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/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _NET_ESP_H

#define _NET_ESP_H

#include <linux/skbuff.h>

struct ip_esp_hdr;

struct xfrm_state;

static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)

{

return (struct ip_esp_hdr *)skb_transport_header(skb);

}

static inline void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)

{

/* Fill padding... */

if (tfclen) {

memset(tail, 0, tfclen);

tail += tfclen;

}

do {

int i;

for (i = 0; i < plen - 2; i++)

tail[i] = i + 1;

} while (0);

tail[plen - 2] = plen - 2;

tail[plen - 1] = proto;

}

struct esp_info {

struct ip_esp_hdr *esph;

__be64 seqno;

int tfclen;

int tailen;

int plen;

int clen;

int len;

int nfrags;

__u8 proto;

bool inplace;

};

int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);

int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);

int esp_input_done2(struct sk_buff *skb, int err);

int esp6_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);

int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp);

int esp6_input_done2(struct sk_buff *skb, int err);

#endif

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