]> bbs.cooldavid.org Git - net-next-2.6.git/blame_incremental - net/ipv4/ipmr.c
git://bbs.cooldavid.org / net-next-2.6.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
net: use the macros defined for the members of flowi
[net-next-2.6.git] / net / ipv4 / ipmr.c
... / ...
CommitLineData
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 <net/ipip.h>
64#include <net/checksum.h>
65#include <net/netlink.h>
66#include <net/fib_rules.h>
67
68#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
69#define CONFIG_IP_PIMSM 1
70#endif
71
72struct mr_table {
73 struct list_head list;
74#ifdef CONFIG_NET_NS
75 struct net *net;
76#endif
77 u32 id;
78 struct sock __rcu *mroute_sk;
79 struct timer_list ipmr_expire_timer;
80 struct list_head mfc_unres_queue;
81 struct list_head mfc_cache_array[MFC_LINES];
82 struct vif_device vif_table[MAXVIFS];
83 int maxvif;
84 atomic_t cache_resolve_queue_len;
85 int mroute_do_assert;
86 int mroute_do_pim;
87#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
88 int mroute_reg_vif_num;
89#endif
90};
91
92struct ipmr_rule {
93 struct fib_rule common;
94};
95
96struct ipmr_result {
97 struct mr_table *mrt;
98};
99
100/* Big lock, protecting vif table, mrt cache and mroute socket state.
101 * Note that the changes are semaphored via rtnl_lock.
102 */
103
104static DEFINE_RWLOCK(mrt_lock);
105
106/*
107 * Multicast router control variables
108 */
109
110#define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL)
111
112/* Special spinlock for queue of unresolved entries */
113static DEFINE_SPINLOCK(mfc_unres_lock);
114
115/* We return to original Alan's scheme. Hash table of resolved
116 * entries is changed only in process context and protected
117 * with weak lock mrt_lock. Queue of unresolved entries is protected
118 * with strong spinlock mfc_unres_lock.
119 *
120 * In this case data path is free of exclusive locks at all.
121 */
122
123static struct kmem_cache *mrt_cachep __read_mostly;
124
125static struct mr_table *ipmr_new_table(struct net *net, u32 id);
126static int ip_mr_forward(struct net *net, struct mr_table *mrt,
127 struct sk_buff *skb, struct mfc_cache *cache,
128 int local);
129static int ipmr_cache_report(struct mr_table *mrt,
130 struct sk_buff *pkt, vifi_t vifi, int assert);
131static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
132 struct mfc_cache *c, struct rtmsg *rtm);
133static void ipmr_expire_process(unsigned long arg);
134
135#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
136#define ipmr_for_each_table(mrt, net) \
137 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
138
139static struct mr_table *ipmr_get_table(struct net *net, u32 id)
140{
141 struct mr_table *mrt;
142
143 ipmr_for_each_table(mrt, net) {
144 if (mrt->id == id)
145 return mrt;
146 }
147 return NULL;
148}
149
150static int ipmr_fib_lookup(struct net *net, struct flowi *flp,
151 struct mr_table **mrt)
152{
153 struct ipmr_result res;
154 struct fib_lookup_arg arg = { .result = &res, };
155 int err;
156
157 err = fib_rules_lookup(net->ipv4.mr_rules_ops, flp, 0, &arg);
158 if (err < 0)
159 return err;
160 *mrt = res.mrt;
161 return 0;
162}
163
164static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
165 int flags, struct fib_lookup_arg *arg)
166{
167 struct ipmr_result *res = arg->result;
168 struct mr_table *mrt;
169
170 switch (rule->action) {
171 case FR_ACT_TO_TBL:
172 break;
173 case FR_ACT_UNREACHABLE:
174 return -ENETUNREACH;
175 case FR_ACT_PROHIBIT:
176 return -EACCES;
177 case FR_ACT_BLACKHOLE:
178 default:
179 return -EINVAL;
180 }
181
182 mrt = ipmr_get_table(rule->fr_net, rule->table);
183 if (mrt == NULL)
184 return -EAGAIN;
185 res->mrt = mrt;
186 return 0;
187}
188
189static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
190{
191 return 1;
192}
193
194static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
195 FRA_GENERIC_POLICY,
196};
197
198static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
199 struct fib_rule_hdr *frh, struct nlattr **tb)
200{
201 return 0;
202}
203
204static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
205 struct nlattr **tb)
206{
207 return 1;
208}
209
210static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
211 struct fib_rule_hdr *frh)
212{
213 frh->dst_len = 0;
214 frh->src_len = 0;
215 frh->tos = 0;
216 return 0;
217}
218
219static const struct fib_rules_ops __net_initdata ipmr_rules_ops_template = {
220 .family = RTNL_FAMILY_IPMR,
221 .rule_size = sizeof(struct ipmr_rule),
222 .addr_size = sizeof(u32),
223 .action = ipmr_rule_action,
224 .match = ipmr_rule_match,
225 .configure = ipmr_rule_configure,
226 .compare = ipmr_rule_compare,
227 .default_pref = fib_default_rule_pref,
228 .fill = ipmr_rule_fill,
229 .nlgroup = RTNLGRP_IPV4_RULE,
230 .policy = ipmr_rule_policy,
231 .owner = THIS_MODULE,
232};
233
234static int __net_init ipmr_rules_init(struct net *net)
235{
236 struct fib_rules_ops *ops;
237 struct mr_table *mrt;
238 int err;
239
240 ops = fib_rules_register(&ipmr_rules_ops_template, net);
241 if (IS_ERR(ops))
242 return PTR_ERR(ops);
243
244 INIT_LIST_HEAD(&net->ipv4.mr_tables);
245
246 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
247 if (mrt == NULL) {
248 err = -ENOMEM;
249 goto err1;
250 }
251
252 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
253 if (err < 0)
254 goto err2;
255
256 net->ipv4.mr_rules_ops = ops;
257 return 0;
258
259err2:
260 kfree(mrt);
261err1:
262 fib_rules_unregister(ops);
263 return err;
264}
265
266static void __net_exit ipmr_rules_exit(struct net *net)
267{
268 struct mr_table *mrt, *next;
269
270 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
271 list_del(&mrt->list);
272 kfree(mrt);
273 }
274 fib_rules_unregister(net->ipv4.mr_rules_ops);
275}
276#else
277#define ipmr_for_each_table(mrt, net) \
278 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
279
280static struct mr_table *ipmr_get_table(struct net *net, u32 id)
281{
282 return net->ipv4.mrt;
283}
284
285static int ipmr_fib_lookup(struct net *net, struct flowi *flp,
286 struct mr_table **mrt)
287{
288 *mrt = net->ipv4.mrt;
289 return 0;
290}
291
292static int __net_init ipmr_rules_init(struct net *net)
293{
294 net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
295 return net->ipv4.mrt ? 0 : -ENOMEM;
296}
297
298static void __net_exit ipmr_rules_exit(struct net *net)
299{
300 kfree(net->ipv4.mrt);
301}
302#endif
303
304static struct mr_table *ipmr_new_table(struct net *net, u32 id)
305{
306 struct mr_table *mrt;
307 unsigned int i;
308
309 mrt = ipmr_get_table(net, id);
310 if (mrt != NULL)
311 return mrt;
312
313 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
314 if (mrt == NULL)
315 return NULL;
316 write_pnet(&mrt->net, net);
317 mrt->id = id;
318
319 /* Forwarding cache */
320 for (i = 0; i < MFC_LINES; i++)
321 INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
322
323 INIT_LIST_HEAD(&mrt->mfc_unres_queue);
324
325 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
326 (unsigned long)mrt);
327
328#ifdef CONFIG_IP_PIMSM
329 mrt->mroute_reg_vif_num = -1;
330#endif
331#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
332 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
333#endif
334 return mrt;
335}
336
337/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
338
339static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
340{
341 struct net *net = dev_net(dev);
342
343 dev_close(dev);
344
345 dev = __dev_get_by_name(net, "tunl0");
346 if (dev) {
347 const struct net_device_ops *ops = dev->netdev_ops;
348 struct ifreq ifr;
349 struct ip_tunnel_parm p;
350
351 memset(&p, 0, sizeof(p));
352 p.iph.daddr = v->vifc_rmt_addr.s_addr;
353 p.iph.saddr = v->vifc_lcl_addr.s_addr;
354 p.iph.version = 4;
355 p.iph.ihl = 5;
356 p.iph.protocol = IPPROTO_IPIP;
357 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
358 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
359
360 if (ops->ndo_do_ioctl) {
361 mm_segment_t oldfs = get_fs();
362
363 set_fs(KERNEL_DS);
364 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
365 set_fs(oldfs);
366 }
367 }
368}
369
370static
371struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
372{
373 struct net_device *dev;
374
375 dev = __dev_get_by_name(net, "tunl0");
376
377 if (dev) {
378 const struct net_device_ops *ops = dev->netdev_ops;
379 int err;
380 struct ifreq ifr;
381 struct ip_tunnel_parm p;
382 struct in_device *in_dev;
383
384 memset(&p, 0, sizeof(p));
385 p.iph.daddr = v->vifc_rmt_addr.s_addr;
386 p.iph.saddr = v->vifc_lcl_addr.s_addr;
387 p.iph.version = 4;
388 p.iph.ihl = 5;
389 p.iph.protocol = IPPROTO_IPIP;
390 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
391 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
392
393 if (ops->ndo_do_ioctl) {
394 mm_segment_t oldfs = get_fs();
395
396 set_fs(KERNEL_DS);
397 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
398 set_fs(oldfs);
399 } else {
400 err = -EOPNOTSUPP;
401 }
402 dev = NULL;
403
404 if (err == 0 &&
405 (dev = __dev_get_by_name(net, p.name)) != NULL) {
406 dev->flags |= IFF_MULTICAST;
407
408 in_dev = __in_dev_get_rtnl(dev);
409 if (in_dev == NULL)
410 goto failure;
411
412 ipv4_devconf_setall(in_dev);
413 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
414
415 if (dev_open(dev))
416 goto failure;
417 dev_hold(dev);
418 }
419 }
420 return dev;
421
422failure:
423 /* allow the register to be completed before unregistering. */
424 rtnl_unlock();
425 rtnl_lock();
426
427 unregister_netdevice(dev);
428 return NULL;
429}
430
431#ifdef CONFIG_IP_PIMSM
432
433static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
434{
435 struct net *net = dev_net(dev);
436 struct mr_table *mrt;
437 struct flowi fl = {
438 .oif = dev->ifindex,
439 .iif = skb->skb_iif,
440 .mark = skb->mark,
441 };
442 int err;
443
444 err = ipmr_fib_lookup(net, &fl, &mrt);
445 if (err < 0) {
446 kfree_skb(skb);
447 return err;
448 }
449
450 read_lock(&mrt_lock);
451 dev->stats.tx_bytes += skb->len;
452 dev->stats.tx_packets++;
453 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
454 read_unlock(&mrt_lock);
455 kfree_skb(skb);
456 return NETDEV_TX_OK;
457}
458
459static const struct net_device_ops reg_vif_netdev_ops = {
460 .ndo_start_xmit = reg_vif_xmit,
461};
462
463static void reg_vif_setup(struct net_device *dev)
464{
465 dev->type = ARPHRD_PIMREG;
466 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
467 dev->flags = IFF_NOARP;
468 dev->netdev_ops = &reg_vif_netdev_ops,
469 dev->destructor = free_netdev;
470 dev->features |= NETIF_F_NETNS_LOCAL;
471}
472
473static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
474{
475 struct net_device *dev;
476 struct in_device *in_dev;
477 char name[IFNAMSIZ];
478
479 if (mrt->id == RT_TABLE_DEFAULT)
480 sprintf(name, "pimreg");
481 else
482 sprintf(name, "pimreg%u", mrt->id);
483
484 dev = alloc_netdev(0, name, reg_vif_setup);
485
486 if (dev == NULL)
487 return NULL;
488
489 dev_net_set(dev, net);
490
491 if (register_netdevice(dev)) {
492 free_netdev(dev);
493 return NULL;
494 }
495 dev->iflink = 0;
496
497 rcu_read_lock();
498 in_dev = __in_dev_get_rcu(dev);
499 if (!in_dev) {
500 rcu_read_unlock();
501 goto failure;
502 }
503
504 ipv4_devconf_setall(in_dev);
505 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
506 rcu_read_unlock();
507
508 if (dev_open(dev))
509 goto failure;
510
511 dev_hold(dev);
512
513 return dev;
514
515failure:
516 /* allow the register to be completed before unregistering. */
517 rtnl_unlock();
518 rtnl_lock();
519
520 unregister_netdevice(dev);
521 return NULL;
522}
523#endif
524
525/*
526 * Delete a VIF entry
527 * @notify: Set to 1, if the caller is a notifier_call
528 */
529
530static int vif_delete(struct mr_table *mrt, int vifi, int notify,
531 struct list_head *head)
532{
533 struct vif_device *v;
534 struct net_device *dev;
535 struct in_device *in_dev;
536
537 if (vifi < 0 || vifi >= mrt->maxvif)
538 return -EADDRNOTAVAIL;
539
540 v = &mrt->vif_table[vifi];
541
542 write_lock_bh(&mrt_lock);
543 dev = v->dev;
544 v->dev = NULL;
545
546 if (!dev) {
547 write_unlock_bh(&mrt_lock);
548 return -EADDRNOTAVAIL;
549 }
550
551#ifdef CONFIG_IP_PIMSM
552 if (vifi == mrt->mroute_reg_vif_num)
553 mrt->mroute_reg_vif_num = -1;
554#endif
555
556 if (vifi + 1 == mrt->maxvif) {
557 int tmp;
558
559 for (tmp = vifi - 1; tmp >= 0; tmp--) {
560 if (VIF_EXISTS(mrt, tmp))
561 break;
562 }
563 mrt->maxvif = tmp+1;
564 }
565
566 write_unlock_bh(&mrt_lock);
567
568 dev_set_allmulti(dev, -1);
569
570 in_dev = __in_dev_get_rtnl(dev);
571 if (in_dev) {
572 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
573 ip_rt_multicast_event(in_dev);
574 }
575
576 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
577 unregister_netdevice_queue(dev, head);
578
579 dev_put(dev);
580 return 0;
581}
582
583static void ipmr_cache_free_rcu(struct rcu_head *head)
584{
585 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
586
587 kmem_cache_free(mrt_cachep, c);
588}
589
590static inline void ipmr_cache_free(struct mfc_cache *c)
591{
592 call_rcu(&c->rcu, ipmr_cache_free_rcu);
593}
594
595/* Destroy an unresolved cache entry, killing queued skbs
596 * and reporting error to netlink readers.
597 */
598
599static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
600{
601 struct net *net = read_pnet(&mrt->net);
602 struct sk_buff *skb;
603 struct nlmsgerr *e;
604
605 atomic_dec(&mrt->cache_resolve_queue_len);
606
607 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
608 if (ip_hdr(skb)->version == 0) {
609 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
610 nlh->nlmsg_type = NLMSG_ERROR;
611 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
612 skb_trim(skb, nlh->nlmsg_len);
613 e = NLMSG_DATA(nlh);
614 e->error = -ETIMEDOUT;
615 memset(&e->msg, 0, sizeof(e->msg));
616
617 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
618 } else {
619 kfree_skb(skb);
620 }
621 }
622
623 ipmr_cache_free(c);
624}
625
626
627/* Timer process for the unresolved queue. */
628
629static void ipmr_expire_process(unsigned long arg)
630{
631 struct mr_table *mrt = (struct mr_table *)arg;
632 unsigned long now;
633 unsigned long expires;
634 struct mfc_cache *c, *next;
635
636 if (!spin_trylock(&mfc_unres_lock)) {
637 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
638 return;
639 }
640
641 if (list_empty(&mrt->mfc_unres_queue))
642 goto out;
643
644 now = jiffies;
645 expires = 10*HZ;
646
647 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
648 if (time_after(c->mfc_un.unres.expires, now)) {
649 unsigned long interval = c->mfc_un.unres.expires - now;
650 if (interval < expires)
651 expires = interval;
652 continue;
653 }
654
655 list_del(&c->list);
656 ipmr_destroy_unres(mrt, c);
657 }
658
659 if (!list_empty(&mrt->mfc_unres_queue))
660 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
661
662out:
663 spin_unlock(&mfc_unres_lock);
664}
665
666/* Fill oifs list. It is called under write locked mrt_lock. */
667
668static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
669 unsigned char *ttls)
670{
671 int vifi;
672
673 cache->mfc_un.res.minvif = MAXVIFS;
674 cache->mfc_un.res.maxvif = 0;
675 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
676
677 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
678 if (VIF_EXISTS(mrt, vifi) &&
679 ttls[vifi] && ttls[vifi] < 255) {
680 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
681 if (cache->mfc_un.res.minvif > vifi)
682 cache->mfc_un.res.minvif = vifi;
683 if (cache->mfc_un.res.maxvif <= vifi)
684 cache->mfc_un.res.maxvif = vifi + 1;
685 }
686 }
687}
688
689static int vif_add(struct net *net, struct mr_table *mrt,
690 struct vifctl *vifc, int mrtsock)
691{
692 int vifi = vifc->vifc_vifi;
693 struct vif_device *v = &mrt->vif_table[vifi];
694 struct net_device *dev;
695 struct in_device *in_dev;
696 int err;
697
698 /* Is vif busy ? */
699 if (VIF_EXISTS(mrt, vifi))
700 return -EADDRINUSE;
701
702 switch (vifc->vifc_flags) {
703#ifdef CONFIG_IP_PIMSM
704 case VIFF_REGISTER:
705 /*
706 * Special Purpose VIF in PIM
707 * All the packets will be sent to the daemon
708 */
709 if (mrt->mroute_reg_vif_num >= 0)
710 return -EADDRINUSE;
711 dev = ipmr_reg_vif(net, mrt);
712 if (!dev)
713 return -ENOBUFS;
714 err = dev_set_allmulti(dev, 1);
715 if (err) {
716 unregister_netdevice(dev);
717 dev_put(dev);
718 return err;
719 }
720 break;
721#endif
722 case VIFF_TUNNEL:
723 dev = ipmr_new_tunnel(net, vifc);
724 if (!dev)
725 return -ENOBUFS;
726 err = dev_set_allmulti(dev, 1);
727 if (err) {
728 ipmr_del_tunnel(dev, vifc);
729 dev_put(dev);
730 return err;
731 }
732 break;
733
734 case VIFF_USE_IFINDEX:
735 case 0:
736 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
737 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
738 if (dev && __in_dev_get_rtnl(dev) == NULL) {
739 dev_put(dev);
740 return -EADDRNOTAVAIL;
741 }
742 } else {
743 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
744 }
745 if (!dev)
746 return -EADDRNOTAVAIL;
747 err = dev_set_allmulti(dev, 1);
748 if (err) {
749 dev_put(dev);
750 return err;
751 }
752 break;
753 default:
754 return -EINVAL;
755 }
756
757 in_dev = __in_dev_get_rtnl(dev);
758 if (!in_dev) {
759 dev_put(dev);
760 return -EADDRNOTAVAIL;
761 }
762 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
763 ip_rt_multicast_event(in_dev);
764
765 /* Fill in the VIF structures */
766
767 v->rate_limit = vifc->vifc_rate_limit;
768 v->local = vifc->vifc_lcl_addr.s_addr;
769 v->remote = vifc->vifc_rmt_addr.s_addr;
770 v->flags = vifc->vifc_flags;
771 if (!mrtsock)
772 v->flags |= VIFF_STATIC;
773 v->threshold = vifc->vifc_threshold;
774 v->bytes_in = 0;
775 v->bytes_out = 0;
776 v->pkt_in = 0;
777 v->pkt_out = 0;
778 v->link = dev->ifindex;
779 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
780 v->link = dev->iflink;
781
782 /* And finish update writing critical data */
783 write_lock_bh(&mrt_lock);
784 v->dev = dev;
785#ifdef CONFIG_IP_PIMSM
786 if (v->flags & VIFF_REGISTER)
787 mrt->mroute_reg_vif_num = vifi;
788#endif
789 if (vifi+1 > mrt->maxvif)
790 mrt->maxvif = vifi+1;
791 write_unlock_bh(&mrt_lock);
792 return 0;
793}
794
795/* called with rcu_read_lock() */
796static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
797 __be32 origin,
798 __be32 mcastgrp)
799{
800 int line = MFC_HASH(mcastgrp, origin);
801 struct mfc_cache *c;
802
803 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
804 if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
805 return c;
806 }
807 return NULL;
808}
809
810/*
811 * Allocate a multicast cache entry
812 */
813static struct mfc_cache *ipmr_cache_alloc(void)
814{
815 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
816
817 if (c)
818 c->mfc_un.res.minvif = MAXVIFS;
819 return c;
820}
821
822static struct mfc_cache *ipmr_cache_alloc_unres(void)
823{
824 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
825
826 if (c) {
827 skb_queue_head_init(&c->mfc_un.unres.unresolved);
828 c->mfc_un.unres.expires = jiffies + 10*HZ;
829 }
830 return c;
831}
832
833/*
834 * A cache entry has gone into a resolved state from queued
835 */
836
837static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
838 struct mfc_cache *uc, struct mfc_cache *c)
839{
840 struct sk_buff *skb;
841 struct nlmsgerr *e;
842
843 /* Play the pending entries through our router */
844
845 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
846 if (ip_hdr(skb)->version == 0) {
847 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
848
849 if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
850 nlh->nlmsg_len = skb_tail_pointer(skb) -
851 (u8 *)nlh;
852 } else {
853 nlh->nlmsg_type = NLMSG_ERROR;
854 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
855 skb_trim(skb, nlh->nlmsg_len);
856 e = NLMSG_DATA(nlh);
857 e->error = -EMSGSIZE;
858 memset(&e->msg, 0, sizeof(e->msg));
859 }
860
861 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
862 } else {
863 ip_mr_forward(net, mrt, skb, c, 0);
864 }
865 }
866}
867
868/*
869 * Bounce a cache query up to mrouted. We could use netlink for this but mrouted
870 * expects the following bizarre scheme.
871 *
872 * Called under mrt_lock.
873 */
874
875static int ipmr_cache_report(struct mr_table *mrt,
876 struct sk_buff *pkt, vifi_t vifi, int assert)
877{
878 struct sk_buff *skb;
879 const int ihl = ip_hdrlen(pkt);
880 struct igmphdr *igmp;
881 struct igmpmsg *msg;
882 struct sock *mroute_sk;
883 int ret;
884
885#ifdef CONFIG_IP_PIMSM
886 if (assert == IGMPMSG_WHOLEPKT)
887 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
888 else
889#endif
890 skb = alloc_skb(128, GFP_ATOMIC);
891
892 if (!skb)
893 return -ENOBUFS;
894
895#ifdef CONFIG_IP_PIMSM
896 if (assert == IGMPMSG_WHOLEPKT) {
897 /* Ugly, but we have no choice with this interface.
898 * Duplicate old header, fix ihl, length etc.
899 * And all this only to mangle msg->im_msgtype and
900 * to set msg->im_mbz to "mbz" :-)
901 */
902 skb_push(skb, sizeof(struct iphdr));
903 skb_reset_network_header(skb);
904 skb_reset_transport_header(skb);
905 msg = (struct igmpmsg *)skb_network_header(skb);
906 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
907 msg->im_msgtype = IGMPMSG_WHOLEPKT;
908 msg->im_mbz = 0;
909 msg->im_vif = mrt->mroute_reg_vif_num;
910 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
911 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
912 sizeof(struct iphdr));
913 } else
914#endif
915 {
916
917 /* Copy the IP header */
918
919 skb->network_header = skb->tail;
920 skb_put(skb, ihl);
921 skb_copy_to_linear_data(skb, pkt->data, ihl);
922 ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */
923 msg = (struct igmpmsg *)skb_network_header(skb);
924 msg->im_vif = vifi;
925 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
926
927 /* Add our header */
928
929 igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
930 igmp->type =
931 msg->im_msgtype = assert;
932 igmp->code = 0;
933 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */
934 skb->transport_header = skb->network_header;
935 }
936
937 rcu_read_lock();
938 mroute_sk = rcu_dereference(mrt->mroute_sk);
939 if (mroute_sk == NULL) {
940 rcu_read_unlock();
941 kfree_skb(skb);
942 return -EINVAL;
943 }
944
945 /* Deliver to mrouted */
946
947 ret = sock_queue_rcv_skb(mroute_sk, skb);
948 rcu_read_unlock();
949 if (ret < 0) {
950 if (net_ratelimit())
951 printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n");
952 kfree_skb(skb);
953 }
954
955 return ret;
956}
957
958/*
959 * Queue a packet for resolution. It gets locked cache entry!
960 */
961
962static int
963ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
964{
965 bool found = false;
966 int err;
967 struct mfc_cache *c;
968 const struct iphdr *iph = ip_hdr(skb);
969
970 spin_lock_bh(&mfc_unres_lock);
971 list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
972 if (c->mfc_mcastgrp == iph->daddr &&
973 c->mfc_origin == iph->saddr) {
974 found = true;
975 break;
976 }
977 }
978
979 if (!found) {
980 /* Create a new entry if allowable */
981
982 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
983 (c = ipmr_cache_alloc_unres()) == NULL) {
984 spin_unlock_bh(&mfc_unres_lock);
985
986 kfree_skb(skb);
987 return -ENOBUFS;
988 }
989
990 /* Fill in the new cache entry */
991
992 c->mfc_parent = -1;
993 c->mfc_origin = iph->saddr;
994 c->mfc_mcastgrp = iph->daddr;
995
996 /* Reflect first query at mrouted. */
997
998 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
999 if (err < 0) {
1000 /* If the report failed throw the cache entry
1001 out - Brad Parker
1002 */
1003 spin_unlock_bh(&mfc_unres_lock);
1004
1005 ipmr_cache_free(c);
1006 kfree_skb(skb);
1007 return err;
1008 }
1009
1010 atomic_inc(&mrt->cache_resolve_queue_len);
1011 list_add(&c->list, &mrt->mfc_unres_queue);
1012
1013 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1014 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
1015 }
1016
1017 /* See if we can append the packet */
1018
1019 if (c->mfc_un.unres.unresolved.qlen > 3) {
1020 kfree_skb(skb);
1021 err = -ENOBUFS;
1022 } else {
1023 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1024 err = 0;
1025 }
1026
1027 spin_unlock_bh(&mfc_unres_lock);
1028 return err;
1029}
1030
1031/*
1032 * MFC cache manipulation by user space mroute daemon
1033 */
1034
1035static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc)
1036{
1037 int line;
1038 struct mfc_cache *c, *next;
1039
1040 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1041
1042 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
1043 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1044 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
1045 list_del_rcu(&c->list);
1046
1047 ipmr_cache_free(c);
1048 return 0;
1049 }
1050 }
1051 return -ENOENT;
1052}
1053
1054static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1055 struct mfcctl *mfc, int mrtsock)
1056{
1057 bool found = false;
1058 int line;
1059 struct mfc_cache *uc, *c;
1060
1061 if (mfc->mfcc_parent >= MAXVIFS)
1062 return -ENFILE;
1063
1064 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1065
1066 list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
1067 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1068 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
1069 found = true;
1070 break;
1071 }
1072 }
1073
1074 if (found) {
1075 write_lock_bh(&mrt_lock);
1076 c->mfc_parent = mfc->mfcc_parent;
1077 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1078 if (!mrtsock)
1079 c->mfc_flags |= MFC_STATIC;
1080 write_unlock_bh(&mrt_lock);
1081 return 0;
1082 }
1083
1084 if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1085 return -EINVAL;
1086
1087 c = ipmr_cache_alloc();
1088 if (c == NULL)
1089 return -ENOMEM;
1090
1091 c->mfc_origin = mfc->mfcc_origin.s_addr;
1092 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
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
1098 list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
1099
1100 /*
1101 * Check to see if we resolved a queued list. If so we
1102 * need to send on the frames and tidy up.
1103 */
1104 found = false;
1105 spin_lock_bh(&mfc_unres_lock);
1106 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
1107 if (uc->mfc_origin == c->mfc_origin &&
1108 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1109 list_del(&uc->list);
1110 atomic_dec(&mrt->cache_resolve_queue_len);
1111 found = true;
1112 break;
1113 }
1114 }
1115 if (list_empty(&mrt->mfc_unres_queue))
1116 del_timer(&mrt->ipmr_expire_timer);
1117 spin_unlock_bh(&mfc_unres_lock);
1118
1119 if (found) {
1120 ipmr_cache_resolve(net, mrt, uc, c);
1121 ipmr_cache_free(uc);
1122 }
1123 return 0;
1124}
1125
1126/*
1127 * Close the multicast socket, and clear the vif tables etc
1128 */
1129
1130static void mroute_clean_tables(struct mr_table *mrt)
1131{
1132 int i;
1133 LIST_HEAD(list);
1134 struct mfc_cache *c, *next;
1135
1136 /* Shut down all active vif entries */
1137
1138 for (i = 0; i < mrt->maxvif; i++) {
1139 if (!(mrt->vif_table[i].flags & VIFF_STATIC))
1140 vif_delete(mrt, i, 0, &list);
1141 }
1142 unregister_netdevice_many(&list);
1143
1144 /* Wipe the cache */
1145
1146 for (i = 0; i < MFC_LINES; i++) {
1147 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
1148 if (c->mfc_flags & MFC_STATIC)
1149 continue;
1150 list_del_rcu(&c->list);
1151 ipmr_cache_free(c);
1152 }
1153 }
1154
1155 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1156 spin_lock_bh(&mfc_unres_lock);
1157 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1158 list_del(&c->list);
1159 ipmr_destroy_unres(mrt, c);
1160 }
1161 spin_unlock_bh(&mfc_unres_lock);
1162 }
1163}
1164
1165/* called from ip_ra_control(), before an RCU grace period,
1166 * we dont need to call synchronize_rcu() here
1167 */
1168static void mrtsock_destruct(struct sock *sk)
1169{
1170 struct net *net = sock_net(sk);
1171 struct mr_table *mrt;
1172
1173 rtnl_lock();
1174 ipmr_for_each_table(mrt, net) {
1175 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1176 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1177 rcu_assign_pointer(mrt->mroute_sk, NULL);
1178 mroute_clean_tables(mrt);
1179 }
1180 }
1181 rtnl_unlock();
1182}
1183
1184/*
1185 * Socket options and virtual interface manipulation. The whole
1186 * virtual interface system is a complete heap, but unfortunately
1187 * that's how BSD mrouted happens to think. Maybe one day with a proper
1188 * MOSPF/PIM router set up we can clean this up.
1189 */
1190
1191int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1192{
1193 int ret;
1194 struct vifctl vif;
1195 struct mfcctl mfc;
1196 struct net *net = sock_net(sk);
1197 struct mr_table *mrt;
1198
1199 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1200 if (mrt == NULL)
1201 return -ENOENT;
1202
1203 if (optname != MRT_INIT) {
1204 if (sk != rcu_dereference_raw(mrt->mroute_sk) &&
1205 !capable(CAP_NET_ADMIN))
1206 return -EACCES;
1207 }
1208
1209 switch (optname) {
1210 case MRT_INIT:
1211 if (sk->sk_type != SOCK_RAW ||
1212 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1213 return -EOPNOTSUPP;
1214 if (optlen != sizeof(int))
1215 return -ENOPROTOOPT;
1216
1217 rtnl_lock();
1218 if (rtnl_dereference(mrt->mroute_sk)) {
1219 rtnl_unlock();
1220 return -EADDRINUSE;
1221 }
1222
1223 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1224 if (ret == 0) {
1225 rcu_assign_pointer(mrt->mroute_sk, sk);
1226 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1227 }
1228 rtnl_unlock();
1229 return ret;
1230 case MRT_DONE:
1231 if (sk != rcu_dereference_raw(mrt->mroute_sk))
1232 return -EACCES;
1233 return ip_ra_control(sk, 0, NULL);
1234 case MRT_ADD_VIF:
1235 case MRT_DEL_VIF:
1236 if (optlen != sizeof(vif))
1237 return -EINVAL;
1238 if (copy_from_user(&vif, optval, sizeof(vif)))
1239 return -EFAULT;
1240 if (vif.vifc_vifi >= MAXVIFS)
1241 return -ENFILE;
1242 rtnl_lock();
1243 if (optname == MRT_ADD_VIF) {
1244 ret = vif_add(net, mrt, &vif,
1245 sk == rtnl_dereference(mrt->mroute_sk));
1246 } else {
1247 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1248 }
1249 rtnl_unlock();
1250 return ret;
1251
1252 /*
1253 * Manipulate the forwarding caches. These live
1254 * in a sort of kernel/user symbiosis.
1255 */
1256 case MRT_ADD_MFC:
1257 case MRT_DEL_MFC:
1258 if (optlen != sizeof(mfc))
1259 return -EINVAL;
1260 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1261 return -EFAULT;
1262 rtnl_lock();
1263 if (optname == MRT_DEL_MFC)
1264 ret = ipmr_mfc_delete(mrt, &mfc);
1265 else
1266 ret = ipmr_mfc_add(net, mrt, &mfc,
1267 sk == rtnl_dereference(mrt->mroute_sk));
1268 rtnl_unlock();
1269 return ret;
1270 /*
1271 * Control PIM assert.
1272 */
1273 case MRT_ASSERT:
1274 {
1275 int v;
1276 if (get_user(v, (int __user *)optval))
1277 return -EFAULT;
1278 mrt->mroute_do_assert = (v) ? 1 : 0;
1279 return 0;
1280 }
1281#ifdef CONFIG_IP_PIMSM
1282 case MRT_PIM:
1283 {
1284 int v;
1285
1286 if (get_user(v, (int __user *)optval))
1287 return -EFAULT;
1288 v = (v) ? 1 : 0;
1289
1290 rtnl_lock();
1291 ret = 0;
1292 if (v != mrt->mroute_do_pim) {
1293 mrt->mroute_do_pim = v;
1294 mrt->mroute_do_assert = v;
1295 }
1296 rtnl_unlock();
1297 return ret;
1298 }
1299#endif
1300#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
1301 case MRT_TABLE:
1302 {
1303 u32 v;
1304
1305 if (optlen != sizeof(u32))
1306 return -EINVAL;
1307 if (get_user(v, (u32 __user *)optval))
1308 return -EFAULT;
1309
1310 rtnl_lock();
1311 ret = 0;
1312 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1313 ret = -EBUSY;
1314 } else {
1315 if (!ipmr_new_table(net, v))
1316 ret = -ENOMEM;
1317 raw_sk(sk)->ipmr_table = v;
1318 }
1319 rtnl_unlock();
1320 return ret;
1321 }
1322#endif
1323 /*
1324 * Spurious command, or MRT_VERSION which you cannot
1325 * set.
1326 */
1327 default:
1328 return -ENOPROTOOPT;
1329 }
1330}
1331
1332/*
1333 * Getsock opt support for the multicast routing system.
1334 */
1335
1336int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1337{
1338 int olr;
1339 int val;
1340 struct net *net = sock_net(sk);
1341 struct mr_table *mrt;
1342
1343 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1344 if (mrt == NULL)
1345 return -ENOENT;
1346
1347 if (optname != MRT_VERSION &&
1348#ifdef CONFIG_IP_PIMSM
1349 optname != MRT_PIM &&
1350#endif
1351 optname != MRT_ASSERT)
1352 return -ENOPROTOOPT;
1353
1354 if (get_user(olr, optlen))
1355 return -EFAULT;
1356
1357 olr = min_t(unsigned int, olr, sizeof(int));
1358 if (olr < 0)
1359 return -EINVAL;
1360
1361 if (put_user(olr, optlen))
1362 return -EFAULT;
1363 if (optname == MRT_VERSION)
1364 val = 0x0305;
1365#ifdef CONFIG_IP_PIMSM
1366 else if (optname == MRT_PIM)
1367 val = mrt->mroute_do_pim;
1368#endif
1369 else
1370 val = mrt->mroute_do_assert;
1371 if (copy_to_user(optval, &val, olr))
1372 return -EFAULT;
1373 return 0;
1374}
1375
1376/*
1377 * The IP multicast ioctl support routines.
1378 */
1379
1380int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1381{
1382 struct sioc_sg_req sr;
1383 struct sioc_vif_req vr;
1384 struct vif_device *vif;
1385 struct mfc_cache *c;
1386 struct net *net = sock_net(sk);
1387 struct mr_table *mrt;
1388
1389 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1390 if (mrt == NULL)
1391 return -ENOENT;
1392
1393 switch (cmd) {
1394 case SIOCGETVIFCNT:
1395 if (copy_from_user(&vr, arg, sizeof(vr)))
1396 return -EFAULT;
1397 if (vr.vifi >= mrt->maxvif)
1398 return -EINVAL;
1399 read_lock(&mrt_lock);
1400 vif = &mrt->vif_table[vr.vifi];
1401 if (VIF_EXISTS(mrt, vr.vifi)) {
1402 vr.icount = vif->pkt_in;
1403 vr.ocount = vif->pkt_out;
1404 vr.ibytes = vif->bytes_in;
1405 vr.obytes = vif->bytes_out;
1406 read_unlock(&mrt_lock);
1407
1408 if (copy_to_user(arg, &vr, sizeof(vr)))
1409 return -EFAULT;
1410 return 0;
1411 }
1412 read_unlock(&mrt_lock);
1413 return -EADDRNOTAVAIL;
1414 case SIOCGETSGCNT:
1415 if (copy_from_user(&sr, arg, sizeof(sr)))
1416 return -EFAULT;
1417
1418 rcu_read_lock();
1419 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1420 if (c) {
1421 sr.pktcnt = c->mfc_un.res.pkt;
1422 sr.bytecnt = c->mfc_un.res.bytes;
1423 sr.wrong_if = c->mfc_un.res.wrong_if;
1424 rcu_read_unlock();
1425
1426 if (copy_to_user(arg, &sr, sizeof(sr)))
1427 return -EFAULT;
1428 return 0;
1429 }
1430 rcu_read_unlock();
1431 return -EADDRNOTAVAIL;
1432 default:
1433 return -ENOIOCTLCMD;
1434 }
1435}
1436
1437
1438static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1439{
1440 struct net_device *dev = ptr;
1441 struct net *net = dev_net(dev);
1442 struct mr_table *mrt;
1443 struct vif_device *v;
1444 int ct;
1445 LIST_HEAD(list);
1446
1447 if (event != NETDEV_UNREGISTER)
1448 return NOTIFY_DONE;
1449
1450 ipmr_for_each_table(mrt, net) {
1451 v = &mrt->vif_table[0];
1452 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1453 if (v->dev == dev)
1454 vif_delete(mrt, ct, 1, &list);
1455 }
1456 }
1457 unregister_netdevice_many(&list);
1458 return NOTIFY_DONE;
1459}
1460
1461
1462static struct notifier_block ip_mr_notifier = {
1463 .notifier_call = ipmr_device_event,
1464};
1465
1466/*
1467 * Encapsulate a packet by attaching a valid IPIP header to it.
1468 * This avoids tunnel drivers and other mess and gives us the speed so
1469 * important for multicast video.
1470 */
1471
1472static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
1473{
1474 struct iphdr *iph;
1475 struct iphdr *old_iph = ip_hdr(skb);
1476
1477 skb_push(skb, sizeof(struct iphdr));
1478 skb->transport_header = skb->network_header;
1479 skb_reset_network_header(skb);
1480 iph = ip_hdr(skb);
1481
1482 iph->version = 4;
1483 iph->tos = old_iph->tos;
1484 iph->ttl = old_iph->ttl;
1485 iph->frag_off = 0;
1486 iph->daddr = daddr;
1487 iph->saddr = saddr;
1488 iph->protocol = IPPROTO_IPIP;
1489 iph->ihl = 5;
1490 iph->tot_len = htons(skb->len);
1491 ip_select_ident(iph, skb_dst(skb), NULL);
1492 ip_send_check(iph);
1493
1494 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1495 nf_reset(skb);
1496}
1497
1498static inline int ipmr_forward_finish(struct sk_buff *skb)
1499{
1500 struct ip_options *opt = &(IPCB(skb)->opt);
1501
1502 IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS);
1503
1504 if (unlikely(opt->optlen))
1505 ip_forward_options(skb);
1506
1507 return dst_output(skb);
1508}
1509
1510/*
1511 * Processing handlers for ipmr_forward
1512 */
1513
1514static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1515 struct sk_buff *skb, struct mfc_cache *c, int vifi)
1516{
1517 const struct iphdr *iph = ip_hdr(skb);
1518 struct vif_device *vif = &mrt->vif_table[vifi];
1519 struct net_device *dev;
1520 struct rtable *rt;
1521 int encap = 0;
1522
1523 if (vif->dev == NULL)
1524 goto out_free;
1525
1526#ifdef CONFIG_IP_PIMSM
1527 if (vif->flags & VIFF_REGISTER) {
1528 vif->pkt_out++;
1529 vif->bytes_out += skb->len;
1530 vif->dev->stats.tx_bytes += skb->len;
1531 vif->dev->stats.tx_packets++;
1532 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1533 goto out_free;
1534 }
1535#endif
1536
1537 if (vif->flags & VIFF_TUNNEL) {
1538 struct flowi fl = {
1539 .oif = vif->link,
1540 .fl4_dst = vif->remote,
1541 .fl4_src = vif->local,
1542 .fl4_tos = RT_TOS(iph->tos),
1543 .proto = IPPROTO_IPIP
1544 };
1545
1546 if (ip_route_output_key(net, &rt, &fl))
1547 goto out_free;
1548 encap = sizeof(struct iphdr);
1549 } else {
1550 struct flowi fl = {
1551 .oif = vif->link,
1552 .fl4_dst = iph->daddr,
1553 .fl4_tos = RT_TOS(iph->tos),
1554 .proto = IPPROTO_IPIP
1555 };
1556
1557 if (ip_route_output_key(net, &rt, &fl))
1558 goto out_free;
1559 }
1560
1561 dev = rt->dst.dev;
1562
1563 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1564 /* Do not fragment multicasts. Alas, IPv4 does not
1565 * allow to send ICMP, so that packets will disappear
1566 * to blackhole.
1567 */
1568
1569 IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
1570 ip_rt_put(rt);
1571 goto out_free;
1572 }
1573
1574 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1575
1576 if (skb_cow(skb, encap)) {
1577 ip_rt_put(rt);
1578 goto out_free;
1579 }
1580
1581 vif->pkt_out++;
1582 vif->bytes_out += skb->len;
1583
1584 skb_dst_drop(skb);
1585 skb_dst_set(skb, &rt->dst);
1586 ip_decrease_ttl(ip_hdr(skb));
1587
1588 /* FIXME: forward and output firewalls used to be called here.
1589 * What do we do with netfilter? -- RR
1590 */
1591 if (vif->flags & VIFF_TUNNEL) {
1592 ip_encap(skb, vif->local, vif->remote);
1593 /* FIXME: extra output firewall step used to be here. --RR */
1594 vif->dev->stats.tx_packets++;
1595 vif->dev->stats.tx_bytes += skb->len;
1596 }
1597
1598 IPCB(skb)->flags |= IPSKB_FORWARDED;
1599
1600 /*
1601 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1602 * not only before forwarding, but after forwarding on all output
1603 * interfaces. It is clear, if mrouter runs a multicasting
1604 * program, it should receive packets not depending to what interface
1605 * program is joined.
1606 * If we will not make it, the program will have to join on all
1607 * interfaces. On the other hand, multihoming host (or router, but
1608 * not mrouter) cannot join to more than one interface - it will
1609 * result in receiving multiple packets.
1610 */
1611 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev,
1612 ipmr_forward_finish);
1613 return;
1614
1615out_free:
1616 kfree_skb(skb);
1617}
1618
1619static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1620{
1621 int ct;
1622
1623 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1624 if (mrt->vif_table[ct].dev == dev)
1625 break;
1626 }
1627 return ct;
1628}
1629
1630/* "local" means that we should preserve one skb (for local delivery) */
1631
1632static int ip_mr_forward(struct net *net, struct mr_table *mrt,
1633 struct sk_buff *skb, struct mfc_cache *cache,
1634 int local)
1635{
1636 int psend = -1;
1637 int vif, ct;
1638
1639 vif = cache->mfc_parent;
1640 cache->mfc_un.res.pkt++;
1641 cache->mfc_un.res.bytes += skb->len;
1642
1643 /*
1644 * Wrong interface: drop packet and (maybe) send PIM assert.
1645 */
1646 if (mrt->vif_table[vif].dev != skb->dev) {
1647 int true_vifi;
1648
1649 if (rt_is_output_route(skb_rtable(skb))) {
1650 /* It is our own packet, looped back.
1651 * Very complicated situation...
1652 *
1653 * The best workaround until routing daemons will be
1654 * fixed is not to redistribute packet, if it was
1655 * send through wrong interface. It means, that
1656 * multicast applications WILL NOT work for
1657 * (S,G), which have default multicast route pointing
1658 * to wrong oif. In any case, it is not a good
1659 * idea to use multicasting applications on router.
1660 */
1661 goto dont_forward;
1662 }
1663
1664 cache->mfc_un.res.wrong_if++;
1665 true_vifi = ipmr_find_vif(mrt, skb->dev);
1666
1667 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1668 /* pimsm uses asserts, when switching from RPT to SPT,
1669 * so that we cannot check that packet arrived on an oif.
1670 * It is bad, but otherwise we would need to move pretty
1671 * large chunk of pimd to kernel. Ough... --ANK
1672 */
1673 (mrt->mroute_do_pim ||
1674 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1675 time_after(jiffies,
1676 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1677 cache->mfc_un.res.last_assert = jiffies;
1678 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1679 }
1680 goto dont_forward;
1681 }
1682
1683 mrt->vif_table[vif].pkt_in++;
1684 mrt->vif_table[vif].bytes_in += skb->len;
1685
1686 /*
1687 * Forward the frame
1688 */
1689 for (ct = cache->mfc_un.res.maxvif - 1;
1690 ct >= cache->mfc_un.res.minvif; ct--) {
1691 if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
1692 if (psend != -1) {
1693 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1694
1695 if (skb2)
1696 ipmr_queue_xmit(net, mrt, skb2, cache,
1697 psend);
1698 }
1699 psend = ct;
1700 }
1701 }
1702 if (psend != -1) {
1703 if (local) {
1704 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1705
1706 if (skb2)
1707 ipmr_queue_xmit(net, mrt, skb2, cache, psend);
1708 } else {
1709 ipmr_queue_xmit(net, mrt, skb, cache, psend);
1710 return 0;
1711 }
1712 }
1713
1714dont_forward:
1715 if (!local)
1716 kfree_skb(skb);
1717 return 0;
1718}
1719
1720
1721/*
1722 * Multicast packets for forwarding arrive here
1723 * Called with rcu_read_lock();
1724 */
1725
1726int ip_mr_input(struct sk_buff *skb)
1727{
1728 struct mfc_cache *cache;
1729 struct net *net = dev_net(skb->dev);
1730 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
1731 struct mr_table *mrt;
1732 int err;
1733
1734 /* Packet is looped back after forward, it should not be
1735 * forwarded second time, but still can be delivered locally.
1736 */
1737 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1738 goto dont_forward;
1739
1740 err = ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt);
1741 if (err < 0) {
1742 kfree_skb(skb);
1743 return err;
1744 }
1745
1746 if (!local) {
1747 if (IPCB(skb)->opt.router_alert) {
1748 if (ip_call_ra_chain(skb))
1749 return 0;
1750 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
1751 /* IGMPv1 (and broken IGMPv2 implementations sort of
1752 * Cisco IOS <= 11.2(8)) do not put router alert
1753 * option to IGMP packets destined to routable
1754 * groups. It is very bad, because it means
1755 * that we can forward NO IGMP messages.
1756 */
1757 struct sock *mroute_sk;
1758
1759 mroute_sk = rcu_dereference(mrt->mroute_sk);
1760 if (mroute_sk) {
1761 nf_reset(skb);
1762 raw_rcv(mroute_sk, skb);
1763 return 0;
1764 }
1765 }
1766 }
1767
1768 /* already under rcu_read_lock() */
1769 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
1770
1771 /*
1772 * No usable cache entry
1773 */
1774 if (cache == NULL) {
1775 int vif;
1776
1777 if (local) {
1778 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1779 ip_local_deliver(skb);
1780 if (skb2 == NULL)
1781 return -ENOBUFS;
1782 skb = skb2;
1783 }
1784
1785 read_lock(&mrt_lock);
1786 vif = ipmr_find_vif(mrt, skb->dev);
1787 if (vif >= 0) {
1788 int err2 = ipmr_cache_unresolved(mrt, vif, skb);
1789 read_unlock(&mrt_lock);
1790
1791 return err2;
1792 }
1793 read_unlock(&mrt_lock);
1794 kfree_skb(skb);
1795 return -ENODEV;
1796 }
1797
1798 read_lock(&mrt_lock);
1799 ip_mr_forward(net, mrt, skb, cache, local);
1800 read_unlock(&mrt_lock);
1801
1802 if (local)
1803 return ip_local_deliver(skb);
1804
1805 return 0;
1806
1807dont_forward:
1808 if (local)
1809 return ip_local_deliver(skb);
1810 kfree_skb(skb);
1811 return 0;
1812}
1813
1814#ifdef CONFIG_IP_PIMSM
1815/* called with rcu_read_lock() */
1816static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
1817 unsigned int pimlen)
1818{
1819 struct net_device *reg_dev = NULL;
1820 struct iphdr *encap;
1821
1822 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
1823 /*
1824 * Check that:
1825 * a. packet is really sent to a multicast group
1826 * b. packet is not a NULL-REGISTER
1827 * c. packet is not truncated
1828 */
1829 if (!ipv4_is_multicast(encap->daddr) ||
1830 encap->tot_len == 0 ||
1831 ntohs(encap->tot_len) + pimlen > skb->len)
1832 return 1;
1833
1834 read_lock(&mrt_lock);
1835 if (mrt->mroute_reg_vif_num >= 0)
1836 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
1837 read_unlock(&mrt_lock);
1838
1839 if (reg_dev == NULL)
1840 return 1;
1841
1842 skb->mac_header = skb->network_header;
1843 skb_pull(skb, (u8 *)encap - skb->data);
1844 skb_reset_network_header(skb);
1845 skb->protocol = htons(ETH_P_IP);
1846 skb->ip_summed = CHECKSUM_NONE;
1847 skb->pkt_type = PACKET_HOST;
1848
1849 skb_tunnel_rx(skb, reg_dev);
1850
1851 netif_rx(skb);
1852
1853 return NET_RX_SUCCESS;
1854}
1855#endif
1856
1857#ifdef CONFIG_IP_PIMSM_V1
1858/*
1859 * Handle IGMP messages of PIMv1
1860 */
1861
1862int pim_rcv_v1(struct sk_buff *skb)
1863{
1864 struct igmphdr *pim;
1865 struct net *net = dev_net(skb->dev);
1866 struct mr_table *mrt;
1867
1868 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1869 goto drop;
1870
1871 pim = igmp_hdr(skb);
1872
1873 if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0)
1874 goto drop;
1875
1876 if (!mrt->mroute_do_pim ||
1877 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
1878 goto drop;
1879
1880 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
1881drop:
1882 kfree_skb(skb);
1883 }
1884 return 0;
1885}
1886#endif
1887
1888#ifdef CONFIG_IP_PIMSM_V2
1889static int pim_rcv(struct sk_buff *skb)
1890{
1891 struct pimreghdr *pim;
1892 struct net *net = dev_net(skb->dev);
1893 struct mr_table *mrt;
1894
1895 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1896 goto drop;
1897
1898 pim = (struct pimreghdr *)skb_transport_header(skb);
1899 if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
1900 (pim->flags & PIM_NULL_REGISTER) ||
1901 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
1902 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
1903 goto drop;
1904
1905 if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0)
1906 goto drop;
1907
1908 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
1909drop:
1910 kfree_skb(skb);
1911 }
1912 return 0;
1913}
1914#endif
1915
1916static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
1917 struct mfc_cache *c, struct rtmsg *rtm)
1918{
1919 int ct;
1920 struct rtnexthop *nhp;
1921 u8 *b = skb_tail_pointer(skb);
1922 struct rtattr *mp_head;
1923
1924 /* If cache is unresolved, don't try to parse IIF and OIF */
1925 if (c->mfc_parent >= MAXVIFS)
1926 return -ENOENT;
1927
1928 if (VIF_EXISTS(mrt, c->mfc_parent))
1929 RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex);
1930
1931 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
1932
1933 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
1934 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
1935 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
1936 goto rtattr_failure;
1937 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
1938 nhp->rtnh_flags = 0;
1939 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
1940 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
1941 nhp->rtnh_len = sizeof(*nhp);
1942 }
1943 }
1944 mp_head->rta_type = RTA_MULTIPATH;
1945 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
1946 rtm->rtm_type = RTN_MULTICAST;
1947 return 1;
1948
1949rtattr_failure:
1950 nlmsg_trim(skb, b);
1951 return -EMSGSIZE;
1952}
1953
1954int ipmr_get_route(struct net *net,
1955 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
1956{
1957 int err;
1958 struct mr_table *mrt;
1959 struct mfc_cache *cache;
1960 struct rtable *rt = skb_rtable(skb);
1961
1962 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
1963 if (mrt == NULL)
1964 return -ENOENT;
1965
1966 rcu_read_lock();
1967 cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst);
1968
1969 if (cache == NULL) {
1970 struct sk_buff *skb2;
1971 struct iphdr *iph;
1972 struct net_device *dev;
1973 int vif = -1;
1974
1975 if (nowait) {
1976 rcu_read_unlock();
1977 return -EAGAIN;
1978 }
1979
1980 dev = skb->dev;
1981 read_lock(&mrt_lock);
1982 if (dev)
1983 vif = ipmr_find_vif(mrt, dev);
1984 if (vif < 0) {
1985 read_unlock(&mrt_lock);
1986 rcu_read_unlock();
1987 return -ENODEV;
1988 }
1989 skb2 = skb_clone(skb, GFP_ATOMIC);
1990 if (!skb2) {
1991 read_unlock(&mrt_lock);
1992 rcu_read_unlock();
1993 return -ENOMEM;
1994 }
1995
1996 skb_push(skb2, sizeof(struct iphdr));
1997 skb_reset_network_header(skb2);
1998 iph = ip_hdr(skb2);
1999 iph->ihl = sizeof(struct iphdr) >> 2;
2000 iph->saddr = rt->rt_src;
2001 iph->daddr = rt->rt_dst;
2002 iph->version = 0;
2003 err = ipmr_cache_unresolved(mrt, vif, skb2);
2004 read_unlock(&mrt_lock);
2005 rcu_read_unlock();
2006 return err;
2007 }
2008
2009 read_lock(&mrt_lock);
2010 if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY))
2011 cache->mfc_flags |= MFC_NOTIFY;
2012 err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
2013 read_unlock(&mrt_lock);
2014 rcu_read_unlock();
2015 return err;
2016}
2017
2018static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2019 u32 pid, u32 seq, struct mfc_cache *c)
2020{
2021 struct nlmsghdr *nlh;
2022 struct rtmsg *rtm;
2023
2024 nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI);
2025 if (nlh == NULL)
2026 return -EMSGSIZE;
2027
2028 rtm = nlmsg_data(nlh);
2029 rtm->rtm_family = RTNL_FAMILY_IPMR;
2030 rtm->rtm_dst_len = 32;
2031 rtm->rtm_src_len = 32;
2032 rtm->rtm_tos = 0;
2033 rtm->rtm_table = mrt->id;
2034 NLA_PUT_U32(skb, RTA_TABLE, mrt->id);
2035 rtm->rtm_type = RTN_MULTICAST;
2036 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2037 rtm->rtm_protocol = RTPROT_UNSPEC;
2038 rtm->rtm_flags = 0;
2039
2040 NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin);
2041 NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp);
2042
2043 if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0)
2044 goto nla_put_failure;
2045
2046 return nlmsg_end(skb, nlh);
2047
2048nla_put_failure:
2049 nlmsg_cancel(skb, nlh);
2050 return -EMSGSIZE;
2051}
2052
2053static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2054{
2055 struct net *net = sock_net(skb->sk);
2056 struct mr_table *mrt;
2057 struct mfc_cache *mfc;
2058 unsigned int t = 0, s_t;
2059 unsigned int h = 0, s_h;
2060 unsigned int e = 0, s_e;
2061
2062 s_t = cb->args[0];
2063 s_h = cb->args[1];
2064 s_e = cb->args[2];
2065
2066 rcu_read_lock();
2067 ipmr_for_each_table(mrt, net) {
2068 if (t < s_t)
2069 goto next_table;
2070 if (t > s_t)
2071 s_h = 0;
2072 for (h = s_h; h < MFC_LINES; h++) {
2073 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
2074 if (e < s_e)
2075 goto next_entry;
2076 if (ipmr_fill_mroute(mrt, skb,
2077 NETLINK_CB(cb->skb).pid,
2078 cb->nlh->nlmsg_seq,
2079 mfc) < 0)
2080 goto done;
2081next_entry:
2082 e++;
2083 }
2084 e = s_e = 0;
2085 }
2086 s_h = 0;
2087next_table:
2088 t++;
2089 }
2090done:
2091 rcu_read_unlock();
2092
2093 cb->args[2] = e;
2094 cb->args[1] = h;
2095 cb->args[0] = t;
2096
2097 return skb->len;
2098}
2099
2100#ifdef CONFIG_PROC_FS
2101/*
2102 * The /proc interfaces to multicast routing :
2103 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif
2104 */
2105struct ipmr_vif_iter {
2106 struct seq_net_private p;
2107 struct mr_table *mrt;
2108 int ct;
2109};
2110
2111static struct vif_device *ipmr_vif_seq_idx(struct net *net,
2112 struct ipmr_vif_iter *iter,
2113 loff_t pos)
2114{
2115 struct mr_table *mrt = iter->mrt;
2116
2117 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
2118 if (!VIF_EXISTS(mrt, iter->ct))
2119 continue;
2120 if (pos-- == 0)
2121 return &mrt->vif_table[iter->ct];
2122 }
2123 return NULL;
2124}
2125
2126static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2127 __acquires(mrt_lock)
2128{
2129 struct ipmr_vif_iter *iter = seq->private;
2130 struct net *net = seq_file_net(seq);
2131 struct mr_table *mrt;
2132
2133 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2134 if (mrt == NULL)
2135 return ERR_PTR(-ENOENT);
2136
2137 iter->mrt = mrt;
2138
2139 read_lock(&mrt_lock);
2140 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
2141 : SEQ_START_TOKEN;
2142}
2143
2144static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2145{
2146 struct ipmr_vif_iter *iter = seq->private;
2147 struct net *net = seq_file_net(seq);
2148 struct mr_table *mrt = iter->mrt;
2149
2150 ++*pos;
2151 if (v == SEQ_START_TOKEN)
2152 return ipmr_vif_seq_idx(net, iter, 0);
2153
2154 while (++iter->ct < mrt->maxvif) {
2155 if (!VIF_EXISTS(mrt, iter->ct))
2156 continue;
2157 return &mrt->vif_table[iter->ct];
2158 }
2159 return NULL;
2160}
2161
2162static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2163 __releases(mrt_lock)
2164{
2165 read_unlock(&mrt_lock);
2166}
2167
2168static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2169{
2170 struct ipmr_vif_iter *iter = seq->private;
2171 struct mr_table *mrt = iter->mrt;
2172
2173 if (v == SEQ_START_TOKEN) {
2174 seq_puts(seq,
2175 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2176 } else {
2177 const struct vif_device *vif = v;
2178 const char *name = vif->dev ? vif->dev->name : "none";
2179
2180 seq_printf(seq,
2181 "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2182 vif - mrt->vif_table,
2183 name, vif->bytes_in, vif->pkt_in,
2184 vif->bytes_out, vif->pkt_out,
2185 vif->flags, vif->local, vif->remote);
2186 }
2187 return 0;
2188}
2189
2190static const struct seq_operations ipmr_vif_seq_ops = {
2191 .start = ipmr_vif_seq_start,
2192 .next = ipmr_vif_seq_next,
2193 .stop = ipmr_vif_seq_stop,
2194 .show = ipmr_vif_seq_show,
2195};
2196
2197static int ipmr_vif_open(struct inode *inode, struct file *file)
2198{
2199 return seq_open_net(inode, file, &ipmr_vif_seq_ops,
2200 sizeof(struct ipmr_vif_iter));
2201}
2202
2203static const struct file_operations ipmr_vif_fops = {
2204 .owner = THIS_MODULE,
2205 .open = ipmr_vif_open,
2206 .read = seq_read,
2207 .llseek = seq_lseek,
2208 .release = seq_release_net,
2209};
2210
2211struct ipmr_mfc_iter {
2212 struct seq_net_private p;
2213 struct mr_table *mrt;
2214 struct list_head *cache;
2215 int ct;
2216};
2217
2218
2219static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
2220 struct ipmr_mfc_iter *it, loff_t pos)
2221{
2222 struct mr_table *mrt = it->mrt;
2223 struct mfc_cache *mfc;
2224
2225 rcu_read_lock();
2226 for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
2227 it->cache = &mrt->mfc_cache_array[it->ct];
2228 list_for_each_entry_rcu(mfc, it->cache, list)
2229 if (pos-- == 0)
2230 return mfc;
2231 }
2232 rcu_read_unlock();
2233
2234 spin_lock_bh(&mfc_unres_lock);
2235 it->cache = &mrt->mfc_unres_queue;
2236 list_for_each_entry(mfc, it->cache, list)
2237 if (pos-- == 0)
2238 return mfc;
2239 spin_unlock_bh(&mfc_unres_lock);
2240
2241 it->cache = NULL;
2242 return NULL;
2243}
2244
2245
2246static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2247{
2248 struct ipmr_mfc_iter *it = seq->private;
2249 struct net *net = seq_file_net(seq);
2250 struct mr_table *mrt;
2251
2252 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2253 if (mrt == NULL)
2254 return ERR_PTR(-ENOENT);
2255
2256 it->mrt = mrt;
2257 it->cache = NULL;
2258 it->ct = 0;
2259 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
2260 : SEQ_START_TOKEN;
2261}
2262
2263static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2264{
2265 struct mfc_cache *mfc = v;
2266 struct ipmr_mfc_iter *it = seq->private;
2267 struct net *net = seq_file_net(seq);
2268 struct mr_table *mrt = it->mrt;
2269
2270 ++*pos;
2271
2272 if (v == SEQ_START_TOKEN)
2273 return ipmr_mfc_seq_idx(net, seq->private, 0);
2274
2275 if (mfc->list.next != it->cache)
2276 return list_entry(mfc->list.next, struct mfc_cache, list);
2277
2278 if (it->cache == &mrt->mfc_unres_queue)
2279 goto end_of_list;
2280
2281 BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
2282
2283 while (++it->ct < MFC_LINES) {
2284 it->cache = &mrt->mfc_cache_array[it->ct];
2285 if (list_empty(it->cache))
2286 continue;
2287 return list_first_entry(it->cache, struct mfc_cache, list);
2288 }
2289
2290 /* exhausted cache_array, show unresolved */
2291 rcu_read_unlock();
2292 it->cache = &mrt->mfc_unres_queue;
2293 it->ct = 0;
2294
2295 spin_lock_bh(&mfc_unres_lock);
2296 if (!list_empty(it->cache))
2297 return list_first_entry(it->cache, struct mfc_cache, list);
2298
2299end_of_list:
2300 spin_unlock_bh(&mfc_unres_lock);
2301 it->cache = NULL;
2302
2303 return NULL;
2304}
2305
2306static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
2307{
2308 struct ipmr_mfc_iter *it = seq->private;
2309 struct mr_table *mrt = it->mrt;
2310
2311 if (it->cache == &mrt->mfc_unres_queue)
2312 spin_unlock_bh(&mfc_unres_lock);
2313 else if (it->cache == &mrt->mfc_cache_array[it->ct])
2314 rcu_read_unlock();
2315}
2316
2317static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2318{
2319 int n;
2320
2321 if (v == SEQ_START_TOKEN) {
2322 seq_puts(seq,
2323 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2324 } else {
2325 const struct mfc_cache *mfc = v;
2326 const struct ipmr_mfc_iter *it = seq->private;
2327 const struct mr_table *mrt = it->mrt;
2328
2329 seq_printf(seq, "%08X %08X %-3hd",
2330 (__force u32) mfc->mfc_mcastgrp,
2331 (__force u32) mfc->mfc_origin,
2332 mfc->mfc_parent);
2333
2334 if (it->cache != &mrt->mfc_unres_queue) {
2335 seq_printf(seq, " %8lu %8lu %8lu",
2336 mfc->mfc_un.res.pkt,
2337 mfc->mfc_un.res.bytes,
2338 mfc->mfc_un.res.wrong_if);
2339 for (n = mfc->mfc_un.res.minvif;
2340 n < mfc->mfc_un.res.maxvif; n++) {
2341 if (VIF_EXISTS(mrt, n) &&
2342 mfc->mfc_un.res.ttls[n] < 255)
2343 seq_printf(seq,
2344 " %2d:%-3d",
2345 n, mfc->mfc_un.res.ttls[n]);
2346 }
2347 } else {
2348 /* unresolved mfc_caches don't contain
2349 * pkt, bytes and wrong_if values
2350 */
2351 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
2352 }
2353 seq_putc(seq, '\n');
2354 }
2355 return 0;
2356}
2357
2358static const struct seq_operations ipmr_mfc_seq_ops = {
2359 .start = ipmr_mfc_seq_start,
2360 .next = ipmr_mfc_seq_next,
2361 .stop = ipmr_mfc_seq_stop,
2362 .show = ipmr_mfc_seq_show,
2363};
2364
2365static int ipmr_mfc_open(struct inode *inode, struct file *file)
2366{
2367 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
2368 sizeof(struct ipmr_mfc_iter));
2369}
2370
2371static const struct file_operations ipmr_mfc_fops = {
2372 .owner = THIS_MODULE,
2373 .open = ipmr_mfc_open,
2374 .read = seq_read,
2375 .llseek = seq_lseek,
2376 .release = seq_release_net,
2377};
2378#endif
2379
2380#ifdef CONFIG_IP_PIMSM_V2
2381static const struct net_protocol pim_protocol = {
2382 .handler = pim_rcv,
2383 .netns_ok = 1,
2384};
2385#endif
2386
2387
2388/*
2389 * Setup for IP multicast routing
2390 */
2391static int __net_init ipmr_net_init(struct net *net)
2392{
2393 int err;
2394
2395 err = ipmr_rules_init(net);
2396 if (err < 0)
2397 goto fail;
2398
2399#ifdef CONFIG_PROC_FS
2400 err = -ENOMEM;
2401 if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops))
2402 goto proc_vif_fail;
2403 if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops))
2404 goto proc_cache_fail;
2405#endif
2406 return 0;
2407
2408#ifdef CONFIG_PROC_FS
2409proc_cache_fail:
2410 proc_net_remove(net, "ip_mr_vif");
2411proc_vif_fail:
2412 ipmr_rules_exit(net);
2413#endif
2414fail:
2415 return err;
2416}
2417
2418static void __net_exit ipmr_net_exit(struct net *net)
2419{
2420#ifdef CONFIG_PROC_FS
2421 proc_net_remove(net, "ip_mr_cache");
2422 proc_net_remove(net, "ip_mr_vif");
2423#endif
2424 ipmr_rules_exit(net);
2425}
2426
2427static struct pernet_operations ipmr_net_ops = {
2428 .init = ipmr_net_init,
2429 .exit = ipmr_net_exit,
2430};
2431
2432int __init ip_mr_init(void)
2433{
2434 int err;
2435
2436 mrt_cachep = kmem_cache_create("ip_mrt_cache",
2437 sizeof(struct mfc_cache),
2438 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
2439 NULL);
2440 if (!mrt_cachep)
2441 return -ENOMEM;
2442
2443 err = register_pernet_subsys(&ipmr_net_ops);
2444 if (err)
2445 goto reg_pernet_fail;
2446
2447 err = register_netdevice_notifier(&ip_mr_notifier);
2448 if (err)
2449 goto reg_notif_fail;
2450#ifdef CONFIG_IP_PIMSM_V2
2451 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
2452 printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n");
2453 err = -EAGAIN;
2454 goto add_proto_fail;
2455 }
2456#endif
2457 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute);
2458 return 0;
2459
2460#ifdef CONFIG_IP_PIMSM_V2
2461add_proto_fail:
2462 unregister_netdevice_notifier(&ip_mr_notifier);
2463#endif
2464reg_notif_fail:
2465 unregister_pernet_subsys(&ipmr_net_ops);
2466reg_pernet_fail:
2467 kmem_cache_destroy(mrt_cachep);
2468 return err;
2469}
Clone of davem's net-next-2.6 tree