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 <asm/system.h>
77
#include <linux/types.h>
78
#include <linux/kernel.h>
79
#include <linux/jiffies.h>
80
#include <linux/string.h>
81
#include <linux/socket.h>
82
#include <linux/sockios.h>
84
#include <linux/inet.h>
85
#include <linux/netdevice.h>
86
#include <linux/skbuff.h>
87
#include <linux/inetdevice.h>
88
#include <linux/igmp.h>
89
#include <linux/if_arp.h>
90
#include <linux/rtnetlink.h>
91
#include <linux/times.h>
93
#include <net/net_namespace.h>
96
#include <net/protocol.h>
97
#include <net/route.h>
99
#include <net/checksum.h>
100
#include <linux/netfilter_ipv4.h>
101
#ifdef CONFIG_IP_MROUTE
102
#include <linux/mroute.h>
104
#ifdef CONFIG_PROC_FS
105
#include <linux/proc_fs.h>
106
#include <linux/seq_file.h>
109
#define IP_MAX_MEMBERSHIPS 20
110
#define IP_MAX_MSF 10
112
#ifdef CONFIG_IP_MULTICAST
113
/* Parameter names and values are taken from igmp-v2-06 draft */
115
#define IGMP_V1_Router_Present_Timeout (400*HZ)
116
#define IGMP_V2_Router_Present_Timeout (400*HZ)
117
#define IGMP_Unsolicited_Report_Interval (10*HZ)
118
#define IGMP_Query_Response_Interval (10*HZ)
119
#define IGMP_Unsolicited_Report_Count 2
122
#define IGMP_Initial_Report_Delay (1)
124
/* IGMP_Initial_Report_Delay is not from IGMP specs!
125
* IGMP specs require to report membership immediately after
126
* joining a group, but we delay the first report by a
127
* small interval. It seems more natural and still does not
128
* contradict to specs provided this delay is small enough.
131
#define IGMP_V1_SEEN(in_dev) \
132
(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133
IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134
((in_dev)->mr_v1_seen && \
135
time_before(jiffies, (in_dev)->mr_v1_seen)))
136
#define IGMP_V2_SEEN(in_dev) \
137
(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138
IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139
((in_dev)->mr_v2_seen && \
140
time_before(jiffies, (in_dev)->mr_v2_seen)))
142
static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
143
static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
144
static void igmpv3_clear_delrec(struct in_device *in_dev);
145
static int sf_setstate(struct ip_mc_list *pmc);
146
static void sf_markstate(struct ip_mc_list *pmc);
148
static void ip_mc_clear_src(struct ip_mc_list *pmc);
149
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150
int sfcount, __be32 *psfsrc, int delta);
152
static void ip_ma_put(struct ip_mc_list *im)
154
if (atomic_dec_and_test(&im->refcnt)) {
155
in_dev_put(im->interface);
160
#ifdef CONFIG_IP_MULTICAST
166
static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168
spin_lock_bh(&im->lock);
169
if (del_timer(&im->timer))
170
atomic_dec(&im->refcnt);
173
im->unsolicit_count = 0;
174
spin_unlock_bh(&im->lock);
177
/* It must be called with locked im->lock */
178
static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180
int tv = net_random() % max_delay;
183
if (!mod_timer(&im->timer, jiffies+tv+2))
184
atomic_inc(&im->refcnt);
187
static void igmp_gq_start_timer(struct in_device *in_dev)
189
int tv = net_random() % in_dev->mr_maxdelay;
191
in_dev->mr_gq_running = 1;
192
if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
196
static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198
int tv = net_random() % delay;
200
if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
204
static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206
spin_lock_bh(&im->lock);
207
im->unsolicit_count = 0;
208
if (del_timer(&im->timer)) {
209
if ((long)(im->timer.expires-jiffies) < max_delay) {
210
add_timer(&im->timer);
212
spin_unlock_bh(&im->lock);
215
atomic_dec(&im->refcnt);
217
igmp_start_timer(im, max_delay);
218
spin_unlock_bh(&im->lock);
223
* Send an IGMP report.
226
#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
229
static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
230
int gdeleted, int sdeleted)
233
case IGMPV3_MODE_IS_INCLUDE:
234
case IGMPV3_MODE_IS_EXCLUDE:
235
if (gdeleted || sdeleted)
237
if (!(pmc->gsquery && !psf->sf_gsresp)) {
238
if (pmc->sfmode == MCAST_INCLUDE)
240
/* don't include if this source is excluded
243
if (psf->sf_count[MCAST_INCLUDE])
244
return type == IGMPV3_MODE_IS_INCLUDE;
245
return pmc->sfcount[MCAST_EXCLUDE] ==
246
psf->sf_count[MCAST_EXCLUDE];
249
case IGMPV3_CHANGE_TO_INCLUDE:
250
if (gdeleted || sdeleted)
252
return psf->sf_count[MCAST_INCLUDE] != 0;
253
case IGMPV3_CHANGE_TO_EXCLUDE:
254
if (gdeleted || sdeleted)
256
if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
257
psf->sf_count[MCAST_INCLUDE])
259
return pmc->sfcount[MCAST_EXCLUDE] ==
260
psf->sf_count[MCAST_EXCLUDE];
261
case IGMPV3_ALLOW_NEW_SOURCES:
262
if (gdeleted || !psf->sf_crcount)
264
return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
265
case IGMPV3_BLOCK_OLD_SOURCES:
266
if (pmc->sfmode == MCAST_INCLUDE)
267
return gdeleted || (psf->sf_crcount && sdeleted);
268
return psf->sf_crcount && !gdeleted && !sdeleted;
274
igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276
struct ip_sf_list *psf;
279
for (psf=pmc->sources; psf; psf=psf->sf_next) {
280
if (!is_in(pmc, psf, type, gdeleted, sdeleted))
287
static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
292
struct igmpv3_report *pig;
293
struct net *net = dev_net(dev);
295
skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
300
struct flowi fl = { .oif = dev->ifindex,
302
.daddr = IGMPV3_ALL_MCR } },
303
.proto = IPPROTO_IGMP };
304
if (ip_route_output_key(net, &rt, &fl)) {
309
if (rt->rt_src == 0) {
315
skb_dst_set(skb, &rt->u.dst);
318
skb_reserve(skb, LL_RESERVED_SPACE(dev));
320
skb_reset_network_header(skb);
322
skb_put(skb, sizeof(struct iphdr) + 4);
325
pip->ihl = (sizeof(struct iphdr)+4)>>2;
327
pip->frag_off = htons(IP_DF);
329
pip->daddr = rt->rt_dst;
330
pip->saddr = rt->rt_src;
331
pip->protocol = IPPROTO_IGMP;
332
pip->tot_len = 0; /* filled in later */
333
ip_select_ident(pip, &rt->u.dst, NULL);
334
((u8*)&pip[1])[0] = IPOPT_RA;
335
((u8*)&pip[1])[1] = 4;
336
((u8*)&pip[1])[2] = 0;
337
((u8*)&pip[1])[3] = 0;
339
skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
340
skb_put(skb, sizeof(*pig));
341
pig = igmpv3_report_hdr(skb);
342
pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
350
static int igmpv3_sendpack(struct sk_buff *skb)
352
struct igmphdr *pig = igmp_hdr(skb);
353
const int igmplen = skb->tail - skb->transport_header;
355
pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
357
return ip_local_out(skb);
360
static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
362
return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
365
static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
366
int type, struct igmpv3_grec **ppgr)
368
struct net_device *dev = pmc->interface->dev;
369
struct igmpv3_report *pih;
370
struct igmpv3_grec *pgr;
373
skb = igmpv3_newpack(dev, dev->mtu);
376
pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
377
pgr->grec_type = type;
378
pgr->grec_auxwords = 0;
380
pgr->grec_mca = pmc->multiaddr;
381
pih = igmpv3_report_hdr(skb);
382
pih->ngrec = htons(ntohs(pih->ngrec)+1);
387
#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
388
skb_tailroom(skb)) : 0)
390
static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
391
int type, int gdeleted, int sdeleted)
393
struct net_device *dev = pmc->interface->dev;
394
struct igmpv3_report *pih;
395
struct igmpv3_grec *pgr = NULL;
396
struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
397
int scount, stotal, first, isquery, truncate;
399
if (pmc->multiaddr == IGMP_ALL_HOSTS)
402
isquery = type == IGMPV3_MODE_IS_INCLUDE ||
403
type == IGMPV3_MODE_IS_EXCLUDE;
404
truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
405
type == IGMPV3_CHANGE_TO_EXCLUDE;
409
psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
414
pih = skb ? igmpv3_report_hdr(skb) : NULL;
416
/* EX and TO_EX get a fresh packet, if needed */
418
if (pih && pih->ngrec &&
419
AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
421
igmpv3_sendpack(skb);
422
skb = igmpv3_newpack(dev, dev->mtu);
427
for (psf=*psf_list; psf; psf=psf_next) {
430
psf_next = psf->sf_next;
432
if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
437
/* clear marks on query responses */
441
if (AVAILABLE(skb) < sizeof(__be32) +
442
first*sizeof(struct igmpv3_grec)) {
443
if (truncate && !first)
444
break; /* truncate these */
446
pgr->grec_nsrcs = htons(scount);
448
igmpv3_sendpack(skb);
449
skb = igmpv3_newpack(dev, dev->mtu);
454
skb = add_grhead(skb, pmc, type, &pgr);
459
psrc = (__be32 *)skb_put(skb, sizeof(__be32));
460
*psrc = psf->sf_inaddr;
462
if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
463
type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
465
if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
467
psf_prev->sf_next = psf->sf_next;
469
*psf_list = psf->sf_next;
479
if (type == IGMPV3_ALLOW_NEW_SOURCES ||
480
type == IGMPV3_BLOCK_OLD_SOURCES)
482
if (pmc->crcount || isquery) {
483
/* make sure we have room for group header */
484
if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
485
igmpv3_sendpack(skb);
486
skb = NULL; /* add_grhead will get a new one */
488
skb = add_grhead(skb, pmc, type, &pgr);
492
pgr->grec_nsrcs = htons(scount);
495
pmc->gsquery = 0; /* clear query state on report */
499
static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
501
struct sk_buff *skb = NULL;
505
read_lock(&in_dev->mc_list_lock);
506
for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
507
if (pmc->multiaddr == IGMP_ALL_HOSTS)
509
spin_lock_bh(&pmc->lock);
510
if (pmc->sfcount[MCAST_EXCLUDE])
511
type = IGMPV3_MODE_IS_EXCLUDE;
513
type = IGMPV3_MODE_IS_INCLUDE;
514
skb = add_grec(skb, pmc, type, 0, 0);
515
spin_unlock_bh(&pmc->lock);
517
read_unlock(&in_dev->mc_list_lock);
519
spin_lock_bh(&pmc->lock);
520
if (pmc->sfcount[MCAST_EXCLUDE])
521
type = IGMPV3_MODE_IS_EXCLUDE;
523
type = IGMPV3_MODE_IS_INCLUDE;
524
skb = add_grec(skb, pmc, type, 0, 0);
525
spin_unlock_bh(&pmc->lock);
529
return igmpv3_sendpack(skb);
533
* remove zero-count source records from a source filter list
535
static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
537
struct ip_sf_list *psf_prev, *psf_next, *psf;
540
for (psf=*ppsf; psf; psf = psf_next) {
541
psf_next = psf->sf_next;
542
if (psf->sf_crcount == 0) {
544
psf_prev->sf_next = psf->sf_next;
546
*ppsf = psf->sf_next;
553
static void igmpv3_send_cr(struct in_device *in_dev)
555
struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
556
struct sk_buff *skb = NULL;
559
read_lock(&in_dev->mc_list_lock);
560
spin_lock_bh(&in_dev->mc_tomb_lock);
564
for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
565
pmc_next = pmc->next;
566
if (pmc->sfmode == MCAST_INCLUDE) {
567
type = IGMPV3_BLOCK_OLD_SOURCES;
568
dtype = IGMPV3_BLOCK_OLD_SOURCES;
569
skb = add_grec(skb, pmc, type, 1, 0);
570
skb = add_grec(skb, pmc, dtype, 1, 1);
573
if (pmc->sfmode == MCAST_EXCLUDE) {
574
type = IGMPV3_CHANGE_TO_INCLUDE;
575
skb = add_grec(skb, pmc, type, 1, 0);
578
if (pmc->crcount == 0) {
579
igmpv3_clear_zeros(&pmc->tomb);
580
igmpv3_clear_zeros(&pmc->sources);
583
if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
585
pmc_prev->next = pmc_next;
587
in_dev->mc_tomb = pmc_next;
588
in_dev_put(pmc->interface);
593
spin_unlock_bh(&in_dev->mc_tomb_lock);
596
for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
597
spin_lock_bh(&pmc->lock);
598
if (pmc->sfcount[MCAST_EXCLUDE]) {
599
type = IGMPV3_BLOCK_OLD_SOURCES;
600
dtype = IGMPV3_ALLOW_NEW_SOURCES;
602
type = IGMPV3_ALLOW_NEW_SOURCES;
603
dtype = IGMPV3_BLOCK_OLD_SOURCES;
605
skb = add_grec(skb, pmc, type, 0, 0);
606
skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
608
/* filter mode changes */
610
if (pmc->sfmode == MCAST_EXCLUDE)
611
type = IGMPV3_CHANGE_TO_EXCLUDE;
613
type = IGMPV3_CHANGE_TO_INCLUDE;
614
skb = add_grec(skb, pmc, type, 0, 0);
617
spin_unlock_bh(&pmc->lock);
619
read_unlock(&in_dev->mc_list_lock);
623
(void) igmpv3_sendpack(skb);
626
static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
633
struct net_device *dev = in_dev->dev;
634
struct net *net = dev_net(dev);
635
__be32 group = pmc ? pmc->multiaddr : 0;
638
if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
639
return igmpv3_send_report(in_dev, pmc);
640
else if (type == IGMP_HOST_LEAVE_MESSAGE)
641
dst = IGMP_ALL_ROUTER;
646
struct flowi fl = { .oif = dev->ifindex,
647
.nl_u = { .ip4_u = { .daddr = dst } },
648
.proto = IPPROTO_IGMP };
649
if (ip_route_output_key(net, &rt, &fl))
652
if (rt->rt_src == 0) {
657
skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC);
663
skb_dst_set(skb, &rt->u.dst);
665
skb_reserve(skb, LL_RESERVED_SPACE(dev));
667
skb_reset_network_header(skb);
669
skb_put(skb, sizeof(struct iphdr) + 4);
672
iph->ihl = (sizeof(struct iphdr)+4)>>2;
674
iph->frag_off = htons(IP_DF);
677
iph->saddr = rt->rt_src;
678
iph->protocol = IPPROTO_IGMP;
679
ip_select_ident(iph, &rt->u.dst, NULL);
680
((u8*)&iph[1])[0] = IPOPT_RA;
681
((u8*)&iph[1])[1] = 4;
682
((u8*)&iph[1])[2] = 0;
683
((u8*)&iph[1])[3] = 0;
685
ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
690
ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
692
return ip_local_out(skb);
695
static void igmp_gq_timer_expire(unsigned long data)
697
struct in_device *in_dev = (struct in_device *)data;
699
in_dev->mr_gq_running = 0;
700
igmpv3_send_report(in_dev, NULL);
701
__in_dev_put(in_dev);
704
static void igmp_ifc_timer_expire(unsigned long data)
706
struct in_device *in_dev = (struct in_device *)data;
708
igmpv3_send_cr(in_dev);
709
if (in_dev->mr_ifc_count) {
710
in_dev->mr_ifc_count--;
711
igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
713
__in_dev_put(in_dev);
716
static void igmp_ifc_event(struct in_device *in_dev)
718
if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
720
in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
721
IGMP_Unsolicited_Report_Count;
722
igmp_ifc_start_timer(in_dev, 1);
726
static void igmp_timer_expire(unsigned long data)
728
struct ip_mc_list *im=(struct ip_mc_list *)data;
729
struct in_device *in_dev = im->interface;
731
spin_lock(&im->lock);
734
if (im->unsolicit_count) {
735
im->unsolicit_count--;
736
igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
739
spin_unlock(&im->lock);
741
if (IGMP_V1_SEEN(in_dev))
742
igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
743
else if (IGMP_V2_SEEN(in_dev))
744
igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
746
igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
751
/* mark EXCLUDE-mode sources */
752
static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
754
struct ip_sf_list *psf;
758
for (psf=pmc->sources; psf; psf=psf->sf_next) {
761
for (i=0; i<nsrcs; i++) {
762
/* skip inactive filters */
763
if (pmc->sfcount[MCAST_INCLUDE] ||
764
pmc->sfcount[MCAST_EXCLUDE] !=
765
psf->sf_count[MCAST_EXCLUDE])
767
if (srcs[i] == psf->sf_inaddr) {
774
if (scount == nsrcs) /* all sources excluded */
779
static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
781
struct ip_sf_list *psf;
784
if (pmc->sfmode == MCAST_EXCLUDE)
785
return igmp_xmarksources(pmc, nsrcs, srcs);
787
/* mark INCLUDE-mode sources */
789
for (psf=pmc->sources; psf; psf=psf->sf_next) {
792
for (i=0; i<nsrcs; i++)
793
if (srcs[i] == psf->sf_inaddr) {
807
static void igmp_heard_report(struct in_device *in_dev, __be32 group)
809
struct ip_mc_list *im;
811
/* Timers are only set for non-local groups */
813
if (group == IGMP_ALL_HOSTS)
816
read_lock(&in_dev->mc_list_lock);
817
for (im=in_dev->mc_list; im!=NULL; im=im->next) {
818
if (im->multiaddr == group) {
823
read_unlock(&in_dev->mc_list_lock);
826
static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
829
struct igmphdr *ih = igmp_hdr(skb);
830
struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
831
struct ip_mc_list *im;
832
__be32 group = ih->group;
839
/* Alas, old v1 router presents here. */
841
max_delay = IGMP_Query_Response_Interval;
842
in_dev->mr_v1_seen = jiffies +
843
IGMP_V1_Router_Present_Timeout;
846
/* v2 router present */
847
max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
848
in_dev->mr_v2_seen = jiffies +
849
IGMP_V2_Router_Present_Timeout;
851
/* cancel the interface change timer */
852
in_dev->mr_ifc_count = 0;
853
if (del_timer(&in_dev->mr_ifc_timer))
854
__in_dev_put(in_dev);
855
/* clear deleted report items */
856
igmpv3_clear_delrec(in_dev);
857
} else if (len < 12) {
858
return; /* ignore bogus packet; freed by caller */
860
if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
863
ih3 = igmpv3_query_hdr(skb);
865
if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
866
+ ntohs(ih3->nsrcs)*sizeof(__be32)))
868
ih3 = igmpv3_query_hdr(skb);
871
max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
873
max_delay = 1; /* can't mod w/ 0 */
874
in_dev->mr_maxdelay = max_delay;
876
in_dev->mr_qrv = ih3->qrv;
877
if (!group) { /* general query */
879
return; /* no sources allowed */
880
igmp_gq_start_timer(in_dev);
883
/* mark sources to include, if group & source-specific */
884
mark = ih3->nsrcs != 0;
888
* - Start the timers in all of our membership records
889
* that the query applies to for the interface on
890
* which the query arrived excl. those that belong
891
* to a "local" group (224.0.0.X)
892
* - For timers already running check if they need to
894
* - Use the igmp->igmp_code field as the maximum
897
read_lock(&in_dev->mc_list_lock);
898
for (im=in_dev->mc_list; im!=NULL; im=im->next) {
901
if (group && group != im->multiaddr)
903
if (im->multiaddr == IGMP_ALL_HOSTS)
905
spin_lock_bh(&im->lock);
907
im->gsquery = im->gsquery && mark;
910
changed = !im->gsquery ||
911
igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
912
spin_unlock_bh(&im->lock);
914
igmp_mod_timer(im, max_delay);
916
read_unlock(&in_dev->mc_list_lock);
919
int igmp_rcv(struct sk_buff *skb)
921
/* This basically follows the spec line by line -- see RFC1112 */
923
struct in_device *in_dev = in_dev_get(skb->dev);
929
if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
932
switch (skb->ip_summed) {
933
case CHECKSUM_COMPLETE:
934
if (!csum_fold(skb->csum))
939
if (__skb_checksum_complete(skb))
945
case IGMP_HOST_MEMBERSHIP_QUERY:
946
igmp_heard_query(in_dev, skb, len);
948
case IGMP_HOST_MEMBERSHIP_REPORT:
949
case IGMPV2_HOST_MEMBERSHIP_REPORT:
950
/* Is it our report looped back? */
951
if (skb_rtable(skb)->fl.iif == 0)
953
/* don't rely on MC router hearing unicast reports */
954
if (skb->pkt_type == PACKET_MULTICAST ||
955
skb->pkt_type == PACKET_BROADCAST)
956
igmp_heard_report(in_dev, ih->group);
959
#ifdef CONFIG_IP_PIMSM_V1
961
return pim_rcv_v1(skb);
963
case IGMPV3_HOST_MEMBERSHIP_REPORT:
966
case IGMP_HOST_LEAVE_MESSAGE:
968
case IGMP_MTRACE_RESP:
985
* Add a filter to a device
988
static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
990
char buf[MAX_ADDR_LEN];
991
struct net_device *dev = in_dev->dev;
993
/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
994
We will get multicast token leakage, when IFF_MULTICAST
995
is changed. This check should be done in dev->set_multicast_list
996
routine. Something sort of:
997
if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1000
if (arp_mc_map(addr, buf, dev, 0) == 0)
1001
dev_mc_add(dev, buf);
1005
* Remove a filter from a device
1008
static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1010
char buf[MAX_ADDR_LEN];
1011
struct net_device *dev = in_dev->dev;
1013
if (arp_mc_map(addr, buf, dev, 0) == 0)
1014
dev_mc_del(dev, buf);
1017
#ifdef CONFIG_IP_MULTICAST
1019
* deleted ip_mc_list manipulation
1021
static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1023
struct ip_mc_list *pmc;
1025
/* this is an "ip_mc_list" for convenience; only the fields below
1026
* are actually used. In particular, the refcnt and users are not
1027
* used for management of the delete list. Using the same structure
1028
* for deleted items allows change reports to use common code with
1029
* non-deleted or query-response MCA's.
1031
pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1034
spin_lock_bh(&im->lock);
1035
pmc->interface = im->interface;
1036
in_dev_hold(in_dev);
1037
pmc->multiaddr = im->multiaddr;
1038
pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039
IGMP_Unsolicited_Report_Count;
1040
pmc->sfmode = im->sfmode;
1041
if (pmc->sfmode == MCAST_INCLUDE) {
1042
struct ip_sf_list *psf;
1044
pmc->tomb = im->tomb;
1045
pmc->sources = im->sources;
1046
im->tomb = im->sources = NULL;
1047
for (psf=pmc->sources; psf; psf=psf->sf_next)
1048
psf->sf_crcount = pmc->crcount;
1050
spin_unlock_bh(&im->lock);
1052
spin_lock_bh(&in_dev->mc_tomb_lock);
1053
pmc->next = in_dev->mc_tomb;
1054
in_dev->mc_tomb = pmc;
1055
spin_unlock_bh(&in_dev->mc_tomb_lock);
1058
static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1060
struct ip_mc_list *pmc, *pmc_prev;
1061
struct ip_sf_list *psf, *psf_next;
1063
spin_lock_bh(&in_dev->mc_tomb_lock);
1065
for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066
if (pmc->multiaddr == multiaddr)
1072
pmc_prev->next = pmc->next;
1074
in_dev->mc_tomb = pmc->next;
1076
spin_unlock_bh(&in_dev->mc_tomb_lock);
1078
for (psf=pmc->tomb; psf; psf=psf_next) {
1079
psf_next = psf->sf_next;
1082
in_dev_put(pmc->interface);
1087
static void igmpv3_clear_delrec(struct in_device *in_dev)
1089
struct ip_mc_list *pmc, *nextpmc;
1091
spin_lock_bh(&in_dev->mc_tomb_lock);
1092
pmc = in_dev->mc_tomb;
1093
in_dev->mc_tomb = NULL;
1094
spin_unlock_bh(&in_dev->mc_tomb_lock);
1096
for (; pmc; pmc = nextpmc) {
1097
nextpmc = pmc->next;
1098
ip_mc_clear_src(pmc);
1099
in_dev_put(pmc->interface);
1102
/* clear dead sources, too */
1103
read_lock(&in_dev->mc_list_lock);
1104
for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105
struct ip_sf_list *psf, *psf_next;
1107
spin_lock_bh(&pmc->lock);
1110
spin_unlock_bh(&pmc->lock);
1111
for (; psf; psf=psf_next) {
1112
psf_next = psf->sf_next;
1116
read_unlock(&in_dev->mc_list_lock);
1120
static void igmp_group_dropped(struct ip_mc_list *im)
1122
struct in_device *in_dev = im->interface;
1123
#ifdef CONFIG_IP_MULTICAST
1129
ip_mc_filter_del(in_dev, im->multiaddr);
1132
#ifdef CONFIG_IP_MULTICAST
1133
if (im->multiaddr == IGMP_ALL_HOSTS)
1136
reporter = im->reporter;
1137
igmp_stop_timer(im);
1139
if (!in_dev->dead) {
1140
if (IGMP_V1_SEEN(in_dev))
1142
if (IGMP_V2_SEEN(in_dev)) {
1144
igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1148
igmpv3_add_delrec(in_dev, im);
1150
igmp_ifc_event(in_dev);
1154
ip_mc_clear_src(im);
1157
static void igmp_group_added(struct ip_mc_list *im)
1159
struct in_device *in_dev = im->interface;
1161
if (im->loaded == 0) {
1163
ip_mc_filter_add(in_dev, im->multiaddr);
1166
#ifdef CONFIG_IP_MULTICAST
1167
if (im->multiaddr == IGMP_ALL_HOSTS)
1172
if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173
spin_lock_bh(&im->lock);
1174
igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175
spin_unlock_bh(&im->lock);
1180
im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181
IGMP_Unsolicited_Report_Count;
1182
igmp_ifc_event(in_dev);
1188
* Multicast list managers
1193
* A socket has joined a multicast group on device dev.
1196
void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1198
struct ip_mc_list *im;
1202
for (im=in_dev->mc_list; im; im=im->next) {
1203
if (im->multiaddr == addr) {
1205
ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1210
im = kmalloc(sizeof(*im), GFP_KERNEL);
1215
im->interface = in_dev;
1216
in_dev_hold(in_dev);
1217
im->multiaddr = addr;
1218
/* initial mode is (EX, empty) */
1219
im->sfmode = MCAST_EXCLUDE;
1220
im->sfcount[MCAST_INCLUDE] = 0;
1221
im->sfcount[MCAST_EXCLUDE] = 1;
1225
atomic_set(&im->refcnt, 1);
1226
spin_lock_init(&im->lock);
1227
#ifdef CONFIG_IP_MULTICAST
1229
setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230
im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1235
write_lock_bh(&in_dev->mc_list_lock);
1236
im->next = in_dev->mc_list;
1237
in_dev->mc_list = im;
1239
write_unlock_bh(&in_dev->mc_list_lock);
1240
#ifdef CONFIG_IP_MULTICAST
1241
igmpv3_del_delrec(in_dev, im->multiaddr);
1243
igmp_group_added(im);
1245
ip_rt_multicast_event(in_dev);
1251
* Resend IGMP JOIN report; used for bonding.
1253
void ip_mc_rejoin_group(struct ip_mc_list *im)
1255
#ifdef CONFIG_IP_MULTICAST
1256
struct in_device *in_dev = im->interface;
1258
if (im->multiaddr == IGMP_ALL_HOSTS)
1261
if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1262
igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1266
im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1267
IGMP_Unsolicited_Report_Count;
1268
igmp_ifc_event(in_dev);
1273
* A socket has left a multicast group on device dev
1276
void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1278
struct ip_mc_list *i, **ip;
1282
for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1283
if (i->multiaddr == addr) {
1284
if (--i->users == 0) {
1285
write_lock_bh(&in_dev->mc_list_lock);
1288
write_unlock_bh(&in_dev->mc_list_lock);
1289
igmp_group_dropped(i);
1292
ip_rt_multicast_event(in_dev);
1302
/* Device changing type */
1304
void ip_mc_unmap(struct in_device *in_dev)
1306
struct ip_mc_list *i;
1310
for (i = in_dev->mc_list; i; i = i->next)
1311
igmp_group_dropped(i);
1314
void ip_mc_remap(struct in_device *in_dev)
1316
struct ip_mc_list *i;
1320
for (i = in_dev->mc_list; i; i = i->next)
1321
igmp_group_added(i);
1324
/* Device going down */
1326
void ip_mc_down(struct in_device *in_dev)
1328
struct ip_mc_list *i;
1332
for (i=in_dev->mc_list; i; i=i->next)
1333
igmp_group_dropped(i);
1335
#ifdef CONFIG_IP_MULTICAST
1336
in_dev->mr_ifc_count = 0;
1337
if (del_timer(&in_dev->mr_ifc_timer))
1338
__in_dev_put(in_dev);
1339
in_dev->mr_gq_running = 0;
1340
if (del_timer(&in_dev->mr_gq_timer))
1341
__in_dev_put(in_dev);
1342
igmpv3_clear_delrec(in_dev);
1345
ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1348
void ip_mc_init_dev(struct in_device *in_dev)
1352
in_dev->mc_tomb = NULL;
1353
#ifdef CONFIG_IP_MULTICAST
1354
in_dev->mr_gq_running = 0;
1355
setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1356
(unsigned long)in_dev);
1357
in_dev->mr_ifc_count = 0;
1358
in_dev->mc_count = 0;
1359
setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1360
(unsigned long)in_dev);
1361
in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1364
rwlock_init(&in_dev->mc_list_lock);
1365
spin_lock_init(&in_dev->mc_tomb_lock);
1368
/* Device going up */
1370
void ip_mc_up(struct in_device *in_dev)
1372
struct ip_mc_list *i;
1376
ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1378
for (i=in_dev->mc_list; i; i=i->next)
1379
igmp_group_added(i);
1383
* Device is about to be destroyed: clean up.
1386
void ip_mc_destroy_dev(struct in_device *in_dev)
1388
struct ip_mc_list *i;
1392
/* Deactivate timers */
1395
write_lock_bh(&in_dev->mc_list_lock);
1396
while ((i = in_dev->mc_list) != NULL) {
1397
in_dev->mc_list = i->next;
1399
write_unlock_bh(&in_dev->mc_list_lock);
1400
igmp_group_dropped(i);
1403
write_lock_bh(&in_dev->mc_list_lock);
1405
write_unlock_bh(&in_dev->mc_list_lock);
1408
static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1410
struct flowi fl = { .nl_u = { .ip4_u =
1411
{ .daddr = imr->imr_multiaddr.s_addr } } };
1413
struct net_device *dev = NULL;
1414
struct in_device *idev = NULL;
1416
if (imr->imr_ifindex) {
1417
idev = inetdev_by_index(net, imr->imr_ifindex);
1422
if (imr->imr_address.s_addr) {
1423
dev = ip_dev_find(net, imr->imr_address.s_addr);
1429
if (!dev && !ip_route_output_key(net, &rt, &fl)) {
1430
dev = rt->u.dst.dev;
1434
imr->imr_ifindex = dev->ifindex;
1435
idev = __in_dev_get_rtnl(dev);
1441
* Join a socket to a group
1443
int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1444
int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1447
static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1450
struct ip_sf_list *psf, *psf_prev;
1454
for (psf=pmc->sources; psf; psf=psf->sf_next) {
1455
if (psf->sf_inaddr == *psfsrc)
1459
if (!psf || psf->sf_count[sfmode] == 0) {
1460
/* source filter not found, or count wrong => bug */
1463
psf->sf_count[sfmode]--;
1464
if (psf->sf_count[sfmode] == 0) {
1465
ip_rt_multicast_event(pmc->interface);
1467
if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1468
#ifdef CONFIG_IP_MULTICAST
1469
struct in_device *in_dev = pmc->interface;
1472
/* no more filters for this source */
1474
psf_prev->sf_next = psf->sf_next;
1476
pmc->sources = psf->sf_next;
1477
#ifdef CONFIG_IP_MULTICAST
1478
if (psf->sf_oldin &&
1479
!IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1480
psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1481
IGMP_Unsolicited_Report_Count;
1482
psf->sf_next = pmc->tomb;
1492
#ifndef CONFIG_IP_MULTICAST
1493
#define igmp_ifc_event(x) do { } while (0)
1496
static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1497
int sfcount, __be32 *psfsrc, int delta)
1499
struct ip_mc_list *pmc;
1505
read_lock(&in_dev->mc_list_lock);
1506
for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1507
if (*pmca == pmc->multiaddr)
1511
/* MCA not found?? bug */
1512
read_unlock(&in_dev->mc_list_lock);
1515
spin_lock_bh(&pmc->lock);
1516
read_unlock(&in_dev->mc_list_lock);
1517
#ifdef CONFIG_IP_MULTICAST
1522
if (!pmc->sfcount[sfmode])
1524
pmc->sfcount[sfmode]--;
1527
for (i=0; i<sfcount; i++) {
1528
int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1530
changerec |= rv > 0;
1534
if (pmc->sfmode == MCAST_EXCLUDE &&
1535
pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1536
pmc->sfcount[MCAST_INCLUDE]) {
1537
#ifdef CONFIG_IP_MULTICAST
1538
struct ip_sf_list *psf;
1541
/* filter mode change */
1542
pmc->sfmode = MCAST_INCLUDE;
1543
#ifdef CONFIG_IP_MULTICAST
1544
pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1545
IGMP_Unsolicited_Report_Count;
1546
in_dev->mr_ifc_count = pmc->crcount;
1547
for (psf=pmc->sources; psf; psf = psf->sf_next)
1548
psf->sf_crcount = 0;
1549
igmp_ifc_event(pmc->interface);
1550
} else if (sf_setstate(pmc) || changerec) {
1551
igmp_ifc_event(pmc->interface);
1555
spin_unlock_bh(&pmc->lock);
1560
* Add multicast single-source filter to the interface list
1562
static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1563
__be32 *psfsrc, int delta)
1565
struct ip_sf_list *psf, *psf_prev;
1568
for (psf=pmc->sources; psf; psf=psf->sf_next) {
1569
if (psf->sf_inaddr == *psfsrc)
1574
psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1577
psf->sf_inaddr = *psfsrc;
1579
psf_prev->sf_next = psf;
1583
psf->sf_count[sfmode]++;
1584
if (psf->sf_count[sfmode] == 1) {
1585
ip_rt_multicast_event(pmc->interface);
1590
#ifdef CONFIG_IP_MULTICAST
1591
static void sf_markstate(struct ip_mc_list *pmc)
1593
struct ip_sf_list *psf;
1594
int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1596
for (psf=pmc->sources; psf; psf=psf->sf_next)
1597
if (pmc->sfcount[MCAST_EXCLUDE]) {
1598
psf->sf_oldin = mca_xcount ==
1599
psf->sf_count[MCAST_EXCLUDE] &&
1600
!psf->sf_count[MCAST_INCLUDE];
1602
psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1605
static int sf_setstate(struct ip_mc_list *pmc)
1607
struct ip_sf_list *psf, *dpsf;
1608
int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1609
int qrv = pmc->interface->mr_qrv;
1613
for (psf=pmc->sources; psf; psf=psf->sf_next) {
1614
if (pmc->sfcount[MCAST_EXCLUDE]) {
1615
new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1616
!psf->sf_count[MCAST_INCLUDE];
1618
new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1620
if (!psf->sf_oldin) {
1621
struct ip_sf_list *prev = NULL;
1623
for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1624
if (dpsf->sf_inaddr == psf->sf_inaddr)
1630
prev->sf_next = dpsf->sf_next;
1632
pmc->tomb = dpsf->sf_next;
1635
psf->sf_crcount = qrv;
1638
} else if (psf->sf_oldin) {
1640
psf->sf_crcount = 0;
1642
* add or update "delete" records if an active filter
1645
for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1646
if (dpsf->sf_inaddr == psf->sf_inaddr)
1649
dpsf = (struct ip_sf_list *)
1650
kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1654
/* pmc->lock held by callers */
1655
dpsf->sf_next = pmc->tomb;
1658
dpsf->sf_crcount = qrv;
1667
* Add multicast source filter list to the interface list
1669
static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1670
int sfcount, __be32 *psfsrc, int delta)
1672
struct ip_mc_list *pmc;
1678
read_lock(&in_dev->mc_list_lock);
1679
for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1680
if (*pmca == pmc->multiaddr)
1684
/* MCA not found?? bug */
1685
read_unlock(&in_dev->mc_list_lock);
1688
spin_lock_bh(&pmc->lock);
1689
read_unlock(&in_dev->mc_list_lock);
1691
#ifdef CONFIG_IP_MULTICAST
1694
isexclude = pmc->sfmode == MCAST_EXCLUDE;
1696
pmc->sfcount[sfmode]++;
1698
for (i=0; i<sfcount; i++) {
1699
err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1706
pmc->sfcount[sfmode]--;
1708
(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1709
} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1710
#ifdef CONFIG_IP_MULTICAST
1711
struct ip_sf_list *psf;
1712
in_dev = pmc->interface;
1715
/* filter mode change */
1716
if (pmc->sfcount[MCAST_EXCLUDE])
1717
pmc->sfmode = MCAST_EXCLUDE;
1718
else if (pmc->sfcount[MCAST_INCLUDE])
1719
pmc->sfmode = MCAST_INCLUDE;
1720
#ifdef CONFIG_IP_MULTICAST
1721
/* else no filters; keep old mode for reports */
1723
pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1724
IGMP_Unsolicited_Report_Count;
1725
in_dev->mr_ifc_count = pmc->crcount;
1726
for (psf=pmc->sources; psf; psf = psf->sf_next)
1727
psf->sf_crcount = 0;
1728
igmp_ifc_event(in_dev);
1729
} else if (sf_setstate(pmc)) {
1730
igmp_ifc_event(in_dev);
1733
spin_unlock_bh(&pmc->lock);
1737
static void ip_mc_clear_src(struct ip_mc_list *pmc)
1739
struct ip_sf_list *psf, *nextpsf;
1741
for (psf=pmc->tomb; psf; psf=nextpsf) {
1742
nextpsf = psf->sf_next;
1746
for (psf=pmc->sources; psf; psf=nextpsf) {
1747
nextpsf = psf->sf_next;
1750
pmc->sources = NULL;
1751
pmc->sfmode = MCAST_EXCLUDE;
1752
pmc->sfcount[MCAST_INCLUDE] = 0;
1753
pmc->sfcount[MCAST_EXCLUDE] = 1;
1758
* Join a multicast group
1760
int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1763
__be32 addr = imr->imr_multiaddr.s_addr;
1764
struct ip_mc_socklist *iml = NULL, *i;
1765
struct in_device *in_dev;
1766
struct inet_sock *inet = inet_sk(sk);
1767
struct net *net = sock_net(sk);
1771
if (!ipv4_is_multicast(addr))
1776
in_dev = ip_mc_find_dev(net, imr);
1785
ifindex = imr->imr_ifindex;
1786
for (i = inet->mc_list; i; i = i->next) {
1787
if (i->multi.imr_multiaddr.s_addr == addr &&
1788
i->multi.imr_ifindex == ifindex)
1793
if (count >= sysctl_igmp_max_memberships)
1795
iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1799
memcpy(&iml->multi, imr, sizeof(*imr));
1800
iml->next = inet->mc_list;
1802
iml->sfmode = MCAST_EXCLUDE;
1803
rcu_assign_pointer(inet->mc_list, iml);
1804
ip_mc_inc_group(in_dev, addr);
1811
static void ip_sf_socklist_reclaim(struct rcu_head *rp)
1813
struct ip_sf_socklist *psf;
1815
psf = container_of(rp, struct ip_sf_socklist, rcu);
1816
/* sk_omem_alloc should have been decreased by the caller*/
1820
static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1821
struct in_device *in_dev)
1823
struct ip_sf_socklist *psf = iml->sflist;
1827
/* any-source empty exclude case */
1828
return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1829
iml->sfmode, 0, NULL, 0);
1831
err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1832
iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1833
rcu_assign_pointer(iml->sflist, NULL);
1834
/* decrease mem now to avoid the memleak warning */
1835
atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1836
call_rcu(&psf->rcu, ip_sf_socklist_reclaim);
1841
static void ip_mc_socklist_reclaim(struct rcu_head *rp)
1843
struct ip_mc_socklist *iml;
1845
iml = container_of(rp, struct ip_mc_socklist, rcu);
1846
/* sk_omem_alloc should have been decreased by the caller*/
1852
* Ask a socket to leave a group.
1855
int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1857
struct inet_sock *inet = inet_sk(sk);
1858
struct ip_mc_socklist *iml, **imlp;
1859
struct in_device *in_dev;
1860
struct net *net = sock_net(sk);
1861
__be32 group = imr->imr_multiaddr.s_addr;
1863
int ret = -EADDRNOTAVAIL;
1866
in_dev = ip_mc_find_dev(net, imr);
1867
ifindex = imr->imr_ifindex;
1868
for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1869
if (iml->multi.imr_multiaddr.s_addr != group)
1872
if (iml->multi.imr_ifindex != ifindex)
1874
} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1875
iml->multi.imr_address.s_addr)
1878
(void) ip_mc_leave_src(sk, iml, in_dev);
1880
rcu_assign_pointer(*imlp, iml->next);
1883
ip_mc_dec_group(in_dev, group);
1885
/* decrease mem now to avoid the memleak warning */
1886
atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1887
call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
1896
int ip_mc_source(int add, int omode, struct sock *sk, struct
1897
ip_mreq_source *mreqs, int ifindex)
1900
struct ip_mreqn imr;
1901
__be32 addr = mreqs->imr_multiaddr;
1902
struct ip_mc_socklist *pmc;
1903
struct in_device *in_dev = NULL;
1904
struct inet_sock *inet = inet_sk(sk);
1905
struct ip_sf_socklist *psl;
1906
struct net *net = sock_net(sk);
1910
if (!ipv4_is_multicast(addr))
1915
imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1916
imr.imr_address.s_addr = mreqs->imr_interface;
1917
imr.imr_ifindex = ifindex;
1918
in_dev = ip_mc_find_dev(net, &imr);
1924
err = -EADDRNOTAVAIL;
1926
for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1927
if ((pmc->multi.imr_multiaddr.s_addr ==
1928
imr.imr_multiaddr.s_addr) &&
1929
(pmc->multi.imr_ifindex == imr.imr_ifindex))
1932
if (!pmc) { /* must have a prior join */
1936
/* if a source filter was set, must be the same mode as before */
1938
if (pmc->sfmode != omode) {
1942
} else if (pmc->sfmode != omode) {
1943
/* allow mode switches for empty-set filters */
1944
ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1945
ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1947
pmc->sfmode = omode;
1953
goto done; /* err = -EADDRNOTAVAIL */
1955
for (i=0; i<psl->sl_count; i++) {
1956
rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1961
if (rv) /* source not found */
1962
goto done; /* err = -EADDRNOTAVAIL */
1964
/* special case - (INCLUDE, empty) == LEAVE_GROUP */
1965
if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1970
/* update the interface filter */
1971
ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1972
&mreqs->imr_sourceaddr, 1);
1974
for (j=i+1; j<psl->sl_count; j++)
1975
psl->sl_addr[j-1] = psl->sl_addr[j];
1980
/* else, add a new source to the filter */
1982
if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1986
if (!psl || psl->sl_count == psl->sl_max) {
1987
struct ip_sf_socklist *newpsl;
1988
int count = IP_SFBLOCK;
1991
count += psl->sl_max;
1992
newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1997
newpsl->sl_max = count;
1998
newpsl->sl_count = count - IP_SFBLOCK;
2000
for (i=0; i<psl->sl_count; i++)
2001
newpsl->sl_addr[i] = psl->sl_addr[i];
2002
/* decrease mem now to avoid the memleak warning */
2003
atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2004
call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2006
rcu_assign_pointer(pmc->sflist, newpsl);
2009
rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2010
for (i=0; i<psl->sl_count; i++) {
2011
rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2016
if (rv == 0) /* address already there is an error */
2018
for (j=psl->sl_count-1; j>=i; j--)
2019
psl->sl_addr[j+1] = psl->sl_addr[j];
2020
psl->sl_addr[i] = mreqs->imr_sourceaddr;
2023
/* update the interface list */
2024
ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2025
&mreqs->imr_sourceaddr, 1);
2029
return ip_mc_leave_group(sk, &imr);
2033
int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2036
struct ip_mreqn imr;
2037
__be32 addr = msf->imsf_multiaddr;
2038
struct ip_mc_socklist *pmc;
2039
struct in_device *in_dev;
2040
struct inet_sock *inet = inet_sk(sk);
2041
struct ip_sf_socklist *newpsl, *psl;
2042
struct net *net = sock_net(sk);
2045
if (!ipv4_is_multicast(addr))
2047
if (msf->imsf_fmode != MCAST_INCLUDE &&
2048
msf->imsf_fmode != MCAST_EXCLUDE)
2053
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2054
imr.imr_address.s_addr = msf->imsf_interface;
2055
imr.imr_ifindex = ifindex;
2056
in_dev = ip_mc_find_dev(net, &imr);
2063
/* special case - (INCLUDE, empty) == LEAVE_GROUP */
2064
if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2069
for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2070
if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2071
pmc->multi.imr_ifindex == imr.imr_ifindex)
2074
if (!pmc) { /* must have a prior join */
2078
if (msf->imsf_numsrc) {
2079
newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2085
newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2086
memcpy(newpsl->sl_addr, msf->imsf_slist,
2087
msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2088
err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2089
msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2091
sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2096
(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2097
msf->imsf_fmode, 0, NULL, 0);
2101
(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2102
psl->sl_count, psl->sl_addr, 0);
2103
/* decrease mem now to avoid the memleak warning */
2104
atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2105
call_rcu(&psl->rcu, ip_sf_socklist_reclaim);
2107
(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2109
rcu_assign_pointer(pmc->sflist, newpsl);
2110
pmc->sfmode = msf->imsf_fmode;
2115
err = ip_mc_leave_group(sk, &imr);
2119
int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2120
struct ip_msfilter __user *optval, int __user *optlen)
2122
int err, len, count, copycount;
2123
struct ip_mreqn imr;
2124
__be32 addr = msf->imsf_multiaddr;
2125
struct ip_mc_socklist *pmc;
2126
struct in_device *in_dev;
2127
struct inet_sock *inet = inet_sk(sk);
2128
struct ip_sf_socklist *psl;
2129
struct net *net = sock_net(sk);
2131
if (!ipv4_is_multicast(addr))
2136
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2137
imr.imr_address.s_addr = msf->imsf_interface;
2138
imr.imr_ifindex = 0;
2139
in_dev = ip_mc_find_dev(net, &imr);
2145
err = -EADDRNOTAVAIL;
2147
for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2148
if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2149
pmc->multi.imr_ifindex == imr.imr_ifindex)
2152
if (!pmc) /* must have a prior join */
2154
msf->imsf_fmode = pmc->sfmode;
2161
count = psl->sl_count;
2163
copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2164
len = copycount * sizeof(psl->sl_addr[0]);
2165
msf->imsf_numsrc = count;
2166
if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2167
copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2171
copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2179
int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2180
struct group_filter __user *optval, int __user *optlen)
2182
int err, i, count, copycount;
2183
struct sockaddr_in *psin;
2185
struct ip_mc_socklist *pmc;
2186
struct inet_sock *inet = inet_sk(sk);
2187
struct ip_sf_socklist *psl;
2189
psin = (struct sockaddr_in *)&gsf->gf_group;
2190
if (psin->sin_family != AF_INET)
2192
addr = psin->sin_addr.s_addr;
2193
if (!ipv4_is_multicast(addr))
2198
err = -EADDRNOTAVAIL;
2200
for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2201
if (pmc->multi.imr_multiaddr.s_addr == addr &&
2202
pmc->multi.imr_ifindex == gsf->gf_interface)
2205
if (!pmc) /* must have a prior join */
2207
gsf->gf_fmode = pmc->sfmode;
2210
count = psl ? psl->sl_count : 0;
2211
copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2212
gsf->gf_numsrc = count;
2213
if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2214
copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2217
for (i=0; i<copycount; i++) {
2218
struct sockaddr_storage ss;
2220
psin = (struct sockaddr_in *)&ss;
2221
memset(&ss, 0, sizeof(ss));
2222
psin->sin_family = AF_INET;
2223
psin->sin_addr.s_addr = psl->sl_addr[i];
2224
if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2234
* check if a multicast source filter allows delivery for a given <src,dst,intf>
2236
int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2238
struct inet_sock *inet = inet_sk(sk);
2239
struct ip_mc_socklist *pmc;
2240
struct ip_sf_socklist *psl;
2245
if (!ipv4_is_multicast(loc_addr))
2249
for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) {
2250
if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2251
pmc->multi.imr_ifindex == dif)
2258
ret = (pmc->sfmode == MCAST_EXCLUDE);
2262
for (i=0; i<psl->sl_count; i++) {
2263
if (psl->sl_addr[i] == rmt_addr)
2267
if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2269
if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2279
* A socket is closing.
2282
void ip_mc_drop_socket(struct sock *sk)
2284
struct inet_sock *inet = inet_sk(sk);
2285
struct ip_mc_socklist *iml;
2286
struct net *net = sock_net(sk);
2288
if (inet->mc_list == NULL)
2292
while ((iml = inet->mc_list) != NULL) {
2293
struct in_device *in_dev;
2294
rcu_assign_pointer(inet->mc_list, iml->next);
2296
in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2297
(void) ip_mc_leave_src(sk, iml, in_dev);
2298
if (in_dev != NULL) {
2299
ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2302
/* decrease mem now to avoid the memleak warning */
2303
atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2304
call_rcu(&iml->rcu, ip_mc_socklist_reclaim);
2309
int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2311
struct ip_mc_list *im;
2312
struct ip_sf_list *psf;
2315
read_lock(&in_dev->mc_list_lock);
2316
for (im=in_dev->mc_list; im; im=im->next) {
2317
if (im->multiaddr == mc_addr)
2320
if (im && proto == IPPROTO_IGMP) {
2324
for (psf=im->sources; psf; psf=psf->sf_next) {
2325
if (psf->sf_inaddr == src_addr)
2329
rv = psf->sf_count[MCAST_INCLUDE] ||
2330
psf->sf_count[MCAST_EXCLUDE] !=
2331
im->sfcount[MCAST_EXCLUDE];
2333
rv = im->sfcount[MCAST_EXCLUDE] != 0;
2335
rv = 1; /* unspecified source; tentatively allow */
2337
read_unlock(&in_dev->mc_list_lock);
2341
#if defined(CONFIG_PROC_FS)
2342
struct igmp_mc_iter_state {
2343
struct seq_net_private p;
2344
struct net_device *dev;
2345
struct in_device *in_dev;
2348
#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2350
static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2352
struct net *net = seq_file_net(seq);
2353
struct ip_mc_list *im = NULL;
2354
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2356
state->in_dev = NULL;
2357
for_each_netdev_rcu(net, state->dev) {
2358
struct in_device *in_dev;
2360
in_dev = __in_dev_get_rcu(state->dev);
2363
read_lock(&in_dev->mc_list_lock);
2364
im = in_dev->mc_list;
2366
state->in_dev = in_dev;
2369
read_unlock(&in_dev->mc_list_lock);
2374
static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2376
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2379
if (likely(state->in_dev != NULL))
2380
read_unlock(&state->in_dev->mc_list_lock);
2382
state->dev = next_net_device_rcu(state->dev);
2384
state->in_dev = NULL;
2387
state->in_dev = __in_dev_get_rcu(state->dev);
2390
read_lock(&state->in_dev->mc_list_lock);
2391
im = state->in_dev->mc_list;
2396
static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2398
struct ip_mc_list *im = igmp_mc_get_first(seq);
2400
while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2402
return pos ? NULL : im;
2405
static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2409
return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2412
static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2414
struct ip_mc_list *im;
2415
if (v == SEQ_START_TOKEN)
2416
im = igmp_mc_get_first(seq);
2418
im = igmp_mc_get_next(seq, v);
2423
static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2426
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2427
if (likely(state->in_dev != NULL)) {
2428
read_unlock(&state->in_dev->mc_list_lock);
2429
state->in_dev = NULL;
2435
static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2437
if (v == SEQ_START_TOKEN)
2439
"Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2441
struct ip_mc_list *im = (struct ip_mc_list *)v;
2442
struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2444
#ifdef CONFIG_IP_MULTICAST
2445
querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2446
IGMP_V2_SEEN(state->in_dev) ? "V2" :
2452
if (state->in_dev->mc_list == im) {
2453
seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2454
state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2458
"\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2459
im->multiaddr, im->users,
2460
im->tm_running, im->tm_running ?
2461
jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2467
static const struct seq_operations igmp_mc_seq_ops = {
2468
.start = igmp_mc_seq_start,
2469
.next = igmp_mc_seq_next,
2470
.stop = igmp_mc_seq_stop,
2471
.show = igmp_mc_seq_show,
2474
static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2476
return seq_open_net(inode, file, &igmp_mc_seq_ops,
2477
sizeof(struct igmp_mc_iter_state));
2480
static const struct file_operations igmp_mc_seq_fops = {
2481
.owner = THIS_MODULE,
2482
.open = igmp_mc_seq_open,
2484
.llseek = seq_lseek,
2485
.release = seq_release_net,
2488
struct igmp_mcf_iter_state {
2489
struct seq_net_private p;
2490
struct net_device *dev;
2491
struct in_device *idev;
2492
struct ip_mc_list *im;
2495
#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2497
static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2499
struct net *net = seq_file_net(seq);
2500
struct ip_sf_list *psf = NULL;
2501
struct ip_mc_list *im = NULL;
2502
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2506
for_each_netdev_rcu(net, state->dev) {
2507
struct in_device *idev;
2508
idev = __in_dev_get_rcu(state->dev);
2509
if (unlikely(idev == NULL))
2511
read_lock(&idev->mc_list_lock);
2513
if (likely(im != NULL)) {
2514
spin_lock_bh(&im->lock);
2516
if (likely(psf != NULL)) {
2521
spin_unlock_bh(&im->lock);
2523
read_unlock(&idev->mc_list_lock);
2528
static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2530
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2534
spin_unlock_bh(&state->im->lock);
2535
state->im = state->im->next;
2536
while (!state->im) {
2537
if (likely(state->idev != NULL))
2538
read_unlock(&state->idev->mc_list_lock);
2540
state->dev = next_net_device_rcu(state->dev);
2545
state->idev = __in_dev_get_rcu(state->dev);
2548
read_lock(&state->idev->mc_list_lock);
2549
state->im = state->idev->mc_list;
2553
spin_lock_bh(&state->im->lock);
2554
psf = state->im->sources;
2560
static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2562
struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2564
while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2566
return pos ? NULL : psf;
2569
static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2573
return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2576
static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2578
struct ip_sf_list *psf;
2579
if (v == SEQ_START_TOKEN)
2580
psf = igmp_mcf_get_first(seq);
2582
psf = igmp_mcf_get_next(seq, v);
2587
static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2590
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591
if (likely(state->im != NULL)) {
2592
spin_unlock_bh(&state->im->lock);
2595
if (likely(state->idev != NULL)) {
2596
read_unlock(&state->idev->mc_list_lock);
2603
static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2605
struct ip_sf_list *psf = (struct ip_sf_list *)v;
2606
struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2608
if (v == SEQ_START_TOKEN) {
2611
"%10s %10s %6s %6s\n", "Idx",
2613
"SRC", "INC", "EXC");
2617
"0x%08x %6lu %6lu\n",
2618
state->dev->ifindex, state->dev->name,
2619
ntohl(state->im->multiaddr),
2620
ntohl(psf->sf_inaddr),
2621
psf->sf_count[MCAST_INCLUDE],
2622
psf->sf_count[MCAST_EXCLUDE]);
2627
static const struct seq_operations igmp_mcf_seq_ops = {
2628
.start = igmp_mcf_seq_start,
2629
.next = igmp_mcf_seq_next,
2630
.stop = igmp_mcf_seq_stop,
2631
.show = igmp_mcf_seq_show,
2634
static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2636
return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2637
sizeof(struct igmp_mcf_iter_state));
2640
static const struct file_operations igmp_mcf_seq_fops = {
2641
.owner = THIS_MODULE,
2642
.open = igmp_mcf_seq_open,
2644
.llseek = seq_lseek,
2645
.release = seq_release_net,
2648
static int __net_init igmp_net_init(struct net *net)
2650
struct proc_dir_entry *pde;
2652
pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2655
pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2661
proc_net_remove(net, "igmp");
2666
static void __net_exit igmp_net_exit(struct net *net)
2668
proc_net_remove(net, "mcfilter");
2669
proc_net_remove(net, "igmp");
2672
static struct pernet_operations igmp_net_ops = {
2673
.init = igmp_net_init,
2674
.exit = igmp_net_exit,
2677
int __init igmp_mc_proc_init(void)
2679
return register_pernet_subsys(&igmp_net_ops);
2683
EXPORT_SYMBOL(ip_mc_dec_group);
2684
EXPORT_SYMBOL(ip_mc_inc_group);
2685
EXPORT_SYMBOL(ip_mc_join_group);
2686
EXPORT_SYMBOL(ip_mc_rejoin_group);