2 * Linux NET3: Internet Group Management Protocol [IGMP]
5 * Alan Cox <alan@lxorguk.ukuu.org.uk>
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 <linux/types.h>
20 #include <asm/byteorder.h>
23 * IGMP protocol structures
27 * Header in on cable format
33 __u8 code; /* For newer IGMP */
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
54 struct igmpv3_report {
60 struct igmpv3_grec grec[0];
68 #if defined(__LITTLE_ENDIAN_BITFIELD)
72 #elif defined(__BIG_ENDIAN_BITFIELD)
77 #error "Please fix <asm/byteorder.h>"
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 */
93 #define IGMP_MTRACE_RESP 0x1e
94 #define IGMP_MTRACE 0x1f
98 * Use the BSD names for these for compatibility
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
107 #define IGMP_MINLEN 8
109 #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
110 /* query (in seconds) */
112 #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */
113 /* specifies time in 10th of seconds */
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. */
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)
126 * struct for keeping the multicast list in
130 #include <linux/skbuff.h>
131 #include <linux/timer.h>
132 #include <linux/in.h>
134 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
136 return (struct igmphdr *)skb_transport_header(skb);
139 static inline struct igmpv3_report *
140 igmpv3_report_hdr(const struct sk_buff *skb)
142 return (struct igmpv3_report *)skb_transport_header(skb);
145 static inline struct igmpv3_query *
146 igmpv3_query_hdr(const struct sk_buff *skb)
148 return (struct igmpv3_query *)skb_transport_header(skb);
151 extern int sysctl_igmp_max_memberships;
152 extern int sysctl_igmp_max_msf;
154 struct ip_sf_socklist
157 unsigned int sl_count;
161 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
162 (count) * sizeof(__be32))
164 #define IP_SFBLOCK 10 /* allocate this many at once */
166 /* ip_mc_socklist is real list now. Speed is not argument;
167 this list never used in fast path code
170 struct ip_mc_socklist
172 struct ip_mc_socklist *next;
173 struct ip_mreqn multi;
174 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
175 struct ip_sf_socklist *sflist;
180 struct ip_sf_list *sf_next;
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 */
190 struct in_device *interface;
192 struct ip_sf_list *sources;
193 struct ip_sf_list *tomb;
195 unsigned long sfcount[2];
196 struct ip_mc_list *next;
197 struct timer_list timer;
203 char unsolicit_count;
205 unsigned char gsquery; /* check source marks? */
206 unsigned char crcount;
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))))
216 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
217 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
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_dec_group(struct in_device *in_dev, __be32 addr);
237 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
238 extern void ip_mc_rejoin_group(struct ip_mc_list *im);