[lwip-devel] [bug #25576] DHCP may set ciaddr to invalid address

[Jakob Stoklund Olesen]

URL:
  <http://savannah.nongnu.org/bugs/?25576>

                 Summary: DHCP may set ciaddr to invalid address
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: stoklund
            Submitted on: Fri 13 Feb 2009 11:01:38 AM CET
                Category: IPv4
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

dhcp_create_request sets ciaddr to netif->if_addr.addr. When using AutoIP,
ciaddr may thus contain the AutoIP addr and not 0.0.0.0 as the current code
assumes.

According to RFC 2131 ciaddr MUST NOT be set unless in the BOUND, RENEWING,
or REBINDING state.

My DHCP server does not reply to requests with a wrong ciaddr field, so once
an AutoIP address has been chosen DHCP no longer works.

Patch #6721 fixes this bug.





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