1089 lines
29 KiB
C
1089 lines
29 KiB
C
/*
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* This file implement the Wireless Extensions core API.
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*
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* Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
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* Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*
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* (As all part of the Linux kernel, this file is GPL)
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*/
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/wireless.h>
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#include <linux/uaccess.h>
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#include <linux/export.h>
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#include <net/cfg80211.h>
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#include <net/iw_handler.h>
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#include <net/netlink.h>
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#include <net/wext.h>
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#include <net/net_namespace.h>
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typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
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unsigned int, struct iw_request_info *,
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iw_handler);
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/*
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* Meta-data about all the standard Wireless Extension request we
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* know about.
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*/
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static const struct iw_ioctl_description standard_ioctl[] = {
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[IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[IW_IOCTL_IDX(SIOCGIWNAME)] = {
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.header_type = IW_HEADER_TYPE_CHAR,
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWNWID)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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.flags = IW_DESCR_FLAG_EVENT,
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},
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[IW_IOCTL_IDX(SIOCGIWNWID)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWFREQ)] = {
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.header_type = IW_HEADER_TYPE_FREQ,
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.flags = IW_DESCR_FLAG_EVENT,
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},
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[IW_IOCTL_IDX(SIOCGIWFREQ)] = {
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.header_type = IW_HEADER_TYPE_FREQ,
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWMODE)] = {
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.header_type = IW_HEADER_TYPE_UINT,
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.flags = IW_DESCR_FLAG_EVENT,
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},
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[IW_IOCTL_IDX(SIOCGIWMODE)] = {
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.header_type = IW_HEADER_TYPE_UINT,
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWSENS)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWSENS)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWRANGE)] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[IW_IOCTL_IDX(SIOCGIWRANGE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = sizeof(struct iw_range),
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWPRIV)] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = sizeof(struct iw_priv_args),
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.max_tokens = 16,
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.flags = IW_DESCR_FLAG_NOMAX,
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},
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[IW_IOCTL_IDX(SIOCSIWSTATS)] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = sizeof(struct iw_statistics),
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWSPY)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = sizeof(struct sockaddr),
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.max_tokens = IW_MAX_SPY,
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},
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[IW_IOCTL_IDX(SIOCGIWSPY)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = sizeof(struct sockaddr) +
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sizeof(struct iw_quality),
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.max_tokens = IW_MAX_SPY,
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},
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[IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = sizeof(struct iw_thrspy),
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.min_tokens = 1,
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.max_tokens = 1,
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},
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[IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = sizeof(struct iw_thrspy),
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.min_tokens = 1,
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.max_tokens = 1,
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},
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[IW_IOCTL_IDX(SIOCSIWAP)] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IW_IOCTL_IDX(SIOCGIWAP)] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWMLME)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.min_tokens = sizeof(struct iw_mlme),
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.max_tokens = sizeof(struct iw_mlme),
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},
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[IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = sizeof(struct sockaddr) +
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sizeof(struct iw_quality),
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.max_tokens = IW_MAX_AP,
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.flags = IW_DESCR_FLAG_NOMAX,
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},
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[IW_IOCTL_IDX(SIOCSIWSCAN)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.min_tokens = 0,
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.max_tokens = sizeof(struct iw_scan_req),
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},
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[IW_IOCTL_IDX(SIOCGIWSCAN)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_SCAN_MAX_DATA,
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.flags = IW_DESCR_FLAG_NOMAX,
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},
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[IW_IOCTL_IDX(SIOCSIWESSID)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_ESSID_MAX_SIZE,
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.flags = IW_DESCR_FLAG_EVENT,
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},
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[IW_IOCTL_IDX(SIOCGIWESSID)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_ESSID_MAX_SIZE,
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.flags = IW_DESCR_FLAG_DUMP,
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},
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[IW_IOCTL_IDX(SIOCSIWNICKN)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_ESSID_MAX_SIZE,
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},
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[IW_IOCTL_IDX(SIOCGIWNICKN)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_ESSID_MAX_SIZE,
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},
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[IW_IOCTL_IDX(SIOCSIWRATE)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWRATE)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWRTS)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWRTS)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWFRAG)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWFRAG)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWRETRY)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWRETRY)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWENCODE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_ENCODING_TOKEN_MAX,
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.flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
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},
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[IW_IOCTL_IDX(SIOCGIWENCODE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_ENCODING_TOKEN_MAX,
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.flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
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},
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[IW_IOCTL_IDX(SIOCSIWPOWER)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWPOWER)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWGENIE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_GENERIC_IE_MAX,
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},
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[IW_IOCTL_IDX(SIOCGIWGENIE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_GENERIC_IE_MAX,
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},
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[IW_IOCTL_IDX(SIOCSIWAUTH)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCGIWAUTH)] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.min_tokens = sizeof(struct iw_encode_ext),
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.max_tokens = sizeof(struct iw_encode_ext) +
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IW_ENCODING_TOKEN_MAX,
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},
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[IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.min_tokens = sizeof(struct iw_encode_ext),
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.max_tokens = sizeof(struct iw_encode_ext) +
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IW_ENCODING_TOKEN_MAX,
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},
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[IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.min_tokens = sizeof(struct iw_pmksa),
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.max_tokens = sizeof(struct iw_pmksa),
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},
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};
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static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
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/*
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* Meta-data about all the additional standard Wireless Extension events
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* we know about.
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*/
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static const struct iw_ioctl_description standard_event[] = {
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[IW_EVENT_IDX(IWEVTXDROP)] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IW_EVENT_IDX(IWEVQUAL)] = {
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.header_type = IW_HEADER_TYPE_QUAL,
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},
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[IW_EVENT_IDX(IWEVCUSTOM)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_CUSTOM_MAX,
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},
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[IW_EVENT_IDX(IWEVREGISTERED)] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IW_EVENT_IDX(IWEVEXPIRED)] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IW_EVENT_IDX(IWEVGENIE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_GENERIC_IE_MAX,
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},
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[IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = sizeof(struct iw_michaelmicfailure),
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},
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[IW_EVENT_IDX(IWEVASSOCREQIE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_GENERIC_IE_MAX,
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},
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[IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = IW_GENERIC_IE_MAX,
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},
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[IW_EVENT_IDX(IWEVPMKIDCAND)] = {
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.header_type = IW_HEADER_TYPE_POINT,
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.token_size = 1,
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.max_tokens = sizeof(struct iw_pmkid_cand),
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},
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};
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static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
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/* Size (in bytes) of various events */
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static const int event_type_size[] = {
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IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
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0,
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IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
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0,
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IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
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IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
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IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
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0,
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IW_EV_POINT_LEN, /* Without variable payload */
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IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
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IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
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};
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#ifdef CONFIG_COMPAT
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static const int compat_event_type_size[] = {
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IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
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0,
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IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
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0,
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IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
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IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
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IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
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0,
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IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
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IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
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IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
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};
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#endif
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/* IW event code */
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static int __net_init wext_pernet_init(struct net *net)
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{
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skb_queue_head_init(&net->wext_nlevents);
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return 0;
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}
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static void __net_exit wext_pernet_exit(struct net *net)
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{
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skb_queue_purge(&net->wext_nlevents);
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}
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static struct pernet_operations wext_pernet_ops = {
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.init = wext_pernet_init,
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.exit = wext_pernet_exit,
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};
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static int __init wireless_nlevent_init(void)
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{
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return register_pernet_subsys(&wext_pernet_ops);
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}
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subsys_initcall(wireless_nlevent_init);
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/* Process events generated by the wireless layer or the driver. */
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static void wireless_nlevent_process(struct work_struct *work)
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{
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struct sk_buff *skb;
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struct net *net;
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rtnl_lock();
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for_each_net(net) {
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while ((skb = skb_dequeue(&net->wext_nlevents)))
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rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
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GFP_KERNEL);
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}
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rtnl_unlock();
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}
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static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
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|
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static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
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struct sk_buff *skb)
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{
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struct ifinfomsg *r;
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struct nlmsghdr *nlh;
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nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
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if (!nlh)
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return NULL;
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r = nlmsg_data(nlh);
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r->ifi_family = AF_UNSPEC;
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r->__ifi_pad = 0;
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r->ifi_type = dev->type;
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r->ifi_index = dev->ifindex;
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r->ifi_flags = dev_get_flags(dev);
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r->ifi_change = 0; /* Wireless changes don't affect those flags */
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if (nla_put_string(skb, IFLA_IFNAME, dev->name))
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goto nla_put_failure;
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return nlh;
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nla_put_failure:
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nlmsg_cancel(skb, nlh);
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return NULL;
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}
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|
|
|
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/*
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* Main event dispatcher. Called from other parts and drivers.
|
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* Send the event on the appropriate channels.
|
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* May be called from interrupt context.
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*/
|
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void wireless_send_event(struct net_device * dev,
|
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unsigned int cmd,
|
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union iwreq_data * wrqu,
|
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const char * extra)
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{
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const struct iw_ioctl_description * descr = NULL;
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int extra_len = 0;
|
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struct iw_event *event; /* Mallocated whole event */
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int event_len; /* Its size */
|
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int hdr_len; /* Size of the event header */
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int wrqu_off = 0; /* Offset in wrqu */
|
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/* Don't "optimise" the following variable, it will crash */
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unsigned int cmd_index; /* *MUST* be unsigned */
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struct sk_buff *skb;
|
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struct nlmsghdr *nlh;
|
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struct nlattr *nla;
|
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#ifdef CONFIG_COMPAT
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struct __compat_iw_event *compat_event;
|
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struct compat_iw_point compat_wrqu;
|
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struct sk_buff *compskb;
|
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#endif
|
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|
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/*
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* Nothing in the kernel sends scan events with data, be safe.
|
|
* This is necessary because we cannot fix up scan event data
|
|
* for compat, due to being contained in 'extra', but normally
|
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* applications are required to retrieve the scan data anyway
|
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* and no data is included in the event, this codifies that
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* practice.
|
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*/
|
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if (WARN_ON(cmd == SIOCGIWSCAN && extra))
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|
extra = NULL;
|
|
|
|
/* Get the description of the Event */
|
|
if (cmd <= SIOCIWLAST) {
|
|
cmd_index = IW_IOCTL_IDX(cmd);
|
|
if (cmd_index < standard_ioctl_num)
|
|
descr = &(standard_ioctl[cmd_index]);
|
|
} else {
|
|
cmd_index = IW_EVENT_IDX(cmd);
|
|
if (cmd_index < standard_event_num)
|
|
descr = &(standard_event[cmd_index]);
|
|
}
|
|
/* Don't accept unknown events */
|
|
if (descr == NULL) {
|
|
/* Note : we don't return an error to the driver, because
|
|
* the driver would not know what to do about it. It can't
|
|
* return an error to the user, because the event is not
|
|
* initiated by a user request.
|
|
* The best the driver could do is to log an error message.
|
|
* We will do it ourselves instead...
|
|
*/
|
|
netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
|
|
cmd);
|
|
return;
|
|
}
|
|
|
|
/* Check extra parameters and set extra_len */
|
|
if (descr->header_type == IW_HEADER_TYPE_POINT) {
|
|
/* Check if number of token fits within bounds */
|
|
if (wrqu->data.length > descr->max_tokens) {
|
|
netdev_err(dev, "(WE) : Wireless Event too big (%d)\n",
|
|
wrqu->data.length);
|
|
return;
|
|
}
|
|
if (wrqu->data.length < descr->min_tokens) {
|
|
netdev_err(dev, "(WE) : Wireless Event too small (%d)\n",
|
|
wrqu->data.length);
|
|
return;
|
|
}
|
|
/* Calculate extra_len - extra is NULL for restricted events */
|
|
if (extra != NULL)
|
|
extra_len = wrqu->data.length * descr->token_size;
|
|
/* Always at an offset in wrqu */
|
|
wrqu_off = IW_EV_POINT_OFF;
|
|
}
|
|
|
|
/* Total length of the event */
|
|
hdr_len = event_type_size[descr->header_type];
|
|
event_len = hdr_len + extra_len;
|
|
|
|
/*
|
|
* The problem for 64/32 bit.
|
|
*
|
|
* On 64-bit, a regular event is laid out as follows:
|
|
* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|
|
* | event.len | event.cmd | p a d d i n g |
|
|
* | wrqu data ... (with the correct size) |
|
|
*
|
|
* This padding exists because we manipulate event->u,
|
|
* and 'event' is not packed.
|
|
*
|
|
* An iw_point event is laid out like this instead:
|
|
* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|
|
* | event.len | event.cmd | p a d d i n g |
|
|
* | iwpnt.len | iwpnt.flg | p a d d i n g |
|
|
* | extra data ...
|
|
*
|
|
* The second padding exists because struct iw_point is extended,
|
|
* but this depends on the platform...
|
|
*
|
|
* On 32-bit, all the padding shouldn't be there.
|
|
*/
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
/* Send via the RtNetlink event channel */
|
|
nlh = rtnetlink_ifinfo_prep(dev, skb);
|
|
if (WARN_ON(!nlh)) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
/* Add the wireless events in the netlink packet */
|
|
nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
|
|
if (!nla) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
event = nla_data(nla);
|
|
|
|
/* Fill event - first clear to avoid data leaking */
|
|
memset(event, 0, hdr_len);
|
|
event->len = event_len;
|
|
event->cmd = cmd;
|
|
memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
|
|
if (extra_len)
|
|
memcpy(((char *) event) + hdr_len, extra, extra_len);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
#ifdef CONFIG_COMPAT
|
|
hdr_len = compat_event_type_size[descr->header_type];
|
|
event_len = hdr_len + extra_len;
|
|
|
|
compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!compskb) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
/* Send via the RtNetlink event channel */
|
|
nlh = rtnetlink_ifinfo_prep(dev, compskb);
|
|
if (WARN_ON(!nlh)) {
|
|
kfree_skb(skb);
|
|
kfree_skb(compskb);
|
|
return;
|
|
}
|
|
|
|
/* Add the wireless events in the netlink packet */
|
|
nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
|
|
if (!nla) {
|
|
kfree_skb(skb);
|
|
kfree_skb(compskb);
|
|
return;
|
|
}
|
|
compat_event = nla_data(nla);
|
|
|
|
compat_event->len = event_len;
|
|
compat_event->cmd = cmd;
|
|
if (descr->header_type == IW_HEADER_TYPE_POINT) {
|
|
compat_wrqu.length = wrqu->data.length;
|
|
compat_wrqu.flags = wrqu->data.flags;
|
|
memcpy(&compat_event->pointer,
|
|
((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
|
|
hdr_len - IW_EV_COMPAT_LCP_LEN);
|
|
if (extra_len)
|
|
memcpy(((char *) compat_event) + hdr_len,
|
|
extra, extra_len);
|
|
} else {
|
|
/* extra_len must be zero, so no if (extra) needed */
|
|
memcpy(&compat_event->pointer, wrqu,
|
|
hdr_len - IW_EV_COMPAT_LCP_LEN);
|
|
}
|
|
|
|
nlmsg_end(compskb, nlh);
|
|
|
|
skb_shinfo(skb)->frag_list = compskb;
|
|
#endif
|
|
skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
|
|
schedule_work(&wireless_nlevent_work);
|
|
}
|
|
EXPORT_SYMBOL(wireless_send_event);
|
|
|
|
|
|
|
|
/* IW handlers */
|
|
|
|
struct iw_statistics *get_wireless_stats(struct net_device *dev)
|
|
{
|
|
#ifdef CONFIG_WIRELESS_EXT
|
|
if ((dev->wireless_handlers != NULL) &&
|
|
(dev->wireless_handlers->get_wireless_stats != NULL))
|
|
return dev->wireless_handlers->get_wireless_stats(dev);
|
|
#endif
|
|
|
|
#ifdef CONFIG_CFG80211_WEXT
|
|
if (dev->ieee80211_ptr &&
|
|
dev->ieee80211_ptr->wiphy &&
|
|
dev->ieee80211_ptr->wiphy->wext &&
|
|
dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
|
|
return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
|
|
#endif
|
|
|
|
/* not found */
|
|
return NULL;
|
|
}
|
|
|
|
static int iw_handler_get_iwstats(struct net_device * dev,
|
|
struct iw_request_info * info,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
/* Get stats from the driver */
|
|
struct iw_statistics *stats;
|
|
|
|
stats = get_wireless_stats(dev);
|
|
if (stats) {
|
|
/* Copy statistics to extra */
|
|
memcpy(extra, stats, sizeof(struct iw_statistics));
|
|
wrqu->data.length = sizeof(struct iw_statistics);
|
|
|
|
/* Check if we need to clear the updated flag */
|
|
if (wrqu->data.flags != 0)
|
|
stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
|
|
return 0;
|
|
} else
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
|
|
{
|
|
/* Don't "optimise" the following variable, it will crash */
|
|
unsigned int index; /* *MUST* be unsigned */
|
|
const struct iw_handler_def *handlers = NULL;
|
|
|
|
#ifdef CONFIG_CFG80211_WEXT
|
|
if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
|
|
handlers = dev->ieee80211_ptr->wiphy->wext;
|
|
#endif
|
|
#ifdef CONFIG_WIRELESS_EXT
|
|
if (dev->wireless_handlers)
|
|
handlers = dev->wireless_handlers;
|
|
#endif
|
|
|
|
if (!handlers)
|
|
return NULL;
|
|
|
|
/* Try as a standard command */
|
|
index = IW_IOCTL_IDX(cmd);
|
|
if (index < handlers->num_standard)
|
|
return handlers->standard[index];
|
|
|
|
#ifdef CONFIG_WEXT_PRIV
|
|
/* Try as a private command */
|
|
index = cmd - SIOCIWFIRSTPRIV;
|
|
if (index < handlers->num_private)
|
|
return handlers->private[index];
|
|
#endif
|
|
|
|
/* Not found */
|
|
return NULL;
|
|
}
|
|
|
|
static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
|
|
const struct iw_ioctl_description *descr,
|
|
iw_handler handler, struct net_device *dev,
|
|
struct iw_request_info *info)
|
|
{
|
|
int err, extra_size, user_length = 0, essid_compat = 0;
|
|
char *extra;
|
|
|
|
/* Calculate space needed by arguments. Always allocate
|
|
* for max space.
|
|
*/
|
|
extra_size = descr->max_tokens * descr->token_size;
|
|
|
|
/* Check need for ESSID compatibility for WE < 21 */
|
|
switch (cmd) {
|
|
case SIOCSIWESSID:
|
|
case SIOCGIWESSID:
|
|
case SIOCSIWNICKN:
|
|
case SIOCGIWNICKN:
|
|
if (iwp->length == descr->max_tokens + 1)
|
|
essid_compat = 1;
|
|
else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
|
|
char essid[IW_ESSID_MAX_SIZE + 1];
|
|
unsigned int len;
|
|
len = iwp->length * descr->token_size;
|
|
|
|
if (len > IW_ESSID_MAX_SIZE)
|
|
return -EFAULT;
|
|
|
|
err = copy_from_user(essid, iwp->pointer, len);
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
if (essid[iwp->length - 1] == '\0')
|
|
essid_compat = 1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
iwp->length -= essid_compat;
|
|
|
|
/* Check what user space is giving us */
|
|
if (IW_IS_SET(cmd)) {
|
|
/* Check NULL pointer */
|
|
if (!iwp->pointer && iwp->length != 0)
|
|
return -EFAULT;
|
|
/* Check if number of token fits within bounds */
|
|
if (iwp->length > descr->max_tokens)
|
|
return -E2BIG;
|
|
if (iwp->length < descr->min_tokens)
|
|
return -EINVAL;
|
|
} else {
|
|
/* Check NULL pointer */
|
|
if (!iwp->pointer)
|
|
return -EFAULT;
|
|
/* Save user space buffer size for checking */
|
|
user_length = iwp->length;
|
|
|
|
/* Don't check if user_length > max to allow forward
|
|
* compatibility. The test user_length < min is
|
|
* implied by the test at the end.
|
|
*/
|
|
|
|
/* Support for very large requests */
|
|
if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
|
|
(user_length > descr->max_tokens)) {
|
|
/* Allow userspace to GET more than max so
|
|
* we can support any size GET requests.
|
|
* There is still a limit : -ENOMEM.
|
|
*/
|
|
extra_size = user_length * descr->token_size;
|
|
|
|
/* Note : user_length is originally a __u16,
|
|
* and token_size is controlled by us,
|
|
* so extra_size won't get negative and
|
|
* won't overflow...
|
|
*/
|
|
}
|
|
}
|
|
|
|
/* kzalloc() ensures NULL-termination for essid_compat. */
|
|
extra = kzalloc(extra_size, GFP_KERNEL);
|
|
if (!extra)
|
|
return -ENOMEM;
|
|
|
|
/* If it is a SET, get all the extra data in here */
|
|
if (IW_IS_SET(cmd) && (iwp->length != 0)) {
|
|
if (copy_from_user(extra, iwp->pointer,
|
|
iwp->length *
|
|
descr->token_size)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (cmd == SIOCSIWENCODEEXT) {
|
|
struct iw_encode_ext *ee = (void *) extra;
|
|
|
|
if (iwp->length < sizeof(*ee) + ee->key_len) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
|
|
/*
|
|
* If this is a GET, but not NOMAX, it means that the extra
|
|
* data is not bounded by userspace, but by max_tokens. Thus
|
|
* set the length to max_tokens. This matches the extra data
|
|
* allocation.
|
|
* The driver should fill it with the number of tokens it
|
|
* provided, and it may check iwp->length rather than having
|
|
* knowledge of max_tokens. If the driver doesn't change the
|
|
* iwp->length, this ioctl just copies back max_token tokens
|
|
* filled with zeroes. Hopefully the driver isn't claiming
|
|
* them to be valid data.
|
|
*/
|
|
iwp->length = descr->max_tokens;
|
|
}
|
|
|
|
err = handler(dev, info, (union iwreq_data *) iwp, extra);
|
|
|
|
iwp->length += essid_compat;
|
|
|
|
/* If we have something to return to the user */
|
|
if (!err && IW_IS_GET(cmd)) {
|
|
/* Check if there is enough buffer up there */
|
|
if (user_length < iwp->length) {
|
|
err = -E2BIG;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_to_user(iwp->pointer, extra,
|
|
iwp->length *
|
|
descr->token_size)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Generate an event to notify listeners of the change */
|
|
if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
|
|
((err == 0) || (err == -EIWCOMMIT))) {
|
|
union iwreq_data *data = (union iwreq_data *) iwp;
|
|
|
|
if (descr->flags & IW_DESCR_FLAG_RESTRICT)
|
|
/* If the event is restricted, don't
|
|
* export the payload.
|
|
*/
|
|
wireless_send_event(dev, cmd, data, NULL);
|
|
else
|
|
wireless_send_event(dev, cmd, data, extra);
|
|
}
|
|
|
|
out:
|
|
kfree(extra);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Call the commit handler in the driver
|
|
* (if exist and if conditions are right)
|
|
*
|
|
* Note : our current commit strategy is currently pretty dumb,
|
|
* but we will be able to improve on that...
|
|
* The goal is to try to agreagate as many changes as possible
|
|
* before doing the commit. Drivers that will define a commit handler
|
|
* are usually those that need a reset after changing parameters, so
|
|
* we want to minimise the number of reset.
|
|
* A cool idea is to use a timer : at each "set" command, we re-set the
|
|
* timer, when the timer eventually fires, we call the driver.
|
|
* Hopefully, more on that later.
|
|
*
|
|
* Also, I'm waiting to see how many people will complain about the
|
|
* netif_running(dev) test. I'm open on that one...
|
|
* Hopefully, the driver will remember to do a commit in "open()" ;-)
|
|
*/
|
|
int call_commit_handler(struct net_device *dev)
|
|
{
|
|
#ifdef CONFIG_WIRELESS_EXT
|
|
if ((netif_running(dev)) &&
|
|
(dev->wireless_handlers->standard[0] != NULL))
|
|
/* Call the commit handler on the driver */
|
|
return dev->wireless_handlers->standard[0](dev, NULL,
|
|
NULL, NULL);
|
|
else
|
|
return 0; /* Command completed successfully */
|
|
#else
|
|
/* cfg80211 has no commit */
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Main IOCTl dispatcher.
|
|
* Check the type of IOCTL and call the appropriate wrapper...
|
|
*/
|
|
static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
|
|
unsigned int cmd,
|
|
struct iw_request_info *info,
|
|
wext_ioctl_func standard,
|
|
wext_ioctl_func private)
|
|
{
|
|
struct iwreq *iwr = (struct iwreq *) ifr;
|
|
struct net_device *dev;
|
|
iw_handler handler;
|
|
|
|
/* Permissions are already checked in dev_ioctl() before calling us.
|
|
* The copy_to/from_user() of ifr is also dealt with in there */
|
|
|
|
/* Make sure the device exist */
|
|
if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
|
|
return -ENODEV;
|
|
|
|
/* A bunch of special cases, then the generic case...
|
|
* Note that 'cmd' is already filtered in dev_ioctl() with
|
|
* (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
|
|
if (cmd == SIOCGIWSTATS)
|
|
return standard(dev, iwr, cmd, info,
|
|
&iw_handler_get_iwstats);
|
|
|
|
#ifdef CONFIG_WEXT_PRIV
|
|
if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
|
|
return standard(dev, iwr, cmd, info,
|
|
iw_handler_get_private);
|
|
#endif
|
|
|
|
/* Basic check */
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
/* New driver API : try to find the handler */
|
|
handler = get_handler(dev, cmd);
|
|
if (handler) {
|
|
/* Standard and private are not the same */
|
|
if (cmd < SIOCIWFIRSTPRIV)
|
|
return standard(dev, iwr, cmd, info, handler);
|
|
else if (private)
|
|
return private(dev, iwr, cmd, info, handler);
|
|
}
|
|
/* Old driver API : call driver ioctl handler */
|
|
if (dev->netdev_ops->ndo_do_ioctl)
|
|
return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/* If command is `set a parameter', or `get the encoding parameters',
|
|
* check if the user has the right to do it.
|
|
*/
|
|
static int wext_permission_check(unsigned int cmd)
|
|
{
|
|
if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
|
|
cmd == SIOCGIWENCODEEXT) &&
|
|
!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* entry point from dev ioctl */
|
|
static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
|
|
unsigned int cmd, struct iw_request_info *info,
|
|
wext_ioctl_func standard,
|
|
wext_ioctl_func private)
|
|
{
|
|
int ret = wext_permission_check(cmd);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
dev_load(net, ifr->ifr_name);
|
|
rtnl_lock();
|
|
ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
|
|
rtnl_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Wrapper to call a standard Wireless Extension handler.
|
|
* We do various checks and also take care of moving data between
|
|
* user space and kernel space.
|
|
*/
|
|
static int ioctl_standard_call(struct net_device * dev,
|
|
struct iwreq *iwr,
|
|
unsigned int cmd,
|
|
struct iw_request_info *info,
|
|
iw_handler handler)
|
|
{
|
|
const struct iw_ioctl_description * descr;
|
|
int ret = -EINVAL;
|
|
|
|
/* Get the description of the IOCTL */
|
|
if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
|
|
return -EOPNOTSUPP;
|
|
descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
|
|
|
|
/* Check if we have a pointer to user space data or not */
|
|
if (descr->header_type != IW_HEADER_TYPE_POINT) {
|
|
|
|
/* No extra arguments. Trivial to handle */
|
|
ret = handler(dev, info, &(iwr->u), NULL);
|
|
|
|
/* Generate an event to notify listeners of the change */
|
|
if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
|
|
((ret == 0) || (ret == -EIWCOMMIT)))
|
|
wireless_send_event(dev, cmd, &(iwr->u), NULL);
|
|
} else {
|
|
ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
|
|
handler, dev, info);
|
|
}
|
|
|
|
/* Call commit handler if needed and defined */
|
|
if (ret == -EIWCOMMIT)
|
|
ret = call_commit_handler(dev);
|
|
|
|
/* Here, we will generate the appropriate event if needed */
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
|
|
void __user *arg)
|
|
{
|
|
struct iw_request_info info = { .cmd = cmd, .flags = 0 };
|
|
int ret;
|
|
|
|
ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
|
|
ioctl_standard_call,
|
|
ioctl_private_call);
|
|
if (ret >= 0 &&
|
|
IW_IS_GET(cmd) &&
|
|
copy_to_user(arg, ifr, sizeof(struct iwreq)))
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_standard_call(struct net_device *dev,
|
|
struct iwreq *iwr,
|
|
unsigned int cmd,
|
|
struct iw_request_info *info,
|
|
iw_handler handler)
|
|
{
|
|
const struct iw_ioctl_description *descr;
|
|
struct compat_iw_point *iwp_compat;
|
|
struct iw_point iwp;
|
|
int err;
|
|
|
|
descr = standard_ioctl + IW_IOCTL_IDX(cmd);
|
|
|
|
if (descr->header_type != IW_HEADER_TYPE_POINT)
|
|
return ioctl_standard_call(dev, iwr, cmd, info, handler);
|
|
|
|
iwp_compat = (struct compat_iw_point *) &iwr->u.data;
|
|
iwp.pointer = compat_ptr(iwp_compat->pointer);
|
|
iwp.length = iwp_compat->length;
|
|
iwp.flags = iwp_compat->flags;
|
|
|
|
err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
|
|
|
|
iwp_compat->pointer = ptr_to_compat(iwp.pointer);
|
|
iwp_compat->length = iwp.length;
|
|
iwp_compat->flags = iwp.flags;
|
|
|
|
return err;
|
|
}
|
|
|
|
int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
struct iw_request_info info;
|
|
struct iwreq iwr;
|
|
char *colon;
|
|
int ret;
|
|
|
|
if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
|
|
return -EFAULT;
|
|
|
|
iwr.ifr_name[IFNAMSIZ-1] = 0;
|
|
colon = strchr(iwr.ifr_name, ':');
|
|
if (colon)
|
|
*colon = 0;
|
|
|
|
info.cmd = cmd;
|
|
info.flags = IW_REQUEST_FLAG_COMPAT;
|
|
|
|
ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
|
|
compat_standard_call,
|
|
compat_private_call);
|
|
|
|
if (ret >= 0 &&
|
|
IW_IS_GET(cmd) &&
|
|
copy_to_user(argp, &iwr, sizeof(struct iwreq)))
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
}
|
|
#endif
|