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 | ||
7bc570c8 YH |
19 | #include <asm/uaccess.h> |
20 | #include <linux/types.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/timer.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/fcntl.h> | |
27 | #include <linux/stat.h> | |
28 | #include <linux/socket.h> | |
7bc570c8 YH |
29 | #include <linux/inet.h> |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/inetdevice.h> | |
7bc570c8 YH |
32 | #include <linux/proc_fs.h> |
33 | #include <linux/seq_file.h> | |
7bc570c8 | 34 | #include <linux/init.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
e2d57766 | 36 | #include <linux/compat.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> | |
bc3b2d7f | 53 | #include <linux/export.h> |
5d6e430d | 54 | #include <net/ip6_checksum.h> |
d67b8c61 | 55 | #include <linux/netconf.h> |
7bc570c8 | 56 | |
6bd52143 | 57 | struct mr6_table { |
d1db275d | 58 | struct list_head list; |
6bd52143 PM |
59 | #ifdef CONFIG_NET_NS |
60 | struct net *net; | |
61 | #endif | |
d1db275d | 62 | u32 id; |
6bd52143 PM |
63 | struct sock *mroute6_sk; |
64 | struct timer_list ipmr_expire_timer; | |
65 | struct list_head mfc6_unres_queue; | |
66 | struct list_head mfc6_cache_array[MFC6_LINES]; | |
67 | struct mif_device vif6_table[MAXMIFS]; | |
68 | int maxvif; | |
69 | atomic_t cache_resolve_queue_len; | |
53d6841d JP |
70 | bool mroute_do_assert; |
71 | bool mroute_do_pim; | |
6bd52143 PM |
72 | #ifdef CONFIG_IPV6_PIMSM_V2 |
73 | int mroute_reg_vif_num; | |
74 | #endif | |
75 | }; | |
76 | ||
d1db275d PM |
77 | struct ip6mr_rule { |
78 | struct fib_rule common; | |
79 | }; | |
80 | ||
81 | struct ip6mr_result { | |
82 | struct mr6_table *mrt; | |
83 | }; | |
84 | ||
7bc570c8 YH |
85 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
86 | Note that the changes are semaphored via rtnl_lock. | |
87 | */ | |
88 | ||
89 | static DEFINE_RWLOCK(mrt_lock); | |
90 | ||
91 | /* | |
92 | * Multicast router control variables | |
93 | */ | |
94 | ||
6bd52143 | 95 | #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL) |
7bc570c8 | 96 | |
7bc570c8 YH |
97 | /* Special spinlock for queue of unresolved entries */ |
98 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
99 | ||
100 | /* We return to original Alan's scheme. Hash table of resolved | |
101 | entries is changed only in process context and protected | |
102 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
103 | with strong spinlock mfc_unres_lock. | |
104 | ||
105 | In this case data path is free of exclusive locks at all. | |
106 | */ | |
107 | ||
108 | static struct kmem_cache *mrt_cachep __read_mostly; | |
109 | ||
d1db275d PM |
110 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id); |
111 | static void ip6mr_free_table(struct mr6_table *mrt); | |
112 | ||
6bd52143 PM |
113 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
114 | struct sk_buff *skb, struct mfc6_cache *cache); | |
115 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, | |
8229efda | 116 | mifi_t mifi, int assert); |
5b285cac PM |
117 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
118 | struct mfc6_cache *c, struct rtmsg *rtm); | |
119 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, | |
120 | struct netlink_callback *cb); | |
6bd52143 | 121 | static void mroute_clean_tables(struct mr6_table *mrt); |
d1db275d PM |
122 | static void ipmr_expire_process(unsigned long arg); |
123 | ||
124 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
8ffb335e | 125 | #define ip6mr_for_each_table(mrt, net) \ |
d1db275d PM |
126 | list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list) |
127 | ||
128 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) | |
129 | { | |
130 | struct mr6_table *mrt; | |
131 | ||
132 | ip6mr_for_each_table(mrt, net) { | |
133 | if (mrt->id == id) | |
134 | return mrt; | |
135 | } | |
136 | return NULL; | |
137 | } | |
138 | ||
4c9483b2 | 139 | static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
d1db275d PM |
140 | struct mr6_table **mrt) |
141 | { | |
142 | struct ip6mr_result res; | |
143 | struct fib_lookup_arg arg = { .result = &res, }; | |
144 | int err; | |
145 | ||
4c9483b2 DM |
146 | err = fib_rules_lookup(net->ipv6.mr6_rules_ops, |
147 | flowi6_to_flowi(flp6), 0, &arg); | |
d1db275d PM |
148 | if (err < 0) |
149 | return err; | |
150 | *mrt = res.mrt; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
155 | int flags, struct fib_lookup_arg *arg) | |
156 | { | |
157 | struct ip6mr_result *res = arg->result; | |
158 | struct mr6_table *mrt; | |
159 | ||
160 | switch (rule->action) { | |
161 | case FR_ACT_TO_TBL: | |
162 | break; | |
163 | case FR_ACT_UNREACHABLE: | |
164 | return -ENETUNREACH; | |
165 | case FR_ACT_PROHIBIT: | |
166 | return -EACCES; | |
167 | case FR_ACT_BLACKHOLE: | |
168 | default: | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | mrt = ip6mr_get_table(rule->fr_net, rule->table); | |
173 | if (mrt == NULL) | |
174 | return -EAGAIN; | |
175 | res->mrt = mrt; | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) | |
180 | { | |
181 | return 1; | |
182 | } | |
183 | ||
184 | static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = { | |
185 | FRA_GENERIC_POLICY, | |
186 | }; | |
187 | ||
188 | static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
189 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
190 | { | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
195 | struct nlattr **tb) | |
196 | { | |
197 | return 1; | |
198 | } | |
199 | ||
200 | static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
201 | struct fib_rule_hdr *frh) | |
202 | { | |
203 | frh->dst_len = 0; | |
204 | frh->src_len = 0; | |
205 | frh->tos = 0; | |
206 | return 0; | |
207 | } | |
208 | ||
04a6f82c | 209 | static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = { |
d1db275d PM |
210 | .family = RTNL_FAMILY_IP6MR, |
211 | .rule_size = sizeof(struct ip6mr_rule), | |
212 | .addr_size = sizeof(struct in6_addr), | |
213 | .action = ip6mr_rule_action, | |
214 | .match = ip6mr_rule_match, | |
215 | .configure = ip6mr_rule_configure, | |
216 | .compare = ip6mr_rule_compare, | |
217 | .default_pref = fib_default_rule_pref, | |
218 | .fill = ip6mr_rule_fill, | |
219 | .nlgroup = RTNLGRP_IPV6_RULE, | |
220 | .policy = ip6mr_rule_policy, | |
221 | .owner = THIS_MODULE, | |
222 | }; | |
223 | ||
224 | static int __net_init ip6mr_rules_init(struct net *net) | |
225 | { | |
226 | struct fib_rules_ops *ops; | |
227 | struct mr6_table *mrt; | |
228 | int err; | |
229 | ||
230 | ops = fib_rules_register(&ip6mr_rules_ops_template, net); | |
231 | if (IS_ERR(ops)) | |
232 | return PTR_ERR(ops); | |
233 | ||
234 | INIT_LIST_HEAD(&net->ipv6.mr6_tables); | |
235 | ||
236 | mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); | |
237 | if (mrt == NULL) { | |
238 | err = -ENOMEM; | |
239 | goto err1; | |
240 | } | |
241 | ||
242 | err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); | |
243 | if (err < 0) | |
244 | goto err2; | |
245 | ||
246 | net->ipv6.mr6_rules_ops = ops; | |
247 | return 0; | |
248 | ||
249 | err2: | |
250 | kfree(mrt); | |
251 | err1: | |
252 | fib_rules_unregister(ops); | |
253 | return err; | |
254 | } | |
255 | ||
256 | static void __net_exit ip6mr_rules_exit(struct net *net) | |
257 | { | |
258 | struct mr6_table *mrt, *next; | |
259 | ||
035320d5 ED |
260 | list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { |
261 | list_del(&mrt->list); | |
d1db275d | 262 | ip6mr_free_table(mrt); |
035320d5 | 263 | } |
d1db275d PM |
264 | fib_rules_unregister(net->ipv6.mr6_rules_ops); |
265 | } | |
266 | #else | |
267 | #define ip6mr_for_each_table(mrt, net) \ | |
268 | for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) | |
269 | ||
270 | static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) | |
271 | { | |
272 | return net->ipv6.mrt6; | |
273 | } | |
274 | ||
4c9483b2 | 275 | static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, |
d1db275d PM |
276 | struct mr6_table **mrt) |
277 | { | |
278 | *mrt = net->ipv6.mrt6; | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int __net_init ip6mr_rules_init(struct net *net) | |
283 | { | |
284 | net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT); | |
285 | return net->ipv6.mrt6 ? 0 : -ENOMEM; | |
286 | } | |
287 | ||
288 | static void __net_exit ip6mr_rules_exit(struct net *net) | |
289 | { | |
290 | ip6mr_free_table(net->ipv6.mrt6); | |
291 | } | |
292 | #endif | |
293 | ||
294 | static struct mr6_table *ip6mr_new_table(struct net *net, u32 id) | |
295 | { | |
296 | struct mr6_table *mrt; | |
297 | unsigned int i; | |
298 | ||
299 | mrt = ip6mr_get_table(net, id); | |
300 | if (mrt != NULL) | |
301 | return mrt; | |
302 | ||
303 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
304 | if (mrt == NULL) | |
305 | return NULL; | |
306 | mrt->id = id; | |
307 | write_pnet(&mrt->net, net); | |
308 | ||
309 | /* Forwarding cache */ | |
310 | for (i = 0; i < MFC6_LINES; i++) | |
311 | INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]); | |
312 | ||
313 | INIT_LIST_HEAD(&mrt->mfc6_unres_queue); | |
314 | ||
315 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
316 | (unsigned long)mrt); | |
317 | ||
318 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
319 | mrt->mroute_reg_vif_num = -1; | |
320 | #endif | |
321 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
322 | list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); | |
323 | #endif | |
324 | return mrt; | |
325 | } | |
7bc570c8 | 326 | |
d1db275d PM |
327 | static void ip6mr_free_table(struct mr6_table *mrt) |
328 | { | |
329 | del_timer(&mrt->ipmr_expire_timer); | |
330 | mroute_clean_tables(mrt); | |
331 | kfree(mrt); | |
332 | } | |
7bc570c8 YH |
333 | |
334 | #ifdef CONFIG_PROC_FS | |
335 | ||
336 | struct ipmr_mfc_iter { | |
8b90fc7e | 337 | struct seq_net_private p; |
d1db275d | 338 | struct mr6_table *mrt; |
f30a7784 | 339 | struct list_head *cache; |
7bc570c8 YH |
340 | int ct; |
341 | }; | |
342 | ||
343 | ||
8b90fc7e BT |
344 | static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, |
345 | struct ipmr_mfc_iter *it, loff_t pos) | |
7bc570c8 | 346 | { |
d1db275d | 347 | struct mr6_table *mrt = it->mrt; |
7bc570c8 YH |
348 | struct mfc6_cache *mfc; |
349 | ||
7bc570c8 | 350 | read_lock(&mrt_lock); |
f30a7784 | 351 | for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) { |
6bd52143 | 352 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 | 353 | list_for_each_entry(mfc, it->cache, list) |
7bc570c8 YH |
354 | if (pos-- == 0) |
355 | return mfc; | |
f30a7784 | 356 | } |
7bc570c8 YH |
357 | read_unlock(&mrt_lock); |
358 | ||
7bc570c8 | 359 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 360 | it->cache = &mrt->mfc6_unres_queue; |
f30a7784 | 361 | list_for_each_entry(mfc, it->cache, list) |
c476efbc | 362 | if (pos-- == 0) |
7bc570c8 YH |
363 | return mfc; |
364 | spin_unlock_bh(&mfc_unres_lock); | |
365 | ||
366 | it->cache = NULL; | |
367 | return NULL; | |
368 | } | |
369 | ||
7bc570c8 YH |
370 | /* |
371 | * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif | |
372 | */ | |
373 | ||
374 | struct ipmr_vif_iter { | |
8b90fc7e | 375 | struct seq_net_private p; |
d1db275d | 376 | struct mr6_table *mrt; |
7bc570c8 YH |
377 | int ct; |
378 | }; | |
379 | ||
8b90fc7e BT |
380 | static struct mif_device *ip6mr_vif_seq_idx(struct net *net, |
381 | struct ipmr_vif_iter *iter, | |
7bc570c8 YH |
382 | loff_t pos) |
383 | { | |
d1db275d | 384 | struct mr6_table *mrt = iter->mrt; |
6bd52143 PM |
385 | |
386 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
387 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 YH |
388 | continue; |
389 | if (pos-- == 0) | |
6bd52143 | 390 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
391 | } |
392 | return NULL; | |
393 | } | |
394 | ||
395 | static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
396 | __acquires(mrt_lock) | |
397 | { | |
d1db275d | 398 | struct ipmr_vif_iter *iter = seq->private; |
8b90fc7e | 399 | struct net *net = seq_file_net(seq); |
d1db275d PM |
400 | struct mr6_table *mrt; |
401 | ||
402 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); | |
403 | if (mrt == NULL) | |
404 | return ERR_PTR(-ENOENT); | |
405 | ||
406 | iter->mrt = mrt; | |
8b90fc7e | 407 | |
7bc570c8 | 408 | read_lock(&mrt_lock); |
8b90fc7e BT |
409 | return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) |
410 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
411 | } |
412 | ||
413 | static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
414 | { | |
415 | struct ipmr_vif_iter *iter = seq->private; | |
8b90fc7e | 416 | struct net *net = seq_file_net(seq); |
d1db275d | 417 | struct mr6_table *mrt = iter->mrt; |
7bc570c8 YH |
418 | |
419 | ++*pos; | |
420 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 421 | return ip6mr_vif_seq_idx(net, iter, 0); |
7bc570c8 | 422 | |
6bd52143 PM |
423 | while (++iter->ct < mrt->maxvif) { |
424 | if (!MIF_EXISTS(mrt, iter->ct)) | |
7bc570c8 | 425 | continue; |
6bd52143 | 426 | return &mrt->vif6_table[iter->ct]; |
7bc570c8 YH |
427 | } |
428 | return NULL; | |
429 | } | |
430 | ||
431 | static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) | |
432 | __releases(mrt_lock) | |
433 | { | |
434 | read_unlock(&mrt_lock); | |
435 | } | |
436 | ||
437 | static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) | |
438 | { | |
d1db275d PM |
439 | struct ipmr_vif_iter *iter = seq->private; |
440 | struct mr6_table *mrt = iter->mrt; | |
8b90fc7e | 441 | |
7bc570c8 YH |
442 | if (v == SEQ_START_TOKEN) { |
443 | seq_puts(seq, | |
444 | "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); | |
445 | } else { | |
446 | const struct mif_device *vif = v; | |
447 | const char *name = vif->dev ? vif->dev->name : "none"; | |
448 | ||
449 | seq_printf(seq, | |
d430a227 | 450 | "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", |
6bd52143 | 451 | vif - mrt->vif6_table, |
7bc570c8 YH |
452 | name, vif->bytes_in, vif->pkt_in, |
453 | vif->bytes_out, vif->pkt_out, | |
454 | vif->flags); | |
455 | } | |
456 | return 0; | |
457 | } | |
458 | ||
98147d52 | 459 | static const struct seq_operations ip6mr_vif_seq_ops = { |
7bc570c8 YH |
460 | .start = ip6mr_vif_seq_start, |
461 | .next = ip6mr_vif_seq_next, | |
462 | .stop = ip6mr_vif_seq_stop, | |
463 | .show = ip6mr_vif_seq_show, | |
464 | }; | |
465 | ||
466 | static int ip6mr_vif_open(struct inode *inode, struct file *file) | |
467 | { | |
8b90fc7e BT |
468 | return seq_open_net(inode, file, &ip6mr_vif_seq_ops, |
469 | sizeof(struct ipmr_vif_iter)); | |
7bc570c8 YH |
470 | } |
471 | ||
5ca1b998 | 472 | static const struct file_operations ip6mr_vif_fops = { |
7bc570c8 YH |
473 | .owner = THIS_MODULE, |
474 | .open = ip6mr_vif_open, | |
475 | .read = seq_read, | |
476 | .llseek = seq_lseek, | |
8b90fc7e | 477 | .release = seq_release_net, |
7bc570c8 YH |
478 | }; |
479 | ||
480 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
481 | { | |
d1db275d | 482 | struct ipmr_mfc_iter *it = seq->private; |
8b90fc7e | 483 | struct net *net = seq_file_net(seq); |
d1db275d | 484 | struct mr6_table *mrt; |
8b90fc7e | 485 | |
d1db275d PM |
486 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
487 | if (mrt == NULL) | |
488 | return ERR_PTR(-ENOENT); | |
489 | ||
490 | it->mrt = mrt; | |
8b90fc7e BT |
491 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
492 | : SEQ_START_TOKEN; | |
7bc570c8 YH |
493 | } |
494 | ||
495 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
496 | { | |
497 | struct mfc6_cache *mfc = v; | |
498 | struct ipmr_mfc_iter *it = seq->private; | |
8b90fc7e | 499 | struct net *net = seq_file_net(seq); |
d1db275d | 500 | struct mr6_table *mrt = it->mrt; |
7bc570c8 YH |
501 | |
502 | ++*pos; | |
503 | ||
504 | if (v == SEQ_START_TOKEN) | |
8b90fc7e | 505 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
7bc570c8 | 506 | |
f30a7784 PM |
507 | if (mfc->list.next != it->cache) |
508 | return list_entry(mfc->list.next, struct mfc6_cache, list); | |
7bc570c8 | 509 | |
6bd52143 | 510 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 YH |
511 | goto end_of_list; |
512 | ||
6bd52143 | 513 | BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]); |
7bc570c8 | 514 | |
4a6258a0 | 515 | while (++it->ct < MFC6_LINES) { |
6bd52143 | 516 | it->cache = &mrt->mfc6_cache_array[it->ct]; |
f30a7784 PM |
517 | if (list_empty(it->cache)) |
518 | continue; | |
519 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
520 | } |
521 | ||
522 | /* exhausted cache_array, show unresolved */ | |
523 | read_unlock(&mrt_lock); | |
6bd52143 | 524 | it->cache = &mrt->mfc6_unres_queue; |
7bc570c8 YH |
525 | it->ct = 0; |
526 | ||
527 | spin_lock_bh(&mfc_unres_lock); | |
f30a7784 PM |
528 | if (!list_empty(it->cache)) |
529 | return list_first_entry(it->cache, struct mfc6_cache, list); | |
7bc570c8 YH |
530 | |
531 | end_of_list: | |
532 | spin_unlock_bh(&mfc_unres_lock); | |
533 | it->cache = NULL; | |
534 | ||
535 | return NULL; | |
536 | } | |
537 | ||
538 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
539 | { | |
540 | struct ipmr_mfc_iter *it = seq->private; | |
d1db275d | 541 | struct mr6_table *mrt = it->mrt; |
7bc570c8 | 542 | |
6bd52143 | 543 | if (it->cache == &mrt->mfc6_unres_queue) |
7bc570c8 | 544 | spin_unlock_bh(&mfc_unres_lock); |
6bd52143 | 545 | else if (it->cache == mrt->mfc6_cache_array) |
7bc570c8 YH |
546 | read_unlock(&mrt_lock); |
547 | } | |
548 | ||
549 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
550 | { | |
551 | int n; | |
552 | ||
553 | if (v == SEQ_START_TOKEN) { | |
554 | seq_puts(seq, | |
555 | "Group " | |
556 | "Origin " | |
557 | "Iif Pkts Bytes Wrong Oifs\n"); | |
558 | } else { | |
559 | const struct mfc6_cache *mfc = v; | |
560 | const struct ipmr_mfc_iter *it = seq->private; | |
d1db275d | 561 | struct mr6_table *mrt = it->mrt; |
7bc570c8 | 562 | |
999890b2 | 563 | seq_printf(seq, "%pI6 %pI6 %-3hd", |
0c6ce78a | 564 | &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, |
1ea472e2 | 565 | mfc->mf6c_parent); |
7bc570c8 | 566 | |
6bd52143 | 567 | if (it->cache != &mrt->mfc6_unres_queue) { |
1ea472e2 BT |
568 | seq_printf(seq, " %8lu %8lu %8lu", |
569 | mfc->mfc_un.res.pkt, | |
570 | mfc->mfc_un.res.bytes, | |
571 | mfc->mfc_un.res.wrong_if); | |
7bc570c8 YH |
572 | for (n = mfc->mfc_un.res.minvif; |
573 | n < mfc->mfc_un.res.maxvif; n++) { | |
6bd52143 | 574 | if (MIF_EXISTS(mrt, n) && |
7bc570c8 YH |
575 | mfc->mfc_un.res.ttls[n] < 255) |
576 | seq_printf(seq, | |
577 | " %2d:%-3d", | |
578 | n, mfc->mfc_un.res.ttls[n]); | |
579 | } | |
1ea472e2 BT |
580 | } else { |
581 | /* unresolved mfc_caches don't contain | |
582 | * pkt, bytes and wrong_if values | |
583 | */ | |
584 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
7bc570c8 YH |
585 | } |
586 | seq_putc(seq, '\n'); | |
587 | } | |
588 | return 0; | |
589 | } | |
590 | ||
88e9d34c | 591 | static const struct seq_operations ipmr_mfc_seq_ops = { |
7bc570c8 YH |
592 | .start = ipmr_mfc_seq_start, |
593 | .next = ipmr_mfc_seq_next, | |
594 | .stop = ipmr_mfc_seq_stop, | |
595 | .show = ipmr_mfc_seq_show, | |
596 | }; | |
597 | ||
598 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
599 | { | |
8b90fc7e BT |
600 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
601 | sizeof(struct ipmr_mfc_iter)); | |
7bc570c8 YH |
602 | } |
603 | ||
5ca1b998 | 604 | static const struct file_operations ip6mr_mfc_fops = { |
7bc570c8 YH |
605 | .owner = THIS_MODULE, |
606 | .open = ipmr_mfc_open, | |
607 | .read = seq_read, | |
608 | .llseek = seq_lseek, | |
8b90fc7e | 609 | .release = seq_release_net, |
7bc570c8 YH |
610 | }; |
611 | #endif | |
612 | ||
14fb64e1 | 613 | #ifdef CONFIG_IPV6_PIMSM_V2 |
14fb64e1 YH |
614 | |
615 | static int pim6_rcv(struct sk_buff *skb) | |
616 | { | |
617 | struct pimreghdr *pim; | |
618 | struct ipv6hdr *encap; | |
619 | struct net_device *reg_dev = NULL; | |
8229efda | 620 | struct net *net = dev_net(skb->dev); |
d1db275d | 621 | struct mr6_table *mrt; |
4c9483b2 DM |
622 | struct flowi6 fl6 = { |
623 | .flowi6_iif = skb->dev->ifindex, | |
624 | .flowi6_mark = skb->mark, | |
d1db275d PM |
625 | }; |
626 | int reg_vif_num; | |
14fb64e1 YH |
627 | |
628 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) | |
629 | goto drop; | |
630 | ||
631 | pim = (struct pimreghdr *)skb_transport_header(skb); | |
632 | if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || | |
633 | (pim->flags & PIM_NULL_REGISTER) || | |
1d6e55f1 TG |
634 | (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
635 | sizeof(*pim), IPPROTO_PIM, | |
636 | csum_partial((void *)pim, sizeof(*pim), 0)) && | |
ec6b486f | 637 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
14fb64e1 YH |
638 | goto drop; |
639 | ||
640 | /* check if the inner packet is destined to mcast group */ | |
641 | encap = (struct ipv6hdr *)(skb_transport_header(skb) + | |
642 | sizeof(*pim)); | |
643 | ||
644 | if (!ipv6_addr_is_multicast(&encap->daddr) || | |
645 | encap->payload_len == 0 || | |
646 | ntohs(encap->payload_len) + sizeof(*pim) > skb->len) | |
647 | goto drop; | |
648 | ||
4c9483b2 | 649 | if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
d1db275d PM |
650 | goto drop; |
651 | reg_vif_num = mrt->mroute_reg_vif_num; | |
652 | ||
14fb64e1 YH |
653 | read_lock(&mrt_lock); |
654 | if (reg_vif_num >= 0) | |
6bd52143 | 655 | reg_dev = mrt->vif6_table[reg_vif_num].dev; |
14fb64e1 YH |
656 | if (reg_dev) |
657 | dev_hold(reg_dev); | |
658 | read_unlock(&mrt_lock); | |
659 | ||
660 | if (reg_dev == NULL) | |
661 | goto drop; | |
662 | ||
663 | skb->mac_header = skb->network_header; | |
664 | skb_pull(skb, (u8 *)encap - skb->data); | |
665 | skb_reset_network_header(skb); | |
1d6e55f1 | 666 | skb->protocol = htons(ETH_P_IPV6); |
3e49e6d5 | 667 | skb->ip_summed = CHECKSUM_NONE; |
14fb64e1 | 668 | skb->pkt_type = PACKET_HOST; |
d19d56dd ED |
669 | |
670 | skb_tunnel_rx(skb, reg_dev); | |
671 | ||
caf586e5 | 672 | netif_rx(skb); |
8990f468 | 673 | |
14fb64e1 YH |
674 | dev_put(reg_dev); |
675 | return 0; | |
676 | drop: | |
677 | kfree_skb(skb); | |
678 | return 0; | |
679 | } | |
680 | ||
41135cc8 | 681 | static const struct inet6_protocol pim6_protocol = { |
14fb64e1 YH |
682 | .handler = pim6_rcv, |
683 | }; | |
684 | ||
685 | /* Service routines creating virtual interfaces: PIMREG */ | |
686 | ||
6fef4c0c SH |
687 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, |
688 | struct net_device *dev) | |
14fb64e1 | 689 | { |
8229efda | 690 | struct net *net = dev_net(dev); |
d1db275d | 691 | struct mr6_table *mrt; |
4c9483b2 DM |
692 | struct flowi6 fl6 = { |
693 | .flowi6_oif = dev->ifindex, | |
694 | .flowi6_iif = skb->skb_iif, | |
695 | .flowi6_mark = skb->mark, | |
d1db275d PM |
696 | }; |
697 | int err; | |
698 | ||
4c9483b2 | 699 | err = ip6mr_fib_lookup(net, &fl6, &mrt); |
67928c40 BG |
700 | if (err < 0) { |
701 | kfree_skb(skb); | |
d1db275d | 702 | return err; |
67928c40 | 703 | } |
8229efda | 704 | |
14fb64e1 | 705 | read_lock(&mrt_lock); |
dc58c78c PE |
706 | dev->stats.tx_bytes += skb->len; |
707 | dev->stats.tx_packets++; | |
6bd52143 | 708 | ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); |
14fb64e1 YH |
709 | read_unlock(&mrt_lock); |
710 | kfree_skb(skb); | |
6ed10654 | 711 | return NETDEV_TX_OK; |
14fb64e1 YH |
712 | } |
713 | ||
007c3838 SH |
714 | static const struct net_device_ops reg_vif_netdev_ops = { |
715 | .ndo_start_xmit = reg_vif_xmit, | |
716 | }; | |
717 | ||
14fb64e1 YH |
718 | static void reg_vif_setup(struct net_device *dev) |
719 | { | |
720 | dev->type = ARPHRD_PIMREG; | |
721 | dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; | |
722 | dev->flags = IFF_NOARP; | |
007c3838 | 723 | dev->netdev_ops = ®_vif_netdev_ops; |
14fb64e1 | 724 | dev->destructor = free_netdev; |
403dbb97 | 725 | dev->features |= NETIF_F_NETNS_LOCAL; |
14fb64e1 YH |
726 | } |
727 | ||
d1db275d | 728 | static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt) |
14fb64e1 YH |
729 | { |
730 | struct net_device *dev; | |
d1db275d PM |
731 | char name[IFNAMSIZ]; |
732 | ||
733 | if (mrt->id == RT6_TABLE_DFLT) | |
734 | sprintf(name, "pim6reg"); | |
735 | else | |
736 | sprintf(name, "pim6reg%u", mrt->id); | |
14fb64e1 | 737 | |
d1db275d | 738 | dev = alloc_netdev(0, name, reg_vif_setup); |
14fb64e1 YH |
739 | if (dev == NULL) |
740 | return NULL; | |
741 | ||
8229efda BT |
742 | dev_net_set(dev, net); |
743 | ||
14fb64e1 YH |
744 | if (register_netdevice(dev)) { |
745 | free_netdev(dev); | |
746 | return NULL; | |
747 | } | |
748 | dev->iflink = 0; | |
749 | ||
14fb64e1 YH |
750 | if (dev_open(dev)) |
751 | goto failure; | |
752 | ||
7af3db78 | 753 | dev_hold(dev); |
14fb64e1 YH |
754 | return dev; |
755 | ||
756 | failure: | |
757 | /* allow the register to be completed before unregistering. */ | |
758 | rtnl_unlock(); | |
759 | rtnl_lock(); | |
760 | ||
761 | unregister_netdevice(dev); | |
762 | return NULL; | |
763 | } | |
764 | #endif | |
765 | ||
7bc570c8 YH |
766 | /* |
767 | * Delete a VIF entry | |
768 | */ | |
769 | ||
6bd52143 | 770 | static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head) |
7bc570c8 YH |
771 | { |
772 | struct mif_device *v; | |
773 | struct net_device *dev; | |
1d6e55f1 | 774 | struct inet6_dev *in6_dev; |
6bd52143 PM |
775 | |
776 | if (vifi < 0 || vifi >= mrt->maxvif) | |
7bc570c8 YH |
777 | return -EADDRNOTAVAIL; |
778 | ||
6bd52143 | 779 | v = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
780 | |
781 | write_lock_bh(&mrt_lock); | |
782 | dev = v->dev; | |
783 | v->dev = NULL; | |
784 | ||
785 | if (!dev) { | |
786 | write_unlock_bh(&mrt_lock); | |
787 | return -EADDRNOTAVAIL; | |
788 | } | |
789 | ||
14fb64e1 | 790 | #ifdef CONFIG_IPV6_PIMSM_V2 |
6bd52143 PM |
791 | if (vifi == mrt->mroute_reg_vif_num) |
792 | mrt->mroute_reg_vif_num = -1; | |
14fb64e1 YH |
793 | #endif |
794 | ||
6bd52143 | 795 | if (vifi + 1 == mrt->maxvif) { |
7bc570c8 YH |
796 | int tmp; |
797 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
6bd52143 | 798 | if (MIF_EXISTS(mrt, tmp)) |
7bc570c8 YH |
799 | break; |
800 | } | |
6bd52143 | 801 | mrt->maxvif = tmp + 1; |
7bc570c8 YH |
802 | } |
803 | ||
804 | write_unlock_bh(&mrt_lock); | |
805 | ||
806 | dev_set_allmulti(dev, -1); | |
807 | ||
1d6e55f1 | 808 | in6_dev = __in6_dev_get(dev); |
d67b8c61 | 809 | if (in6_dev) { |
1d6e55f1 | 810 | in6_dev->cnf.mc_forwarding--; |
d67b8c61 ND |
811 | inet6_netconf_notify_devconf(dev_net(dev), |
812 | NETCONFA_MC_FORWARDING, | |
813 | dev->ifindex, &in6_dev->cnf); | |
814 | } | |
1d6e55f1 | 815 | |
7bc570c8 | 816 | if (v->flags & MIFF_REGISTER) |
c871e664 | 817 | unregister_netdevice_queue(dev, head); |
7bc570c8 YH |
818 | |
819 | dev_put(dev); | |
820 | return 0; | |
821 | } | |
822 | ||
58701ad4 BT |
823 | static inline void ip6mr_cache_free(struct mfc6_cache *c) |
824 | { | |
58701ad4 BT |
825 | kmem_cache_free(mrt_cachep, c); |
826 | } | |
827 | ||
7bc570c8 YH |
828 | /* Destroy an unresolved cache entry, killing queued skbs |
829 | and reporting error to netlink readers. | |
830 | */ | |
831 | ||
6bd52143 | 832 | static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c) |
7bc570c8 | 833 | { |
6bd52143 | 834 | struct net *net = read_pnet(&mrt->net); |
7bc570c8 YH |
835 | struct sk_buff *skb; |
836 | ||
6bd52143 | 837 | atomic_dec(&mrt->cache_resolve_queue_len); |
7bc570c8 YH |
838 | |
839 | while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { | |
840 | if (ipv6_hdr(skb)->version == 0) { | |
841 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); | |
842 | nlh->nlmsg_type = NLMSG_ERROR; | |
843 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
844 | skb_trim(skb, nlh->nlmsg_len); | |
845 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; | |
15e47304 | 846 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
7bc570c8 YH |
847 | } else |
848 | kfree_skb(skb); | |
849 | } | |
850 | ||
58701ad4 | 851 | ip6mr_cache_free(c); |
7bc570c8 YH |
852 | } |
853 | ||
854 | ||
c476efbc | 855 | /* Timer process for all the unresolved queue. */ |
7bc570c8 | 856 | |
6bd52143 | 857 | static void ipmr_do_expire_process(struct mr6_table *mrt) |
7bc570c8 YH |
858 | { |
859 | unsigned long now = jiffies; | |
860 | unsigned long expires = 10 * HZ; | |
f30a7784 | 861 | struct mfc6_cache *c, *next; |
7bc570c8 | 862 | |
6bd52143 | 863 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
7bc570c8 YH |
864 | if (time_after(c->mfc_un.unres.expires, now)) { |
865 | /* not yet... */ | |
866 | unsigned long interval = c->mfc_un.unres.expires - now; | |
867 | if (interval < expires) | |
868 | expires = interval; | |
7bc570c8 YH |
869 | continue; |
870 | } | |
871 | ||
f30a7784 | 872 | list_del(&c->list); |
6bd52143 | 873 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
874 | } |
875 | ||
6bd52143 PM |
876 | if (!list_empty(&mrt->mfc6_unres_queue)) |
877 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
7bc570c8 YH |
878 | } |
879 | ||
c476efbc | 880 | static void ipmr_expire_process(unsigned long arg) |
7bc570c8 | 881 | { |
6bd52143 | 882 | struct mr6_table *mrt = (struct mr6_table *)arg; |
c476efbc | 883 | |
7bc570c8 | 884 | if (!spin_trylock(&mfc_unres_lock)) { |
6bd52143 | 885 | mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); |
7bc570c8 YH |
886 | return; |
887 | } | |
888 | ||
6bd52143 PM |
889 | if (!list_empty(&mrt->mfc6_unres_queue)) |
890 | ipmr_do_expire_process(mrt); | |
7bc570c8 YH |
891 | |
892 | spin_unlock(&mfc_unres_lock); | |
893 | } | |
894 | ||
895 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
896 | ||
6bd52143 | 897 | static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache, |
b5aa30b1 | 898 | unsigned char *ttls) |
7bc570c8 YH |
899 | { |
900 | int vifi; | |
901 | ||
6ac7eb08 | 902 | cache->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 | 903 | cache->mfc_un.res.maxvif = 0; |
6ac7eb08 | 904 | memset(cache->mfc_un.res.ttls, 255, MAXMIFS); |
7bc570c8 | 905 | |
6bd52143 PM |
906 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
907 | if (MIF_EXISTS(mrt, vifi) && | |
4e16880c | 908 | ttls[vifi] && ttls[vifi] < 255) { |
7bc570c8 YH |
909 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
910 | if (cache->mfc_un.res.minvif > vifi) | |
911 | cache->mfc_un.res.minvif = vifi; | |
912 | if (cache->mfc_un.res.maxvif <= vifi) | |
913 | cache->mfc_un.res.maxvif = vifi + 1; | |
914 | } | |
915 | } | |
916 | } | |
917 | ||
6bd52143 PM |
918 | static int mif6_add(struct net *net, struct mr6_table *mrt, |
919 | struct mif6ctl *vifc, int mrtsock) | |
7bc570c8 YH |
920 | { |
921 | int vifi = vifc->mif6c_mifi; | |
6bd52143 | 922 | struct mif_device *v = &mrt->vif6_table[vifi]; |
7bc570c8 | 923 | struct net_device *dev; |
1d6e55f1 | 924 | struct inet6_dev *in6_dev; |
5ae7b444 | 925 | int err; |
7bc570c8 YH |
926 | |
927 | /* Is vif busy ? */ | |
6bd52143 | 928 | if (MIF_EXISTS(mrt, vifi)) |
7bc570c8 YH |
929 | return -EADDRINUSE; |
930 | ||
931 | switch (vifc->mif6c_flags) { | |
14fb64e1 YH |
932 | #ifdef CONFIG_IPV6_PIMSM_V2 |
933 | case MIFF_REGISTER: | |
934 | /* | |
935 | * Special Purpose VIF in PIM | |
936 | * All the packets will be sent to the daemon | |
937 | */ | |
6bd52143 | 938 | if (mrt->mroute_reg_vif_num >= 0) |
14fb64e1 | 939 | return -EADDRINUSE; |
d1db275d | 940 | dev = ip6mr_reg_vif(net, mrt); |
14fb64e1 YH |
941 | if (!dev) |
942 | return -ENOBUFS; | |
5ae7b444 WC |
943 | err = dev_set_allmulti(dev, 1); |
944 | if (err) { | |
945 | unregister_netdevice(dev); | |
7af3db78 | 946 | dev_put(dev); |
5ae7b444 WC |
947 | return err; |
948 | } | |
14fb64e1 YH |
949 | break; |
950 | #endif | |
7bc570c8 | 951 | case 0: |
8229efda | 952 | dev = dev_get_by_index(net, vifc->mif6c_pifi); |
7bc570c8 YH |
953 | if (!dev) |
954 | return -EADDRNOTAVAIL; | |
5ae7b444 | 955 | err = dev_set_allmulti(dev, 1); |
7af3db78 WC |
956 | if (err) { |
957 | dev_put(dev); | |
5ae7b444 | 958 | return err; |
7af3db78 | 959 | } |
7bc570c8 YH |
960 | break; |
961 | default: | |
962 | return -EINVAL; | |
963 | } | |
964 | ||
1d6e55f1 | 965 | in6_dev = __in6_dev_get(dev); |
d67b8c61 | 966 | if (in6_dev) { |
1d6e55f1 | 967 | in6_dev->cnf.mc_forwarding++; |
d67b8c61 ND |
968 | inet6_netconf_notify_devconf(dev_net(dev), |
969 | NETCONFA_MC_FORWARDING, | |
970 | dev->ifindex, &in6_dev->cnf); | |
971 | } | |
1d6e55f1 | 972 | |
7bc570c8 YH |
973 | /* |
974 | * Fill in the VIF structures | |
975 | */ | |
976 | v->rate_limit = vifc->vifc_rate_limit; | |
977 | v->flags = vifc->mif6c_flags; | |
978 | if (!mrtsock) | |
979 | v->flags |= VIFF_STATIC; | |
980 | v->threshold = vifc->vifc_threshold; | |
981 | v->bytes_in = 0; | |
982 | v->bytes_out = 0; | |
983 | v->pkt_in = 0; | |
984 | v->pkt_out = 0; | |
985 | v->link = dev->ifindex; | |
986 | if (v->flags & MIFF_REGISTER) | |
987 | v->link = dev->iflink; | |
988 | ||
989 | /* And finish update writing critical data */ | |
990 | write_lock_bh(&mrt_lock); | |
7bc570c8 | 991 | v->dev = dev; |
14fb64e1 YH |
992 | #ifdef CONFIG_IPV6_PIMSM_V2 |
993 | if (v->flags & MIFF_REGISTER) | |
6bd52143 | 994 | mrt->mroute_reg_vif_num = vifi; |
14fb64e1 | 995 | #endif |
6bd52143 PM |
996 | if (vifi + 1 > mrt->maxvif) |
997 | mrt->maxvif = vifi + 1; | |
7bc570c8 YH |
998 | write_unlock_bh(&mrt_lock); |
999 | return 0; | |
1000 | } | |
1001 | ||
6bd52143 | 1002 | static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt, |
b71d1d42 ED |
1003 | const struct in6_addr *origin, |
1004 | const struct in6_addr *mcastgrp) | |
7bc570c8 YH |
1005 | { |
1006 | int line = MFC6_HASH(mcastgrp, origin); | |
1007 | struct mfc6_cache *c; | |
1008 | ||
6bd52143 | 1009 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
1010 | if (ipv6_addr_equal(&c->mf6c_origin, origin) && |
1011 | ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) | |
f30a7784 | 1012 | return c; |
7bc570c8 | 1013 | } |
f30a7784 | 1014 | return NULL; |
7bc570c8 YH |
1015 | } |
1016 | ||
1017 | /* | |
1018 | * Allocate a multicast cache entry | |
1019 | */ | |
b5aa30b1 | 1020 | static struct mfc6_cache *ip6mr_cache_alloc(void) |
7bc570c8 | 1021 | { |
36cbac59 | 1022 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
7bc570c8 YH |
1023 | if (c == NULL) |
1024 | return NULL; | |
6ac7eb08 | 1025 | c->mfc_un.res.minvif = MAXMIFS; |
7bc570c8 YH |
1026 | return c; |
1027 | } | |
1028 | ||
b5aa30b1 | 1029 | static struct mfc6_cache *ip6mr_cache_alloc_unres(void) |
7bc570c8 | 1030 | { |
36cbac59 | 1031 | struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
7bc570c8 YH |
1032 | if (c == NULL) |
1033 | return NULL; | |
7bc570c8 YH |
1034 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
1035 | c->mfc_un.unres.expires = jiffies + 10 * HZ; | |
1036 | return c; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * A cache entry has gone into a resolved state from queued | |
1041 | */ | |
1042 | ||
6bd52143 PM |
1043 | static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt, |
1044 | struct mfc6_cache *uc, struct mfc6_cache *c) | |
7bc570c8 YH |
1045 | { |
1046 | struct sk_buff *skb; | |
1047 | ||
1048 | /* | |
1049 | * Play the pending entries through our router | |
1050 | */ | |
1051 | ||
1052 | while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { | |
1053 | if (ipv6_hdr(skb)->version == 0) { | |
7bc570c8 YH |
1054 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); |
1055 | ||
5b285cac | 1056 | if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
549e028d | 1057 | nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; |
7bc570c8 YH |
1058 | } else { |
1059 | nlh->nlmsg_type = NLMSG_ERROR; | |
1060 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
1061 | skb_trim(skb, nlh->nlmsg_len); | |
1062 | ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; | |
1063 | } | |
15e47304 | 1064 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
7bc570c8 | 1065 | } else |
6bd52143 | 1066 | ip6_mr_forward(net, mrt, skb, c); |
7bc570c8 YH |
1067 | } |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd | |
1072 | * expects the following bizarre scheme. | |
1073 | * | |
1074 | * Called under mrt_lock. | |
1075 | */ | |
1076 | ||
6bd52143 PM |
1077 | static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, |
1078 | mifi_t mifi, int assert) | |
7bc570c8 YH |
1079 | { |
1080 | struct sk_buff *skb; | |
1081 | struct mrt6msg *msg; | |
1082 | int ret; | |
1083 | ||
14fb64e1 YH |
1084 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1085 | if (assert == MRT6MSG_WHOLEPKT) | |
1086 | skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) | |
1087 | +sizeof(*msg)); | |
1088 | else | |
1089 | #endif | |
1090 | skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); | |
7bc570c8 YH |
1091 | |
1092 | if (!skb) | |
1093 | return -ENOBUFS; | |
1094 | ||
1095 | /* I suppose that internal messages | |
1096 | * do not require checksums */ | |
1097 | ||
1098 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1099 | ||
14fb64e1 YH |
1100 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1101 | if (assert == MRT6MSG_WHOLEPKT) { | |
1102 | /* Ugly, but we have no choice with this interface. | |
1103 | Duplicate old header, fix length etc. | |
1104 | And all this only to mangle msg->im6_msgtype and | |
1105 | to set msg->im6_mbz to "mbz" :-) | |
1106 | */ | |
1107 | skb_push(skb, -skb_network_offset(pkt)); | |
1108 | ||
1109 | skb_push(skb, sizeof(*msg)); | |
1110 | skb_reset_transport_header(skb); | |
1111 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
1112 | msg->im6_mbz = 0; | |
1113 | msg->im6_msgtype = MRT6MSG_WHOLEPKT; | |
6bd52143 | 1114 | msg->im6_mif = mrt->mroute_reg_vif_num; |
14fb64e1 | 1115 | msg->im6_pad = 0; |
4e3fd7a0 AD |
1116 | msg->im6_src = ipv6_hdr(pkt)->saddr; |
1117 | msg->im6_dst = ipv6_hdr(pkt)->daddr; | |
14fb64e1 YH |
1118 | |
1119 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1120 | } else | |
1121 | #endif | |
1122 | { | |
7bc570c8 YH |
1123 | /* |
1124 | * Copy the IP header | |
1125 | */ | |
1126 | ||
1127 | skb_put(skb, sizeof(struct ipv6hdr)); | |
1128 | skb_reset_network_header(skb); | |
1129 | skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); | |
1130 | ||
1131 | /* | |
1132 | * Add our header | |
1133 | */ | |
1134 | skb_put(skb, sizeof(*msg)); | |
1135 | skb_reset_transport_header(skb); | |
1136 | msg = (struct mrt6msg *)skb_transport_header(skb); | |
1137 | ||
1138 | msg->im6_mbz = 0; | |
1139 | msg->im6_msgtype = assert; | |
6ac7eb08 | 1140 | msg->im6_mif = mifi; |
7bc570c8 | 1141 | msg->im6_pad = 0; |
4e3fd7a0 AD |
1142 | msg->im6_src = ipv6_hdr(pkt)->saddr; |
1143 | msg->im6_dst = ipv6_hdr(pkt)->daddr; | |
7bc570c8 | 1144 | |
adf30907 | 1145 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
7bc570c8 | 1146 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
14fb64e1 | 1147 | } |
7bc570c8 | 1148 | |
6bd52143 | 1149 | if (mrt->mroute6_sk == NULL) { |
7bc570c8 YH |
1150 | kfree_skb(skb); |
1151 | return -EINVAL; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * Deliver to user space multicast routing algorithms | |
1156 | */ | |
6bd52143 | 1157 | ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb); |
bd91b8bf | 1158 | if (ret < 0) { |
e87cc472 | 1159 | net_warn_ratelimited("mroute6: pending queue full, dropping entries\n"); |
7bc570c8 YH |
1160 | kfree_skb(skb); |
1161 | } | |
1162 | ||
1163 | return ret; | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | * Queue a packet for resolution. It gets locked cache entry! | |
1168 | */ | |
1169 | ||
1170 | static int | |
6bd52143 | 1171 | ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb) |
7bc570c8 | 1172 | { |
f30a7784 | 1173 | bool found = false; |
7bc570c8 YH |
1174 | int err; |
1175 | struct mfc6_cache *c; | |
1176 | ||
1177 | spin_lock_bh(&mfc_unres_lock); | |
6bd52143 | 1178 | list_for_each_entry(c, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1179 | if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && |
f30a7784 PM |
1180 | ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { |
1181 | found = true; | |
7bc570c8 | 1182 | break; |
f30a7784 | 1183 | } |
7bc570c8 YH |
1184 | } |
1185 | ||
f30a7784 | 1186 | if (!found) { |
7bc570c8 YH |
1187 | /* |
1188 | * Create a new entry if allowable | |
1189 | */ | |
1190 | ||
6bd52143 | 1191 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
b5aa30b1 | 1192 | (c = ip6mr_cache_alloc_unres()) == NULL) { |
7bc570c8 YH |
1193 | spin_unlock_bh(&mfc_unres_lock); |
1194 | ||
1195 | kfree_skb(skb); | |
1196 | return -ENOBUFS; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * Fill in the new cache entry | |
1201 | */ | |
1202 | c->mf6c_parent = -1; | |
1203 | c->mf6c_origin = ipv6_hdr(skb)->saddr; | |
1204 | c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; | |
1205 | ||
1206 | /* | |
1207 | * Reflect first query at pim6sd | |
1208 | */ | |
6bd52143 | 1209 | err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); |
8229efda | 1210 | if (err < 0) { |
7bc570c8 YH |
1211 | /* If the report failed throw the cache entry |
1212 | out - Brad Parker | |
1213 | */ | |
1214 | spin_unlock_bh(&mfc_unres_lock); | |
1215 | ||
58701ad4 | 1216 | ip6mr_cache_free(c); |
7bc570c8 YH |
1217 | kfree_skb(skb); |
1218 | return err; | |
1219 | } | |
1220 | ||
6bd52143 PM |
1221 | atomic_inc(&mrt->cache_resolve_queue_len); |
1222 | list_add(&c->list, &mrt->mfc6_unres_queue); | |
7bc570c8 | 1223 | |
6bd52143 | 1224 | ipmr_do_expire_process(mrt); |
7bc570c8 YH |
1225 | } |
1226 | ||
1227 | /* | |
1228 | * See if we can append the packet | |
1229 | */ | |
1230 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1231 | kfree_skb(skb); | |
1232 | err = -ENOBUFS; | |
1233 | } else { | |
1234 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); | |
1235 | err = 0; | |
1236 | } | |
1237 | ||
1238 | spin_unlock_bh(&mfc_unres_lock); | |
1239 | return err; | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * MFC6 cache manipulation by user space | |
1244 | */ | |
1245 | ||
6bd52143 | 1246 | static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc) |
7bc570c8 YH |
1247 | { |
1248 | int line; | |
f30a7784 | 1249 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1250 | |
1251 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1252 | ||
6bd52143 | 1253 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 YH |
1254 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
1255 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { | |
1256 | write_lock_bh(&mrt_lock); | |
f30a7784 | 1257 | list_del(&c->list); |
7bc570c8 YH |
1258 | write_unlock_bh(&mrt_lock); |
1259 | ||
58701ad4 | 1260 | ip6mr_cache_free(c); |
7bc570c8 YH |
1261 | return 0; |
1262 | } | |
1263 | } | |
1264 | return -ENOENT; | |
1265 | } | |
1266 | ||
1267 | static int ip6mr_device_event(struct notifier_block *this, | |
1268 | unsigned long event, void *ptr) | |
1269 | { | |
1270 | struct net_device *dev = ptr; | |
8229efda | 1271 | struct net *net = dev_net(dev); |
d1db275d | 1272 | struct mr6_table *mrt; |
7bc570c8 YH |
1273 | struct mif_device *v; |
1274 | int ct; | |
c871e664 | 1275 | LIST_HEAD(list); |
7bc570c8 | 1276 | |
7bc570c8 YH |
1277 | if (event != NETDEV_UNREGISTER) |
1278 | return NOTIFY_DONE; | |
1279 | ||
d1db275d PM |
1280 | ip6mr_for_each_table(mrt, net) { |
1281 | v = &mrt->vif6_table[0]; | |
1282 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1283 | if (v->dev == dev) | |
1284 | mif6_delete(mrt, ct, &list); | |
1285 | } | |
7bc570c8 | 1286 | } |
c871e664 ED |
1287 | unregister_netdevice_many(&list); |
1288 | ||
7bc570c8 YH |
1289 | return NOTIFY_DONE; |
1290 | } | |
1291 | ||
1292 | static struct notifier_block ip6_mr_notifier = { | |
1293 | .notifier_call = ip6mr_device_event | |
1294 | }; | |
1295 | ||
1296 | /* | |
1297 | * Setup for IP multicast routing | |
1298 | */ | |
1299 | ||
4e16880c BT |
1300 | static int __net_init ip6mr_net_init(struct net *net) |
1301 | { | |
d1db275d | 1302 | int err; |
f30a7784 | 1303 | |
d1db275d PM |
1304 | err = ip6mr_rules_init(net); |
1305 | if (err < 0) | |
4e16880c | 1306 | goto fail; |
8b90fc7e BT |
1307 | |
1308 | #ifdef CONFIG_PROC_FS | |
1309 | err = -ENOMEM; | |
1310 | if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) | |
1311 | goto proc_vif_fail; | |
1312 | if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) | |
1313 | goto proc_cache_fail; | |
1314 | #endif | |
6bd52143 | 1315 | |
4a6258a0 BT |
1316 | return 0; |
1317 | ||
8b90fc7e BT |
1318 | #ifdef CONFIG_PROC_FS |
1319 | proc_cache_fail: | |
1320 | proc_net_remove(net, "ip6_mr_vif"); | |
1321 | proc_vif_fail: | |
d1db275d | 1322 | ip6mr_rules_exit(net); |
8b90fc7e | 1323 | #endif |
4e16880c BT |
1324 | fail: |
1325 | return err; | |
1326 | } | |
1327 | ||
1328 | static void __net_exit ip6mr_net_exit(struct net *net) | |
1329 | { | |
8b90fc7e BT |
1330 | #ifdef CONFIG_PROC_FS |
1331 | proc_net_remove(net, "ip6_mr_cache"); | |
1332 | proc_net_remove(net, "ip6_mr_vif"); | |
1333 | #endif | |
d1db275d | 1334 | ip6mr_rules_exit(net); |
4e16880c BT |
1335 | } |
1336 | ||
1337 | static struct pernet_operations ip6mr_net_ops = { | |
1338 | .init = ip6mr_net_init, | |
1339 | .exit = ip6mr_net_exit, | |
1340 | }; | |
1341 | ||
623d1a1a | 1342 | int __init ip6_mr_init(void) |
7bc570c8 | 1343 | { |
623d1a1a WC |
1344 | int err; |
1345 | ||
7bc570c8 YH |
1346 | mrt_cachep = kmem_cache_create("ip6_mrt_cache", |
1347 | sizeof(struct mfc6_cache), | |
1348 | 0, SLAB_HWCACHE_ALIGN, | |
1349 | NULL); | |
1350 | if (!mrt_cachep) | |
623d1a1a | 1351 | return -ENOMEM; |
7bc570c8 | 1352 | |
4e16880c BT |
1353 | err = register_pernet_subsys(&ip6mr_net_ops); |
1354 | if (err) | |
1355 | goto reg_pernet_fail; | |
1356 | ||
623d1a1a WC |
1357 | err = register_netdevice_notifier(&ip6_mr_notifier); |
1358 | if (err) | |
1359 | goto reg_notif_fail; | |
403dbb97 TG |
1360 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1361 | if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { | |
f3213831 | 1362 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
1363 | err = -EAGAIN; |
1364 | goto add_proto_fail; | |
1365 | } | |
1366 | #endif | |
c7ac8679 GR |
1367 | rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL, |
1368 | ip6mr_rtm_dumproute, NULL); | |
623d1a1a | 1369 | return 0; |
403dbb97 TG |
1370 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1371 | add_proto_fail: | |
1372 | unregister_netdevice_notifier(&ip6_mr_notifier); | |
1373 | #endif | |
87b30a65 | 1374 | reg_notif_fail: |
4e16880c BT |
1375 | unregister_pernet_subsys(&ip6mr_net_ops); |
1376 | reg_pernet_fail: | |
87b30a65 | 1377 | kmem_cache_destroy(mrt_cachep); |
623d1a1a | 1378 | return err; |
7bc570c8 YH |
1379 | } |
1380 | ||
623d1a1a WC |
1381 | void ip6_mr_cleanup(void) |
1382 | { | |
623d1a1a | 1383 | unregister_netdevice_notifier(&ip6_mr_notifier); |
4e16880c | 1384 | unregister_pernet_subsys(&ip6mr_net_ops); |
623d1a1a WC |
1385 | kmem_cache_destroy(mrt_cachep); |
1386 | } | |
7bc570c8 | 1387 | |
6bd52143 PM |
1388 | static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, |
1389 | struct mf6cctl *mfc, int mrtsock) | |
7bc570c8 | 1390 | { |
f30a7784 | 1391 | bool found = false; |
7bc570c8 | 1392 | int line; |
f30a7784 | 1393 | struct mfc6_cache *uc, *c; |
6ac7eb08 | 1394 | unsigned char ttls[MAXMIFS]; |
7bc570c8 YH |
1395 | int i; |
1396 | ||
a50436f2 PM |
1397 | if (mfc->mf6cc_parent >= MAXMIFS) |
1398 | return -ENFILE; | |
1399 | ||
6ac7eb08 RR |
1400 | memset(ttls, 255, MAXMIFS); |
1401 | for (i = 0; i < MAXMIFS; i++) { | |
7bc570c8 YH |
1402 | if (IF_ISSET(i, &mfc->mf6cc_ifset)) |
1403 | ttls[i] = 1; | |
1404 | ||
1405 | } | |
1406 | ||
1407 | line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); | |
1408 | ||
6bd52143 | 1409 | list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { |
7bc570c8 | 1410 | if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && |
f30a7784 PM |
1411 | ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { |
1412 | found = true; | |
7bc570c8 | 1413 | break; |
f30a7784 | 1414 | } |
7bc570c8 YH |
1415 | } |
1416 | ||
f30a7784 | 1417 | if (found) { |
7bc570c8 YH |
1418 | write_lock_bh(&mrt_lock); |
1419 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1420 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1421 | if (!mrtsock) |
1422 | c->mfc_flags |= MFC_STATIC; | |
1423 | write_unlock_bh(&mrt_lock); | |
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) | |
1428 | return -EINVAL; | |
1429 | ||
b5aa30b1 | 1430 | c = ip6mr_cache_alloc(); |
7bc570c8 YH |
1431 | if (c == NULL) |
1432 | return -ENOMEM; | |
1433 | ||
1434 | c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; | |
1435 | c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; | |
1436 | c->mf6c_parent = mfc->mf6cc_parent; | |
6bd52143 | 1437 | ip6mr_update_thresholds(mrt, c, ttls); |
7bc570c8 YH |
1438 | if (!mrtsock) |
1439 | c->mfc_flags |= MFC_STATIC; | |
1440 | ||
1441 | write_lock_bh(&mrt_lock); | |
6bd52143 | 1442 | list_add(&c->list, &mrt->mfc6_cache_array[line]); |
7bc570c8 YH |
1443 | write_unlock_bh(&mrt_lock); |
1444 | ||
1445 | /* | |
1446 | * Check to see if we resolved a queued list. If so we | |
1447 | * need to send on the frames and tidy up. | |
1448 | */ | |
f30a7784 | 1449 | found = false; |
7bc570c8 | 1450 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1451 | list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) { |
c476efbc | 1452 | if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && |
7bc570c8 | 1453 | ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { |
f30a7784 | 1454 | list_del(&uc->list); |
6bd52143 | 1455 | atomic_dec(&mrt->cache_resolve_queue_len); |
f30a7784 | 1456 | found = true; |
7bc570c8 YH |
1457 | break; |
1458 | } | |
1459 | } | |
6bd52143 PM |
1460 | if (list_empty(&mrt->mfc6_unres_queue)) |
1461 | del_timer(&mrt->ipmr_expire_timer); | |
7bc570c8 YH |
1462 | spin_unlock_bh(&mfc_unres_lock); |
1463 | ||
f30a7784 | 1464 | if (found) { |
6bd52143 | 1465 | ip6mr_cache_resolve(net, mrt, uc, c); |
58701ad4 | 1466 | ip6mr_cache_free(uc); |
7bc570c8 YH |
1467 | } |
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * Close the multicast socket, and clear the vif tables etc | |
1473 | */ | |
1474 | ||
6bd52143 | 1475 | static void mroute_clean_tables(struct mr6_table *mrt) |
7bc570c8 YH |
1476 | { |
1477 | int i; | |
c871e664 | 1478 | LIST_HEAD(list); |
f30a7784 | 1479 | struct mfc6_cache *c, *next; |
7bc570c8 YH |
1480 | |
1481 | /* | |
1482 | * Shut down all active vif entries | |
1483 | */ | |
6bd52143 PM |
1484 | for (i = 0; i < mrt->maxvif; i++) { |
1485 | if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) | |
1486 | mif6_delete(mrt, i, &list); | |
7bc570c8 | 1487 | } |
c871e664 | 1488 | unregister_netdevice_many(&list); |
7bc570c8 YH |
1489 | |
1490 | /* | |
1491 | * Wipe the cache | |
1492 | */ | |
4a6258a0 | 1493 | for (i = 0; i < MFC6_LINES; i++) { |
6bd52143 | 1494 | list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { |
f30a7784 | 1495 | if (c->mfc_flags & MFC_STATIC) |
7bc570c8 | 1496 | continue; |
7bc570c8 | 1497 | write_lock_bh(&mrt_lock); |
f30a7784 | 1498 | list_del(&c->list); |
7bc570c8 YH |
1499 | write_unlock_bh(&mrt_lock); |
1500 | ||
58701ad4 | 1501 | ip6mr_cache_free(c); |
7bc570c8 YH |
1502 | } |
1503 | } | |
1504 | ||
6bd52143 | 1505 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
7bc570c8 | 1506 | spin_lock_bh(&mfc_unres_lock); |
6bd52143 | 1507 | list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { |
f30a7784 | 1508 | list_del(&c->list); |
6bd52143 | 1509 | ip6mr_destroy_unres(mrt, c); |
7bc570c8 YH |
1510 | } |
1511 | spin_unlock_bh(&mfc_unres_lock); | |
1512 | } | |
1513 | } | |
1514 | ||
6bd52143 | 1515 | static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk) |
7bc570c8 YH |
1516 | { |
1517 | int err = 0; | |
8229efda | 1518 | struct net *net = sock_net(sk); |
7bc570c8 YH |
1519 | |
1520 | rtnl_lock(); | |
1521 | write_lock_bh(&mrt_lock); | |
6bd52143 PM |
1522 | if (likely(mrt->mroute6_sk == NULL)) { |
1523 | mrt->mroute6_sk = sk; | |
1d6e55f1 | 1524 | net->ipv6.devconf_all->mc_forwarding++; |
d67b8c61 ND |
1525 | inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1526 | NETCONFA_IFINDEX_ALL, | |
1527 | net->ipv6.devconf_all); | |
1d6e55f1 | 1528 | } |
7bc570c8 YH |
1529 | else |
1530 | err = -EADDRINUSE; | |
1531 | write_unlock_bh(&mrt_lock); | |
1532 | ||
1533 | rtnl_unlock(); | |
1534 | ||
1535 | return err; | |
1536 | } | |
1537 | ||
1538 | int ip6mr_sk_done(struct sock *sk) | |
1539 | { | |
d1db275d | 1540 | int err = -EACCES; |
8229efda | 1541 | struct net *net = sock_net(sk); |
d1db275d | 1542 | struct mr6_table *mrt; |
7bc570c8 YH |
1543 | |
1544 | rtnl_lock(); | |
d1db275d PM |
1545 | ip6mr_for_each_table(mrt, net) { |
1546 | if (sk == mrt->mroute6_sk) { | |
1547 | write_lock_bh(&mrt_lock); | |
1548 | mrt->mroute6_sk = NULL; | |
1549 | net->ipv6.devconf_all->mc_forwarding--; | |
d67b8c61 ND |
1550 | inet6_netconf_notify_devconf(net, |
1551 | NETCONFA_MC_FORWARDING, | |
1552 | NETCONFA_IFINDEX_ALL, | |
1553 | net->ipv6.devconf_all); | |
d1db275d | 1554 | write_unlock_bh(&mrt_lock); |
7bc570c8 | 1555 | |
d1db275d PM |
1556 | mroute_clean_tables(mrt); |
1557 | err = 0; | |
1558 | break; | |
1559 | } | |
1560 | } | |
7bc570c8 YH |
1561 | rtnl_unlock(); |
1562 | ||
1563 | return err; | |
1564 | } | |
1565 | ||
d1db275d | 1566 | struct sock *mroute6_socket(struct net *net, struct sk_buff *skb) |
6bd52143 | 1567 | { |
d1db275d | 1568 | struct mr6_table *mrt; |
4c9483b2 DM |
1569 | struct flowi6 fl6 = { |
1570 | .flowi6_iif = skb->skb_iif, | |
1571 | .flowi6_oif = skb->dev->ifindex, | |
1572 | .flowi6_mark = skb->mark, | |
d1db275d PM |
1573 | }; |
1574 | ||
4c9483b2 | 1575 | if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) |
d1db275d | 1576 | return NULL; |
6bd52143 PM |
1577 | |
1578 | return mrt->mroute6_sk; | |
1579 | } | |
1580 | ||
7bc570c8 YH |
1581 | /* |
1582 | * Socket options and virtual interface manipulation. The whole | |
1583 | * virtual interface system is a complete heap, but unfortunately | |
1584 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1585 | * MOSPF/PIM router set up we can clean this up. | |
1586 | */ | |
1587 | ||
b7058842 | 1588 | int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
7bc570c8 YH |
1589 | { |
1590 | int ret; | |
1591 | struct mif6ctl vif; | |
1592 | struct mf6cctl mfc; | |
1593 | mifi_t mifi; | |
8229efda | 1594 | struct net *net = sock_net(sk); |
d1db275d PM |
1595 | struct mr6_table *mrt; |
1596 | ||
1597 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1598 | if (mrt == NULL) | |
1599 | return -ENOENT; | |
7bc570c8 YH |
1600 | |
1601 | if (optname != MRT6_INIT) { | |
af31f412 | 1602 | if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
7bc570c8 YH |
1603 | return -EACCES; |
1604 | } | |
1605 | ||
1606 | switch (optname) { | |
1607 | case MRT6_INIT: | |
1608 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1609 | inet_sk(sk)->inet_num != IPPROTO_ICMPV6) |
7bc570c8 YH |
1610 | return -EOPNOTSUPP; |
1611 | if (optlen < sizeof(int)) | |
1612 | return -EINVAL; | |
1613 | ||
6bd52143 | 1614 | return ip6mr_sk_init(mrt, sk); |
7bc570c8 YH |
1615 | |
1616 | case MRT6_DONE: | |
1617 | return ip6mr_sk_done(sk); | |
1618 | ||
1619 | case MRT6_ADD_MIF: | |
1620 | if (optlen < sizeof(vif)) | |
1621 | return -EINVAL; | |
1622 | if (copy_from_user(&vif, optval, sizeof(vif))) | |
1623 | return -EFAULT; | |
6ac7eb08 | 1624 | if (vif.mif6c_mifi >= MAXMIFS) |
7bc570c8 YH |
1625 | return -ENFILE; |
1626 | rtnl_lock(); | |
6bd52143 | 1627 | ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1628 | rtnl_unlock(); |
1629 | return ret; | |
1630 | ||
1631 | case MRT6_DEL_MIF: | |
1632 | if (optlen < sizeof(mifi_t)) | |
1633 | return -EINVAL; | |
1634 | if (copy_from_user(&mifi, optval, sizeof(mifi_t))) | |
1635 | return -EFAULT; | |
1636 | rtnl_lock(); | |
6bd52143 | 1637 | ret = mif6_delete(mrt, mifi, NULL); |
7bc570c8 YH |
1638 | rtnl_unlock(); |
1639 | return ret; | |
1640 | ||
1641 | /* | |
1642 | * Manipulate the forwarding caches. These live | |
1643 | * in a sort of kernel/user symbiosis. | |
1644 | */ | |
1645 | case MRT6_ADD_MFC: | |
1646 | case MRT6_DEL_MFC: | |
1647 | if (optlen < sizeof(mfc)) | |
1648 | return -EINVAL; | |
1649 | if (copy_from_user(&mfc, optval, sizeof(mfc))) | |
1650 | return -EFAULT; | |
1651 | rtnl_lock(); | |
1652 | if (optname == MRT6_DEL_MFC) | |
6bd52143 | 1653 | ret = ip6mr_mfc_delete(mrt, &mfc); |
7bc570c8 | 1654 | else |
6bd52143 | 1655 | ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk); |
7bc570c8 YH |
1656 | rtnl_unlock(); |
1657 | return ret; | |
1658 | ||
14fb64e1 YH |
1659 | /* |
1660 | * Control PIM assert (to activate pim will activate assert) | |
1661 | */ | |
1662 | case MRT6_ASSERT: | |
1663 | { | |
1664 | int v; | |
03f52a0a JP |
1665 | |
1666 | if (optlen != sizeof(v)) | |
1667 | return -EINVAL; | |
14fb64e1 YH |
1668 | if (get_user(v, (int __user *)optval)) |
1669 | return -EFAULT; | |
53d6841d | 1670 | mrt->mroute_do_assert = v; |
14fb64e1 YH |
1671 | return 0; |
1672 | } | |
1673 | ||
1674 | #ifdef CONFIG_IPV6_PIMSM_V2 | |
1675 | case MRT6_PIM: | |
1676 | { | |
a9f83bf3 | 1677 | int v; |
03f52a0a JP |
1678 | |
1679 | if (optlen != sizeof(v)) | |
1680 | return -EINVAL; | |
14fb64e1 YH |
1681 | if (get_user(v, (int __user *)optval)) |
1682 | return -EFAULT; | |
1683 | v = !!v; | |
1684 | rtnl_lock(); | |
1685 | ret = 0; | |
6bd52143 PM |
1686 | if (v != mrt->mroute_do_pim) { |
1687 | mrt->mroute_do_pim = v; | |
1688 | mrt->mroute_do_assert = v; | |
14fb64e1 YH |
1689 | } |
1690 | rtnl_unlock(); | |
1691 | return ret; | |
1692 | } | |
1693 | ||
d1db275d PM |
1694 | #endif |
1695 | #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES | |
1696 | case MRT6_TABLE: | |
1697 | { | |
1698 | u32 v; | |
1699 | ||
1700 | if (optlen != sizeof(u32)) | |
1701 | return -EINVAL; | |
1702 | if (get_user(v, (u32 __user *)optval)) | |
1703 | return -EFAULT; | |
1704 | if (sk == mrt->mroute6_sk) | |
1705 | return -EBUSY; | |
1706 | ||
1707 | rtnl_lock(); | |
1708 | ret = 0; | |
1709 | if (!ip6mr_new_table(net, v)) | |
1710 | ret = -ENOMEM; | |
1711 | raw6_sk(sk)->ip6mr_table = v; | |
1712 | rtnl_unlock(); | |
1713 | return ret; | |
1714 | } | |
14fb64e1 | 1715 | #endif |
7bc570c8 | 1716 | /* |
7d120c55 | 1717 | * Spurious command, or MRT6_VERSION which you cannot |
7bc570c8 YH |
1718 | * set. |
1719 | */ | |
1720 | default: | |
1721 | return -ENOPROTOOPT; | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | /* | |
1726 | * Getsock opt support for the multicast routing system. | |
1727 | */ | |
1728 | ||
1729 | int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, | |
1730 | int __user *optlen) | |
1731 | { | |
1732 | int olr; | |
1733 | int val; | |
8229efda | 1734 | struct net *net = sock_net(sk); |
d1db275d PM |
1735 | struct mr6_table *mrt; |
1736 | ||
1737 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1738 | if (mrt == NULL) | |
1739 | return -ENOENT; | |
7bc570c8 YH |
1740 | |
1741 | switch (optname) { | |
1742 | case MRT6_VERSION: | |
1743 | val = 0x0305; | |
1744 | break; | |
14fb64e1 YH |
1745 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1746 | case MRT6_PIM: | |
6bd52143 | 1747 | val = mrt->mroute_do_pim; |
14fb64e1 YH |
1748 | break; |
1749 | #endif | |
1750 | case MRT6_ASSERT: | |
6bd52143 | 1751 | val = mrt->mroute_do_assert; |
14fb64e1 | 1752 | break; |
7bc570c8 YH |
1753 | default: |
1754 | return -ENOPROTOOPT; | |
1755 | } | |
1756 | ||
1757 | if (get_user(olr, optlen)) | |
1758 | return -EFAULT; | |
1759 | ||
1760 | olr = min_t(int, olr, sizeof(int)); | |
1761 | if (olr < 0) | |
1762 | return -EINVAL; | |
1763 | ||
1764 | if (put_user(olr, optlen)) | |
1765 | return -EFAULT; | |
1766 | if (copy_to_user(optval, &val, olr)) | |
1767 | return -EFAULT; | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | /* | |
1772 | * The IP multicast ioctl support routines. | |
1773 | */ | |
1774 | ||
1775 | int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) | |
1776 | { | |
1777 | struct sioc_sg_req6 sr; | |
1778 | struct sioc_mif_req6 vr; | |
1779 | struct mif_device *vif; | |
1780 | struct mfc6_cache *c; | |
8229efda | 1781 | struct net *net = sock_net(sk); |
d1db275d PM |
1782 | struct mr6_table *mrt; |
1783 | ||
1784 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1785 | if (mrt == NULL) | |
1786 | return -ENOENT; | |
7bc570c8 YH |
1787 | |
1788 | switch (cmd) { | |
1789 | case SIOCGETMIFCNT_IN6: | |
1790 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1791 | return -EFAULT; | |
6bd52143 | 1792 | if (vr.mifi >= mrt->maxvif) |
7bc570c8 YH |
1793 | return -EINVAL; |
1794 | read_lock(&mrt_lock); | |
6bd52143 PM |
1795 | vif = &mrt->vif6_table[vr.mifi]; |
1796 | if (MIF_EXISTS(mrt, vr.mifi)) { | |
7bc570c8 YH |
1797 | vr.icount = vif->pkt_in; |
1798 | vr.ocount = vif->pkt_out; | |
1799 | vr.ibytes = vif->bytes_in; | |
1800 | vr.obytes = vif->bytes_out; | |
1801 | read_unlock(&mrt_lock); | |
1802 | ||
1803 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1804 | return -EFAULT; | |
1805 | return 0; | |
1806 | } | |
1807 | read_unlock(&mrt_lock); | |
1808 | return -EADDRNOTAVAIL; | |
1809 | case SIOCGETSGCNT_IN6: | |
1810 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1811 | return -EFAULT; | |
1812 | ||
1813 | read_lock(&mrt_lock); | |
6bd52143 | 1814 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); |
7bc570c8 YH |
1815 | if (c) { |
1816 | sr.pktcnt = c->mfc_un.res.pkt; | |
1817 | sr.bytecnt = c->mfc_un.res.bytes; | |
1818 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1819 | read_unlock(&mrt_lock); | |
1820 | ||
1821 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1822 | return -EFAULT; | |
1823 | return 0; | |
1824 | } | |
1825 | read_unlock(&mrt_lock); | |
1826 | return -EADDRNOTAVAIL; | |
1827 | default: | |
1828 | return -ENOIOCTLCMD; | |
1829 | } | |
1830 | } | |
1831 | ||
e2d57766 DM |
1832 | #ifdef CONFIG_COMPAT |
1833 | struct compat_sioc_sg_req6 { | |
1834 | struct sockaddr_in6 src; | |
1835 | struct sockaddr_in6 grp; | |
1836 | compat_ulong_t pktcnt; | |
1837 | compat_ulong_t bytecnt; | |
1838 | compat_ulong_t wrong_if; | |
1839 | }; | |
1840 | ||
1841 | struct compat_sioc_mif_req6 { | |
1842 | mifi_t mifi; | |
1843 | compat_ulong_t icount; | |
1844 | compat_ulong_t ocount; | |
1845 | compat_ulong_t ibytes; | |
1846 | compat_ulong_t obytes; | |
1847 | }; | |
1848 | ||
1849 | int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) | |
1850 | { | |
1851 | struct compat_sioc_sg_req6 sr; | |
1852 | struct compat_sioc_mif_req6 vr; | |
1853 | struct mif_device *vif; | |
1854 | struct mfc6_cache *c; | |
1855 | struct net *net = sock_net(sk); | |
1856 | struct mr6_table *mrt; | |
1857 | ||
1858 | mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); | |
1859 | if (mrt == NULL) | |
1860 | return -ENOENT; | |
1861 | ||
1862 | switch (cmd) { | |
1863 | case SIOCGETMIFCNT_IN6: | |
1864 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1865 | return -EFAULT; | |
1866 | if (vr.mifi >= mrt->maxvif) | |
1867 | return -EINVAL; | |
1868 | read_lock(&mrt_lock); | |
1869 | vif = &mrt->vif6_table[vr.mifi]; | |
1870 | if (MIF_EXISTS(mrt, vr.mifi)) { | |
1871 | vr.icount = vif->pkt_in; | |
1872 | vr.ocount = vif->pkt_out; | |
1873 | vr.ibytes = vif->bytes_in; | |
1874 | vr.obytes = vif->bytes_out; | |
1875 | read_unlock(&mrt_lock); | |
1876 | ||
1877 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1878 | return -EFAULT; | |
1879 | return 0; | |
1880 | } | |
1881 | read_unlock(&mrt_lock); | |
1882 | return -EADDRNOTAVAIL; | |
1883 | case SIOCGETSGCNT_IN6: | |
1884 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1885 | return -EFAULT; | |
1886 | ||
1887 | read_lock(&mrt_lock); | |
1888 | c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); | |
1889 | if (c) { | |
1890 | sr.pktcnt = c->mfc_un.res.pkt; | |
1891 | sr.bytecnt = c->mfc_un.res.bytes; | |
1892 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1893 | read_unlock(&mrt_lock); | |
1894 | ||
1895 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1896 | return -EFAULT; | |
1897 | return 0; | |
1898 | } | |
1899 | read_unlock(&mrt_lock); | |
1900 | return -EADDRNOTAVAIL; | |
1901 | default: | |
1902 | return -ENOIOCTLCMD; | |
1903 | } | |
1904 | } | |
1905 | #endif | |
7bc570c8 YH |
1906 | |
1907 | static inline int ip6mr_forward2_finish(struct sk_buff *skb) | |
1908 | { | |
adf30907 | 1909 | IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
483a47d2 | 1910 | IPSTATS_MIB_OUTFORWDATAGRAMS); |
2d8dbb04 VB |
1911 | IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), |
1912 | IPSTATS_MIB_OUTOCTETS, skb->len); | |
7bc570c8 YH |
1913 | return dst_output(skb); |
1914 | } | |
1915 | ||
1916 | /* | |
1917 | * Processing handlers for ip6mr_forward | |
1918 | */ | |
1919 | ||
6bd52143 PM |
1920 | static int ip6mr_forward2(struct net *net, struct mr6_table *mrt, |
1921 | struct sk_buff *skb, struct mfc6_cache *c, int vifi) | |
7bc570c8 YH |
1922 | { |
1923 | struct ipv6hdr *ipv6h; | |
6bd52143 | 1924 | struct mif_device *vif = &mrt->vif6_table[vifi]; |
7bc570c8 YH |
1925 | struct net_device *dev; |
1926 | struct dst_entry *dst; | |
4c9483b2 | 1927 | struct flowi6 fl6; |
7bc570c8 YH |
1928 | |
1929 | if (vif->dev == NULL) | |
1930 | goto out_free; | |
1931 | ||
14fb64e1 YH |
1932 | #ifdef CONFIG_IPV6_PIMSM_V2 |
1933 | if (vif->flags & MIFF_REGISTER) { | |
1934 | vif->pkt_out++; | |
1935 | vif->bytes_out += skb->len; | |
dc58c78c PE |
1936 | vif->dev->stats.tx_bytes += skb->len; |
1937 | vif->dev->stats.tx_packets++; | |
6bd52143 | 1938 | ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); |
8da73b73 | 1939 | goto out_free; |
14fb64e1 YH |
1940 | } |
1941 | #endif | |
1942 | ||
7bc570c8 YH |
1943 | ipv6h = ipv6_hdr(skb); |
1944 | ||
4c9483b2 DM |
1945 | fl6 = (struct flowi6) { |
1946 | .flowi6_oif = vif->link, | |
1947 | .daddr = ipv6h->daddr, | |
7bc570c8 YH |
1948 | }; |
1949 | ||
4c9483b2 | 1950 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1951 | if (dst->error) { |
1952 | dst_release(dst); | |
7bc570c8 | 1953 | goto out_free; |
5095d64d | 1954 | } |
7bc570c8 | 1955 | |
adf30907 ED |
1956 | skb_dst_drop(skb); |
1957 | skb_dst_set(skb, dst); | |
7bc570c8 YH |
1958 | |
1959 | /* | |
1960 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1961 | * not only before forwarding, but after forwarding on all output | |
1962 | * interfaces. It is clear, if mrouter runs a multicasting | |
1963 | * program, it should receive packets not depending to what interface | |
1964 | * program is joined. | |
1965 | * If we will not make it, the program will have to join on all | |
1966 | * interfaces. On the other hand, multihoming host (or router, but | |
1967 | * not mrouter) cannot join to more than one interface - it will | |
1968 | * result in receiving multiple packets. | |
1969 | */ | |
1970 | dev = vif->dev; | |
1971 | skb->dev = dev; | |
1972 | vif->pkt_out++; | |
1973 | vif->bytes_out += skb->len; | |
1974 | ||
1975 | /* We are about to write */ | |
1976 | /* XXX: extension headers? */ | |
1977 | if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) | |
1978 | goto out_free; | |
1979 | ||
1980 | ipv6h = ipv6_hdr(skb); | |
1981 | ipv6h->hop_limit--; | |
1982 | ||
1983 | IP6CB(skb)->flags |= IP6SKB_FORWARDED; | |
1984 | ||
b2e0b385 | 1985 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, |
7bc570c8 YH |
1986 | ip6mr_forward2_finish); |
1987 | ||
1988 | out_free: | |
1989 | kfree_skb(skb); | |
1990 | return 0; | |
1991 | } | |
1992 | ||
6bd52143 | 1993 | static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev) |
7bc570c8 YH |
1994 | { |
1995 | int ct; | |
6bd52143 PM |
1996 | |
1997 | for (ct = mrt->maxvif - 1; ct >= 0; ct--) { | |
1998 | if (mrt->vif6_table[ct].dev == dev) | |
7bc570c8 YH |
1999 | break; |
2000 | } | |
2001 | return ct; | |
2002 | } | |
2003 | ||
6bd52143 PM |
2004 | static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, |
2005 | struct sk_buff *skb, struct mfc6_cache *cache) | |
7bc570c8 YH |
2006 | { |
2007 | int psend = -1; | |
2008 | int vif, ct; | |
2009 | ||
2010 | vif = cache->mf6c_parent; | |
2011 | cache->mfc_un.res.pkt++; | |
2012 | cache->mfc_un.res.bytes += skb->len; | |
2013 | ||
14fb64e1 YH |
2014 | /* |
2015 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
2016 | */ | |
6bd52143 | 2017 | if (mrt->vif6_table[vif].dev != skb->dev) { |
14fb64e1 YH |
2018 | int true_vifi; |
2019 | ||
2020 | cache->mfc_un.res.wrong_if++; | |
6bd52143 | 2021 | true_vifi = ip6mr_find_vif(mrt, skb->dev); |
14fb64e1 | 2022 | |
6bd52143 | 2023 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
14fb64e1 YH |
2024 | /* pimsm uses asserts, when switching from RPT to SPT, |
2025 | so that we cannot check that packet arrived on an oif. | |
2026 | It is bad, but otherwise we would need to move pretty | |
2027 | large chunk of pimd to kernel. Ough... --ANK | |
2028 | */ | |
6bd52143 | 2029 | (mrt->mroute_do_pim || |
a21f3f99 | 2030 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
14fb64e1 YH |
2031 | time_after(jiffies, |
2032 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { | |
2033 | cache->mfc_un.res.last_assert = jiffies; | |
6bd52143 | 2034 | ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); |
14fb64e1 YH |
2035 | } |
2036 | goto dont_forward; | |
2037 | } | |
2038 | ||
6bd52143 PM |
2039 | mrt->vif6_table[vif].pkt_in++; |
2040 | mrt->vif6_table[vif].bytes_in += skb->len; | |
7bc570c8 YH |
2041 | |
2042 | /* | |
2043 | * Forward the frame | |
2044 | */ | |
2045 | for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { | |
2046 | if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { | |
2047 | if (psend != -1) { | |
2048 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2049 | if (skb2) | |
6bd52143 | 2050 | ip6mr_forward2(net, mrt, skb2, cache, psend); |
7bc570c8 YH |
2051 | } |
2052 | psend = ct; | |
2053 | } | |
2054 | } | |
2055 | if (psend != -1) { | |
6bd52143 | 2056 | ip6mr_forward2(net, mrt, skb, cache, psend); |
7bc570c8 YH |
2057 | return 0; |
2058 | } | |
2059 | ||
14fb64e1 | 2060 | dont_forward: |
7bc570c8 YH |
2061 | kfree_skb(skb); |
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | ||
2066 | /* | |
2067 | * Multicast packets for forwarding arrive here | |
2068 | */ | |
2069 | ||
2070 | int ip6_mr_input(struct sk_buff *skb) | |
2071 | { | |
2072 | struct mfc6_cache *cache; | |
8229efda | 2073 | struct net *net = dev_net(skb->dev); |
d1db275d | 2074 | struct mr6_table *mrt; |
4c9483b2 DM |
2075 | struct flowi6 fl6 = { |
2076 | .flowi6_iif = skb->dev->ifindex, | |
2077 | .flowi6_mark = skb->mark, | |
d1db275d PM |
2078 | }; |
2079 | int err; | |
2080 | ||
4c9483b2 | 2081 | err = ip6mr_fib_lookup(net, &fl6, &mrt); |
2015de5f BG |
2082 | if (err < 0) { |
2083 | kfree_skb(skb); | |
d1db275d | 2084 | return err; |
2015de5f | 2085 | } |
7bc570c8 YH |
2086 | |
2087 | read_lock(&mrt_lock); | |
6bd52143 | 2088 | cache = ip6mr_cache_find(mrt, |
8229efda | 2089 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); |
7bc570c8 YH |
2090 | |
2091 | /* | |
2092 | * No usable cache entry | |
2093 | */ | |
2094 | if (cache == NULL) { | |
2095 | int vif; | |
2096 | ||
6bd52143 | 2097 | vif = ip6mr_find_vif(mrt, skb->dev); |
7bc570c8 | 2098 | if (vif >= 0) { |
6bd52143 | 2099 | int err = ip6mr_cache_unresolved(mrt, vif, skb); |
7bc570c8 YH |
2100 | read_unlock(&mrt_lock); |
2101 | ||
2102 | return err; | |
2103 | } | |
2104 | read_unlock(&mrt_lock); | |
2105 | kfree_skb(skb); | |
2106 | return -ENODEV; | |
2107 | } | |
2108 | ||
6bd52143 | 2109 | ip6_mr_forward(net, mrt, skb, cache); |
7bc570c8 YH |
2110 | |
2111 | read_unlock(&mrt_lock); | |
2112 | ||
2113 | return 0; | |
2114 | } | |
2115 | ||
2116 | ||
5b285cac PM |
2117 | static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
2118 | struct mfc6_cache *c, struct rtmsg *rtm) | |
7bc570c8 YH |
2119 | { |
2120 | int ct; | |
2121 | struct rtnexthop *nhp; | |
70b386a0 | 2122 | struct nlattr *mp_attr; |
adfa85e4 | 2123 | struct rta_mfc_stats mfcs; |
7bc570c8 | 2124 | |
7438189b | 2125 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2126 | if (c->mf6c_parent >= MAXMIFS) |
7438189b ND |
2127 | return -ENOENT; |
2128 | ||
74a0bd7d TG |
2129 | if (MIF_EXISTS(mrt, c->mf6c_parent) && |
2130 | nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0) | |
2131 | return -EMSGSIZE; | |
70b386a0 ND |
2132 | mp_attr = nla_nest_start(skb, RTA_MULTIPATH); |
2133 | if (mp_attr == NULL) | |
2134 | return -EMSGSIZE; | |
7bc570c8 YH |
2135 | |
2136 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
6bd52143 | 2137 | if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
70b386a0 ND |
2138 | nhp = nla_reserve_nohdr(skb, sizeof(*nhp)); |
2139 | if (nhp == NULL) { | |
2140 | nla_nest_cancel(skb, mp_attr); | |
2141 | return -EMSGSIZE; | |
2142 | } | |
2143 | ||
7bc570c8 YH |
2144 | nhp->rtnh_flags = 0; |
2145 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
6bd52143 | 2146 | nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex; |
7bc570c8 YH |
2147 | nhp->rtnh_len = sizeof(*nhp); |
2148 | } | |
2149 | } | |
70b386a0 ND |
2150 | |
2151 | nla_nest_end(skb, mp_attr); | |
2152 | ||
adfa85e4 ND |
2153 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2154 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2155 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
2156 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) | |
2157 | return -EMSGSIZE; | |
2158 | ||
7bc570c8 YH |
2159 | rtm->rtm_type = RTN_MULTICAST; |
2160 | return 1; | |
7bc570c8 YH |
2161 | } |
2162 | ||
8229efda BT |
2163 | int ip6mr_get_route(struct net *net, |
2164 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
7bc570c8 YH |
2165 | { |
2166 | int err; | |
d1db275d | 2167 | struct mr6_table *mrt; |
7bc570c8 | 2168 | struct mfc6_cache *cache; |
adf30907 | 2169 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
7bc570c8 | 2170 | |
d1db275d PM |
2171 | mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); |
2172 | if (mrt == NULL) | |
2173 | return -ENOENT; | |
2174 | ||
7bc570c8 | 2175 | read_lock(&mrt_lock); |
6bd52143 | 2176 | cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); |
7bc570c8 YH |
2177 | |
2178 | if (!cache) { | |
2179 | struct sk_buff *skb2; | |
2180 | struct ipv6hdr *iph; | |
2181 | struct net_device *dev; | |
2182 | int vif; | |
2183 | ||
2184 | if (nowait) { | |
2185 | read_unlock(&mrt_lock); | |
2186 | return -EAGAIN; | |
2187 | } | |
2188 | ||
2189 | dev = skb->dev; | |
6bd52143 | 2190 | if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) { |
7bc570c8 YH |
2191 | read_unlock(&mrt_lock); |
2192 | return -ENODEV; | |
2193 | } | |
2194 | ||
2195 | /* really correct? */ | |
2196 | skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
2197 | if (!skb2) { | |
2198 | read_unlock(&mrt_lock); | |
2199 | return -ENOMEM; | |
2200 | } | |
2201 | ||
2202 | skb_reset_transport_header(skb2); | |
2203 | ||
2204 | skb_put(skb2, sizeof(struct ipv6hdr)); | |
2205 | skb_reset_network_header(skb2); | |
2206 | ||
2207 | iph = ipv6_hdr(skb2); | |
2208 | iph->version = 0; | |
2209 | iph->priority = 0; | |
2210 | iph->flow_lbl[0] = 0; | |
2211 | iph->flow_lbl[1] = 0; | |
2212 | iph->flow_lbl[2] = 0; | |
2213 | iph->payload_len = 0; | |
2214 | iph->nexthdr = IPPROTO_NONE; | |
2215 | iph->hop_limit = 0; | |
4e3fd7a0 AD |
2216 | iph->saddr = rt->rt6i_src.addr; |
2217 | iph->daddr = rt->rt6i_dst.addr; | |
7bc570c8 | 2218 | |
6bd52143 | 2219 | err = ip6mr_cache_unresolved(mrt, vif, skb2); |
7bc570c8 YH |
2220 | read_unlock(&mrt_lock); |
2221 | ||
2222 | return err; | |
2223 | } | |
2224 | ||
2225 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
2226 | cache->mfc_flags |= MFC_NOTIFY; | |
2227 | ||
5b285cac | 2228 | err = __ip6mr_fill_mroute(mrt, skb, cache, rtm); |
7bc570c8 YH |
2229 | read_unlock(&mrt_lock); |
2230 | return err; | |
2231 | } | |
2232 | ||
5b285cac | 2233 | static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, |
15e47304 | 2234 | u32 portid, u32 seq, struct mfc6_cache *c) |
5b285cac PM |
2235 | { |
2236 | struct nlmsghdr *nlh; | |
2237 | struct rtmsg *rtm; | |
2238 | ||
15e47304 | 2239 | nlh = nlmsg_put(skb, portid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); |
5b285cac PM |
2240 | if (nlh == NULL) |
2241 | return -EMSGSIZE; | |
2242 | ||
2243 | rtm = nlmsg_data(nlh); | |
2244 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2245 | rtm->rtm_dst_len = 128; | |
2246 | rtm->rtm_src_len = 128; | |
2247 | rtm->rtm_tos = 0; | |
2248 | rtm->rtm_table = mrt->id; | |
c78679e8 DM |
2249 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2250 | goto nla_put_failure; | |
5b285cac | 2251 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
9a68ac72 ND |
2252 | if (c->mfc_flags & MFC_STATIC) |
2253 | rtm->rtm_protocol = RTPROT_STATIC; | |
2254 | else | |
2255 | rtm->rtm_protocol = RTPROT_MROUTED; | |
5b285cac PM |
2256 | rtm->rtm_flags = 0; |
2257 | ||
c78679e8 DM |
2258 | if (nla_put(skb, RTA_SRC, 16, &c->mf6c_origin) || |
2259 | nla_put(skb, RTA_DST, 16, &c->mf6c_mcastgrp)) | |
2260 | goto nla_put_failure; | |
5b285cac PM |
2261 | if (__ip6mr_fill_mroute(mrt, skb, c, rtm) < 0) |
2262 | goto nla_put_failure; | |
2263 | ||
2264 | return nlmsg_end(skb, nlh); | |
2265 | ||
2266 | nla_put_failure: | |
2267 | nlmsg_cancel(skb, nlh); | |
2268 | return -EMSGSIZE; | |
2269 | } | |
2270 | ||
2271 | static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) | |
2272 | { | |
2273 | struct net *net = sock_net(skb->sk); | |
2274 | struct mr6_table *mrt; | |
2275 | struct mfc6_cache *mfc; | |
2276 | unsigned int t = 0, s_t; | |
2277 | unsigned int h = 0, s_h; | |
2278 | unsigned int e = 0, s_e; | |
2279 | ||
2280 | s_t = cb->args[0]; | |
2281 | s_h = cb->args[1]; | |
2282 | s_e = cb->args[2]; | |
2283 | ||
2284 | read_lock(&mrt_lock); | |
2285 | ip6mr_for_each_table(mrt, net) { | |
2286 | if (t < s_t) | |
2287 | goto next_table; | |
2288 | if (t > s_t) | |
2289 | s_h = 0; | |
2290 | for (h = s_h; h < MFC6_LINES; h++) { | |
2291 | list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) { | |
2292 | if (e < s_e) | |
2293 | goto next_entry; | |
2294 | if (ip6mr_fill_mroute(mrt, skb, | |
15e47304 | 2295 | NETLINK_CB(cb->skb).portid, |
5b285cac PM |
2296 | cb->nlh->nlmsg_seq, |
2297 | mfc) < 0) | |
2298 | goto done; | |
2299 | next_entry: | |
2300 | e++; | |
2301 | } | |
2302 | e = s_e = 0; | |
2303 | } | |
2304 | s_h = 0; | |
2305 | next_table: | |
2306 | t++; | |
2307 | } | |
2308 | done: | |
2309 | read_unlock(&mrt_lock); | |
2310 | ||
2311 | cb->args[2] = e; | |
2312 | cb->args[1] = h; | |
2313 | cb->args[0] = t; | |
2314 | ||
2315 | return skb->len; | |
2316 | } |