plan9fox/sys
cinap_lenrek d43d79bda4 devip: implement ipv4 arp timeout with icmp host unreachable notification
The IPv4 ARP cache used to indefinitely buffer packets in the Arpent hold list.
This is bad in case of a router, because it opens a 1 second
(retransmit time) window to leak all the to be forwarded packets.

This change makes the ipv4 arp code path similar to the IPv6 neighbour
solicitation path, using the retransmit process to time out old entries
(after 3 arp retransmits => 3 seconds).

A new function arpcontinue() has been added that unifies the point when
we schedule the (ipv6 sol retransmit) / (ipv4 arp timeout) and reduce
the hold queue to the last packet and unlock the cache.

As a bonus, we also now send a icmp host unreachable notification
for the dropped packets.
2021-09-26 18:43:29 +00:00
..
doc
games/lib fortunes: unremove 2021-07-08 15:47:49 +00:00
include qsort: ...forgot to include headers in the commit. 2021-08-11 13:10:14 +00:00
lib /sys/lib/acid/pool: format addresses using A format, instead of X (32 bit) 2021-09-25 14:51:23 +00:00
man plumber: remove $plumbsrv, add optional srvname, usage check 2021-09-10 21:03:47 +00:00
src devip: implement ipv4 arp timeout with icmp host unreachable notification 2021-09-26 18:43:29 +00:00