Fix the handling of IPv6 On-Link Redirects.

On receipt of a redirect message, install an interface route for the
redirected destination.  On removal of the corresponding Neighbor Cache
entry, remove the interface route.

This requires changes in rtredirect_fib() to cope with an AF_LINK
address for the gateway and with the absence of RTF_GATEWAY.

This fixes the "Redirected On-Link" test cases in the Tahi IPv6 Ready Logo
Phase 2 test suite.

Unrelated to the above, fix a recursion on the radix node head lock
triggered by the Tahi Redirected to Alternate Router test cases.

When I first wrote this patch in October 2012, all Section 2
(Neighbor Discovery) test cases passed on 10-CURRENT, 9-STABLE,
and 8-STABLE.  cem@ recently rebased the 10.x patch onto head and reported
that it passes Tahi.  (Thanks!)

These other test cases also passed in 2012:

* the RTF_MODIFIED case, with IPv4 and IPv6 (using a
  RTF_HOST|RTF_GATEWAY route for the destination)

* the redirected-to-self case, with IPv4 and IPv6

* a valid IPv4 redirect

All testing in 2012 was done with WITNESS and INVARIANTS.

Tested by:    EMC / Isilon Storage Division via Conrad Meyer (cem) in 2015,
              Mark Kelley <mark_kelley@dell.com> in 2012,
              TC Telkamp <terence_telkamp@dell.com> in 2012
PR:           152791
Reviewed by:  melifaro (current rev), bz (earlier rev)
Approved by:  kib (mentor)
MFC after:    1 month
Relnotes:     yes
Sponsored by: Dell Inc.
Differential Revision: https://reviews.freebsd.org/D3602

0 files changed, 0 insertions, 0 deletions