Line data    Source code

       1             : /*
       2             :  * pcap_classify.h - Use the classifier to decide if a packet is captured
       3             :  *
       4             :  * Copyright (c) 2021 Cisco and/or its affiliates.
       5             :  * Licensed under the Apache License, Version 2.0 (the "License");
       6             :  * you may not use this file except in compliance with the License.
       7             :  * You may obtain a copy of the License at:
       8             :  *
       9             :  *     http://www.apache.org/licenses/LICENSE-2.0
      10             :  *
      11             :  * Unless required by applicable law or agreed to in writing, software
      12             :  * distributed under the License is distributed on an "AS IS" BASIS,
      13             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      14             :  * See the License for the specific language governing permissions and
      15             :  * limitations under the License.
      16             :  */
      17             : #include <vlib/vlib.h>
      18             : #include <vnet/vnet.h>
      19             : #include <vnet/classify/vnet_classify.h>
      20             : #include <vnet/classify/trace_classify.h>
      21             : 
      22             : /** @file pcap_classify.h
      23             :  * Use the vpp classifier to decide whether to capture packets
      24             :  */
      25             : 
      26             : /** @brief vnet_is_packet_pcaped
      27             :  * @param vlib_buffer_t *b - packet to capture
      28             :  * @return 0 => no capture, 1 => capture
      29             :  */
      30             : 
      31             : static_always_inline int
      32         386 : vnet_is_packet_pcaped (vnet_pcap_t *pp, vlib_buffer_t *b, u32 sw_if_index)
      33             : {
      34         386 :   const u32 pcap_sw_if_index = pp->pcap_sw_if_index;
      35         386 :   const u32 filter_classify_table_index = pp->filter_classify_table_index;
      36         386 :   const vlib_error_t pcap_error_index = pp->pcap_error_index;
      37             : 
      38         386 :   if (pcap_sw_if_index != 0)
      39             :     {
      40         234 :       if (~0 == sw_if_index)
      41         117 :         sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
      42         234 :       if (pcap_sw_if_index != sw_if_index)
      43         117 :         return 0; /* wrong interface, skip */
      44             :     }
      45             : 
      46         269 :   if (pcap_error_index != (vlib_error_t) ~0 && pcap_error_index != b->error)
      47           1 :     return 0; /* wrong error */
      48             : 
      49         447 :   if (filter_classify_table_index != ~0 &&
      50         179 :       vnet_is_packet_traced_inline (b, filter_classify_table_index,
      51             :                                     0 /* full classify */) != 1)
      52          93 :     return 0; /* not matching the filter, skip */
      53             : 
      54         175 :   return 1; /* success */
      55             : }
      56             : 
      57             : /*
      58             :  * fd.io coding-style-patch-verification: ON
      59             :  *
      60             :  * Local Variables:
      61             :  * eval: (c-set-style "gnu")
      62             :  * End:
      63             :  */