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gerrit-public.fairphone.software / kernel / msm-4.9 / ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 / . / include / net / kcm.h
blob: 1bcae39070eca685ee468a1a5e9580e43d4a9600 [file] [log] [blame]
Tom Herbertab7ac4e2016-03-07 14:11:06 -0800[diff] [blame^]1/*
2 * Kernel Connection Multiplexor
3 *
4 * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 */
10
11#ifndef __NET_KCM_H_
12#define __NET_KCM_H_
13
14#include <linux/skbuff.h>
15#include <net/sock.h>
16#include <uapi/linux/kcm.h>
17
18extern unsigned int kcm_net_id;
19
20struct kcm_tx_msg {
21 unsigned int sent;
22 unsigned int fragidx;
23 unsigned int frag_offset;
24 unsigned int msg_flags;
25 struct sk_buff *frag_skb;
26 struct sk_buff *last_skb;
27};
28
29struct kcm_rx_msg {
30 int full_len;
31 int accum_len;
32 int offset;
33};
34
35/* Socket structure for KCM client sockets */
36struct kcm_sock {
37 struct sock sk;
38 struct kcm_mux *mux;
39 struct list_head kcm_sock_list;
40 int index;
41 u32 done : 1;
42 struct work_struct done_work;
43
44 /* Transmit */
45 struct kcm_psock *tx_psock;
46 struct work_struct tx_work;
47 struct list_head wait_psock_list;
48 struct sk_buff *seq_skb;
49
50 /* Don't use bit fields here, these are set under different locks */
51 bool tx_wait;
52 bool tx_wait_more;
53
54 /* Receive */
55 struct kcm_psock *rx_psock;
56 struct list_head wait_rx_list; /* KCMs waiting for receiving */
57 bool rx_wait;
58 u32 rx_disabled : 1;
59};
60
61struct bpf_prog;
62
63/* Structure for an attached lower socket */
64struct kcm_psock {
65 struct sock *sk;
66 struct kcm_mux *mux;
67 int index;
68
69 u32 tx_stopped : 1;
70 u32 rx_stopped : 1;
71 u32 done : 1;
72 u32 unattaching : 1;
73
74 void (*save_state_change)(struct sock *sk);
75 void (*save_data_ready)(struct sock *sk);
76 void (*save_write_space)(struct sock *sk);
77
78 struct list_head psock_list;
79
80 /* Receive */
81 struct sk_buff *rx_skb_head;
82 struct sk_buff **rx_skb_nextp;
83 struct sk_buff *ready_rx_msg;
84 struct list_head psock_ready_list;
85 struct work_struct rx_work;
86 struct delayed_work rx_delayed_work;
87 struct bpf_prog *bpf_prog;
88 struct kcm_sock *rx_kcm;
89
90 /* Transmit */
91 struct kcm_sock *tx_kcm;
92 struct list_head psock_avail_list;
93};
94
95/* Per net MUX list */
96struct kcm_net {
97 struct mutex mutex;
98 struct list_head mux_list;
99 int count;
100};
101
102/* Structure for a MUX */
103struct kcm_mux {
104 struct list_head kcm_mux_list;
105 struct rcu_head rcu;
106 struct kcm_net *knet;
107
108 struct list_head kcm_socks; /* All KCM sockets on MUX */
109 int kcm_socks_cnt; /* Total KCM socket count for MUX */
110 struct list_head psocks; /* List of all psocks on MUX */
111 int psocks_cnt; /* Total attached sockets */
112
113 /* Receive */
114 spinlock_t rx_lock ____cacheline_aligned_in_smp;
115 struct list_head kcm_rx_waiters; /* KCMs waiting for receiving */
116 struct list_head psocks_ready; /* List of psocks with a msg ready */
117 struct sk_buff_head rx_hold_queue;
118
119 /* Transmit */
120 spinlock_t lock ____cacheline_aligned_in_smp; /* TX and mux locking */
121 struct list_head psocks_avail; /* List of available psocks */
122 struct list_head kcm_tx_waiters; /* KCMs waiting for a TX psock */
123};
124
125#endif /* __NET_KCM_H_ */