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