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From: Martin KaFai Lau <kafai@fb.com>
To: <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>,
	Lorenz Bauer <lmb@cloudflare.com>, <netdev@vger.kernel.org>
Subject: [PATCH v4 bpf-next 11/13] bpf: selftest: Use bpf_skc_to_tcp_sock() in the sock_fields test
Date: Thu, 24 Sep 2020 17:04:46 -0700	[thread overview]
Message-ID: <20200925000446.3858975-1-kafai@fb.com> (raw)
In-Reply-To: <20200925000337.3853598-1-kafai@fb.com>

This test uses bpf_skc_to_tcp_sock() to get a kernel tcp_sock ptr "ktp".
Access the ktp->lsndtime and also pass ktp to bpf_sk_storage_get().

It also exercises the bpf_sk_cgroup_id() and bpf_sk_ancestor_cgroup_id()
with the "ktp".  To do that, a parent cgroup and a child cgroup are
created.  The bpf prog is attached to the child cgroup.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
---
 .../selftests/bpf/prog_tests/sock_fields.c    | 40 +++++++++++++++----
 .../selftests/bpf/progs/test_sock_fields.c    | 24 ++++++++++-
 2 files changed, 55 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sock_fields.c b/tools/testing/selftests/bpf/prog_tests/sock_fields.c
index eea8b96bb1be..66e83b8fc69d 100644
--- a/tools/testing/selftests/bpf/prog_tests/sock_fields.c
+++ b/tools/testing/selftests/bpf/prog_tests/sock_fields.c
@@ -29,7 +29,8 @@ struct bpf_spinlock_cnt {
 	__u32 cnt;
 };
 
-#define TEST_CGROUP "/test-bpf-sock-fields"
+#define PARENT_CGROUP	"/test-bpf-sock-fields"
+#define CHILD_CGROUP	"/test-bpf-sock-fields/child"
 #define DATA "Hello BPF!"
 #define DATA_LEN sizeof(DATA)
 
@@ -37,6 +38,8 @@ 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 __u64 parent_cg_id;
+static __u64 child_cg_id;
 static int linum_map_fd;
 static __u32 duration;
 
@@ -142,6 +145,8 @@ static void check_result(void)
 	      "srv_sk", "Unexpected. Check srv_sk output. egress_linum:%u\n",
 	      egress_linum);
 
+	CHECK(!skel->bss->lsndtime, "srv_tp", "Unexpected lsndtime:0\n");
+
 	CHECK(cli_sk.state == 10 ||
 	      !cli_sk.state ||
 	      cli_sk.family != AF_INET6 ||
@@ -178,6 +183,14 @@ static void check_result(void)
 	      cli_tp.bytes_received < 2 * DATA_LEN,
 	      "cli_tp", "Unexpected. Check cli_tp output. egress_linum:%u\n",
 	      egress_linum);
+
+	CHECK(skel->bss->parent_cg_id != parent_cg_id,
+	      "parent_cg_id", "%zu != %zu\n",
+	      (size_t)skel->bss->parent_cg_id, (size_t)parent_cg_id);
+
+	CHECK(skel->bss->child_cg_id != child_cg_id,
+	      "child_cg_id", "%zu != %zu\n",
+	       (size_t)skel->bss->child_cg_id, (size_t)child_cg_id);
 }
 
 static void check_sk_pkt_out_cnt(int accept_fd, int cli_fd)
@@ -319,25 +332,35 @@ static void test(void)
 void test_sock_fields(void)
 {
 	struct bpf_link *egress_link = NULL, *ingress_link = NULL;
-	int cgroup_fd;
+	int parent_cg_fd = -1, child_cg_fd = -1;
 
 	/* Create a cgroup, get fd, and join it */
-	cgroup_fd = test__join_cgroup(TEST_CGROUP);
-	if (CHECK_FAIL(cgroup_fd < 0))
+	parent_cg_fd = test__join_cgroup(PARENT_CGROUP);
+	if (CHECK_FAIL(parent_cg_fd < 0))
 		return;
+	parent_cg_id = get_cgroup_id(PARENT_CGROUP);
+	if (CHECK_FAIL(!parent_cg_id))
+		goto done;
+
+	child_cg_fd = test__join_cgroup(CHILD_CGROUP);
+	if (CHECK_FAIL(child_cg_fd < 0))
+		goto done;
+	child_cg_id = get_cgroup_id(CHILD_CGROUP);
+	if (CHECK_FAIL(!child_cg_id))
+		goto done;
 
 	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);
+						 child_cg_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);
+						  child_cg_fd);
 	if (CHECK(IS_ERR(ingress_link), "attach_cgroup(ingress)", "err:%ld\n",
 		  PTR_ERR(ingress_link)))
 		goto done;
@@ -352,5 +375,8 @@ void test_sock_fields(void)
 	bpf_link__destroy(egress_link);
 	bpf_link__destroy(ingress_link);
 	test_sock_fields__destroy(skel);
-	close(cgroup_fd);
+	if (child_cg_fd != -1)
+		close(child_cg_fd);
+	if (parent_cg_fd != -1)
+		close(parent_cg_fd);
 }
diff --git a/tools/testing/selftests/bpf/progs/test_sock_fields.c b/tools/testing/selftests/bpf/progs/test_sock_fields.c
index 370e33a858db..81b57b9aaaea 100644
--- a/tools/testing/selftests/bpf/progs/test_sock_fields.c
+++ b/tools/testing/selftests/bpf/progs/test_sock_fields.c
@@ -7,6 +7,7 @@
 
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_tcp_helpers.h"
 
 enum bpf_linum_array_idx {
 	EGRESS_LINUM_IDX,
@@ -47,6 +48,9 @@ struct bpf_tcp_sock srv_tp = {};
 struct bpf_sock listen_sk = {};
 struct bpf_sock srv_sk = {};
 struct bpf_sock cli_sk = {};
+__u64 parent_cg_id = 0;
+__u64 child_cg_id = 0;
+__u64 lsndtime = 0;
 
 static bool is_loopback6(__u32 *a6)
 {
@@ -121,6 +125,7 @@ int egress_read_sock_fields(struct __sk_buff *skb)
 	struct bpf_tcp_sock *tp, *tp_ret;
 	struct bpf_sock *sk, *sk_ret;
 	__u32 linum, linum_idx;
+	struct tcp_sock *ktp;
 
 	linum_idx = EGRESS_LINUM_IDX;
 
@@ -165,9 +170,24 @@ int egress_read_sock_fields(struct __sk_buff *skb)
 	tpcpy(tp_ret, tp);
 
 	if (sk_ret == &srv_sk) {
+		ktp = bpf_skc_to_tcp_sock(sk);
+
+		if (!ktp)
+			RET_LOG();
+
+		lsndtime = ktp->lsndtime;
+
+		child_cg_id = bpf_sk_cgroup_id(ktp);
+		if (!child_cg_id)
+			RET_LOG();
+
+		parent_cg_id = bpf_sk_ancestor_cgroup_id(ktp, 2);
+		if (!parent_cg_id)
+			RET_LOG();
+
 		/* 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,
+		pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, ktp, 0, 0);
+		pkt_out_cnt10 = bpf_sk_storage_get(&sk_pkt_out_cnt10, ktp,
 						   0, 0);
 	} else {
 		pkt_out_cnt = bpf_sk_storage_get(&sk_pkt_out_cnt, sk,
-- 
2.24.1


  parent reply	other threads:[~2020-09-25  0:04 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-25  0:03 [PATCH v4 bpf-next 00/13] bpf: Enable bpf_skc_to_* sock casting helper to networking prog type Martin KaFai Lau
2020-09-25  0:03 ` [PATCH v4 bpf-next 01/13] bpf: Move the PTR_TO_BTF_ID check to check_reg_type() Martin KaFai Lau
2020-09-25  8:22   ` Lorenz Bauer
2020-09-25 13:36   ` John Fastabend
2020-09-25  0:03 ` [PATCH v4 bpf-next 02/13] bpf: Enable bpf_skc_to_* sock casting helper to networking prog type Martin KaFai Lau
2020-09-25  8:26   ` Lorenz Bauer
2020-09-25 13:18     ` Martin KaFai Lau
2020-09-25 13:50       ` Lorenz Bauer
2020-09-25 15:47         ` Alexei Starovoitov
2020-09-25 14:21   ` John Fastabend
2020-09-25  0:03 ` [PATCH v4 bpf-next 03/13] bpf: Change bpf_sk_release and bpf_sk_*cgroup_id to accept ARG_PTR_TO_BTF_ID_SOCK_COMMON Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 04/13] bpf: Change bpf_sk_storage_*() " Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 05/13] bpf: Change bpf_tcp_*_syncookie " Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 06/13] bpf: Change bpf_sk_assign " Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 07/13] bpf: selftest: Add ref_tracking verifier test for bpf_skc casting Martin KaFai Lau
2020-09-25  8:30   ` Lorenz Bauer
2020-09-25  0:04 ` [PATCH v4 bpf-next 08/13] bpf: selftest: Move sock_fields test into test_progs Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 09/13] bpf: selftest: Adapt sock_fields test to use skel and global variables Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 10/13] bpf: selftest: Use network_helpers in the sock_fields test Martin KaFai Lau
2020-09-25  0:04 ` Martin KaFai Lau [this message]
2020-09-25  0:04 ` [PATCH v4 bpf-next 12/13] bpf: selftest: Remove enum tcp_ca_state from bpf_tcp_helpers.h Martin KaFai Lau
2020-09-25  0:04 ` [PATCH v4 bpf-next 13/13] bpf: selftest: Add test_btf_skc_cls_ingress Martin KaFai Lau
2020-09-25 16:24   ` John Fastabend
2020-09-25 17:58     ` Martin KaFai Lau
2020-09-25  9:40 ` [PATCH v4 bpf-next 00/13] bpf: Enable bpf_skc_to_* sock casting helper to networking prog type Lorenz Bauer
2020-09-25 23:22 ` Alexei Starovoitov

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