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Commit 956fe219 authored by brakmo's avatar brakmo Committed by Alexei Starovoitov
Browse files

bpf: Update BPF_CGROUP_RUN_PROG_INET_EGRESS calls 



Update BPF_CGROUP_RUN_PROG_INET_EGRESS() callers to support returning
congestion notifications from the BPF programs.

Signed-off-by: default avatarLawrence Brakmo <brakmo@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent e7a3160d

net/ipv4/ip_output.c

+23 −11
Original line number Diff line number Diff line
@@ -287,16 +287,9 @@ static int ip_finish_output_gso(struct net *net, struct sock *sk, 
	return ret;

}



static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)

static int __ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)

{

	unsigned int mtu;

	int ret;



	ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);

	if (ret) {

		kfree_skb(skb);

		return ret;

	}



#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM)

	/* Policy lookup after SNAT yielded a new policy */
@@ -315,18 +308,37 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk 
	return ip_finish_output2(net, sk, skb);

}



static int ip_mc_finish_output(struct net *net, struct sock *sk,

			       struct sk_buff *skb)

static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)

{

	int ret;



	ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);

	if (ret) {

	switch (ret) {

	case NET_XMIT_SUCCESS:

		return __ip_finish_output(net, sk, skb);

	case NET_XMIT_CN:

		return __ip_finish_output(net, sk, skb) ? : ret;

	default:

		kfree_skb(skb);

		return ret;

	}

}



static int ip_mc_finish_output(struct net *net, struct sock *sk,

			       struct sk_buff *skb)

{

	int ret;



	ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);

	switch (ret) {

	case NET_XMIT_SUCCESS:

		return dev_loopback_xmit(net, sk, skb);

	case NET_XMIT_CN:

		return dev_loopback_xmit(net, sk, skb) ? : ret;

	default:

		kfree_skb(skb);

		return ret;

	}

}



int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb)

net/ipv6/ip6_output.c

+17 −9
Original line number Diff line number Diff line
@@ -128,16 +128,8 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff * 
	return -EINVAL;

}



static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)

static int __ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)

{

	int ret;



	ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);

	if (ret) {

		kfree_skb(skb);

		return ret;

	}



#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM)

	/* Policy lookup after SNAT yielded a new policy */

	if (skb_dst(skb)->xfrm) {
@@ -154,6 +146,22 @@ static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *s 
		return ip6_finish_output2(net, sk, skb);

}



static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb)

{

	int ret;



	ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);

	switch (ret) {

	case NET_XMIT_SUCCESS:

		return __ip6_finish_output(net, sk, skb);

	case NET_XMIT_CN:

		return __ip6_finish_output(net, sk, skb) ? : ret;

	default:

		kfree_skb(skb);

		return ret;

	}

}



int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)

{

	struct net_device *dev = skb_dst(skb)->dev;