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1189 lines
32 KiB
1189 lines
32 KiB
/* |
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* This file implement the Wireless Extensions core API. |
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* |
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* Authors : Jean Tourrilhes - HPL - <[email protected]> |
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* Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. |
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* Copyright 2009 Johannes Berg <[email protected]> |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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|
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/* IW event code */ |
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|
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void wireless_nlevent_flush(void) |
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{ |
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struct sk_buff *skb; |
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struct net *net; |
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|
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down_read(&net_rwsem); |
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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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up_read(&net_rwsem); |
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} |
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EXPORT_SYMBOL_GPL(wireless_nlevent_flush); |
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|
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static int wext_netdev_notifier_call(struct notifier_block *nb, |
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unsigned long state, void *ptr) |
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{ |
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/* |
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* When a netdev changes state in any way, flush all pending messages |
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* to avoid them going out in a strange order, e.g. RTM_NEWLINK after |
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* RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close() |
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* or similar - all of which could otherwise happen due to delays from |
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* schedule_work(). |
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*/ |
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wireless_nlevent_flush(); |
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|
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return NOTIFY_OK; |
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} |
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|
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static struct notifier_block wext_netdev_notifier = { |
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.notifier_call = wext_netdev_notifier_call, |
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}; |
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|
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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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|
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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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|
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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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|
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static int __init wireless_nlevent_init(void) |
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{ |
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int err = register_pernet_subsys(&wext_pernet_ops); |
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|
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if (err) |
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return err; |
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|
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err = register_netdevice_notifier(&wext_netdev_notifier); |
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if (err) |
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unregister_pernet_subsys(&wext_pernet_ops); |
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return err; |
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} |
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|
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subsys_initcall(wireless_nlevent_init); |
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|
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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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wireless_nlevent_flush(); |
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} |
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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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|
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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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|
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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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|
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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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* 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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* Nothing in the kernel sends scan events with data, be safe. |
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* This is necessary because we cannot fix up scan event data |
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* 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; |
|
|
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/* Get the description of the Event */ |
|
if (cmd <= SIOCIWLAST) { |
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cmd_index = IW_IOCTL_IDX(cmd); |
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if (cmd_index < standard_ioctl_num) |
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descr = &(standard_ioctl[cmd_index]); |
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} else { |
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cmd_index = IW_EVENT_IDX(cmd); |
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if (cmd_index < standard_event_num) |
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descr = &(standard_event[cmd_index]); |
|
} |
|
/* Don't accept unknown events */ |
|
if (descr == NULL) { |
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/* 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", |
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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 (cmd=0x%04X) too big (%d)\n", |
|
cmd, wrqu->data.length); |
|
return; |
|
} |
|
if (wrqu->data.length < descr->min_tokens) { |
|
netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n", |
|
cmd, 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; |
|
} |
|
|
|
/* noinline to avoid a bogus warning with -O3 */ |
|
static noinline 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 && |
|
dev->wireless_handlers->standard[0]) |
|
/* 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 iwreq *iwr, |
|
unsigned int cmd, |
|
struct iw_request_info *info, |
|
wext_ioctl_func standard, |
|
wext_ioctl_func private) |
|
{ |
|
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, iwr->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); |
|
} |
|
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 iwreq *iwr, |
|
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, iwr->ifr_name); |
|
rtnl_lock(); |
|
ret = wireless_process_ioctl(net, iwr, 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, unsigned int cmd, void __user *arg) |
|
{ |
|
struct iw_request_info info = { .cmd = cmd, .flags = 0 }; |
|
struct iwreq iwr; |
|
int ret; |
|
|
|
if (copy_from_user(&iwr, arg, sizeof(iwr))) |
|
return -EFAULT; |
|
|
|
iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0; |
|
|
|
ret = wext_ioctl_dispatch(net, &iwr, cmd, &info, |
|
ioctl_standard_call, |
|
ioctl_private_call); |
|
if (ret >= 0 && |
|
IW_IS_GET(cmd) && |
|
copy_to_user(arg, &iwr, 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, &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 |
|
|
|
char *iwe_stream_add_event(struct iw_request_info *info, char *stream, |
|
char *ends, struct iw_event *iwe, int event_len) |
|
{ |
|
int lcp_len = iwe_stream_lcp_len(info); |
|
|
|
event_len = iwe_stream_event_len_adjust(info, event_len); |
|
|
|
/* Check if it's possible */ |
|
if (likely((stream + event_len) < ends)) { |
|
iwe->len = event_len; |
|
/* Beware of alignement issues on 64 bits */ |
|
memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN); |
|
memcpy(stream + lcp_len, &iwe->u, |
|
event_len - lcp_len); |
|
stream += event_len; |
|
} |
|
|
|
return stream; |
|
} |
|
EXPORT_SYMBOL(iwe_stream_add_event); |
|
|
|
char *iwe_stream_add_point(struct iw_request_info *info, char *stream, |
|
char *ends, struct iw_event *iwe, char *extra) |
|
{ |
|
int event_len = iwe_stream_point_len(info) + iwe->u.data.length; |
|
int point_len = iwe_stream_point_len(info); |
|
int lcp_len = iwe_stream_lcp_len(info); |
|
|
|
/* Check if it's possible */ |
|
if (likely((stream + event_len) < ends)) { |
|
iwe->len = event_len; |
|
memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN); |
|
memcpy(stream + lcp_len, |
|
((char *) &iwe->u) + IW_EV_POINT_OFF, |
|
IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN); |
|
if (iwe->u.data.length && extra) |
|
memcpy(stream + point_len, extra, iwe->u.data.length); |
|
stream += event_len; |
|
} |
|
|
|
return stream; |
|
} |
|
EXPORT_SYMBOL(iwe_stream_add_point); |
|
|
|
char *iwe_stream_add_value(struct iw_request_info *info, char *event, |
|
char *value, char *ends, struct iw_event *iwe, |
|
int event_len) |
|
{ |
|
int lcp_len = iwe_stream_lcp_len(info); |
|
|
|
/* Don't duplicate LCP */ |
|
event_len -= IW_EV_LCP_LEN; |
|
|
|
/* Check if it's possible */ |
|
if (likely((value + event_len) < ends)) { |
|
/* Add new value */ |
|
memcpy(value, &iwe->u, event_len); |
|
value += event_len; |
|
/* Patch LCP */ |
|
iwe->len = value - event; |
|
memcpy(event, (char *) iwe, lcp_len); |
|
} |
|
|
|
return value; |
|
} |
|
EXPORT_SYMBOL(iwe_stream_add_value);
|
|
|