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 | ||
1da177e4 LT |
29 | #include <asm/uaccess.h> |
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> |
1da177e4 LT |
69 | |
70 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
71 | #define CONFIG_IP_PIMSM 1 | |
72 | #endif | |
73 | ||
0c12295a | 74 | struct mr_table { |
f0ad0860 | 75 | struct list_head list; |
0c5c9fb5 | 76 | possible_net_t net; |
f0ad0860 | 77 | u32 id; |
4c968709 | 78 | struct sock __rcu *mroute_sk; |
0c12295a PM |
79 | struct timer_list ipmr_expire_timer; |
80 | struct list_head mfc_unres_queue; | |
81 | struct list_head mfc_cache_array[MFC_LINES]; | |
82 | struct vif_device vif_table[MAXVIFS]; | |
83 | int maxvif; | |
84 | atomic_t cache_resolve_queue_len; | |
53d6841d JP |
85 | bool mroute_do_assert; |
86 | bool mroute_do_pim; | |
0c12295a PM |
87 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
88 | int mroute_reg_vif_num; | |
89 | #endif | |
90 | }; | |
91 | ||
f0ad0860 PM |
92 | struct ipmr_rule { |
93 | struct fib_rule common; | |
94 | }; | |
95 | ||
96 | struct ipmr_result { | |
97 | struct mr_table *mrt; | |
98 | }; | |
99 | ||
1da177e4 | 100 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 101 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
102 | */ |
103 | ||
104 | static DEFINE_RWLOCK(mrt_lock); | |
105 | ||
106 | /* | |
107 | * Multicast router control variables | |
108 | */ | |
109 | ||
0c12295a | 110 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 LT |
111 | |
112 | /* Special spinlock for queue of unresolved entries */ | |
113 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
114 | ||
115 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
116 | * entries is changed only in process context and protected |
117 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
118 | * with strong spinlock mfc_unres_lock. | |
119 | * | |
120 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
121 | */ |
122 | ||
e18b890b | 123 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 124 | |
f0ad0860 | 125 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
126 | static void ipmr_free_table(struct mr_table *mrt); |
127 | ||
c4854ec8 RR |
128 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
129 | struct sk_buff *skb, struct mfc_cache *cache, | |
130 | int local); | |
0c12295a | 131 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 132 | struct sk_buff *pkt, vifi_t vifi, int assert); |
cb6a4e46 PM |
133 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
134 | struct mfc_cache *c, struct rtmsg *rtm); | |
8cd3ac9f ND |
135 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
136 | int cmd); | |
acbb219d | 137 | static void mroute_clean_tables(struct mr_table *mrt); |
f0ad0860 PM |
138 | static void ipmr_expire_process(unsigned long arg); |
139 | ||
140 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
141 | #define ipmr_for_each_table(mrt, net) \ | |
142 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
143 | ||
144 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
145 | { | |
146 | struct mr_table *mrt; | |
147 | ||
148 | ipmr_for_each_table(mrt, net) { | |
149 | if (mrt->id == id) | |
150 | return mrt; | |
151 | } | |
152 | return NULL; | |
153 | } | |
154 | ||
da91981b | 155 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
156 | struct mr_table **mrt) |
157 | { | |
f0ad0860 | 158 | int err; |
95f4a45d HFS |
159 | struct ipmr_result res; |
160 | struct fib_lookup_arg arg = { | |
161 | .result = &res, | |
162 | .flags = FIB_LOOKUP_NOREF, | |
163 | }; | |
f0ad0860 | 164 | |
da91981b DM |
165 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
166 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
167 | if (err < 0) |
168 | return err; | |
169 | *mrt = res.mrt; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
174 | int flags, struct fib_lookup_arg *arg) | |
175 | { | |
176 | struct ipmr_result *res = arg->result; | |
177 | struct mr_table *mrt; | |
1da177e4 | 178 | |
f0ad0860 PM |
179 | switch (rule->action) { |
180 | case FR_ACT_TO_TBL: | |
181 | break; | |
182 | case FR_ACT_UNREACHABLE: | |
183 | return -ENETUNREACH; | |
184 | case FR_ACT_PROHIBIT: | |
185 | return -EACCES; | |
186 | case FR_ACT_BLACKHOLE: | |
187 | default: | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
51456b29 | 192 | if (!mrt) |
f0ad0860 PM |
193 | return -EAGAIN; |
194 | res->mrt = mrt; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
199 | { | |
200 | return 1; | |
201 | } | |
202 | ||
203 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
204 | FRA_GENERIC_POLICY, | |
205 | }; | |
206 | ||
207 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
208 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
214 | struct nlattr **tb) | |
215 | { | |
216 | return 1; | |
217 | } | |
218 | ||
219 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
220 | struct fib_rule_hdr *frh) | |
221 | { | |
222 | frh->dst_len = 0; | |
223 | frh->src_len = 0; | |
224 | frh->tos = 0; | |
225 | return 0; | |
226 | } | |
227 | ||
04a6f82c | 228 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 229 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
230 | .rule_size = sizeof(struct ipmr_rule), |
231 | .addr_size = sizeof(u32), | |
232 | .action = ipmr_rule_action, | |
233 | .match = ipmr_rule_match, | |
234 | .configure = ipmr_rule_configure, | |
235 | .compare = ipmr_rule_compare, | |
f0ad0860 PM |
236 | .fill = ipmr_rule_fill, |
237 | .nlgroup = RTNLGRP_IPV4_RULE, | |
238 | .policy = ipmr_rule_policy, | |
239 | .owner = THIS_MODULE, | |
240 | }; | |
241 | ||
242 | static int __net_init ipmr_rules_init(struct net *net) | |
243 | { | |
244 | struct fib_rules_ops *ops; | |
245 | struct mr_table *mrt; | |
246 | int err; | |
247 | ||
248 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
249 | if (IS_ERR(ops)) | |
250 | return PTR_ERR(ops); | |
251 | ||
252 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
253 | ||
254 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 255 | if (!mrt) { |
f0ad0860 PM |
256 | err = -ENOMEM; |
257 | goto err1; | |
258 | } | |
259 | ||
260 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
261 | if (err < 0) | |
262 | goto err2; | |
263 | ||
264 | net->ipv4.mr_rules_ops = ops; | |
265 | return 0; | |
266 | ||
267 | err2: | |
f243e5a7 | 268 | ipmr_free_table(mrt); |
f0ad0860 PM |
269 | err1: |
270 | fib_rules_unregister(ops); | |
271 | return err; | |
272 | } | |
273 | ||
274 | static void __net_exit ipmr_rules_exit(struct net *net) | |
275 | { | |
276 | struct mr_table *mrt, *next; | |
277 | ||
ed785309 | 278 | rtnl_lock(); |
035320d5 ED |
279 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
280 | list_del(&mrt->list); | |
acbb219d | 281 | ipmr_free_table(mrt); |
035320d5 | 282 | } |
f0ad0860 | 283 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
419df12f | 284 | rtnl_unlock(); |
f0ad0860 PM |
285 | } |
286 | #else | |
287 | #define ipmr_for_each_table(mrt, net) \ | |
288 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
289 | ||
290 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
291 | { | |
292 | return net->ipv4.mrt; | |
293 | } | |
294 | ||
da91981b | 295 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
296 | struct mr_table **mrt) |
297 | { | |
298 | *mrt = net->ipv4.mrt; | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int __net_init ipmr_rules_init(struct net *net) | |
303 | { | |
304 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
305 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
306 | } | |
307 | ||
308 | static void __net_exit ipmr_rules_exit(struct net *net) | |
309 | { | |
ed785309 | 310 | rtnl_lock(); |
acbb219d | 311 | ipmr_free_table(net->ipv4.mrt); |
ed785309 WC |
312 | net->ipv4.mrt = NULL; |
313 | rtnl_unlock(); | |
f0ad0860 PM |
314 | } |
315 | #endif | |
316 | ||
317 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
318 | { | |
319 | struct mr_table *mrt; | |
320 | unsigned int i; | |
1da177e4 | 321 | |
f0ad0860 | 322 | mrt = ipmr_get_table(net, id); |
00db4124 | 323 | if (mrt) |
f0ad0860 PM |
324 | return mrt; |
325 | ||
326 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
51456b29 | 327 | if (!mrt) |
f0ad0860 | 328 | return NULL; |
8de53dfb | 329 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
330 | mrt->id = id; |
331 | ||
332 | /* Forwarding cache */ | |
333 | for (i = 0; i < MFC_LINES; i++) | |
334 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
335 | ||
336 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
337 | ||
338 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
339 | (unsigned long)mrt); | |
340 | ||
341 | #ifdef CONFIG_IP_PIMSM | |
342 | mrt->mroute_reg_vif_num = -1; | |
343 | #endif | |
344 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
345 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
346 | #endif | |
347 | return mrt; | |
348 | } | |
1da177e4 | 349 | |
acbb219d FR |
350 | static void ipmr_free_table(struct mr_table *mrt) |
351 | { | |
352 | del_timer_sync(&mrt->ipmr_expire_timer); | |
353 | mroute_clean_tables(mrt); | |
354 | kfree(mrt); | |
355 | } | |
356 | ||
1da177e4 LT |
357 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
358 | ||
d607032d WC |
359 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
360 | { | |
4feb88e5 BT |
361 | struct net *net = dev_net(dev); |
362 | ||
d607032d WC |
363 | dev_close(dev); |
364 | ||
4feb88e5 | 365 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 366 | if (dev) { |
5bc3eb7e | 367 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 368 | struct ifreq ifr; |
d607032d WC |
369 | struct ip_tunnel_parm p; |
370 | ||
371 | memset(&p, 0, sizeof(p)); | |
372 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
373 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
374 | p.iph.version = 4; | |
375 | p.iph.ihl = 5; | |
376 | p.iph.protocol = IPPROTO_IPIP; | |
377 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
378 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
379 | ||
5bc3eb7e SH |
380 | if (ops->ndo_do_ioctl) { |
381 | mm_segment_t oldfs = get_fs(); | |
382 | ||
383 | set_fs(KERNEL_DS); | |
384 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
385 | set_fs(oldfs); | |
386 | } | |
d607032d WC |
387 | } |
388 | } | |
389 | ||
1da177e4 | 390 | static |
4feb88e5 | 391 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
392 | { |
393 | struct net_device *dev; | |
394 | ||
4feb88e5 | 395 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
396 | |
397 | if (dev) { | |
5bc3eb7e | 398 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
399 | int err; |
400 | struct ifreq ifr; | |
1da177e4 LT |
401 | struct ip_tunnel_parm p; |
402 | struct in_device *in_dev; | |
403 | ||
404 | memset(&p, 0, sizeof(p)); | |
405 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
406 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
407 | p.iph.version = 4; | |
408 | p.iph.ihl = 5; | |
409 | p.iph.protocol = IPPROTO_IPIP; | |
410 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 411 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 412 | |
5bc3eb7e SH |
413 | if (ops->ndo_do_ioctl) { |
414 | mm_segment_t oldfs = get_fs(); | |
415 | ||
416 | set_fs(KERNEL_DS); | |
417 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
418 | set_fs(oldfs); | |
a8cb16dd | 419 | } else { |
5bc3eb7e | 420 | err = -EOPNOTSUPP; |
a8cb16dd | 421 | } |
1da177e4 LT |
422 | dev = NULL; |
423 | ||
4feb88e5 BT |
424 | if (err == 0 && |
425 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
426 | dev->flags |= IFF_MULTICAST; |
427 | ||
e5ed6399 | 428 | in_dev = __in_dev_get_rtnl(dev); |
51456b29 | 429 | if (!in_dev) |
1da177e4 | 430 | goto failure; |
71e27da9 HX |
431 | |
432 | ipv4_devconf_setall(in_dev); | |
1d4c8c29 | 433 | neigh_parms_data_state_setall(in_dev->arp_parms); |
71e27da9 | 434 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
1da177e4 LT |
435 | |
436 | if (dev_open(dev)) | |
437 | goto failure; | |
7dc00c82 | 438 | dev_hold(dev); |
1da177e4 LT |
439 | } |
440 | } | |
441 | return dev; | |
442 | ||
443 | failure: | |
444 | /* allow the register to be completed before unregistering. */ | |
445 | rtnl_unlock(); | |
446 | rtnl_lock(); | |
447 | ||
448 | unregister_netdevice(dev); | |
449 | return NULL; | |
450 | } | |
451 | ||
452 | #ifdef CONFIG_IP_PIMSM | |
453 | ||
6fef4c0c | 454 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 455 | { |
4feb88e5 | 456 | struct net *net = dev_net(dev); |
f0ad0860 | 457 | struct mr_table *mrt; |
da91981b DM |
458 | struct flowi4 fl4 = { |
459 | .flowi4_oif = dev->ifindex, | |
6a662719 | 460 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
da91981b | 461 | .flowi4_mark = skb->mark, |
f0ad0860 PM |
462 | }; |
463 | int err; | |
464 | ||
da91981b | 465 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
466 | if (err < 0) { |
467 | kfree_skb(skb); | |
f0ad0860 | 468 | return err; |
e40dbc51 | 469 | } |
4feb88e5 | 470 | |
1da177e4 | 471 | read_lock(&mrt_lock); |
cf3677ae PE |
472 | dev->stats.tx_bytes += skb->len; |
473 | dev->stats.tx_packets++; | |
0c12295a | 474 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
475 | read_unlock(&mrt_lock); |
476 | kfree_skb(skb); | |
6ed10654 | 477 | return NETDEV_TX_OK; |
1da177e4 LT |
478 | } |
479 | ||
ee9b9596 ND |
480 | static int reg_vif_get_iflink(const struct net_device *dev) |
481 | { | |
482 | return 0; | |
483 | } | |
484 | ||
007c3838 SH |
485 | static const struct net_device_ops reg_vif_netdev_ops = { |
486 | .ndo_start_xmit = reg_vif_xmit, | |
ee9b9596 | 487 | .ndo_get_iflink = reg_vif_get_iflink, |
007c3838 SH |
488 | }; |
489 | ||
1da177e4 LT |
490 | static void reg_vif_setup(struct net_device *dev) |
491 | { | |
492 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 493 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 494 | dev->flags = IFF_NOARP; |
70cb4a45 | 495 | dev->netdev_ops = ®_vif_netdev_ops; |
1da177e4 | 496 | dev->destructor = free_netdev; |
403dbb97 | 497 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
498 | } |
499 | ||
f0ad0860 | 500 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
501 | { |
502 | struct net_device *dev; | |
503 | struct in_device *in_dev; | |
f0ad0860 | 504 | char name[IFNAMSIZ]; |
1da177e4 | 505 | |
f0ad0860 PM |
506 | if (mrt->id == RT_TABLE_DEFAULT) |
507 | sprintf(name, "pimreg"); | |
508 | else | |
509 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 510 | |
c835a677 | 511 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
1da177e4 | 512 | |
51456b29 | 513 | if (!dev) |
1da177e4 LT |
514 | return NULL; |
515 | ||
403dbb97 TG |
516 | dev_net_set(dev, net); |
517 | ||
1da177e4 LT |
518 | if (register_netdevice(dev)) { |
519 | free_netdev(dev); | |
520 | return NULL; | |
521 | } | |
1da177e4 | 522 | |
71e27da9 | 523 | rcu_read_lock(); |
a8cb16dd ED |
524 | in_dev = __in_dev_get_rcu(dev); |
525 | if (!in_dev) { | |
71e27da9 | 526 | rcu_read_unlock(); |
1da177e4 | 527 | goto failure; |
71e27da9 | 528 | } |
1da177e4 | 529 | |
71e27da9 | 530 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 531 | neigh_parms_data_state_setall(in_dev->arp_parms); |
71e27da9 HX |
532 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
533 | rcu_read_unlock(); | |
1da177e4 LT |
534 | |
535 | if (dev_open(dev)) | |
536 | goto failure; | |
537 | ||
7dc00c82 WC |
538 | dev_hold(dev); |
539 | ||
1da177e4 LT |
540 | return dev; |
541 | ||
542 | failure: | |
543 | /* allow the register to be completed before unregistering. */ | |
544 | rtnl_unlock(); | |
545 | rtnl_lock(); | |
546 | ||
547 | unregister_netdevice(dev); | |
548 | return NULL; | |
549 | } | |
550 | #endif | |
551 | ||
2c53040f BH |
552 | /** |
553 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 554 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 555 | */ |
e905a9ed | 556 | |
0c12295a | 557 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 558 | struct list_head *head) |
1da177e4 LT |
559 | { |
560 | struct vif_device *v; | |
561 | struct net_device *dev; | |
562 | struct in_device *in_dev; | |
563 | ||
0c12295a | 564 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
565 | return -EADDRNOTAVAIL; |
566 | ||
0c12295a | 567 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
568 | |
569 | write_lock_bh(&mrt_lock); | |
570 | dev = v->dev; | |
571 | v->dev = NULL; | |
572 | ||
573 | if (!dev) { | |
574 | write_unlock_bh(&mrt_lock); | |
575 | return -EADDRNOTAVAIL; | |
576 | } | |
577 | ||
578 | #ifdef CONFIG_IP_PIMSM | |
0c12295a PM |
579 | if (vifi == mrt->mroute_reg_vif_num) |
580 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 LT |
581 | #endif |
582 | ||
a8cb16dd | 583 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 584 | int tmp; |
a8cb16dd ED |
585 | |
586 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 587 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
588 | break; |
589 | } | |
0c12295a | 590 | mrt->maxvif = tmp+1; |
1da177e4 LT |
591 | } |
592 | ||
593 | write_unlock_bh(&mrt_lock); | |
594 | ||
595 | dev_set_allmulti(dev, -1); | |
596 | ||
a8cb16dd ED |
597 | in_dev = __in_dev_get_rtnl(dev); |
598 | if (in_dev) { | |
42f811b8 | 599 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
d67b8c61 ND |
600 | inet_netconf_notify_devconf(dev_net(dev), |
601 | NETCONFA_MC_FORWARDING, | |
602 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
603 | ip_rt_multicast_event(in_dev); |
604 | } | |
605 | ||
a8cb16dd | 606 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 607 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
608 | |
609 | dev_put(dev); | |
610 | return 0; | |
611 | } | |
612 | ||
a8c9486b | 613 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 614 | { |
a8c9486b ED |
615 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
616 | ||
5c0a66f5 BT |
617 | kmem_cache_free(mrt_cachep, c); |
618 | } | |
619 | ||
a8c9486b ED |
620 | static inline void ipmr_cache_free(struct mfc_cache *c) |
621 | { | |
622 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
623 | } | |
624 | ||
1da177e4 | 625 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 626 | * and reporting error to netlink readers. |
1da177e4 LT |
627 | */ |
628 | ||
0c12295a | 629 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 630 | { |
8de53dfb | 631 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 632 | struct sk_buff *skb; |
9ef1d4c7 | 633 | struct nlmsgerr *e; |
1da177e4 | 634 | |
0c12295a | 635 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 636 | |
c354e124 | 637 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 638 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
639 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
640 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 641 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 642 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 643 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
644 | e->error = -ETIMEDOUT; |
645 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 646 | |
15e47304 | 647 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 648 | } else { |
1da177e4 | 649 | kfree_skb(skb); |
a8cb16dd | 650 | } |
1da177e4 LT |
651 | } |
652 | ||
5c0a66f5 | 653 | ipmr_cache_free(c); |
1da177e4 LT |
654 | } |
655 | ||
656 | ||
e258beb2 | 657 | /* Timer process for the unresolved queue. */ |
1da177e4 | 658 | |
e258beb2 | 659 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 660 | { |
0c12295a | 661 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
662 | unsigned long now; |
663 | unsigned long expires; | |
862465f2 | 664 | struct mfc_cache *c, *next; |
1da177e4 LT |
665 | |
666 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 667 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
668 | return; |
669 | } | |
670 | ||
0c12295a | 671 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
672 | goto out; |
673 | ||
674 | now = jiffies; | |
675 | expires = 10*HZ; | |
1da177e4 | 676 | |
0c12295a | 677 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
678 | if (time_after(c->mfc_un.unres.expires, now)) { |
679 | unsigned long interval = c->mfc_un.unres.expires - now; | |
680 | if (interval < expires) | |
681 | expires = interval; | |
1da177e4 LT |
682 | continue; |
683 | } | |
684 | ||
862465f2 | 685 | list_del(&c->list); |
8cd3ac9f | 686 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 687 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
688 | } |
689 | ||
0c12295a PM |
690 | if (!list_empty(&mrt->mfc_unres_queue)) |
691 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
692 | |
693 | out: | |
694 | spin_unlock(&mfc_unres_lock); | |
695 | } | |
696 | ||
697 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
698 | ||
0c12295a | 699 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 700 | unsigned char *ttls) |
1da177e4 LT |
701 | { |
702 | int vifi; | |
703 | ||
704 | cache->mfc_un.res.minvif = MAXVIFS; | |
705 | cache->mfc_un.res.maxvif = 0; | |
706 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
707 | ||
0c12295a PM |
708 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
709 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 710 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
711 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
712 | if (cache->mfc_un.res.minvif > vifi) | |
713 | cache->mfc_un.res.minvif = vifi; | |
714 | if (cache->mfc_un.res.maxvif <= vifi) | |
715 | cache->mfc_un.res.maxvif = vifi + 1; | |
716 | } | |
717 | } | |
718 | } | |
719 | ||
0c12295a PM |
720 | static int vif_add(struct net *net, struct mr_table *mrt, |
721 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
722 | { |
723 | int vifi = vifc->vifc_vifi; | |
0c12295a | 724 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
725 | struct net_device *dev; |
726 | struct in_device *in_dev; | |
d607032d | 727 | int err; |
1da177e4 LT |
728 | |
729 | /* Is vif busy ? */ | |
0c12295a | 730 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
731 | return -EADDRINUSE; |
732 | ||
733 | switch (vifc->vifc_flags) { | |
734 | #ifdef CONFIG_IP_PIMSM | |
735 | case VIFF_REGISTER: | |
736 | /* | |
737 | * Special Purpose VIF in PIM | |
738 | * All the packets will be sent to the daemon | |
739 | */ | |
0c12295a | 740 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 741 | return -EADDRINUSE; |
f0ad0860 | 742 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
743 | if (!dev) |
744 | return -ENOBUFS; | |
d607032d WC |
745 | err = dev_set_allmulti(dev, 1); |
746 | if (err) { | |
747 | unregister_netdevice(dev); | |
7dc00c82 | 748 | dev_put(dev); |
d607032d WC |
749 | return err; |
750 | } | |
1da177e4 LT |
751 | break; |
752 | #endif | |
e905a9ed | 753 | case VIFF_TUNNEL: |
4feb88e5 | 754 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
755 | if (!dev) |
756 | return -ENOBUFS; | |
d607032d WC |
757 | err = dev_set_allmulti(dev, 1); |
758 | if (err) { | |
759 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 760 | dev_put(dev); |
d607032d WC |
761 | return err; |
762 | } | |
1da177e4 | 763 | break; |
ee5e81f0 I |
764 | |
765 | case VIFF_USE_IFINDEX: | |
1da177e4 | 766 | case 0: |
ee5e81f0 I |
767 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
768 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
51456b29 | 769 | if (dev && !__in_dev_get_rtnl(dev)) { |
ee5e81f0 I |
770 | dev_put(dev); |
771 | return -EADDRNOTAVAIL; | |
772 | } | |
a8cb16dd | 773 | } else { |
ee5e81f0 | 774 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 775 | } |
1da177e4 LT |
776 | if (!dev) |
777 | return -EADDRNOTAVAIL; | |
d607032d | 778 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
779 | if (err) { |
780 | dev_put(dev); | |
d607032d | 781 | return err; |
7dc00c82 | 782 | } |
1da177e4 LT |
783 | break; |
784 | default: | |
785 | return -EINVAL; | |
786 | } | |
787 | ||
a8cb16dd ED |
788 | in_dev = __in_dev_get_rtnl(dev); |
789 | if (!in_dev) { | |
d0490cfd | 790 | dev_put(dev); |
1da177e4 | 791 | return -EADDRNOTAVAIL; |
d0490cfd | 792 | } |
42f811b8 | 793 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
d67b8c61 ND |
794 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex, |
795 | &in_dev->cnf); | |
1da177e4 LT |
796 | ip_rt_multicast_event(in_dev); |
797 | ||
a8cb16dd ED |
798 | /* Fill in the VIF structures */ |
799 | ||
c354e124 JK |
800 | v->rate_limit = vifc->vifc_rate_limit; |
801 | v->local = vifc->vifc_lcl_addr.s_addr; | |
802 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
803 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
804 | if (!mrtsock) |
805 | v->flags |= VIFF_STATIC; | |
c354e124 | 806 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
807 | v->bytes_in = 0; |
808 | v->bytes_out = 0; | |
809 | v->pkt_in = 0; | |
810 | v->pkt_out = 0; | |
811 | v->link = dev->ifindex; | |
a8cb16dd | 812 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
a54acb3a | 813 | v->link = dev_get_iflink(dev); |
1da177e4 LT |
814 | |
815 | /* And finish update writing critical data */ | |
816 | write_lock_bh(&mrt_lock); | |
c354e124 | 817 | v->dev = dev; |
1da177e4 | 818 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 819 | if (v->flags & VIFF_REGISTER) |
0c12295a | 820 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 821 | #endif |
0c12295a PM |
822 | if (vifi+1 > mrt->maxvif) |
823 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
824 | write_unlock_bh(&mrt_lock); |
825 | return 0; | |
826 | } | |
827 | ||
a8c9486b | 828 | /* called with rcu_read_lock() */ |
0c12295a | 829 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
830 | __be32 origin, |
831 | __be32 mcastgrp) | |
1da177e4 | 832 | { |
c354e124 | 833 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
834 | struct mfc_cache *c; |
835 | ||
a8c9486b | 836 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
837 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
838 | return c; | |
1da177e4 | 839 | } |
862465f2 | 840 | return NULL; |
1da177e4 LT |
841 | } |
842 | ||
660b26dc ND |
843 | /* Look for a (*,*,oif) entry */ |
844 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, | |
845 | int vifi) | |
846 | { | |
360eb5da | 847 | int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY)); |
660b26dc ND |
848 | struct mfc_cache *c; |
849 | ||
850 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da ND |
851 | if (c->mfc_origin == htonl(INADDR_ANY) && |
852 | c->mfc_mcastgrp == htonl(INADDR_ANY) && | |
660b26dc ND |
853 | c->mfc_un.res.ttls[vifi] < 255) |
854 | return c; | |
855 | ||
856 | return NULL; | |
857 | } | |
858 | ||
859 | /* Look for a (*,G) entry */ | |
860 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
861 | __be32 mcastgrp, int vifi) | |
862 | { | |
360eb5da | 863 | int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY)); |
660b26dc ND |
864 | struct mfc_cache *c, *proxy; |
865 | ||
360eb5da | 866 | if (mcastgrp == htonl(INADDR_ANY)) |
660b26dc ND |
867 | goto skip; |
868 | ||
869 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da | 870 | if (c->mfc_origin == htonl(INADDR_ANY) && |
660b26dc ND |
871 | c->mfc_mcastgrp == mcastgrp) { |
872 | if (c->mfc_un.res.ttls[vifi] < 255) | |
873 | return c; | |
874 | ||
875 | /* It's ok if the vifi is part of the static tree */ | |
876 | proxy = ipmr_cache_find_any_parent(mrt, | |
877 | c->mfc_parent); | |
878 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) | |
879 | return c; | |
880 | } | |
881 | ||
882 | skip: | |
883 | return ipmr_cache_find_any_parent(mrt, vifi); | |
884 | } | |
885 | ||
1da177e4 LT |
886 | /* |
887 | * Allocate a multicast cache entry | |
888 | */ | |
d658f8a0 | 889 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 890 | { |
c354e124 | 891 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b ED |
892 | |
893 | if (c) | |
894 | c->mfc_un.res.minvif = MAXVIFS; | |
1da177e4 LT |
895 | return c; |
896 | } | |
897 | ||
d658f8a0 | 898 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 899 | { |
c354e124 | 900 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
901 | |
902 | if (c) { | |
903 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
904 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
905 | } | |
1da177e4 LT |
906 | return c; |
907 | } | |
908 | ||
909 | /* | |
910 | * A cache entry has gone into a resolved state from queued | |
911 | */ | |
e905a9ed | 912 | |
0c12295a PM |
913 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
914 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
915 | { |
916 | struct sk_buff *skb; | |
9ef1d4c7 | 917 | struct nlmsgerr *e; |
1da177e4 | 918 | |
a8cb16dd | 919 | /* Play the pending entries through our router */ |
1da177e4 | 920 | |
c354e124 | 921 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 922 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
923 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
924 | ||
573ce260 | 925 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
a8cb16dd ED |
926 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
927 | (u8 *)nlh; | |
1da177e4 LT |
928 | } else { |
929 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 930 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 931 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 932 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
933 | e->error = -EMSGSIZE; |
934 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 935 | } |
2942e900 | 936 | |
15e47304 | 937 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 938 | } else { |
0c12295a | 939 | ip_mr_forward(net, mrt, skb, c, 0); |
a8cb16dd | 940 | } |
1da177e4 LT |
941 | } |
942 | } | |
943 | ||
944 | /* | |
945 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
946 | * expects the following bizarre scheme. | |
947 | * | |
948 | * Called under mrt_lock. | |
949 | */ | |
e905a9ed | 950 | |
0c12295a | 951 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 952 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
953 | { |
954 | struct sk_buff *skb; | |
c9bdd4b5 | 955 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
956 | struct igmphdr *igmp; |
957 | struct igmpmsg *msg; | |
4c968709 | 958 | struct sock *mroute_sk; |
1da177e4 LT |
959 | int ret; |
960 | ||
961 | #ifdef CONFIG_IP_PIMSM | |
962 | if (assert == IGMPMSG_WHOLEPKT) | |
963 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
964 | else | |
965 | #endif | |
966 | skb = alloc_skb(128, GFP_ATOMIC); | |
967 | ||
132adf54 | 968 | if (!skb) |
1da177e4 LT |
969 | return -ENOBUFS; |
970 | ||
971 | #ifdef CONFIG_IP_PIMSM | |
972 | if (assert == IGMPMSG_WHOLEPKT) { | |
973 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
974 | * Duplicate old header, fix ihl, length etc. |
975 | * And all this only to mangle msg->im_msgtype and | |
976 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 977 | */ |
878c8145 ACM |
978 | skb_push(skb, sizeof(struct iphdr)); |
979 | skb_reset_network_header(skb); | |
badff6d0 | 980 | skb_reset_transport_header(skb); |
0272ffc4 | 981 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 982 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
983 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
984 | msg->im_mbz = 0; | |
0c12295a | 985 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
986 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
987 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
988 | sizeof(struct iphdr)); | |
e905a9ed | 989 | } else |
1da177e4 | 990 | #endif |
e905a9ed YH |
991 | { |
992 | ||
a8cb16dd | 993 | /* Copy the IP header */ |
1da177e4 | 994 | |
30f3a40f | 995 | skb_set_network_header(skb, skb->len); |
ddc7b8e3 | 996 | skb_put(skb, ihl); |
27d7ff46 | 997 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
a8cb16dd | 998 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
eddc9ec5 | 999 | msg = (struct igmpmsg *)skb_network_header(skb); |
1da177e4 | 1000 | msg->im_vif = vifi; |
adf30907 | 1001 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 | 1002 | |
a8cb16dd | 1003 | /* Add our header */ |
1da177e4 | 1004 | |
a8cb16dd | 1005 | igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
1006 | igmp->type = |
1007 | msg->im_msgtype = assert; | |
a8cb16dd ED |
1008 | igmp->code = 0; |
1009 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
b0e380b1 | 1010 | skb->transport_header = skb->network_header; |
e905a9ed | 1011 | } |
1da177e4 | 1012 | |
4c968709 ED |
1013 | rcu_read_lock(); |
1014 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
51456b29 | 1015 | if (!mroute_sk) { |
4c968709 | 1016 | rcu_read_unlock(); |
1da177e4 LT |
1017 | kfree_skb(skb); |
1018 | return -EINVAL; | |
1019 | } | |
1020 | ||
a8cb16dd ED |
1021 | /* Deliver to mrouted */ |
1022 | ||
4c968709 ED |
1023 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1024 | rcu_read_unlock(); | |
70a269e6 | 1025 | if (ret < 0) { |
e87cc472 | 1026 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1027 | kfree_skb(skb); |
1028 | } | |
1029 | ||
1030 | return ret; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Queue a packet for resolution. It gets locked cache entry! | |
1035 | */ | |
e905a9ed | 1036 | |
1da177e4 | 1037 | static int |
0c12295a | 1038 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 1039 | { |
862465f2 | 1040 | bool found = false; |
1da177e4 LT |
1041 | int err; |
1042 | struct mfc_cache *c; | |
eddc9ec5 | 1043 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1044 | |
1045 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1046 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1047 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1048 | c->mfc_origin == iph->saddr) { |
1049 | found = true; | |
1da177e4 | 1050 | break; |
862465f2 | 1051 | } |
1da177e4 LT |
1052 | } |
1053 | ||
862465f2 | 1054 | if (!found) { |
a8cb16dd | 1055 | /* Create a new entry if allowable */ |
1da177e4 | 1056 | |
0c12295a | 1057 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1058 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1059 | spin_unlock_bh(&mfc_unres_lock); |
1060 | ||
1061 | kfree_skb(skb); | |
1062 | return -ENOBUFS; | |
1063 | } | |
1064 | ||
a8cb16dd ED |
1065 | /* Fill in the new cache entry */ |
1066 | ||
eddc9ec5 ACM |
1067 | c->mfc_parent = -1; |
1068 | c->mfc_origin = iph->saddr; | |
1069 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1070 | |
a8cb16dd ED |
1071 | /* Reflect first query at mrouted. */ |
1072 | ||
0c12295a | 1073 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1074 | if (err < 0) { |
e905a9ed | 1075 | /* If the report failed throw the cache entry |
1da177e4 LT |
1076 | out - Brad Parker |
1077 | */ | |
1078 | spin_unlock_bh(&mfc_unres_lock); | |
1079 | ||
5c0a66f5 | 1080 | ipmr_cache_free(c); |
1da177e4 LT |
1081 | kfree_skb(skb); |
1082 | return err; | |
1083 | } | |
1084 | ||
0c12295a PM |
1085 | atomic_inc(&mrt->cache_resolve_queue_len); |
1086 | list_add(&c->list, &mrt->mfc_unres_queue); | |
8cd3ac9f | 1087 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1088 | |
278554bd DM |
1089 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1090 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1091 | } |
1092 | ||
a8cb16dd ED |
1093 | /* See if we can append the packet */ |
1094 | ||
1095 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1da177e4 LT |
1096 | kfree_skb(skb); |
1097 | err = -ENOBUFS; | |
1098 | } else { | |
c354e124 | 1099 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1100 | err = 0; |
1101 | } | |
1102 | ||
1103 | spin_unlock_bh(&mfc_unres_lock); | |
1104 | return err; | |
1105 | } | |
1106 | ||
1107 | /* | |
1108 | * MFC cache manipulation by user space mroute daemon | |
1109 | */ | |
1110 | ||
660b26dc | 1111 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 LT |
1112 | { |
1113 | int line; | |
862465f2 | 1114 | struct mfc_cache *c, *next; |
1da177e4 | 1115 | |
c354e124 | 1116 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1117 | |
0c12295a | 1118 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1119 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1120 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1121 | (parent == -1 || parent == c->mfc_parent)) { | |
a8c9486b | 1122 | list_del_rcu(&c->list); |
8cd3ac9f | 1123 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1124 | ipmr_cache_free(c); |
1da177e4 LT |
1125 | return 0; |
1126 | } | |
1127 | } | |
1128 | return -ENOENT; | |
1129 | } | |
1130 | ||
0c12295a | 1131 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1132 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1133 | { |
862465f2 | 1134 | bool found = false; |
1da177e4 | 1135 | int line; |
862465f2 | 1136 | struct mfc_cache *uc, *c; |
1da177e4 | 1137 | |
a50436f2 PM |
1138 | if (mfc->mfcc_parent >= MAXVIFS) |
1139 | return -ENFILE; | |
1140 | ||
c354e124 | 1141 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1142 | |
0c12295a | 1143 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1144 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1145 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1146 | (parent == -1 || parent == c->mfc_parent)) { | |
862465f2 | 1147 | found = true; |
1da177e4 | 1148 | break; |
862465f2 | 1149 | } |
1da177e4 LT |
1150 | } |
1151 | ||
862465f2 | 1152 | if (found) { |
1da177e4 LT |
1153 | write_lock_bh(&mrt_lock); |
1154 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1155 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1156 | if (!mrtsock) |
1157 | c->mfc_flags |= MFC_STATIC; | |
1158 | write_unlock_bh(&mrt_lock); | |
8cd3ac9f | 1159 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1160 | return 0; |
1161 | } | |
1162 | ||
360eb5da | 1163 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1164 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1165 | return -EINVAL; |
1166 | ||
d658f8a0 | 1167 | c = ipmr_cache_alloc(); |
51456b29 | 1168 | if (!c) |
1da177e4 LT |
1169 | return -ENOMEM; |
1170 | ||
c354e124 JK |
1171 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1172 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1173 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1174 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1175 | if (!mrtsock) |
1176 | c->mfc_flags |= MFC_STATIC; | |
1177 | ||
a8c9486b | 1178 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1179 | |
1180 | /* | |
1181 | * Check to see if we resolved a queued list. If so we | |
1182 | * need to send on the frames and tidy up. | |
1183 | */ | |
b0ebb739 | 1184 | found = false; |
1da177e4 | 1185 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1186 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1187 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1188 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1189 | list_del(&uc->list); |
0c12295a | 1190 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1191 | found = true; |
1da177e4 LT |
1192 | break; |
1193 | } | |
1194 | } | |
0c12295a PM |
1195 | if (list_empty(&mrt->mfc_unres_queue)) |
1196 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1197 | spin_unlock_bh(&mfc_unres_lock); |
1198 | ||
b0ebb739 | 1199 | if (found) { |
0c12295a | 1200 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1201 | ipmr_cache_free(uc); |
1da177e4 | 1202 | } |
8cd3ac9f | 1203 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1204 | return 0; |
1205 | } | |
1206 | ||
1207 | /* | |
1208 | * Close the multicast socket, and clear the vif tables etc | |
1209 | */ | |
e905a9ed | 1210 | |
0c12295a | 1211 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1212 | { |
1213 | int i; | |
d17fa6fa | 1214 | LIST_HEAD(list); |
862465f2 | 1215 | struct mfc_cache *c, *next; |
e905a9ed | 1216 | |
a8cb16dd ED |
1217 | /* Shut down all active vif entries */ |
1218 | ||
0c12295a | 1219 | for (i = 0; i < mrt->maxvif; i++) { |
a8cb16dd | 1220 | if (!(mrt->vif_table[i].flags & VIFF_STATIC)) |
0c12295a | 1221 | vif_delete(mrt, i, 0, &list); |
1da177e4 | 1222 | } |
d17fa6fa | 1223 | unregister_netdevice_many(&list); |
1da177e4 | 1224 | |
a8cb16dd ED |
1225 | /* Wipe the cache */ |
1226 | ||
862465f2 | 1227 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1228 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
a8c9486b | 1229 | if (c->mfc_flags & MFC_STATIC) |
1da177e4 | 1230 | continue; |
a8c9486b | 1231 | list_del_rcu(&c->list); |
8cd3ac9f | 1232 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1233 | ipmr_cache_free(c); |
1da177e4 LT |
1234 | } |
1235 | } | |
1236 | ||
0c12295a | 1237 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1238 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1239 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1240 | list_del(&c->list); |
8cd3ac9f | 1241 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 1242 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1243 | } |
1244 | spin_unlock_bh(&mfc_unres_lock); | |
1245 | } | |
1246 | } | |
1247 | ||
4c968709 ED |
1248 | /* called from ip_ra_control(), before an RCU grace period, |
1249 | * we dont need to call synchronize_rcu() here | |
1250 | */ | |
1da177e4 LT |
1251 | static void mrtsock_destruct(struct sock *sk) |
1252 | { | |
4feb88e5 | 1253 | struct net *net = sock_net(sk); |
f0ad0860 | 1254 | struct mr_table *mrt; |
4feb88e5 | 1255 | |
1da177e4 | 1256 | rtnl_lock(); |
f0ad0860 | 1257 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1258 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1259 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
d67b8c61 ND |
1260 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1261 | NETCONFA_IFINDEX_ALL, | |
1262 | net->ipv4.devconf_all); | |
a9b3cd7f | 1263 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
f0ad0860 PM |
1264 | mroute_clean_tables(mrt); |
1265 | } | |
1da177e4 LT |
1266 | } |
1267 | rtnl_unlock(); | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Socket options and virtual interface manipulation. The whole | |
1272 | * virtual interface system is a complete heap, but unfortunately | |
1273 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1274 | * MOSPF/PIM router set up we can clean this up. | |
1275 | */ | |
e905a9ed | 1276 | |
b7058842 | 1277 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 | 1278 | { |
660b26dc | 1279 | int ret, parent = 0; |
1da177e4 LT |
1280 | struct vifctl vif; |
1281 | struct mfcctl mfc; | |
4feb88e5 | 1282 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1283 | struct mr_table *mrt; |
1284 | ||
5e1859fb ED |
1285 | if (sk->sk_type != SOCK_RAW || |
1286 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1287 | return -EOPNOTSUPP; | |
1288 | ||
f0ad0860 | 1289 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1290 | if (!mrt) |
f0ad0860 | 1291 | return -ENOENT; |
e905a9ed | 1292 | |
132adf54 | 1293 | if (optname != MRT_INIT) { |
33d480ce | 1294 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
52e804c6 | 1295 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1296 | return -EACCES; |
1297 | } | |
1298 | ||
132adf54 SH |
1299 | switch (optname) { |
1300 | case MRT_INIT: | |
c354e124 | 1301 | if (optlen != sizeof(int)) |
5e1859fb | 1302 | return -EINVAL; |
1da177e4 | 1303 | |
132adf54 | 1304 | rtnl_lock(); |
4c968709 | 1305 | if (rtnl_dereference(mrt->mroute_sk)) { |
1da177e4 | 1306 | rtnl_unlock(); |
132adf54 SH |
1307 | return -EADDRINUSE; |
1308 | } | |
1309 | ||
1310 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1311 | if (ret == 0) { | |
cf778b00 | 1312 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1313 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
d67b8c61 ND |
1314 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1315 | NETCONFA_IFINDEX_ALL, | |
1316 | net->ipv4.devconf_all); | |
132adf54 SH |
1317 | } |
1318 | rtnl_unlock(); | |
1319 | return ret; | |
1320 | case MRT_DONE: | |
33d480ce | 1321 | if (sk != rcu_access_pointer(mrt->mroute_sk)) |
132adf54 SH |
1322 | return -EACCES; |
1323 | return ip_ra_control(sk, 0, NULL); | |
1324 | case MRT_ADD_VIF: | |
1325 | case MRT_DEL_VIF: | |
c354e124 | 1326 | if (optlen != sizeof(vif)) |
132adf54 | 1327 | return -EINVAL; |
c354e124 | 1328 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1329 | return -EFAULT; |
1330 | if (vif.vifc_vifi >= MAXVIFS) | |
1331 | return -ENFILE; | |
1332 | rtnl_lock(); | |
c354e124 | 1333 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1334 | ret = vif_add(net, mrt, &vif, |
1335 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1336 | } else { |
0c12295a | 1337 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1338 | } |
1339 | rtnl_unlock(); | |
1340 | return ret; | |
1da177e4 LT |
1341 | |
1342 | /* | |
1343 | * Manipulate the forwarding caches. These live | |
1344 | * in a sort of kernel/user symbiosis. | |
1345 | */ | |
132adf54 SH |
1346 | case MRT_ADD_MFC: |
1347 | case MRT_DEL_MFC: | |
660b26dc ND |
1348 | parent = -1; |
1349 | case MRT_ADD_MFC_PROXY: | |
1350 | case MRT_DEL_MFC_PROXY: | |
c354e124 | 1351 | if (optlen != sizeof(mfc)) |
132adf54 | 1352 | return -EINVAL; |
c354e124 | 1353 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 | 1354 | return -EFAULT; |
660b26dc ND |
1355 | if (parent == 0) |
1356 | parent = mfc.mfcc_parent; | |
132adf54 | 1357 | rtnl_lock(); |
660b26dc ND |
1358 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1359 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1360 | else |
4c968709 | 1361 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1362 | sk == rtnl_dereference(mrt->mroute_sk), |
1363 | parent); | |
132adf54 SH |
1364 | rtnl_unlock(); |
1365 | return ret; | |
1da177e4 LT |
1366 | /* |
1367 | * Control PIM assert. | |
1368 | */ | |
132adf54 SH |
1369 | case MRT_ASSERT: |
1370 | { | |
1371 | int v; | |
5e1859fb ED |
1372 | if (optlen != sizeof(v)) |
1373 | return -EINVAL; | |
a8cb16dd | 1374 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1375 | return -EFAULT; |
53d6841d | 1376 | mrt->mroute_do_assert = v; |
132adf54 SH |
1377 | return 0; |
1378 | } | |
1da177e4 | 1379 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1380 | case MRT_PIM: |
1381 | { | |
ba93ef74 SH |
1382 | int v; |
1383 | ||
5e1859fb ED |
1384 | if (optlen != sizeof(v)) |
1385 | return -EINVAL; | |
a8cb16dd | 1386 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1387 | return -EFAULT; |
5e1859fb | 1388 | v = !!v; |
ba93ef74 | 1389 | |
132adf54 SH |
1390 | rtnl_lock(); |
1391 | ret = 0; | |
0c12295a PM |
1392 | if (v != mrt->mroute_do_pim) { |
1393 | mrt->mroute_do_pim = v; | |
1394 | mrt->mroute_do_assert = v; | |
1da177e4 | 1395 | } |
132adf54 SH |
1396 | rtnl_unlock(); |
1397 | return ret; | |
1398 | } | |
f0ad0860 PM |
1399 | #endif |
1400 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1401 | case MRT_TABLE: | |
1402 | { | |
1403 | u32 v; | |
1404 | ||
1405 | if (optlen != sizeof(u32)) | |
1406 | return -EINVAL; | |
1407 | if (get_user(v, (u32 __user *)optval)) | |
1408 | return -EFAULT; | |
f0ad0860 | 1409 | |
b49d3c1e ED |
1410 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
1411 | if (v != RT_TABLE_DEFAULT && v >= 1000000000) | |
1412 | return -EINVAL; | |
1413 | ||
f0ad0860 PM |
1414 | rtnl_lock(); |
1415 | ret = 0; | |
4c968709 ED |
1416 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1417 | ret = -EBUSY; | |
1418 | } else { | |
1419 | if (!ipmr_new_table(net, v)) | |
1420 | ret = -ENOMEM; | |
5e1859fb ED |
1421 | else |
1422 | raw_sk(sk)->ipmr_table = v; | |
4c968709 | 1423 | } |
f0ad0860 PM |
1424 | rtnl_unlock(); |
1425 | return ret; | |
1426 | } | |
1da177e4 | 1427 | #endif |
132adf54 SH |
1428 | /* |
1429 | * Spurious command, or MRT_VERSION which you cannot | |
1430 | * set. | |
1431 | */ | |
1432 | default: | |
1433 | return -ENOPROTOOPT; | |
1da177e4 LT |
1434 | } |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * Getsock opt support for the multicast routing system. | |
1439 | */ | |
e905a9ed | 1440 | |
c354e124 | 1441 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1442 | { |
1443 | int olr; | |
1444 | int val; | |
4feb88e5 | 1445 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1446 | struct mr_table *mrt; |
1447 | ||
5e1859fb ED |
1448 | if (sk->sk_type != SOCK_RAW || |
1449 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1450 | return -EOPNOTSUPP; | |
1451 | ||
f0ad0860 | 1452 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1453 | if (!mrt) |
f0ad0860 | 1454 | return -ENOENT; |
1da177e4 | 1455 | |
c354e124 | 1456 | if (optname != MRT_VERSION && |
1da177e4 | 1457 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 1458 | optname != MRT_PIM && |
1da177e4 | 1459 | #endif |
a8cb16dd | 1460 | optname != MRT_ASSERT) |
1da177e4 LT |
1461 | return -ENOPROTOOPT; |
1462 | ||
1463 | if (get_user(olr, optlen)) | |
1464 | return -EFAULT; | |
1465 | ||
1466 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1467 | if (olr < 0) | |
1468 | return -EINVAL; | |
e905a9ed | 1469 | |
c354e124 | 1470 | if (put_user(olr, optlen)) |
1da177e4 | 1471 | return -EFAULT; |
c354e124 JK |
1472 | if (optname == MRT_VERSION) |
1473 | val = 0x0305; | |
1da177e4 | 1474 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1475 | else if (optname == MRT_PIM) |
0c12295a | 1476 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1477 | #endif |
1478 | else | |
0c12295a | 1479 | val = mrt->mroute_do_assert; |
c354e124 | 1480 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1481 | return -EFAULT; |
1482 | return 0; | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * The IP multicast ioctl support routines. | |
1487 | */ | |
e905a9ed | 1488 | |
1da177e4 LT |
1489 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1490 | { | |
1491 | struct sioc_sg_req sr; | |
1492 | struct sioc_vif_req vr; | |
1493 | struct vif_device *vif; | |
1494 | struct mfc_cache *c; | |
4feb88e5 | 1495 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1496 | struct mr_table *mrt; |
1497 | ||
1498 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1499 | if (!mrt) |
f0ad0860 | 1500 | return -ENOENT; |
e905a9ed | 1501 | |
132adf54 SH |
1502 | switch (cmd) { |
1503 | case SIOCGETVIFCNT: | |
c354e124 | 1504 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1505 | return -EFAULT; |
0c12295a | 1506 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1507 | return -EINVAL; |
1508 | read_lock(&mrt_lock); | |
0c12295a PM |
1509 | vif = &mrt->vif_table[vr.vifi]; |
1510 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1511 | vr.icount = vif->pkt_in; |
1512 | vr.ocount = vif->pkt_out; | |
1513 | vr.ibytes = vif->bytes_in; | |
1514 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1515 | read_unlock(&mrt_lock); |
1da177e4 | 1516 | |
c354e124 | 1517 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1518 | return -EFAULT; |
1519 | return 0; | |
1520 | } | |
1521 | read_unlock(&mrt_lock); | |
1522 | return -EADDRNOTAVAIL; | |
1523 | case SIOCGETSGCNT: | |
c354e124 | 1524 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1525 | return -EFAULT; |
1526 | ||
a8c9486b | 1527 | rcu_read_lock(); |
0c12295a | 1528 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1529 | if (c) { |
1530 | sr.pktcnt = c->mfc_un.res.pkt; | |
1531 | sr.bytecnt = c->mfc_un.res.bytes; | |
1532 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1533 | rcu_read_unlock(); |
132adf54 | 1534 | |
c354e124 | 1535 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1536 | return -EFAULT; |
1537 | return 0; | |
1538 | } | |
a8c9486b | 1539 | rcu_read_unlock(); |
132adf54 SH |
1540 | return -EADDRNOTAVAIL; |
1541 | default: | |
1542 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1543 | } |
1544 | } | |
1545 | ||
709b46e8 EB |
1546 | #ifdef CONFIG_COMPAT |
1547 | struct compat_sioc_sg_req { | |
1548 | struct in_addr src; | |
1549 | struct in_addr grp; | |
1550 | compat_ulong_t pktcnt; | |
1551 | compat_ulong_t bytecnt; | |
1552 | compat_ulong_t wrong_if; | |
1553 | }; | |
1554 | ||
ca6b8bb0 DM |
1555 | struct compat_sioc_vif_req { |
1556 | vifi_t vifi; /* Which iface */ | |
1557 | compat_ulong_t icount; | |
1558 | compat_ulong_t ocount; | |
1559 | compat_ulong_t ibytes; | |
1560 | compat_ulong_t obytes; | |
1561 | }; | |
1562 | ||
709b46e8 EB |
1563 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1564 | { | |
0033d5ad | 1565 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1566 | struct compat_sioc_vif_req vr; |
1567 | struct vif_device *vif; | |
709b46e8 EB |
1568 | struct mfc_cache *c; |
1569 | struct net *net = sock_net(sk); | |
1570 | struct mr_table *mrt; | |
1571 | ||
1572 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1573 | if (!mrt) |
709b46e8 EB |
1574 | return -ENOENT; |
1575 | ||
1576 | switch (cmd) { | |
ca6b8bb0 DM |
1577 | case SIOCGETVIFCNT: |
1578 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1579 | return -EFAULT; | |
1580 | if (vr.vifi >= mrt->maxvif) | |
1581 | return -EINVAL; | |
1582 | read_lock(&mrt_lock); | |
1583 | vif = &mrt->vif_table[vr.vifi]; | |
1584 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1585 | vr.icount = vif->pkt_in; | |
1586 | vr.ocount = vif->pkt_out; | |
1587 | vr.ibytes = vif->bytes_in; | |
1588 | vr.obytes = vif->bytes_out; | |
1589 | read_unlock(&mrt_lock); | |
1590 | ||
1591 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1592 | return -EFAULT; | |
1593 | return 0; | |
1594 | } | |
1595 | read_unlock(&mrt_lock); | |
1596 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1597 | case SIOCGETSGCNT: |
1598 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1599 | return -EFAULT; | |
1600 | ||
1601 | rcu_read_lock(); | |
1602 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1603 | if (c) { | |
1604 | sr.pktcnt = c->mfc_un.res.pkt; | |
1605 | sr.bytecnt = c->mfc_un.res.bytes; | |
1606 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1607 | rcu_read_unlock(); | |
1608 | ||
1609 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1610 | return -EFAULT; | |
1611 | return 0; | |
1612 | } | |
1613 | rcu_read_unlock(); | |
1614 | return -EADDRNOTAVAIL; | |
1615 | default: | |
1616 | return -ENOIOCTLCMD; | |
1617 | } | |
1618 | } | |
1619 | #endif | |
1620 | ||
1da177e4 LT |
1621 | |
1622 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1623 | { | |
351638e7 | 1624 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1625 | struct net *net = dev_net(dev); |
f0ad0860 | 1626 | struct mr_table *mrt; |
1da177e4 LT |
1627 | struct vif_device *v; |
1628 | int ct; | |
e9dc8653 | 1629 | |
1da177e4 LT |
1630 | if (event != NETDEV_UNREGISTER) |
1631 | return NOTIFY_DONE; | |
f0ad0860 PM |
1632 | |
1633 | ipmr_for_each_table(mrt, net) { | |
1634 | v = &mrt->vif_table[0]; | |
1635 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1636 | if (v->dev == dev) | |
e92036a6 | 1637 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1638 | } |
1da177e4 LT |
1639 | } |
1640 | return NOTIFY_DONE; | |
1641 | } | |
1642 | ||
1643 | ||
c354e124 | 1644 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1645 | .notifier_call = ipmr_device_event, |
1646 | }; | |
1647 | ||
1648 | /* | |
a8cb16dd | 1649 | * Encapsulate a packet by attaching a valid IPIP header to it. |
1da177e4 LT |
1650 | * This avoids tunnel drivers and other mess and gives us the speed so |
1651 | * important for multicast video. | |
1652 | */ | |
e905a9ed | 1653 | |
b6a7719a HFS |
1654 | static void ip_encap(struct net *net, struct sk_buff *skb, |
1655 | __be32 saddr, __be32 daddr) | |
1da177e4 | 1656 | { |
8856dfa3 | 1657 | struct iphdr *iph; |
b71d1d42 | 1658 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1659 | |
1660 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1661 | skb->transport_header = skb->network_header; |
8856dfa3 | 1662 | skb_reset_network_header(skb); |
eddc9ec5 | 1663 | iph = ip_hdr(skb); |
1da177e4 | 1664 | |
a8cb16dd | 1665 | iph->version = 4; |
e023dd64 ACM |
1666 | iph->tos = old_iph->tos; |
1667 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1668 | iph->frag_off = 0; |
1669 | iph->daddr = daddr; | |
1670 | iph->saddr = saddr; | |
1671 | iph->protocol = IPPROTO_IPIP; | |
1672 | iph->ihl = 5; | |
1673 | iph->tot_len = htons(skb->len); | |
b6a7719a | 1674 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1675 | ip_send_check(iph); |
1676 | ||
1da177e4 LT |
1677 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1678 | nf_reset(skb); | |
1679 | } | |
1680 | ||
7026b1dd | 1681 | static inline int ipmr_forward_finish(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1682 | { |
a8cb16dd | 1683 | struct ip_options *opt = &(IPCB(skb)->opt); |
758ccac8 | 1684 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 | 1685 | |
758ccac8 EB |
1686 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
1687 | IP_ADD_STATS_BH(net, IPSTATS_MIB_OUTOCTETS, skb->len); | |
1da177e4 LT |
1688 | |
1689 | if (unlikely(opt->optlen)) | |
1690 | ip_forward_options(skb); | |
1691 | ||
5a70649e | 1692 | return dst_output(sk, skb); |
1da177e4 LT |
1693 | } |
1694 | ||
1695 | /* | |
1696 | * Processing handlers for ipmr_forward | |
1697 | */ | |
1698 | ||
0c12295a PM |
1699 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1700 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1701 | { |
eddc9ec5 | 1702 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1703 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1704 | struct net_device *dev; |
1705 | struct rtable *rt; | |
31e4543d | 1706 | struct flowi4 fl4; |
1da177e4 LT |
1707 | int encap = 0; |
1708 | ||
51456b29 | 1709 | if (!vif->dev) |
1da177e4 LT |
1710 | goto out_free; |
1711 | ||
1712 | #ifdef CONFIG_IP_PIMSM | |
1713 | if (vif->flags & VIFF_REGISTER) { | |
1714 | vif->pkt_out++; | |
c354e124 | 1715 | vif->bytes_out += skb->len; |
cf3677ae PE |
1716 | vif->dev->stats.tx_bytes += skb->len; |
1717 | vif->dev->stats.tx_packets++; | |
0c12295a | 1718 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1719 | goto out_free; |
1da177e4 LT |
1720 | } |
1721 | #endif | |
1722 | ||
a8cb16dd | 1723 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1724 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1725 | vif->remote, vif->local, |
1726 | 0, 0, | |
1727 | IPPROTO_IPIP, | |
1728 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1729 | if (IS_ERR(rt)) |
1da177e4 LT |
1730 | goto out_free; |
1731 | encap = sizeof(struct iphdr); | |
1732 | } else { | |
31e4543d | 1733 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1734 | 0, 0, |
1735 | IPPROTO_IPIP, | |
1736 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1737 | if (IS_ERR(rt)) |
1da177e4 LT |
1738 | goto out_free; |
1739 | } | |
1740 | ||
d8d1f30b | 1741 | dev = rt->dst.dev; |
1da177e4 | 1742 | |
d8d1f30b | 1743 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1744 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1745 | * allow to send ICMP, so that packets will disappear |
1746 | * to blackhole. | |
1da177e4 LT |
1747 | */ |
1748 | ||
cc4c851e | 1749 | IP_INC_STATS_BH(net, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1750 | ip_rt_put(rt); |
1751 | goto out_free; | |
1752 | } | |
1753 | ||
d8d1f30b | 1754 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1755 | |
1756 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1757 | ip_rt_put(rt); |
1da177e4 LT |
1758 | goto out_free; |
1759 | } | |
1760 | ||
1761 | vif->pkt_out++; | |
c354e124 | 1762 | vif->bytes_out += skb->len; |
1da177e4 | 1763 | |
adf30907 | 1764 | skb_dst_drop(skb); |
d8d1f30b | 1765 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1766 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1767 | |
1768 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1769 | * What do we do with netfilter? -- RR |
1770 | */ | |
1da177e4 | 1771 | if (vif->flags & VIFF_TUNNEL) { |
b6a7719a | 1772 | ip_encap(net, skb, vif->local, vif->remote); |
1da177e4 | 1773 | /* FIXME: extra output firewall step used to be here. --RR */ |
2f4c02d4 PE |
1774 | vif->dev->stats.tx_packets++; |
1775 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1776 | } |
1777 | ||
1778 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1779 | ||
1780 | /* | |
1781 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1782 | * not only before forwarding, but after forwarding on all output | |
1783 | * interfaces. It is clear, if mrouter runs a multicasting | |
1784 | * program, it should receive packets not depending to what interface | |
1785 | * program is joined. | |
1786 | * If we will not make it, the program will have to join on all | |
1787 | * interfaces. On the other hand, multihoming host (or router, but | |
1788 | * not mrouter) cannot join to more than one interface - it will | |
1789 | * result in receiving multiple packets. | |
1790 | */ | |
7026b1dd DM |
1791 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, NULL, skb, |
1792 | skb->dev, dev, | |
1da177e4 LT |
1793 | ipmr_forward_finish); |
1794 | return; | |
1795 | ||
1796 | out_free: | |
1797 | kfree_skb(skb); | |
1da177e4 LT |
1798 | } |
1799 | ||
0c12295a | 1800 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1801 | { |
1802 | int ct; | |
0c12295a PM |
1803 | |
1804 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1805 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1806 | break; |
1807 | } | |
1808 | return ct; | |
1809 | } | |
1810 | ||
1811 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1812 | ||
c4854ec8 RR |
1813 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
1814 | struct sk_buff *skb, struct mfc_cache *cache, | |
1815 | int local) | |
1da177e4 LT |
1816 | { |
1817 | int psend = -1; | |
1818 | int vif, ct; | |
660b26dc | 1819 | int true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 LT |
1820 | |
1821 | vif = cache->mfc_parent; | |
1822 | cache->mfc_un.res.pkt++; | |
1823 | cache->mfc_un.res.bytes += skb->len; | |
1824 | ||
360eb5da | 1825 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1826 | struct mfc_cache *cache_proxy; |
1827 | ||
1828 | /* For an (*,G) entry, we only check that the incomming | |
1829 | * interface is part of the static tree. | |
1830 | */ | |
1831 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); | |
1832 | if (cache_proxy && | |
1833 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) | |
1834 | goto forward; | |
1835 | } | |
1836 | ||
1da177e4 LT |
1837 | /* |
1838 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1839 | */ | |
0c12295a | 1840 | if (mrt->vif_table[vif].dev != skb->dev) { |
c7537967 | 1841 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1842 | /* It is our own packet, looped back. |
a8cb16dd ED |
1843 | * Very complicated situation... |
1844 | * | |
1845 | * The best workaround until routing daemons will be | |
1846 | * fixed is not to redistribute packet, if it was | |
1847 | * send through wrong interface. It means, that | |
1848 | * multicast applications WILL NOT work for | |
1849 | * (S,G), which have default multicast route pointing | |
1850 | * to wrong oif. In any case, it is not a good | |
1851 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1852 | */ |
1853 | goto dont_forward; | |
1854 | } | |
1855 | ||
1856 | cache->mfc_un.res.wrong_if++; | |
1da177e4 | 1857 | |
0c12295a | 1858 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1859 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1860 | * so that we cannot check that packet arrived on an oif. |
1861 | * It is bad, but otherwise we would need to move pretty | |
1862 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1863 | */ |
0c12295a | 1864 | (mrt->mroute_do_pim || |
6f9374a9 | 1865 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1866 | time_after(jiffies, |
1da177e4 LT |
1867 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1868 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1869 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1870 | } |
1871 | goto dont_forward; | |
1872 | } | |
1873 | ||
660b26dc | 1874 | forward: |
0c12295a PM |
1875 | mrt->vif_table[vif].pkt_in++; |
1876 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1877 | |
1878 | /* | |
1879 | * Forward the frame | |
1880 | */ | |
360eb5da ND |
1881 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
1882 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc ND |
1883 | if (true_vifi >= 0 && |
1884 | true_vifi != cache->mfc_parent && | |
1885 | ip_hdr(skb)->ttl > | |
1886 | cache->mfc_un.res.ttls[cache->mfc_parent]) { | |
1887 | /* It's an (*,*) entry and the packet is not coming from | |
1888 | * the upstream: forward the packet to the upstream | |
1889 | * only. | |
1890 | */ | |
1891 | psend = cache->mfc_parent; | |
1892 | goto last_forward; | |
1893 | } | |
1894 | goto dont_forward; | |
1895 | } | |
a8cb16dd ED |
1896 | for (ct = cache->mfc_un.res.maxvif - 1; |
1897 | ct >= cache->mfc_un.res.minvif; ct--) { | |
660b26dc | 1898 | /* For (*,G) entry, don't forward to the incoming interface */ |
360eb5da ND |
1899 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
1900 | ct != true_vifi) && | |
660b26dc | 1901 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1902 | if (psend != -1) { |
1903 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1904 | |
1da177e4 | 1905 | if (skb2) |
0c12295a PM |
1906 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1907 | psend); | |
1da177e4 | 1908 | } |
c354e124 | 1909 | psend = ct; |
1da177e4 LT |
1910 | } |
1911 | } | |
660b26dc | 1912 | last_forward: |
1da177e4 LT |
1913 | if (psend != -1) { |
1914 | if (local) { | |
1915 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1916 | |
1da177e4 | 1917 | if (skb2) |
0c12295a | 1918 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1919 | } else { |
0c12295a | 1920 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
c4854ec8 | 1921 | return; |
1da177e4 LT |
1922 | } |
1923 | } | |
1924 | ||
1925 | dont_forward: | |
1926 | if (!local) | |
1927 | kfree_skb(skb); | |
1da177e4 LT |
1928 | } |
1929 | ||
417da66f | 1930 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 1931 | { |
417da66f DM |
1932 | struct rtable *rt = skb_rtable(skb); |
1933 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 1934 | struct flowi4 fl4 = { |
417da66f DM |
1935 | .daddr = iph->daddr, |
1936 | .saddr = iph->saddr, | |
b0fe4a31 | 1937 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
1938 | .flowi4_oif = (rt_is_output_route(rt) ? |
1939 | skb->dev->ifindex : 0), | |
1940 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 1941 | LOOPBACK_IFINDEX : |
4fd551d7 | 1942 | skb->dev->ifindex), |
b4869889 | 1943 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
1944 | }; |
1945 | struct mr_table *mrt; | |
1946 | int err; | |
1947 | ||
da91981b | 1948 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
1949 | if (err) |
1950 | return ERR_PTR(err); | |
1951 | return mrt; | |
1952 | } | |
1da177e4 LT |
1953 | |
1954 | /* | |
1955 | * Multicast packets for forwarding arrive here | |
4c968709 | 1956 | * Called with rcu_read_lock(); |
1da177e4 LT |
1957 | */ |
1958 | ||
1959 | int ip_mr_input(struct sk_buff *skb) | |
1960 | { | |
1961 | struct mfc_cache *cache; | |
4feb88e5 | 1962 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1963 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 1964 | struct mr_table *mrt; |
1da177e4 LT |
1965 | |
1966 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 1967 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 1968 | */ |
4c968709 | 1969 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
1970 | goto dont_forward; |
1971 | ||
417da66f | 1972 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
1973 | if (IS_ERR(mrt)) { |
1974 | kfree_skb(skb); | |
1975 | return PTR_ERR(mrt); | |
e40dbc51 | 1976 | } |
1da177e4 | 1977 | if (!local) { |
4c968709 ED |
1978 | if (IPCB(skb)->opt.router_alert) { |
1979 | if (ip_call_ra_chain(skb)) | |
1980 | return 0; | |
1981 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1982 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1983 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1984 | * option to IGMP packets destined to routable | |
1985 | * groups. It is very bad, because it means | |
1986 | * that we can forward NO IGMP messages. | |
1987 | */ | |
1988 | struct sock *mroute_sk; | |
1989 | ||
1990 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1991 | if (mroute_sk) { | |
1992 | nf_reset(skb); | |
1993 | raw_rcv(mroute_sk, skb); | |
1994 | return 0; | |
1995 | } | |
1da177e4 LT |
1996 | } |
1997 | } | |
1998 | ||
a8c9486b | 1999 | /* already under rcu_read_lock() */ |
0c12295a | 2000 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
51456b29 | 2001 | if (!cache) { |
660b26dc ND |
2002 | int vif = ipmr_find_vif(mrt, skb->dev); |
2003 | ||
2004 | if (vif >= 0) | |
2005 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
2006 | vif); | |
2007 | } | |
1da177e4 LT |
2008 | |
2009 | /* | |
2010 | * No usable cache entry | |
2011 | */ | |
51456b29 | 2012 | if (!cache) { |
1da177e4 LT |
2013 | int vif; |
2014 | ||
2015 | if (local) { | |
2016 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2017 | ip_local_deliver(skb); | |
51456b29 | 2018 | if (!skb2) |
1da177e4 | 2019 | return -ENOBUFS; |
1da177e4 LT |
2020 | skb = skb2; |
2021 | } | |
2022 | ||
a8c9486b | 2023 | read_lock(&mrt_lock); |
0c12295a | 2024 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2025 | if (vif >= 0) { |
0eae88f3 | 2026 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
2027 | read_unlock(&mrt_lock); |
2028 | ||
0eae88f3 | 2029 | return err2; |
1da177e4 LT |
2030 | } |
2031 | read_unlock(&mrt_lock); | |
2032 | kfree_skb(skb); | |
2033 | return -ENODEV; | |
2034 | } | |
2035 | ||
a8c9486b | 2036 | read_lock(&mrt_lock); |
0c12295a | 2037 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
2038 | read_unlock(&mrt_lock); |
2039 | ||
2040 | if (local) | |
2041 | return ip_local_deliver(skb); | |
2042 | ||
2043 | return 0; | |
2044 | ||
2045 | dont_forward: | |
2046 | if (local) | |
2047 | return ip_local_deliver(skb); | |
2048 | kfree_skb(skb); | |
2049 | return 0; | |
2050 | } | |
2051 | ||
b1879204 | 2052 | #ifdef CONFIG_IP_PIMSM |
55747a0a | 2053 | /* called with rcu_read_lock() */ |
f0ad0860 PM |
2054 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
2055 | unsigned int pimlen) | |
1da177e4 | 2056 | { |
b1879204 IJ |
2057 | struct net_device *reg_dev = NULL; |
2058 | struct iphdr *encap; | |
1da177e4 | 2059 | |
b1879204 | 2060 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 | 2061 | /* |
a8cb16dd ED |
2062 | * Check that: |
2063 | * a. packet is really sent to a multicast group | |
2064 | * b. packet is not a NULL-REGISTER | |
2065 | * c. packet is not truncated | |
1da177e4 | 2066 | */ |
f97c1e0c | 2067 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 2068 | encap->tot_len == 0 || |
b1879204 IJ |
2069 | ntohs(encap->tot_len) + pimlen > skb->len) |
2070 | return 1; | |
1da177e4 LT |
2071 | |
2072 | read_lock(&mrt_lock); | |
0c12295a PM |
2073 | if (mrt->mroute_reg_vif_num >= 0) |
2074 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
2075 | read_unlock(&mrt_lock); |
2076 | ||
51456b29 | 2077 | if (!reg_dev) |
b1879204 | 2078 | return 1; |
1da177e4 | 2079 | |
b0e380b1 | 2080 | skb->mac_header = skb->network_header; |
55747a0a | 2081 | skb_pull(skb, (u8 *)encap - skb->data); |
31c7711b | 2082 | skb_reset_network_header(skb); |
1da177e4 | 2083 | skb->protocol = htons(ETH_P_IP); |
55747a0a | 2084 | skb->ip_summed = CHECKSUM_NONE; |
d19d56dd | 2085 | |
ea23192e | 2086 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
d19d56dd | 2087 | |
1da177e4 | 2088 | netif_rx(skb); |
b1879204 | 2089 | |
55747a0a | 2090 | return NET_RX_SUCCESS; |
b1879204 IJ |
2091 | } |
2092 | #endif | |
2093 | ||
2094 | #ifdef CONFIG_IP_PIMSM_V1 | |
2095 | /* | |
2096 | * Handle IGMP messages of PIMv1 | |
2097 | */ | |
2098 | ||
a8cb16dd | 2099 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2100 | { |
2101 | struct igmphdr *pim; | |
4feb88e5 | 2102 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2103 | struct mr_table *mrt; |
b1879204 IJ |
2104 | |
2105 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2106 | goto drop; | |
2107 | ||
2108 | pim = igmp_hdr(skb); | |
2109 | ||
417da66f | 2110 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2111 | if (IS_ERR(mrt)) |
2112 | goto drop; | |
0c12295a | 2113 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2114 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2115 | goto drop; | |
2116 | ||
f0ad0860 | 2117 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2118 | drop: |
2119 | kfree_skb(skb); | |
2120 | } | |
1da177e4 LT |
2121 | return 0; |
2122 | } | |
2123 | #endif | |
2124 | ||
2125 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2126 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2127 | { |
2128 | struct pimreghdr *pim; | |
f0ad0860 PM |
2129 | struct net *net = dev_net(skb->dev); |
2130 | struct mr_table *mrt; | |
1da177e4 | 2131 | |
b1879204 | 2132 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2133 | goto drop; |
2134 | ||
9c70220b | 2135 | pim = (struct pimreghdr *)skb_transport_header(skb); |
a8cb16dd ED |
2136 | if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || |
2137 | (pim->flags & PIM_NULL_REGISTER) || | |
e905a9ed | 2138 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2139 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2140 | goto drop; |
2141 | ||
417da66f | 2142 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2143 | if (IS_ERR(mrt)) |
2144 | goto drop; | |
f0ad0860 | 2145 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2146 | drop: |
2147 | kfree_skb(skb); | |
2148 | } | |
1da177e4 LT |
2149 | return 0; |
2150 | } | |
2151 | #endif | |
2152 | ||
cb6a4e46 PM |
2153 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2154 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 LT |
2155 | { |
2156 | int ct; | |
2157 | struct rtnexthop *nhp; | |
92a395e5 | 2158 | struct nlattr *mp_attr; |
adfa85e4 | 2159 | struct rta_mfc_stats mfcs; |
1da177e4 | 2160 | |
7438189b | 2161 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2162 | if (c->mfc_parent >= MAXVIFS) |
7438189b ND |
2163 | return -ENOENT; |
2164 | ||
92a395e5 TG |
2165 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
2166 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) | |
2167 | return -EMSGSIZE; | |
1da177e4 | 2168 | |
92a395e5 TG |
2169 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
2170 | return -EMSGSIZE; | |
1da177e4 LT |
2171 | |
2172 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 2173 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
92a395e5 TG |
2174 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
2175 | nla_nest_cancel(skb, mp_attr); | |
2176 | return -EMSGSIZE; | |
2177 | } | |
2178 | ||
1da177e4 LT |
2179 | nhp->rtnh_flags = 0; |
2180 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 2181 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
2182 | nhp->rtnh_len = sizeof(*nhp); |
2183 | } | |
2184 | } | |
92a395e5 TG |
2185 | |
2186 | nla_nest_end(skb, mp_attr); | |
2187 | ||
adfa85e4 ND |
2188 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2189 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2190 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
2191 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) | |
2192 | return -EMSGSIZE; | |
2193 | ||
1da177e4 LT |
2194 | rtm->rtm_type = RTN_MULTICAST; |
2195 | return 1; | |
1da177e4 LT |
2196 | } |
2197 | ||
9a1b9496 DM |
2198 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2199 | __be32 saddr, __be32 daddr, | |
2200 | struct rtmsg *rtm, int nowait) | |
1da177e4 | 2201 | { |
1da177e4 | 2202 | struct mfc_cache *cache; |
9a1b9496 DM |
2203 | struct mr_table *mrt; |
2204 | int err; | |
1da177e4 | 2205 | |
f0ad0860 | 2206 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2207 | if (!mrt) |
f0ad0860 PM |
2208 | return -ENOENT; |
2209 | ||
a8c9486b | 2210 | rcu_read_lock(); |
9a1b9496 | 2211 | cache = ipmr_cache_find(mrt, saddr, daddr); |
51456b29 | 2212 | if (!cache && skb->dev) { |
660b26dc | 2213 | int vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2214 | |
660b26dc ND |
2215 | if (vif >= 0) |
2216 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2217 | } | |
51456b29 | 2218 | if (!cache) { |
72287490 | 2219 | struct sk_buff *skb2; |
eddc9ec5 | 2220 | struct iphdr *iph; |
1da177e4 | 2221 | struct net_device *dev; |
a8cb16dd | 2222 | int vif = -1; |
1da177e4 LT |
2223 | |
2224 | if (nowait) { | |
a8c9486b | 2225 | rcu_read_unlock(); |
1da177e4 LT |
2226 | return -EAGAIN; |
2227 | } | |
2228 | ||
2229 | dev = skb->dev; | |
a8c9486b | 2230 | read_lock(&mrt_lock); |
a8cb16dd ED |
2231 | if (dev) |
2232 | vif = ipmr_find_vif(mrt, dev); | |
2233 | if (vif < 0) { | |
1da177e4 | 2234 | read_unlock(&mrt_lock); |
a8c9486b | 2235 | rcu_read_unlock(); |
1da177e4 LT |
2236 | return -ENODEV; |
2237 | } | |
72287490 AK |
2238 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2239 | if (!skb2) { | |
2240 | read_unlock(&mrt_lock); | |
a8c9486b | 2241 | rcu_read_unlock(); |
72287490 AK |
2242 | return -ENOMEM; |
2243 | } | |
2244 | ||
e2d1bca7 ACM |
2245 | skb_push(skb2, sizeof(struct iphdr)); |
2246 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2247 | iph = ip_hdr(skb2); |
2248 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2249 | iph->saddr = saddr; |
2250 | iph->daddr = daddr; | |
eddc9ec5 | 2251 | iph->version = 0; |
0c12295a | 2252 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 | 2253 | read_unlock(&mrt_lock); |
a8c9486b | 2254 | rcu_read_unlock(); |
1da177e4 LT |
2255 | return err; |
2256 | } | |
2257 | ||
a8c9486b ED |
2258 | read_lock(&mrt_lock); |
2259 | if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) | |
1da177e4 | 2260 | cache->mfc_flags |= MFC_NOTIFY; |
cb6a4e46 | 2261 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2262 | read_unlock(&mrt_lock); |
a8c9486b | 2263 | rcu_read_unlock(); |
1da177e4 LT |
2264 | return err; |
2265 | } | |
2266 | ||
cb6a4e46 | 2267 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2268 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2269 | int flags) | |
cb6a4e46 PM |
2270 | { |
2271 | struct nlmsghdr *nlh; | |
2272 | struct rtmsg *rtm; | |
1eb99af5 | 2273 | int err; |
cb6a4e46 | 2274 | |
65886f43 | 2275 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
51456b29 | 2276 | if (!nlh) |
cb6a4e46 PM |
2277 | return -EMSGSIZE; |
2278 | ||
2279 | rtm = nlmsg_data(nlh); | |
2280 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2281 | rtm->rtm_dst_len = 32; | |
2282 | rtm->rtm_src_len = 32; | |
2283 | rtm->rtm_tos = 0; | |
2284 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2285 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2286 | goto nla_put_failure; | |
cb6a4e46 PM |
2287 | rtm->rtm_type = RTN_MULTICAST; |
2288 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
9a68ac72 ND |
2289 | if (c->mfc_flags & MFC_STATIC) |
2290 | rtm->rtm_protocol = RTPROT_STATIC; | |
2291 | else | |
2292 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2293 | rtm->rtm_flags = 0; |
2294 | ||
930345ea JB |
2295 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
2296 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) | |
f3756b79 | 2297 | goto nla_put_failure; |
1eb99af5 ND |
2298 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
2299 | /* do not break the dump if cache is unresolved */ | |
2300 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2301 | goto nla_put_failure; |
2302 | ||
053c095a JB |
2303 | nlmsg_end(skb, nlh); |
2304 | return 0; | |
cb6a4e46 PM |
2305 | |
2306 | nla_put_failure: | |
2307 | nlmsg_cancel(skb, nlh); | |
2308 | return -EMSGSIZE; | |
2309 | } | |
2310 | ||
8cd3ac9f ND |
2311 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2312 | { | |
2313 | size_t len = | |
2314 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2315 | + nla_total_size(4) /* RTA_TABLE */ | |
2316 | + nla_total_size(4) /* RTA_SRC */ | |
2317 | + nla_total_size(4) /* RTA_DST */ | |
2318 | ; | |
2319 | ||
2320 | if (!unresolved) | |
2321 | len = len | |
2322 | + nla_total_size(4) /* RTA_IIF */ | |
2323 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2324 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2325 | /* RTA_MFC_STATS */ | |
2326 | + nla_total_size(sizeof(struct rta_mfc_stats)) | |
2327 | ; | |
2328 | ||
2329 | return len; | |
2330 | } | |
2331 | ||
2332 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2333 | int cmd) | |
2334 | { | |
2335 | struct net *net = read_pnet(&mrt->net); | |
2336 | struct sk_buff *skb; | |
2337 | int err = -ENOBUFS; | |
2338 | ||
2339 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), | |
2340 | GFP_ATOMIC); | |
51456b29 | 2341 | if (!skb) |
8cd3ac9f ND |
2342 | goto errout; |
2343 | ||
65886f43 | 2344 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2345 | if (err < 0) |
2346 | goto errout; | |
2347 | ||
2348 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2349 | return; | |
2350 | ||
2351 | errout: | |
2352 | kfree_skb(skb); | |
2353 | if (err < 0) | |
2354 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2355 | } | |
2356 | ||
cb6a4e46 PM |
2357 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2358 | { | |
2359 | struct net *net = sock_net(skb->sk); | |
2360 | struct mr_table *mrt; | |
2361 | struct mfc_cache *mfc; | |
2362 | unsigned int t = 0, s_t; | |
2363 | unsigned int h = 0, s_h; | |
2364 | unsigned int e = 0, s_e; | |
2365 | ||
2366 | s_t = cb->args[0]; | |
2367 | s_h = cb->args[1]; | |
2368 | s_e = cb->args[2]; | |
2369 | ||
a8c9486b | 2370 | rcu_read_lock(); |
cb6a4e46 PM |
2371 | ipmr_for_each_table(mrt, net) { |
2372 | if (t < s_t) | |
2373 | goto next_table; | |
2374 | if (t > s_t) | |
2375 | s_h = 0; | |
2376 | for (h = s_h; h < MFC_LINES; h++) { | |
a8c9486b | 2377 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { |
cb6a4e46 PM |
2378 | if (e < s_e) |
2379 | goto next_entry; | |
2380 | if (ipmr_fill_mroute(mrt, skb, | |
15e47304 | 2381 | NETLINK_CB(cb->skb).portid, |
cb6a4e46 | 2382 | cb->nlh->nlmsg_seq, |
65886f43 ND |
2383 | mfc, RTM_NEWROUTE, |
2384 | NLM_F_MULTI) < 0) | |
cb6a4e46 PM |
2385 | goto done; |
2386 | next_entry: | |
2387 | e++; | |
2388 | } | |
2389 | e = s_e = 0; | |
2390 | } | |
1eb99af5 ND |
2391 | spin_lock_bh(&mfc_unres_lock); |
2392 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { | |
2393 | if (e < s_e) | |
2394 | goto next_entry2; | |
2395 | if (ipmr_fill_mroute(mrt, skb, | |
2396 | NETLINK_CB(cb->skb).portid, | |
2397 | cb->nlh->nlmsg_seq, | |
65886f43 ND |
2398 | mfc, RTM_NEWROUTE, |
2399 | NLM_F_MULTI) < 0) { | |
1eb99af5 ND |
2400 | spin_unlock_bh(&mfc_unres_lock); |
2401 | goto done; | |
2402 | } | |
2403 | next_entry2: | |
2404 | e++; | |
2405 | } | |
2406 | spin_unlock_bh(&mfc_unres_lock); | |
2407 | e = s_e = 0; | |
cb6a4e46 PM |
2408 | s_h = 0; |
2409 | next_table: | |
2410 | t++; | |
2411 | } | |
2412 | done: | |
a8c9486b | 2413 | rcu_read_unlock(); |
cb6a4e46 PM |
2414 | |
2415 | cb->args[2] = e; | |
2416 | cb->args[1] = h; | |
2417 | cb->args[0] = t; | |
2418 | ||
2419 | return skb->len; | |
2420 | } | |
2421 | ||
e905a9ed | 2422 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2423 | /* |
a8cb16dd ED |
2424 | * The /proc interfaces to multicast routing : |
2425 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 LT |
2426 | */ |
2427 | struct ipmr_vif_iter { | |
f6bb4514 | 2428 | struct seq_net_private p; |
f0ad0860 | 2429 | struct mr_table *mrt; |
1da177e4 LT |
2430 | int ct; |
2431 | }; | |
2432 | ||
f6bb4514 BT |
2433 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2434 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2435 | loff_t pos) |
2436 | { | |
f0ad0860 | 2437 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2438 | |
2439 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2440 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2441 | continue; |
e905a9ed | 2442 | if (pos-- == 0) |
0c12295a | 2443 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2444 | } |
2445 | return NULL; | |
2446 | } | |
2447 | ||
2448 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2449 | __acquires(mrt_lock) |
1da177e4 | 2450 | { |
f0ad0860 | 2451 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2452 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2453 | struct mr_table *mrt; |
2454 | ||
2455 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 2456 | if (!mrt) |
f0ad0860 PM |
2457 | return ERR_PTR(-ENOENT); |
2458 | ||
2459 | iter->mrt = mrt; | |
f6bb4514 | 2460 | |
1da177e4 | 2461 | read_lock(&mrt_lock); |
f6bb4514 | 2462 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2463 | : SEQ_START_TOKEN; |
2464 | } | |
2465 | ||
2466 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2467 | { | |
2468 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2469 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2470 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2471 | |
2472 | ++*pos; | |
2473 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2474 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2475 | |
0c12295a PM |
2476 | while (++iter->ct < mrt->maxvif) { |
2477 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2478 | continue; |
0c12295a | 2479 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2480 | } |
2481 | return NULL; | |
2482 | } | |
2483 | ||
2484 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2485 | __releases(mrt_lock) |
1da177e4 LT |
2486 | { |
2487 | read_unlock(&mrt_lock); | |
2488 | } | |
2489 | ||
2490 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2491 | { | |
f0ad0860 PM |
2492 | struct ipmr_vif_iter *iter = seq->private; |
2493 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2494 | |
1da177e4 | 2495 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2496 | seq_puts(seq, |
1da177e4 LT |
2497 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2498 | } else { | |
2499 | const struct vif_device *vif = v; | |
2500 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2501 | ||
2502 | seq_printf(seq, | |
2503 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2504 | vif - mrt->vif_table, |
e905a9ed | 2505 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2506 | vif->bytes_out, vif->pkt_out, |
2507 | vif->flags, vif->local, vif->remote); | |
2508 | } | |
2509 | return 0; | |
2510 | } | |
2511 | ||
f690808e | 2512 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2513 | .start = ipmr_vif_seq_start, |
2514 | .next = ipmr_vif_seq_next, | |
2515 | .stop = ipmr_vif_seq_stop, | |
2516 | .show = ipmr_vif_seq_show, | |
2517 | }; | |
2518 | ||
2519 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2520 | { | |
f6bb4514 BT |
2521 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2522 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2523 | } |
2524 | ||
9a32144e | 2525 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2526 | .owner = THIS_MODULE, |
2527 | .open = ipmr_vif_open, | |
2528 | .read = seq_read, | |
2529 | .llseek = seq_lseek, | |
f6bb4514 | 2530 | .release = seq_release_net, |
1da177e4 LT |
2531 | }; |
2532 | ||
2533 | struct ipmr_mfc_iter { | |
f6bb4514 | 2534 | struct seq_net_private p; |
f0ad0860 | 2535 | struct mr_table *mrt; |
862465f2 | 2536 | struct list_head *cache; |
1da177e4 LT |
2537 | int ct; |
2538 | }; | |
2539 | ||
2540 | ||
f6bb4514 BT |
2541 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2542 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2543 | { |
f0ad0860 | 2544 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2545 | struct mfc_cache *mfc; |
2546 | ||
a8c9486b | 2547 | rcu_read_lock(); |
862465f2 | 2548 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2549 | it->cache = &mrt->mfc_cache_array[it->ct]; |
a8c9486b | 2550 | list_for_each_entry_rcu(mfc, it->cache, list) |
e905a9ed | 2551 | if (pos-- == 0) |
1da177e4 | 2552 | return mfc; |
862465f2 | 2553 | } |
a8c9486b | 2554 | rcu_read_unlock(); |
1da177e4 | 2555 | |
1da177e4 | 2556 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2557 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2558 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2559 | if (pos-- == 0) |
1da177e4 LT |
2560 | return mfc; |
2561 | spin_unlock_bh(&mfc_unres_lock); | |
2562 | ||
2563 | it->cache = NULL; | |
2564 | return NULL; | |
2565 | } | |
2566 | ||
2567 | ||
2568 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2569 | { | |
2570 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2571 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2572 | struct mr_table *mrt; |
f6bb4514 | 2573 | |
f0ad0860 | 2574 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2575 | if (!mrt) |
f0ad0860 | 2576 | return ERR_PTR(-ENOENT); |
f6bb4514 | 2577 | |
f0ad0860 | 2578 | it->mrt = mrt; |
1da177e4 LT |
2579 | it->cache = NULL; |
2580 | it->ct = 0; | |
f6bb4514 | 2581 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2582 | : SEQ_START_TOKEN; |
2583 | } | |
2584 | ||
2585 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2586 | { | |
2587 | struct mfc_cache *mfc = v; | |
2588 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2589 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2590 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2591 | |
2592 | ++*pos; | |
2593 | ||
2594 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2595 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2596 | |
862465f2 PM |
2597 | if (mfc->list.next != it->cache) |
2598 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2599 | |
0c12295a | 2600 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2601 | goto end_of_list; |
2602 | ||
0c12295a | 2603 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2604 | |
2605 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2606 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2607 | if (list_empty(it->cache)) |
2608 | continue; | |
2609 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2610 | } |
2611 | ||
2612 | /* exhausted cache_array, show unresolved */ | |
a8c9486b | 2613 | rcu_read_unlock(); |
0c12295a | 2614 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2615 | it->ct = 0; |
e905a9ed | 2616 | |
1da177e4 | 2617 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2618 | if (!list_empty(it->cache)) |
2619 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 | 2620 | |
a8cb16dd | 2621 | end_of_list: |
1da177e4 LT |
2622 | spin_unlock_bh(&mfc_unres_lock); |
2623 | it->cache = NULL; | |
2624 | ||
2625 | return NULL; | |
2626 | } | |
2627 | ||
2628 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2629 | { | |
2630 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2631 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2632 | |
0c12295a | 2633 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2634 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2635 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
a8c9486b | 2636 | rcu_read_unlock(); |
1da177e4 LT |
2637 | } |
2638 | ||
2639 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2640 | { | |
2641 | int n; | |
2642 | ||
2643 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2644 | seq_puts(seq, |
1da177e4 LT |
2645 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2646 | } else { | |
2647 | const struct mfc_cache *mfc = v; | |
2648 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2649 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2650 | |
0eae88f3 ED |
2651 | seq_printf(seq, "%08X %08X %-3hd", |
2652 | (__force u32) mfc->mfc_mcastgrp, | |
2653 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2654 | mfc->mfc_parent); |
1da177e4 | 2655 | |
0c12295a | 2656 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2657 | seq_printf(seq, " %8lu %8lu %8lu", |
2658 | mfc->mfc_un.res.pkt, | |
2659 | mfc->mfc_un.res.bytes, | |
2660 | mfc->mfc_un.res.wrong_if); | |
132adf54 | 2661 | for (n = mfc->mfc_un.res.minvif; |
a8cb16dd | 2662 | n < mfc->mfc_un.res.maxvif; n++) { |
0c12295a | 2663 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2664 | mfc->mfc_un.res.ttls[n] < 255) |
2665 | seq_printf(seq, | |
e905a9ed | 2666 | " %2d:%-3d", |
1da177e4 LT |
2667 | n, mfc->mfc_un.res.ttls[n]); |
2668 | } | |
1ea472e2 BT |
2669 | } else { |
2670 | /* unresolved mfc_caches don't contain | |
2671 | * pkt, bytes and wrong_if values | |
2672 | */ | |
2673 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2674 | } |
2675 | seq_putc(seq, '\n'); | |
2676 | } | |
2677 | return 0; | |
2678 | } | |
2679 | ||
f690808e | 2680 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2681 | .start = ipmr_mfc_seq_start, |
2682 | .next = ipmr_mfc_seq_next, | |
2683 | .stop = ipmr_mfc_seq_stop, | |
2684 | .show = ipmr_mfc_seq_show, | |
2685 | }; | |
2686 | ||
2687 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2688 | { | |
f6bb4514 BT |
2689 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2690 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2691 | } |
2692 | ||
9a32144e | 2693 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2694 | .owner = THIS_MODULE, |
2695 | .open = ipmr_mfc_open, | |
2696 | .read = seq_read, | |
2697 | .llseek = seq_lseek, | |
f6bb4514 | 2698 | .release = seq_release_net, |
1da177e4 | 2699 | }; |
e905a9ed | 2700 | #endif |
1da177e4 LT |
2701 | |
2702 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2703 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2704 | .handler = pim_rcv, |
403dbb97 | 2705 | .netns_ok = 1, |
1da177e4 LT |
2706 | }; |
2707 | #endif | |
2708 | ||
2709 | ||
2710 | /* | |
2711 | * Setup for IP multicast routing | |
2712 | */ | |
cf958ae3 BT |
2713 | static int __net_init ipmr_net_init(struct net *net) |
2714 | { | |
f0ad0860 | 2715 | int err; |
cf958ae3 | 2716 | |
f0ad0860 PM |
2717 | err = ipmr_rules_init(net); |
2718 | if (err < 0) | |
cf958ae3 | 2719 | goto fail; |
f6bb4514 BT |
2720 | |
2721 | #ifdef CONFIG_PROC_FS | |
2722 | err = -ENOMEM; | |
d4beaa66 | 2723 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 2724 | goto proc_vif_fail; |
d4beaa66 | 2725 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
2726 | goto proc_cache_fail; |
2727 | #endif | |
2bb8b26c BT |
2728 | return 0; |
2729 | ||
f6bb4514 BT |
2730 | #ifdef CONFIG_PROC_FS |
2731 | proc_cache_fail: | |
ece31ffd | 2732 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 2733 | proc_vif_fail: |
f0ad0860 | 2734 | ipmr_rules_exit(net); |
f6bb4514 | 2735 | #endif |
cf958ae3 BT |
2736 | fail: |
2737 | return err; | |
2738 | } | |
2739 | ||
2740 | static void __net_exit ipmr_net_exit(struct net *net) | |
2741 | { | |
f6bb4514 | 2742 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
2743 | remove_proc_entry("ip_mr_cache", net->proc_net); |
2744 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 2745 | #endif |
f0ad0860 | 2746 | ipmr_rules_exit(net); |
cf958ae3 BT |
2747 | } |
2748 | ||
2749 | static struct pernet_operations ipmr_net_ops = { | |
2750 | .init = ipmr_net_init, | |
2751 | .exit = ipmr_net_exit, | |
2752 | }; | |
e905a9ed | 2753 | |
03d2f897 | 2754 | int __init ip_mr_init(void) |
1da177e4 | 2755 | { |
03d2f897 WC |
2756 | int err; |
2757 | ||
1da177e4 LT |
2758 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2759 | sizeof(struct mfc_cache), | |
a8c9486b | 2760 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 2761 | NULL); |
03d2f897 WC |
2762 | if (!mrt_cachep) |
2763 | return -ENOMEM; | |
2764 | ||
cf958ae3 BT |
2765 | err = register_pernet_subsys(&ipmr_net_ops); |
2766 | if (err) | |
2767 | goto reg_pernet_fail; | |
2768 | ||
03d2f897 WC |
2769 | err = register_netdevice_notifier(&ip_mr_notifier); |
2770 | if (err) | |
2771 | goto reg_notif_fail; | |
403dbb97 TG |
2772 | #ifdef CONFIG_IP_PIMSM_V2 |
2773 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 2774 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
2775 | err = -EAGAIN; |
2776 | goto add_proto_fail; | |
2777 | } | |
2778 | #endif | |
c7ac8679 GR |
2779 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
2780 | NULL, ipmr_rtm_dumproute, NULL); | |
03d2f897 | 2781 | return 0; |
f6bb4514 | 2782 | |
403dbb97 TG |
2783 | #ifdef CONFIG_IP_PIMSM_V2 |
2784 | add_proto_fail: | |
2785 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2786 | #endif | |
c3e38896 | 2787 | reg_notif_fail: |
cf958ae3 BT |
2788 | unregister_pernet_subsys(&ipmr_net_ops); |
2789 | reg_pernet_fail: | |
c3e38896 | 2790 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2791 | return err; |
1da177e4 | 2792 | } |