2 * Linux NET3: Internet Group Management Protocol [IGMP]
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
14 * Alan Cox <Alan.Cox@linux.org>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 * David L Stevens: IGMPv3 support, with help from
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
99 #include <net/checksum.h>
100 #include <linux/netfilter_ipv4.h>
101 #ifdef CONFIG_IP_MROUTE
102 #include <linux/mroute.h>
104 #ifdef CONFIG_PROC_FS
105 #include <linux/proc_fs.h>
106 #include <linux/seq_file.h>
109 #define IP_MAX_MEMBERSHIPS 20
110 #define IP_MAX_MSF 10
112 #ifdef CONFIG_IP_MULTICAST
113 /* Parameter names and values are taken from igmp-v2-06 draft */
115 #define IGMP_V1_Router_Present_Timeout (400*HZ)
116 #define IGMP_V2_Router_Present_Timeout (400*HZ)
117 #define IGMP_Unsolicited_Report_Interval (10*HZ)
118 #define IGMP_Query_Response_Interval (10*HZ)
119 #define IGMP_Unsolicited_Report_Count 2
122 #define IGMP_Initial_Report_Delay (1)
124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
131 #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \
132 (in_dev)->cnf.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) (ipv4_devconf.force_igmp_version == 2 || \
136 (in_dev)->cnf.force_igmp_version == 2 || \
137 ((in_dev)->mr_v2_seen && \
138 time_before(jiffies, (in_dev)->mr_v2_seen)))
140 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
141 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
);
142 static void igmpv3_clear_delrec(struct in_device
*in_dev
);
143 static int sf_setstate(struct ip_mc_list
*pmc
);
144 static void sf_markstate(struct ip_mc_list
*pmc
);
146 static void ip_mc_clear_src(struct ip_mc_list
*pmc
);
147 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
148 int sfcount
, __be32
*psfsrc
, int delta
);
150 static void ip_ma_put(struct ip_mc_list
*im
)
152 if (atomic_dec_and_test(&im
->refcnt
)) {
153 in_dev_put(im
->interface
);
158 #ifdef CONFIG_IP_MULTICAST
164 static __inline__
void igmp_stop_timer(struct ip_mc_list
*im
)
166 spin_lock_bh(&im
->lock
);
167 if (del_timer(&im
->timer
))
168 atomic_dec(&im
->refcnt
);
171 im
->unsolicit_count
= 0;
172 spin_unlock_bh(&im
->lock
);
175 /* It must be called with locked im->lock */
176 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
178 int tv
=net_random() % max_delay
;
181 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
182 atomic_inc(&im
->refcnt
);
185 static void igmp_gq_start_timer(struct in_device
*in_dev
)
187 int tv
= net_random() % in_dev
->mr_maxdelay
;
189 in_dev
->mr_gq_running
= 1;
190 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
194 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
196 int tv
= net_random() % delay
;
198 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
202 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
204 spin_lock_bh(&im
->lock
);
205 im
->unsolicit_count
= 0;
206 if (del_timer(&im
->timer
)) {
207 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
208 add_timer(&im
->timer
);
210 spin_unlock_bh(&im
->lock
);
213 atomic_dec(&im
->refcnt
);
215 igmp_start_timer(im
, max_delay
);
216 spin_unlock_bh(&im
->lock
);
221 * Send an IGMP report.
224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
227 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
228 int gdeleted
, int sdeleted
)
231 case IGMPV3_MODE_IS_INCLUDE
:
232 case IGMPV3_MODE_IS_EXCLUDE
:
233 if (gdeleted
|| sdeleted
)
235 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
236 if (pmc
->sfmode
== MCAST_INCLUDE
)
238 /* don't include if this source is excluded
241 if (psf
->sf_count
[MCAST_INCLUDE
])
242 return type
== IGMPV3_MODE_IS_INCLUDE
;
243 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
244 psf
->sf_count
[MCAST_EXCLUDE
];
247 case IGMPV3_CHANGE_TO_INCLUDE
:
248 if (gdeleted
|| sdeleted
)
250 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
251 case IGMPV3_CHANGE_TO_EXCLUDE
:
252 if (gdeleted
|| sdeleted
)
254 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
255 psf
->sf_count
[MCAST_INCLUDE
])
257 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
258 psf
->sf_count
[MCAST_EXCLUDE
];
259 case IGMPV3_ALLOW_NEW_SOURCES
:
260 if (gdeleted
|| !psf
->sf_crcount
)
262 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
263 case IGMPV3_BLOCK_OLD_SOURCES
:
264 if (pmc
->sfmode
== MCAST_INCLUDE
)
265 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
266 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
272 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
274 struct ip_sf_list
*psf
;
277 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
278 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
285 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
290 struct igmpv3_report
*pig
;
292 skb
= alloc_skb(size
+ LL_RESERVED_SPACE(dev
), GFP_ATOMIC
);
297 struct flowi fl
= { .oif
= dev
->ifindex
,
299 .daddr
= IGMPV3_ALL_MCR
} },
300 .proto
= IPPROTO_IGMP
};
301 if (ip_route_output_key(&rt
, &fl
)) {
306 if (rt
->rt_src
== 0) {
312 skb
->dst
= &rt
->u
.dst
;
315 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
317 skb_reset_network_header(skb
);
319 skb_put(skb
, sizeof(struct iphdr
) + 4);
322 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
324 pip
->frag_off
= htons(IP_DF
);
326 pip
->daddr
= rt
->rt_dst
;
327 pip
->saddr
= rt
->rt_src
;
328 pip
->protocol
= IPPROTO_IGMP
;
329 pip
->tot_len
= 0; /* filled in later */
330 ip_select_ident(pip
, &rt
->u
.dst
, NULL
);
331 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
332 ((u8
*)&pip
[1])[1] = 4;
333 ((u8
*)&pip
[1])[2] = 0;
334 ((u8
*)&pip
[1])[3] = 0;
336 skb
->h
.raw
= skb
->nh
.raw
+ sizeof(struct iphdr
) + 4;
337 skb_put(skb
, sizeof(*pig
));
338 pig
= igmpv3_report_hdr(skb
);
339 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
347 static int igmpv3_sendpack(struct sk_buff
*skb
)
349 struct iphdr
*pip
= ip_hdr(skb
);
350 struct igmphdr
*pig
= igmp_hdr(skb
);
351 const int iplen
= skb
->tail
- skb
->nh
.raw
;
352 const int igmplen
= skb
->tail
- skb_transport_header(skb
);
354 pip
->tot_len
= htons(iplen
);
356 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
358 return NF_HOOK(PF_INET
, NF_IP_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
362 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
364 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
,type
,gdel
,sdel
);
367 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
368 int type
, struct igmpv3_grec
**ppgr
)
370 struct net_device
*dev
= pmc
->interface
->dev
;
371 struct igmpv3_report
*pih
;
372 struct igmpv3_grec
*pgr
;
375 skb
= igmpv3_newpack(dev
, dev
->mtu
);
378 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
379 pgr
->grec_type
= type
;
380 pgr
->grec_auxwords
= 0;
382 pgr
->grec_mca
= pmc
->multiaddr
;
383 pih
= igmpv3_report_hdr(skb
);
384 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
389 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
390 skb_tailroom(skb)) : 0)
392 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
393 int type
, int gdeleted
, int sdeleted
)
395 struct net_device
*dev
= pmc
->interface
->dev
;
396 struct igmpv3_report
*pih
;
397 struct igmpv3_grec
*pgr
= NULL
;
398 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
399 int scount
, stotal
, first
, isquery
, truncate
;
401 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
404 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
405 type
== IGMPV3_MODE_IS_EXCLUDE
;
406 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
407 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
411 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
416 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
418 /* EX and TO_EX get a fresh packet, if needed */
420 if (pih
&& pih
->ngrec
&&
421 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
423 igmpv3_sendpack(skb
);
424 skb
= igmpv3_newpack(dev
, dev
->mtu
);
429 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
432 psf_next
= psf
->sf_next
;
434 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
439 /* clear marks on query responses */
443 if (AVAILABLE(skb
) < sizeof(__be32
) +
444 first
*sizeof(struct igmpv3_grec
)) {
445 if (truncate
&& !first
)
446 break; /* truncate these */
448 pgr
->grec_nsrcs
= htons(scount
);
450 igmpv3_sendpack(skb
);
451 skb
= igmpv3_newpack(dev
, dev
->mtu
);
456 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
461 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
462 *psrc
= psf
->sf_inaddr
;
464 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
465 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
467 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
469 psf_prev
->sf_next
= psf
->sf_next
;
471 *psf_list
= psf
->sf_next
;
481 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
482 type
== IGMPV3_BLOCK_OLD_SOURCES
)
484 if (pmc
->crcount
|| isquery
) {
485 /* make sure we have room for group header */
486 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
487 igmpv3_sendpack(skb
);
488 skb
= NULL
; /* add_grhead will get a new one */
490 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
494 pgr
->grec_nsrcs
= htons(scount
);
497 pmc
->gsquery
= 0; /* clear query state on report */
501 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
503 struct sk_buff
*skb
= NULL
;
507 read_lock(&in_dev
->mc_list_lock
);
508 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
509 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
511 spin_lock_bh(&pmc
->lock
);
512 if (pmc
->sfcount
[MCAST_EXCLUDE
])
513 type
= IGMPV3_MODE_IS_EXCLUDE
;
515 type
= IGMPV3_MODE_IS_INCLUDE
;
516 skb
= add_grec(skb
, pmc
, type
, 0, 0);
517 spin_unlock_bh(&pmc
->lock
);
519 read_unlock(&in_dev
->mc_list_lock
);
521 spin_lock_bh(&pmc
->lock
);
522 if (pmc
->sfcount
[MCAST_EXCLUDE
])
523 type
= IGMPV3_MODE_IS_EXCLUDE
;
525 type
= IGMPV3_MODE_IS_INCLUDE
;
526 skb
= add_grec(skb
, pmc
, type
, 0, 0);
527 spin_unlock_bh(&pmc
->lock
);
531 return igmpv3_sendpack(skb
);
535 * remove zero-count source records from a source filter list
537 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
539 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
542 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
543 psf_next
= psf
->sf_next
;
544 if (psf
->sf_crcount
== 0) {
546 psf_prev
->sf_next
= psf
->sf_next
;
548 *ppsf
= psf
->sf_next
;
555 static void igmpv3_send_cr(struct in_device
*in_dev
)
557 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
558 struct sk_buff
*skb
= NULL
;
561 read_lock(&in_dev
->mc_list_lock
);
562 spin_lock_bh(&in_dev
->mc_tomb_lock
);
566 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
567 pmc_next
= pmc
->next
;
568 if (pmc
->sfmode
== MCAST_INCLUDE
) {
569 type
= IGMPV3_BLOCK_OLD_SOURCES
;
570 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
571 skb
= add_grec(skb
, pmc
, type
, 1, 0);
572 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
575 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
576 type
= IGMPV3_CHANGE_TO_INCLUDE
;
577 skb
= add_grec(skb
, pmc
, type
, 1, 0);
580 if (pmc
->crcount
== 0) {
581 igmpv3_clear_zeros(&pmc
->tomb
);
582 igmpv3_clear_zeros(&pmc
->sources
);
585 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
587 pmc_prev
->next
= pmc_next
;
589 in_dev
->mc_tomb
= pmc_next
;
590 in_dev_put(pmc
->interface
);
595 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
598 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
599 spin_lock_bh(&pmc
->lock
);
600 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
601 type
= IGMPV3_BLOCK_OLD_SOURCES
;
602 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
604 type
= IGMPV3_ALLOW_NEW_SOURCES
;
605 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
607 skb
= add_grec(skb
, pmc
, type
, 0, 0);
608 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
610 /* filter mode changes */
612 if (pmc
->sfmode
== MCAST_EXCLUDE
)
613 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
615 type
= IGMPV3_CHANGE_TO_INCLUDE
;
616 skb
= add_grec(skb
, pmc
, type
, 0, 0);
619 spin_unlock_bh(&pmc
->lock
);
621 read_unlock(&in_dev
->mc_list_lock
);
625 (void) igmpv3_sendpack(skb
);
628 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
635 struct net_device
*dev
= in_dev
->dev
;
636 __be32 group
= pmc
? pmc
->multiaddr
: 0;
639 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
640 return igmpv3_send_report(in_dev
, pmc
);
641 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
642 dst
= IGMP_ALL_ROUTER
;
647 struct flowi fl
= { .oif
= dev
->ifindex
,
648 .nl_u
= { .ip4_u
= { .daddr
= dst
} },
649 .proto
= IPPROTO_IGMP
};
650 if (ip_route_output_key(&rt
, &fl
))
653 if (rt
->rt_src
== 0) {
658 skb
=alloc_skb(IGMP_SIZE
+LL_RESERVED_SPACE(dev
), GFP_ATOMIC
);
664 skb
->dst
= &rt
->u
.dst
;
666 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
668 skb_reset_network_header(skb
);
670 skb_put(skb
, sizeof(struct iphdr
) + 4);
673 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
675 iph
->frag_off
= htons(IP_DF
);
678 iph
->saddr
= rt
->rt_src
;
679 iph
->protocol
= IPPROTO_IGMP
;
680 iph
->tot_len
= htons(IGMP_SIZE
);
681 ip_select_ident(iph
, &rt
->u
.dst
, NULL
);
682 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
683 ((u8
*)&iph
[1])[1] = 4;
684 ((u8
*)&iph
[1])[2] = 0;
685 ((u8
*)&iph
[1])[3] = 0;
688 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
693 ih
->csum
=ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
695 return NF_HOOK(PF_INET
, NF_IP_LOCAL_OUT
, skb
, NULL
, rt
->u
.dst
.dev
,
699 static void igmp_gq_timer_expire(unsigned long data
)
701 struct in_device
*in_dev
= (struct in_device
*)data
;
703 in_dev
->mr_gq_running
= 0;
704 igmpv3_send_report(in_dev
, NULL
);
705 __in_dev_put(in_dev
);
708 static void igmp_ifc_timer_expire(unsigned long data
)
710 struct in_device
*in_dev
= (struct in_device
*)data
;
712 igmpv3_send_cr(in_dev
);
713 if (in_dev
->mr_ifc_count
) {
714 in_dev
->mr_ifc_count
--;
715 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
717 __in_dev_put(in_dev
);
720 static void igmp_ifc_event(struct in_device
*in_dev
)
722 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
724 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
725 IGMP_Unsolicited_Report_Count
;
726 igmp_ifc_start_timer(in_dev
, 1);
730 static void igmp_timer_expire(unsigned long data
)
732 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
733 struct in_device
*in_dev
= im
->interface
;
735 spin_lock(&im
->lock
);
738 if (im
->unsolicit_count
) {
739 im
->unsolicit_count
--;
740 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
743 spin_unlock(&im
->lock
);
745 if (IGMP_V1_SEEN(in_dev
))
746 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
747 else if (IGMP_V2_SEEN(in_dev
))
748 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
750 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
755 /* mark EXCLUDE-mode sources */
756 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
758 struct ip_sf_list
*psf
;
762 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
765 for (i
=0; i
<nsrcs
; i
++) {
766 /* skip inactive filters */
767 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
768 pmc
->sfcount
[MCAST_EXCLUDE
] !=
769 psf
->sf_count
[MCAST_EXCLUDE
])
771 if (srcs
[i
] == psf
->sf_inaddr
) {
778 if (scount
== nsrcs
) /* all sources excluded */
783 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
785 struct ip_sf_list
*psf
;
788 if (pmc
->sfmode
== MCAST_EXCLUDE
)
789 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
791 /* mark INCLUDE-mode sources */
793 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
796 for (i
=0; i
<nsrcs
; i
++)
797 if (srcs
[i
] == psf
->sf_inaddr
) {
811 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
813 struct ip_mc_list
*im
;
815 /* Timers are only set for non-local groups */
817 if (group
== IGMP_ALL_HOSTS
)
820 read_lock(&in_dev
->mc_list_lock
);
821 for (im
=in_dev
->mc_list
; im
!=NULL
; im
=im
->next
) {
822 if (im
->multiaddr
== group
) {
827 read_unlock(&in_dev
->mc_list_lock
);
830 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
833 struct igmphdr
*ih
= igmp_hdr(skb
);
834 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
835 struct ip_mc_list
*im
;
836 __be32 group
= ih
->group
;
843 /* Alas, old v1 router presents here. */
845 max_delay
= IGMP_Query_Response_Interval
;
846 in_dev
->mr_v1_seen
= jiffies
+
847 IGMP_V1_Router_Present_Timeout
;
850 /* v2 router present */
851 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
852 in_dev
->mr_v2_seen
= jiffies
+
853 IGMP_V2_Router_Present_Timeout
;
855 /* cancel the interface change timer */
856 in_dev
->mr_ifc_count
= 0;
857 if (del_timer(&in_dev
->mr_ifc_timer
))
858 __in_dev_put(in_dev
);
859 /* clear deleted report items */
860 igmpv3_clear_delrec(in_dev
);
861 } else if (len
< 12) {
862 return; /* ignore bogus packet; freed by caller */
864 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
867 ih3
= igmpv3_query_hdr(skb
);
869 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
870 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
872 ih3
= igmpv3_query_hdr(skb
);
875 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
877 max_delay
= 1; /* can't mod w/ 0 */
878 in_dev
->mr_maxdelay
= max_delay
;
880 in_dev
->mr_qrv
= ih3
->qrv
;
881 if (!group
) { /* general query */
883 return; /* no sources allowed */
884 igmp_gq_start_timer(in_dev
);
887 /* mark sources to include, if group & source-specific */
888 mark
= ih3
->nsrcs
!= 0;
892 * - Start the timers in all of our membership records
893 * that the query applies to for the interface on
894 * which the query arrived excl. those that belong
895 * to a "local" group (224.0.0.X)
896 * - For timers already running check if they need to
898 * - Use the igmp->igmp_code field as the maximum
901 read_lock(&in_dev
->mc_list_lock
);
902 for (im
=in_dev
->mc_list
; im
!=NULL
; im
=im
->next
) {
905 if (group
&& group
!= im
->multiaddr
)
907 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
909 spin_lock_bh(&im
->lock
);
911 im
->gsquery
= im
->gsquery
&& mark
;
914 changed
= !im
->gsquery
||
915 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
916 spin_unlock_bh(&im
->lock
);
918 igmp_mod_timer(im
, max_delay
);
920 read_unlock(&in_dev
->mc_list_lock
);
923 int igmp_rcv(struct sk_buff
*skb
)
925 /* This basically follows the spec line by line -- see RFC1112 */
927 struct in_device
*in_dev
= in_dev_get(skb
->dev
);
935 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
938 switch (skb
->ip_summed
) {
939 case CHECKSUM_COMPLETE
:
940 if (!csum_fold(skb
->csum
))
945 if (__skb_checksum_complete(skb
))
951 case IGMP_HOST_MEMBERSHIP_QUERY
:
952 igmp_heard_query(in_dev
, skb
, len
);
954 case IGMP_HOST_MEMBERSHIP_REPORT
:
955 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
956 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
957 /* Is it our report looped back? */
958 if (((struct rtable
*)skb
->dst
)->fl
.iif
== 0)
960 /* don't rely on MC router hearing unicast reports */
961 if (skb
->pkt_type
== PACKET_MULTICAST
||
962 skb
->pkt_type
== PACKET_BROADCAST
)
963 igmp_heard_report(in_dev
, ih
->group
);
966 #ifdef CONFIG_IP_PIMSM_V1
968 return pim_rcv_v1(skb
);
972 case IGMP_HOST_LEAVE_MESSAGE
:
974 case IGMP_MTRACE_RESP
:
990 * Add a filter to a device
993 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
995 char buf
[MAX_ADDR_LEN
];
996 struct net_device
*dev
= in_dev
->dev
;
998 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
999 We will get multicast token leakage, when IFF_MULTICAST
1000 is changed. This check should be done in dev->set_multicast_list
1001 routine. Something sort of:
1002 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1005 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1006 dev_mc_add(dev
,buf
,dev
->addr_len
,0);
1010 * Remove a filter from a device
1013 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1015 char buf
[MAX_ADDR_LEN
];
1016 struct net_device
*dev
= in_dev
->dev
;
1018 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1019 dev_mc_delete(dev
,buf
,dev
->addr_len
,0);
1022 #ifdef CONFIG_IP_MULTICAST
1024 * deleted ip_mc_list manipulation
1026 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1028 struct ip_mc_list
*pmc
;
1030 /* this is an "ip_mc_list" for convenience; only the fields below
1031 * are actually used. In particular, the refcnt and users are not
1032 * used for management of the delete list. Using the same structure
1033 * for deleted items allows change reports to use common code with
1034 * non-deleted or query-response MCA's.
1036 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1039 spin_lock_bh(&im
->lock
);
1040 pmc
->interface
= im
->interface
;
1041 in_dev_hold(in_dev
);
1042 pmc
->multiaddr
= im
->multiaddr
;
1043 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1044 IGMP_Unsolicited_Report_Count
;
1045 pmc
->sfmode
= im
->sfmode
;
1046 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1047 struct ip_sf_list
*psf
;
1049 pmc
->tomb
= im
->tomb
;
1050 pmc
->sources
= im
->sources
;
1051 im
->tomb
= im
->sources
= NULL
;
1052 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1053 psf
->sf_crcount
= pmc
->crcount
;
1055 spin_unlock_bh(&im
->lock
);
1057 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1058 pmc
->next
= in_dev
->mc_tomb
;
1059 in_dev
->mc_tomb
= pmc
;
1060 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1063 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1065 struct ip_mc_list
*pmc
, *pmc_prev
;
1066 struct ip_sf_list
*psf
, *psf_next
;
1068 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1070 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1071 if (pmc
->multiaddr
== multiaddr
)
1077 pmc_prev
->next
= pmc
->next
;
1079 in_dev
->mc_tomb
= pmc
->next
;
1081 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1083 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1084 psf_next
= psf
->sf_next
;
1087 in_dev_put(pmc
->interface
);
1092 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1094 struct ip_mc_list
*pmc
, *nextpmc
;
1096 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1097 pmc
= in_dev
->mc_tomb
;
1098 in_dev
->mc_tomb
= NULL
;
1099 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1101 for (; pmc
; pmc
= nextpmc
) {
1102 nextpmc
= pmc
->next
;
1103 ip_mc_clear_src(pmc
);
1104 in_dev_put(pmc
->interface
);
1107 /* clear dead sources, too */
1108 read_lock(&in_dev
->mc_list_lock
);
1109 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
1110 struct ip_sf_list
*psf
, *psf_next
;
1112 spin_lock_bh(&pmc
->lock
);
1115 spin_unlock_bh(&pmc
->lock
);
1116 for (; psf
; psf
=psf_next
) {
1117 psf_next
= psf
->sf_next
;
1121 read_unlock(&in_dev
->mc_list_lock
);
1125 static void igmp_group_dropped(struct ip_mc_list
*im
)
1127 struct in_device
*in_dev
= im
->interface
;
1128 #ifdef CONFIG_IP_MULTICAST
1134 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1137 #ifdef CONFIG_IP_MULTICAST
1138 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1141 reporter
= im
->reporter
;
1142 igmp_stop_timer(im
);
1144 if (!in_dev
->dead
) {
1145 if (IGMP_V1_SEEN(in_dev
))
1147 if (IGMP_V2_SEEN(in_dev
)) {
1149 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1153 igmpv3_add_delrec(in_dev
, im
);
1155 igmp_ifc_event(in_dev
);
1159 ip_mc_clear_src(im
);
1162 static void igmp_group_added(struct ip_mc_list
*im
)
1164 struct in_device
*in_dev
= im
->interface
;
1166 if (im
->loaded
== 0) {
1168 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1171 #ifdef CONFIG_IP_MULTICAST
1172 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1177 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1178 spin_lock_bh(&im
->lock
);
1179 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1180 spin_unlock_bh(&im
->lock
);
1185 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1186 IGMP_Unsolicited_Report_Count
;
1187 igmp_ifc_event(in_dev
);
1193 * Multicast list managers
1198 * A socket has joined a multicast group on device dev.
1201 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1203 struct ip_mc_list
*im
;
1207 for (im
=in_dev
->mc_list
; im
; im
=im
->next
) {
1208 if (im
->multiaddr
== addr
) {
1210 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1215 im
= kmalloc(sizeof(*im
), GFP_KERNEL
);
1220 im
->interface
=in_dev
;
1221 in_dev_hold(in_dev
);
1223 /* initial mode is (EX, empty) */
1224 im
->sfmode
= MCAST_EXCLUDE
;
1225 im
->sfcount
[MCAST_INCLUDE
] = 0;
1226 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1230 atomic_set(&im
->refcnt
, 1);
1231 spin_lock_init(&im
->lock
);
1232 #ifdef CONFIG_IP_MULTICAST
1234 init_timer(&im
->timer
);
1235 im
->timer
.data
=(unsigned long)im
;
1236 im
->timer
.function
=&igmp_timer_expire
;
1237 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1242 write_lock_bh(&in_dev
->mc_list_lock
);
1243 im
->next
=in_dev
->mc_list
;
1245 write_unlock_bh(&in_dev
->mc_list_lock
);
1246 #ifdef CONFIG_IP_MULTICAST
1247 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1249 igmp_group_added(im
);
1251 ip_rt_multicast_event(in_dev
);
1257 * Resend IGMP JOIN report; used for bonding.
1259 void ip_mc_rejoin_group(struct ip_mc_list
*im
)
1261 #ifdef CONFIG_IP_MULTICAST
1262 struct in_device
*in_dev
= im
->interface
;
1264 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1267 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1268 igmp_mod_timer(im
, IGMP_Initial_Report_Delay
);
1272 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1273 IGMP_Unsolicited_Report_Count
;
1274 igmp_ifc_event(in_dev
);
1279 * A socket has left a multicast group on device dev
1282 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1284 struct ip_mc_list
*i
, **ip
;
1288 for (ip
=&in_dev
->mc_list
; (i
=*ip
)!=NULL
; ip
=&i
->next
) {
1289 if (i
->multiaddr
==addr
) {
1290 if (--i
->users
== 0) {
1291 write_lock_bh(&in_dev
->mc_list_lock
);
1293 write_unlock_bh(&in_dev
->mc_list_lock
);
1294 igmp_group_dropped(i
);
1297 ip_rt_multicast_event(in_dev
);
1307 /* Device going down */
1309 void ip_mc_down(struct in_device
*in_dev
)
1311 struct ip_mc_list
*i
;
1315 for (i
=in_dev
->mc_list
; i
; i
=i
->next
)
1316 igmp_group_dropped(i
);
1318 #ifdef CONFIG_IP_MULTICAST
1319 in_dev
->mr_ifc_count
= 0;
1320 if (del_timer(&in_dev
->mr_ifc_timer
))
1321 __in_dev_put(in_dev
);
1322 in_dev
->mr_gq_running
= 0;
1323 if (del_timer(&in_dev
->mr_gq_timer
))
1324 __in_dev_put(in_dev
);
1325 igmpv3_clear_delrec(in_dev
);
1328 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1331 void ip_mc_init_dev(struct in_device
*in_dev
)
1335 in_dev
->mc_tomb
= NULL
;
1336 #ifdef CONFIG_IP_MULTICAST
1337 in_dev
->mr_gq_running
= 0;
1338 init_timer(&in_dev
->mr_gq_timer
);
1339 in_dev
->mr_gq_timer
.data
=(unsigned long) in_dev
;
1340 in_dev
->mr_gq_timer
.function
=&igmp_gq_timer_expire
;
1341 in_dev
->mr_ifc_count
= 0;
1342 init_timer(&in_dev
->mr_ifc_timer
);
1343 in_dev
->mr_ifc_timer
.data
=(unsigned long) in_dev
;
1344 in_dev
->mr_ifc_timer
.function
=&igmp_ifc_timer_expire
;
1345 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1348 rwlock_init(&in_dev
->mc_list_lock
);
1349 spin_lock_init(&in_dev
->mc_tomb_lock
);
1352 /* Device going up */
1354 void ip_mc_up(struct in_device
*in_dev
)
1356 struct ip_mc_list
*i
;
1360 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1362 for (i
=in_dev
->mc_list
; i
; i
=i
->next
)
1363 igmp_group_added(i
);
1367 * Device is about to be destroyed: clean up.
1370 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1372 struct ip_mc_list
*i
;
1376 /* Deactivate timers */
1379 write_lock_bh(&in_dev
->mc_list_lock
);
1380 while ((i
= in_dev
->mc_list
) != NULL
) {
1381 in_dev
->mc_list
= i
->next
;
1382 write_unlock_bh(&in_dev
->mc_list_lock
);
1384 igmp_group_dropped(i
);
1387 write_lock_bh(&in_dev
->mc_list_lock
);
1389 write_unlock_bh(&in_dev
->mc_list_lock
);
1392 static struct in_device
* ip_mc_find_dev(struct ip_mreqn
*imr
)
1394 struct flowi fl
= { .nl_u
= { .ip4_u
=
1395 { .daddr
= imr
->imr_multiaddr
.s_addr
} } };
1397 struct net_device
*dev
= NULL
;
1398 struct in_device
*idev
= NULL
;
1400 if (imr
->imr_ifindex
) {
1401 idev
= inetdev_by_index(imr
->imr_ifindex
);
1406 if (imr
->imr_address
.s_addr
) {
1407 dev
= ip_dev_find(imr
->imr_address
.s_addr
);
1413 if (!dev
&& !ip_route_output_key(&rt
, &fl
)) {
1414 dev
= rt
->u
.dst
.dev
;
1418 imr
->imr_ifindex
= dev
->ifindex
;
1419 idev
= __in_dev_get_rtnl(dev
);
1425 * Join a socket to a group
1427 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1428 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1431 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1434 struct ip_sf_list
*psf
, *psf_prev
;
1438 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1439 if (psf
->sf_inaddr
== *psfsrc
)
1443 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1444 /* source filter not found, or count wrong => bug */
1447 psf
->sf_count
[sfmode
]--;
1448 if (psf
->sf_count
[sfmode
] == 0) {
1449 ip_rt_multicast_event(pmc
->interface
);
1451 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1452 #ifdef CONFIG_IP_MULTICAST
1453 struct in_device
*in_dev
= pmc
->interface
;
1456 /* no more filters for this source */
1458 psf_prev
->sf_next
= psf
->sf_next
;
1460 pmc
->sources
= psf
->sf_next
;
1461 #ifdef CONFIG_IP_MULTICAST
1462 if (psf
->sf_oldin
&&
1463 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1464 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1465 IGMP_Unsolicited_Report_Count
;
1466 psf
->sf_next
= pmc
->tomb
;
1476 #ifndef CONFIG_IP_MULTICAST
1477 #define igmp_ifc_event(x) do { } while (0)
1480 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1481 int sfcount
, __be32
*psfsrc
, int delta
)
1483 struct ip_mc_list
*pmc
;
1489 read_lock(&in_dev
->mc_list_lock
);
1490 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
1491 if (*pmca
== pmc
->multiaddr
)
1495 /* MCA not found?? bug */
1496 read_unlock(&in_dev
->mc_list_lock
);
1499 spin_lock_bh(&pmc
->lock
);
1500 read_unlock(&in_dev
->mc_list_lock
);
1501 #ifdef CONFIG_IP_MULTICAST
1506 if (!pmc
->sfcount
[sfmode
])
1508 pmc
->sfcount
[sfmode
]--;
1511 for (i
=0; i
<sfcount
; i
++) {
1512 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1514 changerec
|= rv
> 0;
1518 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1519 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1520 pmc
->sfcount
[MCAST_INCLUDE
]) {
1521 #ifdef CONFIG_IP_MULTICAST
1522 struct ip_sf_list
*psf
;
1525 /* filter mode change */
1526 pmc
->sfmode
= MCAST_INCLUDE
;
1527 #ifdef CONFIG_IP_MULTICAST
1528 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1529 IGMP_Unsolicited_Report_Count
;
1530 in_dev
->mr_ifc_count
= pmc
->crcount
;
1531 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1532 psf
->sf_crcount
= 0;
1533 igmp_ifc_event(pmc
->interface
);
1534 } else if (sf_setstate(pmc
) || changerec
) {
1535 igmp_ifc_event(pmc
->interface
);
1539 spin_unlock_bh(&pmc
->lock
);
1544 * Add multicast single-source filter to the interface list
1546 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1547 __be32
*psfsrc
, int delta
)
1549 struct ip_sf_list
*psf
, *psf_prev
;
1552 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1553 if (psf
->sf_inaddr
== *psfsrc
)
1558 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1561 psf
->sf_inaddr
= *psfsrc
;
1563 psf_prev
->sf_next
= psf
;
1567 psf
->sf_count
[sfmode
]++;
1568 if (psf
->sf_count
[sfmode
] == 1) {
1569 ip_rt_multicast_event(pmc
->interface
);
1574 #ifdef CONFIG_IP_MULTICAST
1575 static void sf_markstate(struct ip_mc_list
*pmc
)
1577 struct ip_sf_list
*psf
;
1578 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1580 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1581 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1582 psf
->sf_oldin
= mca_xcount
==
1583 psf
->sf_count
[MCAST_EXCLUDE
] &&
1584 !psf
->sf_count
[MCAST_INCLUDE
];
1586 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1589 static int sf_setstate(struct ip_mc_list
*pmc
)
1591 struct ip_sf_list
*psf
, *dpsf
;
1592 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1593 int qrv
= pmc
->interface
->mr_qrv
;
1597 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1598 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1599 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1600 !psf
->sf_count
[MCAST_INCLUDE
];
1602 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1604 if (!psf
->sf_oldin
) {
1605 struct ip_sf_list
*prev
= NULL
;
1607 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1608 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1614 prev
->sf_next
= dpsf
->sf_next
;
1616 pmc
->tomb
= dpsf
->sf_next
;
1619 psf
->sf_crcount
= qrv
;
1622 } else if (psf
->sf_oldin
) {
1624 psf
->sf_crcount
= 0;
1626 * add or update "delete" records if an active filter
1629 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1630 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1633 dpsf
= (struct ip_sf_list
*)
1634 kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1638 /* pmc->lock held by callers */
1639 dpsf
->sf_next
= pmc
->tomb
;
1642 dpsf
->sf_crcount
= qrv
;
1651 * Add multicast source filter list to the interface list
1653 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1654 int sfcount
, __be32
*psfsrc
, int delta
)
1656 struct ip_mc_list
*pmc
;
1662 read_lock(&in_dev
->mc_list_lock
);
1663 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
1664 if (*pmca
== pmc
->multiaddr
)
1668 /* MCA not found?? bug */
1669 read_unlock(&in_dev
->mc_list_lock
);
1672 spin_lock_bh(&pmc
->lock
);
1673 read_unlock(&in_dev
->mc_list_lock
);
1675 #ifdef CONFIG_IP_MULTICAST
1678 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1680 pmc
->sfcount
[sfmode
]++;
1682 for (i
=0; i
<sfcount
; i
++) {
1683 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1690 pmc
->sfcount
[sfmode
]--;
1692 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1693 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1694 #ifdef CONFIG_IP_MULTICAST
1695 struct in_device
*in_dev
= pmc
->interface
;
1696 struct ip_sf_list
*psf
;
1699 /* filter mode change */
1700 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1701 pmc
->sfmode
= MCAST_EXCLUDE
;
1702 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1703 pmc
->sfmode
= MCAST_INCLUDE
;
1704 #ifdef CONFIG_IP_MULTICAST
1705 /* else no filters; keep old mode for reports */
1707 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1708 IGMP_Unsolicited_Report_Count
;
1709 in_dev
->mr_ifc_count
= pmc
->crcount
;
1710 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1711 psf
->sf_crcount
= 0;
1712 igmp_ifc_event(in_dev
);
1713 } else if (sf_setstate(pmc
)) {
1714 igmp_ifc_event(in_dev
);
1717 spin_unlock_bh(&pmc
->lock
);
1721 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1723 struct ip_sf_list
*psf
, *nextpsf
;
1725 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1726 nextpsf
= psf
->sf_next
;
1730 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1731 nextpsf
= psf
->sf_next
;
1734 pmc
->sources
= NULL
;
1735 pmc
->sfmode
= MCAST_EXCLUDE
;
1736 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1737 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1742 * Join a multicast group
1744 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1747 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1748 struct ip_mc_socklist
*iml
=NULL
, *i
;
1749 struct in_device
*in_dev
;
1750 struct inet_sock
*inet
= inet_sk(sk
);
1754 if (!MULTICAST(addr
))
1759 in_dev
= ip_mc_find_dev(imr
);
1768 ifindex
= imr
->imr_ifindex
;
1769 for (i
= inet
->mc_list
; i
; i
= i
->next
) {
1770 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1771 i
->multi
.imr_ifindex
== ifindex
)
1776 if (count
>= sysctl_igmp_max_memberships
)
1778 iml
= sock_kmalloc(sk
,sizeof(*iml
),GFP_KERNEL
);
1782 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1783 iml
->next
= inet
->mc_list
;
1785 iml
->sfmode
= MCAST_EXCLUDE
;
1786 inet
->mc_list
= iml
;
1787 ip_mc_inc_group(in_dev
, addr
);
1794 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1795 struct in_device
*in_dev
)
1799 if (iml
->sflist
== 0) {
1800 /* any-source empty exclude case */
1801 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1802 iml
->sfmode
, 0, NULL
, 0);
1804 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1805 iml
->sfmode
, iml
->sflist
->sl_count
,
1806 iml
->sflist
->sl_addr
, 0);
1807 sock_kfree_s(sk
, iml
->sflist
, IP_SFLSIZE(iml
->sflist
->sl_max
));
1813 * Ask a socket to leave a group.
1816 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1818 struct inet_sock
*inet
= inet_sk(sk
);
1819 struct ip_mc_socklist
*iml
, **imlp
;
1820 struct in_device
*in_dev
;
1821 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1823 int ret
= -EADDRNOTAVAIL
;
1826 in_dev
= ip_mc_find_dev(imr
);
1827 ifindex
= imr
->imr_ifindex
;
1828 for (imlp
= &inet
->mc_list
; (iml
= *imlp
) != NULL
; imlp
= &iml
->next
) {
1829 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1832 if (iml
->multi
.imr_ifindex
!= ifindex
)
1834 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1835 iml
->multi
.imr_address
.s_addr
)
1838 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1843 ip_mc_dec_group(in_dev
, group
);
1845 sock_kfree_s(sk
, iml
, sizeof(*iml
));
1854 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1855 ip_mreq_source
*mreqs
, int ifindex
)
1858 struct ip_mreqn imr
;
1859 __be32 addr
= mreqs
->imr_multiaddr
;
1860 struct ip_mc_socklist
*pmc
;
1861 struct in_device
*in_dev
= NULL
;
1862 struct inet_sock
*inet
= inet_sk(sk
);
1863 struct ip_sf_socklist
*psl
;
1867 if (!MULTICAST(addr
))
1872 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1873 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1874 imr
.imr_ifindex
= ifindex
;
1875 in_dev
= ip_mc_find_dev(&imr
);
1881 err
= -EADDRNOTAVAIL
;
1883 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
1884 if (pmc
->multi
.imr_multiaddr
.s_addr
== imr
.imr_multiaddr
.s_addr
1885 && pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
1888 if (!pmc
) { /* must have a prior join */
1892 /* if a source filter was set, must be the same mode as before */
1894 if (pmc
->sfmode
!= omode
) {
1898 } else if (pmc
->sfmode
!= omode
) {
1899 /* allow mode switches for empty-set filters */
1900 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1901 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1903 pmc
->sfmode
= omode
;
1909 goto done
; /* err = -EADDRNOTAVAIL */
1911 for (i
=0; i
<psl
->sl_count
; i
++) {
1912 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1917 if (rv
) /* source not found */
1918 goto done
; /* err = -EADDRNOTAVAIL */
1920 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1921 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1926 /* update the interface filter */
1927 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1928 &mreqs
->imr_sourceaddr
, 1);
1930 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1931 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1936 /* else, add a new source to the filter */
1938 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
1942 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
1943 struct ip_sf_socklist
*newpsl
;
1944 int count
= IP_SFBLOCK
;
1947 count
+= psl
->sl_max
;
1948 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
1953 newpsl
->sl_max
= count
;
1954 newpsl
->sl_count
= count
- IP_SFBLOCK
;
1956 for (i
=0; i
<psl
->sl_count
; i
++)
1957 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
1958 sock_kfree_s(sk
, psl
, IP_SFLSIZE(psl
->sl_max
));
1960 pmc
->sflist
= psl
= newpsl
;
1962 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
1963 for (i
=0; i
<psl
->sl_count
; i
++) {
1964 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1969 if (rv
== 0) /* address already there is an error */
1971 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
1972 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
1973 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
1976 /* update the interface list */
1977 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1978 &mreqs
->imr_sourceaddr
, 1);
1982 return ip_mc_leave_group(sk
, &imr
);
1986 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
1989 struct ip_mreqn imr
;
1990 __be32 addr
= msf
->imsf_multiaddr
;
1991 struct ip_mc_socklist
*pmc
;
1992 struct in_device
*in_dev
;
1993 struct inet_sock
*inet
= inet_sk(sk
);
1994 struct ip_sf_socklist
*newpsl
, *psl
;
1997 if (!MULTICAST(addr
))
1999 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2000 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2005 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2006 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2007 imr
.imr_ifindex
= ifindex
;
2008 in_dev
= ip_mc_find_dev(&imr
);
2015 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2016 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2021 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2022 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2023 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2026 if (!pmc
) { /* must have a prior join */
2030 if (msf
->imsf_numsrc
) {
2031 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2037 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2038 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2039 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2040 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2041 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2043 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2048 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2049 msf
->imsf_fmode
, 0, NULL
, 0);
2053 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2054 psl
->sl_count
, psl
->sl_addr
, 0);
2055 sock_kfree_s(sk
, psl
, IP_SFLSIZE(psl
->sl_max
));
2057 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2059 pmc
->sflist
= newpsl
;
2060 pmc
->sfmode
= msf
->imsf_fmode
;
2065 err
= ip_mc_leave_group(sk
, &imr
);
2069 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2070 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2072 int err
, len
, count
, copycount
;
2073 struct ip_mreqn imr
;
2074 __be32 addr
= msf
->imsf_multiaddr
;
2075 struct ip_mc_socklist
*pmc
;
2076 struct in_device
*in_dev
;
2077 struct inet_sock
*inet
= inet_sk(sk
);
2078 struct ip_sf_socklist
*psl
;
2080 if (!MULTICAST(addr
))
2085 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2086 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2087 imr
.imr_ifindex
= 0;
2088 in_dev
= ip_mc_find_dev(&imr
);
2094 err
= -EADDRNOTAVAIL
;
2096 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2097 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2098 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2101 if (!pmc
) /* must have a prior join */
2103 msf
->imsf_fmode
= pmc
->sfmode
;
2110 count
= psl
->sl_count
;
2112 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2113 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2114 msf
->imsf_numsrc
= count
;
2115 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2116 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2120 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2128 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2129 struct group_filter __user
*optval
, int __user
*optlen
)
2131 int err
, i
, count
, copycount
;
2132 struct sockaddr_in
*psin
;
2134 struct ip_mc_socklist
*pmc
;
2135 struct inet_sock
*inet
= inet_sk(sk
);
2136 struct ip_sf_socklist
*psl
;
2138 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2139 if (psin
->sin_family
!= AF_INET
)
2141 addr
= psin
->sin_addr
.s_addr
;
2142 if (!MULTICAST(addr
))
2147 err
= -EADDRNOTAVAIL
;
2149 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2150 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2151 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2154 if (!pmc
) /* must have a prior join */
2156 gsf
->gf_fmode
= pmc
->sfmode
;
2159 count
= psl
? psl
->sl_count
: 0;
2160 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2161 gsf
->gf_numsrc
= count
;
2162 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2163 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2166 for (i
=0; i
<copycount
; i
++) {
2167 struct sockaddr_in
*psin
;
2168 struct sockaddr_storage ss
;
2170 psin
= (struct sockaddr_in
*)&ss
;
2171 memset(&ss
, 0, sizeof(ss
));
2172 psin
->sin_family
= AF_INET
;
2173 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2174 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2184 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2186 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2188 struct inet_sock
*inet
= inet_sk(sk
);
2189 struct ip_mc_socklist
*pmc
;
2190 struct ip_sf_socklist
*psl
;
2193 if (!MULTICAST(loc_addr
))
2196 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2197 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2198 pmc
->multi
.imr_ifindex
== dif
)
2205 return pmc
->sfmode
== MCAST_EXCLUDE
;
2207 for (i
=0; i
<psl
->sl_count
; i
++) {
2208 if (psl
->sl_addr
[i
] == rmt_addr
)
2211 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2213 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2219 * A socket is closing.
2222 void ip_mc_drop_socket(struct sock
*sk
)
2224 struct inet_sock
*inet
= inet_sk(sk
);
2225 struct ip_mc_socklist
*iml
;
2227 if (inet
->mc_list
== NULL
)
2231 while ((iml
= inet
->mc_list
) != NULL
) {
2232 struct in_device
*in_dev
;
2233 inet
->mc_list
= iml
->next
;
2235 in_dev
= inetdev_by_index(iml
->multi
.imr_ifindex
);
2236 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2237 if (in_dev
!= NULL
) {
2238 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2241 sock_kfree_s(sk
, iml
, sizeof(*iml
));
2246 int ip_check_mc(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2248 struct ip_mc_list
*im
;
2249 struct ip_sf_list
*psf
;
2252 read_lock(&in_dev
->mc_list_lock
);
2253 for (im
=in_dev
->mc_list
; im
; im
=im
->next
) {
2254 if (im
->multiaddr
== mc_addr
)
2257 if (im
&& proto
== IPPROTO_IGMP
) {
2261 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2262 if (psf
->sf_inaddr
== src_addr
)
2266 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2267 psf
->sf_count
[MCAST_EXCLUDE
] !=
2268 im
->sfcount
[MCAST_EXCLUDE
];
2270 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2272 rv
= 1; /* unspecified source; tentatively allow */
2274 read_unlock(&in_dev
->mc_list_lock
);
2278 #if defined(CONFIG_PROC_FS)
2279 struct igmp_mc_iter_state
{
2280 struct net_device
*dev
;
2281 struct in_device
*in_dev
;
2284 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2286 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2288 struct ip_mc_list
*im
= NULL
;
2289 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2291 for (state
->dev
= dev_base
, state
->in_dev
= NULL
;
2293 state
->dev
= state
->dev
->next
) {
2294 struct in_device
*in_dev
;
2295 in_dev
= in_dev_get(state
->dev
);
2298 read_lock(&in_dev
->mc_list_lock
);
2299 im
= in_dev
->mc_list
;
2301 state
->in_dev
= in_dev
;
2304 read_unlock(&in_dev
->mc_list_lock
);
2310 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2312 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2315 if (likely(state
->in_dev
!= NULL
)) {
2316 read_unlock(&state
->in_dev
->mc_list_lock
);
2317 in_dev_put(state
->in_dev
);
2319 state
->dev
= state
->dev
->next
;
2321 state
->in_dev
= NULL
;
2324 state
->in_dev
= in_dev_get(state
->dev
);
2327 read_lock(&state
->in_dev
->mc_list_lock
);
2328 im
= state
->in_dev
->mc_list
;
2333 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2335 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2337 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2339 return pos
? NULL
: im
;
2342 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2344 read_lock(&dev_base_lock
);
2345 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2348 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2350 struct ip_mc_list
*im
;
2351 if (v
== SEQ_START_TOKEN
)
2352 im
= igmp_mc_get_first(seq
);
2354 im
= igmp_mc_get_next(seq
, v
);
2359 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2361 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2362 if (likely(state
->in_dev
!= NULL
)) {
2363 read_unlock(&state
->in_dev
->mc_list_lock
);
2364 in_dev_put(state
->in_dev
);
2365 state
->in_dev
= NULL
;
2368 read_unlock(&dev_base_lock
);
2371 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2373 if (v
== SEQ_START_TOKEN
)
2375 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2377 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2378 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2380 #ifdef CONFIG_IP_MULTICAST
2381 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2382 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2388 if (state
->in_dev
->mc_list
== im
) {
2389 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2390 state
->dev
->ifindex
, state
->dev
->name
, state
->dev
->mc_count
, querier
);
2394 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2395 im
->multiaddr
, im
->users
,
2396 im
->tm_running
, im
->tm_running
?
2397 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2403 static const struct seq_operations igmp_mc_seq_ops
= {
2404 .start
= igmp_mc_seq_start
,
2405 .next
= igmp_mc_seq_next
,
2406 .stop
= igmp_mc_seq_stop
,
2407 .show
= igmp_mc_seq_show
,
2410 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2412 struct seq_file
*seq
;
2414 struct igmp_mc_iter_state
*s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
2418 rc
= seq_open(file
, &igmp_mc_seq_ops
);
2422 seq
= file
->private_data
;
2431 static const struct file_operations igmp_mc_seq_fops
= {
2432 .owner
= THIS_MODULE
,
2433 .open
= igmp_mc_seq_open
,
2435 .llseek
= seq_lseek
,
2436 .release
= seq_release_private
,
2439 struct igmp_mcf_iter_state
{
2440 struct net_device
*dev
;
2441 struct in_device
*idev
;
2442 struct ip_mc_list
*im
;
2445 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2447 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2449 struct ip_sf_list
*psf
= NULL
;
2450 struct ip_mc_list
*im
= NULL
;
2451 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2453 for (state
->dev
= dev_base
, state
->idev
= NULL
, state
->im
= NULL
;
2455 state
->dev
= state
->dev
->next
) {
2456 struct in_device
*idev
;
2457 idev
= in_dev_get(state
->dev
);
2458 if (unlikely(idev
== NULL
))
2460 read_lock(&idev
->mc_list_lock
);
2462 if (likely(im
!= NULL
)) {
2463 spin_lock_bh(&im
->lock
);
2465 if (likely(psf
!= NULL
)) {
2470 spin_unlock_bh(&im
->lock
);
2472 read_unlock(&idev
->mc_list_lock
);
2478 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2480 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2484 spin_unlock_bh(&state
->im
->lock
);
2485 state
->im
= state
->im
->next
;
2486 while (!state
->im
) {
2487 if (likely(state
->idev
!= NULL
)) {
2488 read_unlock(&state
->idev
->mc_list_lock
);
2489 in_dev_put(state
->idev
);
2491 state
->dev
= state
->dev
->next
;
2496 state
->idev
= in_dev_get(state
->dev
);
2499 read_lock(&state
->idev
->mc_list_lock
);
2500 state
->im
= state
->idev
->mc_list
;
2504 spin_lock_bh(&state
->im
->lock
);
2505 psf
= state
->im
->sources
;
2511 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2513 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2515 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2517 return pos
? NULL
: psf
;
2520 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2522 read_lock(&dev_base_lock
);
2523 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2526 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2528 struct ip_sf_list
*psf
;
2529 if (v
== SEQ_START_TOKEN
)
2530 psf
= igmp_mcf_get_first(seq
);
2532 psf
= igmp_mcf_get_next(seq
, v
);
2537 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2539 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2540 if (likely(state
->im
!= NULL
)) {
2541 spin_unlock_bh(&state
->im
->lock
);
2544 if (likely(state
->idev
!= NULL
)) {
2545 read_unlock(&state
->idev
->mc_list_lock
);
2546 in_dev_put(state
->idev
);
2550 read_unlock(&dev_base_lock
);
2553 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2555 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2556 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2558 if (v
== SEQ_START_TOKEN
) {
2561 "%10s %10s %6s %6s\n", "Idx",
2563 "SRC", "INC", "EXC");
2567 "0x%08x %6lu %6lu\n",
2568 state
->dev
->ifindex
, state
->dev
->name
,
2569 ntohl(state
->im
->multiaddr
),
2570 ntohl(psf
->sf_inaddr
),
2571 psf
->sf_count
[MCAST_INCLUDE
],
2572 psf
->sf_count
[MCAST_EXCLUDE
]);
2577 static const struct seq_operations igmp_mcf_seq_ops
= {
2578 .start
= igmp_mcf_seq_start
,
2579 .next
= igmp_mcf_seq_next
,
2580 .stop
= igmp_mcf_seq_stop
,
2581 .show
= igmp_mcf_seq_show
,
2584 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2586 struct seq_file
*seq
;
2588 struct igmp_mcf_iter_state
*s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
2592 rc
= seq_open(file
, &igmp_mcf_seq_ops
);
2596 seq
= file
->private_data
;
2605 static const struct file_operations igmp_mcf_seq_fops
= {
2606 .owner
= THIS_MODULE
,
2607 .open
= igmp_mcf_seq_open
,
2609 .llseek
= seq_lseek
,
2610 .release
= seq_release_private
,
2613 int __init
igmp_mc_proc_init(void)
2615 proc_net_fops_create("igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2616 proc_net_fops_create("mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2621 EXPORT_SYMBOL(ip_mc_dec_group
);
2622 EXPORT_SYMBOL(ip_mc_inc_group
);
2623 EXPORT_SYMBOL(ip_mc_join_group
);
2624 EXPORT_SYMBOL(ip_mc_rejoin_group
);