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/* * Linux NET3: Internet Group Management Protocol [IGMP] * * Authors: * Alan Cox <Alan.Cox@linux.org> * * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _LINUX_IGMP_H #define _LINUX_IGMP_H #include <asm/byteorder.h> /* * IGMP protocol structures */ /* * Header in on cable format */ struct igmphdr { __u8 type; __u8 code; /* For newer IGMP */ __u16 csum; __u32 group; }; /* V3 group record types [grec_type] */ #define IGMPV3_MODE_IS_INCLUDE 1 #define IGMPV3_MODE_IS_EXCLUDE 2 #define IGMPV3_CHANGE_TO_INCLUDE 3 #define IGMPV3_CHANGE_TO_EXCLUDE 4 #define IGMPV3_ALLOW_NEW_SOURCES 5 #define IGMPV3_BLOCK_OLD_SOURCES 6 struct igmpv3_grec { __u8 grec_type; __u8 grec_auxwords; __u16 grec_nsrcs; __u32 grec_mca; __u32 grec_src[0]; }; struct igmpv3_report { __u8 type; __u8 resv1; __u16 csum; __u16 resv2; __u16 ngrec; struct igmpv3_grec grec[0]; }; struct igmpv3_query { __u8 type; __u8 code; __u16 csum; __u32 group; #if defined(__LITTLE_ENDIAN_BITFIELD) __u8 qrv:3, suppress:1, resv:4; #elif defined(__BIG_ENDIAN_BITFIELD) __u8 resv:4, suppress:1, qrv:3; #else #error "Please fix <asm/byteorder.h>" #endif __u8 qqic; __u16 nsrcs; __u32 srcs[0]; }; #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */ #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */ #define IGMP_DVMRP 0x13 /* DVMRP routing */ #define IGMP_PIM 0x14 /* PIM routing */ #define IGMP_TRACE 0x15 #define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */ #define IGMP_HOST_LEAVE_MESSAGE 0x17 #define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */ #define IGMP_MTRACE_RESP 0x1e #define IGMP_MTRACE 0x1f /* * Use the BSD names for these for compatibility */ #define IGMP_DELAYING_MEMBER 0x01 #define IGMP_IDLE_MEMBER 0x02 #define IGMP_LAZY_MEMBER 0x03 #define IGMP_SLEEPING_MEMBER 0x04 #define IGMP_AWAKENING_MEMBER 0x05 #define IGMP_MINLEN 8 #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */ /* query (in seconds) */ #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */ /* specifies time in 10th of seconds */ #define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */ /* message in this period of time, */ /* revert to IGMP v2 router. */ #define IGMP_ALL_HOSTS htonl(0xE0000001L) #define IGMP_ALL_ROUTER htonl(0xE0000002L) #define IGMPV3_ALL_MCR htonl(0xE0000016L) #define IGMP_LOCAL_GROUP htonl(0xE0000000L) #define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L) /* * struct for keeping the multicast list in */ #ifdef __KERNEL__ #include <linux/skbuff.h> #include <linux/in.h> extern int sysctl_igmp_max_memberships; extern int sysctl_igmp_max_msf; struct ip_sf_socklist { unsigned int sl_max; unsigned int sl_count; __u32 sl_addr[0]; }; #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \ (count) * sizeof(__u32)) #define IP_SFBLOCK 10 /* allocate this many at once */ /* ip_mc_socklist is real list now. Speed is not argument; this list never used in fast path code */ struct ip_mc_socklist { struct ip_mc_socklist *next; struct ip_mreqn multi; unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */ struct ip_sf_socklist *sflist; }; struct ip_sf_list { struct ip_sf_list *sf_next; __u32 sf_inaddr; unsigned long sf_count[2]; /* include/exclude counts */ unsigned char sf_gsresp; /* include in g & s response? */ unsigned char sf_oldin; /* change state */ unsigned char sf_crcount; /* retrans. left to send */ }; struct ip_mc_list { struct in_device *interface; unsigned long multiaddr; struct ip_sf_list *sources; struct ip_sf_list *tomb; unsigned int sfmode; unsigned long sfcount[2]; struct ip_mc_list *next; struct timer_list timer; int users; atomic_t refcnt; spinlock_t lock; char tm_running; char reporter; char unsolicit_count; char loaded; unsigned char gsquery; /* check source marks? */ unsigned char crcount; }; /* V3 exponential field decoding */ #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \ ((value) < (thresh) ? (value) : \ ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \ (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp)))) #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value) #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value) extern int ip_check_mc(struct in_device *dev, u32 mc_addr, u32 src_addr, u16 proto); extern int igmp_rcv(struct sk_buff *); extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr); extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr); extern void ip_mc_drop_socket(struct sock *sk); extern int ip_mc_source(int add, int omode, struct sock *sk, struct ip_mreq_source *mreqs, int ifindex); extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex); extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, struct ip_msfilter __user *optval, int __user *optlen); extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, struct group_filter __user *optval, int __user *optlen); extern int ip_mc_sf_allow(struct sock *sk, u32 local, u32 rmt, int dif); extern void ip_mr_init(void); extern void ip_mc_init_dev(struct in_device *); extern void ip_mc_destroy_dev(struct in_device *); extern void ip_mc_up(struct in_device *); extern void ip_mc_down(struct in_device *); extern void ip_mc_dec_group(struct in_device *in_dev, u32 addr); extern void ip_mc_inc_group(struct in_device *in_dev, u32 addr); #endif #endif