samples, bpf: Add automated test for cgroup filter attachments
This patch adds the sample program test_cgrp2_attach2. This program is
similar to test_cgrp2_attach, but it performs automated testing of the
cgroupv2 BPF attached filters. It runs the following checks:
* Simple filter attachment
* Application of filters to child cgroups
* Overriding filters on child cgroups
* Checking that this still works when the parent filter is removed
The filters that are used here are simply allow all / deny all filters, so
it isn't checking the actual functionality of the filters, but rather
the behaviour around detachment / attachment. If net_cls is enabled,
this test will fail.
Signed-off-by: Sargun Dhillon <sargun@sargun.me>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 57d8494..00cd308 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -23,6 +23,7 @@
hostprogs-y += test_overhead
hostprogs-y += test_cgrp2_array_pin
hostprogs-y += test_cgrp2_attach
+hostprogs-y += test_cgrp2_attach2
hostprogs-y += test_cgrp2_sock
hostprogs-y += test_cgrp2_sock2
hostprogs-y += xdp1
@@ -54,6 +55,7 @@
test_overhead-objs := bpf_load.o libbpf.o test_overhead_user.o
test_cgrp2_array_pin-objs := libbpf.o test_cgrp2_array_pin.o
test_cgrp2_attach-objs := libbpf.o test_cgrp2_attach.o
+test_cgrp2_attach2-objs := libbpf.o test_cgrp2_attach2.o cgroup_helpers.o
test_cgrp2_sock-objs := libbpf.o test_cgrp2_sock.o
test_cgrp2_sock2-objs := bpf_load.o libbpf.o test_cgrp2_sock2.o
xdp1-objs := bpf_load.o libbpf.o xdp1_user.o
diff --git a/samples/bpf/test_cgrp2_attach2.c b/samples/bpf/test_cgrp2_attach2.c
new file mode 100644
index 0000000..ddfac42
--- /dev/null
+++ b/samples/bpf/test_cgrp2_attach2.c
@@ -0,0 +1,132 @@
+/* eBPF example program:
+ *
+ * - Creates arraymap in kernel with 4 bytes keys and 8 byte values
+ *
+ * - Loads eBPF program
+ *
+ * The eBPF program accesses the map passed in to store two pieces of
+ * information. The number of invocations of the program, which maps
+ * to the number of packets received, is stored to key 0. Key 1 is
+ * incremented on each iteration by the number of bytes stored in
+ * the skb.
+ *
+ * - Attaches the new program to a cgroup using BPF_PROG_ATTACH
+ *
+ * - Every second, reads map[0] and map[1] to see how many bytes and
+ * packets were seen on any socket of tasks in the given cgroup.
+ */
+
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <unistd.h>
+
+#include <linux/bpf.h>
+
+#include "libbpf.h"
+#include "cgroup_helpers.h"
+
+#define FOO "/foo"
+#define BAR "/foo/bar/"
+#define PING_CMD "ping -c1 -w1 127.0.0.1"
+
+static int prog_load(int verdict)
+{
+ int ret;
+ struct bpf_insn prog[] = {
+ BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
+ BPF_EXIT_INSN(),
+ };
+
+ ret = bpf_prog_load(BPF_PROG_TYPE_CGROUP_SKB,
+ prog, sizeof(prog), "GPL", 0);
+
+ if (ret < 0) {
+ log_err("Loading program");
+ printf("Output from verifier:\n%s\n-------\n", bpf_log_buf);
+ return 0;
+ }
+ return ret;
+}
+
+
+int main(int argc, char **argv)
+{
+ int drop_prog, allow_prog, foo = 0, bar = 0, rc = 0;
+
+ allow_prog = prog_load(1);
+ if (!allow_prog)
+ goto err;
+
+ drop_prog = prog_load(0);
+ if (!drop_prog)
+ goto err;
+
+ if (setup_cgroup_environment())
+ goto err;
+
+ /* Create cgroup /foo, get fd, and join it */
+ foo = create_and_get_cgroup(FOO);
+ if (!foo)
+ goto err;
+
+ if (join_cgroup(FOO))
+ goto err;
+
+ if (bpf_prog_attach(drop_prog, foo, BPF_CGROUP_INET_EGRESS)) {
+ log_err("Attaching prog to /foo");
+ goto err;
+ }
+
+ assert(system(PING_CMD) != 0);
+
+ /* Create cgroup /foo/bar, get fd, and join it */
+ bar = create_and_get_cgroup(BAR);
+ if (!bar)
+ goto err;
+
+ if (join_cgroup(BAR))
+ goto err;
+
+ assert(system(PING_CMD) != 0);
+
+ if (bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS)) {
+ log_err("Attaching prog to /foo/bar");
+ goto err;
+ }
+
+ assert(system(PING_CMD) == 0);
+
+
+ if (bpf_prog_detach(bar, BPF_CGROUP_INET_EGRESS)) {
+ log_err("Detaching program from /foo/bar");
+ goto err;
+ }
+
+ assert(system(PING_CMD) != 0);
+
+ if (bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS)) {
+ log_err("Attaching prog to /foo/bar");
+ goto err;
+ }
+
+ if (bpf_prog_detach(foo, BPF_CGROUP_INET_EGRESS)) {
+ log_err("Detaching program from /foo");
+ goto err;
+ }
+
+ assert(system(PING_CMD) == 0);
+
+ goto out;
+
+err:
+ rc = 1;
+
+out:
+ close(foo);
+ close(bar);
+ cleanup_cgroup_environment();
+ return rc;
+}