[457] | 1 | /**
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| 2 | * @file
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| 3 | *
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| 4 | * Ethernet output for IPv6. Uses ND tables for link-layer addressing.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (c) 2010 Inico Technologies Ltd.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without modification,
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| 12 | * are permitted provided that the following conditions are met:
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| 13 | *
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| 14 | * 1. Redistributions of source code must retain the above copyright notice,
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| 15 | * this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 17 | * this list of conditions and the following disclaimer in the documentation
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| 18 | * and/or other materials provided with the distribution.
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| 19 | * 3. The name of the author may not be used to endorse or promote products
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| 20 | * derived from this software without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 25 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 27 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 31 | * OF SUCH DAMAGE.
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| 32 | *
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| 33 | * This file is part of the lwIP TCP/IP stack.
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| 34 | *
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| 35 | * Author: Ivan Delamer <delamer@inicotech.com>
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| 36 | *
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| 37 | *
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| 38 | * Please coordinate changes and requests with Ivan Delamer
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| 39 | * <delamer@inicotech.com>
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| 40 | */
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| 41 |
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| 42 | #include "lwip/opt.h"
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| 43 |
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| 44 | #if LWIP_IPV6 && LWIP_ETHERNET
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| 45 |
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| 46 | #include "lwip/ethip6.h"
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| 47 | #include "lwip/nd6.h"
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| 48 | #include "lwip/pbuf.h"
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| 49 | #include "lwip/ip6.h"
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| 50 | #include "lwip/ip6_addr.h"
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| 51 | #include "lwip/inet_chksum.h"
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| 52 | #include "lwip/netif.h"
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| 53 | #include "lwip/icmp6.h"
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| 54 | #include "lwip/prot/ethernet.h"
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| 55 | #include "netif/ethernet.h"
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| 56 |
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| 57 | #include <string.h>
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| 58 |
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| 59 | /**
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| 60 | * Resolve and fill-in Ethernet address header for outgoing IPv6 packet.
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| 61 | *
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| 62 | * For IPv6 multicast, corresponding Ethernet addresses
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| 63 | * are selected and the packet is transmitted on the link.
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| 64 | *
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| 65 | * For unicast addresses, ask the ND6 module what to do. It will either let us
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| 66 | * send the the packet right away, or queue the packet for later itself, unless
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| 67 | * an error occurs.
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| 68 | *
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| 69 | * @todo anycast addresses
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| 70 | *
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| 71 | * @param netif The lwIP network interface which the IP packet will be sent on.
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| 72 | * @param q The pbuf(s) containing the IP packet to be sent.
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| 73 | * @param ip6addr The IP address of the packet destination.
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| 74 | *
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| 75 | * @return
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| 76 | * - ERR_OK or the return value of @ref nd6_get_next_hop_addr_or_queue.
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| 77 | */
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| 78 | err_t
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| 79 | ethip6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
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| 80 | {
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| 81 | struct eth_addr dest;
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| 82 | const u8_t *hwaddr;
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| 83 | err_t result;
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| 84 |
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| 85 | LWIP_ASSERT_CORE_LOCKED();
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| 86 |
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| 87 | /* The destination IP address must be properly zoned from here on down. */
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| 88 | IP6_ADDR_ZONECHECK_NETIF(ip6addr, netif);
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| 89 |
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| 90 | /* multicast destination IP address? */
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| 91 | if (ip6_addr_ismulticast(ip6addr)) {
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| 92 | /* Hash IP multicast address to MAC address.*/
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| 93 | dest.addr[0] = 0x33;
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| 94 | dest.addr[1] = 0x33;
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| 95 | dest.addr[2] = ((const u8_t *)(&(ip6addr->addr[3])))[0];
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| 96 | dest.addr[3] = ((const u8_t *)(&(ip6addr->addr[3])))[1];
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| 97 | dest.addr[4] = ((const u8_t *)(&(ip6addr->addr[3])))[2];
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| 98 | dest.addr[5] = ((const u8_t *)(&(ip6addr->addr[3])))[3];
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| 99 |
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| 100 | /* Send out. */
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| 101 | return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6);
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| 102 | }
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| 103 |
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| 104 | /* We have a unicast destination IP address */
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| 105 | /* @todo anycast? */
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| 106 |
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| 107 | /* Ask ND6 what to do with the packet. */
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| 108 | result = nd6_get_next_hop_addr_or_queue(netif, q, ip6addr, &hwaddr);
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| 109 | if (result != ERR_OK) {
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| 110 | return result;
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| 111 | }
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| 112 |
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| 113 | /* If no hardware address is returned, nd6 has queued the packet for later. */
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| 114 | if (hwaddr == NULL) {
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| 115 | return ERR_OK;
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| 116 | }
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| 117 |
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| 118 | /* Send out the packet using the returned hardware address. */
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| 119 | SMEMCPY(dest.addr, hwaddr, 6);
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| 120 | return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6);
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| 121 | }
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| 122 |
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| 123 | #endif /* LWIP_IPV6 && LWIP_ETHERNET */
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