mirror/lwip
1
0
Fork 0
mirror of https://github.com/lwip-tcpip/lwip.git synced 2025-03-09 13:13:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

Another modification for patch #6683 (Customizable AUTOIP seed address)

Browse Source
This commit is contained in:
goldsimon 2008-12-10 17:08:42 +00:00
parent 2cf3e6e9bc
commit 6777ae2ada
1 changed files with 19 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
src/core/ipv4/autoip.c
View File

@ -76,10 +76,13 @@
#include <stdlib.h>
#include <string.h>
// 169.254.1.0
#define AUTOIP_RANGE_START 0xA9FE0100
// 169.254.254.255
#define AUTOIP_RANGE_END 0xA9FEFEFF
/* 169.254.0.0 */
#define AUTOIP_NET 0xA9FE0000
/* 169.254.1.0 */
#define AUTOIP_RANGE_START AUTOIP_NET | 0x0100
/* 169.254.254.255 */
#define AUTOIP_RANGE_END AUTOIP_NET | 0xFEFF
/** Pseudo random macro based on netif informations.
* You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
@ -166,24 +169,22 @@ autoip_create_addr(struct netif *netif, struct ip_addr *IPAddr)
{
/* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
* compliant to RFC 3927 Section 2.1
* We have 254 * 256 possibilities
*/
* We have 254 * 256 possibilities */
u16_t seed = LWIP_AUTOIP_CREATE_SEED_ADDR(netif);
/* seed must be between 0 and 0xFDFF since it is added to 169.254.1.0 */
if(seed > 0xFDFF) {
see -= 0x0200;
}
u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
addr += netif->autoip->tried_llipaddr;
addr = AUTOIP_NET | (addr & 0xffff);
/* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
IPAddr->addr = (AUTOIP_RANGE_START + seed + netif->autoip->tried_llipaddr);
if (IPAddr->addr > AUTOIP_RANGE_END) {
IPAddr->addr = (AUTOIP_RANGE_START + (IPAddr->addr - AUTOIP_RANGE_END));
if (addr < AUTOIP_RANGE_START) {
addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
}
if (IPAddr->addr < AUTOIP_RANGE_START) {
IPAddr->addr = (AUTOIP_RANGE_END - (AUTOIP_RANGE_START - IPAddr->addr));
if (addr > AUTOIP_RANGE_END) {
addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
}
IPAddr->addr = htonl(IPAddr->addr);
LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
(addr <= AUTOIP_RANGE_END));
IPAddr->addr = htonl(addr);
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
("autoip_create_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n",