782 lines
14 KiB
C
782 lines
14 KiB
C
/*
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* xfrm algorithm interface
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pfkeyv2.h>
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#include <net/xfrm.h>
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#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE)
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#include <net/ah.h>
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#endif
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#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
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#include <net/esp.h>
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#endif
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/*
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* Algorithms supported by IPsec. These entries contain properties which
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* are used in key negotiation and xfrm processing, and are used to verify
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* that instantiated crypto transforms have correct parameters for IPsec
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* purposes.
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*/
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static struct xfrm_algo_desc aead_list[] = {
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{
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.name = "rfc4106(gcm(aes))",
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.uinfo = {
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.aead = {
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.icv_truncbits = 64,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "rfc4106(gcm(aes))",
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.uinfo = {
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.aead = {
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.icv_truncbits = 96,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "rfc4106(gcm(aes))",
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.uinfo = {
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.aead = {
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.icv_truncbits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "rfc4309(ccm(aes))",
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.uinfo = {
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.aead = {
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.icv_truncbits = 64,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "rfc4309(ccm(aes))",
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.uinfo = {
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.aead = {
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.icv_truncbits = 96,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "rfc4309(ccm(aes))",
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.uinfo = {
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.aead = {
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.icv_truncbits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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};
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static struct xfrm_algo_desc aalg_list[] = {
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{
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.name = "digest_null",
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.uinfo = {
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.auth = {
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.icv_truncbits = 0,
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.icv_fullbits = 0,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_AALG_NULL,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 0,
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.sadb_alg_maxbits = 0
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}
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},
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{
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.name = "hmac(md5)",
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.compat = "md5",
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.uinfo = {
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.auth = {
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.icv_truncbits = 96,
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.icv_fullbits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_AALG_MD5HMAC,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 128
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}
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},
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{
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.name = "hmac(sha1)",
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.compat = "sha1",
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.uinfo = {
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.auth = {
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.icv_truncbits = 96,
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.icv_fullbits = 160,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_AALG_SHA1HMAC,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 160,
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.sadb_alg_maxbits = 160
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}
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},
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{
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.name = "hmac(sha256)",
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.compat = "sha256",
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.uinfo = {
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.auth = {
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.icv_truncbits = 96,
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.icv_fullbits = 256,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_AALG_SHA2_256HMAC,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 256,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "hmac(rmd160)",
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.compat = "rmd160",
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.uinfo = {
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.auth = {
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.icv_truncbits = 96,
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.icv_fullbits = 160,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 160,
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.sadb_alg_maxbits = 160
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}
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},
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{
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.name = "xcbc(aes)",
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.uinfo = {
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.auth = {
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.icv_truncbits = 96,
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.icv_fullbits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 128
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}
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},
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};
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static struct xfrm_algo_desc ealg_list[] = {
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{
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.name = "ecb(cipher_null)",
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.compat = "cipher_null",
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.uinfo = {
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.encr = {
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.blockbits = 8,
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.defkeybits = 0,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_EALG_NULL,
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.sadb_alg_ivlen = 0,
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.sadb_alg_minbits = 0,
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.sadb_alg_maxbits = 0
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}
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},
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{
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.name = "cbc(des)",
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.compat = "des",
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.uinfo = {
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.encr = {
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.blockbits = 64,
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.defkeybits = 64,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_EALG_DESCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 64,
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.sadb_alg_maxbits = 64
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}
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},
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{
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.name = "cbc(des3_ede)",
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.compat = "des3_ede",
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.uinfo = {
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.encr = {
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.blockbits = 64,
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.defkeybits = 192,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_EALG_3DESCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 192,
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.sadb_alg_maxbits = 192
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}
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},
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{
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.name = "cbc(cast128)",
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.compat = "cast128",
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.uinfo = {
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.encr = {
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.blockbits = 64,
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.defkeybits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_CASTCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 40,
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.sadb_alg_maxbits = 128
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}
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},
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{
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.name = "cbc(blowfish)",
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.compat = "blowfish",
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.uinfo = {
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.encr = {
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.blockbits = 64,
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.defkeybits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_BLOWFISHCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 40,
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.sadb_alg_maxbits = 448
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}
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},
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{
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.name = "cbc(aes)",
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.compat = "aes",
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.uinfo = {
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.encr = {
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.blockbits = 128,
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.defkeybits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AESCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "cbc(serpent)",
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.compat = "serpent",
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.uinfo = {
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.encr = {
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.blockbits = 128,
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.defkeybits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_SERPENTCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256,
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}
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},
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{
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.name = "cbc(camellia)",
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.uinfo = {
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.encr = {
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.blockbits = 128,
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.defkeybits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_CAMELLIACBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "cbc(twofish)",
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.compat = "twofish",
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.uinfo = {
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.encr = {
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.blockbits = 128,
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.defkeybits = 128,
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_TWOFISHCBC,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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{
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.name = "rfc3686(ctr(aes))",
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.uinfo = {
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.encr = {
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.blockbits = 128,
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.defkeybits = 160, /* 128-bit key + 32-bit nonce */
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}
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},
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.desc = {
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.sadb_alg_id = SADB_X_EALG_AESCTR,
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.sadb_alg_ivlen = 8,
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.sadb_alg_minbits = 128,
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.sadb_alg_maxbits = 256
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}
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},
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};
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static struct xfrm_algo_desc calg_list[] = {
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{
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.name = "deflate",
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.uinfo = {
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.comp = {
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.threshold = 90,
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}
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},
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.desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE }
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},
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{
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.name = "lzs",
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.uinfo = {
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.comp = {
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.threshold = 90,
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}
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},
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.desc = { .sadb_alg_id = SADB_X_CALG_LZS }
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},
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{
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.name = "lzjh",
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.uinfo = {
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.comp = {
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.threshold = 50,
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}
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},
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.desc = { .sadb_alg_id = SADB_X_CALG_LZJH }
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},
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};
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static inline int aead_entries(void)
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{
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return ARRAY_SIZE(aead_list);
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}
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static inline int aalg_entries(void)
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{
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return ARRAY_SIZE(aalg_list);
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}
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static inline int ealg_entries(void)
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{
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return ARRAY_SIZE(ealg_list);
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}
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static inline int calg_entries(void)
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{
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return ARRAY_SIZE(calg_list);
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}
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struct xfrm_algo_list {
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struct xfrm_algo_desc *algs;
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int entries;
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u32 type;
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u32 mask;
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};
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static const struct xfrm_algo_list xfrm_aead_list = {
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.algs = aead_list,
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.entries = ARRAY_SIZE(aead_list),
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.type = CRYPTO_ALG_TYPE_AEAD,
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.mask = CRYPTO_ALG_TYPE_MASK,
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};
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static const struct xfrm_algo_list xfrm_aalg_list = {
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.algs = aalg_list,
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.entries = ARRAY_SIZE(aalg_list),
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.type = CRYPTO_ALG_TYPE_HASH,
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.mask = CRYPTO_ALG_TYPE_HASH_MASK,
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};
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static const struct xfrm_algo_list xfrm_ealg_list = {
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.algs = ealg_list,
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.entries = ARRAY_SIZE(ealg_list),
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.type = CRYPTO_ALG_TYPE_BLKCIPHER,
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.mask = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
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};
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static const struct xfrm_algo_list xfrm_calg_list = {
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.algs = calg_list,
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.entries = ARRAY_SIZE(calg_list),
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.type = CRYPTO_ALG_TYPE_COMPRESS,
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.mask = CRYPTO_ALG_TYPE_MASK,
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};
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static struct xfrm_algo_desc *xfrm_find_algo(
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const struct xfrm_algo_list *algo_list,
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int match(const struct xfrm_algo_desc *entry, const void *data),
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const void *data, int probe)
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{
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struct xfrm_algo_desc *list = algo_list->algs;
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int i, status;
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for (i = 0; i < algo_list->entries; i++) {
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if (!match(list + i, data))
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continue;
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if (list[i].available)
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return &list[i];
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if (!probe)
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break;
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status = crypto_has_alg(list[i].name, algo_list->type,
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algo_list->mask);
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if (!status)
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break;
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list[i].available = status;
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return &list[i];
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}
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return NULL;
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}
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static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry,
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const void *data)
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{
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return entry->desc.sadb_alg_id == (unsigned long)data;
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}
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struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id)
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{
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return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_id_match,
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(void *)(unsigned long)alg_id, 1);
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}
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EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid);
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struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id)
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{
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return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_id_match,
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(void *)(unsigned long)alg_id, 1);
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}
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EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid);
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struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id)
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{
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return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_id_match,
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(void *)(unsigned long)alg_id, 1);
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}
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EXPORT_SYMBOL_GPL(xfrm_calg_get_byid);
|
|
|
|
static int xfrm_alg_name_match(const struct xfrm_algo_desc *entry,
|
|
const void *data)
|
|
{
|
|
const char *name = data;
|
|
|
|
return name && (!strcmp(name, entry->name) ||
|
|
(entry->compat && !strcmp(name, entry->compat)));
|
|
}
|
|
|
|
struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe)
|
|
{
|
|
return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_name_match, name,
|
|
probe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname);
|
|
|
|
struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe)
|
|
{
|
|
return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_name_match, name,
|
|
probe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname);
|
|
|
|
struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe)
|
|
{
|
|
return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_name_match, name,
|
|
probe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_calg_get_byname);
|
|
|
|
struct xfrm_aead_name {
|
|
const char *name;
|
|
int icvbits;
|
|
};
|
|
|
|
static int xfrm_aead_name_match(const struct xfrm_algo_desc *entry,
|
|
const void *data)
|
|
{
|
|
const struct xfrm_aead_name *aead = data;
|
|
const char *name = aead->name;
|
|
|
|
return aead->icvbits == entry->uinfo.aead.icv_truncbits && name &&
|
|
!strcmp(name, entry->name);
|
|
}
|
|
|
|
struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len, int probe)
|
|
{
|
|
struct xfrm_aead_name data = {
|
|
.name = name,
|
|
.icvbits = icv_len,
|
|
};
|
|
|
|
return xfrm_find_algo(&xfrm_aead_list, xfrm_aead_name_match, &data,
|
|
probe);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_aead_get_byname);
|
|
|
|
struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx)
|
|
{
|
|
if (idx >= aalg_entries())
|
|
return NULL;
|
|
|
|
return &aalg_list[idx];
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_aalg_get_byidx);
|
|
|
|
struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx)
|
|
{
|
|
if (idx >= ealg_entries())
|
|
return NULL;
|
|
|
|
return &ealg_list[idx];
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_ealg_get_byidx);
|
|
|
|
/*
|
|
* Probe for the availability of crypto algorithms, and set the available
|
|
* flag for any algorithms found on the system. This is typically called by
|
|
* pfkey during userspace SA add, update or register.
|
|
*/
|
|
void xfrm_probe_algs(void)
|
|
{
|
|
int i, status;
|
|
|
|
BUG_ON(in_softirq());
|
|
|
|
for (i = 0; i < aalg_entries(); i++) {
|
|
status = crypto_has_hash(aalg_list[i].name, 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
if (aalg_list[i].available != status)
|
|
aalg_list[i].available = status;
|
|
}
|
|
|
|
for (i = 0; i < ealg_entries(); i++) {
|
|
status = crypto_has_blkcipher(ealg_list[i].name, 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
if (ealg_list[i].available != status)
|
|
ealg_list[i].available = status;
|
|
}
|
|
|
|
for (i = 0; i < calg_entries(); i++) {
|
|
status = crypto_has_comp(calg_list[i].name, 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
if (calg_list[i].available != status)
|
|
calg_list[i].available = status;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_probe_algs);
|
|
|
|
int xfrm_count_auth_supported(void)
|
|
{
|
|
int i, n;
|
|
|
|
for (i = 0, n = 0; i < aalg_entries(); i++)
|
|
if (aalg_list[i].available)
|
|
n++;
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_count_auth_supported);
|
|
|
|
int xfrm_count_enc_supported(void)
|
|
{
|
|
int i, n;
|
|
|
|
for (i = 0, n = 0; i < ealg_entries(); i++)
|
|
if (ealg_list[i].available)
|
|
n++;
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
|
|
|
|
/* Move to common area: it is shared with AH. */
|
|
|
|
int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
|
|
int offset, int len, icv_update_fn_t icv_update)
|
|
{
|
|
int start = skb_headlen(skb);
|
|
int i, copy = start - offset;
|
|
struct sk_buff *frag_iter;
|
|
struct scatterlist sg;
|
|
int err;
|
|
|
|
/* Checksum header. */
|
|
if (copy > 0) {
|
|
if (copy > len)
|
|
copy = len;
|
|
|
|
sg_init_one(&sg, skb->data + offset, copy);
|
|
|
|
err = icv_update(desc, &sg, copy);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if ((len -= copy) == 0)
|
|
return 0;
|
|
offset += copy;
|
|
}
|
|
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
|
int end;
|
|
|
|
WARN_ON(start > offset + len);
|
|
|
|
end = start + skb_shinfo(skb)->frags[i].size;
|
|
if ((copy = end - offset) > 0) {
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
|
|
|
if (copy > len)
|
|
copy = len;
|
|
|
|
sg_init_table(&sg, 1);
|
|
sg_set_page(&sg, frag->page, copy,
|
|
frag->page_offset + offset-start);
|
|
|
|
err = icv_update(desc, &sg, copy);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if (!(len -= copy))
|
|
return 0;
|
|
offset += copy;
|
|
}
|
|
start = end;
|
|
}
|
|
|
|
skb_walk_frags(skb, frag_iter) {
|
|
int end;
|
|
|
|
WARN_ON(start > offset + len);
|
|
|
|
end = start + frag_iter->len;
|
|
if ((copy = end - offset) > 0) {
|
|
if (copy > len)
|
|
copy = len;
|
|
err = skb_icv_walk(frag_iter, desc, offset-start,
|
|
copy, icv_update);
|
|
if (unlikely(err))
|
|
return err;
|
|
if ((len -= copy) == 0)
|
|
return 0;
|
|
offset += copy;
|
|
}
|
|
start = end;
|
|
}
|
|
BUG_ON(len);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skb_icv_walk);
|
|
|
|
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
|
|
|
|
void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len)
|
|
{
|
|
if (tail != skb) {
|
|
skb->data_len += len;
|
|
skb->len += len;
|
|
}
|
|
return skb_put(tail, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pskb_put);
|
|
#endif
|