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selftests/bpf: Check dst_port only on the client socket

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cgroup_skb/egress programs which sock_fields test installs process packets
flying in both directions, from the client to the server, and in reverse
direction.

Recently added dst_port check relies on the fact that destination
port (remote peer port) of the socket which sends the packet is known ahead
of time. This holds true only for the client socket, which connects to the
known server port.

Filter out any traffic that is not egressing from the client socket in the
BPF program that tests reading the dst_port.

Fixes: 8f50f16ff3 ("selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads")
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220317113920.1068535-3-jakub@cloudflare.com
This commit is contained in:
Jakub Sitnicki 2022-03-17 12:39:18 +01:00 committed by Daniel Borkmann
parent a4c9fe0ed4
commit 2d2202ba85
1 changed files with 4 additions and 0 deletions
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4
tools/testing/selftests/bpf/progs/test_sock_fields.c
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@ -281,6 +281,10 @@ int read_sk_dst_port(struct __sk_buff *skb)
if (!sk)
RET_LOG();
/* Ignore everything but the SYN from the client socket */
if (sk->state != BPF_TCP_SYN_SENT)
return CG_OK;
if (!sk_dst_port__load_word(sk))
RET_LOG();
if (!sk_dst_port__load_half(sk))