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 <linux/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>
92 #include <linux/byteorder/generic.h>
94 #include <net/net_namespace.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
100 #include <net/checksum.h>
101 #include <net/inet_common.h>
102 #include <linux/netfilter_ipv4.h>
103 #ifdef CONFIG_IP_MROUTE
104 #include <linux/mroute.h>
106 #ifdef CONFIG_PROC_FS
107 #include <linux/proc_fs.h>
108 #include <linux/seq_file.h>
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_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
117 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
118 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
119 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
122 #define IGMP_INITIAL_REPORT_DELAY (1)
124 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
131 #define IGMP_V1_SEEN(in_dev) \
132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136 #define IGMP_V2_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139 ((in_dev)->mr_v2_seen && \
140 time_before(jiffies, (in_dev)->mr_v2_seen)))
142 static int unsolicited_report_interval(struct in_device
*in_dev
)
144 int interval_ms
, interval_jiffies
;
146 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
147 interval_ms
= IN_DEV_CONF_GET(
149 IGMPV2_UNSOLICITED_REPORT_INTERVAL
);
151 interval_ms
= IN_DEV_CONF_GET(
153 IGMPV3_UNSOLICITED_REPORT_INTERVAL
);
155 interval_jiffies
= msecs_to_jiffies(interval_ms
);
157 /* _timer functions can't handle a delay of 0 jiffies so ensure
158 * we always return a positive value.
160 if (interval_jiffies
<= 0)
161 interval_jiffies
= 1;
162 return interval_jiffies
;
165 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
166 static void igmpv3_del_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
167 static void igmpv3_clear_delrec(struct in_device
*in_dev
);
168 static int sf_setstate(struct ip_mc_list
*pmc
);
169 static void sf_markstate(struct ip_mc_list
*pmc
);
171 static void ip_mc_clear_src(struct ip_mc_list
*pmc
);
172 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
173 int sfcount
, __be32
*psfsrc
, int delta
);
175 static void ip_ma_put(struct ip_mc_list
*im
)
177 if (refcount_dec_and_test(&im
->refcnt
)) {
178 in_dev_put(im
->interface
);
183 #define for_each_pmc_rcu(in_dev, pmc) \
184 for (pmc = rcu_dereference(in_dev->mc_list); \
186 pmc = rcu_dereference(pmc->next_rcu))
188 #define for_each_pmc_rtnl(in_dev, pmc) \
189 for (pmc = rtnl_dereference(in_dev->mc_list); \
191 pmc = rtnl_dereference(pmc->next_rcu))
193 #ifdef CONFIG_IP_MULTICAST
199 static void igmp_stop_timer(struct ip_mc_list
*im
)
201 spin_lock_bh(&im
->lock
);
202 if (del_timer(&im
->timer
))
203 refcount_dec(&im
->refcnt
);
206 im
->unsolicit_count
= 0;
207 spin_unlock_bh(&im
->lock
);
210 /* It must be called with locked im->lock */
211 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
213 int tv
= prandom_u32() % max_delay
;
216 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
217 refcount_inc(&im
->refcnt
);
220 static void igmp_gq_start_timer(struct in_device
*in_dev
)
222 int tv
= prandom_u32() % in_dev
->mr_maxdelay
;
223 unsigned long exp
= jiffies
+ tv
+ 2;
225 if (in_dev
->mr_gq_running
&&
226 time_after_eq(exp
, (in_dev
->mr_gq_timer
).expires
))
229 in_dev
->mr_gq_running
= 1;
230 if (!mod_timer(&in_dev
->mr_gq_timer
, exp
))
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 refcount_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 /* source address selection per RFC 3376 section 4.2.13 */
326 static __be32
igmpv3_get_srcaddr(struct net_device
*dev
,
327 const struct flowi4
*fl4
)
329 struct in_device
*in_dev
= __in_dev_get_rcu(dev
);
332 return htonl(INADDR_ANY
);
335 if (fl4
->saddr
== ifa
->ifa_local
)
337 } endfor_ifa(in_dev
);
339 return htonl(INADDR_ANY
);
342 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, unsigned int mtu
)
347 struct igmpv3_report
*pig
;
348 struct net
*net
= dev_net(dev
);
350 int hlen
= LL_RESERVED_SPACE(dev
);
351 int tlen
= dev
->needed_tailroom
;
352 unsigned int size
= mtu
;
355 skb
= alloc_skb(size
+ hlen
+ tlen
,
356 GFP_ATOMIC
| __GFP_NOWARN
);
363 skb
->priority
= TC_PRIO_CONTROL
;
365 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
367 IPPROTO_IGMP
, 0, dev
->ifindex
);
373 skb_dst_set(skb
, &rt
->dst
);
376 skb_reserve(skb
, hlen
);
377 skb_tailroom_reserve(skb
, mtu
, tlen
);
379 skb_reset_network_header(skb
);
381 skb_put(skb
, sizeof(struct iphdr
) + 4);
384 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
386 pip
->frag_off
= htons(IP_DF
);
388 pip
->daddr
= fl4
.daddr
;
391 pip
->saddr
= igmpv3_get_srcaddr(dev
, &fl4
);
394 pip
->protocol
= IPPROTO_IGMP
;
395 pip
->tot_len
= 0; /* filled in later */
396 ip_select_ident(net
, skb
, NULL
);
397 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
398 ((u8
*)&pip
[1])[1] = 4;
399 ((u8
*)&pip
[1])[2] = 0;
400 ((u8
*)&pip
[1])[3] = 0;
402 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
403 skb_put(skb
, sizeof(*pig
));
404 pig
= igmpv3_report_hdr(skb
);
405 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
413 static int igmpv3_sendpack(struct sk_buff
*skb
)
415 struct igmphdr
*pig
= igmp_hdr(skb
);
416 const int igmplen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
418 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
420 return ip_local_out(dev_net(skb_dst(skb
)->dev
), skb
->sk
, skb
);
423 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
425 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
428 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
429 int type
, struct igmpv3_grec
**ppgr
, unsigned int mtu
)
431 struct net_device
*dev
= pmc
->interface
->dev
;
432 struct igmpv3_report
*pih
;
433 struct igmpv3_grec
*pgr
;
436 skb
= igmpv3_newpack(dev
, mtu
);
440 pgr
= skb_put(skb
, sizeof(struct igmpv3_grec
));
441 pgr
->grec_type
= type
;
442 pgr
->grec_auxwords
= 0;
444 pgr
->grec_mca
= pmc
->multiaddr
;
445 pih
= igmpv3_report_hdr(skb
);
446 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
451 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
453 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
454 int type
, int gdeleted
, int sdeleted
)
456 struct net_device
*dev
= pmc
->interface
->dev
;
457 struct net
*net
= dev_net(dev
);
458 struct igmpv3_report
*pih
;
459 struct igmpv3_grec
*pgr
= NULL
;
460 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
461 int scount
, stotal
, first
, isquery
, truncate
;
464 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
466 if (ipv4_is_local_multicast(pmc
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
469 mtu
= READ_ONCE(dev
->mtu
);
470 if (mtu
< IPV4_MIN_MTU
)
473 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
474 type
== IGMPV3_MODE_IS_EXCLUDE
;
475 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
476 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
480 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
485 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
487 /* EX and TO_EX get a fresh packet, if needed */
489 if (pih
&& pih
->ngrec
&&
490 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
492 igmpv3_sendpack(skb
);
493 skb
= igmpv3_newpack(dev
, mtu
);
498 for (psf
= *psf_list
; psf
; psf
= psf_next
) {
501 psf_next
= psf
->sf_next
;
503 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
508 /* Based on RFC3376 5.1. Should not send source-list change
509 * records when there is a filter mode change.
511 if (((gdeleted
&& pmc
->sfmode
== MCAST_EXCLUDE
) ||
512 (!gdeleted
&& pmc
->crcount
)) &&
513 (type
== IGMPV3_ALLOW_NEW_SOURCES
||
514 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
)
515 goto decrease_sf_crcount
;
517 /* clear marks on query responses */
521 if (AVAILABLE(skb
) < sizeof(__be32
) +
522 first
*sizeof(struct igmpv3_grec
)) {
523 if (truncate
&& !first
)
524 break; /* truncate these */
526 pgr
->grec_nsrcs
= htons(scount
);
528 igmpv3_sendpack(skb
);
529 skb
= igmpv3_newpack(dev
, mtu
);
534 skb
= add_grhead(skb
, pmc
, type
, &pgr
, mtu
);
539 psrc
= skb_put(skb
, sizeof(__be32
));
540 *psrc
= psf
->sf_inaddr
;
542 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
543 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
546 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
548 psf_prev
->sf_next
= psf
->sf_next
;
550 *psf_list
= psf
->sf_next
;
560 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
561 type
== IGMPV3_BLOCK_OLD_SOURCES
)
563 if (pmc
->crcount
|| isquery
) {
564 /* make sure we have room for group header */
565 if (skb
&& AVAILABLE(skb
) < sizeof(struct igmpv3_grec
)) {
566 igmpv3_sendpack(skb
);
567 skb
= NULL
; /* add_grhead will get a new one */
569 skb
= add_grhead(skb
, pmc
, type
, &pgr
, mtu
);
573 pgr
->grec_nsrcs
= htons(scount
);
576 pmc
->gsquery
= 0; /* clear query state on report */
580 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
582 struct sk_buff
*skb
= NULL
;
583 struct net
*net
= dev_net(in_dev
->dev
);
588 for_each_pmc_rcu(in_dev
, pmc
) {
589 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
591 if (ipv4_is_local_multicast(pmc
->multiaddr
) &&
592 !net
->ipv4
.sysctl_igmp_llm_reports
)
594 spin_lock_bh(&pmc
->lock
);
595 if (pmc
->sfcount
[MCAST_EXCLUDE
])
596 type
= IGMPV3_MODE_IS_EXCLUDE
;
598 type
= IGMPV3_MODE_IS_INCLUDE
;
599 skb
= add_grec(skb
, pmc
, type
, 0, 0);
600 spin_unlock_bh(&pmc
->lock
);
604 spin_lock_bh(&pmc
->lock
);
605 if (pmc
->sfcount
[MCAST_EXCLUDE
])
606 type
= IGMPV3_MODE_IS_EXCLUDE
;
608 type
= IGMPV3_MODE_IS_INCLUDE
;
609 skb
= add_grec(skb
, pmc
, type
, 0, 0);
610 spin_unlock_bh(&pmc
->lock
);
614 return igmpv3_sendpack(skb
);
618 * remove zero-count source records from a source filter list
620 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
622 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
625 for (psf
= *ppsf
; psf
; psf
= psf_next
) {
626 psf_next
= psf
->sf_next
;
627 if (psf
->sf_crcount
== 0) {
629 psf_prev
->sf_next
= psf
->sf_next
;
631 *ppsf
= psf
->sf_next
;
638 static void igmpv3_send_cr(struct in_device
*in_dev
)
640 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
641 struct sk_buff
*skb
= NULL
;
645 spin_lock_bh(&in_dev
->mc_tomb_lock
);
649 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc_next
) {
650 pmc_next
= pmc
->next
;
651 if (pmc
->sfmode
== MCAST_INCLUDE
) {
652 type
= IGMPV3_BLOCK_OLD_SOURCES
;
653 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
654 skb
= add_grec(skb
, pmc
, type
, 1, 0);
655 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
658 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
659 type
= IGMPV3_CHANGE_TO_INCLUDE
;
660 skb
= add_grec(skb
, pmc
, type
, 1, 0);
663 if (pmc
->crcount
== 0) {
664 igmpv3_clear_zeros(&pmc
->tomb
);
665 igmpv3_clear_zeros(&pmc
->sources
);
668 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
670 pmc_prev
->next
= pmc_next
;
672 in_dev
->mc_tomb
= pmc_next
;
673 in_dev_put(pmc
->interface
);
678 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
681 for_each_pmc_rcu(in_dev
, pmc
) {
682 spin_lock_bh(&pmc
->lock
);
683 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
684 type
= IGMPV3_BLOCK_OLD_SOURCES
;
685 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
687 type
= IGMPV3_ALLOW_NEW_SOURCES
;
688 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
690 skb
= add_grec(skb
, pmc
, type
, 0, 0);
691 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
693 /* filter mode changes */
695 if (pmc
->sfmode
== MCAST_EXCLUDE
)
696 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
698 type
= IGMPV3_CHANGE_TO_INCLUDE
;
699 skb
= add_grec(skb
, pmc
, type
, 0, 0);
702 spin_unlock_bh(&pmc
->lock
);
708 (void) igmpv3_sendpack(skb
);
711 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
718 struct net_device
*dev
= in_dev
->dev
;
719 struct net
*net
= dev_net(dev
);
720 __be32 group
= pmc
? pmc
->multiaddr
: 0;
725 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
726 return igmpv3_send_report(in_dev
, pmc
);
728 if (ipv4_is_local_multicast(group
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
731 if (type
== IGMP_HOST_LEAVE_MESSAGE
)
732 dst
= IGMP_ALL_ROUTER
;
736 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
738 IPPROTO_IGMP
, 0, dev
->ifindex
);
742 hlen
= LL_RESERVED_SPACE(dev
);
743 tlen
= dev
->needed_tailroom
;
744 skb
= alloc_skb(IGMP_SIZE
+ hlen
+ tlen
, GFP_ATOMIC
);
749 skb
->priority
= TC_PRIO_CONTROL
;
751 skb_dst_set(skb
, &rt
->dst
);
753 skb_reserve(skb
, hlen
);
755 skb_reset_network_header(skb
);
757 skb_put(skb
, sizeof(struct iphdr
) + 4);
760 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
762 iph
->frag_off
= htons(IP_DF
);
765 iph
->saddr
= fl4
.saddr
;
766 iph
->protocol
= IPPROTO_IGMP
;
767 ip_select_ident(net
, skb
, NULL
);
768 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
769 ((u8
*)&iph
[1])[1] = 4;
770 ((u8
*)&iph
[1])[2] = 0;
771 ((u8
*)&iph
[1])[3] = 0;
773 ih
= skb_put(skb
, sizeof(struct igmphdr
));
778 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
780 return ip_local_out(net
, skb
->sk
, skb
);
783 static void igmp_gq_timer_expire(struct timer_list
*t
)
785 struct in_device
*in_dev
= from_timer(in_dev
, t
, mr_gq_timer
);
787 in_dev
->mr_gq_running
= 0;
788 igmpv3_send_report(in_dev
, NULL
);
792 static void igmp_ifc_timer_expire(struct timer_list
*t
)
794 struct in_device
*in_dev
= from_timer(in_dev
, t
, mr_ifc_timer
);
796 igmpv3_send_cr(in_dev
);
797 if (in_dev
->mr_ifc_count
) {
798 in_dev
->mr_ifc_count
--;
799 igmp_ifc_start_timer(in_dev
,
800 unsolicited_report_interval(in_dev
));
805 static void igmp_ifc_event(struct in_device
*in_dev
)
807 struct net
*net
= dev_net(in_dev
->dev
);
808 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
810 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
811 igmp_ifc_start_timer(in_dev
, 1);
815 static void igmp_timer_expire(struct timer_list
*t
)
817 struct ip_mc_list
*im
= from_timer(im
, t
, timer
);
818 struct in_device
*in_dev
= im
->interface
;
820 spin_lock(&im
->lock
);
823 if (im
->unsolicit_count
) {
824 im
->unsolicit_count
--;
825 igmp_start_timer(im
, unsolicited_report_interval(in_dev
));
828 spin_unlock(&im
->lock
);
830 if (IGMP_V1_SEEN(in_dev
))
831 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
832 else if (IGMP_V2_SEEN(in_dev
))
833 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
835 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
840 /* mark EXCLUDE-mode sources */
841 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
843 struct ip_sf_list
*psf
;
847 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
850 for (i
= 0; i
< nsrcs
; i
++) {
851 /* skip inactive filters */
852 if (psf
->sf_count
[MCAST_INCLUDE
] ||
853 pmc
->sfcount
[MCAST_EXCLUDE
] !=
854 psf
->sf_count
[MCAST_EXCLUDE
])
856 if (srcs
[i
] == psf
->sf_inaddr
) {
863 if (scount
== nsrcs
) /* all sources excluded */
868 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
870 struct ip_sf_list
*psf
;
873 if (pmc
->sfmode
== MCAST_EXCLUDE
)
874 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
876 /* mark INCLUDE-mode sources */
878 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
881 for (i
= 0; i
< nsrcs
; i
++)
882 if (srcs
[i
] == psf
->sf_inaddr
) {
896 /* return true if packet was dropped */
897 static bool igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
899 struct ip_mc_list
*im
;
900 struct net
*net
= dev_net(in_dev
->dev
);
902 /* Timers are only set for non-local groups */
904 if (group
== IGMP_ALL_HOSTS
)
906 if (ipv4_is_local_multicast(group
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
910 for_each_pmc_rcu(in_dev
, im
) {
911 if (im
->multiaddr
== group
) {
920 /* return true if packet was dropped */
921 static bool igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
924 struct igmphdr
*ih
= igmp_hdr(skb
);
925 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
926 struct ip_mc_list
*im
;
927 __be32 group
= ih
->group
;
930 struct net
*net
= dev_net(in_dev
->dev
);
935 /* Alas, old v1 router presents here. */
937 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
938 in_dev
->mr_v1_seen
= jiffies
+
939 IGMP_V1_ROUTER_PRESENT_TIMEOUT
;
942 /* v2 router present */
943 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
944 in_dev
->mr_v2_seen
= jiffies
+
945 IGMP_V2_ROUTER_PRESENT_TIMEOUT
;
947 /* cancel the interface change timer */
948 in_dev
->mr_ifc_count
= 0;
949 if (del_timer(&in_dev
->mr_ifc_timer
))
950 __in_dev_put(in_dev
);
951 /* clear deleted report items */
952 igmpv3_clear_delrec(in_dev
);
953 } else if (len
< 12) {
954 return true; /* ignore bogus packet; freed by caller */
955 } else if (IGMP_V1_SEEN(in_dev
)) {
956 /* This is a v3 query with v1 queriers present */
957 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
959 } else if (IGMP_V2_SEEN(in_dev
)) {
960 /* this is a v3 query with v2 queriers present;
961 * Interpretation of the max_delay code is problematic here.
962 * A real v2 host would use ih_code directly, while v3 has a
963 * different encoding. We use the v3 encoding as more likely
964 * to be intended in a v3 query.
966 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
968 max_delay
= 1; /* can't mod w/ 0 */
970 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
973 ih3
= igmpv3_query_hdr(skb
);
975 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
976 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
978 ih3
= igmpv3_query_hdr(skb
);
981 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
983 max_delay
= 1; /* can't mod w/ 0 */
984 in_dev
->mr_maxdelay
= max_delay
;
986 in_dev
->mr_qrv
= ih3
->qrv
;
987 if (!group
) { /* general query */
989 return true; /* no sources allowed */
990 igmp_gq_start_timer(in_dev
);
993 /* mark sources to include, if group & source-specific */
994 mark
= ih3
->nsrcs
!= 0;
998 * - Start the timers in all of our membership records
999 * that the query applies to for the interface on
1000 * which the query arrived excl. those that belong
1001 * to a "local" group (224.0.0.X)
1002 * - For timers already running check if they need to
1004 * - Use the igmp->igmp_code field as the maximum
1008 for_each_pmc_rcu(in_dev
, im
) {
1011 if (group
&& group
!= im
->multiaddr
)
1013 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1015 if (ipv4_is_local_multicast(im
->multiaddr
) &&
1016 !net
->ipv4
.sysctl_igmp_llm_reports
)
1018 spin_lock_bh(&im
->lock
);
1020 im
->gsquery
= im
->gsquery
&& mark
;
1023 changed
= !im
->gsquery
||
1024 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
1025 spin_unlock_bh(&im
->lock
);
1027 igmp_mod_timer(im
, max_delay
);
1033 /* called in rcu_read_lock() section */
1034 int igmp_rcv(struct sk_buff
*skb
)
1036 /* This basically follows the spec line by line -- see RFC1112 */
1038 struct net_device
*dev
= skb
->dev
;
1039 struct in_device
*in_dev
;
1041 bool dropped
= true;
1043 if (netif_is_l3_master(dev
)) {
1044 dev
= dev_get_by_index_rcu(dev_net(dev
), IPCB(skb
)->iif
);
1049 in_dev
= __in_dev_get_rcu(dev
);
1053 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
1056 if (skb_checksum_simple_validate(skb
))
1061 case IGMP_HOST_MEMBERSHIP_QUERY
:
1062 dropped
= igmp_heard_query(in_dev
, skb
, len
);
1064 case IGMP_HOST_MEMBERSHIP_REPORT
:
1065 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1066 /* Is it our report looped back? */
1067 if (rt_is_output_route(skb_rtable(skb
)))
1069 /* don't rely on MC router hearing unicast reports */
1070 if (skb
->pkt_type
== PACKET_MULTICAST
||
1071 skb
->pkt_type
== PACKET_BROADCAST
)
1072 dropped
= igmp_heard_report(in_dev
, ih
->group
);
1075 #ifdef CONFIG_IP_PIMSM_V1
1076 return pim_rcv_v1(skb
);
1078 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1081 case IGMP_HOST_LEAVE_MESSAGE
:
1083 case IGMP_MTRACE_RESP
:
1101 * Add a filter to a device
1104 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1106 char buf
[MAX_ADDR_LEN
];
1107 struct net_device
*dev
= in_dev
->dev
;
1109 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1110 We will get multicast token leakage, when IFF_MULTICAST
1111 is changed. This check should be done in ndo_set_rx_mode
1112 routine. Something sort of:
1113 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1116 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1117 dev_mc_add(dev
, buf
);
1121 * Remove a filter from a device
1124 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1126 char buf
[MAX_ADDR_LEN
];
1127 struct net_device
*dev
= in_dev
->dev
;
1129 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1130 dev_mc_del(dev
, buf
);
1133 #ifdef CONFIG_IP_MULTICAST
1135 * deleted ip_mc_list manipulation
1137 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1139 struct ip_mc_list
*pmc
;
1140 struct net
*net
= dev_net(in_dev
->dev
);
1142 /* this is an "ip_mc_list" for convenience; only the fields below
1143 * are actually used. In particular, the refcnt and users are not
1144 * used for management of the delete list. Using the same structure
1145 * for deleted items allows change reports to use common code with
1146 * non-deleted or query-response MCA's.
1148 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1151 spin_lock_init(&pmc
->lock
);
1152 spin_lock_bh(&im
->lock
);
1153 pmc
->interface
= im
->interface
;
1154 in_dev_hold(in_dev
);
1155 pmc
->multiaddr
= im
->multiaddr
;
1156 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1157 pmc
->sfmode
= im
->sfmode
;
1158 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1159 struct ip_sf_list
*psf
;
1161 pmc
->tomb
= im
->tomb
;
1162 pmc
->sources
= im
->sources
;
1163 im
->tomb
= im
->sources
= NULL
;
1164 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1165 psf
->sf_crcount
= pmc
->crcount
;
1167 spin_unlock_bh(&im
->lock
);
1169 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1170 pmc
->next
= in_dev
->mc_tomb
;
1171 in_dev
->mc_tomb
= pmc
;
1172 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1176 * restore ip_mc_list deleted records
1178 static void igmpv3_del_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1180 struct ip_mc_list
*pmc
, *pmc_prev
;
1181 struct ip_sf_list
*psf
;
1182 struct net
*net
= dev_net(in_dev
->dev
);
1183 __be32 multiaddr
= im
->multiaddr
;
1185 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1187 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc
->next
) {
1188 if (pmc
->multiaddr
== multiaddr
)
1194 pmc_prev
->next
= pmc
->next
;
1196 in_dev
->mc_tomb
= pmc
->next
;
1198 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1200 spin_lock_bh(&im
->lock
);
1202 im
->interface
= pmc
->interface
;
1203 im
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1204 if (im
->sfmode
== MCAST_INCLUDE
) {
1205 im
->tomb
= pmc
->tomb
;
1206 im
->sources
= pmc
->sources
;
1207 for (psf
= im
->sources
; psf
; psf
= psf
->sf_next
)
1208 psf
->sf_crcount
= im
->crcount
;
1210 in_dev_put(pmc
->interface
);
1213 spin_unlock_bh(&im
->lock
);
1217 * flush ip_mc_list deleted records
1219 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1221 struct ip_mc_list
*pmc
, *nextpmc
;
1223 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1224 pmc
= in_dev
->mc_tomb
;
1225 in_dev
->mc_tomb
= NULL
;
1226 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1228 for (; pmc
; pmc
= nextpmc
) {
1229 nextpmc
= pmc
->next
;
1230 ip_mc_clear_src(pmc
);
1231 in_dev_put(pmc
->interface
);
1234 /* clear dead sources, too */
1236 for_each_pmc_rcu(in_dev
, pmc
) {
1237 struct ip_sf_list
*psf
, *psf_next
;
1239 spin_lock_bh(&pmc
->lock
);
1242 spin_unlock_bh(&pmc
->lock
);
1243 for (; psf
; psf
= psf_next
) {
1244 psf_next
= psf
->sf_next
;
1252 static void igmp_group_dropped(struct ip_mc_list
*im
)
1254 struct in_device
*in_dev
= im
->interface
;
1255 #ifdef CONFIG_IP_MULTICAST
1256 struct net
*net
= dev_net(in_dev
->dev
);
1262 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1265 #ifdef CONFIG_IP_MULTICAST
1266 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1268 if (ipv4_is_local_multicast(im
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
1271 reporter
= im
->reporter
;
1272 igmp_stop_timer(im
);
1274 if (!in_dev
->dead
) {
1275 if (IGMP_V1_SEEN(in_dev
))
1277 if (IGMP_V2_SEEN(in_dev
)) {
1279 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1283 igmpv3_add_delrec(in_dev
, im
);
1285 igmp_ifc_event(in_dev
);
1290 static void igmp_group_added(struct ip_mc_list
*im
)
1292 struct in_device
*in_dev
= im
->interface
;
1293 #ifdef CONFIG_IP_MULTICAST
1294 struct net
*net
= dev_net(in_dev
->dev
);
1297 if (im
->loaded
== 0) {
1299 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1302 #ifdef CONFIG_IP_MULTICAST
1303 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1305 if (ipv4_is_local_multicast(im
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
1310 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1311 spin_lock_bh(&im
->lock
);
1312 igmp_start_timer(im
, IGMP_INITIAL_REPORT_DELAY
);
1313 spin_unlock_bh(&im
->lock
);
1318 im
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1319 igmp_ifc_event(in_dev
);
1325 * Multicast list managers
1328 static u32
ip_mc_hash(const struct ip_mc_list
*im
)
1330 return hash_32((__force u32
)im
->multiaddr
, MC_HASH_SZ_LOG
);
1333 static void ip_mc_hash_add(struct in_device
*in_dev
,
1334 struct ip_mc_list
*im
)
1336 struct ip_mc_list __rcu
**mc_hash
;
1339 mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1341 hash
= ip_mc_hash(im
);
1342 im
->next_hash
= mc_hash
[hash
];
1343 rcu_assign_pointer(mc_hash
[hash
], im
);
1347 /* do not use a hash table for small number of items */
1348 if (in_dev
->mc_count
< 4)
1351 mc_hash
= kzalloc(sizeof(struct ip_mc_list
*) << MC_HASH_SZ_LOG
,
1356 for_each_pmc_rtnl(in_dev
, im
) {
1357 hash
= ip_mc_hash(im
);
1358 im
->next_hash
= mc_hash
[hash
];
1359 RCU_INIT_POINTER(mc_hash
[hash
], im
);
1362 rcu_assign_pointer(in_dev
->mc_hash
, mc_hash
);
1365 static void ip_mc_hash_remove(struct in_device
*in_dev
,
1366 struct ip_mc_list
*im
)
1368 struct ip_mc_list __rcu
**mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1369 struct ip_mc_list
*aux
;
1373 mc_hash
+= ip_mc_hash(im
);
1374 while ((aux
= rtnl_dereference(*mc_hash
)) != im
)
1375 mc_hash
= &aux
->next_hash
;
1376 *mc_hash
= im
->next_hash
;
1381 * A socket has joined a multicast group on device dev.
1384 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1386 struct ip_mc_list
*im
;
1387 #ifdef CONFIG_IP_MULTICAST
1388 struct net
*net
= dev_net(in_dev
->dev
);
1393 for_each_pmc_rtnl(in_dev
, im
) {
1394 if (im
->multiaddr
== addr
) {
1396 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1401 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1406 im
->interface
= in_dev
;
1407 in_dev_hold(in_dev
);
1408 im
->multiaddr
= addr
;
1409 /* initial mode is (EX, empty) */
1410 im
->sfmode
= MCAST_EXCLUDE
;
1411 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1412 refcount_set(&im
->refcnt
, 1);
1413 spin_lock_init(&im
->lock
);
1414 #ifdef CONFIG_IP_MULTICAST
1415 timer_setup(&im
->timer
, igmp_timer_expire
, 0);
1416 im
->unsolicit_count
= net
->ipv4
.sysctl_igmp_qrv
;
1419 im
->next_rcu
= in_dev
->mc_list
;
1421 rcu_assign_pointer(in_dev
->mc_list
, im
);
1423 ip_mc_hash_add(in_dev
, im
);
1425 #ifdef CONFIG_IP_MULTICAST
1426 igmpv3_del_delrec(in_dev
, im
);
1428 igmp_group_added(im
);
1430 ip_rt_multicast_event(in_dev
);
1434 EXPORT_SYMBOL(ip_mc_inc_group
);
1436 static int ip_mc_check_iphdr(struct sk_buff
*skb
)
1438 const struct iphdr
*iph
;
1440 unsigned int offset
= skb_network_offset(skb
) + sizeof(*iph
);
1442 if (!pskb_may_pull(skb
, offset
))
1447 if (iph
->version
!= 4 || ip_hdrlen(skb
) < sizeof(*iph
))
1450 offset
+= ip_hdrlen(skb
) - sizeof(*iph
);
1452 if (!pskb_may_pull(skb
, offset
))
1457 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1460 len
= skb_network_offset(skb
) + ntohs(iph
->tot_len
);
1461 if (skb
->len
< len
|| len
< offset
)
1464 skb_set_transport_header(skb
, offset
);
1469 static int ip_mc_check_igmp_reportv3(struct sk_buff
*skb
)
1471 unsigned int len
= skb_transport_offset(skb
);
1473 len
+= sizeof(struct igmpv3_report
);
1475 return pskb_may_pull(skb
, len
) ? 0 : -EINVAL
;
1478 static int ip_mc_check_igmp_query(struct sk_buff
*skb
)
1480 unsigned int len
= skb_transport_offset(skb
);
1482 len
+= sizeof(struct igmphdr
);
1487 if (skb
->len
!= len
) {
1489 len
+= sizeof(struct igmpv3_query
) - sizeof(struct igmphdr
);
1490 if (skb
->len
< len
|| !pskb_may_pull(skb
, len
))
1494 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1495 * all-systems destination addresses (224.0.0.1) for general queries
1497 if (!igmp_hdr(skb
)->group
&&
1498 ip_hdr(skb
)->daddr
!= htonl(INADDR_ALLHOSTS_GROUP
))
1504 static int ip_mc_check_igmp_msg(struct sk_buff
*skb
)
1506 switch (igmp_hdr(skb
)->type
) {
1507 case IGMP_HOST_LEAVE_MESSAGE
:
1508 case IGMP_HOST_MEMBERSHIP_REPORT
:
1509 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1512 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1513 return ip_mc_check_igmp_reportv3(skb
);
1514 case IGMP_HOST_MEMBERSHIP_QUERY
:
1515 return ip_mc_check_igmp_query(skb
);
1521 static inline __sum16
ip_mc_validate_checksum(struct sk_buff
*skb
)
1523 return skb_checksum_simple_validate(skb
);
1526 static int __ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1529 struct sk_buff
*skb_chk
;
1530 unsigned int transport_len
;
1531 unsigned int len
= skb_transport_offset(skb
) + sizeof(struct igmphdr
);
1534 transport_len
= ntohs(ip_hdr(skb
)->tot_len
) - ip_hdrlen(skb
);
1536 skb_chk
= skb_checksum_trimmed(skb
, transport_len
,
1537 ip_mc_validate_checksum
);
1541 if (!pskb_may_pull(skb_chk
, len
))
1544 ret
= ip_mc_check_igmp_msg(skb_chk
);
1549 *skb_trimmed
= skb_chk
;
1550 /* free now unneeded clone */
1551 else if (skb_chk
!= skb
)
1557 if (ret
&& skb_chk
&& skb_chk
!= skb
)
1564 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1565 * @skb: the skb to validate
1566 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1568 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1569 * skb transport header accordingly and returns zero.
1571 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1573 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1574 * -ENOMEM: A memory allocation failure happened.
1576 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1577 * to NULL): After parsing an IGMP packet successfully it will point to
1578 * an skb which has its tail aligned to the IP packet end. This might
1579 * either be the originally provided skb or a trimmed, cloned version if
1580 * the skb frame had data beyond the IP packet. A cloned skb allows us
1581 * to leave the original skb and its full frame unchanged (which might be
1582 * desirable for layer 2 frame jugglers).
1584 * Caller needs to set the skb network header and free any returned skb if it
1585 * differs from the provided skb.
1587 int ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1589 int ret
= ip_mc_check_iphdr(skb
);
1594 if (ip_hdr(skb
)->protocol
!= IPPROTO_IGMP
)
1597 return __ip_mc_check_igmp(skb
, skb_trimmed
);
1599 EXPORT_SYMBOL(ip_mc_check_igmp
);
1602 * Resend IGMP JOIN report; used by netdev notifier.
1604 static void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1606 #ifdef CONFIG_IP_MULTICAST
1607 struct ip_mc_list
*im
;
1609 struct net
*net
= dev_net(in_dev
->dev
);
1613 for_each_pmc_rtnl(in_dev
, im
) {
1614 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1616 if (ipv4_is_local_multicast(im
->multiaddr
) &&
1617 !net
->ipv4
.sysctl_igmp_llm_reports
)
1620 /* a failover is happening and switches
1621 * must be notified immediately
1623 if (IGMP_V1_SEEN(in_dev
))
1624 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1625 else if (IGMP_V2_SEEN(in_dev
))
1626 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1628 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1629 igmp_send_report(in_dev
, im
, type
);
1635 * A socket has left a multicast group on device dev
1638 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1640 struct ip_mc_list
*i
;
1641 struct ip_mc_list __rcu
**ip
;
1645 for (ip
= &in_dev
->mc_list
;
1646 (i
= rtnl_dereference(*ip
)) != NULL
;
1647 ip
= &i
->next_rcu
) {
1648 if (i
->multiaddr
== addr
) {
1649 if (--i
->users
== 0) {
1650 ip_mc_hash_remove(in_dev
, i
);
1653 igmp_group_dropped(i
);
1657 ip_rt_multicast_event(in_dev
);
1666 EXPORT_SYMBOL(ip_mc_dec_group
);
1668 /* Device changing type */
1670 void ip_mc_unmap(struct in_device
*in_dev
)
1672 struct ip_mc_list
*pmc
;
1676 for_each_pmc_rtnl(in_dev
, pmc
)
1677 igmp_group_dropped(pmc
);
1680 void ip_mc_remap(struct in_device
*in_dev
)
1682 struct ip_mc_list
*pmc
;
1686 for_each_pmc_rtnl(in_dev
, pmc
) {
1687 #ifdef CONFIG_IP_MULTICAST
1688 igmpv3_del_delrec(in_dev
, pmc
);
1690 igmp_group_added(pmc
);
1694 /* Device going down */
1696 void ip_mc_down(struct in_device
*in_dev
)
1698 struct ip_mc_list
*pmc
;
1702 for_each_pmc_rtnl(in_dev
, pmc
)
1703 igmp_group_dropped(pmc
);
1705 #ifdef CONFIG_IP_MULTICAST
1706 in_dev
->mr_ifc_count
= 0;
1707 if (del_timer(&in_dev
->mr_ifc_timer
))
1708 __in_dev_put(in_dev
);
1709 in_dev
->mr_gq_running
= 0;
1710 if (del_timer(&in_dev
->mr_gq_timer
))
1711 __in_dev_put(in_dev
);
1714 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1717 void ip_mc_init_dev(struct in_device
*in_dev
)
1719 #ifdef CONFIG_IP_MULTICAST
1720 struct net
*net
= dev_net(in_dev
->dev
);
1724 #ifdef CONFIG_IP_MULTICAST
1725 timer_setup(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
, 0);
1726 timer_setup(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
, 0);
1727 in_dev
->mr_qrv
= net
->ipv4
.sysctl_igmp_qrv
;
1730 spin_lock_init(&in_dev
->mc_tomb_lock
);
1733 /* Device going up */
1735 void ip_mc_up(struct in_device
*in_dev
)
1737 struct ip_mc_list
*pmc
;
1738 #ifdef CONFIG_IP_MULTICAST
1739 struct net
*net
= dev_net(in_dev
->dev
);
1744 #ifdef CONFIG_IP_MULTICAST
1745 in_dev
->mr_qrv
= net
->ipv4
.sysctl_igmp_qrv
;
1747 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1749 for_each_pmc_rtnl(in_dev
, pmc
) {
1750 #ifdef CONFIG_IP_MULTICAST
1751 igmpv3_del_delrec(in_dev
, pmc
);
1753 igmp_group_added(pmc
);
1758 * Device is about to be destroyed: clean up.
1761 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1763 struct ip_mc_list
*i
;
1767 /* Deactivate timers */
1769 #ifdef CONFIG_IP_MULTICAST
1770 igmpv3_clear_delrec(in_dev
);
1773 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1774 in_dev
->mc_list
= i
->next_rcu
;
1780 /* RTNL is locked */
1781 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1783 struct net_device
*dev
= NULL
;
1784 struct in_device
*idev
= NULL
;
1786 if (imr
->imr_ifindex
) {
1787 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1790 if (imr
->imr_address
.s_addr
) {
1791 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1797 struct rtable
*rt
= ip_route_output(net
,
1798 imr
->imr_multiaddr
.s_addr
,
1806 imr
->imr_ifindex
= dev
->ifindex
;
1807 idev
= __in_dev_get_rtnl(dev
);
1813 * Join a socket to a group
1816 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1819 struct ip_sf_list
*psf
, *psf_prev
;
1823 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1824 if (psf
->sf_inaddr
== *psfsrc
)
1828 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1829 /* source filter not found, or count wrong => bug */
1832 psf
->sf_count
[sfmode
]--;
1833 if (psf
->sf_count
[sfmode
] == 0) {
1834 ip_rt_multicast_event(pmc
->interface
);
1836 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1837 #ifdef CONFIG_IP_MULTICAST
1838 struct in_device
*in_dev
= pmc
->interface
;
1839 struct net
*net
= dev_net(in_dev
->dev
);
1842 /* no more filters for this source */
1844 psf_prev
->sf_next
= psf
->sf_next
;
1846 pmc
->sources
= psf
->sf_next
;
1847 #ifdef CONFIG_IP_MULTICAST
1848 if (psf
->sf_oldin
&&
1849 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1850 psf
->sf_crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1851 psf
->sf_next
= pmc
->tomb
;
1861 #ifndef CONFIG_IP_MULTICAST
1862 #define igmp_ifc_event(x) do { } while (0)
1865 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1866 int sfcount
, __be32
*psfsrc
, int delta
)
1868 struct ip_mc_list
*pmc
;
1875 for_each_pmc_rcu(in_dev
, pmc
) {
1876 if (*pmca
== pmc
->multiaddr
)
1880 /* MCA not found?? bug */
1884 spin_lock_bh(&pmc
->lock
);
1886 #ifdef CONFIG_IP_MULTICAST
1891 if (!pmc
->sfcount
[sfmode
])
1893 pmc
->sfcount
[sfmode
]--;
1896 for (i
= 0; i
< sfcount
; i
++) {
1897 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1899 changerec
|= rv
> 0;
1903 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1904 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1905 pmc
->sfcount
[MCAST_INCLUDE
]) {
1906 #ifdef CONFIG_IP_MULTICAST
1907 struct ip_sf_list
*psf
;
1908 struct net
*net
= dev_net(in_dev
->dev
);
1911 /* filter mode change */
1912 pmc
->sfmode
= MCAST_INCLUDE
;
1913 #ifdef CONFIG_IP_MULTICAST
1914 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1915 in_dev
->mr_ifc_count
= pmc
->crcount
;
1916 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1917 psf
->sf_crcount
= 0;
1918 igmp_ifc_event(pmc
->interface
);
1919 } else if (sf_setstate(pmc
) || changerec
) {
1920 igmp_ifc_event(pmc
->interface
);
1924 spin_unlock_bh(&pmc
->lock
);
1929 * Add multicast single-source filter to the interface list
1931 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1934 struct ip_sf_list
*psf
, *psf_prev
;
1937 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1938 if (psf
->sf_inaddr
== *psfsrc
)
1943 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1946 psf
->sf_inaddr
= *psfsrc
;
1948 psf_prev
->sf_next
= psf
;
1952 psf
->sf_count
[sfmode
]++;
1953 if (psf
->sf_count
[sfmode
] == 1) {
1954 ip_rt_multicast_event(pmc
->interface
);
1959 #ifdef CONFIG_IP_MULTICAST
1960 static void sf_markstate(struct ip_mc_list
*pmc
)
1962 struct ip_sf_list
*psf
;
1963 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1965 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1966 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1967 psf
->sf_oldin
= mca_xcount
==
1968 psf
->sf_count
[MCAST_EXCLUDE
] &&
1969 !psf
->sf_count
[MCAST_INCLUDE
];
1971 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1974 static int sf_setstate(struct ip_mc_list
*pmc
)
1976 struct ip_sf_list
*psf
, *dpsf
;
1977 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1978 int qrv
= pmc
->interface
->mr_qrv
;
1982 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1983 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1984 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1985 !psf
->sf_count
[MCAST_INCLUDE
];
1987 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1989 if (!psf
->sf_oldin
) {
1990 struct ip_sf_list
*prev
= NULL
;
1992 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
) {
1993 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1999 prev
->sf_next
= dpsf
->sf_next
;
2001 pmc
->tomb
= dpsf
->sf_next
;
2004 psf
->sf_crcount
= qrv
;
2007 } else if (psf
->sf_oldin
) {
2009 psf
->sf_crcount
= 0;
2011 * add or update "delete" records if an active filter
2014 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
)
2015 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
2018 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
2022 /* pmc->lock held by callers */
2023 dpsf
->sf_next
= pmc
->tomb
;
2026 dpsf
->sf_crcount
= qrv
;
2035 * Add multicast source filter list to the interface list
2037 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
2038 int sfcount
, __be32
*psfsrc
, int delta
)
2040 struct ip_mc_list
*pmc
;
2047 for_each_pmc_rcu(in_dev
, pmc
) {
2048 if (*pmca
== pmc
->multiaddr
)
2052 /* MCA not found?? bug */
2056 spin_lock_bh(&pmc
->lock
);
2059 #ifdef CONFIG_IP_MULTICAST
2062 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
2064 pmc
->sfcount
[sfmode
]++;
2066 for (i
= 0; i
< sfcount
; i
++) {
2067 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
2075 pmc
->sfcount
[sfmode
]--;
2076 for (j
= 0; j
< i
; j
++)
2077 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
2078 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
2079 #ifdef CONFIG_IP_MULTICAST
2080 struct ip_sf_list
*psf
;
2081 struct net
*net
= dev_net(pmc
->interface
->dev
);
2082 in_dev
= pmc
->interface
;
2085 /* filter mode change */
2086 if (pmc
->sfcount
[MCAST_EXCLUDE
])
2087 pmc
->sfmode
= MCAST_EXCLUDE
;
2088 else if (pmc
->sfcount
[MCAST_INCLUDE
])
2089 pmc
->sfmode
= MCAST_INCLUDE
;
2090 #ifdef CONFIG_IP_MULTICAST
2091 /* else no filters; keep old mode for reports */
2093 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
2094 in_dev
->mr_ifc_count
= pmc
->crcount
;
2095 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
2096 psf
->sf_crcount
= 0;
2097 igmp_ifc_event(in_dev
);
2098 } else if (sf_setstate(pmc
)) {
2099 igmp_ifc_event(in_dev
);
2102 spin_unlock_bh(&pmc
->lock
);
2106 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
2108 struct ip_sf_list
*psf
, *nextpsf
, *tomb
, *sources
;
2110 spin_lock_bh(&pmc
->lock
);
2113 sources
= pmc
->sources
;
2114 pmc
->sources
= NULL
;
2115 pmc
->sfmode
= MCAST_EXCLUDE
;
2116 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
2117 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
2118 spin_unlock_bh(&pmc
->lock
);
2120 for (psf
= tomb
; psf
; psf
= nextpsf
) {
2121 nextpsf
= psf
->sf_next
;
2124 for (psf
= sources
; psf
; psf
= nextpsf
) {
2125 nextpsf
= psf
->sf_next
;
2130 /* Join a multicast group
2133 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2135 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
2136 struct ip_mc_socklist
*iml
, *i
;
2137 struct in_device
*in_dev
;
2138 struct inet_sock
*inet
= inet_sk(sk
);
2139 struct net
*net
= sock_net(sk
);
2146 if (!ipv4_is_multicast(addr
))
2149 in_dev
= ip_mc_find_dev(net
, imr
);
2157 ifindex
= imr
->imr_ifindex
;
2158 for_each_pmc_rtnl(inet
, i
) {
2159 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
2160 i
->multi
.imr_ifindex
== ifindex
)
2165 if (count
>= net
->ipv4
.sysctl_igmp_max_memberships
)
2167 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
2171 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
2172 iml
->next_rcu
= inet
->mc_list
;
2174 iml
->sfmode
= MCAST_EXCLUDE
;
2175 rcu_assign_pointer(inet
->mc_list
, iml
);
2176 ip_mc_inc_group(in_dev
, addr
);
2181 EXPORT_SYMBOL(ip_mc_join_group
);
2183 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
2184 struct in_device
*in_dev
)
2186 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
2190 /* any-source empty exclude case */
2191 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2192 iml
->sfmode
, 0, NULL
, 0);
2194 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2195 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
2196 RCU_INIT_POINTER(iml
->sflist
, NULL
);
2197 /* decrease mem now to avoid the memleak warning */
2198 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
2199 kfree_rcu(psf
, rcu
);
2203 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2205 struct inet_sock
*inet
= inet_sk(sk
);
2206 struct ip_mc_socklist
*iml
;
2207 struct ip_mc_socklist __rcu
**imlp
;
2208 struct in_device
*in_dev
;
2209 struct net
*net
= sock_net(sk
);
2210 __be32 group
= imr
->imr_multiaddr
.s_addr
;
2212 int ret
= -EADDRNOTAVAIL
;
2216 in_dev
= ip_mc_find_dev(net
, imr
);
2217 if (!imr
->imr_ifindex
&& !imr
->imr_address
.s_addr
&& !in_dev
) {
2221 ifindex
= imr
->imr_ifindex
;
2222 for (imlp
= &inet
->mc_list
;
2223 (iml
= rtnl_dereference(*imlp
)) != NULL
;
2224 imlp
= &iml
->next_rcu
) {
2225 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
2228 if (iml
->multi
.imr_ifindex
!= ifindex
)
2230 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
2231 iml
->multi
.imr_address
.s_addr
)
2234 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2236 *imlp
= iml
->next_rcu
;
2239 ip_mc_dec_group(in_dev
, group
);
2241 /* decrease mem now to avoid the memleak warning */
2242 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2243 kfree_rcu(iml
, rcu
);
2249 EXPORT_SYMBOL(ip_mc_leave_group
);
2251 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
2252 ip_mreq_source
*mreqs
, int ifindex
)
2255 struct ip_mreqn imr
;
2256 __be32 addr
= mreqs
->imr_multiaddr
;
2257 struct ip_mc_socklist
*pmc
;
2258 struct in_device
*in_dev
= NULL
;
2259 struct inet_sock
*inet
= inet_sk(sk
);
2260 struct ip_sf_socklist
*psl
;
2261 struct net
*net
= sock_net(sk
);
2265 if (!ipv4_is_multicast(addr
))
2270 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
2271 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
2272 imr
.imr_ifindex
= ifindex
;
2273 in_dev
= ip_mc_find_dev(net
, &imr
);
2279 err
= -EADDRNOTAVAIL
;
2281 for_each_pmc_rtnl(inet
, pmc
) {
2282 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
2283 imr
.imr_multiaddr
.s_addr
) &&
2284 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
2287 if (!pmc
) { /* must have a prior join */
2291 /* if a source filter was set, must be the same mode as before */
2293 if (pmc
->sfmode
!= omode
) {
2297 } else if (pmc
->sfmode
!= omode
) {
2298 /* allow mode switches for empty-set filters */
2299 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
2300 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
2302 pmc
->sfmode
= omode
;
2305 psl
= rtnl_dereference(pmc
->sflist
);
2308 goto done
; /* err = -EADDRNOTAVAIL */
2310 for (i
= 0; i
< psl
->sl_count
; i
++) {
2311 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2316 if (rv
) /* source not found */
2317 goto done
; /* err = -EADDRNOTAVAIL */
2319 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2320 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
2325 /* update the interface filter */
2326 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2327 &mreqs
->imr_sourceaddr
, 1);
2329 for (j
= i
+1; j
< psl
->sl_count
; j
++)
2330 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
2335 /* else, add a new source to the filter */
2337 if (psl
&& psl
->sl_count
>= net
->ipv4
.sysctl_igmp_max_msf
) {
2341 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2342 struct ip_sf_socklist
*newpsl
;
2343 int count
= IP_SFBLOCK
;
2346 count
+= psl
->sl_max
;
2347 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2352 newpsl
->sl_max
= count
;
2353 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2355 for (i
= 0; i
< psl
->sl_count
; i
++)
2356 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2357 /* decrease mem now to avoid the memleak warning */
2358 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2359 kfree_rcu(psl
, rcu
);
2361 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2364 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2365 for (i
= 0; i
< psl
->sl_count
; i
++) {
2366 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2371 if (rv
== 0) /* address already there is an error */
2373 for (j
= psl
->sl_count
-1; j
>= i
; j
--)
2374 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2375 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2378 /* update the interface list */
2379 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2380 &mreqs
->imr_sourceaddr
, 1);
2383 err
= ip_mc_leave_group(sk
, &imr
);
2387 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2390 struct ip_mreqn imr
;
2391 __be32 addr
= msf
->imsf_multiaddr
;
2392 struct ip_mc_socklist
*pmc
;
2393 struct in_device
*in_dev
;
2394 struct inet_sock
*inet
= inet_sk(sk
);
2395 struct ip_sf_socklist
*newpsl
, *psl
;
2396 struct net
*net
= sock_net(sk
);
2399 if (!ipv4_is_multicast(addr
))
2401 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2402 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2407 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2408 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2409 imr
.imr_ifindex
= ifindex
;
2410 in_dev
= ip_mc_find_dev(net
, &imr
);
2417 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2418 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2423 for_each_pmc_rtnl(inet
, pmc
) {
2424 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2425 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2428 if (!pmc
) { /* must have a prior join */
2432 if (msf
->imsf_numsrc
) {
2433 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2439 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2440 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2441 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2442 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2443 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2445 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2450 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2451 msf
->imsf_fmode
, 0, NULL
, 0);
2453 psl
= rtnl_dereference(pmc
->sflist
);
2455 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2456 psl
->sl_count
, psl
->sl_addr
, 0);
2457 /* decrease mem now to avoid the memleak warning */
2458 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2459 kfree_rcu(psl
, rcu
);
2461 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2463 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2464 pmc
->sfmode
= msf
->imsf_fmode
;
2468 err
= ip_mc_leave_group(sk
, &imr
);
2472 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2473 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2475 int err
, len
, count
, copycount
;
2476 struct ip_mreqn imr
;
2477 __be32 addr
= msf
->imsf_multiaddr
;
2478 struct ip_mc_socklist
*pmc
;
2479 struct in_device
*in_dev
;
2480 struct inet_sock
*inet
= inet_sk(sk
);
2481 struct ip_sf_socklist
*psl
;
2482 struct net
*net
= sock_net(sk
);
2486 if (!ipv4_is_multicast(addr
))
2489 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2490 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2491 imr
.imr_ifindex
= 0;
2492 in_dev
= ip_mc_find_dev(net
, &imr
);
2498 err
= -EADDRNOTAVAIL
;
2500 for_each_pmc_rtnl(inet
, pmc
) {
2501 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2502 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2505 if (!pmc
) /* must have a prior join */
2507 msf
->imsf_fmode
= pmc
->sfmode
;
2508 psl
= rtnl_dereference(pmc
->sflist
);
2513 count
= psl
->sl_count
;
2515 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2516 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2517 msf
->imsf_numsrc
= count
;
2518 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2519 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2523 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2530 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2531 struct group_filter __user
*optval
, int __user
*optlen
)
2533 int err
, i
, count
, copycount
;
2534 struct sockaddr_in
*psin
;
2536 struct ip_mc_socklist
*pmc
;
2537 struct inet_sock
*inet
= inet_sk(sk
);
2538 struct ip_sf_socklist
*psl
;
2542 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2543 if (psin
->sin_family
!= AF_INET
)
2545 addr
= psin
->sin_addr
.s_addr
;
2546 if (!ipv4_is_multicast(addr
))
2549 err
= -EADDRNOTAVAIL
;
2551 for_each_pmc_rtnl(inet
, pmc
) {
2552 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2553 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2556 if (!pmc
) /* must have a prior join */
2558 gsf
->gf_fmode
= pmc
->sfmode
;
2559 psl
= rtnl_dereference(pmc
->sflist
);
2560 count
= psl
? psl
->sl_count
: 0;
2561 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2562 gsf
->gf_numsrc
= count
;
2563 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2564 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2567 for (i
= 0; i
< copycount
; i
++) {
2568 struct sockaddr_storage ss
;
2570 psin
= (struct sockaddr_in
*)&ss
;
2571 memset(&ss
, 0, sizeof(ss
));
2572 psin
->sin_family
= AF_INET
;
2573 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2574 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2583 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2585 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
,
2588 struct inet_sock
*inet
= inet_sk(sk
);
2589 struct ip_mc_socklist
*pmc
;
2590 struct ip_sf_socklist
*psl
;
2595 if (!ipv4_is_multicast(loc_addr
))
2599 for_each_pmc_rcu(inet
, pmc
) {
2600 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2601 (pmc
->multi
.imr_ifindex
== dif
||
2602 (sdif
&& pmc
->multi
.imr_ifindex
== sdif
)))
2608 psl
= rcu_dereference(pmc
->sflist
);
2609 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2613 for (i
= 0; i
< psl
->sl_count
; i
++) {
2614 if (psl
->sl_addr
[i
] == rmt_addr
)
2618 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2620 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2630 * A socket is closing.
2633 void ip_mc_drop_socket(struct sock
*sk
)
2635 struct inet_sock
*inet
= inet_sk(sk
);
2636 struct ip_mc_socklist
*iml
;
2637 struct net
*net
= sock_net(sk
);
2643 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2644 struct in_device
*in_dev
;
2646 inet
->mc_list
= iml
->next_rcu
;
2647 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2648 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2650 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2651 /* decrease mem now to avoid the memleak warning */
2652 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2653 kfree_rcu(iml
, rcu
);
2658 /* called with rcu_read_lock() */
2659 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u8 proto
)
2661 struct ip_mc_list
*im
;
2662 struct ip_mc_list __rcu
**mc_hash
;
2663 struct ip_sf_list
*psf
;
2666 mc_hash
= rcu_dereference(in_dev
->mc_hash
);
2668 u32 hash
= hash_32((__force u32
)mc_addr
, MC_HASH_SZ_LOG
);
2670 for (im
= rcu_dereference(mc_hash
[hash
]);
2672 im
= rcu_dereference(im
->next_hash
)) {
2673 if (im
->multiaddr
== mc_addr
)
2677 for_each_pmc_rcu(in_dev
, im
) {
2678 if (im
->multiaddr
== mc_addr
)
2682 if (im
&& proto
== IPPROTO_IGMP
) {
2686 for (psf
= im
->sources
; psf
; psf
= psf
->sf_next
) {
2687 if (psf
->sf_inaddr
== src_addr
)
2691 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2692 psf
->sf_count
[MCAST_EXCLUDE
] !=
2693 im
->sfcount
[MCAST_EXCLUDE
];
2695 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2697 rv
= 1; /* unspecified source; tentatively allow */
2702 #if defined(CONFIG_PROC_FS)
2703 struct igmp_mc_iter_state
{
2704 struct seq_net_private p
;
2705 struct net_device
*dev
;
2706 struct in_device
*in_dev
;
2709 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2711 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2713 struct net
*net
= seq_file_net(seq
);
2714 struct ip_mc_list
*im
= NULL
;
2715 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2717 state
->in_dev
= NULL
;
2718 for_each_netdev_rcu(net
, state
->dev
) {
2719 struct in_device
*in_dev
;
2721 in_dev
= __in_dev_get_rcu(state
->dev
);
2724 im
= rcu_dereference(in_dev
->mc_list
);
2726 state
->in_dev
= in_dev
;
2733 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2735 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2737 im
= rcu_dereference(im
->next_rcu
);
2739 state
->dev
= next_net_device_rcu(state
->dev
);
2741 state
->in_dev
= NULL
;
2744 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2747 im
= rcu_dereference(state
->in_dev
->mc_list
);
2752 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2754 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2756 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2758 return pos
? NULL
: im
;
2761 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2765 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2768 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2770 struct ip_mc_list
*im
;
2771 if (v
== SEQ_START_TOKEN
)
2772 im
= igmp_mc_get_first(seq
);
2774 im
= igmp_mc_get_next(seq
, v
);
2779 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2782 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2784 state
->in_dev
= NULL
;
2789 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2791 if (v
== SEQ_START_TOKEN
)
2793 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2795 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2796 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2800 #ifdef CONFIG_IP_MULTICAST
2801 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2802 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2808 if (rcu_access_pointer(state
->in_dev
->mc_list
) == im
) {
2809 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2810 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2813 delta
= im
->timer
.expires
- jiffies
;
2815 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2816 im
->multiaddr
, im
->users
,
2818 im
->tm_running
? jiffies_delta_to_clock_t(delta
) : 0,
2824 static const struct seq_operations igmp_mc_seq_ops
= {
2825 .start
= igmp_mc_seq_start
,
2826 .next
= igmp_mc_seq_next
,
2827 .stop
= igmp_mc_seq_stop
,
2828 .show
= igmp_mc_seq_show
,
2831 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2833 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2834 sizeof(struct igmp_mc_iter_state
));
2837 static const struct file_operations igmp_mc_seq_fops
= {
2838 .owner
= THIS_MODULE
,
2839 .open
= igmp_mc_seq_open
,
2841 .llseek
= seq_lseek
,
2842 .release
= seq_release_net
,
2845 struct igmp_mcf_iter_state
{
2846 struct seq_net_private p
;
2847 struct net_device
*dev
;
2848 struct in_device
*idev
;
2849 struct ip_mc_list
*im
;
2852 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2854 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2856 struct net
*net
= seq_file_net(seq
);
2857 struct ip_sf_list
*psf
= NULL
;
2858 struct ip_mc_list
*im
= NULL
;
2859 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2863 for_each_netdev_rcu(net
, state
->dev
) {
2864 struct in_device
*idev
;
2865 idev
= __in_dev_get_rcu(state
->dev
);
2866 if (unlikely(!idev
))
2868 im
= rcu_dereference(idev
->mc_list
);
2870 spin_lock_bh(&im
->lock
);
2877 spin_unlock_bh(&im
->lock
);
2883 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2885 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2889 spin_unlock_bh(&state
->im
->lock
);
2890 state
->im
= state
->im
->next
;
2891 while (!state
->im
) {
2892 state
->dev
= next_net_device_rcu(state
->dev
);
2897 state
->idev
= __in_dev_get_rcu(state
->dev
);
2900 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2904 spin_lock_bh(&state
->im
->lock
);
2905 psf
= state
->im
->sources
;
2911 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2913 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2915 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2917 return pos
? NULL
: psf
;
2920 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2924 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2927 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2929 struct ip_sf_list
*psf
;
2930 if (v
== SEQ_START_TOKEN
)
2931 psf
= igmp_mcf_get_first(seq
);
2933 psf
= igmp_mcf_get_next(seq
, v
);
2938 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2941 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2942 if (likely(state
->im
)) {
2943 spin_unlock_bh(&state
->im
->lock
);
2951 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2953 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2954 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2956 if (v
== SEQ_START_TOKEN
) {
2957 seq_puts(seq
, "Idx Device MCA SRC INC EXC\n");
2961 "0x%08x %6lu %6lu\n",
2962 state
->dev
->ifindex
, state
->dev
->name
,
2963 ntohl(state
->im
->multiaddr
),
2964 ntohl(psf
->sf_inaddr
),
2965 psf
->sf_count
[MCAST_INCLUDE
],
2966 psf
->sf_count
[MCAST_EXCLUDE
]);
2971 static const struct seq_operations igmp_mcf_seq_ops
= {
2972 .start
= igmp_mcf_seq_start
,
2973 .next
= igmp_mcf_seq_next
,
2974 .stop
= igmp_mcf_seq_stop
,
2975 .show
= igmp_mcf_seq_show
,
2978 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2980 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2981 sizeof(struct igmp_mcf_iter_state
));
2984 static const struct file_operations igmp_mcf_seq_fops
= {
2985 .owner
= THIS_MODULE
,
2986 .open
= igmp_mcf_seq_open
,
2988 .llseek
= seq_lseek
,
2989 .release
= seq_release_net
,
2992 static int __net_init
igmp_net_init(struct net
*net
)
2994 struct proc_dir_entry
*pde
;
2997 pde
= proc_create("igmp", S_IRUGO
, net
->proc_net
, &igmp_mc_seq_fops
);
3000 pde
= proc_create("mcfilter", S_IRUGO
, net
->proc_net
,
3001 &igmp_mcf_seq_fops
);
3004 err
= inet_ctl_sock_create(&net
->ipv4
.mc_autojoin_sk
, AF_INET
,
3005 SOCK_DGRAM
, 0, net
);
3007 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3015 remove_proc_entry("mcfilter", net
->proc_net
);
3017 remove_proc_entry("igmp", net
->proc_net
);
3022 static void __net_exit
igmp_net_exit(struct net
*net
)
3024 remove_proc_entry("mcfilter", net
->proc_net
);
3025 remove_proc_entry("igmp", net
->proc_net
);
3026 inet_ctl_sock_destroy(net
->ipv4
.mc_autojoin_sk
);
3029 static struct pernet_operations igmp_net_ops
= {
3030 .init
= igmp_net_init
,
3031 .exit
= igmp_net_exit
,
3035 static int igmp_netdev_event(struct notifier_block
*this,
3036 unsigned long event
, void *ptr
)
3038 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3039 struct in_device
*in_dev
;
3042 case NETDEV_RESEND_IGMP
:
3043 in_dev
= __in_dev_get_rtnl(dev
);
3045 ip_mc_rejoin_groups(in_dev
);
3053 static struct notifier_block igmp_notifier
= {
3054 .notifier_call
= igmp_netdev_event
,
3057 int __init
igmp_mc_init(void)
3059 #if defined(CONFIG_PROC_FS)
3062 err
= register_pernet_subsys(&igmp_net_ops
);
3065 err
= register_netdevice_notifier(&igmp_notifier
);
3067 goto reg_notif_fail
;
3071 unregister_pernet_subsys(&igmp_net_ops
);
3074 return register_netdevice_notifier(&igmp_notifier
);