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1/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * Authors:
113aa838 5 * Alan Cox <alan@lxorguk.ukuu.org.uk>
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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 */
15
16#ifndef _LINUX_IGMP_H
17#define _LINUX_IGMP_H
18
de8b0bca 19#include <linux/types.h>
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20#include <asm/byteorder.h>
21
22/*
23 * IGMP protocol structures
24 */
25
26/*
27 * Header in on cable format
28 */
29
d94d9fee 30struct igmphdr {
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31 __u8 type;
32 __u8 code; /* For newer IGMP */
9981a0e3 33 __sum16 csum;
942bf921 34 __be32 group;
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35};
36
37/* V3 group record types [grec_type] */
38#define IGMPV3_MODE_IS_INCLUDE 1
39#define IGMPV3_MODE_IS_EXCLUDE 2
40#define IGMPV3_CHANGE_TO_INCLUDE 3
41#define IGMPV3_CHANGE_TO_EXCLUDE 4
42#define IGMPV3_ALLOW_NEW_SOURCES 5
43#define IGMPV3_BLOCK_OLD_SOURCES 6
44
45struct igmpv3_grec {
46 __u8 grec_type;
47 __u8 grec_auxwords;
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48 __be16 grec_nsrcs;
49 __be32 grec_mca;
50 __be32 grec_src[0];
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51};
52
53struct igmpv3_report {
54 __u8 type;
55 __u8 resv1;
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56 __be16 csum;
57 __be16 resv2;
58 __be16 ngrec;
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59 struct igmpv3_grec grec[0];
60};
61
62struct igmpv3_query {
63 __u8 type;
64 __u8 code;
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65 __be16 csum;
66 __be32 group;
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67#if defined(__LITTLE_ENDIAN_BITFIELD)
68 __u8 qrv:3,
69 suppress:1,
70 resv:4;
71#elif defined(__BIG_ENDIAN_BITFIELD)
72 __u8 resv:4,
73 suppress:1,
74 qrv:3;
75#else
76#error "Please fix <asm/byteorder.h>"
77#endif
78 __u8 qqic;
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79 __be16 nsrcs;
80 __be32 srcs[0];
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81};
82
83#define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */
84#define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */
85#define IGMP_DVMRP 0x13 /* DVMRP routing */
86#define IGMP_PIM 0x14 /* PIM routing */
87#define IGMP_TRACE 0x15
88#define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */
89#define IGMP_HOST_LEAVE_MESSAGE 0x17
90#define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */
91
92#define IGMP_MTRACE_RESP 0x1e
93#define IGMP_MTRACE 0x1f
94
95
96/*
97 * Use the BSD names for these for compatibility
98 */
99
100#define IGMP_DELAYING_MEMBER 0x01
101#define IGMP_IDLE_MEMBER 0x02
102#define IGMP_LAZY_MEMBER 0x03
103#define IGMP_SLEEPING_MEMBER 0x04
104#define IGMP_AWAKENING_MEMBER 0x05
105
106#define IGMP_MINLEN 8
107
108#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
109 /* query (in seconds) */
110
111#define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */
112 /* specifies time in 10th of seconds */
113
114#define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */
115 /* message in this period of time, */
116 /* revert to IGMP v2 router. */
117
118#define IGMP_ALL_HOSTS htonl(0xE0000001L)
119#define IGMP_ALL_ROUTER htonl(0xE0000002L)
120#define IGMPV3_ALL_MCR htonl(0xE0000016L)
121#define IGMP_LOCAL_GROUP htonl(0xE0000000L)
122#define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L)
123
124/*
125 * struct for keeping the multicast list in
126 */
127
128#ifdef __KERNEL__
129#include <linux/skbuff.h>
d7fe0f24 130#include <linux/timer.h>
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131#include <linux/in.h>
132
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133static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
134{
135 return (struct igmphdr *)skb_transport_header(skb);
136}
137
138static inline struct igmpv3_report *
139 igmpv3_report_hdr(const struct sk_buff *skb)
140{
141 return (struct igmpv3_report *)skb_transport_header(skb);
142}
143
144static inline struct igmpv3_query *
145 igmpv3_query_hdr(const struct sk_buff *skb)
146{
147 return (struct igmpv3_query *)skb_transport_header(skb);
148}
149
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ACM
150extern int sysctl_igmp_max_memberships;
151extern int sysctl_igmp_max_msf;
152
d94d9fee 153struct ip_sf_socklist {
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154 unsigned int sl_max;
155 unsigned int sl_count;
c85bb41e 156 struct rcu_head rcu;
ea4d9e72 157 __be32 sl_addr[0];
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158};
159
160#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
63007727 161 (count) * sizeof(__be32))
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162
163#define IP_SFBLOCK 10 /* allocate this many at once */
164
165/* ip_mc_socklist is real list now. Speed is not argument;
166 this list never used in fast path code
167 */
168
d94d9fee 169struct ip_mc_socklist {
1da177e4 170 struct ip_mc_socklist *next;
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171 struct ip_mreqn multi;
172 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
173 struct ip_sf_socklist *sflist;
c85bb41e 174 struct rcu_head rcu;
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175};
176
d94d9fee 177struct ip_sf_list {
1da177e4 178 struct ip_sf_list *sf_next;
ea4d9e72 179 __be32 sf_inaddr;
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180 unsigned long sf_count[2]; /* include/exclude counts */
181 unsigned char sf_gsresp; /* include in g & s response? */
182 unsigned char sf_oldin; /* change state */
183 unsigned char sf_crcount; /* retrans. left to send */
184};
185
d94d9fee 186struct ip_mc_list {
1da177e4 187 struct in_device *interface;
338fcf98 188 __be32 multiaddr;
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189 struct ip_sf_list *sources;
190 struct ip_sf_list *tomb;
191 unsigned int sfmode;
192 unsigned long sfcount[2];
193 struct ip_mc_list *next;
194 struct timer_list timer;
195 int users;
196 atomic_t refcnt;
197 spinlock_t lock;
198 char tm_running;
199 char reporter;
200 char unsolicit_count;
201 char loaded;
202 unsigned char gsquery; /* check source marks? */
203 unsigned char crcount;
204};
205
206/* V3 exponential field decoding */
207#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
208#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
209 ((value) < (thresh) ? (value) : \
fb47ddb2 210 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
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211 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
212
213#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
214#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
215
a60c4923 216extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
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217extern int igmp_rcv(struct sk_buff *);
218extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
219extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
220extern void ip_mc_drop_socket(struct sock *sk);
221extern int ip_mc_source(int add, int omode, struct sock *sk,
222 struct ip_mreq_source *mreqs, int ifindex);
223extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
224extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
225 struct ip_msfilter __user *optval, int __user *optlen);
226extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
227 struct group_filter __user *optval, int __user *optlen);
c0cda068 228extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
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229extern void ip_mc_init_dev(struct in_device *);
230extern void ip_mc_destroy_dev(struct in_device *);
231extern void ip_mc_up(struct in_device *);
232extern void ip_mc_down(struct in_device *);
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233extern void ip_mc_unmap(struct in_device *);
234extern void ip_mc_remap(struct in_device *);
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235extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
236extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
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237extern void ip_mc_rejoin_group(struct ip_mc_list *im);
238
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239#endif
240#endif