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Add Myricom SNF API support as a new pcap device.

This patch adds support for our NICs when run in a specialized capture mode.
It is diffed against the current master.

The Myricom Sniffer10G software uses Myri-10G programmable Network Interface
Cards (NICs), a firmware extension, a specialized driver and a user-level
library (libsnf) to enable sustained capture of 10-Gigabit Ethernet traffic.
Small-packet coalescing and an efficient zero-copy path to host memory allow
Sniffer10G to capture streams at line rate for all Ethernet packet sizes.

Optionally, libpcap can be used concurrently by multiple processes on a single
NIC port to partition the incoming traffic across processes.  While the Linux
kernel enables this through multiple receive queues, the difference is that the
myri_snf driver cooperates with libsnf to set up multiple queues that are each
independently accessible through user-space.

More information here: http://www.myri.com/scs/SNF/doc

Signed-off-by: Guy Harris <guy@alum.mit.edu>
master
Christian Bell 13 years ago committed by Guy Harris
parent ecd955e0df
commit e1539bdbcb
  1. 3
      config.h.in
  2. 209
      configure
  3. 113
      configure.in
  4. 3
      inet.c
  5. 12
      pcap-bpf.c
  6. 11
      pcap-int.h
  7. 16
      pcap-linux.c
  8. 306
      pcap-snf.c
  9. 2
      pcap-snf.h

@ -91,6 +91,9 @@
/* define if you have a Septel API */
#undef HAVE_SEPTEL_API
/* define if you have Myricom SNF API */
#undef HAVE_SNF_API
/* Define to 1 if you have the `snprintf' function. */
#undef HAVE_SNPRINTF

209
configure vendored

@ -1313,6 +1313,11 @@ Optional Packages:
Endace DAG library directory
--with-septel[=DIR] include Septel support (located in directory DIR, if
supplied). [default=yes, on Linux, if present]
--with-snf[=DIR] include Myricom SNF support ["yes", "no" or DIR;
default="yes" on BSD and Linux if present]
--with-snf-includes=DIR Myricom SNF include directory
--with-snf-libraries=DIR
Myricom SNF library directory
--without-flex don't use flex
--without-bison don't use bison
@ -7800,6 +7805,10 @@ septel)
V_DEFS="$V_DEFS -DSEPTEL_ONLY"
;;
snf)
V_DEFS="$V_DEFS -DSNF_ONLY"
;;
null)
{ echo "$as_me:$LINENO: WARNING: cannot determine packet capture interface" >&5
echo "$as_me: WARNING: cannot determine packet capture interface" >&2;}
@ -9095,6 +9104,206 @@ echo "$as_me: error: Specifying the capture type as 'septel' requires the Septel
{ (exit 1); exit 1; }; }
fi
# Check for Myricom SNF support.
# Check whether --with-snf was given.
if test "${with_snf+set}" = set; then
withval=$with_snf;
if test "$withval" = no
then
# User explicitly doesn't want SNF
want_snf=no
elif test "$withval" = yes
then
# User wants SNF support but hasn't specific a directory.
want_snf=yes
else
# User wants SNF support with a specified directory.
want_snf=yes
snf_root=$withval
fi
else
#
# Use Sniffer API if present, otherwise don't
#
want_snf=ifpresent
fi
# Check whether --with-snf-includes was given.
if test "${with_snf_includes+set}" = set; then
withval=$with_snf_includes;
# User wants SNF with specific header directory
want_snf=yes
snf_include_dir=$withval
fi
# Check whether --with-snf-libraries was given.
if test "${with_snf_libraries+set}" = set; then
withval=$with_snf_libraries;
# User wants SNF with specific lib directory
want_snf=yes
snf_lib_dir=$withval
fi
case "$V_PCAP" in
bpf|linux|snf)
#
# We support the Sniffer API if we're on BSD, Linux, or if we're
# building a Sniffer-only libpcap.
#
;;
*)
#
# If the user explicitly requested Sniffer, tell them it's not
# supported.
#
# If they expressed no preference, don't include it.
#
if test $want_snf = yes; then
{ { echo "$as_me:$LINENO: error: Myricom SNF support only available with 'bpf' 'linux' and 'snf' packet capture types" >&5
echo "$as_me: error: Myricom SNF support only available with 'bpf' 'linux' and 'snf' packet capture types" >&2;}
{ (exit 1); exit 1; }; }
elif test $want_snf = yes; then
want_snf=no
fi
;;
esac
ac_cv_lbl_snf_api=no
if test "$with_snf" != no; then
{ echo "$as_me:$LINENO: checking whether we have Myricom Sniffer API" >&5
echo $ECHO_N "checking whether we have Myricom Sniffer API... $ECHO_C" >&6; }
if test -z "$snf_root"; then
snf_root=/opt/snf
fi
if test -z "$snf_include_dir"; then
snf_include_dir="$snf_root/include"
fi
if test -z "$snf_lib_dir"; then
snf_lib_dir="$snf_root/lib"
fi
if test -f "$snf_include_dir/snf.h"; then
ac_cv_lbl_snf_api=yes
fi
{ echo "$as_me:$LINENO: result: $ac_cv_lbl_snf_api ($snf_root)" >&5
echo "${ECHO_T}$ac_cv_lbl_snf_api ($snf_root)" >&6; }
if test $ac_cv_lbl_snf_api = no; then
if test "$want_snf" = yes; then
{ { echo "$as_me:$LINENO: error: SNF API headers not found under $snf_include_dir; use --without-snf" >&5
echo "$as_me: error: SNF API headers not found under $snf_include_dir; use --without-snf" >&2;}
{ (exit 1); exit 1; }; }
fi
else
saved_ldflags=$LDFLAGS
LDFLAGS="$LDFLAGS -L$snf_lib_dir"
{ echo "$as_me:$LINENO: checking for snf_init in -lsnf" >&5
echo $ECHO_N "checking for snf_init in -lsnf... $ECHO_C" >&6; }
if test "${ac_cv_lib_snf_snf_init+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lsnf $LIBS"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
/* Override any GCC internal prototype to avoid an error.
Use char because int might match the return type of a GCC
builtin and then its argument prototype would still apply. */
#ifdef __cplusplus
extern "C"
#endif
char snf_init ();
int
main ()
{
return snf_init ();
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
(eval "$ac_link") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
ac_cv_lib_snf_snf_init=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_cv_lib_snf_snf_init=no
fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
{ echo "$as_me:$LINENO: result: $ac_cv_lib_snf_snf_init" >&5
echo "${ECHO_T}$ac_cv_lib_snf_snf_init" >&6; }
if test $ac_cv_lib_snf_snf_init = yes; then
ac_cv_lbl_snf_api="yes"
else
ac_cv_lbl_snf_api="no"
fi
LDFLAGS="$saved_ldflags"
if test $ac_cv_lbl_snf_api = no; then
if test "$want_snf" = yes; then
{ { echo "$as_me:$LINENO: error: SNF API cannot correctly be linked check config.log; use --without-snf" >&5
echo "$as_me: error: SNF API cannot correctly be linked check config.log; use --without-snf" >&2;}
{ (exit 1); exit 1; }; }
fi
else
V_INCLS="$V_INCLS -I$snf_include_dir"
LIBS="$LIBS -L$snf_lib_dir -lsnf"
cat >>confdefs.h <<\_ACEOF
#define HAVE_SNF_API 1
_ACEOF
fi
fi
fi
if test "$V_PCAP" = snf -a "$ac_cv_lbl_snf_api" = no; then
{ { echo "$as_me:$LINENO: error: Specifying the capture type as 'snf' requires the Myricom Sniffer API to be present; use --with-snf=DIR" >&5
echo "$as_me: error: Specifying the capture type as 'snf' requires the Myricom Sniffer API to be present; use --with-snf=DIR" >&2;}
{ (exit 1); exit 1; }; }
fi
# Check whether --with-flex was given.

@ -500,6 +500,10 @@ septel)
V_DEFS="$V_DEFS -DSEPTEL_ONLY"
;;
snf)
V_DEFS="$V_DEFS -DSNF_ONLY"
;;
null)
AC_MSG_WARN(cannot determine packet capture interface)
AC_MSG_WARN((see the INSTALL doc for more info))
@ -978,6 +982,115 @@ if test "$V_PCAP" = septel -a "$ac_cv_lbl_septel_api" = no; then
AC_MSG_ERROR(Specifying the capture type as 'septel' requires the Septel API to be present; use --with-septel=DIR)
fi
# Check for Myricom SNF support.
AC_ARG_WITH([snf],
AC_HELP_STRING([--with-snf@<:@=DIR@:>@],[include Myricom SNF support @<:@"yes", "no" or DIR; default="yes" on BSD and Linux if present@:>@]),
[
if test "$withval" = no
then
# User explicitly doesn't want SNF
want_snf=no
elif test "$withval" = yes
then
# User wants SNF support but hasn't specific a directory.
want_snf=yes
else
# User wants SNF support with a specified directory.
want_snf=yes
snf_root=$withval
fi
],[
#
# Use Sniffer API if present, otherwise don't
#
want_snf=ifpresent
])
AC_ARG_WITH([snf-includes],
AC_HELP_STRING([--with-snf-includes=DIR],[Myricom SNF include directory]),
[
# User wants SNF with specific header directory
want_snf=yes
snf_include_dir=$withval
],[])
AC_ARG_WITH([snf-libraries],
AC_HELP_STRING([--with-snf-libraries=DIR],[Myricom SNF library directory]),
[
# User wants SNF with specific lib directory
want_snf=yes
snf_lib_dir=$withval
],[])
case "$V_PCAP" in
bpf|linux|snf)
#
# We support the Sniffer API if we're on BSD, Linux, or if we're
# building a Sniffer-only libpcap.
#
;;
*)
#
# If the user explicitly requested Sniffer, tell them it's not
# supported.
#
# If they expressed no preference, don't include it.
#
if test $want_snf = yes; then
AC_MSG_ERROR(Myricom SNF support only available with 'bpf' 'linux' and 'snf' packet capture types)
elif test $want_snf = yes; then
want_snf=no
fi
;;
esac
ac_cv_lbl_snf_api=no
if test "$with_snf" != no; then
AC_MSG_CHECKING(whether we have Myricom Sniffer API)
if test -z "$snf_root"; then
snf_root=/opt/snf
fi
if test -z "$snf_include_dir"; then
snf_include_dir="$snf_root/include"
fi
if test -z "$snf_lib_dir"; then
snf_lib_dir="$snf_root/lib"
fi
if test -f "$snf_include_dir/snf.h"; then
ac_cv_lbl_snf_api=yes
fi
AC_MSG_RESULT([$ac_cv_lbl_snf_api ($snf_root)])
if test $ac_cv_lbl_snf_api = no; then
if test "$want_snf" = yes; then
AC_MSG_ERROR(SNF API headers not found under $snf_include_dir; use --without-snf)
fi
else
saved_ldflags=$LDFLAGS
LDFLAGS="$LDFLAGS -L$snf_lib_dir"
AC_CHECK_LIB([snf], [snf_init], [ac_cv_lbl_snf_api="yes"], [ac_cv_lbl_snf_api="no"])
LDFLAGS="$saved_ldflags"
if test $ac_cv_lbl_snf_api = no; then
if test "$want_snf" = yes; then
AC_MSG_ERROR(SNF API cannot correctly be linked check config.log; use --without-snf)
fi
else
V_INCLS="$V_INCLS -I$snf_include_dir"
LIBS="$LIBS -L$snf_lib_dir -lsnf"
AC_DEFINE(HAVE_SNF_API, 1, [define if you have Myricom SNF API])
fi
fi
fi
if test "$V_PCAP" = snf -a "$ac_cv_lbl_snf_api" = no; then
AC_MSG_ERROR(Specifying the capture type as 'snf' requires the Myricom Sniffer API to be present; use --with-snf=DIR)
fi
AC_LBL_LEX_AND_YACC(V_LEX, V_YACC, pcap_)
if test "$V_LEX" = lex ; then

@ -670,6 +670,9 @@ pcap_lookupnet(device, netp, maskp, errbuf)
#endif
#ifdef PCAP_SUPPORT_USB
|| strstr(device, "usbmon") != NULL
#endif
#ifdef HAVE_SNF_API
|| strstr(device, "snf") != NULL
#endif
) {
*netp = *maskp = 0;

@ -126,6 +126,10 @@ static int bpf_load(char *errbuf);
#include "pcap-dag.h"
#endif /* HAVE_DAG_API */
#ifdef HAVE_SNF_API
#include "pcap-snf.h"
#endif /* HAVE_SNF_API */
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
@ -417,6 +421,10 @@ pcap_create(const char *device, char *ebuf)
if (strstr(device, "dag"))
return (dag_create(device, ebuf));
#endif /* HAVE_DAG_API */
#ifdef HAVE_SNF_API
if (strstr(device, "snf"))
return (snf_create(device, ebuf));
#endif /* HAVE_SNF_API */
p = pcap_create_common(device, ebuf);
if (p == NULL)
@ -2170,6 +2178,10 @@ pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
if (dag_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif /* HAVE_DAG_API */
#ifdef HAVE_SNF_API
if (snf_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif /* HAVE_SNF_API */
return (0);
}

@ -56,6 +56,10 @@ extern CRITICAL_SECTION g_PcapCompileCriticalSection;
#include <io.h>
#endif
#ifdef HAVE_SNF_API
#include <snf.h>
#endif
#if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/
/*
@ -162,6 +166,13 @@ struct pcap_md {
* Same as in linux above, introduce
* generally? */
#endif /* HAVE_DAG_API */
#ifdef HAVE_SNF_API
snf_handle_t snf_handle; /* opaque device handle */
snf_ring_t snf_ring; /* opaque device ring handle */
int snf_timeout;
int snf_boardnum;
#endif /*HAVE_SNF_API*/
#ifdef HAVE_ZEROCOPY_BPF
/*
* Zero-copy read buffer -- for zero-copy BPF. 'buffer' above will

@ -170,6 +170,10 @@ static const char rcsid[] _U_ =
#include "pcap-septel.h"
#endif /* HAVE_SEPTEL_API */
#ifdef HAVE_SNF_API
#include "pcap-snf.h"
#endif /* HAVE_SNF_API */
#ifdef PCAP_SUPPORT_USB
#include "pcap-usb-linux.h"
#endif
@ -376,6 +380,13 @@ pcap_create(const char *device, char *ebuf)
}
#endif /* HAVE_SEPTEL_API */
#ifdef HAVE_SNF_API
handle = snf_create(device, ebuf);
if (strstr(device, "snf") || handle != NULL)
return handle;
#endif /* HAVE_SNF_API */
#ifdef PCAP_SUPPORT_BT
if (strstr(device, "bluetooth")) {
return bt_create(device, ebuf);
@ -2100,6 +2111,11 @@ pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
return (-1);
#endif /* HAVE_SEPTEL_API */
#ifdef HAVE_SNF_API
if (snf_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif /* HAVE_SNF_API */
#ifdef PCAP_SUPPORT_BT
/*
* Add Bluetooth devices.

@ -0,0 +1,306 @@
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <netinet/in.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "snf.h"
#include "pcap-int.h"
#ifdef SNF_ONLY
#define snf_create pcap_create
#define snf_platform_finddevs pcap_platform_finddevs
#endif
static int
snf_set_datalink(pcap_t *p, int dlt)
{
p->linktype = dlt;
return (0);
}
static int
snf_pcap_stats(pcap_t *p, struct pcap_stat *ps)
{
struct snf_ring_stats stats;
int rc;
if ((rc = snf_ring_getstats(p->md.snf_ring, &stats))) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_get_stats: %s",
pcap_strerror(rc));
return -1;
}
ps->ps_recv = stats.ring_pkt_recv + stats.ring_pkt_overflow;
ps->ps_drop = stats.ring_pkt_overflow;
ps->ps_ifdrop = stats.nic_pkt_overflow + stats.nic_pkt_bad;
return 0;
}
static void
snf_platform_cleanup(pcap_t *p)
{
if (p == NULL)
return;
snf_ring_close(p->md.snf_ring);
snf_close(p->md.snf_handle);
pcap_cleanup_live_common(p);
}
static int
snf_getnonblock(pcap_t *p, char *errbuf)
{
return (p->md.snf_timeout == 0);
}
static int
snf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
{
if (nonblock)
p->md.snf_timeout = 0;
else {
if (p->md.timeout <= 0)
p->md.snf_timeout = -1; /* forever */
else
p->md.snf_timeout = p->md.timeout;
}
return (0);
}
#define _NSEC_PER_SEC 1000000000
static inline
struct timeval
snf_timestamp_to_timeval(const int64_t ts_nanosec)
{
struct timeval tv;
int32_t rem;
if (ts_nanosec == 0)
return (struct timeval) { 0, 0 };
tv.tv_sec = ts_nanosec / _NSEC_PER_SEC;
tv.tv_usec = (ts_nanosec % _NSEC_PER_SEC) / 1000;
return tv;
}
static int
snf_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
struct pcap_pkthdr hdr;
int i, flags, err, caplen, n;
struct snf_recv_req req;
if (!p || cnt == 0)
return -1;
n = 0;
while (n < cnt || cnt < 0) {
/*
* Has "pcap_breakloop()" been called?
*/
if (p->break_loop) {
if (n == 0) {
p->break_loop = 0;
return (-2);
} else {
return (n);
}
}
err = snf_ring_recv(p->md.snf_ring, p->md.snf_timeout, &req);
if (err) {
if (err == EBUSY || err == EAGAIN)
return (0);
if (err == EINTR)
continue;
if (err != 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "snf_read: %s",
pcap_strerror(err));
return -1;
}
}
caplen = req.length;
if (caplen > p->snapshot)
caplen = p->snapshot;
if ((p->fcode.bf_insns == NULL) ||
bpf_filter(p->fcode.bf_insns, req.pkt_addr, req.length, caplen)) {
hdr.ts = snf_timestamp_to_timeval(req.timestamp);
hdr.caplen = caplen;
hdr.len = req.length;
callback(user, &hdr, req.pkt_addr);
}
n++;
}
return (n);
}
static int
snf_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;
p->md.use_bpf = 0;
return (0);
}
static int
snf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
{
strlcpy(p->errbuf, "Sending packets isn't supported with snf",
PCAP_ERRBUF_SIZE);
return (-1);
}
static int
snf_activate(pcap_t* p)
{
char *device = p->opt.source;
const char *nr = NULL;
int err;
int flags = 0;
if (device == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"device is NULL: %s", pcap_strerror(errno));
return -1;
}
/* In Libpcap, we set pshared by default if NUM_RINGS is set to > 1.
* Since libpcap isn't thread-safe */
if ((nr = getenv("SNF_NUM_RINGS")) && *nr && atoi(nr) > 1)
flags |= SNF_F_PSHARED;
else
nr = NULL;
err = snf_open(p->md.snf_boardnum,
0, /* let SNF API parse SNF_NUM_RINGS, if set */
NULL, /* default RSS, or use SNF_RSS_FLAGS env */
0, /* default to SNF_DATARING_SIZE from env */
flags, /* may want pshared */
&p->md.snf_handle);
if (err != 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"snf_open failed: %s", pcap_strerror(err));
return -1;
}
err = snf_ring_open(p->md.snf_handle, &p->md.snf_ring);
if (err != 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"snf_ring_open failed: %s", pcap_strerror(err));
return -1;
}
if (p->md.timeout <= 0)
p->md.snf_timeout = -1;
else
p->md.snf_timeout = p->md.timeout;
err = snf_start(p->md.snf_handle);
if (err != 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"snf_start failed: %s", pcap_strerror(err));
return -1;
}
/*
* "select()" and "poll()" don't work on snf descriptors.
*/
p->selectable_fd = -1;
p->linktype = DLT_EN10MB;
p->read_op = snf_read;
p->inject_op = snf_inject;
p->setfilter_op = snf_setfilter;
p->setdirection_op = NULL; /* Not implemented.*/
p->set_datalink_op = snf_set_datalink;
p->getnonblock_op = snf_getnonblock;
p->setnonblock_op = snf_setnonblock;
p->stats_op = snf_pcap_stats;
p->cleanup_op = snf_platform_cleanup;
p->md.stat.ps_recv = 0;
p->md.stat.ps_drop = 0;
p->md.stat.ps_ifdrop = 0;
return 0;
}
int
snf_platform_finddevs(pcap_if_t **devlistp, char *errbuf)
{
/*
* There are no platform-specific devices since each device
* exists as a regular Ethernet device.
*/
return 0;
}
pcap_t *
snf_create(const char *device, char *ebuf)
{
pcap_t *p;
int boardnum = -1;
struct snf_ifaddrs *ifaddrs, *ifa;
size_t devlen;
if (snf_init(SNF_VERSION_API))
return NULL;
/*
* Match a given interface name to our list of interface names, from
* which we can obtain the intended board number
*/
if (snf_getifaddrs(&ifaddrs) || ifaddrs == NULL)
return NULL;
devlen = strlen(device) + 1;
ifa = ifaddrs;
while (ifa) {
if (!strncmp(device, ifa->snf_ifa_name, devlen)) {
boardnum = ifa->snf_ifa_boardnum;
break;
}
ifa = ifa->snf_ifa_next;
}
snf_freeifaddrs(ifaddrs);
if (ifa == NULL) {
/*
* If we can't find the device by name, support the name "snfX"
* and "snf10gX" where X is the board number.
*/
if (sscanf(device, "snf10g%d", &boardnum) != 1 &&
sscanf(device, "snf%d", &boardnum) != 1)
return NULL;
}
p = pcap_create_common(device, ebuf);
if (p == NULL)
return NULL;
p->activate_op = snf_activate;
p->md.snf_boardnum = boardnum;
return p;
}

@ -0,0 +1,2 @@
pcap_t *snf_create(const char *, char *);
int snf_platform_finddevs(pcap_if_t **devlistp, char *errbuf);