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 #ifndef _LINUX_IGMP_H
16 #define _LINUX_IGMP_H
17
18 #include <linux/skbuff.h>
19 #include <linux/timer.h>
20 #include <linux/in.h>
21 #include <uapi/linux/igmp.h>
22
igmp_hdr(const struct sk_buff * skb)23 static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
24 {
25 return (struct igmphdr *)skb_transport_header(skb);
26 }
27
28 static inline struct igmpv3_report *
igmpv3_report_hdr(const struct sk_buff * skb)29 igmpv3_report_hdr(const struct sk_buff *skb)
30 {
31 return (struct igmpv3_report *)skb_transport_header(skb);
32 }
33
34 static inline struct igmpv3_query *
igmpv3_query_hdr(const struct sk_buff * skb)35 igmpv3_query_hdr(const struct sk_buff *skb)
36 {
37 return (struct igmpv3_query *)skb_transport_header(skb);
38 }
39
40 extern int sysctl_igmp_llm_reports;
41 extern int sysctl_igmp_max_memberships;
42 extern int sysctl_igmp_max_msf;
43 extern int sysctl_igmp_qrv;
44
45 struct ip_sf_socklist {
46 unsigned int sl_max;
47 unsigned int sl_count;
48 struct rcu_head rcu;
49 __be32 sl_addr[0];
50 };
51
52 #define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
53 (count) * sizeof(__be32))
54
55 #define IP_SFBLOCK 10 /* allocate this many at once */
56
57 /* ip_mc_socklist is real list now. Speed is not argument;
58 this list never used in fast path code
59 */
60
61 struct ip_mc_socklist {
62 struct ip_mc_socklist __rcu *next_rcu;
63 struct ip_mreqn multi;
64 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
65 struct ip_sf_socklist __rcu *sflist;
66 struct rcu_head rcu;
67 };
68
69 struct ip_sf_list {
70 struct ip_sf_list *sf_next;
71 __be32 sf_inaddr;
72 unsigned long sf_count[2]; /* include/exclude counts */
73 unsigned char sf_gsresp; /* include in g & s response? */
74 unsigned char sf_oldin; /* change state */
75 unsigned char sf_crcount; /* retrans. left to send */
76 };
77
78 struct ip_mc_list {
79 struct in_device *interface;
80 __be32 multiaddr;
81 unsigned int sfmode;
82 struct ip_sf_list *sources;
83 struct ip_sf_list *tomb;
84 unsigned long sfcount[2];
85 union {
86 struct ip_mc_list *next;
87 struct ip_mc_list __rcu *next_rcu;
88 };
89 struct ip_mc_list __rcu *next_hash;
90 struct timer_list timer;
91 int users;
92 atomic_t refcnt;
93 spinlock_t lock;
94 char tm_running;
95 char reporter;
96 char unsolicit_count;
97 char loaded;
98 unsigned char gsquery; /* check source marks? */
99 unsigned char crcount;
100 struct rcu_head rcu;
101 };
102
103 /* V3 exponential field decoding */
104 #define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
105 #define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
106 ((value) < (thresh) ? (value) : \
107 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
108 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
109
110 #define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
111 #define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
112
113 extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
114 extern int igmp_rcv(struct sk_buff *);
115 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
116 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
117 extern void ip_mc_drop_socket(struct sock *sk);
118 extern int ip_mc_source(int add, int omode, struct sock *sk,
119 struct ip_mreq_source *mreqs, int ifindex);
120 extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
121 extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
122 struct ip_msfilter __user *optval, int __user *optlen);
123 extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
124 struct group_filter __user *optval, int __user *optlen);
125 extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
126 extern void ip_mc_init_dev(struct in_device *);
127 extern void ip_mc_destroy_dev(struct in_device *);
128 extern void ip_mc_up(struct in_device *);
129 extern void ip_mc_down(struct in_device *);
130 extern void ip_mc_unmap(struct in_device *);
131 extern void ip_mc_remap(struct in_device *);
132 extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
133 extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
134 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed);
135
136 #endif
137