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 Software <alan@redhat.com> 7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com> 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 * How many times to try sending a request on a socket before waiting 140 * for the socket buffer to clear. 141 */ 142 #define XS_SENDMSG_RETRY (10U) 143 144 /* 145 * Time out for an RPC UDP socket connect. UDP socket connects are 146 * synchronous, but we set a timeout anyway in case of resource 147 * exhaustion on the local host. 148 */ 149 #define XS_UDP_CONN_TO (5U * HZ) 150 151 /* 152 * Wait duration for an RPC TCP connection to be established. Solaris 153 * NFS over TCP uses 60 seconds, for example, which is in line with how 154 * long a server takes to reboot. 155 */ 156 #define XS_TCP_CONN_TO (60U * HZ) 157 158 /* 159 * Wait duration for a reply from the RPC portmapper. 160 */ 161 #define XS_BIND_TO (60U * HZ) 162 163 /* 164 * Delay if a UDP socket connect error occurs. This is most likely some 165 * kind of resource problem on the local host. 166 */ 167 #define XS_UDP_REEST_TO (2U * HZ) 168 169 /* 170 * The reestablish timeout allows clients to delay for a bit before attempting 171 * to reconnect to a server that just dropped our connection. 172 * 173 * We implement an exponential backoff when trying to reestablish a TCP 174 * transport connection with the server. Some servers like to drop a TCP 175 * connection when they are overworked, so we start with a short timeout and 176 * increase over time if the server is down or not responding. 177 */ 178 #define XS_TCP_INIT_REEST_TO (3U * HZ) 179 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 180 181 /* 182 * TCP idle timeout; client drops the transport socket if it is idle 183 * for this long. Note that we also timeout UDP sockets to prevent 184 * holding port numbers when there is no RPC traffic. 185 */ 186 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 187 188 #ifdef RPC_DEBUG 189 # undef RPC_DEBUG_DATA 190 # define RPCDBG_FACILITY RPCDBG_TRANS 191 #endif 192 193 #ifdef RPC_DEBUG_DATA 194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 195 { 196 u8 *buf = (u8 *) packet; 197 int j; 198 199 dprintk("RPC: %s\n", msg); 200 for (j = 0; j < count && j < 128; j += 4) { 201 if (!(j & 31)) { 202 if (j) 203 dprintk("\n"); 204 dprintk("0x%04x ", j); 205 } 206 dprintk("%02x%02x%02x%02x ", 207 buf[j], buf[j+1], buf[j+2], buf[j+3]); 208 } 209 dprintk("\n"); 210 } 211 #else 212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 213 { 214 /* NOP */ 215 } 216 #endif 217 218 struct sock_xprt { 219 struct rpc_xprt xprt; 220 221 /* 222 * Network layer 223 */ 224 struct socket * sock; 225 struct sock * inet; 226 227 /* 228 * State of TCP reply receive 229 */ 230 __be32 tcp_fraghdr, 231 tcp_xid; 232 233 u32 tcp_offset, 234 tcp_reclen; 235 236 unsigned long tcp_copied, 237 tcp_flags; 238 239 /* 240 * Connection of transports 241 */ 242 struct delayed_work connect_worker; 243 struct sockaddr_storage addr; 244 unsigned short port; 245 246 /* 247 * UDP socket buffer size parameters 248 */ 249 size_t rcvsize, 250 sndsize; 251 252 /* 253 * Saved socket callback addresses 254 */ 255 void (*old_data_ready)(struct sock *, int); 256 void (*old_state_change)(struct sock *); 257 void (*old_write_space)(struct sock *); 258 }; 259 260 /* 261 * TCP receive state flags 262 */ 263 #define TCP_RCV_LAST_FRAG (1UL << 0) 264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 265 #define TCP_RCV_COPY_XID (1UL << 2) 266 #define TCP_RCV_COPY_DATA (1UL << 3) 267 268 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 269 { 270 return (struct sockaddr *) &xprt->addr; 271 } 272 273 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 274 { 275 return (struct sockaddr_in *) &xprt->addr; 276 } 277 278 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 279 { 280 return (struct sockaddr_in6 *) &xprt->addr; 281 } 282 283 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt) 284 { 285 struct sockaddr_in *addr = xs_addr_in(xprt); 286 char *buf; 287 288 buf = kzalloc(20, GFP_KERNEL); 289 if (buf) { 290 snprintf(buf, 20, NIPQUAD_FMT, 291 NIPQUAD(addr->sin_addr.s_addr)); 292 } 293 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 294 295 buf = kzalloc(8, GFP_KERNEL); 296 if (buf) { 297 snprintf(buf, 8, "%u", 298 ntohs(addr->sin_port)); 299 } 300 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 301 302 buf = kzalloc(8, GFP_KERNEL); 303 if (buf) { 304 if (xprt->prot == IPPROTO_UDP) 305 snprintf(buf, 8, "udp"); 306 else 307 snprintf(buf, 8, "tcp"); 308 } 309 xprt->address_strings[RPC_DISPLAY_PROTO] = buf; 310 311 buf = kzalloc(48, GFP_KERNEL); 312 if (buf) { 313 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", 314 NIPQUAD(addr->sin_addr.s_addr), 315 ntohs(addr->sin_port), 316 xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); 317 } 318 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 319 320 buf = kzalloc(10, GFP_KERNEL); 321 if (buf) { 322 snprintf(buf, 10, "%02x%02x%02x%02x", 323 NIPQUAD(addr->sin_addr.s_addr)); 324 } 325 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 326 327 buf = kzalloc(8, GFP_KERNEL); 328 if (buf) { 329 snprintf(buf, 8, "%4hx", 330 ntohs(addr->sin_port)); 331 } 332 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 333 334 buf = kzalloc(30, GFP_KERNEL); 335 if (buf) { 336 snprintf(buf, 30, NIPQUAD_FMT".%u.%u", 337 NIPQUAD(addr->sin_addr.s_addr), 338 ntohs(addr->sin_port) >> 8, 339 ntohs(addr->sin_port) & 0xff); 340 } 341 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 342 343 xprt->address_strings[RPC_DISPLAY_NETID] = 344 kstrdup(xprt->prot == IPPROTO_UDP ? 345 RPCBIND_NETID_UDP : RPCBIND_NETID_TCP, GFP_KERNEL); 346 } 347 348 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt) 349 { 350 struct sockaddr_in6 *addr = xs_addr_in6(xprt); 351 char *buf; 352 353 buf = kzalloc(40, GFP_KERNEL); 354 if (buf) { 355 snprintf(buf, 40, NIP6_FMT, 356 NIP6(addr->sin6_addr)); 357 } 358 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 359 360 buf = kzalloc(8, GFP_KERNEL); 361 if (buf) { 362 snprintf(buf, 8, "%u", 363 ntohs(addr->sin6_port)); 364 } 365 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 366 367 buf = kzalloc(8, GFP_KERNEL); 368 if (buf) { 369 if (xprt->prot == IPPROTO_UDP) 370 snprintf(buf, 8, "udp"); 371 else 372 snprintf(buf, 8, "tcp"); 373 } 374 xprt->address_strings[RPC_DISPLAY_PROTO] = buf; 375 376 buf = kzalloc(64, GFP_KERNEL); 377 if (buf) { 378 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s", 379 NIP6(addr->sin6_addr), 380 ntohs(addr->sin6_port), 381 xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); 382 } 383 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 384 385 buf = kzalloc(36, GFP_KERNEL); 386 if (buf) { 387 snprintf(buf, 36, NIP6_SEQFMT, 388 NIP6(addr->sin6_addr)); 389 } 390 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 391 392 buf = kzalloc(8, GFP_KERNEL); 393 if (buf) { 394 snprintf(buf, 8, "%4hx", 395 ntohs(addr->sin6_port)); 396 } 397 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 398 399 buf = kzalloc(50, GFP_KERNEL); 400 if (buf) { 401 snprintf(buf, 50, NIP6_FMT".%u.%u", 402 NIP6(addr->sin6_addr), 403 ntohs(addr->sin6_port) >> 8, 404 ntohs(addr->sin6_port) & 0xff); 405 } 406 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 407 408 xprt->address_strings[RPC_DISPLAY_NETID] = 409 kstrdup(xprt->prot == IPPROTO_UDP ? 410 RPCBIND_NETID_UDP6 : RPCBIND_NETID_TCP6, GFP_KERNEL); 411 } 412 413 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 414 { 415 int i; 416 417 for (i = 0; i < RPC_DISPLAY_MAX; i++) 418 kfree(xprt->address_strings[i]); 419 } 420 421 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 422 423 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 424 { 425 struct msghdr msg = { 426 .msg_name = addr, 427 .msg_namelen = addrlen, 428 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 429 }; 430 struct kvec iov = { 431 .iov_base = vec->iov_base + base, 432 .iov_len = vec->iov_len - base, 433 }; 434 435 if (iov.iov_len != 0) 436 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 437 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 438 } 439 440 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 441 { 442 struct page **ppage; 443 unsigned int remainder; 444 int err, sent = 0; 445 446 remainder = xdr->page_len - base; 447 base += xdr->page_base; 448 ppage = xdr->pages + (base >> PAGE_SHIFT); 449 base &= ~PAGE_MASK; 450 for(;;) { 451 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 452 int flags = XS_SENDMSG_FLAGS; 453 454 remainder -= len; 455 if (remainder != 0 || more) 456 flags |= MSG_MORE; 457 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 458 if (remainder == 0 || err != len) 459 break; 460 sent += err; 461 ppage++; 462 base = 0; 463 } 464 if (sent == 0) 465 return err; 466 if (err > 0) 467 sent += err; 468 return sent; 469 } 470 471 /** 472 * xs_sendpages - write pages directly to a socket 473 * @sock: socket to send on 474 * @addr: UDP only -- address of destination 475 * @addrlen: UDP only -- length of destination address 476 * @xdr: buffer containing this request 477 * @base: starting position in the buffer 478 * 479 */ 480 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 481 { 482 unsigned int remainder = xdr->len - base; 483 int err, sent = 0; 484 485 if (unlikely(!sock)) 486 return -ENOTCONN; 487 488 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 489 if (base != 0) { 490 addr = NULL; 491 addrlen = 0; 492 } 493 494 if (base < xdr->head[0].iov_len || addr != NULL) { 495 unsigned int len = xdr->head[0].iov_len - base; 496 remainder -= len; 497 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 498 if (remainder == 0 || err != len) 499 goto out; 500 sent += err; 501 base = 0; 502 } else 503 base -= xdr->head[0].iov_len; 504 505 if (base < xdr->page_len) { 506 unsigned int len = xdr->page_len - base; 507 remainder -= len; 508 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 509 if (remainder == 0 || err != len) 510 goto out; 511 sent += err; 512 base = 0; 513 } else 514 base -= xdr->page_len; 515 516 if (base >= xdr->tail[0].iov_len) 517 return sent; 518 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 519 out: 520 if (sent == 0) 521 return err; 522 if (err > 0) 523 sent += err; 524 return sent; 525 } 526 527 /** 528 * xs_nospace - place task on wait queue if transmit was incomplete 529 * @task: task to put to sleep 530 * 531 */ 532 static void xs_nospace(struct rpc_task *task) 533 { 534 struct rpc_rqst *req = task->tk_rqstp; 535 struct rpc_xprt *xprt = req->rq_xprt; 536 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 537 538 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 539 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 540 req->rq_slen); 541 542 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 543 /* Protect against races with write_space */ 544 spin_lock_bh(&xprt->transport_lock); 545 546 /* Don't race with disconnect */ 547 if (!xprt_connected(xprt)) 548 task->tk_status = -ENOTCONN; 549 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 550 xprt_wait_for_buffer_space(task); 551 552 spin_unlock_bh(&xprt->transport_lock); 553 } else 554 /* Keep holding the socket if it is blocked */ 555 rpc_delay(task, HZ>>4); 556 } 557 558 /** 559 * xs_udp_send_request - write an RPC request to a UDP socket 560 * @task: address of RPC task that manages the state of an RPC request 561 * 562 * Return values: 563 * 0: The request has been sent 564 * EAGAIN: The socket was blocked, please call again later to 565 * complete the request 566 * ENOTCONN: Caller needs to invoke connect logic then call again 567 * other: Some other error occured, the request was not sent 568 */ 569 static int xs_udp_send_request(struct rpc_task *task) 570 { 571 struct rpc_rqst *req = task->tk_rqstp; 572 struct rpc_xprt *xprt = req->rq_xprt; 573 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 574 struct xdr_buf *xdr = &req->rq_snd_buf; 575 int status; 576 577 xs_pktdump("packet data:", 578 req->rq_svec->iov_base, 579 req->rq_svec->iov_len); 580 581 req->rq_xtime = jiffies; 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 -ENETUNREACH: 600 case -EPIPE: 601 case -ECONNREFUSED: 602 /* When the server has died, an ICMP port unreachable message 603 * prompts ECONNREFUSED. */ 604 break; 605 case -EAGAIN: 606 xs_nospace(task); 607 break; 608 default: 609 dprintk("RPC: sendmsg returned unrecognized error %d\n", 610 -status); 611 break; 612 } 613 614 return status; 615 } 616 617 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 618 { 619 u32 reclen = buf->len - sizeof(rpc_fraghdr); 620 rpc_fraghdr *base = buf->head[0].iov_base; 621 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 622 } 623 624 /** 625 * xs_tcp_send_request - write an RPC request to a TCP socket 626 * @task: address of RPC task that manages the state of an RPC request 627 * 628 * Return values: 629 * 0: The request has been sent 630 * EAGAIN: The socket was blocked, please call again later to 631 * complete the request 632 * ENOTCONN: Caller needs to invoke connect logic then call again 633 * other: Some other error occured, the request was not sent 634 * 635 * XXX: In the case of soft timeouts, should we eventually give up 636 * if sendmsg is not able to make progress? 637 */ 638 static int xs_tcp_send_request(struct rpc_task *task) 639 { 640 struct rpc_rqst *req = task->tk_rqstp; 641 struct rpc_xprt *xprt = req->rq_xprt; 642 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 643 struct xdr_buf *xdr = &req->rq_snd_buf; 644 int status; 645 unsigned int retry = 0; 646 647 xs_encode_tcp_record_marker(&req->rq_snd_buf); 648 649 xs_pktdump("packet data:", 650 req->rq_svec->iov_base, 651 req->rq_svec->iov_len); 652 653 /* Continue transmitting the packet/record. We must be careful 654 * to cope with writespace callbacks arriving _after_ we have 655 * called sendmsg(). */ 656 while (1) { 657 req->rq_xtime = jiffies; 658 status = xs_sendpages(transport->sock, 659 NULL, 0, xdr, req->rq_bytes_sent); 660 661 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 662 xdr->len - req->rq_bytes_sent, status); 663 664 if (unlikely(status < 0)) 665 break; 666 667 /* If we've sent the entire packet, immediately 668 * reset the count of bytes sent. */ 669 req->rq_bytes_sent += status; 670 task->tk_bytes_sent += status; 671 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 672 req->rq_bytes_sent = 0; 673 return 0; 674 } 675 676 status = -EAGAIN; 677 if (retry++ > XS_SENDMSG_RETRY) 678 break; 679 } 680 681 switch (status) { 682 case -EAGAIN: 683 xs_nospace(task); 684 break; 685 case -ECONNREFUSED: 686 case -ECONNRESET: 687 case -ENOTCONN: 688 case -EPIPE: 689 status = -ENOTCONN; 690 break; 691 default: 692 dprintk("RPC: sendmsg returned unrecognized error %d\n", 693 -status); 694 xprt_disconnect(xprt); 695 break; 696 } 697 698 return status; 699 } 700 701 /** 702 * xs_tcp_release_xprt - clean up after a tcp transmission 703 * @xprt: transport 704 * @task: rpc task 705 * 706 * This cleans up if an error causes us to abort the transmission of a request. 707 * In this case, the socket may need to be reset in order to avoid confusing 708 * the server. 709 */ 710 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 711 { 712 struct rpc_rqst *req; 713 714 if (task != xprt->snd_task) 715 return; 716 if (task == NULL) 717 goto out_release; 718 req = task->tk_rqstp; 719 if (req->rq_bytes_sent == 0) 720 goto out_release; 721 if (req->rq_bytes_sent == req->rq_snd_buf.len) 722 goto out_release; 723 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 724 out_release: 725 xprt_release_xprt(xprt, task); 726 } 727 728 /** 729 * xs_close - close a socket 730 * @xprt: transport 731 * 732 * This is used when all requests are complete; ie, no DRC state remains 733 * on the server we want to save. 734 */ 735 static void xs_close(struct rpc_xprt *xprt) 736 { 737 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 738 struct socket *sock = transport->sock; 739 struct sock *sk = transport->inet; 740 741 if (!sk) 742 goto clear_close_wait; 743 744 dprintk("RPC: xs_close xprt %p\n", xprt); 745 746 write_lock_bh(&sk->sk_callback_lock); 747 transport->inet = NULL; 748 transport->sock = NULL; 749 750 sk->sk_user_data = NULL; 751 sk->sk_data_ready = transport->old_data_ready; 752 sk->sk_state_change = transport->old_state_change; 753 sk->sk_write_space = transport->old_write_space; 754 write_unlock_bh(&sk->sk_callback_lock); 755 756 sk->sk_no_check = 0; 757 758 sock_release(sock); 759 clear_close_wait: 760 smp_mb__before_clear_bit(); 761 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 762 smp_mb__after_clear_bit(); 763 } 764 765 /** 766 * xs_destroy - prepare to shutdown a transport 767 * @xprt: doomed transport 768 * 769 */ 770 static void xs_destroy(struct rpc_xprt *xprt) 771 { 772 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 773 774 dprintk("RPC: xs_destroy xprt %p\n", xprt); 775 776 cancel_rearming_delayed_work(&transport->connect_worker); 777 778 xprt_disconnect(xprt); 779 xs_close(xprt); 780 xs_free_peer_addresses(xprt); 781 kfree(xprt->slot); 782 kfree(xprt); 783 module_put(THIS_MODULE); 784 } 785 786 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 787 { 788 return (struct rpc_xprt *) sk->sk_user_data; 789 } 790 791 /** 792 * xs_udp_data_ready - "data ready" callback for UDP sockets 793 * @sk: socket with data to read 794 * @len: how much data to read 795 * 796 */ 797 static void xs_udp_data_ready(struct sock *sk, int len) 798 { 799 struct rpc_task *task; 800 struct rpc_xprt *xprt; 801 struct rpc_rqst *rovr; 802 struct sk_buff *skb; 803 int err, repsize, copied; 804 u32 _xid; 805 __be32 *xp; 806 807 read_lock(&sk->sk_callback_lock); 808 dprintk("RPC: xs_udp_data_ready...\n"); 809 if (!(xprt = xprt_from_sock(sk))) 810 goto out; 811 812 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 813 goto out; 814 815 if (xprt->shutdown) 816 goto dropit; 817 818 repsize = skb->len - sizeof(struct udphdr); 819 if (repsize < 4) { 820 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 821 goto dropit; 822 } 823 824 /* Copy the XID from the skb... */ 825 xp = skb_header_pointer(skb, sizeof(struct udphdr), 826 sizeof(_xid), &_xid); 827 if (xp == NULL) 828 goto dropit; 829 830 /* Look up and lock the request corresponding to the given XID */ 831 spin_lock(&xprt->transport_lock); 832 rovr = xprt_lookup_rqst(xprt, *xp); 833 if (!rovr) 834 goto out_unlock; 835 task = rovr->rq_task; 836 837 if ((copied = rovr->rq_private_buf.buflen) > repsize) 838 copied = repsize; 839 840 /* Suck it into the iovec, verify checksum if not done by hw. */ 841 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) 842 goto out_unlock; 843 844 /* Something worked... */ 845 dst_confirm(skb->dst); 846 847 xprt_adjust_cwnd(task, copied); 848 xprt_update_rtt(task); 849 xprt_complete_rqst(task, copied); 850 851 out_unlock: 852 spin_unlock(&xprt->transport_lock); 853 dropit: 854 skb_free_datagram(sk, skb); 855 out: 856 read_unlock(&sk->sk_callback_lock); 857 } 858 859 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 860 { 861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 862 size_t len, used; 863 char *p; 864 865 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 866 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 867 used = xdr_skb_read_bits(desc, p, len); 868 transport->tcp_offset += used; 869 if (used != len) 870 return; 871 872 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 873 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 874 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 875 else 876 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 877 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 878 879 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 880 transport->tcp_offset = 0; 881 882 /* Sanity check of the record length */ 883 if (unlikely(transport->tcp_reclen < 4)) { 884 dprintk("RPC: invalid TCP record fragment length\n"); 885 xprt_disconnect(xprt); 886 return; 887 } 888 dprintk("RPC: reading TCP record fragment of length %d\n", 889 transport->tcp_reclen); 890 } 891 892 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 893 { 894 if (transport->tcp_offset == transport->tcp_reclen) { 895 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 896 transport->tcp_offset = 0; 897 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 898 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 899 transport->tcp_flags |= TCP_RCV_COPY_XID; 900 transport->tcp_copied = 0; 901 } 902 } 903 } 904 905 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 906 { 907 size_t len, used; 908 char *p; 909 910 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 911 dprintk("RPC: reading XID (%Zu bytes)\n", len); 912 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 913 used = xdr_skb_read_bits(desc, p, len); 914 transport->tcp_offset += used; 915 if (used != len) 916 return; 917 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 918 transport->tcp_flags |= TCP_RCV_COPY_DATA; 919 transport->tcp_copied = 4; 920 dprintk("RPC: reading reply for XID %08x\n", 921 ntohl(transport->tcp_xid)); 922 xs_tcp_check_fraghdr(transport); 923 } 924 925 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 926 { 927 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 928 struct rpc_rqst *req; 929 struct xdr_buf *rcvbuf; 930 size_t len; 931 ssize_t r; 932 933 /* Find and lock the request corresponding to this xid */ 934 spin_lock(&xprt->transport_lock); 935 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 936 if (!req) { 937 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 938 dprintk("RPC: XID %08x request not found!\n", 939 ntohl(transport->tcp_xid)); 940 spin_unlock(&xprt->transport_lock); 941 return; 942 } 943 944 rcvbuf = &req->rq_private_buf; 945 len = desc->count; 946 if (len > transport->tcp_reclen - transport->tcp_offset) { 947 struct xdr_skb_reader my_desc; 948 949 len = transport->tcp_reclen - transport->tcp_offset; 950 memcpy(&my_desc, desc, sizeof(my_desc)); 951 my_desc.count = len; 952 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 953 &my_desc, xdr_skb_read_bits); 954 desc->count -= r; 955 desc->offset += r; 956 } else 957 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 958 desc, xdr_skb_read_bits); 959 960 if (r > 0) { 961 transport->tcp_copied += r; 962 transport->tcp_offset += r; 963 } 964 if (r != len) { 965 /* Error when copying to the receive buffer, 966 * usually because we weren't able to allocate 967 * additional buffer pages. All we can do now 968 * is turn off TCP_RCV_COPY_DATA, so the request 969 * will not receive any additional updates, 970 * and time out. 971 * Any remaining data from this record will 972 * be discarded. 973 */ 974 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 975 dprintk("RPC: XID %08x truncated request\n", 976 ntohl(transport->tcp_xid)); 977 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 978 "tcp_offset = %u, tcp_reclen = %u\n", 979 xprt, transport->tcp_copied, 980 transport->tcp_offset, transport->tcp_reclen); 981 goto out; 982 } 983 984 dprintk("RPC: XID %08x read %Zd bytes\n", 985 ntohl(transport->tcp_xid), r); 986 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 987 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 988 transport->tcp_offset, transport->tcp_reclen); 989 990 if (transport->tcp_copied == req->rq_private_buf.buflen) 991 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 992 else if (transport->tcp_offset == transport->tcp_reclen) { 993 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 994 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 995 } 996 997 out: 998 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 999 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1000 spin_unlock(&xprt->transport_lock); 1001 xs_tcp_check_fraghdr(transport); 1002 } 1003 1004 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1005 { 1006 size_t len; 1007 1008 len = transport->tcp_reclen - transport->tcp_offset; 1009 if (len > desc->count) 1010 len = desc->count; 1011 desc->count -= len; 1012 desc->offset += len; 1013 transport->tcp_offset += len; 1014 dprintk("RPC: discarded %Zu bytes\n", len); 1015 xs_tcp_check_fraghdr(transport); 1016 } 1017 1018 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1019 { 1020 struct rpc_xprt *xprt = rd_desc->arg.data; 1021 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1022 struct xdr_skb_reader desc = { 1023 .skb = skb, 1024 .offset = offset, 1025 .count = len, 1026 }; 1027 1028 dprintk("RPC: xs_tcp_data_recv started\n"); 1029 do { 1030 /* Read in a new fragment marker if necessary */ 1031 /* Can we ever really expect to get completely empty fragments? */ 1032 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1033 xs_tcp_read_fraghdr(xprt, &desc); 1034 continue; 1035 } 1036 /* Read in the xid if necessary */ 1037 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1038 xs_tcp_read_xid(transport, &desc); 1039 continue; 1040 } 1041 /* Read in the request data */ 1042 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1043 xs_tcp_read_request(xprt, &desc); 1044 continue; 1045 } 1046 /* Skip over any trailing bytes on short reads */ 1047 xs_tcp_read_discard(transport, &desc); 1048 } while (desc.count); 1049 dprintk("RPC: xs_tcp_data_recv done\n"); 1050 return len - desc.count; 1051 } 1052 1053 /** 1054 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1055 * @sk: socket with data to read 1056 * @bytes: how much data to read 1057 * 1058 */ 1059 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1060 { 1061 struct rpc_xprt *xprt; 1062 read_descriptor_t rd_desc; 1063 1064 dprintk("RPC: xs_tcp_data_ready...\n"); 1065 1066 read_lock(&sk->sk_callback_lock); 1067 if (!(xprt = xprt_from_sock(sk))) 1068 goto out; 1069 if (xprt->shutdown) 1070 goto out; 1071 1072 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1073 rd_desc.arg.data = xprt; 1074 rd_desc.count = 65536; 1075 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1076 out: 1077 read_unlock(&sk->sk_callback_lock); 1078 } 1079 1080 /** 1081 * xs_tcp_state_change - callback to handle TCP socket state changes 1082 * @sk: socket whose state has changed 1083 * 1084 */ 1085 static void xs_tcp_state_change(struct sock *sk) 1086 { 1087 struct rpc_xprt *xprt; 1088 1089 read_lock(&sk->sk_callback_lock); 1090 if (!(xprt = xprt_from_sock(sk))) 1091 goto out; 1092 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1093 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1094 sk->sk_state, xprt_connected(xprt), 1095 sock_flag(sk, SOCK_DEAD), 1096 sock_flag(sk, SOCK_ZAPPED)); 1097 1098 switch (sk->sk_state) { 1099 case TCP_ESTABLISHED: 1100 spin_lock_bh(&xprt->transport_lock); 1101 if (!xprt_test_and_set_connected(xprt)) { 1102 struct sock_xprt *transport = container_of(xprt, 1103 struct sock_xprt, xprt); 1104 1105 /* Reset TCP record info */ 1106 transport->tcp_offset = 0; 1107 transport->tcp_reclen = 0; 1108 transport->tcp_copied = 0; 1109 transport->tcp_flags = 1110 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1111 1112 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1113 xprt_wake_pending_tasks(xprt, 0); 1114 } 1115 spin_unlock_bh(&xprt->transport_lock); 1116 break; 1117 case TCP_SYN_SENT: 1118 case TCP_SYN_RECV: 1119 break; 1120 case TCP_CLOSE_WAIT: 1121 /* Try to schedule an autoclose RPC calls */ 1122 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 1123 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 1124 queue_work(rpciod_workqueue, &xprt->task_cleanup); 1125 default: 1126 xprt_disconnect(xprt); 1127 } 1128 out: 1129 read_unlock(&sk->sk_callback_lock); 1130 } 1131 1132 /** 1133 * xs_udp_write_space - callback invoked when socket buffer space 1134 * becomes available 1135 * @sk: socket whose state has changed 1136 * 1137 * Called when more output buffer space is available for this socket. 1138 * We try not to wake our writers until they can make "significant" 1139 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1140 * with a bunch of small requests. 1141 */ 1142 static void xs_udp_write_space(struct sock *sk) 1143 { 1144 read_lock(&sk->sk_callback_lock); 1145 1146 /* from net/core/sock.c:sock_def_write_space */ 1147 if (sock_writeable(sk)) { 1148 struct socket *sock; 1149 struct rpc_xprt *xprt; 1150 1151 if (unlikely(!(sock = sk->sk_socket))) 1152 goto out; 1153 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1154 goto out; 1155 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 1156 goto out; 1157 1158 xprt_write_space(xprt); 1159 } 1160 1161 out: 1162 read_unlock(&sk->sk_callback_lock); 1163 } 1164 1165 /** 1166 * xs_tcp_write_space - callback invoked when socket buffer space 1167 * becomes available 1168 * @sk: socket whose state has changed 1169 * 1170 * Called when more output buffer space is available for this socket. 1171 * We try not to wake our writers until they can make "significant" 1172 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1173 * with a bunch of small requests. 1174 */ 1175 static void xs_tcp_write_space(struct sock *sk) 1176 { 1177 read_lock(&sk->sk_callback_lock); 1178 1179 /* from net/core/stream.c:sk_stream_write_space */ 1180 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 1181 struct socket *sock; 1182 struct rpc_xprt *xprt; 1183 1184 if (unlikely(!(sock = sk->sk_socket))) 1185 goto out; 1186 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1187 goto out; 1188 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 1189 goto out; 1190 1191 xprt_write_space(xprt); 1192 } 1193 1194 out: 1195 read_unlock(&sk->sk_callback_lock); 1196 } 1197 1198 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1199 { 1200 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1201 struct sock *sk = transport->inet; 1202 1203 if (transport->rcvsize) { 1204 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1205 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1206 } 1207 if (transport->sndsize) { 1208 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1209 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1210 sk->sk_write_space(sk); 1211 } 1212 } 1213 1214 /** 1215 * xs_udp_set_buffer_size - set send and receive limits 1216 * @xprt: generic transport 1217 * @sndsize: requested size of send buffer, in bytes 1218 * @rcvsize: requested size of receive buffer, in bytes 1219 * 1220 * Set socket send and receive buffer size limits. 1221 */ 1222 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1223 { 1224 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1225 1226 transport->sndsize = 0; 1227 if (sndsize) 1228 transport->sndsize = sndsize + 1024; 1229 transport->rcvsize = 0; 1230 if (rcvsize) 1231 transport->rcvsize = rcvsize + 1024; 1232 1233 xs_udp_do_set_buffer_size(xprt); 1234 } 1235 1236 /** 1237 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1238 * @task: task that timed out 1239 * 1240 * Adjust the congestion window after a retransmit timeout has occurred. 1241 */ 1242 static void xs_udp_timer(struct rpc_task *task) 1243 { 1244 xprt_adjust_cwnd(task, -ETIMEDOUT); 1245 } 1246 1247 static unsigned short xs_get_random_port(void) 1248 { 1249 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1250 unsigned short rand = (unsigned short) net_random() % range; 1251 return rand + xprt_min_resvport; 1252 } 1253 1254 /** 1255 * xs_set_port - reset the port number in the remote endpoint address 1256 * @xprt: generic transport 1257 * @port: new port number 1258 * 1259 */ 1260 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1261 { 1262 struct sockaddr *addr = xs_addr(xprt); 1263 1264 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1265 1266 switch (addr->sa_family) { 1267 case AF_INET: 1268 ((struct sockaddr_in *)addr)->sin_port = htons(port); 1269 break; 1270 case AF_INET6: 1271 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); 1272 break; 1273 default: 1274 BUG(); 1275 } 1276 } 1277 1278 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1279 { 1280 struct sockaddr_in myaddr = { 1281 .sin_family = AF_INET, 1282 }; 1283 struct sockaddr_in *sa; 1284 int err; 1285 unsigned short port = transport->port; 1286 1287 if (!transport->xprt.resvport) 1288 port = 0; 1289 sa = (struct sockaddr_in *)&transport->addr; 1290 myaddr.sin_addr = sa->sin_addr; 1291 do { 1292 myaddr.sin_port = htons(port); 1293 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1294 sizeof(myaddr)); 1295 if (!transport->xprt.resvport) 1296 break; 1297 if (err == 0) { 1298 transport->port = port; 1299 break; 1300 } 1301 if (port <= xprt_min_resvport) 1302 port = xprt_max_resvport; 1303 else 1304 port--; 1305 } while (err == -EADDRINUSE && port != transport->port); 1306 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n", 1307 __FUNCTION__, NIPQUAD(myaddr.sin_addr), 1308 port, err ? "failed" : "ok", err); 1309 return err; 1310 } 1311 1312 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1313 { 1314 struct sockaddr_in6 myaddr = { 1315 .sin6_family = AF_INET6, 1316 }; 1317 struct sockaddr_in6 *sa; 1318 int err; 1319 unsigned short port = transport->port; 1320 1321 if (!transport->xprt.resvport) 1322 port = 0; 1323 sa = (struct sockaddr_in6 *)&transport->addr; 1324 myaddr.sin6_addr = sa->sin6_addr; 1325 do { 1326 myaddr.sin6_port = htons(port); 1327 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1328 sizeof(myaddr)); 1329 if (!transport->xprt.resvport) 1330 break; 1331 if (err == 0) { 1332 transport->port = port; 1333 break; 1334 } 1335 if (port <= xprt_min_resvport) 1336 port = xprt_max_resvport; 1337 else 1338 port--; 1339 } while (err == -EADDRINUSE && port != transport->port); 1340 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n", 1341 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err); 1342 return err; 1343 } 1344 1345 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1346 static struct lock_class_key xs_key[2]; 1347 static struct lock_class_key xs_slock_key[2]; 1348 1349 static inline void xs_reclassify_socket4(struct socket *sock) 1350 { 1351 struct sock *sk = sock->sk; 1352 1353 BUG_ON(sock_owned_by_user(sk)); 1354 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1355 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1356 } 1357 1358 static inline void xs_reclassify_socket6(struct socket *sock) 1359 { 1360 struct sock *sk = sock->sk; 1361 1362 BUG_ON(sock_owned_by_user(sk)); 1363 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1364 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1365 } 1366 #else 1367 static inline void xs_reclassify_socket4(struct socket *sock) 1368 { 1369 } 1370 1371 static inline void xs_reclassify_socket6(struct socket *sock) 1372 { 1373 } 1374 #endif 1375 1376 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1377 { 1378 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1379 1380 if (!transport->inet) { 1381 struct sock *sk = sock->sk; 1382 1383 write_lock_bh(&sk->sk_callback_lock); 1384 1385 sk->sk_user_data = xprt; 1386 transport->old_data_ready = sk->sk_data_ready; 1387 transport->old_state_change = sk->sk_state_change; 1388 transport->old_write_space = sk->sk_write_space; 1389 sk->sk_data_ready = xs_udp_data_ready; 1390 sk->sk_write_space = xs_udp_write_space; 1391 sk->sk_no_check = UDP_CSUM_NORCV; 1392 sk->sk_allocation = GFP_ATOMIC; 1393 1394 xprt_set_connected(xprt); 1395 1396 /* Reset to new socket */ 1397 transport->sock = sock; 1398 transport->inet = sk; 1399 1400 write_unlock_bh(&sk->sk_callback_lock); 1401 } 1402 xs_udp_do_set_buffer_size(xprt); 1403 } 1404 1405 /** 1406 * xs_udp_connect_worker4 - set up a UDP socket 1407 * @work: RPC transport to connect 1408 * 1409 * Invoked by a work queue tasklet. 1410 */ 1411 static void xs_udp_connect_worker4(struct work_struct *work) 1412 { 1413 struct sock_xprt *transport = 1414 container_of(work, struct sock_xprt, connect_worker.work); 1415 struct rpc_xprt *xprt = &transport->xprt; 1416 struct socket *sock = transport->sock; 1417 int err, status = -EIO; 1418 1419 if (xprt->shutdown || !xprt_bound(xprt)) 1420 goto out; 1421 1422 /* Start by resetting any existing state */ 1423 xs_close(xprt); 1424 1425 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1426 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1427 goto out; 1428 } 1429 xs_reclassify_socket4(sock); 1430 1431 if (xs_bind4(transport, sock)) { 1432 sock_release(sock); 1433 goto out; 1434 } 1435 1436 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1437 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1438 1439 xs_udp_finish_connecting(xprt, sock); 1440 status = 0; 1441 out: 1442 xprt_wake_pending_tasks(xprt, status); 1443 xprt_clear_connecting(xprt); 1444 } 1445 1446 /** 1447 * xs_udp_connect_worker6 - set up a UDP socket 1448 * @work: RPC transport to connect 1449 * 1450 * Invoked by a work queue tasklet. 1451 */ 1452 static void xs_udp_connect_worker6(struct work_struct *work) 1453 { 1454 struct sock_xprt *transport = 1455 container_of(work, struct sock_xprt, connect_worker.work); 1456 struct rpc_xprt *xprt = &transport->xprt; 1457 struct socket *sock = transport->sock; 1458 int err, status = -EIO; 1459 1460 if (xprt->shutdown || !xprt_bound(xprt)) 1461 goto out; 1462 1463 /* Start by resetting any existing state */ 1464 xs_close(xprt); 1465 1466 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1467 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1468 goto out; 1469 } 1470 xs_reclassify_socket6(sock); 1471 1472 if (xs_bind6(transport, sock) < 0) { 1473 sock_release(sock); 1474 goto out; 1475 } 1476 1477 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1478 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1479 1480 xs_udp_finish_connecting(xprt, sock); 1481 status = 0; 1482 out: 1483 xprt_wake_pending_tasks(xprt, status); 1484 xprt_clear_connecting(xprt); 1485 } 1486 1487 /* 1488 * We need to preserve the port number so the reply cache on the server can 1489 * find our cached RPC replies when we get around to reconnecting. 1490 */ 1491 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 1492 { 1493 int result; 1494 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1495 struct sockaddr any; 1496 1497 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1498 1499 /* 1500 * Disconnect the transport socket by doing a connect operation 1501 * with AF_UNSPEC. This should return immediately... 1502 */ 1503 memset(&any, 0, sizeof(any)); 1504 any.sa_family = AF_UNSPEC; 1505 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1506 if (result) 1507 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1508 result); 1509 } 1510 1511 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1512 { 1513 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1514 1515 if (!transport->inet) { 1516 struct sock *sk = sock->sk; 1517 1518 write_lock_bh(&sk->sk_callback_lock); 1519 1520 sk->sk_user_data = xprt; 1521 transport->old_data_ready = sk->sk_data_ready; 1522 transport->old_state_change = sk->sk_state_change; 1523 transport->old_write_space = sk->sk_write_space; 1524 sk->sk_data_ready = xs_tcp_data_ready; 1525 sk->sk_state_change = xs_tcp_state_change; 1526 sk->sk_write_space = xs_tcp_write_space; 1527 sk->sk_allocation = GFP_ATOMIC; 1528 1529 /* socket options */ 1530 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1531 sock_reset_flag(sk, SOCK_LINGER); 1532 tcp_sk(sk)->linger2 = 0; 1533 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1534 1535 xprt_clear_connected(xprt); 1536 1537 /* Reset to new socket */ 1538 transport->sock = sock; 1539 transport->inet = sk; 1540 1541 write_unlock_bh(&sk->sk_callback_lock); 1542 } 1543 1544 /* Tell the socket layer to start connecting... */ 1545 xprt->stat.connect_count++; 1546 xprt->stat.connect_start = jiffies; 1547 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1548 } 1549 1550 /** 1551 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1552 * @work: RPC transport to connect 1553 * 1554 * Invoked by a work queue tasklet. 1555 */ 1556 static void xs_tcp_connect_worker4(struct work_struct *work) 1557 { 1558 struct sock_xprt *transport = 1559 container_of(work, struct sock_xprt, connect_worker.work); 1560 struct rpc_xprt *xprt = &transport->xprt; 1561 struct socket *sock = transport->sock; 1562 int err, status = -EIO; 1563 1564 if (xprt->shutdown || !xprt_bound(xprt)) 1565 goto out; 1566 1567 if (!sock) { 1568 /* start from scratch */ 1569 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1570 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1571 goto out; 1572 } 1573 xs_reclassify_socket4(sock); 1574 1575 if (xs_bind4(transport, sock) < 0) { 1576 sock_release(sock); 1577 goto out; 1578 } 1579 } else 1580 /* "close" the socket, preserving the local port */ 1581 xs_tcp_reuse_connection(xprt); 1582 1583 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1584 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1585 1586 status = xs_tcp_finish_connecting(xprt, sock); 1587 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1588 xprt, -status, xprt_connected(xprt), 1589 sock->sk->sk_state); 1590 if (status < 0) { 1591 switch (status) { 1592 case -EINPROGRESS: 1593 case -EALREADY: 1594 goto out_clear; 1595 case -ECONNREFUSED: 1596 case -ECONNRESET: 1597 /* retry with existing socket, after a delay */ 1598 break; 1599 default: 1600 /* get rid of existing socket, and retry */ 1601 xs_close(xprt); 1602 break; 1603 } 1604 } 1605 out: 1606 xprt_wake_pending_tasks(xprt, status); 1607 out_clear: 1608 xprt_clear_connecting(xprt); 1609 } 1610 1611 /** 1612 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1613 * @work: RPC transport to connect 1614 * 1615 * Invoked by a work queue tasklet. 1616 */ 1617 static void xs_tcp_connect_worker6(struct work_struct *work) 1618 { 1619 struct sock_xprt *transport = 1620 container_of(work, struct sock_xprt, connect_worker.work); 1621 struct rpc_xprt *xprt = &transport->xprt; 1622 struct socket *sock = transport->sock; 1623 int err, status = -EIO; 1624 1625 if (xprt->shutdown || !xprt_bound(xprt)) 1626 goto out; 1627 1628 if (!sock) { 1629 /* start from scratch */ 1630 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1631 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1632 goto out; 1633 } 1634 xs_reclassify_socket6(sock); 1635 1636 if (xs_bind6(transport, sock) < 0) { 1637 sock_release(sock); 1638 goto out; 1639 } 1640 } else 1641 /* "close" the socket, preserving the local port */ 1642 xs_tcp_reuse_connection(xprt); 1643 1644 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1645 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1646 1647 status = xs_tcp_finish_connecting(xprt, sock); 1648 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1649 xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1650 if (status < 0) { 1651 switch (status) { 1652 case -EINPROGRESS: 1653 case -EALREADY: 1654 goto out_clear; 1655 case -ECONNREFUSED: 1656 case -ECONNRESET: 1657 /* retry with existing socket, after a delay */ 1658 break; 1659 default: 1660 /* get rid of existing socket, and retry */ 1661 xs_close(xprt); 1662 break; 1663 } 1664 } 1665 out: 1666 xprt_wake_pending_tasks(xprt, status); 1667 out_clear: 1668 xprt_clear_connecting(xprt); 1669 } 1670 1671 /** 1672 * xs_connect - connect a socket to a remote endpoint 1673 * @task: address of RPC task that manages state of connect request 1674 * 1675 * TCP: If the remote end dropped the connection, delay reconnecting. 1676 * 1677 * UDP socket connects are synchronous, but we use a work queue anyway 1678 * to guarantee that even unprivileged user processes can set up a 1679 * socket on a privileged port. 1680 * 1681 * If a UDP socket connect fails, the delay behavior here prevents 1682 * retry floods (hard mounts). 1683 */ 1684 static void xs_connect(struct rpc_task *task) 1685 { 1686 struct rpc_xprt *xprt = task->tk_xprt; 1687 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1688 1689 if (xprt_test_and_set_connecting(xprt)) 1690 return; 1691 1692 if (transport->sock != NULL) { 1693 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1694 "seconds\n", 1695 xprt, xprt->reestablish_timeout / HZ); 1696 queue_delayed_work(rpciod_workqueue, 1697 &transport->connect_worker, 1698 xprt->reestablish_timeout); 1699 xprt->reestablish_timeout <<= 1; 1700 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1701 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1702 } else { 1703 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1704 queue_delayed_work(rpciod_workqueue, 1705 &transport->connect_worker, 0); 1706 } 1707 } 1708 1709 /** 1710 * xs_udp_print_stats - display UDP socket-specifc stats 1711 * @xprt: rpc_xprt struct containing statistics 1712 * @seq: output file 1713 * 1714 */ 1715 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1716 { 1717 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1718 1719 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1720 transport->port, 1721 xprt->stat.bind_count, 1722 xprt->stat.sends, 1723 xprt->stat.recvs, 1724 xprt->stat.bad_xids, 1725 xprt->stat.req_u, 1726 xprt->stat.bklog_u); 1727 } 1728 1729 /** 1730 * xs_tcp_print_stats - display TCP socket-specifc stats 1731 * @xprt: rpc_xprt struct containing statistics 1732 * @seq: output file 1733 * 1734 */ 1735 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1736 { 1737 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1738 long idle_time = 0; 1739 1740 if (xprt_connected(xprt)) 1741 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1742 1743 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1744 transport->port, 1745 xprt->stat.bind_count, 1746 xprt->stat.connect_count, 1747 xprt->stat.connect_time, 1748 idle_time, 1749 xprt->stat.sends, 1750 xprt->stat.recvs, 1751 xprt->stat.bad_xids, 1752 xprt->stat.req_u, 1753 xprt->stat.bklog_u); 1754 } 1755 1756 static struct rpc_xprt_ops xs_udp_ops = { 1757 .set_buffer_size = xs_udp_set_buffer_size, 1758 .reserve_xprt = xprt_reserve_xprt_cong, 1759 .release_xprt = xprt_release_xprt_cong, 1760 .rpcbind = rpcb_getport_async, 1761 .set_port = xs_set_port, 1762 .connect = xs_connect, 1763 .buf_alloc = rpc_malloc, 1764 .buf_free = rpc_free, 1765 .send_request = xs_udp_send_request, 1766 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1767 .timer = xs_udp_timer, 1768 .release_request = xprt_release_rqst_cong, 1769 .close = xs_close, 1770 .destroy = xs_destroy, 1771 .print_stats = xs_udp_print_stats, 1772 }; 1773 1774 static struct rpc_xprt_ops xs_tcp_ops = { 1775 .reserve_xprt = xprt_reserve_xprt, 1776 .release_xprt = xs_tcp_release_xprt, 1777 .rpcbind = rpcb_getport_async, 1778 .set_port = xs_set_port, 1779 .connect = xs_connect, 1780 .buf_alloc = rpc_malloc, 1781 .buf_free = rpc_free, 1782 .send_request = xs_tcp_send_request, 1783 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1784 .close = xs_close, 1785 .destroy = xs_destroy, 1786 .print_stats = xs_tcp_print_stats, 1787 }; 1788 1789 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 1790 unsigned int slot_table_size) 1791 { 1792 struct rpc_xprt *xprt; 1793 struct sock_xprt *new; 1794 1795 if (args->addrlen > sizeof(xprt->addr)) { 1796 dprintk("RPC: xs_setup_xprt: address too large\n"); 1797 return ERR_PTR(-EBADF); 1798 } 1799 1800 new = kzalloc(sizeof(*new), GFP_KERNEL); 1801 if (new == NULL) { 1802 dprintk("RPC: xs_setup_xprt: couldn't allocate " 1803 "rpc_xprt\n"); 1804 return ERR_PTR(-ENOMEM); 1805 } 1806 xprt = &new->xprt; 1807 1808 xprt->max_reqs = slot_table_size; 1809 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 1810 if (xprt->slot == NULL) { 1811 kfree(xprt); 1812 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 1813 "table\n"); 1814 return ERR_PTR(-ENOMEM); 1815 } 1816 1817 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 1818 xprt->addrlen = args->addrlen; 1819 if (args->srcaddr) 1820 memcpy(&new->addr, args->srcaddr, args->addrlen); 1821 new->port = xs_get_random_port(); 1822 1823 return xprt; 1824 } 1825 1826 /** 1827 * xs_setup_udp - Set up transport to use a UDP socket 1828 * @args: rpc transport creation arguments 1829 * 1830 */ 1831 struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 1832 { 1833 struct sockaddr *addr = args->dstaddr; 1834 struct rpc_xprt *xprt; 1835 struct sock_xprt *transport; 1836 1837 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 1838 if (IS_ERR(xprt)) 1839 return xprt; 1840 transport = container_of(xprt, struct sock_xprt, xprt); 1841 1842 xprt->prot = IPPROTO_UDP; 1843 xprt->tsh_size = 0; 1844 /* XXX: header size can vary due to auth type, IPv6, etc. */ 1845 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1846 1847 xprt->bind_timeout = XS_BIND_TO; 1848 xprt->connect_timeout = XS_UDP_CONN_TO; 1849 xprt->reestablish_timeout = XS_UDP_REEST_TO; 1850 xprt->idle_timeout = XS_IDLE_DISC_TO; 1851 1852 xprt->ops = &xs_udp_ops; 1853 1854 if (args->timeout) 1855 xprt->timeout = *args->timeout; 1856 else 1857 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); 1858 1859 switch (addr->sa_family) { 1860 case AF_INET: 1861 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1862 xprt_set_bound(xprt); 1863 1864 INIT_DELAYED_WORK(&transport->connect_worker, 1865 xs_udp_connect_worker4); 1866 xs_format_ipv4_peer_addresses(xprt); 1867 break; 1868 case AF_INET6: 1869 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 1870 xprt_set_bound(xprt); 1871 1872 INIT_DELAYED_WORK(&transport->connect_worker, 1873 xs_udp_connect_worker6); 1874 xs_format_ipv6_peer_addresses(xprt); 1875 break; 1876 default: 1877 kfree(xprt); 1878 return ERR_PTR(-EAFNOSUPPORT); 1879 } 1880 1881 dprintk("RPC: set up transport to address %s\n", 1882 xprt->address_strings[RPC_DISPLAY_ALL]); 1883 1884 if (try_module_get(THIS_MODULE)) 1885 return xprt; 1886 1887 kfree(xprt->slot); 1888 kfree(xprt); 1889 return ERR_PTR(-EINVAL); 1890 } 1891 1892 /** 1893 * xs_setup_tcp - Set up transport to use a TCP socket 1894 * @args: rpc transport creation arguments 1895 * 1896 */ 1897 struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 1898 { 1899 struct sockaddr *addr = args->dstaddr; 1900 struct rpc_xprt *xprt; 1901 struct sock_xprt *transport; 1902 1903 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 1904 if (IS_ERR(xprt)) 1905 return xprt; 1906 transport = container_of(xprt, struct sock_xprt, xprt); 1907 1908 xprt->prot = IPPROTO_TCP; 1909 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 1910 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 1911 1912 xprt->bind_timeout = XS_BIND_TO; 1913 xprt->connect_timeout = XS_TCP_CONN_TO; 1914 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1915 xprt->idle_timeout = XS_IDLE_DISC_TO; 1916 1917 xprt->ops = &xs_tcp_ops; 1918 1919 if (args->timeout) 1920 xprt->timeout = *args->timeout; 1921 else 1922 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); 1923 1924 switch (addr->sa_family) { 1925 case AF_INET: 1926 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1927 xprt_set_bound(xprt); 1928 1929 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); 1930 xs_format_ipv4_peer_addresses(xprt); 1931 break; 1932 case AF_INET6: 1933 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 1934 xprt_set_bound(xprt); 1935 1936 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); 1937 xs_format_ipv6_peer_addresses(xprt); 1938 break; 1939 default: 1940 kfree(xprt); 1941 return ERR_PTR(-EAFNOSUPPORT); 1942 } 1943 1944 dprintk("RPC: set up transport to address %s\n", 1945 xprt->address_strings[RPC_DISPLAY_ALL]); 1946 1947 if (try_module_get(THIS_MODULE)) 1948 return xprt; 1949 1950 kfree(xprt->slot); 1951 kfree(xprt); 1952 return ERR_PTR(-EINVAL); 1953 } 1954 1955 static struct xprt_class xs_udp_transport = { 1956 .list = LIST_HEAD_INIT(xs_udp_transport.list), 1957 .name = "udp", 1958 .owner = THIS_MODULE, 1959 .ident = IPPROTO_UDP, 1960 .setup = xs_setup_udp, 1961 }; 1962 1963 static struct xprt_class xs_tcp_transport = { 1964 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 1965 .name = "tcp", 1966 .owner = THIS_MODULE, 1967 .ident = IPPROTO_TCP, 1968 .setup = xs_setup_tcp, 1969 }; 1970 1971 /** 1972 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 1973 * 1974 */ 1975 int init_socket_xprt(void) 1976 { 1977 #ifdef RPC_DEBUG 1978 if (!sunrpc_table_header) 1979 sunrpc_table_header = register_sysctl_table(sunrpc_table); 1980 #endif 1981 1982 xprt_register_transport(&xs_udp_transport); 1983 xprt_register_transport(&xs_tcp_transport); 1984 1985 return 0; 1986 } 1987 1988 /** 1989 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 1990 * 1991 */ 1992 void cleanup_socket_xprt(void) 1993 { 1994 #ifdef RPC_DEBUG 1995 if (sunrpc_table_header) { 1996 unregister_sysctl_table(sunrpc_table_header); 1997 sunrpc_table_header = NULL; 1998 } 1999 #endif 2000 2001 xprt_unregister_transport(&xs_udp_transport); 2002 xprt_unregister_transport(&xs_tcp_transport); 2003 } 2004