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-rw-r--r--net/wireless/wext.c1633
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diff --git a/net/wireless/wext.c b/net/wireless/wext.c
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+++ b/net/wireless/wext.c
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+/*
+ * This file implement the Wireless Extensions APIs.
+ *
+ * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
+ * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
+ *
+ * (As all part of the Linux kernel, this file is GPL)
+ */
+
+/************************** DOCUMENTATION **************************/
+/*
+ * API definition :
+ * --------------
+ * See <linux/wireless.h> for details of the APIs and the rest.
+ *
+ * History :
+ * -------
+ *
+ * v1 - 5.12.01 - Jean II
+ * o Created this file.
+ *
+ * v2 - 13.12.01 - Jean II
+ * o Move /proc/net/wireless stuff from net/core/dev.c to here
+ * o Make Wireless Extension IOCTLs go through here
+ * o Added iw_handler handling ;-)
+ * o Added standard ioctl description
+ * o Initial dumb commit strategy based on orinoco.c
+ *
+ * v3 - 19.12.01 - Jean II
+ * o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call
+ * o Add event dispatcher function
+ * o Add event description
+ * o Propagate events as rtnetlink IFLA_WIRELESS option
+ * o Generate event on selected SET requests
+ *
+ * v4 - 18.04.02 - Jean II
+ * o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
+ *
+ * v5 - 21.06.02 - Jean II
+ * o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup)
+ * o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes
+ * o Add IWEVCUSTOM for driver specific event/scanning token
+ * o Turn on WE_STRICT_WRITE by default + kernel warning
+ * o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num)
+ * o Fix off-by-one in test (extra_size <= IFNAMSIZ)
+ *
+ * v6 - 9.01.03 - Jean II
+ * o Add common spy support : iw_handler_set_spy(), wireless_spy_update()
+ * o Add enhanced spy support : iw_handler_set_thrspy() and event.
+ * o Add WIRELESS_EXT version display in /proc/net/wireless
+ *
+ * v6 - 18.06.04 - Jean II
+ * o Change get_spydata() method for added safety
+ * o Remove spy #ifdef, they are always on -> cleaner code
+ * o Allow any size GET request if user specifies length > max
+ * and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV
+ * o Start migrating get_wireless_stats to struct iw_handler_def
+ * o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus
+ * Based on patch from Pavel Roskin <proski@gnu.org> :
+ * o Fix kernel data leak to user space in private handler handling
+ *
+ * v7 - 18.3.05 - Jean II
+ * o Remove (struct iw_point *)->pointer from events and streams
+ * o Remove spy_offset from struct iw_handler_def
+ * o Start deprecating dev->get_wireless_stats, output a warning
+ * o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
+ * o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
+ *
+ * v8 - 17.02.06 - Jean II
+ * o RtNetlink requests support (SET/GET)
+ *
+ * v8b - 03.08.06 - Herbert Xu
+ * o Fix Wireless Event locking issues.
+ *
+ * v9 - 14.3.06 - Jean II
+ * o Change length in ESSID and NICK to strlen() instead of strlen()+1
+ * o Make standard_ioctl_num and standard_event_num unsigned
+ * o Remove (struct net_device *)->get_wireless_stats()
+ *
+ * v10 - 16.3.07 - Jean II
+ * o Prevent leaking of kernel space in stream on 64 bits.
+ */
+
+/***************************** INCLUDES *****************************/
+
+#include <linux/module.h>
+#include <linux/types.h> /* off_t */
+#include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
+#include <linux/proc_fs.h>
+#include <linux/rtnetlink.h> /* rtnetlink stuff */
+#include <linux/seq_file.h>
+#include <linux/init.h> /* for __init */
+#include <linux/if_arp.h> /* ARPHRD_ETHER */
+#include <linux/etherdevice.h> /* compare_ether_addr */
+#include <linux/interrupt.h>
+
+#include <linux/wireless.h> /* Pretty obvious */
+#include <net/iw_handler.h> /* New driver API */
+#include <net/netlink.h>
+
+#include <asm/uaccess.h> /* copy_to_user() */
+
+/**************************** CONSTANTS ****************************/
+
+/* Debugging stuff */
+#undef WE_IOCTL_DEBUG /* Debug IOCTL API */
+#undef WE_EVENT_DEBUG /* Debug Event dispatcher */
+#undef WE_SPY_DEBUG /* Debug enhanced spy support */
+
+/* Options */
+#define WE_EVENT_RTNETLINK /* Propagate events using RtNetlink */
+#define WE_SET_EVENT /* Generate an event on some set commands */
+
+/************************* GLOBAL VARIABLES *************************/
+/*
+ * You should not use global variables, because of re-entrancy.
+ * On our case, it's only const, so it's OK...
+ */
+/*
+ * Meta-data about all the standard Wireless Extension request we
+ * know about.
+ */
+static const struct iw_ioctl_description standard_ioctl[] = {
+ [SIOCSIWCOMMIT - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_NULL,
+ },
+ [SIOCGIWNAME - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_CHAR,
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWNWID - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ .flags = IW_DESCR_FLAG_EVENT,
+ },
+ [SIOCGIWNWID - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWFREQ - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_FREQ,
+ .flags = IW_DESCR_FLAG_EVENT,
+ },
+ [SIOCGIWFREQ - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_FREQ,
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWMODE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_UINT,
+ .flags = IW_DESCR_FLAG_EVENT,
+ },
+ [SIOCGIWMODE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_UINT,
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWSENS - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWSENS - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWRANGE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_NULL,
+ },
+ [SIOCGIWRANGE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = sizeof(struct iw_range),
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWPRIV - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_NULL,
+ },
+ [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = sizeof(struct iw_priv_args),
+ .max_tokens = 16,
+ .flags = IW_DESCR_FLAG_NOMAX,
+ },
+ [SIOCSIWSTATS - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_NULL,
+ },
+ [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = sizeof(struct iw_statistics),
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWSPY - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = sizeof(struct sockaddr),
+ .max_tokens = IW_MAX_SPY,
+ },
+ [SIOCGIWSPY - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = sizeof(struct sockaddr) +
+ sizeof(struct iw_quality),
+ .max_tokens = IW_MAX_SPY,
+ },
+ [SIOCSIWTHRSPY - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = sizeof(struct iw_thrspy),
+ .min_tokens = 1,
+ .max_tokens = 1,
+ },
+ [SIOCGIWTHRSPY - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = sizeof(struct iw_thrspy),
+ .min_tokens = 1,
+ .max_tokens = 1,
+ },
+ [SIOCSIWAP - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_ADDR,
+ },
+ [SIOCGIWAP - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_ADDR,
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWMLME - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .min_tokens = sizeof(struct iw_mlme),
+ .max_tokens = sizeof(struct iw_mlme),
+ },
+ [SIOCGIWAPLIST - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = sizeof(struct sockaddr) +
+ sizeof(struct iw_quality),
+ .max_tokens = IW_MAX_AP,
+ .flags = IW_DESCR_FLAG_NOMAX,
+ },
+ [SIOCSIWSCAN - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .min_tokens = 0,
+ .max_tokens = sizeof(struct iw_scan_req),
+ },
+ [SIOCGIWSCAN - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_SCAN_MAX_DATA,
+ .flags = IW_DESCR_FLAG_NOMAX,
+ },
+ [SIOCSIWESSID - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_ESSID_MAX_SIZE,
+ .flags = IW_DESCR_FLAG_EVENT,
+ },
+ [SIOCGIWESSID - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_ESSID_MAX_SIZE,
+ .flags = IW_DESCR_FLAG_DUMP,
+ },
+ [SIOCSIWNICKN - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_ESSID_MAX_SIZE,
+ },
+ [SIOCGIWNICKN - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_ESSID_MAX_SIZE,
+ },
+ [SIOCSIWRATE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWRATE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWRTS - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWRTS - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWFRAG - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWFRAG - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWTXPOW - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWTXPOW - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWRETRY - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWRETRY - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWENCODE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_ENCODING_TOKEN_MAX,
+ .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
+ },
+ [SIOCGIWENCODE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_ENCODING_TOKEN_MAX,
+ .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
+ },
+ [SIOCSIWPOWER - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWPOWER - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWGENIE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_GENERIC_IE_MAX,
+ },
+ [SIOCGIWGENIE - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_GENERIC_IE_MAX,
+ },
+ [SIOCSIWAUTH - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCGIWAUTH - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_PARAM,
+ },
+ [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .min_tokens = sizeof(struct iw_encode_ext),
+ .max_tokens = sizeof(struct iw_encode_ext) +
+ IW_ENCODING_TOKEN_MAX,
+ },
+ [SIOCGIWENCODEEXT - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .min_tokens = sizeof(struct iw_encode_ext),
+ .max_tokens = sizeof(struct iw_encode_ext) +
+ IW_ENCODING_TOKEN_MAX,
+ },
+ [SIOCSIWPMKSA - SIOCIWFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .min_tokens = sizeof(struct iw_pmksa),
+ .max_tokens = sizeof(struct iw_pmksa),
+ },
+};
+static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
+
+/*
+ * Meta-data about all the additional standard Wireless Extension events
+ * we know about.
+ */
+static const struct iw_ioctl_description standard_event[] = {
+ [IWEVTXDROP - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_ADDR,
+ },
+ [IWEVQUAL - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_QUAL,
+ },
+ [IWEVCUSTOM - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_CUSTOM_MAX,
+ },
+ [IWEVREGISTERED - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_ADDR,
+ },
+ [IWEVEXPIRED - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_ADDR,
+ },
+ [IWEVGENIE - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_GENERIC_IE_MAX,
+ },
+ [IWEVMICHAELMICFAILURE - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = sizeof(struct iw_michaelmicfailure),
+ },
+ [IWEVASSOCREQIE - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_GENERIC_IE_MAX,
+ },
+ [IWEVASSOCRESPIE - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = IW_GENERIC_IE_MAX,
+ },
+ [IWEVPMKIDCAND - IWEVFIRST] = {
+ .header_type = IW_HEADER_TYPE_POINT,
+ .token_size = 1,
+ .max_tokens = sizeof(struct iw_pmkid_cand),
+ },
+};
+static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
+
+/* Size (in bytes) of the various private data types */
+static const char iw_priv_type_size[] = {
+ 0, /* IW_PRIV_TYPE_NONE */
+ 1, /* IW_PRIV_TYPE_BYTE */
+ 1, /* IW_PRIV_TYPE_CHAR */
+ 0, /* Not defined */
+ sizeof(__u32), /* IW_PRIV_TYPE_INT */
+ sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
+ sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
+ 0, /* Not defined */
+};
+
+/* Size (in bytes) of various events */
+static const int event_type_size[] = {
+ IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
+ 0,
+ IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
+ 0,
+ IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
+ IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
+ IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
+ 0,
+ IW_EV_POINT_LEN, /* Without variable payload */
+ IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
+ IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
+};
+
+/* Size (in bytes) of various events, as packed */
+static const int event_type_pk_size[] = {
+ IW_EV_LCP_PK_LEN, /* IW_HEADER_TYPE_NULL */
+ 0,
+ IW_EV_CHAR_PK_LEN, /* IW_HEADER_TYPE_CHAR */
+ 0,
+ IW_EV_UINT_PK_LEN, /* IW_HEADER_TYPE_UINT */
+ IW_EV_FREQ_PK_LEN, /* IW_HEADER_TYPE_FREQ */
+ IW_EV_ADDR_PK_LEN, /* IW_HEADER_TYPE_ADDR */
+ 0,
+ IW_EV_POINT_PK_LEN, /* Without variable payload */
+ IW_EV_PARAM_PK_LEN, /* IW_HEADER_TYPE_PARAM */
+ IW_EV_QUAL_PK_LEN, /* IW_HEADER_TYPE_QUAL */
+};
+
+/************************ COMMON SUBROUTINES ************************/
+/*
+ * Stuff that may be used in various place or doesn't fit in one
+ * of the section below.
+ */
+
+/* ---------------------------------------------------------------- */
+/*
+ * Return the driver handler associated with a specific Wireless Extension.
+ * Called from various place, so make sure it remains efficient.
+ */
+static inline 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 */
+
+ /* 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 inline 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 (struct iw_statistics *) 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 inline 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 inline 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 inline int adjust_priv_size(__u16 args,
+ union iwreq_data * wrqu)
+{
+ int num = wrqu->data.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 != (struct iw_statistics *) NULL) {
+
+ /* 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 __inline__ 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(file, &wireless_seq_ops);
+}
+
+static const struct file_operations wireless_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = wireless_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+int __init wireless_proc_init(void)
+{
+ /* Create /proc/net/wireless entry */
+ if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
+ return -ENOMEM;
+
+ return 0;
+}
+#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.
+ */
+
+/* ---------------------------------------------------------------- */
+/*
+ * 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 ifreq * ifr,
+ unsigned int cmd,
+ iw_handler handler)
+{
+ struct iwreq * iwr = (struct iwreq *) ifr;
+ const struct iw_ioctl_description * descr;
+ struct iw_request_info info;
+ int ret = -EINVAL;
+
+ /* Get the description of the IOCTL */
+ if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
+ return -EOPNOTSUPP;
+ descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
+
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
+ ifr->ifr_name, cmd);
+ printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
+#endif /* WE_IOCTL_DEBUG */
+
+ /* Prepare the call */
+ info.cmd = cmd;
+ info.flags = 0;
+
+ /* 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);
+
+#ifdef WE_SET_EVENT
+ /* 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);
+#endif /* WE_SET_EVENT */
+ } else {
+ char * extra;
+ int extra_size;
+ int user_length = 0;
+ int err;
+ int essid_compat = 0;
+
+ /* Calculate space needed by arguments. Always allocate
+ * for max space. Easier, and won't last long... */
+ 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 (iwr->u.data.length == descr->max_tokens + 1)
+ essid_compat = 1;
+ else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
+ char essid[IW_ESSID_MAX_SIZE + 1];
+
+ err = copy_from_user(essid, iwr->u.data.pointer,
+ iwr->u.data.length *
+ descr->token_size);
+ if (err)
+ return -EFAULT;
+
+ if (essid[iwr->u.data.length - 1] == '\0')
+ essid_compat = 1;
+ }
+ break;
+ default:
+ break;
+ }
+
+ iwr->u.data.length -= essid_compat;
+
+ /* Check what user space is giving us */
+ if (IW_IS_SET(cmd)) {
+ /* Check NULL pointer */
+ if ((iwr->u.data.pointer == NULL) &&
+ (iwr->u.data.length != 0))
+ return -EFAULT;
+ /* Check if number of token fits within bounds */
+ if (iwr->u.data.length > descr->max_tokens)
+ return -E2BIG;
+ if (iwr->u.data.length < descr->min_tokens)
+ return -EINVAL;
+ } else {
+ /* Check NULL pointer */
+ if (iwr->u.data.pointer == NULL)
+ return -EFAULT;
+ /* Save user space buffer size for checking */
+ user_length = iwr->u.data.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... */
+ }
+ }
+
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
+ dev->name, extra_size);
+#endif /* WE_IOCTL_DEBUG */
+
+ /* Create the kernel buffer */
+ /* kzalloc ensures NULL-termination for essid_compat */
+ extra = kzalloc(extra_size, GFP_KERNEL);
+ if (extra == NULL) {
+ return -ENOMEM;
+ }
+
+ /* If it is a SET, get all the extra data in here */
+ if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
+ err = copy_from_user(extra, iwr->u.data.pointer,
+ iwr->u.data.length *
+ descr->token_size);
+ if (err) {
+ kfree(extra);
+ return -EFAULT;
+ }
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
+ dev->name,
+ iwr->u.data.length * descr->token_size);
+#endif /* WE_IOCTL_DEBUG */
+ }
+
+ /* Call the handler */
+ ret = handler(dev, &info, &(iwr->u), extra);
+
+ iwr->u.data.length += essid_compat;
+
+ /* If we have something to return to the user */
+ if (!ret && IW_IS_GET(cmd)) {
+ /* Check if there is enough buffer up there */
+ if (user_length < iwr->u.data.length) {
+ kfree(extra);
+ return -E2BIG;
+ }
+
+ err = copy_to_user(iwr->u.data.pointer, extra,
+ iwr->u.data.length *
+ descr->token_size);
+ if (err)
+ ret = -EFAULT;
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
+ dev->name,
+ iwr->u.data.length * descr->token_size);
+#endif /* WE_IOCTL_DEBUG */
+ }
+
+#ifdef WE_SET_EVENT
+ /* Generate an event to notify listeners of the change */
+ if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
+ ((ret == 0) || (ret == -EIWCOMMIT))) {
+ if (descr->flags & IW_DESCR_FLAG_RESTRICT)
+ /* If the event is restricted, don't
+ * export the payload */
+ wireless_send_event(dev, cmd, &(iwr->u), NULL);
+ else
+ wireless_send_event(dev, cmd, &(iwr->u),
+ extra);
+ }
+#endif /* WE_SET_EVENT */
+
+ /* Cleanup - I told you it wasn't that long ;-) */
+ kfree(extra);
+ }
+
+ /* 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 inline int ioctl_private_call(struct net_device * dev,
+ struct ifreq * ifr,
+ unsigned int cmd,
+ iw_handler handler)
+{
+ struct iwreq * iwr = (struct iwreq *) ifr;
+ const struct iw_priv_args * descr = NULL;
+ struct iw_request_info info;
+ int extra_size = 0;
+ int i;
+ int ret = -EINVAL;
+
+ /* Get the description of the IOCTL */
+ 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;
+ }
+
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
+ ifr->ifr_name, cmd);
+ if (descr) {
+ printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
+ dev->name, descr->name,
+ descr->set_args, descr->get_args);
+ }
+#endif /* WE_IOCTL_DEBUG */
+
+ /* Compute the size of the set/get arguments */
+ if (descr != NULL) {
+ 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;
+ }
+ }
+
+ /* Prepare the call */
+ info.cmd = cmd;
+ info.flags = 0;
+
+ /* 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 {
+ char * extra;
+ int err;
+
+ /* Check what user space is giving us */
+ if (IW_IS_SET(cmd)) {
+ /* Check NULL pointer */
+ if ((iwr->u.data.pointer == NULL) &&
+ (iwr->u.data.length != 0))
+ return -EFAULT;
+
+ /* Does it fits within bounds ? */
+ if (iwr->u.data.length > (descr->set_args &
+ IW_PRIV_SIZE_MASK))
+ return -E2BIG;
+ } else {
+ /* Check NULL pointer */
+ if (iwr->u.data.pointer == NULL)
+ return -EFAULT;
+ }
+
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
+ dev->name, extra_size);
+#endif /* WE_IOCTL_DEBUG */
+
+ /* Always allocate for max space. Easier, and won't last
+ * long... */
+ extra = kmalloc(extra_size, GFP_KERNEL);
+ if (extra == NULL) {
+ return -ENOMEM;
+ }
+
+ /* If it is a SET, get all the extra data in here */
+ if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
+ err = copy_from_user(extra, iwr->u.data.pointer,
+ extra_size);
+ if (err) {
+ kfree(extra);
+ return -EFAULT;
+ }
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
+ dev->name, iwr->u.data.length);
+#endif /* WE_IOCTL_DEBUG */
+ }
+
+ /* Call the handler */
+ ret = handler(dev, &info, &(iwr->u), extra);
+
+ /* If we have something to return to the user */
+ if (!ret && 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,
+ &(iwr->u));
+ }
+
+ err = copy_to_user(iwr->u.data.pointer, extra,
+ extra_size);
+ if (err)
+ ret = -EFAULT;
+#ifdef WE_IOCTL_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
+ dev->name, iwr->u.data.length);
+#endif /* WE_IOCTL_DEBUG */
+ }
+
+ /* Cleanup - I told you it wasn't that long ;-) */
+ kfree(extra);
+ }
+
+
+ /* Call commit handler if needed and defined */
+ if (ret == -EIWCOMMIT)
+ ret = call_commit_handler(dev);
+
+ return ret;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Main IOCTl dispatcher. Called from the main networking code
+ * (dev_ioctl() in net/core/dev.c).
+ * Check the type of IOCTL and call the appropriate wrapper...
+ */
+int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
+{
+ 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(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) */
+ switch (cmd) {
+ case SIOCGIWSTATS:
+ /* Get Wireless Stats */
+ return ioctl_standard_call(dev,
+ ifr,
+ cmd,
+ &iw_handler_get_iwstats);
+
+ case SIOCGIWPRIV:
+ /* Check if we have some wireless handlers defined */
+ if (dev->wireless_handlers != NULL) {
+ /* We export to user space the definition of
+ * the private handler ourselves */
+ return ioctl_standard_call(dev,
+ ifr,
+ cmd,
+ &iw_handler_get_private);
+ }
+ // ## Fall-through for old API ##
+ default:
+ /* Generic IOCTL */
+ /* Basic check */
+ if (!netif_device_present(dev))
+ return -ENODEV;
+ /* New driver API : try to find the handler */
+ handler = get_handler(dev, cmd);
+ if (handler != NULL) {
+ /* Standard and private are not the same */
+ if (cmd < SIOCIWFIRSTPRIV)
+ return ioctl_standard_call(dev,
+ ifr,
+ cmd,
+ handler);
+ else
+ return ioctl_private_call(dev,
+ ifr,
+ cmd,
+ handler);
+ }
+ /* Old driver API : call driver ioctl handler */
+ if (dev->do_ioctl) {
+ return dev->do_ioctl(dev, ifr, cmd);
+ }
+ return -EOPNOTSUPP;
+ }
+ /* Not reached */
+ return -EINVAL;
+}
+
+
+/************************* EVENT PROCESSING *************************/
+/*
+ * Process events generated by the wireless layer or the driver.
+ * Most often, the event will be propagated through rtnetlink
+ */
+
+#ifdef WE_EVENT_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, 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 inline 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;
+ unsigned char *b = skb_tail_pointer(skb);
+
+ nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
+ 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 */
+
+ /* Add the wireless events in the netlink packet */
+ RTA_PUT(skb, IFLA_WIRELESS, event_len, event);
+
+ nlh->nlmsg_len = skb_tail_pointer(skb) - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * 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 inline void rtmsg_iwinfo(struct net_device * dev,
+ char * event,
+ int event_len)
+{
+ struct sk_buff *skb;
+ int size = NLMSG_GOODSIZE;
+
+ skb = alloc_skb(size, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
+ event, event_len) < 0) {
+ kfree_skb(skb);
+ return;
+ }
+ NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
+ skb_queue_tail(&wireless_nlevent_queue, skb);
+ tasklet_schedule(&wireless_nlevent_tasklet);
+}
+
+#endif /* WE_EVENT_RTNETLINK */
+
+/* ---------------------------------------------------------------- */
+/*
+ * 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;
+ }
+#ifdef WE_EVENT_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
+ dev->name, cmd);
+ printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
+#endif /* WE_EVENT_DEBUG */
+
+ /* 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;
+#ifdef WE_EVENT_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
+#endif /* WE_EVENT_DEBUG */
+ }
+
+ /* Total length of the event */
+ hdr_len = event_type_size[descr->header_type];
+ event_len = hdr_len + extra_len;
+
+#ifdef WE_EVENT_DEBUG
+ printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, wrqu_off %d, event_len %d\n", dev->name, cmd, hdr_len, wrqu_off, event_len);
+#endif /* WE_EVENT_DEBUG */
+
+ /* 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 != NULL)
+ memcpy(((char *) event) + hdr_len, extra, extra_len);
+
+#ifdef WE_EVENT_RTNETLINK
+ /* Send via the RtNetlink event channel */
+ rtmsg_iwinfo(dev, (char *) event, event_len);
+#endif /* WE_EVENT_RTNETLINK */
+
+ /* Cleanup */
+ kfree(event);
+
+ return; /* Always success, I guess ;-) */
+}
+
+/********************** 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);
+
+#ifdef WE_SPY_DEBUG
+ printk(KERN_DEBUG "iw_handler_set_spy() : wireless_data %p, spydata %p, num %d\n", dev->wireless_data, spydata, wrqu->data.length);
+ for (i = 0; i < wrqu->data.length; i++)
+ printk(KERN_DEBUG
+ "%02X:%02X:%02X:%02X:%02X:%02X \n",
+ spydata->spy_address[i][0],
+ spydata->spy_address[i][1],
+ spydata->spy_address[i][2],
+ spydata->spy_address[i][3],
+ spydata->spy_address[i][4],
+ spydata->spy_address[i][5]);
+#endif /* WE_SPY_DEBUG */
+ }
+
+ /* Make sure above is updated before re-enabling */
+ smp_wmb();
+
+ /* Enable addresses */
+ spydata->spy_number = wrqu->data.length;
+
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * 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;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * 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));
+
+#ifdef WE_SPY_DEBUG
+ printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
+#endif /* WE_SPY_DEBUG */
+
+ return 0;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * 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;
+}
+
+/*------------------------------------------------------------------*/
+/*
+ * 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));
+
+#ifdef WE_SPY_DEBUG
+ printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
+ threshold.addr.sa_data[0],
+ threshold.addr.sa_data[1],
+ threshold.addr.sa_data[2],
+ threshold.addr.sa_data[3],
+ threshold.addr.sa_data[4],
+ threshold.addr.sa_data[5], threshold.qual.level);
+#endif /* WE_SPY_DEBUG */
+
+ /* 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;
+
+#ifdef WE_SPY_DEBUG
+ printk(KERN_DEBUG "wireless_spy_update() : wireless_data %p, spydata %p, address %02X:%02X:%02X:%02X:%02X:%02X\n", dev->wireless_data, spydata, address[0], address[1], address[2], address[3], address[4], address[5]);
+#endif /* WE_SPY_DEBUG */
+
+ /* 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(iw_handler_get_spy);
+EXPORT_SYMBOL(iw_handler_get_thrspy);
+EXPORT_SYMBOL(iw_handler_set_spy);
+EXPORT_SYMBOL(iw_handler_set_thrspy);
+EXPORT_SYMBOL(wireless_send_event);
+EXPORT_SYMBOL(wireless_spy_update);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 01:58:40 +0000