From: Andrey Ignatov <rdna@fb.com>
Date: Wed, 18 Dec 2019 23:44:38 -0800
Subject: selftests/bpf: Test BPF_F_REPLACE in cgroup_attach_multi
Patch-mainline: v5.6-rc1
Git-commit: 06ac0186bd242d44f5703ce64ee0077b317c86bb
References: bsc#1177028
Test replacing a cgroup-bpf program attached with BPF_F_ALLOW_MULTI and
possible failure modes: invalid combination of flags, invalid
replace_bpf_fd, replacing a non-attachd to specified cgroup program.
Example of program replacing:
# gdb -q --args ./test_progs --name=cgroup_attach_multi
...
Breakpoint 1, test_cgroup_attach_multi () at cgroup_attach_multi.c:227
(gdb)
[1]+ Stopped gdb -q --args ./test_progs --name=cgroup_attach_multi
# bpftool c s /mnt/cgroup2/cgroup-test-work-dir/cg1
ID AttachType AttachFlags Name
2133 egress multi
2134 egress multi
# fg
gdb -q --args ./test_progs --name=cgroup_attach_multi
(gdb) c
Continuing.
Breakpoint 2, test_cgroup_attach_multi () at cgroup_attach_multi.c:233
(gdb)
[1]+ Stopped gdb -q --args ./test_progs --name=cgroup_attach_multi
# bpftool c s /mnt/cgroup2/cgroup-test-work-dir/cg1
ID AttachType AttachFlags Name
2139 egress multi
2134 egress multi
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/7b9b83e8d5fb82e15b034341bd40b6fb2431eeba.1576741281.git.rdna@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
tools/testing/selftests/bpf/prog_tests/cgroup_attach_multi.c | 53 ++++++++++-
1 file changed, 50 insertions(+), 3 deletions(-)
--- a/tools/testing/selftests/bpf/prog_tests/cgroup_attach_multi.c
+++ b/tools/testing/selftests/bpf/prog_tests/cgroup_attach_multi.c
@@ -78,7 +78,8 @@ void test_cgroup_attach_multi(void)
{
__u32 prog_ids[4], prog_cnt = 0, attach_flags, saved_prog_id;
int cg1 = 0, cg2 = 0, cg3 = 0, cg4 = 0, cg5 = 0, key = 0;
- int allow_prog[6] = {-1};
+ DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, attach_opts);
+ int allow_prog[7] = {-1};
unsigned long long value;
__u32 duration = 0;
int i = 0;
@@ -189,6 +190,52 @@ void test_cgroup_attach_multi(void)
CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
CHECK_FAIL(value != 1 + 2 + 8 + 16);
+ /* test replace */
+
+ attach_opts.flags = BPF_F_ALLOW_OVERRIDE | BPF_F_REPLACE;
+ attach_opts.replace_prog_fd = allow_prog[0];
+ if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
+ BPF_CGROUP_INET_EGRESS, &attach_opts),
+ "fail_prog_replace_override", "unexpected success\n"))
+ goto err;
+ CHECK_FAIL(errno != EINVAL);
+
+ attach_opts.flags = BPF_F_REPLACE;
+ if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
+ BPF_CGROUP_INET_EGRESS, &attach_opts),
+ "fail_prog_replace_no_multi", "unexpected success\n"))
+ goto err;
+ CHECK_FAIL(errno != EINVAL);
+
+ attach_opts.flags = BPF_F_ALLOW_MULTI | BPF_F_REPLACE;
+ attach_opts.replace_prog_fd = -1;
+ if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
+ BPF_CGROUP_INET_EGRESS, &attach_opts),
+ "fail_prog_replace_bad_fd", "unexpected success\n"))
+ goto err;
+ CHECK_FAIL(errno != EBADF);
+
+ /* replacing a program that is not attached to cgroup should fail */
+ attach_opts.replace_prog_fd = allow_prog[3];
+ if (CHECK(!bpf_prog_attach_xattr(allow_prog[6], cg1,
+ BPF_CGROUP_INET_EGRESS, &attach_opts),
+ "fail_prog_replace_no_ent", "unexpected success\n"))
+ goto err;
+ CHECK_FAIL(errno != ENOENT);
+
+ /* replace 1st from the top program */
+ attach_opts.replace_prog_fd = allow_prog[0];
+ if (CHECK(bpf_prog_attach_xattr(allow_prog[6], cg1,
+ BPF_CGROUP_INET_EGRESS, &attach_opts),
+ "prog_replace", "errno=%d\n", errno))
+ goto err;
+
+ value = 0;
+ CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
+ CHECK_FAIL(system(PING_CMD));
+ CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
+ CHECK_FAIL(value != 64 + 2 + 8 + 16);
+
/* detach 3rd from bottom program and ping again */
if (CHECK(!bpf_prog_detach2(0, cg3, BPF_CGROUP_INET_EGRESS),
"fail_prog_detach_from_cg3", "unexpected success\n"))
@@ -202,7 +249,7 @@ void test_cgroup_attach_multi(void)
CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
CHECK_FAIL(system(PING_CMD));
CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
- CHECK_FAIL(value != 1 + 2 + 16);
+ CHECK_FAIL(value != 64 + 2 + 16);
/* detach 2nd from bottom program and ping again */
if (CHECK(bpf_prog_detach2(-1, cg4, BPF_CGROUP_INET_EGRESS),
@@ -213,7 +260,7 @@ void test_cgroup_attach_multi(void)
CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
CHECK_FAIL(system(PING_CMD));
CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
- CHECK_FAIL(value != 1 + 2 + 4);
+ CHECK_FAIL(value != 64 + 2 + 4);
prog_cnt = 4;
CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,