2 * Linux NET3: Internet Group Management Protocol [IGMP]
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.
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.
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
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.
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
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
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"
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
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
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <linux/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>
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>
93 #include <net/net_namespace.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
99 #include <net/checksum.h>
100 #include <net/inet_common.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
110 #ifdef CONFIG_IP_MULTICAST
111 /* Parameter names and values are taken from igmp-v2-06 draft */
113 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
114 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
115 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
116 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
118 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
121 #define IGMP_INITIAL_REPORT_DELAY (1)
123 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
141 static int unsolicited_report_interval(struct in_device *in_dev)
143 int interval_ms, interval_jiffies;
145 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
146 interval_ms = IN_DEV_CONF_GET(
148 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
150 interval_ms = IN_DEV_CONF_GET(
152 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
154 interval_jiffies = msecs_to_jiffies(interval_ms);
156 /* _timer functions can't handle a delay of 0 jiffies so ensure
157 * we always return a positive value.
159 if (interval_jiffies <= 0)
160 interval_jiffies = 1;
161 return interval_jiffies;
164 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
165 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
166 static void igmpv3_clear_delrec(struct in_device *in_dev);
167 static int sf_setstate(struct ip_mc_list *pmc);
168 static void sf_markstate(struct ip_mc_list *pmc);
170 static void ip_mc_clear_src(struct ip_mc_list *pmc);
171 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
172 int sfcount, __be32 *psfsrc, int delta);
174 static void ip_ma_put(struct ip_mc_list *im)
176 if (atomic_dec_and_test(&im->refcnt)) {
177 in_dev_put(im->interface);
182 #define for_each_pmc_rcu(in_dev, pmc) \
183 for (pmc = rcu_dereference(in_dev->mc_list); \
185 pmc = rcu_dereference(pmc->next_rcu))
187 #define for_each_pmc_rtnl(in_dev, pmc) \
188 for (pmc = rtnl_dereference(in_dev->mc_list); \
190 pmc = rtnl_dereference(pmc->next_rcu))
192 #ifdef CONFIG_IP_MULTICAST
198 static void igmp_stop_timer(struct ip_mc_list *im)
200 spin_lock_bh(&im->lock);
201 if (del_timer(&im->timer))
202 atomic_dec(&im->refcnt);
205 im->unsolicit_count = 0;
206 spin_unlock_bh(&im->lock);
209 /* It must be called with locked im->lock */
210 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
212 int tv = prandom_u32() % max_delay;
215 if (!mod_timer(&im->timer, jiffies+tv+2))
216 atomic_inc(&im->refcnt);
219 static void igmp_gq_start_timer(struct in_device *in_dev)
221 int tv = prandom_u32() % in_dev->mr_maxdelay;
222 unsigned long exp = jiffies + tv + 2;
224 if (in_dev->mr_gq_running &&
225 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
228 in_dev->mr_gq_running = 1;
229 if (!mod_timer(&in_dev->mr_gq_timer, exp))
233 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
235 int tv = prandom_u32() % delay;
237 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
241 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
243 spin_lock_bh(&im->lock);
244 im->unsolicit_count = 0;
245 if (del_timer(&im->timer)) {
246 if ((long)(im->timer.expires-jiffies) < max_delay) {
247 add_timer(&im->timer);
249 spin_unlock_bh(&im->lock);
252 atomic_dec(&im->refcnt);
254 igmp_start_timer(im, max_delay);
255 spin_unlock_bh(&im->lock);
260 * Send an IGMP report.
263 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
266 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
267 int gdeleted, int sdeleted)
270 case IGMPV3_MODE_IS_INCLUDE:
271 case IGMPV3_MODE_IS_EXCLUDE:
272 if (gdeleted || sdeleted)
274 if (!(pmc->gsquery && !psf->sf_gsresp)) {
275 if (pmc->sfmode == MCAST_INCLUDE)
277 /* don't include if this source is excluded
280 if (psf->sf_count[MCAST_INCLUDE])
281 return type == IGMPV3_MODE_IS_INCLUDE;
282 return pmc->sfcount[MCAST_EXCLUDE] ==
283 psf->sf_count[MCAST_EXCLUDE];
286 case IGMPV3_CHANGE_TO_INCLUDE:
287 if (gdeleted || sdeleted)
289 return psf->sf_count[MCAST_INCLUDE] != 0;
290 case IGMPV3_CHANGE_TO_EXCLUDE:
291 if (gdeleted || sdeleted)
293 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
294 psf->sf_count[MCAST_INCLUDE])
296 return pmc->sfcount[MCAST_EXCLUDE] ==
297 psf->sf_count[MCAST_EXCLUDE];
298 case IGMPV3_ALLOW_NEW_SOURCES:
299 if (gdeleted || !psf->sf_crcount)
301 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
302 case IGMPV3_BLOCK_OLD_SOURCES:
303 if (pmc->sfmode == MCAST_INCLUDE)
304 return gdeleted || (psf->sf_crcount && sdeleted);
305 return psf->sf_crcount && !gdeleted && !sdeleted;
311 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
313 struct ip_sf_list *psf;
316 for (psf = pmc->sources; psf; psf = psf->sf_next) {
317 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
324 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
329 struct igmpv3_report *pig;
330 struct net *net = dev_net(dev);
332 int hlen = LL_RESERVED_SPACE(dev);
333 int tlen = dev->needed_tailroom;
334 unsigned int size = mtu;
337 skb = alloc_skb(size + hlen + tlen,
338 GFP_ATOMIC | __GFP_NOWARN);
345 skb->priority = TC_PRIO_CONTROL;
347 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
349 IPPROTO_IGMP, 0, dev->ifindex);
355 skb_dst_set(skb, &rt->dst);
358 skb_reserve(skb, hlen);
359 skb_tailroom_reserve(skb, mtu, tlen);
361 skb_reset_network_header(skb);
363 skb_put(skb, sizeof(struct iphdr) + 4);
366 pip->ihl = (sizeof(struct iphdr)+4)>>2;
368 pip->frag_off = htons(IP_DF);
370 pip->daddr = fl4.daddr;
371 pip->saddr = fl4.saddr;
372 pip->protocol = IPPROTO_IGMP;
373 pip->tot_len = 0; /* filled in later */
374 ip_select_ident(net, skb, NULL);
375 ((u8 *)&pip[1])[0] = IPOPT_RA;
376 ((u8 *)&pip[1])[1] = 4;
377 ((u8 *)&pip[1])[2] = 0;
378 ((u8 *)&pip[1])[3] = 0;
380 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
381 skb_put(skb, sizeof(*pig));
382 pig = igmpv3_report_hdr(skb);
383 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
391 static int igmpv3_sendpack(struct sk_buff *skb)
393 struct igmphdr *pig = igmp_hdr(skb);
394 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
396 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
398 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
401 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
403 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
406 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
407 int type, struct igmpv3_grec **ppgr)
409 struct net_device *dev = pmc->interface->dev;
410 struct igmpv3_report *pih;
411 struct igmpv3_grec *pgr;
414 skb = igmpv3_newpack(dev, dev->mtu);
417 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
418 pgr->grec_type = type;
419 pgr->grec_auxwords = 0;
421 pgr->grec_mca = pmc->multiaddr;
422 pih = igmpv3_report_hdr(skb);
423 pih->ngrec = htons(ntohs(pih->ngrec)+1);
428 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
430 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
431 int type, int gdeleted, int sdeleted)
433 struct net_device *dev = pmc->interface->dev;
434 struct net *net = dev_net(dev);
435 struct igmpv3_report *pih;
436 struct igmpv3_grec *pgr = NULL;
437 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
438 int scount, stotal, first, isquery, truncate;
440 if (pmc->multiaddr == IGMP_ALL_HOSTS)
442 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
445 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
446 type == IGMPV3_MODE_IS_EXCLUDE;
447 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
448 type == IGMPV3_CHANGE_TO_EXCLUDE;
452 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
457 pih = skb ? igmpv3_report_hdr(skb) : NULL;
459 /* EX and TO_EX get a fresh packet, if needed */
461 if (pih && pih->ngrec &&
462 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
464 igmpv3_sendpack(skb);
465 skb = igmpv3_newpack(dev, dev->mtu);
470 for (psf = *psf_list; psf; psf = psf_next) {
473 psf_next = psf->sf_next;
475 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
480 /* Based on RFC3376 5.1. Should not send source-list change
481 * records when there is a filter mode change.
483 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
484 (!gdeleted && pmc->crcount)) &&
485 (type == IGMPV3_ALLOW_NEW_SOURCES ||
486 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
487 goto decrease_sf_crcount;
489 /* clear marks on query responses */
493 if (AVAILABLE(skb) < sizeof(__be32) +
494 first*sizeof(struct igmpv3_grec)) {
495 if (truncate && !first)
496 break; /* truncate these */
498 pgr->grec_nsrcs = htons(scount);
500 igmpv3_sendpack(skb);
501 skb = igmpv3_newpack(dev, dev->mtu);
506 skb = add_grhead(skb, pmc, type, &pgr);
511 psrc = skb_put(skb, sizeof(__be32));
512 *psrc = psf->sf_inaddr;
514 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
515 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
518 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
520 psf_prev->sf_next = psf->sf_next;
522 *psf_list = psf->sf_next;
532 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
533 type == IGMPV3_BLOCK_OLD_SOURCES)
535 if (pmc->crcount || isquery) {
536 /* make sure we have room for group header */
537 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
538 igmpv3_sendpack(skb);
539 skb = NULL; /* add_grhead will get a new one */
541 skb = add_grhead(skb, pmc, type, &pgr);
545 pgr->grec_nsrcs = htons(scount);
548 pmc->gsquery = 0; /* clear query state on report */
552 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
554 struct sk_buff *skb = NULL;
555 struct net *net = dev_net(in_dev->dev);
560 for_each_pmc_rcu(in_dev, pmc) {
561 if (pmc->multiaddr == IGMP_ALL_HOSTS)
563 if (ipv4_is_local_multicast(pmc->multiaddr) &&
564 !net->ipv4.sysctl_igmp_llm_reports)
566 spin_lock_bh(&pmc->lock);
567 if (pmc->sfcount[MCAST_EXCLUDE])
568 type = IGMPV3_MODE_IS_EXCLUDE;
570 type = IGMPV3_MODE_IS_INCLUDE;
571 skb = add_grec(skb, pmc, type, 0, 0);
572 spin_unlock_bh(&pmc->lock);
576 spin_lock_bh(&pmc->lock);
577 if (pmc->sfcount[MCAST_EXCLUDE])
578 type = IGMPV3_MODE_IS_EXCLUDE;
580 type = IGMPV3_MODE_IS_INCLUDE;
581 skb = add_grec(skb, pmc, type, 0, 0);
582 spin_unlock_bh(&pmc->lock);
586 return igmpv3_sendpack(skb);
590 * remove zero-count source records from a source filter list
592 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
594 struct ip_sf_list *psf_prev, *psf_next, *psf;
597 for (psf = *ppsf; psf; psf = psf_next) {
598 psf_next = psf->sf_next;
599 if (psf->sf_crcount == 0) {
601 psf_prev->sf_next = psf->sf_next;
603 *ppsf = psf->sf_next;
610 static void igmpv3_send_cr(struct in_device *in_dev)
612 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
613 struct sk_buff *skb = NULL;
617 spin_lock_bh(&in_dev->mc_tomb_lock);
621 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
622 pmc_next = pmc->next;
623 if (pmc->sfmode == MCAST_INCLUDE) {
624 type = IGMPV3_BLOCK_OLD_SOURCES;
625 dtype = IGMPV3_BLOCK_OLD_SOURCES;
626 skb = add_grec(skb, pmc, type, 1, 0);
627 skb = add_grec(skb, pmc, dtype, 1, 1);
630 if (pmc->sfmode == MCAST_EXCLUDE) {
631 type = IGMPV3_CHANGE_TO_INCLUDE;
632 skb = add_grec(skb, pmc, type, 1, 0);
635 if (pmc->crcount == 0) {
636 igmpv3_clear_zeros(&pmc->tomb);
637 igmpv3_clear_zeros(&pmc->sources);
640 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
642 pmc_prev->next = pmc_next;
644 in_dev->mc_tomb = pmc_next;
645 in_dev_put(pmc->interface);
650 spin_unlock_bh(&in_dev->mc_tomb_lock);
653 for_each_pmc_rcu(in_dev, pmc) {
654 spin_lock_bh(&pmc->lock);
655 if (pmc->sfcount[MCAST_EXCLUDE]) {
656 type = IGMPV3_BLOCK_OLD_SOURCES;
657 dtype = IGMPV3_ALLOW_NEW_SOURCES;
659 type = IGMPV3_ALLOW_NEW_SOURCES;
660 dtype = IGMPV3_BLOCK_OLD_SOURCES;
662 skb = add_grec(skb, pmc, type, 0, 0);
663 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
665 /* filter mode changes */
667 if (pmc->sfmode == MCAST_EXCLUDE)
668 type = IGMPV3_CHANGE_TO_EXCLUDE;
670 type = IGMPV3_CHANGE_TO_INCLUDE;
671 skb = add_grec(skb, pmc, type, 0, 0);
674 spin_unlock_bh(&pmc->lock);
680 (void) igmpv3_sendpack(skb);
683 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
690 struct net_device *dev = in_dev->dev;
691 struct net *net = dev_net(dev);
692 __be32 group = pmc ? pmc->multiaddr : 0;
697 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
698 return igmpv3_send_report(in_dev, pmc);
700 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
703 if (type == IGMP_HOST_LEAVE_MESSAGE)
704 dst = IGMP_ALL_ROUTER;
708 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
710 IPPROTO_IGMP, 0, dev->ifindex);
714 hlen = LL_RESERVED_SPACE(dev);
715 tlen = dev->needed_tailroom;
716 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
721 skb->priority = TC_PRIO_CONTROL;
723 skb_dst_set(skb, &rt->dst);
725 skb_reserve(skb, hlen);
727 skb_reset_network_header(skb);
729 skb_put(skb, sizeof(struct iphdr) + 4);
732 iph->ihl = (sizeof(struct iphdr)+4)>>2;
734 iph->frag_off = htons(IP_DF);
737 iph->saddr = fl4.saddr;
738 iph->protocol = IPPROTO_IGMP;
739 ip_select_ident(net, skb, NULL);
740 ((u8 *)&iph[1])[0] = IPOPT_RA;
741 ((u8 *)&iph[1])[1] = 4;
742 ((u8 *)&iph[1])[2] = 0;
743 ((u8 *)&iph[1])[3] = 0;
745 ih = skb_put(skb, sizeof(struct igmphdr));
750 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
752 return ip_local_out(net, skb->sk, skb);
755 static void igmp_gq_timer_expire(unsigned long data)
757 struct in_device *in_dev = (struct in_device *)data;
759 in_dev->mr_gq_running = 0;
760 igmpv3_send_report(in_dev, NULL);
764 static void igmp_ifc_timer_expire(unsigned long data)
766 struct in_device *in_dev = (struct in_device *)data;
768 igmpv3_send_cr(in_dev);
769 if (in_dev->mr_ifc_count) {
770 in_dev->mr_ifc_count--;
771 igmp_ifc_start_timer(in_dev,
772 unsolicited_report_interval(in_dev));
777 static void igmp_ifc_event(struct in_device *in_dev)
779 struct net *net = dev_net(in_dev->dev);
780 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
782 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
783 igmp_ifc_start_timer(in_dev, 1);
787 static void igmp_timer_expire(unsigned long data)
789 struct ip_mc_list *im = (struct ip_mc_list *)data;
790 struct in_device *in_dev = im->interface;
792 spin_lock(&im->lock);
795 if (im->unsolicit_count) {
796 im->unsolicit_count--;
797 igmp_start_timer(im, unsolicited_report_interval(in_dev));
800 spin_unlock(&im->lock);
802 if (IGMP_V1_SEEN(in_dev))
803 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
804 else if (IGMP_V2_SEEN(in_dev))
805 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
807 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
812 /* mark EXCLUDE-mode sources */
813 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
815 struct ip_sf_list *psf;
819 for (psf = pmc->sources; psf; psf = psf->sf_next) {
822 for (i = 0; i < nsrcs; i++) {
823 /* skip inactive filters */
824 if (psf->sf_count[MCAST_INCLUDE] ||
825 pmc->sfcount[MCAST_EXCLUDE] !=
826 psf->sf_count[MCAST_EXCLUDE])
828 if (srcs[i] == psf->sf_inaddr) {
835 if (scount == nsrcs) /* all sources excluded */
840 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
842 struct ip_sf_list *psf;
845 if (pmc->sfmode == MCAST_EXCLUDE)
846 return igmp_xmarksources(pmc, nsrcs, srcs);
848 /* mark INCLUDE-mode sources */
850 for (psf = pmc->sources; psf; psf = psf->sf_next) {
853 for (i = 0; i < nsrcs; i++)
854 if (srcs[i] == psf->sf_inaddr) {
868 /* return true if packet was dropped */
869 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
871 struct ip_mc_list *im;
872 struct net *net = dev_net(in_dev->dev);
874 /* Timers are only set for non-local groups */
876 if (group == IGMP_ALL_HOSTS)
878 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
882 for_each_pmc_rcu(in_dev, im) {
883 if (im->multiaddr == group) {
892 /* return true if packet was dropped */
893 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
896 struct igmphdr *ih = igmp_hdr(skb);
897 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
898 struct ip_mc_list *im;
899 __be32 group = ih->group;
902 struct net *net = dev_net(in_dev->dev);
907 /* Alas, old v1 router presents here. */
909 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
910 in_dev->mr_v1_seen = jiffies +
911 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
914 /* v2 router present */
915 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
916 in_dev->mr_v2_seen = jiffies +
917 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
919 /* cancel the interface change timer */
920 in_dev->mr_ifc_count = 0;
921 if (del_timer(&in_dev->mr_ifc_timer))
922 __in_dev_put(in_dev);
923 /* clear deleted report items */
924 igmpv3_clear_delrec(in_dev);
925 } else if (len < 12) {
926 return true; /* ignore bogus packet; freed by caller */
927 } else if (IGMP_V1_SEEN(in_dev)) {
928 /* This is a v3 query with v1 queriers present */
929 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
931 } else if (IGMP_V2_SEEN(in_dev)) {
932 /* this is a v3 query with v2 queriers present;
933 * Interpretation of the max_delay code is problematic here.
934 * A real v2 host would use ih_code directly, while v3 has a
935 * different encoding. We use the v3 encoding as more likely
936 * to be intended in a v3 query.
938 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
940 max_delay = 1; /* can't mod w/ 0 */
942 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
945 ih3 = igmpv3_query_hdr(skb);
947 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
948 + ntohs(ih3->nsrcs)*sizeof(__be32)))
950 ih3 = igmpv3_query_hdr(skb);
953 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
955 max_delay = 1; /* can't mod w/ 0 */
956 in_dev->mr_maxdelay = max_delay;
958 in_dev->mr_qrv = ih3->qrv;
959 if (!group) { /* general query */
961 return true; /* no sources allowed */
962 igmp_gq_start_timer(in_dev);
965 /* mark sources to include, if group & source-specific */
966 mark = ih3->nsrcs != 0;
970 * - Start the timers in all of our membership records
971 * that the query applies to for the interface on
972 * which the query arrived excl. those that belong
973 * to a "local" group (224.0.0.X)
974 * - For timers already running check if they need to
976 * - Use the igmp->igmp_code field as the maximum
980 for_each_pmc_rcu(in_dev, im) {
983 if (group && group != im->multiaddr)
985 if (im->multiaddr == IGMP_ALL_HOSTS)
987 if (ipv4_is_local_multicast(im->multiaddr) &&
988 !net->ipv4.sysctl_igmp_llm_reports)
990 spin_lock_bh(&im->lock);
992 im->gsquery = im->gsquery && mark;
995 changed = !im->gsquery ||
996 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
997 spin_unlock_bh(&im->lock);
999 igmp_mod_timer(im, max_delay);
1005 /* called in rcu_read_lock() section */
1006 int igmp_rcv(struct sk_buff *skb)
1008 /* This basically follows the spec line by line -- see RFC1112 */
1010 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1012 bool dropped = true;
1017 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1020 if (skb_checksum_simple_validate(skb))
1025 case IGMP_HOST_MEMBERSHIP_QUERY:
1026 dropped = igmp_heard_query(in_dev, skb, len);
1028 case IGMP_HOST_MEMBERSHIP_REPORT:
1029 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1030 /* Is it our report looped back? */
1031 if (rt_is_output_route(skb_rtable(skb)))
1033 /* don't rely on MC router hearing unicast reports */
1034 if (skb->pkt_type == PACKET_MULTICAST ||
1035 skb->pkt_type == PACKET_BROADCAST)
1036 dropped = igmp_heard_report(in_dev, ih->group);
1039 #ifdef CONFIG_IP_PIMSM_V1
1040 return pim_rcv_v1(skb);
1042 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1045 case IGMP_HOST_LEAVE_MESSAGE:
1047 case IGMP_MTRACE_RESP:
1065 * Add a filter to a device
1068 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1070 char buf[MAX_ADDR_LEN];
1071 struct net_device *dev = in_dev->dev;
1073 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1074 We will get multicast token leakage, when IFF_MULTICAST
1075 is changed. This check should be done in ndo_set_rx_mode
1076 routine. Something sort of:
1077 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1080 if (arp_mc_map(addr, buf, dev, 0) == 0)
1081 dev_mc_add(dev, buf);
1085 * Remove a filter from a device
1088 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1090 char buf[MAX_ADDR_LEN];
1091 struct net_device *dev = in_dev->dev;
1093 if (arp_mc_map(addr, buf, dev, 0) == 0)
1094 dev_mc_del(dev, buf);
1097 #ifdef CONFIG_IP_MULTICAST
1099 * deleted ip_mc_list manipulation
1101 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1103 struct ip_mc_list *pmc;
1104 struct net *net = dev_net(in_dev->dev);
1106 /* this is an "ip_mc_list" for convenience; only the fields below
1107 * are actually used. In particular, the refcnt and users are not
1108 * used for management of the delete list. Using the same structure
1109 * for deleted items allows change reports to use common code with
1110 * non-deleted or query-response MCA's.
1112 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1115 spin_lock_init(&pmc->lock);
1116 spin_lock_bh(&im->lock);
1117 pmc->interface = im->interface;
1118 in_dev_hold(in_dev);
1119 pmc->multiaddr = im->multiaddr;
1120 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1121 pmc->sfmode = im->sfmode;
1122 if (pmc->sfmode == MCAST_INCLUDE) {
1123 struct ip_sf_list *psf;
1125 pmc->tomb = im->tomb;
1126 pmc->sources = im->sources;
1127 im->tomb = im->sources = NULL;
1128 for (psf = pmc->sources; psf; psf = psf->sf_next)
1129 psf->sf_crcount = pmc->crcount;
1131 spin_unlock_bh(&im->lock);
1133 spin_lock_bh(&in_dev->mc_tomb_lock);
1134 pmc->next = in_dev->mc_tomb;
1135 in_dev->mc_tomb = pmc;
1136 spin_unlock_bh(&in_dev->mc_tomb_lock);
1140 * restore ip_mc_list deleted records
1142 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1144 struct ip_mc_list *pmc, *pmc_prev;
1145 struct ip_sf_list *psf;
1146 struct net *net = dev_net(in_dev->dev);
1147 __be32 multiaddr = im->multiaddr;
1149 spin_lock_bh(&in_dev->mc_tomb_lock);
1151 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1152 if (pmc->multiaddr == multiaddr)
1158 pmc_prev->next = pmc->next;
1160 in_dev->mc_tomb = pmc->next;
1162 spin_unlock_bh(&in_dev->mc_tomb_lock);
1164 spin_lock_bh(&im->lock);
1166 im->interface = pmc->interface;
1167 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1168 im->sfmode = pmc->sfmode;
1169 if (pmc->sfmode == MCAST_INCLUDE) {
1170 im->tomb = pmc->tomb;
1171 im->sources = pmc->sources;
1172 for (psf = im->sources; psf; psf = psf->sf_next)
1173 psf->sf_crcount = im->crcount;
1175 in_dev_put(pmc->interface);
1178 spin_unlock_bh(&im->lock);
1182 * flush ip_mc_list deleted records
1184 static void igmpv3_clear_delrec(struct in_device *in_dev)
1186 struct ip_mc_list *pmc, *nextpmc;
1188 spin_lock_bh(&in_dev->mc_tomb_lock);
1189 pmc = in_dev->mc_tomb;
1190 in_dev->mc_tomb = NULL;
1191 spin_unlock_bh(&in_dev->mc_tomb_lock);
1193 for (; pmc; pmc = nextpmc) {
1194 nextpmc = pmc->next;
1195 ip_mc_clear_src(pmc);
1196 in_dev_put(pmc->interface);
1199 /* clear dead sources, too */
1201 for_each_pmc_rcu(in_dev, pmc) {
1202 struct ip_sf_list *psf, *psf_next;
1204 spin_lock_bh(&pmc->lock);
1207 spin_unlock_bh(&pmc->lock);
1208 for (; psf; psf = psf_next) {
1209 psf_next = psf->sf_next;
1217 static void igmp_group_dropped(struct ip_mc_list *im)
1219 struct in_device *in_dev = im->interface;
1220 #ifdef CONFIG_IP_MULTICAST
1221 struct net *net = dev_net(in_dev->dev);
1227 ip_mc_filter_del(in_dev, im->multiaddr);
1230 #ifdef CONFIG_IP_MULTICAST
1231 if (im->multiaddr == IGMP_ALL_HOSTS)
1233 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1236 reporter = im->reporter;
1237 igmp_stop_timer(im);
1239 if (!in_dev->dead) {
1240 if (IGMP_V1_SEEN(in_dev))
1242 if (IGMP_V2_SEEN(in_dev)) {
1244 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1248 igmpv3_add_delrec(in_dev, im);
1250 igmp_ifc_event(in_dev);
1255 static void igmp_group_added(struct ip_mc_list *im)
1257 struct in_device *in_dev = im->interface;
1258 #ifdef CONFIG_IP_MULTICAST
1259 struct net *net = dev_net(in_dev->dev);
1262 if (im->loaded == 0) {
1264 ip_mc_filter_add(in_dev, im->multiaddr);
1267 #ifdef CONFIG_IP_MULTICAST
1268 if (im->multiaddr == IGMP_ALL_HOSTS)
1270 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1275 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1276 spin_lock_bh(&im->lock);
1277 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1278 spin_unlock_bh(&im->lock);
1283 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1284 igmp_ifc_event(in_dev);
1290 * Multicast list managers
1293 static u32 ip_mc_hash(const struct ip_mc_list *im)
1295 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1298 static void ip_mc_hash_add(struct in_device *in_dev,
1299 struct ip_mc_list *im)
1301 struct ip_mc_list __rcu **mc_hash;
1304 mc_hash = rtnl_dereference(in_dev->mc_hash);
1306 hash = ip_mc_hash(im);
1307 im->next_hash = mc_hash[hash];
1308 rcu_assign_pointer(mc_hash[hash], im);
1312 /* do not use a hash table for small number of items */
1313 if (in_dev->mc_count < 4)
1316 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1321 for_each_pmc_rtnl(in_dev, im) {
1322 hash = ip_mc_hash(im);
1323 im->next_hash = mc_hash[hash];
1324 RCU_INIT_POINTER(mc_hash[hash], im);
1327 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1330 static void ip_mc_hash_remove(struct in_device *in_dev,
1331 struct ip_mc_list *im)
1333 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1334 struct ip_mc_list *aux;
1338 mc_hash += ip_mc_hash(im);
1339 while ((aux = rtnl_dereference(*mc_hash)) != im)
1340 mc_hash = &aux->next_hash;
1341 *mc_hash = im->next_hash;
1346 * A socket has joined a multicast group on device dev.
1349 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1351 struct ip_mc_list *im;
1352 #ifdef CONFIG_IP_MULTICAST
1353 struct net *net = dev_net(in_dev->dev);
1358 for_each_pmc_rtnl(in_dev, im) {
1359 if (im->multiaddr == addr) {
1361 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1366 im = kzalloc(sizeof(*im), GFP_KERNEL);
1371 im->interface = in_dev;
1372 in_dev_hold(in_dev);
1373 im->multiaddr = addr;
1374 /* initial mode is (EX, empty) */
1375 im->sfmode = MCAST_EXCLUDE;
1376 im->sfcount[MCAST_EXCLUDE] = 1;
1377 atomic_set(&im->refcnt, 1);
1378 spin_lock_init(&im->lock);
1379 #ifdef CONFIG_IP_MULTICAST
1380 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1381 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1384 im->next_rcu = in_dev->mc_list;
1386 rcu_assign_pointer(in_dev->mc_list, im);
1388 ip_mc_hash_add(in_dev, im);
1390 #ifdef CONFIG_IP_MULTICAST
1391 igmpv3_del_delrec(in_dev, im);
1393 igmp_group_added(im);
1395 ip_rt_multicast_event(in_dev);
1399 EXPORT_SYMBOL(ip_mc_inc_group);
1401 static int ip_mc_check_iphdr(struct sk_buff *skb)
1403 const struct iphdr *iph;
1405 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1407 if (!pskb_may_pull(skb, offset))
1412 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1415 offset += ip_hdrlen(skb) - sizeof(*iph);
1417 if (!pskb_may_pull(skb, offset))
1422 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1425 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1426 if (skb->len < len || len < offset)
1429 skb_set_transport_header(skb, offset);
1434 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1436 unsigned int len = skb_transport_offset(skb);
1438 len += sizeof(struct igmpv3_report);
1440 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1443 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1445 unsigned int len = skb_transport_offset(skb);
1447 len += sizeof(struct igmphdr);
1452 if (skb->len != len) {
1454 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1455 if (skb->len < len || !pskb_may_pull(skb, len))
1459 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1460 * all-systems destination addresses (224.0.0.1) for general queries
1462 if (!igmp_hdr(skb)->group &&
1463 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1469 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1471 switch (igmp_hdr(skb)->type) {
1472 case IGMP_HOST_LEAVE_MESSAGE:
1473 case IGMP_HOST_MEMBERSHIP_REPORT:
1474 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1477 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1478 return ip_mc_check_igmp_reportv3(skb);
1479 case IGMP_HOST_MEMBERSHIP_QUERY:
1480 return ip_mc_check_igmp_query(skb);
1486 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1488 return skb_checksum_simple_validate(skb);
1491 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1494 struct sk_buff *skb_chk;
1495 unsigned int transport_len;
1496 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1499 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1501 skb_chk = skb_checksum_trimmed(skb, transport_len,
1502 ip_mc_validate_checksum);
1506 if (!pskb_may_pull(skb_chk, len))
1509 ret = ip_mc_check_igmp_msg(skb_chk);
1514 *skb_trimmed = skb_chk;
1515 /* free now unneeded clone */
1516 else if (skb_chk != skb)
1522 if (ret && skb_chk && skb_chk != skb)
1529 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1530 * @skb: the skb to validate
1531 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1533 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1534 * skb transport header accordingly and returns zero.
1536 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1538 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1539 * -ENOMEM: A memory allocation failure happened.
1541 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1542 * to NULL): After parsing an IGMP packet successfully it will point to
1543 * an skb which has its tail aligned to the IP packet end. This might
1544 * either be the originally provided skb or a trimmed, cloned version if
1545 * the skb frame had data beyond the IP packet. A cloned skb allows us
1546 * to leave the original skb and its full frame unchanged (which might be
1547 * desirable for layer 2 frame jugglers).
1549 * Caller needs to set the skb network header and free any returned skb if it
1550 * differs from the provided skb.
1552 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1554 int ret = ip_mc_check_iphdr(skb);
1559 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1562 return __ip_mc_check_igmp(skb, skb_trimmed);
1564 EXPORT_SYMBOL(ip_mc_check_igmp);
1567 * Resend IGMP JOIN report; used by netdev notifier.
1569 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1571 #ifdef CONFIG_IP_MULTICAST
1572 struct ip_mc_list *im;
1574 struct net *net = dev_net(in_dev->dev);
1578 for_each_pmc_rtnl(in_dev, im) {
1579 if (im->multiaddr == IGMP_ALL_HOSTS)
1581 if (ipv4_is_local_multicast(im->multiaddr) &&
1582 !net->ipv4.sysctl_igmp_llm_reports)
1585 /* a failover is happening and switches
1586 * must be notified immediately
1588 if (IGMP_V1_SEEN(in_dev))
1589 type = IGMP_HOST_MEMBERSHIP_REPORT;
1590 else if (IGMP_V2_SEEN(in_dev))
1591 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1593 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1594 igmp_send_report(in_dev, im, type);
1600 * A socket has left a multicast group on device dev
1603 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1605 struct ip_mc_list *i;
1606 struct ip_mc_list __rcu **ip;
1610 for (ip = &in_dev->mc_list;
1611 (i = rtnl_dereference(*ip)) != NULL;
1612 ip = &i->next_rcu) {
1613 if (i->multiaddr == addr) {
1614 if (--i->users == 0) {
1615 ip_mc_hash_remove(in_dev, i);
1618 igmp_group_dropped(i);
1622 ip_rt_multicast_event(in_dev);
1631 EXPORT_SYMBOL(ip_mc_dec_group);
1633 /* Device changing type */
1635 void ip_mc_unmap(struct in_device *in_dev)
1637 struct ip_mc_list *pmc;
1641 for_each_pmc_rtnl(in_dev, pmc)
1642 igmp_group_dropped(pmc);
1645 void ip_mc_remap(struct in_device *in_dev)
1647 struct ip_mc_list *pmc;
1651 for_each_pmc_rtnl(in_dev, pmc) {
1652 #ifdef CONFIG_IP_MULTICAST
1653 igmpv3_del_delrec(in_dev, pmc);
1655 igmp_group_added(pmc);
1659 /* Device going down */
1661 void ip_mc_down(struct in_device *in_dev)
1663 struct ip_mc_list *pmc;
1667 for_each_pmc_rtnl(in_dev, pmc)
1668 igmp_group_dropped(pmc);
1670 #ifdef CONFIG_IP_MULTICAST
1671 in_dev->mr_ifc_count = 0;
1672 if (del_timer(&in_dev->mr_ifc_timer))
1673 __in_dev_put(in_dev);
1674 in_dev->mr_gq_running = 0;
1675 if (del_timer(&in_dev->mr_gq_timer))
1676 __in_dev_put(in_dev);
1679 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1682 void ip_mc_init_dev(struct in_device *in_dev)
1684 #ifdef CONFIG_IP_MULTICAST
1685 struct net *net = dev_net(in_dev->dev);
1689 #ifdef CONFIG_IP_MULTICAST
1690 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1691 (unsigned long)in_dev);
1692 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1693 (unsigned long)in_dev);
1694 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1697 spin_lock_init(&in_dev->mc_tomb_lock);
1700 /* Device going up */
1702 void ip_mc_up(struct in_device *in_dev)
1704 struct ip_mc_list *pmc;
1705 #ifdef CONFIG_IP_MULTICAST
1706 struct net *net = dev_net(in_dev->dev);
1711 #ifdef CONFIG_IP_MULTICAST
1712 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1714 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1716 for_each_pmc_rtnl(in_dev, pmc) {
1717 #ifdef CONFIG_IP_MULTICAST
1718 igmpv3_del_delrec(in_dev, pmc);
1720 igmp_group_added(pmc);
1725 * Device is about to be destroyed: clean up.
1728 void ip_mc_destroy_dev(struct in_device *in_dev)
1730 struct ip_mc_list *i;
1734 /* Deactivate timers */
1736 #ifdef CONFIG_IP_MULTICAST
1737 igmpv3_clear_delrec(in_dev);
1740 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1741 in_dev->mc_list = i->next_rcu;
1747 /* RTNL is locked */
1748 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1750 struct net_device *dev = NULL;
1751 struct in_device *idev = NULL;
1753 if (imr->imr_ifindex) {
1754 idev = inetdev_by_index(net, imr->imr_ifindex);
1757 if (imr->imr_address.s_addr) {
1758 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1764 struct rtable *rt = ip_route_output(net,
1765 imr->imr_multiaddr.s_addr,
1773 imr->imr_ifindex = dev->ifindex;
1774 idev = __in_dev_get_rtnl(dev);
1780 * Join a socket to a group
1783 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1786 struct ip_sf_list *psf, *psf_prev;
1790 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1791 if (psf->sf_inaddr == *psfsrc)
1795 if (!psf || psf->sf_count[sfmode] == 0) {
1796 /* source filter not found, or count wrong => bug */
1799 psf->sf_count[sfmode]--;
1800 if (psf->sf_count[sfmode] == 0) {
1801 ip_rt_multicast_event(pmc->interface);
1803 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1804 #ifdef CONFIG_IP_MULTICAST
1805 struct in_device *in_dev = pmc->interface;
1806 struct net *net = dev_net(in_dev->dev);
1809 /* no more filters for this source */
1811 psf_prev->sf_next = psf->sf_next;
1813 pmc->sources = psf->sf_next;
1814 #ifdef CONFIG_IP_MULTICAST
1815 if (psf->sf_oldin &&
1816 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1817 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1818 psf->sf_next = pmc->tomb;
1828 #ifndef CONFIG_IP_MULTICAST
1829 #define igmp_ifc_event(x) do { } while (0)
1832 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1833 int sfcount, __be32 *psfsrc, int delta)
1835 struct ip_mc_list *pmc;
1842 for_each_pmc_rcu(in_dev, pmc) {
1843 if (*pmca == pmc->multiaddr)
1847 /* MCA not found?? bug */
1851 spin_lock_bh(&pmc->lock);
1853 #ifdef CONFIG_IP_MULTICAST
1858 if (!pmc->sfcount[sfmode])
1860 pmc->sfcount[sfmode]--;
1863 for (i = 0; i < sfcount; i++) {
1864 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1866 changerec |= rv > 0;
1870 if (pmc->sfmode == MCAST_EXCLUDE &&
1871 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1872 pmc->sfcount[MCAST_INCLUDE]) {
1873 #ifdef CONFIG_IP_MULTICAST
1874 struct ip_sf_list *psf;
1875 struct net *net = dev_net(in_dev->dev);
1878 /* filter mode change */
1879 pmc->sfmode = MCAST_INCLUDE;
1880 #ifdef CONFIG_IP_MULTICAST
1881 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1882 in_dev->mr_ifc_count = pmc->crcount;
1883 for (psf = pmc->sources; psf; psf = psf->sf_next)
1884 psf->sf_crcount = 0;
1885 igmp_ifc_event(pmc->interface);
1886 } else if (sf_setstate(pmc) || changerec) {
1887 igmp_ifc_event(pmc->interface);
1891 spin_unlock_bh(&pmc->lock);
1896 * Add multicast single-source filter to the interface list
1898 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1901 struct ip_sf_list *psf, *psf_prev;
1904 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1905 if (psf->sf_inaddr == *psfsrc)
1910 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1913 psf->sf_inaddr = *psfsrc;
1915 psf_prev->sf_next = psf;
1919 psf->sf_count[sfmode]++;
1920 if (psf->sf_count[sfmode] == 1) {
1921 ip_rt_multicast_event(pmc->interface);
1926 #ifdef CONFIG_IP_MULTICAST
1927 static void sf_markstate(struct ip_mc_list *pmc)
1929 struct ip_sf_list *psf;
1930 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1932 for (psf = pmc->sources; psf; psf = psf->sf_next)
1933 if (pmc->sfcount[MCAST_EXCLUDE]) {
1934 psf->sf_oldin = mca_xcount ==
1935 psf->sf_count[MCAST_EXCLUDE] &&
1936 !psf->sf_count[MCAST_INCLUDE];
1938 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1941 static int sf_setstate(struct ip_mc_list *pmc)
1943 struct ip_sf_list *psf, *dpsf;
1944 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1945 int qrv = pmc->interface->mr_qrv;
1949 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1950 if (pmc->sfcount[MCAST_EXCLUDE]) {
1951 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1952 !psf->sf_count[MCAST_INCLUDE];
1954 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1956 if (!psf->sf_oldin) {
1957 struct ip_sf_list *prev = NULL;
1959 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1960 if (dpsf->sf_inaddr == psf->sf_inaddr)
1966 prev->sf_next = dpsf->sf_next;
1968 pmc->tomb = dpsf->sf_next;
1971 psf->sf_crcount = qrv;
1974 } else if (psf->sf_oldin) {
1976 psf->sf_crcount = 0;
1978 * add or update "delete" records if an active filter
1981 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1982 if (dpsf->sf_inaddr == psf->sf_inaddr)
1985 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1989 /* pmc->lock held by callers */
1990 dpsf->sf_next = pmc->tomb;
1993 dpsf->sf_crcount = qrv;
2002 * Add multicast source filter list to the interface list
2004 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2005 int sfcount, __be32 *psfsrc, int delta)
2007 struct ip_mc_list *pmc;
2014 for_each_pmc_rcu(in_dev, pmc) {
2015 if (*pmca == pmc->multiaddr)
2019 /* MCA not found?? bug */
2023 spin_lock_bh(&pmc->lock);
2026 #ifdef CONFIG_IP_MULTICAST
2029 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2031 pmc->sfcount[sfmode]++;
2033 for (i = 0; i < sfcount; i++) {
2034 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2042 pmc->sfcount[sfmode]--;
2043 for (j = 0; j < i; j++)
2044 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2045 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2046 #ifdef CONFIG_IP_MULTICAST
2047 struct ip_sf_list *psf;
2048 struct net *net = dev_net(pmc->interface->dev);
2049 in_dev = pmc->interface;
2052 /* filter mode change */
2053 if (pmc->sfcount[MCAST_EXCLUDE])
2054 pmc->sfmode = MCAST_EXCLUDE;
2055 else if (pmc->sfcount[MCAST_INCLUDE])
2056 pmc->sfmode = MCAST_INCLUDE;
2057 #ifdef CONFIG_IP_MULTICAST
2058 /* else no filters; keep old mode for reports */
2060 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2061 in_dev->mr_ifc_count = pmc->crcount;
2062 for (psf = pmc->sources; psf; psf = psf->sf_next)
2063 psf->sf_crcount = 0;
2064 igmp_ifc_event(in_dev);
2065 } else if (sf_setstate(pmc)) {
2066 igmp_ifc_event(in_dev);
2069 spin_unlock_bh(&pmc->lock);
2073 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2075 struct ip_sf_list *psf, *nextpsf, *tomb, *sources;
2077 spin_lock_bh(&pmc->lock);
2080 sources = pmc->sources;
2081 pmc->sources = NULL;
2082 pmc->sfmode = MCAST_EXCLUDE;
2083 pmc->sfcount[MCAST_INCLUDE] = 0;
2084 pmc->sfcount[MCAST_EXCLUDE] = 1;
2085 spin_unlock_bh(&pmc->lock);
2087 for (psf = tomb; psf; psf = nextpsf) {
2088 nextpsf = psf->sf_next;
2091 for (psf = sources; psf; psf = nextpsf) {
2092 nextpsf = psf->sf_next;
2097 /* Join a multicast group
2100 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2102 __be32 addr = imr->imr_multiaddr.s_addr;
2103 struct ip_mc_socklist *iml, *i;
2104 struct in_device *in_dev;
2105 struct inet_sock *inet = inet_sk(sk);
2106 struct net *net = sock_net(sk);
2113 if (!ipv4_is_multicast(addr))
2116 in_dev = ip_mc_find_dev(net, imr);
2124 ifindex = imr->imr_ifindex;
2125 for_each_pmc_rtnl(inet, i) {
2126 if (i->multi.imr_multiaddr.s_addr == addr &&
2127 i->multi.imr_ifindex == ifindex)
2132 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2134 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2138 memcpy(&iml->multi, imr, sizeof(*imr));
2139 iml->next_rcu = inet->mc_list;
2141 iml->sfmode = MCAST_EXCLUDE;
2142 rcu_assign_pointer(inet->mc_list, iml);
2143 ip_mc_inc_group(in_dev, addr);
2148 EXPORT_SYMBOL(ip_mc_join_group);
2150 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2151 struct in_device *in_dev)
2153 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2157 /* any-source empty exclude case */
2158 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2159 iml->sfmode, 0, NULL, 0);
2161 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2162 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2163 RCU_INIT_POINTER(iml->sflist, NULL);
2164 /* decrease mem now to avoid the memleak warning */
2165 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2166 kfree_rcu(psf, rcu);
2170 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2172 struct inet_sock *inet = inet_sk(sk);
2173 struct ip_mc_socklist *iml;
2174 struct ip_mc_socklist __rcu **imlp;
2175 struct in_device *in_dev;
2176 struct net *net = sock_net(sk);
2177 __be32 group = imr->imr_multiaddr.s_addr;
2179 int ret = -EADDRNOTAVAIL;
2183 in_dev = ip_mc_find_dev(net, imr);
2184 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2188 ifindex = imr->imr_ifindex;
2189 for (imlp = &inet->mc_list;
2190 (iml = rtnl_dereference(*imlp)) != NULL;
2191 imlp = &iml->next_rcu) {
2192 if (iml->multi.imr_multiaddr.s_addr != group)
2195 if (iml->multi.imr_ifindex != ifindex)
2197 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2198 iml->multi.imr_address.s_addr)
2201 (void) ip_mc_leave_src(sk, iml, in_dev);
2203 *imlp = iml->next_rcu;
2206 ip_mc_dec_group(in_dev, group);
2208 /* decrease mem now to avoid the memleak warning */
2209 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2210 kfree_rcu(iml, rcu);
2216 EXPORT_SYMBOL(ip_mc_leave_group);
2218 int ip_mc_source(int add, int omode, struct sock *sk, struct
2219 ip_mreq_source *mreqs, int ifindex)
2222 struct ip_mreqn imr;
2223 __be32 addr = mreqs->imr_multiaddr;
2224 struct ip_mc_socklist *pmc;
2225 struct in_device *in_dev = NULL;
2226 struct inet_sock *inet = inet_sk(sk);
2227 struct ip_sf_socklist *psl;
2228 struct net *net = sock_net(sk);
2232 if (!ipv4_is_multicast(addr))
2237 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2238 imr.imr_address.s_addr = mreqs->imr_interface;
2239 imr.imr_ifindex = ifindex;
2240 in_dev = ip_mc_find_dev(net, &imr);
2246 err = -EADDRNOTAVAIL;
2248 for_each_pmc_rtnl(inet, pmc) {
2249 if ((pmc->multi.imr_multiaddr.s_addr ==
2250 imr.imr_multiaddr.s_addr) &&
2251 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2254 if (!pmc) { /* must have a prior join */
2258 /* if a source filter was set, must be the same mode as before */
2260 if (pmc->sfmode != omode) {
2264 } else if (pmc->sfmode != omode) {
2265 /* allow mode switches for empty-set filters */
2266 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2267 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2269 pmc->sfmode = omode;
2272 psl = rtnl_dereference(pmc->sflist);
2275 goto done; /* err = -EADDRNOTAVAIL */
2277 for (i = 0; i < psl->sl_count; i++) {
2278 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2283 if (rv) /* source not found */
2284 goto done; /* err = -EADDRNOTAVAIL */
2286 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2287 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2292 /* update the interface filter */
2293 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2294 &mreqs->imr_sourceaddr, 1);
2296 for (j = i+1; j < psl->sl_count; j++)
2297 psl->sl_addr[j-1] = psl->sl_addr[j];
2302 /* else, add a new source to the filter */
2304 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2308 if (!psl || psl->sl_count == psl->sl_max) {
2309 struct ip_sf_socklist *newpsl;
2310 int count = IP_SFBLOCK;
2313 count += psl->sl_max;
2314 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2319 newpsl->sl_max = count;
2320 newpsl->sl_count = count - IP_SFBLOCK;
2322 for (i = 0; i < psl->sl_count; i++)
2323 newpsl->sl_addr[i] = psl->sl_addr[i];
2324 /* decrease mem now to avoid the memleak warning */
2325 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2326 kfree_rcu(psl, rcu);
2328 rcu_assign_pointer(pmc->sflist, newpsl);
2331 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2332 for (i = 0; i < psl->sl_count; i++) {
2333 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2338 if (rv == 0) /* address already there is an error */
2340 for (j = psl->sl_count-1; j >= i; j--)
2341 psl->sl_addr[j+1] = psl->sl_addr[j];
2342 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2345 /* update the interface list */
2346 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2347 &mreqs->imr_sourceaddr, 1);
2350 err = ip_mc_leave_group(sk, &imr);
2354 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2357 struct ip_mreqn imr;
2358 __be32 addr = msf->imsf_multiaddr;
2359 struct ip_mc_socklist *pmc;
2360 struct in_device *in_dev;
2361 struct inet_sock *inet = inet_sk(sk);
2362 struct ip_sf_socklist *newpsl, *psl;
2363 struct net *net = sock_net(sk);
2366 if (!ipv4_is_multicast(addr))
2368 if (msf->imsf_fmode != MCAST_INCLUDE &&
2369 msf->imsf_fmode != MCAST_EXCLUDE)
2374 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2375 imr.imr_address.s_addr = msf->imsf_interface;
2376 imr.imr_ifindex = ifindex;
2377 in_dev = ip_mc_find_dev(net, &imr);
2384 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2385 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2390 for_each_pmc_rtnl(inet, pmc) {
2391 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2392 pmc->multi.imr_ifindex == imr.imr_ifindex)
2395 if (!pmc) { /* must have a prior join */
2399 if (msf->imsf_numsrc) {
2400 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2406 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2407 memcpy(newpsl->sl_addr, msf->imsf_slist,
2408 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2409 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2410 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2412 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2417 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2418 msf->imsf_fmode, 0, NULL, 0);
2420 psl = rtnl_dereference(pmc->sflist);
2422 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2423 psl->sl_count, psl->sl_addr, 0);
2424 /* decrease mem now to avoid the memleak warning */
2425 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2426 kfree_rcu(psl, rcu);
2428 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2430 rcu_assign_pointer(pmc->sflist, newpsl);
2431 pmc->sfmode = msf->imsf_fmode;
2435 err = ip_mc_leave_group(sk, &imr);
2439 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2440 struct ip_msfilter __user *optval, int __user *optlen)
2442 int err, len, count, copycount;
2443 struct ip_mreqn imr;
2444 __be32 addr = msf->imsf_multiaddr;
2445 struct ip_mc_socklist *pmc;
2446 struct in_device *in_dev;
2447 struct inet_sock *inet = inet_sk(sk);
2448 struct ip_sf_socklist *psl;
2449 struct net *net = sock_net(sk);
2453 if (!ipv4_is_multicast(addr))
2456 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2457 imr.imr_address.s_addr = msf->imsf_interface;
2458 imr.imr_ifindex = 0;
2459 in_dev = ip_mc_find_dev(net, &imr);
2465 err = -EADDRNOTAVAIL;
2467 for_each_pmc_rtnl(inet, pmc) {
2468 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2469 pmc->multi.imr_ifindex == imr.imr_ifindex)
2472 if (!pmc) /* must have a prior join */
2474 msf->imsf_fmode = pmc->sfmode;
2475 psl = rtnl_dereference(pmc->sflist);
2480 count = psl->sl_count;
2482 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2483 len = copycount * sizeof(psl->sl_addr[0]);
2484 msf->imsf_numsrc = count;
2485 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2486 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2490 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2497 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2498 struct group_filter __user *optval, int __user *optlen)
2500 int err, i, count, copycount;
2501 struct sockaddr_in *psin;
2503 struct ip_mc_socklist *pmc;
2504 struct inet_sock *inet = inet_sk(sk);
2505 struct ip_sf_socklist *psl;
2509 psin = (struct sockaddr_in *)&gsf->gf_group;
2510 if (psin->sin_family != AF_INET)
2512 addr = psin->sin_addr.s_addr;
2513 if (!ipv4_is_multicast(addr))
2516 err = -EADDRNOTAVAIL;
2518 for_each_pmc_rtnl(inet, pmc) {
2519 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2520 pmc->multi.imr_ifindex == gsf->gf_interface)
2523 if (!pmc) /* must have a prior join */
2525 gsf->gf_fmode = pmc->sfmode;
2526 psl = rtnl_dereference(pmc->sflist);
2527 count = psl ? psl->sl_count : 0;
2528 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2529 gsf->gf_numsrc = count;
2530 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2531 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2534 for (i = 0; i < copycount; i++) {
2535 struct sockaddr_storage ss;
2537 psin = (struct sockaddr_in *)&ss;
2538 memset(&ss, 0, sizeof(ss));
2539 psin->sin_family = AF_INET;
2540 psin->sin_addr.s_addr = psl->sl_addr[i];
2541 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2550 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2552 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2554 struct inet_sock *inet = inet_sk(sk);
2555 struct ip_mc_socklist *pmc;
2556 struct ip_sf_socklist *psl;
2561 if (!ipv4_is_multicast(loc_addr))
2565 for_each_pmc_rcu(inet, pmc) {
2566 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2567 pmc->multi.imr_ifindex == dif)
2573 psl = rcu_dereference(pmc->sflist);
2574 ret = (pmc->sfmode == MCAST_EXCLUDE);
2578 for (i = 0; i < psl->sl_count; i++) {
2579 if (psl->sl_addr[i] == rmt_addr)
2583 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2585 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2595 * A socket is closing.
2598 void ip_mc_drop_socket(struct sock *sk)
2600 struct inet_sock *inet = inet_sk(sk);
2601 struct ip_mc_socklist *iml;
2602 struct net *net = sock_net(sk);
2608 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2609 struct in_device *in_dev;
2611 inet->mc_list = iml->next_rcu;
2612 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2613 (void) ip_mc_leave_src(sk, iml, in_dev);
2615 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2616 /* decrease mem now to avoid the memleak warning */
2617 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2618 kfree_rcu(iml, rcu);
2623 /* called with rcu_read_lock() */
2624 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2626 struct ip_mc_list *im;
2627 struct ip_mc_list __rcu **mc_hash;
2628 struct ip_sf_list *psf;
2631 mc_hash = rcu_dereference(in_dev->mc_hash);
2633 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2635 for (im = rcu_dereference(mc_hash[hash]);
2637 im = rcu_dereference(im->next_hash)) {
2638 if (im->multiaddr == mc_addr)
2642 for_each_pmc_rcu(in_dev, im) {
2643 if (im->multiaddr == mc_addr)
2647 if (im && proto == IPPROTO_IGMP) {
2651 for (psf = im->sources; psf; psf = psf->sf_next) {
2652 if (psf->sf_inaddr == src_addr)
2656 rv = psf->sf_count[MCAST_INCLUDE] ||
2657 psf->sf_count[MCAST_EXCLUDE] !=
2658 im->sfcount[MCAST_EXCLUDE];
2660 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2662 rv = 1; /* unspecified source; tentatively allow */
2667 #if defined(CONFIG_PROC_FS)
2668 struct igmp_mc_iter_state {
2669 struct seq_net_private p;
2670 struct net_device *dev;
2671 struct in_device *in_dev;
2674 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2676 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2678 struct net *net = seq_file_net(seq);
2679 struct ip_mc_list *im = NULL;
2680 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2682 state->in_dev = NULL;
2683 for_each_netdev_rcu(net, state->dev) {
2684 struct in_device *in_dev;
2686 in_dev = __in_dev_get_rcu(state->dev);
2689 im = rcu_dereference(in_dev->mc_list);
2691 state->in_dev = in_dev;
2698 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2700 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2702 im = rcu_dereference(im->next_rcu);
2704 state->dev = next_net_device_rcu(state->dev);
2706 state->in_dev = NULL;
2709 state->in_dev = __in_dev_get_rcu(state->dev);
2712 im = rcu_dereference(state->in_dev->mc_list);
2717 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2719 struct ip_mc_list *im = igmp_mc_get_first(seq);
2721 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2723 return pos ? NULL : im;
2726 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2730 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2733 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2735 struct ip_mc_list *im;
2736 if (v == SEQ_START_TOKEN)
2737 im = igmp_mc_get_first(seq);
2739 im = igmp_mc_get_next(seq, v);
2744 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2747 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2749 state->in_dev = NULL;
2754 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2756 if (v == SEQ_START_TOKEN)
2758 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2760 struct ip_mc_list *im = (struct ip_mc_list *)v;
2761 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2765 #ifdef CONFIG_IP_MULTICAST
2766 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2767 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2773 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2774 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2775 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2778 delta = im->timer.expires - jiffies;
2780 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2781 im->multiaddr, im->users,
2783 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2789 static const struct seq_operations igmp_mc_seq_ops = {
2790 .start = igmp_mc_seq_start,
2791 .next = igmp_mc_seq_next,
2792 .stop = igmp_mc_seq_stop,
2793 .show = igmp_mc_seq_show,
2796 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2798 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2799 sizeof(struct igmp_mc_iter_state));
2802 static const struct file_operations igmp_mc_seq_fops = {
2803 .owner = THIS_MODULE,
2804 .open = igmp_mc_seq_open,
2806 .llseek = seq_lseek,
2807 .release = seq_release_net,
2810 struct igmp_mcf_iter_state {
2811 struct seq_net_private p;
2812 struct net_device *dev;
2813 struct in_device *idev;
2814 struct ip_mc_list *im;
2817 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2819 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2821 struct net *net = seq_file_net(seq);
2822 struct ip_sf_list *psf = NULL;
2823 struct ip_mc_list *im = NULL;
2824 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2828 for_each_netdev_rcu(net, state->dev) {
2829 struct in_device *idev;
2830 idev = __in_dev_get_rcu(state->dev);
2831 if (unlikely(!idev))
2833 im = rcu_dereference(idev->mc_list);
2835 spin_lock_bh(&im->lock);
2842 spin_unlock_bh(&im->lock);
2848 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2850 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2854 spin_unlock_bh(&state->im->lock);
2855 state->im = state->im->next;
2856 while (!state->im) {
2857 state->dev = next_net_device_rcu(state->dev);
2862 state->idev = __in_dev_get_rcu(state->dev);
2865 state->im = rcu_dereference(state->idev->mc_list);
2869 spin_lock_bh(&state->im->lock);
2870 psf = state->im->sources;
2876 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2878 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2880 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2882 return pos ? NULL : psf;
2885 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2889 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2892 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2894 struct ip_sf_list *psf;
2895 if (v == SEQ_START_TOKEN)
2896 psf = igmp_mcf_get_first(seq);
2898 psf = igmp_mcf_get_next(seq, v);
2903 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2906 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2907 if (likely(state->im)) {
2908 spin_unlock_bh(&state->im->lock);
2916 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2918 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2919 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2921 if (v == SEQ_START_TOKEN) {
2922 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2926 "0x%08x %6lu %6lu\n",
2927 state->dev->ifindex, state->dev->name,
2928 ntohl(state->im->multiaddr),
2929 ntohl(psf->sf_inaddr),
2930 psf->sf_count[MCAST_INCLUDE],
2931 psf->sf_count[MCAST_EXCLUDE]);
2936 static const struct seq_operations igmp_mcf_seq_ops = {
2937 .start = igmp_mcf_seq_start,
2938 .next = igmp_mcf_seq_next,
2939 .stop = igmp_mcf_seq_stop,
2940 .show = igmp_mcf_seq_show,
2943 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2945 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2946 sizeof(struct igmp_mcf_iter_state));
2949 static const struct file_operations igmp_mcf_seq_fops = {
2950 .owner = THIS_MODULE,
2951 .open = igmp_mcf_seq_open,
2953 .llseek = seq_lseek,
2954 .release = seq_release_net,
2957 static int __net_init igmp_net_init(struct net *net)
2959 struct proc_dir_entry *pde;
2962 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2965 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2966 &igmp_mcf_seq_fops);
2969 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2970 SOCK_DGRAM, 0, net);
2972 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2977 /* Sysctl initialization */
2978 net->ipv4.sysctl_igmp_max_memberships = 20;
2979 net->ipv4.sysctl_igmp_max_msf = 10;
2980 /* IGMP reports for link-local multicast groups are enabled by default */
2981 net->ipv4.sysctl_igmp_llm_reports = 1;
2982 net->ipv4.sysctl_igmp_qrv = 2;
2986 remove_proc_entry("mcfilter", net->proc_net);
2988 remove_proc_entry("igmp", net->proc_net);
2993 static void __net_exit igmp_net_exit(struct net *net)
2995 remove_proc_entry("mcfilter", net->proc_net);
2996 remove_proc_entry("igmp", net->proc_net);
2997 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3000 static struct pernet_operations igmp_net_ops = {
3001 .init = igmp_net_init,
3002 .exit = igmp_net_exit,
3006 static int igmp_netdev_event(struct notifier_block *this,
3007 unsigned long event, void *ptr)
3009 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3010 struct in_device *in_dev;
3013 case NETDEV_RESEND_IGMP:
3014 in_dev = __in_dev_get_rtnl(dev);
3016 ip_mc_rejoin_groups(in_dev);
3024 static struct notifier_block igmp_notifier = {
3025 .notifier_call = igmp_netdev_event,
3028 int __init igmp_mc_init(void)
3030 #if defined(CONFIG_PROC_FS)
3033 err = register_pernet_subsys(&igmp_net_ops);
3036 err = register_netdevice_notifier(&igmp_notifier);
3038 goto reg_notif_fail;
3042 unregister_pernet_subsys(&igmp_net_ops);
3045 return register_netdevice_notifier(&igmp_notifier);