[PATCH v2 25/35] selftests/net: Add TCP-AO library
From: Dmitry Safonov
Date: Fri Sep 23 2022 - 16:18:01 EST
Provide functions to create selftests dedicated to TCP-AO.
They can run in parallel, as they use temporary net namespaces.
They can be very specific to the feature being tested.
This will allow to create a lot of TCP-AO tests, without complicating
one binary with many --options and to create scenarios, that are
hard to put in bash script that uses one binary.
Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/net/tcp_ao/.gitignore | 2 +
tools/testing/selftests/net/tcp_ao/Makefile | 45 +++
tools/testing/selftests/net/tcp_ao/connect.c | 81 +++++
.../testing/selftests/net/tcp_ao/lib/aolib.h | 333 +++++++++++++++++
.../selftests/net/tcp_ao/lib/netlink.c | 341 ++++++++++++++++++
tools/testing/selftests/net/tcp_ao/lib/proc.c | 267 ++++++++++++++
.../testing/selftests/net/tcp_ao/lib/setup.c | 297 +++++++++++++++
tools/testing/selftests/net/tcp_ao/lib/sock.c | 294 +++++++++++++++
.../testing/selftests/net/tcp_ao/lib/utils.c | 30 ++
10 files changed, 1691 insertions(+)
create mode 100644 tools/testing/selftests/net/tcp_ao/.gitignore
create mode 100644 tools/testing/selftests/net/tcp_ao/Makefile
create mode 100644 tools/testing/selftests/net/tcp_ao/connect.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/aolib.h
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/netlink.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/proc.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/setup.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/sock.c
create mode 100644 tools/testing/selftests/net/tcp_ao/lib/utils.c
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 1fc89b8ef433..f547db175507 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -48,6 +48,7 @@ TARGETS += net
TARGETS += net/af_unix
TARGETS += net/forwarding
TARGETS += net/mptcp
+TARGETS += net/tcp_ao
TARGETS += netfilter
TARGETS += nsfs
TARGETS += pidfd
diff --git a/tools/testing/selftests/net/tcp_ao/.gitignore b/tools/testing/selftests/net/tcp_ao/.gitignore
new file mode 100644
index 000000000000..e8bb81b715b7
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/.gitignore
@@ -0,0 +1,2 @@
+*_ipv4
+*_ipv6
diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
new file mode 100644
index 000000000000..cb23d67944d7
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/Makefile
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: GPL-2.0
+TEST_BOTH_AF := connect
+
+TEST_IPV4_PROGS := $(TEST_BOTH_AF:%=%_ipv4)
+TEST_IPV6_PROGS := $(TEST_BOTH_AF:%=%_ipv6)
+
+TEST_GEN_PROGS := $(TEST_IPV4_PROGS) $(TEST_IPV6_PROGS)
+
+top_srcdir := ../../../../..
+KSFT_KHDR_INSTALL := 1
+include ../../lib.mk
+
+HOSTAR ?= ar
+
+# Drop it on port to linux/master with commit 8ce72dc32578
+.DEFAULT_GOAL := all
+
+LIBDIR := $(OUTPUT)/lib
+LIB := $(LIBDIR)/libaotst.a
+LDLIBS += $(LIB) -pthread
+LIBDEPS := lib/aolib.h Makefile
+
+CFLAGS := -Wall -O2 -g -D_GNU_SOURCE -fno-strict-aliasing
+CFLAGS += -I ../../../../../usr/include/ -iquote $(LIBDIR)
+CFLAGS += -I ../../../../include/
+
+# Library
+LIBSRC := setup.c netlink.c utils.c sock.c proc.c
+LIBOBJ := $(LIBSRC:%.c=$(LIBDIR)/%.o)
+EXTRA_CLEAN += $(LIBOBJ) $(LIB)
+
+$(LIB): $(LIBOBJ)
+ $(HOSTAR) rcs $@ $^
+
+$(LIBDIR)/%.o: ./lib/%.c $(LIBDEPS)
+ $(CC) $< $(CFLAGS) $(CPPFLAGS) -o $@ -c
+
+$(TEST_GEN_PROGS): $(LIB)
+
+$(OUTPUT)/%_ipv4: %.c
+ $(LINK.c) $^ $(LDLIBS) -o $@
+
+$(OUTPUT)/%_ipv6: %.c
+ $(LINK.c) -DIPV6_TEST $^ $(LDLIBS) -o $@
+
diff --git a/tools/testing/selftests/net/tcp_ao/connect.c b/tools/testing/selftests/net/tcp_ao/connect.c
new file mode 100644
index 000000000000..02aa50f0266c
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/connect.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Author: Dmitry Safonov <dima@xxxxxxxxxx> */
+#include <inttypes.h>
+#include "aolib.h"
+
+static void *server_fn(void *arg)
+{
+ int err, sk, lsk;
+ ssize_t bytes;
+
+ lsk = test_listen_socket(this_ip_addr, test_server_port, 1);
+
+ if (test_set_ao(lsk, "password", 0, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+ synchronize_threads();
+
+ err = test_wait_fd(lsk, TEST_TIMEOUT_SEC, 0);
+ if (!err)
+ test_error("timeouted for accept()");
+ else if (err < 0)
+ test_error("test_wait_fd()");
+
+ sk = accept(lsk, NULL, NULL);
+ if (sk < 0)
+ test_error("accept()");
+
+ synchronize_threads();
+
+ bytes = test_server_run(sk, 0, 0);
+
+ test_fail("server served: %zd", bytes);
+ return NULL;
+}
+
+static void *client_fn(void *arg)
+{
+ int sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ uint64_t before_aogood, after_aogood;
+ const size_t nr_packets = 20;
+ struct netstat *ns_before, *ns_after;
+
+ if (sk < 0)
+ test_error("socket()");
+
+ if (test_set_ao(sk, "password", 0, this_ip_dest, -1, 100, 100))
+ test_error("setsockopt(TCP_AO)");
+
+ synchronize_threads();
+ if (test_connect_socket(sk, this_ip_dest, test_server_port) <= 0)
+ test_error("failed to connect()");
+ synchronize_threads();
+
+ ns_before = netstat_read();
+ before_aogood = netstat_get(ns_before, "TCPAOGood", NULL);
+ if (test_client_verify(sk, 100, nr_packets, TEST_TIMEOUT_SEC)) {
+ test_fail("verify failed");
+ return NULL;
+ }
+
+ ns_after = netstat_read();
+ after_aogood = netstat_get(ns_after, "TCPAOGood", NULL);
+ netstat_print_diff(ns_before, ns_after);
+ netstat_free(ns_before);
+ netstat_free(ns_after);
+
+ if (nr_packets > (after_aogood - before_aogood)) {
+ test_fail("TCPAOGood counter mismatch: %zu > (%zu - %zu)",
+ nr_packets, after_aogood, before_aogood);
+ return NULL;
+ }
+
+ test_ok("connect TCPAOGood %" PRIu64 " => %" PRIu64 ", sent %" PRIu64,
+ before_aogood, after_aogood, nr_packets);
+ return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+ test_init(1, server_fn, client_fn);
+ return 0;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/aolib.h b/tools/testing/selftests/net/tcp_ao/lib/aolib.h
new file mode 100644
index 000000000000..d5810fd04816
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/aolib.h
@@ -0,0 +1,333 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * TCP-AO selftest library. Provides helpers to unshare network
+ * namespaces, create veth, assign ip addresses, set routes,
+ * manipulate socket options, read network counter and etc.
+ * Author: Dmitry Safonov <dima@xxxxxxxxxx>
+ */
+#ifndef _AOLIB_H_
+#define _AOLIB_H_
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <linux/snmp.h>
+#include <linux/tcp.h>
+#include <netinet/in.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include "../../../../../include/linux/stringify.h"
+
+/* Working around ksft, see the comment in lib/setup.c */
+extern void __test_msg(const char *buf);
+extern void __test_ok(const char *buf);
+extern void __test_fail(const char *buf);
+extern void __test_error(const char *buf);
+
+__attribute__((__format__(__printf__, 2, 3)))
+static inline void __test_print(void (*fn)(const char *), const char *fmt, ...)
+{
+#define TEST_MSG_BUFFER_SIZE 4096
+ char buf[TEST_MSG_BUFFER_SIZE];
+ va_list arg;
+
+ va_start(arg, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, arg);
+ va_end(arg);
+ fn(buf);
+}
+
+#define test_print(fmt, ...) \
+ __test_print(__test_msg, "%ld[%s:%u] " fmt "\n", \
+ syscall(SYS_gettid), \
+ __FILE__, __LINE__, ##__VA_ARGS__)
+
+#define test_ok(fmt, ...) \
+ __test_print(__test_ok, fmt "\n", ##__VA_ARGS__)
+
+#define test_fail(fmt, ...) \
+do { \
+ if (errno) \
+ __test_print(__test_fail, fmt ": %m\n", ##__VA_ARGS__); \
+ else \
+ __test_print(__test_fail, fmt "\n", ##__VA_ARGS__); \
+ test_failed(); \
+} while(0)
+
+#define KSFT_FAIL 1
+#define test_error(fmt, ...) \
+do { \
+ if (errno) \
+ __test_print(__test_error, "%ld[%s:%u] " fmt ": %m\n", \
+ syscall(SYS_gettid), __FILE__, __LINE__, \
+ ##__VA_ARGS__); \
+ else \
+ __test_print(__test_error, "%ld[%s:%u] " fmt "\n", \
+ syscall(SYS_gettid), __FILE__, __LINE__, \
+ ##__VA_ARGS__); \
+ exit(KSFT_FAIL); \
+} while(0)
+
+union tcp_addr {
+ struct in_addr a4;
+ struct in6_addr a6;
+};
+
+typedef void *(*thread_fn)(void*);
+extern void test_failed(void);
+extern void __test_init(unsigned int ntests, int family, unsigned prefix,
+ union tcp_addr addr1, union tcp_addr addr2,
+ thread_fn peer1, thread_fn peer2);
+
+static inline void test_init2(unsigned int ntests,
+ thread_fn peer1, thread_fn peer2,
+ int family, unsigned prefix,
+ const char *addr1, const char *addr2)
+{
+ union tcp_addr taddr1, taddr2;
+
+ if (inet_pton(family, addr1, &taddr1) != 1)
+ test_error("Can't convert ip address %s", addr1);
+ if (inet_pton(family, addr2, &taddr2) != 1)
+ test_error("Can't convert ip address %s", addr2);
+
+ __test_init(ntests, family, prefix, taddr1, taddr2, peer1, peer2);
+}
+extern void test_add_destructor(void (*d)(void));
+extern void test_set_optmem(size_t value);
+
+extern const struct sockaddr_in6 addr_any6;
+extern const struct sockaddr_in addr_any4;
+
+#ifdef IPV6_TEST
+# define __TEST_CLIENT_IP(n) ("2001:db8:" __stringify(n) "::1")
+# define TEST_CLIENT_IP __TEST_CLIENT_IP(1)
+# define TEST_WRONG_IP "2001:db8:253::1"
+# define TEST_SERVER_IP "2001:db8:254::1"
+# define TEST_NETWORK "2001::"
+# define TEST_PREFIX 128
+# define TEST_FAMILY AF_INET6
+# define SOCKADDR_ANY addr_any6
+#else
+# define __TEST_CLIENT_IP(n) ("10.0." __stringify(n) ".1")
+# define TEST_CLIENT_IP __TEST_CLIENT_IP(1)
+# define TEST_WRONG_IP "10.0.253.1"
+# define TEST_SERVER_IP "10.0.254.1"
+# define TEST_NETWORK "10.0.0.0"
+# define TEST_PREFIX 32
+# define TEST_FAMILY AF_INET
+# define SOCKADDR_ANY addr_any4
+#endif
+
+static inline void test_init(unsigned int ntests,
+ thread_fn peer1, thread_fn peer2)
+{
+ test_init2(ntests, peer1, peer2, TEST_FAMILY, TEST_PREFIX,
+ TEST_SERVER_IP, TEST_CLIENT_IP);
+}
+extern void synchronize_threads(void);
+extern void switch_ns(int fd);
+
+extern __thread union tcp_addr this_ip_addr;
+extern __thread union tcp_addr this_ip_dest;
+extern int test_family;
+
+extern void randomize_buffer(void *buf, size_t buflen);
+extern const char veth_name[];
+extern int add_veth(const char *name, int nsfda, int nsfdb);
+extern int ip_addr_add(const char *intf, int family,
+ union tcp_addr addr, uint8_t prefix);
+extern int ip_route_add(const char *intf, int family,
+ union tcp_addr src, union tcp_addr dst);
+extern int link_set_up(const char *intf);
+
+extern const unsigned test_server_port;
+extern int test_wait_fd(int sk, time_t sec, bool write);
+extern int __test_connect_socket(int sk, void *addr, size_t addr_sz,
+ time_t timeout);
+extern int __test_listen_socket(int backlog, void *addr, size_t addr_sz);
+
+static inline int test_listen_socket(const union tcp_addr taddr, unsigned port,
+ int backlog)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = htons(port),
+ .sin6_addr = taddr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = htons(port),
+ .sin_addr = taddr.a4,
+ };
+#endif
+ return __test_listen_socket(backlog, (void *)&addr, sizeof(addr));
+}
+
+#ifndef DEFAULT_TEST_ALGO
+#define DEFAULT_TEST_ALGO "cmac(aes128)"
+#endif
+
+#ifdef IPV6_TEST
+#define DEFAULT_TEST_PREFIX 128
+#else
+#define DEFAULT_TEST_PREFIX 32
+#endif
+
+/*
+ * Timeout on syscalls where failure is not expected.
+ * You may want to rise it if the test machine is very busy.
+ */
+#ifndef TEST_TIMEOUT_SEC
+#define TEST_TIMEOUT_SEC 5
+#endif
+
+/*
+ * Timeout on connect() where a failure is expected.
+ * If set to 0 - kernel will try to retransmit SYN number of times, set in
+ * /proc/sys/net/ipv4/tcp_syn_retries
+ * By default set to 1 to make tests pass faster on non-busy machine.
+ */
+#ifndef TEST_RETRANSMIT_SEC
+#define TEST_RETRANSMIT_SEC 1
+#endif
+
+
+static inline int _test_connect_socket(int sk, const union tcp_addr taddr,
+ unsigned port, time_t timeout)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = htons(port),
+ .sin6_addr = taddr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = htons(port),
+ .sin_addr = taddr.a4,
+ };
+#endif
+ return __test_connect_socket(sk, (void *)&addr, sizeof(addr), timeout);
+}
+
+static inline int test_connect_socket(int sk,
+ const union tcp_addr taddr, unsigned port)
+{
+ return _test_connect_socket(sk, taddr, port, TEST_TIMEOUT_SEC);
+}
+
+extern int test_prepare_ao_sockaddr(struct tcp_ao *ao,
+ const char *alg, uint16_t flags,
+ void *addr, size_t addr_sz, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, uint8_t maclen,
+ uint8_t keyflags, uint8_t keylen, const char *key);
+
+static inline int test_prepare_ao(struct tcp_ao *ao,
+ const char *alg, uint16_t flags,
+ union tcp_addr in_addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, uint8_t maclen,
+ uint8_t keyflags, uint8_t keylen, const char *key)
+{
+#ifdef IPV6_TEST
+ struct sockaddr_in6 addr = {
+ .sin6_family = AF_INET6,
+ .sin6_port = 0,
+ .sin6_addr = in_addr.a6,
+ };
+#else
+ struct sockaddr_in addr = {
+ .sin_family = AF_INET,
+ .sin_port = 0,
+ .sin_addr = in_addr.a4,
+ };
+#endif
+
+ return test_prepare_ao_sockaddr(ao, alg, flags,
+ (void *)&addr, sizeof(addr), prefix, sndid, rcvid,
+ maclen, keyflags, keylen, key);
+}
+
+static inline int test_prepare_def_ao(struct tcp_ao *ao,
+ const char *key, uint16_t flags,
+ union tcp_addr in_addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid)
+{
+ if (prefix > DEFAULT_TEST_PREFIX)
+ prefix = DEFAULT_TEST_PREFIX;
+
+ return test_prepare_ao(ao, DEFAULT_TEST_ALGO, flags, in_addr,
+ prefix, sndid, rcvid, 0, 0, strlen(key), key);
+}
+
+extern int test_get_one_ao(int sk, struct tcp_ao_getsockopt *out,
+ uint16_t flags, void *addr, size_t addr_sz,
+ uint8_t prefix, uint8_t sndid, uint8_t rcvid);
+extern int test_cmp_getsockopt_setsockopt(const struct tcp_ao *a,
+ const struct tcp_ao_getsockopt *b);
+
+static inline int test_verify_socket_ao(int sk, struct tcp_ao *ao)
+{
+ struct tcp_ao_getsockopt tmp;
+ int err;
+
+ err = test_get_one_ao(sk, &tmp, 0, &ao->tcpa_addr,
+ sizeof(ao->tcpa_addr), ao->tcpa_prefix,
+ ao->tcpa_sndid, ao->tcpa_rcvid);
+ if (err)
+ return err;
+
+ return test_cmp_getsockopt_setsockopt(ao, &tmp);
+}
+
+static inline int test_set_ao(int sk, const char *key, uint16_t flags,
+ union tcp_addr in_addr, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid)
+{
+ struct tcp_ao tmp;
+ int err;
+
+ err = test_prepare_def_ao(&tmp, key, flags, in_addr,
+ prefix, sndid, rcvid);
+ if (err)
+ return err;
+
+ if (setsockopt(sk, IPPROTO_TCP, TCP_AO, &tmp, sizeof(tmp)) < 0)
+ return -errno;
+
+ return test_verify_socket_ao(sk, &tmp);
+}
+
+extern ssize_t test_server_run(int sk, ssize_t quota, time_t timeout_sec);
+extern ssize_t test_client_loop(int sk, char *buf, size_t buf_sz,
+ const size_t msg_len, time_t timeout_sec);
+extern int test_client_verify(int sk, const size_t msg_len, const size_t nr,
+ time_t timeout_sec);
+
+struct netstat;
+extern struct netstat *netstat_read(void);
+extern void netstat_free(struct netstat *ns);
+extern void netstat_print_diff(struct netstat *nsa, struct netstat *nsb);
+extern uint64_t netstat_get(struct netstat *ns,
+ const char *name, bool *not_found);
+
+static inline uint64_t netstat_get_one(const char *name, bool *not_found)
+{
+ struct netstat *ns = netstat_read();
+ uint64_t ret;
+
+ ret = netstat_get(ns, name, not_found);
+
+ netstat_free(ns);
+ return ret;
+}
+
+#endif /* _AOLIB_H_ */
diff --git a/tools/testing/selftests/net/tcp_ao/lib/netlink.c b/tools/testing/selftests/net/tcp_ao/lib/netlink.c
new file mode 100644
index 000000000000..f04757c921d0
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/netlink.c
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Original from tools/testing/selftests/net/ipsec.c */
+#include <linux/netlink.h>
+#include <linux/random.h>
+#include <linux/rtnetlink.h>
+#include <linux/veth.h>
+#include <net/if.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/socket.h>
+
+#include "aolib.h"
+
+#define MAX_PAYLOAD 2048
+
+static int netlink_sock(int *sock, uint32_t *seq_nr, int proto)
+{
+ if (*sock > 0) {
+ seq_nr++;
+ return 0;
+ }
+
+ *sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, proto);
+ if (*sock <= 0) {
+ test_print("socket(AF_NETLINK)");
+ return -1;
+ }
+
+ randomize_buffer(seq_nr, sizeof(*seq_nr));
+
+ return 0;
+}
+
+static int netlink_check_answer(int sock, bool quite)
+{
+ struct nlmsgerror {
+ struct nlmsghdr hdr;
+ int error;
+ struct nlmsghdr orig_msg;
+ } answer;
+
+ if (recv(sock, &answer, sizeof(answer), 0) < 0) {
+ test_print("recv()");
+ return -1;
+ } else if (answer.hdr.nlmsg_type != NLMSG_ERROR) {
+ test_print("expected NLMSG_ERROR, got %d",
+ (int)answer.hdr.nlmsg_type);
+ return -1;
+ } else if (answer.error) {
+ if (!quite) {
+ test_print("NLMSG_ERROR: %d: %s",
+ answer.error, strerror(-answer.error));
+ }
+ return answer.error;
+ }
+
+ return 0;
+}
+
+static inline struct rtattr *rtattr_hdr(struct nlmsghdr *nh)
+{
+ return (struct rtattr *)((char *)(nh) + RTA_ALIGN((nh)->nlmsg_len));
+}
+
+static int rtattr_pack(struct nlmsghdr *nh, size_t req_sz,
+ unsigned short rta_type, const void *payload, size_t size)
+{
+ /* NLMSG_ALIGNTO == RTA_ALIGNTO, nlmsg_len already aligned */
+ struct rtattr *attr = rtattr_hdr(nh);
+ size_t nl_size = RTA_ALIGN(nh->nlmsg_len) + RTA_LENGTH(size);
+
+ if (req_sz < nl_size) {
+ test_print("req buf is too small: %zu < %zu", req_sz, nl_size);
+ return -1;
+ }
+ nh->nlmsg_len = nl_size;
+
+ attr->rta_len = RTA_LENGTH(size);
+ attr->rta_type = rta_type;
+ memcpy(RTA_DATA(attr), payload, size);
+
+ return 0;
+}
+
+static struct rtattr *_rtattr_begin(struct nlmsghdr *nh, size_t req_sz,
+ unsigned short rta_type, const void *payload, size_t size)
+{
+ struct rtattr *ret = rtattr_hdr(nh);
+
+ if (rtattr_pack(nh, req_sz, rta_type, payload, size))
+ return 0;
+
+ return ret;
+}
+
+static inline struct rtattr *rtattr_begin(struct nlmsghdr *nh, size_t req_sz,
+ unsigned short rta_type)
+{
+ return _rtattr_begin(nh, req_sz, rta_type, 0, 0);
+}
+
+static inline void rtattr_end(struct nlmsghdr *nh, struct rtattr *attr)
+{
+ char *nlmsg_end = (char *)nh + nh->nlmsg_len;
+
+ attr->rta_len = nlmsg_end - (char *)attr;
+}
+
+static int veth_pack_peerb(struct nlmsghdr *nh, size_t req_sz,
+ const char *peer, int ns)
+{
+ struct ifinfomsg pi;
+ struct rtattr *peer_attr;
+
+ memset(&pi, 0, sizeof(pi));
+ pi.ifi_family = AF_UNSPEC;
+ pi.ifi_change = 0xFFFFFFFF;
+
+ peer_attr = _rtattr_begin(nh, req_sz, VETH_INFO_PEER, &pi, sizeof(pi));
+ if (!peer_attr)
+ return -1;
+
+ if (rtattr_pack(nh, req_sz, IFLA_IFNAME, peer, strlen(peer)))
+ return -1;
+
+ if (rtattr_pack(nh, req_sz, IFLA_NET_NS_FD, &ns, sizeof(ns)))
+ return -1;
+
+ rtattr_end(nh, peer_attr);
+
+ return 0;
+}
+
+static int __add_veth(int sock, uint32_t seq, const char *name,
+ int ns_a, int ns_b)
+{
+ uint16_t flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
+ struct {
+ struct nlmsghdr nh;
+ struct ifinfomsg info;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+ const char veth_type[] = "veth";
+ struct rtattr *link_info, *info_data;
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+ req.nh.nlmsg_type = RTM_NEWLINK;
+ req.nh.nlmsg_flags = flags;
+ req.nh.nlmsg_seq = seq;
+ req.info.ifi_family = AF_UNSPEC;
+ req.info.ifi_change = 0xFFFFFFFF;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFLA_IFNAME, name, strlen(name)))
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFLA_NET_NS_FD, &ns_a, sizeof(ns_a)))
+ return -1;
+
+ link_info = rtattr_begin(&req.nh, sizeof(req), IFLA_LINKINFO);
+ if (!link_info)
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFLA_INFO_KIND, veth_type, sizeof(veth_type)))
+ return -1;
+
+ info_data = rtattr_begin(&req.nh, sizeof(req), IFLA_INFO_DATA);
+ if (!info_data)
+ return -1;
+
+ if (veth_pack_peerb(&req.nh, sizeof(req), name, ns_b))
+ return -1;
+
+ rtattr_end(&req.nh, info_data);
+ rtattr_end(&req.nh, link_info);
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+ return netlink_check_answer(sock, false);
+}
+
+int add_veth(const char *name, int nsfda, int nsfdb)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __add_veth(route_sock, route_seq++, name, nsfda, nsfdb);
+ close(route_sock);
+ return ret;
+}
+
+static int __ip_addr_add(int sock, uint32_t seq, const char *intf,
+ int family, union tcp_addr addr, uint8_t prefix)
+{
+ uint16_t flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
+ struct {
+ struct nlmsghdr nh;
+ struct ifaddrmsg info;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+ size_t addr_len = (family == AF_INET) ? sizeof(struct in_addr) :
+ sizeof(struct in6_addr);
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+ req.nh.nlmsg_type = RTM_NEWADDR;
+ req.nh.nlmsg_flags = flags;
+ req.nh.nlmsg_seq = seq;
+ req.info.ifa_family = family;
+ req.info.ifa_prefixlen = prefix;
+ req.info.ifa_index = if_nametoindex(intf);
+ req.info.ifa_flags = IFA_F_NODAD;
+
+ if (rtattr_pack(&req.nh, sizeof(req), IFA_LOCAL, &addr, addr_len))
+ return -1;
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+ return netlink_check_answer(sock, true);
+}
+
+int ip_addr_add(const char *intf, int family,
+ union tcp_addr addr, uint8_t prefix)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __ip_addr_add(route_sock, route_seq++, intf,
+ family, addr, prefix);
+
+ close(route_sock);
+ return ret;
+}
+
+static int __ip_route_add(int sock, uint32_t seq, const char *intf, int family,
+ union tcp_addr src, union tcp_addr dst)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct rtmsg rt;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+ unsigned int index = if_nametoindex(intf);
+ size_t addr_len = (family == AF_INET) ? sizeof(struct in_addr) :
+ sizeof(struct in6_addr);
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
+ req.nh.nlmsg_type = RTM_NEWROUTE;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_CREATE;
+ req.nh.nlmsg_seq = seq;
+ req.rt.rtm_family = family;
+ req.rt.rtm_dst_len = (family == AF_INET) ? 32 : 128;
+ req.rt.rtm_table = RT_TABLE_MAIN;
+ req.rt.rtm_protocol = RTPROT_BOOT;
+ req.rt.rtm_scope = RT_SCOPE_UNIVERSE;
+ req.rt.rtm_type = RTN_UNICAST;
+
+ if (rtattr_pack(&req.nh, sizeof(req), RTA_DST, &dst, addr_len))
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), RTA_PREFSRC, &src, addr_len))
+ return -1;
+
+ if (rtattr_pack(&req.nh, sizeof(req), RTA_OIF, &index, sizeof(index)))
+ return -1;
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+
+ return netlink_check_answer(sock, true);
+}
+
+int ip_route_add(const char *intf, int family,
+ union tcp_addr src, union tcp_addr dst)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __ip_route_add(route_sock, route_seq++, intf, family, src, dst);
+ if (ret == -EEXIST) /* ignoring */
+ ret = 0;
+
+ close(route_sock);
+ return ret;
+}
+
+static int __link_set_up(int sock, uint32_t seq, const char *intf)
+{
+ struct {
+ struct nlmsghdr nh;
+ struct ifinfomsg info;
+ char attrbuf[MAX_PAYLOAD];
+ } req;
+
+ memset(&req, 0, sizeof(req));
+ req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+ req.nh.nlmsg_type = RTM_NEWLINK;
+ req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+ req.nh.nlmsg_seq = seq;
+ req.info.ifi_family = AF_UNSPEC;
+ req.info.ifi_change = 0xFFFFFFFF;
+ req.info.ifi_index = if_nametoindex(intf);
+ req.info.ifi_flags = IFF_UP;
+ req.info.ifi_change = IFF_UP;
+
+ if (send(sock, &req, req.nh.nlmsg_len, 0) < 0) {
+ test_print("send()");
+ return -1;
+ }
+ return netlink_check_answer(sock, false);
+}
+
+int link_set_up(const char *intf)
+{
+ int route_sock = -1, ret;
+ uint32_t route_seq;
+
+ if (netlink_sock(&route_sock, &route_seq, NETLINK_ROUTE))
+ test_error("Failed to open netlink route socket\n");
+
+ ret = __link_set_up(route_sock, route_seq++, intf);
+
+ close(route_sock);
+ return ret;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/proc.c b/tools/testing/selftests/net/tcp_ao/lib/proc.c
new file mode 100644
index 000000000000..815bb7b5975a
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/proc.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdio.h>
+#include "../../../../../include/linux/compiler.h"
+#include "../../../../../include/linux/kernel.h"
+#include "aolib.h"
+
+struct netstat_counter {
+ uint64_t val;
+ char *name;
+};
+
+struct netstat {
+ char *header_name;
+ struct netstat *next;
+ size_t counters_nr;
+ struct netstat_counter *counters;
+};
+
+static struct netstat *lookup_type(struct netstat *ns,
+ const char *type, size_t len)
+{
+ while (ns != NULL) {
+ size_t cmp = max(len, strlen(ns->header_name));
+
+ if (!strncmp(ns->header_name, type, cmp))
+ return ns;
+ ns = ns->next;
+ }
+ return NULL;
+}
+
+static struct netstat *lookup_get(struct netstat *ns,
+ const char *type, const size_t len)
+{
+ struct netstat *ret;
+
+ ret = lookup_type(ns, type, len);
+ if (ret != NULL)
+ return ret;
+
+ ret = malloc(sizeof(struct netstat));
+ if (!ret)
+ test_error("malloc()");
+
+ ret->header_name = strndup(type, len);
+ if (ret->header_name == NULL)
+ test_error("strndup()");
+ ret->next = ns;
+ ret->counters_nr = 0;
+ ret->counters = NULL;
+
+ return ret;
+}
+
+static struct netstat *lookup_get_column(struct netstat *ns, const char *line)
+{
+ char *column;
+
+ column = strchr(line, ':');
+ if (!column)
+ test_error("can't parse netstat file");
+
+ return lookup_get(ns, line, column - line);
+}
+
+static void netstat_read_type(FILE *fnetstat, struct netstat **dest, char *line)
+{
+ struct netstat *type = lookup_get_column(*dest, line);
+ const char *pos = line;
+ size_t i, nr_elems = 0;
+ char tmp;
+
+ while ((pos = strchr(pos, ' '))) {
+ nr_elems++;
+ pos++;
+ }
+
+ *dest = type;
+ type->counters = reallocarray(type->counters,
+ type->counters_nr + nr_elems,
+ sizeof(struct netstat_counter));
+ if (!type->counters)
+ test_error("reallocarray()");
+
+ pos = strchr(line, ' ') + 1;
+
+ if (fscanf(fnetstat, type->header_name) == EOF)
+ test_error("fscanf(%s)", type->header_name);
+ if (fread(&tmp, 1, 1, fnetstat) != 1 || tmp != ':')
+ test_error("Unexpected netstat format (%c)", tmp);
+
+ for (i = type->counters_nr; i < type->counters_nr + nr_elems; i++) {
+ struct netstat_counter *nc = &type->counters[i];
+ const char *new_pos = strchr(pos, ' ');
+ const char *fmt = " %" PRIu64;
+
+ if (new_pos == NULL)
+ new_pos = strchr(pos, '\n');
+
+ nc->name = strndup(pos, new_pos - pos);
+ if (nc->name == NULL)
+ test_error("strndup()");
+
+ if (unlikely(!strcmp(nc->name, "MaxConn")))
+ fmt = " %" PRId64; /* MaxConn is signed, RFC 2012 */
+ if (fscanf(fnetstat, fmt, &nc->val) != 1)
+ test_error("fscanf(%s)", nc->name);
+ pos = new_pos + 1;
+ }
+ type->counters_nr += nr_elems;
+
+ if (fread(&tmp, 1, 1, fnetstat) != 1 || tmp != '\n')
+ test_error("Unexpected netstat format");
+}
+
+static const char *snmp6_name = "Snmp6";
+static void snmp6_read(FILE *fnetstat, struct netstat **dest)
+{
+ struct netstat *type = lookup_get(*dest, snmp6_name, strlen(snmp6_name));
+ char *counter_name;
+ size_t i;
+
+ for (i = type->counters_nr;; i++) {
+ struct netstat_counter *nc;
+ uint64_t counter;
+
+ if (fscanf(fnetstat, "%ms", &counter_name) == EOF)
+ break;
+ if (fscanf(fnetstat, "%" PRIu64, &counter) == EOF)
+ test_error("Unexpected snmp6 format");
+ type->counters = reallocarray(type->counters, i + 1,
+ sizeof(struct netstat_counter));
+ if (!type->counters)
+ test_error("reallocarray()");
+ nc = &type->counters[i];
+ nc->name = counter_name;
+ nc->val = counter;
+ }
+ type->counters_nr = i;
+ *dest = type;
+}
+
+struct netstat *netstat_read(void)
+{
+ struct netstat *ret = 0;
+ size_t line_sz = 0;
+ char *line = NULL;
+ FILE *fnetstat;
+
+ errno = 0;
+ fnetstat = fopen("/proc/net/netstat", "r");
+ if (fnetstat == NULL)
+ test_error("failed to open /proc/net/netstat");
+
+ while (getline(&line, &line_sz, fnetstat) != -1)
+ netstat_read_type(fnetstat, &ret, line);
+ fclose(fnetstat);
+
+ errno = 0;
+ fnetstat = fopen("/proc/net/snmp", "r");
+ if (fnetstat == NULL)
+ test_error("failed to open /proc/net/snmp");
+
+ while (getline(&line, &line_sz, fnetstat) != -1)
+ netstat_read_type(fnetstat, &ret, line);
+ fclose(fnetstat);
+
+ errno = 0;
+ fnetstat = fopen("/proc/net/snmp6", "r");
+ if (fnetstat == NULL)
+ test_error("failed to open /proc/net/snmp6");
+
+ snmp6_read(fnetstat, &ret);
+ fclose(fnetstat);
+
+ free(line);
+ return ret;
+}
+
+void netstat_free(struct netstat *ns)
+{
+ while (ns != NULL) {
+ struct netstat *prev = ns;
+ size_t i;
+
+ free(ns->header_name);
+ for (i = 0; i < ns->counters_nr; i++)
+ free(ns->counters[i].name);
+ free(ns->counters);
+ ns = ns->next;
+ free(prev);
+ }
+}
+
+static void inline
+__netstat_print_diff(uint64_t a, struct netstat *nsb, size_t i)
+{
+ if (unlikely(!strcmp(nsb->header_name, "MaxConn"))) {
+ test_print("%8s %25s: %" PRId64 " => %" PRId64,
+ nsb->header_name, nsb->counters[i].name,
+ a, nsb->counters[i].val);
+ return;
+ }
+
+ test_print("%8s %25s: %" PRIu64 " => %" PRIu64, nsb->header_name,
+ nsb->counters[i].name, a, nsb->counters[i].val);
+}
+
+void netstat_print_diff(struct netstat *nsa, struct netstat *nsb)
+{
+ size_t i, j;
+
+ while (nsb != NULL) {
+ if (unlikely(strcmp(nsb->header_name, nsa->header_name))) {
+ for (i = 0; i < nsb->counters_nr; i++)
+ __netstat_print_diff(0, nsb, i);
+ nsb = nsb->next;
+ continue;
+ }
+
+ if (nsb->counters_nr < nsa->counters_nr)
+ test_error("Unexpected: some counters dissapeared!");
+
+ for (j = 0, i = 0; i < nsb->counters_nr; i++) {
+ if (strcmp(nsb->counters[i].name, nsa->counters[j].name)) {
+ __netstat_print_diff(0, nsb, i);
+ continue;
+ }
+
+ if (nsa->counters[j].val == nsb->counters[i].val) {
+ j++;
+ continue;
+ }
+
+ __netstat_print_diff(nsa->counters[j].val, nsb, i);
+ j++;
+ }
+ if (j != nsa->counters_nr)
+ test_error("Unexpected: some counters dissapeared!");
+
+ nsb = nsb->next;
+ nsa = nsa->next;
+ }
+}
+
+uint64_t netstat_get(struct netstat *ns, const char *name, bool *not_found)
+{
+ if (not_found)
+ *not_found = false;
+
+ while (ns != NULL) {
+ size_t i;
+
+ for (i = 0; i < ns->counters_nr; i++) {
+ if (!strcmp(name, ns->counters[i].name))
+ return ns->counters[i].val;
+ }
+
+ ns = ns->next;
+ }
+
+ if (not_found)
+ *not_found = true;
+ return 0;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/setup.c b/tools/testing/selftests/net/tcp_ao/lib/setup.c
new file mode 100644
index 000000000000..b47672a2a5c0
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/setup.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <signal.h>
+#include "aolib.h"
+
+/*
+ * Can't be included in the header: it defines static variables which
+ * will be unique to every object. Let's include it only once here.
+ */
+#include "../../../kselftest.h"
+
+/* Prevent overriding of one thread's output by another */
+static pthread_mutex_t ksft_print_lock = PTHREAD_MUTEX_INITIALIZER;
+
+void __test_msg(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_print_msg(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+void __test_ok(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_pass(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+void __test_fail(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_fail(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+
+void __test_error(const char *buf)
+{
+ pthread_mutex_lock(&ksft_print_lock);
+ ksft_test_result_error(buf);
+ pthread_mutex_unlock(&ksft_print_lock);
+}
+
+static volatile int failed;
+
+void test_failed(void)
+{
+ failed = 1;
+}
+
+static void test_exit(void)
+{
+ if (failed)
+ ksft_exit_fail();
+ else
+ ksft_exit_pass();
+}
+
+struct dlist_t {
+ void (*destruct)(void);
+ struct dlist_t *next;
+};
+static struct dlist_t *destructors_list;
+
+void test_add_destructor(void (*d)(void))
+{
+ struct dlist_t *p;
+
+ p = malloc(sizeof(struct dlist_t));
+ if (p == NULL)
+ test_error("malloc() failed");
+
+ p->next = destructors_list;
+ p->destruct = d;
+ destructors_list = p;
+}
+
+static void test_destructor(void) __attribute__((destructor));
+static void test_destructor(void)
+{
+ while (destructors_list) {
+ struct dlist_t *p = destructors_list->next;
+
+ destructors_list->destruct();
+ free(destructors_list);
+ destructors_list = p;
+ }
+ test_exit();
+}
+
+static void sig_int(int signo)
+{
+ test_error("Caught SIGINT - exiting");
+}
+
+static int open_netns(void)
+{
+ const char *netns_path = "/proc/self/ns/net";
+ int fd;
+
+ fd = open(netns_path, O_RDONLY);
+ if (fd <= 0)
+ test_error("open(%s)", netns_path);
+ return fd;
+}
+
+static int unshare_open(void)
+{
+ if (unshare(CLONE_NEWNET) != 0)
+ test_error("unshare()");
+
+ return open_netns();
+}
+
+void switch_ns(int fd)
+{
+ if (setns(fd, CLONE_NEWNET))
+ test_error("setns()");
+}
+
+int switch_save_ns(int new_ns)
+{
+ int ret = open_netns();
+
+ switch_ns(new_ns);
+ return ret;
+}
+
+static int nsfd_outside = -1;
+static int nsfd_parent = -1;
+static int nsfd_child = -1;
+const char veth_name[] = "ktst-veth";
+
+static void init_namespaces(void)
+{
+ nsfd_outside = open_netns();
+ nsfd_parent = unshare_open();
+ nsfd_child = unshare_open();
+}
+
+static void link_init(const char *veth, int family, uint8_t prefix,
+ union tcp_addr addr, union tcp_addr dest)
+{
+ if (link_set_up(veth))
+ test_error("Failed to set link up");
+ if (ip_addr_add(veth, family, addr, prefix))
+ test_error("Failed to add ip address");
+ if (ip_route_add(veth, family, addr, dest))
+ test_error("Failed to add route");
+}
+
+static unsigned nr_threads = 1;
+
+static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t sync_cond = PTHREAD_COND_INITIALIZER;
+static volatile unsigned stage_threads[2];
+static volatile unsigned stage_nr;
+
+/* synchronize all threads in the same stage */
+void synchronize_threads(void)
+{
+ unsigned q = stage_nr;
+
+ pthread_mutex_lock(&sync_lock);
+ stage_threads[q]++;
+ if (stage_threads[q] == nr_threads) {
+ stage_nr ^= 1;
+ stage_threads[stage_nr] = 0;
+ pthread_cond_signal(&sync_cond);
+ }
+ while (stage_threads[q] < nr_threads)
+ pthread_cond_wait(&sync_cond, &sync_lock);
+ pthread_mutex_unlock(&sync_lock);
+}
+
+__thread union tcp_addr this_ip_addr;
+__thread union tcp_addr this_ip_dest;
+int test_family;
+
+struct new_pthread_arg {
+ thread_fn func;
+ union tcp_addr my_ip;
+ union tcp_addr dest_ip;
+};
+static void *new_pthread_entry(void *arg)
+{
+ struct new_pthread_arg *p = arg;
+
+ this_ip_addr = p->my_ip;
+ this_ip_dest = p->dest_ip;
+ p->func(NULL); /* shouldn't return */
+ exit(KSFT_FAIL);
+}
+
+void __test_init(unsigned int ntests, int family, unsigned prefix,
+ union tcp_addr addr1, union tcp_addr addr2,
+ thread_fn peer1, thread_fn peer2)
+{
+ struct sigaction sa = {
+ .sa_handler = sig_int,
+ .sa_flags = SA_RESTART,
+ };
+ time_t seed = time(NULL);
+
+ test_family = family;
+ ksft_set_plan(ntests);
+
+ test_print("rand seed %u", (unsigned int)seed);
+ srand(seed);
+
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(SIGINT, &sa, NULL))
+ test_error("Can't set SIGINT handler");
+
+ ksft_print_header();
+ init_namespaces();
+
+ if (add_veth(veth_name, nsfd_parent, nsfd_child))
+ test_error("Failed to add veth");
+
+ switch_ns(nsfd_child);
+ link_init(veth_name, family, prefix, addr2, addr1);
+ if (peer2) {
+ struct new_pthread_arg targ;
+ pthread_t t;
+
+ targ.my_ip = addr2;
+ targ.dest_ip = addr1;
+ targ.func = peer2;
+ nr_threads++;
+ if (pthread_create(&t, NULL, new_pthread_entry, &targ))
+ test_error("Failed to create pthread");
+ }
+ switch_ns(nsfd_parent);
+ link_init(veth_name, family, prefix, addr1, addr2);
+
+ this_ip_addr = addr1;
+ this_ip_dest = addr2;
+ peer1(NULL);
+ if (failed)
+ exit(KSFT_FAIL);
+ else
+ exit(KSFT_PASS);
+}
+
+/* /proc/sys/net/core/optmem_max artifically limits the amount of memory
+ * that can be allocated with sock_kmalloc() on each socket in the system.
+ * It is not virtualized, so it has to written outside test namespaces.
+ * To be nice a test will revert optmem back to the old value.
+ * Keeping it simple without any file lock, which means the tests that
+ * need to set/increase optmem value shouldn't run in parallel.
+ * Also, not re-entrant.
+ */
+static const char *optmem_file = "/proc/sys/net/core/optmem_max";
+static size_t saved_optmem;
+
+static void __test_set_optmem(size_t new, size_t *old)
+{
+ FILE *foptmem;
+ int old_ns;
+
+ old_ns = switch_save_ns(nsfd_outside);
+ foptmem = fopen(optmem_file, "r+");
+ if (!foptmem)
+ test_error("failed to open %s", optmem_file);
+
+ if (old != NULL) {
+ if (fscanf(foptmem, "%zu", old) != 1)
+ test_error("can't read from %s", optmem_file);
+ fclose(foptmem);
+ foptmem = fopen(optmem_file, "w");
+ if (!foptmem)
+ test_error("failed to open %s", optmem_file);
+ }
+
+ if (fprintf(foptmem, "%zu", new) <= 0)
+ test_error("can't write %zu to %s", new, optmem_file);
+ fclose(foptmem);
+ switch_ns(old_ns);
+}
+
+static void test_revert_optmem(void)
+{
+ if (saved_optmem == 0)
+ return;
+
+ __test_set_optmem(saved_optmem, NULL);
+}
+
+void test_set_optmem(size_t value)
+{
+ if (saved_optmem == 0) {
+ __test_set_optmem(value, &saved_optmem);
+ test_add_destructor(test_revert_optmem);
+ } else {
+ __test_set_optmem(value, NULL);
+ }
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/sock.c b/tools/testing/selftests/net/tcp_ao/lib/sock.c
new file mode 100644
index 000000000000..c0b0ac77b644
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/sock.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <alloca.h>
+#include <fcntl.h>
+#include <string.h>
+#include "../../../../../include/linux/kernel.h"
+#include "../../../../../include/linux/stringify.h"
+#include "aolib.h"
+
+const unsigned test_server_port = 7010;
+int __test_listen_socket(int backlog, void *addr, size_t addr_sz)
+{
+ int err, sk = socket(test_family, SOCK_STREAM, IPPROTO_TCP);
+ long flags;
+
+ if (sk < 0)
+ test_error("socket()");
+
+ err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE, veth_name,
+ strlen(veth_name) + 1);
+ if (err < 0)
+ test_error("setsockopt(SO_BINDTODEVICE)");
+
+ if (bind(sk, (struct sockaddr *)addr, addr_sz) < 0)
+ test_error("bind()");
+
+ flags = fcntl(sk, F_GETFL);
+ if ((flags < 0) || (fcntl(sk, F_SETFL, flags | O_NONBLOCK) < 0))
+ test_error("fcntl()");
+
+ if (listen(sk, backlog))
+ test_error("listen()");
+
+ return sk;
+}
+
+int test_wait_fd(int sk, time_t sec, bool write)
+{
+ struct timeval tv = { .tv_sec = sec };
+ struct timeval *ptv = NULL;
+ fd_set fds, efds;
+ int ret;
+ socklen_t slen = sizeof(ret);
+
+ FD_ZERO(&fds);
+ FD_SET(sk, &fds);
+ FD_ZERO(&efds);
+ FD_SET(sk, &efds);
+
+ if (sec)
+ ptv = &tv;
+
+ errno = 0;
+ if (write)
+ ret = select(sk + 1, NULL, &fds, &efds, ptv);
+ else
+ ret = select(sk + 1, &fds, NULL, &efds, ptv);
+ if (ret <= 0)
+ return -errno;
+
+ if (getsockopt(sk, SOL_SOCKET, SO_ERROR, &ret, &slen) || ret)
+ return -ret;
+ return sk;
+}
+
+int __test_connect_socket(int sk, void *addr, size_t addr_sz, time_t timeout)
+{
+ long flags;
+ int err;
+
+ err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE, veth_name,
+ strlen(veth_name) + 1);
+ if (err < 0)
+ test_error("setsockopt(SO_BINDTODEVICE)");
+
+ if (!timeout) {
+ err = connect(sk, addr, addr_sz);
+ if (err) {
+ err = -errno;
+ goto out;
+ }
+ return 0;
+ }
+
+ flags = fcntl(sk, F_GETFL);
+ if ((flags < 0) || (fcntl(sk, F_SETFL, flags | O_NONBLOCK) < 0))
+ test_error("fcntl()");
+
+ if (connect(sk, addr, addr_sz) < 0) {
+ if (errno != EINPROGRESS) {
+ err = -errno;
+ goto out;
+ }
+ err = test_wait_fd(sk, timeout, 1);
+ if (err <= 0)
+ goto out;
+ }
+ return sk;
+
+out:
+ close(sk);
+ return err;
+}
+
+int test_prepare_ao_sockaddr(struct tcp_ao *ao, const char *alg, uint16_t flags,
+ void *addr, size_t addr_sz, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid, uint8_t maclen,
+ uint8_t keyflags, uint8_t keylen, const char *key)
+{
+ memset(ao, 0, sizeof(struct tcp_ao));
+
+ ao->tcpa_flags = flags;
+ ao->tcpa_prefix = prefix;
+ ao->tcpa_sndid = sndid;
+ ao->tcpa_rcvid = rcvid;
+ ao->tcpa_maclen = maclen;
+ ao->tcpa_keyflags = keyflags;
+ ao->tcpa_keylen = keylen;
+
+ memcpy(&ao->tcpa_addr, addr, addr_sz);
+
+ if (strlen(alg) > 64)
+ return -ENOBUFS;
+ strncpy(ao->tcpa_alg_name, alg, 64);
+
+ memcpy(ao->tcpa_key, key,
+ (TCP_AO_MAXKEYLEN < keylen) ? TCP_AO_MAXKEYLEN : keylen);
+ return 0;
+}
+
+int test_get_one_ao(int sk, struct tcp_ao_getsockopt *out, uint16_t flags,
+ void *addr, size_t addr_sz, uint8_t prefix,
+ uint8_t sndid, uint8_t rcvid)
+{
+ struct tcp_ao_getsockopt tmp = {};
+ socklen_t tmp_sz = sizeof(tmp);
+ int ret;
+
+ memcpy(&tmp.addr, addr, addr_sz);
+ tmp.prefix = prefix;
+ tmp.sndid = sndid;
+ tmp.rcvid = rcvid;
+ tmp.flags = flags;
+ tmp.nkeys = 1;
+
+ ret = getsockopt(sk, IPPROTO_TCP, TCP_AO_GET, &tmp, &tmp_sz);
+ if (ret)
+ return ret;
+ if (tmp.nkeys != 1)
+ return -ENOENT;
+ *out = tmp;
+ return 0;
+}
+
+int test_cmp_getsockopt_setsockopt(const struct tcp_ao *a,
+ const struct tcp_ao_getsockopt *b)
+{
+ bool is_kdf_aes_128_cmac = false;
+
+ if (!strcmp("cmac(aes128)", a->tcpa_alg_name))
+ is_kdf_aes_128_cmac = (a->tcpa_keylen != 16);
+
+#define __cmp_ao(member) \
+ if (b->member != a->tcpa_##member) { \
+ test_fail("getsockopt(): " __stringify(member) " %u != %u", \
+ b->member, a->tcpa_##member); \
+ return -1; \
+ }
+ __cmp_ao(sndid);
+ __cmp_ao(rcvid);
+ __cmp_ao(prefix);
+ __cmp_ao(keyflags);
+ if (a->tcpa_maclen) {
+ __cmp_ao(maclen);
+ } else if (b->maclen != 12) {
+ test_fail("getsockopt(): expected default maclen 12, but it's %u",
+ b->maclen);
+ return -1;
+ }
+ if (!is_kdf_aes_128_cmac) {
+ __cmp_ao(keylen);
+ } else if (b->keylen != 16) {
+ test_fail("getsockopt(): expected keylen 16 for cmac(aes128), but it's %u",
+ b->keylen);
+ return -1;
+ }
+#undef __cmp_ao
+ if (!is_kdf_aes_128_cmac && memcmp(b->key, a->tcpa_key, a->tcpa_keylen)) {
+ test_fail("getsockopt(): returned key is different `%s' != `%s'",
+ b->key, a->tcpa_key);
+ return -1;
+ }
+ if (memcmp(&b->addr, &a->tcpa_addr, sizeof(b->addr))) {
+ test_fail("getsockopt(): returned address is different");
+ return -1;
+ }
+ if (!is_kdf_aes_128_cmac && strcmp(b->alg_name, a->tcpa_alg_name)) {
+ test_fail("getsockopt(): returned algorithm is different");
+ return -1;
+ }
+ if (is_kdf_aes_128_cmac && strcmp(b->alg_name, "cmac(aes)")) {
+ test_fail("getsockopt(): returned algorithm is different");
+ return -1;
+ }
+ return 0;
+}
+
+#define TEST_BUF_SIZE 4096
+ssize_t test_server_run(int sk, ssize_t quota, time_t timeout_sec)
+{
+ ssize_t total = 0;
+
+ do {
+ char buf[TEST_BUF_SIZE];
+ ssize_t bytes, sent;
+ int ret;
+
+ ret = test_wait_fd(sk, timeout_sec, 0);
+ if (ret <= 0)
+ return ret;
+
+ bytes = recv(sk, buf, sizeof(buf), 0);
+
+ if (bytes < 0)
+ test_error("recv(): %zd", bytes);
+ if (bytes == 0)
+ break;
+
+ ret = test_wait_fd(sk, timeout_sec, 1);
+ if (ret <= 0)
+ return ret;
+
+ sent = send(sk, buf, bytes, 0);
+ if (sent == 0)
+ break;
+ if (sent != bytes)
+ test_error("send()");
+ total += bytes;
+ } while (!quota || total < quota);
+
+ return total;
+}
+
+ssize_t test_client_loop(int sk, char *buf, size_t buf_sz,
+ const size_t msg_len, time_t timeout_sec)
+{
+ char msg[msg_len];
+ int nodelay = 1;
+ size_t i;
+
+ if (setsockopt(sk, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(nodelay)))
+ test_error("setsockopt(TCP_NODELAY)");
+
+ for (i = 0; i < buf_sz; i += min(msg_len, buf_sz - i)) {
+ size_t sent, bytes = min(msg_len, buf_sz - i);
+ int ret;
+
+ ret = test_wait_fd(sk, timeout_sec, 1);
+ if (ret <= 0)
+ return ret;
+
+ sent = send(sk, buf + i, bytes, 0);
+ if (sent == 0)
+ break;
+ if (sent != bytes)
+ test_error("send()");
+
+ ret = test_wait_fd(sk, timeout_sec, 0);
+ if (ret <= 0)
+ return ret;
+
+ bytes = recv(sk, msg, sizeof(msg), 0);
+ if (bytes < 0)
+ test_error("recv(): %zd", bytes);
+ if (bytes != sent)
+ test_error("recv(): %zd != %zd", bytes, sent);
+ if (memcmp(buf + i, msg, bytes) != 0) {
+ test_fail("received message differs");
+ return -1;
+ }
+ }
+ return i;
+}
+
+int test_client_verify(int sk, const size_t msg_len, const size_t nr,
+ time_t timeout_sec)
+{
+ size_t buf_sz = msg_len * nr;
+ char *buf = alloca(buf_sz);
+
+ randomize_buffer(buf, buf_sz);
+ if (test_client_loop(sk, buf, buf_sz, msg_len, timeout_sec) != buf_sz)
+ return -1;
+ return 0;
+}
diff --git a/tools/testing/selftests/net/tcp_ao/lib/utils.c b/tools/testing/selftests/net/tcp_ao/lib/utils.c
new file mode 100644
index 000000000000..372daca525f5
--- /dev/null
+++ b/tools/testing/selftests/net/tcp_ao/lib/utils.c
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "aolib.h"
+#include <string.h>
+
+void randomize_buffer(void *buf, size_t buflen)
+{
+ int *p = (int *)buf;
+ size_t words = buflen / sizeof(int);
+ size_t leftover = buflen % sizeof(int);
+
+ if (!buflen)
+ return;
+
+ while (words--)
+ *p++ = rand();
+
+ if (leftover) {
+ int tmp = rand();
+
+ memcpy(buf + buflen - leftover, &tmp, leftover);
+ }
+}
+
+const struct sockaddr_in6 addr_any6 = {
+ .sin6_family = AF_INET6,
+};
+
+const struct sockaddr_in addr_any4 = {
+ .sin_family = AF_INET,
+};
--
2.37.2