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