IP4_INPUT_N_NEXT,
} ip4_input_next_t;
+always_inline void
+ip4_input_check_x4 (vlib_main_t * vm,
+ vlib_node_runtime_t * error_node,
+ vlib_buffer_t ** p, ip4_header_t ** ip,
+ u16 * next, int verify_checksum)
+{
+ u8 error0, error1, error2, error3;
+ u32 ip_len0, cur_len0;
+ u32 ip_len1, cur_len1;
+ u32 ip_len2, cur_len2;
+ u32 ip_len3, cur_len3;
+ i32 len_diff0, len_diff1, len_diff2, len_diff3;
+
+ 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;
+
+ if (PREDICT_FALSE (ip[0]->ttl < 1))
+ error0 = IP4_ERROR_TIME_EXPIRED;
+ if (PREDICT_FALSE (ip[1]->ttl < 1))
+ error1 = IP4_ERROR_TIME_EXPIRED;
+ if (PREDICT_FALSE (ip[2]->ttl < 1))
+ error2 = IP4_ERROR_TIME_EXPIRED;
+ 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;
+ error1 = ip4_get_fragment_offset (ip[1]) == 1 ?
+ IP4_ERROR_FRAGMENT_OFFSET_ONE : error1;
+ error2 = ip4_get_fragment_offset (ip[2]) == 1 ?
+ IP4_ERROR_FRAGMENT_OFFSET_ONE : error2;
+ error3 = ip4_get_fragment_offset (ip[3]) == 1 ?
+ IP4_ERROR_FRAGMENT_OFFSET_ONE : error3;
+
+ /* Verify lengths. */
+ ip_len0 = clib_net_to_host_u16 (ip[0]->length);
+ ip_len1 = clib_net_to_host_u16 (ip[1]->length);
+ ip_len2 = clib_net_to_host_u16 (ip[2]->length);
+ ip_len3 = clib_net_to_host_u16 (ip[3]->length);
+
+ /* IP length must be at least minimal IP header. */
+ error0 = ip_len0 < sizeof (ip[0][0]) ? IP4_ERROR_TOO_SHORT : error0;
+ error1 = ip_len1 < sizeof (ip[1][0]) ? IP4_ERROR_TOO_SHORT : error1;
+ error2 = ip_len2 < sizeof (ip[2][0]) ? IP4_ERROR_TOO_SHORT : error2;
+ error3 = ip_len3 < sizeof (ip[3][0]) ? IP4_ERROR_TOO_SHORT : error3;
+
+ cur_len0 = vlib_buffer_length_in_chain (vm, p[0]);
+ cur_len1 = vlib_buffer_length_in_chain (vm, p[1]);
+ cur_len2 = vlib_buffer_length_in_chain (vm, p[2]);
+ cur_len3 = vlib_buffer_length_in_chain (vm, p[3]);
+
+ len_diff0 = cur_len0 - ip_len0;
+ len_diff1 = cur_len1 - ip_len1;
+ len_diff2 = cur_len2 - ip_len2;
+ len_diff3 = cur_len3 - ip_len3;
+
+ error0 = len_diff0 < 0 ? IP4_ERROR_BAD_LENGTH : error0;
+ error1 = len_diff1 < 0 ? IP4_ERROR_BAD_LENGTH : error1;
+ error2 = len_diff2 < 0 ? IP4_ERROR_BAD_LENGTH : error2;
+ error3 = len_diff3 < 0 ? IP4_ERROR_BAD_LENGTH : error3;
+
+ if (PREDICT_FALSE (error0 != IP4_ERROR_NONE))
+ {
+ if (error0 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p[0], ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next[0] = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next[0] = error0 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ p[0]->error = error_node->errors[error0];
+ }
+ if (PREDICT_FALSE (error1 != IP4_ERROR_NONE))
+ {
+ if (error1 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p[1], ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next[1] = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next[1] = error1 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ p[1]->error = error_node->errors[error1];
+ }
+ if (PREDICT_FALSE (error2 != IP4_ERROR_NONE))
+ {
+ if (error2 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p[2], ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next[2] = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next[2] = error2 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ p[2]->error = error_node->errors[error2];
+ }
+ if (PREDICT_FALSE (error3 != IP4_ERROR_NONE))
+ {
+ if (error3 == IP4_ERROR_TIME_EXPIRED)
+ {
+ icmp4_error_set_vnet_buffer (p[3], ICMP4_time_exceeded,
+ ICMP4_time_exceeded_ttl_exceeded_in_transit,
+ 0);
+ next[3] = IP4_INPUT_NEXT_ICMP_ERROR;
+ }
+ else
+ next[3] = error3 != IP4_ERROR_OPTIONS ?
+ IP4_INPUT_NEXT_DROP : IP4_INPUT_NEXT_PUNT;
+ p[3]->error = error_node->errors[error3];
+ }
+}
+
always_inline void
ip4_input_check_x2 (vlib_main_t * vm,
vlib_node_runtime_t * error_node,
Code Review / vpp.git / blobdiff