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

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Date:   Thu, 28 Jan 2021 13:58:09 +0800
From:   Rocco Yue <rocco.yue@...iatek.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        Rocco Yue <rocco.yue@...iatek.com>
Subject: [PATCH net-next 2/2] net: ipv6: don't generate link local address on PUREIP device

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.yue@...iatek.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