/*
 * Copyright (c) 2000-2024 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * 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: src/sys/netinet/in_pcb.h,v 1.32.2.4 2001/08/13 16:26:17 ume Exp $
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2007 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */

#ifndef _NETINET_IN_PCB_H_
#define _NETINET_IN_PCB_H_
#include <sys/appleapiopts.h>

#include <netinet/in.h>
#include <sys/socketvar.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <TargetConditionals.h>

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

#if NECP
#include <net/necp.h>
#endif

#if SKYWALK
#include <skywalk/namespace/netns.h>
#endif /* SKYWALK */

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 utilizing
 * the following structure.
 */
struct in_addr_4in6 {
	u_int32_t       ia46_pad32[3];
	struct  in_addr ia46_addr4;
};


/*
 * Interface exported to userland by various protocols which use
 * inpcbs.  Hack alert -- only define if struct xsocket is in scope.
 */
#pragma pack(4)

#if defined(__LP64__)
struct _inpcb_list_entry {
	u_int32_t   le_next;
	u_int32_t   le_prev;
};
#define _INPCB_PTR(x)           u_int32_t
#define _INPCB_LIST_ENTRY(x)    struct _inpcb_list_entry
#else /* !__LP64__ */
#define _INPCB_PTR(x)           x
#define _INPCB_LIST_ENTRY(x)    LIST_ENTRY(x)
#endif /* !__LP64__ */

struct inpcbinfo;
struct inpcbport;
struct mbuf;
struct ip6_pktopts;
struct ip6_moptions;
struct icmp6_filter;
struct inpcbpolicy;

struct inpcb {
	_INPCB_LIST_ENTRY(inpcb) inp_hash;      /* hash list */
	struct in_addr reserved1;               /* reserved */
	struct in_addr reserved2;               /* reserved */
	u_short inp_fport;                      /* foreign port */
	u_short inp_lport;                      /* local port */
	_INPCB_LIST_ENTRY(inpcb) inp_list;      /* list for all peer PCBs */
	_INPCB_PTR(caddr_t) inp_ppcb;           /* per-protocol pcb */
	_INPCB_PTR(struct inpcbinfo *) inp_pcbinfo;     /* PCB list info */
	_INPCB_PTR(void *) inp_socket;  /* back pointer to socket */
	u_char nat_owner;               /* Used to NAT TCP/UDP traffic */
	u_int32_t nat_cookie;           /* Cookie stored and returned to NAT */
	_INPCB_LIST_ENTRY(inpcb) inp_portlist;  /* this PCB's local port list */
	_INPCB_PTR(struct inpcbport *) inp_phd; /* head of this list */
	inp_gen_t inp_gencnt;           /* generation count of this instance */
	int inp_flags;                  /* generic IP/datagram flags */
	u_int32_t inp_flow;

	u_char inp_vflag;

	u_char inp_ip_ttl;              /* time to live proto */
	u_char inp_ip_p;                /* protocol proto */
	/* protocol dependent part */
	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;
	union {
		/* placeholder for routing entry */
		u_char inp4_route[20];
		u_char inp6_route[32];
	} inp_dependroute;
	struct {
		/* type of service proto */
		u_char inp4_ip_tos;
		/* IP options */
		_INPCB_PTR(struct mbuf *) inp4_options;
		/* IP multicast options */
		_INPCB_PTR(struct ip_moptions *) inp4_moptions;
	} inp_depend4;

	struct {
		/* IP options */
		_INPCB_PTR(struct mbuf *) inp6_options;
		u_int8_t inp6_hlim;
		u_int8_t unused_uint8_1;
		ushort unused_uint16_1;
		/* IP6 options for outgoing packets */
		_INPCB_PTR(struct ip6_pktopts *) inp6_outputopts;
		/* IP multicast options */
		_INPCB_PTR(struct ip6_moptions *) inp6_moptions;
		/* ICMPv6 code type filter */
		_INPCB_PTR(struct icmp6_filter *) inp6_icmp6filt;
		/* IPV6_CHECKSUM setsockopt */
		int     inp6_cksum;
		u_short inp6_ifindex;
		short   inp6_hops;
	} inp_depend6;

	int hash_element;               /* Array index of pcb's hash list */
	_INPCB_PTR(caddr_t) inp_saved_ppcb; /* pointer while cached */
	_INPCB_PTR(struct inpcbpolicy *) inp_sp;
	u_int32_t       reserved[3];    /* reserved */
};

struct  xinpcb {
	u_int32_t       xi_len;         /* length of this structure */
	struct  inpcb xi_inp;
	struct  xsocket xi_socket;
	u_quad_t        xi_alignment_hack;
};

#if XNU_TARGET_OS_OSX || KERNEL || !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
struct inpcb64_list_entry {
	u_int64_t   le_next;
	u_int64_t   le_prev;
};

struct  xinpcb64 {
	u_int64_t       xi_len;         /* length of this structure */
	u_int64_t       xi_inpp;
	u_short         inp_fport;      /* foreign port */
	u_short         inp_lport;      /* local port */
	struct inpcb64_list_entry inp_list; /* list for all PCBs */
	u_int64_t       inp_ppcb;       /* ptr to per-protocol PCB */
	u_int64_t       inp_pcbinfo;    /* PCB list info */
	struct inpcb64_list_entry inp_portlist; /* this PCB's local port list */
	u_int64_t       inp_phd;        /* head of this list */
	inp_gen_t       inp_gencnt;     /* current generation count */
	int             inp_flags;      /* generic IP/datagram flags */
	u_int32_t       inp_flow;
	u_char          inp_vflag;
	u_char          inp_ip_ttl;     /* time to live */
	u_char          inp_ip_p;       /* protocol */
	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;
	struct {
		u_char  inp4_ip_tos;    /* type of service */
	} inp_depend4;
	struct {
		u_int8_t inp6_hlim;
		int     inp6_cksum;
		u_short inp6_ifindex;
		short   inp6_hops;
	} inp_depend6;
	struct  xsocket64 xi_socket;
	u_quad_t        xi_alignment_hack;
};
#endif /* XNU_TARGET_OS_OSX || KERNEL || !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) */


struct  xinpgen {
	u_int32_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;      /* current socket generation count */
};

#pragma pack()

/*
 * These defines are for use with the inpcb.
 */
#define INP_IPV4        0x1
#define INP_IPV6        0x2
#define INP_V4MAPPEDV6  0x4
#define inp_faddr       inp_dependfaddr.inp46_foreign.ia46_addr4
#define inp_laddr       inp_dependladdr.inp46_local.ia46_addr4
#define in6p_faddr      inp_dependfaddr.inp6_foreign
#define in6p_laddr      inp_dependladdr.inp6_local


/*
 * Flags for inp_flags.
 *
 * Some of these are publicly defined for legacy reasons, as they are
 * (unfortunately) used by certain applications to determine, at compile
 * time, whether or not the OS supports certain features.
 */

#define INP_ANONPORT            0x00000040 /* port chosen for user */


#define IN6P_IPV6_V6ONLY        0x00008000 /* restrict AF_INET6 socket for v6 */


#define IN6P_BINDV6ONLY         0x01000000 /* do not grab IPv4 traffic */

#endif /* !_NETINET_IN_PCB_H_ */
