1/* $NetBSD: in.h,v 1.99 2016/08/01 03:15:30 ozaki-r 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 uint8_t
46typedef __uint8_t uint8_t;
47#define uint8_t __uint8_t
48#endif
49
50#ifndef uint32_t
51typedef __uint32_t uint32_t;
52#define uint32_t __uint32_t
53#endif
54
55#include <sys/ansi.h>
56
57#ifndef in_addr_t
58typedef __in_addr_t in_addr_t;
59#define in_addr_t __in_addr_t
60#endif
61
62#ifndef in_port_t
63typedef __in_port_t in_port_t;
64#define in_port_t __in_port_t
65#endif
66
67#ifndef sa_family_t
68typedef __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_SCTP 132 /* SCTP */
109#define IPPROTO_PFSYNC 240 /* PFSYNC */
110#define IPPROTO_RAW 255 /* raw IP packet */
111#define IPPROTO_MAX 256
112
113/* last return value of *_input(), meaning "all job for this pkt is done". */
114#define IPPROTO_DONE 257
115
116/* sysctl placeholder for (FAST_)IPSEC */
117#define CTL_IPPROTO_IPSEC 258
118
119
120/*
121 * Local port number conventions:
122 *
123 * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
124 * unless a kernel is compiled with IPNOPRIVPORTS defined.
125 *
126 * When a user does a bind(2) or connect(2) with a port number of zero,
127 * a non-conflicting local port address is chosen.
128 *
129 * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
130 * that is settable by sysctl(3); net.inet.ip.anonportmin and
131 * net.inet.ip.anonportmax respectively.
132 *
133 * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
134 * default assignment range.
135 *
136 * The value IP_PORTRANGE_DEFAULT causes the default behavior.
137 *
138 * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
139 * and exists only for FreeBSD compatibility purposes.
140 *
141 * The value IP_PORTRANGE_LOW changes the range to the "low" are
142 * that is (by convention) restricted to privileged processes.
143 * This convention is based on "vouchsafe" principles only.
144 * It is only secure if you trust the remote host to restrict these ports.
145 * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
146 */
147
148#define IPPORT_RESERVED 1024
149#define IPPORT_ANONMIN 49152
150#define IPPORT_ANONMAX 65535
151#define IPPORT_RESERVEDMIN 600
152#define IPPORT_RESERVEDMAX (IPPORT_RESERVED-1)
153
154/*
155 * Internet address (a structure for historical reasons)
156 */
157struct in_addr {
158 in_addr_t s_addr;
159} __packed;
160
161/*
162 * Definitions of bits in internet address integers.
163 * On subnets, the decomposition of addresses to host and net parts
164 * is done according to subnet mask, not the masks here.
165 *
166 * By byte-swapping the constants, we avoid ever having to byte-swap IP
167 * addresses inside the kernel. Unfortunately, user-level programs rely
168 * on these macros not doing byte-swapping.
169 */
170#ifdef _KERNEL
171#define __IPADDR(x) ((uint32_t) htonl((uint32_t)(x)))
172#else
173#define __IPADDR(x) ((uint32_t)(x))
174#endif
175
176#define IN_CLASSA(i) (((uint32_t)(i) & __IPADDR(0x80000000)) == \
177 __IPADDR(0x00000000))
178#define IN_CLASSA_NET __IPADDR(0xff000000)
179#define IN_CLASSA_NSHIFT 24
180#define IN_CLASSA_HOST __IPADDR(0x00ffffff)
181#define IN_CLASSA_MAX 128
182
183#define IN_CLASSB(i) (((uint32_t)(i) & __IPADDR(0xc0000000)) == \
184 __IPADDR(0x80000000))
185#define IN_CLASSB_NET __IPADDR(0xffff0000)
186#define IN_CLASSB_NSHIFT 16
187#define IN_CLASSB_HOST __IPADDR(0x0000ffff)
188#define IN_CLASSB_MAX 65536
189
190#define IN_CLASSC(i) (((uint32_t)(i) & __IPADDR(0xe0000000)) == \
191 __IPADDR(0xc0000000))
192#define IN_CLASSC_NET __IPADDR(0xffffff00)
193#define IN_CLASSC_NSHIFT 8
194#define IN_CLASSC_HOST __IPADDR(0x000000ff)
195
196#define IN_CLASSD(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
197 __IPADDR(0xe0000000))
198/* These ones aren't really net and host fields, but routing needn't know. */
199#define IN_CLASSD_NET __IPADDR(0xf0000000)
200#define IN_CLASSD_NSHIFT 28
201#define IN_CLASSD_HOST __IPADDR(0x0fffffff)
202#define IN_MULTICAST(i) IN_CLASSD(i)
203
204#define IN_EXPERIMENTAL(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
205 __IPADDR(0xf0000000))
206#define IN_BADCLASS(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
207 __IPADDR(0xf0000000))
208
209#define IN_LINKLOCAL(i) (((uint32_t)(i) & __IPADDR(0xffff0000)) == \
210 __IPADDR(0xa9fe0000))
211
212#define IN_PRIVATE(i) ((((uint32_t)(i) & __IPADDR(0xff000000)) == \
213 __IPADDR(0x0a000000)) || \
214 (((uint32_t)(i) & __IPADDR(0xfff00000)) == \
215 __IPADDR(0xac100000)) || \
216 (((uint32_t)(i) & __IPADDR(0xffff0000)) == \
217 __IPADDR(0xc0a80000)))
218
219#define IN_LOCAL_GROUP(i) (((uint32_t)(i) & __IPADDR(0xffffff00)) == \
220 __IPADDR(0xe0000000))
221
222#define IN_ANY_LOCAL(i) (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
223
224#define INADDR_ANY __IPADDR(0x00000000)
225#define INADDR_LOOPBACK __IPADDR(0x7f000001)
226#define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */
227#define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */
228
229#define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */
230#define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */
231#define INADDR_ALLRTRS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */
232#define INADDR_CARP_GROUP __IPADDR(0xe0000012) /* 224.0.0.18 */
233#define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */
234
235#define IN_LOOPBACKNET 127 /* official! */
236
237/*
238 * Socket address, internet style.
239 */
240struct sockaddr_in {
241 uint8_t sin_len;
242 sa_family_t sin_family;
243 in_port_t sin_port;
244 struct in_addr sin_addr;
245 __int8_t sin_zero[8];
246};
247
248#define INET_ADDRSTRLEN 16
249
250/*
251 * Structure used to describe IP options.
252 * Used to store options internally, to pass them to a process,
253 * or to restore options retrieved earlier.
254 * The ip_dst is used for the first-hop gateway when using a source route
255 * (this gets put into the header proper).
256 */
257struct ip_opts {
258 struct in_addr ip_dst; /* first hop, 0 w/o src rt */
259#if defined(__cplusplus)
260 __int8_t Ip_opts[40]; /* actually variable in size */
261#else
262 __int8_t ip_opts[40]; /* actually variable in size */
263#endif
264};
265
266/*
267 * Options for use with [gs]etsockopt at the IP level.
268 * First word of comment is data type; bool is stored in int.
269 */
270#define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */
271#define IP_HDRINCL 2 /* int; header is included with data */
272#define IP_TOS 3 /* int; IP type of service and preced. */
273#define IP_TTL 4 /* int; IP time to live */
274#define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */
275#define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */
276#define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */
277#define IP_RETOPTS 8 /* ip_opts; set/get IP options */
278#define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */
279#define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */
280#define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */
281/* The add and drop membership option numbers need to match with the v6 ones */
282#define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */
283#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */
284#define IP_PORTALGO 18 /* int; port selection algo (rfc6056) */
285#define IP_PORTRANGE 19 /* int; range to use for ephemeral port */
286#define IP_RECVIF 20 /* bool; receive reception if w/dgram */
287#define IP_ERRORMTU 21 /* int; get MTU of last xmit = EMSGSIZE */
288#define IP_IPSEC_POLICY 22 /* struct; get/set security policy */
289#define IP_RECVTTL 23 /* bool; receive IP TTL w/dgram */
290#define IP_MINTTL 24 /* minimum TTL for packet or drop */
291#define IP_PKTINFO 25 /* int; send interface and src addr */
292#define IP_RECVPKTINFO 26 /* int; send interface and dst addr */
293
294/*
295 * Information sent in the control message of a datagram socket for
296 * IP_PKTINFO and IP_RECVPKTINFO.
297 */
298struct in_pktinfo {
299 struct in_addr ipi_addr; /* src/dst address */
300 unsigned int ipi_ifindex; /* interface index */
301};
302
303/*
304 * Defaults and limits for options
305 */
306#define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */
307#define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */
308#define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */
309
310/*
311 * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
312 */
313struct ip_mreq {
314 struct in_addr imr_multiaddr; /* IP multicast address of group */
315 struct in_addr imr_interface; /* local IP address of interface */
316};
317
318/*
319 * Argument for IP_PORTRANGE:
320 * - which range to search when port is unspecified at bind() or connect()
321 */
322#define IP_PORTRANGE_DEFAULT 0 /* default range */
323#define IP_PORTRANGE_HIGH 1 /* same as DEFAULT (FreeBSD compat) */
324#define IP_PORTRANGE_LOW 2 /* use privileged range */
325
326#if defined(_NETBSD_SOURCE)
327/*
328 * Definitions for inet sysctl operations.
329 *
330 * Third level is protocol number.
331 * Fourth level is desired variable within that protocol.
332 */
333#define IPPROTO_MAXID (IPPROTO_AH + 1) /* don't list to IPPROTO_MAX */
334
335#define CTL_IPPROTO_NAMES { \
336 { "ip", CTLTYPE_NODE }, \
337 { "icmp", CTLTYPE_NODE }, \
338 { "igmp", CTLTYPE_NODE }, \
339 { "ggp", CTLTYPE_NODE }, \
340 { 0, 0 }, \
341 { 0, 0 }, \
342 { "tcp", CTLTYPE_NODE }, \
343 { 0, 0 }, \
344 { "egp", CTLTYPE_NODE }, \
345 { 0, 0 }, \
346 { 0, 0 }, \
347 { 0, 0 }, \
348 { "pup", CTLTYPE_NODE }, \
349 { 0, 0 }, \
350 { 0, 0 }, \
351 { 0, 0 }, \
352 { 0, 0 }, \
353 { "udp", CTLTYPE_NODE }, \
354 { 0, 0 }, \
355 { 0, 0 }, \
356 { 0, 0 }, \
357 { 0, 0 }, \
358 { "idp", CTLTYPE_NODE }, \
359 { 0, 0 }, \
360 { 0, 0 }, \
361 { 0, 0 }, \
362 { 0, 0 }, \
363 { 0, 0 }, \
364 { 0, 0 }, \
365 { 0, 0 }, \
366 { 0, 0 }, \
367 { 0, 0 }, \
368 { 0, 0 }, \
369 { 0, 0 }, \
370 { 0, 0 }, \
371 { 0, 0 }, \
372 { 0, 0 }, \
373 { 0, 0 }, \
374 { 0, 0 }, \
375 { 0, 0 }, \
376 { 0, 0 }, \
377 { 0, 0 }, \
378 { 0, 0 }, \
379 { 0, 0 }, \
380 { 0, 0 }, \
381 { 0, 0 }, \
382 { 0, 0 }, \
383 { 0, 0 }, \
384 { 0, 0 }, \
385 { 0, 0 }, \
386 { 0, 0 }, \
387 { "ipsec", CTLTYPE_NODE }, \
388 { 0, 0 }, \
389 { 0, 0 }, \
390 { 0, 0 }, \
391 { 0, 0 }, \
392 { 0, 0 }, \
393 { 0, 0 }, \
394 { 0, 0 }, \
395 { 0, 0 }, \
396 { 0, 0 }, \
397 { 0, 0 }, \
398 { 0, 0 }, \
399 { 0, 0 }, \
400 { 0, 0 }, \
401 { 0, 0 }, \
402 { 0, 0 }, \
403 { 0, 0 }, \
404 { 0, 0 }, \
405 { 0, 0 }, \
406 { 0, 0 }, \
407 { 0, 0 }, \
408 { 0, 0 }, \
409 { 0, 0 }, \
410 { 0, 0 }, \
411 { 0, 0 }, \
412 { 0, 0 }, \
413 { 0, 0 }, \
414 { 0, 0 }, \
415 { 0, 0 }, \
416 { 0, 0 }, \
417 { 0, 0 }, \
418 { 0, 0 }, \
419 { 0, 0 }, \
420 { 0, 0 }, \
421 { 0, 0 }, \
422 { 0, 0 }, \
423 { 0, 0 }, \
424 { 0, 0 }, \
425 { 0, 0 }, \
426 { 0, 0 }, \
427 { 0, 0 }, \
428 { 0, 0 }, \
429 { 0, 0 }, \
430 { 0, 0 }, \
431 { 0, 0 }, \
432 { 0, 0 }, \
433 { 0, 0 }, \
434 { 0, 0 }, \
435 { 0, 0 }, \
436 { 0, 0 }, \
437 { 0, 0 }, \
438 { 0, 0 }, \
439 { "pim", CTLTYPE_NODE }, \
440}
441
442/*
443 * Names for IP sysctl objects
444 */
445#define IPCTL_FORWARDING 1 /* act as router */
446#define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */
447#define IPCTL_DEFTTL 3 /* default TTL */
448#ifdef notyet
449#define IPCTL_DEFMTU 4 /* default MTU */
450#endif
451#define IPCTL_FORWSRCRT 5 /* forward source-routed packets */
452#define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */
453#define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */
454#define IPCTL_SUBNETSARELOCAL 8 /* treat subnets as local addresses */
455#define IPCTL_MTUDISC 9 /* allow path MTU discovery */
456#define IPCTL_ANONPORTMIN 10 /* minimum ephemeral port */
457#define IPCTL_ANONPORTMAX 11 /* maximum ephemeral port */
458#define IPCTL_MTUDISCTIMEOUT 12 /* allow path MTU discovery */
459#define IPCTL_MAXFLOWS 13 /* maximum ip flows allowed */
460#define IPCTL_HOSTZEROBROADCAST 14 /* is host zero a broadcast addr? */
461#define IPCTL_GIF_TTL 15 /* default TTL for gif encap packet */
462#define IPCTL_LOWPORTMIN 16 /* minimum reserved port */
463#define IPCTL_LOWPORTMAX 17 /* maximum reserved port */
464#define IPCTL_MAXFRAGPACKETS 18 /* max packets reassembly queue */
465#define IPCTL_GRE_TTL 19 /* default TTL for gre encap packet */
466#define IPCTL_CHECKINTERFACE 20 /* drop pkts in from 'wrong' iface */
467#define IPCTL_IFQ 21 /* IP packet input queue */
468#define IPCTL_RANDOMID 22 /* use random IP ids (if configured) */
469#define IPCTL_LOOPBACKCKSUM 23 /* do IP checksum on loopback */
470#define IPCTL_STATS 24 /* IP statistics */
471#define IPCTL_DAD_COUNT 25 /* DAD packets to send */
472#define IPCTL_MAXID 26
473
474#define IPCTL_NAMES { \
475 { 0, 0 }, \
476 { "forwarding", CTLTYPE_INT }, \
477 { "redirect", CTLTYPE_INT }, \
478 { "ttl", CTLTYPE_INT }, \
479 { "mtu", CTLTYPE_INT }, \
480 { "forwsrcrt", CTLTYPE_INT }, \
481 { "directed-broadcast", CTLTYPE_INT }, \
482 { "allowsrcrt", CTLTYPE_INT }, \
483 { "subnetsarelocal", CTLTYPE_INT }, \
484 { "mtudisc", CTLTYPE_INT }, \
485 { "anonportmin", CTLTYPE_INT }, \
486 { "anonportmax", CTLTYPE_INT }, \
487 { "mtudisctimeout", CTLTYPE_INT }, \
488 { "maxflows", CTLTYPE_INT }, \
489 { "hostzerobroadcast", CTLTYPE_INT }, \
490 { "gifttl", CTLTYPE_INT }, \
491 { "lowportmin", CTLTYPE_INT }, \
492 { "lowportmax", CTLTYPE_INT }, \
493 { "maxfragpackets", CTLTYPE_INT }, \
494 { "grettl", CTLTYPE_INT }, \
495 { "checkinterface", CTLTYPE_INT }, \
496 { "ifq", CTLTYPE_NODE }, \
497 { "random_id", CTLTYPE_INT }, \
498 { "do_loopback_cksum", CTLTYPE_INT }, \
499 { "stats", CTLTYPE_STRUCT }, \
500 { "dad_count", CTLTYPE_INT }, \
501}
502#endif /* _NETBSD_SOURCE */
503
504/* INET6 stuff */
505#define __KAME_NETINET_IN_H_INCLUDED_
506#include <netinet6/in6.h>
507#undef __KAME_NETINET_IN_H_INCLUDED_
508
509#ifdef _KERNEL
510#include <sys/psref.h>
511
512/*
513 * in_cksum_phdr:
514 *
515 * Compute significant parts of the IPv4 checksum pseudo-header
516 * for use in a delayed TCP/UDP checksum calculation.
517 *
518 * Args:
519 *
520 * src Source IP address
521 * dst Destination IP address
522 * lenproto htons(proto-hdr-len + proto-number)
523 */
524static __inline u_int16_t __unused
525in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto)
526{
527 u_int32_t sum;
528
529 sum = lenproto +
530 (u_int16_t)(src >> 16) +
531 (u_int16_t)(src /*& 0xffff*/) +
532 (u_int16_t)(dst >> 16) +
533 (u_int16_t)(dst /*& 0xffff*/);
534
535 sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
536
537 if (sum > 0xffff)
538 sum -= 0xffff;
539
540 return (sum);
541}
542
543/*
544 * in_cksum_addword:
545 *
546 * Add the two 16-bit network-order values, carry, and return.
547 */
548static __inline u_int16_t __unused
549in_cksum_addword(u_int16_t a, u_int16_t b)
550{
551 u_int32_t sum = a + b;
552
553 if (sum > 0xffff)
554 sum -= 0xffff;
555
556 return (sum);
557}
558
559extern struct in_addr zeroin_addr;
560extern u_char ip_protox[];
561extern const struct sockaddr_in in_any;
562
563int in_broadcast(struct in_addr, struct ifnet *);
564int in_canforward(struct in_addr);
565int cpu_in_cksum(struct mbuf *, int, int, uint32_t);
566int in_cksum(struct mbuf *, int);
567int in4_cksum(struct mbuf *, u_int8_t, int, int);
568void in_delayed_cksum(struct mbuf *);
569int in_localaddr(struct in_addr);
570void in_socktrim(struct sockaddr_in *);
571
572void in_if_link_up(struct ifnet *);
573void in_if_link_down(struct ifnet *);
574void in_if_up(struct ifnet *);
575void in_if_down(struct ifnet *);
576void in_if_link_state_change(struct ifnet *, int);
577
578struct route;
579struct ip_moptions;
580
581struct in_ifaddr *in_selectsrc(struct sockaddr_in *,
582 struct route *, int, struct ip_moptions *, int *, struct psref *);
583
584#define in_hosteq(s,t) ((s).s_addr == (t).s_addr)
585#define in_nullhost(x) ((x).s_addr == INADDR_ANY)
586
587#define satosin(sa) ((struct sockaddr_in *)(sa))
588#define satocsin(sa) ((const struct sockaddr_in *)(sa))
589#define sintosa(sin) ((struct sockaddr *)(sin))
590#define sintocsa(sin) ((const struct sockaddr *)(sin))
591#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
592
593int sockaddr_in_cmp(const struct sockaddr *, const struct sockaddr *);
594const void *sockaddr_in_const_addr(const struct sockaddr *, socklen_t *);
595void *sockaddr_in_addr(struct sockaddr *, socklen_t *);
596
597static inline void
598sockaddr_in_init1(struct sockaddr_in *sin, const struct in_addr *addr,
599 in_port_t port)
600{
601 sin->sin_port = port;
602 sin->sin_addr = *addr;
603 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
604}
605
606static inline void
607sockaddr_in_init(struct sockaddr_in *sin, const struct in_addr *addr,
608 in_port_t port)
609{
610 sin->sin_family = AF_INET;
611 sin->sin_len = sizeof(*sin);
612 sockaddr_in_init1(sin, addr, port);
613}
614
615static inline struct sockaddr *
616sockaddr_in_alloc(const struct in_addr *addr, in_port_t port, int flags)
617{
618 struct sockaddr *sa;
619
620 sa = sockaddr_alloc(AF_INET, sizeof(struct sockaddr_in), flags);
621
622 if (sa == NULL)
623 return NULL;
624
625 sockaddr_in_init1(satosin(sa), addr, port);
626
627 return sa;
628}
629#endif /* _KERNEL */
630
631#if defined(_KERNEL) || defined(_TEST)
632int in_print(char *, size_t, const struct in_addr *);
633#define IN_PRINT(b, a) (in_print((b), sizeof(b), a), (b))
634int sin_print(char *, size_t, const void *);
635#endif
636
637#endif /* !_NETINET_IN_H_ */
638