2 * Linux NET3: Internet Group Management Protocol [IGMP]
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
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 #define for_each_pmc_rcu(in_dev, pmc) \
160 for (pmc = rcu_dereference(in_dev->mc_list); \
162 pmc = rcu_dereference(pmc->next_rcu))
164 #define for_each_pmc_rtnl(in_dev, pmc) \
165 for (pmc = rtnl_dereference(in_dev->mc_list); \
167 pmc = rtnl_dereference(pmc->next_rcu))
169 #ifdef CONFIG_IP_MULTICAST
175 static void igmp_stop_timer(struct ip_mc_list *im)
177 spin_lock_bh(&im->lock);
178 if (del_timer(&im->timer))
179 atomic_dec(&im->refcnt);
182 im->unsolicit_count = 0;
183 spin_unlock_bh(&im->lock);
186 /* It must be called with locked im->lock */
187 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
189 int tv = net_random() % max_delay;
192 if (!mod_timer(&im->timer, jiffies+tv+2))
193 atomic_inc(&im->refcnt);
196 static void igmp_gq_start_timer(struct in_device *in_dev)
198 int tv = net_random() % in_dev->mr_maxdelay;
200 in_dev->mr_gq_running = 1;
201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
205 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
207 int tv = net_random() % delay;
209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
213 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
215 spin_lock_bh(&im->lock);
216 im->unsolicit_count = 0;
217 if (del_timer(&im->timer)) {
218 if ((long)(im->timer.expires-jiffies) < max_delay) {
219 add_timer(&im->timer);
221 spin_unlock_bh(&im->lock);
224 atomic_dec(&im->refcnt);
226 igmp_start_timer(im, max_delay);
227 spin_unlock_bh(&im->lock);
232 * Send an IGMP report.
235 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
238 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
239 int gdeleted, int sdeleted)
242 case IGMPV3_MODE_IS_INCLUDE:
243 case IGMPV3_MODE_IS_EXCLUDE:
244 if (gdeleted || sdeleted)
246 if (!(pmc->gsquery && !psf->sf_gsresp)) {
247 if (pmc->sfmode == MCAST_INCLUDE)
249 /* don't include if this source is excluded
252 if (psf->sf_count[MCAST_INCLUDE])
253 return type == IGMPV3_MODE_IS_INCLUDE;
254 return pmc->sfcount[MCAST_EXCLUDE] ==
255 psf->sf_count[MCAST_EXCLUDE];
258 case IGMPV3_CHANGE_TO_INCLUDE:
259 if (gdeleted || sdeleted)
261 return psf->sf_count[MCAST_INCLUDE] != 0;
262 case IGMPV3_CHANGE_TO_EXCLUDE:
263 if (gdeleted || sdeleted)
265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
266 psf->sf_count[MCAST_INCLUDE])
268 return pmc->sfcount[MCAST_EXCLUDE] ==
269 psf->sf_count[MCAST_EXCLUDE];
270 case IGMPV3_ALLOW_NEW_SOURCES:
271 if (gdeleted || !psf->sf_crcount)
273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
274 case IGMPV3_BLOCK_OLD_SOURCES:
275 if (pmc->sfmode == MCAST_INCLUDE)
276 return gdeleted || (psf->sf_crcount && sdeleted);
277 return psf->sf_crcount && !gdeleted && !sdeleted;
283 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
285 struct ip_sf_list *psf;
288 for (psf=pmc->sources; psf; psf=psf->sf_next) {
289 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
296 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
298 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
303 struct igmpv3_report *pig;
304 struct net *net = dev_net(dev);
306 int hlen = LL_RESERVED_SPACE(dev);
307 int tlen = dev->needed_tailroom;
310 skb = alloc_skb(size + hlen + tlen,
311 GFP_ATOMIC | __GFP_NOWARN);
318 igmp_skb_size(skb) = size;
320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
322 IPPROTO_IGMP, 0, dev->ifindex);
328 skb_dst_set(skb, &rt->dst);
331 skb_reserve(skb, hlen);
333 skb_reset_network_header(skb);
335 skb_put(skb, sizeof(struct iphdr) + 4);
338 pip->ihl = (sizeof(struct iphdr)+4)>>2;
340 pip->frag_off = htons(IP_DF);
342 pip->daddr = fl4.daddr;
343 pip->saddr = fl4.saddr;
344 pip->protocol = IPPROTO_IGMP;
345 pip->tot_len = 0; /* filled in later */
346 ip_select_ident(pip, &rt->dst, NULL);
347 ((u8*)&pip[1])[0] = IPOPT_RA;
348 ((u8*)&pip[1])[1] = 4;
349 ((u8*)&pip[1])[2] = 0;
350 ((u8*)&pip[1])[3] = 0;
352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
353 skb_put(skb, sizeof(*pig));
354 pig = igmpv3_report_hdr(skb);
355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
363 static int igmpv3_sendpack(struct sk_buff *skb)
365 struct igmphdr *pig = igmp_hdr(skb);
366 const int igmplen = skb->tail - skb->transport_header;
368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
370 return ip_local_out(skb);
373 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
378 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, struct igmpv3_grec **ppgr)
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr;
386 skb = igmpv3_newpack(dev, dev->mtu);
389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
390 pgr->grec_type = type;
391 pgr->grec_auxwords = 0;
393 pgr->grec_mca = pmc->multiaddr;
394 pih = igmpv3_report_hdr(skb);
395 pih->ngrec = htons(ntohs(pih->ngrec)+1);
400 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
401 skb_tailroom(skb)) : 0)
403 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
404 int type, int gdeleted, int sdeleted)
406 struct net_device *dev = pmc->interface->dev;
407 struct igmpv3_report *pih;
408 struct igmpv3_grec *pgr = NULL;
409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
410 int scount, stotal, first, isquery, truncate;
412 if (pmc->multiaddr == IGMP_ALL_HOSTS)
415 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
416 type == IGMPV3_MODE_IS_EXCLUDE;
417 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
418 type == IGMPV3_CHANGE_TO_EXCLUDE;
422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
427 pih = skb ? igmpv3_report_hdr(skb) : NULL;
429 /* EX and TO_EX get a fresh packet, if needed */
431 if (pih && pih->ngrec &&
432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
434 igmpv3_sendpack(skb);
435 skb = igmpv3_newpack(dev, dev->mtu);
440 for (psf=*psf_list; psf; psf=psf_next) {
443 psf_next = psf->sf_next;
445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
450 /* clear marks on query responses */
454 if (AVAILABLE(skb) < sizeof(__be32) +
455 first*sizeof(struct igmpv3_grec)) {
456 if (truncate && !first)
457 break; /* truncate these */
459 pgr->grec_nsrcs = htons(scount);
461 igmpv3_sendpack(skb);
462 skb = igmpv3_newpack(dev, dev->mtu);
467 skb = add_grhead(skb, pmc, type, &pgr);
472 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
473 *psrc = psf->sf_inaddr;
475 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
480 psf_prev->sf_next = psf->sf_next;
482 *psf_list = psf->sf_next;
492 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
493 type == IGMPV3_BLOCK_OLD_SOURCES)
495 if (pmc->crcount || isquery) {
496 /* make sure we have room for group header */
497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
498 igmpv3_sendpack(skb);
499 skb = NULL; /* add_grhead will get a new one */
501 skb = add_grhead(skb, pmc, type, &pgr);
505 pgr->grec_nsrcs = htons(scount);
508 pmc->gsquery = 0; /* clear query state on report */
512 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
514 struct sk_buff *skb = NULL;
519 for_each_pmc_rcu(in_dev, pmc) {
520 if (pmc->multiaddr == IGMP_ALL_HOSTS)
522 spin_lock_bh(&pmc->lock);
523 if (pmc->sfcount[MCAST_EXCLUDE])
524 type = IGMPV3_MODE_IS_EXCLUDE;
526 type = IGMPV3_MODE_IS_INCLUDE;
527 skb = add_grec(skb, pmc, type, 0, 0);
528 spin_unlock_bh(&pmc->lock);
532 spin_lock_bh(&pmc->lock);
533 if (pmc->sfcount[MCAST_EXCLUDE])
534 type = IGMPV3_MODE_IS_EXCLUDE;
536 type = IGMPV3_MODE_IS_INCLUDE;
537 skb = add_grec(skb, pmc, type, 0, 0);
538 spin_unlock_bh(&pmc->lock);
542 return igmpv3_sendpack(skb);
546 * remove zero-count source records from a source filter list
548 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
550 struct ip_sf_list *psf_prev, *psf_next, *psf;
553 for (psf=*ppsf; psf; psf = psf_next) {
554 psf_next = psf->sf_next;
555 if (psf->sf_crcount == 0) {
557 psf_prev->sf_next = psf->sf_next;
559 *ppsf = psf->sf_next;
566 static void igmpv3_send_cr(struct in_device *in_dev)
568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
569 struct sk_buff *skb = NULL;
573 spin_lock_bh(&in_dev->mc_tomb_lock);
577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
578 pmc_next = pmc->next;
579 if (pmc->sfmode == MCAST_INCLUDE) {
580 type = IGMPV3_BLOCK_OLD_SOURCES;
581 dtype = IGMPV3_BLOCK_OLD_SOURCES;
582 skb = add_grec(skb, pmc, type, 1, 0);
583 skb = add_grec(skb, pmc, dtype, 1, 1);
586 if (pmc->sfmode == MCAST_EXCLUDE) {
587 type = IGMPV3_CHANGE_TO_INCLUDE;
588 skb = add_grec(skb, pmc, type, 1, 0);
591 if (pmc->crcount == 0) {
592 igmpv3_clear_zeros(&pmc->tomb);
593 igmpv3_clear_zeros(&pmc->sources);
596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
598 pmc_prev->next = pmc_next;
600 in_dev->mc_tomb = pmc_next;
601 in_dev_put(pmc->interface);
606 spin_unlock_bh(&in_dev->mc_tomb_lock);
609 for_each_pmc_rcu(in_dev, pmc) {
610 spin_lock_bh(&pmc->lock);
611 if (pmc->sfcount[MCAST_EXCLUDE]) {
612 type = IGMPV3_BLOCK_OLD_SOURCES;
613 dtype = IGMPV3_ALLOW_NEW_SOURCES;
615 type = IGMPV3_ALLOW_NEW_SOURCES;
616 dtype = IGMPV3_BLOCK_OLD_SOURCES;
618 skb = add_grec(skb, pmc, type, 0, 0);
619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
621 /* filter mode changes */
623 if (pmc->sfmode == MCAST_EXCLUDE)
624 type = IGMPV3_CHANGE_TO_EXCLUDE;
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 0, 0);
630 spin_unlock_bh(&pmc->lock);
636 (void) igmpv3_sendpack(skb);
639 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
646 struct net_device *dev = in_dev->dev;
647 struct net *net = dev_net(dev);
648 __be32 group = pmc ? pmc->multiaddr : 0;
653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
654 return igmpv3_send_report(in_dev, pmc);
655 else if (type == IGMP_HOST_LEAVE_MESSAGE)
656 dst = IGMP_ALL_ROUTER;
660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
662 IPPROTO_IGMP, 0, dev->ifindex);
666 hlen = LL_RESERVED_SPACE(dev);
667 tlen = dev->needed_tailroom;
668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
674 skb_dst_set(skb, &rt->dst);
676 skb_reserve(skb, hlen);
678 skb_reset_network_header(skb);
680 skb_put(skb, sizeof(struct iphdr) + 4);
683 iph->ihl = (sizeof(struct iphdr)+4)>>2;
685 iph->frag_off = htons(IP_DF);
688 iph->saddr = fl4.saddr;
689 iph->protocol = IPPROTO_IGMP;
690 ip_select_ident(iph, &rt->dst, NULL);
691 ((u8*)&iph[1])[0] = IPOPT_RA;
692 ((u8*)&iph[1])[1] = 4;
693 ((u8*)&iph[1])[2] = 0;
694 ((u8*)&iph[1])[3] = 0;
696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
703 return ip_local_out(skb);
706 static void igmp_gq_timer_expire(unsigned long data)
708 struct in_device *in_dev = (struct in_device *)data;
710 in_dev->mr_gq_running = 0;
711 igmpv3_send_report(in_dev, NULL);
712 __in_dev_put(in_dev);
715 static void igmp_ifc_timer_expire(unsigned long data)
717 struct in_device *in_dev = (struct in_device *)data;
719 igmpv3_send_cr(in_dev);
720 if (in_dev->mr_ifc_count) {
721 in_dev->mr_ifc_count--;
722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
724 __in_dev_put(in_dev);
727 static void igmp_ifc_event(struct in_device *in_dev)
729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
732 IGMP_Unsolicited_Report_Count;
733 igmp_ifc_start_timer(in_dev, 1);
737 static void igmp_timer_expire(unsigned long data)
739 struct ip_mc_list *im=(struct ip_mc_list *)data;
740 struct in_device *in_dev = im->interface;
742 spin_lock(&im->lock);
745 if (im->unsolicit_count) {
746 im->unsolicit_count--;
747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
750 spin_unlock(&im->lock);
752 if (IGMP_V1_SEEN(in_dev))
753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
754 else if (IGMP_V2_SEEN(in_dev))
755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
762 /* mark EXCLUDE-mode sources */
763 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
765 struct ip_sf_list *psf;
769 for (psf=pmc->sources; psf; psf=psf->sf_next) {
772 for (i=0; i<nsrcs; i++) {
773 /* skip inactive filters */
774 if (psf->sf_count[MCAST_INCLUDE] ||
775 pmc->sfcount[MCAST_EXCLUDE] !=
776 psf->sf_count[MCAST_EXCLUDE])
778 if (srcs[i] == psf->sf_inaddr) {
785 if (scount == nsrcs) /* all sources excluded */
790 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
792 struct ip_sf_list *psf;
795 if (pmc->sfmode == MCAST_EXCLUDE)
796 return igmp_xmarksources(pmc, nsrcs, srcs);
798 /* mark INCLUDE-mode sources */
800 for (psf=pmc->sources; psf; psf=psf->sf_next) {
803 for (i=0; i<nsrcs; i++)
804 if (srcs[i] == psf->sf_inaddr) {
818 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
820 struct ip_mc_list *im;
822 /* Timers are only set for non-local groups */
824 if (group == IGMP_ALL_HOSTS)
828 for_each_pmc_rcu(in_dev, im) {
829 if (im->multiaddr == group) {
837 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
840 struct igmphdr *ih = igmp_hdr(skb);
841 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
842 struct ip_mc_list *im;
843 __be32 group = ih->group;
850 /* Alas, old v1 router presents here. */
852 max_delay = IGMP_Query_Response_Interval;
853 in_dev->mr_v1_seen = jiffies +
854 IGMP_V1_Router_Present_Timeout;
857 /* v2 router present */
858 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
859 in_dev->mr_v2_seen = jiffies +
860 IGMP_V2_Router_Present_Timeout;
862 /* cancel the interface change timer */
863 in_dev->mr_ifc_count = 0;
864 if (del_timer(&in_dev->mr_ifc_timer))
865 __in_dev_put(in_dev);
866 /* clear deleted report items */
867 igmpv3_clear_delrec(in_dev);
868 } else if (len < 12) {
869 return; /* ignore bogus packet; freed by caller */
870 } else if (IGMP_V1_SEEN(in_dev)) {
871 /* This is a v3 query with v1 queriers present */
872 max_delay = IGMP_Query_Response_Interval;
874 } else if (IGMP_V2_SEEN(in_dev)) {
875 /* this is a v3 query with v2 queriers present;
876 * Interpretation of the max_delay code is problematic here.
877 * A real v2 host would use ih_code directly, while v3 has a
878 * different encoding. We use the v3 encoding as more likely
879 * to be intended in a v3 query.
881 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
883 max_delay = 1; /* can't mod w/ 0 */
885 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
888 ih3 = igmpv3_query_hdr(skb);
890 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
891 + ntohs(ih3->nsrcs)*sizeof(__be32)))
893 ih3 = igmpv3_query_hdr(skb);
896 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
898 max_delay = 1; /* can't mod w/ 0 */
899 in_dev->mr_maxdelay = max_delay;
901 in_dev->mr_qrv = ih3->qrv;
902 if (!group) { /* general query */
904 return; /* no sources allowed */
905 igmp_gq_start_timer(in_dev);
908 /* mark sources to include, if group & source-specific */
909 mark = ih3->nsrcs != 0;
913 * - Start the timers in all of our membership records
914 * that the query applies to for the interface on
915 * which the query arrived excl. those that belong
916 * to a "local" group (224.0.0.X)
917 * - For timers already running check if they need to
919 * - Use the igmp->igmp_code field as the maximum
923 for_each_pmc_rcu(in_dev, im) {
926 if (group && group != im->multiaddr)
928 if (im->multiaddr == IGMP_ALL_HOSTS)
930 spin_lock_bh(&im->lock);
932 im->gsquery = im->gsquery && mark;
935 changed = !im->gsquery ||
936 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
937 spin_unlock_bh(&im->lock);
939 igmp_mod_timer(im, max_delay);
944 /* called in rcu_read_lock() section */
945 int igmp_rcv(struct sk_buff *skb)
947 /* This basically follows the spec line by line -- see RFC1112 */
949 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
955 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
958 switch (skb->ip_summed) {
959 case CHECKSUM_COMPLETE:
960 if (!csum_fold(skb->csum))
965 if (__skb_checksum_complete(skb))
971 case IGMP_HOST_MEMBERSHIP_QUERY:
972 igmp_heard_query(in_dev, skb, len);
974 case IGMP_HOST_MEMBERSHIP_REPORT:
975 case IGMPV2_HOST_MEMBERSHIP_REPORT:
976 /* Is it our report looped back? */
977 if (rt_is_output_route(skb_rtable(skb)))
979 /* don't rely on MC router hearing unicast reports */
980 if (skb->pkt_type == PACKET_MULTICAST ||
981 skb->pkt_type == PACKET_BROADCAST)
982 igmp_heard_report(in_dev, ih->group);
985 #ifdef CONFIG_IP_PIMSM_V1
986 return pim_rcv_v1(skb);
988 case IGMPV3_HOST_MEMBERSHIP_REPORT:
991 case IGMP_HOST_LEAVE_MESSAGE:
993 case IGMP_MTRACE_RESP:
1008 * Add a filter to a device
1011 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1013 char buf[MAX_ADDR_LEN];
1014 struct net_device *dev = in_dev->dev;
1016 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1017 We will get multicast token leakage, when IFF_MULTICAST
1018 is changed. This check should be done in ndo_set_rx_mode
1019 routine. Something sort of:
1020 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1023 if (arp_mc_map(addr, buf, dev, 0) == 0)
1024 dev_mc_add(dev, buf);
1028 * Remove a filter from a device
1031 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1033 char buf[MAX_ADDR_LEN];
1034 struct net_device *dev = in_dev->dev;
1036 if (arp_mc_map(addr, buf, dev, 0) == 0)
1037 dev_mc_del(dev, buf);
1040 #ifdef CONFIG_IP_MULTICAST
1042 * deleted ip_mc_list manipulation
1044 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1046 struct ip_mc_list *pmc;
1048 /* this is an "ip_mc_list" for convenience; only the fields below
1049 * are actually used. In particular, the refcnt and users are not
1050 * used for management of the delete list. Using the same structure
1051 * for deleted items allows change reports to use common code with
1052 * non-deleted or query-response MCA's.
1054 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1057 spin_lock_bh(&im->lock);
1058 pmc->interface = im->interface;
1059 in_dev_hold(in_dev);
1060 pmc->multiaddr = im->multiaddr;
1061 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1062 IGMP_Unsolicited_Report_Count;
1063 pmc->sfmode = im->sfmode;
1064 if (pmc->sfmode == MCAST_INCLUDE) {
1065 struct ip_sf_list *psf;
1067 pmc->tomb = im->tomb;
1068 pmc->sources = im->sources;
1069 im->tomb = im->sources = NULL;
1070 for (psf=pmc->sources; psf; psf=psf->sf_next)
1071 psf->sf_crcount = pmc->crcount;
1073 spin_unlock_bh(&im->lock);
1075 spin_lock_bh(&in_dev->mc_tomb_lock);
1076 pmc->next = in_dev->mc_tomb;
1077 in_dev->mc_tomb = pmc;
1078 spin_unlock_bh(&in_dev->mc_tomb_lock);
1081 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1083 struct ip_mc_list *pmc, *pmc_prev;
1084 struct ip_sf_list *psf, *psf_next;
1086 spin_lock_bh(&in_dev->mc_tomb_lock);
1088 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1089 if (pmc->multiaddr == multiaddr)
1095 pmc_prev->next = pmc->next;
1097 in_dev->mc_tomb = pmc->next;
1099 spin_unlock_bh(&in_dev->mc_tomb_lock);
1101 for (psf=pmc->tomb; psf; psf=psf_next) {
1102 psf_next = psf->sf_next;
1105 in_dev_put(pmc->interface);
1110 static void igmpv3_clear_delrec(struct in_device *in_dev)
1112 struct ip_mc_list *pmc, *nextpmc;
1114 spin_lock_bh(&in_dev->mc_tomb_lock);
1115 pmc = in_dev->mc_tomb;
1116 in_dev->mc_tomb = NULL;
1117 spin_unlock_bh(&in_dev->mc_tomb_lock);
1119 for (; pmc; pmc = nextpmc) {
1120 nextpmc = pmc->next;
1121 ip_mc_clear_src(pmc);
1122 in_dev_put(pmc->interface);
1125 /* clear dead sources, too */
1127 for_each_pmc_rcu(in_dev, pmc) {
1128 struct ip_sf_list *psf, *psf_next;
1130 spin_lock_bh(&pmc->lock);
1133 spin_unlock_bh(&pmc->lock);
1134 for (; psf; psf=psf_next) {
1135 psf_next = psf->sf_next;
1143 static void igmp_group_dropped(struct ip_mc_list *im)
1145 struct in_device *in_dev = im->interface;
1146 #ifdef CONFIG_IP_MULTICAST
1152 ip_mc_filter_del(in_dev, im->multiaddr);
1155 #ifdef CONFIG_IP_MULTICAST
1156 if (im->multiaddr == IGMP_ALL_HOSTS)
1159 reporter = im->reporter;
1160 igmp_stop_timer(im);
1162 if (!in_dev->dead) {
1163 if (IGMP_V1_SEEN(in_dev))
1165 if (IGMP_V2_SEEN(in_dev)) {
1167 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1171 igmpv3_add_delrec(in_dev, im);
1173 igmp_ifc_event(in_dev);
1178 static void igmp_group_added(struct ip_mc_list *im)
1180 struct in_device *in_dev = im->interface;
1182 if (im->loaded == 0) {
1184 ip_mc_filter_add(in_dev, im->multiaddr);
1187 #ifdef CONFIG_IP_MULTICAST
1188 if (im->multiaddr == IGMP_ALL_HOSTS)
1193 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1194 spin_lock_bh(&im->lock);
1195 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1196 spin_unlock_bh(&im->lock);
1201 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1202 IGMP_Unsolicited_Report_Count;
1203 igmp_ifc_event(in_dev);
1209 * Multicast list managers
1214 * A socket has joined a multicast group on device dev.
1217 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1219 struct ip_mc_list *im;
1223 for_each_pmc_rtnl(in_dev, im) {
1224 if (im->multiaddr == addr) {
1226 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1231 im = kzalloc(sizeof(*im), GFP_KERNEL);
1236 im->interface = in_dev;
1237 in_dev_hold(in_dev);
1238 im->multiaddr = addr;
1239 /* initial mode is (EX, empty) */
1240 im->sfmode = MCAST_EXCLUDE;
1241 im->sfcount[MCAST_EXCLUDE] = 1;
1242 atomic_set(&im->refcnt, 1);
1243 spin_lock_init(&im->lock);
1244 #ifdef CONFIG_IP_MULTICAST
1245 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1246 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1249 im->next_rcu = in_dev->mc_list;
1251 rcu_assign_pointer(in_dev->mc_list, im);
1253 #ifdef CONFIG_IP_MULTICAST
1254 igmpv3_del_delrec(in_dev, im->multiaddr);
1256 igmp_group_added(im);
1258 ip_rt_multicast_event(in_dev);
1262 EXPORT_SYMBOL(ip_mc_inc_group);
1265 * Resend IGMP JOIN report; used for bonding.
1266 * Called with rcu_read_lock()
1268 void ip_mc_rejoin_groups(struct in_device *in_dev)
1270 #ifdef CONFIG_IP_MULTICAST
1271 struct ip_mc_list *im;
1274 for_each_pmc_rcu(in_dev, im) {
1275 if (im->multiaddr == IGMP_ALL_HOSTS)
1278 /* a failover is happening and switches
1279 * must be notified immediately
1281 if (IGMP_V1_SEEN(in_dev))
1282 type = IGMP_HOST_MEMBERSHIP_REPORT;
1283 else if (IGMP_V2_SEEN(in_dev))
1284 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1286 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1287 igmp_send_report(in_dev, im, type);
1291 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1294 * A socket has left a multicast group on device dev
1297 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1299 struct ip_mc_list *i;
1300 struct ip_mc_list __rcu **ip;
1304 for (ip = &in_dev->mc_list;
1305 (i = rtnl_dereference(*ip)) != NULL;
1306 ip = &i->next_rcu) {
1307 if (i->multiaddr == addr) {
1308 if (--i->users == 0) {
1311 igmp_group_dropped(i);
1315 ip_rt_multicast_event(in_dev);
1324 EXPORT_SYMBOL(ip_mc_dec_group);
1326 /* Device changing type */
1328 void ip_mc_unmap(struct in_device *in_dev)
1330 struct ip_mc_list *pmc;
1334 for_each_pmc_rtnl(in_dev, pmc)
1335 igmp_group_dropped(pmc);
1338 void ip_mc_remap(struct in_device *in_dev)
1340 struct ip_mc_list *pmc;
1344 for_each_pmc_rtnl(in_dev, pmc)
1345 igmp_group_added(pmc);
1348 /* Device going down */
1350 void ip_mc_down(struct in_device *in_dev)
1352 struct ip_mc_list *pmc;
1356 for_each_pmc_rtnl(in_dev, pmc)
1357 igmp_group_dropped(pmc);
1359 #ifdef CONFIG_IP_MULTICAST
1360 in_dev->mr_ifc_count = 0;
1361 if (del_timer(&in_dev->mr_ifc_timer))
1362 __in_dev_put(in_dev);
1363 in_dev->mr_gq_running = 0;
1364 if (del_timer(&in_dev->mr_gq_timer))
1365 __in_dev_put(in_dev);
1366 igmpv3_clear_delrec(in_dev);
1369 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1372 void ip_mc_init_dev(struct in_device *in_dev)
1376 in_dev->mc_tomb = NULL;
1377 #ifdef CONFIG_IP_MULTICAST
1378 in_dev->mr_gq_running = 0;
1379 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1380 (unsigned long)in_dev);
1381 in_dev->mr_ifc_count = 0;
1382 in_dev->mc_count = 0;
1383 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1384 (unsigned long)in_dev);
1385 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1388 spin_lock_init(&in_dev->mc_tomb_lock);
1391 /* Device going up */
1393 void ip_mc_up(struct in_device *in_dev)
1395 struct ip_mc_list *pmc;
1399 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1401 for_each_pmc_rtnl(in_dev, pmc)
1402 igmp_group_added(pmc);
1406 * Device is about to be destroyed: clean up.
1409 void ip_mc_destroy_dev(struct in_device *in_dev)
1411 struct ip_mc_list *i;
1415 /* Deactivate timers */
1418 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1419 in_dev->mc_list = i->next_rcu;
1422 /* We've dropped the groups in ip_mc_down already */
1428 /* RTNL is locked */
1429 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1431 struct net_device *dev = NULL;
1432 struct in_device *idev = NULL;
1434 if (imr->imr_ifindex) {
1435 idev = inetdev_by_index(net, imr->imr_ifindex);
1438 if (imr->imr_address.s_addr) {
1439 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1445 struct rtable *rt = ip_route_output(net,
1446 imr->imr_multiaddr.s_addr,
1454 imr->imr_ifindex = dev->ifindex;
1455 idev = __in_dev_get_rtnl(dev);
1461 * Join a socket to a group
1463 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1464 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1467 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1470 struct ip_sf_list *psf, *psf_prev;
1474 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1475 if (psf->sf_inaddr == *psfsrc)
1479 if (!psf || psf->sf_count[sfmode] == 0) {
1480 /* source filter not found, or count wrong => bug */
1483 psf->sf_count[sfmode]--;
1484 if (psf->sf_count[sfmode] == 0) {
1485 ip_rt_multicast_event(pmc->interface);
1487 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1488 #ifdef CONFIG_IP_MULTICAST
1489 struct in_device *in_dev = pmc->interface;
1492 /* no more filters for this source */
1494 psf_prev->sf_next = psf->sf_next;
1496 pmc->sources = psf->sf_next;
1497 #ifdef CONFIG_IP_MULTICAST
1498 if (psf->sf_oldin &&
1499 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1500 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1501 IGMP_Unsolicited_Report_Count;
1502 psf->sf_next = pmc->tomb;
1512 #ifndef CONFIG_IP_MULTICAST
1513 #define igmp_ifc_event(x) do { } while (0)
1516 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1517 int sfcount, __be32 *psfsrc, int delta)
1519 struct ip_mc_list *pmc;
1526 for_each_pmc_rcu(in_dev, pmc) {
1527 if (*pmca == pmc->multiaddr)
1531 /* MCA not found?? bug */
1535 spin_lock_bh(&pmc->lock);
1537 #ifdef CONFIG_IP_MULTICAST
1542 if (!pmc->sfcount[sfmode])
1544 pmc->sfcount[sfmode]--;
1547 for (i=0; i<sfcount; i++) {
1548 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1550 changerec |= rv > 0;
1554 if (pmc->sfmode == MCAST_EXCLUDE &&
1555 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1556 pmc->sfcount[MCAST_INCLUDE]) {
1557 #ifdef CONFIG_IP_MULTICAST
1558 struct ip_sf_list *psf;
1561 /* filter mode change */
1562 pmc->sfmode = MCAST_INCLUDE;
1563 #ifdef CONFIG_IP_MULTICAST
1564 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1565 IGMP_Unsolicited_Report_Count;
1566 in_dev->mr_ifc_count = pmc->crcount;
1567 for (psf=pmc->sources; psf; psf = psf->sf_next)
1568 psf->sf_crcount = 0;
1569 igmp_ifc_event(pmc->interface);
1570 } else if (sf_setstate(pmc) || changerec) {
1571 igmp_ifc_event(pmc->interface);
1575 spin_unlock_bh(&pmc->lock);
1580 * Add multicast single-source filter to the interface list
1582 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1585 struct ip_sf_list *psf, *psf_prev;
1588 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589 if (psf->sf_inaddr == *psfsrc)
1594 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1597 psf->sf_inaddr = *psfsrc;
1599 psf_prev->sf_next = psf;
1603 psf->sf_count[sfmode]++;
1604 if (psf->sf_count[sfmode] == 1) {
1605 ip_rt_multicast_event(pmc->interface);
1610 #ifdef CONFIG_IP_MULTICAST
1611 static void sf_markstate(struct ip_mc_list *pmc)
1613 struct ip_sf_list *psf;
1614 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1616 for (psf=pmc->sources; psf; psf=psf->sf_next)
1617 if (pmc->sfcount[MCAST_EXCLUDE]) {
1618 psf->sf_oldin = mca_xcount ==
1619 psf->sf_count[MCAST_EXCLUDE] &&
1620 !psf->sf_count[MCAST_INCLUDE];
1622 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1625 static int sf_setstate(struct ip_mc_list *pmc)
1627 struct ip_sf_list *psf, *dpsf;
1628 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1629 int qrv = pmc->interface->mr_qrv;
1633 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1634 if (pmc->sfcount[MCAST_EXCLUDE]) {
1635 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1636 !psf->sf_count[MCAST_INCLUDE];
1638 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1640 if (!psf->sf_oldin) {
1641 struct ip_sf_list *prev = NULL;
1643 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1644 if (dpsf->sf_inaddr == psf->sf_inaddr)
1650 prev->sf_next = dpsf->sf_next;
1652 pmc->tomb = dpsf->sf_next;
1655 psf->sf_crcount = qrv;
1658 } else if (psf->sf_oldin) {
1660 psf->sf_crcount = 0;
1662 * add or update "delete" records if an active filter
1665 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1666 if (dpsf->sf_inaddr == psf->sf_inaddr)
1669 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1673 /* pmc->lock held by callers */
1674 dpsf->sf_next = pmc->tomb;
1677 dpsf->sf_crcount = qrv;
1686 * Add multicast source filter list to the interface list
1688 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1689 int sfcount, __be32 *psfsrc, int delta)
1691 struct ip_mc_list *pmc;
1698 for_each_pmc_rcu(in_dev, pmc) {
1699 if (*pmca == pmc->multiaddr)
1703 /* MCA not found?? bug */
1707 spin_lock_bh(&pmc->lock);
1710 #ifdef CONFIG_IP_MULTICAST
1713 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1715 pmc->sfcount[sfmode]++;
1717 for (i=0; i<sfcount; i++) {
1718 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1726 pmc->sfcount[sfmode]--;
1728 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1729 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1730 #ifdef CONFIG_IP_MULTICAST
1731 struct ip_sf_list *psf;
1732 in_dev = pmc->interface;
1735 /* filter mode change */
1736 if (pmc->sfcount[MCAST_EXCLUDE])
1737 pmc->sfmode = MCAST_EXCLUDE;
1738 else if (pmc->sfcount[MCAST_INCLUDE])
1739 pmc->sfmode = MCAST_INCLUDE;
1740 #ifdef CONFIG_IP_MULTICAST
1741 /* else no filters; keep old mode for reports */
1743 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1744 IGMP_Unsolicited_Report_Count;
1745 in_dev->mr_ifc_count = pmc->crcount;
1746 for (psf=pmc->sources; psf; psf = psf->sf_next)
1747 psf->sf_crcount = 0;
1748 igmp_ifc_event(in_dev);
1749 } else if (sf_setstate(pmc)) {
1750 igmp_ifc_event(in_dev);
1753 spin_unlock_bh(&pmc->lock);
1757 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1759 struct ip_sf_list *psf, *nextpsf;
1761 for (psf=pmc->tomb; psf; psf=nextpsf) {
1762 nextpsf = psf->sf_next;
1766 for (psf=pmc->sources; psf; psf=nextpsf) {
1767 nextpsf = psf->sf_next;
1770 pmc->sources = NULL;
1771 pmc->sfmode = MCAST_EXCLUDE;
1772 pmc->sfcount[MCAST_INCLUDE] = 0;
1773 pmc->sfcount[MCAST_EXCLUDE] = 1;
1778 * Join a multicast group
1780 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1783 __be32 addr = imr->imr_multiaddr.s_addr;
1784 struct ip_mc_socklist *iml = NULL, *i;
1785 struct in_device *in_dev;
1786 struct inet_sock *inet = inet_sk(sk);
1787 struct net *net = sock_net(sk);
1791 if (!ipv4_is_multicast(addr))
1796 in_dev = ip_mc_find_dev(net, imr);
1805 ifindex = imr->imr_ifindex;
1806 for_each_pmc_rtnl(inet, i) {
1807 if (i->multi.imr_multiaddr.s_addr == addr &&
1808 i->multi.imr_ifindex == ifindex)
1813 if (count >= sysctl_igmp_max_memberships)
1815 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1819 memcpy(&iml->multi, imr, sizeof(*imr));
1820 iml->next_rcu = inet->mc_list;
1822 iml->sfmode = MCAST_EXCLUDE;
1823 rcu_assign_pointer(inet->mc_list, iml);
1824 ip_mc_inc_group(in_dev, addr);
1830 EXPORT_SYMBOL(ip_mc_join_group);
1832 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1833 struct in_device *in_dev)
1835 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1839 /* any-source empty exclude case */
1840 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1841 iml->sfmode, 0, NULL, 0);
1843 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1844 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1845 RCU_INIT_POINTER(iml->sflist, NULL);
1846 /* decrease mem now to avoid the memleak warning */
1847 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1848 kfree_rcu(psf, rcu);
1853 * Ask a socket to leave a group.
1856 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1858 struct inet_sock *inet = inet_sk(sk);
1859 struct ip_mc_socklist *iml;
1860 struct ip_mc_socklist __rcu **imlp;
1861 struct in_device *in_dev;
1862 struct net *net = sock_net(sk);
1863 __be32 group = imr->imr_multiaddr.s_addr;
1865 int ret = -EADDRNOTAVAIL;
1868 in_dev = ip_mc_find_dev(net, imr);
1869 ifindex = imr->imr_ifindex;
1870 for (imlp = &inet->mc_list;
1871 (iml = rtnl_dereference(*imlp)) != NULL;
1872 imlp = &iml->next_rcu) {
1873 if (iml->multi.imr_multiaddr.s_addr != group)
1876 if (iml->multi.imr_ifindex != ifindex)
1878 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1879 iml->multi.imr_address.s_addr)
1882 (void) ip_mc_leave_src(sk, iml, in_dev);
1884 *imlp = iml->next_rcu;
1887 ip_mc_dec_group(in_dev, group);
1889 /* decrease mem now to avoid the memleak warning */
1890 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1891 kfree_rcu(iml, rcu);
1900 int ip_mc_source(int add, int omode, struct sock *sk, struct
1901 ip_mreq_source *mreqs, int ifindex)
1904 struct ip_mreqn imr;
1905 __be32 addr = mreqs->imr_multiaddr;
1906 struct ip_mc_socklist *pmc;
1907 struct in_device *in_dev = NULL;
1908 struct inet_sock *inet = inet_sk(sk);
1909 struct ip_sf_socklist *psl;
1910 struct net *net = sock_net(sk);
1914 if (!ipv4_is_multicast(addr))
1919 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1920 imr.imr_address.s_addr = mreqs->imr_interface;
1921 imr.imr_ifindex = ifindex;
1922 in_dev = ip_mc_find_dev(net, &imr);
1928 err = -EADDRNOTAVAIL;
1930 for_each_pmc_rtnl(inet, pmc) {
1931 if ((pmc->multi.imr_multiaddr.s_addr ==
1932 imr.imr_multiaddr.s_addr) &&
1933 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1936 if (!pmc) { /* must have a prior join */
1940 /* if a source filter was set, must be the same mode as before */
1942 if (pmc->sfmode != omode) {
1946 } else if (pmc->sfmode != omode) {
1947 /* allow mode switches for empty-set filters */
1948 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1949 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1951 pmc->sfmode = omode;
1954 psl = rtnl_dereference(pmc->sflist);
1957 goto done; /* err = -EADDRNOTAVAIL */
1959 for (i=0; i<psl->sl_count; i++) {
1960 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1965 if (rv) /* source not found */
1966 goto done; /* err = -EADDRNOTAVAIL */
1968 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1969 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1974 /* update the interface filter */
1975 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1976 &mreqs->imr_sourceaddr, 1);
1978 for (j=i+1; j<psl->sl_count; j++)
1979 psl->sl_addr[j-1] = psl->sl_addr[j];
1984 /* else, add a new source to the filter */
1986 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1990 if (!psl || psl->sl_count == psl->sl_max) {
1991 struct ip_sf_socklist *newpsl;
1992 int count = IP_SFBLOCK;
1995 count += psl->sl_max;
1996 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2001 newpsl->sl_max = count;
2002 newpsl->sl_count = count - IP_SFBLOCK;
2004 for (i=0; i<psl->sl_count; i++)
2005 newpsl->sl_addr[i] = psl->sl_addr[i];
2006 /* decrease mem now to avoid the memleak warning */
2007 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2008 kfree_rcu(psl, rcu);
2010 rcu_assign_pointer(pmc->sflist, newpsl);
2013 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2014 for (i=0; i<psl->sl_count; i++) {
2015 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2020 if (rv == 0) /* address already there is an error */
2022 for (j=psl->sl_count-1; j>=i; j--)
2023 psl->sl_addr[j+1] = psl->sl_addr[j];
2024 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2027 /* update the interface list */
2028 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2029 &mreqs->imr_sourceaddr, 1);
2033 return ip_mc_leave_group(sk, &imr);
2037 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2040 struct ip_mreqn imr;
2041 __be32 addr = msf->imsf_multiaddr;
2042 struct ip_mc_socklist *pmc;
2043 struct in_device *in_dev;
2044 struct inet_sock *inet = inet_sk(sk);
2045 struct ip_sf_socklist *newpsl, *psl;
2046 struct net *net = sock_net(sk);
2049 if (!ipv4_is_multicast(addr))
2051 if (msf->imsf_fmode != MCAST_INCLUDE &&
2052 msf->imsf_fmode != MCAST_EXCLUDE)
2057 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2058 imr.imr_address.s_addr = msf->imsf_interface;
2059 imr.imr_ifindex = ifindex;
2060 in_dev = ip_mc_find_dev(net, &imr);
2067 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2068 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2073 for_each_pmc_rtnl(inet, pmc) {
2074 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2075 pmc->multi.imr_ifindex == imr.imr_ifindex)
2078 if (!pmc) { /* must have a prior join */
2082 if (msf->imsf_numsrc) {
2083 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2089 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2090 memcpy(newpsl->sl_addr, msf->imsf_slist,
2091 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2092 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2093 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2095 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2100 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2101 msf->imsf_fmode, 0, NULL, 0);
2103 psl = rtnl_dereference(pmc->sflist);
2105 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2106 psl->sl_count, psl->sl_addr, 0);
2107 /* decrease mem now to avoid the memleak warning */
2108 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2109 kfree_rcu(psl, rcu);
2111 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2113 rcu_assign_pointer(pmc->sflist, newpsl);
2114 pmc->sfmode = msf->imsf_fmode;
2119 err = ip_mc_leave_group(sk, &imr);
2123 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2124 struct ip_msfilter __user *optval, int __user *optlen)
2126 int err, len, count, copycount;
2127 struct ip_mreqn imr;
2128 __be32 addr = msf->imsf_multiaddr;
2129 struct ip_mc_socklist *pmc;
2130 struct in_device *in_dev;
2131 struct inet_sock *inet = inet_sk(sk);
2132 struct ip_sf_socklist *psl;
2133 struct net *net = sock_net(sk);
2135 if (!ipv4_is_multicast(addr))
2140 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2141 imr.imr_address.s_addr = msf->imsf_interface;
2142 imr.imr_ifindex = 0;
2143 in_dev = ip_mc_find_dev(net, &imr);
2149 err = -EADDRNOTAVAIL;
2151 for_each_pmc_rtnl(inet, pmc) {
2152 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2153 pmc->multi.imr_ifindex == imr.imr_ifindex)
2156 if (!pmc) /* must have a prior join */
2158 msf->imsf_fmode = pmc->sfmode;
2159 psl = rtnl_dereference(pmc->sflist);
2165 count = psl->sl_count;
2167 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2168 len = copycount * sizeof(psl->sl_addr[0]);
2169 msf->imsf_numsrc = count;
2170 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2171 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2175 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2183 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2184 struct group_filter __user *optval, int __user *optlen)
2186 int err, i, count, copycount;
2187 struct sockaddr_in *psin;
2189 struct ip_mc_socklist *pmc;
2190 struct inet_sock *inet = inet_sk(sk);
2191 struct ip_sf_socklist *psl;
2193 psin = (struct sockaddr_in *)&gsf->gf_group;
2194 if (psin->sin_family != AF_INET)
2196 addr = psin->sin_addr.s_addr;
2197 if (!ipv4_is_multicast(addr))
2202 err = -EADDRNOTAVAIL;
2204 for_each_pmc_rtnl(inet, pmc) {
2205 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2206 pmc->multi.imr_ifindex == gsf->gf_interface)
2209 if (!pmc) /* must have a prior join */
2211 gsf->gf_fmode = pmc->sfmode;
2212 psl = rtnl_dereference(pmc->sflist);
2214 count = psl ? psl->sl_count : 0;
2215 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2216 gsf->gf_numsrc = count;
2217 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2218 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2221 for (i=0; i<copycount; i++) {
2222 struct sockaddr_storage ss;
2224 psin = (struct sockaddr_in *)&ss;
2225 memset(&ss, 0, sizeof(ss));
2226 psin->sin_family = AF_INET;
2227 psin->sin_addr.s_addr = psl->sl_addr[i];
2228 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2240 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2242 struct inet_sock *inet = inet_sk(sk);
2243 struct ip_mc_socklist *pmc;
2244 struct ip_sf_socklist *psl;
2249 if (!ipv4_is_multicast(loc_addr))
2253 for_each_pmc_rcu(inet, pmc) {
2254 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2255 pmc->multi.imr_ifindex == dif)
2261 psl = rcu_dereference(pmc->sflist);
2262 ret = (pmc->sfmode == MCAST_EXCLUDE);
2266 for (i=0; i<psl->sl_count; i++) {
2267 if (psl->sl_addr[i] == rmt_addr)
2271 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2273 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2283 * A socket is closing.
2286 void ip_mc_drop_socket(struct sock *sk)
2288 struct inet_sock *inet = inet_sk(sk);
2289 struct ip_mc_socklist *iml;
2290 struct net *net = sock_net(sk);
2292 if (inet->mc_list == NULL)
2296 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2297 struct in_device *in_dev;
2299 inet->mc_list = iml->next_rcu;
2300 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2301 (void) ip_mc_leave_src(sk, iml, in_dev);
2303 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2304 /* decrease mem now to avoid the memleak warning */
2305 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2306 kfree_rcu(iml, rcu);
2311 /* called with rcu_read_lock() */
2312 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2314 struct ip_mc_list *im;
2315 struct ip_sf_list *psf;
2318 for_each_pmc_rcu(in_dev, im) {
2319 if (im->multiaddr == mc_addr)
2322 if (im && proto == IPPROTO_IGMP) {
2326 for (psf=im->sources; psf; psf=psf->sf_next) {
2327 if (psf->sf_inaddr == src_addr)
2331 rv = psf->sf_count[MCAST_INCLUDE] ||
2332 psf->sf_count[MCAST_EXCLUDE] !=
2333 im->sfcount[MCAST_EXCLUDE];
2335 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2337 rv = 1; /* unspecified source; tentatively allow */
2342 #if defined(CONFIG_PROC_FS)
2343 struct igmp_mc_iter_state {
2344 struct seq_net_private p;
2345 struct net_device *dev;
2346 struct in_device *in_dev;
2349 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2351 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2353 struct net *net = seq_file_net(seq);
2354 struct ip_mc_list *im = NULL;
2355 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2357 state->in_dev = NULL;
2358 for_each_netdev_rcu(net, state->dev) {
2359 struct in_device *in_dev;
2361 in_dev = __in_dev_get_rcu(state->dev);
2364 im = rcu_dereference(in_dev->mc_list);
2366 state->in_dev = in_dev;
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);
2377 im = rcu_dereference(im->next_rcu);
2379 state->dev = next_net_device_rcu(state->dev);
2381 state->in_dev = NULL;
2384 state->in_dev = __in_dev_get_rcu(state->dev);
2387 im = rcu_dereference(state->in_dev->mc_list);
2392 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2394 struct ip_mc_list *im = igmp_mc_get_first(seq);
2396 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2398 return pos ? NULL : im;
2401 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2405 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2408 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2410 struct ip_mc_list *im;
2411 if (v == SEQ_START_TOKEN)
2412 im = igmp_mc_get_first(seq);
2414 im = igmp_mc_get_next(seq, v);
2419 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2422 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2424 state->in_dev = NULL;
2429 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2431 if (v == SEQ_START_TOKEN)
2433 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2435 struct ip_mc_list *im = (struct ip_mc_list *)v;
2436 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2438 #ifdef CONFIG_IP_MULTICAST
2439 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2440 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2446 if (rcu_dereference(state->in_dev->mc_list) == im) {
2447 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2448 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2452 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2453 im->multiaddr, im->users,
2454 im->tm_running, im->tm_running ?
2455 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2461 static const struct seq_operations igmp_mc_seq_ops = {
2462 .start = igmp_mc_seq_start,
2463 .next = igmp_mc_seq_next,
2464 .stop = igmp_mc_seq_stop,
2465 .show = igmp_mc_seq_show,
2468 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2470 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2471 sizeof(struct igmp_mc_iter_state));
2474 static const struct file_operations igmp_mc_seq_fops = {
2475 .owner = THIS_MODULE,
2476 .open = igmp_mc_seq_open,
2478 .llseek = seq_lseek,
2479 .release = seq_release_net,
2482 struct igmp_mcf_iter_state {
2483 struct seq_net_private p;
2484 struct net_device *dev;
2485 struct in_device *idev;
2486 struct ip_mc_list *im;
2489 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2491 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2493 struct net *net = seq_file_net(seq);
2494 struct ip_sf_list *psf = NULL;
2495 struct ip_mc_list *im = NULL;
2496 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2500 for_each_netdev_rcu(net, state->dev) {
2501 struct in_device *idev;
2502 idev = __in_dev_get_rcu(state->dev);
2503 if (unlikely(idev == NULL))
2505 im = rcu_dereference(idev->mc_list);
2506 if (likely(im != NULL)) {
2507 spin_lock_bh(&im->lock);
2509 if (likely(psf != NULL)) {
2514 spin_unlock_bh(&im->lock);
2520 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2522 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2526 spin_unlock_bh(&state->im->lock);
2527 state->im = state->im->next;
2528 while (!state->im) {
2529 state->dev = next_net_device_rcu(state->dev);
2534 state->idev = __in_dev_get_rcu(state->dev);
2537 state->im = rcu_dereference(state->idev->mc_list);
2541 spin_lock_bh(&state->im->lock);
2542 psf = state->im->sources;
2548 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2550 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2552 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2554 return pos ? NULL : psf;
2557 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2561 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2564 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2566 struct ip_sf_list *psf;
2567 if (v == SEQ_START_TOKEN)
2568 psf = igmp_mcf_get_first(seq);
2570 psf = igmp_mcf_get_next(seq, v);
2575 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2578 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2579 if (likely(state->im != NULL)) {
2580 spin_unlock_bh(&state->im->lock);
2588 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2590 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2591 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2593 if (v == SEQ_START_TOKEN) {
2596 "%10s %10s %6s %6s\n", "Idx",
2598 "SRC", "INC", "EXC");
2602 "0x%08x %6lu %6lu\n",
2603 state->dev->ifindex, state->dev->name,
2604 ntohl(state->im->multiaddr),
2605 ntohl(psf->sf_inaddr),
2606 psf->sf_count[MCAST_INCLUDE],
2607 psf->sf_count[MCAST_EXCLUDE]);
2612 static const struct seq_operations igmp_mcf_seq_ops = {
2613 .start = igmp_mcf_seq_start,
2614 .next = igmp_mcf_seq_next,
2615 .stop = igmp_mcf_seq_stop,
2616 .show = igmp_mcf_seq_show,
2619 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2621 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2622 sizeof(struct igmp_mcf_iter_state));
2625 static const struct file_operations igmp_mcf_seq_fops = {
2626 .owner = THIS_MODULE,
2627 .open = igmp_mcf_seq_open,
2629 .llseek = seq_lseek,
2630 .release = seq_release_net,
2633 static int __net_init igmp_net_init(struct net *net)
2635 struct proc_dir_entry *pde;
2637 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2640 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2646 proc_net_remove(net, "igmp");
2651 static void __net_exit igmp_net_exit(struct net *net)
2653 proc_net_remove(net, "mcfilter");
2654 proc_net_remove(net, "igmp");
2657 static struct pernet_operations igmp_net_ops = {
2658 .init = igmp_net_init,
2659 .exit = igmp_net_exit,
2662 int __init igmp_mc_proc_init(void)
2664 return register_pernet_subsys(&igmp_net_ops);