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
igmp_hdr(const struct sk_buff * skb)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 *
igmpv3_report_hdr(const struct sk_buff * skb)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 *
igmpv3_query_hdr(const struct sk_buff * skb)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