#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
+#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <limits.h>
+#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <sys/mman.h>
#include <linux/if.h>
+#include <linux/if_packet.h>
#include <netinet/in.h>
#include <linux/if_ether.h>
#include <net/if_arp.h>
#include <poll.h>
-
-/*
- * Got Wireless Extensions?
- */
-#ifdef HAVE_LINUX_WIRELESS_H
-#include <linux/wireless.h>
-#endif /* HAVE_LINUX_WIRELESS_H */
-
-/*
- * Got libnl?
- */
-#ifdef HAVE_LIBNL
-#include <linux/nl80211.h>
-
-#include <netlink/genl/genl.h>
-#include <netlink/genl/family.h>
-#include <netlink/genl/ctrl.h>
-#include <netlink/msg.h>
-#include <netlink/attr.h>
-#endif /* HAVE_LIBNL */
+#include <dirent.h>
#include "pcap-int.h"
#include "pcap/sll.h"
#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
#include "pcap-bt-linux.h"
#endif
+#ifdef PCAP_SUPPORT_CAN
+#include "pcap-can-linux.h"
+#endif
+
+#if PCAP_SUPPORT_CANUSB
+#include "pcap-canusb-linux.h"
+#endif
+
+#ifdef PCAP_SUPPORT_NETFILTER
+#include "pcap-netfilter-linux.h"
+#endif
+
/*
* If PF_PACKET is defined, we can use {SOCK_RAW,SOCK_DGRAM}/PF_PACKET
* sockets rather than SOCK_PACKET sockets.
#include <linux/filter.h>
#endif
+/*
+ * We need linux/sockios.h if we have linux/net_tstamp.h (for time stamp
+ * specification) or linux/ethtool.h (for ethtool ioctls to get offloading
+ * information).
+ */
+#if defined(HAVE_LINUX_NET_TSTAMP_H) || defined(HAVE_LINUX_ETHTOOL_H)
+#include <linux/sockios.h>
+#endif
+
+#ifdef HAVE_LINUX_NET_TSTAMP_H
+#include <linux/net_tstamp.h>
+#endif
+
+/*
+ * Got Wireless Extensions?
+ */
+#ifdef HAVE_LINUX_WIRELESS_H
+#include <linux/wireless.h>
+#endif /* HAVE_LINUX_WIRELESS_H */
+
+/*
+ * Got libnl?
+ */
+#ifdef HAVE_LIBNL
+#include <linux/nl80211.h>
+
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+#include <netlink/genl/ctrl.h>
+#include <netlink/msg.h>
+#include <netlink/attr.h>
+#endif /* HAVE_LIBNL */
+
+/*
+ * Got ethtool support?
+ */
+#ifdef HAVE_LINUX_ETHTOOL_H
+#include <linux/ethtool.h>
+#endif
+
#ifndef HAVE_SOCKLEN_T
typedef int socklen_t;
#endif
/*
* Prototypes for internal functions and methods.
*/
-static void map_arphrd_to_dlt(pcap_t *, int, int);
+static void map_arphrd_to_dlt(pcap_t *, int, int, const char *, int);
#ifdef HAVE_PF_PACKET_SOCKETS
static short int map_packet_type_to_sll_type(short int);
#endif
static int pcap_activate_linux(pcap_t *);
static int activate_old(pcap_t *);
static int activate_new(pcap_t *);
-static int activate_mmap(pcap_t *);
+static int activate_mmap(pcap_t *, int *);
static int pcap_can_set_rfmon_linux(pcap_t *);
static int pcap_read_linux(pcap_t *, int, pcap_handler, u_char *);
static int pcap_read_packet(pcap_t *, pcap_handler, u_char *);
#define RING_GET_FRAME(h) (((union thdr **)h->buffer)[h->offset])
static void destroy_ring(pcap_t *handle);
-static int create_ring(pcap_t *handle);
+static int create_ring(pcap_t *handle, int *status);
static int prepare_tpacket_socket(pcap_t *handle);
static void pcap_cleanup_linux_mmap(pcap_t *);
static int pcap_read_linux_mmap(pcap_t *, int, pcap_handler , u_char *);
*/
#ifdef HAVE_PF_PACKET_SOCKETS
static int iface_get_id(int fd, const char *device, char *ebuf);
-#endif
+#endif /* HAVE_PF_PACKET_SOCKETS */
static int iface_get_mtu(int fd, const char *device, char *ebuf);
static int iface_get_arptype(int fd, const char *device, char *ebuf);
#ifdef HAVE_PF_PACKET_SOCKETS
static int enter_rfmon_mode(pcap_t *handle, int sock_fd,
const char *device);
#endif /* HAVE_PF_PACKET_SOCKETS */
+static int iface_get_offload(pcap_t *handle);
static int iface_bind_old(int fd, const char *device, char *ebuf);
#ifdef SO_ATTACH_FILTER
= BPF_STMT(BPF_RET | BPF_K, 0);
static struct sock_fprog total_fcode
= { 1, &total_insn };
-#endif
+#endif /* SO_ATTACH_FILTER */
pcap_t *
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);
}
#endif
+#if PCAP_SUPPORT_CANUSB
+ if (strstr(device, "canusb")) {
+ return canusb_create(device, ebuf);
+ }
+#endif
+
+#ifdef PCAP_SUPPORT_CAN
+ if ((strncmp(device, "can", 3) == 0 && isdigit(device[3])) ||
+ (strncmp(device, "vcan", 4) == 0 && isdigit(device[4]))) {
+ return can_create(device, ebuf);
+ }
+#endif
+
#ifdef PCAP_SUPPORT_USB
if (strstr(device, "usbmon")) {
return usb_create(device, ebuf);
}
#endif
+#ifdef PCAP_SUPPORT_NETFILTER
+ if (strncmp(device, "nflog", strlen("nflog")) == 0) {
+ return nflog_create(device, ebuf);
+ }
+#endif
+
handle = pcap_create_common(device, ebuf);
if (handle == NULL)
return NULL;
handle->activate_op = pcap_activate_linux;
handle->can_set_rfmon_op = pcap_can_set_rfmon_linux;
+#if defined(HAVE_LINUX_NET_TSTAMP_H) && defined(PACKET_TIMESTAMP)
+ /*
+ * We claim that we support:
+ *
+ * software time stamps, with no details about their precision;
+ * hardware time stamps, synced to the host time;
+ * hardware time stamps, not synced to the host time.
+ *
+ * XXX - we can't ask a device whether it supports
+ * hardware time stamps, so we just claim all devices do.
+ */
+ handle->tstamp_type_count = 3;
+ handle->tstamp_type_list = malloc(3 * sizeof(u_int));
+ if (handle->tstamp_type_list == NULL) {
+ free(handle);
+ return NULL;
+ }
+ handle->tstamp_type_list[0] = PCAP_TSTAMP_HOST;
+ handle->tstamp_type_list[1] = PCAP_TSTAMP_ADAPTER;
+ handle->tstamp_type_list[2] = PCAP_TSTAMP_ADAPTER_UNSYNCED;
+#endif
+
return handle;
}
#ifdef HAVE_LIBNL
/*
- *
- * If interface {if} is a mac80211 driver, the file
- * /sys/class/net/{if}/phy80211 is a symlink to
- * /sys/class/ieee80211/{phydev}, for some {phydev}.
- *
- * On Fedora 9, with a 2.6.26.3-29 kernel, my Zydas stick, at
- * least, has a "wmaster0" device and a "wlan0" device; the
- * latter is the one with the IP address. Both show up in
- * "tcpdump -D" output. Capturing on the wmaster0 device
- * captures with 802.11 headers.
- *
- * airmon-ng searches through /sys/class/net for devices named
- * monN, starting with mon0; as soon as one *doesn't* exist,
- * it chooses that as the monitor device name. If the "iw"
- * command exists, it does "iw dev {if} interface add {monif}
- * type monitor", where {monif} is the monitor device. It
- * then (sigh) sleeps .1 second, and then configures the
- * device up. Otherwise, if /sys/class/ieee80211/{phydev}/add_iface
- * is a file, it writes {mondev}, without a newline, to that file,
- * and again (sigh) sleeps .1 second, and then iwconfig's that
- * device into monitor mode and configures it up. Otherwise,
- * you can't do monitor mode.
- *
- * All these devices are "glued" together by having the
- * /sys/class/net/{device}/phy80211 links pointing to the same
- * place, so, given a wmaster, wlan, or mon device, you can
- * find the other devices by looking for devices with
- * the same phy80211 link.
- *
- * To turn monitor mode off, delete the monitor interface,
- * either with "iw dev {monif} interface del" or by sending
- * {monif}, with no NL, down /sys/class/ieee80211/{phydev}/remove_iface
- *
- * Note: if you try to create a monitor device named "monN", and
- * there's already a "monN" device, it fails, as least with
- * the netlink interface (which is what iw uses), with a return
- * value of -ENFILE. (Return values are negative errnos.) We
- * could probably use that to find an unused device.
- *
- * Yes, you can have multiple monitor devices for a given
- * physical device.
+ * If interface {if} is a mac80211 driver, the file
+ * /sys/class/net/{if}/phy80211 is a symlink to
+ * /sys/class/ieee80211/{phydev}, for some {phydev}.
+ *
+ * On Fedora 9, with a 2.6.26.3-29 kernel, my Zydas stick, at
+ * least, has a "wmaster0" device and a "wlan0" device; the
+ * latter is the one with the IP address. Both show up in
+ * "tcpdump -D" output. Capturing on the wmaster0 device
+ * captures with 802.11 headers.
+ *
+ * airmon-ng searches through /sys/class/net for devices named
+ * monN, starting with mon0; as soon as one *doesn't* exist,
+ * it chooses that as the monitor device name. If the "iw"
+ * command exists, it does "iw dev {if} interface add {monif}
+ * type monitor", where {monif} is the monitor device. It
+ * then (sigh) sleeps .1 second, and then configures the
+ * device up. Otherwise, if /sys/class/ieee80211/{phydev}/add_iface
+ * is a file, it writes {mondev}, without a newline, to that file,
+ * and again (sigh) sleeps .1 second, and then iwconfig's that
+ * device into monitor mode and configures it up. Otherwise,
+ * you can't do monitor mode.
+ *
+ * All these devices are "glued" together by having the
+ * /sys/class/net/{device}/phy80211 links pointing to the same
+ * place, so, given a wmaster, wlan, or mon device, you can
+ * find the other devices by looking for devices with
+ * the same phy80211 link.
+ *
+ * To turn monitor mode off, delete the monitor interface,
+ * either with "iw dev {monif} interface del" or by sending
+ * {monif}, with no NL, down /sys/class/ieee80211/{phydev}/remove_iface
+ *
+ * Note: if you try to create a monitor device named "monN", and
+ * there's already a "monN" device, it fails, as least with
+ * the netlink interface (which is what iw uses), with a return
+ * value of -ENFILE. (Return values are negative errnos.) We
+ * could probably use that to find an unused device.
+ *
+ * Yes, you can have multiple monitor devices for a given
+ * physical device.
*/
/*
return 1;
}
+#ifdef HAVE_LIBNL_2_x
+#define get_nl_errmsg nl_geterror
+#else
+/* libnl 2.x compatibility code */
+
+#define nl_sock nl_handle
+
+static inline struct nl_handle *
+nl_socket_alloc(void)
+{
+ return nl_handle_alloc();
+}
+
+static inline void
+nl_socket_free(struct nl_handle *h)
+{
+ nl_handle_destroy(h);
+}
+
+#define get_nl_errmsg strerror
+
+static inline int
+__genl_ctrl_alloc_cache(struct nl_handle *h, struct nl_cache **cache)
+{
+ struct nl_cache *tmp = genl_ctrl_alloc_cache(h);
+ if (!tmp)
+ return -ENOMEM;
+ *cache = tmp;
+ return 0;
+}
+#define genl_ctrl_alloc_cache __genl_ctrl_alloc_cache
+#endif /* !HAVE_LIBNL_2_x */
+
struct nl80211_state {
- struct nl_handle *nl_handle;
+ struct nl_sock *nl_sock;
struct nl_cache *nl_cache;
struct genl_family *nl80211;
};
static int
nl80211_init(pcap_t *handle, struct nl80211_state *state, const char *device)
{
- state->nl_handle = nl_handle_alloc();
- if (!state->nl_handle) {
+ int err;
+
+ state->nl_sock = nl_socket_alloc();
+ if (!state->nl_sock) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"%s: failed to allocate netlink handle", device);
return PCAP_ERROR;
}
- if (genl_connect(state->nl_handle)) {
+ if (genl_connect(state->nl_sock)) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"%s: failed to connect to generic netlink", device);
goto out_handle_destroy;
}
- state->nl_cache = genl_ctrl_alloc_cache(state->nl_handle);
- if (!state->nl_cache) {
+ err = genl_ctrl_alloc_cache(state->nl_sock, &state->nl_cache);
+ if (err < 0) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "%s: failed to allocate generic netlink cache", device);
+ "%s: failed to allocate generic netlink cache: %s",
+ device, get_nl_errmsg(-err));
goto out_handle_destroy;
}
out_cache_free:
nl_cache_free(state->nl_cache);
out_handle_destroy:
- nl_handle_destroy(state->nl_handle);
+ nl_socket_free(state->nl_sock);
return PCAP_ERROR;
}
{
genl_family_put(state->nl80211);
nl_cache_free(state->nl_cache);
- nl_handle_destroy(state->nl_handle);
+ nl_socket_free(state->nl_sock);
}
static int
NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, mondevice);
NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
- err = nl_send_auto_complete(state->nl_handle, msg);
+ err = nl_send_auto_complete(state->nl_sock, msg);
if (err < 0) {
+#ifdef HAVE_LIBNL_2_x
+ if (err == -NLE_FAILURE) {
+#else
if (err == -ENFILE) {
+#endif
/*
* Device not available; our caller should just
- * keep trying.
+ * keep trying. (libnl 2.x maps ENFILE to
+ * NLE_FAILURE; it can also map other errors
+ * to that, but there's not much we can do
+ * about that.)
*/
nlmsg_free(msg);
return 0;
*/
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"%s: nl_send_auto_complete failed adding %s interface: %s",
- device, mondevice, strerror(-err));
+ device, mondevice, get_nl_errmsg(-err));
nlmsg_free(msg);
return PCAP_ERROR;
}
}
- err = nl_wait_for_ack(state->nl_handle);
+ err = nl_wait_for_ack(state->nl_sock);
if (err < 0) {
+#ifdef HAVE_LIBNL_2_x
+ if (err == -NLE_FAILURE) {
+#else
if (err == -ENFILE) {
+#endif
/*
* Device not available; our caller should just
- * keep trying.
+ * keep trying. (libnl 2.x maps ENFILE to
+ * NLE_FAILURE; it can also map other errors
+ * to that, but there's not much we can do
+ * about that.)
*/
nlmsg_free(msg);
return 0;
*/
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"%s: nl_wait_for_ack failed adding %s interface: %s",
- device, mondevice, strerror(-err));
+ device, mondevice, get_nl_errmsg(-err));
nlmsg_free(msg);
return PCAP_ERROR;
}
0, NL80211_CMD_DEL_INTERFACE, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
- err = nl_send_auto_complete(state->nl_handle, msg);
+ err = nl_send_auto_complete(state->nl_sock, msg);
if (err < 0) {
- if (err == -ENFILE) {
- /*
- * Device not available; our caller should just
- * keep trying.
- */
- nlmsg_free(msg);
- return 0;
- } else {
- /*
- * Real failure, not just "that device is not
- * available.
- */
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "%s: nl_send_auto_complete failed deleting %s interface: %s",
- device, mondevice, strerror(-err));
- nlmsg_free(msg);
- return PCAP_ERROR;
- }
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: nl_send_auto_complete failed deleting %s interface: %s",
+ device, mondevice, get_nl_errmsg(-err));
+ nlmsg_free(msg);
+ return PCAP_ERROR;
}
- err = nl_wait_for_ack(state->nl_handle);
+ err = nl_wait_for_ack(state->nl_sock);
if (err < 0) {
- if (err == -ENFILE) {
- /*
- * Device not available; our caller should just
- * keep trying.
- */
- nlmsg_free(msg);
- return 0;
- } else {
- /*
- * Real failure, not just "that device is not
- * available.
- */
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "%s: nl_wait_for_ack failed adding %s interface: %s",
- device, mondevice, strerror(-err));
- nlmsg_free(msg);
- return PCAP_ERROR;
- }
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: nl_wait_for_ack failed adding %s interface: %s",
+ device, mondevice, get_nl_errmsg(-err));
+ nlmsg_free(msg);
+ return PCAP_ERROR;
}
/*
nanosleep(&delay, NULL);
#endif
+ /*
+ * If we haven't already done so, arrange to have
+ * "pcap_close_all()" called when we exit.
+ */
+ if (!pcap_do_addexit(handle)) {
+ /*
+ * "atexit()" failed; don't put the interface
+ * in rfmon mode, just give up.
+ */
+ return PCAP_ERROR_RFMON_NOTSUP;
+ }
+
/*
* Now configure the monitor interface up.
*/
return 0;
}
-/* grabs the number of dropped packets by the interface from /proc/net/dev */
+/*
+ * Grabs the number of dropped packets by the interface from /proc/net/dev.
+ *
+ * XXX - what about /sys/class/net/{interface name}/rx_*? There are
+ * individual devices giving, in ASCII, various rx_ and tx_ statistics.
+ *
+ * Or can we get them in binary form from netlink?
+ */
static long int
linux_if_drops(const char * if_name)
{
int ret;
#endif /* HAVE_LIBNL */
#ifdef IW_MODE_MONITOR
+ int oldflags;
struct iwreq ireq;
#endif /* IW_MODE_MONITOR */
sizeof(ifr.ifr_name));
if (ioctl(handle->fd, SIOCGIFFLAGS, &ifr) == -1) {
fprintf(stderr,
- "Can't restore interface flags (SIOCGIFFLAGS failed: %s).\n"
+ "Can't restore interface %s flags (SIOCGIFFLAGS failed: %s).\n"
"Please adjust manually.\n"
"Hint: This can't happen with Linux >= 2.2.0.\n",
- strerror(errno));
+ handle->md.device, strerror(errno));
} else {
if (ifr.ifr_flags & IFF_PROMISC) {
/*
if (ioctl(handle->fd, SIOCSIFFLAGS,
&ifr) == -1) {
fprintf(stderr,
- "Can't restore interface flags (SIOCSIFFLAGS failed: %s).\n"
+ "Can't restore interface %s flags (SIOCSIFFLAGS failed: %s).\n"
"Please adjust manually.\n"
"Hint: This can't happen with Linux >= 2.2.0.\n",
+ handle->md.device,
strerror(errno));
}
}
* mode, this code cannot know that, so it'll take
* it out of rfmon mode.
*/
+
+ /*
+ * First, take the interface down if it's up;
+ * otherwise, we might get EBUSY.
+ * If we get errors, just drive on and print
+ * a warning if we can't restore the mode.
+ */
+ oldflags = 0;
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, handle->md.device,
+ sizeof(ifr.ifr_name));
+ if (ioctl(handle->fd, SIOCGIFFLAGS, &ifr) != -1) {
+ if (ifr.ifr_flags & IFF_UP) {
+ oldflags = ifr.ifr_flags;
+ ifr.ifr_flags &= ~IFF_UP;
+ if (ioctl(handle->fd, SIOCSIFFLAGS, &ifr) == -1)
+ oldflags = 0; /* didn't set, don't restore */
+ }
+ }
+
+ /*
+ * Now restore the mode.
+ */
strncpy(ireq.ifr_ifrn.ifrn_name, handle->md.device,
sizeof ireq.ifr_ifrn.ifrn_name);
ireq.ifr_ifrn.ifrn_name[sizeof ireq.ifr_ifrn.ifrn_name - 1]
* Scientist, you've failed.
*/
fprintf(stderr,
- "Can't restore interface wireless mode (SIOCSIWMODE failed: %s).\n"
+ "Can't restore interface %s wireless mode (SIOCSIWMODE failed: %s).\n"
"Please adjust manually.\n",
- strerror(errno));
+ handle->md.device, strerror(errno));
+ }
+
+ /*
+ * Now bring the interface back up if we brought
+ * it down.
+ */
+ if (oldflags != 0) {
+ ifr.ifr_flags = oldflags;
+ if (ioctl(handle->fd, SIOCSIFFLAGS, &ifr) == -1) {
+ fprintf(stderr,
+ "Can't bring interface %s back up (SIOCSIFFLAGS failed: %s).\n"
+ "Please adjust manually.\n",
+ handle->md.device, strerror(errno));
+ }
}
}
#endif /* IW_MODE_MONITOR */
* to be compatible with older kernels for a while so we are
* trying both methods with the newer method preferred.
*/
-
- if ((status = activate_new(handle)) == 1) {
+ status = activate_new(handle);
+ if (status < 0) {
+ /*
+ * Fatal error with the new way; just fail.
+ * status has the error return; if it's PCAP_ERROR,
+ * handle->errbuf has been set appropriately.
+ */
+ goto fail;
+ }
+ if (status == 1) {
/*
* Success.
* Try to use memory-mapped access.
*/
- switch (activate_mmap(handle)) {
+ switch (activate_mmap(handle, &status)) {
case 1:
- /* we succeeded; nothing more to do */
- return 0;
+ /*
+ * We succeeded. status has been
+ * set to the status to return,
+ * which might be 0, or might be
+ * a PCAP_WARNING_ value.
+ */
+ return status;
case 0:
/*
* Kernel doesn't support it - just continue
* with non-memory-mapped access.
*/
- status = 0;
break;
case -1:
/*
- * We failed to set up to use it, or kernel
- * supports it, but we failed to enable it;
- * return an error. handle->errbuf contains
- * an error message.
+ * We failed to set up to use it, or the kernel
+ * supports it, but we failed to enable it.
+ * status has been set to the error status to
+ * return and, if it's PCAP_ERROR, handle->errbuf
+ * contains the error message.
*/
- status = PCAP_ERROR;
goto fail;
}
}
*/
goto fail;
}
- } else {
- /*
- * Fatal error with the new way; just fail.
- * status has the error return; if it's PCAP_ERROR,
- * handle->errbuf has been set appropriately.
- */
- goto fail;
}
/*
* We set up the socket, but not with memory-mapped access.
*/
+ status = 0;
if (handle->opt.buffer_size != 0) {
/*
* Set the socket buffer size to the specified value.
*/
if (handle->break_loop) {
/*
- * Yes - clear the flag that indicates that it
- * has, and return -2 as an indication that we
- * were told to break out of the loop.
+ * Yes - clear the flag that indicates that it has,
+ * and return PCAP_ERROR_BREAK as an indication that
+ * we were told to break out of the loop.
*/
handle->break_loop = 0;
- return -2;
+ return PCAP_ERROR_BREAK;
}
#if defined(HAVE_PACKET_AUXDATA) && defined(HAVE_LINUX_TPACKET_AUXDATA_TP_VLAN_TCI)
handle->bufsize - offset, MSG_TRUNC,
(struct sockaddr *) &from, &fromlen);
#endif /* defined(HAVE_PACKET_AUXDATA) && defined(HAVE_LINUX_TPACKET_AUXDATA_TP_VLAN_TCI) */
- } while (packet_len == -1 && (errno == EINTR || errno == ENETDOWN));
+ } while (packet_len == -1 && errno == EINTR);
/* Check if an error occured */
if (packet_len == -1) {
- if (errno == EAGAIN)
+ switch (errno) {
+
+ case EAGAIN:
return 0; /* no packet there */
- else {
+
+ case ENETDOWN:
+ /*
+ * The device on which we're capturing went away.
+ *
+ * XXX - we should really return
+ * PCAP_ERROR_IFACE_NOT_UP, but pcap_dispatch()
+ * etc. aren't defined to return that.
+ */
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "The interface went down");
+ return PCAP_ERROR;
+
+ default:
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"recvfrom: %s", pcap_strerror(errno));
- return -1;
+ return PCAP_ERROR;
}
}
}
#if defined(HAVE_PACKET_AUXDATA) && defined(HAVE_LINUX_TPACKET_AUXDATA_TP_VLAN_TCI)
- for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
- struct tpacket_auxdata *aux;
- unsigned int len;
- struct vlan_tag *tag;
-
- if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct tpacket_auxdata)) ||
- cmsg->cmsg_level != SOL_PACKET ||
- cmsg->cmsg_type != PACKET_AUXDATA)
- continue;
+ if (handle->md.vlan_offset != -1) {
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ struct tpacket_auxdata *aux;
+ unsigned int len;
+ struct vlan_tag *tag;
- aux = (struct tpacket_auxdata *)CMSG_DATA(cmsg);
- if (aux->tp_vlan_tci == 0)
- continue;
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct tpacket_auxdata)) ||
+ cmsg->cmsg_level != SOL_PACKET ||
+ cmsg->cmsg_type != PACKET_AUXDATA)
+ continue;
- len = packet_len > iov.iov_len ? iov.iov_len : packet_len;
- if (len < 2 * ETH_ALEN)
- break;
+ aux = (struct tpacket_auxdata *)CMSG_DATA(cmsg);
+#if defined(TP_STATUS_VLAN_VALID)
+ if ((aux->tp_vlan_tci == 0) && !(aux->tp_status & TP_STATUS_VLAN_VALID))
+#else
+ if (aux->tp_vlan_tci == 0) /* this is ambigious but without the
+ TP_STATUS_VLAN_VALID flag, there is
+ nothing that we can do */
+#endif
+ continue;
- bp -= VLAN_TAG_LEN;
- memmove(bp, bp + VLAN_TAG_LEN, 2 * ETH_ALEN);
+ len = packet_len > iov.iov_len ? iov.iov_len : packet_len;
+ if (len < (unsigned int) handle->md.vlan_offset)
+ break;
- tag = (struct vlan_tag *)(bp + 2 * ETH_ALEN);
- tag->vlan_tpid = htons(ETH_P_8021Q);
- tag->vlan_tci = htons(aux->tp_vlan_tci);
+ bp -= VLAN_TAG_LEN;
+ memmove(bp, bp + VLAN_TAG_LEN, handle->md.vlan_offset);
- packet_len += VLAN_TAG_LEN;
- }
-#endif /* defined(HAVE_PACKET_AUXDATA) && defined(HAVE_LINUX_TPACKET_AUXDATA_TP_VLAN_TCI) */
+ tag = (struct vlan_tag *)(bp + handle->md.vlan_offset);
+ tag->vlan_tpid = htons(ETH_P_8021Q);
+ tag->vlan_tci = htons(aux->tp_vlan_tci);
+
+ packet_len += VLAN_TAG_LEN;
+ }
+ }
+#endif /* defined(HAVE_PACKET_AUXDATA) && defined(HAVE_LINUX_TPACKET_AUXDATA_TP_VLAN_TCI) */
#endif /* HAVE_PF_PACKET_SOCKETS */
/*
if (ioctl(handle->fd, SIOCGSTAMP, &pcap_header.ts) == -1) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"SIOCGSTAMP: %s", pcap_strerror(errno));
- return -1;
+ return PCAP_ERROR;
}
pcap_header.caplen = caplen;
pcap_header.len = packet_len;
* "ps_drop" is not supported.
*
* "ps_ifdrop" is supported. It will return the number
- * of drops the interface reports in /proc/net/dev
+ * of drops the interface reports in /proc/net/dev,
+ * if that is available.
*
* "ps_recv" doesn't include packets not yet read from
* the kernel by libpcap.
stats->ps_recv = handle->md.packets_read;
stats->ps_drop = 0;
- stats->ps_ifdrop = handle->md.stat.ps_drop;
+ stats->ps_ifdrop = handle->md.stat.ps_ifdrop;
return 0;
}
+/*
+ * Get from "/sys/class/net" all interfaces listed there; if they're
+ * already in the list of interfaces we have, that won't add another
+ * instance, but if they're not, that'll add them.
+ *
+ * We don't bother getting any addresses for them; it appears you can't
+ * use SIOCGIFADDR on Linux to get IPv6 addresses for interfaces, and,
+ * although some other types of addresses can be fetched with SIOCGIFADDR,
+ * we don't bother with them for now.
+ *
+ * We also don't fail if we couldn't open "/sys/class/net"; we just leave
+ * the list of interfaces as is, and return 0, so that we can try
+ * scanning /proc/net/dev.
+ */
+static int
+scan_sys_class_net(pcap_if_t **devlistp, char *errbuf)
+{
+ DIR *sys_class_net_d;
+ int fd;
+ struct dirent *ent;
+ char subsystem_path[PATH_MAX+1];
+ struct stat statb;
+ char *p;
+ char name[512]; /* XXX - pick a size */
+ char *q, *saveq;
+ struct ifreq ifrflags;
+ int ret = 1;
+
+ sys_class_net_d = opendir("/sys/class/net");
+ if (sys_class_net_d == NULL) {
+ /*
+ * Don't fail if it doesn't exist at all.
+ */
+ if (errno == ENOENT)
+ return (0);
+
+ /*
+ * Fail if we got some other error.
+ */
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "Can't open /sys/class/net: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ /*
+ * Create a socket from which to fetch interface information.
+ */
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "socket: %s", pcap_strerror(errno));
+ (void)closedir(sys_class_net_d);
+ return (-1);
+ }
+
+ for (;;) {
+ errno = 0;
+ ent = readdir(sys_class_net_d);
+ if (ent == NULL) {
+ /*
+ * Error or EOF; if errno != 0, it's an error.
+ */
+ break;
+ }
+
+ /*
+ * Ignore "." and "..".
+ */
+ if (strcmp(ent->d_name, ".") == 0 ||
+ strcmp(ent->d_name, "..") == 0)
+ continue;
+
+ /*
+ * Ignore plain files; they do not have subdirectories
+ * and thus have no attributes.
+ */
+ if (ent->d_type == DT_REG)
+ continue;
+
+ /*
+ * Is there an "ifindex" file under that name?
+ * (We don't care whether it's a directory or
+ * a symlink; older kernels have directories
+ * for devices, newer kernels have symlinks to
+ * directories.)
+ */
+ snprintf(subsystem_path, sizeof subsystem_path,
+ "/sys/class/net/%s/ifindex", ent->d_name);
+ if (lstat(subsystem_path, &statb) != 0) {
+ /*
+ * Stat failed. Either there was an error
+ * other than ENOENT, and we don't know if
+ * this is an interface, or it's ENOENT,
+ * and either some part of "/sys/class/net/{if}"
+ * disappeared, in which case it probably means
+ * the interface disappeared, or there's no
+ * "ifindex" file, which means it's not a
+ * network interface.
+ */
+ continue;
+ }
+
+ /*
+ * Get the interface name.
+ */
+ p = &ent->d_name[0];
+ q = &name[0];
+ while (*p != '\0' && isascii(*p) && !isspace(*p)) {
+ if (*p == ':') {
+ /*
+ * This could be the separator between a
+ * name and an alias number, or it could be
+ * the separator between a name with no
+ * alias number and the next field.
+ *
+ * If there's a colon after digits, it
+ * separates the name and the alias number,
+ * otherwise it separates the name and the
+ * next field.
+ */
+ saveq = q;
+ while (isascii(*p) && isdigit(*p))
+ *q++ = *p++;
+ if (*p != ':') {
+ /*
+ * That was the next field,
+ * not the alias number.
+ */
+ q = saveq;
+ }
+ break;
+ } else
+ *q++ = *p++;
+ }
+ *q = '\0';
+
+ /*
+ * Get the flags for this interface, and skip it if
+ * it's not up.
+ */
+ strncpy(ifrflags.ifr_name, name, sizeof(ifrflags.ifr_name));
+ if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
+ if (errno == ENXIO || errno == ENODEV)
+ continue;
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCGIFFLAGS: %.*s: %s",
+ (int)sizeof(ifrflags.ifr_name),
+ ifrflags.ifr_name,
+ pcap_strerror(errno));
+ ret = -1;
+ break;
+ }
+ if (!(ifrflags.ifr_flags & IFF_UP))
+ continue;
+
+ /*
+ * Add an entry for this interface, with no addresses.
+ */
+ if (pcap_add_if(devlistp, name, ifrflags.ifr_flags, NULL,
+ errbuf) == -1) {
+ /*
+ * Failure.
+ */
+ ret = -1;
+ break;
+ }
+ }
+ if (ret != -1) {
+ /*
+ * Well, we didn't fail for any other reason; did we
+ * fail due to an error reading the directory?
+ */
+ if (errno != 0) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "Error reading /sys/class/net: %s",
+ pcap_strerror(errno));
+ ret = -1;
+ }
+ }
+
+ (void)close(fd);
+ (void)closedir(sys_class_net_d);
+ return (ret);
+}
+
+/*
+ * Get from "/proc/net/dev" all interfaces listed there; if they're
+ * already in the list of interfaces we have, that won't add another
+ * instance, but if they're not, that'll add them.
+ *
+ * See comments from scan_sys_class_net().
+ */
+static int
+scan_proc_net_dev(pcap_if_t **devlistp, char *errbuf)
+{
+ FILE *proc_net_f;
+ int fd;
+ char linebuf[512];
+ int linenum;
+ char *p;
+ char name[512]; /* XXX - pick a size */
+ char *q, *saveq;
+ struct ifreq ifrflags;
+ int ret = 0;
+
+ proc_net_f = fopen("/proc/net/dev", "r");
+ if (proc_net_f == NULL) {
+ /*
+ * Don't fail if it doesn't exist at all.
+ */
+ if (errno == ENOENT)
+ return (0);
+
+ /*
+ * Fail if we got some other error.
+ */
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "Can't open /proc/net/dev: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ /*
+ * Create a socket from which to fetch interface information.
+ */
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd < 0) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "socket: %s", pcap_strerror(errno));
+ (void)fclose(proc_net_f);
+ return (-1);
+ }
+
+ for (linenum = 1;
+ fgets(linebuf, sizeof linebuf, proc_net_f) != NULL; linenum++) {
+ /*
+ * Skip the first two lines - they're headers.
+ */
+ if (linenum <= 2)
+ continue;
+
+ p = &linebuf[0];
+
+ /*
+ * Skip leading white space.
+ */
+ while (*p != '\0' && isascii(*p) && isspace(*p))
+ p++;
+ if (*p == '\0' || *p == '\n')
+ continue; /* blank line */
+
+ /*
+ * Get the interface name.
+ */
+ q = &name[0];
+ while (*p != '\0' && isascii(*p) && !isspace(*p)) {
+ if (*p == ':') {
+ /*
+ * This could be the separator between a
+ * name and an alias number, or it could be
+ * the separator between a name with no
+ * alias number and the next field.
+ *
+ * If there's a colon after digits, it
+ * separates the name and the alias number,
+ * otherwise it separates the name and the
+ * next field.
+ */
+ saveq = q;
+ while (isascii(*p) && isdigit(*p))
+ *q++ = *p++;
+ if (*p != ':') {
+ /*
+ * That was the next field,
+ * not the alias number.
+ */
+ q = saveq;
+ }
+ break;
+ } else
+ *q++ = *p++;
+ }
+ *q = '\0';
+
+ /*
+ * Get the flags for this interface, and skip it if
+ * it's not up.
+ */
+ strncpy(ifrflags.ifr_name, name, sizeof(ifrflags.ifr_name));
+ if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
+ if (errno == ENXIO)
+ continue;
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCGIFFLAGS: %.*s: %s",
+ (int)sizeof(ifrflags.ifr_name),
+ ifrflags.ifr_name,
+ pcap_strerror(errno));
+ ret = -1;
+ break;
+ }
+ if (!(ifrflags.ifr_flags & IFF_UP))
+ continue;
+
+ /*
+ * Add an entry for this interface, with no addresses.
+ */
+ if (pcap_add_if(devlistp, name, ifrflags.ifr_flags, NULL,
+ errbuf) == -1) {
+ /*
+ * Failure.
+ */
+ ret = -1;
+ break;
+ }
+ }
+ if (ret != -1) {
+ /*
+ * Well, we didn't fail for any other reason; did we
+ * fail due to an error reading the file?
+ */
+ if (ferror(proc_net_f)) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "Error reading /proc/net/dev: %s",
+ pcap_strerror(errno));
+ ret = -1;
+ }
+ }
+
+ (void)close(fd);
+ (void)fclose(proc_net_f);
+ return (ret);
+}
+
/*
* Description string for the "any" device.
*/
int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
+ int ret;
+
+ /*
+ * Read "/sys/class/net", and add to the list of interfaces all
+ * interfaces listed there that we don't already have, because,
+ * on Linux, SIOCGIFCONF reports only interfaces with IPv4 addresses,
+ * and even getifaddrs() won't return information about
+ * interfaces with no addresses, so you need to read "/sys/class/net"
+ * to get the names of the rest of the interfaces.
+ */
+ ret = scan_sys_class_net(alldevsp, errbuf);
+ if (ret == -1)
+ return (-1); /* failed */
+ if (ret == 0) {
+ /*
+ * No /sys/class/net; try reading /proc/net/dev instead.
+ */
+ if (scan_proc_net_dev(alldevsp, errbuf) == -1)
+ return (-1);
+ }
+
+ /*
+ * Add the "any" device.
+ */
if (pcap_add_if(alldevsp, "any", 0, any_descr, errbuf) < 0)
return (-1);
#ifdef HAVE_DAG_API
+ /*
+ * Add DAG devices.
+ */
if (dag_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif /* HAVE_DAG_API */
#ifdef HAVE_SEPTEL_API
+ /*
+ * Add Septel devices.
+ */
if (septel_platform_finddevs(alldevsp, errbuf) < 0)
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.
+ */
if (bt_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif
#ifdef PCAP_SUPPORT_USB
+ /*
+ * Add USB devices.
+ */
if (usb_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif
+#ifdef PCAP_SUPPORT_NETFILTER
+ /*
+ * Add netfilter devices.
+ */
+ if (netfilter_platform_finddevs(alldevsp, errbuf) < 0)
+ return (-1);
+#endif
+
+#if PCAP_SUPPORT_CANUSB
+ if (canusb_platform_finddevs(alldevsp, errbuf) < 0)
+ return (-1);
+#endif
+
return (0);
}
}
}
+ /*
+ * NOTE: at this point, we've set both the "len" and "filter"
+ * fields of "fcode". As of the 2.6.32.4 kernel, at least,
+ * those are the only members of the "sock_fprog" structure,
+ * so we initialize every member of that structure.
+ *
+ * If there is anything in "fcode" that is not initialized,
+ * it is either a field added in a later kernel, or it's
+ * padding.
+ *
+ * If a new field is added, this code needs to be updated
+ * to set it correctly.
+ *
+ * If there are no other fields, then:
+ *
+ * if the Linux kernel looks at the padding, it's
+ * buggy;
+ *
+ * if the Linux kernel doesn't look at the padding,
+ * then if some tool complains that we're passing
+ * uninitialized data to the kernel, then the tool
+ * is buggy and needs to understand that it's just
+ * padding.
+ */
if (can_filter_in_kernel) {
if ((err = set_kernel_filter(handle, &fcode)) == 0)
{
return -1;
}
-
#ifdef HAVE_PF_PACKET_SOCKETS
/*
* Map the PACKET_ value to a LINUX_SLL_ value; we
}
#endif
+static int
+is_wifi(int sock_fd
+#ifndef IW_MODE_MONITOR
+_U_
+#endif
+, const char *device)
+{
+ char *pathstr;
+ struct stat statb;
+#ifdef IW_MODE_MONITOR
+ char errbuf[PCAP_ERRBUF_SIZE];
+#endif
+
+ /*
+ * See if there's a sysfs wireless directory for it.
+ * If so, it's a wireless interface.
+ */
+ if (asprintf(&pathstr, "/sys/class/net/%s/wireless", device) == -1) {
+ /*
+ * Just give up here.
+ */
+ return 0;
+ }
+ if (stat(pathstr, &statb) == 0) {
+ free(pathstr);
+ return 1;
+ }
+ free(pathstr);
+
+#ifdef IW_MODE_MONITOR
+ /*
+ * OK, maybe it's not wireless, or maybe this kernel doesn't
+ * support sysfs. Try the wireless extensions.
+ */
+ if (has_wext(sock_fd, device, errbuf) == 1) {
+ /*
+ * It supports the wireless extensions, so it's a Wi-Fi
+ * device.
+ */
+ return 1;
+ }
+#endif
+ return 0;
+}
+
/*
* Linux uses the ARP hardware type to identify the type of an
* interface. pcap uses the DLT_xxx constants for this. This
*
* Sets the link type to -1 if unable to map the type.
*/
-static void map_arphrd_to_dlt(pcap_t *handle, int arptype, int cooked_ok)
+static void map_arphrd_to_dlt(pcap_t *handle, int sock_fd, int arptype,
+ const char *device, int cooked_ok)
{
+ static const char cdma_rmnet[] = "cdma_rmnet";
+
switch (arptype) {
case ARPHRD_ETHER:
/*
- * This is (presumably) a real Ethernet capture; give it a
+ * For various annoying reasons having to do with DHCP
+ * software, some versions of Android give the mobile-
+ * phone-network interface an ARPHRD_ value of
+ * ARPHRD_ETHER, even though the packets supplied by
+ * that interface have no link-layer header, and begin
+ * with an IP header, so that the ARPHRD_ value should
+ * be ARPHRD_NONE.
+ *
+ * Detect those devices by checking the device name, and
+ * use DLT_RAW for them.
+ */
+ if (strncmp(device, cdma_rmnet, sizeof cdma_rmnet - 1) == 0) {
+ handle->linktype = DLT_RAW;
+ return;
+ }
+
+ /*
+ * Is this a real Ethernet device? If so, 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
* DOCSIS frames out on the wire inside the low-level
* Ethernet framing).
*
- * XXX - are there any sorts of "fake Ethernet" that have
- * ARPHRD_ETHER but that *shouldn't offer DLT_DOCSIS as
+ * XXX - are there any other sorts of "fake Ethernet" that
+ * have ARPHRD_ETHER but that shouldn't offer DLT_DOCSIS as
* a Cisco CMTS won't put traffic onto it or get traffic
* bridged onto it? ISDN is handled in "activate_new()",
- * as we fall back on cooked mode there; are there any
+ * as we fall back on cooked mode there, and we use
+ * is_wifi() to check for 802.11 devices; are there any
* others?
*/
- handle->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
- /*
- * If that fails, just leave the list empty.
- */
- if (handle->dlt_list != NULL) {
- handle->dlt_list[0] = DLT_EN10MB;
- handle->dlt_list[1] = DLT_DOCSIS;
- handle->dlt_count = 2;
+ if (!is_wifi(sock_fd, device)) {
+ /*
+ * It's not a Wi-Fi device; offer DOCSIS.
+ */
+ handle->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
+ /*
+ * If that fails, just leave the list empty.
+ */
+ if (handle->dlt_list != NULL) {
+ handle->dlt_list[0] = DLT_EN10MB;
+ handle->dlt_list[1] = DLT_DOCSIS;
+ handle->dlt_count = 2;
+ }
}
/* FALLTHROUGH */
case ARPHRD_CHAOS:
handle->linktype = DLT_CHAOS;
break;
+#ifndef ARPHRD_CAN
+#define ARPHRD_CAN 280
+#endif
+ case ARPHRD_CAN:
+ handle->linktype = DLT_CAN_SOCKETCAN;
+ break;
#ifndef ARPHRD_IEEE802_TR
#define ARPHRD_IEEE802_TR 800 /* From Linux 2.4 */
handle->linktype = DLT_RAW;
break;
+#ifndef ARPHRD_IEEE802154
+#define ARPHRD_IEEE802154 804
+#endif
+ case ARPHRD_IEEE802154:
+ handle->linktype = DLT_IEEE802_15_4_NOFCS;
+ break;
+
default:
handle->linktype = -1;
break;
socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (sock_fd == -1) {
+ if (errno == EINVAL || errno == EAFNOSUPPORT) {
+ /*
+ * We don't support PF_PACKET/SOCK_whatever
+ * sockets; try the old mechanism.
+ */
+ return 0;
+ }
+
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
pcap_strerror(errno) );
- return 0; /* try old mechanism */
+ if (errno == EPERM || errno == EACCES) {
+ /*
+ * You don't have permission to open the
+ * socket.
+ */
+ return PCAP_ERROR_PERM_DENIED;
+ } else {
+ /*
+ * Other error.
+ */
+ return PCAP_ERROR;
+ }
}
/* It seems the kernel supports the new interface. */
close(sock_fd);
return arptype;
}
- map_arphrd_to_dlt(handle, arptype, 1);
+ map_arphrd_to_dlt(handle, sock_fd, arptype, device, 1);
if (handle->linktype == -1 ||
handle->linktype == DLT_LINUX_SLL ||
handle->linktype == DLT_LINUX_IRDA ||
if (sock_fd == -1) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"socket: %s", pcap_strerror(errno));
- return PCAP_ERROR;
+ if (errno == EPERM || errno == EACCES) {
+ /*
+ * You don't have permission to
+ * open the socket.
+ */
+ return PCAP_ERROR_PERM_DENIED;
+ } else {
+ /*
+ * Other error.
+ */
+ return PCAP_ERROR;
+ }
}
handle->md.cooked = 1;
}
handle->bufsize = handle->snapshot;
+ /*
+ * Set the offset at which to insert VLAN tags.
+ */
+ switch (handle->linktype) {
+
+ case DLT_EN10MB:
+ handle->md.vlan_offset = 2 * ETH_ALEN;
+ break;
+
+ case DLT_LINUX_SLL:
+ handle->md.vlan_offset = 14;
+ break;
+
+ default:
+ handle->md.vlan_offset = -1; /* unknown */
+ break;
+ }
+
/* Save the socket FD in the pcap structure */
handle->fd = sock_fd;
#endif
}
+#ifdef HAVE_PACKET_RING
+/*
+ * Attempt to activate with memory-mapped access.
+ *
+ * On success, returns 1, and sets *status to 0 if there are no warnings
+ * or to a PCAP_WARNING_ code if there is a warning.
+ *
+ * On failure due to lack of support for memory-mapped capture, returns
+ * 0.
+ *
+ * On error, returns -1, and sets *status to the appropriate error code;
+ * if that is PCAP_ERROR, sets handle->errbuf to the appropriate message.
+ */
static int
-activate_mmap(pcap_t *handle)
+activate_mmap(pcap_t *handle, int *status)
{
-#ifdef HAVE_PACKET_RING
int ret;
/*
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"can't allocate oneshot buffer: %s",
pcap_strerror(errno));
- return PCAP_ERROR;
+ *status = PCAP_ERROR;
+ return -1;
}
if (handle->opt.buffer_size == 0) {
handle->opt.buffer_size = 2*1024*1024;
}
ret = prepare_tpacket_socket(handle);
- if (ret != 1) {
+ if (ret == -1) {
free(handle->md.oneshot_buffer);
+ *status = PCAP_ERROR;
return ret;
}
- ret = create_ring(handle);
- if (ret != 1) {
+ ret = create_ring(handle, status);
+ if (ret == 0) {
+ /*
+ * We don't support memory-mapped capture; our caller
+ * will fall back on reading from the socket.
+ */
free(handle->md.oneshot_buffer);
- return ret;
+ return 0;
+ }
+ if (ret == -1) {
+ /*
+ * Error attempting to enable memory-mapped capture;
+ * fail. create_ring() has set *status.
+ */
+ free(handle->md.oneshot_buffer);
+ return -1;
}
- /* override some defaults and inherit the other fields from
- * activate_new
- * handle->offset is used to get the current position into the rx ring
- * handle->cc is used to store the ring size */
+ /*
+ * Success. *status has been set either to 0 if there are no
+ * warnings or to a PCAP_WARNING_ value if there is a warning.
+ *
+ * Override some defaults and inherit the other fields from
+ * activate_new.
+ * handle->offset is used to get the current position into the rx ring.
+ * handle->cc is used to store the ring size.
+ */
handle->read_op = pcap_read_linux_mmap;
handle->cleanup_op = pcap_cleanup_linux_mmap;
handle->setfilter_op = pcap_setfilter_linux_mmap;
handle->oneshot_callback = pcap_oneshot_mmap;
handle->selectable_fd = handle->fd;
return 1;
+}
#else /* HAVE_PACKET_RING */
+static int
+activate_mmap(pcap_t *handle _U_, int *status _U_)
+{
return 0;
-#endif /* HAVE_PACKET_RING */
}
+#endif /* HAVE_PACKET_RING */
#ifdef HAVE_PACKET_RING
+/*
+ * Attempt to set the socket to version 2 of the memory-mapped header.
+ * Return 1 if we succeed or if we fail because version 2 isn't
+ * supported; return -1 on any other error, and set handle->errbuf.
+ */
static int
prepare_tpacket_socket(pcap_t *handle)
{
return 1;
}
+/*
+ * Attempt to set up memory-mapped access.
+ *
+ * On success, returns 1, and sets *status to 0 if there are no warnings
+ * or to a PCAP_WARNING_ code if there is a warning.
+ *
+ * On failure due to lack of support for memory-mapped capture, returns
+ * 0.
+ *
+ * On error, returns -1, and sets *status to the appropriate error code;
+ * if that is PCAP_ERROR, sets handle->errbuf to the appropriate message.
+ */
static int
-create_ring(pcap_t *handle)
+create_ring(pcap_t *handle, int *status)
{
unsigned i, j, frames_per_block;
struct tpacket_req req;
+ socklen_t len;
+ unsigned int sk_type, tp_reserve, maclen, tp_hdrlen, netoff, macoff;
+ unsigned int frame_size;
- /* Note that with large snapshot (say 64K) only a few frames
- * will be available in the ring even with pretty large ring size
- * (and a lot of memory will be unused).
- * The snap len should be carefully chosen to achive best
- * performance */
- req.tp_frame_size = TPACKET_ALIGN(handle->snapshot +
- TPACKET_ALIGN(handle->md.tp_hdrlen) +
- sizeof(struct sockaddr_ll));
+ /*
+ * Start out assuming no warnings or errors.
+ */
+ *status = 0;
+
+ /* Note that with large snapshot length (say 64K, which is the default
+ * for recent versions of tcpdump, the value that "-s 0" has given
+ * for a long time with tcpdump, and the default in Wireshark/TShark),
+ * if we use the snapshot length to calculate the frame length,
+ * only a few frames will be available in the ring even with pretty
+ * large ring size (and a lot of memory will be unused).
+ *
+ * Ideally, we should choose a frame length based on the
+ * minimum of the specified snapshot length and the maximum
+ * packet size. That's not as easy as it sounds; consider, for
+ * example, an 802.11 interface in monitor mode, where the
+ * frame would include a radiotap header, where the maximum
+ * radiotap header length is device-dependent.
+ *
+ * So, for now, we just do this for Ethernet devices, where
+ * there's no metadata header, and the link-layer header is
+ * fixed length. We can get the maximum packet size by
+ * adding 18, the Ethernet header length plus the CRC length
+ * (just in case we happen to get the CRC in the packet), to
+ * the MTU of the interface; we fetch the MTU in the hopes
+ * that it reflects support for jumbo frames. (Even if the
+ * interface is just being used for passive snooping, the driver
+ * might set the size of buffers in the receive ring based on
+ * the MTU, so that the MTU limits the maximum size of packets
+ * that we can receive.)
+ *
+ * We don't do that if segmentation/fragmentation or receive
+ * offload are enabled, so we don't get rudely surprised by
+ * "packets" bigger than the MTU. */
+ frame_size = handle->snapshot;
+ if (handle->linktype == DLT_EN10MB) {
+ int mtu;
+ int offload;
+
+ offload = iface_get_offload(handle);
+ if (offload == -1) {
+ *status = PCAP_ERROR;
+ return -1;
+ }
+ if (!offload) {
+ mtu = iface_get_mtu(handle->fd, handle->opt.source,
+ handle->errbuf);
+ if (mtu == -1) {
+ *status = PCAP_ERROR;
+ return -1;
+ }
+ if (frame_size > mtu + 18)
+ frame_size = mtu + 18;
+ }
+ }
+
+ /* NOTE: calculus matching those in tpacket_rcv()
+ * in linux-2.6/net/packet/af_packet.c
+ */
+ len = sizeof(sk_type);
+ if (getsockopt(handle->fd, SOL_SOCKET, SO_TYPE, &sk_type, &len) < 0) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "getsockopt: %s", pcap_strerror(errno));
+ *status = PCAP_ERROR;
+ return -1;
+ }
+#ifdef PACKET_RESERVE
+ len = sizeof(tp_reserve);
+ if (getsockopt(handle->fd, SOL_PACKET, PACKET_RESERVE, &tp_reserve, &len) < 0) {
+ if (errno != ENOPROTOOPT) {
+ /*
+ * ENOPROTOOPT means "kernel doesn't support
+ * PACKET_RESERVE", in which case we fall back
+ * as best we can.
+ */
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "getsockopt: %s", pcap_strerror(errno));
+ *status = PCAP_ERROR;
+ return -1;
+ }
+ tp_reserve = 0; /* older kernel, reserve not supported */
+ }
+#else
+ tp_reserve = 0; /* older kernel, reserve not supported */
+#endif
+ maclen = (sk_type == SOCK_DGRAM) ? 0 : MAX_LINKHEADER_SIZE;
+ /* XXX: in the kernel maclen is calculated from
+ * LL_ALLOCATED_SPACE(dev) and vnet_hdr.hdr_len
+ * in: packet_snd() in linux-2.6/net/packet/af_packet.c
+ * then packet_alloc_skb() in linux-2.6/net/packet/af_packet.c
+ * then sock_alloc_send_pskb() in linux-2.6/net/core/sock.c
+ * but I see no way to get those sizes in userspace,
+ * like for instance with an ifreq ioctl();
+ * the best thing I've found so far is MAX_HEADER in the kernel
+ * part of linux-2.6/include/linux/netdevice.h
+ * which goes up to 128+48=176; since pcap-linux.c defines
+ * a MAX_LINKHEADER_SIZE of 256 which is greater than that,
+ * let's use it.. maybe is it even large enough to directly
+ * replace macoff..
+ */
+ tp_hdrlen = TPACKET_ALIGN(handle->md.tp_hdrlen) + sizeof(struct sockaddr_ll) ;
+ netoff = TPACKET_ALIGN(tp_hdrlen + (maclen < 16 ? 16 : maclen)) + tp_reserve;
+ /* NOTE: AFAICS tp_reserve may break the TPACKET_ALIGN of
+ * netoff, which contradicts
+ * linux-2.6/Documentation/networking/packet_mmap.txt
+ * documenting that:
+ * "- Gap, chosen so that packet data (Start+tp_net)
+ * aligns to TPACKET_ALIGNMENT=16"
+ */
+ /* NOTE: in linux-2.6/include/linux/skbuff.h:
+ * "CPUs often take a performance hit
+ * when accessing unaligned memory locations"
+ */
+ macoff = netoff - maclen;
+ req.tp_frame_size = TPACKET_ALIGN(macoff + frame_size);
req.tp_frame_nr = handle->opt.buffer_size/req.tp_frame_size;
/* compute the minumum block size that will handle this frame.
while (req.tp_block_size < req.tp_frame_size)
req.tp_block_size <<= 1;
- frames_per_block = req.tp_block_size/req.tp_frame_size;
+ frames_per_block = req.tp_block_size/req.tp_frame_size;
+
+ /*
+ * PACKET_TIMESTAMP was added after linux/net_tstamp.h was,
+ * so we check for PACKET_TIMESTAMP. We check for
+ * linux/net_tstamp.h just in case a system somehow has
+ * PACKET_TIMESTAMP but not linux/net_tstamp.h; that might
+ * be unnecessary.
+ *
+ * SIOCSHWTSTAMP was introduced in the patch that introduced
+ * linux/net_tstamp.h, so we don't bother checking whether
+ * SIOCSHWTSTAMP is defined (if your Linux system has
+ * linux/net_tstamp.h but doesn't define SIOCSHWTSTAMP, your
+ * Linux system is badly broken).
+ */
+#if defined(HAVE_LINUX_NET_TSTAMP_H) && defined(PACKET_TIMESTAMP)
+ /*
+ * If we were told to do so, ask the kernel and the driver
+ * to use hardware timestamps.
+ *
+ * Hardware timestamps are only supported with mmapped
+ * captures.
+ */
+ if (handle->opt.tstamp_type == PCAP_TSTAMP_ADAPTER ||
+ handle->opt.tstamp_type == PCAP_TSTAMP_ADAPTER_UNSYNCED) {
+ struct hwtstamp_config hwconfig;
+ struct ifreq ifr;
+ int timesource;
+
+ /*
+ * Ask for hardware time stamps on all packets,
+ * including transmitted packets.
+ */
+ memset(&hwconfig, 0, sizeof(hwconfig));
+ hwconfig.tx_type = HWTSTAMP_TX_ON;
+ hwconfig.rx_filter = HWTSTAMP_FILTER_ALL;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strcpy(ifr.ifr_name, handle->opt.source);
+ ifr.ifr_data = (void *)&hwconfig;
+
+ if (ioctl(handle->fd, SIOCSHWTSTAMP, &ifr) < 0) {
+ switch (errno) {
+
+ case EPERM:
+ /*
+ * Treat this as an error, as the
+ * user should try to run this
+ * with the appropriate privileges -
+ * and, if they can't, shouldn't
+ * try requesting hardware time stamps.
+ */
+ *status = PCAP_ERROR_PERM_DENIED;
+ return -1;
+
+ case EOPNOTSUPP:
+ /*
+ * Treat this as a warning, as the
+ * only way to fix the warning is to
+ * get an adapter that supports hardware
+ * time stamps. We'll just fall back
+ * on the standard host time stamps.
+ */
+ *status = PCAP_WARNING_TSTAMP_TYPE_NOTSUP;
+ break;
+
+ default:
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCSHWTSTAMP failed: %s",
+ pcap_strerror(errno));
+ *status = PCAP_ERROR;
+ return -1;
+ }
+ } else {
+ /*
+ * Well, that worked. Now specify the type of
+ * hardware time stamp we want for this
+ * socket.
+ */
+ if (handle->opt.tstamp_type == PCAP_TSTAMP_ADAPTER) {
+ /*
+ * Hardware timestamp, synchronized
+ * with the system clock.
+ */
+ timesource = SOF_TIMESTAMPING_SYS_HARDWARE;
+ } else {
+ /*
+ * PCAP_TSTAMP_ADAPTER_UNSYNCED - hardware
+ * timestamp, not synchronized with the
+ * system clock.
+ */
+ timesource = SOF_TIMESTAMPING_RAW_HARDWARE;
+ }
+ if (setsockopt(handle->fd, SOL_PACKET, PACKET_TIMESTAMP,
+ (void *)×ource, sizeof(timesource))) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "can't set PACKET_TIMESTAMP: %s",
+ pcap_strerror(errno));
+ *status = PCAP_ERROR;
+ return -1;
+ }
+ }
+ }
+#endif /* HAVE_LINUX_NET_TSTAMP_H && PACKET_TIMESTAMP */
/* ask the kernel to create the ring */
retry:
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"can't create rx ring on packet socket: %s",
pcap_strerror(errno));
+ *status = PCAP_ERROR;
return -1;
}
/* clear the allocated ring on error*/
destroy_ring(handle);
+ *status = PCAP_ERROR;
return -1;
}
pcap_strerror(errno));
destroy_ring(handle);
+ *status = PCAP_ERROR;
return -1;
}
return h.raw;
}
+#ifndef POLLRDHUP
+#define POLLRDHUP 0
+#endif
+
static int
pcap_read_linux_mmap(pcap_t *handle, int max_packets, pcap_handler callback,
u_char *user)
{
+ int timeout;
int pkts = 0;
+ char c;
/* wait for frames availability.*/
- if ((handle->md.timeout >= 0) &&
- !pcap_get_ring_frame(handle, TP_STATUS_USER)) {
+ if (!pcap_get_ring_frame(handle, TP_STATUS_USER)) {
struct pollfd pollinfo;
int ret;
pollinfo.fd = handle->fd;
pollinfo.events = POLLIN;
+ if (handle->md.timeout == 0)
+ timeout = -1; /* block forever */
+ else if (handle->md.timeout > 0)
+ timeout = handle->md.timeout; /* block for that amount of time */
+ else
+ timeout = 0; /* non-blocking mode - poll to pick up errors */
do {
- /* poll() requires a negative timeout to wait forever */
- ret = poll(&pollinfo, 1, (handle->md.timeout > 0)?
- handle->md.timeout: -1);
- if ((ret < 0) && (errno != EINTR)) {
+ ret = poll(&pollinfo, 1, timeout);
+ if (ret < 0 && errno != EINTR) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "can't poll on packet socket fd %d: %d-%s",
- handle->fd, errno, pcap_strerror(errno));
- return -1;
- }
+ "can't poll on packet socket: %s",
+ pcap_strerror(errno));
+ return PCAP_ERROR;
+ } else if (ret > 0 &&
+ (pollinfo.revents & (POLLHUP|POLLRDHUP|POLLERR|POLLNVAL))) {
+ /*
+ * There's some indication other than
+ * "you can read on this descriptor" on
+ * the descriptor.
+ */
+ if (pollinfo.revents & (POLLHUP | POLLRDHUP)) {
+ snprintf(handle->errbuf,
+ PCAP_ERRBUF_SIZE,
+ "Hangup on packet socket");
+ return PCAP_ERROR;
+ }
+ if (pollinfo.revents & POLLERR) {
+ /*
+ * A recv() will give us the
+ * actual error code.
+ *
+ * XXX - make the socket non-blocking?
+ */
+ if (recv(handle->fd, &c, sizeof c,
+ MSG_PEEK) != -1)
+ continue; /* what, no error? */
+ if (errno == ENETDOWN) {
+ /*
+ * The device on which we're
+ * capturing went away.
+ *
+ * XXX - we should really return
+ * PCAP_ERROR_IFACE_NOT_UP,
+ * but pcap_dispatch() etc.
+ * aren't defined to return
+ * that.
+ */
+ snprintf(handle->errbuf,
+ PCAP_ERRBUF_SIZE,
+ "The interface went down");
+ } else {
+ snprintf(handle->errbuf,
+ PCAP_ERRBUF_SIZE,
+ "Error condition on packet socket: %s",
+ strerror(errno));
+ }
+ return PCAP_ERROR;
+ }
+ if (pollinfo.revents & POLLNVAL) {
+ snprintf(handle->errbuf,
+ PCAP_ERRBUF_SIZE,
+ "Invalid polling request on packet socket");
+ return PCAP_ERROR;
+ }
+ }
/* check for break loop condition on interrupted syscall*/
if (handle->break_loop) {
handle->break_loop = 0;
- return -2;
+ return PCAP_ERROR_BREAK;
}
} while (ret < 0);
}
if (tp_mac + tp_snaplen > handle->bufsize) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"corrupted frame on kernel ring mac "
- "offset %d + caplen %d > frame len %d",
+ "offset %u + caplen %u > frame len %d",
tp_mac, tp_snaplen, handle->bufsize);
return -1;
}
}
#ifdef HAVE_TPACKET2
- if (handle->md.tp_version == TPACKET_V2 && h.h2->tp_vlan_tci &&
- tp_snaplen >= 2 * ETH_ALEN) {
+ if ((handle->md.tp_version == TPACKET_V2) &&
+#if defined(TP_STATUS_VLAN_VALID)
+ (h.h2->tp_vlan_tci || (h.h2->tp_status & TP_STATUS_VLAN_VALID)) &&
+#else
+ h.h2->tp_vlan_tci &&
+#endif
+ handle->md.vlan_offset != -1 &&
+ tp_snaplen >= (unsigned int) handle->md.vlan_offset) {
struct vlan_tag *tag;
bp -= VLAN_TAG_LEN;
- memmove(bp, bp + VLAN_TAG_LEN, 2 * ETH_ALEN);
+ memmove(bp, bp + VLAN_TAG_LEN, handle->md.vlan_offset);
- tag = (struct vlan_tag *)(bp + 2 * ETH_ALEN);
+ tag = (struct vlan_tag *)(bp + handle->md.vlan_offset);
tag->vlan_tpid = htons(ETH_P_8021Q);
tag->vlan_tci = htons(h.h2->tp_vlan_tci);
/* check for break loop condition*/
if (handle->break_loop) {
handle->break_loop = 0;
- return -2;
+ return PCAP_ERROR_BREAK;
}
}
return pkts;
monitor_type montype;
int i;
__u32 cmd;
+ struct ifreq ifr;
+ int oldflags;
int args[2];
int channel;
err = has_wext(sock_fd, device, handle->errbuf);
if (err <= 0)
return err; /* either it doesn't or the device doesn't even exist */
+ /*
+ * Start out assuming we have no private extensions to control
+ * radio metadata.
+ */
+ montype = MONITOR_WEXT;
+ cmd = 0;
+
/*
* Try to get all the Wireless Extensions private ioctls
* supported by this device.
device);
return PCAP_ERROR;
}
- if (errno == EOPNOTSUPP) {
- /*
- * No private ioctls, so we assume that there's only one
- * DLT_ for monitor mode.
- */
- return 0;
- }
- if (errno != E2BIG) {
+ if (errno != EOPNOTSUPP) {
/*
- * Failed.
+ * OK, it's not as if there are no private ioctls.
*/
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "%s: SIOCGIWPRIV: %s", device, pcap_strerror(errno));
- return PCAP_ERROR;
- }
- priv = malloc(ireq.u.data.length * sizeof (struct iw_priv_args));
- if (priv == NULL) {
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "malloc: %s", pcap_strerror(errno));
- return PCAP_ERROR;
- }
- ireq.u.data.pointer = (void *)priv;
- if (ioctl(sock_fd, SIOCGIWPRIV, &ireq) == -1) {
- snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
- "%s: SIOCGIWPRIV: %s", device, pcap_strerror(errno));
- free(priv);
- return PCAP_ERROR;
- }
-
- /*
- * Look for private ioctls to turn monitor mode on or, if
- * monitor mode is on, to set the header type.
- */
- montype = MONITOR_WEXT;
- cmd = 0;
- for (i = 0; i < ireq.u.data.length; i++) {
- if (strcmp(priv[i].name, "monitor_type") == 0) {
- /*
- * Hostap driver, use this one.
- * Set monitor mode first.
- * You can set it to 0 to get DLT_IEEE80211,
- * 1 to get DLT_PRISM, 2 to get
- * DLT_IEEE80211_RADIO_AVS, and, with more
- * recent versions of the driver, 3 to get
- * DLT_IEEE80211_RADIO.
- */
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
- break;
- if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
- break;
- if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
- break;
- montype = MONITOR_HOSTAP;
- cmd = priv[i].cmd;
- break;
- }
- if (strcmp(priv[i].name, "set_prismhdr") == 0) {
- /*
- * Prism54 driver, use this one.
- * Set monitor mode first.
- * You can set it to 2 to get DLT_IEEE80211
- * or 3 or get DLT_PRISM.
- */
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
- break;
- if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
- break;
- if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
- break;
- montype = MONITOR_PRISM54;
- cmd = priv[i].cmd;
- break;
- }
- if (strcmp(priv[i].name, "forceprismheader") == 0) {
+ if (errno != E2BIG) {
/*
- * RT2570 driver, use this one.
- * Do this after turning monitor mode on.
- * You can set it to 1 to get DLT_PRISM or 2
- * to get DLT_IEEE80211.
+ * Failed.
*/
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
- break;
- if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
- break;
- if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
- break;
- montype = MONITOR_RT2570;
- cmd = priv[i].cmd;
- break;
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: SIOCGIWPRIV: %s", device,
+ pcap_strerror(errno));
+ return PCAP_ERROR;
}
- if (strcmp(priv[i].name, "forceprism") == 0) {
- /*
- * RT73 driver, use this one.
- * Do this after turning monitor mode on.
- * Its argument is a *string*; you can
- * set it to "1" to get DLT_PRISM or "2"
- * to get DLT_IEEE80211.
- */
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_CHAR)
- break;
- if (priv[i].set_args & IW_PRIV_SIZE_FIXED)
- break;
- montype = MONITOR_RT73;
- cmd = priv[i].cmd;
- break;
+
+ /*
+ * OK, try to get the list of private ioctls.
+ */
+ priv = malloc(ireq.u.data.length * sizeof (struct iw_priv_args));
+ if (priv == NULL) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ return PCAP_ERROR;
}
- if (strcmp(priv[i].name, "prismhdr") == 0) {
- /*
- * One of the RTL8xxx drivers, use this one.
- * It can only be done after monitor mode
- * has been turned on. You can set it to 1
- * to get DLT_PRISM or 0 to get DLT_IEEE80211.
- */
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
- break;
- if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
- break;
- if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
- break;
- montype = MONITOR_RTL8XXX;
- cmd = priv[i].cmd;
- break;
+ ireq.u.data.pointer = (void *)priv;
+ if (ioctl(sock_fd, SIOCGIWPRIV, &ireq) == -1) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: SIOCGIWPRIV: %s", device,
+ pcap_strerror(errno));
+ free(priv);
+ return PCAP_ERROR;
}
- if (strcmp(priv[i].name, "rfmontx") == 0) {
- /*
- * RT2500 or RT61 driver, use this one.
- * It has one one-byte parameter; set
- * u.data.length to 1 and u.data.pointer to
- * point to the parameter.
- * It doesn't itself turn monitor mode on.
- * You can set it to 1 to allow transmitting
- * in monitor mode(?) and get DLT_IEEE80211,
- * or set it to 0 to disallow transmitting in
- * monitor mode(?) and get DLT_PRISM.
- */
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
- break;
- if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 2)
+
+ /*
+ * Look for private ioctls to turn monitor mode on or, if
+ * monitor mode is on, to set the header type.
+ */
+ for (i = 0; i < ireq.u.data.length; i++) {
+ if (strcmp(priv[i].name, "monitor_type") == 0) {
+ /*
+ * Hostap driver, use this one.
+ * Set monitor mode first.
+ * You can set it to 0 to get DLT_IEEE80211,
+ * 1 to get DLT_PRISM, 2 to get
+ * DLT_IEEE80211_RADIO_AVS, and, with more
+ * recent versions of the driver, 3 to get
+ * DLT_IEEE80211_RADIO.
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ break;
+ if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
+ break;
+ if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
+ break;
+ montype = MONITOR_HOSTAP;
+ cmd = priv[i].cmd;
break;
- montype = MONITOR_RT2500;
- cmd = priv[i].cmd;
- break;
- }
- if (strcmp(priv[i].name, "monitor") == 0) {
- /*
- * Either ACX100 or hostap, use this one.
- * It turns monitor mode on.
- * If it takes two arguments, it's ACX100;
- * the first argument is 1 for DLT_PRISM
- * or 2 for DLT_IEEE80211, and the second
- * argument is the channel on which to
- * run. If it takes one argument, it's
- * HostAP, and the argument is 2 for
- * DLT_IEEE80211 and 3 for DLT_PRISM.
- *
- * If we see this, we don't quit, as this
- * might be a version of the hostap driver
- * that also supports "monitor_type".
- */
- if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ }
+ if (strcmp(priv[i].name, "set_prismhdr") == 0) {
+ /*
+ * Prism54 driver, use this one.
+ * Set monitor mode first.
+ * You can set it to 2 to get DLT_IEEE80211
+ * or 3 or get DLT_PRISM.
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ break;
+ if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
+ break;
+ if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
+ break;
+ montype = MONITOR_PRISM54;
+ cmd = priv[i].cmd;
break;
- if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
+ }
+ if (strcmp(priv[i].name, "forceprismheader") == 0) {
+ /*
+ * RT2570 driver, use this one.
+ * Do this after turning monitor mode on.
+ * You can set it to 1 to get DLT_PRISM or 2
+ * to get DLT_IEEE80211.
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ break;
+ if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
+ break;
+ if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
+ break;
+ montype = MONITOR_RT2570;
+ cmd = priv[i].cmd;
break;
- switch (priv[i].set_args & IW_PRIV_SIZE_MASK) {
-
- case 1:
- montype = MONITOR_PRISM;
+ }
+ if (strcmp(priv[i].name, "forceprism") == 0) {
+ /*
+ * RT73 driver, use this one.
+ * Do this after turning monitor mode on.
+ * Its argument is a *string*; you can
+ * set it to "1" to get DLT_PRISM or "2"
+ * to get DLT_IEEE80211.
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_CHAR)
+ break;
+ if (priv[i].set_args & IW_PRIV_SIZE_FIXED)
+ break;
+ montype = MONITOR_RT73;
cmd = priv[i].cmd;
break;
-
- case 2:
- montype = MONITOR_ACX100;
+ }
+ if (strcmp(priv[i].name, "prismhdr") == 0) {
+ /*
+ * One of the RTL8xxx drivers, use this one.
+ * It can only be done after monitor mode
+ * has been turned on. You can set it to 1
+ * to get DLT_PRISM or 0 to get DLT_IEEE80211.
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ break;
+ if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
+ break;
+ if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 1)
+ break;
+ montype = MONITOR_RTL8XXX;
cmd = priv[i].cmd;
break;
-
- default:
+ }
+ if (strcmp(priv[i].name, "rfmontx") == 0) {
+ /*
+ * RT2500 or RT61 driver, use this one.
+ * It has one one-byte parameter; set
+ * u.data.length to 1 and u.data.pointer to
+ * point to the parameter.
+ * It doesn't itself turn monitor mode on.
+ * You can set it to 1 to allow transmitting
+ * in monitor mode(?) and get DLT_IEEE80211,
+ * or set it to 0 to disallow transmitting in
+ * monitor mode(?) and get DLT_PRISM.
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ break;
+ if ((priv[i].set_args & IW_PRIV_SIZE_MASK) != 2)
+ break;
+ montype = MONITOR_RT2500;
+ cmd = priv[i].cmd;
break;
}
+ if (strcmp(priv[i].name, "monitor") == 0) {
+ /*
+ * Either ACX100 or hostap, use this one.
+ * It turns monitor mode on.
+ * If it takes two arguments, it's ACX100;
+ * the first argument is 1 for DLT_PRISM
+ * or 2 for DLT_IEEE80211, and the second
+ * argument is the channel on which to
+ * run. If it takes one argument, it's
+ * HostAP, and the argument is 2 for
+ * DLT_IEEE80211 and 3 for DLT_PRISM.
+ *
+ * If we see this, we don't quit, as this
+ * might be a version of the hostap driver
+ * that also supports "monitor_type".
+ */
+ if ((priv[i].set_args & IW_PRIV_TYPE_MASK) != IW_PRIV_TYPE_INT)
+ break;
+ if (!(priv[i].set_args & IW_PRIV_SIZE_FIXED))
+ break;
+ switch (priv[i].set_args & IW_PRIV_SIZE_MASK) {
+
+ case 1:
+ montype = MONITOR_PRISM;
+ cmd = priv[i].cmd;
+ break;
+
+ case 2:
+ montype = MONITOR_ACX100;
+ cmd = priv[i].cmd;
+ break;
+
+ default:
+ break;
+ }
+ }
}
+ free(priv);
}
- free(priv);
/*
* XXX - ipw3945? islism?
}
/*
- * First, turn monitor mode on.
+ * First, take the interface down if it's up; otherwise, we
+ * might get EBUSY.
+ */
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, &ifr) == -1) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: Can't get flags: %s", device, strerror(errno));
+ return PCAP_ERROR;
+ }
+ oldflags = 0;
+ if (ifr.ifr_flags & IFF_UP) {
+ oldflags = ifr.ifr_flags;
+ ifr.ifr_flags &= ~IFF_UP;
+ if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr) == -1) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: Can't set flags: %s", device, strerror(errno));
+ return PCAP_ERROR;
+ }
+ }
+
+ /*
+ * Then turn monitor mode on.
*/
strncpy(ireq.ifr_ifrn.ifrn_name, device,
sizeof ireq.ifr_ifrn.ifrn_name);
if (ioctl(sock_fd, SIOCSIWMODE, &ireq) == -1) {
/*
* Scientist, you've failed.
+ * Bring the interface back up if we shut it down.
*/
+ ifr.ifr_flags = oldflags;
+ if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr) == -1) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: Can't set flags: %s", device, strerror(errno));
+ return PCAP_ERROR;
+ }
return PCAP_ERROR_RFMON_NOTSUP;
}
break;
}
+ /*
+ * Now bring the interface back up if we brought it down.
+ */
+ if (oldflags != 0) {
+ ifr.ifr_flags = oldflags;
+ if (ioctl(sock_fd, SIOCSIFFLAGS, &ifr) == -1) {
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: Can't set flags: %s", device, strerror(errno));
+
+ /*
+ * At least try to restore the old mode on the
+ * interface.
+ */
+ if (ioctl(handle->fd, SIOCSIWMODE, &ireq) == -1) {
+ /*
+ * Scientist, you've failed.
+ */
+ fprintf(stderr,
+ "Can't restore interface wireless mode (SIOCSIWMODE failed: %s).\n"
+ "Please adjust manually.\n",
+ strerror(errno));
+ }
+ return PCAP_ERROR;
+ }
+ }
+
/*
* Note that we have to put the old mode back when we
* close the device.
return 0;
}
+/*
+ * Find out if we have any form of fragmentation/reassembly offloading.
+ *
+ * We do so using SIOCETHTOOL checking for various types of offloading;
+ * if SIOCETHTOOL isn't defined, or we don't have any #defines for any
+ * of the types of offloading, there's nothing we can do to check, so
+ * we just say "no, we don't".
+ */
+#if defined(SIOCETHTOOL) && (defined(ETHTOOL_GTSO) || defined(ETHTOOL_GUFO) || defined(ETHTOOL_GGSO) || defined(ETHTOOL_GFLAGS) || defined(ETHTOOL_GGRO))
+static int
+iface_ethtool_ioctl(pcap_t *handle, int cmd, const char *cmdname)
+{
+ struct ifreq ifr;
+ struct ethtool_value eval;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, handle->opt.source, sizeof(ifr.ifr_name));
+ eval.cmd = cmd;
+ ifr.ifr_data = (caddr_t)&eval;
+ if (ioctl(handle->fd, SIOCETHTOOL, &ifr) == -1) {
+ if (errno == EOPNOTSUPP || errno == EINVAL) {
+ /*
+ * OK, let's just return 0, which, in our
+ * case, either means "no, what we're asking
+ * about is not enabled" or "all the flags
+ * are clear (i.e., nothing is enabled)".
+ */
+ return 0;
+ }
+ snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: SIOETHTOOL(%s) ioctl failed: %s", handle->opt.source,
+ cmdname, strerror(errno));
+ return -1;
+ }
+ return eval.data;
+}
+
+static int
+iface_get_offload(pcap_t *handle)
+{
+ int ret;
+
+#ifdef ETHTOOL_GTSO
+ ret = iface_ethtool_ioctl(handle, ETHTOOL_GTSO, "ETHTOOL_GTSO");
+ if (ret == -1)
+ return -1;
+ if (ret)
+ return 1; /* TCP segmentation offloading on */
+#endif
+
+#ifdef ETHTOOL_GUFO
+ ret = iface_ethtool_ioctl(handle, ETHTOOL_GUFO, "ETHTOOL_GUFO");
+ if (ret == -1)
+ return -1;
+ if (ret)
+ return 1; /* UDP fragmentation offloading on */
+#endif
+
+#ifdef ETHTOOL_GGSO
+ /*
+ * XXX - will this cause large unsegmented packets to be
+ * handed to PF_PACKET sockets on transmission? If not,
+ * this need not be checked.
+ */
+ ret = iface_ethtool_ioctl(handle, ETHTOOL_GGSO, "ETHTOOL_GGSO");
+ if (ret == -1)
+ return -1;
+ if (ret)
+ return 1; /* generic segmentation offloading on */
+#endif
+
+#ifdef ETHTOOL_GFLAGS
+ ret = iface_ethtool_ioctl(handle, ETHTOOL_GFLAGS, "ETHTOOL_GFLAGS");
+ if (ret == -1)
+ return -1;
+ if (ret & ETH_FLAG_LRO)
+ return 1; /* large receive offloading on */
+#endif
+
+#ifdef ETHTOOL_GGRO
+ /*
+ * XXX - will this cause large reassembled packets to be
+ * handed to PF_PACKET sockets on receipt? If not,
+ * this need not be checked.
+ */
+ ret = iface_ethtool_ioctl(handle, ETHTOOL_GGRO, "ETHTOOL_GGRO");
+ if (ret == -1)
+ return -1;
+ if (ret)
+ return 1; /* generic (large) receive offloading on */
+#endif
+
+ return 0;
+}
+#else /* SIOCETHTOOL */
+static int
+iface_get_offload(pcap_t *handle _U_)
+{
+ /*
+ * XXX - do we need to get this information if we don't
+ * have the ethtool ioctls? If so, how do we do that?
+ */
+ return 0;
+}
+#endif /* SIOCETHTOOL */
+
#endif /* HAVE_PF_PACKET_SOCKETS */
/* ===== Functions to interface to the older kernels ================== */
if (handle->fd == -1) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"socket: %s", pcap_strerror(errno));
- return PCAP_ERROR_PERM_DENIED;
+ if (errno == EPERM || errno == EACCES) {
+ /*
+ * You don't have permission to open the
+ * socket.
+ */
+ return PCAP_ERROR_PERM_DENIED;
+ } else {
+ /*
+ * Other error.
+ */
+ return PCAP_ERROR;
+ }
}
/* It worked - we are using the old interface */
* Try to find the DLT_ type corresponding to that
* link-layer type.
*/
- map_arphrd_to_dlt(handle, arptype, 0);
+ map_arphrd_to_dlt(handle, handle->fd, arptype, device, 0);
if (handle->linktype == -1) {
snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
"unknown arptype %d", arptype);
*/
handle->offset = 0;
+ /*
+ * SOCK_PACKET sockets don't supply information from
+ * stripped VLAN tags.
+ */
+ handle->md.vlan_offset = -1; /* unknown */
+
return 1;
}
* header.
*/
p->k -= SLL_HDR_LEN;
+ } else if (p->k == 0) {
+ /*
+ * It's the packet type field; map it to the special magic
+ * kernel offset for that field.
+ */
+ p->k = SKF_AD_OFF + SKF_AD_PKTTYPE;
} else if (p->k == 14) {
/*
* It's the protocol field; map it to the special magic
* kernel offset for that field.
*/
p->k = SKF_AD_OFF + SKF_AD_PROTOCOL;
- } else {
+ } else if ((bpf_int32)(p->k) > 0) {
/*
* It's within the header, but it's not one of those
* fields; we can't do that in the kernel, so punt
projects / libpcap / blobdiff