diff options
Diffstat (limited to 'net/xfrm/xfrm_algo.c')
| -rw-r--r-- | net/xfrm/xfrm_algo.c | 754 |
1 files changed, 754 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c new file mode 100644 index 00000000..791ab2e7 --- /dev/null +++ b/net/xfrm/xfrm_algo.c @@ -0,0 +1,754 @@ +/* + * xfrm algorithm interface + * + * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/pfkeyv2.h> +#include <linux/crypto.h> +#include <linux/scatterlist.h> +#include <net/xfrm.h> +#if defined(CONFIG_INET_AH) || defined(CONFIG_INET_AH_MODULE) || defined(CONFIG_INET6_AH) || defined(CONFIG_INET6_AH_MODULE) +#include <net/ah.h> +#endif +#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE) +#include <net/esp.h> +#endif + +/* + * Algorithms supported by IPsec. These entries contain properties which + * are used in key negotiation and xfrm processing, and are used to verify + * that instantiated crypto transforms have correct parameters for IPsec + * purposes. + */ +static struct xfrm_algo_desc aead_list[] = { +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 64, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV8, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 96, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV12, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4106(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_GCM_ICV16, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 64, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV8, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 96, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV12, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4309(ccm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AES_CCM_ICV16, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc4543(gcm(aes))", + + .uinfo = { + .aead = { + .icv_truncbits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_NULL_AES_GMAC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +}; + +static struct xfrm_algo_desc aalg_list[] = { +{ + .name = "digest_null", + + .uinfo = { + .auth = { + .icv_truncbits = 0, + .icv_fullbits = 0, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_AALG_NULL, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 0, + .sadb_alg_maxbits = 0 + } +}, +{ + .name = "hmac(md5)", + .compat = "md5", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_AALG_MD5HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 128 + } +}, +{ + .name = "hmac(sha1)", + .compat = "sha1", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 160, + } + }, + + .desc = { + .sadb_alg_id = SADB_AALG_SHA1HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 160 + } +}, +{ + .name = "hmac(sha256)", + .compat = "sha256", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 256, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_256HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 256, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "hmac(sha384)", + + .uinfo = { + .auth = { + .icv_truncbits = 192, + .icv_fullbits = 384, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_384HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 384, + .sadb_alg_maxbits = 384 + } +}, +{ + .name = "hmac(sha512)", + + .uinfo = { + .auth = { + .icv_truncbits = 256, + .icv_fullbits = 512, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_AALG_SHA2_512HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 512, + .sadb_alg_maxbits = 512 + } +}, +{ + .name = "hmac(rmd160)", + .compat = "rmd160", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 160, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_AALG_RIPEMD160HMAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 160 + } +}, +{ + .name = "xcbc(aes)", + + .uinfo = { + .auth = { + .icv_truncbits = 96, + .icv_fullbits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_AALG_AES_XCBC_MAC, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 128 + } +}, +}; + +static struct xfrm_algo_desc ealg_list[] = { +{ + .name = "ecb(cipher_null)", + .compat = "cipher_null", + + .uinfo = { + .encr = { + .blockbits = 8, + .defkeybits = 0, + } + }, + + .desc = { + .sadb_alg_id = SADB_EALG_NULL, + .sadb_alg_ivlen = 0, + .sadb_alg_minbits = 0, + .sadb_alg_maxbits = 0 + } +}, +{ + .name = "cbc(des)", + .compat = "des", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 64, + } + }, + + .desc = { + .sadb_alg_id = SADB_EALG_DESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 64, + .sadb_alg_maxbits = 64 + } +}, +{ + .name = "cbc(des3_ede)", + .compat = "des3_ede", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 192, + } + }, + + .desc = { + .sadb_alg_id = SADB_EALG_3DESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 192, + .sadb_alg_maxbits = 192 + } +}, +{ + .name = "cbc(cast5)", + .compat = "cast5", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_CASTCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 40, + .sadb_alg_maxbits = 128 + } +}, +{ + .name = "cbc(blowfish)", + .compat = "blowfish", + + .uinfo = { + .encr = { + .blockbits = 64, + .defkeybits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_BLOWFISHCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 40, + .sadb_alg_maxbits = 448 + } +}, +{ + .name = "cbc(aes)", + .compat = "aes", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AESCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "cbc(serpent)", + .compat = "serpent", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_SERPENTCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256, + } +}, +{ + .name = "cbc(camellia)", + .compat = "camellia", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_CAMELLIACBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "cbc(twofish)", + .compat = "twofish", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 128, + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_TWOFISHCBC, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 128, + .sadb_alg_maxbits = 256 + } +}, +{ + .name = "rfc3686(ctr(aes))", + + .uinfo = { + .encr = { + .blockbits = 128, + .defkeybits = 160, /* 128-bit key + 32-bit nonce */ + } + }, + + .desc = { + .sadb_alg_id = SADB_X_EALG_AESCTR, + .sadb_alg_ivlen = 8, + .sadb_alg_minbits = 160, + .sadb_alg_maxbits = 288 + } +}, +}; + +static struct xfrm_algo_desc calg_list[] = { +{ + .name = "deflate", + .uinfo = { + .comp = { + .threshold = 90, + } + }, + .desc = { .sadb_alg_id = SADB_X_CALG_DEFLATE } +}, +{ + .name = "lzs", + .uinfo = { + .comp = { + .threshold = 90, + } + }, + .desc = { .sadb_alg_id = SADB_X_CALG_LZS } +}, +{ + .name = "lzjh", + .uinfo = { + .comp = { + .threshold = 50, + } + }, + .desc = { .sadb_alg_id = SADB_X_CALG_LZJH } +}, +}; + +static inline int aead_entries(void) +{ + return ARRAY_SIZE(aead_list); +} + +static inline int aalg_entries(void) +{ + return ARRAY_SIZE(aalg_list); +} + +static inline int ealg_entries(void) +{ + return ARRAY_SIZE(ealg_list); +} + +static inline int calg_entries(void) +{ + return ARRAY_SIZE(calg_list); +} + +struct xfrm_algo_list { + struct xfrm_algo_desc *algs; + int entries; + u32 type; + u32 mask; +}; + +static const struct xfrm_algo_list xfrm_aead_list = { + .algs = aead_list, + .entries = ARRAY_SIZE(aead_list), + .type = CRYPTO_ALG_TYPE_AEAD, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static const struct xfrm_algo_list xfrm_aalg_list = { + .algs = aalg_list, + .entries = ARRAY_SIZE(aalg_list), + .type = CRYPTO_ALG_TYPE_HASH, + .mask = CRYPTO_ALG_TYPE_HASH_MASK, +}; + +static const struct xfrm_algo_list xfrm_ealg_list = { + .algs = ealg_list, + .entries = ARRAY_SIZE(ealg_list), + .type = CRYPTO_ALG_TYPE_BLKCIPHER, + .mask = CRYPTO_ALG_TYPE_BLKCIPHER_MASK, +}; + +static const struct xfrm_algo_list xfrm_calg_list = { + .algs = calg_list, + .entries = ARRAY_SIZE(calg_list), + .type = CRYPTO_ALG_TYPE_COMPRESS, + .mask = CRYPTO_ALG_TYPE_MASK, +}; + +static struct xfrm_algo_desc *xfrm_find_algo( + const struct xfrm_algo_list *algo_list, + int match(const struct xfrm_algo_desc *entry, const void *data), + const void *data, int probe) +{ + struct xfrm_algo_desc *list = algo_list->algs; + int i, status; + + for (i = 0; i < algo_list->entries; i++) { + if (!match(list + i, data)) + continue; + + if (list[i].available) + return &list[i]; + + if (!probe) + break; + + status = crypto_has_alg(list[i].name, algo_list->type, + algo_list->mask); + if (!status) + break; + + list[i].available = status; + return &list[i]; + } + return NULL; +} + +static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry, + const void *data) +{ + return entry->desc.sadb_alg_id == (unsigned long)data; +} + +struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_aalg_get_byid); + +struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +EXPORT_SYMBOL_GPL(xfrm_ealg_get_byid); + +struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id) +{ + return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_id_match, + (void *)(unsigned long)alg_id, 1); +} +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(const 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(const 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(const 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(const 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); + +#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 |