ipv6 addrconf: disallow rtr_solicits < -1
This disallows setting /proc/sys/net/ipv6/conf/*/router_solicitations
to values below -1.
-1 continues to mean an unlimited number of retransmits.
Note: this depends on 'ipv6 addrconf: remove addrconf_sysctl_hop_limit()'
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index cbd9343..d8983e1 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5729,6 +5729,7 @@
return ret;
}
+static int minus_one = -1;
static const int one = 1;
static const int two_five_five = 255;
@@ -5789,7 +5790,8 @@
.data = &ipv6_devconf.rtr_solicits,
.maxlen = sizeof(int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &minus_one,
},
{
.procname = "router_solicitation_interval",