path: root/net/dccp/ipv4.c
diff options
authorDavid S. Miller <davem@davemloft.net>2011-08-03 20:50:44 -0700
committerDavid S. Miller <davem@davemloft.net>2011-08-06 18:33:19 -0700
commit6e5714eaf77d79ae1c8b47e3e040ff5411b717ec (patch)
tree30bd0d7a6a0a6ff0ace6da1835ae7b7167cce5e4 /net/dccp/ipv4.c
parentcrypto: Move md5_transform to lib/md5.c (diff)
net: Compute protocol sequence numbers and fragment IDs using MD5.
Computers have become a lot faster since we compromised on the partial MD4 hash which we use currently for performance reasons. MD5 is a much safer choice, and is inline with both RFC1948 and other ISS generators (OpenBSD, Solaris, etc.) Furthermore, only having 24-bits of the sequence number be truly unpredictable is a very serious limitation. So the periodic regeneration and 8-bit counter have been removed. We compute and use a full 32-bit sequence number. For ipv6, DCCP was found to use a 32-bit truncated initial sequence number (it needs 43-bits) and that is fixed here as well. Reported-by: Dan Kaminsky <dan@doxpara.com> Tested-by: Willy Tarreau <w@1wt.eu> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
1 files changed, 1 insertions, 0 deletions
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 8c36adfd1919..332639b56f4d 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -26,6 +26,7 @@
#include <net/timewait_sock.h>
#include <net/tcp_states.h>
#include <net/xfrm.h>
+#include <net/secure_seq.h>
#include "ackvec.h"
#include "ccid.h"