selftests/bpf: Verify ca_name of struct mptcp_sock

This patch verifies another member of struct mptcp_sock, ca_name. Add a
new function get_msk_ca_name() to read the sysctl tcp_congestion_control
and verify it in verify_msk().

v3: Access the sysctl through the filesystem to avoid compatibility
    issues with the busybox sysctl command.

v4: use ASSERT_* instead of CHECK_FAIL (Andrii)

v5: use ASSERT_STRNEQ() instead of strncmp() (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/20220519233016.105670-7-mathew.j.martineau@linux.intel.com

diff --git a/tools/testing/selftests/bpf/bpf_tcp_helpers.h b/tools/testing/selftests/bpf/bpf_tcp_helpers.h
index 4224918..c38c66d 100644 (file)
--- a/tools/testing/selftests/bpf/bpf_tcp_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_tcp_helpers.h
@@ -16,6 +16,10 @@ BPF_PROG(name, args)
 #define SOL_TCP 6
 #endif
 
+#ifndef TCP_CA_NAME_MAX
+#define TCP_CA_NAME_MAX        16
+#endif
+
 #define tcp_jiffies32 ((__u32)bpf_jiffies64())
 
 struct sock_common {
@@ -230,6 +234,7 @@ struct mptcp_sock {
        struct inet_connection_sock     sk;
 
        __u32           token;
+       char            ca_name[TCP_CA_NAME_MAX];
 } __attribute__((preserve_access_index));
 
 #endif

diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
index c84d7c5..33cafc6 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
+++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
@@ -7,10 +7,15 @@
 #include "network_helpers.h"
 #include "mptcp_sock.skel.h"
 
+#ifndef TCP_CA_NAME_MAX
+#define TCP_CA_NAME_MAX        16
+#endif
+
 struct mptcp_storage {
        __u32 invoked;
        __u32 is_mptcp;
        __u32 token;
+       char ca_name[TCP_CA_NAME_MAX];
 };
 
 static int verify_tsk(int map_fd, int client_fd)
@@ -31,14 +36,37 @@ static int verify_tsk(int map_fd, int client_fd)
        return err;
 }
 
+static void get_msk_ca_name(char ca_name[])
+{
+       size_t len;
+       int fd;
+
+       fd = open("/proc/sys/net/ipv4/tcp_congestion_control", O_RDONLY);
+       if (!ASSERT_GE(fd, 0, "failed to open tcp_congestion_control"))
+               return;
+
+       len = read(fd, ca_name, TCP_CA_NAME_MAX);
+       if (!ASSERT_GT(len, 0, "failed to read ca_name"))
+               goto err;
+
+       if (len > 0 && ca_name[len - 1] == '\n')
+               ca_name[len - 1] = '\0';
+
+err:
+       close(fd);
+}
+
 static int verify_msk(int map_fd, int client_fd, __u32 token)
 {
+       char ca_name[TCP_CA_NAME_MAX];
        int err, cfd = client_fd;
        struct mptcp_storage val;
 
        if (!ASSERT_GT(token, 0, "invalid token"))
                return -1;
 
+       get_msk_ca_name(ca_name);
+
        err = bpf_map_lookup_elem(map_fd, &cfd, &val);
        if (!ASSERT_OK(err, "bpf_map_lookup_elem"))
                return err;
@@ -52,6 +80,9 @@ static int verify_msk(int map_fd, int client_fd, __u32 token)
        if (!ASSERT_EQ(val.token, token, "unexpected token"))
                err++;
 
+       if (!ASSERT_STRNEQ(val.ca_name, ca_name, TCP_CA_NAME_MAX, "unexpected ca_name"))
+               err++;
+
        return err;
 }
 

diff --git a/tools/testing/selftests/bpf/progs/mptcp_sock.c b/tools/testing/selftests/bpf/progs/mptcp_sock.c
index f038b0e..65e2b55 100644 (file)
--- a/tools/testing/selftests/bpf/progs/mptcp_sock.c
+++ b/tools/testing/selftests/bpf/progs/mptcp_sock.c
@@ -13,6 +13,7 @@ struct mptcp_storage {
        __u32 invoked;
        __u32 is_mptcp;
        __u32 token;
+       char ca_name[TCP_CA_NAME_MAX];
 };
 
 struct {
@@ -51,6 +52,7 @@ int _sockops(struct bpf_sock_ops *ctx)
                        return 1;
 
                storage->token = 0;
+               __builtin_memset(storage->ca_name, 0, TCP_CA_NAME_MAX);
        } else {
                msk = bpf_skc_to_mptcp_sock(sk);
                if (!msk)
@@ -62,6 +64,7 @@ int _sockops(struct bpf_sock_ops *ctx)
                        return 1;
 
                storage->token = msk->token;
+               __builtin_memcpy(storage->ca_name, msk->ca_name, TCP_CA_NAME_MAX);
        }
        storage->invoked++;
        storage->is_mptcp = is_mptcp;