diff options
Diffstat (limited to 'src/vnet/ip/ip4_input.h')
| -rw-r--r-- | src/vnet/ip/ip4_input.h | 97 |
1 files changed, 28 insertions, 69 deletions
diff --git a/src/vnet/ip/ip4_input.h b/src/vnet/ip/ip4_input.h index e0873039990..889b423d700 100644 --- a/src/vnet/ip/ip4_input.h +++ b/src/vnet/ip/ip4_input.h @@ -56,6 +56,26 @@ typedef enum IP4_INPUT_N_NEXT, } ip4_input_next_t; +static_always_inline void +check_ver_opt_csum (ip4_header_t * ip, u8 * error, int verify_checksum) +{ + if (PREDICT_FALSE (ip->ip_version_and_header_length != 0x45)) + { + if ((ip->ip_version_and_header_length & 0xf) != 5) + { + *error = IP4_ERROR_OPTIONS; + if (verify_checksum && ip_csum (ip, ip4_header_bytes (ip)) != 0) + *error = IP4_ERROR_BAD_CHECKSUM; + } + else + *error = IP4_ERROR_VERSION; + } + else + if (PREDICT_FALSE (verify_checksum && + ip_csum (ip, sizeof (ip4_header_t)) != 0)) + *error = IP4_ERROR_BAD_CHECKSUM; +} + always_inline void ip4_input_check_x4 (vlib_main_t * vm, vlib_node_runtime_t * error_node, @@ -71,22 +91,10 @@ ip4_input_check_x4 (vlib_main_t * vm, error0 = error1 = error2 = error3 = IP4_ERROR_NONE; - /* Punt packets with options or wrong version. */ - if (PREDICT_FALSE (ip[0]->ip_version_and_header_length != 0x45)) - error0 = (ip[0]->ip_version_and_header_length & 0xf) != 5 ? - IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; - - if (PREDICT_FALSE (ip[1]->ip_version_and_header_length != 0x45)) - error1 = (ip[1]->ip_version_and_header_length & 0xf) != 5 ? - IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; - - if (PREDICT_FALSE (ip[2]->ip_version_and_header_length != 0x45)) - error2 = (ip[2]->ip_version_and_header_length & 0xf) != 5 ? - IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; - - if (PREDICT_FALSE (ip[3]->ip_version_and_header_length != 0x45)) - error3 = (ip[3]->ip_version_and_header_length & 0xf) != 5 ? - IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; + check_ver_opt_csum (ip[0], &error0, verify_checksum); + check_ver_opt_csum (ip[1], &error1, verify_checksum); + check_ver_opt_csum (ip[2], &error2, verify_checksum); + check_ver_opt_csum (ip[3], &error3, verify_checksum); if (PREDICT_FALSE (ip[0]->ttl < 1)) error0 = IP4_ERROR_TIME_EXPIRED; @@ -97,26 +105,6 @@ ip4_input_check_x4 (vlib_main_t * vm, if (PREDICT_FALSE (ip[3]->ttl < 1)) error3 = IP4_ERROR_TIME_EXPIRED; - /* Verify header checksum. */ - if (verify_checksum) - { - ip_csum_t sum0, sum1, sum2, sum3; - - ip4_partial_header_checksum_x1 (ip[0], sum0); - ip4_partial_header_checksum_x1 (ip[1], sum1); - ip4_partial_header_checksum_x1 (ip[2], sum2); - ip4_partial_header_checksum_x1 (ip[3], sum3); - - error0 = 0xffff != ip_csum_fold (sum0) ? - IP4_ERROR_BAD_CHECKSUM : error0; - error1 = 0xffff != ip_csum_fold (sum1) ? - IP4_ERROR_BAD_CHECKSUM : error1; - error2 = 0xffff != ip_csum_fold (sum2) ? - IP4_ERROR_BAD_CHECKSUM : error2; - error3 = 0xffff != ip_csum_fold (sum3) ? - IP4_ERROR_BAD_CHECKSUM : error3; - } - /* Drop fragmentation offset 1 packets. */ error0 = ip4_get_fragment_offset (ip[0]) == 1 ? IP4_ERROR_FRAGMENT_OFFSET_ONE : error0; @@ -226,34 +214,14 @@ ip4_input_check_x2 (vlib_main_t * vm, error0 = error1 = IP4_ERROR_NONE; - /* Punt packets with options or wrong version. */ - if (PREDICT_FALSE (ip0->ip_version_and_header_length != 0x45)) - error0 = (ip0->ip_version_and_header_length & 0xf) != 5 ? - IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; - - if (PREDICT_FALSE (ip1->ip_version_and_header_length != 0x45)) - error1 = (ip1->ip_version_and_header_length & 0xf) != 5 ? - IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; + check_ver_opt_csum (ip0, &error0, verify_checksum); + check_ver_opt_csum (ip1, &error1, verify_checksum); if (PREDICT_FALSE (ip0->ttl < 1)) error0 = IP4_ERROR_TIME_EXPIRED; if (PREDICT_FALSE (ip1->ttl < 1)) error1 = IP4_ERROR_TIME_EXPIRED; - /* Verify header checksum. */ - if (verify_checksum) - { - ip_csum_t sum0, sum1; - - ip4_partial_header_checksum_x1 (ip0, sum0); - ip4_partial_header_checksum_x1 (ip1, sum1); - - error0 = 0xffff != ip_csum_fold (sum0) ? - IP4_ERROR_BAD_CHECKSUM : error0; - error1 = 0xffff != ip_csum_fold (sum1) ? - IP4_ERROR_BAD_CHECKSUM : error1; - } - /* Drop fragmentation offset 1 packets. */ error0 = ip4_get_fragment_offset (ip0) == 1 ? IP4_ERROR_FRAGMENT_OFFSET_ONE : error0; @@ -320,22 +288,13 @@ ip4_input_check_x1 (vlib_main_t * vm, error0 = IP4_ERROR_NONE; + check_ver_opt_csum (ip0, &error0, verify_checksum); + /* Punt packets with options or wrong version. */ if (PREDICT_FALSE (ip0->ip_version_and_header_length != 0x45)) error0 = (ip0->ip_version_and_header_length & 0xf) != 5 ? IP4_ERROR_OPTIONS : IP4_ERROR_VERSION; - /* Verify header checksum. */ - if (verify_checksum) - { - ip_csum_t sum0; - - ip4_partial_header_checksum_x1 (ip0, sum0); - - error0 = 0xffff != ip_csum_fold (sum0) ? - IP4_ERROR_BAD_CHECKSUM : error0; - } - /* Drop fragmentation offset 1 packets. */ error0 = ip4_get_fragment_offset (ip0) == 1 ? IP4_ERROR_FRAGMENT_OFFSET_ONE : error0; |