1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Multicast support for IPv6 |
4 | * Linux INET6 implementation |
5 | * |
6 | * Authors: |
7 | * Pedro Roque <roque@di.fc.ul.pt> |
8 | * |
9 | * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c |
10 | */ |
11 | |
12 | /* Changes: |
13 | * |
14 | * yoshfuji : fix format of router-alert option |
15 | * YOSHIFUJI Hideaki @USAGI: |
16 | * Fixed source address for MLD message based on |
17 | * <draft-ietf-magma-mld-source-05.txt>. |
18 | * YOSHIFUJI Hideaki @USAGI: |
19 | * - Ignore Queries for invalid addresses. |
20 | * - MLD for link-local addresses. |
21 | * David L Stevens <dlstevens@us.ibm.com>: |
22 | * - MLDv2 support |
23 | */ |
24 | |
25 | #include <linux/module.h> |
26 | #include <linux/errno.h> |
27 | #include <linux/types.h> |
28 | #include <linux/string.h> |
29 | #include <linux/socket.h> |
30 | #include <linux/sockios.h> |
31 | #include <linux/jiffies.h> |
32 | #include <linux/net.h> |
33 | #include <linux/in.h> |
34 | #include <linux/in6.h> |
35 | #include <linux/netdevice.h> |
36 | #include <linux/if_arp.h> |
37 | #include <linux/route.h> |
38 | #include <linux/init.h> |
39 | #include <linux/proc_fs.h> |
40 | #include <linux/seq_file.h> |
41 | #include <linux/slab.h> |
42 | #include <linux/pkt_sched.h> |
43 | #include <net/mld.h> |
44 | #include <linux/workqueue.h> |
45 | |
46 | #include <linux/netfilter.h> |
47 | #include <linux/netfilter_ipv6.h> |
48 | |
49 | #include <net/net_namespace.h> |
50 | #include <net/sock.h> |
51 | #include <net/snmp.h> |
52 | |
53 | #include <net/ipv6.h> |
54 | #include <net/protocol.h> |
55 | #include <net/if_inet6.h> |
56 | #include <net/ndisc.h> |
57 | #include <net/addrconf.h> |
58 | #include <net/ip6_route.h> |
59 | #include <net/inet_common.h> |
60 | |
61 | #include <net/ip6_checksum.h> |
62 | |
63 | /* Ensure that we have struct in6_addr aligned on 32bit word. */ |
64 | static int __mld2_query_bugs[] __attribute__((__unused__)) = { |
65 | BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), |
66 | BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), |
67 | BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) |
68 | }; |
69 | |
70 | static struct workqueue_struct *mld_wq; |
71 | static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; |
72 | |
73 | static void igmp6_join_group(struct ifmcaddr6 *ma); |
74 | static void igmp6_leave_group(struct ifmcaddr6 *ma); |
75 | static void mld_mca_work(struct work_struct *work); |
76 | |
77 | static void mld_ifc_event(struct inet6_dev *idev); |
78 | static bool mld_in_v1_mode(const struct inet6_dev *idev); |
79 | static int sf_setstate(struct ifmcaddr6 *pmc); |
80 | static void sf_markstate(struct ifmcaddr6 *pmc); |
81 | static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); |
82 | static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
83 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
84 | int delta); |
85 | static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
86 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
87 | int delta); |
88 | static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
89 | struct inet6_dev *idev); |
90 | static int __ipv6_dev_mc_inc(struct net_device *dev, |
91 | const struct in6_addr *addr, unsigned int mode); |
92 | |
93 | #define MLD_QRV_DEFAULT 2 |
94 | /* RFC3810, 9.2. Query Interval */ |
95 | #define MLD_QI_DEFAULT (125 * HZ) |
96 | /* RFC3810, 9.3. Query Response Interval */ |
97 | #define MLD_QRI_DEFAULT (10 * HZ) |
98 | |
99 | /* RFC3810, 8.1 Query Version Distinctions */ |
100 | #define MLD_V1_QUERY_LEN 24 |
101 | #define MLD_V2_QUERY_LEN_MIN 28 |
102 | |
103 | #define IPV6_MLD_MAX_MSF 64 |
104 | |
105 | int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; |
106 | int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; |
107 | |
108 | /* |
109 | * socket join on multicast group |
110 | */ |
111 | #define mc_dereference(e, idev) \ |
112 | rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock)) |
113 | |
114 | #define sock_dereference(e, sk) \ |
115 | rcu_dereference_protected(e, lockdep_sock_is_held(sk)) |
116 | |
117 | #define for_each_pmc_socklock(np, sk, pmc) \ |
118 | for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \ |
119 | pmc; \ |
120 | pmc = sock_dereference(pmc->next, sk)) |
121 | |
122 | #define for_each_pmc_rcu(np, pmc) \ |
123 | for (pmc = rcu_dereference((np)->ipv6_mc_list); \ |
124 | pmc; \ |
125 | pmc = rcu_dereference(pmc->next)) |
126 | |
127 | #define for_each_psf_mclock(mc, psf) \ |
128 | for (psf = mc_dereference((mc)->mca_sources, mc->idev); \ |
129 | psf; \ |
130 | psf = mc_dereference(psf->sf_next, mc->idev)) |
131 | |
132 | #define for_each_psf_rcu(mc, psf) \ |
133 | for (psf = rcu_dereference((mc)->mca_sources); \ |
134 | psf; \ |
135 | psf = rcu_dereference(psf->sf_next)) |
136 | |
137 | #define for_each_psf_tomb(mc, psf) \ |
138 | for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \ |
139 | psf; \ |
140 | psf = mc_dereference(psf->sf_next, mc->idev)) |
141 | |
142 | #define for_each_mc_mclock(idev, mc) \ |
143 | for (mc = mc_dereference((idev)->mc_list, idev); \ |
144 | mc; \ |
145 | mc = mc_dereference(mc->next, idev)) |
146 | |
147 | #define for_each_mc_rcu(idev, mc) \ |
148 | for (mc = rcu_dereference((idev)->mc_list); \ |
149 | mc; \ |
150 | mc = rcu_dereference(mc->next)) |
151 | |
152 | #define for_each_mc_tomb(idev, mc) \ |
153 | for (mc = mc_dereference((idev)->mc_tomb, idev); \ |
154 | mc; \ |
155 | mc = mc_dereference(mc->next, idev)) |
156 | |
157 | static int unsolicited_report_interval(struct inet6_dev *idev) |
158 | { |
159 | int iv; |
160 | |
161 | if (mld_in_v1_mode(idev)) |
162 | iv = idev->cnf.mldv1_unsolicited_report_interval; |
163 | else |
164 | iv = idev->cnf.mldv2_unsolicited_report_interval; |
165 | |
166 | return iv > 0 ? iv : 1; |
167 | } |
168 | |
169 | static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, |
170 | const struct in6_addr *addr, unsigned int mode) |
171 | { |
172 | struct net_device *dev = NULL; |
173 | struct ipv6_mc_socklist *mc_lst; |
174 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
175 | struct net *net = sock_net(sk); |
176 | int err; |
177 | |
178 | ASSERT_RTNL(); |
179 | |
180 | if (!ipv6_addr_is_multicast(addr)) |
181 | return -EINVAL; |
182 | |
183 | for_each_pmc_socklock(np, sk, mc_lst) { |
184 | if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
185 | ipv6_addr_equal(a1: &mc_lst->addr, a2: addr)) |
186 | return -EADDRINUSE; |
187 | } |
188 | |
189 | mc_lst = sock_kmalloc(sk, size: sizeof(struct ipv6_mc_socklist), GFP_KERNEL); |
190 | |
191 | if (!mc_lst) |
192 | return -ENOMEM; |
193 | |
194 | mc_lst->next = NULL; |
195 | mc_lst->addr = *addr; |
196 | |
197 | if (ifindex == 0) { |
198 | struct rt6_info *rt; |
199 | rt = rt6_lookup(net, daddr: addr, NULL, oif: 0, NULL, flags: 0); |
200 | if (rt) { |
201 | dev = rt->dst.dev; |
202 | ip6_rt_put(rt); |
203 | } |
204 | } else |
205 | dev = __dev_get_by_index(net, ifindex); |
206 | |
207 | if (!dev) { |
208 | sock_kfree_s(sk, mem: mc_lst, size: sizeof(*mc_lst)); |
209 | return -ENODEV; |
210 | } |
211 | |
212 | mc_lst->ifindex = dev->ifindex; |
213 | mc_lst->sfmode = mode; |
214 | RCU_INIT_POINTER(mc_lst->sflist, NULL); |
215 | |
216 | /* |
217 | * now add/increase the group membership on the device |
218 | */ |
219 | |
220 | err = __ipv6_dev_mc_inc(dev, addr, mode); |
221 | |
222 | if (err) { |
223 | sock_kfree_s(sk, mem: mc_lst, size: sizeof(*mc_lst)); |
224 | return err; |
225 | } |
226 | |
227 | mc_lst->next = np->ipv6_mc_list; |
228 | rcu_assign_pointer(np->ipv6_mc_list, mc_lst); |
229 | |
230 | return 0; |
231 | } |
232 | |
233 | int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
234 | { |
235 | return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); |
236 | } |
237 | EXPORT_SYMBOL(ipv6_sock_mc_join); |
238 | |
239 | int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, |
240 | const struct in6_addr *addr, unsigned int mode) |
241 | { |
242 | return __ipv6_sock_mc_join(sk, ifindex, addr, mode); |
243 | } |
244 | |
245 | /* |
246 | * socket leave on multicast group |
247 | */ |
248 | int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
249 | { |
250 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
251 | struct ipv6_mc_socklist *mc_lst; |
252 | struct ipv6_mc_socklist __rcu **lnk; |
253 | struct net *net = sock_net(sk); |
254 | |
255 | ASSERT_RTNL(); |
256 | |
257 | if (!ipv6_addr_is_multicast(addr)) |
258 | return -EINVAL; |
259 | |
260 | for (lnk = &np->ipv6_mc_list; |
261 | (mc_lst = sock_dereference(*lnk, sk)) != NULL; |
262 | lnk = &mc_lst->next) { |
263 | if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
264 | ipv6_addr_equal(a1: &mc_lst->addr, a2: addr)) { |
265 | struct net_device *dev; |
266 | |
267 | *lnk = mc_lst->next; |
268 | |
269 | dev = __dev_get_by_index(net, ifindex: mc_lst->ifindex); |
270 | if (dev) { |
271 | struct inet6_dev *idev = __in6_dev_get(dev); |
272 | |
273 | ip6_mc_leave_src(sk, iml: mc_lst, idev); |
274 | if (idev) |
275 | __ipv6_dev_mc_dec(idev, addr: &mc_lst->addr); |
276 | } else { |
277 | ip6_mc_leave_src(sk, iml: mc_lst, NULL); |
278 | } |
279 | |
280 | atomic_sub(i: sizeof(*mc_lst), v: &sk->sk_omem_alloc); |
281 | kfree_rcu(mc_lst, rcu); |
282 | return 0; |
283 | } |
284 | } |
285 | |
286 | return -EADDRNOTAVAIL; |
287 | } |
288 | EXPORT_SYMBOL(ipv6_sock_mc_drop); |
289 | |
290 | static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net, |
291 | const struct in6_addr *group, |
292 | int ifindex) |
293 | { |
294 | struct net_device *dev = NULL; |
295 | struct inet6_dev *idev = NULL; |
296 | |
297 | if (ifindex == 0) { |
298 | struct rt6_info *rt = rt6_lookup(net, daddr: group, NULL, oif: 0, NULL, flags: 0); |
299 | |
300 | if (rt) { |
301 | dev = rt->dst.dev; |
302 | ip6_rt_put(rt); |
303 | } |
304 | } else { |
305 | dev = __dev_get_by_index(net, ifindex); |
306 | } |
307 | |
308 | if (!dev) |
309 | return NULL; |
310 | idev = __in6_dev_get(dev); |
311 | if (!idev) |
312 | return NULL; |
313 | if (idev->dead) |
314 | return NULL; |
315 | return idev; |
316 | } |
317 | |
318 | void __ipv6_sock_mc_close(struct sock *sk) |
319 | { |
320 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
321 | struct ipv6_mc_socklist *mc_lst; |
322 | struct net *net = sock_net(sk); |
323 | |
324 | ASSERT_RTNL(); |
325 | |
326 | while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) { |
327 | struct net_device *dev; |
328 | |
329 | np->ipv6_mc_list = mc_lst->next; |
330 | |
331 | dev = __dev_get_by_index(net, ifindex: mc_lst->ifindex); |
332 | if (dev) { |
333 | struct inet6_dev *idev = __in6_dev_get(dev); |
334 | |
335 | ip6_mc_leave_src(sk, iml: mc_lst, idev); |
336 | if (idev) |
337 | __ipv6_dev_mc_dec(idev, addr: &mc_lst->addr); |
338 | } else { |
339 | ip6_mc_leave_src(sk, iml: mc_lst, NULL); |
340 | } |
341 | |
342 | atomic_sub(i: sizeof(*mc_lst), v: &sk->sk_omem_alloc); |
343 | kfree_rcu(mc_lst, rcu); |
344 | } |
345 | } |
346 | |
347 | void ipv6_sock_mc_close(struct sock *sk) |
348 | { |
349 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
350 | |
351 | if (!rcu_access_pointer(np->ipv6_mc_list)) |
352 | return; |
353 | |
354 | rtnl_lock(); |
355 | lock_sock(sk); |
356 | __ipv6_sock_mc_close(sk); |
357 | release_sock(sk); |
358 | rtnl_unlock(); |
359 | } |
360 | |
361 | int ip6_mc_source(int add, int omode, struct sock *sk, |
362 | struct group_source_req *pgsr) |
363 | { |
364 | struct in6_addr *source, *group; |
365 | struct ipv6_mc_socklist *pmc; |
366 | struct inet6_dev *idev; |
367 | struct ipv6_pinfo *inet6 = inet6_sk(sk: sk); |
368 | struct ip6_sf_socklist *psl; |
369 | struct net *net = sock_net(sk); |
370 | int i, j, rv; |
371 | int leavegroup = 0; |
372 | int err; |
373 | |
374 | source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; |
375 | group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; |
376 | |
377 | if (!ipv6_addr_is_multicast(addr: group)) |
378 | return -EINVAL; |
379 | |
380 | idev = ip6_mc_find_dev_rtnl(net, group, ifindex: pgsr->gsr_interface); |
381 | if (!idev) |
382 | return -ENODEV; |
383 | |
384 | err = -EADDRNOTAVAIL; |
385 | |
386 | mutex_lock(&idev->mc_lock); |
387 | for_each_pmc_socklock(inet6, sk, pmc) { |
388 | if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) |
389 | continue; |
390 | if (ipv6_addr_equal(a1: &pmc->addr, a2: group)) |
391 | break; |
392 | } |
393 | if (!pmc) { /* must have a prior join */ |
394 | err = -EINVAL; |
395 | goto done; |
396 | } |
397 | /* if a source filter was set, must be the same mode as before */ |
398 | if (rcu_access_pointer(pmc->sflist)) { |
399 | if (pmc->sfmode != omode) { |
400 | err = -EINVAL; |
401 | goto done; |
402 | } |
403 | } else if (pmc->sfmode != omode) { |
404 | /* allow mode switches for empty-set filters */ |
405 | ip6_mc_add_src(idev, pmca: group, sfmode: omode, sfcount: 0, NULL, delta: 0); |
406 | ip6_mc_del_src(idev, pmca: group, sfmode: pmc->sfmode, sfcount: 0, NULL, delta: 0); |
407 | pmc->sfmode = omode; |
408 | } |
409 | |
410 | psl = sock_dereference(pmc->sflist, sk); |
411 | if (!add) { |
412 | if (!psl) |
413 | goto done; /* err = -EADDRNOTAVAIL */ |
414 | rv = !0; |
415 | for (i = 0; i < psl->sl_count; i++) { |
416 | rv = !ipv6_addr_equal(a1: &psl->sl_addr[i], a2: source); |
417 | if (rv == 0) |
418 | break; |
419 | } |
420 | if (rv) /* source not found */ |
421 | goto done; /* err = -EADDRNOTAVAIL */ |
422 | |
423 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
424 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { |
425 | leavegroup = 1; |
426 | goto done; |
427 | } |
428 | |
429 | /* update the interface filter */ |
430 | ip6_mc_del_src(idev, pmca: group, sfmode: omode, sfcount: 1, psfsrc: source, delta: 1); |
431 | |
432 | for (j = i+1; j < psl->sl_count; j++) |
433 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
434 | psl->sl_count--; |
435 | err = 0; |
436 | goto done; |
437 | } |
438 | /* else, add a new source to the filter */ |
439 | |
440 | if (psl && psl->sl_count >= sysctl_mld_max_msf) { |
441 | err = -ENOBUFS; |
442 | goto done; |
443 | } |
444 | if (!psl || psl->sl_count == psl->sl_max) { |
445 | struct ip6_sf_socklist *newpsl; |
446 | int count = IP6_SFBLOCK; |
447 | |
448 | if (psl) |
449 | count += psl->sl_max; |
450 | newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), |
451 | GFP_KERNEL); |
452 | if (!newpsl) { |
453 | err = -ENOBUFS; |
454 | goto done; |
455 | } |
456 | newpsl->sl_max = count; |
457 | newpsl->sl_count = count - IP6_SFBLOCK; |
458 | if (psl) { |
459 | for (i = 0; i < psl->sl_count; i++) |
460 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
461 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
462 | v: &sk->sk_omem_alloc); |
463 | } |
464 | rcu_assign_pointer(pmc->sflist, newpsl); |
465 | kfree_rcu(psl, rcu); |
466 | psl = newpsl; |
467 | } |
468 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ |
469 | for (i = 0; i < psl->sl_count; i++) { |
470 | rv = !ipv6_addr_equal(a1: &psl->sl_addr[i], a2: source); |
471 | if (rv == 0) /* There is an error in the address. */ |
472 | goto done; |
473 | } |
474 | for (j = psl->sl_count-1; j >= i; j--) |
475 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
476 | psl->sl_addr[i] = *source; |
477 | psl->sl_count++; |
478 | err = 0; |
479 | /* update the interface list */ |
480 | ip6_mc_add_src(idev, pmca: group, sfmode: omode, sfcount: 1, psfsrc: source, delta: 1); |
481 | done: |
482 | mutex_unlock(lock: &idev->mc_lock); |
483 | if (leavegroup) |
484 | err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); |
485 | return err; |
486 | } |
487 | |
488 | int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, |
489 | struct sockaddr_storage *list) |
490 | { |
491 | const struct in6_addr *group; |
492 | struct ipv6_mc_socklist *pmc; |
493 | struct inet6_dev *idev; |
494 | struct ipv6_pinfo *inet6 = inet6_sk(sk: sk); |
495 | struct ip6_sf_socklist *newpsl, *psl; |
496 | struct net *net = sock_net(sk); |
497 | int leavegroup = 0; |
498 | int i, err; |
499 | |
500 | group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
501 | |
502 | if (!ipv6_addr_is_multicast(addr: group)) |
503 | return -EINVAL; |
504 | if (gsf->gf_fmode != MCAST_INCLUDE && |
505 | gsf->gf_fmode != MCAST_EXCLUDE) |
506 | return -EINVAL; |
507 | |
508 | idev = ip6_mc_find_dev_rtnl(net, group, ifindex: gsf->gf_interface); |
509 | if (!idev) |
510 | return -ENODEV; |
511 | |
512 | err = 0; |
513 | |
514 | if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { |
515 | leavegroup = 1; |
516 | goto done; |
517 | } |
518 | |
519 | for_each_pmc_socklock(inet6, sk, pmc) { |
520 | if (pmc->ifindex != gsf->gf_interface) |
521 | continue; |
522 | if (ipv6_addr_equal(a1: &pmc->addr, a2: group)) |
523 | break; |
524 | } |
525 | if (!pmc) { /* must have a prior join */ |
526 | err = -EINVAL; |
527 | goto done; |
528 | } |
529 | if (gsf->gf_numsrc) { |
530 | newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, |
531 | gsf->gf_numsrc), |
532 | GFP_KERNEL); |
533 | if (!newpsl) { |
534 | err = -ENOBUFS; |
535 | goto done; |
536 | } |
537 | newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; |
538 | for (i = 0; i < newpsl->sl_count; ++i, ++list) { |
539 | struct sockaddr_in6 *psin6; |
540 | |
541 | psin6 = (struct sockaddr_in6 *)list; |
542 | newpsl->sl_addr[i] = psin6->sin6_addr; |
543 | } |
544 | mutex_lock(&idev->mc_lock); |
545 | err = ip6_mc_add_src(idev, pmca: group, sfmode: gsf->gf_fmode, |
546 | sfcount: newpsl->sl_count, psfsrc: newpsl->sl_addr, delta: 0); |
547 | if (err) { |
548 | mutex_unlock(lock: &idev->mc_lock); |
549 | sock_kfree_s(sk, mem: newpsl, struct_size(newpsl, sl_addr, |
550 | newpsl->sl_max)); |
551 | goto done; |
552 | } |
553 | mutex_unlock(lock: &idev->mc_lock); |
554 | } else { |
555 | newpsl = NULL; |
556 | mutex_lock(&idev->mc_lock); |
557 | ip6_mc_add_src(idev, pmca: group, sfmode: gsf->gf_fmode, sfcount: 0, NULL, delta: 0); |
558 | mutex_unlock(lock: &idev->mc_lock); |
559 | } |
560 | |
561 | mutex_lock(&idev->mc_lock); |
562 | psl = sock_dereference(pmc->sflist, sk); |
563 | if (psl) { |
564 | ip6_mc_del_src(idev, pmca: group, sfmode: pmc->sfmode, |
565 | sfcount: psl->sl_count, psfsrc: psl->sl_addr, delta: 0); |
566 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
567 | v: &sk->sk_omem_alloc); |
568 | } else { |
569 | ip6_mc_del_src(idev, pmca: group, sfmode: pmc->sfmode, sfcount: 0, NULL, delta: 0); |
570 | } |
571 | rcu_assign_pointer(pmc->sflist, newpsl); |
572 | mutex_unlock(lock: &idev->mc_lock); |
573 | kfree_rcu(psl, rcu); |
574 | pmc->sfmode = gsf->gf_fmode; |
575 | err = 0; |
576 | done: |
577 | if (leavegroup) |
578 | err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); |
579 | return err; |
580 | } |
581 | |
582 | int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, |
583 | sockptr_t optval, size_t ss_offset) |
584 | { |
585 | struct ipv6_pinfo *inet6 = inet6_sk(sk: sk); |
586 | const struct in6_addr *group; |
587 | struct ipv6_mc_socklist *pmc; |
588 | struct ip6_sf_socklist *psl; |
589 | int i, count, copycount; |
590 | |
591 | group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
592 | |
593 | if (!ipv6_addr_is_multicast(addr: group)) |
594 | return -EINVAL; |
595 | |
596 | /* changes to the ipv6_mc_list require the socket lock and |
597 | * rtnl lock. We have the socket lock, so reading the list is safe. |
598 | */ |
599 | |
600 | for_each_pmc_socklock(inet6, sk, pmc) { |
601 | if (pmc->ifindex != gsf->gf_interface) |
602 | continue; |
603 | if (ipv6_addr_equal(a1: group, a2: &pmc->addr)) |
604 | break; |
605 | } |
606 | if (!pmc) /* must have a prior join */ |
607 | return -EADDRNOTAVAIL; |
608 | |
609 | gsf->gf_fmode = pmc->sfmode; |
610 | psl = sock_dereference(pmc->sflist, sk); |
611 | count = psl ? psl->sl_count : 0; |
612 | |
613 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; |
614 | gsf->gf_numsrc = count; |
615 | for (i = 0; i < copycount; i++) { |
616 | struct sockaddr_in6 *psin6; |
617 | struct sockaddr_storage ss; |
618 | |
619 | psin6 = (struct sockaddr_in6 *)&ss; |
620 | memset(&ss, 0, sizeof(ss)); |
621 | psin6->sin6_family = AF_INET6; |
622 | psin6->sin6_addr = psl->sl_addr[i]; |
623 | if (copy_to_sockptr_offset(dst: optval, offset: ss_offset, src: &ss, size: sizeof(ss))) |
624 | return -EFAULT; |
625 | ss_offset += sizeof(ss); |
626 | } |
627 | return 0; |
628 | } |
629 | |
630 | bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr, |
631 | const struct in6_addr *src_addr) |
632 | { |
633 | const struct ipv6_pinfo *np = inet6_sk(sk: sk); |
634 | const struct ipv6_mc_socklist *mc; |
635 | const struct ip6_sf_socklist *psl; |
636 | bool rv = true; |
637 | |
638 | rcu_read_lock(); |
639 | for_each_pmc_rcu(np, mc) { |
640 | if (ipv6_addr_equal(a1: &mc->addr, a2: mc_addr)) |
641 | break; |
642 | } |
643 | if (!mc) { |
644 | rcu_read_unlock(); |
645 | return inet6_test_bit(MC6_ALL, sk); |
646 | } |
647 | psl = rcu_dereference(mc->sflist); |
648 | if (!psl) { |
649 | rv = mc->sfmode == MCAST_EXCLUDE; |
650 | } else { |
651 | int i; |
652 | |
653 | for (i = 0; i < psl->sl_count; i++) { |
654 | if (ipv6_addr_equal(a1: &psl->sl_addr[i], a2: src_addr)) |
655 | break; |
656 | } |
657 | if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
658 | rv = false; |
659 | if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
660 | rv = false; |
661 | } |
662 | rcu_read_unlock(); |
663 | |
664 | return rv; |
665 | } |
666 | |
667 | /* called with mc_lock */ |
668 | static void igmp6_group_added(struct ifmcaddr6 *mc) |
669 | { |
670 | struct net_device *dev = mc->idev->dev; |
671 | char buf[MAX_ADDR_LEN]; |
672 | |
673 | if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < |
674 | IPV6_ADDR_SCOPE_LINKLOCAL) |
675 | return; |
676 | |
677 | if (!(mc->mca_flags&MAF_LOADED)) { |
678 | mc->mca_flags |= MAF_LOADED; |
679 | if (ndisc_mc_map(addr: &mc->mca_addr, buf, dev, dir: 0) == 0) |
680 | dev_mc_add(dev, addr: buf); |
681 | } |
682 | |
683 | if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) |
684 | return; |
685 | |
686 | if (mld_in_v1_mode(idev: mc->idev)) { |
687 | igmp6_join_group(ma: mc); |
688 | return; |
689 | } |
690 | /* else v2 */ |
691 | |
692 | /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we |
693 | * should not send filter-mode change record as the mode |
694 | * should be from IN() to IN(A). |
695 | */ |
696 | if (mc->mca_sfmode == MCAST_EXCLUDE) |
697 | mc->mca_crcount = mc->idev->mc_qrv; |
698 | |
699 | mld_ifc_event(idev: mc->idev); |
700 | } |
701 | |
702 | /* called with mc_lock */ |
703 | static void igmp6_group_dropped(struct ifmcaddr6 *mc) |
704 | { |
705 | struct net_device *dev = mc->idev->dev; |
706 | char buf[MAX_ADDR_LEN]; |
707 | |
708 | if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < |
709 | IPV6_ADDR_SCOPE_LINKLOCAL) |
710 | return; |
711 | |
712 | if (mc->mca_flags&MAF_LOADED) { |
713 | mc->mca_flags &= ~MAF_LOADED; |
714 | if (ndisc_mc_map(addr: &mc->mca_addr, buf, dev, dir: 0) == 0) |
715 | dev_mc_del(dev, addr: buf); |
716 | } |
717 | |
718 | if (mc->mca_flags & MAF_NOREPORT) |
719 | return; |
720 | |
721 | if (!mc->idev->dead) |
722 | igmp6_leave_group(ma: mc); |
723 | |
724 | if (cancel_delayed_work(dwork: &mc->mca_work)) |
725 | refcount_dec(r: &mc->mca_refcnt); |
726 | } |
727 | |
728 | /* |
729 | * deleted ifmcaddr6 manipulation |
730 | * called with mc_lock |
731 | */ |
732 | static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) |
733 | { |
734 | struct ifmcaddr6 *pmc; |
735 | |
736 | /* this is an "ifmcaddr6" for convenience; only the fields below |
737 | * are actually used. In particular, the refcnt and users are not |
738 | * used for management of the delete list. Using the same structure |
739 | * for deleted items allows change reports to use common code with |
740 | * non-deleted or query-response MCA's. |
741 | */ |
742 | pmc = kzalloc(size: sizeof(*pmc), GFP_KERNEL); |
743 | if (!pmc) |
744 | return; |
745 | |
746 | pmc->idev = im->idev; |
747 | in6_dev_hold(idev); |
748 | pmc->mca_addr = im->mca_addr; |
749 | pmc->mca_crcount = idev->mc_qrv; |
750 | pmc->mca_sfmode = im->mca_sfmode; |
751 | if (pmc->mca_sfmode == MCAST_INCLUDE) { |
752 | struct ip6_sf_list *psf; |
753 | |
754 | rcu_assign_pointer(pmc->mca_tomb, |
755 | mc_dereference(im->mca_tomb, idev)); |
756 | rcu_assign_pointer(pmc->mca_sources, |
757 | mc_dereference(im->mca_sources, idev)); |
758 | RCU_INIT_POINTER(im->mca_tomb, NULL); |
759 | RCU_INIT_POINTER(im->mca_sources, NULL); |
760 | |
761 | for_each_psf_mclock(pmc, psf) |
762 | psf->sf_crcount = pmc->mca_crcount; |
763 | } |
764 | |
765 | rcu_assign_pointer(pmc->next, idev->mc_tomb); |
766 | rcu_assign_pointer(idev->mc_tomb, pmc); |
767 | } |
768 | |
769 | /* called with mc_lock */ |
770 | static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) |
771 | { |
772 | struct ip6_sf_list *psf, *sources, *tomb; |
773 | struct in6_addr *pmca = &im->mca_addr; |
774 | struct ifmcaddr6 *pmc, *pmc_prev; |
775 | |
776 | pmc_prev = NULL; |
777 | for_each_mc_tomb(idev, pmc) { |
778 | if (ipv6_addr_equal(a1: &pmc->mca_addr, a2: pmca)) |
779 | break; |
780 | pmc_prev = pmc; |
781 | } |
782 | if (pmc) { |
783 | if (pmc_prev) |
784 | rcu_assign_pointer(pmc_prev->next, pmc->next); |
785 | else |
786 | rcu_assign_pointer(idev->mc_tomb, pmc->next); |
787 | } |
788 | |
789 | if (pmc) { |
790 | im->idev = pmc->idev; |
791 | if (im->mca_sfmode == MCAST_INCLUDE) { |
792 | tomb = rcu_replace_pointer(im->mca_tomb, |
793 | mc_dereference(pmc->mca_tomb, pmc->idev), |
794 | lockdep_is_held(&im->idev->mc_lock)); |
795 | rcu_assign_pointer(pmc->mca_tomb, tomb); |
796 | |
797 | sources = rcu_replace_pointer(im->mca_sources, |
798 | mc_dereference(pmc->mca_sources, pmc->idev), |
799 | lockdep_is_held(&im->idev->mc_lock)); |
800 | rcu_assign_pointer(pmc->mca_sources, sources); |
801 | for_each_psf_mclock(im, psf) |
802 | psf->sf_crcount = idev->mc_qrv; |
803 | } else { |
804 | im->mca_crcount = idev->mc_qrv; |
805 | } |
806 | in6_dev_put(idev: pmc->idev); |
807 | ip6_mc_clear_src(pmc); |
808 | kfree_rcu(pmc, rcu); |
809 | } |
810 | } |
811 | |
812 | /* called with mc_lock */ |
813 | static void mld_clear_delrec(struct inet6_dev *idev) |
814 | { |
815 | struct ifmcaddr6 *pmc, *nextpmc; |
816 | |
817 | pmc = mc_dereference(idev->mc_tomb, idev); |
818 | RCU_INIT_POINTER(idev->mc_tomb, NULL); |
819 | |
820 | for (; pmc; pmc = nextpmc) { |
821 | nextpmc = mc_dereference(pmc->next, idev); |
822 | ip6_mc_clear_src(pmc); |
823 | in6_dev_put(idev: pmc->idev); |
824 | kfree_rcu(pmc, rcu); |
825 | } |
826 | |
827 | /* clear dead sources, too */ |
828 | for_each_mc_mclock(idev, pmc) { |
829 | struct ip6_sf_list *psf, *psf_next; |
830 | |
831 | psf = mc_dereference(pmc->mca_tomb, idev); |
832 | RCU_INIT_POINTER(pmc->mca_tomb, NULL); |
833 | for (; psf; psf = psf_next) { |
834 | psf_next = mc_dereference(psf->sf_next, idev); |
835 | kfree_rcu(psf, rcu); |
836 | } |
837 | } |
838 | } |
839 | |
840 | static void mld_clear_query(struct inet6_dev *idev) |
841 | { |
842 | struct sk_buff *skb; |
843 | |
844 | spin_lock_bh(lock: &idev->mc_query_lock); |
845 | while ((skb = __skb_dequeue(list: &idev->mc_query_queue))) |
846 | kfree_skb(skb); |
847 | spin_unlock_bh(lock: &idev->mc_query_lock); |
848 | } |
849 | |
850 | static void mld_clear_report(struct inet6_dev *idev) |
851 | { |
852 | struct sk_buff *skb; |
853 | |
854 | spin_lock_bh(lock: &idev->mc_report_lock); |
855 | while ((skb = __skb_dequeue(list: &idev->mc_report_queue))) |
856 | kfree_skb(skb); |
857 | spin_unlock_bh(lock: &idev->mc_report_lock); |
858 | } |
859 | |
860 | static void mca_get(struct ifmcaddr6 *mc) |
861 | { |
862 | refcount_inc(r: &mc->mca_refcnt); |
863 | } |
864 | |
865 | static void ma_put(struct ifmcaddr6 *mc) |
866 | { |
867 | if (refcount_dec_and_test(r: &mc->mca_refcnt)) { |
868 | in6_dev_put(idev: mc->idev); |
869 | kfree_rcu(mc, rcu); |
870 | } |
871 | } |
872 | |
873 | /* called with mc_lock */ |
874 | static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, |
875 | const struct in6_addr *addr, |
876 | unsigned int mode) |
877 | { |
878 | struct ifmcaddr6 *mc; |
879 | |
880 | mc = kzalloc(size: sizeof(*mc), GFP_KERNEL); |
881 | if (!mc) |
882 | return NULL; |
883 | |
884 | INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work); |
885 | |
886 | mc->mca_addr = *addr; |
887 | mc->idev = idev; /* reference taken by caller */ |
888 | mc->mca_users = 1; |
889 | /* mca_stamp should be updated upon changes */ |
890 | mc->mca_cstamp = mc->mca_tstamp = jiffies; |
891 | refcount_set(r: &mc->mca_refcnt, n: 1); |
892 | |
893 | mc->mca_sfmode = mode; |
894 | mc->mca_sfcount[mode] = 1; |
895 | |
896 | if (ipv6_addr_is_ll_all_nodes(addr: &mc->mca_addr) || |
897 | IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
898 | mc->mca_flags |= MAF_NOREPORT; |
899 | |
900 | return mc; |
901 | } |
902 | |
903 | /* |
904 | * device multicast group inc (add if not found) |
905 | */ |
906 | static int __ipv6_dev_mc_inc(struct net_device *dev, |
907 | const struct in6_addr *addr, unsigned int mode) |
908 | { |
909 | struct ifmcaddr6 *mc; |
910 | struct inet6_dev *idev; |
911 | |
912 | ASSERT_RTNL(); |
913 | |
914 | /* we need to take a reference on idev */ |
915 | idev = in6_dev_get(dev); |
916 | |
917 | if (!idev) |
918 | return -EINVAL; |
919 | |
920 | if (idev->dead) { |
921 | in6_dev_put(idev); |
922 | return -ENODEV; |
923 | } |
924 | |
925 | mutex_lock(&idev->mc_lock); |
926 | for_each_mc_mclock(idev, mc) { |
927 | if (ipv6_addr_equal(a1: &mc->mca_addr, a2: addr)) { |
928 | mc->mca_users++; |
929 | ip6_mc_add_src(idev, pmca: &mc->mca_addr, sfmode: mode, sfcount: 0, NULL, delta: 0); |
930 | mutex_unlock(lock: &idev->mc_lock); |
931 | in6_dev_put(idev); |
932 | return 0; |
933 | } |
934 | } |
935 | |
936 | mc = mca_alloc(idev, addr, mode); |
937 | if (!mc) { |
938 | mutex_unlock(lock: &idev->mc_lock); |
939 | in6_dev_put(idev); |
940 | return -ENOMEM; |
941 | } |
942 | |
943 | rcu_assign_pointer(mc->next, idev->mc_list); |
944 | rcu_assign_pointer(idev->mc_list, mc); |
945 | |
946 | mca_get(mc); |
947 | |
948 | mld_del_delrec(idev, im: mc); |
949 | igmp6_group_added(mc); |
950 | mutex_unlock(lock: &idev->mc_lock); |
951 | ma_put(mc); |
952 | return 0; |
953 | } |
954 | |
955 | int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) |
956 | { |
957 | return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); |
958 | } |
959 | EXPORT_SYMBOL(ipv6_dev_mc_inc); |
960 | |
961 | /* |
962 | * device multicast group del |
963 | */ |
964 | int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
965 | { |
966 | struct ifmcaddr6 *ma, __rcu **map; |
967 | |
968 | ASSERT_RTNL(); |
969 | |
970 | mutex_lock(&idev->mc_lock); |
971 | for (map = &idev->mc_list; |
972 | (ma = mc_dereference(*map, idev)); |
973 | map = &ma->next) { |
974 | if (ipv6_addr_equal(a1: &ma->mca_addr, a2: addr)) { |
975 | if (--ma->mca_users == 0) { |
976 | *map = ma->next; |
977 | |
978 | igmp6_group_dropped(mc: ma); |
979 | ip6_mc_clear_src(pmc: ma); |
980 | mutex_unlock(lock: &idev->mc_lock); |
981 | |
982 | ma_put(mc: ma); |
983 | return 0; |
984 | } |
985 | mutex_unlock(lock: &idev->mc_lock); |
986 | return 0; |
987 | } |
988 | } |
989 | |
990 | mutex_unlock(lock: &idev->mc_lock); |
991 | return -ENOENT; |
992 | } |
993 | |
994 | int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) |
995 | { |
996 | struct inet6_dev *idev; |
997 | int err; |
998 | |
999 | ASSERT_RTNL(); |
1000 | |
1001 | idev = __in6_dev_get(dev); |
1002 | if (!idev) |
1003 | err = -ENODEV; |
1004 | else |
1005 | err = __ipv6_dev_mc_dec(idev, addr); |
1006 | |
1007 | return err; |
1008 | } |
1009 | EXPORT_SYMBOL(ipv6_dev_mc_dec); |
1010 | |
1011 | /* |
1012 | * check if the interface/address pair is valid |
1013 | */ |
1014 | bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, |
1015 | const struct in6_addr *src_addr) |
1016 | { |
1017 | struct inet6_dev *idev; |
1018 | struct ifmcaddr6 *mc; |
1019 | bool rv = false; |
1020 | |
1021 | rcu_read_lock(); |
1022 | idev = __in6_dev_get(dev); |
1023 | if (idev) { |
1024 | for_each_mc_rcu(idev, mc) { |
1025 | if (ipv6_addr_equal(a1: &mc->mca_addr, a2: group)) |
1026 | break; |
1027 | } |
1028 | if (mc) { |
1029 | if (src_addr && !ipv6_addr_any(a: src_addr)) { |
1030 | struct ip6_sf_list *psf; |
1031 | |
1032 | for_each_psf_rcu(mc, psf) { |
1033 | if (ipv6_addr_equal(a1: &psf->sf_addr, a2: src_addr)) |
1034 | break; |
1035 | } |
1036 | if (psf) |
1037 | rv = psf->sf_count[MCAST_INCLUDE] || |
1038 | psf->sf_count[MCAST_EXCLUDE] != |
1039 | mc->mca_sfcount[MCAST_EXCLUDE]; |
1040 | else |
1041 | rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; |
1042 | } else |
1043 | rv = true; /* don't filter unspecified source */ |
1044 | } |
1045 | } |
1046 | rcu_read_unlock(); |
1047 | return rv; |
1048 | } |
1049 | |
1050 | /* called with mc_lock */ |
1051 | static void mld_gq_start_work(struct inet6_dev *idev) |
1052 | { |
1053 | unsigned long tv = get_random_u32_below(ceil: idev->mc_maxdelay); |
1054 | |
1055 | idev->mc_gq_running = 1; |
1056 | if (!mod_delayed_work(wq: mld_wq, dwork: &idev->mc_gq_work, delay: tv + 2)) |
1057 | in6_dev_hold(idev); |
1058 | } |
1059 | |
1060 | /* called with mc_lock */ |
1061 | static void mld_gq_stop_work(struct inet6_dev *idev) |
1062 | { |
1063 | idev->mc_gq_running = 0; |
1064 | if (cancel_delayed_work(dwork: &idev->mc_gq_work)) |
1065 | __in6_dev_put(idev); |
1066 | } |
1067 | |
1068 | /* called with mc_lock */ |
1069 | static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay) |
1070 | { |
1071 | unsigned long tv = get_random_u32_below(ceil: delay); |
1072 | |
1073 | if (!mod_delayed_work(wq: mld_wq, dwork: &idev->mc_ifc_work, delay: tv + 2)) |
1074 | in6_dev_hold(idev); |
1075 | } |
1076 | |
1077 | /* called with mc_lock */ |
1078 | static void mld_ifc_stop_work(struct inet6_dev *idev) |
1079 | { |
1080 | idev->mc_ifc_count = 0; |
1081 | if (cancel_delayed_work(dwork: &idev->mc_ifc_work)) |
1082 | __in6_dev_put(idev); |
1083 | } |
1084 | |
1085 | /* called with mc_lock */ |
1086 | static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay) |
1087 | { |
1088 | unsigned long tv = get_random_u32_below(ceil: delay); |
1089 | |
1090 | if (!mod_delayed_work(wq: mld_wq, dwork: &idev->mc_dad_work, delay: tv + 2)) |
1091 | in6_dev_hold(idev); |
1092 | } |
1093 | |
1094 | static void mld_dad_stop_work(struct inet6_dev *idev) |
1095 | { |
1096 | if (cancel_delayed_work(dwork: &idev->mc_dad_work)) |
1097 | __in6_dev_put(idev); |
1098 | } |
1099 | |
1100 | static void mld_query_stop_work(struct inet6_dev *idev) |
1101 | { |
1102 | spin_lock_bh(lock: &idev->mc_query_lock); |
1103 | if (cancel_delayed_work(dwork: &idev->mc_query_work)) |
1104 | __in6_dev_put(idev); |
1105 | spin_unlock_bh(lock: &idev->mc_query_lock); |
1106 | } |
1107 | |
1108 | static void mld_report_stop_work(struct inet6_dev *idev) |
1109 | { |
1110 | if (cancel_delayed_work_sync(dwork: &idev->mc_report_work)) |
1111 | __in6_dev_put(idev); |
1112 | } |
1113 | |
1114 | /* |
1115 | * IGMP handling (alias multicast ICMPv6 messages) |
1116 | * called with mc_lock |
1117 | */ |
1118 | static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) |
1119 | { |
1120 | unsigned long delay = resptime; |
1121 | |
1122 | /* Do not start work for these addresses */ |
1123 | if (ipv6_addr_is_ll_all_nodes(addr: &ma->mca_addr) || |
1124 | IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
1125 | return; |
1126 | |
1127 | if (cancel_delayed_work(dwork: &ma->mca_work)) { |
1128 | refcount_dec(r: &ma->mca_refcnt); |
1129 | delay = ma->mca_work.timer.expires - jiffies; |
1130 | } |
1131 | |
1132 | if (delay >= resptime) |
1133 | delay = get_random_u32_below(ceil: resptime); |
1134 | |
1135 | if (!mod_delayed_work(wq: mld_wq, dwork: &ma->mca_work, delay)) |
1136 | refcount_inc(r: &ma->mca_refcnt); |
1137 | ma->mca_flags |= MAF_TIMER_RUNNING; |
1138 | } |
1139 | |
1140 | /* mark EXCLUDE-mode sources |
1141 | * called with mc_lock |
1142 | */ |
1143 | static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, |
1144 | const struct in6_addr *srcs) |
1145 | { |
1146 | struct ip6_sf_list *psf; |
1147 | int i, scount; |
1148 | |
1149 | scount = 0; |
1150 | for_each_psf_mclock(pmc, psf) { |
1151 | if (scount == nsrcs) |
1152 | break; |
1153 | for (i = 0; i < nsrcs; i++) { |
1154 | /* skip inactive filters */ |
1155 | if (psf->sf_count[MCAST_INCLUDE] || |
1156 | pmc->mca_sfcount[MCAST_EXCLUDE] != |
1157 | psf->sf_count[MCAST_EXCLUDE]) |
1158 | break; |
1159 | if (ipv6_addr_equal(a1: &srcs[i], a2: &psf->sf_addr)) { |
1160 | scount++; |
1161 | break; |
1162 | } |
1163 | } |
1164 | } |
1165 | pmc->mca_flags &= ~MAF_GSQUERY; |
1166 | if (scount == nsrcs) /* all sources excluded */ |
1167 | return false; |
1168 | return true; |
1169 | } |
1170 | |
1171 | /* called with mc_lock */ |
1172 | static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, |
1173 | const struct in6_addr *srcs) |
1174 | { |
1175 | struct ip6_sf_list *psf; |
1176 | int i, scount; |
1177 | |
1178 | if (pmc->mca_sfmode == MCAST_EXCLUDE) |
1179 | return mld_xmarksources(pmc, nsrcs, srcs); |
1180 | |
1181 | /* mark INCLUDE-mode sources */ |
1182 | |
1183 | scount = 0; |
1184 | for_each_psf_mclock(pmc, psf) { |
1185 | if (scount == nsrcs) |
1186 | break; |
1187 | for (i = 0; i < nsrcs; i++) { |
1188 | if (ipv6_addr_equal(a1: &srcs[i], a2: &psf->sf_addr)) { |
1189 | psf->sf_gsresp = 1; |
1190 | scount++; |
1191 | break; |
1192 | } |
1193 | } |
1194 | } |
1195 | if (!scount) { |
1196 | pmc->mca_flags &= ~MAF_GSQUERY; |
1197 | return false; |
1198 | } |
1199 | pmc->mca_flags |= MAF_GSQUERY; |
1200 | return true; |
1201 | } |
1202 | |
1203 | static int mld_force_mld_version(const struct inet6_dev *idev) |
1204 | { |
1205 | /* Normally, both are 0 here. If enforcement to a particular is |
1206 | * being used, individual device enforcement will have a lower |
1207 | * precedence over 'all' device (.../conf/all/force_mld_version). |
1208 | */ |
1209 | |
1210 | if (dev_net(dev: idev->dev)->ipv6.devconf_all->force_mld_version != 0) |
1211 | return dev_net(dev: idev->dev)->ipv6.devconf_all->force_mld_version; |
1212 | else |
1213 | return idev->cnf.force_mld_version; |
1214 | } |
1215 | |
1216 | static bool mld_in_v2_mode_only(const struct inet6_dev *idev) |
1217 | { |
1218 | return mld_force_mld_version(idev) == 2; |
1219 | } |
1220 | |
1221 | static bool mld_in_v1_mode_only(const struct inet6_dev *idev) |
1222 | { |
1223 | return mld_force_mld_version(idev) == 1; |
1224 | } |
1225 | |
1226 | static bool mld_in_v1_mode(const struct inet6_dev *idev) |
1227 | { |
1228 | if (mld_in_v2_mode_only(idev)) |
1229 | return false; |
1230 | if (mld_in_v1_mode_only(idev)) |
1231 | return true; |
1232 | if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) |
1233 | return true; |
1234 | |
1235 | return false; |
1236 | } |
1237 | |
1238 | static void mld_set_v1_mode(struct inet6_dev *idev) |
1239 | { |
1240 | /* RFC3810, relevant sections: |
1241 | * - 9.1. Robustness Variable |
1242 | * - 9.2. Query Interval |
1243 | * - 9.3. Query Response Interval |
1244 | * - 9.12. Older Version Querier Present Timeout |
1245 | */ |
1246 | unsigned long switchback; |
1247 | |
1248 | switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; |
1249 | |
1250 | idev->mc_v1_seen = jiffies + switchback; |
1251 | } |
1252 | |
1253 | static void mld_update_qrv(struct inet6_dev *idev, |
1254 | const struct mld2_query *mlh2) |
1255 | { |
1256 | /* RFC3810, relevant sections: |
1257 | * - 5.1.8. QRV (Querier's Robustness Variable) |
1258 | * - 9.1. Robustness Variable |
1259 | */ |
1260 | |
1261 | /* The value of the Robustness Variable MUST NOT be zero, |
1262 | * and SHOULD NOT be one. Catch this here if we ever run |
1263 | * into such a case in future. |
1264 | */ |
1265 | const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); |
1266 | WARN_ON(idev->mc_qrv == 0); |
1267 | |
1268 | if (mlh2->mld2q_qrv > 0) |
1269 | idev->mc_qrv = mlh2->mld2q_qrv; |
1270 | |
1271 | if (unlikely(idev->mc_qrv < min_qrv)) { |
1272 | net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n" , |
1273 | idev->mc_qrv, min_qrv); |
1274 | idev->mc_qrv = min_qrv; |
1275 | } |
1276 | } |
1277 | |
1278 | static void mld_update_qi(struct inet6_dev *idev, |
1279 | const struct mld2_query *mlh2) |
1280 | { |
1281 | /* RFC3810, relevant sections: |
1282 | * - 5.1.9. QQIC (Querier's Query Interval Code) |
1283 | * - 9.2. Query Interval |
1284 | * - 9.12. Older Version Querier Present Timeout |
1285 | * (the [Query Interval] in the last Query received) |
1286 | */ |
1287 | unsigned long mc_qqi; |
1288 | |
1289 | if (mlh2->mld2q_qqic < 128) { |
1290 | mc_qqi = mlh2->mld2q_qqic; |
1291 | } else { |
1292 | unsigned long mc_man, mc_exp; |
1293 | |
1294 | mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); |
1295 | mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); |
1296 | |
1297 | mc_qqi = (mc_man | 0x10) << (mc_exp + 3); |
1298 | } |
1299 | |
1300 | idev->mc_qi = mc_qqi * HZ; |
1301 | } |
1302 | |
1303 | static void mld_update_qri(struct inet6_dev *idev, |
1304 | const struct mld2_query *mlh2) |
1305 | { |
1306 | /* RFC3810, relevant sections: |
1307 | * - 5.1.3. Maximum Response Code |
1308 | * - 9.3. Query Response Interval |
1309 | */ |
1310 | idev->mc_qri = msecs_to_jiffies(m: mldv2_mrc(mlh2)); |
1311 | } |
1312 | |
1313 | static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, |
1314 | unsigned long *max_delay, bool v1_query) |
1315 | { |
1316 | unsigned long mldv1_md; |
1317 | |
1318 | /* Ignore v1 queries */ |
1319 | if (mld_in_v2_mode_only(idev)) |
1320 | return -EINVAL; |
1321 | |
1322 | mldv1_md = ntohs(mld->mld_maxdelay); |
1323 | |
1324 | /* When in MLDv1 fallback and a MLDv2 router start-up being |
1325 | * unaware of current MLDv1 operation, the MRC == MRD mapping |
1326 | * only works when the exponential algorithm is not being |
1327 | * used (as MLDv1 is unaware of such things). |
1328 | * |
1329 | * According to the RFC author, the MLDv2 implementations |
1330 | * he's aware of all use a MRC < 32768 on start up queries. |
1331 | * |
1332 | * Thus, should we *ever* encounter something else larger |
1333 | * than that, just assume the maximum possible within our |
1334 | * reach. |
1335 | */ |
1336 | if (!v1_query) |
1337 | mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); |
1338 | |
1339 | *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); |
1340 | |
1341 | /* MLDv1 router present: we need to go into v1 mode *only* |
1342 | * when an MLDv1 query is received as per section 9.12. of |
1343 | * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 |
1344 | * queries MUST be of exactly 24 octets. |
1345 | */ |
1346 | if (v1_query) |
1347 | mld_set_v1_mode(idev); |
1348 | |
1349 | /* cancel MLDv2 report work */ |
1350 | mld_gq_stop_work(idev); |
1351 | /* cancel the interface change work */ |
1352 | mld_ifc_stop_work(idev); |
1353 | /* clear deleted report items */ |
1354 | mld_clear_delrec(idev); |
1355 | |
1356 | return 0; |
1357 | } |
1358 | |
1359 | static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, |
1360 | unsigned long *max_delay) |
1361 | { |
1362 | *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); |
1363 | |
1364 | mld_update_qrv(idev, mlh2: mld); |
1365 | mld_update_qi(idev, mlh2: mld); |
1366 | mld_update_qri(idev, mlh2: mld); |
1367 | |
1368 | idev->mc_maxdelay = *max_delay; |
1369 | |
1370 | return; |
1371 | } |
1372 | |
1373 | /* called with rcu_read_lock() */ |
1374 | void igmp6_event_query(struct sk_buff *skb) |
1375 | { |
1376 | struct inet6_dev *idev = __in6_dev_get(dev: skb->dev); |
1377 | |
1378 | if (!idev || idev->dead) |
1379 | goto out; |
1380 | |
1381 | spin_lock_bh(lock: &idev->mc_query_lock); |
1382 | if (skb_queue_len(list_: &idev->mc_query_queue) < MLD_MAX_SKBS) { |
1383 | __skb_queue_tail(list: &idev->mc_query_queue, newsk: skb); |
1384 | if (!mod_delayed_work(wq: mld_wq, dwork: &idev->mc_query_work, delay: 0)) |
1385 | in6_dev_hold(idev); |
1386 | skb = NULL; |
1387 | } |
1388 | spin_unlock_bh(lock: &idev->mc_query_lock); |
1389 | out: |
1390 | kfree_skb(skb); |
1391 | } |
1392 | |
1393 | static void __mld_query_work(struct sk_buff *skb) |
1394 | { |
1395 | struct mld2_query *mlh2 = NULL; |
1396 | const struct in6_addr *group; |
1397 | unsigned long max_delay; |
1398 | struct inet6_dev *idev; |
1399 | struct ifmcaddr6 *ma; |
1400 | struct mld_msg *mld; |
1401 | int group_type; |
1402 | int mark = 0; |
1403 | int len, err; |
1404 | |
1405 | if (!pskb_may_pull(skb, len: sizeof(struct in6_addr))) |
1406 | goto kfree_skb; |
1407 | |
1408 | /* compute payload length excluding extension headers */ |
1409 | len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); |
1410 | len -= skb_network_header_len(skb); |
1411 | |
1412 | /* RFC3810 6.2 |
1413 | * Upon reception of an MLD message that contains a Query, the node |
1414 | * checks if the source address of the message is a valid link-local |
1415 | * address, if the Hop Limit is set to 1, and if the Router Alert |
1416 | * option is present in the Hop-By-Hop Options header of the IPv6 |
1417 | * packet. If any of these checks fails, the packet is dropped. |
1418 | */ |
1419 | if (!(ipv6_addr_type(addr: &ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || |
1420 | ipv6_hdr(skb)->hop_limit != 1 || |
1421 | !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || |
1422 | IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) |
1423 | goto kfree_skb; |
1424 | |
1425 | idev = in6_dev_get(dev: skb->dev); |
1426 | if (!idev) |
1427 | goto kfree_skb; |
1428 | |
1429 | mld = (struct mld_msg *)icmp6_hdr(skb); |
1430 | group = &mld->mld_mca; |
1431 | group_type = ipv6_addr_type(addr: group); |
1432 | |
1433 | if (group_type != IPV6_ADDR_ANY && |
1434 | !(group_type&IPV6_ADDR_MULTICAST)) |
1435 | goto out; |
1436 | |
1437 | if (len < MLD_V1_QUERY_LEN) { |
1438 | goto out; |
1439 | } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { |
1440 | err = mld_process_v1(idev, mld, max_delay: &max_delay, |
1441 | v1_query: len == MLD_V1_QUERY_LEN); |
1442 | if (err < 0) |
1443 | goto out; |
1444 | } else if (len >= MLD_V2_QUERY_LEN_MIN) { |
1445 | int srcs_offset = sizeof(struct mld2_query) - |
1446 | sizeof(struct icmp6hdr); |
1447 | |
1448 | if (!pskb_may_pull(skb, len: srcs_offset)) |
1449 | goto out; |
1450 | |
1451 | mlh2 = (struct mld2_query *)skb_transport_header(skb); |
1452 | |
1453 | mld_process_v2(idev, mld: mlh2, max_delay: &max_delay); |
1454 | |
1455 | if (group_type == IPV6_ADDR_ANY) { /* general query */ |
1456 | if (mlh2->mld2q_nsrcs) |
1457 | goto out; /* no sources allowed */ |
1458 | |
1459 | mld_gq_start_work(idev); |
1460 | goto out; |
1461 | } |
1462 | /* mark sources to include, if group & source-specific */ |
1463 | if (mlh2->mld2q_nsrcs != 0) { |
1464 | if (!pskb_may_pull(skb, len: srcs_offset + |
1465 | ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) |
1466 | goto out; |
1467 | |
1468 | mlh2 = (struct mld2_query *)skb_transport_header(skb); |
1469 | mark = 1; |
1470 | } |
1471 | } else { |
1472 | goto out; |
1473 | } |
1474 | |
1475 | if (group_type == IPV6_ADDR_ANY) { |
1476 | for_each_mc_mclock(idev, ma) { |
1477 | igmp6_group_queried(ma, resptime: max_delay); |
1478 | } |
1479 | } else { |
1480 | for_each_mc_mclock(idev, ma) { |
1481 | if (!ipv6_addr_equal(a1: group, a2: &ma->mca_addr)) |
1482 | continue; |
1483 | if (ma->mca_flags & MAF_TIMER_RUNNING) { |
1484 | /* gsquery <- gsquery && mark */ |
1485 | if (!mark) |
1486 | ma->mca_flags &= ~MAF_GSQUERY; |
1487 | } else { |
1488 | /* gsquery <- mark */ |
1489 | if (mark) |
1490 | ma->mca_flags |= MAF_GSQUERY; |
1491 | else |
1492 | ma->mca_flags &= ~MAF_GSQUERY; |
1493 | } |
1494 | if (!(ma->mca_flags & MAF_GSQUERY) || |
1495 | mld_marksources(pmc: ma, ntohs(mlh2->mld2q_nsrcs), srcs: mlh2->mld2q_srcs)) |
1496 | igmp6_group_queried(ma, resptime: max_delay); |
1497 | break; |
1498 | } |
1499 | } |
1500 | |
1501 | out: |
1502 | in6_dev_put(idev); |
1503 | kfree_skb: |
1504 | consume_skb(skb); |
1505 | } |
1506 | |
1507 | static void mld_query_work(struct work_struct *work) |
1508 | { |
1509 | struct inet6_dev *idev = container_of(to_delayed_work(work), |
1510 | struct inet6_dev, |
1511 | mc_query_work); |
1512 | struct sk_buff_head q; |
1513 | struct sk_buff *skb; |
1514 | bool rework = false; |
1515 | int cnt = 0; |
1516 | |
1517 | skb_queue_head_init(list: &q); |
1518 | |
1519 | spin_lock_bh(lock: &idev->mc_query_lock); |
1520 | while ((skb = __skb_dequeue(list: &idev->mc_query_queue))) { |
1521 | __skb_queue_tail(list: &q, newsk: skb); |
1522 | |
1523 | if (++cnt >= MLD_MAX_QUEUE) { |
1524 | rework = true; |
1525 | break; |
1526 | } |
1527 | } |
1528 | spin_unlock_bh(lock: &idev->mc_query_lock); |
1529 | |
1530 | mutex_lock(&idev->mc_lock); |
1531 | while ((skb = __skb_dequeue(list: &q))) |
1532 | __mld_query_work(skb); |
1533 | mutex_unlock(lock: &idev->mc_lock); |
1534 | |
1535 | if (rework && queue_delayed_work(wq: mld_wq, dwork: &idev->mc_query_work, delay: 0)) |
1536 | return; |
1537 | |
1538 | in6_dev_put(idev); |
1539 | } |
1540 | |
1541 | /* called with rcu_read_lock() */ |
1542 | void igmp6_event_report(struct sk_buff *skb) |
1543 | { |
1544 | struct inet6_dev *idev = __in6_dev_get(dev: skb->dev); |
1545 | |
1546 | if (!idev || idev->dead) |
1547 | goto out; |
1548 | |
1549 | spin_lock_bh(lock: &idev->mc_report_lock); |
1550 | if (skb_queue_len(list_: &idev->mc_report_queue) < MLD_MAX_SKBS) { |
1551 | __skb_queue_tail(list: &idev->mc_report_queue, newsk: skb); |
1552 | if (!mod_delayed_work(wq: mld_wq, dwork: &idev->mc_report_work, delay: 0)) |
1553 | in6_dev_hold(idev); |
1554 | skb = NULL; |
1555 | } |
1556 | spin_unlock_bh(lock: &idev->mc_report_lock); |
1557 | out: |
1558 | kfree_skb(skb); |
1559 | } |
1560 | |
1561 | static void __mld_report_work(struct sk_buff *skb) |
1562 | { |
1563 | struct inet6_dev *idev; |
1564 | struct ifmcaddr6 *ma; |
1565 | struct mld_msg *mld; |
1566 | int addr_type; |
1567 | |
1568 | /* Our own report looped back. Ignore it. */ |
1569 | if (skb->pkt_type == PACKET_LOOPBACK) |
1570 | goto kfree_skb; |
1571 | |
1572 | /* send our report if the MC router may not have heard this report */ |
1573 | if (skb->pkt_type != PACKET_MULTICAST && |
1574 | skb->pkt_type != PACKET_BROADCAST) |
1575 | goto kfree_skb; |
1576 | |
1577 | if (!pskb_may_pull(skb, len: sizeof(*mld) - sizeof(struct icmp6hdr))) |
1578 | goto kfree_skb; |
1579 | |
1580 | mld = (struct mld_msg *)icmp6_hdr(skb); |
1581 | |
1582 | /* Drop reports with not link local source */ |
1583 | addr_type = ipv6_addr_type(addr: &ipv6_hdr(skb)->saddr); |
1584 | if (addr_type != IPV6_ADDR_ANY && |
1585 | !(addr_type&IPV6_ADDR_LINKLOCAL)) |
1586 | goto kfree_skb; |
1587 | |
1588 | idev = in6_dev_get(dev: skb->dev); |
1589 | if (!idev) |
1590 | goto kfree_skb; |
1591 | |
1592 | /* |
1593 | * Cancel the work for this group |
1594 | */ |
1595 | |
1596 | for_each_mc_mclock(idev, ma) { |
1597 | if (ipv6_addr_equal(a1: &ma->mca_addr, a2: &mld->mld_mca)) { |
1598 | if (cancel_delayed_work(dwork: &ma->mca_work)) |
1599 | refcount_dec(r: &ma->mca_refcnt); |
1600 | ma->mca_flags &= ~(MAF_LAST_REPORTER | |
1601 | MAF_TIMER_RUNNING); |
1602 | break; |
1603 | } |
1604 | } |
1605 | |
1606 | in6_dev_put(idev); |
1607 | kfree_skb: |
1608 | consume_skb(skb); |
1609 | } |
1610 | |
1611 | static void mld_report_work(struct work_struct *work) |
1612 | { |
1613 | struct inet6_dev *idev = container_of(to_delayed_work(work), |
1614 | struct inet6_dev, |
1615 | mc_report_work); |
1616 | struct sk_buff_head q; |
1617 | struct sk_buff *skb; |
1618 | bool rework = false; |
1619 | int cnt = 0; |
1620 | |
1621 | skb_queue_head_init(list: &q); |
1622 | spin_lock_bh(lock: &idev->mc_report_lock); |
1623 | while ((skb = __skb_dequeue(list: &idev->mc_report_queue))) { |
1624 | __skb_queue_tail(list: &q, newsk: skb); |
1625 | |
1626 | if (++cnt >= MLD_MAX_QUEUE) { |
1627 | rework = true; |
1628 | break; |
1629 | } |
1630 | } |
1631 | spin_unlock_bh(lock: &idev->mc_report_lock); |
1632 | |
1633 | mutex_lock(&idev->mc_lock); |
1634 | while ((skb = __skb_dequeue(list: &q))) |
1635 | __mld_report_work(skb); |
1636 | mutex_unlock(lock: &idev->mc_lock); |
1637 | |
1638 | if (rework && queue_delayed_work(wq: mld_wq, dwork: &idev->mc_report_work, delay: 0)) |
1639 | return; |
1640 | |
1641 | in6_dev_put(idev); |
1642 | } |
1643 | |
1644 | static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, |
1645 | int gdeleted, int sdeleted) |
1646 | { |
1647 | switch (type) { |
1648 | case MLD2_MODE_IS_INCLUDE: |
1649 | case MLD2_MODE_IS_EXCLUDE: |
1650 | if (gdeleted || sdeleted) |
1651 | return false; |
1652 | if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { |
1653 | if (pmc->mca_sfmode == MCAST_INCLUDE) |
1654 | return true; |
1655 | /* don't include if this source is excluded |
1656 | * in all filters |
1657 | */ |
1658 | if (psf->sf_count[MCAST_INCLUDE]) |
1659 | return type == MLD2_MODE_IS_INCLUDE; |
1660 | return pmc->mca_sfcount[MCAST_EXCLUDE] == |
1661 | psf->sf_count[MCAST_EXCLUDE]; |
1662 | } |
1663 | return false; |
1664 | case MLD2_CHANGE_TO_INCLUDE: |
1665 | if (gdeleted || sdeleted) |
1666 | return false; |
1667 | return psf->sf_count[MCAST_INCLUDE] != 0; |
1668 | case MLD2_CHANGE_TO_EXCLUDE: |
1669 | if (gdeleted || sdeleted) |
1670 | return false; |
1671 | if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || |
1672 | psf->sf_count[MCAST_INCLUDE]) |
1673 | return false; |
1674 | return pmc->mca_sfcount[MCAST_EXCLUDE] == |
1675 | psf->sf_count[MCAST_EXCLUDE]; |
1676 | case MLD2_ALLOW_NEW_SOURCES: |
1677 | if (gdeleted || !psf->sf_crcount) |
1678 | return false; |
1679 | return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; |
1680 | case MLD2_BLOCK_OLD_SOURCES: |
1681 | if (pmc->mca_sfmode == MCAST_INCLUDE) |
1682 | return gdeleted || (psf->sf_crcount && sdeleted); |
1683 | return psf->sf_crcount && !gdeleted && !sdeleted; |
1684 | } |
1685 | return false; |
1686 | } |
1687 | |
1688 | static int |
1689 | mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) |
1690 | { |
1691 | struct ip6_sf_list *psf; |
1692 | int scount = 0; |
1693 | |
1694 | for_each_psf_mclock(pmc, psf) { |
1695 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
1696 | continue; |
1697 | scount++; |
1698 | } |
1699 | return scount; |
1700 | } |
1701 | |
1702 | static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb, |
1703 | struct net_device *dev, const struct in6_addr *saddr, |
1704 | const struct in6_addr *daddr, int proto, int len) |
1705 | { |
1706 | struct ipv6hdr *hdr; |
1707 | |
1708 | skb->protocol = htons(ETH_P_IPV6); |
1709 | skb->dev = dev; |
1710 | |
1711 | skb_reset_network_header(skb); |
1712 | skb_put(skb, len: sizeof(struct ipv6hdr)); |
1713 | hdr = ipv6_hdr(skb); |
1714 | |
1715 | ip6_flow_hdr(hdr, tclass: 0, flowlabel: 0); |
1716 | |
1717 | hdr->payload_len = htons(len); |
1718 | hdr->nexthdr = proto; |
1719 | hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit); |
1720 | |
1721 | hdr->saddr = *saddr; |
1722 | hdr->daddr = *daddr; |
1723 | } |
1724 | |
1725 | static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) |
1726 | { |
1727 | u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, |
1728 | 2, 0, 0, IPV6_TLV_PADN, 0 }; |
1729 | struct net_device *dev = idev->dev; |
1730 | int hlen = LL_RESERVED_SPACE(dev); |
1731 | int tlen = dev->needed_tailroom; |
1732 | struct net *net = dev_net(dev); |
1733 | const struct in6_addr *saddr; |
1734 | struct in6_addr addr_buf; |
1735 | struct mld2_report *pmr; |
1736 | struct sk_buff *skb; |
1737 | unsigned int size; |
1738 | struct sock *sk; |
1739 | int err; |
1740 | |
1741 | sk = net->ipv6.igmp_sk; |
1742 | /* we assume size > sizeof(ra) here |
1743 | * Also try to not allocate high-order pages for big MTU |
1744 | */ |
1745 | size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen; |
1746 | skb = sock_alloc_send_skb(sk, size, noblock: 1, errcode: &err); |
1747 | if (!skb) |
1748 | return NULL; |
1749 | |
1750 | skb->priority = TC_PRIO_CONTROL; |
1751 | skb_reserve(skb, len: hlen); |
1752 | skb_tailroom_reserve(skb, mtu, needed_tailroom: tlen); |
1753 | |
1754 | if (ipv6_get_lladdr(dev, addr: &addr_buf, IFA_F_TENTATIVE)) { |
1755 | /* <draft-ietf-magma-mld-source-05.txt>: |
1756 | * use unspecified address as the source address |
1757 | * when a valid link-local address is not available. |
1758 | */ |
1759 | saddr = &in6addr_any; |
1760 | } else |
1761 | saddr = &addr_buf; |
1762 | |
1763 | ip6_mc_hdr(sk, skb, dev, saddr, daddr: &mld2_all_mcr, NEXTHDR_HOP, len: 0); |
1764 | |
1765 | skb_put_data(skb, data: ra, len: sizeof(ra)); |
1766 | |
1767 | skb_set_transport_header(skb, offset: skb_tail_pointer(skb) - skb->data); |
1768 | skb_put(skb, len: sizeof(*pmr)); |
1769 | pmr = (struct mld2_report *)skb_transport_header(skb); |
1770 | pmr->mld2r_type = ICMPV6_MLD2_REPORT; |
1771 | pmr->mld2r_resv1 = 0; |
1772 | pmr->mld2r_cksum = 0; |
1773 | pmr->mld2r_resv2 = 0; |
1774 | pmr->mld2r_ngrec = 0; |
1775 | return skb; |
1776 | } |
1777 | |
1778 | static void mld_sendpack(struct sk_buff *skb) |
1779 | { |
1780 | struct ipv6hdr *pip6 = ipv6_hdr(skb); |
1781 | struct mld2_report *pmr = |
1782 | (struct mld2_report *)skb_transport_header(skb); |
1783 | int payload_len, mldlen; |
1784 | struct inet6_dev *idev; |
1785 | struct net *net = dev_net(dev: skb->dev); |
1786 | int err; |
1787 | struct flowi6 fl6; |
1788 | struct dst_entry *dst; |
1789 | |
1790 | rcu_read_lock(); |
1791 | idev = __in6_dev_get(dev: skb->dev); |
1792 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS); |
1793 | |
1794 | payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - |
1795 | sizeof(*pip6); |
1796 | mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1797 | pip6->payload_len = htons(payload_len); |
1798 | |
1799 | pmr->mld2r_cksum = csum_ipv6_magic(saddr: &pip6->saddr, daddr: &pip6->daddr, len: mldlen, |
1800 | IPPROTO_ICMPV6, |
1801 | sum: csum_partial(buff: skb_transport_header(skb), |
1802 | len: mldlen, sum: 0)); |
1803 | |
1804 | icmpv6_flow_init(sk: net->ipv6.igmp_sk, fl6: &fl6, ICMPV6_MLD2_REPORT, |
1805 | saddr: &ipv6_hdr(skb)->saddr, daddr: &ipv6_hdr(skb)->daddr, |
1806 | oif: skb->dev->ifindex); |
1807 | dst = icmp6_dst_alloc(dev: skb->dev, fl6: &fl6); |
1808 | |
1809 | err = 0; |
1810 | if (IS_ERR(ptr: dst)) { |
1811 | err = PTR_ERR(ptr: dst); |
1812 | dst = NULL; |
1813 | } |
1814 | skb_dst_set(skb, dst); |
1815 | if (err) |
1816 | goto err_out; |
1817 | |
1818 | err = NF_HOOK(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_OUT, |
1819 | net, sk: net->ipv6.igmp_sk, skb, NULL, out: skb->dev, |
1820 | okfn: dst_output); |
1821 | out: |
1822 | if (!err) { |
1823 | ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); |
1824 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1825 | } else { |
1826 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
1827 | } |
1828 | |
1829 | rcu_read_unlock(); |
1830 | return; |
1831 | |
1832 | err_out: |
1833 | kfree_skb(skb); |
1834 | goto out; |
1835 | } |
1836 | |
1837 | static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) |
1838 | { |
1839 | return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdeleted: gdel,sdeleted: sdel); |
1840 | } |
1841 | |
1842 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
1843 | int type, struct mld2_grec **ppgr, unsigned int mtu) |
1844 | { |
1845 | struct mld2_report *pmr; |
1846 | struct mld2_grec *pgr; |
1847 | |
1848 | if (!skb) { |
1849 | skb = mld_newpack(idev: pmc->idev, mtu); |
1850 | if (!skb) |
1851 | return NULL; |
1852 | } |
1853 | pgr = skb_put(skb, len: sizeof(struct mld2_grec)); |
1854 | pgr->grec_type = type; |
1855 | pgr->grec_auxwords = 0; |
1856 | pgr->grec_nsrcs = 0; |
1857 | pgr->grec_mca = pmc->mca_addr; /* structure copy */ |
1858 | pmr = (struct mld2_report *)skb_transport_header(skb); |
1859 | pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); |
1860 | *ppgr = pgr; |
1861 | return skb; |
1862 | } |
1863 | |
1864 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1865 | |
1866 | /* called with mc_lock */ |
1867 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
1868 | int type, int gdeleted, int sdeleted, |
1869 | int crsend) |
1870 | { |
1871 | struct ip6_sf_list *psf, *psf_prev, *psf_next; |
1872 | int scount, stotal, first, isquery, truncate; |
1873 | struct ip6_sf_list __rcu **psf_list; |
1874 | struct inet6_dev *idev = pmc->idev; |
1875 | struct net_device *dev = idev->dev; |
1876 | struct mld2_grec *pgr = NULL; |
1877 | struct mld2_report *pmr; |
1878 | unsigned int mtu; |
1879 | |
1880 | if (pmc->mca_flags & MAF_NOREPORT) |
1881 | return skb; |
1882 | |
1883 | mtu = READ_ONCE(dev->mtu); |
1884 | if (mtu < IPV6_MIN_MTU) |
1885 | return skb; |
1886 | |
1887 | isquery = type == MLD2_MODE_IS_INCLUDE || |
1888 | type == MLD2_MODE_IS_EXCLUDE; |
1889 | truncate = type == MLD2_MODE_IS_EXCLUDE || |
1890 | type == MLD2_CHANGE_TO_EXCLUDE; |
1891 | |
1892 | stotal = scount = 0; |
1893 | |
1894 | psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; |
1895 | |
1896 | if (!rcu_access_pointer(*psf_list)) |
1897 | goto empty_source; |
1898 | |
1899 | pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; |
1900 | |
1901 | /* EX and TO_EX get a fresh packet, if needed */ |
1902 | if (truncate) { |
1903 | if (pmr && pmr->mld2r_ngrec && |
1904 | AVAILABLE(skb) < grec_size(pmc, type, gdel: gdeleted, sdel: sdeleted)) { |
1905 | if (skb) |
1906 | mld_sendpack(skb); |
1907 | skb = mld_newpack(idev, mtu); |
1908 | } |
1909 | } |
1910 | first = 1; |
1911 | psf_prev = NULL; |
1912 | for (psf = mc_dereference(*psf_list, idev); |
1913 | psf; |
1914 | psf = psf_next) { |
1915 | struct in6_addr *psrc; |
1916 | |
1917 | psf_next = mc_dereference(psf->sf_next, idev); |
1918 | |
1919 | if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { |
1920 | psf_prev = psf; |
1921 | continue; |
1922 | } |
1923 | |
1924 | /* Based on RFC3810 6.1. Should not send source-list change |
1925 | * records when there is a filter mode change. |
1926 | */ |
1927 | if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || |
1928 | (!gdeleted && pmc->mca_crcount)) && |
1929 | (type == MLD2_ALLOW_NEW_SOURCES || |
1930 | type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) |
1931 | goto decrease_sf_crcount; |
1932 | |
1933 | /* clear marks on query responses */ |
1934 | if (isquery) |
1935 | psf->sf_gsresp = 0; |
1936 | |
1937 | if (AVAILABLE(skb) < sizeof(*psrc) + |
1938 | first*sizeof(struct mld2_grec)) { |
1939 | if (truncate && !first) |
1940 | break; /* truncate these */ |
1941 | if (pgr) |
1942 | pgr->grec_nsrcs = htons(scount); |
1943 | if (skb) |
1944 | mld_sendpack(skb); |
1945 | skb = mld_newpack(idev, mtu); |
1946 | first = 1; |
1947 | scount = 0; |
1948 | } |
1949 | if (first) { |
1950 | skb = add_grhead(skb, pmc, type, ppgr: &pgr, mtu); |
1951 | first = 0; |
1952 | } |
1953 | if (!skb) |
1954 | return NULL; |
1955 | psrc = skb_put(skb, len: sizeof(*psrc)); |
1956 | *psrc = psf->sf_addr; |
1957 | scount++; stotal++; |
1958 | if ((type == MLD2_ALLOW_NEW_SOURCES || |
1959 | type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { |
1960 | decrease_sf_crcount: |
1961 | psf->sf_crcount--; |
1962 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { |
1963 | if (psf_prev) |
1964 | rcu_assign_pointer(psf_prev->sf_next, |
1965 | mc_dereference(psf->sf_next, idev)); |
1966 | else |
1967 | rcu_assign_pointer(*psf_list, |
1968 | mc_dereference(psf->sf_next, idev)); |
1969 | kfree_rcu(psf, rcu); |
1970 | continue; |
1971 | } |
1972 | } |
1973 | psf_prev = psf; |
1974 | } |
1975 | |
1976 | empty_source: |
1977 | if (!stotal) { |
1978 | if (type == MLD2_ALLOW_NEW_SOURCES || |
1979 | type == MLD2_BLOCK_OLD_SOURCES) |
1980 | return skb; |
1981 | if (pmc->mca_crcount || isquery || crsend) { |
1982 | /* make sure we have room for group header */ |
1983 | if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { |
1984 | mld_sendpack(skb); |
1985 | skb = NULL; /* add_grhead will get a new one */ |
1986 | } |
1987 | skb = add_grhead(skb, pmc, type, ppgr: &pgr, mtu); |
1988 | } |
1989 | } |
1990 | if (pgr) |
1991 | pgr->grec_nsrcs = htons(scount); |
1992 | |
1993 | if (isquery) |
1994 | pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ |
1995 | return skb; |
1996 | } |
1997 | |
1998 | /* called with mc_lock */ |
1999 | static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) |
2000 | { |
2001 | struct sk_buff *skb = NULL; |
2002 | int type; |
2003 | |
2004 | if (!pmc) { |
2005 | for_each_mc_mclock(idev, pmc) { |
2006 | if (pmc->mca_flags & MAF_NOREPORT) |
2007 | continue; |
2008 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
2009 | type = MLD2_MODE_IS_EXCLUDE; |
2010 | else |
2011 | type = MLD2_MODE_IS_INCLUDE; |
2012 | skb = add_grec(skb, pmc, type, gdeleted: 0, sdeleted: 0, crsend: 0); |
2013 | } |
2014 | } else { |
2015 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
2016 | type = MLD2_MODE_IS_EXCLUDE; |
2017 | else |
2018 | type = MLD2_MODE_IS_INCLUDE; |
2019 | skb = add_grec(skb, pmc, type, gdeleted: 0, sdeleted: 0, crsend: 0); |
2020 | } |
2021 | if (skb) |
2022 | mld_sendpack(skb); |
2023 | } |
2024 | |
2025 | /* |
2026 | * remove zero-count source records from a source filter list |
2027 | * called with mc_lock |
2028 | */ |
2029 | static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev) |
2030 | { |
2031 | struct ip6_sf_list *psf_prev, *psf_next, *psf; |
2032 | |
2033 | psf_prev = NULL; |
2034 | for (psf = mc_dereference(*ppsf, idev); |
2035 | psf; |
2036 | psf = psf_next) { |
2037 | psf_next = mc_dereference(psf->sf_next, idev); |
2038 | if (psf->sf_crcount == 0) { |
2039 | if (psf_prev) |
2040 | rcu_assign_pointer(psf_prev->sf_next, |
2041 | mc_dereference(psf->sf_next, idev)); |
2042 | else |
2043 | rcu_assign_pointer(*ppsf, |
2044 | mc_dereference(psf->sf_next, idev)); |
2045 | kfree_rcu(psf, rcu); |
2046 | } else { |
2047 | psf_prev = psf; |
2048 | } |
2049 | } |
2050 | } |
2051 | |
2052 | /* called with mc_lock */ |
2053 | static void mld_send_cr(struct inet6_dev *idev) |
2054 | { |
2055 | struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; |
2056 | struct sk_buff *skb = NULL; |
2057 | int type, dtype; |
2058 | |
2059 | /* deleted MCA's */ |
2060 | pmc_prev = NULL; |
2061 | for (pmc = mc_dereference(idev->mc_tomb, idev); |
2062 | pmc; |
2063 | pmc = pmc_next) { |
2064 | pmc_next = mc_dereference(pmc->next, idev); |
2065 | if (pmc->mca_sfmode == MCAST_INCLUDE) { |
2066 | type = MLD2_BLOCK_OLD_SOURCES; |
2067 | dtype = MLD2_BLOCK_OLD_SOURCES; |
2068 | skb = add_grec(skb, pmc, type, gdeleted: 1, sdeleted: 0, crsend: 0); |
2069 | skb = add_grec(skb, pmc, type: dtype, gdeleted: 1, sdeleted: 1, crsend: 0); |
2070 | } |
2071 | if (pmc->mca_crcount) { |
2072 | if (pmc->mca_sfmode == MCAST_EXCLUDE) { |
2073 | type = MLD2_CHANGE_TO_INCLUDE; |
2074 | skb = add_grec(skb, pmc, type, gdeleted: 1, sdeleted: 0, crsend: 0); |
2075 | } |
2076 | pmc->mca_crcount--; |
2077 | if (pmc->mca_crcount == 0) { |
2078 | mld_clear_zeros(ppsf: &pmc->mca_tomb, idev); |
2079 | mld_clear_zeros(ppsf: &pmc->mca_sources, idev); |
2080 | } |
2081 | } |
2082 | if (pmc->mca_crcount == 0 && |
2083 | !rcu_access_pointer(pmc->mca_tomb) && |
2084 | !rcu_access_pointer(pmc->mca_sources)) { |
2085 | if (pmc_prev) |
2086 | rcu_assign_pointer(pmc_prev->next, pmc_next); |
2087 | else |
2088 | rcu_assign_pointer(idev->mc_tomb, pmc_next); |
2089 | in6_dev_put(idev: pmc->idev); |
2090 | kfree_rcu(pmc, rcu); |
2091 | } else |
2092 | pmc_prev = pmc; |
2093 | } |
2094 | |
2095 | /* change recs */ |
2096 | for_each_mc_mclock(idev, pmc) { |
2097 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
2098 | type = MLD2_BLOCK_OLD_SOURCES; |
2099 | dtype = MLD2_ALLOW_NEW_SOURCES; |
2100 | } else { |
2101 | type = MLD2_ALLOW_NEW_SOURCES; |
2102 | dtype = MLD2_BLOCK_OLD_SOURCES; |
2103 | } |
2104 | skb = add_grec(skb, pmc, type, gdeleted: 0, sdeleted: 0, crsend: 0); |
2105 | skb = add_grec(skb, pmc, type: dtype, gdeleted: 0, sdeleted: 1, crsend: 0); /* deleted sources */ |
2106 | |
2107 | /* filter mode changes */ |
2108 | if (pmc->mca_crcount) { |
2109 | if (pmc->mca_sfmode == MCAST_EXCLUDE) |
2110 | type = MLD2_CHANGE_TO_EXCLUDE; |
2111 | else |
2112 | type = MLD2_CHANGE_TO_INCLUDE; |
2113 | skb = add_grec(skb, pmc, type, gdeleted: 0, sdeleted: 0, crsend: 0); |
2114 | pmc->mca_crcount--; |
2115 | } |
2116 | } |
2117 | if (!skb) |
2118 | return; |
2119 | (void) mld_sendpack(skb); |
2120 | } |
2121 | |
2122 | static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) |
2123 | { |
2124 | struct net *net = dev_net(dev); |
2125 | struct sock *sk = net->ipv6.igmp_sk; |
2126 | struct inet6_dev *idev; |
2127 | struct sk_buff *skb; |
2128 | struct mld_msg *hdr; |
2129 | const struct in6_addr *snd_addr, *saddr; |
2130 | struct in6_addr addr_buf; |
2131 | int hlen = LL_RESERVED_SPACE(dev); |
2132 | int tlen = dev->needed_tailroom; |
2133 | int err, len, payload_len, full_len; |
2134 | u8 ra[8] = { IPPROTO_ICMPV6, 0, |
2135 | IPV6_TLV_ROUTERALERT, 2, 0, 0, |
2136 | IPV6_TLV_PADN, 0 }; |
2137 | struct flowi6 fl6; |
2138 | struct dst_entry *dst; |
2139 | |
2140 | if (type == ICMPV6_MGM_REDUCTION) |
2141 | snd_addr = &in6addr_linklocal_allrouters; |
2142 | else |
2143 | snd_addr = addr; |
2144 | |
2145 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); |
2146 | payload_len = len + sizeof(ra); |
2147 | full_len = sizeof(struct ipv6hdr) + payload_len; |
2148 | |
2149 | rcu_read_lock(); |
2150 | IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_OUTREQUESTS); |
2151 | rcu_read_unlock(); |
2152 | |
2153 | skb = sock_alloc_send_skb(sk, size: hlen + tlen + full_len, noblock: 1, errcode: &err); |
2154 | |
2155 | if (!skb) { |
2156 | rcu_read_lock(); |
2157 | IP6_INC_STATS(net, __in6_dev_get(dev), |
2158 | IPSTATS_MIB_OUTDISCARDS); |
2159 | rcu_read_unlock(); |
2160 | return; |
2161 | } |
2162 | skb->priority = TC_PRIO_CONTROL; |
2163 | skb_reserve(skb, len: hlen); |
2164 | |
2165 | if (ipv6_get_lladdr(dev, addr: &addr_buf, IFA_F_TENTATIVE)) { |
2166 | /* <draft-ietf-magma-mld-source-05.txt>: |
2167 | * use unspecified address as the source address |
2168 | * when a valid link-local address is not available. |
2169 | */ |
2170 | saddr = &in6addr_any; |
2171 | } else |
2172 | saddr = &addr_buf; |
2173 | |
2174 | ip6_mc_hdr(sk, skb, dev, saddr, daddr: snd_addr, NEXTHDR_HOP, len: payload_len); |
2175 | |
2176 | skb_put_data(skb, data: ra, len: sizeof(ra)); |
2177 | |
2178 | hdr = skb_put_zero(skb, len: sizeof(struct mld_msg)); |
2179 | hdr->mld_type = type; |
2180 | hdr->mld_mca = *addr; |
2181 | |
2182 | hdr->mld_cksum = csum_ipv6_magic(saddr, daddr: snd_addr, len, |
2183 | IPPROTO_ICMPV6, |
2184 | sum: csum_partial(buff: hdr, len, sum: 0)); |
2185 | |
2186 | rcu_read_lock(); |
2187 | idev = __in6_dev_get(dev: skb->dev); |
2188 | |
2189 | icmpv6_flow_init(sk, fl6: &fl6, type, |
2190 | saddr: &ipv6_hdr(skb)->saddr, daddr: &ipv6_hdr(skb)->daddr, |
2191 | oif: skb->dev->ifindex); |
2192 | dst = icmp6_dst_alloc(dev: skb->dev, fl6: &fl6); |
2193 | if (IS_ERR(ptr: dst)) { |
2194 | err = PTR_ERR(ptr: dst); |
2195 | goto err_out; |
2196 | } |
2197 | |
2198 | skb_dst_set(skb, dst); |
2199 | err = NF_HOOK(pf: NFPROTO_IPV6, hook: NF_INET_LOCAL_OUT, |
2200 | net, sk, skb, NULL, out: skb->dev, |
2201 | okfn: dst_output); |
2202 | out: |
2203 | if (!err) { |
2204 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
2205 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
2206 | } else |
2207 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
2208 | |
2209 | rcu_read_unlock(); |
2210 | return; |
2211 | |
2212 | err_out: |
2213 | kfree_skb(skb); |
2214 | goto out; |
2215 | } |
2216 | |
2217 | /* called with mc_lock */ |
2218 | static void mld_send_initial_cr(struct inet6_dev *idev) |
2219 | { |
2220 | struct sk_buff *skb; |
2221 | struct ifmcaddr6 *pmc; |
2222 | int type; |
2223 | |
2224 | if (mld_in_v1_mode(idev)) |
2225 | return; |
2226 | |
2227 | skb = NULL; |
2228 | for_each_mc_mclock(idev, pmc) { |
2229 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
2230 | type = MLD2_CHANGE_TO_EXCLUDE; |
2231 | else |
2232 | type = MLD2_ALLOW_NEW_SOURCES; |
2233 | skb = add_grec(skb, pmc, type, gdeleted: 0, sdeleted: 0, crsend: 1); |
2234 | } |
2235 | if (skb) |
2236 | mld_sendpack(skb); |
2237 | } |
2238 | |
2239 | void ipv6_mc_dad_complete(struct inet6_dev *idev) |
2240 | { |
2241 | mutex_lock(&idev->mc_lock); |
2242 | idev->mc_dad_count = idev->mc_qrv; |
2243 | if (idev->mc_dad_count) { |
2244 | mld_send_initial_cr(idev); |
2245 | idev->mc_dad_count--; |
2246 | if (idev->mc_dad_count) |
2247 | mld_dad_start_work(idev, |
2248 | delay: unsolicited_report_interval(idev)); |
2249 | } |
2250 | mutex_unlock(lock: &idev->mc_lock); |
2251 | } |
2252 | |
2253 | static void mld_dad_work(struct work_struct *work) |
2254 | { |
2255 | struct inet6_dev *idev = container_of(to_delayed_work(work), |
2256 | struct inet6_dev, |
2257 | mc_dad_work); |
2258 | mutex_lock(&idev->mc_lock); |
2259 | mld_send_initial_cr(idev); |
2260 | if (idev->mc_dad_count) { |
2261 | idev->mc_dad_count--; |
2262 | if (idev->mc_dad_count) |
2263 | mld_dad_start_work(idev, |
2264 | delay: unsolicited_report_interval(idev)); |
2265 | } |
2266 | mutex_unlock(lock: &idev->mc_lock); |
2267 | in6_dev_put(idev); |
2268 | } |
2269 | |
2270 | /* called with mc_lock */ |
2271 | static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, |
2272 | const struct in6_addr *psfsrc) |
2273 | { |
2274 | struct ip6_sf_list *psf, *psf_prev; |
2275 | int rv = 0; |
2276 | |
2277 | psf_prev = NULL; |
2278 | for_each_psf_mclock(pmc, psf) { |
2279 | if (ipv6_addr_equal(a1: &psf->sf_addr, a2: psfsrc)) |
2280 | break; |
2281 | psf_prev = psf; |
2282 | } |
2283 | if (!psf || psf->sf_count[sfmode] == 0) { |
2284 | /* source filter not found, or count wrong => bug */ |
2285 | return -ESRCH; |
2286 | } |
2287 | psf->sf_count[sfmode]--; |
2288 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { |
2289 | struct inet6_dev *idev = pmc->idev; |
2290 | |
2291 | /* no more filters for this source */ |
2292 | if (psf_prev) |
2293 | rcu_assign_pointer(psf_prev->sf_next, |
2294 | mc_dereference(psf->sf_next, idev)); |
2295 | else |
2296 | rcu_assign_pointer(pmc->mca_sources, |
2297 | mc_dereference(psf->sf_next, idev)); |
2298 | |
2299 | if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && |
2300 | !mld_in_v1_mode(idev)) { |
2301 | psf->sf_crcount = idev->mc_qrv; |
2302 | rcu_assign_pointer(psf->sf_next, |
2303 | mc_dereference(pmc->mca_tomb, idev)); |
2304 | rcu_assign_pointer(pmc->mca_tomb, psf); |
2305 | rv = 1; |
2306 | } else { |
2307 | kfree_rcu(psf, rcu); |
2308 | } |
2309 | } |
2310 | return rv; |
2311 | } |
2312 | |
2313 | /* called with mc_lock */ |
2314 | static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
2315 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
2316 | int delta) |
2317 | { |
2318 | struct ifmcaddr6 *pmc; |
2319 | int changerec = 0; |
2320 | int i, err; |
2321 | |
2322 | if (!idev) |
2323 | return -ENODEV; |
2324 | |
2325 | for_each_mc_mclock(idev, pmc) { |
2326 | if (ipv6_addr_equal(a1: pmca, a2: &pmc->mca_addr)) |
2327 | break; |
2328 | } |
2329 | if (!pmc) |
2330 | return -ESRCH; |
2331 | |
2332 | sf_markstate(pmc); |
2333 | if (!delta) { |
2334 | if (!pmc->mca_sfcount[sfmode]) |
2335 | return -EINVAL; |
2336 | |
2337 | pmc->mca_sfcount[sfmode]--; |
2338 | } |
2339 | err = 0; |
2340 | for (i = 0; i < sfcount; i++) { |
2341 | int rv = ip6_mc_del1_src(pmc, sfmode, psfsrc: &psfsrc[i]); |
2342 | |
2343 | changerec |= rv > 0; |
2344 | if (!err && rv < 0) |
2345 | err = rv; |
2346 | } |
2347 | if (pmc->mca_sfmode == MCAST_EXCLUDE && |
2348 | pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && |
2349 | pmc->mca_sfcount[MCAST_INCLUDE]) { |
2350 | struct ip6_sf_list *psf; |
2351 | |
2352 | /* filter mode change */ |
2353 | pmc->mca_sfmode = MCAST_INCLUDE; |
2354 | pmc->mca_crcount = idev->mc_qrv; |
2355 | idev->mc_ifc_count = pmc->mca_crcount; |
2356 | for_each_psf_mclock(pmc, psf) |
2357 | psf->sf_crcount = 0; |
2358 | mld_ifc_event(idev: pmc->idev); |
2359 | } else if (sf_setstate(pmc) || changerec) { |
2360 | mld_ifc_event(idev: pmc->idev); |
2361 | } |
2362 | |
2363 | return err; |
2364 | } |
2365 | |
2366 | /* |
2367 | * Add multicast single-source filter to the interface list |
2368 | * called with mc_lock |
2369 | */ |
2370 | static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, |
2371 | const struct in6_addr *psfsrc) |
2372 | { |
2373 | struct ip6_sf_list *psf, *psf_prev; |
2374 | |
2375 | psf_prev = NULL; |
2376 | for_each_psf_mclock(pmc, psf) { |
2377 | if (ipv6_addr_equal(a1: &psf->sf_addr, a2: psfsrc)) |
2378 | break; |
2379 | psf_prev = psf; |
2380 | } |
2381 | if (!psf) { |
2382 | psf = kzalloc(size: sizeof(*psf), GFP_KERNEL); |
2383 | if (!psf) |
2384 | return -ENOBUFS; |
2385 | |
2386 | psf->sf_addr = *psfsrc; |
2387 | if (psf_prev) { |
2388 | rcu_assign_pointer(psf_prev->sf_next, psf); |
2389 | } else { |
2390 | rcu_assign_pointer(pmc->mca_sources, psf); |
2391 | } |
2392 | } |
2393 | psf->sf_count[sfmode]++; |
2394 | return 0; |
2395 | } |
2396 | |
2397 | /* called with mc_lock */ |
2398 | static void sf_markstate(struct ifmcaddr6 *pmc) |
2399 | { |
2400 | struct ip6_sf_list *psf; |
2401 | int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; |
2402 | |
2403 | for_each_psf_mclock(pmc, psf) { |
2404 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
2405 | psf->sf_oldin = mca_xcount == |
2406 | psf->sf_count[MCAST_EXCLUDE] && |
2407 | !psf->sf_count[MCAST_INCLUDE]; |
2408 | } else { |
2409 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; |
2410 | } |
2411 | } |
2412 | } |
2413 | |
2414 | /* called with mc_lock */ |
2415 | static int sf_setstate(struct ifmcaddr6 *pmc) |
2416 | { |
2417 | struct ip6_sf_list *psf, *dpsf; |
2418 | int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; |
2419 | int qrv = pmc->idev->mc_qrv; |
2420 | int new_in, rv; |
2421 | |
2422 | rv = 0; |
2423 | for_each_psf_mclock(pmc, psf) { |
2424 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
2425 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && |
2426 | !psf->sf_count[MCAST_INCLUDE]; |
2427 | } else |
2428 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; |
2429 | if (new_in) { |
2430 | if (!psf->sf_oldin) { |
2431 | struct ip6_sf_list *prev = NULL; |
2432 | |
2433 | for_each_psf_tomb(pmc, dpsf) { |
2434 | if (ipv6_addr_equal(a1: &dpsf->sf_addr, |
2435 | a2: &psf->sf_addr)) |
2436 | break; |
2437 | prev = dpsf; |
2438 | } |
2439 | if (dpsf) { |
2440 | if (prev) |
2441 | rcu_assign_pointer(prev->sf_next, |
2442 | mc_dereference(dpsf->sf_next, |
2443 | pmc->idev)); |
2444 | else |
2445 | rcu_assign_pointer(pmc->mca_tomb, |
2446 | mc_dereference(dpsf->sf_next, |
2447 | pmc->idev)); |
2448 | kfree_rcu(dpsf, rcu); |
2449 | } |
2450 | psf->sf_crcount = qrv; |
2451 | rv++; |
2452 | } |
2453 | } else if (psf->sf_oldin) { |
2454 | psf->sf_crcount = 0; |
2455 | /* |
2456 | * add or update "delete" records if an active filter |
2457 | * is now inactive |
2458 | */ |
2459 | |
2460 | for_each_psf_tomb(pmc, dpsf) |
2461 | if (ipv6_addr_equal(a1: &dpsf->sf_addr, |
2462 | a2: &psf->sf_addr)) |
2463 | break; |
2464 | if (!dpsf) { |
2465 | dpsf = kmalloc(size: sizeof(*dpsf), GFP_KERNEL); |
2466 | if (!dpsf) |
2467 | continue; |
2468 | *dpsf = *psf; |
2469 | rcu_assign_pointer(dpsf->sf_next, |
2470 | mc_dereference(pmc->mca_tomb, pmc->idev)); |
2471 | rcu_assign_pointer(pmc->mca_tomb, dpsf); |
2472 | } |
2473 | dpsf->sf_crcount = qrv; |
2474 | rv++; |
2475 | } |
2476 | } |
2477 | return rv; |
2478 | } |
2479 | |
2480 | /* |
2481 | * Add multicast source filter list to the interface list |
2482 | * called with mc_lock |
2483 | */ |
2484 | static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
2485 | int sfmode, int sfcount, const struct in6_addr *psfsrc, |
2486 | int delta) |
2487 | { |
2488 | struct ifmcaddr6 *pmc; |
2489 | int isexclude; |
2490 | int i, err; |
2491 | |
2492 | if (!idev) |
2493 | return -ENODEV; |
2494 | |
2495 | for_each_mc_mclock(idev, pmc) { |
2496 | if (ipv6_addr_equal(a1: pmca, a2: &pmc->mca_addr)) |
2497 | break; |
2498 | } |
2499 | if (!pmc) |
2500 | return -ESRCH; |
2501 | |
2502 | sf_markstate(pmc); |
2503 | isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; |
2504 | if (!delta) |
2505 | pmc->mca_sfcount[sfmode]++; |
2506 | err = 0; |
2507 | for (i = 0; i < sfcount; i++) { |
2508 | err = ip6_mc_add1_src(pmc, sfmode, psfsrc: &psfsrc[i]); |
2509 | if (err) |
2510 | break; |
2511 | } |
2512 | if (err) { |
2513 | int j; |
2514 | |
2515 | if (!delta) |
2516 | pmc->mca_sfcount[sfmode]--; |
2517 | for (j = 0; j < i; j++) |
2518 | ip6_mc_del1_src(pmc, sfmode, psfsrc: &psfsrc[j]); |
2519 | } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { |
2520 | struct ip6_sf_list *psf; |
2521 | |
2522 | /* filter mode change */ |
2523 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
2524 | pmc->mca_sfmode = MCAST_EXCLUDE; |
2525 | else if (pmc->mca_sfcount[MCAST_INCLUDE]) |
2526 | pmc->mca_sfmode = MCAST_INCLUDE; |
2527 | /* else no filters; keep old mode for reports */ |
2528 | |
2529 | pmc->mca_crcount = idev->mc_qrv; |
2530 | idev->mc_ifc_count = pmc->mca_crcount; |
2531 | for_each_psf_mclock(pmc, psf) |
2532 | psf->sf_crcount = 0; |
2533 | mld_ifc_event(idev); |
2534 | } else if (sf_setstate(pmc)) { |
2535 | mld_ifc_event(idev); |
2536 | } |
2537 | return err; |
2538 | } |
2539 | |
2540 | /* called with mc_lock */ |
2541 | static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) |
2542 | { |
2543 | struct ip6_sf_list *psf, *nextpsf; |
2544 | |
2545 | for (psf = mc_dereference(pmc->mca_tomb, pmc->idev); |
2546 | psf; |
2547 | psf = nextpsf) { |
2548 | nextpsf = mc_dereference(psf->sf_next, pmc->idev); |
2549 | kfree_rcu(psf, rcu); |
2550 | } |
2551 | RCU_INIT_POINTER(pmc->mca_tomb, NULL); |
2552 | for (psf = mc_dereference(pmc->mca_sources, pmc->idev); |
2553 | psf; |
2554 | psf = nextpsf) { |
2555 | nextpsf = mc_dereference(psf->sf_next, pmc->idev); |
2556 | kfree_rcu(psf, rcu); |
2557 | } |
2558 | RCU_INIT_POINTER(pmc->mca_sources, NULL); |
2559 | pmc->mca_sfmode = MCAST_EXCLUDE; |
2560 | pmc->mca_sfcount[MCAST_INCLUDE] = 0; |
2561 | pmc->mca_sfcount[MCAST_EXCLUDE] = 1; |
2562 | } |
2563 | |
2564 | /* called with mc_lock */ |
2565 | static void igmp6_join_group(struct ifmcaddr6 *ma) |
2566 | { |
2567 | unsigned long delay; |
2568 | |
2569 | if (ma->mca_flags & MAF_NOREPORT) |
2570 | return; |
2571 | |
2572 | igmp6_send(addr: &ma->mca_addr, dev: ma->idev->dev, ICMPV6_MGM_REPORT); |
2573 | |
2574 | delay = get_random_u32_below(ceil: unsolicited_report_interval(idev: ma->idev)); |
2575 | |
2576 | if (cancel_delayed_work(dwork: &ma->mca_work)) { |
2577 | refcount_dec(r: &ma->mca_refcnt); |
2578 | delay = ma->mca_work.timer.expires - jiffies; |
2579 | } |
2580 | |
2581 | if (!mod_delayed_work(wq: mld_wq, dwork: &ma->mca_work, delay)) |
2582 | refcount_inc(r: &ma->mca_refcnt); |
2583 | ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; |
2584 | } |
2585 | |
2586 | static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
2587 | struct inet6_dev *idev) |
2588 | { |
2589 | struct ip6_sf_socklist *psl; |
2590 | int err; |
2591 | |
2592 | psl = sock_dereference(iml->sflist, sk); |
2593 | |
2594 | if (idev) |
2595 | mutex_lock(&idev->mc_lock); |
2596 | |
2597 | if (!psl) { |
2598 | /* any-source empty exclude case */ |
2599 | err = ip6_mc_del_src(idev, pmca: &iml->addr, sfmode: iml->sfmode, sfcount: 0, NULL, delta: 0); |
2600 | } else { |
2601 | err = ip6_mc_del_src(idev, pmca: &iml->addr, sfmode: iml->sfmode, |
2602 | sfcount: psl->sl_count, psfsrc: psl->sl_addr, delta: 0); |
2603 | RCU_INIT_POINTER(iml->sflist, NULL); |
2604 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
2605 | v: &sk->sk_omem_alloc); |
2606 | kfree_rcu(psl, rcu); |
2607 | } |
2608 | |
2609 | if (idev) |
2610 | mutex_unlock(lock: &idev->mc_lock); |
2611 | |
2612 | return err; |
2613 | } |
2614 | |
2615 | /* called with mc_lock */ |
2616 | static void igmp6_leave_group(struct ifmcaddr6 *ma) |
2617 | { |
2618 | if (mld_in_v1_mode(idev: ma->idev)) { |
2619 | if (ma->mca_flags & MAF_LAST_REPORTER) { |
2620 | igmp6_send(addr: &ma->mca_addr, dev: ma->idev->dev, |
2621 | ICMPV6_MGM_REDUCTION); |
2622 | } |
2623 | } else { |
2624 | mld_add_delrec(idev: ma->idev, im: ma); |
2625 | mld_ifc_event(idev: ma->idev); |
2626 | } |
2627 | } |
2628 | |
2629 | static void mld_gq_work(struct work_struct *work) |
2630 | { |
2631 | struct inet6_dev *idev = container_of(to_delayed_work(work), |
2632 | struct inet6_dev, |
2633 | mc_gq_work); |
2634 | |
2635 | mutex_lock(&idev->mc_lock); |
2636 | mld_send_report(idev, NULL); |
2637 | idev->mc_gq_running = 0; |
2638 | mutex_unlock(lock: &idev->mc_lock); |
2639 | |
2640 | in6_dev_put(idev); |
2641 | } |
2642 | |
2643 | static void mld_ifc_work(struct work_struct *work) |
2644 | { |
2645 | struct inet6_dev *idev = container_of(to_delayed_work(work), |
2646 | struct inet6_dev, |
2647 | mc_ifc_work); |
2648 | |
2649 | mutex_lock(&idev->mc_lock); |
2650 | mld_send_cr(idev); |
2651 | |
2652 | if (idev->mc_ifc_count) { |
2653 | idev->mc_ifc_count--; |
2654 | if (idev->mc_ifc_count) |
2655 | mld_ifc_start_work(idev, |
2656 | delay: unsolicited_report_interval(idev)); |
2657 | } |
2658 | mutex_unlock(lock: &idev->mc_lock); |
2659 | in6_dev_put(idev); |
2660 | } |
2661 | |
2662 | /* called with mc_lock */ |
2663 | static void mld_ifc_event(struct inet6_dev *idev) |
2664 | { |
2665 | if (mld_in_v1_mode(idev)) |
2666 | return; |
2667 | |
2668 | idev->mc_ifc_count = idev->mc_qrv; |
2669 | mld_ifc_start_work(idev, delay: 1); |
2670 | } |
2671 | |
2672 | static void mld_mca_work(struct work_struct *work) |
2673 | { |
2674 | struct ifmcaddr6 *ma = container_of(to_delayed_work(work), |
2675 | struct ifmcaddr6, mca_work); |
2676 | |
2677 | mutex_lock(&ma->idev->mc_lock); |
2678 | if (mld_in_v1_mode(idev: ma->idev)) |
2679 | igmp6_send(addr: &ma->mca_addr, dev: ma->idev->dev, ICMPV6_MGM_REPORT); |
2680 | else |
2681 | mld_send_report(idev: ma->idev, pmc: ma); |
2682 | ma->mca_flags |= MAF_LAST_REPORTER; |
2683 | ma->mca_flags &= ~MAF_TIMER_RUNNING; |
2684 | mutex_unlock(lock: &ma->idev->mc_lock); |
2685 | |
2686 | ma_put(mc: ma); |
2687 | } |
2688 | |
2689 | /* Device changing type */ |
2690 | |
2691 | void ipv6_mc_unmap(struct inet6_dev *idev) |
2692 | { |
2693 | struct ifmcaddr6 *i; |
2694 | |
2695 | /* Install multicast list, except for all-nodes (already installed) */ |
2696 | |
2697 | mutex_lock(&idev->mc_lock); |
2698 | for_each_mc_mclock(idev, i) |
2699 | igmp6_group_dropped(mc: i); |
2700 | mutex_unlock(lock: &idev->mc_lock); |
2701 | } |
2702 | |
2703 | void ipv6_mc_remap(struct inet6_dev *idev) |
2704 | { |
2705 | ipv6_mc_up(idev); |
2706 | } |
2707 | |
2708 | /* Device going down */ |
2709 | void ipv6_mc_down(struct inet6_dev *idev) |
2710 | { |
2711 | struct ifmcaddr6 *i; |
2712 | |
2713 | mutex_lock(&idev->mc_lock); |
2714 | /* Withdraw multicast list */ |
2715 | for_each_mc_mclock(idev, i) |
2716 | igmp6_group_dropped(mc: i); |
2717 | mutex_unlock(lock: &idev->mc_lock); |
2718 | |
2719 | /* Should stop work after group drop. or we will |
2720 | * start work again in mld_ifc_event() |
2721 | */ |
2722 | synchronize_net(); |
2723 | mld_query_stop_work(idev); |
2724 | mld_report_stop_work(idev); |
2725 | mld_ifc_stop_work(idev); |
2726 | mld_gq_stop_work(idev); |
2727 | mld_dad_stop_work(idev); |
2728 | } |
2729 | |
2730 | static void ipv6_mc_reset(struct inet6_dev *idev) |
2731 | { |
2732 | idev->mc_qrv = sysctl_mld_qrv; |
2733 | idev->mc_qi = MLD_QI_DEFAULT; |
2734 | idev->mc_qri = MLD_QRI_DEFAULT; |
2735 | idev->mc_v1_seen = 0; |
2736 | idev->mc_maxdelay = unsolicited_report_interval(idev); |
2737 | } |
2738 | |
2739 | /* Device going up */ |
2740 | |
2741 | void ipv6_mc_up(struct inet6_dev *idev) |
2742 | { |
2743 | struct ifmcaddr6 *i; |
2744 | |
2745 | /* Install multicast list, except for all-nodes (already installed) */ |
2746 | |
2747 | ipv6_mc_reset(idev); |
2748 | mutex_lock(&idev->mc_lock); |
2749 | for_each_mc_mclock(idev, i) { |
2750 | mld_del_delrec(idev, im: i); |
2751 | igmp6_group_added(mc: i); |
2752 | } |
2753 | mutex_unlock(lock: &idev->mc_lock); |
2754 | } |
2755 | |
2756 | /* IPv6 device initialization. */ |
2757 | |
2758 | void ipv6_mc_init_dev(struct inet6_dev *idev) |
2759 | { |
2760 | idev->mc_gq_running = 0; |
2761 | INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); |
2762 | RCU_INIT_POINTER(idev->mc_tomb, NULL); |
2763 | idev->mc_ifc_count = 0; |
2764 | INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work); |
2765 | INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work); |
2766 | INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work); |
2767 | INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work); |
2768 | skb_queue_head_init(list: &idev->mc_query_queue); |
2769 | skb_queue_head_init(list: &idev->mc_report_queue); |
2770 | spin_lock_init(&idev->mc_query_lock); |
2771 | spin_lock_init(&idev->mc_report_lock); |
2772 | mutex_init(&idev->mc_lock); |
2773 | ipv6_mc_reset(idev); |
2774 | } |
2775 | |
2776 | /* |
2777 | * Device is about to be destroyed: clean up. |
2778 | */ |
2779 | |
2780 | void ipv6_mc_destroy_dev(struct inet6_dev *idev) |
2781 | { |
2782 | struct ifmcaddr6 *i; |
2783 | |
2784 | /* Deactivate works */ |
2785 | ipv6_mc_down(idev); |
2786 | mutex_lock(&idev->mc_lock); |
2787 | mld_clear_delrec(idev); |
2788 | mutex_unlock(lock: &idev->mc_lock); |
2789 | mld_clear_query(idev); |
2790 | mld_clear_report(idev); |
2791 | |
2792 | /* Delete all-nodes address. */ |
2793 | /* We cannot call ipv6_dev_mc_dec() directly, our caller in |
2794 | * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will |
2795 | * fail. |
2796 | */ |
2797 | __ipv6_dev_mc_dec(idev, addr: &in6addr_linklocal_allnodes); |
2798 | |
2799 | if (idev->cnf.forwarding) |
2800 | __ipv6_dev_mc_dec(idev, addr: &in6addr_linklocal_allrouters); |
2801 | |
2802 | mutex_lock(&idev->mc_lock); |
2803 | while ((i = mc_dereference(idev->mc_list, idev))) { |
2804 | rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev)); |
2805 | |
2806 | ip6_mc_clear_src(pmc: i); |
2807 | ma_put(mc: i); |
2808 | } |
2809 | mutex_unlock(lock: &idev->mc_lock); |
2810 | } |
2811 | |
2812 | static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) |
2813 | { |
2814 | struct ifmcaddr6 *pmc; |
2815 | |
2816 | ASSERT_RTNL(); |
2817 | |
2818 | mutex_lock(&idev->mc_lock); |
2819 | if (mld_in_v1_mode(idev)) { |
2820 | for_each_mc_mclock(idev, pmc) |
2821 | igmp6_join_group(ma: pmc); |
2822 | } else { |
2823 | mld_send_report(idev, NULL); |
2824 | } |
2825 | mutex_unlock(lock: &idev->mc_lock); |
2826 | } |
2827 | |
2828 | static int ipv6_mc_netdev_event(struct notifier_block *this, |
2829 | unsigned long event, |
2830 | void *ptr) |
2831 | { |
2832 | struct net_device *dev = netdev_notifier_info_to_dev(info: ptr); |
2833 | struct inet6_dev *idev = __in6_dev_get(dev); |
2834 | |
2835 | switch (event) { |
2836 | case NETDEV_RESEND_IGMP: |
2837 | if (idev) |
2838 | ipv6_mc_rejoin_groups(idev); |
2839 | break; |
2840 | default: |
2841 | break; |
2842 | } |
2843 | |
2844 | return NOTIFY_DONE; |
2845 | } |
2846 | |
2847 | static struct notifier_block igmp6_netdev_notifier = { |
2848 | .notifier_call = ipv6_mc_netdev_event, |
2849 | }; |
2850 | |
2851 | #ifdef CONFIG_PROC_FS |
2852 | struct igmp6_mc_iter_state { |
2853 | struct seq_net_private p; |
2854 | struct net_device *dev; |
2855 | struct inet6_dev *idev; |
2856 | }; |
2857 | |
2858 | #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) |
2859 | |
2860 | static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) |
2861 | { |
2862 | struct ifmcaddr6 *im = NULL; |
2863 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2864 | struct net *net = seq_file_net(seq); |
2865 | |
2866 | state->idev = NULL; |
2867 | for_each_netdev_rcu(net, state->dev) { |
2868 | struct inet6_dev *idev; |
2869 | idev = __in6_dev_get(dev: state->dev); |
2870 | if (!idev) |
2871 | continue; |
2872 | |
2873 | im = rcu_dereference(idev->mc_list); |
2874 | if (im) { |
2875 | state->idev = idev; |
2876 | break; |
2877 | } |
2878 | } |
2879 | return im; |
2880 | } |
2881 | |
2882 | static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) |
2883 | { |
2884 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2885 | |
2886 | im = rcu_dereference(im->next); |
2887 | while (!im) { |
2888 | state->dev = next_net_device_rcu(dev: state->dev); |
2889 | if (!state->dev) { |
2890 | state->idev = NULL; |
2891 | break; |
2892 | } |
2893 | state->idev = __in6_dev_get(dev: state->dev); |
2894 | if (!state->idev) |
2895 | continue; |
2896 | im = rcu_dereference(state->idev->mc_list); |
2897 | } |
2898 | return im; |
2899 | } |
2900 | |
2901 | static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) |
2902 | { |
2903 | struct ifmcaddr6 *im = igmp6_mc_get_first(seq); |
2904 | if (im) |
2905 | while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) |
2906 | --pos; |
2907 | return pos ? NULL : im; |
2908 | } |
2909 | |
2910 | static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) |
2911 | __acquires(RCU) |
2912 | { |
2913 | rcu_read_lock(); |
2914 | return igmp6_mc_get_idx(seq, pos: *pos); |
2915 | } |
2916 | |
2917 | static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
2918 | { |
2919 | struct ifmcaddr6 *im = igmp6_mc_get_next(seq, im: v); |
2920 | |
2921 | ++*pos; |
2922 | return im; |
2923 | } |
2924 | |
2925 | static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) |
2926 | __releases(RCU) |
2927 | { |
2928 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2929 | |
2930 | if (likely(state->idev)) |
2931 | state->idev = NULL; |
2932 | state->dev = NULL; |
2933 | rcu_read_unlock(); |
2934 | } |
2935 | |
2936 | static int igmp6_mc_seq_show(struct seq_file *seq, void *v) |
2937 | { |
2938 | struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; |
2939 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
2940 | |
2941 | seq_printf(m: seq, |
2942 | fmt: "%-4d %-15s %pi6 %5d %08X %ld\n" , |
2943 | state->dev->ifindex, state->dev->name, |
2944 | &im->mca_addr, |
2945 | im->mca_users, im->mca_flags, |
2946 | (im->mca_flags & MAF_TIMER_RUNNING) ? |
2947 | jiffies_to_clock_t(x: im->mca_work.timer.expires - jiffies) : 0); |
2948 | return 0; |
2949 | } |
2950 | |
2951 | static const struct seq_operations igmp6_mc_seq_ops = { |
2952 | .start = igmp6_mc_seq_start, |
2953 | .next = igmp6_mc_seq_next, |
2954 | .stop = igmp6_mc_seq_stop, |
2955 | .show = igmp6_mc_seq_show, |
2956 | }; |
2957 | |
2958 | struct igmp6_mcf_iter_state { |
2959 | struct seq_net_private p; |
2960 | struct net_device *dev; |
2961 | struct inet6_dev *idev; |
2962 | struct ifmcaddr6 *im; |
2963 | }; |
2964 | |
2965 | #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) |
2966 | |
2967 | static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) |
2968 | { |
2969 | struct ip6_sf_list *psf = NULL; |
2970 | struct ifmcaddr6 *im = NULL; |
2971 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
2972 | struct net *net = seq_file_net(seq); |
2973 | |
2974 | state->idev = NULL; |
2975 | state->im = NULL; |
2976 | for_each_netdev_rcu(net, state->dev) { |
2977 | struct inet6_dev *idev; |
2978 | idev = __in6_dev_get(dev: state->dev); |
2979 | if (unlikely(idev == NULL)) |
2980 | continue; |
2981 | |
2982 | im = rcu_dereference(idev->mc_list); |
2983 | if (likely(im)) { |
2984 | psf = rcu_dereference(im->mca_sources); |
2985 | if (likely(psf)) { |
2986 | state->im = im; |
2987 | state->idev = idev; |
2988 | break; |
2989 | } |
2990 | } |
2991 | } |
2992 | return psf; |
2993 | } |
2994 | |
2995 | static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) |
2996 | { |
2997 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
2998 | |
2999 | psf = rcu_dereference(psf->sf_next); |
3000 | while (!psf) { |
3001 | state->im = rcu_dereference(state->im->next); |
3002 | while (!state->im) { |
3003 | state->dev = next_net_device_rcu(dev: state->dev); |
3004 | if (!state->dev) { |
3005 | state->idev = NULL; |
3006 | goto out; |
3007 | } |
3008 | state->idev = __in6_dev_get(dev: state->dev); |
3009 | if (!state->idev) |
3010 | continue; |
3011 | state->im = rcu_dereference(state->idev->mc_list); |
3012 | } |
3013 | psf = rcu_dereference(state->im->mca_sources); |
3014 | } |
3015 | out: |
3016 | return psf; |
3017 | } |
3018 | |
3019 | static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) |
3020 | { |
3021 | struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); |
3022 | if (psf) |
3023 | while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) |
3024 | --pos; |
3025 | return pos ? NULL : psf; |
3026 | } |
3027 | |
3028 | static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) |
3029 | __acquires(RCU) |
3030 | { |
3031 | rcu_read_lock(); |
3032 | return *pos ? igmp6_mcf_get_idx(seq, pos: *pos - 1) : SEQ_START_TOKEN; |
3033 | } |
3034 | |
3035 | static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
3036 | { |
3037 | struct ip6_sf_list *psf; |
3038 | if (v == SEQ_START_TOKEN) |
3039 | psf = igmp6_mcf_get_first(seq); |
3040 | else |
3041 | psf = igmp6_mcf_get_next(seq, psf: v); |
3042 | ++*pos; |
3043 | return psf; |
3044 | } |
3045 | |
3046 | static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) |
3047 | __releases(RCU) |
3048 | { |
3049 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
3050 | |
3051 | if (likely(state->im)) |
3052 | state->im = NULL; |
3053 | if (likely(state->idev)) |
3054 | state->idev = NULL; |
3055 | |
3056 | state->dev = NULL; |
3057 | rcu_read_unlock(); |
3058 | } |
3059 | |
3060 | static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) |
3061 | { |
3062 | struct ip6_sf_list *psf = (struct ip6_sf_list *)v; |
3063 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
3064 | |
3065 | if (v == SEQ_START_TOKEN) { |
3066 | seq_puts(m: seq, s: "Idx Device Multicast Address Source Address INC EXC\n" ); |
3067 | } else { |
3068 | seq_printf(m: seq, |
3069 | fmt: "%3d %6.6s %pi6 %pi6 %6lu %6lu\n" , |
3070 | state->dev->ifindex, state->dev->name, |
3071 | &state->im->mca_addr, |
3072 | &psf->sf_addr, |
3073 | psf->sf_count[MCAST_INCLUDE], |
3074 | psf->sf_count[MCAST_EXCLUDE]); |
3075 | } |
3076 | return 0; |
3077 | } |
3078 | |
3079 | static const struct seq_operations igmp6_mcf_seq_ops = { |
3080 | .start = igmp6_mcf_seq_start, |
3081 | .next = igmp6_mcf_seq_next, |
3082 | .stop = igmp6_mcf_seq_stop, |
3083 | .show = igmp6_mcf_seq_show, |
3084 | }; |
3085 | |
3086 | static int __net_init igmp6_proc_init(struct net *net) |
3087 | { |
3088 | int err; |
3089 | |
3090 | err = -ENOMEM; |
3091 | if (!proc_create_net("igmp6" , 0444, net->proc_net, &igmp6_mc_seq_ops, |
3092 | sizeof(struct igmp6_mc_iter_state))) |
3093 | goto out; |
3094 | if (!proc_create_net("mcfilter6" , 0444, net->proc_net, |
3095 | &igmp6_mcf_seq_ops, |
3096 | sizeof(struct igmp6_mcf_iter_state))) |
3097 | goto out_proc_net_igmp6; |
3098 | |
3099 | err = 0; |
3100 | out: |
3101 | return err; |
3102 | |
3103 | out_proc_net_igmp6: |
3104 | remove_proc_entry("igmp6" , net->proc_net); |
3105 | goto out; |
3106 | } |
3107 | |
3108 | static void __net_exit igmp6_proc_exit(struct net *net) |
3109 | { |
3110 | remove_proc_entry("mcfilter6" , net->proc_net); |
3111 | remove_proc_entry("igmp6" , net->proc_net); |
3112 | } |
3113 | #else |
3114 | static inline int igmp6_proc_init(struct net *net) |
3115 | { |
3116 | return 0; |
3117 | } |
3118 | static inline void igmp6_proc_exit(struct net *net) |
3119 | { |
3120 | } |
3121 | #endif |
3122 | |
3123 | static int __net_init igmp6_net_init(struct net *net) |
3124 | { |
3125 | int err; |
3126 | |
3127 | err = inet_ctl_sock_create(sk: &net->ipv6.igmp_sk, PF_INET6, |
3128 | type: SOCK_RAW, IPPROTO_ICMPV6, net); |
3129 | if (err < 0) { |
3130 | pr_err("Failed to initialize the IGMP6 control socket (err %d)\n" , |
3131 | err); |
3132 | goto out; |
3133 | } |
3134 | |
3135 | inet6_sk(sk: net->ipv6.igmp_sk)->hop_limit = 1; |
3136 | net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL; |
3137 | |
3138 | err = inet_ctl_sock_create(sk: &net->ipv6.mc_autojoin_sk, PF_INET6, |
3139 | type: SOCK_RAW, IPPROTO_ICMPV6, net); |
3140 | if (err < 0) { |
3141 | pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n" , |
3142 | err); |
3143 | goto out_sock_create; |
3144 | } |
3145 | |
3146 | err = igmp6_proc_init(net); |
3147 | if (err) |
3148 | goto out_sock_create_autojoin; |
3149 | |
3150 | return 0; |
3151 | |
3152 | out_sock_create_autojoin: |
3153 | inet_ctl_sock_destroy(sk: net->ipv6.mc_autojoin_sk); |
3154 | out_sock_create: |
3155 | inet_ctl_sock_destroy(sk: net->ipv6.igmp_sk); |
3156 | out: |
3157 | return err; |
3158 | } |
3159 | |
3160 | static void __net_exit igmp6_net_exit(struct net *net) |
3161 | { |
3162 | inet_ctl_sock_destroy(sk: net->ipv6.igmp_sk); |
3163 | inet_ctl_sock_destroy(sk: net->ipv6.mc_autojoin_sk); |
3164 | igmp6_proc_exit(net); |
3165 | } |
3166 | |
3167 | static struct pernet_operations igmp6_net_ops = { |
3168 | .init = igmp6_net_init, |
3169 | .exit = igmp6_net_exit, |
3170 | }; |
3171 | |
3172 | int __init igmp6_init(void) |
3173 | { |
3174 | int err; |
3175 | |
3176 | err = register_pernet_subsys(&igmp6_net_ops); |
3177 | if (err) |
3178 | return err; |
3179 | |
3180 | mld_wq = create_workqueue("mld" ); |
3181 | if (!mld_wq) { |
3182 | unregister_pernet_subsys(&igmp6_net_ops); |
3183 | return -ENOMEM; |
3184 | } |
3185 | |
3186 | return err; |
3187 | } |
3188 | |
3189 | int __init igmp6_late_init(void) |
3190 | { |
3191 | return register_netdevice_notifier(nb: &igmp6_netdev_notifier); |
3192 | } |
3193 | |
3194 | void igmp6_cleanup(void) |
3195 | { |
3196 | unregister_pernet_subsys(&igmp6_net_ops); |
3197 | destroy_workqueue(wq: mld_wq); |
3198 | } |
3199 | |
3200 | void igmp6_late_cleanup(void) |
3201 | { |
3202 | unregister_netdevice_notifier(nb: &igmp6_netdev_notifier); |
3203 | } |
3204 | |