Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
113aa838 | 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * Linux Consultancy and Custom Driver Development |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
1da177e4 LT |
12 | * Fixes: |
13 | * Michael Chastain : Incorrect size of copying. | |
14 | * Alan Cox : Added the cache manager code | |
15 | * Alan Cox : Fixed the clone/copy bug and device race. | |
16 | * Mike McLagan : Routing by source | |
17 | * Malcolm Beattie : Buffer handling fixes. | |
18 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
19 | * SVR Anand : Fixed several multicast bugs and problems. | |
20 | * Alexey Kuznetsov : Status, optimisations and more. | |
21 | * Brad Parker : Better behaviour on mrouted upcall | |
22 | * overflow. | |
23 | * Carlos Picoto : PIMv1 Support | |
24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
f77f13e2 | 25 | * Relax this requirement to work with older peers. |
1da177e4 LT |
26 | * |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | #include <linux/types.h> | |
4fc268d2 | 31 | #include <linux/capability.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/timer.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/stat.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/in.h> | |
40 | #include <linux/inet.h> | |
41 | #include <linux/netdevice.h> | |
42 | #include <linux/inetdevice.h> | |
43 | #include <linux/igmp.h> | |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/seq_file.h> | |
46 | #include <linux/mroute.h> | |
47 | #include <linux/init.h> | |
46f25dff | 48 | #include <linux/if_ether.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
457c4cbc | 50 | #include <net/net_namespace.h> |
1da177e4 LT |
51 | #include <net/ip.h> |
52 | #include <net/protocol.h> | |
53 | #include <linux/skbuff.h> | |
14c85021 | 54 | #include <net/route.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/icmp.h> | |
57 | #include <net/udp.h> | |
58 | #include <net/raw.h> | |
59 | #include <linux/notifier.h> | |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/netfilter_ipv4.h> | |
709b46e8 | 62 | #include <linux/compat.h> |
bc3b2d7f | 63 | #include <linux/export.h> |
c5441932 | 64 | #include <net/ip_tunnels.h> |
1da177e4 | 65 | #include <net/checksum.h> |
dc5fc579 | 66 | #include <net/netlink.h> |
f0ad0860 | 67 | #include <net/fib_rules.h> |
d67b8c61 | 68 | #include <linux/netconf.h> |
1da177e4 LT |
69 | |
70 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
71 | #define CONFIG_IP_PIMSM 1 | |
72 | #endif | |
73 | ||
0c12295a | 74 | struct mr_table { |
f0ad0860 | 75 | struct list_head list; |
0c5c9fb5 | 76 | possible_net_t net; |
f0ad0860 | 77 | u32 id; |
4c968709 | 78 | struct sock __rcu *mroute_sk; |
0c12295a PM |
79 | struct timer_list ipmr_expire_timer; |
80 | struct list_head mfc_unres_queue; | |
81 | struct list_head mfc_cache_array[MFC_LINES]; | |
82 | struct vif_device vif_table[MAXVIFS]; | |
83 | int maxvif; | |
84 | atomic_t cache_resolve_queue_len; | |
53d6841d JP |
85 | bool mroute_do_assert; |
86 | bool mroute_do_pim; | |
0c12295a PM |
87 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
88 | int mroute_reg_vif_num; | |
89 | #endif | |
90 | }; | |
91 | ||
f0ad0860 PM |
92 | struct ipmr_rule { |
93 | struct fib_rule common; | |
94 | }; | |
95 | ||
96 | struct ipmr_result { | |
97 | struct mr_table *mrt; | |
98 | }; | |
99 | ||
1da177e4 | 100 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 101 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
102 | */ |
103 | ||
104 | static DEFINE_RWLOCK(mrt_lock); | |
105 | ||
106 | /* | |
107 | * Multicast router control variables | |
108 | */ | |
109 | ||
0c12295a | 110 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 LT |
111 | |
112 | /* Special spinlock for queue of unresolved entries */ | |
113 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
114 | ||
115 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
116 | * entries is changed only in process context and protected |
117 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
118 | * with strong spinlock mfc_unres_lock. | |
119 | * | |
120 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
121 | */ |
122 | ||
e18b890b | 123 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 124 | |
f0ad0860 | 125 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
126 | static void ipmr_free_table(struct mr_table *mrt); |
127 | ||
c4854ec8 RR |
128 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
129 | struct sk_buff *skb, struct mfc_cache *cache, | |
130 | int local); | |
0c12295a | 131 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 132 | struct sk_buff *pkt, vifi_t vifi, int assert); |
cb6a4e46 PM |
133 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
134 | struct mfc_cache *c, struct rtmsg *rtm); | |
8cd3ac9f ND |
135 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
136 | int cmd); | |
acbb219d | 137 | static void mroute_clean_tables(struct mr_table *mrt); |
f0ad0860 PM |
138 | static void ipmr_expire_process(unsigned long arg); |
139 | ||
140 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
141 | #define ipmr_for_each_table(mrt, net) \ | |
142 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
143 | ||
144 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
145 | { | |
146 | struct mr_table *mrt; | |
147 | ||
148 | ipmr_for_each_table(mrt, net) { | |
149 | if (mrt->id == id) | |
150 | return mrt; | |
151 | } | |
152 | return NULL; | |
153 | } | |
154 | ||
da91981b | 155 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
156 | struct mr_table **mrt) |
157 | { | |
f0ad0860 | 158 | int err; |
95f4a45d HFS |
159 | struct ipmr_result res; |
160 | struct fib_lookup_arg arg = { | |
161 | .result = &res, | |
162 | .flags = FIB_LOOKUP_NOREF, | |
163 | }; | |
f0ad0860 | 164 | |
da91981b DM |
165 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
166 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
167 | if (err < 0) |
168 | return err; | |
169 | *mrt = res.mrt; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
174 | int flags, struct fib_lookup_arg *arg) | |
175 | { | |
176 | struct ipmr_result *res = arg->result; | |
177 | struct mr_table *mrt; | |
1da177e4 | 178 | |
f0ad0860 PM |
179 | switch (rule->action) { |
180 | case FR_ACT_TO_TBL: | |
181 | break; | |
182 | case FR_ACT_UNREACHABLE: | |
183 | return -ENETUNREACH; | |
184 | case FR_ACT_PROHIBIT: | |
185 | return -EACCES; | |
186 | case FR_ACT_BLACKHOLE: | |
187 | default: | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
192 | if (mrt == NULL) | |
193 | return -EAGAIN; | |
194 | res->mrt = mrt; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
199 | { | |
200 | return 1; | |
201 | } | |
202 | ||
203 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
204 | FRA_GENERIC_POLICY, | |
205 | }; | |
206 | ||
207 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
208 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
214 | struct nlattr **tb) | |
215 | { | |
216 | return 1; | |
217 | } | |
218 | ||
219 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
220 | struct fib_rule_hdr *frh) | |
221 | { | |
222 | frh->dst_len = 0; | |
223 | frh->src_len = 0; | |
224 | frh->tos = 0; | |
225 | return 0; | |
226 | } | |
227 | ||
04a6f82c | 228 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 229 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
230 | .rule_size = sizeof(struct ipmr_rule), |
231 | .addr_size = sizeof(u32), | |
232 | .action = ipmr_rule_action, | |
233 | .match = ipmr_rule_match, | |
234 | .configure = ipmr_rule_configure, | |
235 | .compare = ipmr_rule_compare, | |
236 | .default_pref = fib_default_rule_pref, | |
237 | .fill = ipmr_rule_fill, | |
238 | .nlgroup = RTNLGRP_IPV4_RULE, | |
239 | .policy = ipmr_rule_policy, | |
240 | .owner = THIS_MODULE, | |
241 | }; | |
242 | ||
243 | static int __net_init ipmr_rules_init(struct net *net) | |
244 | { | |
245 | struct fib_rules_ops *ops; | |
246 | struct mr_table *mrt; | |
247 | int err; | |
248 | ||
249 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
250 | if (IS_ERR(ops)) | |
251 | return PTR_ERR(ops); | |
252 | ||
253 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
254 | ||
255 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
256 | if (mrt == NULL) { | |
257 | err = -ENOMEM; | |
258 | goto err1; | |
259 | } | |
260 | ||
261 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
262 | if (err < 0) | |
263 | goto err2; | |
264 | ||
265 | net->ipv4.mr_rules_ops = ops; | |
266 | return 0; | |
267 | ||
268 | err2: | |
269 | kfree(mrt); | |
270 | err1: | |
271 | fib_rules_unregister(ops); | |
272 | return err; | |
273 | } | |
274 | ||
275 | static void __net_exit ipmr_rules_exit(struct net *net) | |
276 | { | |
277 | struct mr_table *mrt, *next; | |
278 | ||
035320d5 ED |
279 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
280 | list_del(&mrt->list); | |
acbb219d | 281 | ipmr_free_table(mrt); |
035320d5 | 282 | } |
f0ad0860 PM |
283 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
284 | } | |
285 | #else | |
286 | #define ipmr_for_each_table(mrt, net) \ | |
287 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
288 | ||
289 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
290 | { | |
291 | return net->ipv4.mrt; | |
292 | } | |
293 | ||
da91981b | 294 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
295 | struct mr_table **mrt) |
296 | { | |
297 | *mrt = net->ipv4.mrt; | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int __net_init ipmr_rules_init(struct net *net) | |
302 | { | |
303 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
304 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
305 | } | |
306 | ||
307 | static void __net_exit ipmr_rules_exit(struct net *net) | |
308 | { | |
acbb219d | 309 | ipmr_free_table(net->ipv4.mrt); |
f0ad0860 PM |
310 | } |
311 | #endif | |
312 | ||
313 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
314 | { | |
315 | struct mr_table *mrt; | |
316 | unsigned int i; | |
1da177e4 | 317 | |
f0ad0860 PM |
318 | mrt = ipmr_get_table(net, id); |
319 | if (mrt != NULL) | |
320 | return mrt; | |
321 | ||
322 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
323 | if (mrt == NULL) | |
324 | return NULL; | |
8de53dfb | 325 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
326 | mrt->id = id; |
327 | ||
328 | /* Forwarding cache */ | |
329 | for (i = 0; i < MFC_LINES; i++) | |
330 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
331 | ||
332 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
333 | ||
334 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
335 | (unsigned long)mrt); | |
336 | ||
337 | #ifdef CONFIG_IP_PIMSM | |
338 | mrt->mroute_reg_vif_num = -1; | |
339 | #endif | |
340 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
341 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
342 | #endif | |
343 | return mrt; | |
344 | } | |
1da177e4 | 345 | |
acbb219d FR |
346 | static void ipmr_free_table(struct mr_table *mrt) |
347 | { | |
348 | del_timer_sync(&mrt->ipmr_expire_timer); | |
349 | mroute_clean_tables(mrt); | |
350 | kfree(mrt); | |
351 | } | |
352 | ||
1da177e4 LT |
353 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
354 | ||
d607032d WC |
355 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
356 | { | |
4feb88e5 BT |
357 | struct net *net = dev_net(dev); |
358 | ||
d607032d WC |
359 | dev_close(dev); |
360 | ||
4feb88e5 | 361 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 362 | if (dev) { |
5bc3eb7e | 363 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 364 | struct ifreq ifr; |
d607032d WC |
365 | struct ip_tunnel_parm p; |
366 | ||
367 | memset(&p, 0, sizeof(p)); | |
368 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
369 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
370 | p.iph.version = 4; | |
371 | p.iph.ihl = 5; | |
372 | p.iph.protocol = IPPROTO_IPIP; | |
373 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
374 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
375 | ||
5bc3eb7e SH |
376 | if (ops->ndo_do_ioctl) { |
377 | mm_segment_t oldfs = get_fs(); | |
378 | ||
379 | set_fs(KERNEL_DS); | |
380 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
381 | set_fs(oldfs); | |
382 | } | |
d607032d WC |
383 | } |
384 | } | |
385 | ||
1da177e4 | 386 | static |
4feb88e5 | 387 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
388 | { |
389 | struct net_device *dev; | |
390 | ||
4feb88e5 | 391 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
392 | |
393 | if (dev) { | |
5bc3eb7e | 394 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
395 | int err; |
396 | struct ifreq ifr; | |
1da177e4 LT |
397 | struct ip_tunnel_parm p; |
398 | struct in_device *in_dev; | |
399 | ||
400 | memset(&p, 0, sizeof(p)); | |
401 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
402 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
403 | p.iph.version = 4; | |
404 | p.iph.ihl = 5; | |
405 | p.iph.protocol = IPPROTO_IPIP; | |
406 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 407 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 408 | |
5bc3eb7e SH |
409 | if (ops->ndo_do_ioctl) { |
410 | mm_segment_t oldfs = get_fs(); | |
411 | ||
412 | set_fs(KERNEL_DS); | |
413 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
414 | set_fs(oldfs); | |
a8cb16dd | 415 | } else { |
5bc3eb7e | 416 | err = -EOPNOTSUPP; |
a8cb16dd | 417 | } |
1da177e4 LT |
418 | dev = NULL; |
419 | ||
4feb88e5 BT |
420 | if (err == 0 && |
421 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
422 | dev->flags |= IFF_MULTICAST; |
423 | ||
e5ed6399 | 424 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 425 | if (in_dev == NULL) |
1da177e4 | 426 | goto failure; |
71e27da9 HX |
427 | |
428 | ipv4_devconf_setall(in_dev); | |
1d4c8c29 | 429 | neigh_parms_data_state_setall(in_dev->arp_parms); |
71e27da9 | 430 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
1da177e4 LT |
431 | |
432 | if (dev_open(dev)) | |
433 | goto failure; | |
7dc00c82 | 434 | dev_hold(dev); |
1da177e4 LT |
435 | } |
436 | } | |
437 | return dev; | |
438 | ||
439 | failure: | |
440 | /* allow the register to be completed before unregistering. */ | |
441 | rtnl_unlock(); | |
442 | rtnl_lock(); | |
443 | ||
444 | unregister_netdevice(dev); | |
445 | return NULL; | |
446 | } | |
447 | ||
448 | #ifdef CONFIG_IP_PIMSM | |
449 | ||
6fef4c0c | 450 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 451 | { |
4feb88e5 | 452 | struct net *net = dev_net(dev); |
f0ad0860 | 453 | struct mr_table *mrt; |
da91981b DM |
454 | struct flowi4 fl4 = { |
455 | .flowi4_oif = dev->ifindex, | |
6a662719 | 456 | .flowi4_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, |
da91981b | 457 | .flowi4_mark = skb->mark, |
f0ad0860 PM |
458 | }; |
459 | int err; | |
460 | ||
da91981b | 461 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
462 | if (err < 0) { |
463 | kfree_skb(skb); | |
f0ad0860 | 464 | return err; |
e40dbc51 | 465 | } |
4feb88e5 | 466 | |
1da177e4 | 467 | read_lock(&mrt_lock); |
cf3677ae PE |
468 | dev->stats.tx_bytes += skb->len; |
469 | dev->stats.tx_packets++; | |
0c12295a | 470 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
471 | read_unlock(&mrt_lock); |
472 | kfree_skb(skb); | |
6ed10654 | 473 | return NETDEV_TX_OK; |
1da177e4 LT |
474 | } |
475 | ||
007c3838 SH |
476 | static const struct net_device_ops reg_vif_netdev_ops = { |
477 | .ndo_start_xmit = reg_vif_xmit, | |
478 | }; | |
479 | ||
1da177e4 LT |
480 | static void reg_vif_setup(struct net_device *dev) |
481 | { | |
482 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 483 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 484 | dev->flags = IFF_NOARP; |
70cb4a45 | 485 | dev->netdev_ops = ®_vif_netdev_ops; |
1da177e4 | 486 | dev->destructor = free_netdev; |
403dbb97 | 487 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
488 | } |
489 | ||
f0ad0860 | 490 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
491 | { |
492 | struct net_device *dev; | |
493 | struct in_device *in_dev; | |
f0ad0860 | 494 | char name[IFNAMSIZ]; |
1da177e4 | 495 | |
f0ad0860 PM |
496 | if (mrt->id == RT_TABLE_DEFAULT) |
497 | sprintf(name, "pimreg"); | |
498 | else | |
499 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 500 | |
c835a677 | 501 | dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); |
1da177e4 LT |
502 | |
503 | if (dev == NULL) | |
504 | return NULL; | |
505 | ||
403dbb97 TG |
506 | dev_net_set(dev, net); |
507 | ||
1da177e4 LT |
508 | if (register_netdevice(dev)) { |
509 | free_netdev(dev); | |
510 | return NULL; | |
511 | } | |
512 | dev->iflink = 0; | |
513 | ||
71e27da9 | 514 | rcu_read_lock(); |
a8cb16dd ED |
515 | in_dev = __in_dev_get_rcu(dev); |
516 | if (!in_dev) { | |
71e27da9 | 517 | rcu_read_unlock(); |
1da177e4 | 518 | goto failure; |
71e27da9 | 519 | } |
1da177e4 | 520 | |
71e27da9 | 521 | ipv4_devconf_setall(in_dev); |
1d4c8c29 | 522 | neigh_parms_data_state_setall(in_dev->arp_parms); |
71e27da9 HX |
523 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; |
524 | rcu_read_unlock(); | |
1da177e4 LT |
525 | |
526 | if (dev_open(dev)) | |
527 | goto failure; | |
528 | ||
7dc00c82 WC |
529 | dev_hold(dev); |
530 | ||
1da177e4 LT |
531 | return dev; |
532 | ||
533 | failure: | |
534 | /* allow the register to be completed before unregistering. */ | |
535 | rtnl_unlock(); | |
536 | rtnl_lock(); | |
537 | ||
538 | unregister_netdevice(dev); | |
539 | return NULL; | |
540 | } | |
541 | #endif | |
542 | ||
2c53040f BH |
543 | /** |
544 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 545 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 546 | */ |
e905a9ed | 547 | |
0c12295a | 548 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 549 | struct list_head *head) |
1da177e4 LT |
550 | { |
551 | struct vif_device *v; | |
552 | struct net_device *dev; | |
553 | struct in_device *in_dev; | |
554 | ||
0c12295a | 555 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
556 | return -EADDRNOTAVAIL; |
557 | ||
0c12295a | 558 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
559 | |
560 | write_lock_bh(&mrt_lock); | |
561 | dev = v->dev; | |
562 | v->dev = NULL; | |
563 | ||
564 | if (!dev) { | |
565 | write_unlock_bh(&mrt_lock); | |
566 | return -EADDRNOTAVAIL; | |
567 | } | |
568 | ||
569 | #ifdef CONFIG_IP_PIMSM | |
0c12295a PM |
570 | if (vifi == mrt->mroute_reg_vif_num) |
571 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 LT |
572 | #endif |
573 | ||
a8cb16dd | 574 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 575 | int tmp; |
a8cb16dd ED |
576 | |
577 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 578 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
579 | break; |
580 | } | |
0c12295a | 581 | mrt->maxvif = tmp+1; |
1da177e4 LT |
582 | } |
583 | ||
584 | write_unlock_bh(&mrt_lock); | |
585 | ||
586 | dev_set_allmulti(dev, -1); | |
587 | ||
a8cb16dd ED |
588 | in_dev = __in_dev_get_rtnl(dev); |
589 | if (in_dev) { | |
42f811b8 | 590 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
d67b8c61 ND |
591 | inet_netconf_notify_devconf(dev_net(dev), |
592 | NETCONFA_MC_FORWARDING, | |
593 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
594 | ip_rt_multicast_event(in_dev); |
595 | } | |
596 | ||
a8cb16dd | 597 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 598 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
599 | |
600 | dev_put(dev); | |
601 | return 0; | |
602 | } | |
603 | ||
a8c9486b | 604 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 605 | { |
a8c9486b ED |
606 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
607 | ||
5c0a66f5 BT |
608 | kmem_cache_free(mrt_cachep, c); |
609 | } | |
610 | ||
a8c9486b ED |
611 | static inline void ipmr_cache_free(struct mfc_cache *c) |
612 | { | |
613 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
614 | } | |
615 | ||
1da177e4 | 616 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 617 | * and reporting error to netlink readers. |
1da177e4 LT |
618 | */ |
619 | ||
0c12295a | 620 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 621 | { |
8de53dfb | 622 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 623 | struct sk_buff *skb; |
9ef1d4c7 | 624 | struct nlmsgerr *e; |
1da177e4 | 625 | |
0c12295a | 626 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 627 | |
c354e124 | 628 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 629 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
630 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
631 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 632 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 633 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 634 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
635 | e->error = -ETIMEDOUT; |
636 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 637 | |
15e47304 | 638 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 639 | } else { |
1da177e4 | 640 | kfree_skb(skb); |
a8cb16dd | 641 | } |
1da177e4 LT |
642 | } |
643 | ||
5c0a66f5 | 644 | ipmr_cache_free(c); |
1da177e4 LT |
645 | } |
646 | ||
647 | ||
e258beb2 | 648 | /* Timer process for the unresolved queue. */ |
1da177e4 | 649 | |
e258beb2 | 650 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 651 | { |
0c12295a | 652 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
653 | unsigned long now; |
654 | unsigned long expires; | |
862465f2 | 655 | struct mfc_cache *c, *next; |
1da177e4 LT |
656 | |
657 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 658 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
659 | return; |
660 | } | |
661 | ||
0c12295a | 662 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
663 | goto out; |
664 | ||
665 | now = jiffies; | |
666 | expires = 10*HZ; | |
1da177e4 | 667 | |
0c12295a | 668 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
669 | if (time_after(c->mfc_un.unres.expires, now)) { |
670 | unsigned long interval = c->mfc_un.unres.expires - now; | |
671 | if (interval < expires) | |
672 | expires = interval; | |
1da177e4 LT |
673 | continue; |
674 | } | |
675 | ||
862465f2 | 676 | list_del(&c->list); |
8cd3ac9f | 677 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 678 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
679 | } |
680 | ||
0c12295a PM |
681 | if (!list_empty(&mrt->mfc_unres_queue)) |
682 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
683 | |
684 | out: | |
685 | spin_unlock(&mfc_unres_lock); | |
686 | } | |
687 | ||
688 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
689 | ||
0c12295a | 690 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 691 | unsigned char *ttls) |
1da177e4 LT |
692 | { |
693 | int vifi; | |
694 | ||
695 | cache->mfc_un.res.minvif = MAXVIFS; | |
696 | cache->mfc_un.res.maxvif = 0; | |
697 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
698 | ||
0c12295a PM |
699 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
700 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 701 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
702 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
703 | if (cache->mfc_un.res.minvif > vifi) | |
704 | cache->mfc_un.res.minvif = vifi; | |
705 | if (cache->mfc_un.res.maxvif <= vifi) | |
706 | cache->mfc_un.res.maxvif = vifi + 1; | |
707 | } | |
708 | } | |
709 | } | |
710 | ||
0c12295a PM |
711 | static int vif_add(struct net *net, struct mr_table *mrt, |
712 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
713 | { |
714 | int vifi = vifc->vifc_vifi; | |
0c12295a | 715 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
716 | struct net_device *dev; |
717 | struct in_device *in_dev; | |
d607032d | 718 | int err; |
1da177e4 LT |
719 | |
720 | /* Is vif busy ? */ | |
0c12295a | 721 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
722 | return -EADDRINUSE; |
723 | ||
724 | switch (vifc->vifc_flags) { | |
725 | #ifdef CONFIG_IP_PIMSM | |
726 | case VIFF_REGISTER: | |
727 | /* | |
728 | * Special Purpose VIF in PIM | |
729 | * All the packets will be sent to the daemon | |
730 | */ | |
0c12295a | 731 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 732 | return -EADDRINUSE; |
f0ad0860 | 733 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
734 | if (!dev) |
735 | return -ENOBUFS; | |
d607032d WC |
736 | err = dev_set_allmulti(dev, 1); |
737 | if (err) { | |
738 | unregister_netdevice(dev); | |
7dc00c82 | 739 | dev_put(dev); |
d607032d WC |
740 | return err; |
741 | } | |
1da177e4 LT |
742 | break; |
743 | #endif | |
e905a9ed | 744 | case VIFF_TUNNEL: |
4feb88e5 | 745 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
746 | if (!dev) |
747 | return -ENOBUFS; | |
d607032d WC |
748 | err = dev_set_allmulti(dev, 1); |
749 | if (err) { | |
750 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 751 | dev_put(dev); |
d607032d WC |
752 | return err; |
753 | } | |
1da177e4 | 754 | break; |
ee5e81f0 I |
755 | |
756 | case VIFF_USE_IFINDEX: | |
1da177e4 | 757 | case 0: |
ee5e81f0 I |
758 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
759 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
95ae6b22 | 760 | if (dev && __in_dev_get_rtnl(dev) == NULL) { |
ee5e81f0 I |
761 | dev_put(dev); |
762 | return -EADDRNOTAVAIL; | |
763 | } | |
a8cb16dd | 764 | } else { |
ee5e81f0 | 765 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 766 | } |
1da177e4 LT |
767 | if (!dev) |
768 | return -EADDRNOTAVAIL; | |
d607032d | 769 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
770 | if (err) { |
771 | dev_put(dev); | |
d607032d | 772 | return err; |
7dc00c82 | 773 | } |
1da177e4 LT |
774 | break; |
775 | default: | |
776 | return -EINVAL; | |
777 | } | |
778 | ||
a8cb16dd ED |
779 | in_dev = __in_dev_get_rtnl(dev); |
780 | if (!in_dev) { | |
d0490cfd | 781 | dev_put(dev); |
1da177e4 | 782 | return -EADDRNOTAVAIL; |
d0490cfd | 783 | } |
42f811b8 | 784 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
d67b8c61 ND |
785 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex, |
786 | &in_dev->cnf); | |
1da177e4 LT |
787 | ip_rt_multicast_event(in_dev); |
788 | ||
a8cb16dd ED |
789 | /* Fill in the VIF structures */ |
790 | ||
c354e124 JK |
791 | v->rate_limit = vifc->vifc_rate_limit; |
792 | v->local = vifc->vifc_lcl_addr.s_addr; | |
793 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
794 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
795 | if (!mrtsock) |
796 | v->flags |= VIFF_STATIC; | |
c354e124 | 797 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
798 | v->bytes_in = 0; |
799 | v->bytes_out = 0; | |
800 | v->pkt_in = 0; | |
801 | v->pkt_out = 0; | |
802 | v->link = dev->ifindex; | |
a8cb16dd | 803 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
1da177e4 LT |
804 | v->link = dev->iflink; |
805 | ||
806 | /* And finish update writing critical data */ | |
807 | write_lock_bh(&mrt_lock); | |
c354e124 | 808 | v->dev = dev; |
1da177e4 | 809 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 810 | if (v->flags & VIFF_REGISTER) |
0c12295a | 811 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 812 | #endif |
0c12295a PM |
813 | if (vifi+1 > mrt->maxvif) |
814 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
815 | write_unlock_bh(&mrt_lock); |
816 | return 0; | |
817 | } | |
818 | ||
a8c9486b | 819 | /* called with rcu_read_lock() */ |
0c12295a | 820 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
821 | __be32 origin, |
822 | __be32 mcastgrp) | |
1da177e4 | 823 | { |
c354e124 | 824 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
825 | struct mfc_cache *c; |
826 | ||
a8c9486b | 827 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
828 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
829 | return c; | |
1da177e4 | 830 | } |
862465f2 | 831 | return NULL; |
1da177e4 LT |
832 | } |
833 | ||
660b26dc ND |
834 | /* Look for a (*,*,oif) entry */ |
835 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, | |
836 | int vifi) | |
837 | { | |
360eb5da | 838 | int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY)); |
660b26dc ND |
839 | struct mfc_cache *c; |
840 | ||
841 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da ND |
842 | if (c->mfc_origin == htonl(INADDR_ANY) && |
843 | c->mfc_mcastgrp == htonl(INADDR_ANY) && | |
660b26dc ND |
844 | c->mfc_un.res.ttls[vifi] < 255) |
845 | return c; | |
846 | ||
847 | return NULL; | |
848 | } | |
849 | ||
850 | /* Look for a (*,G) entry */ | |
851 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
852 | __be32 mcastgrp, int vifi) | |
853 | { | |
360eb5da | 854 | int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY)); |
660b26dc ND |
855 | struct mfc_cache *c, *proxy; |
856 | ||
360eb5da | 857 | if (mcastgrp == htonl(INADDR_ANY)) |
660b26dc ND |
858 | goto skip; |
859 | ||
860 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da | 861 | if (c->mfc_origin == htonl(INADDR_ANY) && |
660b26dc ND |
862 | c->mfc_mcastgrp == mcastgrp) { |
863 | if (c->mfc_un.res.ttls[vifi] < 255) | |
864 | return c; | |
865 | ||
866 | /* It's ok if the vifi is part of the static tree */ | |
867 | proxy = ipmr_cache_find_any_parent(mrt, | |
868 | c->mfc_parent); | |
869 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) | |
870 | return c; | |
871 | } | |
872 | ||
873 | skip: | |
874 | return ipmr_cache_find_any_parent(mrt, vifi); | |
875 | } | |
876 | ||
1da177e4 LT |
877 | /* |
878 | * Allocate a multicast cache entry | |
879 | */ | |
d658f8a0 | 880 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 881 | { |
c354e124 | 882 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b ED |
883 | |
884 | if (c) | |
885 | c->mfc_un.res.minvif = MAXVIFS; | |
1da177e4 LT |
886 | return c; |
887 | } | |
888 | ||
d658f8a0 | 889 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 890 | { |
c354e124 | 891 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
892 | |
893 | if (c) { | |
894 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
895 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
896 | } | |
1da177e4 LT |
897 | return c; |
898 | } | |
899 | ||
900 | /* | |
901 | * A cache entry has gone into a resolved state from queued | |
902 | */ | |
e905a9ed | 903 | |
0c12295a PM |
904 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
905 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
906 | { |
907 | struct sk_buff *skb; | |
9ef1d4c7 | 908 | struct nlmsgerr *e; |
1da177e4 | 909 | |
a8cb16dd | 910 | /* Play the pending entries through our router */ |
1da177e4 | 911 | |
c354e124 | 912 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 913 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
914 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
915 | ||
573ce260 | 916 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
a8cb16dd ED |
917 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
918 | (u8 *)nlh; | |
1da177e4 LT |
919 | } else { |
920 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 921 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 922 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 923 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
924 | e->error = -EMSGSIZE; |
925 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 926 | } |
2942e900 | 927 | |
15e47304 | 928 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 929 | } else { |
0c12295a | 930 | ip_mr_forward(net, mrt, skb, c, 0); |
a8cb16dd | 931 | } |
1da177e4 LT |
932 | } |
933 | } | |
934 | ||
935 | /* | |
936 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
937 | * expects the following bizarre scheme. | |
938 | * | |
939 | * Called under mrt_lock. | |
940 | */ | |
e905a9ed | 941 | |
0c12295a | 942 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 943 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
944 | { |
945 | struct sk_buff *skb; | |
c9bdd4b5 | 946 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
947 | struct igmphdr *igmp; |
948 | struct igmpmsg *msg; | |
4c968709 | 949 | struct sock *mroute_sk; |
1da177e4 LT |
950 | int ret; |
951 | ||
952 | #ifdef CONFIG_IP_PIMSM | |
953 | if (assert == IGMPMSG_WHOLEPKT) | |
954 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
955 | else | |
956 | #endif | |
957 | skb = alloc_skb(128, GFP_ATOMIC); | |
958 | ||
132adf54 | 959 | if (!skb) |
1da177e4 LT |
960 | return -ENOBUFS; |
961 | ||
962 | #ifdef CONFIG_IP_PIMSM | |
963 | if (assert == IGMPMSG_WHOLEPKT) { | |
964 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
965 | * Duplicate old header, fix ihl, length etc. |
966 | * And all this only to mangle msg->im_msgtype and | |
967 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 968 | */ |
878c8145 ACM |
969 | skb_push(skb, sizeof(struct iphdr)); |
970 | skb_reset_network_header(skb); | |
badff6d0 | 971 | skb_reset_transport_header(skb); |
0272ffc4 | 972 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 973 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
974 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
975 | msg->im_mbz = 0; | |
0c12295a | 976 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
977 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
978 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
979 | sizeof(struct iphdr)); | |
e905a9ed | 980 | } else |
1da177e4 | 981 | #endif |
e905a9ed YH |
982 | { |
983 | ||
a8cb16dd | 984 | /* Copy the IP header */ |
1da177e4 | 985 | |
30f3a40f | 986 | skb_set_network_header(skb, skb->len); |
ddc7b8e3 | 987 | skb_put(skb, ihl); |
27d7ff46 | 988 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
a8cb16dd | 989 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
eddc9ec5 | 990 | msg = (struct igmpmsg *)skb_network_header(skb); |
1da177e4 | 991 | msg->im_vif = vifi; |
adf30907 | 992 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 | 993 | |
a8cb16dd | 994 | /* Add our header */ |
1da177e4 | 995 | |
a8cb16dd | 996 | igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
997 | igmp->type = |
998 | msg->im_msgtype = assert; | |
a8cb16dd ED |
999 | igmp->code = 0; |
1000 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
b0e380b1 | 1001 | skb->transport_header = skb->network_header; |
e905a9ed | 1002 | } |
1da177e4 | 1003 | |
4c968709 ED |
1004 | rcu_read_lock(); |
1005 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1006 | if (mroute_sk == NULL) { | |
1007 | rcu_read_unlock(); | |
1da177e4 LT |
1008 | kfree_skb(skb); |
1009 | return -EINVAL; | |
1010 | } | |
1011 | ||
a8cb16dd ED |
1012 | /* Deliver to mrouted */ |
1013 | ||
4c968709 ED |
1014 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1015 | rcu_read_unlock(); | |
70a269e6 | 1016 | if (ret < 0) { |
e87cc472 | 1017 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1018 | kfree_skb(skb); |
1019 | } | |
1020 | ||
1021 | return ret; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Queue a packet for resolution. It gets locked cache entry! | |
1026 | */ | |
e905a9ed | 1027 | |
1da177e4 | 1028 | static int |
0c12295a | 1029 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 1030 | { |
862465f2 | 1031 | bool found = false; |
1da177e4 LT |
1032 | int err; |
1033 | struct mfc_cache *c; | |
eddc9ec5 | 1034 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1035 | |
1036 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1037 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1038 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1039 | c->mfc_origin == iph->saddr) { |
1040 | found = true; | |
1da177e4 | 1041 | break; |
862465f2 | 1042 | } |
1da177e4 LT |
1043 | } |
1044 | ||
862465f2 | 1045 | if (!found) { |
a8cb16dd | 1046 | /* Create a new entry if allowable */ |
1da177e4 | 1047 | |
0c12295a | 1048 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1049 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1050 | spin_unlock_bh(&mfc_unres_lock); |
1051 | ||
1052 | kfree_skb(skb); | |
1053 | return -ENOBUFS; | |
1054 | } | |
1055 | ||
a8cb16dd ED |
1056 | /* Fill in the new cache entry */ |
1057 | ||
eddc9ec5 ACM |
1058 | c->mfc_parent = -1; |
1059 | c->mfc_origin = iph->saddr; | |
1060 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1061 | |
a8cb16dd ED |
1062 | /* Reflect first query at mrouted. */ |
1063 | ||
0c12295a | 1064 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1065 | if (err < 0) { |
e905a9ed | 1066 | /* If the report failed throw the cache entry |
1da177e4 LT |
1067 | out - Brad Parker |
1068 | */ | |
1069 | spin_unlock_bh(&mfc_unres_lock); | |
1070 | ||
5c0a66f5 | 1071 | ipmr_cache_free(c); |
1da177e4 LT |
1072 | kfree_skb(skb); |
1073 | return err; | |
1074 | } | |
1075 | ||
0c12295a PM |
1076 | atomic_inc(&mrt->cache_resolve_queue_len); |
1077 | list_add(&c->list, &mrt->mfc_unres_queue); | |
8cd3ac9f | 1078 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1079 | |
278554bd DM |
1080 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1081 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1082 | } |
1083 | ||
a8cb16dd ED |
1084 | /* See if we can append the packet */ |
1085 | ||
1086 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1da177e4 LT |
1087 | kfree_skb(skb); |
1088 | err = -ENOBUFS; | |
1089 | } else { | |
c354e124 | 1090 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1091 | err = 0; |
1092 | } | |
1093 | ||
1094 | spin_unlock_bh(&mfc_unres_lock); | |
1095 | return err; | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * MFC cache manipulation by user space mroute daemon | |
1100 | */ | |
1101 | ||
660b26dc | 1102 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 LT |
1103 | { |
1104 | int line; | |
862465f2 | 1105 | struct mfc_cache *c, *next; |
1da177e4 | 1106 | |
c354e124 | 1107 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1108 | |
0c12295a | 1109 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1110 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1111 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1112 | (parent == -1 || parent == c->mfc_parent)) { | |
a8c9486b | 1113 | list_del_rcu(&c->list); |
8cd3ac9f | 1114 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1115 | ipmr_cache_free(c); |
1da177e4 LT |
1116 | return 0; |
1117 | } | |
1118 | } | |
1119 | return -ENOENT; | |
1120 | } | |
1121 | ||
0c12295a | 1122 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1123 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1124 | { |
862465f2 | 1125 | bool found = false; |
1da177e4 | 1126 | int line; |
862465f2 | 1127 | struct mfc_cache *uc, *c; |
1da177e4 | 1128 | |
a50436f2 PM |
1129 | if (mfc->mfcc_parent >= MAXVIFS) |
1130 | return -ENFILE; | |
1131 | ||
c354e124 | 1132 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1133 | |
0c12295a | 1134 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1135 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1136 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1137 | (parent == -1 || parent == c->mfc_parent)) { | |
862465f2 | 1138 | found = true; |
1da177e4 | 1139 | break; |
862465f2 | 1140 | } |
1da177e4 LT |
1141 | } |
1142 | ||
862465f2 | 1143 | if (found) { |
1da177e4 LT |
1144 | write_lock_bh(&mrt_lock); |
1145 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1146 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1147 | if (!mrtsock) |
1148 | c->mfc_flags |= MFC_STATIC; | |
1149 | write_unlock_bh(&mrt_lock); | |
8cd3ac9f | 1150 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1151 | return 0; |
1152 | } | |
1153 | ||
360eb5da | 1154 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1155 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1156 | return -EINVAL; |
1157 | ||
d658f8a0 | 1158 | c = ipmr_cache_alloc(); |
c354e124 | 1159 | if (c == NULL) |
1da177e4 LT |
1160 | return -ENOMEM; |
1161 | ||
c354e124 JK |
1162 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1163 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1164 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1165 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1166 | if (!mrtsock) |
1167 | c->mfc_flags |= MFC_STATIC; | |
1168 | ||
a8c9486b | 1169 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1170 | |
1171 | /* | |
1172 | * Check to see if we resolved a queued list. If so we | |
1173 | * need to send on the frames and tidy up. | |
1174 | */ | |
b0ebb739 | 1175 | found = false; |
1da177e4 | 1176 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1177 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1178 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1179 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1180 | list_del(&uc->list); |
0c12295a | 1181 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1182 | found = true; |
1da177e4 LT |
1183 | break; |
1184 | } | |
1185 | } | |
0c12295a PM |
1186 | if (list_empty(&mrt->mfc_unres_queue)) |
1187 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1188 | spin_unlock_bh(&mfc_unres_lock); |
1189 | ||
b0ebb739 | 1190 | if (found) { |
0c12295a | 1191 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1192 | ipmr_cache_free(uc); |
1da177e4 | 1193 | } |
8cd3ac9f | 1194 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1195 | return 0; |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Close the multicast socket, and clear the vif tables etc | |
1200 | */ | |
e905a9ed | 1201 | |
0c12295a | 1202 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1203 | { |
1204 | int i; | |
d17fa6fa | 1205 | LIST_HEAD(list); |
862465f2 | 1206 | struct mfc_cache *c, *next; |
e905a9ed | 1207 | |
a8cb16dd ED |
1208 | /* Shut down all active vif entries */ |
1209 | ||
0c12295a | 1210 | for (i = 0; i < mrt->maxvif; i++) { |
a8cb16dd | 1211 | if (!(mrt->vif_table[i].flags & VIFF_STATIC)) |
0c12295a | 1212 | vif_delete(mrt, i, 0, &list); |
1da177e4 | 1213 | } |
d17fa6fa | 1214 | unregister_netdevice_many(&list); |
1da177e4 | 1215 | |
a8cb16dd ED |
1216 | /* Wipe the cache */ |
1217 | ||
862465f2 | 1218 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1219 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
a8c9486b | 1220 | if (c->mfc_flags & MFC_STATIC) |
1da177e4 | 1221 | continue; |
a8c9486b | 1222 | list_del_rcu(&c->list); |
8cd3ac9f | 1223 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1224 | ipmr_cache_free(c); |
1da177e4 LT |
1225 | } |
1226 | } | |
1227 | ||
0c12295a | 1228 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1229 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1230 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1231 | list_del(&c->list); |
8cd3ac9f | 1232 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 1233 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1234 | } |
1235 | spin_unlock_bh(&mfc_unres_lock); | |
1236 | } | |
1237 | } | |
1238 | ||
4c968709 ED |
1239 | /* called from ip_ra_control(), before an RCU grace period, |
1240 | * we dont need to call synchronize_rcu() here | |
1241 | */ | |
1da177e4 LT |
1242 | static void mrtsock_destruct(struct sock *sk) |
1243 | { | |
4feb88e5 | 1244 | struct net *net = sock_net(sk); |
f0ad0860 | 1245 | struct mr_table *mrt; |
4feb88e5 | 1246 | |
1da177e4 | 1247 | rtnl_lock(); |
f0ad0860 | 1248 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1249 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1250 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
d67b8c61 ND |
1251 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1252 | NETCONFA_IFINDEX_ALL, | |
1253 | net->ipv4.devconf_all); | |
a9b3cd7f | 1254 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
f0ad0860 PM |
1255 | mroute_clean_tables(mrt); |
1256 | } | |
1da177e4 LT |
1257 | } |
1258 | rtnl_unlock(); | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * Socket options and virtual interface manipulation. The whole | |
1263 | * virtual interface system is a complete heap, but unfortunately | |
1264 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1265 | * MOSPF/PIM router set up we can clean this up. | |
1266 | */ | |
e905a9ed | 1267 | |
b7058842 | 1268 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 | 1269 | { |
660b26dc | 1270 | int ret, parent = 0; |
1da177e4 LT |
1271 | struct vifctl vif; |
1272 | struct mfcctl mfc; | |
4feb88e5 | 1273 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1274 | struct mr_table *mrt; |
1275 | ||
5e1859fb ED |
1276 | if (sk->sk_type != SOCK_RAW || |
1277 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1278 | return -EOPNOTSUPP; | |
1279 | ||
f0ad0860 PM |
1280 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
1281 | if (mrt == NULL) | |
1282 | return -ENOENT; | |
e905a9ed | 1283 | |
132adf54 | 1284 | if (optname != MRT_INIT) { |
33d480ce | 1285 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
52e804c6 | 1286 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1287 | return -EACCES; |
1288 | } | |
1289 | ||
132adf54 SH |
1290 | switch (optname) { |
1291 | case MRT_INIT: | |
c354e124 | 1292 | if (optlen != sizeof(int)) |
5e1859fb | 1293 | return -EINVAL; |
1da177e4 | 1294 | |
132adf54 | 1295 | rtnl_lock(); |
4c968709 | 1296 | if (rtnl_dereference(mrt->mroute_sk)) { |
1da177e4 | 1297 | rtnl_unlock(); |
132adf54 SH |
1298 | return -EADDRINUSE; |
1299 | } | |
1300 | ||
1301 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1302 | if (ret == 0) { | |
cf778b00 | 1303 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1304 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
d67b8c61 ND |
1305 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1306 | NETCONFA_IFINDEX_ALL, | |
1307 | net->ipv4.devconf_all); | |
132adf54 SH |
1308 | } |
1309 | rtnl_unlock(); | |
1310 | return ret; | |
1311 | case MRT_DONE: | |
33d480ce | 1312 | if (sk != rcu_access_pointer(mrt->mroute_sk)) |
132adf54 SH |
1313 | return -EACCES; |
1314 | return ip_ra_control(sk, 0, NULL); | |
1315 | case MRT_ADD_VIF: | |
1316 | case MRT_DEL_VIF: | |
c354e124 | 1317 | if (optlen != sizeof(vif)) |
132adf54 | 1318 | return -EINVAL; |
c354e124 | 1319 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1320 | return -EFAULT; |
1321 | if (vif.vifc_vifi >= MAXVIFS) | |
1322 | return -ENFILE; | |
1323 | rtnl_lock(); | |
c354e124 | 1324 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1325 | ret = vif_add(net, mrt, &vif, |
1326 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1327 | } else { |
0c12295a | 1328 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1329 | } |
1330 | rtnl_unlock(); | |
1331 | return ret; | |
1da177e4 LT |
1332 | |
1333 | /* | |
1334 | * Manipulate the forwarding caches. These live | |
1335 | * in a sort of kernel/user symbiosis. | |
1336 | */ | |
132adf54 SH |
1337 | case MRT_ADD_MFC: |
1338 | case MRT_DEL_MFC: | |
660b26dc ND |
1339 | parent = -1; |
1340 | case MRT_ADD_MFC_PROXY: | |
1341 | case MRT_DEL_MFC_PROXY: | |
c354e124 | 1342 | if (optlen != sizeof(mfc)) |
132adf54 | 1343 | return -EINVAL; |
c354e124 | 1344 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 | 1345 | return -EFAULT; |
660b26dc ND |
1346 | if (parent == 0) |
1347 | parent = mfc.mfcc_parent; | |
132adf54 | 1348 | rtnl_lock(); |
660b26dc ND |
1349 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1350 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1351 | else |
4c968709 | 1352 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1353 | sk == rtnl_dereference(mrt->mroute_sk), |
1354 | parent); | |
132adf54 SH |
1355 | rtnl_unlock(); |
1356 | return ret; | |
1da177e4 LT |
1357 | /* |
1358 | * Control PIM assert. | |
1359 | */ | |
132adf54 SH |
1360 | case MRT_ASSERT: |
1361 | { | |
1362 | int v; | |
5e1859fb ED |
1363 | if (optlen != sizeof(v)) |
1364 | return -EINVAL; | |
a8cb16dd | 1365 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1366 | return -EFAULT; |
53d6841d | 1367 | mrt->mroute_do_assert = v; |
132adf54 SH |
1368 | return 0; |
1369 | } | |
1da177e4 | 1370 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1371 | case MRT_PIM: |
1372 | { | |
ba93ef74 SH |
1373 | int v; |
1374 | ||
5e1859fb ED |
1375 | if (optlen != sizeof(v)) |
1376 | return -EINVAL; | |
a8cb16dd | 1377 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1378 | return -EFAULT; |
5e1859fb | 1379 | v = !!v; |
ba93ef74 | 1380 | |
132adf54 SH |
1381 | rtnl_lock(); |
1382 | ret = 0; | |
0c12295a PM |
1383 | if (v != mrt->mroute_do_pim) { |
1384 | mrt->mroute_do_pim = v; | |
1385 | mrt->mroute_do_assert = v; | |
1da177e4 | 1386 | } |
132adf54 SH |
1387 | rtnl_unlock(); |
1388 | return ret; | |
1389 | } | |
f0ad0860 PM |
1390 | #endif |
1391 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1392 | case MRT_TABLE: | |
1393 | { | |
1394 | u32 v; | |
1395 | ||
1396 | if (optlen != sizeof(u32)) | |
1397 | return -EINVAL; | |
1398 | if (get_user(v, (u32 __user *)optval)) | |
1399 | return -EFAULT; | |
f0ad0860 | 1400 | |
b49d3c1e ED |
1401 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
1402 | if (v != RT_TABLE_DEFAULT && v >= 1000000000) | |
1403 | return -EINVAL; | |
1404 | ||
f0ad0860 PM |
1405 | rtnl_lock(); |
1406 | ret = 0; | |
4c968709 ED |
1407 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1408 | ret = -EBUSY; | |
1409 | } else { | |
1410 | if (!ipmr_new_table(net, v)) | |
1411 | ret = -ENOMEM; | |
5e1859fb ED |
1412 | else |
1413 | raw_sk(sk)->ipmr_table = v; | |
4c968709 | 1414 | } |
f0ad0860 PM |
1415 | rtnl_unlock(); |
1416 | return ret; | |
1417 | } | |
1da177e4 | 1418 | #endif |
132adf54 SH |
1419 | /* |
1420 | * Spurious command, or MRT_VERSION which you cannot | |
1421 | * set. | |
1422 | */ | |
1423 | default: | |
1424 | return -ENOPROTOOPT; | |
1da177e4 LT |
1425 | } |
1426 | } | |
1427 | ||
1428 | /* | |
1429 | * Getsock opt support for the multicast routing system. | |
1430 | */ | |
e905a9ed | 1431 | |
c354e124 | 1432 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1433 | { |
1434 | int olr; | |
1435 | int val; | |
4feb88e5 | 1436 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1437 | struct mr_table *mrt; |
1438 | ||
5e1859fb ED |
1439 | if (sk->sk_type != SOCK_RAW || |
1440 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1441 | return -EOPNOTSUPP; | |
1442 | ||
f0ad0860 PM |
1443 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
1444 | if (mrt == NULL) | |
1445 | return -ENOENT; | |
1da177e4 | 1446 | |
c354e124 | 1447 | if (optname != MRT_VERSION && |
1da177e4 | 1448 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 1449 | optname != MRT_PIM && |
1da177e4 | 1450 | #endif |
a8cb16dd | 1451 | optname != MRT_ASSERT) |
1da177e4 LT |
1452 | return -ENOPROTOOPT; |
1453 | ||
1454 | if (get_user(olr, optlen)) | |
1455 | return -EFAULT; | |
1456 | ||
1457 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1458 | if (olr < 0) | |
1459 | return -EINVAL; | |
e905a9ed | 1460 | |
c354e124 | 1461 | if (put_user(olr, optlen)) |
1da177e4 | 1462 | return -EFAULT; |
c354e124 JK |
1463 | if (optname == MRT_VERSION) |
1464 | val = 0x0305; | |
1da177e4 | 1465 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1466 | else if (optname == MRT_PIM) |
0c12295a | 1467 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1468 | #endif |
1469 | else | |
0c12295a | 1470 | val = mrt->mroute_do_assert; |
c354e124 | 1471 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1472 | return -EFAULT; |
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | /* | |
1477 | * The IP multicast ioctl support routines. | |
1478 | */ | |
e905a9ed | 1479 | |
1da177e4 LT |
1480 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1481 | { | |
1482 | struct sioc_sg_req sr; | |
1483 | struct sioc_vif_req vr; | |
1484 | struct vif_device *vif; | |
1485 | struct mfc_cache *c; | |
4feb88e5 | 1486 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1487 | struct mr_table *mrt; |
1488 | ||
1489 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1490 | if (mrt == NULL) | |
1491 | return -ENOENT; | |
e905a9ed | 1492 | |
132adf54 SH |
1493 | switch (cmd) { |
1494 | case SIOCGETVIFCNT: | |
c354e124 | 1495 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1496 | return -EFAULT; |
0c12295a | 1497 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1498 | return -EINVAL; |
1499 | read_lock(&mrt_lock); | |
0c12295a PM |
1500 | vif = &mrt->vif_table[vr.vifi]; |
1501 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1502 | vr.icount = vif->pkt_in; |
1503 | vr.ocount = vif->pkt_out; | |
1504 | vr.ibytes = vif->bytes_in; | |
1505 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1506 | read_unlock(&mrt_lock); |
1da177e4 | 1507 | |
c354e124 | 1508 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1509 | return -EFAULT; |
1510 | return 0; | |
1511 | } | |
1512 | read_unlock(&mrt_lock); | |
1513 | return -EADDRNOTAVAIL; | |
1514 | case SIOCGETSGCNT: | |
c354e124 | 1515 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1516 | return -EFAULT; |
1517 | ||
a8c9486b | 1518 | rcu_read_lock(); |
0c12295a | 1519 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1520 | if (c) { |
1521 | sr.pktcnt = c->mfc_un.res.pkt; | |
1522 | sr.bytecnt = c->mfc_un.res.bytes; | |
1523 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1524 | rcu_read_unlock(); |
132adf54 | 1525 | |
c354e124 | 1526 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1527 | return -EFAULT; |
1528 | return 0; | |
1529 | } | |
a8c9486b | 1530 | rcu_read_unlock(); |
132adf54 SH |
1531 | return -EADDRNOTAVAIL; |
1532 | default: | |
1533 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1534 | } |
1535 | } | |
1536 | ||
709b46e8 EB |
1537 | #ifdef CONFIG_COMPAT |
1538 | struct compat_sioc_sg_req { | |
1539 | struct in_addr src; | |
1540 | struct in_addr grp; | |
1541 | compat_ulong_t pktcnt; | |
1542 | compat_ulong_t bytecnt; | |
1543 | compat_ulong_t wrong_if; | |
1544 | }; | |
1545 | ||
ca6b8bb0 DM |
1546 | struct compat_sioc_vif_req { |
1547 | vifi_t vifi; /* Which iface */ | |
1548 | compat_ulong_t icount; | |
1549 | compat_ulong_t ocount; | |
1550 | compat_ulong_t ibytes; | |
1551 | compat_ulong_t obytes; | |
1552 | }; | |
1553 | ||
709b46e8 EB |
1554 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1555 | { | |
0033d5ad | 1556 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1557 | struct compat_sioc_vif_req vr; |
1558 | struct vif_device *vif; | |
709b46e8 EB |
1559 | struct mfc_cache *c; |
1560 | struct net *net = sock_net(sk); | |
1561 | struct mr_table *mrt; | |
1562 | ||
1563 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1564 | if (mrt == NULL) | |
1565 | return -ENOENT; | |
1566 | ||
1567 | switch (cmd) { | |
ca6b8bb0 DM |
1568 | case SIOCGETVIFCNT: |
1569 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1570 | return -EFAULT; | |
1571 | if (vr.vifi >= mrt->maxvif) | |
1572 | return -EINVAL; | |
1573 | read_lock(&mrt_lock); | |
1574 | vif = &mrt->vif_table[vr.vifi]; | |
1575 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1576 | vr.icount = vif->pkt_in; | |
1577 | vr.ocount = vif->pkt_out; | |
1578 | vr.ibytes = vif->bytes_in; | |
1579 | vr.obytes = vif->bytes_out; | |
1580 | read_unlock(&mrt_lock); | |
1581 | ||
1582 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1583 | return -EFAULT; | |
1584 | return 0; | |
1585 | } | |
1586 | read_unlock(&mrt_lock); | |
1587 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1588 | case SIOCGETSGCNT: |
1589 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1590 | return -EFAULT; | |
1591 | ||
1592 | rcu_read_lock(); | |
1593 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1594 | if (c) { | |
1595 | sr.pktcnt = c->mfc_un.res.pkt; | |
1596 | sr.bytecnt = c->mfc_un.res.bytes; | |
1597 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1598 | rcu_read_unlock(); | |
1599 | ||
1600 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1601 | return -EFAULT; | |
1602 | return 0; | |
1603 | } | |
1604 | rcu_read_unlock(); | |
1605 | return -EADDRNOTAVAIL; | |
1606 | default: | |
1607 | return -ENOIOCTLCMD; | |
1608 | } | |
1609 | } | |
1610 | #endif | |
1611 | ||
1da177e4 LT |
1612 | |
1613 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1614 | { | |
351638e7 | 1615 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1616 | struct net *net = dev_net(dev); |
f0ad0860 | 1617 | struct mr_table *mrt; |
1da177e4 LT |
1618 | struct vif_device *v; |
1619 | int ct; | |
e9dc8653 | 1620 | |
1da177e4 LT |
1621 | if (event != NETDEV_UNREGISTER) |
1622 | return NOTIFY_DONE; | |
f0ad0860 PM |
1623 | |
1624 | ipmr_for_each_table(mrt, net) { | |
1625 | v = &mrt->vif_table[0]; | |
1626 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1627 | if (v->dev == dev) | |
e92036a6 | 1628 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1629 | } |
1da177e4 LT |
1630 | } |
1631 | return NOTIFY_DONE; | |
1632 | } | |
1633 | ||
1634 | ||
c354e124 | 1635 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1636 | .notifier_call = ipmr_device_event, |
1637 | }; | |
1638 | ||
1639 | /* | |
a8cb16dd | 1640 | * Encapsulate a packet by attaching a valid IPIP header to it. |
1da177e4 LT |
1641 | * This avoids tunnel drivers and other mess and gives us the speed so |
1642 | * important for multicast video. | |
1643 | */ | |
e905a9ed | 1644 | |
114c7844 | 1645 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1646 | { |
8856dfa3 | 1647 | struct iphdr *iph; |
b71d1d42 | 1648 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1649 | |
1650 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1651 | skb->transport_header = skb->network_header; |
8856dfa3 | 1652 | skb_reset_network_header(skb); |
eddc9ec5 | 1653 | iph = ip_hdr(skb); |
1da177e4 | 1654 | |
a8cb16dd | 1655 | iph->version = 4; |
e023dd64 ACM |
1656 | iph->tos = old_iph->tos; |
1657 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1658 | iph->frag_off = 0; |
1659 | iph->daddr = daddr; | |
1660 | iph->saddr = saddr; | |
1661 | iph->protocol = IPPROTO_IPIP; | |
1662 | iph->ihl = 5; | |
1663 | iph->tot_len = htons(skb->len); | |
73f156a6 | 1664 | ip_select_ident(skb, NULL); |
1da177e4 LT |
1665 | ip_send_check(iph); |
1666 | ||
1da177e4 LT |
1667 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1668 | nf_reset(skb); | |
1669 | } | |
1670 | ||
1671 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1672 | { | |
a8cb16dd | 1673 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1674 | |
adf30907 | 1675 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
2d8dbb04 | 1676 | IP_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTOCTETS, skb->len); |
1da177e4 LT |
1677 | |
1678 | if (unlikely(opt->optlen)) | |
1679 | ip_forward_options(skb); | |
1680 | ||
1681 | return dst_output(skb); | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * Processing handlers for ipmr_forward | |
1686 | */ | |
1687 | ||
0c12295a PM |
1688 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1689 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1690 | { |
eddc9ec5 | 1691 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1692 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1693 | struct net_device *dev; |
1694 | struct rtable *rt; | |
31e4543d | 1695 | struct flowi4 fl4; |
1da177e4 LT |
1696 | int encap = 0; |
1697 | ||
1698 | if (vif->dev == NULL) | |
1699 | goto out_free; | |
1700 | ||
1701 | #ifdef CONFIG_IP_PIMSM | |
1702 | if (vif->flags & VIFF_REGISTER) { | |
1703 | vif->pkt_out++; | |
c354e124 | 1704 | vif->bytes_out += skb->len; |
cf3677ae PE |
1705 | vif->dev->stats.tx_bytes += skb->len; |
1706 | vif->dev->stats.tx_packets++; | |
0c12295a | 1707 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1708 | goto out_free; |
1da177e4 LT |
1709 | } |
1710 | #endif | |
1711 | ||
a8cb16dd | 1712 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1713 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1714 | vif->remote, vif->local, |
1715 | 0, 0, | |
1716 | IPPROTO_IPIP, | |
1717 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1718 | if (IS_ERR(rt)) |
1da177e4 LT |
1719 | goto out_free; |
1720 | encap = sizeof(struct iphdr); | |
1721 | } else { | |
31e4543d | 1722 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1723 | 0, 0, |
1724 | IPPROTO_IPIP, | |
1725 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1726 | if (IS_ERR(rt)) |
1da177e4 LT |
1727 | goto out_free; |
1728 | } | |
1729 | ||
d8d1f30b | 1730 | dev = rt->dst.dev; |
1da177e4 | 1731 | |
d8d1f30b | 1732 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1733 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1734 | * allow to send ICMP, so that packets will disappear |
1735 | * to blackhole. | |
1da177e4 LT |
1736 | */ |
1737 | ||
7c73a6fa | 1738 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1739 | ip_rt_put(rt); |
1740 | goto out_free; | |
1741 | } | |
1742 | ||
d8d1f30b | 1743 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1744 | |
1745 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1746 | ip_rt_put(rt); |
1da177e4 LT |
1747 | goto out_free; |
1748 | } | |
1749 | ||
1750 | vif->pkt_out++; | |
c354e124 | 1751 | vif->bytes_out += skb->len; |
1da177e4 | 1752 | |
adf30907 | 1753 | skb_dst_drop(skb); |
d8d1f30b | 1754 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1755 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1756 | |
1757 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1758 | * What do we do with netfilter? -- RR |
1759 | */ | |
1da177e4 LT |
1760 | if (vif->flags & VIFF_TUNNEL) { |
1761 | ip_encap(skb, vif->local, vif->remote); | |
1762 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1763 | vif->dev->stats.tx_packets++; |
1764 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1765 | } |
1766 | ||
1767 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1768 | ||
1769 | /* | |
1770 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1771 | * not only before forwarding, but after forwarding on all output | |
1772 | * interfaces. It is clear, if mrouter runs a multicasting | |
1773 | * program, it should receive packets not depending to what interface | |
1774 | * program is joined. | |
1775 | * If we will not make it, the program will have to join on all | |
1776 | * interfaces. On the other hand, multihoming host (or router, but | |
1777 | * not mrouter) cannot join to more than one interface - it will | |
1778 | * result in receiving multiple packets. | |
1779 | */ | |
9bbc768a | 1780 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1781 | ipmr_forward_finish); |
1782 | return; | |
1783 | ||
1784 | out_free: | |
1785 | kfree_skb(skb); | |
1da177e4 LT |
1786 | } |
1787 | ||
0c12295a | 1788 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1789 | { |
1790 | int ct; | |
0c12295a PM |
1791 | |
1792 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1793 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1794 | break; |
1795 | } | |
1796 | return ct; | |
1797 | } | |
1798 | ||
1799 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1800 | ||
c4854ec8 RR |
1801 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
1802 | struct sk_buff *skb, struct mfc_cache *cache, | |
1803 | int local) | |
1da177e4 LT |
1804 | { |
1805 | int psend = -1; | |
1806 | int vif, ct; | |
660b26dc | 1807 | int true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 LT |
1808 | |
1809 | vif = cache->mfc_parent; | |
1810 | cache->mfc_un.res.pkt++; | |
1811 | cache->mfc_un.res.bytes += skb->len; | |
1812 | ||
360eb5da | 1813 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1814 | struct mfc_cache *cache_proxy; |
1815 | ||
1816 | /* For an (*,G) entry, we only check that the incomming | |
1817 | * interface is part of the static tree. | |
1818 | */ | |
1819 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); | |
1820 | if (cache_proxy && | |
1821 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) | |
1822 | goto forward; | |
1823 | } | |
1824 | ||
1da177e4 LT |
1825 | /* |
1826 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1827 | */ | |
0c12295a | 1828 | if (mrt->vif_table[vif].dev != skb->dev) { |
c7537967 | 1829 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1830 | /* It is our own packet, looped back. |
a8cb16dd ED |
1831 | * Very complicated situation... |
1832 | * | |
1833 | * The best workaround until routing daemons will be | |
1834 | * fixed is not to redistribute packet, if it was | |
1835 | * send through wrong interface. It means, that | |
1836 | * multicast applications WILL NOT work for | |
1837 | * (S,G), which have default multicast route pointing | |
1838 | * to wrong oif. In any case, it is not a good | |
1839 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1840 | */ |
1841 | goto dont_forward; | |
1842 | } | |
1843 | ||
1844 | cache->mfc_un.res.wrong_if++; | |
1da177e4 | 1845 | |
0c12295a | 1846 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1847 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1848 | * so that we cannot check that packet arrived on an oif. |
1849 | * It is bad, but otherwise we would need to move pretty | |
1850 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1851 | */ |
0c12295a | 1852 | (mrt->mroute_do_pim || |
6f9374a9 | 1853 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1854 | time_after(jiffies, |
1da177e4 LT |
1855 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1856 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1857 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1858 | } |
1859 | goto dont_forward; | |
1860 | } | |
1861 | ||
660b26dc | 1862 | forward: |
0c12295a PM |
1863 | mrt->vif_table[vif].pkt_in++; |
1864 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1865 | |
1866 | /* | |
1867 | * Forward the frame | |
1868 | */ | |
360eb5da ND |
1869 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
1870 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc ND |
1871 | if (true_vifi >= 0 && |
1872 | true_vifi != cache->mfc_parent && | |
1873 | ip_hdr(skb)->ttl > | |
1874 | cache->mfc_un.res.ttls[cache->mfc_parent]) { | |
1875 | /* It's an (*,*) entry and the packet is not coming from | |
1876 | * the upstream: forward the packet to the upstream | |
1877 | * only. | |
1878 | */ | |
1879 | psend = cache->mfc_parent; | |
1880 | goto last_forward; | |
1881 | } | |
1882 | goto dont_forward; | |
1883 | } | |
a8cb16dd ED |
1884 | for (ct = cache->mfc_un.res.maxvif - 1; |
1885 | ct >= cache->mfc_un.res.minvif; ct--) { | |
660b26dc | 1886 | /* For (*,G) entry, don't forward to the incoming interface */ |
360eb5da ND |
1887 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
1888 | ct != true_vifi) && | |
660b26dc | 1889 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1890 | if (psend != -1) { |
1891 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1892 | |
1da177e4 | 1893 | if (skb2) |
0c12295a PM |
1894 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1895 | psend); | |
1da177e4 | 1896 | } |
c354e124 | 1897 | psend = ct; |
1da177e4 LT |
1898 | } |
1899 | } | |
660b26dc | 1900 | last_forward: |
1da177e4 LT |
1901 | if (psend != -1) { |
1902 | if (local) { | |
1903 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1904 | |
1da177e4 | 1905 | if (skb2) |
0c12295a | 1906 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1907 | } else { |
0c12295a | 1908 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
c4854ec8 | 1909 | return; |
1da177e4 LT |
1910 | } |
1911 | } | |
1912 | ||
1913 | dont_forward: | |
1914 | if (!local) | |
1915 | kfree_skb(skb); | |
1da177e4 LT |
1916 | } |
1917 | ||
417da66f | 1918 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 1919 | { |
417da66f DM |
1920 | struct rtable *rt = skb_rtable(skb); |
1921 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 1922 | struct flowi4 fl4 = { |
417da66f DM |
1923 | .daddr = iph->daddr, |
1924 | .saddr = iph->saddr, | |
b0fe4a31 | 1925 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
1926 | .flowi4_oif = (rt_is_output_route(rt) ? |
1927 | skb->dev->ifindex : 0), | |
1928 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 1929 | LOOPBACK_IFINDEX : |
4fd551d7 | 1930 | skb->dev->ifindex), |
b4869889 | 1931 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
1932 | }; |
1933 | struct mr_table *mrt; | |
1934 | int err; | |
1935 | ||
da91981b | 1936 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
1937 | if (err) |
1938 | return ERR_PTR(err); | |
1939 | return mrt; | |
1940 | } | |
1da177e4 LT |
1941 | |
1942 | /* | |
1943 | * Multicast packets for forwarding arrive here | |
4c968709 | 1944 | * Called with rcu_read_lock(); |
1da177e4 LT |
1945 | */ |
1946 | ||
1947 | int ip_mr_input(struct sk_buff *skb) | |
1948 | { | |
1949 | struct mfc_cache *cache; | |
4feb88e5 | 1950 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1951 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 1952 | struct mr_table *mrt; |
1da177e4 LT |
1953 | |
1954 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 1955 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 1956 | */ |
4c968709 | 1957 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
1958 | goto dont_forward; |
1959 | ||
417da66f | 1960 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
1961 | if (IS_ERR(mrt)) { |
1962 | kfree_skb(skb); | |
1963 | return PTR_ERR(mrt); | |
e40dbc51 | 1964 | } |
1da177e4 | 1965 | if (!local) { |
4c968709 ED |
1966 | if (IPCB(skb)->opt.router_alert) { |
1967 | if (ip_call_ra_chain(skb)) | |
1968 | return 0; | |
1969 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1970 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1971 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1972 | * option to IGMP packets destined to routable | |
1973 | * groups. It is very bad, because it means | |
1974 | * that we can forward NO IGMP messages. | |
1975 | */ | |
1976 | struct sock *mroute_sk; | |
1977 | ||
1978 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1979 | if (mroute_sk) { | |
1980 | nf_reset(skb); | |
1981 | raw_rcv(mroute_sk, skb); | |
1982 | return 0; | |
1983 | } | |
1da177e4 LT |
1984 | } |
1985 | } | |
1986 | ||
a8c9486b | 1987 | /* already under rcu_read_lock() */ |
0c12295a | 1988 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
660b26dc ND |
1989 | if (cache == NULL) { |
1990 | int vif = ipmr_find_vif(mrt, skb->dev); | |
1991 | ||
1992 | if (vif >= 0) | |
1993 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
1994 | vif); | |
1995 | } | |
1da177e4 LT |
1996 | |
1997 | /* | |
1998 | * No usable cache entry | |
1999 | */ | |
c354e124 | 2000 | if (cache == NULL) { |
1da177e4 LT |
2001 | int vif; |
2002 | ||
2003 | if (local) { | |
2004 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2005 | ip_local_deliver(skb); | |
a8c9486b | 2006 | if (skb2 == NULL) |
1da177e4 | 2007 | return -ENOBUFS; |
1da177e4 LT |
2008 | skb = skb2; |
2009 | } | |
2010 | ||
a8c9486b | 2011 | read_lock(&mrt_lock); |
0c12295a | 2012 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2013 | if (vif >= 0) { |
0eae88f3 | 2014 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
2015 | read_unlock(&mrt_lock); |
2016 | ||
0eae88f3 | 2017 | return err2; |
1da177e4 LT |
2018 | } |
2019 | read_unlock(&mrt_lock); | |
2020 | kfree_skb(skb); | |
2021 | return -ENODEV; | |
2022 | } | |
2023 | ||
a8c9486b | 2024 | read_lock(&mrt_lock); |
0c12295a | 2025 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
2026 | read_unlock(&mrt_lock); |
2027 | ||
2028 | if (local) | |
2029 | return ip_local_deliver(skb); | |
2030 | ||
2031 | return 0; | |
2032 | ||
2033 | dont_forward: | |
2034 | if (local) | |
2035 | return ip_local_deliver(skb); | |
2036 | kfree_skb(skb); | |
2037 | return 0; | |
2038 | } | |
2039 | ||
b1879204 | 2040 | #ifdef CONFIG_IP_PIMSM |
55747a0a | 2041 | /* called with rcu_read_lock() */ |
f0ad0860 PM |
2042 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
2043 | unsigned int pimlen) | |
1da177e4 | 2044 | { |
b1879204 IJ |
2045 | struct net_device *reg_dev = NULL; |
2046 | struct iphdr *encap; | |
1da177e4 | 2047 | |
b1879204 | 2048 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 | 2049 | /* |
a8cb16dd ED |
2050 | * Check that: |
2051 | * a. packet is really sent to a multicast group | |
2052 | * b. packet is not a NULL-REGISTER | |
2053 | * c. packet is not truncated | |
1da177e4 | 2054 | */ |
f97c1e0c | 2055 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 2056 | encap->tot_len == 0 || |
b1879204 IJ |
2057 | ntohs(encap->tot_len) + pimlen > skb->len) |
2058 | return 1; | |
1da177e4 LT |
2059 | |
2060 | read_lock(&mrt_lock); | |
0c12295a PM |
2061 | if (mrt->mroute_reg_vif_num >= 0) |
2062 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
2063 | read_unlock(&mrt_lock); |
2064 | ||
e905a9ed | 2065 | if (reg_dev == NULL) |
b1879204 | 2066 | return 1; |
1da177e4 | 2067 | |
b0e380b1 | 2068 | skb->mac_header = skb->network_header; |
55747a0a | 2069 | skb_pull(skb, (u8 *)encap - skb->data); |
31c7711b | 2070 | skb_reset_network_header(skb); |
1da177e4 | 2071 | skb->protocol = htons(ETH_P_IP); |
55747a0a | 2072 | skb->ip_summed = CHECKSUM_NONE; |
d19d56dd | 2073 | |
ea23192e | 2074 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
d19d56dd | 2075 | |
1da177e4 | 2076 | netif_rx(skb); |
b1879204 | 2077 | |
55747a0a | 2078 | return NET_RX_SUCCESS; |
b1879204 IJ |
2079 | } |
2080 | #endif | |
2081 | ||
2082 | #ifdef CONFIG_IP_PIMSM_V1 | |
2083 | /* | |
2084 | * Handle IGMP messages of PIMv1 | |
2085 | */ | |
2086 | ||
a8cb16dd | 2087 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2088 | { |
2089 | struct igmphdr *pim; | |
4feb88e5 | 2090 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2091 | struct mr_table *mrt; |
b1879204 IJ |
2092 | |
2093 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2094 | goto drop; | |
2095 | ||
2096 | pim = igmp_hdr(skb); | |
2097 | ||
417da66f | 2098 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2099 | if (IS_ERR(mrt)) |
2100 | goto drop; | |
0c12295a | 2101 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2102 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2103 | goto drop; | |
2104 | ||
f0ad0860 | 2105 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2106 | drop: |
2107 | kfree_skb(skb); | |
2108 | } | |
1da177e4 LT |
2109 | return 0; |
2110 | } | |
2111 | #endif | |
2112 | ||
2113 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2114 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2115 | { |
2116 | struct pimreghdr *pim; | |
f0ad0860 PM |
2117 | struct net *net = dev_net(skb->dev); |
2118 | struct mr_table *mrt; | |
1da177e4 | 2119 | |
b1879204 | 2120 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2121 | goto drop; |
2122 | ||
9c70220b | 2123 | pim = (struct pimreghdr *)skb_transport_header(skb); |
a8cb16dd ED |
2124 | if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || |
2125 | (pim->flags & PIM_NULL_REGISTER) || | |
e905a9ed | 2126 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2127 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2128 | goto drop; |
2129 | ||
417da66f | 2130 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2131 | if (IS_ERR(mrt)) |
2132 | goto drop; | |
f0ad0860 | 2133 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2134 | drop: |
2135 | kfree_skb(skb); | |
2136 | } | |
1da177e4 LT |
2137 | return 0; |
2138 | } | |
2139 | #endif | |
2140 | ||
cb6a4e46 PM |
2141 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2142 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 LT |
2143 | { |
2144 | int ct; | |
2145 | struct rtnexthop *nhp; | |
92a395e5 | 2146 | struct nlattr *mp_attr; |
adfa85e4 | 2147 | struct rta_mfc_stats mfcs; |
1da177e4 | 2148 | |
7438189b | 2149 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2150 | if (c->mfc_parent >= MAXVIFS) |
7438189b ND |
2151 | return -ENOENT; |
2152 | ||
92a395e5 TG |
2153 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
2154 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) | |
2155 | return -EMSGSIZE; | |
1da177e4 | 2156 | |
92a395e5 TG |
2157 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
2158 | return -EMSGSIZE; | |
1da177e4 LT |
2159 | |
2160 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 2161 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
92a395e5 TG |
2162 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
2163 | nla_nest_cancel(skb, mp_attr); | |
2164 | return -EMSGSIZE; | |
2165 | } | |
2166 | ||
1da177e4 LT |
2167 | nhp->rtnh_flags = 0; |
2168 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 2169 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
2170 | nhp->rtnh_len = sizeof(*nhp); |
2171 | } | |
2172 | } | |
92a395e5 TG |
2173 | |
2174 | nla_nest_end(skb, mp_attr); | |
2175 | ||
adfa85e4 ND |
2176 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2177 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2178 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
2179 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) | |
2180 | return -EMSGSIZE; | |
2181 | ||
1da177e4 LT |
2182 | rtm->rtm_type = RTN_MULTICAST; |
2183 | return 1; | |
1da177e4 LT |
2184 | } |
2185 | ||
9a1b9496 DM |
2186 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2187 | __be32 saddr, __be32 daddr, | |
2188 | struct rtmsg *rtm, int nowait) | |
1da177e4 | 2189 | { |
1da177e4 | 2190 | struct mfc_cache *cache; |
9a1b9496 DM |
2191 | struct mr_table *mrt; |
2192 | int err; | |
1da177e4 | 2193 | |
f0ad0860 PM |
2194 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
2195 | if (mrt == NULL) | |
2196 | return -ENOENT; | |
2197 | ||
a8c9486b | 2198 | rcu_read_lock(); |
9a1b9496 | 2199 | cache = ipmr_cache_find(mrt, saddr, daddr); |
660b26dc ND |
2200 | if (cache == NULL && skb->dev) { |
2201 | int vif = ipmr_find_vif(mrt, skb->dev); | |
1da177e4 | 2202 | |
660b26dc ND |
2203 | if (vif >= 0) |
2204 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2205 | } | |
c354e124 | 2206 | if (cache == NULL) { |
72287490 | 2207 | struct sk_buff *skb2; |
eddc9ec5 | 2208 | struct iphdr *iph; |
1da177e4 | 2209 | struct net_device *dev; |
a8cb16dd | 2210 | int vif = -1; |
1da177e4 LT |
2211 | |
2212 | if (nowait) { | |
a8c9486b | 2213 | rcu_read_unlock(); |
1da177e4 LT |
2214 | return -EAGAIN; |
2215 | } | |
2216 | ||
2217 | dev = skb->dev; | |
a8c9486b | 2218 | read_lock(&mrt_lock); |
a8cb16dd ED |
2219 | if (dev) |
2220 | vif = ipmr_find_vif(mrt, dev); | |
2221 | if (vif < 0) { | |
1da177e4 | 2222 | read_unlock(&mrt_lock); |
a8c9486b | 2223 | rcu_read_unlock(); |
1da177e4 LT |
2224 | return -ENODEV; |
2225 | } | |
72287490 AK |
2226 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2227 | if (!skb2) { | |
2228 | read_unlock(&mrt_lock); | |
a8c9486b | 2229 | rcu_read_unlock(); |
72287490 AK |
2230 | return -ENOMEM; |
2231 | } | |
2232 | ||
e2d1bca7 ACM |
2233 | skb_push(skb2, sizeof(struct iphdr)); |
2234 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2235 | iph = ip_hdr(skb2); |
2236 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2237 | iph->saddr = saddr; |
2238 | iph->daddr = daddr; | |
eddc9ec5 | 2239 | iph->version = 0; |
0c12295a | 2240 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 | 2241 | read_unlock(&mrt_lock); |
a8c9486b | 2242 | rcu_read_unlock(); |
1da177e4 LT |
2243 | return err; |
2244 | } | |
2245 | ||
a8c9486b ED |
2246 | read_lock(&mrt_lock); |
2247 | if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) | |
1da177e4 | 2248 | cache->mfc_flags |= MFC_NOTIFY; |
cb6a4e46 | 2249 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2250 | read_unlock(&mrt_lock); |
a8c9486b | 2251 | rcu_read_unlock(); |
1da177e4 LT |
2252 | return err; |
2253 | } | |
2254 | ||
cb6a4e46 | 2255 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
65886f43 ND |
2256 | u32 portid, u32 seq, struct mfc_cache *c, int cmd, |
2257 | int flags) | |
cb6a4e46 PM |
2258 | { |
2259 | struct nlmsghdr *nlh; | |
2260 | struct rtmsg *rtm; | |
1eb99af5 | 2261 | int err; |
cb6a4e46 | 2262 | |
65886f43 | 2263 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); |
cb6a4e46 PM |
2264 | if (nlh == NULL) |
2265 | return -EMSGSIZE; | |
2266 | ||
2267 | rtm = nlmsg_data(nlh); | |
2268 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2269 | rtm->rtm_dst_len = 32; | |
2270 | rtm->rtm_src_len = 32; | |
2271 | rtm->rtm_tos = 0; | |
2272 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2273 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2274 | goto nla_put_failure; | |
cb6a4e46 PM |
2275 | rtm->rtm_type = RTN_MULTICAST; |
2276 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
9a68ac72 ND |
2277 | if (c->mfc_flags & MFC_STATIC) |
2278 | rtm->rtm_protocol = RTPROT_STATIC; | |
2279 | else | |
2280 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2281 | rtm->rtm_flags = 0; |
2282 | ||
f3756b79 DM |
2283 | if (nla_put_be32(skb, RTA_SRC, c->mfc_origin) || |
2284 | nla_put_be32(skb, RTA_DST, c->mfc_mcastgrp)) | |
2285 | goto nla_put_failure; | |
1eb99af5 ND |
2286 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
2287 | /* do not break the dump if cache is unresolved */ | |
2288 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2289 | goto nla_put_failure; |
2290 | ||
053c095a JB |
2291 | nlmsg_end(skb, nlh); |
2292 | return 0; | |
cb6a4e46 PM |
2293 | |
2294 | nla_put_failure: | |
2295 | nlmsg_cancel(skb, nlh); | |
2296 | return -EMSGSIZE; | |
2297 | } | |
2298 | ||
8cd3ac9f ND |
2299 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2300 | { | |
2301 | size_t len = | |
2302 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2303 | + nla_total_size(4) /* RTA_TABLE */ | |
2304 | + nla_total_size(4) /* RTA_SRC */ | |
2305 | + nla_total_size(4) /* RTA_DST */ | |
2306 | ; | |
2307 | ||
2308 | if (!unresolved) | |
2309 | len = len | |
2310 | + nla_total_size(4) /* RTA_IIF */ | |
2311 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2312 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2313 | /* RTA_MFC_STATS */ | |
2314 | + nla_total_size(sizeof(struct rta_mfc_stats)) | |
2315 | ; | |
2316 | ||
2317 | return len; | |
2318 | } | |
2319 | ||
2320 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2321 | int cmd) | |
2322 | { | |
2323 | struct net *net = read_pnet(&mrt->net); | |
2324 | struct sk_buff *skb; | |
2325 | int err = -ENOBUFS; | |
2326 | ||
2327 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), | |
2328 | GFP_ATOMIC); | |
2329 | if (skb == NULL) | |
2330 | goto errout; | |
2331 | ||
65886f43 | 2332 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); |
8cd3ac9f ND |
2333 | if (err < 0) |
2334 | goto errout; | |
2335 | ||
2336 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2337 | return; | |
2338 | ||
2339 | errout: | |
2340 | kfree_skb(skb); | |
2341 | if (err < 0) | |
2342 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2343 | } | |
2344 | ||
cb6a4e46 PM |
2345 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2346 | { | |
2347 | struct net *net = sock_net(skb->sk); | |
2348 | struct mr_table *mrt; | |
2349 | struct mfc_cache *mfc; | |
2350 | unsigned int t = 0, s_t; | |
2351 | unsigned int h = 0, s_h; | |
2352 | unsigned int e = 0, s_e; | |
2353 | ||
2354 | s_t = cb->args[0]; | |
2355 | s_h = cb->args[1]; | |
2356 | s_e = cb->args[2]; | |
2357 | ||
a8c9486b | 2358 | rcu_read_lock(); |
cb6a4e46 PM |
2359 | ipmr_for_each_table(mrt, net) { |
2360 | if (t < s_t) | |
2361 | goto next_table; | |
2362 | if (t > s_t) | |
2363 | s_h = 0; | |
2364 | for (h = s_h; h < MFC_LINES; h++) { | |
a8c9486b | 2365 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { |
cb6a4e46 PM |
2366 | if (e < s_e) |
2367 | goto next_entry; | |
2368 | if (ipmr_fill_mroute(mrt, skb, | |
15e47304 | 2369 | NETLINK_CB(cb->skb).portid, |
cb6a4e46 | 2370 | cb->nlh->nlmsg_seq, |
65886f43 ND |
2371 | mfc, RTM_NEWROUTE, |
2372 | NLM_F_MULTI) < 0) | |
cb6a4e46 PM |
2373 | goto done; |
2374 | next_entry: | |
2375 | e++; | |
2376 | } | |
2377 | e = s_e = 0; | |
2378 | } | |
1eb99af5 ND |
2379 | spin_lock_bh(&mfc_unres_lock); |
2380 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { | |
2381 | if (e < s_e) | |
2382 | goto next_entry2; | |
2383 | if (ipmr_fill_mroute(mrt, skb, | |
2384 | NETLINK_CB(cb->skb).portid, | |
2385 | cb->nlh->nlmsg_seq, | |
65886f43 ND |
2386 | mfc, RTM_NEWROUTE, |
2387 | NLM_F_MULTI) < 0) { | |
1eb99af5 ND |
2388 | spin_unlock_bh(&mfc_unres_lock); |
2389 | goto done; | |
2390 | } | |
2391 | next_entry2: | |
2392 | e++; | |
2393 | } | |
2394 | spin_unlock_bh(&mfc_unres_lock); | |
2395 | e = s_e = 0; | |
cb6a4e46 PM |
2396 | s_h = 0; |
2397 | next_table: | |
2398 | t++; | |
2399 | } | |
2400 | done: | |
a8c9486b | 2401 | rcu_read_unlock(); |
cb6a4e46 PM |
2402 | |
2403 | cb->args[2] = e; | |
2404 | cb->args[1] = h; | |
2405 | cb->args[0] = t; | |
2406 | ||
2407 | return skb->len; | |
2408 | } | |
2409 | ||
e905a9ed | 2410 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2411 | /* |
a8cb16dd ED |
2412 | * The /proc interfaces to multicast routing : |
2413 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 LT |
2414 | */ |
2415 | struct ipmr_vif_iter { | |
f6bb4514 | 2416 | struct seq_net_private p; |
f0ad0860 | 2417 | struct mr_table *mrt; |
1da177e4 LT |
2418 | int ct; |
2419 | }; | |
2420 | ||
f6bb4514 BT |
2421 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2422 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2423 | loff_t pos) |
2424 | { | |
f0ad0860 | 2425 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2426 | |
2427 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2428 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2429 | continue; |
e905a9ed | 2430 | if (pos-- == 0) |
0c12295a | 2431 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2432 | } |
2433 | return NULL; | |
2434 | } | |
2435 | ||
2436 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2437 | __acquires(mrt_lock) |
1da177e4 | 2438 | { |
f0ad0860 | 2439 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2440 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2441 | struct mr_table *mrt; |
2442 | ||
2443 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2444 | if (mrt == NULL) | |
2445 | return ERR_PTR(-ENOENT); | |
2446 | ||
2447 | iter->mrt = mrt; | |
f6bb4514 | 2448 | |
1da177e4 | 2449 | read_lock(&mrt_lock); |
f6bb4514 | 2450 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2451 | : SEQ_START_TOKEN; |
2452 | } | |
2453 | ||
2454 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2455 | { | |
2456 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2457 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2458 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2459 | |
2460 | ++*pos; | |
2461 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2462 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2463 | |
0c12295a PM |
2464 | while (++iter->ct < mrt->maxvif) { |
2465 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2466 | continue; |
0c12295a | 2467 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2468 | } |
2469 | return NULL; | |
2470 | } | |
2471 | ||
2472 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2473 | __releases(mrt_lock) |
1da177e4 LT |
2474 | { |
2475 | read_unlock(&mrt_lock); | |
2476 | } | |
2477 | ||
2478 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2479 | { | |
f0ad0860 PM |
2480 | struct ipmr_vif_iter *iter = seq->private; |
2481 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2482 | |
1da177e4 | 2483 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2484 | seq_puts(seq, |
1da177e4 LT |
2485 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2486 | } else { | |
2487 | const struct vif_device *vif = v; | |
2488 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2489 | ||
2490 | seq_printf(seq, | |
2491 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2492 | vif - mrt->vif_table, |
e905a9ed | 2493 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2494 | vif->bytes_out, vif->pkt_out, |
2495 | vif->flags, vif->local, vif->remote); | |
2496 | } | |
2497 | return 0; | |
2498 | } | |
2499 | ||
f690808e | 2500 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2501 | .start = ipmr_vif_seq_start, |
2502 | .next = ipmr_vif_seq_next, | |
2503 | .stop = ipmr_vif_seq_stop, | |
2504 | .show = ipmr_vif_seq_show, | |
2505 | }; | |
2506 | ||
2507 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2508 | { | |
f6bb4514 BT |
2509 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2510 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2511 | } |
2512 | ||
9a32144e | 2513 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2514 | .owner = THIS_MODULE, |
2515 | .open = ipmr_vif_open, | |
2516 | .read = seq_read, | |
2517 | .llseek = seq_lseek, | |
f6bb4514 | 2518 | .release = seq_release_net, |
1da177e4 LT |
2519 | }; |
2520 | ||
2521 | struct ipmr_mfc_iter { | |
f6bb4514 | 2522 | struct seq_net_private p; |
f0ad0860 | 2523 | struct mr_table *mrt; |
862465f2 | 2524 | struct list_head *cache; |
1da177e4 LT |
2525 | int ct; |
2526 | }; | |
2527 | ||
2528 | ||
f6bb4514 BT |
2529 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2530 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2531 | { |
f0ad0860 | 2532 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2533 | struct mfc_cache *mfc; |
2534 | ||
a8c9486b | 2535 | rcu_read_lock(); |
862465f2 | 2536 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2537 | it->cache = &mrt->mfc_cache_array[it->ct]; |
a8c9486b | 2538 | list_for_each_entry_rcu(mfc, it->cache, list) |
e905a9ed | 2539 | if (pos-- == 0) |
1da177e4 | 2540 | return mfc; |
862465f2 | 2541 | } |
a8c9486b | 2542 | rcu_read_unlock(); |
1da177e4 | 2543 | |
1da177e4 | 2544 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2545 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2546 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2547 | if (pos-- == 0) |
1da177e4 LT |
2548 | return mfc; |
2549 | spin_unlock_bh(&mfc_unres_lock); | |
2550 | ||
2551 | it->cache = NULL; | |
2552 | return NULL; | |
2553 | } | |
2554 | ||
2555 | ||
2556 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2557 | { | |
2558 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2559 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2560 | struct mr_table *mrt; |
f6bb4514 | 2561 | |
f0ad0860 PM |
2562 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
2563 | if (mrt == NULL) | |
2564 | return ERR_PTR(-ENOENT); | |
f6bb4514 | 2565 | |
f0ad0860 | 2566 | it->mrt = mrt; |
1da177e4 LT |
2567 | it->cache = NULL; |
2568 | it->ct = 0; | |
f6bb4514 | 2569 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2570 | : SEQ_START_TOKEN; |
2571 | } | |
2572 | ||
2573 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2574 | { | |
2575 | struct mfc_cache *mfc = v; | |
2576 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2577 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2578 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2579 | |
2580 | ++*pos; | |
2581 | ||
2582 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2583 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2584 | |
862465f2 PM |
2585 | if (mfc->list.next != it->cache) |
2586 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2587 | |
0c12295a | 2588 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2589 | goto end_of_list; |
2590 | ||
0c12295a | 2591 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2592 | |
2593 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2594 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2595 | if (list_empty(it->cache)) |
2596 | continue; | |
2597 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2598 | } |
2599 | ||
2600 | /* exhausted cache_array, show unresolved */ | |
a8c9486b | 2601 | rcu_read_unlock(); |
0c12295a | 2602 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2603 | it->ct = 0; |
e905a9ed | 2604 | |
1da177e4 | 2605 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2606 | if (!list_empty(it->cache)) |
2607 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 | 2608 | |
a8cb16dd | 2609 | end_of_list: |
1da177e4 LT |
2610 | spin_unlock_bh(&mfc_unres_lock); |
2611 | it->cache = NULL; | |
2612 | ||
2613 | return NULL; | |
2614 | } | |
2615 | ||
2616 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2617 | { | |
2618 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2619 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2620 | |
0c12295a | 2621 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2622 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2623 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
a8c9486b | 2624 | rcu_read_unlock(); |
1da177e4 LT |
2625 | } |
2626 | ||
2627 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2628 | { | |
2629 | int n; | |
2630 | ||
2631 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2632 | seq_puts(seq, |
1da177e4 LT |
2633 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2634 | } else { | |
2635 | const struct mfc_cache *mfc = v; | |
2636 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2637 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2638 | |
0eae88f3 ED |
2639 | seq_printf(seq, "%08X %08X %-3hd", |
2640 | (__force u32) mfc->mfc_mcastgrp, | |
2641 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2642 | mfc->mfc_parent); |
1da177e4 | 2643 | |
0c12295a | 2644 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2645 | seq_printf(seq, " %8lu %8lu %8lu", |
2646 | mfc->mfc_un.res.pkt, | |
2647 | mfc->mfc_un.res.bytes, | |
2648 | mfc->mfc_un.res.wrong_if); | |
132adf54 | 2649 | for (n = mfc->mfc_un.res.minvif; |
a8cb16dd | 2650 | n < mfc->mfc_un.res.maxvif; n++) { |
0c12295a | 2651 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2652 | mfc->mfc_un.res.ttls[n] < 255) |
2653 | seq_printf(seq, | |
e905a9ed | 2654 | " %2d:%-3d", |
1da177e4 LT |
2655 | n, mfc->mfc_un.res.ttls[n]); |
2656 | } | |
1ea472e2 BT |
2657 | } else { |
2658 | /* unresolved mfc_caches don't contain | |
2659 | * pkt, bytes and wrong_if values | |
2660 | */ | |
2661 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2662 | } |
2663 | seq_putc(seq, '\n'); | |
2664 | } | |
2665 | return 0; | |
2666 | } | |
2667 | ||
f690808e | 2668 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2669 | .start = ipmr_mfc_seq_start, |
2670 | .next = ipmr_mfc_seq_next, | |
2671 | .stop = ipmr_mfc_seq_stop, | |
2672 | .show = ipmr_mfc_seq_show, | |
2673 | }; | |
2674 | ||
2675 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2676 | { | |
f6bb4514 BT |
2677 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2678 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2679 | } |
2680 | ||
9a32144e | 2681 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2682 | .owner = THIS_MODULE, |
2683 | .open = ipmr_mfc_open, | |
2684 | .read = seq_read, | |
2685 | .llseek = seq_lseek, | |
f6bb4514 | 2686 | .release = seq_release_net, |
1da177e4 | 2687 | }; |
e905a9ed | 2688 | #endif |
1da177e4 LT |
2689 | |
2690 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2691 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2692 | .handler = pim_rcv, |
403dbb97 | 2693 | .netns_ok = 1, |
1da177e4 LT |
2694 | }; |
2695 | #endif | |
2696 | ||
2697 | ||
2698 | /* | |
2699 | * Setup for IP multicast routing | |
2700 | */ | |
cf958ae3 BT |
2701 | static int __net_init ipmr_net_init(struct net *net) |
2702 | { | |
f0ad0860 | 2703 | int err; |
cf958ae3 | 2704 | |
f0ad0860 PM |
2705 | err = ipmr_rules_init(net); |
2706 | if (err < 0) | |
cf958ae3 | 2707 | goto fail; |
f6bb4514 BT |
2708 | |
2709 | #ifdef CONFIG_PROC_FS | |
2710 | err = -ENOMEM; | |
d4beaa66 | 2711 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 2712 | goto proc_vif_fail; |
d4beaa66 | 2713 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
2714 | goto proc_cache_fail; |
2715 | #endif | |
2bb8b26c BT |
2716 | return 0; |
2717 | ||
f6bb4514 BT |
2718 | #ifdef CONFIG_PROC_FS |
2719 | proc_cache_fail: | |
ece31ffd | 2720 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 2721 | proc_vif_fail: |
f0ad0860 | 2722 | ipmr_rules_exit(net); |
f6bb4514 | 2723 | #endif |
cf958ae3 BT |
2724 | fail: |
2725 | return err; | |
2726 | } | |
2727 | ||
2728 | static void __net_exit ipmr_net_exit(struct net *net) | |
2729 | { | |
f6bb4514 | 2730 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
2731 | remove_proc_entry("ip_mr_cache", net->proc_net); |
2732 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 2733 | #endif |
f0ad0860 | 2734 | ipmr_rules_exit(net); |
cf958ae3 BT |
2735 | } |
2736 | ||
2737 | static struct pernet_operations ipmr_net_ops = { | |
2738 | .init = ipmr_net_init, | |
2739 | .exit = ipmr_net_exit, | |
2740 | }; | |
e905a9ed | 2741 | |
03d2f897 | 2742 | int __init ip_mr_init(void) |
1da177e4 | 2743 | { |
03d2f897 WC |
2744 | int err; |
2745 | ||
1da177e4 LT |
2746 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2747 | sizeof(struct mfc_cache), | |
a8c9486b | 2748 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 2749 | NULL); |
03d2f897 WC |
2750 | if (!mrt_cachep) |
2751 | return -ENOMEM; | |
2752 | ||
cf958ae3 BT |
2753 | err = register_pernet_subsys(&ipmr_net_ops); |
2754 | if (err) | |
2755 | goto reg_pernet_fail; | |
2756 | ||
03d2f897 WC |
2757 | err = register_netdevice_notifier(&ip_mr_notifier); |
2758 | if (err) | |
2759 | goto reg_notif_fail; | |
403dbb97 TG |
2760 | #ifdef CONFIG_IP_PIMSM_V2 |
2761 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 2762 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
2763 | err = -EAGAIN; |
2764 | goto add_proto_fail; | |
2765 | } | |
2766 | #endif | |
c7ac8679 GR |
2767 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
2768 | NULL, ipmr_rtm_dumproute, NULL); | |
03d2f897 | 2769 | return 0; |
f6bb4514 | 2770 | |
403dbb97 TG |
2771 | #ifdef CONFIG_IP_PIMSM_V2 |
2772 | add_proto_fail: | |
2773 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2774 | #endif | |
c3e38896 | 2775 | reg_notif_fail: |
cf958ae3 BT |
2776 | unregister_pernet_subsys(&ipmr_net_ops); |
2777 | reg_pernet_fail: | |
c3e38896 | 2778 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2779 | return err; |
1da177e4 | 2780 | } |