[PATCH v5 0/3] dhcp: Add support for Rapid Commit, broadcast replies

[Stefano Brivio <sbrivio@redhat.com>]

These are all changes coming from pending muvm experiments where I'm
trying to speed up and simplify the networking setup in the guest.

v5: In 2/3, keep the condition:
      (opts[53].clen <= 0 || opts[53].c[0] == DHCPREQUEST)
    as it was, instead of replacing || with &&

v4: In 1/3, don't swap the "BOOTP" and "DHCP" labels: we want to print
    "BOOTP" if option 53 isn't there or has zero length, not the other
    way around. Further, check that clen for option 53 is > 0 before
    checking if it's a DHCPDISCOVER. Given that DHCPDISCOVER is 1 (not
    0), this happened to already work for BOOTP, but it worked by
    mistake

v3: In 1/3, set 'slen' for options we won't send to -1 in dhcp_init(),
    and reset it for option 80 every time we handle a DHCP request. Add
    a comment about DHCP needing a valid message type (option 53)

v2: In 3/3, add in4addr_broadcast to ip.h, instead of open-coding it in
    dhcp()

Stefano Brivio (3):
  dhcp: Use -1 as "missing option" length instead of 0
  dhcp: Introduce support for Rapid Commit (option 80, RFC 4039)
  dhcp: Honour broadcast flag (RFC 2131, 4.1)

 dhcp.c | 53 +++++++++++++++++++++++++++++++++++++++++------------
 ip.h   |  3 +++
 2 files changed, 44 insertions(+), 12 deletions(-)

-- 
2.43.0