1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright 2019 OmniOS Community Edition (OmniOSce) Association.
24  * Copyright 2020 Joyent, Inc.
25  */
26 
27 #ifndef _SYS_SOCKET_PROTO_H_
28 #define	_SYS_SOCKET_PROTO_H_
29 
30 #ifdef	__cplusplus
31 extern "C" {
32 #endif
33 
34 #include <sys/socket.h>
35 #include <sys/stream.h>
36 #include <sys/vnode.h>
37 
38 /*
39  * Generation count
40  */
41 typedef uint64_t sock_connid_t;
42 
43 #define	SOCK_CONNID_INIT(id) {	\
44 	(id) = 0;		\
45 }
46 #define	SOCK_CONNID_BUMP(id)		(++(id))
47 #define	SOCK_CONNID_LT(id1, id2)	((int64_t)((id1)-(id2)) < 0)
48 
49 /* Socket protocol properties */
50 struct sock_proto_props {
51 	uint_t sopp_flags;		/* options to set */
52 	ushort_t sopp_wroff;		/* write offset */
53 	ssize_t sopp_txhiwat;		/* tx hi water mark */
54 	ssize_t sopp_txlowat;		/* tx lo water mark */
55 	ssize_t	sopp_rxhiwat;		/* recv high water mark */
56 	ssize_t	sopp_rxlowat;		/* recv low water mark */
57 	ssize_t sopp_maxblk;		/* maximum message block size */
58 	ssize_t sopp_maxpsz;		/* maximum packet size */
59 	ssize_t sopp_minpsz;		/* minimum packet size */
60 	ushort_t sopp_tail;		/* space available at the end */
61 	uint_t	sopp_zcopyflag;		/* zero copy flag */
62 	boolean_t sopp_oobinline;	/* OOB inline */
63 	uint_t sopp_rcvtimer;		/* delayed recv notification (time) */
64 	uint32_t sopp_rcvthresh;	/* delayed recv notification (bytes) */
65 	socklen_t sopp_maxaddrlen;	/* maximum size of protocol address */
66 	boolean_t sopp_loopback;	/* loopback connection */
67 };
68 
69 /* flags to determine which socket options are set */
70 #define	SOCKOPT_WROFF		0x0001	/* set write offset */
71 #define	SOCKOPT_RCVHIWAT	0x0002	/* set read side high water */
72 #define	SOCKOPT_RCVLOWAT	0x0004	/* set read side high water */
73 #define	SOCKOPT_MAXBLK		0x0008	/* set maximum message block size */
74 #define	SOCKOPT_TAIL		0x0010	/* set the extra allocated space */
75 #define	SOCKOPT_ZCOPY		0x0020	/* set/unset zero copy for sendfile */
76 #define	SOCKOPT_MAXPSZ		0x0040	/* set maxpsz for protocols */
77 #define	SOCKOPT_OOBINLINE	0x0080	/* set oob inline processing */
78 #define	SOCKOPT_RCVTIMER	0x0100
79 #define	SOCKOPT_RCVTHRESH	0x0200
80 #define	SOCKOPT_MAXADDRLEN	0x0400	/* set max address length */
81 #define	SOCKOPT_MINPSZ		0x0800	/* set minpsz for protocols */
82 #define	SOCKOPT_LOOPBACK	0x1000	/* set loopback */
83 
84 #define	IS_SO_OOB_INLINE(so)	((so)->so_proto_props.sopp_oobinline)
85 
86 #ifdef _KERNEL
87 
88 struct T_capability_ack;
89 
90 typedef struct sock_upcalls_s sock_upcalls_t;
91 typedef struct sock_downcalls_s sock_downcalls_t;
92 
93 /*
94  * Upcall and downcall handle for sockfs and transport layer.
95  */
96 typedef struct __sock_upper_handle *sock_upper_handle_t;
97 typedef struct __sock_lower_handle *sock_lower_handle_t;
98 
99 struct sock_downcalls_s {
100 	void	(*sd_activate)(sock_lower_handle_t, sock_upper_handle_t,
101 		    sock_upcalls_t *, int, cred_t *);
102 	int	(*sd_accept)(sock_lower_handle_t, sock_lower_handle_t,
103 		    sock_upper_handle_t, cred_t *);
104 	int	(*sd_bind)(sock_lower_handle_t, struct sockaddr *, socklen_t,
105 		    cred_t *);
106 	int	(*sd_listen)(sock_lower_handle_t, int, cred_t *);
107 	int	(*sd_connect)(sock_lower_handle_t, const struct sockaddr *,
108 		    socklen_t, sock_connid_t *, cred_t *);
109 	int	(*sd_getpeername)(sock_lower_handle_t, struct sockaddr *,
110 		    socklen_t *, cred_t *);
111 	int	(*sd_getsockname)(sock_lower_handle_t, struct sockaddr *,
112 		    socklen_t *, cred_t *);
113 	int	(*sd_getsockopt)(sock_lower_handle_t, int, int, void *,
114 		    socklen_t *, cred_t *);
115 	int	(*sd_setsockopt)(sock_lower_handle_t, int, int, const void *,
116 		    socklen_t, cred_t *);
117 	int	(*sd_send)(sock_lower_handle_t, mblk_t *, struct nmsghdr *,
118 		    cred_t *);
119 	int	(*sd_send_uio)(sock_lower_handle_t, uio_t *, struct nmsghdr *,
120 		    cred_t *);
121 	int	(*sd_recv_uio)(sock_lower_handle_t, uio_t *, struct nmsghdr *,
122 		    cred_t *);
123 	short	(*sd_poll)(sock_lower_handle_t, short, int, cred_t *);
124 	int	(*sd_shutdown)(sock_lower_handle_t, int, cred_t *);
125 	void	(*sd_clr_flowctrl)(sock_lower_handle_t);
126 	int	(*sd_ioctl)(sock_lower_handle_t, int, intptr_t, int,
127 		    int32_t *, cred_t *);
128 	int	(*sd_close)(sock_lower_handle_t, int, cred_t *);
129 };
130 
131 typedef sock_lower_handle_t (*so_proto_create_func_t)(int, int, int,
132     sock_downcalls_t **, uint_t *, int *, int, cred_t *);
133 
134 typedef struct sock_quiesce_arg {
135 	mblk_t *soqa_exdata_mp;
136 	mblk_t *soqa_urgmark_mp;
137 } sock_quiesce_arg_t;
138 typedef mblk_t *(*so_proto_quiesced_cb_t)(sock_upper_handle_t,
139     sock_quiesce_arg_t *, struct T_capability_ack *, struct sockaddr *,
140     socklen_t, struct sockaddr *, socklen_t, short);
141 typedef int (*so_proto_fallback_func_t)(sock_lower_handle_t, queue_t *,
142     boolean_t, so_proto_quiesced_cb_t, sock_quiesce_arg_t *);
143 
144 /*
145  * These functions return EOPNOTSUPP and are intended for the sockfs
146  * developer that doesn't wish to supply stubs for every function themselves.
147  */
148 extern int sock_accept_notsupp(sock_lower_handle_t, sock_lower_handle_t,
149     sock_upper_handle_t, cred_t *);
150 extern int sock_bind_notsupp(sock_lower_handle_t, struct sockaddr *,
151     socklen_t, cred_t *);
152 extern int sock_listen_notsupp(sock_lower_handle_t, int, cred_t *);
153 extern int sock_connect_notsupp(sock_lower_handle_t,
154     const struct sockaddr *, socklen_t, sock_connid_t *, cred_t *);
155 extern int sock_getpeername_notsupp(sock_lower_handle_t, struct sockaddr *,
156     socklen_t *, cred_t *);
157 extern int sock_getsockname_notsupp(sock_lower_handle_t, struct sockaddr *,
158     socklen_t *, cred_t *);
159 extern int sock_getsockopt_notsupp(sock_lower_handle_t, int, int, void *,
160     socklen_t *, cred_t *);
161 extern int sock_setsockopt_notsupp(sock_lower_handle_t, int, int,
162     const void *, socklen_t, cred_t *);
163 extern int sock_send_notsupp(sock_lower_handle_t, mblk_t *,
164     struct nmsghdr *, cred_t *);
165 extern int sock_send_uio_notsupp(sock_lower_handle_t, uio_t *,
166     struct nmsghdr *, cred_t *);
167 extern int sock_recv_uio_notsupp(sock_lower_handle_t, uio_t *,
168     struct nmsghdr *, cred_t *);
169 extern short sock_poll_notsupp(sock_lower_handle_t, short, int, cred_t *);
170 extern int sock_shutdown_notsupp(sock_lower_handle_t, int, cred_t *);
171 extern void sock_clr_flowctrl_notsupp(sock_lower_handle_t);
172 extern int sock_ioctl_notsupp(sock_lower_handle_t, int, intptr_t, int,
173     int32_t *, cred_t *);
174 extern int sock_close_notsupp(sock_lower_handle_t, int, cred_t *);
175 
176 /*
177  * Upcalls and related information
178  */
179 
180 /*
181  * su_opctl() actions
182  */
183 typedef enum sock_opctl_action {
184 	SOCK_OPCTL_ENAB_ACCEPT = 0,
185 	SOCK_OPCTL_SHUT_SEND,
186 	SOCK_OPCTL_SHUT_RECV
187 } sock_opctl_action_t;
188 
189 struct sock_upcalls_s {
190 	sock_upper_handle_t (*su_newconn)(sock_upper_handle_t,
191 	    sock_lower_handle_t, sock_downcalls_t *, cred_t *, pid_t,
192 	    sock_upcalls_t **);
193 	void	(*su_connected)(sock_upper_handle_t, sock_connid_t, cred_t *,
194 	    pid_t);
195 	int	(*su_disconnected)(sock_upper_handle_t, sock_connid_t, int);
196 	void	(*su_opctl)(sock_upper_handle_t, sock_opctl_action_t,
197 	    uintptr_t);
198 	ssize_t	(*su_recv)(sock_upper_handle_t, mblk_t *, size_t, int,
199 		    int *, boolean_t *);
200 	void	(*su_set_proto_props)(sock_upper_handle_t,
201 		    struct sock_proto_props *);
202 	void	(*su_txq_full)(sock_upper_handle_t, boolean_t);
203 	void	(*su_signal_oob)(sock_upper_handle_t, ssize_t);
204 	void	(*su_zcopy_notify)(sock_upper_handle_t);
205 	void	(*su_set_error)(sock_upper_handle_t, int);
206 	/*
207 	 * NOTE: This function frees upper handle items. Caller cannot
208 	 * rely on them after this upcall.
209 	 */
210 	void	(*su_closed)(sock_upper_handle_t);
211 	/*
212 	 * NOTE: This function MUST be implemented without using lower-level
213 	 * downcalls or accesses. This allows callers to ensure su_closed()
214 	 * upcalls can happen indepdently or concurrently.
215 	 */
216 	vnode_t *(*su_get_vnode)(sock_upper_handle_t);
217 };
218 
219 #define	SOCK_UC_VERSION		sizeof (sock_upcalls_t)
220 #define	SOCK_DC_VERSION		sizeof (sock_downcalls_t)
221 
222 #define	SOCKET_RECVHIWATER	(48 * 1024)
223 #define	SOCKET_RECVLOWATER	1024
224 
225 #define	SOCKET_NO_RCVTIMER	0
226 #define	SOCKET_TIMER_INTERVAL	50
227 
228 #endif /* _KERNEL */
229 
230 #ifdef	__cplusplus
231 }
232 #endif
233 
234 #endif /* _SYS_SOCKET_PROTO_H_ */
235