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-rw-r--r--src/vnet/interface_output.c13
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);