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linux/include/uapi
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Hangbin Liu efd019f933 net/ipv6: add sysctl option accept_ra_min_hop_limit 
commit 8013d1d7ea upstream.

Commit 6fd99094de ("ipv6: Don't reduce hop limit for an interface")
disabled accept hop limit from RA if it is smaller than the current hop
limit for security stuff. But this behavior kind of break the RFC definition.

RFC 4861, 6.3.4.  Processing Received Router Advertisements
   A Router Advertisement field (e.g., Cur Hop Limit, Reachable Time,
   and Retrans Timer) may contain a value denoting that it is
   unspecified.  In such cases, the parameter should be ignored and the
   host should continue using whatever value it is already using.

   If the received Cur Hop Limit value is non-zero, the host SHOULD set
   its CurHopLimit variable to the received value.

So add sysctl option accept_ra_min_hop_limit to let user choose the minimum
hop limit value they can accept from RA. And set default to 1 to meet RFC
standards.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[ luis: backported to 3.16:
  - added missing DEVCONF_* as suggested by Yoshfuji so that uapi contains
    the same values as mainline
  - adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
History 2016-03-24 09:59:05 +00:00
..
asm-generic asm-generic: Add renameat2 syscall 2014-05-20 10:59:38 +02:00
drm xdrm/i915: Use two 32bit reads for select 64bit REG_READ ioctls 2015-08-11 09:57:37 +01:00
linux net/ipv6: add sysctl option accept_ra_min_hop_limit 2016-03-24 09:59:05 +00:00
mtd mtd: lpddr: add driver for LPDDR2-NVM PCM memories 2014-05-20 17:45:17 -07:00
rdma RDMA/uapi: Include socket.h in rdma_user_cm.h 2014-09-17 09:22:17 -07:00
scsi FCoE Updates for 3.9 2013-03-01 09:10:08 +00:00
sound ALSA: compress: fix the struct alignment to 4 bytes 2014-06-23 12:15:33 +02:00
video UAPI: (Scripted) Disintegrate include/video 2012-12-20 17:14:26 +00:00
xen xen: install xen/gntdev.h and xen/gntalloc.h 2014-02-11 10:12:36 -05:00
Kbuild UAPI: (Scripted) Set up UAPI Kbuild files 2012-10-02 18:01:35 +01:00