Root/
1 | /* |
2 | * Multicast support for IPv6 |
3 | * Linux INET6 implementation |
4 | * |
5 | * Authors: |
6 | * Pedro Roque <roque@di.fc.ul.pt> |
7 | * |
8 | * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c |
9 | * |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License |
12 | * as published by the Free Software Foundation; either version |
13 | * 2 of the License, or (at your option) any later version. |
14 | */ |
15 | |
16 | /* Changes: |
17 | * |
18 | * yoshfuji : fix format of router-alert option |
19 | * YOSHIFUJI Hideaki @USAGI: |
20 | * Fixed source address for MLD message based on |
21 | * <draft-ietf-magma-mld-source-05.txt>. |
22 | * YOSHIFUJI Hideaki @USAGI: |
23 | * - Ignore Queries for invalid addresses. |
24 | * - MLD for link-local addresses. |
25 | * David L Stevens <dlstevens@us.ibm.com>: |
26 | * - MLDv2 support |
27 | */ |
28 | |
29 | #include <linux/module.h> |
30 | #include <linux/errno.h> |
31 | #include <linux/types.h> |
32 | #include <linux/string.h> |
33 | #include <linux/socket.h> |
34 | #include <linux/sockios.h> |
35 | #include <linux/jiffies.h> |
36 | #include <linux/times.h> |
37 | #include <linux/net.h> |
38 | #include <linux/in.h> |
39 | #include <linux/in6.h> |
40 | #include <linux/netdevice.h> |
41 | #include <linux/if_arp.h> |
42 | #include <linux/route.h> |
43 | #include <linux/init.h> |
44 | #include <linux/proc_fs.h> |
45 | #include <linux/seq_file.h> |
46 | #include <linux/slab.h> |
47 | #include <linux/pkt_sched.h> |
48 | #include <net/mld.h> |
49 | |
50 | #include <linux/netfilter.h> |
51 | #include <linux/netfilter_ipv6.h> |
52 | |
53 | #include <net/net_namespace.h> |
54 | #include <net/sock.h> |
55 | #include <net/snmp.h> |
56 | |
57 | #include <net/ipv6.h> |
58 | #include <net/protocol.h> |
59 | #include <net/if_inet6.h> |
60 | #include <net/ndisc.h> |
61 | #include <net/addrconf.h> |
62 | #include <net/ip6_route.h> |
63 | #include <net/inet_common.h> |
64 | |
65 | #include <net/ip6_checksum.h> |
66 | |
67 | /* Set to 3 to get tracing... */ |
68 | #define MCAST_DEBUG 2 |
69 | |
70 | #if MCAST_DEBUG >= 3 |
71 | #define MDBG(x) printk x |
72 | #else |
73 | #define MDBG(x) |
74 | #endif |
75 | |
76 | /* Ensure that we have struct in6_addr aligned on 32bit word. */ |
77 | static void *__mld2_query_bugs[] __attribute__((__unused__)) = { |
78 | BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4), |
79 | BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4), |
80 | BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4) |
81 | }; |
82 | |
83 | static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; |
84 | |
85 | /* Big mc list lock for all the sockets */ |
86 | static DEFINE_SPINLOCK(ipv6_sk_mc_lock); |
87 | |
88 | static void igmp6_join_group(struct ifmcaddr6 *ma); |
89 | static void igmp6_leave_group(struct ifmcaddr6 *ma); |
90 | static void igmp6_timer_handler(unsigned long data); |
91 | |
92 | static void mld_gq_timer_expire(unsigned long data); |
93 | static void mld_ifc_timer_expire(unsigned long data); |
94 | static void mld_ifc_event(struct inet6_dev *idev); |
95 | static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); |
96 | static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr); |
97 | static void mld_clear_delrec(struct inet6_dev *idev); |
98 | static bool mld_in_v1_mode(const struct inet6_dev *idev); |
99 | static int sf_setstate(struct ifmcaddr6 *pmc); |
100 | static void sf_markstate(struct ifmcaddr6 *pmc); |
101 | static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); |
102 | static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
103 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
104 | int delta); |
105 | static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
106 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
107 | int delta); |
108 | static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
109 | struct inet6_dev *idev); |
110 | |
111 | #define MLD_QRV_DEFAULT 2 |
112 | /* RFC3810, 9.2. Query Interval */ |
113 | #define MLD_QI_DEFAULT (125 * HZ) |
114 | /* RFC3810, 9.3. Query Response Interval */ |
115 | #define MLD_QRI_DEFAULT (10 * HZ) |
116 | |
117 | /* RFC3810, 8.1 Query Version Distinctions */ |
118 | #define MLD_V1_QUERY_LEN 24 |
119 | #define MLD_V2_QUERY_LEN_MIN 28 |
120 | |
121 | #define IPV6_MLD_MAX_MSF 64 |
122 | |
123 | int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; |
124 | |
125 | /* |
126 | * socket join on multicast group |
127 | */ |
128 | |
129 | #define for_each_pmc_rcu(np, pmc) \ |
130 | for (pmc = rcu_dereference(np->ipv6_mc_list); \ |
131 | pmc != NULL; \ |
132 | pmc = rcu_dereference(pmc->next)) |
133 | |
134 | static int unsolicited_report_interval(struct inet6_dev *idev) |
135 | { |
136 | int iv; |
137 | |
138 | if (mld_in_v1_mode(idev)) |
139 | iv = idev->cnf.mldv1_unsolicited_report_interval; |
140 | else |
141 | iv = idev->cnf.mldv2_unsolicited_report_interval; |
142 | |
143 | return iv > 0 ? iv : 1; |
144 | } |
145 | |
146 | int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
147 | { |
148 | struct net_device *dev = NULL; |
149 | struct ipv6_mc_socklist *mc_lst; |
150 | struct ipv6_pinfo *np = inet6_sk(sk); |
151 | struct net *net = sock_net(sk); |
152 | int err; |
153 | |
154 | if (!ipv6_addr_is_multicast(addr)) |
155 | return -EINVAL; |
156 | |
157 | rcu_read_lock(); |
158 | for_each_pmc_rcu(np, mc_lst) { |
159 | if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
160 | ipv6_addr_equal(&mc_lst->addr, addr)) { |
161 | rcu_read_unlock(); |
162 | return -EADDRINUSE; |
163 | } |
164 | } |
165 | rcu_read_unlock(); |
166 | |
167 | mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); |
168 | |
169 | if (mc_lst == NULL) |
170 | return -ENOMEM; |
171 | |
172 | mc_lst->next = NULL; |
173 | mc_lst->addr = *addr; |
174 | |
175 | rcu_read_lock(); |
176 | if (ifindex == 0) { |
177 | struct rt6_info *rt; |
178 | rt = rt6_lookup(net, addr, NULL, 0, 0); |
179 | if (rt) { |
180 | dev = rt->dst.dev; |
181 | ip6_rt_put(rt); |
182 | } |
183 | } else |
184 | dev = dev_get_by_index_rcu(net, ifindex); |
185 | |
186 | if (dev == NULL) { |
187 | rcu_read_unlock(); |
188 | sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
189 | return -ENODEV; |
190 | } |
191 | |
192 | mc_lst->ifindex = dev->ifindex; |
193 | mc_lst->sfmode = MCAST_EXCLUDE; |
194 | rwlock_init(&mc_lst->sflock); |
195 | mc_lst->sflist = NULL; |
196 | |
197 | /* |
198 | * now add/increase the group membership on the device |
199 | */ |
200 | |
201 | err = ipv6_dev_mc_inc(dev, addr); |
202 | |
203 | if (err) { |
204 | rcu_read_unlock(); |
205 | sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
206 | return err; |
207 | } |
208 | |
209 | spin_lock(&ipv6_sk_mc_lock); |
210 | mc_lst->next = np->ipv6_mc_list; |
211 | rcu_assign_pointer(np->ipv6_mc_list, mc_lst); |
212 | spin_unlock(&ipv6_sk_mc_lock); |
213 | |
214 | rcu_read_unlock(); |
215 | |
216 | return 0; |
217 | } |
218 | |
219 | /* |
220 | * socket leave on multicast group |
221 | */ |
222 | int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
223 | { |
224 | struct ipv6_pinfo *np = inet6_sk(sk); |
225 | struct ipv6_mc_socklist *mc_lst; |
226 | struct ipv6_mc_socklist __rcu **lnk; |
227 | struct net *net = sock_net(sk); |
228 | |
229 | if (!ipv6_addr_is_multicast(addr)) |
230 | return -EINVAL; |
231 | |
232 | spin_lock(&ipv6_sk_mc_lock); |
233 | for (lnk = &np->ipv6_mc_list; |
234 | (mc_lst = rcu_dereference_protected(*lnk, |
235 | lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ; |
236 | lnk = &mc_lst->next) { |
237 | if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
238 | ipv6_addr_equal(&mc_lst->addr, addr)) { |
239 | struct net_device *dev; |
240 | |
241 | *lnk = mc_lst->next; |
242 | spin_unlock(&ipv6_sk_mc_lock); |
243 | |
244 | rcu_read_lock(); |
245 | dev = dev_get_by_index_rcu(net, mc_lst->ifindex); |
246 | if (dev != NULL) { |
247 | struct inet6_dev *idev = __in6_dev_get(dev); |
248 | |
249 | (void) ip6_mc_leave_src(sk, mc_lst, idev); |
250 | if (idev) |
251 | __ipv6_dev_mc_dec(idev, &mc_lst->addr); |
252 | } else |
253 | (void) ip6_mc_leave_src(sk, mc_lst, NULL); |
254 | rcu_read_unlock(); |
255 | atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); |
256 | kfree_rcu(mc_lst, rcu); |
257 | return 0; |
258 | } |
259 | } |
260 | spin_unlock(&ipv6_sk_mc_lock); |
261 | |
262 | return -EADDRNOTAVAIL; |
263 | } |
264 | |
265 | /* called with rcu_read_lock() */ |
266 | static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, |
267 | const struct in6_addr *group, |
268 | int ifindex) |
269 | { |
270 | struct net_device *dev = NULL; |
271 | struct inet6_dev *idev = NULL; |
272 | |
273 | if (ifindex == 0) { |
274 | struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0); |
275 | |
276 | if (rt) { |
277 | dev = rt->dst.dev; |
278 | ip6_rt_put(rt); |
279 | } |
280 | } else |
281 | dev = dev_get_by_index_rcu(net, ifindex); |
282 | |
283 | if (!dev) |
284 | return NULL; |
285 | idev = __in6_dev_get(dev); |
286 | if (!idev) |
287 | return NULL; |
288 | read_lock_bh(&idev->lock); |
289 | if (idev->dead) { |
290 | read_unlock_bh(&idev->lock); |
291 | return NULL; |
292 | } |
293 | return idev; |
294 | } |
295 | |
296 | void ipv6_sock_mc_close(struct sock *sk) |
297 | { |
298 | struct ipv6_pinfo *np = inet6_sk(sk); |
299 | struct ipv6_mc_socklist *mc_lst; |
300 | struct net *net = sock_net(sk); |
301 | |
302 | if (!rcu_access_pointer(np->ipv6_mc_list)) |
303 | return; |
304 | |
305 | spin_lock(&ipv6_sk_mc_lock); |
306 | while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list, |
307 | lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) { |
308 | struct net_device *dev; |
309 | |
310 | np->ipv6_mc_list = mc_lst->next; |
311 | spin_unlock(&ipv6_sk_mc_lock); |
312 | |
313 | rcu_read_lock(); |
314 | dev = dev_get_by_index_rcu(net, mc_lst->ifindex); |
315 | if (dev) { |
316 | struct inet6_dev *idev = __in6_dev_get(dev); |
317 | |
318 | (void) ip6_mc_leave_src(sk, mc_lst, idev); |
319 | if (idev) |
320 | __ipv6_dev_mc_dec(idev, &mc_lst->addr); |
321 | } else |
322 | (void) ip6_mc_leave_src(sk, mc_lst, NULL); |
323 | rcu_read_unlock(); |
324 | |
325 | atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); |
326 | kfree_rcu(mc_lst, rcu); |
327 | |
328 | spin_lock(&ipv6_sk_mc_lock); |
329 | } |
330 | spin_unlock(&ipv6_sk_mc_lock); |
331 | } |
332 | |
333 | int ip6_mc_source(int add, int omode, struct sock *sk, |
334 | struct group_source_req *pgsr) |
335 | { |
336 | struct in6_addr *source, *group; |
337 | struct ipv6_mc_socklist *pmc; |
338 | struct inet6_dev *idev; |
339 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
340 | struct ip6_sf_socklist *psl; |
341 | struct net *net = sock_net(sk); |
342 | int i, j, rv; |
343 | int leavegroup = 0; |
344 | int pmclocked = 0; |
345 | int err; |
346 | |
347 | source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; |
348 | group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; |
349 | |
350 | if (!ipv6_addr_is_multicast(group)) |
351 | return -EINVAL; |
352 | |
353 | rcu_read_lock(); |
354 | idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); |
355 | if (!idev) { |
356 | rcu_read_unlock(); |
357 | return -ENODEV; |
358 | } |
359 | |
360 | err = -EADDRNOTAVAIL; |
361 | |
362 | for_each_pmc_rcu(inet6, pmc) { |
363 | if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) |
364 | continue; |
365 | if (ipv6_addr_equal(&pmc->addr, group)) |
366 | break; |
367 | } |
368 | if (!pmc) { /* must have a prior join */ |
369 | err = -EINVAL; |
370 | goto done; |
371 | } |
372 | /* if a source filter was set, must be the same mode as before */ |
373 | if (pmc->sflist) { |
374 | if (pmc->sfmode != omode) { |
375 | err = -EINVAL; |
376 | goto done; |
377 | } |
378 | } else if (pmc->sfmode != omode) { |
379 | /* allow mode switches for empty-set filters */ |
380 | ip6_mc_add_src(idev, group, omode, 0, NULL, 0); |
381 | ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); |
382 | pmc->sfmode = omode; |
383 | } |
384 | |
385 | write_lock(&pmc->sflock); |
386 | pmclocked = 1; |
387 | |
388 | psl = pmc->sflist; |
389 | if (!add) { |
390 | if (!psl) |
391 | goto done; /* err = -EADDRNOTAVAIL */ |
392 | rv = !0; |
393 | for (i=0; i<psl->sl_count; i++) { |
394 | rv = !ipv6_addr_equal(&psl->sl_addr[i], source); |
395 | if (rv == 0) |
396 | break; |
397 | } |
398 | if (rv) /* source not found */ |
399 | goto done; /* err = -EADDRNOTAVAIL */ |
400 | |
401 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
402 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { |
403 | leavegroup = 1; |
404 | goto done; |
405 | } |
406 | |
407 | /* update the interface filter */ |
408 | ip6_mc_del_src(idev, group, omode, 1, source, 1); |
409 | |
410 | for (j=i+1; j<psl->sl_count; j++) |
411 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
412 | psl->sl_count--; |
413 | err = 0; |
414 | goto done; |
415 | } |
416 | /* else, add a new source to the filter */ |
417 | |
418 | if (psl && psl->sl_count >= sysctl_mld_max_msf) { |
419 | err = -ENOBUFS; |
420 | goto done; |
421 | } |
422 | if (!psl || psl->sl_count == psl->sl_max) { |
423 | struct ip6_sf_socklist *newpsl; |
424 | int count = IP6_SFBLOCK; |
425 | |
426 | if (psl) |
427 | count += psl->sl_max; |
428 | newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); |
429 | if (!newpsl) { |
430 | err = -ENOBUFS; |
431 | goto done; |
432 | } |
433 | newpsl->sl_max = count; |
434 | newpsl->sl_count = count - IP6_SFBLOCK; |
435 | if (psl) { |
436 | for (i=0; i<psl->sl_count; i++) |
437 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
438 | sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); |
439 | } |
440 | pmc->sflist = psl = newpsl; |
441 | } |
442 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ |
443 | for (i=0; i<psl->sl_count; i++) { |
444 | rv = !ipv6_addr_equal(&psl->sl_addr[i], source); |
445 | if (rv == 0) /* There is an error in the address. */ |
446 | goto done; |
447 | } |
448 | for (j=psl->sl_count-1; j>=i; j--) |
449 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
450 | psl->sl_addr[i] = *source; |
451 | psl->sl_count++; |
452 | err = 0; |
453 | /* update the interface list */ |
454 | ip6_mc_add_src(idev, group, omode, 1, source, 1); |
455 | done: |
456 | if (pmclocked) |
457 | write_unlock(&pmc->sflock); |
458 | read_unlock_bh(&idev->lock); |
459 | rcu_read_unlock(); |
460 | if (leavegroup) |
461 | return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); |
462 | return err; |
463 | } |
464 | |
465 | int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) |
466 | { |
467 | const struct in6_addr *group; |
468 | struct ipv6_mc_socklist *pmc; |
469 | struct inet6_dev *idev; |
470 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
471 | struct ip6_sf_socklist *newpsl, *psl; |
472 | struct net *net = sock_net(sk); |
473 | int leavegroup = 0; |
474 | int i, err; |
475 | |
476 | group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
477 | |
478 | if (!ipv6_addr_is_multicast(group)) |
479 | return -EINVAL; |
480 | if (gsf->gf_fmode != MCAST_INCLUDE && |
481 | gsf->gf_fmode != MCAST_EXCLUDE) |
482 | return -EINVAL; |
483 | |
484 | rcu_read_lock(); |
485 | idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); |
486 | |
487 | if (!idev) { |
488 | rcu_read_unlock(); |
489 | return -ENODEV; |
490 | } |
491 | |
492 | err = 0; |
493 | |
494 | if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { |
495 | leavegroup = 1; |
496 | goto done; |
497 | } |
498 | |
499 | for_each_pmc_rcu(inet6, pmc) { |
500 | if (pmc->ifindex != gsf->gf_interface) |
501 | continue; |
502 | if (ipv6_addr_equal(&pmc->addr, group)) |
503 | break; |
504 | } |
505 | if (!pmc) { /* must have a prior join */ |
506 | err = -EINVAL; |
507 | goto done; |
508 | } |
509 | if (gsf->gf_numsrc) { |
510 | newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), |
511 | GFP_ATOMIC); |
512 | if (!newpsl) { |
513 | err = -ENOBUFS; |
514 | goto done; |
515 | } |
516 | newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; |
517 | for (i=0; i<newpsl->sl_count; ++i) { |
518 | struct sockaddr_in6 *psin6; |
519 | |
520 | psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; |
521 | newpsl->sl_addr[i] = psin6->sin6_addr; |
522 | } |
523 | err = ip6_mc_add_src(idev, group, gsf->gf_fmode, |
524 | newpsl->sl_count, newpsl->sl_addr, 0); |
525 | if (err) { |
526 | sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); |
527 | goto done; |
528 | } |
529 | } else { |
530 | newpsl = NULL; |
531 | (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); |
532 | } |
533 | |
534 | write_lock(&pmc->sflock); |
535 | psl = pmc->sflist; |
536 | if (psl) { |
537 | (void) ip6_mc_del_src(idev, group, pmc->sfmode, |
538 | psl->sl_count, psl->sl_addr, 0); |
539 | sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); |
540 | } else |
541 | (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); |
542 | pmc->sflist = newpsl; |
543 | pmc->sfmode = gsf->gf_fmode; |
544 | write_unlock(&pmc->sflock); |
545 | err = 0; |
546 | done: |
547 | read_unlock_bh(&idev->lock); |
548 | rcu_read_unlock(); |
549 | if (leavegroup) |
550 | err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); |
551 | return err; |
552 | } |
553 | |
554 | int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, |
555 | struct group_filter __user *optval, int __user *optlen) |
556 | { |
557 | int err, i, count, copycount; |
558 | const struct in6_addr *group; |
559 | struct ipv6_mc_socklist *pmc; |
560 | struct inet6_dev *idev; |
561 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
562 | struct ip6_sf_socklist *psl; |
563 | struct net *net = sock_net(sk); |
564 | |
565 | group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
566 | |
567 | if (!ipv6_addr_is_multicast(group)) |
568 | return -EINVAL; |
569 | |
570 | rcu_read_lock(); |
571 | idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); |
572 | |
573 | if (!idev) { |
574 | rcu_read_unlock(); |
575 | return -ENODEV; |
576 | } |
577 | |
578 | err = -EADDRNOTAVAIL; |
579 | /* |
580 | * changes to the ipv6_mc_list require the socket lock and |
581 | * a read lock on ip6_sk_mc_lock. We have the socket lock, |
582 | * so reading the list is safe. |
583 | */ |
584 | |
585 | for_each_pmc_rcu(inet6, pmc) { |
586 | if (pmc->ifindex != gsf->gf_interface) |
587 | continue; |
588 | if (ipv6_addr_equal(group, &pmc->addr)) |
589 | break; |
590 | } |
591 | if (!pmc) /* must have a prior join */ |
592 | goto done; |
593 | gsf->gf_fmode = pmc->sfmode; |
594 | psl = pmc->sflist; |
595 | count = psl ? psl->sl_count : 0; |
596 | read_unlock_bh(&idev->lock); |
597 | rcu_read_unlock(); |
598 | |
599 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; |
600 | gsf->gf_numsrc = count; |
601 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || |
602 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { |
603 | return -EFAULT; |
604 | } |
605 | /* changes to psl require the socket lock, a read lock on |
606 | * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We |
607 | * have the socket lock, so reading here is safe. |
608 | */ |
609 | for (i=0; i<copycount; i++) { |
610 | struct sockaddr_in6 *psin6; |
611 | struct sockaddr_storage ss; |
612 | |
613 | psin6 = (struct sockaddr_in6 *)&ss; |
614 | memset(&ss, 0, sizeof(ss)); |
615 | psin6->sin6_family = AF_INET6; |
616 | psin6->sin6_addr = psl->sl_addr[i]; |
617 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) |
618 | return -EFAULT; |
619 | } |
620 | return 0; |
621 | done: |
622 | read_unlock_bh(&idev->lock); |
623 | rcu_read_unlock(); |
624 | return err; |
625 | } |
626 | |
627 | bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, |
628 | const struct in6_addr *src_addr) |
629 | { |
630 | struct ipv6_pinfo *np = inet6_sk(sk); |
631 | struct ipv6_mc_socklist *mc; |
632 | struct ip6_sf_socklist *psl; |
633 | bool rv = true; |
634 | |
635 | rcu_read_lock(); |
636 | for_each_pmc_rcu(np, mc) { |
637 | if (ipv6_addr_equal(&mc->addr, mc_addr)) |
638 | break; |
639 | } |
640 | if (!mc) { |
641 | rcu_read_unlock(); |
642 | return true; |
643 | } |
644 | read_lock(&mc->sflock); |
645 | psl = mc->sflist; |
646 | if (!psl) { |
647 | rv = mc->sfmode == MCAST_EXCLUDE; |
648 | } else { |
649 | int i; |
650 | |
651 | for (i=0; i<psl->sl_count; i++) { |
652 | if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) |
653 | break; |
654 | } |
655 | if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
656 | rv = false; |
657 | if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
658 | rv = false; |
659 | } |
660 | read_unlock(&mc->sflock); |
661 | rcu_read_unlock(); |
662 | |
663 | return rv; |
664 | } |
665 | |
666 | static void ma_put(struct ifmcaddr6 *mc) |
667 | { |
668 | if (atomic_dec_and_test(&mc->mca_refcnt)) { |
669 | in6_dev_put(mc->idev); |
670 | kfree(mc); |
671 | } |
672 | } |
673 | |
674 | static void igmp6_group_added(struct ifmcaddr6 *mc) |
675 | { |
676 | struct net_device *dev = mc->idev->dev; |
677 | char buf[MAX_ADDR_LEN]; |
678 | |
679 | if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < |
680 | IPV6_ADDR_SCOPE_LINKLOCAL) |
681 | return; |
682 | |
683 | spin_lock_bh(&mc->mca_lock); |
684 | if (!(mc->mca_flags&MAF_LOADED)) { |
685 | mc->mca_flags |= MAF_LOADED; |
686 | if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) |
687 | dev_mc_add(dev, buf); |
688 | } |
689 | spin_unlock_bh(&mc->mca_lock); |
690 | |
691 | if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) |
692 | return; |
693 | |
694 | if (mld_in_v1_mode(mc->idev)) { |
695 | igmp6_join_group(mc); |
696 | return; |
697 | } |
698 | /* else v2 */ |
699 | |
700 | mc->mca_crcount = mc->idev->mc_qrv; |
701 | mld_ifc_event(mc->idev); |
702 | } |
703 | |
704 | static void igmp6_group_dropped(struct ifmcaddr6 *mc) |
705 | { |
706 | struct net_device *dev = mc->idev->dev; |
707 | char buf[MAX_ADDR_LEN]; |
708 | |
709 | if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < |
710 | IPV6_ADDR_SCOPE_LINKLOCAL) |
711 | return; |
712 | |
713 | spin_lock_bh(&mc->mca_lock); |
714 | if (mc->mca_flags&MAF_LOADED) { |
715 | mc->mca_flags &= ~MAF_LOADED; |
716 | if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) |
717 | dev_mc_del(dev, buf); |
718 | } |
719 | |
720 | if (mc->mca_flags & MAF_NOREPORT) |
721 | goto done; |
722 | spin_unlock_bh(&mc->mca_lock); |
723 | |
724 | if (!mc->idev->dead) |
725 | igmp6_leave_group(mc); |
726 | |
727 | spin_lock_bh(&mc->mca_lock); |
728 | if (del_timer(&mc->mca_timer)) |
729 | atomic_dec(&mc->mca_refcnt); |
730 | done: |
731 | ip6_mc_clear_src(mc); |
732 | spin_unlock_bh(&mc->mca_lock); |
733 | } |
734 | |
735 | /* |
736 | * deleted ifmcaddr6 manipulation |
737 | */ |
738 | static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) |
739 | { |
740 | struct ifmcaddr6 *pmc; |
741 | |
742 | /* this is an "ifmcaddr6" for convenience; only the fields below |
743 | * are actually used. In particular, the refcnt and users are not |
744 | * used for management of the delete list. Using the same structure |
745 | * for deleted items allows change reports to use common code with |
746 | * non-deleted or query-response MCA's. |
747 | */ |
748 | pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); |
749 | if (!pmc) |
750 | return; |
751 | |
752 | spin_lock_bh(&im->mca_lock); |
753 | spin_lock_init(&pmc->mca_lock); |
754 | pmc->idev = im->idev; |
755 | in6_dev_hold(idev); |
756 | pmc->mca_addr = im->mca_addr; |
757 | pmc->mca_crcount = idev->mc_qrv; |
758 | pmc->mca_sfmode = im->mca_sfmode; |
759 | if (pmc->mca_sfmode == MCAST_INCLUDE) { |
760 | struct ip6_sf_list *psf; |
761 | |
762 | pmc->mca_tomb = im->mca_tomb; |
763 | pmc->mca_sources = im->mca_sources; |
764 | im->mca_tomb = im->mca_sources = NULL; |
765 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) |
766 | psf->sf_crcount = pmc->mca_crcount; |
767 | } |
768 | spin_unlock_bh(&im->mca_lock); |
769 | |
770 | spin_lock_bh(&idev->mc_lock); |
771 | pmc->next = idev->mc_tomb; |
772 | idev->mc_tomb = pmc; |
773 | spin_unlock_bh(&idev->mc_lock); |
774 | } |
775 | |
776 | static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca) |
777 | { |
778 | struct ifmcaddr6 *pmc, *pmc_prev; |
779 | struct ip6_sf_list *psf, *psf_next; |
780 | |
781 | spin_lock_bh(&idev->mc_lock); |
782 | pmc_prev = NULL; |
783 | for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { |
784 | if (ipv6_addr_equal(&pmc->mca_addr, pmca)) |
785 | break; |
786 | pmc_prev = pmc; |
787 | } |
788 | if (pmc) { |
789 | if (pmc_prev) |
790 | pmc_prev->next = pmc->next; |
791 | else |
792 | idev->mc_tomb = pmc->next; |
793 | } |
794 | spin_unlock_bh(&idev->mc_lock); |
795 | |
796 | if (pmc) { |
797 | for (psf=pmc->mca_tomb; psf; psf=psf_next) { |
798 | psf_next = psf->sf_next; |
799 | kfree(psf); |
800 | } |
801 | in6_dev_put(pmc->idev); |
802 | kfree(pmc); |
803 | } |
804 | } |
805 | |
806 | static void mld_clear_delrec(struct inet6_dev *idev) |
807 | { |
808 | struct ifmcaddr6 *pmc, *nextpmc; |
809 | |
810 | spin_lock_bh(&idev->mc_lock); |
811 | pmc = idev->mc_tomb; |
812 | idev->mc_tomb = NULL; |
813 | spin_unlock_bh(&idev->mc_lock); |
814 | |
815 | for (; pmc; pmc = nextpmc) { |
816 | nextpmc = pmc->next; |
817 | ip6_mc_clear_src(pmc); |
818 | in6_dev_put(pmc->idev); |
819 | kfree(pmc); |
820 | } |
821 | |
822 | /* clear dead sources, too */ |
823 | read_lock_bh(&idev->lock); |
824 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
825 | struct ip6_sf_list *psf, *psf_next; |
826 | |
827 | spin_lock_bh(&pmc->mca_lock); |
828 | psf = pmc->mca_tomb; |
829 | pmc->mca_tomb = NULL; |
830 | spin_unlock_bh(&pmc->mca_lock); |
831 | for (; psf; psf=psf_next) { |
832 | psf_next = psf->sf_next; |
833 | kfree(psf); |
834 | } |
835 | } |
836 | read_unlock_bh(&idev->lock); |
837 | } |
838 | |
839 | |
840 | /* |
841 | * device multicast group inc (add if not found) |
842 | */ |
843 | int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) |
844 | { |
845 | struct ifmcaddr6 *mc; |
846 | struct inet6_dev *idev; |
847 | |
848 | /* we need to take a reference on idev */ |
849 | idev = in6_dev_get(dev); |
850 | |
851 | if (idev == NULL) |
852 | return -EINVAL; |
853 | |
854 | write_lock_bh(&idev->lock); |
855 | if (idev->dead) { |
856 | write_unlock_bh(&idev->lock); |
857 | in6_dev_put(idev); |
858 | return -ENODEV; |
859 | } |
860 | |
861 | for (mc = idev->mc_list; mc; mc = mc->next) { |
862 | if (ipv6_addr_equal(&mc->mca_addr, addr)) { |
863 | mc->mca_users++; |
864 | write_unlock_bh(&idev->lock); |
865 | ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, |
866 | NULL, 0); |
867 | in6_dev_put(idev); |
868 | return 0; |
869 | } |
870 | } |
871 | |
872 | /* |
873 | * not found: create a new one. |
874 | */ |
875 | |
876 | mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); |
877 | |
878 | if (mc == NULL) { |
879 | write_unlock_bh(&idev->lock); |
880 | in6_dev_put(idev); |
881 | return -ENOMEM; |
882 | } |
883 | |
884 | setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc); |
885 | |
886 | mc->mca_addr = *addr; |
887 | mc->idev = idev; /* (reference taken) */ |
888 | mc->mca_users = 1; |
889 | /* mca_stamp should be updated upon changes */ |
890 | mc->mca_cstamp = mc->mca_tstamp = jiffies; |
891 | atomic_set(&mc->mca_refcnt, 2); |
892 | spin_lock_init(&mc->mca_lock); |
893 | |
894 | /* initial mode is (EX, empty) */ |
895 | mc->mca_sfmode = MCAST_EXCLUDE; |
896 | mc->mca_sfcount[MCAST_EXCLUDE] = 1; |
897 | |
898 | if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || |
899 | IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
900 | mc->mca_flags |= MAF_NOREPORT; |
901 | |
902 | mc->next = idev->mc_list; |
903 | idev->mc_list = mc; |
904 | write_unlock_bh(&idev->lock); |
905 | |
906 | mld_del_delrec(idev, &mc->mca_addr); |
907 | igmp6_group_added(mc); |
908 | ma_put(mc); |
909 | return 0; |
910 | } |
911 | |
912 | /* |
913 | * device multicast group del |
914 | */ |
915 | int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
916 | { |
917 | struct ifmcaddr6 *ma, **map; |
918 | |
919 | write_lock_bh(&idev->lock); |
920 | for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { |
921 | if (ipv6_addr_equal(&ma->mca_addr, addr)) { |
922 | if (--ma->mca_users == 0) { |
923 | *map = ma->next; |
924 | write_unlock_bh(&idev->lock); |
925 | |
926 | igmp6_group_dropped(ma); |
927 | |
928 | ma_put(ma); |
929 | return 0; |
930 | } |
931 | write_unlock_bh(&idev->lock); |
932 | return 0; |
933 | } |
934 | } |
935 | write_unlock_bh(&idev->lock); |
936 | |
937 | return -ENOENT; |
938 | } |
939 | |
940 | int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) |
941 | { |
942 | struct inet6_dev *idev; |
943 | int err; |
944 | |
945 | rcu_read_lock(); |
946 | |
947 | idev = __in6_dev_get(dev); |
948 | if (!idev) |
949 | err = -ENODEV; |
950 | else |
951 | err = __ipv6_dev_mc_dec(idev, addr); |
952 | |
953 | rcu_read_unlock(); |
954 | return err; |
955 | } |
956 | |
957 | /* |
958 | * check if the interface/address pair is valid |
959 | */ |
960 | bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, |
961 | const struct in6_addr *src_addr) |
962 | { |
963 | struct inet6_dev *idev; |
964 | struct ifmcaddr6 *mc; |
965 | bool rv = false; |
966 | |
967 | rcu_read_lock(); |
968 | idev = __in6_dev_get(dev); |
969 | if (idev) { |
970 | read_lock_bh(&idev->lock); |
971 | for (mc = idev->mc_list; mc; mc=mc->next) { |
972 | if (ipv6_addr_equal(&mc->mca_addr, group)) |
973 | break; |
974 | } |
975 | if (mc) { |
976 | if (src_addr && !ipv6_addr_any(src_addr)) { |
977 | struct ip6_sf_list *psf; |
978 | |
979 | spin_lock_bh(&mc->mca_lock); |
980 | for (psf=mc->mca_sources;psf;psf=psf->sf_next) { |
981 | if (ipv6_addr_equal(&psf->sf_addr, src_addr)) |
982 | break; |
983 | } |
984 | if (psf) |
985 | rv = psf->sf_count[MCAST_INCLUDE] || |
986 | psf->sf_count[MCAST_EXCLUDE] != |
987 | mc->mca_sfcount[MCAST_EXCLUDE]; |
988 | else |
989 | rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; |
990 | spin_unlock_bh(&mc->mca_lock); |
991 | } else |
992 | rv = true; /* don't filter unspecified source */ |
993 | } |
994 | read_unlock_bh(&idev->lock); |
995 | } |
996 | rcu_read_unlock(); |
997 | return rv; |
998 | } |
999 | |
1000 | static void mld_gq_start_timer(struct inet6_dev *idev) |
1001 | { |
1002 | unsigned long tv = prandom_u32() % idev->mc_maxdelay; |
1003 | |
1004 | idev->mc_gq_running = 1; |
1005 | if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) |
1006 | in6_dev_hold(idev); |
1007 | } |
1008 | |
1009 | static void mld_gq_stop_timer(struct inet6_dev *idev) |
1010 | { |
1011 | idev->mc_gq_running = 0; |
1012 | if (del_timer(&idev->mc_gq_timer)) |
1013 | __in6_dev_put(idev); |
1014 | } |
1015 | |
1016 | static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) |
1017 | { |
1018 | unsigned long tv = prandom_u32() % delay; |
1019 | |
1020 | if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) |
1021 | in6_dev_hold(idev); |
1022 | } |
1023 | |
1024 | static void mld_ifc_stop_timer(struct inet6_dev *idev) |
1025 | { |
1026 | idev->mc_ifc_count = 0; |
1027 | if (del_timer(&idev->mc_ifc_timer)) |
1028 | __in6_dev_put(idev); |
1029 | } |
1030 | |
1031 | static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) |
1032 | { |
1033 | unsigned long tv = prandom_u32() % delay; |
1034 | |
1035 | if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) |
1036 | in6_dev_hold(idev); |
1037 | } |
1038 | |
1039 | static void mld_dad_stop_timer(struct inet6_dev *idev) |
1040 | { |
1041 | if (del_timer(&idev->mc_dad_timer)) |
1042 | __in6_dev_put(idev); |
1043 | } |
1044 | |
1045 | /* |
1046 | * IGMP handling (alias multicast ICMPv6 messages) |
1047 | */ |
1048 | |
1049 | static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) |
1050 | { |
1051 | unsigned long delay = resptime; |
1052 | |
1053 | /* Do not start timer for these addresses */ |
1054 | if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || |
1055 | IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
1056 | return; |
1057 | |
1058 | if (del_timer(&ma->mca_timer)) { |
1059 | atomic_dec(&ma->mca_refcnt); |
1060 | delay = ma->mca_timer.expires - jiffies; |
1061 | } |
1062 | |
1063 | if (delay >= resptime) |
1064 | delay = prandom_u32() % resptime; |
1065 | |
1066 | ma->mca_timer.expires = jiffies + delay; |
1067 | if (!mod_timer(&ma->mca_timer, jiffies + delay)) |
1068 | atomic_inc(&ma->mca_refcnt); |
1069 | ma->mca_flags |= MAF_TIMER_RUNNING; |
1070 | } |
1071 | |
1072 | /* mark EXCLUDE-mode sources */ |
1073 | static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, |
1074 | const struct in6_addr *srcs) |
1075 | { |
1076 | struct ip6_sf_list *psf; |
1077 | int i, scount; |
1078 | |
1079 | scount = 0; |
1080 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
1081 | if (scount == nsrcs) |
1082 | break; |
1083 | for (i=0; i<nsrcs; i++) { |
1084 | /* skip inactive filters */ |
1085 | if (psf->sf_count[MCAST_INCLUDE] || |
1086 | pmc->mca_sfcount[MCAST_EXCLUDE] != |
1087 | psf->sf_count[MCAST_EXCLUDE]) |
1088 | break; |
1089 | if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { |
1090 | scount++; |
1091 | break; |
1092 | } |
1093 | } |
1094 | } |
1095 | pmc->mca_flags &= ~MAF_GSQUERY; |
1096 | if (scount == nsrcs) /* all sources excluded */ |
1097 | return false; |
1098 | return true; |
1099 | } |
1100 | |
1101 | static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, |
1102 | const struct in6_addr *srcs) |
1103 | { |
1104 | struct ip6_sf_list *psf; |
1105 | int i, scount; |
1106 | |
1107 | if (pmc->mca_sfmode == MCAST_EXCLUDE) |
1108 | return mld_xmarksources(pmc, nsrcs, srcs); |
1109 | |
1110 | /* mark INCLUDE-mode sources */ |
1111 | |
1112 | scount = 0; |
1113 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
1114 | if (scount == nsrcs) |
1115 | break; |
1116 | for (i=0; i<nsrcs; i++) { |
1117 | if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { |
1118 | psf->sf_gsresp = 1; |
1119 | scount++; |
1120 | break; |
1121 | } |
1122 | } |
1123 | } |
1124 | if (!scount) { |
1125 | pmc->mca_flags &= ~MAF_GSQUERY; |
1126 | return false; |
1127 | } |
1128 | pmc->mca_flags |= MAF_GSQUERY; |
1129 | return true; |
1130 | } |
1131 | |
1132 | static int mld_force_mld_version(const struct inet6_dev *idev) |
1133 | { |
1134 | /* Normally, both are 0 here. If enforcement to a particular is |
1135 | * being used, individual device enforcement will have a lower |
1136 | * precedence over 'all' device (.../conf/all/force_mld_version). |
1137 | */ |
1138 | |
1139 | if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) |
1140 | return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; |
1141 | else |
1142 | return idev->cnf.force_mld_version; |
1143 | } |
1144 | |
1145 | static bool mld_in_v2_mode_only(const struct inet6_dev *idev) |
1146 | { |
1147 | return mld_force_mld_version(idev) == 2; |
1148 | } |
1149 | |
1150 | static bool mld_in_v1_mode_only(const struct inet6_dev *idev) |
1151 | { |
1152 | return mld_force_mld_version(idev) == 1; |
1153 | } |
1154 | |
1155 | static bool mld_in_v1_mode(const struct inet6_dev *idev) |
1156 | { |
1157 | if (mld_in_v2_mode_only(idev)) |
1158 | return false; |
1159 | if (mld_in_v1_mode_only(idev)) |
1160 | return true; |
1161 | if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) |
1162 | return true; |
1163 | |
1164 | return false; |
1165 | } |
1166 | |
1167 | static void mld_set_v1_mode(struct inet6_dev *idev) |
1168 | { |
1169 | /* RFC3810, relevant sections: |
1170 | * - 9.1. Robustness Variable |
1171 | * - 9.2. Query Interval |
1172 | * - 9.3. Query Response Interval |
1173 | * - 9.12. Older Version Querier Present Timeout |
1174 | */ |
1175 | unsigned long switchback; |
1176 | |
1177 | switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; |
1178 | |
1179 | idev->mc_v1_seen = jiffies + switchback; |
1180 | } |
1181 | |
1182 | static void mld_update_qrv(struct inet6_dev *idev, |
1183 | const struct mld2_query *mlh2) |
1184 | { |
1185 | /* RFC3810, relevant sections: |
1186 | * - 5.1.8. QRV (Querier's Robustness Variable) |
1187 | * - 9.1. Robustness Variable |
1188 | */ |
1189 | |
1190 | /* The value of the Robustness Variable MUST NOT be zero, |
1191 | * and SHOULD NOT be one. Catch this here if we ever run |
1192 | * into such a case in future. |
1193 | */ |
1194 | WARN_ON(idev->mc_qrv == 0); |
1195 | |
1196 | if (mlh2->mld2q_qrv > 0) |
1197 | idev->mc_qrv = mlh2->mld2q_qrv; |
1198 | |
1199 | if (unlikely(idev->mc_qrv < 2)) { |
1200 | net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", |
1201 | idev->mc_qrv, MLD_QRV_DEFAULT); |
1202 | idev->mc_qrv = MLD_QRV_DEFAULT; |
1203 | } |
1204 | } |
1205 | |
1206 | static void mld_update_qi(struct inet6_dev *idev, |
1207 | const struct mld2_query *mlh2) |
1208 | { |
1209 | /* RFC3810, relevant sections: |
1210 | * - 5.1.9. QQIC (Querier's Query Interval Code) |
1211 | * - 9.2. Query Interval |
1212 | * - 9.12. Older Version Querier Present Timeout |
1213 | * (the [Query Interval] in the last Query received) |
1214 | */ |
1215 | unsigned long mc_qqi; |
1216 | |
1217 | if (mlh2->mld2q_qqic < 128) { |
1218 | mc_qqi = mlh2->mld2q_qqic; |
1219 | } else { |
1220 | unsigned long mc_man, mc_exp; |
1221 | |
1222 | mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); |
1223 | mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); |
1224 | |
1225 | mc_qqi = (mc_man | 0x10) << (mc_exp + 3); |
1226 | } |
1227 | |
1228 | idev->mc_qi = mc_qqi * HZ; |
1229 | } |
1230 | |
1231 | static void mld_update_qri(struct inet6_dev *idev, |
1232 | const struct mld2_query *mlh2) |
1233 | { |
1234 | /* RFC3810, relevant sections: |
1235 | * - 5.1.3. Maximum Response Code |
1236 | * - 9.3. Query Response Interval |
1237 | */ |
1238 | idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); |
1239 | } |
1240 | |
1241 | static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, |
1242 | unsigned long *max_delay) |
1243 | { |
1244 | unsigned long mldv1_md; |
1245 | |
1246 | /* Ignore v1 queries */ |
1247 | if (mld_in_v2_mode_only(idev)) |
1248 | return -EINVAL; |
1249 | |
1250 | /* MLDv1 router present */ |
1251 | mldv1_md = ntohs(mld->mld_maxdelay); |
1252 | *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); |
1253 | |
1254 | mld_set_v1_mode(idev); |
1255 | |
1256 | /* cancel MLDv2 report timer */ |
1257 | mld_gq_stop_timer(idev); |
1258 | /* cancel the interface change timer */ |
1259 | mld_ifc_stop_timer(idev); |
1260 | /* clear deleted report items */ |
1261 | mld_clear_delrec(idev); |
1262 | |
1263 | return 0; |
1264 | } |
1265 | |
1266 | static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, |
1267 | unsigned long *max_delay) |
1268 | { |
1269 | /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */ |
1270 | if (mld_in_v1_mode(idev)) |
1271 | return -EINVAL; |
1272 | |
1273 | *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); |
1274 | |
1275 | mld_update_qrv(idev, mld); |
1276 | mld_update_qi(idev, mld); |
1277 | mld_update_qri(idev, mld); |
1278 | |
1279 | idev->mc_maxdelay = *max_delay; |
1280 | |
1281 | return 0; |
1282 | } |
1283 | |
1284 | /* called with rcu_read_lock() */ |
1285 | int igmp6_event_query(struct sk_buff *skb) |
1286 | { |
1287 | struct mld2_query *mlh2 = NULL; |
1288 | struct ifmcaddr6 *ma; |
1289 | const struct in6_addr *group; |
1290 | unsigned long max_delay; |
1291 | struct inet6_dev *idev; |
1292 | struct mld_msg *mld; |
1293 | int group_type; |
1294 | int mark = 0; |
1295 | int len, err; |
1296 | |
1297 | if (!pskb_may_pull(skb, sizeof(struct in6_addr))) |
1298 | return -EINVAL; |
1299 | |
1300 | /* compute payload length excluding extension headers */ |
1301 | len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); |
1302 | len -= skb_network_header_len(skb); |
1303 | |
1304 | /* Drop queries with not link local source */ |
1305 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) |
1306 | return -EINVAL; |
1307 | |
1308 | idev = __in6_dev_get(skb->dev); |
1309 | if (idev == NULL) |
1310 | return 0; |
1311 | |
1312 | mld = (struct mld_msg *)icmp6_hdr(skb); |
1313 | group = &mld->mld_mca; |
1314 | group_type = ipv6_addr_type(group); |
1315 | |
1316 | if (group_type != IPV6_ADDR_ANY && |
1317 | !(group_type&IPV6_ADDR_MULTICAST)) |
1318 | return -EINVAL; |
1319 | |
1320 | if (len == MLD_V1_QUERY_LEN) { |
1321 | err = mld_process_v1(idev, mld, &max_delay); |
1322 | if (err < 0) |
1323 | return err; |
1324 | } else if (len >= MLD_V2_QUERY_LEN_MIN) { |
1325 | int srcs_offset = sizeof(struct mld2_query) - |
1326 | sizeof(struct icmp6hdr); |
1327 | |
1328 | if (!pskb_may_pull(skb, srcs_offset)) |
1329 | return -EINVAL; |
1330 | |
1331 | mlh2 = (struct mld2_query *)skb_transport_header(skb); |
1332 | |
1333 | err = mld_process_v2(idev, mlh2, &max_delay); |
1334 | if (err < 0) |
1335 | return err; |
1336 | |
1337 | if (group_type == IPV6_ADDR_ANY) { /* general query */ |
1338 | if (mlh2->mld2q_nsrcs) |
1339 | return -EINVAL; /* no sources allowed */ |
1340 | |
1341 | mld_gq_start_timer(idev); |
1342 | return 0; |
1343 | } |
1344 | /* mark sources to include, if group & source-specific */ |
1345 | if (mlh2->mld2q_nsrcs != 0) { |
1346 | if (!pskb_may_pull(skb, srcs_offset + |
1347 | ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) |
1348 | return -EINVAL; |
1349 | |
1350 | mlh2 = (struct mld2_query *)skb_transport_header(skb); |
1351 | mark = 1; |
1352 | } |
1353 | } else |
1354 | return -EINVAL; |
1355 | |
1356 | read_lock_bh(&idev->lock); |
1357 | if (group_type == IPV6_ADDR_ANY) { |
1358 | for (ma = idev->mc_list; ma; ma=ma->next) { |
1359 | spin_lock_bh(&ma->mca_lock); |
1360 | igmp6_group_queried(ma, max_delay); |
1361 | spin_unlock_bh(&ma->mca_lock); |
1362 | } |
1363 | } else { |
1364 | for (ma = idev->mc_list; ma; ma=ma->next) { |
1365 | if (!ipv6_addr_equal(group, &ma->mca_addr)) |
1366 | continue; |
1367 | spin_lock_bh(&ma->mca_lock); |
1368 | if (ma->mca_flags & MAF_TIMER_RUNNING) { |
1369 | /* gsquery <- gsquery && mark */ |
1370 | if (!mark) |
1371 | ma->mca_flags &= ~MAF_GSQUERY; |
1372 | } else { |
1373 | /* gsquery <- mark */ |
1374 | if (mark) |
1375 | ma->mca_flags |= MAF_GSQUERY; |
1376 | else |
1377 | ma->mca_flags &= ~MAF_GSQUERY; |
1378 | } |
1379 | if (!(ma->mca_flags & MAF_GSQUERY) || |
1380 | mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) |
1381 | igmp6_group_queried(ma, max_delay); |
1382 | spin_unlock_bh(&ma->mca_lock); |
1383 | break; |
1384 | } |
1385 | } |
1386 | read_unlock_bh(&idev->lock); |
1387 | |
1388 | return 0; |
1389 | } |
1390 | |
1391 | /* called with rcu_read_lock() */ |
1392 | int igmp6_event_report(struct sk_buff *skb) |
1393 | { |
1394 | struct ifmcaddr6 *ma; |
1395 | struct inet6_dev *idev; |
1396 | struct mld_msg *mld; |
1397 | int addr_type; |
1398 | |
1399 | /* Our own report looped back. Ignore it. */ |
1400 | if (skb->pkt_type == PACKET_LOOPBACK) |
1401 | return 0; |
1402 | |
1403 | /* send our report if the MC router may not have heard this report */ |
1404 | if (skb->pkt_type != PACKET_MULTICAST && |
1405 | skb->pkt_type != PACKET_BROADCAST) |
1406 | return 0; |
1407 | |
1408 | if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) |
1409 | return -EINVAL; |
1410 | |
1411 | mld = (struct mld_msg *)icmp6_hdr(skb); |
1412 | |
1413 | /* Drop reports with not link local source */ |
1414 | addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); |
1415 | if (addr_type != IPV6_ADDR_ANY && |
1416 | !(addr_type&IPV6_ADDR_LINKLOCAL)) |
1417 | return -EINVAL; |
1418 | |
1419 | idev = __in6_dev_get(skb->dev); |
1420 | if (idev == NULL) |
1421 | return -ENODEV; |
1422 | |
1423 | /* |
1424 | * Cancel the timer for this group |
1425 | */ |
1426 | |
1427 | read_lock_bh(&idev->lock); |
1428 | for (ma = idev->mc_list; ma; ma=ma->next) { |
1429 | if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { |
1430 | spin_lock(&ma->mca_lock); |
1431 | if (del_timer(&ma->mca_timer)) |
1432 | atomic_dec(&ma->mca_refcnt); |
1433 | ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); |
1434 | spin_unlock(&ma->mca_lock); |
1435 | break; |
1436 | } |
1437 | } |
1438 | read_unlock_bh(&idev->lock); |
1439 | return 0; |
1440 | } |
1441 | |
1442 | static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, |
1443 | int gdeleted, int sdeleted) |
1444 | { |
1445 | switch (type) { |
1446 | case MLD2_MODE_IS_INCLUDE: |
1447 | case MLD2_MODE_IS_EXCLUDE: |
1448 | if (gdeleted || sdeleted) |
1449 | return false; |
1450 | if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { |
1451 | if (pmc->mca_sfmode == MCAST_INCLUDE) |
1452 | return true; |
1453 | /* don't include if this source is excluded |
1454 | * in all filters |
1455 | */ |
1456 | if (psf->sf_count[MCAST_INCLUDE]) |
1457 | return type == MLD2_MODE_IS_INCLUDE; |
1458 | return pmc->mca_sfcount[MCAST_EXCLUDE] == |
1459 | psf->sf_count[MCAST_EXCLUDE]; |
1460 | } |
1461 | return false; |
1462 | case MLD2_CHANGE_TO_INCLUDE: |
1463 | if (gdeleted || sdeleted) |
1464 | return false; |
1465 | return psf->sf_count[MCAST_INCLUDE] != 0; |
1466 | case MLD2_CHANGE_TO_EXCLUDE: |
1467 | if (gdeleted || sdeleted) |
1468 | return false; |
1469 | if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || |
1470 | psf->sf_count[MCAST_INCLUDE]) |
1471 | return false; |
1472 | return pmc->mca_sfcount[MCAST_EXCLUDE] == |
1473 | psf->sf_count[MCAST_EXCLUDE]; |
1474 | case MLD2_ALLOW_NEW_SOURCES: |
1475 | if (gdeleted || !psf->sf_crcount) |
1476 | return false; |
1477 | return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; |
1478 | case MLD2_BLOCK_OLD_SOURCES: |
1479 | if (pmc->mca_sfmode == MCAST_INCLUDE) |
1480 | return gdeleted || (psf->sf_crcount && sdeleted); |
1481 | return psf->sf_crcount && !gdeleted && !sdeleted; |
1482 | } |
1483 | return false; |
1484 | } |
1485 | |
1486 | static int |
1487 | mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) |
1488 | { |
1489 | struct ip6_sf_list *psf; |
1490 | int scount = 0; |
1491 | |
1492 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
1493 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
1494 | continue; |
1495 | scount++; |
1496 | } |
1497 | return scount; |
1498 | } |
1499 | |
1500 | static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, |
1501 | struct net_device *dev, |
1502 | const struct in6_addr *saddr, |
1503 | const struct in6_addr *daddr, |
1504 | int proto, int len) |
1505 | { |
1506 | struct ipv6hdr *hdr; |
1507 | |
1508 | skb->protocol = htons(ETH_P_IPV6); |
1509 | skb->dev = dev; |
1510 | |
1511 | skb_reset_network_header(skb); |
1512 | skb_put(skb, sizeof(struct ipv6hdr)); |
1513 | hdr = ipv6_hdr(skb); |
1514 | |
1515 | ip6_flow_hdr(hdr, 0, 0); |
1516 | |
1517 | hdr->payload_len = htons(len); |
1518 | hdr->nexthdr = proto; |
1519 | hdr->hop_limit = inet6_sk(sk)->hop_limit; |
1520 | |
1521 | hdr->saddr = *saddr; |
1522 | hdr->daddr = *daddr; |
1523 | } |
1524 | |
1525 | static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size) |
1526 | { |
1527 | struct net_device *dev = idev->dev; |
1528 | struct net *net = dev_net(dev); |
1529 | struct sock *sk = net->ipv6.igmp_sk; |
1530 | struct sk_buff *skb; |
1531 | struct mld2_report *pmr; |
1532 | struct in6_addr addr_buf; |
1533 | const struct in6_addr *saddr; |
1534 | int hlen = LL_RESERVED_SPACE(dev); |
1535 | int tlen = dev->needed_tailroom; |
1536 | int err; |
1537 | u8 ra[8] = { IPPROTO_ICMPV6, 0, |
1538 | IPV6_TLV_ROUTERALERT, 2, 0, 0, |
1539 | IPV6_TLV_PADN, 0 }; |
1540 | |
1541 | /* we assume size > sizeof(ra) here */ |
1542 | size += hlen + tlen; |
1543 | /* limit our allocations to order-0 page */ |
1544 | size = min_t(int, size, SKB_MAX_ORDER(0, 0)); |
1545 | skb = sock_alloc_send_skb(sk, size, 1, &err); |
1546 | |
1547 | if (!skb) |
1548 | return NULL; |
1549 | |
1550 | skb->priority = TC_PRIO_CONTROL; |
1551 | skb_reserve(skb, hlen); |
1552 | |
1553 | if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { |
1554 | /* <draft-ietf-magma-mld-source-05.txt>: |
1555 | * use unspecified address as the source address |
1556 | * when a valid link-local address is not available. |
1557 | */ |
1558 | saddr = &in6addr_any; |
1559 | } else |
1560 | saddr = &addr_buf; |
1561 | |
1562 | ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); |
1563 | |
1564 | memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); |
1565 | |
1566 | skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); |
1567 | skb_put(skb, sizeof(*pmr)); |
1568 | pmr = (struct mld2_report *)skb_transport_header(skb); |
1569 | pmr->mld2r_type = ICMPV6_MLD2_REPORT; |
1570 | pmr->mld2r_resv1 = 0; |
1571 | pmr->mld2r_cksum = 0; |
1572 | pmr->mld2r_resv2 = 0; |
1573 | pmr->mld2r_ngrec = 0; |
1574 | return skb; |
1575 | } |
1576 | |
1577 | static void mld_sendpack(struct sk_buff *skb) |
1578 | { |
1579 | struct ipv6hdr *pip6 = ipv6_hdr(skb); |
1580 | struct mld2_report *pmr = |
1581 | (struct mld2_report *)skb_transport_header(skb); |
1582 | int payload_len, mldlen; |
1583 | struct inet6_dev *idev; |
1584 | struct net *net = dev_net(skb->dev); |
1585 | int err; |
1586 | struct flowi6 fl6; |
1587 | struct dst_entry *dst; |
1588 | |
1589 | rcu_read_lock(); |
1590 | idev = __in6_dev_get(skb->dev); |
1591 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
1592 | |
1593 | payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - |
1594 | sizeof(*pip6); |
1595 | mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1596 | pip6->payload_len = htons(payload_len); |
1597 | |
1598 | pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, |
1599 | IPPROTO_ICMPV6, |
1600 | csum_partial(skb_transport_header(skb), |
1601 | mldlen, 0)); |
1602 | |
1603 | icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, |
1604 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
1605 | skb->dev->ifindex); |
1606 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
1607 | |
1608 | err = 0; |
1609 | if (IS_ERR(dst)) { |
1610 | err = PTR_ERR(dst); |
1611 | dst = NULL; |
1612 | } |
1613 | skb_dst_set(skb, dst); |
1614 | if (err) |
1615 | goto err_out; |
1616 | |
1617 | payload_len = skb->len; |
1618 | |
1619 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, |
1620 | dst_output); |
1621 | out: |
1622 | if (!err) { |
1623 | ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); |
1624 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1625 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len); |
1626 | } else { |
1627 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
1628 | } |
1629 | |
1630 | rcu_read_unlock(); |
1631 | return; |
1632 | |
1633 | err_out: |
1634 | kfree_skb(skb); |
1635 | goto out; |
1636 | } |
1637 | |
1638 | static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) |
1639 | { |
1640 | return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); |
1641 | } |
1642 | |
1643 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
1644 | int type, struct mld2_grec **ppgr) |
1645 | { |
1646 | struct net_device *dev = pmc->idev->dev; |
1647 | struct mld2_report *pmr; |
1648 | struct mld2_grec *pgr; |
1649 | |
1650 | if (!skb) |
1651 | skb = mld_newpack(pmc->idev, dev->mtu); |
1652 | if (!skb) |
1653 | return NULL; |
1654 | pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); |
1655 | pgr->grec_type = type; |
1656 | pgr->grec_auxwords = 0; |
1657 | pgr->grec_nsrcs = 0; |
1658 | pgr->grec_mca = pmc->mca_addr; /* structure copy */ |
1659 | pmr = (struct mld2_report *)skb_transport_header(skb); |
1660 | pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); |
1661 | *ppgr = pgr; |
1662 | return skb; |
1663 | } |
1664 | |
1665 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ |
1666 | skb_tailroom(skb)) : 0) |
1667 | |
1668 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
1669 | int type, int gdeleted, int sdeleted, int crsend) |
1670 | { |
1671 | struct inet6_dev *idev = pmc->idev; |
1672 | struct net_device *dev = idev->dev; |
1673 | struct mld2_report *pmr; |
1674 | struct mld2_grec *pgr = NULL; |
1675 | struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; |
1676 | int scount, stotal, first, isquery, truncate; |
1677 | |
1678 | if (pmc->mca_flags & MAF_NOREPORT) |
1679 | return skb; |
1680 | |
1681 | isquery = type == MLD2_MODE_IS_INCLUDE || |
1682 | type == MLD2_MODE_IS_EXCLUDE; |
1683 | truncate = type == MLD2_MODE_IS_EXCLUDE || |
1684 | type == MLD2_CHANGE_TO_EXCLUDE; |
1685 | |
1686 | stotal = scount = 0; |
1687 | |
1688 | psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; |
1689 | |
1690 | if (!*psf_list) |
1691 | goto empty_source; |
1692 | |
1693 | pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; |
1694 | |
1695 | /* EX and TO_EX get a fresh packet, if needed */ |
1696 | if (truncate) { |
1697 | if (pmr && pmr->mld2r_ngrec && |
1698 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { |
1699 | if (skb) |
1700 | mld_sendpack(skb); |
1701 | skb = mld_newpack(idev, dev->mtu); |
1702 | } |
1703 | } |
1704 | first = 1; |
1705 | psf_prev = NULL; |
1706 | for (psf=*psf_list; psf; psf=psf_next) { |
1707 | struct in6_addr *psrc; |
1708 | |
1709 | psf_next = psf->sf_next; |
1710 | |
1711 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { |
1712 | psf_prev = psf; |
1713 | continue; |
1714 | } |
1715 | |
1716 | /* clear marks on query responses */ |
1717 | if (isquery) |
1718 | psf->sf_gsresp = 0; |
1719 | |
1720 | if (AVAILABLE(skb) < sizeof(*psrc) + |
1721 | first*sizeof(struct mld2_grec)) { |
1722 | if (truncate && !first) |
1723 | break; /* truncate these */ |
1724 | if (pgr) |
1725 | pgr->grec_nsrcs = htons(scount); |
1726 | if (skb) |
1727 | mld_sendpack(skb); |
1728 | skb = mld_newpack(idev, dev->mtu); |
1729 | first = 1; |
1730 | scount = 0; |
1731 | } |
1732 | if (first) { |
1733 | skb = add_grhead(skb, pmc, type, &pgr); |
1734 | first = 0; |
1735 | } |
1736 | if (!skb) |
1737 | return NULL; |
1738 | psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); |
1739 | *psrc = psf->sf_addr; |
1740 | scount++; stotal++; |
1741 | if ((type == MLD2_ALLOW_NEW_SOURCES || |
1742 | type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { |
1743 | psf->sf_crcount--; |
1744 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { |
1745 | if (psf_prev) |
1746 | psf_prev->sf_next = psf->sf_next; |
1747 | else |
1748 | *psf_list = psf->sf_next; |
1749 | kfree(psf); |
1750 | continue; |
1751 | } |
1752 | } |
1753 | psf_prev = psf; |
1754 | } |
1755 | |
1756 | empty_source: |
1757 | if (!stotal) { |
1758 | if (type == MLD2_ALLOW_NEW_SOURCES || |
1759 | type == MLD2_BLOCK_OLD_SOURCES) |
1760 | return skb; |
1761 | if (pmc->mca_crcount || isquery || crsend) { |
1762 | /* make sure we have room for group header */ |
1763 | if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { |
1764 | mld_sendpack(skb); |
1765 | skb = NULL; /* add_grhead will get a new one */ |
1766 | } |
1767 | skb = add_grhead(skb, pmc, type, &pgr); |
1768 | } |
1769 | } |
1770 | if (pgr) |
1771 | pgr->grec_nsrcs = htons(scount); |
1772 | |
1773 | if (isquery) |
1774 | pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ |
1775 | return skb; |
1776 | } |
1777 | |
1778 | static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) |
1779 | { |
1780 | struct sk_buff *skb = NULL; |
1781 | int type; |
1782 | |
1783 | read_lock_bh(&idev->lock); |
1784 | if (!pmc) { |
1785 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
1786 | if (pmc->mca_flags & MAF_NOREPORT) |
1787 | continue; |
1788 | spin_lock_bh(&pmc->mca_lock); |
1789 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
1790 | type = MLD2_MODE_IS_EXCLUDE; |
1791 | else |
1792 | type = MLD2_MODE_IS_INCLUDE; |
1793 | skb = add_grec(skb, pmc, type, 0, 0, 0); |
1794 | spin_unlock_bh(&pmc->mca_lock); |
1795 | } |
1796 | } else { |
1797 | spin_lock_bh(&pmc->mca_lock); |
1798 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
1799 | type = MLD2_MODE_IS_EXCLUDE; |
1800 | else |
1801 | type = MLD2_MODE_IS_INCLUDE; |
1802 | skb = add_grec(skb, pmc, type, 0, 0, 0); |
1803 | spin_unlock_bh(&pmc->mca_lock); |
1804 | } |
1805 | read_unlock_bh(&idev->lock); |
1806 | if (skb) |
1807 | mld_sendpack(skb); |
1808 | } |
1809 | |
1810 | /* |
1811 | * remove zero-count source records from a source filter list |
1812 | */ |
1813 | static void mld_clear_zeros(struct ip6_sf_list **ppsf) |
1814 | { |
1815 | struct ip6_sf_list *psf_prev, *psf_next, *psf; |
1816 | |
1817 | psf_prev = NULL; |
1818 | for (psf=*ppsf; psf; psf = psf_next) { |
1819 | psf_next = psf->sf_next; |
1820 | if (psf->sf_crcount == 0) { |
1821 | if (psf_prev) |
1822 | psf_prev->sf_next = psf->sf_next; |
1823 | else |
1824 | *ppsf = psf->sf_next; |
1825 | kfree(psf); |
1826 | } else |
1827 | psf_prev = psf; |
1828 | } |
1829 | } |
1830 | |
1831 | static void mld_send_cr(struct inet6_dev *idev) |
1832 | { |
1833 | struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; |
1834 | struct sk_buff *skb = NULL; |
1835 | int type, dtype; |
1836 | |
1837 | read_lock_bh(&idev->lock); |
1838 | spin_lock(&idev->mc_lock); |
1839 | |
1840 | /* deleted MCA's */ |
1841 | pmc_prev = NULL; |
1842 | for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { |
1843 | pmc_next = pmc->next; |
1844 | if (pmc->mca_sfmode == MCAST_INCLUDE) { |
1845 | type = MLD2_BLOCK_OLD_SOURCES; |
1846 | dtype = MLD2_BLOCK_OLD_SOURCES; |
1847 | skb = add_grec(skb, pmc, type, 1, 0, 0); |
1848 | skb = add_grec(skb, pmc, dtype, 1, 1, 0); |
1849 | } |
1850 | if (pmc->mca_crcount) { |
1851 | if (pmc->mca_sfmode == MCAST_EXCLUDE) { |
1852 | type = MLD2_CHANGE_TO_INCLUDE; |
1853 | skb = add_grec(skb, pmc, type, 1, 0, 0); |
1854 | } |
1855 | pmc->mca_crcount--; |
1856 | if (pmc->mca_crcount == 0) { |
1857 | mld_clear_zeros(&pmc->mca_tomb); |
1858 | mld_clear_zeros(&pmc->mca_sources); |
1859 | } |
1860 | } |
1861 | if (pmc->mca_crcount == 0 && !pmc->mca_tomb && |
1862 | !pmc->mca_sources) { |
1863 | if (pmc_prev) |
1864 | pmc_prev->next = pmc_next; |
1865 | else |
1866 | idev->mc_tomb = pmc_next; |
1867 | in6_dev_put(pmc->idev); |
1868 | kfree(pmc); |
1869 | } else |
1870 | pmc_prev = pmc; |
1871 | } |
1872 | spin_unlock(&idev->mc_lock); |
1873 | |
1874 | /* change recs */ |
1875 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
1876 | spin_lock_bh(&pmc->mca_lock); |
1877 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
1878 | type = MLD2_BLOCK_OLD_SOURCES; |
1879 | dtype = MLD2_ALLOW_NEW_SOURCES; |
1880 | } else { |
1881 | type = MLD2_ALLOW_NEW_SOURCES; |
1882 | dtype = MLD2_BLOCK_OLD_SOURCES; |
1883 | } |
1884 | skb = add_grec(skb, pmc, type, 0, 0, 0); |
1885 | skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ |
1886 | |
1887 | /* filter mode changes */ |
1888 | if (pmc->mca_crcount) { |
1889 | if (pmc->mca_sfmode == MCAST_EXCLUDE) |
1890 | type = MLD2_CHANGE_TO_EXCLUDE; |
1891 | else |
1892 | type = MLD2_CHANGE_TO_INCLUDE; |
1893 | skb = add_grec(skb, pmc, type, 0, 0, 0); |
1894 | pmc->mca_crcount--; |
1895 | } |
1896 | spin_unlock_bh(&pmc->mca_lock); |
1897 | } |
1898 | read_unlock_bh(&idev->lock); |
1899 | if (!skb) |
1900 | return; |
1901 | (void) mld_sendpack(skb); |
1902 | } |
1903 | |
1904 | static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) |
1905 | { |
1906 | struct net *net = dev_net(dev); |
1907 | struct sock *sk = net->ipv6.igmp_sk; |
1908 | struct inet6_dev *idev; |
1909 | struct sk_buff *skb; |
1910 | struct mld_msg *hdr; |
1911 | const struct in6_addr *snd_addr, *saddr; |
1912 | struct in6_addr addr_buf; |
1913 | int hlen = LL_RESERVED_SPACE(dev); |
1914 | int tlen = dev->needed_tailroom; |
1915 | int err, len, payload_len, full_len; |
1916 | u8 ra[8] = { IPPROTO_ICMPV6, 0, |
1917 | IPV6_TLV_ROUTERALERT, 2, 0, 0, |
1918 | IPV6_TLV_PADN, 0 }; |
1919 | struct flowi6 fl6; |
1920 | struct dst_entry *dst; |
1921 | |
1922 | if (type == ICMPV6_MGM_REDUCTION) |
1923 | snd_addr = &in6addr_linklocal_allrouters; |
1924 | else |
1925 | snd_addr = addr; |
1926 | |
1927 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); |
1928 | payload_len = len + sizeof(ra); |
1929 | full_len = sizeof(struct ipv6hdr) + payload_len; |
1930 | |
1931 | rcu_read_lock(); |
1932 | IP6_UPD_PO_STATS(net, __in6_dev_get(dev), |
1933 | IPSTATS_MIB_OUT, full_len); |
1934 | rcu_read_unlock(); |
1935 | |
1936 | skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); |
1937 | |
1938 | if (skb == NULL) { |
1939 | rcu_read_lock(); |
1940 | IP6_INC_STATS(net, __in6_dev_get(dev), |
1941 | IPSTATS_MIB_OUTDISCARDS); |
1942 | rcu_read_unlock(); |
1943 | return; |
1944 | } |
1945 | skb->priority = TC_PRIO_CONTROL; |
1946 | skb_reserve(skb, hlen); |
1947 | |
1948 | if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { |
1949 | /* <draft-ietf-magma-mld-source-05.txt>: |
1950 | * use unspecified address as the source address |
1951 | * when a valid link-local address is not available. |
1952 | */ |
1953 | saddr = &in6addr_any; |
1954 | } else |
1955 | saddr = &addr_buf; |
1956 | |
1957 | ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); |
1958 | |
1959 | memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); |
1960 | |
1961 | hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg)); |
1962 | memset(hdr, 0, sizeof(struct mld_msg)); |
1963 | hdr->mld_type = type; |
1964 | hdr->mld_mca = *addr; |
1965 | |
1966 | hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, |
1967 | IPPROTO_ICMPV6, |
1968 | csum_partial(hdr, len, 0)); |
1969 | |
1970 | rcu_read_lock(); |
1971 | idev = __in6_dev_get(skb->dev); |
1972 | |
1973 | icmpv6_flow_init(sk, &fl6, type, |
1974 | &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
1975 | skb->dev->ifindex); |
1976 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
1977 | if (IS_ERR(dst)) { |
1978 | err = PTR_ERR(dst); |
1979 | goto err_out; |
1980 | } |
1981 | |
1982 | skb_dst_set(skb, dst); |
1983 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev, |
1984 | dst_output); |
1985 | out: |
1986 | if (!err) { |
1987 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
1988 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1989 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len); |
1990 | } else |
1991 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
1992 | |
1993 | rcu_read_unlock(); |
1994 | return; |
1995 | |
1996 | err_out: |
1997 | kfree_skb(skb); |
1998 | goto out; |
1999 | } |
2000 | |
2001 | static void mld_send_initial_cr(struct inet6_dev *idev) |
2002 | { |
2003 | struct sk_buff *skb; |
2004 | struct ifmcaddr6 *pmc; |
2005 | int type; |
2006 | |
2007 | if (mld_in_v1_mode(idev)) |
2008 | return; |
2009 | |
2010 | skb = NULL; |
2011 | read_lock_bh(&idev->lock); |
2012 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
2013 | spin_lock_bh(&pmc->mca_lock); |
2014 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
2015 | type = MLD2_CHANGE_TO_EXCLUDE; |
2016 | else |
2017 | type = MLD2_CHANGE_TO_INCLUDE; |
2018 | skb = add_grec(skb, pmc, type, 0, 0, 1); |
2019 | spin_unlock_bh(&pmc->mca_lock); |
2020 | } |
2021 | read_unlock_bh(&idev->lock); |
2022 | if (skb) |
2023 | mld_sendpack(skb); |
2024 | } |
2025 | |
2026 | void ipv6_mc_dad_complete(struct inet6_dev *idev) |
2027 | { |
2028 | idev->mc_dad_count = idev->mc_qrv; |
2029 | if (idev->mc_dad_count) { |
2030 | mld_send_initial_cr(idev); |
2031 | idev->mc_dad_count--; |
2032 | if (idev->mc_dad_count) |
2033 | mld_dad_start_timer(idev, idev->mc_maxdelay); |
2034 | } |
2035 | } |
2036 | |
2037 | static void mld_dad_timer_expire(unsigned long data) |
2038 | { |
2039 | struct inet6_dev *idev = (struct inet6_dev *)data; |
2040 | |
2041 | mld_send_initial_cr(idev); |
2042 | if (idev->mc_dad_count) { |
2043 | idev->mc_dad_count--; |
2044 | if (idev->mc_dad_count) |
2045 | mld_dad_start_timer(idev, idev->mc_maxdelay); |
2046 | } |
2047 | in6_dev_put(idev); |
2048 | } |
2049 | |
2050 | static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, |
2051 | const struct in6_addr *psfsrc) |
2052 | { |
2053 | struct ip6_sf_list *psf, *psf_prev; |
2054 | int rv = 0; |
2055 | |
2056 | psf_prev = NULL; |
2057 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
2058 | if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) |
2059 | break; |
2060 | psf_prev = psf; |
2061 | } |
2062 | if (!psf || psf->sf_count[sfmode] == 0) { |
2063 | /* source filter not found, or count wrong => bug */ |
2064 | return -ESRCH; |
2065 | } |
2066 | psf->sf_count[sfmode]--; |
2067 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { |
2068 | struct inet6_dev *idev = pmc->idev; |
2069 | |
2070 | /* no more filters for this source */ |
2071 | if (psf_prev) |
2072 | psf_prev->sf_next = psf->sf_next; |
2073 | else |
2074 | pmc->mca_sources = psf->sf_next; |
2075 | if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && |
2076 | !mld_in_v1_mode(idev)) { |
2077 | psf->sf_crcount = idev->mc_qrv; |
2078 | psf->sf_next = pmc->mca_tomb; |
2079 | pmc->mca_tomb = psf; |
2080 | rv = 1; |
2081 | } else |
2082 | kfree(psf); |
2083 | } |
2084 | return rv; |
2085 | } |
2086 | |
2087 | static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
2088 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
2089 | int delta) |
2090 | { |
2091 | struct ifmcaddr6 *pmc; |
2092 | int changerec = 0; |
2093 | int i, err; |
2094 | |
2095 | if (!idev) |
2096 | return -ENODEV; |
2097 | read_lock_bh(&idev->lock); |
2098 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
2099 | if (ipv6_addr_equal(pmca, &pmc->mca_addr)) |
2100 | break; |
2101 | } |
2102 | if (!pmc) { |
2103 | /* MCA not found?? bug */ |
2104 | read_unlock_bh(&idev->lock); |
2105 | return -ESRCH; |
2106 | } |
2107 | spin_lock_bh(&pmc->mca_lock); |
2108 | sf_markstate(pmc); |
2109 | if (!delta) { |
2110 | if (!pmc->mca_sfcount[sfmode]) { |
2111 | spin_unlock_bh(&pmc->mca_lock); |
2112 | read_unlock_bh(&idev->lock); |
2113 | return -EINVAL; |
2114 | } |
2115 | pmc->mca_sfcount[sfmode]--; |
2116 | } |
2117 | err = 0; |
2118 | for (i=0; i<sfcount; i++) { |
2119 | int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
2120 | |
2121 | changerec |= rv > 0; |
2122 | if (!err && rv < 0) |
2123 | err = rv; |
2124 | } |
2125 | if (pmc->mca_sfmode == MCAST_EXCLUDE && |
2126 | pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && |
2127 | pmc->mca_sfcount[MCAST_INCLUDE]) { |
2128 | struct ip6_sf_list *psf; |
2129 | |
2130 | /* filter mode change */ |
2131 | pmc->mca_sfmode = MCAST_INCLUDE; |
2132 | pmc->mca_crcount = idev->mc_qrv; |
2133 | idev->mc_ifc_count = pmc->mca_crcount; |
2134 | for (psf=pmc->mca_sources; psf; psf = psf->sf_next) |
2135 | psf->sf_crcount = 0; |
2136 | mld_ifc_event(pmc->idev); |
2137 | } else if (sf_setstate(pmc) || changerec) |
2138 | mld_ifc_event(pmc->idev); |
2139 | spin_unlock_bh(&pmc->mca_lock); |
2140 | read_unlock_bh(&idev->lock); |
2141 | return err; |
2142 | } |
2143 | |
2144 | /* |
2145 | * Add multicast single-source filter to the interface list |
2146 | */ |
2147 | static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, |
2148 | const struct in6_addr *psfsrc) |
2149 | { |
2150 | struct ip6_sf_list *psf, *psf_prev; |
2151 | |
2152 | psf_prev = NULL; |
2153 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
2154 | if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) |
2155 | break; |
2156 | psf_prev = psf; |
2157 | } |
2158 | if (!psf) { |
2159 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
2160 | if (!psf) |
2161 | return -ENOBUFS; |
2162 | |
2163 | psf->sf_addr = *psfsrc; |
2164 | if (psf_prev) { |
2165 | psf_prev->sf_next = psf; |
2166 | } else |
2167 | pmc->mca_sources = psf; |
2168 | } |
2169 | psf->sf_count[sfmode]++; |
2170 | return 0; |
2171 | } |
2172 | |
2173 | static void sf_markstate(struct ifmcaddr6 *pmc) |
2174 | { |
2175 | struct ip6_sf_list *psf; |
2176 | int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; |
2177 | |
2178 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) |
2179 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
2180 | psf->sf_oldin = mca_xcount == |
2181 | psf->sf_count[MCAST_EXCLUDE] && |
2182 | !psf->sf_count[MCAST_INCLUDE]; |
2183 | } else |
2184 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; |
2185 | } |
2186 | |
2187 | static int sf_setstate(struct ifmcaddr6 *pmc) |
2188 | { |
2189 | struct ip6_sf_list *psf, *dpsf; |
2190 | int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; |
2191 | int qrv = pmc->idev->mc_qrv; |
2192 | int new_in, rv; |
2193 | |
2194 | rv = 0; |
2195 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
2196 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
2197 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && |
2198 | !psf->sf_count[MCAST_INCLUDE]; |
2199 | } else |
2200 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; |
2201 | if (new_in) { |
2202 | if (!psf->sf_oldin) { |
2203 | struct ip6_sf_list *prev = NULL; |
2204 | |
2205 | for (dpsf=pmc->mca_tomb; dpsf; |
2206 | dpsf=dpsf->sf_next) { |
2207 | if (ipv6_addr_equal(&dpsf->sf_addr, |
2208 | &psf->sf_addr)) |
2209 | break; |
2210 | prev = dpsf; |
2211 | } |
2212 | if (dpsf) { |
2213 | if (prev) |
2214 | prev->sf_next = dpsf->sf_next; |
2215 | else |
2216 | pmc->mca_tomb = dpsf->sf_next; |
2217 | kfree(dpsf); |
2218 | } |
2219 | psf->sf_crcount = qrv; |
2220 | rv++; |
2221 | } |
2222 | } else if (psf->sf_oldin) { |
2223 | psf->sf_crcount = 0; |
2224 | /* |
2225 | * add or update "delete" records if an active filter |
2226 | * is now inactive |
2227 | */ |
2228 | for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) |
2229 | if (ipv6_addr_equal(&dpsf->sf_addr, |
2230 | &psf->sf_addr)) |
2231 | break; |
2232 | if (!dpsf) { |
2233 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
2234 | if (!dpsf) |
2235 | continue; |
2236 | *dpsf = *psf; |
2237 | /* pmc->mca_lock held by callers */ |
2238 | dpsf->sf_next = pmc->mca_tomb; |
2239 | pmc->mca_tomb = dpsf; |
2240 | } |
2241 | dpsf->sf_crcount = qrv; |
2242 | rv++; |
2243 | } |
2244 | } |
2245 | return rv; |
2246 | } |
2247 | |
2248 | /* |
2249 | * Add multicast source filter list to the interface list |
2250 | */ |
2251 | static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
2252 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
2253 | int delta) |
2254 | { |
2255 | struct ifmcaddr6 *pmc; |
2256 | int isexclude; |
2257 | int i, err; |
2258 | |
2259 | if (!idev) |
2260 | return -ENODEV; |
2261 | read_lock_bh(&idev->lock); |
2262 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
2263 | if (ipv6_addr_equal(pmca, &pmc->mca_addr)) |
2264 | break; |
2265 | } |
2266 | if (!pmc) { |
2267 | /* MCA not found?? bug */ |
2268 | read_unlock_bh(&idev->lock); |
2269 | return -ESRCH; |
2270 | } |
2271 | spin_lock_bh(&pmc->mca_lock); |
2272 | |
2273 | sf_markstate(pmc); |
2274 | isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; |
2275 | if (!delta) |
2276 | pmc->mca_sfcount[sfmode]++; |
2277 | err = 0; |
2278 | for (i=0; i<sfcount; i++) { |
2279 | err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
2280 | if (err) |
2281 | break; |
2282 | } |
2283 | if (err) { |
2284 | int j; |
2285 | |
2286 | if (!delta) |
2287 | pmc->mca_sfcount[sfmode]--; |
2288 | for (j=0; j<i; j++) |
2289 | ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
2290 | } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { |
2291 | struct ip6_sf_list *psf; |
2292 | |
2293 | /* filter mode change */ |
2294 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
2295 | pmc->mca_sfmode = MCAST_EXCLUDE; |
2296 | else if (pmc->mca_sfcount[MCAST_INCLUDE]) |
2297 | pmc->mca_sfmode = MCAST_INCLUDE; |
2298 | /* else no filters; keep old mode for reports */ |
2299 | |
2300 | pmc->mca_crcount = idev->mc_qrv; |
2301 | idev->mc_ifc_count = pmc->mca_crcount; |
2302 | for (psf=pmc->mca_sources; psf; psf = psf->sf_next) |
2303 | psf->sf_crcount = 0; |
2304 | mld_ifc_event(idev); |
2305 | } else if (sf_setstate(pmc)) |
2306 | mld_ifc_event(idev); |
2307 | spin_unlock_bh(&pmc->mca_lock); |
2308 | read_unlock_bh(&idev->lock); |
2309 | return err; |
2310 | } |
2311 | |
2312 | static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) |
2313 | { |
2314 | struct ip6_sf_list *psf, *nextpsf; |
2315 | |
2316 | for (psf=pmc->mca_tomb; psf; psf=nextpsf) { |
2317 | nextpsf = psf->sf_next; |
2318 | kfree(psf); |
2319 | } |
2320 | pmc->mca_tomb = NULL; |
2321 | for (psf=pmc->mca_sources; psf; psf=nextpsf) { |
2322 | nextpsf = psf->sf_next; |
2323 | kfree(psf); |
2324 | } |
2325 | pmc->mca_sources = NULL; |
2326 | pmc->mca_sfmode = MCAST_EXCLUDE; |
2327 | pmc->mca_sfcount[MCAST_INCLUDE] = 0; |
2328 | pmc->mca_sfcount[MCAST_EXCLUDE] = 1; |
2329 | } |
2330 | |
2331 | |
2332 | static void igmp6_join_group(struct ifmcaddr6 *ma) |
2333 | { |
2334 | unsigned long delay; |
2335 | |
2336 | if (ma->mca_flags & MAF_NOREPORT) |
2337 | return; |
2338 | |
2339 | igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); |
2340 | |
2341 | delay = prandom_u32() % unsolicited_report_interval(ma->idev); |
2342 | |
2343 | spin_lock_bh(&ma->mca_lock); |
2344 | if (del_timer(&ma->mca_timer)) { |
2345 | atomic_dec(&ma->mca_refcnt); |
2346 | delay = ma->mca_timer.expires - jiffies; |
2347 | } |
2348 | |
2349 | if (!mod_timer(&ma->mca_timer, jiffies + delay)) |
2350 | atomic_inc(&ma->mca_refcnt); |
2351 | ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; |
2352 | spin_unlock_bh(&ma->mca_lock); |
2353 | } |
2354 | |
2355 | static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
2356 | struct inet6_dev *idev) |
2357 | { |
2358 | int err; |
2359 | |
2360 | /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, |
2361 | * so no other readers or writers of iml or its sflist |
2362 | */ |
2363 | if (!iml->sflist) { |
2364 | /* any-source empty exclude case */ |
2365 | return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); |
2366 | } |
2367 | err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, |
2368 | iml->sflist->sl_count, iml->sflist->sl_addr, 0); |
2369 | sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); |
2370 | iml->sflist = NULL; |
2371 | return err; |
2372 | } |
2373 | |
2374 | static void igmp6_leave_group(struct ifmcaddr6 *ma) |
2375 | { |
2376 | if (mld_in_v1_mode(ma->idev)) { |
2377 | if (ma->mca_flags & MAF_LAST_REPORTER) |
2378 | igmp6_send(&ma->mca_addr, ma->idev->dev, |
2379 | ICMPV6_MGM_REDUCTION); |
2380 | } else { |
2381 | mld_add_delrec(ma->idev, ma); |
2382 | mld_ifc_event(ma->idev); |
2383 | } |
2384 | } |
2385 | |
2386 | static void mld_gq_timer_expire(unsigned long data) |
2387 | { |
2388 | struct inet6_dev *idev = (struct inet6_dev *)data; |
2389 | |
2390 | idev->mc_gq_running = 0; |
2391 | mld_send_report(idev, NULL); |
2392 | in6_dev_put(idev); |
2393 | } |
2394 | |
2395 | static void mld_ifc_timer_expire(unsigned long data) |
2396 | { |
2397 | struct inet6_dev *idev = (struct inet6_dev *)data; |
2398 | |
2399 | mld_send_cr(idev); |
2400 | if (idev->mc_ifc_count) { |
2401 | idev->mc_ifc_count--; |
2402 | if (idev->mc_ifc_count) |
2403 | mld_ifc_start_timer(idev, idev->mc_maxdelay); |
2404 | } |
2405 | in6_dev_put(idev); |
2406 | } |
2407 | |
2408 | static void mld_ifc_event(struct inet6_dev *idev) |
2409 | { |
2410 | if (mld_in_v1_mode(idev)) |
2411 | return; |
2412 | idev->mc_ifc_count = idev->mc_qrv; |
2413 | mld_ifc_start_timer(idev, 1); |
2414 | } |
2415 | |
2416 | |
2417 | static void igmp6_timer_handler(unsigned long data) |
2418 | { |
2419 | struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; |
2420 | |
2421 | if (mld_in_v1_mode(ma->idev)) |
2422 | igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); |
2423 | else |
2424 | mld_send_report(ma->idev, ma); |
2425 | |
2426 | spin_lock(&ma->mca_lock); |
2427 | ma->mca_flags |= MAF_LAST_REPORTER; |
2428 | ma->mca_flags &= ~MAF_TIMER_RUNNING; |
2429 | spin_unlock(&ma->mca_lock); |
2430 | ma_put(ma); |
2431 | } |
2432 | |
2433 | /* Device changing type */ |
2434 | |
2435 | void ipv6_mc_unmap(struct inet6_dev *idev) |
2436 | { |
2437 | struct ifmcaddr6 *i; |
2438 | |
2439 | /* Install multicast list, except for all-nodes (already installed) */ |
2440 | |
2441 | read_lock_bh(&idev->lock); |
2442 | for (i = idev->mc_list; i; i = i->next) |
2443 | igmp6_group_dropped(i); |
2444 | read_unlock_bh(&idev->lock); |
2445 | } |
2446 | |
2447 | void ipv6_mc_remap(struct inet6_dev *idev) |
2448 | { |
2449 | ipv6_mc_up(idev); |
2450 | } |
2451 | |
2452 | /* Device going down */ |
2453 | |
2454 | void ipv6_mc_down(struct inet6_dev *idev) |
2455 | { |
2456 | struct ifmcaddr6 *i; |
2457 | |
2458 | /* Withdraw multicast list */ |
2459 | |
2460 | read_lock_bh(&idev->lock); |
2461 | mld_ifc_stop_timer(idev); |
2462 | mld_gq_stop_timer(idev); |
2463 | mld_dad_stop_timer(idev); |
2464 | |
2465 | for (i = idev->mc_list; i; i=i->next) |
2466 | igmp6_group_dropped(i); |
2467 | read_unlock_bh(&idev->lock); |
2468 | |
2469 | mld_clear_delrec(idev); |
2470 | } |
2471 | |
2472 | |
2473 | /* Device going up */ |
2474 | |
2475 | void ipv6_mc_up(struct inet6_dev *idev) |
2476 | { |
2477 | struct ifmcaddr6 *i; |
2478 | |
2479 | /* Install multicast list, except for all-nodes (already installed) */ |
2480 | |
2481 | read_lock_bh(&idev->lock); |
2482 | for (i = idev->mc_list; i; i=i->next) |
2483 | igmp6_group_added(i); |
2484 | read_unlock_bh(&idev->lock); |
2485 | } |
2486 | |
2487 | /* IPv6 device initialization. */ |
2488 | |
2489 | void ipv6_mc_init_dev(struct inet6_dev *idev) |
2490 | { |
2491 | write_lock_bh(&idev->lock); |
2492 | spin_lock_init(&idev->mc_lock); |
2493 | idev->mc_gq_running = 0; |
2494 | setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire, |
2495 | (unsigned long)idev); |
2496 | idev->mc_tomb = NULL; |
2497 | idev->mc_ifc_count = 0; |
2498 | setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire, |
2499 | (unsigned long)idev); |
2500 | setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, |
2501 | (unsigned long)idev); |
2502 | |
2503 | idev->mc_qrv = MLD_QRV_DEFAULT; |
2504 | idev->mc_qi = MLD_QI_DEFAULT; |
2505 | idev->mc_qri = MLD_QRI_DEFAULT; |
2506 | |
2507 | idev->mc_maxdelay = unsolicited_report_interval(idev); |
2508 | idev->mc_v1_seen = 0; |
2509 | write_unlock_bh(&idev->lock); |
2510 | } |
2511 | |
2512 | /* |
2513 | * Device is about to be destroyed: clean up. |
2514 | */ |
2515 | |
2516 | void ipv6_mc_destroy_dev(struct inet6_dev *idev) |
2517 | { |
2518 | struct ifmcaddr6 *i; |
2519 | |
2520 | /* Deactivate timers */ |
2521 | ipv6_mc_down(idev); |
2522 | |
2523 | /* Delete all-nodes address. */ |
2524 | /* We cannot call ipv6_dev_mc_dec() directly, our caller in |
2525 | * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will |
2526 | * fail. |
2527 | */ |
2528 | __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); |
2529 | |
2530 | if (idev->cnf.forwarding) |
2531 | __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); |
2532 | |
2533 | write_lock_bh(&idev->lock); |
2534 | while ((i = idev->mc_list) != NULL) { |
2535 | idev->mc_list = i->next; |
2536 | write_unlock_bh(&idev->lock); |
2537 | |
2538 | igmp6_group_dropped(i); |
2539 | ma_put(i); |
2540 | |
2541 | write_lock_bh(&idev->lock); |
2542 | } |
2543 | write_unlock_bh(&idev->lock); |
2544 | } |
2545 | |
2546 | #ifdef CONFIG_PROC_FS |
2547 | struct igmp6_mc_iter_state { |
2548 | struct seq_net_private p; |
2549 | struct net_device *dev; |
2550 | struct inet6_dev *idev; |
2551 | }; |
2552 | |
2553 | #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) |
2554 | |
2555 | static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) |
2556 | { |
2557 | struct ifmcaddr6 *im = NULL; |
2558 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2559 | struct net *net = seq_file_net(seq); |
2560 | |
2561 | state->idev = NULL; |
2562 | for_each_netdev_rcu(net, state->dev) { |
2563 | struct inet6_dev *idev; |
2564 | idev = __in6_dev_get(state->dev); |
2565 | if (!idev) |
2566 | continue; |
2567 | read_lock_bh(&idev->lock); |
2568 | im = idev->mc_list; |
2569 | if (im) { |
2570 | state->idev = idev; |
2571 | break; |
2572 | } |
2573 | read_unlock_bh(&idev->lock); |
2574 | } |
2575 | return im; |
2576 | } |
2577 | |
2578 | static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) |
2579 | { |
2580 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2581 | |
2582 | im = im->next; |
2583 | while (!im) { |
2584 | if (likely(state->idev != NULL)) |
2585 | read_unlock_bh(&state->idev->lock); |
2586 | |
2587 | state->dev = next_net_device_rcu(state->dev); |
2588 | if (!state->dev) { |
2589 | state->idev = NULL; |
2590 | break; |
2591 | } |
2592 | state->idev = __in6_dev_get(state->dev); |
2593 | if (!state->idev) |
2594 | continue; |
2595 | read_lock_bh(&state->idev->lock); |
2596 | im = state->idev->mc_list; |
2597 | } |
2598 | return im; |
2599 | } |
2600 | |
2601 | static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) |
2602 | { |
2603 | struct ifmcaddr6 *im = igmp6_mc_get_first(seq); |
2604 | if (im) |
2605 | while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) |
2606 | --pos; |
2607 | return pos ? NULL : im; |
2608 | } |
2609 | |
2610 | static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) |
2611 | __acquires(RCU) |
2612 | { |
2613 | rcu_read_lock(); |
2614 | return igmp6_mc_get_idx(seq, *pos); |
2615 | } |
2616 | |
2617 | static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
2618 | { |
2619 | struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); |
2620 | |
2621 | ++*pos; |
2622 | return im; |
2623 | } |
2624 | |
2625 | static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) |
2626 | __releases(RCU) |
2627 | { |
2628 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2629 | |
2630 | if (likely(state->idev != NULL)) { |
2631 | read_unlock_bh(&state->idev->lock); |
2632 | state->idev = NULL; |
2633 | } |
2634 | state->dev = NULL; |
2635 | rcu_read_unlock(); |
2636 | } |
2637 | |
2638 | static int igmp6_mc_seq_show(struct seq_file *seq, void *v) |
2639 | { |
2640 | struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; |
2641 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2642 | |
2643 | seq_printf(seq, |
2644 | "%-4d %-15s %pi6 %5d %08X %ld\n", |
2645 | state->dev->ifindex, state->dev->name, |
2646 | &im->mca_addr, |
2647 | im->mca_users, im->mca_flags, |
2648 | (im->mca_flags&MAF_TIMER_RUNNING) ? |
2649 | jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); |
2650 | return 0; |
2651 | } |
2652 | |
2653 | static const struct seq_operations igmp6_mc_seq_ops = { |
2654 | .start = igmp6_mc_seq_start, |
2655 | .next = igmp6_mc_seq_next, |
2656 | .stop = igmp6_mc_seq_stop, |
2657 | .show = igmp6_mc_seq_show, |
2658 | }; |
2659 | |
2660 | static int igmp6_mc_seq_open(struct inode *inode, struct file *file) |
2661 | { |
2662 | return seq_open_net(inode, file, &igmp6_mc_seq_ops, |
2663 | sizeof(struct igmp6_mc_iter_state)); |
2664 | } |
2665 | |
2666 | static const struct file_operations igmp6_mc_seq_fops = { |
2667 | .owner = THIS_MODULE, |
2668 | .open = igmp6_mc_seq_open, |
2669 | .read = seq_read, |
2670 | .llseek = seq_lseek, |
2671 | .release = seq_release_net, |
2672 | }; |
2673 | |
2674 | struct igmp6_mcf_iter_state { |
2675 | struct seq_net_private p; |
2676 | struct net_device *dev; |
2677 | struct inet6_dev *idev; |
2678 | struct ifmcaddr6 *im; |
2679 | }; |
2680 | |
2681 | #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) |
2682 | |
2683 | static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) |
2684 | { |
2685 | struct ip6_sf_list *psf = NULL; |
2686 | struct ifmcaddr6 *im = NULL; |
2687 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
2688 | struct net *net = seq_file_net(seq); |
2689 | |
2690 | state->idev = NULL; |
2691 | state->im = NULL; |
2692 | for_each_netdev_rcu(net, state->dev) { |
2693 | struct inet6_dev *idev; |
2694 | idev = __in6_dev_get(state->dev); |
2695 | if (unlikely(idev == NULL)) |
2696 | continue; |
2697 | read_lock_bh(&idev->lock); |
2698 | im = idev->mc_list; |
2699 | if (likely(im != NULL)) { |
2700 | spin_lock_bh(&im->mca_lock); |
2701 | psf = im->mca_sources; |
2702 | if (likely(psf != NULL)) { |
2703 | state->im = im; |
2704 | state->idev = idev; |
2705 | break; |
2706 | } |
2707 | spin_unlock_bh(&im->mca_lock); |
2708 | } |
2709 | read_unlock_bh(&idev->lock); |
2710 | } |
2711 | return psf; |
2712 | } |
2713 | |
2714 | static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) |
2715 | { |
2716 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
2717 | |
2718 | psf = psf->sf_next; |
2719 | while (!psf) { |
2720 | spin_unlock_bh(&state->im->mca_lock); |
2721 | state->im = state->im->next; |
2722 | while (!state->im) { |
2723 | if (likely(state->idev != NULL)) |
2724 | read_unlock_bh(&state->idev->lock); |
2725 | |
2726 | state->dev = next_net_device_rcu(state->dev); |
2727 | if (!state->dev) { |
2728 | state->idev = NULL; |
2729 | goto out; |
2730 | } |
2731 | state->idev = __in6_dev_get(state->dev); |
2732 | if (!state->idev) |
2733 | continue; |
2734 | read_lock_bh(&state->idev->lock); |
2735 | state->im = state->idev->mc_list; |
2736 | } |
2737 | if (!state->im) |
2738 | break; |
2739 | spin_lock_bh(&state->im->mca_lock); |
2740 | psf = state->im->mca_sources; |
2741 | } |
2742 | out: |
2743 | return psf; |
2744 | } |
2745 | |
2746 | static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) |
2747 | { |
2748 | struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); |
2749 | if (psf) |
2750 | while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) |
2751 | --pos; |
2752 | return pos ? NULL : psf; |
2753 | } |
2754 | |
2755 | static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) |
2756 | __acquires(RCU) |
2757 | { |
2758 | rcu_read_lock(); |
2759 | return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2760 | } |
2761 | |
2762 | static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
2763 | { |
2764 | struct ip6_sf_list *psf; |
2765 | if (v == SEQ_START_TOKEN) |
2766 | psf = igmp6_mcf_get_first(seq); |
2767 | else |
2768 | psf = igmp6_mcf_get_next(seq, v); |
2769 | ++*pos; |
2770 | return psf; |
2771 | } |
2772 | |
2773 | static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) |
2774 | __releases(RCU) |
2775 | { |
2776 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
2777 | if (likely(state->im != NULL)) { |
2778 | spin_unlock_bh(&state->im->mca_lock); |
2779 | state->im = NULL; |
2780 | } |
2781 | if (likely(state->idev != NULL)) { |
2782 | read_unlock_bh(&state->idev->lock); |
2783 | state->idev = NULL; |
2784 | } |
2785 | state->dev = NULL; |
2786 | rcu_read_unlock(); |
2787 | } |
2788 | |
2789 | static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) |
2790 | { |
2791 | struct ip6_sf_list *psf = (struct ip6_sf_list *)v; |
2792 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
2793 | |
2794 | if (v == SEQ_START_TOKEN) { |
2795 | seq_printf(seq, |
2796 | "%3s %6s " |
2797 | "%32s %32s %6s %6s\n", "Idx", |
2798 | "Device", "Multicast Address", |
2799 | "Source Address", "INC", "EXC"); |
2800 | } else { |
2801 | seq_printf(seq, |
2802 | "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", |
2803 | state->dev->ifindex, state->dev->name, |
2804 | &state->im->mca_addr, |
2805 | &psf->sf_addr, |
2806 | psf->sf_count[MCAST_INCLUDE], |
2807 | psf->sf_count[MCAST_EXCLUDE]); |
2808 | } |
2809 | return 0; |
2810 | } |
2811 | |
2812 | static const struct seq_operations igmp6_mcf_seq_ops = { |
2813 | .start = igmp6_mcf_seq_start, |
2814 | .next = igmp6_mcf_seq_next, |
2815 | .stop = igmp6_mcf_seq_stop, |
2816 | .show = igmp6_mcf_seq_show, |
2817 | }; |
2818 | |
2819 | static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) |
2820 | { |
2821 | return seq_open_net(inode, file, &igmp6_mcf_seq_ops, |
2822 | sizeof(struct igmp6_mcf_iter_state)); |
2823 | } |
2824 | |
2825 | static const struct file_operations igmp6_mcf_seq_fops = { |
2826 | .owner = THIS_MODULE, |
2827 | .open = igmp6_mcf_seq_open, |
2828 | .read = seq_read, |
2829 | .llseek = seq_lseek, |
2830 | .release = seq_release_net, |
2831 | }; |
2832 | |
2833 | static int __net_init igmp6_proc_init(struct net *net) |
2834 | { |
2835 | int err; |
2836 | |
2837 | err = -ENOMEM; |
2838 | if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops)) |
2839 | goto out; |
2840 | if (!proc_create("mcfilter6", S_IRUGO, net->proc_net, |
2841 | &igmp6_mcf_seq_fops)) |
2842 | goto out_proc_net_igmp6; |
2843 | |
2844 | err = 0; |
2845 | out: |
2846 | return err; |
2847 | |
2848 | out_proc_net_igmp6: |
2849 | remove_proc_entry("igmp6", net->proc_net); |
2850 | goto out; |
2851 | } |
2852 | |
2853 | static void __net_exit igmp6_proc_exit(struct net *net) |
2854 | { |
2855 | remove_proc_entry("mcfilter6", net->proc_net); |
2856 | remove_proc_entry("igmp6", net->proc_net); |
2857 | } |
2858 | #else |
2859 | static inline int igmp6_proc_init(struct net *net) |
2860 | { |
2861 | return 0; |
2862 | } |
2863 | static inline void igmp6_proc_exit(struct net *net) |
2864 | { |
2865 | } |
2866 | #endif |
2867 | |
2868 | static int __net_init igmp6_net_init(struct net *net) |
2869 | { |
2870 | int err; |
2871 | |
2872 | err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, |
2873 | SOCK_RAW, IPPROTO_ICMPV6, net); |
2874 | if (err < 0) { |
2875 | pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", |
2876 | err); |
2877 | goto out; |
2878 | } |
2879 | |
2880 | inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; |
2881 | |
2882 | err = igmp6_proc_init(net); |
2883 | if (err) |
2884 | goto out_sock_create; |
2885 | out: |
2886 | return err; |
2887 | |
2888 | out_sock_create: |
2889 | inet_ctl_sock_destroy(net->ipv6.igmp_sk); |
2890 | goto out; |
2891 | } |
2892 | |
2893 | static void __net_exit igmp6_net_exit(struct net *net) |
2894 | { |
2895 | inet_ctl_sock_destroy(net->ipv6.igmp_sk); |
2896 | igmp6_proc_exit(net); |
2897 | } |
2898 | |
2899 | static struct pernet_operations igmp6_net_ops = { |
2900 | .init = igmp6_net_init, |
2901 | .exit = igmp6_net_exit, |
2902 | }; |
2903 | |
2904 | int __init igmp6_init(void) |
2905 | { |
2906 | return register_pernet_subsys(&igmp6_net_ops); |
2907 | } |
2908 | |
2909 | void igmp6_cleanup(void) |
2910 | { |
2911 | unregister_pernet_subsys(&igmp6_net_ops); |
2912 | } |
2913 |
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v2.6.34-rc5
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