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1 | /* | |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> | |
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 | * | |
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 requirement to work with older peers. | |
26 | * | |
27 | */ | |
28 | ||
29 | #include <asm/system.h> | |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/types.h> | |
32 | #include <linux/capability.h> | |
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> | |
49 | #include <linux/if_ether.h> | |
50 | #include <linux/slab.h> | |
51 | #include <net/net_namespace.h> | |
52 | #include <net/ip.h> | |
53 | #include <net/protocol.h> | |
54 | #include <linux/skbuff.h> | |
55 | #include <net/route.h> | |
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 <linux/compat.h> | |
64 | #include <linux/export.h> | |
65 | #include <net/ipip.h> | |
66 | #include <net/checksum.h> | |
67 | #include <net/netlink.h> | |
68 | #include <net/fib_rules.h> | |
69 | ||
70 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
71 | #define CONFIG_IP_PIMSM 1 | |
72 | #endif | |
73 | ||
74 | struct mr_table { | |
75 | struct list_head list; | |
76 | #ifdef CONFIG_NET_NS | |
77 | struct net *net; | |
78 | #endif | |
79 | u32 id; | |
80 | struct sock __rcu *mroute_sk; | |
81 | struct timer_list ipmr_expire_timer; | |
82 | struct list_head mfc_unres_queue; | |
83 | struct list_head mfc_cache_array[MFC_LINES]; | |
84 | struct vif_device vif_table[MAXVIFS]; | |
85 | int maxvif; | |
86 | atomic_t cache_resolve_queue_len; | |
87 | int mroute_do_assert; | |
88 | int mroute_do_pim; | |
89 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
90 | int mroute_reg_vif_num; | |
91 | #endif | |
92 | }; | |
93 | ||
94 | struct ipmr_rule { | |
95 | struct fib_rule common; | |
96 | }; | |
97 | ||
98 | struct ipmr_result { | |
99 | struct mr_table *mrt; | |
100 | }; | |
101 | ||
102 | /* Big lock, protecting vif table, mrt cache and mroute socket state. | |
103 | * Note that the changes are semaphored via rtnl_lock. | |
104 | */ | |
105 | ||
106 | static DEFINE_RWLOCK(mrt_lock); | |
107 | ||
108 | /* | |
109 | * Multicast router control variables | |
110 | */ | |
111 | ||
112 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) | |
113 | ||
114 | /* Special spinlock for queue of unresolved entries */ | |
115 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
116 | ||
117 | /* We return to original Alan's scheme. Hash table of resolved | |
118 | * entries is changed only in process context and protected | |
119 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
120 | * with strong spinlock mfc_unres_lock. | |
121 | * | |
122 | * In this case data path is free of exclusive locks at all. | |
123 | */ | |
124 | ||
125 | static struct kmem_cache *mrt_cachep __read_mostly; | |
126 | ||
127 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); | |
128 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, | |
129 | struct sk_buff *skb, struct mfc_cache *cache, | |
130 | int local); | |
131 | static int ipmr_cache_report(struct mr_table *mrt, | |
132 | struct sk_buff *pkt, vifi_t vifi, int assert); | |
133 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, | |
134 | struct mfc_cache *c, struct rtmsg *rtm); | |
135 | static void ipmr_expire_process(unsigned long arg); | |
136 | ||
137 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
138 | #define ipmr_for_each_table(mrt, net) \ | |
139 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
140 | ||
141 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
142 | { | |
143 | struct mr_table *mrt; | |
144 | ||
145 | ipmr_for_each_table(mrt, net) { | |
146 | if (mrt->id == id) | |
147 | return mrt; | |
148 | } | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, | |
153 | struct mr_table **mrt) | |
154 | { | |
155 | struct ipmr_result res; | |
156 | struct fib_lookup_arg arg = { .result = &res, }; | |
157 | int err; | |
158 | ||
159 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, | |
160 | flowi4_to_flowi(flp4), 0, &arg); | |
161 | if (err < 0) | |
162 | return err; | |
163 | *mrt = res.mrt; | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
168 | int flags, struct fib_lookup_arg *arg) | |
169 | { | |
170 | struct ipmr_result *res = arg->result; | |
171 | struct mr_table *mrt; | |
172 | ||
173 | switch (rule->action) { | |
174 | case FR_ACT_TO_TBL: | |
175 | break; | |
176 | case FR_ACT_UNREACHABLE: | |
177 | return -ENETUNREACH; | |
178 | case FR_ACT_PROHIBIT: | |
179 | return -EACCES; | |
180 | case FR_ACT_BLACKHOLE: | |
181 | default: | |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
186 | if (mrt == NULL) | |
187 | return -EAGAIN; | |
188 | res->mrt = mrt; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
193 | { | |
194 | return 1; | |
195 | } | |
196 | ||
197 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
198 | FRA_GENERIC_POLICY, | |
199 | }; | |
200 | ||
201 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
202 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
203 | { | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
208 | struct nlattr **tb) | |
209 | { | |
210 | return 1; | |
211 | } | |
212 | ||
213 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
214 | struct fib_rule_hdr *frh) | |
215 | { | |
216 | frh->dst_len = 0; | |
217 | frh->src_len = 0; | |
218 | frh->tos = 0; | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static const struct fib_rules_ops __net_initdata ipmr_rules_ops_template = { | |
223 | .family = RTNL_FAMILY_IPMR, | |
224 | .rule_size = sizeof(struct ipmr_rule), | |
225 | .addr_size = sizeof(u32), | |
226 | .action = ipmr_rule_action, | |
227 | .match = ipmr_rule_match, | |
228 | .configure = ipmr_rule_configure, | |
229 | .compare = ipmr_rule_compare, | |
230 | .default_pref = fib_default_rule_pref, | |
231 | .fill = ipmr_rule_fill, | |
232 | .nlgroup = RTNLGRP_IPV4_RULE, | |
233 | .policy = ipmr_rule_policy, | |
234 | .owner = THIS_MODULE, | |
235 | }; | |
236 | ||
237 | static int __net_init ipmr_rules_init(struct net *net) | |
238 | { | |
239 | struct fib_rules_ops *ops; | |
240 | struct mr_table *mrt; | |
241 | int err; | |
242 | ||
243 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
244 | if (IS_ERR(ops)) | |
245 | return PTR_ERR(ops); | |
246 | ||
247 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
248 | ||
249 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
250 | if (mrt == NULL) { | |
251 | err = -ENOMEM; | |
252 | goto err1; | |
253 | } | |
254 | ||
255 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
256 | if (err < 0) | |
257 | goto err2; | |
258 | ||
259 | net->ipv4.mr_rules_ops = ops; | |
260 | return 0; | |
261 | ||
262 | err2: | |
263 | kfree(mrt); | |
264 | err1: | |
265 | fib_rules_unregister(ops); | |
266 | return err; | |
267 | } | |
268 | ||
269 | static void __net_exit ipmr_rules_exit(struct net *net) | |
270 | { | |
271 | struct mr_table *mrt, *next; | |
272 | ||
273 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { | |
274 | list_del(&mrt->list); | |
275 | kfree(mrt); | |
276 | } | |
277 | fib_rules_unregister(net->ipv4.mr_rules_ops); | |
278 | } | |
279 | #else | |
280 | #define ipmr_for_each_table(mrt, net) \ | |
281 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
282 | ||
283 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
284 | { | |
285 | return net->ipv4.mrt; | |
286 | } | |
287 | ||
288 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, | |
289 | struct mr_table **mrt) | |
290 | { | |
291 | *mrt = net->ipv4.mrt; | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int __net_init ipmr_rules_init(struct net *net) | |
296 | { | |
297 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
298 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
299 | } | |
300 | ||
301 | static void __net_exit ipmr_rules_exit(struct net *net) | |
302 | { | |
303 | kfree(net->ipv4.mrt); | |
304 | } | |
305 | #endif | |
306 | ||
307 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
308 | { | |
309 | struct mr_table *mrt; | |
310 | unsigned int i; | |
311 | ||
312 | mrt = ipmr_get_table(net, id); | |
313 | if (mrt != NULL) | |
314 | return mrt; | |
315 | ||
316 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
317 | if (mrt == NULL) | |
318 | return NULL; | |
319 | write_pnet(&mrt->net, net); | |
320 | mrt->id = id; | |
321 | ||
322 | /* Forwarding cache */ | |
323 | for (i = 0; i < MFC_LINES; i++) | |
324 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
325 | ||
326 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
327 | ||
328 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
329 | (unsigned long)mrt); | |
330 | ||
331 | #ifdef CONFIG_IP_PIMSM | |
332 | mrt->mroute_reg_vif_num = -1; | |
333 | #endif | |
334 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
335 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
336 | #endif | |
337 | return mrt; | |
338 | } | |
339 | ||
340 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ | |
341 | ||
342 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) | |
343 | { | |
344 | struct net *net = dev_net(dev); | |
345 | ||
346 | dev_close(dev); | |
347 | ||
348 | dev = __dev_get_by_name(net, "tunl0"); | |
349 | if (dev) { | |
350 | const struct net_device_ops *ops = dev->netdev_ops; | |
351 | struct ifreq ifr; | |
352 | struct ip_tunnel_parm p; | |
353 | ||
354 | memset(&p, 0, sizeof(p)); | |
355 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
356 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
357 | p.iph.version = 4; | |
358 | p.iph.ihl = 5; | |
359 | p.iph.protocol = IPPROTO_IPIP; | |
360 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
361 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
362 | ||
363 | if (ops->ndo_do_ioctl) { | |
364 | mm_segment_t oldfs = get_fs(); | |
365 | ||
366 | set_fs(KERNEL_DS); | |
367 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
368 | set_fs(oldfs); | |
369 | } | |
370 | } | |
371 | } | |
372 | ||
373 | static | |
374 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) | |
375 | { | |
376 | struct net_device *dev; | |
377 | ||
378 | dev = __dev_get_by_name(net, "tunl0"); | |
379 | ||
380 | if (dev) { | |
381 | const struct net_device_ops *ops = dev->netdev_ops; | |
382 | int err; | |
383 | struct ifreq ifr; | |
384 | struct ip_tunnel_parm p; | |
385 | struct in_device *in_dev; | |
386 | ||
387 | memset(&p, 0, sizeof(p)); | |
388 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
389 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
390 | p.iph.version = 4; | |
391 | p.iph.ihl = 5; | |
392 | p.iph.protocol = IPPROTO_IPIP; | |
393 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
394 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
395 | ||
396 | if (ops->ndo_do_ioctl) { | |
397 | mm_segment_t oldfs = get_fs(); | |
398 | ||
399 | set_fs(KERNEL_DS); | |
400 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
401 | set_fs(oldfs); | |
402 | } else { | |
403 | err = -EOPNOTSUPP; | |
404 | } | |
405 | dev = NULL; | |
406 | ||
407 | if (err == 0 && | |
408 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
409 | dev->flags |= IFF_MULTICAST; | |
410 | ||
411 | in_dev = __in_dev_get_rtnl(dev); | |
412 | if (in_dev == NULL) | |
413 | goto failure; | |
414 | ||
415 | ipv4_devconf_setall(in_dev); | |
416 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
417 | ||
418 | if (dev_open(dev)) | |
419 | goto failure; | |
420 | dev_hold(dev); | |
421 | } | |
422 | } | |
423 | return dev; | |
424 | ||
425 | failure: | |
426 | /* allow the register to be completed before unregistering. */ | |
427 | rtnl_unlock(); | |
428 | rtnl_lock(); | |
429 | ||
430 | unregister_netdevice(dev); | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | #ifdef CONFIG_IP_PIMSM | |
435 | ||
436 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
437 | { | |
438 | struct net *net = dev_net(dev); | |
439 | struct mr_table *mrt; | |
440 | struct flowi4 fl4 = { | |
441 | .flowi4_oif = dev->ifindex, | |
442 | .flowi4_iif = skb->skb_iif, | |
443 | .flowi4_mark = skb->mark, | |
444 | }; | |
445 | int err; | |
446 | ||
447 | err = ipmr_fib_lookup(net, &fl4, &mrt); | |
448 | if (err < 0) { | |
449 | kfree_skb(skb); | |
450 | return err; | |
451 | } | |
452 | ||
453 | read_lock(&mrt_lock); | |
454 | dev->stats.tx_bytes += skb->len; | |
455 | dev->stats.tx_packets++; | |
456 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); | |
457 | read_unlock(&mrt_lock); | |
458 | kfree_skb(skb); | |
459 | return NETDEV_TX_OK; | |
460 | } | |
461 | ||
462 | static const struct net_device_ops reg_vif_netdev_ops = { | |
463 | .ndo_start_xmit = reg_vif_xmit, | |
464 | }; | |
465 | ||
466 | static void reg_vif_setup(struct net_device *dev) | |
467 | { | |
468 | dev->type = ARPHRD_PIMREG; | |
469 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; | |
470 | dev->flags = IFF_NOARP; | |
471 | dev->netdev_ops = ®_vif_netdev_ops, | |
472 | dev->destructor = free_netdev; | |
473 | dev->features |= NETIF_F_NETNS_LOCAL; | |
474 | } | |
475 | ||
476 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) | |
477 | { | |
478 | struct net_device *dev; | |
479 | struct in_device *in_dev; | |
480 | char name[IFNAMSIZ]; | |
481 | ||
482 | if (mrt->id == RT_TABLE_DEFAULT) | |
483 | sprintf(name, "pimreg"); | |
484 | else | |
485 | sprintf(name, "pimreg%u", mrt->id); | |
486 | ||
487 | dev = alloc_netdev(0, name, reg_vif_setup); | |
488 | ||
489 | if (dev == NULL) | |
490 | return NULL; | |
491 | ||
492 | dev_net_set(dev, net); | |
493 | ||
494 | if (register_netdevice(dev)) { | |
495 | free_netdev(dev); | |
496 | return NULL; | |
497 | } | |
498 | dev->iflink = 0; | |
499 | ||
500 | rcu_read_lock(); | |
501 | in_dev = __in_dev_get_rcu(dev); | |
502 | if (!in_dev) { | |
503 | rcu_read_unlock(); | |
504 | goto failure; | |
505 | } | |
506 | ||
507 | ipv4_devconf_setall(in_dev); | |
508 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
509 | rcu_read_unlock(); | |
510 | ||
511 | if (dev_open(dev)) | |
512 | goto failure; | |
513 | ||
514 | dev_hold(dev); | |
515 | ||
516 | return dev; | |
517 | ||
518 | failure: | |
519 | /* allow the register to be completed before unregistering. */ | |
520 | rtnl_unlock(); | |
521 | rtnl_lock(); | |
522 | ||
523 | unregister_netdevice(dev); | |
524 | return NULL; | |
525 | } | |
526 | #endif | |
527 | ||
528 | /* | |
529 | * Delete a VIF entry | |
530 | * @notify: Set to 1, if the caller is a notifier_call | |
531 | */ | |
532 | ||
533 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, | |
534 | struct list_head *head) | |
535 | { | |
536 | struct vif_device *v; | |
537 | struct net_device *dev; | |
538 | struct in_device *in_dev; | |
539 | ||
540 | if (vifi < 0 || vifi >= mrt->maxvif) | |
541 | return -EADDRNOTAVAIL; | |
542 | ||
543 | v = &mrt->vif_table[vifi]; | |
544 | ||
545 | write_lock_bh(&mrt_lock); | |
546 | dev = v->dev; | |
547 | v->dev = NULL; | |
548 | ||
549 | if (!dev) { | |
550 | write_unlock_bh(&mrt_lock); | |
551 | return -EADDRNOTAVAIL; | |
552 | } | |
553 | ||
554 | #ifdef CONFIG_IP_PIMSM | |
555 | if (vifi == mrt->mroute_reg_vif_num) | |
556 | mrt->mroute_reg_vif_num = -1; | |
557 | #endif | |
558 | ||
559 | if (vifi + 1 == mrt->maxvif) { | |
560 | int tmp; | |
561 | ||
562 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
563 | if (VIF_EXISTS(mrt, tmp)) | |
564 | break; | |
565 | } | |
566 | mrt->maxvif = tmp+1; | |
567 | } | |
568 | ||
569 | write_unlock_bh(&mrt_lock); | |
570 | ||
571 | dev_set_allmulti(dev, -1); | |
572 | ||
573 | in_dev = __in_dev_get_rtnl(dev); | |
574 | if (in_dev) { | |
575 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; | |
576 | ip_rt_multicast_event(in_dev); | |
577 | } | |
578 | ||
579 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) | |
580 | unregister_netdevice_queue(dev, head); | |
581 | ||
582 | dev_put(dev); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | static void ipmr_cache_free_rcu(struct rcu_head *head) | |
587 | { | |
588 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); | |
589 | ||
590 | kmem_cache_free(mrt_cachep, c); | |
591 | } | |
592 | ||
593 | static inline void ipmr_cache_free(struct mfc_cache *c) | |
594 | { | |
595 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
596 | } | |
597 | ||
598 | /* Destroy an unresolved cache entry, killing queued skbs | |
599 | * and reporting error to netlink readers. | |
600 | */ | |
601 | ||
602 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) | |
603 | { | |
604 | struct net *net = read_pnet(&mrt->net); | |
605 | struct sk_buff *skb; | |
606 | struct nlmsgerr *e; | |
607 | ||
608 | atomic_dec(&mrt->cache_resolve_queue_len); | |
609 | ||
610 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { | |
611 | if (ip_hdr(skb)->version == 0) { | |
612 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); | |
613 | nlh->nlmsg_type = NLMSG_ERROR; | |
614 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
615 | skb_trim(skb, nlh->nlmsg_len); | |
616 | e = NLMSG_DATA(nlh); | |
617 | e->error = -ETIMEDOUT; | |
618 | memset(&e->msg, 0, sizeof(e->msg)); | |
619 | ||
620 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); | |
621 | } else { | |
622 | kfree_skb(skb); | |
623 | } | |
624 | } | |
625 | ||
626 | ipmr_cache_free(c); | |
627 | } | |
628 | ||
629 | ||
630 | /* Timer process for the unresolved queue. */ | |
631 | ||
632 | static void ipmr_expire_process(unsigned long arg) | |
633 | { | |
634 | struct mr_table *mrt = (struct mr_table *)arg; | |
635 | unsigned long now; | |
636 | unsigned long expires; | |
637 | struct mfc_cache *c, *next; | |
638 | ||
639 | if (!spin_trylock(&mfc_unres_lock)) { | |
640 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); | |
641 | return; | |
642 | } | |
643 | ||
644 | if (list_empty(&mrt->mfc_unres_queue)) | |
645 | goto out; | |
646 | ||
647 | now = jiffies; | |
648 | expires = 10*HZ; | |
649 | ||
650 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { | |
651 | if (time_after(c->mfc_un.unres.expires, now)) { | |
652 | unsigned long interval = c->mfc_un.unres.expires - now; | |
653 | if (interval < expires) | |
654 | expires = interval; | |
655 | continue; | |
656 | } | |
657 | ||
658 | list_del(&c->list); | |
659 | ipmr_destroy_unres(mrt, c); | |
660 | } | |
661 | ||
662 | if (!list_empty(&mrt->mfc_unres_queue)) | |
663 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
664 | ||
665 | out: | |
666 | spin_unlock(&mfc_unres_lock); | |
667 | } | |
668 | ||
669 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
670 | ||
671 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, | |
672 | unsigned char *ttls) | |
673 | { | |
674 | int vifi; | |
675 | ||
676 | cache->mfc_un.res.minvif = MAXVIFS; | |
677 | cache->mfc_un.res.maxvif = 0; | |
678 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
679 | ||
680 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { | |
681 | if (VIF_EXISTS(mrt, vifi) && | |
682 | ttls[vifi] && ttls[vifi] < 255) { | |
683 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
684 | if (cache->mfc_un.res.minvif > vifi) | |
685 | cache->mfc_un.res.minvif = vifi; | |
686 | if (cache->mfc_un.res.maxvif <= vifi) | |
687 | cache->mfc_un.res.maxvif = vifi + 1; | |
688 | } | |
689 | } | |
690 | } | |
691 | ||
692 | static int vif_add(struct net *net, struct mr_table *mrt, | |
693 | struct vifctl *vifc, int mrtsock) | |
694 | { | |
695 | int vifi = vifc->vifc_vifi; | |
696 | struct vif_device *v = &mrt->vif_table[vifi]; | |
697 | struct net_device *dev; | |
698 | struct in_device *in_dev; | |
699 | int err; | |
700 | ||
701 | /* Is vif busy ? */ | |
702 | if (VIF_EXISTS(mrt, vifi)) | |
703 | return -EADDRINUSE; | |
704 | ||
705 | switch (vifc->vifc_flags) { | |
706 | #ifdef CONFIG_IP_PIMSM | |
707 | case VIFF_REGISTER: | |
708 | /* | |
709 | * Special Purpose VIF in PIM | |
710 | * All the packets will be sent to the daemon | |
711 | */ | |
712 | if (mrt->mroute_reg_vif_num >= 0) | |
713 | return -EADDRINUSE; | |
714 | dev = ipmr_reg_vif(net, mrt); | |
715 | if (!dev) | |
716 | return -ENOBUFS; | |
717 | err = dev_set_allmulti(dev, 1); | |
718 | if (err) { | |
719 | unregister_netdevice(dev); | |
720 | dev_put(dev); | |
721 | return err; | |
722 | } | |
723 | break; | |
724 | #endif | |
725 | case VIFF_TUNNEL: | |
726 | dev = ipmr_new_tunnel(net, vifc); | |
727 | if (!dev) | |
728 | return -ENOBUFS; | |
729 | err = dev_set_allmulti(dev, 1); | |
730 | if (err) { | |
731 | ipmr_del_tunnel(dev, vifc); | |
732 | dev_put(dev); | |
733 | return err; | |
734 | } | |
735 | break; | |
736 | ||
737 | case VIFF_USE_IFINDEX: | |
738 | case 0: | |
739 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { | |
740 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
741 | if (dev && __in_dev_get_rtnl(dev) == NULL) { | |
742 | dev_put(dev); | |
743 | return -EADDRNOTAVAIL; | |
744 | } | |
745 | } else { | |
746 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); | |
747 | } | |
748 | if (!dev) | |
749 | return -EADDRNOTAVAIL; | |
750 | err = dev_set_allmulti(dev, 1); | |
751 | if (err) { | |
752 | dev_put(dev); | |
753 | return err; | |
754 | } | |
755 | break; | |
756 | default: | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
760 | in_dev = __in_dev_get_rtnl(dev); | |
761 | if (!in_dev) { | |
762 | dev_put(dev); | |
763 | return -EADDRNOTAVAIL; | |
764 | } | |
765 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; | |
766 | ip_rt_multicast_event(in_dev); | |
767 | ||
768 | /* Fill in the VIF structures */ | |
769 | ||
770 | v->rate_limit = vifc->vifc_rate_limit; | |
771 | v->local = vifc->vifc_lcl_addr.s_addr; | |
772 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
773 | v->flags = vifc->vifc_flags; | |
774 | if (!mrtsock) | |
775 | v->flags |= VIFF_STATIC; | |
776 | v->threshold = vifc->vifc_threshold; | |
777 | v->bytes_in = 0; | |
778 | v->bytes_out = 0; | |
779 | v->pkt_in = 0; | |
780 | v->pkt_out = 0; | |
781 | v->link = dev->ifindex; | |
782 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) | |
783 | v->link = dev->iflink; | |
784 | ||
785 | /* And finish update writing critical data */ | |
786 | write_lock_bh(&mrt_lock); | |
787 | v->dev = dev; | |
788 | #ifdef CONFIG_IP_PIMSM | |
789 | if (v->flags & VIFF_REGISTER) | |
790 | mrt->mroute_reg_vif_num = vifi; | |
791 | #endif | |
792 | if (vifi+1 > mrt->maxvif) | |
793 | mrt->maxvif = vifi+1; | |
794 | write_unlock_bh(&mrt_lock); | |
795 | return 0; | |
796 | } | |
797 | ||
798 | /* called with rcu_read_lock() */ | |
799 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, | |
800 | __be32 origin, | |
801 | __be32 mcastgrp) | |
802 | { | |
803 | int line = MFC_HASH(mcastgrp, origin); | |
804 | struct mfc_cache *c; | |
805 | ||
806 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { | |
807 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) | |
808 | return c; | |
809 | } | |
810 | return NULL; | |
811 | } | |
812 | ||
813 | /* | |
814 | * Allocate a multicast cache entry | |
815 | */ | |
816 | static struct mfc_cache *ipmr_cache_alloc(void) | |
817 | { | |
818 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); | |
819 | ||
820 | if (c) | |
821 | c->mfc_un.res.minvif = MAXVIFS; | |
822 | return c; | |
823 | } | |
824 | ||
825 | static struct mfc_cache *ipmr_cache_alloc_unres(void) | |
826 | { | |
827 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); | |
828 | ||
829 | if (c) { | |
830 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
831 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
832 | } | |
833 | return c; | |
834 | } | |
835 | ||
836 | /* | |
837 | * A cache entry has gone into a resolved state from queued | |
838 | */ | |
839 | ||
840 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, | |
841 | struct mfc_cache *uc, struct mfc_cache *c) | |
842 | { | |
843 | struct sk_buff *skb; | |
844 | struct nlmsgerr *e; | |
845 | ||
846 | /* Play the pending entries through our router */ | |
847 | ||
848 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
849 | if (ip_hdr(skb)->version == 0) { | |
850 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); | |
851 | ||
852 | if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { | |
853 | nlh->nlmsg_len = skb_tail_pointer(skb) - | |
854 | (u8 *)nlh; | |
855 | } else { | |
856 | nlh->nlmsg_type = NLMSG_ERROR; | |
857 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
858 | skb_trim(skb, nlh->nlmsg_len); | |
859 | e = NLMSG_DATA(nlh); | |
860 | e->error = -EMSGSIZE; | |
861 | memset(&e->msg, 0, sizeof(e->msg)); | |
862 | } | |
863 | ||
864 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); | |
865 | } else { | |
866 | ip_mr_forward(net, mrt, skb, c, 0); | |
867 | } | |
868 | } | |
869 | } | |
870 | ||
871 | /* | |
872 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
873 | * expects the following bizarre scheme. | |
874 | * | |
875 | * Called under mrt_lock. | |
876 | */ | |
877 | ||
878 | static int ipmr_cache_report(struct mr_table *mrt, | |
879 | struct sk_buff *pkt, vifi_t vifi, int assert) | |
880 | { | |
881 | struct sk_buff *skb; | |
882 | const int ihl = ip_hdrlen(pkt); | |
883 | struct igmphdr *igmp; | |
884 | struct igmpmsg *msg; | |
885 | struct sock *mroute_sk; | |
886 | int ret; | |
887 | ||
888 | #ifdef CONFIG_IP_PIMSM | |
889 | if (assert == IGMPMSG_WHOLEPKT) | |
890 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
891 | else | |
892 | #endif | |
893 | skb = alloc_skb(128, GFP_ATOMIC); | |
894 | ||
895 | if (!skb) | |
896 | return -ENOBUFS; | |
897 | ||
898 | #ifdef CONFIG_IP_PIMSM | |
899 | if (assert == IGMPMSG_WHOLEPKT) { | |
900 | /* Ugly, but we have no choice with this interface. | |
901 | * Duplicate old header, fix ihl, length etc. | |
902 | * And all this only to mangle msg->im_msgtype and | |
903 | * to set msg->im_mbz to "mbz" :-) | |
904 | */ | |
905 | skb_push(skb, sizeof(struct iphdr)); | |
906 | skb_reset_network_header(skb); | |
907 | skb_reset_transport_header(skb); | |
908 | msg = (struct igmpmsg *)skb_network_header(skb); | |
909 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); | |
910 | msg->im_msgtype = IGMPMSG_WHOLEPKT; | |
911 | msg->im_mbz = 0; | |
912 | msg->im_vif = mrt->mroute_reg_vif_num; | |
913 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; | |
914 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
915 | sizeof(struct iphdr)); | |
916 | } else | |
917 | #endif | |
918 | { | |
919 | ||
920 | /* Copy the IP header */ | |
921 | ||
922 | skb->network_header = skb->tail; | |
923 | skb_put(skb, ihl); | |
924 | skb_copy_to_linear_data(skb, pkt->data, ihl); | |
925 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ | |
926 | msg = (struct igmpmsg *)skb_network_header(skb); | |
927 | msg->im_vif = vifi; | |
928 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); | |
929 | ||
930 | /* Add our header */ | |
931 | ||
932 | igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
933 | igmp->type = | |
934 | msg->im_msgtype = assert; | |
935 | igmp->code = 0; | |
936 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
937 | skb->transport_header = skb->network_header; | |
938 | } | |
939 | ||
940 | rcu_read_lock(); | |
941 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
942 | if (mroute_sk == NULL) { | |
943 | rcu_read_unlock(); | |
944 | kfree_skb(skb); | |
945 | return -EINVAL; | |
946 | } | |
947 | ||
948 | /* Deliver to mrouted */ | |
949 | ||
950 | ret = sock_queue_rcv_skb(mroute_sk, skb); | |
951 | rcu_read_unlock(); | |
952 | if (ret < 0) { | |
953 | if (net_ratelimit()) | |
954 | pr_warn("mroute: pending queue full, dropping entries\n"); | |
955 | kfree_skb(skb); | |
956 | } | |
957 | ||
958 | return ret; | |
959 | } | |
960 | ||
961 | /* | |
962 | * Queue a packet for resolution. It gets locked cache entry! | |
963 | */ | |
964 | ||
965 | static int | |
966 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) | |
967 | { | |
968 | bool found = false; | |
969 | int err; | |
970 | struct mfc_cache *c; | |
971 | const struct iphdr *iph = ip_hdr(skb); | |
972 | ||
973 | spin_lock_bh(&mfc_unres_lock); | |
974 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { | |
975 | if (c->mfc_mcastgrp == iph->daddr && | |
976 | c->mfc_origin == iph->saddr) { | |
977 | found = true; | |
978 | break; | |
979 | } | |
980 | } | |
981 | ||
982 | if (!found) { | |
983 | /* Create a new entry if allowable */ | |
984 | ||
985 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || | |
986 | (c = ipmr_cache_alloc_unres()) == NULL) { | |
987 | spin_unlock_bh(&mfc_unres_lock); | |
988 | ||
989 | kfree_skb(skb); | |
990 | return -ENOBUFS; | |
991 | } | |
992 | ||
993 | /* Fill in the new cache entry */ | |
994 | ||
995 | c->mfc_parent = -1; | |
996 | c->mfc_origin = iph->saddr; | |
997 | c->mfc_mcastgrp = iph->daddr; | |
998 | ||
999 | /* Reflect first query at mrouted. */ | |
1000 | ||
1001 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); | |
1002 | if (err < 0) { | |
1003 | /* If the report failed throw the cache entry | |
1004 | out - Brad Parker | |
1005 | */ | |
1006 | spin_unlock_bh(&mfc_unres_lock); | |
1007 | ||
1008 | ipmr_cache_free(c); | |
1009 | kfree_skb(skb); | |
1010 | return err; | |
1011 | } | |
1012 | ||
1013 | atomic_inc(&mrt->cache_resolve_queue_len); | |
1014 | list_add(&c->list, &mrt->mfc_unres_queue); | |
1015 | ||
1016 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) | |
1017 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1018 | } | |
1019 | ||
1020 | /* See if we can append the packet */ | |
1021 | ||
1022 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1023 | kfree_skb(skb); | |
1024 | err = -ENOBUFS; | |
1025 | } else { | |
1026 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
1027 | err = 0; | |
1028 | } | |
1029 | ||
1030 | spin_unlock_bh(&mfc_unres_lock); | |
1031 | return err; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * MFC cache manipulation by user space mroute daemon | |
1036 | */ | |
1037 | ||
1038 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc) | |
1039 | { | |
1040 | int line; | |
1041 | struct mfc_cache *c, *next; | |
1042 | ||
1043 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
1044 | ||
1045 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { | |
1046 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
1047 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
1048 | list_del_rcu(&c->list); | |
1049 | ||
1050 | ipmr_cache_free(c); | |
1051 | return 0; | |
1052 | } | |
1053 | } | |
1054 | return -ENOENT; | |
1055 | } | |
1056 | ||
1057 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, | |
1058 | struct mfcctl *mfc, int mrtsock) | |
1059 | { | |
1060 | bool found = false; | |
1061 | int line; | |
1062 | struct mfc_cache *uc, *c; | |
1063 | ||
1064 | if (mfc->mfcc_parent >= MAXVIFS) | |
1065 | return -ENFILE; | |
1066 | ||
1067 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); | |
1068 | ||
1069 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { | |
1070 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && | |
1071 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
1072 | found = true; | |
1073 | break; | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | if (found) { | |
1078 | write_lock_bh(&mrt_lock); | |
1079 | c->mfc_parent = mfc->mfcc_parent; | |
1080 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); | |
1081 | if (!mrtsock) | |
1082 | c->mfc_flags |= MFC_STATIC; | |
1083 | write_unlock_bh(&mrt_lock); | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) | |
1088 | return -EINVAL; | |
1089 | ||
1090 | c = ipmr_cache_alloc(); | |
1091 | if (c == NULL) | |
1092 | return -ENOMEM; | |
1093 | ||
1094 | c->mfc_origin = mfc->mfcc_origin.s_addr; | |
1095 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1096 | c->mfc_parent = mfc->mfcc_parent; | |
1097 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); | |
1098 | if (!mrtsock) | |
1099 | c->mfc_flags |= MFC_STATIC; | |
1100 | ||
1101 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); | |
1102 | ||
1103 | /* | |
1104 | * Check to see if we resolved a queued list. If so we | |
1105 | * need to send on the frames and tidy up. | |
1106 | */ | |
1107 | found = false; | |
1108 | spin_lock_bh(&mfc_unres_lock); | |
1109 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { | |
1110 | if (uc->mfc_origin == c->mfc_origin && | |
1111 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { | |
1112 | list_del(&uc->list); | |
1113 | atomic_dec(&mrt->cache_resolve_queue_len); | |
1114 | found = true; | |
1115 | break; | |
1116 | } | |
1117 | } | |
1118 | if (list_empty(&mrt->mfc_unres_queue)) | |
1119 | del_timer(&mrt->ipmr_expire_timer); | |
1120 | spin_unlock_bh(&mfc_unres_lock); | |
1121 | ||
1122 | if (found) { | |
1123 | ipmr_cache_resolve(net, mrt, uc, c); | |
1124 | ipmr_cache_free(uc); | |
1125 | } | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * Close the multicast socket, and clear the vif tables etc | |
1131 | */ | |
1132 | ||
1133 | static void mroute_clean_tables(struct mr_table *mrt) | |
1134 | { | |
1135 | int i; | |
1136 | LIST_HEAD(list); | |
1137 | struct mfc_cache *c, *next; | |
1138 | ||
1139 | /* Shut down all active vif entries */ | |
1140 | ||
1141 | for (i = 0; i < mrt->maxvif; i++) { | |
1142 | if (!(mrt->vif_table[i].flags & VIFF_STATIC)) | |
1143 | vif_delete(mrt, i, 0, &list); | |
1144 | } | |
1145 | unregister_netdevice_many(&list); | |
1146 | ||
1147 | /* Wipe the cache */ | |
1148 | ||
1149 | for (i = 0; i < MFC_LINES; i++) { | |
1150 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { | |
1151 | if (c->mfc_flags & MFC_STATIC) | |
1152 | continue; | |
1153 | list_del_rcu(&c->list); | |
1154 | ipmr_cache_free(c); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { | |
1159 | spin_lock_bh(&mfc_unres_lock); | |
1160 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { | |
1161 | list_del(&c->list); | |
1162 | ipmr_destroy_unres(mrt, c); | |
1163 | } | |
1164 | spin_unlock_bh(&mfc_unres_lock); | |
1165 | } | |
1166 | } | |
1167 | ||
1168 | /* called from ip_ra_control(), before an RCU grace period, | |
1169 | * we dont need to call synchronize_rcu() here | |
1170 | */ | |
1171 | static void mrtsock_destruct(struct sock *sk) | |
1172 | { | |
1173 | struct net *net = sock_net(sk); | |
1174 | struct mr_table *mrt; | |
1175 | ||
1176 | rtnl_lock(); | |
1177 | ipmr_for_each_table(mrt, net) { | |
1178 | if (sk == rtnl_dereference(mrt->mroute_sk)) { | |
1179 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; | |
1180 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); | |
1181 | mroute_clean_tables(mrt); | |
1182 | } | |
1183 | } | |
1184 | rtnl_unlock(); | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Socket options and virtual interface manipulation. The whole | |
1189 | * virtual interface system is a complete heap, but unfortunately | |
1190 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1191 | * MOSPF/PIM router set up we can clean this up. | |
1192 | */ | |
1193 | ||
1194 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) | |
1195 | { | |
1196 | int ret; | |
1197 | struct vifctl vif; | |
1198 | struct mfcctl mfc; | |
1199 | struct net *net = sock_net(sk); | |
1200 | struct mr_table *mrt; | |
1201 | ||
1202 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1203 | if (mrt == NULL) | |
1204 | return -ENOENT; | |
1205 | ||
1206 | if (optname != MRT_INIT) { | |
1207 | if (sk != rcu_access_pointer(mrt->mroute_sk) && | |
1208 | !capable(CAP_NET_ADMIN)) | |
1209 | return -EACCES; | |
1210 | } | |
1211 | ||
1212 | switch (optname) { | |
1213 | case MRT_INIT: | |
1214 | if (sk->sk_type != SOCK_RAW || | |
1215 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1216 | return -EOPNOTSUPP; | |
1217 | if (optlen != sizeof(int)) | |
1218 | return -ENOPROTOOPT; | |
1219 | ||
1220 | rtnl_lock(); | |
1221 | if (rtnl_dereference(mrt->mroute_sk)) { | |
1222 | rtnl_unlock(); | |
1223 | return -EADDRINUSE; | |
1224 | } | |
1225 | ||
1226 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1227 | if (ret == 0) { | |
1228 | rcu_assign_pointer(mrt->mroute_sk, sk); | |
1229 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; | |
1230 | } | |
1231 | rtnl_unlock(); | |
1232 | return ret; | |
1233 | case MRT_DONE: | |
1234 | if (sk != rcu_access_pointer(mrt->mroute_sk)) | |
1235 | return -EACCES; | |
1236 | return ip_ra_control(sk, 0, NULL); | |
1237 | case MRT_ADD_VIF: | |
1238 | case MRT_DEL_VIF: | |
1239 | if (optlen != sizeof(vif)) | |
1240 | return -EINVAL; | |
1241 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1242 | return -EFAULT; | |
1243 | if (vif.vifc_vifi >= MAXVIFS) | |
1244 | return -ENFILE; | |
1245 | rtnl_lock(); | |
1246 | if (optname == MRT_ADD_VIF) { | |
1247 | ret = vif_add(net, mrt, &vif, | |
1248 | sk == rtnl_dereference(mrt->mroute_sk)); | |
1249 | } else { | |
1250 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); | |
1251 | } | |
1252 | rtnl_unlock(); | |
1253 | return ret; | |
1254 | ||
1255 | /* | |
1256 | * Manipulate the forwarding caches. These live | |
1257 | * in a sort of kernel/user symbiosis. | |
1258 | */ | |
1259 | case MRT_ADD_MFC: | |
1260 | case MRT_DEL_MFC: | |
1261 | if (optlen != sizeof(mfc)) | |
1262 | return -EINVAL; | |
1263 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1264 | return -EFAULT; | |
1265 | rtnl_lock(); | |
1266 | if (optname == MRT_DEL_MFC) | |
1267 | ret = ipmr_mfc_delete(mrt, &mfc); | |
1268 | else | |
1269 | ret = ipmr_mfc_add(net, mrt, &mfc, | |
1270 | sk == rtnl_dereference(mrt->mroute_sk)); | |
1271 | rtnl_unlock(); | |
1272 | return ret; | |
1273 | /* | |
1274 | * Control PIM assert. | |
1275 | */ | |
1276 | case MRT_ASSERT: | |
1277 | { | |
1278 | int v; | |
1279 | if (get_user(v, (int __user *)optval)) | |
1280 | return -EFAULT; | |
1281 | mrt->mroute_do_assert = (v) ? 1 : 0; | |
1282 | return 0; | |
1283 | } | |
1284 | #ifdef CONFIG_IP_PIMSM | |
1285 | case MRT_PIM: | |
1286 | { | |
1287 | int v; | |
1288 | ||
1289 | if (get_user(v, (int __user *)optval)) | |
1290 | return -EFAULT; | |
1291 | v = (v) ? 1 : 0; | |
1292 | ||
1293 | rtnl_lock(); | |
1294 | ret = 0; | |
1295 | if (v != mrt->mroute_do_pim) { | |
1296 | mrt->mroute_do_pim = v; | |
1297 | mrt->mroute_do_assert = v; | |
1298 | } | |
1299 | rtnl_unlock(); | |
1300 | return ret; | |
1301 | } | |
1302 | #endif | |
1303 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1304 | case MRT_TABLE: | |
1305 | { | |
1306 | u32 v; | |
1307 | ||
1308 | if (optlen != sizeof(u32)) | |
1309 | return -EINVAL; | |
1310 | if (get_user(v, (u32 __user *)optval)) | |
1311 | return -EFAULT; | |
1312 | ||
1313 | rtnl_lock(); | |
1314 | ret = 0; | |
1315 | if (sk == rtnl_dereference(mrt->mroute_sk)) { | |
1316 | ret = -EBUSY; | |
1317 | } else { | |
1318 | if (!ipmr_new_table(net, v)) | |
1319 | ret = -ENOMEM; | |
1320 | raw_sk(sk)->ipmr_table = v; | |
1321 | } | |
1322 | rtnl_unlock(); | |
1323 | return ret; | |
1324 | } | |
1325 | #endif | |
1326 | /* | |
1327 | * Spurious command, or MRT_VERSION which you cannot | |
1328 | * set. | |
1329 | */ | |
1330 | default: | |
1331 | return -ENOPROTOOPT; | |
1332 | } | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Getsock opt support for the multicast routing system. | |
1337 | */ | |
1338 | ||
1339 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) | |
1340 | { | |
1341 | int olr; | |
1342 | int val; | |
1343 | struct net *net = sock_net(sk); | |
1344 | struct mr_table *mrt; | |
1345 | ||
1346 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1347 | if (mrt == NULL) | |
1348 | return -ENOENT; | |
1349 | ||
1350 | if (optname != MRT_VERSION && | |
1351 | #ifdef CONFIG_IP_PIMSM | |
1352 | optname != MRT_PIM && | |
1353 | #endif | |
1354 | optname != MRT_ASSERT) | |
1355 | return -ENOPROTOOPT; | |
1356 | ||
1357 | if (get_user(olr, optlen)) | |
1358 | return -EFAULT; | |
1359 | ||
1360 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1361 | if (olr < 0) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | if (put_user(olr, optlen)) | |
1365 | return -EFAULT; | |
1366 | if (optname == MRT_VERSION) | |
1367 | val = 0x0305; | |
1368 | #ifdef CONFIG_IP_PIMSM | |
1369 | else if (optname == MRT_PIM) | |
1370 | val = mrt->mroute_do_pim; | |
1371 | #endif | |
1372 | else | |
1373 | val = mrt->mroute_do_assert; | |
1374 | if (copy_to_user(optval, &val, olr)) | |
1375 | return -EFAULT; | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * The IP multicast ioctl support routines. | |
1381 | */ | |
1382 | ||
1383 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1384 | { | |
1385 | struct sioc_sg_req sr; | |
1386 | struct sioc_vif_req vr; | |
1387 | struct vif_device *vif; | |
1388 | struct mfc_cache *c; | |
1389 | struct net *net = sock_net(sk); | |
1390 | struct mr_table *mrt; | |
1391 | ||
1392 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1393 | if (mrt == NULL) | |
1394 | return -ENOENT; | |
1395 | ||
1396 | switch (cmd) { | |
1397 | case SIOCGETVIFCNT: | |
1398 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1399 | return -EFAULT; | |
1400 | if (vr.vifi >= mrt->maxvif) | |
1401 | return -EINVAL; | |
1402 | read_lock(&mrt_lock); | |
1403 | vif = &mrt->vif_table[vr.vifi]; | |
1404 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1405 | vr.icount = vif->pkt_in; | |
1406 | vr.ocount = vif->pkt_out; | |
1407 | vr.ibytes = vif->bytes_in; | |
1408 | vr.obytes = vif->bytes_out; | |
1409 | read_unlock(&mrt_lock); | |
1410 | ||
1411 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1412 | return -EFAULT; | |
1413 | return 0; | |
1414 | } | |
1415 | read_unlock(&mrt_lock); | |
1416 | return -EADDRNOTAVAIL; | |
1417 | case SIOCGETSGCNT: | |
1418 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1419 | return -EFAULT; | |
1420 | ||
1421 | rcu_read_lock(); | |
1422 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1423 | if (c) { | |
1424 | sr.pktcnt = c->mfc_un.res.pkt; | |
1425 | sr.bytecnt = c->mfc_un.res.bytes; | |
1426 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1427 | rcu_read_unlock(); | |
1428 | ||
1429 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1430 | return -EFAULT; | |
1431 | return 0; | |
1432 | } | |
1433 | rcu_read_unlock(); | |
1434 | return -EADDRNOTAVAIL; | |
1435 | default: | |
1436 | return -ENOIOCTLCMD; | |
1437 | } | |
1438 | } | |
1439 | ||
1440 | #ifdef CONFIG_COMPAT | |
1441 | struct compat_sioc_sg_req { | |
1442 | struct in_addr src; | |
1443 | struct in_addr grp; | |
1444 | compat_ulong_t pktcnt; | |
1445 | compat_ulong_t bytecnt; | |
1446 | compat_ulong_t wrong_if; | |
1447 | }; | |
1448 | ||
1449 | struct compat_sioc_vif_req { | |
1450 | vifi_t vifi; /* Which iface */ | |
1451 | compat_ulong_t icount; | |
1452 | compat_ulong_t ocount; | |
1453 | compat_ulong_t ibytes; | |
1454 | compat_ulong_t obytes; | |
1455 | }; | |
1456 | ||
1457 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) | |
1458 | { | |
1459 | struct compat_sioc_sg_req sr; | |
1460 | struct compat_sioc_vif_req vr; | |
1461 | struct vif_device *vif; | |
1462 | struct mfc_cache *c; | |
1463 | struct net *net = sock_net(sk); | |
1464 | struct mr_table *mrt; | |
1465 | ||
1466 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1467 | if (mrt == NULL) | |
1468 | return -ENOENT; | |
1469 | ||
1470 | switch (cmd) { | |
1471 | case SIOCGETVIFCNT: | |
1472 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1473 | return -EFAULT; | |
1474 | if (vr.vifi >= mrt->maxvif) | |
1475 | return -EINVAL; | |
1476 | read_lock(&mrt_lock); | |
1477 | vif = &mrt->vif_table[vr.vifi]; | |
1478 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1479 | vr.icount = vif->pkt_in; | |
1480 | vr.ocount = vif->pkt_out; | |
1481 | vr.ibytes = vif->bytes_in; | |
1482 | vr.obytes = vif->bytes_out; | |
1483 | read_unlock(&mrt_lock); | |
1484 | ||
1485 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1486 | return -EFAULT; | |
1487 | return 0; | |
1488 | } | |
1489 | read_unlock(&mrt_lock); | |
1490 | return -EADDRNOTAVAIL; | |
1491 | case SIOCGETSGCNT: | |
1492 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1493 | return -EFAULT; | |
1494 | ||
1495 | rcu_read_lock(); | |
1496 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1497 | if (c) { | |
1498 | sr.pktcnt = c->mfc_un.res.pkt; | |
1499 | sr.bytecnt = c->mfc_un.res.bytes; | |
1500 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1501 | rcu_read_unlock(); | |
1502 | ||
1503 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1504 | return -EFAULT; | |
1505 | return 0; | |
1506 | } | |
1507 | rcu_read_unlock(); | |
1508 | return -EADDRNOTAVAIL; | |
1509 | default: | |
1510 | return -ENOIOCTLCMD; | |
1511 | } | |
1512 | } | |
1513 | #endif | |
1514 | ||
1515 | ||
1516 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1517 | { | |
1518 | struct net_device *dev = ptr; | |
1519 | struct net *net = dev_net(dev); | |
1520 | struct mr_table *mrt; | |
1521 | struct vif_device *v; | |
1522 | int ct; | |
1523 | ||
1524 | if (event != NETDEV_UNREGISTER) | |
1525 | return NOTIFY_DONE; | |
1526 | ||
1527 | ipmr_for_each_table(mrt, net) { | |
1528 | v = &mrt->vif_table[0]; | |
1529 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1530 | if (v->dev == dev) | |
1531 | vif_delete(mrt, ct, 1, NULL); | |
1532 | } | |
1533 | } | |
1534 | return NOTIFY_DONE; | |
1535 | } | |
1536 | ||
1537 | ||
1538 | static struct notifier_block ip_mr_notifier = { | |
1539 | .notifier_call = ipmr_device_event, | |
1540 | }; | |
1541 | ||
1542 | /* | |
1543 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1544 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1545 | * important for multicast video. | |
1546 | */ | |
1547 | ||
1548 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) | |
1549 | { | |
1550 | struct iphdr *iph; | |
1551 | const struct iphdr *old_iph = ip_hdr(skb); | |
1552 | ||
1553 | skb_push(skb, sizeof(struct iphdr)); | |
1554 | skb->transport_header = skb->network_header; | |
1555 | skb_reset_network_header(skb); | |
1556 | iph = ip_hdr(skb); | |
1557 | ||
1558 | iph->version = 4; | |
1559 | iph->tos = old_iph->tos; | |
1560 | iph->ttl = old_iph->ttl; | |
1561 | iph->frag_off = 0; | |
1562 | iph->daddr = daddr; | |
1563 | iph->saddr = saddr; | |
1564 | iph->protocol = IPPROTO_IPIP; | |
1565 | iph->ihl = 5; | |
1566 | iph->tot_len = htons(skb->len); | |
1567 | ip_select_ident(iph, skb_dst(skb), NULL); | |
1568 | ip_send_check(iph); | |
1569 | ||
1570 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); | |
1571 | nf_reset(skb); | |
1572 | } | |
1573 | ||
1574 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1575 | { | |
1576 | struct ip_options *opt = &(IPCB(skb)->opt); | |
1577 | ||
1578 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); | |
1579 | ||
1580 | if (unlikely(opt->optlen)) | |
1581 | ip_forward_options(skb); | |
1582 | ||
1583 | return dst_output(skb); | |
1584 | } | |
1585 | ||
1586 | /* | |
1587 | * Processing handlers for ipmr_forward | |
1588 | */ | |
1589 | ||
1590 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, | |
1591 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1592 | { | |
1593 | const struct iphdr *iph = ip_hdr(skb); | |
1594 | struct vif_device *vif = &mrt->vif_table[vifi]; | |
1595 | struct net_device *dev; | |
1596 | struct rtable *rt; | |
1597 | struct flowi4 fl4; | |
1598 | int encap = 0; | |
1599 | ||
1600 | if (vif->dev == NULL) | |
1601 | goto out_free; | |
1602 | ||
1603 | #ifdef CONFIG_IP_PIMSM | |
1604 | if (vif->flags & VIFF_REGISTER) { | |
1605 | vif->pkt_out++; | |
1606 | vif->bytes_out += skb->len; | |
1607 | vif->dev->stats.tx_bytes += skb->len; | |
1608 | vif->dev->stats.tx_packets++; | |
1609 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); | |
1610 | goto out_free; | |
1611 | } | |
1612 | #endif | |
1613 | ||
1614 | if (vif->flags & VIFF_TUNNEL) { | |
1615 | rt = ip_route_output_ports(net, &fl4, NULL, | |
1616 | vif->remote, vif->local, | |
1617 | 0, 0, | |
1618 | IPPROTO_IPIP, | |
1619 | RT_TOS(iph->tos), vif->link); | |
1620 | if (IS_ERR(rt)) | |
1621 | goto out_free; | |
1622 | encap = sizeof(struct iphdr); | |
1623 | } else { | |
1624 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, | |
1625 | 0, 0, | |
1626 | IPPROTO_IPIP, | |
1627 | RT_TOS(iph->tos), vif->link); | |
1628 | if (IS_ERR(rt)) | |
1629 | goto out_free; | |
1630 | } | |
1631 | ||
1632 | dev = rt->dst.dev; | |
1633 | ||
1634 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1635 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1636 | * allow to send ICMP, so that packets will disappear | |
1637 | * to blackhole. | |
1638 | */ | |
1639 | ||
1640 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); | |
1641 | ip_rt_put(rt); | |
1642 | goto out_free; | |
1643 | } | |
1644 | ||
1645 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; | |
1646 | ||
1647 | if (skb_cow(skb, encap)) { | |
1648 | ip_rt_put(rt); | |
1649 | goto out_free; | |
1650 | } | |
1651 | ||
1652 | vif->pkt_out++; | |
1653 | vif->bytes_out += skb->len; | |
1654 | ||
1655 | skb_dst_drop(skb); | |
1656 | skb_dst_set(skb, &rt->dst); | |
1657 | ip_decrease_ttl(ip_hdr(skb)); | |
1658 | ||
1659 | /* FIXME: forward and output firewalls used to be called here. | |
1660 | * What do we do with netfilter? -- RR | |
1661 | */ | |
1662 | if (vif->flags & VIFF_TUNNEL) { | |
1663 | ip_encap(skb, vif->local, vif->remote); | |
1664 | /* FIXME: extra output firewall step used to be here. --RR */ | |
1665 | vif->dev->stats.tx_packets++; | |
1666 | vif->dev->stats.tx_bytes += skb->len; | |
1667 | } | |
1668 | ||
1669 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1670 | ||
1671 | /* | |
1672 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1673 | * not only before forwarding, but after forwarding on all output | |
1674 | * interfaces. It is clear, if mrouter runs a multicasting | |
1675 | * program, it should receive packets not depending to what interface | |
1676 | * program is joined. | |
1677 | * If we will not make it, the program will have to join on all | |
1678 | * interfaces. On the other hand, multihoming host (or router, but | |
1679 | * not mrouter) cannot join to more than one interface - it will | |
1680 | * result in receiving multiple packets. | |
1681 | */ | |
1682 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, | |
1683 | ipmr_forward_finish); | |
1684 | return; | |
1685 | ||
1686 | out_free: | |
1687 | kfree_skb(skb); | |
1688 | } | |
1689 | ||
1690 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) | |
1691 | { | |
1692 | int ct; | |
1693 | ||
1694 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1695 | if (mrt->vif_table[ct].dev == dev) | |
1696 | break; | |
1697 | } | |
1698 | return ct; | |
1699 | } | |
1700 | ||
1701 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1702 | ||
1703 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, | |
1704 | struct sk_buff *skb, struct mfc_cache *cache, | |
1705 | int local) | |
1706 | { | |
1707 | int psend = -1; | |
1708 | int vif, ct; | |
1709 | ||
1710 | vif = cache->mfc_parent; | |
1711 | cache->mfc_un.res.pkt++; | |
1712 | cache->mfc_un.res.bytes += skb->len; | |
1713 | ||
1714 | /* | |
1715 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1716 | */ | |
1717 | if (mrt->vif_table[vif].dev != skb->dev) { | |
1718 | int true_vifi; | |
1719 | ||
1720 | if (rt_is_output_route(skb_rtable(skb))) { | |
1721 | /* It is our own packet, looped back. | |
1722 | * Very complicated situation... | |
1723 | * | |
1724 | * The best workaround until routing daemons will be | |
1725 | * fixed is not to redistribute packet, if it was | |
1726 | * send through wrong interface. It means, that | |
1727 | * multicast applications WILL NOT work for | |
1728 | * (S,G), which have default multicast route pointing | |
1729 | * to wrong oif. In any case, it is not a good | |
1730 | * idea to use multicasting applications on router. | |
1731 | */ | |
1732 | goto dont_forward; | |
1733 | } | |
1734 | ||
1735 | cache->mfc_un.res.wrong_if++; | |
1736 | true_vifi = ipmr_find_vif(mrt, skb->dev); | |
1737 | ||
1738 | if (true_vifi >= 0 && mrt->mroute_do_assert && | |
1739 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1740 | * so that we cannot check that packet arrived on an oif. | |
1741 | * It is bad, but otherwise we would need to move pretty | |
1742 | * large chunk of pimd to kernel. Ough... --ANK | |
1743 | */ | |
1744 | (mrt->mroute_do_pim || | |
1745 | cache->mfc_un.res.ttls[true_vifi] < 255) && | |
1746 | time_after(jiffies, | |
1747 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1748 | cache->mfc_un.res.last_assert = jiffies; | |
1749 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); | |
1750 | } | |
1751 | goto dont_forward; | |
1752 | } | |
1753 | ||
1754 | mrt->vif_table[vif].pkt_in++; | |
1755 | mrt->vif_table[vif].bytes_in += skb->len; | |
1756 | ||
1757 | /* | |
1758 | * Forward the frame | |
1759 | */ | |
1760 | for (ct = cache->mfc_un.res.maxvif - 1; | |
1761 | ct >= cache->mfc_un.res.minvif; ct--) { | |
1762 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { | |
1763 | if (psend != -1) { | |
1764 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1765 | ||
1766 | if (skb2) | |
1767 | ipmr_queue_xmit(net, mrt, skb2, cache, | |
1768 | psend); | |
1769 | } | |
1770 | psend = ct; | |
1771 | } | |
1772 | } | |
1773 | if (psend != -1) { | |
1774 | if (local) { | |
1775 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1776 | ||
1777 | if (skb2) | |
1778 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); | |
1779 | } else { | |
1780 | ipmr_queue_xmit(net, mrt, skb, cache, psend); | |
1781 | return 0; | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | dont_forward: | |
1786 | if (!local) | |
1787 | kfree_skb(skb); | |
1788 | return 0; | |
1789 | } | |
1790 | ||
1791 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) | |
1792 | { | |
1793 | struct rtable *rt = skb_rtable(skb); | |
1794 | struct iphdr *iph = ip_hdr(skb); | |
1795 | struct flowi4 fl4 = { | |
1796 | .daddr = iph->daddr, | |
1797 | .saddr = iph->saddr, | |
1798 | .flowi4_tos = RT_TOS(iph->tos), | |
1799 | .flowi4_oif = rt->rt_oif, | |
1800 | .flowi4_iif = rt->rt_iif, | |
1801 | .flowi4_mark = rt->rt_mark, | |
1802 | }; | |
1803 | struct mr_table *mrt; | |
1804 | int err; | |
1805 | ||
1806 | err = ipmr_fib_lookup(net, &fl4, &mrt); | |
1807 | if (err) | |
1808 | return ERR_PTR(err); | |
1809 | return mrt; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Multicast packets for forwarding arrive here | |
1814 | * Called with rcu_read_lock(); | |
1815 | */ | |
1816 | ||
1817 | int ip_mr_input(struct sk_buff *skb) | |
1818 | { | |
1819 | struct mfc_cache *cache; | |
1820 | struct net *net = dev_net(skb->dev); | |
1821 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; | |
1822 | struct mr_table *mrt; | |
1823 | ||
1824 | /* Packet is looped back after forward, it should not be | |
1825 | * forwarded second time, but still can be delivered locally. | |
1826 | */ | |
1827 | if (IPCB(skb)->flags & IPSKB_FORWARDED) | |
1828 | goto dont_forward; | |
1829 | ||
1830 | mrt = ipmr_rt_fib_lookup(net, skb); | |
1831 | if (IS_ERR(mrt)) { | |
1832 | kfree_skb(skb); | |
1833 | return PTR_ERR(mrt); | |
1834 | } | |
1835 | if (!local) { | |
1836 | if (IPCB(skb)->opt.router_alert) { | |
1837 | if (ip_call_ra_chain(skb)) | |
1838 | return 0; | |
1839 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1840 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1841 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1842 | * option to IGMP packets destined to routable | |
1843 | * groups. It is very bad, because it means | |
1844 | * that we can forward NO IGMP messages. | |
1845 | */ | |
1846 | struct sock *mroute_sk; | |
1847 | ||
1848 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1849 | if (mroute_sk) { | |
1850 | nf_reset(skb); | |
1851 | raw_rcv(mroute_sk, skb); | |
1852 | return 0; | |
1853 | } | |
1854 | } | |
1855 | } | |
1856 | ||
1857 | /* already under rcu_read_lock() */ | |
1858 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); | |
1859 | ||
1860 | /* | |
1861 | * No usable cache entry | |
1862 | */ | |
1863 | if (cache == NULL) { | |
1864 | int vif; | |
1865 | ||
1866 | if (local) { | |
1867 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1868 | ip_local_deliver(skb); | |
1869 | if (skb2 == NULL) | |
1870 | return -ENOBUFS; | |
1871 | skb = skb2; | |
1872 | } | |
1873 | ||
1874 | read_lock(&mrt_lock); | |
1875 | vif = ipmr_find_vif(mrt, skb->dev); | |
1876 | if (vif >= 0) { | |
1877 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); | |
1878 | read_unlock(&mrt_lock); | |
1879 | ||
1880 | return err2; | |
1881 | } | |
1882 | read_unlock(&mrt_lock); | |
1883 | kfree_skb(skb); | |
1884 | return -ENODEV; | |
1885 | } | |
1886 | ||
1887 | read_lock(&mrt_lock); | |
1888 | ip_mr_forward(net, mrt, skb, cache, local); | |
1889 | read_unlock(&mrt_lock); | |
1890 | ||
1891 | if (local) | |
1892 | return ip_local_deliver(skb); | |
1893 | ||
1894 | return 0; | |
1895 | ||
1896 | dont_forward: | |
1897 | if (local) | |
1898 | return ip_local_deliver(skb); | |
1899 | kfree_skb(skb); | |
1900 | return 0; | |
1901 | } | |
1902 | ||
1903 | #ifdef CONFIG_IP_PIMSM | |
1904 | /* called with rcu_read_lock() */ | |
1905 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, | |
1906 | unsigned int pimlen) | |
1907 | { | |
1908 | struct net_device *reg_dev = NULL; | |
1909 | struct iphdr *encap; | |
1910 | ||
1911 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); | |
1912 | /* | |
1913 | * Check that: | |
1914 | * a. packet is really sent to a multicast group | |
1915 | * b. packet is not a NULL-REGISTER | |
1916 | * c. packet is not truncated | |
1917 | */ | |
1918 | if (!ipv4_is_multicast(encap->daddr) || | |
1919 | encap->tot_len == 0 || | |
1920 | ntohs(encap->tot_len) + pimlen > skb->len) | |
1921 | return 1; | |
1922 | ||
1923 | read_lock(&mrt_lock); | |
1924 | if (mrt->mroute_reg_vif_num >= 0) | |
1925 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1926 | read_unlock(&mrt_lock); | |
1927 | ||
1928 | if (reg_dev == NULL) | |
1929 | return 1; | |
1930 | ||
1931 | skb->mac_header = skb->network_header; | |
1932 | skb_pull(skb, (u8 *)encap - skb->data); | |
1933 | skb_reset_network_header(skb); | |
1934 | skb->protocol = htons(ETH_P_IP); | |
1935 | skb->ip_summed = CHECKSUM_NONE; | |
1936 | skb->pkt_type = PACKET_HOST; | |
1937 | ||
1938 | skb_tunnel_rx(skb, reg_dev); | |
1939 | ||
1940 | netif_rx(skb); | |
1941 | ||
1942 | return NET_RX_SUCCESS; | |
1943 | } | |
1944 | #endif | |
1945 | ||
1946 | #ifdef CONFIG_IP_PIMSM_V1 | |
1947 | /* | |
1948 | * Handle IGMP messages of PIMv1 | |
1949 | */ | |
1950 | ||
1951 | int pim_rcv_v1(struct sk_buff *skb) | |
1952 | { | |
1953 | struct igmphdr *pim; | |
1954 | struct net *net = dev_net(skb->dev); | |
1955 | struct mr_table *mrt; | |
1956 | ||
1957 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1958 | goto drop; | |
1959 | ||
1960 | pim = igmp_hdr(skb); | |
1961 | ||
1962 | mrt = ipmr_rt_fib_lookup(net, skb); | |
1963 | if (IS_ERR(mrt)) | |
1964 | goto drop; | |
1965 | if (!mrt->mroute_do_pim || | |
1966 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) | |
1967 | goto drop; | |
1968 | ||
1969 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { | |
1970 | drop: | |
1971 | kfree_skb(skb); | |
1972 | } | |
1973 | return 0; | |
1974 | } | |
1975 | #endif | |
1976 | ||
1977 | #ifdef CONFIG_IP_PIMSM_V2 | |
1978 | static int pim_rcv(struct sk_buff *skb) | |
1979 | { | |
1980 | struct pimreghdr *pim; | |
1981 | struct net *net = dev_net(skb->dev); | |
1982 | struct mr_table *mrt; | |
1983 | ||
1984 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1985 | goto drop; | |
1986 | ||
1987 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
1988 | if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || | |
1989 | (pim->flags & PIM_NULL_REGISTER) || | |
1990 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && | |
1991 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) | |
1992 | goto drop; | |
1993 | ||
1994 | mrt = ipmr_rt_fib_lookup(net, skb); | |
1995 | if (IS_ERR(mrt)) | |
1996 | goto drop; | |
1997 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { | |
1998 | drop: | |
1999 | kfree_skb(skb); | |
2000 | } | |
2001 | return 0; | |
2002 | } | |
2003 | #endif | |
2004 | ||
2005 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, | |
2006 | struct mfc_cache *c, struct rtmsg *rtm) | |
2007 | { | |
2008 | int ct; | |
2009 | struct rtnexthop *nhp; | |
2010 | u8 *b = skb_tail_pointer(skb); | |
2011 | struct rtattr *mp_head; | |
2012 | ||
2013 | /* If cache is unresolved, don't try to parse IIF and OIF */ | |
2014 | if (c->mfc_parent >= MAXVIFS) | |
2015 | return -ENOENT; | |
2016 | ||
2017 | if (VIF_EXISTS(mrt, c->mfc_parent)) | |
2018 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex); | |
2019 | ||
2020 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
2021 | ||
2022 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
2023 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { | |
2024 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
2025 | goto rtattr_failure; | |
2026 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
2027 | nhp->rtnh_flags = 0; | |
2028 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
2029 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; | |
2030 | nhp->rtnh_len = sizeof(*nhp); | |
2031 | } | |
2032 | } | |
2033 | mp_head->rta_type = RTA_MULTIPATH; | |
2034 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; | |
2035 | rtm->rtm_type = RTN_MULTICAST; | |
2036 | return 1; | |
2037 | ||
2038 | rtattr_failure: | |
2039 | nlmsg_trim(skb, b); | |
2040 | return -EMSGSIZE; | |
2041 | } | |
2042 | ||
2043 | int ipmr_get_route(struct net *net, struct sk_buff *skb, | |
2044 | __be32 saddr, __be32 daddr, | |
2045 | struct rtmsg *rtm, int nowait) | |
2046 | { | |
2047 | struct mfc_cache *cache; | |
2048 | struct mr_table *mrt; | |
2049 | int err; | |
2050 | ||
2051 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2052 | if (mrt == NULL) | |
2053 | return -ENOENT; | |
2054 | ||
2055 | rcu_read_lock(); | |
2056 | cache = ipmr_cache_find(mrt, saddr, daddr); | |
2057 | ||
2058 | if (cache == NULL) { | |
2059 | struct sk_buff *skb2; | |
2060 | struct iphdr *iph; | |
2061 | struct net_device *dev; | |
2062 | int vif = -1; | |
2063 | ||
2064 | if (nowait) { | |
2065 | rcu_read_unlock(); | |
2066 | return -EAGAIN; | |
2067 | } | |
2068 | ||
2069 | dev = skb->dev; | |
2070 | read_lock(&mrt_lock); | |
2071 | if (dev) | |
2072 | vif = ipmr_find_vif(mrt, dev); | |
2073 | if (vif < 0) { | |
2074 | read_unlock(&mrt_lock); | |
2075 | rcu_read_unlock(); | |
2076 | return -ENODEV; | |
2077 | } | |
2078 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
2079 | if (!skb2) { | |
2080 | read_unlock(&mrt_lock); | |
2081 | rcu_read_unlock(); | |
2082 | return -ENOMEM; | |
2083 | } | |
2084 | ||
2085 | skb_push(skb2, sizeof(struct iphdr)); | |
2086 | skb_reset_network_header(skb2); | |
2087 | iph = ip_hdr(skb2); | |
2088 | iph->ihl = sizeof(struct iphdr) >> 2; | |
2089 | iph->saddr = saddr; | |
2090 | iph->daddr = daddr; | |
2091 | iph->version = 0; | |
2092 | err = ipmr_cache_unresolved(mrt, vif, skb2); | |
2093 | read_unlock(&mrt_lock); | |
2094 | rcu_read_unlock(); | |
2095 | return err; | |
2096 | } | |
2097 | ||
2098 | read_lock(&mrt_lock); | |
2099 | if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) | |
2100 | cache->mfc_flags |= MFC_NOTIFY; | |
2101 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); | |
2102 | read_unlock(&mrt_lock); | |
2103 | rcu_read_unlock(); | |
2104 | return err; | |
2105 | } | |
2106 | ||
2107 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, | |
2108 | u32 pid, u32 seq, struct mfc_cache *c) | |
2109 | { | |
2110 | struct nlmsghdr *nlh; | |
2111 | struct rtmsg *rtm; | |
2112 | ||
2113 | nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); | |
2114 | if (nlh == NULL) | |
2115 | return -EMSGSIZE; | |
2116 | ||
2117 | rtm = nlmsg_data(nlh); | |
2118 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2119 | rtm->rtm_dst_len = 32; | |
2120 | rtm->rtm_src_len = 32; | |
2121 | rtm->rtm_tos = 0; | |
2122 | rtm->rtm_table = mrt->id; | |
2123 | NLA_PUT_U32(skb, RTA_TABLE, mrt->id); | |
2124 | rtm->rtm_type = RTN_MULTICAST; | |
2125 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2126 | rtm->rtm_protocol = RTPROT_UNSPEC; | |
2127 | rtm->rtm_flags = 0; | |
2128 | ||
2129 | NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin); | |
2130 | NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp); | |
2131 | ||
2132 | if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0) | |
2133 | goto nla_put_failure; | |
2134 | ||
2135 | return nlmsg_end(skb, nlh); | |
2136 | ||
2137 | nla_put_failure: | |
2138 | nlmsg_cancel(skb, nlh); | |
2139 | return -EMSGSIZE; | |
2140 | } | |
2141 | ||
2142 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) | |
2143 | { | |
2144 | struct net *net = sock_net(skb->sk); | |
2145 | struct mr_table *mrt; | |
2146 | struct mfc_cache *mfc; | |
2147 | unsigned int t = 0, s_t; | |
2148 | unsigned int h = 0, s_h; | |
2149 | unsigned int e = 0, s_e; | |
2150 | ||
2151 | s_t = cb->args[0]; | |
2152 | s_h = cb->args[1]; | |
2153 | s_e = cb->args[2]; | |
2154 | ||
2155 | rcu_read_lock(); | |
2156 | ipmr_for_each_table(mrt, net) { | |
2157 | if (t < s_t) | |
2158 | goto next_table; | |
2159 | if (t > s_t) | |
2160 | s_h = 0; | |
2161 | for (h = s_h; h < MFC_LINES; h++) { | |
2162 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { | |
2163 | if (e < s_e) | |
2164 | goto next_entry; | |
2165 | if (ipmr_fill_mroute(mrt, skb, | |
2166 | NETLINK_CB(cb->skb).pid, | |
2167 | cb->nlh->nlmsg_seq, | |
2168 | mfc) < 0) | |
2169 | goto done; | |
2170 | next_entry: | |
2171 | e++; | |
2172 | } | |
2173 | e = s_e = 0; | |
2174 | } | |
2175 | s_h = 0; | |
2176 | next_table: | |
2177 | t++; | |
2178 | } | |
2179 | done: | |
2180 | rcu_read_unlock(); | |
2181 | ||
2182 | cb->args[2] = e; | |
2183 | cb->args[1] = h; | |
2184 | cb->args[0] = t; | |
2185 | ||
2186 | return skb->len; | |
2187 | } | |
2188 | ||
2189 | #ifdef CONFIG_PROC_FS | |
2190 | /* | |
2191 | * The /proc interfaces to multicast routing : | |
2192 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
2193 | */ | |
2194 | struct ipmr_vif_iter { | |
2195 | struct seq_net_private p; | |
2196 | struct mr_table *mrt; | |
2197 | int ct; | |
2198 | }; | |
2199 | ||
2200 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, | |
2201 | struct ipmr_vif_iter *iter, | |
2202 | loff_t pos) | |
2203 | { | |
2204 | struct mr_table *mrt = iter->mrt; | |
2205 | ||
2206 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2207 | if (!VIF_EXISTS(mrt, iter->ct)) | |
2208 | continue; | |
2209 | if (pos-- == 0) | |
2210 | return &mrt->vif_table[iter->ct]; | |
2211 | } | |
2212 | return NULL; | |
2213 | } | |
2214 | ||
2215 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
2216 | __acquires(mrt_lock) | |
2217 | { | |
2218 | struct ipmr_vif_iter *iter = seq->private; | |
2219 | struct net *net = seq_file_net(seq); | |
2220 | struct mr_table *mrt; | |
2221 | ||
2222 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2223 | if (mrt == NULL) | |
2224 | return ERR_PTR(-ENOENT); | |
2225 | ||
2226 | iter->mrt = mrt; | |
2227 | ||
2228 | read_lock(&mrt_lock); | |
2229 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) | |
2230 | : SEQ_START_TOKEN; | |
2231 | } | |
2232 | ||
2233 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2234 | { | |
2235 | struct ipmr_vif_iter *iter = seq->private; | |
2236 | struct net *net = seq_file_net(seq); | |
2237 | struct mr_table *mrt = iter->mrt; | |
2238 | ||
2239 | ++*pos; | |
2240 | if (v == SEQ_START_TOKEN) | |
2241 | return ipmr_vif_seq_idx(net, iter, 0); | |
2242 | ||
2243 | while (++iter->ct < mrt->maxvif) { | |
2244 | if (!VIF_EXISTS(mrt, iter->ct)) | |
2245 | continue; | |
2246 | return &mrt->vif_table[iter->ct]; | |
2247 | } | |
2248 | return NULL; | |
2249 | } | |
2250 | ||
2251 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
2252 | __releases(mrt_lock) | |
2253 | { | |
2254 | read_unlock(&mrt_lock); | |
2255 | } | |
2256 | ||
2257 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2258 | { | |
2259 | struct ipmr_vif_iter *iter = seq->private; | |
2260 | struct mr_table *mrt = iter->mrt; | |
2261 | ||
2262 | if (v == SEQ_START_TOKEN) { | |
2263 | seq_puts(seq, | |
2264 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); | |
2265 | } else { | |
2266 | const struct vif_device *vif = v; | |
2267 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2268 | ||
2269 | seq_printf(seq, | |
2270 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
2271 | vif - mrt->vif_table, | |
2272 | name, vif->bytes_in, vif->pkt_in, | |
2273 | vif->bytes_out, vif->pkt_out, | |
2274 | vif->flags, vif->local, vif->remote); | |
2275 | } | |
2276 | return 0; | |
2277 | } | |
2278 | ||
2279 | static const struct seq_operations ipmr_vif_seq_ops = { | |
2280 | .start = ipmr_vif_seq_start, | |
2281 | .next = ipmr_vif_seq_next, | |
2282 | .stop = ipmr_vif_seq_stop, | |
2283 | .show = ipmr_vif_seq_show, | |
2284 | }; | |
2285 | ||
2286 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2287 | { | |
2288 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, | |
2289 | sizeof(struct ipmr_vif_iter)); | |
2290 | } | |
2291 | ||
2292 | static const struct file_operations ipmr_vif_fops = { | |
2293 | .owner = THIS_MODULE, | |
2294 | .open = ipmr_vif_open, | |
2295 | .read = seq_read, | |
2296 | .llseek = seq_lseek, | |
2297 | .release = seq_release_net, | |
2298 | }; | |
2299 | ||
2300 | struct ipmr_mfc_iter { | |
2301 | struct seq_net_private p; | |
2302 | struct mr_table *mrt; | |
2303 | struct list_head *cache; | |
2304 | int ct; | |
2305 | }; | |
2306 | ||
2307 | ||
2308 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, | |
2309 | struct ipmr_mfc_iter *it, loff_t pos) | |
2310 | { | |
2311 | struct mr_table *mrt = it->mrt; | |
2312 | struct mfc_cache *mfc; | |
2313 | ||
2314 | rcu_read_lock(); | |
2315 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { | |
2316 | it->cache = &mrt->mfc_cache_array[it->ct]; | |
2317 | list_for_each_entry_rcu(mfc, it->cache, list) | |
2318 | if (pos-- == 0) | |
2319 | return mfc; | |
2320 | } | |
2321 | rcu_read_unlock(); | |
2322 | ||
2323 | spin_lock_bh(&mfc_unres_lock); | |
2324 | it->cache = &mrt->mfc_unres_queue; | |
2325 | list_for_each_entry(mfc, it->cache, list) | |
2326 | if (pos-- == 0) | |
2327 | return mfc; | |
2328 | spin_unlock_bh(&mfc_unres_lock); | |
2329 | ||
2330 | it->cache = NULL; | |
2331 | return NULL; | |
2332 | } | |
2333 | ||
2334 | ||
2335 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2336 | { | |
2337 | struct ipmr_mfc_iter *it = seq->private; | |
2338 | struct net *net = seq_file_net(seq); | |
2339 | struct mr_table *mrt; | |
2340 | ||
2341 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2342 | if (mrt == NULL) | |
2343 | return ERR_PTR(-ENOENT); | |
2344 | ||
2345 | it->mrt = mrt; | |
2346 | it->cache = NULL; | |
2347 | it->ct = 0; | |
2348 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) | |
2349 | : SEQ_START_TOKEN; | |
2350 | } | |
2351 | ||
2352 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2353 | { | |
2354 | struct mfc_cache *mfc = v; | |
2355 | struct ipmr_mfc_iter *it = seq->private; | |
2356 | struct net *net = seq_file_net(seq); | |
2357 | struct mr_table *mrt = it->mrt; | |
2358 | ||
2359 | ++*pos; | |
2360 | ||
2361 | if (v == SEQ_START_TOKEN) | |
2362 | return ipmr_mfc_seq_idx(net, seq->private, 0); | |
2363 | ||
2364 | if (mfc->list.next != it->cache) | |
2365 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
2366 | ||
2367 | if (it->cache == &mrt->mfc_unres_queue) | |
2368 | goto end_of_list; | |
2369 | ||
2370 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); | |
2371 | ||
2372 | while (++it->ct < MFC_LINES) { | |
2373 | it->cache = &mrt->mfc_cache_array[it->ct]; | |
2374 | if (list_empty(it->cache)) | |
2375 | continue; | |
2376 | return list_first_entry(it->cache, struct mfc_cache, list); | |
2377 | } | |
2378 | ||
2379 | /* exhausted cache_array, show unresolved */ | |
2380 | rcu_read_unlock(); | |
2381 | it->cache = &mrt->mfc_unres_queue; | |
2382 | it->ct = 0; | |
2383 | ||
2384 | spin_lock_bh(&mfc_unres_lock); | |
2385 | if (!list_empty(it->cache)) | |
2386 | return list_first_entry(it->cache, struct mfc_cache, list); | |
2387 | ||
2388 | end_of_list: | |
2389 | spin_unlock_bh(&mfc_unres_lock); | |
2390 | it->cache = NULL; | |
2391 | ||
2392 | return NULL; | |
2393 | } | |
2394 | ||
2395 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2396 | { | |
2397 | struct ipmr_mfc_iter *it = seq->private; | |
2398 | struct mr_table *mrt = it->mrt; | |
2399 | ||
2400 | if (it->cache == &mrt->mfc_unres_queue) | |
2401 | spin_unlock_bh(&mfc_unres_lock); | |
2402 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) | |
2403 | rcu_read_unlock(); | |
2404 | } | |
2405 | ||
2406 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2407 | { | |
2408 | int n; | |
2409 | ||
2410 | if (v == SEQ_START_TOKEN) { | |
2411 | seq_puts(seq, | |
2412 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); | |
2413 | } else { | |
2414 | const struct mfc_cache *mfc = v; | |
2415 | const struct ipmr_mfc_iter *it = seq->private; | |
2416 | const struct mr_table *mrt = it->mrt; | |
2417 | ||
2418 | seq_printf(seq, "%08X %08X %-3hd", | |
2419 | (__force u32) mfc->mfc_mcastgrp, | |
2420 | (__force u32) mfc->mfc_origin, | |
2421 | mfc->mfc_parent); | |
2422 | ||
2423 | if (it->cache != &mrt->mfc_unres_queue) { | |
2424 | seq_printf(seq, " %8lu %8lu %8lu", | |
2425 | mfc->mfc_un.res.pkt, | |
2426 | mfc->mfc_un.res.bytes, | |
2427 | mfc->mfc_un.res.wrong_if); | |
2428 | for (n = mfc->mfc_un.res.minvif; | |
2429 | n < mfc->mfc_un.res.maxvif; n++) { | |
2430 | if (VIF_EXISTS(mrt, n) && | |
2431 | mfc->mfc_un.res.ttls[n] < 255) | |
2432 | seq_printf(seq, | |
2433 | " %2d:%-3d", | |
2434 | n, mfc->mfc_un.res.ttls[n]); | |
2435 | } | |
2436 | } else { | |
2437 | /* unresolved mfc_caches don't contain | |
2438 | * pkt, bytes and wrong_if values | |
2439 | */ | |
2440 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
2441 | } | |
2442 | seq_putc(seq, '\n'); | |
2443 | } | |
2444 | return 0; | |
2445 | } | |
2446 | ||
2447 | static const struct seq_operations ipmr_mfc_seq_ops = { | |
2448 | .start = ipmr_mfc_seq_start, | |
2449 | .next = ipmr_mfc_seq_next, | |
2450 | .stop = ipmr_mfc_seq_stop, | |
2451 | .show = ipmr_mfc_seq_show, | |
2452 | }; | |
2453 | ||
2454 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2455 | { | |
2456 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, | |
2457 | sizeof(struct ipmr_mfc_iter)); | |
2458 | } | |
2459 | ||
2460 | static const struct file_operations ipmr_mfc_fops = { | |
2461 | .owner = THIS_MODULE, | |
2462 | .open = ipmr_mfc_open, | |
2463 | .read = seq_read, | |
2464 | .llseek = seq_lseek, | |
2465 | .release = seq_release_net, | |
2466 | }; | |
2467 | #endif | |
2468 | ||
2469 | #ifdef CONFIG_IP_PIMSM_V2 | |
2470 | static const struct net_protocol pim_protocol = { | |
2471 | .handler = pim_rcv, | |
2472 | .netns_ok = 1, | |
2473 | }; | |
2474 | #endif | |
2475 | ||
2476 | ||
2477 | /* | |
2478 | * Setup for IP multicast routing | |
2479 | */ | |
2480 | static int __net_init ipmr_net_init(struct net *net) | |
2481 | { | |
2482 | int err; | |
2483 | ||
2484 | err = ipmr_rules_init(net); | |
2485 | if (err < 0) | |
2486 | goto fail; | |
2487 | ||
2488 | #ifdef CONFIG_PROC_FS | |
2489 | err = -ENOMEM; | |
2490 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
2491 | goto proc_vif_fail; | |
2492 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
2493 | goto proc_cache_fail; | |
2494 | #endif | |
2495 | return 0; | |
2496 | ||
2497 | #ifdef CONFIG_PROC_FS | |
2498 | proc_cache_fail: | |
2499 | proc_net_remove(net, "ip_mr_vif"); | |
2500 | proc_vif_fail: | |
2501 | ipmr_rules_exit(net); | |
2502 | #endif | |
2503 | fail: | |
2504 | return err; | |
2505 | } | |
2506 | ||
2507 | static void __net_exit ipmr_net_exit(struct net *net) | |
2508 | { | |
2509 | #ifdef CONFIG_PROC_FS | |
2510 | proc_net_remove(net, "ip_mr_cache"); | |
2511 | proc_net_remove(net, "ip_mr_vif"); | |
2512 | #endif | |
2513 | ipmr_rules_exit(net); | |
2514 | } | |
2515 | ||
2516 | static struct pernet_operations ipmr_net_ops = { | |
2517 | .init = ipmr_net_init, | |
2518 | .exit = ipmr_net_exit, | |
2519 | }; | |
2520 | ||
2521 | int __init ip_mr_init(void) | |
2522 | { | |
2523 | int err; | |
2524 | ||
2525 | mrt_cachep = kmem_cache_create("ip_mrt_cache", | |
2526 | sizeof(struct mfc_cache), | |
2527 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, | |
2528 | NULL); | |
2529 | if (!mrt_cachep) | |
2530 | return -ENOMEM; | |
2531 | ||
2532 | err = register_pernet_subsys(&ipmr_net_ops); | |
2533 | if (err) | |
2534 | goto reg_pernet_fail; | |
2535 | ||
2536 | err = register_netdevice_notifier(&ip_mr_notifier); | |
2537 | if (err) | |
2538 | goto reg_notif_fail; | |
2539 | #ifdef CONFIG_IP_PIMSM_V2 | |
2540 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
2541 | pr_err("%s: can't add PIM protocol\n", __func__); | |
2542 | err = -EAGAIN; | |
2543 | goto add_proto_fail; | |
2544 | } | |
2545 | #endif | |
2546 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, | |
2547 | NULL, ipmr_rtm_dumproute, NULL); | |
2548 | return 0; | |
2549 | ||
2550 | #ifdef CONFIG_IP_PIMSM_V2 | |
2551 | add_proto_fail: | |
2552 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2553 | #endif | |
2554 | reg_notif_fail: | |
2555 | unregister_pernet_subsys(&ipmr_net_ops); | |
2556 | reg_pernet_fail: | |
2557 | kmem_cache_destroy(mrt_cachep); | |
2558 | return err; | |
2559 | } |