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.
11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
14 * Alan Cox <Alan.Cox@linux.org>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 * David L Stevens: IGMPv3 support, with help from
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
99 #include <net/checksum.h>
100 #include <linux/netfilter_ipv4.h>
101 #ifdef CONFIG_IP_MROUTE
102 #include <linux/mroute.h>
104 #ifdef CONFIG_PROC_FS
105 #include <linux/proc_fs.h>
106 #include <linux/seq_file.h>
109 #define IP_MAX_MEMBERSHIPS 20
110 #define IP_MAX_MSF 10
112 #ifdef CONFIG_IP_MULTICAST
113 /* Parameter names and values are taken from igmp-v2-06 draft */
115 #define IGMP_V1_Router_Present_Timeout (400*HZ)
116 #define IGMP_V2_Router_Present_Timeout (400*HZ)
117 #define IGMP_Unsolicited_Report_Interval (10*HZ)
118 #define IGMP_Query_Response_Interval (10*HZ)
119 #define IGMP_Unsolicited_Report_Count 2
122 #define IGMP_Initial_Report_Delay (1)
124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
131 #define IGMP_V1_SEEN(in_dev) \
132 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 1 || \
133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136 #define IGMP_V2_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(FORCE_IGMP_VERSION) == 2 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139 ((in_dev)->mr_v2_seen && \
140 time_before(jiffies, (in_dev)->mr_v2_seen)))
142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
144 static void igmpv3_clear_delrec(struct in_device *in_dev);
145 static int sf_setstate(struct ip_mc_list *pmc);
146 static void sf_markstate(struct ip_mc_list *pmc);
148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150 int sfcount, __be32 *psfsrc, int delta);
152 static void ip_ma_put(struct ip_mc_list *im)
154 if (atomic_dec_and_test(&im->refcnt)) {
155 in_dev_put(im->interface);
160 #ifdef CONFIG_IP_MULTICAST
166 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168 spin_lock_bh(&im->lock);
169 if (del_timer(&im->timer))
170 atomic_dec(&im->refcnt);
173 im->unsolicit_count = 0;
174 spin_unlock_bh(&im->lock);
177 /* It must be called with locked im->lock */
178 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180 int tv=net_random() % max_delay;
183 if (!mod_timer(&im->timer, jiffies+tv+2))
184 atomic_inc(&im->refcnt);
187 static void igmp_gq_start_timer(struct in_device *in_dev)
189 int tv = net_random() % in_dev->mr_maxdelay;
191 in_dev->mr_gq_running = 1;
192 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
196 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198 int tv = net_random() % delay;
200 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
204 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206 spin_lock_bh(&im->lock);
207 im->unsolicit_count = 0;
208 if (del_timer(&im->timer)) {
209 if ((long)(im->timer.expires-jiffies) < max_delay) {
210 add_timer(&im->timer);
212 spin_unlock_bh(&im->lock);
215 atomic_dec(&im->refcnt);
217 igmp_start_timer(im, max_delay);
218 spin_unlock_bh(&im->lock);
223 * Send an IGMP report.
226 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
229 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
230 int gdeleted, int sdeleted)
233 case IGMPV3_MODE_IS_INCLUDE:
234 case IGMPV3_MODE_IS_EXCLUDE:
235 if (gdeleted || sdeleted)
237 if (!(pmc->gsquery && !psf->sf_gsresp)) {
238 if (pmc->sfmode == MCAST_INCLUDE)
240 /* don't include if this source is excluded
243 if (psf->sf_count[MCAST_INCLUDE])
244 return type == IGMPV3_MODE_IS_INCLUDE;
245 return pmc->sfcount[MCAST_EXCLUDE] ==
246 psf->sf_count[MCAST_EXCLUDE];
249 case IGMPV3_CHANGE_TO_INCLUDE:
250 if (gdeleted || sdeleted)
252 return psf->sf_count[MCAST_INCLUDE] != 0;
253 case IGMPV3_CHANGE_TO_EXCLUDE:
254 if (gdeleted || sdeleted)
256 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
257 psf->sf_count[MCAST_INCLUDE])
259 return pmc->sfcount[MCAST_EXCLUDE] ==
260 psf->sf_count[MCAST_EXCLUDE];
261 case IGMPV3_ALLOW_NEW_SOURCES:
262 if (gdeleted || !psf->sf_crcount)
264 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
265 case IGMPV3_BLOCK_OLD_SOURCES:
266 if (pmc->sfmode == MCAST_INCLUDE)
267 return gdeleted || (psf->sf_crcount && sdeleted);
268 return psf->sf_crcount && !gdeleted && !sdeleted;
274 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276 struct ip_sf_list *psf;
279 for (psf=pmc->sources; psf; psf=psf->sf_next) {
280 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
287 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
292 struct igmpv3_report *pig;
294 skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
299 struct flowi fl = { .oif = dev->ifindex,
301 .daddr = IGMPV3_ALL_MCR } },
302 .proto = IPPROTO_IGMP };
303 if (ip_route_output_key(&rt, &fl)) {
308 if (rt->rt_src == 0) {
314 skb->dst = &rt->u.dst;
317 skb_reserve(skb, LL_RESERVED_SPACE(dev));
319 skb_reset_network_header(skb);
321 skb_put(skb, sizeof(struct iphdr) + 4);
324 pip->ihl = (sizeof(struct iphdr)+4)>>2;
326 pip->frag_off = htons(IP_DF);
328 pip->daddr = rt->rt_dst;
329 pip->saddr = rt->rt_src;
330 pip->protocol = IPPROTO_IGMP;
331 pip->tot_len = 0; /* filled in later */
332 ip_select_ident(pip, &rt->u.dst, NULL);
333 ((u8*)&pip[1])[0] = IPOPT_RA;
334 ((u8*)&pip[1])[1] = 4;
335 ((u8*)&pip[1])[2] = 0;
336 ((u8*)&pip[1])[3] = 0;
338 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
339 skb_put(skb, sizeof(*pig));
340 pig = igmpv3_report_hdr(skb);
341 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
349 static int igmpv3_sendpack(struct sk_buff *skb)
351 struct iphdr *pip = ip_hdr(skb);
352 struct igmphdr *pig = igmp_hdr(skb);
353 const int iplen = skb->tail - skb->network_header;
354 const int igmplen = skb->tail - skb->transport_header;
356 pip->tot_len = htons(iplen);
358 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
360 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
364 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
366 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
369 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
370 int type, struct igmpv3_grec **ppgr)
372 struct net_device *dev = pmc->interface->dev;
373 struct igmpv3_report *pih;
374 struct igmpv3_grec *pgr;
377 skb = igmpv3_newpack(dev, dev->mtu);
380 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
381 pgr->grec_type = type;
382 pgr->grec_auxwords = 0;
384 pgr->grec_mca = pmc->multiaddr;
385 pih = igmpv3_report_hdr(skb);
386 pih->ngrec = htons(ntohs(pih->ngrec)+1);
391 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
392 skb_tailroom(skb)) : 0)
394 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
395 int type, int gdeleted, int sdeleted)
397 struct net_device *dev = pmc->interface->dev;
398 struct igmpv3_report *pih;
399 struct igmpv3_grec *pgr = NULL;
400 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
401 int scount, stotal, first, isquery, truncate;
403 if (pmc->multiaddr == IGMP_ALL_HOSTS)
406 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
407 type == IGMPV3_MODE_IS_EXCLUDE;
408 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
409 type == IGMPV3_CHANGE_TO_EXCLUDE;
413 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
418 pih = skb ? igmpv3_report_hdr(skb) : NULL;
420 /* EX and TO_EX get a fresh packet, if needed */
422 if (pih && pih->ngrec &&
423 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
425 igmpv3_sendpack(skb);
426 skb = igmpv3_newpack(dev, dev->mtu);
431 for (psf=*psf_list; psf; psf=psf_next) {
434 psf_next = psf->sf_next;
436 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
441 /* clear marks on query responses */
445 if (AVAILABLE(skb) < sizeof(__be32) +
446 first*sizeof(struct igmpv3_grec)) {
447 if (truncate && !first)
448 break; /* truncate these */
450 pgr->grec_nsrcs = htons(scount);
452 igmpv3_sendpack(skb);
453 skb = igmpv3_newpack(dev, dev->mtu);
458 skb = add_grhead(skb, pmc, type, &pgr);
463 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
464 *psrc = psf->sf_inaddr;
466 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
467 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
469 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
471 psf_prev->sf_next = psf->sf_next;
473 *psf_list = psf->sf_next;
483 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
484 type == IGMPV3_BLOCK_OLD_SOURCES)
486 if (pmc->crcount || isquery) {
487 /* make sure we have room for group header */
488 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
489 igmpv3_sendpack(skb);
490 skb = NULL; /* add_grhead will get a new one */
492 skb = add_grhead(skb, pmc, type, &pgr);
496 pgr->grec_nsrcs = htons(scount);
499 pmc->gsquery = 0; /* clear query state on report */
503 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
505 struct sk_buff *skb = NULL;
509 read_lock(&in_dev->mc_list_lock);
510 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
511 if (pmc->multiaddr == IGMP_ALL_HOSTS)
513 spin_lock_bh(&pmc->lock);
514 if (pmc->sfcount[MCAST_EXCLUDE])
515 type = IGMPV3_MODE_IS_EXCLUDE;
517 type = IGMPV3_MODE_IS_INCLUDE;
518 skb = add_grec(skb, pmc, type, 0, 0);
519 spin_unlock_bh(&pmc->lock);
521 read_unlock(&in_dev->mc_list_lock);
523 spin_lock_bh(&pmc->lock);
524 if (pmc->sfcount[MCAST_EXCLUDE])
525 type = IGMPV3_MODE_IS_EXCLUDE;
527 type = IGMPV3_MODE_IS_INCLUDE;
528 skb = add_grec(skb, pmc, type, 0, 0);
529 spin_unlock_bh(&pmc->lock);
533 return igmpv3_sendpack(skb);
537 * remove zero-count source records from a source filter list
539 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
541 struct ip_sf_list *psf_prev, *psf_next, *psf;
544 for (psf=*ppsf; psf; psf = psf_next) {
545 psf_next = psf->sf_next;
546 if (psf->sf_crcount == 0) {
548 psf_prev->sf_next = psf->sf_next;
550 *ppsf = psf->sf_next;
557 static void igmpv3_send_cr(struct in_device *in_dev)
559 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
560 struct sk_buff *skb = NULL;
563 read_lock(&in_dev->mc_list_lock);
564 spin_lock_bh(&in_dev->mc_tomb_lock);
568 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
569 pmc_next = pmc->next;
570 if (pmc->sfmode == MCAST_INCLUDE) {
571 type = IGMPV3_BLOCK_OLD_SOURCES;
572 dtype = IGMPV3_BLOCK_OLD_SOURCES;
573 skb = add_grec(skb, pmc, type, 1, 0);
574 skb = add_grec(skb, pmc, dtype, 1, 1);
577 if (pmc->sfmode == MCAST_EXCLUDE) {
578 type = IGMPV3_CHANGE_TO_INCLUDE;
579 skb = add_grec(skb, pmc, type, 1, 0);
582 if (pmc->crcount == 0) {
583 igmpv3_clear_zeros(&pmc->tomb);
584 igmpv3_clear_zeros(&pmc->sources);
587 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
589 pmc_prev->next = pmc_next;
591 in_dev->mc_tomb = pmc_next;
592 in_dev_put(pmc->interface);
597 spin_unlock_bh(&in_dev->mc_tomb_lock);
600 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
601 spin_lock_bh(&pmc->lock);
602 if (pmc->sfcount[MCAST_EXCLUDE]) {
603 type = IGMPV3_BLOCK_OLD_SOURCES;
604 dtype = IGMPV3_ALLOW_NEW_SOURCES;
606 type = IGMPV3_ALLOW_NEW_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
609 skb = add_grec(skb, pmc, type, 0, 0);
610 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
612 /* filter mode changes */
614 if (pmc->sfmode == MCAST_EXCLUDE)
615 type = IGMPV3_CHANGE_TO_EXCLUDE;
617 type = IGMPV3_CHANGE_TO_INCLUDE;
618 skb = add_grec(skb, pmc, type, 0, 0);
621 spin_unlock_bh(&pmc->lock);
623 read_unlock(&in_dev->mc_list_lock);
627 (void) igmpv3_sendpack(skb);
630 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
637 struct net_device *dev = in_dev->dev;
638 __be32 group = pmc ? pmc->multiaddr : 0;
641 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
642 return igmpv3_send_report(in_dev, pmc);
643 else if (type == IGMP_HOST_LEAVE_MESSAGE)
644 dst = IGMP_ALL_ROUTER;
649 struct flowi fl = { .oif = dev->ifindex,
650 .nl_u = { .ip4_u = { .daddr = dst } },
651 .proto = IPPROTO_IGMP };
652 if (ip_route_output_key(&rt, &fl))
655 if (rt->rt_src == 0) {
660 skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
666 skb->dst = &rt->u.dst;
668 skb_reserve(skb, LL_RESERVED_SPACE(dev));
670 skb_reset_network_header(skb);
672 skb_put(skb, sizeof(struct iphdr) + 4);
675 iph->ihl = (sizeof(struct iphdr)+4)>>2;
677 iph->frag_off = htons(IP_DF);
680 iph->saddr = rt->rt_src;
681 iph->protocol = IPPROTO_IGMP;
682 iph->tot_len = htons(IGMP_SIZE);
683 ip_select_ident(iph, &rt->u.dst, NULL);
684 ((u8*)&iph[1])[0] = IPOPT_RA;
685 ((u8*)&iph[1])[1] = 4;
686 ((u8*)&iph[1])[2] = 0;
687 ((u8*)&iph[1])[3] = 0;
690 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
695 ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
697 return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
701 static void igmp_gq_timer_expire(unsigned long data)
703 struct in_device *in_dev = (struct in_device *)data;
705 in_dev->mr_gq_running = 0;
706 igmpv3_send_report(in_dev, NULL);
707 __in_dev_put(in_dev);
710 static void igmp_ifc_timer_expire(unsigned long data)
712 struct in_device *in_dev = (struct in_device *)data;
714 igmpv3_send_cr(in_dev);
715 if (in_dev->mr_ifc_count) {
716 in_dev->mr_ifc_count--;
717 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
719 __in_dev_put(in_dev);
722 static void igmp_ifc_event(struct in_device *in_dev)
724 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
726 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
727 IGMP_Unsolicited_Report_Count;
728 igmp_ifc_start_timer(in_dev, 1);
732 static void igmp_timer_expire(unsigned long data)
734 struct ip_mc_list *im=(struct ip_mc_list *)data;
735 struct in_device *in_dev = im->interface;
737 spin_lock(&im->lock);
740 if (im->unsolicit_count) {
741 im->unsolicit_count--;
742 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
745 spin_unlock(&im->lock);
747 if (IGMP_V1_SEEN(in_dev))
748 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
749 else if (IGMP_V2_SEEN(in_dev))
750 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
752 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
757 /* mark EXCLUDE-mode sources */
758 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
760 struct ip_sf_list *psf;
764 for (psf=pmc->sources; psf; psf=psf->sf_next) {
767 for (i=0; i<nsrcs; i++) {
768 /* skip inactive filters */
769 if (pmc->sfcount[MCAST_INCLUDE] ||
770 pmc->sfcount[MCAST_EXCLUDE] !=
771 psf->sf_count[MCAST_EXCLUDE])
773 if (srcs[i] == psf->sf_inaddr) {
780 if (scount == nsrcs) /* all sources excluded */
785 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
787 struct ip_sf_list *psf;
790 if (pmc->sfmode == MCAST_EXCLUDE)
791 return igmp_xmarksources(pmc, nsrcs, srcs);
793 /* mark INCLUDE-mode sources */
795 for (psf=pmc->sources; psf; psf=psf->sf_next) {
798 for (i=0; i<nsrcs; i++)
799 if (srcs[i] == psf->sf_inaddr) {
813 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
815 struct ip_mc_list *im;
817 /* Timers are only set for non-local groups */
819 if (group == IGMP_ALL_HOSTS)
822 read_lock(&in_dev->mc_list_lock);
823 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
824 if (im->multiaddr == group) {
829 read_unlock(&in_dev->mc_list_lock);
832 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
835 struct igmphdr *ih = igmp_hdr(skb);
836 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
837 struct ip_mc_list *im;
838 __be32 group = ih->group;
845 /* Alas, old v1 router presents here. */
847 max_delay = IGMP_Query_Response_Interval;
848 in_dev->mr_v1_seen = jiffies +
849 IGMP_V1_Router_Present_Timeout;
852 /* v2 router present */
853 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
854 in_dev->mr_v2_seen = jiffies +
855 IGMP_V2_Router_Present_Timeout;
857 /* cancel the interface change timer */
858 in_dev->mr_ifc_count = 0;
859 if (del_timer(&in_dev->mr_ifc_timer))
860 __in_dev_put(in_dev);
861 /* clear deleted report items */
862 igmpv3_clear_delrec(in_dev);
863 } else if (len < 12) {
864 return; /* ignore bogus packet; freed by caller */
866 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
869 ih3 = igmpv3_query_hdr(skb);
871 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
872 + ntohs(ih3->nsrcs)*sizeof(__be32)))
874 ih3 = igmpv3_query_hdr(skb);
877 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
879 max_delay = 1; /* can't mod w/ 0 */
880 in_dev->mr_maxdelay = max_delay;
882 in_dev->mr_qrv = ih3->qrv;
883 if (!group) { /* general query */
885 return; /* no sources allowed */
886 igmp_gq_start_timer(in_dev);
889 /* mark sources to include, if group & source-specific */
890 mark = ih3->nsrcs != 0;
894 * - Start the timers in all of our membership records
895 * that the query applies to for the interface on
896 * which the query arrived excl. those that belong
897 * to a "local" group (224.0.0.X)
898 * - For timers already running check if they need to
900 * - Use the igmp->igmp_code field as the maximum
903 read_lock(&in_dev->mc_list_lock);
904 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
907 if (group && group != im->multiaddr)
909 if (im->multiaddr == IGMP_ALL_HOSTS)
911 spin_lock_bh(&im->lock);
913 im->gsquery = im->gsquery && mark;
916 changed = !im->gsquery ||
917 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
918 spin_unlock_bh(&im->lock);
920 igmp_mod_timer(im, max_delay);
922 read_unlock(&in_dev->mc_list_lock);
925 int igmp_rcv(struct sk_buff *skb)
927 /* This basically follows the spec line by line -- see RFC1112 */
929 struct in_device *in_dev = in_dev_get(skb->dev);
937 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
940 switch (skb->ip_summed) {
941 case CHECKSUM_COMPLETE:
942 if (!csum_fold(skb->csum))
947 if (__skb_checksum_complete(skb))
953 case IGMP_HOST_MEMBERSHIP_QUERY:
954 igmp_heard_query(in_dev, skb, len);
956 case IGMP_HOST_MEMBERSHIP_REPORT:
957 case IGMPV2_HOST_MEMBERSHIP_REPORT:
958 case IGMPV3_HOST_MEMBERSHIP_REPORT:
959 /* Is it our report looped back? */
960 if (((struct rtable*)skb->dst)->fl.iif == 0)
962 /* don't rely on MC router hearing unicast reports */
963 if (skb->pkt_type == PACKET_MULTICAST ||
964 skb->pkt_type == PACKET_BROADCAST)
965 igmp_heard_report(in_dev, ih->group);
968 #ifdef CONFIG_IP_PIMSM_V1
970 return pim_rcv_v1(skb);
974 case IGMP_HOST_LEAVE_MESSAGE:
976 case IGMP_MTRACE_RESP:
992 * Add a filter to a device
995 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
997 char buf[MAX_ADDR_LEN];
998 struct net_device *dev = in_dev->dev;
1000 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1001 We will get multicast token leakage, when IFF_MULTICAST
1002 is changed. This check should be done in dev->set_multicast_list
1003 routine. Something sort of:
1004 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1007 if (arp_mc_map(addr, buf, dev, 0) == 0)
1008 dev_mc_add(dev,buf,dev->addr_len,0);
1012 * Remove a filter from a device
1015 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1017 char buf[MAX_ADDR_LEN];
1018 struct net_device *dev = in_dev->dev;
1020 if (arp_mc_map(addr, buf, dev, 0) == 0)
1021 dev_mc_delete(dev,buf,dev->addr_len,0);
1024 #ifdef CONFIG_IP_MULTICAST
1026 * deleted ip_mc_list manipulation
1028 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1030 struct ip_mc_list *pmc;
1032 /* this is an "ip_mc_list" for convenience; only the fields below
1033 * are actually used. In particular, the refcnt and users are not
1034 * used for management of the delete list. Using the same structure
1035 * for deleted items allows change reports to use common code with
1036 * non-deleted or query-response MCA's.
1038 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1041 spin_lock_bh(&im->lock);
1042 pmc->interface = im->interface;
1043 in_dev_hold(in_dev);
1044 pmc->multiaddr = im->multiaddr;
1045 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1046 IGMP_Unsolicited_Report_Count;
1047 pmc->sfmode = im->sfmode;
1048 if (pmc->sfmode == MCAST_INCLUDE) {
1049 struct ip_sf_list *psf;
1051 pmc->tomb = im->tomb;
1052 pmc->sources = im->sources;
1053 im->tomb = im->sources = NULL;
1054 for (psf=pmc->sources; psf; psf=psf->sf_next)
1055 psf->sf_crcount = pmc->crcount;
1057 spin_unlock_bh(&im->lock);
1059 spin_lock_bh(&in_dev->mc_tomb_lock);
1060 pmc->next = in_dev->mc_tomb;
1061 in_dev->mc_tomb = pmc;
1062 spin_unlock_bh(&in_dev->mc_tomb_lock);
1065 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1067 struct ip_mc_list *pmc, *pmc_prev;
1068 struct ip_sf_list *psf, *psf_next;
1070 spin_lock_bh(&in_dev->mc_tomb_lock);
1072 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1073 if (pmc->multiaddr == multiaddr)
1079 pmc_prev->next = pmc->next;
1081 in_dev->mc_tomb = pmc->next;
1083 spin_unlock_bh(&in_dev->mc_tomb_lock);
1085 for (psf=pmc->tomb; psf; psf=psf_next) {
1086 psf_next = psf->sf_next;
1089 in_dev_put(pmc->interface);
1094 static void igmpv3_clear_delrec(struct in_device *in_dev)
1096 struct ip_mc_list *pmc, *nextpmc;
1098 spin_lock_bh(&in_dev->mc_tomb_lock);
1099 pmc = in_dev->mc_tomb;
1100 in_dev->mc_tomb = NULL;
1101 spin_unlock_bh(&in_dev->mc_tomb_lock);
1103 for (; pmc; pmc = nextpmc) {
1104 nextpmc = pmc->next;
1105 ip_mc_clear_src(pmc);
1106 in_dev_put(pmc->interface);
1109 /* clear dead sources, too */
1110 read_lock(&in_dev->mc_list_lock);
1111 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1112 struct ip_sf_list *psf, *psf_next;
1114 spin_lock_bh(&pmc->lock);
1117 spin_unlock_bh(&pmc->lock);
1118 for (; psf; psf=psf_next) {
1119 psf_next = psf->sf_next;
1123 read_unlock(&in_dev->mc_list_lock);
1127 static void igmp_group_dropped(struct ip_mc_list *im)
1129 struct in_device *in_dev = im->interface;
1130 #ifdef CONFIG_IP_MULTICAST
1136 ip_mc_filter_del(in_dev, im->multiaddr);
1139 #ifdef CONFIG_IP_MULTICAST
1140 if (im->multiaddr == IGMP_ALL_HOSTS)
1143 reporter = im->reporter;
1144 igmp_stop_timer(im);
1146 if (!in_dev->dead) {
1147 if (IGMP_V1_SEEN(in_dev))
1149 if (IGMP_V2_SEEN(in_dev)) {
1151 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1155 igmpv3_add_delrec(in_dev, im);
1157 igmp_ifc_event(in_dev);
1161 ip_mc_clear_src(im);
1164 static void igmp_group_added(struct ip_mc_list *im)
1166 struct in_device *in_dev = im->interface;
1168 if (im->loaded == 0) {
1170 ip_mc_filter_add(in_dev, im->multiaddr);
1173 #ifdef CONFIG_IP_MULTICAST
1174 if (im->multiaddr == IGMP_ALL_HOSTS)
1179 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1180 spin_lock_bh(&im->lock);
1181 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1182 spin_unlock_bh(&im->lock);
1187 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1188 IGMP_Unsolicited_Report_Count;
1189 igmp_ifc_event(in_dev);
1195 * Multicast list managers
1200 * A socket has joined a multicast group on device dev.
1203 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1205 struct ip_mc_list *im;
1209 for (im=in_dev->mc_list; im; im=im->next) {
1210 if (im->multiaddr == addr) {
1212 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1217 im = kmalloc(sizeof(*im), GFP_KERNEL);
1222 im->interface=in_dev;
1223 in_dev_hold(in_dev);
1225 /* initial mode is (EX, empty) */
1226 im->sfmode = MCAST_EXCLUDE;
1227 im->sfcount[MCAST_INCLUDE] = 0;
1228 im->sfcount[MCAST_EXCLUDE] = 1;
1232 atomic_set(&im->refcnt, 1);
1233 spin_lock_init(&im->lock);
1234 #ifdef CONFIG_IP_MULTICAST
1236 init_timer(&im->timer);
1237 im->timer.data=(unsigned long)im;
1238 im->timer.function=&igmp_timer_expire;
1239 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1244 write_lock_bh(&in_dev->mc_list_lock);
1245 im->next=in_dev->mc_list;
1247 write_unlock_bh(&in_dev->mc_list_lock);
1248 #ifdef CONFIG_IP_MULTICAST
1249 igmpv3_del_delrec(in_dev, im->multiaddr);
1251 igmp_group_added(im);
1253 ip_rt_multicast_event(in_dev);
1259 * Resend IGMP JOIN report; used for bonding.
1261 void ip_mc_rejoin_group(struct ip_mc_list *im)
1263 #ifdef CONFIG_IP_MULTICAST
1264 struct in_device *in_dev = im->interface;
1266 if (im->multiaddr == IGMP_ALL_HOSTS)
1269 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1270 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1274 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1275 IGMP_Unsolicited_Report_Count;
1276 igmp_ifc_event(in_dev);
1281 * A socket has left a multicast group on device dev
1284 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1286 struct ip_mc_list *i, **ip;
1290 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1291 if (i->multiaddr==addr) {
1292 if (--i->users == 0) {
1293 write_lock_bh(&in_dev->mc_list_lock);
1295 write_unlock_bh(&in_dev->mc_list_lock);
1296 igmp_group_dropped(i);
1299 ip_rt_multicast_event(in_dev);
1309 /* Device going down */
1311 void ip_mc_down(struct in_device *in_dev)
1313 struct ip_mc_list *i;
1317 for (i=in_dev->mc_list; i; i=i->next)
1318 igmp_group_dropped(i);
1320 #ifdef CONFIG_IP_MULTICAST
1321 in_dev->mr_ifc_count = 0;
1322 if (del_timer(&in_dev->mr_ifc_timer))
1323 __in_dev_put(in_dev);
1324 in_dev->mr_gq_running = 0;
1325 if (del_timer(&in_dev->mr_gq_timer))
1326 __in_dev_put(in_dev);
1327 igmpv3_clear_delrec(in_dev);
1330 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1333 void ip_mc_init_dev(struct in_device *in_dev)
1337 in_dev->mc_tomb = NULL;
1338 #ifdef CONFIG_IP_MULTICAST
1339 in_dev->mr_gq_running = 0;
1340 init_timer(&in_dev->mr_gq_timer);
1341 in_dev->mr_gq_timer.data=(unsigned long) in_dev;
1342 in_dev->mr_gq_timer.function=&igmp_gq_timer_expire;
1343 in_dev->mr_ifc_count = 0;
1344 init_timer(&in_dev->mr_ifc_timer);
1345 in_dev->mr_ifc_timer.data=(unsigned long) in_dev;
1346 in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire;
1347 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1350 rwlock_init(&in_dev->mc_list_lock);
1351 spin_lock_init(&in_dev->mc_tomb_lock);
1354 /* Device going up */
1356 void ip_mc_up(struct in_device *in_dev)
1358 struct ip_mc_list *i;
1362 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1364 for (i=in_dev->mc_list; i; i=i->next)
1365 igmp_group_added(i);
1369 * Device is about to be destroyed: clean up.
1372 void ip_mc_destroy_dev(struct in_device *in_dev)
1374 struct ip_mc_list *i;
1378 /* Deactivate timers */
1381 write_lock_bh(&in_dev->mc_list_lock);
1382 while ((i = in_dev->mc_list) != NULL) {
1383 in_dev->mc_list = i->next;
1384 write_unlock_bh(&in_dev->mc_list_lock);
1386 igmp_group_dropped(i);
1389 write_lock_bh(&in_dev->mc_list_lock);
1391 write_unlock_bh(&in_dev->mc_list_lock);
1394 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1396 struct flowi fl = { .nl_u = { .ip4_u =
1397 { .daddr = imr->imr_multiaddr.s_addr } } };
1399 struct net_device *dev = NULL;
1400 struct in_device *idev = NULL;
1402 if (imr->imr_ifindex) {
1403 idev = inetdev_by_index(imr->imr_ifindex);
1408 if (imr->imr_address.s_addr) {
1409 dev = ip_dev_find(imr->imr_address.s_addr);
1415 if (!dev && !ip_route_output_key(&rt, &fl)) {
1416 dev = rt->u.dst.dev;
1420 imr->imr_ifindex = dev->ifindex;
1421 idev = __in_dev_get_rtnl(dev);
1427 * Join a socket to a group
1429 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1430 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1433 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1436 struct ip_sf_list *psf, *psf_prev;
1440 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1441 if (psf->sf_inaddr == *psfsrc)
1445 if (!psf || psf->sf_count[sfmode] == 0) {
1446 /* source filter not found, or count wrong => bug */
1449 psf->sf_count[sfmode]--;
1450 if (psf->sf_count[sfmode] == 0) {
1451 ip_rt_multicast_event(pmc->interface);
1453 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1454 #ifdef CONFIG_IP_MULTICAST
1455 struct in_device *in_dev = pmc->interface;
1458 /* no more filters for this source */
1460 psf_prev->sf_next = psf->sf_next;
1462 pmc->sources = psf->sf_next;
1463 #ifdef CONFIG_IP_MULTICAST
1464 if (psf->sf_oldin &&
1465 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1466 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1467 IGMP_Unsolicited_Report_Count;
1468 psf->sf_next = pmc->tomb;
1478 #ifndef CONFIG_IP_MULTICAST
1479 #define igmp_ifc_event(x) do { } while (0)
1482 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1483 int sfcount, __be32 *psfsrc, int delta)
1485 struct ip_mc_list *pmc;
1491 read_lock(&in_dev->mc_list_lock);
1492 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1493 if (*pmca == pmc->multiaddr)
1497 /* MCA not found?? bug */
1498 read_unlock(&in_dev->mc_list_lock);
1501 spin_lock_bh(&pmc->lock);
1502 read_unlock(&in_dev->mc_list_lock);
1503 #ifdef CONFIG_IP_MULTICAST
1508 if (!pmc->sfcount[sfmode])
1510 pmc->sfcount[sfmode]--;
1513 for (i=0; i<sfcount; i++) {
1514 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1516 changerec |= rv > 0;
1520 if (pmc->sfmode == MCAST_EXCLUDE &&
1521 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1522 pmc->sfcount[MCAST_INCLUDE]) {
1523 #ifdef CONFIG_IP_MULTICAST
1524 struct ip_sf_list *psf;
1527 /* filter mode change */
1528 pmc->sfmode = MCAST_INCLUDE;
1529 #ifdef CONFIG_IP_MULTICAST
1530 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1531 IGMP_Unsolicited_Report_Count;
1532 in_dev->mr_ifc_count = pmc->crcount;
1533 for (psf=pmc->sources; psf; psf = psf->sf_next)
1534 psf->sf_crcount = 0;
1535 igmp_ifc_event(pmc->interface);
1536 } else if (sf_setstate(pmc) || changerec) {
1537 igmp_ifc_event(pmc->interface);
1541 spin_unlock_bh(&pmc->lock);
1546 * Add multicast single-source filter to the interface list
1548 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1549 __be32 *psfsrc, int delta)
1551 struct ip_sf_list *psf, *psf_prev;
1554 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1555 if (psf->sf_inaddr == *psfsrc)
1560 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1563 psf->sf_inaddr = *psfsrc;
1565 psf_prev->sf_next = psf;
1569 psf->sf_count[sfmode]++;
1570 if (psf->sf_count[sfmode] == 1) {
1571 ip_rt_multicast_event(pmc->interface);
1576 #ifdef CONFIG_IP_MULTICAST
1577 static void sf_markstate(struct ip_mc_list *pmc)
1579 struct ip_sf_list *psf;
1580 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1582 for (psf=pmc->sources; psf; psf=psf->sf_next)
1583 if (pmc->sfcount[MCAST_EXCLUDE]) {
1584 psf->sf_oldin = mca_xcount ==
1585 psf->sf_count[MCAST_EXCLUDE] &&
1586 !psf->sf_count[MCAST_INCLUDE];
1588 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1591 static int sf_setstate(struct ip_mc_list *pmc)
1593 struct ip_sf_list *psf, *dpsf;
1594 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1595 int qrv = pmc->interface->mr_qrv;
1599 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1600 if (pmc->sfcount[MCAST_EXCLUDE]) {
1601 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1602 !psf->sf_count[MCAST_INCLUDE];
1604 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1606 if (!psf->sf_oldin) {
1607 struct ip_sf_list *prev = NULL;
1609 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1610 if (dpsf->sf_inaddr == psf->sf_inaddr)
1616 prev->sf_next = dpsf->sf_next;
1618 pmc->tomb = dpsf->sf_next;
1621 psf->sf_crcount = qrv;
1624 } else if (psf->sf_oldin) {
1626 psf->sf_crcount = 0;
1628 * add or update "delete" records if an active filter
1631 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1632 if (dpsf->sf_inaddr == psf->sf_inaddr)
1635 dpsf = (struct ip_sf_list *)
1636 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1640 /* pmc->lock held by callers */
1641 dpsf->sf_next = pmc->tomb;
1644 dpsf->sf_crcount = qrv;
1653 * Add multicast source filter list to the interface list
1655 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1656 int sfcount, __be32 *psfsrc, int delta)
1658 struct ip_mc_list *pmc;
1664 read_lock(&in_dev->mc_list_lock);
1665 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1666 if (*pmca == pmc->multiaddr)
1670 /* MCA not found?? bug */
1671 read_unlock(&in_dev->mc_list_lock);
1674 spin_lock_bh(&pmc->lock);
1675 read_unlock(&in_dev->mc_list_lock);
1677 #ifdef CONFIG_IP_MULTICAST
1680 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1682 pmc->sfcount[sfmode]++;
1684 for (i=0; i<sfcount; i++) {
1685 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1692 pmc->sfcount[sfmode]--;
1694 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1695 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1696 #ifdef CONFIG_IP_MULTICAST
1697 struct in_device *in_dev = pmc->interface;
1698 struct ip_sf_list *psf;
1701 /* filter mode change */
1702 if (pmc->sfcount[MCAST_EXCLUDE])
1703 pmc->sfmode = MCAST_EXCLUDE;
1704 else if (pmc->sfcount[MCAST_INCLUDE])
1705 pmc->sfmode = MCAST_INCLUDE;
1706 #ifdef CONFIG_IP_MULTICAST
1707 /* else no filters; keep old mode for reports */
1709 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1710 IGMP_Unsolicited_Report_Count;
1711 in_dev->mr_ifc_count = pmc->crcount;
1712 for (psf=pmc->sources; psf; psf = psf->sf_next)
1713 psf->sf_crcount = 0;
1714 igmp_ifc_event(in_dev);
1715 } else if (sf_setstate(pmc)) {
1716 igmp_ifc_event(in_dev);
1719 spin_unlock_bh(&pmc->lock);
1723 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1725 struct ip_sf_list *psf, *nextpsf;
1727 for (psf=pmc->tomb; psf; psf=nextpsf) {
1728 nextpsf = psf->sf_next;
1732 for (psf=pmc->sources; psf; psf=nextpsf) {
1733 nextpsf = psf->sf_next;
1736 pmc->sources = NULL;
1737 pmc->sfmode = MCAST_EXCLUDE;
1738 pmc->sfcount[MCAST_INCLUDE] = 0;
1739 pmc->sfcount[MCAST_EXCLUDE] = 1;
1744 * Join a multicast group
1746 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1749 __be32 addr = imr->imr_multiaddr.s_addr;
1750 struct ip_mc_socklist *iml=NULL, *i;
1751 struct in_device *in_dev;
1752 struct inet_sock *inet = inet_sk(sk);
1756 if (!MULTICAST(addr))
1761 in_dev = ip_mc_find_dev(imr);
1770 ifindex = imr->imr_ifindex;
1771 for (i = inet->mc_list; i; i = i->next) {
1772 if (i->multi.imr_multiaddr.s_addr == addr &&
1773 i->multi.imr_ifindex == ifindex)
1778 if (count >= sysctl_igmp_max_memberships)
1780 iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1784 memcpy(&iml->multi, imr, sizeof(*imr));
1785 iml->next = inet->mc_list;
1787 iml->sfmode = MCAST_EXCLUDE;
1788 inet->mc_list = iml;
1789 ip_mc_inc_group(in_dev, addr);
1796 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1797 struct in_device *in_dev)
1801 if (iml->sflist == 0) {
1802 /* any-source empty exclude case */
1803 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1804 iml->sfmode, 0, NULL, 0);
1806 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1807 iml->sfmode, iml->sflist->sl_count,
1808 iml->sflist->sl_addr, 0);
1809 sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1815 * Ask a socket to leave a group.
1818 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1820 struct inet_sock *inet = inet_sk(sk);
1821 struct ip_mc_socklist *iml, **imlp;
1822 struct in_device *in_dev;
1823 __be32 group = imr->imr_multiaddr.s_addr;
1825 int ret = -EADDRNOTAVAIL;
1828 in_dev = ip_mc_find_dev(imr);
1829 ifindex = imr->imr_ifindex;
1830 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1831 if (iml->multi.imr_multiaddr.s_addr != group)
1834 if (iml->multi.imr_ifindex != ifindex)
1836 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1837 iml->multi.imr_address.s_addr)
1840 (void) ip_mc_leave_src(sk, iml, in_dev);
1845 ip_mc_dec_group(in_dev, group);
1847 sock_kfree_s(sk, iml, sizeof(*iml));
1856 int ip_mc_source(int add, int omode, struct sock *sk, struct
1857 ip_mreq_source *mreqs, int ifindex)
1860 struct ip_mreqn imr;
1861 __be32 addr = mreqs->imr_multiaddr;
1862 struct ip_mc_socklist *pmc;
1863 struct in_device *in_dev = NULL;
1864 struct inet_sock *inet = inet_sk(sk);
1865 struct ip_sf_socklist *psl;
1869 if (!MULTICAST(addr))
1874 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1875 imr.imr_address.s_addr = mreqs->imr_interface;
1876 imr.imr_ifindex = ifindex;
1877 in_dev = ip_mc_find_dev(&imr);
1883 err = -EADDRNOTAVAIL;
1885 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1886 if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1887 && pmc->multi.imr_ifindex == imr.imr_ifindex)
1890 if (!pmc) { /* must have a prior join */
1894 /* if a source filter was set, must be the same mode as before */
1896 if (pmc->sfmode != omode) {
1900 } else if (pmc->sfmode != omode) {
1901 /* allow mode switches for empty-set filters */
1902 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1903 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1905 pmc->sfmode = omode;
1911 goto done; /* err = -EADDRNOTAVAIL */
1913 for (i=0; i<psl->sl_count; i++) {
1914 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1919 if (rv) /* source not found */
1920 goto done; /* err = -EADDRNOTAVAIL */
1922 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1923 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1928 /* update the interface filter */
1929 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1930 &mreqs->imr_sourceaddr, 1);
1932 for (j=i+1; j<psl->sl_count; j++)
1933 psl->sl_addr[j-1] = psl->sl_addr[j];
1938 /* else, add a new source to the filter */
1940 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1944 if (!psl || psl->sl_count == psl->sl_max) {
1945 struct ip_sf_socklist *newpsl;
1946 int count = IP_SFBLOCK;
1949 count += psl->sl_max;
1950 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1955 newpsl->sl_max = count;
1956 newpsl->sl_count = count - IP_SFBLOCK;
1958 for (i=0; i<psl->sl_count; i++)
1959 newpsl->sl_addr[i] = psl->sl_addr[i];
1960 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1962 pmc->sflist = psl = newpsl;
1964 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
1965 for (i=0; i<psl->sl_count; i++) {
1966 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1971 if (rv == 0) /* address already there is an error */
1973 for (j=psl->sl_count-1; j>=i; j--)
1974 psl->sl_addr[j+1] = psl->sl_addr[j];
1975 psl->sl_addr[i] = mreqs->imr_sourceaddr;
1978 /* update the interface list */
1979 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1980 &mreqs->imr_sourceaddr, 1);
1984 return ip_mc_leave_group(sk, &imr);
1988 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1991 struct ip_mreqn imr;
1992 __be32 addr = msf->imsf_multiaddr;
1993 struct ip_mc_socklist *pmc;
1994 struct in_device *in_dev;
1995 struct inet_sock *inet = inet_sk(sk);
1996 struct ip_sf_socklist *newpsl, *psl;
1999 if (!MULTICAST(addr))
2001 if (msf->imsf_fmode != MCAST_INCLUDE &&
2002 msf->imsf_fmode != MCAST_EXCLUDE)
2007 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2008 imr.imr_address.s_addr = msf->imsf_interface;
2009 imr.imr_ifindex = ifindex;
2010 in_dev = ip_mc_find_dev(&imr);
2017 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2018 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2023 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2024 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2025 pmc->multi.imr_ifindex == imr.imr_ifindex)
2028 if (!pmc) { /* must have a prior join */
2032 if (msf->imsf_numsrc) {
2033 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2039 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2040 memcpy(newpsl->sl_addr, msf->imsf_slist,
2041 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2042 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2043 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2045 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2050 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2051 msf->imsf_fmode, 0, NULL, 0);
2055 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2056 psl->sl_count, psl->sl_addr, 0);
2057 sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2059 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2061 pmc->sflist = newpsl;
2062 pmc->sfmode = msf->imsf_fmode;
2067 err = ip_mc_leave_group(sk, &imr);
2071 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2072 struct ip_msfilter __user *optval, int __user *optlen)
2074 int err, len, count, copycount;
2075 struct ip_mreqn imr;
2076 __be32 addr = msf->imsf_multiaddr;
2077 struct ip_mc_socklist *pmc;
2078 struct in_device *in_dev;
2079 struct inet_sock *inet = inet_sk(sk);
2080 struct ip_sf_socklist *psl;
2082 if (!MULTICAST(addr))
2087 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2088 imr.imr_address.s_addr = msf->imsf_interface;
2089 imr.imr_ifindex = 0;
2090 in_dev = ip_mc_find_dev(&imr);
2096 err = -EADDRNOTAVAIL;
2098 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2099 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2100 pmc->multi.imr_ifindex == imr.imr_ifindex)
2103 if (!pmc) /* must have a prior join */
2105 msf->imsf_fmode = pmc->sfmode;
2112 count = psl->sl_count;
2114 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2115 len = copycount * sizeof(psl->sl_addr[0]);
2116 msf->imsf_numsrc = count;
2117 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2118 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2122 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2130 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2131 struct group_filter __user *optval, int __user *optlen)
2133 int err, i, count, copycount;
2134 struct sockaddr_in *psin;
2136 struct ip_mc_socklist *pmc;
2137 struct inet_sock *inet = inet_sk(sk);
2138 struct ip_sf_socklist *psl;
2140 psin = (struct sockaddr_in *)&gsf->gf_group;
2141 if (psin->sin_family != AF_INET)
2143 addr = psin->sin_addr.s_addr;
2144 if (!MULTICAST(addr))
2149 err = -EADDRNOTAVAIL;
2151 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2152 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2153 pmc->multi.imr_ifindex == gsf->gf_interface)
2156 if (!pmc) /* must have a prior join */
2158 gsf->gf_fmode = pmc->sfmode;
2161 count = psl ? psl->sl_count : 0;
2162 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2163 gsf->gf_numsrc = count;
2164 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2165 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2168 for (i=0; i<copycount; i++) {
2169 struct sockaddr_in *psin;
2170 struct sockaddr_storage ss;
2172 psin = (struct sockaddr_in *)&ss;
2173 memset(&ss, 0, sizeof(ss));
2174 psin->sin_family = AF_INET;
2175 psin->sin_addr.s_addr = psl->sl_addr[i];
2176 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2186 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2188 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2190 struct inet_sock *inet = inet_sk(sk);
2191 struct ip_mc_socklist *pmc;
2192 struct ip_sf_socklist *psl;
2195 if (!MULTICAST(loc_addr))
2198 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2199 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2200 pmc->multi.imr_ifindex == dif)
2207 return pmc->sfmode == MCAST_EXCLUDE;
2209 for (i=0; i<psl->sl_count; i++) {
2210 if (psl->sl_addr[i] == rmt_addr)
2213 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2215 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2221 * A socket is closing.
2224 void ip_mc_drop_socket(struct sock *sk)
2226 struct inet_sock *inet = inet_sk(sk);
2227 struct ip_mc_socklist *iml;
2229 if (inet->mc_list == NULL)
2233 while ((iml = inet->mc_list) != NULL) {
2234 struct in_device *in_dev;
2235 inet->mc_list = iml->next;
2237 in_dev = inetdev_by_index(iml->multi.imr_ifindex);
2238 (void) ip_mc_leave_src(sk, iml, in_dev);
2239 if (in_dev != NULL) {
2240 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2243 sock_kfree_s(sk, iml, sizeof(*iml));
2248 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2250 struct ip_mc_list *im;
2251 struct ip_sf_list *psf;
2254 read_lock(&in_dev->mc_list_lock);
2255 for (im=in_dev->mc_list; im; im=im->next) {
2256 if (im->multiaddr == mc_addr)
2259 if (im && proto == IPPROTO_IGMP) {
2263 for (psf=im->sources; psf; psf=psf->sf_next) {
2264 if (psf->sf_inaddr == src_addr)
2268 rv = psf->sf_count[MCAST_INCLUDE] ||
2269 psf->sf_count[MCAST_EXCLUDE] !=
2270 im->sfcount[MCAST_EXCLUDE];
2272 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2274 rv = 1; /* unspecified source; tentatively allow */
2276 read_unlock(&in_dev->mc_list_lock);
2280 #if defined(CONFIG_PROC_FS)
2281 struct igmp_mc_iter_state {
2282 struct net_device *dev;
2283 struct in_device *in_dev;
2286 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2288 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2290 struct ip_mc_list *im = NULL;
2291 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2293 state->in_dev = NULL;
2294 for_each_netdev(state->dev) {
2295 struct in_device *in_dev;
2296 in_dev = in_dev_get(state->dev);
2299 read_lock(&in_dev->mc_list_lock);
2300 im = in_dev->mc_list;
2302 state->in_dev = in_dev;
2305 read_unlock(&in_dev->mc_list_lock);
2311 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2313 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2316 if (likely(state->in_dev != NULL)) {
2317 read_unlock(&state->in_dev->mc_list_lock);
2318 in_dev_put(state->in_dev);
2320 state->dev = next_net_device(state->dev);
2322 state->in_dev = NULL;
2325 state->in_dev = in_dev_get(state->dev);
2328 read_lock(&state->in_dev->mc_list_lock);
2329 im = state->in_dev->mc_list;
2334 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2336 struct ip_mc_list *im = igmp_mc_get_first(seq);
2338 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2340 return pos ? NULL : im;
2343 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2345 read_lock(&dev_base_lock);
2346 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2349 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2351 struct ip_mc_list *im;
2352 if (v == SEQ_START_TOKEN)
2353 im = igmp_mc_get_first(seq);
2355 im = igmp_mc_get_next(seq, v);
2360 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2362 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2363 if (likely(state->in_dev != NULL)) {
2364 read_unlock(&state->in_dev->mc_list_lock);
2365 in_dev_put(state->in_dev);
2366 state->in_dev = NULL;
2369 read_unlock(&dev_base_lock);
2372 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2374 if (v == SEQ_START_TOKEN)
2376 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2378 struct ip_mc_list *im = (struct ip_mc_list *)v;
2379 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2381 #ifdef CONFIG_IP_MULTICAST
2382 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2383 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2389 if (state->in_dev->mc_list == im) {
2390 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2391 state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2395 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2396 im->multiaddr, im->users,
2397 im->tm_running, im->tm_running ?
2398 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2404 static const struct seq_operations igmp_mc_seq_ops = {
2405 .start = igmp_mc_seq_start,
2406 .next = igmp_mc_seq_next,
2407 .stop = igmp_mc_seq_stop,
2408 .show = igmp_mc_seq_show,
2411 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2413 struct seq_file *seq;
2415 struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2419 rc = seq_open(file, &igmp_mc_seq_ops);
2423 seq = file->private_data;
2432 static const struct file_operations igmp_mc_seq_fops = {
2433 .owner = THIS_MODULE,
2434 .open = igmp_mc_seq_open,
2436 .llseek = seq_lseek,
2437 .release = seq_release_private,
2440 struct igmp_mcf_iter_state {
2441 struct net_device *dev;
2442 struct in_device *idev;
2443 struct ip_mc_list *im;
2446 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2448 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2450 struct ip_sf_list *psf = NULL;
2451 struct ip_mc_list *im = NULL;
2452 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2456 for_each_netdev(state->dev) {
2457 struct in_device *idev;
2458 idev = in_dev_get(state->dev);
2459 if (unlikely(idev == NULL))
2461 read_lock(&idev->mc_list_lock);
2463 if (likely(im != NULL)) {
2464 spin_lock_bh(&im->lock);
2466 if (likely(psf != NULL)) {
2471 spin_unlock_bh(&im->lock);
2473 read_unlock(&idev->mc_list_lock);
2479 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2481 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2485 spin_unlock_bh(&state->im->lock);
2486 state->im = state->im->next;
2487 while (!state->im) {
2488 if (likely(state->idev != NULL)) {
2489 read_unlock(&state->idev->mc_list_lock);
2490 in_dev_put(state->idev);
2492 state->dev = next_net_device(state->dev);
2497 state->idev = in_dev_get(state->dev);
2500 read_lock(&state->idev->mc_list_lock);
2501 state->im = state->idev->mc_list;
2505 spin_lock_bh(&state->im->lock);
2506 psf = state->im->sources;
2512 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2514 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2516 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2518 return pos ? NULL : psf;
2521 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2523 read_lock(&dev_base_lock);
2524 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2527 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2529 struct ip_sf_list *psf;
2530 if (v == SEQ_START_TOKEN)
2531 psf = igmp_mcf_get_first(seq);
2533 psf = igmp_mcf_get_next(seq, v);
2538 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2540 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2541 if (likely(state->im != NULL)) {
2542 spin_unlock_bh(&state->im->lock);
2545 if (likely(state->idev != NULL)) {
2546 read_unlock(&state->idev->mc_list_lock);
2547 in_dev_put(state->idev);
2551 read_unlock(&dev_base_lock);
2554 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2556 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2557 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2559 if (v == SEQ_START_TOKEN) {
2562 "%10s %10s %6s %6s\n", "Idx",
2564 "SRC", "INC", "EXC");
2568 "0x%08x %6lu %6lu\n",
2569 state->dev->ifindex, state->dev->name,
2570 ntohl(state->im->multiaddr),
2571 ntohl(psf->sf_inaddr),
2572 psf->sf_count[MCAST_INCLUDE],
2573 psf->sf_count[MCAST_EXCLUDE]);
2578 static const struct seq_operations igmp_mcf_seq_ops = {
2579 .start = igmp_mcf_seq_start,
2580 .next = igmp_mcf_seq_next,
2581 .stop = igmp_mcf_seq_stop,
2582 .show = igmp_mcf_seq_show,
2585 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2587 struct seq_file *seq;
2589 struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2593 rc = seq_open(file, &igmp_mcf_seq_ops);
2597 seq = file->private_data;
2606 static const struct file_operations igmp_mcf_seq_fops = {
2607 .owner = THIS_MODULE,
2608 .open = igmp_mcf_seq_open,
2610 .llseek = seq_lseek,
2611 .release = seq_release_private,
2614 int __init igmp_mc_proc_init(void)
2616 proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops);
2617 proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2622 EXPORT_SYMBOL(ip_mc_dec_group);
2623 EXPORT_SYMBOL(ip_mc_inc_group);
2624 EXPORT_SYMBOL(ip_mc_join_group);
2625 EXPORT_SYMBOL(ip_mc_rejoin_group);