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genetlink: Optimize and one bug fix in genl_generate_id()
[net-next-2.6.git] / net / ipv6 / ip6mr.c
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1/*
2 * Linux IPv6 multicast routing support for BSD pim6sd
3 * Based on net/ipv4/ipmr.c.
4 *
5 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
6 * LSIIT Laboratory, Strasbourg, France
7 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
8 * 6WIND, Paris, France
9 * Copyright (C)2007,2008 USAGI/WIDE Project
10 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 */
18
19#include <asm/system.h>
20#include <asm/uaccess.h>
21#include <linux/types.h>
22#include <linux/sched.h>
23#include <linux/errno.h>
24#include <linux/timer.h>
25#include <linux/mm.h>
26#include <linux/kernel.h>
27#include <linux/fcntl.h>
28#include <linux/stat.h>
29#include <linux/socket.h>
30#include <linux/inet.h>
31#include <linux/netdevice.h>
32#include <linux/inetdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/init.h>
36#include <net/protocol.h>
37#include <linux/skbuff.h>
38#include <net/sock.h>
39#include <net/raw.h>
40#include <linux/notifier.h>
41#include <linux/if_arp.h>
42#include <net/checksum.h>
43#include <net/netlink.h>
44
45#include <net/ipv6.h>
46#include <net/ip6_route.h>
47#include <linux/mroute6.h>
48#include <linux/pim.h>
49#include <net/addrconf.h>
50#include <linux/netfilter_ipv6.h>
51#include <net/ip6_checksum.h>
52
53/* Big lock, protecting vif table, mrt cache and mroute socket state.
54 Note that the changes are semaphored via rtnl_lock.
55 */
56
57static DEFINE_RWLOCK(mrt_lock);
58
59/*
60 * Multicast router control variables
61 */
62
63#define MIF_EXISTS(_net, _idx) ((_net)->ipv6.vif6_table[_idx].dev != NULL)
64
65static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
66
67/* Special spinlock for queue of unresolved entries */
68static DEFINE_SPINLOCK(mfc_unres_lock);
69
70/* We return to original Alan's scheme. Hash table of resolved
71 entries is changed only in process context and protected
72 with weak lock mrt_lock. Queue of unresolved entries is protected
73 with strong spinlock mfc_unres_lock.
74
75 In this case data path is free of exclusive locks at all.
76 */
77
78static struct kmem_cache *mrt_cachep __read_mostly;
79
80static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache);
81static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt,
82 mifi_t mifi, int assert);
83static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm);
84static void mroute_clean_tables(struct net *net);
85
86static struct timer_list ipmr_expire_timer;
87
88
89#ifdef CONFIG_PROC_FS
90
91struct ipmr_mfc_iter {
92 struct seq_net_private p;
93 struct mfc6_cache **cache;
94 int ct;
95};
96
97
98static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
99 struct ipmr_mfc_iter *it, loff_t pos)
100{
101 struct mfc6_cache *mfc;
102
103 it->cache = net->ipv6.mfc6_cache_array;
104 read_lock(&mrt_lock);
105 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++)
106 for (mfc = net->ipv6.mfc6_cache_array[it->ct];
107 mfc; mfc = mfc->next)
108 if (pos-- == 0)
109 return mfc;
110 read_unlock(&mrt_lock);
111
112 it->cache = &mfc_unres_queue;
113 spin_lock_bh(&mfc_unres_lock);
114 for (mfc = mfc_unres_queue; mfc; mfc = mfc->next)
115 if (net_eq(mfc6_net(mfc), net) &&
116 pos-- == 0)
117 return mfc;
118 spin_unlock_bh(&mfc_unres_lock);
119
120 it->cache = NULL;
121 return NULL;
122}
123
124
125
126
127/*
128 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
129 */
130
131struct ipmr_vif_iter {
132 struct seq_net_private p;
133 int ct;
134};
135
136static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
137 struct ipmr_vif_iter *iter,
138 loff_t pos)
139{
140 for (iter->ct = 0; iter->ct < net->ipv6.maxvif; ++iter->ct) {
141 if (!MIF_EXISTS(net, iter->ct))
142 continue;
143 if (pos-- == 0)
144 return &net->ipv6.vif6_table[iter->ct];
145 }
146 return NULL;
147}
148
149static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
150 __acquires(mrt_lock)
151{
152 struct net *net = seq_file_net(seq);
153
154 read_lock(&mrt_lock);
155 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
156 : SEQ_START_TOKEN;
157}
158
159static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
160{
161 struct ipmr_vif_iter *iter = seq->private;
162 struct net *net = seq_file_net(seq);
163
164 ++*pos;
165 if (v == SEQ_START_TOKEN)
166 return ip6mr_vif_seq_idx(net, iter, 0);
167
168 while (++iter->ct < net->ipv6.maxvif) {
169 if (!MIF_EXISTS(net, iter->ct))
170 continue;
171 return &net->ipv6.vif6_table[iter->ct];
172 }
173 return NULL;
174}
175
176static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
177 __releases(mrt_lock)
178{
179 read_unlock(&mrt_lock);
180}
181
182static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
183{
184 struct net *net = seq_file_net(seq);
185
186 if (v == SEQ_START_TOKEN) {
187 seq_puts(seq,
188 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n");
189 } else {
190 const struct mif_device *vif = v;
191 const char *name = vif->dev ? vif->dev->name : "none";
192
193 seq_printf(seq,
194 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n",
195 vif - net->ipv6.vif6_table,
196 name, vif->bytes_in, vif->pkt_in,
197 vif->bytes_out, vif->pkt_out,
198 vif->flags);
199 }
200 return 0;
201}
202
203static const struct seq_operations ip6mr_vif_seq_ops = {
204 .start = ip6mr_vif_seq_start,
205 .next = ip6mr_vif_seq_next,
206 .stop = ip6mr_vif_seq_stop,
207 .show = ip6mr_vif_seq_show,
208};
209
210static int ip6mr_vif_open(struct inode *inode, struct file *file)
211{
212 return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
213 sizeof(struct ipmr_vif_iter));
214}
215
216static const struct file_operations ip6mr_vif_fops = {
217 .owner = THIS_MODULE,
218 .open = ip6mr_vif_open,
219 .read = seq_read,
220 .llseek = seq_lseek,
221 .release = seq_release_net,
222};
223
224static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
225{
226 struct net *net = seq_file_net(seq);
227
228 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
229 : SEQ_START_TOKEN;
230}
231
232static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
233{
234 struct mfc6_cache *mfc = v;
235 struct ipmr_mfc_iter *it = seq->private;
236 struct net *net = seq_file_net(seq);
237
238 ++*pos;
239
240 if (v == SEQ_START_TOKEN)
241 return ipmr_mfc_seq_idx(net, seq->private, 0);
242
243 if (mfc->next)
244 return mfc->next;
245
246 if (it->cache == &mfc_unres_queue)
247 goto end_of_list;
248
249 BUG_ON(it->cache != net->ipv6.mfc6_cache_array);
250
251 while (++it->ct < MFC6_LINES) {
252 mfc = net->ipv6.mfc6_cache_array[it->ct];
253 if (mfc)
254 return mfc;
255 }
256
257 /* exhausted cache_array, show unresolved */
258 read_unlock(&mrt_lock);
259 it->cache = &mfc_unres_queue;
260 it->ct = 0;
261
262 spin_lock_bh(&mfc_unres_lock);
263 mfc = mfc_unres_queue;
264 if (mfc)
265 return mfc;
266
267 end_of_list:
268 spin_unlock_bh(&mfc_unres_lock);
269 it->cache = NULL;
270
271 return NULL;
272}
273
274static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
275{
276 struct ipmr_mfc_iter *it = seq->private;
277 struct net *net = seq_file_net(seq);
278
279 if (it->cache == &mfc_unres_queue)
280 spin_unlock_bh(&mfc_unres_lock);
281 else if (it->cache == net->ipv6.mfc6_cache_array)
282 read_unlock(&mrt_lock);
283}
284
285static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
286{
287 int n;
288 struct net *net = seq_file_net(seq);
289
290 if (v == SEQ_START_TOKEN) {
291 seq_puts(seq,
292 "Group "
293 "Origin "
294 "Iif Pkts Bytes Wrong Oifs\n");
295 } else {
296 const struct mfc6_cache *mfc = v;
297 const struct ipmr_mfc_iter *it = seq->private;
298
299 seq_printf(seq, "%pI6 %pI6 %-3hd",
300 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
301 mfc->mf6c_parent);
302
303 if (it->cache != &mfc_unres_queue) {
304 seq_printf(seq, " %8lu %8lu %8lu",
305 mfc->mfc_un.res.pkt,
306 mfc->mfc_un.res.bytes,
307 mfc->mfc_un.res.wrong_if);
308 for (n = mfc->mfc_un.res.minvif;
309 n < mfc->mfc_un.res.maxvif; n++) {
310 if (MIF_EXISTS(net, n) &&
311 mfc->mfc_un.res.ttls[n] < 255)
312 seq_printf(seq,
313 " %2d:%-3d",
314 n, mfc->mfc_un.res.ttls[n]);
315 }
316 } else {
317 /* unresolved mfc_caches don't contain
318 * pkt, bytes and wrong_if values
319 */
320 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
321 }
322 seq_putc(seq, '\n');
323 }
324 return 0;
325}
326
327static const struct seq_operations ipmr_mfc_seq_ops = {
328 .start = ipmr_mfc_seq_start,
329 .next = ipmr_mfc_seq_next,
330 .stop = ipmr_mfc_seq_stop,
331 .show = ipmr_mfc_seq_show,
332};
333
334static int ipmr_mfc_open(struct inode *inode, struct file *file)
335{
336 return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
337 sizeof(struct ipmr_mfc_iter));
338}
339
340static const struct file_operations ip6mr_mfc_fops = {
341 .owner = THIS_MODULE,
342 .open = ipmr_mfc_open,
343 .read = seq_read,
344 .llseek = seq_lseek,
345 .release = seq_release_net,
346};
347#endif
348
349#ifdef CONFIG_IPV6_PIMSM_V2
350
351static int pim6_rcv(struct sk_buff *skb)
352{
353 struct pimreghdr *pim;
354 struct ipv6hdr *encap;
355 struct net_device *reg_dev = NULL;
356 struct net *net = dev_net(skb->dev);
357 int reg_vif_num = net->ipv6.mroute_reg_vif_num;
358
359 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
360 goto drop;
361
362 pim = (struct pimreghdr *)skb_transport_header(skb);
363 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
364 (pim->flags & PIM_NULL_REGISTER) ||
365 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
366 sizeof(*pim), IPPROTO_PIM,
367 csum_partial((void *)pim, sizeof(*pim), 0)) &&
368 csum_fold(skb_checksum(skb, 0, skb->len, 0))))
369 goto drop;
370
371 /* check if the inner packet is destined to mcast group */
372 encap = (struct ipv6hdr *)(skb_transport_header(skb) +
373 sizeof(*pim));
374
375 if (!ipv6_addr_is_multicast(&encap->daddr) ||
376 encap->payload_len == 0 ||
377 ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
378 goto drop;
379
380 read_lock(&mrt_lock);
381 if (reg_vif_num >= 0)
382 reg_dev = net->ipv6.vif6_table[reg_vif_num].dev;
383 if (reg_dev)
384 dev_hold(reg_dev);
385 read_unlock(&mrt_lock);
386
387 if (reg_dev == NULL)
388 goto drop;
389
390 skb->mac_header = skb->network_header;
391 skb_pull(skb, (u8 *)encap - skb->data);
392 skb_reset_network_header(skb);
393 skb->dev = reg_dev;
394 skb->protocol = htons(ETH_P_IPV6);
395 skb->ip_summed = 0;
396 skb->pkt_type = PACKET_HOST;
397 skb_dst_drop(skb);
398 reg_dev->stats.rx_bytes += skb->len;
399 reg_dev->stats.rx_packets++;
400 nf_reset(skb);
401 netif_rx(skb);
402 dev_put(reg_dev);
403 return 0;
404 drop:
405 kfree_skb(skb);
406 return 0;
407}
408
409static const struct inet6_protocol pim6_protocol = {
410 .handler = pim6_rcv,
411};
412
413/* Service routines creating virtual interfaces: PIMREG */
414
415static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
416 struct net_device *dev)
417{
418 struct net *net = dev_net(dev);
419
420 read_lock(&mrt_lock);
421 dev->stats.tx_bytes += skb->len;
422 dev->stats.tx_packets++;
423 ip6mr_cache_report(net, skb, net->ipv6.mroute_reg_vif_num,
424 MRT6MSG_WHOLEPKT);
425 read_unlock(&mrt_lock);
426 kfree_skb(skb);
427 return NETDEV_TX_OK;
428}
429
430static const struct net_device_ops reg_vif_netdev_ops = {
431 .ndo_start_xmit = reg_vif_xmit,
432};
433
434static void reg_vif_setup(struct net_device *dev)
435{
436 dev->type = ARPHRD_PIMREG;
437 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
438 dev->flags = IFF_NOARP;
439 dev->netdev_ops = &reg_vif_netdev_ops;
440 dev->destructor = free_netdev;
441 dev->features |= NETIF_F_NETNS_LOCAL;
442}
443
444static struct net_device *ip6mr_reg_vif(struct net *net)
445{
446 struct net_device *dev;
447
448 dev = alloc_netdev(0, "pim6reg", reg_vif_setup);
449 if (dev == NULL)
450 return NULL;
451
452 dev_net_set(dev, net);
453
454 if (register_netdevice(dev)) {
455 free_netdev(dev);
456 return NULL;
457 }
458 dev->iflink = 0;
459
460 if (dev_open(dev))
461 goto failure;
462
463 dev_hold(dev);
464 return dev;
465
466failure:
467 /* allow the register to be completed before unregistering. */
468 rtnl_unlock();
469 rtnl_lock();
470
471 unregister_netdevice(dev);
472 return NULL;
473}
474#endif
475
476/*
477 * Delete a VIF entry
478 */
479
480static int mif6_delete(struct net *net, int vifi)
481{
482 struct mif_device *v;
483 struct net_device *dev;
484 struct inet6_dev *in6_dev;
485 if (vifi < 0 || vifi >= net->ipv6.maxvif)
486 return -EADDRNOTAVAIL;
487
488 v = &net->ipv6.vif6_table[vifi];
489
490 write_lock_bh(&mrt_lock);
491 dev = v->dev;
492 v->dev = NULL;
493
494 if (!dev) {
495 write_unlock_bh(&mrt_lock);
496 return -EADDRNOTAVAIL;
497 }
498
499#ifdef CONFIG_IPV6_PIMSM_V2
500 if (vifi == net->ipv6.mroute_reg_vif_num)
501 net->ipv6.mroute_reg_vif_num = -1;
502#endif
503
504 if (vifi + 1 == net->ipv6.maxvif) {
505 int tmp;
506 for (tmp = vifi - 1; tmp >= 0; tmp--) {
507 if (MIF_EXISTS(net, tmp))
508 break;
509 }
510 net->ipv6.maxvif = tmp + 1;
511 }
512
513 write_unlock_bh(&mrt_lock);
514
515 dev_set_allmulti(dev, -1);
516
517 in6_dev = __in6_dev_get(dev);
518 if (in6_dev)
519 in6_dev->cnf.mc_forwarding--;
520
521 if (v->flags & MIFF_REGISTER)
522 unregister_netdevice(dev);
523
524 dev_put(dev);
525 return 0;
526}
527
528static inline void ip6mr_cache_free(struct mfc6_cache *c)
529{
530 release_net(mfc6_net(c));
531 kmem_cache_free(mrt_cachep, c);
532}
533
534/* Destroy an unresolved cache entry, killing queued skbs
535 and reporting error to netlink readers.
536 */
537
538static void ip6mr_destroy_unres(struct mfc6_cache *c)
539{
540 struct sk_buff *skb;
541 struct net *net = mfc6_net(c);
542
543 atomic_dec(&net->ipv6.cache_resolve_queue_len);
544
545 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
546 if (ipv6_hdr(skb)->version == 0) {
547 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
548 nlh->nlmsg_type = NLMSG_ERROR;
549 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
550 skb_trim(skb, nlh->nlmsg_len);
551 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT;
552 rtnl_unicast(skb, net, NETLINK_CB(skb).pid);
553 } else
554 kfree_skb(skb);
555 }
556
557 ip6mr_cache_free(c);
558}
559
560
561/* Single timer process for all the unresolved queue. */
562
563static void ipmr_do_expire_process(unsigned long dummy)
564{
565 unsigned long now = jiffies;
566 unsigned long expires = 10 * HZ;
567 struct mfc6_cache *c, **cp;
568
569 cp = &mfc_unres_queue;
570
571 while ((c = *cp) != NULL) {
572 if (time_after(c->mfc_un.unres.expires, now)) {
573 /* not yet... */
574 unsigned long interval = c->mfc_un.unres.expires - now;
575 if (interval < expires)
576 expires = interval;
577 cp = &c->next;
578 continue;
579 }
580
581 *cp = c->next;
582 ip6mr_destroy_unres(c);
583 }
584
585 if (mfc_unres_queue != NULL)
586 mod_timer(&ipmr_expire_timer, jiffies + expires);
587}
588
589static void ipmr_expire_process(unsigned long dummy)
590{
591 if (!spin_trylock(&mfc_unres_lock)) {
592 mod_timer(&ipmr_expire_timer, jiffies + 1);
593 return;
594 }
595
596 if (mfc_unres_queue != NULL)
597 ipmr_do_expire_process(dummy);
598
599 spin_unlock(&mfc_unres_lock);
600}
601
602/* Fill oifs list. It is called under write locked mrt_lock. */
603
604static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls)
605{
606 int vifi;
607 struct net *net = mfc6_net(cache);
608
609 cache->mfc_un.res.minvif = MAXMIFS;
610 cache->mfc_un.res.maxvif = 0;
611 memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
612
613 for (vifi = 0; vifi < net->ipv6.maxvif; vifi++) {
614 if (MIF_EXISTS(net, vifi) &&
615 ttls[vifi] && ttls[vifi] < 255) {
616 cache->mfc_un.res.ttls[vifi] = ttls[vifi];
617 if (cache->mfc_un.res.minvif > vifi)
618 cache->mfc_un.res.minvif = vifi;
619 if (cache->mfc_un.res.maxvif <= vifi)
620 cache->mfc_un.res.maxvif = vifi + 1;
621 }
622 }
623}
624
625static int mif6_add(struct net *net, struct mif6ctl *vifc, int mrtsock)
626{
627 int vifi = vifc->mif6c_mifi;
628 struct mif_device *v = &net->ipv6.vif6_table[vifi];
629 struct net_device *dev;
630 struct inet6_dev *in6_dev;
631 int err;
632
633 /* Is vif busy ? */
634 if (MIF_EXISTS(net, vifi))
635 return -EADDRINUSE;
636
637 switch (vifc->mif6c_flags) {
638#ifdef CONFIG_IPV6_PIMSM_V2
639 case MIFF_REGISTER:
640 /*
641 * Special Purpose VIF in PIM
642 * All the packets will be sent to the daemon
643 */
644 if (net->ipv6.mroute_reg_vif_num >= 0)
645 return -EADDRINUSE;
646 dev = ip6mr_reg_vif(net);
647 if (!dev)
648 return -ENOBUFS;
649 err = dev_set_allmulti(dev, 1);
650 if (err) {
651 unregister_netdevice(dev);
652 dev_put(dev);
653 return err;
654 }
655 break;
656#endif
657 case 0:
658 dev = dev_get_by_index(net, vifc->mif6c_pifi);
659 if (!dev)
660 return -EADDRNOTAVAIL;
661 err = dev_set_allmulti(dev, 1);
662 if (err) {
663 dev_put(dev);
664 return err;
665 }
666 break;
667 default:
668 return -EINVAL;
669 }
670
671 in6_dev = __in6_dev_get(dev);
672 if (in6_dev)
673 in6_dev->cnf.mc_forwarding++;
674
675 /*
676 * Fill in the VIF structures
677 */
678 v->rate_limit = vifc->vifc_rate_limit;
679 v->flags = vifc->mif6c_flags;
680 if (!mrtsock)
681 v->flags |= VIFF_STATIC;
682 v->threshold = vifc->vifc_threshold;
683 v->bytes_in = 0;
684 v->bytes_out = 0;
685 v->pkt_in = 0;
686 v->pkt_out = 0;
687 v->link = dev->ifindex;
688 if (v->flags & MIFF_REGISTER)
689 v->link = dev->iflink;
690
691 /* And finish update writing critical data */
692 write_lock_bh(&mrt_lock);
693 v->dev = dev;
694#ifdef CONFIG_IPV6_PIMSM_V2
695 if (v->flags & MIFF_REGISTER)
696 net->ipv6.mroute_reg_vif_num = vifi;
697#endif
698 if (vifi + 1 > net->ipv6.maxvif)
699 net->ipv6.maxvif = vifi + 1;
700 write_unlock_bh(&mrt_lock);
701 return 0;
702}
703
704static struct mfc6_cache *ip6mr_cache_find(struct net *net,
705 struct in6_addr *origin,
706 struct in6_addr *mcastgrp)
707{
708 int line = MFC6_HASH(mcastgrp, origin);
709 struct mfc6_cache *c;
710
711 for (c = net->ipv6.mfc6_cache_array[line]; c; c = c->next) {
712 if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
713 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
714 break;
715 }
716 return c;
717}
718
719/*
720 * Allocate a multicast cache entry
721 */
722static struct mfc6_cache *ip6mr_cache_alloc(struct net *net)
723{
724 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
725 if (c == NULL)
726 return NULL;
727 c->mfc_un.res.minvif = MAXMIFS;
728 mfc6_net_set(c, net);
729 return c;
730}
731
732static struct mfc6_cache *ip6mr_cache_alloc_unres(struct net *net)
733{
734 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
735 if (c == NULL)
736 return NULL;
737 skb_queue_head_init(&c->mfc_un.unres.unresolved);
738 c->mfc_un.unres.expires = jiffies + 10 * HZ;
739 mfc6_net_set(c, net);
740 return c;
741}
742
743/*
744 * A cache entry has gone into a resolved state from queued
745 */
746
747static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c)
748{
749 struct sk_buff *skb;
750
751 /*
752 * Play the pending entries through our router
753 */
754
755 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
756 if (ipv6_hdr(skb)->version == 0) {
757 int err;
758 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
759
760 if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) {
761 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
762 } else {
763 nlh->nlmsg_type = NLMSG_ERROR;
764 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
765 skb_trim(skb, nlh->nlmsg_len);
766 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE;
767 }
768 err = rtnl_unicast(skb, mfc6_net(uc), NETLINK_CB(skb).pid);
769 } else
770 ip6_mr_forward(skb, c);
771 }
772}
773
774/*
775 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
776 * expects the following bizarre scheme.
777 *
778 * Called under mrt_lock.
779 */
780
781static int ip6mr_cache_report(struct net *net, struct sk_buff *pkt, mifi_t mifi,
782 int assert)
783{
784 struct sk_buff *skb;
785 struct mrt6msg *msg;
786 int ret;
787
788#ifdef CONFIG_IPV6_PIMSM_V2
789 if (assert == MRT6MSG_WHOLEPKT)
790 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
791 +sizeof(*msg));
792 else
793#endif
794 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
795
796 if (!skb)
797 return -ENOBUFS;
798
799 /* I suppose that internal messages
800 * do not require checksums */
801
802 skb->ip_summed = CHECKSUM_UNNECESSARY;
803
804#ifdef CONFIG_IPV6_PIMSM_V2
805 if (assert == MRT6MSG_WHOLEPKT) {
806 /* Ugly, but we have no choice with this interface.
807 Duplicate old header, fix length etc.
808 And all this only to mangle msg->im6_msgtype and
809 to set msg->im6_mbz to "mbz" :-)
810 */
811 skb_push(skb, -skb_network_offset(pkt));
812
813 skb_push(skb, sizeof(*msg));
814 skb_reset_transport_header(skb);
815 msg = (struct mrt6msg *)skb_transport_header(skb);
816 msg->im6_mbz = 0;
817 msg->im6_msgtype = MRT6MSG_WHOLEPKT;
818 msg->im6_mif = net->ipv6.mroute_reg_vif_num;
819 msg->im6_pad = 0;
820 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
821 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
822
823 skb->ip_summed = CHECKSUM_UNNECESSARY;
824 } else
825#endif
826 {
827 /*
828 * Copy the IP header
829 */
830
831 skb_put(skb, sizeof(struct ipv6hdr));
832 skb_reset_network_header(skb);
833 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
834
835 /*
836 * Add our header
837 */
838 skb_put(skb, sizeof(*msg));
839 skb_reset_transport_header(skb);
840 msg = (struct mrt6msg *)skb_transport_header(skb);
841
842 msg->im6_mbz = 0;
843 msg->im6_msgtype = assert;
844 msg->im6_mif = mifi;
845 msg->im6_pad = 0;
846 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
847 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
848
849 skb_dst_set(skb, dst_clone(skb_dst(pkt)));
850 skb->ip_summed = CHECKSUM_UNNECESSARY;
851 }
852
853 if (net->ipv6.mroute6_sk == NULL) {
854 kfree_skb(skb);
855 return -EINVAL;
856 }
857
858 /*
859 * Deliver to user space multicast routing algorithms
860 */
861 ret = sock_queue_rcv_skb(net->ipv6.mroute6_sk, skb);
862 if (ret < 0) {
863 if (net_ratelimit())
864 printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n");
865 kfree_skb(skb);
866 }
867
868 return ret;
869}
870
871/*
872 * Queue a packet for resolution. It gets locked cache entry!
873 */
874
875static int
876ip6mr_cache_unresolved(struct net *net, mifi_t mifi, struct sk_buff *skb)
877{
878 int err;
879 struct mfc6_cache *c;
880
881 spin_lock_bh(&mfc_unres_lock);
882 for (c = mfc_unres_queue; c; c = c->next) {
883 if (net_eq(mfc6_net(c), net) &&
884 ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
885 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr))
886 break;
887 }
888
889 if (c == NULL) {
890 /*
891 * Create a new entry if allowable
892 */
893
894 if (atomic_read(&net->ipv6.cache_resolve_queue_len) >= 10 ||
895 (c = ip6mr_cache_alloc_unres(net)) == NULL) {
896 spin_unlock_bh(&mfc_unres_lock);
897
898 kfree_skb(skb);
899 return -ENOBUFS;
900 }
901
902 /*
903 * Fill in the new cache entry
904 */
905 c->mf6c_parent = -1;
906 c->mf6c_origin = ipv6_hdr(skb)->saddr;
907 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
908
909 /*
910 * Reflect first query at pim6sd
911 */
912 err = ip6mr_cache_report(net, skb, mifi, MRT6MSG_NOCACHE);
913 if (err < 0) {
914 /* If the report failed throw the cache entry
915 out - Brad Parker
916 */
917 spin_unlock_bh(&mfc_unres_lock);
918
919 ip6mr_cache_free(c);
920 kfree_skb(skb);
921 return err;
922 }
923
924 atomic_inc(&net->ipv6.cache_resolve_queue_len);
925 c->next = mfc_unres_queue;
926 mfc_unres_queue = c;
927
928 ipmr_do_expire_process(1);
929 }
930
931 /*
932 * See if we can append the packet
933 */
934 if (c->mfc_un.unres.unresolved.qlen > 3) {
935 kfree_skb(skb);
936 err = -ENOBUFS;
937 } else {
938 skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
939 err = 0;
940 }
941
942 spin_unlock_bh(&mfc_unres_lock);
943 return err;
944}
945
946/*
947 * MFC6 cache manipulation by user space
948 */
949
950static int ip6mr_mfc_delete(struct net *net, struct mf6cctl *mfc)
951{
952 int line;
953 struct mfc6_cache *c, **cp;
954
955 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
956
957 for (cp = &net->ipv6.mfc6_cache_array[line];
958 (c = *cp) != NULL; cp = &c->next) {
959 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
960 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) {
961 write_lock_bh(&mrt_lock);
962 *cp = c->next;
963 write_unlock_bh(&mrt_lock);
964
965 ip6mr_cache_free(c);
966 return 0;
967 }
968 }
969 return -ENOENT;
970}
971
972static int ip6mr_device_event(struct notifier_block *this,
973 unsigned long event, void *ptr)
974{
975 struct net_device *dev = ptr;
976 struct net *net = dev_net(dev);
977 struct mif_device *v;
978 int ct;
979
980 if (event != NETDEV_UNREGISTER)
981 return NOTIFY_DONE;
982
983 v = &net->ipv6.vif6_table[0];
984 for (ct = 0; ct < net->ipv6.maxvif; ct++, v++) {
985 if (v->dev == dev)
986 mif6_delete(net, ct);
987 }
988 return NOTIFY_DONE;
989}
990
991static struct notifier_block ip6_mr_notifier = {
992 .notifier_call = ip6mr_device_event
993};
994
995/*
996 * Setup for IP multicast routing
997 */
998
999static int __net_init ip6mr_net_init(struct net *net)
1000{
1001 int err = 0;
1002 net->ipv6.vif6_table = kcalloc(MAXMIFS, sizeof(struct mif_device),
1003 GFP_KERNEL);
1004 if (!net->ipv6.vif6_table) {
1005 err = -ENOMEM;
1006 goto fail;
1007 }
1008
1009 /* Forwarding cache */
1010 net->ipv6.mfc6_cache_array = kcalloc(MFC6_LINES,
1011 sizeof(struct mfc6_cache *),
1012 GFP_KERNEL);
1013 if (!net->ipv6.mfc6_cache_array) {
1014 err = -ENOMEM;
1015 goto fail_mfc6_cache;
1016 }
1017
1018#ifdef CONFIG_IPV6_PIMSM_V2
1019 net->ipv6.mroute_reg_vif_num = -1;
1020#endif
1021
1022#ifdef CONFIG_PROC_FS
1023 err = -ENOMEM;
1024 if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops))
1025 goto proc_vif_fail;
1026 if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops))
1027 goto proc_cache_fail;
1028#endif
1029 return 0;
1030
1031#ifdef CONFIG_PROC_FS
1032proc_cache_fail:
1033 proc_net_remove(net, "ip6_mr_vif");
1034proc_vif_fail:
1035 kfree(net->ipv6.mfc6_cache_array);
1036#endif
1037fail_mfc6_cache:
1038 kfree(net->ipv6.vif6_table);
1039fail:
1040 return err;
1041}
1042
1043static void __net_exit ip6mr_net_exit(struct net *net)
1044{
1045#ifdef CONFIG_PROC_FS
1046 proc_net_remove(net, "ip6_mr_cache");
1047 proc_net_remove(net, "ip6_mr_vif");
1048#endif
1049 mroute_clean_tables(net);
1050 kfree(net->ipv6.mfc6_cache_array);
1051 kfree(net->ipv6.vif6_table);
1052}
1053
1054static struct pernet_operations ip6mr_net_ops = {
1055 .init = ip6mr_net_init,
1056 .exit = ip6mr_net_exit,
1057};
1058
1059int __init ip6_mr_init(void)
1060{
1061 int err;
1062
1063 mrt_cachep = kmem_cache_create("ip6_mrt_cache",
1064 sizeof(struct mfc6_cache),
1065 0, SLAB_HWCACHE_ALIGN,
1066 NULL);
1067 if (!mrt_cachep)
1068 return -ENOMEM;
1069
1070 err = register_pernet_subsys(&ip6mr_net_ops);
1071 if (err)
1072 goto reg_pernet_fail;
1073
1074 setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0);
1075 err = register_netdevice_notifier(&ip6_mr_notifier);
1076 if (err)
1077 goto reg_notif_fail;
1078#ifdef CONFIG_IPV6_PIMSM_V2
1079 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
1080 printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n");
1081 err = -EAGAIN;
1082 goto add_proto_fail;
1083 }
1084#endif
1085 return 0;
1086#ifdef CONFIG_IPV6_PIMSM_V2
1087add_proto_fail:
1088 unregister_netdevice_notifier(&ip6_mr_notifier);
1089#endif
1090reg_notif_fail:
1091 del_timer(&ipmr_expire_timer);
1092 unregister_pernet_subsys(&ip6mr_net_ops);
1093reg_pernet_fail:
1094 kmem_cache_destroy(mrt_cachep);
1095 return err;
1096}
1097
1098void ip6_mr_cleanup(void)
1099{
1100 unregister_netdevice_notifier(&ip6_mr_notifier);
1101 del_timer(&ipmr_expire_timer);
1102 unregister_pernet_subsys(&ip6mr_net_ops);
1103 kmem_cache_destroy(mrt_cachep);
1104}
1105
1106static int ip6mr_mfc_add(struct net *net, struct mf6cctl *mfc, int mrtsock)
1107{
1108 int line;
1109 struct mfc6_cache *uc, *c, **cp;
1110 unsigned char ttls[MAXMIFS];
1111 int i;
1112
1113 memset(ttls, 255, MAXMIFS);
1114 for (i = 0; i < MAXMIFS; i++) {
1115 if (IF_ISSET(i, &mfc->mf6cc_ifset))
1116 ttls[i] = 1;
1117
1118 }
1119
1120 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
1121
1122 for (cp = &net->ipv6.mfc6_cache_array[line];
1123 (c = *cp) != NULL; cp = &c->next) {
1124 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
1125 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr))
1126 break;
1127 }
1128
1129 if (c != NULL) {
1130 write_lock_bh(&mrt_lock);
1131 c->mf6c_parent = mfc->mf6cc_parent;
1132 ip6mr_update_thresholds(c, ttls);
1133 if (!mrtsock)
1134 c->mfc_flags |= MFC_STATIC;
1135 write_unlock_bh(&mrt_lock);
1136 return 0;
1137 }
1138
1139 if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
1140 return -EINVAL;
1141
1142 c = ip6mr_cache_alloc(net);
1143 if (c == NULL)
1144 return -ENOMEM;
1145
1146 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
1147 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
1148 c->mf6c_parent = mfc->mf6cc_parent;
1149 ip6mr_update_thresholds(c, ttls);
1150 if (!mrtsock)
1151 c->mfc_flags |= MFC_STATIC;
1152
1153 write_lock_bh(&mrt_lock);
1154 c->next = net->ipv6.mfc6_cache_array[line];
1155 net->ipv6.mfc6_cache_array[line] = c;
1156 write_unlock_bh(&mrt_lock);
1157
1158 /*
1159 * Check to see if we resolved a queued list. If so we
1160 * need to send on the frames and tidy up.
1161 */
1162 spin_lock_bh(&mfc_unres_lock);
1163 for (cp = &mfc_unres_queue; (uc = *cp) != NULL;
1164 cp = &uc->next) {
1165 if (net_eq(mfc6_net(uc), net) &&
1166 ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
1167 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
1168 *cp = uc->next;
1169 atomic_dec(&net->ipv6.cache_resolve_queue_len);
1170 break;
1171 }
1172 }
1173 if (mfc_unres_queue == NULL)
1174 del_timer(&ipmr_expire_timer);
1175 spin_unlock_bh(&mfc_unres_lock);
1176
1177 if (uc) {
1178 ip6mr_cache_resolve(uc, c);
1179 ip6mr_cache_free(uc);
1180 }
1181 return 0;
1182}
1183
1184/*
1185 * Close the multicast socket, and clear the vif tables etc
1186 */
1187
1188static void mroute_clean_tables(struct net *net)
1189{
1190 int i;
1191
1192 /*
1193 * Shut down all active vif entries
1194 */
1195 for (i = 0; i < net->ipv6.maxvif; i++) {
1196 if (!(net->ipv6.vif6_table[i].flags & VIFF_STATIC))
1197 mif6_delete(net, i);
1198 }
1199
1200 /*
1201 * Wipe the cache
1202 */
1203 for (i = 0; i < MFC6_LINES; i++) {
1204 struct mfc6_cache *c, **cp;
1205
1206 cp = &net->ipv6.mfc6_cache_array[i];
1207 while ((c = *cp) != NULL) {
1208 if (c->mfc_flags & MFC_STATIC) {
1209 cp = &c->next;
1210 continue;
1211 }
1212 write_lock_bh(&mrt_lock);
1213 *cp = c->next;
1214 write_unlock_bh(&mrt_lock);
1215
1216 ip6mr_cache_free(c);
1217 }
1218 }
1219
1220 if (atomic_read(&net->ipv6.cache_resolve_queue_len) != 0) {
1221 struct mfc6_cache *c, **cp;
1222
1223 spin_lock_bh(&mfc_unres_lock);
1224 cp = &mfc_unres_queue;
1225 while ((c = *cp) != NULL) {
1226 if (!net_eq(mfc6_net(c), net)) {
1227 cp = &c->next;
1228 continue;
1229 }
1230 *cp = c->next;
1231 ip6mr_destroy_unres(c);
1232 }
1233 spin_unlock_bh(&mfc_unres_lock);
1234 }
1235}
1236
1237static int ip6mr_sk_init(struct sock *sk)
1238{
1239 int err = 0;
1240 struct net *net = sock_net(sk);
1241
1242 rtnl_lock();
1243 write_lock_bh(&mrt_lock);
1244 if (likely(net->ipv6.mroute6_sk == NULL)) {
1245 net->ipv6.mroute6_sk = sk;
1246 net->ipv6.devconf_all->mc_forwarding++;
1247 }
1248 else
1249 err = -EADDRINUSE;
1250 write_unlock_bh(&mrt_lock);
1251
1252 rtnl_unlock();
1253
1254 return err;
1255}
1256
1257int ip6mr_sk_done(struct sock *sk)
1258{
1259 int err = 0;
1260 struct net *net = sock_net(sk);
1261
1262 rtnl_lock();
1263 if (sk == net->ipv6.mroute6_sk) {
1264 write_lock_bh(&mrt_lock);
1265 net->ipv6.mroute6_sk = NULL;
1266 net->ipv6.devconf_all->mc_forwarding--;
1267 write_unlock_bh(&mrt_lock);
1268
1269 mroute_clean_tables(net);
1270 } else
1271 err = -EACCES;
1272 rtnl_unlock();
1273
1274 return err;
1275}
1276
1277/*
1278 * Socket options and virtual interface manipulation. The whole
1279 * virtual interface system is a complete heap, but unfortunately
1280 * that's how BSD mrouted happens to think. Maybe one day with a proper
1281 * MOSPF/PIM router set up we can clean this up.
1282 */
1283
1284int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
1285{
1286 int ret;
1287 struct mif6ctl vif;
1288 struct mf6cctl mfc;
1289 mifi_t mifi;
1290 struct net *net = sock_net(sk);
1291
1292 if (optname != MRT6_INIT) {
1293 if (sk != net->ipv6.mroute6_sk && !capable(CAP_NET_ADMIN))
1294 return -EACCES;
1295 }
1296
1297 switch (optname) {
1298 case MRT6_INIT:
1299 if (sk->sk_type != SOCK_RAW ||
1300 inet_sk(sk)->num != IPPROTO_ICMPV6)
1301 return -EOPNOTSUPP;
1302 if (optlen < sizeof(int))
1303 return -EINVAL;
1304
1305 return ip6mr_sk_init(sk);
1306
1307 case MRT6_DONE:
1308 return ip6mr_sk_done(sk);
1309
1310 case MRT6_ADD_MIF:
1311 if (optlen < sizeof(vif))
1312 return -EINVAL;
1313 if (copy_from_user(&vif, optval, sizeof(vif)))
1314 return -EFAULT;
1315 if (vif.mif6c_mifi >= MAXMIFS)
1316 return -ENFILE;
1317 rtnl_lock();
1318 ret = mif6_add(net, &vif, sk == net->ipv6.mroute6_sk);
1319 rtnl_unlock();
1320 return ret;
1321
1322 case MRT6_DEL_MIF:
1323 if (optlen < sizeof(mifi_t))
1324 return -EINVAL;
1325 if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
1326 return -EFAULT;
1327 rtnl_lock();
1328 ret = mif6_delete(net, mifi);
1329 rtnl_unlock();
1330 return ret;
1331
1332 /*
1333 * Manipulate the forwarding caches. These live
1334 * in a sort of kernel/user symbiosis.
1335 */
1336 case MRT6_ADD_MFC:
1337 case MRT6_DEL_MFC:
1338 if (optlen < sizeof(mfc))
1339 return -EINVAL;
1340 if (copy_from_user(&mfc, optval, sizeof(mfc)))
1341 return -EFAULT;
1342 rtnl_lock();
1343 if (optname == MRT6_DEL_MFC)
1344 ret = ip6mr_mfc_delete(net, &mfc);
1345 else
1346 ret = ip6mr_mfc_add(net, &mfc,
1347 sk == net->ipv6.mroute6_sk);
1348 rtnl_unlock();
1349 return ret;
1350
1351 /*
1352 * Control PIM assert (to activate pim will activate assert)
1353 */
1354 case MRT6_ASSERT:
1355 {
1356 int v;
1357 if (get_user(v, (int __user *)optval))
1358 return -EFAULT;
1359 net->ipv6.mroute_do_assert = !!v;
1360 return 0;
1361 }
1362
1363#ifdef CONFIG_IPV6_PIMSM_V2
1364 case MRT6_PIM:
1365 {
1366 int v;
1367 if (get_user(v, (int __user *)optval))
1368 return -EFAULT;
1369 v = !!v;
1370 rtnl_lock();
1371 ret = 0;
1372 if (v != net->ipv6.mroute_do_pim) {
1373 net->ipv6.mroute_do_pim = v;
1374 net->ipv6.mroute_do_assert = v;
1375 }
1376 rtnl_unlock();
1377 return ret;
1378 }
1379
1380#endif
1381 /*
1382 * Spurious command, or MRT6_VERSION which you cannot
1383 * set.
1384 */
1385 default:
1386 return -ENOPROTOOPT;
1387 }
1388}
1389
1390/*
1391 * Getsock opt support for the multicast routing system.
1392 */
1393
1394int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
1395 int __user *optlen)
1396{
1397 int olr;
1398 int val;
1399 struct net *net = sock_net(sk);
1400
1401 switch (optname) {
1402 case MRT6_VERSION:
1403 val = 0x0305;
1404 break;
1405#ifdef CONFIG_IPV6_PIMSM_V2
1406 case MRT6_PIM:
1407 val = net->ipv6.mroute_do_pim;
1408 break;
1409#endif
1410 case MRT6_ASSERT:
1411 val = net->ipv6.mroute_do_assert;
1412 break;
1413 default:
1414 return -ENOPROTOOPT;
1415 }
1416
1417 if (get_user(olr, optlen))
1418 return -EFAULT;
1419
1420 olr = min_t(int, olr, sizeof(int));
1421 if (olr < 0)
1422 return -EINVAL;
1423
1424 if (put_user(olr, optlen))
1425 return -EFAULT;
1426 if (copy_to_user(optval, &val, olr))
1427 return -EFAULT;
1428 return 0;
1429}
1430
1431/*
1432 * The IP multicast ioctl support routines.
1433 */
1434
1435int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
1436{
1437 struct sioc_sg_req6 sr;
1438 struct sioc_mif_req6 vr;
1439 struct mif_device *vif;
1440 struct mfc6_cache *c;
1441 struct net *net = sock_net(sk);
1442
1443 switch (cmd) {
1444 case SIOCGETMIFCNT_IN6:
1445 if (copy_from_user(&vr, arg, sizeof(vr)))
1446 return -EFAULT;
1447 if (vr.mifi >= net->ipv6.maxvif)
1448 return -EINVAL;
1449 read_lock(&mrt_lock);
1450 vif = &net->ipv6.vif6_table[vr.mifi];
1451 if (MIF_EXISTS(net, vr.mifi)) {
1452 vr.icount = vif->pkt_in;
1453 vr.ocount = vif->pkt_out;
1454 vr.ibytes = vif->bytes_in;
1455 vr.obytes = vif->bytes_out;
1456 read_unlock(&mrt_lock);
1457
1458 if (copy_to_user(arg, &vr, sizeof(vr)))
1459 return -EFAULT;
1460 return 0;
1461 }
1462 read_unlock(&mrt_lock);
1463 return -EADDRNOTAVAIL;
1464 case SIOCGETSGCNT_IN6:
1465 if (copy_from_user(&sr, arg, sizeof(sr)))
1466 return -EFAULT;
1467
1468 read_lock(&mrt_lock);
1469 c = ip6mr_cache_find(net, &sr.src.sin6_addr, &sr.grp.sin6_addr);
1470 if (c) {
1471 sr.pktcnt = c->mfc_un.res.pkt;
1472 sr.bytecnt = c->mfc_un.res.bytes;
1473 sr.wrong_if = c->mfc_un.res.wrong_if;
1474 read_unlock(&mrt_lock);
1475
1476 if (copy_to_user(arg, &sr, sizeof(sr)))
1477 return -EFAULT;
1478 return 0;
1479 }
1480 read_unlock(&mrt_lock);
1481 return -EADDRNOTAVAIL;
1482 default:
1483 return -ENOIOCTLCMD;
1484 }
1485}
1486
1487
1488static inline int ip6mr_forward2_finish(struct sk_buff *skb)
1489{
1490 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
1491 IPSTATS_MIB_OUTFORWDATAGRAMS);
1492 return dst_output(skb);
1493}
1494
1495/*
1496 * Processing handlers for ip6mr_forward
1497 */
1498
1499static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi)
1500{
1501 struct ipv6hdr *ipv6h;
1502 struct net *net = mfc6_net(c);
1503 struct mif_device *vif = &net->ipv6.vif6_table[vifi];
1504 struct net_device *dev;
1505 struct dst_entry *dst;
1506 struct flowi fl;
1507
1508 if (vif->dev == NULL)
1509 goto out_free;
1510
1511#ifdef CONFIG_IPV6_PIMSM_V2
1512 if (vif->flags & MIFF_REGISTER) {
1513 vif->pkt_out++;
1514 vif->bytes_out += skb->len;
1515 vif->dev->stats.tx_bytes += skb->len;
1516 vif->dev->stats.tx_packets++;
1517 ip6mr_cache_report(net, skb, vifi, MRT6MSG_WHOLEPKT);
1518 goto out_free;
1519 }
1520#endif
1521
1522 ipv6h = ipv6_hdr(skb);
1523
1524 fl = (struct flowi) {
1525 .oif = vif->link,
1526 .nl_u = { .ip6_u =
1527 { .daddr = ipv6h->daddr, }
1528 }
1529 };
1530
1531 dst = ip6_route_output(net, NULL, &fl);
1532 if (!dst)
1533 goto out_free;
1534
1535 skb_dst_drop(skb);
1536 skb_dst_set(skb, dst);
1537
1538 /*
1539 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
1540 * not only before forwarding, but after forwarding on all output
1541 * interfaces. It is clear, if mrouter runs a multicasting
1542 * program, it should receive packets not depending to what interface
1543 * program is joined.
1544 * If we will not make it, the program will have to join on all
1545 * interfaces. On the other hand, multihoming host (or router, but
1546 * not mrouter) cannot join to more than one interface - it will
1547 * result in receiving multiple packets.
1548 */
1549 dev = vif->dev;
1550 skb->dev = dev;
1551 vif->pkt_out++;
1552 vif->bytes_out += skb->len;
1553
1554 /* We are about to write */
1555 /* XXX: extension headers? */
1556 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
1557 goto out_free;
1558
1559 ipv6h = ipv6_hdr(skb);
1560 ipv6h->hop_limit--;
1561
1562 IP6CB(skb)->flags |= IP6SKB_FORWARDED;
1563
1564 return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev,
1565 ip6mr_forward2_finish);
1566
1567out_free:
1568 kfree_skb(skb);
1569 return 0;
1570}
1571
1572static int ip6mr_find_vif(struct net_device *dev)
1573{
1574 struct net *net = dev_net(dev);
1575 int ct;
1576 for (ct = net->ipv6.maxvif - 1; ct >= 0; ct--) {
1577 if (net->ipv6.vif6_table[ct].dev == dev)
1578 break;
1579 }
1580 return ct;
1581}
1582
1583static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache)
1584{
1585 int psend = -1;
1586 int vif, ct;
1587 struct net *net = mfc6_net(cache);
1588
1589 vif = cache->mf6c_parent;
1590 cache->mfc_un.res.pkt++;
1591 cache->mfc_un.res.bytes += skb->len;
1592
1593 /*
1594 * Wrong interface: drop packet and (maybe) send PIM assert.
1595 */
1596 if (net->ipv6.vif6_table[vif].dev != skb->dev) {
1597 int true_vifi;
1598
1599 cache->mfc_un.res.wrong_if++;
1600 true_vifi = ip6mr_find_vif(skb->dev);
1601
1602 if (true_vifi >= 0 && net->ipv6.mroute_do_assert &&
1603 /* pimsm uses asserts, when switching from RPT to SPT,
1604 so that we cannot check that packet arrived on an oif.
1605 It is bad, but otherwise we would need to move pretty
1606 large chunk of pimd to kernel. Ough... --ANK
1607 */
1608 (net->ipv6.mroute_do_pim ||
1609 cache->mfc_un.res.ttls[true_vifi] < 255) &&
1610 time_after(jiffies,
1611 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
1612 cache->mfc_un.res.last_assert = jiffies;
1613 ip6mr_cache_report(net, skb, true_vifi, MRT6MSG_WRONGMIF);
1614 }
1615 goto dont_forward;
1616 }
1617
1618 net->ipv6.vif6_table[vif].pkt_in++;
1619 net->ipv6.vif6_table[vif].bytes_in += skb->len;
1620
1621 /*
1622 * Forward the frame
1623 */
1624 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
1625 if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
1626 if (psend != -1) {
1627 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1628 if (skb2)
1629 ip6mr_forward2(skb2, cache, psend);
1630 }
1631 psend = ct;
1632 }
1633 }
1634 if (psend != -1) {
1635 ip6mr_forward2(skb, cache, psend);
1636 return 0;
1637 }
1638
1639dont_forward:
1640 kfree_skb(skb);
1641 return 0;
1642}
1643
1644
1645/*
1646 * Multicast packets for forwarding arrive here
1647 */
1648
1649int ip6_mr_input(struct sk_buff *skb)
1650{
1651 struct mfc6_cache *cache;
1652 struct net *net = dev_net(skb->dev);
1653
1654 read_lock(&mrt_lock);
1655 cache = ip6mr_cache_find(net,
1656 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
1657
1658 /*
1659 * No usable cache entry
1660 */
1661 if (cache == NULL) {
1662 int vif;
1663
1664 vif = ip6mr_find_vif(skb->dev);
1665 if (vif >= 0) {
1666 int err = ip6mr_cache_unresolved(net, vif, skb);
1667 read_unlock(&mrt_lock);
1668
1669 return err;
1670 }
1671 read_unlock(&mrt_lock);
1672 kfree_skb(skb);
1673 return -ENODEV;
1674 }
1675
1676 ip6_mr_forward(skb, cache);
1677
1678 read_unlock(&mrt_lock);
1679
1680 return 0;
1681}
1682
1683
1684static int
1685ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm)
1686{
1687 int ct;
1688 struct rtnexthop *nhp;
1689 struct net *net = mfc6_net(c);
1690 struct net_device *dev = net->ipv6.vif6_table[c->mf6c_parent].dev;
1691 u8 *b = skb_tail_pointer(skb);
1692 struct rtattr *mp_head;
1693
1694 if (dev)
1695 RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex);
1696
1697 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0));
1698
1699 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
1700 if (c->mfc_un.res.ttls[ct] < 255) {
1701 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
1702 goto rtattr_failure;
1703 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
1704 nhp->rtnh_flags = 0;
1705 nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
1706 nhp->rtnh_ifindex = net->ipv6.vif6_table[ct].dev->ifindex;
1707 nhp->rtnh_len = sizeof(*nhp);
1708 }
1709 }
1710 mp_head->rta_type = RTA_MULTIPATH;
1711 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head;
1712 rtm->rtm_type = RTN_MULTICAST;
1713 return 1;
1714
1715rtattr_failure:
1716 nlmsg_trim(skb, b);
1717 return -EMSGSIZE;
1718}
1719
1720int ip6mr_get_route(struct net *net,
1721 struct sk_buff *skb, struct rtmsg *rtm, int nowait)
1722{
1723 int err;
1724 struct mfc6_cache *cache;
1725 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
1726
1727 read_lock(&mrt_lock);
1728 cache = ip6mr_cache_find(net, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
1729
1730 if (!cache) {
1731 struct sk_buff *skb2;
1732 struct ipv6hdr *iph;
1733 struct net_device *dev;
1734 int vif;
1735
1736 if (nowait) {
1737 read_unlock(&mrt_lock);
1738 return -EAGAIN;
1739 }
1740
1741 dev = skb->dev;
1742 if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) {
1743 read_unlock(&mrt_lock);
1744 return -ENODEV;
1745 }
1746
1747 /* really correct? */
1748 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
1749 if (!skb2) {
1750 read_unlock(&mrt_lock);
1751 return -ENOMEM;
1752 }
1753
1754 skb_reset_transport_header(skb2);
1755
1756 skb_put(skb2, sizeof(struct ipv6hdr));
1757 skb_reset_network_header(skb2);
1758
1759 iph = ipv6_hdr(skb2);
1760 iph->version = 0;
1761 iph->priority = 0;
1762 iph->flow_lbl[0] = 0;
1763 iph->flow_lbl[1] = 0;
1764 iph->flow_lbl[2] = 0;
1765 iph->payload_len = 0;
1766 iph->nexthdr = IPPROTO_NONE;
1767 iph->hop_limit = 0;
1768 ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr);
1769 ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr);
1770
1771 err = ip6mr_cache_unresolved(net, vif, skb2);
1772 read_unlock(&mrt_lock);
1773
1774 return err;
1775 }
1776
1777 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
1778 cache->mfc_flags |= MFC_NOTIFY;
1779
1780 err = ip6mr_fill_mroute(skb, cache, rtm);
1781 read_unlock(&mrt_lock);
1782 return err;
1783}
1784
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