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, NIPQUAD_FMT, 288 NIPQUAD(addr->sin_addr.s_addr)); 289 } 290 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 291 292 buf = kzalloc(8, GFP_KERNEL); 293 if (buf) { 294 snprintf(buf, 8, "%u", 295 ntohs(addr->sin_port)); 296 } 297 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 298 299 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 300 301 buf = kzalloc(48, GFP_KERNEL); 302 if (buf) { 303 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", 304 NIPQUAD(addr->sin_addr.s_addr), 305 ntohs(addr->sin_port), 306 protocol); 307 } 308 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 309 310 buf = kzalloc(10, GFP_KERNEL); 311 if (buf) { 312 snprintf(buf, 10, "%02x%02x%02x%02x", 313 NIPQUAD(addr->sin_addr.s_addr)); 314 } 315 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 316 317 buf = kzalloc(8, GFP_KERNEL); 318 if (buf) { 319 snprintf(buf, 8, "%4hx", 320 ntohs(addr->sin_port)); 321 } 322 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 323 324 buf = kzalloc(30, GFP_KERNEL); 325 if (buf) { 326 snprintf(buf, 30, NIPQUAD_FMT".%u.%u", 327 NIPQUAD(addr->sin_addr.s_addr), 328 ntohs(addr->sin_port) >> 8, 329 ntohs(addr->sin_port) & 0xff); 330 } 331 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 332 333 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 334 } 335 336 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, 337 const char *protocol, 338 const char *netid) 339 { 340 struct sockaddr_in6 *addr = xs_addr_in6(xprt); 341 char *buf; 342 343 buf = kzalloc(40, GFP_KERNEL); 344 if (buf) { 345 snprintf(buf, 40, NIP6_FMT, 346 NIP6(addr->sin6_addr)); 347 } 348 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 349 350 buf = kzalloc(8, GFP_KERNEL); 351 if (buf) { 352 snprintf(buf, 8, "%u", 353 ntohs(addr->sin6_port)); 354 } 355 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 356 357 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 358 359 buf = kzalloc(64, GFP_KERNEL); 360 if (buf) { 361 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s", 362 NIP6(addr->sin6_addr), 363 ntohs(addr->sin6_port), 364 protocol); 365 } 366 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 367 368 buf = kzalloc(36, GFP_KERNEL); 369 if (buf) { 370 snprintf(buf, 36, NIP6_SEQFMT, 371 NIP6(addr->sin6_addr)); 372 } 373 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 374 375 buf = kzalloc(8, GFP_KERNEL); 376 if (buf) { 377 snprintf(buf, 8, "%4hx", 378 ntohs(addr->sin6_port)); 379 } 380 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 381 382 buf = kzalloc(50, GFP_KERNEL); 383 if (buf) { 384 snprintf(buf, 50, NIP6_FMT".%u.%u", 385 NIP6(addr->sin6_addr), 386 ntohs(addr->sin6_port) >> 8, 387 ntohs(addr->sin6_port) & 0xff); 388 } 389 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 390 391 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 392 } 393 394 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 395 { 396 unsigned int i; 397 398 for (i = 0; i < RPC_DISPLAY_MAX; i++) 399 switch (i) { 400 case RPC_DISPLAY_PROTO: 401 case RPC_DISPLAY_NETID: 402 continue; 403 default: 404 kfree(xprt->address_strings[i]); 405 } 406 } 407 408 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 409 410 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 411 { 412 struct msghdr msg = { 413 .msg_name = addr, 414 .msg_namelen = addrlen, 415 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 416 }; 417 struct kvec iov = { 418 .iov_base = vec->iov_base + base, 419 .iov_len = vec->iov_len - base, 420 }; 421 422 if (iov.iov_len != 0) 423 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 424 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 425 } 426 427 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 428 { 429 struct page **ppage; 430 unsigned int remainder; 431 int err, sent = 0; 432 433 remainder = xdr->page_len - base; 434 base += xdr->page_base; 435 ppage = xdr->pages + (base >> PAGE_SHIFT); 436 base &= ~PAGE_MASK; 437 for(;;) { 438 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 439 int flags = XS_SENDMSG_FLAGS; 440 441 remainder -= len; 442 if (remainder != 0 || more) 443 flags |= MSG_MORE; 444 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 445 if (remainder == 0 || err != len) 446 break; 447 sent += err; 448 ppage++; 449 base = 0; 450 } 451 if (sent == 0) 452 return err; 453 if (err > 0) 454 sent += err; 455 return sent; 456 } 457 458 /** 459 * xs_sendpages - write pages directly to a socket 460 * @sock: socket to send on 461 * @addr: UDP only -- address of destination 462 * @addrlen: UDP only -- length of destination address 463 * @xdr: buffer containing this request 464 * @base: starting position in the buffer 465 * 466 */ 467 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 468 { 469 unsigned int remainder = xdr->len - base; 470 int err, sent = 0; 471 472 if (unlikely(!sock)) 473 return -ENOTCONN; 474 475 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 476 if (base != 0) { 477 addr = NULL; 478 addrlen = 0; 479 } 480 481 if (base < xdr->head[0].iov_len || addr != NULL) { 482 unsigned int len = xdr->head[0].iov_len - base; 483 remainder -= len; 484 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 485 if (remainder == 0 || err != len) 486 goto out; 487 sent += err; 488 base = 0; 489 } else 490 base -= xdr->head[0].iov_len; 491 492 if (base < xdr->page_len) { 493 unsigned int len = xdr->page_len - base; 494 remainder -= len; 495 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 496 if (remainder == 0 || err != len) 497 goto out; 498 sent += err; 499 base = 0; 500 } else 501 base -= xdr->page_len; 502 503 if (base >= xdr->tail[0].iov_len) 504 return sent; 505 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 506 out: 507 if (sent == 0) 508 return err; 509 if (err > 0) 510 sent += err; 511 return sent; 512 } 513 514 static void xs_nospace_callback(struct rpc_task *task) 515 { 516 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 517 518 transport->inet->sk_write_pending--; 519 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 520 } 521 522 /** 523 * xs_nospace - place task on wait queue if transmit was incomplete 524 * @task: task to put to sleep 525 * 526 */ 527 static void xs_nospace(struct rpc_task *task) 528 { 529 struct rpc_rqst *req = task->tk_rqstp; 530 struct rpc_xprt *xprt = req->rq_xprt; 531 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 532 533 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 534 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 535 req->rq_slen); 536 537 /* Protect against races with write_space */ 538 spin_lock_bh(&xprt->transport_lock); 539 540 /* Don't race with disconnect */ 541 if (xprt_connected(xprt)) { 542 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 543 /* 544 * Notify TCP that we're limited by the application 545 * window size 546 */ 547 set_bit(SOCK_NOSPACE, &transport->sock->flags); 548 transport->inet->sk_write_pending++; 549 /* ...and wait for more buffer space */ 550 xprt_wait_for_buffer_space(task, xs_nospace_callback); 551 } 552 } else { 553 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 554 task->tk_status = -ENOTCONN; 555 } 556 557 spin_unlock_bh(&xprt->transport_lock); 558 } 559 560 /** 561 * xs_udp_send_request - write an RPC request to a UDP socket 562 * @task: address of RPC task that manages the state of an RPC request 563 * 564 * Return values: 565 * 0: The request has been sent 566 * EAGAIN: The socket was blocked, please call again later to 567 * complete the request 568 * ENOTCONN: Caller needs to invoke connect logic then call again 569 * other: Some other error occured, the request was not sent 570 */ 571 static int xs_udp_send_request(struct rpc_task *task) 572 { 573 struct rpc_rqst *req = task->tk_rqstp; 574 struct rpc_xprt *xprt = req->rq_xprt; 575 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 576 struct xdr_buf *xdr = &req->rq_snd_buf; 577 int status; 578 579 xs_pktdump("packet data:", 580 req->rq_svec->iov_base, 581 req->rq_svec->iov_len); 582 583 status = xs_sendpages(transport->sock, 584 xs_addr(xprt), 585 xprt->addrlen, xdr, 586 req->rq_bytes_sent); 587 588 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 589 xdr->len - req->rq_bytes_sent, status); 590 591 if (status >= 0) { 592 task->tk_bytes_sent += status; 593 if (status >= req->rq_slen) 594 return 0; 595 /* Still some bytes left; set up for a retry later. */ 596 status = -EAGAIN; 597 } 598 599 switch (status) { 600 case -EAGAIN: 601 xs_nospace(task); 602 break; 603 case -ENETUNREACH: 604 case -EPIPE: 605 case -ECONNREFUSED: 606 /* When the server has died, an ICMP port unreachable message 607 * prompts ECONNREFUSED. */ 608 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 609 break; 610 default: 611 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 612 dprintk("RPC: sendmsg returned unrecognized error %d\n", 613 -status); 614 } 615 616 return status; 617 } 618 619 /** 620 * xs_tcp_shutdown - gracefully shut down a TCP socket 621 * @xprt: transport 622 * 623 * Initiates a graceful shutdown of the TCP socket by calling the 624 * equivalent of shutdown(SHUT_WR); 625 */ 626 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 627 { 628 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 629 struct socket *sock = transport->sock; 630 631 if (sock != NULL) 632 kernel_sock_shutdown(sock, SHUT_WR); 633 } 634 635 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 636 { 637 u32 reclen = buf->len - sizeof(rpc_fraghdr); 638 rpc_fraghdr *base = buf->head[0].iov_base; 639 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 640 } 641 642 /** 643 * xs_tcp_send_request - write an RPC request to a TCP socket 644 * @task: address of RPC task that manages the state of an RPC request 645 * 646 * Return values: 647 * 0: The request has been sent 648 * EAGAIN: The socket was blocked, please call again later to 649 * complete the request 650 * ENOTCONN: Caller needs to invoke connect logic then call again 651 * other: Some other error occured, the request was not sent 652 * 653 * XXX: In the case of soft timeouts, should we eventually give up 654 * if sendmsg is not able to make progress? 655 */ 656 static int xs_tcp_send_request(struct rpc_task *task) 657 { 658 struct rpc_rqst *req = task->tk_rqstp; 659 struct rpc_xprt *xprt = req->rq_xprt; 660 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 661 struct xdr_buf *xdr = &req->rq_snd_buf; 662 int status; 663 664 xs_encode_tcp_record_marker(&req->rq_snd_buf); 665 666 xs_pktdump("packet data:", 667 req->rq_svec->iov_base, 668 req->rq_svec->iov_len); 669 670 /* Continue transmitting the packet/record. We must be careful 671 * to cope with writespace callbacks arriving _after_ we have 672 * called sendmsg(). */ 673 while (1) { 674 status = xs_sendpages(transport->sock, 675 NULL, 0, xdr, req->rq_bytes_sent); 676 677 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 678 xdr->len - req->rq_bytes_sent, status); 679 680 if (unlikely(status < 0)) 681 break; 682 683 /* If we've sent the entire packet, immediately 684 * reset the count of bytes sent. */ 685 req->rq_bytes_sent += status; 686 task->tk_bytes_sent += status; 687 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 688 req->rq_bytes_sent = 0; 689 return 0; 690 } 691 692 if (status != 0) 693 continue; 694 status = -EAGAIN; 695 break; 696 } 697 698 switch (status) { 699 case -EAGAIN: 700 xs_nospace(task); 701 break; 702 case -ECONNRESET: 703 xs_tcp_shutdown(xprt); 704 case -ECONNREFUSED: 705 case -ENOTCONN: 706 case -EPIPE: 707 status = -ENOTCONN; 708 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 709 break; 710 default: 711 dprintk("RPC: sendmsg returned unrecognized error %d\n", 712 -status); 713 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 714 xs_tcp_shutdown(xprt); 715 } 716 717 return status; 718 } 719 720 /** 721 * xs_tcp_release_xprt - clean up after a tcp transmission 722 * @xprt: transport 723 * @task: rpc task 724 * 725 * This cleans up if an error causes us to abort the transmission of a request. 726 * In this case, the socket may need to be reset in order to avoid confusing 727 * the server. 728 */ 729 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 730 { 731 struct rpc_rqst *req; 732 733 if (task != xprt->snd_task) 734 return; 735 if (task == NULL) 736 goto out_release; 737 req = task->tk_rqstp; 738 if (req->rq_bytes_sent == 0) 739 goto out_release; 740 if (req->rq_bytes_sent == req->rq_snd_buf.len) 741 goto out_release; 742 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 743 out_release: 744 xprt_release_xprt(xprt, task); 745 } 746 747 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 748 { 749 transport->old_data_ready = sk->sk_data_ready; 750 transport->old_state_change = sk->sk_state_change; 751 transport->old_write_space = sk->sk_write_space; 752 transport->old_error_report = sk->sk_error_report; 753 } 754 755 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 756 { 757 sk->sk_data_ready = transport->old_data_ready; 758 sk->sk_state_change = transport->old_state_change; 759 sk->sk_write_space = transport->old_write_space; 760 sk->sk_error_report = transport->old_error_report; 761 } 762 763 /** 764 * xs_close - close a socket 765 * @xprt: transport 766 * 767 * This is used when all requests are complete; ie, no DRC state remains 768 * on the server we want to save. 769 */ 770 static void xs_close(struct rpc_xprt *xprt) 771 { 772 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 773 struct socket *sock = transport->sock; 774 struct sock *sk = transport->inet; 775 776 if (!sk) 777 goto clear_close_wait; 778 779 dprintk("RPC: xs_close xprt %p\n", xprt); 780 781 write_lock_bh(&sk->sk_callback_lock); 782 transport->inet = NULL; 783 transport->sock = NULL; 784 785 sk->sk_user_data = NULL; 786 787 xs_restore_old_callbacks(transport, sk); 788 write_unlock_bh(&sk->sk_callback_lock); 789 790 sk->sk_no_check = 0; 791 792 sock_release(sock); 793 clear_close_wait: 794 smp_mb__before_clear_bit(); 795 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 796 clear_bit(XPRT_CLOSING, &xprt->state); 797 smp_mb__after_clear_bit(); 798 xprt_disconnect_done(xprt); 799 } 800 801 /** 802 * xs_destroy - prepare to shutdown a transport 803 * @xprt: doomed transport 804 * 805 */ 806 static void xs_destroy(struct rpc_xprt *xprt) 807 { 808 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 809 810 dprintk("RPC: xs_destroy xprt %p\n", xprt); 811 812 cancel_rearming_delayed_work(&transport->connect_worker); 813 814 xs_close(xprt); 815 xs_free_peer_addresses(xprt); 816 kfree(xprt->slot); 817 kfree(xprt); 818 module_put(THIS_MODULE); 819 } 820 821 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 822 { 823 return (struct rpc_xprt *) sk->sk_user_data; 824 } 825 826 /** 827 * xs_udp_data_ready - "data ready" callback for UDP sockets 828 * @sk: socket with data to read 829 * @len: how much data to read 830 * 831 */ 832 static void xs_udp_data_ready(struct sock *sk, int len) 833 { 834 struct rpc_task *task; 835 struct rpc_xprt *xprt; 836 struct rpc_rqst *rovr; 837 struct sk_buff *skb; 838 int err, repsize, copied; 839 u32 _xid; 840 __be32 *xp; 841 842 read_lock(&sk->sk_callback_lock); 843 dprintk("RPC: xs_udp_data_ready...\n"); 844 if (!(xprt = xprt_from_sock(sk))) 845 goto out; 846 847 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 848 goto out; 849 850 if (xprt->shutdown) 851 goto dropit; 852 853 repsize = skb->len - sizeof(struct udphdr); 854 if (repsize < 4) { 855 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 856 goto dropit; 857 } 858 859 /* Copy the XID from the skb... */ 860 xp = skb_header_pointer(skb, sizeof(struct udphdr), 861 sizeof(_xid), &_xid); 862 if (xp == NULL) 863 goto dropit; 864 865 /* Look up and lock the request corresponding to the given XID */ 866 spin_lock(&xprt->transport_lock); 867 rovr = xprt_lookup_rqst(xprt, *xp); 868 if (!rovr) 869 goto out_unlock; 870 task = rovr->rq_task; 871 872 if ((copied = rovr->rq_private_buf.buflen) > repsize) 873 copied = repsize; 874 875 /* Suck it into the iovec, verify checksum if not done by hw. */ 876 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 877 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 878 goto out_unlock; 879 } 880 881 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 882 883 /* Something worked... */ 884 dst_confirm(skb->dst); 885 886 xprt_adjust_cwnd(task, copied); 887 xprt_update_rtt(task); 888 xprt_complete_rqst(task, copied); 889 890 out_unlock: 891 spin_unlock(&xprt->transport_lock); 892 dropit: 893 skb_free_datagram(sk, skb); 894 out: 895 read_unlock(&sk->sk_callback_lock); 896 } 897 898 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 899 { 900 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 901 size_t len, used; 902 char *p; 903 904 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 905 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 906 used = xdr_skb_read_bits(desc, p, len); 907 transport->tcp_offset += used; 908 if (used != len) 909 return; 910 911 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 912 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 913 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 914 else 915 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 916 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 917 918 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 919 transport->tcp_offset = 0; 920 921 /* Sanity check of the record length */ 922 if (unlikely(transport->tcp_reclen < 4)) { 923 dprintk("RPC: invalid TCP record fragment length\n"); 924 xprt_force_disconnect(xprt); 925 return; 926 } 927 dprintk("RPC: reading TCP record fragment of length %d\n", 928 transport->tcp_reclen); 929 } 930 931 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 932 { 933 if (transport->tcp_offset == transport->tcp_reclen) { 934 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 935 transport->tcp_offset = 0; 936 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 937 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 938 transport->tcp_flags |= TCP_RCV_COPY_XID; 939 transport->tcp_copied = 0; 940 } 941 } 942 } 943 944 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 945 { 946 size_t len, used; 947 char *p; 948 949 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 950 dprintk("RPC: reading XID (%Zu bytes)\n", len); 951 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 952 used = xdr_skb_read_bits(desc, p, len); 953 transport->tcp_offset += used; 954 if (used != len) 955 return; 956 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 957 transport->tcp_flags |= TCP_RCV_COPY_DATA; 958 transport->tcp_copied = 4; 959 dprintk("RPC: reading reply for XID %08x\n", 960 ntohl(transport->tcp_xid)); 961 xs_tcp_check_fraghdr(transport); 962 } 963 964 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 965 { 966 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 967 struct rpc_rqst *req; 968 struct xdr_buf *rcvbuf; 969 size_t len; 970 ssize_t r; 971 972 /* Find and lock the request corresponding to this xid */ 973 spin_lock(&xprt->transport_lock); 974 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 975 if (!req) { 976 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 977 dprintk("RPC: XID %08x request not found!\n", 978 ntohl(transport->tcp_xid)); 979 spin_unlock(&xprt->transport_lock); 980 return; 981 } 982 983 rcvbuf = &req->rq_private_buf; 984 len = desc->count; 985 if (len > transport->tcp_reclen - transport->tcp_offset) { 986 struct xdr_skb_reader my_desc; 987 988 len = transport->tcp_reclen - transport->tcp_offset; 989 memcpy(&my_desc, desc, sizeof(my_desc)); 990 my_desc.count = len; 991 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 992 &my_desc, xdr_skb_read_bits); 993 desc->count -= r; 994 desc->offset += r; 995 } else 996 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 997 desc, xdr_skb_read_bits); 998 999 if (r > 0) { 1000 transport->tcp_copied += r; 1001 transport->tcp_offset += r; 1002 } 1003 if (r != len) { 1004 /* Error when copying to the receive buffer, 1005 * usually because we weren't able to allocate 1006 * additional buffer pages. All we can do now 1007 * is turn off TCP_RCV_COPY_DATA, so the request 1008 * will not receive any additional updates, 1009 * and time out. 1010 * Any remaining data from this record will 1011 * be discarded. 1012 */ 1013 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1014 dprintk("RPC: XID %08x truncated request\n", 1015 ntohl(transport->tcp_xid)); 1016 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1017 "tcp_offset = %u, tcp_reclen = %u\n", 1018 xprt, transport->tcp_copied, 1019 transport->tcp_offset, transport->tcp_reclen); 1020 goto out; 1021 } 1022 1023 dprintk("RPC: XID %08x read %Zd bytes\n", 1024 ntohl(transport->tcp_xid), r); 1025 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1026 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1027 transport->tcp_offset, transport->tcp_reclen); 1028 1029 if (transport->tcp_copied == req->rq_private_buf.buflen) 1030 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1031 else if (transport->tcp_offset == transport->tcp_reclen) { 1032 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1033 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1034 } 1035 1036 out: 1037 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1038 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1039 spin_unlock(&xprt->transport_lock); 1040 xs_tcp_check_fraghdr(transport); 1041 } 1042 1043 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1044 { 1045 size_t len; 1046 1047 len = transport->tcp_reclen - transport->tcp_offset; 1048 if (len > desc->count) 1049 len = desc->count; 1050 desc->count -= len; 1051 desc->offset += len; 1052 transport->tcp_offset += len; 1053 dprintk("RPC: discarded %Zu bytes\n", len); 1054 xs_tcp_check_fraghdr(transport); 1055 } 1056 1057 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1058 { 1059 struct rpc_xprt *xprt = rd_desc->arg.data; 1060 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1061 struct xdr_skb_reader desc = { 1062 .skb = skb, 1063 .offset = offset, 1064 .count = len, 1065 }; 1066 1067 dprintk("RPC: xs_tcp_data_recv started\n"); 1068 do { 1069 /* Read in a new fragment marker if necessary */ 1070 /* Can we ever really expect to get completely empty fragments? */ 1071 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1072 xs_tcp_read_fraghdr(xprt, &desc); 1073 continue; 1074 } 1075 /* Read in the xid if necessary */ 1076 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1077 xs_tcp_read_xid(transport, &desc); 1078 continue; 1079 } 1080 /* Read in the request data */ 1081 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1082 xs_tcp_read_request(xprt, &desc); 1083 continue; 1084 } 1085 /* Skip over any trailing bytes on short reads */ 1086 xs_tcp_read_discard(transport, &desc); 1087 } while (desc.count); 1088 dprintk("RPC: xs_tcp_data_recv done\n"); 1089 return len - desc.count; 1090 } 1091 1092 /** 1093 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1094 * @sk: socket with data to read 1095 * @bytes: how much data to read 1096 * 1097 */ 1098 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1099 { 1100 struct rpc_xprt *xprt; 1101 read_descriptor_t rd_desc; 1102 int read; 1103 1104 dprintk("RPC: xs_tcp_data_ready...\n"); 1105 1106 read_lock(&sk->sk_callback_lock); 1107 if (!(xprt = xprt_from_sock(sk))) 1108 goto out; 1109 if (xprt->shutdown) 1110 goto out; 1111 1112 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1113 rd_desc.arg.data = xprt; 1114 do { 1115 rd_desc.count = 65536; 1116 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1117 } while (read > 0); 1118 out: 1119 read_unlock(&sk->sk_callback_lock); 1120 } 1121 1122 /** 1123 * xs_tcp_state_change - callback to handle TCP socket state changes 1124 * @sk: socket whose state has changed 1125 * 1126 */ 1127 static void xs_tcp_state_change(struct sock *sk) 1128 { 1129 struct rpc_xprt *xprt; 1130 1131 read_lock(&sk->sk_callback_lock); 1132 if (!(xprt = xprt_from_sock(sk))) 1133 goto out; 1134 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1135 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1136 sk->sk_state, xprt_connected(xprt), 1137 sock_flag(sk, SOCK_DEAD), 1138 sock_flag(sk, SOCK_ZAPPED)); 1139 1140 switch (sk->sk_state) { 1141 case TCP_ESTABLISHED: 1142 spin_lock_bh(&xprt->transport_lock); 1143 if (!xprt_test_and_set_connected(xprt)) { 1144 struct sock_xprt *transport = container_of(xprt, 1145 struct sock_xprt, xprt); 1146 1147 /* Reset TCP record info */ 1148 transport->tcp_offset = 0; 1149 transport->tcp_reclen = 0; 1150 transport->tcp_copied = 0; 1151 transport->tcp_flags = 1152 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1153 1154 xprt_wake_pending_tasks(xprt, 0); 1155 } 1156 spin_unlock_bh(&xprt->transport_lock); 1157 break; 1158 case TCP_FIN_WAIT1: 1159 /* The client initiated a shutdown of the socket */ 1160 xprt->connect_cookie++; 1161 xprt->reestablish_timeout = 0; 1162 set_bit(XPRT_CLOSING, &xprt->state); 1163 smp_mb__before_clear_bit(); 1164 clear_bit(XPRT_CONNECTED, &xprt->state); 1165 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1166 smp_mb__after_clear_bit(); 1167 break; 1168 case TCP_CLOSE_WAIT: 1169 /* The server initiated a shutdown of the socket */ 1170 set_bit(XPRT_CLOSING, &xprt->state); 1171 xprt_force_disconnect(xprt); 1172 case TCP_SYN_SENT: 1173 xprt->connect_cookie++; 1174 case TCP_CLOSING: 1175 /* 1176 * If the server closed down the connection, make sure that 1177 * we back off before reconnecting 1178 */ 1179 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1180 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1181 break; 1182 case TCP_LAST_ACK: 1183 smp_mb__before_clear_bit(); 1184 clear_bit(XPRT_CONNECTED, &xprt->state); 1185 smp_mb__after_clear_bit(); 1186 break; 1187 case TCP_CLOSE: 1188 smp_mb__before_clear_bit(); 1189 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1190 clear_bit(XPRT_CLOSING, &xprt->state); 1191 smp_mb__after_clear_bit(); 1192 /* Mark transport as closed and wake up all pending tasks */ 1193 xprt_disconnect_done(xprt); 1194 } 1195 out: 1196 read_unlock(&sk->sk_callback_lock); 1197 } 1198 1199 /** 1200 * xs_tcp_error_report - callback mainly for catching RST events 1201 * @sk: socket 1202 */ 1203 static void xs_tcp_error_report(struct sock *sk) 1204 { 1205 struct rpc_xprt *xprt; 1206 1207 read_lock(&sk->sk_callback_lock); 1208 if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED) 1209 goto out; 1210 if (!(xprt = xprt_from_sock(sk))) 1211 goto out; 1212 dprintk("RPC: %s client %p...\n" 1213 "RPC: error %d\n", 1214 __func__, xprt, sk->sk_err); 1215 1216 xprt_force_disconnect(xprt); 1217 out: 1218 read_unlock(&sk->sk_callback_lock); 1219 } 1220 1221 /** 1222 * xs_udp_write_space - callback invoked when socket buffer space 1223 * becomes available 1224 * @sk: socket whose state has changed 1225 * 1226 * Called when more output buffer space is available for this socket. 1227 * We try not to wake our writers until they can make "significant" 1228 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1229 * with a bunch of small requests. 1230 */ 1231 static void xs_udp_write_space(struct sock *sk) 1232 { 1233 read_lock(&sk->sk_callback_lock); 1234 1235 /* from net/core/sock.c:sock_def_write_space */ 1236 if (sock_writeable(sk)) { 1237 struct socket *sock; 1238 struct rpc_xprt *xprt; 1239 1240 if (unlikely(!(sock = sk->sk_socket))) 1241 goto out; 1242 clear_bit(SOCK_NOSPACE, &sock->flags); 1243 1244 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1245 goto out; 1246 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1247 goto out; 1248 1249 xprt_write_space(xprt); 1250 } 1251 1252 out: 1253 read_unlock(&sk->sk_callback_lock); 1254 } 1255 1256 /** 1257 * xs_tcp_write_space - callback invoked when socket buffer space 1258 * becomes available 1259 * @sk: socket whose state has changed 1260 * 1261 * Called when more output buffer space is available for this socket. 1262 * We try not to wake our writers until they can make "significant" 1263 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1264 * with a bunch of small requests. 1265 */ 1266 static void xs_tcp_write_space(struct sock *sk) 1267 { 1268 read_lock(&sk->sk_callback_lock); 1269 1270 /* from net/core/stream.c:sk_stream_write_space */ 1271 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 1272 struct socket *sock; 1273 struct rpc_xprt *xprt; 1274 1275 if (unlikely(!(sock = sk->sk_socket))) 1276 goto out; 1277 clear_bit(SOCK_NOSPACE, &sock->flags); 1278 1279 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1280 goto out; 1281 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1282 goto out; 1283 1284 xprt_write_space(xprt); 1285 } 1286 1287 out: 1288 read_unlock(&sk->sk_callback_lock); 1289 } 1290 1291 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1292 { 1293 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1294 struct sock *sk = transport->inet; 1295 1296 if (transport->rcvsize) { 1297 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1298 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1299 } 1300 if (transport->sndsize) { 1301 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1302 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1303 sk->sk_write_space(sk); 1304 } 1305 } 1306 1307 /** 1308 * xs_udp_set_buffer_size - set send and receive limits 1309 * @xprt: generic transport 1310 * @sndsize: requested size of send buffer, in bytes 1311 * @rcvsize: requested size of receive buffer, in bytes 1312 * 1313 * Set socket send and receive buffer size limits. 1314 */ 1315 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1316 { 1317 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1318 1319 transport->sndsize = 0; 1320 if (sndsize) 1321 transport->sndsize = sndsize + 1024; 1322 transport->rcvsize = 0; 1323 if (rcvsize) 1324 transport->rcvsize = rcvsize + 1024; 1325 1326 xs_udp_do_set_buffer_size(xprt); 1327 } 1328 1329 /** 1330 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1331 * @task: task that timed out 1332 * 1333 * Adjust the congestion window after a retransmit timeout has occurred. 1334 */ 1335 static void xs_udp_timer(struct rpc_task *task) 1336 { 1337 xprt_adjust_cwnd(task, -ETIMEDOUT); 1338 } 1339 1340 static unsigned short xs_get_random_port(void) 1341 { 1342 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1343 unsigned short rand = (unsigned short) net_random() % range; 1344 return rand + xprt_min_resvport; 1345 } 1346 1347 /** 1348 * xs_set_port - reset the port number in the remote endpoint address 1349 * @xprt: generic transport 1350 * @port: new port number 1351 * 1352 */ 1353 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1354 { 1355 struct sockaddr *addr = xs_addr(xprt); 1356 1357 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1358 1359 switch (addr->sa_family) { 1360 case AF_INET: 1361 ((struct sockaddr_in *)addr)->sin_port = htons(port); 1362 break; 1363 case AF_INET6: 1364 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); 1365 break; 1366 default: 1367 BUG(); 1368 } 1369 } 1370 1371 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1372 { 1373 unsigned short port = transport->port; 1374 1375 if (port == 0 && transport->xprt.resvport) 1376 port = xs_get_random_port(); 1377 return port; 1378 } 1379 1380 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1381 { 1382 if (transport->port != 0) 1383 transport->port = 0; 1384 if (!transport->xprt.resvport) 1385 return 0; 1386 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1387 return xprt_max_resvport; 1388 return --port; 1389 } 1390 1391 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1392 { 1393 struct sockaddr_in myaddr = { 1394 .sin_family = AF_INET, 1395 }; 1396 struct sockaddr_in *sa; 1397 int err, nloop = 0; 1398 unsigned short port = xs_get_srcport(transport, sock); 1399 unsigned short last; 1400 1401 sa = (struct sockaddr_in *)&transport->addr; 1402 myaddr.sin_addr = sa->sin_addr; 1403 do { 1404 myaddr.sin_port = htons(port); 1405 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1406 sizeof(myaddr)); 1407 if (port == 0) 1408 break; 1409 if (err == 0) { 1410 transport->port = port; 1411 break; 1412 } 1413 last = port; 1414 port = xs_next_srcport(transport, sock, port); 1415 if (port > last) 1416 nloop++; 1417 } while (err == -EADDRINUSE && nloop != 2); 1418 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n", 1419 __func__, NIPQUAD(myaddr.sin_addr), 1420 port, err ? "failed" : "ok", err); 1421 return err; 1422 } 1423 1424 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1425 { 1426 struct sockaddr_in6 myaddr = { 1427 .sin6_family = AF_INET6, 1428 }; 1429 struct sockaddr_in6 *sa; 1430 int err, nloop = 0; 1431 unsigned short port = xs_get_srcport(transport, sock); 1432 unsigned short last; 1433 1434 sa = (struct sockaddr_in6 *)&transport->addr; 1435 myaddr.sin6_addr = sa->sin6_addr; 1436 do { 1437 myaddr.sin6_port = htons(port); 1438 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1439 sizeof(myaddr)); 1440 if (port == 0) 1441 break; 1442 if (err == 0) { 1443 transport->port = port; 1444 break; 1445 } 1446 last = port; 1447 port = xs_next_srcport(transport, sock, port); 1448 if (port > last) 1449 nloop++; 1450 } while (err == -EADDRINUSE && nloop != 2); 1451 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n", 1452 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err); 1453 return err; 1454 } 1455 1456 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1457 static struct lock_class_key xs_key[2]; 1458 static struct lock_class_key xs_slock_key[2]; 1459 1460 static inline void xs_reclassify_socket4(struct socket *sock) 1461 { 1462 struct sock *sk = sock->sk; 1463 1464 BUG_ON(sock_owned_by_user(sk)); 1465 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1466 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1467 } 1468 1469 static inline void xs_reclassify_socket6(struct socket *sock) 1470 { 1471 struct sock *sk = sock->sk; 1472 1473 BUG_ON(sock_owned_by_user(sk)); 1474 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1475 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1476 } 1477 #else 1478 static inline void xs_reclassify_socket4(struct socket *sock) 1479 { 1480 } 1481 1482 static inline void xs_reclassify_socket6(struct socket *sock) 1483 { 1484 } 1485 #endif 1486 1487 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1488 { 1489 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1490 1491 if (!transport->inet) { 1492 struct sock *sk = sock->sk; 1493 1494 write_lock_bh(&sk->sk_callback_lock); 1495 1496 xs_save_old_callbacks(transport, sk); 1497 1498 sk->sk_user_data = xprt; 1499 sk->sk_data_ready = xs_udp_data_ready; 1500 sk->sk_write_space = xs_udp_write_space; 1501 sk->sk_no_check = UDP_CSUM_NORCV; 1502 sk->sk_allocation = GFP_ATOMIC; 1503 1504 xprt_set_connected(xprt); 1505 1506 /* Reset to new socket */ 1507 transport->sock = sock; 1508 transport->inet = sk; 1509 1510 write_unlock_bh(&sk->sk_callback_lock); 1511 } 1512 xs_udp_do_set_buffer_size(xprt); 1513 } 1514 1515 /** 1516 * xs_udp_connect_worker4 - set up a UDP socket 1517 * @work: RPC transport to connect 1518 * 1519 * Invoked by a work queue tasklet. 1520 */ 1521 static void xs_udp_connect_worker4(struct work_struct *work) 1522 { 1523 struct sock_xprt *transport = 1524 container_of(work, struct sock_xprt, connect_worker.work); 1525 struct rpc_xprt *xprt = &transport->xprt; 1526 struct socket *sock = transport->sock; 1527 int err, status = -EIO; 1528 1529 if (xprt->shutdown || !xprt_bound(xprt)) 1530 goto out; 1531 1532 /* Start by resetting any existing state */ 1533 xs_close(xprt); 1534 1535 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1536 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1537 goto out; 1538 } 1539 xs_reclassify_socket4(sock); 1540 1541 if (xs_bind4(transport, sock)) { 1542 sock_release(sock); 1543 goto out; 1544 } 1545 1546 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1547 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1548 1549 xs_udp_finish_connecting(xprt, sock); 1550 status = 0; 1551 out: 1552 xprt_wake_pending_tasks(xprt, status); 1553 xprt_clear_connecting(xprt); 1554 } 1555 1556 /** 1557 * xs_udp_connect_worker6 - set up a UDP socket 1558 * @work: RPC transport to connect 1559 * 1560 * Invoked by a work queue tasklet. 1561 */ 1562 static void xs_udp_connect_worker6(struct work_struct *work) 1563 { 1564 struct sock_xprt *transport = 1565 container_of(work, struct sock_xprt, connect_worker.work); 1566 struct rpc_xprt *xprt = &transport->xprt; 1567 struct socket *sock = transport->sock; 1568 int err, status = -EIO; 1569 1570 if (xprt->shutdown || !xprt_bound(xprt)) 1571 goto out; 1572 1573 /* Start by resetting any existing state */ 1574 xs_close(xprt); 1575 1576 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1577 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1578 goto out; 1579 } 1580 xs_reclassify_socket6(sock); 1581 1582 if (xs_bind6(transport, sock) < 0) { 1583 sock_release(sock); 1584 goto out; 1585 } 1586 1587 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1588 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1589 1590 xs_udp_finish_connecting(xprt, sock); 1591 status = 0; 1592 out: 1593 xprt_wake_pending_tasks(xprt, status); 1594 xprt_clear_connecting(xprt); 1595 } 1596 1597 /* 1598 * We need to preserve the port number so the reply cache on the server can 1599 * find our cached RPC replies when we get around to reconnecting. 1600 */ 1601 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 1602 { 1603 int result; 1604 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1605 struct sockaddr any; 1606 1607 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1608 1609 /* 1610 * Disconnect the transport socket by doing a connect operation 1611 * with AF_UNSPEC. This should return immediately... 1612 */ 1613 memset(&any, 0, sizeof(any)); 1614 any.sa_family = AF_UNSPEC; 1615 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1616 if (result) 1617 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1618 result); 1619 } 1620 1621 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1622 { 1623 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1624 1625 if (!transport->inet) { 1626 struct sock *sk = sock->sk; 1627 1628 write_lock_bh(&sk->sk_callback_lock); 1629 1630 xs_save_old_callbacks(transport, sk); 1631 1632 sk->sk_user_data = xprt; 1633 sk->sk_data_ready = xs_tcp_data_ready; 1634 sk->sk_state_change = xs_tcp_state_change; 1635 sk->sk_write_space = xs_tcp_write_space; 1636 sk->sk_error_report = xs_tcp_error_report; 1637 sk->sk_allocation = GFP_ATOMIC; 1638 1639 /* socket options */ 1640 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1641 sock_reset_flag(sk, SOCK_LINGER); 1642 tcp_sk(sk)->linger2 = 0; 1643 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1644 1645 xprt_clear_connected(xprt); 1646 1647 /* Reset to new socket */ 1648 transport->sock = sock; 1649 transport->inet = sk; 1650 1651 write_unlock_bh(&sk->sk_callback_lock); 1652 } 1653 1654 /* Tell the socket layer to start connecting... */ 1655 xprt->stat.connect_count++; 1656 xprt->stat.connect_start = jiffies; 1657 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1658 } 1659 1660 /** 1661 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1662 * @work: RPC transport to connect 1663 * 1664 * Invoked by a work queue tasklet. 1665 */ 1666 static void xs_tcp_connect_worker4(struct work_struct *work) 1667 { 1668 struct sock_xprt *transport = 1669 container_of(work, struct sock_xprt, connect_worker.work); 1670 struct rpc_xprt *xprt = &transport->xprt; 1671 struct socket *sock = transport->sock; 1672 int err, status = -EIO; 1673 1674 if (xprt->shutdown || !xprt_bound(xprt)) 1675 goto out; 1676 1677 if (!sock) { 1678 /* start from scratch */ 1679 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1680 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1681 goto out; 1682 } 1683 xs_reclassify_socket4(sock); 1684 1685 if (xs_bind4(transport, sock) < 0) { 1686 sock_release(sock); 1687 goto out; 1688 } 1689 } else 1690 /* "close" the socket, preserving the local port */ 1691 xs_tcp_reuse_connection(xprt); 1692 1693 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1694 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1695 1696 status = xs_tcp_finish_connecting(xprt, sock); 1697 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1698 xprt, -status, xprt_connected(xprt), 1699 sock->sk->sk_state); 1700 if (status < 0) { 1701 switch (status) { 1702 case -EINPROGRESS: 1703 case -EALREADY: 1704 goto out_clear; 1705 case -ECONNREFUSED: 1706 case -ECONNRESET: 1707 /* retry with existing socket, after a delay */ 1708 break; 1709 default: 1710 /* get rid of existing socket, and retry */ 1711 xs_tcp_shutdown(xprt); 1712 } 1713 } 1714 out: 1715 xprt_wake_pending_tasks(xprt, status); 1716 out_clear: 1717 xprt_clear_connecting(xprt); 1718 } 1719 1720 /** 1721 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1722 * @work: RPC transport to connect 1723 * 1724 * Invoked by a work queue tasklet. 1725 */ 1726 static void xs_tcp_connect_worker6(struct work_struct *work) 1727 { 1728 struct sock_xprt *transport = 1729 container_of(work, struct sock_xprt, connect_worker.work); 1730 struct rpc_xprt *xprt = &transport->xprt; 1731 struct socket *sock = transport->sock; 1732 int err, status = -EIO; 1733 1734 if (xprt->shutdown || !xprt_bound(xprt)) 1735 goto out; 1736 1737 if (!sock) { 1738 /* start from scratch */ 1739 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1740 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1741 goto out; 1742 } 1743 xs_reclassify_socket6(sock); 1744 1745 if (xs_bind6(transport, sock) < 0) { 1746 sock_release(sock); 1747 goto out; 1748 } 1749 } else 1750 /* "close" the socket, preserving the local port */ 1751 xs_tcp_reuse_connection(xprt); 1752 1753 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1754 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1755 1756 status = xs_tcp_finish_connecting(xprt, sock); 1757 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1758 xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1759 if (status < 0) { 1760 switch (status) { 1761 case -EINPROGRESS: 1762 case -EALREADY: 1763 goto out_clear; 1764 case -ECONNREFUSED: 1765 case -ECONNRESET: 1766 /* retry with existing socket, after a delay */ 1767 break; 1768 default: 1769 /* get rid of existing socket, and retry */ 1770 xs_tcp_shutdown(xprt); 1771 } 1772 } 1773 out: 1774 xprt_wake_pending_tasks(xprt, status); 1775 out_clear: 1776 xprt_clear_connecting(xprt); 1777 } 1778 1779 /** 1780 * xs_connect - connect a socket to a remote endpoint 1781 * @task: address of RPC task that manages state of connect request 1782 * 1783 * TCP: If the remote end dropped the connection, delay reconnecting. 1784 * 1785 * UDP socket connects are synchronous, but we use a work queue anyway 1786 * to guarantee that even unprivileged user processes can set up a 1787 * socket on a privileged port. 1788 * 1789 * If a UDP socket connect fails, the delay behavior here prevents 1790 * retry floods (hard mounts). 1791 */ 1792 static void xs_connect(struct rpc_task *task) 1793 { 1794 struct rpc_xprt *xprt = task->tk_xprt; 1795 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1796 1797 if (xprt_test_and_set_connecting(xprt)) 1798 return; 1799 1800 if (transport->sock != NULL) { 1801 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1802 "seconds\n", 1803 xprt, xprt->reestablish_timeout / HZ); 1804 queue_delayed_work(rpciod_workqueue, 1805 &transport->connect_worker, 1806 xprt->reestablish_timeout); 1807 xprt->reestablish_timeout <<= 1; 1808 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1809 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1810 } else { 1811 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1812 queue_delayed_work(rpciod_workqueue, 1813 &transport->connect_worker, 0); 1814 } 1815 } 1816 1817 static void xs_tcp_connect(struct rpc_task *task) 1818 { 1819 struct rpc_xprt *xprt = task->tk_xprt; 1820 1821 /* Initiate graceful shutdown of the socket if not already done */ 1822 if (test_bit(XPRT_CONNECTED, &xprt->state)) 1823 xs_tcp_shutdown(xprt); 1824 /* Exit if we need to wait for socket shutdown to complete */ 1825 if (test_bit(XPRT_CLOSING, &xprt->state)) 1826 return; 1827 xs_connect(task); 1828 } 1829 1830 /** 1831 * xs_udp_print_stats - display UDP socket-specifc stats 1832 * @xprt: rpc_xprt struct containing statistics 1833 * @seq: output file 1834 * 1835 */ 1836 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1837 { 1838 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1839 1840 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1841 transport->port, 1842 xprt->stat.bind_count, 1843 xprt->stat.sends, 1844 xprt->stat.recvs, 1845 xprt->stat.bad_xids, 1846 xprt->stat.req_u, 1847 xprt->stat.bklog_u); 1848 } 1849 1850 /** 1851 * xs_tcp_print_stats - display TCP socket-specifc stats 1852 * @xprt: rpc_xprt struct containing statistics 1853 * @seq: output file 1854 * 1855 */ 1856 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1857 { 1858 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1859 long idle_time = 0; 1860 1861 if (xprt_connected(xprt)) 1862 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1863 1864 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1865 transport->port, 1866 xprt->stat.bind_count, 1867 xprt->stat.connect_count, 1868 xprt->stat.connect_time, 1869 idle_time, 1870 xprt->stat.sends, 1871 xprt->stat.recvs, 1872 xprt->stat.bad_xids, 1873 xprt->stat.req_u, 1874 xprt->stat.bklog_u); 1875 } 1876 1877 static struct rpc_xprt_ops xs_udp_ops = { 1878 .set_buffer_size = xs_udp_set_buffer_size, 1879 .reserve_xprt = xprt_reserve_xprt_cong, 1880 .release_xprt = xprt_release_xprt_cong, 1881 .rpcbind = rpcb_getport_async, 1882 .set_port = xs_set_port, 1883 .connect = xs_connect, 1884 .buf_alloc = rpc_malloc, 1885 .buf_free = rpc_free, 1886 .send_request = xs_udp_send_request, 1887 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1888 .timer = xs_udp_timer, 1889 .release_request = xprt_release_rqst_cong, 1890 .close = xs_close, 1891 .destroy = xs_destroy, 1892 .print_stats = xs_udp_print_stats, 1893 }; 1894 1895 static struct rpc_xprt_ops xs_tcp_ops = { 1896 .reserve_xprt = xprt_reserve_xprt, 1897 .release_xprt = xs_tcp_release_xprt, 1898 .rpcbind = rpcb_getport_async, 1899 .set_port = xs_set_port, 1900 .connect = xs_tcp_connect, 1901 .buf_alloc = rpc_malloc, 1902 .buf_free = rpc_free, 1903 .send_request = xs_tcp_send_request, 1904 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1905 .close = xs_tcp_shutdown, 1906 .destroy = xs_destroy, 1907 .print_stats = xs_tcp_print_stats, 1908 }; 1909 1910 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 1911 unsigned int slot_table_size) 1912 { 1913 struct rpc_xprt *xprt; 1914 struct sock_xprt *new; 1915 1916 if (args->addrlen > sizeof(xprt->addr)) { 1917 dprintk("RPC: xs_setup_xprt: address too large\n"); 1918 return ERR_PTR(-EBADF); 1919 } 1920 1921 new = kzalloc(sizeof(*new), GFP_KERNEL); 1922 if (new == NULL) { 1923 dprintk("RPC: xs_setup_xprt: couldn't allocate " 1924 "rpc_xprt\n"); 1925 return ERR_PTR(-ENOMEM); 1926 } 1927 xprt = &new->xprt; 1928 1929 xprt->max_reqs = slot_table_size; 1930 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 1931 if (xprt->slot == NULL) { 1932 kfree(xprt); 1933 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 1934 "table\n"); 1935 return ERR_PTR(-ENOMEM); 1936 } 1937 1938 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 1939 xprt->addrlen = args->addrlen; 1940 if (args->srcaddr) 1941 memcpy(&new->addr, args->srcaddr, args->addrlen); 1942 1943 return xprt; 1944 } 1945 1946 static const struct rpc_timeout xs_udp_default_timeout = { 1947 .to_initval = 5 * HZ, 1948 .to_maxval = 30 * HZ, 1949 .to_increment = 5 * HZ, 1950 .to_retries = 5, 1951 }; 1952 1953 /** 1954 * xs_setup_udp - Set up transport to use a UDP socket 1955 * @args: rpc transport creation arguments 1956 * 1957 */ 1958 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 1959 { 1960 struct sockaddr *addr = args->dstaddr; 1961 struct rpc_xprt *xprt; 1962 struct sock_xprt *transport; 1963 1964 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 1965 if (IS_ERR(xprt)) 1966 return xprt; 1967 transport = container_of(xprt, struct sock_xprt, xprt); 1968 1969 xprt->prot = IPPROTO_UDP; 1970 xprt->tsh_size = 0; 1971 /* XXX: header size can vary due to auth type, IPv6, etc. */ 1972 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1973 1974 xprt->bind_timeout = XS_BIND_TO; 1975 xprt->connect_timeout = XS_UDP_CONN_TO; 1976 xprt->reestablish_timeout = XS_UDP_REEST_TO; 1977 xprt->idle_timeout = XS_IDLE_DISC_TO; 1978 1979 xprt->ops = &xs_udp_ops; 1980 1981 xprt->timeout = &xs_udp_default_timeout; 1982 1983 switch (addr->sa_family) { 1984 case AF_INET: 1985 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1986 xprt_set_bound(xprt); 1987 1988 INIT_DELAYED_WORK(&transport->connect_worker, 1989 xs_udp_connect_worker4); 1990 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 1991 break; 1992 case AF_INET6: 1993 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 1994 xprt_set_bound(xprt); 1995 1996 INIT_DELAYED_WORK(&transport->connect_worker, 1997 xs_udp_connect_worker6); 1998 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 1999 break; 2000 default: 2001 kfree(xprt); 2002 return ERR_PTR(-EAFNOSUPPORT); 2003 } 2004 2005 dprintk("RPC: set up transport to address %s\n", 2006 xprt->address_strings[RPC_DISPLAY_ALL]); 2007 2008 if (try_module_get(THIS_MODULE)) 2009 return xprt; 2010 2011 kfree(xprt->slot); 2012 kfree(xprt); 2013 return ERR_PTR(-EINVAL); 2014 } 2015 2016 static const struct rpc_timeout xs_tcp_default_timeout = { 2017 .to_initval = 60 * HZ, 2018 .to_maxval = 60 * HZ, 2019 .to_retries = 2, 2020 }; 2021 2022 /** 2023 * xs_setup_tcp - Set up transport to use a TCP socket 2024 * @args: rpc transport creation arguments 2025 * 2026 */ 2027 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2028 { 2029 struct sockaddr *addr = args->dstaddr; 2030 struct rpc_xprt *xprt; 2031 struct sock_xprt *transport; 2032 2033 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2034 if (IS_ERR(xprt)) 2035 return xprt; 2036 transport = container_of(xprt, struct sock_xprt, xprt); 2037 2038 xprt->prot = IPPROTO_TCP; 2039 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2040 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2041 2042 xprt->bind_timeout = XS_BIND_TO; 2043 xprt->connect_timeout = XS_TCP_CONN_TO; 2044 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2045 xprt->idle_timeout = XS_IDLE_DISC_TO; 2046 2047 xprt->ops = &xs_tcp_ops; 2048 xprt->timeout = &xs_tcp_default_timeout; 2049 2050 switch (addr->sa_family) { 2051 case AF_INET: 2052 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2053 xprt_set_bound(xprt); 2054 2055 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); 2056 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2057 break; 2058 case AF_INET6: 2059 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2060 xprt_set_bound(xprt); 2061 2062 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); 2063 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2064 break; 2065 default: 2066 kfree(xprt); 2067 return ERR_PTR(-EAFNOSUPPORT); 2068 } 2069 2070 dprintk("RPC: set up transport to address %s\n", 2071 xprt->address_strings[RPC_DISPLAY_ALL]); 2072 2073 if (try_module_get(THIS_MODULE)) 2074 return xprt; 2075 2076 kfree(xprt->slot); 2077 kfree(xprt); 2078 return ERR_PTR(-EINVAL); 2079 } 2080 2081 static struct xprt_class xs_udp_transport = { 2082 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2083 .name = "udp", 2084 .owner = THIS_MODULE, 2085 .ident = IPPROTO_UDP, 2086 .setup = xs_setup_udp, 2087 }; 2088 2089 static struct xprt_class xs_tcp_transport = { 2090 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2091 .name = "tcp", 2092 .owner = THIS_MODULE, 2093 .ident = IPPROTO_TCP, 2094 .setup = xs_setup_tcp, 2095 }; 2096 2097 /** 2098 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2099 * 2100 */ 2101 int init_socket_xprt(void) 2102 { 2103 #ifdef RPC_DEBUG 2104 if (!sunrpc_table_header) 2105 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2106 #endif 2107 2108 xprt_register_transport(&xs_udp_transport); 2109 xprt_register_transport(&xs_tcp_transport); 2110 2111 return 0; 2112 } 2113 2114 /** 2115 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2116 * 2117 */ 2118 void cleanup_socket_xprt(void) 2119 { 2120 #ifdef RPC_DEBUG 2121 if (sunrpc_table_header) { 2122 unregister_sysctl_table(sunrpc_table_header); 2123 sunrpc_table_header = NULL; 2124 } 2125 #endif 2126 2127 xprt_unregister_transport(&xs_udp_transport); 2128 xprt_unregister_transport(&xs_tcp_transport); 2129 } 2130