igmp.h revision 8f935bbd7c6c66796c2403aefdab74bb48045bf6
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 29struct 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 45struct 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 53struct 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 62struct 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 132extern int sysctl_igmp_max_memberships; 133extern int sysctl_igmp_max_msf; 134 135struct 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 151struct ip_mc_socklist 152{ 153 struct ip_mc_socklist *next; 154 struct ip_mreqn multi; 155 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 156 struct ip_sf_socklist *sflist; 157}; 158 159struct 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 169struct ip_mc_list 170{ 171 struct in_device *interface; 172 __be32 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 200extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 201extern int igmp_rcv(struct sk_buff *); 202extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 203extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 204extern void ip_mc_drop_socket(struct sock *sk); 205extern int ip_mc_source(int add, int omode, struct sock *sk, 206 struct ip_mreq_source *mreqs, int ifindex); 207extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 208extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 209 struct ip_msfilter __user *optval, int __user *optlen); 210extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 211 struct group_filter __user *optval, int __user *optlen); 212extern int ip_mc_sf_allow(struct sock *sk, u32 local, u32 rmt, int dif); 213extern void ip_mr_init(void); 214extern void ip_mc_init_dev(struct in_device *); 215extern void ip_mc_destroy_dev(struct in_device *); 216extern void ip_mc_up(struct in_device *); 217extern void ip_mc_down(struct in_device *); 218extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); 219extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); 220#endif 221#endif 222