xref: /freebsd-11-stable/sys/netinet/in_pcb.h

/*
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)in_pcb.h	8.1 (Berkeley) 6/10/93
 * $FreeBSD: head/sys/netinet/in_pcb.h 53541 1999-11-22 02:45:11Z shin $
 */

#ifndef _NETINET_IN_PCB_H_
#define _NETINET_IN_PCB_H_

#include <sys/queue.h>


#include <netinet6/ipsec.h> /* for IPSEC */

#define	in6pcb		inpcb	/* for KAME src sync over BSD*'s */
#define	in6p_sp		inp_sp	/* for KAME src sync over BSD*'s */

/*
 * Common structure pcb for internet protocol implementation.
 * Here are stored pointers to local and foreign host table
 * entries, local and foreign socket numbers, and pointers
 * up (to a socket structure) and down (to a protocol-specific)
 * control block.
 */
LIST_HEAD(inpcbhead, inpcb);
LIST_HEAD(inpcbporthead, inpcbport);
typedef	u_quad_t	inp_gen_t;

/*
 * PCB with AF_INET6 null bind'ed laddr can receive AF_INET input packet.
 * So, AF_INET6 null laddr is also used as AF_INET null laddr,
 * by utilize following structure. (At last, same as INRIA)
 */
struct in_addr_4in6 {
	u_int32_t	ia46_pad32[3];
	struct	in_addr	ia46_addr4;
};

/*
 * NB: the zone allocator is type-stable EXCEPT FOR THE FIRST TWO LONGS
 * of the structure.  Therefore, it is important that the members in
 * that position not contain any information which is required to be
 * stable.
 */
struct	icmp6_filter;

struct inpcb {
	LIST_ENTRY(inpcb) inp_hash; /* hash list */
	u_short	inp_fport;		/* foreign port */
	u_short	inp_lport;		/* local port */
	LIST_ENTRY(inpcb) inp_list; /* list for all PCBs of this proto */
	u_int32_t	inp_flow;

	/* protocol dependent part, local and foreign addr */
	union {
		/* foreign host table entry */
		struct	in_addr_4in6 inp46_foreign;
		struct	in6_addr inp6_foreign;
	} inp_dependfaddr;
	union {
		/* local host table entry */
		struct	in_addr_4in6 inp46_local;
		struct	in6_addr inp6_local;
	} inp_dependladdr;

	caddr_t	inp_ppcb;		/* pointer to per-protocol pcb */
	struct	inpcbinfo *inp_pcbinfo;	/* PCB list info */
	struct	socket *inp_socket;	/* back pointer to socket */
					/* list for this PCB's local port */
	int	inp_flags;		/* generic IP/datagram flags */

	/* protocol dependent part; cached route */
	union {
		/* placeholder for routing entry */
		struct	route inp4_route;
		struct	route_in6 inp6_route;
	} inp_dependroute;

	struct	inpcbpolicy *inp_sp; /* for IPSEC */
	u_char	inp_vflag;
#define	INP_IPV4	0x1
#define	INP_IPV6	0x2
	u_char	inp_ip_ttl;		/* time to live proto */
	u_char	inp_ip_p;		/* protocol proto */

	/* protocol dependent part; options */
	struct {
		u_char	inp4_ip_tos;		/* type of service proto */
		struct	mbuf *inp4_options;	/* IP options */
		struct	ip_moptions *inp4_moptions; /* IP multicast options */
	} inp_depend4;
#define	inp_faddr	inp_dependfaddr.inp46_foreign.ia46_addr4
#define	inp_laddr	inp_dependladdr.inp46_local.ia46_addr4
#define	inp_route	inp_dependroute.inp4_route
#define	inp_ip_tos	inp_depend4.inp4_ip_tos
#define	inp_options	inp_depend4.inp4_options
#define	inp_moptions	inp_depend4.inp4_moptions
	struct {
		/* IP options */
		struct	mbuf *inp6_options;
		/* IP6 options for outgoing packets */
		struct	ip6_pktopts *inp6_outputopts;
		/* IP multicast options */
		struct	ip6_moptions *inp6_moptions;
		/* ICMPv6 code type filter */
		struct	icmp6_filter *inp6_icmp6filt;
		/* IPV6_CHECKSUM setsockopt */
		int	inp6_cksum;
		u_short	inp6_ifindex;
		short	inp6_hops;
		u_int8_t	inp6_hlim;
	} inp_depend6;
	LIST_ENTRY(inpcb) inp_portlist;
	struct	inpcbport *inp_phd;	/* head of this list */
	inp_gen_t	inp_gencnt;	/* generation count of this instance */
#define	in6p_faddr	inp_dependfaddr.inp6_foreign
#define	in6p_laddr	inp_dependladdr.inp6_local
#define	in6p_route	inp_dependroute.inp6_route
#define	in6p_ip6_hlim	inp_depend6.inp6_hlim
#define	in6p_hops	inp_depend6.inp6_hops	/* default hop limit */
#define	in6p_ip6_nxt	inp_ip_p
#define	in6p_flowinfo	inp_flow
#define	in6p_vflag	inp_vflag
#define	in6p_options	inp_depend6.inp6_options
#define	in6p_outputopts	inp_depend6.inp6_outputopts
#define	in6p_moptions	inp_depend6.inp6_moptions
#define	in6p_icmp6filt	inp_depend6.inp6_icmp6filt
#define	in6p_cksum	inp_depend6.inp6_cksum
#define	inp6_ifindex	inp_depend6.inp6_ifindex
#define	in6p_flags	inp_flags  /* for KAME src sync over BSD*'s */
#define	in6p_socket	inp_socket  /* for KAME src sync over BSD*'s */
#define	in6p_lport	inp_lport  /* for KAME src sync over BSD*'s */
#define	in6p_fport	inp_fport  /* for KAME src sync over BSD*'s */
#define	in6p_ppcb	inp_ppcb  /* for KAME src sync over BSD*'s */
};
/*
 * The range of the generation count, as used in this implementation,
 * is 9e19.  We would have to create 300 billion connections per
 * second for this number to roll over in a year.  This seems sufficiently
 * unlikely that we simply don't concern ourselves with that possibility.
 */

/*
 * Interface exported to userland by various protocols which use
 * inpcbs.  Hack alert -- only define if struct xsocket is in scope.
 */
#ifdef _SYS_SOCKETVAR_H_
struct	xinpcb {
	size_t	xi_len;		/* length of this structure */
	struct	inpcb xi_inp;
	struct	xsocket xi_socket;
	u_quad_t	xi_alignment_hack;
};

struct	xinpgen {
	size_t	xig_len;	/* length of this structure */
	u_int	xig_count;	/* number of PCBs at this time */
	inp_gen_t xig_gen;	/* generation count at this time */
	so_gen_t xig_sogen;	/* socket generation count at this time */
};
#endif /* _SYS_SOCKETVAR_H_ */

struct inpcbport {
	LIST_ENTRY(inpcbport) phd_hash;
	struct inpcbhead phd_pcblist;
	u_short phd_port;
};

struct inpcbinfo {		/* XXX documentation, prefixes */
	struct	inpcbhead *hashbase;
	u_long	hashmask;
	struct	inpcbporthead *porthashbase;
	u_long	porthashmask;
	struct	inpcbhead *listhead;
	u_short	lastport;
	u_short	lastlow;
	u_short	lasthi;
	struct	vm_zone *ipi_zone; /* zone to allocate pcbs from */
	u_int	ipi_count;	/* number of pcbs in this list */
	u_quad_t ipi_gencnt;	/* current generation count */
};

#define INP_PCBHASH(faddr, lport, fport, mask) \
	(((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
#define INP_PCBPORTHASH(lport, mask) \
	(ntohs((lport)) & (mask))

/* flags in inp_flags: */
#define	INP_RECVOPTS		0x01	/* receive incoming IP options */
#define	INP_RECVRETOPTS		0x02	/* receive IP options for reply */
#define	INP_RECVDSTADDR		0x04	/* receive IP dst address */
#define	INP_HDRINCL		0x08	/* user supplies entire IP header */
#define	INP_HIGHPORT		0x10	/* user wants "high" port binding */
#define	INP_LOWPORT		0x20	/* user wants "low" port binding */
#define	INP_ANONPORT		0x40	/* port chosen for user */
#define	INP_RECVIF		0x80	/* receive incoming interface */
#define	INP_MTUDISC		0x100	/* user can do MTU discovery */
#define	INP_FAITH		0x200	/* accept FAITH'ed connections */
#define	IN6P_PKTINFO		0x010000
#define	IN6P_HOPLIMIT		0x020000
#define	IN6P_NEXTHOP		0x040000
#define	IN6P_HOPOPTS		0x080000
#define	IN6P_DSTOPTS		0x100000
#define	IN6P_RTHDR		0x200000
#define	IN6P_BINDV6ONLY		0x400000
#define	INP_CONTROLOPTS		(INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
					INP_RECVIF|\
				 IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_NEXTHOP|\
				 IN6P_HOPOPTS|IN6P_DSTOPTS|IN6P_RTHDR)

#define	INP_UNMAPPABLEOPTS	(IN6P_HOPOPTS|IN6P_DSTOPTS|IN6P_RTHDR)

 /* for KAME src sync over BSD*'s */
#define	IN6P_RECVOPTS		INP_RECVOPTS
#define	IN6P_RECVRETOPTS	INP_RECVRETOPTS
#define	IN6P_RECVDSTADDR	INP_RECVDSTADDR
#define	IN6P_HDRINCL		INP_HDRINCL
#define	IN6P_HIGHPORT		INP_HIGHPORT
#define	IN6P_LOWPORT		INP_LOWPORT
#define	IN6P_ANONPORT		INP_ANONPORT
#define	IN6P_RECVIF		INP_RECVIF
#define	IN6P_MTUDISC		INP_MTUDISC
#define	IN6P_FAITH		INP_FAITH
#define	IN6P_CONTROLOPTS INP_CONTROLOPTS
	/*
	 * socket AF version is {newer than,or include}
	 * actual datagram AF version
	 */

#define	INPLOOKUP_WILDCARD	1
#define	sotoinpcb(so)	((struct inpcb *)(so)->so_pcb)
#define	sotoin6pcb(so)	sotoinpcb(so) /* for KAME src sync over BSD*'s */

#define	INP_SOCKAF(so) so->so_proto->pr_domain->dom_family

#define	INP_CHECK_SOCKAF(so, af) 	(INP_SOCKAF(so) == af)

#ifdef KERNEL
extern int	ipport_lowfirstauto;
extern int	ipport_lowlastauto;
extern int	ipport_firstauto;
extern int	ipport_lastauto;
extern int	ipport_hifirstauto;
extern int	ipport_hilastauto;

void	in_losing __P((struct inpcb *));
int	in_pcballoc __P((struct socket *, struct inpcbinfo *, struct proc *));
int	in_pcbbind __P((struct inpcb *, struct sockaddr *, struct proc *));
int	in_pcbconnect __P((struct inpcb *, struct sockaddr *, struct proc *));
void	in_pcbdetach __P((struct inpcb *));
void	in_pcbdisconnect __P((struct inpcb *));
int	in_pcbinshash __P((struct inpcb *));
int	in_pcbladdr __P((struct inpcb *, struct sockaddr *,
	    struct sockaddr_in **));
struct inpcb *
	in_pcblookup_local __P((struct inpcbinfo *,
	    struct in_addr, u_int, int));
struct inpcb *
	in_pcblookup_hash __P((struct inpcbinfo *,
	    struct in_addr, u_int, struct in_addr, u_int, int));
void	in_pcbnotify __P((struct inpcbhead *, struct sockaddr *,
	    u_int, struct in_addr, u_int, int, void (*)(struct inpcb *, int)));
void	in_pcbrehash __P((struct inpcb *));
int	in_setpeeraddr __P((struct socket *so, struct sockaddr **nam));
int	in_setsockaddr __P((struct socket *so, struct sockaddr **nam));
void	in_pcbremlists __P((struct inpcb *inp));
int	prison_xinpcb __P((struct proc *p, struct inpcb *inp));
#endif /* KERNEL */

#endif /* !_NETINET_IN_PCB_H_ */