Gerhard Sittig f395e75e27 net: dns: fix for DNS queries sent to the wrong MAC address ...

When a DNS query is sent out, the ethernet packet can get directed to
the MAC address of a server that was communicated to before.  This is
wrong when the previously stored MAC address corresponds to a different
server's IP address, i.e. when the IP address of the previous and the
current communication are different.

The error can get reproduced by running a sequence of e.g. a TFTP
download and a DNS query, where the TFTP and DNS servers reside on
individual machines.

The fix is to clear the server's MAC address that might be left from a
previous operation, and to fetch the peer's MAC address in a new ARP
lookup, before the DNS query is sent.  This is the approach taken in
other network services, like 8e52533d10 ("net: tftpsrv: Get correct
client MAC address").

Reported-by: Dirk Zimoch <dirk.zimoch@psi.ch>
Signed-off-by: Gerhard Sittig <gsi@denx.de>

2014-09-16 12:24:00 -04:00

..

arp.c

net/: sparse fixes

2012-11-04 11:00:36 -07:00

arp.h

net: Separate ArpRequest() into lower-level func

2012-05-23 17:53:07 -05:00

bootp.c

net: More BOOTP retry timeout improvements

2014-08-21 12:01:30 -04:00

bootp.h

net: BOOTP retry timeout improvements

2014-08-09 11:17:03 -04:00

cdp.c

net: Refactor to separate the UDP handler from the ARP handler

2012-05-23 17:52:53 -05:00

cdp.h

net: cosmetic: Rename CDPHandler to cdp_receive

2012-05-23 17:46:16 -05:00

dns.c

net: dns: fix for DNS queries sent to the wrong MAC address

2014-09-16 12:24:00 -04:00

dns.h

Add GPL-2.0+ SPDX-License-Identifier to source files

2013-07-24 09:44:38 -04:00

eth.c

Ethernet: let user know if there is no valid ethernet address

2014-07-22 07:44:28 -04:00

link_local.c

net: Correct check for link-local target IP conflict

2013-06-24 19:11:13 -05:00

link_local.h

net: Add link-local addressing support

2012-05-23 17:53:08 -05:00

Makefile

kbuild: use Linux Kernel build scripts

2014-02-19 11:07:50 -05:00

net_rand.h

net: use common rand()/srand() functions

2012-07-07 14:07:32 +02:00

net.c

net: BOOTP retry timeout improvements

2014-08-09 11:17:03 -04:00

nfs.c

net: nfs: add dynamic wait period

2013-06-24 19:10:15 -05:00

nfs.h

Add GPL-2.0+ SPDX-License-Identifier to source files

2013-07-24 09:44:38 -04:00

ping.c

net: Allow filtering on debug traces in the net subsystem

2012-05-23 17:53:08 -05:00

ping.h

net/: sparse fixes

2012-11-04 11:00:36 -07:00

rarp.c

Add GPL-2.0+ SPDX-License-Identifier to source files

2013-07-24 09:44:38 -04:00

rarp.h

Add GPL-2.0+ SPDX-License-Identifier to source files

2013-07-24 09:44:38 -04:00

sntp.c

net: Refactor to separate the UDP handler from the ARP handler

2012-05-23 17:52:53 -05:00

sntp.h

Add GPL-2.0+ SPDX-License-Identifier to source files

2013-07-24 09:44:38 -04:00

tftp.c

net: tftpsrv: Get correct client MAC address

2013-11-22 17:03:18 -06:00

tftp.h

net/: sparse fixes

2012-11-04 11:00:36 -07:00