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> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
7bc570c8 YH |
37 | #include <net/protocol.h> |
38 | #include <linux/skbuff.h> | |
39 | #include <net/sock.h> | |
7bc570c8 | 40 | #include <net/raw.h> |
7bc570c8 YH |
41 | #include <linux/notifier.h> |
42 | #include <linux/if_arp.h> | |
7bc570c8 YH |
43 | #include <net/checksum.h> |
44 | #include <net/netlink.h> | |
d1db275d | 45 | #include <net/fib_rules.h> |
7bc570c8 YH |
46 | |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <linux/mroute6.h> | |
14fb64e1 | 50 | #include <linux/pim.h> |
7bc570c8 YH |
51 | #include <net/addrconf.h> |
52 | #include <linux/netfilter_ipv6.h> | |
5d6e430d | 53 | #include <net/ip6_checksum.h> |
7bc570c8 | 54 | |
6bd52143 | 55 | struct mr6_table { |
d1db275d | 56 | struct list_head list; |
6bd52143 PM |
57 | #ifdef CONFIG_NET_NS |
58 | struct net *net; | |
59 | #endif | |
d1db275d | 60 | u32 id; |
6bd52143 PM |
61 | struct sock *mroute6_sk; |
62 | struct timer_list ipmr_expire_timer; | |
63 | struct list_head mfc6_unres_queue; | |
64 | struct list_head mfc6_cache_array[MFC6_LINES]; | |
65 | struct mif_device vif6_table[MAXMIFS]; | |
66 | int maxvif; | |
67 | atomic_t cache_resolve_queue_len; | |
68 | int mroute_do_assert; | |
69 | int mroute_do_pim; | |
70 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
71 | int mroute_reg_vif_num; | |
72 | #endif | |
73 | }; | |
74 | ||
d1db275d PM |
75 | struct ip6mr_rule { |
76 | struct fib_rule common; | |
77 | }; | |
78 | ||
79 | struct ip6mr_result { | |
80 | struct mr6_table *mrt; | |
81 | }; | |
82 | ||
7bc570c8 YH |
83 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
84 | Note that the changes are semaphored via rtnl_lock. | |
85 | */ | |
86 | ||
87 | static DEFINE_RWLOCK(mrt_lock); | |
88 | ||
89 | /* | |
90 | * Multicast router control variables | |
91 | */ | |
92 | ||
6bd52143 | 93 | #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL) |
7bc570c8 | 94 | |
7bc570c8 YH |
95 | /* Special spinlock for queue of unresolved entries */ |
96 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
97 | ||
98 | /* We return to original Alan's scheme. Hash table of resolved | |
99 | entries is changed only in process context and protected | |
100 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
101 | with strong spinlock mfc_unres_lock. | |
102 | ||
103 | In this case data path is free of exclusive locks at all. | |
104 | */ | |
105 | ||
106 | static struct kmem_cache *mrt_cachep __read_mostly; | |
107 | ||
d1db275d PM |
108 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id); |
109 | static void ip6mr_free_table(struct mr6_table *mrt); | |
110 | ||
6bd52143 PM |
111 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
112 | struct sk_buff *skb, struct mfc6_cache *cache); | |
113 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, | |
8229efda | 114 | mifi_t mifi, int assert); |
5b285cac PM |
115 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
116 | struct mfc6_cache *c, struct rtmsg *rtm); | |
117 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, | |
118 | struct netlink_callback *cb); | |
6bd52143 | 119 | static void mroute_clean_tables(struct mr6_table *mrt); |
d1db275d PM |
120 | static void ipmr_expire_process(unsigned long arg); |
121 | ||
122 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
8ffb335e | 123 | #define ip6mr_for_each_table(mrt, net) \ |
d1db275d PM |
124 | list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list) |
125 | ||
126 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) | |
127 | { | |
128 | struct mr6_table *mrt; | |
129 | ||
130 | ip6mr_for_each_table(mrt, net) { | |
131 | if (mrt->id == id) | |
132 | return mrt; | |
133 | } | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | static int ip6mr_fib_lookup(struct net *net, struct flowi *flp, | |
138 | struct mr6_table **mrt) | |
139 | { | |
140 | struct ip6mr_result res; | |
141 | struct fib_lookup_arg arg = { .result = &res, }; | |
142 | int err; | |
143 | ||
144 | err = fib_rules_lookup(net->ipv6.mr6_rules_ops, flp, 0, &arg); | |
145 | if (err < 0) | |
146 | return err; | |
147 | *mrt = res.mrt; | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
152 | int flags, struct fib_lookup_arg *arg) | |
153 | { | |
154 | struct ip6mr_result *res = arg->result; | |
155 | struct mr6_table *mrt; | |
156 | ||
157 | switch (rule->action) { | |
158 | case FR_ACT_TO_TBL: | |
159 | break; | |
160 | case FR_ACT_UNREACHABLE: | |
161 | return -ENETUNREACH; | |
162 | case FR_ACT_PROHIBIT: | |
163 | return -EACCES; | |
164 | case FR_ACT_BLACKHOLE: | |
165 | default: | |
166 | return -EINVAL; | |
167 | } | |
168 | ||
169 | mrt = ip6mr_get_table(rule->fr_net, rule->table); | |
170 | if (mrt == NULL) | |
171 | return -EAGAIN; | |
172 | res->mrt = mrt; | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) | |
177 | { | |
178 | return 1; | |
179 | } | |
180 | ||
181 | static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = { | |
182 | FRA_GENERIC_POLICY, | |
183 | }; | |
184 | ||
185 | static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
186 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
187 | { | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
192 | struct nlattr **tb) | |
193 | { | |
194 | return 1; | |
195 | } | |
196 | ||
197 | static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
198 | struct fib_rule_hdr *frh) | |
199 | { | |
200 | frh->dst_len = 0; | |
201 | frh->src_len = 0; | |
202 | frh->tos = 0; | |
203 | return 0; | |
204 | } | |
205 | ||
206 | static const struct fib_rules_ops __net_initdata ip6mr_rules_ops_template = { | |
207 | .family = RTNL_FAMILY_IP6MR, | |
208 | .rule_size = sizeof(struct ip6mr_rule), | |
209 | .addr_size = sizeof(struct in6_addr), | |
210 | .action = ip6mr_rule_action, | |
211 | .match = ip6mr_rule_match, | |
212 | .configure = ip6mr_rule_configure, | |
213 | .compare = ip6mr_rule_compare, | |
214 | .default_pref = fib_default_rule_pref, | |
215 | .fill = ip6mr_rule_fill, | |
216 | .nlgroup = RTNLGRP_IPV6_RULE, | |
217 | .policy = ip6mr_rule_policy, | |
218 | .owner = THIS_MODULE, | |
219 | }; | |
220 | ||
221 | static int __net_init ip6mr_rules_init(struct net *net) | |
222 | { | |
223 | struct fib_rules_ops *ops; | |
224 | struct mr6_table *mrt; | |
225 | int err; | |
226 | ||
227 | ops = fib_rules_register(&ip6mr_rules_ops_template, net); | |
228 | if (IS_ERR(ops)) | |
229 | return PTR_ERR(ops); | |
230 | ||
231 | INIT_LIST_HEAD(&net->ipv6.mr6_tables); | |
232 | ||
233 | mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); | |
234 | if (mrt == NULL) { | |
235 | err = -ENOMEM; | |
236 | goto err1; | |
237 | } | |
238 | ||
239 | err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); | |
240 | if (err < 0) | |
241 | goto err2; | |
242 | ||
243 | net->ipv6.mr6_rules_ops = ops; | |
244 | return 0; | |
245 | ||
246 | err2: | |
247 | kfree(mrt); | |
248 | err1: | |
249 | fib_rules_unregister(ops); | |
250 | return err; | |
251 | } | |
252 | ||
253 | static void __net_exit ip6mr_rules_exit(struct net *net) | |
254 | { | |
255 | struct mr6_table *mrt, *next; | |
256 | ||
035320d5 ED |
257 | list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { |
258 | list_del(&mrt->list); | |
d1db275d | 259 | ip6mr_free_table(mrt); |
035320d5 | 260 | } |
d1db275d PM |
261 | fib_rules_unregister(net->ipv6.mr6_rules_ops); |
262 | } | |
263 | #else | |
264 | #define ip6mr_for_each_table(mrt, net) \ | |
265 | for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) | |
266 | ||
267 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) | |
268 | { | |
269 | return net->ipv6.mrt6; | |
270 | } | |
271 | ||
272 | static int ip6mr_fib_lookup(struct net *net, struct flowi *flp, | |
273 | struct mr6_table **mrt) | |
274 | { | |
275 | *mrt = net->ipv6.mrt6; | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int __net_init ip6mr_rules_init(struct net *net) | |
280 | { | |
281 | net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT); | |
282 | return net->ipv6.mrt6 ? 0 : -ENOMEM; | |
283 | } | |
284 | ||
285 | static void __net_exit ip6mr_rules_exit(struct net *net) | |
286 | { | |
287 | ip6mr_free_table(net->ipv6.mrt6); | |
288 | } | |
289 | #endif | |
290 | ||
291 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id) | |
292 | { | |
293 | struct mr6_table *mrt; | |
294 | unsigned int i; | |
295 | ||
296 | mrt = ip6mr_get_table(net, id); | |
297 | if (mrt != NULL) | |
298 | return mrt; | |
299 | ||
300 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
301 | if (mrt == NULL) | |
302 | return NULL; | |
303 | mrt->id = id; | |
304 | write_pnet(&mrt->net, net); | |
305 | ||
306 | /* Forwarding cache */ | |
307 | for (i = 0; i < MFC6_LINES; i++) | |
308 | INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]); | |
309 | ||
310 | INIT_LIST_HEAD(&mrt->mfc6_unres_queue); | |
311 | ||
312 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
313 | (unsigned long)mrt); | |
314 | ||
315 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
316 | mrt->mroute_reg_vif_num = -1; | |
317 | #endif | |
318 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
319 | list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); | |
320 | #endif | |
321 | return mrt; | |
322 | } | |
7bc570c8 | 323 | |
d1db275d PM |
324 | static void ip6mr_free_table(struct mr6_table *mrt) |
325 | { | |
326 | del_timer(&mrt->ipmr_expire_timer); | |
327 | mroute_clean_tables(mrt); | |
328 | kfree(mrt); | |
329 | } | |
7bc570c8 YH |
330 | |
331 | #ifdef CONFIG_PROC_FS | |
332 | ||
333 | struct ipmr_mfc_iter { | |
8b90fc7e | 334 | struct seq_net_private p; |
d1db275d | 335 | struct mr6_table *mrt; |
f30a7784 | 336 | struct list_head *cache; |
7bc570c8 YH |
337 | int ct; |
338 | }; | |
339 | ||
340 | ||
8b90fc7e BT |
341 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
342 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 | 343 | { |
d1db275d | 344 | struct mr6_table *mrt = it->mrt; |
7bc570c8 YH |
345 | struct mfc6_cache *mfc; |
346 | ||
7bc570c8 | 347 | read_lock(&mrt_lock); |
f30a7784 | 348 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) { |
6bd52143 | 349 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 | 350 | list_for_each_entry(mfc, it->cache, list) |
7bc570c8 YH |
351 | if (pos-- == 0) |
352 | return mfc; | |
f30a7784 | 353 | } |
7bc570c8 YH |
354 | read_unlock(&mrt_lock); |
355 | ||
7bc570c8 | 356 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 357 | it->cache = &mrt->mfc6_unres_queue; |
f30a7784 | 358 | list_for_each_entry(mfc, it->cache, list) |
c476efbc | 359 | if (pos-- == 0) |
7bc570c8 YH |
360 | return mfc; |
361 | spin_unlock_bh(&mfc_unres_lock); | |
362 | ||
363 | it->cache = NULL; | |
364 | return NULL; | |
365 | } | |
366 | ||
7bc570c8 YH |
367 | /* |
368 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
369 | */ | |
370 | ||
371 | struct ipmr_vif_iter { | |
8b90fc7e | 372 | struct seq_net_private p; |
d1db275d | 373 | struct mr6_table *mrt; |
7bc570c8 YH |
374 | int ct; |
375 | }; | |
376 | ||
8b90fc7e BT |
377 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
378 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
379 | loff_t pos) |
380 | { | |
d1db275d | 381 | struct mr6_table *mrt = iter->mrt; |
6bd52143 PM |
382 | |
383 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
384 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 YH |
385 | continue; |
386 | if (pos-- == 0) | |
6bd52143 | 387 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
388 | } |
389 | return NULL; | |
390 | } | |
391 | ||
392 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
393 | __acquires(mrt_lock) | |
394 | { | |
d1db275d | 395 | struct ipmr_vif_iter *iter = seq->private; |
8b90fc7e | 396 | struct net *net = seq_file_net(seq); |
d1db275d PM |
397 | struct mr6_table *mrt; |
398 | ||
399 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); | |
400 | if (mrt == NULL) | |
401 | return ERR_PTR(-ENOENT); | |
402 | ||
403 | iter->mrt = mrt; | |
8b90fc7e | 404 | |
7bc570c8 | 405 | read_lock(&mrt_lock); |
8b90fc7e BT |
406 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
407 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
408 | } |
409 | ||
410 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
411 | { | |
412 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 413 | struct net *net = seq_file_net(seq); |
d1db275d | 414 | struct mr6_table *mrt = iter->mrt; |
7bc570c8 YH |
415 | |
416 | ++*pos; | |
417 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 418 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 419 | |
6bd52143 PM |
420 | while (++iter->ct < mrt->maxvif) { |
421 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 | 422 | continue; |
6bd52143 | 423 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
424 | } |
425 | return NULL; | |
426 | } | |
427 | ||
428 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
429 | __releases(mrt_lock) | |
430 | { | |
431 | read_unlock(&mrt_lock); | |
432 | } | |
433 | ||
434 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
435 | { | |
d1db275d PM |
436 | struct ipmr_vif_iter *iter = seq->private; |
437 | struct mr6_table *mrt = iter->mrt; | |
8b90fc7e | 438 | |
7bc570c8 YH |
439 | if (v == SEQ_START_TOKEN) { |
440 | seq_puts(seq, | |
441 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
442 | } else { | |
443 | const struct mif_device *vif = v; | |
444 | const char *name = vif->dev ? vif->dev->name : "none"; | |
445 | ||
446 | seq_printf(seq, | |
d430a227 | 447 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
6bd52143 | 448 | vif - mrt->vif6_table, |
7bc570c8 YH |
449 | name, vif->bytes_in, vif->pkt_in, |
450 | vif->bytes_out, vif->pkt_out, | |
451 | vif->flags); | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
98147d52 | 456 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
457 | .start = ip6mr_vif_seq_start, |
458 | .next = ip6mr_vif_seq_next, | |
459 | .stop = ip6mr_vif_seq_stop, | |
460 | .show = ip6mr_vif_seq_show, | |
461 | }; | |
462 | ||
463 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
464 | { | |
8b90fc7e BT |
465 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
466 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
467 | } |
468 | ||
5ca1b998 | 469 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
470 | .owner = THIS_MODULE, |
471 | .open = ip6mr_vif_open, | |
472 | .read = seq_read, | |
473 | .llseek = seq_lseek, | |
8b90fc7e | 474 | .release = seq_release_net, |
7bc570c8 YH |
475 | }; |
476 | ||
477 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
478 | { | |
d1db275d | 479 | struct ipmr_mfc_iter *it = seq->private; |
8b90fc7e | 480 | struct net *net = seq_file_net(seq); |
d1db275d | 481 | struct mr6_table *mrt; |
8b90fc7e | 482 | |
d1db275d PM |
483 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
484 | if (mrt == NULL) | |
485 | return ERR_PTR(-ENOENT); | |
486 | ||
487 | it->mrt = mrt; | |
8b90fc7e BT |
488 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
489 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
490 | } |
491 | ||
492 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
493 | { | |
494 | struct mfc6_cache *mfc = v; | |
495 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 496 | struct net *net = seq_file_net(seq); |
d1db275d | 497 | struct mr6_table *mrt = it->mrt; |
7bc570c8 YH |
498 | |
499 | ++*pos; | |
500 | ||
501 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 502 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 | 503 | |
f30a7784 PM |
504 | if (mfc->list.next != it->cache) |
505 | return list_entry(mfc->list.next, struct mfc6_cache, list); | |
7bc570c8 | 506 | |
6bd52143 | 507 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 YH |
508 | goto end_of_list; |
509 | ||
6bd52143 | 510 | BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]); |
7bc570c8 | 511 | |
4a6258a0 | 512 | while (++it->ct < MFC6_LINES) { |
6bd52143 | 513 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 PM |
514 | if (list_empty(it->cache)) |
515 | continue; | |
516 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
517 | } |
518 | ||
519 | /* exhausted cache_array, show unresolved */ | |
520 | read_unlock(&mrt_lock); | |
6bd52143 | 521 | it->cache = &mrt->mfc6_unres_queue; |
7bc570c8 YH |
522 | it->ct = 0; |
523 | ||
524 | spin_lock_bh(&mfc_unres_lock); | |
f30a7784 PM |
525 | if (!list_empty(it->cache)) |
526 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
527 | |
528 | end_of_list: | |
529 | spin_unlock_bh(&mfc_unres_lock); | |
530 | it->cache = NULL; | |
531 | ||
532 | return NULL; | |
533 | } | |
534 | ||
535 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
536 | { | |
537 | struct ipmr_mfc_iter *it = seq->private; | |
d1db275d | 538 | struct mr6_table *mrt = it->mrt; |
7bc570c8 | 539 | |
6bd52143 | 540 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 | 541 | spin_unlock_bh(&mfc_unres_lock); |
6bd52143 | 542 | else if (it->cache == mrt->mfc6_cache_array) |
7bc570c8 YH |
543 | read_unlock(&mrt_lock); |
544 | } | |
545 | ||
546 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
547 | { | |
548 | int n; | |
549 | ||
550 | if (v == SEQ_START_TOKEN) { | |
551 | seq_puts(seq, | |
552 | "Group " | |
553 | "Origin " | |
554 | "Iif Pkts Bytes Wrong Oifs\n"); | |
555 | } else { | |
556 | const struct mfc6_cache *mfc = v; | |
557 | const struct ipmr_mfc_iter *it = seq->private; | |
d1db275d | 558 | struct mr6_table *mrt = it->mrt; |
7bc570c8 | 559 | |
999890b2 | 560 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 561 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 562 | mfc->mf6c_parent); |
7bc570c8 | 563 | |
6bd52143 | 564 | if (it->cache != &mrt->mfc6_unres_queue) { |
1ea472e2 BT |
565 | seq_printf(seq, " %8lu %8lu %8lu", |
566 | mfc->mfc_un.res.pkt, | |
567 | mfc->mfc_un.res.bytes, | |
568 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
569 | for (n = mfc->mfc_un.res.minvif; |
570 | n < mfc->mfc_un.res.maxvif; n++) { | |
6bd52143 | 571 | if (MIF_EXISTS(mrt, n) && |
7bc570c8 YH |
572 | mfc->mfc_un.res.ttls[n] < 255) |
573 | seq_printf(seq, | |
574 | " %2d:%-3d", | |
575 | n, mfc->mfc_un.res.ttls[n]); | |
576 | } | |
1ea472e2 BT |
577 | } else { |
578 | /* unresolved mfc_caches don't contain | |
579 | * pkt, bytes and wrong_if values | |
580 | */ | |
581 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
582 | } |
583 | seq_putc(seq, '\n'); | |
584 | } | |
585 | return 0; | |
586 | } | |
587 | ||
88e9d34c | 588 | static const struct seq_operations ipmr_mfc_seq_ops = { |
7bc570c8 YH |
589 | .start = ipmr_mfc_seq_start, |
590 | .next = ipmr_mfc_seq_next, | |
591 | .stop = ipmr_mfc_seq_stop, | |
592 | .show = ipmr_mfc_seq_show, | |
593 | }; | |
594 | ||
595 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
596 | { | |
8b90fc7e BT |
597 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
598 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
599 | } |
600 | ||
5ca1b998 | 601 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
602 | .owner = THIS_MODULE, |
603 | .open = ipmr_mfc_open, | |
604 | .read = seq_read, | |
605 | .llseek = seq_lseek, | |
8b90fc7e | 606 | .release = seq_release_net, |
7bc570c8 YH |
607 | }; |
608 | #endif | |
609 | ||
14fb64e1 | 610 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
611 | |
612 | static int pim6_rcv(struct sk_buff *skb) | |
613 | { | |
614 | struct pimreghdr *pim; | |
615 | struct ipv6hdr *encap; | |
616 | struct net_device *reg_dev = NULL; | |
8229efda | 617 | struct net *net = dev_net(skb->dev); |
d1db275d PM |
618 | struct mr6_table *mrt; |
619 | struct flowi fl = { | |
620 | .iif = skb->dev->ifindex, | |
621 | .mark = skb->mark, | |
622 | }; | |
623 | int reg_vif_num; | |
14fb64e1 YH |
624 | |
625 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
626 | goto drop; | |
627 | ||
628 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
629 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
630 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
631 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
632 | sizeof(*pim), IPPROTO_PIM, | |
633 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 634 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
635 | goto drop; |
636 | ||
637 | /* check if the inner packet is destined to mcast group */ | |
638 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
639 | sizeof(*pim)); | |
640 | ||
641 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
642 | encap->payload_len == 0 || | |
643 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
644 | goto drop; | |
645 | ||
d1db275d PM |
646 | if (ip6mr_fib_lookup(net, &fl, &mrt) < 0) |
647 | goto drop; | |
648 | reg_vif_num = mrt->mroute_reg_vif_num; | |
649 | ||
14fb64e1 YH |
650 | read_lock(&mrt_lock); |
651 | if (reg_vif_num >= 0) | |
6bd52143 | 652 | reg_dev = mrt->vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
653 | if (reg_dev) |
654 | dev_hold(reg_dev); | |
655 | read_unlock(&mrt_lock); | |
656 | ||
657 | if (reg_dev == NULL) | |
658 | goto drop; | |
659 | ||
660 | skb->mac_header = skb->network_header; | |
661 | skb_pull(skb, (u8 *)encap - skb->data); | |
662 | skb_reset_network_header(skb); | |
1d6e55f1 | 663 | skb->protocol = htons(ETH_P_IPV6); |
14fb64e1 YH |
664 | skb->ip_summed = 0; |
665 | skb->pkt_type = PACKET_HOST; | |
d19d56dd ED |
666 | |
667 | skb_tunnel_rx(skb, reg_dev); | |
668 | ||
caf586e5 | 669 | netif_rx(skb); |
8990f468 | 670 | |
14fb64e1 YH |
671 | dev_put(reg_dev); |
672 | return 0; | |
673 | drop: | |
674 | kfree_skb(skb); | |
675 | return 0; | |
676 | } | |
677 | ||
41135cc8 | 678 | static const struct inet6_protocol pim6_protocol = { |
14fb64e1 YH |
679 | .handler = pim6_rcv, |
680 | }; | |
681 | ||
682 | /* Service routines creating virtual interfaces: PIMREG */ | |
683 | ||
6fef4c0c SH |
684 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
685 | struct net_device *dev) | |
14fb64e1 | 686 | { |
8229efda | 687 | struct net *net = dev_net(dev); |
d1db275d PM |
688 | struct mr6_table *mrt; |
689 | struct flowi fl = { | |
690 | .oif = dev->ifindex, | |
691 | .iif = skb->skb_iif, | |
692 | .mark = skb->mark, | |
693 | }; | |
694 | int err; | |
695 | ||
696 | err = ip6mr_fib_lookup(net, &fl, &mrt); | |
697 | if (err < 0) | |
698 | return err; | |
8229efda | 699 | |
14fb64e1 | 700 | read_lock(&mrt_lock); |
dc58c78c PE |
701 | dev->stats.tx_bytes += skb->len; |
702 | dev->stats.tx_packets++; | |
6bd52143 | 703 | ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); |
14fb64e1 YH |
704 | read_unlock(&mrt_lock); |
705 | kfree_skb(skb); | |
6ed10654 | 706 | return NETDEV_TX_OK; |
14fb64e1 YH |
707 | } |
708 | ||
007c3838 SH |
709 | static const struct net_device_ops reg_vif_netdev_ops = { |
710 | .ndo_start_xmit = reg_vif_xmit, | |
711 | }; | |
712 | ||
14fb64e1 YH |
713 | static void reg_vif_setup(struct net_device *dev) |
714 | { | |
715 | dev->type = ARPHRD_PIMREG; | |
716 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
717 | dev->flags = IFF_NOARP; | |
007c3838 | 718 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 719 | dev->destructor = free_netdev; |
403dbb97 | 720 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
721 | } |
722 | ||
d1db275d | 723 | static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt) |
14fb64e1 YH |
724 | { |
725 | struct net_device *dev; | |
d1db275d PM |
726 | char name[IFNAMSIZ]; |
727 | ||
728 | if (mrt->id == RT6_TABLE_DFLT) | |
729 | sprintf(name, "pim6reg"); | |
730 | else | |
731 | sprintf(name, "pim6reg%u", mrt->id); | |
14fb64e1 | 732 | |
d1db275d | 733 | dev = alloc_netdev(0, name, reg_vif_setup); |
14fb64e1 YH |
734 | if (dev == NULL) |
735 | return NULL; | |
736 | ||
8229efda BT |
737 | dev_net_set(dev, net); |
738 | ||
14fb64e1 YH |
739 | if (register_netdevice(dev)) { |
740 | free_netdev(dev); | |
741 | return NULL; | |
742 | } | |
743 | dev->iflink = 0; | |
744 | ||
14fb64e1 YH |
745 | if (dev_open(dev)) |
746 | goto failure; | |
747 | ||
7af3db78 | 748 | dev_hold(dev); |
14fb64e1 YH |
749 | return dev; |
750 | ||
751 | failure: | |
752 | /* allow the register to be completed before unregistering. */ | |
753 | rtnl_unlock(); | |
754 | rtnl_lock(); | |
755 | ||
756 | unregister_netdevice(dev); | |
757 | return NULL; | |
758 | } | |
759 | #endif | |
760 | ||
7bc570c8 YH |
761 | /* |
762 | * Delete a VIF entry | |
763 | */ | |
764 | ||
6bd52143 | 765 | static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head) |
7bc570c8 YH |
766 | { |
767 | struct mif_device *v; | |
768 | struct net_device *dev; | |
1d6e55f1 | 769 | struct inet6_dev *in6_dev; |
6bd52143 PM |
770 | |
771 | if (vifi < 0 || vifi >= mrt->maxvif) | |
7bc570c8 YH |
772 | return -EADDRNOTAVAIL; |
773 | ||
6bd52143 | 774 | v = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
775 | |
776 | write_lock_bh(&mrt_lock); | |
777 | dev = v->dev; | |
778 | v->dev = NULL; | |
779 | ||
780 | if (!dev) { | |
781 | write_unlock_bh(&mrt_lock); | |
782 | return -EADDRNOTAVAIL; | |
783 | } | |
784 | ||
14fb64e1 | 785 | #ifdef CONFIG_IPV6_PIMSM_V2 |
6bd52143 PM |
786 | if (vifi == mrt->mroute_reg_vif_num) |
787 | mrt->mroute_reg_vif_num = -1; | |
14fb64e1 YH |
788 | #endif |
789 | ||
6bd52143 | 790 | if (vifi + 1 == mrt->maxvif) { |
7bc570c8 YH |
791 | int tmp; |
792 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
6bd52143 | 793 | if (MIF_EXISTS(mrt, tmp)) |
7bc570c8 YH |
794 | break; |
795 | } | |
6bd52143 | 796 | mrt->maxvif = tmp + 1; |
7bc570c8 YH |
797 | } |
798 | ||
799 | write_unlock_bh(&mrt_lock); | |
800 | ||
801 | dev_set_allmulti(dev, -1); | |
802 | ||
1d6e55f1 TG |
803 | in6_dev = __in6_dev_get(dev); |
804 | if (in6_dev) | |
805 | in6_dev->cnf.mc_forwarding--; | |
806 | ||
7bc570c8 | 807 | if (v->flags & MIFF_REGISTER) |
c871e664 | 808 | unregister_netdevice_queue(dev, head); |
7bc570c8 YH |
809 | |
810 | dev_put(dev); | |
811 | return 0; | |
812 | } | |
813 | ||
58701ad4 BT |
814 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
815 | { | |
58701ad4 BT |
816 | kmem_cache_free(mrt_cachep, c); |
817 | } | |
818 | ||
7bc570c8 YH |
819 | /* Destroy an unresolved cache entry, killing queued skbs |
820 | and reporting error to netlink readers. | |
821 | */ | |
822 | ||
6bd52143 | 823 | static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c) |
7bc570c8 | 824 | { |
6bd52143 | 825 | struct net *net = read_pnet(&mrt->net); |
7bc570c8 YH |
826 | struct sk_buff *skb; |
827 | ||
6bd52143 | 828 | atomic_dec(&mrt->cache_resolve_queue_len); |
7bc570c8 YH |
829 | |
830 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
831 | if (ipv6_hdr(skb)->version == 0) { | |
832 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
833 | nlh->nlmsg_type = NLMSG_ERROR; | |
834 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
835 | skb_trim(skb, nlh->nlmsg_len); | |
836 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
8229efda | 837 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 YH |
838 | } else |
839 | kfree_skb(skb); | |
840 | } | |
841 | ||
58701ad4 | 842 | ip6mr_cache_free(c); |
7bc570c8 YH |
843 | } |
844 | ||
845 | ||
c476efbc | 846 | /* Timer process for all the unresolved queue. */ |
7bc570c8 | 847 | |
6bd52143 | 848 | static void ipmr_do_expire_process(struct mr6_table *mrt) |
7bc570c8 YH |
849 | { |
850 | unsigned long now = jiffies; | |
851 | unsigned long expires = 10 * HZ; | |
f30a7784 | 852 | struct mfc6_cache *c, *next; |
7bc570c8 | 853 | |
6bd52143 | 854 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
7bc570c8 YH |
855 | if (time_after(c->mfc_un.unres.expires, now)) { |
856 | /* not yet... */ | |
857 | unsigned long interval = c->mfc_un.unres.expires - now; | |
858 | if (interval < expires) | |
859 | expires = interval; | |
7bc570c8 YH |
860 | continue; |
861 | } | |
862 | ||
f30a7784 | 863 | list_del(&c->list); |
6bd52143 | 864 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
865 | } |
866 | ||
6bd52143 PM |
867 | if (!list_empty(&mrt->mfc6_unres_queue)) |
868 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
7bc570c8 YH |
869 | } |
870 | ||
c476efbc | 871 | static void ipmr_expire_process(unsigned long arg) |
7bc570c8 | 872 | { |
6bd52143 | 873 | struct mr6_table *mrt = (struct mr6_table *)arg; |
c476efbc | 874 | |
7bc570c8 | 875 | if (!spin_trylock(&mfc_unres_lock)) { |
6bd52143 | 876 | mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); |
7bc570c8 YH |
877 | return; |
878 | } | |
879 | ||
6bd52143 PM |
880 | if (!list_empty(&mrt->mfc6_unres_queue)) |
881 | ipmr_do_expire_process(mrt); | |
7bc570c8 YH |
882 | |
883 | spin_unlock(&mfc_unres_lock); | |
884 | } | |
885 | ||
886 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
887 | ||
6bd52143 | 888 | static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache, |
b5aa30b1 | 889 | unsigned char *ttls) |
7bc570c8 YH |
890 | { |
891 | int vifi; | |
892 | ||
6ac7eb08 | 893 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 894 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 895 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 896 | |
6bd52143 PM |
897 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
898 | if (MIF_EXISTS(mrt, vifi) && | |
4e16880c | 899 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
900 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
901 | if (cache->mfc_un.res.minvif > vifi) | |
902 | cache->mfc_un.res.minvif = vifi; | |
903 | if (cache->mfc_un.res.maxvif <= vifi) | |
904 | cache->mfc_un.res.maxvif = vifi + 1; | |
905 | } | |
906 | } | |
907 | } | |
908 | ||
6bd52143 PM |
909 | static int mif6_add(struct net *net, struct mr6_table *mrt, |
910 | struct mif6ctl *vifc, int mrtsock) | |
7bc570c8 YH |
911 | { |
912 | int vifi = vifc->mif6c_mifi; | |
6bd52143 | 913 | struct mif_device *v = &mrt->vif6_table[vifi]; |
7bc570c8 | 914 | struct net_device *dev; |
1d6e55f1 | 915 | struct inet6_dev *in6_dev; |
5ae7b444 | 916 | int err; |
7bc570c8 YH |
917 | |
918 | /* Is vif busy ? */ | |
6bd52143 | 919 | if (MIF_EXISTS(mrt, vifi)) |
7bc570c8 YH |
920 | return -EADDRINUSE; |
921 | ||
922 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
923 | #ifdef CONFIG_IPV6_PIMSM_V2 |
924 | case MIFF_REGISTER: | |
925 | /* | |
926 | * Special Purpose VIF in PIM | |
927 | * All the packets will be sent to the daemon | |
928 | */ | |
6bd52143 | 929 | if (mrt->mroute_reg_vif_num >= 0) |
14fb64e1 | 930 | return -EADDRINUSE; |
d1db275d | 931 | dev = ip6mr_reg_vif(net, mrt); |
14fb64e1 YH |
932 | if (!dev) |
933 | return -ENOBUFS; | |
5ae7b444 WC |
934 | err = dev_set_allmulti(dev, 1); |
935 | if (err) { | |
936 | unregister_netdevice(dev); | |
7af3db78 | 937 | dev_put(dev); |
5ae7b444 WC |
938 | return err; |
939 | } | |
14fb64e1 YH |
940 | break; |
941 | #endif | |
7bc570c8 | 942 | case 0: |
8229efda | 943 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
944 | if (!dev) |
945 | return -EADDRNOTAVAIL; | |
5ae7b444 | 946 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
947 | if (err) { |
948 | dev_put(dev); | |
5ae7b444 | 949 | return err; |
7af3db78 | 950 | } |
7bc570c8 YH |
951 | break; |
952 | default: | |
953 | return -EINVAL; | |
954 | } | |
955 | ||
1d6e55f1 TG |
956 | in6_dev = __in6_dev_get(dev); |
957 | if (in6_dev) | |
958 | in6_dev->cnf.mc_forwarding++; | |
959 | ||
7bc570c8 YH |
960 | /* |
961 | * Fill in the VIF structures | |
962 | */ | |
963 | v->rate_limit = vifc->vifc_rate_limit; | |
964 | v->flags = vifc->mif6c_flags; | |
965 | if (!mrtsock) | |
966 | v->flags |= VIFF_STATIC; | |
967 | v->threshold = vifc->vifc_threshold; | |
968 | v->bytes_in = 0; | |
969 | v->bytes_out = 0; | |
970 | v->pkt_in = 0; | |
971 | v->pkt_out = 0; | |
972 | v->link = dev->ifindex; | |
973 | if (v->flags & MIFF_REGISTER) | |
974 | v->link = dev->iflink; | |
975 | ||
976 | /* And finish update writing critical data */ | |
977 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 978 | v->dev = dev; |
14fb64e1 YH |
979 | #ifdef CONFIG_IPV6_PIMSM_V2 |
980 | if (v->flags & MIFF_REGISTER) | |
6bd52143 | 981 | mrt->mroute_reg_vif_num = vifi; |
14fb64e1 | 982 | #endif |
6bd52143 PM |
983 | if (vifi + 1 > mrt->maxvif) |
984 | mrt->maxvif = vifi + 1; | |
7bc570c8 YH |
985 | write_unlock_bh(&mrt_lock); |
986 | return 0; | |
987 | } | |
988 | ||
6bd52143 | 989 | static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt, |
8229efda BT |
990 | struct in6_addr *origin, |
991 | struct in6_addr *mcastgrp) | |
7bc570c8 YH |
992 | { |
993 | int line = MFC6_HASH(mcastgrp, origin); | |
994 | struct mfc6_cache *c; | |
995 | ||
6bd52143 | 996 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
997 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
998 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
f30a7784 | 999 | return c; |
7bc570c8 | 1000 | } |
f30a7784 | 1001 | return NULL; |
7bc570c8 YH |
1002 | } |
1003 | ||
1004 | /* | |
1005 | * Allocate a multicast cache entry | |
1006 | */ | |
b5aa30b1 | 1007 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
7bc570c8 | 1008 | { |
36cbac59 | 1009 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
1010 | if (c == NULL) |
1011 | return NULL; | |
6ac7eb08 | 1012 | c->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 YH |
1013 | return c; |
1014 | } | |
1015 | ||
b5aa30b1 | 1016 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
7bc570c8 | 1017 | { |
36cbac59 | 1018 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
1019 | if (c == NULL) |
1020 | return NULL; | |
7bc570c8 YH |
1021 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
1022 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
1023 | return c; | |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * A cache entry has gone into a resolved state from queued | |
1028 | */ | |
1029 | ||
6bd52143 PM |
1030 | static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt, |
1031 | struct mfc6_cache *uc, struct mfc6_cache *c) | |
7bc570c8 YH |
1032 | { |
1033 | struct sk_buff *skb; | |
1034 | ||
1035 | /* | |
1036 | * Play the pending entries through our router | |
1037 | */ | |
1038 | ||
1039 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
1040 | if (ipv6_hdr(skb)->version == 0) { | |
1041 | int err; | |
1042 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
1043 | ||
5b285cac | 1044 | if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
549e028d | 1045 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
1046 | } else { |
1047 | nlh->nlmsg_type = NLMSG_ERROR; | |
1048 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
1049 | skb_trim(skb, nlh->nlmsg_len); | |
1050 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
1051 | } | |
b5aa30b1 | 1052 | err = rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 | 1053 | } else |
6bd52143 | 1054 | ip6_mr_forward(net, mrt, skb, c); |
7bc570c8 YH |
1055 | } |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
1060 | * expects the following bizarre scheme. | |
1061 | * | |
1062 | * Called under mrt_lock. | |
1063 | */ | |
1064 | ||
6bd52143 PM |
1065 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, |
1066 | mifi_t mifi, int assert) | |
7bc570c8 YH |
1067 | { |
1068 | struct sk_buff *skb; | |
1069 | struct mrt6msg *msg; | |
1070 | int ret; | |
1071 | ||
14fb64e1 YH |
1072 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1073 | if (assert == MRT6MSG_WHOLEPKT) | |
1074 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
1075 | +sizeof(*msg)); | |
1076 | else | |
1077 | #endif | |
1078 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
1079 | |
1080 | if (!skb) | |
1081 | return -ENOBUFS; | |
1082 | ||
1083 | /* I suppose that internal messages | |
1084 | * do not require checksums */ | |
1085 | ||
1086 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1087 | ||
14fb64e1 YH |
1088 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1089 | if (assert == MRT6MSG_WHOLEPKT) { | |
1090 | /* Ugly, but we have no choice with this interface. | |
1091 | Duplicate old header, fix length etc. | |
1092 | And all this only to mangle msg->im6_msgtype and | |
1093 | to set msg->im6_mbz to "mbz" :-) | |
1094 | */ | |
1095 | skb_push(skb, -skb_network_offset(pkt)); | |
1096 | ||
1097 | skb_push(skb, sizeof(*msg)); | |
1098 | skb_reset_transport_header(skb); | |
1099 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
1100 | msg->im6_mbz = 0; | |
1101 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
6bd52143 | 1102 | msg->im6_mif = mrt->mroute_reg_vif_num; |
14fb64e1 YH |
1103 | msg->im6_pad = 0; |
1104 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
1105 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
1106 | ||
1107 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1108 | } else | |
1109 | #endif | |
1110 | { | |
7bc570c8 YH |
1111 | /* |
1112 | * Copy the IP header | |
1113 | */ | |
1114 | ||
1115 | skb_put(skb, sizeof(struct ipv6hdr)); | |
1116 | skb_reset_network_header(skb); | |
1117 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
1118 | ||
1119 | /* | |
1120 | * Add our header | |
1121 | */ | |
1122 | skb_put(skb, sizeof(*msg)); | |
1123 | skb_reset_transport_header(skb); | |
1124 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
1125 | ||
1126 | msg->im6_mbz = 0; | |
1127 | msg->im6_msgtype = assert; | |
6ac7eb08 | 1128 | msg->im6_mif = mifi; |
7bc570c8 YH |
1129 | msg->im6_pad = 0; |
1130 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
1131 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
1132 | ||
adf30907 | 1133 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 1134 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 1135 | } |
7bc570c8 | 1136 | |
6bd52143 | 1137 | if (mrt->mroute6_sk == NULL) { |
7bc570c8 YH |
1138 | kfree_skb(skb); |
1139 | return -EINVAL; | |
1140 | } | |
1141 | ||
1142 | /* | |
1143 | * Deliver to user space multicast routing algorithms | |
1144 | */ | |
6bd52143 | 1145 | ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb); |
bd91b8bf | 1146 | if (ret < 0) { |
7bc570c8 YH |
1147 | if (net_ratelimit()) |
1148 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
1149 | kfree_skb(skb); | |
1150 | } | |
1151 | ||
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * Queue a packet for resolution. It gets locked cache entry! | |
1157 | */ | |
1158 | ||
1159 | static int | |
6bd52143 | 1160 | ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 | 1161 | { |
f30a7784 | 1162 | bool found = false; |
7bc570c8 YH |
1163 | int err; |
1164 | struct mfc6_cache *c; | |
1165 | ||
1166 | spin_lock_bh(&mfc_unres_lock); | |
6bd52143 | 1167 | list_for_each_entry(c, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1168 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
f30a7784 PM |
1169 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { |
1170 | found = true; | |
7bc570c8 | 1171 | break; |
f30a7784 | 1172 | } |
7bc570c8 YH |
1173 | } |
1174 | ||
f30a7784 | 1175 | if (!found) { |
7bc570c8 YH |
1176 | /* |
1177 | * Create a new entry if allowable | |
1178 | */ | |
1179 | ||
6bd52143 | 1180 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
b5aa30b1 | 1181 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
7bc570c8 YH |
1182 | spin_unlock_bh(&mfc_unres_lock); |
1183 | ||
1184 | kfree_skb(skb); | |
1185 | return -ENOBUFS; | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * Fill in the new cache entry | |
1190 | */ | |
1191 | c->mf6c_parent = -1; | |
1192 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
1193 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
1194 | ||
1195 | /* | |
1196 | * Reflect first query at pim6sd | |
1197 | */ | |
6bd52143 | 1198 | err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); |
8229efda | 1199 | if (err < 0) { |
7bc570c8 YH |
1200 | /* If the report failed throw the cache entry |
1201 | out - Brad Parker | |
1202 | */ | |
1203 | spin_unlock_bh(&mfc_unres_lock); | |
1204 | ||
58701ad4 | 1205 | ip6mr_cache_free(c); |
7bc570c8 YH |
1206 | kfree_skb(skb); |
1207 | return err; | |
1208 | } | |
1209 | ||
6bd52143 PM |
1210 | atomic_inc(&mrt->cache_resolve_queue_len); |
1211 | list_add(&c->list, &mrt->mfc6_unres_queue); | |
7bc570c8 | 1212 | |
6bd52143 | 1213 | ipmr_do_expire_process(mrt); |
7bc570c8 YH |
1214 | } |
1215 | ||
1216 | /* | |
1217 | * See if we can append the packet | |
1218 | */ | |
1219 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1220 | kfree_skb(skb); | |
1221 | err = -ENOBUFS; | |
1222 | } else { | |
1223 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
1224 | err = 0; | |
1225 | } | |
1226 | ||
1227 | spin_unlock_bh(&mfc_unres_lock); | |
1228 | return err; | |
1229 | } | |
1230 | ||
1231 | /* | |
1232 | * MFC6 cache manipulation by user space | |
1233 | */ | |
1234 | ||
6bd52143 | 1235 | static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc) |
7bc570c8 YH |
1236 | { |
1237 | int line; | |
f30a7784 | 1238 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1239 | |
1240 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1241 | ||
6bd52143 | 1242 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
1243 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
1244 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
1245 | write_lock_bh(&mrt_lock); | |
f30a7784 | 1246 | list_del(&c->list); |
7bc570c8 YH |
1247 | write_unlock_bh(&mrt_lock); |
1248 | ||
58701ad4 | 1249 | ip6mr_cache_free(c); |
7bc570c8 YH |
1250 | return 0; |
1251 | } | |
1252 | } | |
1253 | return -ENOENT; | |
1254 | } | |
1255 | ||
1256 | static int ip6mr_device_event(struct notifier_block *this, | |
1257 | unsigned long event, void *ptr) | |
1258 | { | |
1259 | struct net_device *dev = ptr; | |
8229efda | 1260 | struct net *net = dev_net(dev); |
d1db275d | 1261 | struct mr6_table *mrt; |
7bc570c8 YH |
1262 | struct mif_device *v; |
1263 | int ct; | |
c871e664 | 1264 | LIST_HEAD(list); |
7bc570c8 | 1265 | |
7bc570c8 YH |
1266 | if (event != NETDEV_UNREGISTER) |
1267 | return NOTIFY_DONE; | |
1268 | ||
d1db275d PM |
1269 | ip6mr_for_each_table(mrt, net) { |
1270 | v = &mrt->vif6_table[0]; | |
1271 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1272 | if (v->dev == dev) | |
1273 | mif6_delete(mrt, ct, &list); | |
1274 | } | |
7bc570c8 | 1275 | } |
c871e664 ED |
1276 | unregister_netdevice_many(&list); |
1277 | ||
7bc570c8 YH |
1278 | return NOTIFY_DONE; |
1279 | } | |
1280 | ||
1281 | static struct notifier_block ip6_mr_notifier = { | |
1282 | .notifier_call = ip6mr_device_event | |
1283 | }; | |
1284 | ||
1285 | /* | |
1286 | * Setup for IP multicast routing | |
1287 | */ | |
1288 | ||
4e16880c BT |
1289 | static int __net_init ip6mr_net_init(struct net *net) |
1290 | { | |
d1db275d | 1291 | int err; |
f30a7784 | 1292 | |
d1db275d PM |
1293 | err = ip6mr_rules_init(net); |
1294 | if (err < 0) | |
4e16880c | 1295 | goto fail; |
8b90fc7e BT |
1296 | |
1297 | #ifdef CONFIG_PROC_FS | |
1298 | err = -ENOMEM; | |
1299 | if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
1300 | goto proc_vif_fail; | |
1301 | if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) | |
1302 | goto proc_cache_fail; | |
1303 | #endif | |
6bd52143 | 1304 | |
4a6258a0 BT |
1305 | return 0; |
1306 | ||
8b90fc7e BT |
1307 | #ifdef CONFIG_PROC_FS |
1308 | proc_cache_fail: | |
1309 | proc_net_remove(net, "ip6_mr_vif"); | |
1310 | proc_vif_fail: | |
d1db275d | 1311 | ip6mr_rules_exit(net); |
8b90fc7e | 1312 | #endif |
4e16880c BT |
1313 | fail: |
1314 | return err; | |
1315 | } | |
1316 | ||
1317 | static void __net_exit ip6mr_net_exit(struct net *net) | |
1318 | { | |
8b90fc7e BT |
1319 | #ifdef CONFIG_PROC_FS |
1320 | proc_net_remove(net, "ip6_mr_cache"); | |
1321 | proc_net_remove(net, "ip6_mr_vif"); | |
1322 | #endif | |
d1db275d | 1323 | ip6mr_rules_exit(net); |
4e16880c BT |
1324 | } |
1325 | ||
1326 | static struct pernet_operations ip6mr_net_ops = { | |
1327 | .init = ip6mr_net_init, | |
1328 | .exit = ip6mr_net_exit, | |
1329 | }; | |
1330 | ||
623d1a1a | 1331 | int __init ip6_mr_init(void) |
7bc570c8 | 1332 | { |
623d1a1a WC |
1333 | int err; |
1334 | ||
7bc570c8 YH |
1335 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
1336 | sizeof(struct mfc6_cache), | |
1337 | 0, SLAB_HWCACHE_ALIGN, | |
1338 | NULL); | |
1339 | if (!mrt_cachep) | |
623d1a1a | 1340 | return -ENOMEM; |
7bc570c8 | 1341 | |
4e16880c BT |
1342 | err = register_pernet_subsys(&ip6mr_net_ops); |
1343 | if (err) | |
1344 | goto reg_pernet_fail; | |
1345 | ||
623d1a1a WC |
1346 | err = register_netdevice_notifier(&ip6_mr_notifier); |
1347 | if (err) | |
1348 | goto reg_notif_fail; | |
403dbb97 TG |
1349 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1350 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { | |
1351 | printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n"); | |
1352 | err = -EAGAIN; | |
1353 | goto add_proto_fail; | |
1354 | } | |
1355 | #endif | |
5b285cac | 1356 | rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL, ip6mr_rtm_dumproute); |
623d1a1a | 1357 | return 0; |
403dbb97 TG |
1358 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1359 | add_proto_fail: | |
1360 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1361 | #endif | |
87b30a65 | 1362 | reg_notif_fail: |
4e16880c BT |
1363 | unregister_pernet_subsys(&ip6mr_net_ops); |
1364 | reg_pernet_fail: | |
87b30a65 | 1365 | kmem_cache_destroy(mrt_cachep); |
623d1a1a | 1366 | return err; |
7bc570c8 YH |
1367 | } |
1368 | ||
623d1a1a WC |
1369 | void ip6_mr_cleanup(void) |
1370 | { | |
623d1a1a | 1371 | unregister_netdevice_notifier(&ip6_mr_notifier); |
4e16880c | 1372 | unregister_pernet_subsys(&ip6mr_net_ops); |
623d1a1a WC |
1373 | kmem_cache_destroy(mrt_cachep); |
1374 | } | |
7bc570c8 | 1375 | |
6bd52143 PM |
1376 | static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, |
1377 | struct mf6cctl *mfc, int mrtsock) | |
7bc570c8 | 1378 | { |
f30a7784 | 1379 | bool found = false; |
7bc570c8 | 1380 | int line; |
f30a7784 | 1381 | struct mfc6_cache *uc, *c; |
6ac7eb08 | 1382 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1383 | int i; |
1384 | ||
a50436f2 PM |
1385 | if (mfc->mf6cc_parent >= MAXMIFS) |
1386 | return -ENFILE; | |
1387 | ||
6ac7eb08 RR |
1388 | memset(ttls, 255, MAXMIFS); |
1389 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1390 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1391 | ttls[i] = 1; | |
1392 | ||
1393 | } | |
1394 | ||
1395 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1396 | ||
6bd52143 | 1397 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 | 1398 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
f30a7784 PM |
1399 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { |
1400 | found = true; | |
7bc570c8 | 1401 | break; |
f30a7784 | 1402 | } |
7bc570c8 YH |
1403 | } |
1404 | ||
f30a7784 | 1405 | if (found) { |
7bc570c8 YH |
1406 | write_lock_bh(&mrt_lock); |
1407 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1408 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1409 | if (!mrtsock) |
1410 | c->mfc_flags |= MFC_STATIC; | |
1411 | write_unlock_bh(&mrt_lock); | |
1412 | return 0; | |
1413 | } | |
1414 | ||
1415 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1416 | return -EINVAL; | |
1417 | ||
b5aa30b1 | 1418 | c = ip6mr_cache_alloc(); |
7bc570c8 YH |
1419 | if (c == NULL) |
1420 | return -ENOMEM; | |
1421 | ||
1422 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1423 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1424 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1425 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1426 | if (!mrtsock) |
1427 | c->mfc_flags |= MFC_STATIC; | |
1428 | ||
1429 | write_lock_bh(&mrt_lock); | |
6bd52143 | 1430 | list_add(&c->list, &mrt->mfc6_cache_array[line]); |
7bc570c8 YH |
1431 | write_unlock_bh(&mrt_lock); |
1432 | ||
1433 | /* | |
1434 | * Check to see if we resolved a queued list. If so we | |
1435 | * need to send on the frames and tidy up. | |
1436 | */ | |
f30a7784 | 1437 | found = false; |
7bc570c8 | 1438 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1439 | list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1440 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 | 1441 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
f30a7784 | 1442 | list_del(&uc->list); |
6bd52143 | 1443 | atomic_dec(&mrt->cache_resolve_queue_len); |
f30a7784 | 1444 | found = true; |
7bc570c8 YH |
1445 | break; |
1446 | } | |
1447 | } | |
6bd52143 PM |
1448 | if (list_empty(&mrt->mfc6_unres_queue)) |
1449 | del_timer(&mrt->ipmr_expire_timer); | |
7bc570c8 YH |
1450 | spin_unlock_bh(&mfc_unres_lock); |
1451 | ||
f30a7784 | 1452 | if (found) { |
6bd52143 | 1453 | ip6mr_cache_resolve(net, mrt, uc, c); |
58701ad4 | 1454 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1455 | } |
1456 | return 0; | |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * Close the multicast socket, and clear the vif tables etc | |
1461 | */ | |
1462 | ||
6bd52143 | 1463 | static void mroute_clean_tables(struct mr6_table *mrt) |
7bc570c8 YH |
1464 | { |
1465 | int i; | |
c871e664 | 1466 | LIST_HEAD(list); |
f30a7784 | 1467 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1468 | |
1469 | /* | |
1470 | * Shut down all active vif entries | |
1471 | */ | |
6bd52143 PM |
1472 | for (i = 0; i < mrt->maxvif; i++) { |
1473 | if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) | |
1474 | mif6_delete(mrt, i, &list); | |
7bc570c8 | 1475 | } |
c871e664 | 1476 | unregister_netdevice_many(&list); |
7bc570c8 YH |
1477 | |
1478 | /* | |
1479 | * Wipe the cache | |
1480 | */ | |
4a6258a0 | 1481 | for (i = 0; i < MFC6_LINES; i++) { |
6bd52143 | 1482 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { |
f30a7784 | 1483 | if (c->mfc_flags & MFC_STATIC) |
7bc570c8 | 1484 | continue; |
7bc570c8 | 1485 | write_lock_bh(&mrt_lock); |
f30a7784 | 1486 | list_del(&c->list); |
7bc570c8 YH |
1487 | write_unlock_bh(&mrt_lock); |
1488 | ||
58701ad4 | 1489 | ip6mr_cache_free(c); |
7bc570c8 YH |
1490 | } |
1491 | } | |
1492 | ||
6bd52143 | 1493 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
7bc570c8 | 1494 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1495 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
f30a7784 | 1496 | list_del(&c->list); |
6bd52143 | 1497 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
1498 | } |
1499 | spin_unlock_bh(&mfc_unres_lock); | |
1500 | } | |
1501 | } | |
1502 | ||
6bd52143 | 1503 | static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk) |
7bc570c8 YH |
1504 | { |
1505 | int err = 0; | |
8229efda | 1506 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1507 | |
1508 | rtnl_lock(); | |
1509 | write_lock_bh(&mrt_lock); | |
6bd52143 PM |
1510 | if (likely(mrt->mroute6_sk == NULL)) { |
1511 | mrt->mroute6_sk = sk; | |
1d6e55f1 TG |
1512 | net->ipv6.devconf_all->mc_forwarding++; |
1513 | } | |
7bc570c8 YH |
1514 | else |
1515 | err = -EADDRINUSE; | |
1516 | write_unlock_bh(&mrt_lock); | |
1517 | ||
1518 | rtnl_unlock(); | |
1519 | ||
1520 | return err; | |
1521 | } | |
1522 | ||
1523 | int ip6mr_sk_done(struct sock *sk) | |
1524 | { | |
d1db275d | 1525 | int err = -EACCES; |
8229efda | 1526 | struct net *net = sock_net(sk); |
d1db275d | 1527 | struct mr6_table *mrt; |
7bc570c8 YH |
1528 | |
1529 | rtnl_lock(); | |
d1db275d PM |
1530 | ip6mr_for_each_table(mrt, net) { |
1531 | if (sk == mrt->mroute6_sk) { | |
1532 | write_lock_bh(&mrt_lock); | |
1533 | mrt->mroute6_sk = NULL; | |
1534 | net->ipv6.devconf_all->mc_forwarding--; | |
1535 | write_unlock_bh(&mrt_lock); | |
7bc570c8 | 1536 | |
d1db275d PM |
1537 | mroute_clean_tables(mrt); |
1538 | err = 0; | |
1539 | break; | |
1540 | } | |
1541 | } | |
7bc570c8 YH |
1542 | rtnl_unlock(); |
1543 | ||
1544 | return err; | |
1545 | } | |
1546 | ||
d1db275d | 1547 | struct sock *mroute6_socket(struct net *net, struct sk_buff *skb) |
6bd52143 | 1548 | { |
d1db275d PM |
1549 | struct mr6_table *mrt; |
1550 | struct flowi fl = { | |
1551 | .iif = skb->skb_iif, | |
1552 | .oif = skb->dev->ifindex, | |
1553 | .mark = skb->mark, | |
1554 | }; | |
1555 | ||
1556 | if (ip6mr_fib_lookup(net, &fl, &mrt) < 0) | |
1557 | return NULL; | |
6bd52143 PM |
1558 | |
1559 | return mrt->mroute6_sk; | |
1560 | } | |
1561 | ||
7bc570c8 YH |
1562 | /* |
1563 | * Socket options and virtual interface manipulation. The whole | |
1564 | * virtual interface system is a complete heap, but unfortunately | |
1565 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1566 | * MOSPF/PIM router set up we can clean this up. | |
1567 | */ | |
1568 | ||
b7058842 | 1569 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
7bc570c8 YH |
1570 | { |
1571 | int ret; | |
1572 | struct mif6ctl vif; | |
1573 | struct mf6cctl mfc; | |
1574 | mifi_t mifi; | |
8229efda | 1575 | struct net *net = sock_net(sk); |
d1db275d PM |
1576 | struct mr6_table *mrt; |
1577 | ||
1578 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1579 | if (mrt == NULL) | |
1580 | return -ENOENT; | |
7bc570c8 YH |
1581 | |
1582 | if (optname != MRT6_INIT) { | |
6bd52143 | 1583 | if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN)) |
7bc570c8 YH |
1584 | return -EACCES; |
1585 | } | |
1586 | ||
1587 | switch (optname) { | |
1588 | case MRT6_INIT: | |
1589 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1590 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
7bc570c8 YH |
1591 | return -EOPNOTSUPP; |
1592 | if (optlen < sizeof(int)) | |
1593 | return -EINVAL; | |
1594 | ||
6bd52143 | 1595 | return ip6mr_sk_init(mrt, sk); |
7bc570c8 YH |
1596 | |
1597 | case MRT6_DONE: | |
1598 | return ip6mr_sk_done(sk); | |
1599 | ||
1600 | case MRT6_ADD_MIF: | |
1601 | if (optlen < sizeof(vif)) | |
1602 | return -EINVAL; | |
1603 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1604 | return -EFAULT; | |
6ac7eb08 | 1605 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1606 | return -ENFILE; |
1607 | rtnl_lock(); | |
6bd52143 | 1608 | ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1609 | rtnl_unlock(); |
1610 | return ret; | |
1611 | ||
1612 | case MRT6_DEL_MIF: | |
1613 | if (optlen < sizeof(mifi_t)) | |
1614 | return -EINVAL; | |
1615 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1616 | return -EFAULT; | |
1617 | rtnl_lock(); | |
6bd52143 | 1618 | ret = mif6_delete(mrt, mifi, NULL); |
7bc570c8 YH |
1619 | rtnl_unlock(); |
1620 | return ret; | |
1621 | ||
1622 | /* | |
1623 | * Manipulate the forwarding caches. These live | |
1624 | * in a sort of kernel/user symbiosis. | |
1625 | */ | |
1626 | case MRT6_ADD_MFC: | |
1627 | case MRT6_DEL_MFC: | |
1628 | if (optlen < sizeof(mfc)) | |
1629 | return -EINVAL; | |
1630 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1631 | return -EFAULT; | |
1632 | rtnl_lock(); | |
1633 | if (optname == MRT6_DEL_MFC) | |
6bd52143 | 1634 | ret = ip6mr_mfc_delete(mrt, &mfc); |
7bc570c8 | 1635 | else |
6bd52143 | 1636 | ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1637 | rtnl_unlock(); |
1638 | return ret; | |
1639 | ||
14fb64e1 YH |
1640 | /* |
1641 | * Control PIM assert (to activate pim will activate assert) | |
1642 | */ | |
1643 | case MRT6_ASSERT: | |
1644 | { | |
1645 | int v; | |
1646 | if (get_user(v, (int __user *)optval)) | |
1647 | return -EFAULT; | |
6bd52143 | 1648 | mrt->mroute_do_assert = !!v; |
14fb64e1 YH |
1649 | return 0; |
1650 | } | |
1651 | ||
1652 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1653 | case MRT6_PIM: | |
1654 | { | |
a9f83bf3 | 1655 | int v; |
14fb64e1 YH |
1656 | if (get_user(v, (int __user *)optval)) |
1657 | return -EFAULT; | |
1658 | v = !!v; | |
1659 | rtnl_lock(); | |
1660 | ret = 0; | |
6bd52143 PM |
1661 | if (v != mrt->mroute_do_pim) { |
1662 | mrt->mroute_do_pim = v; | |
1663 | mrt->mroute_do_assert = v; | |
14fb64e1 YH |
1664 | } |
1665 | rtnl_unlock(); | |
1666 | return ret; | |
1667 | } | |
1668 | ||
d1db275d PM |
1669 | #endif |
1670 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
1671 | case MRT6_TABLE: | |
1672 | { | |
1673 | u32 v; | |
1674 | ||
1675 | if (optlen != sizeof(u32)) | |
1676 | return -EINVAL; | |
1677 | if (get_user(v, (u32 __user *)optval)) | |
1678 | return -EFAULT; | |
1679 | if (sk == mrt->mroute6_sk) | |
1680 | return -EBUSY; | |
1681 | ||
1682 | rtnl_lock(); | |
1683 | ret = 0; | |
1684 | if (!ip6mr_new_table(net, v)) | |
1685 | ret = -ENOMEM; | |
1686 | raw6_sk(sk)->ip6mr_table = v; | |
1687 | rtnl_unlock(); | |
1688 | return ret; | |
1689 | } | |
14fb64e1 | 1690 | #endif |
7bc570c8 | 1691 | /* |
7d120c55 | 1692 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1693 | * set. |
1694 | */ | |
1695 | default: | |
1696 | return -ENOPROTOOPT; | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * Getsock opt support for the multicast routing system. | |
1702 | */ | |
1703 | ||
1704 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1705 | int __user *optlen) | |
1706 | { | |
1707 | int olr; | |
1708 | int val; | |
8229efda | 1709 | struct net *net = sock_net(sk); |
d1db275d PM |
1710 | struct mr6_table *mrt; |
1711 | ||
1712 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1713 | if (mrt == NULL) | |
1714 | return -ENOENT; | |
7bc570c8 YH |
1715 | |
1716 | switch (optname) { | |
1717 | case MRT6_VERSION: | |
1718 | val = 0x0305; | |
1719 | break; | |
14fb64e1 YH |
1720 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1721 | case MRT6_PIM: | |
6bd52143 | 1722 | val = mrt->mroute_do_pim; |
14fb64e1 YH |
1723 | break; |
1724 | #endif | |
1725 | case MRT6_ASSERT: | |
6bd52143 | 1726 | val = mrt->mroute_do_assert; |
14fb64e1 | 1727 | break; |
7bc570c8 YH |
1728 | default: |
1729 | return -ENOPROTOOPT; | |
1730 | } | |
1731 | ||
1732 | if (get_user(olr, optlen)) | |
1733 | return -EFAULT; | |
1734 | ||
1735 | olr = min_t(int, olr, sizeof(int)); | |
1736 | if (olr < 0) | |
1737 | return -EINVAL; | |
1738 | ||
1739 | if (put_user(olr, optlen)) | |
1740 | return -EFAULT; | |
1741 | if (copy_to_user(optval, &val, olr)) | |
1742 | return -EFAULT; | |
1743 | return 0; | |
1744 | } | |
1745 | ||
1746 | /* | |
1747 | * The IP multicast ioctl support routines. | |
1748 | */ | |
1749 | ||
1750 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1751 | { | |
1752 | struct sioc_sg_req6 sr; | |
1753 | struct sioc_mif_req6 vr; | |
1754 | struct mif_device *vif; | |
1755 | struct mfc6_cache *c; | |
8229efda | 1756 | struct net *net = sock_net(sk); |
d1db275d PM |
1757 | struct mr6_table *mrt; |
1758 | ||
1759 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1760 | if (mrt == NULL) | |
1761 | return -ENOENT; | |
7bc570c8 YH |
1762 | |
1763 | switch (cmd) { | |
1764 | case SIOCGETMIFCNT_IN6: | |
1765 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1766 | return -EFAULT; | |
6bd52143 | 1767 | if (vr.mifi >= mrt->maxvif) |
7bc570c8 YH |
1768 | return -EINVAL; |
1769 | read_lock(&mrt_lock); | |
6bd52143 PM |
1770 | vif = &mrt->vif6_table[vr.mifi]; |
1771 | if (MIF_EXISTS(mrt, vr.mifi)) { | |
7bc570c8 YH |
1772 | vr.icount = vif->pkt_in; |
1773 | vr.ocount = vif->pkt_out; | |
1774 | vr.ibytes = vif->bytes_in; | |
1775 | vr.obytes = vif->bytes_out; | |
1776 | read_unlock(&mrt_lock); | |
1777 | ||
1778 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1779 | return -EFAULT; | |
1780 | return 0; | |
1781 | } | |
1782 | read_unlock(&mrt_lock); | |
1783 | return -EADDRNOTAVAIL; | |
1784 | case SIOCGETSGCNT_IN6: | |
1785 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1786 | return -EFAULT; | |
1787 | ||
1788 | read_lock(&mrt_lock); | |
6bd52143 | 1789 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1790 | if (c) { |
1791 | sr.pktcnt = c->mfc_un.res.pkt; | |
1792 | sr.bytecnt = c->mfc_un.res.bytes; | |
1793 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1794 | read_unlock(&mrt_lock); | |
1795 | ||
1796 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1797 | return -EFAULT; | |
1798 | return 0; | |
1799 | } | |
1800 | read_unlock(&mrt_lock); | |
1801 | return -EADDRNOTAVAIL; | |
1802 | default: | |
1803 | return -ENOIOCTLCMD; | |
1804 | } | |
1805 | } | |
1806 | ||
1807 | ||
1808 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1809 | { | |
adf30907 | 1810 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1811 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
7bc570c8 YH |
1812 | return dst_output(skb); |
1813 | } | |
1814 | ||
1815 | /* | |
1816 | * Processing handlers for ip6mr_forward | |
1817 | */ | |
1818 | ||
6bd52143 PM |
1819 | static int ip6mr_forward2(struct net *net, struct mr6_table *mrt, |
1820 | struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
7bc570c8 YH |
1821 | { |
1822 | struct ipv6hdr *ipv6h; | |
6bd52143 | 1823 | struct mif_device *vif = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
1824 | struct net_device *dev; |
1825 | struct dst_entry *dst; | |
1826 | struct flowi fl; | |
1827 | ||
1828 | if (vif->dev == NULL) | |
1829 | goto out_free; | |
1830 | ||
14fb64e1 YH |
1831 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1832 | if (vif->flags & MIFF_REGISTER) { | |
1833 | vif->pkt_out++; | |
1834 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1835 | vif->dev->stats.tx_bytes += skb->len; |
1836 | vif->dev->stats.tx_packets++; | |
6bd52143 | 1837 | ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1838 | goto out_free; |
14fb64e1 YH |
1839 | } |
1840 | #endif | |
1841 | ||
7bc570c8 YH |
1842 | ipv6h = ipv6_hdr(skb); |
1843 | ||
1844 | fl = (struct flowi) { | |
1845 | .oif = vif->link, | |
1846 | .nl_u = { .ip6_u = | |
1847 | { .daddr = ipv6h->daddr, } | |
1848 | } | |
1849 | }; | |
1850 | ||
8229efda | 1851 | dst = ip6_route_output(net, NULL, &fl); |
7bc570c8 YH |
1852 | if (!dst) |
1853 | goto out_free; | |
1854 | ||
adf30907 ED |
1855 | skb_dst_drop(skb); |
1856 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1857 | |
1858 | /* | |
1859 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1860 | * not only before forwarding, but after forwarding on all output | |
1861 | * interfaces. It is clear, if mrouter runs a multicasting | |
1862 | * program, it should receive packets not depending to what interface | |
1863 | * program is joined. | |
1864 | * If we will not make it, the program will have to join on all | |
1865 | * interfaces. On the other hand, multihoming host (or router, but | |
1866 | * not mrouter) cannot join to more than one interface - it will | |
1867 | * result in receiving multiple packets. | |
1868 | */ | |
1869 | dev = vif->dev; | |
1870 | skb->dev = dev; | |
1871 | vif->pkt_out++; | |
1872 | vif->bytes_out += skb->len; | |
1873 | ||
1874 | /* We are about to write */ | |
1875 | /* XXX: extension headers? */ | |
1876 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1877 | goto out_free; | |
1878 | ||
1879 | ipv6h = ipv6_hdr(skb); | |
1880 | ipv6h->hop_limit--; | |
1881 | ||
1882 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1883 | ||
b2e0b385 | 1884 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, |
7bc570c8 YH |
1885 | ip6mr_forward2_finish); |
1886 | ||
1887 | out_free: | |
1888 | kfree_skb(skb); | |
1889 | return 0; | |
1890 | } | |
1891 | ||
6bd52143 | 1892 | static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev) |
7bc570c8 YH |
1893 | { |
1894 | int ct; | |
6bd52143 PM |
1895 | |
1896 | for (ct = mrt->maxvif - 1; ct >= 0; ct--) { | |
1897 | if (mrt->vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1898 | break; |
1899 | } | |
1900 | return ct; | |
1901 | } | |
1902 | ||
6bd52143 PM |
1903 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
1904 | struct sk_buff *skb, struct mfc6_cache *cache) | |
7bc570c8 YH |
1905 | { |
1906 | int psend = -1; | |
1907 | int vif, ct; | |
1908 | ||
1909 | vif = cache->mf6c_parent; | |
1910 | cache->mfc_un.res.pkt++; | |
1911 | cache->mfc_un.res.bytes += skb->len; | |
1912 | ||
14fb64e1 YH |
1913 | /* |
1914 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1915 | */ | |
6bd52143 | 1916 | if (mrt->vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
1917 | int true_vifi; |
1918 | ||
1919 | cache->mfc_un.res.wrong_if++; | |
6bd52143 | 1920 | true_vifi = ip6mr_find_vif(mrt, skb->dev); |
14fb64e1 | 1921 | |
6bd52143 | 1922 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
14fb64e1 YH |
1923 | /* pimsm uses asserts, when switching from RPT to SPT, |
1924 | so that we cannot check that packet arrived on an oif. | |
1925 | It is bad, but otherwise we would need to move pretty | |
1926 | large chunk of pimd to kernel. Ough... --ANK | |
1927 | */ | |
6bd52143 | 1928 | (mrt->mroute_do_pim || |
a21f3f99 | 1929 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
1930 | time_after(jiffies, |
1931 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
1932 | cache->mfc_un.res.last_assert = jiffies; | |
6bd52143 | 1933 | ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
1934 | } |
1935 | goto dont_forward; | |
1936 | } | |
1937 | ||
6bd52143 PM |
1938 | mrt->vif6_table[vif].pkt_in++; |
1939 | mrt->vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
1940 | |
1941 | /* | |
1942 | * Forward the frame | |
1943 | */ | |
1944 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
1945 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
1946 | if (psend != -1) { | |
1947 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1948 | if (skb2) | |
6bd52143 | 1949 | ip6mr_forward2(net, mrt, skb2, cache, psend); |
7bc570c8 YH |
1950 | } |
1951 | psend = ct; | |
1952 | } | |
1953 | } | |
1954 | if (psend != -1) { | |
6bd52143 | 1955 | ip6mr_forward2(net, mrt, skb, cache, psend); |
7bc570c8 YH |
1956 | return 0; |
1957 | } | |
1958 | ||
14fb64e1 | 1959 | dont_forward: |
7bc570c8 YH |
1960 | kfree_skb(skb); |
1961 | return 0; | |
1962 | } | |
1963 | ||
1964 | ||
1965 | /* | |
1966 | * Multicast packets for forwarding arrive here | |
1967 | */ | |
1968 | ||
1969 | int ip6_mr_input(struct sk_buff *skb) | |
1970 | { | |
1971 | struct mfc6_cache *cache; | |
8229efda | 1972 | struct net *net = dev_net(skb->dev); |
d1db275d PM |
1973 | struct mr6_table *mrt; |
1974 | struct flowi fl = { | |
1975 | .iif = skb->dev->ifindex, | |
1976 | .mark = skb->mark, | |
1977 | }; | |
1978 | int err; | |
1979 | ||
1980 | err = ip6mr_fib_lookup(net, &fl, &mrt); | |
1981 | if (err < 0) | |
1982 | return err; | |
7bc570c8 YH |
1983 | |
1984 | read_lock(&mrt_lock); | |
6bd52143 | 1985 | cache = ip6mr_cache_find(mrt, |
8229efda | 1986 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
7bc570c8 YH |
1987 | |
1988 | /* | |
1989 | * No usable cache entry | |
1990 | */ | |
1991 | if (cache == NULL) { | |
1992 | int vif; | |
1993 | ||
6bd52143 | 1994 | vif = ip6mr_find_vif(mrt, skb->dev); |
7bc570c8 | 1995 | if (vif >= 0) { |
6bd52143 | 1996 | int err = ip6mr_cache_unresolved(mrt, vif, skb); |
7bc570c8 YH |
1997 | read_unlock(&mrt_lock); |
1998 | ||
1999 | return err; | |
2000 | } | |
2001 | read_unlock(&mrt_lock); | |
2002 | kfree_skb(skb); | |
2003 | return -ENODEV; | |
2004 | } | |
2005 | ||
6bd52143 | 2006 | ip6_mr_forward(net, mrt, skb, cache); |
7bc570c8 YH |
2007 | |
2008 | read_unlock(&mrt_lock); | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | ||
5b285cac PM |
2014 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
2015 | struct mfc6_cache *c, struct rtmsg *rtm) | |
7bc570c8 YH |
2016 | { |
2017 | int ct; | |
2018 | struct rtnexthop *nhp; | |
549e028d | 2019 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
2020 | struct rtattr *mp_head; |
2021 | ||
7438189b | 2022 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2023 | if (c->mf6c_parent >= MAXMIFS) |
7438189b ND |
2024 | return -ENOENT; |
2025 | ||
6bd52143 PM |
2026 | if (MIF_EXISTS(mrt, c->mf6c_parent)) |
2027 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif6_table[c->mf6c_parent].dev->ifindex); | |
7bc570c8 YH |
2028 | |
2029 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
2030 | ||
2031 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
6bd52143 | 2032 | if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
7bc570c8 YH |
2033 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
2034 | goto rtattr_failure; | |
2035 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
2036 | nhp->rtnh_flags = 0; | |
2037 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
6bd52143 | 2038 | nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
2039 | nhp->rtnh_len = sizeof(*nhp); |
2040 | } | |
2041 | } | |
2042 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 2043 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
2044 | rtm->rtm_type = RTN_MULTICAST; |
2045 | return 1; | |
2046 | ||
2047 | rtattr_failure: | |
2048 | nlmsg_trim(skb, b); | |
2049 | return -EMSGSIZE; | |
2050 | } | |
2051 | ||
8229efda BT |
2052 | int ip6mr_get_route(struct net *net, |
2053 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
2054 | { |
2055 | int err; | |
d1db275d | 2056 | struct mr6_table *mrt; |
7bc570c8 | 2057 | struct mfc6_cache *cache; |
adf30907 | 2058 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 | 2059 | |
d1db275d PM |
2060 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
2061 | if (mrt == NULL) | |
2062 | return -ENOENT; | |
2063 | ||
7bc570c8 | 2064 | read_lock(&mrt_lock); |
6bd52143 | 2065 | cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
2066 | |
2067 | if (!cache) { | |
2068 | struct sk_buff *skb2; | |
2069 | struct ipv6hdr *iph; | |
2070 | struct net_device *dev; | |
2071 | int vif; | |
2072 | ||
2073 | if (nowait) { | |
2074 | read_unlock(&mrt_lock); | |
2075 | return -EAGAIN; | |
2076 | } | |
2077 | ||
2078 | dev = skb->dev; | |
6bd52143 | 2079 | if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) { |
7bc570c8 YH |
2080 | read_unlock(&mrt_lock); |
2081 | return -ENODEV; | |
2082 | } | |
2083 | ||
2084 | /* really correct? */ | |
2085 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
2086 | if (!skb2) { | |
2087 | read_unlock(&mrt_lock); | |
2088 | return -ENOMEM; | |
2089 | } | |
2090 | ||
2091 | skb_reset_transport_header(skb2); | |
2092 | ||
2093 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
2094 | skb_reset_network_header(skb2); | |
2095 | ||
2096 | iph = ipv6_hdr(skb2); | |
2097 | iph->version = 0; | |
2098 | iph->priority = 0; | |
2099 | iph->flow_lbl[0] = 0; | |
2100 | iph->flow_lbl[1] = 0; | |
2101 | iph->flow_lbl[2] = 0; | |
2102 | iph->payload_len = 0; | |
2103 | iph->nexthdr = IPPROTO_NONE; | |
2104 | iph->hop_limit = 0; | |
2105 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
2106 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
2107 | ||
6bd52143 | 2108 | err = ip6mr_cache_unresolved(mrt, vif, skb2); |
7bc570c8 YH |
2109 | read_unlock(&mrt_lock); |
2110 | ||
2111 | return err; | |
2112 | } | |
2113 | ||
2114 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
2115 | cache->mfc_flags |= MFC_NOTIFY; | |
2116 | ||
5b285cac | 2117 | err = __ip6mr_fill_mroute(mrt, skb, cache, rtm); |
7bc570c8 YH |
2118 | read_unlock(&mrt_lock); |
2119 | return err; | |
2120 | } | |
2121 | ||
5b285cac PM |
2122 | static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
2123 | u32 pid, u32 seq, struct mfc6_cache *c) | |
2124 | { | |
2125 | struct nlmsghdr *nlh; | |
2126 | struct rtmsg *rtm; | |
2127 | ||
2128 | nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); | |
2129 | if (nlh == NULL) | |
2130 | return -EMSGSIZE; | |
2131 | ||
2132 | rtm = nlmsg_data(nlh); | |
2133 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2134 | rtm->rtm_dst_len = 128; | |
2135 | rtm->rtm_src_len = 128; | |
2136 | rtm->rtm_tos = 0; | |
2137 | rtm->rtm_table = mrt->id; | |
2138 | NLA_PUT_U32(skb, RTA_TABLE, mrt->id); | |
2139 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2140 | rtm->rtm_protocol = RTPROT_UNSPEC; | |
2141 | rtm->rtm_flags = 0; | |
2142 | ||
2143 | NLA_PUT(skb, RTA_SRC, 16, &c->mf6c_origin); | |
2144 | NLA_PUT(skb, RTA_DST, 16, &c->mf6c_mcastgrp); | |
2145 | ||
2146 | if (__ip6mr_fill_mroute(mrt, skb, c, rtm) < 0) | |
2147 | goto nla_put_failure; | |
2148 | ||
2149 | return nlmsg_end(skb, nlh); | |
2150 | ||
2151 | nla_put_failure: | |
2152 | nlmsg_cancel(skb, nlh); | |
2153 | return -EMSGSIZE; | |
2154 | } | |
2155 | ||
2156 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) | |
2157 | { | |
2158 | struct net *net = sock_net(skb->sk); | |
2159 | struct mr6_table *mrt; | |
2160 | struct mfc6_cache *mfc; | |
2161 | unsigned int t = 0, s_t; | |
2162 | unsigned int h = 0, s_h; | |
2163 | unsigned int e = 0, s_e; | |
2164 | ||
2165 | s_t = cb->args[0]; | |
2166 | s_h = cb->args[1]; | |
2167 | s_e = cb->args[2]; | |
2168 | ||
2169 | read_lock(&mrt_lock); | |
2170 | ip6mr_for_each_table(mrt, net) { | |
2171 | if (t < s_t) | |
2172 | goto next_table; | |
2173 | if (t > s_t) | |
2174 | s_h = 0; | |
2175 | for (h = s_h; h < MFC6_LINES; h++) { | |
2176 | list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) { | |
2177 | if (e < s_e) | |
2178 | goto next_entry; | |
2179 | if (ip6mr_fill_mroute(mrt, skb, | |
2180 | NETLINK_CB(cb->skb).pid, | |
2181 | cb->nlh->nlmsg_seq, | |
2182 | mfc) < 0) | |
2183 | goto done; | |
2184 | next_entry: | |
2185 | e++; | |
2186 | } | |
2187 | e = s_e = 0; | |
2188 | } | |
2189 | s_h = 0; | |
2190 | next_table: | |
2191 | t++; | |
2192 | } | |
2193 | done: | |
2194 | read_unlock(&mrt_lock); | |
2195 | ||
2196 | cb->args[2] = e; | |
2197 | cb->args[1] = h; | |
2198 | cb->args[0] = t; | |
2199 | ||
2200 | return skb->len; | |
2201 | } |