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authorZachary Leaf <zachary.leaf@arm.com>2021-10-26 10:05:58 -0500
committerFan Zhang <roy.fan.zhang@intel.com>2022-03-08 17:43:43 +0000
commit26fec718f2fa7913a484008fca7b1bc015c6efb5 (patch)
treed1ff50ea37c938f7caa4b88ca25885c13f83d4bb /src/vnet
parent1031098b903e6eb4bca4d268350795e6827abdda (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')
-rw-r--r--src/vnet/ipsec/ipsec_input.c14
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