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 <asm/uaccess.h>
75 #include <asm/system.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>
92 #include <net/net_namespace.h>
95 #include <net/protocol.h>
96 #include <net/route.h>
98 #include <net/checksum.h>
99 #include <linux/netfilter_ipv4.h>
100 #ifdef CONFIG_IP_MROUTE
101 #include <linux/mroute.h>
103 #ifdef CONFIG_PROC_FS
104 #include <linux/proc_fs.h>
105 #include <linux/seq_file.h>
108 #define IP_MAX_MEMBERSHIPS 20
109 #define IP_MAX_MSF 10
111 #ifdef CONFIG_IP_MULTICAST
112 /* Parameter names and values are taken from igmp-v2-06 draft */
114 #define IGMP_V1_Router_Present_Timeout (400*HZ)
115 #define IGMP_V2_Router_Present_Timeout (400*HZ)
116 #define IGMP_Unsolicited_Report_Interval (10*HZ)
117 #define IGMP_Query_Response_Interval (10*HZ)
118 #define IGMP_Unsolicited_Report_Count 2
121 #define IGMP_Initial_Report_Delay (1)
123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
141 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
142 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
143 static void igmpv3_clear_delrec(struct in_device *in_dev);
144 static int sf_setstate(struct ip_mc_list *pmc);
145 static void sf_markstate(struct ip_mc_list *pmc);
147 static void ip_mc_clear_src(struct ip_mc_list *pmc);
148 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
149 int sfcount, __be32 *psfsrc, int delta);
151 static void ip_ma_put(struct ip_mc_list *im)
153 if (atomic_dec_and_test(&im->refcnt)) {
154 in_dev_put(im->interface);
159 #ifdef CONFIG_IP_MULTICAST
165 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
167 spin_lock_bh(&im->lock);
168 if (del_timer(&im->timer))
169 atomic_dec(&im->refcnt);
172 im->unsolicit_count = 0;
173 spin_unlock_bh(&im->lock);
176 /* It must be called with locked im->lock */
177 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
179 int tv = net_random() % max_delay;
182 if (!mod_timer(&im->timer, jiffies+tv+2))
183 atomic_inc(&im->refcnt);
186 static void igmp_gq_start_timer(struct in_device *in_dev)
188 int tv = net_random() % in_dev->mr_maxdelay;
190 in_dev->mr_gq_running = 1;
191 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
195 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
197 int tv = net_random() % delay;
199 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
203 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
205 spin_lock_bh(&im->lock);
206 im->unsolicit_count = 0;
207 if (del_timer(&im->timer)) {
208 if ((long)(im->timer.expires-jiffies) < max_delay) {
209 add_timer(&im->timer);
211 spin_unlock_bh(&im->lock);
214 atomic_dec(&im->refcnt);
216 igmp_start_timer(im, max_delay);
217 spin_unlock_bh(&im->lock);
222 * Send an IGMP report.
225 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
228 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
229 int gdeleted, int sdeleted)
232 case IGMPV3_MODE_IS_INCLUDE:
233 case IGMPV3_MODE_IS_EXCLUDE:
234 if (gdeleted || sdeleted)
236 if (!(pmc->gsquery && !psf->sf_gsresp)) {
237 if (pmc->sfmode == MCAST_INCLUDE)
239 /* don't include if this source is excluded
242 if (psf->sf_count[MCAST_INCLUDE])
243 return type == IGMPV3_MODE_IS_INCLUDE;
244 return pmc->sfcount[MCAST_EXCLUDE] ==
245 psf->sf_count[MCAST_EXCLUDE];
248 case IGMPV3_CHANGE_TO_INCLUDE:
249 if (gdeleted || sdeleted)
251 return psf->sf_count[MCAST_INCLUDE] != 0;
252 case IGMPV3_CHANGE_TO_EXCLUDE:
253 if (gdeleted || sdeleted)
255 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
256 psf->sf_count[MCAST_INCLUDE])
258 return pmc->sfcount[MCAST_EXCLUDE] ==
259 psf->sf_count[MCAST_EXCLUDE];
260 case IGMPV3_ALLOW_NEW_SOURCES:
261 if (gdeleted || !psf->sf_crcount)
263 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
264 case IGMPV3_BLOCK_OLD_SOURCES:
265 if (pmc->sfmode == MCAST_INCLUDE)
266 return gdeleted || (psf->sf_crcount && sdeleted);
267 return psf->sf_crcount && !gdeleted && !sdeleted;
273 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
275 struct ip_sf_list *psf;
278 for (psf=pmc->sources; psf; psf=psf->sf_next) {
279 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
286 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
291 struct igmpv3_report *pig;
292 struct net *net = dev_net(dev);
294 skb = alloc_skb(size + LL_ALLOCATED_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(net, &rt, &fl)) {
308 if (rt->rt_src == 0) {
314 skb_dst_set(skb, &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 igmphdr *pig = igmp_hdr(skb);
352 const int igmplen = skb->tail - skb->transport_header;
354 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
356 return ip_local_out(skb);
359 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
361 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
364 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
365 int type, struct igmpv3_grec **ppgr)
367 struct net_device *dev = pmc->interface->dev;
368 struct igmpv3_report *pih;
369 struct igmpv3_grec *pgr;
372 skb = igmpv3_newpack(dev, dev->mtu);
375 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
376 pgr->grec_type = type;
377 pgr->grec_auxwords = 0;
379 pgr->grec_mca = pmc->multiaddr;
380 pih = igmpv3_report_hdr(skb);
381 pih->ngrec = htons(ntohs(pih->ngrec)+1);
386 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
387 skb_tailroom(skb)) : 0)
389 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
390 int type, int gdeleted, int sdeleted)
392 struct net_device *dev = pmc->interface->dev;
393 struct igmpv3_report *pih;
394 struct igmpv3_grec *pgr = NULL;
395 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
396 int scount, stotal, first, isquery, truncate;
398 if (pmc->multiaddr == IGMP_ALL_HOSTS)
401 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
402 type == IGMPV3_MODE_IS_EXCLUDE;
403 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
404 type == IGMPV3_CHANGE_TO_EXCLUDE;
408 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
413 pih = skb ? igmpv3_report_hdr(skb) : NULL;
415 /* EX and TO_EX get a fresh packet, if needed */
417 if (pih && pih->ngrec &&
418 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420 igmpv3_sendpack(skb);
421 skb = igmpv3_newpack(dev, dev->mtu);
426 for (psf=*psf_list; psf; psf=psf_next) {
429 psf_next = psf->sf_next;
431 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
436 /* clear marks on query responses */
440 if (AVAILABLE(skb) < sizeof(__be32) +
441 first*sizeof(struct igmpv3_grec)) {
442 if (truncate && !first)
443 break; /* truncate these */
445 pgr->grec_nsrcs = htons(scount);
447 igmpv3_sendpack(skb);
448 skb = igmpv3_newpack(dev, dev->mtu);
453 skb = add_grhead(skb, pmc, type, &pgr);
458 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
459 *psrc = psf->sf_inaddr;
461 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
462 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
464 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
466 psf_prev->sf_next = psf->sf_next;
468 *psf_list = psf->sf_next;
478 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
479 type == IGMPV3_BLOCK_OLD_SOURCES)
481 if (pmc->crcount || isquery) {
482 /* make sure we have room for group header */
483 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
484 igmpv3_sendpack(skb);
485 skb = NULL; /* add_grhead will get a new one */
487 skb = add_grhead(skb, pmc, type, &pgr);
491 pgr->grec_nsrcs = htons(scount);
494 pmc->gsquery = 0; /* clear query state on report */
498 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
500 struct sk_buff *skb = NULL;
504 read_lock(&in_dev->mc_list_lock);
505 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
506 if (pmc->multiaddr == IGMP_ALL_HOSTS)
508 spin_lock_bh(&pmc->lock);
509 if (pmc->sfcount[MCAST_EXCLUDE])
510 type = IGMPV3_MODE_IS_EXCLUDE;
512 type = IGMPV3_MODE_IS_INCLUDE;
513 skb = add_grec(skb, pmc, type, 0, 0);
514 spin_unlock_bh(&pmc->lock);
516 read_unlock(&in_dev->mc_list_lock);
518 spin_lock_bh(&pmc->lock);
519 if (pmc->sfcount[MCAST_EXCLUDE])
520 type = IGMPV3_MODE_IS_EXCLUDE;
522 type = IGMPV3_MODE_IS_INCLUDE;
523 skb = add_grec(skb, pmc, type, 0, 0);
524 spin_unlock_bh(&pmc->lock);
528 return igmpv3_sendpack(skb);
532 * remove zero-count source records from a source filter list
534 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
536 struct ip_sf_list *psf_prev, *psf_next, *psf;
539 for (psf=*ppsf; psf; psf = psf_next) {
540 psf_next = psf->sf_next;
541 if (psf->sf_crcount == 0) {
543 psf_prev->sf_next = psf->sf_next;
545 *ppsf = psf->sf_next;
552 static void igmpv3_send_cr(struct in_device *in_dev)
554 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
555 struct sk_buff *skb = NULL;
558 read_lock(&in_dev->mc_list_lock);
559 spin_lock_bh(&in_dev->mc_tomb_lock);
563 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
564 pmc_next = pmc->next;
565 if (pmc->sfmode == MCAST_INCLUDE) {
566 type = IGMPV3_BLOCK_OLD_SOURCES;
567 dtype = IGMPV3_BLOCK_OLD_SOURCES;
568 skb = add_grec(skb, pmc, type, 1, 0);
569 skb = add_grec(skb, pmc, dtype, 1, 1);
572 if (pmc->sfmode == MCAST_EXCLUDE) {
573 type = IGMPV3_CHANGE_TO_INCLUDE;
574 skb = add_grec(skb, pmc, type, 1, 0);
577 if (pmc->crcount == 0) {
578 igmpv3_clear_zeros(&pmc->tomb);
579 igmpv3_clear_zeros(&pmc->sources);
582 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
584 pmc_prev->next = pmc_next;
586 in_dev->mc_tomb = pmc_next;
587 in_dev_put(pmc->interface);
592 spin_unlock_bh(&in_dev->mc_tomb_lock);
595 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
596 spin_lock_bh(&pmc->lock);
597 if (pmc->sfcount[MCAST_EXCLUDE]) {
598 type = IGMPV3_BLOCK_OLD_SOURCES;
599 dtype = IGMPV3_ALLOW_NEW_SOURCES;
601 type = IGMPV3_ALLOW_NEW_SOURCES;
602 dtype = IGMPV3_BLOCK_OLD_SOURCES;
604 skb = add_grec(skb, pmc, type, 0, 0);
605 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
607 /* filter mode changes */
609 if (pmc->sfmode == MCAST_EXCLUDE)
610 type = IGMPV3_CHANGE_TO_EXCLUDE;
612 type = IGMPV3_CHANGE_TO_INCLUDE;
613 skb = add_grec(skb, pmc, type, 0, 0);
616 spin_unlock_bh(&pmc->lock);
618 read_unlock(&in_dev->mc_list_lock);
622 (void) igmpv3_sendpack(skb);
625 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
632 struct net_device *dev = in_dev->dev;
633 struct net *net = dev_net(dev);
634 __be32 group = pmc ? pmc->multiaddr : 0;
637 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
638 return igmpv3_send_report(in_dev, pmc);
639 else if (type == IGMP_HOST_LEAVE_MESSAGE)
640 dst = IGMP_ALL_ROUTER;
645 struct flowi fl = { .oif = dev->ifindex,
646 .nl_u = { .ip4_u = { .daddr = dst } },
647 .proto = IPPROTO_IGMP };
648 if (ip_route_output_key(net, &rt, &fl))
651 if (rt->rt_src == 0) {
656 skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
662 skb_dst_set(skb, &rt->u.dst);
664 skb_reserve(skb, LL_RESERVED_SPACE(dev));
666 skb_reset_network_header(skb);
668 skb_put(skb, sizeof(struct iphdr) + 4);
671 iph->ihl = (sizeof(struct iphdr)+4)>>2;
673 iph->frag_off = htons(IP_DF);
676 iph->saddr = rt->rt_src;
677 iph->protocol = IPPROTO_IGMP;
678 ip_select_ident(iph, &rt->u.dst, NULL);
679 ((u8*)&iph[1])[0] = IPOPT_RA;
680 ((u8*)&iph[1])[1] = 4;
681 ((u8*)&iph[1])[2] = 0;
682 ((u8*)&iph[1])[3] = 0;
684 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
689 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
691 return ip_local_out(skb);
694 static void igmp_gq_timer_expire(unsigned long data)
696 struct in_device *in_dev = (struct in_device *)data;
698 in_dev->mr_gq_running = 0;
699 igmpv3_send_report(in_dev, NULL);
700 __in_dev_put(in_dev);
703 static void igmp_ifc_timer_expire(unsigned long data)
705 struct in_device *in_dev = (struct in_device *)data;
707 igmpv3_send_cr(in_dev);
708 if (in_dev->mr_ifc_count) {
709 in_dev->mr_ifc_count--;
710 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
712 __in_dev_put(in_dev);
715 static void igmp_ifc_event(struct in_device *in_dev)
717 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
719 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
720 IGMP_Unsolicited_Report_Count;
721 igmp_ifc_start_timer(in_dev, 1);
725 static void igmp_timer_expire(unsigned long data)
727 struct ip_mc_list *im=(struct ip_mc_list *)data;
728 struct in_device *in_dev = im->interface;
730 spin_lock(&im->lock);
733 if (im->unsolicit_count) {
734 im->unsolicit_count--;
735 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
738 spin_unlock(&im->lock);
740 if (IGMP_V1_SEEN(in_dev))
741 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
742 else if (IGMP_V2_SEEN(in_dev))
743 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
745 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
750 /* mark EXCLUDE-mode sources */
751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
753 struct ip_sf_list *psf;
757 for (psf=pmc->sources; psf; psf=psf->sf_next) {
760 for (i=0; i<nsrcs; i++) {
761 /* skip inactive filters */
762 if (pmc->sfcount[MCAST_INCLUDE] ||
763 pmc->sfcount[MCAST_EXCLUDE] !=
764 psf->sf_count[MCAST_EXCLUDE])
766 if (srcs[i] == psf->sf_inaddr) {
773 if (scount == nsrcs) /* all sources excluded */
778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
780 struct ip_sf_list *psf;
783 if (pmc->sfmode == MCAST_EXCLUDE)
784 return igmp_xmarksources(pmc, nsrcs, srcs);
786 /* mark INCLUDE-mode sources */
788 for (psf=pmc->sources; psf; psf=psf->sf_next) {
791 for (i=0; i<nsrcs; i++)
792 if (srcs[i] == psf->sf_inaddr) {
806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
808 struct ip_mc_list *im;
810 /* Timers are only set for non-local groups */
812 if (group == IGMP_ALL_HOSTS)
815 read_lock(&in_dev->mc_list_lock);
816 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
817 if (im->multiaddr == group) {
822 read_unlock(&in_dev->mc_list_lock);
825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
828 struct igmphdr *ih = igmp_hdr(skb);
829 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
830 struct ip_mc_list *im;
831 __be32 group = ih->group;
838 /* Alas, old v1 router presents here. */
840 max_delay = IGMP_Query_Response_Interval;
841 in_dev->mr_v1_seen = jiffies +
842 IGMP_V1_Router_Present_Timeout;
845 /* v2 router present */
846 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
847 in_dev->mr_v2_seen = jiffies +
848 IGMP_V2_Router_Present_Timeout;
850 /* cancel the interface change timer */
851 in_dev->mr_ifc_count = 0;
852 if (del_timer(&in_dev->mr_ifc_timer))
853 __in_dev_put(in_dev);
854 /* clear deleted report items */
855 igmpv3_clear_delrec(in_dev);
856 } else if (len < 12) {
857 return; /* ignore bogus packet; freed by caller */
859 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
862 ih3 = igmpv3_query_hdr(skb);
864 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
865 + ntohs(ih3->nsrcs)*sizeof(__be32)))
867 ih3 = igmpv3_query_hdr(skb);
870 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
872 max_delay = 1; /* can't mod w/ 0 */
873 in_dev->mr_maxdelay = max_delay;
875 in_dev->mr_qrv = ih3->qrv;
876 if (!group) { /* general query */
878 return; /* no sources allowed */
879 igmp_gq_start_timer(in_dev);
882 /* mark sources to include, if group & source-specific */
883 mark = ih3->nsrcs != 0;
887 * - Start the timers in all of our membership records
888 * that the query applies to for the interface on
889 * which the query arrived excl. those that belong
890 * to a "local" group (224.0.0.X)
891 * - For timers already running check if they need to
893 * - Use the igmp->igmp_code field as the maximum
896 read_lock(&in_dev->mc_list_lock);
897 for (im=in_dev->mc_list; im!=NULL; im=im->next) {
900 if (group && group != im->multiaddr)
902 if (im->multiaddr == IGMP_ALL_HOSTS)
904 spin_lock_bh(&im->lock);
906 im->gsquery = im->gsquery && mark;
909 changed = !im->gsquery ||
910 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
911 spin_unlock_bh(&im->lock);
913 igmp_mod_timer(im, max_delay);
915 read_unlock(&in_dev->mc_list_lock);
918 int igmp_rcv(struct sk_buff *skb)
920 /* This basically follows the spec line by line -- see RFC1112 */
922 struct in_device *in_dev = in_dev_get(skb->dev);
928 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
931 switch (skb->ip_summed) {
932 case CHECKSUM_COMPLETE:
933 if (!csum_fold(skb->csum))
938 if (__skb_checksum_complete(skb))
944 case IGMP_HOST_MEMBERSHIP_QUERY:
945 igmp_heard_query(in_dev, skb, len);
947 case IGMP_HOST_MEMBERSHIP_REPORT:
948 case IGMPV2_HOST_MEMBERSHIP_REPORT:
949 /* Is it our report looped back? */
950 if (skb_rtable(skb)->fl.iif == 0)
952 /* don't rely on MC router hearing unicast reports */
953 if (skb->pkt_type == PACKET_MULTICAST ||
954 skb->pkt_type == PACKET_BROADCAST)
955 igmp_heard_report(in_dev, ih->group);
958 #ifdef CONFIG_IP_PIMSM_V1
960 return pim_rcv_v1(skb);
962 case IGMPV3_HOST_MEMBERSHIP_REPORT:
965 case IGMP_HOST_LEAVE_MESSAGE:
967 case IGMP_MTRACE_RESP:
984 * Add a filter to a device
987 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
989 char buf[MAX_ADDR_LEN];
990 struct net_device *dev = in_dev->dev;
992 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
993 We will get multicast token leakage, when IFF_MULTICAST
994 is changed. This check should be done in dev->set_multicast_list
995 routine. Something sort of:
996 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
999 if (arp_mc_map(addr, buf, dev, 0) == 0)
1000 dev_mc_add(dev, buf, dev->addr_len, 0);
1004 * Remove a filter from a device
1007 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1009 char buf[MAX_ADDR_LEN];
1010 struct net_device *dev = in_dev->dev;
1012 if (arp_mc_map(addr, buf, dev, 0) == 0)
1013 dev_mc_delete(dev, buf, dev->addr_len, 0);
1016 #ifdef CONFIG_IP_MULTICAST
1018 * deleted ip_mc_list manipulation
1020 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 struct ip_mc_list *pmc;
1024 /* this is an "ip_mc_list" for convenience; only the fields below
1025 * are actually used. In particular, the refcnt and users are not
1026 * used for management of the delete list. Using the same structure
1027 * for deleted items allows change reports to use common code with
1028 * non-deleted or query-response MCA's.
1030 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1033 spin_lock_bh(&im->lock);
1034 pmc->interface = im->interface;
1035 in_dev_hold(in_dev);
1036 pmc->multiaddr = im->multiaddr;
1037 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1038 IGMP_Unsolicited_Report_Count;
1039 pmc->sfmode = im->sfmode;
1040 if (pmc->sfmode == MCAST_INCLUDE) {
1041 struct ip_sf_list *psf;
1043 pmc->tomb = im->tomb;
1044 pmc->sources = im->sources;
1045 im->tomb = im->sources = NULL;
1046 for (psf=pmc->sources; psf; psf=psf->sf_next)
1047 psf->sf_crcount = pmc->crcount;
1049 spin_unlock_bh(&im->lock);
1051 spin_lock_bh(&in_dev->mc_tomb_lock);
1052 pmc->next = in_dev->mc_tomb;
1053 in_dev->mc_tomb = pmc;
1054 spin_unlock_bh(&in_dev->mc_tomb_lock);
1057 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1059 struct ip_mc_list *pmc, *pmc_prev;
1060 struct ip_sf_list *psf, *psf_next;
1062 spin_lock_bh(&in_dev->mc_tomb_lock);
1064 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1065 if (pmc->multiaddr == multiaddr)
1071 pmc_prev->next = pmc->next;
1073 in_dev->mc_tomb = pmc->next;
1075 spin_unlock_bh(&in_dev->mc_tomb_lock);
1077 for (psf=pmc->tomb; psf; psf=psf_next) {
1078 psf_next = psf->sf_next;
1081 in_dev_put(pmc->interface);
1086 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 struct ip_mc_list *pmc, *nextpmc;
1090 spin_lock_bh(&in_dev->mc_tomb_lock);
1091 pmc = in_dev->mc_tomb;
1092 in_dev->mc_tomb = NULL;
1093 spin_unlock_bh(&in_dev->mc_tomb_lock);
1095 for (; pmc; pmc = nextpmc) {
1096 nextpmc = pmc->next;
1097 ip_mc_clear_src(pmc);
1098 in_dev_put(pmc->interface);
1101 /* clear dead sources, too */
1102 read_lock(&in_dev->mc_list_lock);
1103 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1104 struct ip_sf_list *psf, *psf_next;
1106 spin_lock_bh(&pmc->lock);
1109 spin_unlock_bh(&pmc->lock);
1110 for (; psf; psf=psf_next) {
1111 psf_next = psf->sf_next;
1115 read_unlock(&in_dev->mc_list_lock);
1119 static void igmp_group_dropped(struct ip_mc_list *im)
1121 struct in_device *in_dev = im->interface;
1122 #ifdef CONFIG_IP_MULTICAST
1128 ip_mc_filter_del(in_dev, im->multiaddr);
1131 #ifdef CONFIG_IP_MULTICAST
1132 if (im->multiaddr == IGMP_ALL_HOSTS)
1135 reporter = im->reporter;
1136 igmp_stop_timer(im);
1138 if (!in_dev->dead) {
1139 if (IGMP_V1_SEEN(in_dev))
1141 if (IGMP_V2_SEEN(in_dev)) {
1143 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1147 igmpv3_add_delrec(in_dev, im);
1149 igmp_ifc_event(in_dev);
1153 ip_mc_clear_src(im);
1156 static void igmp_group_added(struct ip_mc_list *im)
1158 struct in_device *in_dev = im->interface;
1160 if (im->loaded == 0) {
1162 ip_mc_filter_add(in_dev, im->multiaddr);
1165 #ifdef CONFIG_IP_MULTICAST
1166 if (im->multiaddr == IGMP_ALL_HOSTS)
1171 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1172 spin_lock_bh(&im->lock);
1173 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1174 spin_unlock_bh(&im->lock);
1179 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1180 IGMP_Unsolicited_Report_Count;
1181 igmp_ifc_event(in_dev);
1187 * Multicast list managers
1192 * A socket has joined a multicast group on device dev.
1195 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1197 struct ip_mc_list *im;
1201 for (im=in_dev->mc_list; im; im=im->next) {
1202 if (im->multiaddr == addr) {
1204 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1209 im = kmalloc(sizeof(*im), GFP_KERNEL);
1214 im->interface = in_dev;
1215 in_dev_hold(in_dev);
1216 im->multiaddr = addr;
1217 /* initial mode is (EX, empty) */
1218 im->sfmode = MCAST_EXCLUDE;
1219 im->sfcount[MCAST_INCLUDE] = 0;
1220 im->sfcount[MCAST_EXCLUDE] = 1;
1224 atomic_set(&im->refcnt, 1);
1225 spin_lock_init(&im->lock);
1226 #ifdef CONFIG_IP_MULTICAST
1228 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1229 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1234 write_lock_bh(&in_dev->mc_list_lock);
1235 im->next = in_dev->mc_list;
1236 in_dev->mc_list = im;
1238 write_unlock_bh(&in_dev->mc_list_lock);
1239 #ifdef CONFIG_IP_MULTICAST
1240 igmpv3_del_delrec(in_dev, im->multiaddr);
1242 igmp_group_added(im);
1244 ip_rt_multicast_event(in_dev);
1250 * Resend IGMP JOIN report; used for bonding.
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1254 #ifdef CONFIG_IP_MULTICAST
1255 struct in_device *in_dev = im->interface;
1257 if (im->multiaddr == IGMP_ALL_HOSTS)
1260 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261 igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1265 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266 IGMP_Unsolicited_Report_Count;
1267 igmp_ifc_event(in_dev);
1272 * A socket has left a multicast group on device dev
1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1277 struct ip_mc_list *i, **ip;
1281 for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282 if (i->multiaddr == addr) {
1283 if (--i->users == 0) {
1284 write_lock_bh(&in_dev->mc_list_lock);
1287 write_unlock_bh(&in_dev->mc_list_lock);
1288 igmp_group_dropped(i);
1291 ip_rt_multicast_event(in_dev);
1301 /* Device changing type */
1303 void ip_mc_unmap(struct in_device *in_dev)
1305 struct ip_mc_list *i;
1309 for (i = in_dev->mc_list; i; i = i->next)
1310 igmp_group_dropped(i);
1313 void ip_mc_remap(struct in_device *in_dev)
1315 struct ip_mc_list *i;
1319 for (i = in_dev->mc_list; i; i = i->next)
1320 igmp_group_added(i);
1323 /* Device going down */
1325 void ip_mc_down(struct in_device *in_dev)
1327 struct ip_mc_list *i;
1331 for (i=in_dev->mc_list; i; i=i->next)
1332 igmp_group_dropped(i);
1334 #ifdef CONFIG_IP_MULTICAST
1335 in_dev->mr_ifc_count = 0;
1336 if (del_timer(&in_dev->mr_ifc_timer))
1337 __in_dev_put(in_dev);
1338 in_dev->mr_gq_running = 0;
1339 if (del_timer(&in_dev->mr_gq_timer))
1340 __in_dev_put(in_dev);
1341 igmpv3_clear_delrec(in_dev);
1344 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1347 void ip_mc_init_dev(struct in_device *in_dev)
1351 in_dev->mc_tomb = NULL;
1352 #ifdef CONFIG_IP_MULTICAST
1353 in_dev->mr_gq_running = 0;
1354 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1355 (unsigned long)in_dev);
1356 in_dev->mr_ifc_count = 0;
1357 in_dev->mc_count = 0;
1358 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1359 (unsigned long)in_dev);
1360 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1363 rwlock_init(&in_dev->mc_list_lock);
1364 spin_lock_init(&in_dev->mc_tomb_lock);
1367 /* Device going up */
1369 void ip_mc_up(struct in_device *in_dev)
1371 struct ip_mc_list *i;
1375 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1377 for (i=in_dev->mc_list; i; i=i->next)
1378 igmp_group_added(i);
1382 * Device is about to be destroyed: clean up.
1385 void ip_mc_destroy_dev(struct in_device *in_dev)
1387 struct ip_mc_list *i;
1391 /* Deactivate timers */
1394 write_lock_bh(&in_dev->mc_list_lock);
1395 while ((i = in_dev->mc_list) != NULL) {
1396 in_dev->mc_list = i->next;
1398 write_unlock_bh(&in_dev->mc_list_lock);
1399 igmp_group_dropped(i);
1402 write_lock_bh(&in_dev->mc_list_lock);
1404 write_unlock_bh(&in_dev->mc_list_lock);
1407 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1409 struct flowi fl = { .nl_u = { .ip4_u =
1410 { .daddr = imr->imr_multiaddr.s_addr } } };
1412 struct net_device *dev = NULL;
1413 struct in_device *idev = NULL;
1415 if (imr->imr_ifindex) {
1416 idev = inetdev_by_index(net, imr->imr_ifindex);
1421 if (imr->imr_address.s_addr) {
1422 dev = ip_dev_find(net, imr->imr_address.s_addr);
1428 if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1429 dev = rt->u.dst.dev;
1433 imr->imr_ifindex = dev->ifindex;
1434 idev = __in_dev_get_rtnl(dev);
1440 * Join a socket to a group
1442 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1443 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1446 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1449 struct ip_sf_list *psf, *psf_prev;
1453 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1454 if (psf->sf_inaddr == *psfsrc)
1458 if (!psf || psf->sf_count[sfmode] == 0) {
1459 /* source filter not found, or count wrong => bug */
1462 psf->sf_count[sfmode]--;
1463 if (psf->sf_count[sfmode] == 0) {
1464 ip_rt_multicast_event(pmc->interface);
1466 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1467 #ifdef CONFIG_IP_MULTICAST
1468 struct in_device *in_dev = pmc->interface;
1471 /* no more filters for this source */
1473 psf_prev->sf_next = psf->sf_next;
1475 pmc->sources = psf->sf_next;
1476 #ifdef CONFIG_IP_MULTICAST
1477 if (psf->sf_oldin &&
1478 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1479 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1480 IGMP_Unsolicited_Report_Count;
1481 psf->sf_next = pmc->tomb;
1491 #ifndef CONFIG_IP_MULTICAST
1492 #define igmp_ifc_event(x) do { } while (0)
1495 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1496 int sfcount, __be32 *psfsrc, int delta)
1498 struct ip_mc_list *pmc;
1504 read_lock(&in_dev->mc_list_lock);
1505 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1506 if (*pmca == pmc->multiaddr)
1510 /* MCA not found?? bug */
1511 read_unlock(&in_dev->mc_list_lock);
1514 spin_lock_bh(&pmc->lock);
1515 read_unlock(&in_dev->mc_list_lock);
1516 #ifdef CONFIG_IP_MULTICAST
1521 if (!pmc->sfcount[sfmode])
1523 pmc->sfcount[sfmode]--;
1526 for (i=0; i<sfcount; i++) {
1527 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1529 changerec |= rv > 0;
1533 if (pmc->sfmode == MCAST_EXCLUDE &&
1534 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1535 pmc->sfcount[MCAST_INCLUDE]) {
1536 #ifdef CONFIG_IP_MULTICAST
1537 struct ip_sf_list *psf;
1540 /* filter mode change */
1541 pmc->sfmode = MCAST_INCLUDE;
1542 #ifdef CONFIG_IP_MULTICAST
1543 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1544 IGMP_Unsolicited_Report_Count;
1545 in_dev->mr_ifc_count = pmc->crcount;
1546 for (psf=pmc->sources; psf; psf = psf->sf_next)
1547 psf->sf_crcount = 0;
1548 igmp_ifc_event(pmc->interface);
1549 } else if (sf_setstate(pmc) || changerec) {
1550 igmp_ifc_event(pmc->interface);
1554 spin_unlock_bh(&pmc->lock);
1559 * Add multicast single-source filter to the interface list
1561 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1562 __be32 *psfsrc, int delta)
1564 struct ip_sf_list *psf, *psf_prev;
1567 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1568 if (psf->sf_inaddr == *psfsrc)
1573 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1576 psf->sf_inaddr = *psfsrc;
1578 psf_prev->sf_next = psf;
1582 psf->sf_count[sfmode]++;
1583 if (psf->sf_count[sfmode] == 1) {
1584 ip_rt_multicast_event(pmc->interface);
1589 #ifdef CONFIG_IP_MULTICAST
1590 static void sf_markstate(struct ip_mc_list *pmc)
1592 struct ip_sf_list *psf;
1593 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1595 for (psf=pmc->sources; psf; psf=psf->sf_next)
1596 if (pmc->sfcount[MCAST_EXCLUDE]) {
1597 psf->sf_oldin = mca_xcount ==
1598 psf->sf_count[MCAST_EXCLUDE] &&
1599 !psf->sf_count[MCAST_INCLUDE];
1601 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1604 static int sf_setstate(struct ip_mc_list *pmc)
1606 struct ip_sf_list *psf, *dpsf;
1607 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1608 int qrv = pmc->interface->mr_qrv;
1612 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1613 if (pmc->sfcount[MCAST_EXCLUDE]) {
1614 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1615 !psf->sf_count[MCAST_INCLUDE];
1617 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1619 if (!psf->sf_oldin) {
1620 struct ip_sf_list *prev = NULL;
1622 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1623 if (dpsf->sf_inaddr == psf->sf_inaddr)
1629 prev->sf_next = dpsf->sf_next;
1631 pmc->tomb = dpsf->sf_next;
1634 psf->sf_crcount = qrv;
1637 } else if (psf->sf_oldin) {
1639 psf->sf_crcount = 0;
1641 * add or update "delete" records if an active filter
1644 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1645 if (dpsf->sf_inaddr == psf->sf_inaddr)
1648 dpsf = (struct ip_sf_list *)
1649 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1653 /* pmc->lock held by callers */
1654 dpsf->sf_next = pmc->tomb;
1657 dpsf->sf_crcount = qrv;
1666 * Add multicast source filter list to the interface list
1668 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1669 int sfcount, __be32 *psfsrc, int delta)
1671 struct ip_mc_list *pmc;
1677 read_lock(&in_dev->mc_list_lock);
1678 for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1679 if (*pmca == pmc->multiaddr)
1683 /* MCA not found?? bug */
1684 read_unlock(&in_dev->mc_list_lock);
1687 spin_lock_bh(&pmc->lock);
1688 read_unlock(&in_dev->mc_list_lock);
1690 #ifdef CONFIG_IP_MULTICAST
1693 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1695 pmc->sfcount[sfmode]++;
1697 for (i=0; i<sfcount; i++) {
1698 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1705 pmc->sfcount[sfmode]--;
1707 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1708 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1709 #ifdef CONFIG_IP_MULTICAST
1710 struct ip_sf_list *psf;
1711 in_dev = pmc->interface;
1714 /* filter mode change */
1715 if (pmc->sfcount[MCAST_EXCLUDE])
1716 pmc->sfmode = MCAST_EXCLUDE;
1717 else if (pmc->sfcount[MCAST_INCLUDE])
1718 pmc->sfmode = MCAST_INCLUDE;
1719 #ifdef CONFIG_IP_MULTICAST
1720 /* else no filters; keep old mode for reports */
1722 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1723 IGMP_Unsolicited_Report_Count;
1724 in_dev->mr_ifc_count = pmc->crcount;
1725 for (psf=pmc->sources; psf; psf = psf->sf_next)
1726 psf->sf_crcount = 0;
1727 igmp_ifc_event(in_dev);
1728 } else if (sf_setstate(pmc)) {
1729 igmp_ifc_event(in_dev);
1732 spin_unlock_bh(&pmc->lock);
1736 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1738 struct ip_sf_list *psf, *nextpsf;
1740 for (psf=pmc->tomb; psf; psf=nextpsf) {
1741 nextpsf = psf->sf_next;
1745 for (psf=pmc->sources; psf; psf=nextpsf) {
1746 nextpsf = psf->sf_next;
1749 pmc->sources = NULL;
1750 pmc->sfmode = MCAST_EXCLUDE;
1751 pmc->sfcount[MCAST_INCLUDE] = 0;
1752 pmc->sfcount[MCAST_EXCLUDE] = 1;
1757 * Join a multicast group
1759 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1762 __be32 addr = imr->imr_multiaddr.s_addr;
1763 struct ip_mc_socklist *iml = NULL, *i;
1764 struct in_device *in_dev;
1765 struct inet_sock *inet = inet_sk(sk);
1766 struct net *net = sock_net(sk);
1770 if (!ipv4_is_multicast(addr))
1775 in_dev = ip_mc_find_dev(net, imr);
1784 ifindex = imr->imr_ifindex;
1785 for (i = inet->mc_list; i; i = i->next) {
1786 if (i->multi.imr_multiaddr.s_addr == addr &&
1787 i->multi.imr_ifindex == ifindex)
1792 if (count >= sysctl_igmp_max_memberships)
1794 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1798 memcpy(&iml->multi, imr, sizeof(*imr));
1799 iml->next = inet->mc_list;
1801 iml->sfmode = MCAST_EXCLUDE;
1802 rcu_assign_pointer(inet->mc_list, iml);
1803 ip_mc_inc_group(in_dev, addr);
1810 static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1812 struct ip_sf_socklist *psf;
1814 psf = container_of(rp, struct ip_sf_socklist, rcu);
1815 /* sk_omem_alloc should have been decreased by the caller*/
1819 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1820 struct in_device *in_dev)
1822 struct ip_sf_socklist *psf = iml->sflist;
1826 /* any-source empty exclude case */
1827 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1828 iml->sfmode, 0, NULL, 0);
1830 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1831 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1832 rcu_assign_pointer(iml->sflist, NULL);
1833 /* decrease mem now to avoid the memleak warning */
1834 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1835 call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1840 static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1842 struct ip_mc_socklist *iml;
1844 iml = container_of(rp, struct ip_mc_socklist, rcu);
1845 /* sk_omem_alloc should have been decreased by the caller*/
1851 * Ask a socket to leave a group.
1854 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1856 struct inet_sock *inet = inet_sk(sk);
1857 struct ip_mc_socklist *iml, **imlp;
1858 struct in_device *in_dev;
1859 struct net *net = sock_net(sk);
1860 __be32 group = imr->imr_multiaddr.s_addr;
1862 int ret = -EADDRNOTAVAIL;
1865 in_dev = ip_mc_find_dev(net, imr);
1866 ifindex = imr->imr_ifindex;
1867 for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1868 if (iml->multi.imr_multiaddr.s_addr != group)
1871 if (iml->multi.imr_ifindex != ifindex)
1873 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1874 iml->multi.imr_address.s_addr)
1877 (void) ip_mc_leave_src(sk, iml, in_dev);
1879 rcu_assign_pointer(*imlp, iml->next);
1882 ip_mc_dec_group(in_dev, group);
1884 /* decrease mem now to avoid the memleak warning */
1885 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1886 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1895 int ip_mc_source(int add, int omode, struct sock *sk, struct
1896 ip_mreq_source *mreqs, int ifindex)
1899 struct ip_mreqn imr;
1900 __be32 addr = mreqs->imr_multiaddr;
1901 struct ip_mc_socklist *pmc;
1902 struct in_device *in_dev = NULL;
1903 struct inet_sock *inet = inet_sk(sk);
1904 struct ip_sf_socklist *psl;
1905 struct net *net = sock_net(sk);
1909 if (!ipv4_is_multicast(addr))
1914 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1915 imr.imr_address.s_addr = mreqs->imr_interface;
1916 imr.imr_ifindex = ifindex;
1917 in_dev = ip_mc_find_dev(net, &imr);
1923 err = -EADDRNOTAVAIL;
1925 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1926 if ((pmc->multi.imr_multiaddr.s_addr ==
1927 imr.imr_multiaddr.s_addr) &&
1928 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1931 if (!pmc) { /* must have a prior join */
1935 /* if a source filter was set, must be the same mode as before */
1937 if (pmc->sfmode != omode) {
1941 } else if (pmc->sfmode != omode) {
1942 /* allow mode switches for empty-set filters */
1943 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1944 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1946 pmc->sfmode = omode;
1952 goto done; /* err = -EADDRNOTAVAIL */
1954 for (i=0; i<psl->sl_count; i++) {
1955 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1960 if (rv) /* source not found */
1961 goto done; /* err = -EADDRNOTAVAIL */
1963 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1964 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1969 /* update the interface filter */
1970 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1971 &mreqs->imr_sourceaddr, 1);
1973 for (j=i+1; j<psl->sl_count; j++)
1974 psl->sl_addr[j-1] = psl->sl_addr[j];
1979 /* else, add a new source to the filter */
1981 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1985 if (!psl || psl->sl_count == psl->sl_max) {
1986 struct ip_sf_socklist *newpsl;
1987 int count = IP_SFBLOCK;
1990 count += psl->sl_max;
1991 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1996 newpsl->sl_max = count;
1997 newpsl->sl_count = count - IP_SFBLOCK;
1999 for (i=0; i<psl->sl_count; i++)
2000 newpsl->sl_addr[i] = psl->sl_addr[i];
2001 /* decrease mem now to avoid the memleak warning */
2002 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2003 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2005 rcu_assign_pointer(pmc->sflist, newpsl);
2008 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2009 for (i=0; i<psl->sl_count; i++) {
2010 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2015 if (rv == 0) /* address already there is an error */
2017 for (j=psl->sl_count-1; j>=i; j--)
2018 psl->sl_addr[j+1] = psl->sl_addr[j];
2019 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2022 /* update the interface list */
2023 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2024 &mreqs->imr_sourceaddr, 1);
2028 return ip_mc_leave_group(sk, &imr);
2032 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2035 struct ip_mreqn imr;
2036 __be32 addr = msf->imsf_multiaddr;
2037 struct ip_mc_socklist *pmc;
2038 struct in_device *in_dev;
2039 struct inet_sock *inet = inet_sk(sk);
2040 struct ip_sf_socklist *newpsl, *psl;
2041 struct net *net = sock_net(sk);
2044 if (!ipv4_is_multicast(addr))
2046 if (msf->imsf_fmode != MCAST_INCLUDE &&
2047 msf->imsf_fmode != MCAST_EXCLUDE)
2052 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2053 imr.imr_address.s_addr = msf->imsf_interface;
2054 imr.imr_ifindex = ifindex;
2055 in_dev = ip_mc_find_dev(net, &imr);
2062 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2063 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2068 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2069 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2070 pmc->multi.imr_ifindex == imr.imr_ifindex)
2073 if (!pmc) { /* must have a prior join */
2077 if (msf->imsf_numsrc) {
2078 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2084 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2085 memcpy(newpsl->sl_addr, msf->imsf_slist,
2086 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2087 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2088 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2090 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2095 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2096 msf->imsf_fmode, 0, NULL, 0);
2100 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2101 psl->sl_count, psl->sl_addr, 0);
2102 /* decrease mem now to avoid the memleak warning */
2103 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2104 call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2106 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2108 rcu_assign_pointer(pmc->sflist, newpsl);
2109 pmc->sfmode = msf->imsf_fmode;
2114 err = ip_mc_leave_group(sk, &imr);
2118 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2119 struct ip_msfilter __user *optval, int __user *optlen)
2121 int err, len, count, copycount;
2122 struct ip_mreqn imr;
2123 __be32 addr = msf->imsf_multiaddr;
2124 struct ip_mc_socklist *pmc;
2125 struct in_device *in_dev;
2126 struct inet_sock *inet = inet_sk(sk);
2127 struct ip_sf_socklist *psl;
2128 struct net *net = sock_net(sk);
2130 if (!ipv4_is_multicast(addr))
2135 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2136 imr.imr_address.s_addr = msf->imsf_interface;
2137 imr.imr_ifindex = 0;
2138 in_dev = ip_mc_find_dev(net, &imr);
2144 err = -EADDRNOTAVAIL;
2146 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2147 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2148 pmc->multi.imr_ifindex == imr.imr_ifindex)
2151 if (!pmc) /* must have a prior join */
2153 msf->imsf_fmode = pmc->sfmode;
2160 count = psl->sl_count;
2162 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2163 len = copycount * sizeof(psl->sl_addr[0]);
2164 msf->imsf_numsrc = count;
2165 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2166 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2170 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2178 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2179 struct group_filter __user *optval, int __user *optlen)
2181 int err, i, count, copycount;
2182 struct sockaddr_in *psin;
2184 struct ip_mc_socklist *pmc;
2185 struct inet_sock *inet = inet_sk(sk);
2186 struct ip_sf_socklist *psl;
2188 psin = (struct sockaddr_in *)&gsf->gf_group;
2189 if (psin->sin_family != AF_INET)
2191 addr = psin->sin_addr.s_addr;
2192 if (!ipv4_is_multicast(addr))
2197 err = -EADDRNOTAVAIL;
2199 for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2200 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2201 pmc->multi.imr_ifindex == gsf->gf_interface)
2204 if (!pmc) /* must have a prior join */
2206 gsf->gf_fmode = pmc->sfmode;
2209 count = psl ? psl->sl_count : 0;
2210 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2211 gsf->gf_numsrc = count;
2212 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2213 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2216 for (i=0; i<copycount; i++) {
2217 struct sockaddr_storage ss;
2219 psin = (struct sockaddr_in *)&ss;
2220 memset(&ss, 0, sizeof(ss));
2221 psin->sin_family = AF_INET;
2222 psin->sin_addr.s_addr = psl->sl_addr[i];
2223 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2233 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2235 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2237 struct inet_sock *inet = inet_sk(sk);
2238 struct ip_mc_socklist *pmc;
2239 struct ip_sf_socklist *psl;
2244 if (!ipv4_is_multicast(loc_addr))
2248 for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
2249 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2250 pmc->multi.imr_ifindex == dif)
2257 ret = (pmc->sfmode == MCAST_EXCLUDE);
2261 for (i=0; i<psl->sl_count; i++) {
2262 if (psl->sl_addr[i] == rmt_addr)
2266 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2268 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2278 * A socket is closing.
2281 void ip_mc_drop_socket(struct sock *sk)
2283 struct inet_sock *inet = inet_sk(sk);
2284 struct ip_mc_socklist *iml;
2285 struct net *net = sock_net(sk);
2287 if (inet->mc_list == NULL)
2291 while ((iml = inet->mc_list) != NULL) {
2292 struct in_device *in_dev;
2293 rcu_assign_pointer(inet->mc_list, iml->next);
2295 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2296 (void) ip_mc_leave_src(sk, iml, in_dev);
2297 if (in_dev != NULL) {
2298 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2301 /* decrease mem now to avoid the memleak warning */
2302 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2303 call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2308 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2310 struct ip_mc_list *im;
2311 struct ip_sf_list *psf;
2314 read_lock(&in_dev->mc_list_lock);
2315 for (im=in_dev->mc_list; im; im=im->next) {
2316 if (im->multiaddr == mc_addr)
2319 if (im && proto == IPPROTO_IGMP) {
2323 for (psf=im->sources; psf; psf=psf->sf_next) {
2324 if (psf->sf_inaddr == src_addr)
2328 rv = psf->sf_count[MCAST_INCLUDE] ||
2329 psf->sf_count[MCAST_EXCLUDE] !=
2330 im->sfcount[MCAST_EXCLUDE];
2332 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2334 rv = 1; /* unspecified source; tentatively allow */
2336 read_unlock(&in_dev->mc_list_lock);
2340 #if defined(CONFIG_PROC_FS)
2341 struct igmp_mc_iter_state {
2342 struct seq_net_private p;
2343 struct net_device *dev;
2344 struct in_device *in_dev;
2347 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2349 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2351 struct net *net = seq_file_net(seq);
2352 struct ip_mc_list *im = NULL;
2353 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2355 state->in_dev = NULL;
2356 for_each_netdev_rcu(net, state->dev) {
2357 struct in_device *in_dev;
2359 in_dev = __in_dev_get_rcu(state->dev);
2362 read_lock(&in_dev->mc_list_lock);
2363 im = in_dev->mc_list;
2365 state->in_dev = in_dev;
2368 read_unlock(&in_dev->mc_list_lock);
2373 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2375 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2378 if (likely(state->in_dev != NULL))
2379 read_unlock(&state->in_dev->mc_list_lock);
2381 state->dev = next_net_device_rcu(state->dev);
2383 state->in_dev = NULL;
2386 state->in_dev = __in_dev_get_rcu(state->dev);
2389 read_lock(&state->in_dev->mc_list_lock);
2390 im = state->in_dev->mc_list;
2395 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2397 struct ip_mc_list *im = igmp_mc_get_first(seq);
2399 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2401 return pos ? NULL : im;
2404 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2408 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2411 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2413 struct ip_mc_list *im;
2414 if (v == SEQ_START_TOKEN)
2415 im = igmp_mc_get_first(seq);
2417 im = igmp_mc_get_next(seq, v);
2422 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2425 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2426 if (likely(state->in_dev != NULL)) {
2427 read_unlock(&state->in_dev->mc_list_lock);
2428 state->in_dev = NULL;
2434 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2436 if (v == SEQ_START_TOKEN)
2438 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2440 struct ip_mc_list *im = (struct ip_mc_list *)v;
2441 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2443 #ifdef CONFIG_IP_MULTICAST
2444 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2445 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2451 if (state->in_dev->mc_list == im) {
2452 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2453 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2457 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2458 im->multiaddr, im->users,
2459 im->tm_running, im->tm_running ?
2460 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2466 static const struct seq_operations igmp_mc_seq_ops = {
2467 .start = igmp_mc_seq_start,
2468 .next = igmp_mc_seq_next,
2469 .stop = igmp_mc_seq_stop,
2470 .show = igmp_mc_seq_show,
2473 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2475 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2476 sizeof(struct igmp_mc_iter_state));
2479 static const struct file_operations igmp_mc_seq_fops = {
2480 .owner = THIS_MODULE,
2481 .open = igmp_mc_seq_open,
2483 .llseek = seq_lseek,
2484 .release = seq_release_net,
2487 struct igmp_mcf_iter_state {
2488 struct seq_net_private p;
2489 struct net_device *dev;
2490 struct in_device *idev;
2491 struct ip_mc_list *im;
2494 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2496 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2498 struct net *net = seq_file_net(seq);
2499 struct ip_sf_list *psf = NULL;
2500 struct ip_mc_list *im = NULL;
2501 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2505 for_each_netdev_rcu(net, state->dev) {
2506 struct in_device *idev;
2507 idev = __in_dev_get_rcu(state->dev);
2508 if (unlikely(idev == NULL))
2510 read_lock(&idev->mc_list_lock);
2512 if (likely(im != NULL)) {
2513 spin_lock_bh(&im->lock);
2515 if (likely(psf != NULL)) {
2520 spin_unlock_bh(&im->lock);
2522 read_unlock(&idev->mc_list_lock);
2527 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2529 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2533 spin_unlock_bh(&state->im->lock);
2534 state->im = state->im->next;
2535 while (!state->im) {
2536 if (likely(state->idev != NULL))
2537 read_unlock(&state->idev->mc_list_lock);
2539 state->dev = next_net_device_rcu(state->dev);
2544 state->idev = __in_dev_get_rcu(state->dev);
2547 read_lock(&state->idev->mc_list_lock);
2548 state->im = state->idev->mc_list;
2552 spin_lock_bh(&state->im->lock);
2553 psf = state->im->sources;
2559 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565 return pos ? NULL : psf;
2568 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2572 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2575 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577 struct ip_sf_list *psf;
2578 if (v == SEQ_START_TOKEN)
2579 psf = igmp_mcf_get_first(seq);
2581 psf = igmp_mcf_get_next(seq, v);
2586 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2589 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2590 if (likely(state->im != NULL)) {
2591 spin_unlock_bh(&state->im->lock);
2594 if (likely(state->idev != NULL)) {
2595 read_unlock(&state->idev->mc_list_lock);
2602 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2604 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2605 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2607 if (v == SEQ_START_TOKEN) {
2610 "%10s %10s %6s %6s\n", "Idx",
2612 "SRC", "INC", "EXC");
2616 "0x%08x %6lu %6lu\n",
2617 state->dev->ifindex, state->dev->name,
2618 ntohl(state->im->multiaddr),
2619 ntohl(psf->sf_inaddr),
2620 psf->sf_count[MCAST_INCLUDE],
2621 psf->sf_count[MCAST_EXCLUDE]);
2626 static const struct seq_operations igmp_mcf_seq_ops = {
2627 .start = igmp_mcf_seq_start,
2628 .next = igmp_mcf_seq_next,
2629 .stop = igmp_mcf_seq_stop,
2630 .show = igmp_mcf_seq_show,
2633 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2635 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2636 sizeof(struct igmp_mcf_iter_state));
2639 static const struct file_operations igmp_mcf_seq_fops = {
2640 .owner = THIS_MODULE,
2641 .open = igmp_mcf_seq_open,
2643 .llseek = seq_lseek,
2644 .release = seq_release_net,
2647 static int __net_init igmp_net_init(struct net *net)
2649 struct proc_dir_entry *pde;
2651 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2654 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2660 proc_net_remove(net, "igmp");
2665 static void __net_exit igmp_net_exit(struct net *net)
2667 proc_net_remove(net, "mcfilter");
2668 proc_net_remove(net, "igmp");
2671 static struct pernet_operations igmp_net_ops = {
2672 .init = igmp_net_init,
2673 .exit = igmp_net_exit,
2676 int __init igmp_mc_proc_init(void)
2678 return register_pernet_subsys(&igmp_net_ops);
2682 EXPORT_SYMBOL(ip_mc_dec_group);
2683 EXPORT_SYMBOL(ip_mc_inc_group);
2684 EXPORT_SYMBOL(ip_mc_join_group);
2685 EXPORT_SYMBOL(ip_mc_rejoin_group);