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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / net / ipv4 / igmp.c
blob47f0502b21015ab8e33b99a657d95aca0ac87919
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Linux NET3: Internet Group Management Protocol [IGMP]
4 *
5 * This code implements the IGMP protocol as defined in RFC1112. There has
6 * been a further revision of this protocol since which is now supported.
7 *
8 * If you have trouble with this module be careful what gcc you have used,
9 * the older version didn't come out right using gcc 2.5.8, the newer one
10 * seems to fall out with gcc 2.6.2.
11 *
12 * Authors:
13 * Alan Cox <alan@lxorguk.ukuu.org.uk>
14 *
15 * Fixes:
16 *
17 * Alan Cox : Added lots of __inline__ to optimise
18 * the memory usage of all the tiny little
19 * functions.
20 * Alan Cox : Dumped the header building experiment.
21 * Alan Cox : Minor tweaks ready for multicast routing
22 * and extended IGMP protocol.
23 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
24 * writes utterly bogus code otherwise (sigh)
25 * fixed IGMP loopback to behave in the manner
26 * desired by mrouted, fixed the fact it has been
27 * broken since 1.3.6 and cleaned up a few minor
28 * points.
29 *
30 * Chih-Jen Chang : Tried to revise IGMP to Version 2
31 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
32 * The enhancements are mainly based on Steve Deering's
33 * ipmulti-3.5 source code.
34 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
35 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
36 * the mrouted version on that device.
37 * Chih-Jen Chang : Added the max_resp_time parameter to
38 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
39 * to identify the multicast router version
40 * and do what the IGMP version 2 specified.
41 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
42 * Tsu-Sheng Tsao if the specified time expired.
43 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
44 * Alan Cox : Use GFP_ATOMIC in the right places.
45 * Christian Daudt : igmp timer wasn't set for local group
46 * memberships but was being deleted,
47 * which caused a "del_timer() called
48 * from %p with timer not initialized\n"
49 * message (960131).
50 * Christian Daudt : removed del_timer from
51 * igmp_timer_expire function (960205).
52 * Christian Daudt : igmp_heard_report now only calls
53 * igmp_timer_expire if tm->running is
54 * true (960216).
55 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
56 * igmp_heard_query never trigger. Expiry
57 * miscalculation fixed in igmp_heard_query
58 * and random() made to return unsigned to
59 * prevent negative expiry times.
60 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
61 * fix from pending 2.1.x patches.
62 * Alan Cox: Forget to enable FDDI support earlier.
63 * Alexey Kuznetsov: Fixed leaving groups on device down.
64 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
65 * David L Stevens: IGMPv3 support, with help from
66 * Vinay Kulkarni
67 */
68
69 #include <linux/module.h>
70 #include <linux/slab.h>
71 #include <linux/uaccess.h>
72 #include <linux/types.h>
73 #include <linux/kernel.h>
74 #include <linux/jiffies.h>
75 #include <linux/string.h>
76 #include <linux/socket.h>
77 #include <linux/sockios.h>
78 #include <linux/in.h>
79 #include <linux/inet.h>
80 #include <linux/netdevice.h>
81 #include <linux/skbuff.h>
82 #include <linux/inetdevice.h>
83 #include <linux/igmp.h>
84 #include <linux/if_arp.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/times.h>
87 #include <linux/pkt_sched.h>
88 #include <linux/byteorder/generic.h>
89
90 #include <net/net_namespace.h>
91 #include <net/arp.h>
92 #include <net/ip.h>
93 #include <net/protocol.h>
94 #include <net/route.h>
95 #include <net/sock.h>
96 #include <net/checksum.h>
97 #include <net/inet_common.h>
98 #include <linux/netfilter_ipv4.h>
99 #ifdef CONFIG_IP_MROUTE
100 #include <linux/mroute.h>
101 #endif
102 #ifdef CONFIG_PROC_FS
103 #include <linux/proc_fs.h>
104 #include <linux/seq_file.h>
105 #endif
106
107 #ifdef CONFIG_IP_MULTICAST
108 /* Parameter names and values are taken from igmp-v2-06 draft */
109
110 #define IGMP_QUERY_INTERVAL (125*HZ)
111 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
112
113 #define IGMP_INITIAL_REPORT_DELAY (1)
114
115 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
116 * IGMP specs require to report membership immediately after
117 * joining a group, but we delay the first report by a
118 * small interval. It seems more natural and still does not
119 * contradict to specs provided this delay is small enough.
120 */
121
122 #define IGMP_V1_SEEN(in_dev) \
123 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
124 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
125 ((in_dev)->mr_v1_seen && \
126 time_before(jiffies, (in_dev)->mr_v1_seen)))
127 #define IGMP_V2_SEEN(in_dev) \
128 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
129 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
130 ((in_dev)->mr_v2_seen && \
131 time_before(jiffies, (in_dev)->mr_v2_seen)))
132
133 static int unsolicited_report_interval(struct in_device *in_dev)
134 {
135 int interval_ms, interval_jiffies;
136
137 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
138 interval_ms = IN_DEV_CONF_GET(
139 in_dev,
140 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
141 else /* v3 */
142 interval_ms = IN_DEV_CONF_GET(
143 in_dev,
144 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
145
146 interval_jiffies = msecs_to_jiffies(interval_ms);
147
148 /* _timer functions can't handle a delay of 0 jiffies so ensure
149 * we always return a positive value.
150 */
151 if (interval_jiffies <= 0)
152 interval_jiffies = 1;
153 return interval_jiffies;
154 }
155
156 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
157 gfp_t gfp);
158 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
159 static void igmpv3_clear_delrec(struct in_device *in_dev);
160 static int sf_setstate(struct ip_mc_list *pmc);
161 static void sf_markstate(struct ip_mc_list *pmc);
162 #endif
163 static void ip_mc_clear_src(struct ip_mc_list *pmc);
164 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
165 int sfcount, __be32 *psfsrc, int delta);
166
167 static void ip_ma_put(struct ip_mc_list *im)
168 {
169 if (refcount_dec_and_test(&im->refcnt)) {
170 in_dev_put(im->interface);
171 kfree_rcu(im, rcu);
172 }
173 }
174
175 #define for_each_pmc_rcu(in_dev, pmc) \
176 for (pmc = rcu_dereference(in_dev->mc_list); \
177 pmc != NULL; \
178 pmc = rcu_dereference(pmc->next_rcu))
179
180 #define for_each_pmc_rtnl(in_dev, pmc) \
181 for (pmc = rtnl_dereference(in_dev->mc_list); \
182 pmc != NULL; \
183 pmc = rtnl_dereference(pmc->next_rcu))
184
185 static void ip_sf_list_clear_all(struct ip_sf_list *psf)
186 {
187 struct ip_sf_list *next;
188
189 while (psf) {
190 next = psf->sf_next;
191 kfree(psf);
192 psf = next;
193 }
194 }
195
196 #ifdef CONFIG_IP_MULTICAST
197
198 /*
199 * Timer management
200 */
201
202 static void igmp_stop_timer(struct ip_mc_list *im)
203 {
204 spin_lock_bh(&im->lock);
205 if (del_timer(&im->timer))
206 refcount_dec(&im->refcnt);
207 im->tm_running = 0;
208 im->reporter = 0;
209 im->unsolicit_count = 0;
210 spin_unlock_bh(&im->lock);
211 }
212
213 /* It must be called with locked im->lock */
214 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
215 {
216 int tv = prandom_u32() % max_delay;
217
218 im->tm_running = 1;
219 if (!mod_timer(&im->timer, jiffies+tv+2))
220 refcount_inc(&im->refcnt);
221 }
222
223 static void igmp_gq_start_timer(struct in_device *in_dev)
224 {
225 int tv = prandom_u32() % in_dev->mr_maxdelay;
226 unsigned long exp = jiffies + tv + 2;
227
228 if (in_dev->mr_gq_running &&
229 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
230 return;
231
232 in_dev->mr_gq_running = 1;
233 if (!mod_timer(&in_dev->mr_gq_timer, exp))
234 in_dev_hold(in_dev);
235 }
236
237 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
238 {
239 int tv = prandom_u32() % delay;
240
241 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
242 in_dev_hold(in_dev);
243 }
244
245 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
246 {
247 spin_lock_bh(&im->lock);
248 im->unsolicit_count = 0;
249 if (del_timer(&im->timer)) {
250 if ((long)(im->timer.expires-jiffies) < max_delay) {
251 add_timer(&im->timer);
252 im->tm_running = 1;
253 spin_unlock_bh(&im->lock);
254 return;
255 }
256 refcount_dec(&im->refcnt);
257 }
258 igmp_start_timer(im, max_delay);
259 spin_unlock_bh(&im->lock);
260 }
261
262
263 /*
264 * Send an IGMP report.
265 */
266
267 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
268
269
270 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
271 int gdeleted, int sdeleted)
272 {
273 switch (type) {
274 case IGMPV3_MODE_IS_INCLUDE:
275 case IGMPV3_MODE_IS_EXCLUDE:
276 if (gdeleted || sdeleted)
277 return 0;
278 if (!(pmc->gsquery && !psf->sf_gsresp)) {
279 if (pmc->sfmode == MCAST_INCLUDE)
280 return 1;
281 /* don't include if this source is excluded
282 * in all filters
283 */
284 if (psf->sf_count[MCAST_INCLUDE])
285 return type == IGMPV3_MODE_IS_INCLUDE;
286 return pmc->sfcount[MCAST_EXCLUDE] ==
287 psf->sf_count[MCAST_EXCLUDE];
288 }
289 return 0;
290 case IGMPV3_CHANGE_TO_INCLUDE:
291 if (gdeleted || sdeleted)
292 return 0;
293 return psf->sf_count[MCAST_INCLUDE] != 0;
294 case IGMPV3_CHANGE_TO_EXCLUDE:
295 if (gdeleted || sdeleted)
296 return 0;
297 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
298 psf->sf_count[MCAST_INCLUDE])
299 return 0;
300 return pmc->sfcount[MCAST_EXCLUDE] ==
301 psf->sf_count[MCAST_EXCLUDE];
302 case IGMPV3_ALLOW_NEW_SOURCES:
303 if (gdeleted || !psf->sf_crcount)
304 return 0;
305 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
306 case IGMPV3_BLOCK_OLD_SOURCES:
307 if (pmc->sfmode == MCAST_INCLUDE)
308 return gdeleted || (psf->sf_crcount && sdeleted);
309 return psf->sf_crcount && !gdeleted && !sdeleted;
310 }
311 return 0;
312 }
313
314 static int
315 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
316 {
317 struct ip_sf_list *psf;
318 int scount = 0;
319
320 for (psf = pmc->sources; psf; psf = psf->sf_next) {
321 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
322 continue;
323 scount++;
324 }
325 return scount;
326 }
327
328 /* source address selection per RFC 3376 section 4.2.13 */
329 static __be32 igmpv3_get_srcaddr(struct net_device *dev,
330 const struct flowi4 *fl4)
331 {
332 struct in_device *in_dev = __in_dev_get_rcu(dev);
333 const struct in_ifaddr *ifa;
334
335 if (!in_dev)
336 return htonl(INADDR_ANY);
337
338 in_dev_for_each_ifa_rcu(ifa, in_dev) {
339 if (fl4->saddr == ifa->ifa_local)
340 return fl4->saddr;
341 }
342
343 return htonl(INADDR_ANY);
344 }
345
346 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
347 {
348 struct sk_buff *skb;
349 struct rtable *rt;
350 struct iphdr *pip;
351 struct igmpv3_report *pig;
352 struct net *net = dev_net(dev);
353 struct flowi4 fl4;
354 int hlen = LL_RESERVED_SPACE(dev);
355 int tlen = dev->needed_tailroom;
356 unsigned int size = mtu;
357
358 while (1) {
359 skb = alloc_skb(size + hlen + tlen,
360 GFP_ATOMIC | __GFP_NOWARN);
361 if (skb)
362 break;
363 size >>= 1;
364 if (size < 256)
365 return NULL;
366 }
367 skb->priority = TC_PRIO_CONTROL;
368
369 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
370 0, 0,
371 IPPROTO_IGMP, 0, dev->ifindex);
372 if (IS_ERR(rt)) {
373 kfree_skb(skb);
374 return NULL;
375 }
376
377 skb_dst_set(skb, &rt->dst);
378 skb->dev = dev;
379
380 skb_reserve(skb, hlen);
381 skb_tailroom_reserve(skb, mtu, tlen);
382
383 skb_reset_network_header(skb);
384 pip = ip_hdr(skb);
385 skb_put(skb, sizeof(struct iphdr) + 4);
386
387 pip->version = 4;
388 pip->ihl = (sizeof(struct iphdr)+4)>>2;
389 pip->tos = 0xc0;
390 pip->frag_off = htons(IP_DF);
391 pip->ttl = 1;
392 pip->daddr = fl4.daddr;
393
394 rcu_read_lock();
395 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
396 rcu_read_unlock();
397
398 pip->protocol = IPPROTO_IGMP;
399 pip->tot_len = 0; /* filled in later */
400 ip_select_ident(net, skb, NULL);
401 ((u8 *)&pip[1])[0] = IPOPT_RA;
402 ((u8 *)&pip[1])[1] = 4;
403 ((u8 *)&pip[1])[2] = 0;
404 ((u8 *)&pip[1])[3] = 0;
405
406 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
407 skb_put(skb, sizeof(*pig));
408 pig = igmpv3_report_hdr(skb);
409 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
410 pig->resv1 = 0;
411 pig->csum = 0;
412 pig->resv2 = 0;
413 pig->ngrec = 0;
414 return skb;
415 }
416
417 static int igmpv3_sendpack(struct sk_buff *skb)
418 {
419 struct igmphdr *pig = igmp_hdr(skb);
420 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
421
422 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
423
424 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
425 }
426
427 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
428 {
429 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
430 }
431
432 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
433 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
434 {
435 struct net_device *dev = pmc->interface->dev;
436 struct igmpv3_report *pih;
437 struct igmpv3_grec *pgr;
438
439 if (!skb) {
440 skb = igmpv3_newpack(dev, mtu);
441 if (!skb)
442 return NULL;
443 }
444 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
445 pgr->grec_type = type;
446 pgr->grec_auxwords = 0;
447 pgr->grec_nsrcs = 0;
448 pgr->grec_mca = pmc->multiaddr;
449 pih = igmpv3_report_hdr(skb);
450 pih->ngrec = htons(ntohs(pih->ngrec)+1);
451 *ppgr = pgr;
452 return skb;
453 }
454
455 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
456
457 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
458 int type, int gdeleted, int sdeleted)
459 {
460 struct net_device *dev = pmc->interface->dev;
461 struct net *net = dev_net(dev);
462 struct igmpv3_report *pih;
463 struct igmpv3_grec *pgr = NULL;
464 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
465 int scount, stotal, first, isquery, truncate;
466 unsigned int mtu;
467
468 if (pmc->multiaddr == IGMP_ALL_HOSTS)
469 return skb;
470 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
471 return skb;
472
473 mtu = READ_ONCE(dev->mtu);
474 if (mtu < IPV4_MIN_MTU)
475 return skb;
476
477 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
478 type == IGMPV3_MODE_IS_EXCLUDE;
479 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
480 type == IGMPV3_CHANGE_TO_EXCLUDE;
481
482 stotal = scount = 0;
483
484 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
485
486 if (!*psf_list)
487 goto empty_source;
488
489 pih = skb ? igmpv3_report_hdr(skb) : NULL;
490
491 /* EX and TO_EX get a fresh packet, if needed */
492 if (truncate) {
493 if (pih && pih->ngrec &&
494 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
495 if (skb)
496 igmpv3_sendpack(skb);
497 skb = igmpv3_newpack(dev, mtu);
498 }
499 }
500 first = 1;
501 psf_prev = NULL;
502 for (psf = *psf_list; psf; psf = psf_next) {
503 __be32 *psrc;
504
505 psf_next = psf->sf_next;
506
507 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
508 psf_prev = psf;
509 continue;
510 }
511
512 /* Based on RFC3376 5.1. Should not send source-list change
513 * records when there is a filter mode change.
514 */
515 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
516 (!gdeleted && pmc->crcount)) &&
517 (type == IGMPV3_ALLOW_NEW_SOURCES ||
518 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
519 goto decrease_sf_crcount;
520
521 /* clear marks on query responses */
522 if (isquery)
523 psf->sf_gsresp = 0;
524
525 if (AVAILABLE(skb) < sizeof(__be32) +
526 first*sizeof(struct igmpv3_grec)) {
527 if (truncate && !first)
528 break; /* truncate these */
529 if (pgr)
530 pgr->grec_nsrcs = htons(scount);
531 if (skb)
532 igmpv3_sendpack(skb);
533 skb = igmpv3_newpack(dev, mtu);
534 first = 1;
535 scount = 0;
536 }
537 if (first) {
538 skb = add_grhead(skb, pmc, type, &pgr, mtu);
539 first = 0;
540 }
541 if (!skb)
542 return NULL;
543 psrc = skb_put(skb, sizeof(__be32));
544 *psrc = psf->sf_inaddr;
545 scount++; stotal++;
546 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
547 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
548 decrease_sf_crcount:
549 psf->sf_crcount--;
550 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
551 if (psf_prev)
552 psf_prev->sf_next = psf->sf_next;
553 else
554 *psf_list = psf->sf_next;
555 kfree(psf);
556 continue;
557 }
558 }
559 psf_prev = psf;
560 }
561
562 empty_source:
563 if (!stotal) {
564 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
565 type == IGMPV3_BLOCK_OLD_SOURCES)
566 return skb;
567 if (pmc->crcount || isquery) {
568 /* make sure we have room for group header */
569 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
570 igmpv3_sendpack(skb);
571 skb = NULL; /* add_grhead will get a new one */
572 }
573 skb = add_grhead(skb, pmc, type, &pgr, mtu);
574 }
575 }
576 if (pgr)
577 pgr->grec_nsrcs = htons(scount);
578
579 if (isquery)
580 pmc->gsquery = 0; /* clear query state on report */
581 return skb;
582 }
583
584 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
585 {
586 struct sk_buff *skb = NULL;
587 struct net *net = dev_net(in_dev->dev);
588 int type;
589
590 if (!pmc) {
591 rcu_read_lock();
592 for_each_pmc_rcu(in_dev, pmc) {
593 if (pmc->multiaddr == IGMP_ALL_HOSTS)
594 continue;
595 if (ipv4_is_local_multicast(pmc->multiaddr) &&
596 !net->ipv4.sysctl_igmp_llm_reports)
597 continue;
598 spin_lock_bh(&pmc->lock);
599 if (pmc->sfcount[MCAST_EXCLUDE])
600 type = IGMPV3_MODE_IS_EXCLUDE;
601 else
602 type = IGMPV3_MODE_IS_INCLUDE;
603 skb = add_grec(skb, pmc, type, 0, 0);
604 spin_unlock_bh(&pmc->lock);
605 }
606 rcu_read_unlock();
607 } else {
608 spin_lock_bh(&pmc->lock);
609 if (pmc->sfcount[MCAST_EXCLUDE])
610 type = IGMPV3_MODE_IS_EXCLUDE;
611 else
612 type = IGMPV3_MODE_IS_INCLUDE;
613 skb = add_grec(skb, pmc, type, 0, 0);
614 spin_unlock_bh(&pmc->lock);
615 }
616 if (!skb)
617 return 0;
618 return igmpv3_sendpack(skb);
619 }
620
621 /*
622 * remove zero-count source records from a source filter list
623 */
624 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
625 {
626 struct ip_sf_list *psf_prev, *psf_next, *psf;
627
628 psf_prev = NULL;
629 for (psf = *ppsf; psf; psf = psf_next) {
630 psf_next = psf->sf_next;
631 if (psf->sf_crcount == 0) {
632 if (psf_prev)
633 psf_prev->sf_next = psf->sf_next;
634 else
635 *ppsf = psf->sf_next;
636 kfree(psf);
637 } else
638 psf_prev = psf;
639 }
640 }
641
642 static void kfree_pmc(struct ip_mc_list *pmc)
643 {
644 ip_sf_list_clear_all(pmc->sources);
645 ip_sf_list_clear_all(pmc->tomb);
646 kfree(pmc);
647 }
648
649 static void igmpv3_send_cr(struct in_device *in_dev)
650 {
651 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
652 struct sk_buff *skb = NULL;
653 int type, dtype;
654
655 rcu_read_lock();
656 spin_lock_bh(&in_dev->mc_tomb_lock);
657
658 /* deleted MCA's */
659 pmc_prev = NULL;
660 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
661 pmc_next = pmc->next;
662 if (pmc->sfmode == MCAST_INCLUDE) {
663 type = IGMPV3_BLOCK_OLD_SOURCES;
664 dtype = IGMPV3_BLOCK_OLD_SOURCES;
665 skb = add_grec(skb, pmc, type, 1, 0);
666 skb = add_grec(skb, pmc, dtype, 1, 1);
667 }
668 if (pmc->crcount) {
669 if (pmc->sfmode == MCAST_EXCLUDE) {
670 type = IGMPV3_CHANGE_TO_INCLUDE;
671 skb = add_grec(skb, pmc, type, 1, 0);
672 }
673 pmc->crcount--;
674 if (pmc->crcount == 0) {
675 igmpv3_clear_zeros(&pmc->tomb);
676 igmpv3_clear_zeros(&pmc->sources);
677 }
678 }
679 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
680 if (pmc_prev)
681 pmc_prev->next = pmc_next;
682 else
683 in_dev->mc_tomb = pmc_next;
684 in_dev_put(pmc->interface);
685 kfree_pmc(pmc);
686 } else
687 pmc_prev = pmc;
688 }
689 spin_unlock_bh(&in_dev->mc_tomb_lock);
690
691 /* change recs */
692 for_each_pmc_rcu(in_dev, pmc) {
693 spin_lock_bh(&pmc->lock);
694 if (pmc->sfcount[MCAST_EXCLUDE]) {
695 type = IGMPV3_BLOCK_OLD_SOURCES;
696 dtype = IGMPV3_ALLOW_NEW_SOURCES;
697 } else {
698 type = IGMPV3_ALLOW_NEW_SOURCES;
699 dtype = IGMPV3_BLOCK_OLD_SOURCES;
700 }
701 skb = add_grec(skb, pmc, type, 0, 0);
702 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
703
704 /* filter mode changes */
705 if (pmc->crcount) {
706 if (pmc->sfmode == MCAST_EXCLUDE)
707 type = IGMPV3_CHANGE_TO_EXCLUDE;
708 else
709 type = IGMPV3_CHANGE_TO_INCLUDE;
710 skb = add_grec(skb, pmc, type, 0, 0);
711 pmc->crcount--;
712 }
713 spin_unlock_bh(&pmc->lock);
714 }
715 rcu_read_unlock();
716
717 if (!skb)
718 return;
719 (void) igmpv3_sendpack(skb);
720 }
721
722 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
723 int type)
724 {
725 struct sk_buff *skb;
726 struct iphdr *iph;
727 struct igmphdr *ih;
728 struct rtable *rt;
729 struct net_device *dev = in_dev->dev;
730 struct net *net = dev_net(dev);
731 __be32 group = pmc ? pmc->multiaddr : 0;
732 struct flowi4 fl4;
733 __be32 dst;
734 int hlen, tlen;
735
736 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
737 return igmpv3_send_report(in_dev, pmc);
738
739 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
740 return 0;
741
742 if (type == IGMP_HOST_LEAVE_MESSAGE)
743 dst = IGMP_ALL_ROUTER;
744 else
745 dst = group;
746
747 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
748 0, 0,
749 IPPROTO_IGMP, 0, dev->ifindex);
750 if (IS_ERR(rt))
751 return -1;
752
753 hlen = LL_RESERVED_SPACE(dev);
754 tlen = dev->needed_tailroom;
755 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
756 if (!skb) {
757 ip_rt_put(rt);
758 return -1;
759 }
760 skb->priority = TC_PRIO_CONTROL;
761
762 skb_dst_set(skb, &rt->dst);
763
764 skb_reserve(skb, hlen);
765
766 skb_reset_network_header(skb);
767 iph = ip_hdr(skb);
768 skb_put(skb, sizeof(struct iphdr) + 4);
769
770 iph->version = 4;
771 iph->ihl = (sizeof(struct iphdr)+4)>>2;
772 iph->tos = 0xc0;
773 iph->frag_off = htons(IP_DF);
774 iph->ttl = 1;
775 iph->daddr = dst;
776 iph->saddr = fl4.saddr;
777 iph->protocol = IPPROTO_IGMP;
778 ip_select_ident(net, skb, NULL);
779 ((u8 *)&iph[1])[0] = IPOPT_RA;
780 ((u8 *)&iph[1])[1] = 4;
781 ((u8 *)&iph[1])[2] = 0;
782 ((u8 *)&iph[1])[3] = 0;
783
784 ih = skb_put(skb, sizeof(struct igmphdr));
785 ih->type = type;
786 ih->code = 0;
787 ih->csum = 0;
788 ih->group = group;
789 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
790
791 return ip_local_out(net, skb->sk, skb);
792 }
793
794 static void igmp_gq_timer_expire(struct timer_list *t)
795 {
796 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
797
798 in_dev->mr_gq_running = 0;
799 igmpv3_send_report(in_dev, NULL);
800 in_dev_put(in_dev);
801 }
802
803 static void igmp_ifc_timer_expire(struct timer_list *t)
804 {
805 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
806
807 igmpv3_send_cr(in_dev);
808 if (in_dev->mr_ifc_count) {
809 in_dev->mr_ifc_count--;
810 igmp_ifc_start_timer(in_dev,
811 unsolicited_report_interval(in_dev));
812 }
813 in_dev_put(in_dev);
814 }
815
816 static void igmp_ifc_event(struct in_device *in_dev)
817 {
818 struct net *net = dev_net(in_dev->dev);
819 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
820 return;
821 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
822 igmp_ifc_start_timer(in_dev, 1);
823 }
824
825
826 static void igmp_timer_expire(struct timer_list *t)
827 {
828 struct ip_mc_list *im = from_timer(im, t, timer);
829 struct in_device *in_dev = im->interface;
830
831 spin_lock(&im->lock);
832 im->tm_running = 0;
833
834 if (im->unsolicit_count && --im->unsolicit_count)
835 igmp_start_timer(im, unsolicited_report_interval(in_dev));
836
837 im->reporter = 1;
838 spin_unlock(&im->lock);
839
840 if (IGMP_V1_SEEN(in_dev))
841 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
842 else if (IGMP_V2_SEEN(in_dev))
843 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
844 else
845 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
846
847 ip_ma_put(im);
848 }
849
850 /* mark EXCLUDE-mode sources */
851 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
852 {
853 struct ip_sf_list *psf;
854 int i, scount;
855
856 scount = 0;
857 for (psf = pmc->sources; psf; psf = psf->sf_next) {
858 if (scount == nsrcs)
859 break;
860 for (i = 0; i < nsrcs; i++) {
861 /* skip inactive filters */
862 if (psf->sf_count[MCAST_INCLUDE] ||
863 pmc->sfcount[MCAST_EXCLUDE] !=
864 psf->sf_count[MCAST_EXCLUDE])
865 break;
866 if (srcs[i] == psf->sf_inaddr) {
867 scount++;
868 break;
869 }
870 }
871 }
872 pmc->gsquery = 0;
873 if (scount == nsrcs) /* all sources excluded */
874 return 0;
875 return 1;
876 }
877
878 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
879 {
880 struct ip_sf_list *psf;
881 int i, scount;
882
883 if (pmc->sfmode == MCAST_EXCLUDE)
884 return igmp_xmarksources(pmc, nsrcs, srcs);
885
886 /* mark INCLUDE-mode sources */
887 scount = 0;
888 for (psf = pmc->sources; psf; psf = psf->sf_next) {
889 if (scount == nsrcs)
890 break;
891 for (i = 0; i < nsrcs; i++)
892 if (srcs[i] == psf->sf_inaddr) {
893 psf->sf_gsresp = 1;
894 scount++;
895 break;
896 }
897 }
898 if (!scount) {
899 pmc->gsquery = 0;
900 return 0;
901 }
902 pmc->gsquery = 1;
903 return 1;
904 }
905
906 /* return true if packet was dropped */
907 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
908 {
909 struct ip_mc_list *im;
910 struct net *net = dev_net(in_dev->dev);
911
912 /* Timers are only set for non-local groups */
913
914 if (group == IGMP_ALL_HOSTS)
915 return false;
916 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
917 return false;
918
919 rcu_read_lock();
920 for_each_pmc_rcu(in_dev, im) {
921 if (im->multiaddr == group) {
922 igmp_stop_timer(im);
923 break;
924 }
925 }
926 rcu_read_unlock();
927 return false;
928 }
929
930 /* return true if packet was dropped */
931 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
932 int len)
933 {
934 struct igmphdr *ih = igmp_hdr(skb);
935 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
936 struct ip_mc_list *im;
937 __be32 group = ih->group;
938 int max_delay;
939 int mark = 0;
940 struct net *net = dev_net(in_dev->dev);
941
942
943 if (len == 8) {
944 if (ih->code == 0) {
945 /* Alas, old v1 router presents here. */
946
947 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
948 in_dev->mr_v1_seen = jiffies +
949 (in_dev->mr_qrv * in_dev->mr_qi) +
950 in_dev->mr_qri;
951 group = 0;
952 } else {
953 /* v2 router present */
954 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
955 in_dev->mr_v2_seen = jiffies +
956 (in_dev->mr_qrv * in_dev->mr_qi) +
957 in_dev->mr_qri;
958 }
959 /* cancel the interface change timer */
960 in_dev->mr_ifc_count = 0;
961 if (del_timer(&in_dev->mr_ifc_timer))
962 __in_dev_put(in_dev);
963 /* clear deleted report items */
964 igmpv3_clear_delrec(in_dev);
965 } else if (len < 12) {
966 return true; /* ignore bogus packet; freed by caller */
967 } else if (IGMP_V1_SEEN(in_dev)) {
968 /* This is a v3 query with v1 queriers present */
969 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
970 group = 0;
971 } else if (IGMP_V2_SEEN(in_dev)) {
972 /* this is a v3 query with v2 queriers present;
973 * Interpretation of the max_delay code is problematic here.
974 * A real v2 host would use ih_code directly, while v3 has a
975 * different encoding. We use the v3 encoding as more likely
976 * to be intended in a v3 query.
977 */
978 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
979 if (!max_delay)
980 max_delay = 1; /* can't mod w/ 0 */
981 } else { /* v3 */
982 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
983 return true;
984
985 ih3 = igmpv3_query_hdr(skb);
986 if (ih3->nsrcs) {
987 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
988 + ntohs(ih3->nsrcs)*sizeof(__be32)))
989 return true;
990 ih3 = igmpv3_query_hdr(skb);
991 }
992
993 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
994 if (!max_delay)
995 max_delay = 1; /* can't mod w/ 0 */
996 in_dev->mr_maxdelay = max_delay;
997
998 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
999 * received value was zero, use the default or statically
1000 * configured value.
1001 */
1002 in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv;
1003 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL;
1004
1005 /* RFC3376, 8.3. Query Response Interval:
1006 * The number of seconds represented by the [Query Response
1007 * Interval] must be less than the [Query Interval].
1008 */
1009 if (in_dev->mr_qri >= in_dev->mr_qi)
1010 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ;
1011
1012 if (!group) { /* general query */
1013 if (ih3->nsrcs)
1014 return true; /* no sources allowed */
1015 igmp_gq_start_timer(in_dev);
1016 return false;
1017 }
1018 /* mark sources to include, if group & source-specific */
1019 mark = ih3->nsrcs != 0;
1020 }
1021
1022 /*
1023 * - Start the timers in all of our membership records
1024 * that the query applies to for the interface on
1025 * which the query arrived excl. those that belong
1026 * to a "local" group (224.0.0.X)
1027 * - For timers already running check if they need to
1028 * be reset.
1029 * - Use the igmp->igmp_code field as the maximum
1030 * delay possible
1031 */
1032 rcu_read_lock();
1033 for_each_pmc_rcu(in_dev, im) {
1034 int changed;
1035
1036 if (group && group != im->multiaddr)
1037 continue;
1038 if (im->multiaddr == IGMP_ALL_HOSTS)
1039 continue;
1040 if (ipv4_is_local_multicast(im->multiaddr) &&
1041 !net->ipv4.sysctl_igmp_llm_reports)
1042 continue;
1043 spin_lock_bh(&im->lock);
1044 if (im->tm_running)
1045 im->gsquery = im->gsquery && mark;
1046 else
1047 im->gsquery = mark;
1048 changed = !im->gsquery ||
1049 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1050 spin_unlock_bh(&im->lock);
1051 if (changed)
1052 igmp_mod_timer(im, max_delay);
1053 }
1054 rcu_read_unlock();
1055 return false;
1056 }
1057
1058 /* called in rcu_read_lock() section */
1059 int igmp_rcv(struct sk_buff *skb)
1060 {
1061 /* This basically follows the spec line by line -- see RFC1112 */
1062 struct igmphdr *ih;
1063 struct net_device *dev = skb->dev;
1064 struct in_device *in_dev;
1065 int len = skb->len;
1066 bool dropped = true;
1067
1068 if (netif_is_l3_master(dev)) {
1069 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1070 if (!dev)
1071 goto drop;
1072 }
1073
1074 in_dev = __in_dev_get_rcu(dev);
1075 if (!in_dev)
1076 goto drop;
1077
1078 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1079 goto drop;
1080
1081 if (skb_checksum_simple_validate(skb))
1082 goto drop;
1083
1084 ih = igmp_hdr(skb);
1085 switch (ih->type) {
1086 case IGMP_HOST_MEMBERSHIP_QUERY:
1087 dropped = igmp_heard_query(in_dev, skb, len);
1088 break;
1089 case IGMP_HOST_MEMBERSHIP_REPORT:
1090 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1091 /* Is it our report looped back? */
1092 if (rt_is_output_route(skb_rtable(skb)))
1093 break;
1094 /* don't rely on MC router hearing unicast reports */
1095 if (skb->pkt_type == PACKET_MULTICAST ||
1096 skb->pkt_type == PACKET_BROADCAST)
1097 dropped = igmp_heard_report(in_dev, ih->group);
1098 break;
1099 case IGMP_PIM:
1100 #ifdef CONFIG_IP_PIMSM_V1
1101 return pim_rcv_v1(skb);
1102 #endif
1103 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1104 case IGMP_DVMRP:
1105 case IGMP_TRACE:
1106 case IGMP_HOST_LEAVE_MESSAGE:
1107 case IGMP_MTRACE:
1108 case IGMP_MTRACE_RESP:
1109 break;
1110 default:
1111 break;
1112 }
1113
1114 drop:
1115 if (dropped)
1116 kfree_skb(skb);
1117 else
1118 consume_skb(skb);
1119 return 0;
1120 }
1121
1122 #endif
1123
1124
1125 /*
1126 * Add a filter to a device
1127 */
1128
1129 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1130 {
1131 char buf[MAX_ADDR_LEN];
1132 struct net_device *dev = in_dev->dev;
1133
1134 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1135 We will get multicast token leakage, when IFF_MULTICAST
1136 is changed. This check should be done in ndo_set_rx_mode
1137 routine. Something sort of:
1138 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1139 --ANK
1140 */
1141 if (arp_mc_map(addr, buf, dev, 0) == 0)
1142 dev_mc_add(dev, buf);
1143 }
1144
1145 /*
1146 * Remove a filter from a device
1147 */
1148
1149 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1150 {
1151 char buf[MAX_ADDR_LEN];
1152 struct net_device *dev = in_dev->dev;
1153
1154 if (arp_mc_map(addr, buf, dev, 0) == 0)
1155 dev_mc_del(dev, buf);
1156 }
1157
1158 #ifdef CONFIG_IP_MULTICAST
1159 /*
1160 * deleted ip_mc_list manipulation
1161 */
1162 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
1163 gfp_t gfp)
1164 {
1165 struct ip_mc_list *pmc;
1166 struct net *net = dev_net(in_dev->dev);
1167
1168 /* this is an "ip_mc_list" for convenience; only the fields below
1169 * are actually used. In particular, the refcnt and users are not
1170 * used for management of the delete list. Using the same structure
1171 * for deleted items allows change reports to use common code with
1172 * non-deleted or query-response MCA's.
1173 */
1174 pmc = kzalloc(sizeof(*pmc), gfp);
1175 if (!pmc)
1176 return;
1177 spin_lock_init(&pmc->lock);
1178 spin_lock_bh(&im->lock);
1179 pmc->interface = im->interface;
1180 in_dev_hold(in_dev);
1181 pmc->multiaddr = im->multiaddr;
1182 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1183 pmc->sfmode = im->sfmode;
1184 if (pmc->sfmode == MCAST_INCLUDE) {
1185 struct ip_sf_list *psf;
1186
1187 pmc->tomb = im->tomb;
1188 pmc->sources = im->sources;
1189 im->tomb = im->sources = NULL;
1190 for (psf = pmc->sources; psf; psf = psf->sf_next)
1191 psf->sf_crcount = pmc->crcount;
1192 }
1193 spin_unlock_bh(&im->lock);
1194
1195 spin_lock_bh(&in_dev->mc_tomb_lock);
1196 pmc->next = in_dev->mc_tomb;
1197 in_dev->mc_tomb = pmc;
1198 spin_unlock_bh(&in_dev->mc_tomb_lock);
1199 }
1200
1201 /*
1202 * restore ip_mc_list deleted records
1203 */
1204 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1205 {
1206 struct ip_mc_list *pmc, *pmc_prev;
1207 struct ip_sf_list *psf;
1208 struct net *net = dev_net(in_dev->dev);
1209 __be32 multiaddr = im->multiaddr;
1210
1211 spin_lock_bh(&in_dev->mc_tomb_lock);
1212 pmc_prev = NULL;
1213 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1214 if (pmc->multiaddr == multiaddr)
1215 break;
1216 pmc_prev = pmc;
1217 }
1218 if (pmc) {
1219 if (pmc_prev)
1220 pmc_prev->next = pmc->next;
1221 else
1222 in_dev->mc_tomb = pmc->next;
1223 }
1224 spin_unlock_bh(&in_dev->mc_tomb_lock);
1225
1226 spin_lock_bh(&im->lock);
1227 if (pmc) {
1228 im->interface = pmc->interface;
1229 if (im->sfmode == MCAST_INCLUDE) {
1230 swap(im->tomb, pmc->tomb);
1231 swap(im->sources, pmc->sources);
1232 for (psf = im->sources; psf; psf = psf->sf_next)
1233 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1234 } else {
1235 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1236 }
1237 in_dev_put(pmc->interface);
1238 kfree_pmc(pmc);
1239 }
1240 spin_unlock_bh(&im->lock);
1241 }
1242
1243 /*
1244 * flush ip_mc_list deleted records
1245 */
1246 static void igmpv3_clear_delrec(struct in_device *in_dev)
1247 {
1248 struct ip_mc_list *pmc, *nextpmc;
1249
1250 spin_lock_bh(&in_dev->mc_tomb_lock);
1251 pmc = in_dev->mc_tomb;
1252 in_dev->mc_tomb = NULL;
1253 spin_unlock_bh(&in_dev->mc_tomb_lock);
1254
1255 for (; pmc; pmc = nextpmc) {
1256 nextpmc = pmc->next;
1257 ip_mc_clear_src(pmc);
1258 in_dev_put(pmc->interface);
1259 kfree_pmc(pmc);
1260 }
1261 /* clear dead sources, too */
1262 rcu_read_lock();
1263 for_each_pmc_rcu(in_dev, pmc) {
1264 struct ip_sf_list *psf;
1265
1266 spin_lock_bh(&pmc->lock);
1267 psf = pmc->tomb;
1268 pmc->tomb = NULL;
1269 spin_unlock_bh(&pmc->lock);
1270 ip_sf_list_clear_all(psf);
1271 }
1272 rcu_read_unlock();
1273 }
1274 #endif
1275
1276 static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp)
1277 {
1278 struct in_device *in_dev = im->interface;
1279 #ifdef CONFIG_IP_MULTICAST
1280 struct net *net = dev_net(in_dev->dev);
1281 int reporter;
1282 #endif
1283
1284 if (im->loaded) {
1285 im->loaded = 0;
1286 ip_mc_filter_del(in_dev, im->multiaddr);
1287 }
1288
1289 #ifdef CONFIG_IP_MULTICAST
1290 if (im->multiaddr == IGMP_ALL_HOSTS)
1291 return;
1292 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1293 return;
1294
1295 reporter = im->reporter;
1296 igmp_stop_timer(im);
1297
1298 if (!in_dev->dead) {
1299 if (IGMP_V1_SEEN(in_dev))
1300 return;
1301 if (IGMP_V2_SEEN(in_dev)) {
1302 if (reporter)
1303 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1304 return;
1305 }
1306 /* IGMPv3 */
1307 igmpv3_add_delrec(in_dev, im, gfp);
1308
1309 igmp_ifc_event(in_dev);
1310 }
1311 #endif
1312 }
1313
1314 static void igmp_group_dropped(struct ip_mc_list *im)
1315 {
1316 __igmp_group_dropped(im, GFP_KERNEL);
1317 }
1318
1319 static void igmp_group_added(struct ip_mc_list *im)
1320 {
1321 struct in_device *in_dev = im->interface;
1322 #ifdef CONFIG_IP_MULTICAST
1323 struct net *net = dev_net(in_dev->dev);
1324 #endif
1325
1326 if (im->loaded == 0) {
1327 im->loaded = 1;
1328 ip_mc_filter_add(in_dev, im->multiaddr);
1329 }
1330
1331 #ifdef CONFIG_IP_MULTICAST
1332 if (im->multiaddr == IGMP_ALL_HOSTS)
1333 return;
1334 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1335 return;
1336
1337 if (in_dev->dead)
1338 return;
1339
1340 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1341 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1342 spin_lock_bh(&im->lock);
1343 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1344 spin_unlock_bh(&im->lock);
1345 return;
1346 }
1347 /* else, v3 */
1348
1349 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
1350 * not send filter-mode change record as the mode should be from
1351 * IN() to IN(A).
1352 */
1353 if (im->sfmode == MCAST_EXCLUDE)
1354 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1355
1356 igmp_ifc_event(in_dev);
1357 #endif
1358 }
1359
1360
1361 /*
1362 * Multicast list managers
1363 */
1364
1365 static u32 ip_mc_hash(const struct ip_mc_list *im)
1366 {
1367 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1368 }
1369
1370 static void ip_mc_hash_add(struct in_device *in_dev,
1371 struct ip_mc_list *im)
1372 {
1373 struct ip_mc_list __rcu **mc_hash;
1374 u32 hash;
1375
1376 mc_hash = rtnl_dereference(in_dev->mc_hash);
1377 if (mc_hash) {
1378 hash = ip_mc_hash(im);
1379 im->next_hash = mc_hash[hash];
1380 rcu_assign_pointer(mc_hash[hash], im);
1381 return;
1382 }
1383
1384 /* do not use a hash table for small number of items */
1385 if (in_dev->mc_count < 4)
1386 return;
1387
1388 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1389 GFP_KERNEL);
1390 if (!mc_hash)
1391 return;
1392
1393 for_each_pmc_rtnl(in_dev, im) {
1394 hash = ip_mc_hash(im);
1395 im->next_hash = mc_hash[hash];
1396 RCU_INIT_POINTER(mc_hash[hash], im);
1397 }
1398
1399 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1400 }
1401
1402 static void ip_mc_hash_remove(struct in_device *in_dev,
1403 struct ip_mc_list *im)
1404 {
1405 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1406 struct ip_mc_list *aux;
1407
1408 if (!mc_hash)
1409 return;
1410 mc_hash += ip_mc_hash(im);
1411 while ((aux = rtnl_dereference(*mc_hash)) != im)
1412 mc_hash = &aux->next_hash;
1413 *mc_hash = im->next_hash;
1414 }
1415
1416
1417 /*
1418 * A socket has joined a multicast group on device dev.
1419 */
1420 static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
1421 unsigned int mode, gfp_t gfp)
1422 {
1423 struct ip_mc_list *im;
1424
1425 ASSERT_RTNL();
1426
1427 for_each_pmc_rtnl(in_dev, im) {
1428 if (im->multiaddr == addr) {
1429 im->users++;
1430 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
1431 goto out;
1432 }
1433 }
1434
1435 im = kzalloc(sizeof(*im), gfp);
1436 if (!im)
1437 goto out;
1438
1439 im->users = 1;
1440 im->interface = in_dev;
1441 in_dev_hold(in_dev);
1442 im->multiaddr = addr;
1443 /* initial mode is (EX, empty) */
1444 im->sfmode = mode;
1445 im->sfcount[mode] = 1;
1446 refcount_set(&im->refcnt, 1);
1447 spin_lock_init(&im->lock);
1448 #ifdef CONFIG_IP_MULTICAST
1449 timer_setup(&im->timer, igmp_timer_expire, 0);
1450 #endif
1451
1452 im->next_rcu = in_dev->mc_list;
1453 in_dev->mc_count++;
1454 rcu_assign_pointer(in_dev->mc_list, im);
1455
1456 ip_mc_hash_add(in_dev, im);
1457
1458 #ifdef CONFIG_IP_MULTICAST
1459 igmpv3_del_delrec(in_dev, im);
1460 #endif
1461 igmp_group_added(im);
1462 if (!in_dev->dead)
1463 ip_rt_multicast_event(in_dev);
1464 out:
1465 return;
1466 }
1467
1468 void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1469 {
1470 ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp);
1471 }
1472 EXPORT_SYMBOL(__ip_mc_inc_group);
1473
1474 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1475 {
1476 __ip_mc_inc_group(in_dev, addr, GFP_KERNEL);
1477 }
1478 EXPORT_SYMBOL(ip_mc_inc_group);
1479
1480 static int ip_mc_check_iphdr(struct sk_buff *skb)
1481 {
1482 const struct iphdr *iph;
1483 unsigned int len;
1484 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1485
1486 if (!pskb_may_pull(skb, offset))
1487 return -EINVAL;
1488
1489 iph = ip_hdr(skb);
1490
1491 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1492 return -EINVAL;
1493
1494 offset += ip_hdrlen(skb) - sizeof(*iph);
1495
1496 if (!pskb_may_pull(skb, offset))
1497 return -EINVAL;
1498
1499 iph = ip_hdr(skb);
1500
1501 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1502 return -EINVAL;
1503
1504 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1505 if (skb->len < len || len < offset)
1506 return -EINVAL;
1507
1508 skb_set_transport_header(skb, offset);
1509
1510 return 0;
1511 }
1512
1513 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1514 {
1515 unsigned int len = skb_transport_offset(skb);
1516
1517 len += sizeof(struct igmpv3_report);
1518
1519 return ip_mc_may_pull(skb, len) ? 0 : -EINVAL;
1520 }
1521
1522 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1523 {
1524 unsigned int transport_len = ip_transport_len(skb);
1525 unsigned int len;
1526
1527 /* IGMPv{1,2}? */
1528 if (transport_len != sizeof(struct igmphdr)) {
1529 /* or IGMPv3? */
1530 if (transport_len < sizeof(struct igmpv3_query))
1531 return -EINVAL;
1532
1533 len = skb_transport_offset(skb) + sizeof(struct igmpv3_query);
1534 if (!ip_mc_may_pull(skb, len))
1535 return -EINVAL;
1536 }
1537
1538 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1539 * all-systems destination addresses (224.0.0.1) for general queries
1540 */
1541 if (!igmp_hdr(skb)->group &&
1542 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1543 return -EINVAL;
1544
1545 return 0;
1546 }
1547
1548 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1549 {
1550 switch (igmp_hdr(skb)->type) {
1551 case IGMP_HOST_LEAVE_MESSAGE:
1552 case IGMP_HOST_MEMBERSHIP_REPORT:
1553 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1554 return 0;
1555 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1556 return ip_mc_check_igmp_reportv3(skb);
1557 case IGMP_HOST_MEMBERSHIP_QUERY:
1558 return ip_mc_check_igmp_query(skb);
1559 default:
1560 return -ENOMSG;
1561 }
1562 }
1563
1564 static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1565 {
1566 return skb_checksum_simple_validate(skb);
1567 }
1568
1569 static int ip_mc_check_igmp_csum(struct sk_buff *skb)
1570 {
1571 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1572 unsigned int transport_len = ip_transport_len(skb);
1573 struct sk_buff *skb_chk;
1574
1575 if (!ip_mc_may_pull(skb, len))
1576 return -EINVAL;
1577
1578 skb_chk = skb_checksum_trimmed(skb, transport_len,
1579 ip_mc_validate_checksum);
1580 if (!skb_chk)
1581 return -EINVAL;
1582
1583 if (skb_chk != skb)
1584 kfree_skb(skb_chk);
1585
1586 return 0;
1587 }
1588
1589 /**
1590 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1591 * @skb: the skb to validate
1592 *
1593 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1594 * skb transport header accordingly and returns zero.
1595 *
1596 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1597 * standard
1598 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1599 * -ENOMEM: A memory allocation failure happened.
1600 *
1601 * Caller needs to set the skb network header and free any returned skb if it
1602 * differs from the provided skb.
1603 */
1604 int ip_mc_check_igmp(struct sk_buff *skb)
1605 {
1606 int ret = ip_mc_check_iphdr(skb);
1607
1608 if (ret < 0)
1609 return ret;
1610
1611 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1612 return -ENOMSG;
1613
1614 ret = ip_mc_check_igmp_csum(skb);
1615 if (ret < 0)
1616 return ret;
1617
1618 return ip_mc_check_igmp_msg(skb);
1619 }
1620 EXPORT_SYMBOL(ip_mc_check_igmp);
1621
1622 /*
1623 * Resend IGMP JOIN report; used by netdev notifier.
1624 */
1625 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1626 {
1627 #ifdef CONFIG_IP_MULTICAST
1628 struct ip_mc_list *im;
1629 int type;
1630 struct net *net = dev_net(in_dev->dev);
1631
1632 ASSERT_RTNL();
1633
1634 for_each_pmc_rtnl(in_dev, im) {
1635 if (im->multiaddr == IGMP_ALL_HOSTS)
1636 continue;
1637 if (ipv4_is_local_multicast(im->multiaddr) &&
1638 !net->ipv4.sysctl_igmp_llm_reports)
1639 continue;
1640
1641 /* a failover is happening and switches
1642 * must be notified immediately
1643 */
1644 if (IGMP_V1_SEEN(in_dev))
1645 type = IGMP_HOST_MEMBERSHIP_REPORT;
1646 else if (IGMP_V2_SEEN(in_dev))
1647 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1648 else
1649 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1650 igmp_send_report(in_dev, im, type);
1651 }
1652 #endif
1653 }
1654
1655 /*
1656 * A socket has left a multicast group on device dev
1657 */
1658
1659 void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1660 {
1661 struct ip_mc_list *i;
1662 struct ip_mc_list __rcu **ip;
1663
1664 ASSERT_RTNL();
1665
1666 for (ip = &in_dev->mc_list;
1667 (i = rtnl_dereference(*ip)) != NULL;
1668 ip = &i->next_rcu) {
1669 if (i->multiaddr == addr) {
1670 if (--i->users == 0) {
1671 ip_mc_hash_remove(in_dev, i);
1672 *ip = i->next_rcu;
1673 in_dev->mc_count--;
1674 __igmp_group_dropped(i, gfp);
1675 ip_mc_clear_src(i);
1676
1677 if (!in_dev->dead)
1678 ip_rt_multicast_event(in_dev);
1679
1680 ip_ma_put(i);
1681 return;
1682 }
1683 break;
1684 }
1685 }
1686 }
1687 EXPORT_SYMBOL(__ip_mc_dec_group);
1688
1689 /* Device changing type */
1690
1691 void ip_mc_unmap(struct in_device *in_dev)
1692 {
1693 struct ip_mc_list *pmc;
1694
1695 ASSERT_RTNL();
1696
1697 for_each_pmc_rtnl(in_dev, pmc)
1698 igmp_group_dropped(pmc);
1699 }
1700
1701 void ip_mc_remap(struct in_device *in_dev)
1702 {
1703 struct ip_mc_list *pmc;
1704
1705 ASSERT_RTNL();
1706
1707 for_each_pmc_rtnl(in_dev, pmc) {
1708 #ifdef CONFIG_IP_MULTICAST
1709 igmpv3_del_delrec(in_dev, pmc);
1710 #endif
1711 igmp_group_added(pmc);
1712 }
1713 }
1714
1715 /* Device going down */
1716
1717 void ip_mc_down(struct in_device *in_dev)
1718 {
1719 struct ip_mc_list *pmc;
1720
1721 ASSERT_RTNL();
1722
1723 for_each_pmc_rtnl(in_dev, pmc)
1724 igmp_group_dropped(pmc);
1725
1726 #ifdef CONFIG_IP_MULTICAST
1727 in_dev->mr_ifc_count = 0;
1728 if (del_timer(&in_dev->mr_ifc_timer))
1729 __in_dev_put(in_dev);
1730 in_dev->mr_gq_running = 0;
1731 if (del_timer(&in_dev->mr_gq_timer))
1732 __in_dev_put(in_dev);
1733 #endif
1734
1735 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1736 }
1737
1738 #ifdef CONFIG_IP_MULTICAST
1739 static void ip_mc_reset(struct in_device *in_dev)
1740 {
1741 struct net *net = dev_net(in_dev->dev);
1742
1743 in_dev->mr_qi = IGMP_QUERY_INTERVAL;
1744 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
1745 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1746 }
1747 #else
1748 static void ip_mc_reset(struct in_device *in_dev)
1749 {
1750 }
1751 #endif
1752
1753 void ip_mc_init_dev(struct in_device *in_dev)
1754 {
1755 ASSERT_RTNL();
1756
1757 #ifdef CONFIG_IP_MULTICAST
1758 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1759 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1760 #endif
1761 ip_mc_reset(in_dev);
1762
1763 spin_lock_init(&in_dev->mc_tomb_lock);
1764 }
1765
1766 /* Device going up */
1767
1768 void ip_mc_up(struct in_device *in_dev)
1769 {
1770 struct ip_mc_list *pmc;
1771
1772 ASSERT_RTNL();
1773
1774 ip_mc_reset(in_dev);
1775 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1776
1777 for_each_pmc_rtnl(in_dev, pmc) {
1778 #ifdef CONFIG_IP_MULTICAST
1779 igmpv3_del_delrec(in_dev, pmc);
1780 #endif
1781 igmp_group_added(pmc);
1782 }
1783 }
1784
1785 /*
1786 * Device is about to be destroyed: clean up.
1787 */
1788
1789 void ip_mc_destroy_dev(struct in_device *in_dev)
1790 {
1791 struct ip_mc_list *i;
1792
1793 ASSERT_RTNL();
1794
1795 /* Deactivate timers */
1796 ip_mc_down(in_dev);
1797 #ifdef CONFIG_IP_MULTICAST
1798 igmpv3_clear_delrec(in_dev);
1799 #endif
1800
1801 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1802 in_dev->mc_list = i->next_rcu;
1803 in_dev->mc_count--;
1804 ip_ma_put(i);
1805 }
1806 }
1807
1808 /* RTNL is locked */
1809 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1810 {
1811 struct net_device *dev = NULL;
1812 struct in_device *idev = NULL;
1813
1814 if (imr->imr_ifindex) {
1815 idev = inetdev_by_index(net, imr->imr_ifindex);
1816 return idev;
1817 }
1818 if (imr->imr_address.s_addr) {
1819 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1820 if (!dev)
1821 return NULL;
1822 }
1823
1824 if (!dev) {
1825 struct rtable *rt = ip_route_output(net,
1826 imr->imr_multiaddr.s_addr,
1827 0, 0, 0);
1828 if (!IS_ERR(rt)) {
1829 dev = rt->dst.dev;
1830 ip_rt_put(rt);
1831 }
1832 }
1833 if (dev) {
1834 imr->imr_ifindex = dev->ifindex;
1835 idev = __in_dev_get_rtnl(dev);
1836 }
1837 return idev;
1838 }
1839
1840 /*
1841 * Join a socket to a group
1842 */
1843
1844 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1845 __be32 *psfsrc)
1846 {
1847 struct ip_sf_list *psf, *psf_prev;
1848 int rv = 0;
1849
1850 psf_prev = NULL;
1851 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1852 if (psf->sf_inaddr == *psfsrc)
1853 break;
1854 psf_prev = psf;
1855 }
1856 if (!psf || psf->sf_count[sfmode] == 0) {
1857 /* source filter not found, or count wrong => bug */
1858 return -ESRCH;
1859 }
1860 psf->sf_count[sfmode]--;
1861 if (psf->sf_count[sfmode] == 0) {
1862 ip_rt_multicast_event(pmc->interface);
1863 }
1864 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1865 #ifdef CONFIG_IP_MULTICAST
1866 struct in_device *in_dev = pmc->interface;
1867 struct net *net = dev_net(in_dev->dev);
1868 #endif
1869
1870 /* no more filters for this source */
1871 if (psf_prev)
1872 psf_prev->sf_next = psf->sf_next;
1873 else
1874 pmc->sources = psf->sf_next;
1875 #ifdef CONFIG_IP_MULTICAST
1876 if (psf->sf_oldin &&
1877 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1878 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1879 psf->sf_next = pmc->tomb;
1880 pmc->tomb = psf;
1881 rv = 1;
1882 } else
1883 #endif
1884 kfree(psf);
1885 }
1886 return rv;
1887 }
1888
1889 #ifndef CONFIG_IP_MULTICAST
1890 #define igmp_ifc_event(x) do { } while (0)
1891 #endif
1892
1893 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1894 int sfcount, __be32 *psfsrc, int delta)
1895 {
1896 struct ip_mc_list *pmc;
1897 int changerec = 0;
1898 int i, err;
1899
1900 if (!in_dev)
1901 return -ENODEV;
1902 rcu_read_lock();
1903 for_each_pmc_rcu(in_dev, pmc) {
1904 if (*pmca == pmc->multiaddr)
1905 break;
1906 }
1907 if (!pmc) {
1908 /* MCA not found?? bug */
1909 rcu_read_unlock();
1910 return -ESRCH;
1911 }
1912 spin_lock_bh(&pmc->lock);
1913 rcu_read_unlock();
1914 #ifdef CONFIG_IP_MULTICAST
1915 sf_markstate(pmc);
1916 #endif
1917 if (!delta) {
1918 err = -EINVAL;
1919 if (!pmc->sfcount[sfmode])
1920 goto out_unlock;
1921 pmc->sfcount[sfmode]--;
1922 }
1923 err = 0;
1924 for (i = 0; i < sfcount; i++) {
1925 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1926
1927 changerec |= rv > 0;
1928 if (!err && rv < 0)
1929 err = rv;
1930 }
1931 if (pmc->sfmode == MCAST_EXCLUDE &&
1932 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1933 pmc->sfcount[MCAST_INCLUDE]) {
1934 #ifdef CONFIG_IP_MULTICAST
1935 struct ip_sf_list *psf;
1936 struct net *net = dev_net(in_dev->dev);
1937 #endif
1938
1939 /* filter mode change */
1940 pmc->sfmode = MCAST_INCLUDE;
1941 #ifdef CONFIG_IP_MULTICAST
1942 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1943 in_dev->mr_ifc_count = pmc->crcount;
1944 for (psf = pmc->sources; psf; psf = psf->sf_next)
1945 psf->sf_crcount = 0;
1946 igmp_ifc_event(pmc->interface);
1947 } else if (sf_setstate(pmc) || changerec) {
1948 igmp_ifc_event(pmc->interface);
1949 #endif
1950 }
1951 out_unlock:
1952 spin_unlock_bh(&pmc->lock);
1953 return err;
1954 }
1955
1956 /*
1957 * Add multicast single-source filter to the interface list
1958 */
1959 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1960 __be32 *psfsrc)
1961 {
1962 struct ip_sf_list *psf, *psf_prev;
1963
1964 psf_prev = NULL;
1965 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1966 if (psf->sf_inaddr == *psfsrc)
1967 break;
1968 psf_prev = psf;
1969 }
1970 if (!psf) {
1971 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1972 if (!psf)
1973 return -ENOBUFS;
1974 psf->sf_inaddr = *psfsrc;
1975 if (psf_prev) {
1976 psf_prev->sf_next = psf;
1977 } else
1978 pmc->sources = psf;
1979 }
1980 psf->sf_count[sfmode]++;
1981 if (psf->sf_count[sfmode] == 1) {
1982 ip_rt_multicast_event(pmc->interface);
1983 }
1984 return 0;
1985 }
1986
1987 #ifdef CONFIG_IP_MULTICAST
1988 static void sf_markstate(struct ip_mc_list *pmc)
1989 {
1990 struct ip_sf_list *psf;
1991 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1992
1993 for (psf = pmc->sources; psf; psf = psf->sf_next)
1994 if (pmc->sfcount[MCAST_EXCLUDE]) {
1995 psf->sf_oldin = mca_xcount ==
1996 psf->sf_count[MCAST_EXCLUDE] &&
1997 !psf->sf_count[MCAST_INCLUDE];
1998 } else
1999 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2000 }
2001
2002 static int sf_setstate(struct ip_mc_list *pmc)
2003 {
2004 struct ip_sf_list *psf, *dpsf;
2005 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2006 int qrv = pmc->interface->mr_qrv;
2007 int new_in, rv;
2008
2009 rv = 0;
2010 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2011 if (pmc->sfcount[MCAST_EXCLUDE]) {
2012 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2013 !psf->sf_count[MCAST_INCLUDE];
2014 } else
2015 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2016 if (new_in) {
2017 if (!psf->sf_oldin) {
2018 struct ip_sf_list *prev = NULL;
2019
2020 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
2021 if (dpsf->sf_inaddr == psf->sf_inaddr)
2022 break;
2023 prev = dpsf;
2024 }
2025 if (dpsf) {
2026 if (prev)
2027 prev->sf_next = dpsf->sf_next;
2028 else
2029 pmc->tomb = dpsf->sf_next;
2030 kfree(dpsf);
2031 }
2032 psf->sf_crcount = qrv;
2033 rv++;
2034 }
2035 } else if (psf->sf_oldin) {
2036
2037 psf->sf_crcount = 0;
2038 /*
2039 * add or update "delete" records if an active filter
2040 * is now inactive
2041 */
2042 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2043 if (dpsf->sf_inaddr == psf->sf_inaddr)
2044 break;
2045 if (!dpsf) {
2046 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2047 if (!dpsf)
2048 continue;
2049 *dpsf = *psf;
2050 /* pmc->lock held by callers */
2051 dpsf->sf_next = pmc->tomb;
2052 pmc->tomb = dpsf;
2053 }
2054 dpsf->sf_crcount = qrv;
2055 rv++;
2056 }
2057 }
2058 return rv;
2059 }
2060 #endif
2061
2062 /*
2063 * Add multicast source filter list to the interface list
2064 */
2065 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2066 int sfcount, __be32 *psfsrc, int delta)
2067 {
2068 struct ip_mc_list *pmc;
2069 int isexclude;
2070 int i, err;
2071
2072 if (!in_dev)
2073 return -ENODEV;
2074 rcu_read_lock();
2075 for_each_pmc_rcu(in_dev, pmc) {
2076 if (*pmca == pmc->multiaddr)
2077 break;
2078 }
2079 if (!pmc) {
2080 /* MCA not found?? bug */
2081 rcu_read_unlock();
2082 return -ESRCH;
2083 }
2084 spin_lock_bh(&pmc->lock);
2085 rcu_read_unlock();
2086
2087 #ifdef CONFIG_IP_MULTICAST
2088 sf_markstate(pmc);
2089 #endif
2090 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2091 if (!delta)
2092 pmc->sfcount[sfmode]++;
2093 err = 0;
2094 for (i = 0; i < sfcount; i++) {
2095 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2096 if (err)
2097 break;
2098 }
2099 if (err) {
2100 int j;
2101
2102 if (!delta)
2103 pmc->sfcount[sfmode]--;
2104 for (j = 0; j < i; j++)
2105 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2106 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2107 #ifdef CONFIG_IP_MULTICAST
2108 struct ip_sf_list *psf;
2109 struct net *net = dev_net(pmc->interface->dev);
2110 in_dev = pmc->interface;
2111 #endif
2112
2113 /* filter mode change */
2114 if (pmc->sfcount[MCAST_EXCLUDE])
2115 pmc->sfmode = MCAST_EXCLUDE;
2116 else if (pmc->sfcount[MCAST_INCLUDE])
2117 pmc->sfmode = MCAST_INCLUDE;
2118 #ifdef CONFIG_IP_MULTICAST
2119 /* else no filters; keep old mode for reports */
2120
2121 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2122 in_dev->mr_ifc_count = pmc->crcount;
2123 for (psf = pmc->sources; psf; psf = psf->sf_next)
2124 psf->sf_crcount = 0;
2125 igmp_ifc_event(in_dev);
2126 } else if (sf_setstate(pmc)) {
2127 igmp_ifc_event(in_dev);
2128 #endif
2129 }
2130 spin_unlock_bh(&pmc->lock);
2131 return err;
2132 }
2133
2134 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2135 {
2136 struct ip_sf_list *tomb, *sources;
2137
2138 spin_lock_bh(&pmc->lock);
2139 tomb = pmc->tomb;
2140 pmc->tomb = NULL;
2141 sources = pmc->sources;
2142 pmc->sources = NULL;
2143 pmc->sfmode = MCAST_EXCLUDE;
2144 pmc->sfcount[MCAST_INCLUDE] = 0;
2145 pmc->sfcount[MCAST_EXCLUDE] = 1;
2146 spin_unlock_bh(&pmc->lock);
2147
2148 ip_sf_list_clear_all(tomb);
2149 ip_sf_list_clear_all(sources);
2150 }
2151
2152 /* Join a multicast group
2153 */
2154 static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
2155 unsigned int mode)
2156 {
2157 __be32 addr = imr->imr_multiaddr.s_addr;
2158 struct ip_mc_socklist *iml, *i;
2159 struct in_device *in_dev;
2160 struct inet_sock *inet = inet_sk(sk);
2161 struct net *net = sock_net(sk);
2162 int ifindex;
2163 int count = 0;
2164 int err;
2165
2166 ASSERT_RTNL();
2167
2168 if (!ipv4_is_multicast(addr))
2169 return -EINVAL;
2170
2171 in_dev = ip_mc_find_dev(net, imr);
2172
2173 if (!in_dev) {
2174 err = -ENODEV;
2175 goto done;
2176 }
2177
2178 err = -EADDRINUSE;
2179 ifindex = imr->imr_ifindex;
2180 for_each_pmc_rtnl(inet, i) {
2181 if (i->multi.imr_multiaddr.s_addr == addr &&
2182 i->multi.imr_ifindex == ifindex)
2183 goto done;
2184 count++;
2185 }
2186 err = -ENOBUFS;
2187 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2188 goto done;
2189 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2190 if (!iml)
2191 goto done;
2192
2193 memcpy(&iml->multi, imr, sizeof(*imr));
2194 iml->next_rcu = inet->mc_list;
2195 iml->sflist = NULL;
2196 iml->sfmode = mode;
2197 rcu_assign_pointer(inet->mc_list, iml);
2198 ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL);
2199 err = 0;
2200 done:
2201 return err;
2202 }
2203
2204 /* Join ASM (Any-Source Multicast) group
2205 */
2206 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2207 {
2208 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
2209 }
2210 EXPORT_SYMBOL(ip_mc_join_group);
2211
2212 /* Join SSM (Source-Specific Multicast) group
2213 */
2214 int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
2215 unsigned int mode)
2216 {
2217 return __ip_mc_join_group(sk, imr, mode);
2218 }
2219
2220 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2221 struct in_device *in_dev)
2222 {
2223 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2224 int err;
2225
2226 if (!psf) {
2227 /* any-source empty exclude case */
2228 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2229 iml->sfmode, 0, NULL, 0);
2230 }
2231 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2232 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2233 RCU_INIT_POINTER(iml->sflist, NULL);
2234 /* decrease mem now to avoid the memleak warning */
2235 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2236 kfree_rcu(psf, rcu);
2237 return err;
2238 }
2239
2240 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2241 {
2242 struct inet_sock *inet = inet_sk(sk);
2243 struct ip_mc_socklist *iml;
2244 struct ip_mc_socklist __rcu **imlp;
2245 struct in_device *in_dev;
2246 struct net *net = sock_net(sk);
2247 __be32 group = imr->imr_multiaddr.s_addr;
2248 u32 ifindex;
2249 int ret = -EADDRNOTAVAIL;
2250
2251 ASSERT_RTNL();
2252
2253 in_dev = ip_mc_find_dev(net, imr);
2254 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2255 ret = -ENODEV;
2256 goto out;
2257 }
2258 ifindex = imr->imr_ifindex;
2259 for (imlp = &inet->mc_list;
2260 (iml = rtnl_dereference(*imlp)) != NULL;
2261 imlp = &iml->next_rcu) {
2262 if (iml->multi.imr_multiaddr.s_addr != group)
2263 continue;
2264 if (ifindex) {
2265 if (iml->multi.imr_ifindex != ifindex)
2266 continue;
2267 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2268 iml->multi.imr_address.s_addr)
2269 continue;
2270
2271 (void) ip_mc_leave_src(sk, iml, in_dev);
2272
2273 *imlp = iml->next_rcu;
2274
2275 if (in_dev)
2276 ip_mc_dec_group(in_dev, group);
2277
2278 /* decrease mem now to avoid the memleak warning */
2279 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2280 kfree_rcu(iml, rcu);
2281 return 0;
2282 }
2283 out:
2284 return ret;
2285 }
2286 EXPORT_SYMBOL(ip_mc_leave_group);
2287
2288 int ip_mc_source(int add, int omode, struct sock *sk, struct
2289 ip_mreq_source *mreqs, int ifindex)
2290 {
2291 int err;
2292 struct ip_mreqn imr;
2293 __be32 addr = mreqs->imr_multiaddr;
2294 struct ip_mc_socklist *pmc;
2295 struct in_device *in_dev = NULL;
2296 struct inet_sock *inet = inet_sk(sk);
2297 struct ip_sf_socklist *psl;
2298 struct net *net = sock_net(sk);
2299 int leavegroup = 0;
2300 int i, j, rv;
2301
2302 if (!ipv4_is_multicast(addr))
2303 return -EINVAL;
2304
2305 ASSERT_RTNL();
2306
2307 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2308 imr.imr_address.s_addr = mreqs->imr_interface;
2309 imr.imr_ifindex = ifindex;
2310 in_dev = ip_mc_find_dev(net, &imr);
2311
2312 if (!in_dev) {
2313 err = -ENODEV;
2314 goto done;
2315 }
2316 err = -EADDRNOTAVAIL;
2317
2318 for_each_pmc_rtnl(inet, pmc) {
2319 if ((pmc->multi.imr_multiaddr.s_addr ==
2320 imr.imr_multiaddr.s_addr) &&
2321 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2322 break;
2323 }
2324 if (!pmc) { /* must have a prior join */
2325 err = -EINVAL;
2326 goto done;
2327 }
2328 /* if a source filter was set, must be the same mode as before */
2329 if (pmc->sflist) {
2330 if (pmc->sfmode != omode) {
2331 err = -EINVAL;
2332 goto done;
2333 }
2334 } else if (pmc->sfmode != omode) {
2335 /* allow mode switches for empty-set filters */
2336 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2337 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2338 NULL, 0);
2339 pmc->sfmode = omode;
2340 }
2341
2342 psl = rtnl_dereference(pmc->sflist);
2343 if (!add) {
2344 if (!psl)
2345 goto done; /* err = -EADDRNOTAVAIL */
2346 rv = !0;
2347 for (i = 0; i < psl->sl_count; i++) {
2348 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2349 sizeof(__be32));
2350 if (rv == 0)
2351 break;
2352 }
2353 if (rv) /* source not found */
2354 goto done; /* err = -EADDRNOTAVAIL */
2355
2356 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2357 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2358 leavegroup = 1;
2359 goto done;
2360 }
2361
2362 /* update the interface filter */
2363 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2364 &mreqs->imr_sourceaddr, 1);
2365
2366 for (j = i+1; j < psl->sl_count; j++)
2367 psl->sl_addr[j-1] = psl->sl_addr[j];
2368 psl->sl_count--;
2369 err = 0;
2370 goto done;
2371 }
2372 /* else, add a new source to the filter */
2373
2374 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2375 err = -ENOBUFS;
2376 goto done;
2377 }
2378 if (!psl || psl->sl_count == psl->sl_max) {
2379 struct ip_sf_socklist *newpsl;
2380 int count = IP_SFBLOCK;
2381
2382 if (psl)
2383 count += psl->sl_max;
2384 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2385 if (!newpsl) {
2386 err = -ENOBUFS;
2387 goto done;
2388 }
2389 newpsl->sl_max = count;
2390 newpsl->sl_count = count - IP_SFBLOCK;
2391 if (psl) {
2392 for (i = 0; i < psl->sl_count; i++)
2393 newpsl->sl_addr[i] = psl->sl_addr[i];
2394 /* decrease mem now to avoid the memleak warning */
2395 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2396 kfree_rcu(psl, rcu);
2397 }
2398 rcu_assign_pointer(pmc->sflist, newpsl);
2399 psl = newpsl;
2400 }
2401 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2402 for (i = 0; i < psl->sl_count; i++) {
2403 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2404 sizeof(__be32));
2405 if (rv == 0)
2406 break;
2407 }
2408 if (rv == 0) /* address already there is an error */
2409 goto done;
2410 for (j = psl->sl_count-1; j >= i; j--)
2411 psl->sl_addr[j+1] = psl->sl_addr[j];
2412 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2413 psl->sl_count++;
2414 err = 0;
2415 /* update the interface list */
2416 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2417 &mreqs->imr_sourceaddr, 1);
2418 done:
2419 if (leavegroup)
2420 err = ip_mc_leave_group(sk, &imr);
2421 return err;
2422 }
2423
2424 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2425 {
2426 int err = 0;
2427 struct ip_mreqn imr;
2428 __be32 addr = msf->imsf_multiaddr;
2429 struct ip_mc_socklist *pmc;
2430 struct in_device *in_dev;
2431 struct inet_sock *inet = inet_sk(sk);
2432 struct ip_sf_socklist *newpsl, *psl;
2433 struct net *net = sock_net(sk);
2434 int leavegroup = 0;
2435
2436 if (!ipv4_is_multicast(addr))
2437 return -EINVAL;
2438 if (msf->imsf_fmode != MCAST_INCLUDE &&
2439 msf->imsf_fmode != MCAST_EXCLUDE)
2440 return -EINVAL;
2441
2442 ASSERT_RTNL();
2443
2444 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2445 imr.imr_address.s_addr = msf->imsf_interface;
2446 imr.imr_ifindex = ifindex;
2447 in_dev = ip_mc_find_dev(net, &imr);
2448
2449 if (!in_dev) {
2450 err = -ENODEV;
2451 goto done;
2452 }
2453
2454 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2455 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2456 leavegroup = 1;
2457 goto done;
2458 }
2459
2460 for_each_pmc_rtnl(inet, pmc) {
2461 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2462 pmc->multi.imr_ifindex == imr.imr_ifindex)
2463 break;
2464 }
2465 if (!pmc) { /* must have a prior join */
2466 err = -EINVAL;
2467 goto done;
2468 }
2469 if (msf->imsf_numsrc) {
2470 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2471 GFP_KERNEL);
2472 if (!newpsl) {
2473 err = -ENOBUFS;
2474 goto done;
2475 }
2476 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2477 memcpy(newpsl->sl_addr, msf->imsf_slist,
2478 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2479 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2480 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2481 if (err) {
2482 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2483 goto done;
2484 }
2485 } else {
2486 newpsl = NULL;
2487 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2488 msf->imsf_fmode, 0, NULL, 0);
2489 }
2490 psl = rtnl_dereference(pmc->sflist);
2491 if (psl) {
2492 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2493 psl->sl_count, psl->sl_addr, 0);
2494 /* decrease mem now to avoid the memleak warning */
2495 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2496 kfree_rcu(psl, rcu);
2497 } else
2498 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2499 0, NULL, 0);
2500 rcu_assign_pointer(pmc->sflist, newpsl);
2501 pmc->sfmode = msf->imsf_fmode;
2502 err = 0;
2503 done:
2504 if (leavegroup)
2505 err = ip_mc_leave_group(sk, &imr);
2506 return err;
2507 }
2508
2509 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2510 struct ip_msfilter __user *optval, int __user *optlen)
2511 {
2512 int err, len, count, copycount;
2513 struct ip_mreqn imr;
2514 __be32 addr = msf->imsf_multiaddr;
2515 struct ip_mc_socklist *pmc;
2516 struct in_device *in_dev;
2517 struct inet_sock *inet = inet_sk(sk);
2518 struct ip_sf_socklist *psl;
2519 struct net *net = sock_net(sk);
2520
2521 ASSERT_RTNL();
2522
2523 if (!ipv4_is_multicast(addr))
2524 return -EINVAL;
2525
2526 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2527 imr.imr_address.s_addr = msf->imsf_interface;
2528 imr.imr_ifindex = 0;
2529 in_dev = ip_mc_find_dev(net, &imr);
2530
2531 if (!in_dev) {
2532 err = -ENODEV;
2533 goto done;
2534 }
2535 err = -EADDRNOTAVAIL;
2536
2537 for_each_pmc_rtnl(inet, pmc) {
2538 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2539 pmc->multi.imr_ifindex == imr.imr_ifindex)
2540 break;
2541 }
2542 if (!pmc) /* must have a prior join */
2543 goto done;
2544 msf->imsf_fmode = pmc->sfmode;
2545 psl = rtnl_dereference(pmc->sflist);
2546 if (!psl) {
2547 len = 0;
2548 count = 0;
2549 } else {
2550 count = psl->sl_count;
2551 }
2552 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2553 len = copycount * sizeof(psl->sl_addr[0]);
2554 msf->imsf_numsrc = count;
2555 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2556 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2557 return -EFAULT;
2558 }
2559 if (len &&
2560 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2561 return -EFAULT;
2562 return 0;
2563 done:
2564 return err;
2565 }
2566
2567 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2568 struct group_filter __user *optval, int __user *optlen)
2569 {
2570 int err, i, count, copycount;
2571 struct sockaddr_in *psin;
2572 __be32 addr;
2573 struct ip_mc_socklist *pmc;
2574 struct inet_sock *inet = inet_sk(sk);
2575 struct ip_sf_socklist *psl;
2576
2577 ASSERT_RTNL();
2578
2579 psin = (struct sockaddr_in *)&gsf->gf_group;
2580 if (psin->sin_family != AF_INET)
2581 return -EINVAL;
2582 addr = psin->sin_addr.s_addr;
2583 if (!ipv4_is_multicast(addr))
2584 return -EINVAL;
2585
2586 err = -EADDRNOTAVAIL;
2587
2588 for_each_pmc_rtnl(inet, pmc) {
2589 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2590 pmc->multi.imr_ifindex == gsf->gf_interface)
2591 break;
2592 }
2593 if (!pmc) /* must have a prior join */
2594 goto done;
2595 gsf->gf_fmode = pmc->sfmode;
2596 psl = rtnl_dereference(pmc->sflist);
2597 count = psl ? psl->sl_count : 0;
2598 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2599 gsf->gf_numsrc = count;
2600 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2601 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2602 return -EFAULT;
2603 }
2604 for (i = 0; i < copycount; i++) {
2605 struct sockaddr_storage ss;
2606
2607 psin = (struct sockaddr_in *)&ss;
2608 memset(&ss, 0, sizeof(ss));
2609 psin->sin_family = AF_INET;
2610 psin->sin_addr.s_addr = psl->sl_addr[i];
2611 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2612 return -EFAULT;
2613 }
2614 return 0;
2615 done:
2616 return err;
2617 }
2618
2619 /*
2620 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2621 */
2622 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2623 int dif, int sdif)
2624 {
2625 struct inet_sock *inet = inet_sk(sk);
2626 struct ip_mc_socklist *pmc;
2627 struct ip_sf_socklist *psl;
2628 int i;
2629 int ret;
2630
2631 ret = 1;
2632 if (!ipv4_is_multicast(loc_addr))
2633 goto out;
2634
2635 rcu_read_lock();
2636 for_each_pmc_rcu(inet, pmc) {
2637 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2638 (pmc->multi.imr_ifindex == dif ||
2639 (sdif && pmc->multi.imr_ifindex == sdif)))
2640 break;
2641 }
2642 ret = inet->mc_all;
2643 if (!pmc)
2644 goto unlock;
2645 psl = rcu_dereference(pmc->sflist);
2646 ret = (pmc->sfmode == MCAST_EXCLUDE);
2647 if (!psl)
2648 goto unlock;
2649
2650 for (i = 0; i < psl->sl_count; i++) {
2651 if (psl->sl_addr[i] == rmt_addr)
2652 break;
2653 }
2654 ret = 0;
2655 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2656 goto unlock;
2657 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2658 goto unlock;
2659 ret = 1;
2660 unlock:
2661 rcu_read_unlock();
2662 out:
2663 return ret;
2664 }
2665
2666 /*
2667 * A socket is closing.
2668 */
2669
2670 void ip_mc_drop_socket(struct sock *sk)
2671 {
2672 struct inet_sock *inet = inet_sk(sk);
2673 struct ip_mc_socklist *iml;
2674 struct net *net = sock_net(sk);
2675
2676 if (!inet->mc_list)
2677 return;
2678
2679 rtnl_lock();
2680 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2681 struct in_device *in_dev;
2682
2683 inet->mc_list = iml->next_rcu;
2684 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2685 (void) ip_mc_leave_src(sk, iml, in_dev);
2686 if (in_dev)
2687 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2688 /* decrease mem now to avoid the memleak warning */
2689 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2690 kfree_rcu(iml, rcu);
2691 }
2692 rtnl_unlock();
2693 }
2694
2695 /* called with rcu_read_lock() */
2696 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2697 {
2698 struct ip_mc_list *im;
2699 struct ip_mc_list __rcu **mc_hash;
2700 struct ip_sf_list *psf;
2701 int rv = 0;
2702
2703 mc_hash = rcu_dereference(in_dev->mc_hash);
2704 if (mc_hash) {
2705 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2706
2707 for (im = rcu_dereference(mc_hash[hash]);
2708 im != NULL;
2709 im = rcu_dereference(im->next_hash)) {
2710 if (im->multiaddr == mc_addr)
2711 break;
2712 }
2713 } else {
2714 for_each_pmc_rcu(in_dev, im) {
2715 if (im->multiaddr == mc_addr)
2716 break;
2717 }
2718 }
2719 if (im && proto == IPPROTO_IGMP) {
2720 rv = 1;
2721 } else if (im) {
2722 if (src_addr) {
2723 for (psf = im->sources; psf; psf = psf->sf_next) {
2724 if (psf->sf_inaddr == src_addr)
2725 break;
2726 }
2727 if (psf)
2728 rv = psf->sf_count[MCAST_INCLUDE] ||
2729 psf->sf_count[MCAST_EXCLUDE] !=
2730 im->sfcount[MCAST_EXCLUDE];
2731 else
2732 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2733 } else
2734 rv = 1; /* unspecified source; tentatively allow */
2735 }
2736 return rv;
2737 }
2738
2739 #if defined(CONFIG_PROC_FS)
2740 struct igmp_mc_iter_state {
2741 struct seq_net_private p;
2742 struct net_device *dev;
2743 struct in_device *in_dev;
2744 };
2745
2746 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2747
2748 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2749 {
2750 struct net *net = seq_file_net(seq);
2751 struct ip_mc_list *im = NULL;
2752 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2753
2754 state->in_dev = NULL;
2755 for_each_netdev_rcu(net, state->dev) {
2756 struct in_device *in_dev;
2757
2758 in_dev = __in_dev_get_rcu(state->dev);
2759 if (!in_dev)
2760 continue;
2761 im = rcu_dereference(in_dev->mc_list);
2762 if (im) {
2763 state->in_dev = in_dev;
2764 break;
2765 }
2766 }
2767 return im;
2768 }
2769
2770 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2771 {
2772 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2773
2774 im = rcu_dereference(im->next_rcu);
2775 while (!im) {
2776 state->dev = next_net_device_rcu(state->dev);
2777 if (!state->dev) {
2778 state->in_dev = NULL;
2779 break;
2780 }
2781 state->in_dev = __in_dev_get_rcu(state->dev);
2782 if (!state->in_dev)
2783 continue;
2784 im = rcu_dereference(state->in_dev->mc_list);
2785 }
2786 return im;
2787 }
2788
2789 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2790 {
2791 struct ip_mc_list *im = igmp_mc_get_first(seq);
2792 if (im)
2793 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2794 --pos;
2795 return pos ? NULL : im;
2796 }
2797
2798 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2799 __acquires(rcu)
2800 {
2801 rcu_read_lock();
2802 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2803 }
2804
2805 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2806 {
2807 struct ip_mc_list *im;
2808 if (v == SEQ_START_TOKEN)
2809 im = igmp_mc_get_first(seq);
2810 else
2811 im = igmp_mc_get_next(seq, v);
2812 ++*pos;
2813 return im;
2814 }
2815
2816 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2817 __releases(rcu)
2818 {
2819 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2820
2821 state->in_dev = NULL;
2822 state->dev = NULL;
2823 rcu_read_unlock();
2824 }
2825
2826 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2827 {
2828 if (v == SEQ_START_TOKEN)
2829 seq_puts(seq,
2830 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2831 else {
2832 struct ip_mc_list *im = (struct ip_mc_list *)v;
2833 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2834 char *querier;
2835 long delta;
2836
2837 #ifdef CONFIG_IP_MULTICAST
2838 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2839 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2840 "V3";
2841 #else
2842 querier = "NONE";
2843 #endif
2844
2845 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2846 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2847 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2848 }
2849
2850 delta = im->timer.expires - jiffies;
2851 seq_printf(seq,
2852 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2853 im->multiaddr, im->users,
2854 im->tm_running,
2855 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2856 im->reporter);
2857 }
2858 return 0;
2859 }
2860
2861 static const struct seq_operations igmp_mc_seq_ops = {
2862 .start = igmp_mc_seq_start,
2863 .next = igmp_mc_seq_next,
2864 .stop = igmp_mc_seq_stop,
2865 .show = igmp_mc_seq_show,
2866 };
2867
2868 struct igmp_mcf_iter_state {
2869 struct seq_net_private p;
2870 struct net_device *dev;
2871 struct in_device *idev;
2872 struct ip_mc_list *im;
2873 };
2874
2875 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2876
2877 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2878 {
2879 struct net *net = seq_file_net(seq);
2880 struct ip_sf_list *psf = NULL;
2881 struct ip_mc_list *im = NULL;
2882 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2883
2884 state->idev = NULL;
2885 state->im = NULL;
2886 for_each_netdev_rcu(net, state->dev) {
2887 struct in_device *idev;
2888 idev = __in_dev_get_rcu(state->dev);
2889 if (unlikely(!idev))
2890 continue;
2891 im = rcu_dereference(idev->mc_list);
2892 if (likely(im)) {
2893 spin_lock_bh(&im->lock);
2894 psf = im->sources;
2895 if (likely(psf)) {
2896 state->im = im;
2897 state->idev = idev;
2898 break;
2899 }
2900 spin_unlock_bh(&im->lock);
2901 }
2902 }
2903 return psf;
2904 }
2905
2906 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2907 {
2908 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2909
2910 psf = psf->sf_next;
2911 while (!psf) {
2912 spin_unlock_bh(&state->im->lock);
2913 state->im = state->im->next;
2914 while (!state->im) {
2915 state->dev = next_net_device_rcu(state->dev);
2916 if (!state->dev) {
2917 state->idev = NULL;
2918 goto out;
2919 }
2920 state->idev = __in_dev_get_rcu(state->dev);
2921 if (!state->idev)
2922 continue;
2923 state->im = rcu_dereference(state->idev->mc_list);
2924 }
2925 if (!state->im)
2926 break;
2927 spin_lock_bh(&state->im->lock);
2928 psf = state->im->sources;
2929 }
2930 out:
2931 return psf;
2932 }
2933
2934 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2935 {
2936 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2937 if (psf)
2938 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2939 --pos;
2940 return pos ? NULL : psf;
2941 }
2942
2943 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2944 __acquires(rcu)
2945 {
2946 rcu_read_lock();
2947 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2948 }
2949
2950 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2951 {
2952 struct ip_sf_list *psf;
2953 if (v == SEQ_START_TOKEN)
2954 psf = igmp_mcf_get_first(seq);
2955 else
2956 psf = igmp_mcf_get_next(seq, v);
2957 ++*pos;
2958 return psf;
2959 }
2960
2961 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2962 __releases(rcu)
2963 {
2964 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2965 if (likely(state->im)) {
2966 spin_unlock_bh(&state->im->lock);
2967 state->im = NULL;
2968 }
2969 state->idev = NULL;
2970 state->dev = NULL;
2971 rcu_read_unlock();
2972 }
2973
2974 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2975 {
2976 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2977 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2978
2979 if (v == SEQ_START_TOKEN) {
2980 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2981 } else {
2982 seq_printf(seq,
2983 "%3d %6.6s 0x%08x "
2984 "0x%08x %6lu %6lu\n",
2985 state->dev->ifindex, state->dev->name,
2986 ntohl(state->im->multiaddr),
2987 ntohl(psf->sf_inaddr),
2988 psf->sf_count[MCAST_INCLUDE],
2989 psf->sf_count[MCAST_EXCLUDE]);
2990 }
2991 return 0;
2992 }
2993
2994 static const struct seq_operations igmp_mcf_seq_ops = {
2995 .start = igmp_mcf_seq_start,
2996 .next = igmp_mcf_seq_next,
2997 .stop = igmp_mcf_seq_stop,
2998 .show = igmp_mcf_seq_show,
2999 };
3000
3001 static int __net_init igmp_net_init(struct net *net)
3002 {
3003 struct proc_dir_entry *pde;
3004 int err;
3005
3006 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
3007 sizeof(struct igmp_mc_iter_state));
3008 if (!pde)
3009 goto out_igmp;
3010 pde = proc_create_net("mcfilter", 0444, net->proc_net,
3011 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
3012 if (!pde)
3013 goto out_mcfilter;
3014 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3015 SOCK_DGRAM, 0, net);
3016 if (err < 0) {
3017 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3018 err);
3019 goto out_sock;
3020 }
3021
3022 return 0;
3023
3024 out_sock:
3025 remove_proc_entry("mcfilter", net->proc_net);
3026 out_mcfilter:
3027 remove_proc_entry("igmp", net->proc_net);
3028 out_igmp:
3029 return -ENOMEM;
3030 }
3031
3032 static void __net_exit igmp_net_exit(struct net *net)
3033 {
3034 remove_proc_entry("mcfilter", net->proc_net);
3035 remove_proc_entry("igmp", net->proc_net);
3036 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3037 }
3038
3039 static struct pernet_operations igmp_net_ops = {
3040 .init = igmp_net_init,
3041 .exit = igmp_net_exit,
3042 };
3043 #endif
3044
3045 static int igmp_netdev_event(struct notifier_block *this,
3046 unsigned long event, void *ptr)
3047 {
3048 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3049 struct in_device *in_dev;
3050
3051 switch (event) {
3052 case NETDEV_RESEND_IGMP:
3053 in_dev = __in_dev_get_rtnl(dev);
3054 if (in_dev)
3055 ip_mc_rejoin_groups(in_dev);
3056 break;
3057 default:
3058 break;
3059 }
3060 return NOTIFY_DONE;
3061 }
3062
3063 static struct notifier_block igmp_notifier = {
3064 .notifier_call = igmp_netdev_event,
3065 };
3066
3067 int __init igmp_mc_init(void)
3068 {
3069 #if defined(CONFIG_PROC_FS)
3070 int err;
3071
3072 err = register_pernet_subsys(&igmp_net_ops);
3073 if (err)
3074 return err;
3075 err = register_netdevice_notifier(&igmp_notifier);
3076 if (err)
3077 goto reg_notif_fail;
3078 return 0;
3079
3080 reg_notif_fail:
3081 unregister_pernet_subsys(&igmp_net_ops);
3082 return err;
3083 #else
3084 return register_netdevice_notifier(&igmp_notifier);
3085 #endif
3086 }
Linux with added FPC-III support