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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