From 0f75b09c798ed00c30d7d5551b896be883bc2aeb Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Fri, 2 Aug 2013 11:37:39 +0200 Subject: [PATCH] af_packet: when sending ethernet frames, parse header for skb->protocol This may be necessary when the SKB is passed to other layers on the go, which check the protocol field on their own. An example is a VLAN packet sent out using AF_PACKET on a bridge interface. The bridging code checks the SKB size, accounting for any VLAN header only if the protocol field is set accordingly. Note that eth_type_trans() sets skb->dev to the passed argument, so this can be skipped in packet_snd() for ethernet frames, as well. Signed-off-by: Phil Sutter Signed-off-by: David S. Miller --- net/packet/af_packet.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 4cb28a7f639b..71db35ecba39 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -88,6 +88,7 @@ #include #include #include +#include #ifdef CONFIG_INET #include @@ -2005,6 +2006,9 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, if (unlikely(err)) return err; + if (dev->type == ARPHRD_ETHER) + skb->protocol = eth_type_trans(skb, dev); + data += dev->hard_header_len; to_write -= dev->hard_header_len; } @@ -2324,6 +2328,13 @@ static int packet_snd(struct socket *sock, sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); + if (dev->type == ARPHRD_ETHER) { + skb->protocol = eth_type_trans(skb, dev); + } 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 @@ -2338,8 +2349,6 @@ static int packet_snd(struct socket *sock, } } - skb->protocol = proto; - skb->dev = dev; skb->priority = sk->sk_priority; skb->mark = sk->sk_mark; -- 2.20.1