diff options
| -rw-r--r-- | pcap-linux.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/pcap-linux.c b/pcap-linux.c index de21cd43..b558e459 100644 --- a/pcap-linux.c +++ b/pcap-linux.c @@ -4243,6 +4243,13 @@ static int pcap_handle_packet_mmap( * * Trim the snapshot length to be no longer than the * specified snapshot length. + * + * XXX - an alternative is to put a filter, consisting + * of a "ret <snaplen>" instruction, on the socket + * in the activate routine, so that the truncation is + * done in the kernel even if nobody specified a filter; + * that means that less buffer space is consumed in + * the memory-mapped buffer. */ if (pcaphdr.caplen > (bpf_u_int32)handle->snapshot) pcaphdr.caplen = handle->snapshot; |