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autoip.c: replace most of rand() calls by a macro LWIP_AUTOIP_RAND which compute a "pseudo-random" value based on netif's MAC and some autoip fields. It's always possible to define this macro in your own lwipopts.h to always use C library's rand(). Note that autoip_create_rand_addr doesn't use this macro.

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This commit is contained in:
fbernon 2007-06-28 18:05:38 +00:00
parent d73ca29a07
commit ab4c3a326f
2 changed files with 13 additions and 2 deletions
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6
CHANGELOG
View File

@ -238,6 +238,12 @@ HISTORY
++ Bug fixes:
2007-06-28 Frédéric Bernon
* autoip.c: replace most of rand() calls by a macro LWIP_AUTOIP_RAND which compute
a "pseudo-random" value based on netif's MAC and some autoip fields. It's always
possible to define this macro in your own lwipopts.h to always use C library's
rand(). Note that autoip_create_rand_addr doesn't use this macro.
2007-06-28 Frédéric Bernon
* netifapi.h, netifapi.c, tcpip.h, tcpip.c: Update code to handle the option
LWIP_TCPIP_CORE_LOCKING, and do some changes to be coherent with last modifications

9
src/core/ipv4/autoip.c
View File

@ -78,6 +78,11 @@
#error LWIP_ARP is need for LWIP_AUTOIP. Set it from your lwipopts.h.
#endif /* !LWIP_ARP */
/* pseudo random macro based on netif informations. You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
#ifndef LWIP_AUTOIP_RAND
#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | ((u32_t)((netif->hwaddr[4]) & 0xff))) + (netif->autoip?netif->autoip->tried_llipaddr:0))
#endif /* LWIP_AUTOIP_RAND */
/* static functions */
static void autoip_handle_arp_conflict(struct netif *netif);
@ -257,7 +262,7 @@ autoip_start(struct netif *netif)
* choosen out of 0 to PROBE_WAIT seconds.
* compliant to RFC 3927 Section 2.2.1
*/
autoip->ttw = (rand() % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
autoip->ttw = (LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
/*
* if we tried more then MAX_CONFLICTS we must limit our rate for
@ -316,7 +321,7 @@ autoip_tmr()
LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_tmr() PROBING Sent Probe\n"));
netif->autoip->sent_num++;
/* calculate time to wait to next probe */
netif->autoip->ttw = (rand() % ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + PROBE_MIN * AUTOIP_TICKS_PER_SECOND;
netif->autoip->ttw = (LWIP_AUTOIP_RAND(netif) % ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) + PROBE_MIN * AUTOIP_TICKS_PER_SECOND;
}
}
break;