// SPDX-License-Identifier: GPL-2.0
#include <uapi/linux/bpf.h>
#include <linux/if_link.h>
#include <test_progs.h>
#include <network_helpers.h>

#include "test_xdp_with_cpumap_frags_helpers.skel.h"
#include "test_xdp_with_cpumap_helpers.skel.h"

#define IFINDEX_LO      1
#define TEST_NS "cpu_attach_ns"

static void test_xdp_with_cpumap_helpers(void)
{
        struct test_xdp_with_cpumap_helpers *skel = NULL;
        struct bpf_prog_info info = {};
        __u32 len = sizeof(info);
        struct bpf_cpumap_val val = {
                .qsize = 192,
        };
        int err, prog_fd, prog_redir_fd, map_fd, bad_fd;
        struct nstoken *nstoken = NULL;
        __u32 idx = 0;

        SYS(out_close, "ip netns add %s", TEST_NS);
        nstoken = open_netns(TEST_NS);
        if (!ASSERT_OK_PTR(nstoken, "open_netns"))
                goto out_close;
        SYS(out_close, "ip link set dev lo up");

        skel = test_xdp_with_cpumap_helpers__open_and_load();
        if (!ASSERT_OK_PTR(skel, "test_xdp_with_cpumap_helpers__open_and_load"))
                return;

        prog_redir_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
        err = bpf_xdp_attach(IFINDEX_LO, prog_redir_fd, XDP_FLAGS_SKB_MODE, NULL);
        if (!ASSERT_OK(err, "Generic attach of program with 8-byte CPUMAP"))
                goto out_close;

        prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
        map_fd = bpf_map__fd(skel->maps.cpu_map);
        err = bpf_prog_get_info_by_fd(prog_fd, &info, &len);
        if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
                goto out_close;

        val.bpf_prog.fd = prog_fd;
        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_OK(err, "Add program to cpumap entry");

        err = bpf_map_lookup_elem(map_fd, &idx, &val);
        ASSERT_OK(err, "Read cpumap entry");
        ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to cpumap entry prog_id");

        /* send a packet to trigger any potential bugs in there */
        char data[ETH_HLEN] = {};
        DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
                            .data_in = &data,
                            .data_size_in = sizeof(data),
                            .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
                            .repeat = 1,
                );
        err = bpf_prog_test_run_opts(prog_redir_fd, &opts);
        ASSERT_OK(err, "XDP test run");

        /* wait for the packets to be flushed, then check that redirect has been
         * performed
         */
        kern_sync_rcu();
        ASSERT_NEQ(skel->bss->redirect_count, 0, "redirected packets");

        err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
        ASSERT_OK(err, "XDP program detach");

        /* can not attach BPF_XDP_CPUMAP program to a device */
        err = bpf_xdp_attach(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE, NULL);
        if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_CPUMAP program"))
                bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);

        val.qsize = 192;
        val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_EQ(err, -EINVAL, "Add non-BPF_XDP_CPUMAP program to cpumap entry");

        /* Try to attach non-BPF file descriptor */
        bad_fd = open("/dev/null", O_RDONLY);
        ASSERT_GE(bad_fd, 0, "Open /dev/null for non-BPF fd");

        val.bpf_prog.fd = bad_fd;
        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_EQ(err, -EINVAL, "Add non-BPF fd to cpumap entry");

        /* Try to attach nonexistent file descriptor */
        err = close(bad_fd);
        ASSERT_EQ(err, 0, "Close non-BPF fd for nonexistent fd");

        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_EQ(err, -EBADF, "Add nonexistent fd to cpumap entry");

        /* Try to attach BPF_XDP program with frags to cpumap when we have
         * already loaded a BPF_XDP program on the map
         */
        idx = 1;
        val.qsize = 192;
        val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_cm_frags);
        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_NEQ(err, 0, "Add BPF_XDP program with frags to cpumap entry");

out_close:
        close_netns(nstoken);
        SYS_NOFAIL("ip netns del %s", TEST_NS);
        test_xdp_with_cpumap_helpers__destroy(skel);
}

static void test_xdp_with_cpumap_frags_helpers(void)
{
        struct test_xdp_with_cpumap_frags_helpers *skel;
        struct bpf_prog_info info = {};
        __u32 len = sizeof(info);
        struct bpf_cpumap_val val = {
                .qsize = 192,
        };
        int err, frags_prog_fd, map_fd;
        __u32 idx = 0;

        skel = test_xdp_with_cpumap_frags_helpers__open_and_load();
        if (!ASSERT_OK_PTR(skel, "test_xdp_with_cpumap_helpers__open_and_load"))
                return;

        frags_prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm_frags);
        map_fd = bpf_map__fd(skel->maps.cpu_map);
        err = bpf_prog_get_info_by_fd(frags_prog_fd, &info, &len);
        if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
                goto out_close;

        val.bpf_prog.fd = frags_prog_fd;
        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_OK(err, "Add program to cpumap entry");

        err = bpf_map_lookup_elem(map_fd, &idx, &val);
        ASSERT_OK(err, "Read cpumap entry");
        ASSERT_EQ(info.id, val.bpf_prog.id,
                  "Match program id to cpumap entry prog_id");

        /* Try to attach BPF_XDP program to cpumap when we have
         * already loaded a BPF_XDP program with frags on the map
         */
        idx = 1;
        val.qsize = 192;
        val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
        err = bpf_map_update_elem(map_fd, &idx, &val, 0);
        ASSERT_NEQ(err, 0, "Add BPF_XDP program to cpumap entry");

out_close:
        test_xdp_with_cpumap_frags_helpers__destroy(skel);
}

void test_xdp_cpumap_attach(void)
{
        if (test__start_subtest("CPUMAP with programs in entries"))
                test_xdp_with_cpumap_helpers();

        if (test__start_subtest("CPUMAP with frags programs in entries"))
                test_xdp_with_cpumap_frags_helpers();
}