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selftest/bpf: Use bpf_sk_lookup_{tcp, udp} in test_sock_addr

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Use bpf_sk_lookup_tcp, bpf_sk_lookup_udp and bpf_sk_release helpers from
test_sock_addr programs to make sure they're available and can lookup
and release socket properly for IPv4/IPv4, TCP/UDP.

Reading from a few fields of returned struct bpf_sock is also tested.

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrey Ignatov
2018-11-09 10:54:02 -08:00
committed by Alexei Starovoitov
parent 6c49e65e0d
commit 9108e3a023
2 changed files with 78 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
tools/testing/selftests/bpf/connect4_prog.c
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@@ -21,23 +21,48 @@ int _version SEC("version") = 1;
SEC("cgroup/connect4")
int connect_v4_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock_tuple tuple = {};
struct sockaddr_in sa;
struct bpf_sock *sk;
/* Verify that new destination is available. */
memset(&tuple.ipv4.saddr, 0, sizeof(tuple.ipv4.saddr));
memset(&tuple.ipv4.sport, 0, sizeof(tuple.ipv4.sport));
tuple.ipv4.daddr = bpf_htonl(DST_REWRITE_IP4);
tuple.ipv4.dport = bpf_htons(DST_REWRITE_PORT4);
if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
return 0;
else if (ctx->type == SOCK_STREAM)
sk = bpf_sk_lookup_tcp(ctx, &tuple, sizeof(tuple.ipv4), 0, 0);
else
sk = bpf_sk_lookup_udp(ctx, &tuple, sizeof(tuple.ipv4), 0, 0);
if (!sk)
return 0;
if (sk->src_ip4 != tuple.ipv4.daddr ||
sk->src_port != DST_REWRITE_PORT4) {
bpf_sk_release(sk);
return 0;
}
bpf_sk_release(sk);
/* Rewrite destination. */
ctx->user_ip4 = bpf_htonl(DST_REWRITE_IP4);
ctx->user_port = bpf_htons(DST_REWRITE_PORT4);
if (ctx->type == SOCK_DGRAM || ctx->type == SOCK_STREAM) {
///* Rewrite source. */
memset(&sa, 0, sizeof(sa));
/* Rewrite source. */
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = bpf_htons(0);
sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4);
sa.sin_family = AF_INET;
sa.sin_port = bpf_htons(0);
sa.sin_addr.s_addr = bpf_htonl(SRC_REWRITE_IP4);
if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
return 0;
}
if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
return 0;
return 1;
}