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