2 * Copyright (c) 2006 Paolo Abeni (Italy)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote
15 * products derived from this software without specific prior written
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * USB sniffing API implementation for Linux platform
31 * By Paolo Abeni <paolo.abeni@email.it>
32 * Modifications: Kris Katterjohn <katterjohn@gmail.com>
36 static const char rcsid[] _U_ =
37 "@(#) $Header: /tcpdump/master/libpcap/pcap-usb-linux.c,v 1.33 2008-12-23 21:38:50 guy Exp $ (LBL)";
45 #include "pcap-usb-linux.h"
48 #ifdef NEED_STRERROR_H
60 #include <netinet/in.h>
61 #include <sys/ioctl.h>
63 #ifdef HAVE_LINUX_USBDEVICE_FS_H
64 #include <linux/usbdevice_fs.h>
67 #define USB_IFACE "usbmon"
68 #define USB_TEXT_DIR_OLD "/sys/kernel/debug/usbmon"
69 #define USB_TEXT_DIR "/sys/kernel/debug/usb/usbmon"
70 #define SYS_USB_BUS_DIR "/sys/bus/usb/devices"
71 #define PROC_USB_BUS_DIR "/proc/bus/usb"
72 #define USB_LINE_LEN 4096
74 #if __BYTE_ORDER == __LITTLE_ENDIAN
79 #define htols(s) bswap_16(s)
80 #define htoll(l) bswap_32(l)
81 #define htol64(ll) bswap_64(ll)
84 struct mon_bin_stats {
92 size_t data_len; /* Length of data (can be zero) */
95 struct mon_bin_mfetch {
96 int32_t *offvec; /* Vector of events fetched */
97 int32_t nfetch; /* Number of events to fetch (out: fetched) */
98 int32_t nflush; /* Number of events to flush */
101 #define MON_IOC_MAGIC 0x92
103 #define MON_IOCQ_URB_LEN _IO(MON_IOC_MAGIC, 1)
104 #define MON_IOCX_URB _IOWR(MON_IOC_MAGIC, 2, struct mon_bin_hdr)
105 #define MON_IOCG_STATS _IOR(MON_IOC_MAGIC, 3, struct mon_bin_stats)
106 #define MON_IOCT_RING_SIZE _IO(MON_IOC_MAGIC, 4)
107 #define MON_IOCQ_RING_SIZE _IO(MON_IOC_MAGIC, 5)
108 #define MON_IOCX_GET _IOW(MON_IOC_MAGIC, 6, struct mon_bin_get)
109 #define MON_IOCX_MFETCH _IOWR(MON_IOC_MAGIC, 7, struct mon_bin_mfetch)
110 #define MON_IOCH_MFLUSH _IO(MON_IOC_MAGIC, 8)
112 #define MON_BIN_SETUP 0x1 /* setup hdr is present*/
113 #define MON_BIN_SETUP_ZERO 0x2 /* setup buffer is not available */
114 #define MON_BIN_DATA_ZERO 0x4 /* data buffer is not available */
115 #define MON_BIN_ERROR 0x8
117 /* forward declaration */
118 static int usb_activate(pcap_t *);
119 static int usb_stats_linux(pcap_t *, struct pcap_stat *);
120 static int usb_stats_linux_bin(pcap_t *, struct pcap_stat *);
121 static int usb_read_linux(pcap_t *, int , pcap_handler , u_char *);
122 static int usb_read_linux_bin(pcap_t *, int , pcap_handler , u_char *);
123 static int usb_read_linux_mmap(pcap_t *, int , pcap_handler , u_char *);
124 static int usb_inject_linux(pcap_t *, const void *, size_t);
125 static int usb_setfilter_linux(pcap_t *, struct bpf_program *);
126 static int usb_setdirection_linux(pcap_t *, pcap_direction_t);
127 static void usb_cleanup_linux_mmap(pcap_t *);
129 /* facility to add an USB device to the device list*/
131 usb_dev_add(pcap_if_t** alldevsp, int n, char *err_str)
135 snprintf(dev_name, 10, USB_IFACE"%d", n);
136 snprintf(dev_descr, 30, "USB bus number %d", n);
138 if (pcap_add_if(alldevsp, dev_name, 0,
139 dev_descr, err_str) < 0)
145 usb_platform_finddevs(pcap_if_t **alldevsp, char *err_str)
154 /* try scanning sysfs usb bus directory */
155 dir = opendir(SYS_USB_BUS_DIR);
157 while ((ret == 0) && ((data = readdir(dir)) != 0)) {
160 if (strncmp(name, "usb", 3) != 0)
163 if (sscanf(&name[3], "%d", &n) == 0)
166 ret = usb_dev_add(alldevsp, n, err_str);
173 /* that didn't work; try scanning procfs usb bus directory */
174 dir = opendir(PROC_USB_BUS_DIR);
176 while ((ret == 0) && ((data = readdir(dir)) != 0)) {
180 /* if this file name does not end with a number it's not of our interest */
181 if ((len < 1) || !isdigit(name[--len]))
183 while (isdigit(name[--len]));
184 if (sscanf(&name[len+1], "%d", &n) != 1)
187 ret = usb_dev_add(alldevsp, n, err_str);
194 /* neither of them worked */
199 int usb_mmap(pcap_t* handle)
201 int len = ioctl(handle->fd, MON_IOCQ_RING_SIZE);
205 handle->md.mmapbuflen = len;
206 handle->md.mmapbuf = mmap(0, handle->md.mmapbuflen, PROT_READ,
207 MAP_SHARED, handle->fd, 0);
208 return handle->md.mmapbuf != MAP_FAILED;
211 #define CTRL_TIMEOUT (5*1000) /* milliseconds */
213 #define USB_DIR_IN 0x80
214 #define USB_TYPE_STANDARD 0x00
215 #define USB_RECIP_DEVICE 0x00
217 #define USB_REQ_GET_DESCRIPTOR 6
219 #define USB_DT_DEVICE 1
221 /* probe the descriptors of the devices attached to the bus */
222 /* the descriptors will end up in the captured packet stream */
223 /* and be decoded by external apps like wireshark */
224 /* without these identifying probes packet data can't be fully decoded */
226 probe_devices(int bus)
228 struct usbdevfs_ctrltransfer ctrl;
234 /* scan usb bus directories for device nodes */
235 snprintf(buf, sizeof(buf), "/dev/bus/usb/%03d", bus);
240 while ((ret >= 0) && ((data = readdir(dir)) != 0)) {
242 char* name = data->d_name;
247 snprintf(buf, sizeof(buf), "/dev/bus/usb/%03d/%s", bus, data->d_name);
249 fd = open(buf, O_RDWR);
254 * Sigh. Different kernels have different member names
255 * for this structure.
257 #ifdef HAVE_USBDEVFS_CTRLTRANSFER_BREQUESTTYPE
258 ctrl.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
259 ctrl.bRequest = USB_REQ_GET_DESCRIPTOR;
260 ctrl.wValue = USB_DT_DEVICE << 8;
262 ctrl.wLength = sizeof(buf);
264 ctrl.requesttype = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
265 ctrl.request = USB_REQ_GET_DESCRIPTOR;
266 ctrl.value = USB_DT_DEVICE << 8;
268 ctrl.length = sizeof(buf);
271 ctrl.timeout = CTRL_TIMEOUT;
273 ret = ioctl(fd, USBDEVFS_CONTROL, &ctrl);
281 usb_create(const char *device, char *ebuf)
285 p = pcap_create_common(device, ebuf);
289 p->activate_op = usb_activate;
294 usb_activate(pcap_t* handle)
296 char full_path[USB_LINE_LEN];
298 /* Initialize some components of the pcap structure. */
299 handle->bufsize = handle->snapshot;
301 handle->linktype = DLT_USB_LINUX;
303 handle->inject_op = usb_inject_linux;
304 handle->setfilter_op = usb_setfilter_linux;
305 handle->setdirection_op = usb_setdirection_linux;
306 handle->set_datalink_op = NULL; /* can't change data link type */
307 handle->getnonblock_op = pcap_getnonblock_fd;
308 handle->setnonblock_op = pcap_setnonblock_fd;
310 /*get usb bus index from device name */
311 if (sscanf(handle->opt.source, USB_IFACE"%d", &handle->md.ifindex) != 1)
313 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
314 "Can't get USB bus index from %s", handle->opt.source);
318 /*now select the read method: try to open binary interface */
319 snprintf(full_path, USB_LINE_LEN, LINUX_USB_MON_DEV"%d", handle->md.ifindex);
320 handle->fd = open(full_path, O_RDONLY, 0);
323 if (handle->opt.rfmon) {
325 * Monitor mode doesn't apply to USB devices.
328 return PCAP_ERROR_RFMON_NOTSUP;
331 /* binary api is available, try to use fast mmap access */
332 if (usb_mmap(handle)) {
333 handle->linktype = DLT_USB_LINUX_MMAPPED;
334 handle->stats_op = usb_stats_linux_bin;
335 handle->read_op = usb_read_linux_mmap;
336 handle->cleanup_op = usb_cleanup_linux_mmap;
337 probe_devices(handle->md.ifindex);
340 * "handle->fd" is a real file, so "select()" and
341 * "poll()" work on it.
343 handle->selectable_fd = handle->fd;
347 /* can't mmap, use plain binary interface access */
348 handle->stats_op = usb_stats_linux_bin;
349 handle->read_op = usb_read_linux_bin;
350 probe_devices(handle->md.ifindex);
353 /*Binary interface not available, try open text interface */
354 snprintf(full_path, USB_LINE_LEN, USB_TEXT_DIR"/%dt", handle->md.ifindex);
355 handle->fd = open(full_path, O_RDONLY, 0);
361 * Not found at the new location; try
364 snprintf(full_path, USB_LINE_LEN, USB_TEXT_DIR_OLD"/%dt", handle->md.ifindex);
365 handle->fd = open(full_path, O_RDONLY, 0);
367 if (handle->fd < 0) {
368 /* no more fallback, give it up*/
369 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
370 "Can't open USB bus file %s: %s", full_path, strerror(errno));
375 if (handle->opt.rfmon) {
377 * Monitor mode doesn't apply to USB devices.
380 return PCAP_ERROR_RFMON_NOTSUP;
383 handle->stats_op = usb_stats_linux;
384 handle->read_op = usb_read_linux;
388 * "handle->fd" is a real file, so "select()" and "poll()"
391 handle->selectable_fd = handle->fd;
393 /* for plain binary access and text access we need to allocate the read
395 handle->buffer = malloc(handle->bufsize);
396 if (!handle->buffer) {
397 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
398 "malloc: %s", pcap_strerror(errno));
408 return c < 'A' ? c- '0': ((c<'a') ? c - 'A' + 10: c-'a'+10);
412 * see <linux-kernel-source>/Documentation/usb/usbmon.txt and
413 * <linux-kernel-source>/drivers/usb/mon/mon_text.c for urb string
417 usb_read_linux(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
420 * /usr/src/linux/Documentation/usb/usbmon.txt
424 int tag, cnt, ep_num, dev_addr, dummy, ret, urb_len, data_len;
425 char etype, pipeid1, pipeid2, status[16], urb_tag, line[USB_LINE_LEN];
427 u_char * rawdata = handle->buffer;
428 struct pcap_pkthdr pkth;
429 pcap_usb_header* uhdr = (pcap_usb_header*)handle->buffer;
430 u_char urb_transfer=0;
433 /* ignore interrupt system call errors */
435 ret = read(handle->fd, line, USB_LINE_LEN - 1);
436 if (handle->break_loop)
438 handle->break_loop = 0;
441 } while ((ret == -1) && (errno == EINTR));
445 return 0; /* no data there */
447 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
448 "Can't read from fd %d: %s", handle->fd, strerror(errno));
452 /* read urb header; %n argument may increment return value, but it's
453 * not mandatory, so does not count on it*/
455 ret = sscanf(string, "%x %d %c %c%c:%d:%d %s%n", &tag, ×tamp, &etype,
456 &pipeid1, &pipeid2, &dev_addr, &ep_num, status,
460 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
461 "Can't parse USB bus message '%s', too few tokens (expected 8 got %d)",
466 uhdr->device_address = dev_addr;
467 uhdr->bus_id = handle->md.ifindex;
471 /* don't use usbmon provided timestamp, since it have low precision*/
472 if (gettimeofday(&pkth.ts, NULL) < 0)
474 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
475 "Can't get timestamp for message '%s' %d:%s",
476 string, errno, strerror(errno));
479 uhdr->ts_sec = pkth.ts.tv_sec;
480 uhdr->ts_usec = pkth.ts.tv_usec;
482 /* parse endpoint information */
484 urb_transfer = URB_CONTROL;
485 else if (pipeid1 == 'Z')
486 urb_transfer = URB_ISOCHRONOUS;
487 else if (pipeid1 == 'I')
488 urb_transfer = URB_INTERRUPT;
489 else if (pipeid1 == 'B')
490 urb_transfer = URB_BULK;
491 if (pipeid2 == 'i') {
492 ep_num |= URB_TRANSFER_IN;
496 incoming = !incoming;
501 if (handle->direction == PCAP_D_OUT)
505 if (handle->direction == PCAP_D_IN)
507 uhdr->event_type = etype;
508 uhdr->transfer_type = urb_transfer;
509 uhdr->endpoint_number = ep_num;
510 pkth.caplen = sizeof(pcap_usb_header);
511 rawdata += sizeof(pcap_usb_header);
513 /* check if this is a setup packet */
514 ret = sscanf(status, "%d", &dummy);
517 /* this a setup packet, setup data can be filled with underscore if
518 * usbmon has not been able to read them, so we must parse this fields as
520 pcap_usb_setup* shdr;
521 char str1[3], str2[3], str3[5], str4[5], str5[5];
522 ret = sscanf(string, "%s %s %s %s %s%n", str1, str2, str3, str4,
526 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
527 "Can't parse USB bus message '%s', too few tokens (expected 5 got %d)",
533 /* try to convert to corresponding integer */
535 shdr->bmRequestType = strtoul(str1, 0, 16);
536 shdr->bRequest = strtoul(str2, 0, 16);
537 shdr->wValue = htols(strtoul(str3, 0, 16));
538 shdr->wIndex = htols(strtoul(str4, 0, 16));
539 shdr->wLength = htols(strtoul(str5, 0, 16));
541 uhdr->setup_flag = 0;
544 uhdr->setup_flag = 1;
547 ret = sscanf(string, " %d%n", &urb_len, &cnt);
550 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
551 "Can't parse urb length from '%s'", string);
556 /* urb tag is not present if urb length is 0, so we can stop here
558 pkth.len = urb_len+pkth.caplen;
559 uhdr->urb_len = urb_len;
562 if (uhdr->urb_len == 0)
565 /* check for data presence; data is present if and only if urb tag is '=' */
566 if (sscanf(string, " %c", &urb_tag) != 1)
568 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
569 "Can't parse urb tag from '%s'", string);
576 /* skip urb tag and following space */
579 /* if we reach this point we got some urb data*/
582 /* read all urb data; if urb length is greater then the usbmon internal
583 * buffer length used by the kernel to spool the URB, we get only
584 * a partial information.
585 * At least until linux 2.6.17 there is no way to set usbmon intenal buffer
586 * length and default value is 130. */
587 while ((string[0] != 0) && (string[1] != 0) && (pkth.caplen < handle->snapshot))
589 rawdata[0] = ascii_to_int(string[0]) * 16 + ascii_to_int(string[1]);
592 if (string[0] == ' ')
599 uhdr->data_len = data_len;
600 handle->md.packets_read++;
601 if (pkth.caplen > handle->snapshot)
602 pkth.caplen = handle->snapshot;
604 callback(user, &pkth, handle->buffer);
609 usb_inject_linux(pcap_t *handle, const void *buf, size_t size)
611 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "inject not supported on "
617 usb_stats_linux(pcap_t *handle, struct pcap_stat *stats)
619 int dummy, ret, consumed, cnt;
620 char string[USB_LINE_LEN];
621 char token[USB_LINE_LEN];
625 snprintf(string, USB_LINE_LEN, USB_TEXT_DIR"/%ds", handle->md.ifindex);
626 fd = open(string, O_RDONLY, 0);
632 * Not found at the new location; try the old
635 snprintf(string, USB_LINE_LEN, USB_TEXT_DIR_OLD"/%ds", handle->md.ifindex);
636 fd = open(string, O_RDONLY, 0);
639 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
640 "Can't open USB stats file %s: %s",
641 string, strerror(errno));
646 /* read stats line */
648 ret = read(fd, string, USB_LINE_LEN-1);
649 } while ((ret == -1) && (errno == EINTR));
654 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
655 "Can't read stats from fd %d ", fd);
660 /* extract info on dropped urbs */
661 for (consumed=0; consumed < ret; ) {
662 /* from the sscanf man page:
663 * The C standard says: "Execution of a %n directive does
664 * not increment the assignment count returned at the completion
665 * of execution" but the Corrigendum seems to contradict this.
666 * Do not make any assumptions on the effect of %n conversions
667 * on the return value and explicitly check for cnt assignmet*/
671 ntok = sscanf(ptr, "%s%n", token, &cnt);
672 if ((ntok < 1) || (cnt < 0))
676 if (strcmp(token, "nreaders") == 0)
677 ret = sscanf(ptr, "%d", &stats->ps_drop);
679 ret = sscanf(ptr, "%d", &dummy);
686 stats->ps_recv = handle->md.packets_read;
687 stats->ps_ifdrop = 0;
692 usb_setfilter_linux(pcap_t *p, struct bpf_program *fp)
698 usb_setdirection_linux(pcap_t *p, pcap_direction_t d)
706 usb_stats_linux_bin(pcap_t *handle, struct pcap_stat *stats)
709 struct mon_bin_stats st;
710 ret = ioctl(handle->fd, MON_IOCG_STATS, &st);
713 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
714 "Can't read stats from fd %d:%s ", handle->fd, strerror(errno));
718 stats->ps_recv = handle->md.packets_read + st.queued;
719 stats->ps_drop = st.dropped;
720 stats->ps_ifdrop = 0;
725 * see <linux-kernel-source>/Documentation/usb/usbmon.txt and
726 * <linux-kernel-source>/drivers/usb/mon/mon_bin.c binary ABI
729 usb_read_linux_bin(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
731 struct mon_bin_get info;
733 struct pcap_pkthdr pkth;
734 int clen = handle->snapshot - sizeof(pcap_usb_header);
736 /* the usb header is going to be part of 'packet' data*/
737 info.hdr = (pcap_usb_header*) handle->buffer;
738 info.data = handle->buffer + sizeof(pcap_usb_header);
739 info.data_len = clen;
741 /* ignore interrupt system call errors */
743 ret = ioctl(handle->fd, MON_IOCX_GET, &info);
744 if (handle->break_loop)
746 handle->break_loop = 0;
749 } while ((ret == -1) && (errno == EINTR));
753 return 0; /* no data there */
755 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
756 "Can't read from fd %d: %s", handle->fd, strerror(errno));
760 /* we can get less that than really captured from kernel, depending on
761 * snaplen, so adjust header accordingly */
762 if (info.hdr->data_len < clen)
763 clen = info.hdr->data_len;
764 info.hdr->data_len = clen;
765 pkth.caplen = clen + sizeof(pcap_usb_header);
766 pkth.len = info.hdr->data_len + sizeof(pcap_usb_header);
767 pkth.ts.tv_sec = info.hdr->ts_sec;
768 pkth.ts.tv_usec = info.hdr->ts_usec;
770 handle->md.packets_read++;
771 callback(user, &pkth, handle->buffer);
776 * see <linux-kernel-source>/Documentation/usb/usbmon.txt and
777 * <linux-kernel-source>/drivers/usb/mon/mon_bin.c binary ABI
781 usb_read_linux_mmap(pcap_t *handle, int max_packets, pcap_handler callback, u_char *user)
783 struct mon_bin_mfetch fetch;
784 int32_t vec[VEC_SIZE];
785 struct pcap_pkthdr pkth;
786 pcap_usb_header* hdr;
791 max_clen = handle->snapshot - sizeof(pcap_usb_header);
795 int limit = max_packets - packets;
798 if (limit > VEC_SIZE)
801 /* try to fetch as many events as possible*/
803 fetch.nfetch = limit;
804 fetch.nflush = nflush;
805 /* ignore interrupt system call errors */
807 ret = ioctl(handle->fd, MON_IOCX_MFETCH, &fetch);
808 if (handle->break_loop)
810 handle->break_loop = 0;
813 } while ((ret == -1) && (errno == EINTR));
817 return 0; /* no data there */
819 snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
820 "Can't mfetch fd %d: %s", handle->fd, strerror(errno));
824 /* keep track of processed events, we will flush them later */
825 nflush = fetch.nfetch;
826 for (i=0; i<fetch.nfetch; ++i) {
828 hdr = (pcap_usb_header*) &handle->md.mmapbuf[vec[i]];
829 if (hdr->event_type == '@')
832 /* we can get less that than really captured from kernel, depending on
833 * snaplen, so adjust header accordingly */
835 if (hdr->data_len < clen)
836 clen = hdr->data_len;
838 /* get packet info from header*/
839 pkth.caplen = clen + sizeof(pcap_usb_header_mmapped);
840 pkth.len = hdr->data_len + sizeof(pcap_usb_header_mmapped);
841 pkth.ts.tv_sec = hdr->ts_sec;
842 pkth.ts.tv_usec = hdr->ts_usec;
844 handle->md.packets_read++;
845 callback(user, &pkth, (u_char*) hdr);
849 /* with max_packets <= 0 we stop afer the first chunk*/
850 if ((max_packets <= 0) || (packets == max_packets))
854 /* flush pending events*/
855 ioctl(handle->fd, MON_IOCH_MFLUSH, nflush);
860 usb_cleanup_linux_mmap(pcap_t* handle)
862 /* if we have a memory-mapped buffer, unmap it */
863 if (handle->md.mmapbuf != NULL) {
864 munmap(handle->md.mmapbuf, handle->md.mmapbuflen);
865 handle->md.mmapbuf = NULL;
867 pcap_cleanup_live_common(handle);