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