[IPV6]: ROUTE: Add router_probe_interval sysctl.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 22 insertions, 1 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 87bbd774c2b2..88efed0a533f 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -789,6 +789,12 @@ mtu - INTEGER
         Default Maximum Transfer Unit
         Default: 1280 (IPv6 required minimum)
 
+router_probe_interval - INTEGER
+        Minimum interval (in seconds) between Router Probing described
+        in RFC4191.
+
+        Default: 60
+
 router_solicitation_delay - INTEGER
         Number of seconds to wait after interface is brought up
         before sending Router Solicitations.
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 108b75dccd9f..c609cc702375 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -149,6 +149,7 @@ struct ipv6_devconf {
         __s32           accept_ra_pinfo;
 #ifdef CONFIG_IPV6_ROUTER_PREF
         __s32           accept_ra_rtr_pref;
+        __s32           rtr_probe_interval;
 #endif
         void            *sysctl;
 };
@@ -175,6 +176,7 @@ enum {
         DEVCONF_ACCEPT_RA_DEFRTR,
         DEVCONF_ACCEPT_RA_PINFO,
         DEVCONF_ACCEPT_RA_RTR_PREF,
+        DEVCONF_RTR_PROBE_INTERVAL,
         DEVCONF_MAX
 };
 
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 236f537b38d2..f49488ffefef 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -534,6 +534,7 @@ enum {
         NET_IPV6_ACCEPT_RA_DEFRTR=18,
         NET_IPV6_ACCEPT_RA_PINFO=19,
         NET_IPV6_ACCEPT_RA_RTR_PREF=20,
+        NET_IPV6_RTR_PROBE_INTERVAL=21,
         __NET_IPV6_MAX
 };
 
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 51edba5fea26..e7add61e6e39 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -169,6 +169,7 @@ struct ipv6_devconf ipv6_devconf = {
         .accept_ra_pinfo        = 1,
 #ifdef CONFIG_IPV6_ROUTER_PREF
         .accept_ra_rtr_pref     = 1,
+        .rtr_probe_interval     = 60 * HZ,
 #endif
 };
 
@@ -195,6 +196,7 @@ static struct ipv6_devconf ipv6_devconf_dflt = {
         .accept_ra_pinfo        = 1,
 #ifdef CONFIG_IPV6_ROUTER_PREF
         .accept_ra_rtr_pref     = 1,
+        .rtr_probe_interval     = 60 * HZ,
 #endif
 };
 
@@ -3130,6 +3132,7 @@ static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
 #ifdef CONFIG_IPV6_ROUTER_PREF
         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
+        array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
 #endif
 }
 
@@ -3608,6 +3611,15 @@ static struct addrconf_sysctl_table
                         .mode           =       0644,
                         .proc_handler   =       &proc_dointvec,
                 },
+                {
+                        .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
+                        .procname       =       "router_probe_interval",
+                        .data           =       &ipv6_devconf.rtr_probe_interval,
+                        .maxlen         =       sizeof(int),
+                        .mode           =       0644,
+                        .proc_handler   =       &proc_dointvec_jiffies,
+                        .strategy       =       &sysctl_jiffies,
+                },
 #endif
                 {
                         .ctl_name       =       0,      /* sentinel */
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 8ba8900c0a5f..c797b9bbb7d1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -234,7 +234,7 @@ static void rt6_probe(struct rt6_info *rt)
                 return;
         read_lock_bh(&neigh->lock);
         if (!(neigh->nud_state & NUD_VALID) &&
-            time_after(jiffies, neigh->updated + 60 * HZ)) {
+            time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
                 struct in6_addr mcaddr;
                 struct in6_addr *target;