Commit | Line | Data |
---|---|---|
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> |
e2d57766 | 37 | #include <linux/compat.h> |
7bc570c8 YH |
38 | #include <net/protocol.h> |
39 | #include <linux/skbuff.h> | |
40 | #include <net/sock.h> | |
7bc570c8 | 41 | #include <net/raw.h> |
7bc570c8 YH |
42 | #include <linux/notifier.h> |
43 | #include <linux/if_arp.h> | |
7bc570c8 YH |
44 | #include <net/checksum.h> |
45 | #include <net/netlink.h> | |
d1db275d | 46 | #include <net/fib_rules.h> |
7bc570c8 YH |
47 | |
48 | #include <net/ipv6.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <linux/mroute6.h> | |
14fb64e1 | 51 | #include <linux/pim.h> |
7bc570c8 YH |
52 | #include <net/addrconf.h> |
53 | #include <linux/netfilter_ipv6.h> | |
5d6e430d | 54 | #include <net/ip6_checksum.h> |
7bc570c8 | 55 | |
6bd52143 | 56 | struct mr6_table { |
d1db275d | 57 | struct list_head list; |
6bd52143 PM |
58 | #ifdef CONFIG_NET_NS |
59 | struct net *net; | |
60 | #endif | |
d1db275d | 61 | u32 id; |
6bd52143 PM |
62 | struct sock *mroute6_sk; |
63 | struct timer_list ipmr_expire_timer; | |
64 | struct list_head mfc6_unres_queue; | |
65 | struct list_head mfc6_cache_array[MFC6_LINES]; | |
66 | struct mif_device vif6_table[MAXMIFS]; | |
67 | int maxvif; | |
68 | atomic_t cache_resolve_queue_len; | |
69 | int mroute_do_assert; | |
70 | int mroute_do_pim; | |
71 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
72 | int mroute_reg_vif_num; | |
73 | #endif | |
74 | }; | |
75 | ||
d1db275d PM |
76 | struct ip6mr_rule { |
77 | struct fib_rule common; | |
78 | }; | |
79 | ||
80 | struct ip6mr_result { | |
81 | struct mr6_table *mrt; | |
82 | }; | |
83 | ||
7bc570c8 YH |
84 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
85 | Note that the changes are semaphored via rtnl_lock. | |
86 | */ | |
87 | ||
88 | static DEFINE_RWLOCK(mrt_lock); | |
89 | ||
90 | /* | |
91 | * Multicast router control variables | |
92 | */ | |
93 | ||
6bd52143 | 94 | #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL) |
7bc570c8 | 95 | |
7bc570c8 YH |
96 | /* Special spinlock for queue of unresolved entries */ |
97 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
98 | ||
99 | /* We return to original Alan's scheme. Hash table of resolved | |
100 | entries is changed only in process context and protected | |
101 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
102 | with strong spinlock mfc_unres_lock. | |
103 | ||
104 | In this case data path is free of exclusive locks at all. | |
105 | */ | |
106 | ||
107 | static struct kmem_cache *mrt_cachep __read_mostly; | |
108 | ||
d1db275d PM |
109 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id); |
110 | static void ip6mr_free_table(struct mr6_table *mrt); | |
111 | ||
6bd52143 PM |
112 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
113 | struct sk_buff *skb, struct mfc6_cache *cache); | |
114 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, | |
8229efda | 115 | mifi_t mifi, int assert); |
5b285cac PM |
116 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
117 | struct mfc6_cache *c, struct rtmsg *rtm); | |
118 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, | |
119 | struct netlink_callback *cb); | |
6bd52143 | 120 | static void mroute_clean_tables(struct mr6_table *mrt); |
d1db275d PM |
121 | static void ipmr_expire_process(unsigned long arg); |
122 | ||
123 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
8ffb335e | 124 | #define ip6mr_for_each_table(mrt, net) \ |
d1db275d PM |
125 | list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list) |
126 | ||
127 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) | |
128 | { | |
129 | struct mr6_table *mrt; | |
130 | ||
131 | ip6mr_for_each_table(mrt, net) { | |
132 | if (mrt->id == id) | |
133 | return mrt; | |
134 | } | |
135 | return NULL; | |
136 | } | |
137 | ||
4c9483b2 | 138 | static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
d1db275d PM |
139 | struct mr6_table **mrt) |
140 | { | |
141 | struct ip6mr_result res; | |
142 | struct fib_lookup_arg arg = { .result = &res, }; | |
143 | int err; | |
144 | ||
4c9483b2 DM |
145 | err = fib_rules_lookup(net->ipv6.mr6_rules_ops, |
146 | flowi6_to_flowi(flp6), 0, &arg); | |
d1db275d PM |
147 | if (err < 0) |
148 | return err; | |
149 | *mrt = res.mrt; | |
150 | return 0; | |
151 | } | |
152 | ||
153 | static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
154 | int flags, struct fib_lookup_arg *arg) | |
155 | { | |
156 | struct ip6mr_result *res = arg->result; | |
157 | struct mr6_table *mrt; | |
158 | ||
159 | switch (rule->action) { | |
160 | case FR_ACT_TO_TBL: | |
161 | break; | |
162 | case FR_ACT_UNREACHABLE: | |
163 | return -ENETUNREACH; | |
164 | case FR_ACT_PROHIBIT: | |
165 | return -EACCES; | |
166 | case FR_ACT_BLACKHOLE: | |
167 | default: | |
168 | return -EINVAL; | |
169 | } | |
170 | ||
171 | mrt = ip6mr_get_table(rule->fr_net, rule->table); | |
172 | if (mrt == NULL) | |
173 | return -EAGAIN; | |
174 | res->mrt = mrt; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) | |
179 | { | |
180 | return 1; | |
181 | } | |
182 | ||
183 | static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = { | |
184 | FRA_GENERIC_POLICY, | |
185 | }; | |
186 | ||
187 | static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
188 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
189 | { | |
190 | return 0; | |
191 | } | |
192 | ||
193 | static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
194 | struct nlattr **tb) | |
195 | { | |
196 | return 1; | |
197 | } | |
198 | ||
199 | static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
200 | struct fib_rule_hdr *frh) | |
201 | { | |
202 | frh->dst_len = 0; | |
203 | frh->src_len = 0; | |
204 | frh->tos = 0; | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static const struct fib_rules_ops __net_initdata ip6mr_rules_ops_template = { | |
209 | .family = RTNL_FAMILY_IP6MR, | |
210 | .rule_size = sizeof(struct ip6mr_rule), | |
211 | .addr_size = sizeof(struct in6_addr), | |
212 | .action = ip6mr_rule_action, | |
213 | .match = ip6mr_rule_match, | |
214 | .configure = ip6mr_rule_configure, | |
215 | .compare = ip6mr_rule_compare, | |
216 | .default_pref = fib_default_rule_pref, | |
217 | .fill = ip6mr_rule_fill, | |
218 | .nlgroup = RTNLGRP_IPV6_RULE, | |
219 | .policy = ip6mr_rule_policy, | |
220 | .owner = THIS_MODULE, | |
221 | }; | |
222 | ||
223 | static int __net_init ip6mr_rules_init(struct net *net) | |
224 | { | |
225 | struct fib_rules_ops *ops; | |
226 | struct mr6_table *mrt; | |
227 | int err; | |
228 | ||
229 | ops = fib_rules_register(&ip6mr_rules_ops_template, net); | |
230 | if (IS_ERR(ops)) | |
231 | return PTR_ERR(ops); | |
232 | ||
233 | INIT_LIST_HEAD(&net->ipv6.mr6_tables); | |
234 | ||
235 | mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); | |
236 | if (mrt == NULL) { | |
237 | err = -ENOMEM; | |
238 | goto err1; | |
239 | } | |
240 | ||
241 | err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); | |
242 | if (err < 0) | |
243 | goto err2; | |
244 | ||
245 | net->ipv6.mr6_rules_ops = ops; | |
246 | return 0; | |
247 | ||
248 | err2: | |
249 | kfree(mrt); | |
250 | err1: | |
251 | fib_rules_unregister(ops); | |
252 | return err; | |
253 | } | |
254 | ||
255 | static void __net_exit ip6mr_rules_exit(struct net *net) | |
256 | { | |
257 | struct mr6_table *mrt, *next; | |
258 | ||
035320d5 ED |
259 | list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { |
260 | list_del(&mrt->list); | |
d1db275d | 261 | ip6mr_free_table(mrt); |
035320d5 | 262 | } |
d1db275d PM |
263 | fib_rules_unregister(net->ipv6.mr6_rules_ops); |
264 | } | |
265 | #else | |
266 | #define ip6mr_for_each_table(mrt, net) \ | |
267 | for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) | |
268 | ||
269 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) | |
270 | { | |
271 | return net->ipv6.mrt6; | |
272 | } | |
273 | ||
4c9483b2 | 274 | static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
d1db275d PM |
275 | struct mr6_table **mrt) |
276 | { | |
277 | *mrt = net->ipv6.mrt6; | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static int __net_init ip6mr_rules_init(struct net *net) | |
282 | { | |
283 | net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT); | |
284 | return net->ipv6.mrt6 ? 0 : -ENOMEM; | |
285 | } | |
286 | ||
287 | static void __net_exit ip6mr_rules_exit(struct net *net) | |
288 | { | |
289 | ip6mr_free_table(net->ipv6.mrt6); | |
290 | } | |
291 | #endif | |
292 | ||
293 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id) | |
294 | { | |
295 | struct mr6_table *mrt; | |
296 | unsigned int i; | |
297 | ||
298 | mrt = ip6mr_get_table(net, id); | |
299 | if (mrt != NULL) | |
300 | return mrt; | |
301 | ||
302 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
303 | if (mrt == NULL) | |
304 | return NULL; | |
305 | mrt->id = id; | |
306 | write_pnet(&mrt->net, net); | |
307 | ||
308 | /* Forwarding cache */ | |
309 | for (i = 0; i < MFC6_LINES; i++) | |
310 | INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]); | |
311 | ||
312 | INIT_LIST_HEAD(&mrt->mfc6_unres_queue); | |
313 | ||
314 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
315 | (unsigned long)mrt); | |
316 | ||
317 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
318 | mrt->mroute_reg_vif_num = -1; | |
319 | #endif | |
320 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
321 | list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); | |
322 | #endif | |
323 | return mrt; | |
324 | } | |
7bc570c8 | 325 | |
d1db275d PM |
326 | static void ip6mr_free_table(struct mr6_table *mrt) |
327 | { | |
328 | del_timer(&mrt->ipmr_expire_timer); | |
329 | mroute_clean_tables(mrt); | |
330 | kfree(mrt); | |
331 | } | |
7bc570c8 YH |
332 | |
333 | #ifdef CONFIG_PROC_FS | |
334 | ||
335 | struct ipmr_mfc_iter { | |
8b90fc7e | 336 | struct seq_net_private p; |
d1db275d | 337 | struct mr6_table *mrt; |
f30a7784 | 338 | struct list_head *cache; |
7bc570c8 YH |
339 | int ct; |
340 | }; | |
341 | ||
342 | ||
8b90fc7e BT |
343 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
344 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 | 345 | { |
d1db275d | 346 | struct mr6_table *mrt = it->mrt; |
7bc570c8 YH |
347 | struct mfc6_cache *mfc; |
348 | ||
7bc570c8 | 349 | read_lock(&mrt_lock); |
f30a7784 | 350 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) { |
6bd52143 | 351 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 | 352 | list_for_each_entry(mfc, it->cache, list) |
7bc570c8 YH |
353 | if (pos-- == 0) |
354 | return mfc; | |
f30a7784 | 355 | } |
7bc570c8 YH |
356 | read_unlock(&mrt_lock); |
357 | ||
7bc570c8 | 358 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 359 | it->cache = &mrt->mfc6_unres_queue; |
f30a7784 | 360 | list_for_each_entry(mfc, it->cache, list) |
c476efbc | 361 | if (pos-- == 0) |
7bc570c8 YH |
362 | return mfc; |
363 | spin_unlock_bh(&mfc_unres_lock); | |
364 | ||
365 | it->cache = NULL; | |
366 | return NULL; | |
367 | } | |
368 | ||
7bc570c8 YH |
369 | /* |
370 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
371 | */ | |
372 | ||
373 | struct ipmr_vif_iter { | |
8b90fc7e | 374 | struct seq_net_private p; |
d1db275d | 375 | struct mr6_table *mrt; |
7bc570c8 YH |
376 | int ct; |
377 | }; | |
378 | ||
8b90fc7e BT |
379 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
380 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
381 | loff_t pos) |
382 | { | |
d1db275d | 383 | struct mr6_table *mrt = iter->mrt; |
6bd52143 PM |
384 | |
385 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
386 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 YH |
387 | continue; |
388 | if (pos-- == 0) | |
6bd52143 | 389 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
390 | } |
391 | return NULL; | |
392 | } | |
393 | ||
394 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
395 | __acquires(mrt_lock) | |
396 | { | |
d1db275d | 397 | struct ipmr_vif_iter *iter = seq->private; |
8b90fc7e | 398 | struct net *net = seq_file_net(seq); |
d1db275d PM |
399 | struct mr6_table *mrt; |
400 | ||
401 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); | |
402 | if (mrt == NULL) | |
403 | return ERR_PTR(-ENOENT); | |
404 | ||
405 | iter->mrt = mrt; | |
8b90fc7e | 406 | |
7bc570c8 | 407 | read_lock(&mrt_lock); |
8b90fc7e BT |
408 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
409 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
410 | } |
411 | ||
412 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
413 | { | |
414 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 415 | struct net *net = seq_file_net(seq); |
d1db275d | 416 | struct mr6_table *mrt = iter->mrt; |
7bc570c8 YH |
417 | |
418 | ++*pos; | |
419 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 420 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 421 | |
6bd52143 PM |
422 | while (++iter->ct < mrt->maxvif) { |
423 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 | 424 | continue; |
6bd52143 | 425 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
426 | } |
427 | return NULL; | |
428 | } | |
429 | ||
430 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
431 | __releases(mrt_lock) | |
432 | { | |
433 | read_unlock(&mrt_lock); | |
434 | } | |
435 | ||
436 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
437 | { | |
d1db275d PM |
438 | struct ipmr_vif_iter *iter = seq->private; |
439 | struct mr6_table *mrt = iter->mrt; | |
8b90fc7e | 440 | |
7bc570c8 YH |
441 | if (v == SEQ_START_TOKEN) { |
442 | seq_puts(seq, | |
443 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
444 | } else { | |
445 | const struct mif_device *vif = v; | |
446 | const char *name = vif->dev ? vif->dev->name : "none"; | |
447 | ||
448 | seq_printf(seq, | |
d430a227 | 449 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
6bd52143 | 450 | vif - mrt->vif6_table, |
7bc570c8 YH |
451 | name, vif->bytes_in, vif->pkt_in, |
452 | vif->bytes_out, vif->pkt_out, | |
453 | vif->flags); | |
454 | } | |
455 | return 0; | |
456 | } | |
457 | ||
98147d52 | 458 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
459 | .start = ip6mr_vif_seq_start, |
460 | .next = ip6mr_vif_seq_next, | |
461 | .stop = ip6mr_vif_seq_stop, | |
462 | .show = ip6mr_vif_seq_show, | |
463 | }; | |
464 | ||
465 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
466 | { | |
8b90fc7e BT |
467 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
468 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
469 | } |
470 | ||
5ca1b998 | 471 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
472 | .owner = THIS_MODULE, |
473 | .open = ip6mr_vif_open, | |
474 | .read = seq_read, | |
475 | .llseek = seq_lseek, | |
8b90fc7e | 476 | .release = seq_release_net, |
7bc570c8 YH |
477 | }; |
478 | ||
479 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
480 | { | |
d1db275d | 481 | struct ipmr_mfc_iter *it = seq->private; |
8b90fc7e | 482 | struct net *net = seq_file_net(seq); |
d1db275d | 483 | struct mr6_table *mrt; |
8b90fc7e | 484 | |
d1db275d PM |
485 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
486 | if (mrt == NULL) | |
487 | return ERR_PTR(-ENOENT); | |
488 | ||
489 | it->mrt = mrt; | |
8b90fc7e BT |
490 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
491 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
492 | } |
493 | ||
494 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
495 | { | |
496 | struct mfc6_cache *mfc = v; | |
497 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 498 | struct net *net = seq_file_net(seq); |
d1db275d | 499 | struct mr6_table *mrt = it->mrt; |
7bc570c8 YH |
500 | |
501 | ++*pos; | |
502 | ||
503 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 504 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 | 505 | |
f30a7784 PM |
506 | if (mfc->list.next != it->cache) |
507 | return list_entry(mfc->list.next, struct mfc6_cache, list); | |
7bc570c8 | 508 | |
6bd52143 | 509 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 YH |
510 | goto end_of_list; |
511 | ||
6bd52143 | 512 | BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]); |
7bc570c8 | 513 | |
4a6258a0 | 514 | while (++it->ct < MFC6_LINES) { |
6bd52143 | 515 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 PM |
516 | if (list_empty(it->cache)) |
517 | continue; | |
518 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
519 | } |
520 | ||
521 | /* exhausted cache_array, show unresolved */ | |
522 | read_unlock(&mrt_lock); | |
6bd52143 | 523 | it->cache = &mrt->mfc6_unres_queue; |
7bc570c8 YH |
524 | it->ct = 0; |
525 | ||
526 | spin_lock_bh(&mfc_unres_lock); | |
f30a7784 PM |
527 | if (!list_empty(it->cache)) |
528 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
529 | |
530 | end_of_list: | |
531 | spin_unlock_bh(&mfc_unres_lock); | |
532 | it->cache = NULL; | |
533 | ||
534 | return NULL; | |
535 | } | |
536 | ||
537 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
538 | { | |
539 | struct ipmr_mfc_iter *it = seq->private; | |
d1db275d | 540 | struct mr6_table *mrt = it->mrt; |
7bc570c8 | 541 | |
6bd52143 | 542 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 | 543 | spin_unlock_bh(&mfc_unres_lock); |
6bd52143 | 544 | else if (it->cache == mrt->mfc6_cache_array) |
7bc570c8 YH |
545 | read_unlock(&mrt_lock); |
546 | } | |
547 | ||
548 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
549 | { | |
550 | int n; | |
551 | ||
552 | if (v == SEQ_START_TOKEN) { | |
553 | seq_puts(seq, | |
554 | "Group " | |
555 | "Origin " | |
556 | "Iif Pkts Bytes Wrong Oifs\n"); | |
557 | } else { | |
558 | const struct mfc6_cache *mfc = v; | |
559 | const struct ipmr_mfc_iter *it = seq->private; | |
d1db275d | 560 | struct mr6_table *mrt = it->mrt; |
7bc570c8 | 561 | |
999890b2 | 562 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 563 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 564 | mfc->mf6c_parent); |
7bc570c8 | 565 | |
6bd52143 | 566 | if (it->cache != &mrt->mfc6_unres_queue) { |
1ea472e2 BT |
567 | seq_printf(seq, " %8lu %8lu %8lu", |
568 | mfc->mfc_un.res.pkt, | |
569 | mfc->mfc_un.res.bytes, | |
570 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
571 | for (n = mfc->mfc_un.res.minvif; |
572 | n < mfc->mfc_un.res.maxvif; n++) { | |
6bd52143 | 573 | if (MIF_EXISTS(mrt, n) && |
7bc570c8 YH |
574 | mfc->mfc_un.res.ttls[n] < 255) |
575 | seq_printf(seq, | |
576 | " %2d:%-3d", | |
577 | n, mfc->mfc_un.res.ttls[n]); | |
578 | } | |
1ea472e2 BT |
579 | } else { |
580 | /* unresolved mfc_caches don't contain | |
581 | * pkt, bytes and wrong_if values | |
582 | */ | |
583 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
584 | } |
585 | seq_putc(seq, '\n'); | |
586 | } | |
587 | return 0; | |
588 | } | |
589 | ||
88e9d34c | 590 | static const struct seq_operations ipmr_mfc_seq_ops = { |
7bc570c8 YH |
591 | .start = ipmr_mfc_seq_start, |
592 | .next = ipmr_mfc_seq_next, | |
593 | .stop = ipmr_mfc_seq_stop, | |
594 | .show = ipmr_mfc_seq_show, | |
595 | }; | |
596 | ||
597 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
598 | { | |
8b90fc7e BT |
599 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
600 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
601 | } |
602 | ||
5ca1b998 | 603 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
604 | .owner = THIS_MODULE, |
605 | .open = ipmr_mfc_open, | |
606 | .read = seq_read, | |
607 | .llseek = seq_lseek, | |
8b90fc7e | 608 | .release = seq_release_net, |
7bc570c8 YH |
609 | }; |
610 | #endif | |
611 | ||
14fb64e1 | 612 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
613 | |
614 | static int pim6_rcv(struct sk_buff *skb) | |
615 | { | |
616 | struct pimreghdr *pim; | |
617 | struct ipv6hdr *encap; | |
618 | struct net_device *reg_dev = NULL; | |
8229efda | 619 | struct net *net = dev_net(skb->dev); |
d1db275d | 620 | struct mr6_table *mrt; |
4c9483b2 DM |
621 | struct flowi6 fl6 = { |
622 | .flowi6_iif = skb->dev->ifindex, | |
623 | .flowi6_mark = skb->mark, | |
d1db275d PM |
624 | }; |
625 | int reg_vif_num; | |
14fb64e1 YH |
626 | |
627 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
628 | goto drop; | |
629 | ||
630 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
631 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
632 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
633 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
634 | sizeof(*pim), IPPROTO_PIM, | |
635 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 636 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
637 | goto drop; |
638 | ||
639 | /* check if the inner packet is destined to mcast group */ | |
640 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
641 | sizeof(*pim)); | |
642 | ||
643 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
644 | encap->payload_len == 0 || | |
645 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
646 | goto drop; | |
647 | ||
4c9483b2 | 648 | if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
d1db275d PM |
649 | goto drop; |
650 | reg_vif_num = mrt->mroute_reg_vif_num; | |
651 | ||
14fb64e1 YH |
652 | read_lock(&mrt_lock); |
653 | if (reg_vif_num >= 0) | |
6bd52143 | 654 | reg_dev = mrt->vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
655 | if (reg_dev) |
656 | dev_hold(reg_dev); | |
657 | read_unlock(&mrt_lock); | |
658 | ||
659 | if (reg_dev == NULL) | |
660 | goto drop; | |
661 | ||
662 | skb->mac_header = skb->network_header; | |
663 | skb_pull(skb, (u8 *)encap - skb->data); | |
664 | skb_reset_network_header(skb); | |
1d6e55f1 | 665 | skb->protocol = htons(ETH_P_IPV6); |
3e49e6d5 | 666 | skb->ip_summed = CHECKSUM_NONE; |
14fb64e1 | 667 | skb->pkt_type = PACKET_HOST; |
d19d56dd ED |
668 | |
669 | skb_tunnel_rx(skb, reg_dev); | |
670 | ||
caf586e5 | 671 | netif_rx(skb); |
8990f468 | 672 | |
14fb64e1 YH |
673 | dev_put(reg_dev); |
674 | return 0; | |
675 | drop: | |
676 | kfree_skb(skb); | |
677 | return 0; | |
678 | } | |
679 | ||
41135cc8 | 680 | static const struct inet6_protocol pim6_protocol = { |
14fb64e1 YH |
681 | .handler = pim6_rcv, |
682 | }; | |
683 | ||
684 | /* Service routines creating virtual interfaces: PIMREG */ | |
685 | ||
6fef4c0c SH |
686 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
687 | struct net_device *dev) | |
14fb64e1 | 688 | { |
8229efda | 689 | struct net *net = dev_net(dev); |
d1db275d | 690 | struct mr6_table *mrt; |
4c9483b2 DM |
691 | struct flowi6 fl6 = { |
692 | .flowi6_oif = dev->ifindex, | |
693 | .flowi6_iif = skb->skb_iif, | |
694 | .flowi6_mark = skb->mark, | |
d1db275d PM |
695 | }; |
696 | int err; | |
697 | ||
4c9483b2 | 698 | err = ip6mr_fib_lookup(net, &fl6, &mrt); |
d1db275d PM |
699 | if (err < 0) |
700 | return err; | |
8229efda | 701 | |
14fb64e1 | 702 | read_lock(&mrt_lock); |
dc58c78c PE |
703 | dev->stats.tx_bytes += skb->len; |
704 | dev->stats.tx_packets++; | |
6bd52143 | 705 | ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); |
14fb64e1 YH |
706 | read_unlock(&mrt_lock); |
707 | kfree_skb(skb); | |
6ed10654 | 708 | return NETDEV_TX_OK; |
14fb64e1 YH |
709 | } |
710 | ||
007c3838 SH |
711 | static const struct net_device_ops reg_vif_netdev_ops = { |
712 | .ndo_start_xmit = reg_vif_xmit, | |
713 | }; | |
714 | ||
14fb64e1 YH |
715 | static void reg_vif_setup(struct net_device *dev) |
716 | { | |
717 | dev->type = ARPHRD_PIMREG; | |
718 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
719 | dev->flags = IFF_NOARP; | |
007c3838 | 720 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 721 | dev->destructor = free_netdev; |
403dbb97 | 722 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
723 | } |
724 | ||
d1db275d | 725 | static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt) |
14fb64e1 YH |
726 | { |
727 | struct net_device *dev; | |
d1db275d PM |
728 | char name[IFNAMSIZ]; |
729 | ||
730 | if (mrt->id == RT6_TABLE_DFLT) | |
731 | sprintf(name, "pim6reg"); | |
732 | else | |
733 | sprintf(name, "pim6reg%u", mrt->id); | |
14fb64e1 | 734 | |
d1db275d | 735 | dev = alloc_netdev(0, name, reg_vif_setup); |
14fb64e1 YH |
736 | if (dev == NULL) |
737 | return NULL; | |
738 | ||
8229efda BT |
739 | dev_net_set(dev, net); |
740 | ||
14fb64e1 YH |
741 | if (register_netdevice(dev)) { |
742 | free_netdev(dev); | |
743 | return NULL; | |
744 | } | |
745 | dev->iflink = 0; | |
746 | ||
14fb64e1 YH |
747 | if (dev_open(dev)) |
748 | goto failure; | |
749 | ||
7af3db78 | 750 | dev_hold(dev); |
14fb64e1 YH |
751 | return dev; |
752 | ||
753 | failure: | |
754 | /* allow the register to be completed before unregistering. */ | |
755 | rtnl_unlock(); | |
756 | rtnl_lock(); | |
757 | ||
758 | unregister_netdevice(dev); | |
759 | return NULL; | |
760 | } | |
761 | #endif | |
762 | ||
7bc570c8 YH |
763 | /* |
764 | * Delete a VIF entry | |
765 | */ | |
766 | ||
6bd52143 | 767 | static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head) |
7bc570c8 YH |
768 | { |
769 | struct mif_device *v; | |
770 | struct net_device *dev; | |
1d6e55f1 | 771 | struct inet6_dev *in6_dev; |
6bd52143 PM |
772 | |
773 | if (vifi < 0 || vifi >= mrt->maxvif) | |
7bc570c8 YH |
774 | return -EADDRNOTAVAIL; |
775 | ||
6bd52143 | 776 | v = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
777 | |
778 | write_lock_bh(&mrt_lock); | |
779 | dev = v->dev; | |
780 | v->dev = NULL; | |
781 | ||
782 | if (!dev) { | |
783 | write_unlock_bh(&mrt_lock); | |
784 | return -EADDRNOTAVAIL; | |
785 | } | |
786 | ||
14fb64e1 | 787 | #ifdef CONFIG_IPV6_PIMSM_V2 |
6bd52143 PM |
788 | if (vifi == mrt->mroute_reg_vif_num) |
789 | mrt->mroute_reg_vif_num = -1; | |
14fb64e1 YH |
790 | #endif |
791 | ||
6bd52143 | 792 | if (vifi + 1 == mrt->maxvif) { |
7bc570c8 YH |
793 | int tmp; |
794 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
6bd52143 | 795 | if (MIF_EXISTS(mrt, tmp)) |
7bc570c8 YH |
796 | break; |
797 | } | |
6bd52143 | 798 | mrt->maxvif = tmp + 1; |
7bc570c8 YH |
799 | } |
800 | ||
801 | write_unlock_bh(&mrt_lock); | |
802 | ||
803 | dev_set_allmulti(dev, -1); | |
804 | ||
1d6e55f1 TG |
805 | in6_dev = __in6_dev_get(dev); |
806 | if (in6_dev) | |
807 | in6_dev->cnf.mc_forwarding--; | |
808 | ||
7bc570c8 | 809 | if (v->flags & MIFF_REGISTER) |
c871e664 | 810 | unregister_netdevice_queue(dev, head); |
7bc570c8 YH |
811 | |
812 | dev_put(dev); | |
813 | return 0; | |
814 | } | |
815 | ||
58701ad4 BT |
816 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
817 | { | |
58701ad4 BT |
818 | kmem_cache_free(mrt_cachep, c); |
819 | } | |
820 | ||
7bc570c8 YH |
821 | /* Destroy an unresolved cache entry, killing queued skbs |
822 | and reporting error to netlink readers. | |
823 | */ | |
824 | ||
6bd52143 | 825 | static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c) |
7bc570c8 | 826 | { |
6bd52143 | 827 | struct net *net = read_pnet(&mrt->net); |
7bc570c8 YH |
828 | struct sk_buff *skb; |
829 | ||
6bd52143 | 830 | atomic_dec(&mrt->cache_resolve_queue_len); |
7bc570c8 YH |
831 | |
832 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
833 | if (ipv6_hdr(skb)->version == 0) { | |
834 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
835 | nlh->nlmsg_type = NLMSG_ERROR; | |
836 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
837 | skb_trim(skb, nlh->nlmsg_len); | |
838 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
8229efda | 839 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 YH |
840 | } else |
841 | kfree_skb(skb); | |
842 | } | |
843 | ||
58701ad4 | 844 | ip6mr_cache_free(c); |
7bc570c8 YH |
845 | } |
846 | ||
847 | ||
c476efbc | 848 | /* Timer process for all the unresolved queue. */ |
7bc570c8 | 849 | |
6bd52143 | 850 | static void ipmr_do_expire_process(struct mr6_table *mrt) |
7bc570c8 YH |
851 | { |
852 | unsigned long now = jiffies; | |
853 | unsigned long expires = 10 * HZ; | |
f30a7784 | 854 | struct mfc6_cache *c, *next; |
7bc570c8 | 855 | |
6bd52143 | 856 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
7bc570c8 YH |
857 | if (time_after(c->mfc_un.unres.expires, now)) { |
858 | /* not yet... */ | |
859 | unsigned long interval = c->mfc_un.unres.expires - now; | |
860 | if (interval < expires) | |
861 | expires = interval; | |
7bc570c8 YH |
862 | continue; |
863 | } | |
864 | ||
f30a7784 | 865 | list_del(&c->list); |
6bd52143 | 866 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
867 | } |
868 | ||
6bd52143 PM |
869 | if (!list_empty(&mrt->mfc6_unres_queue)) |
870 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
7bc570c8 YH |
871 | } |
872 | ||
c476efbc | 873 | static void ipmr_expire_process(unsigned long arg) |
7bc570c8 | 874 | { |
6bd52143 | 875 | struct mr6_table *mrt = (struct mr6_table *)arg; |
c476efbc | 876 | |
7bc570c8 | 877 | if (!spin_trylock(&mfc_unres_lock)) { |
6bd52143 | 878 | mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); |
7bc570c8 YH |
879 | return; |
880 | } | |
881 | ||
6bd52143 PM |
882 | if (!list_empty(&mrt->mfc6_unres_queue)) |
883 | ipmr_do_expire_process(mrt); | |
7bc570c8 YH |
884 | |
885 | spin_unlock(&mfc_unres_lock); | |
886 | } | |
887 | ||
888 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
889 | ||
6bd52143 | 890 | static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache, |
b5aa30b1 | 891 | unsigned char *ttls) |
7bc570c8 YH |
892 | { |
893 | int vifi; | |
894 | ||
6ac7eb08 | 895 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 896 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 897 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 898 | |
6bd52143 PM |
899 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
900 | if (MIF_EXISTS(mrt, vifi) && | |
4e16880c | 901 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
902 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
903 | if (cache->mfc_un.res.minvif > vifi) | |
904 | cache->mfc_un.res.minvif = vifi; | |
905 | if (cache->mfc_un.res.maxvif <= vifi) | |
906 | cache->mfc_un.res.maxvif = vifi + 1; | |
907 | } | |
908 | } | |
909 | } | |
910 | ||
6bd52143 PM |
911 | static int mif6_add(struct net *net, struct mr6_table *mrt, |
912 | struct mif6ctl *vifc, int mrtsock) | |
7bc570c8 YH |
913 | { |
914 | int vifi = vifc->mif6c_mifi; | |
6bd52143 | 915 | struct mif_device *v = &mrt->vif6_table[vifi]; |
7bc570c8 | 916 | struct net_device *dev; |
1d6e55f1 | 917 | struct inet6_dev *in6_dev; |
5ae7b444 | 918 | int err; |
7bc570c8 YH |
919 | |
920 | /* Is vif busy ? */ | |
6bd52143 | 921 | if (MIF_EXISTS(mrt, vifi)) |
7bc570c8 YH |
922 | return -EADDRINUSE; |
923 | ||
924 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
925 | #ifdef CONFIG_IPV6_PIMSM_V2 |
926 | case MIFF_REGISTER: | |
927 | /* | |
928 | * Special Purpose VIF in PIM | |
929 | * All the packets will be sent to the daemon | |
930 | */ | |
6bd52143 | 931 | if (mrt->mroute_reg_vif_num >= 0) |
14fb64e1 | 932 | return -EADDRINUSE; |
d1db275d | 933 | dev = ip6mr_reg_vif(net, mrt); |
14fb64e1 YH |
934 | if (!dev) |
935 | return -ENOBUFS; | |
5ae7b444 WC |
936 | err = dev_set_allmulti(dev, 1); |
937 | if (err) { | |
938 | unregister_netdevice(dev); | |
7af3db78 | 939 | dev_put(dev); |
5ae7b444 WC |
940 | return err; |
941 | } | |
14fb64e1 YH |
942 | break; |
943 | #endif | |
7bc570c8 | 944 | case 0: |
8229efda | 945 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
946 | if (!dev) |
947 | return -EADDRNOTAVAIL; | |
5ae7b444 | 948 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
949 | if (err) { |
950 | dev_put(dev); | |
5ae7b444 | 951 | return err; |
7af3db78 | 952 | } |
7bc570c8 YH |
953 | break; |
954 | default: | |
955 | return -EINVAL; | |
956 | } | |
957 | ||
1d6e55f1 TG |
958 | in6_dev = __in6_dev_get(dev); |
959 | if (in6_dev) | |
960 | in6_dev->cnf.mc_forwarding++; | |
961 | ||
7bc570c8 YH |
962 | /* |
963 | * Fill in the VIF structures | |
964 | */ | |
965 | v->rate_limit = vifc->vifc_rate_limit; | |
966 | v->flags = vifc->mif6c_flags; | |
967 | if (!mrtsock) | |
968 | v->flags |= VIFF_STATIC; | |
969 | v->threshold = vifc->vifc_threshold; | |
970 | v->bytes_in = 0; | |
971 | v->bytes_out = 0; | |
972 | v->pkt_in = 0; | |
973 | v->pkt_out = 0; | |
974 | v->link = dev->ifindex; | |
975 | if (v->flags & MIFF_REGISTER) | |
976 | v->link = dev->iflink; | |
977 | ||
978 | /* And finish update writing critical data */ | |
979 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 980 | v->dev = dev; |
14fb64e1 YH |
981 | #ifdef CONFIG_IPV6_PIMSM_V2 |
982 | if (v->flags & MIFF_REGISTER) | |
6bd52143 | 983 | mrt->mroute_reg_vif_num = vifi; |
14fb64e1 | 984 | #endif |
6bd52143 PM |
985 | if (vifi + 1 > mrt->maxvif) |
986 | mrt->maxvif = vifi + 1; | |
7bc570c8 YH |
987 | write_unlock_bh(&mrt_lock); |
988 | return 0; | |
989 | } | |
990 | ||
6bd52143 | 991 | static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt, |
b71d1d42 ED |
992 | const struct in6_addr *origin, |
993 | const struct in6_addr *mcastgrp) | |
7bc570c8 YH |
994 | { |
995 | int line = MFC6_HASH(mcastgrp, origin); | |
996 | struct mfc6_cache *c; | |
997 | ||
6bd52143 | 998 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
999 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
1000 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
f30a7784 | 1001 | return c; |
7bc570c8 | 1002 | } |
f30a7784 | 1003 | return NULL; |
7bc570c8 YH |
1004 | } |
1005 | ||
1006 | /* | |
1007 | * Allocate a multicast cache entry | |
1008 | */ | |
b5aa30b1 | 1009 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
7bc570c8 | 1010 | { |
36cbac59 | 1011 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
1012 | if (c == NULL) |
1013 | return NULL; | |
6ac7eb08 | 1014 | c->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 YH |
1015 | return c; |
1016 | } | |
1017 | ||
b5aa30b1 | 1018 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
7bc570c8 | 1019 | { |
36cbac59 | 1020 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
1021 | if (c == NULL) |
1022 | return NULL; | |
7bc570c8 YH |
1023 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
1024 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
1025 | return c; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * A cache entry has gone into a resolved state from queued | |
1030 | */ | |
1031 | ||
6bd52143 PM |
1032 | static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt, |
1033 | struct mfc6_cache *uc, struct mfc6_cache *c) | |
7bc570c8 YH |
1034 | { |
1035 | struct sk_buff *skb; | |
1036 | ||
1037 | /* | |
1038 | * Play the pending entries through our router | |
1039 | */ | |
1040 | ||
1041 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
1042 | if (ipv6_hdr(skb)->version == 0) { | |
7bc570c8 YH |
1043 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
1044 | ||
5b285cac | 1045 | if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
549e028d | 1046 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
1047 | } else { |
1048 | nlh->nlmsg_type = NLMSG_ERROR; | |
1049 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
1050 | skb_trim(skb, nlh->nlmsg_len); | |
1051 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
1052 | } | |
ddc3731f | 1053 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
7bc570c8 | 1054 | } else |
6bd52143 | 1055 | ip6_mr_forward(net, mrt, skb, c); |
7bc570c8 YH |
1056 | } |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
1061 | * expects the following bizarre scheme. | |
1062 | * | |
1063 | * Called under mrt_lock. | |
1064 | */ | |
1065 | ||
6bd52143 PM |
1066 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, |
1067 | mifi_t mifi, int assert) | |
7bc570c8 YH |
1068 | { |
1069 | struct sk_buff *skb; | |
1070 | struct mrt6msg *msg; | |
1071 | int ret; | |
1072 | ||
14fb64e1 YH |
1073 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1074 | if (assert == MRT6MSG_WHOLEPKT) | |
1075 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
1076 | +sizeof(*msg)); | |
1077 | else | |
1078 | #endif | |
1079 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
1080 | |
1081 | if (!skb) | |
1082 | return -ENOBUFS; | |
1083 | ||
1084 | /* I suppose that internal messages | |
1085 | * do not require checksums */ | |
1086 | ||
1087 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1088 | ||
14fb64e1 YH |
1089 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1090 | if (assert == MRT6MSG_WHOLEPKT) { | |
1091 | /* Ugly, but we have no choice with this interface. | |
1092 | Duplicate old header, fix length etc. | |
1093 | And all this only to mangle msg->im6_msgtype and | |
1094 | to set msg->im6_mbz to "mbz" :-) | |
1095 | */ | |
1096 | skb_push(skb, -skb_network_offset(pkt)); | |
1097 | ||
1098 | skb_push(skb, sizeof(*msg)); | |
1099 | skb_reset_transport_header(skb); | |
1100 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
1101 | msg->im6_mbz = 0; | |
1102 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
6bd52143 | 1103 | msg->im6_mif = mrt->mroute_reg_vif_num; |
14fb64e1 YH |
1104 | msg->im6_pad = 0; |
1105 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
1106 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
1107 | ||
1108 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1109 | } else | |
1110 | #endif | |
1111 | { | |
7bc570c8 YH |
1112 | /* |
1113 | * Copy the IP header | |
1114 | */ | |
1115 | ||
1116 | skb_put(skb, sizeof(struct ipv6hdr)); | |
1117 | skb_reset_network_header(skb); | |
1118 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
1119 | ||
1120 | /* | |
1121 | * Add our header | |
1122 | */ | |
1123 | skb_put(skb, sizeof(*msg)); | |
1124 | skb_reset_transport_header(skb); | |
1125 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
1126 | ||
1127 | msg->im6_mbz = 0; | |
1128 | msg->im6_msgtype = assert; | |
6ac7eb08 | 1129 | msg->im6_mif = mifi; |
7bc570c8 YH |
1130 | msg->im6_pad = 0; |
1131 | ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); | |
1132 | ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); | |
1133 | ||
adf30907 | 1134 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 1135 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 1136 | } |
7bc570c8 | 1137 | |
6bd52143 | 1138 | if (mrt->mroute6_sk == NULL) { |
7bc570c8 YH |
1139 | kfree_skb(skb); |
1140 | return -EINVAL; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Deliver to user space multicast routing algorithms | |
1145 | */ | |
6bd52143 | 1146 | ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb); |
bd91b8bf | 1147 | if (ret < 0) { |
7bc570c8 YH |
1148 | if (net_ratelimit()) |
1149 | printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); | |
1150 | kfree_skb(skb); | |
1151 | } | |
1152 | ||
1153 | return ret; | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Queue a packet for resolution. It gets locked cache entry! | |
1158 | */ | |
1159 | ||
1160 | static int | |
6bd52143 | 1161 | ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 | 1162 | { |
f30a7784 | 1163 | bool found = false; |
7bc570c8 YH |
1164 | int err; |
1165 | struct mfc6_cache *c; | |
1166 | ||
1167 | spin_lock_bh(&mfc_unres_lock); | |
6bd52143 | 1168 | list_for_each_entry(c, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1169 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
f30a7784 PM |
1170 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { |
1171 | found = true; | |
7bc570c8 | 1172 | break; |
f30a7784 | 1173 | } |
7bc570c8 YH |
1174 | } |
1175 | ||
f30a7784 | 1176 | if (!found) { |
7bc570c8 YH |
1177 | /* |
1178 | * Create a new entry if allowable | |
1179 | */ | |
1180 | ||
6bd52143 | 1181 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
b5aa30b1 | 1182 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
7bc570c8 YH |
1183 | spin_unlock_bh(&mfc_unres_lock); |
1184 | ||
1185 | kfree_skb(skb); | |
1186 | return -ENOBUFS; | |
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Fill in the new cache entry | |
1191 | */ | |
1192 | c->mf6c_parent = -1; | |
1193 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
1194 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
1195 | ||
1196 | /* | |
1197 | * Reflect first query at pim6sd | |
1198 | */ | |
6bd52143 | 1199 | err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); |
8229efda | 1200 | if (err < 0) { |
7bc570c8 YH |
1201 | /* If the report failed throw the cache entry |
1202 | out - Brad Parker | |
1203 | */ | |
1204 | spin_unlock_bh(&mfc_unres_lock); | |
1205 | ||
58701ad4 | 1206 | ip6mr_cache_free(c); |
7bc570c8 YH |
1207 | kfree_skb(skb); |
1208 | return err; | |
1209 | } | |
1210 | ||
6bd52143 PM |
1211 | atomic_inc(&mrt->cache_resolve_queue_len); |
1212 | list_add(&c->list, &mrt->mfc6_unres_queue); | |
7bc570c8 | 1213 | |
6bd52143 | 1214 | ipmr_do_expire_process(mrt); |
7bc570c8 YH |
1215 | } |
1216 | ||
1217 | /* | |
1218 | * See if we can append the packet | |
1219 | */ | |
1220 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1221 | kfree_skb(skb); | |
1222 | err = -ENOBUFS; | |
1223 | } else { | |
1224 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
1225 | err = 0; | |
1226 | } | |
1227 | ||
1228 | spin_unlock_bh(&mfc_unres_lock); | |
1229 | return err; | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * MFC6 cache manipulation by user space | |
1234 | */ | |
1235 | ||
6bd52143 | 1236 | static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc) |
7bc570c8 YH |
1237 | { |
1238 | int line; | |
f30a7784 | 1239 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1240 | |
1241 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1242 | ||
6bd52143 | 1243 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
1244 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
1245 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
1246 | write_lock_bh(&mrt_lock); | |
f30a7784 | 1247 | list_del(&c->list); |
7bc570c8 YH |
1248 | write_unlock_bh(&mrt_lock); |
1249 | ||
58701ad4 | 1250 | ip6mr_cache_free(c); |
7bc570c8 YH |
1251 | return 0; |
1252 | } | |
1253 | } | |
1254 | return -ENOENT; | |
1255 | } | |
1256 | ||
1257 | static int ip6mr_device_event(struct notifier_block *this, | |
1258 | unsigned long event, void *ptr) | |
1259 | { | |
1260 | struct net_device *dev = ptr; | |
8229efda | 1261 | struct net *net = dev_net(dev); |
d1db275d | 1262 | struct mr6_table *mrt; |
7bc570c8 YH |
1263 | struct mif_device *v; |
1264 | int ct; | |
c871e664 | 1265 | LIST_HEAD(list); |
7bc570c8 | 1266 | |
7bc570c8 YH |
1267 | if (event != NETDEV_UNREGISTER) |
1268 | return NOTIFY_DONE; | |
1269 | ||
d1db275d PM |
1270 | ip6mr_for_each_table(mrt, net) { |
1271 | v = &mrt->vif6_table[0]; | |
1272 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1273 | if (v->dev == dev) | |
1274 | mif6_delete(mrt, ct, &list); | |
1275 | } | |
7bc570c8 | 1276 | } |
c871e664 ED |
1277 | unregister_netdevice_many(&list); |
1278 | ||
7bc570c8 YH |
1279 | return NOTIFY_DONE; |
1280 | } | |
1281 | ||
1282 | static struct notifier_block ip6_mr_notifier = { | |
1283 | .notifier_call = ip6mr_device_event | |
1284 | }; | |
1285 | ||
1286 | /* | |
1287 | * Setup for IP multicast routing | |
1288 | */ | |
1289 | ||
4e16880c BT |
1290 | static int __net_init ip6mr_net_init(struct net *net) |
1291 | { | |
d1db275d | 1292 | int err; |
f30a7784 | 1293 | |
d1db275d PM |
1294 | err = ip6mr_rules_init(net); |
1295 | if (err < 0) | |
4e16880c | 1296 | goto fail; |
8b90fc7e BT |
1297 | |
1298 | #ifdef CONFIG_PROC_FS | |
1299 | err = -ENOMEM; | |
1300 | if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
1301 | goto proc_vif_fail; | |
1302 | if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) | |
1303 | goto proc_cache_fail; | |
1304 | #endif | |
6bd52143 | 1305 | |
4a6258a0 BT |
1306 | return 0; |
1307 | ||
8b90fc7e BT |
1308 | #ifdef CONFIG_PROC_FS |
1309 | proc_cache_fail: | |
1310 | proc_net_remove(net, "ip6_mr_vif"); | |
1311 | proc_vif_fail: | |
d1db275d | 1312 | ip6mr_rules_exit(net); |
8b90fc7e | 1313 | #endif |
4e16880c BT |
1314 | fail: |
1315 | return err; | |
1316 | } | |
1317 | ||
1318 | static void __net_exit ip6mr_net_exit(struct net *net) | |
1319 | { | |
8b90fc7e BT |
1320 | #ifdef CONFIG_PROC_FS |
1321 | proc_net_remove(net, "ip6_mr_cache"); | |
1322 | proc_net_remove(net, "ip6_mr_vif"); | |
1323 | #endif | |
d1db275d | 1324 | ip6mr_rules_exit(net); |
4e16880c BT |
1325 | } |
1326 | ||
1327 | static struct pernet_operations ip6mr_net_ops = { | |
1328 | .init = ip6mr_net_init, | |
1329 | .exit = ip6mr_net_exit, | |
1330 | }; | |
1331 | ||
623d1a1a | 1332 | int __init ip6_mr_init(void) |
7bc570c8 | 1333 | { |
623d1a1a WC |
1334 | int err; |
1335 | ||
7bc570c8 YH |
1336 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
1337 | sizeof(struct mfc6_cache), | |
1338 | 0, SLAB_HWCACHE_ALIGN, | |
1339 | NULL); | |
1340 | if (!mrt_cachep) | |
623d1a1a | 1341 | return -ENOMEM; |
7bc570c8 | 1342 | |
4e16880c BT |
1343 | err = register_pernet_subsys(&ip6mr_net_ops); |
1344 | if (err) | |
1345 | goto reg_pernet_fail; | |
1346 | ||
623d1a1a WC |
1347 | err = register_netdevice_notifier(&ip6_mr_notifier); |
1348 | if (err) | |
1349 | goto reg_notif_fail; | |
403dbb97 TG |
1350 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1351 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { | |
1352 | printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n"); | |
1353 | err = -EAGAIN; | |
1354 | goto add_proto_fail; | |
1355 | } | |
1356 | #endif | |
c7ac8679 GR |
1357 | rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL, |
1358 | ip6mr_rtm_dumproute, NULL); | |
623d1a1a | 1359 | return 0; |
403dbb97 TG |
1360 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1361 | add_proto_fail: | |
1362 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1363 | #endif | |
87b30a65 | 1364 | reg_notif_fail: |
4e16880c BT |
1365 | unregister_pernet_subsys(&ip6mr_net_ops); |
1366 | reg_pernet_fail: | |
87b30a65 | 1367 | kmem_cache_destroy(mrt_cachep); |
623d1a1a | 1368 | return err; |
7bc570c8 YH |
1369 | } |
1370 | ||
623d1a1a WC |
1371 | void ip6_mr_cleanup(void) |
1372 | { | |
623d1a1a | 1373 | unregister_netdevice_notifier(&ip6_mr_notifier); |
4e16880c | 1374 | unregister_pernet_subsys(&ip6mr_net_ops); |
623d1a1a WC |
1375 | kmem_cache_destroy(mrt_cachep); |
1376 | } | |
7bc570c8 | 1377 | |
6bd52143 PM |
1378 | static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, |
1379 | struct mf6cctl *mfc, int mrtsock) | |
7bc570c8 | 1380 | { |
f30a7784 | 1381 | bool found = false; |
7bc570c8 | 1382 | int line; |
f30a7784 | 1383 | struct mfc6_cache *uc, *c; |
6ac7eb08 | 1384 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1385 | int i; |
1386 | ||
a50436f2 PM |
1387 | if (mfc->mf6cc_parent >= MAXMIFS) |
1388 | return -ENFILE; | |
1389 | ||
6ac7eb08 RR |
1390 | memset(ttls, 255, MAXMIFS); |
1391 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1392 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1393 | ttls[i] = 1; | |
1394 | ||
1395 | } | |
1396 | ||
1397 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1398 | ||
6bd52143 | 1399 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 | 1400 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
f30a7784 PM |
1401 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { |
1402 | found = true; | |
7bc570c8 | 1403 | break; |
f30a7784 | 1404 | } |
7bc570c8 YH |
1405 | } |
1406 | ||
f30a7784 | 1407 | if (found) { |
7bc570c8 YH |
1408 | write_lock_bh(&mrt_lock); |
1409 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1410 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1411 | if (!mrtsock) |
1412 | c->mfc_flags |= MFC_STATIC; | |
1413 | write_unlock_bh(&mrt_lock); | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1418 | return -EINVAL; | |
1419 | ||
b5aa30b1 | 1420 | c = ip6mr_cache_alloc(); |
7bc570c8 YH |
1421 | if (c == NULL) |
1422 | return -ENOMEM; | |
1423 | ||
1424 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1425 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1426 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1427 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1428 | if (!mrtsock) |
1429 | c->mfc_flags |= MFC_STATIC; | |
1430 | ||
1431 | write_lock_bh(&mrt_lock); | |
6bd52143 | 1432 | list_add(&c->list, &mrt->mfc6_cache_array[line]); |
7bc570c8 YH |
1433 | write_unlock_bh(&mrt_lock); |
1434 | ||
1435 | /* | |
1436 | * Check to see if we resolved a queued list. If so we | |
1437 | * need to send on the frames and tidy up. | |
1438 | */ | |
f30a7784 | 1439 | found = false; |
7bc570c8 | 1440 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1441 | list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1442 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 | 1443 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
f30a7784 | 1444 | list_del(&uc->list); |
6bd52143 | 1445 | atomic_dec(&mrt->cache_resolve_queue_len); |
f30a7784 | 1446 | found = true; |
7bc570c8 YH |
1447 | break; |
1448 | } | |
1449 | } | |
6bd52143 PM |
1450 | if (list_empty(&mrt->mfc6_unres_queue)) |
1451 | del_timer(&mrt->ipmr_expire_timer); | |
7bc570c8 YH |
1452 | spin_unlock_bh(&mfc_unres_lock); |
1453 | ||
f30a7784 | 1454 | if (found) { |
6bd52143 | 1455 | ip6mr_cache_resolve(net, mrt, uc, c); |
58701ad4 | 1456 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1457 | } |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Close the multicast socket, and clear the vif tables etc | |
1463 | */ | |
1464 | ||
6bd52143 | 1465 | static void mroute_clean_tables(struct mr6_table *mrt) |
7bc570c8 YH |
1466 | { |
1467 | int i; | |
c871e664 | 1468 | LIST_HEAD(list); |
f30a7784 | 1469 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1470 | |
1471 | /* | |
1472 | * Shut down all active vif entries | |
1473 | */ | |
6bd52143 PM |
1474 | for (i = 0; i < mrt->maxvif; i++) { |
1475 | if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) | |
1476 | mif6_delete(mrt, i, &list); | |
7bc570c8 | 1477 | } |
c871e664 | 1478 | unregister_netdevice_many(&list); |
7bc570c8 YH |
1479 | |
1480 | /* | |
1481 | * Wipe the cache | |
1482 | */ | |
4a6258a0 | 1483 | for (i = 0; i < MFC6_LINES; i++) { |
6bd52143 | 1484 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { |
f30a7784 | 1485 | if (c->mfc_flags & MFC_STATIC) |
7bc570c8 | 1486 | continue; |
7bc570c8 | 1487 | write_lock_bh(&mrt_lock); |
f30a7784 | 1488 | list_del(&c->list); |
7bc570c8 YH |
1489 | write_unlock_bh(&mrt_lock); |
1490 | ||
58701ad4 | 1491 | ip6mr_cache_free(c); |
7bc570c8 YH |
1492 | } |
1493 | } | |
1494 | ||
6bd52143 | 1495 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
7bc570c8 | 1496 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1497 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
f30a7784 | 1498 | list_del(&c->list); |
6bd52143 | 1499 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
1500 | } |
1501 | spin_unlock_bh(&mfc_unres_lock); | |
1502 | } | |
1503 | } | |
1504 | ||
6bd52143 | 1505 | static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk) |
7bc570c8 YH |
1506 | { |
1507 | int err = 0; | |
8229efda | 1508 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1509 | |
1510 | rtnl_lock(); | |
1511 | write_lock_bh(&mrt_lock); | |
6bd52143 PM |
1512 | if (likely(mrt->mroute6_sk == NULL)) { |
1513 | mrt->mroute6_sk = sk; | |
1d6e55f1 TG |
1514 | net->ipv6.devconf_all->mc_forwarding++; |
1515 | } | |
7bc570c8 YH |
1516 | else |
1517 | err = -EADDRINUSE; | |
1518 | write_unlock_bh(&mrt_lock); | |
1519 | ||
1520 | rtnl_unlock(); | |
1521 | ||
1522 | return err; | |
1523 | } | |
1524 | ||
1525 | int ip6mr_sk_done(struct sock *sk) | |
1526 | { | |
d1db275d | 1527 | int err = -EACCES; |
8229efda | 1528 | struct net *net = sock_net(sk); |
d1db275d | 1529 | struct mr6_table *mrt; |
7bc570c8 YH |
1530 | |
1531 | rtnl_lock(); | |
d1db275d PM |
1532 | ip6mr_for_each_table(mrt, net) { |
1533 | if (sk == mrt->mroute6_sk) { | |
1534 | write_lock_bh(&mrt_lock); | |
1535 | mrt->mroute6_sk = NULL; | |
1536 | net->ipv6.devconf_all->mc_forwarding--; | |
1537 | write_unlock_bh(&mrt_lock); | |
7bc570c8 | 1538 | |
d1db275d PM |
1539 | mroute_clean_tables(mrt); |
1540 | err = 0; | |
1541 | break; | |
1542 | } | |
1543 | } | |
7bc570c8 YH |
1544 | rtnl_unlock(); |
1545 | ||
1546 | return err; | |
1547 | } | |
1548 | ||
d1db275d | 1549 | struct sock *mroute6_socket(struct net *net, struct sk_buff *skb) |
6bd52143 | 1550 | { |
d1db275d | 1551 | struct mr6_table *mrt; |
4c9483b2 DM |
1552 | struct flowi6 fl6 = { |
1553 | .flowi6_iif = skb->skb_iif, | |
1554 | .flowi6_oif = skb->dev->ifindex, | |
1555 | .flowi6_mark = skb->mark, | |
d1db275d PM |
1556 | }; |
1557 | ||
4c9483b2 | 1558 | if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
d1db275d | 1559 | return NULL; |
6bd52143 PM |
1560 | |
1561 | return mrt->mroute6_sk; | |
1562 | } | |
1563 | ||
7bc570c8 YH |
1564 | /* |
1565 | * Socket options and virtual interface manipulation. The whole | |
1566 | * virtual interface system is a complete heap, but unfortunately | |
1567 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1568 | * MOSPF/PIM router set up we can clean this up. | |
1569 | */ | |
1570 | ||
b7058842 | 1571 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
7bc570c8 YH |
1572 | { |
1573 | int ret; | |
1574 | struct mif6ctl vif; | |
1575 | struct mf6cctl mfc; | |
1576 | mifi_t mifi; | |
8229efda | 1577 | struct net *net = sock_net(sk); |
d1db275d PM |
1578 | struct mr6_table *mrt; |
1579 | ||
1580 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1581 | if (mrt == NULL) | |
1582 | return -ENOENT; | |
7bc570c8 YH |
1583 | |
1584 | if (optname != MRT6_INIT) { | |
6bd52143 | 1585 | if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN)) |
7bc570c8 YH |
1586 | return -EACCES; |
1587 | } | |
1588 | ||
1589 | switch (optname) { | |
1590 | case MRT6_INIT: | |
1591 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1592 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
7bc570c8 YH |
1593 | return -EOPNOTSUPP; |
1594 | if (optlen < sizeof(int)) | |
1595 | return -EINVAL; | |
1596 | ||
6bd52143 | 1597 | return ip6mr_sk_init(mrt, sk); |
7bc570c8 YH |
1598 | |
1599 | case MRT6_DONE: | |
1600 | return ip6mr_sk_done(sk); | |
1601 | ||
1602 | case MRT6_ADD_MIF: | |
1603 | if (optlen < sizeof(vif)) | |
1604 | return -EINVAL; | |
1605 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1606 | return -EFAULT; | |
6ac7eb08 | 1607 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1608 | return -ENFILE; |
1609 | rtnl_lock(); | |
6bd52143 | 1610 | ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1611 | rtnl_unlock(); |
1612 | return ret; | |
1613 | ||
1614 | case MRT6_DEL_MIF: | |
1615 | if (optlen < sizeof(mifi_t)) | |
1616 | return -EINVAL; | |
1617 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1618 | return -EFAULT; | |
1619 | rtnl_lock(); | |
6bd52143 | 1620 | ret = mif6_delete(mrt, mifi, NULL); |
7bc570c8 YH |
1621 | rtnl_unlock(); |
1622 | return ret; | |
1623 | ||
1624 | /* | |
1625 | * Manipulate the forwarding caches. These live | |
1626 | * in a sort of kernel/user symbiosis. | |
1627 | */ | |
1628 | case MRT6_ADD_MFC: | |
1629 | case MRT6_DEL_MFC: | |
1630 | if (optlen < sizeof(mfc)) | |
1631 | return -EINVAL; | |
1632 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1633 | return -EFAULT; | |
1634 | rtnl_lock(); | |
1635 | if (optname == MRT6_DEL_MFC) | |
6bd52143 | 1636 | ret = ip6mr_mfc_delete(mrt, &mfc); |
7bc570c8 | 1637 | else |
6bd52143 | 1638 | ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1639 | rtnl_unlock(); |
1640 | return ret; | |
1641 | ||
14fb64e1 YH |
1642 | /* |
1643 | * Control PIM assert (to activate pim will activate assert) | |
1644 | */ | |
1645 | case MRT6_ASSERT: | |
1646 | { | |
1647 | int v; | |
1648 | if (get_user(v, (int __user *)optval)) | |
1649 | return -EFAULT; | |
6bd52143 | 1650 | mrt->mroute_do_assert = !!v; |
14fb64e1 YH |
1651 | return 0; |
1652 | } | |
1653 | ||
1654 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1655 | case MRT6_PIM: | |
1656 | { | |
a9f83bf3 | 1657 | int v; |
14fb64e1 YH |
1658 | if (get_user(v, (int __user *)optval)) |
1659 | return -EFAULT; | |
1660 | v = !!v; | |
1661 | rtnl_lock(); | |
1662 | ret = 0; | |
6bd52143 PM |
1663 | if (v != mrt->mroute_do_pim) { |
1664 | mrt->mroute_do_pim = v; | |
1665 | mrt->mroute_do_assert = v; | |
14fb64e1 YH |
1666 | } |
1667 | rtnl_unlock(); | |
1668 | return ret; | |
1669 | } | |
1670 | ||
d1db275d PM |
1671 | #endif |
1672 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
1673 | case MRT6_TABLE: | |
1674 | { | |
1675 | u32 v; | |
1676 | ||
1677 | if (optlen != sizeof(u32)) | |
1678 | return -EINVAL; | |
1679 | if (get_user(v, (u32 __user *)optval)) | |
1680 | return -EFAULT; | |
1681 | if (sk == mrt->mroute6_sk) | |
1682 | return -EBUSY; | |
1683 | ||
1684 | rtnl_lock(); | |
1685 | ret = 0; | |
1686 | if (!ip6mr_new_table(net, v)) | |
1687 | ret = -ENOMEM; | |
1688 | raw6_sk(sk)->ip6mr_table = v; | |
1689 | rtnl_unlock(); | |
1690 | return ret; | |
1691 | } | |
14fb64e1 | 1692 | #endif |
7bc570c8 | 1693 | /* |
7d120c55 | 1694 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1695 | * set. |
1696 | */ | |
1697 | default: | |
1698 | return -ENOPROTOOPT; | |
1699 | } | |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * Getsock opt support for the multicast routing system. | |
1704 | */ | |
1705 | ||
1706 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1707 | int __user *optlen) | |
1708 | { | |
1709 | int olr; | |
1710 | int val; | |
8229efda | 1711 | struct net *net = sock_net(sk); |
d1db275d PM |
1712 | struct mr6_table *mrt; |
1713 | ||
1714 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1715 | if (mrt == NULL) | |
1716 | return -ENOENT; | |
7bc570c8 YH |
1717 | |
1718 | switch (optname) { | |
1719 | case MRT6_VERSION: | |
1720 | val = 0x0305; | |
1721 | break; | |
14fb64e1 YH |
1722 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1723 | case MRT6_PIM: | |
6bd52143 | 1724 | val = mrt->mroute_do_pim; |
14fb64e1 YH |
1725 | break; |
1726 | #endif | |
1727 | case MRT6_ASSERT: | |
6bd52143 | 1728 | val = mrt->mroute_do_assert; |
14fb64e1 | 1729 | break; |
7bc570c8 YH |
1730 | default: |
1731 | return -ENOPROTOOPT; | |
1732 | } | |
1733 | ||
1734 | if (get_user(olr, optlen)) | |
1735 | return -EFAULT; | |
1736 | ||
1737 | olr = min_t(int, olr, sizeof(int)); | |
1738 | if (olr < 0) | |
1739 | return -EINVAL; | |
1740 | ||
1741 | if (put_user(olr, optlen)) | |
1742 | return -EFAULT; | |
1743 | if (copy_to_user(optval, &val, olr)) | |
1744 | return -EFAULT; | |
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | /* | |
1749 | * The IP multicast ioctl support routines. | |
1750 | */ | |
1751 | ||
1752 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1753 | { | |
1754 | struct sioc_sg_req6 sr; | |
1755 | struct sioc_mif_req6 vr; | |
1756 | struct mif_device *vif; | |
1757 | struct mfc6_cache *c; | |
8229efda | 1758 | struct net *net = sock_net(sk); |
d1db275d PM |
1759 | struct mr6_table *mrt; |
1760 | ||
1761 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1762 | if (mrt == NULL) | |
1763 | return -ENOENT; | |
7bc570c8 YH |
1764 | |
1765 | switch (cmd) { | |
1766 | case SIOCGETMIFCNT_IN6: | |
1767 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1768 | return -EFAULT; | |
6bd52143 | 1769 | if (vr.mifi >= mrt->maxvif) |
7bc570c8 YH |
1770 | return -EINVAL; |
1771 | read_lock(&mrt_lock); | |
6bd52143 PM |
1772 | vif = &mrt->vif6_table[vr.mifi]; |
1773 | if (MIF_EXISTS(mrt, vr.mifi)) { | |
7bc570c8 YH |
1774 | vr.icount = vif->pkt_in; |
1775 | vr.ocount = vif->pkt_out; | |
1776 | vr.ibytes = vif->bytes_in; | |
1777 | vr.obytes = vif->bytes_out; | |
1778 | read_unlock(&mrt_lock); | |
1779 | ||
1780 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1781 | return -EFAULT; | |
1782 | return 0; | |
1783 | } | |
1784 | read_unlock(&mrt_lock); | |
1785 | return -EADDRNOTAVAIL; | |
1786 | case SIOCGETSGCNT_IN6: | |
1787 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1788 | return -EFAULT; | |
1789 | ||
1790 | read_lock(&mrt_lock); | |
6bd52143 | 1791 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1792 | if (c) { |
1793 | sr.pktcnt = c->mfc_un.res.pkt; | |
1794 | sr.bytecnt = c->mfc_un.res.bytes; | |
1795 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1796 | read_unlock(&mrt_lock); | |
1797 | ||
1798 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1799 | return -EFAULT; | |
1800 | return 0; | |
1801 | } | |
1802 | read_unlock(&mrt_lock); | |
1803 | return -EADDRNOTAVAIL; | |
1804 | default: | |
1805 | return -ENOIOCTLCMD; | |
1806 | } | |
1807 | } | |
1808 | ||
e2d57766 DM |
1809 | #ifdef CONFIG_COMPAT |
1810 | struct compat_sioc_sg_req6 { | |
1811 | struct sockaddr_in6 src; | |
1812 | struct sockaddr_in6 grp; | |
1813 | compat_ulong_t pktcnt; | |
1814 | compat_ulong_t bytecnt; | |
1815 | compat_ulong_t wrong_if; | |
1816 | }; | |
1817 | ||
1818 | struct compat_sioc_mif_req6 { | |
1819 | mifi_t mifi; | |
1820 | compat_ulong_t icount; | |
1821 | compat_ulong_t ocount; | |
1822 | compat_ulong_t ibytes; | |
1823 | compat_ulong_t obytes; | |
1824 | }; | |
1825 | ||
1826 | int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) | |
1827 | { | |
1828 | struct compat_sioc_sg_req6 sr; | |
1829 | struct compat_sioc_mif_req6 vr; | |
1830 | struct mif_device *vif; | |
1831 | struct mfc6_cache *c; | |
1832 | struct net *net = sock_net(sk); | |
1833 | struct mr6_table *mrt; | |
1834 | ||
1835 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1836 | if (mrt == NULL) | |
1837 | return -ENOENT; | |
1838 | ||
1839 | switch (cmd) { | |
1840 | case SIOCGETMIFCNT_IN6: | |
1841 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1842 | return -EFAULT; | |
1843 | if (vr.mifi >= mrt->maxvif) | |
1844 | return -EINVAL; | |
1845 | read_lock(&mrt_lock); | |
1846 | vif = &mrt->vif6_table[vr.mifi]; | |
1847 | if (MIF_EXISTS(mrt, vr.mifi)) { | |
1848 | vr.icount = vif->pkt_in; | |
1849 | vr.ocount = vif->pkt_out; | |
1850 | vr.ibytes = vif->bytes_in; | |
1851 | vr.obytes = vif->bytes_out; | |
1852 | read_unlock(&mrt_lock); | |
1853 | ||
1854 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1855 | return -EFAULT; | |
1856 | return 0; | |
1857 | } | |
1858 | read_unlock(&mrt_lock); | |
1859 | return -EADDRNOTAVAIL; | |
1860 | case SIOCGETSGCNT_IN6: | |
1861 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1862 | return -EFAULT; | |
1863 | ||
1864 | read_lock(&mrt_lock); | |
1865 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); | |
1866 | if (c) { | |
1867 | sr.pktcnt = c->mfc_un.res.pkt; | |
1868 | sr.bytecnt = c->mfc_un.res.bytes; | |
1869 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1870 | read_unlock(&mrt_lock); | |
1871 | ||
1872 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1873 | return -EFAULT; | |
1874 | return 0; | |
1875 | } | |
1876 | read_unlock(&mrt_lock); | |
1877 | return -EADDRNOTAVAIL; | |
1878 | default: | |
1879 | return -ENOIOCTLCMD; | |
1880 | } | |
1881 | } | |
1882 | #endif | |
7bc570c8 YH |
1883 | |
1884 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1885 | { | |
adf30907 | 1886 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1887 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
7bc570c8 YH |
1888 | return dst_output(skb); |
1889 | } | |
1890 | ||
1891 | /* | |
1892 | * Processing handlers for ip6mr_forward | |
1893 | */ | |
1894 | ||
6bd52143 PM |
1895 | static int ip6mr_forward2(struct net *net, struct mr6_table *mrt, |
1896 | struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
7bc570c8 YH |
1897 | { |
1898 | struct ipv6hdr *ipv6h; | |
6bd52143 | 1899 | struct mif_device *vif = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
1900 | struct net_device *dev; |
1901 | struct dst_entry *dst; | |
4c9483b2 | 1902 | struct flowi6 fl6; |
7bc570c8 YH |
1903 | |
1904 | if (vif->dev == NULL) | |
1905 | goto out_free; | |
1906 | ||
14fb64e1 YH |
1907 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1908 | if (vif->flags & MIFF_REGISTER) { | |
1909 | vif->pkt_out++; | |
1910 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1911 | vif->dev->stats.tx_bytes += skb->len; |
1912 | vif->dev->stats.tx_packets++; | |
6bd52143 | 1913 | ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1914 | goto out_free; |
14fb64e1 YH |
1915 | } |
1916 | #endif | |
1917 | ||
7bc570c8 YH |
1918 | ipv6h = ipv6_hdr(skb); |
1919 | ||
4c9483b2 DM |
1920 | fl6 = (struct flowi6) { |
1921 | .flowi6_oif = vif->link, | |
1922 | .daddr = ipv6h->daddr, | |
7bc570c8 YH |
1923 | }; |
1924 | ||
4c9483b2 | 1925 | dst = ip6_route_output(net, NULL, &fl6); |
7bc570c8 YH |
1926 | if (!dst) |
1927 | goto out_free; | |
1928 | ||
adf30907 ED |
1929 | skb_dst_drop(skb); |
1930 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1931 | |
1932 | /* | |
1933 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1934 | * not only before forwarding, but after forwarding on all output | |
1935 | * interfaces. It is clear, if mrouter runs a multicasting | |
1936 | * program, it should receive packets not depending to what interface | |
1937 | * program is joined. | |
1938 | * If we will not make it, the program will have to join on all | |
1939 | * interfaces. On the other hand, multihoming host (or router, but | |
1940 | * not mrouter) cannot join to more than one interface - it will | |
1941 | * result in receiving multiple packets. | |
1942 | */ | |
1943 | dev = vif->dev; | |
1944 | skb->dev = dev; | |
1945 | vif->pkt_out++; | |
1946 | vif->bytes_out += skb->len; | |
1947 | ||
1948 | /* We are about to write */ | |
1949 | /* XXX: extension headers? */ | |
1950 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1951 | goto out_free; | |
1952 | ||
1953 | ipv6h = ipv6_hdr(skb); | |
1954 | ipv6h->hop_limit--; | |
1955 | ||
1956 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1957 | ||
b2e0b385 | 1958 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, |
7bc570c8 YH |
1959 | ip6mr_forward2_finish); |
1960 | ||
1961 | out_free: | |
1962 | kfree_skb(skb); | |
1963 | return 0; | |
1964 | } | |
1965 | ||
6bd52143 | 1966 | static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev) |
7bc570c8 YH |
1967 | { |
1968 | int ct; | |
6bd52143 PM |
1969 | |
1970 | for (ct = mrt->maxvif - 1; ct >= 0; ct--) { | |
1971 | if (mrt->vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1972 | break; |
1973 | } | |
1974 | return ct; | |
1975 | } | |
1976 | ||
6bd52143 PM |
1977 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
1978 | struct sk_buff *skb, struct mfc6_cache *cache) | |
7bc570c8 YH |
1979 | { |
1980 | int psend = -1; | |
1981 | int vif, ct; | |
1982 | ||
1983 | vif = cache->mf6c_parent; | |
1984 | cache->mfc_un.res.pkt++; | |
1985 | cache->mfc_un.res.bytes += skb->len; | |
1986 | ||
14fb64e1 YH |
1987 | /* |
1988 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1989 | */ | |
6bd52143 | 1990 | if (mrt->vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
1991 | int true_vifi; |
1992 | ||
1993 | cache->mfc_un.res.wrong_if++; | |
6bd52143 | 1994 | true_vifi = ip6mr_find_vif(mrt, skb->dev); |
14fb64e1 | 1995 | |
6bd52143 | 1996 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
14fb64e1 YH |
1997 | /* pimsm uses asserts, when switching from RPT to SPT, |
1998 | so that we cannot check that packet arrived on an oif. | |
1999 | It is bad, but otherwise we would need to move pretty | |
2000 | large chunk of pimd to kernel. Ough... --ANK | |
2001 | */ | |
6bd52143 | 2002 | (mrt->mroute_do_pim || |
a21f3f99 | 2003 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
2004 | time_after(jiffies, |
2005 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
2006 | cache->mfc_un.res.last_assert = jiffies; | |
6bd52143 | 2007 | ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
2008 | } |
2009 | goto dont_forward; | |
2010 | } | |
2011 | ||
6bd52143 PM |
2012 | mrt->vif6_table[vif].pkt_in++; |
2013 | mrt->vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
2014 | |
2015 | /* | |
2016 | * Forward the frame | |
2017 | */ | |
2018 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
2019 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
2020 | if (psend != -1) { | |
2021 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2022 | if (skb2) | |
6bd52143 | 2023 | ip6mr_forward2(net, mrt, skb2, cache, psend); |
7bc570c8 YH |
2024 | } |
2025 | psend = ct; | |
2026 | } | |
2027 | } | |
2028 | if (psend != -1) { | |
6bd52143 | 2029 | ip6mr_forward2(net, mrt, skb, cache, psend); |
7bc570c8 YH |
2030 | return 0; |
2031 | } | |
2032 | ||
14fb64e1 | 2033 | dont_forward: |
7bc570c8 YH |
2034 | kfree_skb(skb); |
2035 | return 0; | |
2036 | } | |
2037 | ||
2038 | ||
2039 | /* | |
2040 | * Multicast packets for forwarding arrive here | |
2041 | */ | |
2042 | ||
2043 | int ip6_mr_input(struct sk_buff *skb) | |
2044 | { | |
2045 | struct mfc6_cache *cache; | |
8229efda | 2046 | struct net *net = dev_net(skb->dev); |
d1db275d | 2047 | struct mr6_table *mrt; |
4c9483b2 DM |
2048 | struct flowi6 fl6 = { |
2049 | .flowi6_iif = skb->dev->ifindex, | |
2050 | .flowi6_mark = skb->mark, | |
d1db275d PM |
2051 | }; |
2052 | int err; | |
2053 | ||
4c9483b2 | 2054 | err = ip6mr_fib_lookup(net, &fl6, &mrt); |
d1db275d PM |
2055 | if (err < 0) |
2056 | return err; | |
7bc570c8 YH |
2057 | |
2058 | read_lock(&mrt_lock); | |
6bd52143 | 2059 | cache = ip6mr_cache_find(mrt, |
8229efda | 2060 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
7bc570c8 YH |
2061 | |
2062 | /* | |
2063 | * No usable cache entry | |
2064 | */ | |
2065 | if (cache == NULL) { | |
2066 | int vif; | |
2067 | ||
6bd52143 | 2068 | vif = ip6mr_find_vif(mrt, skb->dev); |
7bc570c8 | 2069 | if (vif >= 0) { |
6bd52143 | 2070 | int err = ip6mr_cache_unresolved(mrt, vif, skb); |
7bc570c8 YH |
2071 | read_unlock(&mrt_lock); |
2072 | ||
2073 | return err; | |
2074 | } | |
2075 | read_unlock(&mrt_lock); | |
2076 | kfree_skb(skb); | |
2077 | return -ENODEV; | |
2078 | } | |
2079 | ||
6bd52143 | 2080 | ip6_mr_forward(net, mrt, skb, cache); |
7bc570c8 YH |
2081 | |
2082 | read_unlock(&mrt_lock); | |
2083 | ||
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | ||
5b285cac PM |
2088 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
2089 | struct mfc6_cache *c, struct rtmsg *rtm) | |
7bc570c8 YH |
2090 | { |
2091 | int ct; | |
2092 | struct rtnexthop *nhp; | |
549e028d | 2093 | u8 *b = skb_tail_pointer(skb); |
7bc570c8 YH |
2094 | struct rtattr *mp_head; |
2095 | ||
7438189b | 2096 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2097 | if (c->mf6c_parent >= MAXMIFS) |
7438189b ND |
2098 | return -ENOENT; |
2099 | ||
6bd52143 PM |
2100 | if (MIF_EXISTS(mrt, c->mf6c_parent)) |
2101 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif6_table[c->mf6c_parent].dev->ifindex); | |
7bc570c8 YH |
2102 | |
2103 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); | |
2104 | ||
2105 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
6bd52143 | 2106 | if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
7bc570c8 YH |
2107 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
2108 | goto rtattr_failure; | |
2109 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); | |
2110 | nhp->rtnh_flags = 0; | |
2111 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
6bd52143 | 2112 | nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
2113 | nhp->rtnh_len = sizeof(*nhp); |
2114 | } | |
2115 | } | |
2116 | mp_head->rta_type = RTA_MULTIPATH; | |
549e028d | 2117 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
7bc570c8 YH |
2118 | rtm->rtm_type = RTN_MULTICAST; |
2119 | return 1; | |
2120 | ||
2121 | rtattr_failure: | |
2122 | nlmsg_trim(skb, b); | |
2123 | return -EMSGSIZE; | |
2124 | } | |
2125 | ||
8229efda BT |
2126 | int ip6mr_get_route(struct net *net, |
2127 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
2128 | { |
2129 | int err; | |
d1db275d | 2130 | struct mr6_table *mrt; |
7bc570c8 | 2131 | struct mfc6_cache *cache; |
adf30907 | 2132 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 | 2133 | |
d1db275d PM |
2134 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
2135 | if (mrt == NULL) | |
2136 | return -ENOENT; | |
2137 | ||
7bc570c8 | 2138 | read_lock(&mrt_lock); |
6bd52143 | 2139 | cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
2140 | |
2141 | if (!cache) { | |
2142 | struct sk_buff *skb2; | |
2143 | struct ipv6hdr *iph; | |
2144 | struct net_device *dev; | |
2145 | int vif; | |
2146 | ||
2147 | if (nowait) { | |
2148 | read_unlock(&mrt_lock); | |
2149 | return -EAGAIN; | |
2150 | } | |
2151 | ||
2152 | dev = skb->dev; | |
6bd52143 | 2153 | if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) { |
7bc570c8 YH |
2154 | read_unlock(&mrt_lock); |
2155 | return -ENODEV; | |
2156 | } | |
2157 | ||
2158 | /* really correct? */ | |
2159 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
2160 | if (!skb2) { | |
2161 | read_unlock(&mrt_lock); | |
2162 | return -ENOMEM; | |
2163 | } | |
2164 | ||
2165 | skb_reset_transport_header(skb2); | |
2166 | ||
2167 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
2168 | skb_reset_network_header(skb2); | |
2169 | ||
2170 | iph = ipv6_hdr(skb2); | |
2171 | iph->version = 0; | |
2172 | iph->priority = 0; | |
2173 | iph->flow_lbl[0] = 0; | |
2174 | iph->flow_lbl[1] = 0; | |
2175 | iph->flow_lbl[2] = 0; | |
2176 | iph->payload_len = 0; | |
2177 | iph->nexthdr = IPPROTO_NONE; | |
2178 | iph->hop_limit = 0; | |
2179 | ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); | |
2180 | ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); | |
2181 | ||
6bd52143 | 2182 | err = ip6mr_cache_unresolved(mrt, vif, skb2); |
7bc570c8 YH |
2183 | read_unlock(&mrt_lock); |
2184 | ||
2185 | return err; | |
2186 | } | |
2187 | ||
2188 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
2189 | cache->mfc_flags |= MFC_NOTIFY; | |
2190 | ||
5b285cac | 2191 | err = __ip6mr_fill_mroute(mrt, skb, cache, rtm); |
7bc570c8 YH |
2192 | read_unlock(&mrt_lock); |
2193 | return err; | |
2194 | } | |
2195 | ||
5b285cac PM |
2196 | static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
2197 | u32 pid, u32 seq, struct mfc6_cache *c) | |
2198 | { | |
2199 | struct nlmsghdr *nlh; | |
2200 | struct rtmsg *rtm; | |
2201 | ||
2202 | nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); | |
2203 | if (nlh == NULL) | |
2204 | return -EMSGSIZE; | |
2205 | ||
2206 | rtm = nlmsg_data(nlh); | |
2207 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2208 | rtm->rtm_dst_len = 128; | |
2209 | rtm->rtm_src_len = 128; | |
2210 | rtm->rtm_tos = 0; | |
2211 | rtm->rtm_table = mrt->id; | |
2212 | NLA_PUT_U32(skb, RTA_TABLE, mrt->id); | |
2213 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2214 | rtm->rtm_protocol = RTPROT_UNSPEC; | |
2215 | rtm->rtm_flags = 0; | |
2216 | ||
2217 | NLA_PUT(skb, RTA_SRC, 16, &c->mf6c_origin); | |
2218 | NLA_PUT(skb, RTA_DST, 16, &c->mf6c_mcastgrp); | |
2219 | ||
2220 | if (__ip6mr_fill_mroute(mrt, skb, c, rtm) < 0) | |
2221 | goto nla_put_failure; | |
2222 | ||
2223 | return nlmsg_end(skb, nlh); | |
2224 | ||
2225 | nla_put_failure: | |
2226 | nlmsg_cancel(skb, nlh); | |
2227 | return -EMSGSIZE; | |
2228 | } | |
2229 | ||
2230 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) | |
2231 | { | |
2232 | struct net *net = sock_net(skb->sk); | |
2233 | struct mr6_table *mrt; | |
2234 | struct mfc6_cache *mfc; | |
2235 | unsigned int t = 0, s_t; | |
2236 | unsigned int h = 0, s_h; | |
2237 | unsigned int e = 0, s_e; | |
2238 | ||
2239 | s_t = cb->args[0]; | |
2240 | s_h = cb->args[1]; | |
2241 | s_e = cb->args[2]; | |
2242 | ||
2243 | read_lock(&mrt_lock); | |
2244 | ip6mr_for_each_table(mrt, net) { | |
2245 | if (t < s_t) | |
2246 | goto next_table; | |
2247 | if (t > s_t) | |
2248 | s_h = 0; | |
2249 | for (h = s_h; h < MFC6_LINES; h++) { | |
2250 | list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) { | |
2251 | if (e < s_e) | |
2252 | goto next_entry; | |
2253 | if (ip6mr_fill_mroute(mrt, skb, | |
2254 | NETLINK_CB(cb->skb).pid, | |
2255 | cb->nlh->nlmsg_seq, | |
2256 | mfc) < 0) | |
2257 | goto done; | |
2258 | next_entry: | |
2259 | e++; | |
2260 | } | |
2261 | e = s_e = 0; | |
2262 | } | |
2263 | s_h = 0; | |
2264 | next_table: | |
2265 | t++; | |
2266 | } | |
2267 | done: | |
2268 | read_unlock(&mrt_lock); | |
2269 | ||
2270 | cb->args[2] = e; | |
2271 | cb->args[1] = h; | |
2272 | cb->args[0] = t; | |
2273 | ||
2274 | return skb->len; | |
2275 | } |