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authorNeale Ranns <neale@graphiant.com>2021-06-28 13:31:28 +0000
committerBeno�t Ganne <bganne@cisco.com>2021-06-29 17:12:28 +0000
commit5b8911020ee5512d76c8daccaa199878ed7cbc01 (patch)
tree0c0960f5ffc12f1fe3d1a354a0736bd9ac374a07 /src/vnet/ipsec/esp.h
parent3871bd3a07dfc775c29ea333d10c05ced2fea80e (diff)
ipsec: Fix setting the hi-sequence number for decrypt
Type: fix two problems; 1 - just because anti-reply is not enabled doesn't mean the high sequence number should not be used. - fix, there needs to be some means to detect a wrapped packet, so we use a window size of 2^30. 2 - The SA object was used as a scratch pad for the high-sequence number used during decryption. That means that once the batch has been processed the high-sequence number used is lost. This means it is not possible to distinguish this case: if (seq < IPSEC_SA_ANTI_REPLAY_WINDOW_LOWER_BOUND (tl)) { ... if (post_decrypt) { if (hi_seq_used == sa->seq_hi) /* the high sequence number used to succesfully decrypt this * packet is the same as the last-sequnence number of the SA. * that means this packet did not cause a wrap. * this packet is thus out of window and should be dropped */ return 1; else /* The packet decrypted with a different high sequence number * to the SA, that means it is the wrap packet and should be * accepted */ return 0; } - fix: don't use the SA as a scratch pad, use the 'packet_data' - the same place that is used as the scratch pad for the low sequence number. other consequences: - An SA doesn't have seq and last_seq, it has only seq; the sequence numnber of the last packet tx'd or rx'd. - there's 64bits of space available on the SA's first cache line. move the AES CTR mode IV there. - test the ESN/AR combinations to catch the bugs this fixes. This doubles the amount of tests, but without AR on they only run for 2 seconds. In the AR tests, the time taken to wait for packets that won't arrive is dropped from 1 to 0.2 seconds thus reducing the runtime of these tests from 10-15 to about 5 sceonds. Signed-off-by: Neale Ranns <neale@graphiant.com> Change-Id: Iaac78905289a272dc01930d70decd8109cf5e7a5
Diffstat (limited to 'src/vnet/ipsec/esp.h')
-rw-r--r--src/vnet/ipsec/esp.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/vnet/ipsec/esp.h b/src/vnet/ipsec/esp.h
index a0643c3b939..d179233df49 100644
--- a/src/vnet/ipsec/esp.h
+++ b/src/vnet/ipsec/esp.h
@@ -118,7 +118,8 @@ esp_seq_advance (ipsec_sa_t * sa)
}
always_inline u16
-esp_aad_fill (u8 * data, const esp_header_t * esp, const ipsec_sa_t * sa)
+esp_aad_fill (u8 *data, const esp_header_t *esp, const ipsec_sa_t *sa,
+ u32 seq_hi)
{
esp_aead_t *aad;
@@ -128,7 +129,7 @@ esp_aad_fill (u8 * data, const esp_header_t * esp, const ipsec_sa_t * sa)
if (ipsec_sa_is_set_USE_ESN (sa))
{
/* SPI, seq-hi, seq-low */
- aad->data[1] = (u32) clib_host_to_net_u32 (sa->seq_hi);
+ aad->data[1] = (u32) clib_host_to_net_u32 (seq_hi);
aad->data[2] = esp->seq;
return 12;
}
@@ -199,7 +200,7 @@ typedef struct
i16 current_length;
u16 hdr_sz;
u16 is_chain;
- u32 protect_index;
+ u32 seq_hi;
} esp_decrypt_packet_data_t;
STATIC_ASSERT_SIZEOF (esp_decrypt_packet_data_t, 3 * sizeof (u64));