[457] | 1 | /**
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| 2 | * @file
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| 3 | * Ethernet common functions
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| 4 | *
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| 5 | * @defgroup ethernet Ethernet
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| 6 | * @ingroup callbackstyle_api
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| 7 | */
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| 8 |
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| 9 | /*
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| 10 | * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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| 11 | * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
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| 12 | * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
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| 13 | * All rights reserved.
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| 14 | *
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| 15 | * Redistribution and use in source and binary forms, with or without modification,
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| 16 | * are permitted provided that the following conditions are met:
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| 17 | *
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| 18 | * 1. Redistributions of source code must retain the above copyright notice,
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| 19 | * this list of conditions and the following disclaimer.
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| 20 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 21 | * this list of conditions and the following disclaimer in the documentation
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| 22 | * and/or other materials provided with the distribution.
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| 23 | * 3. The name of the author may not be used to endorse or promote products
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| 24 | * derived from this software without specific prior written permission.
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| 25 | *
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| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 27 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 28 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 29 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 31 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 34 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 35 | * OF SUCH DAMAGE.
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| 36 | *
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| 37 | * This file is part of the lwIP TCP/IP stack.
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| 38 | *
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| 39 | */
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| 40 |
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| 41 | #include "lwip/opt.h"
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| 42 |
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| 43 | #if LWIP_ARP || LWIP_ETHERNET
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| 44 |
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| 45 | #include "netif/ethernet.h"
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| 46 | #include "lwip/def.h"
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| 47 | #include "lwip/stats.h"
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| 48 | #include "lwip/etharp.h"
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| 49 | #include "lwip/ip.h"
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| 50 | #include "lwip/snmp.h"
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| 51 |
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| 52 | #include <string.h>
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| 53 |
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| 54 | #include "netif/ppp/ppp_opts.h"
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| 55 | #if PPPOE_SUPPORT
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| 56 | #include "netif/ppp/pppoe.h"
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| 57 | #endif /* PPPOE_SUPPORT */
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| 58 |
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| 59 | #ifdef LWIP_HOOK_FILENAME
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| 60 | #include LWIP_HOOK_FILENAME
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| 61 | #endif
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| 62 |
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| 63 | const struct eth_addr ethbroadcast = {{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}};
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| 64 | const struct eth_addr ethzero = {{0, 0, 0, 0, 0, 0}};
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| 65 |
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| 66 | /**
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| 67 | * @ingroup lwip_nosys
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| 68 | * Process received ethernet frames. Using this function instead of directly
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| 69 | * calling ip_input and passing ARP frames through etharp in ethernetif_input,
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| 70 | * the ARP cache is protected from concurrent access.\n
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| 71 | * Don't call directly, pass to netif_add() and call netif->input().
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| 72 | *
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| 73 | * @param p the received packet, p->payload pointing to the ethernet header
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| 74 | * @param netif the network interface on which the packet was received
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| 75 | *
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| 76 | * @see LWIP_HOOK_UNKNOWN_ETH_PROTOCOL
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| 77 | * @see ETHARP_SUPPORT_VLAN
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| 78 | * @see LWIP_HOOK_VLAN_CHECK
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| 79 | */
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| 80 | err_t
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| 81 | ethernet_input(struct pbuf *p, struct netif *netif)
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| 82 | {
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| 83 | struct eth_hdr *ethhdr;
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| 84 | u16_t type;
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| 85 | #if LWIP_ARP || ETHARP_SUPPORT_VLAN || LWIP_IPV6
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| 86 | u16_t next_hdr_offset = SIZEOF_ETH_HDR;
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| 87 | #endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */
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| 88 |
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| 89 | LWIP_ASSERT_CORE_LOCKED();
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| 90 |
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| 91 | if (p->len <= SIZEOF_ETH_HDR) {
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| 92 | /* a packet with only an ethernet header (or less) is not valid for us */
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| 93 | ETHARP_STATS_INC(etharp.proterr);
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| 94 | ETHARP_STATS_INC(etharp.drop);
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| 95 | MIB2_STATS_NETIF_INC(netif, ifinerrors);
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| 96 | goto free_and_return;
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| 97 | }
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| 98 |
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| 99 | if (p->if_idx == NETIF_NO_INDEX) {
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| 100 | p->if_idx = netif_get_index(netif);
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| 101 | }
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| 102 |
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| 103 | /* points to packet payload, which starts with an Ethernet header */
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| 104 | ethhdr = (struct eth_hdr *)p->payload;
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| 105 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
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| 106 | ("ethernet_input: dest:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", src:%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F":%"X8_F", type:%"X16_F"\n",
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| 107 | (unsigned char)ethhdr->dest.addr[0], (unsigned char)ethhdr->dest.addr[1], (unsigned char)ethhdr->dest.addr[2],
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| 108 | (unsigned char)ethhdr->dest.addr[3], (unsigned char)ethhdr->dest.addr[4], (unsigned char)ethhdr->dest.addr[5],
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| 109 | (unsigned char)ethhdr->src.addr[0], (unsigned char)ethhdr->src.addr[1], (unsigned char)ethhdr->src.addr[2],
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| 110 | (unsigned char)ethhdr->src.addr[3], (unsigned char)ethhdr->src.addr[4], (unsigned char)ethhdr->src.addr[5],
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| 111 | lwip_htons(ethhdr->type)));
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| 112 |
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| 113 | type = ethhdr->type;
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| 114 | #if ETHARP_SUPPORT_VLAN
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| 115 | if (type == PP_HTONS(ETHTYPE_VLAN)) {
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| 116 | struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr *)(((char *)ethhdr) + SIZEOF_ETH_HDR);
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| 117 | next_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
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| 118 | if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
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| 119 | /* a packet with only an ethernet/vlan header (or less) is not valid for us */
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| 120 | ETHARP_STATS_INC(etharp.proterr);
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| 121 | ETHARP_STATS_INC(etharp.drop);
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| 122 | MIB2_STATS_NETIF_INC(netif, ifinerrors);
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| 123 | goto free_and_return;
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| 124 | }
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| 125 | #if defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
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| 126 | #ifdef LWIP_HOOK_VLAN_CHECK
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| 127 | if (!LWIP_HOOK_VLAN_CHECK(netif, ethhdr, vlan)) {
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| 128 | #elif defined(ETHARP_VLAN_CHECK_FN)
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| 129 | if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
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| 130 | #elif defined(ETHARP_VLAN_CHECK)
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| 131 | if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
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| 132 | #endif
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| 133 | /* silently ignore this packet: not for our VLAN */
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| 134 | pbuf_free(p);
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| 135 | return ERR_OK;
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| 136 | }
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| 137 | #endif /* defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
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| 138 | type = vlan->tpid;
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| 139 | }
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| 140 | #endif /* ETHARP_SUPPORT_VLAN */
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| 141 |
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| 142 | #if LWIP_ARP_FILTER_NETIF
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| 143 | netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, lwip_htons(type));
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| 144 | #endif /* LWIP_ARP_FILTER_NETIF*/
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| 145 |
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| 146 | if (ethhdr->dest.addr[0] & 1) {
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| 147 | /* this might be a multicast or broadcast packet */
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| 148 | if (ethhdr->dest.addr[0] == LL_IP4_MULTICAST_ADDR_0) {
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| 149 | #if LWIP_IPV4
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| 150 | if ((ethhdr->dest.addr[1] == LL_IP4_MULTICAST_ADDR_1) &&
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| 151 | (ethhdr->dest.addr[2] == LL_IP4_MULTICAST_ADDR_2)) {
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| 152 | /* mark the pbuf as link-layer multicast */
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| 153 | p->flags |= PBUF_FLAG_LLMCAST;
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| 154 | }
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| 155 | #endif /* LWIP_IPV4 */
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| 156 | }
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| 157 | #if LWIP_IPV6
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| 158 | else if ((ethhdr->dest.addr[0] == LL_IP6_MULTICAST_ADDR_0) &&
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| 159 | (ethhdr->dest.addr[1] == LL_IP6_MULTICAST_ADDR_1)) {
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| 160 | /* mark the pbuf as link-layer multicast */
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| 161 | p->flags |= PBUF_FLAG_LLMCAST;
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| 162 | }
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| 163 | #endif /* LWIP_IPV6 */
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| 164 | else if (eth_addr_cmp(ðhdr->dest, ðbroadcast)) {
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| 165 | /* mark the pbuf as link-layer broadcast */
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| 166 | p->flags |= PBUF_FLAG_LLBCAST;
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| 167 | }
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| 168 | }
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| 169 |
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| 170 | switch (type) {
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| 171 | #if LWIP_IPV4 && LWIP_ARP
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| 172 | /* IP packet? */
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| 173 | case PP_HTONS(ETHTYPE_IP):
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| 174 | if (!(netif->flags & NETIF_FLAG_ETHARP)) {
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| 175 | goto free_and_return;
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| 176 | }
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| 177 | /* skip Ethernet header (min. size checked above) */
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| 178 | if (pbuf_remove_header(p, next_hdr_offset)) {
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| 179 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
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| 180 | ("ethernet_input: IPv4 packet dropped, too short (%"U16_F"/%"U16_F")\n",
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| 181 | p->tot_len, next_hdr_offset));
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| 182 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
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| 183 | goto free_and_return;
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| 184 | } else {
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| 185 | /* pass to IP layer */
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| 186 | ip4_input(p, netif);
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| 187 | }
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| 188 | break;
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| 189 |
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| 190 | case PP_HTONS(ETHTYPE_ARP):
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| 191 | if (!(netif->flags & NETIF_FLAG_ETHARP)) {
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| 192 | goto free_and_return;
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| 193 | }
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| 194 | /* skip Ethernet header (min. size checked above) */
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| 195 | if (pbuf_remove_header(p, next_hdr_offset)) {
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| 196 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
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| 197 | ("ethernet_input: ARP response packet dropped, too short (%"U16_F"/%"U16_F")\n",
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| 198 | p->tot_len, next_hdr_offset));
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| 199 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
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| 200 | ETHARP_STATS_INC(etharp.lenerr);
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| 201 | ETHARP_STATS_INC(etharp.drop);
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| 202 | goto free_and_return;
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| 203 | } else {
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| 204 | /* pass p to ARP module */
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| 205 | etharp_input(p, netif);
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| 206 | }
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| 207 | break;
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| 208 | #endif /* LWIP_IPV4 && LWIP_ARP */
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| 209 | #if PPPOE_SUPPORT
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| 210 | case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
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| 211 | pppoe_disc_input(netif, p);
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| 212 | break;
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| 213 |
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| 214 | case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
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| 215 | pppoe_data_input(netif, p);
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| 216 | break;
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| 217 | #endif /* PPPOE_SUPPORT */
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| 218 |
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| 219 | #if LWIP_IPV6
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| 220 | case PP_HTONS(ETHTYPE_IPV6): /* IPv6 */
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| 221 | /* skip Ethernet header */
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| 222 | if ((p->len < next_hdr_offset) || pbuf_remove_header(p, next_hdr_offset)) {
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| 223 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
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| 224 | ("ethernet_input: IPv6 packet dropped, too short (%"U16_F"/%"U16_F")\n",
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| 225 | p->tot_len, next_hdr_offset));
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| 226 | goto free_and_return;
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| 227 | } else {
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| 228 | /* pass to IPv6 layer */
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| 229 | ip6_input(p, netif);
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| 230 | }
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| 231 | break;
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| 232 | #endif /* LWIP_IPV6 */
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| 233 |
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| 234 | default:
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| 235 | #ifdef LWIP_HOOK_UNKNOWN_ETH_PROTOCOL
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| 236 | if (LWIP_HOOK_UNKNOWN_ETH_PROTOCOL(p, netif) == ERR_OK) {
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| 237 | break;
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| 238 | }
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| 239 | #endif
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| 240 | ETHARP_STATS_INC(etharp.proterr);
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| 241 | ETHARP_STATS_INC(etharp.drop);
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| 242 | MIB2_STATS_NETIF_INC(netif, ifinunknownprotos);
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| 243 | goto free_and_return;
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| 244 | }
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| 245 |
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| 246 | /* This means the pbuf is freed or consumed,
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| 247 | so the caller doesn't have to free it again */
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| 248 | return ERR_OK;
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| 249 |
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| 250 | free_and_return:
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| 251 | pbuf_free(p);
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| 252 | return ERR_OK;
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| 253 | }
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| 254 |
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| 255 | /**
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| 256 | * @ingroup ethernet
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| 257 | * Send an ethernet packet on the network using netif->linkoutput().
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| 258 | * The ethernet header is filled in before sending.
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| 259 | *
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| 260 | * @see LWIP_HOOK_VLAN_SET
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| 261 | *
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| 262 | * @param netif the lwIP network interface on which to send the packet
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| 263 | * @param p the packet to send. pbuf layer must be @ref PBUF_LINK.
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| 264 | * @param src the source MAC address to be copied into the ethernet header
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| 265 | * @param dst the destination MAC address to be copied into the ethernet header
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| 266 | * @param eth_type ethernet type (@ref lwip_ieee_eth_type)
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| 267 | * @return ERR_OK if the packet was sent, any other err_t on failure
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| 268 | */
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| 269 | err_t
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| 270 | ethernet_output(struct netif * netif, struct pbuf * p,
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| 271 | const struct eth_addr * src, const struct eth_addr * dst,
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| 272 | u16_t eth_type) {
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| 273 | struct eth_hdr *ethhdr;
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| 274 | u16_t eth_type_be = lwip_htons(eth_type);
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| 275 |
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| 276 | #if ETHARP_SUPPORT_VLAN && defined(LWIP_HOOK_VLAN_SET)
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| 277 | s32_t vlan_prio_vid = LWIP_HOOK_VLAN_SET(netif, p, src, dst, eth_type);
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| 278 | if (vlan_prio_vid >= 0) {
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| 279 | struct eth_vlan_hdr *vlanhdr;
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| 280 |
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| 281 | LWIP_ASSERT("prio_vid must be <= 0xFFFF", vlan_prio_vid <= 0xFFFF);
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| 282 |
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| 283 | if (pbuf_add_header(p, SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) != 0) {
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| 284 | goto pbuf_header_failed;
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| 285 | }
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| 286 | vlanhdr = (struct eth_vlan_hdr *)(((u8_t *)p->payload) + SIZEOF_ETH_HDR);
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| 287 | vlanhdr->tpid = eth_type_be;
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| 288 | vlanhdr->prio_vid = lwip_htons((u16_t)vlan_prio_vid);
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| 289 |
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| 290 | eth_type_be = PP_HTONS(ETHTYPE_VLAN);
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| 291 | } else
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| 292 | #endif /* ETHARP_SUPPORT_VLAN && defined(LWIP_HOOK_VLAN_SET) */
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| 293 | {
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| 294 | if (pbuf_add_header(p, SIZEOF_ETH_HDR) != 0) {
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| 295 | goto pbuf_header_failed;
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| 296 | }
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| 297 | }
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| 298 |
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| 299 | LWIP_ASSERT_CORE_LOCKED();
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| 300 |
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| 301 | ethhdr = (struct eth_hdr *)p->payload;
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| 302 | ethhdr->type = eth_type_be;
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| 303 | SMEMCPY(ðhdr->dest, dst, ETH_HWADDR_LEN);
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| 304 | SMEMCPY(ðhdr->src, src, ETH_HWADDR_LEN);
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| 305 |
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| 306 | LWIP_ASSERT("netif->hwaddr_len must be 6 for ethernet_output!",
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| 307 | (netif->hwaddr_len == ETH_HWADDR_LEN));
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| 308 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
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| 309 | ("ethernet_output: sending packet %p\n", (void *)p));
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| 310 |
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| 311 | /* send the packet */
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| 312 | return netif->linkoutput(netif, p);
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| 313 |
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| 314 | pbuf_header_failed:
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| 315 | LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS,
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| 316 | ("ethernet_output: could not allocate room for header.\n"));
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| 317 | LINK_STATS_INC(link.lenerr);
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| 318 | return ERR_BUF;
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| 319 | }
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| 320 |
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| 321 | #endif /* LWIP_ARP || LWIP_ETHERNET */
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