/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <david.lebrun@uclouvain.be>
 */

#ifndef _NET_SEG6_HMAC_H
#define _NET_SEG6_HMAC_H

#include <crypto/sha1.h>
#include <crypto/sha2.h>
#include <net/flow.h>
#include <net/ip6_fib.h>
#include <net/sock.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/route.h>
#include <net/seg6.h>
#include <linux/seg6_hmac.h>
#include <linux/rhashtable-types.h>

#define SEG6_HMAC_RING_SIZE             256

struct seg6_hmac_info {
        struct rhash_head node;
        struct rcu_head rcu;

        u32 hmackeyid;
        /* The raw key, kept only so it can be returned back to userspace */
        char secret[SEG6_HMAC_SECRET_LEN];
        u8 slen;
        u8 alg_id;
        /* The prepared key, which the calculations actually use */
        union {
                struct hmac_sha1_key sha1;
                struct hmac_sha256_key sha256;
        } key;
};

extern int seg6_hmac_compute(struct seg6_hmac_info *hinfo,
                             struct ipv6_sr_hdr *hdr, struct in6_addr *saddr,
                             u8 *output);
extern struct seg6_hmac_info *seg6_hmac_info_lookup(struct net *net, u32 key);
extern int seg6_hmac_info_add(struct net *net, u32 key,
                              struct seg6_hmac_info *hinfo);
extern int seg6_hmac_info_del(struct net *net, u32 key);
extern int seg6_push_hmac(struct net *net, struct in6_addr *saddr,
                          struct ipv6_sr_hdr *srh);
extern bool seg6_hmac_validate_skb(struct sk_buff *skb);
#ifdef CONFIG_IPV6_SEG6_HMAC
extern int seg6_hmac_net_init(struct net *net);
extern void seg6_hmac_net_exit(struct net *net);
#else
static inline int seg6_hmac_net_init(struct net *net) { return 0; }
static inline void seg6_hmac_net_exit(struct net *net) {}
#endif

#endif