netdev - [PATCH] CAIF: Fix IPv6 support in receive path for GPRS/3G

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Date:	Fri, 07 Jan 2011 12:57:08 +0100
From:	Sjur Brændeland <sjurbren@...ricsson.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
Cc:	Kumar Sanghvi <kumar.sanghvi@...ricsson.com>,
	Sjur Braendeland <sjur.brandeland@...ricsson.com>
Subject: [PATCH] CAIF: Fix IPv6 support in receive path for GPRS/3G

From: Kumar Sanghvi <kumar.sanghvi@...ricsson.com>

Checks version field of IP in the receive path for GPRS/3G data
and appropriately sets the value of skb->protocol.

Signed-off-by: Sjur Braendeland <sjur.brandeland@...ricsson.com>
---
 net/caif/chnl_net.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/net/caif/chnl_net.c b/net/caif/chnl_net.c
index 84a422c..fa9dab3 100644
--- a/net/caif/chnl_net.c
+++ b/net/caif/chnl_net.c
@@ -76,6 +76,8 @@ static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
 	struct chnl_net *priv  = container_of(layr, struct chnl_net, chnl);
 	int pktlen;
 	int err = 0;
+	const u8 *ip_version;
+	u8 buf;
 
 	priv = container_of(layr, struct chnl_net, chnl);
 
@@ -90,7 +92,21 @@ static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
 	 * send the packet to the net stack.
 	 */
 	skb->dev = priv->netdev;
-	skb->protocol = htons(ETH_P_IP);
+
+	/* check the version of IP */
+	ip_version = skb_header_pointer(skb, 0, 1, &buf);
+	if (!ip_version)
+		return -EINVAL;
+	switch (*ip_version >> 4) {
+	case 4:
+		skb->protocol = htons(ETH_P_IP);
+		break;
+	case 6:
+		skb->protocol = htons(ETH_P_IPV6);
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	/* If we change the header in loop mode, the checksum is corrupted. */
 	if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
-- 
1.7.0.4

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