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* dhcp.c: fix bug #19927: "DHCP NACK problem" by clearing any existing set IP

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address entirely on receiving a DHCPNAK, and restarting discovery.
This commit is contained in:
jifl 2008-01-06 21:09:11 +00:00
parent a41f113b8f
commit bf924118de
2 changed files with 15 additions and 4 deletions
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4
CHANGELOG
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@ -564,6 +564,10 @@ HISTORY
++ Bug fixes:
2008-01-06 Jonathan Larmour
* dhcp.c: fix bug #19927: "DHCP NACK problem" by clearing any existing set IP
address entirely on receiving a DHCPNAK, and restarting discovery.
2007-12-21 Simon Goldschmidt
* sys.h, api_lib.c, api_msg.c, sockets.c: fix bug #21698: "netconn->recv_avail
is not protected" by using new macros for interlocked access to modify/test

15
src/core/dhcp.c
View File

@ -141,7 +141,8 @@ static void dhcp_option_trailer(struct dhcp *dhcp);
* NAK means the client asked for something non-sensible, for
* example when it tries to renew a lease obtained on another network.
*
* We back-off and will end up restarting a fresh DHCP negotiation later.
* We clear any existing set IP address and restart DHCP negotiation
* afresh (as per RFC2131 3.2.3).
*
* @param netif the netif under DHCP control
*/
@ -149,12 +150,18 @@ static void
dhcp_handle_nak(struct netif *netif)
{
struct dhcp *dhcp = netif->dhcp;
u16_t msecs = 10 * 1000;
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
(void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_handle_nak(): set request timeout %"U16_F" msecs\n", msecs));
/* Set the interface down since the address must no longer be used, as per RFC2131 */
netif_set_down(netif);
/* remove IP address from interface */
netif_set_ipaddr(netif, IP_ADDR_ANY);
netif_set_gw(netif, IP_ADDR_ANY);
netif_set_netmask(netif, IP_ADDR_ANY);
/* Change to a defined state */
dhcp_set_state(dhcp, DHCP_BACKING_OFF);
/* We can immediately restart discovery */
dhcp_discover();
}
/**