#include "test_ip6.h"

#include "lwip/ethip6.h"
#include "lwip/ip6.h"
#include "lwip/icmp6.h"
#include "lwip/inet_chksum.h"
#include "lwip/nd6.h"
#include "lwip/stats.h"
#include "lwip/prot/ethernet.h"
#include "lwip/prot/ip.h"
#include "lwip/prot/ip6.h"

#include "lwip/tcpip.h"

#if LWIP_IPV6 /* allow to build the unit tests without IPv6 support */

static struct netif test_netif6;
static int linkoutput_ctr;
static int linkoutput_byte_ctr;

static err_t
default_netif_linkoutput(struct netif *netif, struct pbuf *p)
{
  fail_unless(netif == &test_netif6);
  fail_unless(p != NULL);
  linkoutput_ctr++;
  linkoutput_byte_ctr += p->tot_len;
  return ERR_OK;
}

static err_t
default_netif_init(struct netif *netif)
{
  fail_unless(netif != NULL);
  netif->linkoutput = default_netif_linkoutput;
  netif->output_ip6 = ethip6_output;
  netif->mtu = 1500;
  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHERNET | NETIF_FLAG_MLD6;
  netif->hwaddr_len = ETH_HWADDR_LEN;
  return ERR_OK;
}

static void
default_netif_add(void)
{
  struct netif *n;
  fail_unless(netif_default == NULL);
  n = netif_add_noaddr(&test_netif6, NULL, default_netif_init, NULL);
  fail_unless(n == &test_netif6);
  netif_set_default(&test_netif6);
}

static void
default_netif_remove(void)
{
  fail_unless(netif_default == &test_netif6);
  netif_remove(&test_netif6);
}

static void
ip6_test_handle_timers(int count)
{
  int i;
  for (i = 0; i < count; i++) {
    nd6_tmr();
  }
}

/* Helper functions */
static void
create_ip6_input_fragment(u32_t ip_id, u16_t start, u16_t len, int last, u8_t next_hdr)
{
  struct pbuf* p;
  struct netif* input_netif = netif_list; /* just use any netif */
  fail_unless((start & 7) == 0);
  fail_unless(((len & 7) == 0) || last);
  fail_unless(input_netif != NULL);

  p = pbuf_alloc(PBUF_RAW, len + sizeof(struct ip6_frag_hdr) +
    sizeof(struct ip6_hdr), PBUF_RAM);
  fail_unless(p != NULL);
  if (p != NULL) {
    err_t err;
    struct ip6_frag_hdr* fraghdr;

    struct ip6_hdr* ip6hdr = (struct ip6_hdr*)p->payload;
    IP6H_VTCFL_SET(ip6hdr, 6, 0, 0);
    IP6H_PLEN_SET(ip6hdr, len + sizeof(struct ip6_frag_hdr));
    IP6H_NEXTH_SET(ip6hdr, IP6_NEXTH_FRAGMENT);
    IP6H_HOPLIM_SET(ip6hdr, 64);
    ip6_addr_copy_to_packed(ip6hdr->src, *netif_ip6_addr(input_netif, 0));
    ip6hdr->src.addr[3]++;
    ip6_addr_copy_to_packed(ip6hdr->dest, *netif_ip6_addr(input_netif, 0));

    fraghdr = (struct ip6_frag_hdr*)(ip6hdr + 1);
    fraghdr->_nexth = next_hdr;
    fraghdr->reserved = 0;
    if (last) {
      fraghdr->_fragment_offset = htons(start & ~7);
    } else {
      fraghdr->_fragment_offset = htons((start & ~7) | 1);
    }
    fraghdr->_identification = htonl(ip_id);

    err = ip6_input(p, input_netif);
    if (err != ERR_OK) {
      pbuf_free(p);
    }
    fail_unless(err == ERR_OK);
  }
}

/* Setups/teardown functions */

static void
ip6_setup(void)
{
  default_netif_add();
  lwip_check_ensure_no_alloc(SKIP_POOL(MEMP_SYS_TIMEOUT));
}

static void
ip6_teardown(void)
{
  if (netif_list->loop_first != NULL) {
    pbuf_free(netif_list->loop_first);
    netif_list->loop_first = NULL;
  }
  netif_list->loop_last = NULL;
  /* poll until all memory is released... */
  tcpip_thread_poll_one();
  default_netif_remove();
  lwip_check_ensure_no_alloc(SKIP_POOL(MEMP_SYS_TIMEOUT));
}


/* Test functions */

static void
test_ip6_ll_addr_iter(int expected_ctr1, int expected_ctr2)
{
  fail_unless(linkoutput_ctr == 0);

  /* test that nothing is sent with link uo but netif down */
  netif_set_link_up(&test_netif6);
  ip6_test_handle_timers(500);
  fail_unless(linkoutput_ctr == 0);
  netif_set_link_down(&test_netif6);
  fail_unless(linkoutput_ctr == 0);

  /* test that nothing is sent with link down but netif up */
  netif_set_up(&test_netif6);
  ip6_test_handle_timers(500);
  fail_unless(linkoutput_ctr == 0);
  netif_set_down(&test_netif6);
  fail_unless(linkoutput_ctr == 0);

  /* test what is sent with link up + netif up */
  netif_set_link_up(&test_netif6);
  netif_set_up(&test_netif6);
  ip6_test_handle_timers(500);
  fail_unless(linkoutput_ctr == expected_ctr1);
  netif_set_down(&test_netif6);
  netif_set_link_down(&test_netif6);
  fail_unless(linkoutput_ctr == expected_ctr1);
  linkoutput_ctr = 0;

  netif_set_up(&test_netif6);
  netif_set_link_up(&test_netif6);
  ip6_test_handle_timers(500);
  fail_unless(linkoutput_ctr == expected_ctr2);
  netif_set_link_down(&test_netif6);
  netif_set_down(&test_netif6);
  fail_unless(linkoutput_ctr == expected_ctr2);
  linkoutput_ctr = 0;
}

START_TEST(test_ip6_ll_addr)
{
  LWIP_UNUSED_ARG(_i);

  linkoutput_ctr = 0;

  /* test without link-local address */
  test_ip6_ll_addr_iter(0, 0);

  /* test with link-local address */
  netif_create_ip6_linklocal_address(&test_netif6, 1);
  test_ip6_ll_addr_iter(3 + LWIP_IPV6_DUP_DETECT_ATTEMPTS + LWIP_IPV6_MLD, 3);
}
END_TEST

START_TEST(test_ip6_aton_ipv4mapped)
{
  int ret;
  ip_addr_t addr;
  ip6_addr_t addr6;
  const ip_addr_t addr_expected = IPADDR6_INIT_HOST(0, 0, 0xFFFF, 0xD4CC65D2);
  const char *full_ipv6_addr = "0:0:0:0:0:FFFF:D4CC:65D2";
  const char *shortened_ipv6_addr = "::FFFF:D4CC:65D2";
  const char *full_ipv4_mapped_addr = "0:0:0:0:0:FFFF:212.204.101.210";
  const char *shortened_ipv4_mapped_addr = "::FFFF:212.204.101.210";
  const char *bogus_ipv4_mapped_addr = "::FFFF:212.204.101.2101";
  LWIP_UNUSED_ARG(_i);

  /* check IPv6 representation */
  memset(&addr6, 0, sizeof(addr6));
  ret = ip6addr_aton(full_ipv6_addr, &addr6);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr6, &addr_expected, 16) == 0);
  memset(&addr, 0, sizeof(addr));
  ret = ipaddr_aton(full_ipv6_addr, &addr);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr, &addr_expected, 16) == 0);

  /* check shortened IPv6 representation */
  memset(&addr6, 0, sizeof(addr6));
  ret = ip6addr_aton(shortened_ipv6_addr, &addr6);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr6, &addr_expected, 16) == 0);
  memset(&addr, 0, sizeof(addr));
  ret = ipaddr_aton(shortened_ipv6_addr, &addr);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr, &addr_expected, 16) == 0);

  /* checked shortened mixed representation */
  memset(&addr6, 0, sizeof(addr6));
  ret = ip6addr_aton(shortened_ipv4_mapped_addr, &addr6);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr6, &addr_expected, 16) == 0);
  memset(&addr, 0, sizeof(addr));
  ret = ipaddr_aton(shortened_ipv4_mapped_addr, &addr);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr, &addr_expected, 16) == 0);

  /* checked mixed representation */
  memset(&addr6, 0, sizeof(addr6));
  ret = ip6addr_aton(full_ipv4_mapped_addr, &addr6);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr6, &addr_expected, 16) == 0);
  memset(&addr, 0, sizeof(addr));
  ret = ipaddr_aton(full_ipv4_mapped_addr, &addr);
  fail_unless(ret == 1);
  fail_unless(memcmp(&addr, &addr_expected, 16) == 0);

  /* checked bogus mixed representation */
  memset(&addr6, 0, sizeof(addr6));
  ret = ip6addr_aton(bogus_ipv4_mapped_addr, &addr6);
  fail_unless(ret == 0);
  memset(&addr, 0, sizeof(addr));
  ret = ipaddr_aton(bogus_ipv4_mapped_addr, &addr);
  fail_unless(ret == 0);
}
END_TEST

START_TEST(test_ip6_ntoa_ipv4mapped)
{
  const ip_addr_t addr = IPADDR6_INIT_HOST(0, 0, 0xFFFF, 0xD4CC65D2);
  char buf[128];
  char *str;
  LWIP_UNUSED_ARG(_i);

  str = ip6addr_ntoa_r(ip_2_ip6(&addr), buf, sizeof(buf));
  fail_unless(str == buf);
  fail_unless(!strcmp(str, "::FFFF:212.204.101.210"));
}
END_TEST

struct test_addr_and_str {
  ip_addr_t addr;
  const char *str;
};

START_TEST(test_ip6_ntoa)
{
  struct test_addr_and_str tests[] = {
    {IPADDR6_INIT_HOST(0xfe800000, 0x00000000, 0xb2a1a2ff, 0xfea3a4a5), "FE80::B2A1:A2FF:FEA3:A4A5"}, /* test shortened zeros */
    {IPADDR6_INIT_HOST(0xfe800000, 0xff000000, 0xb2a1a2ff, 0xfea3a4a5), "FE80:0:FF00:0:B2A1:A2FF:FEA3:A4A5"}, /* don't omit single zero blocks */
    {IPADDR6_INIT_HOST(0xfe800000, 0xff000000, 0xb2000000, 0x0000a4a5), "FE80:0:FF00:0:B200::A4A5"}, /* omit longest zero block */
  };
  char buf[128];
  char *str;
  size_t i;
  LWIP_UNUSED_ARG(_i);

  for (i = 0; i < LWIP_ARRAYSIZE(tests); i++) {
    str = ip6addr_ntoa_r(ip_2_ip6(&tests[i].addr), buf, sizeof(buf));
    fail_unless(str == buf);
    fail_unless(!strcmp(str, tests[i].str));
  }
}
END_TEST

START_TEST(test_ip6_lladdr)
{
  u8_t zeros[128];
  const u8_t test_mac_addr[6] = {0xb0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5};
  const u32_t expected_ip6_addr_1[4] = {PP_HTONL(0xfe800000), 0, PP_HTONL(0xb2a1a2ff), PP_HTONL(0xfea3a4a5)};
  const u32_t expected_ip6_addr_2[4] = {PP_HTONL(0xfe800000), 0, PP_HTONL(0x0000b0a1), PP_HTONL(0xa2a3a4a5)};
  LWIP_UNUSED_ARG(_i);
  memset(zeros, 0, sizeof(zeros));

  fail_unless(test_netif6.hwaddr_len == 6);
  fail_unless(!memcmp(test_netif6.hwaddr, zeros, 6));

  fail_unless(test_netif6.ip6_addr_state[0] == 0);
  fail_unless(!memcmp(netif_ip6_addr(&test_netif6, 0), zeros, sizeof(ip6_addr_t)));

  /* set specific mac addr */
  memcpy(test_netif6.hwaddr, test_mac_addr, 6);

  /* create link-local addr based on mac (EUI-48) */
  netif_create_ip6_linklocal_address(&test_netif6, 1);
  fail_unless(IP_IS_V6(&test_netif6.ip6_addr[0]));
  fail_unless(!memcmp(&netif_ip6_addr(&test_netif6, 0)->addr, expected_ip6_addr_1, 16));
#if LWIP_IPV6_SCOPES
  fail_unless(netif_ip6_addr(&test_netif6, 0)->zone == (test_netif6.num + 1));
#endif
  /* reset address */
  memset(&test_netif6.ip6_addr[0], 0, sizeof(ip6_addr_t));
  test_netif6.ip6_addr_state[0] = 0;

  /* create link-local addr based interface ID */
  netif_create_ip6_linklocal_address(&test_netif6, 0);
  fail_unless(IP_IS_V6(&test_netif6.ip6_addr[0]));
  fail_unless(!memcmp(&netif_ip6_addr(&test_netif6, 0)->addr, expected_ip6_addr_2, 16));
#if LWIP_IPV6_SCOPES
  fail_unless(netif_ip6_addr(&test_netif6, 0)->zone == (test_netif6.num + 1));
#endif
  /* reset address */
  memset(&test_netif6.ip6_addr[0], 0, sizeof(ip6_addr_t));
  test_netif6.ip6_addr_state[0] = 0;

  /* reset mac address */
  memset(&test_netif6.hwaddr, 0, sizeof(test_netif6.hwaddr));
}
END_TEST

static struct pbuf *cloned_pbuf = NULL;
static err_t clone_output(struct netif *netif, struct pbuf *p, const ip6_addr_t *addr) {
  LWIP_UNUSED_ARG(netif);
  LWIP_UNUSED_ARG(addr);
  cloned_pbuf = pbuf_clone(PBUF_RAW, PBUF_RAM, p);
  return ERR_OK;
}

/* Reproduces bug #58553 */
START_TEST(test_ip6_dest_unreachable_chained_pbuf)
{

  ip_addr_t my_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x1);
  ip_addr_t peer_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x4);
  /* Create chained pbuf with UDP data that will get destination unreachable */
  u8_t udp_hdr[] = {
    0x60, 0x00, 0x27, 0x03, 0x00, 0x2d, 0x11, 0x40,
    0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04,
    0x20, 0x01, 0x0d, 0xb8, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
    0x01, 0xff, 0x03, 0xff, 0x00, 0x2d, 0x00, 0x00,
  };
  struct pbuf *header = pbuf_alloc(PBUF_RAW, sizeof(udp_hdr), PBUF_ROM);
  u8_t udp_payload[] = "abcdefghijklmnopqrstuvwxyz0123456789";
  struct pbuf *data = pbuf_alloc(PBUF_RAW, sizeof(udp_payload), PBUF_ROM);
  u8_t *icmpptr;
  struct ip6_hdr *outhdr;
  struct icmp6_hdr *icmp6hdr;
  LWIP_UNUSED_ARG(_i);

  fail_unless(header);
  header->payload = udp_hdr;
  fail_unless(data);
  data->payload = udp_payload;
  pbuf_cat(header, data);
  data = NULL;

  /* Configure and enable local address */
  netif_set_up(&test_netif6);
  netif_ip6_addr_set(&test_netif6, 0, ip_2_ip6(&my_addr));
  netif_ip6_addr_set_state(&test_netif6, 0, IP6_ADDR_VALID);
  test_netif6.output_ip6 = clone_output;

  /* Process packet and send ICMPv6 reply for unreachable UDP port */
  ip6_input(header, &test_netif6);
  header = NULL;

  /* Verify ICMP reply packet contents */
  fail_unless(cloned_pbuf);
  fail_unless(cloned_pbuf->len == IP6_HLEN + ICMP6_HLEN + sizeof(udp_hdr) + sizeof(udp_payload));
  outhdr = (struct ip6_hdr*) cloned_pbuf->payload;
  fail_unless(ip6_addr_packed_eq(ip_2_ip6(&my_addr), &outhdr->src, IP6_NO_ZONE));
  fail_unless(ip6_addr_packed_eq(ip_2_ip6(&peer_addr), &outhdr->dest, IP6_NO_ZONE));
  icmpptr = &((u8_t*)cloned_pbuf->payload)[IP6_HLEN];
  icmp6hdr = (struct icmp6_hdr*) icmpptr;
  fail_unless(icmp6hdr->type == ICMP6_TYPE_DUR);
  fail_unless(icmp6hdr->code == ICMP6_DUR_PORT);
  fail_unless(icmp6hdr->data == lwip_htonl(0));
  icmpptr += ICMP6_HLEN;
  fail_unless(memcmp(icmpptr, udp_hdr, sizeof(udp_hdr)) == 0, "mismatch in copied ip6/udp header");
  icmpptr += sizeof(udp_hdr);
  fail_unless(memcmp(icmpptr, udp_payload, sizeof(udp_payload)) == 0, "mismatch in copied udp payload");
  pbuf_free(cloned_pbuf);
}
END_TEST

/* Reproduces bug #57374 */
START_TEST(test_ip6_frag_pbuf_len_assert)
{
  ip_addr_t my_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x1);
  ip_addr_t peer_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x4);
  struct pbuf *payload, *hdr;
  err_t err;
  int i;
  LWIP_UNUSED_ARG(_i);

  /* Configure and enable local address */
  test_netif6.mtu = 1500;
  netif_set_up(&test_netif6);
  netif_ip6_addr_set(&test_netif6, 0, ip_2_ip6(&my_addr));
  netif_ip6_addr_set_state(&test_netif6, 0, IP6_ADDR_VALID);

  /* Create packet with lots of small pbufs around mtu limit */
  payload = pbuf_alloc(PBUF_RAW, 1400, PBUF_POOL);
  fail_unless(payload != NULL);
  for (i = 0; i < 16; i++) {
    struct pbuf *p = pbuf_alloc(PBUF_RAW, 32, PBUF_RAM);
    fail_unless(p != NULL);
    pbuf_cat(payload, p);
  }
  /* Prefix with header like UDP would */
  hdr = pbuf_alloc(PBUF_IP, 8, PBUF_RAM);
  fail_unless(hdr != NULL);
  pbuf_chain(hdr, payload);

  /* Send it and don't crash while fragmenting */
  err = ip6_output_if_src(hdr, ip_2_ip6(&my_addr), ip_2_ip6(&peer_addr), 15, 0, IP_PROTO_UDP, &test_netif6);
  fail_unless(err == ERR_OK);

  pbuf_free(hdr);
  pbuf_free(payload);
}
END_TEST

static err_t direct_output(struct netif *netif, struct pbuf *p, const ip6_addr_t *addr) {
  LWIP_UNUSED_ARG(addr);
  return netif->linkoutput(netif, p);
}

START_TEST(test_ip6_frag)
{
  ip_addr_t my_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x1);
  ip_addr_t peer_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x4);
  struct pbuf *data;
  err_t err;
  LWIP_UNUSED_ARG(_i);

  /* Configure and enable local address */
  test_netif6.mtu = 1500;
  netif_set_up(&test_netif6);
  netif_ip6_addr_set(&test_netif6, 0, ip_2_ip6(&my_addr));
  netif_ip6_addr_set_state(&test_netif6, 0, IP6_ADDR_VALID);
  test_netif6.output_ip6 = direct_output;
  /* Reset counters after multicast traffic */
  linkoutput_ctr = 0;
  linkoutput_byte_ctr = 0;

  /* Verify that 8000 byte payload is split into six packets */
  data = pbuf_alloc(PBUF_IP, 8000, PBUF_RAM);
  fail_unless(data != NULL);
  err = ip6_output_if_src(data, ip_2_ip6(&my_addr), ip_2_ip6(&peer_addr),
                          15, 0, IP_PROTO_UDP, &test_netif6);
  fail_unless(err == ERR_OK);
  fail_unless(linkoutput_ctr == 6);
  fail_unless(linkoutput_byte_ctr == (8000 + (6 * (IP6_HLEN + IP6_FRAG_HLEN))));
  pbuf_free(data);
}
END_TEST

static void test_ip6_reass_helper(u32_t ip_id, const u16_t *segments, size_t num_segs, u16_t seglen)
{
  ip_addr_t my_addr = IPADDR6_INIT_HOST(0x20010db8, 0x0, 0x0, 0x1);
  size_t i;

  memset(&lwip_stats.mib2, 0, sizeof(lwip_stats.mib2));
  memset(&lwip_stats.ip6_frag, 0, sizeof(lwip_stats.ip6_frag));

  netif_set_up(&test_netif6);
  netif_ip6_addr_set(&test_netif6, 0, ip_2_ip6(&my_addr));
  netif_ip6_addr_set_state(&test_netif6, 0, IP6_ADDR_VALID);

  for (i = 0; i < num_segs; i++) {
    u16_t seg = segments[i];
    int last = seg + 1U == num_segs;
    create_ip6_input_fragment(ip_id, seg * seglen, seglen, last, IP6_NEXTH_UDP);
    fail_unless(lwip_stats.ip6_frag.recv == i + 1);
    fail_unless(lwip_stats.ip6_frag.err == 0);
    fail_unless(lwip_stats.ip6_frag.memerr == 0);
    fail_unless(lwip_stats.ip6_frag.drop == 0);
    if (i + 1 == num_segs) {
      fail_unless(lwip_stats.mib2.ip6reasmoks == 1);
    }
    else {
      fail_unless(lwip_stats.mib2.ip6reasmoks == 0);
    }
  }
}

START_TEST(test_ip6_reass)
{
#define NUM_SEGS 9
  const u16_t t1[NUM_SEGS] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };
  const u16_t t2[NUM_SEGS] = { 8, 0, 1, 2, 3, 4, 7, 6, 5 };
  const u16_t t3[NUM_SEGS] = { 1, 2, 3, 4, 5, 6, 7, 8, 0 };
  const u16_t t4[NUM_SEGS] = { 8, 2, 4, 6, 7, 5, 3, 1, 0 };
  LWIP_UNUSED_ARG(_i);

  test_ip6_reass_helper(128, t1, NUM_SEGS, 200);
  test_ip6_reass_helper(129, t2, NUM_SEGS, 208);
  test_ip6_reass_helper(130, t3, NUM_SEGS, 8);
  test_ip6_reass_helper(130, t4, NUM_SEGS, 1448);
}

/** Create the suite including all tests for this module */
Suite *
ip6_suite(void)
{
  testfunc tests[] = {
    TESTFUNC(test_ip6_ll_addr),
    TESTFUNC(test_ip6_aton_ipv4mapped),
    TESTFUNC(test_ip6_ntoa_ipv4mapped),
    TESTFUNC(test_ip6_ntoa),
    TESTFUNC(test_ip6_lladdr),
    TESTFUNC(test_ip6_dest_unreachable_chained_pbuf),
    TESTFUNC(test_ip6_frag_pbuf_len_assert),
    TESTFUNC(test_ip6_frag),
    TESTFUNC(test_ip6_reass)
  };
  return create_suite("IPv6", tests, sizeof(tests)/sizeof(testfunc), ip6_setup, ip6_teardown);
}

#else /* LWIP_IPV6 */

/* allow to build the unit tests without IPv6 support */
START_TEST(test_ip6_dummy)
{
  LWIP_UNUSED_ARG(_i);
}
END_TEST

Suite *
ip6_suite(void)
{
  testfunc tests[] = {
    TESTFUNC(test_ip6_dummy),
  };
  return create_suite("IPv6", tests, sizeof(tests)/sizeof(testfunc), NULL, NULL);
}
#endif /* LWIP_IPV6 */