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 occurred, 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 occurred, 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 transport->srcport = 0; 714 715 write_lock_bh(&sk->sk_callback_lock); 716 transport->inet = NULL; 717 transport->sock = NULL; 718 719 sk->sk_user_data = NULL; 720 721 xs_restore_old_callbacks(transport, sk); 722 write_unlock_bh(&sk->sk_callback_lock); 723 724 sk->sk_no_check = 0; 725 726 sock_release(sock); 727 } 728 729 /** 730 * xs_close - close a socket 731 * @xprt: transport 732 * 733 * This is used when all requests are complete; ie, no DRC state remains 734 * on the server we want to save. 735 * 736 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 737 * xs_reset_transport() zeroing the socket from underneath a writer. 738 */ 739 static void xs_close(struct rpc_xprt *xprt) 740 { 741 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 742 743 dprintk("RPC: xs_close xprt %p\n", xprt); 744 745 xs_reset_transport(transport); 746 xprt->reestablish_timeout = 0; 747 748 smp_mb__before_clear_bit(); 749 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 750 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 751 clear_bit(XPRT_CLOSING, &xprt->state); 752 smp_mb__after_clear_bit(); 753 xprt_disconnect_done(xprt); 754 } 755 756 static void xs_tcp_close(struct rpc_xprt *xprt) 757 { 758 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 759 xs_close(xprt); 760 else 761 xs_tcp_shutdown(xprt); 762 } 763 764 /** 765 * xs_destroy - prepare to shutdown a transport 766 * @xprt: doomed transport 767 * 768 */ 769 static void xs_destroy(struct rpc_xprt *xprt) 770 { 771 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 772 773 dprintk("RPC: xs_destroy xprt %p\n", xprt); 774 775 cancel_delayed_work_sync(&transport->connect_worker); 776 777 xs_close(xprt); 778 xs_free_peer_addresses(xprt); 779 xprt_free(xprt); 780 module_put(THIS_MODULE); 781 } 782 783 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 784 { 785 return (struct rpc_xprt *) sk->sk_user_data; 786 } 787 788 /** 789 * xs_udp_data_ready - "data ready" callback for UDP sockets 790 * @sk: socket with data to read 791 * @len: how much data to read 792 * 793 */ 794 static void xs_udp_data_ready(struct sock *sk, int len) 795 { 796 struct rpc_task *task; 797 struct rpc_xprt *xprt; 798 struct rpc_rqst *rovr; 799 struct sk_buff *skb; 800 int err, repsize, copied; 801 u32 _xid; 802 __be32 *xp; 803 804 read_lock_bh(&sk->sk_callback_lock); 805 dprintk("RPC: xs_udp_data_ready...\n"); 806 if (!(xprt = xprt_from_sock(sk))) 807 goto out; 808 809 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 810 goto out; 811 812 if (xprt->shutdown) 813 goto dropit; 814 815 repsize = skb->len - sizeof(struct udphdr); 816 if (repsize < 4) { 817 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 818 goto dropit; 819 } 820 821 /* Copy the XID from the skb... */ 822 xp = skb_header_pointer(skb, sizeof(struct udphdr), 823 sizeof(_xid), &_xid); 824 if (xp == NULL) 825 goto dropit; 826 827 /* Look up and lock the request corresponding to the given XID */ 828 spin_lock(&xprt->transport_lock); 829 rovr = xprt_lookup_rqst(xprt, *xp); 830 if (!rovr) 831 goto out_unlock; 832 task = rovr->rq_task; 833 834 if ((copied = rovr->rq_private_buf.buflen) > repsize) 835 copied = repsize; 836 837 /* Suck it into the iovec, verify checksum if not done by hw. */ 838 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 839 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 840 goto out_unlock; 841 } 842 843 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 844 845 /* Something worked... */ 846 dst_confirm(skb_dst(skb)); 847 848 xprt_adjust_cwnd(task, copied); 849 xprt_complete_rqst(task, copied); 850 851 out_unlock: 852 spin_unlock(&xprt->transport_lock); 853 dropit: 854 skb_free_datagram(sk, skb); 855 out: 856 read_unlock_bh(&sk->sk_callback_lock); 857 } 858 859 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 860 { 861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 862 size_t len, used; 863 char *p; 864 865 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 866 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 867 used = xdr_skb_read_bits(desc, p, len); 868 transport->tcp_offset += used; 869 if (used != len) 870 return; 871 872 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 873 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 874 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 875 else 876 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 877 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 878 879 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 880 transport->tcp_offset = 0; 881 882 /* Sanity check of the record length */ 883 if (unlikely(transport->tcp_reclen < 8)) { 884 dprintk("RPC: invalid TCP record fragment length\n"); 885 xprt_force_disconnect(xprt); 886 return; 887 } 888 dprintk("RPC: reading TCP record fragment of length %d\n", 889 transport->tcp_reclen); 890 } 891 892 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 893 { 894 if (transport->tcp_offset == transport->tcp_reclen) { 895 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 896 transport->tcp_offset = 0; 897 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 898 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 899 transport->tcp_flags |= TCP_RCV_COPY_XID; 900 transport->tcp_copied = 0; 901 } 902 } 903 } 904 905 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 906 { 907 size_t len, used; 908 char *p; 909 910 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 911 dprintk("RPC: reading XID (%Zu bytes)\n", len); 912 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 913 used = xdr_skb_read_bits(desc, p, len); 914 transport->tcp_offset += used; 915 if (used != len) 916 return; 917 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 918 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 919 transport->tcp_copied = 4; 920 dprintk("RPC: reading %s XID %08x\n", 921 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 922 : "request with", 923 ntohl(transport->tcp_xid)); 924 xs_tcp_check_fraghdr(transport); 925 } 926 927 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 928 struct xdr_skb_reader *desc) 929 { 930 size_t len, used; 931 u32 offset; 932 char *p; 933 934 /* 935 * We want transport->tcp_offset to be 8 at the end of this routine 936 * (4 bytes for the xid and 4 bytes for the call/reply flag). 937 * When this function is called for the first time, 938 * transport->tcp_offset is 4 (after having already read the xid). 939 */ 940 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 941 len = sizeof(transport->tcp_calldir) - offset; 942 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 943 p = ((char *) &transport->tcp_calldir) + offset; 944 used = xdr_skb_read_bits(desc, p, len); 945 transport->tcp_offset += used; 946 if (used != len) 947 return; 948 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 949 /* 950 * We don't yet have the XDR buffer, so we will write the calldir 951 * out after we get the buffer from the 'struct rpc_rqst' 952 */ 953 switch (ntohl(transport->tcp_calldir)) { 954 case RPC_REPLY: 955 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 956 transport->tcp_flags |= TCP_RCV_COPY_DATA; 957 transport->tcp_flags |= TCP_RPC_REPLY; 958 break; 959 case RPC_CALL: 960 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 961 transport->tcp_flags |= TCP_RCV_COPY_DATA; 962 transport->tcp_flags &= ~TCP_RPC_REPLY; 963 break; 964 default: 965 dprintk("RPC: invalid request message type\n"); 966 xprt_force_disconnect(&transport->xprt); 967 } 968 xs_tcp_check_fraghdr(transport); 969 } 970 971 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 972 struct xdr_skb_reader *desc, 973 struct rpc_rqst *req) 974 { 975 struct sock_xprt *transport = 976 container_of(xprt, struct sock_xprt, xprt); 977 struct xdr_buf *rcvbuf; 978 size_t len; 979 ssize_t r; 980 981 rcvbuf = &req->rq_private_buf; 982 983 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 984 /* 985 * Save the RPC direction in the XDR buffer 986 */ 987 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 988 &transport->tcp_calldir, 989 sizeof(transport->tcp_calldir)); 990 transport->tcp_copied += sizeof(transport->tcp_calldir); 991 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 992 } 993 994 len = desc->count; 995 if (len > transport->tcp_reclen - transport->tcp_offset) { 996 struct xdr_skb_reader my_desc; 997 998 len = transport->tcp_reclen - transport->tcp_offset; 999 memcpy(&my_desc, desc, sizeof(my_desc)); 1000 my_desc.count = len; 1001 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1002 &my_desc, xdr_skb_read_bits); 1003 desc->count -= r; 1004 desc->offset += r; 1005 } else 1006 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1007 desc, xdr_skb_read_bits); 1008 1009 if (r > 0) { 1010 transport->tcp_copied += r; 1011 transport->tcp_offset += r; 1012 } 1013 if (r != len) { 1014 /* Error when copying to the receive buffer, 1015 * usually because we weren't able to allocate 1016 * additional buffer pages. All we can do now 1017 * is turn off TCP_RCV_COPY_DATA, so the request 1018 * will not receive any additional updates, 1019 * and time out. 1020 * Any remaining data from this record will 1021 * be discarded. 1022 */ 1023 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1024 dprintk("RPC: XID %08x truncated request\n", 1025 ntohl(transport->tcp_xid)); 1026 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1027 "tcp_offset = %u, tcp_reclen = %u\n", 1028 xprt, transport->tcp_copied, 1029 transport->tcp_offset, transport->tcp_reclen); 1030 return; 1031 } 1032 1033 dprintk("RPC: XID %08x read %Zd bytes\n", 1034 ntohl(transport->tcp_xid), r); 1035 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1036 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1037 transport->tcp_offset, transport->tcp_reclen); 1038 1039 if (transport->tcp_copied == req->rq_private_buf.buflen) 1040 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1041 else if (transport->tcp_offset == transport->tcp_reclen) { 1042 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1043 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1044 } 1045 } 1046 1047 /* 1048 * Finds the request corresponding to the RPC xid and invokes the common 1049 * tcp read code to read the data. 1050 */ 1051 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1052 struct xdr_skb_reader *desc) 1053 { 1054 struct sock_xprt *transport = 1055 container_of(xprt, struct sock_xprt, xprt); 1056 struct rpc_rqst *req; 1057 1058 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1059 1060 /* Find and lock the request corresponding to this xid */ 1061 spin_lock(&xprt->transport_lock); 1062 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1063 if (!req) { 1064 dprintk("RPC: XID %08x request not found!\n", 1065 ntohl(transport->tcp_xid)); 1066 spin_unlock(&xprt->transport_lock); 1067 return -1; 1068 } 1069 1070 xs_tcp_read_common(xprt, desc, req); 1071 1072 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1073 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1074 1075 spin_unlock(&xprt->transport_lock); 1076 return 0; 1077 } 1078 1079 #if defined(CONFIG_NFS_V4_1) 1080 /* 1081 * Obtains an rpc_rqst previously allocated and invokes the common 1082 * tcp read code to read the data. The result is placed in the callback 1083 * queue. 1084 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1085 * connection and return -1. 1086 */ 1087 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1088 struct xdr_skb_reader *desc) 1089 { 1090 struct sock_xprt *transport = 1091 container_of(xprt, struct sock_xprt, xprt); 1092 struct rpc_rqst *req; 1093 1094 req = xprt_alloc_bc_request(xprt); 1095 if (req == NULL) { 1096 printk(KERN_WARNING "Callback slot table overflowed\n"); 1097 xprt_force_disconnect(xprt); 1098 return -1; 1099 } 1100 1101 req->rq_xid = transport->tcp_xid; 1102 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1103 xs_tcp_read_common(xprt, desc, req); 1104 1105 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1106 struct svc_serv *bc_serv = xprt->bc_serv; 1107 1108 /* 1109 * Add callback request to callback list. The callback 1110 * service sleeps on the sv_cb_waitq waiting for new 1111 * requests. Wake it up after adding enqueing the 1112 * request. 1113 */ 1114 dprintk("RPC: add callback request to list\n"); 1115 spin_lock(&bc_serv->sv_cb_lock); 1116 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1117 spin_unlock(&bc_serv->sv_cb_lock); 1118 wake_up(&bc_serv->sv_cb_waitq); 1119 } 1120 1121 req->rq_private_buf.len = transport->tcp_copied; 1122 1123 return 0; 1124 } 1125 1126 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1127 struct xdr_skb_reader *desc) 1128 { 1129 struct sock_xprt *transport = 1130 container_of(xprt, struct sock_xprt, xprt); 1131 1132 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1133 xs_tcp_read_reply(xprt, desc) : 1134 xs_tcp_read_callback(xprt, desc); 1135 } 1136 #else 1137 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1138 struct xdr_skb_reader *desc) 1139 { 1140 return xs_tcp_read_reply(xprt, desc); 1141 } 1142 #endif /* CONFIG_NFS_V4_1 */ 1143 1144 /* 1145 * Read data off the transport. This can be either an RPC_CALL or an 1146 * RPC_REPLY. Relay the processing to helper functions. 1147 */ 1148 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1149 struct xdr_skb_reader *desc) 1150 { 1151 struct sock_xprt *transport = 1152 container_of(xprt, struct sock_xprt, xprt); 1153 1154 if (_xs_tcp_read_data(xprt, desc) == 0) 1155 xs_tcp_check_fraghdr(transport); 1156 else { 1157 /* 1158 * The transport_lock protects the request handling. 1159 * There's no need to hold it to update the tcp_flags. 1160 */ 1161 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1162 } 1163 } 1164 1165 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1166 { 1167 size_t len; 1168 1169 len = transport->tcp_reclen - transport->tcp_offset; 1170 if (len > desc->count) 1171 len = desc->count; 1172 desc->count -= len; 1173 desc->offset += len; 1174 transport->tcp_offset += len; 1175 dprintk("RPC: discarded %Zu bytes\n", len); 1176 xs_tcp_check_fraghdr(transport); 1177 } 1178 1179 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1180 { 1181 struct rpc_xprt *xprt = rd_desc->arg.data; 1182 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1183 struct xdr_skb_reader desc = { 1184 .skb = skb, 1185 .offset = offset, 1186 .count = len, 1187 }; 1188 1189 dprintk("RPC: xs_tcp_data_recv started\n"); 1190 do { 1191 /* Read in a new fragment marker if necessary */ 1192 /* Can we ever really expect to get completely empty fragments? */ 1193 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1194 xs_tcp_read_fraghdr(xprt, &desc); 1195 continue; 1196 } 1197 /* Read in the xid if necessary */ 1198 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1199 xs_tcp_read_xid(transport, &desc); 1200 continue; 1201 } 1202 /* Read in the call/reply flag */ 1203 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1204 xs_tcp_read_calldir(transport, &desc); 1205 continue; 1206 } 1207 /* Read in the request data */ 1208 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1209 xs_tcp_read_data(xprt, &desc); 1210 continue; 1211 } 1212 /* Skip over any trailing bytes on short reads */ 1213 xs_tcp_read_discard(transport, &desc); 1214 } while (desc.count); 1215 dprintk("RPC: xs_tcp_data_recv done\n"); 1216 return len - desc.count; 1217 } 1218 1219 /** 1220 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1221 * @sk: socket with data to read 1222 * @bytes: how much data to read 1223 * 1224 */ 1225 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1226 { 1227 struct rpc_xprt *xprt; 1228 read_descriptor_t rd_desc; 1229 int read; 1230 1231 dprintk("RPC: xs_tcp_data_ready...\n"); 1232 1233 read_lock_bh(&sk->sk_callback_lock); 1234 if (!(xprt = xprt_from_sock(sk))) 1235 goto out; 1236 if (xprt->shutdown) 1237 goto out; 1238 1239 /* Any data means we had a useful conversation, so 1240 * the we don't need to delay the next reconnect 1241 */ 1242 if (xprt->reestablish_timeout) 1243 xprt->reestablish_timeout = 0; 1244 1245 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1246 rd_desc.arg.data = xprt; 1247 do { 1248 rd_desc.count = 65536; 1249 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1250 } while (read > 0); 1251 out: 1252 read_unlock_bh(&sk->sk_callback_lock); 1253 } 1254 1255 /* 1256 * Do the equivalent of linger/linger2 handling for dealing with 1257 * broken servers that don't close the socket in a timely 1258 * fashion 1259 */ 1260 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1261 unsigned long timeout) 1262 { 1263 struct sock_xprt *transport; 1264 1265 if (xprt_test_and_set_connecting(xprt)) 1266 return; 1267 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1268 transport = container_of(xprt, struct sock_xprt, xprt); 1269 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1270 timeout); 1271 } 1272 1273 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1274 { 1275 struct sock_xprt *transport; 1276 1277 transport = container_of(xprt, struct sock_xprt, xprt); 1278 1279 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1280 !cancel_delayed_work(&transport->connect_worker)) 1281 return; 1282 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1283 xprt_clear_connecting(xprt); 1284 } 1285 1286 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1287 { 1288 smp_mb__before_clear_bit(); 1289 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1290 clear_bit(XPRT_CLOSING, &xprt->state); 1291 smp_mb__after_clear_bit(); 1292 /* Mark transport as closed and wake up all pending tasks */ 1293 xprt_disconnect_done(xprt); 1294 } 1295 1296 /** 1297 * xs_tcp_state_change - callback to handle TCP socket state changes 1298 * @sk: socket whose state has changed 1299 * 1300 */ 1301 static void xs_tcp_state_change(struct sock *sk) 1302 { 1303 struct rpc_xprt *xprt; 1304 1305 read_lock_bh(&sk->sk_callback_lock); 1306 if (!(xprt = xprt_from_sock(sk))) 1307 goto out; 1308 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1309 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1310 sk->sk_state, xprt_connected(xprt), 1311 sock_flag(sk, SOCK_DEAD), 1312 sock_flag(sk, SOCK_ZAPPED), 1313 sk->sk_shutdown); 1314 1315 switch (sk->sk_state) { 1316 case TCP_ESTABLISHED: 1317 spin_lock(&xprt->transport_lock); 1318 if (!xprt_test_and_set_connected(xprt)) { 1319 struct sock_xprt *transport = container_of(xprt, 1320 struct sock_xprt, xprt); 1321 1322 /* Reset TCP record info */ 1323 transport->tcp_offset = 0; 1324 transport->tcp_reclen = 0; 1325 transport->tcp_copied = 0; 1326 transport->tcp_flags = 1327 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1328 1329 xprt_wake_pending_tasks(xprt, -EAGAIN); 1330 } 1331 spin_unlock(&xprt->transport_lock); 1332 break; 1333 case TCP_FIN_WAIT1: 1334 /* The client initiated a shutdown of the socket */ 1335 xprt->connect_cookie++; 1336 xprt->reestablish_timeout = 0; 1337 set_bit(XPRT_CLOSING, &xprt->state); 1338 smp_mb__before_clear_bit(); 1339 clear_bit(XPRT_CONNECTED, &xprt->state); 1340 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1341 smp_mb__after_clear_bit(); 1342 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1343 break; 1344 case TCP_CLOSE_WAIT: 1345 /* The server initiated a shutdown of the socket */ 1346 xprt_force_disconnect(xprt); 1347 case TCP_SYN_SENT: 1348 xprt->connect_cookie++; 1349 case TCP_CLOSING: 1350 /* 1351 * If the server closed down the connection, make sure that 1352 * we back off before reconnecting 1353 */ 1354 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1355 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1356 break; 1357 case TCP_LAST_ACK: 1358 set_bit(XPRT_CLOSING, &xprt->state); 1359 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1360 smp_mb__before_clear_bit(); 1361 clear_bit(XPRT_CONNECTED, &xprt->state); 1362 smp_mb__after_clear_bit(); 1363 break; 1364 case TCP_CLOSE: 1365 xs_tcp_cancel_linger_timeout(xprt); 1366 xs_sock_mark_closed(xprt); 1367 } 1368 out: 1369 read_unlock_bh(&sk->sk_callback_lock); 1370 } 1371 1372 /** 1373 * xs_error_report - callback mainly for catching socket errors 1374 * @sk: socket 1375 */ 1376 static void xs_error_report(struct sock *sk) 1377 { 1378 struct rpc_xprt *xprt; 1379 1380 read_lock_bh(&sk->sk_callback_lock); 1381 if (!(xprt = xprt_from_sock(sk))) 1382 goto out; 1383 dprintk("RPC: %s client %p...\n" 1384 "RPC: error %d\n", 1385 __func__, xprt, sk->sk_err); 1386 xprt_wake_pending_tasks(xprt, -EAGAIN); 1387 out: 1388 read_unlock_bh(&sk->sk_callback_lock); 1389 } 1390 1391 static void xs_write_space(struct sock *sk) 1392 { 1393 struct socket *sock; 1394 struct rpc_xprt *xprt; 1395 1396 if (unlikely(!(sock = sk->sk_socket))) 1397 return; 1398 clear_bit(SOCK_NOSPACE, &sock->flags); 1399 1400 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1401 return; 1402 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1403 return; 1404 1405 xprt_write_space(xprt); 1406 } 1407 1408 /** 1409 * xs_udp_write_space - callback invoked when socket buffer space 1410 * becomes available 1411 * @sk: socket whose state has changed 1412 * 1413 * Called when more output buffer space is available for this socket. 1414 * We try not to wake our writers until they can make "significant" 1415 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1416 * with a bunch of small requests. 1417 */ 1418 static void xs_udp_write_space(struct sock *sk) 1419 { 1420 read_lock_bh(&sk->sk_callback_lock); 1421 1422 /* from net/core/sock.c:sock_def_write_space */ 1423 if (sock_writeable(sk)) 1424 xs_write_space(sk); 1425 1426 read_unlock_bh(&sk->sk_callback_lock); 1427 } 1428 1429 /** 1430 * xs_tcp_write_space - callback invoked when socket buffer space 1431 * becomes available 1432 * @sk: socket whose state has changed 1433 * 1434 * Called when more output buffer space is available for this socket. 1435 * We try not to wake our writers until they can make "significant" 1436 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1437 * with a bunch of small requests. 1438 */ 1439 static void xs_tcp_write_space(struct sock *sk) 1440 { 1441 read_lock_bh(&sk->sk_callback_lock); 1442 1443 /* from net/core/stream.c:sk_stream_write_space */ 1444 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1445 xs_write_space(sk); 1446 1447 read_unlock_bh(&sk->sk_callback_lock); 1448 } 1449 1450 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1451 { 1452 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1453 struct sock *sk = transport->inet; 1454 1455 if (transport->rcvsize) { 1456 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1457 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1458 } 1459 if (transport->sndsize) { 1460 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1461 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1462 sk->sk_write_space(sk); 1463 } 1464 } 1465 1466 /** 1467 * xs_udp_set_buffer_size - set send and receive limits 1468 * @xprt: generic transport 1469 * @sndsize: requested size of send buffer, in bytes 1470 * @rcvsize: requested size of receive buffer, in bytes 1471 * 1472 * Set socket send and receive buffer size limits. 1473 */ 1474 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1475 { 1476 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1477 1478 transport->sndsize = 0; 1479 if (sndsize) 1480 transport->sndsize = sndsize + 1024; 1481 transport->rcvsize = 0; 1482 if (rcvsize) 1483 transport->rcvsize = rcvsize + 1024; 1484 1485 xs_udp_do_set_buffer_size(xprt); 1486 } 1487 1488 /** 1489 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1490 * @task: task that timed out 1491 * 1492 * Adjust the congestion window after a retransmit timeout has occurred. 1493 */ 1494 static void xs_udp_timer(struct rpc_task *task) 1495 { 1496 xprt_adjust_cwnd(task, -ETIMEDOUT); 1497 } 1498 1499 static unsigned short xs_get_random_port(void) 1500 { 1501 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1502 unsigned short rand = (unsigned short) net_random() % range; 1503 return rand + xprt_min_resvport; 1504 } 1505 1506 /** 1507 * xs_set_port - reset the port number in the remote endpoint address 1508 * @xprt: generic transport 1509 * @port: new port number 1510 * 1511 */ 1512 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1513 { 1514 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1515 1516 rpc_set_port(xs_addr(xprt), port); 1517 xs_update_peer_port(xprt); 1518 } 1519 1520 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1521 { 1522 unsigned short port = transport->srcport; 1523 1524 if (port == 0 && transport->xprt.resvport) 1525 port = xs_get_random_port(); 1526 return port; 1527 } 1528 1529 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1530 { 1531 if (transport->srcport != 0) 1532 transport->srcport = 0; 1533 if (!transport->xprt.resvport) 1534 return 0; 1535 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1536 return xprt_max_resvport; 1537 return --port; 1538 } 1539 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1540 { 1541 struct sockaddr_storage myaddr; 1542 int err, nloop = 0; 1543 unsigned short port = xs_get_srcport(transport); 1544 unsigned short last; 1545 1546 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1547 do { 1548 rpc_set_port((struct sockaddr *)&myaddr, port); 1549 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1550 transport->xprt.addrlen); 1551 if (port == 0) 1552 break; 1553 if (err == 0) { 1554 transport->srcport = port; 1555 break; 1556 } 1557 last = port; 1558 port = xs_next_srcport(transport, port); 1559 if (port > last) 1560 nloop++; 1561 } while (err == -EADDRINUSE && nloop != 2); 1562 1563 if (myaddr.ss_family == AF_INET) 1564 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1565 &((struct sockaddr_in *)&myaddr)->sin_addr, 1566 port, err ? "failed" : "ok", err); 1567 else 1568 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1569 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1570 port, err ? "failed" : "ok", err); 1571 return err; 1572 } 1573 1574 1575 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1576 static struct lock_class_key xs_key[2]; 1577 static struct lock_class_key xs_slock_key[2]; 1578 1579 static inline void xs_reclassify_socket4(struct socket *sock) 1580 { 1581 struct sock *sk = sock->sk; 1582 1583 BUG_ON(sock_owned_by_user(sk)); 1584 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1585 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1586 } 1587 1588 static inline void xs_reclassify_socket6(struct socket *sock) 1589 { 1590 struct sock *sk = sock->sk; 1591 1592 BUG_ON(sock_owned_by_user(sk)); 1593 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1594 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1595 } 1596 1597 static inline void xs_reclassify_socket(int family, struct socket *sock) 1598 { 1599 switch (family) { 1600 case AF_INET: 1601 xs_reclassify_socket4(sock); 1602 break; 1603 case AF_INET6: 1604 xs_reclassify_socket6(sock); 1605 break; 1606 } 1607 } 1608 #else 1609 static inline void xs_reclassify_socket4(struct socket *sock) 1610 { 1611 } 1612 1613 static inline void xs_reclassify_socket6(struct socket *sock) 1614 { 1615 } 1616 1617 static inline void xs_reclassify_socket(int family, struct socket *sock) 1618 { 1619 } 1620 #endif 1621 1622 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1623 struct sock_xprt *transport, int family, int type, int protocol) 1624 { 1625 struct socket *sock; 1626 int err; 1627 1628 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1629 if (err < 0) { 1630 dprintk("RPC: can't create %d transport socket (%d).\n", 1631 protocol, -err); 1632 goto out; 1633 } 1634 xs_reclassify_socket(family, sock); 1635 1636 err = xs_bind(transport, sock); 1637 if (err) { 1638 sock_release(sock); 1639 goto out; 1640 } 1641 1642 return sock; 1643 out: 1644 return ERR_PTR(err); 1645 } 1646 1647 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1648 { 1649 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1650 1651 if (!transport->inet) { 1652 struct sock *sk = sock->sk; 1653 1654 write_lock_bh(&sk->sk_callback_lock); 1655 1656 xs_save_old_callbacks(transport, sk); 1657 1658 sk->sk_user_data = xprt; 1659 sk->sk_data_ready = xs_udp_data_ready; 1660 sk->sk_write_space = xs_udp_write_space; 1661 sk->sk_error_report = xs_error_report; 1662 sk->sk_no_check = UDP_CSUM_NORCV; 1663 sk->sk_allocation = GFP_ATOMIC; 1664 1665 xprt_set_connected(xprt); 1666 1667 /* Reset to new socket */ 1668 transport->sock = sock; 1669 transport->inet = sk; 1670 1671 write_unlock_bh(&sk->sk_callback_lock); 1672 } 1673 xs_udp_do_set_buffer_size(xprt); 1674 } 1675 1676 static void xs_udp_setup_socket(struct work_struct *work) 1677 { 1678 struct sock_xprt *transport = 1679 container_of(work, struct sock_xprt, connect_worker.work); 1680 struct rpc_xprt *xprt = &transport->xprt; 1681 struct socket *sock = transport->sock; 1682 int status = -EIO; 1683 1684 if (xprt->shutdown) 1685 goto out; 1686 1687 /* Start by resetting any existing state */ 1688 xs_reset_transport(transport); 1689 sock = xs_create_sock(xprt, transport, 1690 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 1691 if (IS_ERR(sock)) 1692 goto out; 1693 1694 dprintk("RPC: worker connecting xprt %p via %s to " 1695 "%s (port %s)\n", xprt, 1696 xprt->address_strings[RPC_DISPLAY_PROTO], 1697 xprt->address_strings[RPC_DISPLAY_ADDR], 1698 xprt->address_strings[RPC_DISPLAY_PORT]); 1699 1700 xs_udp_finish_connecting(xprt, sock); 1701 status = 0; 1702 out: 1703 xprt_clear_connecting(xprt); 1704 xprt_wake_pending_tasks(xprt, status); 1705 } 1706 1707 /* 1708 * We need to preserve the port number so the reply cache on the server can 1709 * find our cached RPC replies when we get around to reconnecting. 1710 */ 1711 static void xs_abort_connection(struct sock_xprt *transport) 1712 { 1713 int result; 1714 struct sockaddr any; 1715 1716 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 1717 1718 /* 1719 * Disconnect the transport socket by doing a connect operation 1720 * with AF_UNSPEC. This should return immediately... 1721 */ 1722 memset(&any, 0, sizeof(any)); 1723 any.sa_family = AF_UNSPEC; 1724 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1725 if (!result) 1726 xs_sock_mark_closed(&transport->xprt); 1727 else 1728 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1729 result); 1730 } 1731 1732 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 1733 { 1734 unsigned int state = transport->inet->sk_state; 1735 1736 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 1737 /* we don't need to abort the connection if the socket 1738 * hasn't undergone a shutdown 1739 */ 1740 if (transport->inet->sk_shutdown == 0) 1741 return; 1742 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 1743 __func__, transport->inet->sk_shutdown); 1744 } 1745 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 1746 /* we don't need to abort the connection if the socket 1747 * hasn't undergone a shutdown 1748 */ 1749 if (transport->inet->sk_shutdown == 0) 1750 return; 1751 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 1752 "sk_shutdown set to %d\n", 1753 __func__, transport->inet->sk_shutdown); 1754 } 1755 xs_abort_connection(transport); 1756 } 1757 1758 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1759 { 1760 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1761 1762 if (!transport->inet) { 1763 struct sock *sk = sock->sk; 1764 1765 write_lock_bh(&sk->sk_callback_lock); 1766 1767 xs_save_old_callbacks(transport, sk); 1768 1769 sk->sk_user_data = xprt; 1770 sk->sk_data_ready = xs_tcp_data_ready; 1771 sk->sk_state_change = xs_tcp_state_change; 1772 sk->sk_write_space = xs_tcp_write_space; 1773 sk->sk_error_report = xs_error_report; 1774 sk->sk_allocation = GFP_ATOMIC; 1775 1776 /* socket options */ 1777 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1778 sock_reset_flag(sk, SOCK_LINGER); 1779 tcp_sk(sk)->linger2 = 0; 1780 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1781 1782 xprt_clear_connected(xprt); 1783 1784 /* Reset to new socket */ 1785 transport->sock = sock; 1786 transport->inet = sk; 1787 1788 write_unlock_bh(&sk->sk_callback_lock); 1789 } 1790 1791 if (!xprt_bound(xprt)) 1792 return -ENOTCONN; 1793 1794 /* Tell the socket layer to start connecting... */ 1795 xprt->stat.connect_count++; 1796 xprt->stat.connect_start = jiffies; 1797 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1798 } 1799 1800 /** 1801 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 1802 * @xprt: RPC transport to connect 1803 * @transport: socket transport to connect 1804 * @create_sock: function to create a socket of the correct type 1805 * 1806 * Invoked by a work queue tasklet. 1807 */ 1808 static void xs_tcp_setup_socket(struct work_struct *work) 1809 { 1810 struct sock_xprt *transport = 1811 container_of(work, struct sock_xprt, connect_worker.work); 1812 struct socket *sock = transport->sock; 1813 struct rpc_xprt *xprt = &transport->xprt; 1814 int status = -EIO; 1815 1816 if (xprt->shutdown) 1817 goto out; 1818 1819 if (!sock) { 1820 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1821 sock = xs_create_sock(xprt, transport, 1822 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 1823 if (IS_ERR(sock)) { 1824 status = PTR_ERR(sock); 1825 goto out; 1826 } 1827 } else { 1828 int abort_and_exit; 1829 1830 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 1831 &xprt->state); 1832 /* "close" the socket, preserving the local port */ 1833 xs_tcp_reuse_connection(transport); 1834 1835 if (abort_and_exit) 1836 goto out_eagain; 1837 } 1838 1839 dprintk("RPC: worker connecting xprt %p via %s to " 1840 "%s (port %s)\n", xprt, 1841 xprt->address_strings[RPC_DISPLAY_PROTO], 1842 xprt->address_strings[RPC_DISPLAY_ADDR], 1843 xprt->address_strings[RPC_DISPLAY_PORT]); 1844 1845 status = xs_tcp_finish_connecting(xprt, sock); 1846 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1847 xprt, -status, xprt_connected(xprt), 1848 sock->sk->sk_state); 1849 switch (status) { 1850 default: 1851 printk("%s: connect returned unhandled error %d\n", 1852 __func__, status); 1853 case -EADDRNOTAVAIL: 1854 /* We're probably in TIME_WAIT. Get rid of existing socket, 1855 * and retry 1856 */ 1857 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1858 xprt_force_disconnect(xprt); 1859 break; 1860 case -ECONNREFUSED: 1861 case -ECONNRESET: 1862 case -ENETUNREACH: 1863 /* retry with existing socket, after a delay */ 1864 case 0: 1865 case -EINPROGRESS: 1866 case -EALREADY: 1867 xprt_clear_connecting(xprt); 1868 return; 1869 case -EINVAL: 1870 /* Happens, for instance, if the user specified a link 1871 * local IPv6 address without a scope-id. 1872 */ 1873 goto out; 1874 } 1875 out_eagain: 1876 status = -EAGAIN; 1877 out: 1878 xprt_clear_connecting(xprt); 1879 xprt_wake_pending_tasks(xprt, status); 1880 } 1881 1882 /** 1883 * xs_connect - connect a socket to a remote endpoint 1884 * @task: address of RPC task that manages state of connect request 1885 * 1886 * TCP: If the remote end dropped the connection, delay reconnecting. 1887 * 1888 * UDP socket connects are synchronous, but we use a work queue anyway 1889 * to guarantee that even unprivileged user processes can set up a 1890 * socket on a privileged port. 1891 * 1892 * If a UDP socket connect fails, the delay behavior here prevents 1893 * retry floods (hard mounts). 1894 */ 1895 static void xs_connect(struct rpc_task *task) 1896 { 1897 struct rpc_xprt *xprt = task->tk_xprt; 1898 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1899 1900 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 1901 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1902 "seconds\n", 1903 xprt, xprt->reestablish_timeout / HZ); 1904 queue_delayed_work(rpciod_workqueue, 1905 &transport->connect_worker, 1906 xprt->reestablish_timeout); 1907 xprt->reestablish_timeout <<= 1; 1908 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1909 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1910 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1911 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1912 } else { 1913 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1914 queue_delayed_work(rpciod_workqueue, 1915 &transport->connect_worker, 0); 1916 } 1917 } 1918 1919 /** 1920 * xs_udp_print_stats - display UDP socket-specifc stats 1921 * @xprt: rpc_xprt struct containing statistics 1922 * @seq: output file 1923 * 1924 */ 1925 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1926 { 1927 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1928 1929 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1930 transport->srcport, 1931 xprt->stat.bind_count, 1932 xprt->stat.sends, 1933 xprt->stat.recvs, 1934 xprt->stat.bad_xids, 1935 xprt->stat.req_u, 1936 xprt->stat.bklog_u); 1937 } 1938 1939 /** 1940 * xs_tcp_print_stats - display TCP socket-specifc stats 1941 * @xprt: rpc_xprt struct containing statistics 1942 * @seq: output file 1943 * 1944 */ 1945 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1946 { 1947 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1948 long idle_time = 0; 1949 1950 if (xprt_connected(xprt)) 1951 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1952 1953 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1954 transport->srcport, 1955 xprt->stat.bind_count, 1956 xprt->stat.connect_count, 1957 xprt->stat.connect_time, 1958 idle_time, 1959 xprt->stat.sends, 1960 xprt->stat.recvs, 1961 xprt->stat.bad_xids, 1962 xprt->stat.req_u, 1963 xprt->stat.bklog_u); 1964 } 1965 1966 /* 1967 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 1968 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 1969 * to use the server side send routines. 1970 */ 1971 static void *bc_malloc(struct rpc_task *task, size_t size) 1972 { 1973 struct page *page; 1974 struct rpc_buffer *buf; 1975 1976 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 1977 page = alloc_page(GFP_KERNEL); 1978 1979 if (!page) 1980 return NULL; 1981 1982 buf = page_address(page); 1983 buf->len = PAGE_SIZE; 1984 1985 return buf->data; 1986 } 1987 1988 /* 1989 * Free the space allocated in the bc_alloc routine 1990 */ 1991 static void bc_free(void *buffer) 1992 { 1993 struct rpc_buffer *buf; 1994 1995 if (!buffer) 1996 return; 1997 1998 buf = container_of(buffer, struct rpc_buffer, data); 1999 free_page((unsigned long)buf); 2000 } 2001 2002 /* 2003 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2004 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2005 */ 2006 static int bc_sendto(struct rpc_rqst *req) 2007 { 2008 int len; 2009 struct xdr_buf *xbufp = &req->rq_snd_buf; 2010 struct rpc_xprt *xprt = req->rq_xprt; 2011 struct sock_xprt *transport = 2012 container_of(xprt, struct sock_xprt, xprt); 2013 struct socket *sock = transport->sock; 2014 unsigned long headoff; 2015 unsigned long tailoff; 2016 2017 /* 2018 * Set up the rpc header and record marker stuff 2019 */ 2020 xs_encode_tcp_record_marker(xbufp); 2021 2022 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2023 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2024 len = svc_send_common(sock, xbufp, 2025 virt_to_page(xbufp->head[0].iov_base), headoff, 2026 xbufp->tail[0].iov_base, tailoff); 2027 2028 if (len != xbufp->len) { 2029 printk(KERN_NOTICE "Error sending entire callback!\n"); 2030 len = -EAGAIN; 2031 } 2032 2033 return len; 2034 } 2035 2036 /* 2037 * The send routine. Borrows from svc_send 2038 */ 2039 static int bc_send_request(struct rpc_task *task) 2040 { 2041 struct rpc_rqst *req = task->tk_rqstp; 2042 struct svc_xprt *xprt; 2043 struct svc_sock *svsk; 2044 u32 len; 2045 2046 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2047 /* 2048 * Get the server socket associated with this callback xprt 2049 */ 2050 xprt = req->rq_xprt->bc_xprt; 2051 svsk = container_of(xprt, struct svc_sock, sk_xprt); 2052 2053 /* 2054 * Grab the mutex to serialize data as the connection is shared 2055 * with the fore channel 2056 */ 2057 if (!mutex_trylock(&xprt->xpt_mutex)) { 2058 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2059 if (!mutex_trylock(&xprt->xpt_mutex)) 2060 return -EAGAIN; 2061 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2062 } 2063 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2064 len = -ENOTCONN; 2065 else 2066 len = bc_sendto(req); 2067 mutex_unlock(&xprt->xpt_mutex); 2068 2069 if (len > 0) 2070 len = 0; 2071 2072 return len; 2073 } 2074 2075 /* 2076 * The close routine. Since this is client initiated, we do nothing 2077 */ 2078 2079 static void bc_close(struct rpc_xprt *xprt) 2080 { 2081 } 2082 2083 /* 2084 * The xprt destroy routine. Again, because this connection is client 2085 * initiated, we do nothing 2086 */ 2087 2088 static void bc_destroy(struct rpc_xprt *xprt) 2089 { 2090 } 2091 2092 static struct rpc_xprt_ops xs_udp_ops = { 2093 .set_buffer_size = xs_udp_set_buffer_size, 2094 .reserve_xprt = xprt_reserve_xprt_cong, 2095 .release_xprt = xprt_release_xprt_cong, 2096 .rpcbind = rpcb_getport_async, 2097 .set_port = xs_set_port, 2098 .connect = xs_connect, 2099 .buf_alloc = rpc_malloc, 2100 .buf_free = rpc_free, 2101 .send_request = xs_udp_send_request, 2102 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2103 .timer = xs_udp_timer, 2104 .release_request = xprt_release_rqst_cong, 2105 .close = xs_close, 2106 .destroy = xs_destroy, 2107 .print_stats = xs_udp_print_stats, 2108 }; 2109 2110 static struct rpc_xprt_ops xs_tcp_ops = { 2111 .reserve_xprt = xprt_reserve_xprt, 2112 .release_xprt = xs_tcp_release_xprt, 2113 .rpcbind = rpcb_getport_async, 2114 .set_port = xs_set_port, 2115 .connect = xs_connect, 2116 .buf_alloc = rpc_malloc, 2117 .buf_free = rpc_free, 2118 .send_request = xs_tcp_send_request, 2119 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2120 .close = xs_tcp_close, 2121 .destroy = xs_destroy, 2122 .print_stats = xs_tcp_print_stats, 2123 }; 2124 2125 /* 2126 * The rpc_xprt_ops for the server backchannel 2127 */ 2128 2129 static struct rpc_xprt_ops bc_tcp_ops = { 2130 .reserve_xprt = xprt_reserve_xprt, 2131 .release_xprt = xprt_release_xprt, 2132 .buf_alloc = bc_malloc, 2133 .buf_free = bc_free, 2134 .send_request = bc_send_request, 2135 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2136 .close = bc_close, 2137 .destroy = bc_destroy, 2138 .print_stats = xs_tcp_print_stats, 2139 }; 2140 2141 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2142 { 2143 static const struct sockaddr_in sin = { 2144 .sin_family = AF_INET, 2145 .sin_addr.s_addr = htonl(INADDR_ANY), 2146 }; 2147 static const struct sockaddr_in6 sin6 = { 2148 .sin6_family = AF_INET6, 2149 .sin6_addr = IN6ADDR_ANY_INIT, 2150 }; 2151 2152 switch (family) { 2153 case AF_INET: 2154 memcpy(sap, &sin, sizeof(sin)); 2155 break; 2156 case AF_INET6: 2157 memcpy(sap, &sin6, sizeof(sin6)); 2158 break; 2159 default: 2160 dprintk("RPC: %s: Bad address family\n", __func__); 2161 return -EAFNOSUPPORT; 2162 } 2163 return 0; 2164 } 2165 2166 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2167 unsigned int slot_table_size) 2168 { 2169 struct rpc_xprt *xprt; 2170 struct sock_xprt *new; 2171 2172 if (args->addrlen > sizeof(xprt->addr)) { 2173 dprintk("RPC: xs_setup_xprt: address too large\n"); 2174 return ERR_PTR(-EBADF); 2175 } 2176 2177 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size); 2178 if (xprt == NULL) { 2179 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2180 "rpc_xprt\n"); 2181 return ERR_PTR(-ENOMEM); 2182 } 2183 2184 new = container_of(xprt, struct sock_xprt, xprt); 2185 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2186 xprt->addrlen = args->addrlen; 2187 if (args->srcaddr) 2188 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2189 else { 2190 int err; 2191 err = xs_init_anyaddr(args->dstaddr->sa_family, 2192 (struct sockaddr *)&new->srcaddr); 2193 if (err != 0) 2194 return ERR_PTR(err); 2195 } 2196 2197 return xprt; 2198 } 2199 2200 static const struct rpc_timeout xs_udp_default_timeout = { 2201 .to_initval = 5 * HZ, 2202 .to_maxval = 30 * HZ, 2203 .to_increment = 5 * HZ, 2204 .to_retries = 5, 2205 }; 2206 2207 /** 2208 * xs_setup_udp - Set up transport to use a UDP socket 2209 * @args: rpc transport creation arguments 2210 * 2211 */ 2212 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2213 { 2214 struct sockaddr *addr = args->dstaddr; 2215 struct rpc_xprt *xprt; 2216 struct sock_xprt *transport; 2217 struct rpc_xprt *ret; 2218 2219 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 2220 if (IS_ERR(xprt)) 2221 return xprt; 2222 transport = container_of(xprt, struct sock_xprt, xprt); 2223 2224 xprt->prot = IPPROTO_UDP; 2225 xprt->tsh_size = 0; 2226 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2227 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2228 2229 xprt->bind_timeout = XS_BIND_TO; 2230 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2231 xprt->idle_timeout = XS_IDLE_DISC_TO; 2232 2233 xprt->ops = &xs_udp_ops; 2234 2235 xprt->timeout = &xs_udp_default_timeout; 2236 2237 switch (addr->sa_family) { 2238 case AF_INET: 2239 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2240 xprt_set_bound(xprt); 2241 2242 INIT_DELAYED_WORK(&transport->connect_worker, 2243 xs_udp_setup_socket); 2244 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2245 break; 2246 case AF_INET6: 2247 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2248 xprt_set_bound(xprt); 2249 2250 INIT_DELAYED_WORK(&transport->connect_worker, 2251 xs_udp_setup_socket); 2252 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2253 break; 2254 default: 2255 ret = ERR_PTR(-EAFNOSUPPORT); 2256 goto out_err; 2257 } 2258 2259 if (xprt_bound(xprt)) 2260 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2261 xprt->address_strings[RPC_DISPLAY_ADDR], 2262 xprt->address_strings[RPC_DISPLAY_PORT], 2263 xprt->address_strings[RPC_DISPLAY_PROTO]); 2264 else 2265 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2266 xprt->address_strings[RPC_DISPLAY_ADDR], 2267 xprt->address_strings[RPC_DISPLAY_PROTO]); 2268 2269 if (try_module_get(THIS_MODULE)) 2270 return xprt; 2271 ret = ERR_PTR(-EINVAL); 2272 out_err: 2273 xprt_free(xprt); 2274 return ret; 2275 } 2276 2277 static const struct rpc_timeout xs_tcp_default_timeout = { 2278 .to_initval = 60 * HZ, 2279 .to_maxval = 60 * HZ, 2280 .to_retries = 2, 2281 }; 2282 2283 /** 2284 * xs_setup_tcp - Set up transport to use a TCP socket 2285 * @args: rpc transport creation arguments 2286 * 2287 */ 2288 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2289 { 2290 struct sockaddr *addr = args->dstaddr; 2291 struct rpc_xprt *xprt; 2292 struct sock_xprt *transport; 2293 struct rpc_xprt *ret; 2294 2295 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2296 if (IS_ERR(xprt)) 2297 return xprt; 2298 transport = container_of(xprt, struct sock_xprt, xprt); 2299 2300 xprt->prot = IPPROTO_TCP; 2301 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2302 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2303 2304 xprt->bind_timeout = XS_BIND_TO; 2305 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2306 xprt->idle_timeout = XS_IDLE_DISC_TO; 2307 2308 xprt->ops = &xs_tcp_ops; 2309 xprt->timeout = &xs_tcp_default_timeout; 2310 2311 switch (addr->sa_family) { 2312 case AF_INET: 2313 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2314 xprt_set_bound(xprt); 2315 2316 INIT_DELAYED_WORK(&transport->connect_worker, 2317 xs_tcp_setup_socket); 2318 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2319 break; 2320 case AF_INET6: 2321 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2322 xprt_set_bound(xprt); 2323 2324 INIT_DELAYED_WORK(&transport->connect_worker, 2325 xs_tcp_setup_socket); 2326 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2327 break; 2328 default: 2329 ret = ERR_PTR(-EAFNOSUPPORT); 2330 goto out_err; 2331 } 2332 2333 if (xprt_bound(xprt)) 2334 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2335 xprt->address_strings[RPC_DISPLAY_ADDR], 2336 xprt->address_strings[RPC_DISPLAY_PORT], 2337 xprt->address_strings[RPC_DISPLAY_PROTO]); 2338 else 2339 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2340 xprt->address_strings[RPC_DISPLAY_ADDR], 2341 xprt->address_strings[RPC_DISPLAY_PROTO]); 2342 2343 2344 if (try_module_get(THIS_MODULE)) 2345 return xprt; 2346 ret = ERR_PTR(-EINVAL); 2347 out_err: 2348 xprt_free(xprt); 2349 return ret; 2350 } 2351 2352 /** 2353 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2354 * @args: rpc transport creation arguments 2355 * 2356 */ 2357 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2358 { 2359 struct sockaddr *addr = args->dstaddr; 2360 struct rpc_xprt *xprt; 2361 struct sock_xprt *transport; 2362 struct svc_sock *bc_sock; 2363 struct rpc_xprt *ret; 2364 2365 if (args->bc_xprt->xpt_bc_xprt) { 2366 /* 2367 * This server connection already has a backchannel 2368 * export; we can't create a new one, as we wouldn't be 2369 * able to match replies based on xid any more. So, 2370 * reuse the already-existing one: 2371 */ 2372 return args->bc_xprt->xpt_bc_xprt; 2373 } 2374 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2375 if (IS_ERR(xprt)) 2376 return xprt; 2377 transport = container_of(xprt, struct sock_xprt, xprt); 2378 2379 xprt->prot = IPPROTO_TCP; 2380 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2381 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2382 xprt->timeout = &xs_tcp_default_timeout; 2383 2384 /* backchannel */ 2385 xprt_set_bound(xprt); 2386 xprt->bind_timeout = 0; 2387 xprt->reestablish_timeout = 0; 2388 xprt->idle_timeout = 0; 2389 2390 xprt->ops = &bc_tcp_ops; 2391 2392 switch (addr->sa_family) { 2393 case AF_INET: 2394 xs_format_peer_addresses(xprt, "tcp", 2395 RPCBIND_NETID_TCP); 2396 break; 2397 case AF_INET6: 2398 xs_format_peer_addresses(xprt, "tcp", 2399 RPCBIND_NETID_TCP6); 2400 break; 2401 default: 2402 ret = ERR_PTR(-EAFNOSUPPORT); 2403 goto out_err; 2404 } 2405 2406 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2407 xprt->address_strings[RPC_DISPLAY_ADDR], 2408 xprt->address_strings[RPC_DISPLAY_PORT], 2409 xprt->address_strings[RPC_DISPLAY_PROTO]); 2410 2411 /* 2412 * Once we've associated a backchannel xprt with a connection, 2413 * we want to keep it around as long as long as the connection 2414 * lasts, in case we need to start using it for a backchannel 2415 * again; this reference won't be dropped until bc_xprt is 2416 * destroyed. 2417 */ 2418 xprt_get(xprt); 2419 args->bc_xprt->xpt_bc_xprt = xprt; 2420 xprt->bc_xprt = args->bc_xprt; 2421 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2422 transport->sock = bc_sock->sk_sock; 2423 transport->inet = bc_sock->sk_sk; 2424 2425 /* 2426 * Since we don't want connections for the backchannel, we set 2427 * the xprt status to connected 2428 */ 2429 xprt_set_connected(xprt); 2430 2431 2432 if (try_module_get(THIS_MODULE)) 2433 return xprt; 2434 xprt_put(xprt); 2435 ret = ERR_PTR(-EINVAL); 2436 out_err: 2437 xprt_free(xprt); 2438 return ret; 2439 } 2440 2441 static struct xprt_class xs_udp_transport = { 2442 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2443 .name = "udp", 2444 .owner = THIS_MODULE, 2445 .ident = XPRT_TRANSPORT_UDP, 2446 .setup = xs_setup_udp, 2447 }; 2448 2449 static struct xprt_class xs_tcp_transport = { 2450 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2451 .name = "tcp", 2452 .owner = THIS_MODULE, 2453 .ident = XPRT_TRANSPORT_TCP, 2454 .setup = xs_setup_tcp, 2455 }; 2456 2457 static struct xprt_class xs_bc_tcp_transport = { 2458 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2459 .name = "tcp NFSv4.1 backchannel", 2460 .owner = THIS_MODULE, 2461 .ident = XPRT_TRANSPORT_BC_TCP, 2462 .setup = xs_setup_bc_tcp, 2463 }; 2464 2465 /** 2466 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2467 * 2468 */ 2469 int init_socket_xprt(void) 2470 { 2471 #ifdef RPC_DEBUG 2472 if (!sunrpc_table_header) 2473 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2474 #endif 2475 2476 xprt_register_transport(&xs_udp_transport); 2477 xprt_register_transport(&xs_tcp_transport); 2478 xprt_register_transport(&xs_bc_tcp_transport); 2479 2480 return 0; 2481 } 2482 2483 /** 2484 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2485 * 2486 */ 2487 void cleanup_socket_xprt(void) 2488 { 2489 #ifdef RPC_DEBUG 2490 if (sunrpc_table_header) { 2491 unregister_sysctl_table(sunrpc_table_header); 2492 sunrpc_table_header = NULL; 2493 } 2494 #endif 2495 2496 xprt_unregister_transport(&xs_udp_transport); 2497 xprt_unregister_transport(&xs_tcp_transport); 2498 xprt_unregister_transport(&xs_bc_tcp_transport); 2499 } 2500 2501 static int param_set_uint_minmax(const char *val, 2502 const struct kernel_param *kp, 2503 unsigned int min, unsigned int max) 2504 { 2505 unsigned long num; 2506 int ret; 2507 2508 if (!val) 2509 return -EINVAL; 2510 ret = strict_strtoul(val, 0, &num); 2511 if (ret == -EINVAL || num < min || num > max) 2512 return -EINVAL; 2513 *((unsigned int *)kp->arg) = num; 2514 return 0; 2515 } 2516 2517 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2518 { 2519 return param_set_uint_minmax(val, kp, 2520 RPC_MIN_RESVPORT, 2521 RPC_MAX_RESVPORT); 2522 } 2523 2524 static struct kernel_param_ops param_ops_portnr = { 2525 .set = param_set_portnr, 2526 .get = param_get_uint, 2527 }; 2528 2529 #define param_check_portnr(name, p) \ 2530 __param_check(name, p, unsigned int); 2531 2532 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 2533 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 2534 2535 static int param_set_slot_table_size(const char *val, 2536 const struct kernel_param *kp) 2537 { 2538 return param_set_uint_minmax(val, kp, 2539 RPC_MIN_SLOT_TABLE, 2540 RPC_MAX_SLOT_TABLE); 2541 } 2542 2543 static struct kernel_param_ops param_ops_slot_table_size = { 2544 .set = param_set_slot_table_size, 2545 .get = param_get_uint, 2546 }; 2547 2548 #define param_check_slot_table_size(name, p) \ 2549 __param_check(name, p, unsigned int); 2550 2551 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 2552 slot_table_size, 0644); 2553 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 2554 slot_table_size, 0644); 2555 2556