cregit-Linux how code gets into the kernel

Release 4.8 net/wireless/core.c

Directory: net/wireless
/*
 * This is the linux wireless configuration interface.
 *
 * Copyright 2006-2010          Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright 2015       Intel Deutschland GmbH
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/nl80211.h>
#include <linux/debugfs.h>
#include <linux/notifier.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "nl80211.h"
#include "core.h"
#include "sysfs.h"
#include "debugfs.h"
#include "wext-compat.h"
#include "rdev-ops.h"

/* name for sysfs, %d is appended */

#define PHY_NAME "phy"

MODULE_AUTHOR("Johannes Berg");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("wireless configuration support");

MODULE_ALIAS_GENL_FAMILY(NL80211_GENL_NAME);

/* RCU-protected (and RTNL for writers) */

LIST_HEAD(cfg80211_rdev_list);

int cfg80211_rdev_list_generation;

/* for debugfs */

static struct dentry *ieee80211_debugfs_dir;

/* for the cleanup, scan and event works */

struct workqueue_struct *cfg80211_wq;


static bool cfg80211_disable_40mhz_24ghz;
module_param(cfg80211_disable_40mhz_24ghz, bool, 0644);
MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz,
		 "Disable 40MHz support in the 2.4GHz band");


struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) { struct cfg80211_registered_device *result = NULL, *rdev; ASSERT_RTNL(); list_for_each_entry(rdev, &cfg80211_rdev_list, list) { if (rdev->wiphy_idx == wiphy_idx) { result = rdev; break; } } return result; }

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luis r. rodriguezluis r. rodriguez59.80%240.00%
Total51100.00%5100.00%


int get_wiphy_idx(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); return rdev->wiphy_idx; }

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luis r. rodriguezluis r. rodriguez2080.00%125.00%
johannes bergjohannes berg416.00%250.00%
zhao gangzhao gang14.00%125.00%
Total25100.00%4100.00%


struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx) { struct cfg80211_registered_device *rdev; ASSERT_RTNL(); rdev = cfg80211_rdev_by_wiphy_idx(wiphy_idx); if (!rdev) return NULL; return &rdev->wiphy; }

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johannes bergjohannes berg615.38%266.67%
Total39100.00%3100.00%


static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev, const char *newname) { struct cfg80211_registered_device *rdev2; int wiphy_idx, taken = -1, digits; ASSERT_RTNL(); /* prohibit calling the thing phy%d when %d is not its number */ sscanf(newname, PHY_NAME "%d%n", &wiphy_idx, &taken); if (taken == strlen(newname) && wiphy_idx != rdev->wiphy_idx) { /* count number of places needed to print wiphy_idx */ digits = 1; while (wiphy_idx /= 10) digits++; /* * deny the name if it is phy<idx> where <idx> is printed * without leading zeroes. taken == strlen(newname) here */ if (taken == strlen(PHY_NAME) + digits) return -EINVAL; } /* Ensure another device does not already have this name. */ list_for_each_entry(rdev2, &cfg80211_rdev_list, list) if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0) return -EINVAL; return 0; }

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johannes bergjohannes berg9069.77%571.43%
eric w. biedermaneric w. biederman2015.50%114.29%
ben greearben greear1914.73%114.29%
Total129100.00%7100.00%


int cfg80211_dev_rename(struct cfg80211_registered_device *rdev, char *newname) { int result; ASSERT_RTNL(); /* Ignore nop renames */ if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0) return 0; result = cfg80211_dev_check_name(rdev, newname); if (result < 0) return result; result = device_rename(&rdev->wiphy.dev, newname); if (result) return result; if (rdev->wiphy.debugfsdir && !debugfs_rename(rdev->wiphy.debugfsdir->d_parent, rdev->wiphy.debugfsdir, rdev->wiphy.debugfsdir->d_parent, newname)) pr_err("failed to rename debugfs dir to %s!\n", newname); nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY); return 0; }

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johannes bergjohannes berg7556.39%457.14%
ben greearben greear4130.83%114.29%
eric w. biedermaneric w. biederman1511.28%114.29%
joe perchesjoe perches21.50%114.29%
Total133100.00%7100.00%


int cfg80211_switch_netns(struct cfg80211_registered_device *rdev, struct net *net) { struct wireless_dev *wdev; int err = 0; if (!(rdev->wiphy.flags & WIPHY_FLAG_NETNS_OK)) return -EOPNOTSUPP; list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { if (!wdev->netdev) continue; wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); if (err) break; wdev->netdev->features |= NETIF_F_NETNS_LOCAL; } if (err) { /* failed -- clean up to old netns */ net = wiphy_net(&rdev->wiphy); list_for_each_entry_continue_reverse(wdev, &rdev->wiphy.wdev_list, list) { if (!wdev->netdev) continue; wdev->netdev->features &= ~NETIF_F_NETNS_LOCAL; err = dev_change_net_namespace(wdev->netdev, net, "wlan%d"); WARN_ON(err); wdev->netdev->features |= NETIF_F_NETNS_LOCAL; } return err; } wiphy_net_set(&rdev->wiphy, net); err = device_rename(&rdev->wiphy.dev, dev_name(&rdev->wiphy.dev)); WARN_ON(err); return 0; }

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static void cfg80211_rfkill_poll(struct rfkill *rfkill, void *data) { struct cfg80211_registered_device *rdev = data; rdev_rfkill_poll(rdev); }

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hila gonenhila gonen13.70%133.33%
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void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, struct wireless_dev *wdev) { ASSERT_RTNL(); if (WARN_ON(wdev->iftype != NL80211_IFTYPE_P2P_DEVICE)) return; if (!wdev->p2p_started) return; rdev_stop_p2p_device(rdev, wdev); wdev->p2p_started = false; rdev->opencount--; if (rdev->scan_req && rdev->scan_req->wdev == wdev) { if (WARN_ON(!rdev->scan_req->notified)) rdev->scan_req->info.aborted = true; ___cfg80211_scan_done(rdev, false); } }

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johannes bergjohannes berg9998.02%583.33%
avraham sternavraham stern21.98%116.67%
Total101100.00%6100.00%


void cfg80211_shutdown_all_interfaces(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); struct wireless_dev *wdev; ASSERT_RTNL(); list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { if (wdev->netdev) { dev_close(wdev->netdev); continue; } /* otherwise, check iftype */ switch (wdev->iftype) { case NL80211_IFTYPE_P2P_DEVICE: cfg80211_stop_p2p_device(rdev, wdev); break; default: break; } } }

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EXPORT_SYMBOL_GPL(cfg80211_shutdown_all_interfaces);
static int cfg80211_rfkill_set_block(void *data, bool blocked) { struct cfg80211_registered_device *rdev = data; if (!blocked) return 0; rtnl_lock(); cfg80211_shutdown_all_interfaces(&rdev->wiphy); rtnl_unlock(); return 0; }

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static void cfg80211_rfkill_sync_work(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, rfkill_sync); cfg80211_rfkill_set_block(rdev, rfkill_blocked(rdev->rfkill)); }

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johannes bergjohannes berg40100.00%2100.00%
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static void cfg80211_event_work(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, event_work); rtnl_lock(); cfg80211_process_rdev_events(rdev); rtnl_unlock(); }

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void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev) { struct cfg80211_iface_destroy *item; ASSERT_RTNL(); spin_lock_irq(&rdev->destroy_list_lock); while ((item = list_first_entry_or_null(&rdev->destroy_list, struct cfg80211_iface_destroy, list))) { struct wireless_dev *wdev, *tmp; u32 nlportid = item->nlportid; list_del(&item->list); kfree(item); spin_unlock_irq(&rdev->destroy_list_lock); list_for_each_entry_safe(wdev, tmp, &rdev->wiphy.wdev_list, list) { if (nlportid == wdev->owner_nlportid) rdev_del_virtual_intf(rdev, wdev); } spin_lock_irq(&rdev->destroy_list_lock); } spin_unlock_irq(&rdev->destroy_list_lock); }

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static void cfg80211_destroy_iface_wk(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, destroy_work); rtnl_lock(); cfg80211_destroy_ifaces(rdev); rtnl_unlock(); }

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static void cfg80211_sched_scan_stop_wk(struct work_struct *work) { struct cfg80211_registered_device *rdev; rdev = container_of(work, struct cfg80211_registered_device, sched_scan_stop_wk); rtnl_lock(); __cfg80211_stop_sched_scan(rdev, false); rtnl_unlock(); }

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jukka rissanenjukka rissanen41100.00%1100.00%
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/* exported functions */
struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, const char *requested_name) { static atomic_t wiphy_counter = ATOMIC_INIT(0); struct cfg80211_registered_device *rdev; int alloc_size; WARN_ON(ops->add_key && (!ops->del_key || !ops->set_default_key)); WARN_ON(ops->auth && (!ops->assoc || !ops->deauth || !ops->disassoc)); WARN_ON(ops->connect && !ops->disconnect); WARN_ON(ops->join_ibss && !ops->leave_ibss); WARN_ON(ops->add_virtual_intf && !ops->del_virtual_intf); WARN_ON(ops->add_station && !ops->del_station); WARN_ON(ops->add_mpath && !ops->del_mpath); WARN_ON(ops->join_mesh && !ops->leave_mesh); WARN_ON(ops->start_p2p_device && !ops->stop_p2p_device); WARN_ON(ops->start_ap && !ops->stop_ap); WARN_ON(ops->join_ocb && !ops->leave_ocb); WARN_ON(ops->suspend && !ops->resume); WARN_ON(ops->sched_scan_start && !ops->sched_scan_stop); WARN_ON(ops->remain_on_channel && !ops->cancel_remain_on_channel); WARN_ON(ops->tdls_channel_switch && !ops->tdls_cancel_channel_switch); WARN_ON(ops->add_tx_ts && !ops->del_tx_ts); alloc_size = sizeof(*rdev) + sizeof_priv; rdev = kzalloc(alloc_size, GFP_KERNEL); if (!rdev) return NULL; rdev->ops = ops; rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); if (unlikely(rdev->wiphy_idx < 0)) { /* ugh, wrapped! */ atomic_dec(&wiphy_counter); kfree(rdev); return NULL; } /* atomic_inc_return makes it start at 1, make it start at 0 */ rdev->wiphy_idx--; /* give it a proper name */ if (requested_name && requested_name[0]) { int rv; rtnl_lock(); rv = cfg80211_dev_check_name(rdev, requested_name); if (rv < 0) { rtnl_unlock(); goto use_default_name; } rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name); rtnl_unlock(); if (rv) goto use_default_name; } else { use_default_name: /* NOTE: This is *probably* safe w/out holding rtnl because of * the restrictions on phy names. Probably this call could * fail if some other part of the kernel (re)named a device * phyX. But, might should add some locking and check return * value, and use a different name if this one exists? */ dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); } INIT_LIST_HEAD(&rdev->wiphy.wdev_list); INIT_LIST_HEAD(&rdev->beacon_registrations); spin_lock_init(&rdev->beacon_registrations_lock); spin_lock_init(&rdev->bss_lock); INIT_LIST_HEAD(&rdev->bss_list); INIT_WORK(&rdev->scan_done_wk, __cfg80211_scan_done); INIT_WORK(&rdev->sched_scan_results_wk, __cfg80211_sched_scan_results); INIT_LIST_HEAD(&rdev->mlme_unreg); spin_lock_init(&rdev->mlme_unreg_lock); INIT_WORK(&rdev->mlme_unreg_wk, cfg80211_mlme_unreg_wk); INIT_DELAYED_WORK(&rdev->dfs_update_channels_wk, cfg80211_dfs_channels_update_work); #ifdef CONFIG_CFG80211_WEXT rdev->wiphy.wext = &cfg80211_wext_handler; #endif device_initialize(&rdev->wiphy.dev); rdev->wiphy.dev.class = &ieee80211_class; rdev->wiphy.dev.platform_data = rdev; device_enable_async_suspend(&rdev->wiphy.dev); INIT_LIST_HEAD(&rdev->destroy_list); spin_lock_init(&rdev->destroy_list_lock); INIT_WORK(&rdev->destroy_work, cfg80211_destroy_iface_wk); INIT_WORK(&rdev->sched_scan_stop_wk, cfg80211_sched_scan_stop_wk); #ifdef CONFIG_CFG80211_DEFAULT_PS rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; #endif wiphy_net_set(&rdev->wiphy, &init_net); rdev->rfkill_ops.set_block = cfg80211_rfkill_set_block; rdev->rfkill = rfkill_alloc(dev_name(&rdev->wiphy.dev), &rdev->wiphy.dev, RFKILL_TYPE_WLAN, &rdev->rfkill_ops, rdev); if (!rdev->rfkill) { kfree(rdev); return NULL; } INIT_WORK(&rdev->rfkill_sync, cfg80211_rfkill_sync_work); INIT_WORK(&rdev->conn_work, cfg80211_conn_work); INIT_WORK(&rdev->event_work, cfg80211_event_work); init_waitqueue_head(&rdev->dev_wait); /* * Initialize wiphy parameters to IEEE 802.11 MIB default values. * Fragmentation and RTS threshold are disabled by default with the * special -1 value. */ rdev->wiphy.retry_short = 7; rdev->wiphy.retry_long = 4; rdev->wiphy.frag_threshold = (u32) -1; rdev->wiphy.rts_threshold = (u32) -1; rdev->wiphy.coverage_class = 0; rdev->wiphy.max_num_csa_counters = 1; rdev->wiphy.max_sched_scan_plans = 1; rdev->wiphy.max_sched_scan_plan_interval = U32_MAX; return &rdev->wiphy; }

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johannes bergjohannes berg49361.32%2360.53%
ola olssonola olsson9611.94%12.63%
ben greearben greear9411.69%25.26%
jouni malinenjouni malinen374.60%12.63%
avraham sternavraham stern161.99%12.63%
fu zhonghuifu zhonghui101.24%12.63%
simon wunderlichsimon wunderlich101.24%12.63%
jukka rissanenjukka rissanen101.24%12.63%
luciano coelholuciano coelho101.24%12.63%
andrei otcheretianskiandrei otcheretianski81.00%12.63%
lukas tureklukas turek81.00%12.63%
cheng renquancheng renquan70.87%12.63%
kay sieverskay sievers20.25%12.63%
luis r. rodriguezluis r. rodriguez20.25%12.63%
david kilroydavid kilroy10.12%12.63%
Total804100.00%38100.00%

EXPORT_SYMBOL(wiphy_new_nm);
static int wiphy_verify_combinations(struct wiphy *wiphy) { const struct ieee80211_iface_combination *c; int i, j; for (i = 0; i < wiphy->n_iface_combinations; i++) { u32 cnt = 0; u16 all_iftypes = 0; c = &wiphy->iface_combinations[i]; /* * Combinations with just one interface aren't real, * however we make an exception for DFS. */ if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths)) return -EINVAL; /* Need at least one channel */ if (WARN_ON(!c->num_different_channels)) return -EINVAL; /* * Put a sane limit on maximum number of different * channels to simplify channel accounting code. */ if (WARN_ON(c->num_different_channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS)) return -EINVAL; /* DFS only works on one channel. */ if (WARN_ON(c->radar_detect_widths && (c->num_different_channels > 1))) return -EINVAL; if (WARN_ON(!c->n_limits)) return -EINVAL; for (j = 0; j < c->n_limits; j++) { u16 types = c->limits[j].types; /* interface types shouldn't overlap */ if (WARN_ON(types & all_iftypes)) return -EINVAL; all_iftypes |= types; if (WARN_ON(!c->limits[j].max)) return -EINVAL; /* Shouldn't list software iftypes in combinations! */ if (WARN_ON(wiphy->software_iftypes & types)) return -EINVAL; /* Only a single P2P_DEVICE can be allowed */ if (WARN_ON(types & BIT(NL80211_IFTYPE_P2P_DEVICE) && c->limits[j].max > 1)) return -EINVAL; cnt += c->limits[j].max; /* * Don't advertise an unsupported type * in a combination. */ if (WARN_ON((wiphy->interface_modes & types) != types)) return -EINVAL; } /* You can't even choose that many! */ if (WARN_ON(cnt < c->max_interfaces)) return -EINVAL; } return 0; }

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johannes bergjohannes berg26284.79%240.00%
simon wunderlichsimon wunderlich309.71%120.00%
michal kaziormichal kazior165.18%120.00%
luciano coelholuciano coelho10.32%120.00%
Total309100.00%5100.00%


int wiphy_register(struct wiphy *wiphy) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); int res; enum nl80211_band band; struct ieee80211_supported_band *sband; bool have_band = false; int i; u16 ifmodes = wiphy->interface_modes; #ifdef CONFIG_PM if (WARN_ON(wiphy->wowlan && (wiphy->wowlan->flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE) && !(wiphy->wowlan->flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY))) return -EINVAL; if (WARN_ON(wiphy->wowlan && !wiphy->wowlan->flags && !wiphy->wowlan->n_patterns && !wiphy->wowlan->tcp)) return -EINVAL; #endif if (WARN_ON((wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH) && (!rdev->ops->tdls_channel_switch || !rdev->ops->tdls_cancel_channel_switch))) return -EINVAL; /* * if a wiphy has unsupported modes for regulatory channel enforcement, * opt-out of enforcement checking */ if (wiphy->interface_modes & ~(BIT(NL80211_IFTYPE_STATION) | BIT(NL80211_IFTYPE_P2P_CLIENT) | BIT(NL80211_IFTYPE_AP) | BIT(NL80211_IFTYPE_P2P_GO) | BIT(NL80211_IFTYPE_ADHOC) | BIT(NL80211_IFTYPE_P2P_DEVICE) | BIT(NL80211_IFTYPE_AP_VLAN) | BIT(NL80211_IFTYPE_MONITOR))) wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF; if (WARN_ON((wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) && (wiphy->regulatory_flags & (REGULATORY_CUSTOM_REG | REGULATORY_STRICT_REG | REGULATORY_COUNTRY_IE_FOLLOW_POWER | REGULATORY_COUNTRY_IE_IGNORE)))) return -EINVAL; if (WARN_ON(wiphy->coalesce && (!wiphy->coalesce->n_rules || !wiphy->coalesce->n_patterns) && (!wiphy->coalesce->pattern_min_len || wiphy->coalesce->pattern_min_len > wiphy->coalesce->pattern_max_len))) return -EINVAL; if (WARN_ON(wiphy->ap_sme_capa && !(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME))) return -EINVAL; if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) return -EINVAL; if (WARN_ON(wiphy->addresses && !is_zero_ether_addr(wiphy->perm_addr) && memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN))) return -EINVAL; if (WARN_ON(wiphy->max_acl_mac_addrs && (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) || !rdev->ops->set_mac_acl))) return -EINVAL; /* assure only valid behaviours are flagged by driver * hence subtract 2 as bit 0 is invalid. */ if (WARN_ON(wiphy->bss_select_support && (wiphy->bss_select_support & ~(BIT(__NL80211_BSS_SELECT_ATTR_AFTER_LAST) - 2)))) return -EINVAL; if (wiphy->addresses) memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); /* sanity check ifmodes */ WARN_ON(!ifmodes); ifmodes &= ((1 << NUM_NL80211_IFTYPES) - 1) & ~1; if (WARN_ON(ifmodes != wiphy->interface_modes)) wiphy->interface_modes = ifmodes; res = wiphy_verify_combinations(wiphy); if (res) return res; /* sanity check supported bands/channels */ for (band = 0; band < NUM_NL80211_BANDS; band++