This is xnu-8019. See this file in:
/*
 * Copyright (c) 2000-2020 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) 1998, 1999 Apple Computer, Inc. All Rights Reserved */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * 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.
 *
 *	@(#)socketvar.h	8.3 (Berkeley) 2/19/95
 * $FreeBSD: src/sys/sys/socketvar.h,v 1.46.2.6 2001/08/31 13:45:49 jlemon Exp $
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2005 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 _SYS_SOCKETVAR_H_
#define _SYS_SOCKETVAR_H_

#include <sys/appleapiopts.h>
#include <sys/cdefs.h>
#include <sys/types.h> /* u_quad_t */
#ifdef KERNEL_PRIVATE
#include <sys/queue.h>                  /* for TAILQ macros */
#include <sys/select.h>                 /* for struct selinfo */
#include <net/kext_net.h>
#include <sys/ev.h>
#include <uuid/uuid.h>
#ifdef BSD_KERNEL_PRIVATE
#include <sys/eventhandler.h>
#endif /* BSD_KERNEL_PRIVATE */
#endif /* KERNEL_PRIVATE */
#if !KERNEL
#include <TargetConditionals.h>
#include <uuid/uuid.h>
#endif

typedef u_quad_t so_gen_t;

#ifdef KERNEL_PRIVATE
struct mbuf;
struct socket_filter_entry;
struct protosw;
struct sockif;
struct sockutil;

/* strings for sleep message: */
extern  char netio[], netcon[], netcls[];
#define SOCKET_CACHE_ON
#define SO_CACHE_FLUSH_INTERVAL 1       /* Seconds */
#define SO_CACHE_TIME_LIMIT     (120/SO_CACHE_FLUSH_INTERVAL) /* Seconds */
#define SO_CACHE_MAX_FREE_BATCH 50
#define MAX_CACHED_SOCKETS      512
#define TEMPDEBUG               0
#endif /* KERNEL_PRIVATE */

#ifdef PRIVATE
#define SO_TC_STATS_MAX 4

struct data_stats {
	u_int64_t       rxpackets;
	u_int64_t       rxbytes;
	u_int64_t       txpackets;
	u_int64_t       txbytes;
};
#endif /* PRIVATE */

#ifdef KERNEL_PRIVATE
/*
 * Kernel structure per socket.
 * Contains send and receive buffer queues,
 * handle on protocol and pointer to protocol
 * private data and error information.
 */
struct socket {
	int     so_zone;                /* zone we were allocated from */
	short   so_type;                /* generic type, see socket.h */
	u_short so_error;               /* error affecting connection */
	u_int32_t so_options;           /* from socket call, see socket.h */
	short   so_linger;              /* time to linger while closing */
	short   so_state;               /* internal state flags SS_*, below */
	void    *so_pcb;                /* protocol control block */
	struct  protosw *so_proto;      /* protocol handle */
	/*
	 * Variables for connection queueing.
	 * Socket where accepts occur is so_head in all subsidiary sockets.
	 * If so_head is 0, socket is not related to an accept.
	 * For head socket so_incomp queues partially completed connections,
	 * while so_comp is a queue of connections ready to be accepted.
	 * If a connection is aborted and it has so_head set, then
	 * it has to be pulled out of either so_incomp or so_comp.
	 * We allow connections to queue up based on current queue lengths
	 * and limit on number of queued connections for this socket.
	 */
	struct  socket *so_head;        /* back pointer to accept socket */
	TAILQ_HEAD(, socket) so_incomp; /* q of partially unaccepted conns */
	TAILQ_HEAD(, socket) so_comp;   /* q of complete unaccepted conns */
	TAILQ_ENTRY(socket) so_list;    /* list of unaccepted connections */
	short   so_qlen;                /* number of unaccepted connections */
	short   so_incqlen;             /* number of unaccepted incomplete
	                                 *  connections */
	short   so_qlimit;              /* max number queued connections */
	short   so_timeo;               /* connection timeout */
	pid_t   so_pgid;                /* pgid for signals */
	u_int32_t so_oobmark;           /* chars to oob mark */
	/*
	 * Variables for socket buffering.
	 */
	struct sockbuf {
		u_int32_t       sb_cc;          /* actual chars in buffer */
		u_int32_t       sb_hiwat;       /* max actual char count */
		u_int32_t       sb_mbcnt;       /* chars of mbufs used */
		u_int32_t       sb_mbmax;       /* max chars of mbufs to use */
		u_int32_t       sb_ctl;         /* non-data chars in buffer */
		u_int32_t       sb_lowat;       /* low water mark */
		struct mbuf     *sb_mb;         /* the mbuf chain */
		struct mbuf     *sb_mbtail;     /* the last mbuf in the chain */
		struct mbuf     *sb_lastrecord; /* first mbuf of last record */
		struct socket   *sb_so;         /* socket back ptr for kexts */
		struct selinfo  sb_sel;         /* process selecting rd/wr */
		struct timeval  sb_timeo;       /* timeout for read/write */
		u_int32_t       sb_flags;       /* flags, see below */
		u_int32_t       sb_idealsize;   /* Ideal size for the sb based
		                                 *  on bandwidth and delay */
		void    (*sb_upcall)(struct socket *, void *arg, int waitf);
		void    *sb_upcallarg;          /* Arg for above */
		u_int32_t       sb_wantlock;    /* # of SB_LOCK waiters */
		u_int32_t       sb_waiters;     /* # of data/space waiters */
		thread_t        sb_cfil_thread; /* content filter thread */
		u_int32_t       sb_cfil_refs;   /* # of nested calls */
		u_int32_t       sb_preconn_hiwat; /* preconnect hiwat mark */
	} so_rcv, so_snd;
#define SB_MAX          (8192*1024)     /* default for max chars in sockbuf */
#define LOW_SB_MAX      (2*9*1024)      /* lower limit on max socket buffer
	                                 *  size, 2 max datagrams */
#define SB_LOCK         0x1             /* lock on data queue */
#define SB_NOINTR       0x2             /* operations not interruptible */
#define SB_RECV         0x4             /* this is rcv sb */
#define SB_SEL          0x8             /* someone is selecting */
#define SB_ASYNC        0x10            /* ASYNC I/O, need signals */
#define SB_UPCALL       0x20            /* someone wants an upcall */
#define SB_KNOTE        0x40            /* kernel note attached */
#define SB_DROP         0x80            /* does not accept any more data */
#define SB_UNIX         0x100           /* UNIX domain socket buffer */
#define SB_USRSIZE      0x200           /* user specified sbreserve */
#define SB_AUTOSIZE     0x400           /* automatically size socket buffer */
#define SB_TRIM         0x800           /* Trim the socket buffer */
#define SB_NOCOMPRESS   0x1000          /* do not compress socket buffer */
#define SB_SNDBYTE_CNT  0x2000          /* keep track of snd bytes per interface */
#define SB_UPCALL_LOCK  0x4000          /* Keep socket locked when doing the upcall */
#define SB_LIMITED      0x8000          /* Socket buffer size limited */
	/* XXX Note that Unix domain socket's sb_flags is defined as short */
	caddr_t so_tpcb;                /* Misc. protocol control block, used
	                                 *  by some kexts */

	void            (*so_event)(struct socket *, void *, long);
	void            *so_eventarg;   /* Arg for above */
	kauth_cred_t    so_cred;        /* cred of who opened the socket */
	/* NB: generation count must not be first; easiest to make it last. */
	so_gen_t so_gencnt;             /* generation count */
	STAILQ_ENTRY(socket) so_cache_ent;      /* socache entry */
	caddr_t         so_saved_pcb;           /* Saved pcb when cacheing */
	u_int64_t       cache_timestamp;        /* time socket was cached */

	pid_t           last_pid;       /* pid of most recent accessor */
	u_int64_t       last_upid;      /* upid of most recent accessor */

	struct socket_filter_entry *so_filt;    /* NKE hook */
	u_int32_t       so_flags;               /* Flags */
#define SOF_NOSIGPIPE           0x00000001
#define SOF_NOADDRAVAIL         0x00000002 /* EADDRNOTAVAIL if src addr is gone */
#define SOF_PCBCLEARING         0x00000004 /* pru_disconnect done; don't
	                                    *    call pru_detach */
#define SOF_DEFUNCT             0x00000008 /* socket marked as inactive */
#define SOF_CLOSEWAIT           0x00000010 /* blocked in close awaiting some events */
#define SOF_REUSESHAREUID       0x00000040 /* Allows SO_REUSEADDR/SO_REUSEPORT
	                                    *    for multiple so_uid */
#define SOF_MULTIPAGES          0x00000080 /* jumbo clusters may be used for sosend */
#define SOF_ABORTED             0x00000100 /* soabort was already called once */
#define SOF_OVERFLOW            0x00000200 /* socket was dropped as overflow of
	                                    *    listen q */
#define SOF_NOTIFYCONFLICT      0x00000400 /* notify that a bind was done on a
	                                    *    port already in use */
#define SOF_UPCALLCLOSEWAIT     0x00000800 /* block close until upcall returns */
#define SOF_BINDRANDOMPORT      0x00001000 /* Randomized port number for bind */
#define SOF_NPX_SETOPTSHUT      0x00002000 /* Non POSIX extension to allow
	                                    *    setsockopt(2) after shut down */
#define SOF_RECV_TRAFFIC_CLASS  0x00004000 /* Receive TC as ancillary data */
#define SOF_NODEFUNCT           0x00008000 /* socket cannot be defunct'd */
#define SOF_PRIVILEGED_TRAFFIC_CLASS 0x00010000 /* traffic class is privileged */
#define SOF_SUSPENDED           0x00020000 /* i/f output queue is suspended */
#define SOF_INCOMP_INPROGRESS   0x00040000 /* incomp socket is being processed */
#define SOF_NOTSENT_LOWAT       0x00080000 /* A different lowat on not sent
	                                    *    data has been set */
#define SOF_KNOTE               0x00100000 /* socket is on the EV_SOCK klist */
#define SOF_MARK_WAKE_PKT       0x00200000 /* Mark next packet as wake packet, one shot */
#define SOF_RECV_WAKE_PKT       0x00400000 /* Receive wake packet indication as ancillary data */
#define SOF_FLOW_DIVERT         0x00800000 /* Flow Divert is enabled */
#define SOF_MP_SUBFLOW          0x01000000 /* is a multipath subflow socket */
#define SOF_MP_SEC_SUBFLOW      0x04000000 /* Set up secondary flow */
#define SOF_MP_TRYFAILOVER      0x08000000 /* Failing subflow */
#define SOF_DELEGATED           0x10000000 /* on behalf of another process */
#define SOF_CONTENT_FILTER      0x20000000 /* Content filter enabled */

	uint32_t        so_upcallusecount; /* number of upcalls in progress */
	int             so_usecount;    /* refcounting of socket use */
	int             so_retaincnt;
	uint32_t        so_filteruse;   /* usecount for the socket filters */
	uint16_t        so_traffic_class;
	int8_t          so_netsvctype;
	uint8_t         so_restrictions;
	thread_t        so_send_filt_thread;

	/* for debug pruposes */
#define SO_LCKDBG_MAX 4 /* number of debug locking Link Registers recorded */
	void    *lock_lr[SO_LCKDBG_MAX];        /* locking calling history */
	void    *unlock_lr[SO_LCKDBG_MAX];      /* unlocking caller history */
	u_int8_t        next_lock_lr;
	u_int8_t        next_unlock_lr;

	u_int16_t       so_pktheadroom; /* headroom before packet payload */

	u_int32_t       so_ifdenied_notifies; /* # of notifications generated */

	thread_t        so_background_thread;   /* thread that marked
	                                         *  this socket background */
	struct data_stats so_tc_stats[SO_TC_STATS_MAX];
	struct klist    so_klist;               /* klist for EV_SOCK events */

	struct flow_divert_pcb  *so_fd_pcb;     /* Flow Divert control block */

#if CONTENT_FILTER
	struct cfil_info    *so_cfil;
	u_int32_t           so_state_change_cnt; /* incr for each connect, disconnect */
#endif
	struct soflow_db    *so_flow_db;

	u_int32_t       so_eventmask;           /* event mask */

	pid_t           e_pid;          /* pid of the effective owner */
	u_int64_t       e_upid;         /* upid of the effective owner */
#if XNU_TARGET_OS_OSX
	pid_t           so_rpid;        /* pid of the responsible process */
#endif /* XNU_TARGET_OS_OSX */

	uuid_t          last_uuid;      /* uuid of most recent accessor */
	uuid_t          e_uuid;         /* uuid of effective owner */
	uuid_t          so_vuuid;       /* UUID of the Voucher originator */
#if XNU_TARGET_OS_OSX
	uuid_t          so_ruuid;       /* UUID of the responsible process */
#endif /* XNU_TARGET_OS_OSX */

	int32_t         so_policy_gencnt; /* UUID policy gencnt */

	u_int32_t       so_flags1;
#define SOF1_POST_FALLBACK_SYNC         0x00000001 /* fallback to TCP */
#define SOF1_AWDL_PRIVILEGED            0x00000002 /* unused */
#define SOF1_IF_2KCL                    0x00000004 /* interface prefers 2 KB clusters */
#define SOF1_DEFUNCTINPROG              0x00000008
#define SOF1_DATA_IDEMPOTENT            0x00000010 /* idempotent data for TFO */
#define SOF1_PRECONNECT_DATA            0x00000020 /* request for preconnect data */
#define SOF1_EXTEND_BK_IDLE_WANTED      0x00000040 /* option set */
#define SOF1_EXTEND_BK_IDLE_INPROG      0x00000080 /* socket */
#define SOF1_CACHED_IN_SOCK_LAYER       0x00000100 /* bundled with inpcb and  tcpcb */
#define SOF1_TFO_REWIND                 0x00000200 /* rewind mptcp meta data */
#define SOF1_CELLFALLBACK               0x00000400 /* Initiated by cell fallback */
#define SOF1_QOSMARKING_ALLOWED         0x00000800 /* policy allows DSCP map */
#define SOF1_TC_NET_SERV_TYPE           0x00001000 /* traffic class set by SO_NETWORK_SERVICE_TYPE */
#define SOF1_TRAFFIC_MGT_SO_BACKGROUND  0x00002000 /* background socket */
#define SOF1_TRAFFIC_MGT_TCP_RECVBG     0x00004000 /* Only TCP sockets, receiver throttling */
#define SOF1_QOSMARKING_POLICY_OVERRIDE 0x00008000 /* Opt-out of QoS marking NECP policy */
#define SOF1_DATA_AUTHENTICATED         0x00010000 /* idempotent data is authenticated */
#define SOF1_ACCEPT_LIST_HELD           0x00020000 /* Another thread is accessing one of the accept lists */
#define SOF1_CONTENT_FILTER_SKIP        0x00040000 /* Content filter should be skipped, socket is blessed */
#define SOF1_HAS_NECP_CLIENT_UUID       0x00080000 /* NECP client UUID option set */
#define SOF1_IN_KERNEL_SOCKET           0x00100000 /* Socket created in kernel via KPI */
#define SOF1_CONNECT_COUNTED            0x00200000 /* connect() call was counted */
#define SOF1_DNS_COUNTED                0x00400000 /* socket counted to send DNS queries */
#define SOF1_MPKL_SEND_INFO             0x00800000 /* SO_MPKL_SEND_INFO option is set */
#define SOF1_INBOUND                    0x01000000 /* Created via a passive listener */
#define SOF1_WANT_KEV_SOCK_CLOSED       0x02000000 /* Want generation of KEV_SOCKET_CLOSED event */
#define SOF1_FLOW_DIVERT_SKIP           0x04000000 /* Flow divert already declined to handle the socket */
#define SOF1_KNOWN_TRACKER              0x08000000 /* Socket is a connection to a known tracker */
#define SOF1_TRACKER_NON_APP_INITIATED  0x10000000 /* Tracker connection is non-app initiated */
#define SOF1_APPROVED_APP_DOMAIN            0x20000000 /* Connection is for an approved associated app domain */

	u_int64_t       so_extended_bk_start;

	u_int8_t        so_fallback_mode;
#define SO_FALLBACK_MODE_NONE             0 /* No fallback */
#define SO_FALLBACK_MODE_FAILOVER         1 /* Fell back after failing over */
#define SO_FALLBACK_MODE_SLOW             2 /* Fell back after a slow timer */
#define SO_FALLBACK_MODE_FAST             3 /* Fell back after a fast timer */
#define SO_FALLBACK_MODE_PREFER           4 /* Fell back with a headstart */

	u_int8_t        so_log_seqn;    /* Multi-layer Packet Logging rolling sequence number */
	uuid_t          so_mpkl_send_uuid;
	uint8_t         so_mpkl_send_proto;
};

/* Control message accessor in mbufs */

#define _MIN_NXT_CMSGHDR_PTR(cmsg)                                      \
	((char *)(cmsg) +                                               \
	    __DARWIN_ALIGN32((__uint32_t)(cmsg)->cmsg_len) +            \
	    __DARWIN_ALIGN32(sizeof(struct cmsghdr)))

#define M_FIRST_CMSGHDR(m)                                              \
	((char *)(m) != (char *)0L &&                                   \
	(size_t)(m)->m_len >= sizeof (struct cmsghdr) &&                \
	(socklen_t)(m)->m_len >=                                        \
	__DARWIN_ALIGN32(((struct cmsghdr *)(void *)(m)->m_data)->cmsg_len) ? \
	(struct cmsghdr *)(void *)(m)->m_data :	(struct cmsghdr *)0L)

#define M_NXT_CMSGHDR(m, cmsg)                                          \
	((char *)(cmsg) == (char *)0L ? M_FIRST_CMSGHDR(m) :            \
	_MIN_NXT_CMSGHDR_PTR(cmsg) > ((char *)(m)->m_data) + (m)->m_len ||  \
	_MIN_NXT_CMSGHDR_PTR(cmsg) < (char *)(m)->m_data ?              \
	(struct cmsghdr *)0L /* NULL */ :                               \
	(struct cmsghdr *)(void *)((unsigned char *)(cmsg) +            \
	__DARWIN_ALIGN32((__uint32_t)(cmsg)->cmsg_len)))

/*
 * Socket state bits.
 */
#define SS_NOFDREF              0x0001  /* no file table ref any more */
#define SS_ISCONNECTED          0x0002  /* socket connected to a peer */
#define SS_ISCONNECTING         0x0004  /* in process of connecting to peer */
#define SS_ISDISCONNECTING      0x0008  /* in process of disconnecting */
#define SS_CANTSENDMORE         0x0010  /* can't send more data to peer */
#define SS_CANTRCVMORE          0x0020  /* can't receive more data from peer */
#define SS_RCVATMARK            0x0040  /* at mark on input */

#define SS_PRIV                 0x0080  /* privileged for broadcast, raw... */
#define SS_NBIO                 0x0100  /* non-blocking ops */
#define SS_ASYNC                0x0200  /* async i/o notify */
#define SS_ISCONFIRMING         0x0400  /* deciding to accept connection req */
#define SS_INCOMP               0x0800  /* Unaccepted, incomplete connection */
#define SS_COMP                 0x1000  /* unaccepted, complete connection */
#define SS_ISDISCONNECTED       0x2000  /* socket disconnected from peer */
#define SS_DRAINING             0x4000  /* close waiting for blocked system
	                                 *       calls to drain */
#define SS_DEFUNCT              0x8000  /* has been fully defunct'd */
#endif /* KERNEL_PRIVATE */

#if defined(__LP64__)
#define _XSOCKET_PTR(x)         u_int32_t
#else
#define _XSOCKET_PTR(x)         x
#endif

#ifdef PRIVATE
/* Flags returned in data field for EVFILT_SOCK events. */
#define SOCKEV_CONNECTED        0x00000001 /* connected */
#define SOCKEV_DISCONNECTED     0x00000002 /* disconnected */
#endif /* PRIVATE */

#pragma pack(4)

struct xsockbuf {
	u_int32_t       sb_cc;
	u_int32_t       sb_hiwat;
	u_int32_t       sb_mbcnt;
	u_int32_t       sb_mbmax;
	int32_t         sb_lowat;
	short           sb_flags;
	short           sb_timeo;
};

/*
 * Externalized form of struct socket used by the sysctl(3) interface.
 */
struct  xsocket {
	u_int32_t               xso_len;        /* length of this structure */
	_XSOCKET_PTR(struct socket *) xso_so;   /* makes a convenient handle */
	short                   so_type;
	short                   so_options;
	short                   so_linger;
	short                   so_state;
	_XSOCKET_PTR(caddr_t)   so_pcb;         /* another convenient handle */
	int                     xso_protocol;
	int                     xso_family;
	short                   so_qlen;
	short                   so_incqlen;
	short                   so_qlimit;
	short                   so_timeo;
	u_short                 so_error;
	pid_t                   so_pgid;
	u_int32_t               so_oobmark;
	struct xsockbuf         so_rcv;
	struct xsockbuf         so_snd;
	uid_t                   so_uid;         /* XXX */
};

#if XNU_TARGET_OS_OSX || KERNEL || !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
struct  xsocket64 {
	u_int32_t               xso_len;        /* length of this structure */
	u_int64_t               xso_so;         /* makes a convenient handle */
	short                   so_type;
	short                   so_options;
	short                   so_linger;
	short                   so_state;
	u_int64_t               so_pcb;         /* another convenient handle */
	int                     xso_protocol;
	int                     xso_family;
	short                   so_qlen;
	short                   so_incqlen;
	short                   so_qlimit;
	short                   so_timeo;
	u_short                 so_error;
	pid_t                   so_pgid;
	u_int32_t               so_oobmark;
	struct xsockbuf         so_rcv;
	struct xsockbuf         so_snd;
	uid_t                   so_uid;         /* XXX */
};
#endif /* XNU_TARGET_OS_OSX || KERNEL || !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR) */

#ifdef PRIVATE
#define XSO_SOCKET      0x001
#define XSO_RCVBUF      0x002
#define XSO_SNDBUF      0x004
#define XSO_STATS       0x008
#define XSO_INPCB       0x010
#define XSO_TCPCB       0x020
#define XSO_KCREG       0x040
#define XSO_KCB         0x080
#define XSO_EVT         0x100

struct  xsocket_n {
	u_int32_t               xso_len;        /* length of this structure */
	u_int32_t               xso_kind;       /* XSO_SOCKET */
	u_int64_t               xso_so;         /* makes a convenient handle */
	short                   so_type;
	u_int32_t               so_options;
	short                   so_linger;
	short                   so_state;
	u_int64_t               so_pcb;         /* another convenient handle */
	int                     xso_protocol;
	int                     xso_family;
	short                   so_qlen;
	short                   so_incqlen;
	short                   so_qlimit;
	short                   so_timeo;
	u_short                 so_error;
	pid_t                   so_pgid;
	u_int32_t               so_oobmark;
	uid_t                   so_uid;         /* XXX */
	pid_t                   so_last_pid;
	pid_t                   so_e_pid;
};

struct xsockbuf_n {
	u_int32_t               xsb_len;        /* length of this structure */
	u_int32_t               xsb_kind;       /* XSO_RCVBUF or XSO_SNDBUF */
	u_int32_t               sb_cc;
	u_int32_t               sb_hiwat;
	u_int32_t               sb_mbcnt;
	u_int32_t               sb_mbmax;
	int32_t                 sb_lowat;
	short                   sb_flags;
	short                   sb_timeo;
};

struct xsockstat_n {
	u_int32_t               xst_len;        /* length of this structure */
	u_int32_t               xst_kind;       /* XSO_STATS */
	struct data_stats       xst_tc_stats[SO_TC_STATS_MAX];
};

/*
 * Global socket statistics
 */
struct soextbkidlestat {
	u_int32_t       so_xbkidle_maxperproc;
	u_int32_t       so_xbkidle_time;
	u_int32_t       so_xbkidle_rcvhiwat;
	int32_t         so_xbkidle_notsupp;
	int32_t         so_xbkidle_toomany;
	int32_t         so_xbkidle_wantok;
	int32_t         so_xbkidle_active;
	int32_t         so_xbkidle_nocell;
	int32_t         so_xbkidle_notime;
	int32_t         so_xbkidle_forced;
	int32_t         so_xbkidle_resumed;
	int32_t         so_xbkidle_expired;
	int32_t         so_xbkidle_resched;
	int32_t         so_xbkidle_nodlgtd;
	int32_t         so_xbkidle_drained;
};
#endif /* PRIVATE */

#pragma pack()

#ifdef KERNEL_PRIVATE
#include <sys/kpi_mbuf.h>

/*
 * Argument structure for sosetopt et seq.  This is in the KERNEL
 * section because it will never be visible to user code.
 */
enum sopt_dir { SOPT_GET, SOPT_SET };
struct sockopt {
	enum    sopt_dir sopt_dir; /* is this a get or a set? */
	int     sopt_level;     /* second arg of [gs]etsockopt */
	int     sopt_name;      /* third arg of [gs]etsockopt */
	user_addr_t sopt_val;   /* fourth arg of [gs]etsockopt */
	size_t  sopt_valsize;   /* (almost) fifth arg of [gs]etsockopt */
	struct  proc *sopt_p;   /* calling process or null if kernel */
};

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_PCB);
#endif /* MALLOC_DECLARE */

#ifdef BSD_KERNEL_PRIVATE
struct cmsghdr;
extern boolean_t is_cmsg_valid(struct mbuf *control, struct cmsghdr *cmsg);

/*
 * Socket extension mechanism: control block hooks:
 * This is the "head" of any control block for an extenstion
 * Note: we separate intercept function dispatch vectors from
 *  the NFDescriptor to permit selective replacement during
 *  operation, e.g., to disable some functions.
 */
struct kextcb {
	struct kextcb *e_next;          /* Next kext control block */
	void *e_fcb;                    /* Real filter control block */
	struct NFDescriptor *e_nfd;     /* NKE Descriptor */
	/* Plug-in support - intercept functions */
	struct sockif *e_soif;          /* Socket functions */
	struct sockutil *e_sout;        /* Sockbuf utility functions */
};
#define EXT_NULL        0x0             /* STATE: Not in use */

/* Hints for socket event processing */
#define SO_FILT_HINT_LOCKED             0x00000001      /* socket is already locked */
#define SO_FILT_HINT_CONNRESET          0x00000002      /* Reset is received */
#define SO_FILT_HINT_CANTRCVMORE        0x00000004      /* No more data to read */
#define SO_FILT_HINT_CANTSENDMORE       0x00000008      /* Can't write more data */
#define SO_FILT_HINT_TIMEOUT            0x00000010      /* timeout */
#define SO_FILT_HINT_NOSRCADDR          0x00000020      /* No src address available */
#define SO_FILT_HINT_IFDENIED           0x00000040      /* interface denied access */
#define SO_FILT_HINT_SUSPEND            0x00000080      /* output queue suspended */
#define SO_FILT_HINT_RESUME             0x00000100      /* output queue resumed */
#define SO_FILT_HINT_KEEPALIVE          0x00000200      /* TCP Keepalive received */
#define SO_FILT_HINT_ADAPTIVE_WTIMO     0x00000400      /* TCP adaptive write timeout */
#define SO_FILT_HINT_ADAPTIVE_RTIMO     0x00000800      /* TCP adaptive read timeout */
#define SO_FILT_HINT_CONNECTED          0x00001000      /* socket is connected */
#define SO_FILT_HINT_DISCONNECTED       0x00002000      /* socket is disconnected */
#define SO_FILT_HINT_CONNINFO_UPDATED   0x00004000      /* updated conninfo avail. */
#define SO_FILT_HINT_MPFAILOVER         0x00008000      /* multipath failover */
#define SO_FILT_HINT_MPSTATUS           0x00010000      /* multipath status */
#define SO_FILT_HINT_MUSTRST            0x00020000      /* must send RST and close */
#define SO_FILT_HINT_MPCANTRCVMORE      0x00040000      /* MPTCP DFIN Received */
#define SO_FILT_HINT_NOTIFY_ACK         0x00080000      /* Notify Acknowledgement */
#define SO_FILT_HINT_MP_SUB_ERROR       0x00100000      /* Error happend on subflow */

#define SO_FILT_HINT_BITS \
	"\020\1LOCKED\2CONNRESET\3CANTRCVMORE\4CANTSENDMORE\5TIMEOUT"   \
	"\6NOSRCADDR\7IFDENIED\10SUSPEND\11RESUME\12KEEPALIVE\13AWTIMO" \
	"\14ARTIMO\15CONNECTED\16DISCONNECTED\17CONNINFO_UPDATED"       \
	"\20MPFAILOVER\21MPSTATUS\22MUSTRST\23MPCANTRCVMORE\24NOTIFYACK"\
	"\25MPSUBERROR"

/* Mask for hints that have corresponding kqueue events */
#define SO_FILT_HINT_EV                                                 \
	(SO_FILT_HINT_CONNRESET | SO_FILT_HINT_CANTRCVMORE |            \
	SO_FILT_HINT_CANTSENDMORE | SO_FILT_HINT_TIMEOUT |              \
	SO_FILT_HINT_NOSRCADDR | SO_FILT_HINT_IFDENIED |                \
	SO_FILT_HINT_SUSPEND | SO_FILT_HINT_RESUME |                    \
	SO_FILT_HINT_KEEPALIVE | SO_FILT_HINT_ADAPTIVE_WTIMO |          \
	SO_FILT_HINT_ADAPTIVE_RTIMO | SO_FILT_HINT_CONNECTED |          \
	SO_FILT_HINT_DISCONNECTED | SO_FILT_HINT_CONNINFO_UPDATED |     \
	SO_FILT_HINT_NOTIFY_ACK)

#if SENDFILE
struct sf_buf {
	SLIST_ENTRY(sf_buf) free_list;  /* list of free buffer slots */
	int             refcnt;         /* reference count */
	struct          vm_page *m;     /* currently mapped page */
	vm_offset_t     kva;            /* va of mapping */
};
#endif /* SENDFILE */

#define SBLASTRECORDCHK(sb, s)                                          \
	if (socket_debug) sblastrecordchk(sb, s);

#define SBLASTMBUFCHK(sb, s)                                            \
	if (socket_debug) sblastmbufchk(sb, s);

#define SB_EMPTY_FIXUP(sb) {                                            \
	if ((sb)->sb_mb == NULL) {                                      \
	        (sb)->sb_mbtail = NULL;                                 \
	        (sb)->sb_lastrecord = NULL;                             \
	}                                                               \
}

#define SB_MB_CHECK(sb) do {                                            \
	if (((sb)->sb_mb != NULL &&                                     \
	    (sb)->sb_cc == 0) ||                                        \
	    ((sb)->sb_mb == NULL && (sb)->sb_cc > 0))                   \
	        panic("corrupt so_rcv: sb_mb %p sb_cc %d\n",            \
	            (sb)->sb_mb, (sb)->sb_cc);                          \
} while (0)

#define SODEFUNCTLOG(fmt, ...)  do {            \
	if (sodefunctlog)                       \
	        printf(fmt, __VA_ARGS__);       \
} while (0)

#define SOTHROTTLELOG(fmt, ...) do {            \
	if (sothrottlelog)                      \
	        printf(fmt, __VA_ARGS__);       \
} while (0)

/*
 * For debugging traffic class behaviors
 */
#define SOTCDB_RESERVED         0x01
#define SOTCDB_NO_MTC           0x02    /* Do not set the mbuf traffic class */
#define SOTCDB_NO_SENDTCPBG     0x04    /* Do not use background TCP CC algorithm for sender */
#define SOTCDB_NO_LCLTST        0x08    /* Do not test for local destination for setting DSCP */
#define SOTCDB_NO_DSCPTST       0x10    /* Overwritte any existing DSCP code */
#define SOTCDB_NO_RECVTCPBG     0x20    /* Do not use throttling on receiver-side of TCP */
#define SOTCDB_NO_PRIVILEGED    0x40    /* Do not set privileged traffic flag */

#define SOCK_DOM(so)                    ((so)->so_proto->pr_domain->dom_family)
#define SOCK_TYPE(so)                   ((so)->so_proto->pr_type)
#define SOCK_PROTO(so)                  ((so)->so_proto->pr_protocol)

#define SOCK_CHECK_DOM(so, dom)         (SOCK_DOM(so) == (dom))
#define SOCK_CHECK_TYPE(so, type)       (SOCK_TYPE(so) == (type))
#define SOCK_CHECK_PROTO(so, proto)     (SOCK_PROTO(so) == (proto))

/*
 * Socket process information
 */
struct so_procinfo {
	pid_t           spi_pid;
	pid_t           spi_epid;
	uuid_t          spi_uuid;
	uuid_t          spi_euuid;
	int             spi_delegated;
	char            spi_proc_name[MAXCOMLEN + 1];
	char            spi_e_proc_name[MAXCOMLEN + 1];
};

extern u_int32_t sb_max;
extern so_gen_t so_gencnt;
extern int socket_debug;
extern int sosendjcl;
extern int sosendjcl_ignore_capab;
extern int sodefunctlog;
extern int sothrottlelog;
extern int sorestrictrecv;
extern int sorestrictsend;
extern int somaxconn;
extern uint32_t tcp_autosndbuf_max;
extern uint32_t tcp_autosndbuf_inc;
extern u_int32_t sotcdb;
extern u_int32_t net_io_policy_log;
extern u_int32_t net_io_policy_throttle_best_effort;
#if CONFIG_PROC_UUID_POLICY
extern u_int32_t net_io_policy_uuid;
#endif /* CONFIG_PROC_UUID_POLICY */

extern struct soextbkidlestat soextbkidlestat;

#endif /* BSD_KERNEL_PRIVATE */

struct mbuf;
struct sockaddr;
struct ucred;
struct uio;

#define SOCK_MSG_SA 0x01
#define SOCK_MSG_CONTROL 0x02
#define SOCK_MSG_DATA 0x04

struct recv_msg_elem {
	struct uio *uio;
	struct sockaddr *psa;
	struct mbuf *controlp;
	int which;
	int flags;
};

/*
 * From uipc_socket and friends
 */
__BEGIN_DECLS
/* Exported */
extern int sbappendaddr(struct sockbuf *sb, struct sockaddr *asa,
    struct mbuf *m0, struct mbuf *control, int *error_out);
extern int sbappendchain(struct sockbuf *sb, struct mbuf *m, int space);
extern int sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
extern int sbappendrecord_nodrop(struct sockbuf *sb, struct mbuf *m0);
extern void sbflush(struct sockbuf *sb);
extern int sbspace(struct sockbuf *sb);
extern int soabort(struct socket *so);
extern void socantrcvmore(struct socket *so);
extern void socantsendmore(struct socket *so);
extern int sodisconnect(struct socket *so);
extern void sofree(struct socket *so);
extern void sofreelastref(struct socket *, int);
extern void soisconnected(struct socket *so);
extern boolean_t socanwrite(struct socket *so);
extern void soisconnecting(struct socket *so);
extern void soisdisconnected(struct socket *so);
extern void soisdisconnecting(struct socket *so);
extern struct socket *sonewconn(struct socket *head, int connstatus,
    const struct sockaddr *from);
extern int sopoll(struct socket *so, int events, struct ucred *cred, void *wql);
extern int sooptcopyin(struct sockopt *sopt, void *data, size_t len,
    size_t minlen)
__attribute__ ((warn_unused_result));
extern int sooptcopyout(struct sockopt *sopt, void *data, size_t len)
__attribute__ ((warn_unused_result));
extern int soopt_cred_check(struct socket *so, int priv, boolean_t allow_root,
    boolean_t ignore_delegate);
extern int soreceive(struct socket *so, struct sockaddr **paddr,
    struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp);
extern int soreserve(struct socket *so, uint32_t sndcc, uint32_t rcvcc);
extern void soreserve_preconnect(struct socket *so, unsigned int pre_cc);
extern void sorwakeup(struct socket *so);
extern int sosend(struct socket *so, struct sockaddr *addr, struct uio *uio,
    struct mbuf *top, struct mbuf *control, int flags);
extern int sosend_reinject(struct socket *so, struct sockaddr *addr, struct mbuf *top,
    struct mbuf *control, uint32_t sendflags);
extern int sosend_list(struct socket *so, struct uio **uio, u_int uiocnt,
    int flags);
extern int soreceive_list(struct socket *so, struct recv_msg_elem *msgarray,
    u_int msgcnt, int *flags);
extern void sonullevent(struct socket *so, void *arg, long hint);
extern struct mbuf *sbconcat_mbufs(struct sockbuf *sb, struct sockaddr *asa, struct mbuf *m0,
    struct mbuf *control);


__END_DECLS

#ifdef BSD_KERNEL_PRIVATE
struct file;
struct filedesc;
struct so_tcdbg;

__BEGIN_DECLS
/* Not exported */
extern void socketinit(void);
extern struct sockaddr *dup_sockaddr(struct sockaddr *sa, int canwait);
extern int getsock(struct filedesc *fdp, int fd, struct file **fpp);
extern int sockargs(struct mbuf **mp, user_addr_t data, socklen_t buflen, int type);
extern void get_sockev_state(struct socket *, u_int32_t *);
extern void so_update_last_owner_locked(struct socket *, struct proc *);
extern void so_update_policy(struct socket *);
extern void so_acquire_accept_list(struct socket *, struct socket *);
extern void so_release_accept_list(struct socket *);

extern int sbappend(struct sockbuf *sb, struct mbuf *m);
extern int sbappend_nodrop(struct sockbuf *sb, struct mbuf *m);
extern int sbappendstream(struct sockbuf *sb, struct mbuf *m);
extern int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
    struct mbuf *control, int *error_out);
extern int sbappendstream_rcvdemux(struct socket *so, struct mbuf *m);
#if MPTCP
extern int sbappendmptcpstream_rcv(struct sockbuf *sb, struct mbuf *m);
#endif /* MPTCP */
extern void sbcheck(struct sockbuf *sb);
extern void sblastmbufchk(struct sockbuf *, const char *);
extern void sblastrecordchk(struct sockbuf *, const char *);
extern struct mbuf *sbcreatecontrol(caddr_t p, int size, int type, int level);
extern struct mbuf **sbcreatecontrol_mbuf(caddr_t p, int size, int type,
    int level, struct mbuf **m);
extern void sbdrop(struct sockbuf *sb, int len);
extern void sbdroprecord(struct sockbuf *sb);
extern void sbrelease(struct sockbuf *sb);
extern int sbreserve(struct sockbuf *sb, u_int32_t cc);
extern void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
extern int sbwait(struct sockbuf *sb);
extern void sbwakeup(struct sockbuf *sb);
extern void sb_empty_assert(struct sockbuf *, const char *);
extern int sb_notify(struct sockbuf *sb);
extern void sballoc(struct sockbuf *sb, struct mbuf *m);
extern void sbfree(struct sockbuf *sb, struct mbuf *m);
extern void sbfree_chunk(struct sockbuf *sb, struct mbuf *m);

/* Note: zero out the buffer and set sa_len to size */
extern void *alloc_sockaddr(size_t size, zalloc_flags_t flags);

#if XNU_TARGET_OS_OSX
#define free_sockaddr(sa) do {                                  \
	kheap_free_addr(KHEAP_SONAME, (sa));                    \
} while (0)
#else /* XNU_TARGET_OS_OSX */
#define free_sockaddr(sa) do {                                  \
if ((sa) != NULL) {                                             \
	kheap_free_bounded(KHEAP_SONAME, (sa), 1, UINT8_MAX);   \
}                                                               \
} while (0)
#endif /* XNU_TARGET_OS_OSX */

/*
 * Flags to sblock().
 */
#define SBL_WAIT        0x00000001      /* Wait if not immediately available. */
#define SBL_NOINTR      0x00000002      /* Force non-interruptible sleep. */
#define SBL_IGNDEFUNCT  0x00000004      /* Ignore defunct'd state */
#define SBL_VALID       (SBL_WAIT | SBL_NOINTR | SBL_IGNDEFUNCT)
extern int sblock(struct sockbuf *sb, uint32_t flags);
extern void sbunlock(struct sockbuf *sb, boolean_t keeplocked);

extern int soaccept(struct socket *so, struct sockaddr **nam);
extern int soacceptlock(struct socket *so, struct sockaddr **nam, int dolock);
extern int soacceptfilter(struct socket *so, struct socket *head);
extern struct socket *soalloc(int waitok, int dom, int type);
extern int sobindlock(struct socket *so, struct sockaddr *nam, int dolock);
extern int soclose(struct socket *so);
extern int soclose_locked(struct socket *so);
extern void soclose_wait_locked(struct socket *so);
extern int soconnect(struct socket *so, struct sockaddr *nam);
extern int soconnectlock(struct socket *so, struct sockaddr *nam, int dolock);
extern int soconnect2(struct socket *so1, struct socket *so2);
extern int soconnectxlocked(struct socket *so, struct sockaddr *src,
    struct sockaddr *dst, struct proc *, uint32_t, sae_associd_t,
    sae_connid_t *, uint32_t, void *, u_int32_t, uio_t, user_ssize_t *);
extern int sodisconnectx(struct socket *so, sae_associd_t, sae_connid_t);
extern int sodisconnectxlocked(struct socket *so, sae_associd_t, sae_connid_t);
extern void soevupcall(struct socket *so, long hint);
/* flags for socreate_internal */
#define SOCF_MPTCP      0x1     /* MPTCP-subflow */
extern int socreate_internal(int dom, struct socket **aso, int type, int proto,
    struct proc *, uint32_t, struct proc *);
extern int socreate(int dom, struct socket **aso, int type, int proto);
extern int socreate_delegate(int dom, struct socket **aso, int type, int proto,
    pid_t epid);
extern void sodealloc(struct socket *so);
extern int sodisconnectlocked(struct socket *so);
extern void soreference(struct socket *so);
extern void sodereference(struct socket *so);
extern void somultipages(struct socket *, boolean_t);
extern void soif2kcl(struct socket *, boolean_t);
extern int sosetdefunct(struct proc *, struct socket *, int level, boolean_t);
extern int sodefunct(struct proc *, struct socket *, int level);
extern int soresume(struct proc *, struct socket *, int);
extern void resume_proc_sockets(proc_t);
extern int so_check_extended_bk_idle_time(struct socket *);
extern void so_drain_extended_bk_idle(struct socket *);
extern void sohasoutofband(struct socket *so);
extern void sodisconnectwakeup(struct socket *so);
extern int soisthrottled(struct socket *so);
extern int soisprivilegedtraffic(struct socket *so);
extern int soissrcbackground(struct socket *so);
extern int soissrcrealtime(struct socket *so);
extern int soissrcbesteffort(struct socket *so);
extern void soclearfastopen(struct socket *so);
extern int solisten(struct socket *so, int backlog);
extern struct socket *sodropablereq(struct socket *head);
extern lck_mtx_t *socket_getlock(struct socket *so, int flags);
extern void socket_lock(struct socket *so, int refcount);
extern void socket_lock_assert_owned(struct socket *so);
extern int socket_try_lock(struct socket *so);
extern void socket_unlock(struct socket *so, int refcount);
extern int sogetaddr_locked(struct socket *, struct sockaddr **, int);
extern const char *solockhistory_nr(struct socket *);
extern void soevent(struct socket *so, long hint);
extern void sorflush(struct socket *so);
extern void sowflush(struct socket *so);
extern void sowakeup(struct socket *so, struct sockbuf *sb, struct socket *so2);
extern int soioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p);
extern int sogetoptlock(struct socket *so, struct sockopt *sopt, int);
extern int sosetoptlock(struct socket *so, struct sockopt *sopt, int);
extern int soshutdown(struct socket *so, int how);
extern int soshutdownlock(struct socket *so, int how);
extern int soshutdownlock_final(struct socket *so, int how);
extern void sotoxsocket(struct socket *so, struct xsocket *xso);
#if XNU_TARGET_OS_OSX
extern void sotoxsocket64(struct socket *so, struct xsocket64 *xso);
#endif /* XNU_TARGET_OS_OSX */
extern int sosendallatonce(struct socket *so);
extern int soreadable(struct socket *so);
extern int sowriteable(struct socket *so);
extern void sowwakeup(struct socket *so);
extern int sosendcheck(struct socket *, struct sockaddr *, user_ssize_t,
    int32_t, int32_t, int, int *);

extern int soo_ioctl(struct fileproc *, u_long, caddr_t, vfs_context_t);
extern int soo_stat(struct socket *, void *, int);
extern int soo_select(struct fileproc *, int, void *, vfs_context_t);
extern int soo_kqfilter(struct fileproc *, struct knote *, struct kevent_qos_s *);

#define TRACKER_DOMAIN_MAX              253
#define TRACKER_DOMAIN_SHORT_MAX        63

typedef struct tracker_metadata {
	uint32_t flags;
	char domain[TRACKER_DOMAIN_MAX + 1];
	char domain_owner[TRACKER_DOMAIN_MAX + 1];
} tracker_metadata_t;

typedef struct tracker_metadata_short {
	uint32_t flags;
	char domain[TRACKER_DOMAIN_SHORT_MAX + 1];
	char domain_owner[TRACKER_DOMAIN_SHORT_MAX + 1];
} tracker_metadata_short_t;

extern int tracker_lookup(uuid_t app_uuid, struct sockaddr *, tracker_metadata_t *metadata);

/*
 * Socket flow management
 */

#define IS_INET(so) (so != NULL && so->so_proto != NULL && so->so_proto->pr_domain != NULL && (so->so_proto->pr_domain->dom_family == AF_INET || so->so_proto->pr_domain->dom_family == AF_INET6))
#define IS_TCP(so) (so != NULL && so->so_proto != NULL && so->so_proto->pr_type == SOCK_STREAM && so->so_proto->pr_protocol == IPPROTO_TCP)
#define IS_UDP(so) (so != NULL && so->so_proto != NULL && so->so_proto->pr_type == SOCK_DGRAM && so->so_proto->pr_protocol == IPPROTO_UDP)

// For iOS, keep track of flows for UDP sockets only.
// For OSX, keep track of flows for all datagram sockets.
#if !XNU_TARGET_OS_OSX
#define NEED_DGRAM_FLOW_TRACKING(so) (IS_INET(so) && IS_UDP(so))
#else
#define NEED_DGRAM_FLOW_TRACKING(so) (IS_INET(so) && !IS_TCP(so))
#endif

// Check if socket flow tracking is present for socket
#define SOFLOW_ENABLED(so) (so != NULL && (so->so_flow_db != NULL))

extern struct soflow_hash_entry *soflow_get_flow(struct socket *, struct sockaddr *, struct sockaddr *, struct mbuf *, size_t, bool, u_short);
extern void soflow_free_flow(struct soflow_hash_entry *);
extern void soflow_detach(struct socket *);

/* Service class flags used for setting service class on a packet */
#define PKT_SCF_IPV6            0x00000001      /* IPv6 packet */
#define PKT_SCF_TCP_ACK         0x00000002      /* Pure TCP ACK */
#define PKT_SCF_TCP_SYN         0x00000004      /* TCP SYN */

/*
 * Flags for connectx(2) user-protocol request routine.
 */

#define CONNREQF_MPTCP  0x1     /* called internally by MPTCP */
#define CONNREQF_UIO    0x2     /* there's data */
#define CONNREQF_IDEM   0x4     /* data is idempotent */

extern void set_packet_service_class(struct mbuf *, struct socket *,
    mbuf_svc_class_t, u_int32_t);
extern void so_tc_update_stats(struct mbuf *, struct socket *,
    mbuf_svc_class_t);
extern int so_tos_from_control(struct mbuf *);
extern int so_tc_from_control(struct mbuf *, int *);
extern mbuf_svc_class_t so_tc2msc(int);
extern int so_svc2tc(mbuf_svc_class_t);

extern u_int8_t tcp_cansbgrow(struct sockbuf *sb);
extern void set_tcp_stream_priority(struct socket *so);

extern int so_set_net_service_type(struct socket *, int);
extern int so_set_traffic_class(struct socket *, int);
extern void so_set_default_traffic_class(struct socket *);
extern int so_set_opportunistic(struct socket *, int);
extern int so_get_opportunistic(struct socket *);
extern int so_set_recv_anyif(struct socket *, int);
extern int so_get_recv_anyif(struct socket *);
extern int so_set_effective_pid(struct socket *so, int epid, struct proc *p, boolean_t check_cred);
extern int so_set_effective_uuid(struct socket *so, uuid_t euuid, struct proc *p, boolean_t check_cred);
extern int so_set_restrictions(struct socket *, uint32_t);
extern uint32_t so_get_restrictions(struct socket *);
#if (DEVELOPMENT || DEBUG)
extern int so_set_tcdbg(struct socket *, struct so_tcdbg *);
extern int sogetopt_tcdbg(struct socket *, struct sockopt *);
#endif /* (DEVELOPMENT || DEBUG) */

extern int so_isdstlocal(struct socket *);
extern void so_recv_data_stat(struct socket *, struct mbuf *, size_t);
extern void so_inc_recv_data_stat(struct socket *, size_t, size_t, uint32_t);
extern int so_wait_for_if_feedback(struct socket *);
extern int soopt_getm(struct sockopt *sopt, struct mbuf **mp);
extern int soopt_mcopyin(struct sockopt *sopt, struct mbuf *m);
extern int soopt_mcopyout(struct sockopt *sopt, struct mbuf *m);
extern boolean_t so_cache_timer(void);

extern void mptcp_fallback_sbdrop(struct socket *so, struct mbuf *m, int len);
extern void mptcp_preproc_sbdrop(struct socket *, struct mbuf *, unsigned int);
extern void mptcp_postproc_sbdrop(struct mbuf *, u_int64_t, u_int32_t,
    u_int32_t);

extern void netpolicy_post_msg(uint32_t, struct netpolicy_event_data *,
    uint32_t);

extern int tcp_notsent_lowat_check(struct socket *so);

extern user_ssize_t uio_array_resid(struct uio **, u_int);
extern user_ssize_t recv_msg_array_resid(struct recv_msg_elem *, u_int);

void sotoxsocket_n(struct socket *, struct xsocket_n *);
void sbtoxsockbuf_n(struct sockbuf *, struct xsockbuf_n *);
void sbtoxsockstat_n(struct socket *, struct xsockstat_n *);

__END_DECLS
#endif /* BSD_KERNEL_PRIVATE */
#endif /* KERNEL_PRIVATE */

// Tracker actions
enum so_tracker_action {
	SO_TRACKER_ACTION_INVALID = 0,
	SO_TRACKER_ACTION_ADD = 1,
	SO_TRACKER_ACTION_DUMP_BY_APP = 2,
	SO_TRACKER_ACTION_DUMP_ALL = 3,
	SO_TRACKER_ACTION_DUMP_MAX,
};

// Tracker TLV attributes
enum so_tracker_attribute {
	SO_TRACKER_ATTRIBUTE_INVALID = 0,
	SO_TRACKER_ATTRIBUTE_ADDRESS_FAMILY = 1,
	SO_TRACKER_ATTRIBUTE_ADDRESS  = 2,
	SO_TRACKER_ATTRIBUTE_APP_UUID = 3,
	SO_TRACKER_ATTRIBUTE_DOMAIN = 4,
	SO_TRACKER_ATTRIBUTE_DOMAIN_OWNER = 5,
	SO_TRACKER_ATTRIBUTE_FLAGS = 6,
	SO_TRACKER_ATTRIBUTE_DUMP_ENTRY = 7,
	SO_TRACKER_ATTRIBUTE_MEMORY_USED = 8,
	SO_TRACKER_ATTRIBUTE_MAX,
};

// Tracker flags
#define SO_TRACKER_ATTRIBUTE_FLAGS_APP_APPROVED     0x00000001
#define SO_TRACKER_ATTRIBUTE_FLAGS_TRACKER          0x00000002
#define SO_TRACKER_ATTRIBUTE_FLAGS_DOMAIN_SHORT     0x00000004

#ifndef KERNEL
#define SO_TRACKER_TRANSPARENCY_VERSION         3
extern int tracker_action(int action, char *buffer, size_t buffer_size);
#endif

#endif /* !_SYS_SOCKETVAR_H_ */