// SPDX-License-Identifier: GPL-2.0
#include <error.h>
#include <test_progs.h>
#include <linux/pkt_cls.h>

#include "test_tc_change_tail.skel.h"
#include "socket_helpers.h"

#define LO_IFINDEX 1

void test_tc_change_tail(void)
{
        LIBBPF_OPTS(bpf_tcx_opts, tcx_opts);
        struct test_tc_change_tail *skel = NULL;
        struct bpf_link *link;
        int c1, p1;
        char buf[2];
        int ret;

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

        link = bpf_program__attach_tcx(skel->progs.change_tail, LO_IFINDEX,
                                     &tcx_opts);
        if (!ASSERT_OK_PTR(link, "bpf_program__attach_tcx"))
                goto destroy;

        skel->links.change_tail = link;
        ret = create_pair(AF_INET, SOCK_DGRAM, &c1, &p1);
        if (!ASSERT_OK(ret, "create_pair"))
                goto destroy;

        ret = xsend(p1, "Tr", 2, 0);
        ASSERT_EQ(ret, 2, "xsend(p1)");
        ret = recv(c1, buf, 2, 0);
        ASSERT_EQ(ret, 2, "recv(c1)");
        ASSERT_EQ(skel->data->change_tail_ret, 0, "change_tail_ret");

        ret = xsend(p1, "G", 1, 0);
        ASSERT_EQ(ret, 1, "xsend(p1)");
        ret = recv(c1, buf, 2, 0);
        ASSERT_EQ(ret, 1, "recv(c1)");
        ASSERT_EQ(skel->data->change_tail_ret, 0, "change_tail_ret");

        ret = xsend(p1, "E", 1, 0);
        ASSERT_EQ(ret, 1, "xsend(p1)");
        ret = recv(c1, buf, 1, 0);
        ASSERT_EQ(ret, 1, "recv(c1)");
        ASSERT_EQ(skel->data->change_tail_ret, -EINVAL, "change_tail_ret");

        ret = xsend(p1, "Z", 1, 0);
        ASSERT_EQ(ret, 1, "xsend(p1)");
        ret = recv(c1, buf, 1, 0);
        ASSERT_EQ(ret, 1, "recv(c1)");
        ASSERT_EQ(skel->data->change_tail_ret, -EINVAL, "change_tail_ret");

        close(c1);
        close(p1);
destroy:
        test_tc_change_tail__destroy(skel);
}