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1da177e4
LT
1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * Authors:
113aa838 5 * Alan Cox <alan@lxorguk.ukuu.org.uk>
1da177e4
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6 *
7 * Extended to talk the BSD extended IGMP protocol of mrouted 3.6
8 *
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
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LT
15#ifndef _LINUX_IGMP_H
16#define _LINUX_IGMP_H
17
1da177e4 18#include <linux/skbuff.h>
d7fe0f24 19#include <linux/timer.h>
1da177e4 20#include <linux/in.h>
607ca46e 21#include <uapi/linux/igmp.h>
1da177e4 22
cc32e054
JP
23static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
24{
25 return (struct igmphdr *)skb_transport_header(skb);
26}
27
28static inline struct igmpv3_report *
29 igmpv3_report_hdr(const struct sk_buff *skb)
30{
31 return (struct igmpv3_report *)skb_transport_header(skb);
32}
33
34static inline struct igmpv3_query *
35 igmpv3_query_hdr(const struct sk_buff *skb)
36{
37 return (struct igmpv3_query *)skb_transport_header(skb);
38}
39
20380731
ACM
40extern int sysctl_igmp_max_memberships;
41extern int sysctl_igmp_max_msf;
a9fe8e29 42extern int sysctl_igmp_qrv;
20380731 43
d94d9fee 44struct ip_sf_socklist {
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45 unsigned int sl_max;
46 unsigned int sl_count;
c85bb41e 47 struct rcu_head rcu;
ea4d9e72 48 __be32 sl_addr[0];
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49};
50
51#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
63007727 52 (count) * sizeof(__be32))
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53
54#define IP_SFBLOCK 10 /* allocate this many at once */
55
56/* ip_mc_socklist is real list now. Speed is not argument;
57 this list never used in fast path code
58 */
59
d94d9fee 60struct ip_mc_socklist {
1d7138de 61 struct ip_mc_socklist __rcu *next_rcu;
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62 struct ip_mreqn multi;
63 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
1d7138de 64 struct ip_sf_socklist __rcu *sflist;
c85bb41e 65 struct rcu_head rcu;
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66};
67
d94d9fee 68struct ip_sf_list {
1da177e4 69 struct ip_sf_list *sf_next;
ea4d9e72 70 __be32 sf_inaddr;
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71 unsigned long sf_count[2]; /* include/exclude counts */
72 unsigned char sf_gsresp; /* include in g & s response? */
73 unsigned char sf_oldin; /* change state */
74 unsigned char sf_crcount; /* retrans. left to send */
75};
76
d94d9fee 77struct ip_mc_list {
1da177e4 78 struct in_device *interface;
338fcf98 79 __be32 multiaddr;
1d7138de 80 unsigned int sfmode;
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LT
81 struct ip_sf_list *sources;
82 struct ip_sf_list *tomb;
1da177e4 83 unsigned long sfcount[2];
1d7138de
ED
84 union {
85 struct ip_mc_list *next;
86 struct ip_mc_list __rcu *next_rcu;
87 };
e9897071 88 struct ip_mc_list __rcu *next_hash;
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89 struct timer_list timer;
90 int users;
91 atomic_t refcnt;
92 spinlock_t lock;
93 char tm_running;
94 char reporter;
95 char unsolicit_count;
96 char loaded;
97 unsigned char gsquery; /* check source marks? */
98 unsigned char crcount;
1d7138de 99 struct rcu_head rcu;
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100};
101
102/* V3 exponential field decoding */
103#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
104#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
105 ((value) < (thresh) ? (value) : \
fb47ddb2 106 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
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107 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
108
109#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
110#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
111
dbdd9a52 112extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
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113extern int igmp_rcv(struct sk_buff *);
114extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
115extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
116extern void ip_mc_drop_socket(struct sock *sk);
117extern int ip_mc_source(int add, int omode, struct sock *sk,
118 struct ip_mreq_source *mreqs, int ifindex);
119extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
120extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
121 struct ip_msfilter __user *optval, int __user *optlen);
122extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
123 struct group_filter __user *optval, int __user *optlen);
c0cda068 124extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
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125extern void ip_mc_init_dev(struct in_device *);
126extern void ip_mc_destroy_dev(struct in_device *);
127extern void ip_mc_up(struct in_device *);
128extern void ip_mc_down(struct in_device *);
75c78500
MS
129extern void ip_mc_unmap(struct in_device *);
130extern void ip_mc_remap(struct in_device *);
8f935bbd
AV
131extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
132extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
a816c7c7 133
1da177e4 134#endif