[mirror_ubuntu-bionic-kernel.git] / include / linux / igmp.h

/*
 *	Linux NET3:	Internet Group Management Protocol  [IGMP]
 *
 *	Authors:
 *		Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 *	Extended to talk the BSD extended IGMP protocol of mrouted 3.6
 *
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_IGMP_H
#define _LINUX_IGMP_H

#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <uapi/linux/igmp.h>

static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
{
	return (struct igmphdr *)skb_transport_header(skb);
}

static inline struct igmpv3_report *
			igmpv3_report_hdr(const struct sk_buff *skb)
{
	return (struct igmpv3_report *)skb_transport_header(skb);
}

static inline struct igmpv3_query *
			igmpv3_query_hdr(const struct sk_buff *skb)
{
	return (struct igmpv3_query *)skb_transport_header(skb);
}

extern int sysctl_igmp_max_memberships;
extern int sysctl_igmp_max_msf;
extern int sysctl_igmp_qrv;

struct ip_sf_socklist {
	unsigned int		sl_max;
	unsigned int		sl_count;
	struct rcu_head		rcu;
	__be32			sl_addr[0];
};

#define IP_SFLSIZE(count)	(sizeof(struct ip_sf_socklist) + \
	(count) * sizeof(__be32))

#define IP_SFBLOCK	10	/* allocate this many at once */

/* ip_mc_socklist is real list now. Speed is not argument;
   this list never used in fast path code
 */

struct ip_mc_socklist {
	struct ip_mc_socklist __rcu *next_rcu;
	struct ip_mreqn		multi;
	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
	struct ip_sf_socklist __rcu	*sflist;
	struct rcu_head		rcu;
};

struct ip_sf_list {
	struct ip_sf_list	*sf_next;
	__be32			sf_inaddr;
	unsigned long		sf_count[2];	/* include/exclude counts */
	unsigned char		sf_gsresp;	/* include in g & s response? */
	unsigned char		sf_oldin;	/* change state */
	unsigned char		sf_crcount;	/* retrans. left to send */
};

struct ip_mc_list {
	struct in_device	*interface;
	__be32			multiaddr;
	unsigned int		sfmode;
	struct ip_sf_list	*sources;
	struct ip_sf_list	*tomb;
	unsigned long		sfcount[2];
	union {
		struct ip_mc_list *next;
		struct ip_mc_list __rcu *next_rcu;
	};
	struct ip_mc_list __rcu *next_hash;
	struct timer_list	timer;
	int			users;
	atomic_t		refcnt;
	spinlock_t		lock;
	char			tm_running;
	char			reporter;
	char			unsolicit_count;
	char			loaded;
	unsigned char		gsquery;	/* check source marks? */
	unsigned char		crcount;
	struct rcu_head		rcu;
};

/* V3 exponential field decoding */
#define IGMPV3_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
#define IGMPV3_EXP(thresh, nbmant, nbexp, value) \
	((value) < (thresh) ? (value) : \
        ((IGMPV3_MASK(value, nbmant) | (1<<(nbmant))) << \
         (IGMPV3_MASK((value) >> (nbmant), nbexp) + (nbexp))))

#define IGMPV3_QQIC(value) IGMPV3_EXP(0x80, 4, 3, value)
#define IGMPV3_MRC(value) IGMPV3_EXP(0x80, 4, 3, value)

extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
extern int igmp_rcv(struct sk_buff *);
extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
extern void ip_mc_drop_socket(struct sock *sk);
extern int ip_mc_source(int add, int omode, struct sock *sk,
		struct ip_mreq_source *mreqs, int ifindex);
extern int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf,int ifindex);
extern int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
		struct ip_msfilter __user *optval, int __user *optlen);
extern int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
		struct group_filter __user *optval, int __user *optlen);
extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
extern void ip_mc_init_dev(struct in_device *);
extern void ip_mc_destroy_dev(struct in_device *);
extern void ip_mc_up(struct in_device *);
extern void ip_mc_down(struct in_device *);
extern void ip_mc_unmap(struct in_device *);
extern void ip_mc_remap(struct in_device *);
extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Linux NET3: Internet Group Management Protocol [IGMP]
	3	*
	4	* Authors:
113aa838	5	* Alan Cox <alan@lxorguk.ukuu.org.uk>
1da177e4 LT	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	*/
1da177e4 LT	15	#ifndef _LINUX_IGMP_H
	16	#define _LINUX_IGMP_H
	17
1da177e4	18	#include <linux/skbuff.h>
d7fe0f24	19	#include <linux/timer.h>
1da177e4	20	#include <linux/in.h>
607ca46e	21	#include <uapi/linux/igmp.h>
1da177e4	22
cc32e054 JP	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 *
	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 *
	35	igmpv3_query_hdr(const struct sk_buff *skb)
	36	{
	37	return (struct igmpv3_query *)skb_transport_header(skb);
	38	}
	39
20380731 ACM	40	extern int sysctl_igmp_max_memberships;
20380731 ACM	41	extern int sysctl_igmp_max_msf;
a9fe8e29	42	extern int sysctl_igmp_qrv;
20380731	43
d94d9fee	44	struct ip_sf_socklist {
1da177e4 LT	45	unsigned int sl_max;
1da177e4 LT	46	unsigned int sl_count;
c85bb41e	47	struct rcu_head rcu;
ea4d9e72	48	__be32 sl_addr[0];
1da177e4 LT	49	};
	50
	51	#define IP_SFLSIZE(count) (sizeof(struct ip_sf_socklist) + \
63007727	52	(count) * sizeof(__be32))
1da177e4 LT	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
d94d9fee	60	struct ip_mc_socklist {
1d7138de	61	struct ip_mc_socklist __rcu *next_rcu;
1da177e4 LT	62	struct ip_mreqn multi;
1da177e4 LT	63	unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
1d7138de	64	struct ip_sf_socklist __rcu *sflist;
c85bb41e	65	struct rcu_head rcu;
1da177e4 LT	66	};
1da177e4 LT	67
d94d9fee	68	struct ip_sf_list {
1da177e4	69	struct ip_sf_list *sf_next;
ea4d9e72	70	__be32 sf_inaddr;
1da177e4 LT	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
d94d9fee	77	struct ip_mc_list {
1da177e4	78	struct in_device *interface;
338fcf98	79	__be32 multiaddr;
1d7138de	80	unsigned int sfmode;
1da177e4 LT	81	struct ip_sf_list *sources;
1da177e4 LT	82	struct ip_sf_list *tomb;
1da177e4	83	unsigned long sfcount[2];
1d7138de ED	84	union {
	85	struct ip_mc_list *next;
	86	struct ip_mc_list __rcu *next_rcu;
	87	};
e9897071	88	struct ip_mc_list __rcu *next_hash;
1da177e4 LT	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;
1d7138de	99	struct rcu_head rcu;
1da177e4 LT	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) : \
fb47ddb2	106	((IGMPV3_MASK(value, nbmant) \| (1<<(nbmant))) << \
1da177e4 LT	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
dbdd9a52	112	extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
1da177e4 LT	113	extern int igmp_rcv(struct sk_buff *);
	114	extern int ip_mc_join_group(struct sock sk, struct ip_mreqn imr);
	115	extern int ip_mc_leave_group(struct sock sk, struct ip_mreqn imr);
	116	extern void ip_mc_drop_socket(struct sock *sk);
	117	extern int ip_mc_source(int add, int omode, struct sock *sk,
	118	struct ip_mreq_source *mreqs, int ifindex);
	119	extern int ip_mc_msfilter(struct sock sk, struct ip_msfilter msf,int ifindex);
	120	extern int ip_mc_msfget(struct sock sk, struct ip_msfilter msf,
	121	struct ip_msfilter __user optval, int __user optlen);
	122	extern int ip_mc_gsfget(struct sock sk, struct group_filter gsf,
	123	struct group_filter __user optval, int __user optlen);
c0cda068	124	extern int ip_mc_sf_allow(struct sock *sk, __be32 local, __be32 rmt, int dif);
1da177e4 LT	125	extern void ip_mc_init_dev(struct in_device *);
	126	extern void ip_mc_destroy_dev(struct in_device *);
	127	extern void ip_mc_up(struct in_device *);
	128	extern void ip_mc_down(struct in_device *);
75c78500 MS	129	extern void ip_mc_unmap(struct in_device *);
75c78500 MS	130	extern void ip_mc_remap(struct in_device *);
8f935bbd AV	131	extern void ip_mc_dec_group(struct in_device *in_dev, __be32 addr);
8f935bbd AV	132	extern void ip_mc_inc_group(struct in_device *in_dev, __be32 addr);
a816c7c7	133
1da177e4	134	#endif