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ipv4: ip_forward: perform skb->pkt_type check at the beginning 

Packets which have L2 address different from ours should be
already filtered before entering into ip_forward().

Perform that check at the beginning to avoid processing such packets.

Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis Kirjanov 2014-02-13 08:58:56 +04:00 committed by David S. Miller
parent 2045ceaed4
commit d4f2fa6ad6
1 changed files with 4 additions and 3 deletions
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7
net/ipv4/ip_forward.c
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@ -59,6 +59,10 @@ int ip_forward(struct sk_buff *skb)
struct rtable *rt; /* Route we use */ struct rtable *rt; /* Route we use */
struct ip_options *opt = &(IPCB(skb)->opt); struct ip_options *opt = &(IPCB(skb)->opt);
/* that should never happen */
if (skb->pkt_type != PACKET_HOST)
goto drop;
if (skb_warn_if_lro(skb)) if (skb_warn_if_lro(skb))
goto drop; goto drop;
@ -68,9 +72,6 @@ int ip_forward(struct sk_buff *skb)
if (IPCB(skb)->opt.router_alert && ip_call_ra_chain(skb)) if (IPCB(skb)->opt.router_alert && ip_call_ra_chain(skb))
return NET_RX_SUCCESS; return NET_RX_SUCCESS;
if (skb->pkt_type != PACKET_HOST)
goto drop;
skb_forward_csum(skb); skb_forward_csum(skb);
/* /*