1 /* 2 * Copyright (c) 2006 Oracle. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 */ 33 #include <linux/module.h> 34 #include <linux/errno.h> 35 #include <linux/kernel.h> 36 #include <linux/in.h> 37 #include <linux/poll.h> 38 #include <net/sock.h> 39 40 #include "rds.h" 41 #include "rdma.h" 42 43 /* this is just used for stats gathering :/ */ 44 static DEFINE_SPINLOCK(rds_sock_lock); 45 static unsigned long rds_sock_count; 46 static LIST_HEAD(rds_sock_list); 47 DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq); 48 49 /* 50 * This is called as the final descriptor referencing this socket is closed. 51 * We have to unbind the socket so that another socket can be bound to the 52 * address it was using. 53 * 54 * We have to be careful about racing with the incoming path. sock_orphan() 55 * sets SOCK_DEAD and we use that as an indicator to the rx path that new 56 * messages shouldn't be queued. 57 */ 58 static int rds_release(struct socket *sock) 59 { 60 struct sock *sk = sock->sk; 61 struct rds_sock *rs; 62 unsigned long flags; 63 64 if (sk == NULL) 65 goto out; 66 67 rs = rds_sk_to_rs(sk); 68 69 sock_orphan(sk); 70 /* Note - rds_clear_recv_queue grabs rs_recv_lock, so 71 * that ensures the recv path has completed messing 72 * with the socket. */ 73 rds_clear_recv_queue(rs); 74 rds_cong_remove_socket(rs); 75 rds_remove_bound(rs); 76 rds_send_drop_to(rs, NULL); 77 rds_rdma_drop_keys(rs); 78 rds_notify_queue_get(rs, NULL); 79 80 spin_lock_irqsave(&rds_sock_lock, flags); 81 list_del_init(&rs->rs_item); 82 rds_sock_count--; 83 spin_unlock_irqrestore(&rds_sock_lock, flags); 84 85 sock->sk = NULL; 86 sock_put(sk); 87 out: 88 return 0; 89 } 90 91 /* 92 * Careful not to race with rds_release -> sock_orphan which clears sk_sleep. 93 * _bh() isn't OK here, we're called from interrupt handlers. It's probably OK 94 * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but 95 * this seems more conservative. 96 * NB - normally, one would use sk_callback_lock for this, but we can 97 * get here from interrupts, whereas the network code grabs sk_callback_lock 98 * with _lock_bh only - so relying on sk_callback_lock introduces livelocks. 99 */ 100 void rds_wake_sk_sleep(struct rds_sock *rs) 101 { 102 unsigned long flags; 103 104 read_lock_irqsave(&rs->rs_recv_lock, flags); 105 __rds_wake_sk_sleep(rds_rs_to_sk(rs)); 106 read_unlock_irqrestore(&rs->rs_recv_lock, flags); 107 } 108 109 static int rds_getname(struct socket *sock, struct sockaddr *uaddr, 110 int *uaddr_len, int peer) 111 { 112 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 113 struct rds_sock *rs = rds_sk_to_rs(sock->sk); 114 115 memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); 116 117 /* racey, don't care */ 118 if (peer) { 119 if (!rs->rs_conn_addr) 120 return -ENOTCONN; 121 122 sin->sin_port = rs->rs_conn_port; 123 sin->sin_addr.s_addr = rs->rs_conn_addr; 124 } else { 125 sin->sin_port = rs->rs_bound_port; 126 sin->sin_addr.s_addr = rs->rs_bound_addr; 127 } 128 129 sin->sin_family = AF_INET; 130 131 *uaddr_len = sizeof(*sin); 132 return 0; 133 } 134 135 /* 136 * RDS' poll is without a doubt the least intuitive part of the interface, 137 * as POLLIN and POLLOUT do not behave entirely as you would expect from 138 * a network protocol. 139 * 140 * POLLIN is asserted if 141 * - there is data on the receive queue. 142 * - to signal that a previously congested destination may have become 143 * uncongested 144 * - A notification has been queued to the socket (this can be a congestion 145 * update, or a RDMA completion). 146 * 147 * POLLOUT is asserted if there is room on the send queue. This does not mean 148 * however, that the next sendmsg() call will succeed. If the application tries 149 * to send to a congested destination, the system call may still fail (and 150 * return ENOBUFS). 151 */ 152 static unsigned int rds_poll(struct file *file, struct socket *sock, 153 poll_table *wait) 154 { 155 struct sock *sk = sock->sk; 156 struct rds_sock *rs = rds_sk_to_rs(sk); 157 unsigned int mask = 0; 158 unsigned long flags; 159 160 poll_wait(file, sk->sk_sleep, wait); 161 162 poll_wait(file, &rds_poll_waitq, wait); 163 164 read_lock_irqsave(&rs->rs_recv_lock, flags); 165 if (!rs->rs_cong_monitor) { 166 /* When a congestion map was updated, we signal POLLIN for 167 * "historical" reasons. Applications can also poll for 168 * WRBAND instead. */ 169 if (rds_cong_updated_since(&rs->rs_cong_track)) 170 mask |= (POLLIN | POLLRDNORM | POLLWRBAND); 171 } else { 172 spin_lock(&rs->rs_lock); 173 if (rs->rs_cong_notify) 174 mask |= (POLLIN | POLLRDNORM); 175 spin_unlock(&rs->rs_lock); 176 } 177 if (!list_empty(&rs->rs_recv_queue) || 178 !list_empty(&rs->rs_notify_queue)) 179 mask |= (POLLIN | POLLRDNORM); 180 if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) 181 mask |= (POLLOUT | POLLWRNORM); 182 read_unlock_irqrestore(&rs->rs_recv_lock, flags); 183 184 return mask; 185 } 186 187 static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 188 { 189 return -ENOIOCTLCMD; 190 } 191 192 static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval, 193 int len) 194 { 195 struct sockaddr_in sin; 196 int ret = 0; 197 198 /* racing with another thread binding seems ok here */ 199 if (rs->rs_bound_addr == 0) { 200 ret = -ENOTCONN; /* XXX not a great errno */ 201 goto out; 202 } 203 204 if (len < sizeof(struct sockaddr_in)) { 205 ret = -EINVAL; 206 goto out; 207 } 208 209 if (copy_from_user(&sin, optval, sizeof(sin))) { 210 ret = -EFAULT; 211 goto out; 212 } 213 214 rds_send_drop_to(rs, &sin); 215 out: 216 return ret; 217 } 218 219 static int rds_set_bool_option(unsigned char *optvar, char __user *optval, 220 int optlen) 221 { 222 int value; 223 224 if (optlen < sizeof(int)) 225 return -EINVAL; 226 if (get_user(value, (int __user *) optval)) 227 return -EFAULT; 228 *optvar = !!value; 229 return 0; 230 } 231 232 static int rds_cong_monitor(struct rds_sock *rs, char __user *optval, 233 int optlen) 234 { 235 int ret; 236 237 ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen); 238 if (ret == 0) { 239 if (rs->rs_cong_monitor) { 240 rds_cong_add_socket(rs); 241 } else { 242 rds_cong_remove_socket(rs); 243 rs->rs_cong_mask = 0; 244 rs->rs_cong_notify = 0; 245 } 246 } 247 return ret; 248 } 249 250 static int rds_setsockopt(struct socket *sock, int level, int optname, 251 char __user *optval, unsigned int optlen) 252 { 253 struct rds_sock *rs = rds_sk_to_rs(sock->sk); 254 int ret; 255 256 if (level != SOL_RDS) { 257 ret = -ENOPROTOOPT; 258 goto out; 259 } 260 261 switch (optname) { 262 case RDS_CANCEL_SENT_TO: 263 ret = rds_cancel_sent_to(rs, optval, optlen); 264 break; 265 case RDS_GET_MR: 266 ret = rds_get_mr(rs, optval, optlen); 267 break; 268 case RDS_GET_MR_FOR_DEST: 269 ret = rds_get_mr_for_dest(rs, optval, optlen); 270 break; 271 case RDS_FREE_MR: 272 ret = rds_free_mr(rs, optval, optlen); 273 break; 274 case RDS_RECVERR: 275 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen); 276 break; 277 case RDS_CONG_MONITOR: 278 ret = rds_cong_monitor(rs, optval, optlen); 279 break; 280 default: 281 ret = -ENOPROTOOPT; 282 } 283 out: 284 return ret; 285 } 286 287 static int rds_getsockopt(struct socket *sock, int level, int optname, 288 char __user *optval, int __user *optlen) 289 { 290 struct rds_sock *rs = rds_sk_to_rs(sock->sk); 291 int ret = -ENOPROTOOPT, len; 292 293 if (level != SOL_RDS) 294 goto out; 295 296 if (get_user(len, optlen)) { 297 ret = -EFAULT; 298 goto out; 299 } 300 301 switch (optname) { 302 case RDS_INFO_FIRST ... RDS_INFO_LAST: 303 ret = rds_info_getsockopt(sock, optname, optval, 304 optlen); 305 break; 306 307 case RDS_RECVERR: 308 if (len < sizeof(int)) 309 ret = -EINVAL; 310 else 311 if (put_user(rs->rs_recverr, (int __user *) optval) || 312 put_user(sizeof(int), optlen)) 313 ret = -EFAULT; 314 else 315 ret = 0; 316 break; 317 default: 318 break; 319 } 320 321 out: 322 return ret; 323 324 } 325 326 static int rds_connect(struct socket *sock, struct sockaddr *uaddr, 327 int addr_len, int flags) 328 { 329 struct sock *sk = sock->sk; 330 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; 331 struct rds_sock *rs = rds_sk_to_rs(sk); 332 int ret = 0; 333 334 lock_sock(sk); 335 336 if (addr_len != sizeof(struct sockaddr_in)) { 337 ret = -EINVAL; 338 goto out; 339 } 340 341 if (sin->sin_family != AF_INET) { 342 ret = -EAFNOSUPPORT; 343 goto out; 344 } 345 346 if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) { 347 ret = -EDESTADDRREQ; 348 goto out; 349 } 350 351 rs->rs_conn_addr = sin->sin_addr.s_addr; 352 rs->rs_conn_port = sin->sin_port; 353 354 out: 355 release_sock(sk); 356 return ret; 357 } 358 359 static struct proto rds_proto = { 360 .name = "RDS", 361 .owner = THIS_MODULE, 362 .obj_size = sizeof(struct rds_sock), 363 }; 364 365 static const struct proto_ops rds_proto_ops = { 366 .family = AF_RDS, 367 .owner = THIS_MODULE, 368 .release = rds_release, 369 .bind = rds_bind, 370 .connect = rds_connect, 371 .socketpair = sock_no_socketpair, 372 .accept = sock_no_accept, 373 .getname = rds_getname, 374 .poll = rds_poll, 375 .ioctl = rds_ioctl, 376 .listen = sock_no_listen, 377 .shutdown = sock_no_shutdown, 378 .setsockopt = rds_setsockopt, 379 .getsockopt = rds_getsockopt, 380 .sendmsg = rds_sendmsg, 381 .recvmsg = rds_recvmsg, 382 .mmap = sock_no_mmap, 383 .sendpage = sock_no_sendpage, 384 }; 385 386 static int __rds_create(struct socket *sock, struct sock *sk, int protocol) 387 { 388 unsigned long flags; 389 struct rds_sock *rs; 390 391 sock_init_data(sock, sk); 392 sock->ops = &rds_proto_ops; 393 sk->sk_protocol = protocol; 394 395 rs = rds_sk_to_rs(sk); 396 spin_lock_init(&rs->rs_lock); 397 rwlock_init(&rs->rs_recv_lock); 398 INIT_LIST_HEAD(&rs->rs_send_queue); 399 INIT_LIST_HEAD(&rs->rs_recv_queue); 400 INIT_LIST_HEAD(&rs->rs_notify_queue); 401 INIT_LIST_HEAD(&rs->rs_cong_list); 402 spin_lock_init(&rs->rs_rdma_lock); 403 rs->rs_rdma_keys = RB_ROOT; 404 405 spin_lock_irqsave(&rds_sock_lock, flags); 406 list_add_tail(&rs->rs_item, &rds_sock_list); 407 rds_sock_count++; 408 spin_unlock_irqrestore(&rds_sock_lock, flags); 409 410 return 0; 411 } 412 413 static int rds_create(struct net *net, struct socket *sock, int protocol, 414 int kern) 415 { 416 struct sock *sk; 417 418 if (sock->type != SOCK_SEQPACKET || protocol) 419 return -ESOCKTNOSUPPORT; 420 421 sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto); 422 if (!sk) 423 return -ENOMEM; 424 425 return __rds_create(sock, sk, protocol); 426 } 427 428 void rds_sock_addref(struct rds_sock *rs) 429 { 430 sock_hold(rds_rs_to_sk(rs)); 431 } 432 433 void rds_sock_put(struct rds_sock *rs) 434 { 435 sock_put(rds_rs_to_sk(rs)); 436 } 437 438 static const struct net_proto_family rds_family_ops = { 439 .family = AF_RDS, 440 .create = rds_create, 441 .owner = THIS_MODULE, 442 }; 443 444 static void rds_sock_inc_info(struct socket *sock, unsigned int len, 445 struct rds_info_iterator *iter, 446 struct rds_info_lengths *lens) 447 { 448 struct rds_sock *rs; 449 struct sock *sk; 450 struct rds_incoming *inc; 451 unsigned long flags; 452 unsigned int total = 0; 453 454 len /= sizeof(struct rds_info_message); 455 456 spin_lock_irqsave(&rds_sock_lock, flags); 457 458 list_for_each_entry(rs, &rds_sock_list, rs_item) { 459 sk = rds_rs_to_sk(rs); 460 read_lock(&rs->rs_recv_lock); 461 462 /* XXX too lazy to maintain counts.. */ 463 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) { 464 total++; 465 if (total <= len) 466 rds_inc_info_copy(inc, iter, inc->i_saddr, 467 rs->rs_bound_addr, 1); 468 } 469 470 read_unlock(&rs->rs_recv_lock); 471 } 472 473 spin_unlock_irqrestore(&rds_sock_lock, flags); 474 475 lens->nr = total; 476 lens->each = sizeof(struct rds_info_message); 477 } 478 479 static void rds_sock_info(struct socket *sock, unsigned int len, 480 struct rds_info_iterator *iter, 481 struct rds_info_lengths *lens) 482 { 483 struct rds_info_socket sinfo; 484 struct rds_sock *rs; 485 unsigned long flags; 486 487 len /= sizeof(struct rds_info_socket); 488 489 spin_lock_irqsave(&rds_sock_lock, flags); 490 491 if (len < rds_sock_count) 492 goto out; 493 494 list_for_each_entry(rs, &rds_sock_list, rs_item) { 495 sinfo.sndbuf = rds_sk_sndbuf(rs); 496 sinfo.rcvbuf = rds_sk_rcvbuf(rs); 497 sinfo.bound_addr = rs->rs_bound_addr; 498 sinfo.connected_addr = rs->rs_conn_addr; 499 sinfo.bound_port = rs->rs_bound_port; 500 sinfo.connected_port = rs->rs_conn_port; 501 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs)); 502 503 rds_info_copy(iter, &sinfo, sizeof(sinfo)); 504 } 505 506 out: 507 lens->nr = rds_sock_count; 508 lens->each = sizeof(struct rds_info_socket); 509 510 spin_unlock_irqrestore(&rds_sock_lock, flags); 511 } 512 513 static void __exit rds_exit(void) 514 { 515 sock_unregister(rds_family_ops.family); 516 proto_unregister(&rds_proto); 517 rds_conn_exit(); 518 rds_cong_exit(); 519 rds_sysctl_exit(); 520 rds_threads_exit(); 521 rds_stats_exit(); 522 rds_page_exit(); 523 rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info); 524 rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info); 525 } 526 module_exit(rds_exit); 527 528 static int __init rds_init(void) 529 { 530 int ret; 531 532 ret = rds_conn_init(); 533 if (ret) 534 goto out; 535 ret = rds_threads_init(); 536 if (ret) 537 goto out_conn; 538 ret = rds_sysctl_init(); 539 if (ret) 540 goto out_threads; 541 ret = rds_stats_init(); 542 if (ret) 543 goto out_sysctl; 544 ret = proto_register(&rds_proto, 1); 545 if (ret) 546 goto out_stats; 547 ret = sock_register(&rds_family_ops); 548 if (ret) 549 goto out_proto; 550 551 rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info); 552 rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info); 553 554 goto out; 555 556 out_proto: 557 proto_unregister(&rds_proto); 558 out_stats: 559 rds_stats_exit(); 560 out_sysctl: 561 rds_sysctl_exit(); 562 out_threads: 563 rds_threads_exit(); 564 out_conn: 565 rds_conn_exit(); 566 rds_cong_exit(); 567 rds_page_exit(); 568 out: 569 return ret; 570 } 571 module_init(rds_init); 572 573 #define DRV_VERSION "4.0" 574 #define DRV_RELDATE "Feb 12, 2009" 575 576 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); 577 MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets" 578 " v" DRV_VERSION " (" DRV_RELDATE ")"); 579 MODULE_VERSION(DRV_VERSION); 580 MODULE_LICENSE("Dual BSD/GPL"); 581 MODULE_ALIAS_NETPROTO(PF_RDS); 582