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>
91 #include <linux/pkt_sched.h>
93 #include <net/net_namespace.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
99 #include <net/checksum.h>
100 #include <net/inet_common.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
110 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
113 /* IGMP reports for link-local multicast groups are enabled by default */
114 int sysctl_igmp_llm_reports __read_mostly
= 1;
116 #ifdef CONFIG_IP_MULTICAST
117 /* Parameter names and values are taken from igmp-v2-06 draft */
119 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
120 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
121 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
122 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
123 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
124 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
127 #define IGMP_INITIAL_REPORT_DELAY (1)
129 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
130 * IGMP specs require to report membership immediately after
131 * joining a group, but we delay the first report by a
132 * small interval. It seems more natural and still does not
133 * contradict to specs provided this delay is small enough.
136 #define IGMP_V1_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
139 ((in_dev)->mr_v1_seen && \
140 time_before(jiffies, (in_dev)->mr_v1_seen)))
141 #define IGMP_V2_SEEN(in_dev) \
142 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
143 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
144 ((in_dev)->mr_v2_seen && \
145 time_before(jiffies, (in_dev)->mr_v2_seen)))
147 static int unsolicited_report_interval(struct in_device
*in_dev
)
149 int interval_ms
, interval_jiffies
;
151 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
152 interval_ms
= IN_DEV_CONF_GET(
154 IGMPV2_UNSOLICITED_REPORT_INTERVAL
);
156 interval_ms
= IN_DEV_CONF_GET(
158 IGMPV3_UNSOLICITED_REPORT_INTERVAL
);
160 interval_jiffies
= msecs_to_jiffies(interval_ms
);
162 /* _timer functions can't handle a delay of 0 jiffies so ensure
163 * we always return a positive value.
165 if (interval_jiffies
<= 0)
166 interval_jiffies
= 1;
167 return interval_jiffies
;
170 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
171 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
);
172 static void igmpv3_clear_delrec(struct in_device
*in_dev
);
173 static int sf_setstate(struct ip_mc_list
*pmc
);
174 static void sf_markstate(struct ip_mc_list
*pmc
);
176 static void ip_mc_clear_src(struct ip_mc_list
*pmc
);
177 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
178 int sfcount
, __be32
*psfsrc
, int delta
);
180 static void ip_ma_put(struct ip_mc_list
*im
)
182 if (atomic_dec_and_test(&im
->refcnt
)) {
183 in_dev_put(im
->interface
);
188 #define for_each_pmc_rcu(in_dev, pmc) \
189 for (pmc = rcu_dereference(in_dev->mc_list); \
191 pmc = rcu_dereference(pmc->next_rcu))
193 #define for_each_pmc_rtnl(in_dev, pmc) \
194 for (pmc = rtnl_dereference(in_dev->mc_list); \
196 pmc = rtnl_dereference(pmc->next_rcu))
198 #ifdef CONFIG_IP_MULTICAST
204 static void igmp_stop_timer(struct ip_mc_list
*im
)
206 spin_lock_bh(&im
->lock
);
207 if (del_timer(&im
->timer
))
208 atomic_dec(&im
->refcnt
);
211 im
->unsolicit_count
= 0;
212 spin_unlock_bh(&im
->lock
);
215 /* It must be called with locked im->lock */
216 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
218 int tv
= prandom_u32() % max_delay
;
221 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
222 atomic_inc(&im
->refcnt
);
225 static void igmp_gq_start_timer(struct in_device
*in_dev
)
227 int tv
= prandom_u32() % in_dev
->mr_maxdelay
;
229 in_dev
->mr_gq_running
= 1;
230 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
234 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
236 int tv
= prandom_u32() % delay
;
238 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
242 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
244 spin_lock_bh(&im
->lock
);
245 im
->unsolicit_count
= 0;
246 if (del_timer(&im
->timer
)) {
247 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
248 add_timer(&im
->timer
);
250 spin_unlock_bh(&im
->lock
);
253 atomic_dec(&im
->refcnt
);
255 igmp_start_timer(im
, max_delay
);
256 spin_unlock_bh(&im
->lock
);
261 * Send an IGMP report.
264 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
267 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
268 int gdeleted
, int sdeleted
)
271 case IGMPV3_MODE_IS_INCLUDE
:
272 case IGMPV3_MODE_IS_EXCLUDE
:
273 if (gdeleted
|| sdeleted
)
275 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
276 if (pmc
->sfmode
== MCAST_INCLUDE
)
278 /* don't include if this source is excluded
281 if (psf
->sf_count
[MCAST_INCLUDE
])
282 return type
== IGMPV3_MODE_IS_INCLUDE
;
283 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
284 psf
->sf_count
[MCAST_EXCLUDE
];
287 case IGMPV3_CHANGE_TO_INCLUDE
:
288 if (gdeleted
|| sdeleted
)
290 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
291 case IGMPV3_CHANGE_TO_EXCLUDE
:
292 if (gdeleted
|| sdeleted
)
294 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
295 psf
->sf_count
[MCAST_INCLUDE
])
297 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
298 psf
->sf_count
[MCAST_EXCLUDE
];
299 case IGMPV3_ALLOW_NEW_SOURCES
:
300 if (gdeleted
|| !psf
->sf_crcount
)
302 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
303 case IGMPV3_BLOCK_OLD_SOURCES
:
304 if (pmc
->sfmode
== MCAST_INCLUDE
)
305 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
306 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
312 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
314 struct ip_sf_list
*psf
;
317 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
318 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
325 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, unsigned int mtu
)
330 struct igmpv3_report
*pig
;
331 struct net
*net
= dev_net(dev
);
333 int hlen
= LL_RESERVED_SPACE(dev
);
334 int tlen
= dev
->needed_tailroom
;
335 unsigned int size
= mtu
;
338 skb
= alloc_skb(size
+ hlen
+ tlen
,
339 GFP_ATOMIC
| __GFP_NOWARN
);
346 skb
->priority
= TC_PRIO_CONTROL
;
348 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
350 IPPROTO_IGMP
, 0, dev
->ifindex
);
356 skb_dst_set(skb
, &rt
->dst
);
359 skb_reserve(skb
, hlen
);
360 skb_tailroom_reserve(skb
, mtu
, tlen
);
362 skb_reset_network_header(skb
);
364 skb_put(skb
, sizeof(struct iphdr
) + 4);
367 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
369 pip
->frag_off
= htons(IP_DF
);
371 pip
->daddr
= fl4
.daddr
;
372 pip
->saddr
= fl4
.saddr
;
373 pip
->protocol
= IPPROTO_IGMP
;
374 pip
->tot_len
= 0; /* filled in later */
375 ip_select_ident(net
, skb
, NULL
);
376 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
377 ((u8
*)&pip
[1])[1] = 4;
378 ((u8
*)&pip
[1])[2] = 0;
379 ((u8
*)&pip
[1])[3] = 0;
381 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
382 skb_put(skb
, sizeof(*pig
));
383 pig
= igmpv3_report_hdr(skb
);
384 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
392 static int igmpv3_sendpack(struct sk_buff
*skb
)
394 struct igmphdr
*pig
= igmp_hdr(skb
);
395 const int igmplen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
397 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
399 return ip_local_out(dev_net(skb_dst(skb
)->dev
), skb
->sk
, skb
);
402 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
404 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
407 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
408 int type
, struct igmpv3_grec
**ppgr
)
410 struct net_device
*dev
= pmc
->interface
->dev
;
411 struct igmpv3_report
*pih
;
412 struct igmpv3_grec
*pgr
;
415 skb
= igmpv3_newpack(dev
, dev
->mtu
);
418 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
419 pgr
->grec_type
= type
;
420 pgr
->grec_auxwords
= 0;
422 pgr
->grec_mca
= pmc
->multiaddr
;
423 pih
= igmpv3_report_hdr(skb
);
424 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
429 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
431 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
432 int type
, int gdeleted
, int sdeleted
)
434 struct net_device
*dev
= pmc
->interface
->dev
;
435 struct igmpv3_report
*pih
;
436 struct igmpv3_grec
*pgr
= NULL
;
437 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
438 int scount
, stotal
, first
, isquery
, truncate
;
440 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
442 if (ipv4_is_local_multicast(pmc
->multiaddr
) && !sysctl_igmp_llm_reports
)
445 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
446 type
== IGMPV3_MODE_IS_EXCLUDE
;
447 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
448 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
452 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
457 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
459 /* EX and TO_EX get a fresh packet, if needed */
461 if (pih
&& pih
->ngrec
&&
462 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
464 igmpv3_sendpack(skb
);
465 skb
= igmpv3_newpack(dev
, dev
->mtu
);
470 for (psf
= *psf_list
; psf
; psf
= psf_next
) {
473 psf_next
= psf
->sf_next
;
475 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
480 /* clear marks on query responses */
484 if (AVAILABLE(skb
) < sizeof(__be32
) +
485 first
*sizeof(struct igmpv3_grec
)) {
486 if (truncate
&& !first
)
487 break; /* truncate these */
489 pgr
->grec_nsrcs
= htons(scount
);
491 igmpv3_sendpack(skb
);
492 skb
= igmpv3_newpack(dev
, dev
->mtu
);
497 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
502 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
503 *psrc
= psf
->sf_inaddr
;
505 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
506 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
508 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
510 psf_prev
->sf_next
= psf
->sf_next
;
512 *psf_list
= psf
->sf_next
;
522 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
523 type
== IGMPV3_BLOCK_OLD_SOURCES
)
525 if (pmc
->crcount
|| isquery
) {
526 /* make sure we have room for group header */
527 if (skb
&& AVAILABLE(skb
) < sizeof(struct igmpv3_grec
)) {
528 igmpv3_sendpack(skb
);
529 skb
= NULL
; /* add_grhead will get a new one */
531 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
535 pgr
->grec_nsrcs
= htons(scount
);
538 pmc
->gsquery
= 0; /* clear query state on report */
542 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
544 struct sk_buff
*skb
= NULL
;
549 for_each_pmc_rcu(in_dev
, pmc
) {
550 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
552 if (ipv4_is_local_multicast(pmc
->multiaddr
) &&
553 !sysctl_igmp_llm_reports
)
555 spin_lock_bh(&pmc
->lock
);
556 if (pmc
->sfcount
[MCAST_EXCLUDE
])
557 type
= IGMPV3_MODE_IS_EXCLUDE
;
559 type
= IGMPV3_MODE_IS_INCLUDE
;
560 skb
= add_grec(skb
, pmc
, type
, 0, 0);
561 spin_unlock_bh(&pmc
->lock
);
565 spin_lock_bh(&pmc
->lock
);
566 if (pmc
->sfcount
[MCAST_EXCLUDE
])
567 type
= IGMPV3_MODE_IS_EXCLUDE
;
569 type
= IGMPV3_MODE_IS_INCLUDE
;
570 skb
= add_grec(skb
, pmc
, type
, 0, 0);
571 spin_unlock_bh(&pmc
->lock
);
575 return igmpv3_sendpack(skb
);
579 * remove zero-count source records from a source filter list
581 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
583 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
586 for (psf
= *ppsf
; psf
; psf
= psf_next
) {
587 psf_next
= psf
->sf_next
;
588 if (psf
->sf_crcount
== 0) {
590 psf_prev
->sf_next
= psf
->sf_next
;
592 *ppsf
= psf
->sf_next
;
599 static void igmpv3_send_cr(struct in_device
*in_dev
)
601 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
602 struct sk_buff
*skb
= NULL
;
606 spin_lock_bh(&in_dev
->mc_tomb_lock
);
610 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc_next
) {
611 pmc_next
= pmc
->next
;
612 if (pmc
->sfmode
== MCAST_INCLUDE
) {
613 type
= IGMPV3_BLOCK_OLD_SOURCES
;
614 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
615 skb
= add_grec(skb
, pmc
, type
, 1, 0);
616 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
619 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
620 type
= IGMPV3_CHANGE_TO_INCLUDE
;
621 skb
= add_grec(skb
, pmc
, type
, 1, 0);
624 if (pmc
->crcount
== 0) {
625 igmpv3_clear_zeros(&pmc
->tomb
);
626 igmpv3_clear_zeros(&pmc
->sources
);
629 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
631 pmc_prev
->next
= pmc_next
;
633 in_dev
->mc_tomb
= pmc_next
;
634 in_dev_put(pmc
->interface
);
639 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
642 for_each_pmc_rcu(in_dev
, pmc
) {
643 spin_lock_bh(&pmc
->lock
);
644 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
645 type
= IGMPV3_BLOCK_OLD_SOURCES
;
646 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
648 type
= IGMPV3_ALLOW_NEW_SOURCES
;
649 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
651 skb
= add_grec(skb
, pmc
, type
, 0, 0);
652 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
654 /* filter mode changes */
656 if (pmc
->sfmode
== MCAST_EXCLUDE
)
657 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
659 type
= IGMPV3_CHANGE_TO_INCLUDE
;
660 skb
= add_grec(skb
, pmc
, type
, 0, 0);
663 spin_unlock_bh(&pmc
->lock
);
669 (void) igmpv3_sendpack(skb
);
672 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
679 struct net_device
*dev
= in_dev
->dev
;
680 struct net
*net
= dev_net(dev
);
681 __be32 group
= pmc
? pmc
->multiaddr
: 0;
686 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
687 return igmpv3_send_report(in_dev
, pmc
);
689 if (ipv4_is_local_multicast(group
) && !sysctl_igmp_llm_reports
)
692 if (type
== IGMP_HOST_LEAVE_MESSAGE
)
693 dst
= IGMP_ALL_ROUTER
;
697 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
699 IPPROTO_IGMP
, 0, dev
->ifindex
);
703 hlen
= LL_RESERVED_SPACE(dev
);
704 tlen
= dev
->needed_tailroom
;
705 skb
= alloc_skb(IGMP_SIZE
+ hlen
+ tlen
, GFP_ATOMIC
);
710 skb
->priority
= TC_PRIO_CONTROL
;
712 skb_dst_set(skb
, &rt
->dst
);
714 skb_reserve(skb
, hlen
);
716 skb_reset_network_header(skb
);
718 skb_put(skb
, sizeof(struct iphdr
) + 4);
721 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
723 iph
->frag_off
= htons(IP_DF
);
726 iph
->saddr
= fl4
.saddr
;
727 iph
->protocol
= IPPROTO_IGMP
;
728 ip_select_ident(net
, skb
, NULL
);
729 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
730 ((u8
*)&iph
[1])[1] = 4;
731 ((u8
*)&iph
[1])[2] = 0;
732 ((u8
*)&iph
[1])[3] = 0;
734 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
739 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
741 return ip_local_out(net
, skb
->sk
, skb
);
744 static void igmp_gq_timer_expire(unsigned long data
)
746 struct in_device
*in_dev
= (struct in_device
*)data
;
748 in_dev
->mr_gq_running
= 0;
749 igmpv3_send_report(in_dev
, NULL
);
753 static void igmp_ifc_timer_expire(unsigned long data
)
755 struct in_device
*in_dev
= (struct in_device
*)data
;
757 igmpv3_send_cr(in_dev
);
758 if (in_dev
->mr_ifc_count
) {
759 in_dev
->mr_ifc_count
--;
760 igmp_ifc_start_timer(in_dev
,
761 unsolicited_report_interval(in_dev
));
766 static void igmp_ifc_event(struct in_device
*in_dev
)
768 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
770 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
?: sysctl_igmp_qrv
;
771 igmp_ifc_start_timer(in_dev
, 1);
775 static void igmp_timer_expire(unsigned long data
)
777 struct ip_mc_list
*im
= (struct ip_mc_list
*)data
;
778 struct in_device
*in_dev
= im
->interface
;
780 spin_lock(&im
->lock
);
783 if (im
->unsolicit_count
) {
784 im
->unsolicit_count
--;
785 igmp_start_timer(im
, unsolicited_report_interval(in_dev
));
788 spin_unlock(&im
->lock
);
790 if (IGMP_V1_SEEN(in_dev
))
791 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
792 else if (IGMP_V2_SEEN(in_dev
))
793 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
795 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
800 /* mark EXCLUDE-mode sources */
801 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
803 struct ip_sf_list
*psf
;
807 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
810 for (i
= 0; i
< nsrcs
; i
++) {
811 /* skip inactive filters */
812 if (psf
->sf_count
[MCAST_INCLUDE
] ||
813 pmc
->sfcount
[MCAST_EXCLUDE
] !=
814 psf
->sf_count
[MCAST_EXCLUDE
])
816 if (srcs
[i
] == psf
->sf_inaddr
) {
823 if (scount
== nsrcs
) /* all sources excluded */
828 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
830 struct ip_sf_list
*psf
;
833 if (pmc
->sfmode
== MCAST_EXCLUDE
)
834 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
836 /* mark INCLUDE-mode sources */
838 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
841 for (i
= 0; i
< nsrcs
; i
++)
842 if (srcs
[i
] == psf
->sf_inaddr
) {
856 /* return true if packet was dropped */
857 static bool igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
859 struct ip_mc_list
*im
;
861 /* Timers are only set for non-local groups */
863 if (group
== IGMP_ALL_HOSTS
)
865 if (ipv4_is_local_multicast(group
) && !sysctl_igmp_llm_reports
)
869 for_each_pmc_rcu(in_dev
, im
) {
870 if (im
->multiaddr
== group
) {
879 /* return true if packet was dropped */
880 static bool igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
883 struct igmphdr
*ih
= igmp_hdr(skb
);
884 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
885 struct ip_mc_list
*im
;
886 __be32 group
= ih
->group
;
893 /* Alas, old v1 router presents here. */
895 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
896 in_dev
->mr_v1_seen
= jiffies
+
897 IGMP_V1_ROUTER_PRESENT_TIMEOUT
;
900 /* v2 router present */
901 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
902 in_dev
->mr_v2_seen
= jiffies
+
903 IGMP_V2_ROUTER_PRESENT_TIMEOUT
;
905 /* cancel the interface change timer */
906 in_dev
->mr_ifc_count
= 0;
907 if (del_timer(&in_dev
->mr_ifc_timer
))
908 __in_dev_put(in_dev
);
909 /* clear deleted report items */
910 igmpv3_clear_delrec(in_dev
);
911 } else if (len
< 12) {
912 return true; /* ignore bogus packet; freed by caller */
913 } else if (IGMP_V1_SEEN(in_dev
)) {
914 /* This is a v3 query with v1 queriers present */
915 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
917 } else if (IGMP_V2_SEEN(in_dev
)) {
918 /* this is a v3 query with v2 queriers present;
919 * Interpretation of the max_delay code is problematic here.
920 * A real v2 host would use ih_code directly, while v3 has a
921 * different encoding. We use the v3 encoding as more likely
922 * to be intended in a v3 query.
924 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
926 max_delay
= 1; /* can't mod w/ 0 */
928 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
931 ih3
= igmpv3_query_hdr(skb
);
933 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
934 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
936 ih3
= igmpv3_query_hdr(skb
);
939 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
941 max_delay
= 1; /* can't mod w/ 0 */
942 in_dev
->mr_maxdelay
= max_delay
;
944 in_dev
->mr_qrv
= ih3
->qrv
;
945 if (!group
) { /* general query */
947 return true; /* no sources allowed */
948 igmp_gq_start_timer(in_dev
);
951 /* mark sources to include, if group & source-specific */
952 mark
= ih3
->nsrcs
!= 0;
956 * - Start the timers in all of our membership records
957 * that the query applies to for the interface on
958 * which the query arrived excl. those that belong
959 * to a "local" group (224.0.0.X)
960 * - For timers already running check if they need to
962 * - Use the igmp->igmp_code field as the maximum
966 for_each_pmc_rcu(in_dev
, im
) {
969 if (group
&& group
!= im
->multiaddr
)
971 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
973 if (ipv4_is_local_multicast(im
->multiaddr
) &&
974 !sysctl_igmp_llm_reports
)
976 spin_lock_bh(&im
->lock
);
978 im
->gsquery
= im
->gsquery
&& mark
;
981 changed
= !im
->gsquery
||
982 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
983 spin_unlock_bh(&im
->lock
);
985 igmp_mod_timer(im
, max_delay
);
991 /* called in rcu_read_lock() section */
992 int igmp_rcv(struct sk_buff
*skb
)
994 /* This basically follows the spec line by line -- see RFC1112 */
996 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
1003 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
1006 if (skb_checksum_simple_validate(skb
))
1011 case IGMP_HOST_MEMBERSHIP_QUERY
:
1012 dropped
= igmp_heard_query(in_dev
, skb
, len
);
1014 case IGMP_HOST_MEMBERSHIP_REPORT
:
1015 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1016 /* Is it our report looped back? */
1017 if (rt_is_output_route(skb_rtable(skb
)))
1019 /* don't rely on MC router hearing unicast reports */
1020 if (skb
->pkt_type
== PACKET_MULTICAST
||
1021 skb
->pkt_type
== PACKET_BROADCAST
)
1022 dropped
= igmp_heard_report(in_dev
, ih
->group
);
1025 #ifdef CONFIG_IP_PIMSM_V1
1026 return pim_rcv_v1(skb
);
1028 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1031 case IGMP_HOST_LEAVE_MESSAGE
:
1033 case IGMP_MTRACE_RESP
:
1051 * Add a filter to a device
1054 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1056 char buf
[MAX_ADDR_LEN
];
1057 struct net_device
*dev
= in_dev
->dev
;
1059 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1060 We will get multicast token leakage, when IFF_MULTICAST
1061 is changed. This check should be done in ndo_set_rx_mode
1062 routine. Something sort of:
1063 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1066 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1067 dev_mc_add(dev
, buf
);
1071 * Remove a filter from a device
1074 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1076 char buf
[MAX_ADDR_LEN
];
1077 struct net_device
*dev
= in_dev
->dev
;
1079 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1080 dev_mc_del(dev
, buf
);
1083 #ifdef CONFIG_IP_MULTICAST
1085 * deleted ip_mc_list manipulation
1087 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1089 struct ip_mc_list
*pmc
;
1091 /* this is an "ip_mc_list" for convenience; only the fields below
1092 * are actually used. In particular, the refcnt and users are not
1093 * used for management of the delete list. Using the same structure
1094 * for deleted items allows change reports to use common code with
1095 * non-deleted or query-response MCA's.
1097 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1100 spin_lock_bh(&im
->lock
);
1101 pmc
->interface
= im
->interface
;
1102 in_dev_hold(in_dev
);
1103 pmc
->multiaddr
= im
->multiaddr
;
1104 pmc
->crcount
= in_dev
->mr_qrv
?: sysctl_igmp_qrv
;
1105 pmc
->sfmode
= im
->sfmode
;
1106 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1107 struct ip_sf_list
*psf
;
1109 pmc
->tomb
= im
->tomb
;
1110 pmc
->sources
= im
->sources
;
1111 im
->tomb
= im
->sources
= NULL
;
1112 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1113 psf
->sf_crcount
= pmc
->crcount
;
1115 spin_unlock_bh(&im
->lock
);
1117 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1118 pmc
->next
= in_dev
->mc_tomb
;
1119 in_dev
->mc_tomb
= pmc
;
1120 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1123 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1125 struct ip_mc_list
*pmc
, *pmc_prev
;
1126 struct ip_sf_list
*psf
, *psf_next
;
1128 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1130 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc
->next
) {
1131 if (pmc
->multiaddr
== multiaddr
)
1137 pmc_prev
->next
= pmc
->next
;
1139 in_dev
->mc_tomb
= pmc
->next
;
1141 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1143 for (psf
= pmc
->tomb
; psf
; psf
= psf_next
) {
1144 psf_next
= psf
->sf_next
;
1147 in_dev_put(pmc
->interface
);
1152 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1154 struct ip_mc_list
*pmc
, *nextpmc
;
1156 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1157 pmc
= in_dev
->mc_tomb
;
1158 in_dev
->mc_tomb
= NULL
;
1159 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1161 for (; pmc
; pmc
= nextpmc
) {
1162 nextpmc
= pmc
->next
;
1163 ip_mc_clear_src(pmc
);
1164 in_dev_put(pmc
->interface
);
1167 /* clear dead sources, too */
1169 for_each_pmc_rcu(in_dev
, pmc
) {
1170 struct ip_sf_list
*psf
, *psf_next
;
1172 spin_lock_bh(&pmc
->lock
);
1175 spin_unlock_bh(&pmc
->lock
);
1176 for (; psf
; psf
= psf_next
) {
1177 psf_next
= psf
->sf_next
;
1185 static void igmp_group_dropped(struct ip_mc_list
*im
)
1187 struct in_device
*in_dev
= im
->interface
;
1188 #ifdef CONFIG_IP_MULTICAST
1194 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1197 #ifdef CONFIG_IP_MULTICAST
1198 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1200 if (ipv4_is_local_multicast(im
->multiaddr
) && !sysctl_igmp_llm_reports
)
1203 reporter
= im
->reporter
;
1204 igmp_stop_timer(im
);
1206 if (!in_dev
->dead
) {
1207 if (IGMP_V1_SEEN(in_dev
))
1209 if (IGMP_V2_SEEN(in_dev
)) {
1211 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1215 igmpv3_add_delrec(in_dev
, im
);
1217 igmp_ifc_event(in_dev
);
1222 static void igmp_group_added(struct ip_mc_list
*im
)
1224 struct in_device
*in_dev
= im
->interface
;
1226 if (im
->loaded
== 0) {
1228 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1231 #ifdef CONFIG_IP_MULTICAST
1232 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1234 if (ipv4_is_local_multicast(im
->multiaddr
) && !sysctl_igmp_llm_reports
)
1239 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1240 spin_lock_bh(&im
->lock
);
1241 igmp_start_timer(im
, IGMP_INITIAL_REPORT_DELAY
);
1242 spin_unlock_bh(&im
->lock
);
1247 im
->crcount
= in_dev
->mr_qrv
?: sysctl_igmp_qrv
;
1248 igmp_ifc_event(in_dev
);
1254 * Multicast list managers
1257 static u32
ip_mc_hash(const struct ip_mc_list
*im
)
1259 return hash_32((__force u32
)im
->multiaddr
, MC_HASH_SZ_LOG
);
1262 static void ip_mc_hash_add(struct in_device
*in_dev
,
1263 struct ip_mc_list
*im
)
1265 struct ip_mc_list __rcu
**mc_hash
;
1268 mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1270 hash
= ip_mc_hash(im
);
1271 im
->next_hash
= mc_hash
[hash
];
1272 rcu_assign_pointer(mc_hash
[hash
], im
);
1276 /* do not use a hash table for small number of items */
1277 if (in_dev
->mc_count
< 4)
1280 mc_hash
= kzalloc(sizeof(struct ip_mc_list
*) << MC_HASH_SZ_LOG
,
1285 for_each_pmc_rtnl(in_dev
, im
) {
1286 hash
= ip_mc_hash(im
);
1287 im
->next_hash
= mc_hash
[hash
];
1288 RCU_INIT_POINTER(mc_hash
[hash
], im
);
1291 rcu_assign_pointer(in_dev
->mc_hash
, mc_hash
);
1294 static void ip_mc_hash_remove(struct in_device
*in_dev
,
1295 struct ip_mc_list
*im
)
1297 struct ip_mc_list __rcu
**mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1298 struct ip_mc_list
*aux
;
1302 mc_hash
+= ip_mc_hash(im
);
1303 while ((aux
= rtnl_dereference(*mc_hash
)) != im
)
1304 mc_hash
= &aux
->next_hash
;
1305 *mc_hash
= im
->next_hash
;
1310 * A socket has joined a multicast group on device dev.
1313 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1315 struct ip_mc_list
*im
;
1319 for_each_pmc_rtnl(in_dev
, im
) {
1320 if (im
->multiaddr
== addr
) {
1322 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1327 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1332 im
->interface
= in_dev
;
1333 in_dev_hold(in_dev
);
1334 im
->multiaddr
= addr
;
1335 /* initial mode is (EX, empty) */
1336 im
->sfmode
= MCAST_EXCLUDE
;
1337 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1338 atomic_set(&im
->refcnt
, 1);
1339 spin_lock_init(&im
->lock
);
1340 #ifdef CONFIG_IP_MULTICAST
1341 setup_timer(&im
->timer
, igmp_timer_expire
, (unsigned long)im
);
1342 im
->unsolicit_count
= sysctl_igmp_qrv
;
1345 im
->next_rcu
= in_dev
->mc_list
;
1347 rcu_assign_pointer(in_dev
->mc_list
, im
);
1349 ip_mc_hash_add(in_dev
, im
);
1351 #ifdef CONFIG_IP_MULTICAST
1352 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1354 igmp_group_added(im
);
1356 ip_rt_multicast_event(in_dev
);
1360 EXPORT_SYMBOL(ip_mc_inc_group
);
1362 static int ip_mc_check_iphdr(struct sk_buff
*skb
)
1364 const struct iphdr
*iph
;
1366 unsigned int offset
= skb_network_offset(skb
) + sizeof(*iph
);
1368 if (!pskb_may_pull(skb
, offset
))
1373 if (iph
->version
!= 4 || ip_hdrlen(skb
) < sizeof(*iph
))
1376 offset
+= ip_hdrlen(skb
) - sizeof(*iph
);
1378 if (!pskb_may_pull(skb
, offset
))
1383 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1386 len
= skb_network_offset(skb
) + ntohs(iph
->tot_len
);
1387 if (skb
->len
< len
|| len
< offset
)
1390 skb_set_transport_header(skb
, offset
);
1395 static int ip_mc_check_igmp_reportv3(struct sk_buff
*skb
)
1397 unsigned int len
= skb_transport_offset(skb
);
1399 len
+= sizeof(struct igmpv3_report
);
1401 return pskb_may_pull(skb
, len
) ? 0 : -EINVAL
;
1404 static int ip_mc_check_igmp_query(struct sk_buff
*skb
)
1406 unsigned int len
= skb_transport_offset(skb
);
1408 len
+= sizeof(struct igmphdr
);
1413 if (skb
->len
!= len
) {
1415 len
+= sizeof(struct igmpv3_query
) - sizeof(struct igmphdr
);
1416 if (skb
->len
< len
|| !pskb_may_pull(skb
, len
))
1420 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1421 * all-systems destination addresses (224.0.0.1) for general queries
1423 if (!igmp_hdr(skb
)->group
&&
1424 ip_hdr(skb
)->daddr
!= htonl(INADDR_ALLHOSTS_GROUP
))
1430 static int ip_mc_check_igmp_msg(struct sk_buff
*skb
)
1432 switch (igmp_hdr(skb
)->type
) {
1433 case IGMP_HOST_LEAVE_MESSAGE
:
1434 case IGMP_HOST_MEMBERSHIP_REPORT
:
1435 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1438 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1439 return ip_mc_check_igmp_reportv3(skb
);
1440 case IGMP_HOST_MEMBERSHIP_QUERY
:
1441 return ip_mc_check_igmp_query(skb
);
1447 static inline __sum16
ip_mc_validate_checksum(struct sk_buff
*skb
)
1449 return skb_checksum_simple_validate(skb
);
1452 static int __ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1455 struct sk_buff
*skb_chk
;
1456 unsigned int transport_len
;
1457 unsigned int len
= skb_transport_offset(skb
) + sizeof(struct igmphdr
);
1460 transport_len
= ntohs(ip_hdr(skb
)->tot_len
) - ip_hdrlen(skb
);
1462 skb_chk
= skb_checksum_trimmed(skb
, transport_len
,
1463 ip_mc_validate_checksum
);
1467 if (!pskb_may_pull(skb_chk
, len
))
1470 ret
= ip_mc_check_igmp_msg(skb_chk
);
1475 *skb_trimmed
= skb_chk
;
1476 /* free now unneeded clone */
1477 else if (skb_chk
!= skb
)
1483 if (ret
&& skb_chk
&& skb_chk
!= skb
)
1490 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1491 * @skb: the skb to validate
1492 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1494 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1495 * skb transport header accordingly and returns zero.
1497 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1499 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1500 * -ENOMEM: A memory allocation failure happened.
1502 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1503 * to NULL): After parsing an IGMP packet successfully it will point to
1504 * an skb which has its tail aligned to the IP packet end. This might
1505 * either be the originally provided skb or a trimmed, cloned version if
1506 * the skb frame had data beyond the IP packet. A cloned skb allows us
1507 * to leave the original skb and its full frame unchanged (which might be
1508 * desirable for layer 2 frame jugglers).
1510 * Caller needs to set the skb network header and free any returned skb if it
1511 * differs from the provided skb.
1513 int ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1515 int ret
= ip_mc_check_iphdr(skb
);
1520 if (ip_hdr(skb
)->protocol
!= IPPROTO_IGMP
)
1523 return __ip_mc_check_igmp(skb
, skb_trimmed
);
1525 EXPORT_SYMBOL(ip_mc_check_igmp
);
1528 * Resend IGMP JOIN report; used by netdev notifier.
1530 static void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1532 #ifdef CONFIG_IP_MULTICAST
1533 struct ip_mc_list
*im
;
1538 for_each_pmc_rtnl(in_dev
, im
) {
1539 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1541 if (ipv4_is_local_multicast(im
->multiaddr
) &&
1542 !sysctl_igmp_llm_reports
)
1545 /* a failover is happening and switches
1546 * must be notified immediately
1548 if (IGMP_V1_SEEN(in_dev
))
1549 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1550 else if (IGMP_V2_SEEN(in_dev
))
1551 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1553 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1554 igmp_send_report(in_dev
, im
, type
);
1560 * A socket has left a multicast group on device dev
1563 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1565 struct ip_mc_list
*i
;
1566 struct ip_mc_list __rcu
**ip
;
1570 for (ip
= &in_dev
->mc_list
;
1571 (i
= rtnl_dereference(*ip
)) != NULL
;
1572 ip
= &i
->next_rcu
) {
1573 if (i
->multiaddr
== addr
) {
1574 if (--i
->users
== 0) {
1575 ip_mc_hash_remove(in_dev
, i
);
1578 igmp_group_dropped(i
);
1582 ip_rt_multicast_event(in_dev
);
1591 EXPORT_SYMBOL(ip_mc_dec_group
);
1593 /* Device changing type */
1595 void ip_mc_unmap(struct in_device
*in_dev
)
1597 struct ip_mc_list
*pmc
;
1601 for_each_pmc_rtnl(in_dev
, pmc
)
1602 igmp_group_dropped(pmc
);
1605 void ip_mc_remap(struct in_device
*in_dev
)
1607 struct ip_mc_list
*pmc
;
1611 for_each_pmc_rtnl(in_dev
, pmc
)
1612 igmp_group_added(pmc
);
1615 /* Device going down */
1617 void ip_mc_down(struct in_device
*in_dev
)
1619 struct ip_mc_list
*pmc
;
1623 for_each_pmc_rtnl(in_dev
, pmc
)
1624 igmp_group_dropped(pmc
);
1626 #ifdef CONFIG_IP_MULTICAST
1627 in_dev
->mr_ifc_count
= 0;
1628 if (del_timer(&in_dev
->mr_ifc_timer
))
1629 __in_dev_put(in_dev
);
1630 in_dev
->mr_gq_running
= 0;
1631 if (del_timer(&in_dev
->mr_gq_timer
))
1632 __in_dev_put(in_dev
);
1633 igmpv3_clear_delrec(in_dev
);
1636 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1639 void ip_mc_init_dev(struct in_device
*in_dev
)
1643 #ifdef CONFIG_IP_MULTICAST
1644 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1645 (unsigned long)in_dev
);
1646 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1647 (unsigned long)in_dev
);
1648 in_dev
->mr_qrv
= sysctl_igmp_qrv
;
1651 spin_lock_init(&in_dev
->mc_tomb_lock
);
1654 /* Device going up */
1656 void ip_mc_up(struct in_device
*in_dev
)
1658 struct ip_mc_list
*pmc
;
1662 #ifdef CONFIG_IP_MULTICAST
1663 in_dev
->mr_qrv
= sysctl_igmp_qrv
;
1665 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1667 for_each_pmc_rtnl(in_dev
, pmc
)
1668 igmp_group_added(pmc
);
1672 * Device is about to be destroyed: clean up.
1675 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1677 struct ip_mc_list
*i
;
1681 /* Deactivate timers */
1684 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1685 in_dev
->mc_list
= i
->next_rcu
;
1688 /* We've dropped the groups in ip_mc_down already */
1694 /* RTNL is locked */
1695 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1697 struct net_device
*dev
= NULL
;
1698 struct in_device
*idev
= NULL
;
1700 if (imr
->imr_ifindex
) {
1701 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1704 if (imr
->imr_address
.s_addr
) {
1705 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1711 struct rtable
*rt
= ip_route_output(net
,
1712 imr
->imr_multiaddr
.s_addr
,
1720 imr
->imr_ifindex
= dev
->ifindex
;
1721 idev
= __in_dev_get_rtnl(dev
);
1727 * Join a socket to a group
1729 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1730 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1731 #ifdef CONFIG_IP_MULTICAST
1732 int sysctl_igmp_qrv __read_mostly
= IGMP_QUERY_ROBUSTNESS_VARIABLE
;
1735 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1738 struct ip_sf_list
*psf
, *psf_prev
;
1742 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1743 if (psf
->sf_inaddr
== *psfsrc
)
1747 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1748 /* source filter not found, or count wrong => bug */
1751 psf
->sf_count
[sfmode
]--;
1752 if (psf
->sf_count
[sfmode
] == 0) {
1753 ip_rt_multicast_event(pmc
->interface
);
1755 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1756 #ifdef CONFIG_IP_MULTICAST
1757 struct in_device
*in_dev
= pmc
->interface
;
1760 /* no more filters for this source */
1762 psf_prev
->sf_next
= psf
->sf_next
;
1764 pmc
->sources
= psf
->sf_next
;
1765 #ifdef CONFIG_IP_MULTICAST
1766 if (psf
->sf_oldin
&&
1767 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1768 psf
->sf_crcount
= in_dev
->mr_qrv
?: sysctl_igmp_qrv
;
1769 psf
->sf_next
= pmc
->tomb
;
1779 #ifndef CONFIG_IP_MULTICAST
1780 #define igmp_ifc_event(x) do { } while (0)
1783 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1784 int sfcount
, __be32
*psfsrc
, int delta
)
1786 struct ip_mc_list
*pmc
;
1793 for_each_pmc_rcu(in_dev
, pmc
) {
1794 if (*pmca
== pmc
->multiaddr
)
1798 /* MCA not found?? bug */
1802 spin_lock_bh(&pmc
->lock
);
1804 #ifdef CONFIG_IP_MULTICAST
1809 if (!pmc
->sfcount
[sfmode
])
1811 pmc
->sfcount
[sfmode
]--;
1814 for (i
= 0; i
< sfcount
; i
++) {
1815 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1817 changerec
|= rv
> 0;
1821 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1822 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1823 pmc
->sfcount
[MCAST_INCLUDE
]) {
1824 #ifdef CONFIG_IP_MULTICAST
1825 struct ip_sf_list
*psf
;
1828 /* filter mode change */
1829 pmc
->sfmode
= MCAST_INCLUDE
;
1830 #ifdef CONFIG_IP_MULTICAST
1831 pmc
->crcount
= in_dev
->mr_qrv
?: sysctl_igmp_qrv
;
1832 in_dev
->mr_ifc_count
= pmc
->crcount
;
1833 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1834 psf
->sf_crcount
= 0;
1835 igmp_ifc_event(pmc
->interface
);
1836 } else if (sf_setstate(pmc
) || changerec
) {
1837 igmp_ifc_event(pmc
->interface
);
1841 spin_unlock_bh(&pmc
->lock
);
1846 * Add multicast single-source filter to the interface list
1848 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1851 struct ip_sf_list
*psf
, *psf_prev
;
1854 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1855 if (psf
->sf_inaddr
== *psfsrc
)
1860 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1863 psf
->sf_inaddr
= *psfsrc
;
1865 psf_prev
->sf_next
= psf
;
1869 psf
->sf_count
[sfmode
]++;
1870 if (psf
->sf_count
[sfmode
] == 1) {
1871 ip_rt_multicast_event(pmc
->interface
);
1876 #ifdef CONFIG_IP_MULTICAST
1877 static void sf_markstate(struct ip_mc_list
*pmc
)
1879 struct ip_sf_list
*psf
;
1880 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1882 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1883 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1884 psf
->sf_oldin
= mca_xcount
==
1885 psf
->sf_count
[MCAST_EXCLUDE
] &&
1886 !psf
->sf_count
[MCAST_INCLUDE
];
1888 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1891 static int sf_setstate(struct ip_mc_list
*pmc
)
1893 struct ip_sf_list
*psf
, *dpsf
;
1894 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1895 int qrv
= pmc
->interface
->mr_qrv
;
1899 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1900 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1901 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1902 !psf
->sf_count
[MCAST_INCLUDE
];
1904 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1906 if (!psf
->sf_oldin
) {
1907 struct ip_sf_list
*prev
= NULL
;
1909 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
) {
1910 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1916 prev
->sf_next
= dpsf
->sf_next
;
1918 pmc
->tomb
= dpsf
->sf_next
;
1921 psf
->sf_crcount
= qrv
;
1924 } else if (psf
->sf_oldin
) {
1926 psf
->sf_crcount
= 0;
1928 * add or update "delete" records if an active filter
1931 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
)
1932 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1935 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1939 /* pmc->lock held by callers */
1940 dpsf
->sf_next
= pmc
->tomb
;
1943 dpsf
->sf_crcount
= qrv
;
1952 * Add multicast source filter list to the interface list
1954 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1955 int sfcount
, __be32
*psfsrc
, int delta
)
1957 struct ip_mc_list
*pmc
;
1964 for_each_pmc_rcu(in_dev
, pmc
) {
1965 if (*pmca
== pmc
->multiaddr
)
1969 /* MCA not found?? bug */
1973 spin_lock_bh(&pmc
->lock
);
1976 #ifdef CONFIG_IP_MULTICAST
1979 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1981 pmc
->sfcount
[sfmode
]++;
1983 for (i
= 0; i
< sfcount
; i
++) {
1984 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
1992 pmc
->sfcount
[sfmode
]--;
1993 for (j
= 0; j
< i
; j
++)
1994 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
1995 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1996 #ifdef CONFIG_IP_MULTICAST
1997 struct ip_sf_list
*psf
;
1998 in_dev
= pmc
->interface
;
2001 /* filter mode change */
2002 if (pmc
->sfcount
[MCAST_EXCLUDE
])
2003 pmc
->sfmode
= MCAST_EXCLUDE
;
2004 else if (pmc
->sfcount
[MCAST_INCLUDE
])
2005 pmc
->sfmode
= MCAST_INCLUDE
;
2006 #ifdef CONFIG_IP_MULTICAST
2007 /* else no filters; keep old mode for reports */
2009 pmc
->crcount
= in_dev
->mr_qrv
?: sysctl_igmp_qrv
;
2010 in_dev
->mr_ifc_count
= pmc
->crcount
;
2011 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
2012 psf
->sf_crcount
= 0;
2013 igmp_ifc_event(in_dev
);
2014 } else if (sf_setstate(pmc
)) {
2015 igmp_ifc_event(in_dev
);
2018 spin_unlock_bh(&pmc
->lock
);
2022 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
2024 struct ip_sf_list
*psf
, *nextpsf
;
2026 for (psf
= pmc
->tomb
; psf
; psf
= nextpsf
) {
2027 nextpsf
= psf
->sf_next
;
2031 for (psf
= pmc
->sources
; psf
; psf
= nextpsf
) {
2032 nextpsf
= psf
->sf_next
;
2035 pmc
->sources
= NULL
;
2036 pmc
->sfmode
= MCAST_EXCLUDE
;
2037 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
2038 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
2041 /* Join a multicast group
2044 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2046 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
2047 struct ip_mc_socklist
*iml
, *i
;
2048 struct in_device
*in_dev
;
2049 struct inet_sock
*inet
= inet_sk(sk
);
2050 struct net
*net
= sock_net(sk
);
2057 if (!ipv4_is_multicast(addr
))
2060 in_dev
= ip_mc_find_dev(net
, imr
);
2068 ifindex
= imr
->imr_ifindex
;
2069 for_each_pmc_rtnl(inet
, i
) {
2070 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
2071 i
->multi
.imr_ifindex
== ifindex
)
2076 if (count
>= sysctl_igmp_max_memberships
)
2078 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
2082 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
2083 iml
->next_rcu
= inet
->mc_list
;
2085 iml
->sfmode
= MCAST_EXCLUDE
;
2086 rcu_assign_pointer(inet
->mc_list
, iml
);
2087 ip_mc_inc_group(in_dev
, addr
);
2092 EXPORT_SYMBOL(ip_mc_join_group
);
2094 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
2095 struct in_device
*in_dev
)
2097 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
2101 /* any-source empty exclude case */
2102 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2103 iml
->sfmode
, 0, NULL
, 0);
2105 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2106 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
2107 RCU_INIT_POINTER(iml
->sflist
, NULL
);
2108 /* decrease mem now to avoid the memleak warning */
2109 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
2110 kfree_rcu(psf
, rcu
);
2114 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2116 struct inet_sock
*inet
= inet_sk(sk
);
2117 struct ip_mc_socklist
*iml
;
2118 struct ip_mc_socklist __rcu
**imlp
;
2119 struct in_device
*in_dev
;
2120 struct net
*net
= sock_net(sk
);
2121 __be32 group
= imr
->imr_multiaddr
.s_addr
;
2123 int ret
= -EADDRNOTAVAIL
;
2127 in_dev
= ip_mc_find_dev(net
, imr
);
2128 if (!imr
->imr_ifindex
&& !imr
->imr_address
.s_addr
&& !in_dev
) {
2132 ifindex
= imr
->imr_ifindex
;
2133 for (imlp
= &inet
->mc_list
;
2134 (iml
= rtnl_dereference(*imlp
)) != NULL
;
2135 imlp
= &iml
->next_rcu
) {
2136 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
2139 if (iml
->multi
.imr_ifindex
!= ifindex
)
2141 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
2142 iml
->multi
.imr_address
.s_addr
)
2145 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2147 *imlp
= iml
->next_rcu
;
2150 ip_mc_dec_group(in_dev
, group
);
2152 /* decrease mem now to avoid the memleak warning */
2153 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2154 kfree_rcu(iml
, rcu
);
2160 EXPORT_SYMBOL(ip_mc_leave_group
);
2162 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
2163 ip_mreq_source
*mreqs
, int ifindex
)
2166 struct ip_mreqn imr
;
2167 __be32 addr
= mreqs
->imr_multiaddr
;
2168 struct ip_mc_socklist
*pmc
;
2169 struct in_device
*in_dev
= NULL
;
2170 struct inet_sock
*inet
= inet_sk(sk
);
2171 struct ip_sf_socklist
*psl
;
2172 struct net
*net
= sock_net(sk
);
2176 if (!ipv4_is_multicast(addr
))
2181 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
2182 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
2183 imr
.imr_ifindex
= ifindex
;
2184 in_dev
= ip_mc_find_dev(net
, &imr
);
2190 err
= -EADDRNOTAVAIL
;
2192 for_each_pmc_rtnl(inet
, pmc
) {
2193 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
2194 imr
.imr_multiaddr
.s_addr
) &&
2195 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
2198 if (!pmc
) { /* must have a prior join */
2202 /* if a source filter was set, must be the same mode as before */
2204 if (pmc
->sfmode
!= omode
) {
2208 } else if (pmc
->sfmode
!= omode
) {
2209 /* allow mode switches for empty-set filters */
2210 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
2211 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
2213 pmc
->sfmode
= omode
;
2216 psl
= rtnl_dereference(pmc
->sflist
);
2219 goto done
; /* err = -EADDRNOTAVAIL */
2221 for (i
= 0; i
< psl
->sl_count
; i
++) {
2222 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2227 if (rv
) /* source not found */
2228 goto done
; /* err = -EADDRNOTAVAIL */
2230 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2231 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
2236 /* update the interface filter */
2237 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2238 &mreqs
->imr_sourceaddr
, 1);
2240 for (j
= i
+1; j
< psl
->sl_count
; j
++)
2241 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
2246 /* else, add a new source to the filter */
2248 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
2252 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2253 struct ip_sf_socklist
*newpsl
;
2254 int count
= IP_SFBLOCK
;
2257 count
+= psl
->sl_max
;
2258 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2263 newpsl
->sl_max
= count
;
2264 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2266 for (i
= 0; i
< psl
->sl_count
; i
++)
2267 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2268 /* decrease mem now to avoid the memleak warning */
2269 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2270 kfree_rcu(psl
, rcu
);
2272 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2275 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2276 for (i
= 0; i
< psl
->sl_count
; i
++) {
2277 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2282 if (rv
== 0) /* address already there is an error */
2284 for (j
= psl
->sl_count
-1; j
>= i
; j
--)
2285 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2286 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2289 /* update the interface list */
2290 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2291 &mreqs
->imr_sourceaddr
, 1);
2294 err
= ip_mc_leave_group(sk
, &imr
);
2298 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2301 struct ip_mreqn imr
;
2302 __be32 addr
= msf
->imsf_multiaddr
;
2303 struct ip_mc_socklist
*pmc
;
2304 struct in_device
*in_dev
;
2305 struct inet_sock
*inet
= inet_sk(sk
);
2306 struct ip_sf_socklist
*newpsl
, *psl
;
2307 struct net
*net
= sock_net(sk
);
2310 if (!ipv4_is_multicast(addr
))
2312 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2313 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2318 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2319 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2320 imr
.imr_ifindex
= ifindex
;
2321 in_dev
= ip_mc_find_dev(net
, &imr
);
2328 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2329 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2334 for_each_pmc_rtnl(inet
, pmc
) {
2335 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2336 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2339 if (!pmc
) { /* must have a prior join */
2343 if (msf
->imsf_numsrc
) {
2344 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2350 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2351 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2352 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2353 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2354 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2356 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2361 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2362 msf
->imsf_fmode
, 0, NULL
, 0);
2364 psl
= rtnl_dereference(pmc
->sflist
);
2366 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2367 psl
->sl_count
, psl
->sl_addr
, 0);
2368 /* decrease mem now to avoid the memleak warning */
2369 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2370 kfree_rcu(psl
, rcu
);
2372 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2374 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2375 pmc
->sfmode
= msf
->imsf_fmode
;
2379 err
= ip_mc_leave_group(sk
, &imr
);
2383 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2384 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2386 int err
, len
, count
, copycount
;
2387 struct ip_mreqn imr
;
2388 __be32 addr
= msf
->imsf_multiaddr
;
2389 struct ip_mc_socklist
*pmc
;
2390 struct in_device
*in_dev
;
2391 struct inet_sock
*inet
= inet_sk(sk
);
2392 struct ip_sf_socklist
*psl
;
2393 struct net
*net
= sock_net(sk
);
2397 if (!ipv4_is_multicast(addr
))
2400 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2401 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2402 imr
.imr_ifindex
= 0;
2403 in_dev
= ip_mc_find_dev(net
, &imr
);
2409 err
= -EADDRNOTAVAIL
;
2411 for_each_pmc_rtnl(inet
, pmc
) {
2412 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2413 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2416 if (!pmc
) /* must have a prior join */
2418 msf
->imsf_fmode
= pmc
->sfmode
;
2419 psl
= rtnl_dereference(pmc
->sflist
);
2424 count
= psl
->sl_count
;
2426 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2427 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2428 msf
->imsf_numsrc
= count
;
2429 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2430 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2434 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2441 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2442 struct group_filter __user
*optval
, int __user
*optlen
)
2444 int err
, i
, count
, copycount
;
2445 struct sockaddr_in
*psin
;
2447 struct ip_mc_socklist
*pmc
;
2448 struct inet_sock
*inet
= inet_sk(sk
);
2449 struct ip_sf_socklist
*psl
;
2453 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2454 if (psin
->sin_family
!= AF_INET
)
2456 addr
= psin
->sin_addr
.s_addr
;
2457 if (!ipv4_is_multicast(addr
))
2460 err
= -EADDRNOTAVAIL
;
2462 for_each_pmc_rtnl(inet
, pmc
) {
2463 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2464 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2467 if (!pmc
) /* must have a prior join */
2469 gsf
->gf_fmode
= pmc
->sfmode
;
2470 psl
= rtnl_dereference(pmc
->sflist
);
2471 count
= psl
? psl
->sl_count
: 0;
2472 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2473 gsf
->gf_numsrc
= count
;
2474 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2475 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2478 for (i
= 0; i
< copycount
; i
++) {
2479 struct sockaddr_storage ss
;
2481 psin
= (struct sockaddr_in
*)&ss
;
2482 memset(&ss
, 0, sizeof(ss
));
2483 psin
->sin_family
= AF_INET
;
2484 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2485 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2494 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2496 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2498 struct inet_sock
*inet
= inet_sk(sk
);
2499 struct ip_mc_socklist
*pmc
;
2500 struct ip_sf_socklist
*psl
;
2505 if (!ipv4_is_multicast(loc_addr
))
2509 for_each_pmc_rcu(inet
, pmc
) {
2510 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2511 pmc
->multi
.imr_ifindex
== dif
)
2517 psl
= rcu_dereference(pmc
->sflist
);
2518 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2522 for (i
= 0; i
< psl
->sl_count
; i
++) {
2523 if (psl
->sl_addr
[i
] == rmt_addr
)
2527 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2529 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2539 * A socket is closing.
2542 void ip_mc_drop_socket(struct sock
*sk
)
2544 struct inet_sock
*inet
= inet_sk(sk
);
2545 struct ip_mc_socklist
*iml
;
2546 struct net
*net
= sock_net(sk
);
2552 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2553 struct in_device
*in_dev
;
2555 inet
->mc_list
= iml
->next_rcu
;
2556 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2557 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2559 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2560 /* decrease mem now to avoid the memleak warning */
2561 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2562 kfree_rcu(iml
, rcu
);
2567 /* called with rcu_read_lock() */
2568 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u8 proto
)
2570 struct ip_mc_list
*im
;
2571 struct ip_mc_list __rcu
**mc_hash
;
2572 struct ip_sf_list
*psf
;
2575 mc_hash
= rcu_dereference(in_dev
->mc_hash
);
2577 u32 hash
= hash_32((__force u32
)mc_addr
, MC_HASH_SZ_LOG
);
2579 for (im
= rcu_dereference(mc_hash
[hash
]);
2581 im
= rcu_dereference(im
->next_hash
)) {
2582 if (im
->multiaddr
== mc_addr
)
2586 for_each_pmc_rcu(in_dev
, im
) {
2587 if (im
->multiaddr
== mc_addr
)
2591 if (im
&& proto
== IPPROTO_IGMP
) {
2595 for (psf
= im
->sources
; psf
; psf
= psf
->sf_next
) {
2596 if (psf
->sf_inaddr
== src_addr
)
2600 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2601 psf
->sf_count
[MCAST_EXCLUDE
] !=
2602 im
->sfcount
[MCAST_EXCLUDE
];
2604 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2606 rv
= 1; /* unspecified source; tentatively allow */
2611 #if defined(CONFIG_PROC_FS)
2612 struct igmp_mc_iter_state
{
2613 struct seq_net_private p
;
2614 struct net_device
*dev
;
2615 struct in_device
*in_dev
;
2618 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2620 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2622 struct net
*net
= seq_file_net(seq
);
2623 struct ip_mc_list
*im
= NULL
;
2624 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2626 state
->in_dev
= NULL
;
2627 for_each_netdev_rcu(net
, state
->dev
) {
2628 struct in_device
*in_dev
;
2630 in_dev
= __in_dev_get_rcu(state
->dev
);
2633 im
= rcu_dereference(in_dev
->mc_list
);
2635 state
->in_dev
= in_dev
;
2642 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2644 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2646 im
= rcu_dereference(im
->next_rcu
);
2648 state
->dev
= next_net_device_rcu(state
->dev
);
2650 state
->in_dev
= NULL
;
2653 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2656 im
= rcu_dereference(state
->in_dev
->mc_list
);
2661 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2663 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2665 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2667 return pos
? NULL
: im
;
2670 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2674 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2677 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2679 struct ip_mc_list
*im
;
2680 if (v
== SEQ_START_TOKEN
)
2681 im
= igmp_mc_get_first(seq
);
2683 im
= igmp_mc_get_next(seq
, v
);
2688 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2691 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2693 state
->in_dev
= NULL
;
2698 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2700 if (v
== SEQ_START_TOKEN
)
2702 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2704 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2705 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2709 #ifdef CONFIG_IP_MULTICAST
2710 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2711 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2717 if (rcu_access_pointer(state
->in_dev
->mc_list
) == im
) {
2718 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2719 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2722 delta
= im
->timer
.expires
- jiffies
;
2724 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2725 im
->multiaddr
, im
->users
,
2727 im
->tm_running
? jiffies_delta_to_clock_t(delta
) : 0,
2733 static const struct seq_operations igmp_mc_seq_ops
= {
2734 .start
= igmp_mc_seq_start
,
2735 .next
= igmp_mc_seq_next
,
2736 .stop
= igmp_mc_seq_stop
,
2737 .show
= igmp_mc_seq_show
,
2740 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2742 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2743 sizeof(struct igmp_mc_iter_state
));
2746 static const struct file_operations igmp_mc_seq_fops
= {
2747 .owner
= THIS_MODULE
,
2748 .open
= igmp_mc_seq_open
,
2750 .llseek
= seq_lseek
,
2751 .release
= seq_release_net
,
2754 struct igmp_mcf_iter_state
{
2755 struct seq_net_private p
;
2756 struct net_device
*dev
;
2757 struct in_device
*idev
;
2758 struct ip_mc_list
*im
;
2761 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2763 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2765 struct net
*net
= seq_file_net(seq
);
2766 struct ip_sf_list
*psf
= NULL
;
2767 struct ip_mc_list
*im
= NULL
;
2768 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2772 for_each_netdev_rcu(net
, state
->dev
) {
2773 struct in_device
*idev
;
2774 idev
= __in_dev_get_rcu(state
->dev
);
2775 if (unlikely(!idev
))
2777 im
= rcu_dereference(idev
->mc_list
);
2779 spin_lock_bh(&im
->lock
);
2786 spin_unlock_bh(&im
->lock
);
2792 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2794 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2798 spin_unlock_bh(&state
->im
->lock
);
2799 state
->im
= state
->im
->next
;
2800 while (!state
->im
) {
2801 state
->dev
= next_net_device_rcu(state
->dev
);
2806 state
->idev
= __in_dev_get_rcu(state
->dev
);
2809 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2813 spin_lock_bh(&state
->im
->lock
);
2814 psf
= state
->im
->sources
;
2820 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2822 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2824 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2826 return pos
? NULL
: psf
;
2829 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2833 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2836 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2838 struct ip_sf_list
*psf
;
2839 if (v
== SEQ_START_TOKEN
)
2840 psf
= igmp_mcf_get_first(seq
);
2842 psf
= igmp_mcf_get_next(seq
, v
);
2847 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2850 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2851 if (likely(state
->im
)) {
2852 spin_unlock_bh(&state
->im
->lock
);
2860 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2862 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2863 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2865 if (v
== SEQ_START_TOKEN
) {
2866 seq_puts(seq
, "Idx Device MCA SRC INC EXC\n");
2870 "0x%08x %6lu %6lu\n",
2871 state
->dev
->ifindex
, state
->dev
->name
,
2872 ntohl(state
->im
->multiaddr
),
2873 ntohl(psf
->sf_inaddr
),
2874 psf
->sf_count
[MCAST_INCLUDE
],
2875 psf
->sf_count
[MCAST_EXCLUDE
]);
2880 static const struct seq_operations igmp_mcf_seq_ops
= {
2881 .start
= igmp_mcf_seq_start
,
2882 .next
= igmp_mcf_seq_next
,
2883 .stop
= igmp_mcf_seq_stop
,
2884 .show
= igmp_mcf_seq_show
,
2887 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2889 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2890 sizeof(struct igmp_mcf_iter_state
));
2893 static const struct file_operations igmp_mcf_seq_fops
= {
2894 .owner
= THIS_MODULE
,
2895 .open
= igmp_mcf_seq_open
,
2897 .llseek
= seq_lseek
,
2898 .release
= seq_release_net
,
2901 static int __net_init
igmp_net_init(struct net
*net
)
2903 struct proc_dir_entry
*pde
;
2906 pde
= proc_create("igmp", S_IRUGO
, net
->proc_net
, &igmp_mc_seq_fops
);
2909 pde
= proc_create("mcfilter", S_IRUGO
, net
->proc_net
,
2910 &igmp_mcf_seq_fops
);
2913 err
= inet_ctl_sock_create(&net
->ipv4
.mc_autojoin_sk
, AF_INET
,
2914 SOCK_DGRAM
, 0, net
);
2916 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2924 remove_proc_entry("mcfilter", net
->proc_net
);
2926 remove_proc_entry("igmp", net
->proc_net
);
2931 static void __net_exit
igmp_net_exit(struct net
*net
)
2933 remove_proc_entry("mcfilter", net
->proc_net
);
2934 remove_proc_entry("igmp", net
->proc_net
);
2935 inet_ctl_sock_destroy(net
->ipv4
.mc_autojoin_sk
);
2938 static struct pernet_operations igmp_net_ops
= {
2939 .init
= igmp_net_init
,
2940 .exit
= igmp_net_exit
,
2944 static int igmp_netdev_event(struct notifier_block
*this,
2945 unsigned long event
, void *ptr
)
2947 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
2948 struct in_device
*in_dev
;
2951 case NETDEV_RESEND_IGMP
:
2952 in_dev
= __in_dev_get_rtnl(dev
);
2954 ip_mc_rejoin_groups(in_dev
);
2962 static struct notifier_block igmp_notifier
= {
2963 .notifier_call
= igmp_netdev_event
,
2966 int __init
igmp_mc_init(void)
2968 #if defined(CONFIG_PROC_FS)
2971 err
= register_pernet_subsys(&igmp_net_ops
);
2974 err
= register_netdevice_notifier(&igmp_notifier
);
2976 goto reg_notif_fail
;
2980 unregister_pernet_subsys(&igmp_net_ops
);
2983 return register_netdevice_notifier(&igmp_notifier
);