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).

Signed-off-by: Joel Scherpelz <jscherpelz@google.com>
Acked-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/uapi/linux/ipv6.h b/include/uapi/linux/ipv6.h
index d8f6a1ac9af4..2ae59178189d 100644
--- a/include/uapi/linux/ipv6.h
+++ b/include/uapi/linux/ipv6.h
@@ -184,6 +184,7 @@ enum {
         DEVCONF_ENHANCED_DAD,
         DEVCONF_ADDR_GEN_MODE,
         DEVCONF_DISABLE_POLICY,
+        DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN,
         DEVCONF_MAX
 };
 
diff --git a/include/uapi/linux/sysctl.h b/include/uapi/linux/sysctl.h
index d2b12152e358..e13d48058b8d 100644
--- a/include/uapi/linux/sysctl.h
+++ b/include/uapi/linux/sysctl.h
@@ -568,6 +568,7 @@ enum {
         NET_IPV6_PROXY_NDP=23,
         NET_IPV6_ACCEPT_SOURCE_ROUTE=25,
         NET_IPV6_ACCEPT_RA_FROM_LOCAL=26,
+        NET_IPV6_ACCEPT_RA_RT_INFO_MIN_PLEN=27,
         __NET_IPV6_MAX
 };