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 <linux/ip.h>
22#include <linux/refcount.h>
23#include <uapi/linux/igmp.h>
24
25static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
26{
27 return (struct igmphdr *)skb_transport_header(skb);
28}
29
30static inline struct igmpv3_report *
31 igmpv3_report_hdr(const struct sk_buff *skb)
32{
33 return (struct igmpv3_report *)skb_transport_header(skb);
34}
35
36static inline struct igmpv3_query *
37 igmpv3_query_hdr(const struct sk_buff *skb)
38{
39 return (struct igmpv3_query *)skb_transport_header(skb);
40}
41
42struct ip_sf_socklist {
43 unsigned int sl_max;
44 unsigned int sl_count;
45 struct rcu_head rcu;
46 __be32 sl_addr[0];
47};
48
49#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
50 (count) * sizeof(__be32))
51
52#define IP_SFBLOCK 10 /* allocate this many at once */
53
54/* ip_mc_socklist is real list now. Speed is not argument;
55 this list never used in fast path code
56 */
57
58struct ip_mc_socklist {
59 struct ip_mc_socklist __rcu *next_rcu;
60 struct ip_mreqn multi;
61 unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
62 struct ip_sf_socklist __rcu *sflist;
63 struct rcu_head rcu;
64};
65
66struct ip_sf_list {
67 struct ip_sf_list *sf_next;
68 __be32 sf_inaddr;
69 unsigned long sf_count[2]; /* include/exclude counts */
70 unsigned char sf_gsresp; /* include in g & s response? */
71 unsigned char sf_oldin; /* change state */
72 unsigned char sf_crcount; /* retrans. left to send */
73};
74
75struct ip_mc_list {
76 struct in_device *interface;
77 __be32 multiaddr;
78 unsigned int sfmode;
79 struct ip_sf_list *sources;
80 struct ip_sf_list *tomb;
81 unsigned long sfcount[2];
82 union {
83 struct ip_mc_list *next;
84 struct ip_mc_list __rcu *next_rcu;
85 };
86 struct ip_mc_list __rcu *next_hash;
87 struct timer_list timer;
88 int users;
89 refcount_t refcnt;
90 spinlock_t lock;
91 char tm_running;
92 char reporter;
93 char unsolicit_count;
94 char loaded;
95 unsigned char gsquery; /* check source marks? */
96 unsigned char crcount;
97 struct rcu_head rcu;
98};
99
100/* V3 exponential field decoding */
101#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
102#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
103 ((value) < (thresh) ? (value) : \
104 ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
105 (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
106
107#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
108#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
109
110static inline int ip_mc_may_pull(struct sk_buff *skb, unsigned int len)
111{
112 if (skb_transport_offset(skb) + ip_transport_len(skb) < len)
113 return 0;
114
115 return pskb_may_pull(skb, len);
116}
117
118extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u8 proto);
119extern int igmp_rcv(struct sk_buff *);
120extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
121extern int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
122 unsigned int mode);
123extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
124extern void ip_mc_drop_socket(struct sock *sk);
125extern int ip_mc_source(int add, int omode, struct sock *sk,
126 struct ip_mreq_source *mreqs, int ifindex);
127extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
128extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
129 struct ip_msfilter __user *optval, int __user *optlen);
130extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
131 struct group_filter __user *optval, int __user *optlen);
132extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt,
133 int dif, int sdif);
134extern void ip_mc_init_dev(struct in_device *);
135extern void ip_mc_destroy_dev(struct in_device *);
136extern void ip_mc_up(struct in_device *);
137extern void ip_mc_down(struct in_device *);
138extern void ip_mc_unmap(struct in_device *);
139extern void ip_mc_remap(struct in_device *);
140extern void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp);
141static inline void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
142{
143 return __ip_mc_dec_group(in_dev, addr, GFP_KERNEL);
144}
145extern void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
146 gfp_t gfp);
147extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
148int ip_mc_check_igmp(struct sk_buff *skb);
149
150#endif
151