cleanup asm/scatterlist.h includes
[linux-2.6.git] / include / net / esp.h
1 #ifndef _NET_ESP_H
2 #define _NET_ESP_H
3
4 #include <linux/crypto.h>
5 #include <net/xfrm.h>
6 #include <linux/scatterlist.h>
7
8 #define ESP_NUM_FAST_SG         4
9
10 struct esp_data
11 {
12         struct scatterlist              sgbuf[ESP_NUM_FAST_SG];
13
14         /* Confidentiality */
15         struct {
16                 int                     padlen;         /* 0..255 */
17                 /* ivlen is offset from enc_data, where encrypted data start.
18                  * It is logically different of crypto_tfm_alg_ivsize(tfm).
19                  * We assume that it is either zero (no ivec), or
20                  * >= crypto_tfm_alg_ivsize(tfm). */
21                 int                     ivlen;
22                 int                     ivinitted;
23                 u8                      *ivec;          /* ivec buffer */
24                 struct crypto_blkcipher *tfm;           /* crypto handle */
25         } conf;
26
27         /* Integrity. It is active when icv_full_len != 0 */
28         struct {
29                 u8                      *work_icv;
30                 int                     icv_full_len;
31                 int                     icv_trunc_len;
32                 struct crypto_hash      *tfm;
33         } auth;
34 };
35
36 extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
37
38 static inline int esp_mac_digest(struct esp_data *esp, struct sk_buff *skb,
39                                  int offset, int len)
40 {
41         struct hash_desc desc;
42         int err;
43
44         desc.tfm = esp->auth.tfm;
45         desc.flags = 0;
46
47         err = crypto_hash_init(&desc);
48         if (unlikely(err))
49                 return err;
50         err = skb_icv_walk(skb, &desc, offset, len, crypto_hash_update);
51         if (unlikely(err))
52                 return err;
53         return crypto_hash_final(&desc, esp->auth.work_icv);
54 }
55
56 struct ip_esp_hdr;
57
58 static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)
59 {
60         return (struct ip_esp_hdr *)skb_transport_header(skb);
61 }
62
63 #endif