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