static void _send_to_iface(kernel_pid_t iface, gnrc_pktsnip_t *pkt)
{
((gnrc_netif_hdr_t *)pkt->data)->if_pid = iface;
gnrc_ipv6_netif_t *if_entry = gnrc_ipv6_netif_get(iface);
assert(if_entry != NULL);
if (gnrc_pkt_len(pkt->next) > if_entry->mtu) {
DEBUG("ipv6: packet too big\n");
gnrc_pktbuf_release(pkt);
return;
}
#ifdef MODULE_NETSTATS_IPV6
if_entry->stats.tx_success++;
if_entry->stats.tx_bytes += gnrc_pkt_len(pkt->next);
#endif
#ifdef MODULE_GNRC_SIXLOWPAN
if (if_entry->flags & GNRC_IPV6_NETIF_FLAGS_SIXLOWPAN) {
DEBUG("ipv6: send to 6LoWPAN instead\n");
if (!gnrc_netapi_dispatch_send(GNRC_NETTYPE_SIXLOWPAN, GNRC_NETREG_DEMUX_CTX_ALL, pkt)) {
DEBUG("ipv6: no 6LoWPAN thread found");
gnrc_pktbuf_release(pkt);
}
return;
}
#endif
if (gnrc_netapi_send(iface, pkt) < 1) {
DEBUG("ipv6: unable to send packet\n");
gnrc_pktbuf_release(pkt);
}
}
static int _fill_ipv6_hdr(kernel_pid_t iface, gnrc_pktsnip_t *ipv6,
gnrc_pktsnip_t *payload)
{
int res;
ipv6_hdr_t *hdr = ipv6->data;
hdr->len = byteorder_htons(gnrc_pkt_len(payload));
DEBUG("ipv6: set payload length to %u (network byteorder %04" PRIx16 ")\n",
(unsigned) gnrc_pkt_len(payload), hdr->len.u16);
/* check if e.g. extension header was not already marked */
if (hdr->nh == PROTNUM_RESERVED) {
hdr->nh = gnrc_nettype_to_protnum(payload->type);
/* if still reserved: mark no next header */
if (hdr->nh == PROTNUM_RESERVED) {
hdr->nh = PROTNUM_IPV6_NONXT;
}
}
DEBUG("ipv6: set next header to %u\n", hdr->nh);
if (hdr->hl == 0) {
if (iface == KERNEL_PID_UNDEF) {
hdr->hl = GNRC_IPV6_NETIF_DEFAULT_HL;
}
else {
hdr->hl = gnrc_ipv6_netif_get(iface)->cur_hl;
}
}
if (ipv6_addr_is_unspecified(&hdr->src)) {
if (ipv6_addr_is_loopback(&hdr->dst)) {
ipv6_addr_set_loopback(&hdr->src);
}
else {
ipv6_addr_t *src = gnrc_ipv6_netif_find_best_src_addr(iface, &hdr->dst, false);
if (src != NULL) {
DEBUG("ipv6: set packet source to %s\n",
ipv6_addr_to_str(addr_str, src, sizeof(addr_str)));
memcpy(&hdr->src, src, sizeof(ipv6_addr_t));
}
/* Otherwise leave unspecified */
}
}
DEBUG("ipv6: calculate checksum for upper header.\n");
if ((res = gnrc_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;
}
static void test_pkt_len__2_elem(void)
{
gnrc_pktsnip_t snip1 = _INIT_ELEM_STATIC_DATA(TEST_STRING8, NULL);
gnrc_pktsnip_t snip2 = _INIT_ELEM_STATIC_DATA(TEST_STRING12, &snip1);
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8) + sizeof(TEST_STRING12),
gnrc_pkt_len(&snip2));
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8), gnrc_pkt_len(&snip1));
}
static void test_pkt_len__2_elem__overflow(void)
{
gnrc_pktsnip_t snip1 = _INIT_ELEM_STATIC_DATA(TEST_STRING8, NULL);
gnrc_pktsnip_t snip2 = _INIT_ELEM(SIZE_MAX, NULL, &snip1);
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8) - 1, gnrc_pkt_len(&snip2));
/* size should overflow */
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8), gnrc_pkt_len(&snip1));
}
static int _send(gnrc_netdev_t *netdev, gnrc_pktsnip_t *pkt)
{
xbee_t *dev = (xbee_t *)netdev;
size_t size;
size_t pos;
gnrc_netif_hdr_t *hdr;
gnrc_pktsnip_t *payload;
/* check device descriptor and packet */
if (pkt == NULL) {
return -ENOMSG;
}
if (dev == NULL) {
gnrc_pktbuf_release(pkt);
return -ENODEV;
}
/* figure out the size of the payload to send */
size = gnrc_pkt_len(pkt->next);
if (size > XBEE_MAX_PAYLOAD_LENGTH) {
DEBUG("xbee: Error sending data, payload length exceeds limit\n");
gnrc_pktbuf_release(pkt);
return -EOVERFLOW;
}
/* get netif header check address length and flags */
hdr = (gnrc_netif_hdr_t *)pkt->data;
if (!((hdr->dst_l2addr_len == 2) || (hdr->dst_l2addr_len == 8) ||
_is_broadcast(hdr))) {
gnrc_pktbuf_release(pkt);
return -ENOMSG;
}
/* acquire TX lock */
mutex_lock(&(dev->tx_lock));
/* put together the API frame */
dev->tx_buf[0] = API_START_DELIMITER;
dev->tx_buf[4] = 0; /* set to zero to disable response frame */
/* set size, API id and address field depending on dst address length */
if (_is_broadcast(hdr)) {
dev->tx_buf[1] = (uint8_t)((size + 5) >> 8);
dev->tx_buf[2] = (uint8_t)(size + 5);
dev->tx_buf[3] = API_ID_TX_SHORT_ADDR;
dev->tx_buf[4] = 0xff;
dev->tx_buf[5] = 0xff;
}
if (hdr->dst_l2addr_len == 2) {
dev->tx_buf[1] = (uint8_t)((size + 5) >> 8);
dev->tx_buf[2] = (uint8_t)(size + 5);
dev->tx_buf[3] = API_ID_TX_SHORT_ADDR;
memcpy(dev->tx_buf + 5, gnrc_netif_hdr_get_dst_addr(hdr), 2);
pos = 7;
}
/**
* @brief Make a raw dump of the given packet contents
*/
void dump_pkt(gnrc_pktsnip_t *pkt)
{
gnrc_pktsnip_t *snip = pkt;
printf("rftest-rx --- len 0x%02x lqi 0x%02x rx_time 0x%08" PRIx64 "\n\n",
gnrc_pkt_len(pkt), 0, xtimer_now64());
while (snip) {
for (size_t i = 0; i < snip->size; i++) {
printf("0x%02x ", ((uint8_t *)(snip->data))[i]);
}
snip = snip->next;
}
puts("\n");
gnrc_pktbuf_release(pkt);
}
void gnrc_sixlowpan_frag_send(kernel_pid_t pid, gnrc_pktsnip_t *pkt,
size_t datagram_size)
{
gnrc_sixlowpan_netif_t *iface = gnrc_sixlowpan_netif_get(pid);
uint16_t offset = 0, res;
/* payload_len: actual size of the packet vs
* datagram_size: size of the uncompressed IPv6 packet */
size_t payload_len = gnrc_pkt_len(pkt->next);
#if defined(DEVELHELP) && defined(ENABLE_DEBUG)
if (iface == NULL) {
DEBUG("6lo frag: iface == NULL, expect segmentation fault.\n");
gnrc_pktbuf_release(pkt);
return;
}
#endif
if ((res = _send_1st_fragment(iface, pkt, payload_len, datagram_size)) == 0) {
/* error sending first fragment */
DEBUG("6lo frag: error sending 1st fragment\n");
gnrc_pktbuf_release(pkt);
return;
}
offset += res;
thread_yield();
/* (offset + (datagram_size - payload_len) < datagram_size) simplified */
while (offset < payload_len) {
if ((res = _send_nth_fragment(iface, pkt, payload_len, datagram_size,
offset)) == 0) {
/* error sending subsequent fragment */
DEBUG("6lo frag: error sending subsequent fragment (offset = %" PRIu16
")\n", offset);
gnrc_pktbuf_release(pkt);
return;
}
offset += res;
thread_yield();
}
/* remove original packet from packet buffer */
gnrc_pktbuf_release(pkt);
_tag++;
}
static void _receive(gnrc_pktsnip_t *pkt)
{
kernel_pid_t iface = KERNEL_PID_UNDEF;
gnrc_pktsnip_t *ipv6, *netif, *first_ext;
ipv6_hdr_t *hdr;
assert(pkt != NULL);
netif = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_NETIF);
if (netif != NULL) {
iface = ((gnrc_netif_hdr_t *)netif->data)->if_pid;
#ifdef MODULE_NETSTATS_IPV6
assert(iface);
netstats_t *stats = gnrc_ipv6_netif_get_stats(iface);
stats->rx_count++;
stats->rx_bytes += (gnrc_pkt_len(pkt) - netif->size);
#endif
}
first_ext = pkt;
for (ipv6 = pkt; ipv6 != NULL; ipv6 = ipv6->next) { /* find IPv6 header if already marked */
if ((ipv6->type == GNRC_NETTYPE_IPV6) && (ipv6->size == sizeof(ipv6_hdr_t)) &&
(ipv6_hdr_is(ipv6->data))) {
break;
}
first_ext = ipv6;
}
if (ipv6 == NULL) {
if (!ipv6_hdr_is(pkt->data)) {
DEBUG("ipv6: Received packet was not IPv6, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#ifdef MODULE_GNRC_IPV6_WHITELIST
if (!gnrc_ipv6_whitelisted(&((ipv6_hdr_t *)(pkt->data))->src)) {
DEBUG("ipv6: Source address not whitelisted, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#endif
#ifdef MODULE_GNRC_IPV6_BLACKLIST
if (gnrc_ipv6_blacklisted(&((ipv6_hdr_t *)(pkt->data))->src)) {
DEBUG("ipv6: Source address blacklisted, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#endif
/* seize ipv6 as a temporary variable */
ipv6 = gnrc_pktbuf_start_write(pkt);
if (ipv6 == NULL) {
DEBUG("ipv6: unable to get write access to packet, drop it\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = ipv6; /* reset pkt from temporary variable */
ipv6 = gnrc_pktbuf_mark(pkt, sizeof(ipv6_hdr_t), GNRC_NETTYPE_IPV6);
first_ext = pkt;
pkt->type = GNRC_NETTYPE_UNDEF; /* snip is no longer IPv6 */
if (ipv6 == NULL) {
DEBUG("ipv6: error marking IPv6 header, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
}
#ifdef MODULE_GNRC_IPV6_WHITELIST
else if (!gnrc_ipv6_whitelisted(&((ipv6_hdr_t *)(ipv6->data))->src)) {
/* if ipv6 header already marked*/
DEBUG("ipv6: Source address not whitelisted, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#endif
#ifdef MODULE_GNRC_IPV6_BLACKLIST
else if (gnrc_ipv6_blacklisted(&((ipv6_hdr_t *)(ipv6->data))->src)) {
/* if ipv6 header already marked*/
DEBUG("ipv6: Source address blacklisted, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#endif
/* extract header */
hdr = (ipv6_hdr_t *)ipv6->data;
/* if available, remove any padding that was added by lower layers
* to fulfill their minimum size requirements (e.g. ethernet) */
if (byteorder_ntohs(hdr->len) < pkt->size) {
gnrc_pktbuf_realloc_data(pkt, byteorder_ntohs(hdr->len));
}
else if (byteorder_ntohs(hdr->len) >
(gnrc_pkt_len_upto(pkt, GNRC_NETTYPE_IPV6) - sizeof(ipv6_hdr_t))) {
DEBUG("ipv6: invalid payload length: %d, actual: %d, dropping packet\n",
(int) byteorder_ntohs(hdr->len),
(int) (gnrc_pkt_len_upto(pkt, GNRC_NETTYPE_IPV6) - sizeof(ipv6_hdr_t)));
gnrc_pktbuf_release(pkt);
return;
}
DEBUG("ipv6: Received (src = %s, ",
ipv6_addr_to_str(addr_str, &(hdr->src), sizeof(addr_str)));
DEBUG("dst = %s, next header = %u, length = %" PRIu16 ")\n",
ipv6_addr_to_str(addr_str, &(hdr->dst), sizeof(addr_str)),
hdr->nh, byteorder_ntohs(hdr->len));
if (_pkt_not_for_me(&iface, hdr)) { /* if packet is not for me */
DEBUG("ipv6: packet destination not this host\n");
#ifdef MODULE_GNRC_IPV6_ROUTER /* only routers redirect */
/* redirect to next hop */
DEBUG("ipv6: decrement hop limit to %u\n", (uint8_t) (hdr->hl - 1));
/* RFC 4291, section 2.5.6 states: "Routers must not forward any
* packets with Link-Local source or destination addresses to other
* links."
*/
if ((ipv6_addr_is_link_local(&(hdr->src))) || (ipv6_addr_is_link_local(&(hdr->dst)))) {
DEBUG("ipv6: do not forward packets with link-local source or"
" destination address\n");
gnrc_pktbuf_release(pkt);
return;
}
/* TODO: check if receiving interface is router */
else if (--(hdr->hl) > 0) { /* drop packets that *reach* Hop Limit 0 */
gnrc_pktsnip_t *reversed_pkt = NULL, *ptr = pkt;
DEBUG("ipv6: forward packet to next hop\n");
/* pkt might not be writable yet, if header was given above */
ipv6 = gnrc_pktbuf_start_write(ipv6);
if (ipv6 == NULL) {
DEBUG("ipv6: unable to get write access to packet: dropping it\n");
gnrc_pktbuf_release(pkt);
return;
}
/* remove L2 headers around IPV6 */
netif = gnrc_pktsnip_search_type(pkt, GNRC_NETTYPE_NETIF);
if (netif != NULL) {
gnrc_pktbuf_remove_snip(pkt, netif);
}
/* reverse packet snip list order */
while (ptr != NULL) {
gnrc_pktsnip_t *next;
ptr = gnrc_pktbuf_start_write(ptr); /* duplicate if not already done */
if (ptr == NULL) {
DEBUG("ipv6: unable to get write access to packet: dropping it\n");
gnrc_pktbuf_release(reversed_pkt);
gnrc_pktbuf_release(pkt);
return;
}
next = ptr->next;
ptr->next = reversed_pkt;
reversed_pkt = ptr;
ptr = next;
}
_send(reversed_pkt, false);
return;
}
else {
DEBUG("ipv6: hop limit reached 0: drop packet\n");
gnrc_pktbuf_release(pkt);
return;
}
#else /* MODULE_GNRC_IPV6_ROUTER */
DEBUG("ipv6: dropping packet\n");
/* non rounting hosts just drop the packet */
gnrc_pktbuf_release(pkt);
return;
#endif /* MODULE_GNRC_IPV6_ROUTER */
}
/* IPv6 internal demuxing (ICMPv6, Extension headers etc.) */
gnrc_ipv6_demux(iface, first_ext, pkt, hdr->nh);
}
static void _send(gnrc_pktsnip_t *pkt, bool prep_hdr)
{
kernel_pid_t iface = KERNEL_PID_UNDEF;
gnrc_pktsnip_t *ipv6, *payload;
ipv6_addr_t *tmp;
ipv6_hdr_t *hdr;
/* get IPv6 snip and (if present) generic interface header */
if (pkt->type == GNRC_NETTYPE_NETIF) {
/* If there is already a netif header (routing protocols and
* neighbor discovery might add them to preset sending interface) */
iface = ((gnrc_netif_hdr_t *)pkt->data)->if_pid;
/* seize payload as temporary variable */
ipv6 = gnrc_pktbuf_start_write(pkt); /* write protect for later removal
* in _send_unicast() */
if (ipv6 == NULL) {
DEBUG("ipv6: unable to get write access to netif header, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = ipv6; /* Reset pkt from temporary variable */
ipv6 = pkt->next;
}
else {
ipv6 = pkt;
}
/* seize payload as temporary variable */
payload = gnrc_pktbuf_start_write(ipv6);
if (payload == NULL) {
DEBUG("ipv6: unable to get write access to IPv6 header, dropping packet\n");
gnrc_pktbuf_release(pkt);
return;
}
if (ipv6 != pkt) { /* in case packet has netif header */
pkt->next = payload;/* pkt is already write-protected so we can do that */
}
else {
pkt = payload; /* pkt is the IPv6 header so we just write-protected it */
}
ipv6 = payload; /* Reset ipv6 from temporary variable */
hdr = ipv6->data;
payload = ipv6->next;
if (ipv6_addr_is_multicast(&hdr->dst)) {
_send_multicast(iface, pkt, ipv6, payload, prep_hdr);
}
else if ((ipv6_addr_is_loopback(&hdr->dst)) || /* dst is loopback address */
((iface == KERNEL_PID_UNDEF) && /* or dst registered to any local interface */
((iface = gnrc_ipv6_netif_find_by_addr(&tmp, &hdr->dst)) != KERNEL_PID_UNDEF)) ||
((iface != KERNEL_PID_UNDEF) && /* or dst registered to given interface */
(gnrc_ipv6_netif_find_addr(iface, &hdr->dst) != NULL))) {
uint8_t *rcv_data;
gnrc_pktsnip_t *ptr = ipv6, *rcv_pkt;
if (prep_hdr) {
if (_fill_ipv6_hdr(iface, ipv6, payload) < 0) {
/* error on filling up header */
gnrc_pktbuf_release(pkt);
return;
}
}
rcv_pkt = gnrc_pktbuf_add(NULL, NULL, gnrc_pkt_len(ipv6), GNRC_NETTYPE_IPV6);
if (rcv_pkt == NULL) {
DEBUG("ipv6: error on generating loopback packet\n");
gnrc_pktbuf_release(pkt);
return;
}
rcv_data = rcv_pkt->data;
/* "reverse" packet (by making it one snip as if received from NIC) */
while (ptr != NULL) {
memcpy(rcv_data, ptr->data, ptr->size);
rcv_data += ptr->size;
ptr = ptr->next;
}
gnrc_pktbuf_release(pkt);
DEBUG("ipv6: packet is addressed to myself => loopback\n");
if (gnrc_netapi_receive(gnrc_ipv6_pid, rcv_pkt) < 1) {
DEBUG("ipv6: unable to deliver packet\n");
gnrc_pktbuf_release(rcv_pkt);
}
}
else {
uint8_t l2addr_len = GNRC_IPV6_NC_L2_ADDR_MAX;
uint8_t l2addr[l2addr_len];
iface = _next_hop_l2addr(l2addr, &l2addr_len, iface, &hdr->dst, pkt);
if (iface == KERNEL_PID_UNDEF) {
DEBUG("ipv6: error determining next hop's link layer address\n");
gnrc_pktbuf_release(pkt);
return;
}
if (prep_hdr) {
if (_fill_ipv6_hdr(iface, ipv6, payload) < 0) {
/* error on filling up header */
gnrc_pktbuf_release(pkt);
return;
}
}
_send_unicast(iface, l2addr, l2addr_len, pkt);
}
}
static void test_pkt_len__1_elem__size_data(void)
{
gnrc_pktsnip_t snip = _INIT_ELEM_STATIC_DATA(TEST_STRING8, NULL);
TEST_ASSERT_EQUAL_INT(sizeof(TEST_STRING8), gnrc_pkt_len(&snip));
}
static void test_pkt_len__1_elem__size_0(void)
{
gnrc_pktsnip_t snip = _INIT_ELEM(0, NULL, NULL);
TEST_ASSERT_EQUAL_INT(0, gnrc_pkt_len(&snip));
}
static void test_pkt_len__NULL(void)
{
TEST_ASSERT_EQUAL_INT(0, gnrc_pkt_len(NULL));
}
void gnrc_sixlowpan_frag_send(gnrc_pktsnip_t *pkt, void *ctx, unsigned page)
{
assert(ctx != NULL);
gnrc_sixlowpan_msg_frag_t *fragment_msg = ctx;
gnrc_netif_t *iface = gnrc_netif_get_by_pid(fragment_msg->pid);
uint16_t res;
/* payload_len: actual size of the packet vs
* datagram_size: size of the uncompressed IPv6 packet */
size_t payload_len = gnrc_pkt_len(fragment_msg->pkt->next);
msg_t msg;
assert((fragment_msg->pkt == pkt) || (pkt == NULL));
(void)page;
(void)pkt;
#if defined(DEVELHELP) && ENABLE_DEBUG
if (iface == NULL) {
DEBUG("6lo frag: iface == NULL, expect segmentation fault.\n");
/* remove original packet from packet buffer */
gnrc_pktbuf_release(fragment_msg->pkt);
/* 6LoWPAN free for next fragmentation */
fragment_msg->pkt = NULL;
return;
}
#endif
/* Check whether to send the first or an Nth fragment */
if (fragment_msg->offset == 0) {
/* increment tag for successive, fragmented datagrams */
_tag++;
if ((res = _send_1st_fragment(iface, fragment_msg->pkt, payload_len, fragment_msg->datagram_size)) == 0) {
/* error sending first fragment */
DEBUG("6lo frag: error sending 1st fragment\n");
gnrc_pktbuf_release(fragment_msg->pkt);
fragment_msg->pkt = NULL;
return;
}
fragment_msg->offset += res;
/* send message to self*/
msg.type = GNRC_SIXLOWPAN_MSG_FRAG_SND;
msg.content.ptr = (void *)fragment_msg;
msg_send_to_self(&msg);
thread_yield();
}
else {
/* (offset + (datagram_size - payload_len) < datagram_size) simplified */
if (fragment_msg->offset < payload_len) {
if ((res = _send_nth_fragment(iface, fragment_msg->pkt, payload_len, fragment_msg->datagram_size,
fragment_msg->offset)) == 0) {
/* error sending subsequent fragment */
DEBUG("6lo frag: error sending subsequent fragment (offset = %" PRIu16
")\n", fragment_msg->offset);
gnrc_pktbuf_release(fragment_msg->pkt);
fragment_msg->pkt = NULL;
return;
}
fragment_msg->offset += res;
/* send message to self*/
msg.type = GNRC_SIXLOWPAN_MSG_FRAG_SND;
msg.content.ptr = (void *)fragment_msg;
msg_send_to_self(&msg);
thread_yield();
}
else {
gnrc_pktbuf_release(fragment_msg->pkt);
fragment_msg->pkt = NULL;
}
}
}
static int _fill_ipv6_hdr(kernel_pid_t iface, gnrc_pktsnip_t *ipv6,
gnrc_pktsnip_t *payload)
{
int res;
ipv6_hdr_t *hdr = ipv6->data;
hdr->len = byteorder_htons(gnrc_pkt_len(payload));
DEBUG("ipv6: set payload length to %zu (network byteorder %04" PRIx16 ")\n",
gnrc_pkt_len(payload), hdr->len.u16);
/* check if e.g. extension header was not already marked */
if (hdr->nh == PROTNUM_RESERVED) {
hdr->nh = gnrc_nettype_to_protnum(payload->type);
/* if still reserved: mark no next header */
if (hdr->nh == PROTNUM_RESERVED) {
hdr->nh = PROTNUM_IPV6_NONXT;
}
}
DEBUG("ipv6: set next header to %" PRIu8 "\n", hdr->nh);
if (hdr->hl == 0) {
if (iface == KERNEL_PID_UNDEF) {
hdr->hl = GNRC_IPV6_NETIF_DEFAULT_HL;
}
else {
hdr->hl = gnrc_ipv6_netif_get(iface)->cur_hl;
}
}
if (ipv6_addr_is_unspecified(&hdr->src)) {
if (ipv6_addr_is_loopback(&hdr->dst)) {
ipv6_addr_set_loopback(&hdr->src);
}
else {
ipv6_addr_t *src = gnrc_ipv6_netif_find_best_src_addr(iface, &hdr->dst);
if (src != NULL) {
DEBUG("ipv6: set packet source to %s\n",
ipv6_addr_to_str(addr_str, src, sizeof(addr_str)));
memcpy(&hdr->src, src, sizeof(ipv6_addr_t));
}
/* Otherwise leave unspecified */
}
}
DEBUG("ipv6: calculate checksum for upper header.\n");
#if GNRC_NETIF_NUMOF > 1
if (payload->users > 1) {
gnrc_pktsnip_t *ptr = ipv6;
/* We deal with multiple interfaces here (multicast) => possible
* different source addresses => duplication of payload needed */
while (ptr != payload->next) {
gnrc_pktsnip_t *old = ptr->next;
/* duplicate everything including payload */
ptr->next = gnrc_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 /* GNRC_NETIF_NUMOF */
if ((res = gnrc_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;
}
static void _send(gnrc_pktsnip_t *pkt)
{
gnrc_netif_hdr_t *hdr;
gnrc_pktsnip_t *pkt2;
gnrc_netif_t *iface;
/* datagram_size: pure IPv6 packet without 6LoWPAN dispatches or compression */
size_t datagram_size;
if ((pkt == NULL) || (pkt->size < sizeof(gnrc_netif_hdr_t))) {
DEBUG("6lo: Sending packet has no netif header\n");
gnrc_pktbuf_release(pkt);
return;
}
if ((pkt->next == NULL) || (pkt->next->type != GNRC_NETTYPE_IPV6)) {
DEBUG("6lo: Sending packet has no IPv6 header\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt2 = gnrc_pktbuf_start_write(pkt);
if (pkt2 == NULL) {
DEBUG("6lo: no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
hdr = pkt2->data;
iface = gnrc_netif_get_by_pid(hdr->if_pid);
datagram_size = gnrc_pkt_len(pkt2->next);
if (iface == NULL) {
DEBUG("6lo: Can not get 6LoWPAN specific interface information.\n");
gnrc_pktbuf_release(pkt);
return;
}
#ifdef MODULE_GNRC_SIXLOWPAN_IPHC
if (iface->flags & GNRC_NETIF_FLAGS_6LO_HC) {
if (!gnrc_sixlowpan_iphc_encode(pkt2)) {
DEBUG("6lo: error on IPHC encoding\n");
gnrc_pktbuf_release(pkt2);
return;
}
/* IPHC dispatch does not count on dispatch length since it _shortens_
* the datagram */
}
else {
if (!_add_uncompr_disp(pkt2)) {
/* adding uncompressed dispatch failed */
DEBUG("6lo: no space left in packet buffer\n");
gnrc_pktbuf_release(pkt2);
return;
}
}
#else
/* suppress clang-analyzer report about iface being not read */
(void) iface;
if (!_add_uncompr_disp(pkt2)) {
/* adding uncompressed dispatch failed */
DEBUG("6lo: no space left in packet buffer\n");
gnrc_pktbuf_release(pkt2);
return;
}
#endif
DEBUG("6lo: iface->sixlo.max_frag_size = %" PRIu16 " for interface %"
PRIkernel_pid "\n", iface->sixlo.max_frag_size, hdr->if_pid);
/* IP should not send anything here if it is not a 6LoWPAN interface,
* so we don't need to check for NULL pointers.
* Note, that datagram_size cannot be used here, because the header size
* might be changed by IPHC. */
if (gnrc_pkt_len(pkt2->next) <= iface->sixlo.max_frag_size) {
DEBUG("6lo: Send SND command for %p to %" PRIu16 "\n",
(void *)pkt2, hdr->if_pid);
if (gnrc_netapi_send(hdr->if_pid, pkt2) < 1) {
DEBUG("6lo: unable to send %p over %" PRIu16 "\n", (void *)pkt, hdr->if_pid);
gnrc_pktbuf_release(pkt2);
}
return;
}
#ifdef MODULE_GNRC_SIXLOWPAN_FRAG
else if (fragment_msg.pkt != NULL) {
DEBUG("6lo: Fragmentation already ongoing. Dropping packet\n");
gnrc_pktbuf_release(pkt2);
return;
}
else if (datagram_size <= SIXLOWPAN_FRAG_MAX_LEN) {
DEBUG("6lo: Send fragmented (%u > %" PRIu16 ")\n",
(unsigned int)datagram_size, iface->max_frag_size);
msg_t msg;
fragment_msg.pid = hdr->if_pid;
fragment_msg.pkt = pkt2;
fragment_msg.datagram_size = datagram_size;
/* Sending the first fragment has an offset==0 */
fragment_msg.offset = 0;
/* set the outgoing message's fields */
msg.type = GNRC_SIXLOWPAN_MSG_FRAG_SND;
msg.content.ptr = &fragment_msg;
/* send message to self */
msg_send_to_self(&msg);
}
else {
DEBUG("6lo: packet too big (%u > %" PRIu16 ")\n",
(unsigned int)datagram_size, (uint16_t)SIXLOWPAN_FRAG_MAX_LEN);
gnrc_pktbuf_release(pkt2);
}
#else
(void) datagram_size;
DEBUG("6lo: packet too big (%u > %" PRIu16 ")\n",
(unsigned int)datagram_size, iface->max_frag_size);
gnrc_pktbuf_release(pkt2);
#endif
}
