]>
Commit | Line | Data |
---|---|---|
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); | |
0e615e96 | 112 | static void mroute_clean_tables(struct mr_table *mrt, bool all); |
f0ad0860 PM |
113 | static void ipmr_expire_process(unsigned long arg); |
114 | ||
115 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
116 | #define ipmr_for_each_table(mrt, net) \ | |
117 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
118 | ||
119 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
120 | { | |
121 | struct mr_table *mrt; | |
122 | ||
123 | ipmr_for_each_table(mrt, net) { | |
124 | if (mrt->id == id) | |
125 | return mrt; | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
da91981b | 130 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
131 | struct mr_table **mrt) |
132 | { | |
f0ad0860 | 133 | int err; |
95f4a45d HFS |
134 | struct ipmr_result res; |
135 | struct fib_lookup_arg arg = { | |
136 | .result = &res, | |
137 | .flags = FIB_LOOKUP_NOREF, | |
138 | }; | |
f0ad0860 | 139 | |
e58e4159 DA |
140 | /* update flow if oif or iif point to device enslaved to l3mdev */ |
141 | l3mdev_update_flow(net, flowi4_to_flowi(flp4)); | |
142 | ||
da91981b DM |
143 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
144 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
145 | if (err < 0) |
146 | return err; | |
147 | *mrt = res.mrt; | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
152 | int flags, struct fib_lookup_arg *arg) | |
153 | { | |
154 | struct ipmr_result *res = arg->result; | |
155 | struct mr_table *mrt; | |
1da177e4 | 156 | |
f0ad0860 PM |
157 | switch (rule->action) { |
158 | case FR_ACT_TO_TBL: | |
159 | break; | |
160 | case FR_ACT_UNREACHABLE: | |
161 | return -ENETUNREACH; | |
162 | case FR_ACT_PROHIBIT: | |
163 | return -EACCES; | |
164 | case FR_ACT_BLACKHOLE: | |
165 | default: | |
166 | return -EINVAL; | |
167 | } | |
168 | ||
e58e4159 DA |
169 | arg->table = fib_rule_get_table(rule, arg); |
170 | ||
171 | mrt = ipmr_get_table(rule->fr_net, arg->table); | |
51456b29 | 172 | if (!mrt) |
f0ad0860 PM |
173 | return -EAGAIN; |
174 | res->mrt = mrt; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
179 | { | |
180 | return 1; | |
181 | } | |
182 | ||
183 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
184 | FRA_GENERIC_POLICY, | |
185 | }; | |
186 | ||
187 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
188 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
189 | { | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
194 | struct nlattr **tb) | |
195 | { | |
196 | return 1; | |
197 | } | |
198 | ||
199 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
200 | struct fib_rule_hdr *frh) | |
201 | { | |
202 | frh->dst_len = 0; | |
203 | frh->src_len = 0; | |
204 | frh->tos = 0; | |
205 | return 0; | |
206 | } | |
207 | ||
04a6f82c | 208 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 209 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
210 | .rule_size = sizeof(struct ipmr_rule), |
211 | .addr_size = sizeof(u32), | |
212 | .action = ipmr_rule_action, | |
213 | .match = ipmr_rule_match, | |
214 | .configure = ipmr_rule_configure, | |
215 | .compare = ipmr_rule_compare, | |
f0ad0860 PM |
216 | .fill = ipmr_rule_fill, |
217 | .nlgroup = RTNLGRP_IPV4_RULE, | |
218 | .policy = ipmr_rule_policy, | |
219 | .owner = THIS_MODULE, | |
220 | }; | |
221 | ||
222 | static int __net_init ipmr_rules_init(struct net *net) | |
223 | { | |
224 | struct fib_rules_ops *ops; | |
225 | struct mr_table *mrt; | |
226 | int err; | |
227 | ||
228 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
229 | if (IS_ERR(ops)) | |
230 | return PTR_ERR(ops); | |
231 | ||
232 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
233 | ||
234 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
1113ebbc NA |
235 | if (IS_ERR(mrt)) { |
236 | err = PTR_ERR(mrt); | |
f0ad0860 PM |
237 | goto err1; |
238 | } | |
239 | ||
240 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
241 | if (err < 0) | |
242 | goto err2; | |
243 | ||
244 | net->ipv4.mr_rules_ops = ops; | |
245 | return 0; | |
246 | ||
247 | err2: | |
f243e5a7 | 248 | ipmr_free_table(mrt); |
f0ad0860 PM |
249 | err1: |
250 | fib_rules_unregister(ops); | |
251 | return err; | |
252 | } | |
253 | ||
254 | static void __net_exit ipmr_rules_exit(struct net *net) | |
255 | { | |
256 | struct mr_table *mrt, *next; | |
257 | ||
ed785309 | 258 | rtnl_lock(); |
035320d5 ED |
259 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
260 | list_del(&mrt->list); | |
acbb219d | 261 | ipmr_free_table(mrt); |
035320d5 | 262 | } |
f0ad0860 | 263 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
419df12f | 264 | rtnl_unlock(); |
f0ad0860 PM |
265 | } |
266 | #else | |
267 | #define ipmr_for_each_table(mrt, net) \ | |
268 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
269 | ||
270 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
271 | { | |
272 | return net->ipv4.mrt; | |
273 | } | |
274 | ||
da91981b | 275 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
276 | struct mr_table **mrt) |
277 | { | |
278 | *mrt = net->ipv4.mrt; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int __net_init ipmr_rules_init(struct net *net) | |
283 | { | |
1113ebbc NA |
284 | struct mr_table *mrt; |
285 | ||
286 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
287 | if (IS_ERR(mrt)) | |
288 | return PTR_ERR(mrt); | |
289 | net->ipv4.mrt = mrt; | |
290 | return 0; | |
f0ad0860 PM |
291 | } |
292 | ||
293 | static void __net_exit ipmr_rules_exit(struct net *net) | |
294 | { | |
ed785309 | 295 | rtnl_lock(); |
acbb219d | 296 | ipmr_free_table(net->ipv4.mrt); |
ed785309 WC |
297 | net->ipv4.mrt = NULL; |
298 | rtnl_unlock(); | |
f0ad0860 PM |
299 | } |
300 | #endif | |
301 | ||
8fb472c0 NA |
302 | static inline int ipmr_hash_cmp(struct rhashtable_compare_arg *arg, |
303 | const void *ptr) | |
304 | { | |
305 | const struct mfc_cache_cmp_arg *cmparg = arg->key; | |
306 | struct mfc_cache *c = (struct mfc_cache *)ptr; | |
307 | ||
308 | return cmparg->mfc_mcastgrp != c->mfc_mcastgrp || | |
309 | cmparg->mfc_origin != c->mfc_origin; | |
310 | } | |
311 | ||
312 | static const struct rhashtable_params ipmr_rht_params = { | |
313 | .head_offset = offsetof(struct mfc_cache, mnode), | |
314 | .key_offset = offsetof(struct mfc_cache, cmparg), | |
315 | .key_len = sizeof(struct mfc_cache_cmp_arg), | |
316 | .nelem_hint = 3, | |
317 | .locks_mul = 1, | |
318 | .obj_cmpfn = ipmr_hash_cmp, | |
319 | .automatic_shrinking = true, | |
320 | }; | |
321 | ||
f0ad0860 PM |
322 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) |
323 | { | |
324 | struct mr_table *mrt; | |
1da177e4 | 325 | |
1113ebbc NA |
326 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
327 | if (id != RT_TABLE_DEFAULT && id >= 1000000000) | |
328 | return ERR_PTR(-EINVAL); | |
329 | ||
f0ad0860 | 330 | mrt = ipmr_get_table(net, id); |
00db4124 | 331 | if (mrt) |
f0ad0860 PM |
332 | return mrt; |
333 | ||
334 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
51456b29 | 335 | if (!mrt) |
1113ebbc | 336 | return ERR_PTR(-ENOMEM); |
8de53dfb | 337 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
338 | mrt->id = id; |
339 | ||
8fb472c0 NA |
340 | rhltable_init(&mrt->mfc_hash, &ipmr_rht_params); |
341 | INIT_LIST_HEAD(&mrt->mfc_cache_list); | |
f0ad0860 PM |
342 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); |
343 | ||
344 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
345 | (unsigned long)mrt); | |
346 | ||
f0ad0860 | 347 | mrt->mroute_reg_vif_num = -1; |
f0ad0860 PM |
348 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES |
349 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
350 | #endif | |
351 | return mrt; | |
352 | } | |
1da177e4 | 353 | |
acbb219d FR |
354 | static void ipmr_free_table(struct mr_table *mrt) |
355 | { | |
356 | del_timer_sync(&mrt->ipmr_expire_timer); | |
0e615e96 | 357 | mroute_clean_tables(mrt, true); |
8fb472c0 | 358 | rhltable_destroy(&mrt->mfc_hash); |
acbb219d FR |
359 | kfree(mrt); |
360 | } | |
361 | ||
1da177e4 LT |
362 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
363 | ||
d607032d WC |
364 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
365 | { | |
4feb88e5 BT |
366 | struct net *net = dev_net(dev); |
367 | ||
d607032d WC |
368 | dev_close(dev); |
369 | ||
4feb88e5 | 370 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 371 | if (dev) { |
5bc3eb7e | 372 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 373 | struct ifreq ifr; |
d607032d WC |
374 | struct ip_tunnel_parm p; |
375 | ||
376 | memset(&p, 0, sizeof(p)); | |
377 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
378 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
379 | p.iph.version = 4; | |
380 | p.iph.ihl = 5; | |
381 | p.iph.protocol = IPPROTO_IPIP; | |
382 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
383 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
384 | ||
5bc3eb7e SH |
385 | if (ops->ndo_do_ioctl) { |
386 | mm_segment_t oldfs = get_fs(); | |
387 | ||
388 | set_fs(KERNEL_DS); | |
389 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
390 | set_fs(oldfs); | |
391 | } | |
d607032d WC |
392 | } |
393 | } | |
394 | ||
a0b47736 NA |
395 | /* Initialize ipmr pimreg/tunnel in_device */ |
396 | static bool ipmr_init_vif_indev(const struct net_device *dev) | |
397 | { | |
398 | struct in_device *in_dev; | |
399 | ||
400 | ASSERT_RTNL(); | |
401 | ||
402 | in_dev = __in_dev_get_rtnl(dev); | |
403 | if (!in_dev) | |
404 | return false; | |
405 | ipv4_devconf_setall(in_dev); | |
406 | neigh_parms_data_state_setall(in_dev->arp_parms); | |
407 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
408 | ||
409 | return true; | |
410 | } | |
411 | ||
7ef8f65d | 412 | static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
413 | { |
414 | struct net_device *dev; | |
415 | ||
4feb88e5 | 416 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
417 | |
418 | if (dev) { | |
5bc3eb7e | 419 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
420 | int err; |
421 | struct ifreq ifr; | |
1da177e4 | 422 | struct ip_tunnel_parm p; |
1da177e4 LT |
423 | |
424 | memset(&p, 0, sizeof(p)); | |
425 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
426 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
427 | p.iph.version = 4; | |
428 | p.iph.ihl = 5; | |
429 | p.iph.protocol = IPPROTO_IPIP; | |
430 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 431 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 432 | |
5bc3eb7e SH |
433 | if (ops->ndo_do_ioctl) { |
434 | mm_segment_t oldfs = get_fs(); | |
435 | ||
436 | set_fs(KERNEL_DS); | |
437 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
438 | set_fs(oldfs); | |
a8cb16dd | 439 | } else { |
5bc3eb7e | 440 | err = -EOPNOTSUPP; |
a8cb16dd | 441 | } |
1da177e4 LT |
442 | dev = NULL; |
443 | ||
4feb88e5 BT |
444 | if (err == 0 && |
445 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 | 446 | dev->flags |= IFF_MULTICAST; |
a0b47736 | 447 | if (!ipmr_init_vif_indev(dev)) |
1da177e4 | 448 | goto failure; |
1da177e4 LT |
449 | if (dev_open(dev)) |
450 | goto failure; | |
7dc00c82 | 451 | dev_hold(dev); |
1da177e4 LT |
452 | } |
453 | } | |
454 | return dev; | |
455 | ||
456 | failure: | |
1da177e4 LT |
457 | unregister_netdevice(dev); |
458 | return NULL; | |
459 | } | |
460 | ||
c316c629 | 461 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
6fef4c0c | 462 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 463 | { |
4feb88e5 | 464 | struct net *net = dev_net(dev); |
f0ad0860 | 465 | struct mr_table *mrt; |
da91981b DM |
466 | struct flowi4 fl4 = { |
467 | .flowi4_oif = dev->ifindex, | |
6a662719 | 468 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
da91981b | 469 | .flowi4_mark = skb->mark, |
f0ad0860 PM |
470 | }; |
471 | int err; | |
472 | ||
da91981b | 473 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
474 | if (err < 0) { |
475 | kfree_skb(skb); | |
f0ad0860 | 476 | return err; |
e40dbc51 | 477 | } |
4feb88e5 | 478 | |
1da177e4 | 479 | read_lock(&mrt_lock); |
cf3677ae PE |
480 | dev->stats.tx_bytes += skb->len; |
481 | dev->stats.tx_packets++; | |
0c12295a | 482 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
483 | read_unlock(&mrt_lock); |
484 | kfree_skb(skb); | |
6ed10654 | 485 | return NETDEV_TX_OK; |
1da177e4 LT |
486 | } |
487 | ||
ee9b9596 ND |
488 | static int reg_vif_get_iflink(const struct net_device *dev) |
489 | { | |
490 | return 0; | |
491 | } | |
492 | ||
007c3838 SH |
493 | static const struct net_device_ops reg_vif_netdev_ops = { |
494 | .ndo_start_xmit = reg_vif_xmit, | |
ee9b9596 | 495 | .ndo_get_iflink = reg_vif_get_iflink, |
007c3838 SH |
496 | }; |
497 | ||
1da177e4 LT |
498 | static void reg_vif_setup(struct net_device *dev) |
499 | { | |
500 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 501 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 502 | dev->flags = IFF_NOARP; |
70cb4a45 | 503 | dev->netdev_ops = ®_vif_netdev_ops; |
cf124db5 | 504 | dev->needs_free_netdev = true; |
403dbb97 | 505 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
506 | } |
507 | ||
f0ad0860 | 508 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
509 | { |
510 | struct net_device *dev; | |
f0ad0860 | 511 | char name[IFNAMSIZ]; |
1da177e4 | 512 | |
f0ad0860 PM |
513 | if (mrt->id == RT_TABLE_DEFAULT) |
514 | sprintf(name, "pimreg"); | |
515 | else | |
516 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 517 | |
c835a677 | 518 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
1da177e4 | 519 | |
51456b29 | 520 | if (!dev) |
1da177e4 LT |
521 | return NULL; |
522 | ||
403dbb97 TG |
523 | dev_net_set(dev, net); |
524 | ||
1da177e4 LT |
525 | if (register_netdevice(dev)) { |
526 | free_netdev(dev); | |
527 | return NULL; | |
528 | } | |
1da177e4 | 529 | |
a0b47736 | 530 | if (!ipmr_init_vif_indev(dev)) |
1da177e4 | 531 | goto failure; |
1da177e4 LT |
532 | if (dev_open(dev)) |
533 | goto failure; | |
534 | ||
7dc00c82 WC |
535 | dev_hold(dev); |
536 | ||
1da177e4 LT |
537 | return dev; |
538 | ||
539 | failure: | |
1da177e4 LT |
540 | unregister_netdevice(dev); |
541 | return NULL; | |
542 | } | |
c316c629 NA |
543 | |
544 | /* called with rcu_read_lock() */ | |
545 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, | |
546 | unsigned int pimlen) | |
547 | { | |
548 | struct net_device *reg_dev = NULL; | |
549 | struct iphdr *encap; | |
550 | ||
551 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); | |
7ef8f65d | 552 | /* Check that: |
c316c629 NA |
553 | * a. packet is really sent to a multicast group |
554 | * b. packet is not a NULL-REGISTER | |
555 | * c. packet is not truncated | |
556 | */ | |
557 | if (!ipv4_is_multicast(encap->daddr) || | |
558 | encap->tot_len == 0 || | |
559 | ntohs(encap->tot_len) + pimlen > skb->len) | |
560 | return 1; | |
561 | ||
562 | read_lock(&mrt_lock); | |
563 | if (mrt->mroute_reg_vif_num >= 0) | |
564 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
565 | read_unlock(&mrt_lock); | |
566 | ||
567 | if (!reg_dev) | |
568 | return 1; | |
569 | ||
570 | skb->mac_header = skb->network_header; | |
571 | skb_pull(skb, (u8 *)encap - skb->data); | |
572 | skb_reset_network_header(skb); | |
573 | skb->protocol = htons(ETH_P_IP); | |
574 | skb->ip_summed = CHECKSUM_NONE; | |
575 | ||
576 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); | |
577 | ||
578 | netif_rx(skb); | |
579 | ||
580 | return NET_RX_SUCCESS; | |
581 | } | |
582 | #else | |
583 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) | |
584 | { | |
585 | return NULL; | |
586 | } | |
1da177e4 LT |
587 | #endif |
588 | ||
2c53040f BH |
589 | /** |
590 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 591 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 592 | */ |
0c12295a | 593 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 594 | struct list_head *head) |
1da177e4 LT |
595 | { |
596 | struct vif_device *v; | |
597 | struct net_device *dev; | |
598 | struct in_device *in_dev; | |
599 | ||
0c12295a | 600 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
601 | return -EADDRNOTAVAIL; |
602 | ||
0c12295a | 603 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
604 | |
605 | write_lock_bh(&mrt_lock); | |
606 | dev = v->dev; | |
607 | v->dev = NULL; | |
608 | ||
609 | if (!dev) { | |
610 | write_unlock_bh(&mrt_lock); | |
611 | return -EADDRNOTAVAIL; | |
612 | } | |
613 | ||
0c12295a PM |
614 | if (vifi == mrt->mroute_reg_vif_num) |
615 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 | 616 | |
a8cb16dd | 617 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 618 | int tmp; |
a8cb16dd ED |
619 | |
620 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 621 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
622 | break; |
623 | } | |
0c12295a | 624 | mrt->maxvif = tmp+1; |
1da177e4 LT |
625 | } |
626 | ||
627 | write_unlock_bh(&mrt_lock); | |
628 | ||
629 | dev_set_allmulti(dev, -1); | |
630 | ||
a8cb16dd ED |
631 | in_dev = __in_dev_get_rtnl(dev); |
632 | if (in_dev) { | |
42f811b8 | 633 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
3b022865 | 634 | inet_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, |
d67b8c61 ND |
635 | NETCONFA_MC_FORWARDING, |
636 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
637 | ip_rt_multicast_event(in_dev); |
638 | } | |
639 | ||
a8cb16dd | 640 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 641 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
642 | |
643 | dev_put(dev); | |
644 | return 0; | |
645 | } | |
646 | ||
a8c9486b | 647 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 648 | { |
a8c9486b ED |
649 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
650 | ||
5c0a66f5 BT |
651 | kmem_cache_free(mrt_cachep, c); |
652 | } | |
653 | ||
a8c9486b ED |
654 | static inline void ipmr_cache_free(struct mfc_cache *c) |
655 | { | |
656 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
657 | } | |
658 | ||
1da177e4 | 659 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 660 | * and reporting error to netlink readers. |
1da177e4 | 661 | */ |
0c12295a | 662 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 663 | { |
8de53dfb | 664 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 665 | struct sk_buff *skb; |
9ef1d4c7 | 666 | struct nlmsgerr *e; |
1da177e4 | 667 | |
0c12295a | 668 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 669 | |
c354e124 | 670 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 671 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
672 | struct nlmsghdr *nlh = skb_pull(skb, |
673 | sizeof(struct iphdr)); | |
1da177e4 | 674 | nlh->nlmsg_type = NLMSG_ERROR; |
573ce260 | 675 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 676 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 677 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
678 | e->error = -ETIMEDOUT; |
679 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 680 | |
15e47304 | 681 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 682 | } else { |
1da177e4 | 683 | kfree_skb(skb); |
a8cb16dd | 684 | } |
1da177e4 LT |
685 | } |
686 | ||
5c0a66f5 | 687 | ipmr_cache_free(c); |
1da177e4 LT |
688 | } |
689 | ||
e258beb2 | 690 | /* Timer process for the unresolved queue. */ |
e258beb2 | 691 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 692 | { |
0c12295a | 693 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
694 | unsigned long now; |
695 | unsigned long expires; | |
862465f2 | 696 | struct mfc_cache *c, *next; |
1da177e4 LT |
697 | |
698 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 699 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
700 | return; |
701 | } | |
702 | ||
0c12295a | 703 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
704 | goto out; |
705 | ||
706 | now = jiffies; | |
707 | expires = 10*HZ; | |
1da177e4 | 708 | |
0c12295a | 709 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
710 | if (time_after(c->mfc_un.unres.expires, now)) { |
711 | unsigned long interval = c->mfc_un.unres.expires - now; | |
712 | if (interval < expires) | |
713 | expires = interval; | |
1da177e4 LT |
714 | continue; |
715 | } | |
716 | ||
862465f2 | 717 | list_del(&c->list); |
8cd3ac9f | 718 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 719 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
720 | } |
721 | ||
0c12295a PM |
722 | if (!list_empty(&mrt->mfc_unres_queue)) |
723 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
724 | |
725 | out: | |
726 | spin_unlock(&mfc_unres_lock); | |
727 | } | |
728 | ||
729 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
0c12295a | 730 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 731 | unsigned char *ttls) |
1da177e4 LT |
732 | { |
733 | int vifi; | |
734 | ||
735 | cache->mfc_un.res.minvif = MAXVIFS; | |
736 | cache->mfc_un.res.maxvif = 0; | |
737 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
738 | ||
0c12295a PM |
739 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
740 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 741 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
742 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
743 | if (cache->mfc_un.res.minvif > vifi) | |
744 | cache->mfc_un.res.minvif = vifi; | |
745 | if (cache->mfc_un.res.maxvif <= vifi) | |
746 | cache->mfc_un.res.maxvif = vifi + 1; | |
747 | } | |
748 | } | |
90b5ca17 | 749 | cache->mfc_un.res.lastuse = jiffies; |
1da177e4 LT |
750 | } |
751 | ||
0c12295a PM |
752 | static int vif_add(struct net *net, struct mr_table *mrt, |
753 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
754 | { |
755 | int vifi = vifc->vifc_vifi; | |
0c12295a | 756 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
757 | struct net_device *dev; |
758 | struct in_device *in_dev; | |
d607032d | 759 | int err; |
1da177e4 LT |
760 | |
761 | /* Is vif busy ? */ | |
0c12295a | 762 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
763 | return -EADDRINUSE; |
764 | ||
765 | switch (vifc->vifc_flags) { | |
1da177e4 | 766 | case VIFF_REGISTER: |
1973a4ea | 767 | if (!ipmr_pimsm_enabled()) |
c316c629 NA |
768 | return -EINVAL; |
769 | /* Special Purpose VIF in PIM | |
1da177e4 LT |
770 | * All the packets will be sent to the daemon |
771 | */ | |
0c12295a | 772 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 773 | return -EADDRINUSE; |
f0ad0860 | 774 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
775 | if (!dev) |
776 | return -ENOBUFS; | |
d607032d WC |
777 | err = dev_set_allmulti(dev, 1); |
778 | if (err) { | |
779 | unregister_netdevice(dev); | |
7dc00c82 | 780 | dev_put(dev); |
d607032d WC |
781 | return err; |
782 | } | |
1da177e4 | 783 | break; |
e905a9ed | 784 | case VIFF_TUNNEL: |
4feb88e5 | 785 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
786 | if (!dev) |
787 | return -ENOBUFS; | |
d607032d WC |
788 | err = dev_set_allmulti(dev, 1); |
789 | if (err) { | |
790 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 791 | dev_put(dev); |
d607032d WC |
792 | return err; |
793 | } | |
1da177e4 | 794 | break; |
ee5e81f0 | 795 | case VIFF_USE_IFINDEX: |
1da177e4 | 796 | case 0: |
ee5e81f0 I |
797 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
798 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
51456b29 | 799 | if (dev && !__in_dev_get_rtnl(dev)) { |
ee5e81f0 I |
800 | dev_put(dev); |
801 | return -EADDRNOTAVAIL; | |
802 | } | |
a8cb16dd | 803 | } else { |
ee5e81f0 | 804 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 805 | } |
1da177e4 LT |
806 | if (!dev) |
807 | return -EADDRNOTAVAIL; | |
d607032d | 808 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
809 | if (err) { |
810 | dev_put(dev); | |
d607032d | 811 | return err; |
7dc00c82 | 812 | } |
1da177e4 LT |
813 | break; |
814 | default: | |
815 | return -EINVAL; | |
816 | } | |
817 | ||
a8cb16dd ED |
818 | in_dev = __in_dev_get_rtnl(dev); |
819 | if (!in_dev) { | |
d0490cfd | 820 | dev_put(dev); |
1da177e4 | 821 | return -EADDRNOTAVAIL; |
d0490cfd | 822 | } |
42f811b8 | 823 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
3b022865 DA |
824 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_MC_FORWARDING, |
825 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
826 | ip_rt_multicast_event(in_dev); |
827 | ||
a8cb16dd ED |
828 | /* Fill in the VIF structures */ |
829 | ||
c354e124 JK |
830 | v->rate_limit = vifc->vifc_rate_limit; |
831 | v->local = vifc->vifc_lcl_addr.s_addr; | |
832 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
833 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
834 | if (!mrtsock) |
835 | v->flags |= VIFF_STATIC; | |
c354e124 | 836 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
837 | v->bytes_in = 0; |
838 | v->bytes_out = 0; | |
839 | v->pkt_in = 0; | |
840 | v->pkt_out = 0; | |
841 | v->link = dev->ifindex; | |
a8cb16dd | 842 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
a54acb3a | 843 | v->link = dev_get_iflink(dev); |
1da177e4 LT |
844 | |
845 | /* And finish update writing critical data */ | |
846 | write_lock_bh(&mrt_lock); | |
c354e124 | 847 | v->dev = dev; |
a8cb16dd | 848 | if (v->flags & VIFF_REGISTER) |
0c12295a | 849 | mrt->mroute_reg_vif_num = vifi; |
0c12295a PM |
850 | if (vifi+1 > mrt->maxvif) |
851 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
852 | write_unlock_bh(&mrt_lock); |
853 | return 0; | |
854 | } | |
855 | ||
a8c9486b | 856 | /* called with rcu_read_lock() */ |
0c12295a | 857 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
858 | __be32 origin, |
859 | __be32 mcastgrp) | |
1da177e4 | 860 | { |
8fb472c0 NA |
861 | struct mfc_cache_cmp_arg arg = { |
862 | .mfc_mcastgrp = mcastgrp, | |
863 | .mfc_origin = origin | |
864 | }; | |
865 | struct rhlist_head *tmp, *list; | |
1da177e4 LT |
866 | struct mfc_cache *c; |
867 | ||
8fb472c0 NA |
868 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); |
869 | rhl_for_each_entry_rcu(c, tmp, list, mnode) | |
870 | return c; | |
871 | ||
862465f2 | 872 | return NULL; |
1da177e4 LT |
873 | } |
874 | ||
660b26dc ND |
875 | /* Look for a (*,*,oif) entry */ |
876 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, | |
877 | int vifi) | |
878 | { | |
8fb472c0 NA |
879 | struct mfc_cache_cmp_arg arg = { |
880 | .mfc_mcastgrp = htonl(INADDR_ANY), | |
881 | .mfc_origin = htonl(INADDR_ANY) | |
882 | }; | |
883 | struct rhlist_head *tmp, *list; | |
660b26dc ND |
884 | struct mfc_cache *c; |
885 | ||
8fb472c0 NA |
886 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); |
887 | rhl_for_each_entry_rcu(c, tmp, list, mnode) | |
888 | if (c->mfc_un.res.ttls[vifi] < 255) | |
660b26dc ND |
889 | return c; |
890 | ||
891 | return NULL; | |
892 | } | |
893 | ||
894 | /* Look for a (*,G) entry */ | |
895 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
896 | __be32 mcastgrp, int vifi) | |
897 | { | |
8fb472c0 NA |
898 | struct mfc_cache_cmp_arg arg = { |
899 | .mfc_mcastgrp = mcastgrp, | |
900 | .mfc_origin = htonl(INADDR_ANY) | |
901 | }; | |
902 | struct rhlist_head *tmp, *list; | |
660b26dc ND |
903 | struct mfc_cache *c, *proxy; |
904 | ||
360eb5da | 905 | if (mcastgrp == htonl(INADDR_ANY)) |
660b26dc ND |
906 | goto skip; |
907 | ||
8fb472c0 NA |
908 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); |
909 | rhl_for_each_entry_rcu(c, tmp, list, mnode) { | |
910 | if (c->mfc_un.res.ttls[vifi] < 255) | |
911 | return c; | |
912 | ||
913 | /* It's ok if the vifi is part of the static tree */ | |
914 | proxy = ipmr_cache_find_any_parent(mrt, c->mfc_parent); | |
915 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) | |
916 | return c; | |
917 | } | |
660b26dc ND |
918 | |
919 | skip: | |
920 | return ipmr_cache_find_any_parent(mrt, vifi); | |
921 | } | |
922 | ||
8fb472c0 NA |
923 | /* Look for a (S,G,iif) entry if parent != -1 */ |
924 | static struct mfc_cache *ipmr_cache_find_parent(struct mr_table *mrt, | |
925 | __be32 origin, __be32 mcastgrp, | |
926 | int parent) | |
927 | { | |
928 | struct mfc_cache_cmp_arg arg = { | |
929 | .mfc_mcastgrp = mcastgrp, | |
930 | .mfc_origin = origin, | |
931 | }; | |
932 | struct rhlist_head *tmp, *list; | |
933 | struct mfc_cache *c; | |
934 | ||
935 | list = rhltable_lookup(&mrt->mfc_hash, &arg, ipmr_rht_params); | |
936 | rhl_for_each_entry_rcu(c, tmp, list, mnode) | |
937 | if (parent == -1 || parent == c->mfc_parent) | |
938 | return c; | |
939 | ||
940 | return NULL; | |
941 | } | |
942 | ||
7ef8f65d | 943 | /* Allocate a multicast cache entry */ |
d658f8a0 | 944 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 945 | { |
c354e124 | 946 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b | 947 | |
70a0dec4 TG |
948 | if (c) { |
949 | c->mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; | |
a8c9486b | 950 | c->mfc_un.res.minvif = MAXVIFS; |
70a0dec4 | 951 | } |
1da177e4 LT |
952 | return c; |
953 | } | |
954 | ||
d658f8a0 | 955 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 956 | { |
c354e124 | 957 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
958 | |
959 | if (c) { | |
960 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
961 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
962 | } | |
1da177e4 LT |
963 | return c; |
964 | } | |
965 | ||
7ef8f65d | 966 | /* A cache entry has gone into a resolved state from queued */ |
0c12295a PM |
967 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
968 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
969 | { |
970 | struct sk_buff *skb; | |
9ef1d4c7 | 971 | struct nlmsgerr *e; |
1da177e4 | 972 | |
a8cb16dd | 973 | /* Play the pending entries through our router */ |
c354e124 | 974 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 975 | if (ip_hdr(skb)->version == 0) { |
af72868b JB |
976 | struct nlmsghdr *nlh = skb_pull(skb, |
977 | sizeof(struct iphdr)); | |
1da177e4 | 978 | |
573ce260 | 979 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
a8cb16dd ED |
980 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
981 | (u8 *)nlh; | |
1da177e4 LT |
982 | } else { |
983 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 984 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 985 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 986 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
987 | e->error = -EMSGSIZE; |
988 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 989 | } |
2942e900 | 990 | |
15e47304 | 991 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 992 | } else { |
4b1f0d33 | 993 | ip_mr_forward(net, mrt, skb->dev, skb, c, 0); |
a8cb16dd | 994 | } |
1da177e4 LT |
995 | } |
996 | } | |
997 | ||
c316c629 NA |
998 | /* Bounce a cache query up to mrouted. We could use netlink for this but mrouted |
999 | * expects the following bizarre scheme. | |
1da177e4 | 1000 | * |
c316c629 | 1001 | * Called under mrt_lock. |
1da177e4 | 1002 | */ |
0c12295a | 1003 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 1004 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 | 1005 | { |
c9bdd4b5 | 1006 | const int ihl = ip_hdrlen(pkt); |
c316c629 | 1007 | struct sock *mroute_sk; |
1da177e4 LT |
1008 | struct igmphdr *igmp; |
1009 | struct igmpmsg *msg; | |
c316c629 | 1010 | struct sk_buff *skb; |
1da177e4 LT |
1011 | int ret; |
1012 | ||
1da177e4 LT |
1013 | if (assert == IGMPMSG_WHOLEPKT) |
1014 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
1015 | else | |
1da177e4 LT |
1016 | skb = alloc_skb(128, GFP_ATOMIC); |
1017 | ||
132adf54 | 1018 | if (!skb) |
1da177e4 LT |
1019 | return -ENOBUFS; |
1020 | ||
1da177e4 LT |
1021 | if (assert == IGMPMSG_WHOLEPKT) { |
1022 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
1023 | * Duplicate old header, fix ihl, length etc. |
1024 | * And all this only to mangle msg->im_msgtype and | |
1025 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 1026 | */ |
878c8145 ACM |
1027 | skb_push(skb, sizeof(struct iphdr)); |
1028 | skb_reset_network_header(skb); | |
badff6d0 | 1029 | skb_reset_transport_header(skb); |
0272ffc4 | 1030 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 1031 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
1032 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
1033 | msg->im_mbz = 0; | |
0c12295a | 1034 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
1035 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
1036 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
1037 | sizeof(struct iphdr)); | |
c316c629 NA |
1038 | } else { |
1039 | /* Copy the IP header */ | |
1040 | skb_set_network_header(skb, skb->len); | |
1041 | skb_put(skb, ihl); | |
1042 | skb_copy_to_linear_data(skb, pkt->data, ihl); | |
1043 | /* Flag to the kernel this is a route add */ | |
1044 | ip_hdr(skb)->protocol = 0; | |
1045 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1046 | msg->im_vif = vifi; | |
1047 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); | |
1048 | /* Add our header */ | |
4df864c1 | 1049 | igmp = skb_put(skb, sizeof(struct igmphdr)); |
c316c629 NA |
1050 | igmp->type = assert; |
1051 | msg->im_msgtype = assert; | |
1052 | igmp->code = 0; | |
1053 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
1054 | skb->transport_header = skb->network_header; | |
e905a9ed | 1055 | } |
1da177e4 | 1056 | |
4c968709 ED |
1057 | rcu_read_lock(); |
1058 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
51456b29 | 1059 | if (!mroute_sk) { |
4c968709 | 1060 | rcu_read_unlock(); |
1da177e4 LT |
1061 | kfree_skb(skb); |
1062 | return -EINVAL; | |
1063 | } | |
1064 | ||
a8cb16dd | 1065 | /* Deliver to mrouted */ |
4c968709 ED |
1066 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1067 | rcu_read_unlock(); | |
70a269e6 | 1068 | if (ret < 0) { |
e87cc472 | 1069 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1070 | kfree_skb(skb); |
1071 | } | |
1072 | ||
1073 | return ret; | |
1074 | } | |
1075 | ||
7ef8f65d NA |
1076 | /* Queue a packet for resolution. It gets locked cache entry! */ |
1077 | static int ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, | |
4b1f0d33 | 1078 | struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 1079 | { |
8fb472c0 NA |
1080 | const struct iphdr *iph = ip_hdr(skb); |
1081 | struct mfc_cache *c; | |
862465f2 | 1082 | bool found = false; |
1da177e4 | 1083 | int err; |
1da177e4 LT |
1084 | |
1085 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1086 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1087 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1088 | c->mfc_origin == iph->saddr) { |
1089 | found = true; | |
1da177e4 | 1090 | break; |
862465f2 | 1091 | } |
1da177e4 LT |
1092 | } |
1093 | ||
862465f2 | 1094 | if (!found) { |
a8cb16dd | 1095 | /* Create a new entry if allowable */ |
0c12295a | 1096 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1097 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1098 | spin_unlock_bh(&mfc_unres_lock); |
1099 | ||
1100 | kfree_skb(skb); | |
1101 | return -ENOBUFS; | |
1102 | } | |
1103 | ||
a8cb16dd | 1104 | /* Fill in the new cache entry */ |
eddc9ec5 ACM |
1105 | c->mfc_parent = -1; |
1106 | c->mfc_origin = iph->saddr; | |
1107 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1108 | |
a8cb16dd | 1109 | /* Reflect first query at mrouted. */ |
0c12295a | 1110 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1111 | if (err < 0) { |
e905a9ed | 1112 | /* If the report failed throw the cache entry |
1da177e4 LT |
1113 | out - Brad Parker |
1114 | */ | |
1115 | spin_unlock_bh(&mfc_unres_lock); | |
1116 | ||
5c0a66f5 | 1117 | ipmr_cache_free(c); |
1da177e4 LT |
1118 | kfree_skb(skb); |
1119 | return err; | |
1120 | } | |
1121 | ||
0c12295a PM |
1122 | atomic_inc(&mrt->cache_resolve_queue_len); |
1123 | list_add(&c->list, &mrt->mfc_unres_queue); | |
8cd3ac9f | 1124 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1125 | |
278554bd DM |
1126 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1127 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1128 | } |
1129 | ||
a8cb16dd | 1130 | /* See if we can append the packet */ |
a8cb16dd | 1131 | if (c->mfc_un.unres.unresolved.qlen > 3) { |
1da177e4 LT |
1132 | kfree_skb(skb); |
1133 | err = -ENOBUFS; | |
1134 | } else { | |
4b1f0d33 DS |
1135 | if (dev) { |
1136 | skb->dev = dev; | |
1137 | skb->skb_iif = dev->ifindex; | |
1138 | } | |
c354e124 | 1139 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1140 | err = 0; |
1141 | } | |
1142 | ||
1143 | spin_unlock_bh(&mfc_unres_lock); | |
1144 | return err; | |
1145 | } | |
1146 | ||
7ef8f65d | 1147 | /* MFC cache manipulation by user space mroute daemon */ |
1da177e4 | 1148 | |
660b26dc | 1149 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 | 1150 | { |
8fb472c0 | 1151 | struct mfc_cache *c; |
1da177e4 | 1152 | |
8fb472c0 NA |
1153 | /* The entries are added/deleted only under RTNL */ |
1154 | rcu_read_lock(); | |
1155 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1156 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1157 | rcu_read_unlock(); | |
1158 | if (!c) | |
1159 | return -ENOENT; | |
1160 | rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); | |
1161 | list_del_rcu(&c->list); | |
1162 | mroute_netlink_event(mrt, c, RTM_DELROUTE); | |
1163 | ipmr_cache_free(c); | |
1da177e4 | 1164 | |
8fb472c0 | 1165 | return 0; |
1da177e4 LT |
1166 | } |
1167 | ||
0c12295a | 1168 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1169 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1170 | { |
862465f2 | 1171 | struct mfc_cache *uc, *c; |
8fb472c0 NA |
1172 | bool found; |
1173 | int ret; | |
1da177e4 | 1174 | |
a50436f2 PM |
1175 | if (mfc->mfcc_parent >= MAXVIFS) |
1176 | return -ENFILE; | |
1177 | ||
8fb472c0 NA |
1178 | /* The entries are added/deleted only under RTNL */ |
1179 | rcu_read_lock(); | |
1180 | c = ipmr_cache_find_parent(mrt, mfc->mfcc_origin.s_addr, | |
1181 | mfc->mfcc_mcastgrp.s_addr, parent); | |
1182 | rcu_read_unlock(); | |
1183 | if (c) { | |
1da177e4 LT |
1184 | write_lock_bh(&mrt_lock); |
1185 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1186 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1187 | if (!mrtsock) |
1188 | c->mfc_flags |= MFC_STATIC; | |
1189 | write_unlock_bh(&mrt_lock); | |
8cd3ac9f | 1190 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1191 | return 0; |
1192 | } | |
1193 | ||
360eb5da | 1194 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1195 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1196 | return -EINVAL; |
1197 | ||
d658f8a0 | 1198 | c = ipmr_cache_alloc(); |
51456b29 | 1199 | if (!c) |
1da177e4 LT |
1200 | return -ENOMEM; |
1201 | ||
c354e124 JK |
1202 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1203 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1204 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1205 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1206 | if (!mrtsock) |
1207 | c->mfc_flags |= MFC_STATIC; | |
1208 | ||
8fb472c0 NA |
1209 | ret = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->mnode, |
1210 | ipmr_rht_params); | |
1211 | if (ret) { | |
1212 | pr_err("ipmr: rhtable insert error %d\n", ret); | |
1213 | ipmr_cache_free(c); | |
1214 | return ret; | |
1215 | } | |
1216 | list_add_tail_rcu(&c->list, &mrt->mfc_cache_list); | |
7ef8f65d NA |
1217 | /* Check to see if we resolved a queued list. If so we |
1218 | * need to send on the frames and tidy up. | |
1da177e4 | 1219 | */ |
b0ebb739 | 1220 | found = false; |
1da177e4 | 1221 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1222 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1223 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1224 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1225 | list_del(&uc->list); |
0c12295a | 1226 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1227 | found = true; |
1da177e4 LT |
1228 | break; |
1229 | } | |
1230 | } | |
0c12295a PM |
1231 | if (list_empty(&mrt->mfc_unres_queue)) |
1232 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1233 | spin_unlock_bh(&mfc_unres_lock); |
1234 | ||
b0ebb739 | 1235 | if (found) { |
0c12295a | 1236 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1237 | ipmr_cache_free(uc); |
1da177e4 | 1238 | } |
8cd3ac9f | 1239 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1240 | return 0; |
1241 | } | |
1242 | ||
7ef8f65d | 1243 | /* Close the multicast socket, and clear the vif tables etc */ |
0e615e96 | 1244 | static void mroute_clean_tables(struct mr_table *mrt, bool all) |
1da177e4 | 1245 | { |
8fb472c0 | 1246 | struct mfc_cache *c, *tmp; |
d17fa6fa | 1247 | LIST_HEAD(list); |
8fb472c0 | 1248 | int i; |
e905a9ed | 1249 | |
a8cb16dd | 1250 | /* Shut down all active vif entries */ |
0c12295a | 1251 | for (i = 0; i < mrt->maxvif; i++) { |
0e615e96 NA |
1252 | if (!all && (mrt->vif_table[i].flags & VIFF_STATIC)) |
1253 | continue; | |
1254 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1255 | } |
d17fa6fa | 1256 | unregister_netdevice_many(&list); |
1da177e4 | 1257 | |
a8cb16dd | 1258 | /* Wipe the cache */ |
8fb472c0 NA |
1259 | list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { |
1260 | if (!all && (c->mfc_flags & MFC_STATIC)) | |
1261 | continue; | |
1262 | rhltable_remove(&mrt->mfc_hash, &c->mnode, ipmr_rht_params); | |
1263 | list_del_rcu(&c->list); | |
1264 | mroute_netlink_event(mrt, c, RTM_DELROUTE); | |
1265 | ipmr_cache_free(c); | |
1da177e4 LT |
1266 | } |
1267 | ||
0c12295a | 1268 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1269 | spin_lock_bh(&mfc_unres_lock); |
8fb472c0 | 1270 | list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { |
862465f2 | 1271 | list_del(&c->list); |
8cd3ac9f | 1272 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 1273 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1274 | } |
1275 | spin_unlock_bh(&mfc_unres_lock); | |
1276 | } | |
1277 | } | |
1278 | ||
4c968709 ED |
1279 | /* called from ip_ra_control(), before an RCU grace period, |
1280 | * we dont need to call synchronize_rcu() here | |
1281 | */ | |
1da177e4 LT |
1282 | static void mrtsock_destruct(struct sock *sk) |
1283 | { | |
4feb88e5 | 1284 | struct net *net = sock_net(sk); |
f0ad0860 | 1285 | struct mr_table *mrt; |
4feb88e5 | 1286 | |
1215e51e | 1287 | ASSERT_RTNL(); |
f0ad0860 | 1288 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1289 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1290 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
3b022865 DA |
1291 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1292 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1293 | NETCONFA_IFINDEX_ALL, |
1294 | net->ipv4.devconf_all); | |
a9b3cd7f | 1295 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
0e615e96 | 1296 | mroute_clean_tables(mrt, false); |
f0ad0860 | 1297 | } |
1da177e4 | 1298 | } |
1da177e4 LT |
1299 | } |
1300 | ||
7ef8f65d NA |
1301 | /* Socket options and virtual interface manipulation. The whole |
1302 | * virtual interface system is a complete heap, but unfortunately | |
1303 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1304 | * MOSPF/PIM router set up we can clean this up. | |
1da177e4 | 1305 | */ |
e905a9ed | 1306 | |
29e97d21 NA |
1307 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, |
1308 | unsigned int optlen) | |
1da177e4 | 1309 | { |
4feb88e5 | 1310 | struct net *net = sock_net(sk); |
29e97d21 | 1311 | int val, ret = 0, parent = 0; |
f0ad0860 | 1312 | struct mr_table *mrt; |
29e97d21 NA |
1313 | struct vifctl vif; |
1314 | struct mfcctl mfc; | |
1315 | u32 uval; | |
f0ad0860 | 1316 | |
29e97d21 NA |
1317 | /* There's one exception to the lock - MRT_DONE which needs to unlock */ |
1318 | rtnl_lock(); | |
5e1859fb | 1319 | if (sk->sk_type != SOCK_RAW || |
29e97d21 NA |
1320 | inet_sk(sk)->inet_num != IPPROTO_IGMP) { |
1321 | ret = -EOPNOTSUPP; | |
1322 | goto out_unlock; | |
1323 | } | |
5e1859fb | 1324 | |
f0ad0860 | 1325 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
29e97d21 NA |
1326 | if (!mrt) { |
1327 | ret = -ENOENT; | |
1328 | goto out_unlock; | |
1329 | } | |
132adf54 | 1330 | if (optname != MRT_INIT) { |
33d480ce | 1331 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
29e97d21 NA |
1332 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) { |
1333 | ret = -EACCES; | |
1334 | goto out_unlock; | |
1335 | } | |
1da177e4 LT |
1336 | } |
1337 | ||
132adf54 SH |
1338 | switch (optname) { |
1339 | case MRT_INIT: | |
42e6b89c | 1340 | if (optlen != sizeof(int)) { |
29e97d21 | 1341 | ret = -EINVAL; |
42e6b89c NA |
1342 | break; |
1343 | } | |
1344 | if (rtnl_dereference(mrt->mroute_sk)) { | |
29e97d21 | 1345 | ret = -EADDRINUSE; |
29e97d21 | 1346 | break; |
42e6b89c | 1347 | } |
132adf54 SH |
1348 | |
1349 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1350 | if (ret == 0) { | |
cf778b00 | 1351 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1352 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
3b022865 DA |
1353 | inet_netconf_notify_devconf(net, RTM_NEWNETCONF, |
1354 | NETCONFA_MC_FORWARDING, | |
d67b8c61 ND |
1355 | NETCONFA_IFINDEX_ALL, |
1356 | net->ipv4.devconf_all); | |
132adf54 | 1357 | } |
29e97d21 | 1358 | break; |
132adf54 | 1359 | case MRT_DONE: |
29e97d21 NA |
1360 | if (sk != rcu_access_pointer(mrt->mroute_sk)) { |
1361 | ret = -EACCES; | |
1362 | } else { | |
29e97d21 | 1363 | ret = ip_ra_control(sk, 0, NULL); |
1215e51e | 1364 | goto out_unlock; |
29e97d21 NA |
1365 | } |
1366 | break; | |
132adf54 SH |
1367 | case MRT_ADD_VIF: |
1368 | case MRT_DEL_VIF: | |
29e97d21 NA |
1369 | if (optlen != sizeof(vif)) { |
1370 | ret = -EINVAL; | |
1371 | break; | |
1372 | } | |
1373 | if (copy_from_user(&vif, optval, sizeof(vif))) { | |
1374 | ret = -EFAULT; | |
1375 | break; | |
1376 | } | |
1377 | if (vif.vifc_vifi >= MAXVIFS) { | |
1378 | ret = -ENFILE; | |
1379 | break; | |
1380 | } | |
c354e124 | 1381 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1382 | ret = vif_add(net, mrt, &vif, |
1383 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1384 | } else { |
0c12295a | 1385 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 | 1386 | } |
29e97d21 | 1387 | break; |
7ef8f65d NA |
1388 | /* Manipulate the forwarding caches. These live |
1389 | * in a sort of kernel/user symbiosis. | |
1390 | */ | |
132adf54 SH |
1391 | case MRT_ADD_MFC: |
1392 | case MRT_DEL_MFC: | |
660b26dc ND |
1393 | parent = -1; |
1394 | case MRT_ADD_MFC_PROXY: | |
1395 | case MRT_DEL_MFC_PROXY: | |
29e97d21 NA |
1396 | if (optlen != sizeof(mfc)) { |
1397 | ret = -EINVAL; | |
1398 | break; | |
1399 | } | |
1400 | if (copy_from_user(&mfc, optval, sizeof(mfc))) { | |
1401 | ret = -EFAULT; | |
1402 | break; | |
1403 | } | |
660b26dc ND |
1404 | if (parent == 0) |
1405 | parent = mfc.mfcc_parent; | |
660b26dc ND |
1406 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1407 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1408 | else |
4c968709 | 1409 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1410 | sk == rtnl_dereference(mrt->mroute_sk), |
1411 | parent); | |
29e97d21 | 1412 | break; |
7ef8f65d | 1413 | /* Control PIM assert. */ |
132adf54 | 1414 | case MRT_ASSERT: |
29e97d21 NA |
1415 | if (optlen != sizeof(val)) { |
1416 | ret = -EINVAL; | |
1417 | break; | |
1418 | } | |
1419 | if (get_user(val, (int __user *)optval)) { | |
1420 | ret = -EFAULT; | |
1421 | break; | |
1422 | } | |
1423 | mrt->mroute_do_assert = val; | |
1424 | break; | |
132adf54 | 1425 | case MRT_PIM: |
1973a4ea | 1426 | if (!ipmr_pimsm_enabled()) { |
29e97d21 NA |
1427 | ret = -ENOPROTOOPT; |
1428 | break; | |
1429 | } | |
1430 | if (optlen != sizeof(val)) { | |
1431 | ret = -EINVAL; | |
1432 | break; | |
1433 | } | |
1434 | if (get_user(val, (int __user *)optval)) { | |
1435 | ret = -EFAULT; | |
1436 | break; | |
1437 | } | |
ba93ef74 | 1438 | |
29e97d21 NA |
1439 | val = !!val; |
1440 | if (val != mrt->mroute_do_pim) { | |
1441 | mrt->mroute_do_pim = val; | |
1442 | mrt->mroute_do_assert = val; | |
1da177e4 | 1443 | } |
29e97d21 | 1444 | break; |
f0ad0860 | 1445 | case MRT_TABLE: |
29e97d21 NA |
1446 | if (!IS_BUILTIN(CONFIG_IP_MROUTE_MULTIPLE_TABLES)) { |
1447 | ret = -ENOPROTOOPT; | |
1448 | break; | |
1449 | } | |
1450 | if (optlen != sizeof(uval)) { | |
1451 | ret = -EINVAL; | |
1452 | break; | |
1453 | } | |
1454 | if (get_user(uval, (u32 __user *)optval)) { | |
1455 | ret = -EFAULT; | |
1456 | break; | |
1457 | } | |
f0ad0860 | 1458 | |
4c968709 ED |
1459 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1460 | ret = -EBUSY; | |
1461 | } else { | |
29e97d21 | 1462 | mrt = ipmr_new_table(net, uval); |
1113ebbc NA |
1463 | if (IS_ERR(mrt)) |
1464 | ret = PTR_ERR(mrt); | |
5e1859fb | 1465 | else |
29e97d21 | 1466 | raw_sk(sk)->ipmr_table = uval; |
4c968709 | 1467 | } |
29e97d21 | 1468 | break; |
7ef8f65d | 1469 | /* Spurious command, or MRT_VERSION which you cannot set. */ |
132adf54 | 1470 | default: |
29e97d21 | 1471 | ret = -ENOPROTOOPT; |
1da177e4 | 1472 | } |
29e97d21 NA |
1473 | out_unlock: |
1474 | rtnl_unlock(); | |
29e97d21 | 1475 | return ret; |
1da177e4 LT |
1476 | } |
1477 | ||
7ef8f65d | 1478 | /* Getsock opt support for the multicast routing system. */ |
c354e124 | 1479 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1480 | { |
1481 | int olr; | |
1482 | int val; | |
4feb88e5 | 1483 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1484 | struct mr_table *mrt; |
1485 | ||
5e1859fb ED |
1486 | if (sk->sk_type != SOCK_RAW || |
1487 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1488 | return -EOPNOTSUPP; | |
1489 | ||
f0ad0860 | 1490 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1491 | if (!mrt) |
f0ad0860 | 1492 | return -ENOENT; |
1da177e4 | 1493 | |
fe9ef3ce NA |
1494 | switch (optname) { |
1495 | case MRT_VERSION: | |
1496 | val = 0x0305; | |
1497 | break; | |
1498 | case MRT_PIM: | |
1973a4ea | 1499 | if (!ipmr_pimsm_enabled()) |
fe9ef3ce NA |
1500 | return -ENOPROTOOPT; |
1501 | val = mrt->mroute_do_pim; | |
1502 | break; | |
1503 | case MRT_ASSERT: | |
1504 | val = mrt->mroute_do_assert; | |
1505 | break; | |
1506 | default: | |
1da177e4 | 1507 | return -ENOPROTOOPT; |
fe9ef3ce | 1508 | } |
1da177e4 LT |
1509 | |
1510 | if (get_user(olr, optlen)) | |
1511 | return -EFAULT; | |
1da177e4 LT |
1512 | olr = min_t(unsigned int, olr, sizeof(int)); |
1513 | if (olr < 0) | |
1514 | return -EINVAL; | |
c354e124 | 1515 | if (put_user(olr, optlen)) |
1da177e4 | 1516 | return -EFAULT; |
c354e124 | 1517 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1518 | return -EFAULT; |
1519 | return 0; | |
1520 | } | |
1521 | ||
7ef8f65d | 1522 | /* The IP multicast ioctl support routines. */ |
1da177e4 LT |
1523 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1524 | { | |
1525 | struct sioc_sg_req sr; | |
1526 | struct sioc_vif_req vr; | |
1527 | struct vif_device *vif; | |
1528 | struct mfc_cache *c; | |
4feb88e5 | 1529 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1530 | struct mr_table *mrt; |
1531 | ||
1532 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1533 | if (!mrt) |
f0ad0860 | 1534 | return -ENOENT; |
e905a9ed | 1535 | |
132adf54 SH |
1536 | switch (cmd) { |
1537 | case SIOCGETVIFCNT: | |
c354e124 | 1538 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1539 | return -EFAULT; |
0c12295a | 1540 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1541 | return -EINVAL; |
1542 | read_lock(&mrt_lock); | |
0c12295a PM |
1543 | vif = &mrt->vif_table[vr.vifi]; |
1544 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1545 | vr.icount = vif->pkt_in; |
1546 | vr.ocount = vif->pkt_out; | |
1547 | vr.ibytes = vif->bytes_in; | |
1548 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1549 | read_unlock(&mrt_lock); |
1da177e4 | 1550 | |
c354e124 | 1551 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1552 | return -EFAULT; |
1553 | return 0; | |
1554 | } | |
1555 | read_unlock(&mrt_lock); | |
1556 | return -EADDRNOTAVAIL; | |
1557 | case SIOCGETSGCNT: | |
c354e124 | 1558 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1559 | return -EFAULT; |
1560 | ||
a8c9486b | 1561 | rcu_read_lock(); |
0c12295a | 1562 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1563 | if (c) { |
1564 | sr.pktcnt = c->mfc_un.res.pkt; | |
1565 | sr.bytecnt = c->mfc_un.res.bytes; | |
1566 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1567 | rcu_read_unlock(); |
132adf54 | 1568 | |
c354e124 | 1569 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1570 | return -EFAULT; |
1571 | return 0; | |
1572 | } | |
a8c9486b | 1573 | rcu_read_unlock(); |
132adf54 SH |
1574 | return -EADDRNOTAVAIL; |
1575 | default: | |
1576 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1577 | } |
1578 | } | |
1579 | ||
709b46e8 EB |
1580 | #ifdef CONFIG_COMPAT |
1581 | struct compat_sioc_sg_req { | |
1582 | struct in_addr src; | |
1583 | struct in_addr grp; | |
1584 | compat_ulong_t pktcnt; | |
1585 | compat_ulong_t bytecnt; | |
1586 | compat_ulong_t wrong_if; | |
1587 | }; | |
1588 | ||
ca6b8bb0 DM |
1589 | struct compat_sioc_vif_req { |
1590 | vifi_t vifi; /* Which iface */ | |
1591 | compat_ulong_t icount; | |
1592 | compat_ulong_t ocount; | |
1593 | compat_ulong_t ibytes; | |
1594 | compat_ulong_t obytes; | |
1595 | }; | |
1596 | ||
709b46e8 EB |
1597 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1598 | { | |
0033d5ad | 1599 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1600 | struct compat_sioc_vif_req vr; |
1601 | struct vif_device *vif; | |
709b46e8 EB |
1602 | struct mfc_cache *c; |
1603 | struct net *net = sock_net(sk); | |
1604 | struct mr_table *mrt; | |
1605 | ||
1606 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1607 | if (!mrt) |
709b46e8 EB |
1608 | return -ENOENT; |
1609 | ||
1610 | switch (cmd) { | |
ca6b8bb0 DM |
1611 | case SIOCGETVIFCNT: |
1612 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1613 | return -EFAULT; | |
1614 | if (vr.vifi >= mrt->maxvif) | |
1615 | return -EINVAL; | |
1616 | read_lock(&mrt_lock); | |
1617 | vif = &mrt->vif_table[vr.vifi]; | |
1618 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1619 | vr.icount = vif->pkt_in; | |
1620 | vr.ocount = vif->pkt_out; | |
1621 | vr.ibytes = vif->bytes_in; | |
1622 | vr.obytes = vif->bytes_out; | |
1623 | read_unlock(&mrt_lock); | |
1624 | ||
1625 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1626 | return -EFAULT; | |
1627 | return 0; | |
1628 | } | |
1629 | read_unlock(&mrt_lock); | |
1630 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1631 | case SIOCGETSGCNT: |
1632 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1633 | return -EFAULT; | |
1634 | ||
1635 | rcu_read_lock(); | |
1636 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1637 | if (c) { | |
1638 | sr.pktcnt = c->mfc_un.res.pkt; | |
1639 | sr.bytecnt = c->mfc_un.res.bytes; | |
1640 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1641 | rcu_read_unlock(); | |
1642 | ||
1643 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1644 | return -EFAULT; | |
1645 | return 0; | |
1646 | } | |
1647 | rcu_read_unlock(); | |
1648 | return -EADDRNOTAVAIL; | |
1649 | default: | |
1650 | return -ENOIOCTLCMD; | |
1651 | } | |
1652 | } | |
1653 | #endif | |
1654 | ||
1da177e4 LT |
1655 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) |
1656 | { | |
351638e7 | 1657 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1658 | struct net *net = dev_net(dev); |
f0ad0860 | 1659 | struct mr_table *mrt; |
1da177e4 LT |
1660 | struct vif_device *v; |
1661 | int ct; | |
e9dc8653 | 1662 | |
1da177e4 LT |
1663 | if (event != NETDEV_UNREGISTER) |
1664 | return NOTIFY_DONE; | |
f0ad0860 PM |
1665 | |
1666 | ipmr_for_each_table(mrt, net) { | |
1667 | v = &mrt->vif_table[0]; | |
1668 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1669 | if (v->dev == dev) | |
e92036a6 | 1670 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1671 | } |
1da177e4 LT |
1672 | } |
1673 | return NOTIFY_DONE; | |
1674 | } | |
1675 | ||
c354e124 | 1676 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1677 | .notifier_call = ipmr_device_event, |
1678 | }; | |
1679 | ||
7ef8f65d NA |
1680 | /* Encapsulate a packet by attaching a valid IPIP header to it. |
1681 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1682 | * important for multicast video. | |
1da177e4 | 1683 | */ |
b6a7719a HFS |
1684 | static void ip_encap(struct net *net, struct sk_buff *skb, |
1685 | __be32 saddr, __be32 daddr) | |
1da177e4 | 1686 | { |
8856dfa3 | 1687 | struct iphdr *iph; |
b71d1d42 | 1688 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1689 | |
1690 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1691 | skb->transport_header = skb->network_header; |
8856dfa3 | 1692 | skb_reset_network_header(skb); |
eddc9ec5 | 1693 | iph = ip_hdr(skb); |
1da177e4 | 1694 | |
a8cb16dd | 1695 | iph->version = 4; |
e023dd64 ACM |
1696 | iph->tos = old_iph->tos; |
1697 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1698 | iph->frag_off = 0; |
1699 | iph->daddr = daddr; | |
1700 | iph->saddr = saddr; | |
1701 | iph->protocol = IPPROTO_IPIP; | |
1702 | iph->ihl = 5; | |
1703 | iph->tot_len = htons(skb->len); | |
b6a7719a | 1704 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1705 | ip_send_check(iph); |
1706 | ||
1da177e4 LT |
1707 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1708 | nf_reset(skb); | |
1709 | } | |
1710 | ||
0c4b51f0 EB |
1711 | static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
1712 | struct sk_buff *skb) | |
1da177e4 | 1713 | { |
a8cb16dd | 1714 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1715 | |
73186df8 DM |
1716 | IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
1717 | IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); | |
1da177e4 LT |
1718 | |
1719 | if (unlikely(opt->optlen)) | |
1720 | ip_forward_options(skb); | |
1721 | ||
13206b6b | 1722 | return dst_output(net, sk, skb); |
1da177e4 LT |
1723 | } |
1724 | ||
7ef8f65d | 1725 | /* Processing handlers for ipmr_forward */ |
1da177e4 | 1726 | |
0c12295a PM |
1727 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1728 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1729 | { |
eddc9ec5 | 1730 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1731 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1732 | struct net_device *dev; |
1733 | struct rtable *rt; | |
31e4543d | 1734 | struct flowi4 fl4; |
1da177e4 LT |
1735 | int encap = 0; |
1736 | ||
51456b29 | 1737 | if (!vif->dev) |
1da177e4 LT |
1738 | goto out_free; |
1739 | ||
1da177e4 LT |
1740 | if (vif->flags & VIFF_REGISTER) { |
1741 | vif->pkt_out++; | |
c354e124 | 1742 | vif->bytes_out += skb->len; |
cf3677ae PE |
1743 | vif->dev->stats.tx_bytes += skb->len; |
1744 | vif->dev->stats.tx_packets++; | |
0c12295a | 1745 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1746 | goto out_free; |
1da177e4 | 1747 | } |
1da177e4 | 1748 | |
a8cb16dd | 1749 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1750 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1751 | vif->remote, vif->local, |
1752 | 0, 0, | |
1753 | IPPROTO_IPIP, | |
1754 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1755 | if (IS_ERR(rt)) |
1da177e4 LT |
1756 | goto out_free; |
1757 | encap = sizeof(struct iphdr); | |
1758 | } else { | |
31e4543d | 1759 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1760 | 0, 0, |
1761 | IPPROTO_IPIP, | |
1762 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1763 | if (IS_ERR(rt)) |
1da177e4 LT |
1764 | goto out_free; |
1765 | } | |
1766 | ||
d8d1f30b | 1767 | dev = rt->dst.dev; |
1da177e4 | 1768 | |
d8d1f30b | 1769 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1770 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1771 | * allow to send ICMP, so that packets will disappear |
1772 | * to blackhole. | |
1da177e4 | 1773 | */ |
73186df8 | 1774 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1775 | ip_rt_put(rt); |
1776 | goto out_free; | |
1777 | } | |
1778 | ||
d8d1f30b | 1779 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1780 | |
1781 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1782 | ip_rt_put(rt); |
1da177e4 LT |
1783 | goto out_free; |
1784 | } | |
1785 | ||
1786 | vif->pkt_out++; | |
c354e124 | 1787 | vif->bytes_out += skb->len; |
1da177e4 | 1788 | |
adf30907 | 1789 | skb_dst_drop(skb); |
d8d1f30b | 1790 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1791 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1792 | |
1793 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1794 | * What do we do with netfilter? -- RR |
1795 | */ | |
1da177e4 | 1796 | if (vif->flags & VIFF_TUNNEL) { |
b6a7719a | 1797 | ip_encap(net, skb, vif->local, vif->remote); |
1da177e4 | 1798 | /* FIXME: extra output firewall step used to be here. --RR */ |
2f4c02d4 PE |
1799 | vif->dev->stats.tx_packets++; |
1800 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1801 | } |
1802 | ||
9ee6c5dc | 1803 | IPCB(skb)->flags |= IPSKB_FORWARDED; |
1da177e4 | 1804 | |
7ef8f65d | 1805 | /* RFC1584 teaches, that DVMRP/PIM router must deliver packets locally |
1da177e4 LT |
1806 | * not only before forwarding, but after forwarding on all output |
1807 | * interfaces. It is clear, if mrouter runs a multicasting | |
1808 | * program, it should receive packets not depending to what interface | |
1809 | * program is joined. | |
1810 | * If we will not make it, the program will have to join on all | |
1811 | * interfaces. On the other hand, multihoming host (or router, but | |
1812 | * not mrouter) cannot join to more than one interface - it will | |
1813 | * result in receiving multiple packets. | |
1814 | */ | |
29a26a56 EB |
1815 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, |
1816 | net, NULL, skb, skb->dev, dev, | |
1da177e4 LT |
1817 | ipmr_forward_finish); |
1818 | return; | |
1819 | ||
1820 | out_free: | |
1821 | kfree_skb(skb); | |
1da177e4 LT |
1822 | } |
1823 | ||
0c12295a | 1824 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1825 | { |
1826 | int ct; | |
0c12295a PM |
1827 | |
1828 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1829 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1830 | break; |
1831 | } | |
1832 | return ct; | |
1833 | } | |
1834 | ||
1835 | /* "local" means that we should preserve one skb (for local delivery) */ | |
c4854ec8 | 1836 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
4b1f0d33 DS |
1837 | struct net_device *dev, struct sk_buff *skb, |
1838 | struct mfc_cache *cache, int local) | |
1da177e4 | 1839 | { |
4b1f0d33 | 1840 | int true_vifi = ipmr_find_vif(mrt, dev); |
1da177e4 LT |
1841 | int psend = -1; |
1842 | int vif, ct; | |
1843 | ||
1844 | vif = cache->mfc_parent; | |
1845 | cache->mfc_un.res.pkt++; | |
1846 | cache->mfc_un.res.bytes += skb->len; | |
43b9e127 | 1847 | cache->mfc_un.res.lastuse = jiffies; |
1da177e4 | 1848 | |
360eb5da | 1849 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1850 | struct mfc_cache *cache_proxy; |
1851 | ||
1852 | /* For an (*,G) entry, we only check that the incomming | |
1853 | * interface is part of the static tree. | |
1854 | */ | |
1855 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); | |
1856 | if (cache_proxy && | |
1857 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) | |
1858 | goto forward; | |
1859 | } | |
1860 | ||
7ef8f65d | 1861 | /* Wrong interface: drop packet and (maybe) send PIM assert. */ |
4b1f0d33 | 1862 | if (mrt->vif_table[vif].dev != dev) { |
c7537967 | 1863 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1864 | /* It is our own packet, looped back. |
a8cb16dd ED |
1865 | * Very complicated situation... |
1866 | * | |
1867 | * The best workaround until routing daemons will be | |
1868 | * fixed is not to redistribute packet, if it was | |
1869 | * send through wrong interface. It means, that | |
1870 | * multicast applications WILL NOT work for | |
1871 | * (S,G), which have default multicast route pointing | |
1872 | * to wrong oif. In any case, it is not a good | |
1873 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1874 | */ |
1875 | goto dont_forward; | |
1876 | } | |
1877 | ||
1878 | cache->mfc_un.res.wrong_if++; | |
1da177e4 | 1879 | |
0c12295a | 1880 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1881 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1882 | * so that we cannot check that packet arrived on an oif. |
1883 | * It is bad, but otherwise we would need to move pretty | |
1884 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1885 | */ |
0c12295a | 1886 | (mrt->mroute_do_pim || |
6f9374a9 | 1887 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1888 | time_after(jiffies, |
1da177e4 LT |
1889 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1890 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1891 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1892 | } |
1893 | goto dont_forward; | |
1894 | } | |
1895 | ||
660b26dc | 1896 | forward: |
0c12295a PM |
1897 | mrt->vif_table[vif].pkt_in++; |
1898 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 | 1899 | |
7ef8f65d | 1900 | /* Forward the frame */ |
360eb5da ND |
1901 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
1902 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc ND |
1903 | if (true_vifi >= 0 && |
1904 | true_vifi != cache->mfc_parent && | |
1905 | ip_hdr(skb)->ttl > | |
1906 | cache->mfc_un.res.ttls[cache->mfc_parent]) { | |
1907 | /* It's an (*,*) entry and the packet is not coming from | |
1908 | * the upstream: forward the packet to the upstream | |
1909 | * only. | |
1910 | */ | |
1911 | psend = cache->mfc_parent; | |
1912 | goto last_forward; | |
1913 | } | |
1914 | goto dont_forward; | |
1915 | } | |
a8cb16dd ED |
1916 | for (ct = cache->mfc_un.res.maxvif - 1; |
1917 | ct >= cache->mfc_un.res.minvif; ct--) { | |
660b26dc | 1918 | /* For (*,G) entry, don't forward to the incoming interface */ |
360eb5da ND |
1919 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
1920 | ct != true_vifi) && | |
660b26dc | 1921 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1922 | if (psend != -1) { |
1923 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1924 | |
1da177e4 | 1925 | if (skb2) |
0c12295a PM |
1926 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1927 | psend); | |
1da177e4 | 1928 | } |
c354e124 | 1929 | psend = ct; |
1da177e4 LT |
1930 | } |
1931 | } | |
660b26dc | 1932 | last_forward: |
1da177e4 LT |
1933 | if (psend != -1) { |
1934 | if (local) { | |
1935 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1936 | |
1da177e4 | 1937 | if (skb2) |
0c12295a | 1938 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1939 | } else { |
0c12295a | 1940 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
c4854ec8 | 1941 | return; |
1da177e4 LT |
1942 | } |
1943 | } | |
1944 | ||
1945 | dont_forward: | |
1946 | if (!local) | |
1947 | kfree_skb(skb); | |
1da177e4 LT |
1948 | } |
1949 | ||
417da66f | 1950 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 1951 | { |
417da66f DM |
1952 | struct rtable *rt = skb_rtable(skb); |
1953 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 1954 | struct flowi4 fl4 = { |
417da66f DM |
1955 | .daddr = iph->daddr, |
1956 | .saddr = iph->saddr, | |
b0fe4a31 | 1957 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
1958 | .flowi4_oif = (rt_is_output_route(rt) ? |
1959 | skb->dev->ifindex : 0), | |
1960 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 1961 | LOOPBACK_IFINDEX : |
4fd551d7 | 1962 | skb->dev->ifindex), |
b4869889 | 1963 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
1964 | }; |
1965 | struct mr_table *mrt; | |
1966 | int err; | |
1967 | ||
da91981b | 1968 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
1969 | if (err) |
1970 | return ERR_PTR(err); | |
1971 | return mrt; | |
1972 | } | |
1da177e4 | 1973 | |
7ef8f65d NA |
1974 | /* Multicast packets for forwarding arrive here |
1975 | * Called with rcu_read_lock(); | |
1da177e4 | 1976 | */ |
1da177e4 LT |
1977 | int ip_mr_input(struct sk_buff *skb) |
1978 | { | |
1979 | struct mfc_cache *cache; | |
4feb88e5 | 1980 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1981 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 1982 | struct mr_table *mrt; |
bcfc7d33 TW |
1983 | struct net_device *dev; |
1984 | ||
1985 | /* skb->dev passed in is the loX master dev for vrfs. | |
1986 | * As there are no vifs associated with loopback devices, | |
1987 | * get the proper interface that does have a vif associated with it. | |
1988 | */ | |
1989 | dev = skb->dev; | |
1990 | if (netif_is_l3_master(skb->dev)) { | |
1991 | dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); | |
1992 | if (!dev) { | |
1993 | kfree_skb(skb); | |
1994 | return -ENODEV; | |
1995 | } | |
1996 | } | |
1da177e4 LT |
1997 | |
1998 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 1999 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 2000 | */ |
4c968709 | 2001 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
2002 | goto dont_forward; |
2003 | ||
417da66f | 2004 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2005 | if (IS_ERR(mrt)) { |
2006 | kfree_skb(skb); | |
2007 | return PTR_ERR(mrt); | |
e40dbc51 | 2008 | } |
1da177e4 | 2009 | if (!local) { |
4c968709 ED |
2010 | if (IPCB(skb)->opt.router_alert) { |
2011 | if (ip_call_ra_chain(skb)) | |
2012 | return 0; | |
2013 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
2014 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
2015 | * Cisco IOS <= 11.2(8)) do not put router alert | |
2016 | * option to IGMP packets destined to routable | |
2017 | * groups. It is very bad, because it means | |
2018 | * that we can forward NO IGMP messages. | |
2019 | */ | |
2020 | struct sock *mroute_sk; | |
2021 | ||
2022 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
2023 | if (mroute_sk) { | |
2024 | nf_reset(skb); | |
2025 | raw_rcv(mroute_sk, skb); | |
2026 | return 0; | |
2027 | } | |
1da177e4 LT |
2028 | } |
2029 | } | |
2030 | ||
a8c9486b | 2031 | /* already under rcu_read_lock() */ |
0c12295a | 2032 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
51456b29 | 2033 | if (!cache) { |
bcfc7d33 | 2034 | int vif = ipmr_find_vif(mrt, dev); |
660b26dc ND |
2035 | |
2036 | if (vif >= 0) | |
2037 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
2038 | vif); | |
2039 | } | |
1da177e4 | 2040 | |
7ef8f65d | 2041 | /* No usable cache entry */ |
51456b29 | 2042 | if (!cache) { |
1da177e4 LT |
2043 | int vif; |
2044 | ||
2045 | if (local) { | |
2046 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2047 | ip_local_deliver(skb); | |
51456b29 | 2048 | if (!skb2) |
1da177e4 | 2049 | return -ENOBUFS; |
1da177e4 LT |
2050 | skb = skb2; |
2051 | } | |
2052 | ||
a8c9486b | 2053 | read_lock(&mrt_lock); |
bcfc7d33 | 2054 | vif = ipmr_find_vif(mrt, dev); |
1da177e4 | 2055 | if (vif >= 0) { |
4b1f0d33 | 2056 | int err2 = ipmr_cache_unresolved(mrt, vif, skb, dev); |
1da177e4 LT |
2057 | read_unlock(&mrt_lock); |
2058 | ||
0eae88f3 | 2059 | return err2; |
1da177e4 LT |
2060 | } |
2061 | read_unlock(&mrt_lock); | |
2062 | kfree_skb(skb); | |
2063 | return -ENODEV; | |
2064 | } | |
2065 | ||
a8c9486b | 2066 | read_lock(&mrt_lock); |
4b1f0d33 | 2067 | ip_mr_forward(net, mrt, dev, skb, cache, local); |
1da177e4 LT |
2068 | read_unlock(&mrt_lock); |
2069 | ||
2070 | if (local) | |
2071 | return ip_local_deliver(skb); | |
2072 | ||
2073 | return 0; | |
2074 | ||
2075 | dont_forward: | |
2076 | if (local) | |
2077 | return ip_local_deliver(skb); | |
2078 | kfree_skb(skb); | |
2079 | return 0; | |
2080 | } | |
2081 | ||
b1879204 | 2082 | #ifdef CONFIG_IP_PIMSM_V1 |
7ef8f65d | 2083 | /* Handle IGMP messages of PIMv1 */ |
a8cb16dd | 2084 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2085 | { |
2086 | struct igmphdr *pim; | |
4feb88e5 | 2087 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2088 | struct mr_table *mrt; |
b1879204 IJ |
2089 | |
2090 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2091 | goto drop; | |
2092 | ||
2093 | pim = igmp_hdr(skb); | |
2094 | ||
417da66f | 2095 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2096 | if (IS_ERR(mrt)) |
2097 | goto drop; | |
0c12295a | 2098 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2099 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2100 | goto drop; | |
2101 | ||
f0ad0860 | 2102 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2103 | drop: |
2104 | kfree_skb(skb); | |
2105 | } | |
1da177e4 LT |
2106 | return 0; |
2107 | } | |
2108 | #endif | |
2109 | ||
2110 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2111 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2112 | { |
2113 | struct pimreghdr *pim; | |
f0ad0860 PM |
2114 | struct net *net = dev_net(skb->dev); |
2115 | struct mr_table *mrt; | |
1da177e4 | 2116 | |
b1879204 | 2117 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2118 | goto drop; |
2119 | ||
9c70220b | 2120 | pim = (struct pimreghdr *)skb_transport_header(skb); |
56245cae | 2121 | if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) || |
a8cb16dd | 2122 | (pim->flags & PIM_NULL_REGISTER) || |
e905a9ed | 2123 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2124 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2125 | goto drop; |
2126 | ||
417da66f | 2127 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2128 | if (IS_ERR(mrt)) |
2129 | goto drop; | |
f0ad0860 | 2130 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2131 | drop: |
2132 | kfree_skb(skb); | |
2133 | } | |
1da177e4 LT |
2134 | return 0; |
2135 | } | |
2136 | #endif | |
2137 | ||
cb6a4e46 PM |
2138 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2139 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 | 2140 | { |
adfa85e4 | 2141 | struct rta_mfc_stats mfcs; |
43b9e127 NA |
2142 | struct nlattr *mp_attr; |
2143 | struct rtnexthop *nhp; | |
b5036cd4 | 2144 | unsigned long lastuse; |
43b9e127 | 2145 | int ct; |
1da177e4 | 2146 | |
7438189b | 2147 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1708ebc9 NA |
2148 | if (c->mfc_parent >= MAXVIFS) { |
2149 | rtm->rtm_flags |= RTNH_F_UNRESOLVED; | |
7438189b | 2150 | return -ENOENT; |
1708ebc9 | 2151 | } |
7438189b | 2152 | |
92a395e5 TG |
2153 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
2154 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) | |
2155 | return -EMSGSIZE; | |
1da177e4 | 2156 | |
92a395e5 TG |
2157 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
2158 | return -EMSGSIZE; | |
1da177e4 LT |
2159 | |
2160 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 2161 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
92a395e5 TG |
2162 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
2163 | nla_nest_cancel(skb, mp_attr); | |
2164 | return -EMSGSIZE; | |
2165 | } | |
2166 | ||
1da177e4 LT |
2167 | nhp->rtnh_flags = 0; |
2168 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 2169 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
2170 | nhp->rtnh_len = sizeof(*nhp); |
2171 | } | |
2172 | } | |
92a395e5 TG |
2173 | |
2174 | nla_nest_end(skb, mp_attr); | |
2175 | ||
b5036cd4 NA |
2176 | lastuse = READ_ONCE(c->mfc_un.res.lastuse); |
2177 | lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0; | |
2178 | ||
adfa85e4 ND |
2179 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2180 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2181 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
43b9e127 | 2182 | if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) || |
b5036cd4 | 2183 | nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse), |
43b9e127 | 2184 | RTA_PAD)) |
adfa85e4 ND |
2185 | return -EMSGSIZE; |
2186 | ||
1da177e4 LT |
2187 | rtm->rtm_type = RTN_MULTICAST; |
2188 | return 1; | |
1da177e4 LT |
2189 | } |
2190 | ||
9a1b9496 DM |
2191 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2192 | __be32 saddr, __be32 daddr, | |
9f09eaea | 2193 | struct rtmsg *rtm, u32 portid) |
1da177e4 | 2194 | { |
1da177e4 | 2195 | struct mfc_cache *cache; |
9a1b9496 DM |
2196 | struct mr_table *mrt; |
2197 | int err; | |
1da177e4 | 2198 | |
f0ad0860 | 2199 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2200 | if (!mrt) |
f0ad0860 PM |
2201 | return -ENOENT; |
2202 | ||
a8c9486b | 2203 | rcu_read_lock(); |
9a1b9496 | 2204 | cache = ipmr_cache_find(mrt, saddr, daddr); |
51456b29 | 2205 | if (!cache && skb->dev) { |
660b26dc | 2206 | int vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2207 | |
660b26dc ND |
2208 | if (vif >= 0) |
2209 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2210 | } | |
51456b29 | 2211 | if (!cache) { |
72287490 | 2212 | struct sk_buff *skb2; |
eddc9ec5 | 2213 | struct iphdr *iph; |
1da177e4 | 2214 | struct net_device *dev; |
a8cb16dd | 2215 | int vif = -1; |
1da177e4 | 2216 | |
1da177e4 | 2217 | dev = skb->dev; |
a8c9486b | 2218 | read_lock(&mrt_lock); |
a8cb16dd ED |
2219 | if (dev) |
2220 | vif = ipmr_find_vif(mrt, dev); | |
2221 | if (vif < 0) { | |
1da177e4 | 2222 | read_unlock(&mrt_lock); |
a8c9486b | 2223 | rcu_read_unlock(); |
1da177e4 LT |
2224 | return -ENODEV; |
2225 | } | |
72287490 AK |
2226 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2227 | if (!skb2) { | |
2228 | read_unlock(&mrt_lock); | |
a8c9486b | 2229 | rcu_read_unlock(); |
72287490 AK |
2230 | return -ENOMEM; |
2231 | } | |
2232 | ||
2cf75070 | 2233 | NETLINK_CB(skb2).portid = portid; |
e2d1bca7 ACM |
2234 | skb_push(skb2, sizeof(struct iphdr)); |
2235 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2236 | iph = ip_hdr(skb2); |
2237 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2238 | iph->saddr = saddr; |
2239 | iph->daddr = daddr; | |
eddc9ec5 | 2240 | iph->version = 0; |
4b1f0d33 | 2241 | err = ipmr_cache_unresolved(mrt, vif, skb2, dev); |
1da177e4 | 2242 | read_unlock(&mrt_lock); |
a8c9486b | 2243 | rcu_read_unlock(); |
1da177e4 LT |
2244 | return err; |
2245 | } | |
2246 | ||
a8c9486b | 2247 | read_lock(&mrt_lock); |
cb6a4e46 | 2248 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2249 | read_unlock(&mrt_lock); |
a8c9486b | 2250 | rcu_read_unlock(); |
1da177e4 LT |
2251 | return err; |
2252 | } | |
2253 | ||
cb6a4e46 | 2254 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2255 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2256 | int flags) | |
cb6a4e46 PM |
2257 | { |
2258 | struct nlmsghdr *nlh; | |
2259 | struct rtmsg *rtm; | |
1eb99af5 | 2260 | int err; |
cb6a4e46 | 2261 | |
65886f43 | 2262 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
51456b29 | 2263 | if (!nlh) |
cb6a4e46 PM |
2264 | return -EMSGSIZE; |
2265 | ||
2266 | rtm = nlmsg_data(nlh); | |
2267 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2268 | rtm->rtm_dst_len = 32; | |
2269 | rtm->rtm_src_len = 32; | |
2270 | rtm->rtm_tos = 0; | |
2271 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2272 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2273 | goto nla_put_failure; | |
cb6a4e46 PM |
2274 | rtm->rtm_type = RTN_MULTICAST; |
2275 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
9a68ac72 ND |
2276 | if (c->mfc_flags & MFC_STATIC) |
2277 | rtm->rtm_protocol = RTPROT_STATIC; | |
2278 | else | |
2279 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2280 | rtm->rtm_flags = 0; |
2281 | ||
930345ea JB |
2282 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
2283 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) | |
f3756b79 | 2284 | goto nla_put_failure; |
1eb99af5 ND |
2285 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
2286 | /* do not break the dump if cache is unresolved */ | |
2287 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2288 | goto nla_put_failure; |
2289 | ||
053c095a JB |
2290 | nlmsg_end(skb, nlh); |
2291 | return 0; | |
cb6a4e46 PM |
2292 | |
2293 | nla_put_failure: | |
2294 | nlmsg_cancel(skb, nlh); | |
2295 | return -EMSGSIZE; | |
2296 | } | |
2297 | ||
8cd3ac9f ND |
2298 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2299 | { | |
2300 | size_t len = | |
2301 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2302 | + nla_total_size(4) /* RTA_TABLE */ | |
2303 | + nla_total_size(4) /* RTA_SRC */ | |
2304 | + nla_total_size(4) /* RTA_DST */ | |
2305 | ; | |
2306 | ||
2307 | if (!unresolved) | |
2308 | len = len | |
2309 | + nla_total_size(4) /* RTA_IIF */ | |
2310 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2311 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2312 | /* RTA_MFC_STATS */ | |
a9a08042 | 2313 | + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) |
8cd3ac9f ND |
2314 | ; |
2315 | ||
2316 | return len; | |
2317 | } | |
2318 | ||
2319 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2320 | int cmd) | |
2321 | { | |
2322 | struct net *net = read_pnet(&mrt->net); | |
2323 | struct sk_buff *skb; | |
2324 | int err = -ENOBUFS; | |
2325 | ||
2326 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), | |
2327 | GFP_ATOMIC); | |
51456b29 | 2328 | if (!skb) |
8cd3ac9f ND |
2329 | goto errout; |
2330 | ||
65886f43 | 2331 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2332 | if (err < 0) |
2333 | goto errout; | |
2334 | ||
2335 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2336 | return; | |
2337 | ||
2338 | errout: | |
2339 | kfree_skb(skb); | |
2340 | if (err < 0) | |
2341 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2342 | } | |
2343 | ||
cb6a4e46 PM |
2344 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2345 | { | |
2346 | struct net *net = sock_net(skb->sk); | |
2347 | struct mr_table *mrt; | |
2348 | struct mfc_cache *mfc; | |
2349 | unsigned int t = 0, s_t; | |
cb6a4e46 PM |
2350 | unsigned int e = 0, s_e; |
2351 | ||
2352 | s_t = cb->args[0]; | |
8fb472c0 | 2353 | s_e = cb->args[1]; |
cb6a4e46 | 2354 | |
a8c9486b | 2355 | rcu_read_lock(); |
cb6a4e46 PM |
2356 | ipmr_for_each_table(mrt, net) { |
2357 | if (t < s_t) | |
2358 | goto next_table; | |
8fb472c0 NA |
2359 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) { |
2360 | if (e < s_e) | |
2361 | goto next_entry; | |
2362 | if (ipmr_fill_mroute(mrt, skb, | |
2363 | NETLINK_CB(cb->skb).portid, | |
2364 | cb->nlh->nlmsg_seq, | |
2365 | mfc, RTM_NEWROUTE, | |
2366 | NLM_F_MULTI) < 0) | |
2367 | goto done; | |
cb6a4e46 | 2368 | next_entry: |
8fb472c0 | 2369 | e++; |
cb6a4e46 | 2370 | } |
8fb472c0 NA |
2371 | e = 0; |
2372 | s_e = 0; | |
2373 | ||
1eb99af5 ND |
2374 | spin_lock_bh(&mfc_unres_lock); |
2375 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { | |
2376 | if (e < s_e) | |
2377 | goto next_entry2; | |
2378 | if (ipmr_fill_mroute(mrt, skb, | |
2379 | NETLINK_CB(cb->skb).portid, | |
2380 | cb->nlh->nlmsg_seq, | |
65886f43 ND |
2381 | mfc, RTM_NEWROUTE, |
2382 | NLM_F_MULTI) < 0) { | |
1eb99af5 ND |
2383 | spin_unlock_bh(&mfc_unres_lock); |
2384 | goto done; | |
2385 | } | |
2386 | next_entry2: | |
2387 | e++; | |
2388 | } | |
2389 | spin_unlock_bh(&mfc_unres_lock); | |
8fb472c0 NA |
2390 | e = 0; |
2391 | s_e = 0; | |
cb6a4e46 PM |
2392 | next_table: |
2393 | t++; | |
2394 | } | |
2395 | done: | |
a8c9486b | 2396 | rcu_read_unlock(); |
cb6a4e46 | 2397 | |
8fb472c0 | 2398 | cb->args[1] = e; |
cb6a4e46 PM |
2399 | cb->args[0] = t; |
2400 | ||
2401 | return skb->len; | |
2402 | } | |
2403 | ||
ccbb0aa6 NA |
2404 | static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = { |
2405 | [RTA_SRC] = { .type = NLA_U32 }, | |
2406 | [RTA_DST] = { .type = NLA_U32 }, | |
2407 | [RTA_IIF] = { .type = NLA_U32 }, | |
2408 | [RTA_TABLE] = { .type = NLA_U32 }, | |
2409 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, | |
2410 | }; | |
2411 | ||
2412 | static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol) | |
2413 | { | |
2414 | switch (rtm_protocol) { | |
2415 | case RTPROT_STATIC: | |
2416 | case RTPROT_MROUTED: | |
2417 | return true; | |
2418 | } | |
2419 | return false; | |
2420 | } | |
2421 | ||
2422 | static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc) | |
2423 | { | |
2424 | struct rtnexthop *rtnh = nla_data(nla); | |
2425 | int remaining = nla_len(nla), vifi = 0; | |
2426 | ||
2427 | while (rtnh_ok(rtnh, remaining)) { | |
2428 | mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops; | |
2429 | if (++vifi == MAXVIFS) | |
2430 | break; | |
2431 | rtnh = rtnh_next(rtnh, &remaining); | |
2432 | } | |
2433 | ||
2434 | return remaining > 0 ? -EINVAL : vifi; | |
2435 | } | |
2436 | ||
2437 | /* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */ | |
2438 | static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh, | |
2439 | struct mfcctl *mfcc, int *mrtsock, | |
c21ef3e3 DA |
2440 | struct mr_table **mrtret, |
2441 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2442 | { |
2443 | struct net_device *dev = NULL; | |
2444 | u32 tblid = RT_TABLE_DEFAULT; | |
2445 | struct mr_table *mrt; | |
2446 | struct nlattr *attr; | |
2447 | struct rtmsg *rtm; | |
2448 | int ret, rem; | |
2449 | ||
fceb6435 | 2450 | ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy, |
c21ef3e3 | 2451 | extack); |
ccbb0aa6 NA |
2452 | if (ret < 0) |
2453 | goto out; | |
2454 | rtm = nlmsg_data(nlh); | |
2455 | ||
2456 | ret = -EINVAL; | |
2457 | if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 || | |
2458 | rtm->rtm_type != RTN_MULTICAST || | |
2459 | rtm->rtm_scope != RT_SCOPE_UNIVERSE || | |
2460 | !ipmr_rtm_validate_proto(rtm->rtm_protocol)) | |
2461 | goto out; | |
2462 | ||
2463 | memset(mfcc, 0, sizeof(*mfcc)); | |
2464 | mfcc->mfcc_parent = -1; | |
2465 | ret = 0; | |
2466 | nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) { | |
2467 | switch (nla_type(attr)) { | |
2468 | case RTA_SRC: | |
2469 | mfcc->mfcc_origin.s_addr = nla_get_be32(attr); | |
2470 | break; | |
2471 | case RTA_DST: | |
2472 | mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr); | |
2473 | break; | |
2474 | case RTA_IIF: | |
2475 | dev = __dev_get_by_index(net, nla_get_u32(attr)); | |
2476 | if (!dev) { | |
2477 | ret = -ENODEV; | |
2478 | goto out; | |
2479 | } | |
2480 | break; | |
2481 | case RTA_MULTIPATH: | |
2482 | if (ipmr_nla_get_ttls(attr, mfcc) < 0) { | |
2483 | ret = -EINVAL; | |
2484 | goto out; | |
2485 | } | |
2486 | break; | |
2487 | case RTA_PREFSRC: | |
2488 | ret = 1; | |
2489 | break; | |
2490 | case RTA_TABLE: | |
2491 | tblid = nla_get_u32(attr); | |
2492 | break; | |
2493 | } | |
2494 | } | |
2495 | mrt = ipmr_get_table(net, tblid); | |
2496 | if (!mrt) { | |
2497 | ret = -ENOENT; | |
2498 | goto out; | |
2499 | } | |
2500 | *mrtret = mrt; | |
2501 | *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0; | |
2502 | if (dev) | |
2503 | mfcc->mfcc_parent = ipmr_find_vif(mrt, dev); | |
2504 | ||
2505 | out: | |
2506 | return ret; | |
2507 | } | |
2508 | ||
2509 | /* takes care of both newroute and delroute */ | |
c21ef3e3 DA |
2510 | static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh, |
2511 | struct netlink_ext_ack *extack) | |
ccbb0aa6 NA |
2512 | { |
2513 | struct net *net = sock_net(skb->sk); | |
2514 | int ret, mrtsock, parent; | |
2515 | struct mr_table *tbl; | |
2516 | struct mfcctl mfcc; | |
2517 | ||
2518 | mrtsock = 0; | |
2519 | tbl = NULL; | |
c21ef3e3 | 2520 | ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl, extack); |
ccbb0aa6 NA |
2521 | if (ret < 0) |
2522 | return ret; | |
2523 | ||
2524 | parent = ret ? mfcc.mfcc_parent : -1; | |
2525 | if (nlh->nlmsg_type == RTM_NEWROUTE) | |
2526 | return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent); | |
2527 | else | |
2528 | return ipmr_mfc_delete(tbl, &mfcc, parent); | |
2529 | } | |
2530 | ||
772c344d NA |
2531 | static bool ipmr_fill_table(struct mr_table *mrt, struct sk_buff *skb) |
2532 | { | |
2533 | u32 queue_len = atomic_read(&mrt->cache_resolve_queue_len); | |
2534 | ||
2535 | if (nla_put_u32(skb, IPMRA_TABLE_ID, mrt->id) || | |
2536 | nla_put_u32(skb, IPMRA_TABLE_CACHE_RES_QUEUE_LEN, queue_len) || | |
2537 | nla_put_s32(skb, IPMRA_TABLE_MROUTE_REG_VIF_NUM, | |
2538 | mrt->mroute_reg_vif_num) || | |
2539 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_ASSERT, | |
2540 | mrt->mroute_do_assert) || | |
2541 | nla_put_u8(skb, IPMRA_TABLE_MROUTE_DO_PIM, mrt->mroute_do_pim)) | |
2542 | return false; | |
2543 | ||
2544 | return true; | |
2545 | } | |
2546 | ||
2547 | static bool ipmr_fill_vif(struct mr_table *mrt, u32 vifid, struct sk_buff *skb) | |
2548 | { | |
2549 | struct nlattr *vif_nest; | |
2550 | struct vif_device *vif; | |
2551 | ||
2552 | /* if the VIF doesn't exist just continue */ | |
2553 | if (!VIF_EXISTS(mrt, vifid)) | |
2554 | return true; | |
2555 | ||
2556 | vif = &mrt->vif_table[vifid]; | |
2557 | vif_nest = nla_nest_start(skb, IPMRA_VIF); | |
2558 | if (!vif_nest) | |
2559 | return false; | |
2560 | if (nla_put_u32(skb, IPMRA_VIFA_IFINDEX, vif->dev->ifindex) || | |
2561 | nla_put_u32(skb, IPMRA_VIFA_VIF_ID, vifid) || | |
2562 | nla_put_u16(skb, IPMRA_VIFA_FLAGS, vif->flags) || | |
2563 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_IN, vif->bytes_in, | |
2564 | IPMRA_VIFA_PAD) || | |
2565 | nla_put_u64_64bit(skb, IPMRA_VIFA_BYTES_OUT, vif->bytes_out, | |
2566 | IPMRA_VIFA_PAD) || | |
2567 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_IN, vif->pkt_in, | |
2568 | IPMRA_VIFA_PAD) || | |
2569 | nla_put_u64_64bit(skb, IPMRA_VIFA_PACKETS_OUT, vif->pkt_out, | |
2570 | IPMRA_VIFA_PAD) || | |
2571 | nla_put_be32(skb, IPMRA_VIFA_LOCAL_ADDR, vif->local) || | |
2572 | nla_put_be32(skb, IPMRA_VIFA_REMOTE_ADDR, vif->remote)) { | |
2573 | nla_nest_cancel(skb, vif_nest); | |
2574 | return false; | |
2575 | } | |
2576 | nla_nest_end(skb, vif_nest); | |
2577 | ||
2578 | return true; | |
2579 | } | |
2580 | ||
2581 | static int ipmr_rtm_dumplink(struct sk_buff *skb, struct netlink_callback *cb) | |
2582 | { | |
2583 | struct net *net = sock_net(skb->sk); | |
2584 | struct nlmsghdr *nlh = NULL; | |
2585 | unsigned int t = 0, s_t; | |
2586 | unsigned int e = 0, s_e; | |
2587 | struct mr_table *mrt; | |
2588 | ||
2589 | s_t = cb->args[0]; | |
2590 | s_e = cb->args[1]; | |
2591 | ||
2592 | ipmr_for_each_table(mrt, net) { | |
2593 | struct nlattr *vifs, *af; | |
2594 | struct ifinfomsg *hdr; | |
2595 | u32 i; | |
2596 | ||
2597 | if (t < s_t) | |
2598 | goto skip_table; | |
2599 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
2600 | cb->nlh->nlmsg_seq, RTM_NEWLINK, | |
2601 | sizeof(*hdr), NLM_F_MULTI); | |
2602 | if (!nlh) | |
2603 | break; | |
2604 | ||
2605 | hdr = nlmsg_data(nlh); | |
2606 | memset(hdr, 0, sizeof(*hdr)); | |
2607 | hdr->ifi_family = RTNL_FAMILY_IPMR; | |
2608 | ||
2609 | af = nla_nest_start(skb, IFLA_AF_SPEC); | |
2610 | if (!af) { | |
2611 | nlmsg_cancel(skb, nlh); | |
2612 | goto out; | |
2613 | } | |
2614 | ||
2615 | if (!ipmr_fill_table(mrt, skb)) { | |
2616 | nlmsg_cancel(skb, nlh); | |
2617 | goto out; | |
2618 | } | |
2619 | ||
2620 | vifs = nla_nest_start(skb, IPMRA_TABLE_VIFS); | |
2621 | if (!vifs) { | |
2622 | nla_nest_end(skb, af); | |
2623 | nlmsg_end(skb, nlh); | |
2624 | goto out; | |
2625 | } | |
2626 | for (i = 0; i < mrt->maxvif; i++) { | |
2627 | if (e < s_e) | |
2628 | goto skip_entry; | |
2629 | if (!ipmr_fill_vif(mrt, i, skb)) { | |
2630 | nla_nest_end(skb, vifs); | |
2631 | nla_nest_end(skb, af); | |
2632 | nlmsg_end(skb, nlh); | |
2633 | goto out; | |
2634 | } | |
2635 | skip_entry: | |
2636 | e++; | |
2637 | } | |
2638 | s_e = 0; | |
2639 | e = 0; | |
2640 | nla_nest_end(skb, vifs); | |
2641 | nla_nest_end(skb, af); | |
2642 | nlmsg_end(skb, nlh); | |
2643 | skip_table: | |
2644 | t++; | |
2645 | } | |
2646 | ||
2647 | out: | |
2648 | cb->args[1] = e; | |
2649 | cb->args[0] = t; | |
2650 | ||
2651 | return skb->len; | |
2652 | } | |
2653 | ||
e905a9ed | 2654 | #ifdef CONFIG_PROC_FS |
7ef8f65d NA |
2655 | /* The /proc interfaces to multicast routing : |
2656 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 LT |
2657 | */ |
2658 | struct ipmr_vif_iter { | |
f6bb4514 | 2659 | struct seq_net_private p; |
f0ad0860 | 2660 | struct mr_table *mrt; |
1da177e4 LT |
2661 | int ct; |
2662 | }; | |
2663 | ||
f6bb4514 BT |
2664 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2665 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2666 | loff_t pos) |
2667 | { | |
f0ad0860 | 2668 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2669 | |
2670 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2671 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2672 | continue; |
e905a9ed | 2673 | if (pos-- == 0) |
0c12295a | 2674 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2675 | } |
2676 | return NULL; | |
2677 | } | |
2678 | ||
2679 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2680 | __acquires(mrt_lock) |
1da177e4 | 2681 | { |
f0ad0860 | 2682 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2683 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2684 | struct mr_table *mrt; |
2685 | ||
2686 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 2687 | if (!mrt) |
f0ad0860 PM |
2688 | return ERR_PTR(-ENOENT); |
2689 | ||
2690 | iter->mrt = mrt; | |
f6bb4514 | 2691 | |
1da177e4 | 2692 | read_lock(&mrt_lock); |
f6bb4514 | 2693 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2694 | : SEQ_START_TOKEN; |
2695 | } | |
2696 | ||
2697 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2698 | { | |
2699 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2700 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2701 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2702 | |
2703 | ++*pos; | |
2704 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2705 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2706 | |
0c12295a PM |
2707 | while (++iter->ct < mrt->maxvif) { |
2708 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2709 | continue; |
0c12295a | 2710 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2711 | } |
2712 | return NULL; | |
2713 | } | |
2714 | ||
2715 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2716 | __releases(mrt_lock) |
1da177e4 LT |
2717 | { |
2718 | read_unlock(&mrt_lock); | |
2719 | } | |
2720 | ||
2721 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2722 | { | |
f0ad0860 PM |
2723 | struct ipmr_vif_iter *iter = seq->private; |
2724 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2725 | |
1da177e4 | 2726 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2727 | seq_puts(seq, |
1da177e4 LT |
2728 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2729 | } else { | |
2730 | const struct vif_device *vif = v; | |
2731 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2732 | ||
2733 | seq_printf(seq, | |
5b5e0928 | 2734 | "%2zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", |
0c12295a | 2735 | vif - mrt->vif_table, |
e905a9ed | 2736 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2737 | vif->bytes_out, vif->pkt_out, |
2738 | vif->flags, vif->local, vif->remote); | |
2739 | } | |
2740 | return 0; | |
2741 | } | |
2742 | ||
f690808e | 2743 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2744 | .start = ipmr_vif_seq_start, |
2745 | .next = ipmr_vif_seq_next, | |
2746 | .stop = ipmr_vif_seq_stop, | |
2747 | .show = ipmr_vif_seq_show, | |
2748 | }; | |
2749 | ||
2750 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2751 | { | |
f6bb4514 BT |
2752 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2753 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2754 | } |
2755 | ||
9a32144e | 2756 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2757 | .owner = THIS_MODULE, |
2758 | .open = ipmr_vif_open, | |
2759 | .read = seq_read, | |
2760 | .llseek = seq_lseek, | |
f6bb4514 | 2761 | .release = seq_release_net, |
1da177e4 LT |
2762 | }; |
2763 | ||
2764 | struct ipmr_mfc_iter { | |
f6bb4514 | 2765 | struct seq_net_private p; |
f0ad0860 | 2766 | struct mr_table *mrt; |
862465f2 | 2767 | struct list_head *cache; |
1da177e4 LT |
2768 | }; |
2769 | ||
f6bb4514 BT |
2770 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2771 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2772 | { |
f0ad0860 | 2773 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2774 | struct mfc_cache *mfc; |
2775 | ||
a8c9486b | 2776 | rcu_read_lock(); |
8fb472c0 NA |
2777 | it->cache = &mrt->mfc_cache_list; |
2778 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) | |
2779 | if (pos-- == 0) | |
2780 | return mfc; | |
a8c9486b | 2781 | rcu_read_unlock(); |
1da177e4 | 2782 | |
1da177e4 | 2783 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2784 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2785 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2786 | if (pos-- == 0) |
1da177e4 LT |
2787 | return mfc; |
2788 | spin_unlock_bh(&mfc_unres_lock); | |
2789 | ||
2790 | it->cache = NULL; | |
2791 | return NULL; | |
2792 | } | |
2793 | ||
2794 | ||
2795 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2796 | { | |
2797 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2798 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2799 | struct mr_table *mrt; |
f6bb4514 | 2800 | |
f0ad0860 | 2801 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2802 | if (!mrt) |
f0ad0860 | 2803 | return ERR_PTR(-ENOENT); |
f6bb4514 | 2804 | |
f0ad0860 | 2805 | it->mrt = mrt; |
1da177e4 | 2806 | it->cache = NULL; |
f6bb4514 | 2807 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2808 | : SEQ_START_TOKEN; |
2809 | } | |
2810 | ||
2811 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2812 | { | |
1da177e4 | 2813 | struct ipmr_mfc_iter *it = seq->private; |
f6bb4514 | 2814 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2815 | struct mr_table *mrt = it->mrt; |
8fb472c0 | 2816 | struct mfc_cache *mfc = v; |
1da177e4 LT |
2817 | |
2818 | ++*pos; | |
2819 | ||
2820 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2821 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2822 | |
862465f2 PM |
2823 | if (mfc->list.next != it->cache) |
2824 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2825 | |
0c12295a | 2826 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2827 | goto end_of_list; |
2828 | ||
1da177e4 | 2829 | /* exhausted cache_array, show unresolved */ |
a8c9486b | 2830 | rcu_read_unlock(); |
0c12295a | 2831 | it->cache = &mrt->mfc_unres_queue; |
e905a9ed | 2832 | |
1da177e4 | 2833 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2834 | if (!list_empty(it->cache)) |
2835 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 | 2836 | |
a8cb16dd | 2837 | end_of_list: |
1da177e4 LT |
2838 | spin_unlock_bh(&mfc_unres_lock); |
2839 | it->cache = NULL; | |
2840 | ||
2841 | return NULL; | |
2842 | } | |
2843 | ||
2844 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2845 | { | |
2846 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2847 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2848 | |
0c12295a | 2849 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2850 | spin_unlock_bh(&mfc_unres_lock); |
8fb472c0 | 2851 | else if (it->cache == &mrt->mfc_cache_list) |
a8c9486b | 2852 | rcu_read_unlock(); |
1da177e4 LT |
2853 | } |
2854 | ||
2855 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2856 | { | |
2857 | int n; | |
2858 | ||
2859 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2860 | seq_puts(seq, |
1da177e4 LT |
2861 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2862 | } else { | |
2863 | const struct mfc_cache *mfc = v; | |
2864 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2865 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2866 | |
0eae88f3 ED |
2867 | seq_printf(seq, "%08X %08X %-3hd", |
2868 | (__force u32) mfc->mfc_mcastgrp, | |
2869 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2870 | mfc->mfc_parent); |
1da177e4 | 2871 | |
0c12295a | 2872 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2873 | seq_printf(seq, " %8lu %8lu %8lu", |
2874 | mfc->mfc_un.res.pkt, | |
2875 | mfc->mfc_un.res.bytes, | |
2876 | mfc->mfc_un.res.wrong_if); | |
132adf54 | 2877 | for (n = mfc->mfc_un.res.minvif; |
a8cb16dd | 2878 | n < mfc->mfc_un.res.maxvif; n++) { |
0c12295a | 2879 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2880 | mfc->mfc_un.res.ttls[n] < 255) |
2881 | seq_printf(seq, | |
e905a9ed | 2882 | " %2d:%-3d", |
1da177e4 LT |
2883 | n, mfc->mfc_un.res.ttls[n]); |
2884 | } | |
1ea472e2 BT |
2885 | } else { |
2886 | /* unresolved mfc_caches don't contain | |
2887 | * pkt, bytes and wrong_if values | |
2888 | */ | |
2889 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2890 | } |
2891 | seq_putc(seq, '\n'); | |
2892 | } | |
2893 | return 0; | |
2894 | } | |
2895 | ||
f690808e | 2896 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2897 | .start = ipmr_mfc_seq_start, |
2898 | .next = ipmr_mfc_seq_next, | |
2899 | .stop = ipmr_mfc_seq_stop, | |
2900 | .show = ipmr_mfc_seq_show, | |
2901 | }; | |
2902 | ||
2903 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2904 | { | |
f6bb4514 BT |
2905 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2906 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2907 | } |
2908 | ||
9a32144e | 2909 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2910 | .owner = THIS_MODULE, |
2911 | .open = ipmr_mfc_open, | |
2912 | .read = seq_read, | |
2913 | .llseek = seq_lseek, | |
f6bb4514 | 2914 | .release = seq_release_net, |
1da177e4 | 2915 | }; |
e905a9ed | 2916 | #endif |
1da177e4 LT |
2917 | |
2918 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2919 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2920 | .handler = pim_rcv, |
403dbb97 | 2921 | .netns_ok = 1, |
1da177e4 LT |
2922 | }; |
2923 | #endif | |
2924 | ||
7ef8f65d | 2925 | /* Setup for IP multicast routing */ |
cf958ae3 BT |
2926 | static int __net_init ipmr_net_init(struct net *net) |
2927 | { | |
f0ad0860 | 2928 | int err; |
cf958ae3 | 2929 | |
f0ad0860 PM |
2930 | err = ipmr_rules_init(net); |
2931 | if (err < 0) | |
cf958ae3 | 2932 | goto fail; |
f6bb4514 BT |
2933 | |
2934 | #ifdef CONFIG_PROC_FS | |
2935 | err = -ENOMEM; | |
d4beaa66 | 2936 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 2937 | goto proc_vif_fail; |
d4beaa66 | 2938 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
2939 | goto proc_cache_fail; |
2940 | #endif | |
2bb8b26c BT |
2941 | return 0; |
2942 | ||
f6bb4514 BT |
2943 | #ifdef CONFIG_PROC_FS |
2944 | proc_cache_fail: | |
ece31ffd | 2945 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 2946 | proc_vif_fail: |
f0ad0860 | 2947 | ipmr_rules_exit(net); |
f6bb4514 | 2948 | #endif |
cf958ae3 BT |
2949 | fail: |
2950 | return err; | |
2951 | } | |
2952 | ||
2953 | static void __net_exit ipmr_net_exit(struct net *net) | |
2954 | { | |
f6bb4514 | 2955 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
2956 | remove_proc_entry("ip_mr_cache", net->proc_net); |
2957 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 2958 | #endif |
f0ad0860 | 2959 | ipmr_rules_exit(net); |
cf958ae3 BT |
2960 | } |
2961 | ||
2962 | static struct pernet_operations ipmr_net_ops = { | |
2963 | .init = ipmr_net_init, | |
2964 | .exit = ipmr_net_exit, | |
2965 | }; | |
e905a9ed | 2966 | |
03d2f897 | 2967 | int __init ip_mr_init(void) |
1da177e4 | 2968 | { |
03d2f897 WC |
2969 | int err; |
2970 | ||
1da177e4 LT |
2971 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2972 | sizeof(struct mfc_cache), | |
a8c9486b | 2973 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 2974 | NULL); |
03d2f897 | 2975 | |
cf958ae3 BT |
2976 | err = register_pernet_subsys(&ipmr_net_ops); |
2977 | if (err) | |
2978 | goto reg_pernet_fail; | |
2979 | ||
03d2f897 WC |
2980 | err = register_netdevice_notifier(&ip_mr_notifier); |
2981 | if (err) | |
2982 | goto reg_notif_fail; | |
403dbb97 TG |
2983 | #ifdef CONFIG_IP_PIMSM_V2 |
2984 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 2985 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
2986 | err = -EAGAIN; |
2987 | goto add_proto_fail; | |
2988 | } | |
2989 | #endif | |
c7ac8679 GR |
2990 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
2991 | NULL, ipmr_rtm_dumproute, NULL); | |
ccbb0aa6 NA |
2992 | rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, |
2993 | ipmr_rtm_route, NULL, NULL); | |
2994 | rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, | |
2995 | ipmr_rtm_route, NULL, NULL); | |
772c344d NA |
2996 | |
2997 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETLINK, | |
2998 | NULL, ipmr_rtm_dumplink, NULL); | |
03d2f897 | 2999 | return 0; |
f6bb4514 | 3000 | |
403dbb97 TG |
3001 | #ifdef CONFIG_IP_PIMSM_V2 |
3002 | add_proto_fail: | |
3003 | unregister_netdevice_notifier(&ip_mr_notifier); | |
3004 | #endif | |
c3e38896 | 3005 | reg_notif_fail: |
cf958ae3 BT |
3006 | unregister_pernet_subsys(&ipmr_net_ops); |
3007 | reg_pernet_fail: | |
c3e38896 | 3008 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 3009 | return err; |
1da177e4 | 3010 | } |