Line data    Source code

       1             : /*
       2             :  * Copyright (c) 2020 Cisco and/or its affiliates.
       3             :  * Licensed under the Apache License, Version 2.0 (the "License");
       4             :  * you may not use this file except in compliance with the License.
       5             :  * You may obtain a copy of the License at:
       6             :  *
       7             :  *     http://www.apache.org/licenses/LICENSE-2.0
       8             :  *
       9             :  * Unless required by applicable law or agreed to in writing, software
      10             :  * distributed under the License is distributed on an "AS IS" BASIS,
      11             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             :  * See the License for the specific language governing permissions and
      13             :  * limitations under the License.
      14             :  */
      15             : 
      16             : #ifndef included_vnet_mpcap_h
      17             : #define included_vnet_mpcap_h
      18             : 
      19             : #include <vnet/vnet.h>
      20             : #include <vppinfra/mpcap.h>
      21             : 
      22             : /**
      23             :  * @brief Add packet
      24             :  *
      25             :  * @param *pm - mpcap_main_t
      26             :  * @param time_now - f64
      27             :  * @param n_bytes_in_trace - u32
      28             :  * @param n_bytes_in_packet - u32
      29             :  *
      30             :  * @return Packet Data
      31             :  *
      32             :  */
      33             : static inline void *
      34          15 : mpcap_add_packet (mpcap_main_t * pm,
      35             :                   f64 time_now, u32 n_bytes_in_trace, u32 n_bytes_in_packet)
      36             : {
      37             :   mpcap_packet_header_t *h;
      38             :   u8 *d;
      39             : 
      40             :   /* File already closed? */
      41          15 :   if (PREDICT_FALSE (pm->flags & MPCAP_FLAG_INIT_DONE) == 0)
      42           0 :     return 0;
      43             : 
      44          15 :   d = pm->current_va;
      45          15 :   pm->current_va += sizeof (h[0]) + n_bytes_in_trace;
      46             : 
      47             :   /* Out of space? */
      48          15 :   if (PREDICT_FALSE (pm->current_va >= pm->file_baseva + pm->max_file_size))
      49           0 :     return 0;
      50          15 :   h = (void *) (d);
      51          15 :   h->time_in_sec = time_now;
      52          15 :   h->time_in_usec = 1e6 * (time_now - h->time_in_sec);
      53          15 :   h->n_packet_bytes_stored_in_file = n_bytes_in_trace;
      54          15 :   h->n_bytes_in_packet = n_bytes_in_packet;
      55          15 :   pm->n_packets_captured++;
      56          15 :   return h->data;
      57             : }
      58             : 
      59             : /**
      60             :  * @brief Add buffer (vlib_buffer_t) to the trace
      61             :  *
      62             :  * @param *pm - mpcap_main_t
      63             :  * @param *vm - vlib_main_t
      64             :  * @param time_now - f64
      65             :  * @param buffer_index - u32
      66             :  * @param n_bytes_in_trace - u32
      67             :  *
      68             :  */
      69             : static inline void
      70          15 : mpcap_add_buffer (mpcap_main_t * pm,
      71             :                   vlib_main_t * vm,
      72             :                   f64 time_now, u32 buffer_index, u32 n_bytes_in_trace)
      73             : {
      74          15 :   vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index);
      75          15 :   u32 n = vlib_buffer_length_in_chain (vm, b);
      76          15 :   i32 n_left = clib_min (n_bytes_in_trace, n);
      77             :   void *d;
      78             : 
      79          15 :   clib_spinlock_lock_if_init (&pm->lock);
      80             : 
      81          15 :   d = mpcap_add_packet (pm, time_now, n_left, n);
      82          15 :   if (PREDICT_FALSE (d == 0))
      83             :     {
      84           0 :       mpcap_close (pm);
      85           0 :       clib_spinlock_unlock_if_init (&pm->lock);
      86           0 :       return;
      87             :     }
      88             : 
      89             :   while (1)
      90           0 :     {
      91          15 :       u32 copy_length = clib_min ((u32) n_left, b->current_length);
      92          15 :       clib_memcpy (d, b->data + b->current_data, copy_length);
      93          15 :       n_left -= b->current_length;
      94          15 :       if (n_left <= 0)
      95          15 :         break;
      96           0 :       d += b->current_length;
      97           0 :       ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
      98           0 :       b = vlib_get_buffer (vm, b->next_buffer);
      99             :     }
     100          15 :   if (pm->n_packets_captured >= pm->n_packets_to_capture)
     101           1 :     mpcap_close (pm);
     102             : 
     103          15 :   clib_spinlock_unlock_if_init (&pm->lock);
     104             : }
     105             : #endif /* included_vnet_mpcap_h */
     106             : 
     107             : /*
     108             :  * fd.io coding-style-patch-verification: ON
     109             :  *
     110             :  * Local Variables:
     111             :  * eval: (c-set-style "gnu")
     112             :  * End:
     113             :  */