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Commit | Line | Data |
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7bc570c8 YH |
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> | |
7bc570c8 YH |
30 | #include <linux/inet.h> |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/inetdevice.h> | |
7bc570c8 YH |
33 | #include <linux/proc_fs.h> |
34 | #include <linux/seq_file.h> | |
7bc570c8 | 35 | #include <linux/init.h> |
7bc570c8 YH |
36 | #include <net/protocol.h> |
37 | #include <linux/skbuff.h> | |
38 | #include <net/sock.h> | |
7bc570c8 | 39 | #include <net/raw.h> |
7bc570c8 YH |
40 | #include <linux/notifier.h> |
41 | #include <linux/if_arp.h> | |
7bc570c8 YH |
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> | |
14fb64e1 | 48 | #include <linux/pim.h> |
7bc570c8 YH |
49 | #include <net/addrconf.h> |
50 | #include <linux/netfilter_ipv6.h> | |
51 | ||
52 | struct sock *mroute6_socket; | |
53 | ||
54 | ||
55 | /* Big lock, protecting vif table, mrt cache and mroute socket state. | |
56 | Note that the changes are semaphored via rtnl_lock. | |
57 | */ | |
58 | ||
59 | static DEFINE_RWLOCK(mrt_lock); | |
60 | ||
61 | /* | |
62 | * Multicast router control variables | |
63 | */ | |
64 | ||
65 | static struct mif_device vif6_table[MAXMIFS]; /* Devices */ | |
66 | static int maxvif; | |
67 | ||
68 | #define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL) | |
69 | ||
14fb64e1 YH |
70 | static int mroute_do_assert; /* Set in PIM assert */ |
71 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
72 | static int mroute_do_pim; | |
73 | #else | |
74 | #define mroute_do_pim 0 | |
75 | #endif | |
76 | ||
6ac7eb08 | 77 | static struct mfc6_cache *mfc6_cache_array[MFC6_LINES]; /* Forwarding cache */ |
7bc570c8 YH |
78 | |
79 | static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */ | |
80 | static atomic_t cache_resolve_queue_len; /* Size of unresolved */ | |
81 | ||
82 | /* Special spinlock for queue of unresolved entries */ | |
83 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
84 | ||
85 | /* We return to original Alan's scheme. Hash table of resolved | |
86 | entries is changed only in process context and protected | |
87 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
88 | with strong spinlock mfc_unres_lock. | |
89 | ||
90 | In this case data path is free of exclusive locks at all. | |
91 | */ | |
92 | ||
93 | static struct kmem_cache *mrt_cachep __read_mostly; | |
94 | ||
95 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache); | |
6ac7eb08 | 96 | static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert); |
7bc570c8 YH |
97 | static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm); |
98 | ||
14fb64e1 YH |
99 | #ifdef CONFIG_IPV6_PIMSM_V2 |
100 | static struct inet6_protocol pim6_protocol; | |
101 | #endif | |
102 | ||
7bc570c8 YH |
103 | static struct timer_list ipmr_expire_timer; |
104 | ||
105 | ||
106 | #ifdef CONFIG_PROC_FS | |
107 | ||
108 | struct ipmr_mfc_iter { | |
109 | struct mfc6_cache **cache; | |
110 | int ct; | |
111 | }; | |
112 | ||
113 | ||
114 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct ipmr_mfc_iter *it, loff_t pos) | |
115 | { | |
116 | struct mfc6_cache *mfc; | |
117 | ||
118 | it->cache = mfc6_cache_array; | |
119 | read_lock(&mrt_lock); | |
120 | for (it->ct = 0; it->ct < ARRAY_SIZE(mfc6_cache_array); it->ct++) | |
121 | for (mfc = mfc6_cache_array[it->ct]; mfc; mfc = mfc->next) | |
122 | if (pos-- == 0) | |
123 | return mfc; | |
124 | read_unlock(&mrt_lock); | |
125 | ||
126 | it->cache = &mfc_unres_queue; | |
127 | spin_lock_bh(&mfc_unres_lock); | |
128 | for (mfc = mfc_unres_queue; mfc; mfc = mfc->next) | |
129 | if (pos-- == 0) | |
130 | return mfc; | |
131 | spin_unlock_bh(&mfc_unres_lock); | |
132 | ||
133 | it->cache = NULL; | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | ||
138 | ||
139 | ||
140 | /* | |
141 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
142 | */ | |
143 | ||
144 | struct ipmr_vif_iter { | |
145 | int ct; | |
146 | }; | |
147 | ||
148 | static struct mif_device *ip6mr_vif_seq_idx(struct ipmr_vif_iter *iter, | |
149 | loff_t pos) | |
150 | { | |
151 | for (iter->ct = 0; iter->ct < maxvif; ++iter->ct) { | |
152 | if (!MIF_EXISTS(iter->ct)) | |
153 | continue; | |
154 | if (pos-- == 0) | |
155 | return &vif6_table[iter->ct]; | |
156 | } | |
157 | return NULL; | |
158 | } | |
159 | ||
160 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
161 | __acquires(mrt_lock) | |
162 | { | |
163 | read_lock(&mrt_lock); | |
164 | return (*pos ? ip6mr_vif_seq_idx(seq->private, *pos - 1) | |
165 | : SEQ_START_TOKEN); | |
166 | } | |
167 | ||
168 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
169 | { | |
170 | struct ipmr_vif_iter *iter = seq->private; | |
171 | ||
172 | ++*pos; | |
173 | if (v == SEQ_START_TOKEN) | |
174 | return ip6mr_vif_seq_idx(iter, 0); | |
175 | ||
176 | while (++iter->ct < maxvif) { | |
177 | if (!MIF_EXISTS(iter->ct)) | |
178 | continue; | |
179 | return &vif6_table[iter->ct]; | |
180 | } | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
185 | __releases(mrt_lock) | |
186 | { | |
187 | read_unlock(&mrt_lock); | |
188 | } | |
189 | ||
190 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
191 | { | |
192 | if (v == SEQ_START_TOKEN) { | |
193 | seq_puts(seq, | |
194 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
195 | } else { | |
196 | const struct mif_device *vif = v; | |
197 | const char *name = vif->dev ? vif->dev->name : "none"; | |
198 | ||
199 | seq_printf(seq, | |
d430a227 | 200 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
7bc570c8 YH |
201 | vif - vif6_table, |
202 | name, vif->bytes_in, vif->pkt_in, | |
203 | vif->bytes_out, vif->pkt_out, | |
204 | vif->flags); | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static struct seq_operations ip6mr_vif_seq_ops = { | |
210 | .start = ip6mr_vif_seq_start, | |
211 | .next = ip6mr_vif_seq_next, | |
212 | .stop = ip6mr_vif_seq_stop, | |
213 | .show = ip6mr_vif_seq_show, | |
214 | }; | |
215 | ||
216 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
217 | { | |
218 | return seq_open_private(file, &ip6mr_vif_seq_ops, | |
219 | sizeof(struct ipmr_vif_iter)); | |
220 | } | |
221 | ||
222 | static struct file_operations ip6mr_vif_fops = { | |
223 | .owner = THIS_MODULE, | |
224 | .open = ip6mr_vif_open, | |
225 | .read = seq_read, | |
226 | .llseek = seq_lseek, | |
eedd726e | 227 | .release = seq_release_private, |
7bc570c8 YH |
228 | }; |
229 | ||
230 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
231 | { | |
232 | return (*pos ? ipmr_mfc_seq_idx(seq->private, *pos - 1) | |
233 | : SEQ_START_TOKEN); | |
234 | } | |
235 | ||
236 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
237 | { | |
238 | struct mfc6_cache *mfc = v; | |
239 | struct ipmr_mfc_iter *it = seq->private; | |
240 | ||
241 | ++*pos; | |
242 | ||
243 | if (v == SEQ_START_TOKEN) | |
244 | return ipmr_mfc_seq_idx(seq->private, 0); | |
245 | ||
246 | if (mfc->next) | |
247 | return mfc->next; | |
248 | ||
249 | if (it->cache == &mfc_unres_queue) | |
250 | goto end_of_list; | |
251 | ||
252 | BUG_ON(it->cache != mfc6_cache_array); | |
253 | ||
254 | while (++it->ct < ARRAY_SIZE(mfc6_cache_array)) { | |
255 | mfc = mfc6_cache_array[it->ct]; | |
256 | if (mfc) | |
257 | return mfc; | |
258 | } | |
259 | ||
260 | /* exhausted cache_array, show unresolved */ | |
261 | read_unlock(&mrt_lock); | |
262 | it->cache = &mfc_unres_queue; | |
263 | it->ct = 0; | |
264 | ||
265 | spin_lock_bh(&mfc_unres_lock); | |
266 | mfc = mfc_unres_queue; | |
267 | if (mfc) | |
268 | return mfc; | |
269 | ||
270 | end_of_list: | |
271 | spin_unlock_bh(&mfc_unres_lock); | |
272 | it->cache = NULL; | |
273 | ||
274 | return NULL; | |
275 | } | |
276 | ||
277 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
278 | { | |
279 | struct ipmr_mfc_iter *it = seq->private; | |
280 | ||
281 | if (it->cache == &mfc_unres_queue) | |
282 | spin_unlock_bh(&mfc_unres_lock); | |
283 | else if (it->cache == mfc6_cache_array) | |
284 | read_unlock(&mrt_lock); | |
285 | } | |
286 | ||
287 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
288 | { | |
289 | int n; | |
290 | ||
291 | if (v == SEQ_START_TOKEN) { | |
292 | seq_puts(seq, | |
293 | "Group " | |
294 | "Origin " | |
295 | "Iif Pkts Bytes Wrong Oifs\n"); | |
296 | } else { | |
297 | const struct mfc6_cache *mfc = v; | |
298 | const struct ipmr_mfc_iter *it = seq->private; | |
299 | ||
300 | seq_printf(seq, | |
301 | NIP6_FMT " " NIP6_FMT " %-3d %8ld %8ld %8ld", | |
302 | NIP6(mfc->mf6c_mcastgrp), NIP6(mfc->mf6c_origin), | |
303 | mfc->mf6c_parent, | |
304 | mfc->mfc_un.res.pkt, | |
305 | mfc->mfc_un.res.bytes, | |
306 | mfc->mfc_un.res.wrong_if); | |
307 | ||
308 | if (it->cache != &mfc_unres_queue) { | |
309 | for (n = mfc->mfc_un.res.minvif; | |
310 | n < mfc->mfc_un.res.maxvif; n++) { | |
311 | if (MIF_EXISTS(n) && | |
312 | mfc->mfc_un.res.ttls[n] < 255) | |
313 | seq_printf(seq, | |
314 | " %2d:%-3d", | |
315 | n, mfc->mfc_un.res.ttls[n]); | |
316 | } | |
317 | } | |
318 | seq_putc(seq, '\n'); | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static struct seq_operations ipmr_mfc_seq_ops = { | |
324 | .start = ipmr_mfc_seq_start, | |
325 | .next = ipmr_mfc_seq_next, | |
326 | .stop = ipmr_mfc_seq_stop, | |
327 | .show = ipmr_mfc_seq_show, | |
328 | }; | |
329 | ||
330 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
331 | { | |
332 | return seq_open_private(file, &ipmr_mfc_seq_ops, | |
333 | sizeof(struct ipmr_mfc_iter)); | |
334 | } | |
335 | ||
336 | static struct file_operations ip6mr_mfc_fops = { | |
337 | .owner = THIS_MODULE, | |
338 | .open = ipmr_mfc_open, | |
339 | .read = seq_read, | |
340 | .llseek = seq_lseek, | |
eedd726e | 341 | .release = seq_release_private, |
7bc570c8 YH |
342 | }; |
343 | #endif | |
344 | ||
14fb64e1 YH |
345 | #ifdef CONFIG_IPV6_PIMSM_V2 |
346 | static int reg_vif_num = -1; | |
347 | ||
348 | static int pim6_rcv(struct sk_buff *skb) | |
349 | { | |
350 | struct pimreghdr *pim; | |
351 | struct ipv6hdr *encap; | |
352 | struct net_device *reg_dev = NULL; | |
353 | ||
354 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
355 | goto drop; | |
356 | ||
357 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
358 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
359 | (pim->flags & PIM_NULL_REGISTER) || | |
360 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && | |
ec6b486f | 361 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
362 | goto drop; |
363 | ||
364 | /* check if the inner packet is destined to mcast group */ | |
365 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
366 | sizeof(*pim)); | |
367 | ||
368 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
369 | encap->payload_len == 0 || | |
370 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
371 | goto drop; | |
372 | ||
373 | read_lock(&mrt_lock); | |
374 | if (reg_vif_num >= 0) | |
375 | reg_dev = vif6_table[reg_vif_num].dev; | |
376 | if (reg_dev) | |
377 | dev_hold(reg_dev); | |
378 | read_unlock(&mrt_lock); | |
379 | ||
380 | if (reg_dev == NULL) | |
381 | goto drop; | |
382 | ||
383 | skb->mac_header = skb->network_header; | |
384 | skb_pull(skb, (u8 *)encap - skb->data); | |
385 | skb_reset_network_header(skb); | |
386 | skb->dev = reg_dev; | |
387 | skb->protocol = htons(ETH_P_IP); | |
388 | skb->ip_summed = 0; | |
389 | skb->pkt_type = PACKET_HOST; | |
390 | dst_release(skb->dst); | |
dc58c78c PE |
391 | reg_dev->stats.rx_bytes += skb->len; |
392 | reg_dev->stats.rx_packets++; | |
14fb64e1 YH |
393 | skb->dst = NULL; |
394 | nf_reset(skb); | |
395 | netif_rx(skb); | |
396 | dev_put(reg_dev); | |
397 | return 0; | |
398 | drop: | |
399 | kfree_skb(skb); | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static struct inet6_protocol pim6_protocol = { | |
404 | .handler = pim6_rcv, | |
405 | }; | |
406 | ||
407 | /* Service routines creating virtual interfaces: PIMREG */ | |
408 | ||
409 | static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) | |
410 | { | |
411 | read_lock(&mrt_lock); | |
dc58c78c PE |
412 | dev->stats.tx_bytes += skb->len; |
413 | dev->stats.tx_packets++; | |
14fb64e1 YH |
414 | ip6mr_cache_report(skb, reg_vif_num, MRT6MSG_WHOLEPKT); |
415 | read_unlock(&mrt_lock); | |
416 | kfree_skb(skb); | |
417 | return 0; | |
418 | } | |
419 | ||
14fb64e1 YH |
420 | static void reg_vif_setup(struct net_device *dev) |
421 | { | |
422 | dev->type = ARPHRD_PIMREG; | |
423 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
424 | dev->flags = IFF_NOARP; | |
425 | dev->hard_start_xmit = reg_vif_xmit; | |
14fb64e1 YH |
426 | dev->destructor = free_netdev; |
427 | } | |
428 | ||
429 | static struct net_device *ip6mr_reg_vif(void) | |
430 | { | |
431 | struct net_device *dev; | |
14fb64e1 | 432 | |
dc58c78c | 433 | dev = alloc_netdev(0, "pim6reg", reg_vif_setup); |
14fb64e1 YH |
434 | if (dev == NULL) |
435 | return NULL; | |
436 | ||
437 | if (register_netdevice(dev)) { | |
438 | free_netdev(dev); | |
439 | return NULL; | |
440 | } | |
441 | dev->iflink = 0; | |
442 | ||
14fb64e1 YH |
443 | if (dev_open(dev)) |
444 | goto failure; | |
445 | ||
7af3db78 | 446 | dev_hold(dev); |
14fb64e1 YH |
447 | return dev; |
448 | ||
449 | failure: | |
450 | /* allow the register to be completed before unregistering. */ | |
451 | rtnl_unlock(); | |
452 | rtnl_lock(); | |
453 | ||
454 | unregister_netdevice(dev); | |
455 | return NULL; | |
456 | } | |
457 | #endif | |
458 | ||
7bc570c8 YH |
459 | /* |
460 | * Delete a VIF entry | |
461 | */ | |
462 | ||
463 | static int mif6_delete(int vifi) | |
464 | { | |
465 | struct mif_device *v; | |
466 | struct net_device *dev; | |
467 | if (vifi < 0 || vifi >= maxvif) | |
468 | return -EADDRNOTAVAIL; | |
469 | ||
470 | v = &vif6_table[vifi]; | |
471 | ||
472 | write_lock_bh(&mrt_lock); | |
473 | dev = v->dev; | |
474 | v->dev = NULL; | |
475 | ||
476 | if (!dev) { | |
477 | write_unlock_bh(&mrt_lock); | |
478 | return -EADDRNOTAVAIL; | |
479 | } | |
480 | ||
14fb64e1 YH |
481 | #ifdef CONFIG_IPV6_PIMSM_V2 |
482 | if (vifi == reg_vif_num) | |
483 | reg_vif_num = -1; | |
484 | #endif | |
485 | ||
7bc570c8 YH |
486 | if (vifi + 1 == maxvif) { |
487 | int tmp; | |
488 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
489 | if (MIF_EXISTS(tmp)) | |
490 | break; | |
491 | } | |
492 | maxvif = tmp + 1; | |
493 | } | |
494 | ||
495 | write_unlock_bh(&mrt_lock); | |
496 | ||
497 | dev_set_allmulti(dev, -1); | |
498 | ||
499 | if (v->flags & MIFF_REGISTER) | |
500 | unregister_netdevice(dev); | |
501 | ||
502 | dev_put(dev); | |
503 | return 0; | |
504 | } | |
505 | ||
506 | /* Destroy an unresolved cache entry, killing queued skbs | |
507 | and reporting error to netlink readers. | |
508 | */ | |
509 | ||
510 | static void ip6mr_destroy_unres(struct mfc6_cache *c) | |
511 | { | |
512 | struct sk_buff *skb; | |
513 | ||
514 | atomic_dec(&cache_resolve_queue_len); | |
515 | ||
516 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
517 | if (ipv6_hdr(skb)->version == 0) { | |
518 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
519 | nlh->nlmsg_type = NLMSG_ERROR; | |
520 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
521 | skb_trim(skb, nlh->nlmsg_len); | |
522 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
523 | rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); | |
524 | } else | |
525 | kfree_skb(skb); | |
526 | } | |
527 | ||
528 | kmem_cache_free(mrt_cachep, c); | |
529 | } | |
530 | ||
531 | ||
532 | /* Single timer process for all the unresolved queue. */ | |
533 | ||
534 | static void ipmr_do_expire_process(unsigned long dummy) | |
535 | { | |
536 | unsigned long now = jiffies; | |
537 | unsigned long expires = 10 * HZ; | |
538 | struct mfc6_cache *c, **cp; | |
539 | ||
540 | cp = &mfc_unres_queue; | |
541 | ||
542 | while ((c = *cp) != NULL) { | |
543 | if (time_after(c->mfc_un.unres.expires, now)) { | |
544 | /* not yet... */ | |
545 | unsigned long interval = c->mfc_un.unres.expires - now; | |
546 | if (interval < expires) | |
547 | expires = interval; | |
548 | cp = &c->next; | |
549 | continue; | |
550 | } | |
551 | ||
552 | *cp = c->next; | |
553 | ip6mr_destroy_unres(c); | |
554 | } | |
555 | ||
556 | if (atomic_read(&cache_resolve_queue_len)) | |
557 | mod_timer(&ipmr_expire_timer, jiffies + expires); | |
558 | } | |
559 | ||
560 | static void ipmr_expire_process(unsigned long dummy) | |
561 | { | |
562 | if (!spin_trylock(&mfc_unres_lock)) { | |
563 | mod_timer(&ipmr_expire_timer, jiffies + 1); | |
564 | return; | |
565 | } | |
566 | ||
567 | if (atomic_read(&cache_resolve_queue_len)) | |
568 | ipmr_do_expire_process(dummy); | |
569 | ||
570 | spin_unlock(&mfc_unres_lock); | |
571 | } | |
572 | ||
573 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
574 | ||
575 | static void ip6mr_update_thresholds(struct mfc6_cache *cache, unsigned char *ttls) | |
576 | { | |
577 | int vifi; | |
578 | ||
6ac7eb08 | 579 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 580 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 581 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 YH |
582 | |
583 | for (vifi = 0; vifi < maxvif; vifi++) { | |
584 | if (MIF_EXISTS(vifi) && ttls[vifi] && ttls[vifi] < 255) { | |
585 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; | |
586 | if (cache->mfc_un.res.minvif > vifi) | |
587 | cache->mfc_un.res.minvif = vifi; | |
588 | if (cache->mfc_un.res.maxvif <= vifi) | |
589 | cache->mfc_un.res.maxvif = vifi + 1; | |
590 | } | |
591 | } | |
592 | } | |
593 | ||
594 | static int mif6_add(struct mif6ctl *vifc, int mrtsock) | |
595 | { | |
596 | int vifi = vifc->mif6c_mifi; | |
597 | struct mif_device *v = &vif6_table[vifi]; | |
598 | struct net_device *dev; | |
5ae7b444 | 599 | int err; |
7bc570c8 YH |
600 | |
601 | /* Is vif busy ? */ | |
602 | if (MIF_EXISTS(vifi)) | |
603 | return -EADDRINUSE; | |
604 | ||
605 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
606 | #ifdef CONFIG_IPV6_PIMSM_V2 |
607 | case MIFF_REGISTER: | |
608 | /* | |
609 | * Special Purpose VIF in PIM | |
610 | * All the packets will be sent to the daemon | |
611 | */ | |
612 | if (reg_vif_num >= 0) | |
613 | return -EADDRINUSE; | |
614 | dev = ip6mr_reg_vif(); | |
615 | if (!dev) | |
616 | return -ENOBUFS; | |
5ae7b444 WC |
617 | err = dev_set_allmulti(dev, 1); |
618 | if (err) { | |
619 | unregister_netdevice(dev); | |
7af3db78 | 620 | dev_put(dev); |
5ae7b444 WC |
621 | return err; |
622 | } | |
14fb64e1 YH |
623 | break; |
624 | #endif | |
7bc570c8 YH |
625 | case 0: |
626 | dev = dev_get_by_index(&init_net, vifc->mif6c_pifi); | |
627 | if (!dev) | |
628 | return -EADDRNOTAVAIL; | |
5ae7b444 | 629 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
630 | if (err) { |
631 | dev_put(dev); | |
5ae7b444 | 632 | return err; |
7af3db78 | 633 | } |
7bc570c8 YH |
634 | break; |
635 | default: | |
636 | return -EINVAL; | |
637 | } | |
638 | ||
7bc570c8 YH |
639 | /* |
640 | * Fill in the VIF structures | |
641 | */ | |
642 | v->rate_limit = vifc->vifc_rate_limit; | |
643 | v->flags = vifc->mif6c_flags; | |
644 | if (!mrtsock) | |
645 | v->flags |= VIFF_STATIC; | |
646 | v->threshold = vifc->vifc_threshold; | |
647 | v->bytes_in = 0; | |
648 | v->bytes_out = 0; | |
649 | v->pkt_in = 0; | |
650 | v->pkt_out = 0; | |
651 | v->link = dev->ifindex; | |
652 | if (v->flags & MIFF_REGISTER) | |
653 | v->link = dev->iflink; | |
654 | ||
655 | /* And finish update writing critical data */ | |
656 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 657 | v->dev = dev; |
14fb64e1 YH |
658 | #ifdef CONFIG_IPV6_PIMSM_V2 |
659 | if (v->flags & MIFF_REGISTER) | |
660 | reg_vif_num = vifi; | |
661 | #endif | |
7bc570c8 YH |
662 | if (vifi + 1 > maxvif) |
663 | maxvif = vifi + 1; | |
664 | write_unlock_bh(&mrt_lock); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static struct mfc6_cache *ip6mr_cache_find(struct in6_addr *origin, struct in6_addr *mcastgrp) | |
669 | { | |
670 | int line = MFC6_HASH(mcastgrp, origin); | |
671 | struct mfc6_cache *c; | |
672 | ||
673 | for (c = mfc6_cache_array[line]; c; c = c->next) { | |
674 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && | |
675 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
676 | break; | |
677 | } | |
678 | return c; | |
679 | } | |
680 | ||
681 | /* | |
682 | * Allocate a multicast cache entry | |
683 | */ | |
684 | static struct mfc6_cache *ip6mr_cache_alloc(void) | |
685 | { | |
686 | struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_KERNEL); | |
687 | if (c == NULL) | |
688 | return NULL; | |
689 | memset(c, 0, sizeof(*c)); | |
6ac7eb08 | 690 | c->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 YH |
691 | return c; |
692 | } | |
693 | ||
694 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) | |
695 | { | |
696 | struct mfc6_cache *c = kmem_cache_alloc(mrt_cachep, GFP_ATOMIC); | |
697 | if (c == NULL) | |
698 | return NULL; | |
699 | memset(c, 0, sizeof(*c)); | |
700 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
701 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
702 | return c; | |
703 | } | |
704 | ||
705 | /* | |
706 | * A cache entry has gone into a resolved state from queued | |
707 | */ | |
708 | ||
709 | static void ip6mr_cache_resolve(struct mfc6_cache *uc, struct mfc6_cache *c) | |
710 | { | |
711 | struct sk_buff *skb; | |
712 | ||
713 | /* | |
714 | * Play the pending entries through our router | |
715 | */ | |
716 | ||
717 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
718 | if (ipv6_hdr(skb)->version == 0) { | |
719 | int err; | |
720 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
721 | ||
722 | if (ip6mr_fill_mroute(skb, c, NLMSG_DATA(nlh)) > 0) { | |
549e028d | 723 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
724 | } else { |
725 | nlh->nlmsg_type = NLMSG_ERROR; | |
726 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
727 | skb_trim(skb, nlh->nlmsg_len); | |
728 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
729 | } | |
730 | err = rtnl_unicast(skb, &init_net, NETLINK_CB(skb).pid); | |
731 | } else | |
732 | ip6_mr_forward(skb, c); | |
733 | } | |
734 | } | |
735 | ||
736 | /* | |
737 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
738 | * expects the following bizarre scheme. | |
739 | * | |
740 | * Called under mrt_lock. | |
741 | */ | |
742 | ||
6ac7eb08 | 743 | static int ip6mr_cache_report(struct sk_buff *pkt, mifi_t mifi, int assert) |
7bc570c8 YH |
744 | { |
745 | struct sk_buff *skb; | |
746 | struct mrt6msg *msg; | |
747 | int ret; | |
748 | ||
14fb64e1 YH |
749 | #ifdef CONFIG_IPV6_PIMSM_V2 |
750 | if (assert == MRT6MSG_WHOLEPKT) | |
751 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
752 | +sizeof(*msg)); | |
753 | else | |
754 | #endif | |
755 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
756 | |
757 | if (!skb) | |
758 | return -ENOBUFS; | |
759 | ||
760 | /* I suppose that internal messages | |
761 | * do not require checksums */ | |
762 | ||
763 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
764 | ||
14fb64e1 YH |
765 | #ifdef CONFIG_IPV6_PIMSM_V2 |
766 | if (assert == MRT6MSG_WHOLEPKT) { | |
767 | /* Ugly, but we have no choice with this interface. | |
768 | Duplicate old header, fix length etc. | |
769 | And all this only to mangle msg->im6_msgtype and | |
770 | to set msg->im6_mbz to "mbz" :-) | |
771 | */ | |
772 | skb_push(skb, -skb_network_offset(pkt)); | |
773 | ||
774 | skb_push(skb, sizeof(*msg)); | |
775 | skb_reset_transport_header(skb); | |
776 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
777 | msg->im6_mbz = 0; | |
778 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
779 | msg->im6_mif = reg_vif_num; | |
780 | msg->im6_pad = 0; | |
781 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
782 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
783 | ||
784 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
785 | } else | |
786 | #endif | |
787 | { | |
7bc570c8 YH |
788 | /* |
789 | * Copy the IP header | |
790 | */ | |
791 | ||
792 | skb_put(skb, sizeof(struct ipv6hdr)); | |
793 | skb_reset_network_header(skb); | |
794 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
795 | ||
796 | /* | |
797 | * Add our header | |
798 | */ | |
799 | skb_put(skb, sizeof(*msg)); | |
800 | skb_reset_transport_header(skb); | |
801 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
802 | ||
803 | msg->im6_mbz = 0; | |
804 | msg->im6_msgtype = assert; | |
6ac7eb08 | 805 | msg->im6_mif = mifi; |
7bc570c8 YH |
806 | msg->im6_pad = 0; |
807 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
808 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
809 | ||
810 | skb->dst = dst_clone(pkt->dst); | |
811 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
812 | ||
813 | skb_pull(skb, sizeof(struct ipv6hdr)); | |
14fb64e1 | 814 | } |
7bc570c8 YH |
815 | |
816 | if (mroute6_socket == NULL) { | |
817 | kfree_skb(skb); | |
818 | return -EINVAL; | |
819 | } | |
820 | ||
821 | /* | |
822 | * Deliver to user space multicast routing algorithms | |
823 | */ | |
824 | if ((ret = sock_queue_rcv_skb(mroute6_socket, skb)) < 0) { | |
825 | if (net_ratelimit()) | |
826 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
827 | kfree_skb(skb); | |
828 | } | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
833 | /* | |
834 | * Queue a packet for resolution. It gets locked cache entry! | |
835 | */ | |
836 | ||
837 | static int | |
6ac7eb08 | 838 | ip6mr_cache_unresolved(mifi_t mifi, struct sk_buff *skb) |
7bc570c8 YH |
839 | { |
840 | int err; | |
841 | struct mfc6_cache *c; | |
842 | ||
843 | spin_lock_bh(&mfc_unres_lock); | |
844 | for (c = mfc_unres_queue; c; c = c->next) { | |
845 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && | |
846 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) | |
847 | break; | |
848 | } | |
849 | ||
850 | if (c == NULL) { | |
851 | /* | |
852 | * Create a new entry if allowable | |
853 | */ | |
854 | ||
855 | if (atomic_read(&cache_resolve_queue_len) >= 10 || | |
856 | (c = ip6mr_cache_alloc_unres()) == NULL) { | |
857 | spin_unlock_bh(&mfc_unres_lock); | |
858 | ||
859 | kfree_skb(skb); | |
860 | return -ENOBUFS; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Fill in the new cache entry | |
865 | */ | |
866 | c->mf6c_parent = -1; | |
867 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
868 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
869 | ||
870 | /* | |
871 | * Reflect first query at pim6sd | |
872 | */ | |
6ac7eb08 | 873 | if ((err = ip6mr_cache_report(skb, mifi, MRT6MSG_NOCACHE)) < 0) { |
7bc570c8 YH |
874 | /* If the report failed throw the cache entry |
875 | out - Brad Parker | |
876 | */ | |
877 | spin_unlock_bh(&mfc_unres_lock); | |
878 | ||
879 | kmem_cache_free(mrt_cachep, c); | |
880 | kfree_skb(skb); | |
881 | return err; | |
882 | } | |
883 | ||
884 | atomic_inc(&cache_resolve_queue_len); | |
885 | c->next = mfc_unres_queue; | |
886 | mfc_unres_queue = c; | |
887 | ||
888 | ipmr_do_expire_process(1); | |
889 | } | |
890 | ||
891 | /* | |
892 | * See if we can append the packet | |
893 | */ | |
894 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
895 | kfree_skb(skb); | |
896 | err = -ENOBUFS; | |
897 | } else { | |
898 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
899 | err = 0; | |
900 | } | |
901 | ||
902 | spin_unlock_bh(&mfc_unres_lock); | |
903 | return err; | |
904 | } | |
905 | ||
906 | /* | |
907 | * MFC6 cache manipulation by user space | |
908 | */ | |
909 | ||
910 | static int ip6mr_mfc_delete(struct mf6cctl *mfc) | |
911 | { | |
912 | int line; | |
913 | struct mfc6_cache *c, **cp; | |
914 | ||
915 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
916 | ||
917 | for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) { | |
918 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && | |
919 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
920 | write_lock_bh(&mrt_lock); | |
921 | *cp = c->next; | |
922 | write_unlock_bh(&mrt_lock); | |
923 | ||
924 | kmem_cache_free(mrt_cachep, c); | |
925 | return 0; | |
926 | } | |
927 | } | |
928 | return -ENOENT; | |
929 | } | |
930 | ||
931 | static int ip6mr_device_event(struct notifier_block *this, | |
932 | unsigned long event, void *ptr) | |
933 | { | |
934 | struct net_device *dev = ptr; | |
935 | struct mif_device *v; | |
936 | int ct; | |
937 | ||
721499e8 | 938 | if (!net_eq(dev_net(dev), &init_net)) |
7bc570c8 YH |
939 | return NOTIFY_DONE; |
940 | ||
941 | if (event != NETDEV_UNREGISTER) | |
942 | return NOTIFY_DONE; | |
943 | ||
944 | v = &vif6_table[0]; | |
945 | for (ct = 0; ct < maxvif; ct++, v++) { | |
946 | if (v->dev == dev) | |
947 | mif6_delete(ct); | |
948 | } | |
949 | return NOTIFY_DONE; | |
950 | } | |
951 | ||
952 | static struct notifier_block ip6_mr_notifier = { | |
953 | .notifier_call = ip6mr_device_event | |
954 | }; | |
955 | ||
956 | /* | |
957 | * Setup for IP multicast routing | |
958 | */ | |
959 | ||
623d1a1a | 960 | int __init ip6_mr_init(void) |
7bc570c8 | 961 | { |
623d1a1a WC |
962 | int err; |
963 | ||
7bc570c8 YH |
964 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
965 | sizeof(struct mfc6_cache), | |
966 | 0, SLAB_HWCACHE_ALIGN, | |
967 | NULL); | |
968 | if (!mrt_cachep) | |
623d1a1a | 969 | return -ENOMEM; |
7bc570c8 YH |
970 | |
971 | setup_timer(&ipmr_expire_timer, ipmr_expire_process, 0); | |
623d1a1a WC |
972 | err = register_netdevice_notifier(&ip6_mr_notifier); |
973 | if (err) | |
974 | goto reg_notif_fail; | |
975 | #ifdef CONFIG_PROC_FS | |
976 | err = -ENOMEM; | |
977 | if (!proc_net_fops_create(&init_net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
978 | goto proc_vif_fail; | |
979 | if (!proc_net_fops_create(&init_net, "ip6_mr_cache", | |
980 | 0, &ip6mr_mfc_fops)) | |
981 | goto proc_cache_fail; | |
982 | #endif | |
983 | return 0; | |
7bc570c8 | 984 | #ifdef CONFIG_PROC_FS |
623d1a1a WC |
985 | proc_cache_fail: |
986 | proc_net_remove(&init_net, "ip6_mr_vif"); | |
87b30a65 BT |
987 | proc_vif_fail: |
988 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
7bc570c8 | 989 | #endif |
87b30a65 BT |
990 | reg_notif_fail: |
991 | del_timer(&ipmr_expire_timer); | |
992 | kmem_cache_destroy(mrt_cachep); | |
623d1a1a | 993 | return err; |
7bc570c8 YH |
994 | } |
995 | ||
623d1a1a WC |
996 | void ip6_mr_cleanup(void) |
997 | { | |
998 | #ifdef CONFIG_PROC_FS | |
999 | proc_net_remove(&init_net, "ip6_mr_cache"); | |
1000 | proc_net_remove(&init_net, "ip6_mr_vif"); | |
1001 | #endif | |
1002 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1003 | del_timer(&ipmr_expire_timer); | |
1004 | kmem_cache_destroy(mrt_cachep); | |
1005 | } | |
7bc570c8 YH |
1006 | |
1007 | static int ip6mr_mfc_add(struct mf6cctl *mfc, int mrtsock) | |
1008 | { | |
1009 | int line; | |
1010 | struct mfc6_cache *uc, *c, **cp; | |
6ac7eb08 | 1011 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1012 | int i; |
1013 | ||
6ac7eb08 RR |
1014 | memset(ttls, 255, MAXMIFS); |
1015 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1016 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1017 | ttls[i] = 1; | |
1018 | ||
1019 | } | |
1020 | ||
1021 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1022 | ||
1023 | for (cp = &mfc6_cache_array[line]; (c = *cp) != NULL; cp = &c->next) { | |
1024 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && | |
1025 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) | |
1026 | break; | |
1027 | } | |
1028 | ||
1029 | if (c != NULL) { | |
1030 | write_lock_bh(&mrt_lock); | |
1031 | c->mf6c_parent = mfc->mf6cc_parent; | |
1032 | ip6mr_update_thresholds(c, ttls); | |
1033 | if (!mrtsock) | |
1034 | c->mfc_flags |= MFC_STATIC; | |
1035 | write_unlock_bh(&mrt_lock); | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1040 | return -EINVAL; | |
1041 | ||
1042 | c = ip6mr_cache_alloc(); | |
1043 | if (c == NULL) | |
1044 | return -ENOMEM; | |
1045 | ||
1046 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1047 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1048 | c->mf6c_parent = mfc->mf6cc_parent; | |
1049 | ip6mr_update_thresholds(c, ttls); | |
1050 | if (!mrtsock) | |
1051 | c->mfc_flags |= MFC_STATIC; | |
1052 | ||
1053 | write_lock_bh(&mrt_lock); | |
1054 | c->next = mfc6_cache_array[line]; | |
1055 | mfc6_cache_array[line] = c; | |
1056 | write_unlock_bh(&mrt_lock); | |
1057 | ||
1058 | /* | |
1059 | * Check to see if we resolved a queued list. If so we | |
1060 | * need to send on the frames and tidy up. | |
1061 | */ | |
1062 | spin_lock_bh(&mfc_unres_lock); | |
1063 | for (cp = &mfc_unres_queue; (uc = *cp) != NULL; | |
1064 | cp = &uc->next) { | |
1065 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && | |
1066 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { | |
1067 | *cp = uc->next; | |
1068 | if (atomic_dec_and_test(&cache_resolve_queue_len)) | |
1069 | del_timer(&ipmr_expire_timer); | |
1070 | break; | |
1071 | } | |
1072 | } | |
1073 | spin_unlock_bh(&mfc_unres_lock); | |
1074 | ||
1075 | if (uc) { | |
1076 | ip6mr_cache_resolve(uc, c); | |
1077 | kmem_cache_free(mrt_cachep, uc); | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Close the multicast socket, and clear the vif tables etc | |
1084 | */ | |
1085 | ||
1086 | static void mroute_clean_tables(struct sock *sk) | |
1087 | { | |
1088 | int i; | |
1089 | ||
1090 | /* | |
1091 | * Shut down all active vif entries | |
1092 | */ | |
1093 | for (i = 0; i < maxvif; i++) { | |
1094 | if (!(vif6_table[i].flags & VIFF_STATIC)) | |
1095 | mif6_delete(i); | |
1096 | } | |
1097 | ||
1098 | /* | |
1099 | * Wipe the cache | |
1100 | */ | |
1101 | for (i = 0; i < ARRAY_SIZE(mfc6_cache_array); i++) { | |
1102 | struct mfc6_cache *c, **cp; | |
1103 | ||
1104 | cp = &mfc6_cache_array[i]; | |
1105 | while ((c = *cp) != NULL) { | |
1106 | if (c->mfc_flags & MFC_STATIC) { | |
1107 | cp = &c->next; | |
1108 | continue; | |
1109 | } | |
1110 | write_lock_bh(&mrt_lock); | |
1111 | *cp = c->next; | |
1112 | write_unlock_bh(&mrt_lock); | |
1113 | ||
1114 | kmem_cache_free(mrt_cachep, c); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | if (atomic_read(&cache_resolve_queue_len) != 0) { | |
1119 | struct mfc6_cache *c; | |
1120 | ||
1121 | spin_lock_bh(&mfc_unres_lock); | |
1122 | while (mfc_unres_queue != NULL) { | |
1123 | c = mfc_unres_queue; | |
1124 | mfc_unres_queue = c->next; | |
1125 | spin_unlock_bh(&mfc_unres_lock); | |
1126 | ||
1127 | ip6mr_destroy_unres(c); | |
1128 | ||
1129 | spin_lock_bh(&mfc_unres_lock); | |
1130 | } | |
1131 | spin_unlock_bh(&mfc_unres_lock); | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | static int ip6mr_sk_init(struct sock *sk) | |
1136 | { | |
1137 | int err = 0; | |
1138 | ||
1139 | rtnl_lock(); | |
1140 | write_lock_bh(&mrt_lock); | |
1141 | if (likely(mroute6_socket == NULL)) | |
1142 | mroute6_socket = sk; | |
1143 | else | |
1144 | err = -EADDRINUSE; | |
1145 | write_unlock_bh(&mrt_lock); | |
1146 | ||
1147 | rtnl_unlock(); | |
1148 | ||
1149 | return err; | |
1150 | } | |
1151 | ||
1152 | int ip6mr_sk_done(struct sock *sk) | |
1153 | { | |
1154 | int err = 0; | |
1155 | ||
1156 | rtnl_lock(); | |
1157 | if (sk == mroute6_socket) { | |
1158 | write_lock_bh(&mrt_lock); | |
1159 | mroute6_socket = NULL; | |
1160 | write_unlock_bh(&mrt_lock); | |
1161 | ||
1162 | mroute_clean_tables(sk); | |
1163 | } else | |
1164 | err = -EACCES; | |
1165 | rtnl_unlock(); | |
1166 | ||
1167 | return err; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * Socket options and virtual interface manipulation. The whole | |
1172 | * virtual interface system is a complete heap, but unfortunately | |
1173 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1174 | * MOSPF/PIM router set up we can clean this up. | |
1175 | */ | |
1176 | ||
1177 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int optlen) | |
1178 | { | |
1179 | int ret; | |
1180 | struct mif6ctl vif; | |
1181 | struct mf6cctl mfc; | |
1182 | mifi_t mifi; | |
1183 | ||
1184 | if (optname != MRT6_INIT) { | |
1185 | if (sk != mroute6_socket && !capable(CAP_NET_ADMIN)) | |
1186 | return -EACCES; | |
1187 | } | |
1188 | ||
1189 | switch (optname) { | |
1190 | case MRT6_INIT: | |
1191 | if (sk->sk_type != SOCK_RAW || | |
1192 | inet_sk(sk)->num != IPPROTO_ICMPV6) | |
1193 | return -EOPNOTSUPP; | |
1194 | if (optlen < sizeof(int)) | |
1195 | return -EINVAL; | |
1196 | ||
1197 | return ip6mr_sk_init(sk); | |
1198 | ||
1199 | case MRT6_DONE: | |
1200 | return ip6mr_sk_done(sk); | |
1201 | ||
1202 | case MRT6_ADD_MIF: | |
1203 | if (optlen < sizeof(vif)) | |
1204 | return -EINVAL; | |
1205 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1206 | return -EFAULT; | |
6ac7eb08 | 1207 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1208 | return -ENFILE; |
1209 | rtnl_lock(); | |
1210 | ret = mif6_add(&vif, sk == mroute6_socket); | |
1211 | rtnl_unlock(); | |
1212 | return ret; | |
1213 | ||
1214 | case MRT6_DEL_MIF: | |
1215 | if (optlen < sizeof(mifi_t)) | |
1216 | return -EINVAL; | |
1217 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1218 | return -EFAULT; | |
1219 | rtnl_lock(); | |
1220 | ret = mif6_delete(mifi); | |
1221 | rtnl_unlock(); | |
1222 | return ret; | |
1223 | ||
1224 | /* | |
1225 | * Manipulate the forwarding caches. These live | |
1226 | * in a sort of kernel/user symbiosis. | |
1227 | */ | |
1228 | case MRT6_ADD_MFC: | |
1229 | case MRT6_DEL_MFC: | |
1230 | if (optlen < sizeof(mfc)) | |
1231 | return -EINVAL; | |
1232 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1233 | return -EFAULT; | |
1234 | rtnl_lock(); | |
1235 | if (optname == MRT6_DEL_MFC) | |
1236 | ret = ip6mr_mfc_delete(&mfc); | |
1237 | else | |
1238 | ret = ip6mr_mfc_add(&mfc, sk == mroute6_socket); | |
1239 | rtnl_unlock(); | |
1240 | return ret; | |
1241 | ||
14fb64e1 YH |
1242 | /* |
1243 | * Control PIM assert (to activate pim will activate assert) | |
1244 | */ | |
1245 | case MRT6_ASSERT: | |
1246 | { | |
1247 | int v; | |
1248 | if (get_user(v, (int __user *)optval)) | |
1249 | return -EFAULT; | |
1250 | mroute_do_assert = !!v; | |
1251 | return 0; | |
1252 | } | |
1253 | ||
1254 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1255 | case MRT6_PIM: | |
1256 | { | |
a9f83bf3 | 1257 | int v; |
14fb64e1 YH |
1258 | if (get_user(v, (int __user *)optval)) |
1259 | return -EFAULT; | |
1260 | v = !!v; | |
1261 | rtnl_lock(); | |
1262 | ret = 0; | |
1263 | if (v != mroute_do_pim) { | |
1264 | mroute_do_pim = v; | |
1265 | mroute_do_assert = v; | |
1266 | if (mroute_do_pim) | |
1267 | ret = inet6_add_protocol(&pim6_protocol, | |
1268 | IPPROTO_PIM); | |
1269 | else | |
1270 | ret = inet6_del_protocol(&pim6_protocol, | |
1271 | IPPROTO_PIM); | |
1272 | if (ret < 0) | |
1273 | ret = -EAGAIN; | |
1274 | } | |
1275 | rtnl_unlock(); | |
1276 | return ret; | |
1277 | } | |
1278 | ||
1279 | #endif | |
7bc570c8 | 1280 | /* |
7d120c55 | 1281 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1282 | * set. |
1283 | */ | |
1284 | default: | |
1285 | return -ENOPROTOOPT; | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * Getsock opt support for the multicast routing system. | |
1291 | */ | |
1292 | ||
1293 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1294 | int __user *optlen) | |
1295 | { | |
1296 | int olr; | |
1297 | int val; | |
1298 | ||
1299 | switch (optname) { | |
1300 | case MRT6_VERSION: | |
1301 | val = 0x0305; | |
1302 | break; | |
14fb64e1 YH |
1303 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1304 | case MRT6_PIM: | |
1305 | val = mroute_do_pim; | |
1306 | break; | |
1307 | #endif | |
1308 | case MRT6_ASSERT: | |
1309 | val = mroute_do_assert; | |
1310 | break; | |
7bc570c8 YH |
1311 | default: |
1312 | return -ENOPROTOOPT; | |
1313 | } | |
1314 | ||
1315 | if (get_user(olr, optlen)) | |
1316 | return -EFAULT; | |
1317 | ||
1318 | olr = min_t(int, olr, sizeof(int)); | |
1319 | if (olr < 0) | |
1320 | return -EINVAL; | |
1321 | ||
1322 | if (put_user(olr, optlen)) | |
1323 | return -EFAULT; | |
1324 | if (copy_to_user(optval, &val, olr)) | |
1325 | return -EFAULT; | |
1326 | return 0; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * The IP multicast ioctl support routines. | |
1331 | */ | |
1332 | ||
1333 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1334 | { | |
1335 | struct sioc_sg_req6 sr; | |
1336 | struct sioc_mif_req6 vr; | |
1337 | struct mif_device *vif; | |
1338 | struct mfc6_cache *c; | |
1339 | ||
1340 | switch (cmd) { | |
1341 | case SIOCGETMIFCNT_IN6: | |
1342 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1343 | return -EFAULT; | |
1344 | if (vr.mifi >= maxvif) | |
1345 | return -EINVAL; | |
1346 | read_lock(&mrt_lock); | |
1347 | vif = &vif6_table[vr.mifi]; | |
1348 | if (MIF_EXISTS(vr.mifi)) { | |
1349 | vr.icount = vif->pkt_in; | |
1350 | vr.ocount = vif->pkt_out; | |
1351 | vr.ibytes = vif->bytes_in; | |
1352 | vr.obytes = vif->bytes_out; | |
1353 | read_unlock(&mrt_lock); | |
1354 | ||
1355 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1356 | return -EFAULT; | |
1357 | return 0; | |
1358 | } | |
1359 | read_unlock(&mrt_lock); | |
1360 | return -EADDRNOTAVAIL; | |
1361 | case SIOCGETSGCNT_IN6: | |
1362 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1363 | return -EFAULT; | |
1364 | ||
1365 | read_lock(&mrt_lock); | |
1366 | c = ip6mr_cache_find(&sr.src.sin6_addr, &sr.grp.sin6_addr); | |
1367 | if (c) { | |
1368 | sr.pktcnt = c->mfc_un.res.pkt; | |
1369 | sr.bytecnt = c->mfc_un.res.bytes; | |
1370 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1371 | read_unlock(&mrt_lock); | |
1372 | ||
1373 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1374 | return -EFAULT; | |
1375 | return 0; | |
1376 | } | |
1377 | read_unlock(&mrt_lock); | |
1378 | return -EADDRNOTAVAIL; | |
1379 | default: | |
1380 | return -ENOIOCTLCMD; | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | ||
1385 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1386 | { | |
483a47d2 DL |
1387 | IP6_INC_STATS_BH(dev_net(skb->dst->dev), ip6_dst_idev(skb->dst), |
1388 | IPSTATS_MIB_OUTFORWDATAGRAMS); | |
7bc570c8 YH |
1389 | return dst_output(skb); |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | * Processing handlers for ip6mr_forward | |
1394 | */ | |
1395 | ||
1396 | static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
1397 | { | |
1398 | struct ipv6hdr *ipv6h; | |
1399 | struct mif_device *vif = &vif6_table[vifi]; | |
1400 | struct net_device *dev; | |
1401 | struct dst_entry *dst; | |
1402 | struct flowi fl; | |
1403 | ||
1404 | if (vif->dev == NULL) | |
1405 | goto out_free; | |
1406 | ||
14fb64e1 YH |
1407 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1408 | if (vif->flags & MIFF_REGISTER) { | |
1409 | vif->pkt_out++; | |
1410 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1411 | vif->dev->stats.tx_bytes += skb->len; |
1412 | vif->dev->stats.tx_packets++; | |
14fb64e1 YH |
1413 | ip6mr_cache_report(skb, vifi, MRT6MSG_WHOLEPKT); |
1414 | kfree_skb(skb); | |
1415 | return 0; | |
1416 | } | |
1417 | #endif | |
1418 | ||
7bc570c8 YH |
1419 | ipv6h = ipv6_hdr(skb); |
1420 | ||
1421 | fl = (struct flowi) { | |
1422 | .oif = vif->link, | |
1423 | .nl_u = { .ip6_u = | |
1424 | { .daddr = ipv6h->daddr, } | |
1425 | } | |
1426 | }; | |
1427 | ||
1428 | dst = ip6_route_output(&init_net, NULL, &fl); | |
1429 | if (!dst) | |
1430 | goto out_free; | |
1431 | ||
1432 | dst_release(skb->dst); | |
1433 | skb->dst = dst; | |
1434 | ||
1435 | /* | |
1436 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1437 | * not only before forwarding, but after forwarding on all output | |
1438 | * interfaces. It is clear, if mrouter runs a multicasting | |
1439 | * program, it should receive packets not depending to what interface | |
1440 | * program is joined. | |
1441 | * If we will not make it, the program will have to join on all | |
1442 | * interfaces. On the other hand, multihoming host (or router, but | |
1443 | * not mrouter) cannot join to more than one interface - it will | |
1444 | * result in receiving multiple packets. | |
1445 | */ | |
1446 | dev = vif->dev; | |
1447 | skb->dev = dev; | |
1448 | vif->pkt_out++; | |
1449 | vif->bytes_out += skb->len; | |
1450 | ||
1451 | /* We are about to write */ | |
1452 | /* XXX: extension headers? */ | |
1453 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1454 | goto out_free; | |
1455 | ||
1456 | ipv6h = ipv6_hdr(skb); | |
1457 | ipv6h->hop_limit--; | |
1458 | ||
1459 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1460 | ||
1461 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dev, | |
1462 | ip6mr_forward2_finish); | |
1463 | ||
1464 | out_free: | |
1465 | kfree_skb(skb); | |
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | static int ip6mr_find_vif(struct net_device *dev) | |
1470 | { | |
1471 | int ct; | |
1472 | for (ct = maxvif - 1; ct >= 0; ct--) { | |
1473 | if (vif6_table[ct].dev == dev) | |
1474 | break; | |
1475 | } | |
1476 | return ct; | |
1477 | } | |
1478 | ||
1479 | static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache) | |
1480 | { | |
1481 | int psend = -1; | |
1482 | int vif, ct; | |
1483 | ||
1484 | vif = cache->mf6c_parent; | |
1485 | cache->mfc_un.res.pkt++; | |
1486 | cache->mfc_un.res.bytes += skb->len; | |
1487 | ||
14fb64e1 YH |
1488 | /* |
1489 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1490 | */ | |
1491 | if (vif6_table[vif].dev != skb->dev) { | |
1492 | int true_vifi; | |
1493 | ||
1494 | cache->mfc_un.res.wrong_if++; | |
1495 | true_vifi = ip6mr_find_vif(skb->dev); | |
1496 | ||
1497 | if (true_vifi >= 0 && mroute_do_assert && | |
1498 | /* pimsm uses asserts, when switching from RPT to SPT, | |
1499 | so that we cannot check that packet arrived on an oif. | |
1500 | It is bad, but otherwise we would need to move pretty | |
1501 | large chunk of pimd to kernel. Ough... --ANK | |
1502 | */ | |
1503 | (mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) && | |
1504 | time_after(jiffies, | |
1505 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1506 | cache->mfc_un.res.last_assert = jiffies; | |
1507 | ip6mr_cache_report(skb, true_vifi, MRT6MSG_WRONGMIF); | |
1508 | } | |
1509 | goto dont_forward; | |
1510 | } | |
1511 | ||
7bc570c8 YH |
1512 | vif6_table[vif].pkt_in++; |
1513 | vif6_table[vif].bytes_in += skb->len; | |
1514 | ||
1515 | /* | |
1516 | * Forward the frame | |
1517 | */ | |
1518 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1519 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
1520 | if (psend != -1) { | |
1521 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1522 | if (skb2) | |
1523 | ip6mr_forward2(skb2, cache, psend); | |
1524 | } | |
1525 | psend = ct; | |
1526 | } | |
1527 | } | |
1528 | if (psend != -1) { | |
1529 | ip6mr_forward2(skb, cache, psend); | |
1530 | return 0; | |
1531 | } | |
1532 | ||
14fb64e1 | 1533 | dont_forward: |
7bc570c8 YH |
1534 | kfree_skb(skb); |
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | ||
1539 | /* | |
1540 | * Multicast packets for forwarding arrive here | |
1541 | */ | |
1542 | ||
1543 | int ip6_mr_input(struct sk_buff *skb) | |
1544 | { | |
1545 | struct mfc6_cache *cache; | |
1546 | ||
1547 | read_lock(&mrt_lock); | |
1548 | cache = ip6mr_cache_find(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); | |
1549 | ||
1550 | /* | |
1551 | * No usable cache entry | |
1552 | */ | |
1553 | if (cache == NULL) { | |
1554 | int vif; | |
1555 | ||
1556 | vif = ip6mr_find_vif(skb->dev); | |
1557 | if (vif >= 0) { | |
1558 | int err = ip6mr_cache_unresolved(vif, skb); | |
1559 | read_unlock(&mrt_lock); | |
1560 | ||
1561 | return err; | |
1562 | } | |
1563 | read_unlock(&mrt_lock); | |
1564 | kfree_skb(skb); | |
1565 | return -ENODEV; | |
1566 | } | |
1567 | ||
1568 | ip6_mr_forward(skb, cache); | |
1569 | ||
1570 | read_unlock(&mrt_lock); | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | ||
1576 | static int | |
1577 | ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm) | |
1578 | { | |
1579 | int ct; | |
1580 | struct rtnexthop *nhp; | |
1581 | struct net_device *dev = vif6_table[c->mf6c_parent].dev; | |
549e028d | 1582 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
1583 | struct rtattr *mp_head; |
1584 | ||
1585 | if (dev) | |
1586 | RTA_PUT(skb, RTA_IIF, 4, &dev->ifindex); | |
1587 | ||
1588 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
1589 | ||
1590 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
1591 | if (c->mfc_un.res.ttls[ct] < 255) { | |
1592 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) | |
1593 | goto rtattr_failure; | |
1594 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
1595 | nhp->rtnh_flags = 0; | |
1596 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
1597 | nhp->rtnh_ifindex = vif6_table[ct].dev->ifindex; | |
1598 | nhp->rtnh_len = sizeof(*nhp); | |
1599 | } | |
1600 | } | |
1601 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 1602 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
1603 | rtm->rtm_type = RTN_MULTICAST; |
1604 | return 1; | |
1605 | ||
1606 | rtattr_failure: | |
1607 | nlmsg_trim(skb, b); | |
1608 | return -EMSGSIZE; | |
1609 | } | |
1610 | ||
1611 | int ip6mr_get_route(struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1612 | { | |
1613 | int err; | |
1614 | struct mfc6_cache *cache; | |
1615 | struct rt6_info *rt = (struct rt6_info *)skb->dst; | |
1616 | ||
1617 | read_lock(&mrt_lock); | |
1618 | cache = ip6mr_cache_find(&rt->rt6i_src.addr, &rt->rt6i_dst.addr); | |
1619 | ||
1620 | if (!cache) { | |
1621 | struct sk_buff *skb2; | |
1622 | struct ipv6hdr *iph; | |
1623 | struct net_device *dev; | |
1624 | int vif; | |
1625 | ||
1626 | if (nowait) { | |
1627 | read_unlock(&mrt_lock); | |
1628 | return -EAGAIN; | |
1629 | } | |
1630 | ||
1631 | dev = skb->dev; | |
1632 | if (dev == NULL || (vif = ip6mr_find_vif(dev)) < 0) { | |
1633 | read_unlock(&mrt_lock); | |
1634 | return -ENODEV; | |
1635 | } | |
1636 | ||
1637 | /* really correct? */ | |
1638 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
1639 | if (!skb2) { | |
1640 | read_unlock(&mrt_lock); | |
1641 | return -ENOMEM; | |
1642 | } | |
1643 | ||
1644 | skb_reset_transport_header(skb2); | |
1645 | ||
1646 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
1647 | skb_reset_network_header(skb2); | |
1648 | ||
1649 | iph = ipv6_hdr(skb2); | |
1650 | iph->version = 0; | |
1651 | iph->priority = 0; | |
1652 | iph->flow_lbl[0] = 0; | |
1653 | iph->flow_lbl[1] = 0; | |
1654 | iph->flow_lbl[2] = 0; | |
1655 | iph->payload_len = 0; | |
1656 | iph->nexthdr = IPPROTO_NONE; | |
1657 | iph->hop_limit = 0; | |
1658 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
1659 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
1660 | ||
1661 | err = ip6mr_cache_unresolved(vif, skb2); | |
1662 | read_unlock(&mrt_lock); | |
1663 | ||
1664 | return err; | |
1665 | } | |
1666 | ||
1667 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1668 | cache->mfc_flags |= MFC_NOTIFY; | |
1669 | ||
1670 | err = ip6mr_fill_mroute(skb, cache, rtm); | |
1671 | read_unlock(&mrt_lock); | |
1672 | return err; | |
1673 | } | |
1674 |