| 1 | /* |
| 2 | * Host AP crypto routines |
| 3 | * |
| 4 | * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| 5 | * Portions Copyright (C) 2004, Intel Corporation <jketreno@linux.intel.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. See README and COPYING for |
| 10 | * more details. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/errno.h> |
| 19 | |
| 20 | #include "rtllib.h" |
| 21 | |
| 22 | struct rtllib_crypto_alg { |
| 23 | struct list_head list; |
| 24 | struct lib80211_crypto_ops *ops; |
| 25 | }; |
| 26 | |
| 27 | |
| 28 | struct rtllib_crypto { |
| 29 | struct list_head algs; |
| 30 | spinlock_t lock; |
| 31 | }; |
| 32 | |
| 33 | static struct rtllib_crypto *hcrypt; |
| 34 | |
| 35 | void rtllib_crypt_deinit_entries(struct lib80211_crypt_info *info, |
| 36 | int force) |
| 37 | { |
| 38 | struct list_head *ptr, *n; |
| 39 | struct lib80211_crypt_data *entry; |
| 40 | |
| 41 | for (ptr = info->crypt_deinit_list.next, n = ptr->next; |
| 42 | ptr != &info->crypt_deinit_list; ptr = n, n = ptr->next) { |
| 43 | entry = list_entry(ptr, struct lib80211_crypt_data, list); |
| 44 | |
| 45 | if (atomic_read(&entry->refcnt) != 0 && !force) |
| 46 | continue; |
| 47 | |
| 48 | list_del(ptr); |
| 49 | |
| 50 | if (entry->ops) |
| 51 | entry->ops->deinit(entry->priv); |
| 52 | kfree(entry); |
| 53 | } |
| 54 | } |
| 55 | EXPORT_SYMBOL(rtllib_crypt_deinit_entries); |
| 56 | |
| 57 | void rtllib_crypt_deinit_handler(unsigned long data) |
| 58 | { |
| 59 | struct lib80211_crypt_info *info = (struct lib80211_crypt_info *)data; |
| 60 | unsigned long flags; |
| 61 | |
| 62 | spin_lock_irqsave(info->lock, flags); |
| 63 | rtllib_crypt_deinit_entries(info, 0); |
| 64 | if (!list_empty(&info->crypt_deinit_list)) { |
| 65 | printk(KERN_DEBUG "%s: entries remaining in delayed crypt " |
| 66 | "deletion list\n", info->name); |
| 67 | info->crypt_deinit_timer.expires = jiffies + HZ; |
| 68 | add_timer(&info->crypt_deinit_timer); |
| 69 | } |
| 70 | spin_unlock_irqrestore(info->lock, flags); |
| 71 | |
| 72 | } |
| 73 | EXPORT_SYMBOL(rtllib_crypt_deinit_handler); |
| 74 | |
| 75 | void rtllib_crypt_delayed_deinit(struct lib80211_crypt_info *info, |
| 76 | struct lib80211_crypt_data **crypt) |
| 77 | { |
| 78 | struct lib80211_crypt_data *tmp; |
| 79 | unsigned long flags; |
| 80 | |
| 81 | if (*crypt == NULL) |
| 82 | return; |
| 83 | |
| 84 | tmp = *crypt; |
| 85 | *crypt = NULL; |
| 86 | |
| 87 | /* must not run ops->deinit() while there may be pending encrypt or |
| 88 | * decrypt operations. Use a list of delayed deinits to avoid needing |
| 89 | * locking. */ |
| 90 | |
| 91 | spin_lock_irqsave(info->lock, flags); |
| 92 | list_add(&tmp->list, &info->crypt_deinit_list); |
| 93 | if (!timer_pending(&info->crypt_deinit_timer)) { |
| 94 | info->crypt_deinit_timer.expires = jiffies + HZ; |
| 95 | add_timer(&info->crypt_deinit_timer); |
| 96 | } |
| 97 | spin_unlock_irqrestore(info->lock, flags); |
| 98 | } |
| 99 | EXPORT_SYMBOL(rtllib_crypt_delayed_deinit); |
| 100 | |
| 101 | int rtllib_register_crypto_ops(struct lib80211_crypto_ops *ops) |
| 102 | { |
| 103 | unsigned long flags; |
| 104 | struct rtllib_crypto_alg *alg; |
| 105 | |
| 106 | if (hcrypt == NULL) |
| 107 | return -1; |
| 108 | |
| 109 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
| 110 | if (alg == NULL) |
| 111 | return -ENOMEM; |
| 112 | |
| 113 | alg->ops = ops; |
| 114 | |
| 115 | spin_lock_irqsave(&hcrypt->lock, flags); |
| 116 | list_add(&alg->list, &hcrypt->algs); |
| 117 | spin_unlock_irqrestore(&hcrypt->lock, flags); |
| 118 | |
| 119 | printk(KERN_DEBUG "rtllib_crypt: registered algorithm '%s'\n", |
| 120 | ops->name); |
| 121 | |
| 122 | return 0; |
| 123 | } |
| 124 | EXPORT_SYMBOL(rtllib_register_crypto_ops); |
| 125 | |
| 126 | int rtllib_unregister_crypto_ops(struct lib80211_crypto_ops *ops) |
| 127 | { |
| 128 | unsigned long flags; |
| 129 | struct list_head *ptr; |
| 130 | struct rtllib_crypto_alg *del_alg = NULL; |
| 131 | |
| 132 | if (hcrypt == NULL) |
| 133 | return -1; |
| 134 | |
| 135 | spin_lock_irqsave(&hcrypt->lock, flags); |
| 136 | for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) { |
| 137 | struct rtllib_crypto_alg *alg = |
| 138 | (struct rtllib_crypto_alg *) ptr; |
| 139 | if (alg->ops == ops) { |
| 140 | list_del(&alg->list); |
| 141 | del_alg = alg; |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | spin_unlock_irqrestore(&hcrypt->lock, flags); |
| 146 | |
| 147 | if (del_alg) { |
| 148 | printk(KERN_DEBUG "rtllib_crypt: unregistered algorithm " |
| 149 | "'%s'\n", ops->name); |
| 150 | kfree(del_alg); |
| 151 | } |
| 152 | |
| 153 | return del_alg ? 0 : -1; |
| 154 | } |
| 155 | EXPORT_SYMBOL(rtllib_unregister_crypto_ops); |
| 156 | |
| 157 | |
| 158 | struct lib80211_crypto_ops *rtllib_get_crypto_ops(const char *name) |
| 159 | { |
| 160 | unsigned long flags; |
| 161 | struct list_head *ptr; |
| 162 | struct rtllib_crypto_alg *found_alg = NULL; |
| 163 | |
| 164 | if (hcrypt == NULL) |
| 165 | return NULL; |
| 166 | |
| 167 | spin_lock_irqsave(&hcrypt->lock, flags); |
| 168 | for (ptr = hcrypt->algs.next; ptr != &hcrypt->algs; ptr = ptr->next) { |
| 169 | struct rtllib_crypto_alg *alg = |
| 170 | (struct rtllib_crypto_alg *) ptr; |
| 171 | if (strcmp(alg->ops->name, name) == 0) { |
| 172 | found_alg = alg; |
| 173 | break; |
| 174 | } |
| 175 | } |
| 176 | spin_unlock_irqrestore(&hcrypt->lock, flags); |
| 177 | |
| 178 | if (found_alg) |
| 179 | return found_alg->ops; |
| 180 | else |
| 181 | return NULL; |
| 182 | } |
| 183 | EXPORT_SYMBOL(rtllib_get_crypto_ops); |
| 184 | |
| 185 | |
| 186 | static void * rtllib_crypt_null_init(int keyidx) { return (void *) 1; } |
| 187 | static void rtllib_crypt_null_deinit(void *priv) {} |
| 188 | |
| 189 | static struct lib80211_crypto_ops rtllib_crypt_null = { |
| 190 | .name = "NULL", |
| 191 | .init = rtllib_crypt_null_init, |
| 192 | .deinit = rtllib_crypt_null_deinit, |
| 193 | .encrypt_mpdu = NULL, |
| 194 | .decrypt_mpdu = NULL, |
| 195 | .encrypt_msdu = NULL, |
| 196 | .decrypt_msdu = NULL, |
| 197 | .set_key = NULL, |
| 198 | .get_key = NULL, |
| 199 | .extra_mpdu_prefix_len = 0, |
| 200 | .extra_mpdu_postfix_len = 0, |
| 201 | .extra_msdu_prefix_len = 0, |
| 202 | .extra_msdu_postfix_len = 0, |
| 203 | .owner = THIS_MODULE, |
| 204 | }; |
| 205 | |
| 206 | |
| 207 | int __init rtllib_crypto_init(void) |
| 208 | { |
| 209 | int ret = -ENOMEM; |
| 210 | |
| 211 | hcrypt = kzalloc(sizeof(*hcrypt), GFP_KERNEL); |
| 212 | if (!hcrypt) |
| 213 | goto out; |
| 214 | |
| 215 | INIT_LIST_HEAD(&hcrypt->algs); |
| 216 | spin_lock_init(&hcrypt->lock); |
| 217 | |
| 218 | ret = lib80211_register_crypto_ops(&rtllib_crypt_null); |
| 219 | if (ret < 0) { |
| 220 | kfree(hcrypt); |
| 221 | hcrypt = NULL; |
| 222 | } |
| 223 | out: |
| 224 | return ret; |
| 225 | } |
| 226 | |
| 227 | |
| 228 | void __exit rtllib_crypto_deinit(void) |
| 229 | { |
| 230 | struct list_head *ptr, *n; |
| 231 | |
| 232 | if (hcrypt == NULL) |
| 233 | return; |
| 234 | |
| 235 | for (ptr = hcrypt->algs.next, n = ptr->next; ptr != &hcrypt->algs; |
| 236 | ptr = n, n = ptr->next) { |
| 237 | struct rtllib_crypto_alg *alg = |
| 238 | (struct rtllib_crypto_alg *) ptr; |
| 239 | list_del(ptr); |
| 240 | printk(KERN_DEBUG "rtllib_crypt: unregistered algorithm " |
| 241 | "'%s' (deinit)\n", alg->ops->name); |
| 242 | kfree(alg); |
| 243 | } |
| 244 | |
| 245 | kfree(hcrypt); |
| 246 | } |
| 247 | |
| 248 | module_init(rtllib_crypto_init); |
| 249 | module_exit(rtllib_crypto_deinit); |
| 250 | |
| 251 | MODULE_LICENSE("GPL"); |