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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * Authors:
5 * Alan Cox <Alan.Cox@linux.org>
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
19#include <asm/byteorder.h>
20
21/*
22 * IGMP protocol structures
23 */
24
25/*
26 * Header in on cable format
27 */
28
29struct igmphdr
30{
31 __u8 type;
32 __u8 code; /* For newer IGMP */
Al Viro9981a0e2006-11-14 21:24:30 -080033 __sum16 csum;
Al Viro942bf922006-09-27 18:30:28 -070034 __be32 group;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035};
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;
Al Viro942bf922006-09-27 18:30:28 -070048 __be16 grec_nsrcs;
49 __be32 grec_mca;
50 __be32 grec_src[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -070051};
52
53struct igmpv3_report {
54 __u8 type;
55 __u8 resv1;
Al Viro942bf922006-09-27 18:30:28 -070056 __be16 csum;
57 __be16 resv2;
58 __be16 ngrec;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 struct igmpv3_grec grec[0];
60};
61
62struct igmpv3_query {
63 __u8 type;
64 __u8 code;
Al Viro942bf922006-09-27 18:30:28 -070065 __be16 csum;
66 __be32 group;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#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;
Al Viro942bf922006-09-27 18:30:28 -070079 __be16 nsrcs;
80 __be32 srcs[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -070081};
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>
Al Virod7fe0f22006-12-03 23:15:30 -0500130#include <linux/timer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#include <linux/in.h>
132
Joe Perchescc32e052008-03-23 22:05:44 -0700133static 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
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300150extern int sysctl_igmp_max_memberships;
151extern int sysctl_igmp_max_msf;
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153struct ip_sf_socklist
154{
155 unsigned int sl_max;
156 unsigned int sl_count;
Al Viroea4d9e72006-09-27 18:30:52 -0700157 __be32 sl_addr[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158};
159
160#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
Al Viro63007722006-09-27 18:31:32 -0700161 (count) * sizeof(__be32))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
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
169struct ip_mc_socklist
170{
171 struct ip_mc_socklist *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 struct ip_mreqn multi;
173 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
174 struct ip_sf_socklist *sflist;
175};
176
177struct ip_sf_list
178{
179 struct ip_sf_list *sf_next;
Al Viroea4d9e72006-09-27 18:30:52 -0700180 __be32 sf_inaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 unsigned long sf_count[2]; /* include/exclude counts */
182 unsigned char sf_gsresp; /* include in g & s response? */
183 unsigned char sf_oldin; /* change state */
184 unsigned char sf_crcount; /* retrans. left to send */
185};
186
187struct ip_mc_list
188{
189 struct in_device *interface;
Alexey Dobriyan338fcf92006-06-05 21:04:39 -0700190 __be32 multiaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 struct ip_sf_list *sources;
192 struct ip_sf_list *tomb;
193 unsigned int sfmode;
194 unsigned long sfcount[2];
195 struct ip_mc_list *next;
196 struct timer_list timer;
197 int users;
198 atomic_t refcnt;
199 spinlock_t lock;
200 char tm_running;
201 char reporter;
202 char unsolicit_count;
203 char loaded;
204 unsigned char gsquery; /* check source marks? */
205 unsigned char crcount;
206};
207
208/* V3 exponential field decoding */
209#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
210#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
211 ((value) < (thresh) ? (value) : \
David L Stevensfb47ddb2006-11-19 10:38:39 -0800212 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
214
215#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
216#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
217
Al Viroa60c4922006-09-26 21:28:34 -0700218extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219extern int igmp_rcv(struct sk_buff *);
220extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
221extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
222extern void ip_mc_drop_socket(struct sock *sk);
223extern int ip_mc_source(int add, int omode, struct sock *sk,
224 struct ip_mreq_source *mreqs, int ifindex);
225extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
226extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
227 struct ip_msfilter __user *optval, int __user *optlen);
228extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
229 struct group_filter __user *optval, int __user *optlen);
Al Viroc0cda062006-09-27 18:31:10 -0700230extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231extern void ip_mr_init(void);
232extern void ip_mc_init_dev(struct in_device *);
233extern void ip_mc_destroy_dev(struct in_device *);
234extern void ip_mc_up(struct in_device *);
235extern void ip_mc_down(struct in_device *);
Al Viro8f935bb2006-09-27 18:30:07 -0700236extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
237extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
Jay Vosburgha816c7c2007-02-28 17:03:37 -0800238extern void ip_mc_rejoin_group(struct ip_mc_list *im);
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240#endif
241#endif