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/xprtsock.h> 36 #include <linux/file.h> 37 38 #include <net/sock.h> 39 #include <net/checksum.h> 40 #include <net/udp.h> 41 #include <net/tcp.h> 42 43 /* 44 * xprtsock tunables 45 */ 46 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 47 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; 48 49 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 50 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 51 52 /* 53 * We can register our own files under /proc/sys/sunrpc by 54 * calling register_sysctl_table() again. The files in that 55 * directory become the union of all files registered there. 56 * 57 * We simply need to make sure that we don't collide with 58 * someone else's file names! 59 */ 60 61 #ifdef RPC_DEBUG 62 63 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 64 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 65 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 66 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 67 68 static struct ctl_table_header *sunrpc_table_header; 69 70 /* 71 * FIXME: changing the UDP slot table size should also resize the UDP 72 * socket buffers for existing UDP transports 73 */ 74 static ctl_table xs_tunables_table[] = { 75 { 76 .ctl_name = CTL_SLOTTABLE_UDP, 77 .procname = "udp_slot_table_entries", 78 .data = &xprt_udp_slot_table_entries, 79 .maxlen = sizeof(unsigned int), 80 .mode = 0644, 81 .proc_handler = &proc_dointvec_minmax, 82 .strategy = &sysctl_intvec, 83 .extra1 = &min_slot_table_size, 84 .extra2 = &max_slot_table_size 85 }, 86 { 87 .ctl_name = CTL_SLOTTABLE_TCP, 88 .procname = "tcp_slot_table_entries", 89 .data = &xprt_tcp_slot_table_entries, 90 .maxlen = sizeof(unsigned int), 91 .mode = 0644, 92 .proc_handler = &proc_dointvec_minmax, 93 .strategy = &sysctl_intvec, 94 .extra1 = &min_slot_table_size, 95 .extra2 = &max_slot_table_size 96 }, 97 { 98 .ctl_name = CTL_MIN_RESVPORT, 99 .procname = "min_resvport", 100 .data = &xprt_min_resvport, 101 .maxlen = sizeof(unsigned int), 102 .mode = 0644, 103 .proc_handler = &proc_dointvec_minmax, 104 .strategy = &sysctl_intvec, 105 .extra1 = &xprt_min_resvport_limit, 106 .extra2 = &xprt_max_resvport_limit 107 }, 108 { 109 .ctl_name = CTL_MAX_RESVPORT, 110 .procname = "max_resvport", 111 .data = &xprt_max_resvport, 112 .maxlen = sizeof(unsigned int), 113 .mode = 0644, 114 .proc_handler = &proc_dointvec_minmax, 115 .strategy = &sysctl_intvec, 116 .extra1 = &xprt_min_resvport_limit, 117 .extra2 = &xprt_max_resvport_limit 118 }, 119 { 120 .ctl_name = 0, 121 }, 122 }; 123 124 static ctl_table sunrpc_table[] = { 125 { 126 .ctl_name = CTL_SUNRPC, 127 .procname = "sunrpc", 128 .mode = 0555, 129 .child = xs_tunables_table 130 }, 131 { 132 .ctl_name = 0, 133 }, 134 }; 135 136 #endif 137 138 /* 139 * Time out for an RPC UDP socket connect. UDP socket connects are 140 * synchronous, but we set a timeout anyway in case of resource 141 * exhaustion on the local host. 142 */ 143 #define XS_UDP_CONN_TO (5U * HZ) 144 145 /* 146 * Wait duration for an RPC TCP connection to be established. Solaris 147 * NFS over TCP uses 60 seconds, for example, which is in line with how 148 * long a server takes to reboot. 149 */ 150 #define XS_TCP_CONN_TO (60U * HZ) 151 152 /* 153 * Wait duration for a reply from the RPC portmapper. 154 */ 155 #define XS_BIND_TO (60U * HZ) 156 157 /* 158 * Delay if a UDP socket connect error occurs. This is most likely some 159 * kind of resource problem on the local host. 160 */ 161 #define XS_UDP_REEST_TO (2U * HZ) 162 163 /* 164 * The reestablish timeout allows clients to delay for a bit before attempting 165 * to reconnect to a server that just dropped our connection. 166 * 167 * We implement an exponential backoff when trying to reestablish a TCP 168 * transport connection with the server. Some servers like to drop a TCP 169 * connection when they are overworked, so we start with a short timeout and 170 * increase over time if the server is down or not responding. 171 */ 172 #define XS_TCP_INIT_REEST_TO (3U * HZ) 173 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 174 175 /* 176 * TCP idle timeout; client drops the transport socket if it is idle 177 * for this long. Note that we also timeout UDP sockets to prevent 178 * holding port numbers when there is no RPC traffic. 179 */ 180 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 181 182 #ifdef RPC_DEBUG 183 # undef RPC_DEBUG_DATA 184 # define RPCDBG_FACILITY RPCDBG_TRANS 185 #endif 186 187 #ifdef RPC_DEBUG_DATA 188 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 189 { 190 u8 *buf = (u8 *) packet; 191 int j; 192 193 dprintk("RPC: %s\n", msg); 194 for (j = 0; j < count && j < 128; j += 4) { 195 if (!(j & 31)) { 196 if (j) 197 dprintk("\n"); 198 dprintk("0x%04x ", j); 199 } 200 dprintk("%02x%02x%02x%02x ", 201 buf[j], buf[j+1], buf[j+2], buf[j+3]); 202 } 203 dprintk("\n"); 204 } 205 #else 206 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 207 { 208 /* NOP */ 209 } 210 #endif 211 212 struct sock_xprt { 213 struct rpc_xprt xprt; 214 215 /* 216 * Network layer 217 */ 218 struct socket * sock; 219 struct sock * inet; 220 221 /* 222 * State of TCP reply receive 223 */ 224 __be32 tcp_fraghdr, 225 tcp_xid; 226 227 u32 tcp_offset, 228 tcp_reclen; 229 230 unsigned long tcp_copied, 231 tcp_flags; 232 233 /* 234 * Connection of transports 235 */ 236 struct delayed_work connect_worker; 237 struct sockaddr_storage addr; 238 unsigned short port; 239 240 /* 241 * UDP socket buffer size parameters 242 */ 243 size_t rcvsize, 244 sndsize; 245 246 /* 247 * Saved socket callback addresses 248 */ 249 void (*old_data_ready)(struct sock *, int); 250 void (*old_state_change)(struct sock *); 251 void (*old_write_space)(struct sock *); 252 void (*old_error_report)(struct sock *); 253 }; 254 255 /* 256 * TCP receive state flags 257 */ 258 #define TCP_RCV_LAST_FRAG (1UL << 0) 259 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 260 #define TCP_RCV_COPY_XID (1UL << 2) 261 #define TCP_RCV_COPY_DATA (1UL << 3) 262 263 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 264 { 265 return (struct sockaddr *) &xprt->addr; 266 } 267 268 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 269 { 270 return (struct sockaddr_in *) &xprt->addr; 271 } 272 273 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 274 { 275 return (struct sockaddr_in6 *) &xprt->addr; 276 } 277 278 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt, 279 const char *protocol, 280 const char *netid) 281 { 282 struct sockaddr_in *addr = xs_addr_in(xprt); 283 char *buf; 284 285 buf = kzalloc(20, GFP_KERNEL); 286 if (buf) { 287 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr); 288 } 289 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 290 291 buf = kzalloc(8, GFP_KERNEL); 292 if (buf) { 293 snprintf(buf, 8, "%u", 294 ntohs(addr->sin_port)); 295 } 296 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 297 298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 299 300 buf = kzalloc(48, GFP_KERNEL); 301 if (buf) { 302 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s", 303 &addr->sin_addr.s_addr, 304 ntohs(addr->sin_port), 305 protocol); 306 } 307 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 308 309 buf = kzalloc(10, GFP_KERNEL); 310 if (buf) { 311 snprintf(buf, 10, "%02x%02x%02x%02x", 312 NIPQUAD(addr->sin_addr.s_addr)); 313 } 314 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 315 316 buf = kzalloc(8, GFP_KERNEL); 317 if (buf) { 318 snprintf(buf, 8, "%4hx", 319 ntohs(addr->sin_port)); 320 } 321 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 322 323 buf = kzalloc(30, GFP_KERNEL); 324 if (buf) { 325 snprintf(buf, 30, "%pI4.%u.%u", 326 &addr->sin_addr.s_addr, 327 ntohs(addr->sin_port) >> 8, 328 ntohs(addr->sin_port) & 0xff); 329 } 330 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 331 332 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 333 } 334 335 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, 336 const char *protocol, 337 const char *netid) 338 { 339 struct sockaddr_in6 *addr = xs_addr_in6(xprt); 340 char *buf; 341 342 buf = kzalloc(40, GFP_KERNEL); 343 if (buf) { 344 snprintf(buf, 40, "%pI6",&addr->sin6_addr); 345 } 346 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 347 348 buf = kzalloc(8, GFP_KERNEL); 349 if (buf) { 350 snprintf(buf, 8, "%u", 351 ntohs(addr->sin6_port)); 352 } 353 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 354 355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 356 357 buf = kzalloc(64, GFP_KERNEL); 358 if (buf) { 359 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s", 360 &addr->sin6_addr, 361 ntohs(addr->sin6_port), 362 protocol); 363 } 364 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 365 366 buf = kzalloc(36, GFP_KERNEL); 367 if (buf) 368 snprintf(buf, 36, "%pi6", &addr->sin6_addr); 369 370 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 371 372 buf = kzalloc(8, GFP_KERNEL); 373 if (buf) { 374 snprintf(buf, 8, "%4hx", 375 ntohs(addr->sin6_port)); 376 } 377 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 378 379 buf = kzalloc(50, GFP_KERNEL); 380 if (buf) { 381 snprintf(buf, 50, "%pI6.%u.%u", 382 &addr->sin6_addr, 383 ntohs(addr->sin6_port) >> 8, 384 ntohs(addr->sin6_port) & 0xff); 385 } 386 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 387 388 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 389 } 390 391 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 392 { 393 unsigned int i; 394 395 for (i = 0; i < RPC_DISPLAY_MAX; i++) 396 switch (i) { 397 case RPC_DISPLAY_PROTO: 398 case RPC_DISPLAY_NETID: 399 continue; 400 default: 401 kfree(xprt->address_strings[i]); 402 } 403 } 404 405 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 406 407 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 408 { 409 struct msghdr msg = { 410 .msg_name = addr, 411 .msg_namelen = addrlen, 412 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 413 }; 414 struct kvec iov = { 415 .iov_base = vec->iov_base + base, 416 .iov_len = vec->iov_len - base, 417 }; 418 419 if (iov.iov_len != 0) 420 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 421 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 422 } 423 424 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 425 { 426 struct page **ppage; 427 unsigned int remainder; 428 int err, sent = 0; 429 430 remainder = xdr->page_len - base; 431 base += xdr->page_base; 432 ppage = xdr->pages + (base >> PAGE_SHIFT); 433 base &= ~PAGE_MASK; 434 for(;;) { 435 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 436 int flags = XS_SENDMSG_FLAGS; 437 438 remainder -= len; 439 if (remainder != 0 || more) 440 flags |= MSG_MORE; 441 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 442 if (remainder == 0 || err != len) 443 break; 444 sent += err; 445 ppage++; 446 base = 0; 447 } 448 if (sent == 0) 449 return err; 450 if (err > 0) 451 sent += err; 452 return sent; 453 } 454 455 /** 456 * xs_sendpages - write pages directly to a socket 457 * @sock: socket to send on 458 * @addr: UDP only -- address of destination 459 * @addrlen: UDP only -- length of destination address 460 * @xdr: buffer containing this request 461 * @base: starting position in the buffer 462 * 463 */ 464 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 465 { 466 unsigned int remainder = xdr->len - base; 467 int err, sent = 0; 468 469 if (unlikely(!sock)) 470 return -ENOTSOCK; 471 472 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 473 if (base != 0) { 474 addr = NULL; 475 addrlen = 0; 476 } 477 478 if (base < xdr->head[0].iov_len || addr != NULL) { 479 unsigned int len = xdr->head[0].iov_len - base; 480 remainder -= len; 481 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 482 if (remainder == 0 || err != len) 483 goto out; 484 sent += err; 485 base = 0; 486 } else 487 base -= xdr->head[0].iov_len; 488 489 if (base < xdr->page_len) { 490 unsigned int len = xdr->page_len - base; 491 remainder -= len; 492 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 493 if (remainder == 0 || err != len) 494 goto out; 495 sent += err; 496 base = 0; 497 } else 498 base -= xdr->page_len; 499 500 if (base >= xdr->tail[0].iov_len) 501 return sent; 502 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 503 out: 504 if (sent == 0) 505 return err; 506 if (err > 0) 507 sent += err; 508 return sent; 509 } 510 511 static void xs_nospace_callback(struct rpc_task *task) 512 { 513 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 514 515 transport->inet->sk_write_pending--; 516 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 517 } 518 519 /** 520 * xs_nospace - place task on wait queue if transmit was incomplete 521 * @task: task to put to sleep 522 * 523 */ 524 static void xs_nospace(struct rpc_task *task) 525 { 526 struct rpc_rqst *req = task->tk_rqstp; 527 struct rpc_xprt *xprt = req->rq_xprt; 528 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 529 530 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 531 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 532 req->rq_slen); 533 534 /* Protect against races with write_space */ 535 spin_lock_bh(&xprt->transport_lock); 536 537 /* Don't race with disconnect */ 538 if (xprt_connected(xprt)) { 539 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 540 /* 541 * Notify TCP that we're limited by the application 542 * window size 543 */ 544 set_bit(SOCK_NOSPACE, &transport->sock->flags); 545 transport->inet->sk_write_pending++; 546 /* ...and wait for more buffer space */ 547 xprt_wait_for_buffer_space(task, xs_nospace_callback); 548 } 549 } else { 550 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 551 task->tk_status = -ENOTCONN; 552 } 553 554 spin_unlock_bh(&xprt->transport_lock); 555 } 556 557 /** 558 * xs_udp_send_request - write an RPC request to a UDP socket 559 * @task: address of RPC task that manages the state of an RPC request 560 * 561 * Return values: 562 * 0: The request has been sent 563 * EAGAIN: The socket was blocked, please call again later to 564 * complete the request 565 * ENOTCONN: Caller needs to invoke connect logic then call again 566 * other: Some other error occured, the request was not sent 567 */ 568 static int xs_udp_send_request(struct rpc_task *task) 569 { 570 struct rpc_rqst *req = task->tk_rqstp; 571 struct rpc_xprt *xprt = req->rq_xprt; 572 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 573 struct xdr_buf *xdr = &req->rq_snd_buf; 574 int status; 575 576 xs_pktdump("packet data:", 577 req->rq_svec->iov_base, 578 req->rq_svec->iov_len); 579 580 if (!xprt_bound(xprt)) 581 return -ENOTCONN; 582 status = xs_sendpages(transport->sock, 583 xs_addr(xprt), 584 xprt->addrlen, xdr, 585 req->rq_bytes_sent); 586 587 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 588 xdr->len - req->rq_bytes_sent, status); 589 590 if (status >= 0) { 591 task->tk_bytes_sent += status; 592 if (status >= req->rq_slen) 593 return 0; 594 /* Still some bytes left; set up for a retry later. */ 595 status = -EAGAIN; 596 } 597 598 switch (status) { 599 case -ENOTSOCK: 600 status = -ENOTCONN; 601 /* Should we call xs_close() here? */ 602 break; 603 case -EAGAIN: 604 xs_nospace(task); 605 break; 606 case -ENETUNREACH: 607 case -EPIPE: 608 case -ECONNREFUSED: 609 /* When the server has died, an ICMP port unreachable message 610 * prompts ECONNREFUSED. */ 611 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 612 break; 613 default: 614 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 615 dprintk("RPC: sendmsg returned unrecognized error %d\n", 616 -status); 617 } 618 619 return status; 620 } 621 622 /** 623 * xs_tcp_shutdown - gracefully shut down a TCP socket 624 * @xprt: transport 625 * 626 * Initiates a graceful shutdown of the TCP socket by calling the 627 * equivalent of shutdown(SHUT_WR); 628 */ 629 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 630 { 631 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 632 struct socket *sock = transport->sock; 633 634 if (sock != NULL) 635 kernel_sock_shutdown(sock, SHUT_WR); 636 } 637 638 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 639 { 640 u32 reclen = buf->len - sizeof(rpc_fraghdr); 641 rpc_fraghdr *base = buf->head[0].iov_base; 642 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 643 } 644 645 /** 646 * xs_tcp_send_request - write an RPC request to a TCP socket 647 * @task: address of RPC task that manages the state of an RPC request 648 * 649 * Return values: 650 * 0: The request has been sent 651 * EAGAIN: The socket was blocked, please call again later to 652 * complete the request 653 * ENOTCONN: Caller needs to invoke connect logic then call again 654 * other: Some other error occured, the request was not sent 655 * 656 * XXX: In the case of soft timeouts, should we eventually give up 657 * if sendmsg is not able to make progress? 658 */ 659 static int xs_tcp_send_request(struct rpc_task *task) 660 { 661 struct rpc_rqst *req = task->tk_rqstp; 662 struct rpc_xprt *xprt = req->rq_xprt; 663 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 664 struct xdr_buf *xdr = &req->rq_snd_buf; 665 int status; 666 667 xs_encode_tcp_record_marker(&req->rq_snd_buf); 668 669 xs_pktdump("packet data:", 670 req->rq_svec->iov_base, 671 req->rq_svec->iov_len); 672 673 /* Continue transmitting the packet/record. We must be careful 674 * to cope with writespace callbacks arriving _after_ we have 675 * called sendmsg(). */ 676 while (1) { 677 status = xs_sendpages(transport->sock, 678 NULL, 0, xdr, req->rq_bytes_sent); 679 680 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 681 xdr->len - req->rq_bytes_sent, status); 682 683 if (unlikely(status < 0)) 684 break; 685 686 /* If we've sent the entire packet, immediately 687 * reset the count of bytes sent. */ 688 req->rq_bytes_sent += status; 689 task->tk_bytes_sent += status; 690 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 691 req->rq_bytes_sent = 0; 692 return 0; 693 } 694 695 if (status != 0) 696 continue; 697 status = -EAGAIN; 698 break; 699 } 700 701 switch (status) { 702 case -ENOTSOCK: 703 status = -ENOTCONN; 704 /* Should we call xs_close() here? */ 705 break; 706 case -EAGAIN: 707 xs_nospace(task); 708 break; 709 case -ECONNRESET: 710 xs_tcp_shutdown(xprt); 711 case -ECONNREFUSED: 712 case -ENOTCONN: 713 case -EPIPE: 714 status = -ENOTCONN; 715 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 716 break; 717 default: 718 dprintk("RPC: sendmsg returned unrecognized error %d\n", 719 -status); 720 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 721 xs_tcp_shutdown(xprt); 722 } 723 724 return status; 725 } 726 727 /** 728 * xs_tcp_release_xprt - clean up after a tcp transmission 729 * @xprt: transport 730 * @task: rpc task 731 * 732 * This cleans up if an error causes us to abort the transmission of a request. 733 * In this case, the socket may need to be reset in order to avoid confusing 734 * the server. 735 */ 736 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 737 { 738 struct rpc_rqst *req; 739 740 if (task != xprt->snd_task) 741 return; 742 if (task == NULL) 743 goto out_release; 744 req = task->tk_rqstp; 745 if (req->rq_bytes_sent == 0) 746 goto out_release; 747 if (req->rq_bytes_sent == req->rq_snd_buf.len) 748 goto out_release; 749 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 750 out_release: 751 xprt_release_xprt(xprt, task); 752 } 753 754 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 755 { 756 transport->old_data_ready = sk->sk_data_ready; 757 transport->old_state_change = sk->sk_state_change; 758 transport->old_write_space = sk->sk_write_space; 759 transport->old_error_report = sk->sk_error_report; 760 } 761 762 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 763 { 764 sk->sk_data_ready = transport->old_data_ready; 765 sk->sk_state_change = transport->old_state_change; 766 sk->sk_write_space = transport->old_write_space; 767 sk->sk_error_report = transport->old_error_report; 768 } 769 770 /** 771 * xs_close - close a socket 772 * @xprt: transport 773 * 774 * This is used when all requests are complete; ie, no DRC state remains 775 * on the server we want to save. 776 */ 777 static void xs_close(struct rpc_xprt *xprt) 778 { 779 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 780 struct socket *sock = transport->sock; 781 struct sock *sk = transport->inet; 782 783 if (!sk) 784 goto clear_close_wait; 785 786 dprintk("RPC: xs_close xprt %p\n", xprt); 787 788 write_lock_bh(&sk->sk_callback_lock); 789 transport->inet = NULL; 790 transport->sock = NULL; 791 792 sk->sk_user_data = NULL; 793 794 xs_restore_old_callbacks(transport, sk); 795 write_unlock_bh(&sk->sk_callback_lock); 796 797 sk->sk_no_check = 0; 798 799 sock_release(sock); 800 clear_close_wait: 801 smp_mb__before_clear_bit(); 802 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 803 clear_bit(XPRT_CLOSING, &xprt->state); 804 smp_mb__after_clear_bit(); 805 xprt_disconnect_done(xprt); 806 } 807 808 /** 809 * xs_destroy - prepare to shutdown a transport 810 * @xprt: doomed transport 811 * 812 */ 813 static void xs_destroy(struct rpc_xprt *xprt) 814 { 815 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 816 817 dprintk("RPC: xs_destroy xprt %p\n", xprt); 818 819 cancel_rearming_delayed_work(&transport->connect_worker); 820 821 xs_close(xprt); 822 xs_free_peer_addresses(xprt); 823 kfree(xprt->slot); 824 kfree(xprt); 825 module_put(THIS_MODULE); 826 } 827 828 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 829 { 830 return (struct rpc_xprt *) sk->sk_user_data; 831 } 832 833 /** 834 * xs_udp_data_ready - "data ready" callback for UDP sockets 835 * @sk: socket with data to read 836 * @len: how much data to read 837 * 838 */ 839 static void xs_udp_data_ready(struct sock *sk, int len) 840 { 841 struct rpc_task *task; 842 struct rpc_xprt *xprt; 843 struct rpc_rqst *rovr; 844 struct sk_buff *skb; 845 int err, repsize, copied; 846 u32 _xid; 847 __be32 *xp; 848 849 read_lock(&sk->sk_callback_lock); 850 dprintk("RPC: xs_udp_data_ready...\n"); 851 if (!(xprt = xprt_from_sock(sk))) 852 goto out; 853 854 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 855 goto out; 856 857 if (xprt->shutdown) 858 goto dropit; 859 860 repsize = skb->len - sizeof(struct udphdr); 861 if (repsize < 4) { 862 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 863 goto dropit; 864 } 865 866 /* Copy the XID from the skb... */ 867 xp = skb_header_pointer(skb, sizeof(struct udphdr), 868 sizeof(_xid), &_xid); 869 if (xp == NULL) 870 goto dropit; 871 872 /* Look up and lock the request corresponding to the given XID */ 873 spin_lock(&xprt->transport_lock); 874 rovr = xprt_lookup_rqst(xprt, *xp); 875 if (!rovr) 876 goto out_unlock; 877 task = rovr->rq_task; 878 879 if ((copied = rovr->rq_private_buf.buflen) > repsize) 880 copied = repsize; 881 882 /* Suck it into the iovec, verify checksum if not done by hw. */ 883 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 884 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 885 goto out_unlock; 886 } 887 888 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 889 890 /* Something worked... */ 891 dst_confirm(skb->dst); 892 893 xprt_adjust_cwnd(task, copied); 894 xprt_update_rtt(task); 895 xprt_complete_rqst(task, copied); 896 897 out_unlock: 898 spin_unlock(&xprt->transport_lock); 899 dropit: 900 skb_free_datagram(sk, skb); 901 out: 902 read_unlock(&sk->sk_callback_lock); 903 } 904 905 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 906 { 907 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 908 size_t len, used; 909 char *p; 910 911 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 912 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 913 used = xdr_skb_read_bits(desc, p, len); 914 transport->tcp_offset += used; 915 if (used != len) 916 return; 917 918 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 919 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 920 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 921 else 922 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 923 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 924 925 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 926 transport->tcp_offset = 0; 927 928 /* Sanity check of the record length */ 929 if (unlikely(transport->tcp_reclen < 4)) { 930 dprintk("RPC: invalid TCP record fragment length\n"); 931 xprt_force_disconnect(xprt); 932 return; 933 } 934 dprintk("RPC: reading TCP record fragment of length %d\n", 935 transport->tcp_reclen); 936 } 937 938 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 939 { 940 if (transport->tcp_offset == transport->tcp_reclen) { 941 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 942 transport->tcp_offset = 0; 943 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 944 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 945 transport->tcp_flags |= TCP_RCV_COPY_XID; 946 transport->tcp_copied = 0; 947 } 948 } 949 } 950 951 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 952 { 953 size_t len, used; 954 char *p; 955 956 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 957 dprintk("RPC: reading XID (%Zu bytes)\n", len); 958 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 959 used = xdr_skb_read_bits(desc, p, len); 960 transport->tcp_offset += used; 961 if (used != len) 962 return; 963 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 964 transport->tcp_flags |= TCP_RCV_COPY_DATA; 965 transport->tcp_copied = 4; 966 dprintk("RPC: reading reply for XID %08x\n", 967 ntohl(transport->tcp_xid)); 968 xs_tcp_check_fraghdr(transport); 969 } 970 971 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 972 { 973 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 974 struct rpc_rqst *req; 975 struct xdr_buf *rcvbuf; 976 size_t len; 977 ssize_t r; 978 979 /* Find and lock the request corresponding to this xid */ 980 spin_lock(&xprt->transport_lock); 981 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 982 if (!req) { 983 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 984 dprintk("RPC: XID %08x request not found!\n", 985 ntohl(transport->tcp_xid)); 986 spin_unlock(&xprt->transport_lock); 987 return; 988 } 989 990 rcvbuf = &req->rq_private_buf; 991 len = desc->count; 992 if (len > transport->tcp_reclen - transport->tcp_offset) { 993 struct xdr_skb_reader my_desc; 994 995 len = transport->tcp_reclen - transport->tcp_offset; 996 memcpy(&my_desc, desc, sizeof(my_desc)); 997 my_desc.count = len; 998 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 999 &my_desc, xdr_skb_read_bits); 1000 desc->count -= r; 1001 desc->offset += r; 1002 } else 1003 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1004 desc, xdr_skb_read_bits); 1005 1006 if (r > 0) { 1007 transport->tcp_copied += r; 1008 transport->tcp_offset += r; 1009 } 1010 if (r != len) { 1011 /* Error when copying to the receive buffer, 1012 * usually because we weren't able to allocate 1013 * additional buffer pages. All we can do now 1014 * is turn off TCP_RCV_COPY_DATA, so the request 1015 * will not receive any additional updates, 1016 * and time out. 1017 * Any remaining data from this record will 1018 * be discarded. 1019 */ 1020 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1021 dprintk("RPC: XID %08x truncated request\n", 1022 ntohl(transport->tcp_xid)); 1023 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1024 "tcp_offset = %u, tcp_reclen = %u\n", 1025 xprt, transport->tcp_copied, 1026 transport->tcp_offset, transport->tcp_reclen); 1027 goto out; 1028 } 1029 1030 dprintk("RPC: XID %08x read %Zd bytes\n", 1031 ntohl(transport->tcp_xid), r); 1032 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1033 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1034 transport->tcp_offset, transport->tcp_reclen); 1035 1036 if (transport->tcp_copied == req->rq_private_buf.buflen) 1037 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1038 else if (transport->tcp_offset == transport->tcp_reclen) { 1039 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1040 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1041 } 1042 1043 out: 1044 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1045 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1046 spin_unlock(&xprt->transport_lock); 1047 xs_tcp_check_fraghdr(transport); 1048 } 1049 1050 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1051 { 1052 size_t len; 1053 1054 len = transport->tcp_reclen - transport->tcp_offset; 1055 if (len > desc->count) 1056 len = desc->count; 1057 desc->count -= len; 1058 desc->offset += len; 1059 transport->tcp_offset += len; 1060 dprintk("RPC: discarded %Zu bytes\n", len); 1061 xs_tcp_check_fraghdr(transport); 1062 } 1063 1064 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1065 { 1066 struct rpc_xprt *xprt = rd_desc->arg.data; 1067 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1068 struct xdr_skb_reader desc = { 1069 .skb = skb, 1070 .offset = offset, 1071 .count = len, 1072 }; 1073 1074 dprintk("RPC: xs_tcp_data_recv started\n"); 1075 do { 1076 /* Read in a new fragment marker if necessary */ 1077 /* Can we ever really expect to get completely empty fragments? */ 1078 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1079 xs_tcp_read_fraghdr(xprt, &desc); 1080 continue; 1081 } 1082 /* Read in the xid if necessary */ 1083 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1084 xs_tcp_read_xid(transport, &desc); 1085 continue; 1086 } 1087 /* Read in the request data */ 1088 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1089 xs_tcp_read_request(xprt, &desc); 1090 continue; 1091 } 1092 /* Skip over any trailing bytes on short reads */ 1093 xs_tcp_read_discard(transport, &desc); 1094 } while (desc.count); 1095 dprintk("RPC: xs_tcp_data_recv done\n"); 1096 return len - desc.count; 1097 } 1098 1099 /** 1100 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1101 * @sk: socket with data to read 1102 * @bytes: how much data to read 1103 * 1104 */ 1105 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1106 { 1107 struct rpc_xprt *xprt; 1108 read_descriptor_t rd_desc; 1109 int read; 1110 1111 dprintk("RPC: xs_tcp_data_ready...\n"); 1112 1113 read_lock(&sk->sk_callback_lock); 1114 if (!(xprt = xprt_from_sock(sk))) 1115 goto out; 1116 if (xprt->shutdown) 1117 goto out; 1118 1119 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1120 rd_desc.arg.data = xprt; 1121 do { 1122 rd_desc.count = 65536; 1123 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1124 } while (read > 0); 1125 out: 1126 read_unlock(&sk->sk_callback_lock); 1127 } 1128 1129 /** 1130 * xs_tcp_state_change - callback to handle TCP socket state changes 1131 * @sk: socket whose state has changed 1132 * 1133 */ 1134 static void xs_tcp_state_change(struct sock *sk) 1135 { 1136 struct rpc_xprt *xprt; 1137 1138 read_lock(&sk->sk_callback_lock); 1139 if (!(xprt = xprt_from_sock(sk))) 1140 goto out; 1141 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1142 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1143 sk->sk_state, xprt_connected(xprt), 1144 sock_flag(sk, SOCK_DEAD), 1145 sock_flag(sk, SOCK_ZAPPED)); 1146 1147 switch (sk->sk_state) { 1148 case TCP_ESTABLISHED: 1149 spin_lock_bh(&xprt->transport_lock); 1150 if (!xprt_test_and_set_connected(xprt)) { 1151 struct sock_xprt *transport = container_of(xprt, 1152 struct sock_xprt, xprt); 1153 1154 /* Reset TCP record info */ 1155 transport->tcp_offset = 0; 1156 transport->tcp_reclen = 0; 1157 transport->tcp_copied = 0; 1158 transport->tcp_flags = 1159 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1160 1161 xprt_wake_pending_tasks(xprt, 0); 1162 } 1163 spin_unlock_bh(&xprt->transport_lock); 1164 break; 1165 case TCP_FIN_WAIT1: 1166 /* The client initiated a shutdown of the socket */ 1167 xprt->connect_cookie++; 1168 xprt->reestablish_timeout = 0; 1169 set_bit(XPRT_CLOSING, &xprt->state); 1170 smp_mb__before_clear_bit(); 1171 clear_bit(XPRT_CONNECTED, &xprt->state); 1172 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1173 smp_mb__after_clear_bit(); 1174 break; 1175 case TCP_CLOSE_WAIT: 1176 /* The server initiated a shutdown of the socket */ 1177 set_bit(XPRT_CLOSING, &xprt->state); 1178 xprt_force_disconnect(xprt); 1179 case TCP_SYN_SENT: 1180 xprt->connect_cookie++; 1181 case TCP_CLOSING: 1182 /* 1183 * If the server closed down the connection, make sure that 1184 * we back off before reconnecting 1185 */ 1186 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1187 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1188 break; 1189 case TCP_LAST_ACK: 1190 smp_mb__before_clear_bit(); 1191 clear_bit(XPRT_CONNECTED, &xprt->state); 1192 smp_mb__after_clear_bit(); 1193 break; 1194 case TCP_CLOSE: 1195 smp_mb__before_clear_bit(); 1196 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1197 clear_bit(XPRT_CLOSING, &xprt->state); 1198 smp_mb__after_clear_bit(); 1199 /* Mark transport as closed and wake up all pending tasks */ 1200 xprt_disconnect_done(xprt); 1201 } 1202 out: 1203 read_unlock(&sk->sk_callback_lock); 1204 } 1205 1206 /** 1207 * xs_tcp_error_report - callback mainly for catching RST events 1208 * @sk: socket 1209 */ 1210 static void xs_tcp_error_report(struct sock *sk) 1211 { 1212 struct rpc_xprt *xprt; 1213 1214 read_lock(&sk->sk_callback_lock); 1215 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED) 1216 goto out; 1217 if (!(xprt = xprt_from_sock(sk))) 1218 goto out; 1219 dprintk("RPC: %s client %p...\n" 1220 "RPC: error %d\n", 1221 __func__, xprt, sk->sk_err); 1222 1223 xprt_force_disconnect(xprt); 1224 out: 1225 read_unlock(&sk->sk_callback_lock); 1226 } 1227 1228 /** 1229 * xs_udp_write_space - callback invoked when socket buffer space 1230 * becomes available 1231 * @sk: socket whose state has changed 1232 * 1233 * Called when more output buffer space is available for this socket. 1234 * We try not to wake our writers until they can make "significant" 1235 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1236 * with a bunch of small requests. 1237 */ 1238 static void xs_udp_write_space(struct sock *sk) 1239 { 1240 read_lock(&sk->sk_callback_lock); 1241 1242 /* from net/core/sock.c:sock_def_write_space */ 1243 if (sock_writeable(sk)) { 1244 struct socket *sock; 1245 struct rpc_xprt *xprt; 1246 1247 if (unlikely(!(sock = sk->sk_socket))) 1248 goto out; 1249 clear_bit(SOCK_NOSPACE, &sock->flags); 1250 1251 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1252 goto out; 1253 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1254 goto out; 1255 1256 xprt_write_space(xprt); 1257 } 1258 1259 out: 1260 read_unlock(&sk->sk_callback_lock); 1261 } 1262 1263 /** 1264 * xs_tcp_write_space - callback invoked when socket buffer space 1265 * becomes available 1266 * @sk: socket whose state has changed 1267 * 1268 * Called when more output buffer space is available for this socket. 1269 * We try not to wake our writers until they can make "significant" 1270 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1271 * with a bunch of small requests. 1272 */ 1273 static void xs_tcp_write_space(struct sock *sk) 1274 { 1275 read_lock(&sk->sk_callback_lock); 1276 1277 /* from net/core/stream.c:sk_stream_write_space */ 1278 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 1279 struct socket *sock; 1280 struct rpc_xprt *xprt; 1281 1282 if (unlikely(!(sock = sk->sk_socket))) 1283 goto out; 1284 clear_bit(SOCK_NOSPACE, &sock->flags); 1285 1286 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1287 goto out; 1288 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1289 goto out; 1290 1291 xprt_write_space(xprt); 1292 } 1293 1294 out: 1295 read_unlock(&sk->sk_callback_lock); 1296 } 1297 1298 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1299 { 1300 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1301 struct sock *sk = transport->inet; 1302 1303 if (transport->rcvsize) { 1304 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1305 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1306 } 1307 if (transport->sndsize) { 1308 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1309 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1310 sk->sk_write_space(sk); 1311 } 1312 } 1313 1314 /** 1315 * xs_udp_set_buffer_size - set send and receive limits 1316 * @xprt: generic transport 1317 * @sndsize: requested size of send buffer, in bytes 1318 * @rcvsize: requested size of receive buffer, in bytes 1319 * 1320 * Set socket send and receive buffer size limits. 1321 */ 1322 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1323 { 1324 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1325 1326 transport->sndsize = 0; 1327 if (sndsize) 1328 transport->sndsize = sndsize + 1024; 1329 transport->rcvsize = 0; 1330 if (rcvsize) 1331 transport->rcvsize = rcvsize + 1024; 1332 1333 xs_udp_do_set_buffer_size(xprt); 1334 } 1335 1336 /** 1337 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1338 * @task: task that timed out 1339 * 1340 * Adjust the congestion window after a retransmit timeout has occurred. 1341 */ 1342 static void xs_udp_timer(struct rpc_task *task) 1343 { 1344 xprt_adjust_cwnd(task, -ETIMEDOUT); 1345 } 1346 1347 static unsigned short xs_get_random_port(void) 1348 { 1349 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1350 unsigned short rand = (unsigned short) net_random() % range; 1351 return rand + xprt_min_resvport; 1352 } 1353 1354 /** 1355 * xs_set_port - reset the port number in the remote endpoint address 1356 * @xprt: generic transport 1357 * @port: new port number 1358 * 1359 */ 1360 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1361 { 1362 struct sockaddr *addr = xs_addr(xprt); 1363 1364 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1365 1366 switch (addr->sa_family) { 1367 case AF_INET: 1368 ((struct sockaddr_in *)addr)->sin_port = htons(port); 1369 break; 1370 case AF_INET6: 1371 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); 1372 break; 1373 default: 1374 BUG(); 1375 } 1376 } 1377 1378 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1379 { 1380 unsigned short port = transport->port; 1381 1382 if (port == 0 && transport->xprt.resvport) 1383 port = xs_get_random_port(); 1384 return port; 1385 } 1386 1387 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1388 { 1389 if (transport->port != 0) 1390 transport->port = 0; 1391 if (!transport->xprt.resvport) 1392 return 0; 1393 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1394 return xprt_max_resvport; 1395 return --port; 1396 } 1397 1398 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1399 { 1400 struct sockaddr_in myaddr = { 1401 .sin_family = AF_INET, 1402 }; 1403 struct sockaddr_in *sa; 1404 int err, nloop = 0; 1405 unsigned short port = xs_get_srcport(transport, sock); 1406 unsigned short last; 1407 1408 sa = (struct sockaddr_in *)&transport->addr; 1409 myaddr.sin_addr = sa->sin_addr; 1410 do { 1411 myaddr.sin_port = htons(port); 1412 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1413 sizeof(myaddr)); 1414 if (port == 0) 1415 break; 1416 if (err == 0) { 1417 transport->port = port; 1418 break; 1419 } 1420 last = port; 1421 port = xs_next_srcport(transport, sock, port); 1422 if (port > last) 1423 nloop++; 1424 } while (err == -EADDRINUSE && nloop != 2); 1425 dprintk("RPC: %s %pI4:%u: %s (%d)\n", 1426 __func__, &myaddr.sin_addr, 1427 port, err ? "failed" : "ok", err); 1428 return err; 1429 } 1430 1431 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1432 { 1433 struct sockaddr_in6 myaddr = { 1434 .sin6_family = AF_INET6, 1435 }; 1436 struct sockaddr_in6 *sa; 1437 int err, nloop = 0; 1438 unsigned short port = xs_get_srcport(transport, sock); 1439 unsigned short last; 1440 1441 sa = (struct sockaddr_in6 *)&transport->addr; 1442 myaddr.sin6_addr = sa->sin6_addr; 1443 do { 1444 myaddr.sin6_port = htons(port); 1445 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1446 sizeof(myaddr)); 1447 if (port == 0) 1448 break; 1449 if (err == 0) { 1450 transport->port = port; 1451 break; 1452 } 1453 last = port; 1454 port = xs_next_srcport(transport, sock, port); 1455 if (port > last) 1456 nloop++; 1457 } while (err == -EADDRINUSE && nloop != 2); 1458 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", 1459 &myaddr.sin6_addr, port, err ? "failed" : "ok", err); 1460 return err; 1461 } 1462 1463 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1464 static struct lock_class_key xs_key[2]; 1465 static struct lock_class_key xs_slock_key[2]; 1466 1467 static inline void xs_reclassify_socket4(struct socket *sock) 1468 { 1469 struct sock *sk = sock->sk; 1470 1471 BUG_ON(sock_owned_by_user(sk)); 1472 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1473 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1474 } 1475 1476 static inline void xs_reclassify_socket6(struct socket *sock) 1477 { 1478 struct sock *sk = sock->sk; 1479 1480 BUG_ON(sock_owned_by_user(sk)); 1481 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1482 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1483 } 1484 #else 1485 static inline void xs_reclassify_socket4(struct socket *sock) 1486 { 1487 } 1488 1489 static inline void xs_reclassify_socket6(struct socket *sock) 1490 { 1491 } 1492 #endif 1493 1494 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1495 { 1496 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1497 1498 if (!transport->inet) { 1499 struct sock *sk = sock->sk; 1500 1501 write_lock_bh(&sk->sk_callback_lock); 1502 1503 xs_save_old_callbacks(transport, sk); 1504 1505 sk->sk_user_data = xprt; 1506 sk->sk_data_ready = xs_udp_data_ready; 1507 sk->sk_write_space = xs_udp_write_space; 1508 sk->sk_no_check = UDP_CSUM_NORCV; 1509 sk->sk_allocation = GFP_ATOMIC; 1510 1511 xprt_set_connected(xprt); 1512 1513 /* Reset to new socket */ 1514 transport->sock = sock; 1515 transport->inet = sk; 1516 1517 write_unlock_bh(&sk->sk_callback_lock); 1518 } 1519 xs_udp_do_set_buffer_size(xprt); 1520 } 1521 1522 /** 1523 * xs_udp_connect_worker4 - set up a UDP socket 1524 * @work: RPC transport to connect 1525 * 1526 * Invoked by a work queue tasklet. 1527 */ 1528 static void xs_udp_connect_worker4(struct work_struct *work) 1529 { 1530 struct sock_xprt *transport = 1531 container_of(work, struct sock_xprt, connect_worker.work); 1532 struct rpc_xprt *xprt = &transport->xprt; 1533 struct socket *sock = transport->sock; 1534 int err, status = -EIO; 1535 1536 if (xprt->shutdown) 1537 goto out; 1538 1539 /* Start by resetting any existing state */ 1540 xs_close(xprt); 1541 1542 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1543 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1544 goto out; 1545 } 1546 xs_reclassify_socket4(sock); 1547 1548 if (xs_bind4(transport, sock)) { 1549 sock_release(sock); 1550 goto out; 1551 } 1552 1553 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1554 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1555 1556 xs_udp_finish_connecting(xprt, sock); 1557 status = 0; 1558 out: 1559 xprt_wake_pending_tasks(xprt, status); 1560 xprt_clear_connecting(xprt); 1561 } 1562 1563 /** 1564 * xs_udp_connect_worker6 - set up a UDP socket 1565 * @work: RPC transport to connect 1566 * 1567 * Invoked by a work queue tasklet. 1568 */ 1569 static void xs_udp_connect_worker6(struct work_struct *work) 1570 { 1571 struct sock_xprt *transport = 1572 container_of(work, struct sock_xprt, connect_worker.work); 1573 struct rpc_xprt *xprt = &transport->xprt; 1574 struct socket *sock = transport->sock; 1575 int err, status = -EIO; 1576 1577 if (xprt->shutdown) 1578 goto out; 1579 1580 /* Start by resetting any existing state */ 1581 xs_close(xprt); 1582 1583 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1584 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1585 goto out; 1586 } 1587 xs_reclassify_socket6(sock); 1588 1589 if (xs_bind6(transport, sock) < 0) { 1590 sock_release(sock); 1591 goto out; 1592 } 1593 1594 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1595 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1596 1597 xs_udp_finish_connecting(xprt, sock); 1598 status = 0; 1599 out: 1600 xprt_wake_pending_tasks(xprt, status); 1601 xprt_clear_connecting(xprt); 1602 } 1603 1604 /* 1605 * We need to preserve the port number so the reply cache on the server can 1606 * find our cached RPC replies when we get around to reconnecting. 1607 */ 1608 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 1609 { 1610 int result; 1611 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1612 struct sockaddr any; 1613 1614 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1615 1616 /* 1617 * Disconnect the transport socket by doing a connect operation 1618 * with AF_UNSPEC. This should return immediately... 1619 */ 1620 memset(&any, 0, sizeof(any)); 1621 any.sa_family = AF_UNSPEC; 1622 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1623 if (result) 1624 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1625 result); 1626 } 1627 1628 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1629 { 1630 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1631 1632 if (!transport->inet) { 1633 struct sock *sk = sock->sk; 1634 1635 write_lock_bh(&sk->sk_callback_lock); 1636 1637 xs_save_old_callbacks(transport, sk); 1638 1639 sk->sk_user_data = xprt; 1640 sk->sk_data_ready = xs_tcp_data_ready; 1641 sk->sk_state_change = xs_tcp_state_change; 1642 sk->sk_write_space = xs_tcp_write_space; 1643 sk->sk_error_report = xs_tcp_error_report; 1644 sk->sk_allocation = GFP_ATOMIC; 1645 1646 /* socket options */ 1647 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1648 sock_reset_flag(sk, SOCK_LINGER); 1649 tcp_sk(sk)->linger2 = 0; 1650 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1651 1652 xprt_clear_connected(xprt); 1653 1654 /* Reset to new socket */ 1655 transport->sock = sock; 1656 transport->inet = sk; 1657 1658 write_unlock_bh(&sk->sk_callback_lock); 1659 } 1660 1661 if (!xprt_bound(xprt)) 1662 return -ENOTCONN; 1663 1664 /* Tell the socket layer to start connecting... */ 1665 xprt->stat.connect_count++; 1666 xprt->stat.connect_start = jiffies; 1667 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1668 } 1669 1670 /** 1671 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1672 * @work: RPC transport to connect 1673 * 1674 * Invoked by a work queue tasklet. 1675 */ 1676 static void xs_tcp_connect_worker4(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 err, status = -EIO; 1683 1684 if (xprt->shutdown) 1685 goto out; 1686 1687 if (!sock) { 1688 /* start from scratch */ 1689 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1690 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1691 goto out; 1692 } 1693 xs_reclassify_socket4(sock); 1694 1695 if (xs_bind4(transport, sock) < 0) { 1696 sock_release(sock); 1697 goto out; 1698 } 1699 } else 1700 /* "close" the socket, preserving the local port */ 1701 xs_tcp_reuse_connection(xprt); 1702 1703 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1704 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1705 1706 status = xs_tcp_finish_connecting(xprt, sock); 1707 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1708 xprt, -status, xprt_connected(xprt), 1709 sock->sk->sk_state); 1710 if (status < 0) { 1711 switch (status) { 1712 case -EINPROGRESS: 1713 case -EALREADY: 1714 goto out_clear; 1715 case -ECONNREFUSED: 1716 case -ECONNRESET: 1717 /* retry with existing socket, after a delay */ 1718 break; 1719 default: 1720 /* get rid of existing socket, and retry */ 1721 xs_tcp_shutdown(xprt); 1722 } 1723 } 1724 out: 1725 xprt_wake_pending_tasks(xprt, status); 1726 out_clear: 1727 xprt_clear_connecting(xprt); 1728 } 1729 1730 /** 1731 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1732 * @work: RPC transport to connect 1733 * 1734 * Invoked by a work queue tasklet. 1735 */ 1736 static void xs_tcp_connect_worker6(struct work_struct *work) 1737 { 1738 struct sock_xprt *transport = 1739 container_of(work, struct sock_xprt, connect_worker.work); 1740 struct rpc_xprt *xprt = &transport->xprt; 1741 struct socket *sock = transport->sock; 1742 int err, status = -EIO; 1743 1744 if (xprt->shutdown) 1745 goto out; 1746 1747 if (!sock) { 1748 /* start from scratch */ 1749 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1750 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1751 goto out; 1752 } 1753 xs_reclassify_socket6(sock); 1754 1755 if (xs_bind6(transport, sock) < 0) { 1756 sock_release(sock); 1757 goto out; 1758 } 1759 } else 1760 /* "close" the socket, preserving the local port */ 1761 xs_tcp_reuse_connection(xprt); 1762 1763 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1764 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1765 1766 status = xs_tcp_finish_connecting(xprt, sock); 1767 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1768 xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1769 if (status < 0) { 1770 switch (status) { 1771 case -EINPROGRESS: 1772 case -EALREADY: 1773 goto out_clear; 1774 case -ECONNREFUSED: 1775 case -ECONNRESET: 1776 /* retry with existing socket, after a delay */ 1777 break; 1778 default: 1779 /* get rid of existing socket, and retry */ 1780 xs_tcp_shutdown(xprt); 1781 } 1782 } 1783 out: 1784 xprt_wake_pending_tasks(xprt, status); 1785 out_clear: 1786 xprt_clear_connecting(xprt); 1787 } 1788 1789 /** 1790 * xs_connect - connect a socket to a remote endpoint 1791 * @task: address of RPC task that manages state of connect request 1792 * 1793 * TCP: If the remote end dropped the connection, delay reconnecting. 1794 * 1795 * UDP socket connects are synchronous, but we use a work queue anyway 1796 * to guarantee that even unprivileged user processes can set up a 1797 * socket on a privileged port. 1798 * 1799 * If a UDP socket connect fails, the delay behavior here prevents 1800 * retry floods (hard mounts). 1801 */ 1802 static void xs_connect(struct rpc_task *task) 1803 { 1804 struct rpc_xprt *xprt = task->tk_xprt; 1805 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1806 1807 if (xprt_test_and_set_connecting(xprt)) 1808 return; 1809 1810 if (transport->sock != NULL) { 1811 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1812 "seconds\n", 1813 xprt, xprt->reestablish_timeout / HZ); 1814 queue_delayed_work(rpciod_workqueue, 1815 &transport->connect_worker, 1816 xprt->reestablish_timeout); 1817 xprt->reestablish_timeout <<= 1; 1818 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1819 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1820 } else { 1821 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1822 queue_delayed_work(rpciod_workqueue, 1823 &transport->connect_worker, 0); 1824 } 1825 } 1826 1827 static void xs_tcp_connect(struct rpc_task *task) 1828 { 1829 struct rpc_xprt *xprt = task->tk_xprt; 1830 1831 /* Initiate graceful shutdown of the socket if not already done */ 1832 if (test_bit(XPRT_CONNECTED, &xprt->state)) 1833 xs_tcp_shutdown(xprt); 1834 /* Exit if we need to wait for socket shutdown to complete */ 1835 if (test_bit(XPRT_CLOSING, &xprt->state)) 1836 return; 1837 xs_connect(task); 1838 } 1839 1840 /** 1841 * xs_udp_print_stats - display UDP socket-specifc stats 1842 * @xprt: rpc_xprt struct containing statistics 1843 * @seq: output file 1844 * 1845 */ 1846 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1847 { 1848 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1849 1850 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1851 transport->port, 1852 xprt->stat.bind_count, 1853 xprt->stat.sends, 1854 xprt->stat.recvs, 1855 xprt->stat.bad_xids, 1856 xprt->stat.req_u, 1857 xprt->stat.bklog_u); 1858 } 1859 1860 /** 1861 * xs_tcp_print_stats - display TCP socket-specifc stats 1862 * @xprt: rpc_xprt struct containing statistics 1863 * @seq: output file 1864 * 1865 */ 1866 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1867 { 1868 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1869 long idle_time = 0; 1870 1871 if (xprt_connected(xprt)) 1872 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1873 1874 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1875 transport->port, 1876 xprt->stat.bind_count, 1877 xprt->stat.connect_count, 1878 xprt->stat.connect_time, 1879 idle_time, 1880 xprt->stat.sends, 1881 xprt->stat.recvs, 1882 xprt->stat.bad_xids, 1883 xprt->stat.req_u, 1884 xprt->stat.bklog_u); 1885 } 1886 1887 static struct rpc_xprt_ops xs_udp_ops = { 1888 .set_buffer_size = xs_udp_set_buffer_size, 1889 .reserve_xprt = xprt_reserve_xprt_cong, 1890 .release_xprt = xprt_release_xprt_cong, 1891 .rpcbind = rpcb_getport_async, 1892 .set_port = xs_set_port, 1893 .connect = xs_connect, 1894 .buf_alloc = rpc_malloc, 1895 .buf_free = rpc_free, 1896 .send_request = xs_udp_send_request, 1897 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1898 .timer = xs_udp_timer, 1899 .release_request = xprt_release_rqst_cong, 1900 .close = xs_close, 1901 .destroy = xs_destroy, 1902 .print_stats = xs_udp_print_stats, 1903 }; 1904 1905 static struct rpc_xprt_ops xs_tcp_ops = { 1906 .reserve_xprt = xprt_reserve_xprt, 1907 .release_xprt = xs_tcp_release_xprt, 1908 .rpcbind = rpcb_getport_async, 1909 .set_port = xs_set_port, 1910 .connect = xs_tcp_connect, 1911 .buf_alloc = rpc_malloc, 1912 .buf_free = rpc_free, 1913 .send_request = xs_tcp_send_request, 1914 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1915 .close = xs_tcp_shutdown, 1916 .destroy = xs_destroy, 1917 .print_stats = xs_tcp_print_stats, 1918 }; 1919 1920 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 1921 unsigned int slot_table_size) 1922 { 1923 struct rpc_xprt *xprt; 1924 struct sock_xprt *new; 1925 1926 if (args->addrlen > sizeof(xprt->addr)) { 1927 dprintk("RPC: xs_setup_xprt: address too large\n"); 1928 return ERR_PTR(-EBADF); 1929 } 1930 1931 new = kzalloc(sizeof(*new), GFP_KERNEL); 1932 if (new == NULL) { 1933 dprintk("RPC: xs_setup_xprt: couldn't allocate " 1934 "rpc_xprt\n"); 1935 return ERR_PTR(-ENOMEM); 1936 } 1937 xprt = &new->xprt; 1938 1939 xprt->max_reqs = slot_table_size; 1940 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 1941 if (xprt->slot == NULL) { 1942 kfree(xprt); 1943 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 1944 "table\n"); 1945 return ERR_PTR(-ENOMEM); 1946 } 1947 1948 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 1949 xprt->addrlen = args->addrlen; 1950 if (args->srcaddr) 1951 memcpy(&new->addr, args->srcaddr, args->addrlen); 1952 1953 return xprt; 1954 } 1955 1956 static const struct rpc_timeout xs_udp_default_timeout = { 1957 .to_initval = 5 * HZ, 1958 .to_maxval = 30 * HZ, 1959 .to_increment = 5 * HZ, 1960 .to_retries = 5, 1961 }; 1962 1963 /** 1964 * xs_setup_udp - Set up transport to use a UDP socket 1965 * @args: rpc transport creation arguments 1966 * 1967 */ 1968 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 1969 { 1970 struct sockaddr *addr = args->dstaddr; 1971 struct rpc_xprt *xprt; 1972 struct sock_xprt *transport; 1973 1974 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 1975 if (IS_ERR(xprt)) 1976 return xprt; 1977 transport = container_of(xprt, struct sock_xprt, xprt); 1978 1979 xprt->prot = IPPROTO_UDP; 1980 xprt->tsh_size = 0; 1981 /* XXX: header size can vary due to auth type, IPv6, etc. */ 1982 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1983 1984 xprt->bind_timeout = XS_BIND_TO; 1985 xprt->connect_timeout = XS_UDP_CONN_TO; 1986 xprt->reestablish_timeout = XS_UDP_REEST_TO; 1987 xprt->idle_timeout = XS_IDLE_DISC_TO; 1988 1989 xprt->ops = &xs_udp_ops; 1990 1991 xprt->timeout = &xs_udp_default_timeout; 1992 1993 switch (addr->sa_family) { 1994 case AF_INET: 1995 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1996 xprt_set_bound(xprt); 1997 1998 INIT_DELAYED_WORK(&transport->connect_worker, 1999 xs_udp_connect_worker4); 2000 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2001 break; 2002 case AF_INET6: 2003 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2004 xprt_set_bound(xprt); 2005 2006 INIT_DELAYED_WORK(&transport->connect_worker, 2007 xs_udp_connect_worker6); 2008 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2009 break; 2010 default: 2011 kfree(xprt); 2012 return ERR_PTR(-EAFNOSUPPORT); 2013 } 2014 2015 dprintk("RPC: set up transport to address %s\n", 2016 xprt->address_strings[RPC_DISPLAY_ALL]); 2017 2018 if (try_module_get(THIS_MODULE)) 2019 return xprt; 2020 2021 kfree(xprt->slot); 2022 kfree(xprt); 2023 return ERR_PTR(-EINVAL); 2024 } 2025 2026 static const struct rpc_timeout xs_tcp_default_timeout = { 2027 .to_initval = 60 * HZ, 2028 .to_maxval = 60 * HZ, 2029 .to_retries = 2, 2030 }; 2031 2032 /** 2033 * xs_setup_tcp - Set up transport to use a TCP socket 2034 * @args: rpc transport creation arguments 2035 * 2036 */ 2037 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2038 { 2039 struct sockaddr *addr = args->dstaddr; 2040 struct rpc_xprt *xprt; 2041 struct sock_xprt *transport; 2042 2043 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2044 if (IS_ERR(xprt)) 2045 return xprt; 2046 transport = container_of(xprt, struct sock_xprt, xprt); 2047 2048 xprt->prot = IPPROTO_TCP; 2049 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2050 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2051 2052 xprt->bind_timeout = XS_BIND_TO; 2053 xprt->connect_timeout = XS_TCP_CONN_TO; 2054 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2055 xprt->idle_timeout = XS_IDLE_DISC_TO; 2056 2057 xprt->ops = &xs_tcp_ops; 2058 xprt->timeout = &xs_tcp_default_timeout; 2059 2060 switch (addr->sa_family) { 2061 case AF_INET: 2062 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2063 xprt_set_bound(xprt); 2064 2065 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); 2066 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2067 break; 2068 case AF_INET6: 2069 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2070 xprt_set_bound(xprt); 2071 2072 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); 2073 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2074 break; 2075 default: 2076 kfree(xprt); 2077 return ERR_PTR(-EAFNOSUPPORT); 2078 } 2079 2080 dprintk("RPC: set up transport to address %s\n", 2081 xprt->address_strings[RPC_DISPLAY_ALL]); 2082 2083 if (try_module_get(THIS_MODULE)) 2084 return xprt; 2085 2086 kfree(xprt->slot); 2087 kfree(xprt); 2088 return ERR_PTR(-EINVAL); 2089 } 2090 2091 static struct xprt_class xs_udp_transport = { 2092 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2093 .name = "udp", 2094 .owner = THIS_MODULE, 2095 .ident = IPPROTO_UDP, 2096 .setup = xs_setup_udp, 2097 }; 2098 2099 static struct xprt_class xs_tcp_transport = { 2100 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2101 .name = "tcp", 2102 .owner = THIS_MODULE, 2103 .ident = IPPROTO_TCP, 2104 .setup = xs_setup_tcp, 2105 }; 2106 2107 /** 2108 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2109 * 2110 */ 2111 int init_socket_xprt(void) 2112 { 2113 #ifdef RPC_DEBUG 2114 if (!sunrpc_table_header) 2115 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2116 #endif 2117 2118 xprt_register_transport(&xs_udp_transport); 2119 xprt_register_transport(&xs_tcp_transport); 2120 2121 return 0; 2122 } 2123 2124 /** 2125 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2126 * 2127 */ 2128 void cleanup_socket_xprt(void) 2129 { 2130 #ifdef RPC_DEBUG 2131 if (sunrpc_table_header) { 2132 unregister_sysctl_table(sunrpc_table_header); 2133 sunrpc_table_header = NULL; 2134 } 2135 #endif 2136 2137 xprt_unregister_transport(&xs_udp_transport); 2138 xprt_unregister_transport(&xs_tcp_transport); 2139 } 2140