[PATCH net-next 2/2] net: ipv6: don't generate link local address on PUREIP device

[Rocco Yue]

PUREIP device such as ccmni does not need kernel to generate
link-local address in any addr_gen_mode, generally, it shall
use the IPv6 Interface Identifier, as provided by the GGSN,
to create its IPv6 link-ocal Unicast Address.

Signed-off-by: Rocco Yue <rocco....@mediatek.com>
---
 net/ipv6/addrconf.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 9edc5bb2d531..5e8134d3e704 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3337,7 +3337,8 @@ static void addrconf_dev_config(struct net_device *dev)
            (dev->type != ARPHRD_IPGRE) &&
            (dev->type != ARPHRD_TUNNEL) &&
            (dev->type != ARPHRD_NONE) &&
-           (dev->type != ARPHRD_RAWIP)) {
+           (dev->type != ARPHRD_RAWIP) &&
+           (dev->type != ARPHRD_PUREIP)) {
                /* Alas, we support only Ethernet autoconfiguration. */
                idev = __in6_dev_get(dev);
                if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
@@ -3350,6 +3351,12 @@ static void addrconf_dev_config(struct net_device *dev)
        if (IS_ERR(idev))
                return;
 
+       /* this device type doesn't need to generate
+        * link-local address in any addr_gen_mode
+        */
+       if (dev->type == ARPHRD_PUREIP)
+               return;
+
        /* this device type has no EUI support */
        if (dev->type == ARPHRD_NONE &&
            idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
-- 
2.18.0