static void _receive(ng_pktsnip_t *pkt)
{
ng_pktsnip_t *payload;
uint8_t *dispatch;
/* seize payload as a temporary variable */
payload = ng_pktbuf_start_write(pkt); /* need to duplicate since pkt->next
* might get replaced */
if (payload == NULL) {
DEBUG("6lo: can not get write access on received packet\n");
#if defined(DEVELHELP) && defined(ENABLE_DEBUG)
ng_pktbuf_stats();
#endif
ng_pktbuf_release(pkt);
return;
}
pkt = payload; /* reset pkt from temporary variable */
LL_SEARCH_SCALAR(pkt, payload, type, NG_NETTYPE_SIXLOWPAN);
if ((payload == NULL) || (payload->size < 1)) {
DEBUG("6lo: Received packet has no 6LoWPAN payload\n");
ng_pktbuf_release(pkt);
return;
}
dispatch = payload->data;
if (dispatch[0] == NG_SIXLOWPAN_UNCOMPRESSED) {
ng_pktsnip_t *sixlowpan;
DEBUG("6lo: received uncompressed IPv6 packet\n");
payload = ng_pktbuf_start_write(payload);
if (payload == NULL) {
DEBUG("6lo: can not get write access on received packet\n");
#if defined(DEVELHELP) && defined(ENABLE_DEBUG)
ng_pktbuf_stats();
#endif
ng_pktbuf_release(pkt);
return;
}
/* packet is uncompressed: just mark and remove the dispatch */
sixlowpan = ng_pktbuf_add(payload, payload->data, sizeof(uint8_t),
NG_NETTYPE_SIXLOWPAN);
if (sixlowpan == NULL) {
DEBUG("6lo: can not mark 6LoWPAN dispatch\n");
ng_pktbuf_release(pkt);
return;
}
pkt = ng_pktbuf_remove_snip(pkt, sixlowpan);
}
#ifdef MODULE_NG_SIXLOWPAN_FRAG
else if (ng_sixlowpan_frag_is((ng_sixlowpan_frag_t *)dispatch)) {
DEBUG("6lo: received 6LoWPAN fragment\n");
ng_sixlowpan_frag_handle_pkt(pkt);
return;
}
#endif
else {
DEBUG("6lo: dispatch %02x ... is not supported\n",
dispatch[0]);
ng_pktbuf_release(pkt);
return;
}
#ifdef MODULE_NG_SIXLOWPAN_IPHC
if (ng_sixlowpan_iphc_is(payload->data)) {
if (!ng_sixlowpan_iphc_decode(pkt)) {
DEBUG("6lo: error on IPHC decoding\n");
ng_pktbuf_release(pkt);
return;
}
LL_SEARCH_SCALAR(pkt, payload, type, NG_NETTYPE_IPV6);
}
#endif
payload->type = NG_NETTYPE_IPV6;
if (!ng_netapi_dispatch_receive(NG_NETTYPE_IPV6, NG_NETREG_DEMUX_CTX_ALL, pkt)) {
DEBUG("ipv6: No receivers for this packet found\n");
ng_pktbuf_release(pkt);
}
}
void _receive(ng_pktsnip_t *pkt)
{
ng_pktsnip_t *payload;
uint8_t *dispatch;
ng_netreg_entry_t *entry;
LL_SEARCH_SCALAR(pkt, payload, type, NG_NETTYPE_SIXLOWPAN);
if ((payload == NULL) || (payload->size < 1)) {
DEBUG("6lo: Received packet has no 6LoWPAN payload\n");
ng_pktbuf_release(pkt);
}
dispatch = payload->data;
if (dispatch[0] == NG_SIXLOWPAN_UNCOMPRESSED) {
ng_pktsnip_t *sixlowpan;
DEBUG("6lo: received uncompressed IPv6 packet\n");
payload = ng_pktbuf_start_write(payload);
if (payload == NULL) {
DEBUG("6lo: can not get write access on received packet\n");
#if defined(DEVELHELP) && defined(ENABLE_DEBUG)
ng_pktbuf_stats();
#endif
ng_pktbuf_release(pkt);
return;
}
/* packet is uncompressed: just mark and remove the dispatch */
sixlowpan = ng_pktbuf_add(payload, payload->data, sizeof(uint8_t),
NG_NETTYPE_SIXLOWPAN);
LL_DELETE(pkt, sixlowpan);
ng_pktbuf_release(sixlowpan);
}
#ifdef MODULE_NG_SIXLOWPAN_FRAG
else if (ng_sixlowpan_frag_is((ng_sixlowpan_frag_t *)dispatch)) {
DEBUG("6lo: received 6LoWPAN fragment\n");
ng_sixlowpan_frag_handle_pkt(pkt);
}
#endif
else {
DEBUG("6lo: dispatch %02x ... is not supported\n",
dispatch[0]);
ng_pktbuf_release(pkt);
return;
}
payload->type = NG_NETTYPE_IPV6;
entry = ng_netreg_lookup(NG_NETTYPE_IPV6, NG_NETREG_DEMUX_CTX_ALL);
if (entry == NULL) {
DEBUG("ipv6: No receivers for this packet found\n");
ng_pktbuf_release(pkt);
return;
}
ng_pktbuf_hold(pkt, ng_netreg_num(NG_NETTYPE_IPV6, NG_NETREG_DEMUX_CTX_ALL) - 1);
while (entry) {
DEBUG("6lo: Send receive command for %p to %" PRIu16 "\n",
(void *)pkt, entry->pid);
ng_netapi_receive(entry->pid, pkt);
entry = ng_netreg_getnext(entry);
}
}
