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Commit e5433b1d authored by Joel Scherpelz's avatar Joel Scherpelz
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net: ipv6: Add sysctl for minimum prefix len acceptable in RIOs.


This commit adds a new sysctl accept_ra_rt_info_min_plen that
defines the minimum acceptable prefix length of Route Information
Options. The new sysctl is intended to be used together with
accept_ra_rt_info_max_plen to configure a range of acceptable
prefix lengths. It is useful to prevent misconfigurations from
unintentionally blackholing too much of the IPv6 address space
(e.g., home routers announcing RIOs for fc00::/7, which is
incorrect).

Backport of net-next commit bbea124bc99d ("net: ipv6: Add sysctl for minimum prefix len acceptable in RIOs.")

[lorenzo@google.com: fixed conflicts in include/uapi/linux/ipv6.h]
Bug: 33333670
Test: net_test passes

Signed-off-by: default avatarJoel Scherpelz <jscherpelz@google.com>
Acked-by: default avatarLorenzo Colitti <lorenzo@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e1540e3e
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