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in.h revision 1.112
      1 /*	$NetBSD: in.h,v 1.112 2021/02/03 05:51:40 roy Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)in.h	8.3 (Berkeley) 1/3/94
     32  */
     33 
     34 /*
     35  * Constants and structures defined by the internet system,
     36  * Per RFC 790, September 1981, and numerous additions.
     37  */
     38 
     39 #ifndef _NETINET_IN_H_
     40 #define	_NETINET_IN_H_
     41 
     42 #include <sys/featuretest.h>
     43 #include <machine/int_types.h>
     44 
     45 #ifndef	_BSD_UINT8_T_
     46 typedef __uint8_t	uint8_t;
     47 #define	_BSD_UINT8_T_
     48 #endif
     49 
     50 #ifndef	_BSD_UINT32_T_
     51 typedef __uint32_t	uint32_t;
     52 #define	_BSD_UINT32_T_
     53 #endif
     54 
     55 #include <sys/ansi.h>
     56 
     57 #ifndef in_addr_t
     58 typedef __in_addr_t	in_addr_t;
     59 #define	in_addr_t	__in_addr_t
     60 #endif
     61 
     62 #ifndef in_port_t
     63 typedef __in_port_t	in_port_t;
     64 #define	in_port_t	__in_port_t
     65 #endif
     66 
     67 #ifndef sa_family_t
     68 typedef __sa_family_t	sa_family_t;
     69 #define	sa_family_t	__sa_family_t
     70 #endif
     71 
     72 /*
     73  * Protocols
     74  */
     75 #define	IPPROTO_IP		0		/* dummy for IP */
     76 #define	IPPROTO_HOPOPTS		0		/* IP6 hop-by-hop options */
     77 #define	IPPROTO_ICMP		1		/* control message protocol */
     78 #define	IPPROTO_IGMP		2		/* group mgmt protocol */
     79 #define	IPPROTO_GGP		3		/* gateway^2 (deprecated) */
     80 #define	IPPROTO_IPV4		4 		/* IP header */
     81 #define	IPPROTO_IPIP		4		/* IP inside IP */
     82 #define	IPPROTO_TCP		6		/* tcp */
     83 #define	IPPROTO_EGP		8		/* exterior gateway protocol */
     84 #define	IPPROTO_PUP		12		/* pup */
     85 #define	IPPROTO_UDP		17		/* user datagram protocol */
     86 #define	IPPROTO_IDP		22		/* xns idp */
     87 #define	IPPROTO_TP		29 		/* tp-4 w/ class negotiation */
     88 #define	IPPROTO_DCCP		33		/* DCCP */
     89 #define	IPPROTO_IPV6		41		/* IP6 header */
     90 #define	IPPROTO_ROUTING		43		/* IP6 routing header */
     91 #define	IPPROTO_FRAGMENT	44		/* IP6 fragmentation header */
     92 #define	IPPROTO_RSVP		46		/* resource reservation */
     93 #define	IPPROTO_GRE		47		/* GRE encaps RFC 1701 */
     94 #define	IPPROTO_ESP		50 		/* encap. security payload */
     95 #define	IPPROTO_AH		51 		/* authentication header */
     96 #define	IPPROTO_MOBILE		55		/* IP Mobility RFC 2004 */
     97 #define	IPPROTO_IPV6_ICMP	58		/* IPv6 ICMP */
     98 #define	IPPROTO_ICMPV6		58		/* ICMP6 */
     99 #define	IPPROTO_NONE		59		/* IP6 no next header */
    100 #define	IPPROTO_DSTOPTS		60		/* IP6 destination option */
    101 #define	IPPROTO_EON		80		/* ISO cnlp */
    102 #define	IPPROTO_ETHERIP		97		/* Ethernet-in-IP */
    103 #define	IPPROTO_ENCAP		98		/* encapsulation header */
    104 #define	IPPROTO_PIM		103		/* Protocol indep. multicast */
    105 #define	IPPROTO_IPCOMP		108		/* IP Payload Comp. Protocol */
    106 #define	IPPROTO_VRRP		112		/* VRRP RFC 2338 */
    107 #define	IPPROTO_CARP		112		/* Common Address Resolution Protocol */
    108 #define	IPPROTO_L2TP		115		/* L2TPv3 */
    109 #define	IPPROTO_SCTP		132		/* SCTP */
    110 #define IPPROTO_PFSYNC      240     /* PFSYNC */
    111 #define	IPPROTO_RAW		255		/* raw IP packet */
    112 #define	IPPROTO_MAX		256
    113 
    114 /* last return value of *_input(), meaning "all job for this pkt is done".  */
    115 #define	IPPROTO_DONE		257
    116 
    117 /* sysctl placeholder for (FAST_)IPSEC */
    118 #define CTL_IPPROTO_IPSEC	258
    119 
    120 
    121 /*
    122  * Local port number conventions:
    123  *
    124  * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
    125  * unless a kernel is compiled with IPNOPRIVPORTS defined.
    126  *
    127  * When a user does a bind(2) or connect(2) with a port number of zero,
    128  * a non-conflicting local port address is chosen.
    129  *
    130  * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
    131  * that is settable by sysctl(3); net.inet.ip.anonportmin and
    132  * net.inet.ip.anonportmax respectively.
    133  *
    134  * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
    135  * default assignment range.
    136  *
    137  * The value IP_PORTRANGE_DEFAULT causes the default behavior.
    138  *
    139  * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
    140  * and exists only for FreeBSD compatibility purposes.
    141  *
    142  * The value IP_PORTRANGE_LOW changes the range to the "low" are
    143  * that is (by convention) restricted to privileged processes.
    144  * This convention is based on "vouchsafe" principles only.
    145  * It is only secure if you trust the remote host to restrict these ports.
    146  * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
    147  */
    148 
    149 #define	IPPORT_RESERVED		1024
    150 #define	IPPORT_ANONMIN		49152
    151 #define	IPPORT_ANONMAX		65535
    152 #define	IPPORT_RESERVEDMIN	600
    153 #define	IPPORT_RESERVEDMAX	(IPPORT_RESERVED-1)
    154 
    155 /*
    156  * Internet address (a structure for historical reasons)
    157  */
    158 struct in_addr {
    159 	in_addr_t s_addr;
    160 };
    161 
    162 /*
    163  * Definitions of bits in internet address integers.
    164  * On subnets, the decomposition of addresses to host and net parts
    165  * is done according to subnet mask, not the masks here.
    166  *
    167  * By byte-swapping the constants, we avoid ever having to byte-swap IP
    168  * addresses inside the kernel.  Unfortunately, user-level programs rely
    169  * on these macros not doing byte-swapping.
    170  */
    171 #ifdef _KERNEL
    172 #define	__IPADDR(x)	((uint32_t) htonl((uint32_t)(x)))
    173 #else
    174 #define	__IPADDR(x)	((uint32_t)(x))
    175 #endif
    176 
    177 #define	IN_CLASSA(i)		(((uint32_t)(i) & __IPADDR(0x80000000)) == \
    178 				 __IPADDR(0x00000000))
    179 #define	IN_CLASSA_NET		__IPADDR(0xff000000)
    180 #define	IN_CLASSA_NSHIFT	24
    181 #define	IN_CLASSA_HOST		__IPADDR(0x00ffffff)
    182 #define	IN_CLASSA_MAX		128
    183 
    184 #define	IN_CLASSB(i)		(((uint32_t)(i) & __IPADDR(0xc0000000)) == \
    185 				 __IPADDR(0x80000000))
    186 #define	IN_CLASSB_NET		__IPADDR(0xffff0000)
    187 #define	IN_CLASSB_NSHIFT	16
    188 #define	IN_CLASSB_HOST		__IPADDR(0x0000ffff)
    189 #define	IN_CLASSB_MAX		65536
    190 
    191 #define	IN_CLASSC(i)		(((uint32_t)(i) & __IPADDR(0xe0000000)) == \
    192 				 __IPADDR(0xc0000000))
    193 #define	IN_CLASSC_NET		__IPADDR(0xffffff00)
    194 #define	IN_CLASSC_NSHIFT	8
    195 #define	IN_CLASSC_HOST		__IPADDR(0x000000ff)
    196 
    197 #define	IN_CLASSD(i)		(((uint32_t)(i) & __IPADDR(0xf0000000)) == \
    198 				 __IPADDR(0xe0000000))
    199 /* These ones aren't really net and host fields, but routing needn't know. */
    200 #define	IN_CLASSD_NET		__IPADDR(0xf0000000)
    201 #define	IN_CLASSD_NSHIFT	28
    202 #define	IN_CLASSD_HOST		__IPADDR(0x0fffffff)
    203 #define	IN_MULTICAST(i)		IN_CLASSD(i)
    204 
    205 #define	IN_EXPERIMENTAL(i)	(((uint32_t)(i) & __IPADDR(0xf0000000)) == \
    206 				 __IPADDR(0xf0000000))
    207 #define	IN_BADCLASS(i)		(((uint32_t)(i) & __IPADDR(0xf0000000)) == \
    208 				 __IPADDR(0xf0000000))
    209 
    210 #define IN_LINKLOCAL(i)	(((uint32_t)(i) & __IPADDR(0xffff0000)) == \
    211 			 __IPADDR(0xa9fe0000))
    212 
    213 #define	IN_PRIVATE(i)	((((uint32_t)(i) & __IPADDR(0xff000000)) ==	\
    214 			  __IPADDR(0x0a000000))	||			\
    215 			 (((uint32_t)(i) & __IPADDR(0xfff00000)) ==	\
    216 			  __IPADDR(0xac100000))	||			\
    217 			 (((uint32_t)(i) & __IPADDR(0xffff0000)) ==	\
    218 			  __IPADDR(0xc0a80000)))
    219 
    220 #define	IN_LOCAL_GROUP(i)	(((uint32_t)(i) & __IPADDR(0xffffff00)) == \
    221 				 __IPADDR(0xe0000000))
    222 
    223 #define	IN_ANY_LOCAL(i)		(IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
    224 
    225 #define	INADDR_ANY		__IPADDR(0x00000000)
    226 #define	INADDR_LOOPBACK		__IPADDR(0x7f000001)
    227 #define	INADDR_BROADCAST	__IPADDR(0xffffffff)	/* must be masked */
    228 #define	INADDR_NONE		__IPADDR(0xffffffff)	/* -1 return */
    229 
    230 #define	INADDR_UNSPEC_GROUP	__IPADDR(0xe0000000)	/* 224.0.0.0 */
    231 #define	INADDR_ALLHOSTS_GROUP	__IPADDR(0xe0000001)	/* 224.0.0.1 */
    232 #define	INADDR_ALLRTRS_GROUP	__IPADDR(0xe0000002)	/* 224.0.0.2 */
    233 #define	INADDR_CARP_GROUP	__IPADDR(0xe0000012)	/* 224.0.0.18 */
    234 #define	INADDR_MAX_LOCAL_GROUP	__IPADDR(0xe00000ff)	/* 224.0.0.255 */
    235 
    236 #define	IN_LOOPBACKNET		127			/* official! */
    237 
    238 #define	IN_RFC3021_MASK		__IPADDR(0xfffffffe)
    239 
    240 /*
    241  * Socket address, internet style.
    242  */
    243 struct sockaddr_in {
    244 	uint8_t		sin_len;
    245 	sa_family_t	sin_family;
    246 	in_port_t	sin_port;
    247 	struct in_addr	sin_addr;
    248 	__int8_t	sin_zero[8];
    249 };
    250 
    251 #define	INET_ADDRSTRLEN                 16
    252 
    253 /*
    254  * Structure used to describe IP options.
    255  * Used to store options internally, to pass them to a process,
    256  * or to restore options retrieved earlier.
    257  * The ip_dst is used for the first-hop gateway when using a source route
    258  * (this gets put into the header proper).
    259  */
    260 struct ip_opts {
    261 	struct in_addr	ip_dst;		/* first hop, 0 w/o src rt */
    262 #if defined(__cplusplus)
    263 	__int8_t	Ip_opts[40];	/* actually variable in size */
    264 #else
    265 	__int8_t	ip_opts[40];	/* actually variable in size */
    266 #endif
    267 };
    268 
    269 /*
    270  * Options for use with [gs]etsockopt at the IP level.
    271  * First word of comment is data type; bool is stored in int.
    272  */
    273 #define	IP_OPTIONS		1    /* buf/ip_opts; set/get IP options */
    274 #define	IP_HDRINCL		2    /* int; header is included with data */
    275 #define	IP_TOS			3    /* int; IP type of service and preced. */
    276 #define	IP_TTL			4    /* int; IP time to live */
    277 #define	IP_RECVOPTS		5    /* bool; receive all IP opts w/dgram */
    278 #define	IP_RECVRETOPTS		6    /* bool; receive IP opts for response */
    279 #define	IP_RECVDSTADDR		7    /* bool; receive IP dst addr w/dgram */
    280 #define	IP_RETOPTS		8    /* ip_opts; set/get IP options */
    281 #define	IP_MULTICAST_IF		9    /* in_addr; set/get IP multicast i/f  */
    282 #define	IP_MULTICAST_TTL	10   /* u_char; set/get IP multicast ttl */
    283 #define	IP_MULTICAST_LOOP	11   /* u_char; set/get IP multicast loopback */
    284 /* The add and drop membership option numbers need to match with the v6 ones */
    285 #define	IP_ADD_MEMBERSHIP	12   /* ip_mreq; add an IP group membership */
    286 #define	IP_DROP_MEMBERSHIP	13   /* ip_mreq; drop an IP group membership */
    287 #define	IP_PORTALGO		18   /* int; port selection algo (rfc6056) */
    288 #define	IP_PORTRANGE		19   /* int; range to use for ephemeral port */
    289 #define	IP_RECVIF		20   /* bool; receive reception if w/dgram */
    290 #define	IP_ERRORMTU		21   /* int; get MTU of last xmit = EMSGSIZE */
    291 #define	IP_IPSEC_POLICY		22   /* struct; get/set security policy */
    292 #define	IP_RECVTTL		23   /* bool; receive IP TTL w/dgram */
    293 #define	IP_MINTTL		24   /* minimum TTL for packet or drop */
    294 #define	IP_PKTINFO		25   /* struct; set default src if/addr */
    295 #define	IP_RECVPKTINFO		26   /* int; receive dst if/addr w/dgram */
    296 #define	IP_BINDANY		27   /* bool: allow bind to any address */
    297 #define IP_SENDSRCADDR IP_RECVDSTADDR /* FreeBSD compatibility */
    298 
    299 /*
    300  * Information sent in the control message of a datagram socket for
    301  * IP_PKTINFO and IP_RECVPKTINFO.
    302  */
    303 struct in_pktinfo {
    304 	struct in_addr	ipi_addr;	/* src/dst address */
    305 	unsigned int ipi_ifindex;	/* interface index */
    306 };
    307 
    308 #define ipi_spec_dst ipi_addr	/* Solaris/Linux compatibility */
    309 
    310 /*
    311  * Defaults and limits for options
    312  */
    313 #define	IP_DEFAULT_MULTICAST_TTL  1	/* normally limit m'casts to 1 hop  */
    314 #define	IP_DEFAULT_MULTICAST_LOOP 1	/* normally hear sends if a member  */
    315 #define	IP_MAX_MEMBERSHIPS	20	/* per socket; must fit in one mbuf */
    316 
    317 /*
    318  * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
    319  */
    320 struct ip_mreq {
    321 	struct	in_addr imr_multiaddr;	/* IP multicast address of group */
    322 	struct	in_addr imr_interface;	/* local IP address of interface */
    323 };
    324 
    325 /*
    326  * Argument for IP_PORTRANGE:
    327  * - which range to search when port is unspecified at bind() or connect()
    328  */
    329 #define	IP_PORTRANGE_DEFAULT	0	/* default range */
    330 #define	IP_PORTRANGE_HIGH	1	/* same as DEFAULT (FreeBSD compat) */
    331 #define	IP_PORTRANGE_LOW	2	/* use privileged range */
    332 
    333 #if defined(_NETBSD_SOURCE)
    334 /*
    335  * Definitions for inet sysctl operations.
    336  *
    337  * Third level is protocol number.
    338  * Fourth level is desired variable within that protocol.
    339  */
    340 
    341 /*
    342  * Names for IP sysctl objects
    343  */
    344 #define	IPCTL_FORWARDING	1	/* act as router */
    345 #define	IPCTL_SENDREDIRECTS	2	/* may send redirects when forwarding */
    346 #define	IPCTL_DEFTTL		3	/* default TTL */
    347 /* IPCTL_DEFMTU=4, never implemented */
    348 #define	IPCTL_FORWSRCRT		5	/* forward source-routed packets */
    349 #define	IPCTL_DIRECTEDBCAST	6	/* default broadcast behavior */
    350 #define	IPCTL_ALLOWSRCRT	7	/* allow/drop all source-routed pkts */
    351 #define	IPCTL_SUBNETSARELOCAL	8	/* treat subnets as local addresses */
    352 #define	IPCTL_MTUDISC		9	/* allow path MTU discovery */
    353 #define	IPCTL_ANONPORTMIN      10	/* minimum ephemeral port */
    354 #define	IPCTL_ANONPORTMAX      11	/* maximum ephemeral port */
    355 #define	IPCTL_MTUDISCTIMEOUT   12	/* allow path MTU discovery */
    356 #define	IPCTL_MAXFLOWS         13	/* maximum ip flows allowed */
    357 #define	IPCTL_HOSTZEROBROADCAST 14	/* is host zero a broadcast addr? */
    358 #define	IPCTL_GIF_TTL 	       15	/* default TTL for gif encap packet */
    359 #define	IPCTL_LOWPORTMIN       16	/* minimum reserved port */
    360 #define	IPCTL_LOWPORTMAX       17	/* maximum reserved port */
    361 #define	IPCTL_MAXFRAGPACKETS   18	/* max packets reassembly queue */
    362 #define	IPCTL_GRE_TTL          19	/* default TTL for gre encap packet */
    363 #define	IPCTL_CHECKINTERFACE   20	/* drop pkts in from 'wrong' iface */
    364 #define	IPCTL_IFQ	       21	/* IP packet input queue */
    365 #define	IPCTL_RANDOMID	       22	/* use random IP ids (if configured) */
    366 #define	IPCTL_LOOPBACKCKSUM    23	/* do IP checksum on loopback */
    367 #define	IPCTL_STATS		24	/* IP statistics */
    368 #define	IPCTL_DAD_COUNT        25	/* DAD packets to send */
    369 
    370 #endif /* _NETBSD_SOURCE */
    371 
    372 /* INET6 stuff */
    373 #define	__KAME_NETINET_IN_H_INCLUDED_
    374 #include <netinet6/in6.h>
    375 #undef __KAME_NETINET_IN_H_INCLUDED_
    376 
    377 #ifdef _KERNEL
    378 #include <sys/psref.h>
    379 
    380 /*
    381  * in_cksum_phdr:
    382  *
    383  *	Compute significant parts of the IPv4 checksum pseudo-header
    384  *	for use in a delayed TCP/UDP checksum calculation.
    385  *
    386  *	Args:
    387  *
    388  *		src		Source IP address
    389  *		dst		Destination IP address
    390  *		lenproto	htons(proto-hdr-len + proto-number)
    391  */
    392 static __inline u_int16_t __unused
    393 in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto)
    394 {
    395 	u_int32_t sum;
    396 
    397 	sum = lenproto +
    398 	      (u_int16_t)(src >> 16) +
    399 	      (u_int16_t)(src /*& 0xffff*/) +
    400 	      (u_int16_t)(dst >> 16) +
    401 	      (u_int16_t)(dst /*& 0xffff*/);
    402 
    403 	sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
    404 
    405 	if (sum > 0xffff)
    406 		sum -= 0xffff;
    407 
    408 	return (sum);
    409 }
    410 
    411 /*
    412  * in_cksum_addword:
    413  *
    414  *	Add the two 16-bit network-order values, carry, and return.
    415  */
    416 static __inline u_int16_t __unused
    417 in_cksum_addword(u_int16_t a, u_int16_t b)
    418 {
    419 	u_int32_t sum = a + b;
    420 
    421 	if (sum > 0xffff)
    422 		sum -= 0xffff;
    423 
    424 	return (sum);
    425 }
    426 
    427 extern	struct in_addr zeroin_addr;
    428 extern	u_char	ip_protox[];
    429 extern const struct sockaddr_in in_any;
    430 
    431 int	in_broadcast(struct in_addr, struct ifnet *);
    432 int	in_direct(struct in_addr, struct ifnet *);
    433 int	in_canforward(struct in_addr);
    434 int	cpu_in_cksum(struct mbuf *, int, int, uint32_t);
    435 int	in_cksum(struct mbuf *, int);
    436 int	in4_cksum(struct mbuf *, u_int8_t, int, int);
    437 int	in_localaddr(struct in_addr);
    438 void	in_socktrim(struct sockaddr_in *);
    439 
    440 void	in_len2mask(struct in_addr *, u_int);
    441 
    442 void	in_if_link_up(struct ifnet *);
    443 void	in_if_link_down(struct ifnet *);
    444 void	in_if_up(struct ifnet *);
    445 void	in_if_down(struct ifnet *);
    446 void	in_if_link_state_change(struct ifnet *, int);
    447 
    448 struct route;
    449 struct ip_moptions;
    450 
    451 struct in_ifaddr *in_selectsrc(struct sockaddr_in *,
    452 	struct route *, int, struct ip_moptions *, int *, struct psref *);
    453 
    454 struct ip;
    455 int in_tunnel_validate(const struct ip *, struct in_addr, struct in_addr);
    456 
    457 #define	in_hosteq(s,t)	((s).s_addr == (t).s_addr)
    458 #define	in_nullhost(x)	((x).s_addr == INADDR_ANY)
    459 
    460 #define	satosin(sa)	((struct sockaddr_in *)(sa))
    461 #define	satocsin(sa)	((const struct sockaddr_in *)(sa))
    462 #define	sintosa(sin)	((struct sockaddr *)(sin))
    463 #define	sintocsa(sin)	((const struct sockaddr *)(sin))
    464 #define	ifatoia(ifa)	((struct in_ifaddr *)(ifa))
    465 
    466 int sockaddr_in_cmp(const struct sockaddr *, const struct sockaddr *);
    467 const void *sockaddr_in_const_addr(const struct sockaddr *, socklen_t *);
    468 void *sockaddr_in_addr(struct sockaddr *, socklen_t *);
    469 
    470 static __inline void
    471 sockaddr_in_init1(struct sockaddr_in *sin, const struct in_addr *addr,
    472     in_port_t port)
    473 {
    474 	sin->sin_port = port;
    475 	sin->sin_addr = *addr;
    476 	memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
    477 }
    478 
    479 static __inline void
    480 sockaddr_in_init(struct sockaddr_in *sin, const struct in_addr *addr,
    481     in_port_t port)
    482 {
    483 	sin->sin_family = AF_INET;
    484 	sin->sin_len = sizeof(*sin);
    485 	sockaddr_in_init1(sin, addr, port);
    486 }
    487 
    488 static __inline struct sockaddr *
    489 sockaddr_in_alloc(const struct in_addr *addr, in_port_t port, int flags)
    490 {
    491 	struct sockaddr *sa;
    492 
    493 	sa = sockaddr_alloc(AF_INET, sizeof(struct sockaddr_in), flags);
    494 
    495 	if (sa == NULL)
    496 		return NULL;
    497 
    498 	sockaddr_in_init1(satosin(sa), addr, port);
    499 
    500 	return sa;
    501 }
    502 #endif /* _KERNEL */
    503 
    504 #if defined(_KERNEL) || defined(_TEST)
    505 int	in_print(char *, size_t, const struct in_addr *);
    506 #define IN_PRINT(b, a)	(in_print((b), sizeof(b), a), (b))
    507 int	sin_print(char *, size_t, const void *);
    508 #endif
    509 
    510 #endif /* !_NETINET_IN_H_ */
    511