[457] | 1 | /**
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| 2 | * pcapif.c - This file is part of lwIP pcapif
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| 3 | *
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| 4 | ****************************************************************************
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| 5 | *
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| 6 | * This file is derived from an example in lwIP with the following license:
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| 7 | *
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| 8 | * Copyright (c) 2001, Swedish Institute of Computer Science.
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| 9 | * All rights reserved.
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| 10 | *
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| 11 | * Redistribution and use in source and binary forms, with or without
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| 12 | * modification, are permitted provided that the following conditions
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| 13 | * are met:
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| 14 | * 1. Redistributions of source code must retain the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer.
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| 16 | * 2. Redistributions in binary form must reproduce the above copyright
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| 17 | * notice, this list of conditions and the following disclaimer in the
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| 18 | * documentation and/or other materials provided with the distribution.
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| 19 | * 3. Neither the name of the Institute nor the names of its contributors
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| 20 | * may be used to endorse or promote products derived from this software
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| 21 | * without specific prior written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 33 | * SUCH DAMAGE.
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| 34 | *
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| 35 | */
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| 36 |
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| 37 | /* include the port-dependent configuration */
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| 38 | #include "lwipcfg.h"
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| 39 |
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| 40 | #include <stdlib.h>
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| 41 | #include <stdio.h>
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| 42 |
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| 43 | #ifdef _MSC_VER
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| 44 | #pragma warning( push, 3 )
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| 45 | #include "pcap.h"
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| 46 | #pragma warning ( pop )
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| 47 | #else
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| 48 | /* e.g. mingw */
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| 49 | #define _MSC_VER 1500
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| 50 | #include "pcap.h"
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| 51 | #undef _MSC_VER
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| 52 | #endif
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| 53 |
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| 54 | #include "lwip/opt.h"
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| 55 |
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| 56 | #if LWIP_ETHERNET
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| 57 |
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| 58 | #include "pcapif.h"
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| 59 |
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| 60 | #include <stdlib.h>
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| 61 | #include <stdio.h>
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| 62 | #include <string.h>
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| 63 |
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| 64 | #include "lwip/debug.h"
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| 65 |
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| 66 | #include "lwip/def.h"
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| 67 | #include "lwip/mem.h"
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| 68 | #include "lwip/pbuf.h"
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| 69 | #include "lwip/stats.h"
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| 70 | #include "lwip/sys.h"
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| 71 | #include "lwip/ip.h"
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| 72 | #include "lwip/snmp.h"
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| 73 | #include "lwip/tcpip.h"
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| 74 | #include "lwip/timeouts.h"
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| 75 | #include "lwip/ethip6.h"
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| 76 |
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| 77 | #include "lwip/etharp.h"
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| 78 |
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| 79 | /* For compatibility with old pcap */
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| 80 | #ifndef PCAP_OPENFLAG_PROMISCUOUS
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| 81 | #define PCAP_OPENFLAG_PROMISCUOUS 1
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| 82 | #endif
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| 83 |
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| 84 | /** Set this to 0 to receive all multicast ethernet destination addresses */
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| 85 | #ifndef PCAPIF_FILTER_GROUP_ADDRESSES
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| 86 | #define PCAPIF_FILTER_GROUP_ADDRESSES 1
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| 87 | #endif
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| 88 |
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| 89 | /** Set this to 1 to receive all frames (also unicast to other addresses)
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| 90 | * In this mode, filtering out our own tx packets from loopback receiving
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| 91 | * is done via matching rx against recent tx (memcmp).
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| 92 | */
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| 93 | #ifndef PCAPIF_RECEIVE_PROMISCUOUS
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| 94 | #define PCAPIF_RECEIVE_PROMISCUOUS 0
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| 95 | #endif
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| 96 |
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| 97 | /* Define those to better describe your network interface.
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| 98 | For now, we use 'e0', 'e1', 'e2' and so on */
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| 99 | #define IFNAME0 'e'
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| 100 | #define IFNAME1 '0'
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| 101 |
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| 102 | /** index of the network adapter to use for lwIP */
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| 103 | #ifndef PACKET_LIB_ADAPTER_NR
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| 104 | #define PACKET_LIB_ADAPTER_NR 0
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| 105 | #endif
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| 106 |
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| 107 | /** If 1, check link state and report it to lwIP.
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| 108 | * If 0, don't check link state (lwIP link state is always UP).
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| 109 | */
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| 110 | #ifndef PCAPIF_HANDLE_LINKSTATE
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| 111 | #define PCAPIF_HANDLE_LINKSTATE 1
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| 112 | #endif
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| 113 |
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| 114 | /** If 1, use PBUF_REF for RX (for testing purposes mainly).
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| 115 | * For this, LWIP_SUPPORT_CUSTOM_PBUF must be enabled.
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| 116 | */
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| 117 | #ifndef PCAPIF_RX_REF
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| 118 | #define PCAPIF_RX_REF 0
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| 119 | #endif
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| 120 |
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| 121 | /** This can be used when netif->state is used for something else in your
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| 122 | * application (e.g. when wrapping a class around this interface). Just
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| 123 | * make sure this define returns the state pointer set by
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| 124 | * pcapif_low_level_init() (e.g. by using an offset or a callback).
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| 125 | */
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| 126 | #ifndef PCAPIF_GET_STATE_PTR
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| 127 | #define PCAPIF_GET_STATE_PTR(netif) ((netif)->state)
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| 128 | #endif
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| 129 |
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| 130 | #if PCAPIF_HANDLE_LINKSTATE
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| 131 | #include "pcapif_helper.h"
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| 132 |
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| 133 | /* Define "PHY" delay when "link up" */
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| 134 | #ifndef PCAPIF_LINKUP_DELAY
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| 135 | #define PCAPIF_LINKUP_DELAY 0
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| 136 | #endif
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| 137 |
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| 138 | #define PCAPIF_LINKCHECK_INTERVAL_MS 500
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| 139 |
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| 140 | /* link state notification macro */
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| 141 | #if PCAPIF_LINKUP_DELAY
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| 142 | #define PCAPIF_NOTIFY_LINKSTATE(netif, linkfunc) sys_timeout(PCAPIF_LINKUP_DELAY, (sys_timeout_handler)linkfunc, netif)
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| 143 | #else /* PHY_LINKUP_DELAY */
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| 144 | #define PCAPIF_NOTIFY_LINKSTATE(netif, linkfunc) linkfunc(netif)
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| 145 | #endif /* PHY_LINKUP_DELAY */
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| 146 |
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| 147 | #endif /* PCAPIF_HANDLE_LINKSTATE */
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| 148 |
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| 149 | /* Define PCAPIF_RX_LOCK_LWIP and PCAPIF_RX_UNLOCK_LWIP if you need to lock the lwIP core
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| 150 | before/after pbuf_alloc() or netif->input() are called on RX. */
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| 151 | #ifndef PCAPIF_RX_LOCK_LWIP
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| 152 | #define PCAPIF_RX_LOCK_LWIP()
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| 153 | #endif
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| 154 | #ifndef PCAPIF_RX_UNLOCK_LWIP
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| 155 | #define PCAPIF_RX_UNLOCK_LWIP()
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| 156 | #endif
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| 157 |
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| 158 | #define ETH_MIN_FRAME_LEN 60U
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| 159 | #define ETH_MAX_FRAME_LEN 1518U
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| 160 |
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| 161 | #define ADAPTER_NAME_LEN 128
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| 162 | #define ADAPTER_DESC_LEN 128
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| 163 |
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| 164 | #if PCAPIF_RECEIVE_PROMISCUOUS
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| 165 | #ifndef PCAPIF_LOOPBACKFILTER_NUM_TX_PACKETS
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| 166 | #define PCAPIF_LOOPBACKFILTER_NUM_TX_PACKETS 128
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| 167 | #endif
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| 168 | struct pcapipf_pending_packet {
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| 169 | struct pcapipf_pending_packet *next;
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| 170 | u16_t len;
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| 171 | u8_t data[ETH_MAX_FRAME_LEN];
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| 172 | };
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| 173 | #endif /* PCAPIF_RECEIVE_PROMISCUOUS */
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| 174 |
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| 175 | /* Packet Adapter informations */
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| 176 | struct pcapif_private {
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| 177 | void *input_fn_arg;
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| 178 | pcap_t *adapter;
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| 179 | char name[ADAPTER_NAME_LEN];
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| 180 | char description[ADAPTER_DESC_LEN];
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| 181 | int shutdown_called;
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| 182 | #if PCAPIF_RX_USE_THREAD
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| 183 | volatile int rx_run;
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| 184 | volatile int rx_running;
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| 185 | #endif /* PCAPIF_RX_USE_THREAD */
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| 186 | #if PCAPIF_HANDLE_LINKSTATE
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| 187 | struct pcapifh_linkstate *link_state;
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| 188 | enum pcapifh_link_event last_link_event;
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| 189 | #endif /* PCAPIF_HANDLE_LINKSTATE */
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| 190 | #if PCAPIF_RECEIVE_PROMISCUOUS
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| 191 | struct pcapipf_pending_packet packets[PCAPIF_LOOPBACKFILTER_NUM_TX_PACKETS];
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| 192 | struct pcapipf_pending_packet *tx_packets;
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| 193 | struct pcapipf_pending_packet *free_packets;
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| 194 | #endif /* PCAPIF_RECEIVE_PROMISCUOUS */
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| 195 | };
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| 196 |
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| 197 | #if PCAPIF_RECEIVE_PROMISCUOUS
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| 198 | static void
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| 199 | pcapif_init_tx_packets(struct pcapif_private *priv)
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| 200 | {
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| 201 | int i;
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| 202 | priv->tx_packets = NULL;
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| 203 | priv->free_packets = NULL;
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| 204 | for (i = 0; i < PCAPIF_LOOPBACKFILTER_NUM_TX_PACKETS; i++) {
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| 205 | struct pcapipf_pending_packet *pack = &priv->packets[i];
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| 206 | pack->len = 0;
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| 207 | pack->next = priv->free_packets;
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| 208 | priv->free_packets = pack;
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| 209 | }
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| 210 | }
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| 211 |
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| 212 | static void
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| 213 | pcapif_add_tx_packet(struct pcapif_private *priv, unsigned char *buf, u16_t tot_len)
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| 214 | {
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| 215 | struct pcapipf_pending_packet *tx;
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| 216 | struct pcapipf_pending_packet *pack;
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| 217 | SYS_ARCH_DECL_PROTECT(lev);
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| 218 |
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| 219 | /* get a free packet (locked) */
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| 220 | SYS_ARCH_PROTECT(lev);
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| 221 | pack = priv->free_packets;
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| 222 | if ((pack == NULL) && (priv->tx_packets != NULL)) {
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| 223 | /* no free packets, reuse the oldest */
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| 224 | pack = priv->tx_packets;
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| 225 | priv->tx_packets = pack->next;
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| 226 | }
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| 227 | LWIP_ASSERT("no free packet", pack != NULL);
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| 228 | priv->free_packets = pack->next;
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| 229 | pack->next = NULL;
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| 230 | SYS_ARCH_UNPROTECT(lev);
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| 231 |
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| 232 | /* set up the packet (unlocked) */
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| 233 | pack->len = tot_len;
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| 234 | memcpy(pack->data, buf, tot_len);
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| 235 |
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| 236 | /* put the packet on the list (locked) */
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| 237 | SYS_ARCH_PROTECT(lev);
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| 238 | if (priv->tx_packets != NULL) {
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| 239 | for (tx = priv->tx_packets; tx->next != NULL; tx = tx->next);
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| 240 | LWIP_ASSERT("bug", tx != NULL);
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| 241 | tx->next = pack;
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| 242 | } else {
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| 243 | priv->tx_packets = pack;
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| 244 | }
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| 245 | SYS_ARCH_UNPROTECT(lev);
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| 246 | }
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| 247 |
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| 248 | static int
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| 249 | pcapif_compare_packets(struct pcapipf_pending_packet *pack, const void *packet, int packet_len)
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| 250 | {
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| 251 | if (pack->len == packet_len) {
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| 252 | if (!memcmp(pack->data, packet, packet_len)) {
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| 253 | return 1;
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| 254 | }
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| 255 | }
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| 256 | return 0;
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| 257 | }
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| 258 |
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| 259 | static int
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| 260 | pcaipf_is_tx_packet(struct netif *netif, const void *packet, int packet_len)
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| 261 | {
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| 262 | struct pcapif_private *priv = (struct pcapif_private*)PCAPIF_GET_STATE_PTR(netif);
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| 263 | struct pcapipf_pending_packet *iter, *last;
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| 264 | SYS_ARCH_DECL_PROTECT(lev);
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| 265 |
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| 266 | last = priv->tx_packets;
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| 267 | if (last == NULL) {
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| 268 | /* list is empty */
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| 269 | return 0;
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| 270 | }
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| 271 | /* compare the first packet */
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| 272 | if (pcapif_compare_packets(last, packet, packet_len)) {
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| 273 | SYS_ARCH_PROTECT(lev);
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| 274 | LWIP_ASSERT("list has changed", last == priv->tx_packets);
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| 275 | priv->tx_packets = last->next;
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| 276 | last->next = priv->free_packets;
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| 277 | priv->free_packets = last;
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| 278 | last->len = 0;
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| 279 | SYS_ARCH_UNPROTECT(lev);
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| 280 | return 1;
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| 281 | }
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| 282 | SYS_ARCH_PROTECT(lev);
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| 283 | for (iter = last->next; iter != NULL; last = iter, iter = iter->next) {
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| 284 | /* unlock while comparing (this works because we have a clean threading separation
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| 285 | of adding and removing items and adding is only done at the end) */
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| 286 | SYS_ARCH_UNPROTECT(lev);
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| 287 | if (pcapif_compare_packets(iter, packet, packet_len)) {
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| 288 | SYS_ARCH_PROTECT(lev);
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| 289 | LWIP_ASSERT("last != NULL", last != NULL);
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| 290 | last->next = iter->next;
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| 291 | iter->next = priv->free_packets;
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| 292 | priv->free_packets = iter;
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| 293 | last->len = 0;
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| 294 | SYS_ARCH_UNPROTECT(lev);
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| 295 | return 1;
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| 296 | }
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| 297 | SYS_ARCH_PROTECT(lev);
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| 298 | }
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| 299 | SYS_ARCH_UNPROTECT(lev);
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| 300 | return 0;
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| 301 | }
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| 302 | #else /* PCAPIF_RECEIVE_PROMISCUOUS */
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| 303 | #define pcapif_init_tx_packets(priv)
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| 304 | #define pcapif_add_tx_packet(priv, buf, tot_len)
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| 305 | static int
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| 306 | pcaipf_is_tx_packet(struct netif *netif, const void *packet, int packet_len)
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| 307 | {
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| 308 | const struct eth_addr *src = (const struct eth_addr *)packet + 1;
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| 309 | if (packet_len >= (ETH_HWADDR_LEN * 2)) {
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| 310 | /* Don't let feedback packets through (limitation in winpcap?) */
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| 311 | if(!memcmp(src, netif->hwaddr, ETH_HWADDR_LEN)) {
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| 312 | return 1;
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| 313 | }
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| 314 | }
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| 315 | return 0;
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| 316 | }
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| 317 | #endif /* PCAPIF_RECEIVE_PROMISCUOUS */
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| 318 |
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| 319 | #if PCAPIF_RX_REF
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| 320 | struct pcapif_pbuf_custom
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| 321 | {
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| 322 | struct pbuf_custom pc;
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| 323 | struct pbuf* p;
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| 324 | };
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| 325 | #endif /* PCAPIF_RX_REF */
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| 326 |
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| 327 | /* Forward declarations. */
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| 328 | static void pcapif_input(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *packet);
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| 329 |
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| 330 | #ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
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| 331 | /** Get the index of an adapter by its network address
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| 332 | *
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| 333 | * @param netaddr network address of the adapter (e.g. 192.168.1.0)
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| 334 | * @return index of the adapter or negative on error
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| 335 | */
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| 336 | static int
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| 337 | get_adapter_index_from_addr(struct in_addr *netaddr, char *guid, size_t guid_len)
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| 338 | {
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| 339 | pcap_if_t *alldevs;
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| 340 | pcap_if_t *d;
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| 341 | char errbuf[PCAP_ERRBUF_SIZE+1];
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| 342 | int index = 0;
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| 343 |
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| 344 | memset(guid, 0, guid_len);
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| 345 |
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| 346 | /* Retrieve the interfaces list */
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| 347 | if (pcap_findalldevs(&alldevs, errbuf) == -1) {
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| 348 | printf("Error in pcap_findalldevs: %s\n", errbuf);
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| 349 | return -1;
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| 350 | }
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| 351 | /* Scan the list printing every entry */
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| 352 | for (d = alldevs; d != NULL; d = d->next, index++) {
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| 353 | pcap_addr_t *a;
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| 354 | for(a = d->addresses; a != NULL; a = a->next) {
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| 355 | if (a->addr->sa_family == AF_INET) {
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| 356 | ULONG a_addr = ((struct sockaddr_in *)a->addr)->sin_addr.s_addr;
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| 357 | ULONG a_netmask = ((struct sockaddr_in *)a->netmask)->sin_addr.s_addr;
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| 358 | ULONG a_netaddr = a_addr & a_netmask;
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| 359 | ULONG addr = (*netaddr).s_addr;
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| 360 | if (a_netaddr == addr) {
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| 361 | int ret = -1;
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| 362 | char name[128];
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| 363 | char *start, *end;
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| 364 | size_t len = strlen(d->name);
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| 365 | if(len > 127) {
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| 366 | len = 127;
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| 367 | }
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| 368 | MEMCPY(name, d->name, len);
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| 369 | name[len] = 0;
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| 370 | start = strstr(name, "{");
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| 371 | if (start != NULL) {
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| 372 | end = strstr(start, "}");
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| 373 | if (end != NULL) {
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| 374 | size_t len = end - start + 1;
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| 375 | MEMCPY(guid, start, len);
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| 376 | ret = index;
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| 377 | }
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| 378 | }
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| 379 | pcap_freealldevs(alldevs);
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| 380 | return ret;
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| 381 | }
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| 382 | }
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| 383 | }
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| 384 | }
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| 385 | printf("Network address not found.\n");
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| 386 |
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| 387 | pcap_freealldevs(alldevs);
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| 388 | return -1;
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| 389 | }
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| 390 | #endif /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
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| 391 |
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| 392 | #if defined(PACKET_LIB_GET_ADAPTER_NETADDRESS) || defined(PACKET_LIB_ADAPTER_GUID)
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| 393 | /** Get the index of an adapter by its GUID
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| 394 | *
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| 395 | * @param adapter_guid GUID of the adapter
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| 396 | * @return index of the adapter or negative on error
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| 397 | */
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| 398 | static int
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| 399 | get_adapter_index(const char* adapter_guid)
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| 400 | {
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| 401 | pcap_if_t *alldevs;
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| 402 | pcap_if_t *d;
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| 403 | char errbuf[PCAP_ERRBUF_SIZE+1];
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| 404 | int idx = 0;
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| 405 |
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| 406 | /* Retrieve the interfaces list */
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| 407 | if (pcap_findalldevs(&alldevs, errbuf) == -1) {
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| 408 | printf("Error in pcap_findalldevs: %s\n", errbuf);
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| 409 | return -1;
|
---|
| 410 | }
|
---|
| 411 | /* Scan the list and compare name vs. adapter_guid */
|
---|
| 412 | for (d = alldevs; d != NULL; d = d->next, idx++) {
|
---|
| 413 | if(strstr(d->name, adapter_guid)) {
|
---|
| 414 | pcap_freealldevs(alldevs);
|
---|
| 415 | return idx;
|
---|
| 416 | }
|
---|
| 417 | }
|
---|
| 418 | /* not found, dump all adapters */
|
---|
| 419 | printf("%d available adapters:\n", idx);
|
---|
| 420 | for (d = alldevs, idx = 0; d != NULL; d = d->next, idx++) {
|
---|
| 421 | printf("- %d: %s\n", idx, d->name);
|
---|
| 422 | }
|
---|
| 423 | pcap_freealldevs(alldevs);
|
---|
| 424 | return -1;
|
---|
| 425 | }
|
---|
| 426 | #endif /* defined(PACKET_LIB_GET_ADAPTER_NETADDRESS) || defined(PACKET_LIB_ADAPTER_GUID) */
|
---|
| 427 |
|
---|
| 428 | static pcap_t*
|
---|
| 429 | pcapif_open_adapter(const char* adapter_name, char* errbuf)
|
---|
| 430 | {
|
---|
| 431 | pcap_t* adapter = pcap_open_live(adapter_name,/* name of the device */
|
---|
| 432 | 65536, /* portion of the packet to capture */
|
---|
| 433 | /* 65536 guarantees that the whole packet will be captured on all the link layers */
|
---|
| 434 | PCAP_OPENFLAG_PROMISCUOUS,/* promiscuous mode */
|
---|
| 435 | #if PCAPIF_RX_USE_THREAD
|
---|
| 436 | /*-*/1, /* don't wait at all for lower latency */
|
---|
| 437 | #else
|
---|
| 438 | 1, /* wait 1 ms in ethernetif_poll */
|
---|
| 439 | #endif
|
---|
| 440 | errbuf); /* error buffer */
|
---|
| 441 | return adapter;
|
---|
| 442 | }
|
---|
| 443 |
|
---|
| 444 | #if !PCAPIF_RX_USE_THREAD
|
---|
| 445 | static void
|
---|
| 446 | pcap_reopen_adapter(struct pcapif_private *pa)
|
---|
| 447 | {
|
---|
| 448 | char errbuf[PCAP_ERRBUF_SIZE+1];
|
---|
| 449 | pcap_if_t *alldevs;
|
---|
| 450 | if (pa->adapter != NULL) {
|
---|
| 451 | pcap_close(pa->adapter);
|
---|
| 452 | pa->adapter = NULL;
|
---|
| 453 | }
|
---|
| 454 | if (pcap_findalldevs(&alldevs, errbuf) != -1) {
|
---|
| 455 | pcap_if_t *d;
|
---|
| 456 | for (d = alldevs; d != NULL; d = d->next) {
|
---|
| 457 | if (!strcmp(d->name, pa->name)) {
|
---|
| 458 | pa->adapter = pcapif_open_adapter(pa->name, errbuf);
|
---|
| 459 | if (pa->adapter == NULL) {
|
---|
| 460 | printf("failed to reopen pcap adapter after failure: %s\n", errbuf);
|
---|
| 461 | }
|
---|
| 462 | break;
|
---|
| 463 | }
|
---|
| 464 | }
|
---|
| 465 | pcap_freealldevs(alldevs);
|
---|
| 466 | }
|
---|
| 467 | }
|
---|
| 468 | #endif
|
---|
| 469 |
|
---|
| 470 | /**
|
---|
| 471 | * Open a network adapter and set it up for packet input
|
---|
| 472 | *
|
---|
| 473 | * @param adapter_num the index of the adapter to use
|
---|
| 474 | * @param arg argument to pass to input
|
---|
| 475 | * @return an adapter handle on success, NULL on failure
|
---|
| 476 | */
|
---|
| 477 | static struct pcapif_private*
|
---|
| 478 | pcapif_init_adapter(int adapter_num, void *arg)
|
---|
| 479 | {
|
---|
| 480 | int i;
|
---|
| 481 | int number_of_adapters;
|
---|
| 482 | struct pcapif_private *pa;
|
---|
| 483 | char errbuf[PCAP_ERRBUF_SIZE+1];
|
---|
| 484 |
|
---|
| 485 | pcap_if_t *alldevs;
|
---|
| 486 | pcap_if_t *d;
|
---|
| 487 | pcap_if_t *used_adapter = NULL;
|
---|
| 488 |
|
---|
| 489 | pa = (struct pcapif_private *)malloc(sizeof(struct pcapif_private));
|
---|
| 490 | if (!pa) {
|
---|
| 491 | printf("Unable to alloc the adapter!\n");
|
---|
| 492 | return NULL;
|
---|
| 493 | }
|
---|
| 494 |
|
---|
| 495 | memset(pa, 0, sizeof(struct pcapif_private));
|
---|
| 496 | pcapif_init_tx_packets(pa);
|
---|
| 497 | pa->input_fn_arg = arg;
|
---|
| 498 |
|
---|
| 499 | /* Retrieve the interfaces list */
|
---|
| 500 | if (pcap_findalldevs(&alldevs, errbuf) == -1) {
|
---|
| 501 | free(pa);
|
---|
| 502 | return NULL; /* no adapters found */
|
---|
| 503 | }
|
---|
| 504 | /* get number of adapters and adapter pointer */
|
---|
| 505 | for (d = alldevs, number_of_adapters = 0; d != NULL; d = d->next, number_of_adapters++) {
|
---|
| 506 | if (number_of_adapters == adapter_num) {
|
---|
| 507 | char *desc = d->description;
|
---|
| 508 | size_t len;
|
---|
| 509 |
|
---|
| 510 | len = strlen(d->name);
|
---|
| 511 | LWIP_ASSERT("len < ADAPTER_NAME_LEN", len < ADAPTER_NAME_LEN);
|
---|
| 512 | strcpy(pa->name, d->name);
|
---|
| 513 |
|
---|
| 514 | used_adapter = d;
|
---|
| 515 | /* format vendor description */
|
---|
| 516 | if (desc != NULL) {
|
---|
| 517 | len = strlen(desc);
|
---|
| 518 | if (strstr(desc, " ' on local host") != NULL) {
|
---|
| 519 | len -= 16;
|
---|
| 520 | }
|
---|
| 521 | else if (strstr(desc, "' on local host") != NULL) {
|
---|
| 522 | len -= 15;
|
---|
| 523 | }
|
---|
| 524 | if (strstr(desc, "Network adapter '") == desc) {
|
---|
| 525 | len -= 17;
|
---|
| 526 | desc += 17;
|
---|
| 527 | }
|
---|
| 528 | len = LWIP_MIN(len, ADAPTER_DESC_LEN-1);
|
---|
| 529 | while ((desc[len-1] == ' ') || (desc[len-1] == '\t')) {
|
---|
| 530 | /* don't copy trailing whitespace */
|
---|
| 531 | len--;
|
---|
| 532 | }
|
---|
| 533 | strncpy(pa->description, desc, len);
|
---|
| 534 | pa->description[len] = 0;
|
---|
| 535 | } else {
|
---|
| 536 | strcpy(pa->description, "<no_desc>");
|
---|
| 537 | }
|
---|
| 538 | }
|
---|
| 539 | }
|
---|
| 540 |
|
---|
| 541 | #ifndef PCAPIF_LIB_QUIET
|
---|
| 542 | /* Scan the list printing every entry */
|
---|
| 543 | for (d = alldevs, i = 0; d != NULL; d = d->next, i++) {
|
---|
| 544 | char *desc = d->description;
|
---|
| 545 | char descBuf[128];
|
---|
| 546 | size_t len;
|
---|
| 547 | const char* devname = d->name;
|
---|
| 548 | if (d->name == NULL) {
|
---|
| 549 | devname = "<unnamed>";
|
---|
| 550 | } else {
|
---|
| 551 | if (strstr(devname, "\\Device\\") == devname) {
|
---|
| 552 | /* windows: strip the first part */
|
---|
| 553 | devname += 8;
|
---|
| 554 | }
|
---|
| 555 | }
|
---|
| 556 | printf("%2i: %s\n", i, devname);
|
---|
| 557 | if (desc != NULL) {
|
---|
| 558 | /* format vendor description */
|
---|
| 559 | len = strlen(desc);
|
---|
| 560 | if (strstr(desc, " ' on local host") != NULL) {
|
---|
| 561 | len -= 16;
|
---|
| 562 | }
|
---|
| 563 | else if (strstr(desc, "' on local host") != NULL) {
|
---|
| 564 | len -= 15;
|
---|
| 565 | }
|
---|
| 566 | if (strstr(desc, "Network adapter '") == desc) {
|
---|
| 567 | len -= 17;
|
---|
| 568 | desc += 17;
|
---|
| 569 | }
|
---|
| 570 | len = LWIP_MIN(len, 127);
|
---|
| 571 | while ((desc[len-1] == ' ') || (desc[len-1] == '\t')) {
|
---|
| 572 | /* don't copy trailing whitespace */
|
---|
| 573 | len--;
|
---|
| 574 | }
|
---|
| 575 | strncpy(descBuf, desc, len);
|
---|
| 576 | descBuf[len] = 0;
|
---|
| 577 | printf(" Desc: \"%s\"\n", descBuf);
|
---|
| 578 | }
|
---|
| 579 | }
|
---|
| 580 | #endif /* PCAPIF_LIB_QUIET */
|
---|
| 581 |
|
---|
| 582 | /* invalid adapter index -> check this after printing the adapters */
|
---|
| 583 | if (adapter_num < 0) {
|
---|
| 584 | printf("Invalid adapter_num: %d\n", adapter_num);
|
---|
| 585 | free(pa);
|
---|
| 586 | pcap_freealldevs(alldevs);
|
---|
| 587 | return NULL;
|
---|
| 588 | }
|
---|
| 589 | /* adapter index out of range */
|
---|
| 590 | if (adapter_num >= number_of_adapters) {
|
---|
| 591 | printf("Invalid adapter_num: %d\n", adapter_num);
|
---|
| 592 | free(pa);
|
---|
| 593 | pcap_freealldevs(alldevs);
|
---|
| 594 | return NULL;
|
---|
| 595 | }
|
---|
| 596 | #ifndef PCAPIF_LIB_QUIET
|
---|
| 597 | printf("Using adapter_num: %d\n", adapter_num);
|
---|
| 598 | #endif /* PCAPIF_LIB_QUIET */
|
---|
| 599 | /* set up the selected adapter */
|
---|
| 600 |
|
---|
| 601 | LWIP_ASSERT("used_adapter != NULL", used_adapter != NULL);
|
---|
| 602 |
|
---|
| 603 | /* Open the device */
|
---|
| 604 | pa->adapter = pcapif_open_adapter(used_adapter->name, errbuf);
|
---|
| 605 | if (pa->adapter == NULL) {
|
---|
| 606 | printf("\nUnable to open the adapter. %s is not supported by pcap (\"%s\").\n", used_adapter->name, errbuf);
|
---|
| 607 | /* Free the device list */
|
---|
| 608 | pcap_freealldevs(alldevs);
|
---|
| 609 | free(pa);
|
---|
| 610 | return NULL;
|
---|
| 611 | }
|
---|
| 612 | printf("Using adapter: \"%s\"\n", pa->description);
|
---|
| 613 | pcap_freealldevs(alldevs);
|
---|
| 614 |
|
---|
| 615 | #if PCAPIF_HANDLE_LINKSTATE
|
---|
| 616 | pa->link_state = pcapifh_linkstate_init(pa->name);
|
---|
| 617 | pa->last_link_event = PCAPIF_LINKEVENT_UNKNOWN;
|
---|
| 618 | #endif /* PCAPIF_HANDLE_LINKSTATE */
|
---|
| 619 |
|
---|
| 620 | return pa;
|
---|
| 621 | }
|
---|
| 622 |
|
---|
| 623 | #if PCAPIF_HANDLE_LINKSTATE
|
---|
| 624 | static void
|
---|
| 625 | pcapif_check_linkstate(void *netif_ptr)
|
---|
| 626 | {
|
---|
| 627 | struct netif *netif = (struct netif*)netif_ptr;
|
---|
| 628 | struct pcapif_private *pa = (struct pcapif_private*)PCAPIF_GET_STATE_PTR(netif);
|
---|
| 629 | enum pcapifh_link_event le;
|
---|
| 630 |
|
---|
| 631 | le = pcapifh_linkstate_get(pa->link_state);
|
---|
| 632 |
|
---|
| 633 | if (pa->last_link_event != le) {
|
---|
| 634 | pa->last_link_event = le;
|
---|
| 635 | switch (le) {
|
---|
| 636 | case PCAPIF_LINKEVENT_UP: {
|
---|
| 637 | PCAPIF_NOTIFY_LINKSTATE(netif, netif_set_link_up);
|
---|
| 638 | break;
|
---|
| 639 | }
|
---|
| 640 | case PCAPIF_LINKEVENT_DOWN: {
|
---|
| 641 | PCAPIF_NOTIFY_LINKSTATE(netif, netif_set_link_down);
|
---|
| 642 | break;
|
---|
| 643 | }
|
---|
| 644 | case PCAPIF_LINKEVENT_UNKNOWN: /* fall through */
|
---|
| 645 | default:
|
---|
| 646 | break;
|
---|
| 647 | }
|
---|
| 648 | }
|
---|
| 649 | sys_timeout(PCAPIF_LINKCHECK_INTERVAL_MS, pcapif_check_linkstate, netif);
|
---|
| 650 | }
|
---|
| 651 | #endif /* PCAPIF_HANDLE_LINKSTATE */
|
---|
| 652 |
|
---|
| 653 |
|
---|
| 654 | /**
|
---|
| 655 | * Close the adapter (no more packets can be sent or received)
|
---|
| 656 | *
|
---|
| 657 | * @param netif netif to shutdown
|
---|
| 658 | */
|
---|
| 659 | void
|
---|
| 660 | pcapif_shutdown(struct netif *netif)
|
---|
| 661 | {
|
---|
| 662 | struct pcapif_private *pa = (struct pcapif_private*)PCAPIF_GET_STATE_PTR(netif);
|
---|
| 663 | if (pa) {
|
---|
| 664 | #if PCAPIF_RX_USE_THREAD
|
---|
| 665 | pa->rx_run = 0;
|
---|
| 666 | #endif /* PCAPIF_RX_USE_THREAD */
|
---|
| 667 | if (pa->adapter) {
|
---|
| 668 | pcap_breakloop(pa->adapter);
|
---|
| 669 | pcap_close(pa->adapter);
|
---|
| 670 | }
|
---|
| 671 | #if PCAPIF_RX_USE_THREAD
|
---|
| 672 | /* wait for rxthread to end */
|
---|
| 673 | while(pa->rx_running);
|
---|
| 674 | #endif /* PCAPIF_RX_USE_THREAD */
|
---|
| 675 | #if PCAPIF_HANDLE_LINKSTATE
|
---|
| 676 | pcapifh_linkstate_close(pa->link_state);
|
---|
| 677 | #endif /* PCAPIF_HANDLE_LINKSTATE */
|
---|
| 678 | free(pa);
|
---|
| 679 | }
|
---|
| 680 | }
|
---|
| 681 |
|
---|
| 682 | #if PCAPIF_RX_USE_THREAD
|
---|
| 683 | /** RX running in its own thread */
|
---|
| 684 | static void
|
---|
| 685 | pcapif_input_thread(void *arg)
|
---|
| 686 | {
|
---|
| 687 | struct netif *netif = (struct netif *)arg;
|
---|
| 688 | struct pcapif_private *pa = (struct pcapif_private*)PCAPIF_GET_STATE_PTR(netif);
|
---|
| 689 | do
|
---|
| 690 | {
|
---|
| 691 | struct pcap_pkthdr pkt_header;
|
---|
| 692 | const u_char *packet = pcap_next(pa->adapter, &pkt_header);
|
---|
| 693 | if(packet != NULL) {
|
---|
| 694 | pcapif_input((u_char*)pa, &pkt_header, packet);
|
---|
| 695 | }
|
---|
| 696 | } while (pa->rx_run);
|
---|
| 697 | pa->rx_running = 0;
|
---|
| 698 | }
|
---|
| 699 | #endif /* PCAPIF_RX_USE_THREAD */
|
---|
| 700 |
|
---|
| 701 | /** Low-level initialization: find the correct adapter and initialize it.
|
---|
| 702 | */
|
---|
| 703 | static void
|
---|
| 704 | pcapif_low_level_init(struct netif *netif)
|
---|
| 705 | {
|
---|
| 706 | u8_t my_mac_addr[ETH_HWADDR_LEN] = LWIP_MAC_ADDR_BASE;
|
---|
| 707 | int adapter_num = PACKET_LIB_ADAPTER_NR;
|
---|
| 708 | struct pcapif_private *pa;
|
---|
| 709 | #ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
|
---|
| 710 | ip4_addr_t netaddr;
|
---|
| 711 | #define GUID_LEN 128
|
---|
| 712 | char guid[GUID_LEN + 1];
|
---|
| 713 | #endif /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
|
---|
| 714 |
|
---|
| 715 | /* If 'state' is != NULL at this point, we assume it is an 'int' giving
|
---|
| 716 | the index of the adapter to use (+ 1 because 0==NULL is invalid).
|
---|
| 717 | This can be used to instantiate multiple PCAP drivers. */
|
---|
| 718 | if (netif->state != NULL) {
|
---|
| 719 | adapter_num = (LWIP_PTR_NUMERIC_CAST(int, netif->state)) - 1;
|
---|
| 720 | if (adapter_num < 0) {
|
---|
| 721 | printf("ERROR: invalid adapter index \"%d\"!\n", adapter_num);
|
---|
| 722 | LWIP_ASSERT("ERROR initializing network adapter!\n", 0);
|
---|
| 723 | return;
|
---|
| 724 | }
|
---|
| 725 | }
|
---|
| 726 |
|
---|
| 727 | #ifdef PACKET_LIB_GET_ADAPTER_NETADDRESS
|
---|
| 728 | memset(&guid, 0, sizeof(guid));
|
---|
| 729 | PACKET_LIB_GET_ADAPTER_NETADDRESS(&netaddr);
|
---|
| 730 | if (get_adapter_index_from_addr((struct in_addr *)&netaddr, guid, GUID_LEN) < 0) {
|
---|
| 731 | printf("ERROR initializing network adapter, failed to get GUID for network address %s\n", ip4addr_ntoa(&netaddr));
|
---|
| 732 | LWIP_ASSERT("ERROR initializing network adapter, failed to get GUID for network address!", 0);
|
---|
| 733 | return;
|
---|
| 734 | }
|
---|
| 735 | adapter_num = get_adapter_index(guid);
|
---|
| 736 | if (adapter_num < 0) {
|
---|
| 737 | printf("ERROR finding network adapter with GUID \"%s\"!\n", guid);
|
---|
| 738 | LWIP_ASSERT("ERROR finding network adapter with expected GUID!", 0);
|
---|
| 739 | return;
|
---|
| 740 | }
|
---|
| 741 |
|
---|
| 742 | #else /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
|
---|
| 743 | #ifdef PACKET_LIB_ADAPTER_GUID
|
---|
| 744 | /* get adapter index for guid string */
|
---|
| 745 | adapter_num = get_adapter_index(PACKET_LIB_ADAPTER_GUID);
|
---|
| 746 | if (adapter_num < 0) {
|
---|
| 747 | printf("ERROR finding network adapter with GUID \"%s\"!\n", PACKET_LIB_ADAPTER_GUID);
|
---|
| 748 | LWIP_ASSERT("ERROR initializing network adapter!\n", 0);
|
---|
| 749 | return;
|
---|
| 750 | }
|
---|
| 751 | #endif /* PACKET_LIB_ADAPTER_GUID */
|
---|
| 752 | #endif /* PACKET_LIB_GET_ADAPTER_NETADDRESS */
|
---|
| 753 |
|
---|
| 754 | /* Do whatever else is needed to initialize interface. */
|
---|
| 755 | pa = pcapif_init_adapter(adapter_num, netif);
|
---|
| 756 | if (pa == NULL) {
|
---|
| 757 | printf("ERROR initializing network adapter %d!\n", adapter_num);
|
---|
| 758 | LWIP_ASSERT("ERROR initializing network adapter!", 0);
|
---|
| 759 | return;
|
---|
| 760 | }
|
---|
| 761 | netif->state = pa;
|
---|
| 762 |
|
---|
| 763 | /* change the MAC address to a unique value
|
---|
| 764 | so that multiple ethernetifs are supported */
|
---|
| 765 | /* @todo: this does NOT support multiple processes using this adapter! */
|
---|
| 766 | my_mac_addr[ETH_HWADDR_LEN - 1] += netif->num;
|
---|
| 767 | /* Copy MAC addr */
|
---|
| 768 | SMEMCPY(&netif->hwaddr, my_mac_addr, ETH_HWADDR_LEN);
|
---|
| 769 |
|
---|
| 770 | /* get the initial link state of the selected interface */
|
---|
| 771 | #if PCAPIF_HANDLE_LINKSTATE
|
---|
| 772 | pa->last_link_event = pcapifh_linkstate_get(pa->link_state);
|
---|
| 773 | if (pa->last_link_event == PCAPIF_LINKEVENT_DOWN) {
|
---|
| 774 | netif_set_link_down(netif);
|
---|
| 775 | } else {
|
---|
| 776 | netif_set_link_up(netif);
|
---|
| 777 | }
|
---|
| 778 | sys_timeout(PCAPIF_LINKCHECK_INTERVAL_MS, pcapif_check_linkstate, netif);
|
---|
| 779 | #else /* PCAPIF_HANDLE_LINKSTATE */
|
---|
| 780 | /* just set the link up so that lwIP can transmit */
|
---|
| 781 | netif_set_link_up(netif);
|
---|
| 782 | #endif /* PCAPIF_HANDLE_LINKSTATE */
|
---|
| 783 |
|
---|
| 784 | #if PCAPIF_RX_USE_THREAD
|
---|
| 785 | pa->rx_run = 1;
|
---|
| 786 | pa->rx_running = 1;
|
---|
| 787 | sys_thread_new("pcapif_rxthread", pcapif_input_thread, netif, 0, 0);
|
---|
| 788 | #endif
|
---|
| 789 |
|
---|
| 790 | 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]));
|
---|
| 791 | }
|
---|
| 792 |
|
---|
| 793 | /** low_level_output():
|
---|
| 794 | * Transmit a packet. The packet is contained in the pbuf that is passed to
|
---|
| 795 | * the function. This pbuf might be chained.
|
---|
| 796 | */
|
---|
| 797 | static err_t
|
---|
| 798 | pcapif_low_level_output(struct netif *netif, struct pbuf *p)
|
---|
| 799 | {
|
---|
| 800 | struct pbuf *q;
|
---|
| 801 | unsigned char buffer[ETH_MAX_FRAME_LEN + ETH_PAD_SIZE];
|
---|
| 802 | unsigned char *buf = buffer;
|
---|
| 803 | unsigned char *ptr;
|
---|
| 804 | struct eth_hdr *ethhdr;
|
---|
| 805 | u16_t tot_len = p->tot_len - ETH_PAD_SIZE;
|
---|
| 806 | struct pcapif_private *pa = (struct pcapif_private*)PCAPIF_GET_STATE_PTR(netif);
|
---|
| 807 |
|
---|
| 808 | #if defined(LWIP_DEBUG) && LWIP_NETIF_TX_SINGLE_PBUF && !(LWIP_IPV4 && IP_FRAG) && (LWIP_IPV6 && LWIP_IPV6_FRAG)
|
---|
| 809 | LWIP_ASSERT("p->next == NULL && p->len == p->tot_len", p->next == NULL && p->len == p->tot_len);
|
---|
| 810 | #endif
|
---|
| 811 |
|
---|
| 812 | /* initiate transfer */
|
---|
| 813 | if ((p->len == p->tot_len) && (p->len >= ETH_MIN_FRAME_LEN + ETH_PAD_SIZE)) {
|
---|
| 814 | /* no pbuf chain, don't have to copy -> faster */
|
---|
| 815 | buf = &((unsigned char*)p->payload)[ETH_PAD_SIZE];
|
---|
| 816 | } else {
|
---|
| 817 | /* pbuf chain, copy into contiguous buffer */
|
---|
| 818 | if (p->tot_len >= sizeof(buffer)) {
|
---|
| 819 | LINK_STATS_INC(link.lenerr);
|
---|
| 820 | LINK_STATS_INC(link.drop);
|
---|
| 821 | MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
|
---|
| 822 | return ERR_BUF;
|
---|
| 823 | }
|
---|
| 824 | ptr = buffer;
|
---|
| 825 | for(q = p; q != NULL; q = q->next) {
|
---|
| 826 | /* Send the data from the pbuf to the interface, one pbuf at a
|
---|
| 827 | time. The size of the data in each pbuf is kept in the ->len
|
---|
| 828 | variable. */
|
---|
| 829 | /* send data from(q->payload, q->len); */
|
---|
| 830 | 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));
|
---|
| 831 | if (q == p) {
|
---|
| 832 | MEMCPY(ptr, &((char*)q->payload)[ETH_PAD_SIZE], q->len - ETH_PAD_SIZE);
|
---|
| 833 | ptr += q->len - ETH_PAD_SIZE;
|
---|
| 834 | } else {
|
---|
| 835 | MEMCPY(ptr, q->payload, q->len);
|
---|
| 836 | ptr += q->len;
|
---|
| 837 | }
|
---|
| 838 | }
|
---|
| 839 | }
|
---|
| 840 |
|
---|
| 841 | if (tot_len < ETH_MIN_FRAME_LEN) {
|
---|
| 842 | /* ensure minimal frame length */
|
---|
| 843 | memset(&buf[tot_len], 0, ETH_MIN_FRAME_LEN - tot_len);
|
---|
| 844 | tot_len = ETH_MIN_FRAME_LEN;
|
---|
| 845 | }
|
---|
| 846 |
|
---|
| 847 | /* signal that packet should be sent */
|
---|
| 848 | if (pcap_sendpacket(pa->adapter, buf, tot_len) < 0) {
|
---|
| 849 | LINK_STATS_INC(link.memerr);
|
---|
| 850 | LINK_STATS_INC(link.drop);
|
---|
| 851 | MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
|
---|
| 852 | return ERR_BUF;
|
---|
| 853 | }
|
---|
| 854 | if (netif_is_link_up(netif)) {
|
---|
| 855 | pcapif_add_tx_packet(pa, buf, tot_len);
|
---|
| 856 | }
|
---|
| 857 |
|
---|
| 858 | LINK_STATS_INC(link.xmit);
|
---|
| 859 | MIB2_STATS_NETIF_ADD(netif, ifoutoctets, tot_len);
|
---|
| 860 | ethhdr = (struct eth_hdr *)p->payload;
|
---|
| 861 | if ((ethhdr->dest.addr[0] & 1) != 0) {
|
---|
| 862 | /* broadcast or multicast packet*/
|
---|
| 863 | MIB2_STATS_NETIF_INC(netif, ifoutnucastpkts);
|
---|
| 864 | } else {
|
---|
| 865 | /* unicast packet */
|
---|
| 866 | MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
|
---|
| 867 | }
|
---|
| 868 | return ERR_OK;
|
---|
| 869 | }
|
---|
| 870 |
|
---|
| 871 | /** low_level_input(): Allocate a pbuf and transfer the bytes of the incoming
|
---|
| 872 | * packet from the interface into the pbuf.
|
---|
| 873 | */
|
---|
| 874 | static struct pbuf *
|
---|
| 875 | pcapif_low_level_input(struct netif *netif, const void *packet, int packet_len)
|
---|
| 876 | {
|
---|
| 877 | struct pbuf *p, *q;
|
---|
| 878 | int start;
|
---|
| 879 | int length = packet_len;
|
---|
| 880 | const struct eth_addr *dest = (const struct eth_addr*)packet;
|
---|
| 881 | int unicast;
|
---|
| 882 | #if PCAPIF_FILTER_GROUP_ADDRESSES && !PCAPIF_RECEIVE_PROMISCUOUS
|
---|
| 883 | const u8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
|
---|
| 884 | const u8_t ipv4mcast[] = {0x01, 0x00, 0x5e};
|
---|
| 885 | const u8_t ipv6mcast[] = {0x33, 0x33};
|
---|
| 886 | #endif /* PCAPIF_FILTER_GROUP_ADDRESSES && !PCAPIF_RECEIVE_PROMISCUOUS */
|
---|
| 887 |
|
---|
| 888 | if (pcaipf_is_tx_packet(netif, packet, packet_len)) {
|
---|
| 889 | /* don't update counters here! */
|
---|
| 890 | return NULL;
|
---|
| 891 | }
|
---|
| 892 |
|
---|
| 893 | unicast = ((dest->addr[0] & 0x01) == 0);
|
---|
| 894 | #if !PCAPIF_RECEIVE_PROMISCUOUS
|
---|
| 895 | /* MAC filter: only let my MAC or non-unicast through (pcap receives loopback traffic, too) */
|
---|
| 896 | if (memcmp(dest, &netif->hwaddr, ETH_HWADDR_LEN) &&
|
---|
| 897 | #if PCAPIF_FILTER_GROUP_ADDRESSES
|
---|
| 898 | (memcmp(dest, ipv4mcast, 3) || ((dest->addr[3] & 0x80) != 0)) &&
|
---|
| 899 | memcmp(dest, ipv6mcast, 2) &&
|
---|
| 900 | memcmp(dest, bcast, 6)
|
---|
| 901 | #else /* PCAPIF_FILTER_GROUP_ADDRESSES */
|
---|
| 902 | unicast
|
---|
| 903 | #endif /* PCAPIF_FILTER_GROUP_ADDRESSES */
|
---|
| 904 | ) {
|
---|
| 905 | /* don't update counters here! */
|
---|
| 906 | return NULL;
|
---|
| 907 | }
|
---|
| 908 | #endif /* !PCAPIF_RECEIVE_PROMISCUOUS */
|
---|
| 909 |
|
---|
| 910 | /* We allocate a pbuf chain of pbufs from the pool. */
|
---|
| 911 | p = pbuf_alloc(PBUF_RAW, (u16_t)length + ETH_PAD_SIZE, PBUF_POOL);
|
---|
| 912 | LWIP_DEBUGF(NETIF_DEBUG, ("netif: recv length %i p->tot_len %i\n", length, (int)p->tot_len));
|
---|
| 913 |
|
---|
| 914 | if (p != NULL) {
|
---|
| 915 | /* We iterate over the pbuf chain until we have read the entire
|
---|
| 916 | packet into the pbuf. */
|
---|
| 917 | start = 0;
|
---|
| 918 | for (q = p; q != NULL; q = q->next) {
|
---|
| 919 | u16_t copy_len = q->len;
|
---|
| 920 | /* Read enough bytes to fill this pbuf in the chain. The
|
---|
| 921 | available data in the pbuf is given by the q->len
|
---|
| 922 | variable. */
|
---|
| 923 | /* read data into(q->payload, q->len); */
|
---|
| 924 | 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));
|
---|
| 925 | if (q == p) {
|
---|
| 926 | #if ETH_PAD_SIZE
|
---|
| 927 | LWIP_ASSERT("q->len >= ETH_PAD_SIZE", q->len >= ETH_PAD_SIZE);
|
---|
| 928 | copy_len -= ETH_PAD_SIZE;
|
---|
| 929 | #endif /* ETH_PAD_SIZE*/
|
---|
| 930 | MEMCPY(&((char*)q->payload)[ETH_PAD_SIZE], &((const char*)packet)[start], copy_len);
|
---|
| 931 | } else {
|
---|
| 932 | MEMCPY(q->payload, &((const char*)packet)[start], copy_len);
|
---|
| 933 | }
|
---|
| 934 | start += copy_len;
|
---|
| 935 | length -= copy_len;
|
---|
| 936 | if (length <= 0) {
|
---|
| 937 | break;
|
---|
| 938 | }
|
---|
| 939 | }
|
---|
| 940 | LINK_STATS_INC(link.recv);
|
---|
| 941 | MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len - ETH_PAD_SIZE);
|
---|
| 942 | if (unicast) {
|
---|
| 943 | MIB2_STATS_NETIF_INC(netif, ifinucastpkts);
|
---|
| 944 | } else {
|
---|
| 945 | MIB2_STATS_NETIF_INC(netif, ifinnucastpkts);
|
---|
| 946 | }
|
---|
| 947 | } else {
|
---|
| 948 | /* drop packet */
|
---|
| 949 | LINK_STATS_INC(link.memerr);
|
---|
| 950 | LINK_STATS_INC(link.drop);
|
---|
| 951 | MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
---|
| 952 | }
|
---|
| 953 |
|
---|
| 954 | return p;
|
---|
| 955 | }
|
---|
| 956 |
|
---|
| 957 | #if PCAPIF_RX_REF
|
---|
| 958 | static void
|
---|
| 959 | pcapif_rx_pbuf_free_custom(struct pbuf *p)
|
---|
| 960 | {
|
---|
| 961 | struct pcapif_pbuf_custom* ppc;
|
---|
| 962 | LWIP_ASSERT("NULL pointer", p != NULL);
|
---|
| 963 | ppc = (struct pcapif_pbuf_custom*)p;
|
---|
| 964 | LWIP_ASSERT("NULL pointer", ppc->p != NULL);
|
---|
| 965 | pbuf_free(ppc->p);
|
---|
| 966 | ppc->p = NULL;
|
---|
| 967 | mem_free(p);
|
---|
| 968 | }
|
---|
| 969 |
|
---|
| 970 | static struct pbuf*
|
---|
| 971 | pcapif_rx_ref(struct pbuf* p)
|
---|
| 972 | {
|
---|
| 973 | struct pcapif_pbuf_custom* ppc;
|
---|
| 974 | struct pbuf* q;
|
---|
| 975 |
|
---|
| 976 | LWIP_ASSERT("NULL pointer", p != NULL);
|
---|
| 977 | LWIP_ASSERT("chained pbuf not supported here", p->next == NULL);
|
---|
| 978 |
|
---|
| 979 | ppc = (struct pcapif_pbuf_custom*)mem_malloc(sizeof(struct pcapif_pbuf_custom));
|
---|
| 980 | LWIP_ASSERT("out of memory for RX", ppc != NULL);
|
---|
| 981 | ppc->pc.custom_free_function = pcapif_rx_pbuf_free_custom;
|
---|
| 982 | ppc->p = p;
|
---|
| 983 |
|
---|
| 984 | q = pbuf_alloced_custom(PBUF_RAW, p->tot_len, PBUF_REF, &ppc->pc, p->payload, p->tot_len);
|
---|
| 985 | LWIP_ASSERT("pbuf_alloced_custom returned NULL", q != NULL);
|
---|
| 986 | return q;
|
---|
| 987 | }
|
---|
| 988 | #endif /* PCAPIF_RX_REF */
|
---|
| 989 |
|
---|
| 990 | /** pcapif_input: This function is called when a packet is ready to be read
|
---|
| 991 | * from the interface. It uses the function low_level_input() that should
|
---|
| 992 | * handle the actual reception of bytes from the network interface.
|
---|
| 993 | */
|
---|
| 994 | static void
|
---|
| 995 | pcapif_input(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *packet)
|
---|
| 996 | {
|
---|
| 997 | struct pcapif_private *pa = (struct pcapif_private*)user;
|
---|
| 998 | int packet_len = pkt_header->caplen;
|
---|
| 999 | struct netif *netif = (struct netif *)pa->input_fn_arg;
|
---|
| 1000 | struct pbuf *p;
|
---|
| 1001 |
|
---|
| 1002 | PCAPIF_RX_LOCK_LWIP();
|
---|
| 1003 |
|
---|
| 1004 | /* move received packet into a new pbuf */
|
---|
| 1005 | p = pcapif_low_level_input(netif, packet, packet_len);
|
---|
| 1006 | /* if no packet could be read, silently ignore this */
|
---|
| 1007 | if (p != NULL) {
|
---|
| 1008 | #if PCAPIF_RX_REF
|
---|
| 1009 | p = pcapif_rx_ref(p);
|
---|
| 1010 | #endif
|
---|
| 1011 | /* pass all packets to ethernet_input, which decides what packets it supports */
|
---|
| 1012 | if (netif->input(p, netif) != ERR_OK) {
|
---|
| 1013 | LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
|
---|
| 1014 | pbuf_free(p);
|
---|
| 1015 | }
|
---|
| 1016 | }
|
---|
| 1017 | PCAPIF_RX_UNLOCK_LWIP();
|
---|
| 1018 | }
|
---|
| 1019 |
|
---|
| 1020 | /**
|
---|
| 1021 | * pcapif_init(): initialization function, pass to netif_add().
|
---|
| 1022 | */
|
---|
| 1023 | err_t
|
---|
| 1024 | pcapif_init(struct netif *netif)
|
---|
| 1025 | {
|
---|
| 1026 | static int ethernetif_index;
|
---|
| 1027 |
|
---|
| 1028 | int local_index;
|
---|
| 1029 | SYS_ARCH_DECL_PROTECT(lev);
|
---|
| 1030 | SYS_ARCH_PROTECT(lev);
|
---|
| 1031 | local_index = ethernetif_index++;
|
---|
| 1032 | SYS_ARCH_UNPROTECT(lev);
|
---|
| 1033 |
|
---|
| 1034 | LWIP_ASSERT("pcapif needs an input callback", netif->input != NULL);
|
---|
| 1035 |
|
---|
| 1036 | netif->name[0] = IFNAME0;
|
---|
| 1037 | netif->name[1] = (char)(IFNAME1 + local_index);
|
---|
| 1038 | netif->linkoutput = pcapif_low_level_output;
|
---|
| 1039 | #if LWIP_IPV4
|
---|
| 1040 | #if LWIP_ARP
|
---|
| 1041 | netif->output = etharp_output;
|
---|
| 1042 | #else /* LWIP_ARP */
|
---|
| 1043 | netif->output = NULL; /* not used for PPPoE */
|
---|
| 1044 | #endif /* LWIP_ARP */
|
---|
| 1045 | #endif /* LWIP_IPV4 */
|
---|
| 1046 | #if LWIP_IPV6
|
---|
| 1047 | netif->output_ip6 = ethip6_output;
|
---|
| 1048 | #endif /* LWIP_IPV6 */
|
---|
| 1049 | #if LWIP_NETIF_HOSTNAME
|
---|
| 1050 | /* Initialize interface hostname */
|
---|
| 1051 | netif_set_hostname(netif, "lwip");
|
---|
| 1052 | #endif /* LWIP_NETIF_HOSTNAME */
|
---|
| 1053 |
|
---|
| 1054 | netif->mtu = 1500;
|
---|
| 1055 | netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET | NETIF_FLAG_IGMP;
|
---|
| 1056 | #if LWIP_IPV6 && LWIP_IPV6_MLD
|
---|
| 1057 | netif->flags |= NETIF_FLAG_MLD6;
|
---|
| 1058 | #endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
|
---|
| 1059 | netif->hwaddr_len = ETH_HWADDR_LEN;
|
---|
| 1060 |
|
---|
| 1061 | NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, 100000000);
|
---|
| 1062 |
|
---|
| 1063 | /* sets link up or down based on current status */
|
---|
| 1064 | pcapif_low_level_init(netif);
|
---|
| 1065 |
|
---|
| 1066 | return ERR_OK;
|
---|
| 1067 | }
|
---|
| 1068 |
|
---|
| 1069 | #if !PCAPIF_RX_USE_THREAD
|
---|
| 1070 | void
|
---|
| 1071 | pcapif_poll(struct netif *netif)
|
---|
| 1072 | {
|
---|
| 1073 | struct pcapif_private *pa = (struct pcapif_private*)PCAPIF_GET_STATE_PTR(netif);
|
---|
| 1074 |
|
---|
| 1075 | int ret;
|
---|
| 1076 | do {
|
---|
| 1077 | if (pa->adapter != NULL) {
|
---|
| 1078 | ret = pcap_dispatch(pa->adapter, -1, pcapif_input, (u_char*)pa);
|
---|
| 1079 | } else {
|
---|
| 1080 | ret = -1;
|
---|
| 1081 | }
|
---|
| 1082 | if (ret < 0) {
|
---|
| 1083 | /* error (e.g. adapter removed or resume from standby), try to reopen the adapter */
|
---|
| 1084 | pcap_reopen_adapter(pa);
|
---|
| 1085 | }
|
---|
| 1086 | } while (ret > 0);
|
---|
| 1087 |
|
---|
| 1088 | }
|
---|
| 1089 | #endif /* !PCAPIF_RX_USE_THREAD */
|
---|
| 1090 |
|
---|
| 1091 | #endif /* LWIP_ETHERNET */
|
---|