Mistake on this page?
Report an issue in GitHub or email us
ip4_addr.h
Go to the documentation of this file.
1 /**
2  * @file
3  * IPv4 address API
4  */
5 
6 /*
7  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without modification,
11  * are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright notice,
14  * this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  * 3. The name of the author may not be used to endorse or promote products
19  * derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
30  * OF SUCH DAMAGE.
31  *
32  * This file is part of the lwIP TCP/IP stack.
33  *
34  * Author: Adam Dunkels <adam@sics.se>
35  *
36  */
37 #ifndef LWIP_HDR_IP4_ADDR_H
38 #define LWIP_HDR_IP4_ADDR_H
39 
40 #include "lwip/opt.h"
41 #include "lwip/def.h"
42 
43 #if LWIP_IPV4
44 
45 #ifdef __cplusplus
46 extern "C" {
47 #endif
48 
49 /** This is the aligned version of ip4_addr_t,
50  used as local variable, on the stack, etc. */
51 struct ip4_addr {
52  u32_t addr;
53 };
54 
55 /** ip4_addr_t uses a struct for convenience only, so that the same defines can
56  * operate both on ip4_addr_t as well as on ip4_addr_p_t. */
57 typedef struct ip4_addr ip4_addr_t;
58 
59 /* Forward declaration to not include netif.h */
60 struct netif;
61 
62 /** 255.255.255.255 */
63 #define IPADDR_NONE ((u32_t)0xffffffffUL)
64 /** 127.0.0.1 */
65 #define IPADDR_LOOPBACK ((u32_t)0x7f000001UL)
66 /** 0.0.0.0 */
67 #define IPADDR_ANY ((u32_t)0x00000000UL)
68 /** 255.255.255.255 */
69 #define IPADDR_BROADCAST ((u32_t)0xffffffffUL)
70 
71 /* Definitions of the bits in an Internet address integer.
72 
73  On subnets, host and network parts are found according to
74  the subnet mask, not these masks. */
75 #define IP_CLASSA(a) ((((u32_t)(a)) & 0x80000000UL) == 0)
76 #define IP_CLASSA_NET 0xff000000
77 #define IP_CLASSA_NSHIFT 24
78 #define IP_CLASSA_HOST (0xffffffff & ~IP_CLASSA_NET)
79 #define IP_CLASSA_MAX 128
80 
81 #define IP_CLASSB(a) ((((u32_t)(a)) & 0xc0000000UL) == 0x80000000UL)
82 #define IP_CLASSB_NET 0xffff0000
83 #define IP_CLASSB_NSHIFT 16
84 #define IP_CLASSB_HOST (0xffffffff & ~IP_CLASSB_NET)
85 #define IP_CLASSB_MAX 65536
86 
87 #define IP_CLASSC(a) ((((u32_t)(a)) & 0xe0000000UL) == 0xc0000000UL)
88 #define IP_CLASSC_NET 0xffffff00
89 #define IP_CLASSC_NSHIFT 8
90 #define IP_CLASSC_HOST (0xffffffff & ~IP_CLASSC_NET)
91 
92 #define IP_CLASSD(a) (((u32_t)(a) & 0xf0000000UL) == 0xe0000000UL)
93 #define IP_CLASSD_NET 0xf0000000 /* These ones aren't really */
94 #define IP_CLASSD_NSHIFT 28 /* net and host fields, but */
95 #define IP_CLASSD_HOST 0x0fffffff /* routing needn't know. */
96 #define IP_MULTICAST(a) IP_CLASSD(a)
97 
98 #define IP_EXPERIMENTAL(a) (((u32_t)(a) & 0xf0000000UL) == 0xf0000000UL)
99 #define IP_BADCLASS(a) (((u32_t)(a) & 0xf0000000UL) == 0xf0000000UL)
100 
101 #define IP_LOOPBACKNET 127 /* official! */
102 
103 /** Set an IP address given by the four byte-parts */
104 #define IP4_ADDR(ipaddr, a,b,c,d) (ipaddr)->addr = PP_HTONL(LWIP_MAKEU32(a,b,c,d))
105 
106 /** Copy IP address - faster than ip4_addr_set: no NULL check */
107 #define ip4_addr_copy(dest, src) ((dest).addr = (src).addr)
108 /** Safely copy one IP address to another (src may be NULL) */
109 #define ip4_addr_set(dest, src) ((dest)->addr = \
110  ((src) == NULL ? 0 : \
111  (src)->addr))
112 /** Set complete address to zero */
113 #define ip4_addr_set_zero(ipaddr) ((ipaddr)->addr = 0)
114 /** Set address to IPADDR_ANY (no need for lwip_htonl()) */
115 #define ip4_addr_set_any(ipaddr) ((ipaddr)->addr = IPADDR_ANY)
116 /** Set address to loopback address */
117 #define ip4_addr_set_loopback(ipaddr) ((ipaddr)->addr = PP_HTONL(IPADDR_LOOPBACK))
118 /** Check if an address is in the loopback region */
119 #define ip4_addr_isloopback(ipaddr) (((ipaddr)->addr & PP_HTONL(IP_CLASSA_NET)) == PP_HTONL(((u32_t)IP_LOOPBACKNET) << 24))
120 /** Safely copy one IP address to another and change byte order
121  * from host- to network-order. */
122 #define ip4_addr_set_hton(dest, src) ((dest)->addr = \
123  ((src) == NULL ? 0:\
124  lwip_htonl((src)->addr)))
125 /** IPv4 only: set the IP address given as an u32_t */
126 #define ip4_addr_set_u32(dest_ipaddr, src_u32) ((dest_ipaddr)->addr = (src_u32))
127 /** IPv4 only: get the IP address as an u32_t */
128 #define ip4_addr_get_u32(src_ipaddr) ((src_ipaddr)->addr)
129 
130 /** Get the network address by combining host address with netmask */
131 #define ip4_addr_get_network(target, host, netmask) do { ((target)->addr = ((host)->addr) & ((netmask)->addr)); } while(0)
132 
133 /**
134  * Determine if two address are on the same network.
135  *
136  * @arg addr1 IP address 1
137  * @arg addr2 IP address 2
138  * @arg mask network identifier mask
139  * @return !0 if the network identifiers of both address match
140  */
141 #define ip4_addr_netcmp(addr1, addr2, mask) (((addr1)->addr & \
142  (mask)->addr) == \
143  ((addr2)->addr & \
144  (mask)->addr))
145 #define ip4_addr_cmp(addr1, addr2) ((addr1)->addr == (addr2)->addr)
146 
147 #define ip4_addr_isany_val(addr1) ((addr1).addr == IPADDR_ANY)
148 #define ip4_addr_isany(addr1) ((addr1) == NULL || ip4_addr_isany_val(*(addr1)))
149 
150 #define ip4_addr_isbroadcast(addr1, netif) ip4_addr_isbroadcast_u32((addr1)->addr, netif)
151 u8_t ip4_addr_isbroadcast_u32(u32_t addr, const struct netif *netif);
152 
153 #define ip_addr_netmask_valid(netmask) ip4_addr_netmask_valid((netmask)->addr)
154 u8_t ip4_addr_netmask_valid(u32_t netmask);
155 
156 #define ip4_addr_ismulticast(addr1) (((addr1)->addr & PP_HTONL(0xf0000000UL)) == PP_HTONL(0xe0000000UL))
157 
158 #define ip4_addr_islinklocal(addr1) (((addr1)->addr & PP_HTONL(0xffff0000UL)) == PP_HTONL(0xa9fe0000UL))
159 
160 #define ip4_addr_debug_print_parts(debug, a, b, c, d) \
161  LWIP_DEBUGF(debug, ("%" U16_F ".%" U16_F ".%" U16_F ".%" U16_F, a, b, c, d))
162 #define ip4_addr_debug_print(debug, ipaddr) \
163  ip4_addr_debug_print_parts(debug, \
164  (u16_t)((ipaddr) != NULL ? ip4_addr1_16(ipaddr) : 0), \
165  (u16_t)((ipaddr) != NULL ? ip4_addr2_16(ipaddr) : 0), \
166  (u16_t)((ipaddr) != NULL ? ip4_addr3_16(ipaddr) : 0), \
167  (u16_t)((ipaddr) != NULL ? ip4_addr4_16(ipaddr) : 0))
168 #define ip4_addr_debug_print_val(debug, ipaddr) \
169  ip4_addr_debug_print_parts(debug, \
170  ip4_addr1_16_val(ipaddr), \
171  ip4_addr2_16_val(ipaddr), \
172  ip4_addr3_16_val(ipaddr), \
173  ip4_addr4_16_val(ipaddr))
174 
175 /* Get one byte from the 4-byte address */
176 #define ip4_addr_get_byte(ipaddr, idx) (((const u8_t*)(&(ipaddr)->addr))[idx])
177 #define ip4_addr1(ipaddr) ip4_addr_get_byte(ipaddr, 0)
178 #define ip4_addr2(ipaddr) ip4_addr_get_byte(ipaddr, 1)
179 #define ip4_addr3(ipaddr) ip4_addr_get_byte(ipaddr, 2)
180 #define ip4_addr4(ipaddr) ip4_addr_get_byte(ipaddr, 3)
181 /* Get one byte from the 4-byte address, but argument is 'ip4_addr_t',
182  * not a pointer */
183 #define ip4_addr_get_byte_val(ipaddr, idx) ((u8_t)(((ipaddr).addr >> (idx * 8)) & 0xff))
184 #define ip4_addr1_val(ipaddr) ip4_addr_get_byte_val(ipaddr, 0)
185 #define ip4_addr2_val(ipaddr) ip4_addr_get_byte_val(ipaddr, 1)
186 #define ip4_addr3_val(ipaddr) ip4_addr_get_byte_val(ipaddr, 2)
187 #define ip4_addr4_val(ipaddr) ip4_addr_get_byte_val(ipaddr, 3)
188 /* These are cast to u16_t, with the intent that they are often arguments
189  * to printf using the U16_F format from cc.h. */
190 #define ip4_addr1_16(ipaddr) ((u16_t)ip4_addr1(ipaddr))
191 #define ip4_addr2_16(ipaddr) ((u16_t)ip4_addr2(ipaddr))
192 #define ip4_addr3_16(ipaddr) ((u16_t)ip4_addr3(ipaddr))
193 #define ip4_addr4_16(ipaddr) ((u16_t)ip4_addr4(ipaddr))
194 #define ip4_addr1_16_val(ipaddr) ((u16_t)ip4_addr1_val(ipaddr))
195 #define ip4_addr2_16_val(ipaddr) ((u16_t)ip4_addr2_val(ipaddr))
196 #define ip4_addr3_16_val(ipaddr) ((u16_t)ip4_addr3_val(ipaddr))
197 #define ip4_addr4_16_val(ipaddr) ((u16_t)ip4_addr4_val(ipaddr))
198 
199 #define IP4ADDR_STRLEN_MAX 16
200 
201 /** For backwards compatibility */
202 #define ip_ntoa(ipaddr) ipaddr_ntoa(ipaddr)
203 
204 u32_t ipaddr_addr(const char *cp);
205 int ip4addr_aton(const char *cp, ip4_addr_t *addr);
206 /** returns ptr to static buffer; not reentrant! */
207 char *ip4addr_ntoa(const ip4_addr_t *addr);
208 char *ip4addr_ntoa_r(const ip4_addr_t *addr, char *buf, int buflen);
209 
210 #ifdef __cplusplus
211 }
212 #endif
213 
214 #endif /* LWIP_IPV4 */
215 
216 #endif /* LWIP_HDR_IP_ADDR_H */
various utility macros
lwIP Options Configuration
Generic data structure used for all lwIP network interfaces.
IP address structure for passing IP addresses by value.
Definition: nsapi_types.h:235
Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.