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8#ifndef _CRYPTO_IF_ALG_H
9#define _CRYPTO_IF_ALG_H
10
11#include <linux/compiler.h>
12#include <linux/completion.h>
13#include <linux/if_alg.h>
14#include <linux/scatterlist.h>
15#include <linux/types.h>
16#include <linux/atomic.h>
17#include <net/sock.h>
18
19#include <crypto/aead.h>
20#include <crypto/skcipher.h>
21
22#define ALG_MAX_PAGES 16
23
24struct crypto_async_request;
25
26struct alg_sock {
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28 struct sock sk;
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30 struct sock *parent;
31
32 unsigned int refcnt;
33 unsigned int nokey_refcnt;
34
35 const struct af_alg_type *type;
36 void *private;
37};
38
39struct af_alg_control {
40 struct af_alg_iv *iv;
41 int op;
42 unsigned int aead_assoclen;
43};
44
45struct af_alg_type {
46 void *(*bind)(const char *name, u32 type, u32 mask);
47 void (*release)(void *private);
48 int (*setkey)(void *private, const u8 *key, unsigned int keylen);
49 int (*accept)(void *private, struct sock *sk);
50 int (*accept_nokey)(void *private, struct sock *sk);
51 int (*setauthsize)(void *private, unsigned int authsize);
52
53 struct proto_ops *ops;
54 struct proto_ops *ops_nokey;
55 struct module *owner;
56 char name[14];
57};
58
59struct af_alg_sgl {
60 struct scatterlist sg[ALG_MAX_PAGES + 1];
61 struct page *pages[ALG_MAX_PAGES];
62 unsigned int npages;
63};
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65
66struct af_alg_tsgl {
67 struct list_head list;
68 unsigned int cur;
69 struct scatterlist sg[0];
70};
71
72#define MAX_SGL_ENTS ((4096 - sizeof(struct af_alg_tsgl)) / \
73 sizeof(struct scatterlist) - 1)
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76struct af_alg_rsgl {
77 struct af_alg_sgl sgl;
78 struct list_head list;
79 size_t sg_num_bytes;
80};
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95struct af_alg_async_req {
96 struct kiocb *iocb;
97 struct sock *sk;
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99 struct af_alg_rsgl first_rsgl;
100 struct af_alg_rsgl *last_rsgl;
101 struct list_head rsgl_list;
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103 struct scatterlist *tsgl;
104 unsigned int tsgl_entries;
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106 unsigned int outlen;
107 unsigned int areqlen;
108
109 union {
110 struct aead_request aead_req;
111 struct skcipher_request skcipher_req;
112 } cra_u;
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115};
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140struct af_alg_ctx {
141 struct list_head tsgl_list;
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143 void *iv;
144 size_t aead_assoclen;
145
146 struct crypto_wait wait;
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148 size_t used;
149 atomic_t rcvused;
150
151 bool more;
152 bool merge;
153 bool enc;
154
155 unsigned int len;
156};
157
158int af_alg_register_type(const struct af_alg_type *type);
159int af_alg_unregister_type(const struct af_alg_type *type);
160
161int af_alg_release(struct socket *sock);
162void af_alg_release_parent(struct sock *sk);
163int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern);
164
165int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);
166void af_alg_free_sg(struct af_alg_sgl *sgl);
167
168static inline struct alg_sock *alg_sk(struct sock *sk)
169{
170 return (struct alg_sock *)sk;
171}
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179static inline int af_alg_sndbuf(struct sock *sk)
180{
181 struct alg_sock *ask = alg_sk(sk);
182 struct af_alg_ctx *ctx = ask->private;
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184 return max_t(int, max_t(int, sk->sk_sndbuf & PAGE_MASK, PAGE_SIZE) -
185 ctx->used, 0);
186}
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194static inline bool af_alg_writable(struct sock *sk)
195{
196 return PAGE_SIZE <= af_alg_sndbuf(sk);
197}
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205static inline int af_alg_rcvbuf(struct sock *sk)
206{
207 struct alg_sock *ask = alg_sk(sk);
208 struct af_alg_ctx *ctx = ask->private;
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210 return max_t(int, max_t(int, sk->sk_rcvbuf & PAGE_MASK, PAGE_SIZE) -
211 atomic_read(&ctx->rcvused), 0);
212}
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220static inline bool af_alg_readable(struct sock *sk)
221{
222 return PAGE_SIZE <= af_alg_rcvbuf(sk);
223}
224
225unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset);
226void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst,
227 size_t dst_offset);
228void af_alg_wmem_wakeup(struct sock *sk);
229int af_alg_wait_for_data(struct sock *sk, unsigned flags);
230int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
231 unsigned int ivsize);
232ssize_t af_alg_sendpage(struct socket *sock, struct page *page,
233 int offset, size_t size, int flags);
234void af_alg_free_resources(struct af_alg_async_req *areq);
235void af_alg_async_cb(struct crypto_async_request *_req, int err);
236__poll_t af_alg_poll(struct file *file, struct socket *sock,
237 poll_table *wait);
238struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk,
239 unsigned int areqlen);
240int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags,
241 struct af_alg_async_req *areq, size_t maxsize,
242 size_t *outlen);
243
244#endif
245