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 <linux/types.h> 20 #include <asm/byteorder.h> 21 22 /* 23 * IGMP protocol structures 24 */ 25 26 /* 27 * Header in on cable format 28 */ 29 30 struct igmphdr 31 { 32 __u8 type; 33 __u8 code; /* For newer IGMP */ 34 __sum16 csum; 35 __be32 group; 36 }; 37 38 /* V3 group record types [grec_type] */ 39 #define IGMPV3_MODE_IS_INCLUDE 1 40 #define IGMPV3_MODE_IS_EXCLUDE 2 41 #define IGMPV3_CHANGE_TO_INCLUDE 3 42 #define IGMPV3_CHANGE_TO_EXCLUDE 4 43 #define IGMPV3_ALLOW_NEW_SOURCES 5 44 #define IGMPV3_BLOCK_OLD_SOURCES 6 45 46 struct igmpv3_grec { 47 __u8 grec_type; 48 __u8 grec_auxwords; 49 __be16 grec_nsrcs; 50 __be32 grec_mca; 51 __be32 grec_src[0]; 52 }; 53 54 struct igmpv3_report { 55 __u8 type; 56 __u8 resv1; 57 __be16 csum; 58 __be16 resv2; 59 __be16 ngrec; 60 struct igmpv3_grec grec[0]; 61 }; 62 63 struct igmpv3_query { 64 __u8 type; 65 __u8 code; 66 __be16 csum; 67 __be32 group; 68 #if defined(__LITTLE_ENDIAN_BITFIELD) 69 __u8 qrv:3, 70 suppress:1, 71 resv:4; 72 #elif defined(__BIG_ENDIAN_BITFIELD) 73 __u8 resv:4, 74 suppress:1, 75 qrv:3; 76 #else 77 #error "Please fix <asm/byteorder.h>" 78 #endif 79 __u8 qqic; 80 __be16 nsrcs; 81 __be32 srcs[0]; 82 }; 83 84 #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */ 85 #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */ 86 #define IGMP_DVMRP 0x13 /* DVMRP routing */ 87 #define IGMP_PIM 0x14 /* PIM routing */ 88 #define IGMP_TRACE 0x15 89 #define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */ 90 #define IGMP_HOST_LEAVE_MESSAGE 0x17 91 #define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */ 92 93 #define IGMP_MTRACE_RESP 0x1e 94 #define IGMP_MTRACE 0x1f 95 96 97 /* 98 * Use the BSD names for these for compatibility 99 */ 100 101 #define IGMP_DELAYING_MEMBER 0x01 102 #define IGMP_IDLE_MEMBER 0x02 103 #define IGMP_LAZY_MEMBER 0x03 104 #define IGMP_SLEEPING_MEMBER 0x04 105 #define IGMP_AWAKENING_MEMBER 0x05 106 107 #define IGMP_MINLEN 8 108 109 #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */ 110 /* query (in seconds) */ 111 112 #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */ 113 /* specifies time in 10th of seconds */ 114 115 #define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */ 116 /* message in this period of time, */ 117 /* revert to IGMP v2 router. */ 118 119 #define IGMP_ALL_HOSTS htonl(0xE0000001L) 120 #define IGMP_ALL_ROUTER htonl(0xE0000002L) 121 #define IGMPV3_ALL_MCR htonl(0xE0000016L) 122 #define IGMP_LOCAL_GROUP htonl(0xE0000000L) 123 #define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L) 124 125 /* 126 * struct for keeping the multicast list in 127 */ 128 129 #ifdef __KERNEL__ 130 #include <linux/skbuff.h> 131 #include <linux/timer.h> 132 #include <linux/in.h> 133 134 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) 135 { 136 return (struct igmphdr *)skb_transport_header(skb); 137 } 138 139 static inline struct igmpv3_report * 140 igmpv3_report_hdr(const struct sk_buff *skb) 141 { 142 return (struct igmpv3_report *)skb_transport_header(skb); 143 } 144 145 static inline struct igmpv3_query * 146 igmpv3_query_hdr(const struct sk_buff *skb) 147 { 148 return (struct igmpv3_query *)skb_transport_header(skb); 149 } 150 151 extern int sysctl_igmp_max_memberships; 152 extern int sysctl_igmp_max_msf; 153 154 struct ip_sf_socklist 155 { 156 unsigned int sl_max; 157 unsigned int sl_count; 158 __be32 sl_addr[0]; 159 }; 160 161 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ 162 (count) * sizeof(__be32)) 163 164 #define IP_SFBLOCK 10 /* allocate this many at once */ 165 166 /* ip_mc_socklist is real list now. Speed is not argument; 167 this list never used in fast path code 168 */ 169 170 struct ip_mc_socklist 171 { 172 struct ip_mc_socklist *next; 173 struct ip_mreqn multi; 174 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 175 struct ip_sf_socklist *sflist; 176 }; 177 178 struct ip_sf_list 179 { 180 struct ip_sf_list *sf_next; 181 __be32 sf_inaddr; 182 unsigned long sf_count[2]; /* include/exclude counts */ 183 unsigned char sf_gsresp; /* include in g & s response? */ 184 unsigned char sf_oldin; /* change state */ 185 unsigned char sf_crcount; /* retrans. left to send */ 186 }; 187 188 struct ip_mc_list 189 { 190 struct in_device *interface; 191 __be32 multiaddr; 192 struct ip_sf_list *sources; 193 struct ip_sf_list *tomb; 194 unsigned int sfmode; 195 unsigned long sfcount[2]; 196 struct ip_mc_list *next; 197 struct timer_list timer; 198 int users; 199 atomic_t refcnt; 200 spinlock_t lock; 201 char tm_running; 202 char reporter; 203 char unsolicit_count; 204 char loaded; 205 unsigned char gsquery; /* check source marks? */ 206 unsigned char crcount; 207 }; 208 209 /* V3 exponential field decoding */ 210 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 211 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ 212 ((value) < (thresh) ? (value) : \ 213 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ 214 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 215 216 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) 217 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) 218 219 extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 220 extern int igmp_rcv(struct sk_buff *); 221 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 222 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 223 extern void ip_mc_drop_socket(struct sock *sk); 224 extern int ip_mc_source(int add, int omode, struct sock *sk, 225 struct ip_mreq_source *mreqs, int ifindex); 226 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 227 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 228 struct ip_msfilter __user *optval, int __user *optlen); 229 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 230 struct group_filter __user *optval, int __user *optlen); 231 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); 232 extern void ip_mc_init_dev(struct in_device *); 233 extern void ip_mc_destroy_dev(struct in_device *); 234 extern void ip_mc_up(struct in_device *); 235 extern void ip_mc_down(struct in_device *); 236 extern void ip_mc_unmap(struct in_device *); 237 extern void ip_mc_remap(struct in_device *); 238 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); 239 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); 240 extern void ip_mc_rejoin_group(struct ip_mc_list *im); 241 242 #endif 243 #endif 244