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 | 87 | int mroute_reg_vif_num; |
0c12295a PM |
88 | }; |
89 | ||
f0ad0860 PM |
90 | struct ipmr_rule { |
91 | struct fib_rule common; | |
92 | }; | |
93 | ||
94 | struct ipmr_result { | |
95 | struct mr_table *mrt; | |
96 | }; | |
97 | ||
1da177e4 | 98 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 99 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
100 | */ |
101 | ||
102 | static DEFINE_RWLOCK(mrt_lock); | |
103 | ||
104 | /* | |
105 | * Multicast router control variables | |
106 | */ | |
107 | ||
0c12295a | 108 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 LT |
109 | |
110 | /* Special spinlock for queue of unresolved entries */ | |
111 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
112 | ||
113 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
114 | * entries is changed only in process context and protected |
115 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
116 | * with strong spinlock mfc_unres_lock. | |
117 | * | |
118 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
119 | */ |
120 | ||
e18b890b | 121 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 122 | |
f0ad0860 | 123 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
124 | static void ipmr_free_table(struct mr_table *mrt); |
125 | ||
c4854ec8 RR |
126 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
127 | struct sk_buff *skb, struct mfc_cache *cache, | |
128 | int local); | |
0c12295a | 129 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 130 | struct sk_buff *pkt, vifi_t vifi, int assert); |
cb6a4e46 PM |
131 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
132 | struct mfc_cache *c, struct rtmsg *rtm); | |
8cd3ac9f ND |
133 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
134 | int cmd); | |
acbb219d | 135 | static void mroute_clean_tables(struct mr_table *mrt); |
f0ad0860 PM |
136 | static void ipmr_expire_process(unsigned long arg); |
137 | ||
138 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
139 | #define ipmr_for_each_table(mrt, net) \ | |
140 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
141 | ||
142 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
143 | { | |
144 | struct mr_table *mrt; | |
145 | ||
146 | ipmr_for_each_table(mrt, net) { | |
147 | if (mrt->id == id) | |
148 | return mrt; | |
149 | } | |
150 | return NULL; | |
151 | } | |
152 | ||
da91981b | 153 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
154 | struct mr_table **mrt) |
155 | { | |
f0ad0860 | 156 | int err; |
95f4a45d HFS |
157 | struct ipmr_result res; |
158 | struct fib_lookup_arg arg = { | |
159 | .result = &res, | |
160 | .flags = FIB_LOOKUP_NOREF, | |
161 | }; | |
f0ad0860 | 162 | |
da91981b DM |
163 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
164 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
165 | if (err < 0) |
166 | return err; | |
167 | *mrt = res.mrt; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
172 | int flags, struct fib_lookup_arg *arg) | |
173 | { | |
174 | struct ipmr_result *res = arg->result; | |
175 | struct mr_table *mrt; | |
1da177e4 | 176 | |
f0ad0860 PM |
177 | switch (rule->action) { |
178 | case FR_ACT_TO_TBL: | |
179 | break; | |
180 | case FR_ACT_UNREACHABLE: | |
181 | return -ENETUNREACH; | |
182 | case FR_ACT_PROHIBIT: | |
183 | return -EACCES; | |
184 | case FR_ACT_BLACKHOLE: | |
185 | default: | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
51456b29 | 190 | if (!mrt) |
f0ad0860 PM |
191 | return -EAGAIN; |
192 | res->mrt = mrt; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
197 | { | |
198 | return 1; | |
199 | } | |
200 | ||
201 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
202 | FRA_GENERIC_POLICY, | |
203 | }; | |
204 | ||
205 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
206 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
207 | { | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
212 | struct nlattr **tb) | |
213 | { | |
214 | return 1; | |
215 | } | |
216 | ||
217 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
218 | struct fib_rule_hdr *frh) | |
219 | { | |
220 | frh->dst_len = 0; | |
221 | frh->src_len = 0; | |
222 | frh->tos = 0; | |
223 | return 0; | |
224 | } | |
225 | ||
04a6f82c | 226 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 227 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
228 | .rule_size = sizeof(struct ipmr_rule), |
229 | .addr_size = sizeof(u32), | |
230 | .action = ipmr_rule_action, | |
231 | .match = ipmr_rule_match, | |
232 | .configure = ipmr_rule_configure, | |
233 | .compare = ipmr_rule_compare, | |
f0ad0860 PM |
234 | .fill = ipmr_rule_fill, |
235 | .nlgroup = RTNLGRP_IPV4_RULE, | |
236 | .policy = ipmr_rule_policy, | |
237 | .owner = THIS_MODULE, | |
238 | }; | |
239 | ||
240 | static int __net_init ipmr_rules_init(struct net *net) | |
241 | { | |
242 | struct fib_rules_ops *ops; | |
243 | struct mr_table *mrt; | |
244 | int err; | |
245 | ||
246 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
247 | if (IS_ERR(ops)) | |
248 | return PTR_ERR(ops); | |
249 | ||
250 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
251 | ||
252 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
1113ebbc NA |
253 | if (IS_ERR(mrt)) { |
254 | err = PTR_ERR(mrt); | |
f0ad0860 PM |
255 | goto err1; |
256 | } | |
257 | ||
258 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
259 | if (err < 0) | |
260 | goto err2; | |
261 | ||
262 | net->ipv4.mr_rules_ops = ops; | |
263 | return 0; | |
264 | ||
265 | err2: | |
f243e5a7 | 266 | ipmr_free_table(mrt); |
f0ad0860 PM |
267 | err1: |
268 | fib_rules_unregister(ops); | |
269 | return err; | |
270 | } | |
271 | ||
272 | static void __net_exit ipmr_rules_exit(struct net *net) | |
273 | { | |
274 | struct mr_table *mrt, *next; | |
275 | ||
ed785309 | 276 | rtnl_lock(); |
035320d5 ED |
277 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
278 | list_del(&mrt->list); | |
acbb219d | 279 | ipmr_free_table(mrt); |
035320d5 | 280 | } |
f0ad0860 | 281 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
419df12f | 282 | rtnl_unlock(); |
f0ad0860 PM |
283 | } |
284 | #else | |
285 | #define ipmr_for_each_table(mrt, net) \ | |
286 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
287 | ||
288 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
289 | { | |
290 | return net->ipv4.mrt; | |
291 | } | |
292 | ||
da91981b | 293 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
294 | struct mr_table **mrt) |
295 | { | |
296 | *mrt = net->ipv4.mrt; | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int __net_init ipmr_rules_init(struct net *net) | |
301 | { | |
1113ebbc NA |
302 | struct mr_table *mrt; |
303 | ||
304 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
305 | if (IS_ERR(mrt)) | |
306 | return PTR_ERR(mrt); | |
307 | net->ipv4.mrt = mrt; | |
308 | return 0; | |
f0ad0860 PM |
309 | } |
310 | ||
311 | static void __net_exit ipmr_rules_exit(struct net *net) | |
312 | { | |
ed785309 | 313 | rtnl_lock(); |
acbb219d | 314 | ipmr_free_table(net->ipv4.mrt); |
ed785309 WC |
315 | net->ipv4.mrt = NULL; |
316 | rtnl_unlock(); | |
f0ad0860 PM |
317 | } |
318 | #endif | |
319 | ||
320 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
321 | { | |
322 | struct mr_table *mrt; | |
323 | unsigned int i; | |
1da177e4 | 324 | |
1113ebbc NA |
325 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
326 | if (id != RT_TABLE_DEFAULT && id >= 1000000000) | |
327 | return ERR_PTR(-EINVAL); | |
328 | ||
f0ad0860 | 329 | mrt = ipmr_get_table(net, id); |
00db4124 | 330 | if (mrt) |
f0ad0860 PM |
331 | return mrt; |
332 | ||
333 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
51456b29 | 334 | if (!mrt) |
1113ebbc | 335 | return ERR_PTR(-ENOMEM); |
8de53dfb | 336 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
337 | mrt->id = id; |
338 | ||
339 | /* Forwarding cache */ | |
340 | for (i = 0; i < MFC_LINES; i++) | |
341 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
342 | ||
343 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
344 | ||
345 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
346 | (unsigned long)mrt); | |
347 | ||
f0ad0860 | 348 | mrt->mroute_reg_vif_num = -1; |
f0ad0860 PM |
349 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES |
350 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
351 | #endif | |
352 | return mrt; | |
353 | } | |
1da177e4 | 354 | |
acbb219d FR |
355 | static void ipmr_free_table(struct mr_table *mrt) |
356 | { | |
357 | del_timer_sync(&mrt->ipmr_expire_timer); | |
358 | mroute_clean_tables(mrt); | |
359 | kfree(mrt); | |
360 | } | |
361 | ||
1da177e4 LT |
362 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
363 | ||
d607032d WC |
364 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
365 | { | |
4feb88e5 BT |
366 | struct net *net = dev_net(dev); |
367 | ||
d607032d WC |
368 | dev_close(dev); |
369 | ||
4feb88e5 | 370 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 371 | if (dev) { |
5bc3eb7e | 372 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 373 | struct ifreq ifr; |
d607032d WC |
374 | struct ip_tunnel_parm p; |
375 | ||
376 | memset(&p, 0, sizeof(p)); | |
377 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
378 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
379 | p.iph.version = 4; | |
380 | p.iph.ihl = 5; | |
381 | p.iph.protocol = IPPROTO_IPIP; | |
382 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
383 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
384 | ||
5bc3eb7e SH |
385 | if (ops->ndo_do_ioctl) { |
386 | mm_segment_t oldfs = get_fs(); | |
387 | ||
388 | set_fs(KERNEL_DS); | |
389 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
390 | set_fs(oldfs); | |
391 | } | |
d607032d WC |
392 | } |
393 | } | |
394 | ||
1da177e4 | 395 | static |
4feb88e5 | 396 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
397 | { |
398 | struct net_device *dev; | |
399 | ||
4feb88e5 | 400 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
401 | |
402 | if (dev) { | |
5bc3eb7e | 403 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
404 | int err; |
405 | struct ifreq ifr; | |
1da177e4 LT |
406 | struct ip_tunnel_parm p; |
407 | struct in_device *in_dev; | |
408 | ||
409 | memset(&p, 0, sizeof(p)); | |
410 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
411 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
412 | p.iph.version = 4; | |
413 | p.iph.ihl = 5; | |
414 | p.iph.protocol = IPPROTO_IPIP; | |
415 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 416 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 417 | |
5bc3eb7e SH |
418 | if (ops->ndo_do_ioctl) { |
419 | mm_segment_t oldfs = get_fs(); | |
420 | ||
421 | set_fs(KERNEL_DS); | |
422 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
423 | set_fs(oldfs); | |
a8cb16dd | 424 | } else { |
5bc3eb7e | 425 | err = -EOPNOTSUPP; |
a8cb16dd | 426 | } |
1da177e4 LT |
427 | dev = NULL; |
428 | ||
4feb88e5 BT |
429 | if (err == 0 && |
430 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
431 | dev->flags |= IFF_MULTICAST; |
432 | ||
e5ed6399 | 433 | in_dev = __in_dev_get_rtnl(dev); |
51456b29 | 434 | if (!in_dev) |
1da177e4 | 435 | goto failure; |
71e27da9 HX |
436 | |
437 | ipv4_devconf_setall(in_dev); | |
1d4c8c29 | 438 | neigh_parms_data_state_setall(in_dev->arp_parms); |
71e27da9 | 439 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
1da177e4 LT |
440 | |
441 | if (dev_open(dev)) | |
442 | goto failure; | |
7dc00c82 | 443 | dev_hold(dev); |
1da177e4 LT |
444 | } |
445 | } | |
446 | return dev; | |
447 | ||
448 | failure: | |
449 | /* allow the register to be completed before unregistering. */ | |
450 | rtnl_unlock(); | |
451 | rtnl_lock(); | |
452 | ||
453 | unregister_netdevice(dev); | |
454 | return NULL; | |
455 | } | |
456 | ||
457 | #ifdef CONFIG_IP_PIMSM | |
458 | ||
6fef4c0c | 459 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 460 | { |
4feb88e5 | 461 | struct net *net = dev_net(dev); |
f0ad0860 | 462 | struct mr_table *mrt; |
da91981b DM |
463 | struct flowi4 fl4 = { |
464 | .flowi4_oif = dev->ifindex, | |
6a662719 | 465 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
da91981b | 466 | .flowi4_mark = skb->mark, |
f0ad0860 PM |
467 | }; |
468 | int err; | |
469 | ||
da91981b | 470 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
471 | if (err < 0) { |
472 | kfree_skb(skb); | |
f0ad0860 | 473 | return err; |
e40dbc51 | 474 | } |
4feb88e5 | 475 | |
1da177e4 | 476 | read_lock(&mrt_lock); |
cf3677ae PE |
477 | dev->stats.tx_bytes += skb->len; |
478 | dev->stats.tx_packets++; | |
0c12295a | 479 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
480 | read_unlock(&mrt_lock); |
481 | kfree_skb(skb); | |
6ed10654 | 482 | return NETDEV_TX_OK; |
1da177e4 LT |
483 | } |
484 | ||
ee9b9596 ND |
485 | static int reg_vif_get_iflink(const struct net_device *dev) |
486 | { | |
487 | return 0; | |
488 | } | |
489 | ||
007c3838 SH |
490 | static const struct net_device_ops reg_vif_netdev_ops = { |
491 | .ndo_start_xmit = reg_vif_xmit, | |
ee9b9596 | 492 | .ndo_get_iflink = reg_vif_get_iflink, |
007c3838 SH |
493 | }; |
494 | ||
1da177e4 LT |
495 | static void reg_vif_setup(struct net_device *dev) |
496 | { | |
497 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 498 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 499 | dev->flags = IFF_NOARP; |
70cb4a45 | 500 | dev->netdev_ops = ®_vif_netdev_ops; |
1da177e4 | 501 | dev->destructor = free_netdev; |
403dbb97 | 502 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
503 | } |
504 | ||
f0ad0860 | 505 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
506 | { |
507 | struct net_device *dev; | |
508 | struct in_device *in_dev; | |
f0ad0860 | 509 | char name[IFNAMSIZ]; |
1da177e4 | 510 | |
f0ad0860 PM |
511 | if (mrt->id == RT_TABLE_DEFAULT) |
512 | sprintf(name, "pimreg"); | |
513 | else | |
514 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 515 | |
c835a677 | 516 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
1da177e4 | 517 | |
51456b29 | 518 | if (!dev) |
1da177e4 LT |
519 | return NULL; |
520 | ||
403dbb97 TG |
521 | dev_net_set(dev, net); |
522 | ||
1da177e4 LT |
523 | if (register_netdevice(dev)) { |
524 | free_netdev(dev); | |
525 | return NULL; | |
526 | } | |
1da177e4 | 527 | |
71e27da9 | 528 | rcu_read_lock(); |
a8cb16dd ED |
529 | in_dev = __in_dev_get_rcu(dev); |
530 | if (!in_dev) { | |
71e27da9 | 531 | rcu_read_unlock(); |
1da177e4 | 532 | goto failure; |
71e27da9 | 533 | } |
1da177e4 | 534 | |
71e27da9 | 535 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 536 | neigh_parms_data_state_setall(in_dev->arp_parms); |
71e27da9 HX |
537 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
538 | rcu_read_unlock(); | |
1da177e4 LT |
539 | |
540 | if (dev_open(dev)) | |
541 | goto failure; | |
542 | ||
7dc00c82 WC |
543 | dev_hold(dev); |
544 | ||
1da177e4 LT |
545 | return dev; |
546 | ||
547 | failure: | |
548 | /* allow the register to be completed before unregistering. */ | |
549 | rtnl_unlock(); | |
550 | rtnl_lock(); | |
551 | ||
552 | unregister_netdevice(dev); | |
553 | return NULL; | |
554 | } | |
555 | #endif | |
556 | ||
2c53040f BH |
557 | /** |
558 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 559 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 560 | */ |
e905a9ed | 561 | |
0c12295a | 562 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 563 | struct list_head *head) |
1da177e4 LT |
564 | { |
565 | struct vif_device *v; | |
566 | struct net_device *dev; | |
567 | struct in_device *in_dev; | |
568 | ||
0c12295a | 569 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
570 | return -EADDRNOTAVAIL; |
571 | ||
0c12295a | 572 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
573 | |
574 | write_lock_bh(&mrt_lock); | |
575 | dev = v->dev; | |
576 | v->dev = NULL; | |
577 | ||
578 | if (!dev) { | |
579 | write_unlock_bh(&mrt_lock); | |
580 | return -EADDRNOTAVAIL; | |
581 | } | |
582 | ||
0c12295a PM |
583 | if (vifi == mrt->mroute_reg_vif_num) |
584 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 | 585 | |
a8cb16dd | 586 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 587 | int tmp; |
a8cb16dd ED |
588 | |
589 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 590 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
591 | break; |
592 | } | |
0c12295a | 593 | mrt->maxvif = tmp+1; |
1da177e4 LT |
594 | } |
595 | ||
596 | write_unlock_bh(&mrt_lock); | |
597 | ||
598 | dev_set_allmulti(dev, -1); | |
599 | ||
a8cb16dd ED |
600 | in_dev = __in_dev_get_rtnl(dev); |
601 | if (in_dev) { | |
42f811b8 | 602 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
d67b8c61 ND |
603 | inet_netconf_notify_devconf(dev_net(dev), |
604 | NETCONFA_MC_FORWARDING, | |
605 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
606 | ip_rt_multicast_event(in_dev); |
607 | } | |
608 | ||
a8cb16dd | 609 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 610 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
611 | |
612 | dev_put(dev); | |
613 | return 0; | |
614 | } | |
615 | ||
a8c9486b | 616 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 617 | { |
a8c9486b ED |
618 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
619 | ||
5c0a66f5 BT |
620 | kmem_cache_free(mrt_cachep, c); |
621 | } | |
622 | ||
a8c9486b ED |
623 | static inline void ipmr_cache_free(struct mfc_cache *c) |
624 | { | |
625 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
626 | } | |
627 | ||
1da177e4 | 628 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 629 | * and reporting error to netlink readers. |
1da177e4 LT |
630 | */ |
631 | ||
0c12295a | 632 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 633 | { |
8de53dfb | 634 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 635 | struct sk_buff *skb; |
9ef1d4c7 | 636 | struct nlmsgerr *e; |
1da177e4 | 637 | |
0c12295a | 638 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 639 | |
c354e124 | 640 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 641 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
642 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
643 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 644 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 645 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 646 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
647 | e->error = -ETIMEDOUT; |
648 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 649 | |
15e47304 | 650 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 651 | } else { |
1da177e4 | 652 | kfree_skb(skb); |
a8cb16dd | 653 | } |
1da177e4 LT |
654 | } |
655 | ||
5c0a66f5 | 656 | ipmr_cache_free(c); |
1da177e4 LT |
657 | } |
658 | ||
659 | ||
e258beb2 | 660 | /* Timer process for the unresolved queue. */ |
1da177e4 | 661 | |
e258beb2 | 662 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 663 | { |
0c12295a | 664 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
665 | unsigned long now; |
666 | unsigned long expires; | |
862465f2 | 667 | struct mfc_cache *c, *next; |
1da177e4 LT |
668 | |
669 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 670 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
671 | return; |
672 | } | |
673 | ||
0c12295a | 674 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
675 | goto out; |
676 | ||
677 | now = jiffies; | |
678 | expires = 10*HZ; | |
1da177e4 | 679 | |
0c12295a | 680 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
681 | if (time_after(c->mfc_un.unres.expires, now)) { |
682 | unsigned long interval = c->mfc_un.unres.expires - now; | |
683 | if (interval < expires) | |
684 | expires = interval; | |
1da177e4 LT |
685 | continue; |
686 | } | |
687 | ||
862465f2 | 688 | list_del(&c->list); |
8cd3ac9f | 689 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 690 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
691 | } |
692 | ||
0c12295a PM |
693 | if (!list_empty(&mrt->mfc_unres_queue)) |
694 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
695 | |
696 | out: | |
697 | spin_unlock(&mfc_unres_lock); | |
698 | } | |
699 | ||
700 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
701 | ||
0c12295a | 702 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 703 | unsigned char *ttls) |
1da177e4 LT |
704 | { |
705 | int vifi; | |
706 | ||
707 | cache->mfc_un.res.minvif = MAXVIFS; | |
708 | cache->mfc_un.res.maxvif = 0; | |
709 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
710 | ||
0c12295a PM |
711 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
712 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 713 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
714 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
715 | if (cache->mfc_un.res.minvif > vifi) | |
716 | cache->mfc_un.res.minvif = vifi; | |
717 | if (cache->mfc_un.res.maxvif <= vifi) | |
718 | cache->mfc_un.res.maxvif = vifi + 1; | |
719 | } | |
720 | } | |
721 | } | |
722 | ||
0c12295a PM |
723 | static int vif_add(struct net *net, struct mr_table *mrt, |
724 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
725 | { |
726 | int vifi = vifc->vifc_vifi; | |
0c12295a | 727 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
728 | struct net_device *dev; |
729 | struct in_device *in_dev; | |
d607032d | 730 | int err; |
1da177e4 LT |
731 | |
732 | /* Is vif busy ? */ | |
0c12295a | 733 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
734 | return -EADDRINUSE; |
735 | ||
736 | switch (vifc->vifc_flags) { | |
737 | #ifdef CONFIG_IP_PIMSM | |
738 | case VIFF_REGISTER: | |
739 | /* | |
740 | * Special Purpose VIF in PIM | |
741 | * All the packets will be sent to the daemon | |
742 | */ | |
0c12295a | 743 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 744 | return -EADDRINUSE; |
f0ad0860 | 745 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
746 | if (!dev) |
747 | return -ENOBUFS; | |
d607032d WC |
748 | err = dev_set_allmulti(dev, 1); |
749 | if (err) { | |
750 | unregister_netdevice(dev); | |
7dc00c82 | 751 | dev_put(dev); |
d607032d WC |
752 | return err; |
753 | } | |
1da177e4 LT |
754 | break; |
755 | #endif | |
e905a9ed | 756 | case VIFF_TUNNEL: |
4feb88e5 | 757 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
758 | if (!dev) |
759 | return -ENOBUFS; | |
d607032d WC |
760 | err = dev_set_allmulti(dev, 1); |
761 | if (err) { | |
762 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 763 | dev_put(dev); |
d607032d WC |
764 | return err; |
765 | } | |
1da177e4 | 766 | break; |
ee5e81f0 I |
767 | |
768 | case VIFF_USE_IFINDEX: | |
1da177e4 | 769 | case 0: |
ee5e81f0 I |
770 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
771 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
51456b29 | 772 | if (dev && !__in_dev_get_rtnl(dev)) { |
ee5e81f0 I |
773 | dev_put(dev); |
774 | return -EADDRNOTAVAIL; | |
775 | } | |
a8cb16dd | 776 | } else { |
ee5e81f0 | 777 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 778 | } |
1da177e4 LT |
779 | if (!dev) |
780 | return -EADDRNOTAVAIL; | |
d607032d | 781 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
782 | if (err) { |
783 | dev_put(dev); | |
d607032d | 784 | return err; |
7dc00c82 | 785 | } |
1da177e4 LT |
786 | break; |
787 | default: | |
788 | return -EINVAL; | |
789 | } | |
790 | ||
a8cb16dd ED |
791 | in_dev = __in_dev_get_rtnl(dev); |
792 | if (!in_dev) { | |
d0490cfd | 793 | dev_put(dev); |
1da177e4 | 794 | return -EADDRNOTAVAIL; |
d0490cfd | 795 | } |
42f811b8 | 796 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
d67b8c61 ND |
797 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex, |
798 | &in_dev->cnf); | |
1da177e4 LT |
799 | ip_rt_multicast_event(in_dev); |
800 | ||
a8cb16dd ED |
801 | /* Fill in the VIF structures */ |
802 | ||
c354e124 JK |
803 | v->rate_limit = vifc->vifc_rate_limit; |
804 | v->local = vifc->vifc_lcl_addr.s_addr; | |
805 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
806 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
807 | if (!mrtsock) |
808 | v->flags |= VIFF_STATIC; | |
c354e124 | 809 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
810 | v->bytes_in = 0; |
811 | v->bytes_out = 0; | |
812 | v->pkt_in = 0; | |
813 | v->pkt_out = 0; | |
814 | v->link = dev->ifindex; | |
a8cb16dd | 815 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
a54acb3a | 816 | v->link = dev_get_iflink(dev); |
1da177e4 LT |
817 | |
818 | /* And finish update writing critical data */ | |
819 | write_lock_bh(&mrt_lock); | |
c354e124 | 820 | v->dev = dev; |
a8cb16dd | 821 | if (v->flags & VIFF_REGISTER) |
0c12295a | 822 | mrt->mroute_reg_vif_num = vifi; |
0c12295a PM |
823 | if (vifi+1 > mrt->maxvif) |
824 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
825 | write_unlock_bh(&mrt_lock); |
826 | return 0; | |
827 | } | |
828 | ||
a8c9486b | 829 | /* called with rcu_read_lock() */ |
0c12295a | 830 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
831 | __be32 origin, |
832 | __be32 mcastgrp) | |
1da177e4 | 833 | { |
c354e124 | 834 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
835 | struct mfc_cache *c; |
836 | ||
a8c9486b | 837 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
838 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
839 | return c; | |
1da177e4 | 840 | } |
862465f2 | 841 | return NULL; |
1da177e4 LT |
842 | } |
843 | ||
660b26dc ND |
844 | /* Look for a (*,*,oif) entry */ |
845 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, | |
846 | int vifi) | |
847 | { | |
360eb5da | 848 | int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY)); |
660b26dc ND |
849 | struct mfc_cache *c; |
850 | ||
851 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da ND |
852 | if (c->mfc_origin == htonl(INADDR_ANY) && |
853 | c->mfc_mcastgrp == htonl(INADDR_ANY) && | |
660b26dc ND |
854 | c->mfc_un.res.ttls[vifi] < 255) |
855 | return c; | |
856 | ||
857 | return NULL; | |
858 | } | |
859 | ||
860 | /* Look for a (*,G) entry */ | |
861 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
862 | __be32 mcastgrp, int vifi) | |
863 | { | |
360eb5da | 864 | int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY)); |
660b26dc ND |
865 | struct mfc_cache *c, *proxy; |
866 | ||
360eb5da | 867 | if (mcastgrp == htonl(INADDR_ANY)) |
660b26dc ND |
868 | goto skip; |
869 | ||
870 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da | 871 | if (c->mfc_origin == htonl(INADDR_ANY) && |
660b26dc ND |
872 | c->mfc_mcastgrp == mcastgrp) { |
873 | if (c->mfc_un.res.ttls[vifi] < 255) | |
874 | return c; | |
875 | ||
876 | /* It's ok if the vifi is part of the static tree */ | |
877 | proxy = ipmr_cache_find_any_parent(mrt, | |
878 | c->mfc_parent); | |
879 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) | |
880 | return c; | |
881 | } | |
882 | ||
883 | skip: | |
884 | return ipmr_cache_find_any_parent(mrt, vifi); | |
885 | } | |
886 | ||
1da177e4 LT |
887 | /* |
888 | * Allocate a multicast cache entry | |
889 | */ | |
d658f8a0 | 890 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 891 | { |
c354e124 | 892 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b ED |
893 | |
894 | if (c) | |
895 | c->mfc_un.res.minvif = MAXVIFS; | |
1da177e4 LT |
896 | return c; |
897 | } | |
898 | ||
d658f8a0 | 899 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 900 | { |
c354e124 | 901 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
902 | |
903 | if (c) { | |
904 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
905 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
906 | } | |
1da177e4 LT |
907 | return c; |
908 | } | |
909 | ||
910 | /* | |
911 | * A cache entry has gone into a resolved state from queued | |
912 | */ | |
e905a9ed | 913 | |
0c12295a PM |
914 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
915 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
916 | { |
917 | struct sk_buff *skb; | |
9ef1d4c7 | 918 | struct nlmsgerr *e; |
1da177e4 | 919 | |
a8cb16dd | 920 | /* Play the pending entries through our router */ |
1da177e4 | 921 | |
c354e124 | 922 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 923 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
924 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
925 | ||
573ce260 | 926 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
a8cb16dd ED |
927 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
928 | (u8 *)nlh; | |
1da177e4 LT |
929 | } else { |
930 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 931 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 932 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 933 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
934 | e->error = -EMSGSIZE; |
935 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 936 | } |
2942e900 | 937 | |
15e47304 | 938 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 939 | } else { |
0c12295a | 940 | ip_mr_forward(net, mrt, skb, c, 0); |
a8cb16dd | 941 | } |
1da177e4 LT |
942 | } |
943 | } | |
944 | ||
945 | /* | |
946 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
947 | * expects the following bizarre scheme. | |
948 | * | |
949 | * Called under mrt_lock. | |
950 | */ | |
e905a9ed | 951 | |
0c12295a | 952 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 953 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
954 | { |
955 | struct sk_buff *skb; | |
c9bdd4b5 | 956 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
957 | struct igmphdr *igmp; |
958 | struct igmpmsg *msg; | |
4c968709 | 959 | struct sock *mroute_sk; |
1da177e4 LT |
960 | int ret; |
961 | ||
962 | #ifdef CONFIG_IP_PIMSM | |
963 | if (assert == IGMPMSG_WHOLEPKT) | |
964 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
965 | else | |
966 | #endif | |
967 | skb = alloc_skb(128, GFP_ATOMIC); | |
968 | ||
132adf54 | 969 | if (!skb) |
1da177e4 LT |
970 | return -ENOBUFS; |
971 | ||
972 | #ifdef CONFIG_IP_PIMSM | |
973 | if (assert == IGMPMSG_WHOLEPKT) { | |
974 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
975 | * Duplicate old header, fix ihl, length etc. |
976 | * And all this only to mangle msg->im_msgtype and | |
977 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 978 | */ |
878c8145 ACM |
979 | skb_push(skb, sizeof(struct iphdr)); |
980 | skb_reset_network_header(skb); | |
badff6d0 | 981 | skb_reset_transport_header(skb); |
0272ffc4 | 982 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 983 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
984 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
985 | msg->im_mbz = 0; | |
0c12295a | 986 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
987 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
988 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
989 | sizeof(struct iphdr)); | |
e905a9ed | 990 | } else |
1da177e4 | 991 | #endif |
e905a9ed YH |
992 | { |
993 | ||
a8cb16dd | 994 | /* Copy the IP header */ |
1da177e4 | 995 | |
30f3a40f | 996 | skb_set_network_header(skb, skb->len); |
ddc7b8e3 | 997 | skb_put(skb, ihl); |
27d7ff46 | 998 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
a8cb16dd | 999 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
eddc9ec5 | 1000 | msg = (struct igmpmsg *)skb_network_header(skb); |
1da177e4 | 1001 | msg->im_vif = vifi; |
adf30907 | 1002 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 | 1003 | |
a8cb16dd | 1004 | /* Add our header */ |
1da177e4 | 1005 | |
a8cb16dd | 1006 | igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
1007 | igmp->type = |
1008 | msg->im_msgtype = assert; | |
a8cb16dd ED |
1009 | igmp->code = 0; |
1010 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
b0e380b1 | 1011 | skb->transport_header = skb->network_header; |
e905a9ed | 1012 | } |
1da177e4 | 1013 | |
4c968709 ED |
1014 | rcu_read_lock(); |
1015 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
51456b29 | 1016 | if (!mroute_sk) { |
4c968709 | 1017 | rcu_read_unlock(); |
1da177e4 LT |
1018 | kfree_skb(skb); |
1019 | return -EINVAL; | |
1020 | } | |
1021 | ||
a8cb16dd ED |
1022 | /* Deliver to mrouted */ |
1023 | ||
4c968709 ED |
1024 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1025 | rcu_read_unlock(); | |
70a269e6 | 1026 | if (ret < 0) { |
e87cc472 | 1027 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1028 | kfree_skb(skb); |
1029 | } | |
1030 | ||
1031 | return ret; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Queue a packet for resolution. It gets locked cache entry! | |
1036 | */ | |
e905a9ed | 1037 | |
1da177e4 | 1038 | static int |
0c12295a | 1039 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 1040 | { |
862465f2 | 1041 | bool found = false; |
1da177e4 LT |
1042 | int err; |
1043 | struct mfc_cache *c; | |
eddc9ec5 | 1044 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1045 | |
1046 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1047 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1048 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1049 | c->mfc_origin == iph->saddr) { |
1050 | found = true; | |
1da177e4 | 1051 | break; |
862465f2 | 1052 | } |
1da177e4 LT |
1053 | } |
1054 | ||
862465f2 | 1055 | if (!found) { |
a8cb16dd | 1056 | /* Create a new entry if allowable */ |
1da177e4 | 1057 | |
0c12295a | 1058 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1059 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1060 | spin_unlock_bh(&mfc_unres_lock); |
1061 | ||
1062 | kfree_skb(skb); | |
1063 | return -ENOBUFS; | |
1064 | } | |
1065 | ||
a8cb16dd ED |
1066 | /* Fill in the new cache entry */ |
1067 | ||
eddc9ec5 ACM |
1068 | c->mfc_parent = -1; |
1069 | c->mfc_origin = iph->saddr; | |
1070 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1071 | |
a8cb16dd ED |
1072 | /* Reflect first query at mrouted. */ |
1073 | ||
0c12295a | 1074 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1075 | if (err < 0) { |
e905a9ed | 1076 | /* If the report failed throw the cache entry |
1da177e4 LT |
1077 | out - Brad Parker |
1078 | */ | |
1079 | spin_unlock_bh(&mfc_unres_lock); | |
1080 | ||
5c0a66f5 | 1081 | ipmr_cache_free(c); |
1da177e4 LT |
1082 | kfree_skb(skb); |
1083 | return err; | |
1084 | } | |
1085 | ||
0c12295a PM |
1086 | atomic_inc(&mrt->cache_resolve_queue_len); |
1087 | list_add(&c->list, &mrt->mfc_unres_queue); | |
8cd3ac9f | 1088 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1089 | |
278554bd DM |
1090 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1091 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1092 | } |
1093 | ||
a8cb16dd ED |
1094 | /* See if we can append the packet */ |
1095 | ||
1096 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1da177e4 LT |
1097 | kfree_skb(skb); |
1098 | err = -ENOBUFS; | |
1099 | } else { | |
c354e124 | 1100 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1101 | err = 0; |
1102 | } | |
1103 | ||
1104 | spin_unlock_bh(&mfc_unres_lock); | |
1105 | return err; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * MFC cache manipulation by user space mroute daemon | |
1110 | */ | |
1111 | ||
660b26dc | 1112 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 LT |
1113 | { |
1114 | int line; | |
862465f2 | 1115 | struct mfc_cache *c, *next; |
1da177e4 | 1116 | |
c354e124 | 1117 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1118 | |
0c12295a | 1119 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1120 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1121 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1122 | (parent == -1 || parent == c->mfc_parent)) { | |
a8c9486b | 1123 | list_del_rcu(&c->list); |
8cd3ac9f | 1124 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1125 | ipmr_cache_free(c); |
1da177e4 LT |
1126 | return 0; |
1127 | } | |
1128 | } | |
1129 | return -ENOENT; | |
1130 | } | |
1131 | ||
0c12295a | 1132 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1133 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1134 | { |
862465f2 | 1135 | bool found = false; |
1da177e4 | 1136 | int line; |
862465f2 | 1137 | struct mfc_cache *uc, *c; |
1da177e4 | 1138 | |
a50436f2 PM |
1139 | if (mfc->mfcc_parent >= MAXVIFS) |
1140 | return -ENFILE; | |
1141 | ||
c354e124 | 1142 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1143 | |
0c12295a | 1144 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1145 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1146 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1147 | (parent == -1 || parent == c->mfc_parent)) { | |
862465f2 | 1148 | found = true; |
1da177e4 | 1149 | break; |
862465f2 | 1150 | } |
1da177e4 LT |
1151 | } |
1152 | ||
862465f2 | 1153 | if (found) { |
1da177e4 LT |
1154 | write_lock_bh(&mrt_lock); |
1155 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1156 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1157 | if (!mrtsock) |
1158 | c->mfc_flags |= MFC_STATIC; | |
1159 | write_unlock_bh(&mrt_lock); | |
8cd3ac9f | 1160 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1161 | return 0; |
1162 | } | |
1163 | ||
360eb5da | 1164 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1165 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1166 | return -EINVAL; |
1167 | ||
d658f8a0 | 1168 | c = ipmr_cache_alloc(); |
51456b29 | 1169 | if (!c) |
1da177e4 LT |
1170 | return -ENOMEM; |
1171 | ||
c354e124 JK |
1172 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1173 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1174 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1175 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1176 | if (!mrtsock) |
1177 | c->mfc_flags |= MFC_STATIC; | |
1178 | ||
a8c9486b | 1179 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1180 | |
1181 | /* | |
1182 | * Check to see if we resolved a queued list. If so we | |
1183 | * need to send on the frames and tidy up. | |
1184 | */ | |
b0ebb739 | 1185 | found = false; |
1da177e4 | 1186 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1187 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1188 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1189 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1190 | list_del(&uc->list); |
0c12295a | 1191 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1192 | found = true; |
1da177e4 LT |
1193 | break; |
1194 | } | |
1195 | } | |
0c12295a PM |
1196 | if (list_empty(&mrt->mfc_unres_queue)) |
1197 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1198 | spin_unlock_bh(&mfc_unres_lock); |
1199 | ||
b0ebb739 | 1200 | if (found) { |
0c12295a | 1201 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1202 | ipmr_cache_free(uc); |
1da177e4 | 1203 | } |
8cd3ac9f | 1204 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1205 | return 0; |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * Close the multicast socket, and clear the vif tables etc | |
1210 | */ | |
e905a9ed | 1211 | |
0c12295a | 1212 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1213 | { |
1214 | int i; | |
d17fa6fa | 1215 | LIST_HEAD(list); |
862465f2 | 1216 | struct mfc_cache *c, *next; |
e905a9ed | 1217 | |
a8cb16dd ED |
1218 | /* Shut down all active vif entries */ |
1219 | ||
0c12295a | 1220 | for (i = 0; i < mrt->maxvif; i++) { |
a8cb16dd | 1221 | if (!(mrt->vif_table[i].flags & VIFF_STATIC)) |
0c12295a | 1222 | vif_delete(mrt, i, 0, &list); |
1da177e4 | 1223 | } |
d17fa6fa | 1224 | unregister_netdevice_many(&list); |
1da177e4 | 1225 | |
a8cb16dd ED |
1226 | /* Wipe the cache */ |
1227 | ||
862465f2 | 1228 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1229 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
a8c9486b | 1230 | if (c->mfc_flags & MFC_STATIC) |
1da177e4 | 1231 | continue; |
a8c9486b | 1232 | list_del_rcu(&c->list); |
8cd3ac9f | 1233 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1234 | ipmr_cache_free(c); |
1da177e4 LT |
1235 | } |
1236 | } | |
1237 | ||
0c12295a | 1238 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1239 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1240 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1241 | list_del(&c->list); |
8cd3ac9f | 1242 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 1243 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1244 | } |
1245 | spin_unlock_bh(&mfc_unres_lock); | |
1246 | } | |
1247 | } | |
1248 | ||
4c968709 ED |
1249 | /* called from ip_ra_control(), before an RCU grace period, |
1250 | * we dont need to call synchronize_rcu() here | |
1251 | */ | |
1da177e4 LT |
1252 | static void mrtsock_destruct(struct sock *sk) |
1253 | { | |
4feb88e5 | 1254 | struct net *net = sock_net(sk); |
f0ad0860 | 1255 | struct mr_table *mrt; |
4feb88e5 | 1256 | |
1da177e4 | 1257 | rtnl_lock(); |
f0ad0860 | 1258 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1259 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1260 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
d67b8c61 ND |
1261 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1262 | NETCONFA_IFINDEX_ALL, | |
1263 | net->ipv4.devconf_all); | |
a9b3cd7f | 1264 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
f0ad0860 PM |
1265 | mroute_clean_tables(mrt); |
1266 | } | |
1da177e4 LT |
1267 | } |
1268 | rtnl_unlock(); | |
1269 | } | |
1270 | ||
1271 | /* | |
1272 | * Socket options and virtual interface manipulation. The whole | |
1273 | * virtual interface system is a complete heap, but unfortunately | |
1274 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1275 | * MOSPF/PIM router set up we can clean this up. | |
1276 | */ | |
e905a9ed | 1277 | |
b7058842 | 1278 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 | 1279 | { |
660b26dc | 1280 | int ret, parent = 0; |
1da177e4 LT |
1281 | struct vifctl vif; |
1282 | struct mfcctl mfc; | |
4feb88e5 | 1283 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1284 | struct mr_table *mrt; |
1285 | ||
5e1859fb ED |
1286 | if (sk->sk_type != SOCK_RAW || |
1287 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1288 | return -EOPNOTSUPP; | |
1289 | ||
f0ad0860 | 1290 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1291 | if (!mrt) |
f0ad0860 | 1292 | return -ENOENT; |
e905a9ed | 1293 | |
132adf54 | 1294 | if (optname != MRT_INIT) { |
33d480ce | 1295 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
52e804c6 | 1296 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1297 | return -EACCES; |
1298 | } | |
1299 | ||
132adf54 SH |
1300 | switch (optname) { |
1301 | case MRT_INIT: | |
c354e124 | 1302 | if (optlen != sizeof(int)) |
5e1859fb | 1303 | return -EINVAL; |
1da177e4 | 1304 | |
132adf54 | 1305 | rtnl_lock(); |
4c968709 | 1306 | if (rtnl_dereference(mrt->mroute_sk)) { |
1da177e4 | 1307 | rtnl_unlock(); |
132adf54 SH |
1308 | return -EADDRINUSE; |
1309 | } | |
1310 | ||
1311 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1312 | if (ret == 0) { | |
cf778b00 | 1313 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1314 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
d67b8c61 ND |
1315 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1316 | NETCONFA_IFINDEX_ALL, | |
1317 | net->ipv4.devconf_all); | |
132adf54 SH |
1318 | } |
1319 | rtnl_unlock(); | |
1320 | return ret; | |
1321 | case MRT_DONE: | |
33d480ce | 1322 | if (sk != rcu_access_pointer(mrt->mroute_sk)) |
132adf54 SH |
1323 | return -EACCES; |
1324 | return ip_ra_control(sk, 0, NULL); | |
1325 | case MRT_ADD_VIF: | |
1326 | case MRT_DEL_VIF: | |
c354e124 | 1327 | if (optlen != sizeof(vif)) |
132adf54 | 1328 | return -EINVAL; |
c354e124 | 1329 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1330 | return -EFAULT; |
1331 | if (vif.vifc_vifi >= MAXVIFS) | |
1332 | return -ENFILE; | |
1333 | rtnl_lock(); | |
c354e124 | 1334 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1335 | ret = vif_add(net, mrt, &vif, |
1336 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1337 | } else { |
0c12295a | 1338 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1339 | } |
1340 | rtnl_unlock(); | |
1341 | return ret; | |
1da177e4 LT |
1342 | |
1343 | /* | |
1344 | * Manipulate the forwarding caches. These live | |
1345 | * in a sort of kernel/user symbiosis. | |
1346 | */ | |
132adf54 SH |
1347 | case MRT_ADD_MFC: |
1348 | case MRT_DEL_MFC: | |
660b26dc ND |
1349 | parent = -1; |
1350 | case MRT_ADD_MFC_PROXY: | |
1351 | case MRT_DEL_MFC_PROXY: | |
c354e124 | 1352 | if (optlen != sizeof(mfc)) |
132adf54 | 1353 | return -EINVAL; |
c354e124 | 1354 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 | 1355 | return -EFAULT; |
660b26dc ND |
1356 | if (parent == 0) |
1357 | parent = mfc.mfcc_parent; | |
132adf54 | 1358 | rtnl_lock(); |
660b26dc ND |
1359 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1360 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1361 | else |
4c968709 | 1362 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1363 | sk == rtnl_dereference(mrt->mroute_sk), |
1364 | parent); | |
132adf54 SH |
1365 | rtnl_unlock(); |
1366 | return ret; | |
1da177e4 LT |
1367 | /* |
1368 | * Control PIM assert. | |
1369 | */ | |
132adf54 SH |
1370 | case MRT_ASSERT: |
1371 | { | |
1372 | int v; | |
5e1859fb ED |
1373 | if (optlen != sizeof(v)) |
1374 | return -EINVAL; | |
a8cb16dd | 1375 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1376 | return -EFAULT; |
53d6841d | 1377 | mrt->mroute_do_assert = v; |
132adf54 SH |
1378 | return 0; |
1379 | } | |
1da177e4 | 1380 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1381 | case MRT_PIM: |
1382 | { | |
ba93ef74 SH |
1383 | int v; |
1384 | ||
5e1859fb ED |
1385 | if (optlen != sizeof(v)) |
1386 | return -EINVAL; | |
a8cb16dd | 1387 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1388 | return -EFAULT; |
5e1859fb | 1389 | v = !!v; |
ba93ef74 | 1390 | |
132adf54 SH |
1391 | rtnl_lock(); |
1392 | ret = 0; | |
0c12295a PM |
1393 | if (v != mrt->mroute_do_pim) { |
1394 | mrt->mroute_do_pim = v; | |
1395 | mrt->mroute_do_assert = v; | |
1da177e4 | 1396 | } |
132adf54 SH |
1397 | rtnl_unlock(); |
1398 | return ret; | |
1399 | } | |
f0ad0860 PM |
1400 | #endif |
1401 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1402 | case MRT_TABLE: | |
1403 | { | |
1404 | u32 v; | |
1405 | ||
1406 | if (optlen != sizeof(u32)) | |
1407 | return -EINVAL; | |
1408 | if (get_user(v, (u32 __user *)optval)) | |
1409 | return -EFAULT; | |
f0ad0860 PM |
1410 | |
1411 | rtnl_lock(); | |
1412 | ret = 0; | |
4c968709 ED |
1413 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1414 | ret = -EBUSY; | |
1415 | } else { | |
1113ebbc NA |
1416 | mrt = ipmr_new_table(net, v); |
1417 | if (IS_ERR(mrt)) | |
1418 | ret = PTR_ERR(mrt); | |
5e1859fb ED |
1419 | else |
1420 | raw_sk(sk)->ipmr_table = v; | |
4c968709 | 1421 | } |
f0ad0860 PM |
1422 | rtnl_unlock(); |
1423 | return ret; | |
1424 | } | |
1da177e4 | 1425 | #endif |
132adf54 SH |
1426 | /* |
1427 | * Spurious command, or MRT_VERSION which you cannot | |
1428 | * set. | |
1429 | */ | |
1430 | default: | |
1431 | return -ENOPROTOOPT; | |
1da177e4 LT |
1432 | } |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * Getsock opt support for the multicast routing system. | |
1437 | */ | |
e905a9ed | 1438 | |
c354e124 | 1439 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1440 | { |
1441 | int olr; | |
1442 | int val; | |
4feb88e5 | 1443 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1444 | struct mr_table *mrt; |
1445 | ||
5e1859fb ED |
1446 | if (sk->sk_type != SOCK_RAW || |
1447 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1448 | return -EOPNOTSUPP; | |
1449 | ||
f0ad0860 | 1450 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
51456b29 | 1451 | if (!mrt) |
f0ad0860 | 1452 | return -ENOENT; |
1da177e4 | 1453 | |
c354e124 | 1454 | if (optname != MRT_VERSION && |
1da177e4 | 1455 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 1456 | optname != MRT_PIM && |
1da177e4 | 1457 | #endif |
a8cb16dd | 1458 | optname != MRT_ASSERT) |
1da177e4 LT |
1459 | return -ENOPROTOOPT; |
1460 | ||
1461 | if (get_user(olr, optlen)) | |
1462 | return -EFAULT; | |
1463 | ||
1464 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1465 | if (olr < 0) | |
1466 | return -EINVAL; | |
e905a9ed | 1467 | |
c354e124 | 1468 | if (put_user(olr, optlen)) |
1da177e4 | 1469 | return -EFAULT; |
c354e124 JK |
1470 | if (optname == MRT_VERSION) |
1471 | val = 0x0305; | |
1da177e4 | 1472 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1473 | else if (optname == MRT_PIM) |
0c12295a | 1474 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1475 | #endif |
1476 | else | |
0c12295a | 1477 | val = mrt->mroute_do_assert; |
c354e124 | 1478 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1479 | return -EFAULT; |
1480 | return 0; | |
1481 | } | |
1482 | ||
1483 | /* | |
1484 | * The IP multicast ioctl support routines. | |
1485 | */ | |
e905a9ed | 1486 | |
1da177e4 LT |
1487 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1488 | { | |
1489 | struct sioc_sg_req sr; | |
1490 | struct sioc_vif_req vr; | |
1491 | struct vif_device *vif; | |
1492 | struct mfc_cache *c; | |
4feb88e5 | 1493 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1494 | struct mr_table *mrt; |
1495 | ||
1496 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1497 | if (!mrt) |
f0ad0860 | 1498 | return -ENOENT; |
e905a9ed | 1499 | |
132adf54 SH |
1500 | switch (cmd) { |
1501 | case SIOCGETVIFCNT: | |
c354e124 | 1502 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1503 | return -EFAULT; |
0c12295a | 1504 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1505 | return -EINVAL; |
1506 | read_lock(&mrt_lock); | |
0c12295a PM |
1507 | vif = &mrt->vif_table[vr.vifi]; |
1508 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1509 | vr.icount = vif->pkt_in; |
1510 | vr.ocount = vif->pkt_out; | |
1511 | vr.ibytes = vif->bytes_in; | |
1512 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1513 | read_unlock(&mrt_lock); |
1da177e4 | 1514 | |
c354e124 | 1515 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1516 | return -EFAULT; |
1517 | return 0; | |
1518 | } | |
1519 | read_unlock(&mrt_lock); | |
1520 | return -EADDRNOTAVAIL; | |
1521 | case SIOCGETSGCNT: | |
c354e124 | 1522 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1523 | return -EFAULT; |
1524 | ||
a8c9486b | 1525 | rcu_read_lock(); |
0c12295a | 1526 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1527 | if (c) { |
1528 | sr.pktcnt = c->mfc_un.res.pkt; | |
1529 | sr.bytecnt = c->mfc_un.res.bytes; | |
1530 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1531 | rcu_read_unlock(); |
132adf54 | 1532 | |
c354e124 | 1533 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1534 | return -EFAULT; |
1535 | return 0; | |
1536 | } | |
a8c9486b | 1537 | rcu_read_unlock(); |
132adf54 SH |
1538 | return -EADDRNOTAVAIL; |
1539 | default: | |
1540 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1541 | } |
1542 | } | |
1543 | ||
709b46e8 EB |
1544 | #ifdef CONFIG_COMPAT |
1545 | struct compat_sioc_sg_req { | |
1546 | struct in_addr src; | |
1547 | struct in_addr grp; | |
1548 | compat_ulong_t pktcnt; | |
1549 | compat_ulong_t bytecnt; | |
1550 | compat_ulong_t wrong_if; | |
1551 | }; | |
1552 | ||
ca6b8bb0 DM |
1553 | struct compat_sioc_vif_req { |
1554 | vifi_t vifi; /* Which iface */ | |
1555 | compat_ulong_t icount; | |
1556 | compat_ulong_t ocount; | |
1557 | compat_ulong_t ibytes; | |
1558 | compat_ulong_t obytes; | |
1559 | }; | |
1560 | ||
709b46e8 EB |
1561 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1562 | { | |
0033d5ad | 1563 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1564 | struct compat_sioc_vif_req vr; |
1565 | struct vif_device *vif; | |
709b46e8 EB |
1566 | struct mfc_cache *c; |
1567 | struct net *net = sock_net(sk); | |
1568 | struct mr_table *mrt; | |
1569 | ||
1570 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
51456b29 | 1571 | if (!mrt) |
709b46e8 EB |
1572 | return -ENOENT; |
1573 | ||
1574 | switch (cmd) { | |
ca6b8bb0 DM |
1575 | case SIOCGETVIFCNT: |
1576 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1577 | return -EFAULT; | |
1578 | if (vr.vifi >= mrt->maxvif) | |
1579 | return -EINVAL; | |
1580 | read_lock(&mrt_lock); | |
1581 | vif = &mrt->vif_table[vr.vifi]; | |
1582 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1583 | vr.icount = vif->pkt_in; | |
1584 | vr.ocount = vif->pkt_out; | |
1585 | vr.ibytes = vif->bytes_in; | |
1586 | vr.obytes = vif->bytes_out; | |
1587 | read_unlock(&mrt_lock); | |
1588 | ||
1589 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1590 | return -EFAULT; | |
1591 | return 0; | |
1592 | } | |
1593 | read_unlock(&mrt_lock); | |
1594 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1595 | case SIOCGETSGCNT: |
1596 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1597 | return -EFAULT; | |
1598 | ||
1599 | rcu_read_lock(); | |
1600 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1601 | if (c) { | |
1602 | sr.pktcnt = c->mfc_un.res.pkt; | |
1603 | sr.bytecnt = c->mfc_un.res.bytes; | |
1604 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1605 | rcu_read_unlock(); | |
1606 | ||
1607 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1608 | return -EFAULT; | |
1609 | return 0; | |
1610 | } | |
1611 | rcu_read_unlock(); | |
1612 | return -EADDRNOTAVAIL; | |
1613 | default: | |
1614 | return -ENOIOCTLCMD; | |
1615 | } | |
1616 | } | |
1617 | #endif | |
1618 | ||
1da177e4 LT |
1619 | |
1620 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1621 | { | |
351638e7 | 1622 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1623 | struct net *net = dev_net(dev); |
f0ad0860 | 1624 | struct mr_table *mrt; |
1da177e4 LT |
1625 | struct vif_device *v; |
1626 | int ct; | |
e9dc8653 | 1627 | |
1da177e4 LT |
1628 | if (event != NETDEV_UNREGISTER) |
1629 | return NOTIFY_DONE; | |
f0ad0860 PM |
1630 | |
1631 | ipmr_for_each_table(mrt, net) { | |
1632 | v = &mrt->vif_table[0]; | |
1633 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1634 | if (v->dev == dev) | |
e92036a6 | 1635 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1636 | } |
1da177e4 LT |
1637 | } |
1638 | return NOTIFY_DONE; | |
1639 | } | |
1640 | ||
1641 | ||
c354e124 | 1642 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1643 | .notifier_call = ipmr_device_event, |
1644 | }; | |
1645 | ||
1646 | /* | |
a8cb16dd | 1647 | * Encapsulate a packet by attaching a valid IPIP header to it. |
1da177e4 LT |
1648 | * This avoids tunnel drivers and other mess and gives us the speed so |
1649 | * important for multicast video. | |
1650 | */ | |
e905a9ed | 1651 | |
b6a7719a HFS |
1652 | static void ip_encap(struct net *net, struct sk_buff *skb, |
1653 | __be32 saddr, __be32 daddr) | |
1da177e4 | 1654 | { |
8856dfa3 | 1655 | struct iphdr *iph; |
b71d1d42 | 1656 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1657 | |
1658 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1659 | skb->transport_header = skb->network_header; |
8856dfa3 | 1660 | skb_reset_network_header(skb); |
eddc9ec5 | 1661 | iph = ip_hdr(skb); |
1da177e4 | 1662 | |
a8cb16dd | 1663 | iph->version = 4; |
e023dd64 ACM |
1664 | iph->tos = old_iph->tos; |
1665 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1666 | iph->frag_off = 0; |
1667 | iph->daddr = daddr; | |
1668 | iph->saddr = saddr; | |
1669 | iph->protocol = IPPROTO_IPIP; | |
1670 | iph->ihl = 5; | |
1671 | iph->tot_len = htons(skb->len); | |
b6a7719a | 1672 | ip_select_ident(net, skb, NULL); |
1da177e4 LT |
1673 | ip_send_check(iph); |
1674 | ||
1da177e4 LT |
1675 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1676 | nf_reset(skb); | |
1677 | } | |
1678 | ||
0c4b51f0 EB |
1679 | static inline int ipmr_forward_finish(struct net *net, struct sock *sk, |
1680 | struct sk_buff *skb) | |
1da177e4 | 1681 | { |
a8cb16dd | 1682 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1683 | |
73186df8 DM |
1684 | IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS); |
1685 | IP_ADD_STATS(net, IPSTATS_MIB_OUTOCTETS, skb->len); | |
1da177e4 LT |
1686 | |
1687 | if (unlikely(opt->optlen)) | |
1688 | ip_forward_options(skb); | |
1689 | ||
13206b6b | 1690 | return dst_output(net, sk, skb); |
1da177e4 LT |
1691 | } |
1692 | ||
1693 | /* | |
1694 | * Processing handlers for ipmr_forward | |
1695 | */ | |
1696 | ||
0c12295a PM |
1697 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1698 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1699 | { |
eddc9ec5 | 1700 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1701 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1702 | struct net_device *dev; |
1703 | struct rtable *rt; | |
31e4543d | 1704 | struct flowi4 fl4; |
1da177e4 LT |
1705 | int encap = 0; |
1706 | ||
51456b29 | 1707 | if (!vif->dev) |
1da177e4 LT |
1708 | goto out_free; |
1709 | ||
1710 | #ifdef CONFIG_IP_PIMSM | |
1711 | if (vif->flags & VIFF_REGISTER) { | |
1712 | vif->pkt_out++; | |
c354e124 | 1713 | vif->bytes_out += skb->len; |
cf3677ae PE |
1714 | vif->dev->stats.tx_bytes += skb->len; |
1715 | vif->dev->stats.tx_packets++; | |
0c12295a | 1716 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1717 | goto out_free; |
1da177e4 LT |
1718 | } |
1719 | #endif | |
1720 | ||
a8cb16dd | 1721 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1722 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1723 | vif->remote, vif->local, |
1724 | 0, 0, | |
1725 | IPPROTO_IPIP, | |
1726 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1727 | if (IS_ERR(rt)) |
1da177e4 LT |
1728 | goto out_free; |
1729 | encap = sizeof(struct iphdr); | |
1730 | } else { | |
31e4543d | 1731 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1732 | 0, 0, |
1733 | IPPROTO_IPIP, | |
1734 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1735 | if (IS_ERR(rt)) |
1da177e4 LT |
1736 | goto out_free; |
1737 | } | |
1738 | ||
d8d1f30b | 1739 | dev = rt->dst.dev; |
1da177e4 | 1740 | |
d8d1f30b | 1741 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1742 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1743 | * allow to send ICMP, so that packets will disappear |
1744 | * to blackhole. | |
1da177e4 LT |
1745 | */ |
1746 | ||
73186df8 | 1747 | IP_INC_STATS(net, IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1748 | ip_rt_put(rt); |
1749 | goto out_free; | |
1750 | } | |
1751 | ||
d8d1f30b | 1752 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1753 | |
1754 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1755 | ip_rt_put(rt); |
1da177e4 LT |
1756 | goto out_free; |
1757 | } | |
1758 | ||
1759 | vif->pkt_out++; | |
c354e124 | 1760 | vif->bytes_out += skb->len; |
1da177e4 | 1761 | |
adf30907 | 1762 | skb_dst_drop(skb); |
d8d1f30b | 1763 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1764 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1765 | |
1766 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1767 | * What do we do with netfilter? -- RR |
1768 | */ | |
1da177e4 | 1769 | if (vif->flags & VIFF_TUNNEL) { |
b6a7719a | 1770 | ip_encap(net, skb, vif->local, vif->remote); |
1da177e4 | 1771 | /* FIXME: extra output firewall step used to be here. --RR */ |
2f4c02d4 PE |
1772 | vif->dev->stats.tx_packets++; |
1773 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1774 | } |
1775 | ||
1776 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1777 | ||
1778 | /* | |
1779 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1780 | * not only before forwarding, but after forwarding on all output | |
1781 | * interfaces. It is clear, if mrouter runs a multicasting | |
1782 | * program, it should receive packets not depending to what interface | |
1783 | * program is joined. | |
1784 | * If we will not make it, the program will have to join on all | |
1785 | * interfaces. On the other hand, multihoming host (or router, but | |
1786 | * not mrouter) cannot join to more than one interface - it will | |
1787 | * result in receiving multiple packets. | |
1788 | */ | |
29a26a56 EB |
1789 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, |
1790 | net, NULL, skb, skb->dev, dev, | |
1da177e4 LT |
1791 | ipmr_forward_finish); |
1792 | return; | |
1793 | ||
1794 | out_free: | |
1795 | kfree_skb(skb); | |
1da177e4 LT |
1796 | } |
1797 | ||
0c12295a | 1798 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1799 | { |
1800 | int ct; | |
0c12295a PM |
1801 | |
1802 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1803 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1804 | break; |
1805 | } | |
1806 | return ct; | |
1807 | } | |
1808 | ||
1809 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1810 | ||
c4854ec8 RR |
1811 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
1812 | struct sk_buff *skb, struct mfc_cache *cache, | |
1813 | int local) | |
1da177e4 LT |
1814 | { |
1815 | int psend = -1; | |
1816 | int vif, ct; | |
660b26dc | 1817 | int true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 LT |
1818 | |
1819 | vif = cache->mfc_parent; | |
1820 | cache->mfc_un.res.pkt++; | |
1821 | cache->mfc_un.res.bytes += skb->len; | |
1822 | ||
360eb5da | 1823 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1824 | struct mfc_cache *cache_proxy; |
1825 | ||
1826 | /* For an (*,G) entry, we only check that the incomming | |
1827 | * interface is part of the static tree. | |
1828 | */ | |
1829 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); | |
1830 | if (cache_proxy && | |
1831 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) | |
1832 | goto forward; | |
1833 | } | |
1834 | ||
1da177e4 LT |
1835 | /* |
1836 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1837 | */ | |
0c12295a | 1838 | if (mrt->vif_table[vif].dev != skb->dev) { |
c7537967 | 1839 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1840 | /* It is our own packet, looped back. |
a8cb16dd ED |
1841 | * Very complicated situation... |
1842 | * | |
1843 | * The best workaround until routing daemons will be | |
1844 | * fixed is not to redistribute packet, if it was | |
1845 | * send through wrong interface. It means, that | |
1846 | * multicast applications WILL NOT work for | |
1847 | * (S,G), which have default multicast route pointing | |
1848 | * to wrong oif. In any case, it is not a good | |
1849 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1850 | */ |
1851 | goto dont_forward; | |
1852 | } | |
1853 | ||
1854 | cache->mfc_un.res.wrong_if++; | |
1da177e4 | 1855 | |
0c12295a | 1856 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1857 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1858 | * so that we cannot check that packet arrived on an oif. |
1859 | * It is bad, but otherwise we would need to move pretty | |
1860 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1861 | */ |
0c12295a | 1862 | (mrt->mroute_do_pim || |
6f9374a9 | 1863 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1864 | time_after(jiffies, |
1da177e4 LT |
1865 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1866 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1867 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1868 | } |
1869 | goto dont_forward; | |
1870 | } | |
1871 | ||
660b26dc | 1872 | forward: |
0c12295a PM |
1873 | mrt->vif_table[vif].pkt_in++; |
1874 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1875 | |
1876 | /* | |
1877 | * Forward the frame | |
1878 | */ | |
360eb5da ND |
1879 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
1880 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc ND |
1881 | if (true_vifi >= 0 && |
1882 | true_vifi != cache->mfc_parent && | |
1883 | ip_hdr(skb)->ttl > | |
1884 | cache->mfc_un.res.ttls[cache->mfc_parent]) { | |
1885 | /* It's an (*,*) entry and the packet is not coming from | |
1886 | * the upstream: forward the packet to the upstream | |
1887 | * only. | |
1888 | */ | |
1889 | psend = cache->mfc_parent; | |
1890 | goto last_forward; | |
1891 | } | |
1892 | goto dont_forward; | |
1893 | } | |
a8cb16dd ED |
1894 | for (ct = cache->mfc_un.res.maxvif - 1; |
1895 | ct >= cache->mfc_un.res.minvif; ct--) { | |
660b26dc | 1896 | /* For (*,G) entry, don't forward to the incoming interface */ |
360eb5da ND |
1897 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
1898 | ct != true_vifi) && | |
660b26dc | 1899 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1900 | if (psend != -1) { |
1901 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1902 | |
1da177e4 | 1903 | if (skb2) |
0c12295a PM |
1904 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1905 | psend); | |
1da177e4 | 1906 | } |
c354e124 | 1907 | psend = ct; |
1da177e4 LT |
1908 | } |
1909 | } | |
660b26dc | 1910 | last_forward: |
1da177e4 LT |
1911 | if (psend != -1) { |
1912 | if (local) { | |
1913 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1914 | |
1da177e4 | 1915 | if (skb2) |
0c12295a | 1916 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1917 | } else { |
0c12295a | 1918 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
c4854ec8 | 1919 | return; |
1da177e4 LT |
1920 | } |
1921 | } | |
1922 | ||
1923 | dont_forward: | |
1924 | if (!local) | |
1925 | kfree_skb(skb); | |
1da177e4 LT |
1926 | } |
1927 | ||
417da66f | 1928 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 1929 | { |
417da66f DM |
1930 | struct rtable *rt = skb_rtable(skb); |
1931 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 1932 | struct flowi4 fl4 = { |
417da66f DM |
1933 | .daddr = iph->daddr, |
1934 | .saddr = iph->saddr, | |
b0fe4a31 | 1935 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
1936 | .flowi4_oif = (rt_is_output_route(rt) ? |
1937 | skb->dev->ifindex : 0), | |
1938 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 1939 | LOOPBACK_IFINDEX : |
4fd551d7 | 1940 | skb->dev->ifindex), |
b4869889 | 1941 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
1942 | }; |
1943 | struct mr_table *mrt; | |
1944 | int err; | |
1945 | ||
da91981b | 1946 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
1947 | if (err) |
1948 | return ERR_PTR(err); | |
1949 | return mrt; | |
1950 | } | |
1da177e4 LT |
1951 | |
1952 | /* | |
1953 | * Multicast packets for forwarding arrive here | |
4c968709 | 1954 | * Called with rcu_read_lock(); |
1da177e4 LT |
1955 | */ |
1956 | ||
1957 | int ip_mr_input(struct sk_buff *skb) | |
1958 | { | |
1959 | struct mfc_cache *cache; | |
4feb88e5 | 1960 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1961 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 1962 | struct mr_table *mrt; |
1da177e4 LT |
1963 | |
1964 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 1965 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 1966 | */ |
4c968709 | 1967 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
1968 | goto dont_forward; |
1969 | ||
417da66f | 1970 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
1971 | if (IS_ERR(mrt)) { |
1972 | kfree_skb(skb); | |
1973 | return PTR_ERR(mrt); | |
e40dbc51 | 1974 | } |
1da177e4 | 1975 | if (!local) { |
4c968709 ED |
1976 | if (IPCB(skb)->opt.router_alert) { |
1977 | if (ip_call_ra_chain(skb)) | |
1978 | return 0; | |
1979 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1980 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1981 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1982 | * option to IGMP packets destined to routable | |
1983 | * groups. It is very bad, because it means | |
1984 | * that we can forward NO IGMP messages. | |
1985 | */ | |
1986 | struct sock *mroute_sk; | |
1987 | ||
1988 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1989 | if (mroute_sk) { | |
1990 | nf_reset(skb); | |
1991 | raw_rcv(mroute_sk, skb); | |
1992 | return 0; | |
1993 | } | |
1da177e4 LT |
1994 | } |
1995 | } | |
1996 | ||
a8c9486b | 1997 | /* already under rcu_read_lock() */ |
0c12295a | 1998 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
51456b29 | 1999 | if (!cache) { |
660b26dc ND |
2000 | int vif = ipmr_find_vif(mrt, skb->dev); |
2001 | ||
2002 | if (vif >= 0) | |
2003 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
2004 | vif); | |
2005 | } | |
1da177e4 LT |
2006 | |
2007 | /* | |
2008 | * No usable cache entry | |
2009 | */ | |
51456b29 | 2010 | if (!cache) { |
1da177e4 LT |
2011 | int vif; |
2012 | ||
2013 | if (local) { | |
2014 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2015 | ip_local_deliver(skb); | |
51456b29 | 2016 | if (!skb2) |
1da177e4 | 2017 | return -ENOBUFS; |
1da177e4 LT |
2018 | skb = skb2; |
2019 | } | |
2020 | ||
a8c9486b | 2021 | read_lock(&mrt_lock); |
0c12295a | 2022 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2023 | if (vif >= 0) { |
0eae88f3 | 2024 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
2025 | read_unlock(&mrt_lock); |
2026 | ||
0eae88f3 | 2027 | return err2; |
1da177e4 LT |
2028 | } |
2029 | read_unlock(&mrt_lock); | |
2030 | kfree_skb(skb); | |
2031 | return -ENODEV; | |
2032 | } | |
2033 | ||
a8c9486b | 2034 | read_lock(&mrt_lock); |
0c12295a | 2035 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
2036 | read_unlock(&mrt_lock); |
2037 | ||
2038 | if (local) | |
2039 | return ip_local_deliver(skb); | |
2040 | ||
2041 | return 0; | |
2042 | ||
2043 | dont_forward: | |
2044 | if (local) | |
2045 | return ip_local_deliver(skb); | |
2046 | kfree_skb(skb); | |
2047 | return 0; | |
2048 | } | |
2049 | ||
b1879204 | 2050 | #ifdef CONFIG_IP_PIMSM |
55747a0a | 2051 | /* called with rcu_read_lock() */ |
f0ad0860 PM |
2052 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
2053 | unsigned int pimlen) | |
1da177e4 | 2054 | { |
b1879204 IJ |
2055 | struct net_device *reg_dev = NULL; |
2056 | struct iphdr *encap; | |
1da177e4 | 2057 | |
b1879204 | 2058 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 | 2059 | /* |
a8cb16dd ED |
2060 | * Check that: |
2061 | * a. packet is really sent to a multicast group | |
2062 | * b. packet is not a NULL-REGISTER | |
2063 | * c. packet is not truncated | |
1da177e4 | 2064 | */ |
f97c1e0c | 2065 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 2066 | encap->tot_len == 0 || |
b1879204 IJ |
2067 | ntohs(encap->tot_len) + pimlen > skb->len) |
2068 | return 1; | |
1da177e4 LT |
2069 | |
2070 | read_lock(&mrt_lock); | |
0c12295a PM |
2071 | if (mrt->mroute_reg_vif_num >= 0) |
2072 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
2073 | read_unlock(&mrt_lock); |
2074 | ||
51456b29 | 2075 | if (!reg_dev) |
b1879204 | 2076 | return 1; |
1da177e4 | 2077 | |
b0e380b1 | 2078 | skb->mac_header = skb->network_header; |
55747a0a | 2079 | skb_pull(skb, (u8 *)encap - skb->data); |
31c7711b | 2080 | skb_reset_network_header(skb); |
1da177e4 | 2081 | skb->protocol = htons(ETH_P_IP); |
55747a0a | 2082 | skb->ip_summed = CHECKSUM_NONE; |
d19d56dd | 2083 | |
ea23192e | 2084 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
d19d56dd | 2085 | |
1da177e4 | 2086 | netif_rx(skb); |
b1879204 | 2087 | |
55747a0a | 2088 | return NET_RX_SUCCESS; |
b1879204 IJ |
2089 | } |
2090 | #endif | |
2091 | ||
2092 | #ifdef CONFIG_IP_PIMSM_V1 | |
2093 | /* | |
2094 | * Handle IGMP messages of PIMv1 | |
2095 | */ | |
2096 | ||
a8cb16dd | 2097 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2098 | { |
2099 | struct igmphdr *pim; | |
4feb88e5 | 2100 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2101 | struct mr_table *mrt; |
b1879204 IJ |
2102 | |
2103 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2104 | goto drop; | |
2105 | ||
2106 | pim = igmp_hdr(skb); | |
2107 | ||
417da66f | 2108 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2109 | if (IS_ERR(mrt)) |
2110 | goto drop; | |
0c12295a | 2111 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2112 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2113 | goto drop; | |
2114 | ||
f0ad0860 | 2115 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2116 | drop: |
2117 | kfree_skb(skb); | |
2118 | } | |
1da177e4 LT |
2119 | return 0; |
2120 | } | |
2121 | #endif | |
2122 | ||
2123 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2124 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2125 | { |
2126 | struct pimreghdr *pim; | |
f0ad0860 PM |
2127 | struct net *net = dev_net(skb->dev); |
2128 | struct mr_table *mrt; | |
1da177e4 | 2129 | |
b1879204 | 2130 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2131 | goto drop; |
2132 | ||
9c70220b | 2133 | pim = (struct pimreghdr *)skb_transport_header(skb); |
a8cb16dd ED |
2134 | if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || |
2135 | (pim->flags & PIM_NULL_REGISTER) || | |
e905a9ed | 2136 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2137 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2138 | goto drop; |
2139 | ||
417da66f | 2140 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2141 | if (IS_ERR(mrt)) |
2142 | goto drop; | |
f0ad0860 | 2143 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2144 | drop: |
2145 | kfree_skb(skb); | |
2146 | } | |
1da177e4 LT |
2147 | return 0; |
2148 | } | |
2149 | #endif | |
2150 | ||
cb6a4e46 PM |
2151 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2152 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 LT |
2153 | { |
2154 | int ct; | |
2155 | struct rtnexthop *nhp; | |
92a395e5 | 2156 | struct nlattr *mp_attr; |
adfa85e4 | 2157 | struct rta_mfc_stats mfcs; |
1da177e4 | 2158 | |
7438189b | 2159 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2160 | if (c->mfc_parent >= MAXVIFS) |
7438189b ND |
2161 | return -ENOENT; |
2162 | ||
92a395e5 TG |
2163 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
2164 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) | |
2165 | return -EMSGSIZE; | |
1da177e4 | 2166 | |
92a395e5 TG |
2167 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
2168 | return -EMSGSIZE; | |
1da177e4 LT |
2169 | |
2170 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 2171 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
92a395e5 TG |
2172 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
2173 | nla_nest_cancel(skb, mp_attr); | |
2174 | return -EMSGSIZE; | |
2175 | } | |
2176 | ||
1da177e4 LT |
2177 | nhp->rtnh_flags = 0; |
2178 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 2179 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
2180 | nhp->rtnh_len = sizeof(*nhp); |
2181 | } | |
2182 | } | |
92a395e5 TG |
2183 | |
2184 | nla_nest_end(skb, mp_attr); | |
2185 | ||
adfa85e4 ND |
2186 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2187 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2188 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
2189 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) | |
2190 | return -EMSGSIZE; | |
2191 | ||
1da177e4 LT |
2192 | rtm->rtm_type = RTN_MULTICAST; |
2193 | return 1; | |
1da177e4 LT |
2194 | } |
2195 | ||
9a1b9496 DM |
2196 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2197 | __be32 saddr, __be32 daddr, | |
2198 | struct rtmsg *rtm, int nowait) | |
1da177e4 | 2199 | { |
1da177e4 | 2200 | struct mfc_cache *cache; |
9a1b9496 DM |
2201 | struct mr_table *mrt; |
2202 | int err; | |
1da177e4 | 2203 | |
f0ad0860 | 2204 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2205 | if (!mrt) |
f0ad0860 PM |
2206 | return -ENOENT; |
2207 | ||
a8c9486b | 2208 | rcu_read_lock(); |
9a1b9496 | 2209 | cache = ipmr_cache_find(mrt, saddr, daddr); |
51456b29 | 2210 | if (!cache && skb->dev) { |
660b26dc | 2211 | int vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2212 | |
660b26dc ND |
2213 | if (vif >= 0) |
2214 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2215 | } | |
51456b29 | 2216 | if (!cache) { |
72287490 | 2217 | struct sk_buff *skb2; |
eddc9ec5 | 2218 | struct iphdr *iph; |
1da177e4 | 2219 | struct net_device *dev; |
a8cb16dd | 2220 | int vif = -1; |
1da177e4 LT |
2221 | |
2222 | if (nowait) { | |
a8c9486b | 2223 | rcu_read_unlock(); |
1da177e4 LT |
2224 | return -EAGAIN; |
2225 | } | |
2226 | ||
2227 | dev = skb->dev; | |
a8c9486b | 2228 | read_lock(&mrt_lock); |
a8cb16dd ED |
2229 | if (dev) |
2230 | vif = ipmr_find_vif(mrt, dev); | |
2231 | if (vif < 0) { | |
1da177e4 | 2232 | read_unlock(&mrt_lock); |
a8c9486b | 2233 | rcu_read_unlock(); |
1da177e4 LT |
2234 | return -ENODEV; |
2235 | } | |
72287490 AK |
2236 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2237 | if (!skb2) { | |
2238 | read_unlock(&mrt_lock); | |
a8c9486b | 2239 | rcu_read_unlock(); |
72287490 AK |
2240 | return -ENOMEM; |
2241 | } | |
2242 | ||
e2d1bca7 ACM |
2243 | skb_push(skb2, sizeof(struct iphdr)); |
2244 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2245 | iph = ip_hdr(skb2); |
2246 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2247 | iph->saddr = saddr; |
2248 | iph->daddr = daddr; | |
eddc9ec5 | 2249 | iph->version = 0; |
0c12295a | 2250 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 | 2251 | read_unlock(&mrt_lock); |
a8c9486b | 2252 | rcu_read_unlock(); |
1da177e4 LT |
2253 | return err; |
2254 | } | |
2255 | ||
a8c9486b ED |
2256 | read_lock(&mrt_lock); |
2257 | if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) | |
1da177e4 | 2258 | cache->mfc_flags |= MFC_NOTIFY; |
cb6a4e46 | 2259 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2260 | read_unlock(&mrt_lock); |
a8c9486b | 2261 | rcu_read_unlock(); |
1da177e4 LT |
2262 | return err; |
2263 | } | |
2264 | ||
cb6a4e46 | 2265 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2266 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2267 | int flags) | |
cb6a4e46 PM |
2268 | { |
2269 | struct nlmsghdr *nlh; | |
2270 | struct rtmsg *rtm; | |
1eb99af5 | 2271 | int err; |
cb6a4e46 | 2272 | |
65886f43 | 2273 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
51456b29 | 2274 | if (!nlh) |
cb6a4e46 PM |
2275 | return -EMSGSIZE; |
2276 | ||
2277 | rtm = nlmsg_data(nlh); | |
2278 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2279 | rtm->rtm_dst_len = 32; | |
2280 | rtm->rtm_src_len = 32; | |
2281 | rtm->rtm_tos = 0; | |
2282 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2283 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2284 | goto nla_put_failure; | |
cb6a4e46 PM |
2285 | rtm->rtm_type = RTN_MULTICAST; |
2286 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
9a68ac72 ND |
2287 | if (c->mfc_flags & MFC_STATIC) |
2288 | rtm->rtm_protocol = RTPROT_STATIC; | |
2289 | else | |
2290 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2291 | rtm->rtm_flags = 0; |
2292 | ||
930345ea JB |
2293 | if (nla_put_in_addr(skb, RTA_SRC, c->mfc_origin) || |
2294 | nla_put_in_addr(skb, RTA_DST, c->mfc_mcastgrp)) | |
f3756b79 | 2295 | goto nla_put_failure; |
1eb99af5 ND |
2296 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
2297 | /* do not break the dump if cache is unresolved */ | |
2298 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2299 | goto nla_put_failure; |
2300 | ||
053c095a JB |
2301 | nlmsg_end(skb, nlh); |
2302 | return 0; | |
cb6a4e46 PM |
2303 | |
2304 | nla_put_failure: | |
2305 | nlmsg_cancel(skb, nlh); | |
2306 | return -EMSGSIZE; | |
2307 | } | |
2308 | ||
8cd3ac9f ND |
2309 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2310 | { | |
2311 | size_t len = | |
2312 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2313 | + nla_total_size(4) /* RTA_TABLE */ | |
2314 | + nla_total_size(4) /* RTA_SRC */ | |
2315 | + nla_total_size(4) /* RTA_DST */ | |
2316 | ; | |
2317 | ||
2318 | if (!unresolved) | |
2319 | len = len | |
2320 | + nla_total_size(4) /* RTA_IIF */ | |
2321 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2322 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2323 | /* RTA_MFC_STATS */ | |
2324 | + nla_total_size(sizeof(struct rta_mfc_stats)) | |
2325 | ; | |
2326 | ||
2327 | return len; | |
2328 | } | |
2329 | ||
2330 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2331 | int cmd) | |
2332 | { | |
2333 | struct net *net = read_pnet(&mrt->net); | |
2334 | struct sk_buff *skb; | |
2335 | int err = -ENOBUFS; | |
2336 | ||
2337 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), | |
2338 | GFP_ATOMIC); | |
51456b29 | 2339 | if (!skb) |
8cd3ac9f ND |
2340 | goto errout; |
2341 | ||
65886f43 | 2342 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2343 | if (err < 0) |
2344 | goto errout; | |
2345 | ||
2346 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2347 | return; | |
2348 | ||
2349 | errout: | |
2350 | kfree_skb(skb); | |
2351 | if (err < 0) | |
2352 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2353 | } | |
2354 | ||
cb6a4e46 PM |
2355 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2356 | { | |
2357 | struct net *net = sock_net(skb->sk); | |
2358 | struct mr_table *mrt; | |
2359 | struct mfc_cache *mfc; | |
2360 | unsigned int t = 0, s_t; | |
2361 | unsigned int h = 0, s_h; | |
2362 | unsigned int e = 0, s_e; | |
2363 | ||
2364 | s_t = cb->args[0]; | |
2365 | s_h = cb->args[1]; | |
2366 | s_e = cb->args[2]; | |
2367 | ||
a8c9486b | 2368 | rcu_read_lock(); |
cb6a4e46 PM |
2369 | ipmr_for_each_table(mrt, net) { |
2370 | if (t < s_t) | |
2371 | goto next_table; | |
2372 | if (t > s_t) | |
2373 | s_h = 0; | |
2374 | for (h = s_h; h < MFC_LINES; h++) { | |
a8c9486b | 2375 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { |
cb6a4e46 PM |
2376 | if (e < s_e) |
2377 | goto next_entry; | |
2378 | if (ipmr_fill_mroute(mrt, skb, | |
15e47304 | 2379 | NETLINK_CB(cb->skb).portid, |
cb6a4e46 | 2380 | cb->nlh->nlmsg_seq, |
65886f43 ND |
2381 | mfc, RTM_NEWROUTE, |
2382 | NLM_F_MULTI) < 0) | |
cb6a4e46 PM |
2383 | goto done; |
2384 | next_entry: | |
2385 | e++; | |
2386 | } | |
2387 | e = s_e = 0; | |
2388 | } | |
1eb99af5 ND |
2389 | spin_lock_bh(&mfc_unres_lock); |
2390 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { | |
2391 | if (e < s_e) | |
2392 | goto next_entry2; | |
2393 | if (ipmr_fill_mroute(mrt, skb, | |
2394 | NETLINK_CB(cb->skb).portid, | |
2395 | cb->nlh->nlmsg_seq, | |
65886f43 ND |
2396 | mfc, RTM_NEWROUTE, |
2397 | NLM_F_MULTI) < 0) { | |
1eb99af5 ND |
2398 | spin_unlock_bh(&mfc_unres_lock); |
2399 | goto done; | |
2400 | } | |
2401 | next_entry2: | |
2402 | e++; | |
2403 | } | |
2404 | spin_unlock_bh(&mfc_unres_lock); | |
2405 | e = s_e = 0; | |
cb6a4e46 PM |
2406 | s_h = 0; |
2407 | next_table: | |
2408 | t++; | |
2409 | } | |
2410 | done: | |
a8c9486b | 2411 | rcu_read_unlock(); |
cb6a4e46 PM |
2412 | |
2413 | cb->args[2] = e; | |
2414 | cb->args[1] = h; | |
2415 | cb->args[0] = t; | |
2416 | ||
2417 | return skb->len; | |
2418 | } | |
2419 | ||
e905a9ed | 2420 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2421 | /* |
a8cb16dd ED |
2422 | * The /proc interfaces to multicast routing : |
2423 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 LT |
2424 | */ |
2425 | struct ipmr_vif_iter { | |
f6bb4514 | 2426 | struct seq_net_private p; |
f0ad0860 | 2427 | struct mr_table *mrt; |
1da177e4 LT |
2428 | int ct; |
2429 | }; | |
2430 | ||
f6bb4514 BT |
2431 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2432 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2433 | loff_t pos) |
2434 | { | |
f0ad0860 | 2435 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2436 | |
2437 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2438 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2439 | continue; |
e905a9ed | 2440 | if (pos-- == 0) |
0c12295a | 2441 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2442 | } |
2443 | return NULL; | |
2444 | } | |
2445 | ||
2446 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2447 | __acquires(mrt_lock) |
1da177e4 | 2448 | { |
f0ad0860 | 2449 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2450 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2451 | struct mr_table *mrt; |
2452 | ||
2453 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
51456b29 | 2454 | if (!mrt) |
f0ad0860 PM |
2455 | return ERR_PTR(-ENOENT); |
2456 | ||
2457 | iter->mrt = mrt; | |
f6bb4514 | 2458 | |
1da177e4 | 2459 | read_lock(&mrt_lock); |
f6bb4514 | 2460 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2461 | : SEQ_START_TOKEN; |
2462 | } | |
2463 | ||
2464 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2465 | { | |
2466 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2467 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2468 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2469 | |
2470 | ++*pos; | |
2471 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2472 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2473 | |
0c12295a PM |
2474 | while (++iter->ct < mrt->maxvif) { |
2475 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2476 | continue; |
0c12295a | 2477 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2478 | } |
2479 | return NULL; | |
2480 | } | |
2481 | ||
2482 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2483 | __releases(mrt_lock) |
1da177e4 LT |
2484 | { |
2485 | read_unlock(&mrt_lock); | |
2486 | } | |
2487 | ||
2488 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2489 | { | |
f0ad0860 PM |
2490 | struct ipmr_vif_iter *iter = seq->private; |
2491 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2492 | |
1da177e4 | 2493 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2494 | seq_puts(seq, |
1da177e4 LT |
2495 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2496 | } else { | |
2497 | const struct vif_device *vif = v; | |
2498 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2499 | ||
2500 | seq_printf(seq, | |
2501 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2502 | vif - mrt->vif_table, |
e905a9ed | 2503 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2504 | vif->bytes_out, vif->pkt_out, |
2505 | vif->flags, vif->local, vif->remote); | |
2506 | } | |
2507 | return 0; | |
2508 | } | |
2509 | ||
f690808e | 2510 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2511 | .start = ipmr_vif_seq_start, |
2512 | .next = ipmr_vif_seq_next, | |
2513 | .stop = ipmr_vif_seq_stop, | |
2514 | .show = ipmr_vif_seq_show, | |
2515 | }; | |
2516 | ||
2517 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2518 | { | |
f6bb4514 BT |
2519 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2520 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2521 | } |
2522 | ||
9a32144e | 2523 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2524 | .owner = THIS_MODULE, |
2525 | .open = ipmr_vif_open, | |
2526 | .read = seq_read, | |
2527 | .llseek = seq_lseek, | |
f6bb4514 | 2528 | .release = seq_release_net, |
1da177e4 LT |
2529 | }; |
2530 | ||
2531 | struct ipmr_mfc_iter { | |
f6bb4514 | 2532 | struct seq_net_private p; |
f0ad0860 | 2533 | struct mr_table *mrt; |
862465f2 | 2534 | struct list_head *cache; |
1da177e4 LT |
2535 | int ct; |
2536 | }; | |
2537 | ||
2538 | ||
f6bb4514 BT |
2539 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2540 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2541 | { |
f0ad0860 | 2542 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2543 | struct mfc_cache *mfc; |
2544 | ||
a8c9486b | 2545 | rcu_read_lock(); |
862465f2 | 2546 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2547 | it->cache = &mrt->mfc_cache_array[it->ct]; |
a8c9486b | 2548 | list_for_each_entry_rcu(mfc, it->cache, list) |
e905a9ed | 2549 | if (pos-- == 0) |
1da177e4 | 2550 | return mfc; |
862465f2 | 2551 | } |
a8c9486b | 2552 | rcu_read_unlock(); |
1da177e4 | 2553 | |
1da177e4 | 2554 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2555 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2556 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2557 | if (pos-- == 0) |
1da177e4 LT |
2558 | return mfc; |
2559 | spin_unlock_bh(&mfc_unres_lock); | |
2560 | ||
2561 | it->cache = NULL; | |
2562 | return NULL; | |
2563 | } | |
2564 | ||
2565 | ||
2566 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2567 | { | |
2568 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2569 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2570 | struct mr_table *mrt; |
f6bb4514 | 2571 | |
f0ad0860 | 2572 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
51456b29 | 2573 | if (!mrt) |
f0ad0860 | 2574 | return ERR_PTR(-ENOENT); |
f6bb4514 | 2575 | |
f0ad0860 | 2576 | it->mrt = mrt; |
1da177e4 LT |
2577 | it->cache = NULL; |
2578 | it->ct = 0; | |
f6bb4514 | 2579 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2580 | : SEQ_START_TOKEN; |
2581 | } | |
2582 | ||
2583 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2584 | { | |
2585 | struct mfc_cache *mfc = v; | |
2586 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2587 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2588 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2589 | |
2590 | ++*pos; | |
2591 | ||
2592 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2593 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2594 | |
862465f2 PM |
2595 | if (mfc->list.next != it->cache) |
2596 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2597 | |
0c12295a | 2598 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2599 | goto end_of_list; |
2600 | ||
0c12295a | 2601 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2602 | |
2603 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2604 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2605 | if (list_empty(it->cache)) |
2606 | continue; | |
2607 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2608 | } |
2609 | ||
2610 | /* exhausted cache_array, show unresolved */ | |
a8c9486b | 2611 | rcu_read_unlock(); |
0c12295a | 2612 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2613 | it->ct = 0; |
e905a9ed | 2614 | |
1da177e4 | 2615 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2616 | if (!list_empty(it->cache)) |
2617 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 | 2618 | |
a8cb16dd | 2619 | end_of_list: |
1da177e4 LT |
2620 | spin_unlock_bh(&mfc_unres_lock); |
2621 | it->cache = NULL; | |
2622 | ||
2623 | return NULL; | |
2624 | } | |
2625 | ||
2626 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2627 | { | |
2628 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2629 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2630 | |
0c12295a | 2631 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2632 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2633 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
a8c9486b | 2634 | rcu_read_unlock(); |
1da177e4 LT |
2635 | } |
2636 | ||
2637 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2638 | { | |
2639 | int n; | |
2640 | ||
2641 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2642 | seq_puts(seq, |
1da177e4 LT |
2643 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2644 | } else { | |
2645 | const struct mfc_cache *mfc = v; | |
2646 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2647 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2648 | |
0eae88f3 ED |
2649 | seq_printf(seq, "%08X %08X %-3hd", |
2650 | (__force u32) mfc->mfc_mcastgrp, | |
2651 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2652 | mfc->mfc_parent); |
1da177e4 | 2653 | |
0c12295a | 2654 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2655 | seq_printf(seq, " %8lu %8lu %8lu", |
2656 | mfc->mfc_un.res.pkt, | |
2657 | mfc->mfc_un.res.bytes, | |
2658 | mfc->mfc_un.res.wrong_if); | |
132adf54 | 2659 | for (n = mfc->mfc_un.res.minvif; |
a8cb16dd | 2660 | n < mfc->mfc_un.res.maxvif; n++) { |
0c12295a | 2661 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2662 | mfc->mfc_un.res.ttls[n] < 255) |
2663 | seq_printf(seq, | |
e905a9ed | 2664 | " %2d:%-3d", |
1da177e4 LT |
2665 | n, mfc->mfc_un.res.ttls[n]); |
2666 | } | |
1ea472e2 BT |
2667 | } else { |
2668 | /* unresolved mfc_caches don't contain | |
2669 | * pkt, bytes and wrong_if values | |
2670 | */ | |
2671 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2672 | } |
2673 | seq_putc(seq, '\n'); | |
2674 | } | |
2675 | return 0; | |
2676 | } | |
2677 | ||
f690808e | 2678 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2679 | .start = ipmr_mfc_seq_start, |
2680 | .next = ipmr_mfc_seq_next, | |
2681 | .stop = ipmr_mfc_seq_stop, | |
2682 | .show = ipmr_mfc_seq_show, | |
2683 | }; | |
2684 | ||
2685 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2686 | { | |
f6bb4514 BT |
2687 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2688 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2689 | } |
2690 | ||
9a32144e | 2691 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2692 | .owner = THIS_MODULE, |
2693 | .open = ipmr_mfc_open, | |
2694 | .read = seq_read, | |
2695 | .llseek = seq_lseek, | |
f6bb4514 | 2696 | .release = seq_release_net, |
1da177e4 | 2697 | }; |
e905a9ed | 2698 | #endif |
1da177e4 LT |
2699 | |
2700 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2701 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2702 | .handler = pim_rcv, |
403dbb97 | 2703 | .netns_ok = 1, |
1da177e4 LT |
2704 | }; |
2705 | #endif | |
2706 | ||
2707 | ||
2708 | /* | |
2709 | * Setup for IP multicast routing | |
2710 | */ | |
cf958ae3 BT |
2711 | static int __net_init ipmr_net_init(struct net *net) |
2712 | { | |
f0ad0860 | 2713 | int err; |
cf958ae3 | 2714 | |
f0ad0860 PM |
2715 | err = ipmr_rules_init(net); |
2716 | if (err < 0) | |
cf958ae3 | 2717 | goto fail; |
f6bb4514 BT |
2718 | |
2719 | #ifdef CONFIG_PROC_FS | |
2720 | err = -ENOMEM; | |
d4beaa66 | 2721 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 2722 | goto proc_vif_fail; |
d4beaa66 | 2723 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
2724 | goto proc_cache_fail; |
2725 | #endif | |
2bb8b26c BT |
2726 | return 0; |
2727 | ||
f6bb4514 BT |
2728 | #ifdef CONFIG_PROC_FS |
2729 | proc_cache_fail: | |
ece31ffd | 2730 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 2731 | proc_vif_fail: |
f0ad0860 | 2732 | ipmr_rules_exit(net); |
f6bb4514 | 2733 | #endif |
cf958ae3 BT |
2734 | fail: |
2735 | return err; | |
2736 | } | |
2737 | ||
2738 | static void __net_exit ipmr_net_exit(struct net *net) | |
2739 | { | |
f6bb4514 | 2740 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
2741 | remove_proc_entry("ip_mr_cache", net->proc_net); |
2742 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 2743 | #endif |
f0ad0860 | 2744 | ipmr_rules_exit(net); |
cf958ae3 BT |
2745 | } |
2746 | ||
2747 | static struct pernet_operations ipmr_net_ops = { | |
2748 | .init = ipmr_net_init, | |
2749 | .exit = ipmr_net_exit, | |
2750 | }; | |
e905a9ed | 2751 | |
03d2f897 | 2752 | int __init ip_mr_init(void) |
1da177e4 | 2753 | { |
03d2f897 WC |
2754 | int err; |
2755 | ||
1da177e4 LT |
2756 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2757 | sizeof(struct mfc_cache), | |
a8c9486b | 2758 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 2759 | NULL); |
03d2f897 WC |
2760 | if (!mrt_cachep) |
2761 | return -ENOMEM; | |
2762 | ||
cf958ae3 BT |
2763 | err = register_pernet_subsys(&ipmr_net_ops); |
2764 | if (err) | |
2765 | goto reg_pernet_fail; | |
2766 | ||
03d2f897 WC |
2767 | err = register_netdevice_notifier(&ip_mr_notifier); |
2768 | if (err) | |
2769 | goto reg_notif_fail; | |
403dbb97 TG |
2770 | #ifdef CONFIG_IP_PIMSM_V2 |
2771 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 2772 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
2773 | err = -EAGAIN; |
2774 | goto add_proto_fail; | |
2775 | } | |
2776 | #endif | |
c7ac8679 GR |
2777 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
2778 | NULL, ipmr_rtm_dumproute, NULL); | |
03d2f897 | 2779 | return 0; |
f6bb4514 | 2780 | |
403dbb97 TG |
2781 | #ifdef CONFIG_IP_PIMSM_V2 |
2782 | add_proto_fail: | |
2783 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2784 | #endif | |
c3e38896 | 2785 | reg_notif_fail: |
cf958ae3 BT |
2786 | unregister_pernet_subsys(&ipmr_net_ops); |
2787 | reg_pernet_fail: | |
c3e38896 | 2788 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2789 | return err; |
1da177e4 | 2790 | } |