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29#include <asm/system.h>
30#include <asm/uaccess.h>
31#include <linux/types.h>
32#include <linux/capability.h>
33#include <linux/errno.h>
34#include <linux/timer.h>
35#include <linux/mm.h>
36#include <linux/kernel.h>
37#include <linux/fcntl.h>
38#include <linux/stat.h>
39#include <linux/socket.h>
40#include <linux/in.h>
41#include <linux/inet.h>
42#include <linux/netdevice.h>
43#include <linux/inetdevice.h>
44#include <linux/igmp.h>
45#include <linux/proc_fs.h>
46#include <linux/seq_file.h>
47#include <linux/mroute.h>
48#include <linux/init.h>
49#include <linux/if_ether.h>
50#include <linux/slab.h>
51#include <net/net_namespace.h>
52#include <net/ip.h>
53#include <net/protocol.h>
54#include <linux/skbuff.h>
55#include <net/route.h>
56#include <net/sock.h>
57#include <net/icmp.h>
58#include <net/udp.h>
59#include <net/raw.h>
60#include <linux/notifier.h>
61#include <linux/if_arp.h>
62#include <linux/netfilter_ipv4.h>
63#include <linux/compat.h>
64#include <net/ipip.h>
65#include <net/checksum.h>
66#include <net/netlink.h>
67#include <net/fib_rules.h>
68
69#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
70#define CONFIG_IP_PIMSM 1
71#endif
72
73struct mr_table {
74 struct list_head list;
75#ifdef CONFIG_NET_NS
76 struct net *net;
77#endif
78 u32 id;
79 struct sock __rcu *mroute_sk;
80 struct timer_list ipmr_expire_timer;
81 struct list_head mfc_unres_queue;
82 struct list_head mfc_cache_array[MFC_LINES];
83 struct vif_device vif_table[MAXVIFS];
84 int maxvif;
85 atomic_t cache_resolve_queue_len;
86 int mroute_do_assert;
87 int mroute_do_pim;
88#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
89 int mroute_reg_vif_num;
90#endif
91};
92
93struct ipmr_rule {
94 struct fib_rule common;
95};
96
97struct ipmr_result {
98 struct mr_table *mrt;
99};
100
101
102
103
104
105static DEFINE_RWLOCK(mrt_lock);
106
107
108
109
110
111#define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL)
112
113
114static DEFINE_SPINLOCK(mfc_unres_lock);
115
116
117
118
119
120
121
122
123
124static struct kmem_cache *mrt_cachep __read_mostly;
125
126static struct mr_table *ipmr_new_table(struct net *net, u32 id);
127static int ip_mr_forward(struct net *net, struct mr_table *mrt,
128 struct sk_buff *skb, struct mfc_cache *cache,
129 int local);
130static int ipmr_cache_report(struct mr_table *mrt,
131 struct sk_buff *pkt, vifi_t vifi, int assert);
132static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
133 struct mfc_cache *c, struct rtmsg *rtm);
134static void ipmr_expire_process(unsigned long arg);
135
136#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
137#define ipmr_for_each_table(mrt, net) \
138 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list)
139
140static struct mr_table *ipmr_get_table(struct net *net, u32 id)
141{
142 struct mr_table *mrt;
143
144 ipmr_for_each_table(mrt, net) {
145 if (mrt->id == id)
146 return mrt;
147 }
148 return NULL;
149}
150
151static int ipmr_fib_lookup(struct net *net, struct flowi *flp,
152 struct mr_table **mrt)
153{
154 struct ipmr_result res;
155 struct fib_lookup_arg arg = { .result = &res, };
156 int err;
157
158 err = fib_rules_lookup(net->ipv4.mr_rules_ops, flp, 0, &arg);
159 if (err < 0)
160 return err;
161 *mrt = res.mrt;
162 return 0;
163}
164
165static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp,
166 int flags, struct fib_lookup_arg *arg)
167{
168 struct ipmr_result *res = arg->result;
169 struct mr_table *mrt;
170
171 switch (rule->action) {
172 case FR_ACT_TO_TBL:
173 break;
174 case FR_ACT_UNREACHABLE:
175 return -ENETUNREACH;
176 case FR_ACT_PROHIBIT:
177 return -EACCES;
178 case FR_ACT_BLACKHOLE:
179 default:
180 return -EINVAL;
181 }
182
183 mrt = ipmr_get_table(rule->fr_net, rule->table);
184 if (mrt == NULL)
185 return -EAGAIN;
186 res->mrt = mrt;
187 return 0;
188}
189
190static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
191{
192 return 1;
193}
194
195static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = {
196 FRA_GENERIC_POLICY,
197};
198
199static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
200 struct fib_rule_hdr *frh, struct nlattr **tb)
201{
202 return 0;
203}
204
205static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
206 struct nlattr **tb)
207{
208 return 1;
209}
210
211static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
212 struct fib_rule_hdr *frh)
213{
214 frh->dst_len = 0;
215 frh->src_len = 0;
216 frh->tos = 0;
217 return 0;
218}
219
220static const struct fib_rules_ops __net_initdata ipmr_rules_ops_template = {
221 .family = RTNL_FAMILY_IPMR,
222 .rule_size = sizeof(struct ipmr_rule),
223 .addr_size = sizeof(u32),
224 .action = ipmr_rule_action,
225 .match = ipmr_rule_match,
226 .configure = ipmr_rule_configure,
227 .compare = ipmr_rule_compare,
228 .default_pref = fib_default_rule_pref,
229 .fill = ipmr_rule_fill,
230 .nlgroup = RTNLGRP_IPV4_RULE,
231 .policy = ipmr_rule_policy,
232 .owner = THIS_MODULE,
233};
234
235static int __net_init ipmr_rules_init(struct net *net)
236{
237 struct fib_rules_ops *ops;
238 struct mr_table *mrt;
239 int err;
240
241 ops = fib_rules_register(&ipmr_rules_ops_template, net);
242 if (IS_ERR(ops))
243 return PTR_ERR(ops);
244
245 INIT_LIST_HEAD(&net->ipv4.mr_tables);
246
247 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
248 if (mrt == NULL) {
249 err = -ENOMEM;
250 goto err1;
251 }
252
253 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0);
254 if (err < 0)
255 goto err2;
256
257 net->ipv4.mr_rules_ops = ops;
258 return 0;
259
260err2:
261 kfree(mrt);
262err1:
263 fib_rules_unregister(ops);
264 return err;
265}
266
267static void __net_exit ipmr_rules_exit(struct net *net)
268{
269 struct mr_table *mrt, *next;
270
271 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) {
272 list_del(&mrt->list);
273 kfree(mrt);
274 }
275 fib_rules_unregister(net->ipv4.mr_rules_ops);
276}
277#else
278#define ipmr_for_each_table(mrt, net) \
279 for (mrt = net->ipv4.mrt; mrt; mrt = NULL)
280
281static struct mr_table *ipmr_get_table(struct net *net, u32 id)
282{
283 return net->ipv4.mrt;
284}
285
286static int ipmr_fib_lookup(struct net *net, struct flowi *flp,
287 struct mr_table **mrt)
288{
289 *mrt = net->ipv4.mrt;
290 return 0;
291}
292
293static int __net_init ipmr_rules_init(struct net *net)
294{
295 net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT);
296 return net->ipv4.mrt ? 0 : -ENOMEM;
297}
298
299static void __net_exit ipmr_rules_exit(struct net *net)
300{
301 kfree(net->ipv4.mrt);
302}
303#endif
304
305static struct mr_table *ipmr_new_table(struct net *net, u32 id)
306{
307 struct mr_table *mrt;
308 unsigned int i;
309
310 mrt = ipmr_get_table(net, id);
311 if (mrt != NULL)
312 return mrt;
313
314 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
315 if (mrt == NULL)
316 return NULL;
317 write_pnet(&mrt->net, net);
318 mrt->id = id;
319
320
321 for (i = 0; i < MFC_LINES; i++)
322 INIT_LIST_HEAD(&mrt->mfc_cache_array[i]);
323
324 INIT_LIST_HEAD(&mrt->mfc_unres_queue);
325
326 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
327 (unsigned long)mrt);
328
329#ifdef CONFIG_IP_PIMSM
330 mrt->mroute_reg_vif_num = -1;
331#endif
332#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
333 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
334#endif
335 return mrt;
336}
337
338
339
340static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
341{
342 struct net *net = dev_net(dev);
343
344 dev_close(dev);
345
346 dev = __dev_get_by_name(net, "tunl0");
347 if (dev) {
348 const struct net_device_ops *ops = dev->netdev_ops;
349 struct ifreq ifr;
350 struct ip_tunnel_parm p;
351
352 memset(&p, 0, sizeof(p));
353 p.iph.daddr = v->vifc_rmt_addr.s_addr;
354 p.iph.saddr = v->vifc_lcl_addr.s_addr;
355 p.iph.version = 4;
356 p.iph.ihl = 5;
357 p.iph.protocol = IPPROTO_IPIP;
358 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
359 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
360
361 if (ops->ndo_do_ioctl) {
362 mm_segment_t oldfs = get_fs();
363
364 set_fs(KERNEL_DS);
365 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
366 set_fs(oldfs);
367 }
368 }
369}
370
371static
372struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
373{
374 struct net_device *dev;
375
376 dev = __dev_get_by_name(net, "tunl0");
377
378 if (dev) {
379 const struct net_device_ops *ops = dev->netdev_ops;
380 int err;
381 struct ifreq ifr;
382 struct ip_tunnel_parm p;
383 struct in_device *in_dev;
384
385 memset(&p, 0, sizeof(p));
386 p.iph.daddr = v->vifc_rmt_addr.s_addr;
387 p.iph.saddr = v->vifc_lcl_addr.s_addr;
388 p.iph.version = 4;
389 p.iph.ihl = 5;
390 p.iph.protocol = IPPROTO_IPIP;
391 sprintf(p.name, "dvmrp%d", v->vifc_vifi);
392 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
393
394 if (ops->ndo_do_ioctl) {
395 mm_segment_t oldfs = get_fs();
396
397 set_fs(KERNEL_DS);
398 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
399 set_fs(oldfs);
400 } else {
401 err = -EOPNOTSUPP;
402 }
403 dev = NULL;
404
405 if (err == 0 &&
406 (dev = __dev_get_by_name(net, p.name)) != NULL) {
407 dev->flags |= IFF_MULTICAST;
408
409 in_dev = __in_dev_get_rtnl(dev);
410 if (in_dev == NULL)
411 goto failure;
412
413 ipv4_devconf_setall(in_dev);
414 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
415
416 if (dev_open(dev))
417 goto failure;
418 dev_hold(dev);
419 }
420 }
421 return dev;
422
423failure:
424
425 rtnl_unlock();
426 rtnl_lock();
427
428 unregister_netdevice(dev);
429 return NULL;
430}
431
432#ifdef CONFIG_IP_PIMSM
433
434static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
435{
436 struct net *net = dev_net(dev);
437 struct mr_table *mrt;
438 struct flowi fl = {
439 .oif = dev->ifindex,
440 .iif = skb->skb_iif,
441 .mark = skb->mark,
442 };
443 int err;
444
445 err = ipmr_fib_lookup(net, &fl, &mrt);
446 if (err < 0) {
447 kfree_skb(skb);
448 return err;
449 }
450
451 read_lock(&mrt_lock);
452 dev->stats.tx_bytes += skb->len;
453 dev->stats.tx_packets++;
454 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT);
455 read_unlock(&mrt_lock);
456 kfree_skb(skb);
457 return NETDEV_TX_OK;
458}
459
460static const struct net_device_ops reg_vif_netdev_ops = {
461 .ndo_start_xmit = reg_vif_xmit,
462};
463
464static void reg_vif_setup(struct net_device *dev)
465{
466 dev->type = ARPHRD_PIMREG;
467 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8;
468 dev->flags = IFF_NOARP;
469 dev->netdev_ops = ®_vif_netdev_ops,
470 dev->destructor = free_netdev;
471 dev->features |= NETIF_F_NETNS_LOCAL;
472}
473
474static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt)
475{
476 struct net_device *dev;
477 struct in_device *in_dev;
478 char name[IFNAMSIZ];
479
480 if (mrt->id == RT_TABLE_DEFAULT)
481 sprintf(name, "pimreg");
482 else
483 sprintf(name, "pimreg%u", mrt->id);
484
485 dev = alloc_netdev(0, name, reg_vif_setup);
486
487 if (dev == NULL)
488 return NULL;
489
490 dev_net_set(dev, net);
491
492 if (register_netdevice(dev)) {
493 free_netdev(dev);
494 return NULL;
495 }
496 dev->iflink = 0;
497
498 rcu_read_lock();
499 in_dev = __in_dev_get_rcu(dev);
500 if (!in_dev) {
501 rcu_read_unlock();
502 goto failure;
503 }
504
505 ipv4_devconf_setall(in_dev);
506 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;
507 rcu_read_unlock();
508
509 if (dev_open(dev))
510 goto failure;
511
512 dev_hold(dev);
513
514 return dev;
515
516failure:
517
518 rtnl_unlock();
519 rtnl_lock();
520
521 unregister_netdevice(dev);
522 return NULL;
523}
524#endif
525
526
527
528
529
530
531static int vif_delete(struct mr_table *mrt, int vifi, int notify,
532 struct list_head *head)
533{
534 struct vif_device *v;
535 struct net_device *dev;
536 struct in_device *in_dev;
537
538 if (vifi < 0 || vifi >= mrt->maxvif)
539 return -EADDRNOTAVAIL;
540
541 v = &mrt->vif_table[vifi];
542
543 write_lock_bh(&mrt_lock);
544 dev = v->dev;
545 v->dev = NULL;
546
547 if (!dev) {
548 write_unlock_bh(&mrt_lock);
549 return -EADDRNOTAVAIL;
550 }
551
552#ifdef CONFIG_IP_PIMSM
553 if (vifi == mrt->mroute_reg_vif_num)
554 mrt->mroute_reg_vif_num = -1;
555#endif
556
557 if (vifi + 1 == mrt->maxvif) {
558 int tmp;
559
560 for (tmp = vifi - 1; tmp >= 0; tmp--) {
561 if (VIF_EXISTS(mrt, tmp))
562 break;
563 }
564 mrt->maxvif = tmp+1;
565 }
566
567 write_unlock_bh(&mrt_lock);
568
569 dev_set_allmulti(dev, -1);
570
571 in_dev = __in_dev_get_rtnl(dev);
572 if (in_dev) {
573 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--;
574 ip_rt_multicast_event(in_dev);
575 }
576
577 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify)
578 unregister_netdevice_queue(dev, head);
579
580 dev_put(dev);
581 return 0;
582}
583
584static void ipmr_cache_free_rcu(struct rcu_head *head)
585{
586 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu);
587
588 kmem_cache_free(mrt_cachep, c);
589}
590
591static inline void ipmr_cache_free(struct mfc_cache *c)
592{
593 call_rcu(&c->rcu, ipmr_cache_free_rcu);
594}
595
596
597
598
599
600static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
601{
602 struct net *net = read_pnet(&mrt->net);
603 struct sk_buff *skb;
604 struct nlmsgerr *e;
605
606 atomic_dec(&mrt->cache_resolve_queue_len);
607
608 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) {
609 if (ip_hdr(skb)->version == 0) {
610 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
611 nlh->nlmsg_type = NLMSG_ERROR;
612 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
613 skb_trim(skb, nlh->nlmsg_len);
614 e = NLMSG_DATA(nlh);
615 e->error = -ETIMEDOUT;
616 memset(&e->msg, 0, sizeof(e->msg));
617
618 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
619 } else {
620 kfree_skb(skb);
621 }
622 }
623
624 ipmr_cache_free(c);
625}
626
627
628
629
630static void ipmr_expire_process(unsigned long arg)
631{
632 struct mr_table *mrt = (struct mr_table *)arg;
633 unsigned long now;
634 unsigned long expires;
635 struct mfc_cache *c, *next;
636
637 if (!spin_trylock(&mfc_unres_lock)) {
638 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10);
639 return;
640 }
641
642 if (list_empty(&mrt->mfc_unres_queue))
643 goto out;
644
645 now = jiffies;
646 expires = 10*HZ;
647
648 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
649 if (time_after(c->mfc_un.unres.expires, now)) {
650 unsigned long interval = c->mfc_un.unres.expires - now;
651 if (interval < expires)
652 expires = interval;
653 continue;
654 }
655
656 list_del(&c->list);
657 ipmr_destroy_unres(mrt, c);
658 }
659
660 if (!list_empty(&mrt->mfc_unres_queue))
661 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
662
663out:
664 spin_unlock(&mfc_unres_lock);
665}
666
667
668
669static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache,
670 unsigned char *ttls)
671{
672 int vifi;
673
674 cache->mfc_un.res.minvif = MAXVIFS;
675 cache->mfc_un.res.maxvif = 0;
676 memset(cache->mfc_un.res.ttls, 255, MAXVIFS);
677
678 for (vifi = 0; vifi < mrt->maxvif; vifi++) {
679 if (VIF_EXISTS(mrt, vifi) &&
680 ttls[vifi] && ttls[vifi] < 255) {
681 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
682 if (cache->mfc_un.res.minvif > vifi)
683 cache->mfc_un.res.minvif = vifi;
684 if (cache->mfc_un.res.maxvif <= vifi)
685 cache->mfc_un.res.maxvif = vifi + 1;
686 }
687 }
688}
689
690static int vif_add(struct net *net, struct mr_table *mrt,
691 struct vifctl *vifc, int mrtsock)
692{
693 int vifi = vifc->vifc_vifi;
694 struct vif_device *v = &mrt->vif_table[vifi];
695 struct net_device *dev;
696 struct in_device *in_dev;
697 int err;
698
699
700 if (VIF_EXISTS(mrt, vifi))
701 return -EADDRINUSE;
702
703 switch (vifc->vifc_flags) {
704#ifdef CONFIG_IP_PIMSM
705 case VIFF_REGISTER:
706
707
708
709
710 if (mrt->mroute_reg_vif_num >= 0)
711 return -EADDRINUSE;
712 dev = ipmr_reg_vif(net, mrt);
713 if (!dev)
714 return -ENOBUFS;
715 err = dev_set_allmulti(dev, 1);
716 if (err) {
717 unregister_netdevice(dev);
718 dev_put(dev);
719 return err;
720 }
721 break;
722#endif
723 case VIFF_TUNNEL:
724 dev = ipmr_new_tunnel(net, vifc);
725 if (!dev)
726 return -ENOBUFS;
727 err = dev_set_allmulti(dev, 1);
728 if (err) {
729 ipmr_del_tunnel(dev, vifc);
730 dev_put(dev);
731 return err;
732 }
733 break;
734
735 case VIFF_USE_IFINDEX:
736 case 0:
737 if (vifc->vifc_flags == VIFF_USE_IFINDEX) {
738 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex);
739 if (dev && __in_dev_get_rtnl(dev) == NULL) {
740 dev_put(dev);
741 return -EADDRNOTAVAIL;
742 }
743 } else {
744 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr);
745 }
746 if (!dev)
747 return -EADDRNOTAVAIL;
748 err = dev_set_allmulti(dev, 1);
749 if (err) {
750 dev_put(dev);
751 return err;
752 }
753 break;
754 default:
755 return -EINVAL;
756 }
757
758 in_dev = __in_dev_get_rtnl(dev);
759 if (!in_dev) {
760 dev_put(dev);
761 return -EADDRNOTAVAIL;
762 }
763 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++;
764 ip_rt_multicast_event(in_dev);
765
766
767
768 v->rate_limit = vifc->vifc_rate_limit;
769 v->local = vifc->vifc_lcl_addr.s_addr;
770 v->remote = vifc->vifc_rmt_addr.s_addr;
771 v->flags = vifc->vifc_flags;
772 if (!mrtsock)
773 v->flags |= VIFF_STATIC;
774 v->threshold = vifc->vifc_threshold;
775 v->bytes_in = 0;
776 v->bytes_out = 0;
777 v->pkt_in = 0;
778 v->pkt_out = 0;
779 v->link = dev->ifindex;
780 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER))
781 v->link = dev->iflink;
782
783
784 write_lock_bh(&mrt_lock);
785 v->dev = dev;
786#ifdef CONFIG_IP_PIMSM
787 if (v->flags & VIFF_REGISTER)
788 mrt->mroute_reg_vif_num = vifi;
789#endif
790 if (vifi+1 > mrt->maxvif)
791 mrt->maxvif = vifi+1;
792 write_unlock_bh(&mrt_lock);
793 return 0;
794}
795
796
797static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt,
798 __be32 origin,
799 __be32 mcastgrp)
800{
801 int line = MFC_HASH(mcastgrp, origin);
802 struct mfc_cache *c;
803
804 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) {
805 if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp)
806 return c;
807 }
808 return NULL;
809}
810
811
812
813
814static struct mfc_cache *ipmr_cache_alloc(void)
815{
816 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
817
818 if (c)
819 c->mfc_un.res.minvif = MAXVIFS;
820 return c;
821}
822
823static struct mfc_cache *ipmr_cache_alloc_unres(void)
824{
825 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
826
827 if (c) {
828 skb_queue_head_init(&c->mfc_un.unres.unresolved);
829 c->mfc_un.unres.expires = jiffies + 10*HZ;
830 }
831 return c;
832}
833
834
835
836
837
838static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt,
839 struct mfc_cache *uc, struct mfc_cache *c)
840{
841 struct sk_buff *skb;
842 struct nlmsgerr *e;
843
844
845
846 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
847 if (ip_hdr(skb)->version == 0) {
848 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr));
849
850 if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) {
851 nlh->nlmsg_len = skb_tail_pointer(skb) -
852 (u8 *)nlh;
853 } else {
854 nlh->nlmsg_type = NLMSG_ERROR;
855 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
856 skb_trim(skb, nlh->nlmsg_len);
857 e = NLMSG_DATA(nlh);
858 e->error = -EMSGSIZE;
859 memset(&e->msg, 0, sizeof(e->msg));
860 }
861
862 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
863 } else {
864 ip_mr_forward(net, mrt, skb, c, 0);
865 }
866 }
867}
868
869
870
871
872
873
874
875
876static int ipmr_cache_report(struct mr_table *mrt,
877 struct sk_buff *pkt, vifi_t vifi, int assert)
878{
879 struct sk_buff *skb;
880 const int ihl = ip_hdrlen(pkt);
881 struct igmphdr *igmp;
882 struct igmpmsg *msg;
883 struct sock *mroute_sk;
884 int ret;
885
886#ifdef CONFIG_IP_PIMSM
887 if (assert == IGMPMSG_WHOLEPKT)
888 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr));
889 else
890#endif
891 skb = alloc_skb(128, GFP_ATOMIC);
892
893 if (!skb)
894 return -ENOBUFS;
895
896#ifdef CONFIG_IP_PIMSM
897 if (assert == IGMPMSG_WHOLEPKT) {
898
899
900
901
902
903 skb_push(skb, sizeof(struct iphdr));
904 skb_reset_network_header(skb);
905 skb_reset_transport_header(skb);
906 msg = (struct igmpmsg *)skb_network_header(skb);
907 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr));
908 msg->im_msgtype = IGMPMSG_WHOLEPKT;
909 msg->im_mbz = 0;
910 msg->im_vif = mrt->mroute_reg_vif_num;
911 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2;
912 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) +
913 sizeof(struct iphdr));
914 } else
915#endif
916 {
917
918
919
920 skb->network_header = skb->tail;
921 skb_put(skb, ihl);
922 skb_copy_to_linear_data(skb, pkt->data, ihl);
923 ip_hdr(skb)->protocol = 0;
924 msg = (struct igmpmsg *)skb_network_header(skb);
925 msg->im_vif = vifi;
926 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
927
928
929
930 igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
931 igmp->type =
932 msg->im_msgtype = assert;
933 igmp->code = 0;
934 ip_hdr(skb)->tot_len = htons(skb->len);
935 skb->transport_header = skb->network_header;
936 }
937
938 rcu_read_lock();
939 mroute_sk = rcu_dereference(mrt->mroute_sk);
940 if (mroute_sk == NULL) {
941 rcu_read_unlock();
942 kfree_skb(skb);
943 return -EINVAL;
944 }
945
946
947
948 ret = sock_queue_rcv_skb(mroute_sk, skb);
949 rcu_read_unlock();
950 if (ret < 0) {
951 if (net_ratelimit())
952 printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n");
953 kfree_skb(skb);
954 }
955
956 return ret;
957}
958
959
960
961
962
963static int
964ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb)
965{
966 bool found = false;
967 int err;
968 struct mfc_cache *c;
969 const struct iphdr *iph = ip_hdr(skb);
970
971 spin_lock_bh(&mfc_unres_lock);
972 list_for_each_entry(c, &mrt->mfc_unres_queue, list) {
973 if (c->mfc_mcastgrp == iph->daddr &&
974 c->mfc_origin == iph->saddr) {
975 found = true;
976 break;
977 }
978 }
979
980 if (!found) {
981
982
983 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
984 (c = ipmr_cache_alloc_unres()) == NULL) {
985 spin_unlock_bh(&mfc_unres_lock);
986
987 kfree_skb(skb);
988 return -ENOBUFS;
989 }
990
991
992
993 c->mfc_parent = -1;
994 c->mfc_origin = iph->saddr;
995 c->mfc_mcastgrp = iph->daddr;
996
997
998
999 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE);
1000 if (err < 0) {
1001
1002
1003
1004 spin_unlock_bh(&mfc_unres_lock);
1005
1006 ipmr_cache_free(c);
1007 kfree_skb(skb);
1008 return err;
1009 }
1010
1011 atomic_inc(&mrt->cache_resolve_queue_len);
1012 list_add(&c->list, &mrt->mfc_unres_queue);
1013
1014 if (atomic_read(&mrt->cache_resolve_queue_len) == 1)
1015 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires);
1016 }
1017
1018
1019
1020 if (c->mfc_un.unres.unresolved.qlen > 3) {
1021 kfree_skb(skb);
1022 err = -ENOBUFS;
1023 } else {
1024 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
1025 err = 0;
1026 }
1027
1028 spin_unlock_bh(&mfc_unres_lock);
1029 return err;
1030}
1031
1032
1033
1034
1035
1036static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc)
1037{
1038 int line;
1039 struct mfc_cache *c, *next;
1040
1041 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1042
1043 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) {
1044 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1045 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
1046 list_del_rcu(&c->list);
1047
1048 ipmr_cache_free(c);
1049 return 0;
1050 }
1051 }
1052 return -ENOENT;
1053}
1054
1055static int ipmr_mfc_add(struct net *net, struct mr_table *mrt,
1056 struct mfcctl *mfc, int mrtsock)
1057{
1058 bool found = false;
1059 int line;
1060 struct mfc_cache *uc, *c;
1061
1062 if (mfc->mfcc_parent >= MAXVIFS)
1063 return -ENFILE;
1064
1065 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
1066
1067 list_for_each_entry(c, &mrt->mfc_cache_array[line], list) {
1068 if (c->mfc_origin == mfc->mfcc_origin.s_addr &&
1069 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) {
1070 found = true;
1071 break;
1072 }
1073 }
1074
1075 if (found) {
1076 write_lock_bh(&mrt_lock);
1077 c->mfc_parent = mfc->mfcc_parent;
1078 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1079 if (!mrtsock)
1080 c->mfc_flags |= MFC_STATIC;
1081 write_unlock_bh(&mrt_lock);
1082 return 0;
1083 }
1084
1085 if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr))
1086 return -EINVAL;
1087
1088 c = ipmr_cache_alloc();
1089 if (c == NULL)
1090 return -ENOMEM;
1091
1092 c->mfc_origin = mfc->mfcc_origin.s_addr;
1093 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr;
1094 c->mfc_parent = mfc->mfcc_parent;
1095 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls);
1096 if (!mrtsock)
1097 c->mfc_flags |= MFC_STATIC;
1098
1099 list_add_rcu(&c->list, &mrt->mfc_cache_array[line]);
1100
1101
1102
1103
1104
1105 found = false;
1106 spin_lock_bh(&mfc_unres_lock);
1107 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) {
1108 if (uc->mfc_origin == c->mfc_origin &&
1109 uc->mfc_mcastgrp == c->mfc_mcastgrp) {
1110 list_del(&uc->list);
1111 atomic_dec(&mrt->cache_resolve_queue_len);
1112 found = true;
1113 break;
1114 }
1115 }
1116 if (list_empty(&mrt->mfc_unres_queue))
1117 del_timer(&mrt->ipmr_expire_timer);
1118 spin_unlock_bh(&mfc_unres_lock);
1119
1120 if (found) {
1121 ipmr_cache_resolve(net, mrt, uc, c);
1122 ipmr_cache_free(uc);
1123 }
1124 return 0;
1125}
1126
1127
1128
1129
1130
1131static void mroute_clean_tables(struct mr_table *mrt)
1132{
1133 int i;
1134 LIST_HEAD(list);
1135 struct mfc_cache *c, *next;
1136
1137
1138
1139 for (i = 0; i < mrt->maxvif; i++) {
1140 if (!(mrt->vif_table[i].flags & VIFF_STATIC))
1141 vif_delete(mrt, i, 0, &list);
1142 }
1143 unregister_netdevice_many(&list);
1144
1145
1146
1147 for (i = 0; i < MFC_LINES; i++) {
1148 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) {
1149 if (c->mfc_flags & MFC_STATIC)
1150 continue;
1151 list_del_rcu(&c->list);
1152 ipmr_cache_free(c);
1153 }
1154 }
1155
1156 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
1157 spin_lock_bh(&mfc_unres_lock);
1158 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) {
1159 list_del(&c->list);
1160 ipmr_destroy_unres(mrt, c);
1161 }
1162 spin_unlock_bh(&mfc_unres_lock);
1163 }
1164}
1165
1166
1167
1168
1169static void mrtsock_destruct(struct sock *sk)
1170{
1171 struct net *net = sock_net(sk);
1172 struct mr_table *mrt;
1173
1174 rtnl_lock();
1175 ipmr_for_each_table(mrt, net) {
1176 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1177 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--;
1178 rcu_assign_pointer(mrt->mroute_sk, NULL);
1179 mroute_clean_tables(mrt);
1180 }
1181 }
1182 rtnl_unlock();
1183}
1184
1185
1186
1187
1188
1189
1190
1191
1192int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1193{
1194 int ret;
1195 struct vifctl vif;
1196 struct mfcctl mfc;
1197 struct net *net = sock_net(sk);
1198 struct mr_table *mrt;
1199
1200 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1201 if (mrt == NULL)
1202 return -ENOENT;
1203
1204 if (optname != MRT_INIT) {
1205 if (sk != rcu_dereference_raw(mrt->mroute_sk) &&
1206 !capable(CAP_NET_ADMIN))
1207 return -EACCES;
1208 }
1209
1210 switch (optname) {
1211 case MRT_INIT:
1212 if (sk->sk_type != SOCK_RAW ||
1213 inet_sk(sk)->inet_num != IPPROTO_IGMP)
1214 return -EOPNOTSUPP;
1215 if (optlen != sizeof(int))
1216 return -ENOPROTOOPT;
1217
1218 rtnl_lock();
1219 if (rtnl_dereference(mrt->mroute_sk)) {
1220 rtnl_unlock();
1221 return -EADDRINUSE;
1222 }
1223
1224 ret = ip_ra_control(sk, 1, mrtsock_destruct);
1225 if (ret == 0) {
1226 rcu_assign_pointer(mrt->mroute_sk, sk);
1227 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++;
1228 }
1229 rtnl_unlock();
1230 return ret;
1231 case MRT_DONE:
1232 if (sk != rcu_dereference_raw(mrt->mroute_sk))
1233 return -EACCES;
1234 return ip_ra_control(sk, 0, NULL);
1235 case MRT_ADD_VIF:
1236 case MRT_DEL_VIF:
1237 if (optlen != sizeof(vif))
1238 return -EINVAL;
1239 if (copy_from_user(&vif, optval, sizeof(vif)))
1240 return -EFAULT;
1241 if (vif.vifc_vifi >= MAXVIFS)
1242 return -ENFILE;
1243 rtnl_lock();
1244 if (optname == MRT_ADD_VIF) {
1245 ret = vif_add(net, mrt, &vif,
1246 sk == rtnl_dereference(mrt->mroute_sk));
1247 } else {
1248 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL);
1249 }
1250 rtnl_unlock();
1251 return ret;
1252
1253
1254
1255
1256
1257 case MRT_ADD_MFC:
1258 case MRT_DEL_MFC:
1259 if (optlen != sizeof(mfc))
1260 return -EINVAL;
1261 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1262 return -EFAULT;
1263 rtnl_lock();
1264 if (optname == MRT_DEL_MFC)
1265 ret = ipmr_mfc_delete(mrt, &mfc);
1266 else
1267 ret = ipmr_mfc_add(net, mrt, &mfc,
1268 sk == rtnl_dereference(mrt->mroute_sk));
1269 rtnl_unlock();
1270 return ret;
1271
1272
1273
1274 case MRT_ASSERT:
1275 {
1276 int v;
1277 if (get_user(v, (int __user *)optval))
1278 return -EFAULT;
1279 mrt->mroute_do_assert = (v) ? 1 : 0;
1280 return 0;
1281 }
1282#ifdef CONFIG_IP_PIMSM
1283 case MRT_PIM:
1284 {
1285 int v;
1286
1287 if (get_user(v, (int __user *)optval))
1288 return -EFAULT;
1289 v = (v) ? 1 : 0;
1290
1291 rtnl_lock();
1292 ret = 0;
1293 if (v != mrt->mroute_do_pim) {
1294 mrt->mroute_do_pim = v;
1295 mrt->mroute_do_assert = v;
1296 }
1297 rtnl_unlock();
1298 return ret;
1299 }
1300#endif
1301#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
1302 case MRT_TABLE:
1303 {
1304 u32 v;
1305
1306 if (optlen != sizeof(u32))
1307 return -EINVAL;
1308 if (get_user(v, (u32 __user *)optval))
1309 return -EFAULT;
1310
1311 rtnl_lock();
1312 ret = 0;
1313 if (sk == rtnl_dereference(mrt->mroute_sk)) {
1314 ret = -EBUSY;
1315 } else {
1316 if (!ipmr_new_table(net, v))
1317 ret = -ENOMEM;
1318 raw_sk(sk)->ipmr_table = v;
1319 }
1320 rtnl_unlock();
1321 return ret;
1322 }
1323#endif
1324
1325
1326
1327
1328 default:
1329 return -ENOPROTOOPT;
1330 }
1331}
1332
1333
1334
1335
1336
1337int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen)
1338{
1339 int olr;
1340 int val;
1341 struct net *net = sock_net(sk);
1342 struct mr_table *mrt;
1343
1344 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1345 if (mrt == NULL)
1346 return -ENOENT;
1347
1348 if (optname != MRT_VERSION &&
1349#ifdef CONFIG_IP_PIMSM
1350 optname != MRT_PIM &&
1351#endif
1352 optname != MRT_ASSERT)
1353 return -ENOPROTOOPT;
1354
1355 if (get_user(olr, optlen))
1356 return -EFAULT;
1357
1358 olr = min_t(unsigned int, olr, sizeof(int));
1359 if (olr < 0)
1360 return -EINVAL;
1361
1362 if (put_user(olr, optlen))
1363 return -EFAULT;
1364 if (optname == MRT_VERSION)
1365 val = 0x0305;
1366#ifdef CONFIG_IP_PIMSM
1367 else if (optname == MRT_PIM)
1368 val = mrt->mroute_do_pim;
1369#endif
1370 else
1371 val = mrt->mroute_do_assert;
1372 if (copy_to_user(optval, &val, olr))
1373 return -EFAULT;
1374 return 0;
1375}
1376
1377
1378
1379
1380
1381int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg)
1382{
1383 struct sioc_sg_req sr;
1384 struct sioc_vif_req vr;
1385 struct vif_device *vif;
1386 struct mfc_cache *c;
1387 struct net *net = sock_net(sk);
1388 struct mr_table *mrt;
1389
1390 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1391 if (mrt == NULL)
1392 return -ENOENT;
1393
1394 switch (cmd) {
1395 case SIOCGETVIFCNT:
1396 if (copy_from_user(&vr, arg, sizeof(vr)))
1397 return -EFAULT;
1398 if (vr.vifi >= mrt->maxvif)
1399 return -EINVAL;
1400 read_lock(&mrt_lock);
1401 vif = &mrt->vif_table[vr.vifi];
1402 if (VIF_EXISTS(mrt, vr.vifi)) {
1403 vr.icount = vif->pkt_in;
1404 vr.ocount = vif->pkt_out;
1405 vr.ibytes = vif->bytes_in;
1406 vr.obytes = vif->bytes_out;
1407 read_unlock(&mrt_lock);
1408
1409 if (copy_to_user(arg, &vr, sizeof(vr)))
1410 return -EFAULT;
1411 return 0;
1412 }
1413 read_unlock(&mrt_lock);
1414 return -EADDRNOTAVAIL;
1415 case SIOCGETSGCNT:
1416 if (copy_from_user(&sr, arg, sizeof(sr)))
1417 return -EFAULT;
1418
1419 rcu_read_lock();
1420 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1421 if (c) {
1422 sr.pktcnt = c->mfc_un.res.pkt;
1423 sr.bytecnt = c->mfc_un.res.bytes;
1424 sr.wrong_if = c->mfc_un.res.wrong_if;
1425 rcu_read_unlock();
1426
1427 if (copy_to_user(arg, &sr, sizeof(sr)))
1428 return -EFAULT;
1429 return 0;
1430 }
1431 rcu_read_unlock();
1432 return -EADDRNOTAVAIL;
1433 default:
1434 return -ENOIOCTLCMD;
1435 }
1436}
1437
1438#ifdef CONFIG_COMPAT
1439struct compat_sioc_sg_req {
1440 struct in_addr src;
1441 struct in_addr grp;
1442 compat_ulong_t pktcnt;
1443 compat_ulong_t bytecnt;
1444 compat_ulong_t wrong_if;
1445};
1446
1447struct compat_sioc_vif_req {
1448 vifi_t vifi;
1449 compat_ulong_t icount;
1450 compat_ulong_t ocount;
1451 compat_ulong_t ibytes;
1452 compat_ulong_t obytes;
1453};
1454
1455int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
1456{
1457 struct compat_sioc_sg_req sr;
1458 struct compat_sioc_vif_req vr;
1459 struct vif_device *vif;
1460 struct mfc_cache *c;
1461 struct net *net = sock_net(sk);
1462 struct mr_table *mrt;
1463
1464 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT);
1465 if (mrt == NULL)
1466 return -ENOENT;
1467
1468 switch (cmd) {
1469 case SIOCGETVIFCNT:
1470 if (copy_from_user(&vr, arg, sizeof(vr)))
1471 return -EFAULT;
1472 if (vr.vifi >= mrt->maxvif)
1473 return -EINVAL;
1474 read_lock(&mrt_lock);
1475 vif = &mrt->vif_table[vr.vifi];
1476 if (VIF_EXISTS(mrt, vr.vifi)) {
1477 vr.icount = vif->pkt_in;
1478 vr.ocount = vif->pkt_out;
1479 vr.ibytes = vif->bytes_in;
1480 vr.obytes = vif->bytes_out;
1481 read_unlock(&mrt_lock);
1482
1483 if (copy_to_user(arg, &vr, sizeof(vr)))
1484 return -EFAULT;
1485 return 0;
1486 }
1487 read_unlock(&mrt_lock);
1488 return -EADDRNOTAVAIL;
1489 case SIOCGETSGCNT:
1490 if (copy_from_user(&sr, arg, sizeof(sr)))
1491 return -EFAULT;
1492
1493 rcu_read_lock();
1494 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr);
1495 if (c) {
1496 sr.pktcnt = c->mfc_un.res.pkt;
1497 sr.bytecnt = c->mfc_un.res.bytes;
1498 sr.wrong_if = c->mfc_un.res.wrong_if;
1499 rcu_read_unlock();
1500
1501 if (copy_to_user(arg, &sr, sizeof(sr)))
1502 return -EFAULT;
1503 return 0;
1504 }
1505 rcu_read_unlock();
1506 return -EADDRNOTAVAIL;
1507 default:
1508 return -ENOIOCTLCMD;
1509 }
1510}
1511#endif
1512
1513
1514static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr)
1515{
1516 struct net_device *dev = ptr;
1517 struct net *net = dev_net(dev);
1518 struct mr_table *mrt;
1519 struct vif_device *v;
1520 int ct;
1521 LIST_HEAD(list);
1522
1523 if (event != NETDEV_UNREGISTER)
1524 return NOTIFY_DONE;
1525
1526 ipmr_for_each_table(mrt, net) {
1527 v = &mrt->vif_table[0];
1528 for (ct = 0; ct < mrt->maxvif; ct++, v++) {
1529 if (v->dev == dev)
1530 vif_delete(mrt, ct, 1, &list);
1531 }
1532 }
1533 unregister_netdevice_many(&list);
1534 return NOTIFY_DONE;
1535}
1536
1537
1538static struct notifier_block ip_mr_notifier = {
1539 .notifier_call = ipmr_device_event,
1540};
1541
1542
1543
1544
1545
1546
1547
1548static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr)
1549{
1550 struct iphdr *iph;
1551 struct iphdr *old_iph = ip_hdr(skb);
1552
1553 skb_push(skb, sizeof(struct iphdr));
1554 skb->transport_header = skb->network_header;
1555 skb_reset_network_header(skb);
1556 iph = ip_hdr(skb);
1557
1558 iph->version = 4;
1559 iph->tos = old_iph->tos;
1560 iph->ttl = old_iph->ttl;
1561 iph->frag_off = 0;
1562 iph->daddr = daddr;
1563 iph->saddr = saddr;
1564 iph->protocol = IPPROTO_IPIP;
1565 iph->ihl = 5;
1566 iph->tot_len = htons(skb->len);
1567 ip_select_ident(iph, skb_dst(skb), NULL);
1568 ip_send_check(iph);
1569
1570 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1571 nf_reset(skb);
1572}
1573
1574static inline int ipmr_forward_finish(struct sk_buff *skb)
1575{
1576 struct ip_options *opt = &(IPCB(skb)->opt);
1577
1578 IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS);
1579
1580 if (unlikely(opt->optlen))
1581 ip_forward_options(skb);
1582
1583 return dst_output(skb);
1584}
1585
1586
1587
1588
1589
1590static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt,
1591 struct sk_buff *skb, struct mfc_cache *c, int vifi)
1592{
1593 const struct iphdr *iph = ip_hdr(skb);
1594 struct vif_device *vif = &mrt->vif_table[vifi];
1595 struct net_device *dev;
1596 struct rtable *rt;
1597 int encap = 0;
1598
1599 if (vif->dev == NULL)
1600 goto out_free;
1601
1602#ifdef CONFIG_IP_PIMSM
1603 if (vif->flags & VIFF_REGISTER) {
1604 vif->pkt_out++;
1605 vif->bytes_out += skb->len;
1606 vif->dev->stats.tx_bytes += skb->len;
1607 vif->dev->stats.tx_packets++;
1608 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT);
1609 goto out_free;
1610 }
1611#endif
1612
1613 if (vif->flags & VIFF_TUNNEL) {
1614 struct flowi fl = {
1615 .oif = vif->link,
1616 .fl4_dst = vif->remote,
1617 .fl4_src = vif->local,
1618 .fl4_tos = RT_TOS(iph->tos),
1619 .proto = IPPROTO_IPIP
1620 };
1621
1622 if (ip_route_output_key(net, &rt, &fl))
1623 goto out_free;
1624 encap = sizeof(struct iphdr);
1625 } else {
1626 struct flowi fl = {
1627 .oif = vif->link,
1628 .fl4_dst = iph->daddr,
1629 .fl4_tos = RT_TOS(iph->tos),
1630 .proto = IPPROTO_IPIP
1631 };
1632
1633 if (ip_route_output_key(net, &rt, &fl))
1634 goto out_free;
1635 }
1636
1637 dev = rt->dst.dev;
1638
1639 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) {
1640
1641
1642
1643
1644
1645 IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS);
1646 ip_rt_put(rt);
1647 goto out_free;
1648 }
1649
1650 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len;
1651
1652 if (skb_cow(skb, encap)) {
1653 ip_rt_put(rt);
1654 goto out_free;
1655 }
1656
1657 vif->pkt_out++;
1658 vif->bytes_out += skb->len;
1659
1660 skb_dst_drop(skb);
1661 skb_dst_set(skb, &rt->dst);
1662 ip_decrease_ttl(ip_hdr(skb));
1663
1664
1665
1666
1667 if (vif->flags & VIFF_TUNNEL) {
1668 ip_encap(skb, vif->local, vif->remote);
1669
1670 vif->dev->stats.tx_packets++;
1671 vif->dev->stats.tx_bytes += skb->len;
1672 }
1673
1674 IPCB(skb)->flags |= IPSKB_FORWARDED;
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev,
1688 ipmr_forward_finish);
1689 return;
1690
1691out_free:
1692 kfree_skb(skb);
1693}
1694
1695static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev)
1696{
1697 int ct;
1698
1699 for (ct = mrt->maxvif-1; ct >= 0; ct--) {
1700 if (mrt->vif_table[ct].dev == dev)
1701 break;
1702 }
1703 return ct;
1704}
1705
1706
1707
1708static int ip_mr_forward(struct net *net, struct mr_table *mrt,
1709 struct sk_buff *skb, struct mfc_cache *cache,
1710 int local)
1711{
1712 int psend = -1;
1713 int vif, ct;
1714
1715 vif = cache->mfc_parent;
1716 cache->mfc_un.res.pkt++;
1717 cache->mfc_un.res.bytes += skb->len;
1718
1719
1720
1721
1722 if (mrt->vif_table[vif].dev != skb->dev) {
1723 int true_vifi;
1724
1725 if (rt_is_output_route(skb_rtable(skb))) {
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737 goto dont_forward;
1738 }
1739
1740 cache->mfc_un.res.wrong_if++;
1741 true_vifi = ipmr_find_vif(mrt, skb->dev);
1742
1743 if (true_vifi >= 0 && mrt->mroute_do_assert &&
1744
1745
1746
1747
1748
1749 (mrt->mroute_do_pim ||
1750 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1751 time_after(jiffies,
1752 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1753 cache->mfc_un.res.last_assert = jiffies;
1754 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF);
1755 }
1756 goto dont_forward;
1757 }
1758
1759 mrt->vif_table[vif].pkt_in++;
1760 mrt->vif_table[vif].bytes_in += skb->len;
1761
1762
1763
1764
1765 for (ct = cache->mfc_un.res.maxvif - 1;
1766 ct >= cache->mfc_un.res.minvif; ct--) {
1767 if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) {
1768 if (psend != -1) {
1769 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1770
1771 if (skb2)
1772 ipmr_queue_xmit(net, mrt, skb2, cache,
1773 psend);
1774 }
1775 psend = ct;
1776 }
1777 }
1778 if (psend != -1) {
1779 if (local) {
1780 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1781
1782 if (skb2)
1783 ipmr_queue_xmit(net, mrt, skb2, cache, psend);
1784 } else {
1785 ipmr_queue_xmit(net, mrt, skb, cache, psend);
1786 return 0;
1787 }
1788 }
1789
1790dont_forward:
1791 if (!local)
1792 kfree_skb(skb);
1793 return 0;
1794}
1795
1796
1797
1798
1799
1800
1801
1802int ip_mr_input(struct sk_buff *skb)
1803{
1804 struct mfc_cache *cache;
1805 struct net *net = dev_net(skb->dev);
1806 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
1807 struct mr_table *mrt;
1808 int err;
1809
1810
1811
1812
1813 if (IPCB(skb)->flags & IPSKB_FORWARDED)
1814 goto dont_forward;
1815
1816 err = ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt);
1817 if (err < 0) {
1818 kfree_skb(skb);
1819 return err;
1820 }
1821
1822 if (!local) {
1823 if (IPCB(skb)->opt.router_alert) {
1824 if (ip_call_ra_chain(skb))
1825 return 0;
1826 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) {
1827
1828
1829
1830
1831
1832
1833 struct sock *mroute_sk;
1834
1835 mroute_sk = rcu_dereference(mrt->mroute_sk);
1836 if (mroute_sk) {
1837 nf_reset(skb);
1838 raw_rcv(mroute_sk, skb);
1839 return 0;
1840 }
1841 }
1842 }
1843
1844
1845 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
1846
1847
1848
1849
1850 if (cache == NULL) {
1851 int vif;
1852
1853 if (local) {
1854 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1855 ip_local_deliver(skb);
1856 if (skb2 == NULL)
1857 return -ENOBUFS;
1858 skb = skb2;
1859 }
1860
1861 read_lock(&mrt_lock);
1862 vif = ipmr_find_vif(mrt, skb->dev);
1863 if (vif >= 0) {
1864 int err2 = ipmr_cache_unresolved(mrt, vif, skb);
1865 read_unlock(&mrt_lock);
1866
1867 return err2;
1868 }
1869 read_unlock(&mrt_lock);
1870 kfree_skb(skb);
1871 return -ENODEV;
1872 }
1873
1874 read_lock(&mrt_lock);
1875 ip_mr_forward(net, mrt, skb, cache, local);
1876 read_unlock(&mrt_lock);
1877
1878 if (local)
1879 return ip_local_deliver(skb);
1880
1881 return 0;
1882
1883dont_forward:
1884 if (local)
1885 return ip_local_deliver(skb);
1886 kfree_skb(skb);
1887 return 0;
1888}
1889
1890#ifdef CONFIG_IP_PIMSM
1891
1892static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb,
1893 unsigned int pimlen)
1894{
1895 struct net_device *reg_dev = NULL;
1896 struct iphdr *encap;
1897
1898 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen);
1899
1900
1901
1902
1903
1904
1905 if (!ipv4_is_multicast(encap->daddr) ||
1906 encap->tot_len == 0 ||
1907 ntohs(encap->tot_len) + pimlen > skb->len)
1908 return 1;
1909
1910 read_lock(&mrt_lock);
1911 if (mrt->mroute_reg_vif_num >= 0)
1912 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev;
1913 read_unlock(&mrt_lock);
1914
1915 if (reg_dev == NULL)
1916 return 1;
1917
1918 skb->mac_header = skb->network_header;
1919 skb_pull(skb, (u8 *)encap - skb->data);
1920 skb_reset_network_header(skb);
1921 skb->protocol = htons(ETH_P_IP);
1922 skb->ip_summed = CHECKSUM_NONE;
1923 skb->pkt_type = PACKET_HOST;
1924
1925 skb_tunnel_rx(skb, reg_dev);
1926
1927 netif_rx(skb);
1928
1929 return NET_RX_SUCCESS;
1930}
1931#endif
1932
1933#ifdef CONFIG_IP_PIMSM_V1
1934
1935
1936
1937
1938int pim_rcv_v1(struct sk_buff *skb)
1939{
1940 struct igmphdr *pim;
1941 struct net *net = dev_net(skb->dev);
1942 struct mr_table *mrt;
1943
1944 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1945 goto drop;
1946
1947 pim = igmp_hdr(skb);
1948
1949 if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0)
1950 goto drop;
1951
1952 if (!mrt->mroute_do_pim ||
1953 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER)
1954 goto drop;
1955
1956 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
1957drop:
1958 kfree_skb(skb);
1959 }
1960 return 0;
1961}
1962#endif
1963
1964#ifdef CONFIG_IP_PIMSM_V2
1965static int pim_rcv(struct sk_buff *skb)
1966{
1967 struct pimreghdr *pim;
1968 struct net *net = dev_net(skb->dev);
1969 struct mr_table *mrt;
1970
1971 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr)))
1972 goto drop;
1973
1974 pim = (struct pimreghdr *)skb_transport_header(skb);
1975 if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
1976 (pim->flags & PIM_NULL_REGISTER) ||
1977 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
1978 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
1979 goto drop;
1980
1981 if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0)
1982 goto drop;
1983
1984 if (__pim_rcv(mrt, skb, sizeof(*pim))) {
1985drop:
1986 kfree_skb(skb);
1987 }
1988 return 0;
1989}
1990#endif
1991
1992static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
1993 struct mfc_cache *c, struct rtmsg *rtm)
1994{
1995 int ct;
1996 struct rtnexthop *nhp;
1997 u8 *b = skb_tail_pointer(skb);
1998 struct rtattr *mp_head;
1999
2000
2001 if (c->mfc_parent >= MAXVIFS)
2002 return -ENOENT;
2003
2004 if (VIF_EXISTS(mrt, c->mfc_parent))
2005 RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex);
2006
2007 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
2008
2009 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
2010 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
2011 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
2012 goto rtattr_failure;
2013 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
2014 nhp->rtnh_flags = 0;
2015 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
2016 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex;
2017 nhp->rtnh_len = sizeof(*nhp);
2018 }
2019 }
2020 mp_head->rta_type = RTA_MULTIPATH;
2021 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
2022 rtm->rtm_type = RTN_MULTICAST;
2023 return 1;
2024
2025rtattr_failure:
2026 nlmsg_trim(skb, b);
2027 return -EMSGSIZE;
2028}
2029
2030int ipmr_get_route(struct net *net,
2031 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
2032{
2033 int err;
2034 struct mr_table *mrt;
2035 struct mfc_cache *cache;
2036 struct rtable *rt = skb_rtable(skb);
2037
2038 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2039 if (mrt == NULL)
2040 return -ENOENT;
2041
2042 rcu_read_lock();
2043 cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst);
2044
2045 if (cache == NULL) {
2046 struct sk_buff *skb2;
2047 struct iphdr *iph;
2048 struct net_device *dev;
2049 int vif = -1;
2050
2051 if (nowait) {
2052 rcu_read_unlock();
2053 return -EAGAIN;
2054 }
2055
2056 dev = skb->dev;
2057 read_lock(&mrt_lock);
2058 if (dev)
2059 vif = ipmr_find_vif(mrt, dev);
2060 if (vif < 0) {
2061 read_unlock(&mrt_lock);
2062 rcu_read_unlock();
2063 return -ENODEV;
2064 }
2065 skb2 = skb_clone(skb, GFP_ATOMIC);
2066 if (!skb2) {
2067 read_unlock(&mrt_lock);
2068 rcu_read_unlock();
2069 return -ENOMEM;
2070 }
2071
2072 skb_push(skb2, sizeof(struct iphdr));
2073 skb_reset_network_header(skb2);
2074 iph = ip_hdr(skb2);
2075 iph->ihl = sizeof(struct iphdr) >> 2;
2076 iph->saddr = rt->rt_src;
2077 iph->daddr = rt->rt_dst;
2078 iph->version = 0;
2079 err = ipmr_cache_unresolved(mrt, vif, skb2);
2080 read_unlock(&mrt_lock);
2081 rcu_read_unlock();
2082 return err;
2083 }
2084
2085 read_lock(&mrt_lock);
2086 if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY))
2087 cache->mfc_flags |= MFC_NOTIFY;
2088 err = __ipmr_fill_mroute(mrt, skb, cache, rtm);
2089 read_unlock(&mrt_lock);
2090 rcu_read_unlock();
2091 return err;
2092}
2093
2094static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
2095 u32 pid, u32 seq, struct mfc_cache *c)
2096{
2097 struct nlmsghdr *nlh;
2098 struct rtmsg *rtm;
2099
2100 nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI);
2101 if (nlh == NULL)
2102 return -EMSGSIZE;
2103
2104 rtm = nlmsg_data(nlh);
2105 rtm->rtm_family = RTNL_FAMILY_IPMR;
2106 rtm->rtm_dst_len = 32;
2107 rtm->rtm_src_len = 32;
2108 rtm->rtm_tos = 0;
2109 rtm->rtm_table = mrt->id;
2110 NLA_PUT_U32(skb, RTA_TABLE, mrt->id);
2111 rtm->rtm_type = RTN_MULTICAST;
2112 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2113 rtm->rtm_protocol = RTPROT_UNSPEC;
2114 rtm->rtm_flags = 0;
2115
2116 NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin);
2117 NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp);
2118
2119 if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0)
2120 goto nla_put_failure;
2121
2122 return nlmsg_end(skb, nlh);
2123
2124nla_put_failure:
2125 nlmsg_cancel(skb, nlh);
2126 return -EMSGSIZE;
2127}
2128
2129static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
2130{
2131 struct net *net = sock_net(skb->sk);
2132 struct mr_table *mrt;
2133 struct mfc_cache *mfc;
2134 unsigned int t = 0, s_t;
2135 unsigned int h = 0, s_h;
2136 unsigned int e = 0, s_e;
2137
2138 s_t = cb->args[0];
2139 s_h = cb->args[1];
2140 s_e = cb->args[2];
2141
2142 rcu_read_lock();
2143 ipmr_for_each_table(mrt, net) {
2144 if (t < s_t)
2145 goto next_table;
2146 if (t > s_t)
2147 s_h = 0;
2148 for (h = s_h; h < MFC_LINES; h++) {
2149 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) {
2150 if (e < s_e)
2151 goto next_entry;
2152 if (ipmr_fill_mroute(mrt, skb,
2153 NETLINK_CB(cb->skb).pid,
2154 cb->nlh->nlmsg_seq,
2155 mfc) < 0)
2156 goto done;
2157next_entry:
2158 e++;
2159 }
2160 e = s_e = 0;
2161 }
2162 s_h = 0;
2163next_table:
2164 t++;
2165 }
2166done:
2167 rcu_read_unlock();
2168
2169 cb->args[2] = e;
2170 cb->args[1] = h;
2171 cb->args[0] = t;
2172
2173 return skb->len;
2174}
2175
2176#ifdef CONFIG_PROC_FS
2177
2178
2179
2180
2181struct ipmr_vif_iter {
2182 struct seq_net_private p;
2183 struct mr_table *mrt;
2184 int ct;
2185};
2186
2187static struct vif_device *ipmr_vif_seq_idx(struct net *net,
2188 struct ipmr_vif_iter *iter,
2189 loff_t pos)
2190{
2191 struct mr_table *mrt = iter->mrt;
2192
2193 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
2194 if (!VIF_EXISTS(mrt, iter->ct))
2195 continue;
2196 if (pos-- == 0)
2197 return &mrt->vif_table[iter->ct];
2198 }
2199 return NULL;
2200}
2201
2202static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos)
2203 __acquires(mrt_lock)
2204{
2205 struct ipmr_vif_iter *iter = seq->private;
2206 struct net *net = seq_file_net(seq);
2207 struct mr_table *mrt;
2208
2209 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2210 if (mrt == NULL)
2211 return ERR_PTR(-ENOENT);
2212
2213 iter->mrt = mrt;
2214
2215 read_lock(&mrt_lock);
2216 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1)
2217 : SEQ_START_TOKEN;
2218}
2219
2220static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2221{
2222 struct ipmr_vif_iter *iter = seq->private;
2223 struct net *net = seq_file_net(seq);
2224 struct mr_table *mrt = iter->mrt;
2225
2226 ++*pos;
2227 if (v == SEQ_START_TOKEN)
2228 return ipmr_vif_seq_idx(net, iter, 0);
2229
2230 while (++iter->ct < mrt->maxvif) {
2231 if (!VIF_EXISTS(mrt, iter->ct))
2232 continue;
2233 return &mrt->vif_table[iter->ct];
2234 }
2235 return NULL;
2236}
2237
2238static void ipmr_vif_seq_stop(struct seq_file *seq, void *v)
2239 __releases(mrt_lock)
2240{
2241 read_unlock(&mrt_lock);
2242}
2243
2244static int ipmr_vif_seq_show(struct seq_file *seq, void *v)
2245{
2246 struct ipmr_vif_iter *iter = seq->private;
2247 struct mr_table *mrt = iter->mrt;
2248
2249 if (v == SEQ_START_TOKEN) {
2250 seq_puts(seq,
2251 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n");
2252 } else {
2253 const struct vif_device *vif = v;
2254 const char *name = vif->dev ? vif->dev->name : "none";
2255
2256 seq_printf(seq,
2257 "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n",
2258 vif - mrt->vif_table,
2259 name, vif->bytes_in, vif->pkt_in,
2260 vif->bytes_out, vif->pkt_out,
2261 vif->flags, vif->local, vif->remote);
2262 }
2263 return 0;
2264}
2265
2266static const struct seq_operations ipmr_vif_seq_ops = {
2267 .start = ipmr_vif_seq_start,
2268 .next = ipmr_vif_seq_next,
2269 .stop = ipmr_vif_seq_stop,
2270 .show = ipmr_vif_seq_show,
2271};
2272
2273static int ipmr_vif_open(struct inode *inode, struct file *file)
2274{
2275 return seq_open_net(inode, file, &ipmr_vif_seq_ops,
2276 sizeof(struct ipmr_vif_iter));
2277}
2278
2279static const struct file_operations ipmr_vif_fops = {
2280 .owner = THIS_MODULE,
2281 .open = ipmr_vif_open,
2282 .read = seq_read,
2283 .llseek = seq_lseek,
2284 .release = seq_release_net,
2285};
2286
2287struct ipmr_mfc_iter {
2288 struct seq_net_private p;
2289 struct mr_table *mrt;
2290 struct list_head *cache;
2291 int ct;
2292};
2293
2294
2295static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net,
2296 struct ipmr_mfc_iter *it, loff_t pos)
2297{
2298 struct mr_table *mrt = it->mrt;
2299 struct mfc_cache *mfc;
2300
2301 rcu_read_lock();
2302 for (it->ct = 0; it->ct < MFC_LINES; it->ct++) {
2303 it->cache = &mrt->mfc_cache_array[it->ct];
2304 list_for_each_entry_rcu(mfc, it->cache, list)
2305 if (pos-- == 0)
2306 return mfc;
2307 }
2308 rcu_read_unlock();
2309
2310 spin_lock_bh(&mfc_unres_lock);
2311 it->cache = &mrt->mfc_unres_queue;
2312 list_for_each_entry(mfc, it->cache, list)
2313 if (pos-- == 0)
2314 return mfc;
2315 spin_unlock_bh(&mfc_unres_lock);
2316
2317 it->cache = NULL;
2318 return NULL;
2319}
2320
2321
2322static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
2323{
2324 struct ipmr_mfc_iter *it = seq->private;
2325 struct net *net = seq_file_net(seq);
2326 struct mr_table *mrt;
2327
2328 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT);
2329 if (mrt == NULL)
2330 return ERR_PTR(-ENOENT);
2331
2332 it->mrt = mrt;
2333 it->cache = NULL;
2334 it->ct = 0;
2335 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
2336 : SEQ_START_TOKEN;
2337}
2338
2339static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2340{
2341 struct mfc_cache *mfc = v;
2342 struct ipmr_mfc_iter *it = seq->private;
2343 struct net *net = seq_file_net(seq);
2344 struct mr_table *mrt = it->mrt;
2345
2346 ++*pos;
2347
2348 if (v == SEQ_START_TOKEN)
2349 return ipmr_mfc_seq_idx(net, seq->private, 0);
2350
2351 if (mfc->list.next != it->cache)
2352 return list_entry(mfc->list.next, struct mfc_cache, list);
2353
2354 if (it->cache == &mrt->mfc_unres_queue)
2355 goto end_of_list;
2356
2357 BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]);
2358
2359 while (++it->ct < MFC_LINES) {
2360 it->cache = &mrt->mfc_cache_array[it->ct];
2361 if (list_empty(it->cache))
2362 continue;
2363 return list_first_entry(it->cache, struct mfc_cache, list);
2364 }
2365
2366
2367 rcu_read_unlock();
2368 it->cache = &mrt->mfc_unres_queue;
2369 it->ct = 0;
2370
2371 spin_lock_bh(&mfc_unres_lock);
2372 if (!list_empty(it->cache))
2373 return list_first_entry(it->cache, struct mfc_cache, list);
2374
2375end_of_list:
2376 spin_unlock_bh(&mfc_unres_lock);
2377 it->cache = NULL;
2378
2379 return NULL;
2380}
2381
2382static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
2383{
2384 struct ipmr_mfc_iter *it = seq->private;
2385 struct mr_table *mrt = it->mrt;
2386
2387 if (it->cache == &mrt->mfc_unres_queue)
2388 spin_unlock_bh(&mfc_unres_lock);
2389 else if (it->cache == &mrt->mfc_cache_array[it->ct])
2390 rcu_read_unlock();
2391}
2392
2393static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
2394{
2395 int n;
2396
2397 if (v == SEQ_START_TOKEN) {
2398 seq_puts(seq,
2399 "Group Origin Iif Pkts Bytes Wrong Oifs\n");
2400 } else {
2401 const struct mfc_cache *mfc = v;
2402 const struct ipmr_mfc_iter *it = seq->private;
2403 const struct mr_table *mrt = it->mrt;
2404
2405 seq_printf(seq, "%08X %08X %-3hd",
2406 (__force u32) mfc->mfc_mcastgrp,
2407 (__force u32) mfc->mfc_origin,
2408 mfc->mfc_parent);
2409
2410 if (it->cache != &mrt->mfc_unres_queue) {
2411 seq_printf(seq, " %8lu %8lu %8lu",
2412 mfc->mfc_un.res.pkt,
2413 mfc->mfc_un.res.bytes,
2414 mfc->mfc_un.res.wrong_if);
2415 for (n = mfc->mfc_un.res.minvif;
2416 n < mfc->mfc_un.res.maxvif; n++) {
2417 if (VIF_EXISTS(mrt, n) &&
2418 mfc->mfc_un.res.ttls[n] < 255)
2419 seq_printf(seq,
2420 " %2d:%-3d",
2421 n, mfc->mfc_un.res.ttls[n]);
2422 }
2423 } else {
2424
2425
2426
2427 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
2428 }
2429 seq_putc(seq, '\n');
2430 }
2431 return 0;
2432}
2433
2434static const struct seq_operations ipmr_mfc_seq_ops = {
2435 .start = ipmr_mfc_seq_start,
2436 .next = ipmr_mfc_seq_next,
2437 .stop = ipmr_mfc_seq_stop,
2438 .show = ipmr_mfc_seq_show,
2439};
2440
2441static int ipmr_mfc_open(struct inode *inode, struct file *file)
2442{
2443 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
2444 sizeof(struct ipmr_mfc_iter));
2445}
2446
2447static const struct file_operations ipmr_mfc_fops = {
2448 .owner = THIS_MODULE,
2449 .open = ipmr_mfc_open,
2450 .read = seq_read,
2451 .llseek = seq_lseek,
2452 .release = seq_release_net,
2453};
2454#endif
2455
2456#ifdef CONFIG_IP_PIMSM_V2
2457static const struct net_protocol pim_protocol = {
2458 .handler = pim_rcv,
2459 .netns_ok = 1,
2460};
2461#endif
2462
2463
2464
2465
2466
2467static int __net_init ipmr_net_init(struct net *net)
2468{
2469 int err;
2470
2471 err = ipmr_rules_init(net);
2472 if (err < 0)
2473 goto fail;
2474
2475#ifdef CONFIG_PROC_FS
2476 err = -ENOMEM;
2477 if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops))
2478 goto proc_vif_fail;
2479 if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops))
2480 goto proc_cache_fail;
2481#endif
2482 return 0;
2483
2484#ifdef CONFIG_PROC_FS
2485proc_cache_fail:
2486 proc_net_remove(net, "ip_mr_vif");
2487proc_vif_fail:
2488 ipmr_rules_exit(net);
2489#endif
2490fail:
2491 return err;
2492}
2493
2494static void __net_exit ipmr_net_exit(struct net *net)
2495{
2496#ifdef CONFIG_PROC_FS
2497 proc_net_remove(net, "ip_mr_cache");
2498 proc_net_remove(net, "ip_mr_vif");
2499#endif
2500 ipmr_rules_exit(net);
2501}
2502
2503static struct pernet_operations ipmr_net_ops = {
2504 .init = ipmr_net_init,
2505 .exit = ipmr_net_exit,
2506};
2507
2508int __init ip_mr_init(void)
2509{
2510 int err;
2511
2512 mrt_cachep = kmem_cache_create("ip_mrt_cache",
2513 sizeof(struct mfc_cache),
2514 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC,
2515 NULL);
2516 if (!mrt_cachep)
2517 return -ENOMEM;
2518
2519 err = register_pernet_subsys(&ipmr_net_ops);
2520 if (err)
2521 goto reg_pernet_fail;
2522
2523 err = register_netdevice_notifier(&ip_mr_notifier);
2524 if (err)
2525 goto reg_notif_fail;
2526#ifdef CONFIG_IP_PIMSM_V2
2527 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) {
2528 printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n");
2529 err = -EAGAIN;
2530 goto add_proto_fail;
2531 }
2532#endif
2533 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute);
2534 return 0;
2535
2536#ifdef CONFIG_IP_PIMSM_V2
2537add_proto_fail:
2538 unregister_netdevice_notifier(&ip_mr_notifier);
2539#endif
2540reg_notif_fail:
2541 unregister_pernet_subsys(&ipmr_net_ops);
2542reg_pernet_fail:
2543 kmem_cache_destroy(mrt_cachep);
2544 return err;
2545}
2546