Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP multicast routing support for mrouted 3.6/3.8 | |
3 | * | |
113aa838 | 4 | * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * Linux Consultancy and Custom Driver Development |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
1da177e4 LT |
12 | * Fixes: |
13 | * Michael Chastain : Incorrect size of copying. | |
14 | * Alan Cox : Added the cache manager code | |
15 | * Alan Cox : Fixed the clone/copy bug and device race. | |
16 | * Mike McLagan : Routing by source | |
17 | * Malcolm Beattie : Buffer handling fixes. | |
18 | * Alexey Kuznetsov : Double buffer free and other fixes. | |
19 | * SVR Anand : Fixed several multicast bugs and problems. | |
20 | * Alexey Kuznetsov : Status, optimisations and more. | |
21 | * Brad Parker : Better behaviour on mrouted upcall | |
22 | * overflow. | |
23 | * Carlos Picoto : PIMv1 Support | |
24 | * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header | |
25 | * Relax this requrement to work with older peers. | |
26 | * | |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <asm/system.h> |
30 | #include <asm/uaccess.h> | |
31 | #include <linux/types.h> | |
4fc268d2 | 32 | #include <linux/capability.h> |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/timer.h> | |
35 | #include <linux/mm.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <linux/fcntl.h> | |
38 | #include <linux/stat.h> | |
39 | #include <linux/socket.h> | |
40 | #include <linux/in.h> | |
41 | #include <linux/inet.h> | |
42 | #include <linux/netdevice.h> | |
43 | #include <linux/inetdevice.h> | |
44 | #include <linux/igmp.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/seq_file.h> | |
47 | #include <linux/mroute.h> | |
48 | #include <linux/init.h> | |
46f25dff | 49 | #include <linux/if_ether.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
457c4cbc | 51 | #include <net/net_namespace.h> |
1da177e4 LT |
52 | #include <net/ip.h> |
53 | #include <net/protocol.h> | |
54 | #include <linux/skbuff.h> | |
14c85021 | 55 | #include <net/route.h> |
1da177e4 LT |
56 | #include <net/sock.h> |
57 | #include <net/icmp.h> | |
58 | #include <net/udp.h> | |
59 | #include <net/raw.h> | |
60 | #include <linux/notifier.h> | |
61 | #include <linux/if_arp.h> | |
62 | #include <linux/netfilter_ipv4.h> | |
63 | #include <net/ipip.h> | |
64 | #include <net/checksum.h> | |
dc5fc579 | 65 | #include <net/netlink.h> |
f0ad0860 | 66 | #include <net/fib_rules.h> |
1da177e4 LT |
67 | |
68 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
69 | #define CONFIG_IP_PIMSM 1 | |
70 | #endif | |
71 | ||
0c12295a | 72 | struct mr_table { |
f0ad0860 | 73 | struct list_head list; |
8de53dfb PM |
74 | #ifdef CONFIG_NET_NS |
75 | struct net *net; | |
76 | #endif | |
f0ad0860 | 77 | u32 id; |
0c12295a PM |
78 | struct sock *mroute_sk; |
79 | struct timer_list ipmr_expire_timer; | |
80 | struct list_head mfc_unres_queue; | |
81 | struct list_head mfc_cache_array[MFC_LINES]; | |
82 | struct vif_device vif_table[MAXVIFS]; | |
83 | int maxvif; | |
84 | atomic_t cache_resolve_queue_len; | |
85 | int mroute_do_assert; | |
86 | int mroute_do_pim; | |
87 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
88 | int mroute_reg_vif_num; | |
89 | #endif | |
90 | }; | |
91 | ||
f0ad0860 PM |
92 | struct ipmr_rule { |
93 | struct fib_rule common; | |
94 | }; | |
95 | ||
96 | struct ipmr_result { | |
97 | struct mr_table *mrt; | |
98 | }; | |
99 | ||
1da177e4 LT |
100 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
101 | Note that the changes are semaphored via rtnl_lock. | |
102 | */ | |
103 | ||
104 | static DEFINE_RWLOCK(mrt_lock); | |
105 | ||
106 | /* | |
107 | * Multicast router control variables | |
108 | */ | |
109 | ||
0c12295a | 110 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 | 111 | |
1da177e4 LT |
112 | /* Special spinlock for queue of unresolved entries */ |
113 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
114 | ||
115 | /* We return to original Alan's scheme. Hash table of resolved | |
116 | entries is changed only in process context and protected | |
117 | with weak lock mrt_lock. Queue of unresolved entries is protected | |
118 | with strong spinlock mfc_unres_lock. | |
119 | ||
120 | In this case data path is free of exclusive locks at all. | |
121 | */ | |
122 | ||
e18b890b | 123 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 124 | |
f0ad0860 | 125 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
0c12295a PM |
126 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
127 | struct sk_buff *skb, struct mfc_cache *cache, | |
128 | int local); | |
129 | static int ipmr_cache_report(struct mr_table *mrt, | |
4feb88e5 | 130 | struct sk_buff *pkt, vifi_t vifi, int assert); |
0c12295a | 131 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
d658f8a0 | 132 | struct mfc_cache *c, struct rtmsg *rtm); |
f0ad0860 PM |
133 | static void ipmr_expire_process(unsigned long arg); |
134 | ||
135 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
136 | #define ipmr_for_each_table(mrt, net) \ | |
137 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
138 | ||
139 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
140 | { | |
141 | struct mr_table *mrt; | |
142 | ||
143 | ipmr_for_each_table(mrt, net) { | |
144 | if (mrt->id == id) | |
145 | return mrt; | |
146 | } | |
147 | return NULL; | |
148 | } | |
149 | ||
150 | static int ipmr_fib_lookup(struct net *net, struct flowi *flp, | |
151 | struct mr_table **mrt) | |
152 | { | |
153 | struct ipmr_result res; | |
154 | struct fib_lookup_arg arg = { .result = &res, }; | |
155 | int err; | |
156 | ||
157 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, flp, 0, &arg); | |
158 | if (err < 0) | |
159 | return err; | |
160 | *mrt = res.mrt; | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
165 | int flags, struct fib_lookup_arg *arg) | |
166 | { | |
167 | struct ipmr_result *res = arg->result; | |
168 | struct mr_table *mrt; | |
169 | ||
170 | switch (rule->action) { | |
171 | case FR_ACT_TO_TBL: | |
172 | break; | |
173 | case FR_ACT_UNREACHABLE: | |
174 | return -ENETUNREACH; | |
175 | case FR_ACT_PROHIBIT: | |
176 | return -EACCES; | |
177 | case FR_ACT_BLACKHOLE: | |
178 | default: | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
183 | if (mrt == NULL) | |
184 | return -EAGAIN; | |
185 | res->mrt = mrt; | |
186 | return 0; | |
187 | } | |
188 | ||
189 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
190 | { | |
191 | return 1; | |
192 | } | |
193 | ||
194 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
195 | FRA_GENERIC_POLICY, | |
196 | }; | |
197 | ||
198 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
199 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
200 | { | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
205 | struct nlattr **tb) | |
206 | { | |
207 | return 1; | |
208 | } | |
209 | ||
210 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
211 | struct fib_rule_hdr *frh) | |
212 | { | |
213 | frh->dst_len = 0; | |
214 | frh->src_len = 0; | |
215 | frh->tos = 0; | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static struct fib_rules_ops ipmr_rules_ops_template = { | |
220 | .family = FIB_RULES_IPMR, | |
221 | .rule_size = sizeof(struct ipmr_rule), | |
222 | .addr_size = sizeof(u32), | |
223 | .action = ipmr_rule_action, | |
224 | .match = ipmr_rule_match, | |
225 | .configure = ipmr_rule_configure, | |
226 | .compare = ipmr_rule_compare, | |
227 | .default_pref = fib_default_rule_pref, | |
228 | .fill = ipmr_rule_fill, | |
229 | .nlgroup = RTNLGRP_IPV4_RULE, | |
230 | .policy = ipmr_rule_policy, | |
231 | .owner = THIS_MODULE, | |
232 | }; | |
233 | ||
234 | static int __net_init ipmr_rules_init(struct net *net) | |
235 | { | |
236 | struct fib_rules_ops *ops; | |
237 | struct mr_table *mrt; | |
238 | int err; | |
239 | ||
240 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
241 | if (IS_ERR(ops)) | |
242 | return PTR_ERR(ops); | |
243 | ||
244 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
245 | ||
246 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
247 | if (mrt == NULL) { | |
248 | err = -ENOMEM; | |
249 | goto err1; | |
250 | } | |
251 | ||
252 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
253 | if (err < 0) | |
254 | goto err2; | |
255 | ||
256 | net->ipv4.mr_rules_ops = ops; | |
257 | return 0; | |
258 | ||
259 | err2: | |
260 | kfree(mrt); | |
261 | err1: | |
262 | fib_rules_unregister(ops); | |
263 | return err; | |
264 | } | |
265 | ||
266 | static void __net_exit ipmr_rules_exit(struct net *net) | |
267 | { | |
268 | struct mr_table *mrt, *next; | |
269 | ||
270 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) | |
271 | kfree(mrt); | |
272 | fib_rules_unregister(net->ipv4.mr_rules_ops); | |
273 | } | |
274 | #else | |
275 | #define ipmr_for_each_table(mrt, net) \ | |
276 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
277 | ||
278 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
279 | { | |
280 | return net->ipv4.mrt; | |
281 | } | |
282 | ||
283 | static int ipmr_fib_lookup(struct net *net, struct flowi *flp, | |
284 | struct mr_table **mrt) | |
285 | { | |
286 | *mrt = net->ipv4.mrt; | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int __net_init ipmr_rules_init(struct net *net) | |
291 | { | |
292 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
293 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
294 | } | |
295 | ||
296 | static void __net_exit ipmr_rules_exit(struct net *net) | |
297 | { | |
298 | kfree(net->ipv4.mrt); | |
299 | } | |
300 | #endif | |
301 | ||
302 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
303 | { | |
304 | struct mr_table *mrt; | |
305 | unsigned int i; | |
306 | ||
307 | mrt = ipmr_get_table(net, id); | |
308 | if (mrt != NULL) | |
309 | return mrt; | |
310 | ||
311 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
312 | if (mrt == NULL) | |
313 | return NULL; | |
8de53dfb | 314 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
315 | mrt->id = id; |
316 | ||
317 | /* Forwarding cache */ | |
318 | for (i = 0; i < MFC_LINES; i++) | |
319 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
320 | ||
321 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
322 | ||
323 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
324 | (unsigned long)mrt); | |
325 | ||
326 | #ifdef CONFIG_IP_PIMSM | |
327 | mrt->mroute_reg_vif_num = -1; | |
328 | #endif | |
329 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
330 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
331 | #endif | |
332 | return mrt; | |
333 | } | |
1da177e4 | 334 | |
1da177e4 LT |
335 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
336 | ||
d607032d WC |
337 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
338 | { | |
4feb88e5 BT |
339 | struct net *net = dev_net(dev); |
340 | ||
d607032d WC |
341 | dev_close(dev); |
342 | ||
4feb88e5 | 343 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 344 | if (dev) { |
5bc3eb7e | 345 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 346 | struct ifreq ifr; |
d607032d WC |
347 | struct ip_tunnel_parm p; |
348 | ||
349 | memset(&p, 0, sizeof(p)); | |
350 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
351 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
352 | p.iph.version = 4; | |
353 | p.iph.ihl = 5; | |
354 | p.iph.protocol = IPPROTO_IPIP; | |
355 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
356 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
357 | ||
5bc3eb7e SH |
358 | if (ops->ndo_do_ioctl) { |
359 | mm_segment_t oldfs = get_fs(); | |
360 | ||
361 | set_fs(KERNEL_DS); | |
362 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
363 | set_fs(oldfs); | |
364 | } | |
d607032d WC |
365 | } |
366 | } | |
367 | ||
1da177e4 | 368 | static |
4feb88e5 | 369 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
370 | { |
371 | struct net_device *dev; | |
372 | ||
4feb88e5 | 373 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
374 | |
375 | if (dev) { | |
5bc3eb7e | 376 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
377 | int err; |
378 | struct ifreq ifr; | |
1da177e4 LT |
379 | struct ip_tunnel_parm p; |
380 | struct in_device *in_dev; | |
381 | ||
382 | memset(&p, 0, sizeof(p)); | |
383 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
384 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
385 | p.iph.version = 4; | |
386 | p.iph.ihl = 5; | |
387 | p.iph.protocol = IPPROTO_IPIP; | |
388 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 389 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 390 | |
5bc3eb7e SH |
391 | if (ops->ndo_do_ioctl) { |
392 | mm_segment_t oldfs = get_fs(); | |
393 | ||
394 | set_fs(KERNEL_DS); | |
395 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
396 | set_fs(oldfs); | |
397 | } else | |
398 | err = -EOPNOTSUPP; | |
1da177e4 LT |
399 | |
400 | dev = NULL; | |
401 | ||
4feb88e5 BT |
402 | if (err == 0 && |
403 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
404 | dev->flags |= IFF_MULTICAST; |
405 | ||
e5ed6399 | 406 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 407 | if (in_dev == NULL) |
1da177e4 | 408 | goto failure; |
71e27da9 HX |
409 | |
410 | ipv4_devconf_setall(in_dev); | |
411 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
412 | |
413 | if (dev_open(dev)) | |
414 | goto failure; | |
7dc00c82 | 415 | dev_hold(dev); |
1da177e4 LT |
416 | } |
417 | } | |
418 | return dev; | |
419 | ||
420 | failure: | |
421 | /* allow the register to be completed before unregistering. */ | |
422 | rtnl_unlock(); | |
423 | rtnl_lock(); | |
424 | ||
425 | unregister_netdevice(dev); | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | #ifdef CONFIG_IP_PIMSM | |
430 | ||
6fef4c0c | 431 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 432 | { |
4feb88e5 | 433 | struct net *net = dev_net(dev); |
f0ad0860 PM |
434 | struct mr_table *mrt; |
435 | struct flowi fl = { | |
436 | .oif = dev->ifindex, | |
437 | .iif = skb->skb_iif, | |
438 | .mark = skb->mark, | |
439 | }; | |
440 | int err; | |
441 | ||
442 | err = ipmr_fib_lookup(net, &fl, &mrt); | |
443 | if (err < 0) | |
444 | return err; | |
4feb88e5 | 445 | |
1da177e4 | 446 | read_lock(&mrt_lock); |
cf3677ae PE |
447 | dev->stats.tx_bytes += skb->len; |
448 | dev->stats.tx_packets++; | |
0c12295a | 449 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
450 | read_unlock(&mrt_lock); |
451 | kfree_skb(skb); | |
6ed10654 | 452 | return NETDEV_TX_OK; |
1da177e4 LT |
453 | } |
454 | ||
007c3838 SH |
455 | static const struct net_device_ops reg_vif_netdev_ops = { |
456 | .ndo_start_xmit = reg_vif_xmit, | |
457 | }; | |
458 | ||
1da177e4 LT |
459 | static void reg_vif_setup(struct net_device *dev) |
460 | { | |
461 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 462 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 463 | dev->flags = IFF_NOARP; |
007c3838 | 464 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 | 465 | dev->destructor = free_netdev; |
403dbb97 | 466 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
467 | } |
468 | ||
f0ad0860 | 469 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
470 | { |
471 | struct net_device *dev; | |
472 | struct in_device *in_dev; | |
f0ad0860 PM |
473 | char name[IFNAMSIZ]; |
474 | ||
475 | if (mrt->id == RT_TABLE_DEFAULT) | |
476 | sprintf(name, "pimreg"); | |
477 | else | |
478 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 479 | |
f0ad0860 | 480 | dev = alloc_netdev(0, name, reg_vif_setup); |
1da177e4 LT |
481 | |
482 | if (dev == NULL) | |
483 | return NULL; | |
484 | ||
403dbb97 TG |
485 | dev_net_set(dev, net); |
486 | ||
1da177e4 LT |
487 | if (register_netdevice(dev)) { |
488 | free_netdev(dev); | |
489 | return NULL; | |
490 | } | |
491 | dev->iflink = 0; | |
492 | ||
71e27da9 HX |
493 | rcu_read_lock(); |
494 | if ((in_dev = __in_dev_get_rcu(dev)) == NULL) { | |
495 | rcu_read_unlock(); | |
1da177e4 | 496 | goto failure; |
71e27da9 | 497 | } |
1da177e4 | 498 | |
71e27da9 HX |
499 | ipv4_devconf_setall(in_dev); |
500 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
501 | rcu_read_unlock(); | |
1da177e4 LT |
502 | |
503 | if (dev_open(dev)) | |
504 | goto failure; | |
505 | ||
7dc00c82 WC |
506 | dev_hold(dev); |
507 | ||
1da177e4 LT |
508 | return dev; |
509 | ||
510 | failure: | |
511 | /* allow the register to be completed before unregistering. */ | |
512 | rtnl_unlock(); | |
513 | rtnl_lock(); | |
514 | ||
515 | unregister_netdevice(dev); | |
516 | return NULL; | |
517 | } | |
518 | #endif | |
519 | ||
520 | /* | |
521 | * Delete a VIF entry | |
7dc00c82 | 522 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 523 | */ |
e905a9ed | 524 | |
0c12295a | 525 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 526 | struct list_head *head) |
1da177e4 LT |
527 | { |
528 | struct vif_device *v; | |
529 | struct net_device *dev; | |
530 | struct in_device *in_dev; | |
531 | ||
0c12295a | 532 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
533 | return -EADDRNOTAVAIL; |
534 | ||
0c12295a | 535 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
536 | |
537 | write_lock_bh(&mrt_lock); | |
538 | dev = v->dev; | |
539 | v->dev = NULL; | |
540 | ||
541 | if (!dev) { | |
542 | write_unlock_bh(&mrt_lock); | |
543 | return -EADDRNOTAVAIL; | |
544 | } | |
545 | ||
546 | #ifdef CONFIG_IP_PIMSM | |
0c12295a PM |
547 | if (vifi == mrt->mroute_reg_vif_num) |
548 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 LT |
549 | #endif |
550 | ||
0c12295a | 551 | if (vifi+1 == mrt->maxvif) { |
1da177e4 LT |
552 | int tmp; |
553 | for (tmp=vifi-1; tmp>=0; tmp--) { | |
0c12295a | 554 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
555 | break; |
556 | } | |
0c12295a | 557 | mrt->maxvif = tmp+1; |
1da177e4 LT |
558 | } |
559 | ||
560 | write_unlock_bh(&mrt_lock); | |
561 | ||
562 | dev_set_allmulti(dev, -1); | |
563 | ||
e5ed6399 | 564 | if ((in_dev = __in_dev_get_rtnl(dev)) != NULL) { |
42f811b8 | 565 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
1da177e4 LT |
566 | ip_rt_multicast_event(in_dev); |
567 | } | |
568 | ||
7dc00c82 | 569 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER) && !notify) |
d17fa6fa | 570 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
571 | |
572 | dev_put(dev); | |
573 | return 0; | |
574 | } | |
575 | ||
5c0a66f5 BT |
576 | static inline void ipmr_cache_free(struct mfc_cache *c) |
577 | { | |
5c0a66f5 BT |
578 | kmem_cache_free(mrt_cachep, c); |
579 | } | |
580 | ||
1da177e4 LT |
581 | /* Destroy an unresolved cache entry, killing queued skbs |
582 | and reporting error to netlink readers. | |
583 | */ | |
584 | ||
0c12295a | 585 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 586 | { |
8de53dfb | 587 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 588 | struct sk_buff *skb; |
9ef1d4c7 | 589 | struct nlmsgerr *e; |
1da177e4 | 590 | |
0c12295a | 591 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 592 | |
c354e124 | 593 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 594 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
595 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
596 | nlh->nlmsg_type = NLMSG_ERROR; | |
597 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
598 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
599 | e = NLMSG_DATA(nlh); |
600 | e->error = -ETIMEDOUT; | |
601 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 602 | |
4feb88e5 | 603 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 LT |
604 | } else |
605 | kfree_skb(skb); | |
606 | } | |
607 | ||
5c0a66f5 | 608 | ipmr_cache_free(c); |
1da177e4 LT |
609 | } |
610 | ||
611 | ||
e258beb2 | 612 | /* Timer process for the unresolved queue. */ |
1da177e4 | 613 | |
e258beb2 | 614 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 615 | { |
0c12295a | 616 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
617 | unsigned long now; |
618 | unsigned long expires; | |
862465f2 | 619 | struct mfc_cache *c, *next; |
1da177e4 LT |
620 | |
621 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 622 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
623 | return; |
624 | } | |
625 | ||
0c12295a | 626 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
627 | goto out; |
628 | ||
629 | now = jiffies; | |
630 | expires = 10*HZ; | |
1da177e4 | 631 | |
0c12295a | 632 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
633 | if (time_after(c->mfc_un.unres.expires, now)) { |
634 | unsigned long interval = c->mfc_un.unres.expires - now; | |
635 | if (interval < expires) | |
636 | expires = interval; | |
1da177e4 LT |
637 | continue; |
638 | } | |
639 | ||
862465f2 | 640 | list_del(&c->list); |
0c12295a | 641 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
642 | } |
643 | ||
0c12295a PM |
644 | if (!list_empty(&mrt->mfc_unres_queue)) |
645 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
646 | |
647 | out: | |
648 | spin_unlock(&mfc_unres_lock); | |
649 | } | |
650 | ||
651 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
652 | ||
0c12295a | 653 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 654 | unsigned char *ttls) |
1da177e4 LT |
655 | { |
656 | int vifi; | |
657 | ||
658 | cache->mfc_un.res.minvif = MAXVIFS; | |
659 | cache->mfc_un.res.maxvif = 0; | |
660 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
661 | ||
0c12295a PM |
662 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
663 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 664 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
665 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
666 | if (cache->mfc_un.res.minvif > vifi) | |
667 | cache->mfc_un.res.minvif = vifi; | |
668 | if (cache->mfc_un.res.maxvif <= vifi) | |
669 | cache->mfc_un.res.maxvif = vifi + 1; | |
670 | } | |
671 | } | |
672 | } | |
673 | ||
0c12295a PM |
674 | static int vif_add(struct net *net, struct mr_table *mrt, |
675 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
676 | { |
677 | int vifi = vifc->vifc_vifi; | |
0c12295a | 678 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
679 | struct net_device *dev; |
680 | struct in_device *in_dev; | |
d607032d | 681 | int err; |
1da177e4 LT |
682 | |
683 | /* Is vif busy ? */ | |
0c12295a | 684 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
685 | return -EADDRINUSE; |
686 | ||
687 | switch (vifc->vifc_flags) { | |
688 | #ifdef CONFIG_IP_PIMSM | |
689 | case VIFF_REGISTER: | |
690 | /* | |
691 | * Special Purpose VIF in PIM | |
692 | * All the packets will be sent to the daemon | |
693 | */ | |
0c12295a | 694 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 695 | return -EADDRINUSE; |
f0ad0860 | 696 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
697 | if (!dev) |
698 | return -ENOBUFS; | |
d607032d WC |
699 | err = dev_set_allmulti(dev, 1); |
700 | if (err) { | |
701 | unregister_netdevice(dev); | |
7dc00c82 | 702 | dev_put(dev); |
d607032d WC |
703 | return err; |
704 | } | |
1da177e4 LT |
705 | break; |
706 | #endif | |
e905a9ed | 707 | case VIFF_TUNNEL: |
4feb88e5 | 708 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
709 | if (!dev) |
710 | return -ENOBUFS; | |
d607032d WC |
711 | err = dev_set_allmulti(dev, 1); |
712 | if (err) { | |
713 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 714 | dev_put(dev); |
d607032d WC |
715 | return err; |
716 | } | |
1da177e4 | 717 | break; |
ee5e81f0 I |
718 | |
719 | case VIFF_USE_IFINDEX: | |
1da177e4 | 720 | case 0: |
ee5e81f0 I |
721 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
722 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
723 | if (dev && dev->ip_ptr == NULL) { | |
724 | dev_put(dev); | |
725 | return -EADDRNOTAVAIL; | |
726 | } | |
727 | } else | |
728 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); | |
729 | ||
1da177e4 LT |
730 | if (!dev) |
731 | return -EADDRNOTAVAIL; | |
d607032d | 732 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
733 | if (err) { |
734 | dev_put(dev); | |
d607032d | 735 | return err; |
7dc00c82 | 736 | } |
1da177e4 LT |
737 | break; |
738 | default: | |
739 | return -EINVAL; | |
740 | } | |
741 | ||
d0490cfd DC |
742 | if ((in_dev = __in_dev_get_rtnl(dev)) == NULL) { |
743 | dev_put(dev); | |
1da177e4 | 744 | return -EADDRNOTAVAIL; |
d0490cfd | 745 | } |
42f811b8 | 746 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
1da177e4 LT |
747 | ip_rt_multicast_event(in_dev); |
748 | ||
749 | /* | |
750 | * Fill in the VIF structures | |
751 | */ | |
c354e124 JK |
752 | v->rate_limit = vifc->vifc_rate_limit; |
753 | v->local = vifc->vifc_lcl_addr.s_addr; | |
754 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
755 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
756 | if (!mrtsock) |
757 | v->flags |= VIFF_STATIC; | |
c354e124 | 758 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
759 | v->bytes_in = 0; |
760 | v->bytes_out = 0; | |
761 | v->pkt_in = 0; | |
762 | v->pkt_out = 0; | |
763 | v->link = dev->ifindex; | |
764 | if (v->flags&(VIFF_TUNNEL|VIFF_REGISTER)) | |
765 | v->link = dev->iflink; | |
766 | ||
767 | /* And finish update writing critical data */ | |
768 | write_lock_bh(&mrt_lock); | |
c354e124 | 769 | v->dev = dev; |
1da177e4 LT |
770 | #ifdef CONFIG_IP_PIMSM |
771 | if (v->flags&VIFF_REGISTER) | |
0c12295a | 772 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 773 | #endif |
0c12295a PM |
774 | if (vifi+1 > mrt->maxvif) |
775 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
776 | write_unlock_bh(&mrt_lock); |
777 | return 0; | |
778 | } | |
779 | ||
0c12295a | 780 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
781 | __be32 origin, |
782 | __be32 mcastgrp) | |
1da177e4 | 783 | { |
c354e124 | 784 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
785 | struct mfc_cache *c; |
786 | ||
0c12295a | 787 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
788 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
789 | return c; | |
1da177e4 | 790 | } |
862465f2 | 791 | return NULL; |
1da177e4 LT |
792 | } |
793 | ||
794 | /* | |
795 | * Allocate a multicast cache entry | |
796 | */ | |
d658f8a0 | 797 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 798 | { |
c354e124 JK |
799 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
800 | if (c == NULL) | |
1da177e4 | 801 | return NULL; |
1da177e4 LT |
802 | c->mfc_un.res.minvif = MAXVIFS; |
803 | return c; | |
804 | } | |
805 | ||
d658f8a0 | 806 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 807 | { |
c354e124 JK |
808 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
809 | if (c == NULL) | |
1da177e4 | 810 | return NULL; |
1da177e4 LT |
811 | skb_queue_head_init(&c->mfc_un.unres.unresolved); |
812 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
813 | return c; | |
814 | } | |
815 | ||
816 | /* | |
817 | * A cache entry has gone into a resolved state from queued | |
818 | */ | |
e905a9ed | 819 | |
0c12295a PM |
820 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
821 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
822 | { |
823 | struct sk_buff *skb; | |
9ef1d4c7 | 824 | struct nlmsgerr *e; |
1da177e4 LT |
825 | |
826 | /* | |
827 | * Play the pending entries through our router | |
828 | */ | |
829 | ||
c354e124 | 830 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 831 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
832 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
833 | ||
0c12295a | 834 | if (ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { |
27a884dc ACM |
835 | nlh->nlmsg_len = (skb_tail_pointer(skb) - |
836 | (u8 *)nlh); | |
1da177e4 LT |
837 | } else { |
838 | nlh->nlmsg_type = NLMSG_ERROR; | |
839 | nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); | |
840 | skb_trim(skb, nlh->nlmsg_len); | |
9ef1d4c7 PM |
841 | e = NLMSG_DATA(nlh); |
842 | e->error = -EMSGSIZE; | |
843 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 844 | } |
2942e900 | 845 | |
d658f8a0 | 846 | rtnl_unicast(skb, net, NETLINK_CB(skb).pid); |
1da177e4 | 847 | } else |
0c12295a | 848 | ip_mr_forward(net, mrt, skb, c, 0); |
1da177e4 LT |
849 | } |
850 | } | |
851 | ||
852 | /* | |
853 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
854 | * expects the following bizarre scheme. | |
855 | * | |
856 | * Called under mrt_lock. | |
857 | */ | |
e905a9ed | 858 | |
0c12295a | 859 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 860 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
861 | { |
862 | struct sk_buff *skb; | |
c9bdd4b5 | 863 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
864 | struct igmphdr *igmp; |
865 | struct igmpmsg *msg; | |
866 | int ret; | |
867 | ||
868 | #ifdef CONFIG_IP_PIMSM | |
869 | if (assert == IGMPMSG_WHOLEPKT) | |
870 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
871 | else | |
872 | #endif | |
873 | skb = alloc_skb(128, GFP_ATOMIC); | |
874 | ||
132adf54 | 875 | if (!skb) |
1da177e4 LT |
876 | return -ENOBUFS; |
877 | ||
878 | #ifdef CONFIG_IP_PIMSM | |
879 | if (assert == IGMPMSG_WHOLEPKT) { | |
880 | /* Ugly, but we have no choice with this interface. | |
881 | Duplicate old header, fix ihl, length etc. | |
882 | And all this only to mangle msg->im_msgtype and | |
883 | to set msg->im_mbz to "mbz" :-) | |
884 | */ | |
878c8145 ACM |
885 | skb_push(skb, sizeof(struct iphdr)); |
886 | skb_reset_network_header(skb); | |
badff6d0 | 887 | skb_reset_transport_header(skb); |
0272ffc4 | 888 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 889 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
890 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
891 | msg->im_mbz = 0; | |
0c12295a | 892 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
893 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
894 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
895 | sizeof(struct iphdr)); | |
e905a9ed | 896 | } else |
1da177e4 | 897 | #endif |
e905a9ed YH |
898 | { |
899 | ||
1da177e4 LT |
900 | /* |
901 | * Copy the IP header | |
902 | */ | |
903 | ||
27a884dc | 904 | skb->network_header = skb->tail; |
ddc7b8e3 | 905 | skb_put(skb, ihl); |
27d7ff46 | 906 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
eddc9ec5 ACM |
907 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
908 | msg = (struct igmpmsg *)skb_network_header(skb); | |
1da177e4 | 909 | msg->im_vif = vifi; |
adf30907 | 910 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 LT |
911 | |
912 | /* | |
913 | * Add our header | |
914 | */ | |
915 | ||
c354e124 | 916 | igmp=(struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
917 | igmp->type = |
918 | msg->im_msgtype = assert; | |
919 | igmp->code = 0; | |
eddc9ec5 | 920 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ |
b0e380b1 | 921 | skb->transport_header = skb->network_header; |
e905a9ed | 922 | } |
1da177e4 | 923 | |
0c12295a | 924 | if (mrt->mroute_sk == NULL) { |
1da177e4 LT |
925 | kfree_skb(skb); |
926 | return -EINVAL; | |
927 | } | |
928 | ||
929 | /* | |
930 | * Deliver to mrouted | |
931 | */ | |
0c12295a | 932 | ret = sock_queue_rcv_skb(mrt->mroute_sk, skb); |
70a269e6 | 933 | if (ret < 0) { |
1da177e4 LT |
934 | if (net_ratelimit()) |
935 | printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); | |
936 | kfree_skb(skb); | |
937 | } | |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
942 | /* | |
943 | * Queue a packet for resolution. It gets locked cache entry! | |
944 | */ | |
e905a9ed | 945 | |
1da177e4 | 946 | static int |
0c12295a | 947 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 948 | { |
862465f2 | 949 | bool found = false; |
1da177e4 LT |
950 | int err; |
951 | struct mfc_cache *c; | |
eddc9ec5 | 952 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
953 | |
954 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 955 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 956 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
957 | c->mfc_origin == iph->saddr) { |
958 | found = true; | |
1da177e4 | 959 | break; |
862465f2 | 960 | } |
1da177e4 LT |
961 | } |
962 | ||
862465f2 | 963 | if (!found) { |
1da177e4 LT |
964 | /* |
965 | * Create a new entry if allowable | |
966 | */ | |
967 | ||
0c12295a | 968 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 969 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
970 | spin_unlock_bh(&mfc_unres_lock); |
971 | ||
972 | kfree_skb(skb); | |
973 | return -ENOBUFS; | |
974 | } | |
975 | ||
976 | /* | |
977 | * Fill in the new cache entry | |
978 | */ | |
eddc9ec5 ACM |
979 | c->mfc_parent = -1; |
980 | c->mfc_origin = iph->saddr; | |
981 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 LT |
982 | |
983 | /* | |
984 | * Reflect first query at mrouted. | |
985 | */ | |
0c12295a | 986 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 987 | if (err < 0) { |
e905a9ed | 988 | /* If the report failed throw the cache entry |
1da177e4 LT |
989 | out - Brad Parker |
990 | */ | |
991 | spin_unlock_bh(&mfc_unres_lock); | |
992 | ||
5c0a66f5 | 993 | ipmr_cache_free(c); |
1da177e4 LT |
994 | kfree_skb(skb); |
995 | return err; | |
996 | } | |
997 | ||
0c12295a PM |
998 | atomic_inc(&mrt->cache_resolve_queue_len); |
999 | list_add(&c->list, &mrt->mfc_unres_queue); | |
1da177e4 | 1000 | |
0c12295a | 1001 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | /* | |
1005 | * See if we can append the packet | |
1006 | */ | |
1007 | if (c->mfc_un.unres.unresolved.qlen>3) { | |
1008 | kfree_skb(skb); | |
1009 | err = -ENOBUFS; | |
1010 | } else { | |
c354e124 | 1011 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1012 | err = 0; |
1013 | } | |
1014 | ||
1015 | spin_unlock_bh(&mfc_unres_lock); | |
1016 | return err; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * MFC cache manipulation by user space mroute daemon | |
1021 | */ | |
1022 | ||
0c12295a | 1023 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc) |
1da177e4 LT |
1024 | { |
1025 | int line; | |
862465f2 | 1026 | struct mfc_cache *c, *next; |
1da177e4 | 1027 | |
c354e124 | 1028 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1029 | |
0c12295a | 1030 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 LT |
1031 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
1032 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { | |
1033 | write_lock_bh(&mrt_lock); | |
862465f2 | 1034 | list_del(&c->list); |
1da177e4 LT |
1035 | write_unlock_bh(&mrt_lock); |
1036 | ||
5c0a66f5 | 1037 | ipmr_cache_free(c); |
1da177e4 LT |
1038 | return 0; |
1039 | } | |
1040 | } | |
1041 | return -ENOENT; | |
1042 | } | |
1043 | ||
0c12295a PM |
1044 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
1045 | struct mfcctl *mfc, int mrtsock) | |
1da177e4 | 1046 | { |
862465f2 | 1047 | bool found = false; |
1da177e4 | 1048 | int line; |
862465f2 | 1049 | struct mfc_cache *uc, *c; |
1da177e4 | 1050 | |
a50436f2 PM |
1051 | if (mfc->mfcc_parent >= MAXVIFS) |
1052 | return -ENFILE; | |
1053 | ||
c354e124 | 1054 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1055 | |
0c12295a | 1056 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1057 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
862465f2 PM |
1058 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { |
1059 | found = true; | |
1da177e4 | 1060 | break; |
862465f2 | 1061 | } |
1da177e4 LT |
1062 | } |
1063 | ||
862465f2 | 1064 | if (found) { |
1da177e4 LT |
1065 | write_lock_bh(&mrt_lock); |
1066 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1067 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1068 | if (!mrtsock) |
1069 | c->mfc_flags |= MFC_STATIC; | |
1070 | write_unlock_bh(&mrt_lock); | |
1071 | return 0; | |
1072 | } | |
1073 | ||
f97c1e0c | 1074 | if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1075 | return -EINVAL; |
1076 | ||
d658f8a0 | 1077 | c = ipmr_cache_alloc(); |
c354e124 | 1078 | if (c == NULL) |
1da177e4 LT |
1079 | return -ENOMEM; |
1080 | ||
c354e124 JK |
1081 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1082 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1083 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1084 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1085 | if (!mrtsock) |
1086 | c->mfc_flags |= MFC_STATIC; | |
1087 | ||
1088 | write_lock_bh(&mrt_lock); | |
0c12295a | 1089 | list_add(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1090 | write_unlock_bh(&mrt_lock); |
1091 | ||
1092 | /* | |
1093 | * Check to see if we resolved a queued list. If so we | |
1094 | * need to send on the frames and tidy up. | |
1095 | */ | |
b0ebb739 | 1096 | found = false; |
1da177e4 | 1097 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1098 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1099 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1100 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1101 | list_del(&uc->list); |
0c12295a | 1102 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1103 | found = true; |
1da177e4 LT |
1104 | break; |
1105 | } | |
1106 | } | |
0c12295a PM |
1107 | if (list_empty(&mrt->mfc_unres_queue)) |
1108 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1109 | spin_unlock_bh(&mfc_unres_lock); |
1110 | ||
b0ebb739 | 1111 | if (found) { |
0c12295a | 1112 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1113 | ipmr_cache_free(uc); |
1da177e4 LT |
1114 | } |
1115 | return 0; | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Close the multicast socket, and clear the vif tables etc | |
1120 | */ | |
e905a9ed | 1121 | |
0c12295a | 1122 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1123 | { |
1124 | int i; | |
d17fa6fa | 1125 | LIST_HEAD(list); |
862465f2 | 1126 | struct mfc_cache *c, *next; |
e905a9ed | 1127 | |
1da177e4 LT |
1128 | /* |
1129 | * Shut down all active vif entries | |
1130 | */ | |
0c12295a PM |
1131 | for (i = 0; i < mrt->maxvif; i++) { |
1132 | if (!(mrt->vif_table[i].flags&VIFF_STATIC)) | |
1133 | vif_delete(mrt, i, 0, &list); | |
1da177e4 | 1134 | } |
d17fa6fa | 1135 | unregister_netdevice_many(&list); |
1da177e4 LT |
1136 | |
1137 | /* | |
1138 | * Wipe the cache | |
1139 | */ | |
862465f2 | 1140 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1141 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
862465f2 | 1142 | if (c->mfc_flags&MFC_STATIC) |
1da177e4 | 1143 | continue; |
1da177e4 | 1144 | write_lock_bh(&mrt_lock); |
862465f2 | 1145 | list_del(&c->list); |
1da177e4 LT |
1146 | write_unlock_bh(&mrt_lock); |
1147 | ||
5c0a66f5 | 1148 | ipmr_cache_free(c); |
1da177e4 LT |
1149 | } |
1150 | } | |
1151 | ||
0c12295a | 1152 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1153 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1154 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1155 | list_del(&c->list); |
0c12295a | 1156 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1157 | } |
1158 | spin_unlock_bh(&mfc_unres_lock); | |
1159 | } | |
1160 | } | |
1161 | ||
1162 | static void mrtsock_destruct(struct sock *sk) | |
1163 | { | |
4feb88e5 | 1164 | struct net *net = sock_net(sk); |
f0ad0860 | 1165 | struct mr_table *mrt; |
4feb88e5 | 1166 | |
1da177e4 | 1167 | rtnl_lock(); |
f0ad0860 PM |
1168 | ipmr_for_each_table(mrt, net) { |
1169 | if (sk == mrt->mroute_sk) { | |
1170 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; | |
1da177e4 | 1171 | |
f0ad0860 PM |
1172 | write_lock_bh(&mrt_lock); |
1173 | mrt->mroute_sk = NULL; | |
1174 | write_unlock_bh(&mrt_lock); | |
1da177e4 | 1175 | |
f0ad0860 PM |
1176 | mroute_clean_tables(mrt); |
1177 | } | |
1da177e4 LT |
1178 | } |
1179 | rtnl_unlock(); | |
1180 | } | |
1181 | ||
1182 | /* | |
1183 | * Socket options and virtual interface manipulation. The whole | |
1184 | * virtual interface system is a complete heap, but unfortunately | |
1185 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1186 | * MOSPF/PIM router set up we can clean this up. | |
1187 | */ | |
e905a9ed | 1188 | |
b7058842 | 1189 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 LT |
1190 | { |
1191 | int ret; | |
1192 | struct vifctl vif; | |
1193 | struct mfcctl mfc; | |
4feb88e5 | 1194 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1195 | struct mr_table *mrt; |
1196 | ||
1197 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1198 | if (mrt == NULL) | |
1199 | return -ENOENT; | |
e905a9ed | 1200 | |
132adf54 | 1201 | if (optname != MRT_INIT) { |
0c12295a | 1202 | if (sk != mrt->mroute_sk && !capable(CAP_NET_ADMIN)) |
1da177e4 LT |
1203 | return -EACCES; |
1204 | } | |
1205 | ||
132adf54 SH |
1206 | switch (optname) { |
1207 | case MRT_INIT: | |
1208 | if (sk->sk_type != SOCK_RAW || | |
c720c7e8 | 1209 | inet_sk(sk)->inet_num != IPPROTO_IGMP) |
132adf54 | 1210 | return -EOPNOTSUPP; |
c354e124 | 1211 | if (optlen != sizeof(int)) |
132adf54 | 1212 | return -ENOPROTOOPT; |
1da177e4 | 1213 | |
132adf54 | 1214 | rtnl_lock(); |
0c12295a | 1215 | if (mrt->mroute_sk) { |
1da177e4 | 1216 | rtnl_unlock(); |
132adf54 SH |
1217 | return -EADDRINUSE; |
1218 | } | |
1219 | ||
1220 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1221 | if (ret == 0) { | |
1222 | write_lock_bh(&mrt_lock); | |
0c12295a | 1223 | mrt->mroute_sk = sk; |
132adf54 SH |
1224 | write_unlock_bh(&mrt_lock); |
1225 | ||
4feb88e5 | 1226 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
132adf54 SH |
1227 | } |
1228 | rtnl_unlock(); | |
1229 | return ret; | |
1230 | case MRT_DONE: | |
0c12295a | 1231 | if (sk != mrt->mroute_sk) |
132adf54 SH |
1232 | return -EACCES; |
1233 | return ip_ra_control(sk, 0, NULL); | |
1234 | case MRT_ADD_VIF: | |
1235 | case MRT_DEL_VIF: | |
c354e124 | 1236 | if (optlen != sizeof(vif)) |
132adf54 | 1237 | return -EINVAL; |
c354e124 | 1238 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1239 | return -EFAULT; |
1240 | if (vif.vifc_vifi >= MAXVIFS) | |
1241 | return -ENFILE; | |
1242 | rtnl_lock(); | |
c354e124 | 1243 | if (optname == MRT_ADD_VIF) { |
0c12295a | 1244 | ret = vif_add(net, mrt, &vif, sk == mrt->mroute_sk); |
132adf54 | 1245 | } else { |
0c12295a | 1246 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1247 | } |
1248 | rtnl_unlock(); | |
1249 | return ret; | |
1da177e4 LT |
1250 | |
1251 | /* | |
1252 | * Manipulate the forwarding caches. These live | |
1253 | * in a sort of kernel/user symbiosis. | |
1254 | */ | |
132adf54 SH |
1255 | case MRT_ADD_MFC: |
1256 | case MRT_DEL_MFC: | |
c354e124 | 1257 | if (optlen != sizeof(mfc)) |
132adf54 | 1258 | return -EINVAL; |
c354e124 | 1259 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 SH |
1260 | return -EFAULT; |
1261 | rtnl_lock(); | |
c354e124 | 1262 | if (optname == MRT_DEL_MFC) |
0c12295a | 1263 | ret = ipmr_mfc_delete(mrt, &mfc); |
132adf54 | 1264 | else |
0c12295a | 1265 | ret = ipmr_mfc_add(net, mrt, &mfc, sk == mrt->mroute_sk); |
132adf54 SH |
1266 | rtnl_unlock(); |
1267 | return ret; | |
1da177e4 LT |
1268 | /* |
1269 | * Control PIM assert. | |
1270 | */ | |
132adf54 SH |
1271 | case MRT_ASSERT: |
1272 | { | |
1273 | int v; | |
1274 | if (get_user(v,(int __user *)optval)) | |
1275 | return -EFAULT; | |
0c12295a | 1276 | mrt->mroute_do_assert = (v) ? 1 : 0; |
132adf54 SH |
1277 | return 0; |
1278 | } | |
1da177e4 | 1279 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1280 | case MRT_PIM: |
1281 | { | |
ba93ef74 SH |
1282 | int v; |
1283 | ||
132adf54 SH |
1284 | if (get_user(v,(int __user *)optval)) |
1285 | return -EFAULT; | |
ba93ef74 SH |
1286 | v = (v) ? 1 : 0; |
1287 | ||
132adf54 SH |
1288 | rtnl_lock(); |
1289 | ret = 0; | |
0c12295a PM |
1290 | if (v != mrt->mroute_do_pim) { |
1291 | mrt->mroute_do_pim = v; | |
1292 | mrt->mroute_do_assert = v; | |
1da177e4 | 1293 | } |
132adf54 SH |
1294 | rtnl_unlock(); |
1295 | return ret; | |
1296 | } | |
f0ad0860 PM |
1297 | #endif |
1298 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1299 | case MRT_TABLE: | |
1300 | { | |
1301 | u32 v; | |
1302 | ||
1303 | if (optlen != sizeof(u32)) | |
1304 | return -EINVAL; | |
1305 | if (get_user(v, (u32 __user *)optval)) | |
1306 | return -EFAULT; | |
1307 | if (sk == mrt->mroute_sk) | |
1308 | return -EBUSY; | |
1309 | ||
1310 | rtnl_lock(); | |
1311 | ret = 0; | |
1312 | if (!ipmr_new_table(net, v)) | |
1313 | ret = -ENOMEM; | |
1314 | raw_sk(sk)->ipmr_table = v; | |
1315 | rtnl_unlock(); | |
1316 | return ret; | |
1317 | } | |
1da177e4 | 1318 | #endif |
132adf54 SH |
1319 | /* |
1320 | * Spurious command, or MRT_VERSION which you cannot | |
1321 | * set. | |
1322 | */ | |
1323 | default: | |
1324 | return -ENOPROTOOPT; | |
1da177e4 LT |
1325 | } |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Getsock opt support for the multicast routing system. | |
1330 | */ | |
e905a9ed | 1331 | |
c354e124 | 1332 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1333 | { |
1334 | int olr; | |
1335 | int val; | |
4feb88e5 | 1336 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1337 | struct mr_table *mrt; |
1338 | ||
1339 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1340 | if (mrt == NULL) | |
1341 | return -ENOENT; | |
1da177e4 | 1342 | |
c354e124 | 1343 | if (optname != MRT_VERSION && |
1da177e4 LT |
1344 | #ifdef CONFIG_IP_PIMSM |
1345 | optname!=MRT_PIM && | |
1346 | #endif | |
1347 | optname!=MRT_ASSERT) | |
1348 | return -ENOPROTOOPT; | |
1349 | ||
1350 | if (get_user(olr, optlen)) | |
1351 | return -EFAULT; | |
1352 | ||
1353 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1354 | if (olr < 0) | |
1355 | return -EINVAL; | |
e905a9ed | 1356 | |
c354e124 | 1357 | if (put_user(olr, optlen)) |
1da177e4 | 1358 | return -EFAULT; |
c354e124 JK |
1359 | if (optname == MRT_VERSION) |
1360 | val = 0x0305; | |
1da177e4 | 1361 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1362 | else if (optname == MRT_PIM) |
0c12295a | 1363 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1364 | #endif |
1365 | else | |
0c12295a | 1366 | val = mrt->mroute_do_assert; |
c354e124 | 1367 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1368 | return -EFAULT; |
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | /* | |
1373 | * The IP multicast ioctl support routines. | |
1374 | */ | |
e905a9ed | 1375 | |
1da177e4 LT |
1376 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1377 | { | |
1378 | struct sioc_sg_req sr; | |
1379 | struct sioc_vif_req vr; | |
1380 | struct vif_device *vif; | |
1381 | struct mfc_cache *c; | |
4feb88e5 | 1382 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1383 | struct mr_table *mrt; |
1384 | ||
1385 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1386 | if (mrt == NULL) | |
1387 | return -ENOENT; | |
e905a9ed | 1388 | |
132adf54 SH |
1389 | switch (cmd) { |
1390 | case SIOCGETVIFCNT: | |
c354e124 | 1391 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1392 | return -EFAULT; |
0c12295a | 1393 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1394 | return -EINVAL; |
1395 | read_lock(&mrt_lock); | |
0c12295a PM |
1396 | vif = &mrt->vif_table[vr.vifi]; |
1397 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1398 | vr.icount = vif->pkt_in; |
1399 | vr.ocount = vif->pkt_out; | |
1400 | vr.ibytes = vif->bytes_in; | |
1401 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1402 | read_unlock(&mrt_lock); |
1da177e4 | 1403 | |
c354e124 | 1404 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1405 | return -EFAULT; |
1406 | return 0; | |
1407 | } | |
1408 | read_unlock(&mrt_lock); | |
1409 | return -EADDRNOTAVAIL; | |
1410 | case SIOCGETSGCNT: | |
c354e124 | 1411 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1412 | return -EFAULT; |
1413 | ||
1414 | read_lock(&mrt_lock); | |
0c12295a | 1415 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1416 | if (c) { |
1417 | sr.pktcnt = c->mfc_un.res.pkt; | |
1418 | sr.bytecnt = c->mfc_un.res.bytes; | |
1419 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1da177e4 | 1420 | read_unlock(&mrt_lock); |
132adf54 | 1421 | |
c354e124 | 1422 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1423 | return -EFAULT; |
1424 | return 0; | |
1425 | } | |
1426 | read_unlock(&mrt_lock); | |
1427 | return -EADDRNOTAVAIL; | |
1428 | default: | |
1429 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1430 | } |
1431 | } | |
1432 | ||
1433 | ||
1434 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1435 | { | |
e9dc8653 | 1436 | struct net_device *dev = ptr; |
4feb88e5 | 1437 | struct net *net = dev_net(dev); |
f0ad0860 | 1438 | struct mr_table *mrt; |
1da177e4 LT |
1439 | struct vif_device *v; |
1440 | int ct; | |
d17fa6fa | 1441 | LIST_HEAD(list); |
e9dc8653 | 1442 | |
1da177e4 LT |
1443 | if (event != NETDEV_UNREGISTER) |
1444 | return NOTIFY_DONE; | |
f0ad0860 PM |
1445 | |
1446 | ipmr_for_each_table(mrt, net) { | |
1447 | v = &mrt->vif_table[0]; | |
1448 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1449 | if (v->dev == dev) | |
1450 | vif_delete(mrt, ct, 1, &list); | |
1451 | } | |
1da177e4 | 1452 | } |
d17fa6fa | 1453 | unregister_netdevice_many(&list); |
1da177e4 LT |
1454 | return NOTIFY_DONE; |
1455 | } | |
1456 | ||
1457 | ||
c354e124 | 1458 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1459 | .notifier_call = ipmr_device_event, |
1460 | }; | |
1461 | ||
1462 | /* | |
1463 | * Encapsulate a packet by attaching a valid IPIP header to it. | |
1464 | * This avoids tunnel drivers and other mess and gives us the speed so | |
1465 | * important for multicast video. | |
1466 | */ | |
e905a9ed | 1467 | |
114c7844 | 1468 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1469 | { |
8856dfa3 | 1470 | struct iphdr *iph; |
eddc9ec5 | 1471 | struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1472 | |
1473 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1474 | skb->transport_header = skb->network_header; |
8856dfa3 | 1475 | skb_reset_network_header(skb); |
eddc9ec5 | 1476 | iph = ip_hdr(skb); |
1da177e4 LT |
1477 | |
1478 | iph->version = 4; | |
e023dd64 ACM |
1479 | iph->tos = old_iph->tos; |
1480 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1481 | iph->frag_off = 0; |
1482 | iph->daddr = daddr; | |
1483 | iph->saddr = saddr; | |
1484 | iph->protocol = IPPROTO_IPIP; | |
1485 | iph->ihl = 5; | |
1486 | iph->tot_len = htons(skb->len); | |
adf30907 | 1487 | ip_select_ident(iph, skb_dst(skb), NULL); |
1da177e4 LT |
1488 | ip_send_check(iph); |
1489 | ||
1da177e4 LT |
1490 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1491 | nf_reset(skb); | |
1492 | } | |
1493 | ||
1494 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1495 | { | |
1496 | struct ip_options * opt = &(IPCB(skb)->opt); | |
1497 | ||
adf30907 | 1498 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
1da177e4 LT |
1499 | |
1500 | if (unlikely(opt->optlen)) | |
1501 | ip_forward_options(skb); | |
1502 | ||
1503 | return dst_output(skb); | |
1504 | } | |
1505 | ||
1506 | /* | |
1507 | * Processing handlers for ipmr_forward | |
1508 | */ | |
1509 | ||
0c12295a PM |
1510 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1511 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1512 | { |
eddc9ec5 | 1513 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1514 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1515 | struct net_device *dev; |
1516 | struct rtable *rt; | |
1517 | int encap = 0; | |
1518 | ||
1519 | if (vif->dev == NULL) | |
1520 | goto out_free; | |
1521 | ||
1522 | #ifdef CONFIG_IP_PIMSM | |
1523 | if (vif->flags & VIFF_REGISTER) { | |
1524 | vif->pkt_out++; | |
c354e124 | 1525 | vif->bytes_out += skb->len; |
cf3677ae PE |
1526 | vif->dev->stats.tx_bytes += skb->len; |
1527 | vif->dev->stats.tx_packets++; | |
0c12295a | 1528 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1529 | goto out_free; |
1da177e4 LT |
1530 | } |
1531 | #endif | |
1532 | ||
1533 | if (vif->flags&VIFF_TUNNEL) { | |
1534 | struct flowi fl = { .oif = vif->link, | |
1535 | .nl_u = { .ip4_u = | |
1536 | { .daddr = vif->remote, | |
1537 | .saddr = vif->local, | |
1538 | .tos = RT_TOS(iph->tos) } }, | |
1539 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1540 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1541 | goto out_free; |
1542 | encap = sizeof(struct iphdr); | |
1543 | } else { | |
1544 | struct flowi fl = { .oif = vif->link, | |
1545 | .nl_u = { .ip4_u = | |
1546 | { .daddr = iph->daddr, | |
1547 | .tos = RT_TOS(iph->tos) } }, | |
1548 | .proto = IPPROTO_IPIP }; | |
4feb88e5 | 1549 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
1550 | goto out_free; |
1551 | } | |
1552 | ||
1553 | dev = rt->u.dst.dev; | |
1554 | ||
1555 | if (skb->len+encap > dst_mtu(&rt->u.dst) && (ntohs(iph->frag_off) & IP_DF)) { | |
1556 | /* Do not fragment multicasts. Alas, IPv4 does not | |
1557 | allow to send ICMP, so that packets will disappear | |
1558 | to blackhole. | |
1559 | */ | |
1560 | ||
7c73a6fa | 1561 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1562 | ip_rt_put(rt); |
1563 | goto out_free; | |
1564 | } | |
1565 | ||
1566 | encap += LL_RESERVED_SPACE(dev) + rt->u.dst.header_len; | |
1567 | ||
1568 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1569 | ip_rt_put(rt); |
1da177e4 LT |
1570 | goto out_free; |
1571 | } | |
1572 | ||
1573 | vif->pkt_out++; | |
c354e124 | 1574 | vif->bytes_out += skb->len; |
1da177e4 | 1575 | |
adf30907 ED |
1576 | skb_dst_drop(skb); |
1577 | skb_dst_set(skb, &rt->u.dst); | |
eddc9ec5 | 1578 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1579 | |
1580 | /* FIXME: forward and output firewalls used to be called here. | |
1581 | * What do we do with netfilter? -- RR */ | |
1582 | if (vif->flags & VIFF_TUNNEL) { | |
1583 | ip_encap(skb, vif->local, vif->remote); | |
1584 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1585 | vif->dev->stats.tx_packets++; |
1586 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1587 | } |
1588 | ||
1589 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1590 | ||
1591 | /* | |
1592 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1593 | * not only before forwarding, but after forwarding on all output | |
1594 | * interfaces. It is clear, if mrouter runs a multicasting | |
1595 | * program, it should receive packets not depending to what interface | |
1596 | * program is joined. | |
1597 | * If we will not make it, the program will have to join on all | |
1598 | * interfaces. On the other hand, multihoming host (or router, but | |
1599 | * not mrouter) cannot join to more than one interface - it will | |
1600 | * result in receiving multiple packets. | |
1601 | */ | |
6e23ae2a | 1602 | NF_HOOK(PF_INET, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1603 | ipmr_forward_finish); |
1604 | return; | |
1605 | ||
1606 | out_free: | |
1607 | kfree_skb(skb); | |
1608 | return; | |
1609 | } | |
1610 | ||
0c12295a | 1611 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1612 | { |
1613 | int ct; | |
0c12295a PM |
1614 | |
1615 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1616 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1617 | break; |
1618 | } | |
1619 | return ct; | |
1620 | } | |
1621 | ||
1622 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1623 | ||
0c12295a PM |
1624 | static int ip_mr_forward(struct net *net, struct mr_table *mrt, |
1625 | struct sk_buff *skb, struct mfc_cache *cache, | |
1626 | int local) | |
1da177e4 LT |
1627 | { |
1628 | int psend = -1; | |
1629 | int vif, ct; | |
1630 | ||
1631 | vif = cache->mfc_parent; | |
1632 | cache->mfc_un.res.pkt++; | |
1633 | cache->mfc_un.res.bytes += skb->len; | |
1634 | ||
1635 | /* | |
1636 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1637 | */ | |
0c12295a | 1638 | if (mrt->vif_table[vif].dev != skb->dev) { |
1da177e4 LT |
1639 | int true_vifi; |
1640 | ||
511c3f92 | 1641 | if (skb_rtable(skb)->fl.iif == 0) { |
1da177e4 LT |
1642 | /* It is our own packet, looped back. |
1643 | Very complicated situation... | |
1644 | ||
1645 | The best workaround until routing daemons will be | |
1646 | fixed is not to redistribute packet, if it was | |
1647 | send through wrong interface. It means, that | |
1648 | multicast applications WILL NOT work for | |
1649 | (S,G), which have default multicast route pointing | |
1650 | to wrong oif. In any case, it is not a good | |
1651 | idea to use multicasting applications on router. | |
1652 | */ | |
1653 | goto dont_forward; | |
1654 | } | |
1655 | ||
1656 | cache->mfc_un.res.wrong_if++; | |
0c12295a | 1657 | true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1658 | |
0c12295a | 1659 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 LT |
1660 | /* pimsm uses asserts, when switching from RPT to SPT, |
1661 | so that we cannot check that packet arrived on an oif. | |
1662 | It is bad, but otherwise we would need to move pretty | |
1663 | large chunk of pimd to kernel. Ough... --ANK | |
1664 | */ | |
0c12295a | 1665 | (mrt->mroute_do_pim || |
6f9374a9 | 1666 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1667 | time_after(jiffies, |
1da177e4 LT |
1668 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1669 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1670 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1671 | } |
1672 | goto dont_forward; | |
1673 | } | |
1674 | ||
0c12295a PM |
1675 | mrt->vif_table[vif].pkt_in++; |
1676 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1677 | |
1678 | /* | |
1679 | * Forward the frame | |
1680 | */ | |
1681 | for (ct = cache->mfc_un.res.maxvif-1; ct >= cache->mfc_un.res.minvif; ct--) { | |
eddc9ec5 | 1682 | if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1683 | if (psend != -1) { |
1684 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1685 | if (skb2) | |
0c12295a PM |
1686 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1687 | psend); | |
1da177e4 | 1688 | } |
c354e124 | 1689 | psend = ct; |
1da177e4 LT |
1690 | } |
1691 | } | |
1692 | if (psend != -1) { | |
1693 | if (local) { | |
1694 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1695 | if (skb2) | |
0c12295a | 1696 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1697 | } else { |
0c12295a | 1698 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
1da177e4 LT |
1699 | return 0; |
1700 | } | |
1701 | } | |
1702 | ||
1703 | dont_forward: | |
1704 | if (!local) | |
1705 | kfree_skb(skb); | |
1706 | return 0; | |
1707 | } | |
1708 | ||
1709 | ||
1710 | /* | |
1711 | * Multicast packets for forwarding arrive here | |
1712 | */ | |
1713 | ||
1714 | int ip_mr_input(struct sk_buff *skb) | |
1715 | { | |
1716 | struct mfc_cache *cache; | |
4feb88e5 | 1717 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1718 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 PM |
1719 | struct mr_table *mrt; |
1720 | int err; | |
1da177e4 LT |
1721 | |
1722 | /* Packet is looped back after forward, it should not be | |
1723 | forwarded second time, but still can be delivered locally. | |
1724 | */ | |
1725 | if (IPCB(skb)->flags&IPSKB_FORWARDED) | |
1726 | goto dont_forward; | |
1727 | ||
f0ad0860 PM |
1728 | err = ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt); |
1729 | if (err < 0) | |
1730 | return err; | |
1731 | ||
1da177e4 LT |
1732 | if (!local) { |
1733 | if (IPCB(skb)->opt.router_alert) { | |
1734 | if (ip_call_ra_chain(skb)) | |
1735 | return 0; | |
eddc9ec5 | 1736 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP){ |
1da177e4 LT |
1737 | /* IGMPv1 (and broken IGMPv2 implementations sort of |
1738 | Cisco IOS <= 11.2(8)) do not put router alert | |
1739 | option to IGMP packets destined to routable | |
1740 | groups. It is very bad, because it means | |
1741 | that we can forward NO IGMP messages. | |
1742 | */ | |
1743 | read_lock(&mrt_lock); | |
0c12295a | 1744 | if (mrt->mroute_sk) { |
2715bcf9 | 1745 | nf_reset(skb); |
0c12295a | 1746 | raw_rcv(mrt->mroute_sk, skb); |
1da177e4 LT |
1747 | read_unlock(&mrt_lock); |
1748 | return 0; | |
1749 | } | |
1750 | read_unlock(&mrt_lock); | |
1751 | } | |
1752 | } | |
1753 | ||
1754 | read_lock(&mrt_lock); | |
0c12295a | 1755 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
1da177e4 LT |
1756 | |
1757 | /* | |
1758 | * No usable cache entry | |
1759 | */ | |
c354e124 | 1760 | if (cache == NULL) { |
1da177e4 LT |
1761 | int vif; |
1762 | ||
1763 | if (local) { | |
1764 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
1765 | ip_local_deliver(skb); | |
1766 | if (skb2 == NULL) { | |
1767 | read_unlock(&mrt_lock); | |
1768 | return -ENOBUFS; | |
1769 | } | |
1770 | skb = skb2; | |
1771 | } | |
1772 | ||
0c12295a | 1773 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 1774 | if (vif >= 0) { |
0c12295a | 1775 | int err = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
1776 | read_unlock(&mrt_lock); |
1777 | ||
1778 | return err; | |
1779 | } | |
1780 | read_unlock(&mrt_lock); | |
1781 | kfree_skb(skb); | |
1782 | return -ENODEV; | |
1783 | } | |
1784 | ||
0c12295a | 1785 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
1786 | |
1787 | read_unlock(&mrt_lock); | |
1788 | ||
1789 | if (local) | |
1790 | return ip_local_deliver(skb); | |
1791 | ||
1792 | return 0; | |
1793 | ||
1794 | dont_forward: | |
1795 | if (local) | |
1796 | return ip_local_deliver(skb); | |
1797 | kfree_skb(skb); | |
1798 | return 0; | |
1799 | } | |
1800 | ||
b1879204 | 1801 | #ifdef CONFIG_IP_PIMSM |
f0ad0860 PM |
1802 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
1803 | unsigned int pimlen) | |
1da177e4 | 1804 | { |
b1879204 IJ |
1805 | struct net_device *reg_dev = NULL; |
1806 | struct iphdr *encap; | |
1da177e4 | 1807 | |
b1879204 | 1808 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 LT |
1809 | /* |
1810 | Check that: | |
1811 | a. packet is really destinted to a multicast group | |
1812 | b. packet is not a NULL-REGISTER | |
1813 | c. packet is not truncated | |
1814 | */ | |
f97c1e0c | 1815 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 1816 | encap->tot_len == 0 || |
b1879204 IJ |
1817 | ntohs(encap->tot_len) + pimlen > skb->len) |
1818 | return 1; | |
1da177e4 LT |
1819 | |
1820 | read_lock(&mrt_lock); | |
0c12295a PM |
1821 | if (mrt->mroute_reg_vif_num >= 0) |
1822 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
1823 | if (reg_dev) |
1824 | dev_hold(reg_dev); | |
1825 | read_unlock(&mrt_lock); | |
1826 | ||
e905a9ed | 1827 | if (reg_dev == NULL) |
b1879204 | 1828 | return 1; |
1da177e4 | 1829 | |
b0e380b1 | 1830 | skb->mac_header = skb->network_header; |
1da177e4 | 1831 | skb_pull(skb, (u8*)encap - skb->data); |
31c7711b | 1832 | skb_reset_network_header(skb); |
1da177e4 | 1833 | skb->dev = reg_dev; |
1da177e4 LT |
1834 | skb->protocol = htons(ETH_P_IP); |
1835 | skb->ip_summed = 0; | |
1836 | skb->pkt_type = PACKET_HOST; | |
adf30907 | 1837 | skb_dst_drop(skb); |
cf3677ae PE |
1838 | reg_dev->stats.rx_bytes += skb->len; |
1839 | reg_dev->stats.rx_packets++; | |
1da177e4 LT |
1840 | nf_reset(skb); |
1841 | netif_rx(skb); | |
1842 | dev_put(reg_dev); | |
b1879204 | 1843 | |
1da177e4 | 1844 | return 0; |
b1879204 IJ |
1845 | } |
1846 | #endif | |
1847 | ||
1848 | #ifdef CONFIG_IP_PIMSM_V1 | |
1849 | /* | |
1850 | * Handle IGMP messages of PIMv1 | |
1851 | */ | |
1852 | ||
1853 | int pim_rcv_v1(struct sk_buff * skb) | |
1854 | { | |
1855 | struct igmphdr *pim; | |
4feb88e5 | 1856 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 1857 | struct mr_table *mrt; |
b1879204 IJ |
1858 | |
1859 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
1860 | goto drop; | |
1861 | ||
1862 | pim = igmp_hdr(skb); | |
1863 | ||
f0ad0860 PM |
1864 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1865 | goto drop; | |
1866 | ||
0c12295a | 1867 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
1868 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
1869 | goto drop; | |
1870 | ||
f0ad0860 | 1871 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
1872 | drop: |
1873 | kfree_skb(skb); | |
1874 | } | |
1da177e4 LT |
1875 | return 0; |
1876 | } | |
1877 | #endif | |
1878 | ||
1879 | #ifdef CONFIG_IP_PIMSM_V2 | |
1880 | static int pim_rcv(struct sk_buff * skb) | |
1881 | { | |
1882 | struct pimreghdr *pim; | |
f0ad0860 PM |
1883 | struct net *net = dev_net(skb->dev); |
1884 | struct mr_table *mrt; | |
1da177e4 | 1885 | |
b1879204 | 1886 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
1887 | goto drop; |
1888 | ||
9c70220b | 1889 | pim = (struct pimreghdr *)skb_transport_header(skb); |
e905a9ed | 1890 | if (pim->type != ((PIM_VERSION<<4)|(PIM_REGISTER)) || |
1da177e4 | 1891 | (pim->flags&PIM_NULL_REGISTER) || |
e905a9ed | 1892 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 1893 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
1894 | goto drop; |
1895 | ||
f0ad0860 PM |
1896 | if (ipmr_fib_lookup(net, &skb_rtable(skb)->fl, &mrt) < 0) |
1897 | goto drop; | |
1898 | ||
1899 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { | |
b1879204 IJ |
1900 | drop: |
1901 | kfree_skb(skb); | |
1902 | } | |
1da177e4 LT |
1903 | return 0; |
1904 | } | |
1905 | #endif | |
1906 | ||
1907 | static int | |
0c12295a | 1908 | ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, struct mfc_cache *c, |
d658f8a0 | 1909 | struct rtmsg *rtm) |
1da177e4 LT |
1910 | { |
1911 | int ct; | |
1912 | struct rtnexthop *nhp; | |
27a884dc | 1913 | u8 *b = skb_tail_pointer(skb); |
1da177e4 LT |
1914 | struct rtattr *mp_head; |
1915 | ||
7438189b ND |
1916 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
1917 | if (c->mfc_parent > MAXVIFS) | |
1918 | return -ENOENT; | |
1919 | ||
0c12295a PM |
1920 | if (VIF_EXISTS(mrt, c->mfc_parent)) |
1921 | RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex); | |
1da177e4 | 1922 | |
c354e124 | 1923 | mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); |
1da177e4 LT |
1924 | |
1925 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 1926 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
1da177e4 LT |
1927 | if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) |
1928 | goto rtattr_failure; | |
c354e124 | 1929 | nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); |
1da177e4 LT |
1930 | nhp->rtnh_flags = 0; |
1931 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 1932 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
1933 | nhp->rtnh_len = sizeof(*nhp); |
1934 | } | |
1935 | } | |
1936 | mp_head->rta_type = RTA_MULTIPATH; | |
27a884dc | 1937 | mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; |
1da177e4 LT |
1938 | rtm->rtm_type = RTN_MULTICAST; |
1939 | return 1; | |
1940 | ||
1941 | rtattr_failure: | |
dc5fc579 | 1942 | nlmsg_trim(skb, b); |
1da177e4 LT |
1943 | return -EMSGSIZE; |
1944 | } | |
1945 | ||
4feb88e5 BT |
1946 | int ipmr_get_route(struct net *net, |
1947 | struct sk_buff *skb, struct rtmsg *rtm, int nowait) | |
1da177e4 LT |
1948 | { |
1949 | int err; | |
f0ad0860 | 1950 | struct mr_table *mrt; |
1da177e4 | 1951 | struct mfc_cache *cache; |
511c3f92 | 1952 | struct rtable *rt = skb_rtable(skb); |
1da177e4 | 1953 | |
f0ad0860 PM |
1954 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
1955 | if (mrt == NULL) | |
1956 | return -ENOENT; | |
1957 | ||
1da177e4 | 1958 | read_lock(&mrt_lock); |
0c12295a | 1959 | cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst); |
1da177e4 | 1960 | |
c354e124 | 1961 | if (cache == NULL) { |
72287490 | 1962 | struct sk_buff *skb2; |
eddc9ec5 | 1963 | struct iphdr *iph; |
1da177e4 LT |
1964 | struct net_device *dev; |
1965 | int vif; | |
1966 | ||
1967 | if (nowait) { | |
1968 | read_unlock(&mrt_lock); | |
1969 | return -EAGAIN; | |
1970 | } | |
1971 | ||
1972 | dev = skb->dev; | |
0c12295a | 1973 | if (dev == NULL || (vif = ipmr_find_vif(mrt, dev)) < 0) { |
1da177e4 LT |
1974 | read_unlock(&mrt_lock); |
1975 | return -ENODEV; | |
1976 | } | |
72287490 AK |
1977 | skb2 = skb_clone(skb, GFP_ATOMIC); |
1978 | if (!skb2) { | |
1979 | read_unlock(&mrt_lock); | |
1980 | return -ENOMEM; | |
1981 | } | |
1982 | ||
e2d1bca7 ACM |
1983 | skb_push(skb2, sizeof(struct iphdr)); |
1984 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
1985 | iph = ip_hdr(skb2); |
1986 | iph->ihl = sizeof(struct iphdr) >> 2; | |
1987 | iph->saddr = rt->rt_src; | |
1988 | iph->daddr = rt->rt_dst; | |
1989 | iph->version = 0; | |
0c12295a | 1990 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 LT |
1991 | read_unlock(&mrt_lock); |
1992 | return err; | |
1993 | } | |
1994 | ||
1995 | if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) | |
1996 | cache->mfc_flags |= MFC_NOTIFY; | |
0c12295a | 1997 | err = ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 LT |
1998 | read_unlock(&mrt_lock); |
1999 | return err; | |
2000 | } | |
2001 | ||
e905a9ed | 2002 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
2003 | /* |
2004 | * The /proc interfaces to multicast routing /proc/ip_mr_cache /proc/ip_mr_vif | |
2005 | */ | |
2006 | struct ipmr_vif_iter { | |
f6bb4514 | 2007 | struct seq_net_private p; |
f0ad0860 | 2008 | struct mr_table *mrt; |
1da177e4 LT |
2009 | int ct; |
2010 | }; | |
2011 | ||
f6bb4514 BT |
2012 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2013 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2014 | loff_t pos) |
2015 | { | |
f0ad0860 | 2016 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2017 | |
2018 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2019 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2020 | continue; |
e905a9ed | 2021 | if (pos-- == 0) |
0c12295a | 2022 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2023 | } |
2024 | return NULL; | |
2025 | } | |
2026 | ||
2027 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2028 | __acquires(mrt_lock) |
1da177e4 | 2029 | { |
f0ad0860 | 2030 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2031 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2032 | struct mr_table *mrt; |
2033 | ||
2034 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2035 | if (mrt == NULL) | |
2036 | return ERR_PTR(-ENOENT); | |
2037 | ||
2038 | iter->mrt = mrt; | |
f6bb4514 | 2039 | |
1da177e4 | 2040 | read_lock(&mrt_lock); |
f6bb4514 | 2041 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2042 | : SEQ_START_TOKEN; |
2043 | } | |
2044 | ||
2045 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2046 | { | |
2047 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2048 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2049 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2050 | |
2051 | ++*pos; | |
2052 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2053 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2054 | |
0c12295a PM |
2055 | while (++iter->ct < mrt->maxvif) { |
2056 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2057 | continue; |
0c12295a | 2058 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2059 | } |
2060 | return NULL; | |
2061 | } | |
2062 | ||
2063 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2064 | __releases(mrt_lock) |
1da177e4 LT |
2065 | { |
2066 | read_unlock(&mrt_lock); | |
2067 | } | |
2068 | ||
2069 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2070 | { | |
f0ad0860 PM |
2071 | struct ipmr_vif_iter *iter = seq->private; |
2072 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2073 | |
1da177e4 | 2074 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2075 | seq_puts(seq, |
1da177e4 LT |
2076 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2077 | } else { | |
2078 | const struct vif_device *vif = v; | |
2079 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2080 | ||
2081 | seq_printf(seq, | |
2082 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2083 | vif - mrt->vif_table, |
e905a9ed | 2084 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2085 | vif->bytes_out, vif->pkt_out, |
2086 | vif->flags, vif->local, vif->remote); | |
2087 | } | |
2088 | return 0; | |
2089 | } | |
2090 | ||
f690808e | 2091 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2092 | .start = ipmr_vif_seq_start, |
2093 | .next = ipmr_vif_seq_next, | |
2094 | .stop = ipmr_vif_seq_stop, | |
2095 | .show = ipmr_vif_seq_show, | |
2096 | }; | |
2097 | ||
2098 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2099 | { | |
f6bb4514 BT |
2100 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2101 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2102 | } |
2103 | ||
9a32144e | 2104 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2105 | .owner = THIS_MODULE, |
2106 | .open = ipmr_vif_open, | |
2107 | .read = seq_read, | |
2108 | .llseek = seq_lseek, | |
f6bb4514 | 2109 | .release = seq_release_net, |
1da177e4 LT |
2110 | }; |
2111 | ||
2112 | struct ipmr_mfc_iter { | |
f6bb4514 | 2113 | struct seq_net_private p; |
f0ad0860 | 2114 | struct mr_table *mrt; |
862465f2 | 2115 | struct list_head *cache; |
1da177e4 LT |
2116 | int ct; |
2117 | }; | |
2118 | ||
2119 | ||
f6bb4514 BT |
2120 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2121 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2122 | { |
f0ad0860 | 2123 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2124 | struct mfc_cache *mfc; |
2125 | ||
1da177e4 | 2126 | read_lock(&mrt_lock); |
862465f2 | 2127 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2128 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 | 2129 | list_for_each_entry(mfc, it->cache, list) |
e905a9ed | 2130 | if (pos-- == 0) |
1da177e4 | 2131 | return mfc; |
862465f2 | 2132 | } |
1da177e4 LT |
2133 | read_unlock(&mrt_lock); |
2134 | ||
1da177e4 | 2135 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2136 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2137 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2138 | if (pos-- == 0) |
1da177e4 LT |
2139 | return mfc; |
2140 | spin_unlock_bh(&mfc_unres_lock); | |
2141 | ||
2142 | it->cache = NULL; | |
2143 | return NULL; | |
2144 | } | |
2145 | ||
2146 | ||
2147 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2148 | { | |
2149 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2150 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2151 | struct mr_table *mrt; |
2152 | ||
2153 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2154 | if (mrt == NULL) | |
2155 | return ERR_PTR(-ENOENT); | |
f6bb4514 | 2156 | |
f0ad0860 | 2157 | it->mrt = mrt; |
1da177e4 LT |
2158 | it->cache = NULL; |
2159 | it->ct = 0; | |
f6bb4514 | 2160 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2161 | : SEQ_START_TOKEN; |
2162 | } | |
2163 | ||
2164 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2165 | { | |
2166 | struct mfc_cache *mfc = v; | |
2167 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2168 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2169 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2170 | |
2171 | ++*pos; | |
2172 | ||
2173 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2174 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2175 | |
862465f2 PM |
2176 | if (mfc->list.next != it->cache) |
2177 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2178 | |
0c12295a | 2179 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2180 | goto end_of_list; |
2181 | ||
0c12295a | 2182 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2183 | |
2184 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2185 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2186 | if (list_empty(it->cache)) |
2187 | continue; | |
2188 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2189 | } |
2190 | ||
2191 | /* exhausted cache_array, show unresolved */ | |
2192 | read_unlock(&mrt_lock); | |
0c12295a | 2193 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2194 | it->ct = 0; |
e905a9ed | 2195 | |
1da177e4 | 2196 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2197 | if (!list_empty(it->cache)) |
2198 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2199 | |
2200 | end_of_list: | |
2201 | spin_unlock_bh(&mfc_unres_lock); | |
2202 | it->cache = NULL; | |
2203 | ||
2204 | return NULL; | |
2205 | } | |
2206 | ||
2207 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2208 | { | |
2209 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2210 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2211 | |
0c12295a | 2212 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2213 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2214 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
1da177e4 LT |
2215 | read_unlock(&mrt_lock); |
2216 | } | |
2217 | ||
2218 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2219 | { | |
2220 | int n; | |
2221 | ||
2222 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2223 | seq_puts(seq, |
1da177e4 LT |
2224 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2225 | } else { | |
2226 | const struct mfc_cache *mfc = v; | |
2227 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2228 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2229 | |
999890b2 | 2230 | seq_printf(seq, "%08lX %08lX %-3hd", |
1da177e4 LT |
2231 | (unsigned long) mfc->mfc_mcastgrp, |
2232 | (unsigned long) mfc->mfc_origin, | |
1ea472e2 | 2233 | mfc->mfc_parent); |
1da177e4 | 2234 | |
0c12295a | 2235 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2236 | seq_printf(seq, " %8lu %8lu %8lu", |
2237 | mfc->mfc_un.res.pkt, | |
2238 | mfc->mfc_un.res.bytes, | |
2239 | mfc->mfc_un.res.wrong_if); | |
132adf54 SH |
2240 | for (n = mfc->mfc_un.res.minvif; |
2241 | n < mfc->mfc_un.res.maxvif; n++ ) { | |
0c12295a | 2242 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2243 | mfc->mfc_un.res.ttls[n] < 255) |
2244 | seq_printf(seq, | |
e905a9ed | 2245 | " %2d:%-3d", |
1da177e4 LT |
2246 | n, mfc->mfc_un.res.ttls[n]); |
2247 | } | |
1ea472e2 BT |
2248 | } else { |
2249 | /* unresolved mfc_caches don't contain | |
2250 | * pkt, bytes and wrong_if values | |
2251 | */ | |
2252 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2253 | } |
2254 | seq_putc(seq, '\n'); | |
2255 | } | |
2256 | return 0; | |
2257 | } | |
2258 | ||
f690808e | 2259 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2260 | .start = ipmr_mfc_seq_start, |
2261 | .next = ipmr_mfc_seq_next, | |
2262 | .stop = ipmr_mfc_seq_stop, | |
2263 | .show = ipmr_mfc_seq_show, | |
2264 | }; | |
2265 | ||
2266 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2267 | { | |
f6bb4514 BT |
2268 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2269 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2270 | } |
2271 | ||
9a32144e | 2272 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2273 | .owner = THIS_MODULE, |
2274 | .open = ipmr_mfc_open, | |
2275 | .read = seq_read, | |
2276 | .llseek = seq_lseek, | |
f6bb4514 | 2277 | .release = seq_release_net, |
1da177e4 | 2278 | }; |
e905a9ed | 2279 | #endif |
1da177e4 LT |
2280 | |
2281 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2282 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2283 | .handler = pim_rcv, |
403dbb97 | 2284 | .netns_ok = 1, |
1da177e4 LT |
2285 | }; |
2286 | #endif | |
2287 | ||
2288 | ||
2289 | /* | |
2290 | * Setup for IP multicast routing | |
2291 | */ | |
cf958ae3 BT |
2292 | static int __net_init ipmr_net_init(struct net *net) |
2293 | { | |
f0ad0860 | 2294 | int err; |
cf958ae3 | 2295 | |
f0ad0860 PM |
2296 | err = ipmr_rules_init(net); |
2297 | if (err < 0) | |
cf958ae3 | 2298 | goto fail; |
f6bb4514 BT |
2299 | |
2300 | #ifdef CONFIG_PROC_FS | |
2301 | err = -ENOMEM; | |
2302 | if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) | |
2303 | goto proc_vif_fail; | |
2304 | if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) | |
2305 | goto proc_cache_fail; | |
2306 | #endif | |
2bb8b26c BT |
2307 | return 0; |
2308 | ||
f6bb4514 BT |
2309 | #ifdef CONFIG_PROC_FS |
2310 | proc_cache_fail: | |
2311 | proc_net_remove(net, "ip_mr_vif"); | |
2312 | proc_vif_fail: | |
f0ad0860 | 2313 | ipmr_rules_exit(net); |
f6bb4514 | 2314 | #endif |
cf958ae3 BT |
2315 | fail: |
2316 | return err; | |
2317 | } | |
2318 | ||
2319 | static void __net_exit ipmr_net_exit(struct net *net) | |
2320 | { | |
f6bb4514 BT |
2321 | #ifdef CONFIG_PROC_FS |
2322 | proc_net_remove(net, "ip_mr_cache"); | |
2323 | proc_net_remove(net, "ip_mr_vif"); | |
2324 | #endif | |
f0ad0860 | 2325 | ipmr_rules_exit(net); |
cf958ae3 BT |
2326 | } |
2327 | ||
2328 | static struct pernet_operations ipmr_net_ops = { | |
2329 | .init = ipmr_net_init, | |
2330 | .exit = ipmr_net_exit, | |
2331 | }; | |
e905a9ed | 2332 | |
03d2f897 | 2333 | int __init ip_mr_init(void) |
1da177e4 | 2334 | { |
03d2f897 WC |
2335 | int err; |
2336 | ||
1da177e4 LT |
2337 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2338 | sizeof(struct mfc_cache), | |
e5d679f3 | 2339 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
20c2df83 | 2340 | NULL); |
03d2f897 WC |
2341 | if (!mrt_cachep) |
2342 | return -ENOMEM; | |
2343 | ||
cf958ae3 BT |
2344 | err = register_pernet_subsys(&ipmr_net_ops); |
2345 | if (err) | |
2346 | goto reg_pernet_fail; | |
2347 | ||
03d2f897 WC |
2348 | err = register_netdevice_notifier(&ip_mr_notifier); |
2349 | if (err) | |
2350 | goto reg_notif_fail; | |
403dbb97 TG |
2351 | #ifdef CONFIG_IP_PIMSM_V2 |
2352 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
2353 | printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); | |
2354 | err = -EAGAIN; | |
2355 | goto add_proto_fail; | |
2356 | } | |
2357 | #endif | |
03d2f897 | 2358 | return 0; |
f6bb4514 | 2359 | |
403dbb97 TG |
2360 | #ifdef CONFIG_IP_PIMSM_V2 |
2361 | add_proto_fail: | |
2362 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2363 | #endif | |
c3e38896 | 2364 | reg_notif_fail: |
cf958ae3 BT |
2365 | unregister_pernet_subsys(&ipmr_net_ops); |
2366 | reg_pernet_fail: | |
c3e38896 | 2367 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2368 | return err; |
1da177e4 | 2369 | } |