diff options
| -rw-r--r-- | src/vnet/interface_output.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/vnet/interface_output.c b/src/vnet/interface_output.c index e1c66ec4989..f51e9a1f27d 100644 --- a/src/vnet/interface_output.c +++ b/src/vnet/interface_output.c @@ -1192,8 +1192,19 @@ pcap_drop_trace (vlib_main_t * vm, /* * Typically, we'll need to rewind the buffer + * if l2_hdr_offset is valid, make sure to rewind to the start of + * the L2 header. This may not be the buffer start in case we pop-ed + * vlan tags. + * Otherwise, rewind to buffer start and hope for the best. */ - if (b0->current_data > 0) + if (b0->flags & VNET_BUFFER_F_L2_HDR_OFFSET_VALID) + { + if (b0->current_data > vnet_buffer (b0)->l2_hdr_offset) + vlib_buffer_advance (b0, + vnet_buffer (b0)->l2_hdr_offset - + b0->current_data); + } + else if (b0->current_data > 0) vlib_buffer_advance (b0, (word) - b0->current_data); pcap_add_buffer (&im->pcap_main, vm, bi0, 512); |