2 * Linux NET3: Internet Group Management Protocol [IGMP]
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
92 #include <net/net_namespace.h>
95 #include <net/protocol.h>
96 #include <net/route.h>
98 #include <net/checksum.h>
99 #include <linux/netfilter_ipv4.h>
100 #ifdef CONFIG_IP_MROUTE
101 #include <linux/mroute.h>
103 #ifdef CONFIG_PROC_FS
104 #include <linux/proc_fs.h>
105 #include <linux/seq_file.h>
108 #define IP_MAX_MEMBERSHIPS 20
109 #define IP_MAX_MSF 10
111 #ifdef CONFIG_IP_MULTICAST
112 /* Parameter names and values are taken from igmp-v2-06 draft */
114 #define IGMP_V1_Router_Present_Timeout (400*HZ)
115 #define IGMP_V2_Router_Present_Timeout (400*HZ)
116 #define IGMP_Unsolicited_Report_Interval (10*HZ)
117 #define IGMP_Query_Response_Interval (10*HZ)
118 #define IGMP_Unsolicited_Report_Count 2
121 #define IGMP_Initial_Report_Delay (1)
123 /* IGMP_Initial_Report_Delay is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
141 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
142 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
);
143 static void igmpv3_clear_delrec(struct in_device
*in_dev
);
144 static int sf_setstate(struct ip_mc_list
*pmc
);
145 static void sf_markstate(struct ip_mc_list
*pmc
);
147 static void ip_mc_clear_src(struct ip_mc_list
*pmc
);
148 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
149 int sfcount
, __be32
*psfsrc
, int delta
);
151 static void ip_ma_put(struct ip_mc_list
*im
)
153 if (atomic_dec_and_test(&im
->refcnt
)) {
154 in_dev_put(im
->interface
);
159 #define for_each_pmc_rcu(in_dev, pmc) \
160 for (pmc = rcu_dereference(in_dev->mc_list); \
162 pmc = rcu_dereference(pmc->next_rcu))
164 #define for_each_pmc_rtnl(in_dev, pmc) \
165 for (pmc = rtnl_dereference(in_dev->mc_list); \
167 pmc = rtnl_dereference(pmc->next_rcu))
169 #ifdef CONFIG_IP_MULTICAST
175 static void igmp_stop_timer(struct ip_mc_list
*im
)
177 spin_lock_bh(&im
->lock
);
178 if (del_timer(&im
->timer
))
179 atomic_dec(&im
->refcnt
);
182 im
->unsolicit_count
= 0;
183 spin_unlock_bh(&im
->lock
);
186 /* It must be called with locked im->lock */
187 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
189 int tv
= net_random() % max_delay
;
192 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
193 atomic_inc(&im
->refcnt
);
196 static void igmp_gq_start_timer(struct in_device
*in_dev
)
198 int tv
= net_random() % in_dev
->mr_maxdelay
;
199 unsigned long exp
= jiffies
+ tv
+ 2;
201 if (in_dev
->mr_gq_running
&&
202 time_after_eq(exp
, (in_dev
->mr_gq_timer
).expires
))
205 in_dev
->mr_gq_running
= 1;
206 if (!mod_timer(&in_dev
->mr_gq_timer
, exp
))
210 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
212 int tv
= net_random() % delay
;
214 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
218 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
220 spin_lock_bh(&im
->lock
);
221 im
->unsolicit_count
= 0;
222 if (del_timer(&im
->timer
)) {
223 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
224 add_timer(&im
->timer
);
226 spin_unlock_bh(&im
->lock
);
229 atomic_dec(&im
->refcnt
);
231 igmp_start_timer(im
, max_delay
);
232 spin_unlock_bh(&im
->lock
);
237 * Send an IGMP report.
240 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
243 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
244 int gdeleted
, int sdeleted
)
247 case IGMPV3_MODE_IS_INCLUDE
:
248 case IGMPV3_MODE_IS_EXCLUDE
:
249 if (gdeleted
|| sdeleted
)
251 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
252 if (pmc
->sfmode
== MCAST_INCLUDE
)
254 /* don't include if this source is excluded
257 if (psf
->sf_count
[MCAST_INCLUDE
])
258 return type
== IGMPV3_MODE_IS_INCLUDE
;
259 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
260 psf
->sf_count
[MCAST_EXCLUDE
];
263 case IGMPV3_CHANGE_TO_INCLUDE
:
264 if (gdeleted
|| sdeleted
)
266 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
267 case IGMPV3_CHANGE_TO_EXCLUDE
:
268 if (gdeleted
|| sdeleted
)
270 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
271 psf
->sf_count
[MCAST_INCLUDE
])
273 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
274 psf
->sf_count
[MCAST_EXCLUDE
];
275 case IGMPV3_ALLOW_NEW_SOURCES
:
276 if (gdeleted
|| !psf
->sf_crcount
)
278 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
279 case IGMPV3_BLOCK_OLD_SOURCES
:
280 if (pmc
->sfmode
== MCAST_INCLUDE
)
281 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
282 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
288 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
290 struct ip_sf_list
*psf
;
293 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
294 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
301 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
303 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
308 struct igmpv3_report
*pig
;
309 struct net
*net
= dev_net(dev
);
311 int hlen
= LL_RESERVED_SPACE(dev
);
312 int tlen
= dev
->needed_tailroom
;
315 skb
= alloc_skb(size
+ hlen
+ tlen
,
316 GFP_ATOMIC
| __GFP_NOWARN
);
323 igmp_skb_size(skb
) = size
;
325 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
327 IPPROTO_IGMP
, 0, dev
->ifindex
);
333 skb_dst_set(skb
, &rt
->dst
);
336 skb_reserve(skb
, hlen
);
338 skb_reset_network_header(skb
);
340 skb_put(skb
, sizeof(struct iphdr
) + 4);
343 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
345 pip
->frag_off
= htons(IP_DF
);
347 pip
->daddr
= fl4
.daddr
;
348 pip
->saddr
= fl4
.saddr
;
349 pip
->protocol
= IPPROTO_IGMP
;
350 pip
->tot_len
= 0; /* filled in later */
351 ip_select_ident(skb
, NULL
);
352 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
353 ((u8
*)&pip
[1])[1] = 4;
354 ((u8
*)&pip
[1])[2] = 0;
355 ((u8
*)&pip
[1])[3] = 0;
357 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
358 skb_put(skb
, sizeof(*pig
));
359 pig
= igmpv3_report_hdr(skb
);
360 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
368 static int igmpv3_sendpack(struct sk_buff
*skb
)
370 struct igmphdr
*pig
= igmp_hdr(skb
);
371 const int igmplen
= skb
->tail
- skb
->transport_header
;
373 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
375 return ip_local_out(skb
);
378 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
380 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
383 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
384 int type
, struct igmpv3_grec
**ppgr
)
386 struct net_device
*dev
= pmc
->interface
->dev
;
387 struct igmpv3_report
*pih
;
388 struct igmpv3_grec
*pgr
;
391 skb
= igmpv3_newpack(dev
, dev
->mtu
);
394 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
395 pgr
->grec_type
= type
;
396 pgr
->grec_auxwords
= 0;
398 pgr
->grec_mca
= pmc
->multiaddr
;
399 pih
= igmpv3_report_hdr(skb
);
400 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
405 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
406 skb_tailroom(skb)) : 0)
408 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
409 int type
, int gdeleted
, int sdeleted
)
411 struct net_device
*dev
= pmc
->interface
->dev
;
412 struct igmpv3_report
*pih
;
413 struct igmpv3_grec
*pgr
= NULL
;
414 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
415 int scount
, stotal
, first
, isquery
, truncate
;
417 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
420 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
421 type
== IGMPV3_MODE_IS_EXCLUDE
;
422 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
423 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
427 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
432 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
434 /* EX and TO_EX get a fresh packet, if needed */
436 if (pih
&& pih
->ngrec
&&
437 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
439 igmpv3_sendpack(skb
);
440 skb
= igmpv3_newpack(dev
, dev
->mtu
);
445 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
448 psf_next
= psf
->sf_next
;
450 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
455 /* clear marks on query responses */
459 if (AVAILABLE(skb
) < sizeof(__be32
) +
460 first
*sizeof(struct igmpv3_grec
)) {
461 if (truncate
&& !first
)
462 break; /* truncate these */
464 pgr
->grec_nsrcs
= htons(scount
);
466 igmpv3_sendpack(skb
);
467 skb
= igmpv3_newpack(dev
, dev
->mtu
);
472 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
477 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
478 *psrc
= psf
->sf_inaddr
;
480 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
481 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
483 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
485 psf_prev
->sf_next
= psf
->sf_next
;
487 *psf_list
= psf
->sf_next
;
497 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
498 type
== IGMPV3_BLOCK_OLD_SOURCES
)
500 if (pmc
->crcount
|| isquery
) {
501 /* make sure we have room for group header */
502 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
503 igmpv3_sendpack(skb
);
504 skb
= NULL
; /* add_grhead will get a new one */
506 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
510 pgr
->grec_nsrcs
= htons(scount
);
513 pmc
->gsquery
= 0; /* clear query state on report */
517 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
519 struct sk_buff
*skb
= NULL
;
524 for_each_pmc_rcu(in_dev
, pmc
) {
525 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
527 spin_lock_bh(&pmc
->lock
);
528 if (pmc
->sfcount
[MCAST_EXCLUDE
])
529 type
= IGMPV3_MODE_IS_EXCLUDE
;
531 type
= IGMPV3_MODE_IS_INCLUDE
;
532 skb
= add_grec(skb
, pmc
, type
, 0, 0);
533 spin_unlock_bh(&pmc
->lock
);
537 spin_lock_bh(&pmc
->lock
);
538 if (pmc
->sfcount
[MCAST_EXCLUDE
])
539 type
= IGMPV3_MODE_IS_EXCLUDE
;
541 type
= IGMPV3_MODE_IS_INCLUDE
;
542 skb
= add_grec(skb
, pmc
, type
, 0, 0);
543 spin_unlock_bh(&pmc
->lock
);
547 return igmpv3_sendpack(skb
);
551 * remove zero-count source records from a source filter list
553 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
555 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
558 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
559 psf_next
= psf
->sf_next
;
560 if (psf
->sf_crcount
== 0) {
562 psf_prev
->sf_next
= psf
->sf_next
;
564 *ppsf
= psf
->sf_next
;
571 static void igmpv3_send_cr(struct in_device
*in_dev
)
573 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
574 struct sk_buff
*skb
= NULL
;
578 spin_lock_bh(&in_dev
->mc_tomb_lock
);
582 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
583 pmc_next
= pmc
->next
;
584 if (pmc
->sfmode
== MCAST_INCLUDE
) {
585 type
= IGMPV3_BLOCK_OLD_SOURCES
;
586 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
587 skb
= add_grec(skb
, pmc
, type
, 1, 0);
588 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
591 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
592 type
= IGMPV3_CHANGE_TO_INCLUDE
;
593 skb
= add_grec(skb
, pmc
, type
, 1, 0);
596 if (pmc
->crcount
== 0) {
597 igmpv3_clear_zeros(&pmc
->tomb
);
598 igmpv3_clear_zeros(&pmc
->sources
);
601 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
603 pmc_prev
->next
= pmc_next
;
605 in_dev
->mc_tomb
= pmc_next
;
606 in_dev_put(pmc
->interface
);
611 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
614 for_each_pmc_rcu(in_dev
, pmc
) {
615 spin_lock_bh(&pmc
->lock
);
616 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
617 type
= IGMPV3_BLOCK_OLD_SOURCES
;
618 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
620 type
= IGMPV3_ALLOW_NEW_SOURCES
;
621 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
623 skb
= add_grec(skb
, pmc
, type
, 0, 0);
624 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
626 /* filter mode changes */
628 if (pmc
->sfmode
== MCAST_EXCLUDE
)
629 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
631 type
= IGMPV3_CHANGE_TO_INCLUDE
;
632 skb
= add_grec(skb
, pmc
, type
, 0, 0);
635 spin_unlock_bh(&pmc
->lock
);
641 (void) igmpv3_sendpack(skb
);
644 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
651 struct net_device
*dev
= in_dev
->dev
;
652 struct net
*net
= dev_net(dev
);
653 __be32 group
= pmc
? pmc
->multiaddr
: 0;
658 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
659 return igmpv3_send_report(in_dev
, pmc
);
660 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
661 dst
= IGMP_ALL_ROUTER
;
665 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
667 IPPROTO_IGMP
, 0, dev
->ifindex
);
671 hlen
= LL_RESERVED_SPACE(dev
);
672 tlen
= dev
->needed_tailroom
;
673 skb
= alloc_skb(IGMP_SIZE
+ hlen
+ tlen
, GFP_ATOMIC
);
679 skb_dst_set(skb
, &rt
->dst
);
681 skb_reserve(skb
, hlen
);
683 skb_reset_network_header(skb
);
685 skb_put(skb
, sizeof(struct iphdr
) + 4);
688 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
690 iph
->frag_off
= htons(IP_DF
);
693 iph
->saddr
= fl4
.saddr
;
694 iph
->protocol
= IPPROTO_IGMP
;
695 ip_select_ident(skb
, NULL
);
696 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
697 ((u8
*)&iph
[1])[1] = 4;
698 ((u8
*)&iph
[1])[2] = 0;
699 ((u8
*)&iph
[1])[3] = 0;
701 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
706 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
708 return ip_local_out(skb
);
711 static void igmp_gq_timer_expire(unsigned long data
)
713 struct in_device
*in_dev
= (struct in_device
*)data
;
715 in_dev
->mr_gq_running
= 0;
716 igmpv3_send_report(in_dev
, NULL
);
720 static void igmp_ifc_timer_expire(unsigned long data
)
722 struct in_device
*in_dev
= (struct in_device
*)data
;
724 igmpv3_send_cr(in_dev
);
725 if (in_dev
->mr_ifc_count
) {
726 in_dev
->mr_ifc_count
--;
727 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
732 static void igmp_ifc_event(struct in_device
*in_dev
)
734 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
736 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
737 IGMP_Unsolicited_Report_Count
;
738 igmp_ifc_start_timer(in_dev
, 1);
742 static void igmp_timer_expire(unsigned long data
)
744 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
745 struct in_device
*in_dev
= im
->interface
;
747 spin_lock(&im
->lock
);
750 if (im
->unsolicit_count
) {
751 im
->unsolicit_count
--;
752 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
755 spin_unlock(&im
->lock
);
757 if (IGMP_V1_SEEN(in_dev
))
758 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
759 else if (IGMP_V2_SEEN(in_dev
))
760 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
762 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
767 /* mark EXCLUDE-mode sources */
768 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
770 struct ip_sf_list
*psf
;
774 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
777 for (i
=0; i
<nsrcs
; i
++) {
778 /* skip inactive filters */
779 if (psf
->sf_count
[MCAST_INCLUDE
] ||
780 pmc
->sfcount
[MCAST_EXCLUDE
] !=
781 psf
->sf_count
[MCAST_EXCLUDE
])
783 if (srcs
[i
] == psf
->sf_inaddr
) {
790 if (scount
== nsrcs
) /* all sources excluded */
795 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
797 struct ip_sf_list
*psf
;
800 if (pmc
->sfmode
== MCAST_EXCLUDE
)
801 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
803 /* mark INCLUDE-mode sources */
805 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
808 for (i
=0; i
<nsrcs
; i
++)
809 if (srcs
[i
] == psf
->sf_inaddr
) {
823 /* return true if packet was dropped */
824 static bool igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
826 struct ip_mc_list
*im
;
828 /* Timers are only set for non-local groups */
830 if (group
== IGMP_ALL_HOSTS
)
834 for_each_pmc_rcu(in_dev
, im
) {
835 if (im
->multiaddr
== group
) {
844 /* return true if packet was dropped */
845 static bool igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
848 struct igmphdr
*ih
= igmp_hdr(skb
);
849 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
850 struct ip_mc_list
*im
;
851 __be32 group
= ih
->group
;
858 /* Alas, old v1 router presents here. */
860 max_delay
= IGMP_Query_Response_Interval
;
861 in_dev
->mr_v1_seen
= jiffies
+
862 IGMP_V1_Router_Present_Timeout
;
865 /* v2 router present */
866 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
867 in_dev
->mr_v2_seen
= jiffies
+
868 IGMP_V2_Router_Present_Timeout
;
870 /* cancel the interface change timer */
871 in_dev
->mr_ifc_count
= 0;
872 if (del_timer(&in_dev
->mr_ifc_timer
))
873 __in_dev_put(in_dev
);
874 /* clear deleted report items */
875 igmpv3_clear_delrec(in_dev
);
876 } else if (len
< 12) {
877 return true; /* ignore bogus packet; freed by caller */
878 } else if (IGMP_V1_SEEN(in_dev
)) {
879 /* This is a v3 query with v1 queriers present */
880 max_delay
= IGMP_Query_Response_Interval
;
882 } else if (IGMP_V2_SEEN(in_dev
)) {
883 /* this is a v3 query with v2 queriers present;
884 * Interpretation of the max_delay code is problematic here.
885 * A real v2 host would use ih_code directly, while v3 has a
886 * different encoding. We use the v3 encoding as more likely
887 * to be intended in a v3 query.
889 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
891 max_delay
= 1; /* can't mod w/ 0 */
893 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
896 ih3
= igmpv3_query_hdr(skb
);
898 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
899 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
901 ih3
= igmpv3_query_hdr(skb
);
904 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
906 max_delay
= 1; /* can't mod w/ 0 */
907 in_dev
->mr_maxdelay
= max_delay
;
909 in_dev
->mr_qrv
= ih3
->qrv
;
910 if (!group
) { /* general query */
912 return false; /* no sources allowed */
913 igmp_gq_start_timer(in_dev
);
916 /* mark sources to include, if group & source-specific */
917 mark
= ih3
->nsrcs
!= 0;
921 * - Start the timers in all of our membership records
922 * that the query applies to for the interface on
923 * which the query arrived excl. those that belong
924 * to a "local" group (224.0.0.X)
925 * - For timers already running check if they need to
927 * - Use the igmp->igmp_code field as the maximum
931 for_each_pmc_rcu(in_dev
, im
) {
934 if (group
&& group
!= im
->multiaddr
)
936 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
938 spin_lock_bh(&im
->lock
);
940 im
->gsquery
= im
->gsquery
&& mark
;
943 changed
= !im
->gsquery
||
944 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
945 spin_unlock_bh(&im
->lock
);
947 igmp_mod_timer(im
, max_delay
);
953 /* called in rcu_read_lock() section */
954 int igmp_rcv(struct sk_buff
*skb
)
956 /* This basically follows the spec line by line -- see RFC1112 */
958 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
965 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
968 switch (skb
->ip_summed
) {
969 case CHECKSUM_COMPLETE
:
970 if (!csum_fold(skb
->csum
))
975 if (__skb_checksum_complete(skb
))
981 case IGMP_HOST_MEMBERSHIP_QUERY
:
982 dropped
= igmp_heard_query(in_dev
, skb
, len
);
984 case IGMP_HOST_MEMBERSHIP_REPORT
:
985 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
986 /* Is it our report looped back? */
987 if (rt_is_output_route(skb_rtable(skb
)))
989 /* don't rely on MC router hearing unicast reports */
990 if (skb
->pkt_type
== PACKET_MULTICAST
||
991 skb
->pkt_type
== PACKET_BROADCAST
)
992 dropped
= igmp_heard_report(in_dev
, ih
->group
);
995 #ifdef CONFIG_IP_PIMSM_V1
996 return pim_rcv_v1(skb
);
998 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1001 case IGMP_HOST_LEAVE_MESSAGE
:
1003 case IGMP_MTRACE_RESP
:
1021 * Add a filter to a device
1024 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1026 char buf
[MAX_ADDR_LEN
];
1027 struct net_device
*dev
= in_dev
->dev
;
1029 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1030 We will get multicast token leakage, when IFF_MULTICAST
1031 is changed. This check should be done in ndo_set_rx_mode
1032 routine. Something sort of:
1033 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1036 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1037 dev_mc_add(dev
, buf
);
1041 * Remove a filter from a device
1044 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1046 char buf
[MAX_ADDR_LEN
];
1047 struct net_device
*dev
= in_dev
->dev
;
1049 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1050 dev_mc_del(dev
, buf
);
1053 #ifdef CONFIG_IP_MULTICAST
1055 * deleted ip_mc_list manipulation
1057 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1059 struct ip_mc_list
*pmc
;
1061 /* this is an "ip_mc_list" for convenience; only the fields below
1062 * are actually used. In particular, the refcnt and users are not
1063 * used for management of the delete list. Using the same structure
1064 * for deleted items allows change reports to use common code with
1065 * non-deleted or query-response MCA's.
1067 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1070 spin_lock_bh(&im
->lock
);
1071 pmc
->interface
= im
->interface
;
1072 in_dev_hold(in_dev
);
1073 pmc
->multiaddr
= im
->multiaddr
;
1074 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1075 IGMP_Unsolicited_Report_Count
;
1076 pmc
->sfmode
= im
->sfmode
;
1077 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1078 struct ip_sf_list
*psf
;
1080 pmc
->tomb
= im
->tomb
;
1081 pmc
->sources
= im
->sources
;
1082 im
->tomb
= im
->sources
= NULL
;
1083 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1084 psf
->sf_crcount
= pmc
->crcount
;
1086 spin_unlock_bh(&im
->lock
);
1088 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1089 pmc
->next
= in_dev
->mc_tomb
;
1090 in_dev
->mc_tomb
= pmc
;
1091 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1094 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1096 struct ip_mc_list
*pmc
, *pmc_prev
;
1097 struct ip_sf_list
*psf
, *psf_next
;
1099 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1101 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1102 if (pmc
->multiaddr
== multiaddr
)
1108 pmc_prev
->next
= pmc
->next
;
1110 in_dev
->mc_tomb
= pmc
->next
;
1112 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1114 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1115 psf_next
= psf
->sf_next
;
1118 in_dev_put(pmc
->interface
);
1123 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1125 struct ip_mc_list
*pmc
, *nextpmc
;
1127 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1128 pmc
= in_dev
->mc_tomb
;
1129 in_dev
->mc_tomb
= NULL
;
1130 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1132 for (; pmc
; pmc
= nextpmc
) {
1133 nextpmc
= pmc
->next
;
1134 ip_mc_clear_src(pmc
);
1135 in_dev_put(pmc
->interface
);
1138 /* clear dead sources, too */
1140 for_each_pmc_rcu(in_dev
, pmc
) {
1141 struct ip_sf_list
*psf
, *psf_next
;
1143 spin_lock_bh(&pmc
->lock
);
1146 spin_unlock_bh(&pmc
->lock
);
1147 for (; psf
; psf
=psf_next
) {
1148 psf_next
= psf
->sf_next
;
1156 static void igmp_group_dropped(struct ip_mc_list
*im
)
1158 struct in_device
*in_dev
= im
->interface
;
1159 #ifdef CONFIG_IP_MULTICAST
1165 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1168 #ifdef CONFIG_IP_MULTICAST
1169 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1172 reporter
= im
->reporter
;
1173 igmp_stop_timer(im
);
1175 if (!in_dev
->dead
) {
1176 if (IGMP_V1_SEEN(in_dev
))
1178 if (IGMP_V2_SEEN(in_dev
)) {
1180 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1184 igmpv3_add_delrec(in_dev
, im
);
1186 igmp_ifc_event(in_dev
);
1191 static void igmp_group_added(struct ip_mc_list
*im
)
1193 struct in_device
*in_dev
= im
->interface
;
1195 if (im
->loaded
== 0) {
1197 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1200 #ifdef CONFIG_IP_MULTICAST
1201 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1206 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1207 spin_lock_bh(&im
->lock
);
1208 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1209 spin_unlock_bh(&im
->lock
);
1214 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1215 IGMP_Unsolicited_Report_Count
;
1216 igmp_ifc_event(in_dev
);
1222 * Multicast list managers
1227 * A socket has joined a multicast group on device dev.
1230 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1232 struct ip_mc_list
*im
;
1236 for_each_pmc_rtnl(in_dev
, im
) {
1237 if (im
->multiaddr
== addr
) {
1239 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1244 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1249 im
->interface
= in_dev
;
1250 in_dev_hold(in_dev
);
1251 im
->multiaddr
= addr
;
1252 /* initial mode is (EX, empty) */
1253 im
->sfmode
= MCAST_EXCLUDE
;
1254 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1255 atomic_set(&im
->refcnt
, 1);
1256 spin_lock_init(&im
->lock
);
1257 #ifdef CONFIG_IP_MULTICAST
1258 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1259 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1262 im
->next_rcu
= in_dev
->mc_list
;
1264 rcu_assign_pointer(in_dev
->mc_list
, im
);
1266 #ifdef CONFIG_IP_MULTICAST
1267 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1269 igmp_group_added(im
);
1271 ip_rt_multicast_event(in_dev
);
1275 EXPORT_SYMBOL(ip_mc_inc_group
);
1278 * Resend IGMP JOIN report; used for bonding.
1279 * Called with rcu_read_lock()
1281 void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1283 #ifdef CONFIG_IP_MULTICAST
1284 struct ip_mc_list
*im
;
1287 for_each_pmc_rcu(in_dev
, im
) {
1288 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1291 /* a failover is happening and switches
1292 * must be notified immediately
1294 if (IGMP_V1_SEEN(in_dev
))
1295 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1296 else if (IGMP_V2_SEEN(in_dev
))
1297 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1299 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1300 igmp_send_report(in_dev
, im
, type
);
1304 EXPORT_SYMBOL(ip_mc_rejoin_groups
);
1307 * A socket has left a multicast group on device dev
1310 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1312 struct ip_mc_list
*i
;
1313 struct ip_mc_list __rcu
**ip
;
1317 for (ip
= &in_dev
->mc_list
;
1318 (i
= rtnl_dereference(*ip
)) != NULL
;
1319 ip
= &i
->next_rcu
) {
1320 if (i
->multiaddr
== addr
) {
1321 if (--i
->users
== 0) {
1324 igmp_group_dropped(i
);
1328 ip_rt_multicast_event(in_dev
);
1337 EXPORT_SYMBOL(ip_mc_dec_group
);
1339 /* Device changing type */
1341 void ip_mc_unmap(struct in_device
*in_dev
)
1343 struct ip_mc_list
*pmc
;
1347 for_each_pmc_rtnl(in_dev
, pmc
)
1348 igmp_group_dropped(pmc
);
1351 void ip_mc_remap(struct in_device
*in_dev
)
1353 struct ip_mc_list
*pmc
;
1357 for_each_pmc_rtnl(in_dev
, pmc
)
1358 igmp_group_added(pmc
);
1361 /* Device going down */
1363 void ip_mc_down(struct in_device
*in_dev
)
1365 struct ip_mc_list
*pmc
;
1369 for_each_pmc_rtnl(in_dev
, pmc
)
1370 igmp_group_dropped(pmc
);
1372 #ifdef CONFIG_IP_MULTICAST
1373 in_dev
->mr_ifc_count
= 0;
1374 if (del_timer(&in_dev
->mr_ifc_timer
))
1375 __in_dev_put(in_dev
);
1376 in_dev
->mr_gq_running
= 0;
1377 if (del_timer(&in_dev
->mr_gq_timer
))
1378 __in_dev_put(in_dev
);
1379 igmpv3_clear_delrec(in_dev
);
1382 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1385 void ip_mc_init_dev(struct in_device
*in_dev
)
1389 in_dev
->mc_tomb
= NULL
;
1390 #ifdef CONFIG_IP_MULTICAST
1391 in_dev
->mr_gq_running
= 0;
1392 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1393 (unsigned long)in_dev
);
1394 in_dev
->mr_ifc_count
= 0;
1395 in_dev
->mc_count
= 0;
1396 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1397 (unsigned long)in_dev
);
1398 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1401 spin_lock_init(&in_dev
->mc_tomb_lock
);
1404 /* Device going up */
1406 void ip_mc_up(struct in_device
*in_dev
)
1408 struct ip_mc_list
*pmc
;
1412 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1414 for_each_pmc_rtnl(in_dev
, pmc
)
1415 igmp_group_added(pmc
);
1419 * Device is about to be destroyed: clean up.
1422 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1424 struct ip_mc_list
*i
;
1428 /* Deactivate timers */
1431 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1432 in_dev
->mc_list
= i
->next_rcu
;
1435 /* We've dropped the groups in ip_mc_down already */
1441 /* RTNL is locked */
1442 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1444 struct net_device
*dev
= NULL
;
1445 struct in_device
*idev
= NULL
;
1447 if (imr
->imr_ifindex
) {
1448 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1451 if (imr
->imr_address
.s_addr
) {
1452 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1458 struct rtable
*rt
= ip_route_output(net
,
1459 imr
->imr_multiaddr
.s_addr
,
1467 imr
->imr_ifindex
= dev
->ifindex
;
1468 idev
= __in_dev_get_rtnl(dev
);
1474 * Join a socket to a group
1476 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1477 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1480 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1483 struct ip_sf_list
*psf
, *psf_prev
;
1487 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1488 if (psf
->sf_inaddr
== *psfsrc
)
1492 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1493 /* source filter not found, or count wrong => bug */
1496 psf
->sf_count
[sfmode
]--;
1497 if (psf
->sf_count
[sfmode
] == 0) {
1498 ip_rt_multicast_event(pmc
->interface
);
1500 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1501 #ifdef CONFIG_IP_MULTICAST
1502 struct in_device
*in_dev
= pmc
->interface
;
1505 /* no more filters for this source */
1507 psf_prev
->sf_next
= psf
->sf_next
;
1509 pmc
->sources
= psf
->sf_next
;
1510 #ifdef CONFIG_IP_MULTICAST
1511 if (psf
->sf_oldin
&&
1512 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1513 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1514 IGMP_Unsolicited_Report_Count
;
1515 psf
->sf_next
= pmc
->tomb
;
1525 #ifndef CONFIG_IP_MULTICAST
1526 #define igmp_ifc_event(x) do { } while (0)
1529 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1530 int sfcount
, __be32
*psfsrc
, int delta
)
1532 struct ip_mc_list
*pmc
;
1539 for_each_pmc_rcu(in_dev
, pmc
) {
1540 if (*pmca
== pmc
->multiaddr
)
1544 /* MCA not found?? bug */
1548 spin_lock_bh(&pmc
->lock
);
1550 #ifdef CONFIG_IP_MULTICAST
1555 if (!pmc
->sfcount
[sfmode
])
1557 pmc
->sfcount
[sfmode
]--;
1560 for (i
=0; i
<sfcount
; i
++) {
1561 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1563 changerec
|= rv
> 0;
1567 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1568 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1569 pmc
->sfcount
[MCAST_INCLUDE
]) {
1570 #ifdef CONFIG_IP_MULTICAST
1571 struct ip_sf_list
*psf
;
1574 /* filter mode change */
1575 pmc
->sfmode
= MCAST_INCLUDE
;
1576 #ifdef CONFIG_IP_MULTICAST
1577 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1578 IGMP_Unsolicited_Report_Count
;
1579 in_dev
->mr_ifc_count
= pmc
->crcount
;
1580 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1581 psf
->sf_crcount
= 0;
1582 igmp_ifc_event(pmc
->interface
);
1583 } else if (sf_setstate(pmc
) || changerec
) {
1584 igmp_ifc_event(pmc
->interface
);
1588 spin_unlock_bh(&pmc
->lock
);
1593 * Add multicast single-source filter to the interface list
1595 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1598 struct ip_sf_list
*psf
, *psf_prev
;
1601 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1602 if (psf
->sf_inaddr
== *psfsrc
)
1607 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1610 psf
->sf_inaddr
= *psfsrc
;
1612 psf_prev
->sf_next
= psf
;
1616 psf
->sf_count
[sfmode
]++;
1617 if (psf
->sf_count
[sfmode
] == 1) {
1618 ip_rt_multicast_event(pmc
->interface
);
1623 #ifdef CONFIG_IP_MULTICAST
1624 static void sf_markstate(struct ip_mc_list
*pmc
)
1626 struct ip_sf_list
*psf
;
1627 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1629 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1630 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1631 psf
->sf_oldin
= mca_xcount
==
1632 psf
->sf_count
[MCAST_EXCLUDE
] &&
1633 !psf
->sf_count
[MCAST_INCLUDE
];
1635 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1638 static int sf_setstate(struct ip_mc_list
*pmc
)
1640 struct ip_sf_list
*psf
, *dpsf
;
1641 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1642 int qrv
= pmc
->interface
->mr_qrv
;
1646 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1647 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1648 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1649 !psf
->sf_count
[MCAST_INCLUDE
];
1651 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1653 if (!psf
->sf_oldin
) {
1654 struct ip_sf_list
*prev
= NULL
;
1656 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1657 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1663 prev
->sf_next
= dpsf
->sf_next
;
1665 pmc
->tomb
= dpsf
->sf_next
;
1668 psf
->sf_crcount
= qrv
;
1671 } else if (psf
->sf_oldin
) {
1673 psf
->sf_crcount
= 0;
1675 * add or update "delete" records if an active filter
1678 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1679 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1682 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1686 /* pmc->lock held by callers */
1687 dpsf
->sf_next
= pmc
->tomb
;
1690 dpsf
->sf_crcount
= qrv
;
1699 * Add multicast source filter list to the interface list
1701 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1702 int sfcount
, __be32
*psfsrc
, int delta
)
1704 struct ip_mc_list
*pmc
;
1711 for_each_pmc_rcu(in_dev
, pmc
) {
1712 if (*pmca
== pmc
->multiaddr
)
1716 /* MCA not found?? bug */
1720 spin_lock_bh(&pmc
->lock
);
1723 #ifdef CONFIG_IP_MULTICAST
1726 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1728 pmc
->sfcount
[sfmode
]++;
1730 for (i
=0; i
<sfcount
; i
++) {
1731 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
1739 pmc
->sfcount
[sfmode
]--;
1741 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
1742 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1743 #ifdef CONFIG_IP_MULTICAST
1744 struct ip_sf_list
*psf
;
1745 in_dev
= pmc
->interface
;
1748 /* filter mode change */
1749 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1750 pmc
->sfmode
= MCAST_EXCLUDE
;
1751 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1752 pmc
->sfmode
= MCAST_INCLUDE
;
1753 #ifdef CONFIG_IP_MULTICAST
1754 /* else no filters; keep old mode for reports */
1756 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1757 IGMP_Unsolicited_Report_Count
;
1758 in_dev
->mr_ifc_count
= pmc
->crcount
;
1759 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1760 psf
->sf_crcount
= 0;
1761 igmp_ifc_event(in_dev
);
1762 } else if (sf_setstate(pmc
)) {
1763 igmp_ifc_event(in_dev
);
1766 spin_unlock_bh(&pmc
->lock
);
1770 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1772 struct ip_sf_list
*psf
, *nextpsf
;
1774 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1775 nextpsf
= psf
->sf_next
;
1779 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1780 nextpsf
= psf
->sf_next
;
1783 pmc
->sources
= NULL
;
1784 pmc
->sfmode
= MCAST_EXCLUDE
;
1785 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1786 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1791 * Join a multicast group
1793 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1796 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1797 struct ip_mc_socklist
*iml
= NULL
, *i
;
1798 struct in_device
*in_dev
;
1799 struct inet_sock
*inet
= inet_sk(sk
);
1800 struct net
*net
= sock_net(sk
);
1804 if (!ipv4_is_multicast(addr
))
1809 in_dev
= ip_mc_find_dev(net
, imr
);
1818 ifindex
= imr
->imr_ifindex
;
1819 for_each_pmc_rtnl(inet
, i
) {
1820 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1821 i
->multi
.imr_ifindex
== ifindex
)
1826 if (count
>= sysctl_igmp_max_memberships
)
1828 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1832 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1833 iml
->next_rcu
= inet
->mc_list
;
1835 iml
->sfmode
= MCAST_EXCLUDE
;
1836 rcu_assign_pointer(inet
->mc_list
, iml
);
1837 ip_mc_inc_group(in_dev
, addr
);
1843 EXPORT_SYMBOL(ip_mc_join_group
);
1845 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1846 struct in_device
*in_dev
)
1848 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1852 /* any-source empty exclude case */
1853 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1854 iml
->sfmode
, 0, NULL
, 0);
1856 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1857 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1858 RCU_INIT_POINTER(iml
->sflist
, NULL
);
1859 /* decrease mem now to avoid the memleak warning */
1860 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1861 kfree_rcu(psf
, rcu
);
1866 * Ask a socket to leave a group.
1869 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1871 struct inet_sock
*inet
= inet_sk(sk
);
1872 struct ip_mc_socklist
*iml
;
1873 struct ip_mc_socklist __rcu
**imlp
;
1874 struct in_device
*in_dev
;
1875 struct net
*net
= sock_net(sk
);
1876 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1878 int ret
= -EADDRNOTAVAIL
;
1881 in_dev
= ip_mc_find_dev(net
, imr
);
1882 if (!imr
->imr_ifindex
&& !imr
->imr_address
.s_addr
&& !in_dev
) {
1886 ifindex
= imr
->imr_ifindex
;
1887 for (imlp
= &inet
->mc_list
;
1888 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1889 imlp
= &iml
->next_rcu
) {
1890 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1893 if (iml
->multi
.imr_ifindex
!= ifindex
)
1895 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1896 iml
->multi
.imr_address
.s_addr
)
1899 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1901 *imlp
= iml
->next_rcu
;
1904 ip_mc_dec_group(in_dev
, group
);
1907 /* decrease mem now to avoid the memleak warning */
1908 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1909 kfree_rcu(iml
, rcu
);
1916 EXPORT_SYMBOL(ip_mc_leave_group
);
1918 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1919 ip_mreq_source
*mreqs
, int ifindex
)
1922 struct ip_mreqn imr
;
1923 __be32 addr
= mreqs
->imr_multiaddr
;
1924 struct ip_mc_socklist
*pmc
;
1925 struct in_device
*in_dev
= NULL
;
1926 struct inet_sock
*inet
= inet_sk(sk
);
1927 struct ip_sf_socklist
*psl
;
1928 struct net
*net
= sock_net(sk
);
1932 if (!ipv4_is_multicast(addr
))
1937 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1938 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1939 imr
.imr_ifindex
= ifindex
;
1940 in_dev
= ip_mc_find_dev(net
, &imr
);
1946 err
= -EADDRNOTAVAIL
;
1948 for_each_pmc_rtnl(inet
, pmc
) {
1949 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1950 imr
.imr_multiaddr
.s_addr
) &&
1951 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1954 if (!pmc
) { /* must have a prior join */
1958 /* if a source filter was set, must be the same mode as before */
1960 if (pmc
->sfmode
!= omode
) {
1964 } else if (pmc
->sfmode
!= omode
) {
1965 /* allow mode switches for empty-set filters */
1966 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1967 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1969 pmc
->sfmode
= omode
;
1972 psl
= rtnl_dereference(pmc
->sflist
);
1975 goto done
; /* err = -EADDRNOTAVAIL */
1977 for (i
=0; i
<psl
->sl_count
; i
++) {
1978 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1983 if (rv
) /* source not found */
1984 goto done
; /* err = -EADDRNOTAVAIL */
1986 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1987 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1992 /* update the interface filter */
1993 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1994 &mreqs
->imr_sourceaddr
, 1);
1996 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1997 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
2002 /* else, add a new source to the filter */
2004 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
2008 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2009 struct ip_sf_socklist
*newpsl
;
2010 int count
= IP_SFBLOCK
;
2013 count
+= psl
->sl_max
;
2014 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2019 newpsl
->sl_max
= count
;
2020 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2022 for (i
=0; i
<psl
->sl_count
; i
++)
2023 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2024 /* decrease mem now to avoid the memleak warning */
2025 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2026 kfree_rcu(psl
, rcu
);
2028 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2031 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2032 for (i
=0; i
<psl
->sl_count
; i
++) {
2033 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2038 if (rv
== 0) /* address already there is an error */
2040 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2041 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2042 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2045 /* update the interface list */
2046 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2047 &mreqs
->imr_sourceaddr
, 1);
2051 return ip_mc_leave_group(sk
, &imr
);
2055 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2058 struct ip_mreqn imr
;
2059 __be32 addr
= msf
->imsf_multiaddr
;
2060 struct ip_mc_socklist
*pmc
;
2061 struct in_device
*in_dev
;
2062 struct inet_sock
*inet
= inet_sk(sk
);
2063 struct ip_sf_socklist
*newpsl
, *psl
;
2064 struct net
*net
= sock_net(sk
);
2067 if (!ipv4_is_multicast(addr
))
2069 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2070 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2075 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2076 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2077 imr
.imr_ifindex
= ifindex
;
2078 in_dev
= ip_mc_find_dev(net
, &imr
);
2085 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2086 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2091 for_each_pmc_rtnl(inet
, pmc
) {
2092 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2093 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2096 if (!pmc
) { /* must have a prior join */
2100 if (msf
->imsf_numsrc
) {
2101 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2107 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2108 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2109 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2110 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2111 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2113 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2118 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2119 msf
->imsf_fmode
, 0, NULL
, 0);
2121 psl
= rtnl_dereference(pmc
->sflist
);
2123 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2124 psl
->sl_count
, psl
->sl_addr
, 0);
2125 /* decrease mem now to avoid the memleak warning */
2126 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2127 kfree_rcu(psl
, rcu
);
2129 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2131 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2132 pmc
->sfmode
= msf
->imsf_fmode
;
2137 err
= ip_mc_leave_group(sk
, &imr
);
2141 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2142 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2144 int err
, len
, count
, copycount
;
2145 struct ip_mreqn imr
;
2146 __be32 addr
= msf
->imsf_multiaddr
;
2147 struct ip_mc_socklist
*pmc
;
2148 struct in_device
*in_dev
;
2149 struct inet_sock
*inet
= inet_sk(sk
);
2150 struct ip_sf_socklist
*psl
;
2151 struct net
*net
= sock_net(sk
);
2153 if (!ipv4_is_multicast(addr
))
2158 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2159 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2160 imr
.imr_ifindex
= 0;
2161 in_dev
= ip_mc_find_dev(net
, &imr
);
2167 err
= -EADDRNOTAVAIL
;
2169 for_each_pmc_rtnl(inet
, pmc
) {
2170 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2171 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2174 if (!pmc
) /* must have a prior join */
2176 msf
->imsf_fmode
= pmc
->sfmode
;
2177 psl
= rtnl_dereference(pmc
->sflist
);
2183 count
= psl
->sl_count
;
2185 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2186 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2187 msf
->imsf_numsrc
= count
;
2188 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2189 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2193 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2201 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2202 struct group_filter __user
*optval
, int __user
*optlen
)
2204 int err
, i
, count
, copycount
;
2205 struct sockaddr_in
*psin
;
2207 struct ip_mc_socklist
*pmc
;
2208 struct inet_sock
*inet
= inet_sk(sk
);
2209 struct ip_sf_socklist
*psl
;
2211 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2212 if (psin
->sin_family
!= AF_INET
)
2214 addr
= psin
->sin_addr
.s_addr
;
2215 if (!ipv4_is_multicast(addr
))
2220 err
= -EADDRNOTAVAIL
;
2222 for_each_pmc_rtnl(inet
, pmc
) {
2223 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2224 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2227 if (!pmc
) /* must have a prior join */
2229 gsf
->gf_fmode
= pmc
->sfmode
;
2230 psl
= rtnl_dereference(pmc
->sflist
);
2232 count
= psl
? psl
->sl_count
: 0;
2233 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2234 gsf
->gf_numsrc
= count
;
2235 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2236 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2239 for (i
=0; i
<copycount
; i
++) {
2240 struct sockaddr_storage ss
;
2242 psin
= (struct sockaddr_in
*)&ss
;
2243 memset(&ss
, 0, sizeof(ss
));
2244 psin
->sin_family
= AF_INET
;
2245 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2246 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2256 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2258 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2260 struct inet_sock
*inet
= inet_sk(sk
);
2261 struct ip_mc_socklist
*pmc
;
2262 struct ip_sf_socklist
*psl
;
2267 if (!ipv4_is_multicast(loc_addr
))
2271 for_each_pmc_rcu(inet
, pmc
) {
2272 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2273 pmc
->multi
.imr_ifindex
== dif
)
2279 psl
= rcu_dereference(pmc
->sflist
);
2280 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2284 for (i
=0; i
<psl
->sl_count
; i
++) {
2285 if (psl
->sl_addr
[i
] == rmt_addr
)
2289 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2291 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2301 * A socket is closing.
2304 void ip_mc_drop_socket(struct sock
*sk
)
2306 struct inet_sock
*inet
= inet_sk(sk
);
2307 struct ip_mc_socklist
*iml
;
2308 struct net
*net
= sock_net(sk
);
2310 if (inet
->mc_list
== NULL
)
2314 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2315 struct in_device
*in_dev
;
2317 inet
->mc_list
= iml
->next_rcu
;
2318 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2319 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2321 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2322 /* decrease mem now to avoid the memleak warning */
2323 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2324 kfree_rcu(iml
, rcu
);
2329 /* called with rcu_read_lock() */
2330 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2332 struct ip_mc_list
*im
;
2333 struct ip_sf_list
*psf
;
2336 for_each_pmc_rcu(in_dev
, im
) {
2337 if (im
->multiaddr
== mc_addr
)
2340 if (im
&& proto
== IPPROTO_IGMP
) {
2344 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2345 if (psf
->sf_inaddr
== src_addr
)
2349 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2350 psf
->sf_count
[MCAST_EXCLUDE
] !=
2351 im
->sfcount
[MCAST_EXCLUDE
];
2353 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2355 rv
= 1; /* unspecified source; tentatively allow */
2360 #if defined(CONFIG_PROC_FS)
2361 struct igmp_mc_iter_state
{
2362 struct seq_net_private p
;
2363 struct net_device
*dev
;
2364 struct in_device
*in_dev
;
2367 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2369 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2371 struct net
*net
= seq_file_net(seq
);
2372 struct ip_mc_list
*im
= NULL
;
2373 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2375 state
->in_dev
= NULL
;
2376 for_each_netdev_rcu(net
, state
->dev
) {
2377 struct in_device
*in_dev
;
2379 in_dev
= __in_dev_get_rcu(state
->dev
);
2382 im
= rcu_dereference(in_dev
->mc_list
);
2384 state
->in_dev
= in_dev
;
2391 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2393 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2395 im
= rcu_dereference(im
->next_rcu
);
2397 state
->dev
= next_net_device_rcu(state
->dev
);
2399 state
->in_dev
= NULL
;
2402 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2405 im
= rcu_dereference(state
->in_dev
->mc_list
);
2410 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2412 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2414 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2416 return pos
? NULL
: im
;
2419 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2423 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2426 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2428 struct ip_mc_list
*im
;
2429 if (v
== SEQ_START_TOKEN
)
2430 im
= igmp_mc_get_first(seq
);
2432 im
= igmp_mc_get_next(seq
, v
);
2437 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2440 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2442 state
->in_dev
= NULL
;
2447 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2449 if (v
== SEQ_START_TOKEN
)
2451 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2453 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2454 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2458 #ifdef CONFIG_IP_MULTICAST
2459 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2460 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2466 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2467 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2468 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2471 delta
= im
->timer
.expires
- jiffies
;
2473 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2474 im
->multiaddr
, im
->users
,
2476 im
->tm_running
? jiffies_delta_to_clock_t(delta
) : 0,
2482 static const struct seq_operations igmp_mc_seq_ops
= {
2483 .start
= igmp_mc_seq_start
,
2484 .next
= igmp_mc_seq_next
,
2485 .stop
= igmp_mc_seq_stop
,
2486 .show
= igmp_mc_seq_show
,
2489 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2491 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2492 sizeof(struct igmp_mc_iter_state
));
2495 static const struct file_operations igmp_mc_seq_fops
= {
2496 .owner
= THIS_MODULE
,
2497 .open
= igmp_mc_seq_open
,
2499 .llseek
= seq_lseek
,
2500 .release
= seq_release_net
,
2503 struct igmp_mcf_iter_state
{
2504 struct seq_net_private p
;
2505 struct net_device
*dev
;
2506 struct in_device
*idev
;
2507 struct ip_mc_list
*im
;
2510 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2512 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2514 struct net
*net
= seq_file_net(seq
);
2515 struct ip_sf_list
*psf
= NULL
;
2516 struct ip_mc_list
*im
= NULL
;
2517 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2521 for_each_netdev_rcu(net
, state
->dev
) {
2522 struct in_device
*idev
;
2523 idev
= __in_dev_get_rcu(state
->dev
);
2524 if (unlikely(idev
== NULL
))
2526 im
= rcu_dereference(idev
->mc_list
);
2527 if (likely(im
!= NULL
)) {
2528 spin_lock_bh(&im
->lock
);
2530 if (likely(psf
!= NULL
)) {
2535 spin_unlock_bh(&im
->lock
);
2541 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2543 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2547 spin_unlock_bh(&state
->im
->lock
);
2548 state
->im
= state
->im
->next
;
2549 while (!state
->im
) {
2550 state
->dev
= next_net_device_rcu(state
->dev
);
2555 state
->idev
= __in_dev_get_rcu(state
->dev
);
2558 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2562 spin_lock_bh(&state
->im
->lock
);
2563 psf
= state
->im
->sources
;
2569 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2571 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2573 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2575 return pos
? NULL
: psf
;
2578 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2582 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2585 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2587 struct ip_sf_list
*psf
;
2588 if (v
== SEQ_START_TOKEN
)
2589 psf
= igmp_mcf_get_first(seq
);
2591 psf
= igmp_mcf_get_next(seq
, v
);
2596 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2599 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2600 if (likely(state
->im
!= NULL
)) {
2601 spin_unlock_bh(&state
->im
->lock
);
2609 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2611 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2612 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2614 if (v
== SEQ_START_TOKEN
) {
2617 "%10s %10s %6s %6s\n", "Idx",
2619 "SRC", "INC", "EXC");
2623 "0x%08x %6lu %6lu\n",
2624 state
->dev
->ifindex
, state
->dev
->name
,
2625 ntohl(state
->im
->multiaddr
),
2626 ntohl(psf
->sf_inaddr
),
2627 psf
->sf_count
[MCAST_INCLUDE
],
2628 psf
->sf_count
[MCAST_EXCLUDE
]);
2633 static const struct seq_operations igmp_mcf_seq_ops
= {
2634 .start
= igmp_mcf_seq_start
,
2635 .next
= igmp_mcf_seq_next
,
2636 .stop
= igmp_mcf_seq_stop
,
2637 .show
= igmp_mcf_seq_show
,
2640 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2642 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2643 sizeof(struct igmp_mcf_iter_state
));
2646 static const struct file_operations igmp_mcf_seq_fops
= {
2647 .owner
= THIS_MODULE
,
2648 .open
= igmp_mcf_seq_open
,
2650 .llseek
= seq_lseek
,
2651 .release
= seq_release_net
,
2654 static int __net_init
igmp_net_init(struct net
*net
)
2656 struct proc_dir_entry
*pde
;
2658 pde
= proc_create("igmp", S_IRUGO
, net
->proc_net
, &igmp_mc_seq_fops
);
2661 pde
= proc_create("mcfilter", S_IRUGO
, net
->proc_net
,
2662 &igmp_mcf_seq_fops
);
2668 remove_proc_entry("igmp", net
->proc_net
);
2673 static void __net_exit
igmp_net_exit(struct net
*net
)
2675 remove_proc_entry("mcfilter", net
->proc_net
);
2676 remove_proc_entry("igmp", net
->proc_net
);
2679 static struct pernet_operations igmp_net_ops
= {
2680 .init
= igmp_net_init
,
2681 .exit
= igmp_net_exit
,
2684 int __init
igmp_mc_proc_init(void)
2686 return register_pernet_subsys(&igmp_net_ops
);