mirror of
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756 lines
23 KiB
C
756 lines
23 KiB
C
/**
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* pcapif.c - This file is part of lwIP pcapif
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*
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****************************************************************************
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*
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* This file is derived from an example in lwIP with the following license:
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*
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* Copyright (c) 2001, Swedish Institute of Computer Science.
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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
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "pcap.h"
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#include "lwip/opt.h"
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#if LWIP_ETHERNET
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/* @todo: once moved to the correct place, this should be unconditional! */
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#ifdef _MSC_VER
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#include "pcapif.h"
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#else
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#include "netif/pcapif.h"
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "lwip/debug.h"
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#include "lwip/def.h"
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#include "lwip/mem.h"
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#include "lwip/pbuf.h"
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#include "lwip/stats.h"
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#include "lwip/sys.h"
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#include "lwip/ip.h"
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#include "lwip/snmp.h"
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#include "lwip/tcpip.h"
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#include "lwip/timers.h"
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#include "netif/etharp.h"
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/* include the port-dependent configuration */
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#include "lwipcfg_msvc.h"
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/* For compatibility with old pcap */
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#ifndef PCAP_OPENFLAG_PROMISCUOUS
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#define PCAP_OPENFLAG_PROMISCUOUS 1
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#endif
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/* Define those to better describe your network interface.
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For now, we use 'e0', 'e1', 'e2' and so on */
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#define IFNAME0 'e'
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#define IFNAME1 '0'
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/** index of the network adapter to use for lwIP */
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#ifndef PACKET_LIB_ADAPTER_NR
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#define PACKET_LIB_ADAPTER_NR 0
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#endif
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/** If 1, check link state and report it to lwIP.
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* If 0, don't check link state (lwIP link state is always UP).
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*/
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#ifndef PCAPIF_HANDLE_LINKSTATE
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#define PCAPIF_HANDLE_LINKSTATE 1
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#endif
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#if PCAPIF_HANDLE_LINKSTATE
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#include "pcapif_helper.h"
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/* Define "PHY" delay when "link up" */
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#ifndef PCAPIF_LINKUP_DELAY
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#define PCAPIF_LINKUP_DELAY 0
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#endif
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#define PCAPIF_LINKCHECK_INTERVAL_MS 500
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/* link state notification macro */
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#if PCAPIF_LINKUP_DELAY
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#define PCAPIF_NOTIFY_LINKSTATE(netif, linkfunc) sys_timeout(PCAPIF_LINKUP_DELAY, (sys_timeout_handler)linkfunc, netif)
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#else /* PHY_LINKUP_DELAY */
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#define PCAPIF_NOTIFY_LINKSTATE(netif, linkfunc) linkfunc(netif)
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#endif /* PHY_LINKUP_DELAY */
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#endif /* PCAPIF_HANDLE_LINKSTATE */
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#define ADAPTER_NAME_LEN 128
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#define ADAPTER_DESC_LEN 128
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/* Packet Adapter informations */
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struct pcapif_private {
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void *input_fn_arg;
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pcap_t *adapter;
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char name[ADAPTER_NAME_LEN];
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char description[ADAPTER_DESC_LEN];
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int shutdown_called;
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#if PCAPIF_RX_USE_THREAD
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volatile int rx_run;
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volatile int rx_running;
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#endif /* PCAPIF_RX_USE_THREAD */
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#if PCAPIF_HANDLE_LINKSTATE
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struct pcapifh_linkstate *link_state;
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enum pcapifh_link_event last_link_event;
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#endif /* PCAPIF_HANDLE_LINKSTATE */
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};
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/* Forward declarations. */
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static void pcapif_input(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *packet);
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#ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
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/** Get the index of an adapter by its network address
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*
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* @param netaddr network address of the adapter (e.g. 192.168.1.0)
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* @return index of the adapter or negative on error
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*/
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static int
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get_adapter_index_from_addr(struct in_addr *netaddr, char *guid, size_t guid_len)
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{
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pcap_if_t *alldevs;
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pcap_if_t *d;
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char errbuf[PCAP_ERRBUF_SIZE+1];
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int index = 0;
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memset(guid, 0, guid_len);
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/* Retrieve the interfaces list */
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if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1) {
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printf("Error in pcap_findalldevs: %s\n", errbuf);
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return -1;
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}
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/* Scan the list printing every entry */
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for (d = alldevs; d != NULL; d = d->next, index++) {
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pcap_addr_t *a;
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for(a = d->addresses; a != NULL; a = a->next) {
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if (a->addr->sa_family == AF_INET) {
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ULONG a_addr = ((struct sockaddr_in *)a->addr)->sin_addr.s_addr;
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ULONG a_netmask = ((struct sockaddr_in *)a->netmask)->sin_addr.s_addr;
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ULONG a_netaddr = a_addr & a_netmask;
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ULONG addr = (*netaddr).s_addr;
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if (a_netaddr == addr) {
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int ret = -1;
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char name[128];
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char *start, *end;
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size_t len = strlen(d->name);
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if(len > 127) {
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len = 127;
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}
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memcpy(name, d->name, len);
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name[len] = 0;
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start = strstr(name, "{");
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if (start != NULL) {
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end = strstr(start, "}");
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if (end != NULL) {
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size_t len = end - start + 1;
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memcpy(guid, start, len);
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ret = index;
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}
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}
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pcap_freealldevs(alldevs);
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return ret;
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}
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}
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}
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}
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printf("Network address not found.\n");
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pcap_freealldevs(alldevs);
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return -1;
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}
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#endif /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
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#if defined(PACKET_LIB_GET_ADAPTER_NETADDRESS) || defined(PACKET_LIB_ADAPTER_GUID)
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/** Get the index of an adapter by its GUID
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*
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* @param adapter_guid GUID of the adapter
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* @return index of the adapter or negative on error
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*/
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static int
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get_adapter_index(const char* adapter_guid)
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{
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pcap_if_t *alldevs;
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pcap_if_t *d;
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char errbuf[PCAP_ERRBUF_SIZE+1];
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int idx = 0;
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/* Retrieve the interfaces list */
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if (pcap_findalldevs(&alldevs, errbuf) == -1) {
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printf("Error in pcap_findalldevs: %s\n", errbuf);
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return -1;
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}
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/* Scan the list and compare name vs. adapter_guid */
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for (d = alldevs; d != NULL; d = d->next, idx++) {
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if(strstr(d->name, adapter_guid)) {
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pcap_freealldevs(alldevs);
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return idx;
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}
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}
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/* not found, dump all adapters */
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printf("%d available adapters:\n", idx);
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for (d = alldevs, idx = 0; d != NULL; d = d->next, idx++) {
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printf("- %d: %s\n", idx, d->name);
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}
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pcap_freealldevs(alldevs);
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return -1;
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}
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#endif /* defined(PACKET_LIB_GET_ADAPTER_NETADDRESS) || defined(PACKET_LIB_ADAPTER_GUID) */
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/**
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* Open a network adapter and set it up for packet input
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*
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* @param adapter_num the index of the adapter to use
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* @param arg argument to pass to input
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* @return an adapter handle on success, NULL on failure
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*/
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static struct pcapif_private*
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pcapif_init_adapter(int adapter_num, void *arg)
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{
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int i;
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int number_of_adapters;
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struct pcapif_private *pa;
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char errbuf[PCAP_ERRBUF_SIZE+1];
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pcap_if_t *alldevs;
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pcap_if_t *d;
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pcap_if_t *used_adapter = NULL;
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pa = (struct pcapif_private *)malloc(sizeof(struct pcapif_private));
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if (!pa) {
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printf("Unable to alloc the adapter!\n");
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return NULL;
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}
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memset(pa, 0, sizeof(struct pcapif_private));
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pa->input_fn_arg = arg;
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/* Retrieve the interfaces list */
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if (pcap_findalldevs(&alldevs, errbuf) == -1) {
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free(pa);
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return NULL; /* no adapters found */
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}
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/* get number of adatpers and adapter pointer */
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for (d = alldevs, number_of_adapters = 0; d != NULL; d = d->next, number_of_adapters++) {
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if (number_of_adapters == adapter_num) {
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char *desc = d->description;
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size_t len;
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len = strlen(d->name);
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LWIP_ASSERT("len < ADAPTER_NAME_LEN", len < ADAPTER_NAME_LEN);
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strcpy(pa->name, d->name);
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used_adapter = d;
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/* format vendor description */
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if (desc != NULL) {
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len = strlen(desc);
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if (strstr(desc, " ' on local host") != NULL) {
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len -= 16;
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}
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else if (strstr(desc, "' on local host") != NULL) {
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len -= 15;
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}
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if (strstr(desc, "Network adapter '") == desc) {
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len -= 17;
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desc += 17;
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}
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len = LWIP_MIN(len, ADAPTER_DESC_LEN-1);
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strncpy(pa->description, desc, len);
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pa->description[len] = 0;
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} else {
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strcpy(pa->description, "<no_desc>");
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}
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}
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}
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#ifndef PCAPIF_LIB_QUIET
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/* Scan the list printing every entry */
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for (d = alldevs, i = 0; d != NULL; d = d->next, i++) {
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char *desc = d->description;
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char descBuf[128];
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size_t len;
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const char* devname = d->name;;
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if (d->name == NULL) {
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devname = "<unnamed>";
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} else {
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if (strstr(devname, "\\Device\\") == devname) {
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/* windows: strip the first part */
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devname += 8;
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}
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}
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printf("%2i: %s\n", i, devname);
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if (desc != NULL) {
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/* format vendor description */
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len = strlen(desc);
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if (strstr(desc, " ' on local host") != NULL) {
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len -= 16;
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}
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else if (strstr(desc, "' on local host") != NULL) {
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len -= 15;
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}
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if (strstr(desc, "Network adapter '") == desc) {
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len -= 17;
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desc += 17;
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}
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len = LWIP_MIN(len, 127);
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strncpy(descBuf, desc, len);
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descBuf[len] = 0;
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printf(" Desc: \"%s\"\n", descBuf);
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}
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}
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#endif /* PCAPIF_LIB_QUIET */
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/* invalid adapter index -> check this after printing the adapters */
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if (adapter_num < 0) {
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printf("Invalid adapter_num: %d\n", adapter_num);
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free(pa);
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pcap_freealldevs(alldevs);
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return NULL;
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}
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/* adapter index out of range */
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if (adapter_num >= number_of_adapters) {
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printf("Invalid adapter_num: %d\n", adapter_num);
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free(pa);
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pcap_freealldevs(alldevs);
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return NULL;
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}
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#ifndef PCAPIF_LIB_QUIET
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printf("Using adapter_num: %d\n", adapter_num);
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#endif /* PCAPIF_LIB_QUIET */
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/* set up the selected adapter */
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LWIP_ASSERT("used_adapter != NULL", used_adapter != NULL);
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/* Open the device */
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pa->adapter = pcap_open_live(used_adapter->name,/* name of the device */
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65536, /* portion of the packet to capture */
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/* 65536 guarantees that the whole packet will be captured on all the link layers */
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PCAP_OPENFLAG_PROMISCUOUS,/* promiscuous mode */
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#if PCAPIF_RX_USE_THREAD
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/*-*/1, /* don't wait at all for lower latency */
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#else
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1, /* wait 1 ms in ethernetif_poll */
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#endif
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errbuf); /* error buffer */
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if (pa->adapter == NULL) {
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printf("\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);
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/* Free the device list */
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pcap_freealldevs(alldevs);
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free(pa);
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return NULL;
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}
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printf("Using adapter: \"%s\"\n", pa->description);
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pcap_freealldevs(alldevs);
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#if PCAPIF_HANDLE_LINKSTATE
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pa->link_state = pcapifh_linkstate_init(pa->name);
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pa->last_link_event = PCAPIF_LINKEVENT_UNKNOWN;
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#endif /* PCAPIF_HANDLE_LINKSTATE */
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return pa;
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}
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#if PCAPIF_HANDLE_LINKSTATE
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void
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pcapif_check_linkstate(void *netif)
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{
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struct pcapif_private *pa = (struct pcapif_private*)((struct netif *)netif)->state;
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enum pcapifh_link_event le;
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le = pcapifh_linkstate_get(pa->link_state);
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if (pa->last_link_event != le) {
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pa->last_link_event = le;
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switch (le) {
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case PCAPIF_LINKEVENT_UP: {
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PCAPIF_NOTIFY_LINKSTATE(netif, netif_set_link_up);
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break;
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}
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case PCAPIF_LINKEVENT_DOWN: {
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PCAPIF_NOTIFY_LINKSTATE(netif, netif_set_link_down);
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break;
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}
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}
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}
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sys_timeout(PCAPIF_LINKCHECK_INTERVAL_MS, pcapif_check_linkstate, netif);
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}
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#endif /* PCAPIF_HANDLE_LINKSTATE */
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/**
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* Close the adapter (no more packets can be sent or received)
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*
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* @param netif netif to shutdown
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*/
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void
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pcapif_shutdown(struct netif *netif)
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{
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struct pcapif_private *pa = (struct pcapif_private*)netif->state;
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if (pa) {
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#if PCAPIF_RX_USE_THREAD
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pa->rx_run = 0;
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#endif /* PCAPIF_RX_USE_THREAD */
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if (pa->adapter) {
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pcap_breakloop(pa->adapter);
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pcap_close(pa->adapter);
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}
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#if PCAPIF_RX_USE_THREAD
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/* wait for rxthread to end */
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while(pa->rx_running);
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#endif /* PCAPIF_RX_USE_THREAD */
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#if PCAPIF_HANDLE_LINKSTATE
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pcapifh_linkstate_close(pa->link_state);
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#endif /* PCAPIF_HANDLE_LINKSTATE */
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free(pa);
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}
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}
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#if PCAPIF_RX_USE_THREAD
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/** RX running in its own thread */
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static void
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pcapif_input_thread(void *arg)
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{
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struct netif *netif = (struct netif *)arg;
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struct pcapif_private *pa = (struct pcapif_private*)netif->state;
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int ret;
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do
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{
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ret = pcap_loop(pa->adapter, -1, pcapif_input, (u_char*)pa);
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if (ret < 0)
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{
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sys_msleep(1);
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}
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} while (pa->rx_run);
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pa->rx_running = 0;
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}
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#endif /* PCAPIF_RX_USE_THREAD */
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/** Low-level initialization: find the correct adapter and initialize it.
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*/
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static void
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pcapif_low_level_init(struct netif *netif)
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{
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u8_t my_mac_addr[ETHARP_HWADDR_LEN] = LWIP_MAC_ADDR_BASE;
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int adapter_num = PACKET_LIB_ADAPTER_NR;
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struct pcapif_private *pa;
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#ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
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ip_addr_t netaddr;
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#define GUID_LEN 128
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char guid[GUID_LEN + 1];
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memset(&guid, 0, sizeof(guid));
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PACKET_LIB_GET_ADAPTER_NETADDRESS(&netaddr);
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if (get_adapter_index_from_addr((struct in_addr *)&netaddr, guid, GUID_LEN) < 0) {
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printf("ERROR initializing network adapter, failed to get GUID for network address %s\n", ip_ntoa(&netaddr));
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LWIP_ASSERT("ERROR initializing network adapter, failed to get GUID for network address!", 0);
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return;
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}
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adapter_num = get_adapter_index(guid);
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if (adapter_num < 0) {
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printf("ERROR finding network adapter with GUID \"%s\"!\n", guid);
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LWIP_ASSERT("ERROR finding network adapter with expected GUID!", 0);
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return;
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}
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#else /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
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#ifdef PACKET_LIB_ADAPTER_GUID
|
|
/* get adapter index for guid string */
|
|
adapter_num = get_adapter_index(PACKET_LIB_ADAPTER_GUID);
|
|
if (adapter_num < 0) {
|
|
printf("ERROR finding network adapter with GUID \"%s\"!\n", PACKET_LIB_ADAPTER_GUID);
|
|
LWIP_ASSERT("ERROR initializing network adapter!\n", 0);
|
|
return;
|
|
}
|
|
#endif /* PACKET_LIB_ADAPTER_GUID */
|
|
#endif /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
|
|
|
|
/* Do whatever else is needed to initialize interface. */
|
|
pa = pcapif_init_adapter(adapter_num, netif);
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|
if (pa == NULL) {
|
|
printf("ERROR initializing network adapter %d!\n", PACKET_LIB_ADAPTER_NR);
|
|
LWIP_ASSERT("ERROR initializing network adapter!", 0);
|
|
return;
|
|
}
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|
netif->state = pa;
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|
|
|
/* change the MAC address to a unique value
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|
so that multiple ethernetifs are supported */
|
|
/* @todo: this does NOT support multiple processes using this adapter! */
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my_mac_addr[ETHARP_HWADDR_LEN - 1] += netif->num;
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|
/* Copy MAC addr */
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|
memcpy(&netif->hwaddr, my_mac_addr, ETHARP_HWADDR_LEN);
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|
|
|
/* get the initial link state of the selected interface */
|
|
#if PCAPIF_HANDLE_LINKSTATE
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|
pa->last_link_event = pcapifh_linkstate_get(pa->link_state);
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|
if (pa->last_link_event == PCAPIF_LINKEVENT_DOWN) {
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netif_set_link_down(netif);
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|
} else {
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|
netif_set_link_up(netif);
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|
}
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|
sys_timeout(PCAPIF_LINKCHECK_INTERVAL_MS, pcapif_check_linkstate, netif);
|
|
#endif /* PCAPIF_HANDLE_LINKSTATE */
|
|
|
|
#if PCAPIF_RX_USE_THREAD
|
|
pa->rx_run = 1;
|
|
pa->rx_running = 1;
|
|
sys_thread_new("pktif_rxthread", pcapif_input_thread, netif, 0, 0);
|
|
#endif
|
|
|
|
LWIP_DEBUGF(NETIF_DEBUG, ("pktif: eth_addr %02X%02X%02X%02X%02X%02X\n",netif->hwaddr[0],netif->hwaddr[1],netif->hwaddr[2],netif->hwaddr[3],netif->hwaddr[4],netif->hwaddr[5]));
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|
}
|
|
|
|
/** low_level_output():
|
|
* Transmit a packet. The packet is contained in the pbuf that is passed to
|
|
* the function. This pbuf might be chained.
|
|
*/
|
|
static err_t
|
|
pcapif_low_level_output(struct netif *netif, struct pbuf *p)
|
|
{
|
|
struct pbuf *q;
|
|
unsigned char buffer[1520];
|
|
unsigned char *buf = buffer;
|
|
unsigned char *ptr;
|
|
struct eth_hdr *ethhdr;
|
|
u16_t tot_len = p->tot_len - ETH_PAD_SIZE;
|
|
struct pcapif_private *pa = (struct pcapif_private*)netif->state;
|
|
|
|
#if defined(LWIP_DEBUG) && LWIP_NETIF_TX_SINGLE_PBUF
|
|
LWIP_ASSERT("p->next == NULL && p->len == p->tot_len", p->next == NULL && p->len == p->tot_len);
|
|
#endif
|
|
|
|
/* initiate transfer */
|
|
if (p->len == p->tot_len) {
|
|
/* no pbuf chain, don't have to copy -> faster */
|
|
buf = &((unsigned char*)p->payload)[ETH_PAD_SIZE];
|
|
} else {
|
|
/* pbuf chain, copy into contiguous buffer */
|
|
if (p->tot_len >= sizeof(buffer)) {
|
|
LINK_STATS_INC(link.lenerr);
|
|
LINK_STATS_INC(link.drop);
|
|
snmp_inc_ifoutdiscards(netif);
|
|
return ERR_BUF;
|
|
}
|
|
ptr = buffer;
|
|
for(q = p; q != NULL; q = q->next) {
|
|
/* Send the data from the pbuf to the interface, one pbuf at a
|
|
time. The size of the data in each pbuf is kept in the ->len
|
|
variable. */
|
|
/* send data from(q->payload, q->len); */
|
|
LWIP_DEBUGF(NETIF_DEBUG, ("netif: send ptr %p q->payload %p q->len %i q->next %p\n", ptr, q->payload, (int)q->len, (void*)q->next));
|
|
if (q == p) {
|
|
memcpy(ptr, &((char*)q->payload)[ETH_PAD_SIZE], q->len - ETH_PAD_SIZE);
|
|
ptr += q->len - ETH_PAD_SIZE;
|
|
} else {
|
|
memcpy(ptr, q->payload, q->len);
|
|
ptr += q->len;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* signal that packet should be sent */
|
|
if (pcap_sendpacket(pa->adapter, buf, tot_len) < 0) {
|
|
LINK_STATS_INC(link.memerr);
|
|
LINK_STATS_INC(link.drop);
|
|
snmp_inc_ifoutdiscards(netif);
|
|
return ERR_BUF;
|
|
}
|
|
|
|
LINK_STATS_INC(link.xmit);
|
|
snmp_add_ifoutoctets(netif, tot_len);
|
|
ethhdr = (struct eth_hdr *)p->payload;
|
|
if ((ethhdr->dest.addr[0] & 1) != 0) {
|
|
/* broadcast or multicast packet*/
|
|
snmp_inc_ifoutnucastpkts(netif);
|
|
} else {
|
|
/* unicast packet */
|
|
snmp_inc_ifoutucastpkts(netif);
|
|
}
|
|
return ERR_OK;
|
|
}
|
|
|
|
/** low_level_input(): Allocate a pbuf and transfer the bytes of the incoming
|
|
* packet from the interface into the pbuf.
|
|
*/
|
|
static struct pbuf *
|
|
pcapif_low_level_input(struct netif *netif, const void *packet, int packet_len)
|
|
{
|
|
struct pbuf *p, *q;
|
|
int start;
|
|
int length = packet_len;
|
|
struct eth_addr *dest = (struct eth_addr*)packet;
|
|
struct eth_addr *src = dest + 1;
|
|
int unicast;
|
|
|
|
/* MAC filter: only let my MAC or non-unicast through (pcap receives loopback traffic, too) */
|
|
unicast = ((dest->addr[0] & 0x01) == 0);
|
|
if (((memcmp(dest, &netif->hwaddr, ETHARP_HWADDR_LEN)) && unicast) ||
|
|
/* and don't let feedback packets through (limitation in winpcap?) */
|
|
(!memcmp(src, netif->hwaddr, ETHARP_HWADDR_LEN))) {
|
|
/* don't update counters here! */
|
|
return NULL;
|
|
}
|
|
|
|
/* We allocate a pbuf chain of pbufs from the pool. */
|
|
p = pbuf_alloc(PBUF_RAW, (u16_t)length + ETH_PAD_SIZE, PBUF_POOL);
|
|
LWIP_DEBUGF(NETIF_DEBUG, ("netif: recv length %i p->tot_len %i\n", length, (int)p->tot_len));
|
|
|
|
if (p != NULL) {
|
|
/* We iterate over the pbuf chain until we have read the entire
|
|
packet into the pbuf. */
|
|
start=0;
|
|
for (q = p; q != NULL; q = q->next) {
|
|
u16_t copy_len = q->len;
|
|
/* Read enough bytes to fill this pbuf in the chain. The
|
|
available data in the pbuf is given by the q->len
|
|
variable. */
|
|
/* read data into(q->payload, q->len); */
|
|
LWIP_DEBUGF(NETIF_DEBUG, ("netif: recv start %i length %i q->payload %p q->len %i q->next %p\n", start, length, q->payload, (int)q->len, (void*)q->next));
|
|
if (q == p) {
|
|
#if ETH_PAD_SIZE
|
|
LWIP_ASSERT("q->len >= ETH_PAD_SIZE", q->len >= ETH_PAD_SIZE);
|
|
copy_len -= ETH_PAD_SIZE;
|
|
#endif /* ETH_PAD_SIZE*/
|
|
memcpy(&((char*)q->payload)[ETH_PAD_SIZE], &((char*)packet)[start], copy_len);
|
|
} else {
|
|
memcpy(q->payload, &((char*)packet)[start], copy_len);
|
|
}
|
|
start += copy_len;
|
|
length -= copy_len;
|
|
if (length <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
LINK_STATS_INC(link.recv);
|
|
snmp_add_ifinoctets(netif, p->tot_len);
|
|
if (unicast) {
|
|
snmp_inc_ifinucastpkts(netif);
|
|
} else {
|
|
snmp_inc_ifinnucastpkts(netif);
|
|
}
|
|
} else {
|
|
/* drop packet(); */
|
|
LINK_STATS_INC(link.memerr);
|
|
LINK_STATS_INC(link.drop);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
/** pcapif_input: This function is called when a packet is ready to be read
|
|
* from the interface. It uses the function low_level_input() that should
|
|
* handle the actual reception of bytes from the network interface.
|
|
*/
|
|
static void
|
|
pcapif_input(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *packet)
|
|
{
|
|
struct pcapif_private *pa = (struct pcapif_private*)user;
|
|
int packet_len = pkt_header->caplen;
|
|
struct netif *netif = (struct netif *)pa->input_fn_arg;
|
|
struct pbuf *p;
|
|
|
|
/* move received packet into a new pbuf */
|
|
p = pcapif_low_level_input(netif, packet, packet_len);
|
|
/* no packet could be read, silently ignore this */
|
|
if (p != NULL) {
|
|
/* pass all packets to ethernet_input, which decides what packets it supports */
|
|
if (netif->input(p, netif) != ERR_OK) {
|
|
LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
|
|
pbuf_free(p);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pcapif_init(): initialization function, pass to netif_add().
|
|
*/
|
|
err_t
|
|
pcapif_init(struct netif *netif)
|
|
{
|
|
static int ethernetif_index;
|
|
|
|
int local_index;
|
|
SYS_ARCH_DECL_PROTECT(lev);
|
|
SYS_ARCH_PROTECT(lev);
|
|
local_index = ethernetif_index++;
|
|
SYS_ARCH_UNPROTECT(lev);
|
|
|
|
netif->name[0] = IFNAME0;
|
|
netif->name[1] = (char)(IFNAME1 + local_index);
|
|
netif->linkoutput = pcapif_low_level_output;
|
|
#if LWIP_ARP
|
|
netif->output = etharp_output;
|
|
#else /* LWIP_ARP */
|
|
netif->output = NULL; /* not used for PPPoE */
|
|
#endif /* LWIP_ARP */
|
|
#if LWIP_NETIF_HOSTNAME
|
|
/* Initialize interface hostname */
|
|
netif_set_hostname(netif, "lwip");
|
|
#endif /* LWIP_NETIF_HOSTNAME */
|
|
|
|
netif->mtu = 1500;
|
|
netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_IGMP;
|
|
netif->hwaddr_len = ETHARP_HWADDR_LEN;
|
|
|
|
NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, 100000000);
|
|
|
|
/* sets link up or down based on current status */
|
|
pcapif_low_level_init(netif);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
#if !PCAPIF_RX_USE_THREAD
|
|
void
|
|
pcapif_poll(struct netif *netif)
|
|
{
|
|
struct pcapif_private *pa = (struct pcapif_private*)netif->state;
|
|
|
|
int ret;
|
|
do
|
|
{
|
|
ret = pcap_dispatch(pa->adapter, -1, pcapif_input, (u_char*)pa);
|
|
} while(ret > 0);
|
|
|
|
}
|
|
#endif /* !PCAPIF_RX_USE_THREAD */
|
|
|
|
#endif /* LWIP_ETHERNET */
|