CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2020/06/18 17:27:58
Modified files:
sys/net : bpf.c bpf.h
Log message:
extend the bpf_hdr struct to include some metadata if available.
the metadata is set if the mbuf is passed with an m_pktrhdr, and
copies the mbufs rcvif, priority, flowid. it also carries the
direction of the packet.
it also makes bpf_hdr a multiple of 4 bytes, which simplifies some
calculations a bit. it also requires no changes in userland because
libpcap just thinks the extra bytes in the header are padding and
skips over them to the payload.
this helps me verify things like whether the stack and a network
card agree about toeplitz hashes, and paves the way for doing more
interesting packet captures. being able to see where a packet came
from as it is leaving a machine is very useful.
ok mpi@
