1 /* 2 * Linux NET3: Internet Group Management Protocol [IGMP] 3 * 4 * Authors: 5 * Alan Cox <alan@lxorguk.ukuu.org.uk> 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 __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 0x12 */ 89 #define IGMP_HOST_LEAVE_MESSAGE 0x17 90 #define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x12 */ 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 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb) 134 { 135 return (struct igmphdr *)skb_transport_header(skb); 136 } 137 138 static inline struct igmpv3_report * 139 igmpv3_report_hdr(const struct sk_buff *skb) 140 { 141 return (struct igmpv3_report *)skb_transport_header(skb); 142 } 143 144 static inline struct igmpv3_query * 145 igmpv3_query_hdr(const struct sk_buff *skb) 146 { 147 return (struct igmpv3_query *)skb_transport_header(skb); 148 } 149 150 extern int sysctl_igmp_max_memberships; 151 extern int sysctl_igmp_max_msf; 152 153 struct ip_sf_socklist { 154 unsigned int sl_max; 155 unsigned int sl_count; 156 struct rcu_head rcu; 157 __be32 sl_addr[0]; 158 }; 159 160 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ 161 (count) * sizeof(__be32)) 162 163 #define IP_SFBLOCK 10 /* allocate this many at once */ 164 165 /* ip_mc_socklist is real list now. Speed is not argument; 166 this list never used in fast path code 167 */ 168 169 struct ip_mc_socklist { 170 struct ip_mc_socklist __rcu *next_rcu; 171 struct ip_mreqn multi; 172 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ 173 struct ip_sf_socklist __rcu *sflist; 174 struct rcu_head rcu; 175 }; 176 177 struct ip_sf_list { 178 struct ip_sf_list *sf_next; 179 __be32 sf_inaddr; 180 unsigned long sf_count[2]; /* include/exclude counts */ 181 unsigned char sf_gsresp; /* include in g & s response? */ 182 unsigned char sf_oldin; /* change state */ 183 unsigned char sf_crcount; /* retrans. left to send */ 184 }; 185 186 struct ip_mc_list { 187 struct in_device *interface; 188 __be32 multiaddr; 189 unsigned int sfmode; 190 struct ip_sf_list *sources; 191 struct ip_sf_list *tomb; 192 unsigned long sfcount[2]; 193 union { 194 struct ip_mc_list *next; 195 struct ip_mc_list __rcu *next_rcu; 196 }; 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 struct rcu_head rcu; 208 }; 209 210 /* V3 exponential field decoding */ 211 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) 212 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ 213 ((value) < (thresh) ? (value) : \ 214 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \ 215 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) 216 217 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) 218 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) 219 220 extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto); 221 extern int igmp_rcv(struct sk_buff *); 222 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); 223 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); 224 extern void ip_mc_drop_socket(struct sock *sk); 225 extern int ip_mc_source(int add, int omode, struct sock *sk, 226 struct ip_mreq_source *mreqs, int ifindex); 227 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); 228 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, 229 struct ip_msfilter __user *optval, int __user *optlen); 230 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, 231 struct group_filter __user *optval, int __user *optlen); 232 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif); 233 extern void ip_mc_init_dev(struct in_device *); 234 extern void ip_mc_destroy_dev(struct in_device *); 235 extern void ip_mc_up(struct in_device *); 236 extern void ip_mc_down(struct in_device *); 237 extern void ip_mc_unmap(struct in_device *); 238 extern void ip_mc_remap(struct in_device *); 239 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr); 240 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr); 241 extern void ip_mc_rejoin_groups(struct in_device *in_dev); 242 243 #endif 244 #endif 245