1 /* 2 * if_alg: User-space algorithm interface 3 * 4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13 #ifndef _CRYPTO_IF_ALG_H 14 #define _CRYPTO_IF_ALG_H 15 16 #include <linux/compiler.h> 17 #include <linux/completion.h> 18 #include <linux/if_alg.h> 19 #include <linux/scatterlist.h> 20 #include <linux/types.h> 21 #include <net/sock.h> 22 23 #define ALG_MAX_PAGES 16 24 25 struct crypto_async_request; 26 27 struct alg_sock { 28 /* struct sock must be the first member of struct alg_sock */ 29 struct sock sk; 30 31 struct sock *parent; 32 33 unsigned int refcnt; 34 unsigned int nokey_refcnt; 35 36 const struct af_alg_type *type; 37 void *private; 38 }; 39 40 struct af_alg_completion { 41 struct completion completion; 42 int err; 43 }; 44 45 struct af_alg_control { 46 struct af_alg_iv *iv; 47 int op; 48 unsigned int aead_assoclen; 49 }; 50 51 struct af_alg_type { 52 void *(*bind)(const char *name, u32 type, u32 mask); 53 void (*release)(void *private); 54 int (*setkey)(void *private, const u8 *key, unsigned int keylen); 55 int (*accept)(void *private, struct sock *sk); 56 int (*accept_nokey)(void *private, struct sock *sk); 57 int (*setauthsize)(void *private, unsigned int authsize); 58 59 struct proto_ops *ops; 60 struct proto_ops *ops_nokey; 61 struct module *owner; 62 char name[14]; 63 }; 64 65 struct af_alg_sgl { 66 struct scatterlist sg[ALG_MAX_PAGES + 1]; 67 struct page *pages[ALG_MAX_PAGES]; 68 unsigned int npages; 69 }; 70 71 int af_alg_register_type(const struct af_alg_type *type); 72 int af_alg_unregister_type(const struct af_alg_type *type); 73 74 int af_alg_release(struct socket *sock); 75 void af_alg_release_parent(struct sock *sk); 76 int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern); 77 78 int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len); 79 void af_alg_free_sg(struct af_alg_sgl *sgl); 80 void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new); 81 82 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con); 83 84 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion); 85 void af_alg_complete(struct crypto_async_request *req, int err); 86 87 static inline struct alg_sock *alg_sk(struct sock *sk) 88 { 89 return (struct alg_sock *)sk; 90 } 91 92 static inline void af_alg_init_completion(struct af_alg_completion *completion) 93 { 94 init_completion(&completion->completion); 95 } 96 97 #endif /* _CRYPTO_IF_ALG_H */ 98