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Commit | Line | Data |
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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 | |
25 | * Relax this requrement to work with older peers. | |
26 | * | |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <asm/system.h> |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/timer.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/fcntl.h> | |
38 | #include <linux/stat.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/inet.h> | |
42 | #include <linux/netdevice.h> | |
43 | #include <linux/inetdevice.h> | |
44 | #include <linux/igmp.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/mroute.h> | |
48 | #include <linux/init.h> | |
46f25dff | 49 | #include <linux/if_ether.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
457c4cbc | 51 | #include <net/net_namespace.h> |
1da177e4 LT |
52 | #include <net/ip.h> |
53 | #include <net/protocol.h> | |
54 | #include <linux/skbuff.h> | |
14c85021 | 55 | #include <net/route.h> |
1da177e4 LT |
56 | #include <net/sock.h> |
57 | #include <net/icmp.h> | |
58 | #include <net/udp.h> | |
59 | #include <net/raw.h> | |
60 | #include <linux/notifier.h> | |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/netfilter_ipv4.h> | |
63 | #include <net/ipip.h> | |
64 | #include <net/checksum.h> | |
dc5fc579 | 65 | #include <net/netlink.h> |
f0ad0860 | 66 | #include <net/fib_rules.h> |
1da177e4 LT |
67 | |
68 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
69 | #define CONFIG_IP_PIMSM 1 | |
70 | #endif | |
71 | ||
0c12295a | 72 | struct mr_table { |
f0ad0860 PM |
73 | struct list_head list; |
74 | u32 id; | |
0c12295a PM |
75 | struct sock *mroute_sk; |
76 | struct timer_list ipmr_expire_timer; | |
77 | struct list_head mfc_unres_queue; | |
78 | struct list_head mfc_cache_array[MFC_LINES]; | |
79 | struct vif_device vif_table[MAXVIFS]; | |
80 | int maxvif; | |
81 | atomic_t cache_resolve_queue_len; | |
82 | int mroute_do_assert; | |
83 | int mroute_do_pim; | |
84 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
85 | int mroute_reg_vif_num; | |
86 | #endif | |
87 | }; | |
88 | ||
f0ad0860 PM |
89 | struct ipmr_rule { |
90 | struct fib_rule common; | |
91 | }; | |
92 | ||
93 | struct ipmr_result { | |
94 | struct mr_table *mrt; | |
95 | }; | |
96 | ||
1da177e4 LT |
97 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
98 | Note that the changes are semaphored via rtnl_lock. | |
99 | */ | |
100 | ||
101 | static DEFINE_RWLOCK(mrt_lock); | |
102 | ||
103 | /* | |
104 | * Multicast router control variables | |
105 | */ | |
106 | ||
0c12295a | 107 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 | 108 | |
1da177e4 LT |
109 | /* Special spinlock for queue of unresolved entries */ |
110 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
111 | ||
112 | /* We return to original Alan's scheme. Hash table of resolved | |
113 | entries is changed only in process context and protected | |
114 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
115 | with strong spinlock mfc_unres_lock. | |
116 | ||
117 | In this case data path is free of exclusive locks at all. | |
118 | */ | |
119 | ||
e18b890b | 120 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 121 | |
f0ad0860 | 122 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
0c12295a PM |
123 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
124 | struct sk_buff *skb, struct mfc_cache *cache, | |
125 | int local); | |
126 | static int ipmr_cache_report(struct mr_table *mrt, | |
4feb88e5 | 127 | struct sk_buff *pkt, vifi_t vifi, int assert); |
0c12295a | 128 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
d658f8a0 | 129 | struct mfc_cache *c, struct rtmsg *rtm); |
f0ad0860 PM |
130 | static void ipmr_expire_process(unsigned long arg); |
131 | ||
132 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
133 | #define ipmr_for_each_table(mrt, net) \ | |
134 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
135 | ||
136 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
137 | { | |
138 | struct mr_table *mrt; | |
139 | ||
140 | ipmr_for_each_table(mrt, net) { | |
141 | if (mrt->id == id) | |
142 | return mrt; | |
143 | } | |
144 | return NULL; | |
145 | } | |
146 | ||
147 | static int ipmr_fib_lookup(struct net *net, struct flowi *flp, | |
148 | struct mr_table **mrt) | |
149 | { | |
150 | struct ipmr_result res; | |
151 | struct fib_lookup_arg arg = { .result = &res, }; | |
152 | int err; | |
153 | ||
154 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, flp, 0, &arg); | |
155 | if (err < 0) | |
156 | return err; | |
157 | *mrt = res.mrt; | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
162 | int flags, struct fib_lookup_arg *arg) | |
163 | { | |
164 | struct ipmr_result *res = arg->result; | |
165 | struct mr_table *mrt; | |
166 | ||
167 | switch (rule->action) { | |
168 | case FR_ACT_TO_TBL: | |
169 | break; | |
170 | case FR_ACT_UNREACHABLE: | |
171 | return -ENETUNREACH; | |
172 | case FR_ACT_PROHIBIT: | |
173 | return -EACCES; | |
174 | case FR_ACT_BLACKHOLE: | |
175 | default: | |
176 | return -EINVAL; | |
177 | } | |
178 | ||
179 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
180 | if (mrt == NULL) | |
181 | return -EAGAIN; | |
182 | res->mrt = mrt; | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
187 | { | |
188 | return 1; | |
189 | } | |
190 | ||
191 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
192 | FRA_GENERIC_POLICY, | |
193 | }; | |
194 | ||
195 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
196 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
197 | { | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
202 | struct nlattr **tb) | |
203 | { | |
204 | return 1; | |
205 | } | |
206 | ||
207 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
208 | struct fib_rule_hdr *frh) | |
209 | { | |
210 | frh->dst_len = 0; | |
211 | frh->src_len = 0; | |
212 | frh->tos = 0; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static struct fib_rules_ops ipmr_rules_ops_template = { | |
217 | .family = FIB_RULES_IPMR, | |
218 | .rule_size = sizeof(struct ipmr_rule), | |
219 | .addr_size = sizeof(u32), | |
220 | .action = ipmr_rule_action, | |
221 | .match = ipmr_rule_match, | |
222 | .configure = ipmr_rule_configure, | |
223 | .compare = ipmr_rule_compare, | |
224 | .default_pref = fib_default_rule_pref, | |
225 | .fill = ipmr_rule_fill, | |
226 | .nlgroup = RTNLGRP_IPV4_RULE, | |
227 | .policy = ipmr_rule_policy, | |
228 | .owner = THIS_MODULE, | |
229 | }; | |
230 | ||
231 | static int __net_init ipmr_rules_init(struct net *net) | |
232 | { | |
233 | struct fib_rules_ops *ops; | |
234 | struct mr_table *mrt; | |
235 | int err; | |
236 | ||
237 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
238 | if (IS_ERR(ops)) | |
239 | return PTR_ERR(ops); | |
240 | ||
241 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
242 | ||
243 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
244 | if (mrt == NULL) { | |
245 | err = -ENOMEM; | |
246 | goto err1; | |
247 | } | |
248 | ||
249 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
250 | if (err < 0) | |
251 | goto err2; | |
252 | ||
253 | net->ipv4.mr_rules_ops = ops; | |
254 | return 0; | |
255 | ||
256 | err2: | |
257 | kfree(mrt); | |
258 | err1: | |
259 | fib_rules_unregister(ops); | |
260 | return err; | |
261 | } | |
262 | ||
263 | static void __net_exit ipmr_rules_exit(struct net *net) | |
264 | { | |
265 | struct mr_table *mrt, *next; | |
266 | ||
267 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) | |
268 | kfree(mrt); | |
269 | fib_rules_unregister(net->ipv4.mr_rules_ops); | |
270 | } | |
271 | #else | |
272 | #define ipmr_for_each_table(mrt, net) \ | |
273 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
274 | ||
275 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
276 | { | |
277 | return net->ipv4.mrt; | |
278 | } | |
279 | ||
280 | static int ipmr_fib_lookup(struct net *net, struct flowi *flp, | |
281 | struct mr_table **mrt) | |
282 | { | |
283 | *mrt = net->ipv4.mrt; | |
284 | return 0; | |
285 | } | |
286 | ||
287 | static int __net_init ipmr_rules_init(struct net *net) | |
288 | { | |
289 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
290 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
291 | } | |
292 | ||
293 | static void __net_exit ipmr_rules_exit(struct net *net) | |
294 | { | |
295 | kfree(net->ipv4.mrt); | |
296 | } | |
297 | #endif | |
298 | ||
299 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
300 | { | |
301 | struct mr_table *mrt; | |
302 | unsigned int i; | |
303 | ||
304 | mrt = ipmr_get_table(net, id); | |
305 | if (mrt != NULL) | |
306 | return mrt; | |
307 | ||
308 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
309 | if (mrt == NULL) | |
310 | return NULL; | |
311 | mrt->id = id; | |
312 | ||
313 | /* Forwarding cache */ | |
314 | for (i = 0; i < MFC_LINES; i++) | |
315 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
316 | ||
317 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
318 | ||
319 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
320 | (unsigned long)mrt); | |
321 | ||
322 | #ifdef CONFIG_IP_PIMSM | |
323 | mrt->mroute_reg_vif_num = -1; | |
324 | #endif | |
325 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
326 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
327 | #endif | |
328 | return mrt; | |
329 | } | |
1da177e4 | 330 | |
1da177e4 LT |
331 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
332 | ||
d607032d WC |
333 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
334 | { | |
4feb88e5 BT |
335 | struct net *net = dev_net(dev); |
336 | ||
d607032d WC |
337 | dev_close(dev); |
338 | ||
4feb88e5 | 339 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 340 | if (dev) { |
5bc3eb7e | 341 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 342 | struct ifreq ifr; |
d607032d WC |
343 | struct ip_tunnel_parm p; |
344 | ||
345 | memset(&p, 0, sizeof(p)); | |
346 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
347 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
348 | p.iph.version = 4; | |
349 | p.iph.ihl = 5; | |
350 | p.iph.protocol = IPPROTO_IPIP; | |
351 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
352 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
353 | ||
5bc3eb7e SH |
354 | if (ops->ndo_do_ioctl) { |
355 | mm_segment_t oldfs = get_fs(); | |
356 | ||
357 | set_fs(KERNEL_DS); | |
358 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
359 | set_fs(oldfs); | |
360 | } | |
d607032d WC |
361 | } |
362 | } | |
363 | ||
1da177e4 | 364 | static |
4feb88e5 | 365 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
366 | { |
367 | struct net_device *dev; | |
368 | ||
4feb88e5 | 369 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
370 | |
371 | if (dev) { | |
5bc3eb7e | 372 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
373 | int err; |
374 | struct ifreq ifr; | |
1da177e4 LT |
375 | struct ip_tunnel_parm p; |
376 | struct in_device *in_dev; | |
377 | ||
378 | memset(&p, 0, sizeof(p)); | |
379 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
380 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
381 | p.iph.version = 4; | |
382 | p.iph.ihl = 5; | |
383 | p.iph.protocol = IPPROTO_IPIP; | |
384 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 385 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 386 | |
5bc3eb7e SH |
387 | if (ops->ndo_do_ioctl) { |
388 | mm_segment_t oldfs = get_fs(); | |
389 | ||
390 | set_fs(KERNEL_DS); | |
391 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
392 | set_fs(oldfs); | |
393 | } else | |
394 | err = -EOPNOTSUPP; | |
1da177e4 LT |
395 | |
396 | dev = NULL; | |
397 | ||
4feb88e5 BT |
398 | if (err == 0 && |
399 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
400 | dev->flags |= IFF_MULTICAST; |
401 | ||
e5ed6399 | 402 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 403 | if (in_dev == NULL) |
1da177e4 | 404 | goto failure; |
71e27da9 HX |
405 | |
406 | ipv4_devconf_setall(in_dev); | |
407 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
408 | |
409 | if (dev_open(dev)) | |
410 | goto failure; | |
7dc00c82 | 411 | dev_hold(dev); |
1da177e4 LT |
412 | } |
413 | } | |
414 | return dev; | |
415 | ||
416 | failure: | |
417 | /* allow the register to be completed before unregistering. */ | |
418 | rtnl_unlock(); | |
419 | rtnl_lock(); | |
420 | ||
421 | unregister_netdevice(dev); | |
422 | return NULL; | |
423 | } | |
424 | ||
425 | #ifdef CONFIG_IP_PIMSM | |
426 | ||
6fef4c0c | 427 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 428 | { |
4feb88e5 | 429 | struct net *net = dev_net(dev); |
f0ad0860 PM |
430 | struct mr_table *mrt; |
431 | struct flowi fl = { | |
432 | .oif = dev->ifindex, | |
433 | .iif = skb->skb_iif, | |
434 | .mark = skb->mark, | |
435 | }; | |
436 | int err; | |
437 | ||
438 | err = ipmr_fib_lookup(net, &fl, &mrt); | |
439 | if (err < 0) | |
440 | return err; | |
4feb88e5 | 441 | |
1da177e4 | 442 | read_lock(&mrt_lock); |
cf3677ae PE |
443 | dev->stats.tx_bytes += skb->len; |
444 | dev->stats.tx_packets++; | |
0c12295a | 445 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
446 | read_unlock(&mrt_lock); |
447 | kfree_skb(skb); | |
6ed10654 | 448 | return NETDEV_TX_OK; |
1da177e4 LT |
449 | } |
450 | ||
007c3838 SH |
451 | static const struct net_device_ops reg_vif_netdev_ops = { |
452 | .ndo_start_xmit = reg_vif_xmit, | |
453 | }; | |
454 | ||
1da177e4 LT |
455 | static void reg_vif_setup(struct net_device *dev) |
456 | { | |
457 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 458 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 459 | dev->flags = IFF_NOARP; |
007c3838 | 460 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 | 461 | dev->destructor = free_netdev; |
403dbb97 | 462 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
463 | } |
464 | ||
f0ad0860 | 465 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
466 | { |
467 | struct net_device *dev; | |
468 | struct in_device *in_dev; | |
f0ad0860 PM |
469 | char name[IFNAMSIZ]; |
470 | ||
471 | if (mrt->id == RT_TABLE_DEFAULT) | |
472 | sprintf(name, "pimreg"); | |
473 | else | |
474 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 475 | |
f0ad0860 | 476 | dev = alloc_netdev(0, name, reg_vif_setup); |
1da177e4 LT |
477 | |
478 | if (dev == NULL) | |
479 | return NULL; | |
480 | ||
403dbb97 TG |
481 | dev_net_set(dev, net); |
482 | ||
1da177e4 LT |
483 | if (register_netdevice(dev)) { |
484 | free_netdev(dev); | |
485 | return NULL; | |
486 | } | |
487 | dev->iflink = 0; | |
488 | ||
71e27da9 HX |
489 | rcu_read_lock(); |
490 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
491 | rcu_read_unlock(); | |
1da177e4 | 492 | goto failure; |
71e27da9 | 493 | } |
1da177e4 | 494 | |
71e27da9 HX |
495 | ipv4_devconf_setall(in_dev); |
496 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
497 | rcu_read_unlock(); | |
1da177e4 LT |
498 | |
499 | if (dev_open(dev)) | |
500 | goto failure; | |
501 | ||
7dc00c82 WC |
502 | dev_hold(dev); |
503 | ||
1da177e4 LT |
504 | return dev; |
505 | ||
506 | failure: | |
507 | /* allow the register to be completed before unregistering. */ | |
508 | rtnl_unlock(); | |
509 | rtnl_lock(); | |
510 | ||
511 | unregister_netdevice(dev); | |
512 | return NULL; | |
513 | } | |
514 | #endif | |
515 | ||
516 | /* | |
517 | * Delete a VIF entry | |
7dc00c82 | 518 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 519 | */ |
e905a9ed | 520 | |
0c12295a | 521 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 522 | struct list_head *head) |
1da177e4 LT |
523 | { |
524 | struct vif_device *v; | |
525 | struct net_device *dev; | |
526 | struct in_device *in_dev; | |
527 | ||
0c12295a | 528 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
529 | return -EADDRNOTAVAIL; |
530 | ||
0c12295a | 531 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
532 | |
533 | write_lock_bh(&mrt_lock); | |
534 | dev = v->dev; | |
535 | v->dev = NULL; | |
536 | ||
537 | if (!dev) { | |
538 | write_unlock_bh(&mrt_lock); | |
539 | return -EADDRNOTAVAIL; | |
540 | } | |
541 | ||
542 | #ifdef CONFIG_IP_PIMSM | |
0c12295a PM |
543 | if (vifi == mrt->mroute_reg_vif_num) |
544 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 LT |
545 | #endif |
546 | ||
0c12295a | 547 | if (vifi+1 == mrt->maxvif) { |
1da177e4 LT |
548 | int tmp; |
549 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
0c12295a | 550 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
551 | break; |
552 | } | |
0c12295a | 553 | mrt->maxvif = tmp+1; |
1da177e4 LT |
554 | } |
555 | ||
556 | write_unlock_bh(&mrt_lock); | |
557 | ||
558 | dev_set_allmulti(dev, -1); | |
559 | ||
e5ed6399 | 560 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 561 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
562 | ip_rt_multicast_event(in_dev); |
563 | } | |
564 | ||
7dc00c82 | 565 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
d17fa6fa | 566 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
567 | |
568 | dev_put(dev); | |
569 | return 0; | |
570 | } | |
571 | ||
5c0a66f5 BT |
572 | static inline void ipmr_cache_free(struct mfc_cache *c) |
573 | { | |
5c0a66f5 BT |
574 | kmem_cache_free(mrt_cachep, c); |
575 | } | |
576 | ||
1da177e4 LT |
577 | /* Destroy an unresolved cache entry, killing queued skbs |
578 | and reporting error to netlink readers. | |
579 | */ | |
580 | ||
0c12295a | 581 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 582 | { |
0c12295a | 583 | struct net *net = NULL; //mrt->net; |
1da177e4 | 584 | struct sk_buff *skb; |
9ef1d4c7 | 585 | struct nlmsgerr *e; |
1da177e4 | 586 | |
0c12295a | 587 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 588 | |
c354e124 | 589 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 590 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
591 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
592 | nlh->nlmsg_type = NLMSG_ERROR; | |
593 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
594 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
595 | e = NLMSG_DATA(nlh); |
596 | e->error = -ETIMEDOUT; | |
597 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 598 | |
4feb88e5 | 599 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 LT |
600 | } else |
601 | kfree_skb(skb); | |
602 | } | |
603 | ||
5c0a66f5 | 604 | ipmr_cache_free(c); |
1da177e4 LT |
605 | } |
606 | ||
607 | ||
e258beb2 | 608 | /* Timer process for the unresolved queue. */ |
1da177e4 | 609 | |
e258beb2 | 610 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 611 | { |
0c12295a | 612 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
613 | unsigned long now; |
614 | unsigned long expires; | |
862465f2 | 615 | struct mfc_cache *c, *next; |
1da177e4 LT |
616 | |
617 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 618 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
619 | return; |
620 | } | |
621 | ||
0c12295a | 622 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
623 | goto out; |
624 | ||
625 | now = jiffies; | |
626 | expires = 10*HZ; | |
1da177e4 | 627 | |
0c12295a | 628 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
629 | if (time_after(c->mfc_un.unres.expires, now)) { |
630 | unsigned long interval = c->mfc_un.unres.expires - now; | |
631 | if (interval < expires) | |
632 | expires = interval; | |
1da177e4 LT |
633 | continue; |
634 | } | |
635 | ||
862465f2 | 636 | list_del(&c->list); |
0c12295a | 637 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
638 | } |
639 | ||
0c12295a PM |
640 | if (!list_empty(&mrt->mfc_unres_queue)) |
641 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
642 | |
643 | out: | |
644 | spin_unlock(&mfc_unres_lock); | |
645 | } | |
646 | ||
647 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
648 | ||
0c12295a | 649 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 650 | unsigned char *ttls) |
1da177e4 LT |
651 | { |
652 | int vifi; | |
653 | ||
654 | cache->mfc_un.res.minvif = MAXVIFS; | |
655 | cache->mfc_un.res.maxvif = 0; | |
656 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
657 | ||
0c12295a PM |
658 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
659 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 660 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
661 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
662 | if (cache->mfc_un.res.minvif > vifi) | |
663 | cache->mfc_un.res.minvif = vifi; | |
664 | if (cache->mfc_un.res.maxvif <= vifi) | |
665 | cache->mfc_un.res.maxvif = vifi + 1; | |
666 | } | |
667 | } | |
668 | } | |
669 | ||
0c12295a PM |
670 | static int vif_add(struct net *net, struct mr_table *mrt, |
671 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
672 | { |
673 | int vifi = vifc->vifc_vifi; | |
0c12295a | 674 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
675 | struct net_device *dev; |
676 | struct in_device *in_dev; | |
d607032d | 677 | int err; |
1da177e4 LT |
678 | |
679 | /* Is vif busy ? */ | |
0c12295a | 680 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
681 | return -EADDRINUSE; |
682 | ||
683 | switch (vifc->vifc_flags) { | |
684 | #ifdef CONFIG_IP_PIMSM | |
685 | case VIFF_REGISTER: | |
686 | /* | |
687 | * Special Purpose VIF in PIM | |
688 | * All the packets will be sent to the daemon | |
689 | */ | |
0c12295a | 690 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 691 | return -EADDRINUSE; |
f0ad0860 | 692 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
693 | if (!dev) |
694 | return -ENOBUFS; | |
d607032d WC |
695 | err = dev_set_allmulti(dev, 1); |
696 | if (err) { | |
697 | unregister_netdevice(dev); | |
7dc00c82 | 698 | dev_put(dev); |
d607032d WC |
699 | return err; |
700 | } | |
1da177e4 LT |
701 | break; |
702 | #endif | |
e905a9ed | 703 | case VIFF_TUNNEL: |
4feb88e5 | 704 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
705 | if (!dev) |
706 | return -ENOBUFS; | |
d607032d WC |
707 | err = dev_set_allmulti(dev, 1); |
708 | if (err) { | |
709 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 710 | dev_put(dev); |
d607032d WC |
711 | return err; |
712 | } | |
1da177e4 | 713 | break; |
ee5e81f0 I |
714 | |
715 | case VIFF_USE_IFINDEX: | |
1da177e4 | 716 | case 0: |
ee5e81f0 I |
717 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
718 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
719 | if (dev && dev->ip_ptr == NULL) { | |
720 | dev_put(dev); | |
721 | return -EADDRNOTAVAIL; | |
722 | } | |
723 | } else | |
724 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); | |
725 | ||
1da177e4 LT |
726 | if (!dev) |
727 | return -EADDRNOTAVAIL; | |
d607032d | 728 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
729 | if (err) { |
730 | dev_put(dev); | |
d607032d | 731 | return err; |
7dc00c82 | 732 | } |
1da177e4 LT |
733 | break; |
734 | default: | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
d0490cfd DC |
738 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
739 | dev_put(dev); | |
1da177e4 | 740 | return -EADDRNOTAVAIL; |
d0490cfd | 741 | } |
42f811b8 | 742 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
743 | ip_rt_multicast_event(in_dev); |
744 | ||
745 | /* | |
746 | * Fill in the VIF structures | |
747 | */ | |
c354e124 JK |
748 | v->rate_limit = vifc->vifc_rate_limit; |
749 | v->local = vifc->vifc_lcl_addr.s_addr; | |
750 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
751 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
752 | if (!mrtsock) |
753 | v->flags |= VIFF_STATIC; | |
c354e124 | 754 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
755 | v->bytes_in = 0; |
756 | v->bytes_out = 0; | |
757 | v->pkt_in = 0; | |
758 | v->pkt_out = 0; | |
759 | v->link = dev->ifindex; | |
760 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
761 | v->link = dev->iflink; | |
762 | ||
763 | /* And finish update writing critical data */ | |
764 | write_lock_bh(&mrt_lock); | |
c354e124 | 765 | v->dev = dev; |
1da177e4 LT |
766 | #ifdef CONFIG_IP_PIMSM |
767 | if (v->flags&VIFF_REGISTER) | |
0c12295a | 768 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 769 | #endif |
0c12295a PM |
770 | if (vifi+1 > mrt->maxvif) |
771 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
772 | write_unlock_bh(&mrt_lock); |
773 | return 0; | |
774 | } | |
775 | ||
0c12295a | 776 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
777 | __be32 origin, |
778 | __be32 mcastgrp) | |
1da177e4 | 779 | { |
c354e124 | 780 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
781 | struct mfc_cache *c; |
782 | ||
0c12295a | 783 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
784 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
785 | return c; | |
1da177e4 | 786 | } |
862465f2 | 787 | return NULL; |
1da177e4 LT |
788 | } |
789 | ||
790 | /* | |
791 | * Allocate a multicast cache entry | |
792 | */ | |
d658f8a0 | 793 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 794 | { |
c354e124 JK |
795 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
796 | if (c == NULL) | |
1da177e4 | 797 | return NULL; |
1da177e4 LT |
798 | c->mfc_un.res.minvif = MAXVIFS; |
799 | return c; | |
800 | } | |
801 | ||
d658f8a0 | 802 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 803 | { |
c354e124 JK |
804 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
805 | if (c == NULL) | |
1da177e4 | 806 | return NULL; |
1da177e4 LT |
807 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
808 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
809 | return c; | |
810 | } | |
811 | ||
812 | /* | |
813 | * A cache entry has gone into a resolved state from queued | |
814 | */ | |
e905a9ed | 815 | |
0c12295a PM |
816 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
817 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
818 | { |
819 | struct sk_buff *skb; | |
9ef1d4c7 | 820 | struct nlmsgerr *e; |
1da177e4 LT |
821 | |
822 | /* | |
823 | * Play the pending entries through our router | |
824 | */ | |
825 | ||
c354e124 | 826 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 827 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
828 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
829 | ||
0c12295a | 830 | if (ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
27a884dc ACM |
831 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
832 | (u8 *)nlh); | |
1da177e4 LT |
833 | } else { |
834 | nlh->nlmsg_type = NLMSG_ERROR; | |
835 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
836 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
837 | e = NLMSG_DATA(nlh); |
838 | e->error = -EMSGSIZE; | |
839 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 840 | } |
2942e900 | 841 | |
d658f8a0 | 842 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 | 843 | } else |
0c12295a | 844 | ip_mr_forward(net, mrt, skb, c, 0); |
1da177e4 LT |
845 | } |
846 | } | |
847 | ||
848 | /* | |
849 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
850 | * expects the following bizarre scheme. | |
851 | * | |
852 | * Called under mrt_lock. | |
853 | */ | |
e905a9ed | 854 | |
0c12295a | 855 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 856 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
857 | { |
858 | struct sk_buff *skb; | |
c9bdd4b5 | 859 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
860 | struct igmphdr *igmp; |
861 | struct igmpmsg *msg; | |
862 | int ret; | |
863 | ||
864 | #ifdef CONFIG_IP_PIMSM | |
865 | if (assert == IGMPMSG_WHOLEPKT) | |
866 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
867 | else | |
868 | #endif | |
869 | skb = alloc_skb(128, GFP_ATOMIC); | |
870 | ||
132adf54 | 871 | if (!skb) |
1da177e4 LT |
872 | return -ENOBUFS; |
873 | ||
874 | #ifdef CONFIG_IP_PIMSM | |
875 | if (assert == IGMPMSG_WHOLEPKT) { | |
876 | /* Ugly, but we have no choice with this interface. | |
877 | Duplicate old header, fix ihl, length etc. | |
878 | And all this only to mangle msg->im_msgtype and | |
879 | to set msg->im_mbz to "mbz" :-) | |
880 | */ | |
878c8145 ACM |
881 | skb_push(skb, sizeof(struct iphdr)); |
882 | skb_reset_network_header(skb); | |
badff6d0 | 883 | skb_reset_transport_header(skb); |
0272ffc4 | 884 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 885 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
886 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
887 | msg->im_mbz = 0; | |
0c12295a | 888 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
889 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
890 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
891 | sizeof(struct iphdr)); | |
e905a9ed | 892 | } else |
1da177e4 | 893 | #endif |
e905a9ed YH |
894 | { |
895 | ||
1da177e4 LT |
896 | /* |
897 | * Copy the IP header | |
898 | */ | |
899 | ||
27a884dc | 900 | skb->network_header = skb->tail; |
ddc7b8e3 | 901 | skb_put(skb, ihl); |
27d7ff46 | 902 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
903 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
904 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 | 905 | msg->im_vif = vifi; |
adf30907 | 906 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 LT |
907 | |
908 | /* | |
909 | * Add our header | |
910 | */ | |
911 | ||
c354e124 | 912 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
913 | igmp->type = |
914 | msg->im_msgtype = assert; | |
915 | igmp->code = 0; | |
eddc9ec5 | 916 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 917 | skb->transport_header = skb->network_header; |
e905a9ed | 918 | } |
1da177e4 | 919 | |
0c12295a | 920 | if (mrt->mroute_sk == NULL) { |
1da177e4 LT |
921 | kfree_skb(skb); |
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Deliver to mrouted | |
927 | */ | |
0c12295a | 928 | ret = sock_queue_rcv_skb(mrt->mroute_sk, skb); |
70a269e6 | 929 | if (ret < 0) { |
1da177e4 LT |
930 | if (net_ratelimit()) |
931 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
932 | kfree_skb(skb); | |
933 | } | |
934 | ||
935 | return ret; | |
936 | } | |
937 | ||
938 | /* | |
939 | * Queue a packet for resolution. It gets locked cache entry! | |
940 | */ | |
e905a9ed | 941 | |
1da177e4 | 942 | static int |
0c12295a | 943 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 944 | { |
862465f2 | 945 | bool found = false; |
1da177e4 LT |
946 | int err; |
947 | struct mfc_cache *c; | |
eddc9ec5 | 948 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
949 | |
950 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 951 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 952 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
953 | c->mfc_origin == iph->saddr) { |
954 | found = true; | |
1da177e4 | 955 | break; |
862465f2 | 956 | } |
1da177e4 LT |
957 | } |
958 | ||
862465f2 | 959 | if (!found) { |
1da177e4 LT |
960 | /* |
961 | * Create a new entry if allowable | |
962 | */ | |
963 | ||
0c12295a | 964 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 965 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
966 | spin_unlock_bh(&mfc_unres_lock); |
967 | ||
968 | kfree_skb(skb); | |
969 | return -ENOBUFS; | |
970 | } | |
971 | ||
972 | /* | |
973 | * Fill in the new cache entry | |
974 | */ | |
eddc9ec5 ACM |
975 | c->mfc_parent = -1; |
976 | c->mfc_origin = iph->saddr; | |
977 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
978 | |
979 | /* | |
980 | * Reflect first query at mrouted. | |
981 | */ | |
0c12295a | 982 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 983 | if (err < 0) { |
e905a9ed | 984 | /* If the report failed throw the cache entry |
1da177e4 LT |
985 | out - Brad Parker |
986 | */ | |
987 | spin_unlock_bh(&mfc_unres_lock); | |
988 | ||
5c0a66f5 | 989 | ipmr_cache_free(c); |
1da177e4 LT |
990 | kfree_skb(skb); |
991 | return err; | |
992 | } | |
993 | ||
0c12295a PM |
994 | atomic_inc(&mrt->cache_resolve_queue_len); |
995 | list_add(&c->list, &mrt->mfc_unres_queue); | |
1da177e4 | 996 | |
0c12295a | 997 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); |
1da177e4 LT |
998 | } |
999 | ||
1000 | /* | |
1001 | * See if we can append the packet | |
1002 | */ | |
1003 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
1004 | kfree_skb(skb); | |
1005 | err = -ENOBUFS; | |
1006 | } else { | |
c354e124 | 1007 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1008 | err = 0; |
1009 | } | |
1010 | ||
1011 | spin_unlock_bh(&mfc_unres_lock); | |
1012 | return err; | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * MFC cache manipulation by user space mroute daemon | |
1017 | */ | |
1018 | ||
0c12295a | 1019 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc) |
1da177e4 LT |
1020 | { |
1021 | int line; | |
862465f2 | 1022 | struct mfc_cache *c, *next; |
1da177e4 | 1023 | |
c354e124 | 1024 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1025 | |
0c12295a | 1026 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 LT |
1027 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
1028 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
1029 | write_lock_bh(&mrt_lock); | |
862465f2 | 1030 | list_del(&c->list); |
1da177e4 LT |
1031 | write_unlock_bh(&mrt_lock); |
1032 | ||
5c0a66f5 | 1033 | ipmr_cache_free(c); |
1da177e4 LT |
1034 | return 0; |
1035 | } | |
1036 | } | |
1037 | return -ENOENT; | |
1038 | } | |
1039 | ||
0c12295a PM |
1040 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
1041 | struct mfcctl *mfc, int mrtsock) | |
1da177e4 | 1042 | { |
862465f2 | 1043 | bool found = false; |
1da177e4 | 1044 | int line; |
862465f2 | 1045 | struct mfc_cache *uc, *c; |
1da177e4 | 1046 | |
a50436f2 PM |
1047 | if (mfc->mfcc_parent >= MAXVIFS) |
1048 | return -ENFILE; | |
1049 | ||
c354e124 | 1050 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1051 | |
0c12295a | 1052 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1053 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
862465f2 PM |
1054 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { |
1055 | found = true; | |
1da177e4 | 1056 | break; |
862465f2 | 1057 | } |
1da177e4 LT |
1058 | } |
1059 | ||
862465f2 | 1060 | if (found) { |
1da177e4 LT |
1061 | write_lock_bh(&mrt_lock); |
1062 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1063 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1064 | if (!mrtsock) |
1065 | c->mfc_flags |= MFC_STATIC; | |
1066 | write_unlock_bh(&mrt_lock); | |
1067 | return 0; | |
1068 | } | |
1069 | ||
f97c1e0c | 1070 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1071 | return -EINVAL; |
1072 | ||
d658f8a0 | 1073 | c = ipmr_cache_alloc(); |
c354e124 | 1074 | if (c == NULL) |
1da177e4 LT |
1075 | return -ENOMEM; |
1076 | ||
c354e124 JK |
1077 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1078 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1079 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1080 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1081 | if (!mrtsock) |
1082 | c->mfc_flags |= MFC_STATIC; | |
1083 | ||
1084 | write_lock_bh(&mrt_lock); | |
0c12295a | 1085 | list_add(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1086 | write_unlock_bh(&mrt_lock); |
1087 | ||
1088 | /* | |
1089 | * Check to see if we resolved a queued list. If so we | |
1090 | * need to send on the frames and tidy up. | |
1091 | */ | |
1092 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1093 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1094 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1095 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1096 | list_del(&uc->list); |
0c12295a | 1097 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 LT |
1098 | break; |
1099 | } | |
1100 | } | |
0c12295a PM |
1101 | if (list_empty(&mrt->mfc_unres_queue)) |
1102 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1103 | spin_unlock_bh(&mfc_unres_lock); |
1104 | ||
1105 | if (uc) { | |
0c12295a | 1106 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1107 | ipmr_cache_free(uc); |
1da177e4 LT |
1108 | } |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Close the multicast socket, and clear the vif tables etc | |
1114 | */ | |
e905a9ed | 1115 | |
0c12295a | 1116 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1117 | { |
1118 | int i; | |
d17fa6fa | 1119 | LIST_HEAD(list); |
862465f2 | 1120 | struct mfc_cache *c, *next; |
e905a9ed | 1121 | |
1da177e4 LT |
1122 | /* |
1123 | * Shut down all active vif entries | |
1124 | */ | |
0c12295a PM |
1125 | for (i = 0; i < mrt->maxvif; i++) { |
1126 | if (!(mrt->vif_table[i].flags&VIFF_STATIC)) | |
1127 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1128 | } |
d17fa6fa | 1129 | unregister_netdevice_many(&list); |
1da177e4 LT |
1130 | |
1131 | /* | |
1132 | * Wipe the cache | |
1133 | */ | |
862465f2 | 1134 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1135 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
862465f2 | 1136 | if (c->mfc_flags&MFC_STATIC) |
1da177e4 | 1137 | continue; |
1da177e4 | 1138 | write_lock_bh(&mrt_lock); |
862465f2 | 1139 | list_del(&c->list); |
1da177e4 LT |
1140 | write_unlock_bh(&mrt_lock); |
1141 | ||
5c0a66f5 | 1142 | ipmr_cache_free(c); |
1da177e4 LT |
1143 | } |
1144 | } | |
1145 | ||
0c12295a | 1146 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1147 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1148 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1149 | list_del(&c->list); |
0c12295a | 1150 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1151 | } |
1152 | spin_unlock_bh(&mfc_unres_lock); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | static void mrtsock_destruct(struct sock *sk) | |
1157 | { | |
4feb88e5 | 1158 | struct net *net = sock_net(sk); |
f0ad0860 | 1159 | struct mr_table *mrt; |
4feb88e5 | 1160 | |
1da177e4 | 1161 | rtnl_lock(); |
f0ad0860 PM |
1162 | ipmr_for_each_table(mrt, net) { |
1163 | if (sk == mrt->mroute_sk) { | |
1164 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; | |
1da177e4 | 1165 | |
f0ad0860 PM |
1166 | write_lock_bh(&mrt_lock); |
1167 | mrt->mroute_sk = NULL; | |
1168 | write_unlock_bh(&mrt_lock); | |
1da177e4 | 1169 | |
f0ad0860 PM |
1170 | mroute_clean_tables(mrt); |
1171 | } | |
1da177e4 LT |
1172 | } |
1173 | rtnl_unlock(); | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Socket options and virtual interface manipulation. The whole | |
1178 | * virtual interface system is a complete heap, but unfortunately | |
1179 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1180 | * MOSPF/PIM router set up we can clean this up. | |
1181 | */ | |
e905a9ed | 1182 | |
b7058842 | 1183 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1184 | { |
1185 | int ret; | |
1186 | struct vifctl vif; | |
1187 | struct mfcctl mfc; | |
4feb88e5 | 1188 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1189 | struct mr_table *mrt; |
1190 | ||
1191 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1192 | if (mrt == NULL) | |
1193 | return -ENOENT; | |
e905a9ed | 1194 | |
132adf54 | 1195 | if (optname != MRT_INIT) { |
0c12295a | 1196 | if (sk != mrt->mroute_sk && !capable(CAP_NET_ADMIN)) |
1da177e4 LT |
1197 | return -EACCES; |
1198 | } | |
1199 | ||
132adf54 SH |
1200 | switch (optname) { |
1201 | case MRT_INIT: | |
1202 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1203 | inet_sk(sk)->inet_num != IPPROTO_IGMP) |
132adf54 | 1204 | return -EOPNOTSUPP; |
c354e124 | 1205 | if (optlen != sizeof(int)) |
132adf54 | 1206 | return -ENOPROTOOPT; |
1da177e4 | 1207 | |
132adf54 | 1208 | rtnl_lock(); |
0c12295a | 1209 | if (mrt->mroute_sk) { |
1da177e4 | 1210 | rtnl_unlock(); |
132adf54 SH |
1211 | return -EADDRINUSE; |
1212 | } | |
1213 | ||
1214 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1215 | if (ret == 0) { | |
1216 | write_lock_bh(&mrt_lock); | |
0c12295a | 1217 | mrt->mroute_sk = sk; |
132adf54 SH |
1218 | write_unlock_bh(&mrt_lock); |
1219 | ||
4feb88e5 | 1220 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
132adf54 SH |
1221 | } |
1222 | rtnl_unlock(); | |
1223 | return ret; | |
1224 | case MRT_DONE: | |
0c12295a | 1225 | if (sk != mrt->mroute_sk) |
132adf54 SH |
1226 | return -EACCES; |
1227 | return ip_ra_control(sk, 0, NULL); | |
1228 | case MRT_ADD_VIF: | |
1229 | case MRT_DEL_VIF: | |
c354e124 | 1230 | if (optlen != sizeof(vif)) |
132adf54 | 1231 | return -EINVAL; |
c354e124 | 1232 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1233 | return -EFAULT; |
1234 | if (vif.vifc_vifi >= MAXVIFS) | |
1235 | return -ENFILE; | |
1236 | rtnl_lock(); | |
c354e124 | 1237 | if (optname == MRT_ADD_VIF) { |
0c12295a | 1238 | ret = vif_add(net, mrt, &vif, sk == mrt->mroute_sk); |
132adf54 | 1239 | } else { |
0c12295a | 1240 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1241 | } |
1242 | rtnl_unlock(); | |
1243 | return ret; | |
1da177e4 LT |
1244 | |
1245 | /* | |
1246 | * Manipulate the forwarding caches. These live | |
1247 | * in a sort of kernel/user symbiosis. | |
1248 | */ | |
132adf54 SH |
1249 | case MRT_ADD_MFC: |
1250 | case MRT_DEL_MFC: | |
c354e124 | 1251 | if (optlen != sizeof(mfc)) |
132adf54 | 1252 | return -EINVAL; |
c354e124 | 1253 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
1254 | return -EFAULT; |
1255 | rtnl_lock(); | |
c354e124 | 1256 | if (optname == MRT_DEL_MFC) |
0c12295a | 1257 | ret = ipmr_mfc_delete(mrt, &mfc); |
132adf54 | 1258 | else |
0c12295a | 1259 | ret = ipmr_mfc_add(net, mrt, &mfc, sk == mrt->mroute_sk); |
132adf54 SH |
1260 | rtnl_unlock(); |
1261 | return ret; | |
1da177e4 LT |
1262 | /* |
1263 | * Control PIM assert. | |
1264 | */ | |
132adf54 SH |
1265 | case MRT_ASSERT: |
1266 | { | |
1267 | int v; | |
1268 | if (get_user(v,(int __user *)optval)) | |
1269 | return -EFAULT; | |
0c12295a | 1270 | mrt->mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1271 | return 0; |
1272 | } | |
1da177e4 | 1273 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1274 | case MRT_PIM: |
1275 | { | |
ba93ef74 SH |
1276 | int v; |
1277 | ||
132adf54 SH |
1278 | if (get_user(v,(int __user *)optval)) |
1279 | return -EFAULT; | |
ba93ef74 SH |
1280 | v = (v) ? 1 : 0; |
1281 | ||
132adf54 SH |
1282 | rtnl_lock(); |
1283 | ret = 0; | |
0c12295a PM |
1284 | if (v != mrt->mroute_do_pim) { |
1285 | mrt->mroute_do_pim = v; | |
1286 | mrt->mroute_do_assert = v; | |
1da177e4 | 1287 | } |
132adf54 SH |
1288 | rtnl_unlock(); |
1289 | return ret; | |
1290 | } | |
f0ad0860 PM |
1291 | #endif |
1292 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1293 | case MRT_TABLE: | |
1294 | { | |
1295 | u32 v; | |
1296 | ||
1297 | if (optlen != sizeof(u32)) | |
1298 | return -EINVAL; | |
1299 | if (get_user(v, (u32 __user *)optval)) | |
1300 | return -EFAULT; | |
1301 | if (sk == mrt->mroute_sk) | |
1302 | return -EBUSY; | |
1303 | ||
1304 | rtnl_lock(); | |
1305 | ret = 0; | |
1306 | if (!ipmr_new_table(net, v)) | |
1307 | ret = -ENOMEM; | |
1308 | raw_sk(sk)->ipmr_table = v; | |
1309 | rtnl_unlock(); | |
1310 | return ret; | |
1311 | } | |
1da177e4 | 1312 | #endif |
132adf54 SH |
1313 | /* |
1314 | * Spurious command, or MRT_VERSION which you cannot | |
1315 | * set. | |
1316 | */ | |
1317 | default: | |
1318 | return -ENOPROTOOPT; | |
1da177e4 LT |
1319 | } |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Getsock opt support for the multicast routing system. | |
1324 | */ | |
e905a9ed | 1325 | |
c354e124 | 1326 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1327 | { |
1328 | int olr; | |
1329 | int val; | |
4feb88e5 | 1330 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1331 | struct mr_table *mrt; |
1332 | ||
1333 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1334 | if (mrt == NULL) | |
1335 | return -ENOENT; | |
1da177e4 | 1336 | |
c354e124 | 1337 | if (optname != MRT_VERSION && |
1da177e4 LT |
1338 | #ifdef CONFIG_IP_PIMSM |
1339 | optname!=MRT_PIM && | |
1340 | #endif | |
1341 | optname!=MRT_ASSERT) | |
1342 | return -ENOPROTOOPT; | |
1343 | ||
1344 | if (get_user(olr, optlen)) | |
1345 | return -EFAULT; | |
1346 | ||
1347 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1348 | if (olr < 0) | |
1349 | return -EINVAL; | |
e905a9ed | 1350 | |
c354e124 | 1351 | if (put_user(olr, optlen)) |
1da177e4 | 1352 | return -EFAULT; |
c354e124 JK |
1353 | if (optname == MRT_VERSION) |
1354 | val = 0x0305; | |
1da177e4 | 1355 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1356 | else if (optname == MRT_PIM) |
0c12295a | 1357 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1358 | #endif |
1359 | else | |
0c12295a | 1360 | val = mrt->mroute_do_assert; |
c354e124 | 1361 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1362 | return -EFAULT; |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * The IP multicast ioctl support routines. | |
1368 | */ | |
e905a9ed | 1369 | |
1da177e4 LT |
1370 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1371 | { | |
1372 | struct sioc_sg_req sr; | |
1373 | struct sioc_vif_req vr; | |
1374 | struct vif_device *vif; | |
1375 | struct mfc_cache *c; | |
4feb88e5 | 1376 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1377 | struct mr_table *mrt; |
1378 | ||
1379 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1380 | if (mrt == NULL) | |
1381 | return -ENOENT; | |
e905a9ed | 1382 | |
132adf54 SH |
1383 | switch (cmd) { |
1384 | case SIOCGETVIFCNT: | |
c354e124 | 1385 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1386 | return -EFAULT; |
0c12295a | 1387 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1388 | return -EINVAL; |
1389 | read_lock(&mrt_lock); | |
0c12295a PM |
1390 | vif = &mrt->vif_table[vr.vifi]; |
1391 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1392 | vr.icount = vif->pkt_in; |
1393 | vr.ocount = vif->pkt_out; | |
1394 | vr.ibytes = vif->bytes_in; | |
1395 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1396 | read_unlock(&mrt_lock); |
1da177e4 | 1397 | |
c354e124 | 1398 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1399 | return -EFAULT; |
1400 | return 0; | |
1401 | } | |
1402 | read_unlock(&mrt_lock); | |
1403 | return -EADDRNOTAVAIL; | |
1404 | case SIOCGETSGCNT: | |
c354e124 | 1405 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1406 | return -EFAULT; |
1407 | ||
1408 | read_lock(&mrt_lock); | |
0c12295a | 1409 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1410 | if (c) { |
1411 | sr.pktcnt = c->mfc_un.res.pkt; | |
1412 | sr.bytecnt = c->mfc_un.res.bytes; | |
1413 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1414 | read_unlock(&mrt_lock); |
132adf54 | 1415 | |
c354e124 | 1416 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1417 | return -EFAULT; |
1418 | return 0; | |
1419 | } | |
1420 | read_unlock(&mrt_lock); | |
1421 | return -EADDRNOTAVAIL; | |
1422 | default: | |
1423 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1424 | } |
1425 | } | |
1426 | ||
1427 | ||
1428 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1429 | { | |
e9dc8653 | 1430 | struct net_device *dev = ptr; |
4feb88e5 | 1431 | struct net *net = dev_net(dev); |
f0ad0860 | 1432 | struct mr_table *mrt; |
1da177e4 LT |
1433 | struct vif_device *v; |
1434 | int ct; | |
d17fa6fa | 1435 | LIST_HEAD(list); |
e9dc8653 | 1436 | |
1da177e4 LT |
1437 | if (event != NETDEV_UNREGISTER) |
1438 | return NOTIFY_DONE; | |
f0ad0860 PM |
1439 | |
1440 | ipmr_for_each_table(mrt, net) { | |
1441 | v = &mrt->vif_table[0]; | |
1442 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1443 | if (v->dev == dev) | |
1444 | vif_delete(mrt, ct, 1, &list); | |
1445 | } | |
1da177e4 | 1446 | } |
d17fa6fa | 1447 | unregister_netdevice_many(&list); |
1da177e4 LT |
1448 | return NOTIFY_DONE; |
1449 | } | |
1450 | ||
1451 | ||
c354e124 | 1452 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1453 | .notifier_call = ipmr_device_event, |
1454 | }; | |
1455 | ||
1456 | /* | |
1457 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1458 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1459 | * important for multicast video. | |
1460 | */ | |
e905a9ed | 1461 | |
114c7844 | 1462 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1463 | { |
8856dfa3 | 1464 | struct iphdr *iph; |
eddc9ec5 | 1465 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1466 | |
1467 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1468 | skb->transport_header = skb->network_header; |
8856dfa3 | 1469 | skb_reset_network_header(skb); |
eddc9ec5 | 1470 | iph = ip_hdr(skb); |
1da177e4 LT |
1471 | |
1472 | iph->version = 4; | |
e023dd64 ACM |
1473 | iph->tos = old_iph->tos; |
1474 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1475 | iph->frag_off = 0; |
1476 | iph->daddr = daddr; | |
1477 | iph->saddr = saddr; | |
1478 | iph->protocol = IPPROTO_IPIP; | |
1479 | iph->ihl = 5; | |
1480 | iph->tot_len = htons(skb->len); | |
adf30907 | 1481 | ip_select_ident(iph, skb_dst(skb), NULL); |
1da177e4 LT |
1482 | ip_send_check(iph); |
1483 | ||
1da177e4 LT |
1484 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1485 | nf_reset(skb); | |
1486 | } | |
1487 | ||
1488 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1489 | { | |
1490 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1491 | ||
adf30907 | 1492 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1493 | |
1494 | if (unlikely(opt->optlen)) | |
1495 | ip_forward_options(skb); | |
1496 | ||
1497 | return dst_output(skb); | |
1498 | } | |
1499 | ||
1500 | /* | |
1501 | * Processing handlers for ipmr_forward | |
1502 | */ | |
1503 | ||
0c12295a PM |
1504 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1505 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1506 | { |
eddc9ec5 | 1507 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1508 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1509 | struct net_device *dev; |
1510 | struct rtable *rt; | |
1511 | int encap = 0; | |
1512 | ||
1513 | if (vif->dev == NULL) | |
1514 | goto out_free; | |
1515 | ||
1516 | #ifdef CONFIG_IP_PIMSM | |
1517 | if (vif->flags & VIFF_REGISTER) { | |
1518 | vif->pkt_out++; | |
c354e124 | 1519 | vif->bytes_out += skb->len; |
cf3677ae PE |
1520 | vif->dev->stats.tx_bytes += skb->len; |
1521 | vif->dev->stats.tx_packets++; | |
0c12295a | 1522 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1523 | goto out_free; |
1da177e4 LT |
1524 | } |
1525 | #endif | |
1526 | ||
1527 | if (vif->flags&VIFF_TUNNEL) { | |
1528 | struct flowi fl = { .oif = vif->link, | |
1529 | .nl_u = { .ip4_u = | |
1530 | { .daddr = vif->remote, | |
1531 | .saddr = vif->local, | |
1532 | .tos = RT_TOS(iph->tos) } }, | |
1533 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1534 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1535 | goto out_free; |
1536 | encap = sizeof(struct iphdr); | |
1537 | } else { | |
1538 | struct flowi fl = { .oif = vif->link, | |
1539 | .nl_u = { .ip4_u = | |
1540 | { .daddr = iph->daddr, | |
1541 | .tos = RT_TOS(iph->tos) } }, | |
1542 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1543 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1544 | goto out_free; |
1545 | } | |
1546 | ||
1547 | dev = rt->u.dst.dev; | |
1548 | ||
1549 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1550 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1551 | allow to send ICMP, so that packets will disappear | |
1552 | to blackhole. | |
1553 | */ | |
1554 | ||
7c73a6fa | 1555 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1556 | ip_rt_put(rt); |
1557 | goto out_free; | |
1558 | } | |
1559 | ||
1560 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1561 | ||
1562 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1563 | ip_rt_put(rt); |
1da177e4 LT |
1564 | goto out_free; |
1565 | } | |
1566 | ||
1567 | vif->pkt_out++; | |
c354e124 | 1568 | vif->bytes_out += skb->len; |
1da177e4 | 1569 | |
adf30907 ED |
1570 | skb_dst_drop(skb); |
1571 | skb_dst_set(skb, &rt->u.dst); | |
eddc9ec5 | 1572 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1573 | |
1574 | /* FIXME: forward and output firewalls used to be called here. | |
1575 | * What do we do with netfilter? -- RR */ | |
1576 | if (vif->flags & VIFF_TUNNEL) { | |
1577 | ip_encap(skb, vif->local, vif->remote); | |
1578 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1579 | vif->dev->stats.tx_packets++; |
1580 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1581 | } |
1582 | ||
1583 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1584 | ||
1585 | /* | |
1586 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1587 | * not only before forwarding, but after forwarding on all output | |
1588 | * interfaces. It is clear, if mrouter runs a multicasting | |
1589 | * program, it should receive packets not depending to what interface | |
1590 | * program is joined. | |
1591 | * If we will not make it, the program will have to join on all | |
1592 | * interfaces. On the other hand, multihoming host (or router, but | |
1593 | * not mrouter) cannot join to more than one interface - it will | |
1594 | * result in receiving multiple packets. | |
1595 | */ | |
6e23ae2a | 1596 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1597 | ipmr_forward_finish); |
1598 | return; | |
1599 | ||
1600 | out_free: | |
1601 | kfree_skb(skb); | |
1602 | return; | |
1603 | } | |
1604 | ||
0c12295a | 1605 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1606 | { |
1607 | int ct; | |
0c12295a PM |
1608 | |
1609 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1610 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1611 | break; |
1612 | } | |
1613 | return ct; | |
1614 | } | |
1615 | ||
1616 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1617 | ||
0c12295a PM |
1618 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
1619 | struct sk_buff *skb, struct mfc_cache *cache, | |
1620 | int local) | |
1da177e4 LT |
1621 | { |
1622 | int psend = -1; | |
1623 | int vif, ct; | |
1624 | ||
1625 | vif = cache->mfc_parent; | |
1626 | cache->mfc_un.res.pkt++; | |
1627 | cache->mfc_un.res.bytes += skb->len; | |
1628 | ||
1629 | /* | |
1630 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1631 | */ | |
0c12295a | 1632 | if (mrt->vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1633 | int true_vifi; |
1634 | ||
511c3f92 | 1635 | if (skb_rtable(skb)->fl.iif == 0) { |
1da177e4 LT |
1636 | /* It is our own packet, looped back. |
1637 | Very complicated situation... | |
1638 | ||
1639 | The best workaround until routing daemons will be | |
1640 | fixed is not to redistribute packet, if it was | |
1641 | send through wrong interface. It means, that | |
1642 | multicast applications WILL NOT work for | |
1643 | (S,G), which have default multicast route pointing | |
1644 | to wrong oif. In any case, it is not a good | |
1645 | idea to use multicasting applications on router. | |
1646 | */ | |
1647 | goto dont_forward; | |
1648 | } | |
1649 | ||
1650 | cache->mfc_un.res.wrong_if++; | |
0c12295a | 1651 | true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1652 | |
0c12295a | 1653 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 LT |
1654 | /* pimsm uses asserts, when switching from RPT to SPT, |
1655 | so that we cannot check that packet arrived on an oif. | |
1656 | It is bad, but otherwise we would need to move pretty | |
1657 | large chunk of pimd to kernel. Ough... --ANK | |
1658 | */ | |
0c12295a | 1659 | (mrt->mroute_do_pim || |
6f9374a9 | 1660 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1661 | time_after(jiffies, |
1da177e4 LT |
1662 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1663 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1664 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1665 | } |
1666 | goto dont_forward; | |
1667 | } | |
1668 | ||
0c12295a PM |
1669 | mrt->vif_table[vif].pkt_in++; |
1670 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1671 | |
1672 | /* | |
1673 | * Forward the frame | |
1674 | */ | |
1675 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1676 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1677 | if (psend != -1) { |
1678 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1679 | if (skb2) | |
0c12295a PM |
1680 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1681 | psend); | |
1da177e4 | 1682 | } |
c354e124 | 1683 | psend = ct; |
1da177e4 LT |
1684 | } |
1685 | } | |
1686 | if (psend != -1) { | |
1687 | if (local) { | |
1688 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1689 | if (skb2) | |
0c12295a | 1690 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1691 | } else { |
0c12295a | 1692 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
1da177e4 LT |
1693 | return 0; |
1694 | } | |
1695 | } | |
1696 | ||
1697 | dont_forward: | |
1698 | if (!local) | |
1699 | kfree_skb(skb); | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | ||
1704 | /* | |
1705 | * Multicast packets for forwarding arrive here | |
1706 | */ | |
1707 | ||
1708 | int ip_mr_input(struct sk_buff *skb) | |
1709 | { | |
1710 | struct mfc_cache *cache; | |
4feb88e5 | 1711 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1712 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 PM |
1713 | struct mr_table *mrt; |
1714 | int err; | |
1da177e4 LT |
1715 | |
1716 | /* Packet is looped back after forward, it should not be | |
1717 | forwarded second time, but still can be delivered locally. | |
1718 | */ | |
1719 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1720 | goto dont_forward; | |
1721 | ||
f0ad0860 PM |
1722 | err = ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt); |
1723 | if (err < 0) | |
1724 | return err; | |
1725 | ||
1da177e4 LT |
1726 | if (!local) { |
1727 | if (IPCB(skb)->opt.router_alert) { | |
1728 | if (ip_call_ra_chain(skb)) | |
1729 | return 0; | |
eddc9ec5 | 1730 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1731 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1732 | Cisco IOS <= 11.2(8)) do not put router alert | |
1733 | option to IGMP packets destined to routable | |
1734 | groups. It is very bad, because it means | |
1735 | that we can forward NO IGMP messages. | |
1736 | */ | |
1737 | read_lock(&mrt_lock); | |
0c12295a | 1738 | if (mrt->mroute_sk) { |
2715bcf9 | 1739 | nf_reset(skb); |
0c12295a | 1740 | raw_rcv(mrt->mroute_sk, skb); |
1da177e4 LT |
1741 | read_unlock(&mrt_lock); |
1742 | return 0; | |
1743 | } | |
1744 | read_unlock(&mrt_lock); | |
1745 | } | |
1746 | } | |
1747 | ||
1748 | read_lock(&mrt_lock); | |
0c12295a | 1749 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1750 | |
1751 | /* | |
1752 | * No usable cache entry | |
1753 | */ | |
c354e124 | 1754 | if (cache == NULL) { |
1da177e4 LT |
1755 | int vif; |
1756 | ||
1757 | if (local) { | |
1758 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1759 | ip_local_deliver(skb); | |
1760 | if (skb2 == NULL) { | |
1761 | read_unlock(&mrt_lock); | |
1762 | return -ENOBUFS; | |
1763 | } | |
1764 | skb = skb2; | |
1765 | } | |
1766 | ||
0c12295a | 1767 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1768 | if (vif >= 0) { |
0c12295a | 1769 | int err = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
1770 | read_unlock(&mrt_lock); |
1771 | ||
1772 | return err; | |
1773 | } | |
1774 | read_unlock(&mrt_lock); | |
1775 | kfree_skb(skb); | |
1776 | return -ENODEV; | |
1777 | } | |
1778 | ||
0c12295a | 1779 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
1780 | |
1781 | read_unlock(&mrt_lock); | |
1782 | ||
1783 | if (local) | |
1784 | return ip_local_deliver(skb); | |
1785 | ||
1786 | return 0; | |
1787 | ||
1788 | dont_forward: | |
1789 | if (local) | |
1790 | return ip_local_deliver(skb); | |
1791 | kfree_skb(skb); | |
1792 | return 0; | |
1793 | } | |
1794 | ||
b1879204 | 1795 | #ifdef CONFIG_IP_PIMSM |
f0ad0860 PM |
1796 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
1797 | unsigned int pimlen) | |
1da177e4 | 1798 | { |
b1879204 IJ |
1799 | struct net_device *reg_dev = NULL; |
1800 | struct iphdr *encap; | |
1da177e4 | 1801 | |
b1879204 | 1802 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1803 | /* |
1804 | Check that: | |
1805 | a. packet is really destinted to a multicast group | |
1806 | b. packet is not a NULL-REGISTER | |
1807 | c. packet is not truncated | |
1808 | */ | |
f97c1e0c | 1809 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1810 | encap->tot_len == 0 || |
b1879204 IJ |
1811 | ntohs(encap->tot_len) + pimlen > skb->len) |
1812 | return 1; | |
1da177e4 LT |
1813 | |
1814 | read_lock(&mrt_lock); | |
0c12295a PM |
1815 | if (mrt->mroute_reg_vif_num >= 0) |
1816 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
1817 | if (reg_dev) |
1818 | dev_hold(reg_dev); | |
1819 | read_unlock(&mrt_lock); | |
1820 | ||
e905a9ed | 1821 | if (reg_dev == NULL) |
b1879204 | 1822 | return 1; |
1da177e4 | 1823 | |
b0e380b1 | 1824 | skb->mac_header = skb->network_header; |
1da177e4 | 1825 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1826 | skb_reset_network_header(skb); |
1da177e4 | 1827 | skb->dev = reg_dev; |
1da177e4 LT |
1828 | skb->protocol = htons(ETH_P_IP); |
1829 | skb->ip_summed = 0; | |
1830 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 1831 | skb_dst_drop(skb); |
cf3677ae PE |
1832 | reg_dev->stats.rx_bytes += skb->len; |
1833 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1834 | nf_reset(skb); |
1835 | netif_rx(skb); | |
1836 | dev_put(reg_dev); | |
b1879204 | 1837 | |
1da177e4 | 1838 | return 0; |
b1879204 IJ |
1839 | } |
1840 | #endif | |
1841 | ||
1842 | #ifdef CONFIG_IP_PIMSM_V1 | |
1843 | /* | |
1844 | * Handle IGMP messages of PIMv1 | |
1845 | */ | |
1846 | ||
1847 | int pim_rcv_v1(struct sk_buff * skb) | |
1848 | { | |
1849 | struct igmphdr *pim; | |
4feb88e5 | 1850 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 1851 | struct mr_table *mrt; |
b1879204 IJ |
1852 | |
1853 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1854 | goto drop; | |
1855 | ||
1856 | pim = igmp_hdr(skb); | |
1857 | ||
f0ad0860 PM |
1858 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1859 | goto drop; | |
1860 | ||
0c12295a | 1861 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
1862 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1863 | goto drop; | |
1864 | ||
f0ad0860 | 1865 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
1866 | drop: |
1867 | kfree_skb(skb); | |
1868 | } | |
1da177e4 LT |
1869 | return 0; |
1870 | } | |
1871 | #endif | |
1872 | ||
1873 | #ifdef CONFIG_IP_PIMSM_V2 | |
1874 | static int pim_rcv(struct sk_buff * skb) | |
1875 | { | |
1876 | struct pimreghdr *pim; | |
f0ad0860 PM |
1877 | struct net *net = dev_net(skb->dev); |
1878 | struct mr_table *mrt; | |
1da177e4 | 1879 | |
b1879204 | 1880 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1881 | goto drop; |
1882 | ||
9c70220b | 1883 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1884 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1885 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1886 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1887 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1888 | goto drop; |
1889 | ||
f0ad0860 PM |
1890 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1891 | goto drop; | |
1892 | ||
1893 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { | |
b1879204 IJ |
1894 | drop: |
1895 | kfree_skb(skb); | |
1896 | } | |
1da177e4 LT |
1897 | return 0; |
1898 | } | |
1899 | #endif | |
1900 | ||
1901 | static int | |
0c12295a | 1902 | ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, struct mfc_cache *c, |
d658f8a0 | 1903 | struct rtmsg *rtm) |
1da177e4 LT |
1904 | { |
1905 | int ct; | |
1906 | struct rtnexthop *nhp; | |
27a884dc | 1907 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1908 | struct rtattr *mp_head; |
1909 | ||
7438189b ND |
1910 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1911 | if (c->mfc_parent > MAXVIFS) | |
1912 | return -ENOENT; | |
1913 | ||
0c12295a PM |
1914 | if (VIF_EXISTS(mrt, c->mfc_parent)) |
1915 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex); | |
1da177e4 | 1916 | |
c354e124 | 1917 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1918 | |
1919 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 1920 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
1da177e4 LT |
1921 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1922 | goto rtattr_failure; | |
c354e124 | 1923 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1924 | nhp->rtnh_flags = 0; |
1925 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 1926 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
1927 | nhp->rtnh_len = sizeof(*nhp); |
1928 | } | |
1929 | } | |
1930 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1931 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1932 | rtm->rtm_type = RTN_MULTICAST; |
1933 | return 1; | |
1934 | ||
1935 | rtattr_failure: | |
dc5fc579 | 1936 | nlmsg_trim(skb, b); |
1da177e4 LT |
1937 | return -EMSGSIZE; |
1938 | } | |
1939 | ||
4feb88e5 BT |
1940 | int ipmr_get_route(struct net *net, |
1941 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1da177e4 LT |
1942 | { |
1943 | int err; | |
f0ad0860 | 1944 | struct mr_table *mrt; |
1da177e4 | 1945 | struct mfc_cache *cache; |
511c3f92 | 1946 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 1947 | |
f0ad0860 PM |
1948 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
1949 | if (mrt == NULL) | |
1950 | return -ENOENT; | |
1951 | ||
1da177e4 | 1952 | read_lock(&mrt_lock); |
0c12295a | 1953 | cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst); |
1da177e4 | 1954 | |
c354e124 | 1955 | if (cache == NULL) { |
72287490 | 1956 | struct sk_buff *skb2; |
eddc9ec5 | 1957 | struct iphdr *iph; |
1da177e4 LT |
1958 | struct net_device *dev; |
1959 | int vif; | |
1960 | ||
1961 | if (nowait) { | |
1962 | read_unlock(&mrt_lock); | |
1963 | return -EAGAIN; | |
1964 | } | |
1965 | ||
1966 | dev = skb->dev; | |
0c12295a | 1967 | if (dev == NULL || (vif = ipmr_find_vif(mrt, dev)) < 0) { |
1da177e4 LT |
1968 | read_unlock(&mrt_lock); |
1969 | return -ENODEV; | |
1970 | } | |
72287490 AK |
1971 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1972 | if (!skb2) { | |
1973 | read_unlock(&mrt_lock); | |
1974 | return -ENOMEM; | |
1975 | } | |
1976 | ||
e2d1bca7 ACM |
1977 | skb_push(skb2, sizeof(struct iphdr)); |
1978 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1979 | iph = ip_hdr(skb2); |
1980 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1981 | iph->saddr = rt->rt_src; | |
1982 | iph->daddr = rt->rt_dst; | |
1983 | iph->version = 0; | |
0c12295a | 1984 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 LT |
1985 | read_unlock(&mrt_lock); |
1986 | return err; | |
1987 | } | |
1988 | ||
1989 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1990 | cache->mfc_flags |= MFC_NOTIFY; | |
0c12295a | 1991 | err = ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 LT |
1992 | read_unlock(&mrt_lock); |
1993 | return err; | |
1994 | } | |
1995 | ||
e905a9ed | 1996 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
1997 | /* |
1998 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
1999 | */ | |
2000 | struct ipmr_vif_iter { | |
f6bb4514 | 2001 | struct seq_net_private p; |
f0ad0860 | 2002 | struct mr_table *mrt; |
1da177e4 LT |
2003 | int ct; |
2004 | }; | |
2005 | ||
f6bb4514 BT |
2006 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2007 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2008 | loff_t pos) |
2009 | { | |
f0ad0860 | 2010 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2011 | |
2012 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2013 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2014 | continue; |
e905a9ed | 2015 | if (pos-- == 0) |
0c12295a | 2016 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2017 | } |
2018 | return NULL; | |
2019 | } | |
2020 | ||
2021 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2022 | __acquires(mrt_lock) |
1da177e4 | 2023 | { |
f0ad0860 | 2024 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2025 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2026 | struct mr_table *mrt; |
2027 | ||
2028 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2029 | if (mrt == NULL) | |
2030 | return ERR_PTR(-ENOENT); | |
2031 | ||
2032 | iter->mrt = mrt; | |
f6bb4514 | 2033 | |
1da177e4 | 2034 | read_lock(&mrt_lock); |
f6bb4514 | 2035 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2036 | : SEQ_START_TOKEN; |
2037 | } | |
2038 | ||
2039 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2040 | { | |
2041 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2042 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2043 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2044 | |
2045 | ++*pos; | |
2046 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2047 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2048 | |
0c12295a PM |
2049 | while (++iter->ct < mrt->maxvif) { |
2050 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2051 | continue; |
0c12295a | 2052 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2053 | } |
2054 | return NULL; | |
2055 | } | |
2056 | ||
2057 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2058 | __releases(mrt_lock) |
1da177e4 LT |
2059 | { |
2060 | read_unlock(&mrt_lock); | |
2061 | } | |
2062 | ||
2063 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2064 | { | |
f0ad0860 PM |
2065 | struct ipmr_vif_iter *iter = seq->private; |
2066 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2067 | |
1da177e4 | 2068 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2069 | seq_puts(seq, |
1da177e4 LT |
2070 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2071 | } else { | |
2072 | const struct vif_device *vif = v; | |
2073 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2074 | ||
2075 | seq_printf(seq, | |
2076 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2077 | vif - mrt->vif_table, |
e905a9ed | 2078 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2079 | vif->bytes_out, vif->pkt_out, |
2080 | vif->flags, vif->local, vif->remote); | |
2081 | } | |
2082 | return 0; | |
2083 | } | |
2084 | ||
f690808e | 2085 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2086 | .start = ipmr_vif_seq_start, |
2087 | .next = ipmr_vif_seq_next, | |
2088 | .stop = ipmr_vif_seq_stop, | |
2089 | .show = ipmr_vif_seq_show, | |
2090 | }; | |
2091 | ||
2092 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2093 | { | |
f6bb4514 BT |
2094 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2095 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2096 | } |
2097 | ||
9a32144e | 2098 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2099 | .owner = THIS_MODULE, |
2100 | .open = ipmr_vif_open, | |
2101 | .read = seq_read, | |
2102 | .llseek = seq_lseek, | |
f6bb4514 | 2103 | .release = seq_release_net, |
1da177e4 LT |
2104 | }; |
2105 | ||
2106 | struct ipmr_mfc_iter { | |
f6bb4514 | 2107 | struct seq_net_private p; |
f0ad0860 | 2108 | struct mr_table *mrt; |
862465f2 | 2109 | struct list_head *cache; |
1da177e4 LT |
2110 | int ct; |
2111 | }; | |
2112 | ||
2113 | ||
f6bb4514 BT |
2114 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2115 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2116 | { |
f0ad0860 | 2117 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2118 | struct mfc_cache *mfc; |
2119 | ||
1da177e4 | 2120 | read_lock(&mrt_lock); |
862465f2 | 2121 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2122 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 | 2123 | list_for_each_entry(mfc, it->cache, list) |
e905a9ed | 2124 | if (pos-- == 0) |
1da177e4 | 2125 | return mfc; |
862465f2 | 2126 | } |
1da177e4 LT |
2127 | read_unlock(&mrt_lock); |
2128 | ||
1da177e4 | 2129 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2130 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2131 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2132 | if (pos-- == 0) |
1da177e4 LT |
2133 | return mfc; |
2134 | spin_unlock_bh(&mfc_unres_lock); | |
2135 | ||
2136 | it->cache = NULL; | |
2137 | return NULL; | |
2138 | } | |
2139 | ||
2140 | ||
2141 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2142 | { | |
2143 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2144 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2145 | struct mr_table *mrt; |
2146 | ||
2147 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2148 | if (mrt == NULL) | |
2149 | return ERR_PTR(-ENOENT); | |
f6bb4514 | 2150 | |
f0ad0860 | 2151 | it->mrt = mrt; |
1da177e4 LT |
2152 | it->cache = NULL; |
2153 | it->ct = 0; | |
f6bb4514 | 2154 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2155 | : SEQ_START_TOKEN; |
2156 | } | |
2157 | ||
2158 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2159 | { | |
2160 | struct mfc_cache *mfc = v; | |
2161 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2162 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2163 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2164 | |
2165 | ++*pos; | |
2166 | ||
2167 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2168 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2169 | |
862465f2 PM |
2170 | if (mfc->list.next != it->cache) |
2171 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2172 | |
0c12295a | 2173 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2174 | goto end_of_list; |
2175 | ||
0c12295a | 2176 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2177 | |
2178 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2179 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2180 | if (list_empty(it->cache)) |
2181 | continue; | |
2182 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2183 | } |
2184 | ||
2185 | /* exhausted cache_array, show unresolved */ | |
2186 | read_unlock(&mrt_lock); | |
0c12295a | 2187 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2188 | it->ct = 0; |
e905a9ed | 2189 | |
1da177e4 | 2190 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2191 | if (!list_empty(it->cache)) |
2192 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2193 | |
2194 | end_of_list: | |
2195 | spin_unlock_bh(&mfc_unres_lock); | |
2196 | it->cache = NULL; | |
2197 | ||
2198 | return NULL; | |
2199 | } | |
2200 | ||
2201 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2202 | { | |
2203 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2204 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2205 | |
0c12295a | 2206 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2207 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2208 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
1da177e4 LT |
2209 | read_unlock(&mrt_lock); |
2210 | } | |
2211 | ||
2212 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2213 | { | |
2214 | int n; | |
2215 | ||
2216 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2217 | seq_puts(seq, |
1da177e4 LT |
2218 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2219 | } else { | |
2220 | const struct mfc_cache *mfc = v; | |
2221 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2222 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2223 | |
999890b2 | 2224 | seq_printf(seq, "%08lX %08lX %-3hd", |
1da177e4 LT |
2225 | (unsigned long) mfc->mfc_mcastgrp, |
2226 | (unsigned long) mfc->mfc_origin, | |
1ea472e2 | 2227 | mfc->mfc_parent); |
1da177e4 | 2228 | |
0c12295a | 2229 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2230 | seq_printf(seq, " %8lu %8lu %8lu", |
2231 | mfc->mfc_un.res.pkt, | |
2232 | mfc->mfc_un.res.bytes, | |
2233 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
2234 | for (n = mfc->mfc_un.res.minvif; |
2235 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
0c12295a | 2236 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2237 | mfc->mfc_un.res.ttls[n] < 255) |
2238 | seq_printf(seq, | |
e905a9ed | 2239 | " %2d:%-3d", |
1da177e4 LT |
2240 | n, mfc->mfc_un.res.ttls[n]); |
2241 | } | |
1ea472e2 BT |
2242 | } else { |
2243 | /* unresolved mfc_caches don't contain | |
2244 | * pkt, bytes and wrong_if values | |
2245 | */ | |
2246 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2247 | } |
2248 | seq_putc(seq, '\n'); | |
2249 | } | |
2250 | return 0; | |
2251 | } | |
2252 | ||
f690808e | 2253 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2254 | .start = ipmr_mfc_seq_start, |
2255 | .next = ipmr_mfc_seq_next, | |
2256 | .stop = ipmr_mfc_seq_stop, | |
2257 | .show = ipmr_mfc_seq_show, | |
2258 | }; | |
2259 | ||
2260 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2261 | { | |
f6bb4514 BT |
2262 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2263 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2264 | } |
2265 | ||
9a32144e | 2266 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2267 | .owner = THIS_MODULE, |
2268 | .open = ipmr_mfc_open, | |
2269 | .read = seq_read, | |
2270 | .llseek = seq_lseek, | |
f6bb4514 | 2271 | .release = seq_release_net, |
1da177e4 | 2272 | }; |
e905a9ed | 2273 | #endif |
1da177e4 LT |
2274 | |
2275 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2276 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2277 | .handler = pim_rcv, |
403dbb97 | 2278 | .netns_ok = 1, |
1da177e4 LT |
2279 | }; |
2280 | #endif | |
2281 | ||
2282 | ||
2283 | /* | |
2284 | * Setup for IP multicast routing | |
2285 | */ | |
cf958ae3 BT |
2286 | static int __net_init ipmr_net_init(struct net *net) |
2287 | { | |
f0ad0860 | 2288 | int err; |
cf958ae3 | 2289 | |
f0ad0860 PM |
2290 | err = ipmr_rules_init(net); |
2291 | if (err < 0) | |
cf958ae3 | 2292 | goto fail; |
f6bb4514 BT |
2293 | |
2294 | #ifdef CONFIG_PROC_FS | |
2295 | err = -ENOMEM; | |
2296 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
2297 | goto proc_vif_fail; | |
2298 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
2299 | goto proc_cache_fail; | |
2300 | #endif | |
2bb8b26c BT |
2301 | return 0; |
2302 | ||
f6bb4514 BT |
2303 | #ifdef CONFIG_PROC_FS |
2304 | proc_cache_fail: | |
2305 | proc_net_remove(net, "ip_mr_vif"); | |
2306 | proc_vif_fail: | |
f0ad0860 | 2307 | ipmr_rules_exit(net); |
f6bb4514 | 2308 | #endif |
cf958ae3 BT |
2309 | fail: |
2310 | return err; | |
2311 | } | |
2312 | ||
2313 | static void __net_exit ipmr_net_exit(struct net *net) | |
2314 | { | |
f6bb4514 BT |
2315 | #ifdef CONFIG_PROC_FS |
2316 | proc_net_remove(net, "ip_mr_cache"); | |
2317 | proc_net_remove(net, "ip_mr_vif"); | |
2318 | #endif | |
f0ad0860 | 2319 | ipmr_rules_exit(net); |
cf958ae3 BT |
2320 | } |
2321 | ||
2322 | static struct pernet_operations ipmr_net_ops = { | |
2323 | .init = ipmr_net_init, | |
2324 | .exit = ipmr_net_exit, | |
2325 | }; | |
e905a9ed | 2326 | |
03d2f897 | 2327 | int __init ip_mr_init(void) |
1da177e4 | 2328 | { |
03d2f897 WC |
2329 | int err; |
2330 | ||
1da177e4 LT |
2331 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2332 | sizeof(struct mfc_cache), | |
e5d679f3 | 2333 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2334 | NULL); |
03d2f897 WC |
2335 | if (!mrt_cachep) |
2336 | return -ENOMEM; | |
2337 | ||
cf958ae3 BT |
2338 | err = register_pernet_subsys(&ipmr_net_ops); |
2339 | if (err) | |
2340 | goto reg_pernet_fail; | |
2341 | ||
03d2f897 WC |
2342 | err = register_netdevice_notifier(&ip_mr_notifier); |
2343 | if (err) | |
2344 | goto reg_notif_fail; | |
403dbb97 TG |
2345 | #ifdef CONFIG_IP_PIMSM_V2 |
2346 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
2347 | printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); | |
2348 | err = -EAGAIN; | |
2349 | goto add_proto_fail; | |
2350 | } | |
2351 | #endif | |
03d2f897 | 2352 | return 0; |
f6bb4514 | 2353 | |
403dbb97 TG |
2354 | #ifdef CONFIG_IP_PIMSM_V2 |
2355 | add_proto_fail: | |
2356 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2357 | #endif | |
c3e38896 | 2358 | reg_notif_fail: |
cf958ae3 BT |
2359 | unregister_pernet_subsys(&ipmr_net_ops); |
2360 | reg_pernet_fail: | |
c3e38896 | 2361 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2362 | return err; |
1da177e4 | 2363 | } |