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![Jamal Hadi Salim](/assets/img/avatar_default.png)
In the minimal the wireless extensions oughta send at least the name in addition to the ifindex. Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Signed-off-by: David S. Miller <davem@davemloft.net>
1650 lines
47 KiB
C
1650 lines
47 KiB
C
/*
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* This file implement the Wireless Extensions APIs.
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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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*
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* (As all part of the Linux kernel, this file is GPL)
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*/
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/************************** DOCUMENTATION **************************/
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/*
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* API definition :
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* --------------
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* See <linux/wireless.h> for details of the APIs and the rest.
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*
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* History :
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* -------
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*
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* v1 - 5.12.01 - Jean II
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* o Created this file.
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*
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* v2 - 13.12.01 - Jean II
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* o Move /proc/net/wireless stuff from net/core/dev.c to here
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* o Make Wireless Extension IOCTLs go through here
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* o Added iw_handler handling ;-)
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* o Added standard ioctl description
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* o Initial dumb commit strategy based on orinoco.c
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*
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* v3 - 19.12.01 - Jean II
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* o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call
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* o Add event dispatcher function
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* o Add event description
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* o Propagate events as rtnetlink IFLA_WIRELESS option
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* o Generate event on selected SET requests
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*
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* v4 - 18.04.02 - Jean II
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* o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
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*
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* v5 - 21.06.02 - Jean II
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* o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup)
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* o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes
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* o Add IWEVCUSTOM for driver specific event/scanning token
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* o Turn on WE_STRICT_WRITE by default + kernel warning
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* o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num)
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* o Fix off-by-one in test (extra_size <= IFNAMSIZ)
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*
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* v6 - 9.01.03 - Jean II
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* o Add common spy support : iw_handler_set_spy(), wireless_spy_update()
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* o Add enhanced spy support : iw_handler_set_thrspy() and event.
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* o Add WIRELESS_EXT version display in /proc/net/wireless
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*
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* v6 - 18.06.04 - Jean II
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* o Change get_spydata() method for added safety
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* o Remove spy #ifdef, they are always on -> cleaner code
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* o Allow any size GET request if user specifies length > max
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* and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV
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* o Start migrating get_wireless_stats to struct iw_handler_def
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* o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus
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* Based on patch from Pavel Roskin <proski@gnu.org> :
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* o Fix kernel data leak to user space in private handler handling
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*
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* v7 - 18.3.05 - Jean II
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* o Remove (struct iw_point *)->pointer from events and streams
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* o Remove spy_offset from struct iw_handler_def
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* o Start deprecating dev->get_wireless_stats, output a warning
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* o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
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* o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
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*
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* v8 - 17.02.06 - Jean II
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* o RtNetlink requests support (SET/GET)
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*
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* v8b - 03.08.06 - Herbert Xu
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* o Fix Wireless Event locking issues.
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*
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* v9 - 14.3.06 - Jean II
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* o Change length in ESSID and NICK to strlen() instead of strlen()+1
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* o Make standard_ioctl_num and standard_event_num unsigned
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* o Remove (struct net_device *)->get_wireless_stats()
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*
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* v10 - 16.3.07 - Jean II
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* o Prevent leaking of kernel space in stream on 64 bits.
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*/
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/***************************** INCLUDES *****************************/
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#include <linux/module.h>
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#include <linux/types.h> /* off_t */
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#include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
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#include <linux/proc_fs.h>
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#include <linux/rtnetlink.h> /* rtnetlink stuff */
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#include <linux/seq_file.h>
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#include <linux/init.h> /* for __init */
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#include <linux/if_arp.h> /* ARPHRD_ETHER */
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#include <linux/etherdevice.h> /* compare_ether_addr */
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#include <linux/interrupt.h>
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#include <net/net_namespace.h>
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#include <linux/wireless.h> /* Pretty obvious */
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#include <net/iw_handler.h> /* New driver API */
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#include <net/netlink.h>
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#include <net/wext.h>
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#include <asm/uaccess.h> /* copy_to_user() */
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/************************* GLOBAL VARIABLES *************************/
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/*
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* You should not use global variables, because of re-entrancy.
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* On our case, it's only const, so it's OK...
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*/
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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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[SIOCSIWCOMMIT - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[SIOCGIWNAME - SIOCIWFIRST] = {
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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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[SIOCSIWNWID - SIOCIWFIRST] = {
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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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[SIOCGIWNWID - SIOCIWFIRST] = {
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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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[SIOCSIWFREQ - SIOCIWFIRST] = {
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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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[SIOCGIWFREQ - SIOCIWFIRST] = {
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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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[SIOCSIWMODE - SIOCIWFIRST] = {
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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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[SIOCGIWMODE - SIOCIWFIRST] = {
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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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[SIOCSIWSENS - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWSENS - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWRANGE - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[SIOCGIWRANGE - SIOCIWFIRST] = {
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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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[SIOCSIWPRIV - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[SIOCGIWPRIV - SIOCIWFIRST] = { /* (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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[SIOCSIWSTATS - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_NULL,
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},
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[SIOCGIWSTATS - SIOCIWFIRST] = { /* (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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[SIOCSIWSPY - SIOCIWFIRST] = {
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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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[SIOCGIWSPY - SIOCIWFIRST] = {
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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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[SIOCSIWTHRSPY - SIOCIWFIRST] = {
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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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[SIOCGIWTHRSPY - SIOCIWFIRST] = {
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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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[SIOCSIWAP - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[SIOCGIWAP - SIOCIWFIRST] = {
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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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[SIOCSIWMLME - SIOCIWFIRST] = {
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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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[SIOCGIWAPLIST - SIOCIWFIRST] = {
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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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[SIOCSIWSCAN - SIOCIWFIRST] = {
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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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[SIOCGIWSCAN - SIOCIWFIRST] = {
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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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[SIOCSIWESSID - SIOCIWFIRST] = {
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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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[SIOCGIWESSID - SIOCIWFIRST] = {
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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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[SIOCSIWNICKN - SIOCIWFIRST] = {
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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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[SIOCGIWNICKN - SIOCIWFIRST] = {
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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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[SIOCSIWRATE - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWRATE - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWRTS - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWRTS - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWFRAG - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWFRAG - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWTXPOW - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWTXPOW - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWRETRY - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWRETRY - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWENCODE - SIOCIWFIRST] = {
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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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[SIOCGIWENCODE - SIOCIWFIRST] = {
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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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[SIOCSIWPOWER - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWPOWER - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWGENIE - SIOCIWFIRST] = {
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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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[SIOCGIWGENIE - SIOCIWFIRST] = {
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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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[SIOCSIWAUTH - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCGIWAUTH - SIOCIWFIRST] = {
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.header_type = IW_HEADER_TYPE_PARAM,
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},
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[SIOCSIWENCODEEXT - SIOCIWFIRST] = {
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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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[SIOCGIWENCODEEXT - SIOCIWFIRST] = {
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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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[SIOCSIWPMKSA - SIOCIWFIRST] = {
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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 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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[IWEVTXDROP - IWEVFIRST] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IWEVQUAL - IWEVFIRST] = {
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.header_type = IW_HEADER_TYPE_QUAL,
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},
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[IWEVCUSTOM - IWEVFIRST] = {
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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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[IWEVREGISTERED - IWEVFIRST] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IWEVEXPIRED - IWEVFIRST] = {
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.header_type = IW_HEADER_TYPE_ADDR,
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},
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[IWEVGENIE - IWEVFIRST] = {
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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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[IWEVMICHAELMICFAILURE - IWEVFIRST] = {
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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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[IWEVASSOCREQIE - IWEVFIRST] = {
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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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[IWEVASSOCRESPIE - IWEVFIRST] = {
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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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[IWEVPMKIDCAND - IWEVFIRST] = {
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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 standard_event_num = ARRAY_SIZE(standard_event);
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/* Size (in bytes) of the various private data types */
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static const char iw_priv_type_size[] = {
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0, /* IW_PRIV_TYPE_NONE */
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1, /* IW_PRIV_TYPE_BYTE */
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1, /* IW_PRIV_TYPE_CHAR */
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0, /* Not defined */
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sizeof(__u32), /* IW_PRIV_TYPE_INT */
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sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
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sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
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0, /* Not defined */
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};
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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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/************************ COMMON SUBROUTINES ************************/
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/*
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* Stuff that may be used in various place or doesn't fit in one
|
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* of the section below.
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*/
|
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|
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/* ---------------------------------------------------------------- */
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/*
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* Return the driver handler associated with a specific Wireless Extension.
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*/
|
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static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
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{
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/* Don't "optimise" the following variable, it will crash */
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|
unsigned int index; /* *MUST* be unsigned */
|
|
|
|
/* Check if we have some wireless handlers defined */
|
|
if (dev->wireless_handlers == NULL)
|
|
return NULL;
|
|
|
|
/* Try as a standard command */
|
|
index = cmd - SIOCIWFIRST;
|
|
if (index < dev->wireless_handlers->num_standard)
|
|
return dev->wireless_handlers->standard[index];
|
|
|
|
/* Try as a private command */
|
|
index = cmd - SIOCIWFIRSTPRIV;
|
|
if (index < dev->wireless_handlers->num_private)
|
|
return dev->wireless_handlers->private[index];
|
|
|
|
/* Not found */
|
|
return NULL;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Get statistics out of the driver
|
|
*/
|
|
static struct iw_statistics *get_wireless_stats(struct net_device *dev)
|
|
{
|
|
/* New location */
|
|
if ((dev->wireless_handlers != NULL) &&
|
|
(dev->wireless_handlers->get_wireless_stats != NULL))
|
|
return dev->wireless_handlers->get_wireless_stats(dev);
|
|
|
|
/* Not found */
|
|
return NULL;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* 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()" ;-)
|
|
*/
|
|
static int call_commit_handler(struct net_device *dev)
|
|
{
|
|
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 */
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Calculate size of private arguments
|
|
*/
|
|
static int get_priv_size(__u16 args)
|
|
{
|
|
int num = args & IW_PRIV_SIZE_MASK;
|
|
int type = (args & IW_PRIV_TYPE_MASK) >> 12;
|
|
|
|
return num * iw_priv_type_size[type];
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Re-calculate the size of private arguments
|
|
*/
|
|
static int adjust_priv_size(__u16 args, struct iw_point *iwp)
|
|
{
|
|
int num = iwp->length;
|
|
int max = args & IW_PRIV_SIZE_MASK;
|
|
int type = (args & IW_PRIV_TYPE_MASK) >> 12;
|
|
|
|
/* Make sure the driver doesn't goof up */
|
|
if (max < num)
|
|
num = max;
|
|
|
|
return num * iw_priv_type_size[type];
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Standard Wireless Handler : get wireless stats
|
|
* Allow programatic access to /proc/net/wireless even if /proc
|
|
* doesn't exist... Also more efficient...
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Standard Wireless Handler : get iwpriv definitions
|
|
* Export the driver private handler definition
|
|
* They will be picked up by tools like iwpriv...
|
|
*/
|
|
static int iw_handler_get_private(struct net_device * dev,
|
|
struct iw_request_info * info,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
/* Check if the driver has something to export */
|
|
if ((dev->wireless_handlers->num_private_args == 0) ||
|
|
(dev->wireless_handlers->private_args == NULL))
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Check if there is enough buffer up there */
|
|
if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
|
|
/* User space can't know in advance how large the buffer
|
|
* needs to be. Give it a hint, so that we can support
|
|
* any size buffer we want somewhat efficiently... */
|
|
wrqu->data.length = dev->wireless_handlers->num_private_args;
|
|
return -E2BIG;
|
|
}
|
|
|
|
/* Set the number of available ioctls. */
|
|
wrqu->data.length = dev->wireless_handlers->num_private_args;
|
|
|
|
/* Copy structure to the user buffer. */
|
|
memcpy(extra, dev->wireless_handlers->private_args,
|
|
sizeof(struct iw_priv_args) * wrqu->data.length);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/******************** /proc/net/wireless SUPPORT ********************/
|
|
/*
|
|
* The /proc/net/wireless file is a human readable user-space interface
|
|
* exporting various wireless specific statistics from the wireless devices.
|
|
* This is the most popular part of the Wireless Extensions ;-)
|
|
*
|
|
* This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
|
|
* The content of the file is basically the content of "struct iw_statistics".
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Print one entry (line) of /proc/net/wireless
|
|
*/
|
|
static void wireless_seq_printf_stats(struct seq_file *seq,
|
|
struct net_device *dev)
|
|
{
|
|
/* Get stats from the driver */
|
|
struct iw_statistics *stats = get_wireless_stats(dev);
|
|
|
|
if (stats) {
|
|
seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
|
|
"%6d %6d %6d\n",
|
|
dev->name, stats->status, stats->qual.qual,
|
|
stats->qual.updated & IW_QUAL_QUAL_UPDATED
|
|
? '.' : ' ',
|
|
((__s32) stats->qual.level) -
|
|
((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
|
|
stats->qual.updated & IW_QUAL_LEVEL_UPDATED
|
|
? '.' : ' ',
|
|
((__s32) stats->qual.noise) -
|
|
((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
|
|
stats->qual.updated & IW_QUAL_NOISE_UPDATED
|
|
? '.' : ' ',
|
|
stats->discard.nwid, stats->discard.code,
|
|
stats->discard.fragment, stats->discard.retries,
|
|
stats->discard.misc, stats->miss.beacon);
|
|
stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
|
|
}
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Print info for /proc/net/wireless (print all entries)
|
|
*/
|
|
static int wireless_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_printf(seq, "Inter-| sta-| Quality | Discarded "
|
|
"packets | Missed | WE\n"
|
|
" face | tus | link level noise | nwid "
|
|
"crypt frag retry misc | beacon | %d\n",
|
|
WIRELESS_EXT);
|
|
else
|
|
wireless_seq_printf_stats(seq, v);
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations wireless_seq_ops = {
|
|
.start = dev_seq_start,
|
|
.next = dev_seq_next,
|
|
.stop = dev_seq_stop,
|
|
.show = wireless_seq_show,
|
|
};
|
|
|
|
static int wireless_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open_net(inode, file, &wireless_seq_ops,
|
|
sizeof(struct seq_net_private));
|
|
}
|
|
|
|
static const struct file_operations wireless_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = wireless_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
int wext_proc_init(struct net *net)
|
|
{
|
|
/* Create /proc/net/wireless entry */
|
|
if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void wext_proc_exit(struct net *net)
|
|
{
|
|
proc_net_remove(net, "wireless");
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/************************** IOCTL SUPPORT **************************/
|
|
/*
|
|
* The original user space API to configure all those Wireless Extensions
|
|
* is through IOCTLs.
|
|
* In there, we check if we need to call the new driver API (iw_handler)
|
|
* or just call the driver ioctl handler.
|
|
*/
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
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];
|
|
|
|
err = copy_from_user(essid, iwp->pointer,
|
|
iwp->length *
|
|
descr->token_size);
|
|
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;
|
|
}
|
|
}
|
|
|
|
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 == -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;
|
|
}
|
|
|
|
/*
|
|
* 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 ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
|
|
return -EOPNOTSUPP;
|
|
descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Wrapper to call a private Wireless Extension handler.
|
|
* We do various checks and also take care of moving data between
|
|
* user space and kernel space.
|
|
* It's not as nice and slimline as the standard wrapper. The cause
|
|
* is struct iw_priv_args, which was not really designed for the
|
|
* job we are going here.
|
|
*
|
|
* IMPORTANT : This function prevent to set and get data on the same
|
|
* IOCTL and enforce the SET/GET convention. Not doing it would be
|
|
* far too hairy...
|
|
* If you need to set and get data at the same time, please don't use
|
|
* a iw_handler but process it in your ioctl handler (i.e. use the
|
|
* old driver API).
|
|
*/
|
|
static int get_priv_descr_and_size(struct net_device *dev, unsigned int cmd,
|
|
const struct iw_priv_args **descrp)
|
|
{
|
|
const struct iw_priv_args *descr;
|
|
int i, extra_size;
|
|
|
|
descr = NULL;
|
|
for (i = 0; i < dev->wireless_handlers->num_private_args; i++) {
|
|
if (cmd == dev->wireless_handlers->private_args[i].cmd) {
|
|
descr = &dev->wireless_handlers->private_args[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
extra_size = 0;
|
|
if (descr) {
|
|
if (IW_IS_SET(cmd)) {
|
|
int offset = 0; /* For sub-ioctls */
|
|
/* Check for sub-ioctl handler */
|
|
if (descr->name[0] == '\0')
|
|
/* Reserve one int for sub-ioctl index */
|
|
offset = sizeof(__u32);
|
|
|
|
/* Size of set arguments */
|
|
extra_size = get_priv_size(descr->set_args);
|
|
|
|
/* Does it fits in iwr ? */
|
|
if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
|
|
((extra_size + offset) <= IFNAMSIZ))
|
|
extra_size = 0;
|
|
} else {
|
|
/* Size of get arguments */
|
|
extra_size = get_priv_size(descr->get_args);
|
|
|
|
/* Does it fits in iwr ? */
|
|
if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
|
|
(extra_size <= IFNAMSIZ))
|
|
extra_size = 0;
|
|
}
|
|
}
|
|
*descrp = descr;
|
|
return extra_size;
|
|
}
|
|
|
|
static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd,
|
|
const struct iw_priv_args *descr,
|
|
iw_handler handler, struct net_device *dev,
|
|
struct iw_request_info *info, int extra_size)
|
|
{
|
|
char *extra;
|
|
int err;
|
|
|
|
/* Check what user space is giving us */
|
|
if (IW_IS_SET(cmd)) {
|
|
if (!iwp->pointer && iwp->length != 0)
|
|
return -EFAULT;
|
|
|
|
if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK))
|
|
return -E2BIG;
|
|
} else if (!iwp->pointer)
|
|
return -EFAULT;
|
|
|
|
extra = kmalloc(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, extra_size)) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Call the handler */
|
|
err = handler(dev, info, (union iwreq_data *) iwp, extra);
|
|
|
|
/* If we have something to return to the user */
|
|
if (!err && IW_IS_GET(cmd)) {
|
|
/* Adjust for the actual length if it's variable,
|
|
* avoid leaking kernel bits outside.
|
|
*/
|
|
if (!(descr->get_args & IW_PRIV_SIZE_FIXED))
|
|
extra_size = adjust_priv_size(descr->get_args, iwp);
|
|
|
|
if (copy_to_user(iwp->pointer, extra, extra_size))
|
|
err = -EFAULT;
|
|
}
|
|
|
|
out:
|
|
kfree(extra);
|
|
return err;
|
|
}
|
|
|
|
static int ioctl_private_call(struct net_device *dev, struct iwreq *iwr,
|
|
unsigned int cmd, struct iw_request_info *info,
|
|
iw_handler handler)
|
|
{
|
|
int extra_size = 0, ret = -EINVAL;
|
|
const struct iw_priv_args *descr;
|
|
|
|
extra_size = get_priv_descr_and_size(dev, cmd, &descr);
|
|
|
|
/* Check if we have a pointer to user space data or not. */
|
|
if (extra_size == 0) {
|
|
/* No extra arguments. Trivial to handle */
|
|
ret = handler(dev, info, &(iwr->u), (char *) &(iwr->u));
|
|
} else {
|
|
ret = ioctl_private_iw_point(&iwr->u.data, cmd, descr,
|
|
handler, dev, info, extra_size);
|
|
}
|
|
|
|
/* Call commit handler if needed and defined */
|
|
if (ret == -EIWCOMMIT)
|
|
ret = call_commit_handler(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
|
|
unsigned int, struct iw_request_info *,
|
|
iw_handler);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
|
|
return standard(dev, iwr, cmd, info,
|
|
&iw_handler_get_private);
|
|
|
|
/* 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
|
|
return private(dev, iwr, cmd, info, handler);
|
|
}
|
|
/* Old driver API : call driver ioctl handler */
|
|
if (dev->do_ioctl)
|
|
return dev->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;
|
|
}
|
|
|
|
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 + (cmd - SIOCIWFIRST);
|
|
|
|
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;
|
|
}
|
|
|
|
static int compat_private_call(struct net_device *dev, struct iwreq *iwr,
|
|
unsigned int cmd, struct iw_request_info *info,
|
|
iw_handler handler)
|
|
{
|
|
const struct iw_priv_args *descr;
|
|
int ret, extra_size;
|
|
|
|
extra_size = get_priv_descr_and_size(dev, cmd, &descr);
|
|
|
|
/* Check if we have a pointer to user space data or not. */
|
|
if (extra_size == 0) {
|
|
/* No extra arguments. Trivial to handle */
|
|
ret = handler(dev, info, &(iwr->u), (char *) &(iwr->u));
|
|
} else {
|
|
struct compat_iw_point *iwp_compat;
|
|
struct iw_point iwp;
|
|
|
|
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;
|
|
|
|
ret = ioctl_private_iw_point(&iwp, cmd, descr,
|
|
handler, dev, info, extra_size);
|
|
|
|
iwp_compat->pointer = ptr_to_compat(iwp.pointer);
|
|
iwp_compat->length = iwp.length;
|
|
iwp_compat->flags = iwp.flags;
|
|
}
|
|
|
|
/* Call commit handler if needed and defined */
|
|
if (ret == -EIWCOMMIT)
|
|
ret = call_commit_handler(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
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
|
|
|
|
/************************* EVENT PROCESSING *************************/
|
|
/*
|
|
* Process events generated by the wireless layer or the driver.
|
|
* Most often, the event will be propagated through rtnetlink
|
|
*/
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Locking...
|
|
* ----------
|
|
*
|
|
* Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
|
|
* the locking issue in here and implementing this code !
|
|
*
|
|
* The issue : wireless_send_event() is often called in interrupt context,
|
|
* while the Netlink layer can never be called in interrupt context.
|
|
* The fully formed RtNetlink events are queued, and then a tasklet is run
|
|
* to feed those to Netlink.
|
|
* The skb_queue is interrupt safe, and its lock is not held while calling
|
|
* Netlink, so there is no possibility of dealock.
|
|
* Jean II
|
|
*/
|
|
|
|
static struct sk_buff_head wireless_nlevent_queue;
|
|
|
|
static int __init wireless_nlevent_init(void)
|
|
{
|
|
skb_queue_head_init(&wireless_nlevent_queue);
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(wireless_nlevent_init);
|
|
|
|
static void wireless_nlevent_process(unsigned long data)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(&wireless_nlevent_queue)))
|
|
rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
|
|
}
|
|
|
|
static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Fill a rtnetlink message with our event data.
|
|
* Note that we propage only the specified event and don't dump the
|
|
* current wireless config. Dumping the wireless config is far too
|
|
* expensive (for each parameter, the driver need to query the hardware).
|
|
*/
|
|
static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev,
|
|
int type, char *event, int event_len)
|
|
{
|
|
struct ifinfomsg *r;
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
r = nlmsg_data(nlh);
|
|
r->ifi_family = AF_UNSPEC;
|
|
r->__ifi_pad = 0;
|
|
r->ifi_type = dev->type;
|
|
r->ifi_index = dev->ifindex;
|
|
r->ifi_flags = dev_get_flags(dev);
|
|
r->ifi_change = 0; /* Wireless changes don't affect those flags */
|
|
|
|
NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
|
|
/* Add the wireless events in the netlink packet */
|
|
NLA_PUT(skb, IFLA_WIRELESS, event_len, event);
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Create and broadcast and send it on the standard rtnetlink socket
|
|
* This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
|
|
* Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
|
|
* within a RTM_NEWLINK event.
|
|
*/
|
|
static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
|
|
if (err < 0) {
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
|
|
skb_queue_tail(&wireless_nlevent_queue, skb);
|
|
tasklet_schedule(&wireless_nlevent_tasklet);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Main event dispatcher. Called from other parts and drivers.
|
|
* Send the event on the appropriate channels.
|
|
* May be called from interrupt context.
|
|
*/
|
|
void wireless_send_event(struct net_device * dev,
|
|
unsigned int cmd,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
const struct iw_ioctl_description * descr = NULL;
|
|
int extra_len = 0;
|
|
struct iw_event *event; /* Mallocated whole event */
|
|
int event_len; /* Its size */
|
|
int hdr_len; /* Size of the event header */
|
|
int wrqu_off = 0; /* Offset in wrqu */
|
|
/* Don't "optimise" the following variable, it will crash */
|
|
unsigned cmd_index; /* *MUST* be unsigned */
|
|
|
|
/* Get the description of the Event */
|
|
if (cmd <= SIOCIWLAST) {
|
|
cmd_index = cmd - SIOCIWFIRST;
|
|
if (cmd_index < standard_ioctl_num)
|
|
descr = &(standard_ioctl[cmd_index]);
|
|
} else {
|
|
cmd_index = cmd - IWEVFIRST;
|
|
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...
|
|
*/
|
|
printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
|
|
dev->name, 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) {
|
|
printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
|
|
return;
|
|
}
|
|
if (wrqu->data.length < descr->min_tokens) {
|
|
printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, 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;
|
|
|
|
/* Create temporary buffer to hold the event */
|
|
event = kmalloc(event_len, GFP_ATOMIC);
|
|
if (event == NULL)
|
|
return;
|
|
|
|
/* Fill event */
|
|
event->len = event_len;
|
|
event->cmd = cmd;
|
|
memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
|
|
if (extra)
|
|
memcpy(((char *) event) + hdr_len, extra, extra_len);
|
|
|
|
/* Send via the RtNetlink event channel */
|
|
rtmsg_iwinfo(dev, (char *) event, event_len);
|
|
|
|
/* Cleanup */
|
|
kfree(event);
|
|
|
|
return; /* Always success, I guess ;-) */
|
|
}
|
|
EXPORT_SYMBOL(wireless_send_event);
|
|
|
|
/********************** ENHANCED IWSPY SUPPORT **********************/
|
|
/*
|
|
* In the old days, the driver was handling spy support all by itself.
|
|
* Now, the driver can delegate this task to Wireless Extensions.
|
|
* It needs to use those standard spy iw_handler in struct iw_handler_def,
|
|
* push data to us via wireless_spy_update() and include struct iw_spy_data
|
|
* in its private part (and export it in net_device->wireless_data->spy_data).
|
|
* One of the main advantage of centralising spy support here is that
|
|
* it becomes much easier to improve and extend it without having to touch
|
|
* the drivers. One example is the addition of the Spy-Threshold events.
|
|
*/
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Return the pointer to the spy data in the driver.
|
|
* Because this is called on the Rx path via wireless_spy_update(),
|
|
* we want it to be efficient...
|
|
*/
|
|
static inline struct iw_spy_data *get_spydata(struct net_device *dev)
|
|
{
|
|
/* This is the new way */
|
|
if (dev->wireless_data)
|
|
return dev->wireless_data->spy_data;
|
|
return NULL;
|
|
}
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* Standard Wireless Handler : set Spy List
|
|
*/
|
|
int iw_handler_set_spy(struct net_device * dev,
|
|
struct iw_request_info * info,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
struct iw_spy_data * spydata = get_spydata(dev);
|
|
struct sockaddr * address = (struct sockaddr *) extra;
|
|
|
|
/* Make sure driver is not buggy or using the old API */
|
|
if (!spydata)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Disable spy collection while we copy the addresses.
|
|
* While we copy addresses, any call to wireless_spy_update()
|
|
* will NOP. This is OK, as anyway the addresses are changing. */
|
|
spydata->spy_number = 0;
|
|
|
|
/* We want to operate without locking, because wireless_spy_update()
|
|
* most likely will happen in the interrupt handler, and therefore
|
|
* have its own locking constraints and needs performance.
|
|
* The rtnl_lock() make sure we don't race with the other iw_handlers.
|
|
* This make sure wireless_spy_update() "see" that the spy list
|
|
* is temporarily disabled. */
|
|
smp_wmb();
|
|
|
|
/* Are there are addresses to copy? */
|
|
if (wrqu->data.length > 0) {
|
|
int i;
|
|
|
|
/* Copy addresses */
|
|
for (i = 0; i < wrqu->data.length; i++)
|
|
memcpy(spydata->spy_address[i], address[i].sa_data,
|
|
ETH_ALEN);
|
|
/* Reset stats */
|
|
memset(spydata->spy_stat, 0,
|
|
sizeof(struct iw_quality) * IW_MAX_SPY);
|
|
}
|
|
|
|
/* Make sure above is updated before re-enabling */
|
|
smp_wmb();
|
|
|
|
/* Enable addresses */
|
|
spydata->spy_number = wrqu->data.length;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_set_spy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* Standard Wireless Handler : get Spy List
|
|
*/
|
|
int iw_handler_get_spy(struct net_device * dev,
|
|
struct iw_request_info * info,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
struct iw_spy_data * spydata = get_spydata(dev);
|
|
struct sockaddr * address = (struct sockaddr *) extra;
|
|
int i;
|
|
|
|
/* Make sure driver is not buggy or using the old API */
|
|
if (!spydata)
|
|
return -EOPNOTSUPP;
|
|
|
|
wrqu->data.length = spydata->spy_number;
|
|
|
|
/* Copy addresses. */
|
|
for (i = 0; i < spydata->spy_number; i++) {
|
|
memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
|
|
address[i].sa_family = AF_UNIX;
|
|
}
|
|
/* Copy stats to the user buffer (just after). */
|
|
if (spydata->spy_number > 0)
|
|
memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
|
|
spydata->spy_stat,
|
|
sizeof(struct iw_quality) * spydata->spy_number);
|
|
/* Reset updated flags. */
|
|
for (i = 0; i < spydata->spy_number; i++)
|
|
spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_get_spy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* Standard Wireless Handler : set spy threshold
|
|
*/
|
|
int iw_handler_set_thrspy(struct net_device * dev,
|
|
struct iw_request_info *info,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
struct iw_spy_data * spydata = get_spydata(dev);
|
|
struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
|
|
|
|
/* Make sure driver is not buggy or using the old API */
|
|
if (!spydata)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Just do it */
|
|
memcpy(&(spydata->spy_thr_low), &(threshold->low),
|
|
2 * sizeof(struct iw_quality));
|
|
|
|
/* Clear flag */
|
|
memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_set_thrspy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* Standard Wireless Handler : get spy threshold
|
|
*/
|
|
int iw_handler_get_thrspy(struct net_device * dev,
|
|
struct iw_request_info *info,
|
|
union iwreq_data * wrqu,
|
|
char * extra)
|
|
{
|
|
struct iw_spy_data * spydata = get_spydata(dev);
|
|
struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
|
|
|
|
/* Make sure driver is not buggy or using the old API */
|
|
if (!spydata)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* Just do it */
|
|
memcpy(&(threshold->low), &(spydata->spy_thr_low),
|
|
2 * sizeof(struct iw_quality));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_get_thrspy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* Prepare and send a Spy Threshold event
|
|
*/
|
|
static void iw_send_thrspy_event(struct net_device * dev,
|
|
struct iw_spy_data * spydata,
|
|
unsigned char * address,
|
|
struct iw_quality * wstats)
|
|
{
|
|
union iwreq_data wrqu;
|
|
struct iw_thrspy threshold;
|
|
|
|
/* Init */
|
|
wrqu.data.length = 1;
|
|
wrqu.data.flags = 0;
|
|
/* Copy address */
|
|
memcpy(threshold.addr.sa_data, address, ETH_ALEN);
|
|
threshold.addr.sa_family = ARPHRD_ETHER;
|
|
/* Copy stats */
|
|
memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
|
|
/* Copy also thresholds */
|
|
memcpy(&(threshold.low), &(spydata->spy_thr_low),
|
|
2 * sizeof(struct iw_quality));
|
|
|
|
/* Send event to user space */
|
|
wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Call for the driver to update the spy data.
|
|
* For now, the spy data is a simple array. As the size of the array is
|
|
* small, this is good enough. If we wanted to support larger number of
|
|
* spy addresses, we should use something more efficient...
|
|
*/
|
|
void wireless_spy_update(struct net_device * dev,
|
|
unsigned char * address,
|
|
struct iw_quality * wstats)
|
|
{
|
|
struct iw_spy_data * spydata = get_spydata(dev);
|
|
int i;
|
|
int match = -1;
|
|
|
|
/* Make sure driver is not buggy or using the old API */
|
|
if (!spydata)
|
|
return;
|
|
|
|
/* Update all records that match */
|
|
for (i = 0; i < spydata->spy_number; i++)
|
|
if (!compare_ether_addr(address, spydata->spy_address[i])) {
|
|
memcpy(&(spydata->spy_stat[i]), wstats,
|
|
sizeof(struct iw_quality));
|
|
match = i;
|
|
}
|
|
|
|
/* Generate an event if we cross the spy threshold.
|
|
* To avoid event storms, we have a simple hysteresis : we generate
|
|
* event only when we go under the low threshold or above the
|
|
* high threshold. */
|
|
if (match >= 0) {
|
|
if (spydata->spy_thr_under[match]) {
|
|
if (wstats->level > spydata->spy_thr_high.level) {
|
|
spydata->spy_thr_under[match] = 0;
|
|
iw_send_thrspy_event(dev, spydata,
|
|
address, wstats);
|
|
}
|
|
} else {
|
|
if (wstats->level < spydata->spy_thr_low.level) {
|
|
spydata->spy_thr_under[match] = 1;
|
|
iw_send_thrspy_event(dev, spydata,
|
|
address, wstats);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(wireless_spy_update);
|