Commit 51199405 authored Dec 20, 2018 by John Fastabend Committed by Daniel Borkmann Dec 20, 2018

bpf: skb_verdict, support SK_PASS on RX BPF path



Add SK_PASS verdict support to SK_SKB_VERDICT programs. Now that
support for redirects exists we can implement SK_PASS as a redirect
to the same socket. This simplifies the BPF programs and avoids an
extra map lookup on RX path for simple visibility cases.

Further, reduces user (BPF programmer in this context) confusion
when their program drops skb due to lack of support.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent 7a69c0f2

net/core/skmsg.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -669,6 +669,22 @@ static void sk_psock_verdict_apply(struct sk_psock *psock,
		bool ingress;

		switch (verdict) {
		case __SK_PASS:
		sk_other = psock->sk;
		if (sock_flag(sk_other, SOCK_DEAD) \|\|
		!sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) {
		goto out_free;
		}
		if (atomic_read(&sk_other->sk_rmem_alloc) <=
		sk_other->sk_rcvbuf) {
		struct tcp_skb_cb *tcp = TCP_SKB_CB(skb);

		tcp->bpf.flags \|= BPF_F_INGRESS;
		skb_queue_tail(&psock->ingress_skb, skb);
		schedule_work(&psock->work);
		break;
		}
		goto out_free;
		case __SK_REDIRECT:
		sk_other = tcp_skb_bpf_redirect_fetch(skb);
		if (unlikely(!sk_other))