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 (file)
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -23,6 +23,7 @@ hostprogs-y += map_perf_test
 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 @@ map_perf_test-objs := bpf_load.o libbpf.o map_perf_test_user.o
 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 (file)
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;
+}