1 | /* |
2 | * Copyright (c) 2015-2020 Apple Computer, Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
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13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
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23 | * Please see the License for the specific language governing rights and |
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26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * File: ipc/flipc.h |
30 | * Author: Dean Reece |
31 | * Date: 2016 |
32 | * |
33 | * Definitions for fast local ipc (flipc). |
34 | */ |
35 | |
36 | #ifndef _IPC_FLIPC_H_ |
37 | #define _IPC_FLIPC_H_ |
38 | |
39 | #if MACH_KERNEL_PRIVATE && MACH_FLIPC |
40 | |
41 | #include <kern/mach_node.h> |
42 | #include <ipc/ipc_kmsg.h> |
43 | #include <sys/cdefs.h> |
44 | |
45 | __BEGIN_DECLS |
46 | |
47 | |
48 | /*** FLIPC Port Declarations ***/ |
49 | |
50 | /* A FLIPC port (flipc_port_t) is a companion structure to ipc_port_t. |
51 | * Any ipc_port object that is known to the flipc layer has one of these |
52 | * structures to maintain the state of the port with respect to flipc. |
53 | * When a port reverts to a purely local object (all rights for the port exist |
54 | * on a single node) the flipc port companion structure will be de-allocated. |
55 | */ |
56 | |
57 | typedef struct flipc_port { |
58 | struct mnl_obj obj; // Necessary to be in mnl_name_table[] |
59 | ipc_port_t lport; // The associated local ipc_port |
60 | mach_node_t hostnode; // Node holding the recieve right |
61 | uint32_t peek_count; // How many kmsgs in mq have been peeked |
62 | uint32_t state:3;// See FPORT_STATE_* defines below |
63 | } *flipc_port_t; |
64 | |
65 | #define FPORT_NULL ((flipc_port_t) 0UL) |
66 | #define FPORT_VALID(fport) ((fport) != FPORT_NULL) |
67 | |
68 | #define FPORT_STATE_INIT (0) // Port is being initialized |
69 | #define FPORT_STATE_PROXY (1) // Principal is on another node |
70 | #define FPORT_STATE_PRINCIPAL (2) // Principal is on this node |
71 | #define FPORT_STATE_PREPRINCIPAL (3) // Principal moving to this node |
72 | #define FPORT_STATE_POSTPRINCIPAL (4) // Principal moving to other node |
73 | #define FPORT_STATE_DEAD (5) // Port is being destroyed |
74 | |
75 | |
76 | /*** FLIPC Node Managment Declarations (used by mach node layer) ***/ |
77 | |
78 | extern mach_node_id_t localnode_id; // This node's FLIPC id. |
79 | |
80 | /* flipc_node_prepare() is called by mach node layer when a remote node is |
81 | * registered by a link driver. This is the flipc layer's opportunity to |
82 | * convert it to a flipc port and hook it into any appropriate structures. |
83 | * Note that the node is not yet in the mach node table. Returns KERN_SUCCESS |
84 | * on success; otherwise node is not prepared and cannot be used. |
85 | */ |
86 | kern_return_t flipc_node_prepare(mach_node_t node); |
87 | |
88 | /* flipc_node_retire() is called by mach node layer when a remote node is |
89 | * terminated by a link driver. This is the flipc layer's opportunity to |
90 | * convert it back to a local port and unhook it into any structures. |
91 | * Returns KERN_SUCCESS on success. |
92 | */ |
93 | kern_return_t flipc_node_retire(mach_node_t node); |
94 | |
95 | |
96 | /*** FLIPC Message Declarations (used by mach node layer) ***/ |
97 | |
98 | /* Definition for a flipc ack/nak message. These messages are sent to the |
99 | * originating node of a message to ack or nak the message. Ack'd messages |
100 | * are destroyed by the originating node (to avoid duplicate delivery). Nak'd |
101 | * messages are re-sent to the node specified in <resend_to> (used when a |
102 | * receive right moves to a different node). These messages are queued onto |
103 | * the originating node's control_port and sent along with other ipc traffic. |
104 | */ |
105 | |
106 | typedef struct flipc_ack_msg { |
107 | struct mnl_msg mnl; // Flipc message starts with mnl message |
108 | mach_node_id_t resend_to; // Node ID for resends (if NAK) |
109 | uint8_t msg_count; // Number of msgs being ackd/nakd |
110 | } __attribute__((__packed__)) * flipc_ack_msg_t; |
111 | |
112 | #define FLIPC_CMD_ID (0x43504952UL) // msgh_id "RIPC" for FLIPC msgs |
113 | #define FLIPC_CMD_IPCMESSAGE (1) // IPC Msg: <node> is sender; <fname> is dest port |
114 | #define FLIPC_CMD_ACKMESSAGE (2) // <fname> is port being ack'd |
115 | #define FLIPC_CMD_NAKMESSAGE (3) // <fname> is port being nak'd |
116 | |
117 | |
118 | /* The node layer calls flipc_msg_to_remote_node() to fetch the next message |
119 | * for <to_node>. This function will block until a message is available or the |
120 | * node is terminated, in which case it returns MNL_MSG_NULL. |
121 | */ |
122 | mnl_msg_t flipc_msg_to_remote_node(mach_node_t to_node, |
123 | uint32_t flags); |
124 | |
125 | /* The node layer calls flipc_msg_to_remote_node() to post the next message |
126 | * from <from_node>. This function will block until a message is available |
127 | * or the node is terminated, in which case it returns MNL_MSG_NULL. |
128 | */ |
129 | void flipc_msg_from_node(mach_node_t from_node, |
130 | mnl_msg_t msg_arg, |
131 | uint32_t flags); |
132 | |
133 | /* The node layer calls flipc_msg_free() to dispose of sent messages that |
134 | * originated in the FLIPC layer. |
135 | */ |
136 | void flipc_msg_free(mnl_msg_t msg, |
137 | uint32_t flags); |
138 | |
139 | |
140 | /*** FLIPC Message Declarations (used by mach ipc subsystem) ***/ |
141 | |
142 | /* Ack a message sent by <mqueue> to <fport>. A new kmsg is allocated and |
143 | * filled in as an ack (or nak if <delivered> is false), then posted to the |
144 | * node's contol port. This will wake the link driver (if sleeping) and cause |
145 | * the ack to be included with normal IPC traffic. |
146 | * |
147 | * This function immediately returns if <fport> or <node> is invalid, so it |
148 | * is safe & quick to call speculatively. |
149 | * |
150 | * Called from mach ipc_mqueue.c when a flipc-originated message is consumed. |
151 | */ |
152 | void flipc_msg_ack(mach_node_t node, |
153 | ipc_mqueue_t mqueue, |
154 | boolean_t delivered); |
155 | |
156 | |
157 | __END_DECLS |
158 | |
159 | #endif // MACH_KERNEL_PRIVATE |
160 | #endif // _IPC_FLIPC_H_ |
161 | |