static void _dispatch_rcv_pkt(gnrc_nettype_t type, uint32_t demux_ctx,
gnrc_pktsnip_t *pkt)
{
gnrc_netreg_entry_t *entry = gnrc_netreg_lookup(type, demux_ctx);
while (entry) {
DEBUG("ipv6: Send receive command for %p to %" PRIu16 "\n", (void *)pkt,
entry->pid);
gnrc_netapi_receive(entry->pid, pkt);
entry = gnrc_netreg_getnext(entry);
}
}
int gnrc_netapi_dispatch(gnrc_nettype_t type, uint32_t demux_ctx,
uint16_t cmd, gnrc_pktsnip_t *pkt)
{
int numof = gnrc_netreg_num(type, demux_ctx);
if (numof != 0) {
gnrc_netreg_entry_t *sendto = gnrc_netreg_lookup(type, demux_ctx);
gnrc_pktbuf_hold(pkt, numof - 1);
while (sendto) {
if (_snd_rcv(sendto->pid, cmd, pkt) < 1) {
/* unable to dispatch packet */
gnrc_pktbuf_release(pkt);
}
sendto = gnrc_netreg_getnext(sendto);
}
}
return numof;
}
void gnrc_icmpv6_echo_req_handle(kernel_pid_t iface, ipv6_hdr_t *ipv6_hdr,
icmpv6_echo_t *echo, uint16_t len)
{
uint8_t *payload = ((uint8_t *)echo) + sizeof(icmpv6_echo_t);
gnrc_pktsnip_t *hdr, *pkt;
gnrc_netreg_entry_t *sendto = NULL;
if ((echo == NULL) || (len < sizeof(icmpv6_echo_t))) {
DEBUG("icmpv6_echo: echo was NULL or len (%" PRIu16
") was < sizeof(icmpv6_echo_t)\n", len);
return;
}
pkt = gnrc_icmpv6_echo_build(ICMPV6_ECHO_REP, byteorder_ntohs(echo->id),
byteorder_ntohs(echo->seq), payload,
len - sizeof(icmpv6_echo_t));
if (pkt == NULL) {
DEBUG("icmpv6_echo: no space left in packet buffer\n");
return;
}
if (ipv6_addr_is_multicast(&ipv6_hdr->dst)) {
hdr = gnrc_ipv6_hdr_build(pkt, NULL, 0, (uint8_t *)&ipv6_hdr->src,
sizeof(ipv6_addr_t));
}
else {
hdr = gnrc_ipv6_hdr_build(pkt, (uint8_t *)&ipv6_hdr->dst,
sizeof(ipv6_addr_t), (uint8_t *)&ipv6_hdr->src,
sizeof(ipv6_addr_t));
}
if (hdr == NULL) {
DEBUG("icmpv6_echo: no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = hdr;
hdr = gnrc_netif_hdr_build(NULL, 0, NULL, 0);
((gnrc_netif_hdr_t *)hdr->data)->if_pid = iface;
LL_PREPEND(pkt, hdr);
sendto = gnrc_netreg_lookup(GNRC_NETTYPE_IPV6, GNRC_NETREG_DEMUX_CTX_ALL);
if (sendto == NULL) {
DEBUG("icmpv6_echo: no receivers for IPv6 packets\n");
gnrc_pktbuf_release(pkt);
return;
}
/* ICMPv6 is not interested anymore so `- 1` */
gnrc_pktbuf_hold(pkt, gnrc_netreg_num(GNRC_NETTYPE_IPV6, GNRC_NETREG_DEMUX_CTX_ALL) - 1);
while (sendto != NULL) {
if (gnrc_netapi_send(sendto->pid, pkt) < 1) {
DEBUG("icmpv6_echo: unable to send packet\n");
gnrc_pktbuf_release(pkt);
}
sendto = gnrc_netreg_getnext(sendto);
}
}
void gnrc_icmpv6_demux(kernel_pid_t iface, gnrc_pktsnip_t *pkt)
{
gnrc_pktsnip_t *icmpv6, *ipv6;
icmpv6_hdr_t *hdr;
gnrc_netreg_entry_t *sendto;
LL_SEARCH_SCALAR(pkt, icmpv6, type, GNRC_NETTYPE_ICMPV6);
assert(icmpv6 != NULL);
/* there can be extension headers between IPv6 and ICMPv6 header so we have
* to search it */
LL_SEARCH_SCALAR(icmpv6, ipv6, type, GNRC_NETTYPE_IPV6);
assert(ipv6 != NULL);
hdr = (icmpv6_hdr_t *)icmpv6->data;
if (_calc_csum(icmpv6, ipv6, pkt)) {
DEBUG("icmpv6: wrong checksum.\n");
/* don't release: IPv6 does this */
return;
}
switch (hdr->type) {
/* TODO: handle ICMPv6 errors */
#ifdef MODULE_GNRC_ICMPV6_ECHO
case ICMPV6_ECHO_REQ:
DEBUG("icmpv6: handle echo request.\n");
gnrc_icmpv6_echo_req_handle(iface, (ipv6_hdr_t *)ipv6->data,
(icmpv6_echo_t *)hdr, icmpv6->size);
break;
#endif
case ICMPV6_RTR_SOL:
DEBUG("icmpv6: router solicitation received\n");
/* TODO */
break;
case ICMPV6_RTR_ADV:
DEBUG("icmpv6: router advertisement received\n");
/* TODO */
break;
case ICMPV6_NBR_SOL:
DEBUG("icmpv6: neighbor solicitation received\n");
gnrc_ndp_nbr_sol_handle(iface, pkt, ipv6->data, (ndp_nbr_sol_t *)hdr,
icmpv6->size);
break;
case ICMPV6_NBR_ADV:
DEBUG("icmpv6: neighbor advertisement received\n");
gnrc_ndp_nbr_adv_handle(iface, pkt, ipv6->data, (ndp_nbr_adv_t *)hdr,
icmpv6->size);
break;
case ICMPV6_REDIRECT:
DEBUG("icmpv6: redirect message received\n");
/* TODO */
break;
default:
DEBUG("icmpv6: unknown type field %" PRIu8 "\n", hdr->type);
break;
}
/* ICMPv6-all will be send in gnrc_ipv6.c so only dispatch of subtypes is
* needed */
sendto = gnrc_netreg_lookup(GNRC_NETTYPE_ICMPV6, hdr->type);
if (sendto == NULL) {
DEBUG("icmpv6: no receivers for ICMPv6 type %" PRIu8 "\n", hdr->type);
/* don't release: IPv6 does this */
return;
}
/* ICMPv6 is not interested anymore so `- 1` */
gnrc_pktbuf_hold(pkt, gnrc_netreg_num(GNRC_NETTYPE_ICMPV6, hdr->type));
while (sendto != NULL) {
gnrc_netapi_receive(sendto->pid, pkt);
sendto = gnrc_netreg_getnext(sendto);
}
}
