diff options
Diffstat (limited to 'drivers/net/wireless/intel/ipw2x00/libipw_crypto.c')
| -rw-r--r-- | drivers/net/wireless/intel/ipw2x00/libipw_crypto.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/ipw2x00/libipw_crypto.c b/drivers/net/wireless/intel/ipw2x00/libipw_crypto.c new file mode 100644 index 000000000000..dfcc12aa8620 --- /dev/null +++ b/drivers/net/wireless/intel/ipw2x00/libipw_crypto.c @@ -0,0 +1,246 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * libipw -- common bits for IPW 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> + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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 "libipw.h" + +struct libipw_crypto_alg { + struct list_head list; + const struct libipw_crypto_ops *ops; +}; + +static LIST_HEAD(libipw_crypto_algs); +static DEFINE_SPINLOCK(libipw_crypto_lock); + +static void libipw_crypt_deinit_entries(struct libipw_crypt_info *info, + int force); +static void libipw_crypt_quiescing(struct libipw_crypt_info *info); +static void libipw_crypt_deinit_handler(struct timer_list *t); + +int libipw_crypt_info_init(struct libipw_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); + timer_setup(&info->crypt_deinit_timer, libipw_crypt_deinit_handler, + 0); + + return 0; +} +EXPORT_SYMBOL(libipw_crypt_info_init); + +void libipw_crypt_info_free(struct libipw_crypt_info *info) +{ + int i; + + libipw_crypt_quiescing(info); + timer_delete_sync(&info->crypt_deinit_timer); + libipw_crypt_deinit_entries(info, 1); + + for (i = 0; i < NUM_WEP_KEYS; i++) { + struct libipw_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(libipw_crypt_info_free); + +static void libipw_crypt_deinit_entries(struct libipw_crypt_info *info, + int force) +{ + struct libipw_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); +} + +/* After this, crypt_deinit_list won't accept new members */ +static void libipw_crypt_quiescing(struct libipw_crypt_info *info) +{ + unsigned long flags; + + spin_lock_irqsave(info->lock, flags); + info->crypt_quiesced = 1; + spin_unlock_irqrestore(info->lock, flags); +} + +static void libipw_crypt_deinit_handler(struct timer_list *t) +{ + struct libipw_crypt_info *info = from_timer(info, t, + crypt_deinit_timer); + unsigned long flags; + + libipw_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); +} + +void libipw_crypt_delayed_deinit(struct libipw_crypt_info *info, + struct libipw_crypt_data **crypt) +{ + struct libipw_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(libipw_crypt_delayed_deinit); + +int libipw_register_crypto_ops(const struct libipw_crypto_ops *ops) +{ + unsigned long flags; + struct libipw_crypto_alg *alg; + + alg = kzalloc(sizeof(*alg), GFP_KERNEL); + if (alg == NULL) + return -ENOMEM; + + alg->ops = ops; + + spin_lock_irqsave(&libipw_crypto_lock, flags); + list_add(&alg->list, &libipw_crypto_algs); + spin_unlock_irqrestore(&libipw_crypto_lock, flags); + + printk(KERN_DEBUG "libipw_crypt: registered algorithm '%s'\n", + ops->name); + + return 0; +} +EXPORT_SYMBOL(libipw_register_crypto_ops); + +int libipw_unregister_crypto_ops(const struct libipw_crypto_ops *ops) +{ + struct libipw_crypto_alg *alg; + unsigned long flags; + + spin_lock_irqsave(&libipw_crypto_lock, flags); + list_for_each_entry(alg, &libipw_crypto_algs, list) { + if (alg->ops == ops) + goto found; + } + spin_unlock_irqrestore(&libipw_crypto_lock, flags); + return -EINVAL; + + found: + printk(KERN_DEBUG "libipw_crypt: unregistered algorithm '%s'\n", + ops->name); + list_del(&alg->list); + spin_unlock_irqrestore(&libipw_crypto_lock, flags); + kfree(alg); + return 0; +} +EXPORT_SYMBOL(libipw_unregister_crypto_ops); + +const struct libipw_crypto_ops *libipw_get_crypto_ops(const char *name) +{ + struct libipw_crypto_alg *alg; + unsigned long flags; + + spin_lock_irqsave(&libipw_crypto_lock, flags); + list_for_each_entry(alg, &libipw_crypto_algs, list) { + if (strcmp(alg->ops->name, name) == 0) + goto found; + } + spin_unlock_irqrestore(&libipw_crypto_lock, flags); + return NULL; + + found: + spin_unlock_irqrestore(&libipw_crypto_lock, flags); + return alg->ops; +} +EXPORT_SYMBOL(libipw_get_crypto_ops); + +static void *libipw_crypt_null_init(int keyidx) +{ + return (void *)1; +} + +static void libipw_crypt_null_deinit(void *priv) +{ +} + +static const struct libipw_crypto_ops libipw_crypt_null = { + .name = "NULL", + .init = libipw_crypt_null_init, + .deinit = libipw_crypt_null_deinit, + .owner = THIS_MODULE, +}; + +int __init libipw_crypto_init(void) +{ + return libipw_register_crypto_ops(&libipw_crypt_null); +} + +void libipw_crypto_exit(void) +{ + libipw_unregister_crypto_ops(&libipw_crypt_null); + BUG_ON(!list_empty(&libipw_crypto_algs)); +} |