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 #define for_each_pmc_rcu(in_dev, pmc) \
161 for (pmc = rcu_dereference(in_dev->mc_list); \
163 pmc = rcu_dereference(pmc->next_rcu))
165 #define for_each_pmc_rtnl(in_dev, pmc) \
166 for (pmc = rtnl_dereference(in_dev->mc_list); \
168 pmc = rtnl_dereference(pmc->next_rcu))
170 #ifdef CONFIG_IP_MULTICAST
176 static void igmp_stop_timer(struct ip_mc_list
*im
)
178 spin_lock_bh(&im
->lock
);
179 if (del_timer(&im
->timer
))
180 atomic_dec(&im
->refcnt
);
183 im
->unsolicit_count
= 0;
184 spin_unlock_bh(&im
->lock
);
187 /* It must be called with locked im->lock */
188 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
190 int tv
= net_random() % max_delay
;
193 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
194 atomic_inc(&im
->refcnt
);
197 static void igmp_gq_start_timer(struct in_device
*in_dev
)
199 int tv
= net_random() % in_dev
->mr_maxdelay
;
201 in_dev
->mr_gq_running
= 1;
202 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
206 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
208 int tv
= net_random() % delay
;
210 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
214 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
216 spin_lock_bh(&im
->lock
);
217 im
->unsolicit_count
= 0;
218 if (del_timer(&im
->timer
)) {
219 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
220 add_timer(&im
->timer
);
222 spin_unlock_bh(&im
->lock
);
225 atomic_dec(&im
->refcnt
);
227 igmp_start_timer(im
, max_delay
);
228 spin_unlock_bh(&im
->lock
);
233 * Send an IGMP report.
236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
239 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
240 int gdeleted
, int sdeleted
)
243 case IGMPV3_MODE_IS_INCLUDE
:
244 case IGMPV3_MODE_IS_EXCLUDE
:
245 if (gdeleted
|| sdeleted
)
247 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
248 if (pmc
->sfmode
== MCAST_INCLUDE
)
250 /* don't include if this source is excluded
253 if (psf
->sf_count
[MCAST_INCLUDE
])
254 return type
== IGMPV3_MODE_IS_INCLUDE
;
255 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
256 psf
->sf_count
[MCAST_EXCLUDE
];
259 case IGMPV3_CHANGE_TO_INCLUDE
:
260 if (gdeleted
|| sdeleted
)
262 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
263 case IGMPV3_CHANGE_TO_EXCLUDE
:
264 if (gdeleted
|| sdeleted
)
266 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
267 psf
->sf_count
[MCAST_INCLUDE
])
269 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
270 psf
->sf_count
[MCAST_EXCLUDE
];
271 case IGMPV3_ALLOW_NEW_SOURCES
:
272 if (gdeleted
|| !psf
->sf_crcount
)
274 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
275 case IGMPV3_BLOCK_OLD_SOURCES
:
276 if (pmc
->sfmode
== MCAST_INCLUDE
)
277 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
278 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
284 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
286 struct ip_sf_list
*psf
;
289 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
290 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
297 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
299 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
304 struct igmpv3_report
*pig
;
305 struct net
*net
= dev_net(dev
);
307 int hlen
= LL_RESERVED_SPACE(dev
);
308 int tlen
= dev
->needed_tailroom
;
311 skb
= alloc_skb(size
+ hlen
+ tlen
,
312 GFP_ATOMIC
| __GFP_NOWARN
);
319 igmp_skb_size(skb
) = size
;
321 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
323 IPPROTO_IGMP
, 0, dev
->ifindex
);
329 skb_dst_set(skb
, &rt
->dst
);
332 skb_reserve(skb
, hlen
);
334 skb_reset_network_header(skb
);
336 skb_put(skb
, sizeof(struct iphdr
) + 4);
339 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
341 pip
->frag_off
= htons(IP_DF
);
343 pip
->daddr
= fl4
.daddr
;
344 pip
->saddr
= fl4
.saddr
;
345 pip
->protocol
= IPPROTO_IGMP
;
346 pip
->tot_len
= 0; /* filled in later */
347 ip_select_ident(pip
, &rt
->dst
, NULL
);
348 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
349 ((u8
*)&pip
[1])[1] = 4;
350 ((u8
*)&pip
[1])[2] = 0;
351 ((u8
*)&pip
[1])[3] = 0;
353 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
354 skb_put(skb
, sizeof(*pig
));
355 pig
= igmpv3_report_hdr(skb
);
356 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
364 static int igmpv3_sendpack(struct sk_buff
*skb
)
366 struct igmphdr
*pig
= igmp_hdr(skb
);
367 const int igmplen
= skb
->tail
- skb
->transport_header
;
369 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
371 return ip_local_out(skb
);
374 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
376 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
379 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
380 int type
, struct igmpv3_grec
**ppgr
)
382 struct net_device
*dev
= pmc
->interface
->dev
;
383 struct igmpv3_report
*pih
;
384 struct igmpv3_grec
*pgr
;
387 skb
= igmpv3_newpack(dev
, dev
->mtu
);
390 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
391 pgr
->grec_type
= type
;
392 pgr
->grec_auxwords
= 0;
394 pgr
->grec_mca
= pmc
->multiaddr
;
395 pih
= igmpv3_report_hdr(skb
);
396 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
401 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
402 skb_tailroom(skb)) : 0)
404 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
405 int type
, int gdeleted
, int sdeleted
)
407 struct net_device
*dev
= pmc
->interface
->dev
;
408 struct igmpv3_report
*pih
;
409 struct igmpv3_grec
*pgr
= NULL
;
410 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
411 int scount
, stotal
, first
, isquery
, truncate
;
413 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
416 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
417 type
== IGMPV3_MODE_IS_EXCLUDE
;
418 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
419 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
423 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
428 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
430 /* EX and TO_EX get a fresh packet, if needed */
432 if (pih
&& pih
->ngrec
&&
433 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
435 igmpv3_sendpack(skb
);
436 skb
= igmpv3_newpack(dev
, dev
->mtu
);
441 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
444 psf_next
= psf
->sf_next
;
446 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
451 /* clear marks on query responses */
455 if (AVAILABLE(skb
) < sizeof(__be32
) +
456 first
*sizeof(struct igmpv3_grec
)) {
457 if (truncate
&& !first
)
458 break; /* truncate these */
460 pgr
->grec_nsrcs
= htons(scount
);
462 igmpv3_sendpack(skb
);
463 skb
= igmpv3_newpack(dev
, dev
->mtu
);
468 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
473 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
474 *psrc
= psf
->sf_inaddr
;
476 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
477 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
479 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
481 psf_prev
->sf_next
= psf
->sf_next
;
483 *psf_list
= psf
->sf_next
;
493 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
494 type
== IGMPV3_BLOCK_OLD_SOURCES
)
496 if (pmc
->crcount
|| isquery
) {
497 /* make sure we have room for group header */
498 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
499 igmpv3_sendpack(skb
);
500 skb
= NULL
; /* add_grhead will get a new one */
502 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
506 pgr
->grec_nsrcs
= htons(scount
);
509 pmc
->gsquery
= 0; /* clear query state on report */
513 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
515 struct sk_buff
*skb
= NULL
;
520 for_each_pmc_rcu(in_dev
, pmc
) {
521 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
523 spin_lock_bh(&pmc
->lock
);
524 if (pmc
->sfcount
[MCAST_EXCLUDE
])
525 type
= IGMPV3_MODE_IS_EXCLUDE
;
527 type
= IGMPV3_MODE_IS_INCLUDE
;
528 skb
= add_grec(skb
, pmc
, type
, 0, 0);
529 spin_unlock_bh(&pmc
->lock
);
533 spin_lock_bh(&pmc
->lock
);
534 if (pmc
->sfcount
[MCAST_EXCLUDE
])
535 type
= IGMPV3_MODE_IS_EXCLUDE
;
537 type
= IGMPV3_MODE_IS_INCLUDE
;
538 skb
= add_grec(skb
, pmc
, type
, 0, 0);
539 spin_unlock_bh(&pmc
->lock
);
543 return igmpv3_sendpack(skb
);
547 * remove zero-count source records from a source filter list
549 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
551 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
554 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
555 psf_next
= psf
->sf_next
;
556 if (psf
->sf_crcount
== 0) {
558 psf_prev
->sf_next
= psf
->sf_next
;
560 *ppsf
= psf
->sf_next
;
567 static void igmpv3_send_cr(struct in_device
*in_dev
)
569 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
570 struct sk_buff
*skb
= NULL
;
574 spin_lock_bh(&in_dev
->mc_tomb_lock
);
578 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
579 pmc_next
= pmc
->next
;
580 if (pmc
->sfmode
== MCAST_INCLUDE
) {
581 type
= IGMPV3_BLOCK_OLD_SOURCES
;
582 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
583 skb
= add_grec(skb
, pmc
, type
, 1, 0);
584 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
587 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
588 type
= IGMPV3_CHANGE_TO_INCLUDE
;
589 skb
= add_grec(skb
, pmc
, type
, 1, 0);
592 if (pmc
->crcount
== 0) {
593 igmpv3_clear_zeros(&pmc
->tomb
);
594 igmpv3_clear_zeros(&pmc
->sources
);
597 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
599 pmc_prev
->next
= pmc_next
;
601 in_dev
->mc_tomb
= pmc_next
;
602 in_dev_put(pmc
->interface
);
607 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
610 for_each_pmc_rcu(in_dev
, pmc
) {
611 spin_lock_bh(&pmc
->lock
);
612 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
613 type
= IGMPV3_BLOCK_OLD_SOURCES
;
614 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
616 type
= IGMPV3_ALLOW_NEW_SOURCES
;
617 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
619 skb
= add_grec(skb
, pmc
, type
, 0, 0);
620 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
622 /* filter mode changes */
624 if (pmc
->sfmode
== MCAST_EXCLUDE
)
625 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
627 type
= IGMPV3_CHANGE_TO_INCLUDE
;
628 skb
= add_grec(skb
, pmc
, type
, 0, 0);
631 spin_unlock_bh(&pmc
->lock
);
637 (void) igmpv3_sendpack(skb
);
640 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
647 struct net_device
*dev
= in_dev
->dev
;
648 struct net
*net
= dev_net(dev
);
649 __be32 group
= pmc
? pmc
->multiaddr
: 0;
654 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
655 return igmpv3_send_report(in_dev
, pmc
);
656 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
657 dst
= IGMP_ALL_ROUTER
;
661 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
663 IPPROTO_IGMP
, 0, dev
->ifindex
);
667 hlen
= LL_RESERVED_SPACE(dev
);
668 tlen
= dev
->needed_tailroom
;
669 skb
= alloc_skb(IGMP_SIZE
+ hlen
+ tlen
, GFP_ATOMIC
);
675 skb_dst_set(skb
, &rt
->dst
);
677 skb_reserve(skb
, hlen
);
679 skb_reset_network_header(skb
);
681 skb_put(skb
, sizeof(struct iphdr
) + 4);
684 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
686 iph
->frag_off
= htons(IP_DF
);
689 iph
->saddr
= fl4
.saddr
;
690 iph
->protocol
= IPPROTO_IGMP
;
691 ip_select_ident(iph
, &rt
->dst
, NULL
);
692 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
693 ((u8
*)&iph
[1])[1] = 4;
694 ((u8
*)&iph
[1])[2] = 0;
695 ((u8
*)&iph
[1])[3] = 0;
697 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
702 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
704 return ip_local_out(skb
);
707 static void igmp_gq_timer_expire(unsigned long data
)
709 struct in_device
*in_dev
= (struct in_device
*)data
;
711 in_dev
->mr_gq_running
= 0;
712 igmpv3_send_report(in_dev
, NULL
);
713 __in_dev_put(in_dev
);
716 static void igmp_ifc_timer_expire(unsigned long data
)
718 struct in_device
*in_dev
= (struct in_device
*)data
;
720 igmpv3_send_cr(in_dev
);
721 if (in_dev
->mr_ifc_count
) {
722 in_dev
->mr_ifc_count
--;
723 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
725 __in_dev_put(in_dev
);
728 static void igmp_ifc_event(struct in_device
*in_dev
)
730 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
732 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
733 IGMP_Unsolicited_Report_Count
;
734 igmp_ifc_start_timer(in_dev
, 1);
738 static void igmp_timer_expire(unsigned long data
)
740 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
741 struct in_device
*in_dev
= im
->interface
;
743 spin_lock(&im
->lock
);
746 if (im
->unsolicit_count
) {
747 im
->unsolicit_count
--;
748 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
751 spin_unlock(&im
->lock
);
753 if (IGMP_V1_SEEN(in_dev
))
754 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
755 else if (IGMP_V2_SEEN(in_dev
))
756 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
758 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
763 /* mark EXCLUDE-mode sources */
764 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
766 struct ip_sf_list
*psf
;
770 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
773 for (i
=0; i
<nsrcs
; i
++) {
774 /* skip inactive filters */
775 if (psf
->sf_count
[MCAST_INCLUDE
] ||
776 pmc
->sfcount
[MCAST_EXCLUDE
] !=
777 psf
->sf_count
[MCAST_EXCLUDE
])
779 if (srcs
[i
] == psf
->sf_inaddr
) {
786 if (scount
== nsrcs
) /* all sources excluded */
791 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
793 struct ip_sf_list
*psf
;
796 if (pmc
->sfmode
== MCAST_EXCLUDE
)
797 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
799 /* mark INCLUDE-mode sources */
801 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
804 for (i
=0; i
<nsrcs
; i
++)
805 if (srcs
[i
] == psf
->sf_inaddr
) {
819 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
821 struct ip_mc_list
*im
;
823 /* Timers are only set for non-local groups */
825 if (group
== IGMP_ALL_HOSTS
)
829 for_each_pmc_rcu(in_dev
, im
) {
830 if (im
->multiaddr
== group
) {
838 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
841 struct igmphdr
*ih
= igmp_hdr(skb
);
842 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
843 struct ip_mc_list
*im
;
844 __be32 group
= ih
->group
;
851 /* Alas, old v1 router presents here. */
853 max_delay
= IGMP_Query_Response_Interval
;
854 in_dev
->mr_v1_seen
= jiffies
+
855 IGMP_V1_Router_Present_Timeout
;
858 /* v2 router present */
859 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
860 in_dev
->mr_v2_seen
= jiffies
+
861 IGMP_V2_Router_Present_Timeout
;
863 /* cancel the interface change timer */
864 in_dev
->mr_ifc_count
= 0;
865 if (del_timer(&in_dev
->mr_ifc_timer
))
866 __in_dev_put(in_dev
);
867 /* clear deleted report items */
868 igmpv3_clear_delrec(in_dev
);
869 } else if (len
< 12) {
870 return; /* ignore bogus packet; freed by caller */
871 } else if (IGMP_V1_SEEN(in_dev
)) {
872 /* This is a v3 query with v1 queriers present */
873 max_delay
= IGMP_Query_Response_Interval
;
875 } else if (IGMP_V2_SEEN(in_dev
)) {
876 /* this is a v3 query with v2 queriers present;
877 * Interpretation of the max_delay code is problematic here.
878 * A real v2 host would use ih_code directly, while v3 has a
879 * different encoding. We use the v3 encoding as more likely
880 * to be intended in a v3 query.
882 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
884 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
887 ih3
= igmpv3_query_hdr(skb
);
889 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
890 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
892 ih3
= igmpv3_query_hdr(skb
);
895 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
897 max_delay
= 1; /* can't mod w/ 0 */
898 in_dev
->mr_maxdelay
= max_delay
;
900 in_dev
->mr_qrv
= ih3
->qrv
;
901 if (!group
) { /* general query */
903 return; /* no sources allowed */
904 igmp_gq_start_timer(in_dev
);
907 /* mark sources to include, if group & source-specific */
908 mark
= ih3
->nsrcs
!= 0;
912 * - Start the timers in all of our membership records
913 * that the query applies to for the interface on
914 * which the query arrived excl. those that belong
915 * to a "local" group (224.0.0.X)
916 * - For timers already running check if they need to
918 * - Use the igmp->igmp_code field as the maximum
922 for_each_pmc_rcu(in_dev
, im
) {
925 if (group
&& group
!= im
->multiaddr
)
927 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
929 spin_lock_bh(&im
->lock
);
931 im
->gsquery
= im
->gsquery
&& mark
;
934 changed
= !im
->gsquery
||
935 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
936 spin_unlock_bh(&im
->lock
);
938 igmp_mod_timer(im
, max_delay
);
943 /* called in rcu_read_lock() section */
944 int igmp_rcv(struct sk_buff
*skb
)
946 /* This basically follows the spec line by line -- see RFC1112 */
948 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
954 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
957 switch (skb
->ip_summed
) {
958 case CHECKSUM_COMPLETE
:
959 if (!csum_fold(skb
->csum
))
964 if (__skb_checksum_complete(skb
))
970 case IGMP_HOST_MEMBERSHIP_QUERY
:
971 igmp_heard_query(in_dev
, skb
, len
);
973 case IGMP_HOST_MEMBERSHIP_REPORT
:
974 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
975 /* Is it our report looped back? */
976 if (rt_is_output_route(skb_rtable(skb
)))
978 /* don't rely on MC router hearing unicast reports */
979 if (skb
->pkt_type
== PACKET_MULTICAST
||
980 skb
->pkt_type
== PACKET_BROADCAST
)
981 igmp_heard_report(in_dev
, ih
->group
);
984 #ifdef CONFIG_IP_PIMSM_V1
985 return pim_rcv_v1(skb
);
987 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
990 case IGMP_HOST_LEAVE_MESSAGE
:
992 case IGMP_MTRACE_RESP
:
1007 * Add a filter to a device
1010 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1012 char buf
[MAX_ADDR_LEN
];
1013 struct net_device
*dev
= in_dev
->dev
;
1015 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1016 We will get multicast token leakage, when IFF_MULTICAST
1017 is changed. This check should be done in ndo_set_rx_mode
1018 routine. Something sort of:
1019 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1022 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1023 dev_mc_add(dev
, buf
);
1027 * Remove a filter from a device
1030 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1032 char buf
[MAX_ADDR_LEN
];
1033 struct net_device
*dev
= in_dev
->dev
;
1035 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1036 dev_mc_del(dev
, buf
);
1039 #ifdef CONFIG_IP_MULTICAST
1041 * deleted ip_mc_list manipulation
1043 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1045 struct ip_mc_list
*pmc
;
1047 /* this is an "ip_mc_list" for convenience; only the fields below
1048 * are actually used. In particular, the refcnt and users are not
1049 * used for management of the delete list. Using the same structure
1050 * for deleted items allows change reports to use common code with
1051 * non-deleted or query-response MCA's.
1053 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1056 spin_lock_bh(&im
->lock
);
1057 pmc
->interface
= im
->interface
;
1058 in_dev_hold(in_dev
);
1059 pmc
->multiaddr
= im
->multiaddr
;
1060 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1061 IGMP_Unsolicited_Report_Count
;
1062 pmc
->sfmode
= im
->sfmode
;
1063 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1064 struct ip_sf_list
*psf
;
1066 pmc
->tomb
= im
->tomb
;
1067 pmc
->sources
= im
->sources
;
1068 im
->tomb
= im
->sources
= NULL
;
1069 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1070 psf
->sf_crcount
= pmc
->crcount
;
1072 spin_unlock_bh(&im
->lock
);
1074 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1075 pmc
->next
= in_dev
->mc_tomb
;
1076 in_dev
->mc_tomb
= pmc
;
1077 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1080 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1082 struct ip_mc_list
*pmc
, *pmc_prev
;
1083 struct ip_sf_list
*psf
, *psf_next
;
1085 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1087 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1088 if (pmc
->multiaddr
== multiaddr
)
1094 pmc_prev
->next
= pmc
->next
;
1096 in_dev
->mc_tomb
= pmc
->next
;
1098 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1100 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1101 psf_next
= psf
->sf_next
;
1104 in_dev_put(pmc
->interface
);
1109 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1111 struct ip_mc_list
*pmc
, *nextpmc
;
1113 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1114 pmc
= in_dev
->mc_tomb
;
1115 in_dev
->mc_tomb
= NULL
;
1116 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1118 for (; pmc
; pmc
= nextpmc
) {
1119 nextpmc
= pmc
->next
;
1120 ip_mc_clear_src(pmc
);
1121 in_dev_put(pmc
->interface
);
1124 /* clear dead sources, too */
1126 for_each_pmc_rcu(in_dev
, pmc
) {
1127 struct ip_sf_list
*psf
, *psf_next
;
1129 spin_lock_bh(&pmc
->lock
);
1132 spin_unlock_bh(&pmc
->lock
);
1133 for (; psf
; psf
=psf_next
) {
1134 psf_next
= psf
->sf_next
;
1142 static void igmp_group_dropped(struct ip_mc_list
*im
)
1144 struct in_device
*in_dev
= im
->interface
;
1145 #ifdef CONFIG_IP_MULTICAST
1151 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1154 #ifdef CONFIG_IP_MULTICAST
1155 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1158 reporter
= im
->reporter
;
1159 igmp_stop_timer(im
);
1161 if (!in_dev
->dead
) {
1162 if (IGMP_V1_SEEN(in_dev
))
1164 if (IGMP_V2_SEEN(in_dev
)) {
1166 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1170 igmpv3_add_delrec(in_dev
, im
);
1172 igmp_ifc_event(in_dev
);
1177 static void igmp_group_added(struct ip_mc_list
*im
)
1179 struct in_device
*in_dev
= im
->interface
;
1181 if (im
->loaded
== 0) {
1183 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1186 #ifdef CONFIG_IP_MULTICAST
1187 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1192 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1193 spin_lock_bh(&im
->lock
);
1194 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1195 spin_unlock_bh(&im
->lock
);
1200 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1201 IGMP_Unsolicited_Report_Count
;
1202 igmp_ifc_event(in_dev
);
1208 * Multicast list managers
1213 * A socket has joined a multicast group on device dev.
1216 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1218 struct ip_mc_list
*im
;
1222 for_each_pmc_rtnl(in_dev
, im
) {
1223 if (im
->multiaddr
== addr
) {
1225 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1230 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1235 im
->interface
= in_dev
;
1236 in_dev_hold(in_dev
);
1237 im
->multiaddr
= addr
;
1238 /* initial mode is (EX, empty) */
1239 im
->sfmode
= MCAST_EXCLUDE
;
1240 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1241 atomic_set(&im
->refcnt
, 1);
1242 spin_lock_init(&im
->lock
);
1243 #ifdef CONFIG_IP_MULTICAST
1244 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1245 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1248 im
->next_rcu
= in_dev
->mc_list
;
1250 RCU_INIT_POINTER(in_dev
->mc_list
, im
);
1252 #ifdef CONFIG_IP_MULTICAST
1253 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1255 igmp_group_added(im
);
1257 ip_rt_multicast_event(in_dev
);
1261 EXPORT_SYMBOL(ip_mc_inc_group
);
1264 * Resend IGMP JOIN report; used for bonding.
1265 * Called with rcu_read_lock()
1267 void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1269 #ifdef CONFIG_IP_MULTICAST
1270 struct ip_mc_list
*im
;
1273 for_each_pmc_rcu(in_dev
, im
) {
1274 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1277 /* a failover is happening and switches
1278 * must be notified immediately
1280 if (IGMP_V1_SEEN(in_dev
))
1281 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1282 else if (IGMP_V2_SEEN(in_dev
))
1283 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1285 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1286 igmp_send_report(in_dev
, im
, type
);
1290 EXPORT_SYMBOL(ip_mc_rejoin_groups
);
1293 * A socket has left a multicast group on device dev
1296 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1298 struct ip_mc_list
*i
;
1299 struct ip_mc_list __rcu
**ip
;
1303 for (ip
= &in_dev
->mc_list
;
1304 (i
= rtnl_dereference(*ip
)) != NULL
;
1305 ip
= &i
->next_rcu
) {
1306 if (i
->multiaddr
== addr
) {
1307 if (--i
->users
== 0) {
1310 igmp_group_dropped(i
);
1314 ip_rt_multicast_event(in_dev
);
1323 EXPORT_SYMBOL(ip_mc_dec_group
);
1325 /* Device changing type */
1327 void ip_mc_unmap(struct in_device
*in_dev
)
1329 struct ip_mc_list
*pmc
;
1333 for_each_pmc_rtnl(in_dev
, pmc
)
1334 igmp_group_dropped(pmc
);
1337 void ip_mc_remap(struct in_device
*in_dev
)
1339 struct ip_mc_list
*pmc
;
1343 for_each_pmc_rtnl(in_dev
, pmc
)
1344 igmp_group_added(pmc
);
1347 /* Device going down */
1349 void ip_mc_down(struct in_device
*in_dev
)
1351 struct ip_mc_list
*pmc
;
1355 for_each_pmc_rtnl(in_dev
, pmc
)
1356 igmp_group_dropped(pmc
);
1358 #ifdef CONFIG_IP_MULTICAST
1359 in_dev
->mr_ifc_count
= 0;
1360 if (del_timer(&in_dev
->mr_ifc_timer
))
1361 __in_dev_put(in_dev
);
1362 in_dev
->mr_gq_running
= 0;
1363 if (del_timer(&in_dev
->mr_gq_timer
))
1364 __in_dev_put(in_dev
);
1365 igmpv3_clear_delrec(in_dev
);
1368 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1371 void ip_mc_init_dev(struct in_device
*in_dev
)
1375 in_dev
->mc_tomb
= NULL
;
1376 #ifdef CONFIG_IP_MULTICAST
1377 in_dev
->mr_gq_running
= 0;
1378 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1379 (unsigned long)in_dev
);
1380 in_dev
->mr_ifc_count
= 0;
1381 in_dev
->mc_count
= 0;
1382 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1383 (unsigned long)in_dev
);
1384 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1387 spin_lock_init(&in_dev
->mc_tomb_lock
);
1390 /* Device going up */
1392 void ip_mc_up(struct in_device
*in_dev
)
1394 struct ip_mc_list
*pmc
;
1398 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1400 for_each_pmc_rtnl(in_dev
, pmc
)
1401 igmp_group_added(pmc
);
1405 * Device is about to be destroyed: clean up.
1408 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1410 struct ip_mc_list
*i
;
1414 /* Deactivate timers */
1417 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1418 in_dev
->mc_list
= i
->next_rcu
;
1421 /* We've dropped the groups in ip_mc_down already */
1427 /* RTNL is locked */
1428 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1430 struct net_device
*dev
= NULL
;
1431 struct in_device
*idev
= NULL
;
1433 if (imr
->imr_ifindex
) {
1434 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1437 if (imr
->imr_address
.s_addr
) {
1438 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1444 struct rtable
*rt
= ip_route_output(net
,
1445 imr
->imr_multiaddr
.s_addr
,
1453 imr
->imr_ifindex
= dev
->ifindex
;
1454 idev
= __in_dev_get_rtnl(dev
);
1460 * Join a socket to a group
1462 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1463 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1466 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1469 struct ip_sf_list
*psf
, *psf_prev
;
1473 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1474 if (psf
->sf_inaddr
== *psfsrc
)
1478 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1479 /* source filter not found, or count wrong => bug */
1482 psf
->sf_count
[sfmode
]--;
1483 if (psf
->sf_count
[sfmode
] == 0) {
1484 ip_rt_multicast_event(pmc
->interface
);
1486 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1487 #ifdef CONFIG_IP_MULTICAST
1488 struct in_device
*in_dev
= pmc
->interface
;
1491 /* no more filters for this source */
1493 psf_prev
->sf_next
= psf
->sf_next
;
1495 pmc
->sources
= psf
->sf_next
;
1496 #ifdef CONFIG_IP_MULTICAST
1497 if (psf
->sf_oldin
&&
1498 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1499 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1500 IGMP_Unsolicited_Report_Count
;
1501 psf
->sf_next
= pmc
->tomb
;
1511 #ifndef CONFIG_IP_MULTICAST
1512 #define igmp_ifc_event(x) do { } while (0)
1515 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1516 int sfcount
, __be32
*psfsrc
, int delta
)
1518 struct ip_mc_list
*pmc
;
1525 for_each_pmc_rcu(in_dev
, pmc
) {
1526 if (*pmca
== pmc
->multiaddr
)
1530 /* MCA not found?? bug */
1534 spin_lock_bh(&pmc
->lock
);
1536 #ifdef CONFIG_IP_MULTICAST
1541 if (!pmc
->sfcount
[sfmode
])
1543 pmc
->sfcount
[sfmode
]--;
1546 for (i
=0; i
<sfcount
; i
++) {
1547 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1549 changerec
|= rv
> 0;
1553 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1554 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1555 pmc
->sfcount
[MCAST_INCLUDE
]) {
1556 #ifdef CONFIG_IP_MULTICAST
1557 struct ip_sf_list
*psf
;
1560 /* filter mode change */
1561 pmc
->sfmode
= MCAST_INCLUDE
;
1562 #ifdef CONFIG_IP_MULTICAST
1563 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1564 IGMP_Unsolicited_Report_Count
;
1565 in_dev
->mr_ifc_count
= pmc
->crcount
;
1566 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1567 psf
->sf_crcount
= 0;
1568 igmp_ifc_event(pmc
->interface
);
1569 } else if (sf_setstate(pmc
) || changerec
) {
1570 igmp_ifc_event(pmc
->interface
);
1574 spin_unlock_bh(&pmc
->lock
);
1579 * Add multicast single-source filter to the interface list
1581 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1584 struct ip_sf_list
*psf
, *psf_prev
;
1587 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1588 if (psf
->sf_inaddr
== *psfsrc
)
1593 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1596 psf
->sf_inaddr
= *psfsrc
;
1598 psf_prev
->sf_next
= psf
;
1602 psf
->sf_count
[sfmode
]++;
1603 if (psf
->sf_count
[sfmode
] == 1) {
1604 ip_rt_multicast_event(pmc
->interface
);
1609 #ifdef CONFIG_IP_MULTICAST
1610 static void sf_markstate(struct ip_mc_list
*pmc
)
1612 struct ip_sf_list
*psf
;
1613 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1615 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1616 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1617 psf
->sf_oldin
= mca_xcount
==
1618 psf
->sf_count
[MCAST_EXCLUDE
] &&
1619 !psf
->sf_count
[MCAST_INCLUDE
];
1621 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1624 static int sf_setstate(struct ip_mc_list
*pmc
)
1626 struct ip_sf_list
*psf
, *dpsf
;
1627 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1628 int qrv
= pmc
->interface
->mr_qrv
;
1632 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1633 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1634 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1635 !psf
->sf_count
[MCAST_INCLUDE
];
1637 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1639 if (!psf
->sf_oldin
) {
1640 struct ip_sf_list
*prev
= NULL
;
1642 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1643 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1649 prev
->sf_next
= dpsf
->sf_next
;
1651 pmc
->tomb
= dpsf
->sf_next
;
1654 psf
->sf_crcount
= qrv
;
1657 } else if (psf
->sf_oldin
) {
1659 psf
->sf_crcount
= 0;
1661 * add or update "delete" records if an active filter
1664 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1665 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1668 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1672 /* pmc->lock held by callers */
1673 dpsf
->sf_next
= pmc
->tomb
;
1676 dpsf
->sf_crcount
= qrv
;
1685 * Add multicast source filter list to the interface list
1687 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1688 int sfcount
, __be32
*psfsrc
, int delta
)
1690 struct ip_mc_list
*pmc
;
1697 for_each_pmc_rcu(in_dev
, pmc
) {
1698 if (*pmca
== pmc
->multiaddr
)
1702 /* MCA not found?? bug */
1706 spin_lock_bh(&pmc
->lock
);
1709 #ifdef CONFIG_IP_MULTICAST
1712 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1714 pmc
->sfcount
[sfmode
]++;
1716 for (i
=0; i
<sfcount
; i
++) {
1717 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
1725 pmc
->sfcount
[sfmode
]--;
1727 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
1728 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1729 #ifdef CONFIG_IP_MULTICAST
1730 struct ip_sf_list
*psf
;
1731 in_dev
= pmc
->interface
;
1734 /* filter mode change */
1735 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1736 pmc
->sfmode
= MCAST_EXCLUDE
;
1737 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1738 pmc
->sfmode
= MCAST_INCLUDE
;
1739 #ifdef CONFIG_IP_MULTICAST
1740 /* else no filters; keep old mode for reports */
1742 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1743 IGMP_Unsolicited_Report_Count
;
1744 in_dev
->mr_ifc_count
= pmc
->crcount
;
1745 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1746 psf
->sf_crcount
= 0;
1747 igmp_ifc_event(in_dev
);
1748 } else if (sf_setstate(pmc
)) {
1749 igmp_ifc_event(in_dev
);
1752 spin_unlock_bh(&pmc
->lock
);
1756 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1758 struct ip_sf_list
*psf
, *nextpsf
;
1760 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1761 nextpsf
= psf
->sf_next
;
1765 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1766 nextpsf
= psf
->sf_next
;
1769 pmc
->sources
= NULL
;
1770 pmc
->sfmode
= MCAST_EXCLUDE
;
1771 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1772 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1777 * Join a multicast group
1779 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1782 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1783 struct ip_mc_socklist
*iml
= NULL
, *i
;
1784 struct in_device
*in_dev
;
1785 struct inet_sock
*inet
= inet_sk(sk
);
1786 struct net
*net
= sock_net(sk
);
1790 if (!ipv4_is_multicast(addr
))
1795 in_dev
= ip_mc_find_dev(net
, imr
);
1804 ifindex
= imr
->imr_ifindex
;
1805 for_each_pmc_rtnl(inet
, i
) {
1806 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1807 i
->multi
.imr_ifindex
== ifindex
)
1812 if (count
>= sysctl_igmp_max_memberships
)
1814 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1818 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1819 iml
->next_rcu
= inet
->mc_list
;
1821 iml
->sfmode
= MCAST_EXCLUDE
;
1822 RCU_INIT_POINTER(inet
->mc_list
, iml
);
1823 ip_mc_inc_group(in_dev
, addr
);
1829 EXPORT_SYMBOL(ip_mc_join_group
);
1831 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1832 struct in_device
*in_dev
)
1834 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1838 /* any-source empty exclude case */
1839 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1840 iml
->sfmode
, 0, NULL
, 0);
1842 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1843 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1844 RCU_INIT_POINTER(iml
->sflist
, NULL
);
1845 /* decrease mem now to avoid the memleak warning */
1846 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1847 kfree_rcu(psf
, rcu
);
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
;
1859 struct ip_mc_socklist __rcu
**imlp
;
1860 struct in_device
*in_dev
;
1861 struct net
*net
= sock_net(sk
);
1862 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1864 int ret
= -EADDRNOTAVAIL
;
1867 in_dev
= ip_mc_find_dev(net
, imr
);
1868 ifindex
= imr
->imr_ifindex
;
1869 for (imlp
= &inet
->mc_list
;
1870 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1871 imlp
= &iml
->next_rcu
) {
1872 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1875 if (iml
->multi
.imr_ifindex
!= ifindex
)
1877 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1878 iml
->multi
.imr_address
.s_addr
)
1881 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1883 *imlp
= iml
->next_rcu
;
1886 ip_mc_dec_group(in_dev
, group
);
1888 /* decrease mem now to avoid the memleak warning */
1889 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1890 kfree_rcu(iml
, rcu
);
1899 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1900 ip_mreq_source
*mreqs
, int ifindex
)
1903 struct ip_mreqn imr
;
1904 __be32 addr
= mreqs
->imr_multiaddr
;
1905 struct ip_mc_socklist
*pmc
;
1906 struct in_device
*in_dev
= NULL
;
1907 struct inet_sock
*inet
= inet_sk(sk
);
1908 struct ip_sf_socklist
*psl
;
1909 struct net
*net
= sock_net(sk
);
1913 if (!ipv4_is_multicast(addr
))
1918 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1919 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1920 imr
.imr_ifindex
= ifindex
;
1921 in_dev
= ip_mc_find_dev(net
, &imr
);
1927 err
= -EADDRNOTAVAIL
;
1929 for_each_pmc_rtnl(inet
, pmc
) {
1930 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1931 imr
.imr_multiaddr
.s_addr
) &&
1932 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1935 if (!pmc
) { /* must have a prior join */
1939 /* if a source filter was set, must be the same mode as before */
1941 if (pmc
->sfmode
!= omode
) {
1945 } else if (pmc
->sfmode
!= omode
) {
1946 /* allow mode switches for empty-set filters */
1947 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1948 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1950 pmc
->sfmode
= omode
;
1953 psl
= rtnl_dereference(pmc
->sflist
);
1956 goto done
; /* err = -EADDRNOTAVAIL */
1958 for (i
=0; i
<psl
->sl_count
; i
++) {
1959 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1964 if (rv
) /* source not found */
1965 goto done
; /* err = -EADDRNOTAVAIL */
1967 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1968 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1973 /* update the interface filter */
1974 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1975 &mreqs
->imr_sourceaddr
, 1);
1977 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1978 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1983 /* else, add a new source to the filter */
1985 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
1989 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
1990 struct ip_sf_socklist
*newpsl
;
1991 int count
= IP_SFBLOCK
;
1994 count
+= psl
->sl_max
;
1995 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2000 newpsl
->sl_max
= count
;
2001 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2003 for (i
=0; i
<psl
->sl_count
; i
++)
2004 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2005 /* decrease mem now to avoid the memleak warning */
2006 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2007 kfree_rcu(psl
, rcu
);
2009 RCU_INIT_POINTER(pmc
->sflist
, newpsl
);
2012 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2013 for (i
=0; i
<psl
->sl_count
; i
++) {
2014 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2019 if (rv
== 0) /* address already there is an error */
2021 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2022 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2023 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2026 /* update the interface list */
2027 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2028 &mreqs
->imr_sourceaddr
, 1);
2032 return ip_mc_leave_group(sk
, &imr
);
2036 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2039 struct ip_mreqn imr
;
2040 __be32 addr
= msf
->imsf_multiaddr
;
2041 struct ip_mc_socklist
*pmc
;
2042 struct in_device
*in_dev
;
2043 struct inet_sock
*inet
= inet_sk(sk
);
2044 struct ip_sf_socklist
*newpsl
, *psl
;
2045 struct net
*net
= sock_net(sk
);
2048 if (!ipv4_is_multicast(addr
))
2050 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2051 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2056 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2057 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2058 imr
.imr_ifindex
= ifindex
;
2059 in_dev
= ip_mc_find_dev(net
, &imr
);
2066 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2067 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2072 for_each_pmc_rtnl(inet
, pmc
) {
2073 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2074 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2077 if (!pmc
) { /* must have a prior join */
2081 if (msf
->imsf_numsrc
) {
2082 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2088 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2089 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2090 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2091 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2092 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2094 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2099 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2100 msf
->imsf_fmode
, 0, NULL
, 0);
2102 psl
= rtnl_dereference(pmc
->sflist
);
2104 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2105 psl
->sl_count
, psl
->sl_addr
, 0);
2106 /* decrease mem now to avoid the memleak warning */
2107 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2108 kfree_rcu(psl
, rcu
);
2110 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2112 RCU_INIT_POINTER(pmc
->sflist
, newpsl
);
2113 pmc
->sfmode
= msf
->imsf_fmode
;
2118 err
= ip_mc_leave_group(sk
, &imr
);
2122 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2123 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2125 int err
, len
, count
, copycount
;
2126 struct ip_mreqn imr
;
2127 __be32 addr
= msf
->imsf_multiaddr
;
2128 struct ip_mc_socklist
*pmc
;
2129 struct in_device
*in_dev
;
2130 struct inet_sock
*inet
= inet_sk(sk
);
2131 struct ip_sf_socklist
*psl
;
2132 struct net
*net
= sock_net(sk
);
2134 if (!ipv4_is_multicast(addr
))
2139 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2140 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2141 imr
.imr_ifindex
= 0;
2142 in_dev
= ip_mc_find_dev(net
, &imr
);
2148 err
= -EADDRNOTAVAIL
;
2150 for_each_pmc_rtnl(inet
, pmc
) {
2151 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2152 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2155 if (!pmc
) /* must have a prior join */
2157 msf
->imsf_fmode
= pmc
->sfmode
;
2158 psl
= rtnl_dereference(pmc
->sflist
);
2164 count
= psl
->sl_count
;
2166 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2167 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2168 msf
->imsf_numsrc
= count
;
2169 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2170 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2174 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2182 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2183 struct group_filter __user
*optval
, int __user
*optlen
)
2185 int err
, i
, count
, copycount
;
2186 struct sockaddr_in
*psin
;
2188 struct ip_mc_socklist
*pmc
;
2189 struct inet_sock
*inet
= inet_sk(sk
);
2190 struct ip_sf_socklist
*psl
;
2192 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2193 if (psin
->sin_family
!= AF_INET
)
2195 addr
= psin
->sin_addr
.s_addr
;
2196 if (!ipv4_is_multicast(addr
))
2201 err
= -EADDRNOTAVAIL
;
2203 for_each_pmc_rtnl(inet
, pmc
) {
2204 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2205 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2208 if (!pmc
) /* must have a prior join */
2210 gsf
->gf_fmode
= pmc
->sfmode
;
2211 psl
= rtnl_dereference(pmc
->sflist
);
2213 count
= psl
? psl
->sl_count
: 0;
2214 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2215 gsf
->gf_numsrc
= count
;
2216 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2217 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2220 for (i
=0; i
<copycount
; i
++) {
2221 struct sockaddr_storage ss
;
2223 psin
= (struct sockaddr_in
*)&ss
;
2224 memset(&ss
, 0, sizeof(ss
));
2225 psin
->sin_family
= AF_INET
;
2226 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2227 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2237 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2239 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2241 struct inet_sock
*inet
= inet_sk(sk
);
2242 struct ip_mc_socklist
*pmc
;
2243 struct ip_sf_socklist
*psl
;
2248 if (!ipv4_is_multicast(loc_addr
))
2252 for_each_pmc_rcu(inet
, pmc
) {
2253 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2254 pmc
->multi
.imr_ifindex
== dif
)
2260 psl
= rcu_dereference(pmc
->sflist
);
2261 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2265 for (i
=0; i
<psl
->sl_count
; i
++) {
2266 if (psl
->sl_addr
[i
] == rmt_addr
)
2270 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2272 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2282 * A socket is closing.
2285 void ip_mc_drop_socket(struct sock
*sk
)
2287 struct inet_sock
*inet
= inet_sk(sk
);
2288 struct ip_mc_socklist
*iml
;
2289 struct net
*net
= sock_net(sk
);
2291 if (inet
->mc_list
== NULL
)
2295 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2296 struct in_device
*in_dev
;
2298 inet
->mc_list
= iml
->next_rcu
;
2299 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2300 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2302 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2303 /* decrease mem now to avoid the memleak warning */
2304 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2305 kfree_rcu(iml
, rcu
);
2310 /* called with rcu_read_lock() */
2311 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2313 struct ip_mc_list
*im
;
2314 struct ip_sf_list
*psf
;
2317 for_each_pmc_rcu(in_dev
, im
) {
2318 if (im
->multiaddr
== mc_addr
)
2321 if (im
&& proto
== IPPROTO_IGMP
) {
2325 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2326 if (psf
->sf_inaddr
== src_addr
)
2330 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2331 psf
->sf_count
[MCAST_EXCLUDE
] !=
2332 im
->sfcount
[MCAST_EXCLUDE
];
2334 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2336 rv
= 1; /* unspecified source; tentatively allow */
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 im
= rcu_dereference(in_dev
->mc_list
);
2365 state
->in_dev
= in_dev
;
2372 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2374 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2376 im
= rcu_dereference(im
->next_rcu
);
2378 state
->dev
= next_net_device_rcu(state
->dev
);
2380 state
->in_dev
= NULL
;
2383 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2386 im
= rcu_dereference(state
->in_dev
->mc_list
);
2391 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2393 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2395 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2397 return pos
? NULL
: im
;
2400 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2404 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2407 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2409 struct ip_mc_list
*im
;
2410 if (v
== SEQ_START_TOKEN
)
2411 im
= igmp_mc_get_first(seq
);
2413 im
= igmp_mc_get_next(seq
, v
);
2418 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2421 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2423 state
->in_dev
= NULL
;
2428 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2430 if (v
== SEQ_START_TOKEN
)
2432 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2434 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2435 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2437 #ifdef CONFIG_IP_MULTICAST
2438 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2439 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2445 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2446 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2447 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2451 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2452 im
->multiaddr
, im
->users
,
2453 im
->tm_running
, im
->tm_running
?
2454 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2460 static const struct seq_operations igmp_mc_seq_ops
= {
2461 .start
= igmp_mc_seq_start
,
2462 .next
= igmp_mc_seq_next
,
2463 .stop
= igmp_mc_seq_stop
,
2464 .show
= igmp_mc_seq_show
,
2467 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2469 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2470 sizeof(struct igmp_mc_iter_state
));
2473 static const struct file_operations igmp_mc_seq_fops
= {
2474 .owner
= THIS_MODULE
,
2475 .open
= igmp_mc_seq_open
,
2477 .llseek
= seq_lseek
,
2478 .release
= seq_release_net
,
2481 struct igmp_mcf_iter_state
{
2482 struct seq_net_private p
;
2483 struct net_device
*dev
;
2484 struct in_device
*idev
;
2485 struct ip_mc_list
*im
;
2488 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2490 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2492 struct net
*net
= seq_file_net(seq
);
2493 struct ip_sf_list
*psf
= NULL
;
2494 struct ip_mc_list
*im
= NULL
;
2495 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2499 for_each_netdev_rcu(net
, state
->dev
) {
2500 struct in_device
*idev
;
2501 idev
= __in_dev_get_rcu(state
->dev
);
2502 if (unlikely(idev
== NULL
))
2504 im
= rcu_dereference(idev
->mc_list
);
2505 if (likely(im
!= NULL
)) {
2506 spin_lock_bh(&im
->lock
);
2508 if (likely(psf
!= NULL
)) {
2513 spin_unlock_bh(&im
->lock
);
2519 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2521 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2525 spin_unlock_bh(&state
->im
->lock
);
2526 state
->im
= state
->im
->next
;
2527 while (!state
->im
) {
2528 state
->dev
= next_net_device_rcu(state
->dev
);
2533 state
->idev
= __in_dev_get_rcu(state
->dev
);
2536 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2540 spin_lock_bh(&state
->im
->lock
);
2541 psf
= state
->im
->sources
;
2547 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2549 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2551 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2553 return pos
? NULL
: psf
;
2556 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2560 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2563 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2565 struct ip_sf_list
*psf
;
2566 if (v
== SEQ_START_TOKEN
)
2567 psf
= igmp_mcf_get_first(seq
);
2569 psf
= igmp_mcf_get_next(seq
, v
);
2574 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2577 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2578 if (likely(state
->im
!= NULL
)) {
2579 spin_unlock_bh(&state
->im
->lock
);
2587 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2589 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2590 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2592 if (v
== SEQ_START_TOKEN
) {
2595 "%10s %10s %6s %6s\n", "Idx",
2597 "SRC", "INC", "EXC");
2601 "0x%08x %6lu %6lu\n",
2602 state
->dev
->ifindex
, state
->dev
->name
,
2603 ntohl(state
->im
->multiaddr
),
2604 ntohl(psf
->sf_inaddr
),
2605 psf
->sf_count
[MCAST_INCLUDE
],
2606 psf
->sf_count
[MCAST_EXCLUDE
]);
2611 static const struct seq_operations igmp_mcf_seq_ops
= {
2612 .start
= igmp_mcf_seq_start
,
2613 .next
= igmp_mcf_seq_next
,
2614 .stop
= igmp_mcf_seq_stop
,
2615 .show
= igmp_mcf_seq_show
,
2618 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2620 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2621 sizeof(struct igmp_mcf_iter_state
));
2624 static const struct file_operations igmp_mcf_seq_fops
= {
2625 .owner
= THIS_MODULE
,
2626 .open
= igmp_mcf_seq_open
,
2628 .llseek
= seq_lseek
,
2629 .release
= seq_release_net
,
2632 static int __net_init
igmp_net_init(struct net
*net
)
2634 struct proc_dir_entry
*pde
;
2636 pde
= proc_net_fops_create(net
, "igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2639 pde
= proc_net_fops_create(net
, "mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2645 proc_net_remove(net
, "igmp");
2650 static void __net_exit
igmp_net_exit(struct net
*net
)
2652 proc_net_remove(net
, "mcfilter");
2653 proc_net_remove(net
, "igmp");
2656 static struct pernet_operations igmp_net_ops
= {
2657 .init
= igmp_net_init
,
2658 .exit
= igmp_net_exit
,
2661 int __init
igmp_mc_proc_init(void)
2663 return register_pernet_subsys(&igmp_net_ops
);