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
);
153 static void ip_mc_list_reclaim(struct rcu_head
*head
)
155 kfree(container_of(head
, struct ip_mc_list
, rcu
));
158 static void ip_ma_put(struct ip_mc_list
*im
)
160 if (atomic_dec_and_test(&im
->refcnt
)) {
161 in_dev_put(im
->interface
);
162 call_rcu(&im
->rcu
, ip_mc_list_reclaim
);
166 #define for_each_pmc_rcu(in_dev, pmc) \
167 for (pmc = rcu_dereference(in_dev->mc_list); \
169 pmc = rcu_dereference(pmc->next_rcu))
171 #define for_each_pmc_rtnl(in_dev, pmc) \
172 for (pmc = rtnl_dereference(in_dev->mc_list); \
174 pmc = rtnl_dereference(pmc->next_rcu))
176 #ifdef CONFIG_IP_MULTICAST
182 static void igmp_stop_timer(struct ip_mc_list
*im
)
184 spin_lock_bh(&im
->lock
);
185 if (del_timer(&im
->timer
))
186 atomic_dec(&im
->refcnt
);
189 im
->unsolicit_count
= 0;
190 spin_unlock_bh(&im
->lock
);
193 /* It must be called with locked im->lock */
194 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
196 int tv
= net_random() % max_delay
;
199 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
200 atomic_inc(&im
->refcnt
);
203 static void igmp_gq_start_timer(struct in_device
*in_dev
)
205 int tv
= net_random() % in_dev
->mr_maxdelay
;
207 in_dev
->mr_gq_running
= 1;
208 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
212 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
214 int tv
= net_random() % delay
;
216 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
220 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
222 spin_lock_bh(&im
->lock
);
223 im
->unsolicit_count
= 0;
224 if (del_timer(&im
->timer
)) {
225 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
226 add_timer(&im
->timer
);
228 spin_unlock_bh(&im
->lock
);
231 atomic_dec(&im
->refcnt
);
233 igmp_start_timer(im
, max_delay
);
234 spin_unlock_bh(&im
->lock
);
239 * Send an IGMP report.
242 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
245 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
246 int gdeleted
, int sdeleted
)
249 case IGMPV3_MODE_IS_INCLUDE
:
250 case IGMPV3_MODE_IS_EXCLUDE
:
251 if (gdeleted
|| sdeleted
)
253 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
254 if (pmc
->sfmode
== MCAST_INCLUDE
)
256 /* don't include if this source is excluded
259 if (psf
->sf_count
[MCAST_INCLUDE
])
260 return type
== IGMPV3_MODE_IS_INCLUDE
;
261 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
262 psf
->sf_count
[MCAST_EXCLUDE
];
265 case IGMPV3_CHANGE_TO_INCLUDE
:
266 if (gdeleted
|| sdeleted
)
268 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
269 case IGMPV3_CHANGE_TO_EXCLUDE
:
270 if (gdeleted
|| sdeleted
)
272 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
273 psf
->sf_count
[MCAST_INCLUDE
])
275 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
276 psf
->sf_count
[MCAST_EXCLUDE
];
277 case IGMPV3_ALLOW_NEW_SOURCES
:
278 if (gdeleted
|| !psf
->sf_crcount
)
280 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
281 case IGMPV3_BLOCK_OLD_SOURCES
:
282 if (pmc
->sfmode
== MCAST_INCLUDE
)
283 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
284 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
290 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
292 struct ip_sf_list
*psf
;
295 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
296 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
303 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
305 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
310 struct igmpv3_report
*pig
;
311 struct net
*net
= dev_net(dev
);
314 skb
= alloc_skb(size
+ LL_ALLOCATED_SPACE(dev
),
315 GFP_ATOMIC
| __GFP_NOWARN
);
322 igmp_skb_size(skb
) = size
;
324 rt
= ip_route_output_ports(net
, NULL
, IGMPV3_ALL_MCR
, 0,
326 IPPROTO_IGMP
, 0, dev
->ifindex
);
332 skb_dst_set(skb
, &rt
->dst
);
335 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
337 skb_reset_network_header(skb
);
339 skb_put(skb
, sizeof(struct iphdr
) + 4);
342 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
344 pip
->frag_off
= htons(IP_DF
);
346 pip
->daddr
= rt
->rt_dst
;
347 pip
->saddr
= rt
->rt_src
;
348 pip
->protocol
= IPPROTO_IGMP
;
349 pip
->tot_len
= 0; /* filled in later */
350 ip_select_ident(pip
, &rt
->dst
, NULL
);
351 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
352 ((u8
*)&pip
[1])[1] = 4;
353 ((u8
*)&pip
[1])[2] = 0;
354 ((u8
*)&pip
[1])[3] = 0;
356 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
357 skb_put(skb
, sizeof(*pig
));
358 pig
= igmpv3_report_hdr(skb
);
359 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
367 static int igmpv3_sendpack(struct sk_buff
*skb
)
369 struct igmphdr
*pig
= igmp_hdr(skb
);
370 const int igmplen
= skb
->tail
- skb
->transport_header
;
372 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
374 return ip_local_out(skb
);
377 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
379 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
382 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
383 int type
, struct igmpv3_grec
**ppgr
)
385 struct net_device
*dev
= pmc
->interface
->dev
;
386 struct igmpv3_report
*pih
;
387 struct igmpv3_grec
*pgr
;
390 skb
= igmpv3_newpack(dev
, dev
->mtu
);
393 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
394 pgr
->grec_type
= type
;
395 pgr
->grec_auxwords
= 0;
397 pgr
->grec_mca
= pmc
->multiaddr
;
398 pih
= igmpv3_report_hdr(skb
);
399 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
404 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
405 skb_tailroom(skb)) : 0)
407 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
408 int type
, int gdeleted
, int sdeleted
)
410 struct net_device
*dev
= pmc
->interface
->dev
;
411 struct igmpv3_report
*pih
;
412 struct igmpv3_grec
*pgr
= NULL
;
413 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
414 int scount
, stotal
, first
, isquery
, truncate
;
416 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
419 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
420 type
== IGMPV3_MODE_IS_EXCLUDE
;
421 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
422 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
426 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
431 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
433 /* EX and TO_EX get a fresh packet, if needed */
435 if (pih
&& pih
->ngrec
&&
436 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
438 igmpv3_sendpack(skb
);
439 skb
= igmpv3_newpack(dev
, dev
->mtu
);
444 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
447 psf_next
= psf
->sf_next
;
449 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
454 /* clear marks on query responses */
458 if (AVAILABLE(skb
) < sizeof(__be32
) +
459 first
*sizeof(struct igmpv3_grec
)) {
460 if (truncate
&& !first
)
461 break; /* truncate these */
463 pgr
->grec_nsrcs
= htons(scount
);
465 igmpv3_sendpack(skb
);
466 skb
= igmpv3_newpack(dev
, dev
->mtu
);
471 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
476 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
477 *psrc
= psf
->sf_inaddr
;
479 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
480 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
482 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
484 psf_prev
->sf_next
= psf
->sf_next
;
486 *psf_list
= psf
->sf_next
;
496 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
497 type
== IGMPV3_BLOCK_OLD_SOURCES
)
499 if (pmc
->crcount
|| isquery
) {
500 /* make sure we have room for group header */
501 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
502 igmpv3_sendpack(skb
);
503 skb
= NULL
; /* add_grhead will get a new one */
505 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
509 pgr
->grec_nsrcs
= htons(scount
);
512 pmc
->gsquery
= 0; /* clear query state on report */
516 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
518 struct sk_buff
*skb
= NULL
;
523 for_each_pmc_rcu(in_dev
, pmc
) {
524 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
526 spin_lock_bh(&pmc
->lock
);
527 if (pmc
->sfcount
[MCAST_EXCLUDE
])
528 type
= IGMPV3_MODE_IS_EXCLUDE
;
530 type
= IGMPV3_MODE_IS_INCLUDE
;
531 skb
= add_grec(skb
, pmc
, type
, 0, 0);
532 spin_unlock_bh(&pmc
->lock
);
536 spin_lock_bh(&pmc
->lock
);
537 if (pmc
->sfcount
[MCAST_EXCLUDE
])
538 type
= IGMPV3_MODE_IS_EXCLUDE
;
540 type
= IGMPV3_MODE_IS_INCLUDE
;
541 skb
= add_grec(skb
, pmc
, type
, 0, 0);
542 spin_unlock_bh(&pmc
->lock
);
546 return igmpv3_sendpack(skb
);
550 * remove zero-count source records from a source filter list
552 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
554 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
557 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
558 psf_next
= psf
->sf_next
;
559 if (psf
->sf_crcount
== 0) {
561 psf_prev
->sf_next
= psf
->sf_next
;
563 *ppsf
= psf
->sf_next
;
570 static void igmpv3_send_cr(struct in_device
*in_dev
)
572 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
573 struct sk_buff
*skb
= NULL
;
577 spin_lock_bh(&in_dev
->mc_tomb_lock
);
581 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
582 pmc_next
= pmc
->next
;
583 if (pmc
->sfmode
== MCAST_INCLUDE
) {
584 type
= IGMPV3_BLOCK_OLD_SOURCES
;
585 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
586 skb
= add_grec(skb
, pmc
, type
, 1, 0);
587 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
590 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
591 type
= IGMPV3_CHANGE_TO_INCLUDE
;
592 skb
= add_grec(skb
, pmc
, type
, 1, 0);
595 if (pmc
->crcount
== 0) {
596 igmpv3_clear_zeros(&pmc
->tomb
);
597 igmpv3_clear_zeros(&pmc
->sources
);
600 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
602 pmc_prev
->next
= pmc_next
;
604 in_dev
->mc_tomb
= pmc_next
;
605 in_dev_put(pmc
->interface
);
610 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
613 for_each_pmc_rcu(in_dev
, pmc
) {
614 spin_lock_bh(&pmc
->lock
);
615 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
616 type
= IGMPV3_BLOCK_OLD_SOURCES
;
617 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
619 type
= IGMPV3_ALLOW_NEW_SOURCES
;
620 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
622 skb
= add_grec(skb
, pmc
, type
, 0, 0);
623 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
625 /* filter mode changes */
627 if (pmc
->sfmode
== MCAST_EXCLUDE
)
628 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
630 type
= IGMPV3_CHANGE_TO_INCLUDE
;
631 skb
= add_grec(skb
, pmc
, type
, 0, 0);
634 spin_unlock_bh(&pmc
->lock
);
640 (void) igmpv3_sendpack(skb
);
643 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
650 struct net_device
*dev
= in_dev
->dev
;
651 struct net
*net
= dev_net(dev
);
652 __be32 group
= pmc
? pmc
->multiaddr
: 0;
655 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
656 return igmpv3_send_report(in_dev
, pmc
);
657 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
658 dst
= IGMP_ALL_ROUTER
;
662 rt
= ip_route_output_ports(net
, NULL
, dst
, 0,
664 IPPROTO_IGMP
, 0, dev
->ifindex
);
668 skb
= alloc_skb(IGMP_SIZE
+LL_ALLOCATED_SPACE(dev
), GFP_ATOMIC
);
674 skb_dst_set(skb
, &rt
->dst
);
676 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
678 skb_reset_network_header(skb
);
680 skb_put(skb
, sizeof(struct iphdr
) + 4);
683 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
685 iph
->frag_off
= htons(IP_DF
);
688 iph
->saddr
= rt
->rt_src
;
689 iph
->protocol
= IPPROTO_IGMP
;
690 ip_select_ident(iph
, &rt
->dst
, NULL
);
691 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
692 ((u8
*)&iph
[1])[1] = 4;
693 ((u8
*)&iph
[1])[2] = 0;
694 ((u8
*)&iph
[1])[3] = 0;
696 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
701 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
703 return ip_local_out(skb
);
706 static void igmp_gq_timer_expire(unsigned long data
)
708 struct in_device
*in_dev
= (struct in_device
*)data
;
710 in_dev
->mr_gq_running
= 0;
711 igmpv3_send_report(in_dev
, NULL
);
712 __in_dev_put(in_dev
);
715 static void igmp_ifc_timer_expire(unsigned long data
)
717 struct in_device
*in_dev
= (struct in_device
*)data
;
719 igmpv3_send_cr(in_dev
);
720 if (in_dev
->mr_ifc_count
) {
721 in_dev
->mr_ifc_count
--;
722 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
724 __in_dev_put(in_dev
);
727 static void igmp_ifc_event(struct in_device
*in_dev
)
729 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
731 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
732 IGMP_Unsolicited_Report_Count
;
733 igmp_ifc_start_timer(in_dev
, 1);
737 static void igmp_timer_expire(unsigned long data
)
739 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
740 struct in_device
*in_dev
= im
->interface
;
742 spin_lock(&im
->lock
);
745 if (im
->unsolicit_count
) {
746 im
->unsolicit_count
--;
747 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
750 spin_unlock(&im
->lock
);
752 if (IGMP_V1_SEEN(in_dev
))
753 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
754 else if (IGMP_V2_SEEN(in_dev
))
755 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
757 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
762 /* mark EXCLUDE-mode sources */
763 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
765 struct ip_sf_list
*psf
;
769 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
772 for (i
=0; i
<nsrcs
; i
++) {
773 /* skip inactive filters */
774 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
775 pmc
->sfcount
[MCAST_EXCLUDE
] !=
776 psf
->sf_count
[MCAST_EXCLUDE
])
778 if (srcs
[i
] == psf
->sf_inaddr
) {
785 if (scount
== nsrcs
) /* all sources excluded */
790 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
792 struct ip_sf_list
*psf
;
795 if (pmc
->sfmode
== MCAST_EXCLUDE
)
796 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
798 /* mark INCLUDE-mode sources */
800 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
803 for (i
=0; i
<nsrcs
; i
++)
804 if (srcs
[i
] == psf
->sf_inaddr
) {
818 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
820 struct ip_mc_list
*im
;
822 /* Timers are only set for non-local groups */
824 if (group
== IGMP_ALL_HOSTS
)
828 for_each_pmc_rcu(in_dev
, im
) {
829 if (im
->multiaddr
== group
) {
837 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
840 struct igmphdr
*ih
= igmp_hdr(skb
);
841 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
842 struct ip_mc_list
*im
;
843 __be32 group
= ih
->group
;
850 /* Alas, old v1 router presents here. */
852 max_delay
= IGMP_Query_Response_Interval
;
853 in_dev
->mr_v1_seen
= jiffies
+
854 IGMP_V1_Router_Present_Timeout
;
857 /* v2 router present */
858 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
859 in_dev
->mr_v2_seen
= jiffies
+
860 IGMP_V2_Router_Present_Timeout
;
862 /* cancel the interface change timer */
863 in_dev
->mr_ifc_count
= 0;
864 if (del_timer(&in_dev
->mr_ifc_timer
))
865 __in_dev_put(in_dev
);
866 /* clear deleted report items */
867 igmpv3_clear_delrec(in_dev
);
868 } else if (len
< 12) {
869 return; /* ignore bogus packet; freed by caller */
870 } else if (IGMP_V1_SEEN(in_dev
)) {
871 /* This is a v3 query with v1 queriers present */
872 max_delay
= IGMP_Query_Response_Interval
;
874 } else if (IGMP_V2_SEEN(in_dev
)) {
875 /* this is a v3 query with v2 queriers present;
876 * Interpretation of the max_delay code is problematic here.
877 * A real v2 host would use ih_code directly, while v3 has a
878 * different encoding. We use the v3 encoding as more likely
879 * to be intended in a v3 query.
881 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
883 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
886 ih3
= igmpv3_query_hdr(skb
);
888 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
889 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
891 ih3
= igmpv3_query_hdr(skb
);
894 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
896 max_delay
= 1; /* can't mod w/ 0 */
897 in_dev
->mr_maxdelay
= max_delay
;
899 in_dev
->mr_qrv
= ih3
->qrv
;
900 if (!group
) { /* general query */
902 return; /* no sources allowed */
903 igmp_gq_start_timer(in_dev
);
906 /* mark sources to include, if group & source-specific */
907 mark
= ih3
->nsrcs
!= 0;
911 * - Start the timers in all of our membership records
912 * that the query applies to for the interface on
913 * which the query arrived excl. those that belong
914 * to a "local" group (224.0.0.X)
915 * - For timers already running check if they need to
917 * - Use the igmp->igmp_code field as the maximum
921 for_each_pmc_rcu(in_dev
, im
) {
924 if (group
&& group
!= im
->multiaddr
)
926 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
928 spin_lock_bh(&im
->lock
);
930 im
->gsquery
= im
->gsquery
&& mark
;
933 changed
= !im
->gsquery
||
934 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
935 spin_unlock_bh(&im
->lock
);
937 igmp_mod_timer(im
, max_delay
);
942 /* called in rcu_read_lock() section */
943 int igmp_rcv(struct sk_buff
*skb
)
945 /* This basically follows the spec line by line -- see RFC1112 */
947 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
953 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
956 switch (skb
->ip_summed
) {
957 case CHECKSUM_COMPLETE
:
958 if (!csum_fold(skb
->csum
))
963 if (__skb_checksum_complete(skb
))
969 case IGMP_HOST_MEMBERSHIP_QUERY
:
970 igmp_heard_query(in_dev
, skb
, len
);
972 case IGMP_HOST_MEMBERSHIP_REPORT
:
973 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
974 /* Is it our report looped back? */
975 if (rt_is_output_route(skb_rtable(skb
)))
977 /* don't rely on MC router hearing unicast reports */
978 if (skb
->pkt_type
== PACKET_MULTICAST
||
979 skb
->pkt_type
== PACKET_BROADCAST
)
980 igmp_heard_report(in_dev
, ih
->group
);
983 #ifdef CONFIG_IP_PIMSM_V1
984 return pim_rcv_v1(skb
);
986 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
989 case IGMP_HOST_LEAVE_MESSAGE
:
991 case IGMP_MTRACE_RESP
:
1006 * Add a filter to a device
1009 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1011 char buf
[MAX_ADDR_LEN
];
1012 struct net_device
*dev
= in_dev
->dev
;
1014 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1015 We will get multicast token leakage, when IFF_MULTICAST
1016 is changed. This check should be done in dev->set_multicast_list
1017 routine. Something sort of:
1018 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1021 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1022 dev_mc_add(dev
, buf
);
1026 * Remove a filter from a device
1029 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1031 char buf
[MAX_ADDR_LEN
];
1032 struct net_device
*dev
= in_dev
->dev
;
1034 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1035 dev_mc_del(dev
, buf
);
1038 #ifdef CONFIG_IP_MULTICAST
1040 * deleted ip_mc_list manipulation
1042 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1044 struct ip_mc_list
*pmc
;
1046 /* this is an "ip_mc_list" for convenience; only the fields below
1047 * are actually used. In particular, the refcnt and users are not
1048 * used for management of the delete list. Using the same structure
1049 * for deleted items allows change reports to use common code with
1050 * non-deleted or query-response MCA's.
1052 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1055 spin_lock_bh(&im
->lock
);
1056 pmc
->interface
= im
->interface
;
1057 in_dev_hold(in_dev
);
1058 pmc
->multiaddr
= im
->multiaddr
;
1059 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1060 IGMP_Unsolicited_Report_Count
;
1061 pmc
->sfmode
= im
->sfmode
;
1062 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1063 struct ip_sf_list
*psf
;
1065 pmc
->tomb
= im
->tomb
;
1066 pmc
->sources
= im
->sources
;
1067 im
->tomb
= im
->sources
= NULL
;
1068 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1069 psf
->sf_crcount
= pmc
->crcount
;
1071 spin_unlock_bh(&im
->lock
);
1073 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1074 pmc
->next
= in_dev
->mc_tomb
;
1075 in_dev
->mc_tomb
= pmc
;
1076 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1079 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1081 struct ip_mc_list
*pmc
, *pmc_prev
;
1082 struct ip_sf_list
*psf
, *psf_next
;
1084 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1086 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1087 if (pmc
->multiaddr
== multiaddr
)
1093 pmc_prev
->next
= pmc
->next
;
1095 in_dev
->mc_tomb
= pmc
->next
;
1097 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1099 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1100 psf_next
= psf
->sf_next
;
1103 in_dev_put(pmc
->interface
);
1108 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1110 struct ip_mc_list
*pmc
, *nextpmc
;
1112 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1113 pmc
= in_dev
->mc_tomb
;
1114 in_dev
->mc_tomb
= NULL
;
1115 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1117 for (; pmc
; pmc
= nextpmc
) {
1118 nextpmc
= pmc
->next
;
1119 ip_mc_clear_src(pmc
);
1120 in_dev_put(pmc
->interface
);
1123 /* clear dead sources, too */
1125 for_each_pmc_rcu(in_dev
, pmc
) {
1126 struct ip_sf_list
*psf
, *psf_next
;
1128 spin_lock_bh(&pmc
->lock
);
1131 spin_unlock_bh(&pmc
->lock
);
1132 for (; psf
; psf
=psf_next
) {
1133 psf_next
= psf
->sf_next
;
1141 static void igmp_group_dropped(struct ip_mc_list
*im
)
1143 struct in_device
*in_dev
= im
->interface
;
1144 #ifdef CONFIG_IP_MULTICAST
1150 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1153 #ifdef CONFIG_IP_MULTICAST
1154 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1157 reporter
= im
->reporter
;
1158 igmp_stop_timer(im
);
1160 if (!in_dev
->dead
) {
1161 if (IGMP_V1_SEEN(in_dev
))
1163 if (IGMP_V2_SEEN(in_dev
)) {
1165 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1169 igmpv3_add_delrec(in_dev
, im
);
1171 igmp_ifc_event(in_dev
);
1175 ip_mc_clear_src(im
);
1178 static void igmp_group_added(struct ip_mc_list
*im
)
1180 struct in_device
*in_dev
= im
->interface
;
1182 if (im
->loaded
== 0) {
1184 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1187 #ifdef CONFIG_IP_MULTICAST
1188 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1193 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1194 spin_lock_bh(&im
->lock
);
1195 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1196 spin_unlock_bh(&im
->lock
);
1201 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1202 IGMP_Unsolicited_Report_Count
;
1203 igmp_ifc_event(in_dev
);
1209 * Multicast list managers
1214 * A socket has joined a multicast group on device dev.
1217 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1219 struct ip_mc_list
*im
;
1223 for_each_pmc_rtnl(in_dev
, im
) {
1224 if (im
->multiaddr
== addr
) {
1226 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1231 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1236 im
->interface
= in_dev
;
1237 in_dev_hold(in_dev
);
1238 im
->multiaddr
= addr
;
1239 /* initial mode is (EX, empty) */
1240 im
->sfmode
= MCAST_EXCLUDE
;
1241 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1242 atomic_set(&im
->refcnt
, 1);
1243 spin_lock_init(&im
->lock
);
1244 #ifdef CONFIG_IP_MULTICAST
1245 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1246 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1249 im
->next_rcu
= in_dev
->mc_list
;
1251 rcu_assign_pointer(in_dev
->mc_list
, im
);
1253 #ifdef CONFIG_IP_MULTICAST
1254 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1256 igmp_group_added(im
);
1258 ip_rt_multicast_event(in_dev
);
1262 EXPORT_SYMBOL(ip_mc_inc_group
);
1265 * Resend IGMP JOIN report; used for bonding.
1266 * Called with rcu_read_lock()
1268 void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1270 #ifdef CONFIG_IP_MULTICAST
1271 struct ip_mc_list
*im
;
1274 for_each_pmc_rcu(in_dev
, im
) {
1275 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1278 /* a failover is happening and switches
1279 * must be notified immediately
1281 if (IGMP_V1_SEEN(in_dev
))
1282 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1283 else if (IGMP_V2_SEEN(in_dev
))
1284 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1286 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1287 igmp_send_report(in_dev
, im
, type
);
1291 EXPORT_SYMBOL(ip_mc_rejoin_groups
);
1294 * A socket has left a multicast group on device dev
1297 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1299 struct ip_mc_list
*i
;
1300 struct ip_mc_list __rcu
**ip
;
1304 for (ip
= &in_dev
->mc_list
;
1305 (i
= rtnl_dereference(*ip
)) != NULL
;
1306 ip
= &i
->next_rcu
) {
1307 if (i
->multiaddr
== addr
) {
1308 if (--i
->users
== 0) {
1311 igmp_group_dropped(i
);
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 igmp_group_dropped(i
);
1426 /* RTNL is locked */
1427 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1429 struct net_device
*dev
= NULL
;
1430 struct in_device
*idev
= NULL
;
1432 if (imr
->imr_ifindex
) {
1433 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1436 if (imr
->imr_address
.s_addr
) {
1437 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1443 struct rtable
*rt
= ip_route_output(net
,
1444 imr
->imr_multiaddr
.s_addr
,
1452 imr
->imr_ifindex
= dev
->ifindex
;
1453 idev
= __in_dev_get_rtnl(dev
);
1459 * Join a socket to a group
1461 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1462 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1465 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1468 struct ip_sf_list
*psf
, *psf_prev
;
1472 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1473 if (psf
->sf_inaddr
== *psfsrc
)
1477 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1478 /* source filter not found, or count wrong => bug */
1481 psf
->sf_count
[sfmode
]--;
1482 if (psf
->sf_count
[sfmode
] == 0) {
1483 ip_rt_multicast_event(pmc
->interface
);
1485 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1486 #ifdef CONFIG_IP_MULTICAST
1487 struct in_device
*in_dev
= pmc
->interface
;
1490 /* no more filters for this source */
1492 psf_prev
->sf_next
= psf
->sf_next
;
1494 pmc
->sources
= psf
->sf_next
;
1495 #ifdef CONFIG_IP_MULTICAST
1496 if (psf
->sf_oldin
&&
1497 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1498 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1499 IGMP_Unsolicited_Report_Count
;
1500 psf
->sf_next
= pmc
->tomb
;
1510 #ifndef CONFIG_IP_MULTICAST
1511 #define igmp_ifc_event(x) do { } while (0)
1514 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1515 int sfcount
, __be32
*psfsrc
, int delta
)
1517 struct ip_mc_list
*pmc
;
1524 for_each_pmc_rcu(in_dev
, pmc
) {
1525 if (*pmca
== pmc
->multiaddr
)
1529 /* MCA not found?? bug */
1533 spin_lock_bh(&pmc
->lock
);
1535 #ifdef CONFIG_IP_MULTICAST
1540 if (!pmc
->sfcount
[sfmode
])
1542 pmc
->sfcount
[sfmode
]--;
1545 for (i
=0; i
<sfcount
; i
++) {
1546 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1548 changerec
|= rv
> 0;
1552 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1553 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1554 pmc
->sfcount
[MCAST_INCLUDE
]) {
1555 #ifdef CONFIG_IP_MULTICAST
1556 struct ip_sf_list
*psf
;
1559 /* filter mode change */
1560 pmc
->sfmode
= MCAST_INCLUDE
;
1561 #ifdef CONFIG_IP_MULTICAST
1562 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1563 IGMP_Unsolicited_Report_Count
;
1564 in_dev
->mr_ifc_count
= pmc
->crcount
;
1565 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1566 psf
->sf_crcount
= 0;
1567 igmp_ifc_event(pmc
->interface
);
1568 } else if (sf_setstate(pmc
) || changerec
) {
1569 igmp_ifc_event(pmc
->interface
);
1573 spin_unlock_bh(&pmc
->lock
);
1578 * Add multicast single-source filter to the interface list
1580 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1581 __be32
*psfsrc
, int delta
)
1583 struct ip_sf_list
*psf
, *psf_prev
;
1586 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1587 if (psf
->sf_inaddr
== *psfsrc
)
1592 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1595 psf
->sf_inaddr
= *psfsrc
;
1597 psf_prev
->sf_next
= psf
;
1601 psf
->sf_count
[sfmode
]++;
1602 if (psf
->sf_count
[sfmode
] == 1) {
1603 ip_rt_multicast_event(pmc
->interface
);
1608 #ifdef CONFIG_IP_MULTICAST
1609 static void sf_markstate(struct ip_mc_list
*pmc
)
1611 struct ip_sf_list
*psf
;
1612 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1614 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1615 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1616 psf
->sf_oldin
= mca_xcount
==
1617 psf
->sf_count
[MCAST_EXCLUDE
] &&
1618 !psf
->sf_count
[MCAST_INCLUDE
];
1620 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1623 static int sf_setstate(struct ip_mc_list
*pmc
)
1625 struct ip_sf_list
*psf
, *dpsf
;
1626 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1627 int qrv
= pmc
->interface
->mr_qrv
;
1631 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1632 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1633 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1634 !psf
->sf_count
[MCAST_INCLUDE
];
1636 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1638 if (!psf
->sf_oldin
) {
1639 struct ip_sf_list
*prev
= NULL
;
1641 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1642 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1648 prev
->sf_next
= dpsf
->sf_next
;
1650 pmc
->tomb
= dpsf
->sf_next
;
1653 psf
->sf_crcount
= qrv
;
1656 } else if (psf
->sf_oldin
) {
1658 psf
->sf_crcount
= 0;
1660 * add or update "delete" records if an active filter
1663 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1664 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1667 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1671 /* pmc->lock held by callers */
1672 dpsf
->sf_next
= pmc
->tomb
;
1675 dpsf
->sf_crcount
= qrv
;
1684 * Add multicast source filter list to the interface list
1686 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1687 int sfcount
, __be32
*psfsrc
, int delta
)
1689 struct ip_mc_list
*pmc
;
1696 for_each_pmc_rcu(in_dev
, pmc
) {
1697 if (*pmca
== pmc
->multiaddr
)
1701 /* MCA not found?? bug */
1705 spin_lock_bh(&pmc
->lock
);
1708 #ifdef CONFIG_IP_MULTICAST
1711 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1713 pmc
->sfcount
[sfmode
]++;
1715 for (i
=0; i
<sfcount
; i
++) {
1716 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1723 pmc
->sfcount
[sfmode
]--;
1725 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1726 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1727 #ifdef CONFIG_IP_MULTICAST
1728 struct ip_sf_list
*psf
;
1729 in_dev
= pmc
->interface
;
1732 /* filter mode change */
1733 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1734 pmc
->sfmode
= MCAST_EXCLUDE
;
1735 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1736 pmc
->sfmode
= MCAST_INCLUDE
;
1737 #ifdef CONFIG_IP_MULTICAST
1738 /* else no filters; keep old mode for reports */
1740 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1741 IGMP_Unsolicited_Report_Count
;
1742 in_dev
->mr_ifc_count
= pmc
->crcount
;
1743 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1744 psf
->sf_crcount
= 0;
1745 igmp_ifc_event(in_dev
);
1746 } else if (sf_setstate(pmc
)) {
1747 igmp_ifc_event(in_dev
);
1750 spin_unlock_bh(&pmc
->lock
);
1754 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1756 struct ip_sf_list
*psf
, *nextpsf
;
1758 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1759 nextpsf
= psf
->sf_next
;
1763 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1764 nextpsf
= psf
->sf_next
;
1767 pmc
->sources
= NULL
;
1768 pmc
->sfmode
= MCAST_EXCLUDE
;
1769 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1770 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1775 * Join a multicast group
1777 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1780 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1781 struct ip_mc_socklist
*iml
= NULL
, *i
;
1782 struct in_device
*in_dev
;
1783 struct inet_sock
*inet
= inet_sk(sk
);
1784 struct net
*net
= sock_net(sk
);
1788 if (!ipv4_is_multicast(addr
))
1793 in_dev
= ip_mc_find_dev(net
, imr
);
1802 ifindex
= imr
->imr_ifindex
;
1803 for_each_pmc_rtnl(inet
, i
) {
1804 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1805 i
->multi
.imr_ifindex
== ifindex
)
1810 if (count
>= sysctl_igmp_max_memberships
)
1812 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1816 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1817 iml
->next_rcu
= inet
->mc_list
;
1819 iml
->sfmode
= MCAST_EXCLUDE
;
1820 rcu_assign_pointer(inet
->mc_list
, iml
);
1821 ip_mc_inc_group(in_dev
, addr
);
1827 EXPORT_SYMBOL(ip_mc_join_group
);
1829 static void ip_sf_socklist_reclaim(struct rcu_head
*rp
)
1831 kfree(container_of(rp
, struct ip_sf_socklist
, rcu
));
1832 /* sk_omem_alloc should have been decreased by the caller*/
1835 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1836 struct in_device
*in_dev
)
1838 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1842 /* any-source empty exclude case */
1843 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1844 iml
->sfmode
, 0, NULL
, 0);
1846 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1847 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1848 rcu_assign_pointer(iml
->sflist
, NULL
);
1849 /* decrease mem now to avoid the memleak warning */
1850 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1851 call_rcu(&psf
->rcu
, ip_sf_socklist_reclaim
);
1856 static void ip_mc_socklist_reclaim(struct rcu_head
*rp
)
1858 kfree(container_of(rp
, struct ip_mc_socklist
, rcu
));
1859 /* sk_omem_alloc should have been decreased by the caller*/
1864 * Ask a socket to leave a group.
1867 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1869 struct inet_sock
*inet
= inet_sk(sk
);
1870 struct ip_mc_socklist
*iml
;
1871 struct ip_mc_socklist __rcu
**imlp
;
1872 struct in_device
*in_dev
;
1873 struct net
*net
= sock_net(sk
);
1874 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1876 int ret
= -EADDRNOTAVAIL
;
1879 in_dev
= ip_mc_find_dev(net
, imr
);
1880 ifindex
= imr
->imr_ifindex
;
1881 for (imlp
= &inet
->mc_list
;
1882 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1883 imlp
= &iml
->next_rcu
) {
1884 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1887 if (iml
->multi
.imr_ifindex
!= ifindex
)
1889 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1890 iml
->multi
.imr_address
.s_addr
)
1893 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1895 *imlp
= iml
->next_rcu
;
1898 ip_mc_dec_group(in_dev
, group
);
1900 /* decrease mem now to avoid the memleak warning */
1901 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1902 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
1911 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1912 ip_mreq_source
*mreqs
, int ifindex
)
1915 struct ip_mreqn imr
;
1916 __be32 addr
= mreqs
->imr_multiaddr
;
1917 struct ip_mc_socklist
*pmc
;
1918 struct in_device
*in_dev
= NULL
;
1919 struct inet_sock
*inet
= inet_sk(sk
);
1920 struct ip_sf_socklist
*psl
;
1921 struct net
*net
= sock_net(sk
);
1925 if (!ipv4_is_multicast(addr
))
1930 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1931 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1932 imr
.imr_ifindex
= ifindex
;
1933 in_dev
= ip_mc_find_dev(net
, &imr
);
1939 err
= -EADDRNOTAVAIL
;
1941 for_each_pmc_rtnl(inet
, pmc
) {
1942 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1943 imr
.imr_multiaddr
.s_addr
) &&
1944 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1947 if (!pmc
) { /* must have a prior join */
1951 /* if a source filter was set, must be the same mode as before */
1953 if (pmc
->sfmode
!= omode
) {
1957 } else if (pmc
->sfmode
!= omode
) {
1958 /* allow mode switches for empty-set filters */
1959 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1960 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1962 pmc
->sfmode
= omode
;
1965 psl
= rtnl_dereference(pmc
->sflist
);
1968 goto done
; /* err = -EADDRNOTAVAIL */
1970 for (i
=0; i
<psl
->sl_count
; i
++) {
1971 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1976 if (rv
) /* source not found */
1977 goto done
; /* err = -EADDRNOTAVAIL */
1979 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1980 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1985 /* update the interface filter */
1986 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1987 &mreqs
->imr_sourceaddr
, 1);
1989 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1990 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1995 /* else, add a new source to the filter */
1997 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
2001 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2002 struct ip_sf_socklist
*newpsl
;
2003 int count
= IP_SFBLOCK
;
2006 count
+= psl
->sl_max
;
2007 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2012 newpsl
->sl_max
= count
;
2013 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2015 for (i
=0; i
<psl
->sl_count
; i
++)
2016 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2017 /* decrease mem now to avoid the memleak warning */
2018 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2019 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2021 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2024 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2025 for (i
=0; i
<psl
->sl_count
; i
++) {
2026 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2031 if (rv
== 0) /* address already there is an error */
2033 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2034 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2035 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2038 /* update the interface list */
2039 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2040 &mreqs
->imr_sourceaddr
, 1);
2044 return ip_mc_leave_group(sk
, &imr
);
2048 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2051 struct ip_mreqn imr
;
2052 __be32 addr
= msf
->imsf_multiaddr
;
2053 struct ip_mc_socklist
*pmc
;
2054 struct in_device
*in_dev
;
2055 struct inet_sock
*inet
= inet_sk(sk
);
2056 struct ip_sf_socklist
*newpsl
, *psl
;
2057 struct net
*net
= sock_net(sk
);
2060 if (!ipv4_is_multicast(addr
))
2062 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2063 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2068 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2069 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2070 imr
.imr_ifindex
= ifindex
;
2071 in_dev
= ip_mc_find_dev(net
, &imr
);
2078 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2079 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2084 for_each_pmc_rtnl(inet
, pmc
) {
2085 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2086 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2089 if (!pmc
) { /* must have a prior join */
2093 if (msf
->imsf_numsrc
) {
2094 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2100 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2101 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2102 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2103 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2104 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2106 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2111 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2112 msf
->imsf_fmode
, 0, NULL
, 0);
2114 psl
= rtnl_dereference(pmc
->sflist
);
2116 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2117 psl
->sl_count
, psl
->sl_addr
, 0);
2118 /* decrease mem now to avoid the memleak warning */
2119 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2120 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2122 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2124 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2125 pmc
->sfmode
= msf
->imsf_fmode
;
2130 err
= ip_mc_leave_group(sk
, &imr
);
2134 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2135 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2137 int err
, len
, count
, copycount
;
2138 struct ip_mreqn imr
;
2139 __be32 addr
= msf
->imsf_multiaddr
;
2140 struct ip_mc_socklist
*pmc
;
2141 struct in_device
*in_dev
;
2142 struct inet_sock
*inet
= inet_sk(sk
);
2143 struct ip_sf_socklist
*psl
;
2144 struct net
*net
= sock_net(sk
);
2146 if (!ipv4_is_multicast(addr
))
2151 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2152 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2153 imr
.imr_ifindex
= 0;
2154 in_dev
= ip_mc_find_dev(net
, &imr
);
2160 err
= -EADDRNOTAVAIL
;
2162 for_each_pmc_rtnl(inet
, pmc
) {
2163 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2164 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2167 if (!pmc
) /* must have a prior join */
2169 msf
->imsf_fmode
= pmc
->sfmode
;
2170 psl
= rtnl_dereference(pmc
->sflist
);
2176 count
= psl
->sl_count
;
2178 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2179 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2180 msf
->imsf_numsrc
= count
;
2181 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2182 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2186 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2194 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2195 struct group_filter __user
*optval
, int __user
*optlen
)
2197 int err
, i
, count
, copycount
;
2198 struct sockaddr_in
*psin
;
2200 struct ip_mc_socklist
*pmc
;
2201 struct inet_sock
*inet
= inet_sk(sk
);
2202 struct ip_sf_socklist
*psl
;
2204 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2205 if (psin
->sin_family
!= AF_INET
)
2207 addr
= psin
->sin_addr
.s_addr
;
2208 if (!ipv4_is_multicast(addr
))
2213 err
= -EADDRNOTAVAIL
;
2215 for_each_pmc_rtnl(inet
, pmc
) {
2216 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2217 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2220 if (!pmc
) /* must have a prior join */
2222 gsf
->gf_fmode
= pmc
->sfmode
;
2223 psl
= rtnl_dereference(pmc
->sflist
);
2225 count
= psl
? psl
->sl_count
: 0;
2226 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2227 gsf
->gf_numsrc
= count
;
2228 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2229 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2232 for (i
=0; i
<copycount
; i
++) {
2233 struct sockaddr_storage ss
;
2235 psin
= (struct sockaddr_in
*)&ss
;
2236 memset(&ss
, 0, sizeof(ss
));
2237 psin
->sin_family
= AF_INET
;
2238 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2239 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2249 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2251 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2253 struct inet_sock
*inet
= inet_sk(sk
);
2254 struct ip_mc_socklist
*pmc
;
2255 struct ip_sf_socklist
*psl
;
2260 if (!ipv4_is_multicast(loc_addr
))
2264 for_each_pmc_rcu(inet
, pmc
) {
2265 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2266 pmc
->multi
.imr_ifindex
== dif
)
2272 psl
= rcu_dereference(pmc
->sflist
);
2273 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2277 for (i
=0; i
<psl
->sl_count
; i
++) {
2278 if (psl
->sl_addr
[i
] == rmt_addr
)
2282 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2284 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2294 * A socket is closing.
2297 void ip_mc_drop_socket(struct sock
*sk
)
2299 struct inet_sock
*inet
= inet_sk(sk
);
2300 struct ip_mc_socklist
*iml
;
2301 struct net
*net
= sock_net(sk
);
2303 if (inet
->mc_list
== NULL
)
2307 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2308 struct in_device
*in_dev
;
2310 inet
->mc_list
= iml
->next_rcu
;
2311 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2312 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2314 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2315 /* decrease mem now to avoid the memleak warning */
2316 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2317 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
2322 /* called with rcu_read_lock() */
2323 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2325 struct ip_mc_list
*im
;
2326 struct ip_sf_list
*psf
;
2329 for_each_pmc_rcu(in_dev
, im
) {
2330 if (im
->multiaddr
== mc_addr
)
2333 if (im
&& proto
== IPPROTO_IGMP
) {
2337 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2338 if (psf
->sf_inaddr
== src_addr
)
2342 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2343 psf
->sf_count
[MCAST_EXCLUDE
] !=
2344 im
->sfcount
[MCAST_EXCLUDE
];
2346 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2348 rv
= 1; /* unspecified source; tentatively allow */
2353 #if defined(CONFIG_PROC_FS)
2354 struct igmp_mc_iter_state
{
2355 struct seq_net_private p
;
2356 struct net_device
*dev
;
2357 struct in_device
*in_dev
;
2360 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2362 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2364 struct net
*net
= seq_file_net(seq
);
2365 struct ip_mc_list
*im
= NULL
;
2366 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2368 state
->in_dev
= NULL
;
2369 for_each_netdev_rcu(net
, state
->dev
) {
2370 struct in_device
*in_dev
;
2372 in_dev
= __in_dev_get_rcu(state
->dev
);
2375 im
= rcu_dereference(in_dev
->mc_list
);
2377 state
->in_dev
= in_dev
;
2384 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2386 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2388 im
= rcu_dereference(im
->next_rcu
);
2390 state
->dev
= next_net_device_rcu(state
->dev
);
2392 state
->in_dev
= NULL
;
2395 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2398 im
= rcu_dereference(state
->in_dev
->mc_list
);
2403 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2405 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2407 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2409 return pos
? NULL
: im
;
2412 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2416 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2419 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2421 struct ip_mc_list
*im
;
2422 if (v
== SEQ_START_TOKEN
)
2423 im
= igmp_mc_get_first(seq
);
2425 im
= igmp_mc_get_next(seq
, v
);
2430 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2433 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2435 state
->in_dev
= NULL
;
2440 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2442 if (v
== SEQ_START_TOKEN
)
2444 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2446 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2447 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2449 #ifdef CONFIG_IP_MULTICAST
2450 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2451 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2457 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2458 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2459 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2463 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2464 im
->multiaddr
, im
->users
,
2465 im
->tm_running
, im
->tm_running
?
2466 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2472 static const struct seq_operations igmp_mc_seq_ops
= {
2473 .start
= igmp_mc_seq_start
,
2474 .next
= igmp_mc_seq_next
,
2475 .stop
= igmp_mc_seq_stop
,
2476 .show
= igmp_mc_seq_show
,
2479 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2481 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2482 sizeof(struct igmp_mc_iter_state
));
2485 static const struct file_operations igmp_mc_seq_fops
= {
2486 .owner
= THIS_MODULE
,
2487 .open
= igmp_mc_seq_open
,
2489 .llseek
= seq_lseek
,
2490 .release
= seq_release_net
,
2493 struct igmp_mcf_iter_state
{
2494 struct seq_net_private p
;
2495 struct net_device
*dev
;
2496 struct in_device
*idev
;
2497 struct ip_mc_list
*im
;
2500 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2502 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2504 struct net
*net
= seq_file_net(seq
);
2505 struct ip_sf_list
*psf
= NULL
;
2506 struct ip_mc_list
*im
= NULL
;
2507 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2511 for_each_netdev_rcu(net
, state
->dev
) {
2512 struct in_device
*idev
;
2513 idev
= __in_dev_get_rcu(state
->dev
);
2514 if (unlikely(idev
== NULL
))
2516 im
= rcu_dereference(idev
->mc_list
);
2517 if (likely(im
!= NULL
)) {
2518 spin_lock_bh(&im
->lock
);
2520 if (likely(psf
!= NULL
)) {
2525 spin_unlock_bh(&im
->lock
);
2531 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2533 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2537 spin_unlock_bh(&state
->im
->lock
);
2538 state
->im
= state
->im
->next
;
2539 while (!state
->im
) {
2540 state
->dev
= next_net_device_rcu(state
->dev
);
2545 state
->idev
= __in_dev_get_rcu(state
->dev
);
2548 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2552 spin_lock_bh(&state
->im
->lock
);
2553 psf
= state
->im
->sources
;
2559 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2561 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2563 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2565 return pos
? NULL
: psf
;
2568 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2572 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2575 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2577 struct ip_sf_list
*psf
;
2578 if (v
== SEQ_START_TOKEN
)
2579 psf
= igmp_mcf_get_first(seq
);
2581 psf
= igmp_mcf_get_next(seq
, v
);
2586 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2589 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2590 if (likely(state
->im
!= NULL
)) {
2591 spin_unlock_bh(&state
->im
->lock
);
2599 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2601 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2602 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2604 if (v
== SEQ_START_TOKEN
) {
2607 "%10s %10s %6s %6s\n", "Idx",
2609 "SRC", "INC", "EXC");
2613 "0x%08x %6lu %6lu\n",
2614 state
->dev
->ifindex
, state
->dev
->name
,
2615 ntohl(state
->im
->multiaddr
),
2616 ntohl(psf
->sf_inaddr
),
2617 psf
->sf_count
[MCAST_INCLUDE
],
2618 psf
->sf_count
[MCAST_EXCLUDE
]);
2623 static const struct seq_operations igmp_mcf_seq_ops
= {
2624 .start
= igmp_mcf_seq_start
,
2625 .next
= igmp_mcf_seq_next
,
2626 .stop
= igmp_mcf_seq_stop
,
2627 .show
= igmp_mcf_seq_show
,
2630 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2632 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2633 sizeof(struct igmp_mcf_iter_state
));
2636 static const struct file_operations igmp_mcf_seq_fops
= {
2637 .owner
= THIS_MODULE
,
2638 .open
= igmp_mcf_seq_open
,
2640 .llseek
= seq_lseek
,
2641 .release
= seq_release_net
,
2644 static int __net_init
igmp_net_init(struct net
*net
)
2646 struct proc_dir_entry
*pde
;
2648 pde
= proc_net_fops_create(net
, "igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2651 pde
= proc_net_fops_create(net
, "mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2657 proc_net_remove(net
, "igmp");
2662 static void __net_exit
igmp_net_exit(struct net
*net
)
2664 proc_net_remove(net
, "mcfilter");
2665 proc_net_remove(net
, "igmp");
2668 static struct pernet_operations igmp_net_ops
= {
2669 .init
= igmp_net_init
,
2670 .exit
= igmp_net_exit
,
2673 int __init
igmp_mc_proc_init(void)
2675 return register_pernet_subsys(&igmp_net_ops
);