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1da177e4 LT |
1 | #ifndef _NET_ESP_H |
2 | #define _NET_ESP_H | |
3 | ||
4 | #include <net/xfrm.h> | |
5 | #include <asm/scatterlist.h> | |
6 | ||
7 | #define ESP_NUM_FAST_SG 4 | |
8 | ||
9 | struct esp_data | |
10 | { | |
11 | struct scatterlist sgbuf[ESP_NUM_FAST_SG]; | |
12 | ||
13 | /* Confidentiality */ | |
14 | struct { | |
15 | u8 *key; /* Key */ | |
16 | int key_len; /* Key length */ | |
17 | u8 *ivec; /* ivec buffer */ | |
18 | /* ivlen is offset from enc_data, where encrypted data start. | |
19 | * It is logically different of crypto_tfm_alg_ivsize(tfm). | |
20 | * We assume that it is either zero (no ivec), or | |
21 | * >= crypto_tfm_alg_ivsize(tfm). */ | |
22 | int ivlen; | |
23 | int padlen; /* 0..255 */ | |
24 | struct crypto_tfm *tfm; /* crypto handle */ | |
25 | } conf; | |
26 | ||
27 | /* Integrity. It is active when icv_full_len != 0 */ | |
28 | struct { | |
29 | u8 *key; /* Key */ | |
30 | int key_len; /* Length of the key */ | |
31 | u8 *work_icv; | |
32 | int icv_full_len; | |
33 | int icv_trunc_len; | |
34 | void (*icv)(struct esp_data*, | |
35 | struct sk_buff *skb, | |
36 | int offset, int len, u8 *icv); | |
37 | struct crypto_tfm *tfm; | |
38 | } auth; | |
39 | }; | |
40 | ||
41 | extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len); | |
42 | extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer); | |
43 | extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len); | |
44 | ||
45 | static inline void | |
46 | esp_hmac_digest(struct esp_data *esp, struct sk_buff *skb, int offset, | |
47 | int len, u8 *auth_data) | |
48 | { | |
49 | struct crypto_tfm *tfm = esp->auth.tfm; | |
50 | char *icv = esp->auth.work_icv; | |
51 | ||
52 | memset(auth_data, 0, esp->auth.icv_trunc_len); | |
53 | crypto_hmac_init(tfm, esp->auth.key, &esp->auth.key_len); | |
54 | skb_icv_walk(skb, tfm, offset, len, crypto_hmac_update); | |
55 | crypto_hmac_final(tfm, esp->auth.key, &esp->auth.key_len, icv); | |
56 | memcpy(auth_data, icv, esp->auth.icv_trunc_len); | |
57 | } | |
58 | ||
59 | #endif |