mirror of
https://github.com/espressif/esp-idf.git
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223 lines
8.0 KiB
C
223 lines
8.0 KiB
C
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/**
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* @file
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* Ethernet common functions
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*/
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/*
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* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
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* Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
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* Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_ARP || LWIP_ETHERNET
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#include "netif/ethernet.h"
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#include "lwip/def.h"
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#include "lwip/stats.h"
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#include "netif/etharp.h"
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#include "lwip/ip.h"
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#include "lwip/snmp.h"
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#include <string.h>
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#if PPPOE_SUPPORT
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#include "netif/ppp/pppoe.h"
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#endif /* PPPOE_SUPPORT */
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const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
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const struct eth_addr ethzero = {{0,0,0,0,0,0}};
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/**
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* Process received ethernet frames. Using this function instead of directly
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* calling ip_input and passing ARP frames through etharp in ethernetif_input,
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* the ARP cache is protected from concurrent access.
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*
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* @param p the received packet, p->payload pointing to the ethernet header
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* @param netif the network interface on which the packet was received
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*/
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err_t
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ethernet_input(struct pbuf *p, struct netif *netif)
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{
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struct eth_hdr* ethhdr;
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u16_t type;
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#if LWIP_ARP || ETHARP_SUPPORT_VLAN || LWIP_IPV6
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s16_t ip_hdr_offset = SIZEOF_ETH_HDR;
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#endif /* LWIP_ARP || ETHARP_SUPPORT_VLAN */
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if (p->len <= SIZEOF_ETH_HDR) {
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/* a packet with only an ethernet header (or less) is not valid for us */
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ETHARP_STATS_INC(etharp.proterr);
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ETHARP_STATS_INC(etharp.drop);
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MIB2_STATS_NETIF_INC(netif, ifinerrors);
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goto free_and_return;
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}
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/* points to packet payload, which starts with an Ethernet header */
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ethhdr = (struct eth_hdr *)p->payload;
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LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE,
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("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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(unsigned)ethhdr->dest.addr[0], (unsigned)ethhdr->dest.addr[1], (unsigned)ethhdr->dest.addr[2],
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(unsigned)ethhdr->dest.addr[3], (unsigned)ethhdr->dest.addr[4], (unsigned)ethhdr->dest.addr[5],
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(unsigned)ethhdr->src.addr[0], (unsigned)ethhdr->src.addr[1], (unsigned)ethhdr->src.addr[2],
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(unsigned)ethhdr->src.addr[3], (unsigned)ethhdr->src.addr[4], (unsigned)ethhdr->src.addr[5],
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(unsigned)htons(ethhdr->type)));
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type = ethhdr->type;
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#if ETHARP_SUPPORT_VLAN
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if (type == PP_HTONS(ETHTYPE_VLAN)) {
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struct eth_vlan_hdr *vlan = (struct eth_vlan_hdr*)(((char*)ethhdr) + SIZEOF_ETH_HDR);
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if (p->len <= SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR) {
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/* a packet with only an ethernet/vlan header (or less) is not valid for us */
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ETHARP_STATS_INC(etharp.proterr);
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ETHARP_STATS_INC(etharp.drop);
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MIB2_STATS_NETIF_INC(netif, ifinerrors);
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goto free_and_return;
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}
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#if defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) /* if not, allow all VLANs */
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#ifdef LWIP_HOOK_VLAN_CHECK
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if (!LWIP_HOOK_VLAN_CHECK(netif, ethhdr, vlan)) {
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#elif defined(ETHARP_VLAN_CHECK_FN)
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if (!ETHARP_VLAN_CHECK_FN(ethhdr, vlan)) {
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#elif defined(ETHARP_VLAN_CHECK)
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if (VLAN_ID(vlan) != ETHARP_VLAN_CHECK) {
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#endif
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/* silently ignore this packet: not for our VLAN */
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pbuf_free(p);
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return ERR_OK;
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}
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#endif /* defined(LWIP_HOOK_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK) || defined(ETHARP_VLAN_CHECK_FN) */
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type = vlan->tpid;
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ip_hdr_offset = SIZEOF_ETH_HDR + SIZEOF_VLAN_HDR;
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}
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#endif /* ETHARP_SUPPORT_VLAN */
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#if LWIP_ARP_FILTER_NETIF
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netif = LWIP_ARP_FILTER_NETIF_FN(p, netif, htons(type));
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#endif /* LWIP_ARP_FILTER_NETIF*/
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if (ethhdr->dest.addr[0] & 1) {
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/* this might be a multicast or broadcast packet */
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if (ethhdr->dest.addr[0] == LL_IP4_MULTICAST_ADDR_0) {
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#if LWIP_IPV4
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if ((ethhdr->dest.addr[1] == LL_IP4_MULTICAST_ADDR_1) &&
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(ethhdr->dest.addr[2] == LL_IP4_MULTICAST_ADDR_2)) {
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/* mark the pbuf as link-layer multicast */
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p->flags |= PBUF_FLAG_LLMCAST;
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}
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#endif /* LWIP_IPV4 */
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}
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#if LWIP_IPV6
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else if ((ethhdr->dest.addr[0] == LL_IP6_MULTICAST_ADDR_0) &&
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(ethhdr->dest.addr[1] == LL_IP6_MULTICAST_ADDR_1)) {
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/* mark the pbuf as link-layer multicast */
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p->flags |= PBUF_FLAG_LLMCAST;
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}
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#endif /* LWIP_IPV6 */
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else if (eth_addr_cmp(ðhdr->dest, ðbroadcast)) {
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/* mark the pbuf as link-layer broadcast */
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p->flags |= PBUF_FLAG_LLBCAST;
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}
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}
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switch (type) {
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#if LWIP_IPV4 && LWIP_ARP
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/* IP packet? */
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case PP_HTONS(ETHTYPE_IP):
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if (!(netif->flags & NETIF_FLAG_ETHARP)) {
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goto free_and_return;
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}
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#if ETHARP_TRUST_IP_MAC
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/* update ARP table */
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etharp_ip_input(netif, p);
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#endif /* ETHARP_TRUST_IP_MAC */
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/* skip Ethernet header */
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if ((p->len < ip_hdr_offset) || pbuf_header(p, (s16_t)-ip_hdr_offset)) {
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LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
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("ethernet_input: IPv4 packet dropped, too short (%"S16_F"/%"S16_F")\n",
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p->tot_len, ip_hdr_offset));
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LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE, ("Can't move over header in packet"));
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goto free_and_return;
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} else {
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/* pass to IP layer */
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ip4_input(p, netif);
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}
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break;
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case PP_HTONS(ETHTYPE_ARP):
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if (!(netif->flags & NETIF_FLAG_ETHARP)) {
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goto free_and_return;
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}
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/* pass p to ARP module */
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etharp_arp_input(netif, (struct eth_addr*)(netif->hwaddr), p);
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break;
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#endif /* LWIP_IPV4 && LWIP_ARP */
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#if PPPOE_SUPPORT
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case PP_HTONS(ETHTYPE_PPPOEDISC): /* PPP Over Ethernet Discovery Stage */
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pppoe_disc_input(netif, p);
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break;
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case PP_HTONS(ETHTYPE_PPPOE): /* PPP Over Ethernet Session Stage */
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pppoe_data_input(netif, p);
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break;
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#endif /* PPPOE_SUPPORT */
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#if LWIP_IPV6
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case PP_HTONS(ETHTYPE_IPV6): /* IPv6 */
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/* skip Ethernet header */
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if ((p->len < ip_hdr_offset) || pbuf_header(p, (s16_t)-ip_hdr_offset)) {
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LWIP_DEBUGF(ETHARP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING,
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("ethernet_input: IPv6 packet dropped, too short (%"S16_F"/%"S16_F")\n",
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p->tot_len, ip_hdr_offset));
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goto free_and_return;
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} else {
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/* pass to IPv6 layer */
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ip6_input(p, netif);
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}
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break;
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#endif /* LWIP_IPV6 */
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default:
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ETHARP_STATS_INC(etharp.proterr);
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ETHARP_STATS_INC(etharp.drop);
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MIB2_STATS_NETIF_INC(netif, ifinunknownprotos);
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goto free_and_return;
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}
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/* This means the pbuf is freed or consumed,
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so the caller doesn't have to free it again */
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return ERR_OK;
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free_and_return:
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pbuf_free(p);
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return ERR_OK;
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}
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#endif /* LWIP_ARP || LWIP_ETHERNET */
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