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3b3009ea CL |
1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* | |
3 | * Generic netlink handshake service | |
4 | * | |
5 | * Author: Chuck Lever <chuck.lever@oracle.com> | |
6 | * | |
7 | * Copyright (c) 2023, Oracle and/or its affiliates. | |
8 | */ | |
9 | ||
10 | #ifndef _INTERNAL_HANDSHAKE_H | |
11 | #define _INTERNAL_HANDSHAKE_H | |
12 | ||
13 | /* Per-net namespace context */ | |
14 | struct handshake_net { | |
15 | spinlock_t hn_lock; /* protects next 3 fields */ | |
16 | int hn_pending; | |
17 | int hn_pending_max; | |
18 | struct list_head hn_requests; | |
19 | ||
20 | unsigned long hn_flags; | |
21 | }; | |
22 | ||
23 | enum hn_flags_bits { | |
24 | HANDSHAKE_F_NET_DRAINING, | |
25 | }; | |
26 | ||
27 | struct handshake_proto; | |
28 | ||
29 | /* One handshake request */ | |
30 | struct handshake_req { | |
31 | struct list_head hr_list; | |
32 | struct rhash_head hr_rhash; | |
33 | unsigned long hr_flags; | |
34 | const struct handshake_proto *hr_proto; | |
35 | struct sock *hr_sk; | |
36 | void (*hr_odestruct)(struct sock *sk); | |
37 | ||
38 | /* Always the last field */ | |
39 | char hr_priv[]; | |
40 | }; | |
41 | ||
42 | enum hr_flags_bits { | |
43 | HANDSHAKE_F_REQ_COMPLETED, | |
44 | }; | |
45 | ||
46 | /* Invariants for all handshake requests for one transport layer | |
47 | * security protocol | |
48 | */ | |
49 | struct handshake_proto { | |
50 | int hp_handler_class; | |
51 | size_t hp_privsize; | |
88232ec1 | 52 | unsigned long hp_flags; |
3b3009ea CL |
53 | |
54 | int (*hp_accept)(struct handshake_req *req, | |
55 | struct genl_info *info, int fd); | |
56 | void (*hp_done)(struct handshake_req *req, | |
57 | unsigned int status, | |
58 | struct genl_info *info); | |
59 | void (*hp_destroy)(struct handshake_req *req); | |
60 | }; | |
61 | ||
88232ec1 CL |
62 | enum hp_flags_bits { |
63 | HANDSHAKE_F_PROTO_NOTIFY, | |
64 | }; | |
65 | ||
3b3009ea CL |
66 | /* netlink.c */ |
67 | int handshake_genl_notify(struct net *net, const struct handshake_proto *proto, | |
68 | gfp_t flags); | |
69 | struct nlmsghdr *handshake_genl_put(struct sk_buff *msg, | |
70 | struct genl_info *info); | |
71 | struct handshake_net *handshake_pernet(struct net *net); | |
72 | ||
73 | /* request.c */ | |
74 | struct handshake_req *handshake_req_alloc(const struct handshake_proto *proto, | |
75 | gfp_t flags); | |
76 | int handshake_req_hash_init(void); | |
77 | void handshake_req_hash_destroy(void); | |
78 | void *handshake_req_private(struct handshake_req *req); | |
79 | struct handshake_req *handshake_req_hash_lookup(struct sock *sk); | |
80 | struct handshake_req *handshake_req_next(struct handshake_net *hn, int class); | |
81 | int handshake_req_submit(struct socket *sock, struct handshake_req *req, | |
82 | gfp_t flags); | |
83 | void handshake_complete(struct handshake_req *req, unsigned int status, | |
84 | struct genl_info *info); | |
85 | bool handshake_req_cancel(struct sock *sk); | |
86 | ||
87 | #endif /* _INTERNAL_HANDSHAKE_H */ |