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lwip-contrib-mac/ports/win32/pcapif.c

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/**
* pcapif.c - This file is part of lwIP pcapif
*
****************************************************************************
*
* This file is derived from an example in lwIP with the following license:
*
* Copyright (c) 2001, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include "pcap.h"
#include "lwip/opt.h"
#if LWIP_ETHERNET
/* @todo: once moved to the correct place, this should be unconditional! */
#ifdef _MSC_VER
#include "pcapif.h"
#else
#include "netif/pcapif.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "lwip/debug.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/stats.h"
#include "lwip/sys.h"
#include "lwip/ip.h"
#include "lwip/snmp.h"
#include "lwip/tcpip.h"
#include "lwip/timers.h"
#include "lwip/ethip6.h"
#include "netif/etharp.h"
/* include the port-dependent configuration */
#include "lwipcfg_msvc.h"
/* For compatibility with old pcap */
#ifndef PCAP_OPENFLAG_PROMISCUOUS
#define PCAP_OPENFLAG_PROMISCUOUS 1
#endif
/* Define those to better describe your network interface.
For now, we use 'e0', 'e1', 'e2' and so on */
#define IFNAME0 'e'
#define IFNAME1 '0'
/** index of the network adapter to use for lwIP */
#ifndef PACKET_LIB_ADAPTER_NR
#define PACKET_LIB_ADAPTER_NR 0
#endif
/** If 1, check link state and report it to lwIP.
* If 0, don't check link state (lwIP link state is always UP).
*/
#ifndef PCAPIF_HANDLE_LINKSTATE
#define PCAPIF_HANDLE_LINKSTATE 1
#endif
#if PCAPIF_HANDLE_LINKSTATE
#include "pcapif_helper.h"
/* Define "PHY" delay when "link up" */
#ifndef PCAPIF_LINKUP_DELAY
#define PCAPIF_LINKUP_DELAY 0
#endif
#define PCAPIF_LINKCHECK_INTERVAL_MS 500
/* link state notification macro */
#if PCAPIF_LINKUP_DELAY
#define PCAPIF_NOTIFY_LINKSTATE(netif, linkfunc) sys_timeout(PCAPIF_LINKUP_DELAY, (sys_timeout_handler)linkfunc, netif)
#else /* PHY_LINKUP_DELAY */
#define PCAPIF_NOTIFY_LINKSTATE(netif, linkfunc) linkfunc(netif)
#endif /* PHY_LINKUP_DELAY */
#endif /* PCAPIF_HANDLE_LINKSTATE */
#define ADAPTER_NAME_LEN 128
#define ADAPTER_DESC_LEN 128
/* Packet Adapter informations */
struct pcapif_private {
void *input_fn_arg;
pcap_t *adapter;
char name[ADAPTER_NAME_LEN];
char description[ADAPTER_DESC_LEN];
int shutdown_called;
#if PCAPIF_RX_USE_THREAD
volatile int rx_run;
volatile int rx_running;
#endif /* PCAPIF_RX_USE_THREAD */
#if PCAPIF_HANDLE_LINKSTATE
struct pcapifh_linkstate *link_state;
enum pcapifh_link_event last_link_event;
#endif /* PCAPIF_HANDLE_LINKSTATE */
};
/* Forward declarations. */
static void pcapif_input(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *packet);
#ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
/** Get the index of an adapter by its network address
*
* @param netaddr network address of the adapter (e.g. 192.168.1.0)
* @return index of the adapter or negative on error
*/
static int
get_adapter_index_from_addr(struct in_addr *netaddr, char *guid, size_t guid_len)
{
pcap_if_t *alldevs;
pcap_if_t *d;
char errbuf[PCAP_ERRBUF_SIZE+1];
int index = 0;
memset(guid, 0, guid_len);
/* Retrieve the interfaces list */
if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1) {
printf("Error in pcap_findalldevs: %s\n", errbuf);
return -1;
}
/* Scan the list printing every entry */
for (d = alldevs; d != NULL; d = d->next, index++) {
pcap_addr_t *a;
for(a = d->addresses; a != NULL; a = a->next) {
if (a->addr->sa_family == AF_INET) {
ULONG a_addr = ((struct sockaddr_in *)a->addr)->sin_addr.s_addr;
ULONG a_netmask = ((struct sockaddr_in *)a->netmask)->sin_addr.s_addr;
ULONG a_netaddr = a_addr & a_netmask;
ULONG addr = (*netaddr).s_addr;
if (a_netaddr == addr) {
int ret = -1;
char name[128];
char *start, *end;
size_t len = strlen(d->name);
if(len > 127) {
len = 127;
}
memcpy(name, d->name, len);
name[len] = 0;
start = strstr(name, "{");
if (start != NULL) {
end = strstr(start, "}");
if (end != NULL) {
size_t len = end - start + 1;
memcpy(guid, start, len);
ret = index;
}
}
pcap_freealldevs(alldevs);
return ret;
}
}
}
}
printf("Network address not found.\n");
pcap_freealldevs(alldevs);
return -1;
}
#endif /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
#if defined(PACKET_LIB_GET_ADAPTER_NETADDRESS) || defined(PACKET_LIB_ADAPTER_GUID)
/** Get the index of an adapter by its GUID
*
* @param adapter_guid GUID of the adapter
* @return index of the adapter or negative on error
*/
static int
get_adapter_index(const char* adapter_guid)
{
pcap_if_t *alldevs;
pcap_if_t *d;
char errbuf[PCAP_ERRBUF_SIZE+1];
int idx = 0;
/* Retrieve the interfaces list */
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
printf("Error in pcap_findalldevs: %s\n", errbuf);
return -1;
}
/* Scan the list and compare name vs. adapter_guid */
for (d = alldevs; d != NULL; d = d->next, idx++) {
if(strstr(d->name, adapter_guid)) {
pcap_freealldevs(alldevs);
return idx;
}
}
/* not found, dump all adapters */
printf("%d available adapters:\n", idx);
for (d = alldevs, idx = 0; d != NULL; d = d->next, idx++) {
printf("- %d: %s\n", idx, d->name);
}
pcap_freealldevs(alldevs);
return -1;
}
#endif /* defined(PACKET_LIB_GET_ADAPTER_NETADDRESS) || defined(PACKET_LIB_ADAPTER_GUID) */
/**
* Open a network adapter and set it up for packet input
*
* @param adapter_num the index of the adapter to use
* @param arg argument to pass to input
* @return an adapter handle on success, NULL on failure
*/
static struct pcapif_private*
pcapif_init_adapter(int adapter_num, void *arg)
{
int i;
int number_of_adapters;
struct pcapif_private *pa;
char errbuf[PCAP_ERRBUF_SIZE+1];
pcap_if_t *alldevs;
pcap_if_t *d;
pcap_if_t *used_adapter = NULL;
pa = (struct pcapif_private *)malloc(sizeof(struct pcapif_private));
if (!pa) {
printf("Unable to alloc the adapter!\n");
return NULL;
}
memset(pa, 0, sizeof(struct pcapif_private));
pa->input_fn_arg = arg;
/* Retrieve the interfaces list */
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
free(pa);
return NULL; /* no adapters found */
}
/* get number of adatpers and adapter pointer */
for (d = alldevs, number_of_adapters = 0; d != NULL; d = d->next, number_of_adapters++) {
if (number_of_adapters == adapter_num) {
char *desc = d->description;
size_t len;
len = strlen(d->name);
LWIP_ASSERT("len < ADAPTER_NAME_LEN", len < ADAPTER_NAME_LEN);
strcpy(pa->name, d->name);
used_adapter = d;
/* format vendor description */
if (desc != NULL) {
len = strlen(desc);
if (strstr(desc, " ' on local host") != NULL) {
len -= 16;
}
else if (strstr(desc, "' on local host") != NULL) {
len -= 15;
}
if (strstr(desc, "Network adapter '") == desc) {
len -= 17;
desc += 17;
}
len = LWIP_MIN(len, ADAPTER_DESC_LEN-1);
strncpy(pa->description, desc, len);
pa->description[len] = 0;
} else {
strcpy(pa->description, "<no_desc>");
}
}
}
#ifndef PCAPIF_LIB_QUIET
/* Scan the list printing every entry */
for (d = alldevs, i = 0; d != NULL; d = d->next, i++) {
char *desc = d->description;
char descBuf[128];
size_t len;
const char* devname = d->name;;
if (d->name == NULL) {
devname = "<unnamed>";
} else {
if (strstr(devname, "\\Device\\") == devname) {
/* windows: strip the first part */
devname += 8;
}
}
printf("%2i: %s\n", i, devname);
if (desc != NULL) {
/* format vendor description */
len = strlen(desc);
if (strstr(desc, " ' on local host") != NULL) {
len -= 16;
}
else if (strstr(desc, "' on local host") != NULL) {
len -= 15;
}
if (strstr(desc, "Network adapter '") == desc) {
len -= 17;
desc += 17;
}
len = LWIP_MIN(len, 127);
strncpy(descBuf, desc, len);
descBuf[len] = 0;
printf(" Desc: \"%s\"\n", descBuf);
}
}
#endif /* PCAPIF_LIB_QUIET */
/* invalid adapter index -> check this after printing the adapters */
if (adapter_num < 0) {
printf("Invalid adapter_num: %d\n", adapter_num);
free(pa);
pcap_freealldevs(alldevs);
return NULL;
}
/* adapter index out of range */
if (adapter_num >= number_of_adapters) {
printf("Invalid adapter_num: %d\n", adapter_num);
free(pa);
pcap_freealldevs(alldevs);
return NULL;
}
#ifndef PCAPIF_LIB_QUIET
printf("Using adapter_num: %d\n", adapter_num);
#endif /* PCAPIF_LIB_QUIET */
/* set up the selected adapter */
LWIP_ASSERT("used_adapter != NULL", used_adapter != NULL);
/* Open the device */
pa->adapter = pcap_open_live(used_adapter->name,/* name of the device */
65536, /* portion of the packet to capture */
/* 65536 guarantees that the whole packet will be captured on all the link layers */
PCAP_OPENFLAG_PROMISCUOUS,/* promiscuous mode */
#if PCAPIF_RX_USE_THREAD
/*-*/1, /* don't wait at all for lower latency */
#else
1, /* wait 1 ms in ethernetif_poll */
#endif
errbuf); /* error buffer */
if (pa->adapter == NULL) {
printf("\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);
/* Free the device list */
pcap_freealldevs(alldevs);
free(pa);
return NULL;
}
printf("Using adapter: \"%s\"\n", pa->description);
pcap_freealldevs(alldevs);
#if PCAPIF_HANDLE_LINKSTATE
pa->link_state = pcapifh_linkstate_init(pa->name);
pa->last_link_event = PCAPIF_LINKEVENT_UNKNOWN;
#endif /* PCAPIF_HANDLE_LINKSTATE */
return pa;
}
#if PCAPIF_HANDLE_LINKSTATE
void
pcapif_check_linkstate(void *netif)
{
struct pcapif_private *pa = (struct pcapif_private*)((struct netif *)netif)->state;
enum pcapifh_link_event le;
le = pcapifh_linkstate_get(pa->link_state);
if (pa->last_link_event != le) {
pa->last_link_event = le;
switch (le) {
case PCAPIF_LINKEVENT_UP: {
PCAPIF_NOTIFY_LINKSTATE(netif, netif_set_link_up);
break;
}
case PCAPIF_LINKEVENT_DOWN: {
PCAPIF_NOTIFY_LINKSTATE(netif, netif_set_link_down);
break;
}
}
}
sys_timeout(PCAPIF_LINKCHECK_INTERVAL_MS, pcapif_check_linkstate, netif);
}
#endif /* PCAPIF_HANDLE_LINKSTATE */
/**
* Close the adapter (no more packets can be sent or received)
*
* @param netif netif to shutdown
*/
void
pcapif_shutdown(struct netif *netif)
{
struct pcapif_private *pa = (struct pcapif_private*)netif->state;
if (pa) {
#if PCAPIF_RX_USE_THREAD
pa->rx_run = 0;
#endif /* PCAPIF_RX_USE_THREAD */
if (pa->adapter) {
pcap_breakloop(pa->adapter);
pcap_close(pa->adapter);
}
#if PCAPIF_RX_USE_THREAD
/* wait for rxthread to end */
while(pa->rx_running);
#endif /* PCAPIF_RX_USE_THREAD */
#if PCAPIF_HANDLE_LINKSTATE
pcapifh_linkstate_close(pa->link_state);
#endif /* PCAPIF_HANDLE_LINKSTATE */
free(pa);
}
}
#if PCAPIF_RX_USE_THREAD
/** RX running in its own thread */
static void
pcapif_input_thread(void *arg)
{
struct netif *netif = (struct netif *)arg;
struct pcapif_private *pa = (struct pcapif_private*)netif->state;
do
{
struct pcap_pkthdr pkt_header;
const u_char *packet = pcap_next(pa->adapter, &pkt_header);
if(packet != NULL) {
pcapif_input((u_char*)pa, &pkt_header, packet);
}
} while (pa->rx_run);
pa->rx_running = 0;
}
#endif /* PCAPIF_RX_USE_THREAD */
/** Low-level initialization: find the correct adapter and initialize it.
*/
static void
pcapif_low_level_init(struct netif *netif)
{
u8_t my_mac_addr[ETHARP_HWADDR_LEN] = LWIP_MAC_ADDR_BASE;
int adapter_num = PACKET_LIB_ADAPTER_NR;
struct pcapif_private *pa;
/* If 'state' is != NULL at this point, we assume it is an 'int' giving
the index of the adapter to use (+ 1 because 0==NULL is invalid).
This can be used to instantiate multiple PCAP drivers. */
if (netif->state != NULL) {
adapter_num = ((int)netif->state) - 1;
if (adapter_num < 0) {
printf("ERROR: invalid adapter index \"%d\"!\n", adapter_num);
LWIP_ASSERT("ERROR initializing network adapter!\n", 0);
return;
}
}
#ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
ip_addr_t netaddr;
#define GUID_LEN 128
char guid[GUID_LEN + 1];
memset(&guid, 0, sizeof(guid));
PACKET_LIB_GET_ADAPTER_NETADDRESS(&netaddr);
if (get_adapter_index_from_addr((struct in_addr *)&netaddr, guid, GUID_LEN) < 0) {
printf("ERROR initializing network adapter, failed to get GUID for network address %s\n", ip_ntoa(&netaddr));
LWIP_ASSERT("ERROR initializing network adapter, failed to get GUID for network address!", 0);
return;
}
adapter_num = get_adapter_index(guid);
if (adapter_num < 0) {
printf("ERROR finding network adapter with GUID \"%s\"!\n", guid);
LWIP_ASSERT("ERROR finding network adapter with expected GUID!", 0);
return;
}
#else /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
#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);
if (pa == NULL) {
printf("ERROR initializing network adapter %d!\n", adapter_num);
LWIP_ASSERT("ERROR initializing network adapter!", 0);
return;
}
netif->state = pa;
/* change the MAC address to a unique value
so that multiple ethernetifs are supported */
/* @todo: this does NOT support multiple processes using this adapter! */
my_mac_addr[ETHARP_HWADDR_LEN - 1] += netif->num;
/* Copy MAC addr */
memcpy(&netif->hwaddr, my_mac_addr, ETHARP_HWADDR_LEN);
/* get the initial link state of the selected interface */
#if PCAPIF_HANDLE_LINKSTATE
pa->last_link_event = pcapifh_linkstate_get(pa->link_state);
if (pa->last_link_event == PCAPIF_LINKEVENT_DOWN) {
netif_set_link_down(netif);
} else {
netif_set_link_up(netif);
}
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("pcapif_rxthread", pcapif_input_thread, netif, 0, 0);
#endif
LWIP_DEBUGF(NETIF_DEBUG, ("pcapif: 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]));
}
/** 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;
const u8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
const u8_t mcast[] = {0x01, 0x00, 0x5e};
/* 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) &&
memcmp(dest, mcast, 3) && memcmp(dest, bcast, 6)) ||
/* 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;
#if LWIP_IPV6
netif->output_ip6 = ethip6_output;
#endif /* LWIP_IPV6 */
#else /* LWIP_ARP */
netif->output = NULL; /* not used for PPPoE */
#if LWIP_IPV6
netif->output_ip6 = NULL; /* not used for PPPoE */
#endif /* LWIP_IPV6 */
#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 */
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