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| author | David S. Miller <davem@davemloft.net> | 2011-08-03 20:50:44 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-15 18:31:35 -0700 |
| commit | e997d47bff5a467262ef224b4cf8cbba2d3eceea (patch) | |
| tree | 6560c0ac8f2b19a4b7f40db6cc22a9857fe4f1a3 /include/net | |
| parent | 2468b895fc7dcbc436cb02f0707ab8d7cb2f0aa7 (diff) | |
| download | kernel_samsung_smdk4412-e997d47bff5a467262ef224b4cf8cbba2d3eceea.zip kernel_samsung_smdk4412-e997d47bff5a467262ef224b4cf8cbba2d3eceea.tar.gz kernel_samsung_smdk4412-e997d47bff5a467262ef224b4cf8cbba2d3eceea.tar.bz2 | |
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/secure_seq.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/net/secure_seq.h b/include/net/secure_seq.h new file mode 100644 index 0000000..d97f689 --- /dev/null +++ b/include/net/secure_seq.h @@ -0,0 +1,20 @@ +#ifndef _NET_SECURE_SEQ +#define _NET_SECURE_SEQ + +#include <linux/types.h> + +extern __u32 secure_ip_id(__be32 daddr); +extern __u32 secure_ipv6_id(const __be32 daddr[4]); +extern u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport); +extern u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr, + __be16 dport); +extern __u32 secure_tcp_sequence_number(__be32 saddr, __be32 daddr, + __be16 sport, __be16 dport); +extern __u32 secure_tcpv6_sequence_number(__be32 *saddr, __be32 *daddr, + __be16 sport, __be16 dport); +extern u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr, + __be16 sport, __be16 dport); +extern u64 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr, + __be16 sport, __be16 dport); + +#endif /* _NET_SECURE_SEQ */ |