bpf: Extend bind v4/v6 selftests for mark/prio/bindtoifindex

Extend existing cgroup bind4/bind6 tests to add coverage for setting and
retrieving SO_MARK, SO_PRIORITY and SO_BINDTOIFINDEX at the bind hook.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/384fdc90e5fa83f8335a37aa90fa2f5f3661929c.1610406333.git.daniel@iogearbox.net

tools/testing/selftests/bpf/progs/bind4_prog.c

@@ -29,18 +29,48 @@ static __inline int bind_to_device(struct bpf_sock_addr *ctx)
 	char veth2[IFNAMSIZ] = "test_sock_addr2";
 	char missing[IFNAMSIZ] = "nonexistent_dev";
 	char del_bind[IFNAMSIZ] = "";
+	int veth1_idx, veth2_idx;
 
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&veth1, sizeof(veth1)))
+			   &veth1, sizeof(veth1)))
+		return 1;
+	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
+			   &veth1_idx, sizeof(veth1_idx)) || !veth1_idx)
 		return 1;
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&veth2, sizeof(veth2)))
+			   &veth2, sizeof(veth2)))
+		return 1;
+	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
+			   &veth2_idx, sizeof(veth2_idx)) || !veth2_idx ||
+	    veth1_idx == veth2_idx)
 		return 1;
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&missing, sizeof(missing)) != -ENODEV)
+			   &missing, sizeof(missing)) != -ENODEV)
+		return 1;
+	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
+			   &veth1_idx, sizeof(veth1_idx)))
 		return 1;
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&del_bind, sizeof(del_bind)))
+			   &del_bind, sizeof(del_bind)))
+		return 1;
+
+	return 0;
+}
+
+static __inline int misc_opts(struct bpf_sock_addr *ctx, int opt)
+{
+	int old, tmp, new = 0xeb9f;
+
+	/* Socket in test case has guarantee that old never equals to new. */
+	if (bpf_getsockopt(ctx, SOL_SOCKET, opt, &old, sizeof(old)) ||
+	    old == new)
+		return 1;
+	if (bpf_setsockopt(ctx, SOL_SOCKET, opt, &new, sizeof(new)))
+		return 1;
+	if (bpf_getsockopt(ctx, SOL_SOCKET, opt, &tmp, sizeof(tmp)) ||
+	    tmp != new)
+		return 1;
+	if (bpf_setsockopt(ctx, SOL_SOCKET, opt, &old, sizeof(old)))
 		return 1;
 
 	return 0;
@@ -93,6 +123,10 @@ int bind_v4_prog(struct bpf_sock_addr *ctx)
 	if (bind_to_device(ctx))
 		return 0;
 
+	/* Test for misc socket options. */
+	if (misc_opts(ctx, SO_MARK) || misc_opts(ctx, SO_PRIORITY))
+		return 0;
+
 	ctx->user_ip4 = bpf_htonl(SERV4_REWRITE_IP);
 	ctx->user_port = bpf_htons(SERV4_REWRITE_PORT);
 

tools/testing/selftests/bpf/progs/bind6_prog.c

@@ -35,18 +35,48 @@ static __inline int bind_to_device(struct bpf_sock_addr *ctx)
 	char veth2[IFNAMSIZ] = "test_sock_addr2";
 	char missing[IFNAMSIZ] = "nonexistent_dev";
 	char del_bind[IFNAMSIZ] = "";
+	int veth1_idx, veth2_idx;
 
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&veth1, sizeof(veth1)))
+			   &veth1, sizeof(veth1)))
+		return 1;
+	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
+			   &veth1_idx, sizeof(veth1_idx)) || !veth1_idx)
 		return 1;
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&veth2, sizeof(veth2)))
+			   &veth2, sizeof(veth2)))
+		return 1;
+	if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
+			   &veth2_idx, sizeof(veth2_idx)) || !veth2_idx ||
+	    veth1_idx == veth2_idx)
 		return 1;
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&missing, sizeof(missing)) != -ENODEV)
+			   &missing, sizeof(missing)) != -ENODEV)
+		return 1;
+	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
+			   &veth1_idx, sizeof(veth1_idx)))
 		return 1;
 	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
-				&del_bind, sizeof(del_bind)))
+			   &del_bind, sizeof(del_bind)))
+		return 1;
+
+	return 0;
+}
+
+static __inline int misc_opts(struct bpf_sock_addr *ctx, int opt)
+{
+	int old, tmp, new = 0xeb9f;
+
+	/* Socket in test case has guarantee that old never equals to new. */
+	if (bpf_getsockopt(ctx, SOL_SOCKET, opt, &old, sizeof(old)) ||
+	    old == new)
+		return 1;
+	if (bpf_setsockopt(ctx, SOL_SOCKET, opt, &new, sizeof(new)))
+		return 1;
+	if (bpf_getsockopt(ctx, SOL_SOCKET, opt, &tmp, sizeof(tmp)) ||
+	    tmp != new)
+		return 1;
+	if (bpf_setsockopt(ctx, SOL_SOCKET, opt, &old, sizeof(old)))
 		return 1;
 
 	return 0;
@@ -107,6 +137,10 @@ int bind_v6_prog(struct bpf_sock_addr *ctx)
 	if (bind_to_device(ctx))
 		return 0;
 
+	/* Test for misc socket options. */
+	if (misc_opts(ctx, SO_MARK) || misc_opts(ctx, SO_PRIORITY))
+		return 0;
+
 	ctx->user_ip6[0] = bpf_htonl(SERV6_REWRITE_IP_0);
 	ctx->user_ip6[1] = bpf_htonl(SERV6_REWRITE_IP_1);
 	ctx->user_ip6[2] = bpf_htonl(SERV6_REWRITE_IP_2);