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net/xfrm/xfrm_algo.c
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/* |
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* 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 |
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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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#include <linux/module.h> #include <linux/kernel.h> #include <linux/pfkeyv2.h> #include <linux/crypto.h> |
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#include <linux/scatterlist.h> |
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#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 |
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/* * 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. */ |
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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 } }, |
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{ .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 } }, |
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}; |
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static struct xfrm_algo_desc aalg_list[] = { { |
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.name = "digest_null", |
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|
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.uinfo = { .auth = { .icv_truncbits = 0, .icv_fullbits = 0, } }, |
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|
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.desc = { .sadb_alg_id = SADB_X_AALG_NULL, .sadb_alg_ivlen = 0, .sadb_alg_minbits = 0, .sadb_alg_maxbits = 0 } }, { |
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.name = "hmac(md5)", .compat = "md5", |
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.uinfo = { .auth = { .icv_truncbits = 96, .icv_fullbits = 128, } }, |
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.desc = { .sadb_alg_id = SADB_AALG_MD5HMAC, .sadb_alg_ivlen = 0, .sadb_alg_minbits = 128, .sadb_alg_maxbits = 128 } }, { |
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.name = "hmac(sha1)", .compat = "sha1", |
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.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 } }, { |
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.name = "hmac(sha256)", .compat = "sha256", |
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.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 } }, { |
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.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 } }, { |
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.name = "hmac(rmd160)", .compat = "rmd160", |
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.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 } }, |
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{ .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 } }, |
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}; static struct xfrm_algo_desc ealg_list[] = { { |
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.name = "ecb(cipher_null)", .compat = "cipher_null", |
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.uinfo = { .encr = { .blockbits = 8, .defkeybits = 0, } }, |
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.desc = { .sadb_alg_id = SADB_EALG_NULL, .sadb_alg_ivlen = 0, .sadb_alg_minbits = 0, .sadb_alg_maxbits = 0 } }, { |
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.name = "cbc(des)", .compat = "des", |
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.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 } }, { |
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.name = "cbc(des3_ede)", .compat = "des3_ede", |
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.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 } }, { |
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.name = "cbc(cast5)", .compat = "cast5", |
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.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 } }, { |
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.name = "cbc(blowfish)", .compat = "blowfish", |
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.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 } }, { |
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.name = "cbc(aes)", .compat = "aes", |
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.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 } }, { |
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.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, } |
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}, { |
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.name = "cbc(camellia)", |
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.compat = "camellia", |
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.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 } }, { |
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.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 } |
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}, |
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{ .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, |
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.sadb_alg_minbits = 160, .sadb_alg_maxbits = 288 |
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} }, |
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}; 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 } }, }; |
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static inline int aead_entries(void) { return ARRAY_SIZE(aead_list); } |
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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); } |
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struct xfrm_algo_list { struct xfrm_algo_desc *algs; int entries; u32 type; u32 mask; }; |
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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, }; |
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static const struct xfrm_algo_list xfrm_aalg_list = { .algs = aalg_list, .entries = ARRAY_SIZE(aalg_list), .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 = { .algs = ealg_list, .entries = ARRAY_SIZE(ealg_list), .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 = { .algs = calg_list, .entries = ARRAY_SIZE(calg_list), .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( const struct xfrm_algo_list *algo_list, int match(const struct xfrm_algo_desc *entry, const void *data), 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++) { if (!match(list + i, data)) |
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continue; if (list[i].available) return &list[i]; if (!probe) break; |
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status = crypto_has_alg(list[i].name, algo_list->type, algo_list->mask); |
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if (!status) break; list[i].available = status; return &list[i]; } return NULL; } |
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static int xfrm_alg_id_match(const struct xfrm_algo_desc *entry, const void *data) { |
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return entry->desc.sadb_alg_id == (unsigned long)data; |
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} struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id) { 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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} 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, |
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(void *)(unsigned long)alg_id, 1); |
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} 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, |
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(void *)(unsigned long)alg_id, 1); |
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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))); } |
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struct xfrm_algo_desc *xfrm_aalg_get_byname(const char *name, int probe) |
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{ |
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return xfrm_find_algo(&xfrm_aalg_list, xfrm_alg_name_match, name, probe); |
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} EXPORT_SYMBOL_GPL(xfrm_aalg_get_byname); |
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struct xfrm_algo_desc *xfrm_ealg_get_byname(const char *name, int probe) |
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{ |
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return xfrm_find_algo(&xfrm_ealg_list, xfrm_alg_name_match, name, probe); |
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} EXPORT_SYMBOL_GPL(xfrm_ealg_get_byname); |
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struct xfrm_algo_desc *xfrm_calg_get_byname(const char *name, int probe) |
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{ |
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return xfrm_find_algo(&xfrm_calg_list, xfrm_alg_name_match, name, probe); |
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} EXPORT_SYMBOL_GPL(xfrm_calg_get_byname); |
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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); } |
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struct xfrm_algo_desc *xfrm_aead_get_byname(const char *name, int icv_len, int probe) |
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{ 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); |
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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) { |
1da177e4c Linux-2.6.12-rc2 |
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int i, status; |
a716c1197 [NET] XFRM: Fix w... |
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1da177e4c Linux-2.6.12-rc2 |
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BUG_ON(in_softirq()); for (i = 0; i < aalg_entries(); i++) { |
e4d5b79c6 [CRYPTO] users: U... |
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status = crypto_has_hash(aalg_list[i].name, 0, CRYPTO_ALG_ASYNC); |
1da177e4c Linux-2.6.12-rc2 |
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if (aalg_list[i].available != status) aalg_list[i].available = status; } |
a716c1197 [NET] XFRM: Fix w... |
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1da177e4c Linux-2.6.12-rc2 |
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for (i = 0; i < ealg_entries(); i++) { |
e4d5b79c6 [CRYPTO] users: U... |
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status = crypto_has_blkcipher(ealg_list[i].name, 0, CRYPTO_ALG_ASYNC); |
1da177e4c Linux-2.6.12-rc2 |
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if (ealg_list[i].available != status) ealg_list[i].available = status; } |
a716c1197 [NET] XFRM: Fix w... |
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1da177e4c Linux-2.6.12-rc2 |
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for (i = 0; i < calg_entries(); i++) { |
e4d5b79c6 [CRYPTO] users: U... |
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status = crypto_has_comp(calg_list[i].name, 0, CRYPTO_ALG_ASYNC); |
1da177e4c Linux-2.6.12-rc2 |
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if (calg_list[i].available != status) calg_list[i].available = status; } |
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} 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); |
1da177e4c Linux-2.6.12-rc2 |
727 |
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE) |
1da177e4c Linux-2.6.12-rc2 |
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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 |