/*
 * 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);
}
mit-subject'>PCI/MSI: Don't apply affinity if there aren't enough vectors left</div><div class='commit-msg'>Bart reported a problem wіth an out of bounds access in the low-level IRQ
affinity code, which we root caused to the qla2xxx driver assigning all its
MSI-X vectors to the pre and post vectors, and not having any left for the
actually spread IRQs.

Fix this issue by not asking for affinity assignment when there are no
vectors to assign left.

Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()")
Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com
Reported-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Tested-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>Diffstat</a> (limited to 'include/trace/events')</div><table summary='diffstat' class='diffstat'>had thought was
  fixed earlier turned out only to have been moved. So instead of being
  cleaver this change takes ucounts_lock with irqs disabled. So
  dec_ucount can be used from any context without fear of deadlock.

  The items accounted for dec_ucount and inc_ucount are all
  comparatively heavy weight objects so I don't exepct this will have
  any measurable performance impact"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  userns: Make ucounts lock irq-safe
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=19ca2c8fecb1592d623fe5e82d6796f8d446268d'>Diffstat</a> (limited to 'drivers/usb/renesas_usbhs/rcar2.h')</div><table summary='diffstat' class='diffstat'>