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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 | |
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 * |
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 * |
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 |
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