/*
* pcap-dag.c: Packet capture interface for Endace DAG cards.
*
* 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
* Koryn Grant
* Stephen Donnelly <stephen.donnelly@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 "dagpci.h"
#include "dag_config_api.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
#ifndef ERF_TYPE_AAL5
#define ERF_TYPE_AAL5 4
#endif
#ifndef ERF_TYPE_MC_HDLC
#define ERF_TYPE_MC_HDLC 5
#endif
#ifndef ERF_TYPE_MC_RAW
#define ERF_TYPE_MC_RAW 6
#endif
#ifndef ERF_TYPE_MC_ATM
#define ERF_TYPE_MC_ATM 7
#endif
#ifndef ERF_TYPE_MC_RAW_CHANNEL
#define ERF_TYPE_MC_RAW_CHANNEL 8
#endif
#ifndef ERF_TYPE_MC_AAL5
#define ERF_TYPE_MC_AAL5 9
#endif
#ifndef ERF_TYPE_COLOR_HDLC_POS
#define ERF_TYPE_COLOR_HDLC_POS 10
#endif
#ifndef ERF_TYPE_COLOR_ETH
#define ERF_TYPE_COLOR_ETH 11
#endif
#ifndef ERF_TYPE_MC_AAL2
#define ERF_TYPE_MC_AAL2 12
#endif
#ifndef ERF_TYPE_IP_COUNTER
#define ERF_TYPE_IP_COUNTER 13
#endif
#ifndef ERF_TYPE_TCP_FLOW_COUNTER
#define ERF_TYPE_TCP_FLOW_COUNTER 14
#endif
#ifndef ERF_TYPE_DSM_COLOR_HDLC_POS
#define ERF_TYPE_DSM_COLOR_HDLC_POS 15
#endif
#ifndef ERF_TYPE_DSM_COLOR_ETH
#define ERF_TYPE_DSM_COLOR_ETH 16
#endif
#ifndef ERF_TYPE_COLOR_MC_HDLC_POS
#define ERF_TYPE_COLOR_MC_HDLC_POS 17
#endif
#ifndef ERF_TYPE_AAL2
#define ERF_TYPE_AAL2 18
#endif
#ifndef ERF_TYPE_COLOR_HASH_POS
#define ERF_TYPE_COLOR_HASH_POS 19
#endif
#ifndef ERF_TYPE_COLOR_HASH_ETH
#define ERF_TYPE_COLOR_HASH_ETH 20
#endif
#ifndef ERF_TYPE_INFINIBAND
#define ERF_TYPE_INFINIBAND 21
#endif
#ifndef ERF_TYPE_IPV4
#define ERF_TYPE_IPV4 22
#endif
#ifndef ERF_TYPE_IPV6
#define ERF_TYPE_IPV6 23
#endif
#ifndef ERF_TYPE_RAW_LINK
#define ERF_TYPE_RAW_LINK 24
#endif
#ifndef ERF_TYPE_INFINIBAND_LINK
#define ERF_TYPE_INFINIBAND_LINK 25
#endif
#ifndef ERF_TYPE_META
#define ERF_TYPE_META 27
#endif
#ifndef ERF_TYPE_PAD
#define ERF_TYPE_PAD 48
#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;
u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */
u_char *dag_mem_top; /* DAG card current memory top pointer */
int dag_fcs_bits; /* Number of checksum bits from link layer */
int dag_flags; /* Flags */
int dag_stream; /* DAG stream number */
int dag_timeout; /* timeout specified to pcap_open_live.
* Same as in linux above, introduce
* generally? */
dag_card_ref_t dag_ref; /* DAG Configuration/Status API card reference */
dag_component_t dag_root; /* DAG CSAPI Root component */
attr_uuid_t drop_attr; /* DAG Stream Drop Attribute handle, if available */
struct timeval required_select_timeout;
/* Timeout caller must use in event loops */
};
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];
#ifndef HAVE_DAG_LARGE_STREAMS_API
#define dag_attach_stream64(a, b, c, d) dag_attach_stream(a, b, c, d)
#define dag_get_stream_poll64(a, b, c, d, e) dag_get_stream_poll(a, b, c, d, e)
#define dag_set_stream_poll64(a, b, c, d, e) dag_set_stream_poll(a, b, c, d, e)
#define dag_size_t uint32_t
#endif
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);
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 = p->priv;
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));
if(pd->dag_ref != NULL) {
dag_config_dispose(pd->dag_ref);
p->fd = -1;
pd->dag_ref = NULL;
}
delete_pcap_dag(p);
pcap_cleanup_live_common(p);
/* Note: don't need to call close(p->fd) or dag_close(p->fd) as dag_config_dispose(pd->dag_ref) does this. */
}
static void
atexit_handler(void)
{
while (pcap_dags != NULL) {
if (pcap_dags->pid == getpid()) {
if (pcap_dags->p != NULL)
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;
unsigned int nonblocking = pd->dag_flags & DAGF_NONBLOCK;
unsigned int num_ext_hdr = 0;
unsigned int ticks_per_second;
/* 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;
}
/* 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;
}
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;
dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom);
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 ERF_TYPE_COLOR_HDLC_POS:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_DSM_COLOR_HDLC_POS:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_MC_HDLC_POS:
case ERF_TYPE_COLOR_HASH_ETH:
case ERF_TYPE_COLOR_HASH_POS:
break;
default:
if ( (pd->drop_attr == kNullAttributeUuid) && (header->lctr) ) {
pd->stat.ps_drop += ntohs(header->lctr);
}
}
if ((header->type & 0x7f) == ERF_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 ERF_TYPE_MC_AAL5:
case ERF_TYPE_MC_ATM:
case ERF_TYPE_MC_HDLC:
case ERF_TYPE_MC_RAW_CHANNEL:
case ERF_TYPE_MC_RAW:
case ERF_TYPE_MC_AAL2:
case ERF_TYPE_COLOR_MC_HDLC_POS:
packet_len += 4; /* MC header */
break;
case ERF_TYPE_COLOR_HASH_ETH:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_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 ERF_TYPE_ATM:
case ERF_TYPE_AAL5:
if ((header->type & 0x7f) == ERF_TYPE_AAL5) {
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size;
}
case ERF_TYPE_MC_ATM:
if ((header->type & 0x7f) == ERF_TYPE_MC_ATM) {
caplen = packet_len = ATM_CELL_SIZE;
dp+=4;
}
case ERF_TYPE_MC_AAL5:
if ((header->type & 0x7f) == ERF_TYPE_MC_AAL5) {
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size - 4;
dp+=4;
}
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
if ((header->type & 0x7f) == ERF_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 if (p->linktype == DLT_ATM_RFC1483) {
packet_len -= ATM_HDR_SIZE;
caplen -= ATM_HDR_SIZE;
dp += ATM_HDR_SIZE;
} else
continue;
break;
case ERF_TYPE_COLOR_HASH_ETH:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_ETH:
if ((p->linktype != DLT_EN10MB) &&
(p->linktype != DLT_DOCSIS))
continue;
packet_len = ntohs(header->wlen);
packet_len -= (pd->dag_fcs_bits >> 3);
caplen = rlen - dag_record_size - 2;
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
if (caplen > packet_len) {
caplen = packet_len;
}
dp += 2;
break;
case ERF_TYPE_COLOR_HASH_POS:
case ERF_TYPE_DSM_COLOR_HDLC_POS:
case ERF_TYPE_COLOR_HDLC_POS:
case ERF_TYPE_HDLC_POS:
if ((p->linktype != DLT_CHDLC) &&
(p->linktype != DLT_PPP_SERIAL) &&
(p->linktype != DLT_FRELAY))
continue;
packet_len = ntohs(header->wlen);
packet_len -= (pd->dag_fcs_bits >> 3);
caplen = rlen - dag_record_size;
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
if (caplen > packet_len) {
caplen = packet_len;
}
break;
case ERF_TYPE_COLOR_MC_HDLC_POS:
case ERF_TYPE_MC_HDLC:
if ((p->linktype != DLT_CHDLC) &&
(p->linktype != DLT_PPP_SERIAL) &&
(p->linktype != DLT_FRELAY) &&
(p->linktype != DLT_MTP2) &&
(p->linktype != DLT_MTP2_WITH_PHDR) &&
(p->linktype != DLT_LAPD))
continue;
packet_len = ntohs(header->wlen);
packet_len -= (pd->dag_fcs_bits >> 3);
caplen = rlen - dag_record_size - 4;
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
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 ERF_TYPE_IPV4:
if ((p->linktype != DLT_RAW) &&
(p->linktype != DLT_IPV4))
continue;
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size;
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
if (caplen > packet_len) {
caplen = packet_len;
}
break;
case ERF_TYPE_IPV6:
if ((p->linktype != DLT_RAW) &&
(p->linktype != DLT_IPV6))
continue;
packet_len = ntohs(header->wlen);
caplen = rlen - dag_record_size;
/* Skip over extension headers */
caplen -= (8 * num_ext_hdr);
if (caplen > packet_len) {
caplen = packet_len;
}
break;
/* These types have no matching 'native' DLT, but can be used with DLT_ERF above */
case ERF_TYPE_MC_RAW:
case ERF_TYPE_MC_RAW_CHANNEL:
case ERF_TYPE_IP_COUNTER:
case ERF_TYPE_TCP_FLOW_COUNTER:
case ERF_TYPE_INFINIBAND:
case ERF_TYPE_RAW_LINK:
case ERF_TYPE_INFINIBAND_LINK:
default:
/* Unhandled ERF type.
* Ignore rather than generating error
*/
continue;
} /* switch type */
} /* 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;
}
switch (p->opt.tstamp_precision) {
case PCAP_TSTAMP_PRECISION_NANO:
ticks_per_second = 1000000000;
break;
case PCAP_TSTAMP_PRECISION_MICRO:
default:
ticks_per_second = 1000000;
break;
}
pcap_header.ts.tv_sec = ts >> 32;
ts = (ts & 0xffffffffULL) * ticks_per_second;
ts += 0x80000000; /* rounding */
pcap_header.ts.tv_usec = ts >> 32;
if (pcap_header.ts.tv_usec >= ticks_per_second) {
pcap_header.ts.tv_usec -= ticks_per_second;
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* p)
{
struct pcap_dag *pd = p->priv;
char *s;
int n;
daginf_t* daginf;
char * newDev = NULL;
char * device = p->opt.device;
dag_size_t mindata;
struct timeval maxwait;
struct timeval poll;
if (device == NULL) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "device is NULL");
return -1;
}
/* Initialize some components of the pcap structure. */
newDev = (char *)malloc(strlen(device) + 16);
if (newDev == NULL) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "Can't allocate string for device name");
goto fail;
}
/* Parse input name to get dag device and stream number if provided */
if (dag_parse_name(device, newDev, strlen(device) + 16, &pd->dag_stream) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_parse_name");
goto fail;
}
device = newDev;
if (pd->dag_stream%2) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture");
goto fail;
}
/* setup device parameters */
if((pd->dag_ref = dag_config_init((char *)device)) == NULL) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_config_init %s", device);
goto fail;
}
if((p->fd = dag_config_get_card_fd(pd->dag_ref)) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_config_get_card_fd %s", device);
goto fail;
}
/* Open requested stream. Can fail if already locked or on error */
if (dag_attach_stream64(p->fd, pd->dag_stream, 0, 0) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_attach_stream");
goto failclose;
}
/* Try to find Stream Drop attribute */
pd->drop_attr = kNullAttributeUuid;
pd->dag_root = dag_config_get_root_component(pd->dag_ref);
if ( dag_component_get_subcomponent(pd->dag_root, kComponentStreamFeatures, 0) )
{
pd->drop_attr = dag_config_get_indexed_attribute_uuid(pd->dag_ref, kUint32AttributeStreamDropCount, pd->dag_stream/2);
}
/* Set up default poll parameters for stream
* Can be overridden by pcap_set_nonblock()
*/
if (dag_get_stream_poll64(p->fd, pd->dag_stream,
&mindata, &maxwait, &poll) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_get_stream_poll");
goto faildetach;
}
/* Use the poll time as the required select timeout for callers
* who are using select()/etc. in an event loop waiting for
* packets to arrive.
*/
pd->required_select_timeout = poll;
p->required_select_timeout = &pd->required_select_timeout;
/*
* Turn a negative snapshot value (invalid), a snapshot value of
* 0 (unspecified), or a value bigger than the normal maximum
* value, into the maximum allowed value.
*
* If some application really *needs* a bigger snapshot
* length, we should just increase MAXIMUM_SNAPLEN.
*/
if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN)
p->snapshot = MAXIMUM_SNAPLEN;
if (p->opt.immediate) {
/* Call callback immediately.
* XXX - is this the right way to p 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 = p->opt.timeout/1000;
maxwait.tv_usec = (p->opt.timeout%1000) * 1000;
if (dag_set_stream_poll64(p->fd, pd->dag_stream,
mindata, &maxwait, &poll) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_set_stream_poll");
goto faildetach;
}
/* 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 (p->snapshot == 0 || p->snapshot > MAX_DAG_SNAPLEN) {
p->snapshot = MAX_DAG_SNAPLEN;
} else if (snaplen < MIN_DAG_SNAPLEN) {
p->snapshot = MIN_DAG_SNAPLEN;
}
/* snap len has to be a multiple of 4 */
#endif
if(dag_start_stream(p->fd, pd->dag_stream) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_start_stream %s", device);
goto faildetach;
}
/*
* 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!
*/
pd->dag_mem_bottom = 0;
pd->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(p->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. */
pd->dag_fcs_bits = 0;
/* Note that no FCS will be supplied. */
p->linktype_ext = LT_FCS_DATALINK_EXT(0);
} else {
/*
* Start out assuming it's 32 bits.
*/
pd->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) {
pd->dag_fcs_bits = n;
} else {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment", 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. */
p->linktype_ext = LT_FCS_DATALINK_EXT(pd->dag_fcs_bits/16);
/* And don't strip them. */
pd->dag_fcs_bits = 0;
}
}
pd->dag_timeout = p->opt.timeout;
p->linktype = -1;
if (dag_get_datalink(p) < 0)
goto failstop;
p->bufsize = 0;
if (new_pcap_dag(p) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "new_pcap_dag %s", device);
goto failstop;
}
/*
* "select()" and "poll()" don't work on DAG device descriptors.
*/
p->selectable_fd = -1;
if (newDev != NULL) {
free((char *)newDev);
}
p->read_op = dag_read;
p->inject_op = dag_inject;
p->setfilter_op = dag_setfilter;
p->setdirection_op = NULL; /* Not implemented.*/
p->set_datalink_op = dag_set_datalink;
p->getnonblock_op = pcap_getnonblock_fd;
p->setnonblock_op = dag_setnonblock;
p->stats_op = dag_stats;
p->cleanup_op = dag_platform_cleanup;
pd->stat.ps_drop = 0;
pd->stat.ps_recv = 0;
pd->stat.ps_ifdrop = 0;
return 0;
failstop:
if (dag_stop_stream(p->fd, pd->dag_stream) < 0) {
fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno));
}
faildetach:
if (dag_detach_stream(p->fd, pd->dag_stream) < 0)
fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno));
failclose:
dag_config_dispose(pd->dag_ref);
delete_pcap_dag(p);
fail:
pcap_cleanup_live_common(p);
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;
long stream = 0;
/* 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);
if (*cpend == ':') {
/* Followed by a stream number. */
stream = strtol(++cpend, &cpend, 10);
}
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;
}
if (stream <0 || stream >= DAG_STREAM_MAX) {
/* Followed by a non-valid stream number. */
*is_ours = 0;
return NULL;
}
/* OK, it's probably ours. */
*is_ours = 1;
p = pcap_create_common(ebuf, sizeof (struct pcap_dag));
if (p == NULL)
return NULL;
p->activate_op = dag_activate;
/*
* We claim that we support microsecond and nanosecond time
* stamps.
*
* XXX Our native precision is 2^-32s, but libpcap doesn't support
* power of two precisions yet. We can convert to either MICRO or NANO.
*/
p->tstamp_precision_count = 2;
p->tstamp_precision_list = malloc(2 * sizeof(u_int));
if (p->tstamp_precision_list == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
pcap_close(p);
return NULL;
}
p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO;
p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO;
return p;
}
static int
dag_stats(pcap_t *p, struct pcap_stat *ps) {
struct pcap_dag *pd = p->priv;
uint32_t stream_drop;
dag_err_t dag_error;
/*
* Packet records received (ps_recv) are counted in dag_read().
* Packet records dropped (ps_drop) are read from Stream Drop attribute if present,
* otherwise integrate the ERF Header lctr counts (if available) in dag_read().
* We are reporting that no records are dropped by the card/driver (ps_ifdrop).
*/
if(pd->drop_attr != kNullAttributeUuid) {
/* Note this counter is cleared at start of capture and will wrap at UINT_MAX.
* The application is responsible for polling ps_drop frequently enough
* to detect each wrap and integrate total drop with a wider counter */
if ((dag_error = dag_config_get_uint32_attribute_ex(pd->dag_ref, pd->drop_attr, &stream_drop) == kDagErrNone)) {
pd->stat.ps_drop = stream_drop;
} else {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "reading stream drop attribute: %s",
dag_config_strerror(dag_error));
return -1;
}
}
*ps = pd->stat;
return 0;
}
/*
* Add all DAG devices.
*/
int
dag_findalldevs(pcap_if_list_t *devlistp, char *errbuf)
{
char name[12]; /* XXX - pick a size */
int c;
char dagname[DAGNAME_BUFSIZE];
int dagstream;
int dagfd;
dag_card_inf_t *inf;
char *description;
int stream, rxstreams;
/* Try all the DAGs 0-DAG_MAX_BOARDS */
for (c = 0; c < DAG_MAX_BOARDS; c++) {
pcap_snprintf(name, 12, "dag%d", c);
if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream))
{
(void) pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"dag: device name %s can't be parsed", name);
return (-1);
}
if ( (dagfd = dag_open(dagname)) >= 0 ) {
description = NULL;
if ((inf = dag_pciinfo(dagfd)))
description = dag_device_name(inf->device_code, 1);
/*
* XXX - is there a way to determine whether
* the card is plugged into a network or not?
* If so, we should check that and set
* PCAP_IF_CONNECTION_STATUS_CONNECTED or
* PCAP_IF_CONNECTION_STATUS_DISCONNECTED.
*
* Also, are there notions of "up" and "running"?
*/
if (add_dev(devlistp, name, 0, description, errbuf) == NULL) {
/*
* Failure.
*/
return (-1);
}
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);
pcap_snprintf(name, 10, "dag%d:%d", c, stream);
if (add_dev(devlistp, name, 0, description, errbuf) == NULL) {
/*
* Failure.
*/
return (-1);
}
rxstreams--;
if(rxstreams <= 0) {
break;
}
}
}
dag_close(dagfd);
}
}
return (0);
}
/*
* 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)
{
struct pcap_dag *pd = p->priv;
dag_size_t mindata;
struct timeval maxwait;
struct timeval poll;
/*
* 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_flags".
*/
if (pcap_setnonblock_fd(p, nonblock) < 0)
return (-1);
if (dag_get_stream_poll64(p->fd, pd->dag_stream,
&mindata, &maxwait, &poll) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_get_stream_poll");
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_poll64(p->fd, pd->dag_stream,
mindata, &maxwait, &poll) < 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "dag_set_stream_poll");
return -1;
}
if (nonblock) {
pd->dag_flags |= DAGF_NONBLOCK;
} else {
pd->dag_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) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "malloc");
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) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "dag_get_stream_erf_types");
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) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "dag_get_erf_types");
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 ERF_TYPE_HDLC_POS:
case ERF_TYPE_COLOR_HDLC_POS:
case ERF_TYPE_DSM_COLOR_HDLC_POS:
case ERF_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 ERF_TYPE_ETH:
case ERF_TYPE_COLOR_ETH:
case ERF_TYPE_DSM_COLOR_ETH:
case ERF_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 ERF_TYPE_ATM:
case ERF_TYPE_AAL5:
case ERF_TYPE_MC_ATM:
case ERF_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 ERF_TYPE_COLOR_MC_HDLC_POS:
case ERF_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 ERF_TYPE_IPV4:
if (p->dlt_list != NULL) {
p->dlt_list[dlt_index++] = DLT_RAW;
p->dlt_list[dlt_index++] = DLT_IPV4;
}
if(!p->linktype)
p->linktype = DLT_RAW;
break;
case ERF_TYPE_IPV6:
if (p->dlt_list != NULL) {
p->dlt_list[dlt_index++] = DLT_RAW;
p->dlt_list[dlt_index++] = DLT_IPV6;
}
if(!p->linktype)
p->linktype = DLT_RAW;
break;
case ERF_TYPE_LEGACY:
case ERF_TYPE_MC_RAW:
case ERF_TYPE_MC_RAW_CHANNEL:
case ERF_TYPE_IP_COUNTER:
case ERF_TYPE_TCP_FLOW_COUNTER:
case ERF_TYPE_INFINIBAND:
case ERF_TYPE_RAW_LINK:
case ERF_TYPE_INFINIBAND_LINK:
case ERF_TYPE_META:
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;
}
#ifdef DAG_ONLY
/*
* This libpcap build supports only DAG cards, not regular network
* interfaces.
*/
/*
* There are no regular interfaces, just DAG interfaces.
*/
int
pcap_platform_finddevs(pcap_if_list_t *devlistp _U_, char *errbuf)
{
return (0);
}
/*
* Attempts to open a regular interface fail.
*/
pcap_t *
pcap_create_interface(const char *device, char *errbuf)
{
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"This version of libpcap only supports DAG cards");
return NULL;
}
/*
* Libpcap version string.
*/
const char *
pcap_lib_version(void)
{
return (PCAP_VERSION_STRING " (DAG-only)");
}
#endif