[PATCH v2 0/8] ndp: Unsolicited RAs

[David Gibson <david@gibson.dropbear.id.au>]

The default route a guest obtains via NDP has an expiry.  We set this
to the maximum allowed, 65535s (about 18 hours).  We missed, however,
that after that expiry, the guest won't send a new Router
Solicitation.  Instead it expects an unsolicited Router Advertisement
to have come at some point before the expiry.  This means that on an
IPv6 setup, the default will disappear after 18 hours.

Correct this by sending unsolicited Router Advertisements as required
by RFC 4861.  Along the way we make a number of small cleanups to the
NDP code.

Link: https://github.com/kubevirt/kubevirt/issues/13191

v2:
 * Some minor stylistic fixes
 * Use srandom()
 * Better explanation of the random requirements for the RAs

David Gibson (8):
  ndp: Remove redundant update to addr_seen
  ndp: Add ndp_send() helper
  ndp: Split out helpers for sending specific NDP message types
  ndp: Use struct assignment in preference to memcpy() for IPv6
    addresses
  ndp: Make route lifetime a #define
  util: Add general low-level random bytes helper
  passt: Seed libc's pseudo random number generator
  ndp: Send unsolicited Router Advertisements

 ip.h    |   9 +++
 ndp.c   | 219 +++++++++++++++++++++++++++++++++++++-------------------
 ndp.h   |   7 +-
 passt.c |  42 ++++-------
 util.c  |  54 ++++++++++++++
 util.h  |   2 +
 6 files changed, 228 insertions(+), 105 deletions(-)

-- 
2.47.0