netdev - [PATCH] af_packet: account for VLAN when checking packet size

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Date:	Mon, 11 Oct 2010 15:25:22 +0200
From:	Phil Sutter <phil@....cc>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, johann.baudy@...-log.net,
	eric.dumazet@...il.com
Subject: [PATCH] af_packet: account for VLAN when checking packet size

Signed-off-by: Phil Sutter <phil@....cc>
---
 net/packet/af_packet.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 9a17f28..ad37754 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -56,6 +56,7 @@
 #include <linux/in.h>
 #include <linux/inet.h>
 #include <linux/netdevice.h>
+#include <linux/if_arp.h>
 #include <linux/if_packet.h>
 #include <linux/wireless.h>
 #include <linux/kernel.h>
@@ -983,6 +984,11 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
 
 	reserve = dev->hard_header_len;
 
+	/* allow VLAN packets when device supports them */
+	if (likely(dev->type == ARPHRD_ETHER) &&
+	    likely(!(dev->features & NETIF_F_VLAN_CHALLENGED)))
+		reserve += VLAN_HLEN;
+
 	err = -ENETDOWN;
 	if (unlikely(!(dev->flags & IFF_UP)))
 		goto out_put;
-- 
1.7.2.2

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