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 #include <sys/param.h>
71 #include <sys/capsicum.h>
72 #include <sys/condvar.h>
73 #include <sys/conf.h>
74 #include <sys/lock.h>
75 #include <sys/kernel.h>
76 #include <sys/kthread.h>
77 #include <sys/malloc.h>
78 #include <sys/mutex.h>
79 #include <sys/proc.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/sx.h>
83 #include <sys/systm.h>
84 #include <netinet/in.h>
85 #include <netinet/tcp.h>
86
87 #include <dev/iscsi/icl.h>
88
89 struct icl_listen_sock {
90 TAILQ_ENTRY(icl_listen_sock) ils_next;
91 struct icl_listen *ils_listen;
92 struct socket *ils_socket;
93 bool ils_running;
94 int ils_id;
95 };
96
97 struct icl_listen {
98 TAILQ_HEAD(, icl_listen_sock) il_sockets;
99 struct sx il_lock;
100 void (*il_accept)(struct socket *,
101 struct sockaddr *, int);
102 };
103
104 static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy");
105
106 int
icl_soft_proxy_connect(struct icl_conn * ic,int domain,int socktype,int protocol,struct sockaddr * from_sa,struct sockaddr * to_sa)107 icl_soft_proxy_connect(struct icl_conn *ic, int domain, int socktype,
108 int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
109 {
110 struct socket *so;
111 int error;
112
113 error = socreate(domain, &so, socktype, protocol,
114 curthread->td_ucred, curthread);
115 if (error != 0)
116 return (error);
117
118 if (from_sa != NULL) {
119 error = sobind(so, from_sa, curthread);
120 if (error != 0) {
121 soclose(so);
122 return (error);
123 }
124 }
125
126 error = soconnect(so, to_sa, curthread);
127 if (error != 0) {
128 soclose(so);
129 return (error);
130 }
131
132 SOCK_LOCK(so);
133 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
134 error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
135 "icl_connect", 0);
136 if (error)
137 break;
138 }
139 if (error == 0) {
140 error = so->so_error;
141 so->so_error = 0;
142 }
143 SOCK_UNLOCK(so);
144
145 if (error != 0) {
146 soclose(so);
147 return (error);
148 }
149
150 error = icl_soft_handoff_sock(ic, so);
151 if (error != 0)
152 soclose(so);
153
154 return (error);
155 }
156
157 struct icl_listen *
icl_listen_new(void (* accept_cb)(struct socket *,struct sockaddr *,int))158 icl_listen_new(void (*accept_cb)(struct socket *, struct sockaddr *, int))
159 {
160 struct icl_listen *il;
161
162 il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK);
163 TAILQ_INIT(&il->il_sockets);
164 sx_init(&il->il_lock, "icl_listen");
165 il->il_accept = accept_cb;
166
167 return (il);
168 }
169
170 void
icl_listen_free(struct icl_listen * il)171 icl_listen_free(struct icl_listen *il)
172 {
173 struct icl_listen_sock *ils;
174 sbintime_t sbt, pr;
175
176 sx_xlock(&il->il_lock);
177 while (!TAILQ_EMPTY(&il->il_sockets)) {
178 ils = TAILQ_FIRST(&il->il_sockets);
179 while (ils->ils_running) {
180 ICL_DEBUG("waiting for accept thread to terminate");
181 sx_xunlock(&il->il_lock);
182 SOLISTEN_LOCK(ils->ils_socket);
183 ils->ils_socket->so_error = ENOTCONN;
184 SOLISTEN_UNLOCK(ils->ils_socket);
185 wakeup(&ils->ils_socket->so_timeo);
186 sbt = mstosbt(995);
187 pr = mstosbt(10);
188 pause_sbt("icl_unlisten", sbt, pr, 0);
189 sx_xlock(&il->il_lock);
190 }
191
192 TAILQ_REMOVE(&il->il_sockets, ils, ils_next);
193 soclose(ils->ils_socket);
194 free(ils, M_ICL_PROXY);
195 }
196 sx_xunlock(&il->il_lock);
197
198 free(il, M_ICL_PROXY);
199 }
200
201 /*
202 * XXX: Doing accept in a separate thread in each socket might not be the
203 * best way to do stuff, but it's pretty clean and debuggable - and you
204 * probably won't have hundreds of listening sockets anyway.
205 */
206 static void
icl_accept_thread(void * arg)207 icl_accept_thread(void *arg)
208 {
209 struct icl_listen_sock *ils;
210 struct socket *head, *so;
211 struct sockaddr *sa;
212 int error;
213
214 ils = arg;
215 head = ils->ils_socket;
216
217 ils->ils_running = true;
218
219 for (;;) {
220 SOLISTEN_LOCK(head);
221 error = solisten_dequeue(head, &so, 0);
222 if (error == ENOTCONN) {
223 /*
224 * XXXGL: ENOTCONN is our mark from icl_listen_free().
225 * Neither socket code, nor msleep(9) may return it.
226 */
227 ICL_DEBUG("terminating");
228 ils->ils_running = false;
229 kthread_exit();
230 return;
231 }
232 if (error) {
233 ICL_WARN("solisten_dequeue error %d", error);
234 continue;
235 }
236
237 sa = NULL;
238 error = soaccept(so, &sa);
239 if (error != 0) {
240 ICL_WARN("soaccept error %d", error);
241 if (sa != NULL)
242 free(sa, M_SONAME);
243 soclose(so);
244 continue;
245 }
246
247 (ils->ils_listen->il_accept)(so, sa, ils->ils_id);
248 }
249 }
250
251 static int
icl_listen_add_tcp(struct icl_listen * il,int domain,int socktype,int protocol,struct sockaddr * sa,int portal_id)252 icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype,
253 int protocol, struct sockaddr *sa, int portal_id)
254 {
255 struct icl_listen_sock *ils;
256 struct socket *so;
257 struct sockopt sopt;
258 int error, one = 1;
259
260 error = socreate(domain, &so, socktype, protocol,
261 curthread->td_ucred, curthread);
262 if (error != 0) {
263 ICL_WARN("socreate failed with error %d", error);
264 return (error);
265 }
266
267 sopt.sopt_dir = SOPT_SET;
268 sopt.sopt_level = SOL_SOCKET;
269 sopt.sopt_name = SO_REUSEADDR;
270 sopt.sopt_val = &one;
271 sopt.sopt_valsize = sizeof(one);
272 sopt.sopt_td = NULL;
273 error = sosetopt(so, &sopt);
274 if (error != 0) {
275 ICL_WARN("failed to set SO_REUSEADDR with error %d", error);
276 soclose(so);
277 return (error);
278 }
279
280 error = sobind(so, sa, curthread);
281 if (error != 0) {
282 ICL_WARN("sobind failed with error %d", error);
283 soclose(so);
284 return (error);
285 }
286
287 error = solisten(so, -1, curthread);
288 if (error != 0) {
289 ICL_WARN("solisten failed with error %d", error);
290 soclose(so);
291 return (error);
292 }
293
294 ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK);
295 ils->ils_listen = il;
296 ils->ils_socket = so;
297 ils->ils_id = portal_id;
298
299 error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc");
300 if (error != 0) {
301 ICL_WARN("kthread_add failed with error %d", error);
302 soclose(so);
303 free(ils, M_ICL_PROXY);
304
305 return (error);
306 }
307
308 sx_xlock(&il->il_lock);
309 TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next);
310 sx_xunlock(&il->il_lock);
311
312 return (0);
313 }
314
315 int
icl_listen_add(struct icl_listen * il,bool rdma,int domain,int socktype,int protocol,struct sockaddr * sa,int portal_id)316 icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype,
317 int protocol, struct sockaddr *sa, int portal_id)
318 {
319
320 if (rdma) {
321 ICL_DEBUG("RDMA not supported");
322 return (EOPNOTSUPP);
323 }
324
325 return (icl_listen_add_tcp(il, domain, socktype, protocol, sa,
326 portal_id));
327 }
328
329 int
icl_listen_remove(struct icl_listen * il,struct sockaddr * sa)330 icl_listen_remove(struct icl_listen *il, struct sockaddr *sa)
331 {
332
333 /*
334 * XXX
335 */
336
337 return (EOPNOTSUPP);
338 }
339
340 #endif /* ICL_KERNEL_PROXY */
341