/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2012 Daniel Borkmann.
 * Subject to the GPL, version 2.
 * Parts derived from iw, subject to ISC license.
 * Copyright 2007, 2008	Johannes Berg
 * Copyright 2007 Andy Lutomirski
 * Copyright 2007 Mike Kershaw
 * Copyright 2008-2009 Luis R. Rodriguez
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <sys/socket.h>
#include <linux/if.h>
#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>

#include "str.h"
#include "dev.h"
#include "mac80211.h"
#include "xmalloc.h"
#include "built_in.h"

struct nl80211_state {
	struct nl_sock *nl_sock;
	struct nl_cache *nl_cache;
	struct genl_family *nl80211;
};

static void get_mac80211_phydev(const char *device, char *phydev_path,
				size_t phydev_len)
{
	int ret;
	char *pathstr;
	ssize_t num;

	ret = asprintf(&pathstr, "/sys/class/net/%s/phy80211", device);
	if (ret < 0)
		panic("Can't generate path name string for /sys/class/net device");

	num = readlink(pathstr, phydev_path, phydev_len);
	if (num < 0) {
		if (errno == ENOENT || errno == EINVAL)
			panic("It's probably not a mac80211 device!\n");
		panic("Can't readlink %s: %s!\n", pathstr, strerror(errno));
	}

	xfree(pathstr);
	phydev_path[min_t(size_t, num, phydev_len - 1)] = 0;
}

static inline struct nl_msg *nl80211_nlmsg_xalloc(void)
{
	struct nl_msg *ret = nlmsg_alloc();
	if (!ret)
		panic("Cannot allocate nlmsg memory!\n");
	return ret;
}

static inline struct nl_sock *nl80211_nl_socket_xalloc(void)
{
	struct nl_sock *ret = nl_socket_alloc();
	if (!ret)
		panic("Cannot allocate nl socket memory!\n");
	return ret;
}

static void nl80211_init(struct nl80211_state *state)
{
	int ret;

	state->nl_sock = nl80211_nl_socket_xalloc();

	ret = genl_connect(state->nl_sock);
	if (ret)
		panic("Cannot connect generic netlink!\n");

	ret = genl_ctrl_alloc_cache(state->nl_sock, &state->nl_cache);
	if (ret < 0)
		panic("Failed to allocate generic netlink cache: %s!",
		      nl_geterror(-ret));

	state->nl80211 = genl_ctrl_search_by_name(state->nl_cache, "nl80211");
	if (!state->nl80211)
		panic("nl80211 not found in netlink cache!\n");
}

static void nl80211_cleanup(struct nl80211_state *state)
{
	genl_family_put(state->nl80211);

	nl_cache_free(state->nl_cache);
	nl_socket_free(state->nl_sock);
}

static int nl80211_wait_handler(struct nl_msg *msg __maybe_unused, void *arg)
{
	int *finished = arg;

	*finished = 1;

	return NL_STOP;
}

static int nl80211_error_handler(struct sockaddr_nl *nla __maybe_unused,
				 struct nlmsgerr *err,
				 void *arg __maybe_unused)
{
	panic("nl80211 returned with error (%d): %s\n", err->error,
	      nl_geterror(err->error));
}

static int nl80211_add_mon_if(struct nl80211_state *state, const char *device,
			      const char *mondevice)
{
	int ifindex, ret;
	struct nl_msg *msg;
	struct nl_cb *cb = NULL;
	int finished = 0;

	ifindex = device_ifindex(device);

	msg = nl80211_nlmsg_xalloc();

	genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0,
		    0, NL80211_CMD_NEW_INTERFACE, 0);

	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
	NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, mondevice);
	NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);

	ret = nl_send_auto_complete(state->nl_sock, msg);
	if (ret < 0) {
		if (ret == -ENFILE) {
			nlmsg_free(msg);
			return -EBUSY;
		}

		panic("Cannot send_auto_complete!\n");
	}

	cb = nl_cb_alloc(NL_CB_CUSTOM);
	if (!cb)
		panic("Cannot alloc nl_cb!\n");

	nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, nl80211_wait_handler, &finished);
	nl_cb_err(cb, NL_CB_CUSTOM, nl80211_error_handler, NULL);

	nl_recvmsgs(state->nl_sock, cb);

	if (!finished) {
		ret = nl_wait_for_ack(state->nl_sock);
		if (ret < 0) {
			if (ret == -ENFILE) {
				nlmsg_free(msg);
				return -EBUSY;
			}

			panic("Waiting for netlink ack failed!\n");
		}
	}

	nl_cb_put(cb);
	nlmsg_free(msg);
	return 0;

nla_put_failure:
	panic("nla put failure!\n");
	return -EIO; /* dummy */
}

static int nl80211_del_mon_if(struct nl80211_state *state,
			      const char *mondevice)
{
	int ifindex, ret;
	struct nl_msg *msg;

	ifindex = device_ifindex(mondevice);

	msg = nl80211_nlmsg_xalloc();

	genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0,
		    0, NL80211_CMD_DEL_INTERFACE, 0);

	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);

	ret = nl_send_auto_complete(state->nl_sock, msg);
	if (ret < 0)
		panic("Cannot send_auto_complete!\n");

	ret = nl_wait_for_ack(state->nl_sock);
	if (ret < 0)
		panic("Waiting for netlink ack failed!\n");

	nlmsg_free(msg);
	return 0;

nla_put_failure:
	panic("nla put failure!\n");
	return -EIO; /* dummy */
}

void enter_rfmon_mac80211(const char *device, char **mondev)
{
	int ret;
	short flags;
	uint32_t n;
	char phydev_path[256];
	struct nl80211_state nlstate;

	/* XXX: is this already a monN device? */
	get_mac80211_phydev(device, phydev_path, sizeof(phydev_path));
	nl80211_init(&nlstate);

	for (n = 0; n < UINT_MAX; n++) {
		char mondevice[32];

		slprintf(mondevice, sizeof(mondevice), "mon%u", n);

		if (__device_ifindex(mondevice) > 0)
			continue;

		ret = nl80211_add_mon_if(&nlstate, device, mondevice);
		if (ret == 0) {
			*mondev = xstrdup(mondevice);

			flags = device_get_flags(*mondev);
			flags |= IFF_UP | IFF_RUNNING;
			device_set_flags(*mondev, flags);

			nl80211_cleanup(&nlstate);
			return;
		}
	}

	panic("No free monN interfaces!\n");
}

void leave_rfmon_mac80211(const char *mondev)
{
	short flags;
	struct nl80211_state nlstate;

	flags = device_get_flags(mondev);
	flags &= ~(IFF_UP | IFF_RUNNING);
	device_set_flags(mondev, flags);

	nl80211_init(&nlstate);
	nl80211_del_mon_if(&nlstate, mondev);
	nl80211_cleanup(&nlstate);
}
b7431'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/oss/dev_table.h?id=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>1f3a8e49d8f28f498b8694464623ac20aebfe62a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/oss/dev_table.h?id=3ddc76dfc786cc6f87852693227fb0b1f124f807&amp;id2=1f3a8e49d8f28f498b8694464623ac20aebfe62a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</div><div class='commit-msg'>Pull timer type cleanups from Thomas Gleixner:
 "This series does a tree wide cleanup of types related to
  timers/timekeeping.

   - Get rid of cycles_t and use a plain u64. The type is not really
     helpful and caused more confusion than clarity

   - Get rid of the ktime union. The union has become useless as we use
     the scalar nanoseconds storage unconditionally now. The 32bit
     timespec alike storage got removed due to the Y2038 limitations
     some time ago.

     That leaves the odd union access around for no reason. Clean it up.

  Both changes have been done with coccinelle and a small amount of
  manual mopping up"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  ktime: Get rid of ktime_equal()
  ktime: Cleanup ktime_set() usage
  ktime: Get rid of the union
  clocksource: Use a plain u64 instead of cycle_t
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=3ddc76dfc786cc6f87852693227fb0b1f124f807'>Diffstat</a> (limited to 'sound/oss/dev_table.h')</div><table summary='diffstat' class='diffstat'>