netdev - [PATCH 2/4] net: ipv6: don't generate link local address on PUREIP device

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Date:   Wed, 23 Jun 2021 19:34:50 +0800
From:   Rocco Yue <rocco.yue@...iatek.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>
CC:     <netdev@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <bpf@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, <chao.song@...iatek.com>,
        <zhuoliang.zhang@...iatek.com>, <kuohong.wang@...iatek.com>,
        Rocco Yue <rocco.yue@...iatek.com>
Subject: [PATCH 2/4] net: ipv6: don't generate link local address on PUREIP device

PUREIP device such as ccmni does not need kernel to generate
ipv6 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 701eb82acd1c..1bfa7eca1314 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3339,7 +3339,8 @@ 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 &&
@@ -3352,6 +3353,12 @@ 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