From: Sabrina Dubroca <sd@queasysnail.net>
Subject: net/ipv6: propagate net.ipv6.conf.all.addr_gen_mode to
 devices
Patch-mainline: v4.19-rc1
Git-commit: f24c5987dddd28b23443e7b21b55d47549207755 
References: git-fixes

This aligns the addr_gen_mode sysctl with the expected behavior of the
"all" variant.

Fixes: d35a00b8e33d ("net/ipv6: allow sysctl to change link-local address generation mode")
Suggested-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Denis Kirjanov <dkirjanov@suse.com>
---
 net/ipv6/addrconf.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index bbe616f991e9..106da7d7052b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5824,6 +5824,18 @@ static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
 				idev->cnf.addr_gen_mode = new_val;
 				addrconf_dev_config(idev->dev);
 			}
+		} else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
+			struct net_device *dev;
+
+			net->ipv6.devconf_dflt->addr_gen_mode = new_val;
+			for_each_netdev(net, dev) {
+				idev = __in6_dev_get(dev);
+				if (idev &&
+				    idev->cnf.addr_gen_mode != new_val) {
+					idev->cnf.addr_gen_mode = new_val;
+					addrconf_dev_config(idev->dev);
+				}
+			}
 		}
 
 		*((u32 *)ctl->data) = new_val;
-- 
2.12.3