FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.h

     /*      $NetBSD: in.h,v 1.83 2008/01/25 21:12:14 joerg Exp $    */
     
     /*
      * 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. 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.h        8.3 (Berkeley) 1/3/94
     */
    
    /*
     * Constants and structures defined by the internet system,
     * Per RFC 790, September 1981, and numerous additions.
     */
    
    #ifndef _NETINET_IN_H_
    #define _NETINET_IN_H_
    
    #include <machine/int_types.h>
    
    #ifndef uint8_t
    typedef __uint8_t       uint8_t;
    #define uint8_t         __uint8_t
    #endif
    
    #ifndef uint32_t
    typedef __uint32_t      uint32_t;
    #define uint32_t        __uint32_t
    #endif
    
    #include <sys/ansi.h>
    
    #ifndef in_addr_t
    typedef __in_addr_t     in_addr_t;
    #define in_addr_t       __in_addr_t
    #endif
    
    #ifndef in_port_t
    typedef __in_port_t     in_port_t;
    #define in_port_t       __in_port_t
    #endif
    
    #ifndef sa_family_t
    typedef __sa_family_t   sa_family_t;
    #define sa_family_t     __sa_family_t
    #endif
    
    /*
     * Protocols
     */
    #define IPPROTO_IP              0               /* dummy for IP */
    #define IPPROTO_HOPOPTS         0               /* IP6 hop-by-hop options */
    #define IPPROTO_ICMP            1               /* control message protocol */
    #define IPPROTO_IGMP            2               /* group mgmt protocol */
    #define IPPROTO_GGP             3               /* gateway^2 (deprecated) */
    #define IPPROTO_IPV4            4               /* IP header */
    #define IPPROTO_IPIP            4               /* IP inside IP */
    #define IPPROTO_TCP             6               /* tcp */
    #define IPPROTO_EGP             8               /* exterior gateway protocol */
    #define IPPROTO_PUP             12              /* pup */
    #define IPPROTO_UDP             17              /* user datagram protocol */
    #define IPPROTO_IDP             22              /* xns idp */
    #define IPPROTO_TP              29              /* tp-4 w/ class negotiation */
    #define IPPROTO_IPV6            41              /* IP6 header */
    #define IPPROTO_ROUTING         43              /* IP6 routing header */
    #define IPPROTO_FRAGMENT        44              /* IP6 fragmentation header */
    #define IPPROTO_RSVP            46              /* resource reservation */
    #define IPPROTO_GRE             47              /* GRE encaps RFC 1701 */
    #define IPPROTO_ESP             50              /* encap. security payload */
    #define IPPROTO_AH              51              /* authentication header */
    #define IPPROTO_MOBILE          55              /* IP Mobility RFC 2004 */
    #define IPPROTO_IPV6_ICMP       58              /* IPv6 ICMP */
    #define IPPROTO_ICMPV6          58              /* ICMP6 */
    #define IPPROTO_NONE            59              /* IP6 no next header */
    #define IPPROTO_DSTOPTS         60              /* IP6 destination option */
    #define IPPROTO_EON             80              /* ISO cnlp */
   #define IPPROTO_ETHERIP         97              /* Ethernet-in-IP */
   #define IPPROTO_ENCAP           98              /* encapsulation header */
   #define IPPROTO_PIM             103             /* Protocol indep. multicast */
   #define IPPROTO_IPCOMP          108             /* IP Payload Comp. Protocol */
   #define IPPROTO_VRRP            112             /* VRRP RFC 2338 */
   #define IPPROTO_CARP            112             /* Common Address Resolution Protocol */
   #define IPPROTO_RAW             255             /* raw IP packet */
   #define IPPROTO_MAX             256
   
   /* last return value of *_input(), meaning "all job for this pkt is done".  */
   #define IPPROTO_DONE            257
   
   /* sysctl placeholder for (FAST_)IPSEC */
   #define CTL_IPPROTO_IPSEC       258
   
   
   /*
    * Local port number conventions:
    *
    * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
    * unless a kernel is compiled with IPNOPRIVPORTS defined.
    *
    * When a user does a bind(2) or connect(2) with a port number of zero,
    * a non-conflicting local port address is chosen.
    *
    * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
    * that is settable by sysctl(3); net.inet.ip.anonportmin and
    * net.inet.ip.anonportmax respectively.
    *
    * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
    * default assignment range.
    *
    * The value IP_PORTRANGE_DEFAULT causes the default behavior.
    *
    * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
    * and exists only for FreeBSD compatibility purposes.
    *
    * The value IP_PORTRANGE_LOW changes the range to the "low" are
    * that is (by convention) restricted to privileged processes.
    * This convention is based on "vouchsafe" principles only.
    * It is only secure if you trust the remote host to restrict these ports.
    * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
    */
   
   #define IPPORT_RESERVED         1024
   #define IPPORT_ANONMIN          49152
   #define IPPORT_ANONMAX          65535
   #define IPPORT_RESERVEDMIN      600
   #define IPPORT_RESERVEDMAX      (IPPORT_RESERVED-1)
   
   /*
    * Internet address (a structure for historical reasons)
    */
   struct in_addr {
           in_addr_t s_addr;
   } __packed;
   
   /*
    * Definitions of bits in internet address integers.
    * On subnets, the decomposition of addresses to host and net parts
    * is done according to subnet mask, not the masks here.
    *
    * By byte-swapping the constants, we avoid ever having to byte-swap IP
    * addresses inside the kernel.  Unfortunately, user-level programs rely
    * on these macros not doing byte-swapping.
    */
   #ifdef _KERNEL
   #define __IPADDR(x)     ((uint32_t) htonl((uint32_t)(x)))
   #else
   #define __IPADDR(x)     ((uint32_t)(x))
   #endif
   
   #define IN_CLASSA(i)            (((uint32_t)(i) & __IPADDR(0x80000000)) == \
                                    __IPADDR(0x00000000))
   #define IN_CLASSA_NET           __IPADDR(0xff000000)
   #define IN_CLASSA_NSHIFT        24
   #define IN_CLASSA_HOST          __IPADDR(0x00ffffff)
   #define IN_CLASSA_MAX           128
   
   #define IN_CLASSB(i)            (((uint32_t)(i) & __IPADDR(0xc0000000)) == \
                                    __IPADDR(0x80000000))
   #define IN_CLASSB_NET           __IPADDR(0xffff0000)
   #define IN_CLASSB_NSHIFT        16
   #define IN_CLASSB_HOST          __IPADDR(0x0000ffff)
   #define IN_CLASSB_MAX           65536
   
   #define IN_CLASSC(i)            (((uint32_t)(i) & __IPADDR(0xe0000000)) == \
                                    __IPADDR(0xc0000000))
   #define IN_CLASSC_NET           __IPADDR(0xffffff00)
   #define IN_CLASSC_NSHIFT        8
   #define IN_CLASSC_HOST          __IPADDR(0x000000ff)
   
   #define IN_CLASSD(i)            (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
                                    __IPADDR(0xe0000000))
   /* These ones aren't really net and host fields, but routing needn't know. */
   #define IN_CLASSD_NET           __IPADDR(0xf0000000)
   #define IN_CLASSD_NSHIFT        28
   #define IN_CLASSD_HOST          __IPADDR(0x0fffffff)
   #define IN_MULTICAST(i)         IN_CLASSD(i)
   
   #define IN_EXPERIMENTAL(i)      (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
                                    __IPADDR(0xf0000000))
   #define IN_BADCLASS(i)          (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
                                    __IPADDR(0xf0000000))
   
   #define IN_LINKLOCAL(i) (((uint32_t)(i) & __IPADDR(0xffff0000)) == \
                            __IPADDR(0xa9fe0000))
   
   #define IN_PRIVATE(i)   ((((uint32_t)(i) & __IPADDR(0xff000000)) ==     \
                             __IPADDR(0x0a000000)) ||                      \
                            (((uint32_t)(i) & __IPADDR(0xfff00000)) ==     \
                             __IPADDR(0xac100000)) ||                      \
                            (((uint32_t)(i) & __IPADDR(0xffff0000)) ==     \
                             __IPADDR(0xc0a80000)))
   
   #define IN_LOCAL_GROUP(i)       (((uint32_t)(i) & __IPADDR(0xffffff00)) == \
                                    __IPADDR(0xe0000000))
   
   #define IN_ANY_LOCAL(i)         (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
   
   #define INADDR_ANY              __IPADDR(0x00000000)
   #define INADDR_LOOPBACK         __IPADDR(0x7f000001)
   #define INADDR_BROADCAST        __IPADDR(0xffffffff)    /* must be masked */
   #define INADDR_NONE             __IPADDR(0xffffffff)    /* -1 return */
   
   #define INADDR_UNSPEC_GROUP     __IPADDR(0xe0000000)    /* 224.0.0.0 */
   #define INADDR_ALLHOSTS_GROUP   __IPADDR(0xe0000001)    /* 224.0.0.1 */
   #define INADDR_ALLRTRS_GROUP    __IPADDR(0xe0000002)    /* 224.0.0.2 */
   #define INADDR_CARP_GROUP       __IPADDR(0xe0000012)    /* 224.0.0.18 */
   #define INADDR_MAX_LOCAL_GROUP  __IPADDR(0xe00000ff)    /* 224.0.0.255 */
   
   #define IN_LOOPBACKNET          127                     /* official! */
   
   /*
    * Socket address, internet style.
    */
   struct sockaddr_in {
           uint8_t         sin_len;
           sa_family_t     sin_family;
           in_port_t       sin_port;
           struct in_addr  sin_addr;
           __int8_t        sin_zero[8];
   };
   
   #define INET_ADDRSTRLEN                 16
   
   /*
    * Structure used to describe IP options.
    * Used to store options internally, to pass them to a process,
    * or to restore options retrieved earlier.
    * The ip_dst is used for the first-hop gateway when using a source route
    * (this gets put into the header proper).
    */
   struct ip_opts {
           struct in_addr  ip_dst;         /* first hop, 0 w/o src rt */
   #if defined(__cplusplus)
           __int8_t        Ip_opts[40];    /* actually variable in size */
   #else
           __int8_t        ip_opts[40];    /* actually variable in size */
   #endif
   };
   
   /*
    * Options for use with [gs]etsockopt at the IP level.
    * First word of comment is data type; bool is stored in int.
    */
   #define IP_OPTIONS              1    /* buf/ip_opts; set/get IP options */
   #define IP_HDRINCL              2    /* int; header is included with data */
   #define IP_TOS                  3    /* int; IP type of service and preced. */
   #define IP_TTL                  4    /* int; IP time to live */
   #define IP_RECVOPTS             5    /* bool; receive all IP opts w/dgram */
   #define IP_RECVRETOPTS          6    /* bool; receive IP opts for response */
   #define IP_RECVDSTADDR          7    /* bool; receive IP dst addr w/dgram */
   #define IP_RETOPTS              8    /* ip_opts; set/get IP options */
   #define IP_MULTICAST_IF         9    /* in_addr; set/get IP multicast i/f  */
   #define IP_MULTICAST_TTL        10   /* u_char; set/get IP multicast ttl */
   #define IP_MULTICAST_LOOP       11   /* u_char; set/get IP multicast loopback */
   #define IP_ADD_MEMBERSHIP       12   /* ip_mreq; add an IP group membership */
   #define IP_DROP_MEMBERSHIP      13   /* ip_mreq; drop an IP group membership */
   #define IP_PORTRANGE            19   /* int; range to use for ephemeral port */
   #define IP_RECVIF               20   /* bool; receive reception if w/dgram */
   #define IP_ERRORMTU             21   /* int; get MTU of last xmit = EMSGSIZE */
   #if 1 /*IPSEC*/
   #define IP_IPSEC_POLICY         22 /* struct; get/set security policy */
   #endif
   
   /*
    * Defaults and limits for options
    */
   #define IP_DEFAULT_MULTICAST_TTL  1     /* normally limit m'casts to 1 hop  */
   #define IP_DEFAULT_MULTICAST_LOOP 1     /* normally hear sends if a member  */
   #define IP_MAX_MEMBERSHIPS      20      /* per socket; must fit in one mbuf */
   
   /*
    * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
    */
   struct ip_mreq {
           struct  in_addr imr_multiaddr;  /* IP multicast address of group */
           struct  in_addr imr_interface;  /* local IP address of interface */
   };
   
   /*
    * Argument for IP_PORTRANGE:
    * - which range to search when port is unspecified at bind() or connect()
    */
   #define IP_PORTRANGE_DEFAULT    0       /* default range */
   #define IP_PORTRANGE_HIGH       1       /* same as DEFAULT (FreeBSD compat) */
   #define IP_PORTRANGE_LOW        2       /* use privileged range */
   
   #if defined(_NETBSD_SOURCE)
   /*
    * Definitions for inet sysctl operations.
    *
    * Third level is protocol number.
    * Fourth level is desired variable within that protocol.
    */
   #define IPPROTO_MAXID   (IPPROTO_AH + 1)        /* don't list to IPPROTO_MAX */
   
   #define CTL_IPPROTO_NAMES { \
           { "ip", CTLTYPE_NODE }, \
           { "icmp", CTLTYPE_NODE }, \
           { "igmp", CTLTYPE_NODE }, \
           { "ggp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "tcp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { "egp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "pup", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "udp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "idp", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "ipsec", CTLTYPE_NODE }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { 0, 0 }, \
           { "pim", CTLTYPE_NODE }, \
   }
   
   /*
    * Names for IP sysctl objects
    */
   #define IPCTL_FORWARDING        1       /* act as router */
   #define IPCTL_SENDREDIRECTS     2       /* may send redirects when forwarding */
   #define IPCTL_DEFTTL            3       /* default TTL */
   #ifdef notyet
   #define IPCTL_DEFMTU            4       /* default MTU */
   #endif
   #define IPCTL_FORWSRCRT         5       /* forward source-routed packets */
   #define IPCTL_DIRECTEDBCAST     6       /* default broadcast behavior */
   #define IPCTL_ALLOWSRCRT        7       /* allow/drop all source-routed pkts */
   #define IPCTL_SUBNETSARELOCAL   8       /* treat subnets as local addresses */
   #define IPCTL_MTUDISC           9       /* allow path MTU discovery */
   #define IPCTL_ANONPORTMIN      10       /* minimum ephemeral port */
   #define IPCTL_ANONPORTMAX      11       /* maximum ephemeral port */
   #define IPCTL_MTUDISCTIMEOUT   12       /* allow path MTU discovery */
   #define IPCTL_MAXFLOWS         13       /* maximum ip flows allowed */
   #define IPCTL_HOSTZEROBROADCAST 14      /* is host zero a broadcast addr? */
   #define IPCTL_GIF_TTL          15       /* default TTL for gif encap packet */
   #define IPCTL_LOWPORTMIN       16       /* minimum reserved port */
   #define IPCTL_LOWPORTMAX       17       /* maximum reserved port */
   #define IPCTL_MAXFRAGPACKETS   18       /* max packets reassembly queue */
   #define IPCTL_GRE_TTL          19       /* default TTL for gre encap packet */
   #define IPCTL_CHECKINTERFACE   20       /* drop pkts in from 'wrong' iface */
   #define IPCTL_IFQ              21       /* ipintrq node */
   #define IPCTL_RANDOMID         22       /* use random IP ids (if configured) */
   #define IPCTL_LOOPBACKCKSUM    23       /* do IP checksum on loopback */
   #define IPCTL_STATS             24      /* IP statistics */
   #define IPCTL_MAXID            25
   
   #define IPCTL_NAMES { \
           { 0, 0 }, \
           { "forwarding", CTLTYPE_INT }, \
           { "redirect", CTLTYPE_INT }, \
           { "ttl", CTLTYPE_INT }, \
           { "mtu", CTLTYPE_INT }, \
           { "forwsrcrt", CTLTYPE_INT }, \
           { "directed-broadcast", CTLTYPE_INT }, \
           { "allowsrcrt", CTLTYPE_INT }, \
           { "subnetsarelocal", CTLTYPE_INT }, \
           { "mtudisc", CTLTYPE_INT }, \
           { "anonportmin", CTLTYPE_INT }, \
           { "anonportmax", CTLTYPE_INT }, \
           { "mtudisctimeout", CTLTYPE_INT }, \
           { "maxflows", CTLTYPE_INT }, \
           { "hostzerobroadcast", CTLTYPE_INT }, \
           { "gifttl", CTLTYPE_INT }, \
           { "lowportmin", CTLTYPE_INT }, \
           { "lowportmax", CTLTYPE_INT }, \
           { "maxfragpackets", CTLTYPE_INT }, \
           { "grettl", CTLTYPE_INT }, \
           { "checkinterface", CTLTYPE_INT }, \
           { "ifq", CTLTYPE_NODE }, \
           { "random_id", CTLTYPE_INT }, \
           { "do_loopback_cksum", CTLTYPE_INT }, \
           { "stats", CTLTYPE_STRUCT }, \
   }
   #endif /* _NETBSD_SOURCE */
   
   /* INET6 stuff */
   #define __KAME_NETINET_IN_H_INCLUDED_
   #include <netinet6/in6.h>
   #undef __KAME_NETINET_IN_H_INCLUDED_
   
   #ifdef _KERNEL
   /*
    * in_cksum_phdr:
    *
    *      Compute significant parts of the IPv4 checksum pseudo-header
    *      for use in a delayed TCP/UDP checksum calculation.
    *
    *      Args:
    *
    *              src             Source IP address
    *              dst             Destination IP address
    *              lenproto        htons(proto-hdr-len + proto-number)
    */
   static __inline u_int16_t __unused
   in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto)
   {
           u_int32_t sum;
   
           sum = lenproto +
                 (u_int16_t)(src >> 16) +
                 (u_int16_t)(src /*& 0xffff*/) +
                 (u_int16_t)(dst >> 16) +
                 (u_int16_t)(dst /*& 0xffff*/);
   
           sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
   
           if (sum > 0xffff)
                   sum -= 0xffff;
   
           return (sum);
   }
   
   /*
    * in_cksum_addword:
    *
    *      Add the two 16-bit network-order values, carry, and return.
    */
   static __inline u_int16_t __unused
   in_cksum_addword(u_int16_t a, u_int16_t b)
   {
           u_int32_t sum = a + b;
   
           if (sum > 0xffff)
                   sum -= 0xffff;
   
           return (sum);
   }
   
   extern  struct in_addr zeroin_addr;
   extern  u_char  ip_protox[];
   extern const struct sockaddr_in in_any;
   
   int     in_broadcast(struct in_addr, struct ifnet *);
   int     in_canforward(struct in_addr);
   int     cpu_in_cksum(struct mbuf *, int, int, uint32_t);
   int     in_cksum(struct mbuf *, int);
   int     in4_cksum(struct mbuf *, u_int8_t, int, int);
   void    in_delayed_cksum(struct mbuf *);
   int     in_localaddr(struct in_addr);
   void    in_socktrim(struct sockaddr_in *);
   
   #define in_hosteq(s,t)  ((s).s_addr == (t).s_addr)
   #define in_nullhost(x)  ((x).s_addr == INADDR_ANY)
   
   #define satosin(sa)     ((struct sockaddr_in *)(sa))
   #define satocsin(sa)    ((const struct sockaddr_in *)(sa))
   #define sintosa(sin)    ((struct sockaddr *)(sin))
   #define sintocsa(sin)   ((const struct sockaddr *)(sin))
   #define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))
   
   int sockaddr_in_cmp(const struct sockaddr *, const struct sockaddr *);
   const void *sockaddr_in_const_addr(const struct sockaddr *, socklen_t *);
   void *sockaddr_in_addr(struct sockaddr *, socklen_t *);
   
   static inline void
   sockaddr_in_init1(struct sockaddr_in *sin, const struct in_addr *addr,
       in_port_t port)
   {
           sin->sin_port = port;
           sin->sin_addr = *addr;
           memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
   }
   
   static inline void
   sockaddr_in_init(struct sockaddr_in *sin, const struct in_addr *addr,
       in_port_t port)
   {
           sin->sin_family = AF_INET;
           sin->sin_len = sizeof(*sin);
           sockaddr_in_init1(sin, addr, port);
   }
   
   static inline struct sockaddr *
   sockaddr_in_alloc(const struct in_addr *addr, in_port_t port, int flags)
   {
           struct sockaddr *sa;
   
           sa = sockaddr_alloc(AF_INET, sizeof(struct sockaddr_in), flags);
   
           if (sa == NULL)
                   return NULL;
   
           sockaddr_in_init1(satosin(sa), addr, port);
   
           return sa;
   }
   #endif /* _KERNEL */
   
   #endif /* !_NETINET_IN_H_ */

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