Loading...
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_RO(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_RO(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
133static 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
156static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
157 gfp_t gfp);
158static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
159static void igmpv3_clear_delrec(struct in_device *in_dev);
160static int sf_setstate(struct ip_mc_list *pmc);
161static void sf_markstate(struct ip_mc_list *pmc);
162#endif
163static void ip_mc_clear_src(struct ip_mc_list *pmc);
164static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
165 int sfcount, __be32 *psfsrc, int delta);
166
167static 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
185static 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
202static 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 */
214static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
215{
216 int tv = get_random_u32_below(max_delay);
217
218 im->tm_running = 1;
219 if (refcount_inc_not_zero(&im->refcnt)) {
220 if (mod_timer(&im->timer, jiffies + tv + 2))
221 ip_ma_put(im);
222 }
223}
224
225static void igmp_gq_start_timer(struct in_device *in_dev)
226{
227 int tv = get_random_u32_below(in_dev->mr_maxdelay);
228 unsigned long exp = jiffies + tv + 2;
229
230 if (in_dev->mr_gq_running &&
231 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
232 return;
233
234 in_dev->mr_gq_running = 1;
235 if (!mod_timer(&in_dev->mr_gq_timer, exp))
236 in_dev_hold(in_dev);
237}
238
239static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
240{
241 int tv = get_random_u32_below(delay);
242
243 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
244 in_dev_hold(in_dev);
245}
246
247static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
248{
249 spin_lock_bh(&im->lock);
250 im->unsolicit_count = 0;
251 if (del_timer(&im->timer)) {
252 if ((long)(im->timer.expires-jiffies) < max_delay) {
253 add_timer(&im->timer);
254 im->tm_running = 1;
255 spin_unlock_bh(&im->lock);
256 return;
257 }
258 refcount_dec(&im->refcnt);
259 }
260 igmp_start_timer(im, max_delay);
261 spin_unlock_bh(&im->lock);
262}
263
264
265/*
266 * Send an IGMP report.
267 */
268
269#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
270
271
272static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
273 int gdeleted, int sdeleted)
274{
275 switch (type) {
276 case IGMPV3_MODE_IS_INCLUDE:
277 case IGMPV3_MODE_IS_EXCLUDE:
278 if (gdeleted || sdeleted)
279 return 0;
280 if (!(pmc->gsquery && !psf->sf_gsresp)) {
281 if (pmc->sfmode == MCAST_INCLUDE)
282 return 1;
283 /* don't include if this source is excluded
284 * in all filters
285 */
286 if (psf->sf_count[MCAST_INCLUDE])
287 return type == IGMPV3_MODE_IS_INCLUDE;
288 return pmc->sfcount[MCAST_EXCLUDE] ==
289 psf->sf_count[MCAST_EXCLUDE];
290 }
291 return 0;
292 case IGMPV3_CHANGE_TO_INCLUDE:
293 if (gdeleted || sdeleted)
294 return 0;
295 return psf->sf_count[MCAST_INCLUDE] != 0;
296 case IGMPV3_CHANGE_TO_EXCLUDE:
297 if (gdeleted || sdeleted)
298 return 0;
299 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
300 psf->sf_count[MCAST_INCLUDE])
301 return 0;
302 return pmc->sfcount[MCAST_EXCLUDE] ==
303 psf->sf_count[MCAST_EXCLUDE];
304 case IGMPV3_ALLOW_NEW_SOURCES:
305 if (gdeleted || !psf->sf_crcount)
306 return 0;
307 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
308 case IGMPV3_BLOCK_OLD_SOURCES:
309 if (pmc->sfmode == MCAST_INCLUDE)
310 return gdeleted || (psf->sf_crcount && sdeleted);
311 return psf->sf_crcount && !gdeleted && !sdeleted;
312 }
313 return 0;
314}
315
316static int
317igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
318{
319 struct ip_sf_list *psf;
320 int scount = 0;
321
322 for (psf = pmc->sources; psf; psf = psf->sf_next) {
323 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
324 continue;
325 scount++;
326 }
327 return scount;
328}
329
330/* source address selection per RFC 3376 section 4.2.13 */
331static __be32 igmpv3_get_srcaddr(struct net_device *dev,
332 const struct flowi4 *fl4)
333{
334 struct in_device *in_dev = __in_dev_get_rcu(dev);
335 const struct in_ifaddr *ifa;
336
337 if (!in_dev)
338 return htonl(INADDR_ANY);
339
340 in_dev_for_each_ifa_rcu(ifa, in_dev) {
341 if (fl4->saddr == ifa->ifa_local)
342 return fl4->saddr;
343 }
344
345 return htonl(INADDR_ANY);
346}
347
348static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
349{
350 struct sk_buff *skb;
351 struct rtable *rt;
352 struct iphdr *pip;
353 struct igmpv3_report *pig;
354 struct net *net = dev_net(dev);
355 struct flowi4 fl4;
356 int hlen = LL_RESERVED_SPACE(dev);
357 int tlen = dev->needed_tailroom;
358 unsigned int size;
359
360 size = min(mtu, IP_MAX_MTU);
361 while (1) {
362 skb = alloc_skb(size + hlen + tlen,
363 GFP_ATOMIC | __GFP_NOWARN);
364 if (skb)
365 break;
366 size >>= 1;
367 if (size < 256)
368 return NULL;
369 }
370 skb->priority = TC_PRIO_CONTROL;
371
372 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
373 0, 0,
374 IPPROTO_IGMP, 0, dev->ifindex);
375 if (IS_ERR(rt)) {
376 kfree_skb(skb);
377 return NULL;
378 }
379
380 skb_dst_set(skb, &rt->dst);
381 skb->dev = dev;
382
383 skb_reserve(skb, hlen);
384 skb_tailroom_reserve(skb, mtu, tlen);
385
386 skb_reset_network_header(skb);
387 pip = ip_hdr(skb);
388 skb_put(skb, sizeof(struct iphdr) + 4);
389
390 pip->version = 4;
391 pip->ihl = (sizeof(struct iphdr)+4)>>2;
392 pip->tos = 0xc0;
393 pip->frag_off = htons(IP_DF);
394 pip->ttl = 1;
395 pip->daddr = fl4.daddr;
396
397 rcu_read_lock();
398 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
399 rcu_read_unlock();
400
401 pip->protocol = IPPROTO_IGMP;
402 pip->tot_len = 0; /* filled in later */
403 ip_select_ident(net, skb, NULL);
404 ((u8 *)&pip[1])[0] = IPOPT_RA;
405 ((u8 *)&pip[1])[1] = 4;
406 ((u8 *)&pip[1])[2] = 0;
407 ((u8 *)&pip[1])[3] = 0;
408
409 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
410 skb_put(skb, sizeof(*pig));
411 pig = igmpv3_report_hdr(skb);
412 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
413 pig->resv1 = 0;
414 pig->csum = 0;
415 pig->resv2 = 0;
416 pig->ngrec = 0;
417 return skb;
418}
419
420static int igmpv3_sendpack(struct sk_buff *skb)
421{
422 struct igmphdr *pig = igmp_hdr(skb);
423 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
424
425 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
426
427 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
428}
429
430static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
431{
432 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
433}
434
435static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
436 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
437{
438 struct net_device *dev = pmc->interface->dev;
439 struct igmpv3_report *pih;
440 struct igmpv3_grec *pgr;
441
442 if (!skb) {
443 skb = igmpv3_newpack(dev, mtu);
444 if (!skb)
445 return NULL;
446 }
447 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
448 pgr->grec_type = type;
449 pgr->grec_auxwords = 0;
450 pgr->grec_nsrcs = 0;
451 pgr->grec_mca = pmc->multiaddr;
452 pih = igmpv3_report_hdr(skb);
453 pih->ngrec = htons(ntohs(pih->ngrec)+1);
454 *ppgr = pgr;
455 return skb;
456}
457
458#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
459
460static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
461 int type, int gdeleted, int sdeleted)
462{
463 struct net_device *dev = pmc->interface->dev;
464 struct net *net = dev_net(dev);
465 struct igmpv3_report *pih;
466 struct igmpv3_grec *pgr = NULL;
467 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
468 int scount, stotal, first, isquery, truncate;
469 unsigned int mtu;
470
471 if (pmc->multiaddr == IGMP_ALL_HOSTS)
472 return skb;
473 if (ipv4_is_local_multicast(pmc->multiaddr) &&
474 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
475 return skb;
476
477 mtu = READ_ONCE(dev->mtu);
478 if (mtu < IPV4_MIN_MTU)
479 return skb;
480
481 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
482 type == IGMPV3_MODE_IS_EXCLUDE;
483 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
484 type == IGMPV3_CHANGE_TO_EXCLUDE;
485
486 stotal = scount = 0;
487
488 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
489
490 if (!*psf_list)
491 goto empty_source;
492
493 pih = skb ? igmpv3_report_hdr(skb) : NULL;
494
495 /* EX and TO_EX get a fresh packet, if needed */
496 if (truncate) {
497 if (pih && pih->ngrec &&
498 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
499 if (skb)
500 igmpv3_sendpack(skb);
501 skb = igmpv3_newpack(dev, mtu);
502 }
503 }
504 first = 1;
505 psf_prev = NULL;
506 for (psf = *psf_list; psf; psf = psf_next) {
507 __be32 *psrc;
508
509 psf_next = psf->sf_next;
510
511 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
512 psf_prev = psf;
513 continue;
514 }
515
516 /* Based on RFC3376 5.1. Should not send source-list change
517 * records when there is a filter mode change.
518 */
519 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
520 (!gdeleted && pmc->crcount)) &&
521 (type == IGMPV3_ALLOW_NEW_SOURCES ||
522 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
523 goto decrease_sf_crcount;
524
525 /* clear marks on query responses */
526 if (isquery)
527 psf->sf_gsresp = 0;
528
529 if (AVAILABLE(skb) < sizeof(__be32) +
530 first*sizeof(struct igmpv3_grec)) {
531 if (truncate && !first)
532 break; /* truncate these */
533 if (pgr)
534 pgr->grec_nsrcs = htons(scount);
535 if (skb)
536 igmpv3_sendpack(skb);
537 skb = igmpv3_newpack(dev, mtu);
538 first = 1;
539 scount = 0;
540 }
541 if (first) {
542 skb = add_grhead(skb, pmc, type, &pgr, mtu);
543 first = 0;
544 }
545 if (!skb)
546 return NULL;
547 psrc = skb_put(skb, sizeof(__be32));
548 *psrc = psf->sf_inaddr;
549 scount++; stotal++;
550 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
551 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
552decrease_sf_crcount:
553 psf->sf_crcount--;
554 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
555 if (psf_prev)
556 psf_prev->sf_next = psf->sf_next;
557 else
558 *psf_list = psf->sf_next;
559 kfree(psf);
560 continue;
561 }
562 }
563 psf_prev = psf;
564 }
565
566empty_source:
567 if (!stotal) {
568 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
569 type == IGMPV3_BLOCK_OLD_SOURCES)
570 return skb;
571 if (pmc->crcount || isquery) {
572 /* make sure we have room for group header */
573 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
574 igmpv3_sendpack(skb);
575 skb = NULL; /* add_grhead will get a new one */
576 }
577 skb = add_grhead(skb, pmc, type, &pgr, mtu);
578 }
579 }
580 if (pgr)
581 pgr->grec_nsrcs = htons(scount);
582
583 if (isquery)
584 pmc->gsquery = 0; /* clear query state on report */
585 return skb;
586}
587
588static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
589{
590 struct sk_buff *skb = NULL;
591 struct net *net = dev_net(in_dev->dev);
592 int type;
593
594 if (!pmc) {
595 rcu_read_lock();
596 for_each_pmc_rcu(in_dev, pmc) {
597 if (pmc->multiaddr == IGMP_ALL_HOSTS)
598 continue;
599 if (ipv4_is_local_multicast(pmc->multiaddr) &&
600 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
601 continue;
602 spin_lock_bh(&pmc->lock);
603 if (pmc->sfcount[MCAST_EXCLUDE])
604 type = IGMPV3_MODE_IS_EXCLUDE;
605 else
606 type = IGMPV3_MODE_IS_INCLUDE;
607 skb = add_grec(skb, pmc, type, 0, 0);
608 spin_unlock_bh(&pmc->lock);
609 }
610 rcu_read_unlock();
611 } else {
612 spin_lock_bh(&pmc->lock);
613 if (pmc->sfcount[MCAST_EXCLUDE])
614 type = IGMPV3_MODE_IS_EXCLUDE;
615 else
616 type = IGMPV3_MODE_IS_INCLUDE;
617 skb = add_grec(skb, pmc, type, 0, 0);
618 spin_unlock_bh(&pmc->lock);
619 }
620 if (!skb)
621 return 0;
622 return igmpv3_sendpack(skb);
623}
624
625/*
626 * remove zero-count source records from a source filter list
627 */
628static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
629{
630 struct ip_sf_list *psf_prev, *psf_next, *psf;
631
632 psf_prev = NULL;
633 for (psf = *ppsf; psf; psf = psf_next) {
634 psf_next = psf->sf_next;
635 if (psf->sf_crcount == 0) {
636 if (psf_prev)
637 psf_prev->sf_next = psf->sf_next;
638 else
639 *ppsf = psf->sf_next;
640 kfree(psf);
641 } else
642 psf_prev = psf;
643 }
644}
645
646static void kfree_pmc(struct ip_mc_list *pmc)
647{
648 ip_sf_list_clear_all(pmc->sources);
649 ip_sf_list_clear_all(pmc->tomb);
650 kfree(pmc);
651}
652
653static void igmpv3_send_cr(struct in_device *in_dev)
654{
655 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
656 struct sk_buff *skb = NULL;
657 int type, dtype;
658
659 rcu_read_lock();
660 spin_lock_bh(&in_dev->mc_tomb_lock);
661
662 /* deleted MCA's */
663 pmc_prev = NULL;
664 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
665 pmc_next = pmc->next;
666 if (pmc->sfmode == MCAST_INCLUDE) {
667 type = IGMPV3_BLOCK_OLD_SOURCES;
668 dtype = IGMPV3_BLOCK_OLD_SOURCES;
669 skb = add_grec(skb, pmc, type, 1, 0);
670 skb = add_grec(skb, pmc, dtype, 1, 1);
671 }
672 if (pmc->crcount) {
673 if (pmc->sfmode == MCAST_EXCLUDE) {
674 type = IGMPV3_CHANGE_TO_INCLUDE;
675 skb = add_grec(skb, pmc, type, 1, 0);
676 }
677 pmc->crcount--;
678 if (pmc->crcount == 0) {
679 igmpv3_clear_zeros(&pmc->tomb);
680 igmpv3_clear_zeros(&pmc->sources);
681 }
682 }
683 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
684 if (pmc_prev)
685 pmc_prev->next = pmc_next;
686 else
687 in_dev->mc_tomb = pmc_next;
688 in_dev_put(pmc->interface);
689 kfree_pmc(pmc);
690 } else
691 pmc_prev = pmc;
692 }
693 spin_unlock_bh(&in_dev->mc_tomb_lock);
694
695 /* change recs */
696 for_each_pmc_rcu(in_dev, pmc) {
697 spin_lock_bh(&pmc->lock);
698 if (pmc->sfcount[MCAST_EXCLUDE]) {
699 type = IGMPV3_BLOCK_OLD_SOURCES;
700 dtype = IGMPV3_ALLOW_NEW_SOURCES;
701 } else {
702 type = IGMPV3_ALLOW_NEW_SOURCES;
703 dtype = IGMPV3_BLOCK_OLD_SOURCES;
704 }
705 skb = add_grec(skb, pmc, type, 0, 0);
706 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
707
708 /* filter mode changes */
709 if (pmc->crcount) {
710 if (pmc->sfmode == MCAST_EXCLUDE)
711 type = IGMPV3_CHANGE_TO_EXCLUDE;
712 else
713 type = IGMPV3_CHANGE_TO_INCLUDE;
714 skb = add_grec(skb, pmc, type, 0, 0);
715 pmc->crcount--;
716 }
717 spin_unlock_bh(&pmc->lock);
718 }
719 rcu_read_unlock();
720
721 if (!skb)
722 return;
723 (void) igmpv3_sendpack(skb);
724}
725
726static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
727 int type)
728{
729 struct sk_buff *skb;
730 struct iphdr *iph;
731 struct igmphdr *ih;
732 struct rtable *rt;
733 struct net_device *dev = in_dev->dev;
734 struct net *net = dev_net(dev);
735 __be32 group = pmc ? pmc->multiaddr : 0;
736 struct flowi4 fl4;
737 __be32 dst;
738 int hlen, tlen;
739
740 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
741 return igmpv3_send_report(in_dev, pmc);
742
743 if (ipv4_is_local_multicast(group) &&
744 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
745 return 0;
746
747 if (type == IGMP_HOST_LEAVE_MESSAGE)
748 dst = IGMP_ALL_ROUTER;
749 else
750 dst = group;
751
752 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
753 0, 0,
754 IPPROTO_IGMP, 0, dev->ifindex);
755 if (IS_ERR(rt))
756 return -1;
757
758 hlen = LL_RESERVED_SPACE(dev);
759 tlen = dev->needed_tailroom;
760 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
761 if (!skb) {
762 ip_rt_put(rt);
763 return -1;
764 }
765 skb->priority = TC_PRIO_CONTROL;
766
767 skb_dst_set(skb, &rt->dst);
768
769 skb_reserve(skb, hlen);
770
771 skb_reset_network_header(skb);
772 iph = ip_hdr(skb);
773 skb_put(skb, sizeof(struct iphdr) + 4);
774
775 iph->version = 4;
776 iph->ihl = (sizeof(struct iphdr)+4)>>2;
777 iph->tos = 0xc0;
778 iph->frag_off = htons(IP_DF);
779 iph->ttl = 1;
780 iph->daddr = dst;
781 iph->saddr = fl4.saddr;
782 iph->protocol = IPPROTO_IGMP;
783 ip_select_ident(net, skb, NULL);
784 ((u8 *)&iph[1])[0] = IPOPT_RA;
785 ((u8 *)&iph[1])[1] = 4;
786 ((u8 *)&iph[1])[2] = 0;
787 ((u8 *)&iph[1])[3] = 0;
788
789 ih = skb_put(skb, sizeof(struct igmphdr));
790 ih->type = type;
791 ih->code = 0;
792 ih->csum = 0;
793 ih->group = group;
794 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
795
796 return ip_local_out(net, skb->sk, skb);
797}
798
799static void igmp_gq_timer_expire(struct timer_list *t)
800{
801 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
802
803 in_dev->mr_gq_running = 0;
804 igmpv3_send_report(in_dev, NULL);
805 in_dev_put(in_dev);
806}
807
808static void igmp_ifc_timer_expire(struct timer_list *t)
809{
810 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
811 u32 mr_ifc_count;
812
813 igmpv3_send_cr(in_dev);
814restart:
815 mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count);
816
817 if (mr_ifc_count) {
818 if (cmpxchg(&in_dev->mr_ifc_count,
819 mr_ifc_count,
820 mr_ifc_count - 1) != mr_ifc_count)
821 goto restart;
822 igmp_ifc_start_timer(in_dev,
823 unsolicited_report_interval(in_dev));
824 }
825 in_dev_put(in_dev);
826}
827
828static void igmp_ifc_event(struct in_device *in_dev)
829{
830 struct net *net = dev_net(in_dev->dev);
831 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
832 return;
833 WRITE_ONCE(in_dev->mr_ifc_count, in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv));
834 igmp_ifc_start_timer(in_dev, 1);
835}
836
837
838static void igmp_timer_expire(struct timer_list *t)
839{
840 struct ip_mc_list *im = from_timer(im, t, timer);
841 struct in_device *in_dev = im->interface;
842
843 spin_lock(&im->lock);
844 im->tm_running = 0;
845
846 if (im->unsolicit_count && --im->unsolicit_count)
847 igmp_start_timer(im, unsolicited_report_interval(in_dev));
848
849 im->reporter = 1;
850 spin_unlock(&im->lock);
851
852 if (IGMP_V1_SEEN(in_dev))
853 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
854 else if (IGMP_V2_SEEN(in_dev))
855 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
856 else
857 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
858
859 ip_ma_put(im);
860}
861
862/* mark EXCLUDE-mode sources */
863static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
864{
865 struct ip_sf_list *psf;
866 int i, scount;
867
868 scount = 0;
869 for (psf = pmc->sources; psf; psf = psf->sf_next) {
870 if (scount == nsrcs)
871 break;
872 for (i = 0; i < nsrcs; i++) {
873 /* skip inactive filters */
874 if (psf->sf_count[MCAST_INCLUDE] ||
875 pmc->sfcount[MCAST_EXCLUDE] !=
876 psf->sf_count[MCAST_EXCLUDE])
877 break;
878 if (srcs[i] == psf->sf_inaddr) {
879 scount++;
880 break;
881 }
882 }
883 }
884 pmc->gsquery = 0;
885 if (scount == nsrcs) /* all sources excluded */
886 return 0;
887 return 1;
888}
889
890static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
891{
892 struct ip_sf_list *psf;
893 int i, scount;
894
895 if (pmc->sfmode == MCAST_EXCLUDE)
896 return igmp_xmarksources(pmc, nsrcs, srcs);
897
898 /* mark INCLUDE-mode sources */
899 scount = 0;
900 for (psf = pmc->sources; psf; psf = psf->sf_next) {
901 if (scount == nsrcs)
902 break;
903 for (i = 0; i < nsrcs; i++)
904 if (srcs[i] == psf->sf_inaddr) {
905 psf->sf_gsresp = 1;
906 scount++;
907 break;
908 }
909 }
910 if (!scount) {
911 pmc->gsquery = 0;
912 return 0;
913 }
914 pmc->gsquery = 1;
915 return 1;
916}
917
918/* return true if packet was dropped */
919static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
920{
921 struct ip_mc_list *im;
922 struct net *net = dev_net(in_dev->dev);
923
924 /* Timers are only set for non-local groups */
925
926 if (group == IGMP_ALL_HOSTS)
927 return false;
928 if (ipv4_is_local_multicast(group) &&
929 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
930 return false;
931
932 rcu_read_lock();
933 for_each_pmc_rcu(in_dev, im) {
934 if (im->multiaddr == group) {
935 igmp_stop_timer(im);
936 break;
937 }
938 }
939 rcu_read_unlock();
940 return false;
941}
942
943/* return true if packet was dropped */
944static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
945 int len)
946{
947 struct igmphdr *ih = igmp_hdr(skb);
948 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
949 struct ip_mc_list *im;
950 __be32 group = ih->group;
951 int max_delay;
952 int mark = 0;
953 struct net *net = dev_net(in_dev->dev);
954
955
956 if (len == 8) {
957 if (ih->code == 0) {
958 /* Alas, old v1 router presents here. */
959
960 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
961 in_dev->mr_v1_seen = jiffies +
962 (in_dev->mr_qrv * in_dev->mr_qi) +
963 in_dev->mr_qri;
964 group = 0;
965 } else {
966 /* v2 router present */
967 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
968 in_dev->mr_v2_seen = jiffies +
969 (in_dev->mr_qrv * in_dev->mr_qi) +
970 in_dev->mr_qri;
971 }
972 /* cancel the interface change timer */
973 WRITE_ONCE(in_dev->mr_ifc_count, 0);
974 if (del_timer(&in_dev->mr_ifc_timer))
975 __in_dev_put(in_dev);
976 /* clear deleted report items */
977 igmpv3_clear_delrec(in_dev);
978 } else if (len < 12) {
979 return true; /* ignore bogus packet; freed by caller */
980 } else if (IGMP_V1_SEEN(in_dev)) {
981 /* This is a v3 query with v1 queriers present */
982 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
983 group = 0;
984 } else if (IGMP_V2_SEEN(in_dev)) {
985 /* this is a v3 query with v2 queriers present;
986 * Interpretation of the max_delay code is problematic here.
987 * A real v2 host would use ih_code directly, while v3 has a
988 * different encoding. We use the v3 encoding as more likely
989 * to be intended in a v3 query.
990 */
991 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
992 if (!max_delay)
993 max_delay = 1; /* can't mod w/ 0 */
994 } else { /* v3 */
995 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
996 return true;
997
998 ih3 = igmpv3_query_hdr(skb);
999 if (ih3->nsrcs) {
1000 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
1001 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1002 return true;
1003 ih3 = igmpv3_query_hdr(skb);
1004 }
1005
1006 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
1007 if (!max_delay)
1008 max_delay = 1; /* can't mod w/ 0 */
1009 in_dev->mr_maxdelay = max_delay;
1010
1011 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
1012 * received value was zero, use the default or statically
1013 * configured value.
1014 */
1015 in_dev->mr_qrv = ih3->qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1016 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL;
1017
1018 /* RFC3376, 8.3. Query Response Interval:
1019 * The number of seconds represented by the [Query Response
1020 * Interval] must be less than the [Query Interval].
1021 */
1022 if (in_dev->mr_qri >= in_dev->mr_qi)
1023 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ;
1024
1025 if (!group) { /* general query */
1026 if (ih3->nsrcs)
1027 return true; /* no sources allowed */
1028 igmp_gq_start_timer(in_dev);
1029 return false;
1030 }
1031 /* mark sources to include, if group & source-specific */
1032 mark = ih3->nsrcs != 0;
1033 }
1034
1035 /*
1036 * - Start the timers in all of our membership records
1037 * that the query applies to for the interface on
1038 * which the query arrived excl. those that belong
1039 * to a "local" group (224.0.0.X)
1040 * - For timers already running check if they need to
1041 * be reset.
1042 * - Use the igmp->igmp_code field as the maximum
1043 * delay possible
1044 */
1045 rcu_read_lock();
1046 for_each_pmc_rcu(in_dev, im) {
1047 int changed;
1048
1049 if (group && group != im->multiaddr)
1050 continue;
1051 if (im->multiaddr == IGMP_ALL_HOSTS)
1052 continue;
1053 if (ipv4_is_local_multicast(im->multiaddr) &&
1054 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1055 continue;
1056 spin_lock_bh(&im->lock);
1057 if (im->tm_running)
1058 im->gsquery = im->gsquery && mark;
1059 else
1060 im->gsquery = mark;
1061 changed = !im->gsquery ||
1062 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1063 spin_unlock_bh(&im->lock);
1064 if (changed)
1065 igmp_mod_timer(im, max_delay);
1066 }
1067 rcu_read_unlock();
1068 return false;
1069}
1070
1071/* called in rcu_read_lock() section */
1072int igmp_rcv(struct sk_buff *skb)
1073{
1074 /* This basically follows the spec line by line -- see RFC1112 */
1075 struct igmphdr *ih;
1076 struct net_device *dev = skb->dev;
1077 struct in_device *in_dev;
1078 int len = skb->len;
1079 bool dropped = true;
1080
1081 if (netif_is_l3_master(dev)) {
1082 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1083 if (!dev)
1084 goto drop;
1085 }
1086
1087 in_dev = __in_dev_get_rcu(dev);
1088 if (!in_dev)
1089 goto drop;
1090
1091 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1092 goto drop;
1093
1094 if (skb_checksum_simple_validate(skb))
1095 goto drop;
1096
1097 ih = igmp_hdr(skb);
1098 switch (ih->type) {
1099 case IGMP_HOST_MEMBERSHIP_QUERY:
1100 dropped = igmp_heard_query(in_dev, skb, len);
1101 break;
1102 case IGMP_HOST_MEMBERSHIP_REPORT:
1103 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1104 /* Is it our report looped back? */
1105 if (rt_is_output_route(skb_rtable(skb)))
1106 break;
1107 /* don't rely on MC router hearing unicast reports */
1108 if (skb->pkt_type == PACKET_MULTICAST ||
1109 skb->pkt_type == PACKET_BROADCAST)
1110 dropped = igmp_heard_report(in_dev, ih->group);
1111 break;
1112 case IGMP_PIM:
1113#ifdef CONFIG_IP_PIMSM_V1
1114 return pim_rcv_v1(skb);
1115#endif
1116 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1117 case IGMP_DVMRP:
1118 case IGMP_TRACE:
1119 case IGMP_HOST_LEAVE_MESSAGE:
1120 case IGMP_MTRACE:
1121 case IGMP_MTRACE_RESP:
1122 break;
1123 default:
1124 break;
1125 }
1126
1127drop:
1128 if (dropped)
1129 kfree_skb(skb);
1130 else
1131 consume_skb(skb);
1132 return 0;
1133}
1134
1135#endif
1136
1137
1138/*
1139 * Add a filter to a device
1140 */
1141
1142static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1143{
1144 char buf[MAX_ADDR_LEN];
1145 struct net_device *dev = in_dev->dev;
1146
1147 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1148 We will get multicast token leakage, when IFF_MULTICAST
1149 is changed. This check should be done in ndo_set_rx_mode
1150 routine. Something sort of:
1151 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1152 --ANK
1153 */
1154 if (arp_mc_map(addr, buf, dev, 0) == 0)
1155 dev_mc_add(dev, buf);
1156}
1157
1158/*
1159 * Remove a filter from a device
1160 */
1161
1162static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1163{
1164 char buf[MAX_ADDR_LEN];
1165 struct net_device *dev = in_dev->dev;
1166
1167 if (arp_mc_map(addr, buf, dev, 0) == 0)
1168 dev_mc_del(dev, buf);
1169}
1170
1171#ifdef CONFIG_IP_MULTICAST
1172/*
1173 * deleted ip_mc_list manipulation
1174 */
1175static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
1176 gfp_t gfp)
1177{
1178 struct ip_mc_list *pmc;
1179 struct net *net = dev_net(in_dev->dev);
1180
1181 /* this is an "ip_mc_list" for convenience; only the fields below
1182 * are actually used. In particular, the refcnt and users are not
1183 * used for management of the delete list. Using the same structure
1184 * for deleted items allows change reports to use common code with
1185 * non-deleted or query-response MCA's.
1186 */
1187 pmc = kzalloc(sizeof(*pmc), gfp);
1188 if (!pmc)
1189 return;
1190 spin_lock_init(&pmc->lock);
1191 spin_lock_bh(&im->lock);
1192 pmc->interface = im->interface;
1193 in_dev_hold(in_dev);
1194 pmc->multiaddr = im->multiaddr;
1195 pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1196 pmc->sfmode = im->sfmode;
1197 if (pmc->sfmode == MCAST_INCLUDE) {
1198 struct ip_sf_list *psf;
1199
1200 pmc->tomb = im->tomb;
1201 pmc->sources = im->sources;
1202 im->tomb = im->sources = NULL;
1203 for (psf = pmc->sources; psf; psf = psf->sf_next)
1204 psf->sf_crcount = pmc->crcount;
1205 }
1206 spin_unlock_bh(&im->lock);
1207
1208 spin_lock_bh(&in_dev->mc_tomb_lock);
1209 pmc->next = in_dev->mc_tomb;
1210 in_dev->mc_tomb = pmc;
1211 spin_unlock_bh(&in_dev->mc_tomb_lock);
1212}
1213
1214/*
1215 * restore ip_mc_list deleted records
1216 */
1217static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1218{
1219 struct ip_mc_list *pmc, *pmc_prev;
1220 struct ip_sf_list *psf;
1221 struct net *net = dev_net(in_dev->dev);
1222 __be32 multiaddr = im->multiaddr;
1223
1224 spin_lock_bh(&in_dev->mc_tomb_lock);
1225 pmc_prev = NULL;
1226 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1227 if (pmc->multiaddr == multiaddr)
1228 break;
1229 pmc_prev = pmc;
1230 }
1231 if (pmc) {
1232 if (pmc_prev)
1233 pmc_prev->next = pmc->next;
1234 else
1235 in_dev->mc_tomb = pmc->next;
1236 }
1237 spin_unlock_bh(&in_dev->mc_tomb_lock);
1238
1239 spin_lock_bh(&im->lock);
1240 if (pmc) {
1241 im->interface = pmc->interface;
1242 if (im->sfmode == MCAST_INCLUDE) {
1243 swap(im->tomb, pmc->tomb);
1244 swap(im->sources, pmc->sources);
1245 for (psf = im->sources; psf; psf = psf->sf_next)
1246 psf->sf_crcount = in_dev->mr_qrv ?:
1247 READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1248 } else {
1249 im->crcount = in_dev->mr_qrv ?:
1250 READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1251 }
1252 in_dev_put(pmc->interface);
1253 kfree_pmc(pmc);
1254 }
1255 spin_unlock_bh(&im->lock);
1256}
1257
1258/*
1259 * flush ip_mc_list deleted records
1260 */
1261static void igmpv3_clear_delrec(struct in_device *in_dev)
1262{
1263 struct ip_mc_list *pmc, *nextpmc;
1264
1265 spin_lock_bh(&in_dev->mc_tomb_lock);
1266 pmc = in_dev->mc_tomb;
1267 in_dev->mc_tomb = NULL;
1268 spin_unlock_bh(&in_dev->mc_tomb_lock);
1269
1270 for (; pmc; pmc = nextpmc) {
1271 nextpmc = pmc->next;
1272 ip_mc_clear_src(pmc);
1273 in_dev_put(pmc->interface);
1274 kfree_pmc(pmc);
1275 }
1276 /* clear dead sources, too */
1277 rcu_read_lock();
1278 for_each_pmc_rcu(in_dev, pmc) {
1279 struct ip_sf_list *psf;
1280
1281 spin_lock_bh(&pmc->lock);
1282 psf = pmc->tomb;
1283 pmc->tomb = NULL;
1284 spin_unlock_bh(&pmc->lock);
1285 ip_sf_list_clear_all(psf);
1286 }
1287 rcu_read_unlock();
1288}
1289#endif
1290
1291static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp)
1292{
1293 struct in_device *in_dev = im->interface;
1294#ifdef CONFIG_IP_MULTICAST
1295 struct net *net = dev_net(in_dev->dev);
1296 int reporter;
1297#endif
1298
1299 if (im->loaded) {
1300 im->loaded = 0;
1301 ip_mc_filter_del(in_dev, im->multiaddr);
1302 }
1303
1304#ifdef CONFIG_IP_MULTICAST
1305 if (im->multiaddr == IGMP_ALL_HOSTS)
1306 return;
1307 if (ipv4_is_local_multicast(im->multiaddr) &&
1308 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1309 return;
1310
1311 reporter = im->reporter;
1312 igmp_stop_timer(im);
1313
1314 if (!in_dev->dead) {
1315 if (IGMP_V1_SEEN(in_dev))
1316 return;
1317 if (IGMP_V2_SEEN(in_dev)) {
1318 if (reporter)
1319 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1320 return;
1321 }
1322 /* IGMPv3 */
1323 igmpv3_add_delrec(in_dev, im, gfp);
1324
1325 igmp_ifc_event(in_dev);
1326 }
1327#endif
1328}
1329
1330static void igmp_group_dropped(struct ip_mc_list *im)
1331{
1332 __igmp_group_dropped(im, GFP_KERNEL);
1333}
1334
1335static void igmp_group_added(struct ip_mc_list *im)
1336{
1337 struct in_device *in_dev = im->interface;
1338#ifdef CONFIG_IP_MULTICAST
1339 struct net *net = dev_net(in_dev->dev);
1340#endif
1341
1342 if (im->loaded == 0) {
1343 im->loaded = 1;
1344 ip_mc_filter_add(in_dev, im->multiaddr);
1345 }
1346
1347#ifdef CONFIG_IP_MULTICAST
1348 if (im->multiaddr == IGMP_ALL_HOSTS)
1349 return;
1350 if (ipv4_is_local_multicast(im->multiaddr) &&
1351 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1352 return;
1353
1354 if (in_dev->dead)
1355 return;
1356
1357 im->unsolicit_count = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1358 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1359 spin_lock_bh(&im->lock);
1360 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1361 spin_unlock_bh(&im->lock);
1362 return;
1363 }
1364 /* else, v3 */
1365
1366 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
1367 * not send filter-mode change record as the mode should be from
1368 * IN() to IN(A).
1369 */
1370 if (im->sfmode == MCAST_EXCLUDE)
1371 im->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1372
1373 igmp_ifc_event(in_dev);
1374#endif
1375}
1376
1377
1378/*
1379 * Multicast list managers
1380 */
1381
1382static u32 ip_mc_hash(const struct ip_mc_list *im)
1383{
1384 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1385}
1386
1387static void ip_mc_hash_add(struct in_device *in_dev,
1388 struct ip_mc_list *im)
1389{
1390 struct ip_mc_list __rcu **mc_hash;
1391 u32 hash;
1392
1393 mc_hash = rtnl_dereference(in_dev->mc_hash);
1394 if (mc_hash) {
1395 hash = ip_mc_hash(im);
1396 im->next_hash = mc_hash[hash];
1397 rcu_assign_pointer(mc_hash[hash], im);
1398 return;
1399 }
1400
1401 /* do not use a hash table for small number of items */
1402 if (in_dev->mc_count < 4)
1403 return;
1404
1405 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1406 GFP_KERNEL);
1407 if (!mc_hash)
1408 return;
1409
1410 for_each_pmc_rtnl(in_dev, im) {
1411 hash = ip_mc_hash(im);
1412 im->next_hash = mc_hash[hash];
1413 RCU_INIT_POINTER(mc_hash[hash], im);
1414 }
1415
1416 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1417}
1418
1419static void ip_mc_hash_remove(struct in_device *in_dev,
1420 struct ip_mc_list *im)
1421{
1422 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1423 struct ip_mc_list *aux;
1424
1425 if (!mc_hash)
1426 return;
1427 mc_hash += ip_mc_hash(im);
1428 while ((aux = rtnl_dereference(*mc_hash)) != im)
1429 mc_hash = &aux->next_hash;
1430 *mc_hash = im->next_hash;
1431}
1432
1433
1434/*
1435 * A socket has joined a multicast group on device dev.
1436 */
1437static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
1438 unsigned int mode, gfp_t gfp)
1439{
1440 struct ip_mc_list __rcu **mc_hash;
1441 struct ip_mc_list *im;
1442
1443 ASSERT_RTNL();
1444
1445 mc_hash = rtnl_dereference(in_dev->mc_hash);
1446 if (mc_hash) {
1447 u32 hash = hash_32((__force u32)addr, MC_HASH_SZ_LOG);
1448
1449 for (im = rtnl_dereference(mc_hash[hash]);
1450 im;
1451 im = rtnl_dereference(im->next_hash)) {
1452 if (im->multiaddr == addr)
1453 break;
1454 }
1455 } else {
1456 for_each_pmc_rtnl(in_dev, im) {
1457 if (im->multiaddr == addr)
1458 break;
1459 }
1460 }
1461
1462 if (im) {
1463 im->users++;
1464 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
1465 goto out;
1466 }
1467
1468 im = kzalloc(sizeof(*im), gfp);
1469 if (!im)
1470 goto out;
1471
1472 im->users = 1;
1473 im->interface = in_dev;
1474 in_dev_hold(in_dev);
1475 im->multiaddr = addr;
1476 /* initial mode is (EX, empty) */
1477 im->sfmode = mode;
1478 im->sfcount[mode] = 1;
1479 refcount_set(&im->refcnt, 1);
1480 spin_lock_init(&im->lock);
1481#ifdef CONFIG_IP_MULTICAST
1482 timer_setup(&im->timer, igmp_timer_expire, 0);
1483#endif
1484
1485 im->next_rcu = in_dev->mc_list;
1486 in_dev->mc_count++;
1487 rcu_assign_pointer(in_dev->mc_list, im);
1488
1489 ip_mc_hash_add(in_dev, im);
1490
1491#ifdef CONFIG_IP_MULTICAST
1492 igmpv3_del_delrec(in_dev, im);
1493#endif
1494 igmp_group_added(im);
1495 if (!in_dev->dead)
1496 ip_rt_multicast_event(in_dev);
1497out:
1498 return;
1499}
1500
1501void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1502{
1503 ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp);
1504}
1505EXPORT_SYMBOL(__ip_mc_inc_group);
1506
1507void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1508{
1509 __ip_mc_inc_group(in_dev, addr, GFP_KERNEL);
1510}
1511EXPORT_SYMBOL(ip_mc_inc_group);
1512
1513static int ip_mc_check_iphdr(struct sk_buff *skb)
1514{
1515 const struct iphdr *iph;
1516 unsigned int len;
1517 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1518
1519 if (!pskb_may_pull(skb, offset))
1520 return -EINVAL;
1521
1522 iph = ip_hdr(skb);
1523
1524 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1525 return -EINVAL;
1526
1527 offset += ip_hdrlen(skb) - sizeof(*iph);
1528
1529 if (!pskb_may_pull(skb, offset))
1530 return -EINVAL;
1531
1532 iph = ip_hdr(skb);
1533
1534 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1535 return -EINVAL;
1536
1537 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1538 if (skb->len < len || len < offset)
1539 return -EINVAL;
1540
1541 skb_set_transport_header(skb, offset);
1542
1543 return 0;
1544}
1545
1546static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1547{
1548 unsigned int len = skb_transport_offset(skb);
1549
1550 len += sizeof(struct igmpv3_report);
1551
1552 return ip_mc_may_pull(skb, len) ? 0 : -EINVAL;
1553}
1554
1555static int ip_mc_check_igmp_query(struct sk_buff *skb)
1556{
1557 unsigned int transport_len = ip_transport_len(skb);
1558 unsigned int len;
1559
1560 /* IGMPv{1,2}? */
1561 if (transport_len != sizeof(struct igmphdr)) {
1562 /* or IGMPv3? */
1563 if (transport_len < sizeof(struct igmpv3_query))
1564 return -EINVAL;
1565
1566 len = skb_transport_offset(skb) + sizeof(struct igmpv3_query);
1567 if (!ip_mc_may_pull(skb, len))
1568 return -EINVAL;
1569 }
1570
1571 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1572 * all-systems destination addresses (224.0.0.1) for general queries
1573 */
1574 if (!igmp_hdr(skb)->group &&
1575 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1576 return -EINVAL;
1577
1578 return 0;
1579}
1580
1581static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1582{
1583 switch (igmp_hdr(skb)->type) {
1584 case IGMP_HOST_LEAVE_MESSAGE:
1585 case IGMP_HOST_MEMBERSHIP_REPORT:
1586 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1587 return 0;
1588 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1589 return ip_mc_check_igmp_reportv3(skb);
1590 case IGMP_HOST_MEMBERSHIP_QUERY:
1591 return ip_mc_check_igmp_query(skb);
1592 default:
1593 return -ENOMSG;
1594 }
1595}
1596
1597static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1598{
1599 return skb_checksum_simple_validate(skb);
1600}
1601
1602static int ip_mc_check_igmp_csum(struct sk_buff *skb)
1603{
1604 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1605 unsigned int transport_len = ip_transport_len(skb);
1606 struct sk_buff *skb_chk;
1607
1608 if (!ip_mc_may_pull(skb, len))
1609 return -EINVAL;
1610
1611 skb_chk = skb_checksum_trimmed(skb, transport_len,
1612 ip_mc_validate_checksum);
1613 if (!skb_chk)
1614 return -EINVAL;
1615
1616 if (skb_chk != skb)
1617 kfree_skb(skb_chk);
1618
1619 return 0;
1620}
1621
1622/**
1623 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1624 * @skb: the skb to validate
1625 *
1626 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1627 * skb transport header accordingly and returns zero.
1628 *
1629 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1630 * standard
1631 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1632 * -ENOMEM: A memory allocation failure happened.
1633 *
1634 * Caller needs to set the skb network header and free any returned skb if it
1635 * differs from the provided skb.
1636 */
1637int ip_mc_check_igmp(struct sk_buff *skb)
1638{
1639 int ret = ip_mc_check_iphdr(skb);
1640
1641 if (ret < 0)
1642 return ret;
1643
1644 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1645 return -ENOMSG;
1646
1647 ret = ip_mc_check_igmp_csum(skb);
1648 if (ret < 0)
1649 return ret;
1650
1651 return ip_mc_check_igmp_msg(skb);
1652}
1653EXPORT_SYMBOL(ip_mc_check_igmp);
1654
1655/*
1656 * Resend IGMP JOIN report; used by netdev notifier.
1657 */
1658static void ip_mc_rejoin_groups(struct in_device *in_dev)
1659{
1660#ifdef CONFIG_IP_MULTICAST
1661 struct ip_mc_list *im;
1662 int type;
1663 struct net *net = dev_net(in_dev->dev);
1664
1665 ASSERT_RTNL();
1666
1667 for_each_pmc_rtnl(in_dev, im) {
1668 if (im->multiaddr == IGMP_ALL_HOSTS)
1669 continue;
1670 if (ipv4_is_local_multicast(im->multiaddr) &&
1671 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1672 continue;
1673
1674 /* a failover is happening and switches
1675 * must be notified immediately
1676 */
1677 if (IGMP_V1_SEEN(in_dev))
1678 type = IGMP_HOST_MEMBERSHIP_REPORT;
1679 else if (IGMP_V2_SEEN(in_dev))
1680 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1681 else
1682 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1683 igmp_send_report(in_dev, im, type);
1684 }
1685#endif
1686}
1687
1688/*
1689 * A socket has left a multicast group on device dev
1690 */
1691
1692void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1693{
1694 struct ip_mc_list *i;
1695 struct ip_mc_list __rcu **ip;
1696
1697 ASSERT_RTNL();
1698
1699 for (ip = &in_dev->mc_list;
1700 (i = rtnl_dereference(*ip)) != NULL;
1701 ip = &i->next_rcu) {
1702 if (i->multiaddr == addr) {
1703 if (--i->users == 0) {
1704 ip_mc_hash_remove(in_dev, i);
1705 *ip = i->next_rcu;
1706 in_dev->mc_count--;
1707 __igmp_group_dropped(i, gfp);
1708 ip_mc_clear_src(i);
1709
1710 if (!in_dev->dead)
1711 ip_rt_multicast_event(in_dev);
1712
1713 ip_ma_put(i);
1714 return;
1715 }
1716 break;
1717 }
1718 }
1719}
1720EXPORT_SYMBOL(__ip_mc_dec_group);
1721
1722/* Device changing type */
1723
1724void ip_mc_unmap(struct in_device *in_dev)
1725{
1726 struct ip_mc_list *pmc;
1727
1728 ASSERT_RTNL();
1729
1730 for_each_pmc_rtnl(in_dev, pmc)
1731 igmp_group_dropped(pmc);
1732}
1733
1734void ip_mc_remap(struct in_device *in_dev)
1735{
1736 struct ip_mc_list *pmc;
1737
1738 ASSERT_RTNL();
1739
1740 for_each_pmc_rtnl(in_dev, pmc) {
1741#ifdef CONFIG_IP_MULTICAST
1742 igmpv3_del_delrec(in_dev, pmc);
1743#endif
1744 igmp_group_added(pmc);
1745 }
1746}
1747
1748/* Device going down */
1749
1750void ip_mc_down(struct in_device *in_dev)
1751{
1752 struct ip_mc_list *pmc;
1753
1754 ASSERT_RTNL();
1755
1756 for_each_pmc_rtnl(in_dev, pmc)
1757 igmp_group_dropped(pmc);
1758
1759#ifdef CONFIG_IP_MULTICAST
1760 WRITE_ONCE(in_dev->mr_ifc_count, 0);
1761 if (del_timer(&in_dev->mr_ifc_timer))
1762 __in_dev_put(in_dev);
1763 in_dev->mr_gq_running = 0;
1764 if (del_timer(&in_dev->mr_gq_timer))
1765 __in_dev_put(in_dev);
1766#endif
1767
1768 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1769}
1770
1771#ifdef CONFIG_IP_MULTICAST
1772static void ip_mc_reset(struct in_device *in_dev)
1773{
1774 struct net *net = dev_net(in_dev->dev);
1775
1776 in_dev->mr_qi = IGMP_QUERY_INTERVAL;
1777 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
1778 in_dev->mr_qrv = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1779}
1780#else
1781static void ip_mc_reset(struct in_device *in_dev)
1782{
1783}
1784#endif
1785
1786void ip_mc_init_dev(struct in_device *in_dev)
1787{
1788 ASSERT_RTNL();
1789
1790#ifdef CONFIG_IP_MULTICAST
1791 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1792 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1793#endif
1794 ip_mc_reset(in_dev);
1795
1796 spin_lock_init(&in_dev->mc_tomb_lock);
1797}
1798
1799/* Device going up */
1800
1801void ip_mc_up(struct in_device *in_dev)
1802{
1803 struct ip_mc_list *pmc;
1804
1805 ASSERT_RTNL();
1806
1807 ip_mc_reset(in_dev);
1808 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1809
1810 for_each_pmc_rtnl(in_dev, pmc) {
1811#ifdef CONFIG_IP_MULTICAST
1812 igmpv3_del_delrec(in_dev, pmc);
1813#endif
1814 igmp_group_added(pmc);
1815 }
1816}
1817
1818/*
1819 * Device is about to be destroyed: clean up.
1820 */
1821
1822void ip_mc_destroy_dev(struct in_device *in_dev)
1823{
1824 struct ip_mc_list *i;
1825
1826 ASSERT_RTNL();
1827
1828 /* Deactivate timers */
1829 ip_mc_down(in_dev);
1830#ifdef CONFIG_IP_MULTICAST
1831 igmpv3_clear_delrec(in_dev);
1832#endif
1833
1834 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1835 in_dev->mc_list = i->next_rcu;
1836 in_dev->mc_count--;
1837 ip_mc_clear_src(i);
1838 ip_ma_put(i);
1839 }
1840}
1841
1842/* RTNL is locked */
1843static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1844{
1845 struct net_device *dev = NULL;
1846 struct in_device *idev = NULL;
1847
1848 if (imr->imr_ifindex) {
1849 idev = inetdev_by_index(net, imr->imr_ifindex);
1850 return idev;
1851 }
1852 if (imr->imr_address.s_addr) {
1853 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1854 if (!dev)
1855 return NULL;
1856 }
1857
1858 if (!dev) {
1859 struct rtable *rt = ip_route_output(net,
1860 imr->imr_multiaddr.s_addr,
1861 0, 0, 0,
1862 RT_SCOPE_UNIVERSE);
1863 if (!IS_ERR(rt)) {
1864 dev = rt->dst.dev;
1865 ip_rt_put(rt);
1866 }
1867 }
1868 if (dev) {
1869 imr->imr_ifindex = dev->ifindex;
1870 idev = __in_dev_get_rtnl(dev);
1871 }
1872 return idev;
1873}
1874
1875/*
1876 * Join a socket to a group
1877 */
1878
1879static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1880 __be32 *psfsrc)
1881{
1882 struct ip_sf_list *psf, *psf_prev;
1883 int rv = 0;
1884
1885 psf_prev = NULL;
1886 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1887 if (psf->sf_inaddr == *psfsrc)
1888 break;
1889 psf_prev = psf;
1890 }
1891 if (!psf || psf->sf_count[sfmode] == 0) {
1892 /* source filter not found, or count wrong => bug */
1893 return -ESRCH;
1894 }
1895 psf->sf_count[sfmode]--;
1896 if (psf->sf_count[sfmode] == 0) {
1897 ip_rt_multicast_event(pmc->interface);
1898 }
1899 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1900#ifdef CONFIG_IP_MULTICAST
1901 struct in_device *in_dev = pmc->interface;
1902 struct net *net = dev_net(in_dev->dev);
1903#endif
1904
1905 /* no more filters for this source */
1906 if (psf_prev)
1907 psf_prev->sf_next = psf->sf_next;
1908 else
1909 pmc->sources = psf->sf_next;
1910#ifdef CONFIG_IP_MULTICAST
1911 if (psf->sf_oldin &&
1912 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1913 psf->sf_crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1914 psf->sf_next = pmc->tomb;
1915 pmc->tomb = psf;
1916 rv = 1;
1917 } else
1918#endif
1919 kfree(psf);
1920 }
1921 return rv;
1922}
1923
1924#ifndef CONFIG_IP_MULTICAST
1925#define igmp_ifc_event(x) do { } while (0)
1926#endif
1927
1928static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1929 int sfcount, __be32 *psfsrc, int delta)
1930{
1931 struct ip_mc_list *pmc;
1932 int changerec = 0;
1933 int i, err;
1934
1935 if (!in_dev)
1936 return -ENODEV;
1937 rcu_read_lock();
1938 for_each_pmc_rcu(in_dev, pmc) {
1939 if (*pmca == pmc->multiaddr)
1940 break;
1941 }
1942 if (!pmc) {
1943 /* MCA not found?? bug */
1944 rcu_read_unlock();
1945 return -ESRCH;
1946 }
1947 spin_lock_bh(&pmc->lock);
1948 rcu_read_unlock();
1949#ifdef CONFIG_IP_MULTICAST
1950 sf_markstate(pmc);
1951#endif
1952 if (!delta) {
1953 err = -EINVAL;
1954 if (!pmc->sfcount[sfmode])
1955 goto out_unlock;
1956 pmc->sfcount[sfmode]--;
1957 }
1958 err = 0;
1959 for (i = 0; i < sfcount; i++) {
1960 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1961
1962 changerec |= rv > 0;
1963 if (!err && rv < 0)
1964 err = rv;
1965 }
1966 if (pmc->sfmode == MCAST_EXCLUDE &&
1967 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1968 pmc->sfcount[MCAST_INCLUDE]) {
1969#ifdef CONFIG_IP_MULTICAST
1970 struct ip_sf_list *psf;
1971 struct net *net = dev_net(in_dev->dev);
1972#endif
1973
1974 /* filter mode change */
1975 pmc->sfmode = MCAST_INCLUDE;
1976#ifdef CONFIG_IP_MULTICAST
1977 pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1978 WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
1979 for (psf = pmc->sources; psf; psf = psf->sf_next)
1980 psf->sf_crcount = 0;
1981 igmp_ifc_event(pmc->interface);
1982 } else if (sf_setstate(pmc) || changerec) {
1983 igmp_ifc_event(pmc->interface);
1984#endif
1985 }
1986out_unlock:
1987 spin_unlock_bh(&pmc->lock);
1988 return err;
1989}
1990
1991/*
1992 * Add multicast single-source filter to the interface list
1993 */
1994static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1995 __be32 *psfsrc)
1996{
1997 struct ip_sf_list *psf, *psf_prev;
1998
1999 psf_prev = NULL;
2000 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2001 if (psf->sf_inaddr == *psfsrc)
2002 break;
2003 psf_prev = psf;
2004 }
2005 if (!psf) {
2006 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2007 if (!psf)
2008 return -ENOBUFS;
2009 psf->sf_inaddr = *psfsrc;
2010 if (psf_prev) {
2011 psf_prev->sf_next = psf;
2012 } else
2013 pmc->sources = psf;
2014 }
2015 psf->sf_count[sfmode]++;
2016 if (psf->sf_count[sfmode] == 1) {
2017 ip_rt_multicast_event(pmc->interface);
2018 }
2019 return 0;
2020}
2021
2022#ifdef CONFIG_IP_MULTICAST
2023static void sf_markstate(struct ip_mc_list *pmc)
2024{
2025 struct ip_sf_list *psf;
2026 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2027
2028 for (psf = pmc->sources; psf; psf = psf->sf_next)
2029 if (pmc->sfcount[MCAST_EXCLUDE]) {
2030 psf->sf_oldin = mca_xcount ==
2031 psf->sf_count[MCAST_EXCLUDE] &&
2032 !psf->sf_count[MCAST_INCLUDE];
2033 } else
2034 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2035}
2036
2037static int sf_setstate(struct ip_mc_list *pmc)
2038{
2039 struct ip_sf_list *psf, *dpsf;
2040 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2041 int qrv = pmc->interface->mr_qrv;
2042 int new_in, rv;
2043
2044 rv = 0;
2045 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2046 if (pmc->sfcount[MCAST_EXCLUDE]) {
2047 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2048 !psf->sf_count[MCAST_INCLUDE];
2049 } else
2050 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2051 if (new_in) {
2052 if (!psf->sf_oldin) {
2053 struct ip_sf_list *prev = NULL;
2054
2055 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
2056 if (dpsf->sf_inaddr == psf->sf_inaddr)
2057 break;
2058 prev = dpsf;
2059 }
2060 if (dpsf) {
2061 if (prev)
2062 prev->sf_next = dpsf->sf_next;
2063 else
2064 pmc->tomb = dpsf->sf_next;
2065 kfree(dpsf);
2066 }
2067 psf->sf_crcount = qrv;
2068 rv++;
2069 }
2070 } else if (psf->sf_oldin) {
2071
2072 psf->sf_crcount = 0;
2073 /*
2074 * add or update "delete" records if an active filter
2075 * is now inactive
2076 */
2077 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2078 if (dpsf->sf_inaddr == psf->sf_inaddr)
2079 break;
2080 if (!dpsf) {
2081 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2082 if (!dpsf)
2083 continue;
2084 *dpsf = *psf;
2085 /* pmc->lock held by callers */
2086 dpsf->sf_next = pmc->tomb;
2087 pmc->tomb = dpsf;
2088 }
2089 dpsf->sf_crcount = qrv;
2090 rv++;
2091 }
2092 }
2093 return rv;
2094}
2095#endif
2096
2097/*
2098 * Add multicast source filter list to the interface list
2099 */
2100static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2101 int sfcount, __be32 *psfsrc, int delta)
2102{
2103 struct ip_mc_list *pmc;
2104 int isexclude;
2105 int i, err;
2106
2107 if (!in_dev)
2108 return -ENODEV;
2109 rcu_read_lock();
2110 for_each_pmc_rcu(in_dev, pmc) {
2111 if (*pmca == pmc->multiaddr)
2112 break;
2113 }
2114 if (!pmc) {
2115 /* MCA not found?? bug */
2116 rcu_read_unlock();
2117 return -ESRCH;
2118 }
2119 spin_lock_bh(&pmc->lock);
2120 rcu_read_unlock();
2121
2122#ifdef CONFIG_IP_MULTICAST
2123 sf_markstate(pmc);
2124#endif
2125 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2126 if (!delta)
2127 pmc->sfcount[sfmode]++;
2128 err = 0;
2129 for (i = 0; i < sfcount; i++) {
2130 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2131 if (err)
2132 break;
2133 }
2134 if (err) {
2135 int j;
2136
2137 if (!delta)
2138 pmc->sfcount[sfmode]--;
2139 for (j = 0; j < i; j++)
2140 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2141 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2142#ifdef CONFIG_IP_MULTICAST
2143 struct ip_sf_list *psf;
2144 struct net *net = dev_net(pmc->interface->dev);
2145 in_dev = pmc->interface;
2146#endif
2147
2148 /* filter mode change */
2149 if (pmc->sfcount[MCAST_EXCLUDE])
2150 pmc->sfmode = MCAST_EXCLUDE;
2151 else if (pmc->sfcount[MCAST_INCLUDE])
2152 pmc->sfmode = MCAST_INCLUDE;
2153#ifdef CONFIG_IP_MULTICAST
2154 /* else no filters; keep old mode for reports */
2155
2156 pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
2157 WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
2158 for (psf = pmc->sources; psf; psf = psf->sf_next)
2159 psf->sf_crcount = 0;
2160 igmp_ifc_event(in_dev);
2161 } else if (sf_setstate(pmc)) {
2162 igmp_ifc_event(in_dev);
2163#endif
2164 }
2165 spin_unlock_bh(&pmc->lock);
2166 return err;
2167}
2168
2169static void ip_mc_clear_src(struct ip_mc_list *pmc)
2170{
2171 struct ip_sf_list *tomb, *sources;
2172
2173 spin_lock_bh(&pmc->lock);
2174 tomb = pmc->tomb;
2175 pmc->tomb = NULL;
2176 sources = pmc->sources;
2177 pmc->sources = NULL;
2178 pmc->sfmode = MCAST_EXCLUDE;
2179 pmc->sfcount[MCAST_INCLUDE] = 0;
2180 pmc->sfcount[MCAST_EXCLUDE] = 1;
2181 spin_unlock_bh(&pmc->lock);
2182
2183 ip_sf_list_clear_all(tomb);
2184 ip_sf_list_clear_all(sources);
2185}
2186
2187/* Join a multicast group
2188 */
2189static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
2190 unsigned int mode)
2191{
2192 __be32 addr = imr->imr_multiaddr.s_addr;
2193 struct ip_mc_socklist *iml, *i;
2194 struct in_device *in_dev;
2195 struct inet_sock *inet = inet_sk(sk);
2196 struct net *net = sock_net(sk);
2197 int ifindex;
2198 int count = 0;
2199 int err;
2200
2201 ASSERT_RTNL();
2202
2203 if (!ipv4_is_multicast(addr))
2204 return -EINVAL;
2205
2206 in_dev = ip_mc_find_dev(net, imr);
2207
2208 if (!in_dev) {
2209 err = -ENODEV;
2210 goto done;
2211 }
2212
2213 err = -EADDRINUSE;
2214 ifindex = imr->imr_ifindex;
2215 for_each_pmc_rtnl(inet, i) {
2216 if (i->multi.imr_multiaddr.s_addr == addr &&
2217 i->multi.imr_ifindex == ifindex)
2218 goto done;
2219 count++;
2220 }
2221 err = -ENOBUFS;
2222 if (count >= READ_ONCE(net->ipv4.sysctl_igmp_max_memberships))
2223 goto done;
2224 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2225 if (!iml)
2226 goto done;
2227
2228 memcpy(&iml->multi, imr, sizeof(*imr));
2229 iml->next_rcu = inet->mc_list;
2230 iml->sflist = NULL;
2231 iml->sfmode = mode;
2232 rcu_assign_pointer(inet->mc_list, iml);
2233 ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL);
2234 err = 0;
2235done:
2236 return err;
2237}
2238
2239/* Join ASM (Any-Source Multicast) group
2240 */
2241int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2242{
2243 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
2244}
2245EXPORT_SYMBOL(ip_mc_join_group);
2246
2247/* Join SSM (Source-Specific Multicast) group
2248 */
2249int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
2250 unsigned int mode)
2251{
2252 return __ip_mc_join_group(sk, imr, mode);
2253}
2254
2255static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2256 struct in_device *in_dev)
2257{
2258 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2259 int err;
2260
2261 if (!psf) {
2262 /* any-source empty exclude case */
2263 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2264 iml->sfmode, 0, NULL, 0);
2265 }
2266 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2267 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2268 RCU_INIT_POINTER(iml->sflist, NULL);
2269 /* decrease mem now to avoid the memleak warning */
2270 atomic_sub(struct_size(psf, sl_addr, psf->sl_max), &sk->sk_omem_alloc);
2271 kfree_rcu(psf, rcu);
2272 return err;
2273}
2274
2275int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2276{
2277 struct inet_sock *inet = inet_sk(sk);
2278 struct ip_mc_socklist *iml;
2279 struct ip_mc_socklist __rcu **imlp;
2280 struct in_device *in_dev;
2281 struct net *net = sock_net(sk);
2282 __be32 group = imr->imr_multiaddr.s_addr;
2283 u32 ifindex;
2284 int ret = -EADDRNOTAVAIL;
2285
2286 ASSERT_RTNL();
2287
2288 in_dev = ip_mc_find_dev(net, imr);
2289 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2290 ret = -ENODEV;
2291 goto out;
2292 }
2293 ifindex = imr->imr_ifindex;
2294 for (imlp = &inet->mc_list;
2295 (iml = rtnl_dereference(*imlp)) != NULL;
2296 imlp = &iml->next_rcu) {
2297 if (iml->multi.imr_multiaddr.s_addr != group)
2298 continue;
2299 if (ifindex) {
2300 if (iml->multi.imr_ifindex != ifindex)
2301 continue;
2302 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2303 iml->multi.imr_address.s_addr)
2304 continue;
2305
2306 (void) ip_mc_leave_src(sk, iml, in_dev);
2307
2308 *imlp = iml->next_rcu;
2309
2310 if (in_dev)
2311 ip_mc_dec_group(in_dev, group);
2312
2313 /* decrease mem now to avoid the memleak warning */
2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315 kfree_rcu(iml, rcu);
2316 return 0;
2317 }
2318out:
2319 return ret;
2320}
2321EXPORT_SYMBOL(ip_mc_leave_group);
2322
2323int ip_mc_source(int add, int omode, struct sock *sk, struct
2324 ip_mreq_source *mreqs, int ifindex)
2325{
2326 int err;
2327 struct ip_mreqn imr;
2328 __be32 addr = mreqs->imr_multiaddr;
2329 struct ip_mc_socklist *pmc;
2330 struct in_device *in_dev = NULL;
2331 struct inet_sock *inet = inet_sk(sk);
2332 struct ip_sf_socklist *psl;
2333 struct net *net = sock_net(sk);
2334 int leavegroup = 0;
2335 int i, j, rv;
2336
2337 if (!ipv4_is_multicast(addr))
2338 return -EINVAL;
2339
2340 ASSERT_RTNL();
2341
2342 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2343 imr.imr_address.s_addr = mreqs->imr_interface;
2344 imr.imr_ifindex = ifindex;
2345 in_dev = ip_mc_find_dev(net, &imr);
2346
2347 if (!in_dev) {
2348 err = -ENODEV;
2349 goto done;
2350 }
2351 err = -EADDRNOTAVAIL;
2352
2353 for_each_pmc_rtnl(inet, pmc) {
2354 if ((pmc->multi.imr_multiaddr.s_addr ==
2355 imr.imr_multiaddr.s_addr) &&
2356 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2357 break;
2358 }
2359 if (!pmc) { /* must have a prior join */
2360 err = -EINVAL;
2361 goto done;
2362 }
2363 /* if a source filter was set, must be the same mode as before */
2364 if (pmc->sflist) {
2365 if (pmc->sfmode != omode) {
2366 err = -EINVAL;
2367 goto done;
2368 }
2369 } else if (pmc->sfmode != omode) {
2370 /* allow mode switches for empty-set filters */
2371 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2372 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2373 NULL, 0);
2374 pmc->sfmode = omode;
2375 }
2376
2377 psl = rtnl_dereference(pmc->sflist);
2378 if (!add) {
2379 if (!psl)
2380 goto done; /* err = -EADDRNOTAVAIL */
2381 rv = !0;
2382 for (i = 0; i < psl->sl_count; i++) {
2383 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2384 sizeof(__be32));
2385 if (rv == 0)
2386 break;
2387 }
2388 if (rv) /* source not found */
2389 goto done; /* err = -EADDRNOTAVAIL */
2390
2391 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2392 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2393 leavegroup = 1;
2394 goto done;
2395 }
2396
2397 /* update the interface filter */
2398 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2399 &mreqs->imr_sourceaddr, 1);
2400
2401 for (j = i+1; j < psl->sl_count; j++)
2402 psl->sl_addr[j-1] = psl->sl_addr[j];
2403 psl->sl_count--;
2404 err = 0;
2405 goto done;
2406 }
2407 /* else, add a new source to the filter */
2408
2409 if (psl && psl->sl_count >= READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) {
2410 err = -ENOBUFS;
2411 goto done;
2412 }
2413 if (!psl || psl->sl_count == psl->sl_max) {
2414 struct ip_sf_socklist *newpsl;
2415 int count = IP_SFBLOCK;
2416
2417 if (psl)
2418 count += psl->sl_max;
2419 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
2420 GFP_KERNEL);
2421 if (!newpsl) {
2422 err = -ENOBUFS;
2423 goto done;
2424 }
2425 newpsl->sl_max = count;
2426 newpsl->sl_count = count - IP_SFBLOCK;
2427 if (psl) {
2428 for (i = 0; i < psl->sl_count; i++)
2429 newpsl->sl_addr[i] = psl->sl_addr[i];
2430 /* decrease mem now to avoid the memleak warning */
2431 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2432 &sk->sk_omem_alloc);
2433 }
2434 rcu_assign_pointer(pmc->sflist, newpsl);
2435 if (psl)
2436 kfree_rcu(psl, rcu);
2437 psl = newpsl;
2438 }
2439 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2440 for (i = 0; i < psl->sl_count; i++) {
2441 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2442 sizeof(__be32));
2443 if (rv == 0)
2444 break;
2445 }
2446 if (rv == 0) /* address already there is an error */
2447 goto done;
2448 for (j = psl->sl_count-1; j >= i; j--)
2449 psl->sl_addr[j+1] = psl->sl_addr[j];
2450 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2451 psl->sl_count++;
2452 err = 0;
2453 /* update the interface list */
2454 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2455 &mreqs->imr_sourceaddr, 1);
2456done:
2457 if (leavegroup)
2458 err = ip_mc_leave_group(sk, &imr);
2459 return err;
2460}
2461
2462int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2463{
2464 int err = 0;
2465 struct ip_mreqn imr;
2466 __be32 addr = msf->imsf_multiaddr;
2467 struct ip_mc_socklist *pmc;
2468 struct in_device *in_dev;
2469 struct inet_sock *inet = inet_sk(sk);
2470 struct ip_sf_socklist *newpsl, *psl;
2471 struct net *net = sock_net(sk);
2472 int leavegroup = 0;
2473
2474 if (!ipv4_is_multicast(addr))
2475 return -EINVAL;
2476 if (msf->imsf_fmode != MCAST_INCLUDE &&
2477 msf->imsf_fmode != MCAST_EXCLUDE)
2478 return -EINVAL;
2479
2480 ASSERT_RTNL();
2481
2482 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2483 imr.imr_address.s_addr = msf->imsf_interface;
2484 imr.imr_ifindex = ifindex;
2485 in_dev = ip_mc_find_dev(net, &imr);
2486
2487 if (!in_dev) {
2488 err = -ENODEV;
2489 goto done;
2490 }
2491
2492 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2493 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2494 leavegroup = 1;
2495 goto done;
2496 }
2497
2498 for_each_pmc_rtnl(inet, pmc) {
2499 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2500 pmc->multi.imr_ifindex == imr.imr_ifindex)
2501 break;
2502 }
2503 if (!pmc) { /* must have a prior join */
2504 err = -EINVAL;
2505 goto done;
2506 }
2507 if (msf->imsf_numsrc) {
2508 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
2509 msf->imsf_numsrc),
2510 GFP_KERNEL);
2511 if (!newpsl) {
2512 err = -ENOBUFS;
2513 goto done;
2514 }
2515 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2516 memcpy(newpsl->sl_addr, msf->imsf_slist_flex,
2517 flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc));
2518 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2519 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2520 if (err) {
2521 sock_kfree_s(sk, newpsl,
2522 struct_size(newpsl, sl_addr,
2523 newpsl->sl_max));
2524 goto done;
2525 }
2526 } else {
2527 newpsl = NULL;
2528 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2529 msf->imsf_fmode, 0, NULL, 0);
2530 }
2531 psl = rtnl_dereference(pmc->sflist);
2532 if (psl) {
2533 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2534 psl->sl_count, psl->sl_addr, 0);
2535 /* decrease mem now to avoid the memleak warning */
2536 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2537 &sk->sk_omem_alloc);
2538 } else {
2539 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2540 0, NULL, 0);
2541 }
2542 rcu_assign_pointer(pmc->sflist, newpsl);
2543 if (psl)
2544 kfree_rcu(psl, rcu);
2545 pmc->sfmode = msf->imsf_fmode;
2546 err = 0;
2547done:
2548 if (leavegroup)
2549 err = ip_mc_leave_group(sk, &imr);
2550 return err;
2551}
2552int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2553 sockptr_t optval, sockptr_t optlen)
2554{
2555 int err, len, count, copycount, msf_size;
2556 struct ip_mreqn imr;
2557 __be32 addr = msf->imsf_multiaddr;
2558 struct ip_mc_socklist *pmc;
2559 struct in_device *in_dev;
2560 struct inet_sock *inet = inet_sk(sk);
2561 struct ip_sf_socklist *psl;
2562 struct net *net = sock_net(sk);
2563
2564 ASSERT_RTNL();
2565
2566 if (!ipv4_is_multicast(addr))
2567 return -EINVAL;
2568
2569 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2570 imr.imr_address.s_addr = msf->imsf_interface;
2571 imr.imr_ifindex = 0;
2572 in_dev = ip_mc_find_dev(net, &imr);
2573
2574 if (!in_dev) {
2575 err = -ENODEV;
2576 goto done;
2577 }
2578 err = -EADDRNOTAVAIL;
2579
2580 for_each_pmc_rtnl(inet, pmc) {
2581 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2582 pmc->multi.imr_ifindex == imr.imr_ifindex)
2583 break;
2584 }
2585 if (!pmc) /* must have a prior join */
2586 goto done;
2587 msf->imsf_fmode = pmc->sfmode;
2588 psl = rtnl_dereference(pmc->sflist);
2589 if (!psl) {
2590 count = 0;
2591 } else {
2592 count = psl->sl_count;
2593 }
2594 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2595 len = flex_array_size(psl, sl_addr, copycount);
2596 msf->imsf_numsrc = count;
2597 msf_size = IP_MSFILTER_SIZE(copycount);
2598 if (copy_to_sockptr(optlen, &msf_size, sizeof(int)) ||
2599 copy_to_sockptr(optval, msf, IP_MSFILTER_SIZE(0))) {
2600 return -EFAULT;
2601 }
2602 if (len &&
2603 copy_to_sockptr_offset(optval,
2604 offsetof(struct ip_msfilter, imsf_slist_flex),
2605 psl->sl_addr, len))
2606 return -EFAULT;
2607 return 0;
2608done:
2609 return err;
2610}
2611
2612int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2613 sockptr_t optval, size_t ss_offset)
2614{
2615 int i, count, copycount;
2616 struct sockaddr_in *psin;
2617 __be32 addr;
2618 struct ip_mc_socklist *pmc;
2619 struct inet_sock *inet = inet_sk(sk);
2620 struct ip_sf_socklist *psl;
2621
2622 ASSERT_RTNL();
2623
2624 psin = (struct sockaddr_in *)&gsf->gf_group;
2625 if (psin->sin_family != AF_INET)
2626 return -EINVAL;
2627 addr = psin->sin_addr.s_addr;
2628 if (!ipv4_is_multicast(addr))
2629 return -EINVAL;
2630
2631 for_each_pmc_rtnl(inet, pmc) {
2632 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2633 pmc->multi.imr_ifindex == gsf->gf_interface)
2634 break;
2635 }
2636 if (!pmc) /* must have a prior join */
2637 return -EADDRNOTAVAIL;
2638 gsf->gf_fmode = pmc->sfmode;
2639 psl = rtnl_dereference(pmc->sflist);
2640 count = psl ? psl->sl_count : 0;
2641 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2642 gsf->gf_numsrc = count;
2643 for (i = 0; i < copycount; i++) {
2644 struct sockaddr_storage ss;
2645
2646 psin = (struct sockaddr_in *)&ss;
2647 memset(&ss, 0, sizeof(ss));
2648 psin->sin_family = AF_INET;
2649 psin->sin_addr.s_addr = psl->sl_addr[i];
2650 if (copy_to_sockptr_offset(optval, ss_offset,
2651 &ss, sizeof(ss)))
2652 return -EFAULT;
2653 ss_offset += sizeof(ss);
2654 }
2655 return 0;
2656}
2657
2658/*
2659 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2660 */
2661int ip_mc_sf_allow(const struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2662 int dif, int sdif)
2663{
2664 const struct inet_sock *inet = inet_sk(sk);
2665 struct ip_mc_socklist *pmc;
2666 struct ip_sf_socklist *psl;
2667 int i;
2668 int ret;
2669
2670 ret = 1;
2671 if (!ipv4_is_multicast(loc_addr))
2672 goto out;
2673
2674 rcu_read_lock();
2675 for_each_pmc_rcu(inet, pmc) {
2676 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2677 (pmc->multi.imr_ifindex == dif ||
2678 (sdif && pmc->multi.imr_ifindex == sdif)))
2679 break;
2680 }
2681 ret = inet_test_bit(MC_ALL, sk);
2682 if (!pmc)
2683 goto unlock;
2684 psl = rcu_dereference(pmc->sflist);
2685 ret = (pmc->sfmode == MCAST_EXCLUDE);
2686 if (!psl)
2687 goto unlock;
2688
2689 for (i = 0; i < psl->sl_count; i++) {
2690 if (psl->sl_addr[i] == rmt_addr)
2691 break;
2692 }
2693 ret = 0;
2694 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2695 goto unlock;
2696 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2697 goto unlock;
2698 ret = 1;
2699unlock:
2700 rcu_read_unlock();
2701out:
2702 return ret;
2703}
2704
2705/*
2706 * A socket is closing.
2707 */
2708
2709void ip_mc_drop_socket(struct sock *sk)
2710{
2711 struct inet_sock *inet = inet_sk(sk);
2712 struct ip_mc_socklist *iml;
2713 struct net *net = sock_net(sk);
2714
2715 if (!inet->mc_list)
2716 return;
2717
2718 rtnl_lock();
2719 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2720 struct in_device *in_dev;
2721
2722 inet->mc_list = iml->next_rcu;
2723 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2724 (void) ip_mc_leave_src(sk, iml, in_dev);
2725 if (in_dev)
2726 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2727 /* decrease mem now to avoid the memleak warning */
2728 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2729 kfree_rcu(iml, rcu);
2730 }
2731 rtnl_unlock();
2732}
2733
2734/* called with rcu_read_lock() */
2735int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2736{
2737 struct ip_mc_list *im;
2738 struct ip_mc_list __rcu **mc_hash;
2739 struct ip_sf_list *psf;
2740 int rv = 0;
2741
2742 mc_hash = rcu_dereference(in_dev->mc_hash);
2743 if (mc_hash) {
2744 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2745
2746 for (im = rcu_dereference(mc_hash[hash]);
2747 im != NULL;
2748 im = rcu_dereference(im->next_hash)) {
2749 if (im->multiaddr == mc_addr)
2750 break;
2751 }
2752 } else {
2753 for_each_pmc_rcu(in_dev, im) {
2754 if (im->multiaddr == mc_addr)
2755 break;
2756 }
2757 }
2758 if (im && proto == IPPROTO_IGMP) {
2759 rv = 1;
2760 } else if (im) {
2761 if (src_addr) {
2762 spin_lock_bh(&im->lock);
2763 for (psf = im->sources; psf; psf = psf->sf_next) {
2764 if (psf->sf_inaddr == src_addr)
2765 break;
2766 }
2767 if (psf)
2768 rv = psf->sf_count[MCAST_INCLUDE] ||
2769 psf->sf_count[MCAST_EXCLUDE] !=
2770 im->sfcount[MCAST_EXCLUDE];
2771 else
2772 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2773 spin_unlock_bh(&im->lock);
2774 } else
2775 rv = 1; /* unspecified source; tentatively allow */
2776 }
2777 return rv;
2778}
2779
2780#if defined(CONFIG_PROC_FS)
2781struct igmp_mc_iter_state {
2782 struct seq_net_private p;
2783 struct net_device *dev;
2784 struct in_device *in_dev;
2785};
2786
2787#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2788
2789static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2790{
2791 struct net *net = seq_file_net(seq);
2792 struct ip_mc_list *im = NULL;
2793 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2794
2795 state->in_dev = NULL;
2796 for_each_netdev_rcu(net, state->dev) {
2797 struct in_device *in_dev;
2798
2799 in_dev = __in_dev_get_rcu(state->dev);
2800 if (!in_dev)
2801 continue;
2802 im = rcu_dereference(in_dev->mc_list);
2803 if (im) {
2804 state->in_dev = in_dev;
2805 break;
2806 }
2807 }
2808 return im;
2809}
2810
2811static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2812{
2813 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2814
2815 im = rcu_dereference(im->next_rcu);
2816 while (!im) {
2817 state->dev = next_net_device_rcu(state->dev);
2818 if (!state->dev) {
2819 state->in_dev = NULL;
2820 break;
2821 }
2822 state->in_dev = __in_dev_get_rcu(state->dev);
2823 if (!state->in_dev)
2824 continue;
2825 im = rcu_dereference(state->in_dev->mc_list);
2826 }
2827 return im;
2828}
2829
2830static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2831{
2832 struct ip_mc_list *im = igmp_mc_get_first(seq);
2833 if (im)
2834 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2835 --pos;
2836 return pos ? NULL : im;
2837}
2838
2839static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2840 __acquires(rcu)
2841{
2842 rcu_read_lock();
2843 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2844}
2845
2846static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2847{
2848 struct ip_mc_list *im;
2849 if (v == SEQ_START_TOKEN)
2850 im = igmp_mc_get_first(seq);
2851 else
2852 im = igmp_mc_get_next(seq, v);
2853 ++*pos;
2854 return im;
2855}
2856
2857static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2858 __releases(rcu)
2859{
2860 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2861
2862 state->in_dev = NULL;
2863 state->dev = NULL;
2864 rcu_read_unlock();
2865}
2866
2867static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2868{
2869 if (v == SEQ_START_TOKEN)
2870 seq_puts(seq,
2871 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2872 else {
2873 struct ip_mc_list *im = v;
2874 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2875 char *querier;
2876 long delta;
2877
2878#ifdef CONFIG_IP_MULTICAST
2879 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2880 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2881 "V3";
2882#else
2883 querier = "NONE";
2884#endif
2885
2886 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2887 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2888 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2889 }
2890
2891 delta = im->timer.expires - jiffies;
2892 seq_printf(seq,
2893 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2894 im->multiaddr, im->users,
2895 im->tm_running,
2896 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2897 im->reporter);
2898 }
2899 return 0;
2900}
2901
2902static const struct seq_operations igmp_mc_seq_ops = {
2903 .start = igmp_mc_seq_start,
2904 .next = igmp_mc_seq_next,
2905 .stop = igmp_mc_seq_stop,
2906 .show = igmp_mc_seq_show,
2907};
2908
2909struct igmp_mcf_iter_state {
2910 struct seq_net_private p;
2911 struct net_device *dev;
2912 struct in_device *idev;
2913 struct ip_mc_list *im;
2914};
2915
2916#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2917
2918static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2919{
2920 struct net *net = seq_file_net(seq);
2921 struct ip_sf_list *psf = NULL;
2922 struct ip_mc_list *im = NULL;
2923 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2924
2925 state->idev = NULL;
2926 state->im = NULL;
2927 for_each_netdev_rcu(net, state->dev) {
2928 struct in_device *idev;
2929 idev = __in_dev_get_rcu(state->dev);
2930 if (unlikely(!idev))
2931 continue;
2932 im = rcu_dereference(idev->mc_list);
2933 if (likely(im)) {
2934 spin_lock_bh(&im->lock);
2935 psf = im->sources;
2936 if (likely(psf)) {
2937 state->im = im;
2938 state->idev = idev;
2939 break;
2940 }
2941 spin_unlock_bh(&im->lock);
2942 }
2943 }
2944 return psf;
2945}
2946
2947static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2948{
2949 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2950
2951 psf = psf->sf_next;
2952 while (!psf) {
2953 spin_unlock_bh(&state->im->lock);
2954 state->im = state->im->next;
2955 while (!state->im) {
2956 state->dev = next_net_device_rcu(state->dev);
2957 if (!state->dev) {
2958 state->idev = NULL;
2959 goto out;
2960 }
2961 state->idev = __in_dev_get_rcu(state->dev);
2962 if (!state->idev)
2963 continue;
2964 state->im = rcu_dereference(state->idev->mc_list);
2965 }
2966 spin_lock_bh(&state->im->lock);
2967 psf = state->im->sources;
2968 }
2969out:
2970 return psf;
2971}
2972
2973static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2974{
2975 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2976 if (psf)
2977 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2978 --pos;
2979 return pos ? NULL : psf;
2980}
2981
2982static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2983 __acquires(rcu)
2984{
2985 rcu_read_lock();
2986 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2987}
2988
2989static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2990{
2991 struct ip_sf_list *psf;
2992 if (v == SEQ_START_TOKEN)
2993 psf = igmp_mcf_get_first(seq);
2994 else
2995 psf = igmp_mcf_get_next(seq, v);
2996 ++*pos;
2997 return psf;
2998}
2999
3000static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
3001 __releases(rcu)
3002{
3003 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3004 if (likely(state->im)) {
3005 spin_unlock_bh(&state->im->lock);
3006 state->im = NULL;
3007 }
3008 state->idev = NULL;
3009 state->dev = NULL;
3010 rcu_read_unlock();
3011}
3012
3013static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
3014{
3015 struct ip_sf_list *psf = v;
3016 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3017
3018 if (v == SEQ_START_TOKEN) {
3019 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
3020 } else {
3021 seq_printf(seq,
3022 "%3d %6.6s 0x%08x "
3023 "0x%08x %6lu %6lu\n",
3024 state->dev->ifindex, state->dev->name,
3025 ntohl(state->im->multiaddr),
3026 ntohl(psf->sf_inaddr),
3027 psf->sf_count[MCAST_INCLUDE],
3028 psf->sf_count[MCAST_EXCLUDE]);
3029 }
3030 return 0;
3031}
3032
3033static const struct seq_operations igmp_mcf_seq_ops = {
3034 .start = igmp_mcf_seq_start,
3035 .next = igmp_mcf_seq_next,
3036 .stop = igmp_mcf_seq_stop,
3037 .show = igmp_mcf_seq_show,
3038};
3039
3040static int __net_init igmp_net_init(struct net *net)
3041{
3042 struct proc_dir_entry *pde;
3043 int err;
3044
3045 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
3046 sizeof(struct igmp_mc_iter_state));
3047 if (!pde)
3048 goto out_igmp;
3049 pde = proc_create_net("mcfilter", 0444, net->proc_net,
3050 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
3051 if (!pde)
3052 goto out_mcfilter;
3053 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3054 SOCK_DGRAM, 0, net);
3055 if (err < 0) {
3056 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3057 err);
3058 goto out_sock;
3059 }
3060
3061 return 0;
3062
3063out_sock:
3064 remove_proc_entry("mcfilter", net->proc_net);
3065out_mcfilter:
3066 remove_proc_entry("igmp", net->proc_net);
3067out_igmp:
3068 return -ENOMEM;
3069}
3070
3071static void __net_exit igmp_net_exit(struct net *net)
3072{
3073 remove_proc_entry("mcfilter", net->proc_net);
3074 remove_proc_entry("igmp", net->proc_net);
3075 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3076}
3077
3078static struct pernet_operations igmp_net_ops = {
3079 .init = igmp_net_init,
3080 .exit = igmp_net_exit,
3081};
3082#endif
3083
3084static int igmp_netdev_event(struct notifier_block *this,
3085 unsigned long event, void *ptr)
3086{
3087 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3088 struct in_device *in_dev;
3089
3090 switch (event) {
3091 case NETDEV_RESEND_IGMP:
3092 in_dev = __in_dev_get_rtnl(dev);
3093 if (in_dev)
3094 ip_mc_rejoin_groups(in_dev);
3095 break;
3096 default:
3097 break;
3098 }
3099 return NOTIFY_DONE;
3100}
3101
3102static struct notifier_block igmp_notifier = {
3103 .notifier_call = igmp_netdev_event,
3104};
3105
3106int __init igmp_mc_init(void)
3107{
3108#if defined(CONFIG_PROC_FS)
3109 int err;
3110
3111 err = register_pernet_subsys(&igmp_net_ops);
3112 if (err)
3113 return err;
3114 err = register_netdevice_notifier(&igmp_notifier);
3115 if (err)
3116 goto reg_notif_fail;
3117 return 0;
3118
3119reg_notif_fail:
3120 unregister_pernet_subsys(&igmp_net_ops);
3121 return err;
3122#else
3123 return register_netdevice_notifier(&igmp_notifier);
3124#endif
3125}
1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73#include <linux/module.h>
74#include <linux/slab.h>
75#include <asm/uaccess.h>
76#include <linux/types.h>
77#include <linux/kernel.h>
78#include <linux/jiffies.h>
79#include <linux/string.h>
80#include <linux/socket.h>
81#include <linux/sockios.h>
82#include <linux/in.h>
83#include <linux/inet.h>
84#include <linux/netdevice.h>
85#include <linux/skbuff.h>
86#include <linux/inetdevice.h>
87#include <linux/igmp.h>
88#include <linux/if_arp.h>
89#include <linux/rtnetlink.h>
90#include <linux/times.h>
91#include <linux/pkt_sched.h>
92
93#include <net/net_namespace.h>
94#include <net/arp.h>
95#include <net/ip.h>
96#include <net/protocol.h>
97#include <net/route.h>
98#include <net/sock.h>
99#include <net/checksum.h>
100#include <linux/netfilter_ipv4.h>
101#ifdef CONFIG_IP_MROUTE
102#include <linux/mroute.h>
103#endif
104#ifdef CONFIG_PROC_FS
105#include <linux/proc_fs.h>
106#include <linux/seq_file.h>
107#endif
108
109#define IP_MAX_MEMBERSHIPS 20
110#define IP_MAX_MSF 10
111
112#ifdef CONFIG_IP_MULTICAST
113/* Parameter names and values are taken from igmp-v2-06 draft */
114
115#define IGMP_V1_Router_Present_Timeout (400*HZ)
116#define IGMP_V2_Router_Present_Timeout (400*HZ)
117#define IGMP_V2_Unsolicited_Report_Interval (10*HZ)
118#define IGMP_V3_Unsolicited_Report_Interval (1*HZ)
119#define IGMP_Query_Response_Interval (10*HZ)
120#define IGMP_Unsolicited_Report_Count 2
121
122
123#define IGMP_Initial_Report_Delay (1)
124
125/* IGMP_Initial_Report_Delay is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
130 */
131
132#define IGMP_V1_SEEN(in_dev) \
133 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137#define IGMP_V2_SEEN(in_dev) \
138 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
142
143static int unsolicited_report_interval(struct in_device *in_dev)
144{
145 int interval_ms, interval_jiffies;
146
147 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
148 interval_ms = IN_DEV_CONF_GET(
149 in_dev,
150 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
151 else /* v3 */
152 interval_ms = IN_DEV_CONF_GET(
153 in_dev,
154 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
155
156 interval_jiffies = msecs_to_jiffies(interval_ms);
157
158 /* _timer functions can't handle a delay of 0 jiffies so ensure
159 * we always return a positive value.
160 */
161 if (interval_jiffies <= 0)
162 interval_jiffies = 1;
163 return interval_jiffies;
164}
165
166static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
167static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
168static void igmpv3_clear_delrec(struct in_device *in_dev);
169static int sf_setstate(struct ip_mc_list *pmc);
170static void sf_markstate(struct ip_mc_list *pmc);
171#endif
172static void ip_mc_clear_src(struct ip_mc_list *pmc);
173static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
174 int sfcount, __be32 *psfsrc, int delta);
175
176static void ip_ma_put(struct ip_mc_list *im)
177{
178 if (atomic_dec_and_test(&im->refcnt)) {
179 in_dev_put(im->interface);
180 kfree_rcu(im, rcu);
181 }
182}
183
184#define for_each_pmc_rcu(in_dev, pmc) \
185 for (pmc = rcu_dereference(in_dev->mc_list); \
186 pmc != NULL; \
187 pmc = rcu_dereference(pmc->next_rcu))
188
189#define for_each_pmc_rtnl(in_dev, pmc) \
190 for (pmc = rtnl_dereference(in_dev->mc_list); \
191 pmc != NULL; \
192 pmc = rtnl_dereference(pmc->next_rcu))
193
194#ifdef CONFIG_IP_MULTICAST
195
196/*
197 * Timer management
198 */
199
200static void igmp_stop_timer(struct ip_mc_list *im)
201{
202 spin_lock_bh(&im->lock);
203 if (del_timer(&im->timer))
204 atomic_dec(&im->refcnt);
205 im->tm_running = 0;
206 im->reporter = 0;
207 im->unsolicit_count = 0;
208 spin_unlock_bh(&im->lock);
209}
210
211/* It must be called with locked im->lock */
212static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
213{
214 int tv = prandom_u32() % max_delay;
215
216 im->tm_running = 1;
217 if (!mod_timer(&im->timer, jiffies+tv+2))
218 atomic_inc(&im->refcnt);
219}
220
221static void igmp_gq_start_timer(struct in_device *in_dev)
222{
223 int tv = prandom_u32() % in_dev->mr_maxdelay;
224
225 in_dev->mr_gq_running = 1;
226 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
227 in_dev_hold(in_dev);
228}
229
230static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
231{
232 int tv = prandom_u32() % delay;
233
234 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
235 in_dev_hold(in_dev);
236}
237
238static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
239{
240 spin_lock_bh(&im->lock);
241 im->unsolicit_count = 0;
242 if (del_timer(&im->timer)) {
243 if ((long)(im->timer.expires-jiffies) < max_delay) {
244 add_timer(&im->timer);
245 im->tm_running = 1;
246 spin_unlock_bh(&im->lock);
247 return;
248 }
249 atomic_dec(&im->refcnt);
250 }
251 igmp_start_timer(im, max_delay);
252 spin_unlock_bh(&im->lock);
253}
254
255
256/*
257 * Send an IGMP report.
258 */
259
260#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
261
262
263static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
264 int gdeleted, int sdeleted)
265{
266 switch (type) {
267 case IGMPV3_MODE_IS_INCLUDE:
268 case IGMPV3_MODE_IS_EXCLUDE:
269 if (gdeleted || sdeleted)
270 return 0;
271 if (!(pmc->gsquery && !psf->sf_gsresp)) {
272 if (pmc->sfmode == MCAST_INCLUDE)
273 return 1;
274 /* don't include if this source is excluded
275 * in all filters
276 */
277 if (psf->sf_count[MCAST_INCLUDE])
278 return type == IGMPV3_MODE_IS_INCLUDE;
279 return pmc->sfcount[MCAST_EXCLUDE] ==
280 psf->sf_count[MCAST_EXCLUDE];
281 }
282 return 0;
283 case IGMPV3_CHANGE_TO_INCLUDE:
284 if (gdeleted || sdeleted)
285 return 0;
286 return psf->sf_count[MCAST_INCLUDE] != 0;
287 case IGMPV3_CHANGE_TO_EXCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
291 psf->sf_count[MCAST_INCLUDE])
292 return 0;
293 return pmc->sfcount[MCAST_EXCLUDE] ==
294 psf->sf_count[MCAST_EXCLUDE];
295 case IGMPV3_ALLOW_NEW_SOURCES:
296 if (gdeleted || !psf->sf_crcount)
297 return 0;
298 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
299 case IGMPV3_BLOCK_OLD_SOURCES:
300 if (pmc->sfmode == MCAST_INCLUDE)
301 return gdeleted || (psf->sf_crcount && sdeleted);
302 return psf->sf_crcount && !gdeleted && !sdeleted;
303 }
304 return 0;
305}
306
307static int
308igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
309{
310 struct ip_sf_list *psf;
311 int scount = 0;
312
313 for (psf = pmc->sources; psf; psf = psf->sf_next) {
314 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
315 continue;
316 scount++;
317 }
318 return scount;
319}
320
321#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
322
323static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
324{
325 struct sk_buff *skb;
326 struct rtable *rt;
327 struct iphdr *pip;
328 struct igmpv3_report *pig;
329 struct net *net = dev_net(dev);
330 struct flowi4 fl4;
331 int hlen = LL_RESERVED_SPACE(dev);
332 int tlen = dev->needed_tailroom;
333
334 while (1) {
335 skb = alloc_skb(size + hlen + tlen,
336 GFP_ATOMIC | __GFP_NOWARN);
337 if (skb)
338 break;
339 size >>= 1;
340 if (size < 256)
341 return NULL;
342 }
343 skb->priority = TC_PRIO_CONTROL;
344 igmp_skb_size(skb) = size;
345
346 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
347 0, 0,
348 IPPROTO_IGMP, 0, dev->ifindex);
349 if (IS_ERR(rt)) {
350 kfree_skb(skb);
351 return NULL;
352 }
353
354 skb_dst_set(skb, &rt->dst);
355 skb->dev = dev;
356
357 skb_reserve(skb, hlen);
358
359 skb_reset_network_header(skb);
360 pip = ip_hdr(skb);
361 skb_put(skb, sizeof(struct iphdr) + 4);
362
363 pip->version = 4;
364 pip->ihl = (sizeof(struct iphdr)+4)>>2;
365 pip->tos = 0xc0;
366 pip->frag_off = htons(IP_DF);
367 pip->ttl = 1;
368 pip->daddr = fl4.daddr;
369 pip->saddr = fl4.saddr;
370 pip->protocol = IPPROTO_IGMP;
371 pip->tot_len = 0; /* filled in later */
372 ip_select_ident(skb, &rt->dst, NULL);
373 ((u8 *)&pip[1])[0] = IPOPT_RA;
374 ((u8 *)&pip[1])[1] = 4;
375 ((u8 *)&pip[1])[2] = 0;
376 ((u8 *)&pip[1])[3] = 0;
377
378 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
379 skb_put(skb, sizeof(*pig));
380 pig = igmpv3_report_hdr(skb);
381 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
382 pig->resv1 = 0;
383 pig->csum = 0;
384 pig->resv2 = 0;
385 pig->ngrec = 0;
386 return skb;
387}
388
389static int igmpv3_sendpack(struct sk_buff *skb)
390{
391 struct igmphdr *pig = igmp_hdr(skb);
392 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
393
394 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
395
396 return ip_local_out(skb);
397}
398
399static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
400{
401 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
402}
403
404static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
405 int type, struct igmpv3_grec **ppgr)
406{
407 struct net_device *dev = pmc->interface->dev;
408 struct igmpv3_report *pih;
409 struct igmpv3_grec *pgr;
410
411 if (!skb)
412 skb = igmpv3_newpack(dev, dev->mtu);
413 if (!skb)
414 return NULL;
415 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
416 pgr->grec_type = type;
417 pgr->grec_auxwords = 0;
418 pgr->grec_nsrcs = 0;
419 pgr->grec_mca = pmc->multiaddr;
420 pih = igmpv3_report_hdr(skb);
421 pih->ngrec = htons(ntohs(pih->ngrec)+1);
422 *ppgr = pgr;
423 return skb;
424}
425
426#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
427 skb_tailroom(skb)) : 0)
428
429static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
430 int type, int gdeleted, int sdeleted)
431{
432 struct net_device *dev = pmc->interface->dev;
433 struct igmpv3_report *pih;
434 struct igmpv3_grec *pgr = NULL;
435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
436 int scount, stotal, first, isquery, truncate;
437
438 if (pmc->multiaddr == IGMP_ALL_HOSTS)
439 return skb;
440
441 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
442 type == IGMPV3_MODE_IS_EXCLUDE;
443 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
444 type == IGMPV3_CHANGE_TO_EXCLUDE;
445
446 stotal = scount = 0;
447
448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
449
450 if (!*psf_list)
451 goto empty_source;
452
453 pih = skb ? igmpv3_report_hdr(skb) : NULL;
454
455 /* EX and TO_EX get a fresh packet, if needed */
456 if (truncate) {
457 if (pih && pih->ngrec &&
458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
459 if (skb)
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
462 }
463 }
464 first = 1;
465 psf_prev = NULL;
466 for (psf = *psf_list; psf; psf = psf_next) {
467 __be32 *psrc;
468
469 psf_next = psf->sf_next;
470
471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
472 psf_prev = psf;
473 continue;
474 }
475
476 /* clear marks on query responses */
477 if (isquery)
478 psf->sf_gsresp = 0;
479
480 if (AVAILABLE(skb) < sizeof(__be32) +
481 first*sizeof(struct igmpv3_grec)) {
482 if (truncate && !first)
483 break; /* truncate these */
484 if (pgr)
485 pgr->grec_nsrcs = htons(scount);
486 if (skb)
487 igmpv3_sendpack(skb);
488 skb = igmpv3_newpack(dev, dev->mtu);
489 first = 1;
490 scount = 0;
491 }
492 if (first) {
493 skb = add_grhead(skb, pmc, type, &pgr);
494 first = 0;
495 }
496 if (!skb)
497 return NULL;
498 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
499 *psrc = psf->sf_inaddr;
500 scount++; stotal++;
501 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
503 psf->sf_crcount--;
504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
505 if (psf_prev)
506 psf_prev->sf_next = psf->sf_next;
507 else
508 *psf_list = psf->sf_next;
509 kfree(psf);
510 continue;
511 }
512 }
513 psf_prev = psf;
514 }
515
516empty_source:
517 if (!stotal) {
518 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
519 type == IGMPV3_BLOCK_OLD_SOURCES)
520 return skb;
521 if (pmc->crcount || isquery) {
522 /* make sure we have room for group header */
523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
524 igmpv3_sendpack(skb);
525 skb = NULL; /* add_grhead will get a new one */
526 }
527 skb = add_grhead(skb, pmc, type, &pgr);
528 }
529 }
530 if (pgr)
531 pgr->grec_nsrcs = htons(scount);
532
533 if (isquery)
534 pmc->gsquery = 0; /* clear query state on report */
535 return skb;
536}
537
538static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
539{
540 struct sk_buff *skb = NULL;
541 int type;
542
543 if (!pmc) {
544 rcu_read_lock();
545 for_each_pmc_rcu(in_dev, pmc) {
546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
547 continue;
548 spin_lock_bh(&pmc->lock);
549 if (pmc->sfcount[MCAST_EXCLUDE])
550 type = IGMPV3_MODE_IS_EXCLUDE;
551 else
552 type = IGMPV3_MODE_IS_INCLUDE;
553 skb = add_grec(skb, pmc, type, 0, 0);
554 spin_unlock_bh(&pmc->lock);
555 }
556 rcu_read_unlock();
557 } else {
558 spin_lock_bh(&pmc->lock);
559 if (pmc->sfcount[MCAST_EXCLUDE])
560 type = IGMPV3_MODE_IS_EXCLUDE;
561 else
562 type = IGMPV3_MODE_IS_INCLUDE;
563 skb = add_grec(skb, pmc, type, 0, 0);
564 spin_unlock_bh(&pmc->lock);
565 }
566 if (!skb)
567 return 0;
568 return igmpv3_sendpack(skb);
569}
570
571/*
572 * remove zero-count source records from a source filter list
573 */
574static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
575{
576 struct ip_sf_list *psf_prev, *psf_next, *psf;
577
578 psf_prev = NULL;
579 for (psf = *ppsf; psf; psf = psf_next) {
580 psf_next = psf->sf_next;
581 if (psf->sf_crcount == 0) {
582 if (psf_prev)
583 psf_prev->sf_next = psf->sf_next;
584 else
585 *ppsf = psf->sf_next;
586 kfree(psf);
587 } else
588 psf_prev = psf;
589 }
590}
591
592static void igmpv3_send_cr(struct in_device *in_dev)
593{
594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
595 struct sk_buff *skb = NULL;
596 int type, dtype;
597
598 rcu_read_lock();
599 spin_lock_bh(&in_dev->mc_tomb_lock);
600
601 /* deleted MCA's */
602 pmc_prev = NULL;
603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
604 pmc_next = pmc->next;
605 if (pmc->sfmode == MCAST_INCLUDE) {
606 type = IGMPV3_BLOCK_OLD_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 skb = add_grec(skb, pmc, type, 1, 0);
609 skb = add_grec(skb, pmc, dtype, 1, 1);
610 }
611 if (pmc->crcount) {
612 if (pmc->sfmode == MCAST_EXCLUDE) {
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 1, 0);
615 }
616 pmc->crcount--;
617 if (pmc->crcount == 0) {
618 igmpv3_clear_zeros(&pmc->tomb);
619 igmpv3_clear_zeros(&pmc->sources);
620 }
621 }
622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
623 if (pmc_prev)
624 pmc_prev->next = pmc_next;
625 else
626 in_dev->mc_tomb = pmc_next;
627 in_dev_put(pmc->interface);
628 kfree(pmc);
629 } else
630 pmc_prev = pmc;
631 }
632 spin_unlock_bh(&in_dev->mc_tomb_lock);
633
634 /* change recs */
635 for_each_pmc_rcu(in_dev, pmc) {
636 spin_lock_bh(&pmc->lock);
637 if (pmc->sfcount[MCAST_EXCLUDE]) {
638 type = IGMPV3_BLOCK_OLD_SOURCES;
639 dtype = IGMPV3_ALLOW_NEW_SOURCES;
640 } else {
641 type = IGMPV3_ALLOW_NEW_SOURCES;
642 dtype = IGMPV3_BLOCK_OLD_SOURCES;
643 }
644 skb = add_grec(skb, pmc, type, 0, 0);
645 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
646
647 /* filter mode changes */
648 if (pmc->crcount) {
649 if (pmc->sfmode == MCAST_EXCLUDE)
650 type = IGMPV3_CHANGE_TO_EXCLUDE;
651 else
652 type = IGMPV3_CHANGE_TO_INCLUDE;
653 skb = add_grec(skb, pmc, type, 0, 0);
654 pmc->crcount--;
655 }
656 spin_unlock_bh(&pmc->lock);
657 }
658 rcu_read_unlock();
659
660 if (!skb)
661 return;
662 (void) igmpv3_sendpack(skb);
663}
664
665static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
666 int type)
667{
668 struct sk_buff *skb;
669 struct iphdr *iph;
670 struct igmphdr *ih;
671 struct rtable *rt;
672 struct net_device *dev = in_dev->dev;
673 struct net *net = dev_net(dev);
674 __be32 group = pmc ? pmc->multiaddr : 0;
675 struct flowi4 fl4;
676 __be32 dst;
677 int hlen, tlen;
678
679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
680 return igmpv3_send_report(in_dev, pmc);
681 else if (type == IGMP_HOST_LEAVE_MESSAGE)
682 dst = IGMP_ALL_ROUTER;
683 else
684 dst = group;
685
686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
687 0, 0,
688 IPPROTO_IGMP, 0, dev->ifindex);
689 if (IS_ERR(rt))
690 return -1;
691
692 hlen = LL_RESERVED_SPACE(dev);
693 tlen = dev->needed_tailroom;
694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
695 if (skb == NULL) {
696 ip_rt_put(rt);
697 return -1;
698 }
699 skb->priority = TC_PRIO_CONTROL;
700
701 skb_dst_set(skb, &rt->dst);
702
703 skb_reserve(skb, hlen);
704
705 skb_reset_network_header(skb);
706 iph = ip_hdr(skb);
707 skb_put(skb, sizeof(struct iphdr) + 4);
708
709 iph->version = 4;
710 iph->ihl = (sizeof(struct iphdr)+4)>>2;
711 iph->tos = 0xc0;
712 iph->frag_off = htons(IP_DF);
713 iph->ttl = 1;
714 iph->daddr = dst;
715 iph->saddr = fl4.saddr;
716 iph->protocol = IPPROTO_IGMP;
717 ip_select_ident(skb, &rt->dst, NULL);
718 ((u8 *)&iph[1])[0] = IPOPT_RA;
719 ((u8 *)&iph[1])[1] = 4;
720 ((u8 *)&iph[1])[2] = 0;
721 ((u8 *)&iph[1])[3] = 0;
722
723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
724 ih->type = type;
725 ih->code = 0;
726 ih->csum = 0;
727 ih->group = group;
728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
729
730 return ip_local_out(skb);
731}
732
733static void igmp_gq_timer_expire(unsigned long data)
734{
735 struct in_device *in_dev = (struct in_device *)data;
736
737 in_dev->mr_gq_running = 0;
738 igmpv3_send_report(in_dev, NULL);
739 in_dev_put(in_dev);
740}
741
742static void igmp_ifc_timer_expire(unsigned long data)
743{
744 struct in_device *in_dev = (struct in_device *)data;
745
746 igmpv3_send_cr(in_dev);
747 if (in_dev->mr_ifc_count) {
748 in_dev->mr_ifc_count--;
749 igmp_ifc_start_timer(in_dev,
750 unsolicited_report_interval(in_dev));
751 }
752 in_dev_put(in_dev);
753}
754
755static void igmp_ifc_event(struct in_device *in_dev)
756{
757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
758 return;
759 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
760 IGMP_Unsolicited_Report_Count;
761 igmp_ifc_start_timer(in_dev, 1);
762}
763
764
765static void igmp_timer_expire(unsigned long data)
766{
767 struct ip_mc_list *im = (struct ip_mc_list *)data;
768 struct in_device *in_dev = im->interface;
769
770 spin_lock(&im->lock);
771 im->tm_running = 0;
772
773 if (im->unsolicit_count) {
774 im->unsolicit_count--;
775 igmp_start_timer(im, unsolicited_report_interval(in_dev));
776 }
777 im->reporter = 1;
778 spin_unlock(&im->lock);
779
780 if (IGMP_V1_SEEN(in_dev))
781 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
782 else if (IGMP_V2_SEEN(in_dev))
783 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
784 else
785 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
786
787 ip_ma_put(im);
788}
789
790/* mark EXCLUDE-mode sources */
791static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
792{
793 struct ip_sf_list *psf;
794 int i, scount;
795
796 scount = 0;
797 for (psf = pmc->sources; psf; psf = psf->sf_next) {
798 if (scount == nsrcs)
799 break;
800 for (i = 0; i < nsrcs; i++) {
801 /* skip inactive filters */
802 if (psf->sf_count[MCAST_INCLUDE] ||
803 pmc->sfcount[MCAST_EXCLUDE] !=
804 psf->sf_count[MCAST_EXCLUDE])
805 break;
806 if (srcs[i] == psf->sf_inaddr) {
807 scount++;
808 break;
809 }
810 }
811 }
812 pmc->gsquery = 0;
813 if (scount == nsrcs) /* all sources excluded */
814 return 0;
815 return 1;
816}
817
818static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
819{
820 struct ip_sf_list *psf;
821 int i, scount;
822
823 if (pmc->sfmode == MCAST_EXCLUDE)
824 return igmp_xmarksources(pmc, nsrcs, srcs);
825
826 /* mark INCLUDE-mode sources */
827 scount = 0;
828 for (psf = pmc->sources; psf; psf = psf->sf_next) {
829 if (scount == nsrcs)
830 break;
831 for (i = 0; i < nsrcs; i++)
832 if (srcs[i] == psf->sf_inaddr) {
833 psf->sf_gsresp = 1;
834 scount++;
835 break;
836 }
837 }
838 if (!scount) {
839 pmc->gsquery = 0;
840 return 0;
841 }
842 pmc->gsquery = 1;
843 return 1;
844}
845
846/* return true if packet was dropped */
847static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
848{
849 struct ip_mc_list *im;
850
851 /* Timers are only set for non-local groups */
852
853 if (group == IGMP_ALL_HOSTS)
854 return false;
855
856 rcu_read_lock();
857 for_each_pmc_rcu(in_dev, im) {
858 if (im->multiaddr == group) {
859 igmp_stop_timer(im);
860 break;
861 }
862 }
863 rcu_read_unlock();
864 return false;
865}
866
867/* return true if packet was dropped */
868static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
869 int len)
870{
871 struct igmphdr *ih = igmp_hdr(skb);
872 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
873 struct ip_mc_list *im;
874 __be32 group = ih->group;
875 int max_delay;
876 int mark = 0;
877
878
879 if (len == 8) {
880 if (ih->code == 0) {
881 /* Alas, old v1 router presents here. */
882
883 max_delay = IGMP_Query_Response_Interval;
884 in_dev->mr_v1_seen = jiffies +
885 IGMP_V1_Router_Present_Timeout;
886 group = 0;
887 } else {
888 /* v2 router present */
889 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
890 in_dev->mr_v2_seen = jiffies +
891 IGMP_V2_Router_Present_Timeout;
892 }
893 /* cancel the interface change timer */
894 in_dev->mr_ifc_count = 0;
895 if (del_timer(&in_dev->mr_ifc_timer))
896 __in_dev_put(in_dev);
897 /* clear deleted report items */
898 igmpv3_clear_delrec(in_dev);
899 } else if (len < 12) {
900 return true; /* ignore bogus packet; freed by caller */
901 } else if (IGMP_V1_SEEN(in_dev)) {
902 /* This is a v3 query with v1 queriers present */
903 max_delay = IGMP_Query_Response_Interval;
904 group = 0;
905 } else if (IGMP_V2_SEEN(in_dev)) {
906 /* this is a v3 query with v2 queriers present;
907 * Interpretation of the max_delay code is problematic here.
908 * A real v2 host would use ih_code directly, while v3 has a
909 * different encoding. We use the v3 encoding as more likely
910 * to be intended in a v3 query.
911 */
912 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
913 if (!max_delay)
914 max_delay = 1; /* can't mod w/ 0 */
915 } else { /* v3 */
916 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
917 return true;
918
919 ih3 = igmpv3_query_hdr(skb);
920 if (ih3->nsrcs) {
921 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
922 + ntohs(ih3->nsrcs)*sizeof(__be32)))
923 return true;
924 ih3 = igmpv3_query_hdr(skb);
925 }
926
927 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
928 if (!max_delay)
929 max_delay = 1; /* can't mod w/ 0 */
930 in_dev->mr_maxdelay = max_delay;
931 if (ih3->qrv)
932 in_dev->mr_qrv = ih3->qrv;
933 if (!group) { /* general query */
934 if (ih3->nsrcs)
935 return false; /* no sources allowed */
936 igmp_gq_start_timer(in_dev);
937 return false;
938 }
939 /* mark sources to include, if group & source-specific */
940 mark = ih3->nsrcs != 0;
941 }
942
943 /*
944 * - Start the timers in all of our membership records
945 * that the query applies to for the interface on
946 * which the query arrived excl. those that belong
947 * to a "local" group (224.0.0.X)
948 * - For timers already running check if they need to
949 * be reset.
950 * - Use the igmp->igmp_code field as the maximum
951 * delay possible
952 */
953 rcu_read_lock();
954 for_each_pmc_rcu(in_dev, im) {
955 int changed;
956
957 if (group && group != im->multiaddr)
958 continue;
959 if (im->multiaddr == IGMP_ALL_HOSTS)
960 continue;
961 spin_lock_bh(&im->lock);
962 if (im->tm_running)
963 im->gsquery = im->gsquery && mark;
964 else
965 im->gsquery = mark;
966 changed = !im->gsquery ||
967 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
968 spin_unlock_bh(&im->lock);
969 if (changed)
970 igmp_mod_timer(im, max_delay);
971 }
972 rcu_read_unlock();
973 return false;
974}
975
976/* called in rcu_read_lock() section */
977int igmp_rcv(struct sk_buff *skb)
978{
979 /* This basically follows the spec line by line -- see RFC1112 */
980 struct igmphdr *ih;
981 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
982 int len = skb->len;
983 bool dropped = true;
984
985 if (in_dev == NULL)
986 goto drop;
987
988 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
989 goto drop;
990
991 switch (skb->ip_summed) {
992 case CHECKSUM_COMPLETE:
993 if (!csum_fold(skb->csum))
994 break;
995 /* fall through */
996 case CHECKSUM_NONE:
997 skb->csum = 0;
998 if (__skb_checksum_complete(skb))
999 goto drop;
1000 }
1001
1002 ih = igmp_hdr(skb);
1003 switch (ih->type) {
1004 case IGMP_HOST_MEMBERSHIP_QUERY:
1005 dropped = igmp_heard_query(in_dev, skb, len);
1006 break;
1007 case IGMP_HOST_MEMBERSHIP_REPORT:
1008 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1009 /* Is it our report looped back? */
1010 if (rt_is_output_route(skb_rtable(skb)))
1011 break;
1012 /* don't rely on MC router hearing unicast reports */
1013 if (skb->pkt_type == PACKET_MULTICAST ||
1014 skb->pkt_type == PACKET_BROADCAST)
1015 dropped = igmp_heard_report(in_dev, ih->group);
1016 break;
1017 case IGMP_PIM:
1018#ifdef CONFIG_IP_PIMSM_V1
1019 return pim_rcv_v1(skb);
1020#endif
1021 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1022 case IGMP_DVMRP:
1023 case IGMP_TRACE:
1024 case IGMP_HOST_LEAVE_MESSAGE:
1025 case IGMP_MTRACE:
1026 case IGMP_MTRACE_RESP:
1027 break;
1028 default:
1029 break;
1030 }
1031
1032drop:
1033 if (dropped)
1034 kfree_skb(skb);
1035 else
1036 consume_skb(skb);
1037 return 0;
1038}
1039
1040#endif
1041
1042
1043/*
1044 * Add a filter to a device
1045 */
1046
1047static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1048{
1049 char buf[MAX_ADDR_LEN];
1050 struct net_device *dev = in_dev->dev;
1051
1052 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1053 We will get multicast token leakage, when IFF_MULTICAST
1054 is changed. This check should be done in ndo_set_rx_mode
1055 routine. Something sort of:
1056 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1057 --ANK
1058 */
1059 if (arp_mc_map(addr, buf, dev, 0) == 0)
1060 dev_mc_add(dev, buf);
1061}
1062
1063/*
1064 * Remove a filter from a device
1065 */
1066
1067static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1068{
1069 char buf[MAX_ADDR_LEN];
1070 struct net_device *dev = in_dev->dev;
1071
1072 if (arp_mc_map(addr, buf, dev, 0) == 0)
1073 dev_mc_del(dev, buf);
1074}
1075
1076#ifdef CONFIG_IP_MULTICAST
1077/*
1078 * deleted ip_mc_list manipulation
1079 */
1080static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1081{
1082 struct ip_mc_list *pmc;
1083
1084 /* this is an "ip_mc_list" for convenience; only the fields below
1085 * are actually used. In particular, the refcnt and users are not
1086 * used for management of the delete list. Using the same structure
1087 * for deleted items allows change reports to use common code with
1088 * non-deleted or query-response MCA's.
1089 */
1090 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1091 if (!pmc)
1092 return;
1093 spin_lock_bh(&im->lock);
1094 pmc->interface = im->interface;
1095 in_dev_hold(in_dev);
1096 pmc->multiaddr = im->multiaddr;
1097 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1098 IGMP_Unsolicited_Report_Count;
1099 pmc->sfmode = im->sfmode;
1100 if (pmc->sfmode == MCAST_INCLUDE) {
1101 struct ip_sf_list *psf;
1102
1103 pmc->tomb = im->tomb;
1104 pmc->sources = im->sources;
1105 im->tomb = im->sources = NULL;
1106 for (psf = pmc->sources; psf; psf = psf->sf_next)
1107 psf->sf_crcount = pmc->crcount;
1108 }
1109 spin_unlock_bh(&im->lock);
1110
1111 spin_lock_bh(&in_dev->mc_tomb_lock);
1112 pmc->next = in_dev->mc_tomb;
1113 in_dev->mc_tomb = pmc;
1114 spin_unlock_bh(&in_dev->mc_tomb_lock);
1115}
1116
1117static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1118{
1119 struct ip_mc_list *pmc, *pmc_prev;
1120 struct ip_sf_list *psf, *psf_next;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc_prev = NULL;
1124 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1125 if (pmc->multiaddr == multiaddr)
1126 break;
1127 pmc_prev = pmc;
1128 }
1129 if (pmc) {
1130 if (pmc_prev)
1131 pmc_prev->next = pmc->next;
1132 else
1133 in_dev->mc_tomb = pmc->next;
1134 }
1135 spin_unlock_bh(&in_dev->mc_tomb_lock);
1136 if (pmc) {
1137 for (psf = pmc->tomb; psf; psf = psf_next) {
1138 psf_next = psf->sf_next;
1139 kfree(psf);
1140 }
1141 in_dev_put(pmc->interface);
1142 kfree(pmc);
1143 }
1144}
1145
1146static void igmpv3_clear_delrec(struct in_device *in_dev)
1147{
1148 struct ip_mc_list *pmc, *nextpmc;
1149
1150 spin_lock_bh(&in_dev->mc_tomb_lock);
1151 pmc = in_dev->mc_tomb;
1152 in_dev->mc_tomb = NULL;
1153 spin_unlock_bh(&in_dev->mc_tomb_lock);
1154
1155 for (; pmc; pmc = nextpmc) {
1156 nextpmc = pmc->next;
1157 ip_mc_clear_src(pmc);
1158 in_dev_put(pmc->interface);
1159 kfree(pmc);
1160 }
1161 /* clear dead sources, too */
1162 rcu_read_lock();
1163 for_each_pmc_rcu(in_dev, pmc) {
1164 struct ip_sf_list *psf, *psf_next;
1165
1166 spin_lock_bh(&pmc->lock);
1167 psf = pmc->tomb;
1168 pmc->tomb = NULL;
1169 spin_unlock_bh(&pmc->lock);
1170 for (; psf; psf = psf_next) {
1171 psf_next = psf->sf_next;
1172 kfree(psf);
1173 }
1174 }
1175 rcu_read_unlock();
1176}
1177#endif
1178
1179static void igmp_group_dropped(struct ip_mc_list *im)
1180{
1181 struct in_device *in_dev = im->interface;
1182#ifdef CONFIG_IP_MULTICAST
1183 int reporter;
1184#endif
1185
1186 if (im->loaded) {
1187 im->loaded = 0;
1188 ip_mc_filter_del(in_dev, im->multiaddr);
1189 }
1190
1191#ifdef CONFIG_IP_MULTICAST
1192 if (im->multiaddr == IGMP_ALL_HOSTS)
1193 return;
1194
1195 reporter = im->reporter;
1196 igmp_stop_timer(im);
1197
1198 if (!in_dev->dead) {
1199 if (IGMP_V1_SEEN(in_dev))
1200 return;
1201 if (IGMP_V2_SEEN(in_dev)) {
1202 if (reporter)
1203 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1204 return;
1205 }
1206 /* IGMPv3 */
1207 igmpv3_add_delrec(in_dev, im);
1208
1209 igmp_ifc_event(in_dev);
1210 }
1211#endif
1212}
1213
1214static void igmp_group_added(struct ip_mc_list *im)
1215{
1216 struct in_device *in_dev = im->interface;
1217
1218 if (im->loaded == 0) {
1219 im->loaded = 1;
1220 ip_mc_filter_add(in_dev, im->multiaddr);
1221 }
1222
1223#ifdef CONFIG_IP_MULTICAST
1224 if (im->multiaddr == IGMP_ALL_HOSTS)
1225 return;
1226
1227 if (in_dev->dead)
1228 return;
1229 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1230 spin_lock_bh(&im->lock);
1231 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1232 spin_unlock_bh(&im->lock);
1233 return;
1234 }
1235 /* else, v3 */
1236
1237 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1238 IGMP_Unsolicited_Report_Count;
1239 igmp_ifc_event(in_dev);
1240#endif
1241}
1242
1243
1244/*
1245 * Multicast list managers
1246 */
1247
1248static u32 ip_mc_hash(const struct ip_mc_list *im)
1249{
1250 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1251}
1252
1253static void ip_mc_hash_add(struct in_device *in_dev,
1254 struct ip_mc_list *im)
1255{
1256 struct ip_mc_list __rcu **mc_hash;
1257 u32 hash;
1258
1259 mc_hash = rtnl_dereference(in_dev->mc_hash);
1260 if (mc_hash) {
1261 hash = ip_mc_hash(im);
1262 im->next_hash = mc_hash[hash];
1263 rcu_assign_pointer(mc_hash[hash], im);
1264 return;
1265 }
1266
1267 /* do not use a hash table for small number of items */
1268 if (in_dev->mc_count < 4)
1269 return;
1270
1271 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1272 GFP_KERNEL);
1273 if (!mc_hash)
1274 return;
1275
1276 for_each_pmc_rtnl(in_dev, im) {
1277 hash = ip_mc_hash(im);
1278 im->next_hash = mc_hash[hash];
1279 RCU_INIT_POINTER(mc_hash[hash], im);
1280 }
1281
1282 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1283}
1284
1285static void ip_mc_hash_remove(struct in_device *in_dev,
1286 struct ip_mc_list *im)
1287{
1288 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1289 struct ip_mc_list *aux;
1290
1291 if (!mc_hash)
1292 return;
1293 mc_hash += ip_mc_hash(im);
1294 while ((aux = rtnl_dereference(*mc_hash)) != im)
1295 mc_hash = &aux->next_hash;
1296 *mc_hash = im->next_hash;
1297}
1298
1299
1300/*
1301 * A socket has joined a multicast group on device dev.
1302 */
1303
1304void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1305{
1306 struct ip_mc_list *im;
1307
1308 ASSERT_RTNL();
1309
1310 for_each_pmc_rtnl(in_dev, im) {
1311 if (im->multiaddr == addr) {
1312 im->users++;
1313 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1314 goto out;
1315 }
1316 }
1317
1318 im = kzalloc(sizeof(*im), GFP_KERNEL);
1319 if (!im)
1320 goto out;
1321
1322 im->users = 1;
1323 im->interface = in_dev;
1324 in_dev_hold(in_dev);
1325 im->multiaddr = addr;
1326 /* initial mode is (EX, empty) */
1327 im->sfmode = MCAST_EXCLUDE;
1328 im->sfcount[MCAST_EXCLUDE] = 1;
1329 atomic_set(&im->refcnt, 1);
1330 spin_lock_init(&im->lock);
1331#ifdef CONFIG_IP_MULTICAST
1332 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1333 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1334#endif
1335
1336 im->next_rcu = in_dev->mc_list;
1337 in_dev->mc_count++;
1338 rcu_assign_pointer(in_dev->mc_list, im);
1339
1340 ip_mc_hash_add(in_dev, im);
1341
1342#ifdef CONFIG_IP_MULTICAST
1343 igmpv3_del_delrec(in_dev, im->multiaddr);
1344#endif
1345 igmp_group_added(im);
1346 if (!in_dev->dead)
1347 ip_rt_multicast_event(in_dev);
1348out:
1349 return;
1350}
1351EXPORT_SYMBOL(ip_mc_inc_group);
1352
1353/*
1354 * Resend IGMP JOIN report; used by netdev notifier.
1355 */
1356static void ip_mc_rejoin_groups(struct in_device *in_dev)
1357{
1358#ifdef CONFIG_IP_MULTICAST
1359 struct ip_mc_list *im;
1360 int type;
1361
1362 ASSERT_RTNL();
1363
1364 for_each_pmc_rtnl(in_dev, im) {
1365 if (im->multiaddr == IGMP_ALL_HOSTS)
1366 continue;
1367
1368 /* a failover is happening and switches
1369 * must be notified immediately
1370 */
1371 if (IGMP_V1_SEEN(in_dev))
1372 type = IGMP_HOST_MEMBERSHIP_REPORT;
1373 else if (IGMP_V2_SEEN(in_dev))
1374 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1375 else
1376 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1377 igmp_send_report(in_dev, im, type);
1378 }
1379#endif
1380}
1381
1382/*
1383 * A socket has left a multicast group on device dev
1384 */
1385
1386void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1387{
1388 struct ip_mc_list *i;
1389 struct ip_mc_list __rcu **ip;
1390
1391 ASSERT_RTNL();
1392
1393 for (ip = &in_dev->mc_list;
1394 (i = rtnl_dereference(*ip)) != NULL;
1395 ip = &i->next_rcu) {
1396 if (i->multiaddr == addr) {
1397 if (--i->users == 0) {
1398 ip_mc_hash_remove(in_dev, i);
1399 *ip = i->next_rcu;
1400 in_dev->mc_count--;
1401 igmp_group_dropped(i);
1402 ip_mc_clear_src(i);
1403
1404 if (!in_dev->dead)
1405 ip_rt_multicast_event(in_dev);
1406
1407 ip_ma_put(i);
1408 return;
1409 }
1410 break;
1411 }
1412 }
1413}
1414EXPORT_SYMBOL(ip_mc_dec_group);
1415
1416/* Device changing type */
1417
1418void ip_mc_unmap(struct in_device *in_dev)
1419{
1420 struct ip_mc_list *pmc;
1421
1422 ASSERT_RTNL();
1423
1424 for_each_pmc_rtnl(in_dev, pmc)
1425 igmp_group_dropped(pmc);
1426}
1427
1428void ip_mc_remap(struct in_device *in_dev)
1429{
1430 struct ip_mc_list *pmc;
1431
1432 ASSERT_RTNL();
1433
1434 for_each_pmc_rtnl(in_dev, pmc)
1435 igmp_group_added(pmc);
1436}
1437
1438/* Device going down */
1439
1440void ip_mc_down(struct in_device *in_dev)
1441{
1442 struct ip_mc_list *pmc;
1443
1444 ASSERT_RTNL();
1445
1446 for_each_pmc_rtnl(in_dev, pmc)
1447 igmp_group_dropped(pmc);
1448
1449#ifdef CONFIG_IP_MULTICAST
1450 in_dev->mr_ifc_count = 0;
1451 if (del_timer(&in_dev->mr_ifc_timer))
1452 __in_dev_put(in_dev);
1453 in_dev->mr_gq_running = 0;
1454 if (del_timer(&in_dev->mr_gq_timer))
1455 __in_dev_put(in_dev);
1456 igmpv3_clear_delrec(in_dev);
1457#endif
1458
1459 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1460}
1461
1462void ip_mc_init_dev(struct in_device *in_dev)
1463{
1464 ASSERT_RTNL();
1465
1466#ifdef CONFIG_IP_MULTICAST
1467 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1468 (unsigned long)in_dev);
1469 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1470 (unsigned long)in_dev);
1471 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1472#endif
1473
1474 spin_lock_init(&in_dev->mc_tomb_lock);
1475}
1476
1477/* Device going up */
1478
1479void ip_mc_up(struct in_device *in_dev)
1480{
1481 struct ip_mc_list *pmc;
1482
1483 ASSERT_RTNL();
1484
1485 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1486
1487 for_each_pmc_rtnl(in_dev, pmc)
1488 igmp_group_added(pmc);
1489}
1490
1491/*
1492 * Device is about to be destroyed: clean up.
1493 */
1494
1495void ip_mc_destroy_dev(struct in_device *in_dev)
1496{
1497 struct ip_mc_list *i;
1498
1499 ASSERT_RTNL();
1500
1501 /* Deactivate timers */
1502 ip_mc_down(in_dev);
1503
1504 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1505 in_dev->mc_list = i->next_rcu;
1506 in_dev->mc_count--;
1507
1508 /* We've dropped the groups in ip_mc_down already */
1509 ip_mc_clear_src(i);
1510 ip_ma_put(i);
1511 }
1512}
1513
1514/* RTNL is locked */
1515static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1516{
1517 struct net_device *dev = NULL;
1518 struct in_device *idev = NULL;
1519
1520 if (imr->imr_ifindex) {
1521 idev = inetdev_by_index(net, imr->imr_ifindex);
1522 return idev;
1523 }
1524 if (imr->imr_address.s_addr) {
1525 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1526 if (!dev)
1527 return NULL;
1528 }
1529
1530 if (!dev) {
1531 struct rtable *rt = ip_route_output(net,
1532 imr->imr_multiaddr.s_addr,
1533 0, 0, 0);
1534 if (!IS_ERR(rt)) {
1535 dev = rt->dst.dev;
1536 ip_rt_put(rt);
1537 }
1538 }
1539 if (dev) {
1540 imr->imr_ifindex = dev->ifindex;
1541 idev = __in_dev_get_rtnl(dev);
1542 }
1543 return idev;
1544}
1545
1546/*
1547 * Join a socket to a group
1548 */
1549int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1550int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1551
1552
1553static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1554 __be32 *psfsrc)
1555{
1556 struct ip_sf_list *psf, *psf_prev;
1557 int rv = 0;
1558
1559 psf_prev = NULL;
1560 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1561 if (psf->sf_inaddr == *psfsrc)
1562 break;
1563 psf_prev = psf;
1564 }
1565 if (!psf || psf->sf_count[sfmode] == 0) {
1566 /* source filter not found, or count wrong => bug */
1567 return -ESRCH;
1568 }
1569 psf->sf_count[sfmode]--;
1570 if (psf->sf_count[sfmode] == 0) {
1571 ip_rt_multicast_event(pmc->interface);
1572 }
1573 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1574#ifdef CONFIG_IP_MULTICAST
1575 struct in_device *in_dev = pmc->interface;
1576#endif
1577
1578 /* no more filters for this source */
1579 if (psf_prev)
1580 psf_prev->sf_next = psf->sf_next;
1581 else
1582 pmc->sources = psf->sf_next;
1583#ifdef CONFIG_IP_MULTICAST
1584 if (psf->sf_oldin &&
1585 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1586 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1587 IGMP_Unsolicited_Report_Count;
1588 psf->sf_next = pmc->tomb;
1589 pmc->tomb = psf;
1590 rv = 1;
1591 } else
1592#endif
1593 kfree(psf);
1594 }
1595 return rv;
1596}
1597
1598#ifndef CONFIG_IP_MULTICAST
1599#define igmp_ifc_event(x) do { } while (0)
1600#endif
1601
1602static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1603 int sfcount, __be32 *psfsrc, int delta)
1604{
1605 struct ip_mc_list *pmc;
1606 int changerec = 0;
1607 int i, err;
1608
1609 if (!in_dev)
1610 return -ENODEV;
1611 rcu_read_lock();
1612 for_each_pmc_rcu(in_dev, pmc) {
1613 if (*pmca == pmc->multiaddr)
1614 break;
1615 }
1616 if (!pmc) {
1617 /* MCA not found?? bug */
1618 rcu_read_unlock();
1619 return -ESRCH;
1620 }
1621 spin_lock_bh(&pmc->lock);
1622 rcu_read_unlock();
1623#ifdef CONFIG_IP_MULTICAST
1624 sf_markstate(pmc);
1625#endif
1626 if (!delta) {
1627 err = -EINVAL;
1628 if (!pmc->sfcount[sfmode])
1629 goto out_unlock;
1630 pmc->sfcount[sfmode]--;
1631 }
1632 err = 0;
1633 for (i = 0; i < sfcount; i++) {
1634 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1635
1636 changerec |= rv > 0;
1637 if (!err && rv < 0)
1638 err = rv;
1639 }
1640 if (pmc->sfmode == MCAST_EXCLUDE &&
1641 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1642 pmc->sfcount[MCAST_INCLUDE]) {
1643#ifdef CONFIG_IP_MULTICAST
1644 struct ip_sf_list *psf;
1645#endif
1646
1647 /* filter mode change */
1648 pmc->sfmode = MCAST_INCLUDE;
1649#ifdef CONFIG_IP_MULTICAST
1650 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1651 IGMP_Unsolicited_Report_Count;
1652 in_dev->mr_ifc_count = pmc->crcount;
1653 for (psf = pmc->sources; psf; psf = psf->sf_next)
1654 psf->sf_crcount = 0;
1655 igmp_ifc_event(pmc->interface);
1656 } else if (sf_setstate(pmc) || changerec) {
1657 igmp_ifc_event(pmc->interface);
1658#endif
1659 }
1660out_unlock:
1661 spin_unlock_bh(&pmc->lock);
1662 return err;
1663}
1664
1665/*
1666 * Add multicast single-source filter to the interface list
1667 */
1668static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1669 __be32 *psfsrc)
1670{
1671 struct ip_sf_list *psf, *psf_prev;
1672
1673 psf_prev = NULL;
1674 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1675 if (psf->sf_inaddr == *psfsrc)
1676 break;
1677 psf_prev = psf;
1678 }
1679 if (!psf) {
1680 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1681 if (!psf)
1682 return -ENOBUFS;
1683 psf->sf_inaddr = *psfsrc;
1684 if (psf_prev) {
1685 psf_prev->sf_next = psf;
1686 } else
1687 pmc->sources = psf;
1688 }
1689 psf->sf_count[sfmode]++;
1690 if (psf->sf_count[sfmode] == 1) {
1691 ip_rt_multicast_event(pmc->interface);
1692 }
1693 return 0;
1694}
1695
1696#ifdef CONFIG_IP_MULTICAST
1697static void sf_markstate(struct ip_mc_list *pmc)
1698{
1699 struct ip_sf_list *psf;
1700 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1701
1702 for (psf = pmc->sources; psf; psf = psf->sf_next)
1703 if (pmc->sfcount[MCAST_EXCLUDE]) {
1704 psf->sf_oldin = mca_xcount ==
1705 psf->sf_count[MCAST_EXCLUDE] &&
1706 !psf->sf_count[MCAST_INCLUDE];
1707 } else
1708 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1709}
1710
1711static int sf_setstate(struct ip_mc_list *pmc)
1712{
1713 struct ip_sf_list *psf, *dpsf;
1714 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1715 int qrv = pmc->interface->mr_qrv;
1716 int new_in, rv;
1717
1718 rv = 0;
1719 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1720 if (pmc->sfcount[MCAST_EXCLUDE]) {
1721 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1722 !psf->sf_count[MCAST_INCLUDE];
1723 } else
1724 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1725 if (new_in) {
1726 if (!psf->sf_oldin) {
1727 struct ip_sf_list *prev = NULL;
1728
1729 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1730 if (dpsf->sf_inaddr == psf->sf_inaddr)
1731 break;
1732 prev = dpsf;
1733 }
1734 if (dpsf) {
1735 if (prev)
1736 prev->sf_next = dpsf->sf_next;
1737 else
1738 pmc->tomb = dpsf->sf_next;
1739 kfree(dpsf);
1740 }
1741 psf->sf_crcount = qrv;
1742 rv++;
1743 }
1744 } else if (psf->sf_oldin) {
1745
1746 psf->sf_crcount = 0;
1747 /*
1748 * add or update "delete" records if an active filter
1749 * is now inactive
1750 */
1751 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1752 if (dpsf->sf_inaddr == psf->sf_inaddr)
1753 break;
1754 if (!dpsf) {
1755 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1756 if (!dpsf)
1757 continue;
1758 *dpsf = *psf;
1759 /* pmc->lock held by callers */
1760 dpsf->sf_next = pmc->tomb;
1761 pmc->tomb = dpsf;
1762 }
1763 dpsf->sf_crcount = qrv;
1764 rv++;
1765 }
1766 }
1767 return rv;
1768}
1769#endif
1770
1771/*
1772 * Add multicast source filter list to the interface list
1773 */
1774static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1775 int sfcount, __be32 *psfsrc, int delta)
1776{
1777 struct ip_mc_list *pmc;
1778 int isexclude;
1779 int i, err;
1780
1781 if (!in_dev)
1782 return -ENODEV;
1783 rcu_read_lock();
1784 for_each_pmc_rcu(in_dev, pmc) {
1785 if (*pmca == pmc->multiaddr)
1786 break;
1787 }
1788 if (!pmc) {
1789 /* MCA not found?? bug */
1790 rcu_read_unlock();
1791 return -ESRCH;
1792 }
1793 spin_lock_bh(&pmc->lock);
1794 rcu_read_unlock();
1795
1796#ifdef CONFIG_IP_MULTICAST
1797 sf_markstate(pmc);
1798#endif
1799 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1800 if (!delta)
1801 pmc->sfcount[sfmode]++;
1802 err = 0;
1803 for (i = 0; i < sfcount; i++) {
1804 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1805 if (err)
1806 break;
1807 }
1808 if (err) {
1809 int j;
1810
1811 if (!delta)
1812 pmc->sfcount[sfmode]--;
1813 for (j = 0; j < i; j++)
1814 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1815 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1816#ifdef CONFIG_IP_MULTICAST
1817 struct ip_sf_list *psf;
1818 in_dev = pmc->interface;
1819#endif
1820
1821 /* filter mode change */
1822 if (pmc->sfcount[MCAST_EXCLUDE])
1823 pmc->sfmode = MCAST_EXCLUDE;
1824 else if (pmc->sfcount[MCAST_INCLUDE])
1825 pmc->sfmode = MCAST_INCLUDE;
1826#ifdef CONFIG_IP_MULTICAST
1827 /* else no filters; keep old mode for reports */
1828
1829 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1830 IGMP_Unsolicited_Report_Count;
1831 in_dev->mr_ifc_count = pmc->crcount;
1832 for (psf = pmc->sources; psf; psf = psf->sf_next)
1833 psf->sf_crcount = 0;
1834 igmp_ifc_event(in_dev);
1835 } else if (sf_setstate(pmc)) {
1836 igmp_ifc_event(in_dev);
1837#endif
1838 }
1839 spin_unlock_bh(&pmc->lock);
1840 return err;
1841}
1842
1843static void ip_mc_clear_src(struct ip_mc_list *pmc)
1844{
1845 struct ip_sf_list *psf, *nextpsf;
1846
1847 for (psf = pmc->tomb; psf; psf = nextpsf) {
1848 nextpsf = psf->sf_next;
1849 kfree(psf);
1850 }
1851 pmc->tomb = NULL;
1852 for (psf = pmc->sources; psf; psf = nextpsf) {
1853 nextpsf = psf->sf_next;
1854 kfree(psf);
1855 }
1856 pmc->sources = NULL;
1857 pmc->sfmode = MCAST_EXCLUDE;
1858 pmc->sfcount[MCAST_INCLUDE] = 0;
1859 pmc->sfcount[MCAST_EXCLUDE] = 1;
1860}
1861
1862
1863/*
1864 * Join a multicast group
1865 */
1866int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1867{
1868 int err;
1869 __be32 addr = imr->imr_multiaddr.s_addr;
1870 struct ip_mc_socklist *iml = NULL, *i;
1871 struct in_device *in_dev;
1872 struct inet_sock *inet = inet_sk(sk);
1873 struct net *net = sock_net(sk);
1874 int ifindex;
1875 int count = 0;
1876
1877 if (!ipv4_is_multicast(addr))
1878 return -EINVAL;
1879
1880 rtnl_lock();
1881
1882 in_dev = ip_mc_find_dev(net, imr);
1883
1884 if (!in_dev) {
1885 iml = NULL;
1886 err = -ENODEV;
1887 goto done;
1888 }
1889
1890 err = -EADDRINUSE;
1891 ifindex = imr->imr_ifindex;
1892 for_each_pmc_rtnl(inet, i) {
1893 if (i->multi.imr_multiaddr.s_addr == addr &&
1894 i->multi.imr_ifindex == ifindex)
1895 goto done;
1896 count++;
1897 }
1898 err = -ENOBUFS;
1899 if (count >= sysctl_igmp_max_memberships)
1900 goto done;
1901 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1902 if (iml == NULL)
1903 goto done;
1904
1905 memcpy(&iml->multi, imr, sizeof(*imr));
1906 iml->next_rcu = inet->mc_list;
1907 iml->sflist = NULL;
1908 iml->sfmode = MCAST_EXCLUDE;
1909 rcu_assign_pointer(inet->mc_list, iml);
1910 ip_mc_inc_group(in_dev, addr);
1911 err = 0;
1912done:
1913 rtnl_unlock();
1914 return err;
1915}
1916EXPORT_SYMBOL(ip_mc_join_group);
1917
1918static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1919 struct in_device *in_dev)
1920{
1921 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1922 int err;
1923
1924 if (psf == NULL) {
1925 /* any-source empty exclude case */
1926 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1927 iml->sfmode, 0, NULL, 0);
1928 }
1929 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1930 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1931 RCU_INIT_POINTER(iml->sflist, NULL);
1932 /* decrease mem now to avoid the memleak warning */
1933 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1934 kfree_rcu(psf, rcu);
1935 return err;
1936}
1937
1938/*
1939 * Ask a socket to leave a group.
1940 */
1941
1942int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1943{
1944 struct inet_sock *inet = inet_sk(sk);
1945 struct ip_mc_socklist *iml;
1946 struct ip_mc_socklist __rcu **imlp;
1947 struct in_device *in_dev;
1948 struct net *net = sock_net(sk);
1949 __be32 group = imr->imr_multiaddr.s_addr;
1950 u32 ifindex;
1951 int ret = -EADDRNOTAVAIL;
1952
1953 rtnl_lock();
1954 in_dev = ip_mc_find_dev(net, imr);
1955 ifindex = imr->imr_ifindex;
1956 for (imlp = &inet->mc_list;
1957 (iml = rtnl_dereference(*imlp)) != NULL;
1958 imlp = &iml->next_rcu) {
1959 if (iml->multi.imr_multiaddr.s_addr != group)
1960 continue;
1961 if (ifindex) {
1962 if (iml->multi.imr_ifindex != ifindex)
1963 continue;
1964 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1965 iml->multi.imr_address.s_addr)
1966 continue;
1967
1968 (void) ip_mc_leave_src(sk, iml, in_dev);
1969
1970 *imlp = iml->next_rcu;
1971
1972 if (in_dev)
1973 ip_mc_dec_group(in_dev, group);
1974 rtnl_unlock();
1975 /* decrease mem now to avoid the memleak warning */
1976 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1977 kfree_rcu(iml, rcu);
1978 return 0;
1979 }
1980 if (!in_dev)
1981 ret = -ENODEV;
1982 rtnl_unlock();
1983 return ret;
1984}
1985EXPORT_SYMBOL(ip_mc_leave_group);
1986
1987int ip_mc_source(int add, int omode, struct sock *sk, struct
1988 ip_mreq_source *mreqs, int ifindex)
1989{
1990 int err;
1991 struct ip_mreqn imr;
1992 __be32 addr = mreqs->imr_multiaddr;
1993 struct ip_mc_socklist *pmc;
1994 struct in_device *in_dev = NULL;
1995 struct inet_sock *inet = inet_sk(sk);
1996 struct ip_sf_socklist *psl;
1997 struct net *net = sock_net(sk);
1998 int leavegroup = 0;
1999 int i, j, rv;
2000
2001 if (!ipv4_is_multicast(addr))
2002 return -EINVAL;
2003
2004 rtnl_lock();
2005
2006 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2007 imr.imr_address.s_addr = mreqs->imr_interface;
2008 imr.imr_ifindex = ifindex;
2009 in_dev = ip_mc_find_dev(net, &imr);
2010
2011 if (!in_dev) {
2012 err = -ENODEV;
2013 goto done;
2014 }
2015 err = -EADDRNOTAVAIL;
2016
2017 for_each_pmc_rtnl(inet, pmc) {
2018 if ((pmc->multi.imr_multiaddr.s_addr ==
2019 imr.imr_multiaddr.s_addr) &&
2020 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2021 break;
2022 }
2023 if (!pmc) { /* must have a prior join */
2024 err = -EINVAL;
2025 goto done;
2026 }
2027 /* if a source filter was set, must be the same mode as before */
2028 if (pmc->sflist) {
2029 if (pmc->sfmode != omode) {
2030 err = -EINVAL;
2031 goto done;
2032 }
2033 } else if (pmc->sfmode != omode) {
2034 /* allow mode switches for empty-set filters */
2035 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2036 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2037 NULL, 0);
2038 pmc->sfmode = omode;
2039 }
2040
2041 psl = rtnl_dereference(pmc->sflist);
2042 if (!add) {
2043 if (!psl)
2044 goto done; /* err = -EADDRNOTAVAIL */
2045 rv = !0;
2046 for (i = 0; i < psl->sl_count; i++) {
2047 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2048 sizeof(__be32));
2049 if (rv == 0)
2050 break;
2051 }
2052 if (rv) /* source not found */
2053 goto done; /* err = -EADDRNOTAVAIL */
2054
2055 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2056 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2057 leavegroup = 1;
2058 goto done;
2059 }
2060
2061 /* update the interface filter */
2062 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2063 &mreqs->imr_sourceaddr, 1);
2064
2065 for (j = i+1; j < psl->sl_count; j++)
2066 psl->sl_addr[j-1] = psl->sl_addr[j];
2067 psl->sl_count--;
2068 err = 0;
2069 goto done;
2070 }
2071 /* else, add a new source to the filter */
2072
2073 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2074 err = -ENOBUFS;
2075 goto done;
2076 }
2077 if (!psl || psl->sl_count == psl->sl_max) {
2078 struct ip_sf_socklist *newpsl;
2079 int count = IP_SFBLOCK;
2080
2081 if (psl)
2082 count += psl->sl_max;
2083 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2084 if (!newpsl) {
2085 err = -ENOBUFS;
2086 goto done;
2087 }
2088 newpsl->sl_max = count;
2089 newpsl->sl_count = count - IP_SFBLOCK;
2090 if (psl) {
2091 for (i = 0; i < psl->sl_count; i++)
2092 newpsl->sl_addr[i] = psl->sl_addr[i];
2093 /* decrease mem now to avoid the memleak warning */
2094 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2095 kfree_rcu(psl, rcu);
2096 }
2097 rcu_assign_pointer(pmc->sflist, newpsl);
2098 psl = newpsl;
2099 }
2100 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2101 for (i = 0; i < psl->sl_count; i++) {
2102 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2103 sizeof(__be32));
2104 if (rv == 0)
2105 break;
2106 }
2107 if (rv == 0) /* address already there is an error */
2108 goto done;
2109 for (j = psl->sl_count-1; j >= i; j--)
2110 psl->sl_addr[j+1] = psl->sl_addr[j];
2111 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2112 psl->sl_count++;
2113 err = 0;
2114 /* update the interface list */
2115 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2116 &mreqs->imr_sourceaddr, 1);
2117done:
2118 rtnl_unlock();
2119 if (leavegroup)
2120 return ip_mc_leave_group(sk, &imr);
2121 return err;
2122}
2123
2124int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2125{
2126 int err = 0;
2127 struct ip_mreqn imr;
2128 __be32 addr = msf->imsf_multiaddr;
2129 struct ip_mc_socklist *pmc;
2130 struct in_device *in_dev;
2131 struct inet_sock *inet = inet_sk(sk);
2132 struct ip_sf_socklist *newpsl, *psl;
2133 struct net *net = sock_net(sk);
2134 int leavegroup = 0;
2135
2136 if (!ipv4_is_multicast(addr))
2137 return -EINVAL;
2138 if (msf->imsf_fmode != MCAST_INCLUDE &&
2139 msf->imsf_fmode != MCAST_EXCLUDE)
2140 return -EINVAL;
2141
2142 rtnl_lock();
2143
2144 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2145 imr.imr_address.s_addr = msf->imsf_interface;
2146 imr.imr_ifindex = ifindex;
2147 in_dev = ip_mc_find_dev(net, &imr);
2148
2149 if (!in_dev) {
2150 err = -ENODEV;
2151 goto done;
2152 }
2153
2154 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2155 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2156 leavegroup = 1;
2157 goto done;
2158 }
2159
2160 for_each_pmc_rtnl(inet, pmc) {
2161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162 pmc->multi.imr_ifindex == imr.imr_ifindex)
2163 break;
2164 }
2165 if (!pmc) { /* must have a prior join */
2166 err = -EINVAL;
2167 goto done;
2168 }
2169 if (msf->imsf_numsrc) {
2170 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2171 GFP_KERNEL);
2172 if (!newpsl) {
2173 err = -ENOBUFS;
2174 goto done;
2175 }
2176 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2177 memcpy(newpsl->sl_addr, msf->imsf_slist,
2178 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2179 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2180 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2181 if (err) {
2182 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2183 goto done;
2184 }
2185 } else {
2186 newpsl = NULL;
2187 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2188 msf->imsf_fmode, 0, NULL, 0);
2189 }
2190 psl = rtnl_dereference(pmc->sflist);
2191 if (psl) {
2192 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2193 psl->sl_count, psl->sl_addr, 0);
2194 /* decrease mem now to avoid the memleak warning */
2195 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2196 kfree_rcu(psl, rcu);
2197 } else
2198 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2199 0, NULL, 0);
2200 rcu_assign_pointer(pmc->sflist, newpsl);
2201 pmc->sfmode = msf->imsf_fmode;
2202 err = 0;
2203done:
2204 rtnl_unlock();
2205 if (leavegroup)
2206 err = ip_mc_leave_group(sk, &imr);
2207 return err;
2208}
2209
2210int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2211 struct ip_msfilter __user *optval, int __user *optlen)
2212{
2213 int err, len, count, copycount;
2214 struct ip_mreqn imr;
2215 __be32 addr = msf->imsf_multiaddr;
2216 struct ip_mc_socklist *pmc;
2217 struct in_device *in_dev;
2218 struct inet_sock *inet = inet_sk(sk);
2219 struct ip_sf_socklist *psl;
2220 struct net *net = sock_net(sk);
2221
2222 if (!ipv4_is_multicast(addr))
2223 return -EINVAL;
2224
2225 rtnl_lock();
2226
2227 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2228 imr.imr_address.s_addr = msf->imsf_interface;
2229 imr.imr_ifindex = 0;
2230 in_dev = ip_mc_find_dev(net, &imr);
2231
2232 if (!in_dev) {
2233 err = -ENODEV;
2234 goto done;
2235 }
2236 err = -EADDRNOTAVAIL;
2237
2238 for_each_pmc_rtnl(inet, pmc) {
2239 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2240 pmc->multi.imr_ifindex == imr.imr_ifindex)
2241 break;
2242 }
2243 if (!pmc) /* must have a prior join */
2244 goto done;
2245 msf->imsf_fmode = pmc->sfmode;
2246 psl = rtnl_dereference(pmc->sflist);
2247 rtnl_unlock();
2248 if (!psl) {
2249 len = 0;
2250 count = 0;
2251 } else {
2252 count = psl->sl_count;
2253 }
2254 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2255 len = copycount * sizeof(psl->sl_addr[0]);
2256 msf->imsf_numsrc = count;
2257 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2258 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2259 return -EFAULT;
2260 }
2261 if (len &&
2262 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2263 return -EFAULT;
2264 return 0;
2265done:
2266 rtnl_unlock();
2267 return err;
2268}
2269
2270int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2271 struct group_filter __user *optval, int __user *optlen)
2272{
2273 int err, i, count, copycount;
2274 struct sockaddr_in *psin;
2275 __be32 addr;
2276 struct ip_mc_socklist *pmc;
2277 struct inet_sock *inet = inet_sk(sk);
2278 struct ip_sf_socklist *psl;
2279
2280 psin = (struct sockaddr_in *)&gsf->gf_group;
2281 if (psin->sin_family != AF_INET)
2282 return -EINVAL;
2283 addr = psin->sin_addr.s_addr;
2284 if (!ipv4_is_multicast(addr))
2285 return -EINVAL;
2286
2287 rtnl_lock();
2288
2289 err = -EADDRNOTAVAIL;
2290
2291 for_each_pmc_rtnl(inet, pmc) {
2292 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2293 pmc->multi.imr_ifindex == gsf->gf_interface)
2294 break;
2295 }
2296 if (!pmc) /* must have a prior join */
2297 goto done;
2298 gsf->gf_fmode = pmc->sfmode;
2299 psl = rtnl_dereference(pmc->sflist);
2300 rtnl_unlock();
2301 count = psl ? psl->sl_count : 0;
2302 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2303 gsf->gf_numsrc = count;
2304 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2305 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2306 return -EFAULT;
2307 }
2308 for (i = 0; i < copycount; i++) {
2309 struct sockaddr_storage ss;
2310
2311 psin = (struct sockaddr_in *)&ss;
2312 memset(&ss, 0, sizeof(ss));
2313 psin->sin_family = AF_INET;
2314 psin->sin_addr.s_addr = psl->sl_addr[i];
2315 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2316 return -EFAULT;
2317 }
2318 return 0;
2319done:
2320 rtnl_unlock();
2321 return err;
2322}
2323
2324/*
2325 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2326 */
2327int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2328{
2329 struct inet_sock *inet = inet_sk(sk);
2330 struct ip_mc_socklist *pmc;
2331 struct ip_sf_socklist *psl;
2332 int i;
2333 int ret;
2334
2335 ret = 1;
2336 if (!ipv4_is_multicast(loc_addr))
2337 goto out;
2338
2339 rcu_read_lock();
2340 for_each_pmc_rcu(inet, pmc) {
2341 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2342 pmc->multi.imr_ifindex == dif)
2343 break;
2344 }
2345 ret = inet->mc_all;
2346 if (!pmc)
2347 goto unlock;
2348 psl = rcu_dereference(pmc->sflist);
2349 ret = (pmc->sfmode == MCAST_EXCLUDE);
2350 if (!psl)
2351 goto unlock;
2352
2353 for (i = 0; i < psl->sl_count; i++) {
2354 if (psl->sl_addr[i] == rmt_addr)
2355 break;
2356 }
2357 ret = 0;
2358 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2359 goto unlock;
2360 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2361 goto unlock;
2362 ret = 1;
2363unlock:
2364 rcu_read_unlock();
2365out:
2366 return ret;
2367}
2368
2369/*
2370 * A socket is closing.
2371 */
2372
2373void ip_mc_drop_socket(struct sock *sk)
2374{
2375 struct inet_sock *inet = inet_sk(sk);
2376 struct ip_mc_socklist *iml;
2377 struct net *net = sock_net(sk);
2378
2379 if (inet->mc_list == NULL)
2380 return;
2381
2382 rtnl_lock();
2383 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2384 struct in_device *in_dev;
2385
2386 inet->mc_list = iml->next_rcu;
2387 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2388 (void) ip_mc_leave_src(sk, iml, in_dev);
2389 if (in_dev != NULL)
2390 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2391 /* decrease mem now to avoid the memleak warning */
2392 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2393 kfree_rcu(iml, rcu);
2394 }
2395 rtnl_unlock();
2396}
2397
2398/* called with rcu_read_lock() */
2399int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2400{
2401 struct ip_mc_list *im;
2402 struct ip_mc_list __rcu **mc_hash;
2403 struct ip_sf_list *psf;
2404 int rv = 0;
2405
2406 mc_hash = rcu_dereference(in_dev->mc_hash);
2407 if (mc_hash) {
2408 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2409
2410 for (im = rcu_dereference(mc_hash[hash]);
2411 im != NULL;
2412 im = rcu_dereference(im->next_hash)) {
2413 if (im->multiaddr == mc_addr)
2414 break;
2415 }
2416 } else {
2417 for_each_pmc_rcu(in_dev, im) {
2418 if (im->multiaddr == mc_addr)
2419 break;
2420 }
2421 }
2422 if (im && proto == IPPROTO_IGMP) {
2423 rv = 1;
2424 } else if (im) {
2425 if (src_addr) {
2426 for (psf = im->sources; psf; psf = psf->sf_next) {
2427 if (psf->sf_inaddr == src_addr)
2428 break;
2429 }
2430 if (psf)
2431 rv = psf->sf_count[MCAST_INCLUDE] ||
2432 psf->sf_count[MCAST_EXCLUDE] !=
2433 im->sfcount[MCAST_EXCLUDE];
2434 else
2435 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2436 } else
2437 rv = 1; /* unspecified source; tentatively allow */
2438 }
2439 return rv;
2440}
2441
2442#if defined(CONFIG_PROC_FS)
2443struct igmp_mc_iter_state {
2444 struct seq_net_private p;
2445 struct net_device *dev;
2446 struct in_device *in_dev;
2447};
2448
2449#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2450
2451static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2452{
2453 struct net *net = seq_file_net(seq);
2454 struct ip_mc_list *im = NULL;
2455 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2456
2457 state->in_dev = NULL;
2458 for_each_netdev_rcu(net, state->dev) {
2459 struct in_device *in_dev;
2460
2461 in_dev = __in_dev_get_rcu(state->dev);
2462 if (!in_dev)
2463 continue;
2464 im = rcu_dereference(in_dev->mc_list);
2465 if (im) {
2466 state->in_dev = in_dev;
2467 break;
2468 }
2469 }
2470 return im;
2471}
2472
2473static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2474{
2475 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2476
2477 im = rcu_dereference(im->next_rcu);
2478 while (!im) {
2479 state->dev = next_net_device_rcu(state->dev);
2480 if (!state->dev) {
2481 state->in_dev = NULL;
2482 break;
2483 }
2484 state->in_dev = __in_dev_get_rcu(state->dev);
2485 if (!state->in_dev)
2486 continue;
2487 im = rcu_dereference(state->in_dev->mc_list);
2488 }
2489 return im;
2490}
2491
2492static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2493{
2494 struct ip_mc_list *im = igmp_mc_get_first(seq);
2495 if (im)
2496 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2497 --pos;
2498 return pos ? NULL : im;
2499}
2500
2501static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2502 __acquires(rcu)
2503{
2504 rcu_read_lock();
2505 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2506}
2507
2508static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2509{
2510 struct ip_mc_list *im;
2511 if (v == SEQ_START_TOKEN)
2512 im = igmp_mc_get_first(seq);
2513 else
2514 im = igmp_mc_get_next(seq, v);
2515 ++*pos;
2516 return im;
2517}
2518
2519static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2520 __releases(rcu)
2521{
2522 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2523
2524 state->in_dev = NULL;
2525 state->dev = NULL;
2526 rcu_read_unlock();
2527}
2528
2529static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2530{
2531 if (v == SEQ_START_TOKEN)
2532 seq_puts(seq,
2533 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2534 else {
2535 struct ip_mc_list *im = (struct ip_mc_list *)v;
2536 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2537 char *querier;
2538 long delta;
2539
2540#ifdef CONFIG_IP_MULTICAST
2541 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2542 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2543 "V3";
2544#else
2545 querier = "NONE";
2546#endif
2547
2548 if (rcu_dereference(state->in_dev->mc_list) == im) {
2549 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2550 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2551 }
2552
2553 delta = im->timer.expires - jiffies;
2554 seq_printf(seq,
2555 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2556 im->multiaddr, im->users,
2557 im->tm_running,
2558 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2559 im->reporter);
2560 }
2561 return 0;
2562}
2563
2564static const struct seq_operations igmp_mc_seq_ops = {
2565 .start = igmp_mc_seq_start,
2566 .next = igmp_mc_seq_next,
2567 .stop = igmp_mc_seq_stop,
2568 .show = igmp_mc_seq_show,
2569};
2570
2571static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2572{
2573 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2574 sizeof(struct igmp_mc_iter_state));
2575}
2576
2577static const struct file_operations igmp_mc_seq_fops = {
2578 .owner = THIS_MODULE,
2579 .open = igmp_mc_seq_open,
2580 .read = seq_read,
2581 .llseek = seq_lseek,
2582 .release = seq_release_net,
2583};
2584
2585struct igmp_mcf_iter_state {
2586 struct seq_net_private p;
2587 struct net_device *dev;
2588 struct in_device *idev;
2589 struct ip_mc_list *im;
2590};
2591
2592#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2593
2594static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2595{
2596 struct net *net = seq_file_net(seq);
2597 struct ip_sf_list *psf = NULL;
2598 struct ip_mc_list *im = NULL;
2599 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2600
2601 state->idev = NULL;
2602 state->im = NULL;
2603 for_each_netdev_rcu(net, state->dev) {
2604 struct in_device *idev;
2605 idev = __in_dev_get_rcu(state->dev);
2606 if (unlikely(idev == NULL))
2607 continue;
2608 im = rcu_dereference(idev->mc_list);
2609 if (likely(im != NULL)) {
2610 spin_lock_bh(&im->lock);
2611 psf = im->sources;
2612 if (likely(psf != NULL)) {
2613 state->im = im;
2614 state->idev = idev;
2615 break;
2616 }
2617 spin_unlock_bh(&im->lock);
2618 }
2619 }
2620 return psf;
2621}
2622
2623static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2624{
2625 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2626
2627 psf = psf->sf_next;
2628 while (!psf) {
2629 spin_unlock_bh(&state->im->lock);
2630 state->im = state->im->next;
2631 while (!state->im) {
2632 state->dev = next_net_device_rcu(state->dev);
2633 if (!state->dev) {
2634 state->idev = NULL;
2635 goto out;
2636 }
2637 state->idev = __in_dev_get_rcu(state->dev);
2638 if (!state->idev)
2639 continue;
2640 state->im = rcu_dereference(state->idev->mc_list);
2641 }
2642 if (!state->im)
2643 break;
2644 spin_lock_bh(&state->im->lock);
2645 psf = state->im->sources;
2646 }
2647out:
2648 return psf;
2649}
2650
2651static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2652{
2653 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2654 if (psf)
2655 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2656 --pos;
2657 return pos ? NULL : psf;
2658}
2659
2660static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2661 __acquires(rcu)
2662{
2663 rcu_read_lock();
2664 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2665}
2666
2667static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2668{
2669 struct ip_sf_list *psf;
2670 if (v == SEQ_START_TOKEN)
2671 psf = igmp_mcf_get_first(seq);
2672 else
2673 psf = igmp_mcf_get_next(seq, v);
2674 ++*pos;
2675 return psf;
2676}
2677
2678static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2679 __releases(rcu)
2680{
2681 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2682 if (likely(state->im != NULL)) {
2683 spin_unlock_bh(&state->im->lock);
2684 state->im = NULL;
2685 }
2686 state->idev = NULL;
2687 state->dev = NULL;
2688 rcu_read_unlock();
2689}
2690
2691static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2692{
2693 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2694 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2695
2696 if (v == SEQ_START_TOKEN) {
2697 seq_printf(seq,
2698 "%3s %6s "
2699 "%10s %10s %6s %6s\n", "Idx",
2700 "Device", "MCA",
2701 "SRC", "INC", "EXC");
2702 } else {
2703 seq_printf(seq,
2704 "%3d %6.6s 0x%08x "
2705 "0x%08x %6lu %6lu\n",
2706 state->dev->ifindex, state->dev->name,
2707 ntohl(state->im->multiaddr),
2708 ntohl(psf->sf_inaddr),
2709 psf->sf_count[MCAST_INCLUDE],
2710 psf->sf_count[MCAST_EXCLUDE]);
2711 }
2712 return 0;
2713}
2714
2715static const struct seq_operations igmp_mcf_seq_ops = {
2716 .start = igmp_mcf_seq_start,
2717 .next = igmp_mcf_seq_next,
2718 .stop = igmp_mcf_seq_stop,
2719 .show = igmp_mcf_seq_show,
2720};
2721
2722static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2723{
2724 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2725 sizeof(struct igmp_mcf_iter_state));
2726}
2727
2728static const struct file_operations igmp_mcf_seq_fops = {
2729 .owner = THIS_MODULE,
2730 .open = igmp_mcf_seq_open,
2731 .read = seq_read,
2732 .llseek = seq_lseek,
2733 .release = seq_release_net,
2734};
2735
2736static int __net_init igmp_net_init(struct net *net)
2737{
2738 struct proc_dir_entry *pde;
2739
2740 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2741 if (!pde)
2742 goto out_igmp;
2743 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2744 &igmp_mcf_seq_fops);
2745 if (!pde)
2746 goto out_mcfilter;
2747 return 0;
2748
2749out_mcfilter:
2750 remove_proc_entry("igmp", net->proc_net);
2751out_igmp:
2752 return -ENOMEM;
2753}
2754
2755static void __net_exit igmp_net_exit(struct net *net)
2756{
2757 remove_proc_entry("mcfilter", net->proc_net);
2758 remove_proc_entry("igmp", net->proc_net);
2759}
2760
2761static struct pernet_operations igmp_net_ops = {
2762 .init = igmp_net_init,
2763 .exit = igmp_net_exit,
2764};
2765#endif
2766
2767static int igmp_netdev_event(struct notifier_block *this,
2768 unsigned long event, void *ptr)
2769{
2770 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2771 struct in_device *in_dev;
2772
2773 switch (event) {
2774 case NETDEV_RESEND_IGMP:
2775 in_dev = __in_dev_get_rtnl(dev);
2776 if (in_dev)
2777 ip_mc_rejoin_groups(in_dev);
2778 break;
2779 default:
2780 break;
2781 }
2782 return NOTIFY_DONE;
2783}
2784
2785static struct notifier_block igmp_notifier = {
2786 .notifier_call = igmp_netdev_event,
2787};
2788
2789int __init igmp_mc_init(void)
2790{
2791#if defined(CONFIG_PROC_FS)
2792 int err;
2793
2794 err = register_pernet_subsys(&igmp_net_ops);
2795 if (err)
2796 return err;
2797 err = register_netdevice_notifier(&igmp_notifier);
2798 if (err)
2799 goto reg_notif_fail;
2800 return 0;
2801
2802reg_notif_fail:
2803 unregister_pernet_subsys(&igmp_net_ops);
2804 return err;
2805#else
2806 return register_netdevice_notifier(&igmp_notifier);
2807#endif
2808}