1 /*-
2 * Copyright (c) 2012 The FreeBSD Foundation
3 *
4 * This software was developed by Edward Tomasz Napierala under sponsorship
5 * from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29 /*-
30 * Copyright (c) 1982, 1986, 1989, 1990, 1993
31 * The Regents of the University of California. All rights reserved.
32 *
33 * sendfile(2) and related extensions:
34 * Copyright (c) 1998, David Greenman. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94
61 */
62
63 /*
64 * iSCSI Common Layer, kernel proxy part.
65 */
66
67 #ifdef ICL_KERNEL_PROXY
68
69 #include <sys/cdefs.h>
70 __FBSDID("$FreeBSD$");
71
72 #include <sys/param.h>
73 #include <sys/capsicum.h>
74 #include <sys/condvar.h>
75 #include <sys/conf.h>
76 #include <sys/lock.h>
77 #include <sys/kernel.h>
78 #include <sys/kthread.h>
79 #include <sys/malloc.h>
80 #include <sys/mutex.h>
81 #include <sys/proc.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/sx.h>
85 #include <sys/systm.h>
86 #include <netinet/in.h>
87 #include <netinet/tcp.h>
88
89 #include <dev/iscsi/icl.h>
90
91 struct icl_listen_sock {
92 TAILQ_ENTRY(icl_listen_sock) ils_next;
93 struct icl_listen *ils_listen;
94 struct socket *ils_socket;
95 bool ils_running;
96 int ils_id;
97 };
98
99 struct icl_listen {
100 TAILQ_HEAD(, icl_listen_sock) il_sockets;
101 struct sx il_lock;
102 void (*il_accept)(struct socket *,
103 struct sockaddr *, int);
104 };
105
106 static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy");
107
108 int
109 icl_soft_proxy_connect(struct icl_conn *ic, int domain, int socktype,
110 int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
111 {
112 struct socket *so;
113 int error;
114
115 error = socreate(domain, &so, socktype, protocol,
116 curthread->td_ucred, curthread);
117 if (error != 0)
118 return (error);
119
120 if (from_sa != NULL) {
121 error = sobind(so, from_sa, curthread);
122 if (error != 0) {
123 soclose(so);
124 return (error);
125 }
126 }
127
128 error = soconnect(so, to_sa, curthread);
129 if (error != 0) {
130 soclose(so);
131 return (error);
132 }
133
134 SOCK_LOCK(so);
135 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
136 error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
137 "icl_connect", 0);
138 if (error)
139 break;
140 }
141 if (error == 0) {
142 error = so->so_error;
143 so->so_error = 0;
144 }
145 SOCK_UNLOCK(so);
146
147 if (error != 0) {
148 soclose(so);
149 return (error);
150 }
151
152 error = icl_soft_handoff_sock(ic, so);
153 if (error != 0)
154 soclose(so);
155
156 return (error);
157 }
158
159 struct icl_listen *
160 icl_listen_new(void (*accept_cb)(struct socket *, struct sockaddr *, int))
161 {
162 struct icl_listen *il;
163
164 il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK);
165 TAILQ_INIT(&il->il_sockets);
166 sx_init(&il->il_lock, "icl_listen");
167 il->il_accept = accept_cb;
168
169 return (il);
170 }
171
172 void
173 icl_listen_free(struct icl_listen *il)
174 {
175 struct icl_listen_sock *ils;
176 sbintime_t sbt, pr;
177
178 sx_xlock(&il->il_lock);
179 while (!TAILQ_EMPTY(&il->il_sockets)) {
180 ils = TAILQ_FIRST(&il->il_sockets);
181 while (ils->ils_running) {
182 ICL_DEBUG("waiting for accept thread to terminate");
183 sx_xunlock(&il->il_lock);
184 SOLISTEN_LOCK(ils->ils_socket);
185 ils->ils_socket->so_error = ENOTCONN;
186 SOLISTEN_UNLOCK(ils->ils_socket);
187 wakeup(&ils->ils_socket->so_timeo);
188 sbt = mstosbt(995);
189 pr = mstosbt(10);
190 pause_sbt("icl_unlisten", sbt, pr, 0);
191 sx_xlock(&il->il_lock);
192 }
193
194 TAILQ_REMOVE(&il->il_sockets, ils, ils_next);
195 soclose(ils->ils_socket);
196 free(ils, M_ICL_PROXY);
197 }
198 sx_xunlock(&il->il_lock);
199
200 free(il, M_ICL_PROXY);
201 }
202
203 /*
204 * XXX: Doing accept in a separate thread in each socket might not be the
205 * best way to do stuff, but it's pretty clean and debuggable - and you
206 * probably won't have hundreds of listening sockets anyway.
207 */
208 static void
209 icl_accept_thread(void *arg)
210 {
211 struct icl_listen_sock *ils;
212 struct socket *head, *so;
213 struct sockaddr *sa;
214 int error;
215
216 ils = arg;
217 head = ils->ils_socket;
218
219 ils->ils_running = true;
220
221 for (;;) {
222 SOLISTEN_LOCK(head);
223 error = solisten_dequeue(head, &so, 0);
224 if (error == ENOTCONN) {
225 /*
226 * XXXGL: ENOTCONN is our mark from icl_listen_free().
227 * Neither socket code, nor msleep(9) may return it.
228 */
229 ICL_DEBUG("terminating");
230 ils->ils_running = false;
231 kthread_exit();
232 return;
233 }
234 if (error) {
235 ICL_WARN("solisten_dequeue error %d", error);
236 continue;
237 }
238
239 sa = NULL;
240 error = soaccept(so, &sa);
241 if (error != 0) {
242 ICL_WARN("soaccept error %d", error);
243 if (sa != NULL)
244 free(sa, M_SONAME);
245 soclose(so);
246 continue;
247 }
248
249 (ils->ils_listen->il_accept)(so, sa, ils->ils_id);
250 }
251 }
252
253 static int
254 icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype,
255 int protocol, struct sockaddr *sa, int portal_id)
256 {
257 struct icl_listen_sock *ils;
258 struct socket *so;
259 struct sockopt sopt;
260 int error, one = 1;
261
262 error = socreate(domain, &so, socktype, protocol,
263 curthread->td_ucred, curthread);
264 if (error != 0) {
265 ICL_WARN("socreate failed with error %d", error);
266 return (error);
267 }
268
269 sopt.sopt_dir = SOPT_SET;
270 sopt.sopt_level = SOL_SOCKET;
271 sopt.sopt_name = SO_REUSEADDR;
272 sopt.sopt_val = &one;
273 sopt.sopt_valsize = sizeof(one);
274 sopt.sopt_td = NULL;
275 error = sosetopt(so, &sopt);
276 if (error != 0) {
277 ICL_WARN("failed to set SO_REUSEADDR with error %d", error);
278 soclose(so);
279 return (error);
280 }
281
282 error = sobind(so, sa, curthread);
283 if (error != 0) {
284 ICL_WARN("sobind failed with error %d", error);
285 soclose(so);
286 return (error);
287 }
288
289 error = solisten(so, -1, curthread);
290 if (error != 0) {
291 ICL_WARN("solisten failed with error %d", error);
292 soclose(so);
293 return (error);
294 }
295
296 ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK);
297 ils->ils_listen = il;
298 ils->ils_socket = so;
299 ils->ils_id = portal_id;
300
301 error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc");
302 if (error != 0) {
303 ICL_WARN("kthread_add failed with error %d", error);
304 soclose(so);
305 free(ils, M_ICL_PROXY);
306
307 return (error);
308 }
309
310 sx_xlock(&il->il_lock);
311 TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next);
312 sx_xunlock(&il->il_lock);
313
314 return (0);
315 }
316
317 int
318 icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype,
319 int protocol, struct sockaddr *sa, int portal_id)
320 {
321
322 if (rdma) {
323 ICL_DEBUG("RDMA not supported");
324 return (EOPNOTSUPP);
325 }
326
327 return (icl_listen_add_tcp(il, domain, socktype, protocol, sa,
328 portal_id));
329 }
330
331 int
332 icl_listen_remove(struct icl_listen *il, struct sockaddr *sa)
333 {
334
335 /*
336 * XXX
337 */
338
339 return (EOPNOTSUPP);
340 }
341
342 #endif /* ICL_KERNEL_PROXY */
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