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
23static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
24{
25	return (struct igmphdr *)skb_transport_header(skb);
26}
27
28static inline struct igmpv3_report *
29			igmpv3_report_hdr(const struct sk_buff *skb)
30{
31	return (struct igmpv3_report *)skb_transport_header(skb);
32}
33
34static inline struct igmpv3_query *
35			igmpv3_query_hdr(const struct sk_buff *skb)
36{
37	return (struct igmpv3_query *)skb_transport_header(skb);
38}
39
40extern int sysctl_igmp_max_memberships;
41extern int sysctl_igmp_max_msf;
42extern int sysctl_igmp_qrv;
43
44struct ip_sf_socklist {
45	unsigned int		sl_max;
46	unsigned int		sl_count;
47	struct rcu_head		rcu;
48	__be32			sl_addr[0];
49};
50
51#define IP_SFLSIZE(count)	(sizeof(struct ip_sf_socklist) + \
52	(count) * sizeof(__be32))
53
54#define IP_SFBLOCK	10	/* allocate this many at once */
55
56/* ip_mc_socklist is real list now. Speed is not argument;
57   this list never used in fast path code
58 */
59
60struct ip_mc_socklist {
61	struct ip_mc_socklist __rcu *next_rcu;
62	struct ip_mreqn		multi;
63	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
64	struct ip_sf_socklist __rcu	*sflist;
65	struct rcu_head		rcu;
66};
67
68struct ip_sf_list {
69	struct ip_sf_list	*sf_next;
70	__be32			sf_inaddr;
71	unsigned long		sf_count[2];	/* include/exclude counts */
72	unsigned char		sf_gsresp;	/* include in g & s response? */
73	unsigned char		sf_oldin;	/* change state */
74	unsigned char		sf_crcount;	/* retrans. left to send */
75};
76
77struct ip_mc_list {
78	struct in_device	*interface;
79	__be32			multiaddr;
80	unsigned int		sfmode;
81	struct ip_sf_list	*sources;
82	struct ip_sf_list	*tomb;
83	unsigned long		sfcount[2];
84	union {
85		struct ip_mc_list *next;
86		struct ip_mc_list __rcu *next_rcu;
87	};
88	struct ip_mc_list __rcu *next_hash;
89	struct timer_list	timer;
90	int			users;
91	atomic_t		refcnt;
92	spinlock_t		lock;
93	char			tm_running;
94	char			reporter;
95	char			unsolicit_count;
96	char			loaded;
97	unsigned char		gsquery;	/* check source marks? */
98	unsigned char		crcount;
99	struct rcu_head		rcu;
100};
101
102/* V3 exponential field decoding */
103#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
104#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
105	((value) < (thresh) ? (value) : \
106        ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
107         (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))
108
109#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
110#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)
111
112extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
113extern int igmp_rcv(struct sk_buff *);
114extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
115extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
116extern void ip_mc_drop_socket(struct sock *sk);
117extern int ip_mc_source(int add, int omode, struct sock *sk,
118		struct ip_mreq_source *mreqs, int ifindex);
119extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
120extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
121		struct ip_msfilter __user *optval, int __user *optlen);
122extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
123		struct group_filter __user *optval, int __user *optlen);
124extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
125extern void ip_mc_init_dev(struct in_device *);
126extern void ip_mc_destroy_dev(struct in_device *);
127extern void ip_mc_up(struct in_device *);
128extern void ip_mc_down(struct in_device *);
129extern void ip_mc_unmap(struct in_device *);
130extern void ip_mc_remap(struct in_device *);
131extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
132extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
133
134#endif
135