// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include <netinet/tcp.h>
#include "sockopt_qos_to_cc.skel.h"

static void run_setsockopt_test(int cg_fd, int sock_fd)
{
        socklen_t optlen;
        char cc[16]; /* TCP_CA_NAME_MAX */
        int buf;
        int err = -1;

        buf = 0x2D;
        err = setsockopt(sock_fd, SOL_IPV6, IPV6_TCLASS, &buf, sizeof(buf));
        if (!ASSERT_OK(err, "setsockopt(sock_fd, IPV6_TCLASS)"))
                return;

        /* Verify the setsockopt cc change */
        optlen = sizeof(cc);
        err = getsockopt(sock_fd, SOL_TCP, TCP_CONGESTION, cc, &optlen);
        if (!ASSERT_OK(err, "getsockopt(sock_fd, TCP_CONGESTION)"))
                return;

        if (!ASSERT_STREQ(cc, "reno", "getsockopt(sock_fd, TCP_CONGESTION)"))
                return;
}

void test_sockopt_qos_to_cc(void)
{
        struct sockopt_qos_to_cc *skel;
        char cc_cubic[16] = "cubic"; /* TCP_CA_NAME_MAX */
        int cg_fd = -1;
        int sock_fd = -1;
        int err;

        cg_fd = test__join_cgroup("/sockopt_qos_to_cc");
        if (!ASSERT_GE(cg_fd, 0, "cg-join(sockopt_qos_to_cc)"))
                return;

        skel = sockopt_qos_to_cc__open_and_load();
        if (!ASSERT_OK_PTR(skel, "skel"))
                goto done;

        skel->bss->page_size = sysconf(_SC_PAGESIZE);

        sock_fd = socket(AF_INET6, SOCK_STREAM, 0);
        if (!ASSERT_GE(sock_fd, 0, "v6 socket open"))
                goto done;

        err = setsockopt(sock_fd, SOL_TCP, TCP_CONGESTION, &cc_cubic,
                         sizeof(cc_cubic));
        if (!ASSERT_OK(err, "setsockopt(sock_fd, TCP_CONGESTION)"))
                goto done;

        skel->links.sockopt_qos_to_cc =
                bpf_program__attach_cgroup(skel->progs.sockopt_qos_to_cc,
                                           cg_fd);
        if (!ASSERT_OK_PTR(skel->links.sockopt_qos_to_cc,
                           "prog_attach(sockopt_qos_to_cc)"))
                goto done;

        run_setsockopt_test(cg_fd, sock_fd);

done:
        if (sock_fd != -1)
                close(sock_fd);
        if (cg_fd != -1)
                close(cg_fd);
        /* destroy can take null and error pointer */
        sockopt_qos_to_cc__destroy(skel);
}