/* * lib80211 -- common bits for IEEE802.11 drivers * * Copyright(c) 2008 John W. Linville <linville@tuxdriver.com> * * Portions copied from old ieee80211 component, w/ original copyright * notices below: * * Host AP crypto routines * * Copyright (c) 2002-2003, Jouni Malinen <j@w1.fi> * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com> * */ #include <linux/module.h> #include <linux/ctype.h> #include <linux/ieee80211.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/string.h> #include <net/lib80211.h> #define DRV_NAME "lib80211" #define DRV_DESCRIPTION "common routines for IEEE802.11 drivers" MODULE_DESCRIPTION(DRV_DESCRIPTION); MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); MODULE_LICENSE("GPL"); struct lib80211_crypto_alg { struct list_head list; struct lib80211_crypto_ops *ops; }; static LIST_HEAD(lib80211_crypto_algs); static DEFINE_SPINLOCK(lib80211_crypto_lock); const char *print_ssid(char *buf, const char *ssid, u8 ssid_len) { const char *s = ssid; char *d = buf; ssid_len = min_t(u8, ssid_len, IEEE80211_MAX_SSID_LEN); while (ssid_len--) { if (isprint(*s)) { *d++ = *s++; continue; } *d++ = '\\'; if (*s == '\0') *d++ = '0'; else if (*s == '\n') *d++ = 'n'; else if (*s == '\r') *d++ = 'r'; else if (*s == '\t') *d++ = 't'; else if (*s == '\\') *d++ = '\\'; else d += snprintf(d, 3, "%03o", *s); s++; } *d = '\0'; return buf; } EXPORT_SYMBOL(print_ssid); int lib80211_crypt_info_init(struct lib80211_crypt_info *info, char *name, spinlock_t *lock) { memset(info, 0, sizeof(*info)); info->name = name; info->lock = lock; INIT_LIST_HEAD(&info->crypt_deinit_list); setup_timer(&info->crypt_deinit_timer, lib80211_crypt_deinit_handler, (unsigned long)info); return 0; } EXPORT_SYMBOL(lib80211_crypt_info_init); void lib80211_crypt_info_free(struct lib80211_crypt_info *info) { int i; lib80211_crypt_quiescing(info); del_timer_sync(&info->crypt_deinit_timer); lib80211_crypt_deinit_entries(info, 1); for (i = 0; i < NUM_WEP_KEYS; i++) { struct lib80211_crypt_data *crypt = info->crypt[i]; if (crypt) { if (crypt->ops) { crypt->ops->deinit(crypt->priv); module_put(crypt->ops->owner); } kfree(crypt); info->crypt[i] = NULL; } } } EXPORT_SYMBOL(lib80211_crypt_info_free); void lib80211_crypt_deinit_entries(struct lib80211_crypt_info *info, int force) { struct lib80211_crypt_data *entry, *next; unsigned long flags; spin_lock_irqsave(info->lock, flags); list_for_each_entry_safe(entry, next, &info->crypt_deinit_list, list) { if (atomic_read(&entry->refcnt) != 0 && !force) continue; list_del(&entry->list); if (entry->ops) { entry->ops->deinit(entry->priv); module_put(entry->ops->owner); } kfree(entry); } spin_unlock_irqrestore(info->lock, flags); } EXPORT_SYMBOL(lib80211_crypt_deinit_entries); /* After this, crypt_deinit_list won't accept new members */ void lib80211_crypt_quiescing(struct lib80211_crypt_info *info) { unsigned long flags; spin_lock_irqsave(info->lock, flags); info->crypt_quiesced = 1; spin_unlock_irqrestore(info->lock, flags); } EXPORT_SYMBOL(lib80211_crypt_quiescing); void lib80211_crypt_deinit_handler(unsigned long data) { struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data; unsigned long flags; lib80211_crypt_deinit_entries(info, 0); spin_lock_irqsave(info->lock, flags); if (!list_empty(&info->crypt_deinit_list) && !info->crypt_quiesced) { printk(KERN_DEBUG "%s: entries remaining in delayed crypt " "deletion list\n", info->name); info->crypt_deinit_timer.expires = jiffies + HZ; add_timer(&info->crypt_deinit_timer); } spin_unlock_irqrestore(info->lock, flags); } EXPORT_SYMBOL(lib80211_crypt_deinit_handler); void lib80211_crypt_delayed_deinit(struct lib80211_crypt_info *info, struct lib80211_crypt_data **crypt) { struct lib80211_crypt_data *tmp; unsigned long flags; if (*crypt == NULL) return; tmp = *crypt; *crypt = NULL; /* must not run ops->deinit() while there may be pending encrypt or * decrypt operations. Use a list of delayed deinits to avoid needing * locking. */ spin_lock_irqsave(info->lock, flags); if (!info->crypt_quiesced) { list_add(&tmp->list, &info->crypt_deinit_list); if (!timer_pending(&info->crypt_deinit_timer)) { info->crypt_deinit_timer.expires = jiffies + HZ; add_timer(&info->crypt_deinit_timer); } } spin_unlock_irqrestore(info->lock, flags); } EXPORT_SYMBOL(lib80211_crypt_delayed_deinit); int lib80211_register_crypto_ops(struct lib80211_crypto_ops *ops) { unsigned long flags; struct lib80211_crypto_alg *alg; alg = kzalloc(sizeof(*alg), GFP_KERNEL); if (alg == NULL) return -ENOMEM; alg->ops = ops; spin_lock_irqsave(&lib80211_crypto_lock, flags); list_add(&alg->list, &lib80211_crypto_algs); spin_unlock_irqrestore(&lib80211_crypto_lock, flags); printk(KERN_DEBUG "lib80211_crypt: registered algorithm '%s'\n", ops->name); return 0; } EXPORT_SYMBOL(lib80211_register_crypto_ops); int lib80211_unregister_crypto_ops(struct lib80211_crypto_ops *ops) { struct lib80211_crypto_alg *alg; unsigned long flags; spin_lock_irqsave(&lib80211_crypto_lock, flags); list_for_each_entry(alg, &lib80211_crypto_algs, list) { if (alg->ops == ops) goto found; } spin_unlock_irqrestore(&lib80211_crypto_lock, flags); return -EINVAL; found: printk(KERN_DEBUG "lib80211_crypt: unregistered algorithm " "'%s'\n", ops->name); list_del(&alg->list); spin_unlock_irqrestore(&lib80211_crypto_lock, flags); kfree(alg); return 0; } EXPORT_SYMBOL(lib80211_unregister_crypto_ops); struct lib80211_crypto_ops *lib80211_get_crypto_ops(const char *name) { struct lib80211_crypto_alg *alg; unsigned long flags; spin_lock_irqsave(&lib80211_crypto_lock, flags); list_for_each_entry(alg, &lib80211_crypto_algs, list) { if (strcmp(alg->ops->name, name) == 0) goto found; } spin_unlock_irqrestore(&lib80211_crypto_lock, flags); return NULL; found: spin_unlock_irqrestore(&lib80211_crypto_lock, flags); return alg->ops; } EXPORT_SYMBOL(lib80211_get_crypto_ops); static void *lib80211_crypt_null_init(int keyidx) { return (void *)1; } static void lib80211_crypt_null_deinit(void *priv) { } static struct lib80211_crypto_ops lib80211_crypt_null = { .name = "NULL", .init = lib80211_crypt_null_init, .deinit = lib80211_crypt_null_deinit, .owner = THIS_MODULE, }; static int __init lib80211_init(void) { printk(KERN_INFO DRV_NAME ": " DRV_DESCRIPTION "\n"); return lib80211_register_crypto_ops(&lib80211_crypt_null); } static void __exit lib80211_exit(void) { lib80211_unregister_crypto_ops(&lib80211_crypt_null); BUG_ON(!list_empty(&lib80211_crypto_algs)); } module_init(lib80211_init); module_exit(lib80211_exit);