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