Commit | Line | Data |
---|---|---|
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 | |
f77f13e2 | 25 | * Relax this requirement to work with older peers. |
1da177e4 LT |
26 | * |
27 | */ | |
28 | ||
1da177e4 LT |
29 | #include <asm/uaccess.h> |
30 | #include <linux/types.h> | |
4fc268d2 | 31 | #include <linux/capability.h> |
1da177e4 LT |
32 | #include <linux/errno.h> |
33 | #include <linux/timer.h> | |
34 | #include <linux/mm.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/fcntl.h> | |
37 | #include <linux/stat.h> | |
38 | #include <linux/socket.h> | |
39 | #include <linux/in.h> | |
40 | #include <linux/inet.h> | |
41 | #include <linux/netdevice.h> | |
42 | #include <linux/inetdevice.h> | |
43 | #include <linux/igmp.h> | |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/seq_file.h> | |
46 | #include <linux/mroute.h> | |
47 | #include <linux/init.h> | |
46f25dff | 48 | #include <linux/if_ether.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
457c4cbc | 50 | #include <net/net_namespace.h> |
1da177e4 LT |
51 | #include <net/ip.h> |
52 | #include <net/protocol.h> | |
53 | #include <linux/skbuff.h> | |
14c85021 | 54 | #include <net/route.h> |
1da177e4 LT |
55 | #include <net/sock.h> |
56 | #include <net/icmp.h> | |
57 | #include <net/udp.h> | |
58 | #include <net/raw.h> | |
59 | #include <linux/notifier.h> | |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/netfilter_ipv4.h> | |
709b46e8 | 62 | #include <linux/compat.h> |
bc3b2d7f | 63 | #include <linux/export.h> |
c5441932 | 64 | #include <net/ip_tunnels.h> |
1da177e4 | 65 | #include <net/checksum.h> |
dc5fc579 | 66 | #include <net/netlink.h> |
f0ad0860 | 67 | #include <net/fib_rules.h> |
d67b8c61 | 68 | #include <linux/netconf.h> |
1da177e4 LT |
69 | |
70 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) | |
71 | #define CONFIG_IP_PIMSM 1 | |
72 | #endif | |
73 | ||
0c12295a | 74 | struct mr_table { |
f0ad0860 | 75 | struct list_head list; |
8de53dfb PM |
76 | #ifdef CONFIG_NET_NS |
77 | struct net *net; | |
78 | #endif | |
f0ad0860 | 79 | u32 id; |
4c968709 | 80 | struct sock __rcu *mroute_sk; |
0c12295a PM |
81 | struct timer_list ipmr_expire_timer; |
82 | struct list_head mfc_unres_queue; | |
83 | struct list_head mfc_cache_array[MFC_LINES]; | |
84 | struct vif_device vif_table[MAXVIFS]; | |
85 | int maxvif; | |
86 | atomic_t cache_resolve_queue_len; | |
53d6841d JP |
87 | bool mroute_do_assert; |
88 | bool mroute_do_pim; | |
0c12295a PM |
89 | #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) |
90 | int mroute_reg_vif_num; | |
91 | #endif | |
92 | }; | |
93 | ||
f0ad0860 PM |
94 | struct ipmr_rule { |
95 | struct fib_rule common; | |
96 | }; | |
97 | ||
98 | struct ipmr_result { | |
99 | struct mr_table *mrt; | |
100 | }; | |
101 | ||
1da177e4 | 102 | /* Big lock, protecting vif table, mrt cache and mroute socket state. |
a8cb16dd | 103 | * Note that the changes are semaphored via rtnl_lock. |
1da177e4 LT |
104 | */ |
105 | ||
106 | static DEFINE_RWLOCK(mrt_lock); | |
107 | ||
108 | /* | |
109 | * Multicast router control variables | |
110 | */ | |
111 | ||
0c12295a | 112 | #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) |
1da177e4 LT |
113 | |
114 | /* Special spinlock for queue of unresolved entries */ | |
115 | static DEFINE_SPINLOCK(mfc_unres_lock); | |
116 | ||
117 | /* We return to original Alan's scheme. Hash table of resolved | |
a8cb16dd ED |
118 | * entries is changed only in process context and protected |
119 | * with weak lock mrt_lock. Queue of unresolved entries is protected | |
120 | * with strong spinlock mfc_unres_lock. | |
121 | * | |
122 | * In this case data path is free of exclusive locks at all. | |
1da177e4 LT |
123 | */ |
124 | ||
e18b890b | 125 | static struct kmem_cache *mrt_cachep __read_mostly; |
1da177e4 | 126 | |
f0ad0860 | 127 | static struct mr_table *ipmr_new_table(struct net *net, u32 id); |
acbb219d FR |
128 | static void ipmr_free_table(struct mr_table *mrt); |
129 | ||
c4854ec8 RR |
130 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
131 | struct sk_buff *skb, struct mfc_cache *cache, | |
132 | int local); | |
0c12295a | 133 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 134 | struct sk_buff *pkt, vifi_t vifi, int assert); |
cb6a4e46 PM |
135 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
136 | struct mfc_cache *c, struct rtmsg *rtm); | |
8cd3ac9f ND |
137 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, |
138 | int cmd); | |
acbb219d | 139 | static void mroute_clean_tables(struct mr_table *mrt); |
f0ad0860 PM |
140 | static void ipmr_expire_process(unsigned long arg); |
141 | ||
142 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
143 | #define ipmr_for_each_table(mrt, net) \ | |
144 | list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) | |
145 | ||
146 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
147 | { | |
148 | struct mr_table *mrt; | |
149 | ||
150 | ipmr_for_each_table(mrt, net) { | |
151 | if (mrt->id == id) | |
152 | return mrt; | |
153 | } | |
154 | return NULL; | |
155 | } | |
156 | ||
da91981b | 157 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
158 | struct mr_table **mrt) |
159 | { | |
160 | struct ipmr_result res; | |
161 | struct fib_lookup_arg arg = { .result = &res, }; | |
162 | int err; | |
163 | ||
da91981b DM |
164 | err = fib_rules_lookup(net->ipv4.mr_rules_ops, |
165 | flowi4_to_flowi(flp4), 0, &arg); | |
f0ad0860 PM |
166 | if (err < 0) |
167 | return err; | |
168 | *mrt = res.mrt; | |
169 | return 0; | |
170 | } | |
171 | ||
172 | static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, | |
173 | int flags, struct fib_lookup_arg *arg) | |
174 | { | |
175 | struct ipmr_result *res = arg->result; | |
176 | struct mr_table *mrt; | |
1da177e4 | 177 | |
f0ad0860 PM |
178 | switch (rule->action) { |
179 | case FR_ACT_TO_TBL: | |
180 | break; | |
181 | case FR_ACT_UNREACHABLE: | |
182 | return -ENETUNREACH; | |
183 | case FR_ACT_PROHIBIT: | |
184 | return -EACCES; | |
185 | case FR_ACT_BLACKHOLE: | |
186 | default: | |
187 | return -EINVAL; | |
188 | } | |
189 | ||
190 | mrt = ipmr_get_table(rule->fr_net, rule->table); | |
191 | if (mrt == NULL) | |
192 | return -EAGAIN; | |
193 | res->mrt = mrt; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) | |
198 | { | |
199 | return 1; | |
200 | } | |
201 | ||
202 | static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { | |
203 | FRA_GENERIC_POLICY, | |
204 | }; | |
205 | ||
206 | static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
207 | struct fib_rule_hdr *frh, struct nlattr **tb) | |
208 | { | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, | |
213 | struct nlattr **tb) | |
214 | { | |
215 | return 1; | |
216 | } | |
217 | ||
218 | static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, | |
219 | struct fib_rule_hdr *frh) | |
220 | { | |
221 | frh->dst_len = 0; | |
222 | frh->src_len = 0; | |
223 | frh->tos = 0; | |
224 | return 0; | |
225 | } | |
226 | ||
04a6f82c | 227 | static const struct fib_rules_ops __net_initconst ipmr_rules_ops_template = { |
25239cee | 228 | .family = RTNL_FAMILY_IPMR, |
f0ad0860 PM |
229 | .rule_size = sizeof(struct ipmr_rule), |
230 | .addr_size = sizeof(u32), | |
231 | .action = ipmr_rule_action, | |
232 | .match = ipmr_rule_match, | |
233 | .configure = ipmr_rule_configure, | |
234 | .compare = ipmr_rule_compare, | |
235 | .default_pref = fib_default_rule_pref, | |
236 | .fill = ipmr_rule_fill, | |
237 | .nlgroup = RTNLGRP_IPV4_RULE, | |
238 | .policy = ipmr_rule_policy, | |
239 | .owner = THIS_MODULE, | |
240 | }; | |
241 | ||
242 | static int __net_init ipmr_rules_init(struct net *net) | |
243 | { | |
244 | struct fib_rules_ops *ops; | |
245 | struct mr_table *mrt; | |
246 | int err; | |
247 | ||
248 | ops = fib_rules_register(&ipmr_rules_ops_template, net); | |
249 | if (IS_ERR(ops)) | |
250 | return PTR_ERR(ops); | |
251 | ||
252 | INIT_LIST_HEAD(&net->ipv4.mr_tables); | |
253 | ||
254 | mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
255 | if (mrt == NULL) { | |
256 | err = -ENOMEM; | |
257 | goto err1; | |
258 | } | |
259 | ||
260 | err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); | |
261 | if (err < 0) | |
262 | goto err2; | |
263 | ||
264 | net->ipv4.mr_rules_ops = ops; | |
265 | return 0; | |
266 | ||
267 | err2: | |
268 | kfree(mrt); | |
269 | err1: | |
270 | fib_rules_unregister(ops); | |
271 | return err; | |
272 | } | |
273 | ||
274 | static void __net_exit ipmr_rules_exit(struct net *net) | |
275 | { | |
276 | struct mr_table *mrt, *next; | |
277 | ||
035320d5 ED |
278 | list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { |
279 | list_del(&mrt->list); | |
acbb219d | 280 | ipmr_free_table(mrt); |
035320d5 | 281 | } |
f0ad0860 PM |
282 | fib_rules_unregister(net->ipv4.mr_rules_ops); |
283 | } | |
284 | #else | |
285 | #define ipmr_for_each_table(mrt, net) \ | |
286 | for (mrt = net->ipv4.mrt; mrt; mrt = NULL) | |
287 | ||
288 | static struct mr_table *ipmr_get_table(struct net *net, u32 id) | |
289 | { | |
290 | return net->ipv4.mrt; | |
291 | } | |
292 | ||
da91981b | 293 | static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, |
f0ad0860 PM |
294 | struct mr_table **mrt) |
295 | { | |
296 | *mrt = net->ipv4.mrt; | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int __net_init ipmr_rules_init(struct net *net) | |
301 | { | |
302 | net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); | |
303 | return net->ipv4.mrt ? 0 : -ENOMEM; | |
304 | } | |
305 | ||
306 | static void __net_exit ipmr_rules_exit(struct net *net) | |
307 | { | |
acbb219d | 308 | ipmr_free_table(net->ipv4.mrt); |
f0ad0860 PM |
309 | } |
310 | #endif | |
311 | ||
312 | static struct mr_table *ipmr_new_table(struct net *net, u32 id) | |
313 | { | |
314 | struct mr_table *mrt; | |
315 | unsigned int i; | |
1da177e4 | 316 | |
f0ad0860 PM |
317 | mrt = ipmr_get_table(net, id); |
318 | if (mrt != NULL) | |
319 | return mrt; | |
320 | ||
321 | mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); | |
322 | if (mrt == NULL) | |
323 | return NULL; | |
8de53dfb | 324 | write_pnet(&mrt->net, net); |
f0ad0860 PM |
325 | mrt->id = id; |
326 | ||
327 | /* Forwarding cache */ | |
328 | for (i = 0; i < MFC_LINES; i++) | |
329 | INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); | |
330 | ||
331 | INIT_LIST_HEAD(&mrt->mfc_unres_queue); | |
332 | ||
333 | setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, | |
334 | (unsigned long)mrt); | |
335 | ||
336 | #ifdef CONFIG_IP_PIMSM | |
337 | mrt->mroute_reg_vif_num = -1; | |
338 | #endif | |
339 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
340 | list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); | |
341 | #endif | |
342 | return mrt; | |
343 | } | |
1da177e4 | 344 | |
acbb219d FR |
345 | static void ipmr_free_table(struct mr_table *mrt) |
346 | { | |
347 | del_timer_sync(&mrt->ipmr_expire_timer); | |
348 | mroute_clean_tables(mrt); | |
349 | kfree(mrt); | |
350 | } | |
351 | ||
1da177e4 LT |
352 | /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ |
353 | ||
d607032d WC |
354 | static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) |
355 | { | |
4feb88e5 BT |
356 | struct net *net = dev_net(dev); |
357 | ||
d607032d WC |
358 | dev_close(dev); |
359 | ||
4feb88e5 | 360 | dev = __dev_get_by_name(net, "tunl0"); |
d607032d | 361 | if (dev) { |
5bc3eb7e | 362 | const struct net_device_ops *ops = dev->netdev_ops; |
d607032d | 363 | struct ifreq ifr; |
d607032d WC |
364 | struct ip_tunnel_parm p; |
365 | ||
366 | memset(&p, 0, sizeof(p)); | |
367 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
368 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
369 | p.iph.version = 4; | |
370 | p.iph.ihl = 5; | |
371 | p.iph.protocol = IPPROTO_IPIP; | |
372 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
373 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; | |
374 | ||
5bc3eb7e SH |
375 | if (ops->ndo_do_ioctl) { |
376 | mm_segment_t oldfs = get_fs(); | |
377 | ||
378 | set_fs(KERNEL_DS); | |
379 | ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); | |
380 | set_fs(oldfs); | |
381 | } | |
d607032d WC |
382 | } |
383 | } | |
384 | ||
1da177e4 | 385 | static |
4feb88e5 | 386 | struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) |
1da177e4 LT |
387 | { |
388 | struct net_device *dev; | |
389 | ||
4feb88e5 | 390 | dev = __dev_get_by_name(net, "tunl0"); |
1da177e4 LT |
391 | |
392 | if (dev) { | |
5bc3eb7e | 393 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
394 | int err; |
395 | struct ifreq ifr; | |
1da177e4 LT |
396 | struct ip_tunnel_parm p; |
397 | struct in_device *in_dev; | |
398 | ||
399 | memset(&p, 0, sizeof(p)); | |
400 | p.iph.daddr = v->vifc_rmt_addr.s_addr; | |
401 | p.iph.saddr = v->vifc_lcl_addr.s_addr; | |
402 | p.iph.version = 4; | |
403 | p.iph.ihl = 5; | |
404 | p.iph.protocol = IPPROTO_IPIP; | |
405 | sprintf(p.name, "dvmrp%d", v->vifc_vifi); | |
ba93ef74 | 406 | ifr.ifr_ifru.ifru_data = (__force void __user *)&p; |
1da177e4 | 407 | |
5bc3eb7e SH |
408 | if (ops->ndo_do_ioctl) { |
409 | mm_segment_t oldfs = get_fs(); | |
410 | ||
411 | set_fs(KERNEL_DS); | |
412 | err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); | |
413 | set_fs(oldfs); | |
a8cb16dd | 414 | } else { |
5bc3eb7e | 415 | err = -EOPNOTSUPP; |
a8cb16dd | 416 | } |
1da177e4 LT |
417 | dev = NULL; |
418 | ||
4feb88e5 BT |
419 | if (err == 0 && |
420 | (dev = __dev_get_by_name(net, p.name)) != NULL) { | |
1da177e4 LT |
421 | dev->flags |= IFF_MULTICAST; |
422 | ||
e5ed6399 | 423 | in_dev = __in_dev_get_rtnl(dev); |
71e27da9 | 424 | if (in_dev == NULL) |
1da177e4 | 425 | goto failure; |
71e27da9 HX |
426 | |
427 | ipv4_devconf_setall(in_dev); | |
428 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
1da177e4 LT |
429 | |
430 | if (dev_open(dev)) | |
431 | goto failure; | |
7dc00c82 | 432 | dev_hold(dev); |
1da177e4 LT |
433 | } |
434 | } | |
435 | return dev; | |
436 | ||
437 | failure: | |
438 | /* allow the register to be completed before unregistering. */ | |
439 | rtnl_unlock(); | |
440 | rtnl_lock(); | |
441 | ||
442 | unregister_netdevice(dev); | |
443 | return NULL; | |
444 | } | |
445 | ||
446 | #ifdef CONFIG_IP_PIMSM | |
447 | ||
6fef4c0c | 448 | static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 449 | { |
4feb88e5 | 450 | struct net *net = dev_net(dev); |
f0ad0860 | 451 | struct mr_table *mrt; |
da91981b DM |
452 | struct flowi4 fl4 = { |
453 | .flowi4_oif = dev->ifindex, | |
454 | .flowi4_iif = skb->skb_iif, | |
455 | .flowi4_mark = skb->mark, | |
f0ad0860 PM |
456 | }; |
457 | int err; | |
458 | ||
da91981b | 459 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
e40dbc51 BG |
460 | if (err < 0) { |
461 | kfree_skb(skb); | |
f0ad0860 | 462 | return err; |
e40dbc51 | 463 | } |
4feb88e5 | 464 | |
1da177e4 | 465 | read_lock(&mrt_lock); |
cf3677ae PE |
466 | dev->stats.tx_bytes += skb->len; |
467 | dev->stats.tx_packets++; | |
0c12295a | 468 | ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); |
1da177e4 LT |
469 | read_unlock(&mrt_lock); |
470 | kfree_skb(skb); | |
6ed10654 | 471 | return NETDEV_TX_OK; |
1da177e4 LT |
472 | } |
473 | ||
007c3838 SH |
474 | static const struct net_device_ops reg_vif_netdev_ops = { |
475 | .ndo_start_xmit = reg_vif_xmit, | |
476 | }; | |
477 | ||
1da177e4 LT |
478 | static void reg_vif_setup(struct net_device *dev) |
479 | { | |
480 | dev->type = ARPHRD_PIMREG; | |
46f25dff | 481 | dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; |
1da177e4 | 482 | dev->flags = IFF_NOARP; |
007c3838 | 483 | dev->netdev_ops = ®_vif_netdev_ops, |
1da177e4 | 484 | dev->destructor = free_netdev; |
403dbb97 | 485 | dev->features |= NETIF_F_NETNS_LOCAL; |
1da177e4 LT |
486 | } |
487 | ||
f0ad0860 | 488 | static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) |
1da177e4 LT |
489 | { |
490 | struct net_device *dev; | |
491 | struct in_device *in_dev; | |
f0ad0860 | 492 | char name[IFNAMSIZ]; |
1da177e4 | 493 | |
f0ad0860 PM |
494 | if (mrt->id == RT_TABLE_DEFAULT) |
495 | sprintf(name, "pimreg"); | |
496 | else | |
497 | sprintf(name, "pimreg%u", mrt->id); | |
1da177e4 | 498 | |
f0ad0860 | 499 | dev = alloc_netdev(0, name, reg_vif_setup); |
1da177e4 LT |
500 | |
501 | if (dev == NULL) | |
502 | return NULL; | |
503 | ||
403dbb97 TG |
504 | dev_net_set(dev, net); |
505 | ||
1da177e4 LT |
506 | if (register_netdevice(dev)) { |
507 | free_netdev(dev); | |
508 | return NULL; | |
509 | } | |
510 | dev->iflink = 0; | |
511 | ||
71e27da9 | 512 | rcu_read_lock(); |
a8cb16dd ED |
513 | in_dev = __in_dev_get_rcu(dev); |
514 | if (!in_dev) { | |
71e27da9 | 515 | rcu_read_unlock(); |
1da177e4 | 516 | goto failure; |
71e27da9 | 517 | } |
1da177e4 | 518 | |
71e27da9 HX |
519 | ipv4_devconf_setall(in_dev); |
520 | IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; | |
521 | rcu_read_unlock(); | |
1da177e4 LT |
522 | |
523 | if (dev_open(dev)) | |
524 | goto failure; | |
525 | ||
7dc00c82 WC |
526 | dev_hold(dev); |
527 | ||
1da177e4 LT |
528 | return dev; |
529 | ||
530 | failure: | |
531 | /* allow the register to be completed before unregistering. */ | |
532 | rtnl_unlock(); | |
533 | rtnl_lock(); | |
534 | ||
535 | unregister_netdevice(dev); | |
536 | return NULL; | |
537 | } | |
538 | #endif | |
539 | ||
2c53040f BH |
540 | /** |
541 | * vif_delete - Delete a VIF entry | |
7dc00c82 | 542 | * @notify: Set to 1, if the caller is a notifier_call |
1da177e4 | 543 | */ |
e905a9ed | 544 | |
0c12295a | 545 | static int vif_delete(struct mr_table *mrt, int vifi, int notify, |
d17fa6fa | 546 | struct list_head *head) |
1da177e4 LT |
547 | { |
548 | struct vif_device *v; | |
549 | struct net_device *dev; | |
550 | struct in_device *in_dev; | |
551 | ||
0c12295a | 552 | if (vifi < 0 || vifi >= mrt->maxvif) |
1da177e4 LT |
553 | return -EADDRNOTAVAIL; |
554 | ||
0c12295a | 555 | v = &mrt->vif_table[vifi]; |
1da177e4 LT |
556 | |
557 | write_lock_bh(&mrt_lock); | |
558 | dev = v->dev; | |
559 | v->dev = NULL; | |
560 | ||
561 | if (!dev) { | |
562 | write_unlock_bh(&mrt_lock); | |
563 | return -EADDRNOTAVAIL; | |
564 | } | |
565 | ||
566 | #ifdef CONFIG_IP_PIMSM | |
0c12295a PM |
567 | if (vifi == mrt->mroute_reg_vif_num) |
568 | mrt->mroute_reg_vif_num = -1; | |
1da177e4 LT |
569 | #endif |
570 | ||
a8cb16dd | 571 | if (vifi + 1 == mrt->maxvif) { |
1da177e4 | 572 | int tmp; |
a8cb16dd ED |
573 | |
574 | for (tmp = vifi - 1; tmp >= 0; tmp--) { | |
0c12295a | 575 | if (VIF_EXISTS(mrt, tmp)) |
1da177e4 LT |
576 | break; |
577 | } | |
0c12295a | 578 | mrt->maxvif = tmp+1; |
1da177e4 LT |
579 | } |
580 | ||
581 | write_unlock_bh(&mrt_lock); | |
582 | ||
583 | dev_set_allmulti(dev, -1); | |
584 | ||
a8cb16dd ED |
585 | in_dev = __in_dev_get_rtnl(dev); |
586 | if (in_dev) { | |
42f811b8 | 587 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; |
d67b8c61 ND |
588 | inet_netconf_notify_devconf(dev_net(dev), |
589 | NETCONFA_MC_FORWARDING, | |
590 | dev->ifindex, &in_dev->cnf); | |
1da177e4 LT |
591 | ip_rt_multicast_event(in_dev); |
592 | } | |
593 | ||
a8cb16dd | 594 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) |
d17fa6fa | 595 | unregister_netdevice_queue(dev, head); |
1da177e4 LT |
596 | |
597 | dev_put(dev); | |
598 | return 0; | |
599 | } | |
600 | ||
a8c9486b | 601 | static void ipmr_cache_free_rcu(struct rcu_head *head) |
5c0a66f5 | 602 | { |
a8c9486b ED |
603 | struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); |
604 | ||
5c0a66f5 BT |
605 | kmem_cache_free(mrt_cachep, c); |
606 | } | |
607 | ||
a8c9486b ED |
608 | static inline void ipmr_cache_free(struct mfc_cache *c) |
609 | { | |
610 | call_rcu(&c->rcu, ipmr_cache_free_rcu); | |
611 | } | |
612 | ||
1da177e4 | 613 | /* Destroy an unresolved cache entry, killing queued skbs |
a8cb16dd | 614 | * and reporting error to netlink readers. |
1da177e4 LT |
615 | */ |
616 | ||
0c12295a | 617 | static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) |
1da177e4 | 618 | { |
8de53dfb | 619 | struct net *net = read_pnet(&mrt->net); |
1da177e4 | 620 | struct sk_buff *skb; |
9ef1d4c7 | 621 | struct nlmsgerr *e; |
1da177e4 | 622 | |
0c12295a | 623 | atomic_dec(&mrt->cache_resolve_queue_len); |
1da177e4 | 624 | |
c354e124 | 625 | while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { |
eddc9ec5 | 626 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
627 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
628 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 629 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 630 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 631 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
632 | e->error = -ETIMEDOUT; |
633 | memset(&e->msg, 0, sizeof(e->msg)); | |
2942e900 | 634 | |
15e47304 | 635 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 636 | } else { |
1da177e4 | 637 | kfree_skb(skb); |
a8cb16dd | 638 | } |
1da177e4 LT |
639 | } |
640 | ||
5c0a66f5 | 641 | ipmr_cache_free(c); |
1da177e4 LT |
642 | } |
643 | ||
644 | ||
e258beb2 | 645 | /* Timer process for the unresolved queue. */ |
1da177e4 | 646 | |
e258beb2 | 647 | static void ipmr_expire_process(unsigned long arg) |
1da177e4 | 648 | { |
0c12295a | 649 | struct mr_table *mrt = (struct mr_table *)arg; |
1da177e4 LT |
650 | unsigned long now; |
651 | unsigned long expires; | |
862465f2 | 652 | struct mfc_cache *c, *next; |
1da177e4 LT |
653 | |
654 | if (!spin_trylock(&mfc_unres_lock)) { | |
0c12295a | 655 | mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); |
1da177e4 LT |
656 | return; |
657 | } | |
658 | ||
0c12295a | 659 | if (list_empty(&mrt->mfc_unres_queue)) |
1da177e4 LT |
660 | goto out; |
661 | ||
662 | now = jiffies; | |
663 | expires = 10*HZ; | |
1da177e4 | 664 | |
0c12295a | 665 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
1da177e4 LT |
666 | if (time_after(c->mfc_un.unres.expires, now)) { |
667 | unsigned long interval = c->mfc_un.unres.expires - now; | |
668 | if (interval < expires) | |
669 | expires = interval; | |
1da177e4 LT |
670 | continue; |
671 | } | |
672 | ||
862465f2 | 673 | list_del(&c->list); |
8cd3ac9f | 674 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 675 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
676 | } |
677 | ||
0c12295a PM |
678 | if (!list_empty(&mrt->mfc_unres_queue)) |
679 | mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); | |
1da177e4 LT |
680 | |
681 | out: | |
682 | spin_unlock(&mfc_unres_lock); | |
683 | } | |
684 | ||
685 | /* Fill oifs list. It is called under write locked mrt_lock. */ | |
686 | ||
0c12295a | 687 | static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, |
d658f8a0 | 688 | unsigned char *ttls) |
1da177e4 LT |
689 | { |
690 | int vifi; | |
691 | ||
692 | cache->mfc_un.res.minvif = MAXVIFS; | |
693 | cache->mfc_un.res.maxvif = 0; | |
694 | memset(cache->mfc_un.res.ttls, 255, MAXVIFS); | |
695 | ||
0c12295a PM |
696 | for (vifi = 0; vifi < mrt->maxvif; vifi++) { |
697 | if (VIF_EXISTS(mrt, vifi) && | |
cf958ae3 | 698 | ttls[vifi] && ttls[vifi] < 255) { |
1da177e4 LT |
699 | cache->mfc_un.res.ttls[vifi] = ttls[vifi]; |
700 | if (cache->mfc_un.res.minvif > vifi) | |
701 | cache->mfc_un.res.minvif = vifi; | |
702 | if (cache->mfc_un.res.maxvif <= vifi) | |
703 | cache->mfc_un.res.maxvif = vifi + 1; | |
704 | } | |
705 | } | |
706 | } | |
707 | ||
0c12295a PM |
708 | static int vif_add(struct net *net, struct mr_table *mrt, |
709 | struct vifctl *vifc, int mrtsock) | |
1da177e4 LT |
710 | { |
711 | int vifi = vifc->vifc_vifi; | |
0c12295a | 712 | struct vif_device *v = &mrt->vif_table[vifi]; |
1da177e4 LT |
713 | struct net_device *dev; |
714 | struct in_device *in_dev; | |
d607032d | 715 | int err; |
1da177e4 LT |
716 | |
717 | /* Is vif busy ? */ | |
0c12295a | 718 | if (VIF_EXISTS(mrt, vifi)) |
1da177e4 LT |
719 | return -EADDRINUSE; |
720 | ||
721 | switch (vifc->vifc_flags) { | |
722 | #ifdef CONFIG_IP_PIMSM | |
723 | case VIFF_REGISTER: | |
724 | /* | |
725 | * Special Purpose VIF in PIM | |
726 | * All the packets will be sent to the daemon | |
727 | */ | |
0c12295a | 728 | if (mrt->mroute_reg_vif_num >= 0) |
1da177e4 | 729 | return -EADDRINUSE; |
f0ad0860 | 730 | dev = ipmr_reg_vif(net, mrt); |
1da177e4 LT |
731 | if (!dev) |
732 | return -ENOBUFS; | |
d607032d WC |
733 | err = dev_set_allmulti(dev, 1); |
734 | if (err) { | |
735 | unregister_netdevice(dev); | |
7dc00c82 | 736 | dev_put(dev); |
d607032d WC |
737 | return err; |
738 | } | |
1da177e4 LT |
739 | break; |
740 | #endif | |
e905a9ed | 741 | case VIFF_TUNNEL: |
4feb88e5 | 742 | dev = ipmr_new_tunnel(net, vifc); |
1da177e4 LT |
743 | if (!dev) |
744 | return -ENOBUFS; | |
d607032d WC |
745 | err = dev_set_allmulti(dev, 1); |
746 | if (err) { | |
747 | ipmr_del_tunnel(dev, vifc); | |
7dc00c82 | 748 | dev_put(dev); |
d607032d WC |
749 | return err; |
750 | } | |
1da177e4 | 751 | break; |
ee5e81f0 I |
752 | |
753 | case VIFF_USE_IFINDEX: | |
1da177e4 | 754 | case 0: |
ee5e81f0 I |
755 | if (vifc->vifc_flags == VIFF_USE_IFINDEX) { |
756 | dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); | |
95ae6b22 | 757 | if (dev && __in_dev_get_rtnl(dev) == NULL) { |
ee5e81f0 I |
758 | dev_put(dev); |
759 | return -EADDRNOTAVAIL; | |
760 | } | |
a8cb16dd | 761 | } else { |
ee5e81f0 | 762 | dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); |
a8cb16dd | 763 | } |
1da177e4 LT |
764 | if (!dev) |
765 | return -EADDRNOTAVAIL; | |
d607032d | 766 | err = dev_set_allmulti(dev, 1); |
7dc00c82 WC |
767 | if (err) { |
768 | dev_put(dev); | |
d607032d | 769 | return err; |
7dc00c82 | 770 | } |
1da177e4 LT |
771 | break; |
772 | default: | |
773 | return -EINVAL; | |
774 | } | |
775 | ||
a8cb16dd ED |
776 | in_dev = __in_dev_get_rtnl(dev); |
777 | if (!in_dev) { | |
d0490cfd | 778 | dev_put(dev); |
1da177e4 | 779 | return -EADDRNOTAVAIL; |
d0490cfd | 780 | } |
42f811b8 | 781 | IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; |
d67b8c61 ND |
782 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, dev->ifindex, |
783 | &in_dev->cnf); | |
1da177e4 LT |
784 | ip_rt_multicast_event(in_dev); |
785 | ||
a8cb16dd ED |
786 | /* Fill in the VIF structures */ |
787 | ||
c354e124 JK |
788 | v->rate_limit = vifc->vifc_rate_limit; |
789 | v->local = vifc->vifc_lcl_addr.s_addr; | |
790 | v->remote = vifc->vifc_rmt_addr.s_addr; | |
791 | v->flags = vifc->vifc_flags; | |
1da177e4 LT |
792 | if (!mrtsock) |
793 | v->flags |= VIFF_STATIC; | |
c354e124 | 794 | v->threshold = vifc->vifc_threshold; |
1da177e4 LT |
795 | v->bytes_in = 0; |
796 | v->bytes_out = 0; | |
797 | v->pkt_in = 0; | |
798 | v->pkt_out = 0; | |
799 | v->link = dev->ifindex; | |
a8cb16dd | 800 | if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) |
1da177e4 LT |
801 | v->link = dev->iflink; |
802 | ||
803 | /* And finish update writing critical data */ | |
804 | write_lock_bh(&mrt_lock); | |
c354e124 | 805 | v->dev = dev; |
1da177e4 | 806 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 807 | if (v->flags & VIFF_REGISTER) |
0c12295a | 808 | mrt->mroute_reg_vif_num = vifi; |
1da177e4 | 809 | #endif |
0c12295a PM |
810 | if (vifi+1 > mrt->maxvif) |
811 | mrt->maxvif = vifi+1; | |
1da177e4 LT |
812 | write_unlock_bh(&mrt_lock); |
813 | return 0; | |
814 | } | |
815 | ||
a8c9486b | 816 | /* called with rcu_read_lock() */ |
0c12295a | 817 | static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, |
4feb88e5 BT |
818 | __be32 origin, |
819 | __be32 mcastgrp) | |
1da177e4 | 820 | { |
c354e124 | 821 | int line = MFC_HASH(mcastgrp, origin); |
1da177e4 LT |
822 | struct mfc_cache *c; |
823 | ||
a8c9486b | 824 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { |
862465f2 PM |
825 | if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) |
826 | return c; | |
1da177e4 | 827 | } |
862465f2 | 828 | return NULL; |
1da177e4 LT |
829 | } |
830 | ||
660b26dc ND |
831 | /* Look for a (*,*,oif) entry */ |
832 | static struct mfc_cache *ipmr_cache_find_any_parent(struct mr_table *mrt, | |
833 | int vifi) | |
834 | { | |
360eb5da | 835 | int line = MFC_HASH(htonl(INADDR_ANY), htonl(INADDR_ANY)); |
660b26dc ND |
836 | struct mfc_cache *c; |
837 | ||
838 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da ND |
839 | if (c->mfc_origin == htonl(INADDR_ANY) && |
840 | c->mfc_mcastgrp == htonl(INADDR_ANY) && | |
660b26dc ND |
841 | c->mfc_un.res.ttls[vifi] < 255) |
842 | return c; | |
843 | ||
844 | return NULL; | |
845 | } | |
846 | ||
847 | /* Look for a (*,G) entry */ | |
848 | static struct mfc_cache *ipmr_cache_find_any(struct mr_table *mrt, | |
849 | __be32 mcastgrp, int vifi) | |
850 | { | |
360eb5da | 851 | int line = MFC_HASH(mcastgrp, htonl(INADDR_ANY)); |
660b26dc ND |
852 | struct mfc_cache *c, *proxy; |
853 | ||
360eb5da | 854 | if (mcastgrp == htonl(INADDR_ANY)) |
660b26dc ND |
855 | goto skip; |
856 | ||
857 | list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) | |
360eb5da | 858 | if (c->mfc_origin == htonl(INADDR_ANY) && |
660b26dc ND |
859 | c->mfc_mcastgrp == mcastgrp) { |
860 | if (c->mfc_un.res.ttls[vifi] < 255) | |
861 | return c; | |
862 | ||
863 | /* It's ok if the vifi is part of the static tree */ | |
864 | proxy = ipmr_cache_find_any_parent(mrt, | |
865 | c->mfc_parent); | |
866 | if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) | |
867 | return c; | |
868 | } | |
869 | ||
870 | skip: | |
871 | return ipmr_cache_find_any_parent(mrt, vifi); | |
872 | } | |
873 | ||
1da177e4 LT |
874 | /* |
875 | * Allocate a multicast cache entry | |
876 | */ | |
d658f8a0 | 877 | static struct mfc_cache *ipmr_cache_alloc(void) |
1da177e4 | 878 | { |
c354e124 | 879 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); |
a8c9486b ED |
880 | |
881 | if (c) | |
882 | c->mfc_un.res.minvif = MAXVIFS; | |
1da177e4 LT |
883 | return c; |
884 | } | |
885 | ||
d658f8a0 | 886 | static struct mfc_cache *ipmr_cache_alloc_unres(void) |
1da177e4 | 887 | { |
c354e124 | 888 | struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); |
a8c9486b ED |
889 | |
890 | if (c) { | |
891 | skb_queue_head_init(&c->mfc_un.unres.unresolved); | |
892 | c->mfc_un.unres.expires = jiffies + 10*HZ; | |
893 | } | |
1da177e4 LT |
894 | return c; |
895 | } | |
896 | ||
897 | /* | |
898 | * A cache entry has gone into a resolved state from queued | |
899 | */ | |
e905a9ed | 900 | |
0c12295a PM |
901 | static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, |
902 | struct mfc_cache *uc, struct mfc_cache *c) | |
1da177e4 LT |
903 | { |
904 | struct sk_buff *skb; | |
9ef1d4c7 | 905 | struct nlmsgerr *e; |
1da177e4 | 906 | |
a8cb16dd | 907 | /* Play the pending entries through our router */ |
1da177e4 | 908 | |
c354e124 | 909 | while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { |
eddc9ec5 | 910 | if (ip_hdr(skb)->version == 0) { |
1da177e4 LT |
911 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); |
912 | ||
573ce260 | 913 | if (__ipmr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) { |
a8cb16dd ED |
914 | nlh->nlmsg_len = skb_tail_pointer(skb) - |
915 | (u8 *)nlh; | |
1da177e4 LT |
916 | } else { |
917 | nlh->nlmsg_type = NLMSG_ERROR; | |
573ce260 | 918 | nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); |
1da177e4 | 919 | skb_trim(skb, nlh->nlmsg_len); |
573ce260 | 920 | e = nlmsg_data(nlh); |
9ef1d4c7 PM |
921 | e->error = -EMSGSIZE; |
922 | memset(&e->msg, 0, sizeof(e->msg)); | |
1da177e4 | 923 | } |
2942e900 | 924 | |
15e47304 | 925 | rtnl_unicast(skb, net, NETLINK_CB(skb).portid); |
a8cb16dd | 926 | } else { |
0c12295a | 927 | ip_mr_forward(net, mrt, skb, c, 0); |
a8cb16dd | 928 | } |
1da177e4 LT |
929 | } |
930 | } | |
931 | ||
932 | /* | |
933 | * Bounce a cache query up to mrouted. We could use netlink for this but mrouted | |
934 | * expects the following bizarre scheme. | |
935 | * | |
936 | * Called under mrt_lock. | |
937 | */ | |
e905a9ed | 938 | |
0c12295a | 939 | static int ipmr_cache_report(struct mr_table *mrt, |
4feb88e5 | 940 | struct sk_buff *pkt, vifi_t vifi, int assert) |
1da177e4 LT |
941 | { |
942 | struct sk_buff *skb; | |
c9bdd4b5 | 943 | const int ihl = ip_hdrlen(pkt); |
1da177e4 LT |
944 | struct igmphdr *igmp; |
945 | struct igmpmsg *msg; | |
4c968709 | 946 | struct sock *mroute_sk; |
1da177e4 LT |
947 | int ret; |
948 | ||
949 | #ifdef CONFIG_IP_PIMSM | |
950 | if (assert == IGMPMSG_WHOLEPKT) | |
951 | skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); | |
952 | else | |
953 | #endif | |
954 | skb = alloc_skb(128, GFP_ATOMIC); | |
955 | ||
132adf54 | 956 | if (!skb) |
1da177e4 LT |
957 | return -ENOBUFS; |
958 | ||
959 | #ifdef CONFIG_IP_PIMSM | |
960 | if (assert == IGMPMSG_WHOLEPKT) { | |
961 | /* Ugly, but we have no choice with this interface. | |
a8cb16dd ED |
962 | * Duplicate old header, fix ihl, length etc. |
963 | * And all this only to mangle msg->im_msgtype and | |
964 | * to set msg->im_mbz to "mbz" :-) | |
1da177e4 | 965 | */ |
878c8145 ACM |
966 | skb_push(skb, sizeof(struct iphdr)); |
967 | skb_reset_network_header(skb); | |
badff6d0 | 968 | skb_reset_transport_header(skb); |
0272ffc4 | 969 | msg = (struct igmpmsg *)skb_network_header(skb); |
d56f90a7 | 970 | memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); |
1da177e4 LT |
971 | msg->im_msgtype = IGMPMSG_WHOLEPKT; |
972 | msg->im_mbz = 0; | |
0c12295a | 973 | msg->im_vif = mrt->mroute_reg_vif_num; |
eddc9ec5 ACM |
974 | ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; |
975 | ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + | |
976 | sizeof(struct iphdr)); | |
e905a9ed | 977 | } else |
1da177e4 | 978 | #endif |
e905a9ed YH |
979 | { |
980 | ||
a8cb16dd | 981 | /* Copy the IP header */ |
1da177e4 | 982 | |
30f3a40f | 983 | skb_set_network_header(skb, skb->len); |
ddc7b8e3 | 984 | skb_put(skb, ihl); |
27d7ff46 | 985 | skb_copy_to_linear_data(skb, pkt->data, ihl); |
a8cb16dd | 986 | ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ |
eddc9ec5 | 987 | msg = (struct igmpmsg *)skb_network_header(skb); |
1da177e4 | 988 | msg->im_vif = vifi; |
adf30907 | 989 | skb_dst_set(skb, dst_clone(skb_dst(pkt))); |
1da177e4 | 990 | |
a8cb16dd | 991 | /* Add our header */ |
1da177e4 | 992 | |
a8cb16dd | 993 | igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); |
1da177e4 LT |
994 | igmp->type = |
995 | msg->im_msgtype = assert; | |
a8cb16dd ED |
996 | igmp->code = 0; |
997 | ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ | |
b0e380b1 | 998 | skb->transport_header = skb->network_header; |
e905a9ed | 999 | } |
1da177e4 | 1000 | |
4c968709 ED |
1001 | rcu_read_lock(); |
1002 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1003 | if (mroute_sk == NULL) { | |
1004 | rcu_read_unlock(); | |
1da177e4 LT |
1005 | kfree_skb(skb); |
1006 | return -EINVAL; | |
1007 | } | |
1008 | ||
a8cb16dd ED |
1009 | /* Deliver to mrouted */ |
1010 | ||
4c968709 ED |
1011 | ret = sock_queue_rcv_skb(mroute_sk, skb); |
1012 | rcu_read_unlock(); | |
70a269e6 | 1013 | if (ret < 0) { |
e87cc472 | 1014 | net_warn_ratelimited("mroute: pending queue full, dropping entries\n"); |
1da177e4 LT |
1015 | kfree_skb(skb); |
1016 | } | |
1017 | ||
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Queue a packet for resolution. It gets locked cache entry! | |
1023 | */ | |
e905a9ed | 1024 | |
1da177e4 | 1025 | static int |
0c12295a | 1026 | ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) |
1da177e4 | 1027 | { |
862465f2 | 1028 | bool found = false; |
1da177e4 LT |
1029 | int err; |
1030 | struct mfc_cache *c; | |
eddc9ec5 | 1031 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
1032 | |
1033 | spin_lock_bh(&mfc_unres_lock); | |
0c12295a | 1034 | list_for_each_entry(c, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1035 | if (c->mfc_mcastgrp == iph->daddr && |
862465f2 PM |
1036 | c->mfc_origin == iph->saddr) { |
1037 | found = true; | |
1da177e4 | 1038 | break; |
862465f2 | 1039 | } |
1da177e4 LT |
1040 | } |
1041 | ||
862465f2 | 1042 | if (!found) { |
a8cb16dd | 1043 | /* Create a new entry if allowable */ |
1da177e4 | 1044 | |
0c12295a | 1045 | if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || |
d658f8a0 | 1046 | (c = ipmr_cache_alloc_unres()) == NULL) { |
1da177e4 LT |
1047 | spin_unlock_bh(&mfc_unres_lock); |
1048 | ||
1049 | kfree_skb(skb); | |
1050 | return -ENOBUFS; | |
1051 | } | |
1052 | ||
a8cb16dd ED |
1053 | /* Fill in the new cache entry */ |
1054 | ||
eddc9ec5 ACM |
1055 | c->mfc_parent = -1; |
1056 | c->mfc_origin = iph->saddr; | |
1057 | c->mfc_mcastgrp = iph->daddr; | |
1da177e4 | 1058 | |
a8cb16dd ED |
1059 | /* Reflect first query at mrouted. */ |
1060 | ||
0c12295a | 1061 | err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); |
4feb88e5 | 1062 | if (err < 0) { |
e905a9ed | 1063 | /* If the report failed throw the cache entry |
1da177e4 LT |
1064 | out - Brad Parker |
1065 | */ | |
1066 | spin_unlock_bh(&mfc_unres_lock); | |
1067 | ||
5c0a66f5 | 1068 | ipmr_cache_free(c); |
1da177e4 LT |
1069 | kfree_skb(skb); |
1070 | return err; | |
1071 | } | |
1072 | ||
0c12295a PM |
1073 | atomic_inc(&mrt->cache_resolve_queue_len); |
1074 | list_add(&c->list, &mrt->mfc_unres_queue); | |
8cd3ac9f | 1075 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 | 1076 | |
278554bd DM |
1077 | if (atomic_read(&mrt->cache_resolve_queue_len) == 1) |
1078 | mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); | |
1da177e4 LT |
1079 | } |
1080 | ||
a8cb16dd ED |
1081 | /* See if we can append the packet */ |
1082 | ||
1083 | if (c->mfc_un.unres.unresolved.qlen > 3) { | |
1da177e4 LT |
1084 | kfree_skb(skb); |
1085 | err = -ENOBUFS; | |
1086 | } else { | |
c354e124 | 1087 | skb_queue_tail(&c->mfc_un.unres.unresolved, skb); |
1da177e4 LT |
1088 | err = 0; |
1089 | } | |
1090 | ||
1091 | spin_unlock_bh(&mfc_unres_lock); | |
1092 | return err; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * MFC cache manipulation by user space mroute daemon | |
1097 | */ | |
1098 | ||
660b26dc | 1099 | static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc, int parent) |
1da177e4 LT |
1100 | { |
1101 | int line; | |
862465f2 | 1102 | struct mfc_cache *c, *next; |
1da177e4 | 1103 | |
c354e124 | 1104 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1105 | |
0c12295a | 1106 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1107 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1108 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1109 | (parent == -1 || parent == c->mfc_parent)) { | |
a8c9486b | 1110 | list_del_rcu(&c->list); |
8cd3ac9f | 1111 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1112 | ipmr_cache_free(c); |
1da177e4 LT |
1113 | return 0; |
1114 | } | |
1115 | } | |
1116 | return -ENOENT; | |
1117 | } | |
1118 | ||
0c12295a | 1119 | static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, |
660b26dc | 1120 | struct mfcctl *mfc, int mrtsock, int parent) |
1da177e4 | 1121 | { |
862465f2 | 1122 | bool found = false; |
1da177e4 | 1123 | int line; |
862465f2 | 1124 | struct mfc_cache *uc, *c; |
1da177e4 | 1125 | |
a50436f2 PM |
1126 | if (mfc->mfcc_parent >= MAXVIFS) |
1127 | return -ENFILE; | |
1128 | ||
c354e124 | 1129 | line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); |
1da177e4 | 1130 | |
0c12295a | 1131 | list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { |
1da177e4 | 1132 | if (c->mfc_origin == mfc->mfcc_origin.s_addr && |
660b26dc ND |
1133 | c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr && |
1134 | (parent == -1 || parent == c->mfc_parent)) { | |
862465f2 | 1135 | found = true; |
1da177e4 | 1136 | break; |
862465f2 | 1137 | } |
1da177e4 LT |
1138 | } |
1139 | ||
862465f2 | 1140 | if (found) { |
1da177e4 LT |
1141 | write_lock_bh(&mrt_lock); |
1142 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1143 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1144 | if (!mrtsock) |
1145 | c->mfc_flags |= MFC_STATIC; | |
1146 | write_unlock_bh(&mrt_lock); | |
8cd3ac9f | 1147 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1148 | return 0; |
1149 | } | |
1150 | ||
360eb5da | 1151 | if (mfc->mfcc_mcastgrp.s_addr != htonl(INADDR_ANY) && |
660b26dc | 1152 | !ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) |
1da177e4 LT |
1153 | return -EINVAL; |
1154 | ||
d658f8a0 | 1155 | c = ipmr_cache_alloc(); |
c354e124 | 1156 | if (c == NULL) |
1da177e4 LT |
1157 | return -ENOMEM; |
1158 | ||
c354e124 JK |
1159 | c->mfc_origin = mfc->mfcc_origin.s_addr; |
1160 | c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; | |
1161 | c->mfc_parent = mfc->mfcc_parent; | |
0c12295a | 1162 | ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); |
1da177e4 LT |
1163 | if (!mrtsock) |
1164 | c->mfc_flags |= MFC_STATIC; | |
1165 | ||
a8c9486b | 1166 | list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); |
1da177e4 LT |
1167 | |
1168 | /* | |
1169 | * Check to see if we resolved a queued list. If so we | |
1170 | * need to send on the frames and tidy up. | |
1171 | */ | |
b0ebb739 | 1172 | found = false; |
1da177e4 | 1173 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1174 | list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { |
e258beb2 | 1175 | if (uc->mfc_origin == c->mfc_origin && |
1da177e4 | 1176 | uc->mfc_mcastgrp == c->mfc_mcastgrp) { |
862465f2 | 1177 | list_del(&uc->list); |
0c12295a | 1178 | atomic_dec(&mrt->cache_resolve_queue_len); |
b0ebb739 | 1179 | found = true; |
1da177e4 LT |
1180 | break; |
1181 | } | |
1182 | } | |
0c12295a PM |
1183 | if (list_empty(&mrt->mfc_unres_queue)) |
1184 | del_timer(&mrt->ipmr_expire_timer); | |
1da177e4 LT |
1185 | spin_unlock_bh(&mfc_unres_lock); |
1186 | ||
b0ebb739 | 1187 | if (found) { |
0c12295a | 1188 | ipmr_cache_resolve(net, mrt, uc, c); |
5c0a66f5 | 1189 | ipmr_cache_free(uc); |
1da177e4 | 1190 | } |
8cd3ac9f | 1191 | mroute_netlink_event(mrt, c, RTM_NEWROUTE); |
1da177e4 LT |
1192 | return 0; |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Close the multicast socket, and clear the vif tables etc | |
1197 | */ | |
e905a9ed | 1198 | |
0c12295a | 1199 | static void mroute_clean_tables(struct mr_table *mrt) |
1da177e4 LT |
1200 | { |
1201 | int i; | |
d17fa6fa | 1202 | LIST_HEAD(list); |
862465f2 | 1203 | struct mfc_cache *c, *next; |
e905a9ed | 1204 | |
a8cb16dd ED |
1205 | /* Shut down all active vif entries */ |
1206 | ||
0c12295a | 1207 | for (i = 0; i < mrt->maxvif; i++) { |
a8cb16dd | 1208 | if (!(mrt->vif_table[i].flags & VIFF_STATIC)) |
0c12295a | 1209 | vif_delete(mrt, i, 0, &list); |
1da177e4 | 1210 | } |
d17fa6fa | 1211 | unregister_netdevice_many(&list); |
1da177e4 | 1212 | |
a8cb16dd ED |
1213 | /* Wipe the cache */ |
1214 | ||
862465f2 | 1215 | for (i = 0; i < MFC_LINES; i++) { |
0c12295a | 1216 | list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { |
a8c9486b | 1217 | if (c->mfc_flags & MFC_STATIC) |
1da177e4 | 1218 | continue; |
a8c9486b | 1219 | list_del_rcu(&c->list); |
8cd3ac9f | 1220 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
5c0a66f5 | 1221 | ipmr_cache_free(c); |
1da177e4 LT |
1222 | } |
1223 | } | |
1224 | ||
0c12295a | 1225 | if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { |
1da177e4 | 1226 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 1227 | list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { |
862465f2 | 1228 | list_del(&c->list); |
8cd3ac9f | 1229 | mroute_netlink_event(mrt, c, RTM_DELROUTE); |
0c12295a | 1230 | ipmr_destroy_unres(mrt, c); |
1da177e4 LT |
1231 | } |
1232 | spin_unlock_bh(&mfc_unres_lock); | |
1233 | } | |
1234 | } | |
1235 | ||
4c968709 ED |
1236 | /* called from ip_ra_control(), before an RCU grace period, |
1237 | * we dont need to call synchronize_rcu() here | |
1238 | */ | |
1da177e4 LT |
1239 | static void mrtsock_destruct(struct sock *sk) |
1240 | { | |
4feb88e5 | 1241 | struct net *net = sock_net(sk); |
f0ad0860 | 1242 | struct mr_table *mrt; |
4feb88e5 | 1243 | |
1da177e4 | 1244 | rtnl_lock(); |
f0ad0860 | 1245 | ipmr_for_each_table(mrt, net) { |
4c968709 | 1246 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
f0ad0860 | 1247 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; |
d67b8c61 ND |
1248 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1249 | NETCONFA_IFINDEX_ALL, | |
1250 | net->ipv4.devconf_all); | |
a9b3cd7f | 1251 | RCU_INIT_POINTER(mrt->mroute_sk, NULL); |
f0ad0860 PM |
1252 | mroute_clean_tables(mrt); |
1253 | } | |
1da177e4 LT |
1254 | } |
1255 | rtnl_unlock(); | |
1256 | } | |
1257 | ||
1258 | /* | |
1259 | * Socket options and virtual interface manipulation. The whole | |
1260 | * virtual interface system is a complete heap, but unfortunately | |
1261 | * that's how BSD mrouted happens to think. Maybe one day with a proper | |
1262 | * MOSPF/PIM router set up we can clean this up. | |
1263 | */ | |
e905a9ed | 1264 | |
b7058842 | 1265 | int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) |
1da177e4 | 1266 | { |
660b26dc | 1267 | int ret, parent = 0; |
1da177e4 LT |
1268 | struct vifctl vif; |
1269 | struct mfcctl mfc; | |
4feb88e5 | 1270 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1271 | struct mr_table *mrt; |
1272 | ||
5e1859fb ED |
1273 | if (sk->sk_type != SOCK_RAW || |
1274 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1275 | return -EOPNOTSUPP; | |
1276 | ||
f0ad0860 PM |
1277 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
1278 | if (mrt == NULL) | |
1279 | return -ENOENT; | |
e905a9ed | 1280 | |
132adf54 | 1281 | if (optname != MRT_INIT) { |
33d480ce | 1282 | if (sk != rcu_access_pointer(mrt->mroute_sk) && |
52e804c6 | 1283 | !ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1284 | return -EACCES; |
1285 | } | |
1286 | ||
132adf54 SH |
1287 | switch (optname) { |
1288 | case MRT_INIT: | |
c354e124 | 1289 | if (optlen != sizeof(int)) |
5e1859fb | 1290 | return -EINVAL; |
1da177e4 | 1291 | |
132adf54 | 1292 | rtnl_lock(); |
4c968709 | 1293 | if (rtnl_dereference(mrt->mroute_sk)) { |
1da177e4 | 1294 | rtnl_unlock(); |
132adf54 SH |
1295 | return -EADDRINUSE; |
1296 | } | |
1297 | ||
1298 | ret = ip_ra_control(sk, 1, mrtsock_destruct); | |
1299 | if (ret == 0) { | |
cf778b00 | 1300 | rcu_assign_pointer(mrt->mroute_sk, sk); |
4feb88e5 | 1301 | IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; |
d67b8c61 ND |
1302 | inet_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING, |
1303 | NETCONFA_IFINDEX_ALL, | |
1304 | net->ipv4.devconf_all); | |
132adf54 SH |
1305 | } |
1306 | rtnl_unlock(); | |
1307 | return ret; | |
1308 | case MRT_DONE: | |
33d480ce | 1309 | if (sk != rcu_access_pointer(mrt->mroute_sk)) |
132adf54 SH |
1310 | return -EACCES; |
1311 | return ip_ra_control(sk, 0, NULL); | |
1312 | case MRT_ADD_VIF: | |
1313 | case MRT_DEL_VIF: | |
c354e124 | 1314 | if (optlen != sizeof(vif)) |
132adf54 | 1315 | return -EINVAL; |
c354e124 | 1316 | if (copy_from_user(&vif, optval, sizeof(vif))) |
132adf54 SH |
1317 | return -EFAULT; |
1318 | if (vif.vifc_vifi >= MAXVIFS) | |
1319 | return -ENFILE; | |
1320 | rtnl_lock(); | |
c354e124 | 1321 | if (optname == MRT_ADD_VIF) { |
4c968709 ED |
1322 | ret = vif_add(net, mrt, &vif, |
1323 | sk == rtnl_dereference(mrt->mroute_sk)); | |
132adf54 | 1324 | } else { |
0c12295a | 1325 | ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); |
132adf54 SH |
1326 | } |
1327 | rtnl_unlock(); | |
1328 | return ret; | |
1da177e4 LT |
1329 | |
1330 | /* | |
1331 | * Manipulate the forwarding caches. These live | |
1332 | * in a sort of kernel/user symbiosis. | |
1333 | */ | |
132adf54 SH |
1334 | case MRT_ADD_MFC: |
1335 | case MRT_DEL_MFC: | |
660b26dc ND |
1336 | parent = -1; |
1337 | case MRT_ADD_MFC_PROXY: | |
1338 | case MRT_DEL_MFC_PROXY: | |
c354e124 | 1339 | if (optlen != sizeof(mfc)) |
132adf54 | 1340 | return -EINVAL; |
c354e124 | 1341 | if (copy_from_user(&mfc, optval, sizeof(mfc))) |
132adf54 | 1342 | return -EFAULT; |
660b26dc ND |
1343 | if (parent == 0) |
1344 | parent = mfc.mfcc_parent; | |
132adf54 | 1345 | rtnl_lock(); |
660b26dc ND |
1346 | if (optname == MRT_DEL_MFC || optname == MRT_DEL_MFC_PROXY) |
1347 | ret = ipmr_mfc_delete(mrt, &mfc, parent); | |
132adf54 | 1348 | else |
4c968709 | 1349 | ret = ipmr_mfc_add(net, mrt, &mfc, |
660b26dc ND |
1350 | sk == rtnl_dereference(mrt->mroute_sk), |
1351 | parent); | |
132adf54 SH |
1352 | rtnl_unlock(); |
1353 | return ret; | |
1da177e4 LT |
1354 | /* |
1355 | * Control PIM assert. | |
1356 | */ | |
132adf54 SH |
1357 | case MRT_ASSERT: |
1358 | { | |
1359 | int v; | |
5e1859fb ED |
1360 | if (optlen != sizeof(v)) |
1361 | return -EINVAL; | |
a8cb16dd | 1362 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1363 | return -EFAULT; |
53d6841d | 1364 | mrt->mroute_do_assert = v; |
132adf54 SH |
1365 | return 0; |
1366 | } | |
1da177e4 | 1367 | #ifdef CONFIG_IP_PIMSM |
132adf54 SH |
1368 | case MRT_PIM: |
1369 | { | |
ba93ef74 SH |
1370 | int v; |
1371 | ||
5e1859fb ED |
1372 | if (optlen != sizeof(v)) |
1373 | return -EINVAL; | |
a8cb16dd | 1374 | if (get_user(v, (int __user *)optval)) |
132adf54 | 1375 | return -EFAULT; |
5e1859fb | 1376 | v = !!v; |
ba93ef74 | 1377 | |
132adf54 SH |
1378 | rtnl_lock(); |
1379 | ret = 0; | |
0c12295a PM |
1380 | if (v != mrt->mroute_do_pim) { |
1381 | mrt->mroute_do_pim = v; | |
1382 | mrt->mroute_do_assert = v; | |
1da177e4 | 1383 | } |
132adf54 SH |
1384 | rtnl_unlock(); |
1385 | return ret; | |
1386 | } | |
f0ad0860 PM |
1387 | #endif |
1388 | #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES | |
1389 | case MRT_TABLE: | |
1390 | { | |
1391 | u32 v; | |
1392 | ||
1393 | if (optlen != sizeof(u32)) | |
1394 | return -EINVAL; | |
1395 | if (get_user(v, (u32 __user *)optval)) | |
1396 | return -EFAULT; | |
f0ad0860 | 1397 | |
b49d3c1e ED |
1398 | /* "pimreg%u" should not exceed 16 bytes (IFNAMSIZ) */ |
1399 | if (v != RT_TABLE_DEFAULT && v >= 1000000000) | |
1400 | return -EINVAL; | |
1401 | ||
f0ad0860 PM |
1402 | rtnl_lock(); |
1403 | ret = 0; | |
4c968709 ED |
1404 | if (sk == rtnl_dereference(mrt->mroute_sk)) { |
1405 | ret = -EBUSY; | |
1406 | } else { | |
1407 | if (!ipmr_new_table(net, v)) | |
1408 | ret = -ENOMEM; | |
5e1859fb ED |
1409 | else |
1410 | raw_sk(sk)->ipmr_table = v; | |
4c968709 | 1411 | } |
f0ad0860 PM |
1412 | rtnl_unlock(); |
1413 | return ret; | |
1414 | } | |
1da177e4 | 1415 | #endif |
132adf54 SH |
1416 | /* |
1417 | * Spurious command, or MRT_VERSION which you cannot | |
1418 | * set. | |
1419 | */ | |
1420 | default: | |
1421 | return -ENOPROTOOPT; | |
1da177e4 LT |
1422 | } |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * Getsock opt support for the multicast routing system. | |
1427 | */ | |
e905a9ed | 1428 | |
c354e124 | 1429 | int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) |
1da177e4 LT |
1430 | { |
1431 | int olr; | |
1432 | int val; | |
4feb88e5 | 1433 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1434 | struct mr_table *mrt; |
1435 | ||
5e1859fb ED |
1436 | if (sk->sk_type != SOCK_RAW || |
1437 | inet_sk(sk)->inet_num != IPPROTO_IGMP) | |
1438 | return -EOPNOTSUPP; | |
1439 | ||
f0ad0860 PM |
1440 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); |
1441 | if (mrt == NULL) | |
1442 | return -ENOENT; | |
1da177e4 | 1443 | |
c354e124 | 1444 | if (optname != MRT_VERSION && |
1da177e4 | 1445 | #ifdef CONFIG_IP_PIMSM |
a8cb16dd | 1446 | optname != MRT_PIM && |
1da177e4 | 1447 | #endif |
a8cb16dd | 1448 | optname != MRT_ASSERT) |
1da177e4 LT |
1449 | return -ENOPROTOOPT; |
1450 | ||
1451 | if (get_user(olr, optlen)) | |
1452 | return -EFAULT; | |
1453 | ||
1454 | olr = min_t(unsigned int, olr, sizeof(int)); | |
1455 | if (olr < 0) | |
1456 | return -EINVAL; | |
e905a9ed | 1457 | |
c354e124 | 1458 | if (put_user(olr, optlen)) |
1da177e4 | 1459 | return -EFAULT; |
c354e124 JK |
1460 | if (optname == MRT_VERSION) |
1461 | val = 0x0305; | |
1da177e4 | 1462 | #ifdef CONFIG_IP_PIMSM |
c354e124 | 1463 | else if (optname == MRT_PIM) |
0c12295a | 1464 | val = mrt->mroute_do_pim; |
1da177e4 LT |
1465 | #endif |
1466 | else | |
0c12295a | 1467 | val = mrt->mroute_do_assert; |
c354e124 | 1468 | if (copy_to_user(optval, &val, olr)) |
1da177e4 LT |
1469 | return -EFAULT; |
1470 | return 0; | |
1471 | } | |
1472 | ||
1473 | /* | |
1474 | * The IP multicast ioctl support routines. | |
1475 | */ | |
e905a9ed | 1476 | |
1da177e4 LT |
1477 | int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) |
1478 | { | |
1479 | struct sioc_sg_req sr; | |
1480 | struct sioc_vif_req vr; | |
1481 | struct vif_device *vif; | |
1482 | struct mfc_cache *c; | |
4feb88e5 | 1483 | struct net *net = sock_net(sk); |
f0ad0860 PM |
1484 | struct mr_table *mrt; |
1485 | ||
1486 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1487 | if (mrt == NULL) | |
1488 | return -ENOENT; | |
e905a9ed | 1489 | |
132adf54 SH |
1490 | switch (cmd) { |
1491 | case SIOCGETVIFCNT: | |
c354e124 | 1492 | if (copy_from_user(&vr, arg, sizeof(vr))) |
132adf54 | 1493 | return -EFAULT; |
0c12295a | 1494 | if (vr.vifi >= mrt->maxvif) |
132adf54 SH |
1495 | return -EINVAL; |
1496 | read_lock(&mrt_lock); | |
0c12295a PM |
1497 | vif = &mrt->vif_table[vr.vifi]; |
1498 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
c354e124 JK |
1499 | vr.icount = vif->pkt_in; |
1500 | vr.ocount = vif->pkt_out; | |
1501 | vr.ibytes = vif->bytes_in; | |
1502 | vr.obytes = vif->bytes_out; | |
1da177e4 | 1503 | read_unlock(&mrt_lock); |
1da177e4 | 1504 | |
c354e124 | 1505 | if (copy_to_user(arg, &vr, sizeof(vr))) |
132adf54 SH |
1506 | return -EFAULT; |
1507 | return 0; | |
1508 | } | |
1509 | read_unlock(&mrt_lock); | |
1510 | return -EADDRNOTAVAIL; | |
1511 | case SIOCGETSGCNT: | |
c354e124 | 1512 | if (copy_from_user(&sr, arg, sizeof(sr))) |
132adf54 SH |
1513 | return -EFAULT; |
1514 | ||
a8c9486b | 1515 | rcu_read_lock(); |
0c12295a | 1516 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); |
132adf54 SH |
1517 | if (c) { |
1518 | sr.pktcnt = c->mfc_un.res.pkt; | |
1519 | sr.bytecnt = c->mfc_un.res.bytes; | |
1520 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
a8c9486b | 1521 | rcu_read_unlock(); |
132adf54 | 1522 | |
c354e124 | 1523 | if (copy_to_user(arg, &sr, sizeof(sr))) |
132adf54 SH |
1524 | return -EFAULT; |
1525 | return 0; | |
1526 | } | |
a8c9486b | 1527 | rcu_read_unlock(); |
132adf54 SH |
1528 | return -EADDRNOTAVAIL; |
1529 | default: | |
1530 | return -ENOIOCTLCMD; | |
1da177e4 LT |
1531 | } |
1532 | } | |
1533 | ||
709b46e8 EB |
1534 | #ifdef CONFIG_COMPAT |
1535 | struct compat_sioc_sg_req { | |
1536 | struct in_addr src; | |
1537 | struct in_addr grp; | |
1538 | compat_ulong_t pktcnt; | |
1539 | compat_ulong_t bytecnt; | |
1540 | compat_ulong_t wrong_if; | |
1541 | }; | |
1542 | ||
ca6b8bb0 DM |
1543 | struct compat_sioc_vif_req { |
1544 | vifi_t vifi; /* Which iface */ | |
1545 | compat_ulong_t icount; | |
1546 | compat_ulong_t ocount; | |
1547 | compat_ulong_t ibytes; | |
1548 | compat_ulong_t obytes; | |
1549 | }; | |
1550 | ||
709b46e8 EB |
1551 | int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) |
1552 | { | |
0033d5ad | 1553 | struct compat_sioc_sg_req sr; |
ca6b8bb0 DM |
1554 | struct compat_sioc_vif_req vr; |
1555 | struct vif_device *vif; | |
709b46e8 EB |
1556 | struct mfc_cache *c; |
1557 | struct net *net = sock_net(sk); | |
1558 | struct mr_table *mrt; | |
1559 | ||
1560 | mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); | |
1561 | if (mrt == NULL) | |
1562 | return -ENOENT; | |
1563 | ||
1564 | switch (cmd) { | |
ca6b8bb0 DM |
1565 | case SIOCGETVIFCNT: |
1566 | if (copy_from_user(&vr, arg, sizeof(vr))) | |
1567 | return -EFAULT; | |
1568 | if (vr.vifi >= mrt->maxvif) | |
1569 | return -EINVAL; | |
1570 | read_lock(&mrt_lock); | |
1571 | vif = &mrt->vif_table[vr.vifi]; | |
1572 | if (VIF_EXISTS(mrt, vr.vifi)) { | |
1573 | vr.icount = vif->pkt_in; | |
1574 | vr.ocount = vif->pkt_out; | |
1575 | vr.ibytes = vif->bytes_in; | |
1576 | vr.obytes = vif->bytes_out; | |
1577 | read_unlock(&mrt_lock); | |
1578 | ||
1579 | if (copy_to_user(arg, &vr, sizeof(vr))) | |
1580 | return -EFAULT; | |
1581 | return 0; | |
1582 | } | |
1583 | read_unlock(&mrt_lock); | |
1584 | return -EADDRNOTAVAIL; | |
709b46e8 EB |
1585 | case SIOCGETSGCNT: |
1586 | if (copy_from_user(&sr, arg, sizeof(sr))) | |
1587 | return -EFAULT; | |
1588 | ||
1589 | rcu_read_lock(); | |
1590 | c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); | |
1591 | if (c) { | |
1592 | sr.pktcnt = c->mfc_un.res.pkt; | |
1593 | sr.bytecnt = c->mfc_un.res.bytes; | |
1594 | sr.wrong_if = c->mfc_un.res.wrong_if; | |
1595 | rcu_read_unlock(); | |
1596 | ||
1597 | if (copy_to_user(arg, &sr, sizeof(sr))) | |
1598 | return -EFAULT; | |
1599 | return 0; | |
1600 | } | |
1601 | rcu_read_unlock(); | |
1602 | return -EADDRNOTAVAIL; | |
1603 | default: | |
1604 | return -ENOIOCTLCMD; | |
1605 | } | |
1606 | } | |
1607 | #endif | |
1608 | ||
1da177e4 LT |
1609 | |
1610 | static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1611 | { | |
351638e7 | 1612 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4feb88e5 | 1613 | struct net *net = dev_net(dev); |
f0ad0860 | 1614 | struct mr_table *mrt; |
1da177e4 LT |
1615 | struct vif_device *v; |
1616 | int ct; | |
e9dc8653 | 1617 | |
1da177e4 LT |
1618 | if (event != NETDEV_UNREGISTER) |
1619 | return NOTIFY_DONE; | |
f0ad0860 PM |
1620 | |
1621 | ipmr_for_each_table(mrt, net) { | |
1622 | v = &mrt->vif_table[0]; | |
1623 | for (ct = 0; ct < mrt->maxvif; ct++, v++) { | |
1624 | if (v->dev == dev) | |
e92036a6 | 1625 | vif_delete(mrt, ct, 1, NULL); |
f0ad0860 | 1626 | } |
1da177e4 LT |
1627 | } |
1628 | return NOTIFY_DONE; | |
1629 | } | |
1630 | ||
1631 | ||
c354e124 | 1632 | static struct notifier_block ip_mr_notifier = { |
1da177e4 LT |
1633 | .notifier_call = ipmr_device_event, |
1634 | }; | |
1635 | ||
1636 | /* | |
a8cb16dd | 1637 | * Encapsulate a packet by attaching a valid IPIP header to it. |
1da177e4 LT |
1638 | * This avoids tunnel drivers and other mess and gives us the speed so |
1639 | * important for multicast video. | |
1640 | */ | |
e905a9ed | 1641 | |
114c7844 | 1642 | static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 1643 | { |
8856dfa3 | 1644 | struct iphdr *iph; |
b71d1d42 | 1645 | const struct iphdr *old_iph = ip_hdr(skb); |
8856dfa3 ACM |
1646 | |
1647 | skb_push(skb, sizeof(struct iphdr)); | |
b0e380b1 | 1648 | skb->transport_header = skb->network_header; |
8856dfa3 | 1649 | skb_reset_network_header(skb); |
eddc9ec5 | 1650 | iph = ip_hdr(skb); |
1da177e4 | 1651 | |
a8cb16dd | 1652 | iph->version = 4; |
e023dd64 ACM |
1653 | iph->tos = old_iph->tos; |
1654 | iph->ttl = old_iph->ttl; | |
1da177e4 LT |
1655 | iph->frag_off = 0; |
1656 | iph->daddr = daddr; | |
1657 | iph->saddr = saddr; | |
1658 | iph->protocol = IPPROTO_IPIP; | |
1659 | iph->ihl = 5; | |
1660 | iph->tot_len = htons(skb->len); | |
703133de | 1661 | ip_select_ident(skb, skb_dst(skb), NULL); |
1da177e4 LT |
1662 | ip_send_check(iph); |
1663 | ||
1da177e4 LT |
1664 | memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
1665 | nf_reset(skb); | |
1666 | } | |
1667 | ||
1668 | static inline int ipmr_forward_finish(struct sk_buff *skb) | |
1669 | { | |
a8cb16dd | 1670 | struct ip_options *opt = &(IPCB(skb)->opt); |
1da177e4 | 1671 | |
adf30907 | 1672 | IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); |
2d8dbb04 | 1673 | IP_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTOCTETS, skb->len); |
1da177e4 LT |
1674 | |
1675 | if (unlikely(opt->optlen)) | |
1676 | ip_forward_options(skb); | |
1677 | ||
1678 | return dst_output(skb); | |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * Processing handlers for ipmr_forward | |
1683 | */ | |
1684 | ||
0c12295a PM |
1685 | static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, |
1686 | struct sk_buff *skb, struct mfc_cache *c, int vifi) | |
1da177e4 | 1687 | { |
eddc9ec5 | 1688 | const struct iphdr *iph = ip_hdr(skb); |
0c12295a | 1689 | struct vif_device *vif = &mrt->vif_table[vifi]; |
1da177e4 LT |
1690 | struct net_device *dev; |
1691 | struct rtable *rt; | |
31e4543d | 1692 | struct flowi4 fl4; |
1da177e4 LT |
1693 | int encap = 0; |
1694 | ||
1695 | if (vif->dev == NULL) | |
1696 | goto out_free; | |
1697 | ||
1698 | #ifdef CONFIG_IP_PIMSM | |
1699 | if (vif->flags & VIFF_REGISTER) { | |
1700 | vif->pkt_out++; | |
c354e124 | 1701 | vif->bytes_out += skb->len; |
cf3677ae PE |
1702 | vif->dev->stats.tx_bytes += skb->len; |
1703 | vif->dev->stats.tx_packets++; | |
0c12295a | 1704 | ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); |
69ebbf58 | 1705 | goto out_free; |
1da177e4 LT |
1706 | } |
1707 | #endif | |
1708 | ||
a8cb16dd | 1709 | if (vif->flags & VIFF_TUNNEL) { |
31e4543d | 1710 | rt = ip_route_output_ports(net, &fl4, NULL, |
78fbfd8a DM |
1711 | vif->remote, vif->local, |
1712 | 0, 0, | |
1713 | IPPROTO_IPIP, | |
1714 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1715 | if (IS_ERR(rt)) |
1da177e4 LT |
1716 | goto out_free; |
1717 | encap = sizeof(struct iphdr); | |
1718 | } else { | |
31e4543d | 1719 | rt = ip_route_output_ports(net, &fl4, NULL, iph->daddr, 0, |
78fbfd8a DM |
1720 | 0, 0, |
1721 | IPPROTO_IPIP, | |
1722 | RT_TOS(iph->tos), vif->link); | |
b23dd4fe | 1723 | if (IS_ERR(rt)) |
1da177e4 LT |
1724 | goto out_free; |
1725 | } | |
1726 | ||
d8d1f30b | 1727 | dev = rt->dst.dev; |
1da177e4 | 1728 | |
d8d1f30b | 1729 | if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { |
1da177e4 | 1730 | /* Do not fragment multicasts. Alas, IPv4 does not |
a8cb16dd ED |
1731 | * allow to send ICMP, so that packets will disappear |
1732 | * to blackhole. | |
1da177e4 LT |
1733 | */ |
1734 | ||
7c73a6fa | 1735 | IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); |
1da177e4 LT |
1736 | ip_rt_put(rt); |
1737 | goto out_free; | |
1738 | } | |
1739 | ||
d8d1f30b | 1740 | encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; |
1da177e4 LT |
1741 | |
1742 | if (skb_cow(skb, encap)) { | |
e905a9ed | 1743 | ip_rt_put(rt); |
1da177e4 LT |
1744 | goto out_free; |
1745 | } | |
1746 | ||
1747 | vif->pkt_out++; | |
c354e124 | 1748 | vif->bytes_out += skb->len; |
1da177e4 | 1749 | |
adf30907 | 1750 | skb_dst_drop(skb); |
d8d1f30b | 1751 | skb_dst_set(skb, &rt->dst); |
eddc9ec5 | 1752 | ip_decrease_ttl(ip_hdr(skb)); |
1da177e4 LT |
1753 | |
1754 | /* FIXME: forward and output firewalls used to be called here. | |
a8cb16dd ED |
1755 | * What do we do with netfilter? -- RR |
1756 | */ | |
1da177e4 LT |
1757 | if (vif->flags & VIFF_TUNNEL) { |
1758 | ip_encap(skb, vif->local, vif->remote); | |
1759 | /* FIXME: extra output firewall step used to be here. --RR */ | |
2f4c02d4 PE |
1760 | vif->dev->stats.tx_packets++; |
1761 | vif->dev->stats.tx_bytes += skb->len; | |
1da177e4 LT |
1762 | } |
1763 | ||
1764 | IPCB(skb)->flags |= IPSKB_FORWARDED; | |
1765 | ||
1766 | /* | |
1767 | * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally | |
1768 | * not only before forwarding, but after forwarding on all output | |
1769 | * interfaces. It is clear, if mrouter runs a multicasting | |
1770 | * program, it should receive packets not depending to what interface | |
1771 | * program is joined. | |
1772 | * If we will not make it, the program will have to join on all | |
1773 | * interfaces. On the other hand, multihoming host (or router, but | |
1774 | * not mrouter) cannot join to more than one interface - it will | |
1775 | * result in receiving multiple packets. | |
1776 | */ | |
9bbc768a | 1777 | NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, |
1da177e4 LT |
1778 | ipmr_forward_finish); |
1779 | return; | |
1780 | ||
1781 | out_free: | |
1782 | kfree_skb(skb); | |
1da177e4 LT |
1783 | } |
1784 | ||
0c12295a | 1785 | static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) |
1da177e4 LT |
1786 | { |
1787 | int ct; | |
0c12295a PM |
1788 | |
1789 | for (ct = mrt->maxvif-1; ct >= 0; ct--) { | |
1790 | if (mrt->vif_table[ct].dev == dev) | |
1da177e4 LT |
1791 | break; |
1792 | } | |
1793 | return ct; | |
1794 | } | |
1795 | ||
1796 | /* "local" means that we should preserve one skb (for local delivery) */ | |
1797 | ||
c4854ec8 RR |
1798 | static void ip_mr_forward(struct net *net, struct mr_table *mrt, |
1799 | struct sk_buff *skb, struct mfc_cache *cache, | |
1800 | int local) | |
1da177e4 LT |
1801 | { |
1802 | int psend = -1; | |
1803 | int vif, ct; | |
660b26dc | 1804 | int true_vifi = ipmr_find_vif(mrt, skb->dev); |
1da177e4 LT |
1805 | |
1806 | vif = cache->mfc_parent; | |
1807 | cache->mfc_un.res.pkt++; | |
1808 | cache->mfc_un.res.bytes += skb->len; | |
1809 | ||
360eb5da | 1810 | if (cache->mfc_origin == htonl(INADDR_ANY) && true_vifi >= 0) { |
660b26dc ND |
1811 | struct mfc_cache *cache_proxy; |
1812 | ||
1813 | /* For an (*,G) entry, we only check that the incomming | |
1814 | * interface is part of the static tree. | |
1815 | */ | |
1816 | cache_proxy = ipmr_cache_find_any_parent(mrt, vif); | |
1817 | if (cache_proxy && | |
1818 | cache_proxy->mfc_un.res.ttls[true_vifi] < 255) | |
1819 | goto forward; | |
1820 | } | |
1821 | ||
1da177e4 LT |
1822 | /* |
1823 | * Wrong interface: drop packet and (maybe) send PIM assert. | |
1824 | */ | |
0c12295a | 1825 | if (mrt->vif_table[vif].dev != skb->dev) { |
c7537967 | 1826 | if (rt_is_output_route(skb_rtable(skb))) { |
1da177e4 | 1827 | /* It is our own packet, looped back. |
a8cb16dd ED |
1828 | * Very complicated situation... |
1829 | * | |
1830 | * The best workaround until routing daemons will be | |
1831 | * fixed is not to redistribute packet, if it was | |
1832 | * send through wrong interface. It means, that | |
1833 | * multicast applications WILL NOT work for | |
1834 | * (S,G), which have default multicast route pointing | |
1835 | * to wrong oif. In any case, it is not a good | |
1836 | * idea to use multicasting applications on router. | |
1da177e4 LT |
1837 | */ |
1838 | goto dont_forward; | |
1839 | } | |
1840 | ||
1841 | cache->mfc_un.res.wrong_if++; | |
1da177e4 | 1842 | |
0c12295a | 1843 | if (true_vifi >= 0 && mrt->mroute_do_assert && |
1da177e4 | 1844 | /* pimsm uses asserts, when switching from RPT to SPT, |
a8cb16dd ED |
1845 | * so that we cannot check that packet arrived on an oif. |
1846 | * It is bad, but otherwise we would need to move pretty | |
1847 | * large chunk of pimd to kernel. Ough... --ANK | |
1da177e4 | 1848 | */ |
0c12295a | 1849 | (mrt->mroute_do_pim || |
6f9374a9 | 1850 | cache->mfc_un.res.ttls[true_vifi] < 255) && |
e905a9ed | 1851 | time_after(jiffies, |
1da177e4 LT |
1852 | cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { |
1853 | cache->mfc_un.res.last_assert = jiffies; | |
0c12295a | 1854 | ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); |
1da177e4 LT |
1855 | } |
1856 | goto dont_forward; | |
1857 | } | |
1858 | ||
660b26dc | 1859 | forward: |
0c12295a PM |
1860 | mrt->vif_table[vif].pkt_in++; |
1861 | mrt->vif_table[vif].bytes_in += skb->len; | |
1da177e4 LT |
1862 | |
1863 | /* | |
1864 | * Forward the frame | |
1865 | */ | |
360eb5da ND |
1866 | if (cache->mfc_origin == htonl(INADDR_ANY) && |
1867 | cache->mfc_mcastgrp == htonl(INADDR_ANY)) { | |
660b26dc ND |
1868 | if (true_vifi >= 0 && |
1869 | true_vifi != cache->mfc_parent && | |
1870 | ip_hdr(skb)->ttl > | |
1871 | cache->mfc_un.res.ttls[cache->mfc_parent]) { | |
1872 | /* It's an (*,*) entry and the packet is not coming from | |
1873 | * the upstream: forward the packet to the upstream | |
1874 | * only. | |
1875 | */ | |
1876 | psend = cache->mfc_parent; | |
1877 | goto last_forward; | |
1878 | } | |
1879 | goto dont_forward; | |
1880 | } | |
a8cb16dd ED |
1881 | for (ct = cache->mfc_un.res.maxvif - 1; |
1882 | ct >= cache->mfc_un.res.minvif; ct--) { | |
660b26dc | 1883 | /* For (*,G) entry, don't forward to the incoming interface */ |
360eb5da ND |
1884 | if ((cache->mfc_origin != htonl(INADDR_ANY) || |
1885 | ct != true_vifi) && | |
660b26dc | 1886 | ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { |
1da177e4 LT |
1887 | if (psend != -1) { |
1888 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1889 | |
1da177e4 | 1890 | if (skb2) |
0c12295a PM |
1891 | ipmr_queue_xmit(net, mrt, skb2, cache, |
1892 | psend); | |
1da177e4 | 1893 | } |
c354e124 | 1894 | psend = ct; |
1da177e4 LT |
1895 | } |
1896 | } | |
660b26dc | 1897 | last_forward: |
1da177e4 LT |
1898 | if (psend != -1) { |
1899 | if (local) { | |
1900 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
a8cb16dd | 1901 | |
1da177e4 | 1902 | if (skb2) |
0c12295a | 1903 | ipmr_queue_xmit(net, mrt, skb2, cache, psend); |
1da177e4 | 1904 | } else { |
0c12295a | 1905 | ipmr_queue_xmit(net, mrt, skb, cache, psend); |
c4854ec8 | 1906 | return; |
1da177e4 LT |
1907 | } |
1908 | } | |
1909 | ||
1910 | dont_forward: | |
1911 | if (!local) | |
1912 | kfree_skb(skb); | |
1da177e4 LT |
1913 | } |
1914 | ||
417da66f | 1915 | static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct sk_buff *skb) |
ee3f1aaf | 1916 | { |
417da66f DM |
1917 | struct rtable *rt = skb_rtable(skb); |
1918 | struct iphdr *iph = ip_hdr(skb); | |
da91981b | 1919 | struct flowi4 fl4 = { |
417da66f DM |
1920 | .daddr = iph->daddr, |
1921 | .saddr = iph->saddr, | |
b0fe4a31 | 1922 | .flowi4_tos = RT_TOS(iph->tos), |
4fd551d7 DM |
1923 | .flowi4_oif = (rt_is_output_route(rt) ? |
1924 | skb->dev->ifindex : 0), | |
1925 | .flowi4_iif = (rt_is_output_route(rt) ? | |
1fb9489b | 1926 | LOOPBACK_IFINDEX : |
4fd551d7 | 1927 | skb->dev->ifindex), |
b4869889 | 1928 | .flowi4_mark = skb->mark, |
ee3f1aaf DM |
1929 | }; |
1930 | struct mr_table *mrt; | |
1931 | int err; | |
1932 | ||
da91981b | 1933 | err = ipmr_fib_lookup(net, &fl4, &mrt); |
ee3f1aaf DM |
1934 | if (err) |
1935 | return ERR_PTR(err); | |
1936 | return mrt; | |
1937 | } | |
1da177e4 LT |
1938 | |
1939 | /* | |
1940 | * Multicast packets for forwarding arrive here | |
4c968709 | 1941 | * Called with rcu_read_lock(); |
1da177e4 LT |
1942 | */ |
1943 | ||
1944 | int ip_mr_input(struct sk_buff *skb) | |
1945 | { | |
1946 | struct mfc_cache *cache; | |
4feb88e5 | 1947 | struct net *net = dev_net(skb->dev); |
511c3f92 | 1948 | int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; |
f0ad0860 | 1949 | struct mr_table *mrt; |
1da177e4 LT |
1950 | |
1951 | /* Packet is looped back after forward, it should not be | |
a8cb16dd | 1952 | * forwarded second time, but still can be delivered locally. |
1da177e4 | 1953 | */ |
4c968709 | 1954 | if (IPCB(skb)->flags & IPSKB_FORWARDED) |
1da177e4 LT |
1955 | goto dont_forward; |
1956 | ||
417da66f | 1957 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
1958 | if (IS_ERR(mrt)) { |
1959 | kfree_skb(skb); | |
1960 | return PTR_ERR(mrt); | |
e40dbc51 | 1961 | } |
1da177e4 | 1962 | if (!local) { |
4c968709 ED |
1963 | if (IPCB(skb)->opt.router_alert) { |
1964 | if (ip_call_ra_chain(skb)) | |
1965 | return 0; | |
1966 | } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { | |
1967 | /* IGMPv1 (and broken IGMPv2 implementations sort of | |
1968 | * Cisco IOS <= 11.2(8)) do not put router alert | |
1969 | * option to IGMP packets destined to routable | |
1970 | * groups. It is very bad, because it means | |
1971 | * that we can forward NO IGMP messages. | |
1972 | */ | |
1973 | struct sock *mroute_sk; | |
1974 | ||
1975 | mroute_sk = rcu_dereference(mrt->mroute_sk); | |
1976 | if (mroute_sk) { | |
1977 | nf_reset(skb); | |
1978 | raw_rcv(mroute_sk, skb); | |
1979 | return 0; | |
1980 | } | |
1da177e4 LT |
1981 | } |
1982 | } | |
1983 | ||
a8c9486b | 1984 | /* already under rcu_read_lock() */ |
0c12295a | 1985 | cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
660b26dc ND |
1986 | if (cache == NULL) { |
1987 | int vif = ipmr_find_vif(mrt, skb->dev); | |
1988 | ||
1989 | if (vif >= 0) | |
1990 | cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr, | |
1991 | vif); | |
1992 | } | |
1da177e4 LT |
1993 | |
1994 | /* | |
1995 | * No usable cache entry | |
1996 | */ | |
c354e124 | 1997 | if (cache == NULL) { |
1da177e4 LT |
1998 | int vif; |
1999 | ||
2000 | if (local) { | |
2001 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
2002 | ip_local_deliver(skb); | |
a8c9486b | 2003 | if (skb2 == NULL) |
1da177e4 | 2004 | return -ENOBUFS; |
1da177e4 LT |
2005 | skb = skb2; |
2006 | } | |
2007 | ||
a8c9486b | 2008 | read_lock(&mrt_lock); |
0c12295a | 2009 | vif = ipmr_find_vif(mrt, skb->dev); |
1da177e4 | 2010 | if (vif >= 0) { |
0eae88f3 | 2011 | int err2 = ipmr_cache_unresolved(mrt, vif, skb); |
1da177e4 LT |
2012 | read_unlock(&mrt_lock); |
2013 | ||
0eae88f3 | 2014 | return err2; |
1da177e4 LT |
2015 | } |
2016 | read_unlock(&mrt_lock); | |
2017 | kfree_skb(skb); | |
2018 | return -ENODEV; | |
2019 | } | |
2020 | ||
a8c9486b | 2021 | read_lock(&mrt_lock); |
0c12295a | 2022 | ip_mr_forward(net, mrt, skb, cache, local); |
1da177e4 LT |
2023 | read_unlock(&mrt_lock); |
2024 | ||
2025 | if (local) | |
2026 | return ip_local_deliver(skb); | |
2027 | ||
2028 | return 0; | |
2029 | ||
2030 | dont_forward: | |
2031 | if (local) | |
2032 | return ip_local_deliver(skb); | |
2033 | kfree_skb(skb); | |
2034 | return 0; | |
2035 | } | |
2036 | ||
b1879204 | 2037 | #ifdef CONFIG_IP_PIMSM |
55747a0a | 2038 | /* called with rcu_read_lock() */ |
f0ad0860 PM |
2039 | static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, |
2040 | unsigned int pimlen) | |
1da177e4 | 2041 | { |
b1879204 IJ |
2042 | struct net_device *reg_dev = NULL; |
2043 | struct iphdr *encap; | |
1da177e4 | 2044 | |
b1879204 | 2045 | encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); |
1da177e4 | 2046 | /* |
a8cb16dd ED |
2047 | * Check that: |
2048 | * a. packet is really sent to a multicast group | |
2049 | * b. packet is not a NULL-REGISTER | |
2050 | * c. packet is not truncated | |
1da177e4 | 2051 | */ |
f97c1e0c | 2052 | if (!ipv4_is_multicast(encap->daddr) || |
1da177e4 | 2053 | encap->tot_len == 0 || |
b1879204 IJ |
2054 | ntohs(encap->tot_len) + pimlen > skb->len) |
2055 | return 1; | |
1da177e4 LT |
2056 | |
2057 | read_lock(&mrt_lock); | |
0c12295a PM |
2058 | if (mrt->mroute_reg_vif_num >= 0) |
2059 | reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; | |
1da177e4 LT |
2060 | read_unlock(&mrt_lock); |
2061 | ||
e905a9ed | 2062 | if (reg_dev == NULL) |
b1879204 | 2063 | return 1; |
1da177e4 | 2064 | |
b0e380b1 | 2065 | skb->mac_header = skb->network_header; |
55747a0a | 2066 | skb_pull(skb, (u8 *)encap - skb->data); |
31c7711b | 2067 | skb_reset_network_header(skb); |
1da177e4 | 2068 | skb->protocol = htons(ETH_P_IP); |
55747a0a | 2069 | skb->ip_summed = CHECKSUM_NONE; |
d19d56dd | 2070 | |
ea23192e | 2071 | skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); |
d19d56dd | 2072 | |
1da177e4 | 2073 | netif_rx(skb); |
b1879204 | 2074 | |
55747a0a | 2075 | return NET_RX_SUCCESS; |
b1879204 IJ |
2076 | } |
2077 | #endif | |
2078 | ||
2079 | #ifdef CONFIG_IP_PIMSM_V1 | |
2080 | /* | |
2081 | * Handle IGMP messages of PIMv1 | |
2082 | */ | |
2083 | ||
a8cb16dd | 2084 | int pim_rcv_v1(struct sk_buff *skb) |
b1879204 IJ |
2085 | { |
2086 | struct igmphdr *pim; | |
4feb88e5 | 2087 | struct net *net = dev_net(skb->dev); |
f0ad0860 | 2088 | struct mr_table *mrt; |
b1879204 IJ |
2089 | |
2090 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) | |
2091 | goto drop; | |
2092 | ||
2093 | pim = igmp_hdr(skb); | |
2094 | ||
417da66f | 2095 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2096 | if (IS_ERR(mrt)) |
2097 | goto drop; | |
0c12295a | 2098 | if (!mrt->mroute_do_pim || |
b1879204 IJ |
2099 | pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) |
2100 | goto drop; | |
2101 | ||
f0ad0860 | 2102 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2103 | drop: |
2104 | kfree_skb(skb); | |
2105 | } | |
1da177e4 LT |
2106 | return 0; |
2107 | } | |
2108 | #endif | |
2109 | ||
2110 | #ifdef CONFIG_IP_PIMSM_V2 | |
a8cb16dd | 2111 | static int pim_rcv(struct sk_buff *skb) |
1da177e4 LT |
2112 | { |
2113 | struct pimreghdr *pim; | |
f0ad0860 PM |
2114 | struct net *net = dev_net(skb->dev); |
2115 | struct mr_table *mrt; | |
1da177e4 | 2116 | |
b1879204 | 2117 | if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) |
1da177e4 LT |
2118 | goto drop; |
2119 | ||
9c70220b | 2120 | pim = (struct pimreghdr *)skb_transport_header(skb); |
a8cb16dd ED |
2121 | if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || |
2122 | (pim->flags & PIM_NULL_REGISTER) || | |
e905a9ed | 2123 | (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && |
d3bc23e7 | 2124 | csum_fold(skb_checksum(skb, 0, skb->len, 0)))) |
1da177e4 LT |
2125 | goto drop; |
2126 | ||
417da66f | 2127 | mrt = ipmr_rt_fib_lookup(net, skb); |
ee3f1aaf DM |
2128 | if (IS_ERR(mrt)) |
2129 | goto drop; | |
f0ad0860 | 2130 | if (__pim_rcv(mrt, skb, sizeof(*pim))) { |
b1879204 IJ |
2131 | drop: |
2132 | kfree_skb(skb); | |
2133 | } | |
1da177e4 LT |
2134 | return 0; |
2135 | } | |
2136 | #endif | |
2137 | ||
cb6a4e46 PM |
2138 | static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
2139 | struct mfc_cache *c, struct rtmsg *rtm) | |
1da177e4 LT |
2140 | { |
2141 | int ct; | |
2142 | struct rtnexthop *nhp; | |
92a395e5 | 2143 | struct nlattr *mp_attr; |
adfa85e4 | 2144 | struct rta_mfc_stats mfcs; |
1da177e4 | 2145 | |
7438189b | 2146 | /* If cache is unresolved, don't try to parse IIF and OIF */ |
ed0f160a | 2147 | if (c->mfc_parent >= MAXVIFS) |
7438189b ND |
2148 | return -ENOENT; |
2149 | ||
92a395e5 TG |
2150 | if (VIF_EXISTS(mrt, c->mfc_parent) && |
2151 | nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) | |
2152 | return -EMSGSIZE; | |
1da177e4 | 2153 | |
92a395e5 TG |
2154 | if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH))) |
2155 | return -EMSGSIZE; | |
1da177e4 LT |
2156 | |
2157 | for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { | |
0c12295a | 2158 | if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
92a395e5 TG |
2159 | if (!(nhp = nla_reserve_nohdr(skb, sizeof(*nhp)))) { |
2160 | nla_nest_cancel(skb, mp_attr); | |
2161 | return -EMSGSIZE; | |
2162 | } | |
2163 | ||
1da177e4 LT |
2164 | nhp->rtnh_flags = 0; |
2165 | nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; | |
0c12295a | 2166 | nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; |
1da177e4 LT |
2167 | nhp->rtnh_len = sizeof(*nhp); |
2168 | } | |
2169 | } | |
92a395e5 TG |
2170 | |
2171 | nla_nest_end(skb, mp_attr); | |
2172 | ||
adfa85e4 ND |
2173 | mfcs.mfcs_packets = c->mfc_un.res.pkt; |
2174 | mfcs.mfcs_bytes = c->mfc_un.res.bytes; | |
2175 | mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; | |
2176 | if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0) | |
2177 | return -EMSGSIZE; | |
2178 | ||
1da177e4 LT |
2179 | rtm->rtm_type = RTN_MULTICAST; |
2180 | return 1; | |
1da177e4 LT |
2181 | } |
2182 | ||
9a1b9496 DM |
2183 | int ipmr_get_route(struct net *net, struct sk_buff *skb, |
2184 | __be32 saddr, __be32 daddr, | |
2185 | struct rtmsg *rtm, int nowait) | |
1da177e4 | 2186 | { |
1da177e4 | 2187 | struct mfc_cache *cache; |
9a1b9496 DM |
2188 | struct mr_table *mrt; |
2189 | int err; | |
1da177e4 | 2190 | |
f0ad0860 PM |
2191 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
2192 | if (mrt == NULL) | |
2193 | return -ENOENT; | |
2194 | ||
a8c9486b | 2195 | rcu_read_lock(); |
9a1b9496 | 2196 | cache = ipmr_cache_find(mrt, saddr, daddr); |
660b26dc ND |
2197 | if (cache == NULL && skb->dev) { |
2198 | int vif = ipmr_find_vif(mrt, skb->dev); | |
1da177e4 | 2199 | |
660b26dc ND |
2200 | if (vif >= 0) |
2201 | cache = ipmr_cache_find_any(mrt, daddr, vif); | |
2202 | } | |
c354e124 | 2203 | if (cache == NULL) { |
72287490 | 2204 | struct sk_buff *skb2; |
eddc9ec5 | 2205 | struct iphdr *iph; |
1da177e4 | 2206 | struct net_device *dev; |
a8cb16dd | 2207 | int vif = -1; |
1da177e4 LT |
2208 | |
2209 | if (nowait) { | |
a8c9486b | 2210 | rcu_read_unlock(); |
1da177e4 LT |
2211 | return -EAGAIN; |
2212 | } | |
2213 | ||
2214 | dev = skb->dev; | |
a8c9486b | 2215 | read_lock(&mrt_lock); |
a8cb16dd ED |
2216 | if (dev) |
2217 | vif = ipmr_find_vif(mrt, dev); | |
2218 | if (vif < 0) { | |
1da177e4 | 2219 | read_unlock(&mrt_lock); |
a8c9486b | 2220 | rcu_read_unlock(); |
1da177e4 LT |
2221 | return -ENODEV; |
2222 | } | |
72287490 AK |
2223 | skb2 = skb_clone(skb, GFP_ATOMIC); |
2224 | if (!skb2) { | |
2225 | read_unlock(&mrt_lock); | |
a8c9486b | 2226 | rcu_read_unlock(); |
72287490 AK |
2227 | return -ENOMEM; |
2228 | } | |
2229 | ||
e2d1bca7 ACM |
2230 | skb_push(skb2, sizeof(struct iphdr)); |
2231 | skb_reset_network_header(skb2); | |
eddc9ec5 ACM |
2232 | iph = ip_hdr(skb2); |
2233 | iph->ihl = sizeof(struct iphdr) >> 2; | |
9a1b9496 DM |
2234 | iph->saddr = saddr; |
2235 | iph->daddr = daddr; | |
eddc9ec5 | 2236 | iph->version = 0; |
0c12295a | 2237 | err = ipmr_cache_unresolved(mrt, vif, skb2); |
1da177e4 | 2238 | read_unlock(&mrt_lock); |
a8c9486b | 2239 | rcu_read_unlock(); |
1da177e4 LT |
2240 | return err; |
2241 | } | |
2242 | ||
a8c9486b ED |
2243 | read_lock(&mrt_lock); |
2244 | if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) | |
1da177e4 | 2245 | cache->mfc_flags |= MFC_NOTIFY; |
cb6a4e46 | 2246 | err = __ipmr_fill_mroute(mrt, skb, cache, rtm); |
1da177e4 | 2247 | read_unlock(&mrt_lock); |
a8c9486b | 2248 | rcu_read_unlock(); |
1da177e4 LT |
2249 | return err; |
2250 | } | |
2251 | ||
cb6a4e46 | 2252 | static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
8cd3ac9f | 2253 | u32 portid, u32 seq, struct mfc_cache *c, int cmd) |
cb6a4e46 PM |
2254 | { |
2255 | struct nlmsghdr *nlh; | |
2256 | struct rtmsg *rtm; | |
1eb99af5 | 2257 | int err; |
cb6a4e46 | 2258 | |
8cd3ac9f | 2259 | nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), NLM_F_MULTI); |
cb6a4e46 PM |
2260 | if (nlh == NULL) |
2261 | return -EMSGSIZE; | |
2262 | ||
2263 | rtm = nlmsg_data(nlh); | |
2264 | rtm->rtm_family = RTNL_FAMILY_IPMR; | |
2265 | rtm->rtm_dst_len = 32; | |
2266 | rtm->rtm_src_len = 32; | |
2267 | rtm->rtm_tos = 0; | |
2268 | rtm->rtm_table = mrt->id; | |
f3756b79 DM |
2269 | if (nla_put_u32(skb, RTA_TABLE, mrt->id)) |
2270 | goto nla_put_failure; | |
cb6a4e46 PM |
2271 | rtm->rtm_type = RTN_MULTICAST; |
2272 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
9a68ac72 ND |
2273 | if (c->mfc_flags & MFC_STATIC) |
2274 | rtm->rtm_protocol = RTPROT_STATIC; | |
2275 | else | |
2276 | rtm->rtm_protocol = RTPROT_MROUTED; | |
cb6a4e46 PM |
2277 | rtm->rtm_flags = 0; |
2278 | ||
f3756b79 DM |
2279 | if (nla_put_be32(skb, RTA_SRC, c->mfc_origin) || |
2280 | nla_put_be32(skb, RTA_DST, c->mfc_mcastgrp)) | |
2281 | goto nla_put_failure; | |
1eb99af5 ND |
2282 | err = __ipmr_fill_mroute(mrt, skb, c, rtm); |
2283 | /* do not break the dump if cache is unresolved */ | |
2284 | if (err < 0 && err != -ENOENT) | |
cb6a4e46 PM |
2285 | goto nla_put_failure; |
2286 | ||
2287 | return nlmsg_end(skb, nlh); | |
2288 | ||
2289 | nla_put_failure: | |
2290 | nlmsg_cancel(skb, nlh); | |
2291 | return -EMSGSIZE; | |
2292 | } | |
2293 | ||
8cd3ac9f ND |
2294 | static size_t mroute_msgsize(bool unresolved, int maxvif) |
2295 | { | |
2296 | size_t len = | |
2297 | NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2298 | + nla_total_size(4) /* RTA_TABLE */ | |
2299 | + nla_total_size(4) /* RTA_SRC */ | |
2300 | + nla_total_size(4) /* RTA_DST */ | |
2301 | ; | |
2302 | ||
2303 | if (!unresolved) | |
2304 | len = len | |
2305 | + nla_total_size(4) /* RTA_IIF */ | |
2306 | + nla_total_size(0) /* RTA_MULTIPATH */ | |
2307 | + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) | |
2308 | /* RTA_MFC_STATS */ | |
2309 | + nla_total_size(sizeof(struct rta_mfc_stats)) | |
2310 | ; | |
2311 | ||
2312 | return len; | |
2313 | } | |
2314 | ||
2315 | static void mroute_netlink_event(struct mr_table *mrt, struct mfc_cache *mfc, | |
2316 | int cmd) | |
2317 | { | |
2318 | struct net *net = read_pnet(&mrt->net); | |
2319 | struct sk_buff *skb; | |
2320 | int err = -ENOBUFS; | |
2321 | ||
2322 | skb = nlmsg_new(mroute_msgsize(mfc->mfc_parent >= MAXVIFS, mrt->maxvif), | |
2323 | GFP_ATOMIC); | |
2324 | if (skb == NULL) | |
2325 | goto errout; | |
2326 | ||
2327 | err = ipmr_fill_mroute(mrt, skb, 0, 0, mfc, cmd); | |
2328 | if (err < 0) | |
2329 | goto errout; | |
2330 | ||
2331 | rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MROUTE, NULL, GFP_ATOMIC); | |
2332 | return; | |
2333 | ||
2334 | errout: | |
2335 | kfree_skb(skb); | |
2336 | if (err < 0) | |
2337 | rtnl_set_sk_err(net, RTNLGRP_IPV4_MROUTE, err); | |
2338 | } | |
2339 | ||
cb6a4e46 PM |
2340 | static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) |
2341 | { | |
2342 | struct net *net = sock_net(skb->sk); | |
2343 | struct mr_table *mrt; | |
2344 | struct mfc_cache *mfc; | |
2345 | unsigned int t = 0, s_t; | |
2346 | unsigned int h = 0, s_h; | |
2347 | unsigned int e = 0, s_e; | |
2348 | ||
2349 | s_t = cb->args[0]; | |
2350 | s_h = cb->args[1]; | |
2351 | s_e = cb->args[2]; | |
2352 | ||
a8c9486b | 2353 | rcu_read_lock(); |
cb6a4e46 PM |
2354 | ipmr_for_each_table(mrt, net) { |
2355 | if (t < s_t) | |
2356 | goto next_table; | |
2357 | if (t > s_t) | |
2358 | s_h = 0; | |
2359 | for (h = s_h; h < MFC_LINES; h++) { | |
a8c9486b | 2360 | list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { |
cb6a4e46 PM |
2361 | if (e < s_e) |
2362 | goto next_entry; | |
2363 | if (ipmr_fill_mroute(mrt, skb, | |
15e47304 | 2364 | NETLINK_CB(cb->skb).portid, |
cb6a4e46 | 2365 | cb->nlh->nlmsg_seq, |
8cd3ac9f | 2366 | mfc, RTM_NEWROUTE) < 0) |
cb6a4e46 PM |
2367 | goto done; |
2368 | next_entry: | |
2369 | e++; | |
2370 | } | |
2371 | e = s_e = 0; | |
2372 | } | |
1eb99af5 ND |
2373 | spin_lock_bh(&mfc_unres_lock); |
2374 | list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { | |
2375 | if (e < s_e) | |
2376 | goto next_entry2; | |
2377 | if (ipmr_fill_mroute(mrt, skb, | |
2378 | NETLINK_CB(cb->skb).portid, | |
2379 | cb->nlh->nlmsg_seq, | |
8cd3ac9f | 2380 | mfc, RTM_NEWROUTE) < 0) { |
1eb99af5 ND |
2381 | spin_unlock_bh(&mfc_unres_lock); |
2382 | goto done; | |
2383 | } | |
2384 | next_entry2: | |
2385 | e++; | |
2386 | } | |
2387 | spin_unlock_bh(&mfc_unres_lock); | |
2388 | e = s_e = 0; | |
cb6a4e46 PM |
2389 | s_h = 0; |
2390 | next_table: | |
2391 | t++; | |
2392 | } | |
2393 | done: | |
a8c9486b | 2394 | rcu_read_unlock(); |
cb6a4e46 PM |
2395 | |
2396 | cb->args[2] = e; | |
2397 | cb->args[1] = h; | |
2398 | cb->args[0] = t; | |
2399 | ||
2400 | return skb->len; | |
2401 | } | |
2402 | ||
e905a9ed | 2403 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2404 | /* |
a8cb16dd ED |
2405 | * The /proc interfaces to multicast routing : |
2406 | * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif | |
1da177e4 LT |
2407 | */ |
2408 | struct ipmr_vif_iter { | |
f6bb4514 | 2409 | struct seq_net_private p; |
f0ad0860 | 2410 | struct mr_table *mrt; |
1da177e4 LT |
2411 | int ct; |
2412 | }; | |
2413 | ||
f6bb4514 BT |
2414 | static struct vif_device *ipmr_vif_seq_idx(struct net *net, |
2415 | struct ipmr_vif_iter *iter, | |
1da177e4 LT |
2416 | loff_t pos) |
2417 | { | |
f0ad0860 | 2418 | struct mr_table *mrt = iter->mrt; |
0c12295a PM |
2419 | |
2420 | for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { | |
2421 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2422 | continue; |
e905a9ed | 2423 | if (pos-- == 0) |
0c12295a | 2424 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2425 | } |
2426 | return NULL; | |
2427 | } | |
2428 | ||
2429 | static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) | |
ba93ef74 | 2430 | __acquires(mrt_lock) |
1da177e4 | 2431 | { |
f0ad0860 | 2432 | struct ipmr_vif_iter *iter = seq->private; |
f6bb4514 | 2433 | struct net *net = seq_file_net(seq); |
f0ad0860 PM |
2434 | struct mr_table *mrt; |
2435 | ||
2436 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); | |
2437 | if (mrt == NULL) | |
2438 | return ERR_PTR(-ENOENT); | |
2439 | ||
2440 | iter->mrt = mrt; | |
f6bb4514 | 2441 | |
1da177e4 | 2442 | read_lock(&mrt_lock); |
f6bb4514 | 2443 | return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2444 | : SEQ_START_TOKEN; |
2445 | } | |
2446 | ||
2447 | static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2448 | { | |
2449 | struct ipmr_vif_iter *iter = seq->private; | |
f6bb4514 | 2450 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2451 | struct mr_table *mrt = iter->mrt; |
1da177e4 LT |
2452 | |
2453 | ++*pos; | |
2454 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2455 | return ipmr_vif_seq_idx(net, iter, 0); |
e905a9ed | 2456 | |
0c12295a PM |
2457 | while (++iter->ct < mrt->maxvif) { |
2458 | if (!VIF_EXISTS(mrt, iter->ct)) | |
1da177e4 | 2459 | continue; |
0c12295a | 2460 | return &mrt->vif_table[iter->ct]; |
1da177e4 LT |
2461 | } |
2462 | return NULL; | |
2463 | } | |
2464 | ||
2465 | static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) | |
ba93ef74 | 2466 | __releases(mrt_lock) |
1da177e4 LT |
2467 | { |
2468 | read_unlock(&mrt_lock); | |
2469 | } | |
2470 | ||
2471 | static int ipmr_vif_seq_show(struct seq_file *seq, void *v) | |
2472 | { | |
f0ad0860 PM |
2473 | struct ipmr_vif_iter *iter = seq->private; |
2474 | struct mr_table *mrt = iter->mrt; | |
f6bb4514 | 2475 | |
1da177e4 | 2476 | if (v == SEQ_START_TOKEN) { |
e905a9ed | 2477 | seq_puts(seq, |
1da177e4 LT |
2478 | "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); |
2479 | } else { | |
2480 | const struct vif_device *vif = v; | |
2481 | const char *name = vif->dev ? vif->dev->name : "none"; | |
2482 | ||
2483 | seq_printf(seq, | |
2484 | "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", | |
0c12295a | 2485 | vif - mrt->vif_table, |
e905a9ed | 2486 | name, vif->bytes_in, vif->pkt_in, |
1da177e4 LT |
2487 | vif->bytes_out, vif->pkt_out, |
2488 | vif->flags, vif->local, vif->remote); | |
2489 | } | |
2490 | return 0; | |
2491 | } | |
2492 | ||
f690808e | 2493 | static const struct seq_operations ipmr_vif_seq_ops = { |
1da177e4 LT |
2494 | .start = ipmr_vif_seq_start, |
2495 | .next = ipmr_vif_seq_next, | |
2496 | .stop = ipmr_vif_seq_stop, | |
2497 | .show = ipmr_vif_seq_show, | |
2498 | }; | |
2499 | ||
2500 | static int ipmr_vif_open(struct inode *inode, struct file *file) | |
2501 | { | |
f6bb4514 BT |
2502 | return seq_open_net(inode, file, &ipmr_vif_seq_ops, |
2503 | sizeof(struct ipmr_vif_iter)); | |
1da177e4 LT |
2504 | } |
2505 | ||
9a32144e | 2506 | static const struct file_operations ipmr_vif_fops = { |
1da177e4 LT |
2507 | .owner = THIS_MODULE, |
2508 | .open = ipmr_vif_open, | |
2509 | .read = seq_read, | |
2510 | .llseek = seq_lseek, | |
f6bb4514 | 2511 | .release = seq_release_net, |
1da177e4 LT |
2512 | }; |
2513 | ||
2514 | struct ipmr_mfc_iter { | |
f6bb4514 | 2515 | struct seq_net_private p; |
f0ad0860 | 2516 | struct mr_table *mrt; |
862465f2 | 2517 | struct list_head *cache; |
1da177e4 LT |
2518 | int ct; |
2519 | }; | |
2520 | ||
2521 | ||
f6bb4514 BT |
2522 | static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, |
2523 | struct ipmr_mfc_iter *it, loff_t pos) | |
1da177e4 | 2524 | { |
f0ad0860 | 2525 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2526 | struct mfc_cache *mfc; |
2527 | ||
a8c9486b | 2528 | rcu_read_lock(); |
862465f2 | 2529 | for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { |
0c12295a | 2530 | it->cache = &mrt->mfc_cache_array[it->ct]; |
a8c9486b | 2531 | list_for_each_entry_rcu(mfc, it->cache, list) |
e905a9ed | 2532 | if (pos-- == 0) |
1da177e4 | 2533 | return mfc; |
862465f2 | 2534 | } |
a8c9486b | 2535 | rcu_read_unlock(); |
1da177e4 | 2536 | |
1da177e4 | 2537 | spin_lock_bh(&mfc_unres_lock); |
0c12295a | 2538 | it->cache = &mrt->mfc_unres_queue; |
862465f2 | 2539 | list_for_each_entry(mfc, it->cache, list) |
e258beb2 | 2540 | if (pos-- == 0) |
1da177e4 LT |
2541 | return mfc; |
2542 | spin_unlock_bh(&mfc_unres_lock); | |
2543 | ||
2544 | it->cache = NULL; | |
2545 | return NULL; | |
2546 | } | |
2547 | ||
2548 | ||
2549 | static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) | |
2550 | { | |
2551 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2552 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2553 | struct mr_table *mrt; |
f6bb4514 | 2554 | |
f0ad0860 PM |
2555 | mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); |
2556 | if (mrt == NULL) | |
2557 | return ERR_PTR(-ENOENT); | |
f6bb4514 | 2558 | |
f0ad0860 | 2559 | it->mrt = mrt; |
1da177e4 LT |
2560 | it->cache = NULL; |
2561 | it->ct = 0; | |
f6bb4514 | 2562 | return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) |
1da177e4 LT |
2563 | : SEQ_START_TOKEN; |
2564 | } | |
2565 | ||
2566 | static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2567 | { | |
2568 | struct mfc_cache *mfc = v; | |
2569 | struct ipmr_mfc_iter *it = seq->private; | |
f6bb4514 | 2570 | struct net *net = seq_file_net(seq); |
f0ad0860 | 2571 | struct mr_table *mrt = it->mrt; |
1da177e4 LT |
2572 | |
2573 | ++*pos; | |
2574 | ||
2575 | if (v == SEQ_START_TOKEN) | |
f6bb4514 | 2576 | return ipmr_mfc_seq_idx(net, seq->private, 0); |
1da177e4 | 2577 | |
862465f2 PM |
2578 | if (mfc->list.next != it->cache) |
2579 | return list_entry(mfc->list.next, struct mfc_cache, list); | |
e905a9ed | 2580 | |
0c12295a | 2581 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 LT |
2582 | goto end_of_list; |
2583 | ||
0c12295a | 2584 | BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); |
1da177e4 LT |
2585 | |
2586 | while (++it->ct < MFC_LINES) { | |
0c12295a | 2587 | it->cache = &mrt->mfc_cache_array[it->ct]; |
862465f2 PM |
2588 | if (list_empty(it->cache)) |
2589 | continue; | |
2590 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 LT |
2591 | } |
2592 | ||
2593 | /* exhausted cache_array, show unresolved */ | |
a8c9486b | 2594 | rcu_read_unlock(); |
0c12295a | 2595 | it->cache = &mrt->mfc_unres_queue; |
1da177e4 | 2596 | it->ct = 0; |
e905a9ed | 2597 | |
1da177e4 | 2598 | spin_lock_bh(&mfc_unres_lock); |
862465f2 PM |
2599 | if (!list_empty(it->cache)) |
2600 | return list_first_entry(it->cache, struct mfc_cache, list); | |
1da177e4 | 2601 | |
a8cb16dd | 2602 | end_of_list: |
1da177e4 LT |
2603 | spin_unlock_bh(&mfc_unres_lock); |
2604 | it->cache = NULL; | |
2605 | ||
2606 | return NULL; | |
2607 | } | |
2608 | ||
2609 | static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) | |
2610 | { | |
2611 | struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2612 | struct mr_table *mrt = it->mrt; |
1da177e4 | 2613 | |
0c12295a | 2614 | if (it->cache == &mrt->mfc_unres_queue) |
1da177e4 | 2615 | spin_unlock_bh(&mfc_unres_lock); |
0c12295a | 2616 | else if (it->cache == &mrt->mfc_cache_array[it->ct]) |
a8c9486b | 2617 | rcu_read_unlock(); |
1da177e4 LT |
2618 | } |
2619 | ||
2620 | static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) | |
2621 | { | |
2622 | int n; | |
2623 | ||
2624 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2625 | seq_puts(seq, |
1da177e4 LT |
2626 | "Group Origin Iif Pkts Bytes Wrong Oifs\n"); |
2627 | } else { | |
2628 | const struct mfc_cache *mfc = v; | |
2629 | const struct ipmr_mfc_iter *it = seq->private; | |
f0ad0860 | 2630 | const struct mr_table *mrt = it->mrt; |
e905a9ed | 2631 | |
0eae88f3 ED |
2632 | seq_printf(seq, "%08X %08X %-3hd", |
2633 | (__force u32) mfc->mfc_mcastgrp, | |
2634 | (__force u32) mfc->mfc_origin, | |
1ea472e2 | 2635 | mfc->mfc_parent); |
1da177e4 | 2636 | |
0c12295a | 2637 | if (it->cache != &mrt->mfc_unres_queue) { |
1ea472e2 BT |
2638 | seq_printf(seq, " %8lu %8lu %8lu", |
2639 | mfc->mfc_un.res.pkt, | |
2640 | mfc->mfc_un.res.bytes, | |
2641 | mfc->mfc_un.res.wrong_if); | |
132adf54 | 2642 | for (n = mfc->mfc_un.res.minvif; |
a8cb16dd | 2643 | n < mfc->mfc_un.res.maxvif; n++) { |
0c12295a | 2644 | if (VIF_EXISTS(mrt, n) && |
cf958ae3 BT |
2645 | mfc->mfc_un.res.ttls[n] < 255) |
2646 | seq_printf(seq, | |
e905a9ed | 2647 | " %2d:%-3d", |
1da177e4 LT |
2648 | n, mfc->mfc_un.res.ttls[n]); |
2649 | } | |
1ea472e2 BT |
2650 | } else { |
2651 | /* unresolved mfc_caches don't contain | |
2652 | * pkt, bytes and wrong_if values | |
2653 | */ | |
2654 | seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); | |
1da177e4 LT |
2655 | } |
2656 | seq_putc(seq, '\n'); | |
2657 | } | |
2658 | return 0; | |
2659 | } | |
2660 | ||
f690808e | 2661 | static const struct seq_operations ipmr_mfc_seq_ops = { |
1da177e4 LT |
2662 | .start = ipmr_mfc_seq_start, |
2663 | .next = ipmr_mfc_seq_next, | |
2664 | .stop = ipmr_mfc_seq_stop, | |
2665 | .show = ipmr_mfc_seq_show, | |
2666 | }; | |
2667 | ||
2668 | static int ipmr_mfc_open(struct inode *inode, struct file *file) | |
2669 | { | |
f6bb4514 BT |
2670 | return seq_open_net(inode, file, &ipmr_mfc_seq_ops, |
2671 | sizeof(struct ipmr_mfc_iter)); | |
1da177e4 LT |
2672 | } |
2673 | ||
9a32144e | 2674 | static const struct file_operations ipmr_mfc_fops = { |
1da177e4 LT |
2675 | .owner = THIS_MODULE, |
2676 | .open = ipmr_mfc_open, | |
2677 | .read = seq_read, | |
2678 | .llseek = seq_lseek, | |
f6bb4514 | 2679 | .release = seq_release_net, |
1da177e4 | 2680 | }; |
e905a9ed | 2681 | #endif |
1da177e4 LT |
2682 | |
2683 | #ifdef CONFIG_IP_PIMSM_V2 | |
32613090 | 2684 | static const struct net_protocol pim_protocol = { |
1da177e4 | 2685 | .handler = pim_rcv, |
403dbb97 | 2686 | .netns_ok = 1, |
1da177e4 LT |
2687 | }; |
2688 | #endif | |
2689 | ||
2690 | ||
2691 | /* | |
2692 | * Setup for IP multicast routing | |
2693 | */ | |
cf958ae3 BT |
2694 | static int __net_init ipmr_net_init(struct net *net) |
2695 | { | |
f0ad0860 | 2696 | int err; |
cf958ae3 | 2697 | |
f0ad0860 PM |
2698 | err = ipmr_rules_init(net); |
2699 | if (err < 0) | |
cf958ae3 | 2700 | goto fail; |
f6bb4514 BT |
2701 | |
2702 | #ifdef CONFIG_PROC_FS | |
2703 | err = -ENOMEM; | |
d4beaa66 | 2704 | if (!proc_create("ip_mr_vif", 0, net->proc_net, &ipmr_vif_fops)) |
f6bb4514 | 2705 | goto proc_vif_fail; |
d4beaa66 | 2706 | if (!proc_create("ip_mr_cache", 0, net->proc_net, &ipmr_mfc_fops)) |
f6bb4514 BT |
2707 | goto proc_cache_fail; |
2708 | #endif | |
2bb8b26c BT |
2709 | return 0; |
2710 | ||
f6bb4514 BT |
2711 | #ifdef CONFIG_PROC_FS |
2712 | proc_cache_fail: | |
ece31ffd | 2713 | remove_proc_entry("ip_mr_vif", net->proc_net); |
f6bb4514 | 2714 | proc_vif_fail: |
f0ad0860 | 2715 | ipmr_rules_exit(net); |
f6bb4514 | 2716 | #endif |
cf958ae3 BT |
2717 | fail: |
2718 | return err; | |
2719 | } | |
2720 | ||
2721 | static void __net_exit ipmr_net_exit(struct net *net) | |
2722 | { | |
f6bb4514 | 2723 | #ifdef CONFIG_PROC_FS |
ece31ffd G |
2724 | remove_proc_entry("ip_mr_cache", net->proc_net); |
2725 | remove_proc_entry("ip_mr_vif", net->proc_net); | |
f6bb4514 | 2726 | #endif |
f0ad0860 | 2727 | ipmr_rules_exit(net); |
cf958ae3 BT |
2728 | } |
2729 | ||
2730 | static struct pernet_operations ipmr_net_ops = { | |
2731 | .init = ipmr_net_init, | |
2732 | .exit = ipmr_net_exit, | |
2733 | }; | |
e905a9ed | 2734 | |
03d2f897 | 2735 | int __init ip_mr_init(void) |
1da177e4 | 2736 | { |
03d2f897 WC |
2737 | int err; |
2738 | ||
1da177e4 LT |
2739 | mrt_cachep = kmem_cache_create("ip_mrt_cache", |
2740 | sizeof(struct mfc_cache), | |
a8c9486b | 2741 | 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, |
20c2df83 | 2742 | NULL); |
03d2f897 WC |
2743 | if (!mrt_cachep) |
2744 | return -ENOMEM; | |
2745 | ||
cf958ae3 BT |
2746 | err = register_pernet_subsys(&ipmr_net_ops); |
2747 | if (err) | |
2748 | goto reg_pernet_fail; | |
2749 | ||
03d2f897 WC |
2750 | err = register_netdevice_notifier(&ip_mr_notifier); |
2751 | if (err) | |
2752 | goto reg_notif_fail; | |
403dbb97 TG |
2753 | #ifdef CONFIG_IP_PIMSM_V2 |
2754 | if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { | |
058bd4d2 | 2755 | pr_err("%s: can't add PIM protocol\n", __func__); |
403dbb97 TG |
2756 | err = -EAGAIN; |
2757 | goto add_proto_fail; | |
2758 | } | |
2759 | #endif | |
c7ac8679 GR |
2760 | rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, |
2761 | NULL, ipmr_rtm_dumproute, NULL); | |
03d2f897 | 2762 | return 0; |
f6bb4514 | 2763 | |
403dbb97 TG |
2764 | #ifdef CONFIG_IP_PIMSM_V2 |
2765 | add_proto_fail: | |
2766 | unregister_netdevice_notifier(&ip_mr_notifier); | |
2767 | #endif | |
c3e38896 | 2768 | reg_notif_fail: |
cf958ae3 BT |
2769 | unregister_pernet_subsys(&ipmr_net_ops); |
2770 | reg_pernet_fail: | |
c3e38896 | 2771 | kmem_cache_destroy(mrt_cachep); |
03d2f897 | 2772 | return err; |
1da177e4 | 2773 | } |