/* SPDX-License-Identifier: GPL-2.0-or-later *//* SCTP kernel implementation * (C) Copyright 2007 Hewlett-Packard Development Company, L.P. * * This file is part of the SCTP kernel implementation * * Please send any bug reports or fixes you make to the * email address(es): *    lksctp developers <linux-sctp@vger.kernel.org> * * Written or modified by: *   Vlad Yasevich     <vladislav.yasevich@hp.com> */ #ifndef __sctp_auth_h__#define __sctp_auth_h__ #include <linux/list.h>#include <linux/refcount.h> struct sctp_endpoint;struct sctp_association;struct sctp_authkey;struct sctp_hmacalgo;struct sctp_cookie; /* Defines an HMAC algorithm supported by SCTP chunk authentication */struct sctp_hmac {	__u16 hmac_id;		/* one of SCTP_AUTH_HMAC_ID_* */	__u16 hmac_len;		/* length of the HMAC value in bytes */}; /* This is generic structure that containst authentication bytes used * as keying material.  It's a what is referred to as byte-vector all * over SCTP-AUTH */struct sctp_auth_bytes {	refcount_t refcnt;	__u32 len;	__u8  data[];}; /* Definition for a shared key, weather endpoint or association */struct sctp_shared_key {	struct list_head key_list;	struct sctp_auth_bytes *key;	refcount_t refcnt;	__u16 key_id;	__u8 deactivated;}; #define key_for_each(__key, __list_head) \	list_for_each_entry(__key, __list_head, key_list) #define key_for_each_safe(__key, __tmp, __list_head) \	list_for_each_entry_safe(__key, __tmp, __list_head, key_list) static inline void sctp_auth_key_hold(struct sctp_auth_bytes *key){	if (!key)		return; 	refcount_inc(&key->refcnt);} void sctp_auth_key_put(struct sctp_auth_bytes *key);struct sctp_shared_key *sctp_auth_shkey_create(__u16 key_id, gfp_t gfp);void sctp_auth_destroy_keys(struct list_head *keys);int sctp_auth_asoc_init_active_key(struct sctp_association *asoc, gfp_t gfp);struct sctp_shared_key *sctp_auth_get_shkey(				const struct sctp_association *asoc,				__u16 key_id);int sctp_auth_asoc_copy_shkeys(const struct sctp_endpoint *ep,				struct sctp_association *asoc,				gfp_t gfp);bool sctp_auth_verify_cookie_params(const struct sctp_endpoint *ep,				    const struct sctp_cookie *cookie);const struct sctp_hmac *sctp_auth_get_hmac(__u16 hmac_id);const struct sctp_hmac *sctp_auth_asoc_get_hmac(const struct sctp_association *asoc);void sctp_auth_asoc_set_default_hmac(struct sctp_association *asoc,				     struct sctp_hmac_algo_param *hmacs);int sctp_auth_asoc_verify_hmac_id(const struct sctp_association *asoc,				    __be16 hmac_id);int sctp_auth_send_cid(enum sctp_cid chunk,		       const struct sctp_association *asoc);int sctp_auth_recv_cid(enum sctp_cid chunk,		       const struct sctp_association *asoc);int sctp_auth_calculate_hmac(const struct sctp_association *asoc,			     struct sk_buff *skb, struct sctp_auth_chunk *auth,			     struct sctp_shared_key *ep_key, gfp_t gfp);void sctp_auth_shkey_release(struct sctp_shared_key *sh_key);void sctp_auth_shkey_hold(struct sctp_shared_key *sh_key); /* API Helpers */int sctp_auth_ep_add_chunkid(struct sctp_endpoint *ep, __u8 chunk_id);int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,			    struct sctp_hmacalgo *hmacs);int sctp_auth_set_key(struct sctp_endpoint *ep, struct sctp_association *asoc,		      struct sctp_authkey *auth_key);int sctp_auth_set_active_key(struct sctp_endpoint *ep,			     struct sctp_association *asoc, __u16 key_id);int sctp_auth_del_key_id(struct sctp_endpoint *ep,			 struct sctp_association *asoc, __u16 key_id);int sctp_auth_deact_key_id(struct sctp_endpoint *ep,			   struct sctp_association *asoc, __u16 key_id);int sctp_auth_init(struct sctp_endpoint *ep, gfp_t gfp);void sctp_auth_free(struct sctp_endpoint *ep); #endif