fea8707db3
MFC after: 1 month
1218 lines
32 KiB
C
1218 lines
32 KiB
C
/*
|
|
* pcap-dag.c: Packet capture interface for Endace DAG card.
|
|
*
|
|
* The functionality of this code attempts to mimic that of pcap-linux as much
|
|
* as possible. This code is compiled in several different ways depending on
|
|
* whether DAG_ONLY and HAVE_DAG_API are defined. If HAVE_DAG_API is not
|
|
* defined it should not get compiled in, otherwise if DAG_ONLY is defined then
|
|
* the 'dag_' function calls are renamed to 'pcap_' equivalents. If DAG_ONLY
|
|
* is not defined then nothing is altered - the dag_ functions will be
|
|
* called as required from their pcap-linux/bpf equivalents.
|
|
*
|
|
* Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com)
|
|
* Modifications: Jesper Peterson <support@endace.com>
|
|
* Koryn Grant <support@endace.com>
|
|
* Stephen Donnelly <support@endace.com>
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/param.h> /* optionally get BSD define */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include "pcap-int.h"
|
|
|
|
#include <ctype.h>
|
|
#include <netinet/in.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
struct mbuf; /* Squelch compiler warnings on some platforms for */
|
|
struct rtentry; /* declarations in <net/if.h> */
|
|
#include <net/if.h>
|
|
|
|
#include "dagnew.h"
|
|
#include "dagapi.h"
|
|
|
|
#include "pcap-dag.h"
|
|
|
|
/*
|
|
* DAG devices have names beginning with "dag", followed by a number
|
|
* from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number
|
|
* from 0 to DAG_STREAM_MAX.
|
|
*/
|
|
#ifndef DAG_MAX_BOARDS
|
|
#define DAG_MAX_BOARDS 32
|
|
#endif
|
|
|
|
#define ATM_CELL_SIZE 52
|
|
#define ATM_HDR_SIZE 4
|
|
|
|
/*
|
|
* A header containing additional MTP information.
|
|
*/
|
|
#define MTP2_SENT_OFFSET 0 /* 1 byte */
|
|
#define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */
|
|
#define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */
|
|
#define MTP2_HDR_LEN 4 /* length of the header */
|
|
|
|
#define MTP2_ANNEX_A_NOT_USED 0
|
|
#define MTP2_ANNEX_A_USED 1
|
|
#define MTP2_ANNEX_A_USED_UNKNOWN 2
|
|
|
|
/* SunATM pseudo header */
|
|
struct sunatm_hdr {
|
|
unsigned char flags; /* destination and traffic type */
|
|
unsigned char vpi; /* VPI */
|
|
unsigned short vci; /* VCI */
|
|
};
|
|
|
|
/*
|
|
* Private data for capturing on DAG devices.
|
|
*/
|
|
struct pcap_dag {
|
|
struct pcap_stat stat;
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
|
|
u_char *dag_mem_top; /* DAG card current memory top pointer */
|
|
#else /* HAVE_DAG_STREAMS_API */
|
|
void *dag_mem_base; /* DAG card memory base address */
|
|
u_int dag_mem_bottom; /* DAG card current memory bottom offset */
|
|
u_int dag_mem_top; /* DAG card current memory top offset */
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
int dag_fcs_bits; /* Number of checksum bits from link layer */
|
|
int dag_offset_flags; /* Flags to pass to dag_offset(). */
|
|
int dag_stream; /* DAG stream number */
|
|
int dag_timeout; /* timeout specified to pcap_open_live.
|
|
* Same as in linux above, introduce
|
|
* generally? */
|
|
};
|
|
|
|
typedef struct pcap_dag_node {
|
|
struct pcap_dag_node *next;
|
|
pcap_t *p;
|
|
pid_t pid;
|
|
} pcap_dag_node_t;
|
|
|
|
static pcap_dag_node_t *pcap_dags = NULL;
|
|
static int atexit_handler_installed = 0;
|
|
static const unsigned short endian_test_word = 0x0100;
|
|
|
|
#define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word))
|
|
|
|
#define MAX_DAG_PACKET 65536
|
|
|
|
static unsigned char TempPkt[MAX_DAG_PACKET];
|
|
|
|
static int dag_setfilter(pcap_t *p, struct bpf_program *fp);
|
|
static int dag_stats(pcap_t *p, struct pcap_stat *ps);
|
|
static int dag_set_datalink(pcap_t *p, int dlt);
|
|
static int dag_get_datalink(pcap_t *p);
|
|
static int dag_setnonblock(pcap_t *p, int nonblock, char *errbuf);
|
|
|
|
static void
|
|
delete_pcap_dag(pcap_t *p)
|
|
{
|
|
pcap_dag_node_t *curr = NULL, *prev = NULL;
|
|
|
|
for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) {
|
|
/* empty */
|
|
}
|
|
|
|
if (curr != NULL && curr->p == p) {
|
|
if (prev != NULL) {
|
|
prev->next = curr->next;
|
|
} else {
|
|
pcap_dags = curr->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Performs a graceful shutdown of the DAG card, frees dynamic memory held
|
|
* in the pcap_t structure, and closes the file descriptor for the DAG card.
|
|
*/
|
|
|
|
static void
|
|
dag_platform_cleanup(pcap_t *p)
|
|
{
|
|
struct pcap_dag *pd;
|
|
|
|
if (p != NULL) {
|
|
pd = p->priv;
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
if(dag_stop_stream(p->fd, pd->dag_stream) < 0)
|
|
fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
|
|
|
|
if(dag_detach_stream(p->fd, pd->dag_stream) < 0)
|
|
fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
|
|
#else
|
|
if(dag_stop(p->fd) < 0)
|
|
fprintf(stderr,"dag_stop: %s\n", strerror(errno));
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
if(p->fd != -1) {
|
|
if(dag_close(p->fd) < 0)
|
|
fprintf(stderr,"dag_close: %s\n", strerror(errno));
|
|
p->fd = -1;
|
|
}
|
|
delete_pcap_dag(p);
|
|
pcap_cleanup_live_common(p);
|
|
}
|
|
/* Note: don't need to call close(p->fd) here as dag_close(p->fd) does this. */
|
|
}
|
|
|
|
static void
|
|
atexit_handler(void)
|
|
{
|
|
while (pcap_dags != NULL) {
|
|
if (pcap_dags->pid == getpid()) {
|
|
dag_platform_cleanup(pcap_dags->p);
|
|
} else {
|
|
delete_pcap_dag(pcap_dags->p);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
new_pcap_dag(pcap_t *p)
|
|
{
|
|
pcap_dag_node_t *node = NULL;
|
|
|
|
if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if (!atexit_handler_installed) {
|
|
atexit(atexit_handler);
|
|
atexit_handler_installed = 1;
|
|
}
|
|
|
|
node->next = pcap_dags;
|
|
node->p = p;
|
|
node->pid = getpid();
|
|
|
|
pcap_dags = node;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int
|
|
dag_erf_ext_header_count(uint8_t * erf, size_t len)
|
|
{
|
|
uint32_t hdr_num = 0;
|
|
uint8_t hdr_type;
|
|
|
|
/* basic sanity checks */
|
|
if ( erf == NULL )
|
|
return 0;
|
|
if ( len < 16 )
|
|
return 0;
|
|
|
|
/* check if we have any extension headers */
|
|
if ( (erf[8] & 0x80) == 0x00 )
|
|
return 0;
|
|
|
|
/* loop over the extension headers */
|
|
do {
|
|
|
|
/* sanity check we have enough bytes */
|
|
if ( len < (24 + (hdr_num * 8)) )
|
|
return hdr_num;
|
|
|
|
/* get the header type */
|
|
hdr_type = erf[(16 + (hdr_num * 8))];
|
|
hdr_num++;
|
|
|
|
} while ( hdr_type & 0x80 );
|
|
|
|
return hdr_num;
|
|
}
|
|
|
|
/*
|
|
* Read at most max_packets from the capture stream and call the callback
|
|
* for each of them. Returns the number of packets handled, -1 if an
|
|
* error occured, or -2 if we were told to break out of the loop.
|
|
*/
|
|
static int
|
|
dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
|
|
{
|
|
struct pcap_dag *pd = p->priv;
|
|
unsigned int processed = 0;
|
|
int flags = pd->dag_offset_flags;
|
|
unsigned int nonblocking = flags & DAGF_NONBLOCK;
|
|
unsigned int num_ext_hdr = 0;
|
|
|
|
/* Get the next bufferful of packets (if necessary). */
|
|
while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) {
|
|
|
|
/*
|
|
* Has "pcap_breakloop()" been called?
|
|
*/
|
|
if (p->break_loop) {
|
|
/*
|
|
* Yes - clear the flag that indicates that
|
|
* it has, and return -2 to indicate that
|
|
* we were told to break out of the loop.
|
|
*/
|
|
p->break_loop = 0;
|
|
return -2;
|
|
}
|
|
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
/* dag_advance_stream() will block (unless nonblock is called)
|
|
* until 64kB of data has accumulated.
|
|
* If to_ms is set, it will timeout before 64kB has accumulated.
|
|
* We wait for 64kB because processing a few packets at a time
|
|
* can cause problems at high packet rates (>200kpps) due
|
|
* to inefficiencies.
|
|
* This does mean if to_ms is not specified the capture may 'hang'
|
|
* for long periods if the data rate is extremely slow (<64kB/sec)
|
|
* If non-block is specified it will return immediately. The user
|
|
* is then responsible for efficiency.
|
|
*/
|
|
if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) {
|
|
return -1;
|
|
}
|
|
#else
|
|
/* dag_offset does not support timeouts */
|
|
pd->dag_mem_top = dag_offset(p->fd, &(pd->dag_mem_bottom), flags);
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
|
|
if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
|
|
{
|
|
/* Pcap is configured to process only available packets, and there aren't any, return immediately. */
|
|
return 0;
|
|
}
|
|
|
|
if(!nonblocking &&
|
|
pd->dag_timeout &&
|
|
(pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size))
|
|
{
|
|
/* Blocking mode, but timeout set and no data has arrived, return anyway.*/
|
|
return 0;
|
|
}
|
|
|
|
}
|
|
|
|
/* Process the packets. */
|
|
while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) {
|
|
|
|
unsigned short packet_len = 0;
|
|
int caplen = 0;
|
|
struct pcap_pkthdr pcap_header;
|
|
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom);
|
|
#else
|
|
dag_record_t *header = (dag_record_t *)(pd->dag_mem_base + pd->dag_mem_bottom);
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
|
|
u_char *dp = ((u_char *)header); /* + dag_record_size; */
|
|
unsigned short rlen;
|
|
|
|
/*
|
|
* Has "pcap_breakloop()" been called?
|
|
*/
|
|
if (p->break_loop) {
|
|
/*
|
|
* Yes - clear the flag that indicates that
|
|
* it has, and return -2 to indicate that
|
|
* we were told to break out of the loop.
|
|
*/
|
|
p->break_loop = 0;
|
|
return -2;
|
|
}
|
|
|
|
rlen = ntohs(header->rlen);
|
|
if (rlen < dag_record_size)
|
|
{
|
|
strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE);
|
|
return -1;
|
|
}
|
|
pd->dag_mem_bottom += rlen;
|
|
|
|
/* Count lost packets. */
|
|
switch((header->type & 0x7f)) {
|
|
/* in these types the color value overwrites the lctr */
|
|
case TYPE_COLOR_HDLC_POS:
|
|
case TYPE_COLOR_ETH:
|
|
case TYPE_DSM_COLOR_HDLC_POS:
|
|
case TYPE_DSM_COLOR_ETH:
|
|
case TYPE_COLOR_MC_HDLC_POS:
|
|
case TYPE_COLOR_HASH_ETH:
|
|
case TYPE_COLOR_HASH_POS:
|
|
break;
|
|
|
|
default:
|
|
if (header->lctr) {
|
|
if (pd->stat.ps_drop > (UINT_MAX - ntohs(header->lctr))) {
|
|
pd->stat.ps_drop = UINT_MAX;
|
|
} else {
|
|
pd->stat.ps_drop += ntohs(header->lctr);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((header->type & 0x7f) == TYPE_PAD) {
|
|
continue;
|
|
}
|
|
|
|
num_ext_hdr = dag_erf_ext_header_count(dp, rlen);
|
|
|
|
/* ERF encapsulation */
|
|
/* The Extensible Record Format is not dropped for this kind of encapsulation,
|
|
* and will be handled as a pseudo header by the decoding application.
|
|
* The information carried in the ERF header and in the optional subheader (if present)
|
|
* could be merged with the libpcap information, to offer a better decoding.
|
|
* The packet length is
|
|
* o the length of the packet on the link (header->wlen),
|
|
* o plus the length of the ERF header (dag_record_size), as the length of the
|
|
* pseudo header will be adjusted during the decoding,
|
|
* o plus the length of the optional subheader (if present).
|
|
*
|
|
* The capture length is header.rlen and the byte stuffing for alignment will be dropped
|
|
* if the capture length is greater than the packet length.
|
|
*/
|
|
if (p->linktype == DLT_ERF) {
|
|
packet_len = ntohs(header->wlen) + dag_record_size;
|
|
caplen = rlen;
|
|
switch ((header->type & 0x7f)) {
|
|
case TYPE_MC_AAL5:
|
|
case TYPE_MC_ATM:
|
|
case TYPE_MC_HDLC:
|
|
case TYPE_MC_RAW_CHANNEL:
|
|
case TYPE_MC_RAW:
|
|
case TYPE_MC_AAL2:
|
|
case TYPE_COLOR_MC_HDLC_POS:
|
|
packet_len += 4; /* MC header */
|
|
break;
|
|
|
|
case TYPE_COLOR_HASH_ETH:
|
|
case TYPE_DSM_COLOR_ETH:
|
|
case TYPE_COLOR_ETH:
|
|
case TYPE_ETH:
|
|
packet_len += 2; /* ETH header */
|
|
break;
|
|
} /* switch type */
|
|
|
|
/* Include ERF extension headers */
|
|
packet_len += (8 * num_ext_hdr);
|
|
|
|
if (caplen > packet_len) {
|
|
caplen = packet_len;
|
|
}
|
|
} else {
|
|
/* Other kind of encapsulation according to the header Type */
|
|
|
|
/* Skip over generic ERF header */
|
|
dp += dag_record_size;
|
|
/* Skip over extension headers */
|
|
dp += 8 * num_ext_hdr;
|
|
|
|
switch((header->type & 0x7f)) {
|
|
case TYPE_ATM:
|
|
case TYPE_AAL5:
|
|
if (header->type == TYPE_AAL5) {
|
|
packet_len = ntohs(header->wlen);
|
|
caplen = rlen - dag_record_size;
|
|
}
|
|
case TYPE_MC_ATM:
|
|
if (header->type == TYPE_MC_ATM) {
|
|
caplen = packet_len = ATM_CELL_SIZE;
|
|
dp+=4;
|
|
}
|
|
case TYPE_MC_AAL5:
|
|
if (header->type == TYPE_MC_AAL5) {
|
|
packet_len = ntohs(header->wlen);
|
|
caplen = rlen - dag_record_size - 4;
|
|
dp+=4;
|
|
}
|
|
if (header->type == TYPE_ATM) {
|
|
caplen = packet_len = ATM_CELL_SIZE;
|
|
}
|
|
if (p->linktype == DLT_SUNATM) {
|
|
struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp;
|
|
unsigned long rawatm;
|
|
|
|
rawatm = ntohl(*((unsigned long *)dp));
|
|
sunatm->vci = htons((rawatm >> 4) & 0xffff);
|
|
sunatm->vpi = (rawatm >> 20) & 0x00ff;
|
|
sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) |
|
|
((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 :
|
|
((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 :
|
|
((dp[ATM_HDR_SIZE] == 0xaa &&
|
|
dp[ATM_HDR_SIZE+1] == 0xaa &&
|
|
dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1)));
|
|
|
|
} else {
|
|
packet_len -= ATM_HDR_SIZE;
|
|
caplen -= ATM_HDR_SIZE;
|
|
dp += ATM_HDR_SIZE;
|
|
}
|
|
break;
|
|
|
|
case TYPE_COLOR_HASH_ETH:
|
|
case TYPE_DSM_COLOR_ETH:
|
|
case TYPE_COLOR_ETH:
|
|
case TYPE_ETH:
|
|
packet_len = ntohs(header->wlen);
|
|
packet_len -= (pd->dag_fcs_bits >> 3);
|
|
caplen = rlen - dag_record_size - 2;
|
|
if (caplen > packet_len) {
|
|
caplen = packet_len;
|
|
}
|
|
dp += 2;
|
|
break;
|
|
|
|
case TYPE_COLOR_HASH_POS:
|
|
case TYPE_DSM_COLOR_HDLC_POS:
|
|
case TYPE_COLOR_HDLC_POS:
|
|
case TYPE_HDLC_POS:
|
|
packet_len = ntohs(header->wlen);
|
|
packet_len -= (pd->dag_fcs_bits >> 3);
|
|
caplen = rlen - dag_record_size;
|
|
if (caplen > packet_len) {
|
|
caplen = packet_len;
|
|
}
|
|
break;
|
|
|
|
case TYPE_COLOR_MC_HDLC_POS:
|
|
case TYPE_MC_HDLC:
|
|
packet_len = ntohs(header->wlen);
|
|
packet_len -= (pd->dag_fcs_bits >> 3);
|
|
caplen = rlen - dag_record_size - 4;
|
|
if (caplen > packet_len) {
|
|
caplen = packet_len;
|
|
}
|
|
/* jump the MC_HDLC_HEADER */
|
|
dp += 4;
|
|
#ifdef DLT_MTP2_WITH_PHDR
|
|
if (p->linktype == DLT_MTP2_WITH_PHDR) {
|
|
/* Add the MTP2 Pseudo Header */
|
|
caplen += MTP2_HDR_LEN;
|
|
packet_len += MTP2_HDR_LEN;
|
|
|
|
TempPkt[MTP2_SENT_OFFSET] = 0;
|
|
TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN;
|
|
*(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01);
|
|
*(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff);
|
|
memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen);
|
|
dp = TempPkt;
|
|
}
|
|
#endif
|
|
break;
|
|
|
|
case TYPE_IPV4:
|
|
case TYPE_IPV6:
|
|
packet_len = ntohs(header->wlen);
|
|
caplen = rlen - dag_record_size;
|
|
if (caplen > packet_len) {
|
|
caplen = packet_len;
|
|
}
|
|
break;
|
|
|
|
/* These types have no matching 'native' DLT, but can be used with DLT_ERF above */
|
|
case TYPE_MC_RAW:
|
|
case TYPE_MC_RAW_CHANNEL:
|
|
case TYPE_IP_COUNTER:
|
|
case TYPE_TCP_FLOW_COUNTER:
|
|
case TYPE_INFINIBAND:
|
|
case TYPE_RAW_LINK:
|
|
case TYPE_INFINIBAND_LINK:
|
|
default:
|
|
/* Unhandled ERF type.
|
|
* Ignore rather than generating error
|
|
*/
|
|
continue;
|
|
} /* switch type */
|
|
|
|
/* Skip over extension headers */
|
|
caplen -= (8 * num_ext_hdr);
|
|
|
|
} /* ERF encapsulation */
|
|
|
|
if (caplen > p->snapshot)
|
|
caplen = p->snapshot;
|
|
|
|
/* Run the packet filter if there is one. */
|
|
if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) {
|
|
|
|
/* convert between timestamp formats */
|
|
register unsigned long long ts;
|
|
|
|
if (IS_BIGENDIAN()) {
|
|
ts = SWAPLL(header->ts);
|
|
} else {
|
|
ts = header->ts;
|
|
}
|
|
|
|
pcap_header.ts.tv_sec = ts >> 32;
|
|
ts = (ts & 0xffffffffULL) * 1000000;
|
|
ts += 0x80000000; /* rounding */
|
|
pcap_header.ts.tv_usec = ts >> 32;
|
|
if (pcap_header.ts.tv_usec >= 1000000) {
|
|
pcap_header.ts.tv_usec -= 1000000;
|
|
pcap_header.ts.tv_sec++;
|
|
}
|
|
|
|
/* Fill in our own header data */
|
|
pcap_header.caplen = caplen;
|
|
pcap_header.len = packet_len;
|
|
|
|
/* Count the packet. */
|
|
pd->stat.ps_recv++;
|
|
|
|
/* Call the user supplied callback function */
|
|
callback(user, &pcap_header, dp);
|
|
|
|
/* Only count packets that pass the filter, for consistency with standard Linux behaviour. */
|
|
processed++;
|
|
if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
|
|
{
|
|
/* Reached the user-specified limit. */
|
|
return cnt;
|
|
}
|
|
}
|
|
}
|
|
|
|
return processed;
|
|
}
|
|
|
|
static int
|
|
dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
|
|
{
|
|
strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards",
|
|
PCAP_ERRBUF_SIZE);
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Get a handle for a live capture from the given DAG device. Passing a NULL
|
|
* device will result in a failure. The promisc flag is ignored because DAG
|
|
* cards are always promiscuous. The to_ms parameter is used in setting the
|
|
* API polling parameters.
|
|
*
|
|
* snaplen is now also ignored, until we get per-stream slen support. Set
|
|
* slen with approprite DAG tool BEFORE pcap_activate().
|
|
*
|
|
* See also pcap(3).
|
|
*/
|
|
static int dag_activate(pcap_t* handle)
|
|
{
|
|
struct pcap_dag *handlep = handle->priv;
|
|
#if 0
|
|
char conf[30]; /* dag configure string */
|
|
#endif
|
|
char *s;
|
|
int n;
|
|
daginf_t* daginf;
|
|
char * newDev = NULL;
|
|
char * device = handle->opt.source;
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
uint32_t mindata;
|
|
struct timeval maxwait;
|
|
struct timeval poll;
|
|
#endif
|
|
|
|
if (device == NULL) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "device is NULL: %s", pcap_strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* Initialize some components of the pcap structure. */
|
|
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
newDev = (char *)malloc(strlen(device) + 16);
|
|
if (newDev == NULL) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s\n", pcap_strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
/* Parse input name to get dag device and stream number if provided */
|
|
if (dag_parse_name(device, newDev, strlen(device) + 16, &handlep->dag_stream) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: %s\n", pcap_strerror(errno));
|
|
goto fail;
|
|
}
|
|
device = newDev;
|
|
|
|
if (handlep->dag_stream%2) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture\n");
|
|
goto fail;
|
|
}
|
|
#else
|
|
if (strncmp(device, "/dev/", 5) != 0) {
|
|
newDev = (char *)malloc(strlen(device) + 5);
|
|
if (newDev == NULL) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "Can't allocate string for device name: %s\n", pcap_strerror(errno));
|
|
goto fail;
|
|
}
|
|
strcpy(newDev, "/dev/");
|
|
strcat(newDev, device);
|
|
device = newDev;
|
|
}
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
|
|
/* setup device parameters */
|
|
if((handle->fd = dag_open((char *)device)) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_open %s: %s", device, pcap_strerror(errno));
|
|
goto fail;
|
|
}
|
|
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
/* Open requested stream. Can fail if already locked or on error */
|
|
if (dag_attach_stream(handle->fd, handlep->dag_stream, 0, 0) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_attach_stream: %s\n", pcap_strerror(errno));
|
|
goto failclose;
|
|
}
|
|
|
|
/* Set up default poll parameters for stream
|
|
* Can be overridden by pcap_set_nonblock()
|
|
*/
|
|
if (dag_get_stream_poll(handle->fd, handlep->dag_stream,
|
|
&mindata, &maxwait, &poll) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s\n", pcap_strerror(errno));
|
|
goto faildetach;
|
|
}
|
|
|
|
if (handle->opt.immediate) {
|
|
/* Call callback immediately.
|
|
* XXX - is this the right way to handle this?
|
|
*/
|
|
mindata = 0;
|
|
} else {
|
|
/* Amount of data to collect in Bytes before calling callbacks.
|
|
* Important for efficiency, but can introduce latency
|
|
* at low packet rates if to_ms not set!
|
|
*/
|
|
mindata = 65536;
|
|
}
|
|
|
|
/* Obey opt.timeout (was to_ms) if supplied. This is a good idea!
|
|
* Recommend 10-100ms. Calls will time out even if no data arrived.
|
|
*/
|
|
maxwait.tv_sec = handle->opt.timeout/1000;
|
|
maxwait.tv_usec = (handle->opt.timeout%1000) * 1000;
|
|
|
|
if (dag_set_stream_poll(handle->fd, handlep->dag_stream,
|
|
mindata, &maxwait, &poll) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s\n", pcap_strerror(errno));
|
|
goto faildetach;
|
|
}
|
|
|
|
#else
|
|
if((handlep->dag_mem_base = dag_mmap(handle->fd)) == MAP_FAILED) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_mmap %s: %s\n", device, pcap_strerror(errno));
|
|
goto failclose;
|
|
}
|
|
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
|
|
/* XXX Not calling dag_configure() to set slen; this is unsafe in
|
|
* multi-stream environments as the gpp config is global.
|
|
* Once the firmware provides 'per-stream slen' this can be supported
|
|
* again via the Config API without side-effects */
|
|
#if 0
|
|
/* set the card snap length to the specified snaplen parameter */
|
|
/* This is a really bad idea, as different cards have different
|
|
* valid slen ranges. Should fix in Config API. */
|
|
if (handle->snapshot == 0 || handle->snapshot > MAX_DAG_SNAPLEN) {
|
|
handle->snapshot = MAX_DAG_SNAPLEN;
|
|
} else if (snaplen < MIN_DAG_SNAPLEN) {
|
|
handle->snapshot = MIN_DAG_SNAPLEN;
|
|
}
|
|
/* snap len has to be a multiple of 4 */
|
|
snprintf(conf, 30, "varlen slen=%d", (snaplen + 3) & ~3);
|
|
|
|
if(dag_configure(handle->fd, conf) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,"dag_configure %s: %s\n", device, pcap_strerror(errno));
|
|
goto faildetach;
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
if(dag_start_stream(handle->fd, handlep->dag_stream) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start_stream %s: %s\n", device, pcap_strerror(errno));
|
|
goto faildetach;
|
|
}
|
|
#else
|
|
if(dag_start(handle->fd) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "dag_start %s: %s\n", device, pcap_strerror(errno));
|
|
goto failclose;
|
|
}
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
|
|
/*
|
|
* Important! You have to ensure bottom is properly
|
|
* initialized to zero on startup, it won't give you
|
|
* a compiler warning if you make this mistake!
|
|
*/
|
|
handlep->dag_mem_bottom = 0;
|
|
handlep->dag_mem_top = 0;
|
|
|
|
/*
|
|
* Find out how many FCS bits we should strip.
|
|
* First, query the card to see if it strips the FCS.
|
|
*/
|
|
daginf = dag_info(handle->fd);
|
|
if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) {
|
|
/* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */
|
|
handlep->dag_fcs_bits = 0;
|
|
|
|
/* Note that no FCS will be supplied. */
|
|
handle->linktype_ext = LT_FCS_DATALINK_EXT(0);
|
|
} else {
|
|
/*
|
|
* Start out assuming it's 32 bits.
|
|
*/
|
|
handlep->dag_fcs_bits = 32;
|
|
|
|
/* Allow an environment variable to override. */
|
|
if ((s = getenv("ERF_FCS_BITS")) != NULL) {
|
|
if ((n = atoi(s)) == 0 || n == 16 || n == 32) {
|
|
handlep->dag_fcs_bits = n;
|
|
} else {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
|
|
"pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment\n", device, n);
|
|
goto failstop;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Did the user request that they not be stripped?
|
|
*/
|
|
if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) {
|
|
/* Yes. Note the number of bytes that will be
|
|
supplied. */
|
|
handle->linktype_ext = LT_FCS_DATALINK_EXT(handlep->dag_fcs_bits/16);
|
|
|
|
/* And don't strip them. */
|
|
handlep->dag_fcs_bits = 0;
|
|
}
|
|
}
|
|
|
|
handlep->dag_timeout = handle->opt.timeout;
|
|
|
|
handle->linktype = -1;
|
|
if (dag_get_datalink(handle) < 0)
|
|
goto failstop;
|
|
|
|
handle->bufsize = 0;
|
|
|
|
if (new_pcap_dag(handle) < 0) {
|
|
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "new_pcap_dag %s: %s\n", device, pcap_strerror(errno));
|
|
goto failstop;
|
|
}
|
|
|
|
/*
|
|
* "select()" and "poll()" don't work on DAG device descriptors.
|
|
*/
|
|
handle->selectable_fd = -1;
|
|
|
|
if (newDev != NULL) {
|
|
free((char *)newDev);
|
|
}
|
|
|
|
handle->read_op = dag_read;
|
|
handle->inject_op = dag_inject;
|
|
handle->setfilter_op = dag_setfilter;
|
|
handle->setdirection_op = NULL; /* Not implemented.*/
|
|
handle->set_datalink_op = dag_set_datalink;
|
|
handle->getnonblock_op = pcap_getnonblock_fd;
|
|
handle->setnonblock_op = dag_setnonblock;
|
|
handle->stats_op = dag_stats;
|
|
handle->cleanup_op = dag_platform_cleanup;
|
|
handlep->stat.ps_drop = 0;
|
|
handlep->stat.ps_recv = 0;
|
|
handlep->stat.ps_ifdrop = 0;
|
|
return 0;
|
|
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
failstop:
|
|
if (dag_stop_stream(handle->fd, handlep->dag_stream) < 0) {
|
|
fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
|
|
}
|
|
|
|
faildetach:
|
|
if (dag_detach_stream(handle->fd, handlep->dag_stream) < 0)
|
|
fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
|
|
#else
|
|
failstop:
|
|
if (dag_stop(handle->fd) < 0)
|
|
fprintf(stderr,"dag_stop: %s\n", strerror(errno));
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
|
|
failclose:
|
|
if (dag_close(handle->fd) < 0)
|
|
fprintf(stderr,"dag_close: %s\n", strerror(errno));
|
|
delete_pcap_dag(handle);
|
|
|
|
fail:
|
|
pcap_cleanup_live_common(handle);
|
|
if (newDev != NULL) {
|
|
free((char *)newDev);
|
|
}
|
|
|
|
return PCAP_ERROR;
|
|
}
|
|
|
|
pcap_t *dag_create(const char *device, char *ebuf, int *is_ours)
|
|
{
|
|
const char *cp;
|
|
char *cpend;
|
|
long devnum;
|
|
pcap_t *p;
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
long stream = 0;
|
|
#endif
|
|
|
|
/* Does this look like a DAG device? */
|
|
cp = strrchr(device, '/');
|
|
if (cp == NULL)
|
|
cp = device;
|
|
/* Does it begin with "dag"? */
|
|
if (strncmp(cp, "dag", 3) != 0) {
|
|
/* Nope, doesn't begin with "dag" */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
/* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */
|
|
cp += 3;
|
|
devnum = strtol(cp, &cpend, 10);
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
if (*cpend == ':') {
|
|
/* Followed by a stream number. */
|
|
stream = strtol(++cpend, &cpend, 10);
|
|
}
|
|
#endif
|
|
if (cpend == cp || *cpend != '\0') {
|
|
/* Not followed by a number. */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
if (devnum < 0 || devnum >= DAG_MAX_BOARDS) {
|
|
/* Followed by a non-valid number. */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
if (stream <0 || stream >= DAG_STREAM_MAX) {
|
|
/* Followed by a non-valid stream number. */
|
|
*is_ours = 0;
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/* OK, it's probably ours. */
|
|
*is_ours = 1;
|
|
|
|
p = pcap_create_common(device, ebuf, sizeof (struct pcap_dag));
|
|
if (p == NULL)
|
|
return NULL;
|
|
|
|
p->activate_op = dag_activate;
|
|
return p;
|
|
}
|
|
|
|
static int
|
|
dag_stats(pcap_t *p, struct pcap_stat *ps) {
|
|
struct pcap_dag *pd = p->priv;
|
|
|
|
/* This needs to be filled out correctly. Hopefully a dagapi call will
|
|
provide all necessary information.
|
|
*/
|
|
/*pd->stat.ps_recv = 0;*/
|
|
/*pd->stat.ps_drop = 0;*/
|
|
|
|
*ps = pd->stat;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Previously we just generated a list of all possible names and let
|
|
* pcap_add_if() attempt to open each one, but with streams this adds up
|
|
* to 81 possibilities which is inefficient.
|
|
*
|
|
* Since we know more about the devices we can prune the tree here.
|
|
* pcap_add_if() will still retest each device but the total number of
|
|
* open attempts will still be much less than the naive approach.
|
|
*/
|
|
int
|
|
dag_findalldevs(pcap_if_t **devlistp, char *errbuf)
|
|
{
|
|
char name[12]; /* XXX - pick a size */
|
|
int ret = 0;
|
|
int c;
|
|
char dagname[DAGNAME_BUFSIZE];
|
|
int dagstream;
|
|
int dagfd;
|
|
|
|
/* Try all the DAGs 0-DAG_MAX_BOARDS */
|
|
for (c = 0; c < DAG_MAX_BOARDS; c++) {
|
|
snprintf(name, 12, "dag%d", c);
|
|
if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream))
|
|
{
|
|
return -1;
|
|
}
|
|
if ( (dagfd = dag_open(dagname)) >= 0 ) {
|
|
if (pcap_add_if(devlistp, name, 0, NULL, errbuf) == -1) {
|
|
/*
|
|
* Failure.
|
|
*/
|
|
ret = -1;
|
|
}
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
{
|
|
int stream, rxstreams;
|
|
rxstreams = dag_rx_get_stream_count(dagfd);
|
|
for(stream=0;stream<DAG_STREAM_MAX;stream+=2) {
|
|
if (0 == dag_attach_stream(dagfd, stream, 0, 0)) {
|
|
dag_detach_stream(dagfd, stream);
|
|
|
|
snprintf(name, 10, "dag%d:%d", c, stream);
|
|
if (pcap_add_if(devlistp, name, 0, NULL, errbuf) == -1) {
|
|
/*
|
|
* Failure.
|
|
*/
|
|
ret = -1;
|
|
}
|
|
|
|
rxstreams--;
|
|
if(rxstreams <= 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
dag_close(dagfd);
|
|
}
|
|
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Installs the given bpf filter program in the given pcap structure. There is
|
|
* no attempt to store the filter in kernel memory as that is not supported
|
|
* with DAG cards.
|
|
*/
|
|
static int
|
|
dag_setfilter(pcap_t *p, struct bpf_program *fp)
|
|
{
|
|
if (!p)
|
|
return -1;
|
|
if (!fp) {
|
|
strncpy(p->errbuf, "setfilter: No filter specified",
|
|
sizeof(p->errbuf));
|
|
return -1;
|
|
}
|
|
|
|
/* Make our private copy of the filter */
|
|
|
|
if (install_bpf_program(p, fp) < 0)
|
|
return -1;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
dag_set_datalink(pcap_t *p, int dlt)
|
|
{
|
|
p->linktype = dlt;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
dag_setnonblock(pcap_t *p, int nonblock, char *errbuf)
|
|
{
|
|
struct pcap_dag *pd = p->priv;
|
|
|
|
/*
|
|
* Set non-blocking mode on the FD.
|
|
* XXX - is that necessary? If not, don't bother calling it,
|
|
* and have a "dag_getnonblock()" function that looks at
|
|
* "pd->dag_offset_flags".
|
|
*/
|
|
if (pcap_setnonblock_fd(p, nonblock, errbuf) < 0)
|
|
return (-1);
|
|
#ifdef HAVE_DAG_STREAMS_API
|
|
{
|
|
uint32_t mindata;
|
|
struct timeval maxwait;
|
|
struct timeval poll;
|
|
|
|
if (dag_get_stream_poll(p->fd, pd->dag_stream,
|
|
&mindata, &maxwait, &poll) < 0) {
|
|
snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_get_stream_poll: %s\n", pcap_strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* Amount of data to collect in Bytes before calling callbacks.
|
|
* Important for efficiency, but can introduce latency
|
|
* at low packet rates if to_ms not set!
|
|
*/
|
|
if(nonblock)
|
|
mindata = 0;
|
|
else
|
|
mindata = 65536;
|
|
|
|
if (dag_set_stream_poll(p->fd, pd->dag_stream,
|
|
mindata, &maxwait, &poll) < 0) {
|
|
snprintf(errbuf, PCAP_ERRBUF_SIZE, "dag_set_stream_poll: %s\n", pcap_strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
#endif /* HAVE_DAG_STREAMS_API */
|
|
if (nonblock) {
|
|
pd->dag_offset_flags |= DAGF_NONBLOCK;
|
|
} else {
|
|
pd->dag_offset_flags &= ~DAGF_NONBLOCK;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
dag_get_datalink(pcap_t *p)
|
|
{
|
|
struct pcap_dag *pd = p->priv;
|
|
int index=0, dlt_index=0;
|
|
uint8_t types[255];
|
|
|
|
memset(types, 0, 255);
|
|
|
|
if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) {
|
|
(void)snprintf(p->errbuf, sizeof(p->errbuf), "malloc: %s", pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
p->linktype = 0;
|
|
|
|
#ifdef HAVE_DAG_GET_STREAM_ERF_TYPES
|
|
/* Get list of possible ERF types for this card */
|
|
if (dag_get_stream_erf_types(p->fd, pd->dag_stream, types, 255) < 0) {
|
|
snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_stream_erf_types: %s", pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
while (types[index]) {
|
|
|
|
#elif defined HAVE_DAG_GET_ERF_TYPES
|
|
/* Get list of possible ERF types for this card */
|
|
if (dag_get_erf_types(p->fd, types, 255) < 0) {
|
|
snprintf(p->errbuf, sizeof(p->errbuf), "dag_get_erf_types: %s", pcap_strerror(errno));
|
|
return (-1);
|
|
}
|
|
|
|
while (types[index]) {
|
|
#else
|
|
/* Check the type through a dagapi call. */
|
|
types[index] = dag_linktype(p->fd);
|
|
|
|
{
|
|
#endif
|
|
switch((types[index] & 0x7f)) {
|
|
|
|
case TYPE_HDLC_POS:
|
|
case TYPE_COLOR_HDLC_POS:
|
|
case TYPE_DSM_COLOR_HDLC_POS:
|
|
case TYPE_COLOR_HASH_POS:
|
|
|
|
if (p->dlt_list != NULL) {
|
|
p->dlt_list[dlt_index++] = DLT_CHDLC;
|
|
p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
|
|
p->dlt_list[dlt_index++] = DLT_FRELAY;
|
|
}
|
|
if(!p->linktype)
|
|
p->linktype = DLT_CHDLC;
|
|
break;
|
|
|
|
case TYPE_ETH:
|
|
case TYPE_COLOR_ETH:
|
|
case TYPE_DSM_COLOR_ETH:
|
|
case TYPE_COLOR_HASH_ETH:
|
|
/*
|
|
* This is (presumably) a real Ethernet capture; give it a
|
|
* link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
|
|
* that an application can let you choose it, in case you're
|
|
* capturing DOCSIS traffic that a Cisco Cable Modem
|
|
* Termination System is putting out onto an Ethernet (it
|
|
* doesn't put an Ethernet header onto the wire, it puts raw
|
|
* DOCSIS frames out on the wire inside the low-level
|
|
* Ethernet framing).
|
|
*/
|
|
if (p->dlt_list != NULL) {
|
|
p->dlt_list[dlt_index++] = DLT_EN10MB;
|
|
p->dlt_list[dlt_index++] = DLT_DOCSIS;
|
|
}
|
|
if(!p->linktype)
|
|
p->linktype = DLT_EN10MB;
|
|
break;
|
|
|
|
case TYPE_ATM:
|
|
case TYPE_AAL5:
|
|
case TYPE_MC_ATM:
|
|
case TYPE_MC_AAL5:
|
|
if (p->dlt_list != NULL) {
|
|
p->dlt_list[dlt_index++] = DLT_ATM_RFC1483;
|
|
p->dlt_list[dlt_index++] = DLT_SUNATM;
|
|
}
|
|
if(!p->linktype)
|
|
p->linktype = DLT_ATM_RFC1483;
|
|
break;
|
|
|
|
case TYPE_COLOR_MC_HDLC_POS:
|
|
case TYPE_MC_HDLC:
|
|
if (p->dlt_list != NULL) {
|
|
p->dlt_list[dlt_index++] = DLT_CHDLC;
|
|
p->dlt_list[dlt_index++] = DLT_PPP_SERIAL;
|
|
p->dlt_list[dlt_index++] = DLT_FRELAY;
|
|
p->dlt_list[dlt_index++] = DLT_MTP2;
|
|
p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR;
|
|
p->dlt_list[dlt_index++] = DLT_LAPD;
|
|
}
|
|
if(!p->linktype)
|
|
p->linktype = DLT_CHDLC;
|
|
break;
|
|
|
|
case TYPE_IPV4:
|
|
case TYPE_IPV6:
|
|
if(!p->linktype)
|
|
p->linktype = DLT_RAW;
|
|
break;
|
|
|
|
case TYPE_LEGACY:
|
|
case TYPE_MC_RAW:
|
|
case TYPE_MC_RAW_CHANNEL:
|
|
case TYPE_IP_COUNTER:
|
|
case TYPE_TCP_FLOW_COUNTER:
|
|
case TYPE_INFINIBAND:
|
|
case TYPE_RAW_LINK:
|
|
case TYPE_INFINIBAND_LINK:
|
|
default:
|
|
/* Libpcap cannot deal with these types yet */
|
|
/* Add no 'native' DLTs, but still covered by DLT_ERF */
|
|
break;
|
|
|
|
} /* switch */
|
|
index++;
|
|
}
|
|
|
|
p->dlt_list[dlt_index++] = DLT_ERF;
|
|
|
|
p->dlt_count = dlt_index;
|
|
|
|
if(!p->linktype)
|
|
p->linktype = DLT_ERF;
|
|
|
|
return p->linktype;
|
|
}
|