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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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