ZG2100NetIfSource - ZG2100 Network interface source

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ZG2100 Network interface source

lwip/core/ipv4/ip_addr.c@1:3a7c15057192, 2010-08-06 (annotated)

Committer:: donatien
Date:: Fri Aug 06 10:23:41 2010 +0000
Revision:: 1:3a7c15057192
Parent:: 0:b802fc31f1db

Who changed what in which revision?

User	Revision	Line number	New contents of line
donatien	0:b802fc31f1db	1	/**
donatien	0:b802fc31f1db	2	* @file
donatien	0:b802fc31f1db	3	* This is the IPv4 address tools implementation.
donatien	0:b802fc31f1db	4	*
donatien	0:b802fc31f1db	5	*/
donatien	0:b802fc31f1db	6
donatien	0:b802fc31f1db	7	/*
donatien	0:b802fc31f1db	8	* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
donatien	0:b802fc31f1db	9	* All rights reserved.
donatien	0:b802fc31f1db	10	*
donatien	0:b802fc31f1db	11	* Redistribution and use in source and binary forms, with or without modification,
donatien	0:b802fc31f1db	12	* are permitted provided that the following conditions are met:
donatien	0:b802fc31f1db	13	*
donatien	0:b802fc31f1db	14	* 1. Redistributions of source code must retain the above copyright notice,
donatien	0:b802fc31f1db	15	* this list of conditions and the following disclaimer.
donatien	0:b802fc31f1db	16	* 2. Redistributions in binary form must reproduce the above copyright notice,
donatien	0:b802fc31f1db	17	* this list of conditions and the following disclaimer in the documentation
donatien	0:b802fc31f1db	18	* and/or other materials provided with the distribution.
donatien	0:b802fc31f1db	19	* 3. The name of the author may not be used to endorse or promote products
donatien	0:b802fc31f1db	20	* derived from this software without specific prior written permission.
donatien	0:b802fc31f1db	21	*
donatien	0:b802fc31f1db	22	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
donatien	0:b802fc31f1db	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
donatien	0:b802fc31f1db	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
donatien	0:b802fc31f1db	25	* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
donatien	0:b802fc31f1db	26	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
donatien	0:b802fc31f1db	27	* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
donatien	0:b802fc31f1db	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
donatien	0:b802fc31f1db	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
donatien	0:b802fc31f1db	30	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
donatien	0:b802fc31f1db	31	* OF SUCH DAMAGE.
donatien	0:b802fc31f1db	32	*
donatien	0:b802fc31f1db	33	* This file is part of the lwIP TCP/IP stack.
donatien	0:b802fc31f1db	34	*
donatien	0:b802fc31f1db	35	* Author: Adam Dunkels <adam@sics.se>
donatien	0:b802fc31f1db	36	*
donatien	0:b802fc31f1db	37	*/
donatien	0:b802fc31f1db	38
donatien	0:b802fc31f1db	39	#include "lwip/opt.h"
donatien	0:b802fc31f1db	40	#include "lwip/ip_addr.h"
donatien	0:b802fc31f1db	41	#include "lwip/netif.h"
donatien	0:b802fc31f1db	42
donatien	0:b802fc31f1db	43	/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
donatien	0:b802fc31f1db	44	const ip_addr_t ip_addr_any = { IPADDR_ANY };
donatien	0:b802fc31f1db	45	const ip_addr_t ip_addr_broadcast = { IPADDR_BROADCAST };
donatien	0:b802fc31f1db	46
donatien	0:b802fc31f1db	47	/**
donatien	0:b802fc31f1db	48	* Determine if an address is a broadcast address on a network interface
donatien	0:b802fc31f1db	49	*
donatien	0:b802fc31f1db	50	* @param addr address to be checked
donatien	0:b802fc31f1db	51	* @param netif the network interface against which the address is checked
donatien	0:b802fc31f1db	52	* @return returns non-zero if the address is a broadcast address
donatien	0:b802fc31f1db	53	*/
donatien	1:3a7c15057192	54	u8_t
donatien	1:3a7c15057192	55	ip4_addr_isbroadcast(u32_t addr, const struct netif *netif)
donatien	0:b802fc31f1db	56	{
donatien	1:3a7c15057192	57	ip_addr_t ipaddr;
donatien	1:3a7c15057192	58	ip4_addr_set_u32(&ipaddr, addr);
donatien	0:b802fc31f1db	59
donatien	0:b802fc31f1db	60	/* all ones (broadcast) or all zeroes (old skool broadcast) */
donatien	1:3a7c15057192	61	if ((~addr == IPADDR_ANY) \|\|
donatien	1:3a7c15057192	62	(addr == IPADDR_ANY)) {
donatien	0:b802fc31f1db	63	return 1;
donatien	0:b802fc31f1db	64	/* no broadcast support on this network interface? */
donatien	1:3a7c15057192	65	} else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
donatien	0:b802fc31f1db	66	/* the given address cannot be a broadcast address
donatien	0:b802fc31f1db	67	* nor can we check against any broadcast addresses */
donatien	0:b802fc31f1db	68	return 0;
donatien	0:b802fc31f1db	69	/* address matches network interface address exactly? => no broadcast */
donatien	1:3a7c15057192	70	} else if (addr == ip4_addr_get_u32(&netif->ip_addr)) {
donatien	0:b802fc31f1db	71	return 0;
donatien	0:b802fc31f1db	72	/* on the same (sub) network... */
donatien	1:3a7c15057192	73	} else if (ip_addr_netcmp(&ipaddr, &(netif->ip_addr), &(netif->netmask))
donatien	0:b802fc31f1db	74	/* ...and host identifier bits are all ones? =>... */
donatien	1:3a7c15057192	75	&& ((addr & ~ip4_addr_get_u32(&netif->netmask)) ==
donatien	1:3a7c15057192	76	(IPADDR_BROADCAST & ~ip4_addr_get_u32(&netif->netmask)))) {
donatien	0:b802fc31f1db	77	/* => network broadcast address */
donatien	0:b802fc31f1db	78	return 1;
donatien	1:3a7c15057192	79	} else {
donatien	0:b802fc31f1db	80	return 0;
donatien	1:3a7c15057192	81	}
donatien	1:3a7c15057192	82	}
donatien	1:3a7c15057192	83
donatien	1:3a7c15057192	84	/** Checks if a netmask is valid (starting with ones, then only zeros)
donatien	1:3a7c15057192	85	*
donatien	1:3a7c15057192	86	* @param netmask the IPv4 netmask to check (in network byte order!)
donatien	1:3a7c15057192	87	* @return 1 if the netmask is valid, 0 if it is not
donatien	1:3a7c15057192	88	*/
donatien	1:3a7c15057192	89	u8_t
donatien	1:3a7c15057192	90	ip4_addr_netmask_valid(u32_t netmask)
donatien	1:3a7c15057192	91	{
donatien	1:3a7c15057192	92	u32_t mask;
donatien	1:3a7c15057192	93	u32_t nm_hostorder = lwip_htonl(netmask);
donatien	1:3a7c15057192	94
donatien	1:3a7c15057192	95	/* first, check for the first zero */
donatien	1:3a7c15057192	96	for (mask = 1U << 31 ; mask != 0; mask >>= 1) {
donatien	1:3a7c15057192	97	if ((nm_hostorder & mask) == 0) {
donatien	1:3a7c15057192	98	break;
donatien	1:3a7c15057192	99	}
donatien	1:3a7c15057192	100	}
donatien	1:3a7c15057192	101	/* then check that there is no one */
donatien	1:3a7c15057192	102	for (; mask != 0; mask >>= 1) {
donatien	1:3a7c15057192	103	if ((nm_hostorder & mask) != 0) {
donatien	1:3a7c15057192	104	/* there is a one after the first zero -> invalid */
donatien	1:3a7c15057192	105	return 0;
donatien	1:3a7c15057192	106	}
donatien	1:3a7c15057192	107	}
donatien	1:3a7c15057192	108	/* no one after the first zero -> valid */
donatien	1:3a7c15057192	109	return 1;
donatien	0:b802fc31f1db	110	}
donatien	0:b802fc31f1db	111
donatien	0:b802fc31f1db	112	/* Here for now until needed in other places in lwIP */
donatien	0:b802fc31f1db	113	#ifndef isprint
donatien	0:b802fc31f1db	114	#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
donatien	0:b802fc31f1db	115	#define isprint(c) in_range(c, 0x20, 0x7f)
donatien	0:b802fc31f1db	116	#define isdigit(c) in_range(c, '0', '9')
donatien	0:b802fc31f1db	117	#define isxdigit(c) (isdigit(c) \|\| in_range(c, 'a', 'f') \|\| in_range(c, 'A', 'F'))
donatien	0:b802fc31f1db	118	#define islower(c) in_range(c, 'a', 'z')
donatien	0:b802fc31f1db	119	#define isspace(c) (c == ' ' \|\| c == '\f' \|\| c == '\n' \|\| c == '\r' \|\| c == '\t' \|\| c == '\v')
donatien	1:3a7c15057192	120	#endif
donatien	1:3a7c15057192	121
donatien	0:b802fc31f1db	122	/**
donatien	0:b802fc31f1db	123	* Ascii internet address interpretation routine.
donatien	0:b802fc31f1db	124	* The value returned is in network order.
donatien	0:b802fc31f1db	125	*
donatien	0:b802fc31f1db	126	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
donatien	0:b802fc31f1db	127	* @return ip address in network order
donatien	0:b802fc31f1db	128	*/
donatien	0:b802fc31f1db	129	u32_t
donatien	0:b802fc31f1db	130	ipaddr_addr(const char *cp)
donatien	0:b802fc31f1db	131	{
donatien	0:b802fc31f1db	132	ip_addr_t val;
donatien	0:b802fc31f1db	133
donatien	0:b802fc31f1db	134	if (ipaddr_aton(cp, &val)) {
donatien	0:b802fc31f1db	135	return ip4_addr_get_u32(&val);
donatien	0:b802fc31f1db	136	}
donatien	0:b802fc31f1db	137	return (IPADDR_NONE);
donatien	0:b802fc31f1db	138	}
donatien	0:b802fc31f1db	139
donatien	0:b802fc31f1db	140	/**
donatien	0:b802fc31f1db	141	* Check whether "cp" is a valid ascii representation
donatien	0:b802fc31f1db	142	* of an Internet address and convert to a binary address.
donatien	0:b802fc31f1db	143	* Returns 1 if the address is valid, 0 if not.
donatien	0:b802fc31f1db	144	* This replaces inet_addr, the return value from which
donatien	0:b802fc31f1db	145	* cannot distinguish between failure and a local broadcast address.
donatien	0:b802fc31f1db	146	*
donatien	0:b802fc31f1db	147	* @param cp IP address in ascii represenation (e.g. "127.0.0.1")
donatien	0:b802fc31f1db	148	* @param addr pointer to which to save the ip address in network order
donatien	0:b802fc31f1db	149	* @return 1 if cp could be converted to addr, 0 on failure
donatien	0:b802fc31f1db	150	*/
donatien	0:b802fc31f1db	151	int
donatien	0:b802fc31f1db	152	ipaddr_aton(const char cp, ip_addr_t addr)
donatien	0:b802fc31f1db	153	{
donatien	0:b802fc31f1db	154	u32_t val;
donatien	0:b802fc31f1db	155	u8_t base;
donatien	0:b802fc31f1db	156	char c;
donatien	0:b802fc31f1db	157	u32_t parts[4];
donatien	0:b802fc31f1db	158	u32_t *pp = parts;
donatien	0:b802fc31f1db	159
donatien	0:b802fc31f1db	160	c = *cp;
donatien	0:b802fc31f1db	161	for (;;) {
donatien	0:b802fc31f1db	162	/*
donatien	0:b802fc31f1db	163	* Collect number up to ``.''.
donatien	0:b802fc31f1db	164	* Values are specified as for C:
donatien	0:b802fc31f1db	165	* 0x=hex, 0=octal, 1-9=decimal.
donatien	0:b802fc31f1db	166	*/
donatien	0:b802fc31f1db	167	if (!isdigit(c))
donatien	0:b802fc31f1db	168	return (0);
donatien	0:b802fc31f1db	169	val = 0;
donatien	0:b802fc31f1db	170	base = 10;
donatien	0:b802fc31f1db	171	if (c == '0') {
donatien	0:b802fc31f1db	172	c = *++cp;
donatien	0:b802fc31f1db	173	if (c == 'x' \|\| c == 'X') {
donatien	0:b802fc31f1db	174	base = 16;
donatien	0:b802fc31f1db	175	c = *++cp;
donatien	0:b802fc31f1db	176	} else
donatien	0:b802fc31f1db	177	base = 8;
donatien	0:b802fc31f1db	178	}
donatien	0:b802fc31f1db	179	for (;;) {
donatien	0:b802fc31f1db	180	if (isdigit(c)) {
donatien	0:b802fc31f1db	181	val = (val * base) + (int)(c - '0');
donatien	0:b802fc31f1db	182	c = *++cp;
donatien	0:b802fc31f1db	183	} else if (base == 16 && isxdigit(c)) {
donatien	0:b802fc31f1db	184	val = (val << 4) \| (int)(c + 10 - (islower(c) ? 'a' : 'A'));
donatien	0:b802fc31f1db	185	c = *++cp;
donatien	0:b802fc31f1db	186	} else
donatien	0:b802fc31f1db	187	break;
donatien	0:b802fc31f1db	188	}
donatien	0:b802fc31f1db	189	if (c == '.') {
donatien	0:b802fc31f1db	190	/*
donatien	0:b802fc31f1db	191	* Internet format:
donatien	0:b802fc31f1db	192	* a.b.c.d
donatien	0:b802fc31f1db	193	* a.b.c (with c treated as 16 bits)
donatien	0:b802fc31f1db	194	* a.b (with b treated as 24 bits)
donatien	0:b802fc31f1db	195	*/
donatien	1:3a7c15057192	196	if (pp >= parts + 3) {
donatien	0:b802fc31f1db	197	return (0);
donatien	1:3a7c15057192	198	}
donatien	0:b802fc31f1db	199	*pp++ = val;
donatien	0:b802fc31f1db	200	c = *++cp;
donatien	0:b802fc31f1db	201	} else
donatien	0:b802fc31f1db	202	break;
donatien	0:b802fc31f1db	203	}
donatien	0:b802fc31f1db	204	/*
donatien	0:b802fc31f1db	205	* Check for trailing characters.
donatien	0:b802fc31f1db	206	*/
donatien	1:3a7c15057192	207	if (c != '\0' && !isspace(c)) {
donatien	0:b802fc31f1db	208	return (0);
donatien	1:3a7c15057192	209	}
donatien	0:b802fc31f1db	210	/*
donatien	0:b802fc31f1db	211	* Concoct the address according to
donatien	0:b802fc31f1db	212	* the number of parts specified.
donatien	0:b802fc31f1db	213	*/
donatien	0:b802fc31f1db	214	switch (pp - parts + 1) {
donatien	0:b802fc31f1db	215
donatien	0:b802fc31f1db	216	case 0:
donatien	0:b802fc31f1db	217	return (0); /* initial nondigit */
donatien	0:b802fc31f1db	218
donatien	0:b802fc31f1db	219	case 1: /* a -- 32 bits */
donatien	0:b802fc31f1db	220	break;
donatien	0:b802fc31f1db	221
donatien	0:b802fc31f1db	222	case 2: /* a.b -- 8.24 bits */
donatien	1:3a7c15057192	223	if (val > 0xffffffUL) {
donatien	0:b802fc31f1db	224	return (0);
donatien	1:3a7c15057192	225	}
donatien	0:b802fc31f1db	226	val \|= parts[0] << 24;
donatien	0:b802fc31f1db	227	break;
donatien	0:b802fc31f1db	228
donatien	0:b802fc31f1db	229	case 3: /* a.b.c -- 8.8.16 bits */
donatien	1:3a7c15057192	230	if (val > 0xffff) {
donatien	0:b802fc31f1db	231	return (0);
donatien	1:3a7c15057192	232	}
donatien	0:b802fc31f1db	233	val \|= (parts[0] << 24) \| (parts[1] << 16);
donatien	0:b802fc31f1db	234	break;
donatien	0:b802fc31f1db	235
donatien	0:b802fc31f1db	236	case 4: /* a.b.c.d -- 8.8.8.8 bits */
donatien	1:3a7c15057192	237	if (val > 0xff) {
donatien	0:b802fc31f1db	238	return (0);
donatien	1:3a7c15057192	239	}
donatien	0:b802fc31f1db	240	val \|= (parts[0] << 24) \| (parts[1] << 16) \| (parts[2] << 8);
donatien	0:b802fc31f1db	241	break;
donatien	1:3a7c15057192	242	default:
donatien	1:3a7c15057192	243	LWIP_ASSERT("unhandled", 0);
donatien	1:3a7c15057192	244	break;
donatien	0:b802fc31f1db	245	}
donatien	0:b802fc31f1db	246	if (addr) {
donatien	0:b802fc31f1db	247	ip4_addr_set_u32(addr, htonl(val));
donatien	0:b802fc31f1db	248	}
donatien	0:b802fc31f1db	249	return (1);
donatien	0:b802fc31f1db	250	}
donatien	0:b802fc31f1db	251
donatien	0:b802fc31f1db	252	/**
donatien	0:b802fc31f1db	253	* Convert numeric IP address into decimal dotted ASCII representation.
donatien	0:b802fc31f1db	254	* returns ptr to static buffer; not reentrant!
donatien	0:b802fc31f1db	255	*
donatien	0:b802fc31f1db	256	* @param addr ip address in network order to convert
donatien	0:b802fc31f1db	257	* @return pointer to a global static (!) buffer that holds the ASCII
donatien	0:b802fc31f1db	258	* represenation of addr
donatien	0:b802fc31f1db	259	*/
donatien	0:b802fc31f1db	260	char *
donatien	1:3a7c15057192	261	ipaddr_ntoa(const ip_addr_t *addr)
donatien	0:b802fc31f1db	262	{
donatien	0:b802fc31f1db	263	static char str[16];
donatien	0:b802fc31f1db	264	return ipaddr_ntoa_r(addr, str, 16);
donatien	0:b802fc31f1db	265	}
donatien	0:b802fc31f1db	266
donatien	0:b802fc31f1db	267	/**
donatien	0:b802fc31f1db	268	* Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
donatien	0:b802fc31f1db	269	*
donatien	0:b802fc31f1db	270	* @param addr ip address in network order to convert
donatien	0:b802fc31f1db	271	* @param buf target buffer where the string is stored
donatien	0:b802fc31f1db	272	* @param buflen length of buf
donatien	0:b802fc31f1db	273	* @return either pointer to buf which now holds the ASCII
donatien	0:b802fc31f1db	274	* representation of addr or NULL if buf was too small
donatien	0:b802fc31f1db	275	*/
donatien	1:3a7c15057192	276	char ipaddr_ntoa_r(const ip_addr_t addr, char *buf, int buflen)
donatien	0:b802fc31f1db	277	{
donatien	0:b802fc31f1db	278	u32_t s_addr;
donatien	0:b802fc31f1db	279	char inv[3];
donatien	0:b802fc31f1db	280	char *rp;
donatien	0:b802fc31f1db	281	u8_t *ap;
donatien	0:b802fc31f1db	282	u8_t rem;
donatien	0:b802fc31f1db	283	u8_t n;
donatien	0:b802fc31f1db	284	u8_t i;
donatien	0:b802fc31f1db	285	int len = 0;
donatien	0:b802fc31f1db	286
donatien	0:b802fc31f1db	287	s_addr = ip4_addr_get_u32(addr);
donatien	0:b802fc31f1db	288
donatien	0:b802fc31f1db	289	rp = buf;
donatien	0:b802fc31f1db	290	ap = (u8_t *)&s_addr;
donatien	0:b802fc31f1db	291	for(n = 0; n < 4; n++) {
donatien	0:b802fc31f1db	292	i = 0;
donatien	0:b802fc31f1db	293	do {
donatien	0:b802fc31f1db	294	rem = *ap % (u8_t)10;
donatien	0:b802fc31f1db	295	*ap /= (u8_t)10;
donatien	0:b802fc31f1db	296	inv[i++] = '0' + rem;
donatien	0:b802fc31f1db	297	} while(*ap);
donatien	0:b802fc31f1db	298	while(i--) {
donatien	0:b802fc31f1db	299	if (len++ >= buflen) {
donatien	0:b802fc31f1db	300	return NULL;
donatien	0:b802fc31f1db	301	}
donatien	0:b802fc31f1db	302	*rp++ = inv[i];
donatien	0:b802fc31f1db	303	}
donatien	0:b802fc31f1db	304	if (len++ >= buflen) {
donatien	0:b802fc31f1db	305	return NULL;
donatien	0:b802fc31f1db	306	}
donatien	0:b802fc31f1db	307	*rp++ = '.';
donatien	0:b802fc31f1db	308	ap++;
donatien	0:b802fc31f1db	309	}
donatien	0:b802fc31f1db	310	*--rp = 0;
donatien	0:b802fc31f1db	311	return buf;
donatien	0:b802fc31f1db	312	}

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Type:	Program
Created:	09 Jul 2010
Imports:	20
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	3

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lwip/core/ipv4/ip_addr.c@1:3a7c15057192, 2010-08-06 (annotated)

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