tun: unbreak truncated packet signalling
Commit 6680ec68eff47d36f67b4351bc9836fd6cba9532
(tuntap: hardware vlan tx support) breaks the truncated packet signal by never
return a length greater than iov length in tun_put_user(). This patch fixes this
by always return the length of packet plus possible vlan header. Caller can
detect the truncated packet by comparing the return value and the size of iov
length.
Reported-by: Vlad Yasevich <vyasevich@gmail.com>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e26cbea..dd1bd7a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1183,7 +1183,11 @@
const struct iovec *iv, int len)
{
struct tun_pi pi = { 0, skb->protocol };
- ssize_t total = 0;
+ struct {
+ __be16 h_vlan_proto;
+ __be16 h_vlan_TCI;
+ } veth;
+ ssize_t total = 0, off = 0;
int vlan_offset = 0;
if (!(tun->flags & TUN_NO_PI)) {
@@ -1248,14 +1252,11 @@
total += tun->vnet_hdr_sz;
}
+ off = total;
if (!vlan_tx_tag_present(skb)) {
len = min_t(int, skb->len, len);
} else {
int copy, ret;
- struct {
- __be16 h_vlan_proto;
- __be16 h_vlan_TCI;
- } veth;
veth.h_vlan_proto = skb->vlan_proto;
veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb));
@@ -1264,22 +1265,22 @@
len = min_t(int, skb->len + VLAN_HLEN, len);
copy = min_t(int, vlan_offset, len);
- ret = skb_copy_datagram_const_iovec(skb, 0, iv, total, copy);
+ ret = skb_copy_datagram_const_iovec(skb, 0, iv, off, copy);
len -= copy;
- total += copy;
+ off += copy;
if (ret || !len)
goto done;
copy = min_t(int, sizeof(veth), len);
- ret = memcpy_toiovecend(iv, (void *)&veth, total, copy);
+ ret = memcpy_toiovecend(iv, (void *)&veth, off, copy);
len -= copy;
- total += copy;
+ off += copy;
if (ret || !len)
goto done;
}
- skb_copy_datagram_const_iovec(skb, vlan_offset, iv, total, len);
- total += len;
+ skb_copy_datagram_const_iovec(skb, vlan_offset, iv, off, len);
+ total += skb->len + (vlan_offset ? sizeof(veth) : 0);
done:
tun->dev->stats.tx_packets++;