| Dave Barach | 2a41919 | 2020-05-19 09:56:22 -0400 | [diff] [blame] | 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 | 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 | if (PREDICT_FALSE (pm->flags & MPCAP_FLAG_INIT_DONE) == 0) |
| 42 | return 0; |
| 43 | |
| 44 | d = pm->current_va; |
| 45 | pm->current_va += sizeof (h[0]) + n_bytes_in_trace; |
| 46 | |
| 47 | /* Out of space? */ |
| 48 | if (PREDICT_FALSE (pm->current_va >= pm->file_baseva + pm->max_file_size)) |
| 49 | return 0; |
| 50 | h = (void *) (d); |
| 51 | h->time_in_sec = time_now; |
| 52 | h->time_in_usec = 1e6 * (time_now - h->time_in_sec); |
| 53 | h->n_packet_bytes_stored_in_file = n_bytes_in_trace; |
| 54 | h->n_bytes_in_packet = n_bytes_in_packet; |
| 55 | pm->n_packets_captured++; |
| 56 | 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 | 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 | vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index); |
| 75 | u32 n = vlib_buffer_length_in_chain (vm, b); |
| 76 | i32 n_left = clib_min (n_bytes_in_trace, n); |
| 77 | void *d; |
| 78 | |
| 79 | clib_spinlock_lock_if_init (&pm->lock); |
| 80 | |
| 81 | d = mpcap_add_packet (pm, time_now, n_left, n); |
| 82 | if (PREDICT_FALSE (d == 0)) |
| 83 | { |
| 84 | mpcap_close (pm); |
| 85 | clib_spinlock_unlock_if_init (&pm->lock); |
| 86 | return; |
| 87 | } |
| 88 | |
| 89 | while (1) |
| 90 | { |
| 91 | u32 copy_length = clib_min ((u32) n_left, b->current_length); |
| 92 | clib_memcpy (d, b->data + b->current_data, copy_length); |
| 93 | n_left -= b->current_length; |
| 94 | if (n_left <= 0) |
| 95 | break; |
| 96 | d += b->current_length; |
| 97 | ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT); |
| 98 | b = vlib_get_buffer (vm, b->next_buffer); |
| 99 | } |
| 100 | if (pm->n_packets_captured >= pm->n_packets_to_capture) |
| 101 | mpcap_close (pm); |
| 102 | |
| 103 | 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 | */ |