bpf: selftest: Adapt sock_fields test to use skel and global variables

skel is used.

Global variables are used to store the result from bpf prog.
addr_map, sock_result_map, and tcp_sock_result_map are gone.
Instead, global variables listen_tp, srv_sa6, cli_tp,, srv_tp,
listen_sk, srv_sk, and cli_sk are added.
Because of that, bpf_addr_array_idx and bpf_result_array_idx are also
no longer needed.

CHECK() macro from test_progs.h is reused and bail as soon as
a CHECK failure.

shutdown() is used to ensure the previous data-ack is received.
The bytes_acked, bytes_received, and the pkt_out_cnt checks are
using "<" to accommodate the final ack may not have been received/sent.
It is enough since it is not the focus of this test.

The sk local storage is all initialized to 0xeB9F now, so the
check_sk_pkt_out_cnt() always checks with the 0xeB9F base.  It is to
keep things simple.

The next patch will reuse helpers from network_helpers.h to simplify
things further.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200925000434.3858204-1-kafai@fb.com

tools/testing/selftests/bpf/prog_tests/sock_fields.c

@@ -14,20 +14,9 @@
 #include <bpf/libbpf.h>
 
 #include "cgroup_helpers.h"
+#include "test_progs.h"
 #include "bpf_rlimit.h"
-
-enum bpf_addr_array_idx {
-	ADDR_SRV_IDX,
-	ADDR_CLI_IDX,
-	__NR_BPF_ADDR_ARRAY_IDX,
-};
-
-enum bpf_result_array_idx {
-	EGRESS_SRV_IDX,
-	EGRESS_CLI_IDX,
-	INGRESS_LISTEN_IDX,
-	__NR_BPF_RESULT_ARRAY_IDX,
-};
+#include "test_sock_fields.skel.h"
 
 enum bpf_linum_array_idx {
 	EGRESS_LINUM_IDX,
@@ -40,34 +29,16 @@ struct bpf_spinlock_cnt {
 	__u32 cnt;
 };
 
-#define CHECK(condition, tag, format...) ({				\
-	int __ret = !!(condition);					\
-	if (__ret) {							\
-		printf("%s(%d):FAIL:%s ", __func__, __LINE__, tag);	\
-		printf(format);						\
-		printf("\n");						\
-		exit(-1);						\
-	}								\
-})
-
 #define TEST_CGROUP "/test-bpf-sock-fields"
 #define DATA "Hello BPF!"
 #define DATA_LEN sizeof(DATA)
 
 static struct sockaddr_in6 srv_sa6, cli_sa6;
 static int sk_pkt_out_cnt10_fd;
+struct test_sock_fields *skel;
 static int sk_pkt_out_cnt_fd;
 static int linum_map_fd;
-static int addr_map_fd;
-static int tp_map_fd;
-static int sk_map_fd;
-
-static __u32 addr_srv_idx = ADDR_SRV_IDX;
-static __u32 addr_cli_idx = ADDR_CLI_IDX;
-
-static __u32 egress_srv_idx = EGRESS_SRV_IDX;
-static __u32 egress_cli_idx = EGRESS_CLI_IDX;
-static __u32 ingress_listen_idx = INGRESS_LISTEN_IDX;
+static __u32 duration;
 
 static __u32 egress_linum_idx = EGRESS_LINUM_IDX;
 static __u32 ingress_linum_idx = INGRESS_LINUM_IDX;
@@ -79,7 +50,7 @@ static void init_loopback6(struct sockaddr_in6 *sa6)
 	sa6->sin6_addr = in6addr_loopback;
 }
 
-static void print_sk(const struct bpf_sock *sk)
+static void print_sk(const struct bpf_sock *sk, const char *prefix)
 {
 	char src_ip4[24], dst_ip4[24];
 	char src_ip6[64], dst_ip6[64];
@@ -89,9 +60,10 @@ static void print_sk(const struct bpf_sock *sk)
 	inet_ntop(AF_INET, &sk->dst_ip4, dst_ip4, sizeof(dst_ip4));
 	inet_ntop(AF_INET6, &sk->dst_ip6, dst_ip6, sizeof(dst_ip6));
 
-	printf("state:%u bound_dev_if:%u family:%u type:%u protocol:%u mark:%u priority:%u "
+	printf("%s: state:%u bound_dev_if:%u family:%u type:%u protocol:%u mark:%u priority:%u "
 	       "src_ip4:%x(%s) src_ip6:%x:%x:%x:%x(%s) src_port:%u "
 	       "dst_ip4:%x(%s) dst_ip6:%x:%x:%x:%x(%s) dst_port:%u\n",
+	       prefix,
 	       sk->state, sk->bound_dev_if, sk->family, sk->type, sk->protocol,
 	       sk->mark, sk->priority,
 	       sk->src_ip4, src_ip4,
@@ -102,14 +74,15 @@ static void print_sk(const struct bpf_sock *sk)
 	       dst_ip6, ntohs(sk->dst_port));
 }
 
-static void print_tp(const struct bpf_tcp_sock *tp)
+static void print_tp(const struct bpf_tcp_sock *tp, const char *prefix)
 {
-	printf("snd_cwnd:%u srtt_us:%u rtt_min:%u snd_ssthresh:%u rcv_nxt:%u "
+	printf("%s: snd_cwnd:%u srtt_us:%u rtt_min:%u snd_ssthresh:%u rcv_nxt:%u "
 	       "snd_nxt:%u snd:una:%u mss_cache:%u ecn_flags:%u "
 	       "rate_delivered:%u rate_interval_us:%u packets_out:%u "
 	       "retrans_out:%u total_retrans:%u segs_in:%u data_segs_in:%u "
 	       "segs_out:%u data_segs_out:%u lost_out:%u sacked_out:%u "
 	       "bytes_received:%llu bytes_acked:%llu\n",
+	       prefix,
 	       tp->snd_cwnd, tp->srtt_us, tp->rtt_min, tp->snd_ssthresh,
 	       tp->rcv_nxt, tp->snd_nxt, tp->snd_una, tp->mss_cache,
 	       tp->ecn_flags, tp->rate_delivered, tp->rate_interval_us,
@@ -129,57 +102,26 @@ static void check_result(void)
 	err = bpf_map_lookup_elem(linum_map_fd, &egress_linum_idx,
 				  &egress_linum);
 	CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)",
-	      "err:%d errno:%d", err, errno);
+	      "err:%d errno:%d\n", err, errno);
 
 	err = bpf_map_lookup_elem(linum_map_fd, &ingress_linum_idx,
 				  &ingress_linum);
 	CHECK(err == -1, "bpf_map_lookup_elem(linum_map_fd)",
-	      "err:%d errno:%d", err, errno);
-
-	err = bpf_map_lookup_elem(sk_map_fd, &egress_srv_idx, &srv_sk);
-	CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &egress_srv_idx)",
-	      "err:%d errno:%d", err, errno);
-	err = bpf_map_lookup_elem(tp_map_fd, &egress_srv_idx, &srv_tp);
-	CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &egress_srv_idx)",
-	      "err:%d errno:%d", err, errno);
-
-	err = bpf_map_lookup_elem(sk_map_fd, &egress_cli_idx, &cli_sk);
-	CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &egress_cli_idx)",
-	      "err:%d errno:%d", err, errno);
-	err = bpf_map_lookup_elem(tp_map_fd, &egress_cli_idx, &cli_tp);
-	CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &egress_cli_idx)",
-	      "err:%d errno:%d", err, errno);
-
-	err = bpf_map_lookup_elem(sk_map_fd, &ingress_listen_idx, &listen_sk);
-	CHECK(err == -1, "bpf_map_lookup_elem(sk_map_fd, &ingress_listen_idx)",
-	      "err:%d errno:%d", err, errno);
-	err = bpf_map_lookup_elem(tp_map_fd, &ingress_listen_idx, &listen_tp);
-	CHECK(err == -1, "bpf_map_lookup_elem(tp_map_fd, &ingress_listen_idx)",
-	      "err:%d errno:%d", err, errno);
-
-	printf("listen_sk: ");
-	print_sk(&listen_sk);
-	printf("\n");
-
-	printf("srv_sk: ");
-	print_sk(&srv_sk);
-	printf("\n");
-
-	printf("cli_sk: ");
-	print_sk(&cli_sk);
-	printf("\n");
-
-	printf("listen_tp: ");
-	print_tp(&listen_tp);
-	printf("\n");
-
-	printf("srv_tp: ");
-	print_tp(&srv_tp);
-	printf("\n");
-
-	printf("cli_tp: ");
-	print_tp(&cli_tp);
-	printf("\n");
+	      "err:%d errno:%d\n", err, errno);
+
+	memcpy(&srv_sk, &skel->bss->srv_sk, sizeof(srv_sk));
+	memcpy(&srv_tp, &skel->bss->srv_tp, sizeof(srv_tp));
+	memcpy(&cli_sk, &skel->bss->cli_sk, sizeof(cli_sk));
+	memcpy(&cli_tp, &skel->bss->cli_tp, sizeof(cli_tp));
+	memcpy(&listen_sk, &skel->bss->listen_sk, sizeof(listen_sk));
+	memcpy(&listen_tp, &skel->bss->listen_tp, sizeof(listen_tp));
+
+	print_sk(&listen_sk, "listen_sk");
+	print_sk(&srv_sk, "srv_sk");
+	print_sk(&cli_sk, "cli_sk");
+	print_tp(&listen_tp, "listen_tp");
+	print_tp(&srv_tp, "srv_tp");
+	print_tp(&cli_tp, "cli_tp");
 
 	CHECK(listen_sk.state != 10 ||
 	      listen_sk.family != AF_INET6 ||
@@ -190,8 +132,8 @@ static void check_result(void)
 	      listen_sk.dst_ip6[2] || listen_sk.dst_ip6[3] ||
 	      listen_sk.src_port != ntohs(srv_sa6.sin6_port) ||
 	      listen_sk.dst_port,
-	      "Unexpected listen_sk",
-	      "Check listen_sk output. ingress_linum:%u",
+	      "listen_sk",
+	      "Unexpected. Check listen_sk output. ingress_linum:%u\n",
 	      ingress_linum);
 
 	CHECK(srv_sk.state == 10 ||
@@ -204,7 +146,7 @@ static void check_result(void)
 		     sizeof(srv_sk.dst_ip6)) ||
 	      srv_sk.src_port != ntohs(srv_sa6.sin6_port) ||
 	      srv_sk.dst_port != cli_sa6.sin6_port,
-	      "Unexpected srv_sk", "Check srv_sk output. egress_linum:%u",
+	      "srv_sk", "Unexpected. Check srv_sk output. egress_linum:%u\n",
 	      egress_linum);
 
 	CHECK(cli_sk.state == 10 ||
@@ -217,30 +159,31 @@ static void check_result(void)
 		     sizeof(cli_sk.dst_ip6)) ||
 	      cli_sk.src_port != ntohs(cli_sa6.sin6_port) ||
 	      cli_sk.dst_port != srv_sa6.sin6_port,
-	      "Unexpected cli_sk", "Check cli_sk output. egress_linum:%u",
+	      "cli_sk", "Unexpected. Check cli_sk output. egress_linum:%u\n",
 	      egress_linum);
 
 	CHECK(listen_tp.data_segs_out ||
 	      listen_tp.data_segs_in ||
 	      listen_tp.total_retrans ||
 	      listen_tp.bytes_acked,
-	      "Unexpected listen_tp", "Check listen_tp output. ingress_linum:%u",
+	      "listen_tp",
+	      "Unexpected. Check listen_tp output. ingress_linum:%u\n",
 	      ingress_linum);
 
 	CHECK(srv_tp.data_segs_out != 2 ||
 	      srv_tp.data_segs_in ||
 	      srv_tp.snd_cwnd != 10 ||
 	      srv_tp.total_retrans ||
-	      srv_tp.bytes_acked != 2 * DATA_LEN,
-	      "Unexpected srv_tp", "Check srv_tp output. egress_linum:%u",
+	      srv_tp.bytes_acked < 2 * DATA_LEN,
+	      "srv_tp", "Unexpected. Check srv_tp output. egress_linum:%u\n",
 	      egress_linum);
 
 	CHECK(cli_tp.data_segs_out ||
 	      cli_tp.data_segs_in != 2 ||
 	      cli_tp.snd_cwnd != 10 ||
 	      cli_tp.total_retrans ||
-	      cli_tp.bytes_received != 2 * DATA_LEN,
-	      "Unexpected cli_tp", "Check cli_tp output. egress_linum:%u",
+	      cli_tp.bytes_received < 2 * DATA_LEN,
+	      "cli_tp", "Unexpected. Check cli_tp output. egress_linum:%u\n",
 	      egress_linum);
 }
 
@@ -257,15 +200,14 @@ static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd)
 					  &pkt_out_cnt10);
 
 	/* The bpf prog only counts for fullsock and
-	 * passive conneciton did not become fullsock until 3WHS
-	 * had been finished.
-	 * The bpf prog only counted two data packet out but we
-	 * specially init accept_fd's pkt_out_cnt by 2 in
-	 * init_sk_storage().  Hence, 4 here.
+	 * passive connection did not become fullsock until 3WHS
+	 * had been finished, so the bpf prog only counted two data
+	 * packet out.
 	 */
-	CHECK(err || pkt_out_cnt.cnt != 4 || pkt_out_cnt10.cnt != 40,
+	CHECK(err || pkt_out_cnt.cnt < 0xeB9F + 2 ||
+	      pkt_out_cnt10.cnt < 0xeB9F + 20,
 	      "bpf_map_lookup_elem(sk_pkt_out_cnt, &accept_fd)",
-	      "err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u",
+	      "err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u\n",
 	      err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt);
 
 	pkt_out_cnt.cnt = ~0;
@@ -280,14 +222,14 @@ static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd)
 	 *
 	 * The bpf_prog initialized it to 0xeB9F.
 	 */
-	CHECK(err || pkt_out_cnt.cnt != 0xeB9F + 4 ||
-	      pkt_out_cnt10.cnt != 0xeB9F + 40,
+	CHECK(err || pkt_out_cnt.cnt < 0xeB9F + 4 ||
+	      pkt_out_cnt10.cnt < 0xeB9F + 40,
 	      "bpf_map_lookup_elem(sk_pkt_out_cnt, &cli_fd)",
-	      "err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u",
+	      "err:%d errno:%d pkt_out_cnt:%u pkt_out_cnt10:%u\n",
 	      err, errno, pkt_out_cnt.cnt, pkt_out_cnt10.cnt);
 }
 
-static void init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
+static int init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
 {
 	struct bpf_spinlock_cnt scnt = {};
 	int err;
@@ -295,186 +237,190 @@ static void init_sk_storage(int sk_fd, __u32 pkt_out_cnt)
 	scnt.cnt = pkt_out_cnt;
 	err = bpf_map_update_elem(sk_pkt_out_cnt_fd, &sk_fd, &scnt,
 				  BPF_NOEXIST);
-	CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt_fd)",
-	      "err:%d errno:%d", err, errno);
+	if (CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt_fd)",
+		  "err:%d errno:%d\n", err, errno))
+		return err;
 
-	scnt.cnt *= 10;
 	err = bpf_map_update_elem(sk_pkt_out_cnt10_fd, &sk_fd, &scnt,
 				  BPF_NOEXIST);
-	CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt10_fd)",
-	      "err:%d errno:%d", err, errno);
+	if (CHECK(err, "bpf_map_update_elem(sk_pkt_out_cnt10_fd)",
+		  "err:%d errno:%d\n", err, errno))
+		return err;
+
+	return 0;
 }
 
 static void test(void)
 {
-	int listen_fd, cli_fd, accept_fd, epfd, err;
+	int listen_fd = -1, cli_fd = -1, accept_fd = -1, epfd, err, i;
 	struct epoll_event ev;
 	socklen_t addrlen;
-	int i;
+	char buf[DATA_LEN];
 
 	addrlen = sizeof(struct sockaddr_in6);
 	ev.events = EPOLLIN;
 
 	epfd = epoll_create(1);
-	CHECK(epfd == -1, "epoll_create()", "epfd:%d errno:%d", epfd, errno);
+	if (CHECK(epfd == -1, "epoll_create()", "epfd:%d errno:%d\n",
+		  epfd, errno))
+		return;
 
 	/* Prepare listen_fd */
 	listen_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
-	CHECK(listen_fd == -1, "socket()", "listen_fd:%d errno:%d",
-	      listen_fd, errno);
+	if (CHECK(listen_fd == -1, "socket()", "listen_fd:%d errno:%d\n",
+		  listen_fd, errno))
+		goto done;
 
 	init_loopback6(&srv_sa6);
 	err = bind(listen_fd, (struct sockaddr *)&srv_sa6, sizeof(srv_sa6));
-	CHECK(err, "bind(listen_fd)", "err:%d errno:%d", err, errno);
+	if (CHECK(err, "bind(listen_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
 
 	err = getsockname(listen_fd, (struct sockaddr *)&srv_sa6, &addrlen);
-	CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d", err, errno);
+	if (CHECK(err, "getsockname(listen_fd)", "err:%d errno:%d\n", err,
+		  errno))
+		goto done;
+	memcpy(&skel->bss->srv_sa6, &srv_sa6, sizeof(srv_sa6));
 
 	err = listen(listen_fd, 1);
-	CHECK(err, "listen(listen_fd)", "err:%d errno:%d", err, errno);
+	if (CHECK(err, "listen(listen_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
 
 	/* Prepare cli_fd */
 	cli_fd = socket(AF_INET6, SOCK_STREAM | SOCK_NONBLOCK, 0);
-	CHECK(cli_fd == -1, "socket()", "cli_fd:%d errno:%d", cli_fd, errno);
+	if (CHECK(cli_fd == -1, "socket()", "cli_fd:%d errno:%d\n", cli_fd,
+		  errno))
+		goto done;
 
 	init_loopback6(&cli_sa6);
 	err = bind(cli_fd, (struct sockaddr *)&cli_sa6, sizeof(cli_sa6));
-	CHECK(err, "bind(cli_fd)", "err:%d errno:%d", err, errno);
+	if (CHECK(err, "bind(cli_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
 
 	err = getsockname(cli_fd, (struct sockaddr *)&cli_sa6, &addrlen);
-	CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d",
-	      err, errno);
-
-	/* Update addr_map with srv_sa6 and cli_sa6 */
-	err = bpf_map_update_elem(addr_map_fd, &addr_srv_idx, &srv_sa6, 0);
-	CHECK(err, "map_update", "err:%d errno:%d", err, errno);
-
-	err = bpf_map_update_elem(addr_map_fd, &addr_cli_idx, &cli_sa6, 0);
-	CHECK(err, "map_update", "err:%d errno:%d", err, errno);
+	if (CHECK(err, "getsockname(cli_fd)", "err:%d errno:%d\n",
+		  err, errno))
+		goto done;
 
 	/* Connect from cli_sa6 to srv_sa6 */
 	err = connect(cli_fd, (struct sockaddr *)&srv_sa6, addrlen);
 	printf("srv_sa6.sin6_port:%u cli_sa6.sin6_port:%u\n\n",
 	       ntohs(srv_sa6.sin6_port), ntohs(cli_sa6.sin6_port));
-	CHECK(err && errno != EINPROGRESS,
-	      "connect(cli_fd)", "err:%d errno:%d", err, errno);
+	if (CHECK(err && errno != EINPROGRESS,
+		  "connect(cli_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
 
 	ev.data.fd = listen_fd;
 	err = epoll_ctl(epfd, EPOLL_CTL_ADD, listen_fd, &ev);
-	CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, listen_fd)", "err:%d errno:%d",
-	      err, errno);
+	if (CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, listen_fd)",
+		  "err:%d errno:%d\n", err, errno))
+		goto done;
 
 	/* Accept the connection */
 	/* Have some timeout in accept(listen_fd). Just in case. */
 	err = epoll_wait(epfd, &ev, 1, 1000);
-	CHECK(err != 1 || ev.data.fd != listen_fd,
+	if (CHECK(err != 1 || ev.data.fd != listen_fd,
 		  "epoll_wait(listen_fd)",
-	      "err:%d errno:%d ev.data.fd:%d listen_fd:%d",
-	      err, errno, ev.data.fd, listen_fd);
+		  "err:%d errno:%d ev.data.fd:%d listen_fd:%d\n",
+		  err, errno, ev.data.fd, listen_fd))
+		goto done;
 
 	accept_fd = accept(listen_fd, NULL, NULL);
-	CHECK(accept_fd == -1, "accept(listen_fd)", "accept_fd:%d errno:%d",
-	      accept_fd, errno);
-	close(listen_fd);
+	if (CHECK(accept_fd == -1, "accept(listen_fd)",
+		  "accept_fd:%d errno:%d\n",
+		  accept_fd, errno))
+		goto done;
 
 	ev.data.fd = cli_fd;
 	err = epoll_ctl(epfd, EPOLL_CTL_ADD, cli_fd, &ev);
-	CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)", "err:%d errno:%d",
-	      err, errno);
+	if (CHECK(err, "epoll_ctl(EPOLL_CTL_ADD, cli_fd)",
+		  "err:%d errno:%d\n", err, errno))
+		goto done;
 
-	init_sk_storage(accept_fd, 2);
+	if (init_sk_storage(accept_fd, 0xeB9F))
+		goto done;
 
 	for (i = 0; i < 2; i++) {
-		/* Send some data from accept_fd to cli_fd */
-		err = send(accept_fd, DATA, DATA_LEN, 0);
-		CHECK(err != DATA_LEN, "send(accept_fd)", "err:%d errno:%d",
-		      err, errno);
+		/* Send some data from accept_fd to cli_fd.
+		 * MSG_EOR to stop kernel from coalescing two pkts.
+		 */
+		err = send(accept_fd, DATA, DATA_LEN, MSG_EOR);
+		if (CHECK(err != DATA_LEN, "send(accept_fd)",
+			  "err:%d errno:%d\n", err, errno))
+			goto done;
 
 		/* Have some timeout in recv(cli_fd). Just in case. */
 		err = epoll_wait(epfd, &ev, 1, 1000);
-		CHECK(err != 1 || ev.data.fd != cli_fd,
-		      "epoll_wait(cli_fd)", "err:%d errno:%d ev.data.fd:%d cli_fd:%d",
-		      err, errno, ev.data.fd, cli_fd);
-
-		err = recv(cli_fd, NULL, 0, MSG_TRUNC);
-		CHECK(err, "recv(cli_fd)", "err:%d errno:%d", err, errno);
+		if (CHECK(err != 1 || ev.data.fd != cli_fd,
+			  "epoll_wait(cli_fd)",
+			  "err:%d errno:%d ev.data.fd:%d cli_fd:%d\n",
+			  err, errno, ev.data.fd, cli_fd))
+			goto done;
+
+		err = recv(cli_fd, buf, DATA_LEN, 0);
+		if (CHECK(err != DATA_LEN, "recv(cli_fd)", "err:%d errno:%d\n",
+			  err, errno))
+			goto done;
 	}
 
+	shutdown(cli_fd, SHUT_WR);
+	err = recv(accept_fd, buf, 1, 0);
+	if (CHECK(err, "recv(accept_fd) for fin", "err:%d errno:%d\n",
+		  err, errno))
+		goto done;
+	shutdown(accept_fd, SHUT_WR);
+	err = recv(cli_fd, buf, 1, 0);
+	if (CHECK(err, "recv(cli_fd) for fin", "err:%d errno:%d\n",
+		  err, errno))
+		goto done;
 	check_sk_pkt_out_cnt(accept_fd, cli_fd);
+	check_result();
 
-	close(epfd);
+done:
+	if (accept_fd != -1)
 		close(accept_fd);
+	if (cli_fd != -1)
 		close(cli_fd);
-
-	check_result();
+	if (listen_fd != -1)
+		close(listen_fd);
+	close(epfd);
 }
 
 void test_sock_fields(void)
 {
-	struct bpf_prog_load_attr attr = {
-		.file = "test_sock_fields.o",
-		.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
-		.prog_flags = BPF_F_TEST_RND_HI32,
-	};
-	int cgroup_fd, egress_fd, ingress_fd, err;
-	struct bpf_program *ingress_prog;
-	struct bpf_object *obj;
-	struct bpf_map *map;
+	struct bpf_link *egress_link = NULL, *ingress_link = NULL;
+	int cgroup_fd;
 
 	/* Create a cgroup, get fd, and join it */
-	cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
-	CHECK(cgroup_fd < 0, "cgroup_setup_and_join()",
-	      "cgroup_fd:%d errno:%d", cgroup_fd, errno);
-	atexit(cleanup_cgroup_environment);
-
-	err = bpf_prog_load_xattr(&attr, &obj, &egress_fd);
-	CHECK(err, "bpf_prog_load_xattr()", "err:%d", err);
-
-	ingress_prog = bpf_object__find_program_by_title(obj,
-							 "cgroup_skb/ingress");
-	CHECK(!ingress_prog,
-	      "bpf_object__find_program_by_title(cgroup_skb/ingress)",
-	      "not found");
-	ingress_fd = bpf_program__fd(ingress_prog);
-
-	err = bpf_prog_attach(egress_fd, cgroup_fd, BPF_CGROUP_INET_EGRESS, 0);
-	CHECK(err == -1, "bpf_prog_attach(CPF_CGROUP_INET_EGRESS)",
-	      "err:%d errno%d", err, errno);
-
-	err = bpf_prog_attach(ingress_fd, cgroup_fd,
-			      BPF_CGROUP_INET_INGRESS, 0);
-	CHECK(err == -1, "bpf_prog_attach(CPF_CGROUP_INET_INGRESS)",
-	      "err:%d errno%d", err, errno);
-	close(cgroup_fd);
-
-	map = bpf_object__find_map_by_name(obj, "addr_map");
-	CHECK(!map, "cannot find addr_map", "(null)");
-	addr_map_fd = bpf_map__fd(map);
-
-	map = bpf_object__find_map_by_name(obj, "sock_result_map");
-	CHECK(!map, "cannot find sock_result_map", "(null)");
-	sk_map_fd = bpf_map__fd(map);
-
-	map = bpf_object__find_map_by_name(obj, "tcp_sock_result_map");
-	CHECK(!map, "cannot find tcp_sock_result_map", "(null)");
-	tp_map_fd = bpf_map__fd(map);
-
-	map = bpf_object__find_map_by_name(obj, "linum_map");
-	CHECK(!map, "cannot find linum_map", "(null)");
-	linum_map_fd = bpf_map__fd(map);
-
-	map = bpf_object__find_map_by_name(obj, "sk_pkt_out_cnt");
-	CHECK(!map, "cannot find sk_pkt_out_cnt", "(null)");
-	sk_pkt_out_cnt_fd = bpf_map__fd(map);
-
-	map = bpf_object__find_map_by_name(obj, "sk_pkt_out_cnt10");
-	CHECK(!map, "cannot find sk_pkt_out_cnt10", "(null)");
-	sk_pkt_out_cnt10_fd = bpf_map__fd(map);
+	cgroup_fd = test__join_cgroup(TEST_CGROUP);
+	if (CHECK_FAIL(cgroup_fd < 0))
+		return;
+
+	skel = test_sock_fields__open_and_load();
+	if (CHECK(!skel, "test_sock_fields__open_and_load", "failed\n"))
+		goto done;
+
+	egress_link = bpf_program__attach_cgroup(skel->progs.egress_read_sock_fields,
+						 cgroup_fd);
+	if (CHECK(IS_ERR(egress_link), "attach_cgroup(egress)", "err:%ld\n",
+		  PTR_ERR(egress_link)))
+		goto done;
+
+	ingress_link = bpf_program__attach_cgroup(skel->progs.ingress_read_sock_fields,
+						  cgroup_fd);
+	if (CHECK(IS_ERR(ingress_link), "attach_cgroup(ingress)", "err:%ld\n",
+		  PTR_ERR(ingress_link)))
+		goto done;
+
+	linum_map_fd = bpf_map__fd(skel->maps.linum_map);
+	sk_pkt_out_cnt_fd = bpf_map__fd(skel->maps.sk_pkt_out_cnt);
+	sk_pkt_out_cnt10_fd = bpf_map__fd(skel->maps.sk_pkt_out_cnt10);
 
 	test();
 
-	bpf_object__close(obj);
-	cleanup_cgroup_environment();
-
-	printf("PASS\n");
+done:
+	bpf_link__destroy(egress_link);
+	bpf_link__destroy(ingress_link);
+	test_sock_fields__destroy(skel);
+	close(cgroup_fd);
 }

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

@@ -8,46 +8,12 @@
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
 
-enum bpf_addr_array_idx {
-	ADDR_SRV_IDX,
-	ADDR_CLI_IDX,
-	__NR_BPF_ADDR_ARRAY_IDX,
-};
-
-enum bpf_result_array_idx {
-	EGRESS_SRV_IDX,
-	EGRESS_CLI_IDX,
-	INGRESS_LISTEN_IDX,
-	__NR_BPF_RESULT_ARRAY_IDX,
-};
-
 enum bpf_linum_array_idx {
 	EGRESS_LINUM_IDX,
 	INGRESS_LINUM_IDX,
 	__NR_BPF_LINUM_ARRAY_IDX,
 };
 
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__uint(max_entries, __NR_BPF_ADDR_ARRAY_IDX);
-	__type(key, __u32);
-	__type(value, struct sockaddr_in6);
-} addr_map SEC(".maps");
-
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__uint(max_entries, __NR_BPF_RESULT_ARRAY_IDX);
-	__type(key, __u32);
-	__type(value, struct bpf_sock);
-} sock_result_map SEC(".maps");
-
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__uint(max_entries, __NR_BPF_RESULT_ARRAY_IDX);
-	__type(key, __u32);
-	__type(value, struct bpf_tcp_sock);
-} tcp_sock_result_map SEC(".maps");
-
 struct {
 	__uint(type, BPF_MAP_TYPE_ARRAY);
 	__uint(max_entries, __NR_BPF_LINUM_ARRAY_IDX);
@@ -74,6 +40,14 @@ struct {
 	__type(value, struct bpf_spinlock_cnt);
 } sk_pkt_out_cnt10 SEC(".maps");
 
+struct bpf_tcp_sock listen_tp = {};
+struct sockaddr_in6 srv_sa6 = {};
+struct bpf_tcp_sock cli_tp = {};
+struct bpf_tcp_sock srv_tp = {};
+struct bpf_sock listen_sk = {};
+struct bpf_sock srv_sk = {};
+struct bpf_sock cli_sk = {};
+
 static bool is_loopback6(__u32 *a6)
 {
 	return !a6[0] && !a6[1] && !a6[2] && a6[3] == bpf_htonl(1);
@@ -130,19 +104,20 @@ static void tpcpy(struct bpf_tcp_sock *dst,
 	dst->bytes_acked = src->bytes_acked;
 }
 
-#define RETURN {						\
+/* Always return CG_OK so that no pkt will be filtered out */
+#define CG_OK 1
+
+#define RET_LOG() ({						\
 	linum = __LINE__;					\
-	bpf_map_update_elem(&linum_map, &linum_idx, &linum, 0);	\
-	return 1;						\
-}
+	bpf_map_update_elem(&linum_map, &linum_idx, &linum, BPF_NOEXIST);	\
+	return CG_OK;						\
+})
 
 SEC("cgroup_skb/egress")
 int egress_read_sock_fields(struct __sk_buff *skb)
 {
 	struct bpf_spinlock_cnt cli_cnt_init = { .lock = 0, .cnt = 0xeB9F };
-	__u32 srv_idx = ADDR_SRV_IDX, cli_idx = ADDR_CLI_IDX, result_idx;
 	struct bpf_spinlock_cnt *pkt_out_cnt, *pkt_out_cnt10;
-	struct sockaddr_in6 *srv_sa6, *cli_sa6;
 	struct bpf_tcp_sock *tp, *tp_ret;
 	struct bpf_sock *sk, *sk_ret;
 	__u32 linum, linum_idx;
@@ -150,39 +125,46 @@ int egress_read_sock_fields(struct __sk_buff *skb)
 	linum_idx = EGRESS_LINUM_IDX;
 
 	sk = skb->sk;
-	if (!sk || sk->state == 10)
-		RETURN;
+	if (!sk)
+		RET_LOG();
 
+	/* Not the testing egress traffic or
+	 * TCP_LISTEN (10) socket will be copied at the ingress side.
+	 */
+	if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) ||
+	    sk->state == 10)
+		return CG_OK;
+
+	if (sk->src_port == bpf_ntohs(srv_sa6.sin6_port)) {
+		/* Server socket */
+		sk_ret = &srv_sk;
+		tp_ret = &srv_tp;
+	} else if (sk->dst_port == srv_sa6.sin6_port) {
+		/* Client socket */
+		sk_ret = &cli_sk;
+		tp_ret = &cli_tp;
+	} else {
+		/* Not the testing egress traffic */
+		return CG_OK;
+	}
+
+	/* It must be a fullsock for cgroup_skb/egress prog */
 	sk = bpf_sk_fullsock(sk);
-	if (!sk || sk->family != AF_INET6 || sk->protocol != IPPROTO_TCP ||
-	    !is_loopback6(sk->src_ip6))
-		RETURN;
+	if (!sk)
+		RET_LOG();
+
+	/* Not the testing egress traffic */
+	if (sk->protocol != IPPROTO_TCP)
+		return CG_OK;
 
 	tp = bpf_tcp_sock(sk);
 	if (!tp)
-		RETURN;
-
-	srv_sa6 = bpf_map_lookup_elem(&addr_map, &srv_idx);
-	cli_sa6 = bpf_map_lookup_elem(&addr_map, &cli_idx);
-	if (!srv_sa6 || !cli_sa6)
-		RETURN;
-
-	if (sk->src_port == bpf_ntohs(srv_sa6->sin6_port))
-		result_idx = EGRESS_SRV_IDX;
-	else if (sk->src_port == bpf_ntohs(cli_sa6->sin6_port))
-		result_idx = EGRESS_CLI_IDX;
-	else
-		RETURN;
-
-	sk_ret = bpf_map_lookup_elem(&sock_result_map, &result_idx);
-	tp_ret = bpf_map_lookup_elem(&tcp_sock_result_map, &result_idx);
-	if (!sk_ret || !tp_ret)
-		RETURN;
+		RET_LOG();
 
 	skcpy(sk_ret, sk);
 	tpcpy(tp_ret, tp);
 
-	if (result_idx == EGRESS_SRV_IDX) {
+	if (sk_ret == &srv_sk) {
 		/* The userspace has created it for srv sk */
 		pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, sk, 0, 0);
 		pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10, sk,
@@ -197,7 +179,7 @@ int egress_read_sock_fields(struct __sk_buff *skb)
 	}
 
 	if (!pkt_out_cnt || !pkt_out_cnt10)
-		RETURN;
+		RET_LOG();
 
 	/* Even both cnt and cnt10 have lock defined in their BTF,
 	 * intentionally one cnt takes lock while one does not
@@ -208,48 +190,44 @@ int egress_read_sock_fields(struct __sk_buff *skb)
 	pkt_out_cnt10->cnt += 10;
 	bpf_spin_unlock(&pkt_out_cnt10->lock);
 
-	RETURN;
+	return CG_OK;
 }
 
 SEC("cgroup_skb/ingress")
 int ingress_read_sock_fields(struct __sk_buff *skb)
 {
-	__u32 srv_idx = ADDR_SRV_IDX, result_idx = INGRESS_LISTEN_IDX;
-	struct bpf_tcp_sock *tp, *tp_ret;
-	struct bpf_sock *sk, *sk_ret;
-	struct sockaddr_in6 *srv_sa6;
+	struct bpf_tcp_sock *tp;
 	__u32 linum, linum_idx;
+	struct bpf_sock *sk;
 
 	linum_idx = INGRESS_LINUM_IDX;
 
 	sk = skb->sk;
-	if (!sk || sk->family != AF_INET6 || !is_loopback6(sk->src_ip6))
-		RETURN;
+	if (!sk)
+		RET_LOG();
 
-	srv_sa6 = bpf_map_lookup_elem(&addr_map, &srv_idx);
-	if (!srv_sa6 || sk->src_port != bpf_ntohs(srv_sa6->sin6_port))
-		RETURN;
+	/* Not the testing ingress traffic to the server */
+	if (sk->family != AF_INET6 || !is_loopback6(sk->src_ip6) ||
+	    sk->src_port != bpf_ntohs(srv_sa6.sin6_port))
+		return CG_OK;
 
-	if (sk->state != 10 && sk->state != 12)
-		RETURN;
+	/* Only interested in TCP_LISTEN */
+	if (sk->state != 10)
+		return CG_OK;
 
-	sk = bpf_get_listener_sock(sk);
+	/* It must be a fullsock for cgroup_skb/ingress prog */
+	sk = bpf_sk_fullsock(sk);
 	if (!sk)
-		RETURN;
+		RET_LOG();
 
 	tp = bpf_tcp_sock(sk);
 	if (!tp)
-		RETURN;
-
-	sk_ret = bpf_map_lookup_elem(&sock_result_map, &result_idx);
-	tp_ret = bpf_map_lookup_elem(&tcp_sock_result_map, &result_idx);
-	if (!sk_ret || !tp_ret)
-		RETURN;
+		RET_LOG();
 
-	skcpy(sk_ret, sk);
-	tpcpy(tp_ret, tp);
+	skcpy(&listen_sk, sk);
+	tpcpy(&listen_tp, tp);
 
-	RETURN;
+	return CG_OK;
 }
 
 char _license[] SEC("license") = "GPL";