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selftests/bpf: Verify first of struct mptcp_sock

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This patch verifies the 'first' struct member of struct mptcp_sock, which
points to the first subflow of msk. Save 'sk' in mptcp_storage, and verify
it with 'first' in verify_msk().

v5:
 - Use ASSERT_EQ() instead of a manual comparison + log (Andrii).

Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Link: https://lore.kernel.org/bpf/20220519233016.105670-8-mathew.j.martineau@linux.intel.com
This commit is contained in:
Geliang Tang 2022-05-19 16:30:16 -07:00 committed by Andrii Nakryiko
parent ccc090f469
commit 4f90d034bb
3 changed files with 11 additions and 0 deletions
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1
tools/testing/selftests/bpf/bpf_tcp_helpers.h
View File

@ -234,6 +234,7 @@ struct mptcp_sock {
struct inet_connection_sock sk;
__u32 token;
struct sock *first;
char ca_name[TCP_CA_NAME_MAX];
} __attribute__((preserve_access_index));

5
tools/testing/selftests/bpf/prog_tests/mptcp.c
View File

@ -14,7 +14,9 @@
struct mptcp_storage {
__u32 invoked;
__u32 is_mptcp;
struct sock *sk;
__u32 token;
struct sock *first;
char ca_name[TCP_CA_NAME_MAX];
};
@ -80,6 +82,9 @@ static int verify_msk(int map_fd, int client_fd, __u32 token)
if (!ASSERT_EQ(val.token, token, "unexpected token"))
err++;
if (!ASSERT_EQ(val.first, val.sk, "unexpected first"))
err++;
if (!ASSERT_STRNEQ(val.ca_name, ca_name, TCP_CA_NAME_MAX, "unexpected ca_name"))
err++;

5
tools/testing/selftests/bpf/progs/mptcp_sock.c
View File

@ -12,7 +12,9 @@ __u32 token = 0;
struct mptcp_storage {
__u32 invoked;
__u32 is_mptcp;
struct sock *sk;
__u32 token;
struct sock *first;
char ca_name[TCP_CA_NAME_MAX];
};
@ -53,6 +55,7 @@ int _sockops(struct bpf_sock_ops *ctx)
storage->token = 0;
__builtin_memset(storage->ca_name, 0, TCP_CA_NAME_MAX);
storage->first = NULL;
} else {
msk = bpf_skc_to_mptcp_sock(sk);
if (!msk)
@ -65,9 +68,11 @@ int _sockops(struct bpf_sock_ops *ctx)
storage->token = msk->token;
__builtin_memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX);
storage->first = msk->first;
}
storage->invoked++;
storage->is_mptcp = is_mptcp;
storage->sk = (struct sock *)sk;
return 1;
}