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authorNeale Ranns <nranns@cisco.com>2019-04-18 19:49:13 -0700
committerDave Wallace <dwallacelf@gmail.com>2019-04-19 18:29:19 +0000
commit1b582b8e9264ca2514a5118ca0de0a3a5b8f5ba4 (patch)
treeeeb42ff6223d4e37869f94308379bd4ca460ea09
parent1b52ca965c907812f8279dfeeee95341f15b3439 (diff)
IPSEC: IPv6 ESP transport mode incorrect packet length and checksum (VPP-1654)
Change-Id: Ia3474e5bfea5764eae9b2987bf78296535df6778 Signed-off-by: Neale Ranns <nranns@cisco.com>
-rw-r--r--src/vnet/ipsec/esp_encrypt.c21
-rw-r--r--test/template_ipsec.py4
2 files changed, 18 insertions, 7 deletions
diff --git a/src/vnet/ipsec/esp_encrypt.c b/src/vnet/ipsec/esp_encrypt.c
index f1153d92e8c..5db10b520e3 100644
--- a/src/vnet/ipsec/esp_encrypt.c
+++ b/src/vnet/ipsec/esp_encrypt.c
@@ -112,19 +112,26 @@ esp_add_footer_and_icv (vlib_buffer_t * b, u8 block_size, u8 icv_sz)
static_always_inline void
esp_update_ip4_hdr (ip4_header_t * ip4, u16 len, int is_transport, int is_udp)
{
- ip_csum_t sum = ip4->checksum;
- u16 old_len = 0;
+ ip_csum_t sum;
+ u16 old_len;
+
+ len = clib_net_to_host_u16 (len);
+ old_len = ip4->length;
if (is_transport)
{
u8 prot = is_udp ? IP_PROTOCOL_UDP : IP_PROTOCOL_IPSEC_ESP;
- old_len = ip4->length;
- sum = ip_csum_update (sum, ip4->protocol, prot, ip4_header_t, protocol);
+
+ sum = ip_csum_update (ip4->checksum, ip4->protocol,
+ prot, ip4_header_t, protocol);
ip4->protocol = prot;
+
+ sum = ip_csum_update (sum, old_len, len, ip4_header_t, length);
}
+ else
+ sum = ip_csum_update (ip4->checksum, old_len, len, ip4_header_t, length);
- ip4->length = len = clib_net_to_host_u16 (len);
- sum = ip_csum_update (ip4->checksum, old_len, len, ip4_header_t, length);
+ ip4->length = len;
ip4->checksum = ip_csum_fold (sum);
}
@@ -411,7 +418,7 @@ esp_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
u16 len;
ip4_header_t *ip4 = (ip4_header_t *) (ip_hdr);
*next_hdr_ptr = ip4->protocol;
- len = payload_len + hdr_len + l2_len;
+ len = payload_len + hdr_len - l2_len;
if (udp)
{
esp_update_ip4_hdr (ip4, len, /* is_transport */ 1, 1);
diff --git a/test/template_ipsec.py b/test/template_ipsec.py
index 17470d93e3a..3a978205b1e 100644
--- a/test/template_ipsec.py
+++ b/test/template_ipsec.py
@@ -412,6 +412,8 @@ class IpsecTra4(object):
recv_pkts = self.send_and_expect(self.tra_if, send_pkts,
self.tra_if)
for rx in recv_pkts:
+ self.assertEqual(len(rx) - len(Ether()), rx[IP].len)
+ self.assert_packet_checksums_valid(rx)
try:
decrypted = p.vpp_tra_sa.decrypt(rx[IP])
self.assert_packet_checksums_valid(decrypted)
@@ -534,6 +536,8 @@ class IpsecTun4(object):
def verify_encrypted(self, p, sa, rxs):
decrypt_pkts = []
for rx in rxs:
+ self.assert_packet_checksums_valid(rx)
+ self.assertEqual(len(rx) - len(Ether()), rx[IP].len)
try:
decrypt_pkt = p.vpp_tun_sa.decrypt(rx[IP])
if not decrypt_pkt.haslayer(IP):