On Fri, Nov 14, 2014 at 11:29:50AM +0100, Alvaro Neira Ayuso wrote:
> This patch sets the pktinfo for IPv4/IPv6 traffic. Therefore, we can check the
> meta l4proto for IPv4/IPv6 traffic in bridge, before we don't have enough
> information to do it.
>
> Signed-off-by: Alvaro Neira Ayuso <alvaroneay@xxxxxxxxx>
> ---
> net/bridge/netfilter/nf_tables_bridge.c | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/net/bridge/netfilter/nf_tables_bridge.c b/net/bridge/netfilter/nf_tables_bridge.c
> index d468c19..0a0f0ca 100644
> --- a/net/bridge/netfilter/nf_tables_bridge.c
> +++ b/net/bridge/netfilter/nf_tables_bridge.c
> @@ -16,6 +16,8 @@
> #include <net/netfilter/nf_tables_bridge.h>
> #include <linux/ip.h>
> #include <linux/ipv6.h>
> +#include <net/netfilter/nf_tables_ipv4.h>
> +#include <net/netfilter/nf_tables_ipv6.h>
>
> int nft_bridge_iphdr_validate(struct sk_buff *skb)
> {
> @@ -71,8 +73,21 @@ nft_do_chain_bridge(const struct nf_hook_ops *ops,
> {
> struct nft_pktinfo pkt;
>
> - nft_set_pktinfo(&pkt, ops, skb, in, out);
> + switch (eth_hdr(skb)->h_proto) {
> + case htons(ETH_P_IP):
> + if (!nft_bridge_iphdr_validate(skb))
> + break;
> + nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
> + return nft_do_chain(&pkt, ops);
Please, clean up this, add this function:
static inline void nft_bridge_set_pktinfo_ipv4(...)
{
if (nft_bridge_iphdr_validate(skb))
nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
else
nft_set_pktinfo(&pkt, ops)
}
And use it.
> + case htons(ETH_P_IPV6):
> + if (!nft_bridge_ip6hdr_validate(skb))
> + break;
> + if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
> + break;
> + return nft_do_chain(&pkt, ops);
static inline void nft_bridge_set_pktinfo_ipv4(...)
{
#if IS_ENABLED(CONFIG_IPV6)
if (!nft_bridge_ip6hdr_validate(skb) ||
nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
nft_set_pktinfo(&pkt, ops);
#endif
}
And use it. The #if is needed because nft_set_pktinfo_ipv6 calls
ipv6_find_hdr() which may not be available if CONFIG_IPV6 is set.
Then, don't forget to:
return nft_do_chain(&pkt, ops);
so we only have one single out output path in this function.
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