Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1655 insertions, 0 deletions

diff --git a/tools/testing/selftests/bpf/test_sock_addr.c b/tools/testing/selftests/bpf/test_sock_addr.c
new file mode 100644
index 000000000..b8c72c1d9
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_sock_addr.c
@@ -0,0 +1,1655 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 Facebook
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#include <sys/socket.h>
+
+#include <linux/filter.h>
+
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#include "cgroup_helpers.h"
+#include "bpf_rlimit.h"
+#include "bpf_util.h"
+
+#ifndef ENOTSUPP
+# define ENOTSUPP 524
+#endif
+
+#define CG_PATH	"/foo"
+#define CONNECT4_PROG_PATH	"./connect4_prog.o"
+#define CONNECT6_PROG_PATH	"./connect6_prog.o"
+#define SENDMSG4_PROG_PATH	"./sendmsg4_prog.o"
+#define SENDMSG6_PROG_PATH	"./sendmsg6_prog.o"
+
+#define SERV4_IP		"192.168.1.254"
+#define SERV4_REWRITE_IP	"127.0.0.1"
+#define SRC4_IP			"172.16.0.1"
+#define SRC4_REWRITE_IP		"127.0.0.4"
+#define SERV4_PORT		4040
+#define SERV4_REWRITE_PORT	4444
+
+#define SERV6_IP		"face:b00c:1234:5678::abcd"
+#define SERV6_REWRITE_IP	"::1"
+#define SERV6_V4MAPPED_IP	"::ffff:192.168.0.4"
+#define SRC6_IP			"::1"
+#define SRC6_REWRITE_IP		"::6"
+#define WILDCARD6_IP		"::"
+#define SERV6_PORT		6060
+#define SERV6_REWRITE_PORT	6666
+
+#define INET_NTOP_BUF	40
+
+struct sock_addr_test;
+
+typedef int (*load_fn)(const struct sock_addr_test *test);
+typedef int (*info_fn)(int, struct sockaddr *, socklen_t *);
+
+char bpf_log_buf[BPF_LOG_BUF_SIZE];
+
+struct sock_addr_test {
+	const char *descr;
+	/* BPF prog properties */
+	load_fn loadfn;
+	enum bpf_attach_type expected_attach_type;
+	enum bpf_attach_type attach_type;
+	/* Socket properties */
+	int domain;
+	int type;
+	/* IP:port pairs for BPF prog to override */
+	const char *requested_ip;
+	unsigned short requested_port;
+	const char *expected_ip;
+	unsigned short expected_port;
+	const char *expected_src_ip;
+	/* Expected test result */
+	enum {
+		LOAD_REJECT,
+		ATTACH_REJECT,
+		ATTACH_OKAY,
+		SYSCALL_EPERM,
+		SYSCALL_ENOTSUPP,
+		SUCCESS,
+	} expected_result;
+};
+
+static int bind4_prog_load(const struct sock_addr_test *test);
+static int bind6_prog_load(const struct sock_addr_test *test);
+static int connect4_prog_load(const struct sock_addr_test *test);
+static int connect6_prog_load(const struct sock_addr_test *test);
+static int sendmsg_allow_prog_load(const struct sock_addr_test *test);
+static int sendmsg_deny_prog_load(const struct sock_addr_test *test);
+static int recvmsg_allow_prog_load(const struct sock_addr_test *test);
+static int recvmsg_deny_prog_load(const struct sock_addr_test *test);
+static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
+static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test);
+static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test);
+static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
+static int recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test);
+static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test);
+static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test);
+static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test);
+
+static struct sock_addr_test tests[] = {
+	/* bind */
+	{
+		"bind4: load prog with wrong expected attach type",
+		bind4_prog_load,
+		BPF_CGROUP_INET6_BIND,
+		BPF_CGROUP_INET4_BIND,
+		AF_INET,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"bind4: attach prog with wrong attach type",
+		bind4_prog_load,
+		BPF_CGROUP_INET4_BIND,
+		BPF_CGROUP_INET6_BIND,
+		AF_INET,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_REJECT,
+	},
+	{
+		"bind4: rewrite IP & TCP port in",
+		bind4_prog_load,
+		BPF_CGROUP_INET4_BIND,
+		BPF_CGROUP_INET4_BIND,
+		AF_INET,
+		SOCK_STREAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		NULL,
+		SUCCESS,
+	},
+	{
+		"bind4: rewrite IP & UDP port in",
+		bind4_prog_load,
+		BPF_CGROUP_INET4_BIND,
+		BPF_CGROUP_INET4_BIND,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		NULL,
+		SUCCESS,
+	},
+	{
+		"bind6: load prog with wrong expected attach type",
+		bind6_prog_load,
+		BPF_CGROUP_INET4_BIND,
+		BPF_CGROUP_INET6_BIND,
+		AF_INET6,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"bind6: attach prog with wrong attach type",
+		bind6_prog_load,
+		BPF_CGROUP_INET6_BIND,
+		BPF_CGROUP_INET4_BIND,
+		AF_INET,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_REJECT,
+	},
+	{
+		"bind6: rewrite IP & TCP port in",
+		bind6_prog_load,
+		BPF_CGROUP_INET6_BIND,
+		BPF_CGROUP_INET6_BIND,
+		AF_INET6,
+		SOCK_STREAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		NULL,
+		SUCCESS,
+	},
+	{
+		"bind6: rewrite IP & UDP port in",
+		bind6_prog_load,
+		BPF_CGROUP_INET6_BIND,
+		BPF_CGROUP_INET6_BIND,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		NULL,
+		SUCCESS,
+	},
+
+	/* connect */
+	{
+		"connect4: load prog with wrong expected attach type",
+		connect4_prog_load,
+		BPF_CGROUP_INET6_CONNECT,
+		BPF_CGROUP_INET4_CONNECT,
+		AF_INET,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"connect4: attach prog with wrong attach type",
+		connect4_prog_load,
+		BPF_CGROUP_INET4_CONNECT,
+		BPF_CGROUP_INET6_CONNECT,
+		AF_INET,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_REJECT,
+	},
+	{
+		"connect4: rewrite IP & TCP port",
+		connect4_prog_load,
+		BPF_CGROUP_INET4_CONNECT,
+		BPF_CGROUP_INET4_CONNECT,
+		AF_INET,
+		SOCK_STREAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"connect4: rewrite IP & UDP port",
+		connect4_prog_load,
+		BPF_CGROUP_INET4_CONNECT,
+		BPF_CGROUP_INET4_CONNECT,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"connect6: load prog with wrong expected attach type",
+		connect6_prog_load,
+		BPF_CGROUP_INET4_CONNECT,
+		BPF_CGROUP_INET6_CONNECT,
+		AF_INET6,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"connect6: attach prog with wrong attach type",
+		connect6_prog_load,
+		BPF_CGROUP_INET6_CONNECT,
+		BPF_CGROUP_INET4_CONNECT,
+		AF_INET,
+		SOCK_STREAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_REJECT,
+	},
+	{
+		"connect6: rewrite IP & TCP port",
+		connect6_prog_load,
+		BPF_CGROUP_INET6_CONNECT,
+		BPF_CGROUP_INET6_CONNECT,
+		AF_INET6,
+		SOCK_STREAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"connect6: rewrite IP & UDP port",
+		connect6_prog_load,
+		BPF_CGROUP_INET6_CONNECT,
+		BPF_CGROUP_INET6_CONNECT,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SUCCESS,
+	},
+
+	/* sendmsg */
+	{
+		"sendmsg4: load prog with wrong expected attach type",
+		sendmsg4_rw_asm_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP4_SENDMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"sendmsg4: attach prog with wrong attach type",
+		sendmsg4_rw_asm_prog_load,
+		BPF_CGROUP_UDP4_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_REJECT,
+	},
+	{
+		"sendmsg4: rewrite IP & port (asm)",
+		sendmsg4_rw_asm_prog_load,
+		BPF_CGROUP_UDP4_SENDMSG,
+		BPF_CGROUP_UDP4_SENDMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"sendmsg4: rewrite IP & port (C)",
+		sendmsg4_rw_c_prog_load,
+		BPF_CGROUP_UDP4_SENDMSG,
+		BPF_CGROUP_UDP4_SENDMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"sendmsg4: deny call",
+		sendmsg_deny_prog_load,
+		BPF_CGROUP_UDP4_SENDMSG,
+		BPF_CGROUP_UDP4_SENDMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_IP,
+		SERV4_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SRC4_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
+	{
+		"sendmsg6: load prog with wrong expected attach type",
+		sendmsg6_rw_asm_prog_load,
+		BPF_CGROUP_UDP4_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"sendmsg6: attach prog with wrong attach type",
+		sendmsg6_rw_asm_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP4_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_REJECT,
+	},
+	{
+		"sendmsg6: rewrite IP & port (asm)",
+		sendmsg6_rw_asm_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"sendmsg6: rewrite IP & port (C)",
+		sendmsg6_rw_c_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"sendmsg6: IPv4-mapped IPv6",
+		sendmsg6_rw_v4mapped_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SYSCALL_ENOTSUPP,
+	},
+	{
+		"sendmsg6: set dst IP = [::] (BSD'ism)",
+		sendmsg6_rw_wildcard_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SUCCESS,
+	},
+	{
+		"sendmsg6: preserve dst IP = [::] (BSD'ism)",
+		sendmsg_allow_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		WILDCARD6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_PORT,
+		SRC6_IP,
+		SUCCESS,
+	},
+	{
+		"sendmsg6: deny call",
+		sendmsg_deny_prog_load,
+		BPF_CGROUP_UDP6_SENDMSG,
+		BPF_CGROUP_UDP6_SENDMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_IP,
+		SERV6_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SRC6_REWRITE_IP,
+		SYSCALL_EPERM,
+	},
+
+	/* recvmsg */
+	{
+		"recvmsg4: return code ok",
+		recvmsg_allow_prog_load,
+		BPF_CGROUP_UDP4_RECVMSG,
+		BPF_CGROUP_UDP4_RECVMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_OKAY,
+	},
+	{
+		"recvmsg4: return code !ok",
+		recvmsg_deny_prog_load,
+		BPF_CGROUP_UDP4_RECVMSG,
+		BPF_CGROUP_UDP4_RECVMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"recvmsg6: return code ok",
+		recvmsg_allow_prog_load,
+		BPF_CGROUP_UDP6_RECVMSG,
+		BPF_CGROUP_UDP6_RECVMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		ATTACH_OKAY,
+	},
+	{
+		"recvmsg6: return code !ok",
+		recvmsg_deny_prog_load,
+		BPF_CGROUP_UDP6_RECVMSG,
+		BPF_CGROUP_UDP6_RECVMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		NULL,
+		0,
+		NULL,
+		0,
+		NULL,
+		LOAD_REJECT,
+	},
+	{
+		"recvmsg4: rewrite IP & port (asm)",
+		recvmsg4_rw_asm_prog_load,
+		BPF_CGROUP_UDP4_RECVMSG,
+		BPF_CGROUP_UDP4_RECVMSG,
+		AF_INET,
+		SOCK_DGRAM,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SERV4_REWRITE_IP,
+		SERV4_REWRITE_PORT,
+		SERV4_IP,
+		SUCCESS,
+	},
+	{
+		"recvmsg6: rewrite IP & port (asm)",
+		recvmsg6_rw_asm_prog_load,
+		BPF_CGROUP_UDP6_RECVMSG,
+		BPF_CGROUP_UDP6_RECVMSG,
+		AF_INET6,
+		SOCK_DGRAM,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SERV6_REWRITE_IP,
+		SERV6_REWRITE_PORT,
+		SERV6_IP,
+		SUCCESS,
+	},
+};
+
+static int mk_sockaddr(int domain, const char *ip, unsigned short port,
+		       struct sockaddr *addr, socklen_t addr_len)
+{
+	struct sockaddr_in6 *addr6;
+	struct sockaddr_in *addr4;
+
+	if (domain != AF_INET && domain != AF_INET6) {
+		log_err("Unsupported address family");
+		return -1;
+	}
+
+	memset(addr, 0, addr_len);
+
+	if (domain == AF_INET) {
+		if (addr_len < sizeof(struct sockaddr_in))
+			return -1;
+		addr4 = (struct sockaddr_in *)addr;
+		addr4->sin_family = domain;
+		addr4->sin_port = htons(port);
+		if (inet_pton(domain, ip, (void *)&addr4->sin_addr) != 1) {
+			log_err("Invalid IPv4: %s", ip);
+			return -1;
+		}
+	} else if (domain == AF_INET6) {
+		if (addr_len < sizeof(struct sockaddr_in6))
+			return -1;
+		addr6 = (struct sockaddr_in6 *)addr;
+		addr6->sin6_family = domain;
+		addr6->sin6_port = htons(port);
+		if (inet_pton(domain, ip, (void *)&addr6->sin6_addr) != 1) {
+			log_err("Invalid IPv6: %s", ip);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static int load_insns(const struct sock_addr_test *test,
+		      const struct bpf_insn *insns, size_t insns_cnt)
+{
+	struct bpf_load_program_attr load_attr;
+	int ret;
+
+	memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
+	load_attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
+	load_attr.expected_attach_type = test->expected_attach_type;
+	load_attr.insns = insns;
+	load_attr.insns_cnt = insns_cnt;
+	load_attr.license = "GPL";
+
+	ret = bpf_load_program_xattr(&load_attr, bpf_log_buf, BPF_LOG_BUF_SIZE);
+	if (ret < 0 && test->expected_result != LOAD_REJECT) {
+		log_err(">>> Loading program error.\n"
+			">>> Verifier output:\n%s\n-------\n", bpf_log_buf);
+	}
+
+	return ret;
+}
+
+/* [1] These testing programs try to read different context fields, including
+ * narrow loads of different sizes from user_ip4 and user_ip6, and write to
+ * those allowed to be overridden.
+ *
+ * [2] BPF_LD_IMM64 & BPF_JMP_REG are used below whenever there is a need to
+ * compare a register with unsigned 32bit integer. BPF_JMP_IMM can't be used
+ * in such cases since it accepts only _signed_ 32bit integer as IMM
+ * argument. Also note that BPF_LD_IMM64 contains 2 instructions what matters
+ * to count jumps properly.
+ */
+
+static int bind4_prog_load(const struct sock_addr_test *test)
+{
+	union {
+		uint8_t u4_addr8[4];
+		uint16_t u4_addr16[2];
+		uint32_t u4_addr32;
+	} ip4, port;
+	struct sockaddr_in addr4_rw;
+
+	if (inet_pton(AF_INET, SERV4_IP, (void *)&ip4) != 1) {
+		log_err("Invalid IPv4: %s", SERV4_IP);
+		return -1;
+	}
+
+	port.u4_addr32 = htons(SERV4_PORT);
+
+	if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
+			(struct sockaddr *)&addr4_rw, sizeof(addr4_rw)) == -1)
+		return -1;
+
+	/* See [1]. */
+	struct bpf_insn insns[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+		/* if (sk.family == AF_INET && */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, family)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 32),
+
+		/*     (sk.type == SOCK_DGRAM || sk.type == SOCK_STREAM) && */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, type)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 1),
+		BPF_JMP_A(1),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_STREAM, 28),
+
+		/*     1st_byte_of_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[0], 26),
+
+		/*     2nd_byte_of_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4) + 1),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[1], 24),
+
+		/*     3rd_byte_of_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4) + 2),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[2], 22),
+
+		/*     4th_byte_of_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4) + 3),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr8[3], 20),
+
+		/*     1st_half_of_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[0], 18),
+
+		/*     2nd_half_of_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4) + 2),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip4.u4_addr16[1], 16),
+
+		/*     whole_user_ip4 == expected && */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip4)),
+		BPF_LD_IMM64(BPF_REG_8, ip4.u4_addr32), /* See [2]. */
+		BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 12),
+
+		/*     1st_byte_of_user_port == expected && */
+		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, port.u4_addr8[0], 10),
+
+		/*     1st_half_of_user_port == expected && */
+		BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, port.u4_addr16[0], 8),
+
+		/*     user_port == expected) { */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		BPF_LD_IMM64(BPF_REG_8, port.u4_addr32), /* See [2]. */
+		BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 4),
+
+		/*      user_ip4 = addr4_rw.sin_addr */
+		BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_addr.s_addr),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_ip4)),
+
+		/*      user_port = addr4_rw.sin_port */
+		BPF_MOV32_IMM(BPF_REG_7, addr4_rw.sin_port),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		/* } */
+
+		/* return 1 */
+		BPF_MOV64_IMM(BPF_REG_0, 1),
+		BPF_EXIT_INSN(),
+	};
+
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int bind6_prog_load(const struct sock_addr_test *test)
+{
+	struct sockaddr_in6 addr6_rw;
+	struct in6_addr ip6;
+
+	if (inet_pton(AF_INET6, SERV6_IP, (void *)&ip6) != 1) {
+		log_err("Invalid IPv6: %s", SERV6_IP);
+		return -1;
+	}
+
+	if (mk_sockaddr(AF_INET6, SERV6_REWRITE_IP, SERV6_REWRITE_PORT,
+			(struct sockaddr *)&addr6_rw, sizeof(addr6_rw)) == -1)
+		return -1;
+
+	/* See [1]. */
+	struct bpf_insn insns[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+		/* if (sk.family == AF_INET6 && */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, family)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
+
+		/*            5th_byte_of_user_ip6 == expected && */
+		BPF_LDX_MEM(BPF_B, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip6[1])),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr[4], 16),
+
+		/*            3rd_half_of_user_ip6 == expected && */
+		BPF_LDX_MEM(BPF_H, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip6[1])),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, ip6.s6_addr16[2], 14),
+
+		/*            last_word_of_user_ip6 == expected) { */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, user_ip6[3])),
+		BPF_LD_IMM64(BPF_REG_8, ip6.s6_addr32[3]),  /* See [2]. */
+		BPF_JMP_REG(BPF_JNE, BPF_REG_7, BPF_REG_8, 10),
+
+
+#define STORE_IPV6_WORD(N)						       \
+		BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_addr.s6_addr32[N]),     \
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,		       \
+			    offsetof(struct bpf_sock_addr, user_ip6[N]))
+
+		/*      user_ip6 = addr6_rw.sin6_addr */
+		STORE_IPV6_WORD(0),
+		STORE_IPV6_WORD(1),
+		STORE_IPV6_WORD(2),
+		STORE_IPV6_WORD(3),
+
+		/*      user_port = addr6_rw.sin6_port */
+		BPF_MOV32_IMM(BPF_REG_7, addr6_rw.sin6_port),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_port)),
+
+		/* } */
+
+		/* return 1 */
+		BPF_MOV64_IMM(BPF_REG_0, 1),
+		BPF_EXIT_INSN(),
+	};
+
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int load_path(const struct sock_addr_test *test, const char *path)
+{
+	struct bpf_prog_load_attr attr;
+	struct bpf_object *obj;
+	int prog_fd;
+
+	memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
+	attr.file = path;
+	attr.prog_type = BPF_PROG_TYPE_CGROUP_SOCK_ADDR;
+	attr.expected_attach_type = test->expected_attach_type;
+	attr.prog_flags = BPF_F_TEST_RND_HI32;
+
+	if (bpf_prog_load_xattr(&attr, &obj, &prog_fd)) {
+		if (test->expected_result != LOAD_REJECT)
+			log_err(">>> Loading program (%s) error.\n", path);
+		return -1;
+	}
+
+	return prog_fd;
+}
+
+static int connect4_prog_load(const struct sock_addr_test *test)
+{
+	return load_path(test, CONNECT4_PROG_PATH);
+}
+
+static int connect6_prog_load(const struct sock_addr_test *test)
+{
+	return load_path(test, CONNECT6_PROG_PATH);
+}
+
+static int xmsg_ret_only_prog_load(const struct sock_addr_test *test,
+				   int32_t rc)
+{
+	struct bpf_insn insns[] = {
+		/* return rc */
+		BPF_MOV64_IMM(BPF_REG_0, rc),
+		BPF_EXIT_INSN(),
+	};
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int sendmsg_allow_prog_load(const struct sock_addr_test *test)
+{
+	return xmsg_ret_only_prog_load(test, /*rc*/ 1);
+}
+
+static int sendmsg_deny_prog_load(const struct sock_addr_test *test)
+{
+	return xmsg_ret_only_prog_load(test, /*rc*/ 0);
+}
+
+static int recvmsg_allow_prog_load(const struct sock_addr_test *test)
+{
+	return xmsg_ret_only_prog_load(test, /*rc*/ 1);
+}
+
+static int recvmsg_deny_prog_load(const struct sock_addr_test *test)
+{
+	return xmsg_ret_only_prog_load(test, /*rc*/ 0);
+}
+
+static int sendmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
+{
+	struct sockaddr_in dst4_rw_addr;
+	struct in_addr src4_rw_ip;
+
+	if (inet_pton(AF_INET, SRC4_REWRITE_IP, (void *)&src4_rw_ip) != 1) {
+		log_err("Invalid IPv4: %s", SRC4_REWRITE_IP);
+		return -1;
+	}
+
+	if (mk_sockaddr(AF_INET, SERV4_REWRITE_IP, SERV4_REWRITE_PORT,
+			(struct sockaddr *)&dst4_rw_addr,
+			sizeof(dst4_rw_addr)) == -1)
+		return -1;
+
+	struct bpf_insn insns[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+		/* if (sk.family == AF_INET && */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, family)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 8),
+
+		/*     sk.type == SOCK_DGRAM)  { */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, type)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 6),
+
+		/*      msg_src_ip4 = src4_rw_ip */
+		BPF_MOV32_IMM(BPF_REG_7, src4_rw_ip.s_addr),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, msg_src_ip4)),
+
+		/*      user_ip4 = dst4_rw_addr.sin_addr */
+		BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_addr.s_addr),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_ip4)),
+
+		/*      user_port = dst4_rw_addr.sin_port */
+		BPF_MOV32_IMM(BPF_REG_7, dst4_rw_addr.sin_port),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		/* } */
+
+		/* return 1 */
+		BPF_MOV64_IMM(BPF_REG_0, 1),
+		BPF_EXIT_INSN(),
+	};
+
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int recvmsg4_rw_asm_prog_load(const struct sock_addr_test *test)
+{
+	struct sockaddr_in src4_rw_addr;
+
+	if (mk_sockaddr(AF_INET, SERV4_IP, SERV4_PORT,
+			(struct sockaddr *)&src4_rw_addr,
+			sizeof(src4_rw_addr)) == -1)
+		return -1;
+
+	struct bpf_insn insns[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+		/* if (sk.family == AF_INET && */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, family)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET, 6),
+
+		/*     sk.type == SOCK_DGRAM)  { */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, type)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, SOCK_DGRAM, 4),
+
+		/*      user_ip4 = src4_rw_addr.sin_addr */
+		BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_addr.s_addr),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_ip4)),
+
+		/*      user_port = src4_rw_addr.sin_port */
+		BPF_MOV32_IMM(BPF_REG_7, src4_rw_addr.sin_port),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		/* } */
+
+		/* return 1 */
+		BPF_MOV64_IMM(BPF_REG_0, 1),
+		BPF_EXIT_INSN(),
+	};
+
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int sendmsg4_rw_c_prog_load(const struct sock_addr_test *test)
+{
+	return load_path(test, SENDMSG4_PROG_PATH);
+}
+
+static int sendmsg6_rw_dst_asm_prog_load(const struct sock_addr_test *test,
+					 const char *rw_dst_ip)
+{
+	struct sockaddr_in6 dst6_rw_addr;
+	struct in6_addr src6_rw_ip;
+
+	if (inet_pton(AF_INET6, SRC6_REWRITE_IP, (void *)&src6_rw_ip) != 1) {
+		log_err("Invalid IPv6: %s", SRC6_REWRITE_IP);
+		return -1;
+	}
+
+	if (mk_sockaddr(AF_INET6, rw_dst_ip, SERV6_REWRITE_PORT,
+			(struct sockaddr *)&dst6_rw_addr,
+			sizeof(dst6_rw_addr)) == -1)
+		return -1;
+
+	struct bpf_insn insns[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+		/* if (sk.family == AF_INET6) { */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, family)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 18),
+
+#define STORE_IPV6_WORD_N(DST, SRC, N)					       \
+		BPF_MOV32_IMM(BPF_REG_7, SRC[N]),			       \
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,		       \
+			    offsetof(struct bpf_sock_addr, DST[N]))
+
+#define STORE_IPV6(DST, SRC)						       \
+		STORE_IPV6_WORD_N(DST, SRC, 0),				       \
+		STORE_IPV6_WORD_N(DST, SRC, 1),				       \
+		STORE_IPV6_WORD_N(DST, SRC, 2),				       \
+		STORE_IPV6_WORD_N(DST, SRC, 3)
+
+		STORE_IPV6(msg_src_ip6, src6_rw_ip.s6_addr32),
+		STORE_IPV6(user_ip6, dst6_rw_addr.sin6_addr.s6_addr32),
+
+		/*      user_port = dst6_rw_addr.sin6_port */
+		BPF_MOV32_IMM(BPF_REG_7, dst6_rw_addr.sin6_port),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_port)),
+
+		/* } */
+
+		/* return 1 */
+		BPF_MOV64_IMM(BPF_REG_0, 1),
+		BPF_EXIT_INSN(),
+	};
+
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int sendmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
+{
+	return sendmsg6_rw_dst_asm_prog_load(test, SERV6_REWRITE_IP);
+}
+
+static int recvmsg6_rw_asm_prog_load(const struct sock_addr_test *test)
+{
+	struct sockaddr_in6 src6_rw_addr;
+
+	if (mk_sockaddr(AF_INET6, SERV6_IP, SERV6_PORT,
+			(struct sockaddr *)&src6_rw_addr,
+			sizeof(src6_rw_addr)) == -1)
+		return -1;
+
+	struct bpf_insn insns[] = {
+		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+
+		/* if (sk.family == AF_INET6) { */
+		BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
+			    offsetof(struct bpf_sock_addr, family)),
+		BPF_JMP_IMM(BPF_JNE, BPF_REG_7, AF_INET6, 10),
+
+		STORE_IPV6(user_ip6, src6_rw_addr.sin6_addr.s6_addr32),
+
+		/*      user_port = dst6_rw_addr.sin6_port */
+		BPF_MOV32_IMM(BPF_REG_7, src6_rw_addr.sin6_port),
+		BPF_STX_MEM(BPF_W, BPF_REG_6, BPF_REG_7,
+			    offsetof(struct bpf_sock_addr, user_port)),
+		/* } */
+
+		/* return 1 */
+		BPF_MOV64_IMM(BPF_REG_0, 1),
+		BPF_EXIT_INSN(),
+	};
+
+	return load_insns(test, insns, sizeof(insns) / sizeof(struct bpf_insn));
+}
+
+static int sendmsg6_rw_v4mapped_prog_load(const struct sock_addr_test *test)
+{
+	return sendmsg6_rw_dst_asm_prog_load(test, SERV6_V4MAPPED_IP);
+}
+
+static int sendmsg6_rw_wildcard_prog_load(const struct sock_addr_test *test)
+{
+	return sendmsg6_rw_dst_asm_prog_load(test, WILDCARD6_IP);
+}
+
+static int sendmsg6_rw_c_prog_load(const struct sock_addr_test *test)
+{
+	return load_path(test, SENDMSG6_PROG_PATH);
+}
+
+static int cmp_addr(const struct sockaddr_storage *addr1,
+		    const struct sockaddr_storage *addr2, int cmp_port)
+{
+	const struct sockaddr_in *four1, *four2;
+	const struct sockaddr_in6 *six1, *six2;
+
+	if (addr1->ss_family != addr2->ss_family)
+		return -1;
+
+	if (addr1->ss_family == AF_INET) {
+		four1 = (const struct sockaddr_in *)addr1;
+		four2 = (const struct sockaddr_in *)addr2;
+		return !((four1->sin_port == four2->sin_port || !cmp_port) &&
+			 four1->sin_addr.s_addr == four2->sin_addr.s_addr);
+	} else if (addr1->ss_family == AF_INET6) {
+		six1 = (const struct sockaddr_in6 *)addr1;
+		six2 = (const struct sockaddr_in6 *)addr2;
+		return !((six1->sin6_port == six2->sin6_port || !cmp_port) &&
+			 !memcmp(&six1->sin6_addr, &six2->sin6_addr,
+				 sizeof(struct in6_addr)));
+	}
+
+	return -1;
+}
+
+static int cmp_sock_addr(info_fn fn, int sock1,
+			 const struct sockaddr_storage *addr2, int cmp_port)
+{
+	struct sockaddr_storage addr1;
+	socklen_t len1 = sizeof(addr1);
+
+	memset(&addr1, 0, len1);
+	if (fn(sock1, (struct sockaddr *)&addr1, (socklen_t *)&len1) != 0)
+		return -1;
+
+	return cmp_addr(&addr1, addr2, cmp_port);
+}
+
+static int cmp_local_ip(int sock1, const struct sockaddr_storage *addr2)
+{
+	return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 0);
+}
+
+static int cmp_local_addr(int sock1, const struct sockaddr_storage *addr2)
+{
+	return cmp_sock_addr(getsockname, sock1, addr2, /*cmp_port*/ 1);
+}
+
+static int cmp_peer_addr(int sock1, const struct sockaddr_storage *addr2)
+{
+	return cmp_sock_addr(getpeername, sock1, addr2, /*cmp_port*/ 1);
+}
+
+static int start_server(int type, const struct sockaddr_storage *addr,
+			socklen_t addr_len)
+{
+	int fd;
+
+	fd = socket(addr->ss_family, type, 0);
+	if (fd == -1) {
+		log_err("Failed to create server socket");
+		goto out;
+	}
+
+	if (bind(fd, (const struct sockaddr *)addr, addr_len) == -1) {
+		log_err("Failed to bind server socket");
+		goto close_out;
+	}
+
+	if (type == SOCK_STREAM) {
+		if (listen(fd, 128) == -1) {
+			log_err("Failed to listen on server socket");
+			goto close_out;
+		}
+	}
+
+	goto out;
+close_out:
+	close(fd);
+	fd = -1;
+out:
+	return fd;
+}
+
+static int connect_to_server(int type, const struct sockaddr_storage *addr,
+			     socklen_t addr_len)
+{
+	int domain;
+	int fd = -1;
+
+	domain = addr->ss_family;
+
+	if (domain != AF_INET && domain != AF_INET6) {
+		log_err("Unsupported address family");
+		goto err;
+	}
+
+	fd = socket(domain, type, 0);
+	if (fd == -1) {
+		log_err("Failed to create client socket");
+		goto err;
+	}
+
+	if (connect(fd, (const struct sockaddr *)addr, addr_len) == -1) {
+		log_err("Fail to connect to server");
+		goto err;
+	}
+
+	goto out;
+err:
+	close(fd);
+	fd = -1;
+out:
+	return fd;
+}
+
+int init_pktinfo(int domain, struct cmsghdr *cmsg)
+{
+	struct in6_pktinfo *pktinfo6;
+	struct in_pktinfo *pktinfo4;
+
+	if (domain == AF_INET) {
+		cmsg->cmsg_level = SOL_IP;
+		cmsg->cmsg_type = IP_PKTINFO;
+		cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
+		pktinfo4 = (struct in_pktinfo *)CMSG_DATA(cmsg);
+		memset(pktinfo4, 0, sizeof(struct in_pktinfo));
+		if (inet_pton(domain, SRC4_IP,
+			      (void *)&pktinfo4->ipi_spec_dst) != 1)
+			return -1;
+	} else if (domain == AF_INET6) {
+		cmsg->cmsg_level = SOL_IPV6;
+		cmsg->cmsg_type = IPV6_PKTINFO;
+		cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
+		pktinfo6 = (struct in6_pktinfo *)CMSG_DATA(cmsg);
+		memset(pktinfo6, 0, sizeof(struct in6_pktinfo));
+		if (inet_pton(domain, SRC6_IP,
+			      (void *)&pktinfo6->ipi6_addr) != 1)
+			return -1;
+	} else {
+		return -1;
+	}
+
+	return 0;
+}
+
+static int sendmsg_to_server(int type, const struct sockaddr_storage *addr,
+			     socklen_t addr_len, int set_cmsg, int flags,
+			     int *syscall_err)
+{
+	union {
+		char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+		struct cmsghdr align;
+	} control6;
+	union {
+		char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
+		struct cmsghdr align;
+	} control4;
+	struct msghdr hdr;
+	struct iovec iov;
+	char data = 'a';
+	int domain;
+	int fd = -1;
+
+	domain = addr->ss_family;
+
+	if (domain != AF_INET && domain != AF_INET6) {
+		log_err("Unsupported address family");
+		goto err;
+	}
+
+	fd = socket(domain, type, 0);
+	if (fd == -1) {
+		log_err("Failed to create client socket");
+		goto err;
+	}
+
+	memset(&iov, 0, sizeof(iov));
+	iov.iov_base = &data;
+	iov.iov_len = sizeof(data);
+
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.msg_name = (void *)addr;
+	hdr.msg_namelen = addr_len;
+	hdr.msg_iov = &iov;
+	hdr.msg_iovlen = 1;
+
+	if (set_cmsg) {
+		if (domain == AF_INET) {
+			hdr.msg_control = &control4;
+			hdr.msg_controllen = sizeof(control4.buf);
+		} else if (domain == AF_INET6) {
+			hdr.msg_control = &control6;
+			hdr.msg_controllen = sizeof(control6.buf);
+		}
+		if (init_pktinfo(domain, CMSG_FIRSTHDR(&hdr))) {
+			log_err("Fail to init pktinfo");
+			goto err;
+		}
+	}
+
+	if (sendmsg(fd, &hdr, flags) != sizeof(data)) {
+		log_err("Fail to send message to server");
+		*syscall_err = errno;
+		goto err;
+	}
+
+	goto out;
+err:
+	close(fd);
+	fd = -1;
+out:
+	return fd;
+}
+
+static int fastconnect_to_server(const struct sockaddr_storage *addr,
+				 socklen_t addr_len)
+{
+	int sendmsg_err;
+
+	return sendmsg_to_server(SOCK_STREAM, addr, addr_len, /*set_cmsg*/0,
+				 MSG_FASTOPEN, &sendmsg_err);
+}
+
+static int recvmsg_from_client(int sockfd, struct sockaddr_storage *src_addr)
+{
+	struct timeval tv;
+	struct msghdr hdr;
+	struct iovec iov;
+	char data[64];
+	fd_set rfds;
+
+	FD_ZERO(&rfds);
+	FD_SET(sockfd, &rfds);
+
+	tv.tv_sec = 2;
+	tv.tv_usec = 0;
+
+	if (select(sockfd + 1, &rfds, NULL, NULL, &tv) <= 0 ||
+	    !FD_ISSET(sockfd, &rfds))
+		return -1;
+
+	memset(&iov, 0, sizeof(iov));
+	iov.iov_base = data;
+	iov.iov_len = sizeof(data);
+
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.msg_name = src_addr;
+	hdr.msg_namelen = sizeof(struct sockaddr_storage);
+	hdr.msg_iov = &iov;
+	hdr.msg_iovlen = 1;
+
+	return recvmsg(sockfd, &hdr, 0);
+}
+
+static int init_addrs(const struct sock_addr_test *test,
+		      struct sockaddr_storage *requested_addr,
+		      struct sockaddr_storage *expected_addr,
+		      struct sockaddr_storage *expected_src_addr)
+{
+	socklen_t addr_len = sizeof(struct sockaddr_storage);
+
+	if (mk_sockaddr(test->domain, test->expected_ip, test->expected_port,
+			(struct sockaddr *)expected_addr, addr_len) == -1)
+		goto err;
+
+	if (mk_sockaddr(test->domain, test->requested_ip, test->requested_port,
+			(struct sockaddr *)requested_addr, addr_len) == -1)
+		goto err;
+
+	if (test->expected_src_ip &&
+	    mk_sockaddr(test->domain, test->expected_src_ip, 0,
+			(struct sockaddr *)expected_src_addr, addr_len) == -1)
+		goto err;
+
+	return 0;
+err:
+	return -1;
+}
+
+static int run_bind_test_case(const struct sock_addr_test *test)
+{
+	socklen_t addr_len = sizeof(struct sockaddr_storage);
+	struct sockaddr_storage requested_addr;
+	struct sockaddr_storage expected_addr;
+	int clientfd = -1;
+	int servfd = -1;
+	int err = 0;
+
+	if (init_addrs(test, &requested_addr, &expected_addr, NULL))
+		goto err;
+
+	servfd = start_server(test->type, &requested_addr, addr_len);
+	if (servfd == -1)
+		goto err;
+
+	if (cmp_local_addr(servfd, &expected_addr))
+		goto err;
+
+	/* Try to connect to server just in case */
+	clientfd = connect_to_server(test->type, &expected_addr, addr_len);
+	if (clientfd == -1)
+		goto err;
+
+	goto out;
+err:
+	err = -1;
+out:
+	close(clientfd);
+	close(servfd);
+	return err;
+}
+
+static int run_connect_test_case(const struct sock_addr_test *test)
+{
+	socklen_t addr_len = sizeof(struct sockaddr_storage);
+	struct sockaddr_storage expected_src_addr;
+	struct sockaddr_storage requested_addr;
+	struct sockaddr_storage expected_addr;
+	int clientfd = -1;
+	int servfd = -1;
+	int err = 0;
+
+	if (init_addrs(test, &requested_addr, &expected_addr,
+		       &expected_src_addr))
+		goto err;
+
+	/* Prepare server to connect to */
+	servfd = start_server(test->type, &expected_addr, addr_len);
+	if (servfd == -1)
+		goto err;
+
+	clientfd = connect_to_server(test->type, &requested_addr, addr_len);
+	if (clientfd == -1)
+		goto err;
+
+	/* Make sure src and dst addrs were overridden properly */
+	if (cmp_peer_addr(clientfd, &expected_addr))
+		goto err;
+
+	if (cmp_local_ip(clientfd, &expected_src_addr))
+		goto err;
+
+	if (test->type == SOCK_STREAM) {
+		/* Test TCP Fast Open scenario */
+		clientfd = fastconnect_to_server(&requested_addr, addr_len);
+		if (clientfd == -1)
+			goto err;
+
+		/* Make sure src and dst addrs were overridden properly */
+		if (cmp_peer_addr(clientfd, &expected_addr))
+			goto err;
+
+		if (cmp_local_ip(clientfd, &expected_src_addr))
+			goto err;
+	}
+
+	goto out;
+err:
+	err = -1;
+out:
+	close(clientfd);
+	close(servfd);
+	return err;
+}
+
+static int run_xmsg_test_case(const struct sock_addr_test *test, int max_cmsg)
+{
+	socklen_t addr_len = sizeof(struct sockaddr_storage);
+	struct sockaddr_storage expected_addr;
+	struct sockaddr_storage server_addr;
+	struct sockaddr_storage sendmsg_addr;
+	struct sockaddr_storage recvmsg_addr;
+	int clientfd = -1;
+	int servfd = -1;
+	int set_cmsg;
+	int err = 0;
+
+	if (test->type != SOCK_DGRAM)
+		goto err;
+
+	if (init_addrs(test, &sendmsg_addr, &server_addr, &expected_addr))
+		goto err;
+
+	/* Prepare server to sendmsg to */
+	servfd = start_server(test->type, &server_addr, addr_len);
+	if (servfd == -1)
+		goto err;
+
+	for (set_cmsg = 0; set_cmsg <= max_cmsg; ++set_cmsg) {
+		if (clientfd >= 0)
+			close(clientfd);
+
+		clientfd = sendmsg_to_server(test->type, &sendmsg_addr,
+					     addr_len, set_cmsg, /*flags*/0,
+					     &err);
+		if (err)
+			goto out;
+		else if (clientfd == -1)
+			goto err;
+
+		/* Try to receive message on server instead of using
+		 * getpeername(2) on client socket, to check that client's
+		 * destination address was rewritten properly, since
+		 * getpeername(2) doesn't work with unconnected datagram
+		 * sockets.
+		 *
+		 * Get source address from recvmsg(2) as well to make sure
+		 * source was rewritten properly: getsockname(2) can't be used
+		 * since socket is unconnected and source defined for one
+		 * specific packet may differ from the one used by default and
+		 * returned by getsockname(2).
+		 */
+		if (recvmsg_from_client(servfd, &recvmsg_addr) == -1)
+			goto err;
+
+		if (cmp_addr(&recvmsg_addr, &expected_addr, /*cmp_port*/0))
+			goto err;
+	}
+
+	goto out;
+err:
+	err = -1;
+out:
+	close(clientfd);
+	close(servfd);
+	return err;
+}
+
+static int run_test_case(int cgfd, const struct sock_addr_test *test)
+{
+	int progfd = -1;
+	int err = 0;
+
+	printf("Test case: %s .. ", test->descr);
+
+	progfd = test->loadfn(test);
+	if (test->expected_result == LOAD_REJECT && progfd < 0)
+		goto out;
+	else if (test->expected_result == LOAD_REJECT || progfd < 0)
+		goto err;
+
+	err = bpf_prog_attach(progfd, cgfd, test->attach_type,
+			      BPF_F_ALLOW_OVERRIDE);
+	if (test->expected_result == ATTACH_REJECT && err) {
+		err = 0; /* error was expected, reset it */
+		goto out;
+	} else if (test->expected_result == ATTACH_REJECT || err) {
+		goto err;
+	} else if (test->expected_result == ATTACH_OKAY) {
+		err = 0;
+		goto out;
+	}
+
+	switch (test->attach_type) {
+	case BPF_CGROUP_INET4_BIND:
+	case BPF_CGROUP_INET6_BIND:
+		err = run_bind_test_case(test);
+		break;
+	case BPF_CGROUP_INET4_CONNECT:
+	case BPF_CGROUP_INET6_CONNECT:
+		err = run_connect_test_case(test);
+		break;
+	case BPF_CGROUP_UDP4_SENDMSG:
+	case BPF_CGROUP_UDP6_SENDMSG:
+		err = run_xmsg_test_case(test, 1);
+		break;
+	case BPF_CGROUP_UDP4_RECVMSG:
+	case BPF_CGROUP_UDP6_RECVMSG:
+		err = run_xmsg_test_case(test, 0);
+		break;
+	default:
+		goto err;
+	}
+
+	if (test->expected_result == SYSCALL_EPERM && err == EPERM) {
+		err = 0; /* error was expected, reset it */
+		goto out;
+	}
+
+	if (test->expected_result == SYSCALL_ENOTSUPP && err == ENOTSUPP) {
+		err = 0; /* error was expected, reset it */
+		goto out;
+	}
+
+	if (err || test->expected_result != SUCCESS)
+		goto err;
+
+	goto out;
+err:
+	err = -1;
+out:
+	/* Detaching w/o checking return code: best effort attempt. */
+	if (progfd != -1)
+		bpf_prog_detach(cgfd, test->attach_type);
+	close(progfd);
+	printf("[%s]\n", err ? "FAIL" : "PASS");
+	return err;
+}
+
+static int run_tests(int cgfd)
+{
+	int passes = 0;
+	int fails = 0;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(tests); ++i) {
+		if (run_test_case(cgfd, &tests[i]))
+			++fails;
+		else
+			++passes;
+	}
+	printf("Summary: %d PASSED, %d FAILED\n", passes, fails);
+	return fails ? -1 : 0;
+}
+
+int main(int argc, char **argv)
+{
+	int cgfd = -1;
+	int err = 0;
+
+	if (argc < 2) {
+		fprintf(stderr,
+			"%s has to be run via %s.sh. Skip direct run.\n",
+			argv[0], argv[0]);
+		exit(err);
+	}
+
+	cgfd = cgroup_setup_and_join(CG_PATH);
+	if (cgfd < 0)
+		goto err;
+
+	if (run_tests(cgfd))
+		goto err;
+
+	goto out;
+err:
+	err = -1;
+out:
+	close(cgfd);
+	cleanup_cgroup_environment();
+	return err;
+}