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selftests/bpf: Test bpf_skc_to_mptcp_sock
This patch extends the MPTCP test base, to test the new helper bpf_skc_to_mptcp_sock(). Define struct mptcp_sock in bpf_tcp_helpers.h, use bpf_skc_to_mptcp_sock to get the msk socket in progs/mptcp_sock.c and store the infos in socket_storage_map. Get the infos from socket_storage_map in prog_tests/mptcp.c. Add a new function verify_msk() to verify the infos of MPTCP socket, and rename verify_sk() to verify_tsk() to verify TCP socket only. v2: Add CONFIG_MPTCP check for clearer error messages v4: - use ASSERT_* instead of CHECK_FAIL (Andrii) - drop bpf_mptcp_helpers.h (Andrii) v5: - some 'ASSERT_*' were replaced in the next commit by mistake. - Drop CONFIG_MPTCP (Martin) - Use ASSERT_EQ (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/20220519233016.105670-5-mathew.j.martineau@linux.intel.com
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parent
8039d35321
commit
3bc48b56e3
3 changed files with 40 additions and 10 deletions
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@ -226,4 +226,8 @@ static __always_inline bool tcp_cc_eq(const char *a, const char *b)
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extern __u32 tcp_slow_start(struct tcp_sock *tp, __u32 acked) __ksym;
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extern void tcp_cong_avoid_ai(struct tcp_sock *tp, __u32 w, __u32 acked) __ksym;
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struct mptcp_sock {
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struct inet_connection_sock sk;
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} __attribute__((preserve_access_index));
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#endif
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@ -12,14 +12,11 @@ struct mptcp_storage {
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__u32 is_mptcp;
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};
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static int verify_sk(int map_fd, int client_fd, __u32 is_mptcp)
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static int verify_tsk(int map_fd, int client_fd)
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{
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int err, cfd = client_fd;
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struct mptcp_storage val;
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if (is_mptcp == 1)
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return 0;
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err = bpf_map_lookup_elem(map_fd, &cfd, &val);
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if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
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return err;
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@ -33,6 +30,24 @@ static int verify_sk(int map_fd, int client_fd, __u32 is_mptcp)
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return err;
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}
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static int verify_msk(int map_fd, int client_fd)
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{
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int err, cfd = client_fd;
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struct mptcp_storage val;
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err = bpf_map_lookup_elem(map_fd, &cfd, &val);
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if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
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return err;
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if (!ASSERT_EQ(val.invoked, 1, "unexpected invoked count"))
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err++;
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if (!ASSERT_EQ(val.is_mptcp, 1, "unexpected is_mptcp"))
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err++;
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return err;
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}
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static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
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{
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int client_fd, prog_fd, map_fd, err;
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@ -64,8 +79,8 @@ static int run_test(int cgroup_fd, int server_fd, bool is_mptcp)
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goto out;
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}
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err += is_mptcp ? verify_sk(map_fd, client_fd, 1) :
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verify_sk(map_fd, client_fd, 0);
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err += is_mptcp ? verify_msk(map_fd, client_fd) :
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verify_tsk(map_fd, client_fd);
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close(client_fd);
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@ -24,6 +24,7 @@ SEC("sockops")
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int _sockops(struct bpf_sock_ops *ctx)
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{
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struct mptcp_storage *storage;
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struct mptcp_sock *msk;
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int op = (int)ctx->op;
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struct tcp_sock *tsk;
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struct bpf_sock *sk;
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@ -41,11 +42,21 @@ int _sockops(struct bpf_sock_ops *ctx)
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return 1;
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is_mptcp = bpf_core_field_exists(tsk->is_mptcp) ? tsk->is_mptcp : 0;
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storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!storage)
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return 1;
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if (!is_mptcp) {
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storage = bpf_sk_storage_get(&socket_storage_map, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!storage)
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return 1;
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} else {
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msk = bpf_skc_to_mptcp_sock(sk);
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if (!msk)
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return 1;
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storage = bpf_sk_storage_get(&socket_storage_map, msk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!storage)
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return 1;
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}
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storage->invoked++;
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storage->is_mptcp = is_mptcp;
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