CVSROOT: /cvs
Module name: src
Changes by: d...@cvs.openbsd.org 2022/02/04 21:08:27
Modified files:
sys/net : bpf.c
Log message:
make bpf_movein align the packet payload.
bluhm@ hit a problem while running a regress test where a packet
generated and injected via bpf ends up being consumed by the network
stack. the stack assumes that packets are aligned properly, but bpf
was lazy and put whatever was written to it at the start of an mbuf.
ethernet has a 14 byte header, so if you put that at the start the
payload will be misaligned by 2 bytes.
bpf already has handling for different link header types, so this
handling is extended a bit to align the payload after the link
header.
while here we're fixing up a few error codes. short packets produce
EINVAL instead of EPERM, and packets larger than the biggest mbuf
the kernel supports generates EMSGSIZE.
with tweaks and ok bluhm@
