1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * Authors: 5 * Alan Cox <[email protected]> 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 __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 45 struct 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 53 struct 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 62 struct 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 #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/timer.h> 131 #include <linux/in.h> 132 133 extern int sysctl_igmp_max_memberships; 134 extern int sysctl_igmp_max_msf; 135 136 struct ip_sf_socklist 137 { 138 unsigned int sl_max; 139 unsigned int sl_count; 140 __be32 sl_addr[0]; 141 }; 142 143 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ 144 (count) * sizeof(__be32)) 145 146 #define IP_SFBLOCK 10 /* allocate this many at once */ 147 148 /* ip_mc_socklist is real list now. Speed is not argument; 149 this list never used in fast path code 150 */ 151 152 struct ip_mc_socklist 153 { 154 struct ip_mc_socklist *next; 155 struct ip_mreqn multi; 156 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 157 struct ip_sf_socklist *sflist; 158 }; 159 160 struct ip_sf_list 161 { 162 struct ip_sf_list *sf_next; 163 __be32 sf_inaddr; 164 unsigned long sf_count[2]; /* include/exclude counts */ 165 unsigned char sf_gsresp; /* include in g & s response? */ 166 unsigned char sf_oldin; /* change state */ 167 unsigned char sf_crcount; /* retrans. left to send */ 168 }; 169 170 struct ip_mc_list 171 { 172 struct in_device *interface; 173 __be32 multiaddr; 174 struct ip_sf_list *sources; 175 struct ip_sf_list *tomb; 176 unsigned int sfmode; 177 unsigned long sfcount[2]; 178 struct ip_mc_list *next; 179 struct timer_list timer; 180 int users; 181 atomic_t refcnt; 182 spinlock_t lock; 183 char tm_running; 184 char reporter; 185 char unsolicit_count; 186 char loaded; 187 unsigned char gsquery; /* check source marks? */ 188 unsigned char crcount; 189 }; 190 191 /* V3 exponential field decoding */ 192 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 193 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ 194 ((value) < (thresh) ? (value) : \ 195 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ 196 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 197 198 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) 199 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) 200 201 extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 202 extern int igmp_rcv(struct sk_buff *); 203 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 204 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 205 extern void ip_mc_drop_socket(struct sock *sk); 206 extern int ip_mc_source(int add, int omode, struct sock *sk, 207 struct ip_mreq_source *mreqs, int ifindex); 208 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 209 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 210 struct ip_msfilter __user *optval, int __user *optlen); 211 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 212 struct group_filter __user *optval, int __user *optlen); 213 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); 214 extern void ip_mr_init(void); 215 extern void ip_mc_init_dev(struct in_device *); 216 extern void ip_mc_destroy_dev(struct in_device *); 217 extern void ip_mc_up(struct in_device *); 218 extern void ip_mc_down(struct in_device *); 219 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); 220 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); 221 extern void ip_mc_rejoin_group(struct ip_mc_list *im); 222 223 #endif 224 #endif 225