netdev - [PATCH net-next v2] net: ipv6: Generate random IID for addresses on RAWIP devices

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Date:   Mon,  4 Jun 2018 19:26:07 -0600
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     davem@...emloft.net, netdev@...r.kernel.org,
        yoshfuji@...ux-ipv6.org
Cc:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Sean Tranchetti <stranche@...eaurora.org>
Subject: [PATCH net-next v2] net: ipv6: Generate random IID for addresses on RAWIP devices

RAWIP devices such as rmnet do not have a hardware address and
instead require the kernel to generate a random IID for the
IPv6 addresses.

Signed-off-by: Sean Tranchetti <stranche@...eaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>

---
v1->v2: Yoshfuji suggested to update the I/G and G/L bit.
Similar functionality is already implemented by addrconf_ifid_ip6tnl()
so use it.
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c | 4 ++++
 net/ipv6/addrconf.c                             | 4 +++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
index cb02e1a..b9a7548 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
@@ -221,6 +221,10 @@ void rmnet_vnd_setup(struct net_device *rmnet_dev)
 
 	rmnet_dev->needs_free_netdev = true;
 	rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
+
+	/* This perm addr will be used as interface identifier by IPv6 */
+	rmnet_dev->addr_assign_type = NET_ADDR_RANDOM;
+	eth_random_addr(rmnet_dev->perm_addr);
 }
 
 /* Exposed API */
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index f09afc2..5596d87 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2251,6 +2251,7 @@ static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
 		return addrconf_ifid_ieee1394(eui, dev);
 	case ARPHRD_TUNNEL6:
 	case ARPHRD_IP6GRE:
+	case ARPHRD_RAWIP:
 		return addrconf_ifid_ip6tnl(eui, dev);
 	}
 	return -1;
@@ -3286,7 +3287,8 @@ static void addrconf_dev_config(struct net_device *dev)
 	    (dev->type != ARPHRD_IP6GRE) &&
 	    (dev->type != ARPHRD_IPGRE) &&
 	    (dev->type != ARPHRD_TUNNEL) &&
-	    (dev->type != ARPHRD_NONE)) {
+	    (dev->type != ARPHRD_NONE) &&
+	    (dev->type != ARPHRD_RAWIP)) {
 		/* Alas, we support only Ethernet autoconfiguration. */
 		return;
 	}
-- 
1.9.1