BadVPN – Blame information for rev 1
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1 | office | 1 | /** |
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 | |||
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 | |||
42 | #include "lwip/opt.h" |
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43 | |||
44 | #if LWIP_IPV6 && LWIP_ETHERNET |
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45 | |||
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 | |||
57 | #include <string.h> |
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58 | |||
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 | |||
85 | /* The destination IP address must be properly zoned from here on down. */ |
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86 | IP6_ADDR_ZONECHECK_NETIF(ip6addr, netif); |
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87 | |||
88 | /* multicast destination IP address? */ |
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89 | if (ip6_addr_ismulticast(ip6addr)) { |
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90 | /* Hash IP multicast address to MAC address.*/ |
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91 | dest.addr[0] = 0x33; |
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92 | dest.addr[1] = 0x33; |
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93 | dest.addr[2] = ((const u8_t *)(&(ip6addr->addr[3])))[0]; |
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94 | dest.addr[3] = ((const u8_t *)(&(ip6addr->addr[3])))[1]; |
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95 | dest.addr[4] = ((const u8_t *)(&(ip6addr->addr[3])))[2]; |
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96 | dest.addr[5] = ((const u8_t *)(&(ip6addr->addr[3])))[3]; |
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97 | |||
98 | /* Send out. */ |
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99 | return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6); |
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100 | } |
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101 | |||
102 | /* We have a unicast destination IP address */ |
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103 | /* @todo anycast? */ |
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104 | |||
105 | /* Ask ND6 what to do with the packet. */ |
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106 | result = nd6_get_next_hop_addr_or_queue(netif, q, ip6addr, &hwaddr); |
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107 | if (result != ERR_OK) { |
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108 | return result; |
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109 | } |
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110 | |||
111 | /* If no hardware address is returned, nd6 has queued the packet for later. */ |
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112 | if (hwaddr == NULL) { |
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113 | return ERR_OK; |
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114 | } |
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115 | |||
116 | /* Send out the packet using the returned hardware address. */ |
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117 | SMEMCPY(dest.addr, hwaddr, 6); |
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118 | return ethernet_output(netif, q, (const struct eth_addr*)(netif->hwaddr), &dest, ETHTYPE_IPV6); |
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119 | } |
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120 | |||
121 | #endif /* LWIP_IPV6 && LWIP_ETHERNET */ |