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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
113aa838 | 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * Linux Consultancy and Custom Driver Development |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
1da177e4 LT |
12 | * Fixes: |
13 | * Michael Chastain : Incorrect size of copying. | |
14 | * Alan Cox : Added the cache manager code | |
15 | * Alan Cox : Fixed the clone/copy bug and device race. | |
16 | * Mike McLagan : Routing by source | |
17 | * Malcolm Beattie : Buffer handling fixes. | |
18 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
19 | * SVR Anand : Fixed several multicast bugs and problems. | |
20 | * Alexey Kuznetsov : Status, optimisations and more. | |
21 | * Brad Parker : Better behaviour on mrouted upcall | |
22 | * overflow. | |
23 | * Carlos Picoto : PIMv1 Support | |
24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
f77f13e2 | 25 | * Relax this requirement to work with older peers. |
1da177e4 LT |
26 | * |
27 | */ | |
28 | ||
7c0f6ba6 | 29 | #include <linux/uaccess.h> |
1da177e4 | 30 | #include <linux/types.h> |
4fc268d2 | 31 | #include <linux/capability.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/timer.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/stat.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/in.h> | |
40 | #include <linux/inet.h> | |
41 | #include <linux/netdevice.h> | |
42 | #include <linux/inetdevice.h> | |
43 | #include <linux/igmp.h> | |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/seq_file.h> | |
46 | #include <linux/mroute.h> | |
47 | #include <linux/init.h> | |
46f25dff | 48 | #include <linux/if_ether.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
457c4cbc | 50 | #include <net/net_namespace.h> |
1da177e4 LT |
51 | #include <net/ip.h> |
52 | #include <net/protocol.h> | |
53 | #include <linux/skbuff.h> | |
14c85021 | 54 | #include <net/route.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/icmp.h> | |
57 | #include <net/udp.h> | |
58 | #include <net/raw.h> | |
59 | #include <linux/notifier.h> | |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/netfilter_ipv4.h> | |
709b46e8 | 62 | #include <linux/compat.h> |
bc3b2d7f | 63 | #include <linux/export.h> |
c5441932 | 64 | #include <net/ip_tunnels.h> |
1da177e4 | 65 | #include <net/checksum.h> |
dc5fc579 | 66 | #include <net/netlink.h> |
f0ad0860 | 67 | #include <net/fib_rules.h> |
d67b8c61 | 68 | #include <linux/netconf.h> |
ccbb0aa6 | 69 | #include <net/nexthop.h> |
1da177e4 | 70 | |
f0ad0860 PM |
71 | struct ipmr_rule { |
72 | struct fib_rule common; | |
73 | }; | |
74 | ||
75 | struct ipmr_result { | |
76 | struct mr_table *mrt; | |
77 | }; | |
78 | ||
1da177e4 | 79 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 80 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
81 | */ |
82 | ||
83 | static DEFINE_RWLOCK(mrt_lock); | |
84 | ||
7ef8f65d | 85 | /* Multicast router control variables */ |
1da177e4 | 86 | |
1da177e4 LT |
87 | /* Special spinlock for queue of unresolved entries */ |
88 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
89 | ||
90 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
91 | * entries is changed only in process context and protected |
92 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
93 | * with strong spinlock mfc_unres_lock. | |
94 | * | |
95 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
96 | */ |
97 | ||
e18b890b | 98 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 99 | |
f0ad0860 | 100 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
101 | static void ipmr_free_table(struct mr_table *mrt); |
102 | ||
c4854ec8 | 103 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 DS |
104 | struct net_device *dev, struct sk_buff *skb, |
105 | struct mfc_cache *cache, int local); | |
0c12295a | 106 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 107 | struct sk_buff *pkt, vifi_t vifi, int assert); |
cb6a4e46 PM |
108 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
109 | struct mfc_cache *c, struct rtmsg *rtm); | |
8cd3ac9f ND |
110 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
111 | int cmd); | |
5a645dd8 | 112 | static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt); |
0e615e96 | 113 | static void mroute_clean_tables(struct mr_table *mrt, bool all); |
f0ad0860 PM |
114 | static void ipmr_expire_process(unsigned long arg); |
115 | ||
116 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
117 | #define ipmr_for_each_table(mrt, net) \ | |
118 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
119 | ||
120 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
121 | { | |
122 | struct mr_table *mrt; | |
123 | ||
124 | ipmr_for_each_table(mrt, net) { | |
125 | if (mrt->id == id) | |
126 | return mrt; | |
127 | } | |
128 | return NULL; | |
129 | } | |
130 | ||
da91981b | 131 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
132 | struct mr_table **mrt) |
133 | { | |
f0ad0860 | 134 | int err; |
95f4a45d HFS |
135 | struct ipmr_result res; |
136 | struct fib_lookup_arg arg = { | |
137 | .result = &res, | |
138 | .flags = FIB_LOOKUP_NOREF, | |
139 | }; | |
f0ad0860 | 140 | |
e58e4159 DA |
141 | /* update flow if oif or iif point to device enslaved to l3mdev */ |
142 | l3mdev_update_flow(net, flowi4_to_flowi(flp4)); | |
143 | ||
da91981b DM |
144 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
145 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
146 | if (err < 0) |
147 | return err; | |
148 | *mrt = res.mrt; | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
153 | int flags, struct fib_lookup_arg *arg) | |
154 | { | |
155 | struct ipmr_result *res = arg->result; | |
156 | struct mr_table *mrt; | |
1da177e4 | 157 | |
f0ad0860 PM |
158 | switch (rule->action) { |
159 | case FR_ACT_TO_TBL: | |
160 | break; | |
161 | case FR_ACT_UNREACHABLE: | |
162 | return -ENETUNREACH; | |
163 | case FR_ACT_PROHIBIT: | |
164 | return -EACCES; | |
165 | case FR_ACT_BLACKHOLE: | |
166 | default: | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
e58e4159 DA |
170 | arg->table = fib_rule_get_table(rule, arg); |
171 | ||
172 | mrt = ipmr_get_table(rule->fr_net, arg->table); | |
51456b29 | 173 | if (!mrt) |
f0ad0860 PM |
174 | return -EAGAIN; |
175 | res->mrt = mrt; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
180 | { | |
181 | return 1; | |
182 | } | |
183 | ||
184 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
185 | FRA_GENERIC_POLICY, | |
186 | }; | |
187 | ||
188 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
189 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
190 | { | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
195 | struct nlattr **tb) | |
196 | { | |
197 | return 1; | |
198 | } | |
199 | ||
200 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
201 | struct fib_rule_hdr *frh) | |
202 | { | |
203 | frh->dst_len = 0; | |
204 | frh->src_len = 0; | |
205 | frh->tos = 0; | |
206 | return 0; | |
207 | } | |
208 | ||
04a6f82c | 209 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 210 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
211 | .rule_size = sizeof(struct ipmr_rule), |
212 | .addr_size = sizeof(u32), | |
213 | .action = ipmr_rule_action, | |
214 | .match = ipmr_rule_match, | |
215 | .configure = ipmr_rule_configure, | |
216 | .compare = ipmr_rule_compare, | |
f0ad0860 PM |
217 | .fill = ipmr_rule_fill, |
218 | .nlgroup = RTNLGRP_IPV4_RULE, | |
219 | .policy = ipmr_rule_policy, | |
220 | .owner = THIS_MODULE, | |
221 | }; | |
222 | ||
223 | static int __net_init ipmr_rules_init(struct net *net) | |
224 | { | |
225 | struct fib_rules_ops *ops; | |
226 | struct mr_table *mrt; | |
227 | int err; | |
228 | ||
229 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
230 | if (IS_ERR(ops)) | |
231 | return PTR_ERR(ops); | |
232 | ||
233 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
234 | ||
235 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
1113ebbc NA |
236 | if (IS_ERR(mrt)) { |
237 | err = PTR_ERR(mrt); | |
f0ad0860 PM |
238 | goto err1; |
239 | } | |
240 | ||
241 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
242 | if (err < 0) | |
243 | goto err2; | |
244 | ||
245 | net->ipv4.mr_rules_ops = ops; | |
246 | return 0; | |
247 | ||
248 | err2: | |
f243e5a7 | 249 | ipmr_free_table(mrt); |
f0ad0860 PM |
250 | err1: |
251 | fib_rules_unregister(ops); | |
252 | return err; | |
253 | } | |
254 | ||
255 | static void __net_exit ipmr_rules_exit(struct net *net) | |
256 | { | |
257 | struct mr_table *mrt, *next; | |
258 | ||
ed785309 | 259 | rtnl_lock(); |
035320d5 ED |
260 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
261 | list_del(&mrt->list); | |
acbb219d | 262 | ipmr_free_table(mrt); |
035320d5 | 263 | } |
f0ad0860 | 264 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
419df12f | 265 | rtnl_unlock(); |
f0ad0860 PM |
266 | } |
267 | #else | |
268 | #define ipmr_for_each_table(mrt, net) \ | |
269 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
270 | ||
271 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
272 | { | |
273 | return net->ipv4.mrt; | |
274 | } | |
275 | ||
da91981b | 276 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
277 | struct mr_table **mrt) |
278 | { | |
279 | *mrt = net->ipv4.mrt; | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static int __net_init ipmr_rules_init(struct net *net) | |
284 | { | |
1113ebbc NA |
285 | struct mr_table *mrt; |
286 | ||
287 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
288 | if (IS_ERR(mrt)) | |
289 | return PTR_ERR(mrt); | |
290 | net->ipv4.mrt = mrt; | |
291 | return 0; | |
f0ad0860 PM |
292 | } |
293 | ||
294 | static void __net_exit ipmr_rules_exit(struct net *net) | |
295 | { | |
ed785309 | 296 | rtnl_lock(); |
acbb219d | 297 | ipmr_free_table(net->ipv4.mrt); |
ed785309 WC |
298 | net->ipv4.mrt = NULL; |
299 | rtnl_unlock(); | |
f0ad0860 PM |
300 | } |
301 | #endif | |
302 | ||
8fb472c0 NA |
303 | static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, |
304 | const void *ptr) | |
305 | { | |
306 | const struct mfc_cache_cmp_arg *cmparg = arg->key; | |
307 | struct mfc_cache *c = (struct mfc_cache *)ptr; | |
308 | ||
309 | return cmparg->mfc_mcastgrp != c->mfc_mcastgrp || | |
310 | cmparg->mfc_origin != c->mfc_origin; | |
311 | } | |
312 | ||
313 | static const struct rhashtable_params ipmr_rht_params = { | |
314 | .head_offset = offsetof(struct mfc_cache, mnode), | |
315 | .key_offset = offsetof(struct mfc_cache, cmparg), | |
316 | .key_len = sizeof(struct mfc_cache_cmp_arg), | |
317 | .nelem_hint = 3, | |
318 | .locks_mul = 1, | |
319 | .obj_cmpfn = ipmr_hash_cmp, | |
320 | .automatic_shrinking = true, | |
321 | }; | |
322 | ||
f0ad0860 PM |
323 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) |
324 | { | |
325 | struct mr_table *mrt; | |
1da177e4 | 326 | |
1113ebbc NA |
327 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
328 | if (id != RT_TABLE_DEFAULT && id >= 1000000000) | |
329 | return ERR_PTR(-EINVAL); | |
330 | ||
f0ad0860 | 331 | mrt = ipmr_get_table(net, id); |
00db4124 | 332 | if (mrt) |
f0ad0860 PM |
333 | return mrt; |
334 | ||
335 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
51456b29 | 336 | if (!mrt) |
1113ebbc | 337 | return ERR_PTR(-ENOMEM); |
8de53dfb | 338 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
339 | mrt->id = id; |
340 | ||
8fb472c0 NA |
341 | rhltable_init(&mrt->mfc_hash, &ipmr_rht_params); |
342 | INIT_LIST_HEAD(&mrt->mfc_cache_list); | |
f0ad0860 PM |
343 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); |
344 | ||
345 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
346 | (unsigned long)mrt); | |
347 | ||
f0ad0860 | 348 | mrt->mroute_reg_vif_num = -1; |
f0ad0860 PM |
349 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES |
350 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
351 | #endif | |
352 | return mrt; | |
353 | } | |
1da177e4 | 354 | |
acbb219d FR |
355 | static void ipmr_free_table(struct mr_table *mrt) |
356 | { | |
357 | del_timer_sync(&mrt->ipmr_expire_timer); | |
0e615e96 | 358 | mroute_clean_tables(mrt, true); |
8fb472c0 | 359 | rhltable_destroy(&mrt->mfc_hash); |
acbb219d FR |
360 | kfree(mrt); |
361 | } | |
362 | ||
1da177e4 LT |
363 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
364 | ||
d607032d WC |
365 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
366 | { | |
4feb88e5 BT |
367 | struct net *net = dev_net(dev); |
368 | ||
d607032d WC |
369 | dev_close(dev); |
370 | ||
4feb88e5 | 371 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 372 | if (dev) { |
5bc3eb7e | 373 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 374 | struct ifreq ifr; |
d607032d WC |
375 | struct ip_tunnel_parm p; |
376 | ||
377 | memset(&p, 0, sizeof(p)); | |
378 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
379 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
380 | p.iph.version = 4; | |
381 | p.iph.ihl = 5; | |
382 | p.iph.protocol = IPPROTO_IPIP; | |
383 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
384 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
385 | ||
5bc3eb7e SH |
386 | if (ops->ndo_do_ioctl) { |
387 | mm_segment_t oldfs = get_fs(); | |
388 | ||
389 | set_fs(KERNEL_DS); | |
390 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
391 | set_fs(oldfs); | |
392 | } | |
d607032d WC |
393 | } |
394 | } | |
395 | ||
a0b47736 NA |
396 | /* Initialize ipmr pimreg/tunnel in_device */ |
397 | static bool ipmr_init_vif_indev(const struct net_device *dev) | |
398 | { | |
399 | struct in_device *in_dev; | |
400 | ||
401 | ASSERT_RTNL(); | |
402 | ||
403 | in_dev = __in_dev_get_rtnl(dev); | |
404 | if (!in_dev) | |
405 | return false; | |
406 | ipv4_devconf_setall(in_dev); | |
407 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
408 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
409 | ||
410 | return true; | |
411 | } | |
412 | ||
7ef8f65d | 413 | static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
414 | { |
415 | struct net_device *dev; | |
416 | ||
4feb88e5 | 417 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
418 | |
419 | if (dev) { | |
5bc3eb7e | 420 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
421 | int err; |
422 | struct ifreq ifr; | |
1da177e4 | 423 | struct ip_tunnel_parm p; |
1da177e4 LT |
424 | |
425 | memset(&p, 0, sizeof(p)); | |
426 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
427 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
428 | p.iph.version = 4; | |
429 | p.iph.ihl = 5; | |
430 | p.iph.protocol = IPPROTO_IPIP; | |
431 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 432 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 433 | |
5bc3eb7e SH |
434 | if (ops->ndo_do_ioctl) { |
435 | mm_segment_t oldfs = get_fs(); | |
436 | ||
437 | set_fs(KERNEL_DS); | |
438 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
439 | set_fs(oldfs); | |
a8cb16dd | 440 | } else { |
5bc3eb7e | 441 | err = -EOPNOTSUPP; |
a8cb16dd | 442 | } |
1da177e4 LT |
443 | dev = NULL; |
444 | ||
4feb88e5 BT |
445 | if (err == 0 && |
446 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 | 447 | dev->flags |= IFF_MULTICAST; |
a0b47736 | 448 | if (!ipmr_init_vif_indev(dev)) |
1da177e4 | 449 | goto failure; |
1da177e4 LT |
450 | if (dev_open(dev)) |
451 | goto failure; | |
7dc00c82 | 452 | dev_hold(dev); |
1da177e4 LT |
453 | } |
454 | } | |
455 | return dev; | |
456 | ||
457 | failure: | |
1da177e4 LT |
458 | unregister_netdevice(dev); |
459 | return NULL; | |
460 | } | |
461 | ||
c316c629 | 462 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
6fef4c0c | 463 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 464 | { |
4feb88e5 | 465 | struct net *net = dev_net(dev); |
f0ad0860 | 466 | struct mr_table *mrt; |
da91981b DM |
467 | struct flowi4 fl4 = { |
468 | .flowi4_oif = dev->ifindex, | |
6a662719 | 469 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
da91981b | 470 | .flowi4_mark = skb->mark, |
f0ad0860 PM |
471 | }; |
472 | int err; | |
473 | ||
da91981b | 474 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
475 | if (err < 0) { |
476 | kfree_skb(skb); | |
f0ad0860 | 477 | return err; |
e40dbc51 | 478 | } |
4feb88e5 | 479 | |
1da177e4 | 480 | read_lock(&mrt_lock); |
cf3677ae PE |
481 | dev->stats.tx_bytes += skb->len; |
482 | dev->stats.tx_packets++; | |
0c12295a | 483 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
484 | read_unlock(&mrt_lock); |
485 | kfree_skb(skb); | |
6ed10654 | 486 | return NETDEV_TX_OK; |
1da177e4 LT |
487 | } |
488 | ||
ee9b9596 ND |
489 | static int reg_vif_get_iflink(const struct net_device *dev) |
490 | { | |
491 | return 0; | |
492 | } | |
493 | ||
007c3838 SH |
494 | static const struct net_device_ops reg_vif_netdev_ops = { |
495 | .ndo_start_xmit = reg_vif_xmit, | |
ee9b9596 | 496 | .ndo_get_iflink = reg_vif_get_iflink, |
007c3838 SH |
497 | }; |
498 | ||
1da177e4 LT |
499 | static void reg_vif_setup(struct net_device *dev) |
500 | { | |
501 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 502 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 503 | dev->flags = IFF_NOARP; |
70cb4a45 | 504 | dev->netdev_ops = ®_vif_netdev_ops; |
cf124db5 | 505 | dev->needs_free_netdev = true; |
403dbb97 | 506 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
507 | } |
508 | ||
f0ad0860 | 509 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
510 | { |
511 | struct net_device *dev; | |
f0ad0860 | 512 | char name[IFNAMSIZ]; |
1da177e4 | 513 | |
f0ad0860 PM |
514 | if (mrt->id == RT_TABLE_DEFAULT) |
515 | sprintf(name, "pimreg"); | |
516 | else | |
517 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 518 | |
c835a677 | 519 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
1da177e4 | 520 | |
51456b29 | 521 | if (!dev) |
1da177e4 LT |
522 | return NULL; |
523 | ||
403dbb97 TG |
524 | dev_net_set(dev, net); |
525 | ||
1da177e4 LT |
526 | if (register_netdevice(dev)) { |
527 | free_netdev(dev); | |
528 | return NULL; | |
529 | } | |
1da177e4 | 530 | |
a0b47736 | 531 | if (!ipmr_init_vif_indev(dev)) |
1da177e4 | 532 | goto failure; |
1da177e4 LT |
533 | if (dev_open(dev)) |
534 | goto failure; | |
535 | ||
7dc00c82 WC |
536 | dev_hold(dev); |
537 | ||
1da177e4 LT |
538 | return dev; |
539 | ||
540 | failure: | |
1da177e4 LT |
541 | unregister_netdevice(dev); |
542 | return NULL; | |
543 | } | |
c316c629 NA |
544 | |
545 | /* called with rcu_read_lock() */ | |
546 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, | |
547 | unsigned int pimlen) | |
548 | { | |
549 | struct net_device *reg_dev = NULL; | |
550 | struct iphdr *encap; | |
551 | ||
552 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); | |
7ef8f65d | 553 | /* Check that: |
c316c629 NA |
554 | * a. packet is really sent to a multicast group |
555 | * b. packet is not a NULL-REGISTER | |
556 | * c. packet is not truncated | |
557 | */ | |
558 | if (!ipv4_is_multicast(encap->daddr) || | |
559 | encap->tot_len == 0 || | |
560 | ntohs(encap->tot_len) + pimlen > skb->len) | |
561 | return 1; | |
562 | ||
563 | read_lock(&mrt_lock); | |
564 | if (mrt->mroute_reg_vif_num >= 0) | |
565 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
566 | read_unlock(&mrt_lock); | |
567 | ||
568 | if (!reg_dev) | |
569 | return 1; | |
570 | ||
571 | skb->mac_header = skb->network_header; | |
572 | skb_pull(skb, (u8 *)encap - skb->data); | |
573 | skb_reset_network_header(skb); | |
574 | skb->protocol = htons(ETH_P_IP); | |
575 | skb->ip_summed = CHECKSUM_NONE; | |
576 | ||
577 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); | |
578 | ||
579 | netif_rx(skb); | |
580 | ||
581 | return NET_RX_SUCCESS; | |
582 | } | |
583 | #else | |
584 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) | |
585 | { | |
586 | return NULL; | |
587 | } | |
1da177e4 LT |
588 | #endif |
589 | ||
2c53040f BH |
590 | /** |
591 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 592 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 593 | */ |
0c12295a | 594 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 595 | struct list_head *head) |
1da177e4 LT |
596 | { |
597 | struct vif_device *v; | |
598 | struct net_device *dev; | |
599 | struct in_device *in_dev; | |
600 | ||
0c12295a | 601 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
602 | return -EADDRNOTAVAIL; |
603 | ||
0c12295a | 604 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
605 | |
606 | write_lock_bh(&mrt_lock); | |
607 | dev = v->dev; | |
608 | v->dev = NULL; | |
609 | ||
610 | if (!dev) { | |
611 | write_unlock_bh(&mrt_lock); | |
612 | return -EADDRNOTAVAIL; | |
613 | } | |
614 | ||
0c12295a PM |
615 | if (vifi == mrt->mroute_reg_vif_num) |
616 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 | 617 | |
a8cb16dd | 618 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 619 | int tmp; |
a8cb16dd ED |
620 | |
621 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 622 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
623 | break; |
624 | } | |
0c12295a | 625 | mrt->maxvif = tmp+1; |
1da177e4 LT |
626 | } |
627 | ||
628 | write_unlock_bh(&mrt_lock); | |
629 | ||
630 | dev_set_allmulti(dev, -1); | |
631 | ||
a8cb16dd ED |
632 | in_dev = __in_dev_get_rtnl(dev); |
633 | if (in_dev) { | |
42f811b8 | 634 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
3b022865 | 635 | inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, |
d67b8c61 ND |
636 | NETCONFA_MC_FORWARDING, |
637 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
638 | ip_rt_multicast_event(in_dev); |
639 | } | |
640 | ||
a8cb16dd | 641 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 642 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
643 | |
644 | dev_put(dev); | |
645 | return 0; | |
646 | } | |
647 | ||
a8c9486b | 648 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 649 | { |
a8c9486b ED |
650 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
651 | ||
5c0a66f5 BT |
652 | kmem_cache_free(mrt_cachep, c); |
653 | } | |
654 | ||
310ebbba | 655 | void ipmr_cache_free(struct mfc_cache *c) |
a8c9486b ED |
656 | { |
657 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
658 | } | |
310ebbba | 659 | EXPORT_SYMBOL(ipmr_cache_free); |
a8c9486b | 660 | |
1da177e4 | 661 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 662 | * and reporting error to netlink readers. |
1da177e4 | 663 | */ |
0c12295a | 664 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 665 | { |
8de53dfb | 666 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 667 | struct sk_buff *skb; |
9ef1d4c7 | 668 | struct nlmsgerr *e; |
1da177e4 | 669 | |
0c12295a | 670 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 671 | |
c354e124 | 672 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 673 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
674 | struct nlmsghdr *nlh = skb_pull(skb, |
675 | sizeof(struct iphdr)); | |
1da177e4 | 676 | nlh->nlmsg_type = NLMSG_ERROR; |
573ce260 | 677 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 678 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 679 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
680 | e->error = -ETIMEDOUT; |
681 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 682 | |
15e47304 | 683 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 684 | } else { |
1da177e4 | 685 | kfree_skb(skb); |
a8cb16dd | 686 | } |
1da177e4 LT |
687 | } |
688 | ||
5c0a66f5 | 689 | ipmr_cache_free(c); |
1da177e4 LT |
690 | } |
691 | ||
e258beb2 | 692 | /* Timer process for the unresolved queue. */ |
e258beb2 | 693 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 694 | { |
0c12295a | 695 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
696 | unsigned long now; |
697 | unsigned long expires; | |
862465f2 | 698 | struct mfc_cache *c, *next; |
1da177e4 LT |
699 | |
700 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 701 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
702 | return; |
703 | } | |
704 | ||
0c12295a | 705 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
706 | goto out; |
707 | ||
708 | now = jiffies; | |
709 | expires = 10*HZ; | |
1da177e4 | 710 | |
0c12295a | 711 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
712 | if (time_after(c->mfc_un.unres.expires, now)) { |
713 | unsigned long interval = c->mfc_un.unres.expires - now; | |
714 | if (interval < expires) | |
715 | expires = interval; | |
1da177e4 LT |
716 | continue; |
717 | } | |
718 | ||
862465f2 | 719 | list_del(&c->list); |
8cd3ac9f | 720 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 721 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
722 | } |
723 | ||
0c12295a PM |
724 | if (!list_empty(&mrt->mfc_unres_queue)) |
725 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
726 | |
727 | out: | |
728 | spin_unlock(&mfc_unres_lock); | |
729 | } | |
730 | ||
731 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
0c12295a | 732 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 733 | unsigned char *ttls) |
1da177e4 LT |
734 | { |
735 | int vifi; | |
736 | ||
737 | cache->mfc_un.res.minvif = MAXVIFS; | |
738 | cache->mfc_un.res.maxvif = 0; | |
739 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
740 | ||
0c12295a PM |
741 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
742 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 743 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
744 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
745 | if (cache->mfc_un.res.minvif > vifi) | |
746 | cache->mfc_un.res.minvif = vifi; | |
747 | if (cache->mfc_un.res.maxvif <= vifi) | |
748 | cache->mfc_un.res.maxvif = vifi + 1; | |
749 | } | |
750 | } | |
90b5ca17 | 751 | cache->mfc_un.res.lastuse = jiffies; |
1da177e4 LT |
752 | } |
753 | ||
0c12295a PM |
754 | static int vif_add(struct net *net, struct mr_table *mrt, |
755 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
756 | { |
757 | int vifi = vifc->vifc_vifi; | |
0c12295a | 758 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
759 | struct net_device *dev; |
760 | struct in_device *in_dev; | |
d607032d | 761 | int err; |
1da177e4 LT |
762 | |
763 | /* Is vif busy ? */ | |
0c12295a | 764 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
765 | return -EADDRINUSE; |
766 | ||
767 | switch (vifc->vifc_flags) { | |
1da177e4 | 768 | case VIFF_REGISTER: |
1973a4ea | 769 | if (!ipmr_pimsm_enabled()) |
c316c629 NA |
770 | return -EINVAL; |
771 | /* Special Purpose VIF in PIM | |
1da177e4 LT |
772 | * All the packets will be sent to the daemon |
773 | */ | |
0c12295a | 774 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 775 | return -EADDRINUSE; |
f0ad0860 | 776 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
777 | if (!dev) |
778 | return -ENOBUFS; | |
d607032d WC |
779 | err = dev_set_allmulti(dev, 1); |
780 | if (err) { | |
781 | unregister_netdevice(dev); | |
7dc00c82 | 782 | dev_put(dev); |
d607032d WC |
783 | return err; |
784 | } | |
1da177e4 | 785 | break; |
e905a9ed | 786 | case VIFF_TUNNEL: |
4feb88e5 | 787 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
788 | if (!dev) |
789 | return -ENOBUFS; | |
d607032d WC |
790 | err = dev_set_allmulti(dev, 1); |
791 | if (err) { | |
792 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 793 | dev_put(dev); |
d607032d WC |
794 | return err; |
795 | } | |
1da177e4 | 796 | break; |
ee5e81f0 | 797 | case VIFF_USE_IFINDEX: |
1da177e4 | 798 | case 0: |
ee5e81f0 I |
799 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
800 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
51456b29 | 801 | if (dev && !__in_dev_get_rtnl(dev)) { |
ee5e81f0 I |
802 | dev_put(dev); |
803 | return -EADDRNOTAVAIL; | |
804 | } | |
a8cb16dd | 805 | } else { |
ee5e81f0 | 806 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 807 | } |
1da177e4 LT |
808 | if (!dev) |
809 | return -EADDRNOTAVAIL; | |
d607032d | 810 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
811 | if (err) { |
812 | dev_put(dev); | |
d607032d | 813 | return err; |
7dc00c82 | 814 | } |
1da177e4 LT |
815 | break; |
816 | default: | |
817 | return -EINVAL; | |
818 | } | |
819 | ||
a8cb16dd ED |
820 | in_dev = __in_dev_get_rtnl(dev); |
821 | if (!in_dev) { | |
d0490cfd | 822 | dev_put(dev); |
1da177e4 | 823 | return -EADDRNOTAVAIL; |
d0490cfd | 824 | } |
42f811b8 | 825 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
3b022865 DA |
826 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING, |
827 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
828 | ip_rt_multicast_event(in_dev); |
829 | ||
a8cb16dd ED |
830 | /* Fill in the VIF structures */ |
831 | ||
c354e124 JK |
832 | v->rate_limit = vifc->vifc_rate_limit; |
833 | v->local = vifc->vifc_lcl_addr.s_addr; | |
834 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
835 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
836 | if (!mrtsock) |
837 | v->flags |= VIFF_STATIC; | |
c354e124 | 838 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
839 | v->bytes_in = 0; |
840 | v->bytes_out = 0; | |
841 | v->pkt_in = 0; | |
842 | v->pkt_out = 0; | |
843 | v->link = dev->ifindex; | |
a8cb16dd | 844 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
a54acb3a | 845 | v->link = dev_get_iflink(dev); |
1da177e4 LT |
846 | |
847 | /* And finish update writing critical data */ | |
848 | write_lock_bh(&mrt_lock); | |
c354e124 | 849 | v->dev = dev; |
a8cb16dd | 850 | if (v->flags & VIFF_REGISTER) |
0c12295a | 851 | mrt->mroute_reg_vif_num = vifi; |
0c12295a PM |
852 | if (vifi+1 > mrt->maxvif) |
853 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
854 | write_unlock_bh(&mrt_lock); |
855 | return 0; | |
856 | } | |
857 | ||
a8c9486b | 858 | /* called with rcu_read_lock() */ |
0c12295a | 859 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
860 | __be32 origin, |
861 | __be32 mcastgrp) | |
1da177e4 | 862 | { |
8fb472c0 NA |
863 | struct mfc_cache_cmp_arg arg = { |
864 | .mfc_mcastgrp = mcastgrp, | |
865 | .mfc_origin = origin | |
866 | }; | |
867 | struct rhlist_head *tmp, *list; | |
1da177e4 LT |
868 | struct mfc_cache *c; |
869 | ||
8fb472c0 NA |
870 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); |
871 | rhl_for_each_entry_rcu(c, tmp, list, mnode) | |
872 | return c; | |
873 | ||
862465f2 | 874 | return NULL; |
1da177e4 LT |
875 | } |
876 | ||
660b26dc ND |
877 | /* Look for a (*,*,oif) entry */ |
878 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, | |
879 | int vifi) | |
880 | { | |
8fb472c0 NA |
881 | struct mfc_cache_cmp_arg arg = { |
882 | .mfc_mcastgrp = htonl(INADDR_ANY), | |
883 | .mfc_origin = htonl(INADDR_ANY) | |
884 | }; | |
885 | struct rhlist_head *tmp, *list; | |
660b26dc ND |
886 | struct mfc_cache *c; |
887 | ||
8fb472c0 NA |
888 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); |
889 | rhl_for_each_entry_rcu(c, tmp, list, mnode) | |
890 | if (c->mfc_un.res.ttls[vifi] < 255) | |
660b26dc ND |
891 | return c; |
892 | ||
893 | return NULL; | |
894 | } | |
895 | ||
896 | /* Look for a (*,G) entry */ | |
897 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
898 | __be32 mcastgrp, int vifi) | |
899 | { | |
8fb472c0 NA |
900 | struct mfc_cache_cmp_arg arg = { |
901 | .mfc_mcastgrp = mcastgrp, | |
902 | .mfc_origin = htonl(INADDR_ANY) | |
903 | }; | |
904 | struct rhlist_head *tmp, *list; | |
660b26dc ND |
905 | struct mfc_cache *c, *proxy; |
906 | ||
360eb5da | 907 | if (mcastgrp == htonl(INADDR_ANY)) |
660b26dc ND |
908 | goto skip; |
909 | ||
8fb472c0 NA |
910 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); |
911 | rhl_for_each_entry_rcu(c, tmp, list, mnode) { | |
912 | if (c->mfc_un.res.ttls[vifi] < 255) | |
913 | return c; | |
914 | ||
915 | /* It's ok if the vifi is part of the static tree */ | |
916 | proxy = ipmr_cache_find_any_parent(mrt, c->mfc_parent); | |
917 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) | |
918 | return c; | |
919 | } | |
660b26dc ND |
920 | |
921 | skip: | |
922 | return ipmr_cache_find_any_parent(mrt, vifi); | |
923 | } | |
924 | ||
8fb472c0 NA |
925 | /* Look for a (S,G,iif) entry if parent != -1 */ |
926 | static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt, | |
927 | __be32 origin, __be32 mcastgrp, | |
928 | int parent) | |
929 | { | |
930 | struct mfc_cache_cmp_arg arg = { | |
931 | .mfc_mcastgrp = mcastgrp, | |
932 | .mfc_origin = origin, | |
933 | }; | |
934 | struct rhlist_head *tmp, *list; | |
935 | struct mfc_cache *c; | |
936 | ||
937 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); | |
938 | rhl_for_each_entry_rcu(c, tmp, list, mnode) | |
939 | if (parent == -1 || parent == c->mfc_parent) | |
940 | return c; | |
941 | ||
942 | return NULL; | |
943 | } | |
944 | ||
7ef8f65d | 945 | /* Allocate a multicast cache entry */ |
d658f8a0 | 946 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 947 | { |
c354e124 | 948 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b | 949 | |
70a0dec4 TG |
950 | if (c) { |
951 | c->mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; | |
a8c9486b | 952 | c->mfc_un.res.minvif = MAXVIFS; |
310ebbba | 953 | refcount_set(&c->mfc_un.res.refcount, 1); |
70a0dec4 | 954 | } |
1da177e4 LT |
955 | return c; |
956 | } | |
957 | ||
d658f8a0 | 958 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 959 | { |
c354e124 | 960 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
961 | |
962 | if (c) { | |
963 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
964 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
965 | } | |
1da177e4 LT |
966 | return c; |
967 | } | |
968 | ||
7ef8f65d | 969 | /* A cache entry has gone into a resolved state from queued */ |
0c12295a PM |
970 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
971 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
972 | { |
973 | struct sk_buff *skb; | |
9ef1d4c7 | 974 | struct nlmsgerr *e; |
1da177e4 | 975 | |
a8cb16dd | 976 | /* Play the pending entries through our router */ |
c354e124 | 977 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 978 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
979 | struct nlmsghdr *nlh = skb_pull(skb, |
980 | sizeof(struct iphdr)); | |
1da177e4 | 981 | |
573ce260 | 982 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
a8cb16dd ED |
983 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
984 | (u8 *)nlh; | |
1da177e4 LT |
985 | } else { |
986 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 987 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 988 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 989 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
990 | e->error = -EMSGSIZE; |
991 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 992 | } |
2942e900 | 993 | |
15e47304 | 994 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 995 | } else { |
4b1f0d33 | 996 | ip_mr_forward(net, mrt, skb->dev, skb, c, 0); |
a8cb16dd | 997 | } |
1da177e4 LT |
998 | } |
999 | } | |
1000 | ||
5a645dd8 | 1001 | /* Bounce a cache query up to mrouted and netlink. |
1da177e4 | 1002 | * |
c316c629 | 1003 | * Called under mrt_lock. |
1da177e4 | 1004 | */ |
0c12295a | 1005 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 1006 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 | 1007 | { |
c9bdd4b5 | 1008 | const int ihl = ip_hdrlen(pkt); |
c316c629 | 1009 | struct sock *mroute_sk; |
1da177e4 LT |
1010 | struct igmphdr *igmp; |
1011 | struct igmpmsg *msg; | |
c316c629 | 1012 | struct sk_buff *skb; |
1da177e4 LT |
1013 | int ret; |
1014 | ||
1da177e4 LT |
1015 | if (assert == IGMPMSG_WHOLEPKT) |
1016 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
1017 | else | |
1da177e4 LT |
1018 | skb = alloc_skb(128, GFP_ATOMIC); |
1019 | ||
132adf54 | 1020 | if (!skb) |
1da177e4 LT |
1021 | return -ENOBUFS; |
1022 | ||
1da177e4 LT |
1023 | if (assert == IGMPMSG_WHOLEPKT) { |
1024 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
1025 | * Duplicate old header, fix ihl, length etc. |
1026 | * And all this only to mangle msg->im_msgtype and | |
1027 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 1028 | */ |
878c8145 ACM |
1029 | skb_push(skb, sizeof(struct iphdr)); |
1030 | skb_reset_network_header(skb); | |
badff6d0 | 1031 | skb_reset_transport_header(skb); |
0272ffc4 | 1032 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 1033 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
1034 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
1035 | msg->im_mbz = 0; | |
0c12295a | 1036 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
1037 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
1038 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
1039 | sizeof(struct iphdr)); | |
c316c629 NA |
1040 | } else { |
1041 | /* Copy the IP header */ | |
1042 | skb_set_network_header(skb, skb->len); | |
1043 | skb_put(skb, ihl); | |
1044 | skb_copy_to_linear_data(skb, pkt->data, ihl); | |
1045 | /* Flag to the kernel this is a route add */ | |
1046 | ip_hdr(skb)->protocol = 0; | |
1047 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1048 | msg->im_vif = vifi; | |
1049 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); | |
1050 | /* Add our header */ | |
4df864c1 | 1051 | igmp = skb_put(skb, sizeof(struct igmphdr)); |
c316c629 NA |
1052 | igmp->type = assert; |
1053 | msg->im_msgtype = assert; | |
1054 | igmp->code = 0; | |
1055 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
1056 | skb->transport_header = skb->network_header; | |
e905a9ed | 1057 | } |
1da177e4 | 1058 | |
4c968709 ED |
1059 | rcu_read_lock(); |
1060 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
51456b29 | 1061 | if (!mroute_sk) { |
4c968709 | 1062 | rcu_read_unlock(); |
1da177e4 LT |
1063 | kfree_skb(skb); |
1064 | return -EINVAL; | |
1065 | } | |
1066 | ||
5a645dd8 JG |
1067 | igmpmsg_netlink_event(mrt, skb); |
1068 | ||
a8cb16dd | 1069 | /* Deliver to mrouted */ |
4c968709 ED |
1070 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1071 | rcu_read_unlock(); | |
70a269e6 | 1072 | if (ret < 0) { |
e87cc472 | 1073 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1074 | kfree_skb(skb); |
1075 | } | |
1076 | ||
1077 | return ret; | |
1078 | } | |
1079 | ||
7ef8f65d NA |
1080 | /* Queue a packet for resolution. It gets locked cache entry! */ |
1081 | static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, | |
4b1f0d33 | 1082 | struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 1083 | { |
8fb472c0 NA |
1084 | const struct iphdr *iph = ip_hdr(skb); |
1085 | struct mfc_cache *c; | |
862465f2 | 1086 | bool found = false; |
1da177e4 | 1087 | int err; |
1da177e4 LT |
1088 | |
1089 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1090 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1091 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1092 | c->mfc_origin == iph->saddr) { |
1093 | found = true; | |
1da177e4 | 1094 | break; |
862465f2 | 1095 | } |
1da177e4 LT |
1096 | } |
1097 | ||
862465f2 | 1098 | if (!found) { |
a8cb16dd | 1099 | /* Create a new entry if allowable */ |
0c12295a | 1100 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1101 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1102 | spin_unlock_bh(&mfc_unres_lock); |
1103 | ||
1104 | kfree_skb(skb); | |
1105 | return -ENOBUFS; | |
1106 | } | |
1107 | ||
a8cb16dd | 1108 | /* Fill in the new cache entry */ |
eddc9ec5 ACM |
1109 | c->mfc_parent = -1; |
1110 | c->mfc_origin = iph->saddr; | |
1111 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1112 | |
a8cb16dd | 1113 | /* Reflect first query at mrouted. */ |
0c12295a | 1114 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1115 | if (err < 0) { |
e905a9ed | 1116 | /* If the report failed throw the cache entry |
1da177e4 LT |
1117 | out - Brad Parker |
1118 | */ | |
1119 | spin_unlock_bh(&mfc_unres_lock); | |
1120 | ||
5c0a66f5 | 1121 | ipmr_cache_free(c); |
1da177e4 LT |
1122 | kfree_skb(skb); |
1123 | return err; | |
1124 | } | |
1125 | ||
0c12295a PM |
1126 | atomic_inc(&mrt->cache_resolve_queue_len); |
1127 | list_add(&c->list, &mrt->mfc_unres_queue); | |
8cd3ac9f | 1128 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1129 | |
278554bd DM |
1130 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1131 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1132 | } |
1133 | ||
a8cb16dd | 1134 | /* See if we can append the packet */ |
a8cb16dd | 1135 | if (c->mfc_un.unres.unresolved.qlen > 3) { |
1da177e4 LT |
1136 | kfree_skb(skb); |
1137 | err = -ENOBUFS; | |
1138 | } else { | |
4b1f0d33 DS |
1139 | if (dev) { |
1140 | skb->dev = dev; | |
1141 | skb->skb_iif = dev->ifindex; | |
1142 | } | |
c354e124 | 1143 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1144 | err = 0; |
1145 | } | |
1146 | ||
1147 | spin_unlock_bh(&mfc_unres_lock); | |
1148 | return err; | |
1149 | } | |
1150 | ||
7ef8f65d | 1151 | /* MFC cache manipulation by user space mroute daemon */ |
1da177e4 | 1152 | |
660b26dc | 1153 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 | 1154 | { |
8fb472c0 | 1155 | struct mfc_cache *c; |
1da177e4 | 1156 | |
8fb472c0 NA |
1157 | /* The entries are added/deleted only under RTNL */ |
1158 | rcu_read_lock(); | |
1159 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1160 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1161 | rcu_read_unlock(); | |
1162 | if (!c) | |
1163 | return -ENOENT; | |
1164 | rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); | |
1165 | list_del_rcu(&c->list); | |
1166 | mroute_netlink_event(mrt, c, RTM_DELROUTE); | |
310ebbba | 1167 | ipmr_cache_put(c); |
1da177e4 | 1168 | |
8fb472c0 | 1169 | return 0; |
1da177e4 LT |
1170 | } |
1171 | ||
0c12295a | 1172 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1173 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1174 | { |
862465f2 | 1175 | struct mfc_cache *uc, *c; |
8fb472c0 NA |
1176 | bool found; |
1177 | int ret; | |
1da177e4 | 1178 | |
a50436f2 PM |
1179 | if (mfc->mfcc_parent >= MAXVIFS) |
1180 | return -ENFILE; | |
1181 | ||
8fb472c0 NA |
1182 | /* The entries are added/deleted only under RTNL */ |
1183 | rcu_read_lock(); | |
1184 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1185 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1186 | rcu_read_unlock(); | |
1187 | if (c) { | |
1da177e4 LT |
1188 | write_lock_bh(&mrt_lock); |
1189 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1190 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1191 | if (!mrtsock) |
1192 | c->mfc_flags |= MFC_STATIC; | |
1193 | write_unlock_bh(&mrt_lock); | |
8cd3ac9f | 1194 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1195 | return 0; |
1196 | } | |
1197 | ||
360eb5da | 1198 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1199 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1200 | return -EINVAL; |
1201 | ||
d658f8a0 | 1202 | c = ipmr_cache_alloc(); |
51456b29 | 1203 | if (!c) |
1da177e4 LT |
1204 | return -ENOMEM; |
1205 | ||
c354e124 JK |
1206 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1207 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1208 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1209 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1210 | if (!mrtsock) |
1211 | c->mfc_flags |= MFC_STATIC; | |
1212 | ||
8fb472c0 NA |
1213 | ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->mnode, |
1214 | ipmr_rht_params); | |
1215 | if (ret) { | |
1216 | pr_err("ipmr: rhtable insert error %d\n", ret); | |
1217 | ipmr_cache_free(c); | |
1218 | return ret; | |
1219 | } | |
1220 | list_add_tail_rcu(&c->list, &mrt->mfc_cache_list); | |
7ef8f65d NA |
1221 | /* Check to see if we resolved a queued list. If so we |
1222 | * need to send on the frames and tidy up. | |
1da177e4 | 1223 | */ |
b0ebb739 | 1224 | found = false; |
1da177e4 | 1225 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1226 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1227 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1228 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1229 | list_del(&uc->list); |
0c12295a | 1230 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1231 | found = true; |
1da177e4 LT |
1232 | break; |
1233 | } | |
1234 | } | |
0c12295a PM |
1235 | if (list_empty(&mrt->mfc_unres_queue)) |
1236 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1237 | spin_unlock_bh(&mfc_unres_lock); |
1238 | ||
b0ebb739 | 1239 | if (found) { |
0c12295a | 1240 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1241 | ipmr_cache_free(uc); |
1da177e4 | 1242 | } |
8cd3ac9f | 1243 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1244 | return 0; |
1245 | } | |
1246 | ||
7ef8f65d | 1247 | /* Close the multicast socket, and clear the vif tables etc */ |
0e615e96 | 1248 | static void mroute_clean_tables(struct mr_table *mrt, bool all) |
1da177e4 | 1249 | { |
8fb472c0 | 1250 | struct mfc_cache *c, *tmp; |
d17fa6fa | 1251 | LIST_HEAD(list); |
8fb472c0 | 1252 | int i; |
e905a9ed | 1253 | |
a8cb16dd | 1254 | /* Shut down all active vif entries */ |
0c12295a | 1255 | for (i = 0; i < mrt->maxvif; i++) { |
0e615e96 NA |
1256 | if (!all && (mrt->vif_table[i].flags & VIFF_STATIC)) |
1257 | continue; | |
1258 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1259 | } |
d17fa6fa | 1260 | unregister_netdevice_many(&list); |
1da177e4 | 1261 | |
a8cb16dd | 1262 | /* Wipe the cache */ |
8fb472c0 NA |
1263 | list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { |
1264 | if (!all && (c->mfc_flags & MFC_STATIC)) | |
1265 | continue; | |
1266 | rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); | |
1267 | list_del_rcu(&c->list); | |
1268 | mroute_netlink_event(mrt, c, RTM_DELROUTE); | |
310ebbba | 1269 | ipmr_cache_put(c); |
1da177e4 LT |
1270 | } |
1271 | ||
0c12295a | 1272 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1273 | spin_lock_bh(&mfc_unres_lock); |
8fb472c0 | 1274 | list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { |
862465f2 | 1275 | list_del(&c->list); |
8cd3ac9f | 1276 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 1277 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1278 | } |
1279 | spin_unlock_bh(&mfc_unres_lock); | |
1280 | } | |
1281 | } | |
1282 | ||
4c968709 ED |
1283 | /* called from ip_ra_control(), before an RCU grace period, |
1284 | * we dont need to call synchronize_rcu() here | |
1285 | */ | |
1da177e4 LT |
1286 | static void mrtsock_destruct(struct sock *sk) |
1287 | { | |
4feb88e5 | 1288 | struct net *net = sock_net(sk); |
f0ad0860 | 1289 | struct mr_table *mrt; |
4feb88e5 | 1290 | |
1215e51e | 1291 | ASSERT_RTNL(); |
f0ad0860 | 1292 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1293 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1294 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
3b022865 DA |
1295 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1296 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1297 | NETCONFA_IFINDEX_ALL, |
1298 | net->ipv4.devconf_all); | |
a9b3cd7f | 1299 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
0e615e96 | 1300 | mroute_clean_tables(mrt, false); |
f0ad0860 | 1301 | } |
1da177e4 | 1302 | } |
1da177e4 LT |
1303 | } |
1304 | ||
7ef8f65d NA |
1305 | /* Socket options and virtual interface manipulation. The whole |
1306 | * virtual interface system is a complete heap, but unfortunately | |
1307 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1308 | * MOSPF/PIM router set up we can clean this up. | |
1da177e4 | 1309 | */ |
e905a9ed | 1310 | |
29e97d21 NA |
1311 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, |
1312 | unsigned int optlen) | |
1da177e4 | 1313 | { |
4feb88e5 | 1314 | struct net *net = sock_net(sk); |
29e97d21 | 1315 | int val, ret = 0, parent = 0; |
f0ad0860 | 1316 | struct mr_table *mrt; |
29e97d21 NA |
1317 | struct vifctl vif; |
1318 | struct mfcctl mfc; | |
1319 | u32 uval; | |
f0ad0860 | 1320 | |
29e97d21 NA |
1321 | /* There's one exception to the lock - MRT_DONE which needs to unlock */ |
1322 | rtnl_lock(); | |
5e1859fb | 1323 | if (sk->sk_type != SOCK_RAW || |
29e97d21 NA |
1324 | inet_sk(sk)->inet_num != IPPROTO_IGMP) { |
1325 | ret = -EOPNOTSUPP; | |
1326 | goto out_unlock; | |
1327 | } | |
5e1859fb | 1328 | |
f0ad0860 | 1329 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
29e97d21 NA |
1330 | if (!mrt) { |
1331 | ret = -ENOENT; | |
1332 | goto out_unlock; | |
1333 | } | |
132adf54 | 1334 | if (optname != MRT_INIT) { |
33d480ce | 1335 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
29e97d21 NA |
1336 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
1337 | ret = -EACCES; | |
1338 | goto out_unlock; | |
1339 | } | |
1da177e4 LT |
1340 | } |
1341 | ||
132adf54 SH |
1342 | switch (optname) { |
1343 | case MRT_INIT: | |
42e6b89c | 1344 | if (optlen != sizeof(int)) { |
29e97d21 | 1345 | ret = -EINVAL; |
42e6b89c NA |
1346 | break; |
1347 | } | |
1348 | if (rtnl_dereference(mrt->mroute_sk)) { | |
29e97d21 | 1349 | ret = -EADDRINUSE; |
29e97d21 | 1350 | break; |
42e6b89c | 1351 | } |
132adf54 SH |
1352 | |
1353 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1354 | if (ret == 0) { | |
cf778b00 | 1355 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1356 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
3b022865 DA |
1357 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1358 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1359 | NETCONFA_IFINDEX_ALL, |
1360 | net->ipv4.devconf_all); | |
132adf54 | 1361 | } |
29e97d21 | 1362 | break; |
132adf54 | 1363 | case MRT_DONE: |
29e97d21 NA |
1364 | if (sk != rcu_access_pointer(mrt->mroute_sk)) { |
1365 | ret = -EACCES; | |
1366 | } else { | |
29e97d21 | 1367 | ret = ip_ra_control(sk, 0, NULL); |
1215e51e | 1368 | goto out_unlock; |
29e97d21 NA |
1369 | } |
1370 | break; | |
132adf54 SH |
1371 | case MRT_ADD_VIF: |
1372 | case MRT_DEL_VIF: | |
29e97d21 NA |
1373 | if (optlen != sizeof(vif)) { |
1374 | ret = -EINVAL; | |
1375 | break; | |
1376 | } | |
1377 | if (copy_from_user(&vif, optval, sizeof(vif))) { | |
1378 | ret = -EFAULT; | |
1379 | break; | |
1380 | } | |
1381 | if (vif.vifc_vifi >= MAXVIFS) { | |
1382 | ret = -ENFILE; | |
1383 | break; | |
1384 | } | |
c354e124 | 1385 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1386 | ret = vif_add(net, mrt, &vif, |
1387 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1388 | } else { |
0c12295a | 1389 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 | 1390 | } |
29e97d21 | 1391 | break; |
7ef8f65d NA |
1392 | /* Manipulate the forwarding caches. These live |
1393 | * in a sort of kernel/user symbiosis. | |
1394 | */ | |
132adf54 SH |
1395 | case MRT_ADD_MFC: |
1396 | case MRT_DEL_MFC: | |
660b26dc ND |
1397 | parent = -1; |
1398 | case MRT_ADD_MFC_PROXY: | |
1399 | case MRT_DEL_MFC_PROXY: | |
29e97d21 NA |
1400 | if (optlen != sizeof(mfc)) { |
1401 | ret = -EINVAL; | |
1402 | break; | |
1403 | } | |
1404 | if (copy_from_user(&mfc, optval, sizeof(mfc))) { | |
1405 | ret = -EFAULT; | |
1406 | break; | |
1407 | } | |
660b26dc ND |
1408 | if (parent == 0) |
1409 | parent = mfc.mfcc_parent; | |
660b26dc ND |
1410 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1411 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1412 | else |
4c968709 | 1413 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1414 | sk == rtnl_dereference(mrt->mroute_sk), |
1415 | parent); | |
29e97d21 | 1416 | break; |
7ef8f65d | 1417 | /* Control PIM assert. */ |
132adf54 | 1418 | case MRT_ASSERT: |
29e97d21 NA |
1419 | if (optlen != sizeof(val)) { |
1420 | ret = -EINVAL; | |
1421 | break; | |
1422 | } | |
1423 | if (get_user(val, (int __user *)optval)) { | |
1424 | ret = -EFAULT; | |
1425 | break; | |
1426 | } | |
1427 | mrt->mroute_do_assert = val; | |
1428 | break; | |
132adf54 | 1429 | case MRT_PIM: |
1973a4ea | 1430 | if (!ipmr_pimsm_enabled()) { |
29e97d21 NA |
1431 | ret = -ENOPROTOOPT; |
1432 | break; | |
1433 | } | |
1434 | if (optlen != sizeof(val)) { | |
1435 | ret = -EINVAL; | |
1436 | break; | |
1437 | } | |
1438 | if (get_user(val, (int __user *)optval)) { | |
1439 | ret = -EFAULT; | |
1440 | break; | |
1441 | } | |
ba93ef74 | 1442 | |
29e97d21 NA |
1443 | val = !!val; |
1444 | if (val != mrt->mroute_do_pim) { | |
1445 | mrt->mroute_do_pim = val; | |
1446 | mrt->mroute_do_assert = val; | |
1da177e4 | 1447 | } |
29e97d21 | 1448 | break; |
f0ad0860 | 1449 | case MRT_TABLE: |
29e97d21 NA |
1450 | if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) { |
1451 | ret = -ENOPROTOOPT; | |
1452 | break; | |
1453 | } | |
1454 | if (optlen != sizeof(uval)) { | |
1455 | ret = -EINVAL; | |
1456 | break; | |
1457 | } | |
1458 | if (get_user(uval, (u32 __user *)optval)) { | |
1459 | ret = -EFAULT; | |
1460 | break; | |
1461 | } | |
f0ad0860 | 1462 | |
4c968709 ED |
1463 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1464 | ret = -EBUSY; | |
1465 | } else { | |
29e97d21 | 1466 | mrt = ipmr_new_table(net, uval); |
1113ebbc NA |
1467 | if (IS_ERR(mrt)) |
1468 | ret = PTR_ERR(mrt); | |
5e1859fb | 1469 | else |
29e97d21 | 1470 | raw_sk(sk)->ipmr_table = uval; |
4c968709 | 1471 | } |
29e97d21 | 1472 | break; |
7ef8f65d | 1473 | /* Spurious command, or MRT_VERSION which you cannot set. */ |
132adf54 | 1474 | default: |
29e97d21 | 1475 | ret = -ENOPROTOOPT; |
1da177e4 | 1476 | } |
29e97d21 NA |
1477 | out_unlock: |
1478 | rtnl_unlock(); | |
29e97d21 | 1479 | return ret; |
1da177e4 LT |
1480 | } |
1481 | ||
7ef8f65d | 1482 | /* Getsock opt support for the multicast routing system. */ |
c354e124 | 1483 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1484 | { |
1485 | int olr; | |
1486 | int val; | |
4feb88e5 | 1487 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1488 | struct mr_table *mrt; |
1489 | ||
5e1859fb ED |
1490 | if (sk->sk_type != SOCK_RAW || |
1491 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1492 | return -EOPNOTSUPP; | |
1493 | ||
f0ad0860 | 1494 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1495 | if (!mrt) |
f0ad0860 | 1496 | return -ENOENT; |
1da177e4 | 1497 | |
fe9ef3ce NA |
1498 | switch (optname) { |
1499 | case MRT_VERSION: | |
1500 | val = 0x0305; | |
1501 | break; | |
1502 | case MRT_PIM: | |
1973a4ea | 1503 | if (!ipmr_pimsm_enabled()) |
fe9ef3ce NA |
1504 | return -ENOPROTOOPT; |
1505 | val = mrt->mroute_do_pim; | |
1506 | break; | |
1507 | case MRT_ASSERT: | |
1508 | val = mrt->mroute_do_assert; | |
1509 | break; | |
1510 | default: | |
1da177e4 | 1511 | return -ENOPROTOOPT; |
fe9ef3ce | 1512 | } |
1da177e4 LT |
1513 | |
1514 | if (get_user(olr, optlen)) | |
1515 | return -EFAULT; | |
1da177e4 LT |
1516 | olr = min_t(unsigned int, olr, sizeof(int)); |
1517 | if (olr < 0) | |
1518 | return -EINVAL; | |
c354e124 | 1519 | if (put_user(olr, optlen)) |
1da177e4 | 1520 | return -EFAULT; |
c354e124 | 1521 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1522 | return -EFAULT; |
1523 | return 0; | |
1524 | } | |
1525 | ||
7ef8f65d | 1526 | /* The IP multicast ioctl support routines. */ |
1da177e4 LT |
1527 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1528 | { | |
1529 | struct sioc_sg_req sr; | |
1530 | struct sioc_vif_req vr; | |
1531 | struct vif_device *vif; | |
1532 | struct mfc_cache *c; | |
4feb88e5 | 1533 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1534 | struct mr_table *mrt; |
1535 | ||
1536 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1537 | if (!mrt) |
f0ad0860 | 1538 | return -ENOENT; |
e905a9ed | 1539 | |
132adf54 SH |
1540 | switch (cmd) { |
1541 | case SIOCGETVIFCNT: | |
c354e124 | 1542 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1543 | return -EFAULT; |
0c12295a | 1544 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1545 | return -EINVAL; |
1546 | read_lock(&mrt_lock); | |
0c12295a PM |
1547 | vif = &mrt->vif_table[vr.vifi]; |
1548 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1549 | vr.icount = vif->pkt_in; |
1550 | vr.ocount = vif->pkt_out; | |
1551 | vr.ibytes = vif->bytes_in; | |
1552 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1553 | read_unlock(&mrt_lock); |
1da177e4 | 1554 | |
c354e124 | 1555 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1556 | return -EFAULT; |
1557 | return 0; | |
1558 | } | |
1559 | read_unlock(&mrt_lock); | |
1560 | return -EADDRNOTAVAIL; | |
1561 | case SIOCGETSGCNT: | |
c354e124 | 1562 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1563 | return -EFAULT; |
1564 | ||
a8c9486b | 1565 | rcu_read_lock(); |
0c12295a | 1566 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1567 | if (c) { |
1568 | sr.pktcnt = c->mfc_un.res.pkt; | |
1569 | sr.bytecnt = c->mfc_un.res.bytes; | |
1570 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1571 | rcu_read_unlock(); |
132adf54 | 1572 | |
c354e124 | 1573 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1574 | return -EFAULT; |
1575 | return 0; | |
1576 | } | |
a8c9486b | 1577 | rcu_read_unlock(); |
132adf54 SH |
1578 | return -EADDRNOTAVAIL; |
1579 | default: | |
1580 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1581 | } |
1582 | } | |
1583 | ||
709b46e8 EB |
1584 | #ifdef CONFIG_COMPAT |
1585 | struct compat_sioc_sg_req { | |
1586 | struct in_addr src; | |
1587 | struct in_addr grp; | |
1588 | compat_ulong_t pktcnt; | |
1589 | compat_ulong_t bytecnt; | |
1590 | compat_ulong_t wrong_if; | |
1591 | }; | |
1592 | ||
ca6b8bb0 DM |
1593 | struct compat_sioc_vif_req { |
1594 | vifi_t vifi; /* Which iface */ | |
1595 | compat_ulong_t icount; | |
1596 | compat_ulong_t ocount; | |
1597 | compat_ulong_t ibytes; | |
1598 | compat_ulong_t obytes; | |
1599 | }; | |
1600 | ||
709b46e8 EB |
1601 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1602 | { | |
0033d5ad | 1603 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1604 | struct compat_sioc_vif_req vr; |
1605 | struct vif_device *vif; | |
709b46e8 EB |
1606 | struct mfc_cache *c; |
1607 | struct net *net = sock_net(sk); | |
1608 | struct mr_table *mrt; | |
1609 | ||
1610 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1611 | if (!mrt) |
709b46e8 EB |
1612 | return -ENOENT; |
1613 | ||
1614 | switch (cmd) { | |
ca6b8bb0 DM |
1615 | case SIOCGETVIFCNT: |
1616 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1617 | return -EFAULT; | |
1618 | if (vr.vifi >= mrt->maxvif) | |
1619 | return -EINVAL; | |
1620 | read_lock(&mrt_lock); | |
1621 | vif = &mrt->vif_table[vr.vifi]; | |
1622 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1623 | vr.icount = vif->pkt_in; | |
1624 | vr.ocount = vif->pkt_out; | |
1625 | vr.ibytes = vif->bytes_in; | |
1626 | vr.obytes = vif->bytes_out; | |
1627 | read_unlock(&mrt_lock); | |
1628 | ||
1629 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1630 | return -EFAULT; | |
1631 | return 0; | |
1632 | } | |
1633 | read_unlock(&mrt_lock); | |
1634 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1635 | case SIOCGETSGCNT: |
1636 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1637 | return -EFAULT; | |
1638 | ||
1639 | rcu_read_lock(); | |
1640 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1641 | if (c) { | |
1642 | sr.pktcnt = c->mfc_un.res.pkt; | |
1643 | sr.bytecnt = c->mfc_un.res.bytes; | |
1644 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1645 | rcu_read_unlock(); | |
1646 | ||
1647 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1648 | return -EFAULT; | |
1649 | return 0; | |
1650 | } | |
1651 | rcu_read_unlock(); | |
1652 | return -EADDRNOTAVAIL; | |
1653 | default: | |
1654 | return -ENOIOCTLCMD; | |
1655 | } | |
1656 | } | |
1657 | #endif | |
1658 | ||
1da177e4 LT |
1659 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
1660 | { | |
351638e7 | 1661 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1662 | struct net *net = dev_net(dev); |
f0ad0860 | 1663 | struct mr_table *mrt; |
1da177e4 LT |
1664 | struct vif_device *v; |
1665 | int ct; | |
e9dc8653 | 1666 | |
1da177e4 LT |
1667 | if (event != NETDEV_UNREGISTER) |
1668 | return NOTIFY_DONE; | |
f0ad0860 PM |
1669 | |
1670 | ipmr_for_each_table(mrt, net) { | |
1671 | v = &mrt->vif_table[0]; | |
1672 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1673 | if (v->dev == dev) | |
e92036a6 | 1674 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1675 | } |
1da177e4 LT |
1676 | } |
1677 | return NOTIFY_DONE; | |
1678 | } | |
1679 | ||
c354e124 | 1680 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1681 | .notifier_call = ipmr_device_event, |
1682 | }; | |
1683 | ||
7ef8f65d NA |
1684 | /* Encapsulate a packet by attaching a valid IPIP header to it. |
1685 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1686 | * important for multicast video. | |
1da177e4 | 1687 | */ |
b6a7719a HFS |
1688 | static void ip_encap(struct net *net, struct sk_buff *skb, |
1689 | __be32 saddr, __be32 daddr) | |
1da177e4 | 1690 | { |
8856dfa3 | 1691 | struct iphdr *iph; |
b71d1d42 | 1692 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1693 | |
1694 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1695 | skb->transport_header = skb->network_header; |
8856dfa3 | 1696 | skb_reset_network_header(skb); |
eddc9ec5 | 1697 | iph = ip_hdr(skb); |
1da177e4 | 1698 | |
a8cb16dd | 1699 | iph->version = 4; |
e023dd64 ACM |
1700 | iph->tos = old_iph->tos; |
1701 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1702 | iph->frag_off = 0; |
1703 | iph->daddr = daddr; | |
1704 | iph->saddr = saddr; | |
1705 | iph->protocol = IPPROTO_IPIP; | |
1706 | iph->ihl = 5; | |
1707 | iph->tot_len = htons(skb->len); | |
b6a7719a | 1708 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1709 | ip_send_check(iph); |
1710 | ||
1da177e4 LT |
1711 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1712 | nf_reset(skb); | |
1713 | } | |
1714 | ||
0c4b51f0 EB |
1715 | static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
1716 | struct sk_buff *skb) | |
1da177e4 | 1717 | { |
a8cb16dd | 1718 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1719 | |
73186df8 DM |
1720 | IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
1721 | IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); | |
1da177e4 LT |
1722 | |
1723 | if (unlikely(opt->optlen)) | |
1724 | ip_forward_options(skb); | |
1725 | ||
13206b6b | 1726 | return dst_output(net, sk, skb); |
1da177e4 LT |
1727 | } |
1728 | ||
7ef8f65d | 1729 | /* Processing handlers for ipmr_forward */ |
1da177e4 | 1730 | |
0c12295a PM |
1731 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1732 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1733 | { |
eddc9ec5 | 1734 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1735 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1736 | struct net_device *dev; |
1737 | struct rtable *rt; | |
31e4543d | 1738 | struct flowi4 fl4; |
1da177e4 LT |
1739 | int encap = 0; |
1740 | ||
51456b29 | 1741 | if (!vif->dev) |
1da177e4 LT |
1742 | goto out_free; |
1743 | ||
1da177e4 LT |
1744 | if (vif->flags & VIFF_REGISTER) { |
1745 | vif->pkt_out++; | |
c354e124 | 1746 | vif->bytes_out += skb->len; |
cf3677ae PE |
1747 | vif->dev->stats.tx_bytes += skb->len; |
1748 | vif->dev->stats.tx_packets++; | |
0c12295a | 1749 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1750 | goto out_free; |
1da177e4 | 1751 | } |
1da177e4 | 1752 | |
a8cb16dd | 1753 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1754 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1755 | vif->remote, vif->local, |
1756 | 0, 0, | |
1757 | IPPROTO_IPIP, | |
1758 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1759 | if (IS_ERR(rt)) |
1da177e4 LT |
1760 | goto out_free; |
1761 | encap = sizeof(struct iphdr); | |
1762 | } else { | |
31e4543d | 1763 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1764 | 0, 0, |
1765 | IPPROTO_IPIP, | |
1766 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1767 | if (IS_ERR(rt)) |
1da177e4 LT |
1768 | goto out_free; |
1769 | } | |
1770 | ||
d8d1f30b | 1771 | dev = rt->dst.dev; |
1da177e4 | 1772 | |
d8d1f30b | 1773 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1774 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1775 | * allow to send ICMP, so that packets will disappear |
1776 | * to blackhole. | |
1da177e4 | 1777 | */ |
73186df8 | 1778 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1779 | ip_rt_put(rt); |
1780 | goto out_free; | |
1781 | } | |
1782 | ||
d8d1f30b | 1783 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1784 | |
1785 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1786 | ip_rt_put(rt); |
1da177e4 LT |
1787 | goto out_free; |
1788 | } | |
1789 | ||
1790 | vif->pkt_out++; | |
c354e124 | 1791 | vif->bytes_out += skb->len; |
1da177e4 | 1792 | |
adf30907 | 1793 | skb_dst_drop(skb); |
d8d1f30b | 1794 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1795 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1796 | |
1797 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1798 | * What do we do with netfilter? -- RR |
1799 | */ | |
1da177e4 | 1800 | if (vif->flags & VIFF_TUNNEL) { |
b6a7719a | 1801 | ip_encap(net, skb, vif->local, vif->remote); |
1da177e4 | 1802 | /* FIXME: extra output firewall step used to be here. --RR */ |
2f4c02d4 PE |
1803 | vif->dev->stats.tx_packets++; |
1804 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1805 | } |
1806 | ||
9ee6c5dc | 1807 | IPCB(skb)->flags |= IPSKB_FORWARDED; |
1da177e4 | 1808 | |
7ef8f65d | 1809 | /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
1da177e4 LT |
1810 | * not only before forwarding, but after forwarding on all output |
1811 | * interfaces. It is clear, if mrouter runs a multicasting | |
1812 | * program, it should receive packets not depending to what interface | |
1813 | * program is joined. | |
1814 | * If we will not make it, the program will have to join on all | |
1815 | * interfaces. On the other hand, multihoming host (or router, but | |
1816 | * not mrouter) cannot join to more than one interface - it will | |
1817 | * result in receiving multiple packets. | |
1818 | */ | |
29a26a56 EB |
1819 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, |
1820 | net, NULL, skb, skb->dev, dev, | |
1da177e4 LT |
1821 | ipmr_forward_finish); |
1822 | return; | |
1823 | ||
1824 | out_free: | |
1825 | kfree_skb(skb); | |
1da177e4 LT |
1826 | } |
1827 | ||
0c12295a | 1828 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1829 | { |
1830 | int ct; | |
0c12295a PM |
1831 | |
1832 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1833 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1834 | break; |
1835 | } | |
1836 | return ct; | |
1837 | } | |
1838 | ||
1839 | /* "local" means that we should preserve one skb (for local delivery) */ | |
c4854ec8 | 1840 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 DS |
1841 | struct net_device *dev, struct sk_buff *skb, |
1842 | struct mfc_cache *cache, int local) | |
1da177e4 | 1843 | { |
4b1f0d33 | 1844 | int true_vifi = ipmr_find_vif(mrt, dev); |
1da177e4 LT |
1845 | int psend = -1; |
1846 | int vif, ct; | |
1847 | ||
1848 | vif = cache->mfc_parent; | |
1849 | cache->mfc_un.res.pkt++; | |
1850 | cache->mfc_un.res.bytes += skb->len; | |
43b9e127 | 1851 | cache->mfc_un.res.lastuse = jiffies; |
1da177e4 | 1852 | |
360eb5da | 1853 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1854 | struct mfc_cache *cache_proxy; |
1855 | ||
1856 | /* For an (*,G) entry, we only check that the incomming | |
1857 | * interface is part of the static tree. | |
1858 | */ | |
1859 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); | |
1860 | if (cache_proxy && | |
1861 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) | |
1862 | goto forward; | |
1863 | } | |
1864 | ||
7ef8f65d | 1865 | /* Wrong interface: drop packet and (maybe) send PIM assert. */ |
4b1f0d33 | 1866 | if (mrt->vif_table[vif].dev != dev) { |
c7537967 | 1867 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1868 | /* It is our own packet, looped back. |
a8cb16dd ED |
1869 | * Very complicated situation... |
1870 | * | |
1871 | * The best workaround until routing daemons will be | |
1872 | * fixed is not to redistribute packet, if it was | |
1873 | * send through wrong interface. It means, that | |
1874 | * multicast applications WILL NOT work for | |
1875 | * (S,G), which have default multicast route pointing | |
1876 | * to wrong oif. In any case, it is not a good | |
1877 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1878 | */ |
1879 | goto dont_forward; | |
1880 | } | |
1881 | ||
1882 | cache->mfc_un.res.wrong_if++; | |
1da177e4 | 1883 | |
0c12295a | 1884 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1885 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1886 | * so that we cannot check that packet arrived on an oif. |
1887 | * It is bad, but otherwise we would need to move pretty | |
1888 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1889 | */ |
0c12295a | 1890 | (mrt->mroute_do_pim || |
6f9374a9 | 1891 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1892 | time_after(jiffies, |
1da177e4 LT |
1893 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1894 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1895 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1896 | } |
1897 | goto dont_forward; | |
1898 | } | |
1899 | ||
660b26dc | 1900 | forward: |
0c12295a PM |
1901 | mrt->vif_table[vif].pkt_in++; |
1902 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 | 1903 | |
7ef8f65d | 1904 | /* Forward the frame */ |
360eb5da ND |
1905 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
1906 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc ND |
1907 | if (true_vifi >= 0 && |
1908 | true_vifi != cache->mfc_parent && | |
1909 | ip_hdr(skb)->ttl > | |
1910 | cache->mfc_un.res.ttls[cache->mfc_parent]) { | |
1911 | /* It's an (*,*) entry and the packet is not coming from | |
1912 | * the upstream: forward the packet to the upstream | |
1913 | * only. | |
1914 | */ | |
1915 | psend = cache->mfc_parent; | |
1916 | goto last_forward; | |
1917 | } | |
1918 | goto dont_forward; | |
1919 | } | |
a8cb16dd ED |
1920 | for (ct = cache->mfc_un.res.maxvif - 1; |
1921 | ct >= cache->mfc_un.res.minvif; ct--) { | |
660b26dc | 1922 | /* For (*,G) entry, don't forward to the incoming interface */ |
360eb5da ND |
1923 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
1924 | ct != true_vifi) && | |
660b26dc | 1925 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1926 | if (psend != -1) { |
1927 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1928 | |
1da177e4 | 1929 | if (skb2) |
0c12295a PM |
1930 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1931 | psend); | |
1da177e4 | 1932 | } |
c354e124 | 1933 | psend = ct; |
1da177e4 LT |
1934 | } |
1935 | } | |
660b26dc | 1936 | last_forward: |
1da177e4 LT |
1937 | if (psend != -1) { |
1938 | if (local) { | |
1939 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1940 | |
1da177e4 | 1941 | if (skb2) |
0c12295a | 1942 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1943 | } else { |
0c12295a | 1944 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
c4854ec8 | 1945 | return; |
1da177e4 LT |
1946 | } |
1947 | } | |
1948 | ||
1949 | dont_forward: | |
1950 | if (!local) | |
1951 | kfree_skb(skb); | |
1da177e4 LT |
1952 | } |
1953 | ||
417da66f | 1954 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 1955 | { |
417da66f DM |
1956 | struct rtable *rt = skb_rtable(skb); |
1957 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 1958 | struct flowi4 fl4 = { |
417da66f DM |
1959 | .daddr = iph->daddr, |
1960 | .saddr = iph->saddr, | |
b0fe4a31 | 1961 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
1962 | .flowi4_oif = (rt_is_output_route(rt) ? |
1963 | skb->dev->ifindex : 0), | |
1964 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 1965 | LOOPBACK_IFINDEX : |
4fd551d7 | 1966 | skb->dev->ifindex), |
b4869889 | 1967 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
1968 | }; |
1969 | struct mr_table *mrt; | |
1970 | int err; | |
1971 | ||
da91981b | 1972 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
1973 | if (err) |
1974 | return ERR_PTR(err); | |
1975 | return mrt; | |
1976 | } | |
1da177e4 | 1977 | |
7ef8f65d NA |
1978 | /* Multicast packets for forwarding arrive here |
1979 | * Called with rcu_read_lock(); | |
1da177e4 | 1980 | */ |
1da177e4 LT |
1981 | int ip_mr_input(struct sk_buff *skb) |
1982 | { | |
1983 | struct mfc_cache *cache; | |
4feb88e5 | 1984 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1985 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 1986 | struct mr_table *mrt; |
bcfc7d33 TW |
1987 | struct net_device *dev; |
1988 | ||
1989 | /* skb->dev passed in is the loX master dev for vrfs. | |
1990 | * As there are no vifs associated with loopback devices, | |
1991 | * get the proper interface that does have a vif associated with it. | |
1992 | */ | |
1993 | dev = skb->dev; | |
1994 | if (netif_is_l3_master(skb->dev)) { | |
1995 | dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); | |
1996 | if (!dev) { | |
1997 | kfree_skb(skb); | |
1998 | return -ENODEV; | |
1999 | } | |
2000 | } | |
1da177e4 LT |
2001 | |
2002 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 2003 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 2004 | */ |
4c968709 | 2005 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
2006 | goto dont_forward; |
2007 | ||
417da66f | 2008 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2009 | if (IS_ERR(mrt)) { |
2010 | kfree_skb(skb); | |
2011 | return PTR_ERR(mrt); | |
e40dbc51 | 2012 | } |
1da177e4 | 2013 | if (!local) { |
4c968709 ED |
2014 | if (IPCB(skb)->opt.router_alert) { |
2015 | if (ip_call_ra_chain(skb)) | |
2016 | return 0; | |
2017 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
2018 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
2019 | * Cisco IOS <= 11.2(8)) do not put router alert | |
2020 | * option to IGMP packets destined to routable | |
2021 | * groups. It is very bad, because it means | |
2022 | * that we can forward NO IGMP messages. | |
2023 | */ | |
2024 | struct sock *mroute_sk; | |
2025 | ||
2026 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
2027 | if (mroute_sk) { | |
2028 | nf_reset(skb); | |
2029 | raw_rcv(mroute_sk, skb); | |
2030 | return 0; | |
2031 | } | |
1da177e4 LT |
2032 | } |
2033 | } | |
2034 | ||
a8c9486b | 2035 | /* already under rcu_read_lock() */ |
0c12295a | 2036 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
51456b29 | 2037 | if (!cache) { |
bcfc7d33 | 2038 | int vif = ipmr_find_vif(mrt, dev); |
660b26dc ND |
2039 | |
2040 | if (vif >= 0) | |
2041 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
2042 | vif); | |
2043 | } | |
1da177e4 | 2044 | |
7ef8f65d | 2045 | /* No usable cache entry */ |
51456b29 | 2046 | if (!cache) { |
1da177e4 LT |
2047 | int vif; |
2048 | ||
2049 | if (local) { | |
2050 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2051 | ip_local_deliver(skb); | |
51456b29 | 2052 | if (!skb2) |
1da177e4 | 2053 | return -ENOBUFS; |
1da177e4 LT |
2054 | skb = skb2; |
2055 | } | |
2056 | ||
a8c9486b | 2057 | read_lock(&mrt_lock); |
bcfc7d33 | 2058 | vif = ipmr_find_vif(mrt, dev); |
1da177e4 | 2059 | if (vif >= 0) { |
4b1f0d33 | 2060 | int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev); |
1da177e4 LT |
2061 | read_unlock(&mrt_lock); |
2062 | ||
0eae88f3 | 2063 | return err2; |
1da177e4 LT |
2064 | } |
2065 | read_unlock(&mrt_lock); | |
2066 | kfree_skb(skb); | |
2067 | return -ENODEV; | |
2068 | } | |
2069 | ||
a8c9486b | 2070 | read_lock(&mrt_lock); |
4b1f0d33 | 2071 | ip_mr_forward(net, mrt, dev, skb, cache, local); |
1da177e4 LT |
2072 | read_unlock(&mrt_lock); |
2073 | ||
2074 | if (local) | |
2075 | return ip_local_deliver(skb); | |
2076 | ||
2077 | return 0; | |
2078 | ||
2079 | dont_forward: | |
2080 | if (local) | |
2081 | return ip_local_deliver(skb); | |
2082 | kfree_skb(skb); | |
2083 | return 0; | |
2084 | } | |
2085 | ||
b1879204 | 2086 | #ifdef CONFIG_IP_PIMSM_V1 |
7ef8f65d | 2087 | /* Handle IGMP messages of PIMv1 */ |
a8cb16dd | 2088 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2089 | { |
2090 | struct igmphdr *pim; | |
4feb88e5 | 2091 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2092 | struct mr_table *mrt; |
b1879204 IJ |
2093 | |
2094 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2095 | goto drop; | |
2096 | ||
2097 | pim = igmp_hdr(skb); | |
2098 | ||
417da66f | 2099 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2100 | if (IS_ERR(mrt)) |
2101 | goto drop; | |
0c12295a | 2102 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2103 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2104 | goto drop; | |
2105 | ||
f0ad0860 | 2106 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2107 | drop: |
2108 | kfree_skb(skb); | |
2109 | } | |
1da177e4 LT |
2110 | return 0; |
2111 | } | |
2112 | #endif | |
2113 | ||
2114 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2115 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2116 | { |
2117 | struct pimreghdr *pim; | |
f0ad0860 PM |
2118 | struct net *net = dev_net(skb->dev); |
2119 | struct mr_table *mrt; | |
1da177e4 | 2120 | |
b1879204 | 2121 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2122 | goto drop; |
2123 | ||
9c70220b | 2124 | pim = (struct pimreghdr *)skb_transport_header(skb); |
56245cae | 2125 | if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) || |
a8cb16dd | 2126 | (pim->flags & PIM_NULL_REGISTER) || |
e905a9ed | 2127 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2128 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2129 | goto drop; |
2130 | ||
417da66f | 2131 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2132 | if (IS_ERR(mrt)) |
2133 | goto drop; | |
f0ad0860 | 2134 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2135 | drop: |
2136 | kfree_skb(skb); | |
2137 | } | |
1da177e4 LT |
2138 | return 0; |
2139 | } | |
2140 | #endif | |
2141 | ||
cb6a4e46 PM |
2142 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2143 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 | 2144 | { |
adfa85e4 | 2145 | struct rta_mfc_stats mfcs; |
43b9e127 NA |
2146 | struct nlattr *mp_attr; |
2147 | struct rtnexthop *nhp; | |
b5036cd4 | 2148 | unsigned long lastuse; |
43b9e127 | 2149 | int ct; |
1da177e4 | 2150 | |
7438189b | 2151 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1708ebc9 NA |
2152 | if (c->mfc_parent >= MAXVIFS) { |
2153 | rtm->rtm_flags |= RTNH_F_UNRESOLVED; | |
7438189b | 2154 | return -ENOENT; |
1708ebc9 | 2155 | } |
7438189b | 2156 | |
92a395e5 TG |
2157 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
2158 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) | |
2159 | return -EMSGSIZE; | |
1da177e4 | 2160 | |
92a395e5 TG |
2161 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
2162 | return -EMSGSIZE; | |
1da177e4 LT |
2163 | |
2164 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 2165 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
92a395e5 TG |
2166 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
2167 | nla_nest_cancel(skb, mp_attr); | |
2168 | return -EMSGSIZE; | |
2169 | } | |
2170 | ||
1da177e4 LT |
2171 | nhp->rtnh_flags = 0; |
2172 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 2173 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
2174 | nhp->rtnh_len = sizeof(*nhp); |
2175 | } | |
2176 | } | |
92a395e5 TG |
2177 | |
2178 | nla_nest_end(skb, mp_attr); | |
2179 | ||
b5036cd4 NA |
2180 | lastuse = READ_ONCE(c->mfc_un.res.lastuse); |
2181 | lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0; | |
2182 | ||
adfa85e4 ND |
2183 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2184 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2185 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
43b9e127 | 2186 | if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) || |
b5036cd4 | 2187 | nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse), |
43b9e127 | 2188 | RTA_PAD)) |
adfa85e4 ND |
2189 | return -EMSGSIZE; |
2190 | ||
1da177e4 LT |
2191 | rtm->rtm_type = RTN_MULTICAST; |
2192 | return 1; | |
1da177e4 LT |
2193 | } |
2194 | ||
9a1b9496 DM |
2195 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2196 | __be32 saddr, __be32 daddr, | |
9f09eaea | 2197 | struct rtmsg *rtm, u32 portid) |
1da177e4 | 2198 | { |
1da177e4 | 2199 | struct mfc_cache *cache; |
9a1b9496 DM |
2200 | struct mr_table *mrt; |
2201 | int err; | |
1da177e4 | 2202 | |
f0ad0860 | 2203 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2204 | if (!mrt) |
f0ad0860 PM |
2205 | return -ENOENT; |
2206 | ||
a8c9486b | 2207 | rcu_read_lock(); |
9a1b9496 | 2208 | cache = ipmr_cache_find(mrt, saddr, daddr); |
51456b29 | 2209 | if (!cache && skb->dev) { |
660b26dc | 2210 | int vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2211 | |
660b26dc ND |
2212 | if (vif >= 0) |
2213 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2214 | } | |
51456b29 | 2215 | if (!cache) { |
72287490 | 2216 | struct sk_buff *skb2; |
eddc9ec5 | 2217 | struct iphdr *iph; |
1da177e4 | 2218 | struct net_device *dev; |
a8cb16dd | 2219 | int vif = -1; |
1da177e4 | 2220 | |
1da177e4 | 2221 | dev = skb->dev; |
a8c9486b | 2222 | read_lock(&mrt_lock); |
a8cb16dd ED |
2223 | if (dev) |
2224 | vif = ipmr_find_vif(mrt, dev); | |
2225 | if (vif < 0) { | |
1da177e4 | 2226 | read_unlock(&mrt_lock); |
a8c9486b | 2227 | rcu_read_unlock(); |
1da177e4 LT |
2228 | return -ENODEV; |
2229 | } | |
72287490 AK |
2230 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2231 | if (!skb2) { | |
2232 | read_unlock(&mrt_lock); | |
a8c9486b | 2233 | rcu_read_unlock(); |
72287490 AK |
2234 | return -ENOMEM; |
2235 | } | |
2236 | ||
2cf75070 | 2237 | NETLINK_CB(skb2).portid = portid; |
e2d1bca7 ACM |
2238 | skb_push(skb2, sizeof(struct iphdr)); |
2239 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2240 | iph = ip_hdr(skb2); |
2241 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2242 | iph->saddr = saddr; |
2243 | iph->daddr = daddr; | |
eddc9ec5 | 2244 | iph->version = 0; |
4b1f0d33 | 2245 | err = ipmr_cache_unresolved(mrt, vif, skb2, dev); |
1da177e4 | 2246 | read_unlock(&mrt_lock); |
a8c9486b | 2247 | rcu_read_unlock(); |
1da177e4 LT |
2248 | return err; |
2249 | } | |
2250 | ||
a8c9486b | 2251 | read_lock(&mrt_lock); |
cb6a4e46 | 2252 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2253 | read_unlock(&mrt_lock); |
a8c9486b | 2254 | rcu_read_unlock(); |
1da177e4 LT |
2255 | return err; |
2256 | } | |
2257 | ||
cb6a4e46 | 2258 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2259 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2260 | int flags) | |
cb6a4e46 PM |
2261 | { |
2262 | struct nlmsghdr *nlh; | |
2263 | struct rtmsg *rtm; | |
1eb99af5 | 2264 | int err; |
cb6a4e46 | 2265 | |
65886f43 | 2266 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
51456b29 | 2267 | if (!nlh) |
cb6a4e46 PM |
2268 | return -EMSGSIZE; |
2269 | ||
2270 | rtm = nlmsg_data(nlh); | |
2271 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2272 | rtm->rtm_dst_len = 32; | |
2273 | rtm->rtm_src_len = 32; | |
2274 | rtm->rtm_tos = 0; | |
2275 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2276 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2277 | goto nla_put_failure; | |
cb6a4e46 PM |
2278 | rtm->rtm_type = RTN_MULTICAST; |
2279 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
9a68ac72 ND |
2280 | if (c->mfc_flags & MFC_STATIC) |
2281 | rtm->rtm_protocol = RTPROT_STATIC; | |
2282 | else | |
2283 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2284 | rtm->rtm_flags = 0; |
2285 | ||
930345ea JB |
2286 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
2287 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) | |
f3756b79 | 2288 | goto nla_put_failure; |
1eb99af5 ND |
2289 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
2290 | /* do not break the dump if cache is unresolved */ | |
2291 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2292 | goto nla_put_failure; |
2293 | ||
053c095a JB |
2294 | nlmsg_end(skb, nlh); |
2295 | return 0; | |
cb6a4e46 PM |
2296 | |
2297 | nla_put_failure: | |
2298 | nlmsg_cancel(skb, nlh); | |
2299 | return -EMSGSIZE; | |
2300 | } | |
2301 | ||
8cd3ac9f ND |
2302 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2303 | { | |
2304 | size_t len = | |
2305 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2306 | + nla_total_size(4) /* RTA_TABLE */ | |
2307 | + nla_total_size(4) /* RTA_SRC */ | |
2308 | + nla_total_size(4) /* RTA_DST */ | |
2309 | ; | |
2310 | ||
2311 | if (!unresolved) | |
2312 | len = len | |
2313 | + nla_total_size(4) /* RTA_IIF */ | |
2314 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2315 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2316 | /* RTA_MFC_STATS */ | |
a9a08042 | 2317 | + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) |
8cd3ac9f ND |
2318 | ; |
2319 | ||
2320 | return len; | |
2321 | } | |
2322 | ||
2323 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2324 | int cmd) | |
2325 | { | |
2326 | struct net *net = read_pnet(&mrt->net); | |
2327 | struct sk_buff *skb; | |
2328 | int err = -ENOBUFS; | |
2329 | ||
2330 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), | |
2331 | GFP_ATOMIC); | |
51456b29 | 2332 | if (!skb) |
8cd3ac9f ND |
2333 | goto errout; |
2334 | ||
65886f43 | 2335 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2336 | if (err < 0) |
2337 | goto errout; | |
2338 | ||
2339 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2340 | return; | |
2341 | ||
2342 | errout: | |
2343 | kfree_skb(skb); | |
2344 | if (err < 0) | |
2345 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2346 | } | |
2347 | ||
5a645dd8 JG |
2348 | static size_t igmpmsg_netlink_msgsize(size_t payloadlen) |
2349 | { | |
2350 | size_t len = | |
2351 | NLMSG_ALIGN(sizeof(struct rtgenmsg)) | |
2352 | + nla_total_size(1) /* IPMRA_CREPORT_MSGTYPE */ | |
2353 | + nla_total_size(4) /* IPMRA_CREPORT_VIF_ID */ | |
2354 | + nla_total_size(4) /* IPMRA_CREPORT_SRC_ADDR */ | |
2355 | + nla_total_size(4) /* IPMRA_CREPORT_DST_ADDR */ | |
2356 | /* IPMRA_CREPORT_PKT */ | |
2357 | + nla_total_size(payloadlen) | |
2358 | ; | |
2359 | ||
2360 | return len; | |
2361 | } | |
2362 | ||
2363 | static void igmpmsg_netlink_event(struct mr_table *mrt, struct sk_buff *pkt) | |
2364 | { | |
2365 | struct net *net = read_pnet(&mrt->net); | |
2366 | struct nlmsghdr *nlh; | |
2367 | struct rtgenmsg *rtgenm; | |
2368 | struct igmpmsg *msg; | |
2369 | struct sk_buff *skb; | |
2370 | struct nlattr *nla; | |
2371 | int payloadlen; | |
2372 | ||
2373 | payloadlen = pkt->len - sizeof(struct igmpmsg); | |
2374 | msg = (struct igmpmsg *)skb_network_header(pkt); | |
2375 | ||
2376 | skb = nlmsg_new(igmpmsg_netlink_msgsize(payloadlen), GFP_ATOMIC); | |
2377 | if (!skb) | |
2378 | goto errout; | |
2379 | ||
2380 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, | |
2381 | sizeof(struct rtgenmsg), 0); | |
2382 | if (!nlh) | |
2383 | goto errout; | |
2384 | rtgenm = nlmsg_data(nlh); | |
2385 | rtgenm->rtgen_family = RTNL_FAMILY_IPMR; | |
2386 | if (nla_put_u8(skb, IPMRA_CREPORT_MSGTYPE, msg->im_msgtype) || | |
2387 | nla_put_u32(skb, IPMRA_CREPORT_VIF_ID, msg->im_vif) || | |
2388 | nla_put_in_addr(skb, IPMRA_CREPORT_SRC_ADDR, | |
2389 | msg->im_src.s_addr) || | |
2390 | nla_put_in_addr(skb, IPMRA_CREPORT_DST_ADDR, | |
2391 | msg->im_dst.s_addr)) | |
2392 | goto nla_put_failure; | |
2393 | ||
2394 | nla = nla_reserve(skb, IPMRA_CREPORT_PKT, payloadlen); | |
2395 | if (!nla || skb_copy_bits(pkt, sizeof(struct igmpmsg), | |
2396 | nla_data(nla), payloadlen)) | |
2397 | goto nla_put_failure; | |
2398 | ||
2399 | nlmsg_end(skb, nlh); | |
2400 | ||
2401 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE_R, NULL, GFP_ATOMIC); | |
2402 | return; | |
2403 | ||
2404 | nla_put_failure: | |
2405 | nlmsg_cancel(skb, nlh); | |
2406 | errout: | |
2407 | kfree_skb(skb); | |
2408 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE_R, -ENOBUFS); | |
2409 | } | |
2410 | ||
4f75ba69 DS |
2411 | static int ipmr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
2412 | struct netlink_ext_ack *extack) | |
2413 | { | |
2414 | struct net *net = sock_net(in_skb->sk); | |
2415 | struct nlattr *tb[RTA_MAX + 1]; | |
2416 | struct sk_buff *skb = NULL; | |
2417 | struct mfc_cache *cache; | |
2418 | struct mr_table *mrt; | |
2419 | struct rtmsg *rtm; | |
2420 | __be32 src, grp; | |
2421 | u32 tableid; | |
2422 | int err; | |
2423 | ||
2424 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, | |
2425 | rtm_ipv4_policy, extack); | |
2426 | if (err < 0) | |
2427 | goto errout; | |
2428 | ||
2429 | rtm = nlmsg_data(nlh); | |
2430 | ||
2431 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; | |
2432 | grp = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
2433 | tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; | |
2434 | ||
2435 | mrt = ipmr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT); | |
2e3d232e DC |
2436 | if (!mrt) { |
2437 | err = -ENOENT; | |
4f75ba69 DS |
2438 | goto errout_free; |
2439 | } | |
2440 | ||
2441 | /* entries are added/deleted only under RTNL */ | |
2442 | rcu_read_lock(); | |
2443 | cache = ipmr_cache_find(mrt, src, grp); | |
2444 | rcu_read_unlock(); | |
2445 | if (!cache) { | |
2446 | err = -ENOENT; | |
2447 | goto errout_free; | |
2448 | } | |
2449 | ||
2450 | skb = nlmsg_new(mroute_msgsize(false, mrt->maxvif), GFP_KERNEL); | |
2451 | if (!skb) { | |
2452 | err = -ENOBUFS; | |
2453 | goto errout_free; | |
2454 | } | |
2455 | ||
2456 | err = ipmr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, | |
2457 | nlh->nlmsg_seq, cache, | |
2458 | RTM_NEWROUTE, 0); | |
2459 | if (err < 0) | |
2460 | goto errout_free; | |
2461 | ||
2462 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); | |
2463 | ||
2464 | errout: | |
2465 | return err; | |
2466 | ||
2467 | errout_free: | |
2468 | kfree_skb(skb); | |
2469 | goto errout; | |
2470 | } | |
2471 | ||
cb6a4e46 PM |
2472 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2473 | { | |
2474 | struct net *net = sock_net(skb->sk); | |
2475 | struct mr_table *mrt; | |
2476 | struct mfc_cache *mfc; | |
2477 | unsigned int t = 0, s_t; | |
cb6a4e46 PM |
2478 | unsigned int e = 0, s_e; |
2479 | ||
2480 | s_t = cb->args[0]; | |
8fb472c0 | 2481 | s_e = cb->args[1]; |
cb6a4e46 | 2482 | |
a8c9486b | 2483 | rcu_read_lock(); |
cb6a4e46 PM |
2484 | ipmr_for_each_table(mrt, net) { |
2485 | if (t < s_t) | |
2486 | goto next_table; | |
8fb472c0 NA |
2487 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) { |
2488 | if (e < s_e) | |
2489 | goto next_entry; | |
2490 | if (ipmr_fill_mroute(mrt, skb, | |
2491 | NETLINK_CB(cb->skb).portid, | |
2492 | cb->nlh->nlmsg_seq, | |
2493 | mfc, RTM_NEWROUTE, | |
2494 | NLM_F_MULTI) < 0) | |
2495 | goto done; | |
cb6a4e46 | 2496 | next_entry: |
8fb472c0 | 2497 | e++; |
cb6a4e46 | 2498 | } |
8fb472c0 NA |
2499 | e = 0; |
2500 | s_e = 0; | |
2501 | ||
1eb99af5 ND |
2502 | spin_lock_bh(&mfc_unres_lock); |
2503 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { | |
2504 | if (e < s_e) | |
2505 | goto next_entry2; | |
2506 | if (ipmr_fill_mroute(mrt, skb, | |
2507 | NETLINK_CB(cb->skb).portid, | |
2508 | cb->nlh->nlmsg_seq, | |
65886f43 ND |
2509 | mfc, RTM_NEWROUTE, |
2510 | NLM_F_MULTI) < 0) { | |
1eb99af5 ND |
2511 | spin_unlock_bh(&mfc_unres_lock); |
2512 | goto done; | |
2513 | } | |
2514 | next_entry2: | |
2515 | e++; | |
2516 | } | |
2517 | spin_unlock_bh(&mfc_unres_lock); | |
8fb472c0 NA |
2518 | e = 0; |
2519 | s_e = 0; | |
cb6a4e46 PM |
2520 | next_table: |
2521 | t++; | |
2522 | } | |
2523 | done: | |
a8c9486b | 2524 | rcu_read_unlock(); |
cb6a4e46 | 2525 | |
8fb472c0 | 2526 | cb->args[1] = e; |
cb6a4e46 PM |
2527 | cb->args[0] = t; |
2528 | ||
2529 | return skb->len; | |
2530 | } | |
2531 | ||
ccbb0aa6 NA |
2532 | static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = { |
2533 | [RTA_SRC] = { .type = NLA_U32 }, | |
2534 | [RTA_DST] = { .type = NLA_U32 }, | |
2535 | [RTA_IIF] = { .type = NLA_U32 }, | |
2536 | [RTA_TABLE] = { .type = NLA_U32 }, | |
2537 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, | |
2538 | }; | |
2539 | ||
2540 | static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol) | |
2541 | { | |
2542 | switch (rtm_protocol) { | |
2543 | case RTPROT_STATIC: | |
2544 | case RTPROT_MROUTED: | |
2545 | return true; | |
2546 | } | |
2547 | return false; | |
2548 | } | |
2549 | ||
2550 | static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc) | |
2551 | { | |
2552 | struct rtnexthop *rtnh = nla_data(nla); | |
2553 | int remaining = nla_len(nla), vifi = 0; | |
2554 | ||
2555 | while (rtnh_ok(rtnh, remaining)) { | |
2556 | mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops; | |
2557 | if (++vifi == MAXVIFS) | |
2558 | break; | |
2559 | rtnh = rtnh_next(rtnh, &remaining); | |
2560 | } | |
2561 | ||
2562 | return remaining > 0 ? -EINVAL : vifi; | |
2563 | } | |
2564 | ||
2565 | /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */ | |
2566 | static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh, | |
2567 | struct mfcctl *mfcc, int *mrtsock, | |
c21ef3e3 DA |
2568 | struct mr_table **mrtret, |
2569 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2570 | { |
2571 | struct net_device *dev = NULL; | |
2572 | u32 tblid = RT_TABLE_DEFAULT; | |
2573 | struct mr_table *mrt; | |
2574 | struct nlattr *attr; | |
2575 | struct rtmsg *rtm; | |
2576 | int ret, rem; | |
2577 | ||
fceb6435 | 2578 | ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy, |
c21ef3e3 | 2579 | extack); |
ccbb0aa6 NA |
2580 | if (ret < 0) |
2581 | goto out; | |
2582 | rtm = nlmsg_data(nlh); | |
2583 | ||
2584 | ret = -EINVAL; | |
2585 | if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 || | |
2586 | rtm->rtm_type != RTN_MULTICAST || | |
2587 | rtm->rtm_scope != RT_SCOPE_UNIVERSE || | |
2588 | !ipmr_rtm_validate_proto(rtm->rtm_protocol)) | |
2589 | goto out; | |
2590 | ||
2591 | memset(mfcc, 0, sizeof(*mfcc)); | |
2592 | mfcc->mfcc_parent = -1; | |
2593 | ret = 0; | |
2594 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) { | |
2595 | switch (nla_type(attr)) { | |
2596 | case RTA_SRC: | |
2597 | mfcc->mfcc_origin.s_addr = nla_get_be32(attr); | |
2598 | break; | |
2599 | case RTA_DST: | |
2600 | mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr); | |
2601 | break; | |
2602 | case RTA_IIF: | |
2603 | dev = __dev_get_by_index(net, nla_get_u32(attr)); | |
2604 | if (!dev) { | |
2605 | ret = -ENODEV; | |
2606 | goto out; | |
2607 | } | |
2608 | break; | |
2609 | case RTA_MULTIPATH: | |
2610 | if (ipmr_nla_get_ttls(attr, mfcc) < 0) { | |
2611 | ret = -EINVAL; | |
2612 | goto out; | |
2613 | } | |
2614 | break; | |
2615 | case RTA_PREFSRC: | |
2616 | ret = 1; | |
2617 | break; | |
2618 | case RTA_TABLE: | |
2619 | tblid = nla_get_u32(attr); | |
2620 | break; | |
2621 | } | |
2622 | } | |
2623 | mrt = ipmr_get_table(net, tblid); | |
2624 | if (!mrt) { | |
2625 | ret = -ENOENT; | |
2626 | goto out; | |
2627 | } | |
2628 | *mrtret = mrt; | |
2629 | *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0; | |
2630 | if (dev) | |
2631 | mfcc->mfcc_parent = ipmr_find_vif(mrt, dev); | |
2632 | ||
2633 | out: | |
2634 | return ret; | |
2635 | } | |
2636 | ||
2637 | /* takes care of both newroute and delroute */ | |
c21ef3e3 DA |
2638 | static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh, |
2639 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2640 | { |
2641 | struct net *net = sock_net(skb->sk); | |
2642 | int ret, mrtsock, parent; | |
2643 | struct mr_table *tbl; | |
2644 | struct mfcctl mfcc; | |
2645 | ||
2646 | mrtsock = 0; | |
2647 | tbl = NULL; | |
c21ef3e3 | 2648 | ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack); |
ccbb0aa6 NA |
2649 | if (ret < 0) |
2650 | return ret; | |
2651 | ||
2652 | parent = ret ? mfcc.mfcc_parent : -1; | |
2653 | if (nlh->nlmsg_type == RTM_NEWROUTE) | |
2654 | return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent); | |
2655 | else | |
2656 | return ipmr_mfc_delete(tbl, &mfcc, parent); | |
2657 | } | |
2658 | ||
772c344d NA |
2659 | static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb) |
2660 | { | |
2661 | u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len); | |
2662 | ||
2663 | if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) || | |
2664 | nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) || | |
2665 | nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM, | |
2666 | mrt->mroute_reg_vif_num) || | |
2667 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT, | |
2668 | mrt->mroute_do_assert) || | |
2669 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim)) | |
2670 | return false; | |
2671 | ||
2672 | return true; | |
2673 | } | |
2674 | ||
2675 | static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb) | |
2676 | { | |
2677 | struct nlattr *vif_nest; | |
2678 | struct vif_device *vif; | |
2679 | ||
2680 | /* if the VIF doesn't exist just continue */ | |
2681 | if (!VIF_EXISTS(mrt, vifid)) | |
2682 | return true; | |
2683 | ||
2684 | vif = &mrt->vif_table[vifid]; | |
2685 | vif_nest = nla_nest_start(skb, IPMRA_VIF); | |
2686 | if (!vif_nest) | |
2687 | return false; | |
2688 | if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) || | |
2689 | nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) || | |
2690 | nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) || | |
2691 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in, | |
2692 | IPMRA_VIFA_PAD) || | |
2693 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out, | |
2694 | IPMRA_VIFA_PAD) || | |
2695 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in, | |
2696 | IPMRA_VIFA_PAD) || | |
2697 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out, | |
2698 | IPMRA_VIFA_PAD) || | |
2699 | nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) || | |
2700 | nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) { | |
2701 | nla_nest_cancel(skb, vif_nest); | |
2702 | return false; | |
2703 | } | |
2704 | nla_nest_end(skb, vif_nest); | |
2705 | ||
2706 | return true; | |
2707 | } | |
2708 | ||
2709 | static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb) | |
2710 | { | |
2711 | struct net *net = sock_net(skb->sk); | |
2712 | struct nlmsghdr *nlh = NULL; | |
2713 | unsigned int t = 0, s_t; | |
2714 | unsigned int e = 0, s_e; | |
2715 | struct mr_table *mrt; | |
2716 | ||
2717 | s_t = cb->args[0]; | |
2718 | s_e = cb->args[1]; | |
2719 | ||
2720 | ipmr_for_each_table(mrt, net) { | |
2721 | struct nlattr *vifs, *af; | |
2722 | struct ifinfomsg *hdr; | |
2723 | u32 i; | |
2724 | ||
2725 | if (t < s_t) | |
2726 | goto skip_table; | |
2727 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
2728 | cb->nlh->nlmsg_seq, RTM_NEWLINK, | |
2729 | sizeof(*hdr), NLM_F_MULTI); | |
2730 | if (!nlh) | |
2731 | break; | |
2732 | ||
2733 | hdr = nlmsg_data(nlh); | |
2734 | memset(hdr, 0, sizeof(*hdr)); | |
2735 | hdr->ifi_family = RTNL_FAMILY_IPMR; | |
2736 | ||
2737 | af = nla_nest_start(skb, IFLA_AF_SPEC); | |
2738 | if (!af) { | |
2739 | nlmsg_cancel(skb, nlh); | |
2740 | goto out; | |
2741 | } | |
2742 | ||
2743 | if (!ipmr_fill_table(mrt, skb)) { | |
2744 | nlmsg_cancel(skb, nlh); | |
2745 | goto out; | |
2746 | } | |
2747 | ||
2748 | vifs = nla_nest_start(skb, IPMRA_TABLE_VIFS); | |
2749 | if (!vifs) { | |
2750 | nla_nest_end(skb, af); | |
2751 | nlmsg_end(skb, nlh); | |
2752 | goto out; | |
2753 | } | |
2754 | for (i = 0; i < mrt->maxvif; i++) { | |
2755 | if (e < s_e) | |
2756 | goto skip_entry; | |
2757 | if (!ipmr_fill_vif(mrt, i, skb)) { | |
2758 | nla_nest_end(skb, vifs); | |
2759 | nla_nest_end(skb, af); | |
2760 | nlmsg_end(skb, nlh); | |
2761 | goto out; | |
2762 | } | |
2763 | skip_entry: | |
2764 | e++; | |
2765 | } | |
2766 | s_e = 0; | |
2767 | e = 0; | |
2768 | nla_nest_end(skb, vifs); | |
2769 | nla_nest_end(skb, af); | |
2770 | nlmsg_end(skb, nlh); | |
2771 | skip_table: | |
2772 | t++; | |
2773 | } | |
2774 | ||
2775 | out: | |
2776 | cb->args[1] = e; | |
2777 | cb->args[0] = t; | |
2778 | ||
2779 | return skb->len; | |
2780 | } | |
2781 | ||
e905a9ed | 2782 | #ifdef CONFIG_PROC_FS |
7ef8f65d NA |
2783 | /* The /proc interfaces to multicast routing : |
2784 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 LT |
2785 | */ |
2786 | struct ipmr_vif_iter { | |
f6bb4514 | 2787 | struct seq_net_private p; |
f0ad0860 | 2788 | struct mr_table *mrt; |
1da177e4 LT |
2789 | int ct; |
2790 | }; | |
2791 | ||
f6bb4514 BT |
2792 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2793 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2794 | loff_t pos) |
2795 | { | |
f0ad0860 | 2796 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2797 | |
2798 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2799 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2800 | continue; |
e905a9ed | 2801 | if (pos-- == 0) |
0c12295a | 2802 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2803 | } |
2804 | return NULL; | |
2805 | } | |
2806 | ||
2807 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2808 | __acquires(mrt_lock) |
1da177e4 | 2809 | { |
f0ad0860 | 2810 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2811 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2812 | struct mr_table *mrt; |
2813 | ||
2814 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 2815 | if (!mrt) |
f0ad0860 PM |
2816 | return ERR_PTR(-ENOENT); |
2817 | ||
2818 | iter->mrt = mrt; | |
f6bb4514 | 2819 | |
1da177e4 | 2820 | read_lock(&mrt_lock); |
f6bb4514 | 2821 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2822 | : SEQ_START_TOKEN; |
2823 | } | |
2824 | ||
2825 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2826 | { | |
2827 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2828 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2829 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2830 | |
2831 | ++*pos; | |
2832 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2833 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2834 | |
0c12295a PM |
2835 | while (++iter->ct < mrt->maxvif) { |
2836 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2837 | continue; |
0c12295a | 2838 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2839 | } |
2840 | return NULL; | |
2841 | } | |
2842 | ||
2843 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2844 | __releases(mrt_lock) |
1da177e4 LT |
2845 | { |
2846 | read_unlock(&mrt_lock); | |
2847 | } | |
2848 | ||
2849 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2850 | { | |
f0ad0860 PM |
2851 | struct ipmr_vif_iter *iter = seq->private; |
2852 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2853 | |
1da177e4 | 2854 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2855 | seq_puts(seq, |
1da177e4 LT |
2856 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2857 | } else { | |
2858 | const struct vif_device *vif = v; | |
2859 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2860 | ||
2861 | seq_printf(seq, | |
5b5e0928 | 2862 | "%2zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
0c12295a | 2863 | vif - mrt->vif_table, |
e905a9ed | 2864 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2865 | vif->bytes_out, vif->pkt_out, |
2866 | vif->flags, vif->local, vif->remote); | |
2867 | } | |
2868 | return 0; | |
2869 | } | |
2870 | ||
f690808e | 2871 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2872 | .start = ipmr_vif_seq_start, |
2873 | .next = ipmr_vif_seq_next, | |
2874 | .stop = ipmr_vif_seq_stop, | |
2875 | .show = ipmr_vif_seq_show, | |
2876 | }; | |
2877 | ||
2878 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2879 | { | |
f6bb4514 BT |
2880 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2881 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2882 | } |
2883 | ||
9a32144e | 2884 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2885 | .owner = THIS_MODULE, |
2886 | .open = ipmr_vif_open, | |
2887 | .read = seq_read, | |
2888 | .llseek = seq_lseek, | |
f6bb4514 | 2889 | .release = seq_release_net, |
1da177e4 LT |
2890 | }; |
2891 | ||
2892 | struct ipmr_mfc_iter { | |
f6bb4514 | 2893 | struct seq_net_private p; |
f0ad0860 | 2894 | struct mr_table *mrt; |
862465f2 | 2895 | struct list_head *cache; |
1da177e4 LT |
2896 | }; |
2897 | ||
f6bb4514 BT |
2898 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2899 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2900 | { |
f0ad0860 | 2901 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2902 | struct mfc_cache *mfc; |
2903 | ||
a8c9486b | 2904 | rcu_read_lock(); |
8fb472c0 NA |
2905 | it->cache = &mrt->mfc_cache_list; |
2906 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) | |
2907 | if (pos-- == 0) | |
2908 | return mfc; | |
a8c9486b | 2909 | rcu_read_unlock(); |
1da177e4 | 2910 | |
1da177e4 | 2911 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2912 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2913 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2914 | if (pos-- == 0) |
1da177e4 LT |
2915 | return mfc; |
2916 | spin_unlock_bh(&mfc_unres_lock); | |
2917 | ||
2918 | it->cache = NULL; | |
2919 | return NULL; | |
2920 | } | |
2921 | ||
2922 | ||
2923 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2924 | { | |
2925 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2926 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2927 | struct mr_table *mrt; |
f6bb4514 | 2928 | |
f0ad0860 | 2929 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2930 | if (!mrt) |
f0ad0860 | 2931 | return ERR_PTR(-ENOENT); |
f6bb4514 | 2932 | |
f0ad0860 | 2933 | it->mrt = mrt; |
1da177e4 | 2934 | it->cache = NULL; |
f6bb4514 | 2935 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2936 | : SEQ_START_TOKEN; |
2937 | } | |
2938 | ||
2939 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2940 | { | |
1da177e4 | 2941 | struct ipmr_mfc_iter *it = seq->private; |
f6bb4514 | 2942 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2943 | struct mr_table *mrt = it->mrt; |
8fb472c0 | 2944 | struct mfc_cache *mfc = v; |
1da177e4 LT |
2945 | |
2946 | ++*pos; | |
2947 | ||
2948 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2949 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2950 | |
862465f2 PM |
2951 | if (mfc->list.next != it->cache) |
2952 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2953 | |
0c12295a | 2954 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2955 | goto end_of_list; |
2956 | ||
1da177e4 | 2957 | /* exhausted cache_array, show unresolved */ |
a8c9486b | 2958 | rcu_read_unlock(); |
0c12295a | 2959 | it->cache = &mrt->mfc_unres_queue; |
e905a9ed | 2960 | |
1da177e4 | 2961 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2962 | if (!list_empty(it->cache)) |
2963 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 | 2964 | |
a8cb16dd | 2965 | end_of_list: |
1da177e4 LT |
2966 | spin_unlock_bh(&mfc_unres_lock); |
2967 | it->cache = NULL; | |
2968 | ||
2969 | return NULL; | |
2970 | } | |
2971 | ||
2972 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2973 | { | |
2974 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2975 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2976 | |
0c12295a | 2977 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2978 | spin_unlock_bh(&mfc_unres_lock); |
8fb472c0 | 2979 | else if (it->cache == &mrt->mfc_cache_list) |
a8c9486b | 2980 | rcu_read_unlock(); |
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; | |
2992 | const struct ipmr_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, | |
1ea472e2 | 2998 | mfc->mfc_parent); |
1da177e4 | 2999 | |
0c12295a | 3000 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
3001 | seq_printf(seq, " %8lu %8lu %8lu", |
3002 | mfc->mfc_un.res.pkt, | |
3003 | mfc->mfc_un.res.bytes, | |
3004 | mfc->mfc_un.res.wrong_if); | |
132adf54 | 3005 | for (n = mfc->mfc_un.res.minvif; |
a8cb16dd | 3006 | n < mfc->mfc_un.res.maxvif; n++) { |
0c12295a | 3007 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
3008 | mfc->mfc_un.res.ttls[n] < 255) |
3009 | seq_printf(seq, | |
e905a9ed | 3010 | " %2d:%-3d", |
1da177e4 LT |
3011 | n, mfc->mfc_un.res.ttls[n]); |
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 LT |
3025 | .start = ipmr_mfc_seq_start, |
3026 | .next = ipmr_mfc_seq_next, | |
3027 | .stop = ipmr_mfc_seq_stop, | |
3028 | .show = ipmr_mfc_seq_show, | |
3029 | }; | |
3030 | ||
3031 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
3032 | { | |
f6bb4514 BT |
3033 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
3034 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
3035 | } |
3036 | ||
9a32144e | 3037 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
3038 | .owner = THIS_MODULE, |
3039 | .open = ipmr_mfc_open, | |
3040 | .read = seq_read, | |
3041 | .llseek = seq_lseek, | |
f6bb4514 | 3042 | .release = seq_release_net, |
1da177e4 | 3043 | }; |
e905a9ed | 3044 | #endif |
1da177e4 LT |
3045 | |
3046 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 3047 | static const struct net_protocol pim_protocol = { |
1da177e4 | 3048 | .handler = pim_rcv, |
403dbb97 | 3049 | .netns_ok = 1, |
1da177e4 LT |
3050 | }; |
3051 | #endif | |
3052 | ||
7ef8f65d | 3053 | /* Setup for IP multicast routing */ |
cf958ae3 BT |
3054 | static int __net_init ipmr_net_init(struct net *net) |
3055 | { | |
f0ad0860 | 3056 | int err; |
cf958ae3 | 3057 | |
f0ad0860 PM |
3058 | err = ipmr_rules_init(net); |
3059 | if (err < 0) | |
cf958ae3 | 3060 | goto fail; |
f6bb4514 BT |
3061 | |
3062 | #ifdef CONFIG_PROC_FS | |
3063 | err = -ENOMEM; | |
d4beaa66 | 3064 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 3065 | goto proc_vif_fail; |
d4beaa66 | 3066 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
3067 | goto proc_cache_fail; |
3068 | #endif | |
2bb8b26c BT |
3069 | return 0; |
3070 | ||
f6bb4514 BT |
3071 | #ifdef CONFIG_PROC_FS |
3072 | proc_cache_fail: | |
ece31ffd | 3073 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 3074 | proc_vif_fail: |
f0ad0860 | 3075 | ipmr_rules_exit(net); |
f6bb4514 | 3076 | #endif |
cf958ae3 BT |
3077 | fail: |
3078 | return err; | |
3079 | } | |
3080 | ||
3081 | static void __net_exit ipmr_net_exit(struct net *net) | |
3082 | { | |
f6bb4514 | 3083 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
3084 | remove_proc_entry("ip_mr_cache", net->proc_net); |
3085 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 3086 | #endif |
f0ad0860 | 3087 | ipmr_rules_exit(net); |
cf958ae3 BT |
3088 | } |
3089 | ||
3090 | static struct pernet_operations ipmr_net_ops = { | |
3091 | .init = ipmr_net_init, | |
3092 | .exit = ipmr_net_exit, | |
3093 | }; | |
e905a9ed | 3094 | |
03d2f897 | 3095 | int __init ip_mr_init(void) |
1da177e4 | 3096 | { |
03d2f897 WC |
3097 | int err; |
3098 | ||
1da177e4 LT |
3099 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
3100 | sizeof(struct mfc_cache), | |
a8c9486b | 3101 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 3102 | NULL); |
03d2f897 | 3103 | |
cf958ae3 BT |
3104 | err = register_pernet_subsys(&ipmr_net_ops); |
3105 | if (err) | |
3106 | goto reg_pernet_fail; | |
3107 | ||
03d2f897 WC |
3108 | err = register_netdevice_notifier(&ip_mr_notifier); |
3109 | if (err) | |
3110 | goto reg_notif_fail; | |
403dbb97 TG |
3111 | #ifdef CONFIG_IP_PIMSM_V2 |
3112 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 3113 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
3114 | err = -EAGAIN; |
3115 | goto add_proto_fail; | |
3116 | } | |
3117 | #endif | |
c7ac8679 | 3118 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
b97bac64 | 3119 | ipmr_rtm_getroute, ipmr_rtm_dumproute, 0); |
ccbb0aa6 | 3120 | rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, |
b97bac64 | 3121 | ipmr_rtm_route, NULL, 0); |
ccbb0aa6 | 3122 | rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, |
b97bac64 | 3123 | ipmr_rtm_route, NULL, 0); |
772c344d NA |
3124 | |
3125 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK, | |
b97bac64 | 3126 | NULL, ipmr_rtm_dumplink, 0); |
03d2f897 | 3127 | return 0; |
f6bb4514 | 3128 | |
403dbb97 TG |
3129 | #ifdef CONFIG_IP_PIMSM_V2 |
3130 | add_proto_fail: | |
3131 | unregister_netdevice_notifier(&ip_mr_notifier); | |
3132 | #endif | |
c3e38896 | 3133 | reg_notif_fail: |
cf958ae3 BT |
3134 | unregister_pernet_subsys(&ipmr_net_ops); |
3135 | reg_pernet_fail: | |
c3e38896 | 3136 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 3137 | return err; |
1da177e4 | 3138 | } |