diff options
Diffstat (limited to 'src/vnet/ipsec/ipsec_tun_in.c')
| -rw-r--r-- | src/vnet/ipsec/ipsec_tun_in.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/src/vnet/ipsec/ipsec_tun_in.c b/src/vnet/ipsec/ipsec_tun_in.c index 4f8af006d2b..c414be05f7e 100644 --- a/src/vnet/ipsec/ipsec_tun_in.c +++ b/src/vnet/ipsec/ipsec_tun_in.c @@ -186,18 +186,35 @@ ipsec_tun_protect_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, { ip60 = (ip6_header_t *) ip40; esp0 = (esp_header_t *) (ip60 + 1); - hdr_sz0 = sizeof (ip6_header_t); + buf_rewind0 = hdr_sz0 = sizeof (ip6_header_t); } else { - /* NAT UDP port 4500 case, don't advance any more */ if (ip40->protocol == IP_PROTOCOL_UDP) { + /* NAT UDP port 4500 case, don't advance any more */ esp0 = (esp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40) + sizeof (udp_header_t)); hdr_sz0 = 0; buf_rewind0 = ip4_header_bytes (ip40) + sizeof (udp_header_t); + + const udp_header_t *udp0 = + (udp_header_t *) ((u8 *) ip40 + ip4_header_bytes (ip40)); + + /* length 9 = sizeof(udp_header) + 1 byte of special SPI */ + if (clib_net_to_host_u16 (udp0->length) == 9 && + esp0->spi_bytes[0] == 0xff) + { + b[0]->error = + node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_NAT_KEEPALIVE]; + + next[0] = VNET_DEVICE_INPUT_NEXT_IP4_DROP; + len0 = 0; + + vlib_buffer_advance (b[0], -buf_rewind0); + goto trace00; + } } else { @@ -213,15 +230,11 @@ ipsec_tun_protect_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, if (len0 < sizeof (esp_header_t)) { - if (esp0->spi_bytes[0] == 0xff) - b[0]->error = - node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_NAT_KEEPALIVE]; - else - b[0]->error = - node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_TOO_SHORT]; + b[0]->error = node->errors[IPSEC_TUN_PROTECT_INPUT_ERROR_TOO_SHORT]; next[0] = is_ip6 ? VNET_DEVICE_INPUT_NEXT_IP6_DROP : VNET_DEVICE_INPUT_NEXT_IP4_DROP; + vlib_buffer_advance (b[0], -buf_rewind0); goto trace00; } |