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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/net/esp.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/net/esp.h')
-rw-r--r--include/net/esp.h59
1 files changed, 59 insertions, 0 deletions
diff --git a/include/net/esp.h b/include/net/esp.h
new file mode 100644
index 00000000000..90cd94fad7d
--- /dev/null
+++ b/include/net/esp.h
@@ -0,0 +1,59 @@
+#ifndef _NET_ESP_H
+#define _NET_ESP_H
+
+#include <net/xfrm.h>
+#include <asm/scatterlist.h>
+
+#define ESP_NUM_FAST_SG 4
+
+struct esp_data
+{
+ struct scatterlist sgbuf[ESP_NUM_FAST_SG];
+
+ /* Confidentiality */
+ struct {
+ u8 *key; /* Key */
+ int key_len; /* Key length */
+ u8 *ivec; /* ivec buffer */
+ /* ivlen is offset from enc_data, where encrypted data start.
+ * It is logically different of crypto_tfm_alg_ivsize(tfm).
+ * We assume that it is either zero (no ivec), or
+ * >= crypto_tfm_alg_ivsize(tfm). */
+ int ivlen;
+ int padlen; /* 0..255 */
+ struct crypto_tfm *tfm; /* crypto handle */
+ } conf;
+
+ /* Integrity. It is active when icv_full_len != 0 */
+ struct {
+ u8 *key; /* Key */
+ int key_len; /* Length of the key */
+ u8 *work_icv;
+ int icv_full_len;
+ int icv_trunc_len;
+ void (*icv)(struct esp_data*,
+ struct sk_buff *skb,
+ int offset, int len, u8 *icv);
+ struct crypto_tfm *tfm;
+ } auth;
+};
+
+extern int skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len);
+extern int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer);
+extern void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
+
+static inline void
+esp_hmac_digest(struct esp_data *esp, struct sk_buff *skb, int offset,
+ int len, u8 *auth_data)
+{
+ struct crypto_tfm *tfm = esp->auth.tfm;
+ char *icv = esp->auth.work_icv;
+
+ memset(auth_data, 0, esp->auth.icv_trunc_len);
+ crypto_hmac_init(tfm, esp->auth.key, &esp->auth.key_len);
+ skb_icv_walk(skb, tfm, offset, len, crypto_hmac_update);
+ crypto_hmac_final(tfm, esp->auth.key, &esp->auth.key_len, icv);
+ memcpy(auth_data, icv, esp->auth.icv_trunc_len);
+}
+
+#endif