88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Generic netlink handshake service
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*
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* Author: Chuck Lever <chuck.lever@oracle.com>
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*
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* Copyright (c) 2023, Oracle and/or its affiliates.
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*/
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#ifndef _INTERNAL_HANDSHAKE_H
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#define _INTERNAL_HANDSHAKE_H
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/* Per-net namespace context */
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struct handshake_net {
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spinlock_t hn_lock; /* protects next 3 fields */
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int hn_pending;
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int hn_pending_max;
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struct list_head hn_requests;
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unsigned long hn_flags;
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};
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enum hn_flags_bits {
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HANDSHAKE_F_NET_DRAINING,
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};
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struct handshake_proto;
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/* One handshake request */
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struct handshake_req {
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struct list_head hr_list;
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struct rhash_head hr_rhash;
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unsigned long hr_flags;
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const struct handshake_proto *hr_proto;
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struct sock *hr_sk;
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void (*hr_odestruct)(struct sock *sk);
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/* Always the last field */
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char hr_priv[];
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};
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enum hr_flags_bits {
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HANDSHAKE_F_REQ_COMPLETED,
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};
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/* Invariants for all handshake requests for one transport layer
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* security protocol
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*/
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struct handshake_proto {
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int hp_handler_class;
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size_t hp_privsize;
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unsigned long hp_flags;
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int (*hp_accept)(struct handshake_req *req,
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struct genl_info *info, int fd);
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void (*hp_done)(struct handshake_req *req,
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unsigned int status,
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struct genl_info *info);
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void (*hp_destroy)(struct handshake_req *req);
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};
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enum hp_flags_bits {
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HANDSHAKE_F_PROTO_NOTIFY,
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};
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/* netlink.c */
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int handshake_genl_notify(struct net *net, const struct handshake_proto *proto,
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gfp_t flags);
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struct nlmsghdr *handshake_genl_put(struct sk_buff *msg,
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struct genl_info *info);
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struct handshake_net *handshake_pernet(struct net *net);
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/* request.c */
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struct handshake_req *handshake_req_alloc(const struct handshake_proto *proto,
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gfp_t flags);
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int handshake_req_hash_init(void);
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void handshake_req_hash_destroy(void);
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void *handshake_req_private(struct handshake_req *req);
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struct handshake_req *handshake_req_hash_lookup(struct sock *sk);
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struct handshake_req *handshake_req_next(struct handshake_net *hn, int class);
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int handshake_req_submit(struct socket *sock, struct handshake_req *req,
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gfp_t flags);
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void handshake_complete(struct handshake_req *req, unsigned int status,
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struct genl_info *info);
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bool handshake_req_cancel(struct sock *sk);
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#endif /* _INTERNAL_HANDSHAKE_H */
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