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 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
116 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
117 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
118 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
119 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
120 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
121 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
124 #define IGMP_INITIAL_REPORT_DELAY (1)
126 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
127 * IGMP specs require to report membership immediately after
128 * joining a group, but we delay the first report by a
129 * small interval. It seems more natural and still does not
130 * contradict to specs provided this delay is small enough.
133 #define IGMP_V1_SEEN(in_dev) \
134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
136 ((in_dev)->mr_v1_seen && \
137 time_before(jiffies, (in_dev)->mr_v1_seen)))
138 #define IGMP_V2_SEEN(in_dev) \
139 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
140 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
141 ((in_dev)->mr_v2_seen && \
142 time_before(jiffies, (in_dev)->mr_v2_seen)))
144 static int unsolicited_report_interval(struct in_device *in_dev)
146 int interval_ms, interval_jiffies;
148 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
149 interval_ms = IN_DEV_CONF_GET(
151 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
153 interval_ms = IN_DEV_CONF_GET(
155 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
157 interval_jiffies = msecs_to_jiffies(interval_ms);
159 /* _timer functions can't handle a delay of 0 jiffies so ensure
160 * we always return a positive value.
162 if (interval_jiffies <= 0)
163 interval_jiffies = 1;
164 return interval_jiffies;
167 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
168 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
169 static void igmpv3_clear_delrec(struct in_device *in_dev);
170 static int sf_setstate(struct ip_mc_list *pmc);
171 static void sf_markstate(struct ip_mc_list *pmc);
173 static void ip_mc_clear_src(struct ip_mc_list *pmc);
174 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
175 int sfcount, __be32 *psfsrc, int delta);
177 static void ip_ma_put(struct ip_mc_list *im)
179 if (atomic_dec_and_test(&im->refcnt)) {
180 in_dev_put(im->interface);
185 #define for_each_pmc_rcu(in_dev, pmc) \
186 for (pmc = rcu_dereference(in_dev->mc_list); \
188 pmc = rcu_dereference(pmc->next_rcu))
190 #define for_each_pmc_rtnl(in_dev, pmc) \
191 for (pmc = rtnl_dereference(in_dev->mc_list); \
193 pmc = rtnl_dereference(pmc->next_rcu))
195 #ifdef CONFIG_IP_MULTICAST
201 static void igmp_stop_timer(struct ip_mc_list *im)
203 spin_lock_bh(&im->lock);
204 if (del_timer(&im->timer))
205 atomic_dec(&im->refcnt);
208 im->unsolicit_count = 0;
209 spin_unlock_bh(&im->lock);
212 /* It must be called with locked im->lock */
213 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
215 int tv = prandom_u32() % max_delay;
218 if (!mod_timer(&im->timer, jiffies+tv+2))
219 atomic_inc(&im->refcnt);
222 static void igmp_gq_start_timer(struct in_device *in_dev)
224 int tv = prandom_u32() % in_dev->mr_maxdelay;
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
231 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
233 int tv = prandom_u32() % delay;
235 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
239 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
241 spin_lock_bh(&im->lock);
242 im->unsolicit_count = 0;
243 if (del_timer(&im->timer)) {
244 if ((long)(im->timer.expires-jiffies) < max_delay) {
245 add_timer(&im->timer);
247 spin_unlock_bh(&im->lock);
250 atomic_dec(&im->refcnt);
252 igmp_start_timer(im, max_delay);
253 spin_unlock_bh(&im->lock);
258 * Send an IGMP report.
261 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
264 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
265 int gdeleted, int sdeleted)
268 case IGMPV3_MODE_IS_INCLUDE:
269 case IGMPV3_MODE_IS_EXCLUDE:
270 if (gdeleted || sdeleted)
272 if (!(pmc->gsquery && !psf->sf_gsresp)) {
273 if (pmc->sfmode == MCAST_INCLUDE)
275 /* don't include if this source is excluded
278 if (psf->sf_count[MCAST_INCLUDE])
279 return type == IGMPV3_MODE_IS_INCLUDE;
280 return pmc->sfcount[MCAST_EXCLUDE] ==
281 psf->sf_count[MCAST_EXCLUDE];
284 case IGMPV3_CHANGE_TO_INCLUDE:
285 if (gdeleted || sdeleted)
287 return psf->sf_count[MCAST_INCLUDE] != 0;
288 case IGMPV3_CHANGE_TO_EXCLUDE:
289 if (gdeleted || sdeleted)
291 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
292 psf->sf_count[MCAST_INCLUDE])
294 return pmc->sfcount[MCAST_EXCLUDE] ==
295 psf->sf_count[MCAST_EXCLUDE];
296 case IGMPV3_ALLOW_NEW_SOURCES:
297 if (gdeleted || !psf->sf_crcount)
299 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
300 case IGMPV3_BLOCK_OLD_SOURCES:
301 if (pmc->sfmode == MCAST_INCLUDE)
302 return gdeleted || (psf->sf_crcount && sdeleted);
303 return psf->sf_crcount && !gdeleted && !sdeleted;
309 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
311 struct ip_sf_list *psf;
314 for (psf = pmc->sources; psf; psf = psf->sf_next) {
315 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
322 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
327 struct igmpv3_report *pig;
328 struct net *net = dev_net(dev);
330 int hlen = LL_RESERVED_SPACE(dev);
331 int tlen = dev->needed_tailroom;
332 unsigned int size = mtu;
335 skb = alloc_skb(size + hlen + tlen,
336 GFP_ATOMIC | __GFP_NOWARN);
343 skb->priority = TC_PRIO_CONTROL;
345 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
347 IPPROTO_IGMP, 0, dev->ifindex);
353 skb_dst_set(skb, &rt->dst);
356 skb->reserved_tailroom = skb_end_offset(skb) -
357 min(mtu, skb_end_offset(skb));
358 skb_reserve(skb, hlen);
360 skb_reset_network_header(skb);
362 skb_put(skb, sizeof(struct iphdr) + 4);
365 pip->ihl = (sizeof(struct iphdr)+4)>>2;
367 pip->frag_off = htons(IP_DF);
369 pip->daddr = fl4.daddr;
370 pip->saddr = fl4.saddr;
371 pip->protocol = IPPROTO_IGMP;
372 pip->tot_len = 0; /* filled in later */
373 ip_select_ident(net, skb, NULL);
374 ((u8 *)&pip[1])[0] = IPOPT_RA;
375 ((u8 *)&pip[1])[1] = 4;
376 ((u8 *)&pip[1])[2] = 0;
377 ((u8 *)&pip[1])[3] = 0;
379 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
380 skb_put(skb, sizeof(*pig));
381 pig = igmpv3_report_hdr(skb);
382 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
390 static int igmpv3_sendpack(struct sk_buff *skb)
392 struct igmphdr *pig = igmp_hdr(skb);
393 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
395 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
397 return ip_local_out(skb);
400 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
402 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
405 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
406 int type, struct igmpv3_grec **ppgr)
408 struct net_device *dev = pmc->interface->dev;
409 struct igmpv3_report *pih;
410 struct igmpv3_grec *pgr;
413 skb = igmpv3_newpack(dev, dev->mtu);
416 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
417 pgr->grec_type = type;
418 pgr->grec_auxwords = 0;
420 pgr->grec_mca = pmc->multiaddr;
421 pih = igmpv3_report_hdr(skb);
422 pih->ngrec = htons(ntohs(pih->ngrec)+1);
427 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
429 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
430 int type, int gdeleted, int sdeleted)
432 struct net_device *dev = pmc->interface->dev;
433 struct igmpv3_report *pih;
434 struct igmpv3_grec *pgr = NULL;
435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
436 int scount, stotal, first, isquery, truncate;
438 if (pmc->multiaddr == IGMP_ALL_HOSTS)
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;
545 for_each_pmc_rcu(in_dev, pmc) {
546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
548 spin_lock_bh(&pmc->lock);
549 if (pmc->sfcount[MCAST_EXCLUDE])
550 type = IGMPV3_MODE_IS_EXCLUDE;
552 type = IGMPV3_MODE_IS_INCLUDE;
553 skb = add_grec(skb, pmc, type, 0, 0);
554 spin_unlock_bh(&pmc->lock);
558 spin_lock_bh(&pmc->lock);
559 if (pmc->sfcount[MCAST_EXCLUDE])
560 type = IGMPV3_MODE_IS_EXCLUDE;
562 type = IGMPV3_MODE_IS_INCLUDE;
563 skb = add_grec(skb, pmc, type, 0, 0);
564 spin_unlock_bh(&pmc->lock);
568 return igmpv3_sendpack(skb);
572 * remove zero-count source records from a source filter list
574 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
576 struct ip_sf_list *psf_prev, *psf_next, *psf;
579 for (psf = *ppsf; psf; psf = psf_next) {
580 psf_next = psf->sf_next;
581 if (psf->sf_crcount == 0) {
583 psf_prev->sf_next = psf->sf_next;
585 *ppsf = psf->sf_next;
592 static void igmpv3_send_cr(struct in_device *in_dev)
594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
595 struct sk_buff *skb = NULL;
599 spin_lock_bh(&in_dev->mc_tomb_lock);
603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
604 pmc_next = pmc->next;
605 if (pmc->sfmode == MCAST_INCLUDE) {
606 type = IGMPV3_BLOCK_OLD_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 skb = add_grec(skb, pmc, type, 1, 0);
609 skb = add_grec(skb, pmc, dtype, 1, 1);
612 if (pmc->sfmode == MCAST_EXCLUDE) {
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 1, 0);
617 if (pmc->crcount == 0) {
618 igmpv3_clear_zeros(&pmc->tomb);
619 igmpv3_clear_zeros(&pmc->sources);
622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
624 pmc_prev->next = pmc_next;
626 in_dev->mc_tomb = pmc_next;
627 in_dev_put(pmc->interface);
632 spin_unlock_bh(&in_dev->mc_tomb_lock);
635 for_each_pmc_rcu(in_dev, pmc) {
636 spin_lock_bh(&pmc->lock);
637 if (pmc->sfcount[MCAST_EXCLUDE]) {
638 type = IGMPV3_BLOCK_OLD_SOURCES;
639 dtype = IGMPV3_ALLOW_NEW_SOURCES;
641 type = IGMPV3_ALLOW_NEW_SOURCES;
642 dtype = IGMPV3_BLOCK_OLD_SOURCES;
644 skb = add_grec(skb, pmc, type, 0, 0);
645 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
647 /* filter mode changes */
649 if (pmc->sfmode == MCAST_EXCLUDE)
650 type = IGMPV3_CHANGE_TO_EXCLUDE;
652 type = IGMPV3_CHANGE_TO_INCLUDE;
653 skb = add_grec(skb, pmc, type, 0, 0);
656 spin_unlock_bh(&pmc->lock);
662 (void) igmpv3_sendpack(skb);
665 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
672 struct net_device *dev = in_dev->dev;
673 struct net *net = dev_net(dev);
674 __be32 group = pmc ? pmc->multiaddr : 0;
679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
680 return igmpv3_send_report(in_dev, pmc);
681 else if (type == IGMP_HOST_LEAVE_MESSAGE)
682 dst = IGMP_ALL_ROUTER;
686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
688 IPPROTO_IGMP, 0, dev->ifindex);
692 hlen = LL_RESERVED_SPACE(dev);
693 tlen = dev->needed_tailroom;
694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
699 skb->priority = TC_PRIO_CONTROL;
701 skb_dst_set(skb, &rt->dst);
703 skb_reserve(skb, hlen);
705 skb_reset_network_header(skb);
707 skb_put(skb, sizeof(struct iphdr) + 4);
710 iph->ihl = (sizeof(struct iphdr)+4)>>2;
712 iph->frag_off = htons(IP_DF);
715 iph->saddr = fl4.saddr;
716 iph->protocol = IPPROTO_IGMP;
717 ip_select_ident(net, skb, NULL);
718 ((u8 *)&iph[1])[0] = IPOPT_RA;
719 ((u8 *)&iph[1])[1] = 4;
720 ((u8 *)&iph[1])[2] = 0;
721 ((u8 *)&iph[1])[3] = 0;
723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
730 return ip_local_out(skb);
733 static void igmp_gq_timer_expire(unsigned long data)
735 struct in_device *in_dev = (struct in_device *)data;
737 in_dev->mr_gq_running = 0;
738 igmpv3_send_report(in_dev, NULL);
742 static void igmp_ifc_timer_expire(unsigned long data)
744 struct in_device *in_dev = (struct in_device *)data;
746 igmpv3_send_cr(in_dev);
747 if (in_dev->mr_ifc_count) {
748 in_dev->mr_ifc_count--;
749 igmp_ifc_start_timer(in_dev,
750 unsolicited_report_interval(in_dev));
755 static void igmp_ifc_event(struct in_device *in_dev)
757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
759 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
760 igmp_ifc_start_timer(in_dev, 1);
764 static void igmp_timer_expire(unsigned long data)
766 struct ip_mc_list *im = (struct ip_mc_list *)data;
767 struct in_device *in_dev = im->interface;
769 spin_lock(&im->lock);
772 if (im->unsolicit_count) {
773 im->unsolicit_count--;
774 igmp_start_timer(im, unsolicited_report_interval(in_dev));
777 spin_unlock(&im->lock);
779 if (IGMP_V1_SEEN(in_dev))
780 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
781 else if (IGMP_V2_SEEN(in_dev))
782 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
784 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
789 /* mark EXCLUDE-mode sources */
790 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
792 struct ip_sf_list *psf;
796 for (psf = pmc->sources; psf; psf = psf->sf_next) {
799 for (i = 0; i < nsrcs; i++) {
800 /* skip inactive filters */
801 if (psf->sf_count[MCAST_INCLUDE] ||
802 pmc->sfcount[MCAST_EXCLUDE] !=
803 psf->sf_count[MCAST_EXCLUDE])
805 if (srcs[i] == psf->sf_inaddr) {
812 if (scount == nsrcs) /* all sources excluded */
817 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
819 struct ip_sf_list *psf;
822 if (pmc->sfmode == MCAST_EXCLUDE)
823 return igmp_xmarksources(pmc, nsrcs, srcs);
825 /* mark INCLUDE-mode sources */
827 for (psf = pmc->sources; psf; psf = psf->sf_next) {
830 for (i = 0; i < nsrcs; i++)
831 if (srcs[i] == psf->sf_inaddr) {
845 /* return true if packet was dropped */
846 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
848 struct ip_mc_list *im;
850 /* Timers are only set for non-local groups */
852 if (group == IGMP_ALL_HOSTS)
856 for_each_pmc_rcu(in_dev, im) {
857 if (im->multiaddr == group) {
866 /* return true if packet was dropped */
867 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
870 struct igmphdr *ih = igmp_hdr(skb);
871 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
872 struct ip_mc_list *im;
873 __be32 group = ih->group;
880 /* Alas, old v1 router presents here. */
882 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
883 in_dev->mr_v1_seen = jiffies +
884 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
887 /* v2 router present */
888 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
889 in_dev->mr_v2_seen = jiffies +
890 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
892 /* cancel the interface change timer */
893 in_dev->mr_ifc_count = 0;
894 if (del_timer(&in_dev->mr_ifc_timer))
895 __in_dev_put(in_dev);
896 /* clear deleted report items */
897 igmpv3_clear_delrec(in_dev);
898 } else if (len < 12) {
899 return true; /* ignore bogus packet; freed by caller */
900 } else if (IGMP_V1_SEEN(in_dev)) {
901 /* This is a v3 query with v1 queriers present */
902 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
904 } else if (IGMP_V2_SEEN(in_dev)) {
905 /* this is a v3 query with v2 queriers present;
906 * Interpretation of the max_delay code is problematic here.
907 * A real v2 host would use ih_code directly, while v3 has a
908 * different encoding. We use the v3 encoding as more likely
909 * to be intended in a v3 query.
911 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
913 max_delay = 1; /* can't mod w/ 0 */
915 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
918 ih3 = igmpv3_query_hdr(skb);
920 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
921 + ntohs(ih3->nsrcs)*sizeof(__be32)))
923 ih3 = igmpv3_query_hdr(skb);
926 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
928 max_delay = 1; /* can't mod w/ 0 */
929 in_dev->mr_maxdelay = max_delay;
931 in_dev->mr_qrv = ih3->qrv;
932 if (!group) { /* general query */
934 return true; /* no sources allowed */
935 igmp_gq_start_timer(in_dev);
938 /* mark sources to include, if group & source-specific */
939 mark = ih3->nsrcs != 0;
943 * - Start the timers in all of our membership records
944 * that the query applies to for the interface on
945 * which the query arrived excl. those that belong
946 * to a "local" group (224.0.0.X)
947 * - For timers already running check if they need to
949 * - Use the igmp->igmp_code field as the maximum
953 for_each_pmc_rcu(in_dev, im) {
956 if (group && group != im->multiaddr)
958 if (im->multiaddr == IGMP_ALL_HOSTS)
960 spin_lock_bh(&im->lock);
962 im->gsquery = im->gsquery && mark;
965 changed = !im->gsquery ||
966 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
967 spin_unlock_bh(&im->lock);
969 igmp_mod_timer(im, max_delay);
975 /* called in rcu_read_lock() section */
976 int igmp_rcv(struct sk_buff *skb)
978 /* This basically follows the spec line by line -- see RFC1112 */
980 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
987 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
990 if (skb_checksum_simple_validate(skb))
995 case IGMP_HOST_MEMBERSHIP_QUERY:
996 dropped = igmp_heard_query(in_dev, skb, len);
998 case IGMP_HOST_MEMBERSHIP_REPORT:
999 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1000 /* Is it our report looped back? */
1001 if (rt_is_output_route(skb_rtable(skb)))
1003 /* don't rely on MC router hearing unicast reports */
1004 if (skb->pkt_type == PACKET_MULTICAST ||
1005 skb->pkt_type == PACKET_BROADCAST)
1006 dropped = igmp_heard_report(in_dev, ih->group);
1009 #ifdef CONFIG_IP_PIMSM_V1
1010 return pim_rcv_v1(skb);
1012 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1015 case IGMP_HOST_LEAVE_MESSAGE:
1017 case IGMP_MTRACE_RESP:
1035 * Add a filter to a device
1038 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1040 char buf[MAX_ADDR_LEN];
1041 struct net_device *dev = in_dev->dev;
1043 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1044 We will get multicast token leakage, when IFF_MULTICAST
1045 is changed. This check should be done in ndo_set_rx_mode
1046 routine. Something sort of:
1047 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1050 if (arp_mc_map(addr, buf, dev, 0) == 0)
1051 dev_mc_add(dev, buf);
1055 * Remove a filter from a device
1058 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1060 char buf[MAX_ADDR_LEN];
1061 struct net_device *dev = in_dev->dev;
1063 if (arp_mc_map(addr, buf, dev, 0) == 0)
1064 dev_mc_del(dev, buf);
1067 #ifdef CONFIG_IP_MULTICAST
1069 * deleted ip_mc_list manipulation
1071 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1073 struct ip_mc_list *pmc;
1075 /* this is an "ip_mc_list" for convenience; only the fields below
1076 * are actually used. In particular, the refcnt and users are not
1077 * used for management of the delete list. Using the same structure
1078 * for deleted items allows change reports to use common code with
1079 * non-deleted or query-response MCA's.
1081 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1084 spin_lock_bh(&im->lock);
1085 pmc->interface = im->interface;
1086 in_dev_hold(in_dev);
1087 pmc->multiaddr = im->multiaddr;
1088 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1089 pmc->sfmode = im->sfmode;
1090 if (pmc->sfmode == MCAST_INCLUDE) {
1091 struct ip_sf_list *psf;
1093 pmc->tomb = im->tomb;
1094 pmc->sources = im->sources;
1095 im->tomb = im->sources = NULL;
1096 for (psf = pmc->sources; psf; psf = psf->sf_next)
1097 psf->sf_crcount = pmc->crcount;
1099 spin_unlock_bh(&im->lock);
1101 spin_lock_bh(&in_dev->mc_tomb_lock);
1102 pmc->next = in_dev->mc_tomb;
1103 in_dev->mc_tomb = pmc;
1104 spin_unlock_bh(&in_dev->mc_tomb_lock);
1107 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1109 struct ip_mc_list *pmc, *pmc_prev;
1110 struct ip_sf_list *psf, *psf_next;
1112 spin_lock_bh(&in_dev->mc_tomb_lock);
1114 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1115 if (pmc->multiaddr == multiaddr)
1121 pmc_prev->next = pmc->next;
1123 in_dev->mc_tomb = pmc->next;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1127 for (psf = pmc->tomb; psf; psf = psf_next) {
1128 psf_next = psf->sf_next;
1131 in_dev_put(pmc->interface);
1136 static void igmpv3_clear_delrec(struct in_device *in_dev)
1138 struct ip_mc_list *pmc, *nextpmc;
1140 spin_lock_bh(&in_dev->mc_tomb_lock);
1141 pmc = in_dev->mc_tomb;
1142 in_dev->mc_tomb = NULL;
1143 spin_unlock_bh(&in_dev->mc_tomb_lock);
1145 for (; pmc; pmc = nextpmc) {
1146 nextpmc = pmc->next;
1147 ip_mc_clear_src(pmc);
1148 in_dev_put(pmc->interface);
1151 /* clear dead sources, too */
1153 for_each_pmc_rcu(in_dev, pmc) {
1154 struct ip_sf_list *psf, *psf_next;
1156 spin_lock_bh(&pmc->lock);
1159 spin_unlock_bh(&pmc->lock);
1160 for (; psf; psf = psf_next) {
1161 psf_next = psf->sf_next;
1169 static void igmp_group_dropped(struct ip_mc_list *im)
1171 struct in_device *in_dev = im->interface;
1172 #ifdef CONFIG_IP_MULTICAST
1178 ip_mc_filter_del(in_dev, im->multiaddr);
1181 #ifdef CONFIG_IP_MULTICAST
1182 if (im->multiaddr == IGMP_ALL_HOSTS)
1185 reporter = im->reporter;
1186 igmp_stop_timer(im);
1188 if (!in_dev->dead) {
1189 if (IGMP_V1_SEEN(in_dev))
1191 if (IGMP_V2_SEEN(in_dev)) {
1193 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1197 igmpv3_add_delrec(in_dev, im);
1199 igmp_ifc_event(in_dev);
1204 static void igmp_group_added(struct ip_mc_list *im)
1206 struct in_device *in_dev = im->interface;
1208 if (im->loaded == 0) {
1210 ip_mc_filter_add(in_dev, im->multiaddr);
1213 #ifdef CONFIG_IP_MULTICAST
1214 if (im->multiaddr == IGMP_ALL_HOSTS)
1219 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1220 spin_lock_bh(&im->lock);
1221 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1222 spin_unlock_bh(&im->lock);
1227 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1228 igmp_ifc_event(in_dev);
1234 * Multicast list managers
1237 static u32 ip_mc_hash(const struct ip_mc_list *im)
1239 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1242 static void ip_mc_hash_add(struct in_device *in_dev,
1243 struct ip_mc_list *im)
1245 struct ip_mc_list __rcu **mc_hash;
1248 mc_hash = rtnl_dereference(in_dev->mc_hash);
1250 hash = ip_mc_hash(im);
1251 im->next_hash = mc_hash[hash];
1252 rcu_assign_pointer(mc_hash[hash], im);
1256 /* do not use a hash table for small number of items */
1257 if (in_dev->mc_count < 4)
1260 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1265 for_each_pmc_rtnl(in_dev, im) {
1266 hash = ip_mc_hash(im);
1267 im->next_hash = mc_hash[hash];
1268 RCU_INIT_POINTER(mc_hash[hash], im);
1271 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1274 static void ip_mc_hash_remove(struct in_device *in_dev,
1275 struct ip_mc_list *im)
1277 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1278 struct ip_mc_list *aux;
1282 mc_hash += ip_mc_hash(im);
1283 while ((aux = rtnl_dereference(*mc_hash)) != im)
1284 mc_hash = &aux->next_hash;
1285 *mc_hash = im->next_hash;
1290 * A socket has joined a multicast group on device dev.
1293 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1295 struct ip_mc_list *im;
1299 for_each_pmc_rtnl(in_dev, im) {
1300 if (im->multiaddr == addr) {
1302 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1307 im = kzalloc(sizeof(*im), GFP_KERNEL);
1312 im->interface = in_dev;
1313 in_dev_hold(in_dev);
1314 im->multiaddr = addr;
1315 /* initial mode is (EX, empty) */
1316 im->sfmode = MCAST_EXCLUDE;
1317 im->sfcount[MCAST_EXCLUDE] = 1;
1318 atomic_set(&im->refcnt, 1);
1319 spin_lock_init(&im->lock);
1320 #ifdef CONFIG_IP_MULTICAST
1321 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1322 im->unsolicit_count = sysctl_igmp_qrv;
1325 im->next_rcu = in_dev->mc_list;
1327 rcu_assign_pointer(in_dev->mc_list, im);
1329 ip_mc_hash_add(in_dev, im);
1331 #ifdef CONFIG_IP_MULTICAST
1332 igmpv3_del_delrec(in_dev, im->multiaddr);
1334 igmp_group_added(im);
1336 ip_rt_multicast_event(in_dev);
1340 EXPORT_SYMBOL(ip_mc_inc_group);
1342 static int ip_mc_check_iphdr(struct sk_buff *skb)
1344 const struct iphdr *iph;
1346 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1348 if (!pskb_may_pull(skb, offset))
1353 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1356 offset += ip_hdrlen(skb) - sizeof(*iph);
1358 if (!pskb_may_pull(skb, offset))
1363 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1366 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1367 if (skb->len < len || len < offset)
1370 skb_set_transport_header(skb, offset);
1375 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1377 unsigned int len = skb_transport_offset(skb);
1379 len += sizeof(struct igmpv3_report);
1381 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1384 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1386 unsigned int len = skb_transport_offset(skb);
1388 len += sizeof(struct igmphdr);
1393 if (skb->len != len) {
1395 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1396 if (skb->len < len || !pskb_may_pull(skb, len))
1400 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1401 * all-systems destination addresses (224.0.0.1) for general queries
1403 if (!igmp_hdr(skb)->group &&
1404 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1410 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1412 switch (igmp_hdr(skb)->type) {
1413 case IGMP_HOST_LEAVE_MESSAGE:
1414 case IGMP_HOST_MEMBERSHIP_REPORT:
1415 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1418 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1419 return ip_mc_check_igmp_reportv3(skb);
1420 case IGMP_HOST_MEMBERSHIP_QUERY:
1421 return ip_mc_check_igmp_query(skb);
1427 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1429 return skb_checksum_simple_validate(skb);
1432 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1435 struct sk_buff *skb_chk;
1436 unsigned int transport_len;
1437 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1440 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1442 skb_chk = skb_checksum_trimmed(skb, transport_len,
1443 ip_mc_validate_checksum);
1447 if (!pskb_may_pull(skb_chk, len))
1450 ret = ip_mc_check_igmp_msg(skb_chk);
1455 *skb_trimmed = skb_chk;
1456 /* free now unneeded clone */
1457 else if (skb_chk != skb)
1463 if (ret && skb_chk && skb_chk != skb)
1470 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1471 * @skb: the skb to validate
1472 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1474 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1475 * skb transport header accordingly and returns zero.
1477 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1479 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1480 * -ENOMEM: A memory allocation failure happened.
1482 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1483 * to NULL): After parsing an IGMP packet successfully it will point to
1484 * an skb which has its tail aligned to the IP packet end. This might
1485 * either be the originally provided skb or a trimmed, cloned version if
1486 * the skb frame had data beyond the IP packet. A cloned skb allows us
1487 * to leave the original skb and its full frame unchanged (which might be
1488 * desirable for layer 2 frame jugglers).
1490 * Caller needs to set the skb network header and free any returned skb if it
1491 * differs from the provided skb.
1493 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1495 int ret = ip_mc_check_iphdr(skb);
1500 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1503 return __ip_mc_check_igmp(skb, skb_trimmed);
1505 EXPORT_SYMBOL(ip_mc_check_igmp);
1508 * Resend IGMP JOIN report; used by netdev notifier.
1510 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1512 #ifdef CONFIG_IP_MULTICAST
1513 struct ip_mc_list *im;
1518 for_each_pmc_rtnl(in_dev, im) {
1519 if (im->multiaddr == IGMP_ALL_HOSTS)
1522 /* a failover is happening and switches
1523 * must be notified immediately
1525 if (IGMP_V1_SEEN(in_dev))
1526 type = IGMP_HOST_MEMBERSHIP_REPORT;
1527 else if (IGMP_V2_SEEN(in_dev))
1528 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1530 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1531 igmp_send_report(in_dev, im, type);
1537 * A socket has left a multicast group on device dev
1540 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1542 struct ip_mc_list *i;
1543 struct ip_mc_list __rcu **ip;
1547 for (ip = &in_dev->mc_list;
1548 (i = rtnl_dereference(*ip)) != NULL;
1549 ip = &i->next_rcu) {
1550 if (i->multiaddr == addr) {
1551 if (--i->users == 0) {
1552 ip_mc_hash_remove(in_dev, i);
1555 igmp_group_dropped(i);
1559 ip_rt_multicast_event(in_dev);
1568 EXPORT_SYMBOL(ip_mc_dec_group);
1570 /* Device changing type */
1572 void ip_mc_unmap(struct in_device *in_dev)
1574 struct ip_mc_list *pmc;
1578 for_each_pmc_rtnl(in_dev, pmc)
1579 igmp_group_dropped(pmc);
1582 void ip_mc_remap(struct in_device *in_dev)
1584 struct ip_mc_list *pmc;
1588 for_each_pmc_rtnl(in_dev, pmc)
1589 igmp_group_added(pmc);
1592 /* Device going down */
1594 void ip_mc_down(struct in_device *in_dev)
1596 struct ip_mc_list *pmc;
1600 for_each_pmc_rtnl(in_dev, pmc)
1601 igmp_group_dropped(pmc);
1603 #ifdef CONFIG_IP_MULTICAST
1604 in_dev->mr_ifc_count = 0;
1605 if (del_timer(&in_dev->mr_ifc_timer))
1606 __in_dev_put(in_dev);
1607 in_dev->mr_gq_running = 0;
1608 if (del_timer(&in_dev->mr_gq_timer))
1609 __in_dev_put(in_dev);
1610 igmpv3_clear_delrec(in_dev);
1613 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1616 void ip_mc_init_dev(struct in_device *in_dev)
1620 #ifdef CONFIG_IP_MULTICAST
1621 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1622 (unsigned long)in_dev);
1623 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1624 (unsigned long)in_dev);
1625 in_dev->mr_qrv = sysctl_igmp_qrv;
1628 spin_lock_init(&in_dev->mc_tomb_lock);
1631 /* Device going up */
1633 void ip_mc_up(struct in_device *in_dev)
1635 struct ip_mc_list *pmc;
1639 #ifdef CONFIG_IP_MULTICAST
1640 in_dev->mr_qrv = sysctl_igmp_qrv;
1642 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1644 for_each_pmc_rtnl(in_dev, pmc)
1645 igmp_group_added(pmc);
1649 * Device is about to be destroyed: clean up.
1652 void ip_mc_destroy_dev(struct in_device *in_dev)
1654 struct ip_mc_list *i;
1658 /* Deactivate timers */
1661 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1662 in_dev->mc_list = i->next_rcu;
1665 /* We've dropped the groups in ip_mc_down already */
1671 /* RTNL is locked */
1672 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1674 struct net_device *dev = NULL;
1675 struct in_device *idev = NULL;
1677 if (imr->imr_ifindex) {
1678 idev = inetdev_by_index(net, imr->imr_ifindex);
1681 if (imr->imr_address.s_addr) {
1682 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1688 struct rtable *rt = ip_route_output(net,
1689 imr->imr_multiaddr.s_addr,
1697 imr->imr_ifindex = dev->ifindex;
1698 idev = __in_dev_get_rtnl(dev);
1704 * Join a socket to a group
1706 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1707 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1708 #ifdef CONFIG_IP_MULTICAST
1709 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1712 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1715 struct ip_sf_list *psf, *psf_prev;
1719 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1720 if (psf->sf_inaddr == *psfsrc)
1724 if (!psf || psf->sf_count[sfmode] == 0) {
1725 /* source filter not found, or count wrong => bug */
1728 psf->sf_count[sfmode]--;
1729 if (psf->sf_count[sfmode] == 0) {
1730 ip_rt_multicast_event(pmc->interface);
1732 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1733 #ifdef CONFIG_IP_MULTICAST
1734 struct in_device *in_dev = pmc->interface;
1737 /* no more filters for this source */
1739 psf_prev->sf_next = psf->sf_next;
1741 pmc->sources = psf->sf_next;
1742 #ifdef CONFIG_IP_MULTICAST
1743 if (psf->sf_oldin &&
1744 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1745 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1746 psf->sf_next = pmc->tomb;
1756 #ifndef CONFIG_IP_MULTICAST
1757 #define igmp_ifc_event(x) do { } while (0)
1760 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1761 int sfcount, __be32 *psfsrc, int delta)
1763 struct ip_mc_list *pmc;
1770 for_each_pmc_rcu(in_dev, pmc) {
1771 if (*pmca == pmc->multiaddr)
1775 /* MCA not found?? bug */
1779 spin_lock_bh(&pmc->lock);
1781 #ifdef CONFIG_IP_MULTICAST
1786 if (!pmc->sfcount[sfmode])
1788 pmc->sfcount[sfmode]--;
1791 for (i = 0; i < sfcount; i++) {
1792 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1794 changerec |= rv > 0;
1798 if (pmc->sfmode == MCAST_EXCLUDE &&
1799 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1800 pmc->sfcount[MCAST_INCLUDE]) {
1801 #ifdef CONFIG_IP_MULTICAST
1802 struct ip_sf_list *psf;
1805 /* filter mode change */
1806 pmc->sfmode = MCAST_INCLUDE;
1807 #ifdef CONFIG_IP_MULTICAST
1808 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1809 in_dev->mr_ifc_count = pmc->crcount;
1810 for (psf = pmc->sources; psf; psf = psf->sf_next)
1811 psf->sf_crcount = 0;
1812 igmp_ifc_event(pmc->interface);
1813 } else if (sf_setstate(pmc) || changerec) {
1814 igmp_ifc_event(pmc->interface);
1818 spin_unlock_bh(&pmc->lock);
1823 * Add multicast single-source filter to the interface list
1825 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1828 struct ip_sf_list *psf, *psf_prev;
1831 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1832 if (psf->sf_inaddr == *psfsrc)
1837 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1840 psf->sf_inaddr = *psfsrc;
1842 psf_prev->sf_next = psf;
1846 psf->sf_count[sfmode]++;
1847 if (psf->sf_count[sfmode] == 1) {
1848 ip_rt_multicast_event(pmc->interface);
1853 #ifdef CONFIG_IP_MULTICAST
1854 static void sf_markstate(struct ip_mc_list *pmc)
1856 struct ip_sf_list *psf;
1857 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1859 for (psf = pmc->sources; psf; psf = psf->sf_next)
1860 if (pmc->sfcount[MCAST_EXCLUDE]) {
1861 psf->sf_oldin = mca_xcount ==
1862 psf->sf_count[MCAST_EXCLUDE] &&
1863 !psf->sf_count[MCAST_INCLUDE];
1865 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1868 static int sf_setstate(struct ip_mc_list *pmc)
1870 struct ip_sf_list *psf, *dpsf;
1871 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1872 int qrv = pmc->interface->mr_qrv;
1876 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1877 if (pmc->sfcount[MCAST_EXCLUDE]) {
1878 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1879 !psf->sf_count[MCAST_INCLUDE];
1881 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1883 if (!psf->sf_oldin) {
1884 struct ip_sf_list *prev = NULL;
1886 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1887 if (dpsf->sf_inaddr == psf->sf_inaddr)
1893 prev->sf_next = dpsf->sf_next;
1895 pmc->tomb = dpsf->sf_next;
1898 psf->sf_crcount = qrv;
1901 } else if (psf->sf_oldin) {
1903 psf->sf_crcount = 0;
1905 * add or update "delete" records if an active filter
1908 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1909 if (dpsf->sf_inaddr == psf->sf_inaddr)
1912 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1916 /* pmc->lock held by callers */
1917 dpsf->sf_next = pmc->tomb;
1920 dpsf->sf_crcount = qrv;
1929 * Add multicast source filter list to the interface list
1931 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1932 int sfcount, __be32 *psfsrc, int delta)
1934 struct ip_mc_list *pmc;
1941 for_each_pmc_rcu(in_dev, pmc) {
1942 if (*pmca == pmc->multiaddr)
1946 /* MCA not found?? bug */
1950 spin_lock_bh(&pmc->lock);
1953 #ifdef CONFIG_IP_MULTICAST
1956 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1958 pmc->sfcount[sfmode]++;
1960 for (i = 0; i < sfcount; i++) {
1961 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1969 pmc->sfcount[sfmode]--;
1970 for (j = 0; j < i; j++)
1971 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1972 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1973 #ifdef CONFIG_IP_MULTICAST
1974 struct ip_sf_list *psf;
1975 in_dev = pmc->interface;
1978 /* filter mode change */
1979 if (pmc->sfcount[MCAST_EXCLUDE])
1980 pmc->sfmode = MCAST_EXCLUDE;
1981 else if (pmc->sfcount[MCAST_INCLUDE])
1982 pmc->sfmode = MCAST_INCLUDE;
1983 #ifdef CONFIG_IP_MULTICAST
1984 /* else no filters; keep old mode for reports */
1986 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1987 in_dev->mr_ifc_count = pmc->crcount;
1988 for (psf = pmc->sources; psf; psf = psf->sf_next)
1989 psf->sf_crcount = 0;
1990 igmp_ifc_event(in_dev);
1991 } else if (sf_setstate(pmc)) {
1992 igmp_ifc_event(in_dev);
1995 spin_unlock_bh(&pmc->lock);
1999 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2001 struct ip_sf_list *psf, *nextpsf;
2003 for (psf = pmc->tomb; psf; psf = nextpsf) {
2004 nextpsf = psf->sf_next;
2008 for (psf = pmc->sources; psf; psf = nextpsf) {
2009 nextpsf = psf->sf_next;
2012 pmc->sources = NULL;
2013 pmc->sfmode = MCAST_EXCLUDE;
2014 pmc->sfcount[MCAST_INCLUDE] = 0;
2015 pmc->sfcount[MCAST_EXCLUDE] = 1;
2018 /* Join a multicast group
2021 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2023 __be32 addr = imr->imr_multiaddr.s_addr;
2024 struct ip_mc_socklist *iml, *i;
2025 struct in_device *in_dev;
2026 struct inet_sock *inet = inet_sk(sk);
2027 struct net *net = sock_net(sk);
2034 if (!ipv4_is_multicast(addr))
2037 in_dev = ip_mc_find_dev(net, imr);
2045 ifindex = imr->imr_ifindex;
2046 for_each_pmc_rtnl(inet, i) {
2047 if (i->multi.imr_multiaddr.s_addr == addr &&
2048 i->multi.imr_ifindex == ifindex)
2053 if (count >= sysctl_igmp_max_memberships)
2055 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2059 memcpy(&iml->multi, imr, sizeof(*imr));
2060 iml->next_rcu = inet->mc_list;
2062 iml->sfmode = MCAST_EXCLUDE;
2063 rcu_assign_pointer(inet->mc_list, iml);
2064 ip_mc_inc_group(in_dev, addr);
2069 EXPORT_SYMBOL(ip_mc_join_group);
2071 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2072 struct in_device *in_dev)
2074 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2078 /* any-source empty exclude case */
2079 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2080 iml->sfmode, 0, NULL, 0);
2082 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2083 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2084 RCU_INIT_POINTER(iml->sflist, NULL);
2085 /* decrease mem now to avoid the memleak warning */
2086 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2087 kfree_rcu(psf, rcu);
2091 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2093 struct inet_sock *inet = inet_sk(sk);
2094 struct ip_mc_socklist *iml;
2095 struct ip_mc_socklist __rcu **imlp;
2096 struct in_device *in_dev;
2097 struct net *net = sock_net(sk);
2098 __be32 group = imr->imr_multiaddr.s_addr;
2100 int ret = -EADDRNOTAVAIL;
2104 in_dev = ip_mc_find_dev(net, imr);
2109 ifindex = imr->imr_ifindex;
2110 for (imlp = &inet->mc_list;
2111 (iml = rtnl_dereference(*imlp)) != NULL;
2112 imlp = &iml->next_rcu) {
2113 if (iml->multi.imr_multiaddr.s_addr != group)
2116 if (iml->multi.imr_ifindex != ifindex)
2118 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2119 iml->multi.imr_address.s_addr)
2122 (void) ip_mc_leave_src(sk, iml, in_dev);
2124 *imlp = iml->next_rcu;
2126 ip_mc_dec_group(in_dev, group);
2128 /* decrease mem now to avoid the memleak warning */
2129 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2130 kfree_rcu(iml, rcu);
2136 EXPORT_SYMBOL(ip_mc_leave_group);
2138 int ip_mc_source(int add, int omode, struct sock *sk, struct
2139 ip_mreq_source *mreqs, int ifindex)
2142 struct ip_mreqn imr;
2143 __be32 addr = mreqs->imr_multiaddr;
2144 struct ip_mc_socklist *pmc;
2145 struct in_device *in_dev = NULL;
2146 struct inet_sock *inet = inet_sk(sk);
2147 struct ip_sf_socklist *psl;
2148 struct net *net = sock_net(sk);
2152 if (!ipv4_is_multicast(addr))
2157 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2158 imr.imr_address.s_addr = mreqs->imr_interface;
2159 imr.imr_ifindex = ifindex;
2160 in_dev = ip_mc_find_dev(net, &imr);
2166 err = -EADDRNOTAVAIL;
2168 for_each_pmc_rtnl(inet, pmc) {
2169 if ((pmc->multi.imr_multiaddr.s_addr ==
2170 imr.imr_multiaddr.s_addr) &&
2171 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2174 if (!pmc) { /* must have a prior join */
2178 /* if a source filter was set, must be the same mode as before */
2180 if (pmc->sfmode != omode) {
2184 } else if (pmc->sfmode != omode) {
2185 /* allow mode switches for empty-set filters */
2186 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2187 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2189 pmc->sfmode = omode;
2192 psl = rtnl_dereference(pmc->sflist);
2195 goto done; /* err = -EADDRNOTAVAIL */
2197 for (i = 0; i < psl->sl_count; i++) {
2198 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2203 if (rv) /* source not found */
2204 goto done; /* err = -EADDRNOTAVAIL */
2206 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2207 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2212 /* update the interface filter */
2213 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2214 &mreqs->imr_sourceaddr, 1);
2216 for (j = i+1; j < psl->sl_count; j++)
2217 psl->sl_addr[j-1] = psl->sl_addr[j];
2222 /* else, add a new source to the filter */
2224 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2228 if (!psl || psl->sl_count == psl->sl_max) {
2229 struct ip_sf_socklist *newpsl;
2230 int count = IP_SFBLOCK;
2233 count += psl->sl_max;
2234 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2239 newpsl->sl_max = count;
2240 newpsl->sl_count = count - IP_SFBLOCK;
2242 for (i = 0; i < psl->sl_count; i++)
2243 newpsl->sl_addr[i] = psl->sl_addr[i];
2244 /* decrease mem now to avoid the memleak warning */
2245 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2246 kfree_rcu(psl, rcu);
2248 rcu_assign_pointer(pmc->sflist, newpsl);
2251 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2252 for (i = 0; i < psl->sl_count; i++) {
2253 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2258 if (rv == 0) /* address already there is an error */
2260 for (j = psl->sl_count-1; j >= i; j--)
2261 psl->sl_addr[j+1] = psl->sl_addr[j];
2262 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2265 /* update the interface list */
2266 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2267 &mreqs->imr_sourceaddr, 1);
2270 err = ip_mc_leave_group(sk, &imr);
2274 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2277 struct ip_mreqn imr;
2278 __be32 addr = msf->imsf_multiaddr;
2279 struct ip_mc_socklist *pmc;
2280 struct in_device *in_dev;
2281 struct inet_sock *inet = inet_sk(sk);
2282 struct ip_sf_socklist *newpsl, *psl;
2283 struct net *net = sock_net(sk);
2286 if (!ipv4_is_multicast(addr))
2288 if (msf->imsf_fmode != MCAST_INCLUDE &&
2289 msf->imsf_fmode != MCAST_EXCLUDE)
2294 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2295 imr.imr_address.s_addr = msf->imsf_interface;
2296 imr.imr_ifindex = ifindex;
2297 in_dev = ip_mc_find_dev(net, &imr);
2304 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2305 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2310 for_each_pmc_rtnl(inet, pmc) {
2311 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2312 pmc->multi.imr_ifindex == imr.imr_ifindex)
2315 if (!pmc) { /* must have a prior join */
2319 if (msf->imsf_numsrc) {
2320 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2326 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2327 memcpy(newpsl->sl_addr, msf->imsf_slist,
2328 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2329 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2330 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2332 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2337 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2338 msf->imsf_fmode, 0, NULL, 0);
2340 psl = rtnl_dereference(pmc->sflist);
2342 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2343 psl->sl_count, psl->sl_addr, 0);
2344 /* decrease mem now to avoid the memleak warning */
2345 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2346 kfree_rcu(psl, rcu);
2348 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2350 rcu_assign_pointer(pmc->sflist, newpsl);
2351 pmc->sfmode = msf->imsf_fmode;
2355 err = ip_mc_leave_group(sk, &imr);
2359 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2360 struct ip_msfilter __user *optval, int __user *optlen)
2362 int err, len, count, copycount;
2363 struct ip_mreqn imr;
2364 __be32 addr = msf->imsf_multiaddr;
2365 struct ip_mc_socklist *pmc;
2366 struct in_device *in_dev;
2367 struct inet_sock *inet = inet_sk(sk);
2368 struct ip_sf_socklist *psl;
2369 struct net *net = sock_net(sk);
2371 if (!ipv4_is_multicast(addr))
2376 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2377 imr.imr_address.s_addr = msf->imsf_interface;
2378 imr.imr_ifindex = 0;
2379 in_dev = ip_mc_find_dev(net, &imr);
2385 err = -EADDRNOTAVAIL;
2387 for_each_pmc_rtnl(inet, pmc) {
2388 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2389 pmc->multi.imr_ifindex == imr.imr_ifindex)
2392 if (!pmc) /* must have a prior join */
2394 msf->imsf_fmode = pmc->sfmode;
2395 psl = rtnl_dereference(pmc->sflist);
2401 count = psl->sl_count;
2403 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2404 len = copycount * sizeof(psl->sl_addr[0]);
2405 msf->imsf_numsrc = count;
2406 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2407 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2411 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2419 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2420 struct group_filter __user *optval, int __user *optlen)
2422 int err, i, count, copycount;
2423 struct sockaddr_in *psin;
2425 struct ip_mc_socklist *pmc;
2426 struct inet_sock *inet = inet_sk(sk);
2427 struct ip_sf_socklist *psl;
2429 psin = (struct sockaddr_in *)&gsf->gf_group;
2430 if (psin->sin_family != AF_INET)
2432 addr = psin->sin_addr.s_addr;
2433 if (!ipv4_is_multicast(addr))
2438 err = -EADDRNOTAVAIL;
2440 for_each_pmc_rtnl(inet, pmc) {
2441 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2442 pmc->multi.imr_ifindex == gsf->gf_interface)
2445 if (!pmc) /* must have a prior join */
2447 gsf->gf_fmode = pmc->sfmode;
2448 psl = rtnl_dereference(pmc->sflist);
2450 count = psl ? psl->sl_count : 0;
2451 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2452 gsf->gf_numsrc = count;
2453 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2454 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2457 for (i = 0; i < copycount; i++) {
2458 struct sockaddr_storage ss;
2460 psin = (struct sockaddr_in *)&ss;
2461 memset(&ss, 0, sizeof(ss));
2462 psin->sin_family = AF_INET;
2463 psin->sin_addr.s_addr = psl->sl_addr[i];
2464 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2474 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2476 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2478 struct inet_sock *inet = inet_sk(sk);
2479 struct ip_mc_socklist *pmc;
2480 struct ip_sf_socklist *psl;
2485 if (!ipv4_is_multicast(loc_addr))
2489 for_each_pmc_rcu(inet, pmc) {
2490 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2491 pmc->multi.imr_ifindex == dif)
2497 psl = rcu_dereference(pmc->sflist);
2498 ret = (pmc->sfmode == MCAST_EXCLUDE);
2502 for (i = 0; i < psl->sl_count; i++) {
2503 if (psl->sl_addr[i] == rmt_addr)
2507 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2509 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2519 * A socket is closing.
2522 void ip_mc_drop_socket(struct sock *sk)
2524 struct inet_sock *inet = inet_sk(sk);
2525 struct ip_mc_socklist *iml;
2526 struct net *net = sock_net(sk);
2532 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2533 struct in_device *in_dev;
2535 inet->mc_list = iml->next_rcu;
2536 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2537 (void) ip_mc_leave_src(sk, iml, in_dev);
2539 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2540 /* decrease mem now to avoid the memleak warning */
2541 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2542 kfree_rcu(iml, rcu);
2547 /* called with rcu_read_lock() */
2548 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2550 struct ip_mc_list *im;
2551 struct ip_mc_list __rcu **mc_hash;
2552 struct ip_sf_list *psf;
2555 mc_hash = rcu_dereference(in_dev->mc_hash);
2557 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2559 for (im = rcu_dereference(mc_hash[hash]);
2561 im = rcu_dereference(im->next_hash)) {
2562 if (im->multiaddr == mc_addr)
2566 for_each_pmc_rcu(in_dev, im) {
2567 if (im->multiaddr == mc_addr)
2571 if (im && proto == IPPROTO_IGMP) {
2575 for (psf = im->sources; psf; psf = psf->sf_next) {
2576 if (psf->sf_inaddr == src_addr)
2580 rv = psf->sf_count[MCAST_INCLUDE] ||
2581 psf->sf_count[MCAST_EXCLUDE] !=
2582 im->sfcount[MCAST_EXCLUDE];
2584 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2586 rv = 1; /* unspecified source; tentatively allow */
2591 #if defined(CONFIG_PROC_FS)
2592 struct igmp_mc_iter_state {
2593 struct seq_net_private p;
2594 struct net_device *dev;
2595 struct in_device *in_dev;
2598 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2600 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2602 struct net *net = seq_file_net(seq);
2603 struct ip_mc_list *im = NULL;
2604 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2606 state->in_dev = NULL;
2607 for_each_netdev_rcu(net, state->dev) {
2608 struct in_device *in_dev;
2610 in_dev = __in_dev_get_rcu(state->dev);
2613 im = rcu_dereference(in_dev->mc_list);
2615 state->in_dev = in_dev;
2622 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2624 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2626 im = rcu_dereference(im->next_rcu);
2628 state->dev = next_net_device_rcu(state->dev);
2630 state->in_dev = NULL;
2633 state->in_dev = __in_dev_get_rcu(state->dev);
2636 im = rcu_dereference(state->in_dev->mc_list);
2641 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2643 struct ip_mc_list *im = igmp_mc_get_first(seq);
2645 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2647 return pos ? NULL : im;
2650 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2654 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2657 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2659 struct ip_mc_list *im;
2660 if (v == SEQ_START_TOKEN)
2661 im = igmp_mc_get_first(seq);
2663 im = igmp_mc_get_next(seq, v);
2668 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2671 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2673 state->in_dev = NULL;
2678 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2680 if (v == SEQ_START_TOKEN)
2682 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2684 struct ip_mc_list *im = (struct ip_mc_list *)v;
2685 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2689 #ifdef CONFIG_IP_MULTICAST
2690 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2691 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2697 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2698 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2699 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2702 delta = im->timer.expires - jiffies;
2704 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2705 im->multiaddr, im->users,
2707 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2713 static const struct seq_operations igmp_mc_seq_ops = {
2714 .start = igmp_mc_seq_start,
2715 .next = igmp_mc_seq_next,
2716 .stop = igmp_mc_seq_stop,
2717 .show = igmp_mc_seq_show,
2720 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2722 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2723 sizeof(struct igmp_mc_iter_state));
2726 static const struct file_operations igmp_mc_seq_fops = {
2727 .owner = THIS_MODULE,
2728 .open = igmp_mc_seq_open,
2730 .llseek = seq_lseek,
2731 .release = seq_release_net,
2734 struct igmp_mcf_iter_state {
2735 struct seq_net_private p;
2736 struct net_device *dev;
2737 struct in_device *idev;
2738 struct ip_mc_list *im;
2741 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2743 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2745 struct net *net = seq_file_net(seq);
2746 struct ip_sf_list *psf = NULL;
2747 struct ip_mc_list *im = NULL;
2748 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2752 for_each_netdev_rcu(net, state->dev) {
2753 struct in_device *idev;
2754 idev = __in_dev_get_rcu(state->dev);
2755 if (unlikely(!idev))
2757 im = rcu_dereference(idev->mc_list);
2759 spin_lock_bh(&im->lock);
2766 spin_unlock_bh(&im->lock);
2772 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2774 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2778 spin_unlock_bh(&state->im->lock);
2779 state->im = state->im->next;
2780 while (!state->im) {
2781 state->dev = next_net_device_rcu(state->dev);
2786 state->idev = __in_dev_get_rcu(state->dev);
2789 state->im = rcu_dereference(state->idev->mc_list);
2793 spin_lock_bh(&state->im->lock);
2794 psf = state->im->sources;
2800 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2802 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2804 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2806 return pos ? NULL : psf;
2809 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2813 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2816 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2818 struct ip_sf_list *psf;
2819 if (v == SEQ_START_TOKEN)
2820 psf = igmp_mcf_get_first(seq);
2822 psf = igmp_mcf_get_next(seq, v);
2827 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2830 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2831 if (likely(state->im)) {
2832 spin_unlock_bh(&state->im->lock);
2840 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2842 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2843 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2845 if (v == SEQ_START_TOKEN) {
2846 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2850 "0x%08x %6lu %6lu\n",
2851 state->dev->ifindex, state->dev->name,
2852 ntohl(state->im->multiaddr),
2853 ntohl(psf->sf_inaddr),
2854 psf->sf_count[MCAST_INCLUDE],
2855 psf->sf_count[MCAST_EXCLUDE]);
2860 static const struct seq_operations igmp_mcf_seq_ops = {
2861 .start = igmp_mcf_seq_start,
2862 .next = igmp_mcf_seq_next,
2863 .stop = igmp_mcf_seq_stop,
2864 .show = igmp_mcf_seq_show,
2867 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2869 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2870 sizeof(struct igmp_mcf_iter_state));
2873 static const struct file_operations igmp_mcf_seq_fops = {
2874 .owner = THIS_MODULE,
2875 .open = igmp_mcf_seq_open,
2877 .llseek = seq_lseek,
2878 .release = seq_release_net,
2881 static int __net_init igmp_net_init(struct net *net)
2883 struct proc_dir_entry *pde;
2886 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2889 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2890 &igmp_mcf_seq_fops);
2893 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2894 SOCK_DGRAM, 0, net);
2896 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2904 remove_proc_entry("mcfilter", net->proc_net);
2906 remove_proc_entry("igmp", net->proc_net);
2911 static void __net_exit igmp_net_exit(struct net *net)
2913 remove_proc_entry("mcfilter", net->proc_net);
2914 remove_proc_entry("igmp", net->proc_net);
2915 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2918 static struct pernet_operations igmp_net_ops = {
2919 .init = igmp_net_init,
2920 .exit = igmp_net_exit,
2924 static int igmp_netdev_event(struct notifier_block *this,
2925 unsigned long event, void *ptr)
2927 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2928 struct in_device *in_dev;
2931 case NETDEV_RESEND_IGMP:
2932 in_dev = __in_dev_get_rtnl(dev);
2934 ip_mc_rejoin_groups(in_dev);
2942 static struct notifier_block igmp_notifier = {
2943 .notifier_call = igmp_netdev_event,
2946 int __init igmp_mc_init(void)
2948 #if defined(CONFIG_PROC_FS)
2951 err = register_pernet_subsys(&igmp_net_ops);
2954 err = register_netdevice_notifier(&igmp_notifier);
2956 goto reg_notif_fail;
2960 unregister_pernet_subsys(&igmp_net_ops);
2963 return register_netdevice_notifier(&igmp_notifier);