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 <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>
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, __be32 multiaddr);
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;
223 in_dev->mr_gq_running = 1;
224 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
228 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
230 int tv = prandom_u32() % delay;
232 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
236 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
238 spin_lock_bh(&im->lock);
239 im->unsolicit_count = 0;
240 if (del_timer(&im->timer)) {
241 if ((long)(im->timer.expires-jiffies) < max_delay) {
242 add_timer(&im->timer);
244 spin_unlock_bh(&im->lock);
247 atomic_dec(&im->refcnt);
249 igmp_start_timer(im, max_delay);
250 spin_unlock_bh(&im->lock);
255 * Send an IGMP report.
258 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
261 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
262 int gdeleted, int sdeleted)
265 case IGMPV3_MODE_IS_INCLUDE:
266 case IGMPV3_MODE_IS_EXCLUDE:
267 if (gdeleted || sdeleted)
269 if (!(pmc->gsquery && !psf->sf_gsresp)) {
270 if (pmc->sfmode == MCAST_INCLUDE)
272 /* don't include if this source is excluded
275 if (psf->sf_count[MCAST_INCLUDE])
276 return type == IGMPV3_MODE_IS_INCLUDE;
277 return pmc->sfcount[MCAST_EXCLUDE] ==
278 psf->sf_count[MCAST_EXCLUDE];
281 case IGMPV3_CHANGE_TO_INCLUDE:
282 if (gdeleted || sdeleted)
284 return psf->sf_count[MCAST_INCLUDE] != 0;
285 case IGMPV3_CHANGE_TO_EXCLUDE:
286 if (gdeleted || sdeleted)
288 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
289 psf->sf_count[MCAST_INCLUDE])
291 return pmc->sfcount[MCAST_EXCLUDE] ==
292 psf->sf_count[MCAST_EXCLUDE];
293 case IGMPV3_ALLOW_NEW_SOURCES:
294 if (gdeleted || !psf->sf_crcount)
296 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
297 case IGMPV3_BLOCK_OLD_SOURCES:
298 if (pmc->sfmode == MCAST_INCLUDE)
299 return gdeleted || (psf->sf_crcount && sdeleted);
300 return psf->sf_crcount && !gdeleted && !sdeleted;
306 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
308 struct ip_sf_list *psf;
311 for (psf = pmc->sources; psf; psf = psf->sf_next) {
312 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
319 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
324 struct igmpv3_report *pig;
325 struct net *net = dev_net(dev);
327 int hlen = LL_RESERVED_SPACE(dev);
328 int tlen = dev->needed_tailroom;
329 unsigned int size = mtu;
332 skb = alloc_skb(size + hlen + tlen,
333 GFP_ATOMIC | __GFP_NOWARN);
340 skb->priority = TC_PRIO_CONTROL;
342 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
344 IPPROTO_IGMP, 0, dev->ifindex);
350 skb_dst_set(skb, &rt->dst);
353 skb->reserved_tailroom = skb_end_offset(skb) -
354 min(mtu, skb_end_offset(skb));
355 skb_reserve(skb, hlen);
357 skb_reset_network_header(skb);
359 skb_put(skb, sizeof(struct iphdr) + 4);
362 pip->ihl = (sizeof(struct iphdr)+4)>>2;
364 pip->frag_off = htons(IP_DF);
366 pip->daddr = fl4.daddr;
367 pip->saddr = fl4.saddr;
368 pip->protocol = IPPROTO_IGMP;
369 pip->tot_len = 0; /* filled in later */
370 ip_select_ident(net, skb, NULL);
371 ((u8 *)&pip[1])[0] = IPOPT_RA;
372 ((u8 *)&pip[1])[1] = 4;
373 ((u8 *)&pip[1])[2] = 0;
374 ((u8 *)&pip[1])[3] = 0;
376 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
377 skb_put(skb, sizeof(*pig));
378 pig = igmpv3_report_hdr(skb);
379 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
387 static int igmpv3_sendpack(struct sk_buff *skb)
389 struct igmphdr *pig = igmp_hdr(skb);
390 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
392 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
394 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
397 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
399 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
402 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
403 int type, struct igmpv3_grec **ppgr)
405 struct net_device *dev = pmc->interface->dev;
406 struct igmpv3_report *pih;
407 struct igmpv3_grec *pgr;
410 skb = igmpv3_newpack(dev, dev->mtu);
413 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
414 pgr->grec_type = type;
415 pgr->grec_auxwords = 0;
417 pgr->grec_mca = pmc->multiaddr;
418 pih = igmpv3_report_hdr(skb);
419 pih->ngrec = htons(ntohs(pih->ngrec)+1);
424 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
426 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
427 int type, int gdeleted, int sdeleted)
429 struct net_device *dev = pmc->interface->dev;
430 struct net *net = dev_net(dev);
431 struct igmpv3_report *pih;
432 struct igmpv3_grec *pgr = NULL;
433 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
434 int scount, stotal, first, isquery, truncate;
436 if (pmc->multiaddr == IGMP_ALL_HOSTS)
438 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
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;
448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
453 pih = skb ? igmpv3_report_hdr(skb) : NULL;
455 /* EX and TO_EX get a fresh packet, if needed */
457 if (pih && pih->ngrec &&
458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
466 for (psf = *psf_list; psf; psf = psf_next) {
469 psf_next = psf->sf_next;
471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
476 /* clear marks on query responses */
480 if (AVAILABLE(skb) < sizeof(__be32) +
481 first*sizeof(struct igmpv3_grec)) {
482 if (truncate && !first)
483 break; /* truncate these */
485 pgr->grec_nsrcs = htons(scount);
487 igmpv3_sendpack(skb);
488 skb = igmpv3_newpack(dev, dev->mtu);
493 skb = add_grhead(skb, pmc, type, &pgr);
498 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
499 *psrc = psf->sf_inaddr;
501 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
506 psf_prev->sf_next = psf->sf_next;
508 *psf_list = psf->sf_next;
518 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
519 type == IGMPV3_BLOCK_OLD_SOURCES)
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 */
527 skb = add_grhead(skb, pmc, type, &pgr);
531 pgr->grec_nsrcs = htons(scount);
534 pmc->gsquery = 0; /* clear query state on report */
538 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
540 struct sk_buff *skb = NULL;
541 struct net *net = dev_net(in_dev->dev);
546 for_each_pmc_rcu(in_dev, pmc) {
547 if (pmc->multiaddr == IGMP_ALL_HOSTS)
549 if (ipv4_is_local_multicast(pmc->multiaddr) &&
550 !net->ipv4.sysctl_igmp_llm_reports)
552 spin_lock_bh(&pmc->lock);
553 if (pmc->sfcount[MCAST_EXCLUDE])
554 type = IGMPV3_MODE_IS_EXCLUDE;
556 type = IGMPV3_MODE_IS_INCLUDE;
557 skb = add_grec(skb, pmc, type, 0, 0);
558 spin_unlock_bh(&pmc->lock);
562 spin_lock_bh(&pmc->lock);
563 if (pmc->sfcount[MCAST_EXCLUDE])
564 type = IGMPV3_MODE_IS_EXCLUDE;
566 type = IGMPV3_MODE_IS_INCLUDE;
567 skb = add_grec(skb, pmc, type, 0, 0);
568 spin_unlock_bh(&pmc->lock);
572 return igmpv3_sendpack(skb);
576 * remove zero-count source records from a source filter list
578 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
580 struct ip_sf_list *psf_prev, *psf_next, *psf;
583 for (psf = *ppsf; psf; psf = psf_next) {
584 psf_next = psf->sf_next;
585 if (psf->sf_crcount == 0) {
587 psf_prev->sf_next = psf->sf_next;
589 *ppsf = psf->sf_next;
596 static void igmpv3_send_cr(struct in_device *in_dev)
598 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
599 struct sk_buff *skb = NULL;
603 spin_lock_bh(&in_dev->mc_tomb_lock);
607 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
608 pmc_next = pmc->next;
609 if (pmc->sfmode == MCAST_INCLUDE) {
610 type = IGMPV3_BLOCK_OLD_SOURCES;
611 dtype = IGMPV3_BLOCK_OLD_SOURCES;
612 skb = add_grec(skb, pmc, type, 1, 0);
613 skb = add_grec(skb, pmc, dtype, 1, 1);
616 if (pmc->sfmode == MCAST_EXCLUDE) {
617 type = IGMPV3_CHANGE_TO_INCLUDE;
618 skb = add_grec(skb, pmc, type, 1, 0);
621 if (pmc->crcount == 0) {
622 igmpv3_clear_zeros(&pmc->tomb);
623 igmpv3_clear_zeros(&pmc->sources);
626 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
628 pmc_prev->next = pmc_next;
630 in_dev->mc_tomb = pmc_next;
631 in_dev_put(pmc->interface);
636 spin_unlock_bh(&in_dev->mc_tomb_lock);
639 for_each_pmc_rcu(in_dev, pmc) {
640 spin_lock_bh(&pmc->lock);
641 if (pmc->sfcount[MCAST_EXCLUDE]) {
642 type = IGMPV3_BLOCK_OLD_SOURCES;
643 dtype = IGMPV3_ALLOW_NEW_SOURCES;
645 type = IGMPV3_ALLOW_NEW_SOURCES;
646 dtype = IGMPV3_BLOCK_OLD_SOURCES;
648 skb = add_grec(skb, pmc, type, 0, 0);
649 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
651 /* filter mode changes */
653 if (pmc->sfmode == MCAST_EXCLUDE)
654 type = IGMPV3_CHANGE_TO_EXCLUDE;
656 type = IGMPV3_CHANGE_TO_INCLUDE;
657 skb = add_grec(skb, pmc, type, 0, 0);
660 spin_unlock_bh(&pmc->lock);
666 (void) igmpv3_sendpack(skb);
669 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
676 struct net_device *dev = in_dev->dev;
677 struct net *net = dev_net(dev);
678 __be32 group = pmc ? pmc->multiaddr : 0;
683 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
684 return igmpv3_send_report(in_dev, pmc);
686 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
689 if (type == IGMP_HOST_LEAVE_MESSAGE)
690 dst = IGMP_ALL_ROUTER;
694 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
696 IPPROTO_IGMP, 0, dev->ifindex);
700 hlen = LL_RESERVED_SPACE(dev);
701 tlen = dev->needed_tailroom;
702 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
707 skb->priority = TC_PRIO_CONTROL;
709 skb_dst_set(skb, &rt->dst);
711 skb_reserve(skb, hlen);
713 skb_reset_network_header(skb);
715 skb_put(skb, sizeof(struct iphdr) + 4);
718 iph->ihl = (sizeof(struct iphdr)+4)>>2;
720 iph->frag_off = htons(IP_DF);
723 iph->saddr = fl4.saddr;
724 iph->protocol = IPPROTO_IGMP;
725 ip_select_ident(net, skb, NULL);
726 ((u8 *)&iph[1])[0] = IPOPT_RA;
727 ((u8 *)&iph[1])[1] = 4;
728 ((u8 *)&iph[1])[2] = 0;
729 ((u8 *)&iph[1])[3] = 0;
731 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
736 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
738 return ip_local_out(net, skb->sk, skb);
741 static void igmp_gq_timer_expire(unsigned long data)
743 struct in_device *in_dev = (struct in_device *)data;
745 in_dev->mr_gq_running = 0;
746 igmpv3_send_report(in_dev, NULL);
750 static void igmp_ifc_timer_expire(unsigned long data)
752 struct in_device *in_dev = (struct in_device *)data;
754 igmpv3_send_cr(in_dev);
755 if (in_dev->mr_ifc_count) {
756 in_dev->mr_ifc_count--;
757 igmp_ifc_start_timer(in_dev,
758 unsolicited_report_interval(in_dev));
763 static void igmp_ifc_event(struct in_device *in_dev)
765 struct net *net = dev_net(in_dev->dev);
766 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
768 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
769 igmp_ifc_start_timer(in_dev, 1);
773 static void igmp_timer_expire(unsigned long data)
775 struct ip_mc_list *im = (struct ip_mc_list *)data;
776 struct in_device *in_dev = im->interface;
778 spin_lock(&im->lock);
781 if (im->unsolicit_count) {
782 im->unsolicit_count--;
783 igmp_start_timer(im, unsolicited_report_interval(in_dev));
786 spin_unlock(&im->lock);
788 if (IGMP_V1_SEEN(in_dev))
789 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
790 else if (IGMP_V2_SEEN(in_dev))
791 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
793 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
798 /* mark EXCLUDE-mode sources */
799 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
801 struct ip_sf_list *psf;
805 for (psf = pmc->sources; psf; psf = psf->sf_next) {
808 for (i = 0; i < nsrcs; i++) {
809 /* skip inactive filters */
810 if (psf->sf_count[MCAST_INCLUDE] ||
811 pmc->sfcount[MCAST_EXCLUDE] !=
812 psf->sf_count[MCAST_EXCLUDE])
814 if (srcs[i] == psf->sf_inaddr) {
821 if (scount == nsrcs) /* all sources excluded */
826 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
828 struct ip_sf_list *psf;
831 if (pmc->sfmode == MCAST_EXCLUDE)
832 return igmp_xmarksources(pmc, nsrcs, srcs);
834 /* mark INCLUDE-mode sources */
836 for (psf = pmc->sources; psf; psf = psf->sf_next) {
839 for (i = 0; i < nsrcs; i++)
840 if (srcs[i] == psf->sf_inaddr) {
854 /* return true if packet was dropped */
855 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
857 struct ip_mc_list *im;
858 struct net *net = dev_net(in_dev->dev);
860 /* Timers are only set for non-local groups */
862 if (group == IGMP_ALL_HOSTS)
864 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
868 for_each_pmc_rcu(in_dev, im) {
869 if (im->multiaddr == group) {
878 /* return true if packet was dropped */
879 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
882 struct igmphdr *ih = igmp_hdr(skb);
883 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
884 struct ip_mc_list *im;
885 __be32 group = ih->group;
888 struct net *net = dev_net(in_dev->dev);
893 /* Alas, old v1 router presents here. */
895 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
896 in_dev->mr_v1_seen = jiffies +
897 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
900 /* v2 router present */
901 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
902 in_dev->mr_v2_seen = jiffies +
903 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
905 /* cancel the interface change timer */
906 in_dev->mr_ifc_count = 0;
907 if (del_timer(&in_dev->mr_ifc_timer))
908 __in_dev_put(in_dev);
909 /* clear deleted report items */
910 igmpv3_clear_delrec(in_dev);
911 } else if (len < 12) {
912 return true; /* ignore bogus packet; freed by caller */
913 } else if (IGMP_V1_SEEN(in_dev)) {
914 /* This is a v3 query with v1 queriers present */
915 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
917 } else if (IGMP_V2_SEEN(in_dev)) {
918 /* this is a v3 query with v2 queriers present;
919 * Interpretation of the max_delay code is problematic here.
920 * A real v2 host would use ih_code directly, while v3 has a
921 * different encoding. We use the v3 encoding as more likely
922 * to be intended in a v3 query.
924 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
926 max_delay = 1; /* can't mod w/ 0 */
928 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
931 ih3 = igmpv3_query_hdr(skb);
933 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
934 + ntohs(ih3->nsrcs)*sizeof(__be32)))
936 ih3 = igmpv3_query_hdr(skb);
939 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
941 max_delay = 1; /* can't mod w/ 0 */
942 in_dev->mr_maxdelay = max_delay;
944 in_dev->mr_qrv = ih3->qrv;
945 if (!group) { /* general query */
947 return true; /* no sources allowed */
948 igmp_gq_start_timer(in_dev);
951 /* mark sources to include, if group & source-specific */
952 mark = ih3->nsrcs != 0;
956 * - Start the timers in all of our membership records
957 * that the query applies to for the interface on
958 * which the query arrived excl. those that belong
959 * to a "local" group (224.0.0.X)
960 * - For timers already running check if they need to
962 * - Use the igmp->igmp_code field as the maximum
966 for_each_pmc_rcu(in_dev, im) {
969 if (group && group != im->multiaddr)
971 if (im->multiaddr == IGMP_ALL_HOSTS)
973 if (ipv4_is_local_multicast(im->multiaddr) &&
974 !net->ipv4.sysctl_igmp_llm_reports)
976 spin_lock_bh(&im->lock);
978 im->gsquery = im->gsquery && mark;
981 changed = !im->gsquery ||
982 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
983 spin_unlock_bh(&im->lock);
985 igmp_mod_timer(im, max_delay);
991 /* called in rcu_read_lock() section */
992 int igmp_rcv(struct sk_buff *skb)
994 /* This basically follows the spec line by line -- see RFC1112 */
996 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1003 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1006 if (skb_checksum_simple_validate(skb))
1011 case IGMP_HOST_MEMBERSHIP_QUERY:
1012 dropped = igmp_heard_query(in_dev, skb, len);
1014 case IGMP_HOST_MEMBERSHIP_REPORT:
1015 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1016 /* Is it our report looped back? */
1017 if (rt_is_output_route(skb_rtable(skb)))
1019 /* don't rely on MC router hearing unicast reports */
1020 if (skb->pkt_type == PACKET_MULTICAST ||
1021 skb->pkt_type == PACKET_BROADCAST)
1022 dropped = igmp_heard_report(in_dev, ih->group);
1025 #ifdef CONFIG_IP_PIMSM_V1
1026 return pim_rcv_v1(skb);
1028 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1031 case IGMP_HOST_LEAVE_MESSAGE:
1033 case IGMP_MTRACE_RESP:
1051 * Add a filter to a device
1054 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1056 char buf[MAX_ADDR_LEN];
1057 struct net_device *dev = in_dev->dev;
1059 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1060 We will get multicast token leakage, when IFF_MULTICAST
1061 is changed. This check should be done in ndo_set_rx_mode
1062 routine. Something sort of:
1063 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1066 if (arp_mc_map(addr, buf, dev, 0) == 0)
1067 dev_mc_add(dev, buf);
1071 * Remove a filter from a device
1074 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1076 char buf[MAX_ADDR_LEN];
1077 struct net_device *dev = in_dev->dev;
1079 if (arp_mc_map(addr, buf, dev, 0) == 0)
1080 dev_mc_del(dev, buf);
1083 #ifdef CONFIG_IP_MULTICAST
1085 * deleted ip_mc_list manipulation
1087 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1089 struct ip_mc_list *pmc;
1090 struct net *net = dev_net(in_dev->dev);
1092 /* this is an "ip_mc_list" for convenience; only the fields below
1093 * are actually used. In particular, the refcnt and users are not
1094 * used for management of the delete list. Using the same structure
1095 * for deleted items allows change reports to use common code with
1096 * non-deleted or query-response MCA's.
1098 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1101 spin_lock_bh(&im->lock);
1102 pmc->interface = im->interface;
1103 in_dev_hold(in_dev);
1104 pmc->multiaddr = im->multiaddr;
1105 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1106 pmc->sfmode = im->sfmode;
1107 if (pmc->sfmode == MCAST_INCLUDE) {
1108 struct ip_sf_list *psf;
1110 pmc->tomb = im->tomb;
1111 pmc->sources = im->sources;
1112 im->tomb = im->sources = NULL;
1113 for (psf = pmc->sources; psf; psf = psf->sf_next)
1114 psf->sf_crcount = pmc->crcount;
1116 spin_unlock_bh(&im->lock);
1118 spin_lock_bh(&in_dev->mc_tomb_lock);
1119 pmc->next = in_dev->mc_tomb;
1120 in_dev->mc_tomb = pmc;
1121 spin_unlock_bh(&in_dev->mc_tomb_lock);
1124 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1126 struct ip_mc_list *pmc, *pmc_prev;
1127 struct ip_sf_list *psf, *psf_next;
1129 spin_lock_bh(&in_dev->mc_tomb_lock);
1131 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1132 if (pmc->multiaddr == multiaddr)
1138 pmc_prev->next = pmc->next;
1140 in_dev->mc_tomb = pmc->next;
1142 spin_unlock_bh(&in_dev->mc_tomb_lock);
1144 for (psf = pmc->tomb; psf; psf = psf_next) {
1145 psf_next = psf->sf_next;
1148 in_dev_put(pmc->interface);
1153 static void igmpv3_clear_delrec(struct in_device *in_dev)
1155 struct ip_mc_list *pmc, *nextpmc;
1157 spin_lock_bh(&in_dev->mc_tomb_lock);
1158 pmc = in_dev->mc_tomb;
1159 in_dev->mc_tomb = NULL;
1160 spin_unlock_bh(&in_dev->mc_tomb_lock);
1162 for (; pmc; pmc = nextpmc) {
1163 nextpmc = pmc->next;
1164 ip_mc_clear_src(pmc);
1165 in_dev_put(pmc->interface);
1168 /* clear dead sources, too */
1170 for_each_pmc_rcu(in_dev, pmc) {
1171 struct ip_sf_list *psf, *psf_next;
1173 spin_lock_bh(&pmc->lock);
1176 spin_unlock_bh(&pmc->lock);
1177 for (; psf; psf = psf_next) {
1178 psf_next = psf->sf_next;
1186 static void igmp_group_dropped(struct ip_mc_list *im)
1188 struct in_device *in_dev = im->interface;
1189 #ifdef CONFIG_IP_MULTICAST
1190 struct net *net = dev_net(in_dev->dev);
1196 ip_mc_filter_del(in_dev, im->multiaddr);
1199 #ifdef CONFIG_IP_MULTICAST
1200 if (im->multiaddr == IGMP_ALL_HOSTS)
1202 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1205 reporter = im->reporter;
1206 igmp_stop_timer(im);
1208 if (!in_dev->dead) {
1209 if (IGMP_V1_SEEN(in_dev))
1211 if (IGMP_V2_SEEN(in_dev)) {
1213 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1217 igmpv3_add_delrec(in_dev, im);
1219 igmp_ifc_event(in_dev);
1224 static void igmp_group_added(struct ip_mc_list *im)
1226 struct in_device *in_dev = im->interface;
1227 struct net *net = dev_net(in_dev->dev);
1229 if (im->loaded == 0) {
1231 ip_mc_filter_add(in_dev, im->multiaddr);
1234 #ifdef CONFIG_IP_MULTICAST
1235 if (im->multiaddr == IGMP_ALL_HOSTS)
1237 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1242 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1243 spin_lock_bh(&im->lock);
1244 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1245 spin_unlock_bh(&im->lock);
1250 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1251 igmp_ifc_event(in_dev);
1257 * Multicast list managers
1260 static u32 ip_mc_hash(const struct ip_mc_list *im)
1262 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1265 static void ip_mc_hash_add(struct in_device *in_dev,
1266 struct ip_mc_list *im)
1268 struct ip_mc_list __rcu **mc_hash;
1271 mc_hash = rtnl_dereference(in_dev->mc_hash);
1273 hash = ip_mc_hash(im);
1274 im->next_hash = mc_hash[hash];
1275 rcu_assign_pointer(mc_hash[hash], im);
1279 /* do not use a hash table for small number of items */
1280 if (in_dev->mc_count < 4)
1283 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1288 for_each_pmc_rtnl(in_dev, im) {
1289 hash = ip_mc_hash(im);
1290 im->next_hash = mc_hash[hash];
1291 RCU_INIT_POINTER(mc_hash[hash], im);
1294 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1297 static void ip_mc_hash_remove(struct in_device *in_dev,
1298 struct ip_mc_list *im)
1300 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1301 struct ip_mc_list *aux;
1305 mc_hash += ip_mc_hash(im);
1306 while ((aux = rtnl_dereference(*mc_hash)) != im)
1307 mc_hash = &aux->next_hash;
1308 *mc_hash = im->next_hash;
1313 * A socket has joined a multicast group on device dev.
1316 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1318 struct ip_mc_list *im;
1319 struct net *net = dev_net(in_dev->dev);
1323 for_each_pmc_rtnl(in_dev, im) {
1324 if (im->multiaddr == addr) {
1326 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1331 im = kzalloc(sizeof(*im), GFP_KERNEL);
1336 im->interface = in_dev;
1337 in_dev_hold(in_dev);
1338 im->multiaddr = addr;
1339 /* initial mode is (EX, empty) */
1340 im->sfmode = MCAST_EXCLUDE;
1341 im->sfcount[MCAST_EXCLUDE] = 1;
1342 atomic_set(&im->refcnt, 1);
1343 spin_lock_init(&im->lock);
1344 #ifdef CONFIG_IP_MULTICAST
1345 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1346 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1349 im->next_rcu = in_dev->mc_list;
1351 rcu_assign_pointer(in_dev->mc_list, im);
1353 ip_mc_hash_add(in_dev, im);
1355 #ifdef CONFIG_IP_MULTICAST
1356 igmpv3_del_delrec(in_dev, im->multiaddr);
1358 igmp_group_added(im);
1360 ip_rt_multicast_event(in_dev);
1364 EXPORT_SYMBOL(ip_mc_inc_group);
1366 static int ip_mc_check_iphdr(struct sk_buff *skb)
1368 const struct iphdr *iph;
1370 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1372 if (!pskb_may_pull(skb, offset))
1377 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1380 offset += ip_hdrlen(skb) - sizeof(*iph);
1382 if (!pskb_may_pull(skb, offset))
1387 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1390 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1391 if (skb->len < len || len < offset)
1394 skb_set_transport_header(skb, offset);
1399 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1401 unsigned int len = skb_transport_offset(skb);
1403 len += sizeof(struct igmpv3_report);
1405 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1408 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1410 unsigned int len = skb_transport_offset(skb);
1412 len += sizeof(struct igmphdr);
1417 if (skb->len != len) {
1419 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1420 if (skb->len < len || !pskb_may_pull(skb, len))
1424 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1425 * all-systems destination addresses (224.0.0.1) for general queries
1427 if (!igmp_hdr(skb)->group &&
1428 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1434 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1436 switch (igmp_hdr(skb)->type) {
1437 case IGMP_HOST_LEAVE_MESSAGE:
1438 case IGMP_HOST_MEMBERSHIP_REPORT:
1439 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1442 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1443 return ip_mc_check_igmp_reportv3(skb);
1444 case IGMP_HOST_MEMBERSHIP_QUERY:
1445 return ip_mc_check_igmp_query(skb);
1451 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1453 return skb_checksum_simple_validate(skb);
1456 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1459 struct sk_buff *skb_chk;
1460 unsigned int transport_len;
1461 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1464 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1466 skb_chk = skb_checksum_trimmed(skb, transport_len,
1467 ip_mc_validate_checksum);
1471 if (!pskb_may_pull(skb_chk, len))
1474 ret = ip_mc_check_igmp_msg(skb_chk);
1479 *skb_trimmed = skb_chk;
1480 /* free now unneeded clone */
1481 else if (skb_chk != skb)
1487 if (ret && skb_chk && skb_chk != skb)
1494 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1495 * @skb: the skb to validate
1496 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1498 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1499 * skb transport header accordingly and returns zero.
1501 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1503 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1504 * -ENOMEM: A memory allocation failure happened.
1506 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1507 * to NULL): After parsing an IGMP packet successfully it will point to
1508 * an skb which has its tail aligned to the IP packet end. This might
1509 * either be the originally provided skb or a trimmed, cloned version if
1510 * the skb frame had data beyond the IP packet. A cloned skb allows us
1511 * to leave the original skb and its full frame unchanged (which might be
1512 * desirable for layer 2 frame jugglers).
1514 * Caller needs to set the skb network header and free any returned skb if it
1515 * differs from the provided skb.
1517 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1519 int ret = ip_mc_check_iphdr(skb);
1524 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1527 return __ip_mc_check_igmp(skb, skb_trimmed);
1529 EXPORT_SYMBOL(ip_mc_check_igmp);
1532 * Resend IGMP JOIN report; used by netdev notifier.
1534 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1536 #ifdef CONFIG_IP_MULTICAST
1537 struct ip_mc_list *im;
1539 struct net *net = dev_net(in_dev->dev);
1543 for_each_pmc_rtnl(in_dev, im) {
1544 if (im->multiaddr == IGMP_ALL_HOSTS)
1546 if (ipv4_is_local_multicast(im->multiaddr) &&
1547 !net->ipv4.sysctl_igmp_llm_reports)
1550 /* a failover is happening and switches
1551 * must be notified immediately
1553 if (IGMP_V1_SEEN(in_dev))
1554 type = IGMP_HOST_MEMBERSHIP_REPORT;
1555 else if (IGMP_V2_SEEN(in_dev))
1556 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1558 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1559 igmp_send_report(in_dev, im, type);
1565 * A socket has left a multicast group on device dev
1568 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1570 struct ip_mc_list *i;
1571 struct ip_mc_list __rcu **ip;
1575 for (ip = &in_dev->mc_list;
1576 (i = rtnl_dereference(*ip)) != NULL;
1577 ip = &i->next_rcu) {
1578 if (i->multiaddr == addr) {
1579 if (--i->users == 0) {
1580 ip_mc_hash_remove(in_dev, i);
1583 igmp_group_dropped(i);
1587 ip_rt_multicast_event(in_dev);
1596 EXPORT_SYMBOL(ip_mc_dec_group);
1598 /* Device changing type */
1600 void ip_mc_unmap(struct in_device *in_dev)
1602 struct ip_mc_list *pmc;
1606 for_each_pmc_rtnl(in_dev, pmc)
1607 igmp_group_dropped(pmc);
1610 void ip_mc_remap(struct in_device *in_dev)
1612 struct ip_mc_list *pmc;
1616 for_each_pmc_rtnl(in_dev, pmc)
1617 igmp_group_added(pmc);
1620 /* Device going down */
1622 void ip_mc_down(struct in_device *in_dev)
1624 struct ip_mc_list *pmc;
1628 for_each_pmc_rtnl(in_dev, pmc)
1629 igmp_group_dropped(pmc);
1631 #ifdef CONFIG_IP_MULTICAST
1632 in_dev->mr_ifc_count = 0;
1633 if (del_timer(&in_dev->mr_ifc_timer))
1634 __in_dev_put(in_dev);
1635 in_dev->mr_gq_running = 0;
1636 if (del_timer(&in_dev->mr_gq_timer))
1637 __in_dev_put(in_dev);
1638 igmpv3_clear_delrec(in_dev);
1641 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1644 void ip_mc_init_dev(struct in_device *in_dev)
1646 struct net *net = dev_net(in_dev->dev);
1649 #ifdef CONFIG_IP_MULTICAST
1650 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1651 (unsigned long)in_dev);
1652 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1653 (unsigned long)in_dev);
1654 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1657 spin_lock_init(&in_dev->mc_tomb_lock);
1660 /* Device going up */
1662 void ip_mc_up(struct in_device *in_dev)
1664 struct ip_mc_list *pmc;
1665 struct net *net = dev_net(in_dev->dev);
1669 #ifdef CONFIG_IP_MULTICAST
1670 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1672 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1674 for_each_pmc_rtnl(in_dev, pmc)
1675 igmp_group_added(pmc);
1679 * Device is about to be destroyed: clean up.
1682 void ip_mc_destroy_dev(struct in_device *in_dev)
1684 struct ip_mc_list *i;
1688 /* Deactivate timers */
1691 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1692 in_dev->mc_list = i->next_rcu;
1695 /* We've dropped the groups in ip_mc_down already */
1701 /* RTNL is locked */
1702 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1704 struct net_device *dev = NULL;
1705 struct in_device *idev = NULL;
1707 if (imr->imr_ifindex) {
1708 idev = inetdev_by_index(net, imr->imr_ifindex);
1711 if (imr->imr_address.s_addr) {
1712 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1718 struct rtable *rt = ip_route_output(net,
1719 imr->imr_multiaddr.s_addr,
1727 imr->imr_ifindex = dev->ifindex;
1728 idev = __in_dev_get_rtnl(dev);
1734 * Join a socket to a group
1737 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1740 struct ip_sf_list *psf, *psf_prev;
1744 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1745 if (psf->sf_inaddr == *psfsrc)
1749 if (!psf || psf->sf_count[sfmode] == 0) {
1750 /* source filter not found, or count wrong => bug */
1753 psf->sf_count[sfmode]--;
1754 if (psf->sf_count[sfmode] == 0) {
1755 ip_rt_multicast_event(pmc->interface);
1757 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1758 #ifdef CONFIG_IP_MULTICAST
1759 struct in_device *in_dev = pmc->interface;
1760 struct net *net = dev_net(in_dev->dev);
1763 /* no more filters for this source */
1765 psf_prev->sf_next = psf->sf_next;
1767 pmc->sources = psf->sf_next;
1768 #ifdef CONFIG_IP_MULTICAST
1769 if (psf->sf_oldin &&
1770 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1771 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1772 psf->sf_next = pmc->tomb;
1782 #ifndef CONFIG_IP_MULTICAST
1783 #define igmp_ifc_event(x) do { } while (0)
1786 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1787 int sfcount, __be32 *psfsrc, int delta)
1789 struct ip_mc_list *pmc;
1796 for_each_pmc_rcu(in_dev, pmc) {
1797 if (*pmca == pmc->multiaddr)
1801 /* MCA not found?? bug */
1805 spin_lock_bh(&pmc->lock);
1807 #ifdef CONFIG_IP_MULTICAST
1812 if (!pmc->sfcount[sfmode])
1814 pmc->sfcount[sfmode]--;
1817 for (i = 0; i < sfcount; i++) {
1818 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1820 changerec |= rv > 0;
1824 if (pmc->sfmode == MCAST_EXCLUDE &&
1825 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1826 pmc->sfcount[MCAST_INCLUDE]) {
1827 #ifdef CONFIG_IP_MULTICAST
1828 struct ip_sf_list *psf;
1829 struct net *net = dev_net(in_dev->dev);
1832 /* filter mode change */
1833 pmc->sfmode = MCAST_INCLUDE;
1834 #ifdef CONFIG_IP_MULTICAST
1835 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1836 in_dev->mr_ifc_count = pmc->crcount;
1837 for (psf = pmc->sources; psf; psf = psf->sf_next)
1838 psf->sf_crcount = 0;
1839 igmp_ifc_event(pmc->interface);
1840 } else if (sf_setstate(pmc) || changerec) {
1841 igmp_ifc_event(pmc->interface);
1845 spin_unlock_bh(&pmc->lock);
1850 * Add multicast single-source filter to the interface list
1852 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1855 struct ip_sf_list *psf, *psf_prev;
1858 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1859 if (psf->sf_inaddr == *psfsrc)
1864 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1867 psf->sf_inaddr = *psfsrc;
1869 psf_prev->sf_next = psf;
1873 psf->sf_count[sfmode]++;
1874 if (psf->sf_count[sfmode] == 1) {
1875 ip_rt_multicast_event(pmc->interface);
1880 #ifdef CONFIG_IP_MULTICAST
1881 static void sf_markstate(struct ip_mc_list *pmc)
1883 struct ip_sf_list *psf;
1884 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1886 for (psf = pmc->sources; psf; psf = psf->sf_next)
1887 if (pmc->sfcount[MCAST_EXCLUDE]) {
1888 psf->sf_oldin = mca_xcount ==
1889 psf->sf_count[MCAST_EXCLUDE] &&
1890 !psf->sf_count[MCAST_INCLUDE];
1892 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1895 static int sf_setstate(struct ip_mc_list *pmc)
1897 struct ip_sf_list *psf, *dpsf;
1898 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1899 int qrv = pmc->interface->mr_qrv;
1903 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1904 if (pmc->sfcount[MCAST_EXCLUDE]) {
1905 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1906 !psf->sf_count[MCAST_INCLUDE];
1908 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1910 if (!psf->sf_oldin) {
1911 struct ip_sf_list *prev = NULL;
1913 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1914 if (dpsf->sf_inaddr == psf->sf_inaddr)
1920 prev->sf_next = dpsf->sf_next;
1922 pmc->tomb = dpsf->sf_next;
1925 psf->sf_crcount = qrv;
1928 } else if (psf->sf_oldin) {
1930 psf->sf_crcount = 0;
1932 * add or update "delete" records if an active filter
1935 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1936 if (dpsf->sf_inaddr == psf->sf_inaddr)
1939 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1943 /* pmc->lock held by callers */
1944 dpsf->sf_next = pmc->tomb;
1947 dpsf->sf_crcount = qrv;
1956 * Add multicast source filter list to the interface list
1958 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1959 int sfcount, __be32 *psfsrc, int delta)
1961 struct ip_mc_list *pmc;
1968 for_each_pmc_rcu(in_dev, pmc) {
1969 if (*pmca == pmc->multiaddr)
1973 /* MCA not found?? bug */
1977 spin_lock_bh(&pmc->lock);
1980 #ifdef CONFIG_IP_MULTICAST
1983 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1985 pmc->sfcount[sfmode]++;
1987 for (i = 0; i < sfcount; i++) {
1988 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1996 pmc->sfcount[sfmode]--;
1997 for (j = 0; j < i; j++)
1998 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1999 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2000 #ifdef CONFIG_IP_MULTICAST
2001 struct ip_sf_list *psf;
2002 struct net *net = dev_net(pmc->interface->dev);
2003 in_dev = pmc->interface;
2006 /* filter mode change */
2007 if (pmc->sfcount[MCAST_EXCLUDE])
2008 pmc->sfmode = MCAST_EXCLUDE;
2009 else if (pmc->sfcount[MCAST_INCLUDE])
2010 pmc->sfmode = MCAST_INCLUDE;
2011 #ifdef CONFIG_IP_MULTICAST
2012 /* else no filters; keep old mode for reports */
2014 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2015 in_dev->mr_ifc_count = pmc->crcount;
2016 for (psf = pmc->sources; psf; psf = psf->sf_next)
2017 psf->sf_crcount = 0;
2018 igmp_ifc_event(in_dev);
2019 } else if (sf_setstate(pmc)) {
2020 igmp_ifc_event(in_dev);
2023 spin_unlock_bh(&pmc->lock);
2027 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2029 struct ip_sf_list *psf, *nextpsf;
2031 for (psf = pmc->tomb; psf; psf = nextpsf) {
2032 nextpsf = psf->sf_next;
2036 for (psf = pmc->sources; psf; psf = nextpsf) {
2037 nextpsf = psf->sf_next;
2040 pmc->sources = NULL;
2041 pmc->sfmode = MCAST_EXCLUDE;
2042 pmc->sfcount[MCAST_INCLUDE] = 0;
2043 pmc->sfcount[MCAST_EXCLUDE] = 1;
2046 /* Join a multicast group
2049 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2051 __be32 addr = imr->imr_multiaddr.s_addr;
2052 struct ip_mc_socklist *iml, *i;
2053 struct in_device *in_dev;
2054 struct inet_sock *inet = inet_sk(sk);
2055 struct net *net = sock_net(sk);
2062 if (!ipv4_is_multicast(addr))
2065 in_dev = ip_mc_find_dev(net, imr);
2073 ifindex = imr->imr_ifindex;
2074 for_each_pmc_rtnl(inet, i) {
2075 if (i->multi.imr_multiaddr.s_addr == addr &&
2076 i->multi.imr_ifindex == ifindex)
2081 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2083 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2087 memcpy(&iml->multi, imr, sizeof(*imr));
2088 iml->next_rcu = inet->mc_list;
2090 iml->sfmode = MCAST_EXCLUDE;
2091 rcu_assign_pointer(inet->mc_list, iml);
2092 ip_mc_inc_group(in_dev, addr);
2097 EXPORT_SYMBOL(ip_mc_join_group);
2099 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2100 struct in_device *in_dev)
2102 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2106 /* any-source empty exclude case */
2107 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2108 iml->sfmode, 0, NULL, 0);
2110 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2111 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2112 RCU_INIT_POINTER(iml->sflist, NULL);
2113 /* decrease mem now to avoid the memleak warning */
2114 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2115 kfree_rcu(psf, rcu);
2119 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2121 struct inet_sock *inet = inet_sk(sk);
2122 struct ip_mc_socklist *iml;
2123 struct ip_mc_socklist __rcu **imlp;
2124 struct in_device *in_dev;
2125 struct net *net = sock_net(sk);
2126 __be32 group = imr->imr_multiaddr.s_addr;
2128 int ret = -EADDRNOTAVAIL;
2132 in_dev = ip_mc_find_dev(net, imr);
2133 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2137 ifindex = imr->imr_ifindex;
2138 for (imlp = &inet->mc_list;
2139 (iml = rtnl_dereference(*imlp)) != NULL;
2140 imlp = &iml->next_rcu) {
2141 if (iml->multi.imr_multiaddr.s_addr != group)
2144 if (iml->multi.imr_ifindex != ifindex)
2146 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2147 iml->multi.imr_address.s_addr)
2150 (void) ip_mc_leave_src(sk, iml, in_dev);
2152 *imlp = iml->next_rcu;
2155 ip_mc_dec_group(in_dev, group);
2157 /* decrease mem now to avoid the memleak warning */
2158 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2159 kfree_rcu(iml, rcu);
2165 EXPORT_SYMBOL(ip_mc_leave_group);
2167 int ip_mc_source(int add, int omode, struct sock *sk, struct
2168 ip_mreq_source *mreqs, int ifindex)
2171 struct ip_mreqn imr;
2172 __be32 addr = mreqs->imr_multiaddr;
2173 struct ip_mc_socklist *pmc;
2174 struct in_device *in_dev = NULL;
2175 struct inet_sock *inet = inet_sk(sk);
2176 struct ip_sf_socklist *psl;
2177 struct net *net = sock_net(sk);
2181 if (!ipv4_is_multicast(addr))
2186 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2187 imr.imr_address.s_addr = mreqs->imr_interface;
2188 imr.imr_ifindex = ifindex;
2189 in_dev = ip_mc_find_dev(net, &imr);
2195 err = -EADDRNOTAVAIL;
2197 for_each_pmc_rtnl(inet, pmc) {
2198 if ((pmc->multi.imr_multiaddr.s_addr ==
2199 imr.imr_multiaddr.s_addr) &&
2200 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2203 if (!pmc) { /* must have a prior join */
2207 /* if a source filter was set, must be the same mode as before */
2209 if (pmc->sfmode != omode) {
2213 } else if (pmc->sfmode != omode) {
2214 /* allow mode switches for empty-set filters */
2215 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2216 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2218 pmc->sfmode = omode;
2221 psl = rtnl_dereference(pmc->sflist);
2224 goto done; /* err = -EADDRNOTAVAIL */
2226 for (i = 0; i < psl->sl_count; i++) {
2227 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2232 if (rv) /* source not found */
2233 goto done; /* err = -EADDRNOTAVAIL */
2235 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2236 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2241 /* update the interface filter */
2242 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2243 &mreqs->imr_sourceaddr, 1);
2245 for (j = i+1; j < psl->sl_count; j++)
2246 psl->sl_addr[j-1] = psl->sl_addr[j];
2251 /* else, add a new source to the filter */
2253 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2257 if (!psl || psl->sl_count == psl->sl_max) {
2258 struct ip_sf_socklist *newpsl;
2259 int count = IP_SFBLOCK;
2262 count += psl->sl_max;
2263 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2268 newpsl->sl_max = count;
2269 newpsl->sl_count = count - IP_SFBLOCK;
2271 for (i = 0; i < psl->sl_count; i++)
2272 newpsl->sl_addr[i] = psl->sl_addr[i];
2273 /* decrease mem now to avoid the memleak warning */
2274 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2275 kfree_rcu(psl, rcu);
2277 rcu_assign_pointer(pmc->sflist, newpsl);
2280 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2281 for (i = 0; i < psl->sl_count; i++) {
2282 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2287 if (rv == 0) /* address already there is an error */
2289 for (j = psl->sl_count-1; j >= i; j--)
2290 psl->sl_addr[j+1] = psl->sl_addr[j];
2291 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2294 /* update the interface list */
2295 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2296 &mreqs->imr_sourceaddr, 1);
2299 err = ip_mc_leave_group(sk, &imr);
2303 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2306 struct ip_mreqn imr;
2307 __be32 addr = msf->imsf_multiaddr;
2308 struct ip_mc_socklist *pmc;
2309 struct in_device *in_dev;
2310 struct inet_sock *inet = inet_sk(sk);
2311 struct ip_sf_socklist *newpsl, *psl;
2312 struct net *net = sock_net(sk);
2315 if (!ipv4_is_multicast(addr))
2317 if (msf->imsf_fmode != MCAST_INCLUDE &&
2318 msf->imsf_fmode != MCAST_EXCLUDE)
2323 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2324 imr.imr_address.s_addr = msf->imsf_interface;
2325 imr.imr_ifindex = ifindex;
2326 in_dev = ip_mc_find_dev(net, &imr);
2333 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2334 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2339 for_each_pmc_rtnl(inet, pmc) {
2340 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2341 pmc->multi.imr_ifindex == imr.imr_ifindex)
2344 if (!pmc) { /* must have a prior join */
2348 if (msf->imsf_numsrc) {
2349 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2355 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2356 memcpy(newpsl->sl_addr, msf->imsf_slist,
2357 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2358 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2359 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2361 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2366 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2367 msf->imsf_fmode, 0, NULL, 0);
2369 psl = rtnl_dereference(pmc->sflist);
2371 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2372 psl->sl_count, psl->sl_addr, 0);
2373 /* decrease mem now to avoid the memleak warning */
2374 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2375 kfree_rcu(psl, rcu);
2377 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2379 rcu_assign_pointer(pmc->sflist, newpsl);
2380 pmc->sfmode = msf->imsf_fmode;
2384 err = ip_mc_leave_group(sk, &imr);
2388 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2389 struct ip_msfilter __user *optval, int __user *optlen)
2391 int err, len, count, copycount;
2392 struct ip_mreqn imr;
2393 __be32 addr = msf->imsf_multiaddr;
2394 struct ip_mc_socklist *pmc;
2395 struct in_device *in_dev;
2396 struct inet_sock *inet = inet_sk(sk);
2397 struct ip_sf_socklist *psl;
2398 struct net *net = sock_net(sk);
2402 if (!ipv4_is_multicast(addr))
2405 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2406 imr.imr_address.s_addr = msf->imsf_interface;
2407 imr.imr_ifindex = 0;
2408 in_dev = ip_mc_find_dev(net, &imr);
2414 err = -EADDRNOTAVAIL;
2416 for_each_pmc_rtnl(inet, pmc) {
2417 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2418 pmc->multi.imr_ifindex == imr.imr_ifindex)
2421 if (!pmc) /* must have a prior join */
2423 msf->imsf_fmode = pmc->sfmode;
2424 psl = rtnl_dereference(pmc->sflist);
2429 count = psl->sl_count;
2431 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2432 len = copycount * sizeof(psl->sl_addr[0]);
2433 msf->imsf_numsrc = count;
2434 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2435 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2439 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2446 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2447 struct group_filter __user *optval, int __user *optlen)
2449 int err, i, count, copycount;
2450 struct sockaddr_in *psin;
2452 struct ip_mc_socklist *pmc;
2453 struct inet_sock *inet = inet_sk(sk);
2454 struct ip_sf_socklist *psl;
2458 psin = (struct sockaddr_in *)&gsf->gf_group;
2459 if (psin->sin_family != AF_INET)
2461 addr = psin->sin_addr.s_addr;
2462 if (!ipv4_is_multicast(addr))
2465 err = -EADDRNOTAVAIL;
2467 for_each_pmc_rtnl(inet, pmc) {
2468 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2469 pmc->multi.imr_ifindex == gsf->gf_interface)
2472 if (!pmc) /* must have a prior join */
2474 gsf->gf_fmode = pmc->sfmode;
2475 psl = rtnl_dereference(pmc->sflist);
2476 count = psl ? psl->sl_count : 0;
2477 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2478 gsf->gf_numsrc = count;
2479 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2480 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2483 for (i = 0; i < copycount; i++) {
2484 struct sockaddr_storage ss;
2486 psin = (struct sockaddr_in *)&ss;
2487 memset(&ss, 0, sizeof(ss));
2488 psin->sin_family = AF_INET;
2489 psin->sin_addr.s_addr = psl->sl_addr[i];
2490 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2499 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2501 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2503 struct inet_sock *inet = inet_sk(sk);
2504 struct ip_mc_socklist *pmc;
2505 struct ip_sf_socklist *psl;
2510 if (!ipv4_is_multicast(loc_addr))
2514 for_each_pmc_rcu(inet, pmc) {
2515 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2516 pmc->multi.imr_ifindex == dif)
2522 psl = rcu_dereference(pmc->sflist);
2523 ret = (pmc->sfmode == MCAST_EXCLUDE);
2527 for (i = 0; i < psl->sl_count; i++) {
2528 if (psl->sl_addr[i] == rmt_addr)
2532 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2534 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2544 * A socket is closing.
2547 void ip_mc_drop_socket(struct sock *sk)
2549 struct inet_sock *inet = inet_sk(sk);
2550 struct ip_mc_socklist *iml;
2551 struct net *net = sock_net(sk);
2557 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2558 struct in_device *in_dev;
2560 inet->mc_list = iml->next_rcu;
2561 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2562 (void) ip_mc_leave_src(sk, iml, in_dev);
2564 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2565 /* decrease mem now to avoid the memleak warning */
2566 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2567 kfree_rcu(iml, rcu);
2572 /* called with rcu_read_lock() */
2573 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2575 struct ip_mc_list *im;
2576 struct ip_mc_list __rcu **mc_hash;
2577 struct ip_sf_list *psf;
2580 mc_hash = rcu_dereference(in_dev->mc_hash);
2582 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2584 for (im = rcu_dereference(mc_hash[hash]);
2586 im = rcu_dereference(im->next_hash)) {
2587 if (im->multiaddr == mc_addr)
2591 for_each_pmc_rcu(in_dev, im) {
2592 if (im->multiaddr == mc_addr)
2596 if (im && proto == IPPROTO_IGMP) {
2600 for (psf = im->sources; psf; psf = psf->sf_next) {
2601 if (psf->sf_inaddr == src_addr)
2605 rv = psf->sf_count[MCAST_INCLUDE] ||
2606 psf->sf_count[MCAST_EXCLUDE] !=
2607 im->sfcount[MCAST_EXCLUDE];
2609 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2611 rv = 1; /* unspecified source; tentatively allow */
2616 #if defined(CONFIG_PROC_FS)
2617 struct igmp_mc_iter_state {
2618 struct seq_net_private p;
2619 struct net_device *dev;
2620 struct in_device *in_dev;
2623 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2625 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2627 struct net *net = seq_file_net(seq);
2628 struct ip_mc_list *im = NULL;
2629 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2631 state->in_dev = NULL;
2632 for_each_netdev_rcu(net, state->dev) {
2633 struct in_device *in_dev;
2635 in_dev = __in_dev_get_rcu(state->dev);
2638 im = rcu_dereference(in_dev->mc_list);
2640 state->in_dev = in_dev;
2647 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2649 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2651 im = rcu_dereference(im->next_rcu);
2653 state->dev = next_net_device_rcu(state->dev);
2655 state->in_dev = NULL;
2658 state->in_dev = __in_dev_get_rcu(state->dev);
2661 im = rcu_dereference(state->in_dev->mc_list);
2666 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2668 struct ip_mc_list *im = igmp_mc_get_first(seq);
2670 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2672 return pos ? NULL : im;
2675 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2679 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2682 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2684 struct ip_mc_list *im;
2685 if (v == SEQ_START_TOKEN)
2686 im = igmp_mc_get_first(seq);
2688 im = igmp_mc_get_next(seq, v);
2693 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2696 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2698 state->in_dev = NULL;
2703 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2705 if (v == SEQ_START_TOKEN)
2707 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2709 struct ip_mc_list *im = (struct ip_mc_list *)v;
2710 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2714 #ifdef CONFIG_IP_MULTICAST
2715 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2716 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2722 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2723 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2724 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2727 delta = im->timer.expires - jiffies;
2729 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2730 im->multiaddr, im->users,
2732 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2738 static const struct seq_operations igmp_mc_seq_ops = {
2739 .start = igmp_mc_seq_start,
2740 .next = igmp_mc_seq_next,
2741 .stop = igmp_mc_seq_stop,
2742 .show = igmp_mc_seq_show,
2745 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2747 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2748 sizeof(struct igmp_mc_iter_state));
2751 static const struct file_operations igmp_mc_seq_fops = {
2752 .owner = THIS_MODULE,
2753 .open = igmp_mc_seq_open,
2755 .llseek = seq_lseek,
2756 .release = seq_release_net,
2759 struct igmp_mcf_iter_state {
2760 struct seq_net_private p;
2761 struct net_device *dev;
2762 struct in_device *idev;
2763 struct ip_mc_list *im;
2766 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2768 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2770 struct net *net = seq_file_net(seq);
2771 struct ip_sf_list *psf = NULL;
2772 struct ip_mc_list *im = NULL;
2773 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2777 for_each_netdev_rcu(net, state->dev) {
2778 struct in_device *idev;
2779 idev = __in_dev_get_rcu(state->dev);
2780 if (unlikely(!idev))
2782 im = rcu_dereference(idev->mc_list);
2784 spin_lock_bh(&im->lock);
2791 spin_unlock_bh(&im->lock);
2797 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2799 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2803 spin_unlock_bh(&state->im->lock);
2804 state->im = state->im->next;
2805 while (!state->im) {
2806 state->dev = next_net_device_rcu(state->dev);
2811 state->idev = __in_dev_get_rcu(state->dev);
2814 state->im = rcu_dereference(state->idev->mc_list);
2818 spin_lock_bh(&state->im->lock);
2819 psf = state->im->sources;
2825 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2827 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2829 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2831 return pos ? NULL : psf;
2834 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2838 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2841 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2843 struct ip_sf_list *psf;
2844 if (v == SEQ_START_TOKEN)
2845 psf = igmp_mcf_get_first(seq);
2847 psf = igmp_mcf_get_next(seq, v);
2852 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2855 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2856 if (likely(state->im)) {
2857 spin_unlock_bh(&state->im->lock);
2865 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2867 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2868 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2870 if (v == SEQ_START_TOKEN) {
2871 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2875 "0x%08x %6lu %6lu\n",
2876 state->dev->ifindex, state->dev->name,
2877 ntohl(state->im->multiaddr),
2878 ntohl(psf->sf_inaddr),
2879 psf->sf_count[MCAST_INCLUDE],
2880 psf->sf_count[MCAST_EXCLUDE]);
2885 static const struct seq_operations igmp_mcf_seq_ops = {
2886 .start = igmp_mcf_seq_start,
2887 .next = igmp_mcf_seq_next,
2888 .stop = igmp_mcf_seq_stop,
2889 .show = igmp_mcf_seq_show,
2892 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2894 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2895 sizeof(struct igmp_mcf_iter_state));
2898 static const struct file_operations igmp_mcf_seq_fops = {
2899 .owner = THIS_MODULE,
2900 .open = igmp_mcf_seq_open,
2902 .llseek = seq_lseek,
2903 .release = seq_release_net,
2906 static int __net_init igmp_net_init(struct net *net)
2908 struct proc_dir_entry *pde;
2911 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2914 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2915 &igmp_mcf_seq_fops);
2918 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2919 SOCK_DGRAM, 0, net);
2921 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2929 remove_proc_entry("mcfilter", net->proc_net);
2931 remove_proc_entry("igmp", net->proc_net);
2936 static void __net_exit igmp_net_exit(struct net *net)
2938 remove_proc_entry("mcfilter", net->proc_net);
2939 remove_proc_entry("igmp", net->proc_net);
2940 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2943 static struct pernet_operations igmp_net_ops = {
2944 .init = igmp_net_init,
2945 .exit = igmp_net_exit,
2949 static int igmp_netdev_event(struct notifier_block *this,
2950 unsigned long event, void *ptr)
2952 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2953 struct in_device *in_dev;
2956 case NETDEV_RESEND_IGMP:
2957 in_dev = __in_dev_get_rtnl(dev);
2959 ip_mc_rejoin_groups(in_dev);
2967 static struct notifier_block igmp_notifier = {
2968 .notifier_call = igmp_netdev_event,
2971 int __init igmp_mc_init(void)
2973 #if defined(CONFIG_PROC_FS)
2976 err = register_pernet_subsys(&igmp_net_ops);
2979 err = register_netdevice_notifier(&igmp_notifier);
2981 goto reg_notif_fail;
2985 unregister_pernet_subsys(&igmp_net_ops);
2988 return register_netdevice_notifier(&igmp_notifier);