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/cdefs.h> 68 #include <sys/param.h> 69 #include <sys/capsicum.h> 70 #include <sys/condvar.h> 71 #include <sys/conf.h> 72 #include <sys/lock.h> 73 #include <sys/kernel.h> 74 #include <sys/kthread.h> 75 #include <sys/malloc.h> 76 #include <sys/mutex.h> 77 #include <sys/proc.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/sx.h> 81 #include <sys/systm.h> 82 #include <netinet/in.h> 83 #include <netinet/tcp.h> 84 85 #include <dev/iscsi/icl.h> 86 87 struct icl_listen_sock { 88 TAILQ_ENTRY(icl_listen_sock) ils_next; 89 struct icl_listen *ils_listen; 90 struct socket *ils_socket; 91 bool ils_running; 92 int ils_id; 93 }; 94 95 struct icl_listen { 96 TAILQ_HEAD(, icl_listen_sock) il_sockets; 97 struct sx il_lock; 98 void (*il_accept)(struct socket *, 99 struct sockaddr *, int); 100 }; 101 102 static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy"); 103 104 int 105 icl_soft_proxy_connect(struct icl_conn *ic, int domain, int socktype, 106 int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa) 107 { 108 struct socket *so; 109 int error; 110 111 error = socreate(domain, &so, socktype, protocol, 112 curthread->td_ucred, curthread); 113 if (error != 0) 114 return (error); 115 116 if (from_sa != NULL) { 117 error = sobind(so, from_sa, curthread); 118 if (error != 0) { 119 soclose(so); 120 return (error); 121 } 122 } 123 124 error = soconnect(so, to_sa, curthread); 125 if (error != 0) { 126 soclose(so); 127 return (error); 128 } 129 130 SOCK_LOCK(so); 131 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 132 error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH, 133 "icl_connect", 0); 134 if (error) 135 break; 136 } 137 if (error == 0) { 138 error = so->so_error; 139 so->so_error = 0; 140 } 141 SOCK_UNLOCK(so); 142 143 if (error != 0) { 144 soclose(so); 145 return (error); 146 } 147 148 error = icl_soft_handoff_sock(ic, so); 149 if (error != 0) 150 soclose(so); 151 152 return (error); 153 } 154 155 struct icl_listen * 156 icl_listen_new(void (*accept_cb)(struct socket *, struct sockaddr *, int)) 157 { 158 struct icl_listen *il; 159 160 il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK); 161 TAILQ_INIT(&il->il_sockets); 162 sx_init(&il->il_lock, "icl_listen"); 163 il->il_accept = accept_cb; 164 165 return (il); 166 } 167 168 void 169 icl_listen_free(struct icl_listen *il) 170 { 171 struct icl_listen_sock *ils; 172 sbintime_t sbt, pr; 173 174 sx_xlock(&il->il_lock); 175 while (!TAILQ_EMPTY(&il->il_sockets)) { 176 ils = TAILQ_FIRST(&il->il_sockets); 177 while (ils->ils_running) { 178 ICL_DEBUG("waiting for accept thread to terminate"); 179 sx_xunlock(&il->il_lock); 180 SOLISTEN_LOCK(ils->ils_socket); 181 ils->ils_socket->so_error = ENOTCONN; 182 SOLISTEN_UNLOCK(ils->ils_socket); 183 wakeup(&ils->ils_socket->so_timeo); 184 sbt = mstosbt(995); 185 pr = mstosbt(10); 186 pause_sbt("icl_unlisten", sbt, pr, 0); 187 sx_xlock(&il->il_lock); 188 } 189 190 TAILQ_REMOVE(&il->il_sockets, ils, ils_next); 191 soclose(ils->ils_socket); 192 free(ils, M_ICL_PROXY); 193 } 194 sx_xunlock(&il->il_lock); 195 196 free(il, M_ICL_PROXY); 197 } 198 199 /* 200 * XXX: Doing accept in a separate thread in each socket might not be the 201 * best way to do stuff, but it's pretty clean and debuggable - and you 202 * probably won't have hundreds of listening sockets anyway. 203 */ 204 static void 205 icl_accept_thread(void *arg) 206 { 207 struct icl_listen_sock *ils; 208 struct socket *head, *so; 209 struct sockaddr *sa; 210 int error; 211 212 ils = arg; 213 head = ils->ils_socket; 214 215 ils->ils_running = true; 216 217 for (;;) { 218 SOLISTEN_LOCK(head); 219 error = solisten_dequeue(head, &so, 0); 220 if (error == ENOTCONN) { 221 /* 222 * XXXGL: ENOTCONN is our mark from icl_listen_free(). 223 * Neither socket code, nor msleep(9) may return it. 224 */ 225 ICL_DEBUG("terminating"); 226 ils->ils_running = false; 227 kthread_exit(); 228 return; 229 } 230 if (error) { 231 ICL_WARN("solisten_dequeue error %d", error); 232 continue; 233 } 234 235 sa = NULL; 236 error = soaccept(so, &sa); 237 if (error != 0) { 238 ICL_WARN("soaccept error %d", error); 239 if (sa != NULL) 240 free(sa, M_SONAME); 241 soclose(so); 242 continue; 243 } 244 245 (ils->ils_listen->il_accept)(so, sa, ils->ils_id); 246 } 247 } 248 249 static int 250 icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype, 251 int protocol, struct sockaddr *sa, int portal_id) 252 { 253 struct icl_listen_sock *ils; 254 struct socket *so; 255 struct sockopt sopt; 256 int error, one = 1; 257 258 error = socreate(domain, &so, socktype, protocol, 259 curthread->td_ucred, curthread); 260 if (error != 0) { 261 ICL_WARN("socreate failed with error %d", error); 262 return (error); 263 } 264 265 sopt.sopt_dir = SOPT_SET; 266 sopt.sopt_level = SOL_SOCKET; 267 sopt.sopt_name = SO_REUSEADDR; 268 sopt.sopt_val = &one; 269 sopt.sopt_valsize = sizeof(one); 270 sopt.sopt_td = NULL; 271 error = sosetopt(so, &sopt); 272 if (error != 0) { 273 ICL_WARN("failed to set SO_REUSEADDR with error %d", error); 274 soclose(so); 275 return (error); 276 } 277 278 error = sobind(so, sa, curthread); 279 if (error != 0) { 280 ICL_WARN("sobind failed with error %d", error); 281 soclose(so); 282 return (error); 283 } 284 285 error = solisten(so, -1, curthread); 286 if (error != 0) { 287 ICL_WARN("solisten failed with error %d", error); 288 soclose(so); 289 return (error); 290 } 291 292 ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK); 293 ils->ils_listen = il; 294 ils->ils_socket = so; 295 ils->ils_id = portal_id; 296 297 error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc"); 298 if (error != 0) { 299 ICL_WARN("kthread_add failed with error %d", error); 300 soclose(so); 301 free(ils, M_ICL_PROXY); 302 303 return (error); 304 } 305 306 sx_xlock(&il->il_lock); 307 TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next); 308 sx_xunlock(&il->il_lock); 309 310 return (0); 311 } 312 313 int 314 icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype, 315 int protocol, struct sockaddr *sa, int portal_id) 316 { 317 318 if (rdma) { 319 ICL_DEBUG("RDMA not supported"); 320 return (EOPNOTSUPP); 321 } 322 323 return (icl_listen_add_tcp(il, domain, socktype, protocol, sa, 324 portal_id)); 325 } 326 327 int 328 icl_listen_remove(struct icl_listen *il, struct sockaddr *sa) 329 { 330 331 /* 332 * XXX 333 */ 334 335 return (EOPNOTSUPP); 336 } 337 338 #endif /* ICL_KERNEL_PROXY */ 339