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