diff options
| author |   Zachary Leaf <zachary.leaf@arm.com> | 2021-10-26 10:05:58 -0500 |
|---|---|---|
| committer |   Fan Zhang <roy.fan.zhang@intel.com> | 2022-03-08 17:43:43 +0000 |
| commit | 26fec718f2fa7913a484008fca7b1bc015c6efb5 (patch) | |
| tree | d1ff50ea37c938f7caa4b88ca25885c13f83d4bb /src/vnet/ipsec/ipsec_input.c | |
| parent | 1031098b903e6eb4bca4d268350795e6827abdda (diff) | |
ipsec: input: drop by default for non-matching pkts
As per IPSec RFC4301 [1], any non-matching packets should be dropped by
default. This is handled correctly in ipsec_output.c, however in
ipsec_input.c non-matching packets are allowed to pass as per a matched
BYPASS rule.
For full details, see:
https://lists.fd.io/g/vpp-dev/topic/ipsec_input_output_default/84943480
It appears the ipsec6_input_node only matches PROTECT policies. Until
this is extended to handle BYPASS + DISCARD, we may wish to not drop
by default here, since all IPv6 traffic not matching a PROTECT policy
will be dropped.
[1]: https://datatracker.ietf.org/doc/html/rfc4301
Type: fix
Signed-off-by: Zachary Leaf <zachary.leaf@arm.com>
Change-Id: Iddbfd008dbe082486d1928f6a10ffbd83d859a20
Diffstat (limited to 'src/vnet/ipsec/ipsec_input.c')
| -rw-r--r-- | src/vnet/ipsec/ipsec_input.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ipsec_input.c b/src/vnet/ipsec/ipsec_input.c index 96bad28c2b5..c47ea34f288 100644 --- a/src/vnet/ipsec/ipsec_input.c +++ b/src/vnet/ipsec/ipsec_input.c @@ -331,6 +331,11 @@ VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm, p0 = 0; pi0 = ~0; }; + + /* Drop by default if no match on PROTECT, BYPASS or DISCARD */ + ipsec_unprocessed += 1; + next[0] = IPSEC_INPUT_NEXT_DROP; + trace0: if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) @@ -427,6 +432,11 @@ VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm, p0 = 0; pi0 = ~0; }; + + /* Drop by default if no match on PROTECT, BYPASS or DISCARD */ + ipsec_unprocessed += 1; + next[0] = IPSEC_INPUT_NEXT_DROP; + trace1: if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) @@ -581,6 +591,8 @@ VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm, else { pi0 = ~0; + ipsec_unprocessed += 1; + next0 = IPSEC_INPUT_NEXT_DROP; } } else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH) @@ -608,6 +620,8 @@ VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm, else { pi0 = ~0; + ipsec_unprocessed += 1; + next0 = IPSEC_INPUT_NEXT_DROP; } } else |