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autoip.h/.c: change autoip_init & autoip_create_rand_addr to use netif's MAC address and tried_llipaddr to generate an "autoip"...

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This commit is contained in:
fbernon 2007-06-22 18:54:34 +00:00
parent 0c18e653e8
commit a1d176b643
2 changed files with 16 additions and 31 deletions
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43
src/core/ipv4/autoip.c
View File

@ -81,8 +81,8 @@
/* static functions */
static void autoip_handle_arp_conflict(struct netif *netif);
/* creates random LL IP-Address */
static void autoip_create_rand_addr(struct ip_addr *RandomIPAddr);
/* creates random LL IP-Address for a network interface */
static void autoip_create_rand_addr(struct netif *netif, struct ip_addr *RandomIPAddr);
/* sends an ARP announce */
static err_t autoip_arp_announce(struct netif *netif);
@ -92,33 +92,11 @@ static err_t autoip_bind(struct netif *netif);
/**
* Initialize this module
* seed random with MAC-Address for creating pseudo-ramdom link-local address
*/
void
autoip_init(void)
{
struct netif *netif = netif_list;
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n"));
/* loop through netif's */
while (netif != NULL) {
/* if we find a ETHARP interface... */
if (netif->flags & NETIF_FLAG_ETHARP) {
/* seed random with MAC-Address */
srand( (netif->hwaddr[2] << 24) |
(netif->hwaddr[3] << 16) |
(netif->hwaddr[4] << 8) |
(netif->hwaddr[5] << 0));
return;
}
/* proceed to next network interface */
netif = netif->next;
}
/* we don't have found any ETHARP interface, initialize seed random with a magic number */
srand(0xCA39B718 /* Any magic value */);
}
/**
@ -154,17 +132,23 @@ autoip_handle_arp_conflict(struct netif *netif)
/**
* Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
*
* @param netif network interface on which create the IP-Address
* @param RandomIPAddr ip address to initialize
*/
static void
autoip_create_rand_addr(struct ip_addr *RandomIPAddr)
autoip_create_rand_addr(struct netif *netif, struct ip_addr *RandomIPAddr)
{
/* 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
*/
RandomIPAddr->addr = htonl((u32_t)(rand() % (0xA9FEFEFF + 1 - 0xA9FE0100) + 0xA9FE0100));
RandomIPAddr->addr = (0xA9FE0100 + ((u32_t)(((u8_t)(netif->hwaddr[4])) | ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)) + netif->autoip->tried_llipaddr);
if (RandomIPAddr->addr>0xA9FEFEFF) RandomIPAddr->addr = (0xA9FE0100 + (RandomIPAddr->addr-0xA9FEFEFF));
if (RandomIPAddr->addr<0xA9FE0100) RandomIPAddr->addr = (0xA9FEFEFF - (0xA9FE0100-RandomIPAddr->addr));
RandomIPAddr->addr = htonl(RandomIPAddr->addr);
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, ("autoip_create_rand_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n", (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(RandomIPAddr->addr)));
}
/**
@ -205,7 +189,8 @@ autoip_bind(struct netif *netif)
{
struct autoip *autoip = netif->autoip;
struct ip_addr sn_mask, gw_addr;
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr));
IP4_ADDR(&sn_mask, 255, 255, 0, 0);
IP4_ADDR(&gw_addr, 0, 0, 0, 0);
@ -263,7 +248,7 @@ autoip_start(struct netif *netif)
autoip->lastconflict = 0;
}
autoip_create_rand_addr(&(autoip->llipaddr));
autoip_create_rand_addr(netif, &(autoip->llipaddr));
autoip->tried_llipaddr++;
autoip->state = AUTOIP_STATE_PROBING;
autoip->sent_num = 0;
@ -315,7 +300,7 @@ autoip_tmr()
netif->autoip->lastconflict--;
}
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_tmr() AutoIP-State: %d\n", netif->autoip->state));
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n", (u16_t)(netif->autoip->state), netif->autoip->ttw));
switch(netif->autoip->state) {
case AUTOIP_STATE_PROBING:

2
src/include/ipv4/lwip/autoip.h
View File

@ -73,12 +73,12 @@
struct autoip
{
struct ip_addr llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
u8_t state; /* current AutoIP state machine state */
u8_t sent_num; /* sent number of probes or announces, dependent on state */
u16_t ttw; /* ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
u8_t lastconflict; /* ticks until a conflict can be solved by defending */
u8_t tried_llipaddr; /* total number of probed/used Link Local IP-Addresses */
struct ip_addr llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
};