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 -ENOTCONN; 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 status = xs_sendpages(transport->sock, 581 xs_addr(xprt), 582 xprt->addrlen, xdr, 583 req->rq_bytes_sent); 584 585 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 586 xdr->len - req->rq_bytes_sent, status); 587 588 if (status >= 0) { 589 task->tk_bytes_sent += status; 590 if (status >= req->rq_slen) 591 return 0; 592 /* Still some bytes left; set up for a retry later. */ 593 status = -EAGAIN; 594 } 595 596 switch (status) { 597 case -EAGAIN: 598 xs_nospace(task); 599 break; 600 case -ENETUNREACH: 601 case -EPIPE: 602 case -ECONNREFUSED: 603 /* When the server has died, an ICMP port unreachable message 604 * prompts ECONNREFUSED. */ 605 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 606 break; 607 default: 608 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 609 dprintk("RPC: sendmsg returned unrecognized error %d\n", 610 -status); 611 } 612 613 return status; 614 } 615 616 /** 617 * xs_tcp_shutdown - gracefully shut down a TCP socket 618 * @xprt: transport 619 * 620 * Initiates a graceful shutdown of the TCP socket by calling the 621 * equivalent of shutdown(SHUT_WR); 622 */ 623 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 624 { 625 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 626 struct socket *sock = transport->sock; 627 628 if (sock != NULL) 629 kernel_sock_shutdown(sock, SHUT_WR); 630 } 631 632 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 633 { 634 u32 reclen = buf->len - sizeof(rpc_fraghdr); 635 rpc_fraghdr *base = buf->head[0].iov_base; 636 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 637 } 638 639 /** 640 * xs_tcp_send_request - write an RPC request to a TCP socket 641 * @task: address of RPC task that manages the state of an RPC request 642 * 643 * Return values: 644 * 0: The request has been sent 645 * EAGAIN: The socket was blocked, please call again later to 646 * complete the request 647 * ENOTCONN: Caller needs to invoke connect logic then call again 648 * other: Some other error occured, the request was not sent 649 * 650 * XXX: In the case of soft timeouts, should we eventually give up 651 * if sendmsg is not able to make progress? 652 */ 653 static int xs_tcp_send_request(struct rpc_task *task) 654 { 655 struct rpc_rqst *req = task->tk_rqstp; 656 struct rpc_xprt *xprt = req->rq_xprt; 657 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 658 struct xdr_buf *xdr = &req->rq_snd_buf; 659 int status; 660 661 xs_encode_tcp_record_marker(&req->rq_snd_buf); 662 663 xs_pktdump("packet data:", 664 req->rq_svec->iov_base, 665 req->rq_svec->iov_len); 666 667 /* Continue transmitting the packet/record. We must be careful 668 * to cope with writespace callbacks arriving _after_ we have 669 * called sendmsg(). */ 670 while (1) { 671 status = xs_sendpages(transport->sock, 672 NULL, 0, xdr, req->rq_bytes_sent); 673 674 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 675 xdr->len - req->rq_bytes_sent, status); 676 677 if (unlikely(status < 0)) 678 break; 679 680 /* If we've sent the entire packet, immediately 681 * reset the count of bytes sent. */ 682 req->rq_bytes_sent += status; 683 task->tk_bytes_sent += status; 684 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 685 req->rq_bytes_sent = 0; 686 return 0; 687 } 688 689 if (status != 0) 690 continue; 691 status = -EAGAIN; 692 break; 693 } 694 695 switch (status) { 696 case -EAGAIN: 697 xs_nospace(task); 698 break; 699 case -ECONNRESET: 700 xs_tcp_shutdown(xprt); 701 case -ECONNREFUSED: 702 case -ENOTCONN: 703 case -EPIPE: 704 status = -ENOTCONN; 705 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 706 break; 707 default: 708 dprintk("RPC: sendmsg returned unrecognized error %d\n", 709 -status); 710 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 711 xs_tcp_shutdown(xprt); 712 } 713 714 return status; 715 } 716 717 /** 718 * xs_tcp_release_xprt - clean up after a tcp transmission 719 * @xprt: transport 720 * @task: rpc task 721 * 722 * This cleans up if an error causes us to abort the transmission of a request. 723 * In this case, the socket may need to be reset in order to avoid confusing 724 * the server. 725 */ 726 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 727 { 728 struct rpc_rqst *req; 729 730 if (task != xprt->snd_task) 731 return; 732 if (task == NULL) 733 goto out_release; 734 req = task->tk_rqstp; 735 if (req->rq_bytes_sent == 0) 736 goto out_release; 737 if (req->rq_bytes_sent == req->rq_snd_buf.len) 738 goto out_release; 739 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 740 out_release: 741 xprt_release_xprt(xprt, task); 742 } 743 744 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 745 { 746 transport->old_data_ready = sk->sk_data_ready; 747 transport->old_state_change = sk->sk_state_change; 748 transport->old_write_space = sk->sk_write_space; 749 transport->old_error_report = sk->sk_error_report; 750 } 751 752 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 753 { 754 sk->sk_data_ready = transport->old_data_ready; 755 sk->sk_state_change = transport->old_state_change; 756 sk->sk_write_space = transport->old_write_space; 757 sk->sk_error_report = transport->old_error_report; 758 } 759 760 /** 761 * xs_close - close a socket 762 * @xprt: transport 763 * 764 * This is used when all requests are complete; ie, no DRC state remains 765 * on the server we want to save. 766 */ 767 static void xs_close(struct rpc_xprt *xprt) 768 { 769 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 770 struct socket *sock = transport->sock; 771 struct sock *sk = transport->inet; 772 773 if (!sk) 774 goto clear_close_wait; 775 776 dprintk("RPC: xs_close xprt %p\n", xprt); 777 778 write_lock_bh(&sk->sk_callback_lock); 779 transport->inet = NULL; 780 transport->sock = NULL; 781 782 sk->sk_user_data = NULL; 783 784 xs_restore_old_callbacks(transport, sk); 785 write_unlock_bh(&sk->sk_callback_lock); 786 787 sk->sk_no_check = 0; 788 789 sock_release(sock); 790 clear_close_wait: 791 smp_mb__before_clear_bit(); 792 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 793 clear_bit(XPRT_CLOSING, &xprt->state); 794 smp_mb__after_clear_bit(); 795 xprt_disconnect_done(xprt); 796 } 797 798 /** 799 * xs_destroy - prepare to shutdown a transport 800 * @xprt: doomed transport 801 * 802 */ 803 static void xs_destroy(struct rpc_xprt *xprt) 804 { 805 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 806 807 dprintk("RPC: xs_destroy xprt %p\n", xprt); 808 809 cancel_rearming_delayed_work(&transport->connect_worker); 810 811 xs_close(xprt); 812 xs_free_peer_addresses(xprt); 813 kfree(xprt->slot); 814 kfree(xprt); 815 module_put(THIS_MODULE); 816 } 817 818 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 819 { 820 return (struct rpc_xprt *) sk->sk_user_data; 821 } 822 823 /** 824 * xs_udp_data_ready - "data ready" callback for UDP sockets 825 * @sk: socket with data to read 826 * @len: how much data to read 827 * 828 */ 829 static void xs_udp_data_ready(struct sock *sk, int len) 830 { 831 struct rpc_task *task; 832 struct rpc_xprt *xprt; 833 struct rpc_rqst *rovr; 834 struct sk_buff *skb; 835 int err, repsize, copied; 836 u32 _xid; 837 __be32 *xp; 838 839 read_lock(&sk->sk_callback_lock); 840 dprintk("RPC: xs_udp_data_ready...\n"); 841 if (!(xprt = xprt_from_sock(sk))) 842 goto out; 843 844 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 845 goto out; 846 847 if (xprt->shutdown) 848 goto dropit; 849 850 repsize = skb->len - sizeof(struct udphdr); 851 if (repsize < 4) { 852 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 853 goto dropit; 854 } 855 856 /* Copy the XID from the skb... */ 857 xp = skb_header_pointer(skb, sizeof(struct udphdr), 858 sizeof(_xid), &_xid); 859 if (xp == NULL) 860 goto dropit; 861 862 /* Look up and lock the request corresponding to the given XID */ 863 spin_lock(&xprt->transport_lock); 864 rovr = xprt_lookup_rqst(xprt, *xp); 865 if (!rovr) 866 goto out_unlock; 867 task = rovr->rq_task; 868 869 if ((copied = rovr->rq_private_buf.buflen) > repsize) 870 copied = repsize; 871 872 /* Suck it into the iovec, verify checksum if not done by hw. */ 873 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 874 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 875 goto out_unlock; 876 } 877 878 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 879 880 /* Something worked... */ 881 dst_confirm(skb->dst); 882 883 xprt_adjust_cwnd(task, copied); 884 xprt_update_rtt(task); 885 xprt_complete_rqst(task, copied); 886 887 out_unlock: 888 spin_unlock(&xprt->transport_lock); 889 dropit: 890 skb_free_datagram(sk, skb); 891 out: 892 read_unlock(&sk->sk_callback_lock); 893 } 894 895 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 896 { 897 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 898 size_t len, used; 899 char *p; 900 901 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 902 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 903 used = xdr_skb_read_bits(desc, p, len); 904 transport->tcp_offset += used; 905 if (used != len) 906 return; 907 908 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 909 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 910 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 911 else 912 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 913 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 914 915 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 916 transport->tcp_offset = 0; 917 918 /* Sanity check of the record length */ 919 if (unlikely(transport->tcp_reclen < 4)) { 920 dprintk("RPC: invalid TCP record fragment length\n"); 921 xprt_force_disconnect(xprt); 922 return; 923 } 924 dprintk("RPC: reading TCP record fragment of length %d\n", 925 transport->tcp_reclen); 926 } 927 928 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 929 { 930 if (transport->tcp_offset == transport->tcp_reclen) { 931 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 932 transport->tcp_offset = 0; 933 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 934 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 935 transport->tcp_flags |= TCP_RCV_COPY_XID; 936 transport->tcp_copied = 0; 937 } 938 } 939 } 940 941 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 942 { 943 size_t len, used; 944 char *p; 945 946 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 947 dprintk("RPC: reading XID (%Zu bytes)\n", len); 948 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 949 used = xdr_skb_read_bits(desc, p, len); 950 transport->tcp_offset += used; 951 if (used != len) 952 return; 953 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 954 transport->tcp_flags |= TCP_RCV_COPY_DATA; 955 transport->tcp_copied = 4; 956 dprintk("RPC: reading reply for XID %08x\n", 957 ntohl(transport->tcp_xid)); 958 xs_tcp_check_fraghdr(transport); 959 } 960 961 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 962 { 963 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 964 struct rpc_rqst *req; 965 struct xdr_buf *rcvbuf; 966 size_t len; 967 ssize_t r; 968 969 /* Find and lock the request corresponding to this xid */ 970 spin_lock(&xprt->transport_lock); 971 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 972 if (!req) { 973 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 974 dprintk("RPC: XID %08x request not found!\n", 975 ntohl(transport->tcp_xid)); 976 spin_unlock(&xprt->transport_lock); 977 return; 978 } 979 980 rcvbuf = &req->rq_private_buf; 981 len = desc->count; 982 if (len > transport->tcp_reclen - transport->tcp_offset) { 983 struct xdr_skb_reader my_desc; 984 985 len = transport->tcp_reclen - transport->tcp_offset; 986 memcpy(&my_desc, desc, sizeof(my_desc)); 987 my_desc.count = len; 988 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 989 &my_desc, xdr_skb_read_bits); 990 desc->count -= r; 991 desc->offset += r; 992 } else 993 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 994 desc, xdr_skb_read_bits); 995 996 if (r > 0) { 997 transport->tcp_copied += r; 998 transport->tcp_offset += r; 999 } 1000 if (r != len) { 1001 /* Error when copying to the receive buffer, 1002 * usually because we weren't able to allocate 1003 * additional buffer pages. All we can do now 1004 * is turn off TCP_RCV_COPY_DATA, so the request 1005 * will not receive any additional updates, 1006 * and time out. 1007 * Any remaining data from this record will 1008 * be discarded. 1009 */ 1010 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1011 dprintk("RPC: XID %08x truncated request\n", 1012 ntohl(transport->tcp_xid)); 1013 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1014 "tcp_offset = %u, tcp_reclen = %u\n", 1015 xprt, transport->tcp_copied, 1016 transport->tcp_offset, transport->tcp_reclen); 1017 goto out; 1018 } 1019 1020 dprintk("RPC: XID %08x read %Zd bytes\n", 1021 ntohl(transport->tcp_xid), r); 1022 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1023 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1024 transport->tcp_offset, transport->tcp_reclen); 1025 1026 if (transport->tcp_copied == req->rq_private_buf.buflen) 1027 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1028 else if (transport->tcp_offset == transport->tcp_reclen) { 1029 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1030 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1031 } 1032 1033 out: 1034 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1035 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1036 spin_unlock(&xprt->transport_lock); 1037 xs_tcp_check_fraghdr(transport); 1038 } 1039 1040 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1041 { 1042 size_t len; 1043 1044 len = transport->tcp_reclen - transport->tcp_offset; 1045 if (len > desc->count) 1046 len = desc->count; 1047 desc->count -= len; 1048 desc->offset += len; 1049 transport->tcp_offset += len; 1050 dprintk("RPC: discarded %Zu bytes\n", len); 1051 xs_tcp_check_fraghdr(transport); 1052 } 1053 1054 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1055 { 1056 struct rpc_xprt *xprt = rd_desc->arg.data; 1057 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1058 struct xdr_skb_reader desc = { 1059 .skb = skb, 1060 .offset = offset, 1061 .count = len, 1062 }; 1063 1064 dprintk("RPC: xs_tcp_data_recv started\n"); 1065 do { 1066 /* Read in a new fragment marker if necessary */ 1067 /* Can we ever really expect to get completely empty fragments? */ 1068 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1069 xs_tcp_read_fraghdr(xprt, &desc); 1070 continue; 1071 } 1072 /* Read in the xid if necessary */ 1073 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1074 xs_tcp_read_xid(transport, &desc); 1075 continue; 1076 } 1077 /* Read in the request data */ 1078 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1079 xs_tcp_read_request(xprt, &desc); 1080 continue; 1081 } 1082 /* Skip over any trailing bytes on short reads */ 1083 xs_tcp_read_discard(transport, &desc); 1084 } while (desc.count); 1085 dprintk("RPC: xs_tcp_data_recv done\n"); 1086 return len - desc.count; 1087 } 1088 1089 /** 1090 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1091 * @sk: socket with data to read 1092 * @bytes: how much data to read 1093 * 1094 */ 1095 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1096 { 1097 struct rpc_xprt *xprt; 1098 read_descriptor_t rd_desc; 1099 int read; 1100 1101 dprintk("RPC: xs_tcp_data_ready...\n"); 1102 1103 read_lock(&sk->sk_callback_lock); 1104 if (!(xprt = xprt_from_sock(sk))) 1105 goto out; 1106 if (xprt->shutdown) 1107 goto out; 1108 1109 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1110 rd_desc.arg.data = xprt; 1111 do { 1112 rd_desc.count = 65536; 1113 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1114 } while (read > 0); 1115 out: 1116 read_unlock(&sk->sk_callback_lock); 1117 } 1118 1119 /** 1120 * xs_tcp_state_change - callback to handle TCP socket state changes 1121 * @sk: socket whose state has changed 1122 * 1123 */ 1124 static void xs_tcp_state_change(struct sock *sk) 1125 { 1126 struct rpc_xprt *xprt; 1127 1128 read_lock(&sk->sk_callback_lock); 1129 if (!(xprt = xprt_from_sock(sk))) 1130 goto out; 1131 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1132 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1133 sk->sk_state, xprt_connected(xprt), 1134 sock_flag(sk, SOCK_DEAD), 1135 sock_flag(sk, SOCK_ZAPPED)); 1136 1137 switch (sk->sk_state) { 1138 case TCP_ESTABLISHED: 1139 spin_lock_bh(&xprt->transport_lock); 1140 if (!xprt_test_and_set_connected(xprt)) { 1141 struct sock_xprt *transport = container_of(xprt, 1142 struct sock_xprt, xprt); 1143 1144 /* Reset TCP record info */ 1145 transport->tcp_offset = 0; 1146 transport->tcp_reclen = 0; 1147 transport->tcp_copied = 0; 1148 transport->tcp_flags = 1149 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1150 1151 xprt_wake_pending_tasks(xprt, 0); 1152 } 1153 spin_unlock_bh(&xprt->transport_lock); 1154 break; 1155 case TCP_FIN_WAIT1: 1156 /* The client initiated a shutdown of the socket */ 1157 xprt->connect_cookie++; 1158 xprt->reestablish_timeout = 0; 1159 set_bit(XPRT_CLOSING, &xprt->state); 1160 smp_mb__before_clear_bit(); 1161 clear_bit(XPRT_CONNECTED, &xprt->state); 1162 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1163 smp_mb__after_clear_bit(); 1164 break; 1165 case TCP_CLOSE_WAIT: 1166 /* The server initiated a shutdown of the socket */ 1167 set_bit(XPRT_CLOSING, &xprt->state); 1168 xprt_force_disconnect(xprt); 1169 case TCP_SYN_SENT: 1170 xprt->connect_cookie++; 1171 case TCP_CLOSING: 1172 /* 1173 * If the server closed down the connection, make sure that 1174 * we back off before reconnecting 1175 */ 1176 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1177 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1178 break; 1179 case TCP_LAST_ACK: 1180 smp_mb__before_clear_bit(); 1181 clear_bit(XPRT_CONNECTED, &xprt->state); 1182 smp_mb__after_clear_bit(); 1183 break; 1184 case TCP_CLOSE: 1185 smp_mb__before_clear_bit(); 1186 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1187 clear_bit(XPRT_CLOSING, &xprt->state); 1188 smp_mb__after_clear_bit(); 1189 /* Mark transport as closed and wake up all pending tasks */ 1190 xprt_disconnect_done(xprt); 1191 } 1192 out: 1193 read_unlock(&sk->sk_callback_lock); 1194 } 1195 1196 /** 1197 * xs_tcp_error_report - callback mainly for catching RST events 1198 * @sk: socket 1199 */ 1200 static void xs_tcp_error_report(struct sock *sk) 1201 { 1202 struct rpc_xprt *xprt; 1203 1204 read_lock(&sk->sk_callback_lock); 1205 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED) 1206 goto out; 1207 if (!(xprt = xprt_from_sock(sk))) 1208 goto out; 1209 dprintk("RPC: %s client %p...\n" 1210 "RPC: error %d\n", 1211 __func__, xprt, sk->sk_err); 1212 1213 xprt_force_disconnect(xprt); 1214 out: 1215 read_unlock(&sk->sk_callback_lock); 1216 } 1217 1218 /** 1219 * xs_udp_write_space - callback invoked when socket buffer space 1220 * becomes available 1221 * @sk: socket whose state has changed 1222 * 1223 * Called when more output buffer space is available for this socket. 1224 * We try not to wake our writers until they can make "significant" 1225 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1226 * with a bunch of small requests. 1227 */ 1228 static void xs_udp_write_space(struct sock *sk) 1229 { 1230 read_lock(&sk->sk_callback_lock); 1231 1232 /* from net/core/sock.c:sock_def_write_space */ 1233 if (sock_writeable(sk)) { 1234 struct socket *sock; 1235 struct rpc_xprt *xprt; 1236 1237 if (unlikely(!(sock = sk->sk_socket))) 1238 goto out; 1239 clear_bit(SOCK_NOSPACE, &sock->flags); 1240 1241 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1242 goto out; 1243 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1244 goto out; 1245 1246 xprt_write_space(xprt); 1247 } 1248 1249 out: 1250 read_unlock(&sk->sk_callback_lock); 1251 } 1252 1253 /** 1254 * xs_tcp_write_space - callback invoked when socket buffer space 1255 * becomes available 1256 * @sk: socket whose state has changed 1257 * 1258 * Called when more output buffer space is available for this socket. 1259 * We try not to wake our writers until they can make "significant" 1260 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1261 * with a bunch of small requests. 1262 */ 1263 static void xs_tcp_write_space(struct sock *sk) 1264 { 1265 read_lock(&sk->sk_callback_lock); 1266 1267 /* from net/core/stream.c:sk_stream_write_space */ 1268 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 1269 struct socket *sock; 1270 struct rpc_xprt *xprt; 1271 1272 if (unlikely(!(sock = sk->sk_socket))) 1273 goto out; 1274 clear_bit(SOCK_NOSPACE, &sock->flags); 1275 1276 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1277 goto out; 1278 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1279 goto out; 1280 1281 xprt_write_space(xprt); 1282 } 1283 1284 out: 1285 read_unlock(&sk->sk_callback_lock); 1286 } 1287 1288 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1289 { 1290 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1291 struct sock *sk = transport->inet; 1292 1293 if (transport->rcvsize) { 1294 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1295 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1296 } 1297 if (transport->sndsize) { 1298 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1299 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1300 sk->sk_write_space(sk); 1301 } 1302 } 1303 1304 /** 1305 * xs_udp_set_buffer_size - set send and receive limits 1306 * @xprt: generic transport 1307 * @sndsize: requested size of send buffer, in bytes 1308 * @rcvsize: requested size of receive buffer, in bytes 1309 * 1310 * Set socket send and receive buffer size limits. 1311 */ 1312 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1313 { 1314 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1315 1316 transport->sndsize = 0; 1317 if (sndsize) 1318 transport->sndsize = sndsize + 1024; 1319 transport->rcvsize = 0; 1320 if (rcvsize) 1321 transport->rcvsize = rcvsize + 1024; 1322 1323 xs_udp_do_set_buffer_size(xprt); 1324 } 1325 1326 /** 1327 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1328 * @task: task that timed out 1329 * 1330 * Adjust the congestion window after a retransmit timeout has occurred. 1331 */ 1332 static void xs_udp_timer(struct rpc_task *task) 1333 { 1334 xprt_adjust_cwnd(task, -ETIMEDOUT); 1335 } 1336 1337 static unsigned short xs_get_random_port(void) 1338 { 1339 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1340 unsigned short rand = (unsigned short) net_random() % range; 1341 return rand + xprt_min_resvport; 1342 } 1343 1344 /** 1345 * xs_set_port - reset the port number in the remote endpoint address 1346 * @xprt: generic transport 1347 * @port: new port number 1348 * 1349 */ 1350 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1351 { 1352 struct sockaddr *addr = xs_addr(xprt); 1353 1354 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1355 1356 switch (addr->sa_family) { 1357 case AF_INET: 1358 ((struct sockaddr_in *)addr)->sin_port = htons(port); 1359 break; 1360 case AF_INET6: 1361 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); 1362 break; 1363 default: 1364 BUG(); 1365 } 1366 } 1367 1368 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1369 { 1370 unsigned short port = transport->port; 1371 1372 if (port == 0 && transport->xprt.resvport) 1373 port = xs_get_random_port(); 1374 return port; 1375 } 1376 1377 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1378 { 1379 if (transport->port != 0) 1380 transport->port = 0; 1381 if (!transport->xprt.resvport) 1382 return 0; 1383 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1384 return xprt_max_resvport; 1385 return --port; 1386 } 1387 1388 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1389 { 1390 struct sockaddr_in myaddr = { 1391 .sin_family = AF_INET, 1392 }; 1393 struct sockaddr_in *sa; 1394 int err, nloop = 0; 1395 unsigned short port = xs_get_srcport(transport, sock); 1396 unsigned short last; 1397 1398 sa = (struct sockaddr_in *)&transport->addr; 1399 myaddr.sin_addr = sa->sin_addr; 1400 do { 1401 myaddr.sin_port = htons(port); 1402 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1403 sizeof(myaddr)); 1404 if (port == 0) 1405 break; 1406 if (err == 0) { 1407 transport->port = port; 1408 break; 1409 } 1410 last = port; 1411 port = xs_next_srcport(transport, sock, port); 1412 if (port > last) 1413 nloop++; 1414 } while (err == -EADDRINUSE && nloop != 2); 1415 dprintk("RPC: %s %pI4:%u: %s (%d)\n", 1416 __func__, &myaddr.sin_addr, 1417 port, err ? "failed" : "ok", err); 1418 return err; 1419 } 1420 1421 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1422 { 1423 struct sockaddr_in6 myaddr = { 1424 .sin6_family = AF_INET6, 1425 }; 1426 struct sockaddr_in6 *sa; 1427 int err, nloop = 0; 1428 unsigned short port = xs_get_srcport(transport, sock); 1429 unsigned short last; 1430 1431 sa = (struct sockaddr_in6 *)&transport->addr; 1432 myaddr.sin6_addr = sa->sin6_addr; 1433 do { 1434 myaddr.sin6_port = htons(port); 1435 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1436 sizeof(myaddr)); 1437 if (port == 0) 1438 break; 1439 if (err == 0) { 1440 transport->port = port; 1441 break; 1442 } 1443 last = port; 1444 port = xs_next_srcport(transport, sock, port); 1445 if (port > last) 1446 nloop++; 1447 } while (err == -EADDRINUSE && nloop != 2); 1448 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", 1449 &myaddr.sin6_addr, port, err ? "failed" : "ok", err); 1450 return err; 1451 } 1452 1453 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1454 static struct lock_class_key xs_key[2]; 1455 static struct lock_class_key xs_slock_key[2]; 1456 1457 static inline void xs_reclassify_socket4(struct socket *sock) 1458 { 1459 struct sock *sk = sock->sk; 1460 1461 BUG_ON(sock_owned_by_user(sk)); 1462 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1463 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1464 } 1465 1466 static inline void xs_reclassify_socket6(struct socket *sock) 1467 { 1468 struct sock *sk = sock->sk; 1469 1470 BUG_ON(sock_owned_by_user(sk)); 1471 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1472 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1473 } 1474 #else 1475 static inline void xs_reclassify_socket4(struct socket *sock) 1476 { 1477 } 1478 1479 static inline void xs_reclassify_socket6(struct socket *sock) 1480 { 1481 } 1482 #endif 1483 1484 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1485 { 1486 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1487 1488 if (!transport->inet) { 1489 struct sock *sk = sock->sk; 1490 1491 write_lock_bh(&sk->sk_callback_lock); 1492 1493 xs_save_old_callbacks(transport, sk); 1494 1495 sk->sk_user_data = xprt; 1496 sk->sk_data_ready = xs_udp_data_ready; 1497 sk->sk_write_space = xs_udp_write_space; 1498 sk->sk_no_check = UDP_CSUM_NORCV; 1499 sk->sk_allocation = GFP_ATOMIC; 1500 1501 xprt_set_connected(xprt); 1502 1503 /* Reset to new socket */ 1504 transport->sock = sock; 1505 transport->inet = sk; 1506 1507 write_unlock_bh(&sk->sk_callback_lock); 1508 } 1509 xs_udp_do_set_buffer_size(xprt); 1510 } 1511 1512 /** 1513 * xs_udp_connect_worker4 - set up a UDP socket 1514 * @work: RPC transport to connect 1515 * 1516 * Invoked by a work queue tasklet. 1517 */ 1518 static void xs_udp_connect_worker4(struct work_struct *work) 1519 { 1520 struct sock_xprt *transport = 1521 container_of(work, struct sock_xprt, connect_worker.work); 1522 struct rpc_xprt *xprt = &transport->xprt; 1523 struct socket *sock = transport->sock; 1524 int err, status = -EIO; 1525 1526 if (xprt->shutdown || !xprt_bound(xprt)) 1527 goto out; 1528 1529 /* Start by resetting any existing state */ 1530 xs_close(xprt); 1531 1532 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1533 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1534 goto out; 1535 } 1536 xs_reclassify_socket4(sock); 1537 1538 if (xs_bind4(transport, sock)) { 1539 sock_release(sock); 1540 goto out; 1541 } 1542 1543 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1544 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1545 1546 xs_udp_finish_connecting(xprt, sock); 1547 status = 0; 1548 out: 1549 xprt_wake_pending_tasks(xprt, status); 1550 xprt_clear_connecting(xprt); 1551 } 1552 1553 /** 1554 * xs_udp_connect_worker6 - set up a UDP socket 1555 * @work: RPC transport to connect 1556 * 1557 * Invoked by a work queue tasklet. 1558 */ 1559 static void xs_udp_connect_worker6(struct work_struct *work) 1560 { 1561 struct sock_xprt *transport = 1562 container_of(work, struct sock_xprt, connect_worker.work); 1563 struct rpc_xprt *xprt = &transport->xprt; 1564 struct socket *sock = transport->sock; 1565 int err, status = -EIO; 1566 1567 if (xprt->shutdown || !xprt_bound(xprt)) 1568 goto out; 1569 1570 /* Start by resetting any existing state */ 1571 xs_close(xprt); 1572 1573 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1574 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1575 goto out; 1576 } 1577 xs_reclassify_socket6(sock); 1578 1579 if (xs_bind6(transport, sock) < 0) { 1580 sock_release(sock); 1581 goto out; 1582 } 1583 1584 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1585 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1586 1587 xs_udp_finish_connecting(xprt, sock); 1588 status = 0; 1589 out: 1590 xprt_wake_pending_tasks(xprt, status); 1591 xprt_clear_connecting(xprt); 1592 } 1593 1594 /* 1595 * We need to preserve the port number so the reply cache on the server can 1596 * find our cached RPC replies when we get around to reconnecting. 1597 */ 1598 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 1599 { 1600 int result; 1601 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1602 struct sockaddr any; 1603 1604 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1605 1606 /* 1607 * Disconnect the transport socket by doing a connect operation 1608 * with AF_UNSPEC. This should return immediately... 1609 */ 1610 memset(&any, 0, sizeof(any)); 1611 any.sa_family = AF_UNSPEC; 1612 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1613 if (result) 1614 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1615 result); 1616 } 1617 1618 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1619 { 1620 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1621 1622 if (!transport->inet) { 1623 struct sock *sk = sock->sk; 1624 1625 write_lock_bh(&sk->sk_callback_lock); 1626 1627 xs_save_old_callbacks(transport, sk); 1628 1629 sk->sk_user_data = xprt; 1630 sk->sk_data_ready = xs_tcp_data_ready; 1631 sk->sk_state_change = xs_tcp_state_change; 1632 sk->sk_write_space = xs_tcp_write_space; 1633 sk->sk_error_report = xs_tcp_error_report; 1634 sk->sk_allocation = GFP_ATOMIC; 1635 1636 /* socket options */ 1637 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1638 sock_reset_flag(sk, SOCK_LINGER); 1639 tcp_sk(sk)->linger2 = 0; 1640 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1641 1642 xprt_clear_connected(xprt); 1643 1644 /* Reset to new socket */ 1645 transport->sock = sock; 1646 transport->inet = sk; 1647 1648 write_unlock_bh(&sk->sk_callback_lock); 1649 } 1650 1651 /* Tell the socket layer to start connecting... */ 1652 xprt->stat.connect_count++; 1653 xprt->stat.connect_start = jiffies; 1654 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1655 } 1656 1657 /** 1658 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1659 * @work: RPC transport to connect 1660 * 1661 * Invoked by a work queue tasklet. 1662 */ 1663 static void xs_tcp_connect_worker4(struct work_struct *work) 1664 { 1665 struct sock_xprt *transport = 1666 container_of(work, struct sock_xprt, connect_worker.work); 1667 struct rpc_xprt *xprt = &transport->xprt; 1668 struct socket *sock = transport->sock; 1669 int err, status = -EIO; 1670 1671 if (xprt->shutdown || !xprt_bound(xprt)) 1672 goto out; 1673 1674 if (!sock) { 1675 /* start from scratch */ 1676 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1677 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1678 goto out; 1679 } 1680 xs_reclassify_socket4(sock); 1681 1682 if (xs_bind4(transport, sock) < 0) { 1683 sock_release(sock); 1684 goto out; 1685 } 1686 } else 1687 /* "close" the socket, preserving the local port */ 1688 xs_tcp_reuse_connection(xprt); 1689 1690 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1691 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1692 1693 status = xs_tcp_finish_connecting(xprt, sock); 1694 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1695 xprt, -status, xprt_connected(xprt), 1696 sock->sk->sk_state); 1697 if (status < 0) { 1698 switch (status) { 1699 case -EINPROGRESS: 1700 case -EALREADY: 1701 goto out_clear; 1702 case -ECONNREFUSED: 1703 case -ECONNRESET: 1704 /* retry with existing socket, after a delay */ 1705 break; 1706 default: 1707 /* get rid of existing socket, and retry */ 1708 xs_tcp_shutdown(xprt); 1709 } 1710 } 1711 out: 1712 xprt_wake_pending_tasks(xprt, status); 1713 out_clear: 1714 xprt_clear_connecting(xprt); 1715 } 1716 1717 /** 1718 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1719 * @work: RPC transport to connect 1720 * 1721 * Invoked by a work queue tasklet. 1722 */ 1723 static void xs_tcp_connect_worker6(struct work_struct *work) 1724 { 1725 struct sock_xprt *transport = 1726 container_of(work, struct sock_xprt, connect_worker.work); 1727 struct rpc_xprt *xprt = &transport->xprt; 1728 struct socket *sock = transport->sock; 1729 int err, status = -EIO; 1730 1731 if (xprt->shutdown || !xprt_bound(xprt)) 1732 goto out; 1733 1734 if (!sock) { 1735 /* start from scratch */ 1736 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1737 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1738 goto out; 1739 } 1740 xs_reclassify_socket6(sock); 1741 1742 if (xs_bind6(transport, sock) < 0) { 1743 sock_release(sock); 1744 goto out; 1745 } 1746 } else 1747 /* "close" the socket, preserving the local port */ 1748 xs_tcp_reuse_connection(xprt); 1749 1750 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1751 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1752 1753 status = xs_tcp_finish_connecting(xprt, sock); 1754 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1755 xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1756 if (status < 0) { 1757 switch (status) { 1758 case -EINPROGRESS: 1759 case -EALREADY: 1760 goto out_clear; 1761 case -ECONNREFUSED: 1762 case -ECONNRESET: 1763 /* retry with existing socket, after a delay */ 1764 break; 1765 default: 1766 /* get rid of existing socket, and retry */ 1767 xs_tcp_shutdown(xprt); 1768 } 1769 } 1770 out: 1771 xprt_wake_pending_tasks(xprt, status); 1772 out_clear: 1773 xprt_clear_connecting(xprt); 1774 } 1775 1776 /** 1777 * xs_connect - connect a socket to a remote endpoint 1778 * @task: address of RPC task that manages state of connect request 1779 * 1780 * TCP: If the remote end dropped the connection, delay reconnecting. 1781 * 1782 * UDP socket connects are synchronous, but we use a work queue anyway 1783 * to guarantee that even unprivileged user processes can set up a 1784 * socket on a privileged port. 1785 * 1786 * If a UDP socket connect fails, the delay behavior here prevents 1787 * retry floods (hard mounts). 1788 */ 1789 static void xs_connect(struct rpc_task *task) 1790 { 1791 struct rpc_xprt *xprt = task->tk_xprt; 1792 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1793 1794 if (xprt_test_and_set_connecting(xprt)) 1795 return; 1796 1797 if (transport->sock != NULL) { 1798 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1799 "seconds\n", 1800 xprt, xprt->reestablish_timeout / HZ); 1801 queue_delayed_work(rpciod_workqueue, 1802 &transport->connect_worker, 1803 xprt->reestablish_timeout); 1804 xprt->reestablish_timeout <<= 1; 1805 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1806 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1807 } else { 1808 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1809 queue_delayed_work(rpciod_workqueue, 1810 &transport->connect_worker, 0); 1811 } 1812 } 1813 1814 static void xs_tcp_connect(struct rpc_task *task) 1815 { 1816 struct rpc_xprt *xprt = task->tk_xprt; 1817 1818 /* Initiate graceful shutdown of the socket if not already done */ 1819 if (test_bit(XPRT_CONNECTED, &xprt->state)) 1820 xs_tcp_shutdown(xprt); 1821 /* Exit if we need to wait for socket shutdown to complete */ 1822 if (test_bit(XPRT_CLOSING, &xprt->state)) 1823 return; 1824 xs_connect(task); 1825 } 1826 1827 /** 1828 * xs_udp_print_stats - display UDP socket-specifc stats 1829 * @xprt: rpc_xprt struct containing statistics 1830 * @seq: output file 1831 * 1832 */ 1833 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1834 { 1835 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1836 1837 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1838 transport->port, 1839 xprt->stat.bind_count, 1840 xprt->stat.sends, 1841 xprt->stat.recvs, 1842 xprt->stat.bad_xids, 1843 xprt->stat.req_u, 1844 xprt->stat.bklog_u); 1845 } 1846 1847 /** 1848 * xs_tcp_print_stats - display TCP socket-specifc stats 1849 * @xprt: rpc_xprt struct containing statistics 1850 * @seq: output file 1851 * 1852 */ 1853 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1854 { 1855 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1856 long idle_time = 0; 1857 1858 if (xprt_connected(xprt)) 1859 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1860 1861 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1862 transport->port, 1863 xprt->stat.bind_count, 1864 xprt->stat.connect_count, 1865 xprt->stat.connect_time, 1866 idle_time, 1867 xprt->stat.sends, 1868 xprt->stat.recvs, 1869 xprt->stat.bad_xids, 1870 xprt->stat.req_u, 1871 xprt->stat.bklog_u); 1872 } 1873 1874 static struct rpc_xprt_ops xs_udp_ops = { 1875 .set_buffer_size = xs_udp_set_buffer_size, 1876 .reserve_xprt = xprt_reserve_xprt_cong, 1877 .release_xprt = xprt_release_xprt_cong, 1878 .rpcbind = rpcb_getport_async, 1879 .set_port = xs_set_port, 1880 .connect = xs_connect, 1881 .buf_alloc = rpc_malloc, 1882 .buf_free = rpc_free, 1883 .send_request = xs_udp_send_request, 1884 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1885 .timer = xs_udp_timer, 1886 .release_request = xprt_release_rqst_cong, 1887 .close = xs_close, 1888 .destroy = xs_destroy, 1889 .print_stats = xs_udp_print_stats, 1890 }; 1891 1892 static struct rpc_xprt_ops xs_tcp_ops = { 1893 .reserve_xprt = xprt_reserve_xprt, 1894 .release_xprt = xs_tcp_release_xprt, 1895 .rpcbind = rpcb_getport_async, 1896 .set_port = xs_set_port, 1897 .connect = xs_tcp_connect, 1898 .buf_alloc = rpc_malloc, 1899 .buf_free = rpc_free, 1900 .send_request = xs_tcp_send_request, 1901 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1902 .close = xs_tcp_shutdown, 1903 .destroy = xs_destroy, 1904 .print_stats = xs_tcp_print_stats, 1905 }; 1906 1907 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 1908 unsigned int slot_table_size) 1909 { 1910 struct rpc_xprt *xprt; 1911 struct sock_xprt *new; 1912 1913 if (args->addrlen > sizeof(xprt->addr)) { 1914 dprintk("RPC: xs_setup_xprt: address too large\n"); 1915 return ERR_PTR(-EBADF); 1916 } 1917 1918 new = kzalloc(sizeof(*new), GFP_KERNEL); 1919 if (new == NULL) { 1920 dprintk("RPC: xs_setup_xprt: couldn't allocate " 1921 "rpc_xprt\n"); 1922 return ERR_PTR(-ENOMEM); 1923 } 1924 xprt = &new->xprt; 1925 1926 xprt->max_reqs = slot_table_size; 1927 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 1928 if (xprt->slot == NULL) { 1929 kfree(xprt); 1930 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 1931 "table\n"); 1932 return ERR_PTR(-ENOMEM); 1933 } 1934 1935 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 1936 xprt->addrlen = args->addrlen; 1937 if (args->srcaddr) 1938 memcpy(&new->addr, args->srcaddr, args->addrlen); 1939 1940 return xprt; 1941 } 1942 1943 static const struct rpc_timeout xs_udp_default_timeout = { 1944 .to_initval = 5 * HZ, 1945 .to_maxval = 30 * HZ, 1946 .to_increment = 5 * HZ, 1947 .to_retries = 5, 1948 }; 1949 1950 /** 1951 * xs_setup_udp - Set up transport to use a UDP socket 1952 * @args: rpc transport creation arguments 1953 * 1954 */ 1955 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 1956 { 1957 struct sockaddr *addr = args->dstaddr; 1958 struct rpc_xprt *xprt; 1959 struct sock_xprt *transport; 1960 1961 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 1962 if (IS_ERR(xprt)) 1963 return xprt; 1964 transport = container_of(xprt, struct sock_xprt, xprt); 1965 1966 xprt->prot = IPPROTO_UDP; 1967 xprt->tsh_size = 0; 1968 /* XXX: header size can vary due to auth type, IPv6, etc. */ 1969 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1970 1971 xprt->bind_timeout = XS_BIND_TO; 1972 xprt->connect_timeout = XS_UDP_CONN_TO; 1973 xprt->reestablish_timeout = XS_UDP_REEST_TO; 1974 xprt->idle_timeout = XS_IDLE_DISC_TO; 1975 1976 xprt->ops = &xs_udp_ops; 1977 1978 xprt->timeout = &xs_udp_default_timeout; 1979 1980 switch (addr->sa_family) { 1981 case AF_INET: 1982 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1983 xprt_set_bound(xprt); 1984 1985 INIT_DELAYED_WORK(&transport->connect_worker, 1986 xs_udp_connect_worker4); 1987 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 1988 break; 1989 case AF_INET6: 1990 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 1991 xprt_set_bound(xprt); 1992 1993 INIT_DELAYED_WORK(&transport->connect_worker, 1994 xs_udp_connect_worker6); 1995 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 1996 break; 1997 default: 1998 kfree(xprt); 1999 return ERR_PTR(-EAFNOSUPPORT); 2000 } 2001 2002 dprintk("RPC: set up transport to address %s\n", 2003 xprt->address_strings[RPC_DISPLAY_ALL]); 2004 2005 if (try_module_get(THIS_MODULE)) 2006 return xprt; 2007 2008 kfree(xprt->slot); 2009 kfree(xprt); 2010 return ERR_PTR(-EINVAL); 2011 } 2012 2013 static const struct rpc_timeout xs_tcp_default_timeout = { 2014 .to_initval = 60 * HZ, 2015 .to_maxval = 60 * HZ, 2016 .to_retries = 2, 2017 }; 2018 2019 /** 2020 * xs_setup_tcp - Set up transport to use a TCP socket 2021 * @args: rpc transport creation arguments 2022 * 2023 */ 2024 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2025 { 2026 struct sockaddr *addr = args->dstaddr; 2027 struct rpc_xprt *xprt; 2028 struct sock_xprt *transport; 2029 2030 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2031 if (IS_ERR(xprt)) 2032 return xprt; 2033 transport = container_of(xprt, struct sock_xprt, xprt); 2034 2035 xprt->prot = IPPROTO_TCP; 2036 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2037 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2038 2039 xprt->bind_timeout = XS_BIND_TO; 2040 xprt->connect_timeout = XS_TCP_CONN_TO; 2041 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2042 xprt->idle_timeout = XS_IDLE_DISC_TO; 2043 2044 xprt->ops = &xs_tcp_ops; 2045 xprt->timeout = &xs_tcp_default_timeout; 2046 2047 switch (addr->sa_family) { 2048 case AF_INET: 2049 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2050 xprt_set_bound(xprt); 2051 2052 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); 2053 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2054 break; 2055 case AF_INET6: 2056 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2057 xprt_set_bound(xprt); 2058 2059 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); 2060 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2061 break; 2062 default: 2063 kfree(xprt); 2064 return ERR_PTR(-EAFNOSUPPORT); 2065 } 2066 2067 dprintk("RPC: set up transport to address %s\n", 2068 xprt->address_strings[RPC_DISPLAY_ALL]); 2069 2070 if (try_module_get(THIS_MODULE)) 2071 return xprt; 2072 2073 kfree(xprt->slot); 2074 kfree(xprt); 2075 return ERR_PTR(-EINVAL); 2076 } 2077 2078 static struct xprt_class xs_udp_transport = { 2079 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2080 .name = "udp", 2081 .owner = THIS_MODULE, 2082 .ident = IPPROTO_UDP, 2083 .setup = xs_setup_udp, 2084 }; 2085 2086 static struct xprt_class xs_tcp_transport = { 2087 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2088 .name = "tcp", 2089 .owner = THIS_MODULE, 2090 .ident = IPPROTO_TCP, 2091 .setup = xs_setup_tcp, 2092 }; 2093 2094 /** 2095 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2096 * 2097 */ 2098 int init_socket_xprt(void) 2099 { 2100 #ifdef RPC_DEBUG 2101 if (!sunrpc_table_header) 2102 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2103 #endif 2104 2105 xprt_register_transport(&xs_udp_transport); 2106 xprt_register_transport(&xs_tcp_transport); 2107 2108 return 0; 2109 } 2110 2111 /** 2112 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2113 * 2114 */ 2115 void cleanup_socket_xprt(void) 2116 { 2117 #ifdef RPC_DEBUG 2118 if (sunrpc_table_header) { 2119 unregister_sysctl_table(sunrpc_table_header); 2120 sunrpc_table_header = NULL; 2121 } 2122 #endif 2123 2124 xprt_unregister_transport(&xs_udp_transport); 2125 xprt_unregister_transport(&xs_tcp_transport); 2126 } 2127