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authorAng Way Chuang <wcang@nav6.org>2008-06-18 00:10:33 -0400
committerDavid S. Miller <davem@davemloft.net>2008-06-18 00:10:33 -0400
commitf09f7ee20c867818bacf79426cf491b2749e7eff (patch)
treec570f7385827241c45dae25611759b0909ede9ce /drivers
parentfe833fca2eac6b3d3ad5e35f44ad4638362f1da8 (diff)
tun: Proper handling of IPv6 header in tun driver when TUN_NO_PI is set
By default, tun.c running in TUN_TUN_DEV mode will set the protocol of packet to IPv4 if TUN_NO_PI is set. My program failed to work when I assumed that the driver will check the first nibble of packet, determine IP version and set the appropriate protocol. Signed-off-by: Ang Way Chuang <wcang@nav6.org> Acked-by: Max Krasnyansky <maxk@qualcomm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/tun.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 0ce07a339c7e..7ab94c825b57 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -313,6 +313,21 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv,
313 313
314 switch (tun->flags & TUN_TYPE_MASK) { 314 switch (tun->flags & TUN_TYPE_MASK) {
315 case TUN_TUN_DEV: 315 case TUN_TUN_DEV:
316 if (tun->flags & TUN_NO_PI) {
317 switch (skb->data[0] & 0xf0) {
318 case 0x40:
319 pi.proto = htons(ETH_P_IP);
320 break;
321 case 0x60:
322 pi.proto = htons(ETH_P_IPV6);
323 break;
324 default:
325 tun->dev->stats.rx_dropped++;
326 kfree_skb(skb);
327 return -EINVAL;
328 }
329 }
330
316 skb_reset_mac_header(skb); 331 skb_reset_mac_header(skb);
317 skb->protocol = pi.proto; 332 skb->protocol = pi.proto;
318 skb->dev = tun->dev; 333 skb->dev = tun->dev;