[PATCH bpf-next 0/6] use network helpers, part 8

[PATCH bpf-next 0/6] use network helpers, part 8

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch set uses network helpers in sockmap_ktls and sk_lookup, and drop
three local helpers tcp_server(), inetaddr_len() and make_socket() in them.

Geliang Tang (6):
  selftests/bpf: Use start_server in sockmap_ktls
  selftests/bpf: Use connect_to_fd in sockmap_ktls
  selftests/bpf: Use start_server_str in sk_lookup
  selftests/bpf: Drop inetaddr_len in sk_lookup
  selftests/bpf: Use connect_to_fd in sk_lookup
  selftests/bpf: Drop make_socket in sk_lookup

 .../selftests/bpf/prog_tests/sk_lookup.c      | 144 ++++++------------
 .../selftests/bpf/prog_tests/sockmap_ktls.c   |  32 +---
 2 files changed, 53 insertions(+), 123 deletions(-)

-- 
2.43.0

[PATCH bpf-next 1/6] selftests/bpf: Use start_server in sockmap_ktls

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

Include network_helpers.h in prog_tests/sockmap_ktls.c, use public network
helper start_server() instead of the local defined function tcp_server().
This can avoid duplicate code.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../selftests/bpf/prog_tests/sockmap_ktls.c    | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c b/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c
index 2d0796314862..9cc881b38669 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c
@@ -6,25 +6,11 @@
 
 #include <netinet/tcp.h>
 #include "test_progs.h"
+#include "network_helpers.h"
 
 #define MAX_TEST_NAME 80
 #define TCP_ULP 31
 
-static int tcp_server(int family)
-{
-	int err, s;
-
-	s = socket(family, SOCK_STREAM, 0);
-	if (!ASSERT_GE(s, 0, "socket"))
-		return -1;
-
-	err = listen(s, SOMAXCONN);
-	if (!ASSERT_OK(err, "listen"))
-		return -1;
-
-	return s;
-}
-
 static int disconnect(int fd)
 {
 	struct sockaddr unspec = { AF_UNSPEC };
@@ -39,7 +25,7 @@ static void test_sockmap_ktls_disconnect_after_delete(int family, int map)
 	socklen_t len = sizeof(addr);
 	int err, cli, srv, zero = 0;
 
-	srv = tcp_server(family);
+	srv = start_server(family, SOCK_STREAM, NULL, 0, 0);
 	if (srv == -1)
 		return;
 
-- 
2.43.0

Re: [PATCH bpf-next 1/6] selftests/bpf: Use start_server in sockmap_ktls

[Eduard Zingerman]

On Fri, 2024-06-21 at 18:35 +0800, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> Include network_helpers.h in prog_tests/sockmap_ktls.c, use public network
> helper start_server() instead of the local defined function tcp_server().
> This can avoid duplicate code.
> 
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> ---

Technically, this is not a one-for-one replacement, as start_server()
also does bind() and it's listen backlog is 1, not SOMAXCONN.
Looking at the original commit, the difference does not seem to matter.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

[...]

[PATCH bpf-next 2/6] selftests/bpf: Use connect_to_fd in sockmap_ktls

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

Use public network helper connect_to_fd() instead of open-coding it in
prog_tests/sockmap_ktls.c. This can avoid duplicate code.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../selftests/bpf/prog_tests/sockmap_ktls.c        | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c b/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c
index 9cc881b38669..68867028c432 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_ktls.c
@@ -21,26 +21,16 @@ static int disconnect(int fd)
 /* Disconnect (unhash) a kTLS socket after removing it from sockmap. */
 static void test_sockmap_ktls_disconnect_after_delete(int family, int map)
 {
-	struct sockaddr_storage addr = {0};
-	socklen_t len = sizeof(addr);
 	int err, cli, srv, zero = 0;
 
 	srv = start_server(family, SOCK_STREAM, NULL, 0, 0);
 	if (srv == -1)
 		return;
 
-	err = getsockname(srv, (struct sockaddr *)&addr, &len);
-	if (!ASSERT_OK(err, "getsockopt"))
-		goto close_srv;
-
-	cli = socket(family, SOCK_STREAM, 0);
-	if (!ASSERT_GE(cli, 0, "socket"))
+	cli = connect_to_fd(srv, 0);
+	if (!ASSERT_GE(cli, 0, "connect_to_fd"))
 		goto close_srv;
 
-	err = connect(cli, (struct sockaddr *)&addr, len);
-	if (!ASSERT_OK(err, "connect"))
-		goto close_cli;
-
 	err = bpf_map_update_elem(map, &zero, &cli, 0);
 	if (!ASSERT_OK(err, "bpf_map_update_elem"))
 		goto close_cli;
-- 
2.43.0

Re: [PATCH bpf-next 2/6] selftests/bpf: Use connect_to_fd in sockmap_ktls

[Eduard Zingerman]

On Fri, 2024-06-21 at 18:35 +0800, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> Use public network helper connect_to_fd() instead of open-coding it in
> prog_tests/sockmap_ktls.c. This can avoid duplicate code.
> 
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> ---

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

[...]

[PATCH bpf-next 3/6] selftests/bpf: Use start_server_str in sk_lookup

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch uses public helper start_server_addr() in make_server() in
prog_tests/sk_lookup.c to avoid duplicate code.

Add a helper setsockopts() to set SOL_CUSTOM sockopt looply, set
it to setsockopt pointer of struct network_helper_opts, and pass it to
start_server_addr().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../selftests/bpf/prog_tests/sk_lookup.c      | 57 +++++++++++--------
 1 file changed, 33 insertions(+), 24 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index 597d0467a926..ba73b56f4484 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -77,6 +77,12 @@ struct test {
 	bool reuseport_has_conns; /* Add a connected socket to reuseport group */
 };
 
+struct cb_opts {
+	int family;
+	int sotype;
+	bool reuseport;
+};
+
 static __u32 duration;		/* for CHECK macro */
 
 static bool is_ipv6(const char *ip)
@@ -142,19 +148,14 @@ static int make_socket(int sotype, const char *ip, int port,
 	return fd;
 }
 
-static int make_server(int sotype, const char *ip, int port,
-		       struct bpf_program *reuseport_prog)
+static int setsockopts(int fd, void *opts)
 {
-	struct sockaddr_storage addr = {0};
+	struct cb_opts *co = (struct cb_opts *)opts;
 	const int one = 1;
-	int err, fd = -1;
-
-	fd = make_socket(sotype, ip, port, &addr);
-	if (fd < 0)
-		return -1;
+	int err = 0;
 
 	/* Enabled for UDPv6 sockets for IPv4-mapped IPv6 to work. */
-	if (sotype == SOCK_DGRAM) {
+	if (co->sotype == SOCK_DGRAM) {
 		err = setsockopt(fd, SOL_IP, IP_RECVORIGDSTADDR, &one,
 				 sizeof(one));
 		if (CHECK(err, "setsockopt(IP_RECVORIGDSTADDR)", "failed\n")) {
@@ -163,7 +164,7 @@ static int make_server(int sotype, const char *ip, int port,
 		}
 	}
 
-	if (sotype == SOCK_DGRAM && addr.ss_family == AF_INET6) {
+	if (co->sotype == SOCK_DGRAM && co->family == AF_INET6) {
 		err = setsockopt(fd, SOL_IPV6, IPV6_RECVORIGDSTADDR, &one,
 				 sizeof(one));
 		if (CHECK(err, "setsockopt(IPV6_RECVORIGDSTADDR)", "failed\n")) {
@@ -172,7 +173,7 @@ static int make_server(int sotype, const char *ip, int port,
 		}
 	}
 
-	if (sotype == SOCK_STREAM) {
+	if (co->sotype == SOCK_STREAM) {
 		err = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one,
 				 sizeof(one));
 		if (CHECK(err, "setsockopt(SO_REUSEADDR)", "failed\n")) {
@@ -181,7 +182,7 @@ static int make_server(int sotype, const char *ip, int port,
 		}
 	}
 
-	if (reuseport_prog) {
+	if (co->reuseport) {
 		err = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one,
 				 sizeof(one));
 		if (CHECK(err, "setsockopt(SO_REUSEPORT)", "failed\n")) {
@@ -190,19 +191,27 @@ static int make_server(int sotype, const char *ip, int port,
 		}
 	}
 
-	err = bind(fd, (void *)&addr, inetaddr_len(&addr));
-	if (CHECK(err, "bind", "failed\n")) {
-		log_err("failed to bind listen socket");
-		goto fail;
-	}
+fail:
+	return err;
+}
 
-	if (sotype == SOCK_STREAM) {
-		err = listen(fd, SOMAXCONN);
-		if (CHECK(err, "make_server", "listen")) {
-			log_err("failed to listen on port %d", port);
-			goto fail;
-		}
-	}
+static int make_server(int sotype, const char *ip, int port,
+		       struct bpf_program *reuseport_prog)
+{
+	struct cb_opts cb_opts = {
+		.family = is_ipv6(ip) ? AF_INET6 : AF_INET,
+		.sotype = sotype,
+		.reuseport = reuseport_prog,
+	};
+	struct network_helper_opts opts = {
+		.post_socket_cb = setsockopts,
+		.cb_opts	= &cb_opts,
+	};
+	int err, fd = -1;
+
+	fd = start_server_str(cb_opts.family, sotype, ip, port, &opts);
+	if (CHECK(fd < 0, "start_server_addr", "failed\n"))
+		return -1;
 
 	/* Late attach reuseport prog so we can have one init path */
 	if (reuseport_prog) {
-- 
2.43.0

Re: [PATCH bpf-next 3/6] selftests/bpf: Use start_server_str in sk_lookup

[Eduard Zingerman]

On Fri, 2024-06-21 at 18:35 +0800, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> This patch uses public helper start_server_addr() in make_server() in
> prog_tests/sk_lookup.c to avoid duplicate code.
> 
> Add a helper setsockopts() to set SOL_CUSTOM sockopt looply, set
> it to setsockopt pointer of struct network_helper_opts, and pass it to
> start_server_addr().
> 
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> ---

Acked-by: Eduard Zingerman <eddyz87@gmail.com>

[...]

[PATCH bpf-next 4/6] selftests/bpf: Drop inetaddr_len in sk_lookup

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch adds a new parameter "len" for make_socket() to get the length
of the address by make_sockaddr(), then local helper inetaddr_len() can be
dropped.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../selftests/bpf/prog_tests/sk_lookup.c      | 30 +++++++++----------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index ba73b56f4484..2fc2b928e168 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -108,20 +108,14 @@ static int attach_reuseport(int sock_fd, struct bpf_program *reuseport_prog)
 	return 0;
 }
 
-static socklen_t inetaddr_len(const struct sockaddr_storage *addr)
-{
-	return (addr->ss_family == AF_INET ? sizeof(struct sockaddr_in) :
-		addr->ss_family == AF_INET6 ? sizeof(struct sockaddr_in6) : 0);
-}
-
 static int make_socket(int sotype, const char *ip, int port,
-		       struct sockaddr_storage *addr)
+		       struct sockaddr_storage *addr, socklen_t *len)
 {
 	struct timeval timeo = { .tv_sec = IO_TIMEOUT_SEC };
 	int err, family, fd;
 
 	family = is_ipv6(ip) ? AF_INET6 : AF_INET;
-	err = make_sockaddr(family, ip, port, addr, NULL);
+	err = make_sockaddr(family, ip, port, addr, len);
 	if (CHECK(err, "make_address", "failed\n"))
 		return -1;
 
@@ -231,13 +225,14 @@ static int make_server(int sotype, const char *ip, int port,
 static int make_client(int sotype, const char *ip, int port)
 {
 	struct sockaddr_storage addr = {0};
+	socklen_t len;
 	int err, fd;
 
-	fd = make_socket(sotype, ip, port, &addr);
+	fd = make_socket(sotype, ip, port, &addr, &len);
 	if (fd < 0)
 		return -1;
 
-	err = connect(fd, (void *)&addr, inetaddr_len(&addr));
+	err = connect(fd, (void *)&addr, len);
 	if (CHECK(err, "make_client", "connect")) {
 		log_err("failed to connect client socket");
 		goto fail;
@@ -876,6 +871,7 @@ static void drop_on_lookup(const struct test *t)
 	struct sockaddr_storage dst = {};
 	int client_fd, server_fd, err;
 	struct bpf_link *lookup_link;
+	socklen_t len;
 	ssize_t n;
 
 	lookup_link = attach_lookup_prog(t->lookup_prog);
@@ -888,11 +884,11 @@ static void drop_on_lookup(const struct test *t)
 		goto detach;
 
 	client_fd = make_socket(t->sotype, t->connect_to.ip,
-				t->connect_to.port, &dst);
+				t->connect_to.port, &dst, &len);
 	if (client_fd < 0)
 		goto close_srv;
 
-	err = connect(client_fd, (void *)&dst, inetaddr_len(&dst));
+	err = connect(client_fd, (void *)&dst, len);
 	if (t->sotype == SOCK_DGRAM) {
 		err = send_byte(client_fd);
 		if (err)
@@ -990,6 +986,7 @@ static void drop_on_reuseport(const struct test *t)
 	struct sockaddr_storage dst = { 0 };
 	int client, server1, server2, err;
 	struct bpf_link *lookup_link;
+	socklen_t len;
 	ssize_t n;
 
 	lookup_link = attach_lookup_prog(t->lookup_prog);
@@ -1012,11 +1009,11 @@ static void drop_on_reuseport(const struct test *t)
 		goto close_srv1;
 
 	client = make_socket(t->sotype, t->connect_to.ip,
-			     t->connect_to.port, &dst);
+			     t->connect_to.port, &dst, &len);
 	if (client < 0)
 		goto close_srv2;
 
-	err = connect(client, (void *)&dst, inetaddr_len(&dst));
+	err = connect(client, (void *)&dst, len);
 	if (t->sotype == SOCK_DGRAM) {
 		err = send_byte(client);
 		if (err)
@@ -1230,6 +1227,7 @@ static void run_multi_prog_lookup(const struct test_multi_prog *t)
 	int map_fd, server_fd, client_fd;
 	struct bpf_link *link1, *link2;
 	int prog_idx, done, err;
+	socklen_t len;
 
 	map_fd = bpf_map__fd(t->run_map);
 
@@ -1259,11 +1257,11 @@ static void run_multi_prog_lookup(const struct test_multi_prog *t)
 	if (err)
 		goto out_close_server;
 
-	client_fd = make_socket(SOCK_STREAM, EXT_IP4, EXT_PORT, &dst);
+	client_fd = make_socket(SOCK_STREAM, EXT_IP4, EXT_PORT, &dst, &len);
 	if (client_fd < 0)
 		goto out_close_server;
 
-	err = connect(client_fd, (void *)&dst, inetaddr_len(&dst));
+	err = connect(client_fd, (void *)&dst, len);
 	if (CHECK(err && !t->expect_errno, "connect",
 		  "unexpected error %d\n", errno))
 		goto out_close_client;
-- 
2.43.0

[PATCH bpf-next 5/6] selftests/bpf: Use connect_to_fd in sk_lookup

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch uses public helper connect_to_fd() exported in network_helpers.h
instead of using make_socket() and connect() in prog_tests/sk_lookup.c.
This can simplify the code.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../selftests/bpf/prog_tests/sk_lookup.c      | 33 +++++--------------
 1 file changed, 9 insertions(+), 24 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index 2fc2b928e168..0f2e8a4c1524 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -868,10 +868,8 @@ static void test_redirect_lookup(struct test_sk_lookup *skel)
 
 static void drop_on_lookup(const struct test *t)
 {
-	struct sockaddr_storage dst = {};
 	int client_fd, server_fd, err;
 	struct bpf_link *lookup_link;
-	socklen_t len;
 	ssize_t n;
 
 	lookup_link = attach_lookup_prog(t->lookup_prog);
@@ -883,12 +881,10 @@ static void drop_on_lookup(const struct test *t)
 	if (server_fd < 0)
 		goto detach;
 
-	client_fd = make_socket(t->sotype, t->connect_to.ip,
-				t->connect_to.port, &dst, &len);
+	client_fd = connect_to_fd(server_fd, 0);
 	if (client_fd < 0)
 		goto close_srv;
 
-	err = connect(client_fd, (void *)&dst, len);
 	if (t->sotype == SOCK_DGRAM) {
 		err = send_byte(client_fd);
 		if (err)
@@ -983,10 +979,8 @@ static void test_drop_on_lookup(struct test_sk_lookup *skel)
 
 static void drop_on_reuseport(const struct test *t)
 {
-	struct sockaddr_storage dst = { 0 };
 	int client, server1, server2, err;
 	struct bpf_link *lookup_link;
-	socklen_t len;
 	ssize_t n;
 
 	lookup_link = attach_lookup_prog(t->lookup_prog);
@@ -1008,12 +1002,10 @@ static void drop_on_reuseport(const struct test *t)
 	if (server2 < 0)
 		goto close_srv1;
 
-	client = make_socket(t->sotype, t->connect_to.ip,
-			     t->connect_to.port, &dst, &len);
+	client = connect_to_fd(server2, 0);
 	if (client < 0)
 		goto close_srv2;
 
-	err = connect(client, (void *)&dst, len);
 	if (t->sotype == SOCK_DGRAM) {
 		err = send_byte(client);
 		if (err)
@@ -1160,7 +1152,7 @@ static void run_sk_assign_connected(struct test_sk_lookup *skel,
 	if (server_fd < 0)
 		return;
 
-	connected_fd = make_client(sotype, EXT_IP4, EXT_PORT);
+	connected_fd = connect_to_fd(server_fd, 0);
 	if (connected_fd < 0)
 		goto out_close_server;
 
@@ -1174,7 +1166,7 @@ static void run_sk_assign_connected(struct test_sk_lookup *skel,
 		goto out_close_connected;
 
 	/* Try to redirect TCP SYN / UDP packet to a connected socket */
-	client_fd = make_client(sotype, EXT_IP4, EXT_PORT);
+	client_fd = connect_to_fd(server_fd, 0);
 	if (client_fd < 0)
 		goto out_unlink_prog;
 	if (sotype == SOCK_DGRAM) {
@@ -1223,11 +1215,9 @@ struct test_multi_prog {
 
 static void run_multi_prog_lookup(const struct test_multi_prog *t)
 {
-	struct sockaddr_storage dst = {};
 	int map_fd, server_fd, client_fd;
 	struct bpf_link *link1, *link2;
 	int prog_idx, done, err;
-	socklen_t len;
 
 	map_fd = bpf_map__fd(t->run_map);
 
@@ -1257,17 +1247,13 @@ static void run_multi_prog_lookup(const struct test_multi_prog *t)
 	if (err)
 		goto out_close_server;
 
-	client_fd = make_socket(SOCK_STREAM, EXT_IP4, EXT_PORT, &dst, &len);
-	if (client_fd < 0)
-		goto out_close_server;
-
-	err = connect(client_fd, (void *)&dst, len);
-	if (CHECK(err && !t->expect_errno, "connect",
+	client_fd = connect_to_fd(server_fd, 0);
+	if (CHECK(client_fd < 0 && !t->expect_errno, "connect",
 		  "unexpected error %d\n", errno))
-		goto out_close_client;
-	if (CHECK(err && t->expect_errno && errno != t->expect_errno,
+		goto out_close_server;
+	if (CHECK(client_fd < 0 && t->expect_errno && errno != t->expect_errno,
 		  "connect", "unexpected error %d\n", errno))
-		goto out_close_client;
+		goto out_close_server;
 
 	done = 0;
 	prog_idx = PROG1;
@@ -1281,7 +1267,6 @@ static void run_multi_prog_lookup(const struct test_multi_prog *t)
 	CHECK(err, "bpf_map_lookup_elem", "failed\n");
 	CHECK(!done, "bpf_map_lookup_elem", "PROG2 !done\n");
 
-out_close_client:
 	close(client_fd);
 out_close_server:
 	close(server_fd);
-- 
2.43.0

Re: [PATCH bpf-next 5/6] selftests/bpf: Use connect_to_fd in sk_lookup

[Eduard Zingerman]

On Fri, 2024-06-21 at 18:35 +0800, Geliang Tang wrote:

[...]

> @@ -883,12 +881,10 @@ static void drop_on_lookup(const struct test *t)
>  	if (server_fd < 0)
>  		goto detach;
>  
> -	client_fd = make_socket(t->sotype, t->connect_to.ip,
> -				t->connect_to.port, &dst, &len);
> +	client_fd = connect_to_fd(server_fd, 0);

Nit: make_socket() used timeout { .tv_sec = IO_TIMEOUT_SEC },
     while here commect_to_fd is called with timeout disabled.
     Same applies to other replacements below.

>  	if (client_fd < 0)
>  		goto close_srv;
>  
> -	err = connect(client_fd, (void *)&dst, len);
>  	if (t->sotype == SOCK_DGRAM) {
>  		err = send_byte(client_fd);
>  		if (err)

[...]

> @@ -1257,17 +1247,13 @@ static void run_multi_prog_lookup(const struct test_multi_prog *t)
>  	if (err)
>  		goto out_close_server;
>  
> -	client_fd = make_socket(SOCK_STREAM, EXT_IP4, EXT_PORT, &dst, &len);
> -	if (client_fd < 0)
> -		goto out_close_server;
> -
> -	err = connect(client_fd, (void *)&dst, len);
> -	if (CHECK(err && !t->expect_errno, "connect",
> +	client_fd = connect_to_fd(server_fd, 0);

I'm not sure this is correct.
The original test uses EXT_IP4, EXT_PORT here,
while t->listen_at could be both { EXT_IP4, EXT_PORT } and { INT_IP4, INT_PORT }.
See test_multi_prog_lookup().

> +	if (CHECK(client_fd < 0 && !t->expect_errno, "connect",
>  		  "unexpected error %d\n", errno))
> -		goto out_close_client;
> -	if (CHECK(err && t->expect_errno && errno != t->expect_errno,
> +		goto out_close_server;
> +	if (CHECK(client_fd < 0 && t->expect_errno && errno != t->expect_errno,
>  		  "connect", "unexpected error %d\n", errno))
> -		goto out_close_client;
> +		goto out_close_server;
>  
>  	done = 0;
>  	prog_idx = PROG1;

[...]

[PATCH bpf-next 6/6] selftests/bpf: Drop make_socket in sk_lookup

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

Use public network helpers make_sockaddr() and connect_to_addr() instead of
using the local defined function make_socket() and connect().

Then make_socket() can be dropped.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 .../selftests/bpf/prog_tests/sk_lookup.c      | 50 +++----------------
 1 file changed, 6 insertions(+), 44 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
index 0f2e8a4c1524..e4c983a00511 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_lookup.c
@@ -47,8 +47,6 @@
 #define INT_IP6		"fd00::2"
 #define INT_PORT	8008
 
-#define IO_TIMEOUT_SEC	3
-
 enum server {
 	SERVER_A = 0,
 	SERVER_B = 1,
@@ -108,40 +106,6 @@ static int attach_reuseport(int sock_fd, struct bpf_program *reuseport_prog)
 	return 0;
 }
 
-static int make_socket(int sotype, const char *ip, int port,
-		       struct sockaddr_storage *addr, socklen_t *len)
-{
-	struct timeval timeo = { .tv_sec = IO_TIMEOUT_SEC };
-	int err, family, fd;
-
-	family = is_ipv6(ip) ? AF_INET6 : AF_INET;
-	err = make_sockaddr(family, ip, port, addr, len);
-	if (CHECK(err, "make_address", "failed\n"))
-		return -1;
-
-	fd = socket(addr->ss_family, sotype, 0);
-	if (CHECK(fd < 0, "socket", "failed\n")) {
-		log_err("failed to make socket");
-		return -1;
-	}
-
-	err = setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));
-	if (CHECK(err, "setsockopt(SO_SNDTIMEO)", "failed\n")) {
-		log_err("failed to set SNDTIMEO");
-		close(fd);
-		return -1;
-	}
-
-	err = setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo));
-	if (CHECK(err, "setsockopt(SO_RCVTIMEO)", "failed\n")) {
-		log_err("failed to set RCVTIMEO");
-		close(fd);
-		return -1;
-	}
-
-	return fd;
-}
-
 static int setsockopts(int fd, void *opts)
 {
 	struct cb_opts *co = (struct cb_opts *)opts;
@@ -224,24 +188,22 @@ static int make_server(int sotype, const char *ip, int port,
 
 static int make_client(int sotype, const char *ip, int port)
 {
+	int family = is_ipv6(ip) ? AF_INET6 : AF_INET;
 	struct sockaddr_storage addr = {0};
 	socklen_t len;
 	int err, fd;
 
-	fd = make_socket(sotype, ip, port, &addr, &len);
-	if (fd < 0)
+	err = make_sockaddr(family, ip, port, &addr, &len);
+	if (err)
 		return -1;
 
-	err = connect(fd, (void *)&addr, len);
-	if (CHECK(err, "make_client", "connect")) {
+	fd = connect_to_addr(sotype, &addr, len, NULL);
+	if (CHECK(fd < 0, "connect_to_addr", "connect")) {
 		log_err("failed to connect client socket");
-		goto fail;
+		return -1;
 	}
 
 	return fd;
-fail:
-	close(fd);
-	return -1;
 }
 
 static __u64 socket_cookie(int fd)
-- 
2.43.0

Re: [PATCH bpf-next 6/6] selftests/bpf: Drop make_socket in sk_lookup

[Eduard Zingerman]

On Fri, 2024-06-21 at 18:35 +0800, Geliang Tang wrote:

[...]

> @@ -224,24 +188,22 @@ static int make_server(int sotype, const char *ip, int port,
>  
>  static int make_client(int sotype, const char *ip, int port)
>  {
> +	int family = is_ipv6(ip) ? AF_INET6 : AF_INET;
>  	struct sockaddr_storage addr = {0};
>  	socklen_t len;
>  	int err, fd;
>  
> -	fd = make_socket(sotype, ip, port, &addr, &len);
> -	if (fd < 0)
> +	err = make_sockaddr(family, ip, port, &addr, &len);
> +	if (err)
>  		return -1;
>  
> -	err = connect(fd, (void *)&addr, len);
> -	if (CHECK(err, "make_client", "connect")) {
> +	fd = connect_to_addr(sotype, &addr, len, NULL);

Nit: same nit about timeout, need to pass options here.

> +	if (CHECK(fd < 0, "connect_to_addr", "connect")) {
>  		log_err("failed to connect client socket");
> -		goto fail;
> +		return -1;
>  	}
>  
>  	return fd;
> -fail:
> -	close(fd);
> -	return -1;
>  }
>  
>  static __u64 socket_cookie(int fd)