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
61 /*
62 * iSCSI Common Layer, kernel proxy part.
63 */
64
65 #ifdef ICL_KERNEL_PROXY
66
67 #include <sys/param.h>
68 #include <sys/capsicum.h>
69 #include <sys/condvar.h>
70 #include <sys/conf.h>
71 #include <sys/lock.h>
72 #include <sys/kernel.h>
73 #include <sys/kthread.h>
74 #include <sys/malloc.h>
75 #include <sys/mutex.h>
76 #include <sys/proc.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sx.h>
80 #include <sys/systm.h>
81 #include <netinet/in.h>
82 #include <netinet/tcp.h>
83
84 #include <dev/iscsi/icl.h>
85
86 struct icl_listen_sock {
87 TAILQ_ENTRY(icl_listen_sock) ils_next;
88 struct icl_listen *ils_listen;
89 struct socket *ils_socket;
90 bool ils_running;
91 int ils_id;
92 };
93
94 struct icl_listen {
95 TAILQ_HEAD(, icl_listen_sock) il_sockets;
96 struct sx il_lock;
97 void (*il_accept)(struct socket *,
98 struct sockaddr *, int);
99 };
100
101 static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy");
102
103 int
icl_soft_proxy_connect(struct icl_conn * ic,int domain,int socktype,int protocol,struct sockaddr * from_sa,struct sockaddr * to_sa)104 icl_soft_proxy_connect(struct icl_conn *ic, int domain, int socktype,
105 int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
106 {
107 struct socket *so;
108 int error;
109
110 error = socreate(domain, &so, socktype, protocol,
111 curthread->td_ucred, curthread);
112 if (error != 0)
113 return (error);
114
115 if (from_sa != NULL) {
116 error = sobind(so, from_sa, curthread);
117 if (error != 0) {
118 soclose(so);
119 return (error);
120 }
121 }
122
123 error = soconnect(so, to_sa, curthread);
124 if (error != 0) {
125 soclose(so);
126 return (error);
127 }
128
129 SOCK_LOCK(so);
130 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
131 error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
132 "icl_connect", 0);
133 if (error)
134 break;
135 }
136 if (error == 0) {
137 error = so->so_error;
138 so->so_error = 0;
139 }
140 SOCK_UNLOCK(so);
141
142 if (error != 0) {
143 soclose(so);
144 return (error);
145 }
146
147 error = icl_soft_handoff_sock(ic, so);
148 if (error != 0)
149 soclose(so);
150
151 return (error);
152 }
153
154 struct icl_listen *
icl_listen_new(void (* accept_cb)(struct socket *,struct sockaddr *,int))155 icl_listen_new(void (*accept_cb)(struct socket *, struct sockaddr *, int))
156 {
157 struct icl_listen *il;
158
159 il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK);
160 TAILQ_INIT(&il->il_sockets);
161 sx_init(&il->il_lock, "icl_listen");
162 il->il_accept = accept_cb;
163
164 return (il);
165 }
166
167 void
icl_listen_free(struct icl_listen * il)168 icl_listen_free(struct icl_listen *il)
169 {
170 struct icl_listen_sock *ils;
171 sbintime_t sbt, pr;
172
173 sx_xlock(&il->il_lock);
174 while (!TAILQ_EMPTY(&il->il_sockets)) {
175 ils = TAILQ_FIRST(&il->il_sockets);
176 while (ils->ils_running) {
177 ICL_DEBUG("waiting for accept thread to terminate");
178 sx_xunlock(&il->il_lock);
179 SOLISTEN_LOCK(ils->ils_socket);
180 ils->ils_socket->so_error = ENOTCONN;
181 SOLISTEN_UNLOCK(ils->ils_socket);
182 wakeup(&ils->ils_socket->so_timeo);
183 sbt = mstosbt(995);
184 pr = mstosbt(10);
185 pause_sbt("icl_unlisten", sbt, pr, 0);
186 sx_xlock(&il->il_lock);
187 }
188
189 TAILQ_REMOVE(&il->il_sockets, ils, ils_next);
190 soclose(ils->ils_socket);
191 free(ils, M_ICL_PROXY);
192 }
193 sx_xunlock(&il->il_lock);
194
195 free(il, M_ICL_PROXY);
196 }
197
198 /*
199 * XXX: Doing accept in a separate thread in each socket might not be the
200 * best way to do stuff, but it's pretty clean and debuggable - and you
201 * probably won't have hundreds of listening sockets anyway.
202 */
203 static void
icl_accept_thread(void * arg)204 icl_accept_thread(void *arg)
205 {
206 struct icl_listen_sock *ils;
207 struct socket *head, *so;
208 struct sockaddr_storage ss = { .ss_len = sizeof(ss) };
209 int error;
210
211 ils = arg;
212 head = ils->ils_socket;
213
214 ils->ils_running = true;
215
216 for (;;) {
217 SOLISTEN_LOCK(head);
218 error = solisten_dequeue(head, &so, 0);
219 if (error == ENOTCONN) {
220 /*
221 * XXXGL: ENOTCONN is our mark from icl_listen_free().
222 * Neither socket code, nor msleep(9) may return it.
223 */
224 ICL_DEBUG("terminating");
225 ils->ils_running = false;
226 kthread_exit();
227 return;
228 }
229 if (error) {
230 ICL_WARN("solisten_dequeue error %d", error);
231 continue;
232 }
233
234 error = soaccept(so, (struct sockaddr *)&ss);
235 if (error != 0) {
236 ICL_WARN("soaccept error %d", error);
237 soclose(so);
238 continue;
239 }
240
241 (ils->ils_listen->il_accept)(so, (struct sockaddr *)&ss,
242 ils->ils_id);
243 }
244 }
245
246 static int
icl_listen_add_tcp(struct icl_listen * il,int domain,int socktype,int protocol,struct sockaddr * sa,int portal_id)247 icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype,
248 int protocol, struct sockaddr *sa, int portal_id)
249 {
250 struct icl_listen_sock *ils;
251 struct socket *so;
252 struct sockopt sopt;
253 int error, one = 1;
254
255 error = socreate(domain, &so, socktype, protocol,
256 curthread->td_ucred, curthread);
257 if (error != 0) {
258 ICL_WARN("socreate failed with error %d", error);
259 return (error);
260 }
261
262 sopt.sopt_dir = SOPT_SET;
263 sopt.sopt_level = SOL_SOCKET;
264 sopt.sopt_name = SO_REUSEADDR;
265 sopt.sopt_val = &one;
266 sopt.sopt_valsize = sizeof(one);
267 sopt.sopt_td = NULL;
268 error = sosetopt(so, &sopt);
269 if (error != 0) {
270 ICL_WARN("failed to set SO_REUSEADDR with error %d", error);
271 soclose(so);
272 return (error);
273 }
274
275 error = sobind(so, sa, curthread);
276 if (error != 0) {
277 ICL_WARN("sobind failed with error %d", error);
278 soclose(so);
279 return (error);
280 }
281
282 error = solisten(so, -1, curthread);
283 if (error != 0) {
284 ICL_WARN("solisten failed with error %d", error);
285 soclose(so);
286 return (error);
287 }
288
289 ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK);
290 ils->ils_listen = il;
291 ils->ils_socket = so;
292 ils->ils_id = portal_id;
293
294 error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc");
295 if (error != 0) {
296 ICL_WARN("kthread_add failed with error %d", error);
297 soclose(so);
298 free(ils, M_ICL_PROXY);
299
300 return (error);
301 }
302
303 sx_xlock(&il->il_lock);
304 TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next);
305 sx_xunlock(&il->il_lock);
306
307 return (0);
308 }
309
310 int
icl_listen_add(struct icl_listen * il,bool rdma,int domain,int socktype,int protocol,struct sockaddr * sa,int portal_id)311 icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype,
312 int protocol, struct sockaddr *sa, int portal_id)
313 {
314
315 if (rdma) {
316 ICL_DEBUG("RDMA not supported");
317 return (EOPNOTSUPP);
318 }
319
320 return (icl_listen_add_tcp(il, domain, socktype, protocol, sa,
321 portal_id));
322 }
323
324 int
icl_listen_remove(struct icl_listen * il,struct sockaddr * sa)325 icl_listen_remove(struct icl_listen *il, struct sockaddr *sa)
326 {
327
328 /*
329 * XXX
330 */
331
332 return (EOPNOTSUPP);
333 }
334
335 #endif /* ICL_KERNEL_PROXY */
336