[SPARC64]: Add HWCAP_SPARC_BLKINIT elf capability flag for Niagara.
[linux-2.6.git] / include / net / esp.h
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