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authorHangbin Liu <liuhangbin@gmail.com>2015-07-30 09:28:42 +0300
committerLuis Henriques <luis.henriques@canonical.com>2016-03-24 12:59:05 +0300
commitefd019f933a538e4147aee811e6b2dd7a1aafdef (patch)
tree0b2faba50264a68652f8eb599b29dcb051fe863d /tools/perf/builtin-annotate.c
parentc548b32aa079ef8276362277109cbd4b58bd202d (diff)
downloadlinux-efd019f933a538e4147aee811e6b2dd7a1aafdef.tar.xz
net/ipv6: add sysctl option accept_ra_min_hop_limit
commit 8013d1d7eafb0589ca766db6b74026f76b7f5cb4 upstream. Commit 6fd99094de2b ("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>
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