1 /* 2 * linux/net/sunrpc/xprtsock.c 3 * 4 * Client-side transport implementation for sockets. 5 * 6 * TCP callback races fixes (C) 1998 Red Hat 7 * TCP send fixes (C) 1998 Red Hat 8 * TCP NFS related read + write fixes 9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 10 * 11 * Rewrite of larges part of the code in order to stabilize TCP stuff. 12 * Fix behaviour when socket buffer is full. 13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 14 * 15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 16 * 17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 18 * <gilles.quillard@bull.net> 19 */ 20 21 #include <linux/types.h> 22 #include <linux/slab.h> 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/pagemap.h> 26 #include <linux/errno.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/net.h> 30 #include <linux/mm.h> 31 #include <linux/udp.h> 32 #include <linux/tcp.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/sched.h> 35 #include <linux/sunrpc/svcsock.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/file.h> 38 #ifdef CONFIG_NFS_V4_1 39 #include <linux/sunrpc/bc_xprt.h> 40 #endif 41 42 #include <net/sock.h> 43 #include <net/checksum.h> 44 #include <net/udp.h> 45 #include <net/tcp.h> 46 47 #include "sunrpc.h" 48 /* 49 * xprtsock tunables 50 */ 51 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 52 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; 53 54 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 55 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 56 57 #define XS_TCP_LINGER_TO (15U * HZ) 58 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 59 60 /* 61 * We can register our own files under /proc/sys/sunrpc by 62 * calling register_sysctl_table() again. The files in that 63 * directory become the union of all files registered there. 64 * 65 * We simply need to make sure that we don't collide with 66 * someone else's file names! 67 */ 68 69 #ifdef RPC_DEBUG 70 71 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 72 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 73 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 74 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 75 76 static struct ctl_table_header *sunrpc_table_header; 77 78 /* 79 * FIXME: changing the UDP slot table size should also resize the UDP 80 * socket buffers for existing UDP transports 81 */ 82 static ctl_table xs_tunables_table[] = { 83 { 84 .procname = "udp_slot_table_entries", 85 .data = &xprt_udp_slot_table_entries, 86 .maxlen = sizeof(unsigned int), 87 .mode = 0644, 88 .proc_handler = proc_dointvec_minmax, 89 .extra1 = &min_slot_table_size, 90 .extra2 = &max_slot_table_size 91 }, 92 { 93 .procname = "tcp_slot_table_entries", 94 .data = &xprt_tcp_slot_table_entries, 95 .maxlen = sizeof(unsigned int), 96 .mode = 0644, 97 .proc_handler = proc_dointvec_minmax, 98 .extra1 = &min_slot_table_size, 99 .extra2 = &max_slot_table_size 100 }, 101 { 102 .procname = "min_resvport", 103 .data = &xprt_min_resvport, 104 .maxlen = sizeof(unsigned int), 105 .mode = 0644, 106 .proc_handler = proc_dointvec_minmax, 107 .extra1 = &xprt_min_resvport_limit, 108 .extra2 = &xprt_max_resvport_limit 109 }, 110 { 111 .procname = "max_resvport", 112 .data = &xprt_max_resvport, 113 .maxlen = sizeof(unsigned int), 114 .mode = 0644, 115 .proc_handler = proc_dointvec_minmax, 116 .extra1 = &xprt_min_resvport_limit, 117 .extra2 = &xprt_max_resvport_limit 118 }, 119 { 120 .procname = "tcp_fin_timeout", 121 .data = &xs_tcp_fin_timeout, 122 .maxlen = sizeof(xs_tcp_fin_timeout), 123 .mode = 0644, 124 .proc_handler = proc_dointvec_jiffies, 125 }, 126 { }, 127 }; 128 129 static ctl_table sunrpc_table[] = { 130 { 131 .procname = "sunrpc", 132 .mode = 0555, 133 .child = xs_tunables_table 134 }, 135 { }, 136 }; 137 138 #endif 139 140 /* 141 * Wait duration for a reply from the RPC portmapper. 142 */ 143 #define XS_BIND_TO (60U * HZ) 144 145 /* 146 * Delay if a UDP socket connect error occurs. This is most likely some 147 * kind of resource problem on the local host. 148 */ 149 #define XS_UDP_REEST_TO (2U * HZ) 150 151 /* 152 * The reestablish timeout allows clients to delay for a bit before attempting 153 * to reconnect to a server that just dropped our connection. 154 * 155 * We implement an exponential backoff when trying to reestablish a TCP 156 * transport connection with the server. Some servers like to drop a TCP 157 * connection when they are overworked, so we start with a short timeout and 158 * increase over time if the server is down or not responding. 159 */ 160 #define XS_TCP_INIT_REEST_TO (3U * HZ) 161 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 162 163 /* 164 * TCP idle timeout; client drops the transport socket if it is idle 165 * for this long. Note that we also timeout UDP sockets to prevent 166 * holding port numbers when there is no RPC traffic. 167 */ 168 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 169 170 #ifdef RPC_DEBUG 171 # undef RPC_DEBUG_DATA 172 # define RPCDBG_FACILITY RPCDBG_TRANS 173 #endif 174 175 #ifdef RPC_DEBUG_DATA 176 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 177 { 178 u8 *buf = (u8 *) packet; 179 int j; 180 181 dprintk("RPC: %s\n", msg); 182 for (j = 0; j < count && j < 128; j += 4) { 183 if (!(j & 31)) { 184 if (j) 185 dprintk("\n"); 186 dprintk("0x%04x ", j); 187 } 188 dprintk("%02x%02x%02x%02x ", 189 buf[j], buf[j+1], buf[j+2], buf[j+3]); 190 } 191 dprintk("\n"); 192 } 193 #else 194 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 195 { 196 /* NOP */ 197 } 198 #endif 199 200 struct sock_xprt { 201 struct rpc_xprt xprt; 202 203 /* 204 * Network layer 205 */ 206 struct socket * sock; 207 struct sock * inet; 208 209 /* 210 * State of TCP reply receive 211 */ 212 __be32 tcp_fraghdr, 213 tcp_xid, 214 tcp_calldir; 215 216 u32 tcp_offset, 217 tcp_reclen; 218 219 unsigned long tcp_copied, 220 tcp_flags; 221 222 /* 223 * Connection of transports 224 */ 225 struct delayed_work connect_worker; 226 struct sockaddr_storage srcaddr; 227 unsigned short srcport; 228 229 /* 230 * UDP socket buffer size parameters 231 */ 232 size_t rcvsize, 233 sndsize; 234 235 /* 236 * Saved socket callback addresses 237 */ 238 void (*old_data_ready)(struct sock *, int); 239 void (*old_state_change)(struct sock *); 240 void (*old_write_space)(struct sock *); 241 void (*old_error_report)(struct sock *); 242 }; 243 244 /* 245 * TCP receive state flags 246 */ 247 #define TCP_RCV_LAST_FRAG (1UL << 0) 248 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 249 #define TCP_RCV_COPY_XID (1UL << 2) 250 #define TCP_RCV_COPY_DATA (1UL << 3) 251 #define TCP_RCV_READ_CALLDIR (1UL << 4) 252 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 253 254 /* 255 * TCP RPC flags 256 */ 257 #define TCP_RPC_REPLY (1UL << 6) 258 259 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 260 { 261 return (struct sockaddr *) &xprt->addr; 262 } 263 264 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 265 { 266 return (struct sockaddr_in *) &xprt->addr; 267 } 268 269 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 270 { 271 return (struct sockaddr_in6 *) &xprt->addr; 272 } 273 274 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 275 { 276 struct sockaddr *sap = xs_addr(xprt); 277 struct sockaddr_in6 *sin6; 278 struct sockaddr_in *sin; 279 char buf[128]; 280 281 (void)rpc_ntop(sap, buf, sizeof(buf)); 282 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); 283 284 switch (sap->sa_family) { 285 case AF_INET: 286 sin = xs_addr_in(xprt); 287 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 288 break; 289 case AF_INET6: 290 sin6 = xs_addr_in6(xprt); 291 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 292 break; 293 default: 294 BUG(); 295 } 296 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 297 } 298 299 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 300 { 301 struct sockaddr *sap = xs_addr(xprt); 302 char buf[128]; 303 304 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 305 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 306 307 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 308 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 309 } 310 311 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 312 const char *protocol, 313 const char *netid) 314 { 315 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 316 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 317 xs_format_common_peer_addresses(xprt); 318 xs_format_common_peer_ports(xprt); 319 } 320 321 static void xs_update_peer_port(struct rpc_xprt *xprt) 322 { 323 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 324 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 325 326 xs_format_common_peer_ports(xprt); 327 } 328 329 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 330 { 331 unsigned int i; 332 333 for (i = 0; i < RPC_DISPLAY_MAX; i++) 334 switch (i) { 335 case RPC_DISPLAY_PROTO: 336 case RPC_DISPLAY_NETID: 337 continue; 338 default: 339 kfree(xprt->address_strings[i]); 340 } 341 } 342 343 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 344 345 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 346 { 347 struct msghdr msg = { 348 .msg_name = addr, 349 .msg_namelen = addrlen, 350 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 351 }; 352 struct kvec iov = { 353 .iov_base = vec->iov_base + base, 354 .iov_len = vec->iov_len - base, 355 }; 356 357 if (iov.iov_len != 0) 358 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 359 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 360 } 361 362 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 363 { 364 struct page **ppage; 365 unsigned int remainder; 366 int err, sent = 0; 367 368 remainder = xdr->page_len - base; 369 base += xdr->page_base; 370 ppage = xdr->pages + (base >> PAGE_SHIFT); 371 base &= ~PAGE_MASK; 372 for(;;) { 373 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 374 int flags = XS_SENDMSG_FLAGS; 375 376 remainder -= len; 377 if (remainder != 0 || more) 378 flags |= MSG_MORE; 379 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 380 if (remainder == 0 || err != len) 381 break; 382 sent += err; 383 ppage++; 384 base = 0; 385 } 386 if (sent == 0) 387 return err; 388 if (err > 0) 389 sent += err; 390 return sent; 391 } 392 393 /** 394 * xs_sendpages - write pages directly to a socket 395 * @sock: socket to send on 396 * @addr: UDP only -- address of destination 397 * @addrlen: UDP only -- length of destination address 398 * @xdr: buffer containing this request 399 * @base: starting position in the buffer 400 * 401 */ 402 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 403 { 404 unsigned int remainder = xdr->len - base; 405 int err, sent = 0; 406 407 if (unlikely(!sock)) 408 return -ENOTSOCK; 409 410 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 411 if (base != 0) { 412 addr = NULL; 413 addrlen = 0; 414 } 415 416 if (base < xdr->head[0].iov_len || addr != NULL) { 417 unsigned int len = xdr->head[0].iov_len - base; 418 remainder -= len; 419 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 420 if (remainder == 0 || err != len) 421 goto out; 422 sent += err; 423 base = 0; 424 } else 425 base -= xdr->head[0].iov_len; 426 427 if (base < xdr->page_len) { 428 unsigned int len = xdr->page_len - base; 429 remainder -= len; 430 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 431 if (remainder == 0 || err != len) 432 goto out; 433 sent += err; 434 base = 0; 435 } else 436 base -= xdr->page_len; 437 438 if (base >= xdr->tail[0].iov_len) 439 return sent; 440 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 441 out: 442 if (sent == 0) 443 return err; 444 if (err > 0) 445 sent += err; 446 return sent; 447 } 448 449 static void xs_nospace_callback(struct rpc_task *task) 450 { 451 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 452 453 transport->inet->sk_write_pending--; 454 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 455 } 456 457 /** 458 * xs_nospace - place task on wait queue if transmit was incomplete 459 * @task: task to put to sleep 460 * 461 */ 462 static int xs_nospace(struct rpc_task *task) 463 { 464 struct rpc_rqst *req = task->tk_rqstp; 465 struct rpc_xprt *xprt = req->rq_xprt; 466 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 467 int ret = 0; 468 469 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 470 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 471 req->rq_slen); 472 473 /* Protect against races with write_space */ 474 spin_lock_bh(&xprt->transport_lock); 475 476 /* Don't race with disconnect */ 477 if (xprt_connected(xprt)) { 478 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 479 ret = -EAGAIN; 480 /* 481 * Notify TCP that we're limited by the application 482 * window size 483 */ 484 set_bit(SOCK_NOSPACE, &transport->sock->flags); 485 transport->inet->sk_write_pending++; 486 /* ...and wait for more buffer space */ 487 xprt_wait_for_buffer_space(task, xs_nospace_callback); 488 } 489 } else { 490 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 491 ret = -ENOTCONN; 492 } 493 494 spin_unlock_bh(&xprt->transport_lock); 495 return ret; 496 } 497 498 /** 499 * xs_udp_send_request - write an RPC request to a UDP socket 500 * @task: address of RPC task that manages the state of an RPC request 501 * 502 * Return values: 503 * 0: The request has been sent 504 * EAGAIN: The socket was blocked, please call again later to 505 * complete the request 506 * ENOTCONN: Caller needs to invoke connect logic then call again 507 * other: Some other error occured, the request was not sent 508 */ 509 static int xs_udp_send_request(struct rpc_task *task) 510 { 511 struct rpc_rqst *req = task->tk_rqstp; 512 struct rpc_xprt *xprt = req->rq_xprt; 513 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 514 struct xdr_buf *xdr = &req->rq_snd_buf; 515 int status; 516 517 xs_pktdump("packet data:", 518 req->rq_svec->iov_base, 519 req->rq_svec->iov_len); 520 521 if (!xprt_bound(xprt)) 522 return -ENOTCONN; 523 status = xs_sendpages(transport->sock, 524 xs_addr(xprt), 525 xprt->addrlen, xdr, 526 req->rq_bytes_sent); 527 528 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 529 xdr->len - req->rq_bytes_sent, status); 530 531 if (status >= 0) { 532 req->rq_xmit_bytes_sent += status; 533 if (status >= req->rq_slen) 534 return 0; 535 /* Still some bytes left; set up for a retry later. */ 536 status = -EAGAIN; 537 } 538 539 switch (status) { 540 case -ENOTSOCK: 541 status = -ENOTCONN; 542 /* Should we call xs_close() here? */ 543 break; 544 case -EAGAIN: 545 status = xs_nospace(task); 546 break; 547 default: 548 dprintk("RPC: sendmsg returned unrecognized error %d\n", 549 -status); 550 case -ENETUNREACH: 551 case -EPIPE: 552 case -ECONNREFUSED: 553 /* When the server has died, an ICMP port unreachable message 554 * prompts ECONNREFUSED. */ 555 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 556 } 557 558 return status; 559 } 560 561 /** 562 * xs_tcp_shutdown - gracefully shut down a TCP socket 563 * @xprt: transport 564 * 565 * Initiates a graceful shutdown of the TCP socket by calling the 566 * equivalent of shutdown(SHUT_WR); 567 */ 568 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 569 { 570 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 571 struct socket *sock = transport->sock; 572 573 if (sock != NULL) 574 kernel_sock_shutdown(sock, SHUT_WR); 575 } 576 577 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 578 { 579 u32 reclen = buf->len - sizeof(rpc_fraghdr); 580 rpc_fraghdr *base = buf->head[0].iov_base; 581 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 582 } 583 584 /** 585 * xs_tcp_send_request - write an RPC request to a TCP socket 586 * @task: address of RPC task that manages the state of an RPC request 587 * 588 * Return values: 589 * 0: The request has been sent 590 * EAGAIN: The socket was blocked, please call again later to 591 * complete the request 592 * ENOTCONN: Caller needs to invoke connect logic then call again 593 * other: Some other error occured, the request was not sent 594 * 595 * XXX: In the case of soft timeouts, should we eventually give up 596 * if sendmsg is not able to make progress? 597 */ 598 static int xs_tcp_send_request(struct rpc_task *task) 599 { 600 struct rpc_rqst *req = task->tk_rqstp; 601 struct rpc_xprt *xprt = req->rq_xprt; 602 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 603 struct xdr_buf *xdr = &req->rq_snd_buf; 604 int status; 605 606 xs_encode_tcp_record_marker(&req->rq_snd_buf); 607 608 xs_pktdump("packet data:", 609 req->rq_svec->iov_base, 610 req->rq_svec->iov_len); 611 612 /* Continue transmitting the packet/record. We must be careful 613 * to cope with writespace callbacks arriving _after_ we have 614 * called sendmsg(). */ 615 while (1) { 616 status = xs_sendpages(transport->sock, 617 NULL, 0, xdr, req->rq_bytes_sent); 618 619 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 620 xdr->len - req->rq_bytes_sent, status); 621 622 if (unlikely(status < 0)) 623 break; 624 625 /* If we've sent the entire packet, immediately 626 * reset the count of bytes sent. */ 627 req->rq_bytes_sent += status; 628 req->rq_xmit_bytes_sent += status; 629 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 630 req->rq_bytes_sent = 0; 631 return 0; 632 } 633 634 if (status != 0) 635 continue; 636 status = -EAGAIN; 637 break; 638 } 639 640 switch (status) { 641 case -ENOTSOCK: 642 status = -ENOTCONN; 643 /* Should we call xs_close() here? */ 644 break; 645 case -EAGAIN: 646 status = xs_nospace(task); 647 break; 648 default: 649 dprintk("RPC: sendmsg returned unrecognized error %d\n", 650 -status); 651 case -ECONNRESET: 652 case -EPIPE: 653 xs_tcp_shutdown(xprt); 654 case -ECONNREFUSED: 655 case -ENOTCONN: 656 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 657 } 658 659 return status; 660 } 661 662 /** 663 * xs_tcp_release_xprt - clean up after a tcp transmission 664 * @xprt: transport 665 * @task: rpc task 666 * 667 * This cleans up if an error causes us to abort the transmission of a request. 668 * In this case, the socket may need to be reset in order to avoid confusing 669 * the server. 670 */ 671 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 672 { 673 struct rpc_rqst *req; 674 675 if (task != xprt->snd_task) 676 return; 677 if (task == NULL) 678 goto out_release; 679 req = task->tk_rqstp; 680 if (req->rq_bytes_sent == 0) 681 goto out_release; 682 if (req->rq_bytes_sent == req->rq_snd_buf.len) 683 goto out_release; 684 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 685 out_release: 686 xprt_release_xprt(xprt, task); 687 } 688 689 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 690 { 691 transport->old_data_ready = sk->sk_data_ready; 692 transport->old_state_change = sk->sk_state_change; 693 transport->old_write_space = sk->sk_write_space; 694 transport->old_error_report = sk->sk_error_report; 695 } 696 697 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 698 { 699 sk->sk_data_ready = transport->old_data_ready; 700 sk->sk_state_change = transport->old_state_change; 701 sk->sk_write_space = transport->old_write_space; 702 sk->sk_error_report = transport->old_error_report; 703 } 704 705 static void xs_reset_transport(struct sock_xprt *transport) 706 { 707 struct socket *sock = transport->sock; 708 struct sock *sk = transport->inet; 709 710 if (sk == NULL) 711 return; 712 713 write_lock_bh(&sk->sk_callback_lock); 714 transport->inet = NULL; 715 transport->sock = NULL; 716 717 sk->sk_user_data = NULL; 718 719 xs_restore_old_callbacks(transport, sk); 720 write_unlock_bh(&sk->sk_callback_lock); 721 722 sk->sk_no_check = 0; 723 724 sock_release(sock); 725 } 726 727 /** 728 * xs_close - close a socket 729 * @xprt: transport 730 * 731 * This is used when all requests are complete; ie, no DRC state remains 732 * on the server we want to save. 733 * 734 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 735 * xs_reset_transport() zeroing the socket from underneath a writer. 736 */ 737 static void xs_close(struct rpc_xprt *xprt) 738 { 739 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 740 741 dprintk("RPC: xs_close xprt %p\n", xprt); 742 743 xs_reset_transport(transport); 744 xprt->reestablish_timeout = 0; 745 746 smp_mb__before_clear_bit(); 747 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 748 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 749 clear_bit(XPRT_CLOSING, &xprt->state); 750 smp_mb__after_clear_bit(); 751 xprt_disconnect_done(xprt); 752 } 753 754 static void xs_tcp_close(struct rpc_xprt *xprt) 755 { 756 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 757 xs_close(xprt); 758 else 759 xs_tcp_shutdown(xprt); 760 } 761 762 /** 763 * xs_destroy - prepare to shutdown a transport 764 * @xprt: doomed transport 765 * 766 */ 767 static void xs_destroy(struct rpc_xprt *xprt) 768 { 769 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 770 771 dprintk("RPC: xs_destroy xprt %p\n", xprt); 772 773 cancel_rearming_delayed_work(&transport->connect_worker); 774 775 xs_close(xprt); 776 xs_free_peer_addresses(xprt); 777 kfree(xprt->slot); 778 kfree(xprt); 779 module_put(THIS_MODULE); 780 } 781 782 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 783 { 784 return (struct rpc_xprt *) sk->sk_user_data; 785 } 786 787 /** 788 * xs_udp_data_ready - "data ready" callback for UDP sockets 789 * @sk: socket with data to read 790 * @len: how much data to read 791 * 792 */ 793 static void xs_udp_data_ready(struct sock *sk, int len) 794 { 795 struct rpc_task *task; 796 struct rpc_xprt *xprt; 797 struct rpc_rqst *rovr; 798 struct sk_buff *skb; 799 int err, repsize, copied; 800 u32 _xid; 801 __be32 *xp; 802 803 read_lock(&sk->sk_callback_lock); 804 dprintk("RPC: xs_udp_data_ready...\n"); 805 if (!(xprt = xprt_from_sock(sk))) 806 goto out; 807 808 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 809 goto out; 810 811 if (xprt->shutdown) 812 goto dropit; 813 814 repsize = skb->len - sizeof(struct udphdr); 815 if (repsize < 4) { 816 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 817 goto dropit; 818 } 819 820 /* Copy the XID from the skb... */ 821 xp = skb_header_pointer(skb, sizeof(struct udphdr), 822 sizeof(_xid), &_xid); 823 if (xp == NULL) 824 goto dropit; 825 826 /* Look up and lock the request corresponding to the given XID */ 827 spin_lock(&xprt->transport_lock); 828 rovr = xprt_lookup_rqst(xprt, *xp); 829 if (!rovr) 830 goto out_unlock; 831 task = rovr->rq_task; 832 833 if ((copied = rovr->rq_private_buf.buflen) > repsize) 834 copied = repsize; 835 836 /* Suck it into the iovec, verify checksum if not done by hw. */ 837 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 838 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 839 goto out_unlock; 840 } 841 842 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 843 844 /* Something worked... */ 845 dst_confirm(skb_dst(skb)); 846 847 xprt_adjust_cwnd(task, copied); 848 xprt_complete_rqst(task, copied); 849 850 out_unlock: 851 spin_unlock(&xprt->transport_lock); 852 dropit: 853 skb_free_datagram(sk, skb); 854 out: 855 read_unlock(&sk->sk_callback_lock); 856 } 857 858 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 859 { 860 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 861 size_t len, used; 862 char *p; 863 864 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 865 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 866 used = xdr_skb_read_bits(desc, p, len); 867 transport->tcp_offset += used; 868 if (used != len) 869 return; 870 871 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 872 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 873 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 874 else 875 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 876 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 877 878 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 879 transport->tcp_offset = 0; 880 881 /* Sanity check of the record length */ 882 if (unlikely(transport->tcp_reclen < 8)) { 883 dprintk("RPC: invalid TCP record fragment length\n"); 884 xprt_force_disconnect(xprt); 885 return; 886 } 887 dprintk("RPC: reading TCP record fragment of length %d\n", 888 transport->tcp_reclen); 889 } 890 891 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 892 { 893 if (transport->tcp_offset == transport->tcp_reclen) { 894 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 895 transport->tcp_offset = 0; 896 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 897 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 898 transport->tcp_flags |= TCP_RCV_COPY_XID; 899 transport->tcp_copied = 0; 900 } 901 } 902 } 903 904 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 905 { 906 size_t len, used; 907 char *p; 908 909 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 910 dprintk("RPC: reading XID (%Zu bytes)\n", len); 911 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 912 used = xdr_skb_read_bits(desc, p, len); 913 transport->tcp_offset += used; 914 if (used != len) 915 return; 916 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 917 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 918 transport->tcp_copied = 4; 919 dprintk("RPC: reading %s XID %08x\n", 920 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 921 : "request with", 922 ntohl(transport->tcp_xid)); 923 xs_tcp_check_fraghdr(transport); 924 } 925 926 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 927 struct xdr_skb_reader *desc) 928 { 929 size_t len, used; 930 u32 offset; 931 char *p; 932 933 /* 934 * We want transport->tcp_offset to be 8 at the end of this routine 935 * (4 bytes for the xid and 4 bytes for the call/reply flag). 936 * When this function is called for the first time, 937 * transport->tcp_offset is 4 (after having already read the xid). 938 */ 939 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 940 len = sizeof(transport->tcp_calldir) - offset; 941 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 942 p = ((char *) &transport->tcp_calldir) + offset; 943 used = xdr_skb_read_bits(desc, p, len); 944 transport->tcp_offset += used; 945 if (used != len) 946 return; 947 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 948 /* 949 * We don't yet have the XDR buffer, so we will write the calldir 950 * out after we get the buffer from the 'struct rpc_rqst' 951 */ 952 switch (ntohl(transport->tcp_calldir)) { 953 case RPC_REPLY: 954 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 955 transport->tcp_flags |= TCP_RCV_COPY_DATA; 956 transport->tcp_flags |= TCP_RPC_REPLY; 957 break; 958 case RPC_CALL: 959 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 960 transport->tcp_flags |= TCP_RCV_COPY_DATA; 961 transport->tcp_flags &= ~TCP_RPC_REPLY; 962 break; 963 default: 964 dprintk("RPC: invalid request message type\n"); 965 xprt_force_disconnect(&transport->xprt); 966 } 967 xs_tcp_check_fraghdr(transport); 968 } 969 970 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 971 struct xdr_skb_reader *desc, 972 struct rpc_rqst *req) 973 { 974 struct sock_xprt *transport = 975 container_of(xprt, struct sock_xprt, xprt); 976 struct xdr_buf *rcvbuf; 977 size_t len; 978 ssize_t r; 979 980 rcvbuf = &req->rq_private_buf; 981 982 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 983 /* 984 * Save the RPC direction in the XDR buffer 985 */ 986 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 987 &transport->tcp_calldir, 988 sizeof(transport->tcp_calldir)); 989 transport->tcp_copied += sizeof(transport->tcp_calldir); 990 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 991 } 992 993 len = desc->count; 994 if (len > transport->tcp_reclen - transport->tcp_offset) { 995 struct xdr_skb_reader my_desc; 996 997 len = transport->tcp_reclen - transport->tcp_offset; 998 memcpy(&my_desc, desc, sizeof(my_desc)); 999 my_desc.count = len; 1000 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1001 &my_desc, xdr_skb_read_bits); 1002 desc->count -= r; 1003 desc->offset += r; 1004 } else 1005 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1006 desc, xdr_skb_read_bits); 1007 1008 if (r > 0) { 1009 transport->tcp_copied += r; 1010 transport->tcp_offset += r; 1011 } 1012 if (r != len) { 1013 /* Error when copying to the receive buffer, 1014 * usually because we weren't able to allocate 1015 * additional buffer pages. All we can do now 1016 * is turn off TCP_RCV_COPY_DATA, so the request 1017 * will not receive any additional updates, 1018 * and time out. 1019 * Any remaining data from this record will 1020 * be discarded. 1021 */ 1022 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1023 dprintk("RPC: XID %08x truncated request\n", 1024 ntohl(transport->tcp_xid)); 1025 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1026 "tcp_offset = %u, tcp_reclen = %u\n", 1027 xprt, transport->tcp_copied, 1028 transport->tcp_offset, transport->tcp_reclen); 1029 return; 1030 } 1031 1032 dprintk("RPC: XID %08x read %Zd bytes\n", 1033 ntohl(transport->tcp_xid), r); 1034 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1035 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1036 transport->tcp_offset, transport->tcp_reclen); 1037 1038 if (transport->tcp_copied == req->rq_private_buf.buflen) 1039 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1040 else if (transport->tcp_offset == transport->tcp_reclen) { 1041 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1042 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1043 } 1044 } 1045 1046 /* 1047 * Finds the request corresponding to the RPC xid and invokes the common 1048 * tcp read code to read the data. 1049 */ 1050 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1051 struct xdr_skb_reader *desc) 1052 { 1053 struct sock_xprt *transport = 1054 container_of(xprt, struct sock_xprt, xprt); 1055 struct rpc_rqst *req; 1056 1057 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1058 1059 /* Find and lock the request corresponding to this xid */ 1060 spin_lock(&xprt->transport_lock); 1061 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1062 if (!req) { 1063 dprintk("RPC: XID %08x request not found!\n", 1064 ntohl(transport->tcp_xid)); 1065 spin_unlock(&xprt->transport_lock); 1066 return -1; 1067 } 1068 1069 xs_tcp_read_common(xprt, desc, req); 1070 1071 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1072 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1073 1074 spin_unlock(&xprt->transport_lock); 1075 return 0; 1076 } 1077 1078 #if defined(CONFIG_NFS_V4_1) 1079 /* 1080 * Obtains an rpc_rqst previously allocated and invokes the common 1081 * tcp read code to read the data. The result is placed in the callback 1082 * queue. 1083 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1084 * connection and return -1. 1085 */ 1086 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1087 struct xdr_skb_reader *desc) 1088 { 1089 struct sock_xprt *transport = 1090 container_of(xprt, struct sock_xprt, xprt); 1091 struct rpc_rqst *req; 1092 1093 req = xprt_alloc_bc_request(xprt); 1094 if (req == NULL) { 1095 printk(KERN_WARNING "Callback slot table overflowed\n"); 1096 xprt_force_disconnect(xprt); 1097 return -1; 1098 } 1099 1100 req->rq_xid = transport->tcp_xid; 1101 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1102 xs_tcp_read_common(xprt, desc, req); 1103 1104 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1105 struct svc_serv *bc_serv = xprt->bc_serv; 1106 1107 /* 1108 * Add callback request to callback list. The callback 1109 * service sleeps on the sv_cb_waitq waiting for new 1110 * requests. Wake it up after adding enqueing the 1111 * request. 1112 */ 1113 dprintk("RPC: add callback request to list\n"); 1114 spin_lock(&bc_serv->sv_cb_lock); 1115 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1116 spin_unlock(&bc_serv->sv_cb_lock); 1117 wake_up(&bc_serv->sv_cb_waitq); 1118 } 1119 1120 req->rq_private_buf.len = transport->tcp_copied; 1121 1122 return 0; 1123 } 1124 1125 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1126 struct xdr_skb_reader *desc) 1127 { 1128 struct sock_xprt *transport = 1129 container_of(xprt, struct sock_xprt, xprt); 1130 1131 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1132 xs_tcp_read_reply(xprt, desc) : 1133 xs_tcp_read_callback(xprt, desc); 1134 } 1135 #else 1136 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1137 struct xdr_skb_reader *desc) 1138 { 1139 return xs_tcp_read_reply(xprt, desc); 1140 } 1141 #endif /* CONFIG_NFS_V4_1 */ 1142 1143 /* 1144 * Read data off the transport. This can be either an RPC_CALL or an 1145 * RPC_REPLY. Relay the processing to helper functions. 1146 */ 1147 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1148 struct xdr_skb_reader *desc) 1149 { 1150 struct sock_xprt *transport = 1151 container_of(xprt, struct sock_xprt, xprt); 1152 1153 if (_xs_tcp_read_data(xprt, desc) == 0) 1154 xs_tcp_check_fraghdr(transport); 1155 else { 1156 /* 1157 * The transport_lock protects the request handling. 1158 * There's no need to hold it to update the tcp_flags. 1159 */ 1160 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1161 } 1162 } 1163 1164 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1165 { 1166 size_t len; 1167 1168 len = transport->tcp_reclen - transport->tcp_offset; 1169 if (len > desc->count) 1170 len = desc->count; 1171 desc->count -= len; 1172 desc->offset += len; 1173 transport->tcp_offset += len; 1174 dprintk("RPC: discarded %Zu bytes\n", len); 1175 xs_tcp_check_fraghdr(transport); 1176 } 1177 1178 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1179 { 1180 struct rpc_xprt *xprt = rd_desc->arg.data; 1181 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1182 struct xdr_skb_reader desc = { 1183 .skb = skb, 1184 .offset = offset, 1185 .count = len, 1186 }; 1187 1188 dprintk("RPC: xs_tcp_data_recv started\n"); 1189 do { 1190 /* Read in a new fragment marker if necessary */ 1191 /* Can we ever really expect to get completely empty fragments? */ 1192 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1193 xs_tcp_read_fraghdr(xprt, &desc); 1194 continue; 1195 } 1196 /* Read in the xid if necessary */ 1197 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1198 xs_tcp_read_xid(transport, &desc); 1199 continue; 1200 } 1201 /* Read in the call/reply flag */ 1202 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1203 xs_tcp_read_calldir(transport, &desc); 1204 continue; 1205 } 1206 /* Read in the request data */ 1207 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1208 xs_tcp_read_data(xprt, &desc); 1209 continue; 1210 } 1211 /* Skip over any trailing bytes on short reads */ 1212 xs_tcp_read_discard(transport, &desc); 1213 } while (desc.count); 1214 dprintk("RPC: xs_tcp_data_recv done\n"); 1215 return len - desc.count; 1216 } 1217 1218 /** 1219 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1220 * @sk: socket with data to read 1221 * @bytes: how much data to read 1222 * 1223 */ 1224 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1225 { 1226 struct rpc_xprt *xprt; 1227 read_descriptor_t rd_desc; 1228 int read; 1229 1230 dprintk("RPC: xs_tcp_data_ready...\n"); 1231 1232 read_lock(&sk->sk_callback_lock); 1233 if (!(xprt = xprt_from_sock(sk))) 1234 goto out; 1235 if (xprt->shutdown) 1236 goto out; 1237 1238 /* Any data means we had a useful conversation, so 1239 * the we don't need to delay the next reconnect 1240 */ 1241 if (xprt->reestablish_timeout) 1242 xprt->reestablish_timeout = 0; 1243 1244 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1245 rd_desc.arg.data = xprt; 1246 do { 1247 rd_desc.count = 65536; 1248 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1249 } while (read > 0); 1250 out: 1251 read_unlock(&sk->sk_callback_lock); 1252 } 1253 1254 /* 1255 * Do the equivalent of linger/linger2 handling for dealing with 1256 * broken servers that don't close the socket in a timely 1257 * fashion 1258 */ 1259 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1260 unsigned long timeout) 1261 { 1262 struct sock_xprt *transport; 1263 1264 if (xprt_test_and_set_connecting(xprt)) 1265 return; 1266 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1267 transport = container_of(xprt, struct sock_xprt, xprt); 1268 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1269 timeout); 1270 } 1271 1272 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1273 { 1274 struct sock_xprt *transport; 1275 1276 transport = container_of(xprt, struct sock_xprt, xprt); 1277 1278 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1279 !cancel_delayed_work(&transport->connect_worker)) 1280 return; 1281 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1282 xprt_clear_connecting(xprt); 1283 } 1284 1285 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1286 { 1287 smp_mb__before_clear_bit(); 1288 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1289 clear_bit(XPRT_CLOSING, &xprt->state); 1290 smp_mb__after_clear_bit(); 1291 /* Mark transport as closed and wake up all pending tasks */ 1292 xprt_disconnect_done(xprt); 1293 } 1294 1295 /** 1296 * xs_tcp_state_change - callback to handle TCP socket state changes 1297 * @sk: socket whose state has changed 1298 * 1299 */ 1300 static void xs_tcp_state_change(struct sock *sk) 1301 { 1302 struct rpc_xprt *xprt; 1303 1304 read_lock(&sk->sk_callback_lock); 1305 if (!(xprt = xprt_from_sock(sk))) 1306 goto out; 1307 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1308 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1309 sk->sk_state, xprt_connected(xprt), 1310 sock_flag(sk, SOCK_DEAD), 1311 sock_flag(sk, SOCK_ZAPPED), 1312 sk->sk_shutdown); 1313 1314 switch (sk->sk_state) { 1315 case TCP_ESTABLISHED: 1316 spin_lock_bh(&xprt->transport_lock); 1317 if (!xprt_test_and_set_connected(xprt)) { 1318 struct sock_xprt *transport = container_of(xprt, 1319 struct sock_xprt, xprt); 1320 1321 /* Reset TCP record info */ 1322 transport->tcp_offset = 0; 1323 transport->tcp_reclen = 0; 1324 transport->tcp_copied = 0; 1325 transport->tcp_flags = 1326 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1327 1328 xprt_wake_pending_tasks(xprt, -EAGAIN); 1329 } 1330 spin_unlock_bh(&xprt->transport_lock); 1331 break; 1332 case TCP_FIN_WAIT1: 1333 /* The client initiated a shutdown of the socket */ 1334 xprt->connect_cookie++; 1335 xprt->reestablish_timeout = 0; 1336 set_bit(XPRT_CLOSING, &xprt->state); 1337 smp_mb__before_clear_bit(); 1338 clear_bit(XPRT_CONNECTED, &xprt->state); 1339 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1340 smp_mb__after_clear_bit(); 1341 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1342 break; 1343 case TCP_CLOSE_WAIT: 1344 /* The server initiated a shutdown of the socket */ 1345 xprt_force_disconnect(xprt); 1346 case TCP_SYN_SENT: 1347 xprt->connect_cookie++; 1348 case TCP_CLOSING: 1349 /* 1350 * If the server closed down the connection, make sure that 1351 * we back off before reconnecting 1352 */ 1353 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1354 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1355 break; 1356 case TCP_LAST_ACK: 1357 set_bit(XPRT_CLOSING, &xprt->state); 1358 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1359 smp_mb__before_clear_bit(); 1360 clear_bit(XPRT_CONNECTED, &xprt->state); 1361 smp_mb__after_clear_bit(); 1362 break; 1363 case TCP_CLOSE: 1364 xs_tcp_cancel_linger_timeout(xprt); 1365 xs_sock_mark_closed(xprt); 1366 } 1367 out: 1368 read_unlock(&sk->sk_callback_lock); 1369 } 1370 1371 /** 1372 * xs_error_report - callback mainly for catching socket errors 1373 * @sk: socket 1374 */ 1375 static void xs_error_report(struct sock *sk) 1376 { 1377 struct rpc_xprt *xprt; 1378 1379 read_lock(&sk->sk_callback_lock); 1380 if (!(xprt = xprt_from_sock(sk))) 1381 goto out; 1382 dprintk("RPC: %s client %p...\n" 1383 "RPC: error %d\n", 1384 __func__, xprt, sk->sk_err); 1385 xprt_wake_pending_tasks(xprt, -EAGAIN); 1386 out: 1387 read_unlock(&sk->sk_callback_lock); 1388 } 1389 1390 static void xs_write_space(struct sock *sk) 1391 { 1392 struct socket *sock; 1393 struct rpc_xprt *xprt; 1394 1395 if (unlikely(!(sock = sk->sk_socket))) 1396 return; 1397 clear_bit(SOCK_NOSPACE, &sock->flags); 1398 1399 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1400 return; 1401 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1402 return; 1403 1404 xprt_write_space(xprt); 1405 } 1406 1407 /** 1408 * xs_udp_write_space - callback invoked when socket buffer space 1409 * becomes available 1410 * @sk: socket whose state has changed 1411 * 1412 * Called when more output buffer space is available for this socket. 1413 * We try not to wake our writers until they can make "significant" 1414 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1415 * with a bunch of small requests. 1416 */ 1417 static void xs_udp_write_space(struct sock *sk) 1418 { 1419 read_lock(&sk->sk_callback_lock); 1420 1421 /* from net/core/sock.c:sock_def_write_space */ 1422 if (sock_writeable(sk)) 1423 xs_write_space(sk); 1424 1425 read_unlock(&sk->sk_callback_lock); 1426 } 1427 1428 /** 1429 * xs_tcp_write_space - callback invoked when socket buffer space 1430 * becomes available 1431 * @sk: socket whose state has changed 1432 * 1433 * Called when more output buffer space is available for this socket. 1434 * We try not to wake our writers until they can make "significant" 1435 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1436 * with a bunch of small requests. 1437 */ 1438 static void xs_tcp_write_space(struct sock *sk) 1439 { 1440 read_lock(&sk->sk_callback_lock); 1441 1442 /* from net/core/stream.c:sk_stream_write_space */ 1443 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1444 xs_write_space(sk); 1445 1446 read_unlock(&sk->sk_callback_lock); 1447 } 1448 1449 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1450 { 1451 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1452 struct sock *sk = transport->inet; 1453 1454 if (transport->rcvsize) { 1455 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1456 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1457 } 1458 if (transport->sndsize) { 1459 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1460 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1461 sk->sk_write_space(sk); 1462 } 1463 } 1464 1465 /** 1466 * xs_udp_set_buffer_size - set send and receive limits 1467 * @xprt: generic transport 1468 * @sndsize: requested size of send buffer, in bytes 1469 * @rcvsize: requested size of receive buffer, in bytes 1470 * 1471 * Set socket send and receive buffer size limits. 1472 */ 1473 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1474 { 1475 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1476 1477 transport->sndsize = 0; 1478 if (sndsize) 1479 transport->sndsize = sndsize + 1024; 1480 transport->rcvsize = 0; 1481 if (rcvsize) 1482 transport->rcvsize = rcvsize + 1024; 1483 1484 xs_udp_do_set_buffer_size(xprt); 1485 } 1486 1487 /** 1488 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1489 * @task: task that timed out 1490 * 1491 * Adjust the congestion window after a retransmit timeout has occurred. 1492 */ 1493 static void xs_udp_timer(struct rpc_task *task) 1494 { 1495 xprt_adjust_cwnd(task, -ETIMEDOUT); 1496 } 1497 1498 static unsigned short xs_get_random_port(void) 1499 { 1500 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1501 unsigned short rand = (unsigned short) net_random() % range; 1502 return rand + xprt_min_resvport; 1503 } 1504 1505 /** 1506 * xs_set_port - reset the port number in the remote endpoint address 1507 * @xprt: generic transport 1508 * @port: new port number 1509 * 1510 */ 1511 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1512 { 1513 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1514 1515 rpc_set_port(xs_addr(xprt), port); 1516 xs_update_peer_port(xprt); 1517 } 1518 1519 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1520 { 1521 unsigned short port = transport->srcport; 1522 1523 if (port == 0 && transport->xprt.resvport) 1524 port = xs_get_random_port(); 1525 return port; 1526 } 1527 1528 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1529 { 1530 if (transport->srcport != 0) 1531 transport->srcport = 0; 1532 if (!transport->xprt.resvport) 1533 return 0; 1534 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1535 return xprt_max_resvport; 1536 return --port; 1537 } 1538 1539 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1540 { 1541 struct sockaddr_in myaddr = { 1542 .sin_family = AF_INET, 1543 }; 1544 struct sockaddr_in *sa; 1545 int err, nloop = 0; 1546 unsigned short port = xs_get_srcport(transport, sock); 1547 unsigned short last; 1548 1549 sa = (struct sockaddr_in *)&transport->srcaddr; 1550 myaddr.sin_addr = sa->sin_addr; 1551 do { 1552 myaddr.sin_port = htons(port); 1553 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1554 sizeof(myaddr)); 1555 if (port == 0) 1556 break; 1557 if (err == 0) { 1558 transport->srcport = port; 1559 break; 1560 } 1561 last = port; 1562 port = xs_next_srcport(transport, sock, port); 1563 if (port > last) 1564 nloop++; 1565 } while (err == -EADDRINUSE && nloop != 2); 1566 dprintk("RPC: %s %pI4:%u: %s (%d)\n", 1567 __func__, &myaddr.sin_addr, 1568 port, err ? "failed" : "ok", err); 1569 return err; 1570 } 1571 1572 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1573 { 1574 struct sockaddr_in6 myaddr = { 1575 .sin6_family = AF_INET6, 1576 }; 1577 struct sockaddr_in6 *sa; 1578 int err, nloop = 0; 1579 unsigned short port = xs_get_srcport(transport, sock); 1580 unsigned short last; 1581 1582 sa = (struct sockaddr_in6 *)&transport->srcaddr; 1583 myaddr.sin6_addr = sa->sin6_addr; 1584 do { 1585 myaddr.sin6_port = htons(port); 1586 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1587 sizeof(myaddr)); 1588 if (port == 0) 1589 break; 1590 if (err == 0) { 1591 transport->srcport = port; 1592 break; 1593 } 1594 last = port; 1595 port = xs_next_srcport(transport, sock, port); 1596 if (port > last) 1597 nloop++; 1598 } while (err == -EADDRINUSE && nloop != 2); 1599 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", 1600 &myaddr.sin6_addr, port, err ? "failed" : "ok", err); 1601 return err; 1602 } 1603 1604 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1605 static struct lock_class_key xs_key[2]; 1606 static struct lock_class_key xs_slock_key[2]; 1607 1608 static inline void xs_reclassify_socket4(struct socket *sock) 1609 { 1610 struct sock *sk = sock->sk; 1611 1612 BUG_ON(sock_owned_by_user(sk)); 1613 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1614 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1615 } 1616 1617 static inline void xs_reclassify_socket6(struct socket *sock) 1618 { 1619 struct sock *sk = sock->sk; 1620 1621 BUG_ON(sock_owned_by_user(sk)); 1622 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1623 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1624 } 1625 #else 1626 static inline void xs_reclassify_socket4(struct socket *sock) 1627 { 1628 } 1629 1630 static inline void xs_reclassify_socket6(struct socket *sock) 1631 { 1632 } 1633 #endif 1634 1635 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1636 { 1637 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1638 1639 if (!transport->inet) { 1640 struct sock *sk = sock->sk; 1641 1642 write_lock_bh(&sk->sk_callback_lock); 1643 1644 xs_save_old_callbacks(transport, sk); 1645 1646 sk->sk_user_data = xprt; 1647 sk->sk_data_ready = xs_udp_data_ready; 1648 sk->sk_write_space = xs_udp_write_space; 1649 sk->sk_error_report = xs_error_report; 1650 sk->sk_no_check = UDP_CSUM_NORCV; 1651 sk->sk_allocation = GFP_ATOMIC; 1652 1653 xprt_set_connected(xprt); 1654 1655 /* Reset to new socket */ 1656 transport->sock = sock; 1657 transport->inet = sk; 1658 1659 write_unlock_bh(&sk->sk_callback_lock); 1660 } 1661 xs_udp_do_set_buffer_size(xprt); 1662 } 1663 1664 /** 1665 * xs_udp_connect_worker4 - set up a UDP socket 1666 * @work: RPC transport to connect 1667 * 1668 * Invoked by a work queue tasklet. 1669 */ 1670 static void xs_udp_connect_worker4(struct work_struct *work) 1671 { 1672 struct sock_xprt *transport = 1673 container_of(work, struct sock_xprt, connect_worker.work); 1674 struct rpc_xprt *xprt = &transport->xprt; 1675 struct socket *sock = transport->sock; 1676 int err, status = -EIO; 1677 1678 if (xprt->shutdown) 1679 goto out; 1680 1681 /* Start by resetting any existing state */ 1682 xs_reset_transport(transport); 1683 1684 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); 1685 if (err < 0) { 1686 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1687 goto out; 1688 } 1689 xs_reclassify_socket4(sock); 1690 1691 if (xs_bind4(transport, sock)) { 1692 sock_release(sock); 1693 goto out; 1694 } 1695 1696 dprintk("RPC: worker connecting xprt %p via %s to " 1697 "%s (port %s)\n", xprt, 1698 xprt->address_strings[RPC_DISPLAY_PROTO], 1699 xprt->address_strings[RPC_DISPLAY_ADDR], 1700 xprt->address_strings[RPC_DISPLAY_PORT]); 1701 1702 xs_udp_finish_connecting(xprt, sock); 1703 status = 0; 1704 out: 1705 xprt_clear_connecting(xprt); 1706 xprt_wake_pending_tasks(xprt, status); 1707 } 1708 1709 /** 1710 * xs_udp_connect_worker6 - set up a UDP socket 1711 * @work: RPC transport to connect 1712 * 1713 * Invoked by a work queue tasklet. 1714 */ 1715 static void xs_udp_connect_worker6(struct work_struct *work) 1716 { 1717 struct sock_xprt *transport = 1718 container_of(work, struct sock_xprt, connect_worker.work); 1719 struct rpc_xprt *xprt = &transport->xprt; 1720 struct socket *sock = transport->sock; 1721 int err, status = -EIO; 1722 1723 if (xprt->shutdown) 1724 goto out; 1725 1726 /* Start by resetting any existing state */ 1727 xs_reset_transport(transport); 1728 1729 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); 1730 if (err < 0) { 1731 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1732 goto out; 1733 } 1734 xs_reclassify_socket6(sock); 1735 1736 if (xs_bind6(transport, sock) < 0) { 1737 sock_release(sock); 1738 goto out; 1739 } 1740 1741 dprintk("RPC: worker connecting xprt %p via %s to " 1742 "%s (port %s)\n", xprt, 1743 xprt->address_strings[RPC_DISPLAY_PROTO], 1744 xprt->address_strings[RPC_DISPLAY_ADDR], 1745 xprt->address_strings[RPC_DISPLAY_PORT]); 1746 1747 xs_udp_finish_connecting(xprt, sock); 1748 status = 0; 1749 out: 1750 xprt_clear_connecting(xprt); 1751 xprt_wake_pending_tasks(xprt, status); 1752 } 1753 1754 /* 1755 * We need to preserve the port number so the reply cache on the server can 1756 * find our cached RPC replies when we get around to reconnecting. 1757 */ 1758 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) 1759 { 1760 int result; 1761 struct sockaddr any; 1762 1763 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1764 1765 /* 1766 * Disconnect the transport socket by doing a connect operation 1767 * with AF_UNSPEC. This should return immediately... 1768 */ 1769 memset(&any, 0, sizeof(any)); 1770 any.sa_family = AF_UNSPEC; 1771 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1772 if (!result) 1773 xs_sock_mark_closed(xprt); 1774 else 1775 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1776 result); 1777 } 1778 1779 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) 1780 { 1781 unsigned int state = transport->inet->sk_state; 1782 1783 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 1784 /* we don't need to abort the connection if the socket 1785 * hasn't undergone a shutdown 1786 */ 1787 if (transport->inet->sk_shutdown == 0) 1788 return; 1789 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 1790 __func__, transport->inet->sk_shutdown); 1791 } 1792 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 1793 /* we don't need to abort the connection if the socket 1794 * hasn't undergone a shutdown 1795 */ 1796 if (transport->inet->sk_shutdown == 0) 1797 return; 1798 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 1799 "sk_shutdown set to %d\n", 1800 __func__, transport->inet->sk_shutdown); 1801 } 1802 xs_abort_connection(xprt, transport); 1803 } 1804 1805 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1806 { 1807 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1808 1809 if (!transport->inet) { 1810 struct sock *sk = sock->sk; 1811 1812 write_lock_bh(&sk->sk_callback_lock); 1813 1814 xs_save_old_callbacks(transport, sk); 1815 1816 sk->sk_user_data = xprt; 1817 sk->sk_data_ready = xs_tcp_data_ready; 1818 sk->sk_state_change = xs_tcp_state_change; 1819 sk->sk_write_space = xs_tcp_write_space; 1820 sk->sk_error_report = xs_error_report; 1821 sk->sk_allocation = GFP_ATOMIC; 1822 1823 /* socket options */ 1824 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1825 sock_reset_flag(sk, SOCK_LINGER); 1826 tcp_sk(sk)->linger2 = 0; 1827 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1828 1829 xprt_clear_connected(xprt); 1830 1831 /* Reset to new socket */ 1832 transport->sock = sock; 1833 transport->inet = sk; 1834 1835 write_unlock_bh(&sk->sk_callback_lock); 1836 } 1837 1838 if (!xprt_bound(xprt)) 1839 return -ENOTCONN; 1840 1841 /* Tell the socket layer to start connecting... */ 1842 xprt->stat.connect_count++; 1843 xprt->stat.connect_start = jiffies; 1844 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1845 } 1846 1847 /** 1848 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 1849 * @xprt: RPC transport to connect 1850 * @transport: socket transport to connect 1851 * @create_sock: function to create a socket of the correct type 1852 * 1853 * Invoked by a work queue tasklet. 1854 */ 1855 static void xs_tcp_setup_socket(struct rpc_xprt *xprt, 1856 struct sock_xprt *transport, 1857 struct socket *(*create_sock)(struct rpc_xprt *, 1858 struct sock_xprt *)) 1859 { 1860 struct socket *sock = transport->sock; 1861 int status = -EIO; 1862 1863 if (xprt->shutdown) 1864 goto out; 1865 1866 if (!sock) { 1867 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1868 sock = create_sock(xprt, transport); 1869 if (IS_ERR(sock)) { 1870 status = PTR_ERR(sock); 1871 goto out; 1872 } 1873 } else { 1874 int abort_and_exit; 1875 1876 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 1877 &xprt->state); 1878 /* "close" the socket, preserving the local port */ 1879 xs_tcp_reuse_connection(xprt, transport); 1880 1881 if (abort_and_exit) 1882 goto out_eagain; 1883 } 1884 1885 dprintk("RPC: worker connecting xprt %p via %s to " 1886 "%s (port %s)\n", xprt, 1887 xprt->address_strings[RPC_DISPLAY_PROTO], 1888 xprt->address_strings[RPC_DISPLAY_ADDR], 1889 xprt->address_strings[RPC_DISPLAY_PORT]); 1890 1891 status = xs_tcp_finish_connecting(xprt, sock); 1892 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1893 xprt, -status, xprt_connected(xprt), 1894 sock->sk->sk_state); 1895 switch (status) { 1896 default: 1897 printk("%s: connect returned unhandled error %d\n", 1898 __func__, status); 1899 case -EADDRNOTAVAIL: 1900 /* We're probably in TIME_WAIT. Get rid of existing socket, 1901 * and retry 1902 */ 1903 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1904 xprt_force_disconnect(xprt); 1905 break; 1906 case -ECONNREFUSED: 1907 case -ECONNRESET: 1908 case -ENETUNREACH: 1909 /* retry with existing socket, after a delay */ 1910 case 0: 1911 case -EINPROGRESS: 1912 case -EALREADY: 1913 xprt_clear_connecting(xprt); 1914 return; 1915 case -EINVAL: 1916 /* Happens, for instance, if the user specified a link 1917 * local IPv6 address without a scope-id. 1918 */ 1919 goto out; 1920 } 1921 out_eagain: 1922 status = -EAGAIN; 1923 out: 1924 xprt_clear_connecting(xprt); 1925 xprt_wake_pending_tasks(xprt, status); 1926 } 1927 1928 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, 1929 struct sock_xprt *transport) 1930 { 1931 struct socket *sock; 1932 int err; 1933 1934 /* start from scratch */ 1935 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); 1936 if (err < 0) { 1937 dprintk("RPC: can't create TCP transport socket (%d).\n", 1938 -err); 1939 goto out_err; 1940 } 1941 xs_reclassify_socket4(sock); 1942 1943 if (xs_bind4(transport, sock) < 0) { 1944 sock_release(sock); 1945 goto out_err; 1946 } 1947 return sock; 1948 out_err: 1949 return ERR_PTR(-EIO); 1950 } 1951 1952 /** 1953 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1954 * @work: RPC transport to connect 1955 * 1956 * Invoked by a work queue tasklet. 1957 */ 1958 static void xs_tcp_connect_worker4(struct work_struct *work) 1959 { 1960 struct sock_xprt *transport = 1961 container_of(work, struct sock_xprt, connect_worker.work); 1962 struct rpc_xprt *xprt = &transport->xprt; 1963 1964 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); 1965 } 1966 1967 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, 1968 struct sock_xprt *transport) 1969 { 1970 struct socket *sock; 1971 int err; 1972 1973 /* start from scratch */ 1974 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); 1975 if (err < 0) { 1976 dprintk("RPC: can't create TCP transport socket (%d).\n", 1977 -err); 1978 goto out_err; 1979 } 1980 xs_reclassify_socket6(sock); 1981 1982 if (xs_bind6(transport, sock) < 0) { 1983 sock_release(sock); 1984 goto out_err; 1985 } 1986 return sock; 1987 out_err: 1988 return ERR_PTR(-EIO); 1989 } 1990 1991 /** 1992 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1993 * @work: RPC transport to connect 1994 * 1995 * Invoked by a work queue tasklet. 1996 */ 1997 static void xs_tcp_connect_worker6(struct work_struct *work) 1998 { 1999 struct sock_xprt *transport = 2000 container_of(work, struct sock_xprt, connect_worker.work); 2001 struct rpc_xprt *xprt = &transport->xprt; 2002 2003 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); 2004 } 2005 2006 /** 2007 * xs_connect - connect a socket to a remote endpoint 2008 * @task: address of RPC task that manages state of connect request 2009 * 2010 * TCP: If the remote end dropped the connection, delay reconnecting. 2011 * 2012 * UDP socket connects are synchronous, but we use a work queue anyway 2013 * to guarantee that even unprivileged user processes can set up a 2014 * socket on a privileged port. 2015 * 2016 * If a UDP socket connect fails, the delay behavior here prevents 2017 * retry floods (hard mounts). 2018 */ 2019 static void xs_connect(struct rpc_task *task) 2020 { 2021 struct rpc_xprt *xprt = task->tk_xprt; 2022 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2023 2024 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2025 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2026 "seconds\n", 2027 xprt, xprt->reestablish_timeout / HZ); 2028 queue_delayed_work(rpciod_workqueue, 2029 &transport->connect_worker, 2030 xprt->reestablish_timeout); 2031 xprt->reestablish_timeout <<= 1; 2032 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2033 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2034 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2035 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2036 } else { 2037 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2038 queue_delayed_work(rpciod_workqueue, 2039 &transport->connect_worker, 0); 2040 } 2041 } 2042 2043 /** 2044 * xs_udp_print_stats - display UDP socket-specifc stats 2045 * @xprt: rpc_xprt struct containing statistics 2046 * @seq: output file 2047 * 2048 */ 2049 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2050 { 2051 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2052 2053 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 2054 transport->srcport, 2055 xprt->stat.bind_count, 2056 xprt->stat.sends, 2057 xprt->stat.recvs, 2058 xprt->stat.bad_xids, 2059 xprt->stat.req_u, 2060 xprt->stat.bklog_u); 2061 } 2062 2063 /** 2064 * xs_tcp_print_stats - display TCP socket-specifc stats 2065 * @xprt: rpc_xprt struct containing statistics 2066 * @seq: output file 2067 * 2068 */ 2069 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2070 { 2071 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2072 long idle_time = 0; 2073 2074 if (xprt_connected(xprt)) 2075 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2076 2077 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 2078 transport->srcport, 2079 xprt->stat.bind_count, 2080 xprt->stat.connect_count, 2081 xprt->stat.connect_time, 2082 idle_time, 2083 xprt->stat.sends, 2084 xprt->stat.recvs, 2085 xprt->stat.bad_xids, 2086 xprt->stat.req_u, 2087 xprt->stat.bklog_u); 2088 } 2089 2090 /* 2091 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2092 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2093 * to use the server side send routines. 2094 */ 2095 static void *bc_malloc(struct rpc_task *task, size_t size) 2096 { 2097 struct page *page; 2098 struct rpc_buffer *buf; 2099 2100 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2101 page = alloc_page(GFP_KERNEL); 2102 2103 if (!page) 2104 return NULL; 2105 2106 buf = page_address(page); 2107 buf->len = PAGE_SIZE; 2108 2109 return buf->data; 2110 } 2111 2112 /* 2113 * Free the space allocated in the bc_alloc routine 2114 */ 2115 static void bc_free(void *buffer) 2116 { 2117 struct rpc_buffer *buf; 2118 2119 if (!buffer) 2120 return; 2121 2122 buf = container_of(buffer, struct rpc_buffer, data); 2123 free_page((unsigned long)buf); 2124 } 2125 2126 /* 2127 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2128 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2129 */ 2130 static int bc_sendto(struct rpc_rqst *req) 2131 { 2132 int len; 2133 struct xdr_buf *xbufp = &req->rq_snd_buf; 2134 struct rpc_xprt *xprt = req->rq_xprt; 2135 struct sock_xprt *transport = 2136 container_of(xprt, struct sock_xprt, xprt); 2137 struct socket *sock = transport->sock; 2138 unsigned long headoff; 2139 unsigned long tailoff; 2140 2141 /* 2142 * Set up the rpc header and record marker stuff 2143 */ 2144 xs_encode_tcp_record_marker(xbufp); 2145 2146 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2147 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2148 len = svc_send_common(sock, xbufp, 2149 virt_to_page(xbufp->head[0].iov_base), headoff, 2150 xbufp->tail[0].iov_base, tailoff); 2151 2152 if (len != xbufp->len) { 2153 printk(KERN_NOTICE "Error sending entire callback!\n"); 2154 len = -EAGAIN; 2155 } 2156 2157 return len; 2158 } 2159 2160 /* 2161 * The send routine. Borrows from svc_send 2162 */ 2163 static int bc_send_request(struct rpc_task *task) 2164 { 2165 struct rpc_rqst *req = task->tk_rqstp; 2166 struct svc_xprt *xprt; 2167 struct svc_sock *svsk; 2168 u32 len; 2169 2170 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2171 /* 2172 * Get the server socket associated with this callback xprt 2173 */ 2174 xprt = req->rq_xprt->bc_xprt; 2175 svsk = container_of(xprt, struct svc_sock, sk_xprt); 2176 2177 /* 2178 * Grab the mutex to serialize data as the connection is shared 2179 * with the fore channel 2180 */ 2181 if (!mutex_trylock(&xprt->xpt_mutex)) { 2182 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2183 if (!mutex_trylock(&xprt->xpt_mutex)) 2184 return -EAGAIN; 2185 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2186 } 2187 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2188 len = -ENOTCONN; 2189 else 2190 len = bc_sendto(req); 2191 mutex_unlock(&xprt->xpt_mutex); 2192 2193 if (len > 0) 2194 len = 0; 2195 2196 return len; 2197 } 2198 2199 /* 2200 * The close routine. Since this is client initiated, we do nothing 2201 */ 2202 2203 static void bc_close(struct rpc_xprt *xprt) 2204 { 2205 } 2206 2207 /* 2208 * The xprt destroy routine. Again, because this connection is client 2209 * initiated, we do nothing 2210 */ 2211 2212 static void bc_destroy(struct rpc_xprt *xprt) 2213 { 2214 } 2215 2216 static struct rpc_xprt_ops xs_udp_ops = { 2217 .set_buffer_size = xs_udp_set_buffer_size, 2218 .reserve_xprt = xprt_reserve_xprt_cong, 2219 .release_xprt = xprt_release_xprt_cong, 2220 .rpcbind = rpcb_getport_async, 2221 .set_port = xs_set_port, 2222 .connect = xs_connect, 2223 .buf_alloc = rpc_malloc, 2224 .buf_free = rpc_free, 2225 .send_request = xs_udp_send_request, 2226 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2227 .timer = xs_udp_timer, 2228 .release_request = xprt_release_rqst_cong, 2229 .close = xs_close, 2230 .destroy = xs_destroy, 2231 .print_stats = xs_udp_print_stats, 2232 }; 2233 2234 static struct rpc_xprt_ops xs_tcp_ops = { 2235 .reserve_xprt = xprt_reserve_xprt, 2236 .release_xprt = xs_tcp_release_xprt, 2237 .rpcbind = rpcb_getport_async, 2238 .set_port = xs_set_port, 2239 .connect = xs_connect, 2240 .buf_alloc = rpc_malloc, 2241 .buf_free = rpc_free, 2242 .send_request = xs_tcp_send_request, 2243 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2244 .close = xs_tcp_close, 2245 .destroy = xs_destroy, 2246 .print_stats = xs_tcp_print_stats, 2247 }; 2248 2249 /* 2250 * The rpc_xprt_ops for the server backchannel 2251 */ 2252 2253 static struct rpc_xprt_ops bc_tcp_ops = { 2254 .reserve_xprt = xprt_reserve_xprt, 2255 .release_xprt = xprt_release_xprt, 2256 .buf_alloc = bc_malloc, 2257 .buf_free = bc_free, 2258 .send_request = bc_send_request, 2259 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2260 .close = bc_close, 2261 .destroy = bc_destroy, 2262 .print_stats = xs_tcp_print_stats, 2263 }; 2264 2265 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2266 unsigned int slot_table_size) 2267 { 2268 struct rpc_xprt *xprt; 2269 struct sock_xprt *new; 2270 2271 if (args->addrlen > sizeof(xprt->addr)) { 2272 dprintk("RPC: xs_setup_xprt: address too large\n"); 2273 return ERR_PTR(-EBADF); 2274 } 2275 2276 new = kzalloc(sizeof(*new), GFP_KERNEL); 2277 if (new == NULL) { 2278 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2279 "rpc_xprt\n"); 2280 return ERR_PTR(-ENOMEM); 2281 } 2282 xprt = &new->xprt; 2283 2284 xprt->max_reqs = slot_table_size; 2285 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 2286 if (xprt->slot == NULL) { 2287 kfree(xprt); 2288 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 2289 "table\n"); 2290 return ERR_PTR(-ENOMEM); 2291 } 2292 2293 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2294 xprt->addrlen = args->addrlen; 2295 if (args->srcaddr) 2296 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2297 2298 return xprt; 2299 } 2300 2301 static const struct rpc_timeout xs_udp_default_timeout = { 2302 .to_initval = 5 * HZ, 2303 .to_maxval = 30 * HZ, 2304 .to_increment = 5 * HZ, 2305 .to_retries = 5, 2306 }; 2307 2308 /** 2309 * xs_setup_udp - Set up transport to use a UDP socket 2310 * @args: rpc transport creation arguments 2311 * 2312 */ 2313 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2314 { 2315 struct sockaddr *addr = args->dstaddr; 2316 struct rpc_xprt *xprt; 2317 struct sock_xprt *transport; 2318 struct rpc_xprt *ret; 2319 2320 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 2321 if (IS_ERR(xprt)) 2322 return xprt; 2323 transport = container_of(xprt, struct sock_xprt, xprt); 2324 2325 xprt->prot = IPPROTO_UDP; 2326 xprt->tsh_size = 0; 2327 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2328 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2329 2330 xprt->bind_timeout = XS_BIND_TO; 2331 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2332 xprt->idle_timeout = XS_IDLE_DISC_TO; 2333 2334 xprt->ops = &xs_udp_ops; 2335 2336 xprt->timeout = &xs_udp_default_timeout; 2337 2338 switch (addr->sa_family) { 2339 case AF_INET: 2340 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2341 xprt_set_bound(xprt); 2342 2343 INIT_DELAYED_WORK(&transport->connect_worker, 2344 xs_udp_connect_worker4); 2345 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2346 break; 2347 case AF_INET6: 2348 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2349 xprt_set_bound(xprt); 2350 2351 INIT_DELAYED_WORK(&transport->connect_worker, 2352 xs_udp_connect_worker6); 2353 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2354 break; 2355 default: 2356 ret = ERR_PTR(-EAFNOSUPPORT); 2357 goto out_err; 2358 } 2359 2360 if (xprt_bound(xprt)) 2361 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2362 xprt->address_strings[RPC_DISPLAY_ADDR], 2363 xprt->address_strings[RPC_DISPLAY_PORT], 2364 xprt->address_strings[RPC_DISPLAY_PROTO]); 2365 else 2366 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2367 xprt->address_strings[RPC_DISPLAY_ADDR], 2368 xprt->address_strings[RPC_DISPLAY_PROTO]); 2369 2370 if (try_module_get(THIS_MODULE)) 2371 return xprt; 2372 ret = ERR_PTR(-EINVAL); 2373 out_err: 2374 kfree(xprt->slot); 2375 kfree(xprt); 2376 return ret; 2377 } 2378 2379 static const struct rpc_timeout xs_tcp_default_timeout = { 2380 .to_initval = 60 * HZ, 2381 .to_maxval = 60 * HZ, 2382 .to_retries = 2, 2383 }; 2384 2385 /** 2386 * xs_setup_tcp - Set up transport to use a TCP socket 2387 * @args: rpc transport creation arguments 2388 * 2389 */ 2390 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2391 { 2392 struct sockaddr *addr = args->dstaddr; 2393 struct rpc_xprt *xprt; 2394 struct sock_xprt *transport; 2395 struct rpc_xprt *ret; 2396 2397 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2398 if (IS_ERR(xprt)) 2399 return xprt; 2400 transport = container_of(xprt, struct sock_xprt, xprt); 2401 2402 xprt->prot = IPPROTO_TCP; 2403 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2404 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2405 2406 xprt->bind_timeout = XS_BIND_TO; 2407 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2408 xprt->idle_timeout = XS_IDLE_DISC_TO; 2409 2410 xprt->ops = &xs_tcp_ops; 2411 xprt->timeout = &xs_tcp_default_timeout; 2412 2413 switch (addr->sa_family) { 2414 case AF_INET: 2415 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2416 xprt_set_bound(xprt); 2417 2418 INIT_DELAYED_WORK(&transport->connect_worker, 2419 xs_tcp_connect_worker4); 2420 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2421 break; 2422 case AF_INET6: 2423 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2424 xprt_set_bound(xprt); 2425 2426 INIT_DELAYED_WORK(&transport->connect_worker, 2427 xs_tcp_connect_worker6); 2428 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2429 break; 2430 default: 2431 ret = ERR_PTR(-EAFNOSUPPORT); 2432 goto out_err; 2433 } 2434 2435 if (xprt_bound(xprt)) 2436 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2437 xprt->address_strings[RPC_DISPLAY_ADDR], 2438 xprt->address_strings[RPC_DISPLAY_PORT], 2439 xprt->address_strings[RPC_DISPLAY_PROTO]); 2440 else 2441 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2442 xprt->address_strings[RPC_DISPLAY_ADDR], 2443 xprt->address_strings[RPC_DISPLAY_PROTO]); 2444 2445 2446 if (try_module_get(THIS_MODULE)) 2447 return xprt; 2448 ret = ERR_PTR(-EINVAL); 2449 out_err: 2450 kfree(xprt->slot); 2451 kfree(xprt); 2452 return ret; 2453 } 2454 2455 /** 2456 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2457 * @args: rpc transport creation arguments 2458 * 2459 */ 2460 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2461 { 2462 struct sockaddr *addr = args->dstaddr; 2463 struct rpc_xprt *xprt; 2464 struct sock_xprt *transport; 2465 struct svc_sock *bc_sock; 2466 struct rpc_xprt *ret; 2467 2468 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2469 if (IS_ERR(xprt)) 2470 return xprt; 2471 transport = container_of(xprt, struct sock_xprt, xprt); 2472 2473 xprt->prot = IPPROTO_TCP; 2474 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2475 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2476 xprt->timeout = &xs_tcp_default_timeout; 2477 2478 /* backchannel */ 2479 xprt_set_bound(xprt); 2480 xprt->bind_timeout = 0; 2481 xprt->reestablish_timeout = 0; 2482 xprt->idle_timeout = 0; 2483 2484 /* 2485 * The backchannel uses the same socket connection as the 2486 * forechannel 2487 */ 2488 xprt->bc_xprt = args->bc_xprt; 2489 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2490 bc_sock->sk_bc_xprt = xprt; 2491 transport->sock = bc_sock->sk_sock; 2492 transport->inet = bc_sock->sk_sk; 2493 2494 xprt->ops = &bc_tcp_ops; 2495 2496 switch (addr->sa_family) { 2497 case AF_INET: 2498 xs_format_peer_addresses(xprt, "tcp", 2499 RPCBIND_NETID_TCP); 2500 break; 2501 case AF_INET6: 2502 xs_format_peer_addresses(xprt, "tcp", 2503 RPCBIND_NETID_TCP6); 2504 break; 2505 default: 2506 ret = ERR_PTR(-EAFNOSUPPORT); 2507 goto out_err; 2508 } 2509 2510 if (xprt_bound(xprt)) 2511 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2512 xprt->address_strings[RPC_DISPLAY_ADDR], 2513 xprt->address_strings[RPC_DISPLAY_PORT], 2514 xprt->address_strings[RPC_DISPLAY_PROTO]); 2515 else 2516 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2517 xprt->address_strings[RPC_DISPLAY_ADDR], 2518 xprt->address_strings[RPC_DISPLAY_PROTO]); 2519 2520 /* 2521 * Since we don't want connections for the backchannel, we set 2522 * the xprt status to connected 2523 */ 2524 xprt_set_connected(xprt); 2525 2526 2527 if (try_module_get(THIS_MODULE)) 2528 return xprt; 2529 ret = ERR_PTR(-EINVAL); 2530 out_err: 2531 kfree(xprt->slot); 2532 kfree(xprt); 2533 return ret; 2534 } 2535 2536 static struct xprt_class xs_udp_transport = { 2537 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2538 .name = "udp", 2539 .owner = THIS_MODULE, 2540 .ident = XPRT_TRANSPORT_UDP, 2541 .setup = xs_setup_udp, 2542 }; 2543 2544 static struct xprt_class xs_tcp_transport = { 2545 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2546 .name = "tcp", 2547 .owner = THIS_MODULE, 2548 .ident = XPRT_TRANSPORT_TCP, 2549 .setup = xs_setup_tcp, 2550 }; 2551 2552 static struct xprt_class xs_bc_tcp_transport = { 2553 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2554 .name = "tcp NFSv4.1 backchannel", 2555 .owner = THIS_MODULE, 2556 .ident = XPRT_TRANSPORT_BC_TCP, 2557 .setup = xs_setup_bc_tcp, 2558 }; 2559 2560 /** 2561 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2562 * 2563 */ 2564 int init_socket_xprt(void) 2565 { 2566 #ifdef RPC_DEBUG 2567 if (!sunrpc_table_header) 2568 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2569 #endif 2570 2571 xprt_register_transport(&xs_udp_transport); 2572 xprt_register_transport(&xs_tcp_transport); 2573 xprt_register_transport(&xs_bc_tcp_transport); 2574 2575 return 0; 2576 } 2577 2578 /** 2579 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2580 * 2581 */ 2582 void cleanup_socket_xprt(void) 2583 { 2584 #ifdef RPC_DEBUG 2585 if (sunrpc_table_header) { 2586 unregister_sysctl_table(sunrpc_table_header); 2587 sunrpc_table_header = NULL; 2588 } 2589 #endif 2590 2591 xprt_unregister_transport(&xs_udp_transport); 2592 xprt_unregister_transport(&xs_tcp_transport); 2593 xprt_unregister_transport(&xs_bc_tcp_transport); 2594 } 2595 2596 static int param_set_uint_minmax(const char *val, 2597 const struct kernel_param *kp, 2598 unsigned int min, unsigned int max) 2599 { 2600 unsigned long num; 2601 int ret; 2602 2603 if (!val) 2604 return -EINVAL; 2605 ret = strict_strtoul(val, 0, &num); 2606 if (ret == -EINVAL || num < min || num > max) 2607 return -EINVAL; 2608 *((unsigned int *)kp->arg) = num; 2609 return 0; 2610 } 2611 2612 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2613 { 2614 return param_set_uint_minmax(val, kp, 2615 RPC_MIN_RESVPORT, 2616 RPC_MAX_RESVPORT); 2617 } 2618 2619 static struct kernel_param_ops param_ops_portnr = { 2620 .set = param_set_portnr, 2621 .get = param_get_uint, 2622 }; 2623 2624 #define param_check_portnr(name, p) \ 2625 __param_check(name, p, unsigned int); 2626 2627 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 2628 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 2629 2630 static int param_set_slot_table_size(const char *val, 2631 const struct kernel_param *kp) 2632 { 2633 return param_set_uint_minmax(val, kp, 2634 RPC_MIN_SLOT_TABLE, 2635 RPC_MAX_SLOT_TABLE); 2636 } 2637 2638 static struct kernel_param_ops param_ops_slot_table_size = { 2639 .set = param_set_slot_table_size, 2640 .get = param_get_uint, 2641 }; 2642 2643 #define param_check_slot_table_size(name, p) \ 2644 __param_check(name, p, unsigned int); 2645 2646 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 2647 slot_table_size, 0644); 2648 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 2649 slot_table_size, 0644); 2650 2651