// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>

#include "cgroup_helpers.h"

#define FOO             "/foo"
#define BAR             "/foo/bar/"
#define PING_CMD        "ping -q -c1 -w1 127.0.0.1 > /dev/null"

static char bpf_log_buf[BPF_LOG_BUF_SIZE];

static int prog_load(int verdict)
{
        struct bpf_insn prog[] = {
                BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
                BPF_EXIT_INSN(),
        };
        size_t insns_cnt = ARRAY_SIZE(prog);

        return bpf_test_load_program(BPF_PROG_TYPE_CGROUP_SKB,
                               prog, insns_cnt, "GPL", 0,
                               bpf_log_buf, BPF_LOG_BUF_SIZE);
}

void serial_test_cgroup_attach_override(void)
{
        int drop_prog = -1, allow_prog = -1, foo = -1, bar = -1;
        __u32 duration = 0;

        allow_prog = prog_load(1);
        if (CHECK(allow_prog < 0, "prog_load_allow",
                  "verifier output:\n%s\n-------\n", bpf_log_buf))
                goto err;

        drop_prog = prog_load(0);
        if (CHECK(drop_prog < 0, "prog_load_drop",
                  "verifier output:\n%s\n-------\n", bpf_log_buf))
                goto err;

        foo = test__join_cgroup(FOO);
        if (CHECK(foo < 0, "cgroup_join_foo", "cgroup setup failed\n"))
                goto err;

        if (CHECK(bpf_prog_attach(drop_prog, foo, BPF_CGROUP_INET_EGRESS,
                                  BPF_F_ALLOW_OVERRIDE),
                  "prog_attach_drop_foo_override",
                  "attach prog to %s failed, errno=%d\n", FOO, errno))
                goto err;

        if (CHECK(!system(PING_CMD), "ping_fail",
                  "ping unexpectedly succeeded\n"))
                goto err;

        bar = test__join_cgroup(BAR);
        if (CHECK(bar < 0, "cgroup_join_bar", "cgroup setup failed\n"))
                goto err;

        if (CHECK(!system(PING_CMD), "ping_fail",
                  "ping unexpectedly succeeded\n"))
                goto err;

        if (CHECK(bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS,
                                  BPF_F_ALLOW_OVERRIDE),
                  "prog_attach_allow_bar_override",
                  "attach prog to %s failed, errno=%d\n", BAR, errno))
                goto err;

        if (CHECK(system(PING_CMD), "ping_ok", "ping failed\n"))
                goto err;

        if (CHECK(bpf_prog_detach(bar, BPF_CGROUP_INET_EGRESS),
                  "prog_detach_bar",
                  "detach prog from %s failed, errno=%d\n", BAR, errno))
                goto err;

        if (CHECK(!system(PING_CMD), "ping_fail",
                  "ping unexpectedly succeeded\n"))
                goto err;

        if (CHECK(bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS,
                                  BPF_F_ALLOW_OVERRIDE),
                  "prog_attach_allow_bar_override",
                  "attach prog to %s failed, errno=%d\n", BAR, errno))
                goto err;

        if (CHECK(bpf_prog_detach(foo, BPF_CGROUP_INET_EGRESS),
                  "prog_detach_foo",
                  "detach prog from %s failed, errno=%d\n", FOO, errno))
                goto err;

        if (CHECK(system(PING_CMD), "ping_ok", "ping failed\n"))
                goto err;

        if (CHECK(bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS,
                                  BPF_F_ALLOW_OVERRIDE),
                  "prog_attach_allow_bar_override",
                  "attach prog to %s failed, errno=%d\n", BAR, errno))
                goto err;

        if (CHECK(!bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS, 0),
                  "fail_prog_attach_allow_bar_none",
                  "attach prog to %s unexpectedly succeeded\n", BAR))
                goto err;

        if (CHECK(bpf_prog_detach(bar, BPF_CGROUP_INET_EGRESS),
                  "prog_detach_bar",
                  "detach prog from %s failed, errno=%d\n", BAR, errno))
                goto err;

        if (CHECK(!bpf_prog_detach(foo, BPF_CGROUP_INET_EGRESS),
                  "fail_prog_detach_foo",
                  "double detach from %s unexpectedly succeeded\n", FOO))
                goto err;

        if (CHECK(bpf_prog_attach(allow_prog, foo, BPF_CGROUP_INET_EGRESS, 0),
                  "prog_attach_allow_foo_none",
                  "attach prog to %s failed, errno=%d\n", FOO, errno))
                goto err;

        if (CHECK(!bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS, 0),
                  "fail_prog_attach_allow_bar_none",
                  "attach prog to %s unexpectedly succeeded\n", BAR))
                goto err;

        if (CHECK(!bpf_prog_attach(allow_prog, bar, BPF_CGROUP_INET_EGRESS,
                                   BPF_F_ALLOW_OVERRIDE),
                  "fail_prog_attach_allow_bar_override",
                  "attach prog to %s unexpectedly succeeded\n", BAR))
                goto err;

        if (CHECK(!bpf_prog_attach(allow_prog, foo, BPF_CGROUP_INET_EGRESS,
                                   BPF_F_ALLOW_OVERRIDE),
                  "fail_prog_attach_allow_foo_override",
                  "attach prog to %s unexpectedly succeeded\n", FOO))
                goto err;

        if (CHECK(bpf_prog_attach(drop_prog, foo, BPF_CGROUP_INET_EGRESS, 0),
                  "prog_attach_drop_foo_none",
                  "attach prog to %s failed, errno=%d\n", FOO, errno))
                goto err;

err:
        close(foo);
        close(bar);
        close(allow_prog);
        close(drop_prog);
}