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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * IP multicast routing support for mrouted 3.6/3.8 | |
4 | * | |
113aa838 | 5 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
6 | * Linux Consultancy and Custom Driver Development |
7 | * | |
1da177e4 LT |
8 | * Fixes: |
9 | * Michael Chastain : Incorrect size of copying. | |
10 | * Alan Cox : Added the cache manager code | |
11 | * Alan Cox : Fixed the clone/copy bug and device race. | |
12 | * Mike McLagan : Routing by source | |
13 | * Malcolm Beattie : Buffer handling fixes. | |
14 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
15 | * SVR Anand : Fixed several multicast bugs and problems. | |
16 | * Alexey Kuznetsov : Status, optimisations and more. | |
17 | * Brad Parker : Better behaviour on mrouted upcall | |
18 | * overflow. | |
19 | * Carlos Picoto : PIMv1 Support | |
20 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
f77f13e2 | 21 | * Relax this requirement to work with older peers. |
1da177e4 LT |
22 | */ |
23 | ||
7c0f6ba6 | 24 | #include <linux/uaccess.h> |
1da177e4 | 25 | #include <linux/types.h> |
08009a76 | 26 | #include <linux/cache.h> |
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 | 28 | #include <linux/errno.h> |
1da177e4 LT |
29 | #include <linux/mm.h> |
30 | #include <linux/kernel.h> | |
31 | #include <linux/fcntl.h> | |
32 | #include <linux/stat.h> | |
33 | #include <linux/socket.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/inet.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/inetdevice.h> | |
38 | #include <linux/igmp.h> | |
39 | #include <linux/proc_fs.h> | |
40 | #include <linux/seq_file.h> | |
41 | #include <linux/mroute.h> | |
42 | #include <linux/init.h> | |
46f25dff | 43 | #include <linux/if_ether.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/ip.h> |
47 | #include <net/protocol.h> | |
48 | #include <linux/skbuff.h> | |
14c85021 | 49 | #include <net/route.h> |
1da177e4 LT |
50 | #include <net/icmp.h> |
51 | #include <net/udp.h> | |
52 | #include <net/raw.h> | |
53 | #include <linux/notifier.h> | |
54 | #include <linux/if_arp.h> | |
55 | #include <linux/netfilter_ipv4.h> | |
709b46e8 | 56 | #include <linux/compat.h> |
bc3b2d7f | 57 | #include <linux/export.h> |
0eb71a9d | 58 | #include <linux/rhashtable.h> |
c5441932 | 59 | #include <net/ip_tunnels.h> |
1da177e4 | 60 | #include <net/checksum.h> |
dc5fc579 | 61 | #include <net/netlink.h> |
f0ad0860 | 62 | #include <net/fib_rules.h> |
d67b8c61 | 63 | #include <linux/netconf.h> |
3c618c1d | 64 | #include <net/rtnh.h> |
1da177e4 | 65 | |
5648451e GS |
66 | #include <linux/nospec.h> |
67 | ||
f0ad0860 PM |
68 | struct ipmr_rule { |
69 | struct fib_rule common; | |
70 | }; | |
71 | ||
72 | struct ipmr_result { | |
73 | struct mr_table *mrt; | |
74 | }; | |
75 | ||
1da177e4 | 76 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 77 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
78 | */ |
79 | ||
80 | static DEFINE_RWLOCK(mrt_lock); | |
81 | ||
7ef8f65d | 82 | /* Multicast router control variables */ |
1da177e4 | 83 | |
1da177e4 LT |
84 | /* Special spinlock for queue of unresolved entries */ |
85 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
86 | ||
87 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
88 | * entries is changed only in process context and protected |
89 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
90 | * with strong spinlock mfc_unres_lock. | |
91 | * | |
92 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
93 | */ |
94 | ||
08009a76 | 95 | static struct kmem_cache *mrt_cachep __ro_after_init; |
1da177e4 | 96 | |
f0ad0860 | 97 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
98 | static void ipmr_free_table(struct mr_table *mrt); |
99 | ||
c4854ec8 | 100 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 DS |
101 | struct net_device *dev, struct sk_buff *skb, |
102 | struct mfc_cache *cache, int local); | |
0c12295a | 103 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 104 | struct sk_buff *pkt, vifi_t vifi, int assert); |
8cd3ac9f ND |
105 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
106 | int cmd); | |
5a645dd8 | 107 | static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt); |
ca8d4794 | 108 | static void mroute_clean_tables(struct mr_table *mrt, int flags); |
e99e88a9 | 109 | static void ipmr_expire_process(struct timer_list *t); |
f0ad0860 PM |
110 | |
111 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
112 | #define ipmr_for_each_table(mrt, net) \ | |
113 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
114 | ||
7b0db857 YM |
115 | static struct mr_table *ipmr_mr_table_iter(struct net *net, |
116 | struct mr_table *mrt) | |
117 | { | |
118 | struct mr_table *ret; | |
119 | ||
120 | if (!mrt) | |
121 | ret = list_entry_rcu(net->ipv4.mr_tables.next, | |
122 | struct mr_table, list); | |
123 | else | |
124 | ret = list_entry_rcu(mrt->list.next, | |
125 | struct mr_table, list); | |
126 | ||
127 | if (&ret->list == &net->ipv4.mr_tables) | |
128 | return NULL; | |
129 | return ret; | |
130 | } | |
131 | ||
f0ad0860 PM |
132 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
133 | { | |
134 | struct mr_table *mrt; | |
135 | ||
136 | ipmr_for_each_table(mrt, net) { | |
137 | if (mrt->id == id) | |
138 | return mrt; | |
139 | } | |
140 | return NULL; | |
141 | } | |
142 | ||
da91981b | 143 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
144 | struct mr_table **mrt) |
145 | { | |
f0ad0860 | 146 | int err; |
95f4a45d HFS |
147 | struct ipmr_result res; |
148 | struct fib_lookup_arg arg = { | |
149 | .result = &res, | |
150 | .flags = FIB_LOOKUP_NOREF, | |
151 | }; | |
f0ad0860 | 152 | |
e58e4159 DA |
153 | /* update flow if oif or iif point to device enslaved to l3mdev */ |
154 | l3mdev_update_flow(net, flowi4_to_flowi(flp4)); | |
155 | ||
da91981b DM |
156 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
157 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
158 | if (err < 0) |
159 | return err; | |
160 | *mrt = res.mrt; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
165 | int flags, struct fib_lookup_arg *arg) | |
166 | { | |
167 | struct ipmr_result *res = arg->result; | |
168 | struct mr_table *mrt; | |
1da177e4 | 169 | |
f0ad0860 PM |
170 | switch (rule->action) { |
171 | case FR_ACT_TO_TBL: | |
172 | break; | |
173 | case FR_ACT_UNREACHABLE: | |
174 | return -ENETUNREACH; | |
175 | case FR_ACT_PROHIBIT: | |
176 | return -EACCES; | |
177 | case FR_ACT_BLACKHOLE: | |
178 | default: | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
e58e4159 DA |
182 | arg->table = fib_rule_get_table(rule, arg); |
183 | ||
184 | mrt = ipmr_get_table(rule->fr_net, arg->table); | |
51456b29 | 185 | if (!mrt) |
f0ad0860 PM |
186 | return -EAGAIN; |
187 | res->mrt = mrt; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
192 | { | |
193 | return 1; | |
194 | } | |
195 | ||
196 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
197 | FRA_GENERIC_POLICY, | |
198 | }; | |
199 | ||
200 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
b16fb418 RP |
201 | struct fib_rule_hdr *frh, struct nlattr **tb, |
202 | struct netlink_ext_ack *extack) | |
f0ad0860 PM |
203 | { |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
208 | struct nlattr **tb) | |
209 | { | |
210 | return 1; | |
211 | } | |
212 | ||
213 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
214 | struct fib_rule_hdr *frh) | |
215 | { | |
216 | frh->dst_len = 0; | |
217 | frh->src_len = 0; | |
218 | frh->tos = 0; | |
219 | return 0; | |
220 | } | |
221 | ||
04a6f82c | 222 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 223 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
224 | .rule_size = sizeof(struct ipmr_rule), |
225 | .addr_size = sizeof(u32), | |
226 | .action = ipmr_rule_action, | |
227 | .match = ipmr_rule_match, | |
228 | .configure = ipmr_rule_configure, | |
229 | .compare = ipmr_rule_compare, | |
f0ad0860 PM |
230 | .fill = ipmr_rule_fill, |
231 | .nlgroup = RTNLGRP_IPV4_RULE, | |
232 | .policy = ipmr_rule_policy, | |
233 | .owner = THIS_MODULE, | |
234 | }; | |
235 | ||
236 | static int __net_init ipmr_rules_init(struct net *net) | |
237 | { | |
238 | struct fib_rules_ops *ops; | |
239 | struct mr_table *mrt; | |
240 | int err; | |
241 | ||
242 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
243 | if (IS_ERR(ops)) | |
244 | return PTR_ERR(ops); | |
245 | ||
246 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
247 | ||
248 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
1113ebbc NA |
249 | if (IS_ERR(mrt)) { |
250 | err = PTR_ERR(mrt); | |
f0ad0860 PM |
251 | goto err1; |
252 | } | |
253 | ||
254 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
255 | if (err < 0) | |
256 | goto err2; | |
257 | ||
258 | net->ipv4.mr_rules_ops = ops; | |
259 | return 0; | |
260 | ||
261 | err2: | |
f243e5a7 | 262 | ipmr_free_table(mrt); |
f0ad0860 PM |
263 | err1: |
264 | fib_rules_unregister(ops); | |
265 | return err; | |
266 | } | |
267 | ||
268 | static void __net_exit ipmr_rules_exit(struct net *net) | |
269 | { | |
270 | struct mr_table *mrt, *next; | |
271 | ||
ed785309 | 272 | rtnl_lock(); |
035320d5 ED |
273 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
274 | list_del(&mrt->list); | |
acbb219d | 275 | ipmr_free_table(mrt); |
035320d5 | 276 | } |
f0ad0860 | 277 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
419df12f | 278 | rtnl_unlock(); |
f0ad0860 | 279 | } |
4d65b948 | 280 | |
b7a59557 JP |
281 | static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, |
282 | struct netlink_ext_ack *extack) | |
4d65b948 | 283 | { |
b7a59557 | 284 | return fib_rules_dump(net, nb, RTNL_FAMILY_IPMR, extack); |
4d65b948 YG |
285 | } |
286 | ||
287 | static unsigned int ipmr_rules_seq_read(struct net *net) | |
288 | { | |
289 | return fib_rules_seq_read(net, RTNL_FAMILY_IPMR); | |
290 | } | |
478e4c2f YG |
291 | |
292 | bool ipmr_rule_default(const struct fib_rule *rule) | |
293 | { | |
294 | return fib_rule_matchall(rule) && rule->table == RT_TABLE_DEFAULT; | |
295 | } | |
296 | EXPORT_SYMBOL(ipmr_rule_default); | |
f0ad0860 PM |
297 | #else |
298 | #define ipmr_for_each_table(mrt, net) \ | |
299 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
300 | ||
7b0db857 YM |
301 | static struct mr_table *ipmr_mr_table_iter(struct net *net, |
302 | struct mr_table *mrt) | |
303 | { | |
304 | if (!mrt) | |
305 | return net->ipv4.mrt; | |
306 | return NULL; | |
307 | } | |
308 | ||
f0ad0860 PM |
309 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) |
310 | { | |
311 | return net->ipv4.mrt; | |
312 | } | |
313 | ||
da91981b | 314 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
315 | struct mr_table **mrt) |
316 | { | |
317 | *mrt = net->ipv4.mrt; | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static int __net_init ipmr_rules_init(struct net *net) | |
322 | { | |
1113ebbc NA |
323 | struct mr_table *mrt; |
324 | ||
325 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
326 | if (IS_ERR(mrt)) | |
327 | return PTR_ERR(mrt); | |
328 | net->ipv4.mrt = mrt; | |
329 | return 0; | |
f0ad0860 PM |
330 | } |
331 | ||
332 | static void __net_exit ipmr_rules_exit(struct net *net) | |
333 | { | |
ed785309 | 334 | rtnl_lock(); |
acbb219d | 335 | ipmr_free_table(net->ipv4.mrt); |
ed785309 WC |
336 | net->ipv4.mrt = NULL; |
337 | rtnl_unlock(); | |
f0ad0860 | 338 | } |
4d65b948 | 339 | |
b7a59557 JP |
340 | static int ipmr_rules_dump(struct net *net, struct notifier_block *nb, |
341 | struct netlink_ext_ack *extack) | |
4d65b948 YG |
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, | |
8fb472c0 NA |
373 | .obj_cmpfn = ipmr_hash_cmp, |
374 | .automatic_shrinking = true, | |
375 | }; | |
376 | ||
0bbbf0e7 YM |
377 | static void ipmr_new_table_set(struct mr_table *mrt, |
378 | struct net *net) | |
379 | { | |
380 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
381 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
382 | #endif | |
383 | } | |
384 | ||
845c9a7a YM |
385 | static struct mfc_cache_cmp_arg ipmr_mr_table_ops_cmparg_any = { |
386 | .mfc_mcastgrp = htonl(INADDR_ANY), | |
387 | .mfc_origin = htonl(INADDR_ANY), | |
388 | }; | |
389 | ||
390 | static struct mr_table_ops ipmr_mr_table_ops = { | |
391 | .rht_params = &ipmr_rht_params, | |
392 | .cmparg_any = &ipmr_mr_table_ops_cmparg_any, | |
393 | }; | |
394 | ||
f0ad0860 PM |
395 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) |
396 | { | |
397 | struct mr_table *mrt; | |
1da177e4 | 398 | |
1113ebbc NA |
399 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
400 | if (id != RT_TABLE_DEFAULT && id >= 1000000000) | |
401 | return ERR_PTR(-EINVAL); | |
402 | ||
f0ad0860 | 403 | mrt = ipmr_get_table(net, id); |
00db4124 | 404 | if (mrt) |
f0ad0860 PM |
405 | return mrt; |
406 | ||
845c9a7a | 407 | return mr_table_alloc(net, id, &ipmr_mr_table_ops, |
0bbbf0e7 | 408 | ipmr_expire_process, ipmr_new_table_set); |
f0ad0860 | 409 | } |
1da177e4 | 410 | |
acbb219d FR |
411 | static void ipmr_free_table(struct mr_table *mrt) |
412 | { | |
413 | del_timer_sync(&mrt->ipmr_expire_timer); | |
ca8d4794 CS |
414 | mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC | |
415 | MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC); | |
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; |
00f54e68 | 507 | if (dev_open(dev, NULL)) |
1da177e4 | 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; |
00f54e68 | 590 | if (dev_open(dev, NULL)) |
1da177e4 LT |
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 | 835 | { |
bccb3025 | 836 | struct netdev_phys_item_id ppid = { }; |
1da177e4 | 837 | int vifi = vifc->vifc_vifi; |
0c12295a | 838 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
839 | struct net_device *dev; |
840 | struct in_device *in_dev; | |
d607032d | 841 | int err; |
1da177e4 LT |
842 | |
843 | /* Is vif busy ? */ | |
0c12295a | 844 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
845 | return -EADDRINUSE; |
846 | ||
847 | switch (vifc->vifc_flags) { | |
1da177e4 | 848 | case VIFF_REGISTER: |
1973a4ea | 849 | if (!ipmr_pimsm_enabled()) |
c316c629 NA |
850 | return -EINVAL; |
851 | /* Special Purpose VIF in PIM | |
1da177e4 LT |
852 | * All the packets will be sent to the daemon |
853 | */ | |
0c12295a | 854 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 855 | return -EADDRINUSE; |
f0ad0860 | 856 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
857 | if (!dev) |
858 | return -ENOBUFS; | |
d607032d WC |
859 | err = dev_set_allmulti(dev, 1); |
860 | if (err) { | |
861 | unregister_netdevice(dev); | |
7dc00c82 | 862 | dev_put(dev); |
d607032d WC |
863 | return err; |
864 | } | |
1da177e4 | 865 | break; |
e905a9ed | 866 | case VIFF_TUNNEL: |
4feb88e5 | 867 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
868 | if (!dev) |
869 | return -ENOBUFS; | |
d607032d WC |
870 | err = dev_set_allmulti(dev, 1); |
871 | if (err) { | |
872 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 873 | dev_put(dev); |
d607032d WC |
874 | return err; |
875 | } | |
1da177e4 | 876 | break; |
ee5e81f0 | 877 | case VIFF_USE_IFINDEX: |
1da177e4 | 878 | case 0: |
ee5e81f0 I |
879 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
880 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
51456b29 | 881 | if (dev && !__in_dev_get_rtnl(dev)) { |
ee5e81f0 I |
882 | dev_put(dev); |
883 | return -EADDRNOTAVAIL; | |
884 | } | |
a8cb16dd | 885 | } else { |
ee5e81f0 | 886 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 887 | } |
1da177e4 LT |
888 | if (!dev) |
889 | return -EADDRNOTAVAIL; | |
d607032d | 890 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
891 | if (err) { |
892 | dev_put(dev); | |
d607032d | 893 | return err; |
7dc00c82 | 894 | } |
1da177e4 LT |
895 | break; |
896 | default: | |
897 | return -EINVAL; | |
898 | } | |
899 | ||
a8cb16dd ED |
900 | in_dev = __in_dev_get_rtnl(dev); |
901 | if (!in_dev) { | |
d0490cfd | 902 | dev_put(dev); |
1da177e4 | 903 | return -EADDRNOTAVAIL; |
d0490cfd | 904 | } |
42f811b8 | 905 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
3b022865 DA |
906 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING, |
907 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
908 | ip_rt_multicast_event(in_dev); |
909 | ||
a8cb16dd | 910 | /* Fill in the VIF structures */ |
6853f21f YM |
911 | vif_device_init(v, dev, vifc->vifc_rate_limit, |
912 | vifc->vifc_threshold, | |
913 | vifc->vifc_flags | (!mrtsock ? VIFF_STATIC : 0), | |
914 | (VIFF_TUNNEL | VIFF_REGISTER)); | |
a8cb16dd | 915 | |
bccb3025 FF |
916 | err = dev_get_port_parent_id(dev, &ppid, true); |
917 | if (err == 0) { | |
918 | memcpy(v->dev_parent_id.id, ppid.id, ppid.id_len); | |
919 | v->dev_parent_id.id_len = ppid.id_len; | |
5d8b3e69 YG |
920 | } else { |
921 | v->dev_parent_id.id_len = 0; | |
922 | } | |
6853f21f | 923 | |
c354e124 JK |
924 | v->local = vifc->vifc_lcl_addr.s_addr; |
925 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
1da177e4 LT |
926 | |
927 | /* And finish update writing critical data */ | |
928 | write_lock_bh(&mrt_lock); | |
c354e124 | 929 | v->dev = dev; |
a8cb16dd | 930 | if (v->flags & VIFF_REGISTER) |
0c12295a | 931 | mrt->mroute_reg_vif_num = vifi; |
0c12295a PM |
932 | if (vifi+1 > mrt->maxvif) |
933 | mrt->maxvif = vifi+1; | |
1da177e4 | 934 | write_unlock_bh(&mrt_lock); |
b362053a | 935 | call_ipmr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, v, vifi, mrt->id); |
1da177e4 LT |
936 | return 0; |
937 | } | |
938 | ||
a8c9486b | 939 | /* called with rcu_read_lock() */ |
0c12295a | 940 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
941 | __be32 origin, |
942 | __be32 mcastgrp) | |
1da177e4 | 943 | { |
8fb472c0 NA |
944 | struct mfc_cache_cmp_arg arg = { |
945 | .mfc_mcastgrp = mcastgrp, | |
946 | .mfc_origin = origin | |
947 | }; | |
660b26dc | 948 | |
845c9a7a | 949 | return mr_mfc_find(mrt, &arg); |
660b26dc ND |
950 | } |
951 | ||
952 | /* Look for a (*,G) entry */ | |
953 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
954 | __be32 mcastgrp, int vifi) | |
955 | { | |
8fb472c0 NA |
956 | struct mfc_cache_cmp_arg arg = { |
957 | .mfc_mcastgrp = mcastgrp, | |
958 | .mfc_origin = htonl(INADDR_ANY) | |
959 | }; | |
660b26dc | 960 | |
360eb5da | 961 | if (mcastgrp == htonl(INADDR_ANY)) |
845c9a7a YM |
962 | return mr_mfc_find_any_parent(mrt, vifi); |
963 | return mr_mfc_find_any(mrt, vifi, &arg); | |
660b26dc ND |
964 | } |
965 | ||
8fb472c0 NA |
966 | /* Look for a (S,G,iif) entry if parent != -1 */ |
967 | static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt, | |
968 | __be32 origin, __be32 mcastgrp, | |
969 | int parent) | |
970 | { | |
971 | struct mfc_cache_cmp_arg arg = { | |
972 | .mfc_mcastgrp = mcastgrp, | |
973 | .mfc_origin = origin, | |
974 | }; | |
8fb472c0 | 975 | |
845c9a7a | 976 | return mr_mfc_find_parent(mrt, &arg, parent); |
8fb472c0 NA |
977 | } |
978 | ||
7ef8f65d | 979 | /* Allocate a multicast cache entry */ |
d658f8a0 | 980 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 981 | { |
c354e124 | 982 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b | 983 | |
70a0dec4 | 984 | if (c) { |
494fff56 YM |
985 | c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; |
986 | c->_c.mfc_un.res.minvif = MAXVIFS; | |
8c13af2a | 987 | c->_c.free = ipmr_cache_free_rcu; |
494fff56 | 988 | refcount_set(&c->_c.mfc_un.res.refcount, 1); |
70a0dec4 | 989 | } |
1da177e4 LT |
990 | return c; |
991 | } | |
992 | ||
d658f8a0 | 993 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 994 | { |
c354e124 | 995 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
996 | |
997 | if (c) { | |
494fff56 YM |
998 | skb_queue_head_init(&c->_c.mfc_un.unres.unresolved); |
999 | c->_c.mfc_un.unres.expires = jiffies + 10 * HZ; | |
a8c9486b | 1000 | } |
1da177e4 LT |
1001 | return c; |
1002 | } | |
1003 | ||
7ef8f65d | 1004 | /* A cache entry has gone into a resolved state from queued */ |
0c12295a PM |
1005 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
1006 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
1007 | { |
1008 | struct sk_buff *skb; | |
9ef1d4c7 | 1009 | struct nlmsgerr *e; |
1da177e4 | 1010 | |
a8cb16dd | 1011 | /* Play the pending entries through our router */ |
494fff56 | 1012 | while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) { |
eddc9ec5 | 1013 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
1014 | struct nlmsghdr *nlh = skb_pull(skb, |
1015 | sizeof(struct iphdr)); | |
1da177e4 | 1016 | |
7b0db857 YM |
1017 | if (mr_fill_mroute(mrt, skb, &c->_c, |
1018 | nlmsg_data(nlh)) > 0) { | |
a8cb16dd ED |
1019 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
1020 | (u8 *)nlh; | |
1da177e4 LT |
1021 | } else { |
1022 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 1023 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 1024 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 1025 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
1026 | e->error = -EMSGSIZE; |
1027 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 1028 | } |
2942e900 | 1029 | |
15e47304 | 1030 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 1031 | } else { |
4b1f0d33 | 1032 | ip_mr_forward(net, mrt, skb->dev, skb, c, 0); |
a8cb16dd | 1033 | } |
1da177e4 LT |
1034 | } |
1035 | } | |
1036 | ||
5a645dd8 | 1037 | /* Bounce a cache query up to mrouted and netlink. |
1da177e4 | 1038 | * |
c316c629 | 1039 | * Called under mrt_lock. |
1da177e4 | 1040 | */ |
0c12295a | 1041 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 1042 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 | 1043 | { |
c9bdd4b5 | 1044 | const int ihl = ip_hdrlen(pkt); |
c316c629 | 1045 | struct sock *mroute_sk; |
1da177e4 LT |
1046 | struct igmphdr *igmp; |
1047 | struct igmpmsg *msg; | |
c316c629 | 1048 | struct sk_buff *skb; |
1da177e4 LT |
1049 | int ret; |
1050 | ||
c921c207 | 1051 | if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) |
1da177e4 LT |
1052 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); |
1053 | else | |
1da177e4 LT |
1054 | skb = alloc_skb(128, GFP_ATOMIC); |
1055 | ||
132adf54 | 1056 | if (!skb) |
1da177e4 LT |
1057 | return -ENOBUFS; |
1058 | ||
c921c207 | 1059 | if (assert == IGMPMSG_WHOLEPKT || assert == IGMPMSG_WRVIFWHOLE) { |
1da177e4 | 1060 | /* Ugly, but we have no choice with this interface. |
a8cb16dd ED |
1061 | * Duplicate old header, fix ihl, length etc. |
1062 | * And all this only to mangle msg->im_msgtype and | |
1063 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 1064 | */ |
878c8145 ACM |
1065 | skb_push(skb, sizeof(struct iphdr)); |
1066 | skb_reset_network_header(skb); | |
badff6d0 | 1067 | skb_reset_transport_header(skb); |
0272ffc4 | 1068 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 1069 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
c921c207 | 1070 | msg->im_msgtype = assert; |
1da177e4 | 1071 | msg->im_mbz = 0; |
c921c207 NA |
1072 | if (assert == IGMPMSG_WRVIFWHOLE) |
1073 | msg->im_vif = vifi; | |
1074 | else | |
1075 | msg->im_vif = mrt->mroute_reg_vif_num; | |
eddc9ec5 ACM |
1076 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
1077 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
1078 | sizeof(struct iphdr)); | |
c316c629 NA |
1079 | } else { |
1080 | /* Copy the IP header */ | |
1081 | skb_set_network_header(skb, skb->len); | |
1082 | skb_put(skb, ihl); | |
1083 | skb_copy_to_linear_data(skb, pkt->data, ihl); | |
1084 | /* Flag to the kernel this is a route add */ | |
1085 | ip_hdr(skb)->protocol = 0; | |
1086 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1087 | msg->im_vif = vifi; | |
1088 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); | |
1089 | /* Add our header */ | |
4df864c1 | 1090 | igmp = skb_put(skb, sizeof(struct igmphdr)); |
c316c629 NA |
1091 | igmp->type = assert; |
1092 | msg->im_msgtype = assert; | |
1093 | igmp->code = 0; | |
1094 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
1095 | skb->transport_header = skb->network_header; | |
e905a9ed | 1096 | } |
1da177e4 | 1097 | |
4c968709 ED |
1098 | rcu_read_lock(); |
1099 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
51456b29 | 1100 | if (!mroute_sk) { |
4c968709 | 1101 | rcu_read_unlock(); |
1da177e4 LT |
1102 | kfree_skb(skb); |
1103 | return -EINVAL; | |
1104 | } | |
1105 | ||
5a645dd8 JG |
1106 | igmpmsg_netlink_event(mrt, skb); |
1107 | ||
a8cb16dd | 1108 | /* Deliver to mrouted */ |
4c968709 ED |
1109 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1110 | rcu_read_unlock(); | |
70a269e6 | 1111 | if (ret < 0) { |
e87cc472 | 1112 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1113 | kfree_skb(skb); |
1114 | } | |
1115 | ||
1116 | return ret; | |
1117 | } | |
1118 | ||
7ef8f65d NA |
1119 | /* Queue a packet for resolution. It gets locked cache entry! */ |
1120 | static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, | |
4b1f0d33 | 1121 | struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 1122 | { |
8fb472c0 NA |
1123 | const struct iphdr *iph = ip_hdr(skb); |
1124 | struct mfc_cache *c; | |
862465f2 | 1125 | bool found = false; |
1da177e4 | 1126 | int err; |
1da177e4 LT |
1127 | |
1128 | spin_lock_bh(&mfc_unres_lock); | |
494fff56 | 1129 | list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) { |
e258beb2 | 1130 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1131 | c->mfc_origin == iph->saddr) { |
1132 | found = true; | |
1da177e4 | 1133 | break; |
862465f2 | 1134 | } |
1da177e4 LT |
1135 | } |
1136 | ||
862465f2 | 1137 | if (!found) { |
a8cb16dd | 1138 | /* Create a new entry if allowable */ |
0079ad8e HL |
1139 | c = ipmr_cache_alloc_unres(); |
1140 | if (!c) { | |
1da177e4 LT |
1141 | spin_unlock_bh(&mfc_unres_lock); |
1142 | ||
1143 | kfree_skb(skb); | |
1144 | return -ENOBUFS; | |
1145 | } | |
1146 | ||
a8cb16dd | 1147 | /* Fill in the new cache entry */ |
494fff56 | 1148 | c->_c.mfc_parent = -1; |
eddc9ec5 ACM |
1149 | c->mfc_origin = iph->saddr; |
1150 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1151 | |
a8cb16dd | 1152 | /* Reflect first query at mrouted. */ |
0c12295a | 1153 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
494fff56 | 1154 | |
4feb88e5 | 1155 | if (err < 0) { |
e905a9ed | 1156 | /* If the report failed throw the cache entry |
1da177e4 LT |
1157 | out - Brad Parker |
1158 | */ | |
1159 | spin_unlock_bh(&mfc_unres_lock); | |
1160 | ||
5c0a66f5 | 1161 | ipmr_cache_free(c); |
1da177e4 LT |
1162 | kfree_skb(skb); |
1163 | return err; | |
1164 | } | |
1165 | ||
0c12295a | 1166 | atomic_inc(&mrt->cache_resolve_queue_len); |
494fff56 | 1167 | list_add(&c->_c.list, &mrt->mfc_unres_queue); |
8cd3ac9f | 1168 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1169 | |
278554bd | 1170 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
494fff56 YM |
1171 | mod_timer(&mrt->ipmr_expire_timer, |
1172 | c->_c.mfc_un.unres.expires); | |
1da177e4 LT |
1173 | } |
1174 | ||
a8cb16dd | 1175 | /* See if we can append the packet */ |
494fff56 | 1176 | if (c->_c.mfc_un.unres.unresolved.qlen > 3) { |
1da177e4 LT |
1177 | kfree_skb(skb); |
1178 | err = -ENOBUFS; | |
1179 | } else { | |
4b1f0d33 DS |
1180 | if (dev) { |
1181 | skb->dev = dev; | |
1182 | skb->skb_iif = dev->ifindex; | |
1183 | } | |
494fff56 | 1184 | skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1185 | err = 0; |
1186 | } | |
1187 | ||
1188 | spin_unlock_bh(&mfc_unres_lock); | |
1189 | return err; | |
1190 | } | |
1191 | ||
7ef8f65d | 1192 | /* MFC cache manipulation by user space mroute daemon */ |
1da177e4 | 1193 | |
660b26dc | 1194 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 | 1195 | { |
b362053a | 1196 | struct net *net = read_pnet(&mrt->net); |
8fb472c0 | 1197 | struct mfc_cache *c; |
1da177e4 | 1198 | |
8fb472c0 NA |
1199 | /* The entries are added/deleted only under RTNL */ |
1200 | rcu_read_lock(); | |
1201 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1202 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1203 | rcu_read_unlock(); | |
1204 | if (!c) | |
1205 | return -ENOENT; | |
494fff56 YM |
1206 | rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ipmr_rht_params); |
1207 | list_del_rcu(&c->_c.list); | |
b362053a | 1208 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, c, mrt->id); |
8fb472c0 | 1209 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
8c13af2a | 1210 | mr_cache_put(&c->_c); |
1da177e4 | 1211 | |
8fb472c0 | 1212 | return 0; |
1da177e4 LT |
1213 | } |
1214 | ||
0c12295a | 1215 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1216 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1217 | { |
862465f2 | 1218 | struct mfc_cache *uc, *c; |
494fff56 | 1219 | struct mr_mfc *_uc; |
8fb472c0 NA |
1220 | bool found; |
1221 | int ret; | |
1da177e4 | 1222 | |
a50436f2 PM |
1223 | if (mfc->mfcc_parent >= MAXVIFS) |
1224 | return -ENFILE; | |
1225 | ||
8fb472c0 NA |
1226 | /* The entries are added/deleted only under RTNL */ |
1227 | rcu_read_lock(); | |
1228 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1229 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1230 | rcu_read_unlock(); | |
1231 | if (c) { | |
1da177e4 | 1232 | write_lock_bh(&mrt_lock); |
494fff56 YM |
1233 | c->_c.mfc_parent = mfc->mfcc_parent; |
1234 | ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls); | |
1da177e4 | 1235 | if (!mrtsock) |
494fff56 | 1236 | c->_c.mfc_flags |= MFC_STATIC; |
1da177e4 | 1237 | write_unlock_bh(&mrt_lock); |
b362053a YG |
1238 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, c, |
1239 | mrt->id); | |
8cd3ac9f | 1240 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1241 | return 0; |
1242 | } | |
1243 | ||
360eb5da | 1244 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1245 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1246 | return -EINVAL; |
1247 | ||
d658f8a0 | 1248 | c = ipmr_cache_alloc(); |
51456b29 | 1249 | if (!c) |
1da177e4 LT |
1250 | return -ENOMEM; |
1251 | ||
c354e124 JK |
1252 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1253 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
494fff56 YM |
1254 | c->_c.mfc_parent = mfc->mfcc_parent; |
1255 | ipmr_update_thresholds(mrt, &c->_c, mfc->mfcc_ttls); | |
1da177e4 | 1256 | if (!mrtsock) |
494fff56 | 1257 | c->_c.mfc_flags |= MFC_STATIC; |
1da177e4 | 1258 | |
494fff56 | 1259 | ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode, |
8fb472c0 NA |
1260 | ipmr_rht_params); |
1261 | if (ret) { | |
1262 | pr_err("ipmr: rhtable insert error %d\n", ret); | |
1263 | ipmr_cache_free(c); | |
1264 | return ret; | |
1265 | } | |
494fff56 | 1266 | list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list); |
7ef8f65d NA |
1267 | /* Check to see if we resolved a queued list. If so we |
1268 | * need to send on the frames and tidy up. | |
1da177e4 | 1269 | */ |
b0ebb739 | 1270 | found = false; |
1da177e4 | 1271 | spin_lock_bh(&mfc_unres_lock); |
494fff56 YM |
1272 | list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) { |
1273 | uc = (struct mfc_cache *)_uc; | |
e258beb2 | 1274 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1275 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
494fff56 | 1276 | list_del(&_uc->list); |
0c12295a | 1277 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1278 | found = true; |
1da177e4 LT |
1279 | break; |
1280 | } | |
1281 | } | |
0c12295a PM |
1282 | if (list_empty(&mrt->mfc_unres_queue)) |
1283 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1284 | spin_unlock_bh(&mfc_unres_lock); |
1285 | ||
b0ebb739 | 1286 | if (found) { |
0c12295a | 1287 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1288 | ipmr_cache_free(uc); |
1da177e4 | 1289 | } |
b362053a | 1290 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, c, mrt->id); |
8cd3ac9f | 1291 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1292 | return 0; |
1293 | } | |
1294 | ||
7ef8f65d | 1295 | /* Close the multicast socket, and clear the vif tables etc */ |
ca8d4794 | 1296 | static void mroute_clean_tables(struct mr_table *mrt, int flags) |
1da177e4 | 1297 | { |
b362053a | 1298 | struct net *net = read_pnet(&mrt->net); |
494fff56 YM |
1299 | struct mr_mfc *c, *tmp; |
1300 | struct mfc_cache *cache; | |
d17fa6fa | 1301 | LIST_HEAD(list); |
8fb472c0 | 1302 | int i; |
e905a9ed | 1303 | |
a8cb16dd | 1304 | /* Shut down all active vif entries */ |
ca8d4794 CS |
1305 | if (flags & (MRT_FLUSH_VIFS | MRT_FLUSH_VIFS_STATIC)) { |
1306 | for (i = 0; i < mrt->maxvif; i++) { | |
1307 | if (((mrt->vif_table[i].flags & VIFF_STATIC) && | |
1308 | !(flags & MRT_FLUSH_VIFS_STATIC)) || | |
1309 | (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT_FLUSH_VIFS))) | |
1310 | continue; | |
1311 | vif_delete(mrt, i, 0, &list); | |
1312 | } | |
1313 | unregister_netdevice_many(&list); | |
1da177e4 LT |
1314 | } |
1315 | ||
a8cb16dd | 1316 | /* Wipe the cache */ |
ca8d4794 CS |
1317 | if (flags & (MRT_FLUSH_MFC | MRT_FLUSH_MFC_STATIC)) { |
1318 | list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { | |
1319 | if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC_STATIC)) || | |
1320 | (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT_FLUSH_MFC))) | |
1321 | continue; | |
1322 | rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); | |
1323 | list_del_rcu(&c->list); | |
494fff56 | 1324 | cache = (struct mfc_cache *)c; |
ca8d4794 CS |
1325 | call_ipmr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, cache, |
1326 | mrt->id); | |
494fff56 | 1327 | mroute_netlink_event(mrt, cache, RTM_DELROUTE); |
ca8d4794 CS |
1328 | mr_cache_put(c); |
1329 | } | |
1330 | } | |
1331 | ||
1332 | if (flags & MRT_FLUSH_MFC) { | |
1333 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { | |
1334 | spin_lock_bh(&mfc_unres_lock); | |
1335 | list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { | |
1336 | list_del(&c->list); | |
1337 | cache = (struct mfc_cache *)c; | |
1338 | mroute_netlink_event(mrt, cache, RTM_DELROUTE); | |
1339 | ipmr_destroy_unres(mrt, cache); | |
1340 | } | |
1341 | spin_unlock_bh(&mfc_unres_lock); | |
1da177e4 | 1342 | } |
1da177e4 LT |
1343 | } |
1344 | } | |
1345 | ||
4c968709 ED |
1346 | /* called from ip_ra_control(), before an RCU grace period, |
1347 | * we dont need to call synchronize_rcu() here | |
1348 | */ | |
1da177e4 LT |
1349 | static void mrtsock_destruct(struct sock *sk) |
1350 | { | |
4feb88e5 | 1351 | struct net *net = sock_net(sk); |
f0ad0860 | 1352 | struct mr_table *mrt; |
4feb88e5 | 1353 | |
128aaa98 | 1354 | rtnl_lock(); |
f0ad0860 | 1355 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1356 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1357 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
3b022865 DA |
1358 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1359 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1360 | NETCONFA_IFINDEX_ALL, |
1361 | net->ipv4.devconf_all); | |
a9b3cd7f | 1362 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
ca8d4794 | 1363 | mroute_clean_tables(mrt, MRT_FLUSH_VIFS | MRT_FLUSH_MFC); |
f0ad0860 | 1364 | } |
1da177e4 | 1365 | } |
128aaa98 | 1366 | rtnl_unlock(); |
1da177e4 LT |
1367 | } |
1368 | ||
7ef8f65d NA |
1369 | /* Socket options and virtual interface manipulation. The whole |
1370 | * virtual interface system is a complete heap, but unfortunately | |
1371 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1372 | * MOSPF/PIM router set up we can clean this up. | |
1da177e4 | 1373 | */ |
e905a9ed | 1374 | |
29e97d21 NA |
1375 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, |
1376 | unsigned int optlen) | |
1da177e4 | 1377 | { |
4feb88e5 | 1378 | struct net *net = sock_net(sk); |
29e97d21 | 1379 | int val, ret = 0, parent = 0; |
f0ad0860 | 1380 | struct mr_table *mrt; |
29e97d21 NA |
1381 | struct vifctl vif; |
1382 | struct mfcctl mfc; | |
c921c207 | 1383 | bool do_wrvifwhole; |
29e97d21 | 1384 | u32 uval; |
f0ad0860 | 1385 | |
29e97d21 NA |
1386 | /* There's one exception to the lock - MRT_DONE which needs to unlock */ |
1387 | rtnl_lock(); | |
5e1859fb | 1388 | if (sk->sk_type != SOCK_RAW || |
29e97d21 NA |
1389 | inet_sk(sk)->inet_num != IPPROTO_IGMP) { |
1390 | ret = -EOPNOTSUPP; | |
1391 | goto out_unlock; | |
1392 | } | |
5e1859fb | 1393 | |
f0ad0860 | 1394 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
29e97d21 NA |
1395 | if (!mrt) { |
1396 | ret = -ENOENT; | |
1397 | goto out_unlock; | |
1398 | } | |
132adf54 | 1399 | if (optname != MRT_INIT) { |
33d480ce | 1400 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
29e97d21 NA |
1401 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
1402 | ret = -EACCES; | |
1403 | goto out_unlock; | |
1404 | } | |
1da177e4 LT |
1405 | } |
1406 | ||
132adf54 SH |
1407 | switch (optname) { |
1408 | case MRT_INIT: | |
42e6b89c | 1409 | if (optlen != sizeof(int)) { |
29e97d21 | 1410 | ret = -EINVAL; |
42e6b89c NA |
1411 | break; |
1412 | } | |
1413 | if (rtnl_dereference(mrt->mroute_sk)) { | |
29e97d21 | 1414 | ret = -EADDRINUSE; |
29e97d21 | 1415 | break; |
42e6b89c | 1416 | } |
132adf54 SH |
1417 | |
1418 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1419 | if (ret == 0) { | |
cf778b00 | 1420 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1421 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
3b022865 DA |
1422 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1423 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1424 | NETCONFA_IFINDEX_ALL, |
1425 | net->ipv4.devconf_all); | |
132adf54 | 1426 | } |
29e97d21 | 1427 | break; |
132adf54 | 1428 | case MRT_DONE: |
29e97d21 NA |
1429 | if (sk != rcu_access_pointer(mrt->mroute_sk)) { |
1430 | ret = -EACCES; | |
1431 | } else { | |
128aaa98 KT |
1432 | /* We need to unlock here because mrtsock_destruct takes |
1433 | * care of rtnl itself and we can't change that due to | |
1434 | * the IP_ROUTER_ALERT setsockopt which runs without it. | |
1435 | */ | |
1436 | rtnl_unlock(); | |
29e97d21 | 1437 | ret = ip_ra_control(sk, 0, NULL); |
128aaa98 | 1438 | goto out; |
29e97d21 NA |
1439 | } |
1440 | break; | |
132adf54 SH |
1441 | case MRT_ADD_VIF: |
1442 | case MRT_DEL_VIF: | |
29e97d21 NA |
1443 | if (optlen != sizeof(vif)) { |
1444 | ret = -EINVAL; | |
1445 | break; | |
1446 | } | |
1447 | if (copy_from_user(&vif, optval, sizeof(vif))) { | |
1448 | ret = -EFAULT; | |
1449 | break; | |
1450 | } | |
1451 | if (vif.vifc_vifi >= MAXVIFS) { | |
1452 | ret = -ENFILE; | |
1453 | break; | |
1454 | } | |
c354e124 | 1455 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1456 | ret = vif_add(net, mrt, &vif, |
1457 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1458 | } else { |
0c12295a | 1459 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 | 1460 | } |
29e97d21 | 1461 | break; |
7ef8f65d NA |
1462 | /* Manipulate the forwarding caches. These live |
1463 | * in a sort of kernel/user symbiosis. | |
1464 | */ | |
132adf54 SH |
1465 | case MRT_ADD_MFC: |
1466 | case MRT_DEL_MFC: | |
660b26dc | 1467 | parent = -1; |
a8eceea8 | 1468 | fallthrough; |
660b26dc ND |
1469 | case MRT_ADD_MFC_PROXY: |
1470 | case MRT_DEL_MFC_PROXY: | |
29e97d21 NA |
1471 | if (optlen != sizeof(mfc)) { |
1472 | ret = -EINVAL; | |
1473 | break; | |
1474 | } | |
1475 | if (copy_from_user(&mfc, optval, sizeof(mfc))) { | |
1476 | ret = -EFAULT; | |
1477 | break; | |
1478 | } | |
660b26dc ND |
1479 | if (parent == 0) |
1480 | parent = mfc.mfcc_parent; | |
660b26dc ND |
1481 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1482 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1483 | else |
4c968709 | 1484 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1485 | sk == rtnl_dereference(mrt->mroute_sk), |
1486 | parent); | |
29e97d21 | 1487 | break; |
ca8d4794 CS |
1488 | case MRT_FLUSH: |
1489 | if (optlen != sizeof(val)) { | |
1490 | ret = -EINVAL; | |
1491 | break; | |
1492 | } | |
1493 | if (get_user(val, (int __user *)optval)) { | |
1494 | ret = -EFAULT; | |
1495 | break; | |
1496 | } | |
1497 | mroute_clean_tables(mrt, val); | |
1498 | break; | |
7ef8f65d | 1499 | /* Control PIM assert. */ |
132adf54 | 1500 | case MRT_ASSERT: |
29e97d21 NA |
1501 | if (optlen != sizeof(val)) { |
1502 | ret = -EINVAL; | |
1503 | break; | |
1504 | } | |
1505 | if (get_user(val, (int __user *)optval)) { | |
1506 | ret = -EFAULT; | |
1507 | break; | |
1508 | } | |
1509 | mrt->mroute_do_assert = val; | |
1510 | break; | |
132adf54 | 1511 | case MRT_PIM: |
1973a4ea | 1512 | if (!ipmr_pimsm_enabled()) { |
29e97d21 NA |
1513 | ret = -ENOPROTOOPT; |
1514 | break; | |
1515 | } | |
1516 | if (optlen != sizeof(val)) { | |
1517 | ret = -EINVAL; | |
1518 | break; | |
1519 | } | |
1520 | if (get_user(val, (int __user *)optval)) { | |
1521 | ret = -EFAULT; | |
1522 | break; | |
1523 | } | |
ba93ef74 | 1524 | |
c921c207 | 1525 | do_wrvifwhole = (val == IGMPMSG_WRVIFWHOLE); |
29e97d21 NA |
1526 | val = !!val; |
1527 | if (val != mrt->mroute_do_pim) { | |
1528 | mrt->mroute_do_pim = val; | |
1529 | mrt->mroute_do_assert = val; | |
c921c207 | 1530 | mrt->mroute_do_wrvifwhole = do_wrvifwhole; |
1da177e4 | 1531 | } |
29e97d21 | 1532 | break; |
f0ad0860 | 1533 | case MRT_TABLE: |
29e97d21 NA |
1534 | if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) { |
1535 | ret = -ENOPROTOOPT; | |
1536 | break; | |
1537 | } | |
1538 | if (optlen != sizeof(uval)) { | |
1539 | ret = -EINVAL; | |
1540 | break; | |
1541 | } | |
1542 | if (get_user(uval, (u32 __user *)optval)) { | |
1543 | ret = -EFAULT; | |
1544 | break; | |
1545 | } | |
f0ad0860 | 1546 | |
4c968709 ED |
1547 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1548 | ret = -EBUSY; | |
1549 | } else { | |
29e97d21 | 1550 | mrt = ipmr_new_table(net, uval); |
1113ebbc NA |
1551 | if (IS_ERR(mrt)) |
1552 | ret = PTR_ERR(mrt); | |
5e1859fb | 1553 | else |
29e97d21 | 1554 | raw_sk(sk)->ipmr_table = uval; |
4c968709 | 1555 | } |
29e97d21 | 1556 | break; |
7ef8f65d | 1557 | /* Spurious command, or MRT_VERSION which you cannot set. */ |
132adf54 | 1558 | default: |
29e97d21 | 1559 | ret = -ENOPROTOOPT; |
1da177e4 | 1560 | } |
29e97d21 NA |
1561 | out_unlock: |
1562 | rtnl_unlock(); | |
128aaa98 | 1563 | out: |
29e97d21 | 1564 | return ret; |
1da177e4 LT |
1565 | } |
1566 | ||
7ef8f65d | 1567 | /* Getsock opt support for the multicast routing system. */ |
c354e124 | 1568 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1569 | { |
1570 | int olr; | |
1571 | int val; | |
4feb88e5 | 1572 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1573 | struct mr_table *mrt; |
1574 | ||
5e1859fb ED |
1575 | if (sk->sk_type != SOCK_RAW || |
1576 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1577 | return -EOPNOTSUPP; | |
1578 | ||
f0ad0860 | 1579 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1580 | if (!mrt) |
f0ad0860 | 1581 | return -ENOENT; |
1da177e4 | 1582 | |
fe9ef3ce NA |
1583 | switch (optname) { |
1584 | case MRT_VERSION: | |
1585 | val = 0x0305; | |
1586 | break; | |
1587 | case MRT_PIM: | |
1973a4ea | 1588 | if (!ipmr_pimsm_enabled()) |
fe9ef3ce NA |
1589 | return -ENOPROTOOPT; |
1590 | val = mrt->mroute_do_pim; | |
1591 | break; | |
1592 | case MRT_ASSERT: | |
1593 | val = mrt->mroute_do_assert; | |
1594 | break; | |
1595 | default: | |
1da177e4 | 1596 | return -ENOPROTOOPT; |
fe9ef3ce | 1597 | } |
1da177e4 LT |
1598 | |
1599 | if (get_user(olr, optlen)) | |
1600 | return -EFAULT; | |
1da177e4 LT |
1601 | olr = min_t(unsigned int, olr, sizeof(int)); |
1602 | if (olr < 0) | |
1603 | return -EINVAL; | |
c354e124 | 1604 | if (put_user(olr, optlen)) |
1da177e4 | 1605 | return -EFAULT; |
c354e124 | 1606 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1607 | return -EFAULT; |
1608 | return 0; | |
1609 | } | |
1610 | ||
7ef8f65d | 1611 | /* The IP multicast ioctl support routines. */ |
1da177e4 LT |
1612 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1613 | { | |
1614 | struct sioc_sg_req sr; | |
1615 | struct sioc_vif_req vr; | |
1616 | struct vif_device *vif; | |
1617 | struct mfc_cache *c; | |
4feb88e5 | 1618 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1619 | struct mr_table *mrt; |
1620 | ||
1621 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1622 | if (!mrt) |
f0ad0860 | 1623 | return -ENOENT; |
e905a9ed | 1624 | |
132adf54 SH |
1625 | switch (cmd) { |
1626 | case SIOCGETVIFCNT: | |
c354e124 | 1627 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1628 | return -EFAULT; |
0c12295a | 1629 | if (vr.vifi >= mrt->maxvif) |
132adf54 | 1630 | return -EINVAL; |
5648451e | 1631 | vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif); |
132adf54 | 1632 | read_lock(&mrt_lock); |
0c12295a PM |
1633 | vif = &mrt->vif_table[vr.vifi]; |
1634 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1635 | vr.icount = vif->pkt_in; |
1636 | vr.ocount = vif->pkt_out; | |
1637 | vr.ibytes = vif->bytes_in; | |
1638 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1639 | read_unlock(&mrt_lock); |
1da177e4 | 1640 | |
c354e124 | 1641 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1642 | return -EFAULT; |
1643 | return 0; | |
1644 | } | |
1645 | read_unlock(&mrt_lock); | |
1646 | return -EADDRNOTAVAIL; | |
1647 | case SIOCGETSGCNT: | |
c354e124 | 1648 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1649 | return -EFAULT; |
1650 | ||
a8c9486b | 1651 | rcu_read_lock(); |
0c12295a | 1652 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 | 1653 | if (c) { |
494fff56 YM |
1654 | sr.pktcnt = c->_c.mfc_un.res.pkt; |
1655 | sr.bytecnt = c->_c.mfc_un.res.bytes; | |
1656 | sr.wrong_if = c->_c.mfc_un.res.wrong_if; | |
a8c9486b | 1657 | rcu_read_unlock(); |
132adf54 | 1658 | |
c354e124 | 1659 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1660 | return -EFAULT; |
1661 | return 0; | |
1662 | } | |
a8c9486b | 1663 | rcu_read_unlock(); |
132adf54 SH |
1664 | return -EADDRNOTAVAIL; |
1665 | default: | |
1666 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1667 | } |
1668 | } | |
1669 | ||
709b46e8 EB |
1670 | #ifdef CONFIG_COMPAT |
1671 | struct compat_sioc_sg_req { | |
1672 | struct in_addr src; | |
1673 | struct in_addr grp; | |
1674 | compat_ulong_t pktcnt; | |
1675 | compat_ulong_t bytecnt; | |
1676 | compat_ulong_t wrong_if; | |
1677 | }; | |
1678 | ||
ca6b8bb0 DM |
1679 | struct compat_sioc_vif_req { |
1680 | vifi_t vifi; /* Which iface */ | |
1681 | compat_ulong_t icount; | |
1682 | compat_ulong_t ocount; | |
1683 | compat_ulong_t ibytes; | |
1684 | compat_ulong_t obytes; | |
1685 | }; | |
1686 | ||
709b46e8 EB |
1687 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1688 | { | |
0033d5ad | 1689 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1690 | struct compat_sioc_vif_req vr; |
1691 | struct vif_device *vif; | |
709b46e8 EB |
1692 | struct mfc_cache *c; |
1693 | struct net *net = sock_net(sk); | |
1694 | struct mr_table *mrt; | |
1695 | ||
1696 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1697 | if (!mrt) |
709b46e8 EB |
1698 | return -ENOENT; |
1699 | ||
1700 | switch (cmd) { | |
ca6b8bb0 DM |
1701 | case SIOCGETVIFCNT: |
1702 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1703 | return -EFAULT; | |
1704 | if (vr.vifi >= mrt->maxvif) | |
1705 | return -EINVAL; | |
5648451e | 1706 | vr.vifi = array_index_nospec(vr.vifi, mrt->maxvif); |
ca6b8bb0 DM |
1707 | read_lock(&mrt_lock); |
1708 | vif = &mrt->vif_table[vr.vifi]; | |
1709 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1710 | vr.icount = vif->pkt_in; | |
1711 | vr.ocount = vif->pkt_out; | |
1712 | vr.ibytes = vif->bytes_in; | |
1713 | vr.obytes = vif->bytes_out; | |
1714 | read_unlock(&mrt_lock); | |
1715 | ||
1716 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1717 | return -EFAULT; | |
1718 | return 0; | |
1719 | } | |
1720 | read_unlock(&mrt_lock); | |
1721 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1722 | case SIOCGETSGCNT: |
1723 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1724 | return -EFAULT; | |
1725 | ||
1726 | rcu_read_lock(); | |
1727 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1728 | if (c) { | |
494fff56 YM |
1729 | sr.pktcnt = c->_c.mfc_un.res.pkt; |
1730 | sr.bytecnt = c->_c.mfc_un.res.bytes; | |
1731 | sr.wrong_if = c->_c.mfc_un.res.wrong_if; | |
709b46e8 EB |
1732 | rcu_read_unlock(); |
1733 | ||
1734 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1735 | return -EFAULT; | |
1736 | return 0; | |
1737 | } | |
1738 | rcu_read_unlock(); | |
1739 | return -EADDRNOTAVAIL; | |
1740 | default: | |
1741 | return -ENOIOCTLCMD; | |
1742 | } | |
1743 | } | |
1744 | #endif | |
1745 | ||
1da177e4 LT |
1746 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
1747 | { | |
351638e7 | 1748 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1749 | struct net *net = dev_net(dev); |
f0ad0860 | 1750 | struct mr_table *mrt; |
1da177e4 LT |
1751 | struct vif_device *v; |
1752 | int ct; | |
e9dc8653 | 1753 | |
1da177e4 LT |
1754 | if (event != NETDEV_UNREGISTER) |
1755 | return NOTIFY_DONE; | |
f0ad0860 PM |
1756 | |
1757 | ipmr_for_each_table(mrt, net) { | |
1758 | v = &mrt->vif_table[0]; | |
1759 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1760 | if (v->dev == dev) | |
e92036a6 | 1761 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1762 | } |
1da177e4 LT |
1763 | } |
1764 | return NOTIFY_DONE; | |
1765 | } | |
1766 | ||
c354e124 | 1767 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1768 | .notifier_call = ipmr_device_event, |
1769 | }; | |
1770 | ||
7ef8f65d NA |
1771 | /* Encapsulate a packet by attaching a valid IPIP header to it. |
1772 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1773 | * important for multicast video. | |
1da177e4 | 1774 | */ |
b6a7719a HFS |
1775 | static void ip_encap(struct net *net, struct sk_buff *skb, |
1776 | __be32 saddr, __be32 daddr) | |
1da177e4 | 1777 | { |
8856dfa3 | 1778 | struct iphdr *iph; |
b71d1d42 | 1779 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1780 | |
1781 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1782 | skb->transport_header = skb->network_header; |
8856dfa3 | 1783 | skb_reset_network_header(skb); |
eddc9ec5 | 1784 | iph = ip_hdr(skb); |
1da177e4 | 1785 | |
a8cb16dd | 1786 | iph->version = 4; |
e023dd64 ACM |
1787 | iph->tos = old_iph->tos; |
1788 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1789 | iph->frag_off = 0; |
1790 | iph->daddr = daddr; | |
1791 | iph->saddr = saddr; | |
1792 | iph->protocol = IPPROTO_IPIP; | |
1793 | iph->ihl = 5; | |
1794 | iph->tot_len = htons(skb->len); | |
b6a7719a | 1795 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1796 | ip_send_check(iph); |
1797 | ||
1da177e4 | 1798 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
895b5c9f | 1799 | nf_reset_ct(skb); |
1da177e4 LT |
1800 | } |
1801 | ||
0c4b51f0 EB |
1802 | static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
1803 | struct sk_buff *skb) | |
1da177e4 | 1804 | { |
a8cb16dd | 1805 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1806 | |
73186df8 DM |
1807 | IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
1808 | IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); | |
1da177e4 LT |
1809 | |
1810 | if (unlikely(opt->optlen)) | |
1811 | ip_forward_options(skb); | |
1812 | ||
13206b6b | 1813 | return dst_output(net, sk, skb); |
1da177e4 LT |
1814 | } |
1815 | ||
a5bc9294 YG |
1816 | #ifdef CONFIG_NET_SWITCHDEV |
1817 | static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt, | |
1818 | int in_vifi, int out_vifi) | |
1819 | { | |
1820 | struct vif_device *out_vif = &mrt->vif_table[out_vifi]; | |
1821 | struct vif_device *in_vif = &mrt->vif_table[in_vifi]; | |
1822 | ||
875e8939 | 1823 | if (!skb->offload_l3_fwd_mark) |
a5bc9294 YG |
1824 | return false; |
1825 | if (!out_vif->dev_parent_id.id_len || !in_vif->dev_parent_id.id_len) | |
1826 | return false; | |
1827 | return netdev_phys_item_id_same(&out_vif->dev_parent_id, | |
1828 | &in_vif->dev_parent_id); | |
1829 | } | |
1830 | #else | |
1831 | static bool ipmr_forward_offloaded(struct sk_buff *skb, struct mr_table *mrt, | |
1832 | int in_vifi, int out_vifi) | |
1833 | { | |
1834 | return false; | |
1835 | } | |
1836 | #endif | |
1837 | ||
7ef8f65d | 1838 | /* Processing handlers for ipmr_forward */ |
1da177e4 | 1839 | |
0c12295a | 1840 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
6e0735d1 | 1841 | int in_vifi, struct sk_buff *skb, int vifi) |
1da177e4 | 1842 | { |
eddc9ec5 | 1843 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1844 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1845 | struct net_device *dev; |
1846 | struct rtable *rt; | |
31e4543d | 1847 | struct flowi4 fl4; |
1da177e4 LT |
1848 | int encap = 0; |
1849 | ||
51456b29 | 1850 | if (!vif->dev) |
1da177e4 LT |
1851 | goto out_free; |
1852 | ||
1da177e4 LT |
1853 | if (vif->flags & VIFF_REGISTER) { |
1854 | vif->pkt_out++; | |
c354e124 | 1855 | vif->bytes_out += skb->len; |
cf3677ae PE |
1856 | vif->dev->stats.tx_bytes += skb->len; |
1857 | vif->dev->stats.tx_packets++; | |
0c12295a | 1858 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1859 | goto out_free; |
1da177e4 | 1860 | } |
1da177e4 | 1861 | |
a5bc9294 YG |
1862 | if (ipmr_forward_offloaded(skb, mrt, in_vifi, vifi)) |
1863 | goto out_free; | |
1864 | ||
a8cb16dd | 1865 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1866 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1867 | vif->remote, vif->local, |
1868 | 0, 0, | |
1869 | IPPROTO_IPIP, | |
1870 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1871 | if (IS_ERR(rt)) |
1da177e4 LT |
1872 | goto out_free; |
1873 | encap = sizeof(struct iphdr); | |
1874 | } else { | |
31e4543d | 1875 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1876 | 0, 0, |
1877 | IPPROTO_IPIP, | |
1878 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1879 | if (IS_ERR(rt)) |
1da177e4 LT |
1880 | goto out_free; |
1881 | } | |
1882 | ||
d8d1f30b | 1883 | dev = rt->dst.dev; |
1da177e4 | 1884 | |
d8d1f30b | 1885 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1886 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1887 | * allow to send ICMP, so that packets will disappear |
1888 | * to blackhole. | |
1da177e4 | 1889 | */ |
73186df8 | 1890 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1891 | ip_rt_put(rt); |
1892 | goto out_free; | |
1893 | } | |
1894 | ||
d8d1f30b | 1895 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1896 | |
1897 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1898 | ip_rt_put(rt); |
1da177e4 LT |
1899 | goto out_free; |
1900 | } | |
1901 | ||
1902 | vif->pkt_out++; | |
c354e124 | 1903 | vif->bytes_out += skb->len; |
1da177e4 | 1904 | |
adf30907 | 1905 | skb_dst_drop(skb); |
d8d1f30b | 1906 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1907 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1908 | |
1909 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1910 | * What do we do with netfilter? -- RR |
1911 | */ | |
1da177e4 | 1912 | if (vif->flags & VIFF_TUNNEL) { |
b6a7719a | 1913 | ip_encap(net, skb, vif->local, vif->remote); |
1da177e4 | 1914 | /* FIXME: extra output firewall step used to be here. --RR */ |
2f4c02d4 PE |
1915 | vif->dev->stats.tx_packets++; |
1916 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1917 | } |
1918 | ||
9ee6c5dc | 1919 | IPCB(skb)->flags |= IPSKB_FORWARDED; |
1da177e4 | 1920 | |
7ef8f65d | 1921 | /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
1da177e4 LT |
1922 | * not only before forwarding, but after forwarding on all output |
1923 | * interfaces. It is clear, if mrouter runs a multicasting | |
1924 | * program, it should receive packets not depending to what interface | |
1925 | * program is joined. | |
1926 | * If we will not make it, the program will have to join on all | |
1927 | * interfaces. On the other hand, multihoming host (or router, but | |
1928 | * not mrouter) cannot join to more than one interface - it will | |
1929 | * result in receiving multiple packets. | |
1930 | */ | |
29a26a56 EB |
1931 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, |
1932 | net, NULL, skb, skb->dev, dev, | |
1da177e4 LT |
1933 | ipmr_forward_finish); |
1934 | return; | |
1935 | ||
1936 | out_free: | |
1937 | kfree_skb(skb); | |
1da177e4 LT |
1938 | } |
1939 | ||
0c12295a | 1940 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1941 | { |
1942 | int ct; | |
0c12295a PM |
1943 | |
1944 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1945 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1946 | break; |
1947 | } | |
1948 | return ct; | |
1949 | } | |
1950 | ||
1951 | /* "local" means that we should preserve one skb (for local delivery) */ | |
c4854ec8 | 1952 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 | 1953 | struct net_device *dev, struct sk_buff *skb, |
494fff56 | 1954 | struct mfc_cache *c, int local) |
1da177e4 | 1955 | { |
4b1f0d33 | 1956 | int true_vifi = ipmr_find_vif(mrt, dev); |
1da177e4 LT |
1957 | int psend = -1; |
1958 | int vif, ct; | |
1959 | ||
494fff56 YM |
1960 | vif = c->_c.mfc_parent; |
1961 | c->_c.mfc_un.res.pkt++; | |
1962 | c->_c.mfc_un.res.bytes += skb->len; | |
1963 | c->_c.mfc_un.res.lastuse = jiffies; | |
1da177e4 | 1964 | |
494fff56 | 1965 | if (c->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1966 | struct mfc_cache *cache_proxy; |
1967 | ||
1968 | /* For an (*,G) entry, we only check that the incomming | |
1969 | * interface is part of the static tree. | |
1970 | */ | |
845c9a7a | 1971 | cache_proxy = mr_mfc_find_any_parent(mrt, vif); |
660b26dc | 1972 | if (cache_proxy && |
494fff56 | 1973 | cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) |
660b26dc ND |
1974 | goto forward; |
1975 | } | |
1976 | ||
7ef8f65d | 1977 | /* Wrong interface: drop packet and (maybe) send PIM assert. */ |
4b1f0d33 | 1978 | if (mrt->vif_table[vif].dev != dev) { |
c7537967 | 1979 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1980 | /* It is our own packet, looped back. |
a8cb16dd ED |
1981 | * Very complicated situation... |
1982 | * | |
1983 | * The best workaround until routing daemons will be | |
1984 | * fixed is not to redistribute packet, if it was | |
1985 | * send through wrong interface. It means, that | |
1986 | * multicast applications WILL NOT work for | |
1987 | * (S,G), which have default multicast route pointing | |
1988 | * to wrong oif. In any case, it is not a good | |
1989 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1990 | */ |
1991 | goto dont_forward; | |
1992 | } | |
1993 | ||
494fff56 | 1994 | c->_c.mfc_un.res.wrong_if++; |
1da177e4 | 1995 | |
0c12295a | 1996 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1997 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1998 | * so that we cannot check that packet arrived on an oif. |
1999 | * It is bad, but otherwise we would need to move pretty | |
2000 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 2001 | */ |
0c12295a | 2002 | (mrt->mroute_do_pim || |
494fff56 | 2003 | c->_c.mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 2004 | time_after(jiffies, |
494fff56 YM |
2005 | c->_c.mfc_un.res.last_assert + |
2006 | MFC_ASSERT_THRESH)) { | |
2007 | c->_c.mfc_un.res.last_assert = jiffies; | |
0c12295a | 2008 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
c921c207 NA |
2009 | if (mrt->mroute_do_wrvifwhole) |
2010 | ipmr_cache_report(mrt, skb, true_vifi, | |
2011 | IGMPMSG_WRVIFWHOLE); | |
1da177e4 LT |
2012 | } |
2013 | goto dont_forward; | |
2014 | } | |
2015 | ||
660b26dc | 2016 | forward: |
0c12295a PM |
2017 | mrt->vif_table[vif].pkt_in++; |
2018 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 | 2019 | |
7ef8f65d | 2020 | /* Forward the frame */ |
494fff56 YM |
2021 | if (c->mfc_origin == htonl(INADDR_ANY) && |
2022 | c->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc | 2023 | if (true_vifi >= 0 && |
494fff56 | 2024 | true_vifi != c->_c.mfc_parent && |
660b26dc | 2025 | ip_hdr(skb)->ttl > |
494fff56 | 2026 | c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) { |
660b26dc ND |
2027 | /* It's an (*,*) entry and the packet is not coming from |
2028 | * the upstream: forward the packet to the upstream | |
2029 | * only. | |
2030 | */ | |
494fff56 | 2031 | psend = c->_c.mfc_parent; |
660b26dc ND |
2032 | goto last_forward; |
2033 | } | |
2034 | goto dont_forward; | |
2035 | } | |
494fff56 YM |
2036 | for (ct = c->_c.mfc_un.res.maxvif - 1; |
2037 | ct >= c->_c.mfc_un.res.minvif; ct--) { | |
660b26dc | 2038 | /* For (*,G) entry, don't forward to the incoming interface */ |
494fff56 | 2039 | if ((c->mfc_origin != htonl(INADDR_ANY) || |
360eb5da | 2040 | ct != true_vifi) && |
494fff56 | 2041 | ip_hdr(skb)->ttl > c->_c.mfc_un.res.ttls[ct]) { |
1da177e4 LT |
2042 | if (psend != -1) { |
2043 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 2044 | |
1da177e4 | 2045 | if (skb2) |
a5bc9294 | 2046 | ipmr_queue_xmit(net, mrt, true_vifi, |
6e0735d1 | 2047 | skb2, psend); |
1da177e4 | 2048 | } |
c354e124 | 2049 | psend = ct; |
1da177e4 LT |
2050 | } |
2051 | } | |
660b26dc | 2052 | last_forward: |
1da177e4 LT |
2053 | if (psend != -1) { |
2054 | if (local) { | |
2055 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 2056 | |
1da177e4 | 2057 | if (skb2) |
a5bc9294 | 2058 | ipmr_queue_xmit(net, mrt, true_vifi, skb2, |
6e0735d1 | 2059 | psend); |
1da177e4 | 2060 | } else { |
6e0735d1 | 2061 | ipmr_queue_xmit(net, mrt, true_vifi, skb, psend); |
c4854ec8 | 2062 | return; |
1da177e4 LT |
2063 | } |
2064 | } | |
2065 | ||
2066 | dont_forward: | |
2067 | if (!local) | |
2068 | kfree_skb(skb); | |
1da177e4 LT |
2069 | } |
2070 | ||
417da66f | 2071 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 2072 | { |
417da66f DM |
2073 | struct rtable *rt = skb_rtable(skb); |
2074 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 2075 | struct flowi4 fl4 = { |
417da66f DM |
2076 | .daddr = iph->daddr, |
2077 | .saddr = iph->saddr, | |
b0fe4a31 | 2078 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
2079 | .flowi4_oif = (rt_is_output_route(rt) ? |
2080 | skb->dev->ifindex : 0), | |
2081 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 2082 | LOOPBACK_IFINDEX : |
4fd551d7 | 2083 | skb->dev->ifindex), |
b4869889 | 2084 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
2085 | }; |
2086 | struct mr_table *mrt; | |
2087 | int err; | |
2088 | ||
da91981b | 2089 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
2090 | if (err) |
2091 | return ERR_PTR(err); | |
2092 | return mrt; | |
2093 | } | |
1da177e4 | 2094 | |
7ef8f65d NA |
2095 | /* Multicast packets for forwarding arrive here |
2096 | * Called with rcu_read_lock(); | |
1da177e4 | 2097 | */ |
1da177e4 LT |
2098 | int ip_mr_input(struct sk_buff *skb) |
2099 | { | |
2100 | struct mfc_cache *cache; | |
4feb88e5 | 2101 | struct net *net = dev_net(skb->dev); |
511c3f92 | 2102 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 2103 | struct mr_table *mrt; |
bcfc7d33 TW |
2104 | struct net_device *dev; |
2105 | ||
2106 | /* skb->dev passed in is the loX master dev for vrfs. | |
2107 | * As there are no vifs associated with loopback devices, | |
2108 | * get the proper interface that does have a vif associated with it. | |
2109 | */ | |
2110 | dev = skb->dev; | |
2111 | if (netif_is_l3_master(skb->dev)) { | |
2112 | dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); | |
2113 | if (!dev) { | |
2114 | kfree_skb(skb); | |
2115 | return -ENODEV; | |
2116 | } | |
2117 | } | |
1da177e4 LT |
2118 | |
2119 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 2120 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 2121 | */ |
4c968709 | 2122 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
2123 | goto dont_forward; |
2124 | ||
417da66f | 2125 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2126 | if (IS_ERR(mrt)) { |
2127 | kfree_skb(skb); | |
2128 | return PTR_ERR(mrt); | |
e40dbc51 | 2129 | } |
1da177e4 | 2130 | if (!local) { |
4c968709 ED |
2131 | if (IPCB(skb)->opt.router_alert) { |
2132 | if (ip_call_ra_chain(skb)) | |
2133 | return 0; | |
2134 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
2135 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
2136 | * Cisco IOS <= 11.2(8)) do not put router alert | |
2137 | * option to IGMP packets destined to routable | |
2138 | * groups. It is very bad, because it means | |
2139 | * that we can forward NO IGMP messages. | |
2140 | */ | |
2141 | struct sock *mroute_sk; | |
2142 | ||
2143 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
2144 | if (mroute_sk) { | |
895b5c9f | 2145 | nf_reset_ct(skb); |
4c968709 ED |
2146 | raw_rcv(mroute_sk, skb); |
2147 | return 0; | |
2148 | } | |
1da177e4 LT |
2149 | } |
2150 | } | |
2151 | ||
a8c9486b | 2152 | /* already under rcu_read_lock() */ |
0c12295a | 2153 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
51456b29 | 2154 | if (!cache) { |
bcfc7d33 | 2155 | int vif = ipmr_find_vif(mrt, dev); |
660b26dc ND |
2156 | |
2157 | if (vif >= 0) | |
2158 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
2159 | vif); | |
2160 | } | |
1da177e4 | 2161 | |
7ef8f65d | 2162 | /* No usable cache entry */ |
51456b29 | 2163 | if (!cache) { |
1da177e4 LT |
2164 | int vif; |
2165 | ||
2166 | if (local) { | |
2167 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2168 | ip_local_deliver(skb); | |
51456b29 | 2169 | if (!skb2) |
1da177e4 | 2170 | return -ENOBUFS; |
1da177e4 LT |
2171 | skb = skb2; |
2172 | } | |
2173 | ||
a8c9486b | 2174 | read_lock(&mrt_lock); |
bcfc7d33 | 2175 | vif = ipmr_find_vif(mrt, dev); |
1da177e4 | 2176 | if (vif >= 0) { |
4b1f0d33 | 2177 | int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev); |
1da177e4 LT |
2178 | read_unlock(&mrt_lock); |
2179 | ||
0eae88f3 | 2180 | return err2; |
1da177e4 LT |
2181 | } |
2182 | read_unlock(&mrt_lock); | |
2183 | kfree_skb(skb); | |
2184 | return -ENODEV; | |
2185 | } | |
2186 | ||
a8c9486b | 2187 | read_lock(&mrt_lock); |
4b1f0d33 | 2188 | ip_mr_forward(net, mrt, dev, skb, cache, local); |
1da177e4 LT |
2189 | read_unlock(&mrt_lock); |
2190 | ||
2191 | if (local) | |
2192 | return ip_local_deliver(skb); | |
2193 | ||
2194 | return 0; | |
2195 | ||
2196 | dont_forward: | |
2197 | if (local) | |
2198 | return ip_local_deliver(skb); | |
2199 | kfree_skb(skb); | |
2200 | return 0; | |
2201 | } | |
2202 | ||
b1879204 | 2203 | #ifdef CONFIG_IP_PIMSM_V1 |
7ef8f65d | 2204 | /* Handle IGMP messages of PIMv1 */ |
a8cb16dd | 2205 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2206 | { |
2207 | struct igmphdr *pim; | |
4feb88e5 | 2208 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2209 | struct mr_table *mrt; |
b1879204 IJ |
2210 | |
2211 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2212 | goto drop; | |
2213 | ||
2214 | pim = igmp_hdr(skb); | |
2215 | ||
417da66f | 2216 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2217 | if (IS_ERR(mrt)) |
2218 | goto drop; | |
0c12295a | 2219 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2220 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2221 | goto drop; | |
2222 | ||
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 | ||
2231 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2232 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2233 | { |
2234 | struct pimreghdr *pim; | |
f0ad0860 PM |
2235 | struct net *net = dev_net(skb->dev); |
2236 | struct mr_table *mrt; | |
1da177e4 | 2237 | |
b1879204 | 2238 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2239 | goto drop; |
2240 | ||
9c70220b | 2241 | pim = (struct pimreghdr *)skb_transport_header(skb); |
56245cae | 2242 | if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) || |
a8cb16dd | 2243 | (pim->flags & PIM_NULL_REGISTER) || |
e905a9ed | 2244 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2245 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2246 | goto drop; |
2247 | ||
417da66f | 2248 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2249 | if (IS_ERR(mrt)) |
2250 | goto drop; | |
f0ad0860 | 2251 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2252 | drop: |
2253 | kfree_skb(skb); | |
2254 | } | |
1da177e4 LT |
2255 | return 0; |
2256 | } | |
2257 | #endif | |
2258 | ||
9a1b9496 DM |
2259 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2260 | __be32 saddr, __be32 daddr, | |
9f09eaea | 2261 | struct rtmsg *rtm, u32 portid) |
1da177e4 | 2262 | { |
1da177e4 | 2263 | struct mfc_cache *cache; |
9a1b9496 DM |
2264 | struct mr_table *mrt; |
2265 | int err; | |
1da177e4 | 2266 | |
f0ad0860 | 2267 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2268 | if (!mrt) |
f0ad0860 PM |
2269 | return -ENOENT; |
2270 | ||
a8c9486b | 2271 | rcu_read_lock(); |
9a1b9496 | 2272 | cache = ipmr_cache_find(mrt, saddr, daddr); |
51456b29 | 2273 | if (!cache && skb->dev) { |
660b26dc | 2274 | int vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2275 | |
660b26dc ND |
2276 | if (vif >= 0) |
2277 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2278 | } | |
51456b29 | 2279 | if (!cache) { |
72287490 | 2280 | struct sk_buff *skb2; |
eddc9ec5 | 2281 | struct iphdr *iph; |
1da177e4 | 2282 | struct net_device *dev; |
a8cb16dd | 2283 | int vif = -1; |
1da177e4 | 2284 | |
1da177e4 | 2285 | dev = skb->dev; |
a8c9486b | 2286 | read_lock(&mrt_lock); |
a8cb16dd ED |
2287 | if (dev) |
2288 | vif = ipmr_find_vif(mrt, dev); | |
2289 | if (vif < 0) { | |
1da177e4 | 2290 | read_unlock(&mrt_lock); |
a8c9486b | 2291 | rcu_read_unlock(); |
1da177e4 LT |
2292 | return -ENODEV; |
2293 | } | |
7901cd97 GN |
2294 | |
2295 | skb2 = skb_realloc_headroom(skb, sizeof(struct iphdr)); | |
72287490 AK |
2296 | if (!skb2) { |
2297 | read_unlock(&mrt_lock); | |
a8c9486b | 2298 | rcu_read_unlock(); |
72287490 AK |
2299 | return -ENOMEM; |
2300 | } | |
2301 | ||
2cf75070 | 2302 | NETLINK_CB(skb2).portid = portid; |
e2d1bca7 ACM |
2303 | skb_push(skb2, sizeof(struct iphdr)); |
2304 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2305 | iph = ip_hdr(skb2); |
2306 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2307 | iph->saddr = saddr; |
2308 | iph->daddr = daddr; | |
eddc9ec5 | 2309 | iph->version = 0; |
4b1f0d33 | 2310 | err = ipmr_cache_unresolved(mrt, vif, skb2, dev); |
1da177e4 | 2311 | read_unlock(&mrt_lock); |
a8c9486b | 2312 | rcu_read_unlock(); |
1da177e4 LT |
2313 | return err; |
2314 | } | |
2315 | ||
a8c9486b | 2316 | read_lock(&mrt_lock); |
7b0db857 | 2317 | err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); |
1da177e4 | 2318 | read_unlock(&mrt_lock); |
a8c9486b | 2319 | rcu_read_unlock(); |
1da177e4 LT |
2320 | return err; |
2321 | } | |
2322 | ||
cb6a4e46 | 2323 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2324 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2325 | int flags) | |
cb6a4e46 PM |
2326 | { |
2327 | struct nlmsghdr *nlh; | |
2328 | struct rtmsg *rtm; | |
1eb99af5 | 2329 | int err; |
cb6a4e46 | 2330 | |
65886f43 | 2331 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
51456b29 | 2332 | if (!nlh) |
cb6a4e46 PM |
2333 | return -EMSGSIZE; |
2334 | ||
2335 | rtm = nlmsg_data(nlh); | |
2336 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2337 | rtm->rtm_dst_len = 32; | |
2338 | rtm->rtm_src_len = 32; | |
2339 | rtm->rtm_tos = 0; | |
2340 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2341 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2342 | goto nla_put_failure; | |
cb6a4e46 PM |
2343 | rtm->rtm_type = RTN_MULTICAST; |
2344 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
494fff56 | 2345 | if (c->_c.mfc_flags & MFC_STATIC) |
9a68ac72 ND |
2346 | rtm->rtm_protocol = RTPROT_STATIC; |
2347 | else | |
2348 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2349 | rtm->rtm_flags = 0; |
2350 | ||
930345ea JB |
2351 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
2352 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) | |
f3756b79 | 2353 | goto nla_put_failure; |
7b0db857 | 2354 | err = mr_fill_mroute(mrt, skb, &c->_c, rtm); |
1eb99af5 ND |
2355 | /* do not break the dump if cache is unresolved */ |
2356 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2357 | goto nla_put_failure; |
2358 | ||
053c095a JB |
2359 | nlmsg_end(skb, nlh); |
2360 | return 0; | |
cb6a4e46 PM |
2361 | |
2362 | nla_put_failure: | |
2363 | nlmsg_cancel(skb, nlh); | |
2364 | return -EMSGSIZE; | |
2365 | } | |
2366 | ||
7b0db857 YM |
2367 | static int _ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2368 | u32 portid, u32 seq, struct mr_mfc *c, int cmd, | |
2369 | int flags) | |
2370 | { | |
2371 | return ipmr_fill_mroute(mrt, skb, portid, seq, (struct mfc_cache *)c, | |
2372 | cmd, flags); | |
2373 | } | |
2374 | ||
8cd3ac9f ND |
2375 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2376 | { | |
2377 | size_t len = | |
2378 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2379 | + nla_total_size(4) /* RTA_TABLE */ | |
2380 | + nla_total_size(4) /* RTA_SRC */ | |
2381 | + nla_total_size(4) /* RTA_DST */ | |
2382 | ; | |
2383 | ||
2384 | if (!unresolved) | |
2385 | len = len | |
2386 | + nla_total_size(4) /* RTA_IIF */ | |
2387 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2388 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2389 | /* RTA_MFC_STATS */ | |
a9a08042 | 2390 | + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) |
8cd3ac9f ND |
2391 | ; |
2392 | ||
2393 | return len; | |
2394 | } | |
2395 | ||
2396 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2397 | int cmd) | |
2398 | { | |
2399 | struct net *net = read_pnet(&mrt->net); | |
2400 | struct sk_buff *skb; | |
2401 | int err = -ENOBUFS; | |
2402 | ||
494fff56 YM |
2403 | skb = nlmsg_new(mroute_msgsize(mfc->_c.mfc_parent >= MAXVIFS, |
2404 | mrt->maxvif), | |
8cd3ac9f | 2405 | GFP_ATOMIC); |
51456b29 | 2406 | if (!skb) |
8cd3ac9f ND |
2407 | goto errout; |
2408 | ||
65886f43 | 2409 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2410 | if (err < 0) |
2411 | goto errout; | |
2412 | ||
2413 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2414 | return; | |
2415 | ||
2416 | errout: | |
2417 | kfree_skb(skb); | |
2418 | if (err < 0) | |
2419 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2420 | } | |
2421 | ||
5a645dd8 JG |
2422 | static size_t igmpmsg_netlink_msgsize(size_t payloadlen) |
2423 | { | |
2424 | size_t len = | |
2425 | NLMSG_ALIGN(sizeof(struct rtgenmsg)) | |
2426 | + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */ | |
2427 | + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */ | |
2428 | + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */ | |
2429 | + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */ | |
2430 | /* IPMRA_CREPORT_PKT */ | |
2431 | + nla_total_size(payloadlen) | |
2432 | ; | |
2433 | ||
2434 | return len; | |
2435 | } | |
2436 | ||
2437 | static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt) | |
2438 | { | |
2439 | struct net *net = read_pnet(&mrt->net); | |
2440 | struct nlmsghdr *nlh; | |
2441 | struct rtgenmsg *rtgenm; | |
2442 | struct igmpmsg *msg; | |
2443 | struct sk_buff *skb; | |
2444 | struct nlattr *nla; | |
2445 | int payloadlen; | |
2446 | ||
2447 | payloadlen = pkt->len - sizeof(struct igmpmsg); | |
2448 | msg = (struct igmpmsg *)skb_network_header(pkt); | |
2449 | ||
2450 | skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC); | |
2451 | if (!skb) | |
2452 | goto errout; | |
2453 | ||
2454 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, | |
2455 | sizeof(struct rtgenmsg), 0); | |
2456 | if (!nlh) | |
2457 | goto errout; | |
2458 | rtgenm = nlmsg_data(nlh); | |
2459 | rtgenm->rtgen_family = RTNL_FAMILY_IPMR; | |
2460 | if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) || | |
2461 | nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) || | |
2462 | nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR, | |
2463 | msg->im_src.s_addr) || | |
2464 | nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR, | |
2465 | msg->im_dst.s_addr)) | |
2466 | goto nla_put_failure; | |
2467 | ||
2468 | nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen); | |
2469 | if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg), | |
2470 | nla_data(nla), payloadlen)) | |
2471 | goto nla_put_failure; | |
2472 | ||
2473 | nlmsg_end(skb, nlh); | |
2474 | ||
2475 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC); | |
2476 | return; | |
2477 | ||
2478 | nla_put_failure: | |
2479 | nlmsg_cancel(skb, nlh); | |
2480 | errout: | |
2481 | kfree_skb(skb); | |
2482 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS); | |
2483 | } | |
2484 | ||
d0440029 JK |
2485 | static int ipmr_rtm_valid_getroute_req(struct sk_buff *skb, |
2486 | const struct nlmsghdr *nlh, | |
2487 | struct nlattr **tb, | |
2488 | struct netlink_ext_ack *extack) | |
2489 | { | |
2490 | struct rtmsg *rtm; | |
2491 | int i, err; | |
2492 | ||
2493 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
2494 | NL_SET_ERR_MSG(extack, "ipv4: Invalid header for multicast route get request"); | |
2495 | return -EINVAL; | |
2496 | } | |
2497 | ||
2498 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
2499 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
2500 | rtm_ipv4_policy, extack); | |
d0440029 JK |
2501 | |
2502 | rtm = nlmsg_data(nlh); | |
2503 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) || | |
2504 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) || | |
2505 | rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol || | |
2506 | rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) { | |
2507 | NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for multicast route get request"); | |
2508 | return -EINVAL; | |
2509 | } | |
2510 | ||
8cb08174 JB |
2511 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
2512 | rtm_ipv4_policy, extack); | |
d0440029 JK |
2513 | if (err) |
2514 | return err; | |
2515 | ||
2516 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
2517 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
2518 | NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4"); | |
2519 | return -EINVAL; | |
2520 | } | |
2521 | ||
2522 | for (i = 0; i <= RTA_MAX; i++) { | |
2523 | if (!tb[i]) | |
2524 | continue; | |
2525 | ||
2526 | switch (i) { | |
2527 | case RTA_SRC: | |
2528 | case RTA_DST: | |
2529 | case RTA_TABLE: | |
2530 | break; | |
2531 | default: | |
2532 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in multicast route get request"); | |
2533 | return -EINVAL; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | return 0; | |
2538 | } | |
2539 | ||
4f75ba69 DS |
2540 | static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
2541 | struct netlink_ext_ack *extack) | |
2542 | { | |
2543 | struct net *net = sock_net(in_skb->sk); | |
2544 | struct nlattr *tb[RTA_MAX + 1]; | |
2545 | struct sk_buff *skb = NULL; | |
2546 | struct mfc_cache *cache; | |
2547 | struct mr_table *mrt; | |
4f75ba69 DS |
2548 | __be32 src, grp; |
2549 | u32 tableid; | |
2550 | int err; | |
2551 | ||
d0440029 | 2552 | err = ipmr_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
4f75ba69 DS |
2553 | if (err < 0) |
2554 | goto errout; | |
2555 | ||
4f75ba69 DS |
2556 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
2557 | grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
2558 | tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; | |
2559 | ||
2560 | mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT); | |
2e3d232e DC |
2561 | if (!mrt) { |
2562 | err = -ENOENT; | |
4f75ba69 DS |
2563 | goto errout_free; |
2564 | } | |
2565 | ||
2566 | /* entries are added/deleted only under RTNL */ | |
2567 | rcu_read_lock(); | |
2568 | cache = ipmr_cache_find(mrt, src, grp); | |
2569 | rcu_read_unlock(); | |
2570 | if (!cache) { | |
2571 | err = -ENOENT; | |
2572 | goto errout_free; | |
2573 | } | |
2574 | ||
2575 | skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL); | |
2576 | if (!skb) { | |
2577 | err = -ENOBUFS; | |
2578 | goto errout_free; | |
2579 | } | |
2580 | ||
2581 | err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, | |
2582 | nlh->nlmsg_seq, cache, | |
2583 | RTM_NEWROUTE, 0); | |
2584 | if (err < 0) | |
2585 | goto errout_free; | |
2586 | ||
2587 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
2588 | ||
2589 | errout: | |
2590 | return err; | |
2591 | ||
2592 | errout_free: | |
2593 | kfree_skb(skb); | |
2594 | goto errout; | |
2595 | } | |
2596 | ||
cb6a4e46 PM |
2597 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2598 | { | |
4724676d | 2599 | struct fib_dump_filter filter = {}; |
cb167893 | 2600 | int err; |
4724676d | 2601 | |
e8ba330a | 2602 | if (cb->strict_check) { |
4724676d | 2603 | err = ip_valid_fib_dump_req(sock_net(skb->sk), cb->nlh, |
effe6792 | 2604 | &filter, cb); |
e8ba330a DA |
2605 | if (err < 0) |
2606 | return err; | |
2607 | } | |
2608 | ||
cb167893 DA |
2609 | if (filter.table_id) { |
2610 | struct mr_table *mrt; | |
2611 | ||
2612 | mrt = ipmr_get_table(sock_net(skb->sk), filter.table_id); | |
2613 | if (!mrt) { | |
ae677bbb DA |
2614 | if (filter.dump_all_families) |
2615 | return skb->len; | |
2616 | ||
cb167893 DA |
2617 | NL_SET_ERR_MSG(cb->extack, "ipv4: MR table does not exist"); |
2618 | return -ENOENT; | |
2619 | } | |
2620 | err = mr_table_dump(mrt, skb, cb, _ipmr_fill_mroute, | |
2621 | &mfc_unres_lock, &filter); | |
2622 | return skb->len ? : err; | |
2623 | } | |
2624 | ||
7b0db857 | 2625 | return mr_rtm_dumproute(skb, cb, ipmr_mr_table_iter, |
cb167893 | 2626 | _ipmr_fill_mroute, &mfc_unres_lock, &filter); |
cb6a4e46 PM |
2627 | } |
2628 | ||
ccbb0aa6 NA |
2629 | static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = { |
2630 | [RTA_SRC] = { .type = NLA_U32 }, | |
2631 | [RTA_DST] = { .type = NLA_U32 }, | |
2632 | [RTA_IIF] = { .type = NLA_U32 }, | |
2633 | [RTA_TABLE] = { .type = NLA_U32 }, | |
2634 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, | |
2635 | }; | |
2636 | ||
2637 | static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol) | |
2638 | { | |
2639 | switch (rtm_protocol) { | |
2640 | case RTPROT_STATIC: | |
2641 | case RTPROT_MROUTED: | |
2642 | return true; | |
2643 | } | |
2644 | return false; | |
2645 | } | |
2646 | ||
2647 | static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc) | |
2648 | { | |
2649 | struct rtnexthop *rtnh = nla_data(nla); | |
2650 | int remaining = nla_len(nla), vifi = 0; | |
2651 | ||
2652 | while (rtnh_ok(rtnh, remaining)) { | |
2653 | mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops; | |
2654 | if (++vifi == MAXVIFS) | |
2655 | break; | |
2656 | rtnh = rtnh_next(rtnh, &remaining); | |
2657 | } | |
2658 | ||
2659 | return remaining > 0 ? -EINVAL : vifi; | |
2660 | } | |
2661 | ||
2662 | /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */ | |
2663 | static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh, | |
2664 | struct mfcctl *mfcc, int *mrtsock, | |
c21ef3e3 DA |
2665 | struct mr_table **mrtret, |
2666 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2667 | { |
2668 | struct net_device *dev = NULL; | |
2669 | u32 tblid = RT_TABLE_DEFAULT; | |
2670 | struct mr_table *mrt; | |
2671 | struct nlattr *attr; | |
2672 | struct rtmsg *rtm; | |
2673 | int ret, rem; | |
2674 | ||
8cb08174 JB |
2675 | ret = nlmsg_validate_deprecated(nlh, sizeof(*rtm), RTA_MAX, |
2676 | rtm_ipmr_policy, extack); | |
ccbb0aa6 NA |
2677 | if (ret < 0) |
2678 | goto out; | |
2679 | rtm = nlmsg_data(nlh); | |
2680 | ||
2681 | ret = -EINVAL; | |
2682 | if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 || | |
2683 | rtm->rtm_type != RTN_MULTICAST || | |
2684 | rtm->rtm_scope != RT_SCOPE_UNIVERSE || | |
2685 | !ipmr_rtm_validate_proto(rtm->rtm_protocol)) | |
2686 | goto out; | |
2687 | ||
2688 | memset(mfcc, 0, sizeof(*mfcc)); | |
2689 | mfcc->mfcc_parent = -1; | |
2690 | ret = 0; | |
2691 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) { | |
2692 | switch (nla_type(attr)) { | |
2693 | case RTA_SRC: | |
2694 | mfcc->mfcc_origin.s_addr = nla_get_be32(attr); | |
2695 | break; | |
2696 | case RTA_DST: | |
2697 | mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr); | |
2698 | break; | |
2699 | case RTA_IIF: | |
2700 | dev = __dev_get_by_index(net, nla_get_u32(attr)); | |
2701 | if (!dev) { | |
2702 | ret = -ENODEV; | |
2703 | goto out; | |
2704 | } | |
2705 | break; | |
2706 | case RTA_MULTIPATH: | |
2707 | if (ipmr_nla_get_ttls(attr, mfcc) < 0) { | |
2708 | ret = -EINVAL; | |
2709 | goto out; | |
2710 | } | |
2711 | break; | |
2712 | case RTA_PREFSRC: | |
2713 | ret = 1; | |
2714 | break; | |
2715 | case RTA_TABLE: | |
2716 | tblid = nla_get_u32(attr); | |
2717 | break; | |
2718 | } | |
2719 | } | |
2720 | mrt = ipmr_get_table(net, tblid); | |
2721 | if (!mrt) { | |
2722 | ret = -ENOENT; | |
2723 | goto out; | |
2724 | } | |
2725 | *mrtret = mrt; | |
2726 | *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0; | |
2727 | if (dev) | |
2728 | mfcc->mfcc_parent = ipmr_find_vif(mrt, dev); | |
2729 | ||
2730 | out: | |
2731 | return ret; | |
2732 | } | |
2733 | ||
2734 | /* takes care of both newroute and delroute */ | |
c21ef3e3 DA |
2735 | static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh, |
2736 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2737 | { |
2738 | struct net *net = sock_net(skb->sk); | |
2739 | int ret, mrtsock, parent; | |
2740 | struct mr_table *tbl; | |
2741 | struct mfcctl mfcc; | |
2742 | ||
2743 | mrtsock = 0; | |
2744 | tbl = NULL; | |
c21ef3e3 | 2745 | ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack); |
ccbb0aa6 NA |
2746 | if (ret < 0) |
2747 | return ret; | |
2748 | ||
2749 | parent = ret ? mfcc.mfcc_parent : -1; | |
2750 | if (nlh->nlmsg_type == RTM_NEWROUTE) | |
2751 | return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent); | |
2752 | else | |
2753 | return ipmr_mfc_delete(tbl, &mfcc, parent); | |
2754 | } | |
2755 | ||
772c344d NA |
2756 | static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb) |
2757 | { | |
2758 | u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len); | |
2759 | ||
2760 | if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) || | |
2761 | nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) || | |
2762 | nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM, | |
2763 | mrt->mroute_reg_vif_num) || | |
2764 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT, | |
2765 | mrt->mroute_do_assert) || | |
c921c207 NA |
2766 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim) || |
2767 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE, | |
2768 | mrt->mroute_do_wrvifwhole)) | |
772c344d NA |
2769 | return false; |
2770 | ||
2771 | return true; | |
2772 | } | |
2773 | ||
2774 | static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb) | |
2775 | { | |
2776 | struct nlattr *vif_nest; | |
2777 | struct vif_device *vif; | |
2778 | ||
2779 | /* if the VIF doesn't exist just continue */ | |
2780 | if (!VIF_EXISTS(mrt, vifid)) | |
2781 | return true; | |
2782 | ||
2783 | vif = &mrt->vif_table[vifid]; | |
ae0be8de | 2784 | vif_nest = nla_nest_start_noflag(skb, IPMRA_VIF); |
772c344d NA |
2785 | if (!vif_nest) |
2786 | return false; | |
2787 | if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) || | |
2788 | nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) || | |
2789 | nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) || | |
2790 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in, | |
2791 | IPMRA_VIFA_PAD) || | |
2792 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out, | |
2793 | IPMRA_VIFA_PAD) || | |
2794 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in, | |
2795 | IPMRA_VIFA_PAD) || | |
2796 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out, | |
2797 | IPMRA_VIFA_PAD) || | |
2798 | nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) || | |
2799 | nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) { | |
2800 | nla_nest_cancel(skb, vif_nest); | |
2801 | return false; | |
2802 | } | |
2803 | nla_nest_end(skb, vif_nest); | |
2804 | ||
2805 | return true; | |
2806 | } | |
2807 | ||
14fc5bb2 DA |
2808 | static int ipmr_valid_dumplink(const struct nlmsghdr *nlh, |
2809 | struct netlink_ext_ack *extack) | |
2810 | { | |
2811 | struct ifinfomsg *ifm; | |
2812 | ||
2813 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { | |
2814 | NL_SET_ERR_MSG(extack, "ipv4: Invalid header for ipmr link dump"); | |
2815 | return -EINVAL; | |
2816 | } | |
2817 | ||
2818 | if (nlmsg_attrlen(nlh, sizeof(*ifm))) { | |
2819 | NL_SET_ERR_MSG(extack, "Invalid data after header in ipmr link dump"); | |
2820 | return -EINVAL; | |
2821 | } | |
2822 | ||
2823 | ifm = nlmsg_data(nlh); | |
2824 | if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || | |
2825 | ifm->ifi_change || ifm->ifi_index) { | |
2826 | NL_SET_ERR_MSG(extack, "Invalid values in header for ipmr link dump request"); | |
2827 | return -EINVAL; | |
2828 | } | |
2829 | ||
2830 | return 0; | |
2831 | } | |
2832 | ||
772c344d NA |
2833 | static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb) |
2834 | { | |
2835 | struct net *net = sock_net(skb->sk); | |
2836 | struct nlmsghdr *nlh = NULL; | |
2837 | unsigned int t = 0, s_t; | |
2838 | unsigned int e = 0, s_e; | |
2839 | struct mr_table *mrt; | |
2840 | ||
14fc5bb2 DA |
2841 | if (cb->strict_check) { |
2842 | int err = ipmr_valid_dumplink(cb->nlh, cb->extack); | |
2843 | ||
2844 | if (err < 0) | |
2845 | return err; | |
2846 | } | |
2847 | ||
772c344d NA |
2848 | s_t = cb->args[0]; |
2849 | s_e = cb->args[1]; | |
2850 | ||
2851 | ipmr_for_each_table(mrt, net) { | |
2852 | struct nlattr *vifs, *af; | |
2853 | struct ifinfomsg *hdr; | |
2854 | u32 i; | |
2855 | ||
2856 | if (t < s_t) | |
2857 | goto skip_table; | |
2858 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
2859 | cb->nlh->nlmsg_seq, RTM_NEWLINK, | |
2860 | sizeof(*hdr), NLM_F_MULTI); | |
2861 | if (!nlh) | |
2862 | break; | |
2863 | ||
2864 | hdr = nlmsg_data(nlh); | |
2865 | memset(hdr, 0, sizeof(*hdr)); | |
2866 | hdr->ifi_family = RTNL_FAMILY_IPMR; | |
2867 | ||
ae0be8de | 2868 | af = nla_nest_start_noflag(skb, IFLA_AF_SPEC); |
772c344d NA |
2869 | if (!af) { |
2870 | nlmsg_cancel(skb, nlh); | |
2871 | goto out; | |
2872 | } | |
2873 | ||
2874 | if (!ipmr_fill_table(mrt, skb)) { | |
2875 | nlmsg_cancel(skb, nlh); | |
2876 | goto out; | |
2877 | } | |
2878 | ||
ae0be8de | 2879 | vifs = nla_nest_start_noflag(skb, IPMRA_TABLE_VIFS); |
772c344d NA |
2880 | if (!vifs) { |
2881 | nla_nest_end(skb, af); | |
2882 | nlmsg_end(skb, nlh); | |
2883 | goto out; | |
2884 | } | |
2885 | for (i = 0; i < mrt->maxvif; i++) { | |
2886 | if (e < s_e) | |
2887 | goto skip_entry; | |
2888 | if (!ipmr_fill_vif(mrt, i, skb)) { | |
2889 | nla_nest_end(skb, vifs); | |
2890 | nla_nest_end(skb, af); | |
2891 | nlmsg_end(skb, nlh); | |
2892 | goto out; | |
2893 | } | |
2894 | skip_entry: | |
2895 | e++; | |
2896 | } | |
2897 | s_e = 0; | |
2898 | e = 0; | |
2899 | nla_nest_end(skb, vifs); | |
2900 | nla_nest_end(skb, af); | |
2901 | nlmsg_end(skb, nlh); | |
2902 | skip_table: | |
2903 | t++; | |
2904 | } | |
2905 | ||
2906 | out: | |
2907 | cb->args[1] = e; | |
2908 | cb->args[0] = t; | |
2909 | ||
2910 | return skb->len; | |
2911 | } | |
2912 | ||
e905a9ed | 2913 | #ifdef CONFIG_PROC_FS |
7ef8f65d NA |
2914 | /* The /proc interfaces to multicast routing : |
2915 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 | 2916 | */ |
1da177e4 LT |
2917 | |
2918 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2919 | __acquires(mrt_lock) |
1da177e4 | 2920 | { |
3feda6b4 | 2921 | struct mr_vif_iter *iter = seq->private; |
f6bb4514 | 2922 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2923 | struct mr_table *mrt; |
2924 | ||
2925 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 2926 | if (!mrt) |
f0ad0860 PM |
2927 | return ERR_PTR(-ENOENT); |
2928 | ||
2929 | iter->mrt = mrt; | |
f6bb4514 | 2930 | |
1da177e4 | 2931 | read_lock(&mrt_lock); |
3feda6b4 | 2932 | return mr_vif_seq_start(seq, pos); |
1da177e4 LT |
2933 | } |
2934 | ||
2935 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2936 | __releases(mrt_lock) |
1da177e4 LT |
2937 | { |
2938 | read_unlock(&mrt_lock); | |
2939 | } | |
2940 | ||
2941 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2942 | { | |
3feda6b4 | 2943 | struct mr_vif_iter *iter = seq->private; |
f0ad0860 | 2944 | struct mr_table *mrt = iter->mrt; |
f6bb4514 | 2945 | |
1da177e4 | 2946 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2947 | seq_puts(seq, |
1da177e4 LT |
2948 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2949 | } else { | |
2950 | const struct vif_device *vif = v; | |
6853f21f YM |
2951 | const char *name = vif->dev ? |
2952 | vif->dev->name : "none"; | |
1da177e4 LT |
2953 | |
2954 | seq_printf(seq, | |
91e6dd82 | 2955 | "%2td %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
0c12295a | 2956 | vif - mrt->vif_table, |
e905a9ed | 2957 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2958 | vif->bytes_out, vif->pkt_out, |
2959 | vif->flags, vif->local, vif->remote); | |
2960 | } | |
2961 | return 0; | |
2962 | } | |
2963 | ||
f690808e | 2964 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 | 2965 | .start = ipmr_vif_seq_start, |
3feda6b4 | 2966 | .next = mr_vif_seq_next, |
1da177e4 LT |
2967 | .stop = ipmr_vif_seq_stop, |
2968 | .show = ipmr_vif_seq_show, | |
2969 | }; | |
2970 | ||
1da177e4 LT |
2971 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) |
2972 | { | |
f6bb4514 | 2973 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2974 | struct mr_table *mrt; |
f6bb4514 | 2975 | |
f0ad0860 | 2976 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2977 | if (!mrt) |
f0ad0860 | 2978 | return ERR_PTR(-ENOENT); |
f6bb4514 | 2979 | |
c8d61968 | 2980 | return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock); |
1da177e4 LT |
2981 | } |
2982 | ||
2983 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2984 | { | |
2985 | int n; | |
2986 | ||
2987 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2988 | seq_puts(seq, |
1da177e4 LT |
2989 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2990 | } else { | |
2991 | const struct mfc_cache *mfc = v; | |
c8d61968 | 2992 | const struct mr_mfc_iter *it = seq->private; |
f0ad0860 | 2993 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2994 | |
0eae88f3 ED |
2995 | seq_printf(seq, "%08X %08X %-3hd", |
2996 | (__force u32) mfc->mfc_mcastgrp, | |
2997 | (__force u32) mfc->mfc_origin, | |
494fff56 | 2998 | mfc->_c.mfc_parent); |
1da177e4 | 2999 | |
0c12295a | 3000 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 | 3001 | seq_printf(seq, " %8lu %8lu %8lu", |
494fff56 YM |
3002 | mfc->_c.mfc_un.res.pkt, |
3003 | mfc->_c.mfc_un.res.bytes, | |
3004 | mfc->_c.mfc_un.res.wrong_if); | |
3005 | for (n = mfc->_c.mfc_un.res.minvif; | |
3006 | n < mfc->_c.mfc_un.res.maxvif; n++) { | |
0c12295a | 3007 | if (VIF_EXISTS(mrt, n) && |
494fff56 | 3008 | mfc->_c.mfc_un.res.ttls[n] < 255) |
cf958ae3 | 3009 | seq_printf(seq, |
e905a9ed | 3010 | " %2d:%-3d", |
494fff56 | 3011 | n, mfc->_c.mfc_un.res.ttls[n]); |
1da177e4 | 3012 | } |
1ea472e2 BT |
3013 | } else { |
3014 | /* unresolved mfc_caches don't contain | |
3015 | * pkt, bytes and wrong_if values | |
3016 | */ | |
3017 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
3018 | } |
3019 | seq_putc(seq, '\n'); | |
3020 | } | |
3021 | return 0; | |
3022 | } | |
3023 | ||
f690808e | 3024 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 | 3025 | .start = ipmr_mfc_seq_start, |
c8d61968 YM |
3026 | .next = mr_mfc_seq_next, |
3027 | .stop = mr_mfc_seq_stop, | |
1da177e4 LT |
3028 | .show = ipmr_mfc_seq_show, |
3029 | }; | |
e905a9ed | 3030 | #endif |
1da177e4 LT |
3031 | |
3032 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 3033 | static const struct net_protocol pim_protocol = { |
1da177e4 | 3034 | .handler = pim_rcv, |
403dbb97 | 3035 | .netns_ok = 1, |
1da177e4 LT |
3036 | }; |
3037 | #endif | |
3038 | ||
4d65b948 YG |
3039 | static unsigned int ipmr_seq_read(struct net *net) |
3040 | { | |
3041 | ASSERT_RTNL(); | |
3042 | ||
3043 | return net->ipv4.ipmr_seq + ipmr_rules_seq_read(net); | |
3044 | } | |
3045 | ||
b7a59557 JP |
3046 | static int ipmr_dump(struct net *net, struct notifier_block *nb, |
3047 | struct netlink_ext_ack *extack) | |
4d65b948 | 3048 | { |
cdc9f944 | 3049 | return mr_dump(net, nb, RTNL_FAMILY_IPMR, ipmr_rules_dump, |
b7a59557 | 3050 | ipmr_mr_table_iter, &mrt_lock, extack); |
4d65b948 YG |
3051 | } |
3052 | ||
3053 | static const struct fib_notifier_ops ipmr_notifier_ops_template = { | |
3054 | .family = RTNL_FAMILY_IPMR, | |
3055 | .fib_seq_read = ipmr_seq_read, | |
3056 | .fib_dump = ipmr_dump, | |
3057 | .owner = THIS_MODULE, | |
3058 | }; | |
3059 | ||
ef739d8a | 3060 | static int __net_init ipmr_notifier_init(struct net *net) |
4d65b948 YG |
3061 | { |
3062 | struct fib_notifier_ops *ops; | |
3063 | ||
3064 | net->ipv4.ipmr_seq = 0; | |
3065 | ||
3066 | ops = fib_notifier_ops_register(&ipmr_notifier_ops_template, net); | |
3067 | if (IS_ERR(ops)) | |
3068 | return PTR_ERR(ops); | |
3069 | net->ipv4.ipmr_notifier_ops = ops; | |
3070 | ||
3071 | return 0; | |
3072 | } | |
3073 | ||
3074 | static void __net_exit ipmr_notifier_exit(struct net *net) | |
3075 | { | |
3076 | fib_notifier_ops_unregister(net->ipv4.ipmr_notifier_ops); | |
3077 | net->ipv4.ipmr_notifier_ops = NULL; | |
3078 | } | |
3079 | ||
7ef8f65d | 3080 | /* Setup for IP multicast routing */ |
cf958ae3 BT |
3081 | static int __net_init ipmr_net_init(struct net *net) |
3082 | { | |
f0ad0860 | 3083 | int err; |
cf958ae3 | 3084 | |
4d65b948 YG |
3085 | err = ipmr_notifier_init(net); |
3086 | if (err) | |
3087 | goto ipmr_notifier_fail; | |
3088 | ||
f0ad0860 PM |
3089 | err = ipmr_rules_init(net); |
3090 | if (err < 0) | |
4d65b948 | 3091 | goto ipmr_rules_fail; |
f6bb4514 BT |
3092 | |
3093 | #ifdef CONFIG_PROC_FS | |
3094 | err = -ENOMEM; | |
c3506372 CH |
3095 | if (!proc_create_net("ip_mr_vif", 0, net->proc_net, &ipmr_vif_seq_ops, |
3096 | sizeof(struct mr_vif_iter))) | |
f6bb4514 | 3097 | goto proc_vif_fail; |
c3506372 CH |
3098 | if (!proc_create_net("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops, |
3099 | sizeof(struct mr_mfc_iter))) | |
f6bb4514 BT |
3100 | goto proc_cache_fail; |
3101 | #endif | |
2bb8b26c BT |
3102 | return 0; |
3103 | ||
f6bb4514 BT |
3104 | #ifdef CONFIG_PROC_FS |
3105 | proc_cache_fail: | |
ece31ffd | 3106 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 3107 | proc_vif_fail: |
f0ad0860 | 3108 | ipmr_rules_exit(net); |
f6bb4514 | 3109 | #endif |
4d65b948 YG |
3110 | ipmr_rules_fail: |
3111 | ipmr_notifier_exit(net); | |
3112 | ipmr_notifier_fail: | |
cf958ae3 BT |
3113 | return err; |
3114 | } | |
3115 | ||
3116 | static void __net_exit ipmr_net_exit(struct net *net) | |
3117 | { | |
f6bb4514 | 3118 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
3119 | remove_proc_entry("ip_mr_cache", net->proc_net); |
3120 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 3121 | #endif |
4d65b948 | 3122 | ipmr_notifier_exit(net); |
f0ad0860 | 3123 | ipmr_rules_exit(net); |
cf958ae3 BT |
3124 | } |
3125 | ||
3126 | static struct pernet_operations ipmr_net_ops = { | |
3127 | .init = ipmr_net_init, | |
3128 | .exit = ipmr_net_exit, | |
3129 | }; | |
e905a9ed | 3130 | |
03d2f897 | 3131 | int __init ip_mr_init(void) |
1da177e4 | 3132 | { |
03d2f897 WC |
3133 | int err; |
3134 | ||
1da177e4 LT |
3135 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
3136 | sizeof(struct mfc_cache), | |
a8c9486b | 3137 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 3138 | NULL); |
03d2f897 | 3139 | |
cf958ae3 BT |
3140 | err = register_pernet_subsys(&ipmr_net_ops); |
3141 | if (err) | |
3142 | goto reg_pernet_fail; | |
3143 | ||
03d2f897 WC |
3144 | err = register_netdevice_notifier(&ip_mr_notifier); |
3145 | if (err) | |
3146 | goto reg_notif_fail; | |
403dbb97 TG |
3147 | #ifdef CONFIG_IP_PIMSM_V2 |
3148 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 3149 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
3150 | err = -EAGAIN; |
3151 | goto add_proto_fail; | |
3152 | } | |
3153 | #endif | |
c7ac8679 | 3154 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
b97bac64 | 3155 | ipmr_rtm_getroute, ipmr_rtm_dumproute, 0); |
ccbb0aa6 | 3156 | rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, |
b97bac64 | 3157 | ipmr_rtm_route, NULL, 0); |
ccbb0aa6 | 3158 | rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, |
b97bac64 | 3159 | ipmr_rtm_route, NULL, 0); |
772c344d NA |
3160 | |
3161 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK, | |
b97bac64 | 3162 | NULL, ipmr_rtm_dumplink, 0); |
03d2f897 | 3163 | return 0; |
f6bb4514 | 3164 | |
403dbb97 TG |
3165 | #ifdef CONFIG_IP_PIMSM_V2 |
3166 | add_proto_fail: | |
3167 | unregister_netdevice_notifier(&ip_mr_notifier); | |
3168 | #endif | |
c3e38896 | 3169 | reg_notif_fail: |
cf958ae3 BT |
3170 | unregister_pernet_subsys(&ipmr_net_ops); |
3171 | reg_pernet_fail: | |
c3e38896 | 3172 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 3173 | return err; |
1da177e4 | 3174 | } |