| /** |
| * @file |
| * |
| * Ethernet output for IPv6. Uses ND tables for link-layer addressing. |
| */ |
| |
| /* |
| * Copyright (c) 2010 Inico Technologies Ltd. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
| * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
| * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
| * OF SUCH DAMAGE. |
| * |
| * This file is part of the lwIP TCP/IP stack. |
| * |
| * Author: Ivan Delamer <delamer@inicotech.com> |
| * |
| * |
| * Please coordinate changes and requests with Ivan Delamer |
| * <delamer@inicotech.com> |
| */ |
| |
| #include "lwip/opt.h" |
| |
| #if LWIP_IPV6 && LWIP_ETHERNET |
| |
| #include "lwip/ethip6.h" |
| #include "lwip/nd6.h" |
| #include "lwip/pbuf.h" |
| #include "lwip/ip6.h" |
| #include "lwip/ip6_addr.h" |
| #include "lwip/inet_chksum.h" |
| #include "lwip/netif.h" |
| #include "lwip/icmp6.h" |
| #include "lwip/prot/ethernet.h" |
| #include "netif/ethernet.h" |
| |
| #include <string.h> |
| |
| /** |
| * Resolve and fill-in Ethernet address header for outgoing IPv6 packet. |
| * |
| * For IPv6 multicast, corresponding Ethernet addresses |
| * are selected and the packet is transmitted on the link. |
| * |
| * For unicast addresses, ask the ND6 module what to do. It will either let us |
| * send the the packet right away, or queue the packet for later itself, unless |
| * an error occurs. |
| * |
| * @todo anycast addresses |
| * |
| * @param netif The lwIP network interface which the IP packet will be sent on. |
| * @param q The pbuf(s) containing the IP packet to be sent. |
| * @param ip6addr The IP address of the packet destination. |
| * |
| * @return |
| * - ERR_OK or the return value of @ref nd6_get_next_hop_addr_or_queue. |
| */ |
| err_t |
| ethip6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr) |
| { |
| struct eth_addr dest; |
| const u8_t *hwaddr; |
| err_t result; |
| |
| LWIP_ASSERT_CORE_LOCKED(); |
| |
| /* The destination IP address must be properly zoned from here on down. */ |
| IP6_ADDR_ZONECHECK_NETIF(ip6addr, netif); |
| |
| /* multicast destination IP address? */ |
| if (ip6_addr_ismulticast(ip6addr)) { |
| /* Hash IP multicast address to MAC address.*/ |
| dest.addr[0] = 0x33; |
| dest.addr[1] = 0x33; |
| dest.addr[2] = ((const u8_t *)(&(ip6addr->addr[3])))[0]; |
| dest.addr[3] = ((const u8_t *)(&(ip6addr->addr[3])))[1]; |
| dest.addr[4] = ((const u8_t *)(&(ip6addr->addr[3])))[2]; |
| dest.addr[5] = ((const u8_t *)(&(ip6addr->addr[3])))[3]; |
| |
| /* Send out. */ |
| return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6); |
| } |
| |
| /* We have a unicast destination IP address */ |
| /* @todo anycast? */ |
| |
| /* Ask ND6 what to do with the packet. */ |
| result = nd6_get_next_hop_addr_or_queue(netif, q, ip6addr, &hwaddr); |
| if (result != ERR_OK) { |
| return result; |
| } |
| |
| /* If no hardware address is returned, nd6 has queued the packet for later. */ |
| if (hwaddr == NULL) { |
| return ERR_OK; |
| } |
| |
| /* Send out the packet using the returned hardware address. */ |
| SMEMCPY(dest.addr, hwaddr, 6); |
| return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6); |
| } |
| |
| #endif /* LWIP_IPV6 && LWIP_ETHERNET */ |