static void test_ipv6_netif_find_best_src_addr__success(void)
{
ng_ipv6_addr_t ll_addr1 = NG_IPV6_ADDR_UNSPECIFIED;
ng_ipv6_addr_t ll_addr2 = NG_IPV6_ADDR_UNSPECIFIED;
ng_ipv6_addr_t mc_addr = NG_IPV6_ADDR_ALL_NODES_LINK_LOCAL;
ng_ipv6_addr_t *out = NULL;
ll_addr1.u8[15] = 1;
ng_ipv6_addr_set_link_local_prefix(&ll_addr1);
ll_addr2.u8[15] = 2;
ng_ipv6_addr_set_link_local_prefix(&ll_addr2);
TEST_ASSERT_EQUAL_INT(126, ng_ipv6_addr_match_prefix(&ll_addr2, &ll_addr1));
test_ipv6_netif_add__success(); /* adds DEFAULT_TEST_NETIF as interface */
TEST_ASSERT_EQUAL_INT(0, ng_ipv6_netif_add_addr(DEFAULT_TEST_NETIF, &mc_addr,
DEFAULT_TEST_PREFIX_LEN, false));
TEST_ASSERT_EQUAL_INT(0, ng_ipv6_netif_add_addr(DEFAULT_TEST_NETIF, &ll_addr1,
DEFAULT_TEST_PREFIX_LEN, false));
TEST_ASSERT_NOT_NULL((out = ng_ipv6_netif_find_best_src_addr(DEFAULT_TEST_NETIF, &ll_addr2)));
TEST_ASSERT(out != &ll_addr1);
TEST_ASSERT(out != &ll_addr2);
TEST_ASSERT_EQUAL_INT(true, ng_ipv6_addr_equal(out, &ll_addr1));
}
static void test_ipv6_netif_find_best_src_addr__multicast_input(void)
{
ipv6_addr_t mc_addr = IPV6_ADDR_ALL_ROUTERS_LINK_LOCAL;
ipv6_addr_t *out = NULL;
/* Adds DEFAULT_TEST_NETIF as interface and to it fe80::1, fe80::2 and ff02::1 */
test_ipv6_netif_find_best_src_addr__success();
TEST_ASSERT_NOT_NULL((out = ng_ipv6_netif_find_best_src_addr(DEFAULT_TEST_NETIF, &mc_addr)));
TEST_ASSERT_EQUAL_INT(false, ipv6_addr_equal(&mc_addr, out));
TEST_ASSERT_EQUAL_INT(false, ipv6_addr_is_unspecified(out));
}
static void test_ipv6_netif_find_best_src_addr__other_subnet(void)
{
ipv6_addr_t addr1 = DEFAULT_TEST_IPV6_ADDR;
ipv6_addr_t addr2 = OTHER_TEST_IPV6_ADDR;
ipv6_addr_t *out = NULL;
test_ipv6_netif_add__success(); /* adds DEFAULT_TEST_NETIF as interface */
TEST_ASSERT_NOT_NULL(ng_ipv6_netif_add_addr(DEFAULT_TEST_NETIF, &addr1, DEFAULT_TEST_PREFIX_LEN,
0));
TEST_ASSERT_NOT_NULL((out = ng_ipv6_netif_find_best_src_addr(DEFAULT_TEST_NETIF, &addr2)));
TEST_ASSERT(out != &addr1);
TEST_ASSERT_EQUAL_INT(true, ipv6_addr_equal(out, &addr1));
}
static void test_ipv6_netif_find_best_src_addr__no_unicast(void)
{
ipv6_addr_t ll_addr1 = IPV6_ADDR_UNSPECIFIED;
ipv6_addr_t ll_addr2 = IPV6_ADDR_UNSPECIFIED;
ipv6_addr_t mc_addr = IPV6_ADDR_ALL_NODES_LINK_LOCAL;
ll_addr1.u8[15] = 1;
ipv6_addr_set_link_local_prefix(&ll_addr1);
ll_addr2.u8[15] = 2;
ipv6_addr_set_link_local_prefix(&ll_addr2);
TEST_ASSERT_EQUAL_INT(126, ipv6_addr_match_prefix(&ll_addr2, &ll_addr1));
test_ipv6_netif_add__success(); /* adds DEFAULT_TEST_NETIF as interface */
TEST_ASSERT_NOT_NULL(ng_ipv6_netif_add_addr(DEFAULT_TEST_NETIF, &mc_addr, DEFAULT_TEST_PREFIX_LEN,
0));
TEST_ASSERT_NOT_NULL(ng_ipv6_netif_add_addr(DEFAULT_TEST_NETIF, &ll_addr1, DEFAULT_TEST_PREFIX_LEN,
NG_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST));
TEST_ASSERT_NULL(ng_ipv6_netif_find_best_src_addr(DEFAULT_TEST_NETIF, &ll_addr2));
}
static void _send_nbr_sol(kernel_pid_t iface, ng_ipv6_addr_t *tgt,
ng_ipv6_addr_t *dst)
{
ng_pktsnip_t *hdr, *pkt = NULL;
ng_ipv6_addr_t *src = NULL;
size_t src_len = 0;
DEBUG("ndp: send neighbor solicitation (iface: %" PRIkernel_pid ", tgt: %s, ",
iface, ng_ipv6_addr_to_str(addr_str, tgt, sizeof(addr_str)));
DEBUG("dst: %s)\n", ng_ipv6_addr_to_str(addr_str, dst, sizeof(addr_str)));
/* check if there is a fitting source address to target */
if ((src = ng_ipv6_netif_find_best_src_addr(iface, tgt)) != NULL) {
uint8_t l2src[8];
uint16_t l2src_len;
src_len = sizeof(ng_ipv6_addr_t);
l2src_len = _get_l2src(l2src, sizeof(l2src), iface);
if (l2src_len > 0) {
/* add source address link-layer address option */
pkt = ng_ndp_opt_sl2a_build(l2src, l2src_len, NULL);
if (pkt == NULL) {
DEBUG("ndp: error allocating Source Link-layer address option.\n");
ng_pktbuf_release(pkt);
return;
}
}
}
hdr = ng_ndp_nbr_sol_build(tgt, pkt);
if (hdr == NULL) {
DEBUG("ndp: error allocating Neighbor solicitation.\n");
ng_pktbuf_release(pkt);
return;
}
pkt = hdr;
hdr = ng_ipv6_hdr_build(pkt, (uint8_t *)src, src_len, (uint8_t *)dst,
sizeof(ng_ipv6_addr_t));
if (hdr == NULL) {
DEBUG("ndp: error allocating IPv6 header.\n");
ng_pktbuf_release(pkt);
return;
}
((ng_ipv6_hdr_t *)hdr->data)->hl = 255;
pkt = hdr;
/* add netif header for send interface specification */
hdr = ng_netif_hdr_build(NULL, 0, NULL, 0);
if (hdr == NULL) {
DEBUG("ndp: error allocating netif header.\n");
return;
}
((ng_netif_hdr_t *)hdr->data)->if_pid = iface;
LL_PREPEND(pkt, hdr);
ng_netapi_send(ng_ipv6_pid, pkt);
}
static int _fill_ipv6_hdr(kernel_pid_t iface, ng_pktsnip_t *ipv6,
ng_pktsnip_t *payload)
{
int res;
ng_ipv6_hdr_t *hdr = ipv6->data;
hdr->len = byteorder_htons(ng_pkt_len(payload));
DEBUG("ipv6: set payload length to %zu (network byteorder %04" PRIx16 ")\n",
ng_pkt_len(payload), hdr->len.u16);
/* check if e.g. extension header was not already marked */
if (hdr->nh == NG_PROTNUM_RESERVED) {
hdr->nh = ng_nettype_to_protnum(payload->type);
/* if still reserved: mark no next header */
if (hdr->nh == NG_PROTNUM_RESERVED) {
hdr->nh = NG_PROTNUM_IPV6_NONXT;
}
}
DEBUG("ipv6: set next header to %" PRIu8 "\n", hdr->nh);
if (hdr->hl == 0) {
hdr->hl = ng_ipv6_netif_get(iface)->cur_hl;
}
if (ng_ipv6_addr_is_unspecified(&hdr->src)) {
ng_ipv6_addr_t *src = ng_ipv6_netif_find_best_src_addr(iface, &hdr->dst);
if (src != NULL) {
DEBUG("ipv6: set packet source to %s\n",
ng_ipv6_addr_to_str(addr_str, src, sizeof(addr_str)));
memcpy(&hdr->src, src, sizeof(ng_ipv6_addr_t));
}
/* Otherwise leave unspecified */
}
DEBUG("ipv6: calculate checksum for upper header.\n");
#if NG_NETIF_NUMOF > 1
if (payload->users > 1) {
ng_pktsnip_t *ptr = ipv6;
/* We deal with multiple interfaces here (multicast) => possible
* different source addresses => duplication of payload needed */
while (ptr != payload->next) {
ng_pktsnip_t *old = ptr->next;
/* duplicate everything including payload */
ptr->next = ng_pktbuf_start_write(ptr->next);
if (ptr->next == NULL) {
DEBUG("ipv6: unable to get write access to payload, drop it\n");
return -ENOBUFS;
}
ptr = old;
}
}
#endif /* NG_NETIF_NUMOF */
if ((res = ng_netreg_calc_csum(payload, ipv6)) < 0) {
if (res != -ENOENT) { /* if there is no checksum we are okay */
DEBUG("ipv6: checksum calculation failed.\n");
return res;
}
}
return 0;
}
