2 * Linux NET3: Internet Group Management Protocol [IGMP]
5 * Alan Cox <Alan.Cox@linux.org>
7 * Extended to talk the BSD extended IGMP protocol of mrouted 3.6
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.
19 #include <asm/byteorder.h>
22 * IGMP protocol structures
26 * Header in on cable format
32 __u8 code
; /* For newer IGMP */
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
53 struct igmpv3_report
{
59 struct igmpv3_grec grec
[0];
67 #if defined(__LITTLE_ENDIAN_BITFIELD)
71 #elif defined(__BIG_ENDIAN_BITFIELD)
76 #error "Please fix <asm/byteorder.h>"
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 */
92 #define IGMP_MTRACE_RESP 0x1e
93 #define IGMP_MTRACE 0x1f
97 * Use the BSD names for these for compatibility
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
106 #define IGMP_MINLEN 8
108 #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
109 /* query (in seconds) */
111 #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */
112 /* specifies time in 10th of seconds */
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. */
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)
125 * struct for keeping the multicast list in
129 #include <linux/skbuff.h>
130 #include <linux/in.h>
132 struct ip_sf_socklist
135 unsigned int sl_count
;
139 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
140 (count) * sizeof(__u32))
142 #define IP_SFBLOCK 10 /* allocate this many at once */
144 /* ip_mc_socklist is real list now. Speed is not argument;
145 this list never used in fast path code
148 struct ip_mc_socklist
150 struct ip_mc_socklist
*next
;
152 struct ip_mreqn multi
;
153 unsigned int sfmode
; /* MCAST_{INCLUDE,EXCLUDE} */
154 struct ip_sf_socklist
*sflist
;
159 struct ip_sf_list
*sf_next
;
161 unsigned long sf_count
[2]; /* include/exclude counts */
162 unsigned char sf_gsresp
; /* include in g & s response? */
163 unsigned char sf_oldin
; /* change state */
164 unsigned char sf_crcount
; /* retrans. left to send */
169 struct in_device
*interface
;
170 unsigned long multiaddr
;
171 struct ip_sf_list
*sources
;
172 struct ip_sf_list
*tomb
;
174 unsigned long sfcount
[2];
175 struct ip_mc_list
*next
;
176 struct timer_list timer
;
182 char unsolicit_count
;
184 unsigned char gsquery
; /* check source marks? */
185 unsigned char crcount
;
188 /* V3 exponential field decoding */
189 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
190 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
191 ((value) < (thresh) ? (value) : \
192 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \
193 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
195 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
196 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
198 extern int ip_check_mc(struct in_device
*dev
, u32 mc_addr
, u32 src_addr
, u16 proto
);
199 extern int igmp_rcv(struct sk_buff
*);
200 extern int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
);
201 extern int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
);
202 extern void ip_mc_drop_socket(struct sock
*sk
);
203 extern int ip_mc_source(int add
, int omode
, struct sock
*sk
,
204 struct ip_mreq_source
*mreqs
, int ifindex
);
205 extern int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
,int ifindex
);
206 extern int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
207 struct ip_msfilter
*optval
, int *optlen
);
208 extern int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
209 struct group_filter
*optval
, int *optlen
);
210 extern int ip_mc_sf_allow(struct sock
*sk
, u32 local
, u32 rmt
, int dif
);
211 extern void ip_mr_init(void);
212 extern void ip_mc_init_dev(struct in_device
*);
213 extern void ip_mc_destroy_dev(struct in_device
*);
214 extern void ip_mc_up(struct in_device
*);
215 extern void ip_mc_down(struct in_device
*);
216 extern void ip_mc_dec_group(struct in_device
*in_dev
, u32 addr
);
217 extern void ip_mc_inc_group(struct in_device
*in_dev
, u32 addr
);