cregit-Linux how code gets into the kernel

Release 4.11 net/wireless/wext-core.c

Directory: net/wireless
/*
 * This file implement the Wireless Extensions core API.
 *
 * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
 * Copyright    2009 Johannes Berg <johannes@sipsolutions.net>
 *
 * (As all part of the Linux kernel, this file is GPL)
 */
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/wireless.h>
#include <linux/uaccess.h>
#include <linux/export.h>
#include <net/cfg80211.h>
#include <net/iw_handler.h>
#include <net/netlink.h>
#include <net/wext.h>
#include <net/net_namespace.h>


typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
			       unsigned int, struct iw_request_info *,
			       iw_handler);


/*
 * Meta-data about all the standard Wireless Extension request we
 * know about.
 */

static const struct iw_ioctl_description standard_ioctl[] = {
	[IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
		.header_type	= IW_HEADER_TYPE_NULL,
        },
	[IW_IOCTL_IDX(SIOCGIWNAME)] = {
		.header_type	= IW_HEADER_TYPE_CHAR,
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWNWID)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
		.flags		= IW_DESCR_FLAG_EVENT,
        },
	[IW_IOCTL_IDX(SIOCGIWNWID)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWFREQ)] = {
		.header_type	= IW_HEADER_TYPE_FREQ,
		.flags		= IW_DESCR_FLAG_EVENT,
        },
	[IW_IOCTL_IDX(SIOCGIWFREQ)] = {
		.header_type	= IW_HEADER_TYPE_FREQ,
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWMODE)] = {
		.header_type	= IW_HEADER_TYPE_UINT,
		.flags		= IW_DESCR_FLAG_EVENT,
        },
	[IW_IOCTL_IDX(SIOCGIWMODE)] = {
		.header_type	= IW_HEADER_TYPE_UINT,
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWSENS)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWSENS)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWRANGE)] = {
		.header_type	= IW_HEADER_TYPE_NULL,
        },
	[IW_IOCTL_IDX(SIOCGIWRANGE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_range),
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWPRIV)] = {
		.header_type	= IW_HEADER_TYPE_NULL,
        },
	[IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (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,
        },
	[IW_IOCTL_IDX(SIOCSIWSTATS)] = {
		.header_type	= IW_HEADER_TYPE_NULL,
        },
	[IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_statistics),
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWSPY)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr),
		.max_tokens	= IW_MAX_SPY,
        },
	[IW_IOCTL_IDX(SIOCGIWSPY)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr) +
				  sizeof(struct iw_quality),
		.max_tokens	= IW_MAX_SPY,
        },
	[IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_thrspy),
		.min_tokens	= 1,
		.max_tokens	= 1,
        },
	[IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_thrspy),
		.min_tokens	= 1,
		.max_tokens	= 1,
        },
	[IW_IOCTL_IDX(SIOCSIWAP)] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
        },
	[IW_IOCTL_IDX(SIOCGIWAP)] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWMLME)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_mlme),
		.max_tokens	= sizeof(struct iw_mlme),
        },
	[IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
		.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,
        },
	[IW_IOCTL_IDX(SIOCSIWSCAN)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= 0,
		.max_tokens	= sizeof(struct iw_scan_req),
        },
	[IW_IOCTL_IDX(SIOCGIWSCAN)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_SCAN_MAX_DATA,
		.flags		= IW_DESCR_FLAG_NOMAX,
        },
	[IW_IOCTL_IDX(SIOCSIWESSID)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
		.flags		= IW_DESCR_FLAG_EVENT,
        },
	[IW_IOCTL_IDX(SIOCGIWESSID)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
		.flags		= IW_DESCR_FLAG_DUMP,
        },
	[IW_IOCTL_IDX(SIOCSIWNICKN)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
        },
	[IW_IOCTL_IDX(SIOCGIWNICKN)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
        },
	[IW_IOCTL_IDX(SIOCSIWRATE)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWRATE)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWRTS)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWRTS)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWFRAG)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWFRAG)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWRETRY)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWRETRY)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWENCODE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ENCODING_TOKEN_MAX,
		.flags		= IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
        },
	[IW_IOCTL_IDX(SIOCGIWENCODE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ENCODING_TOKEN_MAX,
		.flags		= IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
        },
	[IW_IOCTL_IDX(SIOCSIWPOWER)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWPOWER)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWGENIE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
        },
	[IW_IOCTL_IDX(SIOCGIWGENIE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
        },
	[IW_IOCTL_IDX(SIOCSIWAUTH)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCGIWAUTH)] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
        },
	[IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
		.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,
        },
	[IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
		.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,
        },
	[IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_pmksa),
		.max_tokens	= sizeof(struct iw_pmksa),
        },
};

static const unsigned int 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[] = {
	[IW_EVENT_IDX(IWEVTXDROP)] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
        },
	[IW_EVENT_IDX(IWEVQUAL)] = {
		.header_type	= IW_HEADER_TYPE_QUAL,
        },
	[IW_EVENT_IDX(IWEVCUSTOM)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_CUSTOM_MAX,
        },
	[IW_EVENT_IDX(IWEVREGISTERED)] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
        },
	[IW_EVENT_IDX(IWEVEXPIRED)] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
        },
	[IW_EVENT_IDX(IWEVGENIE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
        },
	[IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_michaelmicfailure),
        },
	[IW_EVENT_IDX(IWEVASSOCREQIE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
        },
	[IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
        },
	[IW_EVENT_IDX(IWEVPMKIDCAND)] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_pmkid_cand),
        },
};

static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);

/* 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 */
};

#ifdef CONFIG_COMPAT

static const int compat_event_type_size[] = {
	IW_EV_COMPAT_LCP_LEN,		/* IW_HEADER_TYPE_NULL */
	0,
	IW_EV_COMPAT_CHAR_LEN,		/* IW_HEADER_TYPE_CHAR */
	0,
	IW_EV_COMPAT_UINT_LEN,		/* IW_HEADER_TYPE_UINT */
	IW_EV_COMPAT_FREQ_LEN,		/* IW_HEADER_TYPE_FREQ */
	IW_EV_COMPAT_ADDR_LEN,		/* IW_HEADER_TYPE_ADDR */
	0,
	IW_EV_COMPAT_POINT_LEN,		/* Without variable payload */
	IW_EV_COMPAT_PARAM_LEN,		/* IW_HEADER_TYPE_PARAM */
	IW_EV_COMPAT_QUAL_LEN,		/* IW_HEADER_TYPE_QUAL */
};
#endif


/* IW event code */


void wireless_nlevent_flush(void) { struct sk_buff *skb; struct net *net; ASSERT_RTNL(); for_each_net(net) { while ((skb = skb_dequeue(&net->wext_nlevents))) rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL); } }

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Johannes Berg55100.00%1100.00%
Total55100.00%1100.00%

EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
static int wext_netdev_notifier_call(struct notifier_block *nb, unsigned long state, void *ptr) { /* * When a netdev changes state in any way, flush all pending messages * to avoid them going out in a strange order, e.g. RTM_NEWLINK after * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close() * or similar - all of which could otherwise happen due to delays from * schedule_work(). */ wireless_nlevent_flush(); return NOTIFY_OK; }

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Johannes Berg26100.00%1100.00%
Total26100.00%1100.00%

static struct notifier_block wext_netdev_notifier = { .notifier_call = wext_netdev_notifier_call, };
static int __net_init wext_pernet_init(struct net *net) { skb_queue_head_init(&net->wext_nlevents); return 0; }

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Johannes Berg1252.17%150.00%
Linus Torvalds1147.83%150.00%
Total23100.00%2100.00%


static void __net_exit wext_pernet_exit(struct net *net) { skb_queue_purge(&net->wext_nlevents); }

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Johannes Berg1260.00%133.33%
Linus Torvalds630.00%133.33%
Andrew Morton210.00%133.33%
Total20100.00%3100.00%

static struct pernet_operations wext_pernet_ops = { .init = wext_pernet_init, .exit = wext_pernet_exit, };
static int __init wireless_nlevent_init(void) { int err = register_pernet_subsys(&wext_pernet_ops); if (err) return err; err = register_netdevice_notifier(&wext_netdev_notifier); if (err) unregister_pernet_subsys(&wext_pernet_ops); return err; }

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PersonTokensPropCommitsCommitProp
Johannes Berg3984.78%360.00%
Linus Torvalds510.87%120.00%
Andrew Morton24.35%120.00%
Total46100.00%5100.00%

subsys_initcall(wireless_nlevent_init); /* Process events generated by the wireless layer or the driver. */
static void wireless_nlevent_process(struct work_struct *work) { rtnl_lock(); wireless_nlevent_flush(); rtnl_unlock(); }

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Johannes Berg1260.00%240.00%
Andrew Morton630.00%120.00%
Linus Torvalds15.00%120.00%
David S. Miller15.00%120.00%
Total20100.00%5100.00%

static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev, struct sk_buff *skb) { struct ifinfomsg *r; struct nlmsghdr *nlh; nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0); if (!nlh) return NULL; 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 */ if (nla_put_string(skb, IFLA_IFNAME, dev->name)) goto nla_put_failure; return nlh; nla_put_failure: nlmsg_cancel(skb, nlh); return NULL; }

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Johannes Berg7956.83%116.67%
Jean Tourrilhes4028.78%233.33%
Linus Torvalds128.63%116.67%
David S. Miller75.04%116.67%
Arnaldo Carvalho de Melo10.72%116.67%
Total139100.00%6100.00%

/* * 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, const 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 int cmd_index; /* *MUST* be unsigned */ struct sk_buff *skb; struct nlmsghdr *nlh; struct nlattr *nla; #ifdef CONFIG_COMPAT struct __compat_iw_event *compat_event; struct compat_iw_point compat_wrqu; struct sk_buff *compskb; #endif /* * Nothing in the kernel sends scan events with data, be safe. * This is necessary because we cannot fix up scan event data * for compat, due to being contained in 'extra', but normally * applications are required to retrieve the scan data anyway * and no data is included in the event, this codifies that * practice. */ if (WARN_ON(cmd == SIOCGIWSCAN && extra)) extra = NULL; /* Get the description of the Event */ if (cmd <= SIOCIWLAST) { cmd_index = IW_IOCTL_IDX(cmd); if (cmd_index < standard_ioctl_num) descr = &(standard_ioctl[cmd_index]); } else { cmd_index = IW_EVENT_IDX(cmd); if (cmd_index < standard_event_num) descr = &(standard_event[cmd_index]); } /* Don't accept unknown events */ if (descr == NULL) { /* Note : we don't return an error to the driver, because * the driver would not know what to do about it. It can't * return an error to the user, because the event is not * initiated by a user request. * The best the driver could do is to log an error message. * We will do it ourselves instead... */ netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n", cmd); return; } /* Check extra parameters and set extra_len */ if (descr->header_type == IW_HEADER_TYPE_POINT) { /* Check if number of token fits within bounds */ if (wrqu->data.length > descr->max_tokens) { netdev_err(dev, "(WE) : Wireless Event (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); }

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Johannes Berg54678.22%529.41%
David S. Miller8211.75%211.76%
Jean Tourrilhes314.44%211.76%
Joe Perches131.86%317.65%
Arnaldo Carvalho de Melo91.29%15.88%
Linus Torvalds60.86%15.88%
Arend Van Spriel60.86%15.88%
John W. Linville40.57%15.88%
Eric Dumazet10.14%15.88%
Total698100.00%17100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg9090.00%266.67%
Herbert Xu1010.00%133.33%
Total100100.00%3100.00%


static int iw_handler_get_iwstats(struct net_device * dev, struct iw_request_info * info, union iwreq_data * wrqu, char * extra) { /* Get stats from the driver */ struct iw_statistics *stats; stats = get_wireless_stats(dev); if (stats) { /* Copy statistics to extra */ memcpy(extra, stats, sizeof(struct iw_statistics)); wrqu->data.length = sizeof(struct iw_statistics); /* Check if we need to clear the updated flag */ if (wrqu->data.flags != 0) stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; return 0; } else return -EOPNOTSUPP; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg7778.57%266.67%
Jean Tourrilhes2121.43%133.33%
Total98100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg10979.56%228.57%
Jean Tourrilhes2014.60%114.29%
Joe Perches32.19%114.29%
Thomas Graf32.19%114.29%
Patrick McHardy10.73%114.29%
Jamal Hadi Salim10.73%114.29%
Total137100.00%7100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg48078.69%450.00%
Jean Tourrilhes12220.00%337.50%
Julia Lawall81.31%112.50%
Total610100.00%8100.00%

/* * Call the commit handler in the driver * (if exist and if conditions are right) * * Note : our current commit strategy is currently pretty dumb, * but we will be able to improve on that... * The goal is to try to agreagate as many changes as possible * before doing the commit. Drivers that will define a commit handler * are usually those that need a reset after changing parameters, so * we want to minimise the number of reset. * A cool idea is to use a timer : at each "set" command, we re-set the * timer, when the timer eventually fires, we call the driver. * Hopefully, more on that later. * * Also, I'm waiting to see how many people will complain about the * netif_running(dev) test. I'm open on that one... * Hopefully, the driver will remember to do a commit in "open()" ;-) */
int call_commit_handler(struct net_device *dev) { #ifdef CONFIG_WIRELESS_EXT if ((netif_running(dev)) && (dev->wireless_handlers->standard[0] != NULL)) /* Call the commit handler on the driver */ return dev->wireless_handlers->standard[0](dev, NULL, NULL, NULL); else return 0; /* Command completed successfully */ #else /* cfg80211 has no commit */ return 0; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg68100.00%2100.00%
Total68100.00%2100.00%

/* * Main IOCTl dispatcher. * Check the type of IOCTL and call the appropriate wrapper... */
static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, struct iw_request_info *info, wext_ioctl_func standard, wext_ioctl_func private) { struct iwreq *iwr = (struct iwreq *) ifr; struct net_device *dev; iw_handler handler; /* Permissions are already checked in dev_ioctl() before calling us. * The copy_to/from_user() of ifr is also dealt with in there */ /* Make sure the device exist */ if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL) return -ENODEV; /* A bunch of special cases, then the generic case... * Note that 'cmd' is already filtered in dev_ioctl() with * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ if (cmd == SIOCGIWSTATS) return standard(dev, iwr, cmd, info, &iw_handler_get_iwstats); #ifdef CONFIG_WEXT_PRIV if (cmd == SIOCGIWPRIV && dev->wireless_handlers) return standard(dev, iwr, cmd, info, iw_handler_get_private); #endif /* Basic check */ if (!netif_device_present(dev)) return -ENODEV; /* New driver API : try to find the handler */ handler = get_handler(dev, cmd); if (handler) { /* Standard and private are not the same */ if (cmd < SIOCIWFIRSTPRIV) return standard(dev, iwr, cmd, info, handler); else if (private) return private(dev, iwr, cmd, info, handler); } /* Old driver API : call driver ioctl handler */ if (dev->netdev_ops->ndo_do_ioctl) return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd); return -EOPNOTSUPP; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg21898.64%375.00%
Jean Tourrilhes31.36%125.00%
Total221100.00%4100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg2870.00%150.00%
Andrew Morton1230.00%150.00%
Total40100.00%2100.00%

/* entry point from dev ioctl */
static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr, unsigned int cmd, struct iw_request_info *info, wext_ioctl_func standard, wext_ioctl_func private) { int ret = wext_permission_check(cmd); if (ret) return ret; dev_load(net, ifr->ifr_name); rtnl_lock(); ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private); rtnl_unlock(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg4251.85%133.33%
Jean Tourrilhes2834.57%133.33%
Andrew Morton1113.58%133.33%
Total81100.00%3100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg12467.76%240.00%
Jean Tourrilhes4625.14%120.00%
Andrew Morton73.83%120.00%
Joe Perches63.28%120.00%
Total183100.00%5100.00%


int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, void __user *arg) { struct iw_request_info info = { .cmd = cmd, .flags = 0 }; int ret; ret = wext_ioctl_dispatch(net, ifr, cmd, &info, ioctl_standard_call, ioctl_private_call); if (ret >= 0 && IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct iwreq))) return -EFAULT; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg6065.22%150.00%
Jean Tourrilhes3234.78%150.00%
Total92100.00%2100.00%

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg11368.07%240.00%
Jean Tourrilhes4627.71%120.00%
Andrew Morton42.41%120.00%
Joe Perches31.81%120.00%
Total166100.00%5100.00%


int compat_wext_handle_ioctl(struct net *net, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; struct iw_request_info info; struct iwreq iwr; char *colon; int ret; if (copy_from_user(&iwr, argp, sizeof(struct iwreq))) return -EFAULT; iwr.ifr_name[IFNAMSIZ-1] = 0; colon = strchr(iwr.ifr_name, ':'); if (colon) *colon = 0; info.cmd = cmd; info.flags = IW_REQUEST_FLAG_COMPAT; ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info, compat_standard_call, compat_private_call); if (ret >= 0 && IW_IS_GET(cmd) && copy_to_user(argp, &iwr, sizeof(struct iwreq))) return -EFAULT; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg11570.12%133.33%
Jean Tourrilhes4728.66%133.33%
Arnaldo Carvalho de Melo21.22%133.33%
Total164100.00%3100.00%

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg103100.00%1100.00%
Total103100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg155100.00%1100.00%
Total155100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg102100.00%1100.00%
Total102100.00%1100.00%

EXPORT_SYMBOL(iwe_stream_add_value);

Overall Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg281856.72%1428.00%
Jean Tourrilhes95519.22%714.00%
Arnaldo Carvalho de Melo54310.93%36.00%
Linus Torvalds2394.81%24.00%
Joe Perches2084.19%36.00%
David S. Miller901.81%48.00%
Andrew Morton541.09%12.00%
Herbert Xu120.24%12.00%
John W. Linville90.18%12.00%
Julia Lawall80.16%12.00%
Thomas Graf60.12%24.00%
Arend Van Spriel60.12%12.00%
Tejun Heo30.06%12.00%
Paul Gortmaker30.06%12.00%
Eric Dumazet30.06%12.00%
Eric W. Biedermann20.04%12.00%
Alan Cox20.04%12.00%
Stephen Hemminger20.04%12.00%
Adrian Bunk20.04%12.00%
Hideaki Yoshifuji / 吉藤英明10.02%12.00%
Jamal Hadi Salim10.02%12.00%
Patrick McHardy10.02%12.00%
Total4968100.00%50100.00%
Directory: net/wireless
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