/**
If this neighbor is unknown, use node to connect to neighbor.
@return neighbor from bucket. NULL if given self id.
*/
KDA_Neighbor*
check_neighbor(MPIRPC_Node node, KDA_Neighbor* neighbor)
{
NOTE_FX(neighbor->id);
KDA_Neighbor* result;
if (neighbor_add(neighbor))
KDA_Join(node, neighbor);
result = neighbor_lookup(neighbor);
return result;
}
void neighbor_out(FAR struct net_driver_s *dev)
{
FAR const struct neighbor_addr_s *naddr;
FAR struct eth_hdr_s *eth = ETHBUF;
FAR struct ipv6_hdr_s *ip = IPv6BUF;
net_ipv6addr_t ipaddr;
/* Skip sending Neighbor Solicitations when the frame to be transmitted was
* written into a packet socket or if we are sending certain Neighbor
* messages (solicitation, advertisement, echo request).
*/
if (IFF_IS_NOARP(dev->d_flags))
{
/* Clear the indication and let the packet continue on its way. */
IFF_CLR_NOARP(dev->d_flags);
return;
}
/* Find the destination IPv6 address in the Neighbor Table and construct
* the Ethernet header. If the destination IPv6 address isn't on the local
* network, we use the default router's IPv6 address instead.
*
* If no Neighbor Table entry is found, we overwrite the original IPv6
* packet with an Neighbor Solicitation Request for the IPv6 address.
*/
/* First check if destination is a IPv6 multicast address. IPv6
* multicast addresses in IPv6 have the prefix ff00::/8
*
* Bits 120-127: Prefix
* Bits 116-119: Flags (1, 2, or 3 defined)
* Bits 112-115: Scope
*
* REVISIT: Need to revisit IPv6 broadcast support. Broadcast
* IP addresses are not used with IPv6; multicast is used instead.
* Does this mean that all multicast address should go to the
* broadcast Ethernet address?
*/
if ((ip->destipaddr[0] & HTONS(0xff00)) == HTONS(0xff00))
{
memcpy(eth->dest, g_broadcast_ethaddr.ether_addr_octet,
ETHER_ADDR_LEN);
}
#ifdef CONFIG_NET_IGMP
/* Check if the destination address is a multicast address
*
* IPv6 multicast addresses are have the high-order octet of the
* addresses=0xff (ff00::/8.)
*
* REVISIT: See comments above. How do we distinguish broadcast
* from IGMP multicast?
*/
#warning Missing logic
#endif
else
{
/* Check if the destination address is on the local network. */
if (!net_ipv6addr_maskcmp(ip->destipaddr, dev->d_ipv6addr,
dev->d_ipv6netmask))
{
/* Destination address is not on the local network */
#ifdef CONFIG_NET_ROUTE
/* We have a routing table.. find the correct router to use in
* this case (or, as a fall-back, use the device's default router
* address). We will use the router IPv6 address instead of the
* destination address when determining the MAC address.
*/
netdev_ipv6_router(dev, ip->destipaddr, ipaddr);
#else
/* Use the device's default router IPv6 address instead of the
* destination address when determining the MAC address.
*/
net_ipv6addr_copy(ipaddr, dev->d_ipv6draddr);
#endif
}
else
{
/* Else, we use the destination IPv6 address. */
net_ipv6addr_copy(ipaddr, ip->destipaddr);
}
/* Check if we already have this destination address in the Neighbor Table */
naddr = neighbor_lookup(ipaddr);
if (!naddr)
{
nllvdbg("IPv6 Neighbor solicitation for IPv6\n");
/* The destination address was not in our Neighbor Table, so we
* overwrite the IPv6 packet with an ICMDv6 Neighbor Solicitation
* message.
*/
icmpv6_solicit(dev, ipaddr);
return;
}
/* Build an Ethernet header. */
memcpy(eth->dest, naddr->na_addr.ether_addr_octet, ETHER_ADDR_LEN);
}
/* Finish populating the Ethernet header */
memcpy(eth->src, dev->d_mac.ether_addr_octet, ETHER_ADDR_LEN);
eth->type = HTONS(ETHTYPE_IP6);
/* Add the size of the layer layer header to the total size of the
* outgoing packet.
*/
dev->d_len += netdev_ipv6_hdrlen(dev);
nllvdbg("Outgoing IPv6 Packet length: %d (%d)\n",
dev->d_len, (ip->len[0] << 8) | ip->len[1]);
}