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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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selftests: bpf: Convert sk_lookup ctx access tests to PROG_TEST_RUN
Convert the selftests for sk_lookup narrow context access to use PROG_TEST_RUN instead of creating actual sockets. This ensures that ctx is populated correctly when using PROG_TEST_RUN. Assert concrete values since we now control remote_ip and remote_port. Signed-off-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210303101816.36774-4-lmb@cloudflare.com
This commit is contained in:
Lorenz Bauer
Alexei Starovoitov
parent
7c32e8f8bc
commit
509b2937bc
2 changed files with 109 additions and 36 deletions
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@ -241,6 +241,48 @@ static int make_client(int sotype, const char *ip, int port)
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return -1;
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}
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static __u64 socket_cookie(int fd)
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{
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__u64 cookie;
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socklen_t cookie_len = sizeof(cookie);
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if (CHECK(getsockopt(fd, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len) < 0,
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"getsockopt(SO_COOKIE)", "%s\n", strerror(errno)))
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return 0;
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return cookie;
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}
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static int fill_sk_lookup_ctx(struct bpf_sk_lookup *ctx, const char *local_ip, __u16 local_port,
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const char *remote_ip, __u16 remote_port)
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{
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void *local, *remote;
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int err;
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memset(ctx, 0, sizeof(*ctx));
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ctx->local_port = local_port;
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ctx->remote_port = htons(remote_port);
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if (is_ipv6(local_ip)) {
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ctx->family = AF_INET6;
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local = &ctx->local_ip6[0];
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remote = &ctx->remote_ip6[0];
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} else {
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ctx->family = AF_INET;
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local = &ctx->local_ip4;
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remote = &ctx->remote_ip4;
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}
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err = inet_pton(ctx->family, local_ip, local);
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if (CHECK(err != 1, "inet_pton", "local_ip failed\n"))
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return 1;
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err = inet_pton(ctx->family, remote_ip, remote);
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if (CHECK(err != 1, "inet_pton", "remote_ip failed\n"))
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return 1;
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return 0;
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}
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static int send_byte(int fd)
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{
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ssize_t n;
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@ -1009,18 +1051,27 @@ static void test_drop_on_reuseport(struct test_sk_lookup *skel)
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static void run_sk_assign(struct test_sk_lookup *skel,
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struct bpf_program *lookup_prog,
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const char *listen_ip, const char *connect_ip)
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const char *remote_ip, const char *local_ip)
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{
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int client_fd, peer_fd, server_fds[MAX_SERVERS] = { -1 };
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struct bpf_link *lookup_link;
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int server_fds[MAX_SERVERS] = { -1 };
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struct bpf_sk_lookup ctx;
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__u64 server_cookie;
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int i, err;
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lookup_link = attach_lookup_prog(lookup_prog);
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if (!lookup_link)
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DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
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.ctx_in = &ctx,
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.ctx_size_in = sizeof(ctx),
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.ctx_out = &ctx,
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.ctx_size_out = sizeof(ctx),
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);
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if (fill_sk_lookup_ctx(&ctx, local_ip, EXT_PORT, remote_ip, INT_PORT))
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return;
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ctx.protocol = IPPROTO_TCP;
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for (i = 0; i < ARRAY_SIZE(server_fds); i++) {
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server_fds[i] = make_server(SOCK_STREAM, listen_ip, 0, NULL);
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server_fds[i] = make_server(SOCK_STREAM, local_ip, 0, NULL);
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if (server_fds[i] < 0)
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goto close_servers;
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@ -1030,23 +1081,25 @@ static void run_sk_assign(struct test_sk_lookup *skel,
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goto close_servers;
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}
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client_fd = make_client(SOCK_STREAM, connect_ip, EXT_PORT);
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if (client_fd < 0)
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server_cookie = socket_cookie(server_fds[SERVER_B]);
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if (!server_cookie)
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return;
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err = bpf_prog_test_run_opts(bpf_program__fd(lookup_prog), &opts);
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if (CHECK(err, "test_run", "failed with error %d\n", errno))
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goto close_servers;
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peer_fd = accept(server_fds[SERVER_B], NULL, NULL);
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if (CHECK(peer_fd < 0, "accept", "failed\n"))
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goto close_client;
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if (CHECK(ctx.cookie == 0, "ctx.cookie", "no socket selected\n"))
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goto close_servers;
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CHECK(ctx.cookie != server_cookie, "ctx.cookie",
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"selected sk %llu instead of %llu\n", ctx.cookie, server_cookie);
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close(peer_fd);
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close_client:
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close(client_fd);
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close_servers:
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for (i = 0; i < ARRAY_SIZE(server_fds); i++) {
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if (server_fds[i] != -1)
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close(server_fds[i]);
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}
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bpf_link__destroy(lookup_link);
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}
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static void run_sk_assign_v4(struct test_sk_lookup *skel,
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@ -64,6 +64,10 @@ static const int PROG_DONE = 1;
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static const __u32 KEY_SERVER_A = SERVER_A;
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static const __u32 KEY_SERVER_B = SERVER_B;
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static const __u16 SRC_PORT = bpf_htons(8008);
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static const __u32 SRC_IP4 = IP4(127, 0, 0, 2);
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static const __u32 SRC_IP6[] = IP6(0xfd000000, 0x0, 0x0, 0x00000002);
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static const __u16 DST_PORT = 7007; /* Host byte order */
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static const __u32 DST_IP4 = IP4(127, 0, 0, 1);
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static const __u32 DST_IP6[] = IP6(0xfd000000, 0x0, 0x0, 0x00000001);
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@ -398,11 +402,12 @@ int ctx_narrow_access(struct bpf_sk_lookup *ctx)
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if (LSW(ctx->protocol, 0) != IPPROTO_TCP)
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return SK_DROP;
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/* Narrow loads from remote_port field. Expect non-0 value. */
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if (LSB(ctx->remote_port, 0) == 0 && LSB(ctx->remote_port, 1) == 0 &&
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LSB(ctx->remote_port, 2) == 0 && LSB(ctx->remote_port, 3) == 0)
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/* Narrow loads from remote_port field. Expect SRC_PORT. */
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if (LSB(ctx->remote_port, 0) != ((SRC_PORT >> 0) & 0xff) ||
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LSB(ctx->remote_port, 1) != ((SRC_PORT >> 8) & 0xff) ||
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LSB(ctx->remote_port, 2) != 0 || LSB(ctx->remote_port, 3) != 0)
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return SK_DROP;
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if (LSW(ctx->remote_port, 0) == 0)
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if (LSW(ctx->remote_port, 0) != SRC_PORT)
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return SK_DROP;
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/* Narrow loads from local_port field. Expect DST_PORT. */
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@ -415,11 +420,14 @@ int ctx_narrow_access(struct bpf_sk_lookup *ctx)
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/* Narrow loads from IPv4 fields */
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if (v4) {
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/* Expect non-0.0.0.0 in remote_ip4 */
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if (LSB(ctx->remote_ip4, 0) == 0 && LSB(ctx->remote_ip4, 1) == 0 &&
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LSB(ctx->remote_ip4, 2) == 0 && LSB(ctx->remote_ip4, 3) == 0)
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/* Expect SRC_IP4 in remote_ip4 */
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if (LSB(ctx->remote_ip4, 0) != ((SRC_IP4 >> 0) & 0xff) ||
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LSB(ctx->remote_ip4, 1) != ((SRC_IP4 >> 8) & 0xff) ||
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LSB(ctx->remote_ip4, 2) != ((SRC_IP4 >> 16) & 0xff) ||
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LSB(ctx->remote_ip4, 3) != ((SRC_IP4 >> 24) & 0xff))
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return SK_DROP;
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if (LSW(ctx->remote_ip4, 0) == 0 && LSW(ctx->remote_ip4, 1) == 0)
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if (LSW(ctx->remote_ip4, 0) != ((SRC_IP4 >> 0) & 0xffff) ||
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LSW(ctx->remote_ip4, 1) != ((SRC_IP4 >> 16) & 0xffff))
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return SK_DROP;
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/* Expect DST_IP4 in local_ip4 */
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@ -448,20 +456,32 @@ int ctx_narrow_access(struct bpf_sk_lookup *ctx)
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/* Narrow loads from IPv6 fields */
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if (!v4) {
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/* Expect non-:: IP in remote_ip6 */
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if (LSB(ctx->remote_ip6[0], 0) == 0 && LSB(ctx->remote_ip6[0], 1) == 0 &&
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LSB(ctx->remote_ip6[0], 2) == 0 && LSB(ctx->remote_ip6[0], 3) == 0 &&
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LSB(ctx->remote_ip6[1], 0) == 0 && LSB(ctx->remote_ip6[1], 1) == 0 &&
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LSB(ctx->remote_ip6[1], 2) == 0 && LSB(ctx->remote_ip6[1], 3) == 0 &&
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LSB(ctx->remote_ip6[2], 0) == 0 && LSB(ctx->remote_ip6[2], 1) == 0 &&
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LSB(ctx->remote_ip6[2], 2) == 0 && LSB(ctx->remote_ip6[2], 3) == 0 &&
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LSB(ctx->remote_ip6[3], 0) == 0 && LSB(ctx->remote_ip6[3], 1) == 0 &&
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LSB(ctx->remote_ip6[3], 2) == 0 && LSB(ctx->remote_ip6[3], 3) == 0)
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/* Expect SRC_IP6 in remote_ip6 */
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if (LSB(ctx->remote_ip6[0], 0) != ((SRC_IP6[0] >> 0) & 0xff) ||
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LSB(ctx->remote_ip6[0], 1) != ((SRC_IP6[0] >> 8) & 0xff) ||
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LSB(ctx->remote_ip6[0], 2) != ((SRC_IP6[0] >> 16) & 0xff) ||
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LSB(ctx->remote_ip6[0], 3) != ((SRC_IP6[0] >> 24) & 0xff) ||
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LSB(ctx->remote_ip6[1], 0) != ((SRC_IP6[1] >> 0) & 0xff) ||
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LSB(ctx->remote_ip6[1], 1) != ((SRC_IP6[1] >> 8) & 0xff) ||
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LSB(ctx->remote_ip6[1], 2) != ((SRC_IP6[1] >> 16) & 0xff) ||
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LSB(ctx->remote_ip6[1], 3) != ((SRC_IP6[1] >> 24) & 0xff) ||
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LSB(ctx->remote_ip6[2], 0) != ((SRC_IP6[2] >> 0) & 0xff) ||
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LSB(ctx->remote_ip6[2], 1) != ((SRC_IP6[2] >> 8) & 0xff) ||
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LSB(ctx->remote_ip6[2], 2) != ((SRC_IP6[2] >> 16) & 0xff) ||
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LSB(ctx->remote_ip6[2], 3) != ((SRC_IP6[2] >> 24) & 0xff) ||
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LSB(ctx->remote_ip6[3], 0) != ((SRC_IP6[3] >> 0) & 0xff) ||
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LSB(ctx->remote_ip6[3], 1) != ((SRC_IP6[3] >> 8) & 0xff) ||
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LSB(ctx->remote_ip6[3], 2) != ((SRC_IP6[3] >> 16) & 0xff) ||
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LSB(ctx->remote_ip6[3], 3) != ((SRC_IP6[3] >> 24) & 0xff))
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return SK_DROP;
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if (LSW(ctx->remote_ip6[0], 0) == 0 && LSW(ctx->remote_ip6[0], 1) == 0 &&
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LSW(ctx->remote_ip6[1], 0) == 0 && LSW(ctx->remote_ip6[1], 1) == 0 &&
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LSW(ctx->remote_ip6[2], 0) == 0 && LSW(ctx->remote_ip6[2], 1) == 0 &&
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LSW(ctx->remote_ip6[3], 0) == 0 && LSW(ctx->remote_ip6[3], 1) == 0)
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if (LSW(ctx->remote_ip6[0], 0) != ((SRC_IP6[0] >> 0) & 0xffff) ||
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LSW(ctx->remote_ip6[0], 1) != ((SRC_IP6[0] >> 16) & 0xffff) ||
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LSW(ctx->remote_ip6[1], 0) != ((SRC_IP6[1] >> 0) & 0xffff) ||
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LSW(ctx->remote_ip6[1], 1) != ((SRC_IP6[1] >> 16) & 0xffff) ||
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LSW(ctx->remote_ip6[2], 0) != ((SRC_IP6[2] >> 0) & 0xffff) ||
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LSW(ctx->remote_ip6[2], 1) != ((SRC_IP6[2] >> 16) & 0xffff) ||
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LSW(ctx->remote_ip6[3], 0) != ((SRC_IP6[3] >> 0) & 0xffff) ||
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LSW(ctx->remote_ip6[3], 1) != ((SRC_IP6[3] >> 16) & 0xffff))
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return SK_DROP;
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/* Expect DST_IP6 in local_ip6 */
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if (LSB(ctx->local_ip6[0], 0) != ((DST_IP6[0] >> 0) & 0xff) ||
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