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 __sum16 csum; 34 __be32 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 __be16 grec_nsrcs; 49 __be32 grec_mca; 50 __be32 grec_src[0]; 51}; 52 53struct igmpv3_report { 54 __u8 type; 55 __u8 resv1; 56 __be16 csum; 57 __be16 resv2; 58 __be16 ngrec; 59 struct igmpv3_grec grec[0]; 60}; 61 62struct igmpv3_query { 63 __u8 type; 64 __u8 code; 65 __be16 csum; 66 __be32 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 __be16 nsrcs; 80 __be32 srcs[0]; 81}; 82 83#ifdef __KERNEL__ 84#include <linux/skbuff.h> 85 86static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) 87{ 88 return (struct igmphdr *)skb_transport_header(skb); 89} 90 91static inline struct igmpv3_report * 92 igmpv3_report_hdr(const struct sk_buff *skb) 93{ 94 return (struct igmpv3_report *)skb_transport_header(skb); 95} 96 97static inline struct igmpv3_query * 98 igmpv3_query_hdr(const struct sk_buff *skb) 99{ 100 return (struct igmpv3_query *)skb_transport_header(skb); 101} 102#endif 103 104#define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */ 105#define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */ 106#define IGMP_DVMRP 0x13 /* DVMRP routing */ 107#define IGMP_PIM 0x14 /* PIM routing */ 108#define IGMP_TRACE 0x15 109#define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */ 110#define IGMP_HOST_LEAVE_MESSAGE 0x17 111#define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */ 112 113#define IGMP_MTRACE_RESP 0x1e 114#define IGMP_MTRACE 0x1f 115 116 117/* 118 * Use the BSD names for these for compatibility 119 */ 120 121#define IGMP_DELAYING_MEMBER 0x01 122#define IGMP_IDLE_MEMBER 0x02 123#define IGMP_LAZY_MEMBER 0x03 124#define IGMP_SLEEPING_MEMBER 0x04 125#define IGMP_AWAKENING_MEMBER 0x05 126 127#define IGMP_MINLEN 8 128 129#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */ 130 /* query (in seconds) */ 131 132#define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */ 133 /* specifies time in 10th of seconds */ 134 135#define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */ 136 /* message in this period of time, */ 137 /* revert to IGMP v2 router. */ 138 139#define IGMP_ALL_HOSTS htonl(0xE0000001L) 140#define IGMP_ALL_ROUTER htonl(0xE0000002L) 141#define IGMPV3_ALL_MCR htonl(0xE0000016L) 142#define IGMP_LOCAL_GROUP htonl(0xE0000000L) 143#define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L) 144 145/* 146 * struct for keeping the multicast list in 147 */ 148 149#ifdef __KERNEL__ 150#include <linux/skbuff.h> 151#include <linux/timer.h> 152#include <linux/in.h> 153 154extern int sysctl_igmp_max_memberships; 155extern int sysctl_igmp_max_msf; 156 157struct ip_sf_socklist 158{ 159 unsigned int sl_max; 160 unsigned int sl_count; 161 __be32 sl_addr[0]; 162}; 163 164#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ 165 (count) * sizeof(__be32)) 166 167#define IP_SFBLOCK 10 /* allocate this many at once */ 168 169/* ip_mc_socklist is real list now. Speed is not argument; 170 this list never used in fast path code 171 */ 172 173struct ip_mc_socklist 174{ 175 struct ip_mc_socklist *next; 176 struct ip_mreqn multi; 177 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 178 struct ip_sf_socklist *sflist; 179}; 180 181struct ip_sf_list 182{ 183 struct ip_sf_list *sf_next; 184 __be32 sf_inaddr; 185 unsigned long sf_count[2]; /* include/exclude counts */ 186 unsigned char sf_gsresp; /* include in g & s response? */ 187 unsigned char sf_oldin; /* change state */ 188 unsigned char sf_crcount; /* retrans. left to send */ 189}; 190 191struct ip_mc_list 192{ 193 struct in_device *interface; 194 __be32 multiaddr; 195 struct ip_sf_list *sources; 196 struct ip_sf_list *tomb; 197 unsigned int sfmode; 198 unsigned long sfcount[2]; 199 struct ip_mc_list *next; 200 struct timer_list timer; 201 int users; 202 atomic_t refcnt; 203 spinlock_t lock; 204 char tm_running; 205 char reporter; 206 char unsolicit_count; 207 char loaded; 208 unsigned char gsquery; /* check source marks? */ 209 unsigned char crcount; 210}; 211 212/* V3 exponential field decoding */ 213#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 214#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ 215 ((value) < (thresh) ? (value) : \ 216 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ 217 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 218 219#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) 220#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) 221 222extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 223extern int igmp_rcv(struct sk_buff *); 224extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 225extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 226extern void ip_mc_drop_socket(struct sock *sk); 227extern int ip_mc_source(int add, int omode, struct sock *sk, 228 struct ip_mreq_source *mreqs, int ifindex); 229extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 230extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 231 struct ip_msfilter __user *optval, int __user *optlen); 232extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 233 struct group_filter __user *optval, int __user *optlen); 234extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); 235extern void ip_mr_init(void); 236extern void ip_mc_init_dev(struct in_device *); 237extern void ip_mc_destroy_dev(struct in_device *); 238extern void ip_mc_up(struct in_device *); 239extern void ip_mc_down(struct in_device *); 240extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); 241extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); 242extern void ip_mc_rejoin_group(struct ip_mc_list *im); 243 244#endif 245#endif 246