`od_hex_dump()` is called if `hdr_len < pkt->size` to print the rest
after `hdr_len` of `pkt`. So if we just leave `hdr_len = 0` instead of
calling `od_hex_dump()` for every other NETTYPE, we achieve the same
effect.
As it is more effective (and already done in some cases) to re-set
`hdr_len` when the header was printed, we initialize `hdr_len` first
with 0 now.
With multiple 6LoWPAN interfaces the router for the given interface
—the one the triggering RA came over—should be used to register the
address with.
Co-Authored-By: Benjamin Valentin <benpicco@googlemail.com>
Enabled by the gnrc_netif_events pseudo module. Using an internal event
loop within the gnrc_netif thread eliminates the risk of lost interrupts
and lets ISR events always be handled before any send/receive requests
from other threads are processed.
The events in the event loop is also a potential hook for MAC layers and
other link layer modules which may need to inject and process events
before any external IPC messages are handled.
Co-Authored-By: Koen Zandberg <koen@bergzand.net>
The termination condition implemented in gnrc_pktbuf_malloc does not
work when using the sock interface as sock copies packet data to a local
buffer and frees the packet afterwards. As such, the fuzzing application
would exit before performing any input processing.
For this reason, the termination condition in gnrc_pktbuf_malloc is
disabled when using sock. Instead, the application terminates if
gnrc_sock_recv previously returned the fuzzing packet. The underlying
assumption of this implementation is that gnrc_sock_recv is called in a
loop.
Since RIOT is an operating system the native binary will never terminate
[0]. The termination condition for fuzzing GNRC is that the packet was
handled by the network stack and therefore freed. If it is never freed
we will deadlock meaning a memory leak was found, afl should be able to
detect this through timeouts.
This is currently only supported for gnrc_pktbuf_malloc since this is
the pktbuf implementation I used for fuzzing. Implementing this in
pktbuf.h is not possible.
[0]: Except NATIVE_AUTO_EXIT is defined, however, even with that define
set RIOT will only terminate when all threads terminated. Unfortunately,
gnrc_udp and other network threads will never terminate.
