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1da177e4 LT |
1 | /* |
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 | ||
29 | struct igmphdr | |
30 | { | |
31 | __u8 type; | |
32 | __u8 code; /* For newer IGMP */ | |
33 | __u16 csum; | |
34 | __u32 group; | |
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 | ||
45 | struct igmpv3_grec { | |
46 | __u8 grec_type; | |
47 | __u8 grec_auxwords; | |
48 | __u16 grec_nsrcs; | |
49 | __u32 grec_mca; | |
50 | __u32 grec_src[0]; | |
51 | }; | |
52 | ||
53 | struct igmpv3_report { | |
54 | __u8 type; | |
55 | __u8 resv1; | |
56 | __u16 csum; | |
57 | __u16 resv2; | |
58 | __u16 ngrec; | |
59 | struct igmpv3_grec grec[0]; | |
60 | }; | |
61 | ||
62 | struct igmpv3_query { | |
63 | __u8 type; | |
64 | __u8 code; | |
65 | __u16 csum; | |
66 | __u32 group; | |
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; | |
79 | __u16 nsrcs; | |
80 | __u32 srcs[0]; | |
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> | |
130 | #include <linux/in.h> | |
131 | ||
20380731 ACM |
132 | extern int sysctl_igmp_max_memberships; |
133 | extern int sysctl_igmp_max_msf; | |
134 | ||
1da177e4 LT |
135 | struct ip_sf_socklist |
136 | { | |
137 | unsigned int sl_max; | |
138 | unsigned int sl_count; | |
139 | __u32 sl_addr[0]; | |
140 | }; | |
141 | ||
142 | #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ | |
143 | (count) * sizeof(__u32)) | |
144 | ||
145 | #define IP_SFBLOCK 10 /* allocate this many at once */ | |
146 | ||
147 | /* ip_mc_socklist is real list now. Speed is not argument; | |
148 | this list never used in fast path code | |
149 | */ | |
150 | ||
151 | struct ip_mc_socklist | |
152 | { | |
153 | struct ip_mc_socklist *next; | |
1da177e4 LT |
154 | struct ip_mreqn multi; |
155 | unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ | |
156 | struct ip_sf_socklist *sflist; | |
157 | }; | |
158 | ||
159 | struct ip_sf_list | |
160 | { | |
161 | struct ip_sf_list *sf_next; | |
162 | __u32 sf_inaddr; | |
163 | unsigned long sf_count[2]; /* include/exclude counts */ | |
164 | unsigned char sf_gsresp; /* include in g & s response? */ | |
165 | unsigned char sf_oldin; /* change state */ | |
166 | unsigned char sf_crcount; /* retrans. left to send */ | |
167 | }; | |
168 | ||
169 | struct ip_mc_list | |
170 | { | |
171 | struct in_device *interface; | |
172 | unsigned long multiaddr; | |
173 | struct ip_sf_list *sources; | |
174 | struct ip_sf_list *tomb; | |
175 | unsigned int sfmode; | |
176 | unsigned long sfcount[2]; | |
177 | struct ip_mc_list *next; | |
178 | struct timer_list timer; | |
179 | int users; | |
180 | atomic_t refcnt; | |
181 | spinlock_t lock; | |
182 | char tm_running; | |
183 | char reporter; | |
184 | char unsolicit_count; | |
185 | char loaded; | |
186 | unsigned char gsquery; /* check source marks? */ | |
187 | unsigned char crcount; | |
188 | }; | |
189 | ||
190 | /* V3 exponential field decoding */ | |
191 | #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) | |
192 | #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ | |
193 | ((value) < (thresh) ? (value) : \ | |
194 | ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \ | |
195 | (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) | |
196 | ||
197 | #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) | |
198 | #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) | |
199 | ||
200 | extern int ip_check_mc(struct in_device *dev, u32 mc_addr, u32 src_addr, u16 proto); | |
201 | extern int igmp_rcv(struct sk_buff *); | |
202 | extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); | |
203 | extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); | |
204 | extern void ip_mc_drop_socket(struct sock *sk); | |
205 | extern int ip_mc_source(int add, int omode, struct sock *sk, | |
206 | struct ip_mreq_source *mreqs, int ifindex); | |
207 | extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); | |
208 | extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
209 | struct ip_msfilter __user *optval, int __user *optlen); | |
210 | extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
211 | struct group_filter __user *optval, int __user *optlen); | |
212 | extern int ip_mc_sf_allow(struct sock *sk, u32 local, u32 rmt, int dif); | |
213 | extern void ip_mr_init(void); | |
214 | extern void ip_mc_init_dev(struct in_device *); | |
215 | extern void ip_mc_destroy_dev(struct in_device *); | |
216 | extern void ip_mc_up(struct in_device *); | |
217 | extern void ip_mc_down(struct in_device *); | |
218 | extern void ip_mc_dec_group(struct in_device *in_dev, u32 addr); | |
219 | extern void ip_mc_inc_group(struct in_device *in_dev, u32 addr); | |
220 | #endif | |
221 | #endif |