242 строки
6.3 KiB
C
242 строки
6.3 KiB
C
/*
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* Linux NET3: Internet Group Management Protocol [IGMP]
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*
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* Authors:
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* Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Extended to talk the BSD extended IGMP protocol of mrouted 3.6
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IGMP_H
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#define _LINUX_IGMP_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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/*
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* IGMP protocol structures
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*/
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/*
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* Header in on cable format
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*/
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struct igmphdr
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{
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__u8 type;
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__u8 code; /* For newer IGMP */
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__sum16 csum;
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__be32 group;
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};
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/* V3 group record types [grec_type] */
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#define IGMPV3_MODE_IS_INCLUDE 1
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#define IGMPV3_MODE_IS_EXCLUDE 2
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#define IGMPV3_CHANGE_TO_INCLUDE 3
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#define IGMPV3_CHANGE_TO_EXCLUDE 4
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#define IGMPV3_ALLOW_NEW_SOURCES 5
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#define IGMPV3_BLOCK_OLD_SOURCES 6
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struct igmpv3_grec {
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__u8 grec_type;
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__u8 grec_auxwords;
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__be16 grec_nsrcs;
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__be32 grec_mca;
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__be32 grec_src[0];
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};
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struct igmpv3_report {
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__u8 type;
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__u8 resv1;
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__be16 csum;
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__be16 resv2;
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__be16 ngrec;
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struct igmpv3_grec grec[0];
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};
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struct igmpv3_query {
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__u8 type;
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__u8 code;
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__be16 csum;
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__be32 group;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 qrv:3,
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suppress:1,
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resv:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 resv:4,
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suppress:1,
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qrv:3;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 qqic;
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__be16 nsrcs;
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__be32 srcs[0];
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};
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#define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */
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#define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */
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#define IGMP_DVMRP 0x13 /* DVMRP routing */
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#define IGMP_PIM 0x14 /* PIM routing */
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#define IGMP_TRACE 0x15
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#define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */
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#define IGMP_HOST_LEAVE_MESSAGE 0x17
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#define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */
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#define IGMP_MTRACE_RESP 0x1e
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#define IGMP_MTRACE 0x1f
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/*
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* Use the BSD names for these for compatibility
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*/
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#define IGMP_DELAYING_MEMBER 0x01
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#define IGMP_IDLE_MEMBER 0x02
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#define IGMP_LAZY_MEMBER 0x03
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#define IGMP_SLEEPING_MEMBER 0x04
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#define IGMP_AWAKENING_MEMBER 0x05
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#define IGMP_MINLEN 8
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#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
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/* query (in seconds) */
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#define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */
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/* specifies time in 10th of seconds */
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#define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */
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/* message in this period of time, */
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/* revert to IGMP v2 router. */
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#define IGMP_ALL_HOSTS htonl(0xE0000001L)
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#define IGMP_ALL_ROUTER htonl(0xE0000002L)
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#define IGMPV3_ALL_MCR htonl(0xE0000016L)
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#define IGMP_LOCAL_GROUP htonl(0xE0000000L)
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#define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L)
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/*
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* struct for keeping the multicast list in
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*/
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#ifdef __KERNEL__
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#include <linux/skbuff.h>
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#include <linux/timer.h>
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#include <linux/in.h>
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static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
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{
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return (struct igmphdr *)skb_transport_header(skb);
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}
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static inline struct igmpv3_report *
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igmpv3_report_hdr(const struct sk_buff *skb)
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{
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return (struct igmpv3_report *)skb_transport_header(skb);
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}
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static inline struct igmpv3_query *
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igmpv3_query_hdr(const struct sk_buff *skb)
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{
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return (struct igmpv3_query *)skb_transport_header(skb);
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}
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extern int sysctl_igmp_max_memberships;
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extern int sysctl_igmp_max_msf;
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struct ip_sf_socklist
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{
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unsigned int sl_max;
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unsigned int sl_count;
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__be32 sl_addr[0];
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};
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#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
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(count) * sizeof(__be32))
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#define IP_SFBLOCK 10 /* allocate this many at once */
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/* ip_mc_socklist is real list now. Speed is not argument;
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this list never used in fast path code
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*/
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struct ip_mc_socklist
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{
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struct ip_mc_socklist *next;
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struct ip_mreqn multi;
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unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
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struct ip_sf_socklist *sflist;
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};
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struct ip_sf_list
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{
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struct ip_sf_list *sf_next;
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__be32 sf_inaddr;
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unsigned long sf_count[2]; /* include/exclude counts */
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unsigned char sf_gsresp; /* include in g & s response? */
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unsigned char sf_oldin; /* change state */
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unsigned char sf_crcount; /* retrans. left to send */
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};
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struct ip_mc_list
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{
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struct in_device *interface;
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__be32 multiaddr;
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struct ip_sf_list *sources;
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struct ip_sf_list *tomb;
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unsigned int sfmode;
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unsigned long sfcount[2];
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struct ip_mc_list *next;
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struct timer_list timer;
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int users;
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atomic_t refcnt;
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spinlock_t lock;
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char tm_running;
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char reporter;
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char unsolicit_count;
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char loaded;
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unsigned char gsquery; /* check source marks? */
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unsigned char crcount;
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};
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/* V3 exponential field decoding */
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#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
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#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
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((value) < (thresh) ? (value) : \
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((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
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(IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
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#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
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#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
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extern int ip_check_mc(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
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extern int igmp_rcv(struct sk_buff *);
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extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
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extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
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extern void ip_mc_drop_socket(struct sock *sk);
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extern int ip_mc_source(int add, int omode, struct sock *sk,
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struct ip_mreq_source *mreqs, int ifindex);
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extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
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extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
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struct ip_msfilter __user *optval, int __user *optlen);
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extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
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struct group_filter __user *optval, int __user *optlen);
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extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
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extern void ip_mc_init_dev(struct in_device *);
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extern void ip_mc_destroy_dev(struct in_device *);
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extern void ip_mc_up(struct in_device *);
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extern void ip_mc_down(struct in_device *);
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extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
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extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
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extern void ip_mc_rejoin_group(struct ip_mc_list *im);
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#endif
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#endif
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