text: /*-
   * SPDX-License-Identifier: BSD-3-Clause
   *
   * Copyright (c) 2006-2007, by Cisco Systems, Inc. All rights reserved.
   * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved.
   * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved.
   * Copyright (c) 2008-2011, by Brad Penoff. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * a) Redistributions of source code must retain the above copyright notice,
   *   this list of conditions and the following disclaimer.
   *
   * b) 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.
   *
   * c) Neither the name of Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
   */
  
  #ifndef __sctp_os_userspace_h__
  #define __sctp_os_userspace_h__
  /*
   * Userspace includes
   * All the opt_xxx.h files are placed in the kernel build directory.
   * We will place them in userspace stack build directory.
   */
  
  #include <errno.h>
  
  #if defined(__Userspace_os_Windows)
  #include <winsock2.h>
  #include <ws2tcpip.h>
  #include <iphlpapi.h>
  #include <Mswsock.h>
  #include <Windows.h>
  #include "user_environment.h"
  typedef CRITICAL_SECTION userland_mutex_t;
  #if WINVER < 0x0600
  enum {
  	C_SIGNAL = 0,
  	C_BROADCAST = 1,
  	C_MAX_EVENTS = 2
  };
  typedef struct
  {
  	u_int waiters_count;
  	CRITICAL_SECTION waiters_count_lock;
  	HANDLE events_[C_MAX_EVENTS];
  } userland_cond_t;
  void InitializeXPConditionVariable(userland_cond_t *);
  void DeleteXPConditionVariable(userland_cond_t *);
  int SleepXPConditionVariable(userland_cond_t *, userland_mutex_t *);
  void WakeAllXPConditionVariable(userland_cond_t *);
  #define InitializeConditionVariable(cond) InitializeXPConditionVariable(cond)
  #define DeleteConditionVariable(cond) DeleteXPConditionVariable(cond)
  #define SleepConditionVariableCS(cond, mtx, time) SleepXPConditionVariable(cond, mtx)
  #define WakeAllConditionVariable(cond) WakeAllXPConditionVariable(cond)
  #else
  #define DeleteConditionVariable(cond)
  typedef CONDITION_VARIABLE userland_cond_t;
  #endif
  typedef HANDLE userland_thread_t;
  #define ADDRESS_FAMILY	unsigned __int8
  #define IPVERSION  4
  #define MAXTTL     255
  /* VS2010 comes with stdint.h */
  #if !defined(_MSC_VER) || _MSC_VER >= 1600
  #include <stdint.h>
  #else
  #define uint64_t   unsigned __int64
  #define uint32_t   unsigned __int32
  #define int32_t    __int32
  #define uint16_t   unsigned __int16
  #define int16_t    __int16
  #define uint8_t    unsigned __int8
  #define int8_t     __int8
  #endif
  #ifndef _SIZE_T_DEFINED
  #define size_t     __int32
  #endif
  #define u_long     unsigned __int64
  #define u_int      unsigned __int32
  #define u_int32_t  unsigned __int32
  #define u_int16_t  unsigned __int16
  #define u_int8_t   unsigned __int8
  #define u_char     unsigned char
  #define n_short    unsigned __int16
  #define u_short    unsigned __int16
  #define n_time     unsigned __int32
  #define sa_family_t unsigned __int8
  #define ssize_t    __int64
  #define __func__	__FUNCTION__
  
  #ifdef SCTP_USE_WINSOCK_CODES
  #undef EWOULDBLOCK
  #undef EINPROGRESS
  #undef EALREADY
  #undef ENOTSOCK
  #undef EDESTADDRREQ
  #undef EMSGSIZE
  #undef EPROTOTYPE
  #undef ENOPROTOOPT
  #undef EPROTONOSUPPORT
  #undef ESOCKTNOSUPPORT
  #undef EOPNOTSUPP
  #undef ENOTSUP
  #undef EPFNOSUPPORT
  #undef EAFNOSUPPORT
  #undef EADDRINUSE
  #undef EADDRNOTAVAIL
  #undef ENETDOWN
  #undef ENETUNREACH
  #undef ENETRESET
  #undef ECONNABORTED
  #undef ECONNRESET
  #undef ENOBUFS
  #undef EISCONN
  #undef ENOTCONN
  #undef ESHUTDOWN
  #undef ETOOMANYREFS
  #undef ETIMEDOUT
  #undef ECONNREFUSED
  #undef ELOOP
  #undef EHOSTDOWN
  #undef EHOSTUNREACH
  #undef EPROCLIM
  #undef EUSERS
  #undef EDQUOT
  #undef ESTALE
  #undef EREMOTE
  #endif
  
  #ifndef EWOULDBLOCK
  #define EWOULDBLOCK             WSAEWOULDBLOCK
  #endif
  #ifndef EINPROGRESS
  #define EINPROGRESS             WSAEINPROGRESS
  #endif
  #ifndef EALREADY
  #define EALREADY                WSAEALREADY
  #endif
  #ifndef ENOTSOCK
  #define ENOTSOCK                WSAENOTSOCK
  #endif
  #ifndef EDESTADDRREQ
  #define EDESTADDRREQ            WSAEDESTADDRREQ
  #endif
  #ifndef EMSGSIZE
  #define EMSGSIZE                WSAEMSGSIZE
  #endif
  #ifndef EPROTOTYPE
  #define EPROTOTYPE              WSAEPROTOTYPE
  #endif
  #ifndef ENOPROTOOPT
  #define ENOPROTOOPT             WSAENOPROTOOPT
  #endif
  #ifndef EPROTONOSUPPORT
  #define EPROTONOSUPPORT         WSAEPROTONOSUPPORT
  #endif
  #ifndef ESOCKTNOSUPPORT
  #define ESOCKTNOSUPPORT         WSAESOCKTNOSUPPORT
  #endif
  #ifndef EOPNOTSUPP
  #define EOPNOTSUPP              WSAEOPNOTSUPP
  #endif
  #ifndef ENOTSUP
  #define ENOTSUP                 WSAEOPNOTSUPP
  #endif
  #ifndef EPFNOSUPPORT
  #define EPFNOSUPPORT            WSAEPFNOSUPPORT
  #endif
  #ifndef EAFNOSUPPORT
  #define EAFNOSUPPORT            WSAEAFNOSUPPORT
  #endif
  #ifndef EADDRINUSE
  #define EADDRINUSE              WSAEADDRINUSE
  #endif
  #ifndef EADDRNOTAVAIL
  #define EADDRNOTAVAIL           WSAEADDRNOTAVAIL
  #endif
  #ifndef ENETDOWN
  #define ENETDOWN                WSAENETDOWN
  #endif
  #ifndef ENETUNREACH
  #define ENETUNREACH             WSAENETUNREACH
  #endif
  #ifndef ENETRESET
  #define ENETRESET               WSAENETRESET
  #endif
  #ifndef ECONNABORTED
  #define ECONNABORTED            WSAECONNABORTED
  #endif
  #ifndef ECONNRESET
  #define ECONNRESET              WSAECONNRESET
  #endif
  #ifndef ENOBUFS
  #define ENOBUFS                 WSAENOBUFS
  #endif
  #ifndef EISCONN
  #define EISCONN                 WSAEISCONN
  #endif
  #ifndef ENOTCONN
  #define ENOTCONN                WSAENOTCONN
  #endif
  #ifndef ESHUTDOWN
  #define ESHUTDOWN               WSAESHUTDOWN
  #endif
  #ifndef ETOOMANYREFS
  #define ETOOMANYREFS            WSAETOOMANYREFS
  #endif
  #ifndef ETIMEDOUT
  #define ETIMEDOUT               WSAETIMEDOUT
  #endif
  #ifndef ECONNREFUSED
  #define ECONNREFUSED            WSAECONNREFUSED
  #endif
  #ifndef ELOOP
  #define ELOOP                   WSAELOOP
  #endif
  #ifndef EHOSTDOWN
  #define EHOSTDOWN               WSAEHOSTDOWN
  #endif
  #ifndef EHOSTUNREACH
  #define EHOSTUNREACH            WSAEHOSTUNREACH
  #endif
  #ifndef EPROCLIM
  #define EPROCLIM                WSAEPROCLIM
  #endif
  #ifndef EUSERS
  #define EUSERS                  WSAEUSERS
  #endif
  #ifndef EDQUOT
  #define EDQUOT                  WSAEDQUOT
  #endif
  #ifndef ESTALE
  #define ESTALE                  WSAESTALE
  #endif
  #ifndef EREMOTE
  #define EREMOTE                 WSAEREMOTE
  #endif
  
  typedef char* caddr_t;
  
  #define bzero(buf, len) memset(buf, 0, len)
  #define bcopy(srcKey, dstKey, len) memcpy(dstKey, srcKey, len)
  #ifdef _MSC_VER
  #if _MSC_VER < 1900
  #define snprintf(data, size, format, ...) _snprintf_s(data, size, _TRUNCATE, format, __VA_ARGS__)
  #endif
  #define inline __inline
  #define __inline__ __inline
  #endif
  #define	MSG_EOR		0x8		/* data completes record */
  #define	MSG_DONTWAIT	0x80		/* this message should be nonblocking */
  
  #ifdef CMSG_DATA
  #undef CMSG_DATA
  #endif
  /*
   * The following definitions should apply iff WINVER < 0x0600
   * but that check doesn't work in all cases. So be more pedantic...
   */
  #define CMSG_DATA(x) WSA_CMSG_DATA(x)
  #define CMSG_ALIGN(x) WSA_CMSGDATA_ALIGN(x)
  #ifndef CMSG_FIRSTHDR
  #define CMSG_FIRSTHDR(x) WSA_CMSG_FIRSTHDR(x)
  #endif
  #ifndef CMSG_NXTHDR
  #define CMSG_NXTHDR(x, y) WSA_CMSG_NXTHDR(x, y)
  #endif
  #ifndef CMSG_SPACE
  #define CMSG_SPACE(x) WSA_CMSG_SPACE(x)
  #endif
  #ifndef CMSG_LEN
  #define CMSG_LEN(x) WSA_CMSG_LEN(x)
  #endif
  
  /****  from sctp_os_windows.h ***************/
  #define SCTP_IFN_IS_IFT_LOOP(ifn)	((ifn)->ifn_type == IFT_LOOP)
  #define SCTP_ROUTE_IS_REAL_LOOP(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifa && (ro)->ro_rt->rt_ifa->ifa_ifp && (ro)->ro_rt->rt_ifa->ifa_ifp->if_type == IFT_LOOP)
  
  /*
   * Access to IFN's to help with src-addr-selection
   */
  /* This could return VOID if the index works but for BSD we provide both. */
  #define SCTP_GET_IFN_VOID_FROM_ROUTE(ro) \
  	((ro)->ro_rt != NULL ? (ro)->ro_rt->rt_ifp : NULL)
  #define SCTP_ROUTE_HAS_VALID_IFN(ro) \
  	((ro)->ro_rt && (ro)->ro_rt->rt_ifp)
  /******************************************/
  
  #define SCTP_GET_IF_INDEX_FROM_ROUTE(ro) 1 /* compiles...  TODO use routing socket to determine */
  
  #define BIG_ENDIAN 1
  #define LITTLE_ENDIAN 0
  #ifdef WORDS_BIGENDIAN
  #define BYTE_ORDER BIG_ENDIAN
  #else
  #define BYTE_ORDER LITTLE_ENDIAN
  #endif
  
  #else /* !defined(Userspace_os_Windows) */
  #include <sys/socket.h>
  #if defined(__Userspace_os_DragonFly) || defined(__Userspace_os_FreeBSD) || defined(__Userspace_os_Linux) || defined(__Userspace_os_NetBSD) || defined(__Userspace_os_OpenBSD) || defined(__Userspace_os_NaCl) || defined(__Userspace_os_Fuchsia)
  #include <pthread.h>
  #endif
  typedef pthread_mutex_t userland_mutex_t;
  typedef pthread_cond_t userland_cond_t;
  typedef pthread_t userland_thread_t;
  #endif
  
  #if defined(__Userspace_os_Windows) || defined(__Userspace_os_NaCl)
  
  #define IFNAMSIZ 64
  
  #define random() rand()
  #define srandom(s) srand(s)
  
  #define timeradd(tvp, uvp, vvp)   \
  	do {                          \
  	    (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;  \
  		(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec;  \
  		if ((vvp)->tv_usec >= 1000000) {                   \
  		    (vvp)->tv_sec++;                        \
  			(vvp)->tv_usec -= 1000000;             \
  		}                         \
  	} while (0)
  
  #define timersub(tvp, uvp, vvp)   \
  	do {                          \
  	    (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;  \
  		(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;  \
  		if ((vvp)->tv_usec < 0) {                   \
  		    (vvp)->tv_sec--;                        \
  			(vvp)->tv_usec += 1000000;             \
  		}                       \
  	} while (0)
  
  /*#include <packon.h>
  #pragma pack(push, 1)*/
  struct ip {
  	u_char    ip_hl:4, ip_v:4;
  	u_char    ip_tos;
  	u_short   ip_len;
  	u_short   ip_id;
  	u_short   ip_off;
  #define IP_RP 0x8000
  #define IP_DF 0x4000
  #define IP_MF 0x2000
  #define IP_OFFMASK 0x1fff
  	u_char    ip_ttl;
  	u_char    ip_p;
  	u_short   ip_sum;
  	struct in_addr ip_src, ip_dst;
  };
  
  struct ifaddrs {
  	struct ifaddrs  *ifa_next;
  	char		*ifa_name;
  	unsigned int		 ifa_flags;
  	struct sockaddr	*ifa_addr;
  	struct sockaddr	*ifa_netmask;
  	struct sockaddr	*ifa_dstaddr;
  	void		*ifa_data;
  };
  
  struct udphdr {
  	uint16_t uh_sport;
  	uint16_t uh_dport;
  	uint16_t uh_ulen;
  	uint16_t uh_sum;
  };
  
  struct iovec {
  	size_t len;
  	char *buf;
  };
  
  #define iov_base buf
  #define iov_len	len
  
  struct ifa_msghdr {
  	uint16_t         ifam_msglen;
  	unsigned char    ifam_version;
  	unsigned char    ifam_type;
  	uint32_t         ifam_addrs;
  	uint32_t         ifam_flags;
  	uint16_t         ifam_index;
  	uint32_t         ifam_metric;
  };
  
  struct ifdevmtu {
  	int ifdm_current;
  	int ifdm_min;
  	int ifdm_max;
  };
  
  struct ifkpi {
  	unsigned int  ifk_module_id;
  	unsigned int  ifk_type;
  	union {
  		void *ifk_ptr;
  		int ifk_value;
  	} ifk_data;
  };
  
  struct ifreq {
  	char    ifr_name[16];
  	union {
  		struct sockaddr ifru_addr;
  		struct sockaddr ifru_dstaddr;
  		struct sockaddr ifru_broadaddr;
  		short  ifru_flags;
  		int ifru_metric;
  		int ifru_mtu;
  		int ifru_phys;
  		int ifru_media;
  		int    ifru_intval;
  		char*  ifru_data;
  		struct ifdevmtu ifru_devmtu;
  		struct ifkpi  ifru_kpi;
  		uint32_t ifru_wake_flags;
  	} ifr_ifru;
  #define ifr_addr        ifr_ifru.ifru_addr
  #define ifr_dstaddr     ifr_ifru.ifru_dstaddr
  #define ifr_broadaddr   ifr_ifru.ifru_broadaddr
  #define ifr_flags       ifr_ifru.ifru_flags[0]
  #define ifr_prevflags   ifr_ifru.ifru_flags[1]
  #define ifr_metric      ifr_ifru.ifru_metric
  #define ifr_mtu         ifr_ifru.ifru_mtu
  #define ifr_phys        ifr_ifru.ifru_phys
  #define ifr_media       ifr_ifru.ifru_media
  #define ifr_data        ifr_ifru.ifru_data
  #define ifr_devmtu      ifr_ifru.ifru_devmtu
  #define ifr_intval      ifr_ifru.ifru_intval
  #define ifr_kpi         ifr_ifru.ifru_kpi
  #define ifr_wake_flags  ifr_ifru.ifru_wake_flags
  };
  
  #endif
  
  #if defined(__Userspace_os_Windows)
  int Win_getifaddrs(struct ifaddrs**);
  #define getifaddrs(interfaces)  (int)Win_getifaddrs(interfaces)
  int win_if_nametoindex(const char *);
  #define if_nametoindex(x) win_if_nametoindex(x)
  
  #else /* !defined(Userspace_os_Windows) */
  #if defined(__ANDROID__)
  #define in_addr_t uint32_t
  #endif
  #endif
  
  #define mtx_lock(arg1)
  #define mtx_unlock(arg1)
  #define mtx_assert(arg1,arg2)
  #define MA_OWNED 7 /* sys/mutex.h typically on FreeBSD */
  #if !defined(__Userspace_os_FreeBSD)
  struct mtx {int dummy;};
  #if !defined(__Userspace_os_NetBSD)
  struct selinfo {int dummy;};
  #endif
  struct sx {int dummy;};
  #endif
  
  #include <stdio.h>
  #include <string.h>
  /* #include <sys/param.h>  in FreeBSD defines MSIZE */
  /* #include <sys/ktr.h> */
  /* #include <sys/systm.h> */
  #if defined(HAVE_SYS_QUEUE_H)
  #include <sys/queue.h>
  #else
  #include <user_queue.h>
  #endif
  #include <user_malloc.h>
  /* #include <sys/kernel.h> */
  /* #include <sys/sysctl.h> */
  /* #include <sys/protosw.h> */
  /* on FreeBSD, this results in a redefintion of SOCK(BUF)_(UN)LOCK and
   *  uknown type of struct mtx for sb_mtx in struct sockbuf */
  #include "user_socketvar.h" /* MALLOC_DECLARE's M_PCB. Replacement for sys/socketvar.h */
  /* #include <sys/jail.h> */
  /* #include <sys/sysctl.h> */
  #include <user_environment.h>
  #include <user_atomic.h>
  #include <user_mbuf.h>
  /* #include <sys/uio.h> */
  /* #include <sys/lock.h> */
  #if defined(__FreeBSD__) && __FreeBSD_version > 602000
  #include <sys/rwlock.h>
  #endif
  /* #include <sys/kthread.h> */
  #if defined(__FreeBSD__) && __FreeBSD_version > 602000
  #include <sys/priv.h>
  #endif
  /* #include <sys/random.h> */
  #include <limits.h>
  /* #include <machine/cpu.h> */
  
  #if defined(__Userspace_os_Darwin)
  /* was a 0 byte file.  needed for structs if_data(64) and net_event_data */
  #include <net/if_var.h>
  #endif
  #if defined(__Userspace_os_FreeBSD)
  #include <net/if_types.h>
  /* #include <net/if_var.h> was a 0 byte file.  causes struct mtx redefinition */
  #endif
  /* OOTB only - dummy route used at the moment. should we port route to
   *  userspace as well? */
  /* on FreeBSD, this results in a redefintion of struct route */
  /* #include <net/route.h> */
  #if !defined(__Userspace_os_Windows) && !defined(__Userspace_os_NaCl)
  #include <net/if.h>
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #endif
  #if defined(HAVE_NETINET_IP_ICMP_H)
  #include <netinet/ip_icmp.h>
  #else
  #include <user_ip_icmp.h>
  #endif
  /* #include <netinet/in_pcb.h> ported to userspace */
  #include <user_inpcb.h>
  
  /* for getifaddrs */
  #include <sys/types.h>
  #if !defined(__Userspace_os_Windows)
  #if defined(INET) || defined(INET6)
  #include <ifaddrs.h>
  #endif
  
  /* for ioctl */
  #include <sys/ioctl.h>
  
  /* for close, etc. */
  #include <unistd.h>
  #endif
  
  /* lots of errno's used and needed in userspace */
  
  /* for offsetof */
  #include <stddef.h>
  
  #if defined(SCTP_PROCESS_LEVEL_LOCKS) && !defined(__Userspace_os_Windows)
  /* for pthread_mutex_lock, pthread_mutex_unlock, etc. */
  #include <pthread.h>
  #endif
  
  #ifdef IPSEC
  #include <netipsec/ipsec.h>
  #include <netipsec/key.h>
  #endif				/* IPSEC */
  
  #ifdef INET6
  #if defined(__Userspace_os_FreeBSD)
  #include <sys/domain.h>
  #endif
  #ifdef IPSEC
  #include <netipsec/ipsec6.h>
  #endif
  #if !defined(__Userspace_os_Windows)
  #include <netinet/ip6.h>
  #endif
  #if defined(__Userspace_os_Darwin) || defined(__Userspace_os_FreeBSD) || defined(__Userspace_os_Linux) || defined(__Userspace_os_NetBSD) || defined(__Userspace_os_OpenBSD) || defined(__Userspace_os_Windows)
  #include "user_ip6_var.h"
  #else
  #include <netinet6/ip6_var.h>
  #endif
  #if defined(__Userspace_os_FreeBSD)
  #include <netinet6/in6_pcb.h>
  #include <netinet6/ip6protosw.h>
  /* #include <netinet6/nd6.h> was a 0 byte file */
  #include <netinet6/scope6_var.h>
  #endif
  #endif /* INET6 */
  
  #if defined(HAVE_SCTP_PEELOFF_SOCKOPT)
  #include <sys/file.h>
  #include <sys/filedesc.h>
  #endif
  
  #include "netinet/sctp_sha1.h"
  
  #if __FreeBSD_version >= 700000
  #include <netinet/ip_options.h>
  #endif
  
  #define SCTP_PRINTF(...)                                  \
  	if (SCTP_BASE_VAR(debug_printf)) {                \
  		SCTP_BASE_VAR(debug_printf)(__VA_ARGS__); \
  	}
  
  #if defined(__FreeBSD__)
  #ifndef in6pcb
  #define in6pcb		inpcb
  #endif
  #endif
  /* Declare all the malloc names for all the various mallocs */
  MALLOC_DECLARE(SCTP_M_MAP);
  MALLOC_DECLARE(SCTP_M_STRMI);
  MALLOC_DECLARE(SCTP_M_STRMO);
  MALLOC_DECLARE(SCTP_M_ASC_ADDR);
  MALLOC_DECLARE(SCTP_M_ASC_IT);
  MALLOC_DECLARE(SCTP_M_AUTH_CL);
  MALLOC_DECLARE(SCTP_M_AUTH_KY);
  MALLOC_DECLARE(SCTP_M_AUTH_HL);
  MALLOC_DECLARE(SCTP_M_AUTH_IF);
  MALLOC_DECLARE(SCTP_M_STRESET);
  MALLOC_DECLARE(SCTP_M_CMSG);
  MALLOC_DECLARE(SCTP_M_COPYAL);
  MALLOC_DECLARE(SCTP_M_VRF);
  MALLOC_DECLARE(SCTP_M_IFA);
  MALLOC_DECLARE(SCTP_M_IFN);
  MALLOC_DECLARE(SCTP_M_TIMW);
  MALLOC_DECLARE(SCTP_M_MVRF);
  MALLOC_DECLARE(SCTP_M_ITER);
  MALLOC_DECLARE(SCTP_M_SOCKOPT);
  
  #if defined(SCTP_LOCAL_TRACE_BUF)
  
  #define SCTP_GET_CYCLECOUNT get_cyclecount()
  #define SCTP_CTR6 sctp_log_trace
  
  #else
  #define SCTP_CTR6 CTR6
  #endif
  
  /* Empty ktr statement for _Userspace__ (similar to what is done for mac) */
  #define	CTR6(m, d, p1, p2, p3, p4, p5, p6)
  
  
  
  #define SCTP_BASE_INFO(__m) system_base_info.sctppcbinfo.__m
  #define SCTP_BASE_STATS system_base_info.sctpstat
  #define SCTP_BASE_STAT(__m)     system_base_info.sctpstat.__m
  #define SCTP_BASE_SYSCTL(__m) system_base_info.sctpsysctl.__m
  #define SCTP_BASE_VAR(__m) system_base_info.__m
  
  /*
   *
   */
  #if !defined(__Userspace_os_Darwin)
  #define USER_ADDR_NULL	(NULL)		/* FIX ME: temp */
  #endif
  
  //#if defined(SCTP_DEBUG)
  #include <netinet/sctp_constants.h>
  #define SCTPDBG(level, ...)					\
  {								\
  	do {							\
  		if (1 /*SCTP_BASE_SYSCTL(sctp_debug_on) & level*/) {	\
  			SCTP_PRINTF(__VA_ARGS__);		\
  		}						\
  	} while (0);						\
  }
  #define SCTPDBG_ADDR(level, addr)				\
  {								\
  	do {							\
  		if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) {	\
  		    sctp_print_address(addr);			\
  		}						\
  	} while (0);						\
  }
  //#else
  //#define SCTPDBG(level, ...)
  //#define SCTPDBG_ADDR(level, addr)
  //#endif
  
  #ifdef SCTP_LTRACE_CHUNKS
  #define SCTP_LTRACE_CHK(a, b, c, d) if(sctp_logging_level & SCTP_LTRACE_CHUNK_ENABLE) CTR6(KTR_SUBSYS, "SCTP:%d[%d]:%x-%x-%x-%x", SCTP_LOG_CHUNK_PROC, 0, a, b, c, d)
  #else
  #define SCTP_LTRACE_CHK(a, b, c, d)
  #endif
  
  #ifdef SCTP_LTRACE_ERRORS
  #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err) \
  	if (sctp_logging_level & SCTP_LTRACE_ERROR_ENABLE) \
  		SCTP_PRINTF("mbuf:%p inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \
  		            (void *)m, (void *)inp, (void *)stcb, (void *)net, file, __LINE__, err);
  #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err) \
  	if (sctp_logging_level & SCTP_LTRACE_ERROR_ENABLE) \
  		SCTP_PRINTF("inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \
  		            (void *)inp, (void *)stcb, (void *)net, file, __LINE__, err);
  #else
  #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err)
  #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err)
  #endif
  
  
  /*
   * Local address and interface list handling
   */
  #define SCTP_MAX_VRF_ID		0
  #define SCTP_SIZE_OF_VRF_HASH	3
  #define SCTP_IFNAMSIZ		IFNAMSIZ
  #define SCTP_DEFAULT_VRFID	0
  #define SCTP_VRF_ADDR_HASH_SIZE	16
  #define SCTP_VRF_IFN_HASH_SIZE	3
  #define	SCTP_INIT_VRF_TABLEID(vrf)
  
  #if !defined(__Userspace_os_Windows)
  #define SCTP_IFN_IS_IFT_LOOP(ifn) (strncmp((ifn)->ifn_name, "lo", 2) == 0)
  /* BSD definition */
  /* #define SCTP_ROUTE_IS_REAL_LOOP(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifa && (ro)->ro_rt->rt_ifa->ifa_ifp && (ro)->ro_rt->rt_ifa->ifa_ifp->if_type == IFT_LOOP) */
  /* only used in IPv6 scenario, which isn't supported yet */
  #define SCTP_ROUTE_IS_REAL_LOOP(ro) 0
  
  /*
   * Access to IFN's to help with src-addr-selection
   */
  /* This could return VOID if the index works but for BSD we provide both. */
  #define SCTP_GET_IFN_VOID_FROM_ROUTE(ro) (void *)ro->ro_rt->rt_ifp
  #define SCTP_GET_IF_INDEX_FROM_ROUTE(ro) 1 /* compiles...  TODO use routing socket to determine */
  #define SCTP_ROUTE_HAS_VALID_IFN(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifp)
  #endif
  
  /*
   * general memory allocation
   */
  #define SCTP_MALLOC(var, type, size, name)				\
  	do {								\
  		MALLOC(var, type, size, name, M_NOWAIT);		\
  	} while (0)
  
  #define SCTP_FREE(var, type)	FREE(var, type)
  
  #define SCTP_MALLOC_SONAME(var, type, size)				\
  	do {								\
  		MALLOC(var, type, size, M_SONAME, (M_WAITOK | M_ZERO));	\
  	} while (0)
  
  #define SCTP_FREE_SONAME(var)	FREE(var, M_SONAME)
  
  #define SCTP_PROCESS_STRUCT struct proc *
  
  /*
   * zone allocation functions
   */
  
  
  #if defined(SCTP_SIMPLE_ALLOCATOR)
  /*typedef size_t sctp_zone_t;*/
  #define SCTP_ZONE_INIT(zone, name, size, number) { \
  	zone = size; \
  }
  
  /* __Userspace__ SCTP_ZONE_GET: allocate element from the zone */
  #define SCTP_ZONE_GET(zone, type)  \
          (type *)malloc(zone);
  
  
  /* __Userspace__ SCTP_ZONE_FREE: free element from the zone */
  #define SCTP_ZONE_FREE(zone, element) { \
  	free(element);  \
  }
  
  #define SCTP_ZONE_DESTROY(zone)
  #else
  /*__Userspace__
    Compiling & linking notes: Needs libumem, which has been placed in ./user_lib
    All userspace header files are in ./user_include. Makefile will need the
    following.
    CFLAGS = -I./ -Wall
    LDFLAGS = -L./user_lib -R./user_lib -lumem
  */
  #include "user_include/umem.h"
  
  /* __Userspace__ SCTP_ZONE_INIT: initialize the zone */
  /*
    __Userspace__
    No equivalent function to uma_zone_set_max added yet. (See SCTP_ZONE_INIT in sctp_os_bsd.h
    for reference). It may not be required as mentioned in
    http://nixdoc.net/man-pages/FreeBSD/uma_zalloc.9.html that
    max limits may not enforced on systems with more than one CPU.
  */
  #define SCTP_ZONE_INIT(zone, name, size, number) { \
  	zone = umem_cache_create(name, size, 0, NULL, NULL, NULL, NULL, NULL, 0); \
    }
  
  /* __Userspace__ SCTP_ZONE_GET: allocate element from the zone */
  #define SCTP_ZONE_GET(zone, type) \
          (type *)umem_cache_alloc(zone, UMEM_DEFAULT);
  
  
  /* __Userspace__ SCTP_ZONE_FREE: free element from the zone */
  #define SCTP_ZONE_FREE(zone, element) \
  	umem_cache_free(zone, element);
  
  
  /* __Userspace__ SCTP_ZONE_DESTROY: destroy the zone */
  #define SCTP_ZONE_DESTROY(zone) \
  	umem_cache_destroy(zone);
  #endif
  
  /*
   * __Userspace__ Defining sctp_hashinit_flags() and sctp_hashdestroy() for userland.
   */
  void *sctp_hashinit_flags(int elements, struct malloc_type *type,
                      u_long *hashmask, int flags);
  void
  sctp_hashdestroy(void *vhashtbl, struct malloc_type *type, u_long hashmask);
  
  void
  sctp_hashfreedestroy(void *vhashtbl, struct malloc_type *type, u_long hashmask);
  
  
  #define HASH_NOWAIT 0x00000001
  #define HASH_WAITOK 0x00000002
  
  /* M_PCB is MALLOC_DECLARE'd in sys/socketvar.h */
  #define SCTP_HASH_INIT(size, hashmark) sctp_hashinit_flags(size, M_PCB, hashmark, HASH_NOWAIT)
  
  #define SCTP_HASH_FREE(table, hashmark) sctp_hashdestroy(table, M_PCB, hashmark)
  
  #define SCTP_HASH_FREE_DESTROY(table, hashmark)  sctp_hashfreedestroy(table, M_PCB, hashmark)
  #define SCTP_M_COPYM	m_copym
  
  /*
   * timers
   */
  /* __Userspace__
   * user_sctp_callout.h has typedef struct sctp_callout sctp_os_timer_t;
   * which is used in the timer related functions such as
   * SCTP_OS_TIMER_INIT etc.
  */
  #include <netinet/sctp_callout.h>
  
  /* __Userspace__ Creating a receive thread */
  #include <user_recv_thread.h>
  
  /*__Userspace__ defining KTR_SUBSYS 1 as done in sctp_os_macosx.h */
  #define KTR_SUBSYS 1
  
  /* The packed define for 64 bit platforms */
  #if !defined(__Userspace_os_Windows)
  #define SCTP_PACKED __attribute__((packed))
  #define SCTP_UNUSED __attribute__((unused))
  #else
  #define SCTP_PACKED
  #define SCTP_UNUSED
  #endif
  
  /*
   * Functions
   */
  /* Mbuf manipulation and access macros  */
  #define SCTP_BUF_LEN(m) (m->m_len)
  #define SCTP_BUF_NEXT(m) (m->m_next)
  #define SCTP_BUF_NEXT_PKT(m) (m->m_nextpkt)
  #define SCTP_BUF_RESV_UF(m, size) m->m_data += size
  #define SCTP_BUF_AT(m, size) m->m_data + size
  #define SCTP_BUF_IS_EXTENDED(m) (m->m_flags & M_EXT)
  #define SCTP_BUF_EXTEND_SIZE(m) (m->m_ext.ext_size)
  #define SCTP_BUF_TYPE(m) (m->m_type)
  #define SCTP_BUF_RECVIF(m) (m->m_pkthdr.rcvif)
  #define SCTP_BUF_PREPEND	M_PREPEND
  
  #define SCTP_ALIGN_TO_END(m, len) if(m->m_flags & M_PKTHDR) { \
                                       MH_ALIGN(m, len); \
                                    } else if ((m->m_flags & M_EXT) == 0) { \
                                       M_ALIGN(m, len); \
                                    }
  
  /* We make it so if you have up to 4 threads
   * writting based on the default size of
   * the packet log 65 k, that would be
   * 4 16k packets before we would hit
   * a problem.
   */
  #define SCTP_PKTLOG_WRITERS_NEED_LOCK 3
  
  
  /*
   * routes, output, etc.
   */
  
  typedef struct sctp_route	sctp_route_t;
  typedef struct sctp_rtentry	sctp_rtentry_t;
  
  static inline void sctp_userspace_rtalloc(sctp_route_t *ro)
  {
  	if (ro->ro_rt != NULL) {
  		ro->ro_rt->rt_refcnt++;
  		return;
  	}
  
  	ro->ro_rt = (sctp_rtentry_t *) malloc(sizeof(sctp_rtentry_t));
  	if (ro->ro_rt == NULL)
  		return;
  
  	/* initialize */
  	memset(ro->ro_rt, 0, sizeof(sctp_rtentry_t));
  	ro->ro_rt->rt_refcnt = 1;
  
  	/* set MTU */
  	/* TODO set this based on the ro->ro_dst, looking up MTU with routing socket */
  #if 0
  	if (userspace_rawroute == -1) {
  		userspace_rawroute = socket(AF_ROUTE, SOCK_RAW, 0);
  		if (userspace_rawroute == -1)
  			return;
  	}
  #endif
  	ro->ro_rt->rt_rmx.rmx_mtu = 1500; /* FIXME temporary solution */
  
  	/* TODO enable the ability to obtain interface index of route for
  	 *  SCTP_GET_IF_INDEX_FROM_ROUTE macro.
  	 */
  }
  #define SCTP_RTALLOC(ro, vrf_id, fibnum) sctp_userspace_rtalloc((sctp_route_t *)ro)
  
  /* dummy rtfree needed once user_route.h is included */
  static inline void sctp_userspace_rtfree(sctp_rtentry_t *rt)
  {
  	if(rt == NULL) {
  		return;
  	}
  	if(--rt->rt_refcnt > 0) {
  		return;
  	}
  	free(rt);
  	rt = NULL;
  }
  #define rtfree(arg1) sctp_userspace_rtfree(arg1)
  
  
  /*************************/
  /*      MTU              */
  /*************************/
  int sctp_userspace_get_mtu_from_ifn(uint32_t if_index, int af);
  
  #define SCTP_GATHER_MTU_FROM_IFN_INFO(ifn, ifn_index, af) sctp_userspace_get_mtu_from_ifn(ifn_index, af)
  
  #define SCTP_GATHER_MTU_FROM_ROUTE(sctp_ifa, sa, rt) ((rt != NULL) ? rt->rt_rmx.rmx_mtu : 0)
  
  #define SCTP_GATHER_MTU_FROM_INTFC(sctp_ifn)  sctp_userspace_get_mtu_from_ifn(if_nametoindex(((struct ifaddrs *) (sctp_ifn))->ifa_name), AF_INET)
  
  #define SCTP_SET_MTU_OF_ROUTE(sa, rt, mtu) do { \
                                                if (rt != NULL) \
                                                   rt->rt_rmx.rmx_mtu = mtu; \
                                             } while(0)
  
  /* (de-)register interface event notifications */
  #define SCTP_REGISTER_INTERFACE(ifhandle, af)
  #define SCTP_DEREGISTER_INTERFACE(ifhandle, af)
  
  
  /*************************/
  /* These are for logging */
  /*************************/
  /* return the base ext data pointer */
  #define SCTP_BUF_EXTEND_BASE(m) (m->m_ext.ext_buf)
   /* return the refcnt of the data pointer */
  #define SCTP_BUF_EXTEND_REFCNT(m) (*m->m_ext.ref_cnt)
  /* return any buffer related flags, this is
   * used beyond logging for apple only.
   */
  #define SCTP_BUF_GET_FLAGS(m) (m->m_flags)
  
  /* For BSD this just accesses the M_PKTHDR length
   * so it operates on an mbuf with hdr flag. Other
   * O/S's may have seperate packet header and mbuf
   * chain pointers.. thus the macro.
   */
  #define SCTP_HEADER_TO_CHAIN(m) (m)
  #define SCTP_DETACH_HEADER_FROM_CHAIN(m)
  #define SCTP_HEADER_LEN(m) ((m)->m_pkthdr.len)
  #define SCTP_GET_HEADER_FOR_OUTPUT(o_pak) 0
  #define SCTP_RELEASE_HEADER(m)
  #define SCTP_RELEASE_PKT(m)	sctp_m_freem(m)
  
  #define SCTP_GET_PKT_VRFID(m, vrf_id)  ((vrf_id = SCTP_DEFAULT_VRFID) != SCTP_DEFAULT_VRFID)
  
  
  
  /* Attach the chain of data into the sendable packet. */
  #define SCTP_ATTACH_CHAIN(pak, m, packet_length) do { \
                                                    pak = m; \
                                                    pak->m_pkthdr.len = packet_length; \
                            } while(0)
  
  /* Other m_pkthdr type things */
  /* FIXME need real definitions */
  #define SCTP_IS_IT_BROADCAST(dst, m) 0
  /* OOTB only #define SCTP_IS_IT_BROADCAST(dst, m) ((m->m_flags & M_PKTHDR) ? in_broadcast(dst, m->m_pkthdr.rcvif) : 0)  BSD def */
  #define SCTP_IS_IT_LOOPBACK(m) 0
  /* OOTB ONLY #define SCTP_IS_IT_LOOPBACK(m) ((m->m_flags & M_PKTHDR) && ((m->m_pkthdr.rcvif == NULL) || (m->m_pkthdr.rcvif->if_type == IFT_LOOP)))  BSD def */
  
  
  /* This converts any input packet header
   * into the chain of data holders, for BSD
   * its a NOP.
   */
  
  /* get the v6 hop limit */
  #define SCTP_GET_HLIM(inp, ro) 128 /* As done for __Windows__ */
  #define IPv6_HOP_LIMIT 128
  
  /* is the endpoint v6only? */
  #define SCTP_IPV6_V6ONLY(inp)	(((struct inpcb *)inp)->inp_flags & IN6P_IPV6_V6ONLY)
  /* is the socket non-blocking? */
  #define SCTP_SO_IS_NBIO(so)	((so)->so_state & SS_NBIO)
  #define SCTP_SET_SO_NBIO(so)	((so)->so_state |= SS_NBIO)
  #define SCTP_CLEAR_SO_NBIO(so)	((so)->so_state &= ~SS_NBIO)
  /* get the socket type */
  #define SCTP_SO_TYPE(so)	((so)->so_type)
  
  /* reserve sb space for a socket */
  #define SCTP_SORESERVE(so, send, recv)	soreserve(so, send, recv)
  
  /* wakeup a socket */
  #define SCTP_SOWAKEUP(so)	wakeup(&(so)->so_timeo, so)
  /* clear the socket buffer state */
  #define SCTP_SB_CLEAR(sb)	\
  	(sb).sb_cc = 0;		\
  	(sb).sb_mb = NULL;	\
  	(sb).sb_mbcnt = 0;
  
  #define SCTP_SB_LIMIT_RCV(so) so->so_rcv.sb_hiwat
  #define SCTP_SB_LIMIT_SND(so) so->so_snd.sb_hiwat
  
  #define SCTP_READ_RANDOM(buf, len)	read_random(buf, len)
  
  #define SCTP_SHA1_CTX		struct sctp_sha1_context
  #define SCTP_SHA1_INIT		sctp_sha1_init
  #define SCTP_SHA1_UPDATE	sctp_sha1_update
  #define SCTP_SHA1_FINAL(x,y)	sctp_sha1_final((unsigned char *)x, y)
  
  /* start OOTB only stuff */
  /* TODO IFT_LOOP is in net/if_types.h on Linux */
  #define IFT_LOOP 0x18
  
  /* sctp_pcb.h */
  
  #if defined(__Userspace_os_Windows)
  #define SHUT_RD 1
  #define SHUT_WR 2
  #define SHUT_RDWR 3
  #endif
  #define PRU_FLUSH_RD SHUT_RD
  #define PRU_FLUSH_WR SHUT_WR
  #define PRU_FLUSH_RDWR SHUT_RDWR
  
  /* netinet/ip_var.h defintions are behind an if defined for _KERNEL on FreeBSD */
  #define	IP_RAWOUTPUT		0x2
  
  
  /* end OOTB only stuff */
  
  #define AF_CONN 123
  struct sockaddr_conn {
  #ifdef HAVE_SCONN_LEN
  	uint8_t sconn_len;
  	uint8_t sconn_family;
  #else
  	uint16_t sconn_family;
  #endif
  	uint16_t sconn_port;
  	void *sconn_addr;
  };
  
  typedef void *(*start_routine_t)(void *);
  
  extern int
  sctp_userspace_thread_create(userland_thread_t *thread, start_routine_t start_routine);
  
  void
  sctp_userspace_set_threadname(const char *name);
  
  /*
   * SCTP protocol specific mbuf flags.
   */
  #define	M_NOTIFICATION		M_PROTO5	/* SCTP notification */
  
  /*
   * IP output routines
   */
  
  /* Defining SCTP_IP_ID macro.
     In netinet/ip_output.c, we have u_short ip_id;
     In netinet/ip_var.h, we have extern u_short	ip_id; (enclosed within _KERNEL_)
     See static __inline uint16_t ip_newid(void) in netinet/ip_var.h
   */
  #define SCTP_IP_ID(inp) (ip_id)
  
  /* need sctphdr to get port in SCTP_IP_OUTPUT. sctphdr defined in sctp.h  */
  #include <netinet/sctp.h>
  extern void sctp_userspace_ip_output(int *result, struct mbuf *o_pak,
                                       sctp_route_t *ro, void *stcb,
                                       uint32_t vrf_id);
  
  #define SCTP_IP_OUTPUT(result, o_pak, ro, stcb, vrf_id) sctp_userspace_ip_output(&result, o_pak, ro, stcb, vrf_id);
  
  #if defined(INET6)
  extern void sctp_userspace_ip6_output(int *result, struct mbuf *o_pak,
                                        struct route_in6 *ro, void *stcb,
                                        uint32_t vrf_id);
  #define SCTP_IP6_OUTPUT(result, o_pak, ro, ifp, stcb, vrf_id) sctp_userspace_ip6_output(&result, o_pak, ro, stcb, vrf_id);
  #endif
  
  
  
  #if 0
  #define SCTP_IP6_OUTPUT(result, o_pak, ro, ifp, stcb, vrf_id) \
  { \
  	if (stcb && stcb->sctp_ep) \
  		result = ip6_output(o_pak, \
  				    ((struct in6pcb *)(stcb->sctp_ep))->in6p_outputopts, \
  				    (ro), 0, 0, ifp, NULL); \
  	else \
  		result = ip6_output(o_pak, NULL, (ro), 0, 0, ifp, NULL); \
  }
  #endif
  
  struct mbuf *
  sctp_get_mbuf_for_msg(unsigned int space_needed, int want_header, int how, int allonebuf, int type);
  
  
  /* with the current included files, this is defined in Linux but
   *  in FreeBSD, it is behind a _KERNEL in sys/socket.h ...
   */
  #if defined(__Userspace_os_DragonFly) || defined(__Userspace_os_FreeBSD) || defined(__Userspace_os_OpenBSD) || defined(__Userspace_os_NaCl)
  /* stolen from /usr/include/sys/socket.h */
  #define CMSG_ALIGN(n)   _ALIGN(n)
  #elif defined(__Userspace_os_NetBSD)
  #define CMSG_ALIGN(n)   (((n) + __ALIGNBYTES) & ~__ALIGNBYTES)
  #elif defined(__Userspace_os_Darwin)
  #if !defined(__DARWIN_ALIGNBYTES)
  #define	__DARWIN_ALIGNBYTES	(sizeof(__darwin_size_t) - 1)
  #endif
  
  #if !defined(__DARWIN_ALIGN)
  #define	__DARWIN_ALIGN(p)	((__darwin_size_t)((char *)(uintptr_t)(p) + __DARWIN_ALIGNBYTES) &~ __DARWIN_ALIGNBYTES)
  #endif
  
  #if !defined(__DARWIN_ALIGNBYTES32)
  #define __DARWIN_ALIGNBYTES32     (sizeof(__uint32_t) - 1)
  #endif
  
  #if !defined(__DARWIN_ALIGN32)
  #define __DARWIN_ALIGN32(p)       ((__darwin_size_t)((char *)(uintptr_t)(p) + __DARWIN_ALIGNBYTES32) &~ __DARWIN_ALIGNBYTES32)
  #endif
  #define CMSG_ALIGN(n)   __DARWIN_ALIGN32(n)
  #endif
  #define I_AM_HERE \
                  do { \
  			SCTP_PRINTF("%s:%d at %s\n", __FILE__, __LINE__ , __func__); \
  		} while (0)
  
  #ifndef timevalsub
  #define timevalsub(tp1, tp2)                       \
  	do {                                       \
  		(tp1)->tv_sec -= (tp2)->tv_sec;    \
  		(tp1)->tv_usec -= (tp2)->tv_usec;  \
  		if ((tp1)->tv_usec < 0) {          \
  			(tp1)->tv_sec--;           \
  			(tp1)->tv_usec += 1000000; \
  		}                                  \
  	} while (0)
  #endif
  
  #if defined(__Userspace_os_Linux)
  #if !defined(TAILQ_FOREACH_SAFE)
  #define TAILQ_FOREACH_SAFE(var, head, field, tvar)             \
           for ((var) = ((head)->tqh_first);                     \
                (var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
                (var) = (tvar))
  #endif
  #if !defined(LIST_FOREACH_SAFE)
  #define LIST_FOREACH_SAFE(var, head, field, tvar)              \
           for ((var) = ((head)->lh_first);                      \
                (var) && ((tvar) = LIST_NEXT((var), field), 1);  \
                (var) = (tvar))
  #endif
  #endif
  #if defined(__Userspace_os_DragonFly)
  #define TAILQ_FOREACH_SAFE TAILQ_FOREACH_MUTABLE
  #define LIST_FOREACH_SAFE LIST_FOREACH_MUTABLE
  #endif
  
  #if defined(__Userspace_os_NaCl)
  #define	timercmp(tvp, uvp, cmp)						\
  	(((tvp)->tv_sec == (uvp)->tv_sec) ?				\
  	    ((tvp)->tv_usec cmp (uvp)->tv_usec) :			\
  	    ((tvp)->tv_sec cmp (uvp)->tv_sec))
  #endif
  
  #define SCTP_IS_LISTENING(inp) ((inp->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING) != 0)
  
  #if defined(__Userspace_os_DragonFly) || defined(__Userspace_os_Linux) || defined(__Userspace_os_NaCl) || defined(__Userspace_os_NetBSD) || defined(__Userspace_os_Windows)
  int
  timingsafe_bcmp(const void *, const void *, size_t );
  #endif
  
  #endif
  