xref: /freebsd/sys/dev/iscsi/icl_soft_proxy.c (revision 36712a94975f5bd0d26c85377283b49a2369c82f)
1 /*-
2  * Copyright (c) 2012 The FreeBSD Foundation
3  * All rights reserved.
4  *
5  * This software was developed by Edward Tomasz Napierala under sponsorship
6  * from the FreeBSD Foundation.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  */
30 /*-
31  * Copyright (c) 1982, 1986, 1989, 1990, 1993
32  *	The Regents of the University of California.  All rights reserved.
33  *
34  * sendfile(2) and related extensions:
35  * Copyright (c) 1998, David Greenman. All rights reserved.
36  *
37  * Redistribution and use in source and binary forms, with or without
38  * modification, are permitted provided that the following conditions
39  * are met:
40  * 1. Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  * 2. Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in the
44  *    documentation and/or other materials provided with the distribution.
45  * 3. Neither the name of the University nor the names of its contributors
46  *    may be used to endorse or promote products derived from this software
47  *    without specific prior written permission.
48  *
49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59  * SUCH DAMAGE.
60  *
61  *	@(#)uipc_syscalls.c	8.4 (Berkeley) 2/21/94
62  */
63 
64 /*
65  * iSCSI Common Layer, kernel proxy part.
66  */
67 
68 #ifdef ICL_KERNEL_PROXY
69 
70 #include <sys/cdefs.h>
71 __FBSDID("$FreeBSD$");
72 
73 #include <sys/param.h>
74 #include <sys/capsicum.h>
75 #include <sys/condvar.h>
76 #include <sys/conf.h>
77 #include <sys/lock.h>
78 #include <sys/kernel.h>
79 #include <sys/kthread.h>
80 #include <sys/malloc.h>
81 #include <sys/mutex.h>
82 #include <sys/proc.h>
83 #include <sys/socket.h>
84 #include <sys/socketvar.h>
85 #include <sys/sx.h>
86 #include <sys/systm.h>
87 #include <netinet/in.h>
88 #include <netinet/tcp.h>
89 
90 #include <dev/iscsi/icl.h>
91 
92 struct icl_listen_sock {
93 	TAILQ_ENTRY(icl_listen_sock)	ils_next;
94 	struct icl_listen		*ils_listen;
95 	struct socket			*ils_socket;
96 	bool				ils_running;
97 	int				ils_id;
98 };
99 
100 struct icl_listen	{
101 	TAILQ_HEAD(, icl_listen_sock)	il_sockets;
102 	struct sx			il_lock;
103 	void				(*il_accept)(struct socket *,
104 					    struct sockaddr *, int);
105 };
106 
107 static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy");
108 
109 int
110 icl_soft_proxy_connect(struct icl_conn *ic, int domain, int socktype,
111     int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
112 {
113 	struct socket *so;
114 	int error;
115 	int interrupted = 0;
116 
117 	error = socreate(domain, &so, socktype, protocol,
118 	    curthread->td_ucred, curthread);
119 	if (error != 0)
120 		return (error);
121 
122 	if (from_sa != NULL) {
123 		error = sobind(so, from_sa, curthread);
124 		if (error != 0) {
125 			soclose(so);
126 			return (error);
127 		}
128 	}
129 
130 	error = soconnect(so, to_sa, curthread);
131 	if (error != 0) {
132 		soclose(so);
133 		return (error);
134 	}
135 
136 	SOCK_LOCK(so);
137 	while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
138 		error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
139 		    "icl_connect", 0);
140 		if (error) {
141 			if (error == EINTR || error == ERESTART)
142 				interrupted = 1;
143 			break;
144 		}
145 	}
146 	if (error == 0) {
147 		error = so->so_error;
148 		so->so_error = 0;
149 	}
150 	SOCK_UNLOCK(so);
151 
152 	if (error != 0) {
153 		soclose(so);
154 		return (error);
155 	}
156 
157 	error = icl_soft_handoff_sock(ic, so);
158 	if (error != 0)
159 		soclose(so);
160 
161 	return (error);
162 }
163 
164 struct icl_listen *
165 icl_listen_new(void (*accept_cb)(struct socket *, struct sockaddr *, int))
166 {
167 	struct icl_listen *il;
168 
169 	il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK);
170 	TAILQ_INIT(&il->il_sockets);
171 	sx_init(&il->il_lock, "icl_listen");
172 	il->il_accept = accept_cb;
173 
174 	return (il);
175 }
176 
177 void
178 icl_listen_free(struct icl_listen *il)
179 {
180 	struct icl_listen_sock *ils;
181 
182 	sx_xlock(&il->il_lock);
183 	while (!TAILQ_EMPTY(&il->il_sockets)) {
184 		ils = TAILQ_FIRST(&il->il_sockets);
185 		while (ils->ils_running) {
186 			ICL_DEBUG("waiting for accept thread to terminate");
187 			sx_xunlock(&il->il_lock);
188 			SOLISTEN_LOCK(ils->ils_socket);
189 			ils->ils_socket->so_error = ENOTCONN;
190 			SOLISTEN_UNLOCK(ils->ils_socket);
191 			wakeup(&ils->ils_socket->so_timeo);
192 			pause("icl_unlisten", 1 * hz);
193 			sx_xlock(&il->il_lock);
194 		}
195 
196 		TAILQ_REMOVE(&il->il_sockets, ils, ils_next);
197 		soclose(ils->ils_socket);
198 		free(ils, M_ICL_PROXY);
199 	}
200 	sx_xunlock(&il->il_lock);
201 
202 	free(il, M_ICL_PROXY);
203 }
204 
205 /*
206  * XXX: Doing accept in a separate thread in each socket might not be the
207  * best way to do stuff, but it's pretty clean and debuggable - and you
208  * probably won't have hundreds of listening sockets anyway.
209  */
210 static void
211 icl_accept_thread(void *arg)
212 {
213 	struct icl_listen_sock *ils;
214 	struct socket *head, *so;
215 	struct sockaddr *sa;
216 	int error;
217 
218 	ils = arg;
219 	head = ils->ils_socket;
220 
221 	ils->ils_running = true;
222 
223 	for (;;) {
224 		SOLISTEN_LOCK(head);
225 		error = solisten_dequeue(head, &so, 0);
226 		if (error == ENOTCONN) {
227 			/*
228 			 * XXXGL: ENOTCONN is our mark from icl_listen_free().
229 			 * Neither socket code, nor msleep(9) may return it.
230 			 */
231 			ICL_DEBUG("terminating");
232 			ils->ils_running = false;
233 			kthread_exit();
234 			return;
235 		}
236 		if (error) {
237 			ICL_WARN("solisten_dequeue error %d", error);
238 			continue;
239 		}
240 
241 		sa = NULL;
242 		error = soaccept(so, &sa);
243 		if (error != 0) {
244 			ICL_WARN("soaccept error %d", error);
245 			if (sa != NULL)
246 				free(sa, M_SONAME);
247 			soclose(so);
248 			continue;
249 		}
250 
251 		(ils->ils_listen->il_accept)(so, sa, ils->ils_id);
252 	}
253 }
254 
255 static int
256 icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype,
257     int protocol, struct sockaddr *sa, int portal_id)
258 {
259 	struct icl_listen_sock *ils;
260 	struct socket *so;
261 	struct sockopt sopt;
262 	int error, one = 1;
263 
264 	error = socreate(domain, &so, socktype, protocol,
265 	    curthread->td_ucred, curthread);
266 	if (error != 0) {
267 		ICL_WARN("socreate failed with error %d", error);
268 		return (error);
269 	}
270 
271 	sopt.sopt_dir = SOPT_SET;
272 	sopt.sopt_level = SOL_SOCKET;
273 	sopt.sopt_name = SO_REUSEADDR;
274 	sopt.sopt_val = &one;
275 	sopt.sopt_valsize = sizeof(one);
276 	sopt.sopt_td = NULL;
277 	error = sosetopt(so, &sopt);
278 	if (error != 0) {
279 		ICL_WARN("failed to set SO_REUSEADDR with error %d", error);
280 		soclose(so);
281 		return (error);
282 	}
283 
284 	error = sobind(so, sa, curthread);
285 	if (error != 0) {
286 		ICL_WARN("sobind failed with error %d", error);
287 		soclose(so);
288 		return (error);
289 	}
290 
291 	error = solisten(so, -1, curthread);
292 	if (error != 0) {
293 		ICL_WARN("solisten failed with error %d", error);
294 		soclose(so);
295 		return (error);
296 	}
297 
298 	ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK);
299 	ils->ils_listen = il;
300 	ils->ils_socket = so;
301 	ils->ils_id = portal_id;
302 
303 	error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc");
304 	if (error != 0) {
305 		ICL_WARN("kthread_add failed with error %d", error);
306 		soclose(so);
307 		free(ils, M_ICL_PROXY);
308 
309 		return (error);
310 	}
311 
312 	sx_xlock(&il->il_lock);
313 	TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next);
314 	sx_xunlock(&il->il_lock);
315 
316 	return (0);
317 }
318 
319 int
320 icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype,
321     int protocol, struct sockaddr *sa, int portal_id)
322 {
323 
324 	if (rdma) {
325 		ICL_DEBUG("RDMA not supported");
326 		return (EOPNOTSUPP);
327 	}
328 
329 
330 	return (icl_listen_add_tcp(il, domain, socktype, protocol, sa,
331 	    portal_id));
332 }
333 
334 int
335 icl_listen_remove(struct icl_listen *il, struct sockaddr *sa)
336 {
337 
338 	/*
339 	 * XXX
340 	 */
341 
342 	return (EOPNOTSUPP);
343 }
344 
345 #endif /* ICL_KERNEL_PROXY */
346