diff mbox series

[v1,bpf-next,15/17] sefltests/bpf: Expand sockaddr hook deny tests

Message ID 20240510190246.3247730-16-jrife@google.com (mailing list archive)
State Accepted
Commit dfb7539b47b501ccc0d23bae718500ada2157aee
Delegated to: BPF
Headers show
Series Retire progs/test_sock_addr.c | expand

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Commit Message

Jordan Rife May 10, 2024, 7:02 p.m. UTC 
This patch expands test coverage for EPERM tests to include connect and
bind calls and rounds out the coverage for sendmsg by adding tests for
sendmsg_unix.

Signed-off-by: Jordan Rife <jrife@google.com>
---
 .../selftests/bpf/prog_tests/sock_addr.c      | 342 ++++++++++++++++++
 .../testing/selftests/bpf/progs/bind4_prog.c  |   6 +
 .../testing/selftests/bpf/progs/bind6_prog.c  |   6 +
 .../selftests/bpf/progs/connect4_prog.c       |   6 +
 .../selftests/bpf/progs/connect6_prog.c       |   6 +
 .../selftests/bpf/progs/connect_unix_prog.c   |   6 +
 .../selftests/bpf/progs/sendmsg_unix_prog.c   |   6 +
 7 files changed, 378 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/sock_addr.c b/tools/testing/selftests/bpf/prog_tests/sock_addr.c
index ebd5e58e38c5c..0477b4080b2e8 100644
--- a/tools/testing/selftests/bpf/prog_tests/sock_addr.c
+++ b/tools/testing/selftests/bpf/prog_tests/sock_addr.c
@@ -439,13 +439,18 @@  static void prog_name##_destroy(void *skel) \
 
 BPF_SKEL_FUNCS(bind4_prog, bind_v4_prog);
 BPF_SKEL_FUNCS_RAW(bind4_prog, bind_v4_prog);
+BPF_SKEL_FUNCS(bind4_prog, bind_v4_deny_prog);
 BPF_SKEL_FUNCS(bind6_prog, bind_v6_prog);
 BPF_SKEL_FUNCS_RAW(bind6_prog, bind_v6_prog);
+BPF_SKEL_FUNCS(bind6_prog, bind_v6_deny_prog);
 BPF_SKEL_FUNCS(connect4_prog, connect_v4_prog);
 BPF_SKEL_FUNCS_RAW(connect4_prog, connect_v4_prog);
+BPF_SKEL_FUNCS(connect4_prog, connect_v4_deny_prog);
 BPF_SKEL_FUNCS(connect6_prog, connect_v6_prog);
 BPF_SKEL_FUNCS_RAW(connect6_prog, connect_v6_prog);
+BPF_SKEL_FUNCS(connect6_prog, connect_v6_deny_prog);
 BPF_SKEL_FUNCS(connect_unix_prog, connect_unix_prog);
+BPF_SKEL_FUNCS(connect_unix_prog, connect_unix_deny_prog);
 BPF_SKEL_FUNCS(sendmsg4_prog, sendmsg_v4_prog);
 BPF_SKEL_FUNCS_RAW(sendmsg4_prog, sendmsg_v4_prog);
 BPF_SKEL_FUNCS(sendmsg4_prog, sendmsg_v4_deny_prog);
@@ -456,6 +461,7 @@  BPF_SKEL_FUNCS(sendmsg6_prog, sendmsg_v6_preserve_dst_prog);
 BPF_SKEL_FUNCS(sendmsg6_prog, sendmsg_v6_v4mapped_prog);
 BPF_SKEL_FUNCS(sendmsg6_prog, sendmsg_v6_wildcard_prog);
 BPF_SKEL_FUNCS(sendmsg_unix_prog, sendmsg_unix_prog);
+BPF_SKEL_FUNCS(sendmsg_unix_prog, sendmsg_unix_deny_prog);
 BPF_SKEL_FUNCS(recvmsg4_prog, recvmsg4_prog);
 BPF_SKEL_FUNCS(recvmsg6_prog, recvmsg6_prog);
 BPF_SKEL_FUNCS(recvmsg_unix_prog, recvmsg_unix_prog);
@@ -480,6 +486,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind4: bind deny (stream)",
+		bind_v4_deny_prog_load,
+		bind_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_BIND,
+		&user_ops,
+		AF_INET,
+		SOCK_STREAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind4: bind (dgram)",
@@ -496,6 +518,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind4: bind deny (dgram)",
+		bind_v4_deny_prog_load,
+		bind_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_BIND,
+		&user_ops,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind4: load prog with wrong expected attach type",
@@ -544,6 +582,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind6: bind deny (stream)",
+		bind_v6_deny_prog_load,
+		bind_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_BIND,
+		&user_ops,
+		AF_INET6,
+		SOCK_STREAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind6: bind (dgram)",
@@ -560,6 +614,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind6: bind deny (dgram)",
+		bind_v6_deny_prog_load,
+		bind_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_BIND,
+		&user_ops,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind6: load prog with wrong expected attach type",
@@ -610,6 +680,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind4: kernel_bind deny (stream)",
+		bind_v4_deny_prog_load,
+		bind_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_BIND,
+		&kern_ops_sock_sendmsg,
+		AF_INET,
+		SOCK_STREAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind4: kernel_bind (dgram)",
@@ -626,6 +712,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind4: kernel_bind deny (dgram)",
+		bind_v4_deny_prog_load,
+		bind_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_BIND,
+		&kern_ops_sock_sendmsg,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind6: kernel_bind (stream)",
@@ -642,6 +744,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind6: kernel_bind deny (stream)",
+		bind_v6_deny_prog_load,
+		bind_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_BIND,
+		&kern_ops_sock_sendmsg,
+		AF_INET6,
+		SOCK_STREAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_BIND,
 		"bind6: kernel_bind (dgram)",
@@ -658,6 +776,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_BIND,
+		"bind6: kernel_bind deny (dgram)",
+		bind_v6_deny_prog_load,
+		bind_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_BIND,
+		&kern_ops_sock_sendmsg,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		NULL,
+		SYSCALL_EPERM,
+	},
 
 	/* connect - system calls */
 	{
@@ -676,6 +810,22 @@  static struct sock_addr_test tests[] = {
 		SRC4_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect4: connect deny (stream)",
+		connect_v4_deny_prog_load,
+		connect_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_CONNECT,
+		&user_ops,
+		AF_INET,
+		SOCK_STREAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect4: connect (dgram)",
@@ -692,6 +842,22 @@  static struct sock_addr_test tests[] = {
 		SRC4_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect4: connect deny (dgram)",
+		connect_v4_deny_prog_load,
+		connect_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_CONNECT,
+		&user_ops,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect4: load prog with wrong expected attach type",
@@ -740,6 +906,22 @@  static struct sock_addr_test tests[] = {
 		SRC6_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect6: connect deny (stream)",
+		connect_v6_deny_prog_load,
+		connect_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_CONNECT,
+		&user_ops,
+		AF_INET6,
+		SOCK_STREAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect6: connect (dgram)",
@@ -756,6 +938,22 @@  static struct sock_addr_test tests[] = {
 		SRC6_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect6: connect deny (dgram)",
+		connect_v6_deny_prog_load,
+		connect_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_CONNECT,
+		&user_ops,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect6: load prog with wrong expected attach type",
@@ -804,6 +1002,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect_unix: connect deny (stream)",
+		connect_unix_deny_prog_load,
+		connect_unix_deny_prog_destroy,
+		BPF_CGROUP_UNIX_CONNECT,
+		&user_ops,
+		AF_UNIX,
+		SOCK_STREAM,
+		SERVUN_ADDRESS,
+		0,
+		SERVUN_REWRITE_ADDRESS,
+		0,
+		NULL,
+		SYSCALL_EPERM,
+	},
 
 	/* connect - kernel calls */
 	{
@@ -822,6 +1036,22 @@  static struct sock_addr_test tests[] = {
 		SRC4_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect4: kernel_connect deny (stream)",
+		connect_v4_deny_prog_load,
+		connect_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_CONNECT,
+		&kern_ops_sock_sendmsg,
+		AF_INET,
+		SOCK_STREAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect4: kernel_connect (dgram)",
@@ -838,6 +1068,22 @@  static struct sock_addr_test tests[] = {
 		SRC4_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect4: kernel_connect deny (dgram)",
+		connect_v4_deny_prog_load,
+		connect_v4_deny_prog_destroy,
+		BPF_CGROUP_INET4_CONNECT,
+		&kern_ops_sock_sendmsg,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect6: kernel_connect (stream)",
@@ -854,6 +1100,22 @@  static struct sock_addr_test tests[] = {
 		SRC6_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect6: kernel_connect deny (stream)",
+		connect_v6_deny_prog_load,
+		connect_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_CONNECT,
+		&kern_ops_sock_sendmsg,
+		AF_INET6,
+		SOCK_STREAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect6: kernel_connect (dgram)",
@@ -870,6 +1132,22 @@  static struct sock_addr_test tests[] = {
 		SRC6_REWRITE_IP,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect6: kernel_connect deny (dgram)",
+		connect_v6_deny_prog_load,
+		connect_v6_deny_prog_destroy,
+		BPF_CGROUP_INET6_CONNECT,
+		&kern_ops_sock_sendmsg,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
 	{
 		SOCK_ADDR_TEST_CONNECT,
 		"connect_unix: kernel_connect (dgram)",
@@ -886,6 +1164,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_CONNECT,
+		"connect_unix: kernel_connect deny (dgram)",
+		connect_unix_deny_prog_load,
+		connect_unix_deny_prog_destroy,
+		BPF_CGROUP_UNIX_CONNECT,
+		&kern_ops_sock_sendmsg,
+		AF_UNIX,
+		SOCK_STREAM,
+		SERVUN_ADDRESS,
+		0,
+		SERVUN_REWRITE_ADDRESS,
+		0,
+		NULL,
+		SYSCALL_EPERM,
+	},
 
 	/* sendmsg - system calls */
 	{
@@ -1080,6 +1374,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_SENDMSG,
+		"sendmsg_unix: sendmsg deny (dgram)",
+		sendmsg_unix_deny_prog_load,
+		sendmsg_unix_deny_prog_destroy,
+		BPF_CGROUP_UNIX_SENDMSG,
+		&user_ops,
+		AF_UNIX,
+		SOCK_DGRAM,
+		SERVUN_ADDRESS,
+		0,
+		SERVUN_REWRITE_ADDRESS,
+		0,
+		NULL,
+		SYSCALL_EPERM,
+	},
 
 	/* sendmsg - kernel calls (sock_sendmsg) */
 	{
@@ -1178,6 +1488,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_SENDMSG,
+		"sendmsg_unix: sock_sendmsg deny (dgram)",
+		sendmsg_unix_deny_prog_load,
+		sendmsg_unix_deny_prog_destroy,
+		BPF_CGROUP_UNIX_SENDMSG,
+		&kern_ops_sock_sendmsg,
+		AF_UNIX,
+		SOCK_DGRAM,
+		SERVUN_ADDRESS,
+		0,
+		SERVUN_REWRITE_ADDRESS,
+		0,
+		NULL,
+		SYSCALL_EPERM,
+	},
 
 	/* sendmsg - kernel calls (kernel_sendmsg) */
 	{
@@ -1276,6 +1602,22 @@  static struct sock_addr_test tests[] = {
 		NULL,
 		SUCCESS,
 	},
+	{
+		SOCK_ADDR_TEST_SENDMSG,
+		"sendmsg_unix: kernel_sendmsg deny (dgram)",
+		sendmsg_unix_deny_prog_load,
+		sendmsg_unix_deny_prog_destroy,
+		BPF_CGROUP_UNIX_SENDMSG,
+		&kern_ops_kernel_sendmsg,
+		AF_UNIX,
+		SOCK_DGRAM,
+		SERVUN_ADDRESS,
+		0,
+		SERVUN_REWRITE_ADDRESS,
+		0,
+		NULL,
+		SYSCALL_EPERM,
+	},
 
 	/* recvmsg - system calls */
 	{
diff --git a/tools/testing/selftests/bpf/progs/bind4_prog.c b/tools/testing/selftests/bpf/progs/bind4_prog.c
index 66005c1a5b367..b7ddf8ec4ee89 100644
--- a/tools/testing/selftests/bpf/progs/bind4_prog.c
+++ b/tools/testing/selftests/bpf/progs/bind4_prog.c
@@ -158,4 +158,10 @@  int bind_v4_prog(struct bpf_sock_addr *ctx)
 	return 1;
 }
 
+SEC("cgroup/bind4")
+int bind_v4_deny_prog(struct bpf_sock_addr *ctx)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/bind6_prog.c b/tools/testing/selftests/bpf/progs/bind6_prog.c
index 9c86c712348cf..501c3fc11d356 100644
--- a/tools/testing/selftests/bpf/progs/bind6_prog.c
+++ b/tools/testing/selftests/bpf/progs/bind6_prog.c
@@ -175,4 +175,10 @@  int bind_v6_prog(struct bpf_sock_addr *ctx)
 	return 1;
 }
 
+SEC("cgroup/bind6")
+int bind_v6_deny_prog(struct bpf_sock_addr *ctx)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/connect4_prog.c b/tools/testing/selftests/bpf/progs/connect4_prog.c
index bec529da7c9d2..9e9ebf27b8784 100644
--- a/tools/testing/selftests/bpf/progs/connect4_prog.c
+++ b/tools/testing/selftests/bpf/progs/connect4_prog.c
@@ -199,4 +199,10 @@  int connect_v4_prog(struct bpf_sock_addr *ctx)
 	return do_bind(ctx) ? 1 : 0;
 }
 
+SEC("cgroup/connect4")
+int connect_v4_deny_prog(struct bpf_sock_addr *ctx)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/connect6_prog.c b/tools/testing/selftests/bpf/progs/connect6_prog.c
index 40266d2c737c2..e98573b00ddb2 100644
--- a/tools/testing/selftests/bpf/progs/connect6_prog.c
+++ b/tools/testing/selftests/bpf/progs/connect6_prog.c
@@ -90,4 +90,10 @@  int connect_v6_prog(struct bpf_sock_addr *ctx)
 	return 1;
 }
 
+SEC("cgroup/connect6")
+int connect_v6_deny_prog(struct bpf_sock_addr *ctx)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/connect_unix_prog.c b/tools/testing/selftests/bpf/progs/connect_unix_prog.c
index 2ef0e0c46d17b..ba60adadb3355 100644
--- a/tools/testing/selftests/bpf/progs/connect_unix_prog.c
+++ b/tools/testing/selftests/bpf/progs/connect_unix_prog.c
@@ -36,4 +36,10 @@  int connect_unix_prog(struct bpf_sock_addr *ctx)
 	return 1;
 }
 
+SEC("cgroup/connect_unix")
+int connect_unix_deny_prog(struct bpf_sock_addr *ctx)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/sendmsg_unix_prog.c b/tools/testing/selftests/bpf/progs/sendmsg_unix_prog.c
index d8869b03dda9b..332d0eb1116f8 100644
--- a/tools/testing/selftests/bpf/progs/sendmsg_unix_prog.c
+++ b/tools/testing/selftests/bpf/progs/sendmsg_unix_prog.c
@@ -36,4 +36,10 @@  int sendmsg_unix_prog(struct bpf_sock_addr *ctx)
 	return 1;
 }
 
+SEC("cgroup/sendmsg_unix")
+int sendmsg_unix_deny_prog(struct bpf_sock_addr *ctx)
+{
+	return 0;
+}
+
 char _license[] SEC("license") = "GPL";