linux/net/xfrm
Steffen Klassert 3b59df46a4 xfrm: Workaround incompatibility of ESN and async crypto
ESN for esp is defined in RFC 4303. This RFC assumes that the
sequence number counters are always up to date. However,
this is not true if an async crypto algorithm is employed.

If the sequence number counters are not up to date on sequence
number check, we may incorrectly update the upper 32 bit of
the sequence number. This leads to a DOS.

We workaround this by comparing the upper sequence number,
(used for authentication) with the upper sequence number
computed after the async processing. We drop the packet
if these numbers are different.

To do this, we introduce a recheck function that does this
check in the ESN case.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-09-04 14:09:45 -04:00
..
Kconfig xfrm: make xfrm_algo.c a module 2012-05-15 13:13:34 -04:00
Makefile xfrm: make xfrm_algo.c a module 2012-05-15 13:13:34 -04:00
xfrm_algo.c xfrm_algo: drop an unnecessary inclusion 2012-05-15 13:13:34 -04:00
xfrm_hash.c net: allow GFP_HIGHMEM in __vmalloc() 2010-11-21 10:04:04 -08:00
xfrm_hash.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
xfrm_input.c xfrm: Workaround incompatibility of ESN and async crypto 2012-09-04 14:09:45 -04:00
xfrm_ipcomp.c net: add skb frag size accessors 2011-10-19 03:10:46 -04:00
xfrm_output.c xfrm: Remove unused xfrm_state from xfrm_state_check_space 2012-03-22 19:29:58 -04:00
xfrm_policy.c net: ipv6: fix oops in inet_putpeer() 2012-08-20 02:56:56 -07:00
xfrm_proc.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
xfrm_replay.c xfrm: Workaround incompatibility of ESN and async crypto 2012-09-04 14:09:45 -04:00
xfrm_state.c net/xfrm/xfrm_state.c: fix error return code 2012-08-31 16:27:48 -04:00
xfrm_sysctl.c net: Convert all sysctl registrations to register_net_sysctl 2012-04-20 21:22:30 -04:00
xfrm_user.c netlink: add netlink_kernel_cfg parameter to netlink_kernel_create 2012-06-29 16:46:02 -07:00