries through our router */ |
494fff56 | 1014 | while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) { |
eddc9ec5 | 1015 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
1016 | struct nlmsghdr *nlh = skb_pull(skb, |
1017 | sizeof(struct iphdr)); | |
1da177e4 | 1018 | |
7b0db857 YM |
1019 | if (mr_fill_mroute(mrt, skb, &c->_c, |
1020 | nlmsg_data(nlh)) > 0) { | |
a8cb16dd ED |
1021 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
1022 | (u8 *)nlh; | |
1da177e4 LT |
1023 | } else { |
1024 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 1025 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 1026 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 1027 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
1028 | e->error = -EMSGSIZE; |
1029 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 1030 | } |
2942e900 | 1031 | |
15e47304 | 1032 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 1033 | } else { |
4b1f0d33 | 1034 | ip_mr_forward(net, mrt, skb->dev, skb, c, 0); |
a8cb16dd | 1035 | } |
1da177e4 LT |
1036 | } |
1037 | } | |
1038 | ||
5a645dd8 | 1039 | /* Bounce a cache query up to mrouted and netlink. |
1da177e4 | 1040 | * |
c316c629 | 1041 | * Called under mrt_lock. |
1da177e4 | 1042 | */ |
0c12295a | 1043 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 1044 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 | 1045 | { |
c9bdd4b5 | 1046 | const int ihl = ip_hdrlen(pkt); |
c316c629 | 1047 | struct sock *mroute_sk; |
1da177e4 LT |
1048 | struct igmphdr *igmp; |
1049 | struct igmpmsg *msg; | |
c316c629 | 1050 | struct sk_buff *skb; |
1da177e4 LT |
1051 | int ret; |
1052 | ||
1da177e4 LT |
1053 | if (assert == IGMPMSG_WHOLEPKT) |
1054 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
1055 | else | |
1da177e4 LT |
1056 | skb = alloc_skb(128, GFP_ATOMIC); |
1057 | ||
132adf54 | 1058 | if (!skb) |
1da177e4 LT |
1059 | return -ENOBUFS; |
1060 | ||
1da177e4 LT |
1061 | if (assert == IGMPMSG_WHOLEPKT) { |
1062 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
1063 | * Duplicate old header, fix ihl, length etc. |
1064 | * And all this only to mangle msg->im_msgtype and | |
1065 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 1066 | */ |
878c8145 ACM |
1067 | skb_push(skb, sizeof(struct iphdr)); |
1068 | skb_reset_network_header(skb); | |
badff6d0 | 1069 | skb_reset_transport_header(skb); |
0272ffc4 | 1070 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 1071 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
1072 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
1073 | msg->im_mbz = 0; | |
0c12295a | 1074 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
1075 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
1076 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
1077 | sizeof(struct iphdr)); | |
c316c629 NA |
1078 | } else { |
1079 | /* Copy the IP header */ | |
1080 | skb_set_network_header(skb, skb->len); | |
1081 | skb_put(skb, ihl); | |
1082 | skb_copy_to_linear_data(skb, pkt->data, ihl); | |
1083 | /* Flag to the kernel this is a route add */ | |
1084 | ip_hdr(skb)->protocol = 0; | |
1085 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1086 | msg->im_vif = vifi; | |
1087 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); | |
1088 | /* Add our header */ | |
4df864c1 | 1089 | igmp = skb_put(skb, sizeof(struct igmphdr)); |
c316c629 NA |
1090 | igmp->type = assert; |
1091 | msg->im_msgtype = assert; | |
1092 | igmp->code = 0; | |
1093 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
1094 | skb->transport_header = skb->network_header; | |
e905a9ed | 1095 | } |
1da177e4 | 1096 | |
4c968709 ED |
1097 | rcu_read_lock(); |
1098 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
51456b29 | 1099 | if (!mroute_sk) { |
4c968709 | 1100 | rcu_read_unlock(); |
1da177e4 LT |
1101 | kfree_skb(skb); |
1102 | return -EINVAL; | |
1103 | } | |
1104 | ||
5a645dd8 JG |
1105 | igmpmsg_netlink_event(mrt, skb); |
1106 | ||
a8cb16dd | 1107 | /* Deliver to mrouted */ |
4c968709 ED |
1108 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1109 | rcu_read_unlock(); | |
70a269e6 | 1110 | if (ret < 0) { |
e87cc472 | 1111 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1112 | kfree_skb(skb); |
1113 | } | |
1114 | ||
1115 | return ret; | |
1116 | } | |
1117 | ||
7ef8f65d NA |
1118 | /* Queue a packet for resolution. It gets locked cache entry! */ |
1119 | static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, | |
4b1f0d33 | 1120 | struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 1121 | { |
8fb472c0 NA |
1122 | const struct iphdr *iph = ip_hdr(skb); |
1123 | struct mfc_cache *c; | |
862465f2 | 1124 | bool found = false; |
1da177e4 | 1125 | int err; |
1da177e4 LT |
1126 | |
1127 | spin_lock_bh(&mfc_unres_lock); | |
494fff56 | 1128 | list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) { |
e258beb2 | 1129 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1130 | c->mfc_origin == iph->saddr) { |
1131 | found = true; | |
1da177e4 | 1132 | break; |
862465f2 | 1133 | } |
1da177e4 LT |
1134 | } |
1135 | ||
862465f2 | 1136 | if (!found) { |
a8cb16dd | 1137 | /* Create a new entry if allowable */ |
0c12295a | 1138 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1139 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1140 | spin_unlock_bh(&mfc_unres_lock); |
1141 | ||
1142 | kfree_skb(skb); | |
1143 | return -ENOBUFS; | |
1144 | } | |
1145 | ||
a8cb16dd | 1146 | /* Fill in the new cache entry */ |
494fff56 | 1147 | c->_c.mfc_parent = -1; |
eddc9ec5 ACM |
1148 | c->mfc_origin = iph->saddr; |
1149 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1150 | |
a8cb16dd | 1151 | /* Reflect first query at mrouted. */ |
0c12295a | 1152 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
494fff56 | 1153 | |
4feb88e5 | 1154 | if (err < 0) { |
e905a9ed | 1155 | /* If the report failed throw the cache entry |
1da177e4 LT |
1156 | out - Brad Parker |
1157 | */ | |
1158 | spin_unlock_bh(&mfc_unres_lock); | |
1159 | ||
5c0a66f5 | 1160 | ipmr_cache_free(c); |
1da177e4 LT |
1161 | kfree_skb(skb); |
1162 | return err; | |
1163 | } | |
1164 | ||
0c12295a | 1165 | atomic_inc(&mrt->cache_resolve_queue_len); |
494fff56 | 1166 | list_add(&c->_c.list, &mrt->mfc_unres_queue); |
8cd3ac9f | 1167 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1168 | |
278554bd | 1169 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
494fff56 YM |
1170 | mod_timer(&mrt->ipmr_expire_timer, |
1171 | c->_c.mfc_un.unres.expires); | |
1da177e4 LT |
1172 | } |
1173 | ||
a8cb16dd | 1174 | /* See if we can append the packet */ |
494fff56 | 1175 | if (c->_c.mfc_un.unres.unresolved.qlen > 3) { |
1da177e4 LT |
1176 | kfree_skb(skb); |
1177 | err = -ENOBUFS; | |
1178 | } else { | |
4b1f0d33 DS |
1179 | if (dev) { |
1180 | skb->dev = dev; | |
1181 | skb->skb_iif = dev->ifindex; | |
1182 | } | |
494fff56 | 1183 | skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1184 | err = 0; |
1185 | } | |
1186 | ||
1187 | spin_unlock_bh(&mfc_unres_lock); | |
1188 | return err; | |
1189 | } | |
1190 | ||
7ef8f65d | 1191 | /* MFC cache manipulation by user space mroute daemon */ |
1da177e4 | 1192 | |
660b26dc | 1193 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 | 1194 | { |
b362053a | 1195 | struct net *net = read_pnet(&mrt->net); |
8fb472c0 | 1196 | struct mfc_cache *c; |
1da177e4 | 1197 | |
8fb472c0 NA |
1198 | /* The entries are added/deleted only under RTNL */ |
1199 | rcu_read_lock(); | |
1200 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1201 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1202 | rcu_read_unlock(); | |
1203 | if (!c) | |
1204 | return -ENOENT; | |
494fff56 YM |
1205 | rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params); |
1206 | list_del_rcu(&c->_c.list); | |
b362053a | 1207 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id); |
8fb472c0 | 1208 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
8c13af2a | 1209 | mr_cache_put(&c->_c); |
1da177e4 | 1210 | |
8fb472c0 | 1211 | return 0; |
1da177e4 LT |
1212 | } |
1213 | ||
0c12295a | 1214 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1215 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1216 | { |
862465f2 | 1217 | struct mfc_cache *uc, *c; |
494fff56 | 1218 | struct mr_mfc *_uc; |
8fb472c0 NA |
1219 | bool found; |
1220 | int ret; | |
1da177e4 | 1221 | |
a50436f2 PM |
1222 | if (mfc->mfcc_parent >= MAXVIFS) |
1223 | return -ENFILE; | |
1224 | ||
8fb472c0 NA |
1225 | /* The entries are added/deleted only under RTNL */ |
1226 | rcu_read_lock(); | |
1227 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1228 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1229 | rcu_read_unlock(); | |
1230 | if (c) { | |
1da177e4 | 1231 | write_lock_bh(&mrt_lock); |
494fff56 YM |
1232 | c->_c.mfc_parent = mfc->mfcc_parent; |
1233 | ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls); | |
1da177e4 | 1234 | if (!mrtsock) |
494fff56 | 1235 | c->_c.mfc_flags |= MFC_STATIC; |
1da177e4 | 1236 | write_unlock_bh(&mrt_lock); |
b362053a YG |
1237 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c, |
1238 | mrt->id); | |
8cd3ac9f | 1239 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1240 | return 0; |
1241 | } | |
1242 | ||
360eb5da | 1243 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1244 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1245 | return -EINVAL; |
1246 | ||
d658f8a0 | 1247 | c = ipmr_cache_alloc(); |
51456b29 | 1248 | if (!c) |
1da177e4 LT |
1249 | return -ENOMEM; |
1250 | ||
c354e124 JK |
1251 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1252 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
494fff56 YM |
1253 | c->_c.mfc_parent = mfc->mfcc_parent; |
1254 | ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls); | |
1da177e4 | 1255 | if (!mrtsock) |
494fff56 | 1256 | c->_c.mfc_flags |= MFC_STATIC; |
1da177e4 | 1257 | |
494fff56 | 1258 | ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode, |
8fb472c0 NA |
1259 | ipmr_rht_params); |
1260 | if (ret) { | |
1261 | pr_err("ipmr: rhtable insert error %d\n", ret); | |
1262 | ipmr_cache_free(c); | |
1263 | return ret; | |
1264 | } | |
494fff56 | 1265 | list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list); |
7ef8f65d NA |
1266 | /* Check to see if we resolved a queued list. If so we |
1267 | * need to send on the frames and tidy up. | |
1da177e4 | 1268 | */ |
b0ebb739 | 1269 | found = false; |
1da177e4 | 1270 | spin_lock_bh(&mfc_unres_lock); |
494fff56 YM |
1271 | list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) { |
1272 | uc = (struct mfc_cache *)_uc; | |
e258beb2 | 1273 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1274 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
494fff56 | 1275 | list_del(&_uc->list); |
0c12295a | 1276 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1277 | found = true; |
1da177e4 LT |
1278 | break; |
1279 | } | |
1280 | } | |
0c12295a PM |
1281 | if (list_empty(&mrt->mfc_unres_queue)) |
1282 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1283 | spin_unlock_bh(&mfc_unres_lock); |
1284 | ||
b0ebb739 | 1285 | if (found) { |
0c12295a | 1286 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1287 | ipmr_cache_free(uc); |
1da177e4 | 1288 | } |
b362053a | 1289 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id); |
8cd3ac9f | 1290 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1291 | return 0; |
1292 | } | |
1293 | ||
7ef8f65d | 1294 | /* Close the multicast socket, and clear the vif tables etc */ |
0e615e96 | 1295 | static void mroute_clean_tables(struct mr_table *mrt, bool all) |
1da177e4 | 1296 | { |
b362053a | 1297 | struct net *net = read_pnet(&mrt->net); |
494fff56 YM |
1298 | struct mr_mfc *c, *tmp; |
1299 | struct mfc_cache *cache; | |
d17fa6fa | 1300 | LIST_HEAD(list); |
8fb472c0 | 1301 | int i; |
e905a9ed | 1302 | |
a8cb16dd | 1303 | /* Shut down all active vif entries */ |
0c12295a | 1304 | for (i = 0; i < mrt->maxvif; i++) { |
0e615e96 NA |
1305 | if (!all && (mrt->vif_table[i].flags & VIFF_STATIC)) |
1306 | continue; | |
1307 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1308 | } |
d17fa6fa | 1309 | unregister_netdevice_many(&list); |
1da177e4 | 1310 | |
a8cb16dd | 1311 | /* Wipe the cache */ |
8fb472c0 NA |
1312 | list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { |
1313 | if (!all && (c->mfc_flags & MFC_STATIC)) | |
1314 | continue; | |
1315 | rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); | |
1316 | list_del_rcu(&c->list); | |
494fff56 YM |
1317 | cache = (struct mfc_cache *)c; |
1318 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache, | |
b362053a | 1319 | mrt->id); |
494fff56 | 1320 | mroute_netlink_event(mrt, cache, RTM_DELROUTE); |
8c13af2a | 1321 | mr_cache_put(c); |
1da177e4 LT |
1322 | } |
1323 | ||
0c12295a | 1324 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1325 | spin_lock_bh(&mfc_unres_lock); |
8fb472c0 | 1326 | list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { |
862465f2 | 1327 | list_del(&c->list); |
494fff56 YM |
1328 | cache = (struct mfc_cache *)c; |
1329 | mroute_netlink_event(mrt, cache, RTM_DELROUTE); | |
1330 | ipmr_destroy_unres(mrt, cache); | |
1da177e4 LT |
1331 | } |
1332 | spin_unlock_bh(&mfc_unres_lock); | |
1333 | } | |
1334 | } | |
1335 | ||
4c968709 ED |
1336 | /* called from ip_ra_control(), before an RCU grace period, |
1337 | * we dont need to call synchronize_rcu() here | |
1338 | */ | |
1da177e4 LT |
1339 | static void mrtsock_destruct(struct sock *sk) |
1340 | { | |
4feb88e5 | 1341 | struct net *net = sock_net(sk); |
f0ad0860 | 1342 | struct mr_table *mrt; |
4feb88e5 | 1343 | |
128aaa98 | 1344 | rtnl_lock(); |
f0ad0860 | 1345 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1346 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1347 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
3b022865 DA |
1348 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1349 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1350 | NETCONFA_IFINDEX_ALL, |
1351 | net->ipv4.devconf_all); | |
a9b3cd7f | 1352 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
0e615e96 | 1353 | mroute_clean_tables(mrt, false); |
f0ad0860 | 1354 | } |
1da177e4 | 1355 | } |
128aaa98 | 1356 | rtnl_unlock(); |
1da177e4 LT |
1357 | } |
1358 | ||
7ef8f65d NA |
1359 | /* Socket options and virtual interface manipulation. The whole |
1360 | * virtual interface system is a complete heap, but unfortunately | |
1361 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1362 | * MOSPF/PIM router set up we can clean this up. | |
1da177e4 | 1363 | */ |
e905a9ed | 1364 | |
29e97d21 NA |
1365 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, |
1366 | unsigned int optlen) | |
1da177e4 | 1367 | { |
4feb88e5 | 1368 | struct net *net = sock_net(sk); |
29e97d21 | 1369 | int val, ret = 0, parent = 0; |
f0ad0860 | 1370 | struct mr_table *mrt; |
29e97d21 NA |
1371 | struct vifctl vif; |
1372 | struct mfcctl mfc; | |
1373 | u32 uval; | |
f0ad0860 | 1374 | |
29e97d21 NA |
1375 | /* There's one exception to the lock - MRT_DONE which needs to unlock */ |
1376 | rtnl_lock(); | |
5e1859fb | 1377 | if (sk->sk_type != SOCK_RAW || |
29e97d21 NA |
1378 | inet_sk(sk)->inet_num != IPPROTO_IGMP) { |
1379 | ret = -EOPNOTSUPP; | |
1380 | goto out_unlock; | |
1381 | } | |
5e1859fb | 1382 | |
f0ad0860 | 1383 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
29e97d21 NA |
1384 | if (!mrt) { |
1385 | ret = -ENOENT; | |
1386 | goto out_unlock; | |
1387 | } | |
132adf54 | 1388 | if (optname != MRT_INIT) { |
33d480ce | 1389 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
29e97d21 NA |
1390 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
1391 | ret = -EACCES; | |
1392 | goto out_unlock; | |
1393 | } | |
1da177e4 LT |
1394 | } |
1395 | ||
132adf54 SH |
1396 | switch (optname) { |
1397 | case MRT_INIT: | |
42e6b89c | 1398 | if (optlen != sizeof(int)) { |
29e97d21 | 1399 | ret = -EINVAL; |
42e6b89c NA |
1400 | break; |
1401 | } | |
1402 | if (rtnl_dereference(mrt->mroute_sk)) { | |
29e97d21 | 1403 | ret = -EADDRINUSE; |
29e97d21 | 1404 | break; |
42e6b89c | 1405 | } |
132adf54 SH |
1406 | |
1407 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1408 | if (ret == 0) { | |
cf778b00 | 1409 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1410 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
3b022865 DA |
1411 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1412 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1413 | NETCONFA_IFINDEX_ALL, |
1414 | net->ipv4.devconf_all); | |
132adf54 | 1415 | } |
29e97d21 | 1416 | break; |
132adf54 | 1417 | case MRT_DONE: |
29e97d21 NA |
1418 | if (sk != rcu_access_pointer(mrt->mroute_sk)) { |
1419 | ret = -EACCES; | |
1420 | } else { | |
128aaa98 KT |
1421 | /* We need to unlock here because mrtsock_destruct takes |
1422 | * care of rtnl itself and we can't change that due to | |
1423 | * the IP_ROUTER_ALERT setsockopt which runs without it. | |
1424 | */ | |
1425 | rtnl_unlock(); | |
29e97d21 | 1426 | ret = ip_ra_control(sk, 0, NULL); |
128aaa98 | 1427 | goto out; |
29e97d21 NA |
1428 | } |
1429 | break; | |
132adf54 SH |
1430 | case MRT_ADD_VIF: |
1431 | case MRT_DEL_VIF: | |
29e97d21 NA |
1432 | if (optlen != sizeof(vif)) { |
1433 | ret = -EINVAL; | |
1434 | break; | |
1435 | } | |
1436 | if (copy_from_user(&vif, optval, sizeof(vif))) { | |
1437 | ret = -EFAULT; | |
1438 | break; | |
1439 | } | |
1440 | if (vif.vifc_vifi >= MAXVIFS) { | |
1441 | ret = -ENFILE; | |
1442 | break; | |
1443 | } | |
c354e124 | 1444 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1445 | ret = vif_add(net, mrt, &vif, |
1446 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1447 | } else { |
0c12295a | 1448 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 | 1449 | } |
29e97d21 | 1450 | break; |
7ef8f65d NA |
1451 | /* Manipulate the forwarding caches. These live |
1452 | * in a sort of kernel/user symbiosis. | |
1453 | */ | |
132adf54 SH |
1454 | case MRT_ADD_MFC: |
1455 | case MRT_DEL_MFC: | |
660b26dc | 1456 | parent = -1; |
fcfd6dfa | 1457 | /* fall through */ |
660b26dc ND |
1458 | case MRT_ADD_MFC_PROXY: |
1459 | case MRT_DEL_MFC_PROXY: | |
29e97d21 NA |
1460 | if (optlen != sizeof(mfc)) { |
1461 | ret = -EINVAL; | |
1462 | break; | |
1463 | } | |
1464 | if (copy_from_user(&mfc, optval, sizeof(mfc))) { | |
1465 | ret = -EFAULT; | |
1466 | break; | |
1467 | } | |
660b26dc ND |
1468 | if (parent == 0) |
1469 | parent = mfc.mfcc_parent; | |
660b26dc ND |
1470 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1471 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1472 | else |
4c968709 | 1473 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1474 | sk == rtnl_dereference(mrt->mroute_sk), |
1475 | parent); | |
29e97d21 | 1476 | break; |
7ef8f65d | 1477 | /* Control PIM assert. */ |
132adf54 | 1478 | case MRT_ASSERT: |
29e97d21 NA |
1479 | if (optlen != sizeof(val)) { |
1480 | ret = -EINVAL; | |
1481 | break; | |
1482 | } | |
1483 | if (get_user(val, (int __user *)optval)) { | |
1484 | ret = -EFAULT; | |
1485 | break; | |
1486 | } | |
1487 | mrt->mroute_do_assert = val; | |
1488 | break; | |
132adf54 | 1489 | case MRT_PIM: |
1973a4ea | 1490 | if (!ipmr_pimsm_enabled()) { |
29e97d21 NA |
1491 | ret = -ENOPROTOOPT; |
1492 | break; | |
1493 | } | |
1494 | if (optlen != sizeof(val)) { | |
1495 | ret = -EINVAL; | |
1496 | break; | |
1497 | } | |
1498 | if (get_user(val, (int __user *)optval)) { | |
1499 | ret = -EFAULT; | |
1500 | break; | |
1501 | } | |
ba93ef74 | 1502 | |
29e97d21 NA |
1503 | val = !!val; |
1504 | if (val != mrt->mroute_do_pim) { | |
1505 | mrt->mroute_do_pim = val; | |
1506 | mrt->mroute_do_assert = val; | |
1da177e4 | 1507 | } |
29e97d21 | 1508 | break; |
f0ad0860 | 1509 | case MRT_TABLE: |
29e97d21 NA |
1510 | if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) { |
1511 | ret = -ENOPROTOOPT; | |
1512 | break; | |
1513 | } | |
1514 | if (optlen != sizeof(uval)) { | |
1515 | ret = -EINVAL; | |
1516 | break; | |
1517 | } | |
1518 | if (get_user(uval, (u32 __user *)optval)) { | |
1519 | ret = -EFAULT; | |
1520 | break; | |
1521 | } | |
f0ad0860 | 1522 | |
4c968709 ED |
1523 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1524 | ret = -EBUSY; | |
1525 | } else { | |
29e97d21 | 1526 | mrt = ipmr_new_table(net, uval); |
1113ebbc NA |
1527 | if (IS_ERR(mrt)) |
1528 | ret = PTR_ERR(mrt); | |
5e1859fb | 1529 | else |
29e97d21 | 1530 | raw_sk(sk)->ipmr_table = uval; |
4c968709 | 1531 | } |
29e97d21 | 1532 | break; |
7ef8f65d | 1533 | /* Spurious command, or MRT_VERSION which you cannot set. */ |
132adf54 | 1534 | default: |
29e97d21 | 1535 | ret = -ENOPROTOOPT; |
1da177e4 | 1536 | } |
29e97d21 NA |
1537 | out_unlock: |
1538 | rtnl_unlock(); | |
128aaa98 | 1539 | out: |
29e97d21 | 1540 | return ret; |
1da177e4 LT |
1541 | } |
1542 | ||
7ef8f65d | 1543 | /* Getsock opt support for the multicast routing system. */ |
c354e124 | 1544 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1545 | { |
1546 | int olr; | |
1547 | int val; | |
4feb88e5 | 1548 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1549 | struct mr_table *mrt; |
1550 | ||
5e1859fb ED |
1551 | if (sk->sk_type != SOCK_RAW || |
1552 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1553 | return -EOPNOTSUPP; | |
1554 | ||
f0ad0860 | 1555 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1556 | if (!mrt) |
f0ad0860 | 1557 | return -ENOENT; |
1da177e4 | 1558 | |
fe9ef3ce NA |
1559 | switch (optname) { |
1560 | case MRT_VERSION: | |
1561 | val = 0x0305; | |
1562 | break; | |
1563 | case MRT_PIM: | |
1973a4ea | 1564 | if (!ipmr_pimsm_enabled()) |
fe9ef3ce NA |
1565 | return -ENOPROTOOPT; |
1566 | val = mrt->mroute_do_pim; | |
1567 | break; | |
1568 | case MRT_ASSERT: | |
1569 | val = mrt->mroute_do_assert; | |
1570 | break; | |
1571 | default: | |
1da177e4 | 1572 | return -ENOPROTOOPT; |
fe9ef3ce | 1573 | } |
1da177e4 LT |
1574 | |
1575 | if (get_user(olr, optlen)) | |
1576 | return -EFAULT; | |
1da177e4 LT |
1577 | olr = min_t(unsigned int, olr, sizeof(int)); |
1578 | if (olr < 0) | |
1579 | return -EINVAL; | |
c354e124 | 1580 | if (put_user(olr, optlen)) |
1da177e4 | 1581 | return -EFAULT; |
c354e124 | 1582 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1583 | return -EFAULT; |
1584 | return 0; | |
1585 | } | |
1586 | ||
7ef8f65d | 1587 | /* The IP multicast ioctl support routines. */ |
1da177e4 LT |
1588 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1589 | { | |
1590 | struct sioc_sg_req sr; | |
1591 | struct sioc_vif_req vr; | |
1592 | struct vif_device *vif; | |
1593 | struct mfc_cache *c; | |
4feb88e5 | 1594 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1595 | struct mr_table *mrt; |
1596 | ||
1597 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1598 | if (!mrt) |
f0ad0860 | 1599 | return -ENOENT; |
e905a9ed | 1600 | |
132adf54 SH |
1601 | switch (cmd) { |
1602 | case SIOCGETVIFCNT: | |
c354e124 | 1603 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1604 | return -EFAULT; |
0c12295a | 1605 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1606 | return -EINVAL; |
1607 | read_lock(&mrt_lock); | |
0c12295a PM |
1608 | vif = &mrt->vif_table[vr.vifi]; |
1609 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1610 | vr.icount = vif->pkt_in; |
1611 | vr.ocount = vif->pkt_out; | |
1612 | vr.ibytes = vif->bytes_in; | |
1613 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1614 | read_unlock(&mrt_lock); |
1da177e4 | 1615 | |
c354e124 | 1616 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1617 | return -EFAULT; |
1618 | return 0; | |
1619 | } | |
1620 | read_unlock(&mrt_lock); | |
1621 | return -EADDRNOTAVAIL; | |
1622 | case SIOCGETSGCNT: | |
c354e124 | 1623 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1624 | return -EFAULT; |
1625 | ||
a8c9486b | 1626 | rcu_read_lock(); |
0c12295a | 1627 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 | 1628 | if (c) { |
494fff56 YM |
1629 | sr.pktcnt = c->_c.mfc_un.res.pkt; |
1630 | sr.bytecnt = c->_c.mfc_un.res.bytes; | |
1631 | sr.wrong_if = c->_c.mfc_un.res.wrong_if; | |
a8c9486b | 1632 | rcu_read_unlock(); |
132adf54 | 1633 | |
c354e124 | 1634 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1635 | return -EFAULT; |
1636 | return 0; | |
1637 | } | |
a8c9486b | 1638 | rcu_read_unlock(); |
132adf54 SH |
1639 | return -EADDRNOTAVAIL; |
1640 | default: | |
1641 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1642 | } |
1643 | } | |
1644 | ||
709b46e8 EB |
1645 | #ifdef CONFIG_COMPAT |
1646 | struct compat_sioc_sg_req { | |
1647 | struct in_addr src; | |
1648 | struct in_addr grp; | |
1649 | compat_ulong_t pktcnt; | |
1650 | compat_ulong_t bytecnt; | |
1651 | compat_ulong_t wrong_if; | |
1652 | }; | |
1653 | ||
ca6b8bb0 DM |
1654 | struct compat_sioc_vif_req { |
1655 | vifi_t vifi; /* Which iface */ | |
1656 | compat_ulong_t icount; | |
1657 | compat_ulong_t ocount; | |
1658 | compat_ulong_t ibytes; | |
1659 | compat_ulong_t obytes; | |
1660 | }; | |
1661 | ||
709b46e8 EB |
1662 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1663 | { | |
0033d5ad | 1664 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1665 | struct compat_sioc_vif_req vr; |
1666 | struct vif_device *vif; | |
709b46e8 EB |
1667 | struct mfc_cache *c; |
1668 | struct net *net = sock_net(sk); | |
1669 | struct mr_table *mrt; | |
1670 | ||
1671 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1672 | if (!mrt) |
709b46e8 EB |
1673 | return -ENOENT; |
1674 | ||
1675 | switch (cmd) { | |
ca6b8bb0 DM |
1676 | case SIOCGETVIFCNT: |
1677 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1678 | return -EFAULT; | |
1679 | if (vr.vifi >= mrt->maxvif) | |
1680 | return -EINVAL; | |
1681 | read_lock(&mrt_lock); | |
1682 | vif = &mrt->vif_table[vr.vifi]; | |
1683 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1684 | vr.icount = vif->pkt_in; | |
1685 | vr.ocount = vif->pkt_out; | |
1686 | vr.ibytes = vif->bytes_in; | |
1687 | vr.obytes = vif->bytes_out; | |
1688 | read_unlock(&mrt_lock); | |
1689 | ||
1690 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1691 | return -EFAULT; | |
1692 | return 0; | |
1693 | } | |
1694 | read_unlock(&mrt_lock); | |
1695 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1696 | case SIOCGETSGCNT: |
1697 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1698 | return -EFAULT; | |
1699 | ||
1700 | rcu_read_lock(); | |
1701 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1702 | if (c) { | |
494fff56 YM |
1703 | sr.pktcnt = c->_c.mfc_un.res.pkt; |
1704 | sr.bytecnt = c->_c.mfc_un.res.bytes; | |
1705 | sr.wrong_if = c->_c.mfc_un.res.wrong_if; | |
709b46e8 EB |
1706 | rcu_read_unlock(); |
1707 | ||
1708 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1709 | return -EFAULT; | |
1710 | return 0; | |
1711 | } | |
1712 | rcu_read_unlock(); | |
1713 | return -EADDRNOTAVAIL; | |
1714 | default: | |
1715 | return -ENOIOCTLCMD; | |
1716 | } | |
1717 | } | |
1718 | #endif | |
1719 | ||
1da177e4 LT |
1720 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
1721 | { | |
351638e7 | 1722 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1723 | struct net *net = dev_net(dev); |
f0ad0860 | 1724 | struct mr_table *mrt; |
1da177e4 LT |
1725 | struct vif_device *v; |
1726 | int ct; | |
e9dc8653 | 1727 | |
1da177e4 LT |
1728 | if (event != NETDEV_UNREGISTER) |
1729 | return NOTIFY_DONE; | |
f0ad0860 PM |
1730 | |
1731 | ipmr_for_each_table(mrt, net) { | |
1732 | v = &mrt->vif_table[0]; | |
1733 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1734 | if (v->dev == dev) | |
e92036a6 | 1735 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1736 | } |
1da177e4 LT |
1737 | } |
1738 | return NOTIFY_DONE; | |
1739 | } | |
1740 | ||
c354e124 | 1741 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1742 | .notifier_call = ipmr_device_event, |
1743 | }; | |
1744 | ||
7ef8f65d NA |
1745 | /* Encapsulate a packet by attaching a valid IPIP header to it. |
1746 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1747 | * important for multicast video. | |
1da177e4 | 1748 | */ |
b6a7719a HFS |
1749 | static void ip_encap(struct net *net, struct sk_buff *skb, |
1750 | __be32 saddr, __be32 daddr) | |
1da177e4 | 1751 | { |
8856dfa3 | 1752 | struct iphdr *iph; |
b71d1d42 | 1753 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1754 | |
1755 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1756 | skb->transport_header = skb->network_header; |
8856dfa3 | 1757 | skb_reset_network_header(skb); |
eddc9ec5 | 1758 | iph = ip_hdr(skb); |
1da177e4 | 1759 | |
a8cb16dd | 1760 | iph->version = 4; |
e023dd64 ACM |
1761 | iph->tos = old_iph->tos; |
1762 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1763 | iph->frag_off = 0; |
1764 | iph->daddr = daddr; | |
1765 | iph->saddr = saddr; | |
1766 | iph->protocol = IPPROTO_IPIP; | |
1767 | iph->ihl = 5; | |
1768 | iph->tot_len = htons(skb->len); | |
b6a7719a | 1769 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1770 | ip_send_check(iph); |
1771 | ||
1da177e4 LT |
1772 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1773 | nf_reset(skb); | |
1774 | } | |
1775 | ||
0c4b51f0 EB |
1776 | static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
1777 | struct sk_buff *skb) | |
1da177e4 | 1778 | { |
a8cb16dd | 1779 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1780 | |
73186df8 DM |
1781 | IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
1782 | IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); | |
1da177e4 LT |
1783 | |
1784 | if (unlikely(opt->optlen)) | |
1785 | ip_forward_options(skb); | |
1786 | ||
13206b6b | 1787 | return dst_output(net, sk, skb); |
1da177e4 LT |
1788 | } |
1789 | ||
a5bc9294 YG |
1790 | #ifdef CONFIG_NET_SWITCHDEV |
1791 | static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt, | |
1792 | int in_vifi, int out_vifi) | |
1793 | { | |
1794 | struct vif_device *out_vif = &mrt->vif_table[out_vifi]; | |
1795 | struct vif_device *in_vif = &mrt->vif_table[in_vifi]; | |
1796 | ||
1797 | if (!skb->offload_mr_fwd_mark) | |
1798 | return false; | |
1799 | if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len) | |
1800 | return false; | |
1801 | return netdev_phys_item_id_same(&out_vif->dev_parent_id, | |
1802 | &in_vif->dev_parent_id); | |
1803 | } | |
1804 | #else | |
1805 | static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt, | |
1806 | int in_vifi, int out_vifi) | |
1807 | { | |
1808 | return false; | |
1809 | } | |
1810 | #endif | |
1811 | ||
7ef8f65d | 1812 | /* Processing handlers for ipmr_forward */ |
1da177e4 | 1813 | |
0c12295a | 1814 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
a5bc9294 YG |
1815 | int in_vifi, struct sk_buff *skb, |
1816 | struct mfc_cache *c, int vifi) | |
1da177e4 | 1817 | { |
eddc9ec5 | 1818 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1819 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1820 | struct net_device *dev; |
1821 | struct rtable *rt; | |
31e4543d | 1822 | struct flowi4 fl4; |
1da177e4 LT |
1823 | int encap = 0; |
1824 | ||
51456b29 | 1825 | if (!vif->dev) |
1da177e4 LT |
1826 | goto out_free; |
1827 | ||
1da177e4 LT |
1828 | if (vif->flags & VIFF_REGISTER) { |
1829 | vif->pkt_out++; | |
c354e124 | 1830 | vif->bytes_out += skb->len; |
cf3677ae PE |
1831 | vif->dev->stats.tx_bytes += skb->len; |
1832 | vif->dev->stats.tx_packets++; | |
0c12295a | 1833 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1834 | goto out_free; |
1da177e4 | 1835 | } |
1da177e4 | 1836 | |
a5bc9294 YG |
1837 | if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi)) |
1838 | goto out_free; | |
1839 | ||
a8cb16dd | 1840 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1841 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1842 | vif->remote, vif->local, |
1843 | 0, 0, | |
1844 | IPPROTO_IPIP, | |
1845 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1846 | if (IS_ERR(rt)) |
1da177e4 LT |
1847 | goto out_free; |
1848 | encap = sizeof(struct iphdr); | |
1849 | } else { | |
31e4543d | 1850 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1851 | 0, 0, |
1852 | IPPROTO_IPIP, | |
1853 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1854 | if (IS_ERR(rt)) |
1da177e4 LT |
1855 | goto out_free; |
1856 | } | |
1857 | ||
d8d1f30b | 1858 | dev = rt->dst.dev; |
1da177e4 | 1859 | |
d8d1f30b | 1860 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1861 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1862 | * allow to send ICMP, so that packets will disappear |
1863 | * to blackhole. | |
1da177e4 | 1864 | */ |
73186df8 | 1865 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1866 | ip_rt_put(rt); |
1867 | goto out_free; | |
1868 | } | |
1869 | ||
d8d1f30b | 1870 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1871 | |
1872 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1873 | ip_rt_put(rt); |
1da177e4 LT |
1874 | goto out_free; |
1875 | } | |
1876 | ||
1877 | vif->pkt_out++; | |
c354e124 | 1878 | vif->bytes_out += skb->len; |
1da177e4 | 1879 | |
adf30907 | 1880 | skb_dst_drop(skb); |
d8d1f30b | 1881 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1882 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1883 | |
1884 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1885 | * What do we do with netfilter? -- RR |
1886 | */ | |
1da177e4 | 1887 | if (vif->flags & VIFF_TUNNEL) { |
b6a7719a | 1888 | ip_encap(net, skb, vif->local, vif->remote); |
1da177e4 | 1889 | /* FIXME: extra output firewall step used to be here. --RR */ |
2f4c02d4 PE |
1890 | vif->dev->stats.tx_packets++; |
1891 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1892 | } |
1893 | ||
9ee6c5dc | 1894 | IPCB(skb)->flags |= IPSKB_FORWARDED; |
1da177e4 | 1895 | |
7ef8f65d | 1896 | /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
1da177e4 LT |
1897 | * not only before forwarding, but after forwarding on all output |
1898 | * interfaces. It is clear, if mrouter runs a multicasting | |
1899 | * program, it should receive packets not depending to what interface | |
1900 | * program is joined. | |
1901 | * If we will not make it, the program will have to join on all | |
1902 | * interfaces. On the other hand, multihoming host (or router, but | |
1903 | * not mrouter) cannot join to more than one interface - it will | |
1904 | * result in receiving multiple packets. | |
1905 | */ | |
29a26a56 EB |
1906 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, |
1907 | net, NULL, skb, skb->dev, dev, | |
1da177e4 LT |
1908 | ipmr_forward_finish); |
1909 | return; | |
1910 | ||
1911 | out_free: | |
1912 | kfree_skb(skb); | |
1da177e4 LT |
1913 | } |
1914 | ||
0c12295a | 1915 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1916 | { |
1917 | int ct; | |
0c12295a PM |
1918 | |
1919 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1920 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1921 | break; |
1922 | } | |
1923 | return ct; | |
1924 | } | |
1925 | ||
1926 | /* "local" means that we should preserve one skb (for local delivery) */ | |
c4854ec8 | 1927 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 | 1928 | struct net_device *dev, struct sk_buff *skb, |
494fff56 | 1929 | struct mfc_cache *c, int local) |
1da177e4 | 1930 | { |
4b1f0d33 | 1931 | int true_vifi = ipmr_find_vif(mrt, dev); |
1da177e4 LT |
1932 | int psend = -1; |
1933 | int vif, ct; | |
1934 | ||
494fff56 YM |
1935 | vif = c->_c.mfc_parent; |
1936 | c->_c.mfc_un.res.pkt++; | |
1937 | c->_c.mfc_un.res.bytes += skb->len; | |
1938 | c->_c.mfc_un.res.lastuse = jiffies; | |
1da177e4 | 1939 | |
494fff56 | 1940 | if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1941 | struct mfc_cache *cache_proxy; |
1942 | ||
1943 | /* For an (*,G) entry, we only check that the incomming | |
1944 | * interface is part of the static tree. | |
1945 | */ | |
845c9a7a | 1946 | cache_proxy = mr_mfc_find_any_parent(mrt, vif); |
660b26dc | 1947 | if (cache_proxy && |
494fff56 | 1948 | cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) |
660b26dc ND |
1949 | goto forward; |
1950 | } | |
1951 | ||
7ef8f65d | 1952 | /* Wrong interface: drop packet and (maybe) send PIM assert. */ |
4b1f0d33 | 1953 | if (mrt->vif_table[vif].dev != dev) { |
c7537967 | 1954 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1955 | /* It is our own packet, looped back. |
a8cb16dd ED |
1956 | * Very complicated situation... |
1957 | * | |
1958 | * The best workaround until routing daemons will be | |
1959 | * fixed is not to redistribute packet, if it was | |
1960 | * send through wrong interface. It means, that | |
1961 | * multicast applications WILL NOT work for | |
1962 | * (S,G), which have default multicast route pointing | |
1963 | * to wrong oif. In any case, it is not a good | |
1964 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1965 | */ |
1966 | goto dont_forward; | |
1967 | } | |
1968 | ||
494fff56 | 1969 | c->_c.mfc_un.res.wrong_if++; |
1da177e4 | 1970 | |
0c12295a | 1971 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1972 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1973 | * so that we cannot check that packet arrived on an oif. |
1974 | * It is bad, but otherwise we would need to move pretty | |
1975 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1976 | */ |
0c12295a | 1977 | (mrt->mroute_do_pim || |
494fff56 | 1978 | c->_c.mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1979 | time_after(jiffies, |
494fff56 YM |
1980 | c->_c.mfc_un.res.last_assert + |
1981 | MFC_ASSERT_THRESH)) { | |
1982 | c->_c.mfc_un.res.last_assert = jiffies; | |
0c12295a | 1983 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1984 | } |
1985 | goto dont_forward; | |
1986 | } | |
1987 | ||
660b26dc | 1988 | forward: |
0c12295a PM |
1989 | mrt->vif_table[vif].pkt_in++; |
1990 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 | 1991 | |
7ef8f65d | 1992 | /* Forward the frame */ |
494fff56 YM |
1993 | if (c->mfc_origin == htonl(INADDR_ANY) && |
1994 | c->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc | 1995 | if (true_vifi >= 0 && |
494fff56 | 1996 | true_vifi != c->_c.mfc_parent && |
660b26dc | 1997 | ip_hdr(skb)->ttl > |
494fff56 | 1998 | c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) { |
660b26dc ND |
1999 | /* It's an (*,*) entry and the packet is not coming from |
2000 | * the upstream: forward the packet to the upstream | |
2001 | * only. | |
2002 | */ | |
494fff56 | 2003 | psend = c->_c.mfc_parent; |
660b26dc ND |
2004 | goto last_forward; |
2005 | } | |
2006 | goto dont_forward; | |
2007 | } | |
494fff56 YM |
2008 | for (ct = c->_c.mfc_un.res.maxvif - 1; |
2009 | ct >= c->_c.mfc_un.res.minvif; ct--) { | |
660b26dc | 2010 | /* For (*,G) entry, don't forward to the incoming interface */ |
494fff56 | 2011 | if ((c->mfc_origin != htonl(INADDR_ANY) || |
360eb5da | 2012 | ct != true_vifi) && |
494fff56 | 2013 | ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) { |
1da177e4 LT |
2014 | if (psend != -1) { |
2015 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 2016 | |
1da177e4 | 2017 | if (skb2) |
a5bc9294 | 2018 | ipmr_queue_xmit(net, mrt, true_vifi, |
494fff56 | 2019 | skb2, c, psend); |
1da177e4 | 2020 | } |
c354e124 | 2021 | psend = ct; |
1da177e4 LT |
2022 | } |
2023 | } | |
660b26dc | 2024 | last_forward: |
1da177e4 LT |
2025 | if (psend != -1) { |
2026 | if (local) { | |
2027 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 2028 | |
1da177e4 | 2029 | if (skb2) |
a5bc9294 | 2030 | ipmr_queue_xmit(net, mrt, true_vifi, skb2, |
494fff56 | 2031 | c, psend); |
1da177e4 | 2032 | } else { |
494fff56 | 2033 | ipmr_queue_xmit(net, mrt, true_vifi, skb, c, psend); |
c4854ec8 | 2034 | return; |
1da177e4 LT |
2035 | } |
2036 | } | |
2037 | ||
2038 | dont_forward: | |
2039 | if (!local) | |
2040 | kfree_skb(skb); | |
1da177e4 LT |
2041 | } |
2042 | ||
417da66f | 2043 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 2044 | { |
417da66f DM |
2045 | struct rtable *rt = skb_rtable(skb); |
2046 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 2047 | struct flowi4 fl4 = { |
417da66f DM |
2048 | .daddr = iph->daddr, |
2049 | .saddr = iph->saddr, | |
b0fe4a31 | 2050 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
2051 | .flowi4_oif = (rt_is_output_route(rt) ? |
2052 | skb->dev->ifindex : 0), | |
2053 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 2054 | LOOPBACK_IFINDEX : |
4fd551d7 | 2055 | skb->dev->ifindex), |
b4869889 | 2056 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
2057 | }; |
2058 | struct mr_table *mrt; | |
2059 | int err; | |
2060 | ||
da91981b | 2061 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
2062 | if (err) |
2063 | return ERR_PTR(err); | |
2064 | return mrt; | |
2065 | } | |
1da177e4 | 2066 | |
7ef8f65d NA |
2067 | /* Multicast packets for forwarding arrive here |
2068 | * Called with rcu_read_lock(); | |
1da177e4 | 2069 | */ |
1da177e4 LT |
2070 | int ip_mr_input(struct sk_buff *skb) |
2071 | { | |
2072 | struct mfc_cache *cache; | |
4feb88e5 | 2073 | struct net *net = dev_net(skb->dev); |
511c3f92 | 2074 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 2075 | struct mr_table *mrt; |
bcfc7d33 TW |
2076 | struct net_device *dev; |
2077 | ||
2078 | /* skb->dev passed in is the loX master dev for vrfs. | |
2079 | * As there are no vifs associated with loopback devices, | |
2080 | * get the proper interface that does have a vif associated with it. | |
2081 | */ | |
2082 | dev = skb->dev; | |
2083 | if (netif_is_l3_master(skb->dev)) { | |
2084 | dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); | |
2085 | if (!dev) { | |
2086 | kfree_skb(skb); | |
2087 | return -ENODEV; | |
2088 | } | |
2089 | } | |
1da177e4 LT |
2090 | |
2091 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 2092 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 2093 | */ |
4c968709 | 2094 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
2095 | goto dont_forward; |
2096 | ||
417da66f | 2097 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2098 | if (IS_ERR(mrt)) { |
2099 | kfree_skb(skb); | |
2100 | return PTR_ERR(mrt); | |
e40dbc51 | 2101 | } |
1da177e4 | 2102 | if (!local) { |
4c968709 ED |
2103 | if (IPCB(skb)->opt.router_alert) { |
2104 | if (ip_call_ra_chain(skb)) | |
2105 | return 0; | |
2106 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
2107 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
2108 | * Cisco IOS <= 11.2(8)) do not put router alert | |
2109 | * option to IGMP packets destined to routable | |
2110 | * groups. It is very bad, because it means | |
2111 | * that we can forward NO IGMP messages. | |
2112 | */ | |
2113 | struct sock *mroute_sk; | |
2114 | ||
2115 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
2116 | if (mroute_sk) { | |
2117 | nf_reset(skb); | |
2118 | raw_rcv(mroute_sk, skb); | |
2119 | return 0; | |
2120 | } | |
1da177e4 LT |
2121 | } |
2122 | } | |
2123 | ||
a8c9486b | 2124 | /* already under rcu_read_lock() */ |
0c12295a | 2125 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
51456b29 | 2126 | if (!cache) { |
bcfc7d33 | 2127 | int vif = ipmr_find_vif(mrt, dev); |
660b26dc ND |
2128 | |
2129 | if (vif >= 0) | |
2130 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
2131 | vif); | |
2132 | } | |
1da177e4 | 2133 | |
7ef8f65d | 2134 | /* No usable cache entry */ |
51456b29 | 2135 | if (!cache) { |
1da177e4 LT |
2136 | int vif; |
2137 | ||
2138 | if (local) { | |
2139 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2140 | ip_local_deliver(skb); | |
51456b29 | 2141 | if (!skb2) |
1da177e4 | 2142 | return -ENOBUFS; |
1da177e4 LT |
2143 | skb = skb2; |
2144 | } | |
2145 | ||
a8c9486b | 2146 | read_lock(&mrt_lock); |
bcfc7d33 | 2147 | vif = ipmr_find_vif(mrt, dev); |
1da177e4 | 2148 | if (vif >= 0) { |
4b1f0d33 | 2149 | int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev); |
1da177e4 LT |
2150 | read_unlock(&mrt_lock); |
2151 | ||
0eae88f3 | 2152 | return err2; |
1da177e4 LT |
2153 | } |
2154 | read_unlock(&mrt_lock); | |
2155 | kfree_skb(skb); | |
2156 | return -ENODEV; | |
2157 | } | |
2158 | ||
a8c9486b | 2159 | read_lock(&mrt_lock); |
4b1f0d33 | 2160 | ip_mr_forward(net, mrt, dev, skb, cache, local); |
1da177e4 LT |
2161 | read_unlock(&mrt_lock); |
2162 | ||
2163 | if (local) | |
2164 | return ip_local_deliver(skb); | |
2165 | ||
2166 | return 0; | |
2167 | ||
2168 | dont_forward: | |
2169 | if (local) | |
2170 | return ip_local_deliver(skb); | |
2171 | kfree_skb(skb); | |
2172 | return 0; | |
2173 | } | |
2174 | ||
b1879204 | 2175 | #ifdef CONFIG_IP_PIMSM_V1 |
7ef8f65d | 2176 | /* Handle IGMP messages of PIMv1 */ |
a8cb16dd | 2177 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2178 | { |
2179 | struct igmphdr *pim; | |
4feb88e5 | 2180 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2181 | struct mr_table *mrt; |
b1879204 IJ |
2182 | |
2183 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2184 | goto drop; | |
2185 | ||
2186 | pim = igmp_hdr(skb); | |
2187 | ||
417da66f | 2188 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2189 | if (IS_ERR(mrt)) |
2190 | goto drop; | |
0c12295a | 2191 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2192 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2193 | goto drop; | |
2194 | ||
f0ad0860 | 2195 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2196 | drop: |
2197 | kfree_skb(skb); | |
2198 | } | |
1da177e4 LT |
2199 | return 0; |
2200 | } | |
2201 | #endif | |
2202 | ||
2203 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2204 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2205 | { |
2206 | struct pimreghdr *pim; | |
f0ad0860 PM |
2207 | struct net *net = dev_net(skb->dev); |
2208 | struct mr_table *mrt; | |
1da177e4 | 2209 | |
b1879204 | 2210 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2211 | goto drop; |
2212 | ||
9c70220b | 2213 | pim = (struct pimreghdr *)skb_transport_header(skb); |
56245cae | 2214 | if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) || |
a8cb16dd | 2215 | (pim->flags & PIM_NULL_REGISTER) || |
e905a9ed | 2216 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2217 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2218 | goto drop; |
2219 | ||
417da66f | 2220 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2221 | if (IS_ERR(mrt)) |
2222 | goto drop; | |
f0ad0860 | 2223 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2224 | drop: |
2225 | kfree_skb(skb); | |
2226 | } | |
1da177e4 LT |
2227 | return 0; |
2228 | } | |
2229 | #endif | |
2230 | ||
9a1b9496 DM |
2231 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2232 | __be32 saddr, __be32 daddr, | |
9f09eaea | 2233 | struct rtmsg *rtm, u32 portid) |
1da177e4 | 2234 | { |
1da177e4 | 2235 | struct mfc_cache *cache; |
9a1b9496 DM |
2236 | struct mr_table *mrt; |
2237 | int err; | |
1da177e4 | 2238 | |
f0ad0860 | 2239 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2240 | if (!mrt) |
f0ad0860 PM |
2241 | return -ENOENT; |
2242 | ||
a8c9486b | 2243 | rcu_read_lock(); |
9a1b9496 | 2244 | cache = ipmr_cache_find(mrt, saddr, daddr); |
51456b29 | 2245 | if (!cache && skb->dev) { |
660b26dc | 2246 | int vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2247 | |
660b26dc ND |
2248 | if (vif >= 0) |
2249 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2250 | } | |
51456b29 | 2251 | if (!cache) { |
72287490 | 2252 | struct sk_buff *skb2; |
eddc9ec5 | 2253 | struct iphdr *iph; |
1da177e4 | 2254 | struct net_device *dev; |
a8cb16dd | 2255 | int vif = -1; |
1da177e4 | 2256 | |
1da177e4 | 2257 | dev = skb->dev; |
a8c9486b | 2258 | read_lock(&mrt_lock); |
a8cb16dd ED |
2259 | if (dev) |
2260 | vif = ipmr_find_vif(mrt, dev); | |
2261 | if (vif < 0) { | |
1da177e4 | 2262 | read_unlock(&mrt_lock); |
a8c9486b | 2263 | rcu_read_unlock(); |
1da177e4 LT |
2264 | return -ENODEV; |
2265 | } | |
72287490 AK |
2266 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2267 | if (!skb2) { | |
2268 | read_unlock(&mrt_lock); | |
a8c9486b | 2269 | rcu_read_unlock(); |
72287490 AK |
2270 | return -ENOMEM; |
2271 | } | |
2272 | ||
2cf75070 | 2273 | NETLINK_CB(skb2).portid = portid; |
e2d1bca7 ACM |
2274 | skb_push(skb2, sizeof(struct iphdr)); |
2275 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2276 | iph = ip_hdr(skb2); |
2277 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2278 | iph->saddr = saddr; |
2279 | iph->daddr = daddr; | |
eddc9ec5 | 2280 | iph->version = 0; |
4b1f0d33 | 2281 | err = ipmr_cache_unresolved(mrt, vif, skb2, dev); |
1da177e4 | 2282 | read_unlock(&mrt_lock); |
a8c9486b | 2283 | rcu_read_unlock(); |
1da177e4 LT |
2284 | return err; |
2285 | } | |
2286 | ||
a8c9486b | 2287 | read_lock(&mrt_lock); |
7b0db857 | 2288 | err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); |
1da177e4 | 2289 | read_unlock(&mrt_lock); |
a8c9486b | 2290 | rcu_read_unlock(); |
1da177e4 LT |
2291 | return err; |
2292 | } | |
2293 | ||
cb6a4e46 | 2294 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2295 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2296 | int flags) | |
cb6a4e46 PM |
2297 | { |
2298 | struct nlmsghdr *nlh; | |
2299 | struct rtmsg *rtm; | |
1eb99af5 | 2300 | int err; |
cb6a4e46 | 2301 | |
65886f43 | 2302 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
51456b29 | 2303 | if (!nlh) |
cb6a4e46 PM |
2304 | return -EMSGSIZE; |
2305 | ||
2306 | rtm = nlmsg_data(nlh); | |
2307 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2308 | rtm->rtm_dst_len = 32; | |
2309 | rtm->rtm_src_len = 32; | |
2310 | rtm->rtm_tos = 0; | |
2311 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2312 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2313 | goto nla_put_failure; | |
cb6a4e46 PM |
2314 | rtm->rtm_type = RTN_MULTICAST; |
2315 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
494fff56 | 2316 | if (c->_c.mfc_flags & MFC_STATIC) |
9a68ac72 ND |
2317 | rtm->rtm_protocol = RTPROT_STATIC; |
2318 | else | |
2319 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2320 | rtm->rtm_flags = 0; |
2321 | ||
930345ea JB |
2322 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
2323 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) | |
f3756b79 | 2324 | goto nla_put_failure; |
7b0db857 | 2325 | err = mr_fill_mroute(mrt, skb, &c->_c, rtm); |
1eb99af5 ND |
2326 | /* do not break the dump if cache is unresolved */ |
2327 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2328 | goto nla_put_failure; |
2329 | ||
053c095a JB |
2330 | nlmsg_end(skb, nlh); |
2331 | return 0; | |
cb6a4e46 PM |
2332 | |
2333 | nla_put_failure: | |
2334 | nlmsg_cancel(skb, nlh); | |
2335 | return -EMSGSIZE; | |
2336 | } | |
2337 | ||
7b0db857 YM |
2338 | static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2339 | u32 portid, u32 seq, struct mr_mfc *c, int cmd, | |
2340 | int flags) | |
2341 | { | |
2342 | return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c, | |
2343 | cmd, flags); | |
2344 | } | |
2345 | ||
8cd3ac9f ND |
2346 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2347 | { | |
2348 | size_t len = | |
2349 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2350 | + nla_total_size(4) /* RTA_TABLE */ | |
2351 | + nla_total_size(4) /* RTA_SRC */ | |
2352 | + nla_total_size(4) /* RTA_DST */ | |
2353 | ; | |
2354 | ||
2355 | if (!unresolved) | |
2356 | len = len | |
2357 | + nla_total_size(4) /* RTA_IIF */ | |
2358 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2359 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2360 | /* RTA_MFC_STATS */ | |
a9a08042 | 2361 | + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) |
8cd3ac9f ND |
2362 | ; |
2363 | ||
2364 | return len; | |
2365 | } | |
2366 | ||
2367 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2368 | int cmd) | |
2369 | { | |
2370 | struct net *net = read_pnet(&mrt->net); | |
2371 | struct sk_buff *skb; | |
2372 | int err = -ENOBUFS; | |
2373 | ||
494fff56 YM |
2374 | skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS, |
2375 | mrt->maxvif), | |
8cd3ac9f | 2376 | GFP_ATOMIC); |
51456b29 | 2377 | if (!skb) |
8cd3ac9f ND |
2378 | goto errout; |
2379 | ||
65886f43 | 2380 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2381 | if (err < 0) |
2382 | goto errout; | |
2383 | ||
2384 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2385 | return; | |
2386 | ||
2387 | errout: | |
2388 | kfree_skb(skb); | |
2389 | if (err < 0) | |
2390 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2391 | } | |
2392 | ||
5a645dd8 JG |
2393 | static size_t igmpmsg_netlink_msgsize(size_t payloadlen) |
2394 | { | |
2395 | size_t len = | |
2396 | NLMSG_ALIGN(sizeof(struct rtgenmsg)) | |
2397 | + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */ | |
2398 | + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */ | |
2399 | + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */ | |
2400 | + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */ | |
2401 | /* IPMRA_CREPORT_PKT */ | |
2402 | + nla_total_size(payloadlen) | |
2403 | ; | |
2404 | ||
2405 | return len; | |
2406 | } | |
2407 | ||
2408 | static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt) | |
2409 | { | |
2410 | struct net *net = read_pnet(&mrt->net); | |
2411 | struct nlmsghdr *nlh; | |
2412 | struct rtgenmsg *rtgenm; | |
2413 | struct igmpmsg *msg; | |
2414 | struct sk_buff *skb; | |
2415 | struct nlattr *nla; | |
2416 | int payloadlen; | |
2417 | ||
2418 | payloadlen = pkt->len - sizeof(struct igmpmsg); | |
2419 | msg = (struct igmpmsg *)skb_network_header(pkt); | |
2420 | ||
2421 | skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC); | |
2422 | if (!skb) | |
2423 | goto errout; | |
2424 | ||
2425 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, | |
2426 | sizeof(struct rtgenmsg), 0); | |
2427 | if (!nlh) | |
2428 | goto errout; | |
2429 | rtgenm = nlmsg_data(nlh); | |
2430 | rtgenm->rtgen_family = RTNL_FAMILY_IPMR; | |
2431 | if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) || | |
2432 | nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) || | |
2433 | nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR, | |
2434 | msg->im_src.s_addr) || | |
2435 | nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR, | |
2436 | msg->im_dst.s_addr)) | |
2437 | goto nla_put_failure; | |
2438 | ||
2439 | nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen); | |
2440 | if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg), | |
2441 | nla_data(nla), payloadlen)) | |
2442 | goto nla_put_failure; | |
2443 | ||
2444 | nlmsg_end(skb, nlh); | |
2445 | ||
2446 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC); | |
2447 | return; | |
2448 | ||
2449 | nla_put_failure: | |
2450 | nlmsg_cancel(skb, nlh); | |
2451 | errout: | |
2452 | kfree_skb(skb); | |
2453 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS); | |
2454 | } | |
2455 | ||
4f75ba69 DS |
2456 | static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
2457 | struct netlink_ext_ack *extack) | |
2458 | { | |
2459 | struct net *net = sock_net(in_skb->sk); | |
2460 | struct nlattr *tb[RTA_MAX + 1]; | |
2461 | struct sk_buff *skb = NULL; | |
2462 | struct mfc_cache *cache; | |
2463 | struct mr_table *mrt; | |
2464 | struct rtmsg *rtm; | |
2465 | __be32 src, grp; | |
2466 | u32 tableid; | |
2467 | int err; | |
2468 | ||
2469 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, | |
2470 | rtm_ipv4_policy, extack); | |
2471 | if (err < 0) | |
2472 | goto errout; | |
2473 | ||
2474 | rtm = nlmsg_data(nlh); | |
2475 | ||
2476 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; | |
2477 | grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
2478 | tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; | |
2479 | ||
2480 | mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT); | |
2e3d232e DC |
2481 | if (!mrt) { |
2482 | err = -ENOENT; | |
4f75ba69 DS |
2483 | goto errout_free; |
2484 | } | |
2485 | ||
2486 | /* entries are added/deleted only under RTNL */ | |
2487 | rcu_read_lock(); | |
2488 | cache = ipmr_cache_find(mrt, src, grp); | |
2489 | rcu_read_unlock(); | |
2490 | if (!cache) { | |
2491 | err = -ENOENT; | |
2492 | goto errout_free; | |
2493 | } | |
2494 | ||
2495 | skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL); | |
2496 | if (!skb) { | |
2497 | err = -ENOBUFS; | |
2498 | goto errout_free; | |
2499 | } | |
2500 | ||
2501 | err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, | |
2502 | nlh->nlmsg_seq, cache, | |
2503 | RTM_NEWROUTE, 0); | |
2504 | if (err < 0) | |
2505 | goto errout_free; | |
2506 | ||
2507 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
2508 | ||
2509 | errout: | |
2510 | return err; | |
2511 | ||
2512 | errout_free: | |
2513 | kfree_skb(skb); | |
2514 | goto errout; | |
2515 | } | |
2516 | ||
cb6a4e46 PM |
2517 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2518 | { | |
7b0db857 YM |
2519 | return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter, |
2520 | _ipmr_fill_mroute, &mfc_unres_lock); | |
cb6a4e46 PM |
2521 | } |
2522 | ||
ccbb0aa6 NA |
2523 | static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = { |
2524 | [RTA_SRC] = { .type = NLA_U32 }, | |
2525 | [RTA_DST] = { .type = NLA_U32 }, | |
2526 | [RTA_IIF] = { .type = NLA_U32 }, | |
2527 | [RTA_TABLE] = { .type = NLA_U32 }, | |
2528 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, | |
2529 | }; | |
2530 | ||
2531 | static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol) | |
2532 | { | |
2533 | switch (rtm_protocol) { | |
2534 | case RTPROT_STATIC: | |
2535 | case RTPROT_MROUTED: | |
2536 | return true; | |
2537 | } | |
2538 | return false; | |
2539 | } | |
2540 | ||
2541 | static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc) | |
2542 | { | |
2543 | struct rtnexthop *rtnh = nla_data(nla); | |
2544 | int remaining = nla_len(nla), vifi = 0; | |
2545 | ||
2546 | while (rtnh_ok(rtnh, remaining)) { | |
2547 | mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops; | |
2548 | if (++vifi == MAXVIFS) | |
2549 | break; | |
2550 | rtnh = rtnh_next(rtnh, &remaining); | |
2551 | } | |
2552 | ||
2553 | return remaining > 0 ? -EINVAL : vifi; | |
2554 | } | |
2555 | ||
2556 | /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */ | |
2557 | static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh, | |
2558 | struct mfcctl *mfcc, int *mrtsock, | |
c21ef3e3 DA |
2559 | struct mr_table **mrtret, |
2560 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2561 | { |
2562 | struct net_device *dev = NULL; | |
2563 | u32 tblid = RT_TABLE_DEFAULT; | |
2564 | struct mr_table *mrt; | |
2565 | struct nlattr *attr; | |
2566 | struct rtmsg *rtm; | |
2567 | int ret, rem; | |
2568 | ||
fceb6435 | 2569 | ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy, |
c21ef3e3 | 2570 | extack); |
ccbb0aa6 NA |
2571 | if (ret < 0) |
2572 | goto out; | |
2573 | rtm = nlmsg_data(nlh); | |
2574 | ||
2575 | ret = -EINVAL; | |
2576 | if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 || | |
2577 | rtm->rtm_type != RTN_MULTICAST || | |
2578 | rtm->rtm_scope != RT_SCOPE_UNIVERSE || | |
2579 | !ipmr_rtm_validate_proto(rtm->rtm_protocol)) | |
2580 | goto out; | |
2581 | ||
2582 | memset(mfcc, 0, sizeof(*mfcc)); | |
2583 | mfcc->mfcc_parent = -1; | |
2584 | ret = 0; | |
2585 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) { | |
2586 | switch (nla_type(attr)) { | |
2587 | case RTA_SRC: | |
2588 | mfcc->mfcc_origin.s_addr = nla_get_be32(attr); | |
2589 | break; | |
2590 | case RTA_DST: | |
2591 | mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr); | |
2592 | break; | |
2593 | case RTA_IIF: | |
2594 | dev = __dev_get_by_index(net, nla_get_u32(attr)); | |
2595 | if (!dev) { | |
2596 | ret = -ENODEV; | |
2597 | goto out; | |
2598 | } | |
2599 | break; | |
2600 | case RTA_MULTIPATH: | |
2601 | if (ipmr_nla_get_ttls(attr, mfcc) < 0) { | |
2602 | ret = -EINVAL; | |
2603 | goto out; | |
2604 | } | |
2605 | break; | |
2606 | case RTA_PREFSRC: | |
2607 | ret = 1; | |
2608 | break; | |
2609 | case RTA_TABLE: | |
2610 | tblid = nla_get_u32(attr); | |
2611 | break; | |
2612 | } | |
2613 | } | |
2614 | mrt = ipmr_get_table(net, tblid); | |
2615 | if (!mrt) { | |
2616 | ret = -ENOENT; | |
2617 | goto out; | |
2618 | } | |
2619 | *mrtret = mrt; | |
2620 | *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0; | |
2621 | if (dev) | |
2622 | mfcc->mfcc_parent = ipmr_find_vif(mrt, dev); | |
2623 | ||
2624 | out: | |
2625 | return ret; | |
2626 | } | |
2627 | ||
2628 | /* takes care of both newroute and delroute */ | |
c21ef3e3 DA |
2629 | static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh, |
2630 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2631 | { |
2632 | struct net *net = sock_net(skb->sk); | |
2633 | int ret, mrtsock, parent; | |
2634 | struct mr_table *tbl; | |
2635 | struct mfcctl mfcc; | |
2636 | ||
2637 | mrtsock = 0; | |
2638 | tbl = NULL; | |
c21ef3e3 | 2639 | ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack); |
ccbb0aa6 NA |
2640 | if (ret < 0) |
2641 | return ret; | |
2642 | ||
2643 | parent = ret ? mfcc.mfcc_parent : -1; | |
2644 | if (nlh->nlmsg_type == RTM_NEWROUTE) | |
2645 | return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent); | |
2646 | else | |
2647 | return ipmr_mfc_delete(tbl, &mfcc, parent); | |
2648 | } | |
2649 | ||
772c344d NA |
2650 | static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb) |
2651 | { | |
2652 | u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len); | |
2653 | ||
2654 | if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) || | |
2655 | nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) || | |
2656 | nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM, | |
2657 | mrt->mroute_reg_vif_num) || | |
2658 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT, | |
2659 | mrt->mroute_do_assert) || | |
2660 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim)) | |
2661 | return false; | |
2662 | ||
2663 | return true; | |
2664 | } | |
2665 | ||
2666 | static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb) | |
2667 | { | |
2668 | struct nlattr *vif_nest; | |
2669 | struct vif_device *vif; | |
2670 | ||
2671 | /* if the VIF doesn't exist just continue */ | |
2672 | if (!VIF_EXISTS(mrt, vifid)) | |
2673 | return true; | |
2674 | ||
2675 | vif = &mrt->vif_table[vifid]; | |
2676 | vif_nest = nla_nest_start(skb, IPMRA_VIF); | |
2677 | if (!vif_nest) | |
2678 | return false; | |
2679 | if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) || | |
2680 | nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) || | |
2681 | nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) || | |
2682 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in, | |
2683 | IPMRA_VIFA_PAD) || | |
2684 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out, | |
2685 | IPMRA_VIFA_PAD) || | |
2686 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in, | |
2687 | IPMRA_VIFA_PAD) || | |
2688 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out, | |
2689 | IPMRA_VIFA_PAD) || | |
2690 | nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) || | |
2691 | nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) { | |
2692 | nla_nest_cancel(skb, vif_nest); | |
2693 | return false; | |
2694 | } | |
2695 | nla_nest_end(skb, vif_nest); | |
2696 | ||
2697 | return true; | |
2698 | } | |
2699 | ||
2700 | static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb) | |
2701 | { | |
2702 | struct net *net = sock_net(skb->sk); | |
2703 | struct nlmsghdr *nlh = NULL; | |
2704 | unsigned int t = 0, s_t; | |
2705 | unsigned int e = 0, s_e; | |
2706 | struct mr_table *mrt; | |
2707 | ||
2708 | s_t = cb->args[0]; | |
2709 | s_e = cb->args[1]; | |
2710 | ||
2711 | ipmr_for_each_table(mrt, net) { | |
2712 | struct nlattr *vifs, *af; | |
2713 | struct ifinfomsg *hdr; | |
2714 | u32 i; | |
2715 | ||
2716 | if (t < s_t) | |
2717 | goto skip_table; | |
2718 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
2719 | cb->nlh->nlmsg_seq, RTM_NEWLINK, | |
2720 | sizeof(*hdr), NLM_F_MULTI); | |
2721 | if (!nlh) | |
2722 | break; | |
2723 | ||
2724 | hdr = nlmsg_data(nlh); | |
2725 | memset(hdr, 0, sizeof(*hdr)); | |
2726 | hdr->ifi_family = RTNL_FAMILY_IPMR; | |
2727 | ||
2728 | af = nla_nest_start(skb, IFLA_AF_SPEC); | |
2729 | if (!af) { | |
2730 | nlmsg_cancel(skb, nlh); | |
2731 | goto out; | |
2732 | } | |
2733 | ||
2734 | if (!ipmr_fill_table(mrt, skb)) { | |
2735 | nlmsg_cancel(skb, nlh); | |
2736 | goto out; | |
2737 | } | |
2738 | ||
2739 | vifs = nla_nest_start(skb, IPMRA_TABLE_VIFS); | |
2740 | if (!vifs) { | |
2741 | nla_nest_end(skb, af); | |
2742 | nlmsg_end(skb, nlh); | |
2743 | goto out; | |
2744 | } | |
2745 | for (i = 0; i < mrt->maxvif; i++) { | |
2746 | if (e < s_e) | |
2747 | goto skip_entry; | |
2748 | if (!ipmr_fill_vif(mrt, i, skb)) { | |
2749 | nla_nest_end(skb, vifs); | |
2750 | nla_nest_end(skb, af); | |
2751 | nlmsg_end(skb, nlh); | |
2752 | goto out; | |
2753 | } | |
2754 | skip_entry: | |
2755 | e++; | |
2756 | } | |
2757 | s_e = 0; | |
2758 | e = 0; | |
2759 | nla_nest_end(skb, vifs); | |
2760 | nla_nest_end(skb, af); | |
2761 | nlmsg_end(skb, nlh); | |
2762 | skip_table: | |
2763 | t++; | |
2764 | } | |
2765 | ||
2766 | out: | |
2767 | cb->args[1] = e; | |
2768 | cb->args[0] = t; | |
2769 | ||
2770 | return skb->len; | |
2771 | } | |
2772 | ||
e905a9ed | 2773 | #ifdef CONFIG_PROC_FS |
7ef8f65d NA |
2774 | /* The /proc interfaces to multicast routing : |
2775 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 | 2776 | */ |
1da177e4 LT |
2777 | |
2778 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2779 | __acquires(mrt_lock) |
1da177e4 | 2780 | { |
3feda6b4 | 2781 | struct mr_vif_iter *iter = seq->private; |
f6bb4514 | 2782 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2783 | struct mr_table *mrt; |
2784 | ||
2785 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 2786 | if (!mrt) |
f0ad0860 PM |
2787 | return ERR_PTR(-ENOENT); |
2788 | ||
2789 | iter->mrt = mrt; | |
f6bb4514 | 2790 | |
1da177e4 | 2791 | read_lock(&mrt_lock); |
3feda6b4 | 2792 | return mr_vif_seq_start(seq, pos); |
1da177e4 LT |
2793 | } |
2794 | ||
2795 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2796 | __releases(mrt_lock) |
1da177e4 LT |
2797 | { |
2798 | read_unlock(&mrt_lock); | |
2799 | } | |
2800 | ||
2801 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2802 | { | |
3feda6b4 | 2803 | struct mr_vif_iter *iter = seq->private; |
f0ad0860 | 2804 | struct mr_table *mrt = iter->mrt; |
f6bb4514 | 2805 | |
1da177e4 | 2806 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2807 | seq_puts(seq, |
1da177e4 LT |
2808 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2809 | } else { | |
2810 | const struct vif_device *vif = v; | |
6853f21f YM |
2811 | const char *name = vif->dev ? |
2812 | vif->dev->name : "none"; | |
1da177e4 LT |
2813 | |
2814 | seq_printf(seq, | |
91e6dd82 | 2815 | "%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
0c12295a | 2816 | vif - mrt->vif_table, |
e905a9ed | 2817 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2818 | vif->bytes_out, vif->pkt_out, |
2819 | vif->flags, vif->local, vif->remote); | |
2820 | } | |
2821 | return 0; | |
2822 | } | |
2823 | ||
f690808e | 2824 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 | 2825 | .start = ipmr_vif_seq_start, |
3feda6b4 | 2826 | .next = mr_vif_seq_next, |
1da177e4 LT |
2827 | .stop = ipmr_vif_seq_stop, |
2828 | .show = ipmr_vif_seq_show, | |
2829 | }; | |
2830 | ||
2831 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2832 | { | |
f6bb4514 | 2833 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
3feda6b4 | 2834 | sizeof(struct mr_vif_iter)); |
1da177e4 LT |
2835 | } |
2836 | ||
9a32144e | 2837 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2838 | .open = ipmr_vif_open, |
2839 | .read = seq_read, | |
2840 | .llseek = seq_lseek, | |
f6bb4514 | 2841 | .release = seq_release_net, |
1da177e4 LT |
2842 | }; |
2843 | ||
1da177e4 LT |
2844 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
2845 | { | |
f6bb4514 | 2846 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2847 | struct mr_table *mrt; |
f6bb4514 | 2848 | |
f0ad0860 | 2849 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2850 | if (!mrt) |
f0ad0860 | 2851 | return ERR_PTR(-ENOENT); |
f6bb4514 | 2852 | |
c8d61968 | 2853 | return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock); |
1da177e4 LT |
2854 | } |
2855 | ||
2856 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2857 | { | |
2858 | int n; | |
2859 | ||
2860 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2861 | seq_puts(seq, |
1da177e4 LT |
2862 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2863 | } else { | |
2864 | const struct mfc_cache *mfc = v; | |
c8d61968 | 2865 | const struct mr_mfc_iter *it = seq->private; |
f0ad0860 | 2866 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2867 | |
0eae88f3 ED |
2868 | seq_printf(seq, "%08X %08X %-3hd", |
2869 | (__force u32) mfc->mfc_mcastgrp, | |
2870 | (__force u32) mfc->mfc_origin, | |
494fff56 | 2871 | mfc->_c.mfc_parent); |
1da177e4 | 2872 | |
0c12295a | 2873 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 | 2874 | seq_printf(seq, " %8lu %8lu %8lu", |
494fff56 YM |
2875 | mfc->_c.mfc_un.res.pkt, |
2876 | mfc->_c.mfc_un.res.bytes, | |
2877 | mfc->_c.mfc_un.res.wrong_if); | |
2878 | for (n = mfc->_c.mfc_un.res.minvif; | |
2879 | n < mfc->_c.mfc_un.res.maxvif; n++) { | |
0c12295a | 2880 | if (VIF_EXISTS(mrt, n) && |
494fff56 | 2881 | mfc->_c.mfc_un.res.ttls[n] < 255) |
cf958ae3 | 2882 | seq_printf(seq, |
e905a9ed | 2883 | " %2d:%-3d", |
494fff56 | 2884 | n, mfc->_c.mfc_un.res.ttls[n]); |
1da177e4 | 2885 | } |
1ea472e2 BT |
2886 | } else { |
2887 | /* unresolved mfc_caches don't contain | |
2888 | * pkt, bytes and wrong_if values | |
2889 | */ | |
2890 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2891 | } |
2892 | seq_putc(seq, '\n'); | |
2893 | } | |
2894 | return 0; | |
2895 | } | |
2896 | ||
f690808e | 2897 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 | 2898 | .start = ipmr_mfc_seq_start, |
c8d61968 YM |
2899 | .next = mr_mfc_seq_next, |
2900 | .stop = mr_mfc_seq_stop, | |
1da177e4 LT |
2901 | .show = ipmr_mfc_seq_show, |
2902 | }; | |
2903 | ||
2904 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2905 | { | |
f6bb4514 | 2906 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
c8d61968 | 2907 | sizeof(struct mr_mfc_iter)); |
1da177e4 LT |
2908 | } |
2909 | ||
9a32144e | 2910 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2911 | .open = ipmr_mfc_open, |
2912 | .read = seq_read, | |
2913 | .llseek = seq_lseek, | |
f6bb4514 | 2914 | .release = seq_release_net, |
1da177e4 | 2915 | }; |
e905a9ed | 2916 | #endif |
1da177e4 LT |
2917 | |
2918 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2919 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2920 | .handler = pim_rcv, |
403dbb97 | 2921 | .netns_ok = 1, |
1da177e4 LT |
2922 | }; |
2923 | #endif | |
2924 | ||
4d65b948 YG |
2925 | static unsigned int ipmr_seq_read(struct net *net) |
2926 | { | |
2927 | ASSERT_RTNL(); | |
2928 | ||
2929 | return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net); | |
2930 | } | |
2931 | ||
2932 | static int ipmr_dump(struct net *net, struct notifier_block *nb) | |
2933 | { | |
cdc9f944 YM |
2934 | return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump, |
2935 | ipmr_mr_table_iter, &mrt_lock); | |
4d65b948 YG |
2936 | } |
2937 | ||
2938 | static const struct fib_notifier_ops ipmr_notifier_ops_template = { | |
2939 | .family = RTNL_FAMILY_IPMR, | |
2940 | .fib_seq_read = ipmr_seq_read, | |
2941 | .fib_dump = ipmr_dump, | |
2942 | .owner = THIS_MODULE, | |
2943 | }; | |
2944 | ||
ef739d8a | 2945 | static int __net_init ipmr_notifier_init(struct net *net) |
4d65b948 YG |
2946 | { |
2947 | struct fib_notifier_ops *ops; | |
2948 | ||
2949 | net->ipv4.ipmr_seq = 0; | |
2950 | ||
2951 | ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net); | |
2952 | if (IS_ERR(ops)) | |
2953 | return PTR_ERR(ops); | |
2954 | net->ipv4.ipmr_notifier_ops = ops; | |
2955 | ||
2956 | return 0; | |
2957 | } | |
2958 | ||
2959 | static void __net_exit ipmr_notifier_exit(struct net *net) | |
2960 | { | |
2961 | fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops); | |
2962 | net->ipv4.ipmr_notifier_ops = NULL; | |
2963 | } | |
2964 | ||
7ef8f65d | 2965 | /* Setup for IP multicast routing */ |
cf958ae3 BT |
2966 | static int __net_init ipmr_net_init(struct net *net) |
2967 | { | |
f0ad0860 | 2968 | int err; |
cf958ae3 | 2969 | |
4d65b948 YG |
2970 | err = ipmr_notifier_init(net); |
2971 | if (err) | |
2972 | goto ipmr_notifier_fail; | |
2973 | ||
f0ad0860 PM |
2974 | err = ipmr_rules_init(net); |
2975 | if (err < 0) | |
4d65b948 | 2976 | goto ipmr_rules_fail; |
f6bb4514 BT |
2977 | |
2978 | #ifdef CONFIG_PROC_FS | |
2979 | err = -ENOMEM; | |
d4beaa66 | 2980 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 2981 | goto proc_vif_fail; |
d4beaa66 | 2982 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
2983 | goto proc_cache_fail; |
2984 | #endif | |
2bb8b26c BT |
2985 | return 0; |
2986 | ||
f6bb4514 BT |
2987 | #ifdef CONFIG_PROC_FS |
2988 | proc_cache_fail: | |
ece31ffd | 2989 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 2990 | proc_vif_fail: |
f0ad0860 | 2991 | ipmr_rules_exit(net); |
f6bb4514 | 2992 | #endif |
4d65b948 YG |
2993 | ipmr_rules_fail: |
2994 | ipmr_notifier_exit(net); | |
2995 | ipmr_notifier_fail: | |
cf958ae3 BT |
2996 | return err; |
2997 | } | |
2998 | ||
2999 | static void __net_exit ipmr_net_exit(struct net *net) | |
3000 | { | |
f6bb4514 | 3001 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
3002 | remove_proc_entry("ip_mr_cache", net->proc_net); |
3003 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 3004 | #endif |
4d65b948 | 3005 | ipmr_notifier_exit(net); |
f0ad0860 | 3006 | ipmr_rules_exit(net); |
cf958ae3 BT |
3007 | } |
3008 | ||
3009 | static struct pernet_operations ipmr_net_ops = { | |
3010 | .init = ipmr_net_init, | |
3011 | .exit = ipmr_net_exit, | |
3012 | }; | |
e905a9ed | 3013 | |
03d2f897 | 3014 | int __init ip_mr_init(void) |
1da177e4 | 3015 | { |
03d2f897 WC |
3016 | int err; |
3017 | ||
1da177e4 LT |
3018 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
3019 | sizeof(struct mfc_cache), | |
a8c9486b | 3020 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 3021 | NULL); |
03d2f897 | 3022 | |
cf958ae3 BT |
3023 | err = register_pernet_subsys(&ipmr_net_ops); |
3024 | if (err) | |
3025 | goto reg_pernet_fail; | |
3026 | ||
03d2f897 WC |
3027 | err = register_netdevice_notifier(&ip_mr_notifier); |
3028 | if (err) | |
3029 | goto reg_notif_fail; | |
403dbb97 TG |
3030 | #ifdef CONFIG_IP_PIMSM_V2 |
3031 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 3032 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
3033 | err = -EAGAIN; |
3034 | goto add_proto_fail; | |
3035 | } | |
3036 | #endif | |
c7ac8679 | 3037 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
b97bac64 | 3038 | ipmr_rtm_getroute, ipmr_rtm_dumproute, 0); |
ccbb0aa6 | 3039 | rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, |
b97bac64 | 3040 | ipmr_rtm_route, NULL, 0); |
ccbb0aa6 | 3041 | rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, |
b97bac64 | 3042 | ipmr_rtm_route, NULL, 0); |
772c344d NA |
3043 | |
3044 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK, | |
b97bac64 | 3045 | NULL, ipmr_rtm_dumplink, 0); |
03d2f897 | 3046 | return 0; |
f6bb4514 | 3047 | |
403dbb97 TG |
3048 | #ifdef CONFIG_IP_PIMSM_V2 |
3049 | add_proto_fail: | |
3050 | unregister_netdevice_notifier(&ip_mr_notifier); | |
3051 | #endif | |
c3e38896 | 3052 | reg_notif_fail: |
cf958ae3 BT |
3053 | unregister_pernet_subsys(&ipmr_net_ops); |
3054 | reg_pernet_fail: | |
c3e38896 | 3055 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 3056 | return err; |
1da177e4 | 3057 | } |