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af_packet: simplify VLAN frame check in packet_snd

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For ethernet frames, eth_type_trans() already parses the header, so one
can skip this when checking the frame size.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Phil Sutter 2013-08-02 11:37:41 +02:00 committed by David S. Miller
parent cbd89acb9e
commit c483e02614
1 changed files with 4 additions and 11 deletions
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15
net/packet/af_packet.c
View file

@ -2333,23 +2333,16 @@ static int packet_snd(struct socket *sock,
if (dev->type == ARPHRD_ETHER) {
skb->protocol = eth_type_trans(skb, dev);
if (skb->protocol == htons(ETH_P_8021Q))
reserve += VLAN_HLEN;
} else {
skb->protocol = proto;
skb->dev = dev;
}
if (!gso_type && (len > dev->mtu + reserve + extra_len)) {
/* Earlier code assumed this would be a VLAN pkt,
* double-check this now that we have the actual
* packet in hand.
*/
struct ethhdr *ehdr;
skb_reset_mac_header(skb);
ehdr = eth_hdr(skb);
if (ehdr->h_proto != htons(ETH_P_8021Q)) {
err = -EMSGSIZE;
goto out_free;
}
err = -EMSGSIZE;
goto out_free;
}
skb->priority = sk->sk_priority;