// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */

#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>

#include "test_progs.h"
#include "network_helpers.h"
#include "decap_sanity.skel.h"

#define NS_TEST "decap_sanity_ns"
#define IPV6_IFACE_ADDR "face::1"
#define UDP_TEST_PORT 7777

void test_decap_sanity(void)
{
        LIBBPF_OPTS(bpf_tc_hook, qdisc_hook, .attach_point = BPF_TC_EGRESS);
        LIBBPF_OPTS(bpf_tc_opts, tc_attach);
        struct nstoken *nstoken = NULL;
        struct decap_sanity *skel;
        struct sockaddr_in6 addr;
        socklen_t addrlen;
        char buf[128] = {};
        int sockfd, err;

        skel = decap_sanity__open_and_load();
        if (!ASSERT_OK_PTR(skel, "skel open_and_load"))
                return;

        SYS(fail, "ip netns add %s", NS_TEST);
        SYS(fail, "ip -net %s -6 addr add %s/128 dev lo nodad", NS_TEST, IPV6_IFACE_ADDR);
        SYS(fail, "ip -net %s link set dev lo up", NS_TEST);

        nstoken = open_netns(NS_TEST);
        if (!ASSERT_OK_PTR(nstoken, "open_netns"))
                goto fail;

        qdisc_hook.ifindex = if_nametoindex("lo");
        if (!ASSERT_GT(qdisc_hook.ifindex, 0, "if_nametoindex lo"))
                goto fail;

        err = bpf_tc_hook_create(&qdisc_hook);
        if (!ASSERT_OK(err, "create qdisc hook"))
                goto fail;

        tc_attach.prog_fd = bpf_program__fd(skel->progs.decap_sanity);
        err = bpf_tc_attach(&qdisc_hook, &tc_attach);
        if (!ASSERT_OK(err, "attach filter"))
                goto fail;

        addrlen = sizeof(addr);
        err = make_sockaddr(AF_INET6, IPV6_IFACE_ADDR, UDP_TEST_PORT,
                            (void *)&addr, &addrlen);
        if (!ASSERT_OK(err, "make_sockaddr"))
                goto fail;
        sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
        if (!ASSERT_NEQ(sockfd, -1, "socket"))
                goto fail;
        err = sendto(sockfd, buf, sizeof(buf), 0, (void *)&addr, addrlen);
        close(sockfd);
        if (!ASSERT_EQ(err, sizeof(buf), "send"))
                goto fail;

        ASSERT_TRUE(skel->bss->init_csum_partial, "init_csum_partial");
        ASSERT_TRUE(skel->bss->final_csum_none, "final_csum_none");
        ASSERT_FALSE(skel->bss->broken_csum_start, "broken_csum_start");

fail:
        if (nstoken) {
                bpf_tc_hook_destroy(&qdisc_hook);
                close_netns(nstoken);
        }
        SYS_NOFAIL("ip netns del " NS_TEST);
        decap_sanity__destroy(skel);
}