^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * T10 Data Integrity Field CRC16 calculation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2007 Oracle Corporation. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Written by Martin K. Petersen <martin.petersen@oracle.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/crc-t10dif.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <crypto/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <crypto/algapi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/static_key.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static struct crypto_shash __rcu *crct10dif_tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static DEFINE_STATIC_KEY_TRUE(crct10dif_fallback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static DEFINE_MUTEX(crc_t10dif_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static struct work_struct crct10dif_rehash_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int crc_t10dif_notify(struct notifier_block *self, unsigned long val, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct crypto_alg *alg = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) if (val != CRYPTO_MSG_ALG_LOADED ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) strcmp(alg->cra_name, CRC_T10DIF_STRING))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) schedule_work(&crct10dif_rehash_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void crc_t10dif_rehash(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct crypto_shash *new, *old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) mutex_lock(&crc_t10dif_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) old = rcu_dereference_protected(crct10dif_tfm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) lockdep_is_held(&crc_t10dif_mutex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) new = crypto_alloc_shash(CRC_T10DIF_STRING, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (IS_ERR(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) mutex_unlock(&crc_t10dif_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) rcu_assign_pointer(crct10dif_tfm, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) mutex_unlock(&crc_t10dif_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (old) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) synchronize_rcu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) crypto_free_shash(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static_branch_disable(&crct10dif_fallback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static struct notifier_block crc_t10dif_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) .notifier_call = crc_t10dif_notify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) __u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct shash_desc shash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) __u16 crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) } desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (static_branch_unlikely(&crct10dif_fallback))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return crc_t10dif_generic(crc, buffer, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) desc.shash.tfm = rcu_dereference(crct10dif_tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) desc.crc = crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) err = crypto_shash_update(&desc.shash, buffer, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) BUG_ON(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return desc.crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) EXPORT_SYMBOL(crc_t10dif_update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) __u16 crc_t10dif(const unsigned char *buffer, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return crc_t10dif_update(0, buffer, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) EXPORT_SYMBOL(crc_t10dif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static int __init crc_t10dif_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) INIT_WORK(&crct10dif_rehash_work, crc_t10dif_rehash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) crypto_register_notifier(&crc_t10dif_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) crc_t10dif_rehash(&crct10dif_rehash_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static void __exit crc_t10dif_mod_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) crypto_unregister_notifier(&crc_t10dif_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) cancel_work_sync(&crct10dif_rehash_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) crypto_free_shash(rcu_dereference_protected(crct10dif_tfm, 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) module_init(crc_t10dif_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) module_exit(crc_t10dif_mod_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int crc_t10dif_transform_show(char *buffer, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct crypto_shash *tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (static_branch_unlikely(&crct10dif_fallback))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return sprintf(buffer, "fallback\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) tfm = rcu_dereference(crct10dif_tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) len = snprintf(buffer, PAGE_SIZE, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) crypto_shash_driver_name(tfm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) module_param_call(transform, NULL, crc_t10dif_transform_show, NULL, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) MODULE_DESCRIPTION("T10 DIF CRC calculation (library API)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) MODULE_SOFTDEP("pre: crct10dif");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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