On Thu, Nov 17, 2016 at 07:27:08PM +0100, Daniel Mack wrote:
[...]
> @@ -312,6 +314,12 @@ int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb)
> skb->dev = dev;
> skb->protocol = htons(ETH_P_IP);
>
> + ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);
> + if (ret) {
> + kfree_skb(skb);
> + return ret;
> + }
> +
> /*
> * Multicasts are looped back for other local users
> */
> @@ -364,12 +372,19 @@ int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb)
> int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb)
> {
> struct net_device *dev = skb_dst(skb)->dev;
> + int ret;
>
> IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
>
> skb->dev = dev;
> skb->protocol = htons(ETH_P_IP);
>
> + ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);
> + if (ret) {
> + kfree_skb(skb);
> + return ret;
> + }
> +
> return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
> net, sk, skb, NULL, dev,
> ip_finish_output,
Please, place this after the netfilter hook.
Since this new hook may mangle output packets, any mangling
potentially interfers and breaks conntrack.
Thank you.
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