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 const char *protocol, 285 const char *netid) 286 { 287 struct sockaddr_in *addr = xs_addr_in(xprt); 288 char *buf; 289 290 buf = kzalloc(20, GFP_KERNEL); 291 if (buf) { 292 snprintf(buf, 20, NIPQUAD_FMT, 293 NIPQUAD(addr->sin_addr.s_addr)); 294 } 295 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 296 297 buf = kzalloc(8, GFP_KERNEL); 298 if (buf) { 299 snprintf(buf, 8, "%u", 300 ntohs(addr->sin_port)); 301 } 302 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 303 304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 305 306 buf = kzalloc(48, GFP_KERNEL); 307 if (buf) { 308 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", 309 NIPQUAD(addr->sin_addr.s_addr), 310 ntohs(addr->sin_port), 311 protocol); 312 } 313 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 314 315 buf = kzalloc(10, GFP_KERNEL); 316 if (buf) { 317 snprintf(buf, 10, "%02x%02x%02x%02x", 318 NIPQUAD(addr->sin_addr.s_addr)); 319 } 320 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 321 322 buf = kzalloc(8, GFP_KERNEL); 323 if (buf) { 324 snprintf(buf, 8, "%4hx", 325 ntohs(addr->sin_port)); 326 } 327 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 328 329 buf = kzalloc(30, GFP_KERNEL); 330 if (buf) { 331 snprintf(buf, 30, NIPQUAD_FMT".%u.%u", 332 NIPQUAD(addr->sin_addr.s_addr), 333 ntohs(addr->sin_port) >> 8, 334 ntohs(addr->sin_port) & 0xff); 335 } 336 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 337 338 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 339 } 340 341 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, 342 const char *protocol, 343 const char *netid) 344 { 345 struct sockaddr_in6 *addr = xs_addr_in6(xprt); 346 char *buf; 347 348 buf = kzalloc(40, GFP_KERNEL); 349 if (buf) { 350 snprintf(buf, 40, NIP6_FMT, 351 NIP6(addr->sin6_addr)); 352 } 353 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 354 355 buf = kzalloc(8, GFP_KERNEL); 356 if (buf) { 357 snprintf(buf, 8, "%u", 358 ntohs(addr->sin6_port)); 359 } 360 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 361 362 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 363 364 buf = kzalloc(64, GFP_KERNEL); 365 if (buf) { 366 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s", 367 NIP6(addr->sin6_addr), 368 ntohs(addr->sin6_port), 369 protocol); 370 } 371 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 372 373 buf = kzalloc(36, GFP_KERNEL); 374 if (buf) { 375 snprintf(buf, 36, NIP6_SEQFMT, 376 NIP6(addr->sin6_addr)); 377 } 378 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 379 380 buf = kzalloc(8, GFP_KERNEL); 381 if (buf) { 382 snprintf(buf, 8, "%4hx", 383 ntohs(addr->sin6_port)); 384 } 385 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 386 387 buf = kzalloc(50, GFP_KERNEL); 388 if (buf) { 389 snprintf(buf, 50, NIP6_FMT".%u.%u", 390 NIP6(addr->sin6_addr), 391 ntohs(addr->sin6_port) >> 8, 392 ntohs(addr->sin6_port) & 0xff); 393 } 394 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 395 396 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 397 } 398 399 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 400 { 401 unsigned int i; 402 403 for (i = 0; i < RPC_DISPLAY_MAX; i++) 404 switch (i) { 405 case RPC_DISPLAY_PROTO: 406 case RPC_DISPLAY_NETID: 407 continue; 408 default: 409 kfree(xprt->address_strings[i]); 410 } 411 } 412 413 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 414 415 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 416 { 417 struct msghdr msg = { 418 .msg_name = addr, 419 .msg_namelen = addrlen, 420 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 421 }; 422 struct kvec iov = { 423 .iov_base = vec->iov_base + base, 424 .iov_len = vec->iov_len - base, 425 }; 426 427 if (iov.iov_len != 0) 428 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 429 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 430 } 431 432 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 433 { 434 struct page **ppage; 435 unsigned int remainder; 436 int err, sent = 0; 437 438 remainder = xdr->page_len - base; 439 base += xdr->page_base; 440 ppage = xdr->pages + (base >> PAGE_SHIFT); 441 base &= ~PAGE_MASK; 442 for(;;) { 443 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 444 int flags = XS_SENDMSG_FLAGS; 445 446 remainder -= len; 447 if (remainder != 0 || more) 448 flags |= MSG_MORE; 449 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 450 if (remainder == 0 || err != len) 451 break; 452 sent += err; 453 ppage++; 454 base = 0; 455 } 456 if (sent == 0) 457 return err; 458 if (err > 0) 459 sent += err; 460 return sent; 461 } 462 463 /** 464 * xs_sendpages - write pages directly to a socket 465 * @sock: socket to send on 466 * @addr: UDP only -- address of destination 467 * @addrlen: UDP only -- length of destination address 468 * @xdr: buffer containing this request 469 * @base: starting position in the buffer 470 * 471 */ 472 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 473 { 474 unsigned int remainder = xdr->len - base; 475 int err, sent = 0; 476 477 if (unlikely(!sock)) 478 return -ENOTCONN; 479 480 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 481 if (base != 0) { 482 addr = NULL; 483 addrlen = 0; 484 } 485 486 if (base < xdr->head[0].iov_len || addr != NULL) { 487 unsigned int len = xdr->head[0].iov_len - base; 488 remainder -= len; 489 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 490 if (remainder == 0 || err != len) 491 goto out; 492 sent += err; 493 base = 0; 494 } else 495 base -= xdr->head[0].iov_len; 496 497 if (base < xdr->page_len) { 498 unsigned int len = xdr->page_len - base; 499 remainder -= len; 500 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 501 if (remainder == 0 || err != len) 502 goto out; 503 sent += err; 504 base = 0; 505 } else 506 base -= xdr->page_len; 507 508 if (base >= xdr->tail[0].iov_len) 509 return sent; 510 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 511 out: 512 if (sent == 0) 513 return err; 514 if (err > 0) 515 sent += err; 516 return sent; 517 } 518 519 /** 520 * xs_nospace - place task on wait queue if transmit was incomplete 521 * @task: task to put to sleep 522 * 523 */ 524 static void xs_nospace(struct rpc_task *task) 525 { 526 struct rpc_rqst *req = task->tk_rqstp; 527 struct rpc_xprt *xprt = req->rq_xprt; 528 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 529 530 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 531 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 532 req->rq_slen); 533 534 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 535 /* Protect against races with write_space */ 536 spin_lock_bh(&xprt->transport_lock); 537 538 /* Don't race with disconnect */ 539 if (!xprt_connected(xprt)) 540 task->tk_status = -ENOTCONN; 541 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 542 xprt_wait_for_buffer_space(task); 543 544 spin_unlock_bh(&xprt->transport_lock); 545 } else 546 /* Keep holding the socket if it is blocked */ 547 rpc_delay(task, HZ>>4); 548 } 549 550 /** 551 * xs_udp_send_request - write an RPC request to a UDP socket 552 * @task: address of RPC task that manages the state of an RPC request 553 * 554 * Return values: 555 * 0: The request has been sent 556 * EAGAIN: The socket was blocked, please call again later to 557 * complete the request 558 * ENOTCONN: Caller needs to invoke connect logic then call again 559 * other: Some other error occured, the request was not sent 560 */ 561 static int xs_udp_send_request(struct rpc_task *task) 562 { 563 struct rpc_rqst *req = task->tk_rqstp; 564 struct rpc_xprt *xprt = req->rq_xprt; 565 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 566 struct xdr_buf *xdr = &req->rq_snd_buf; 567 int status; 568 569 xs_pktdump("packet data:", 570 req->rq_svec->iov_base, 571 req->rq_svec->iov_len); 572 573 req->rq_xtime = jiffies; 574 status = xs_sendpages(transport->sock, 575 xs_addr(xprt), 576 xprt->addrlen, xdr, 577 req->rq_bytes_sent); 578 579 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 580 xdr->len - req->rq_bytes_sent, status); 581 582 if (status >= 0) { 583 task->tk_bytes_sent += status; 584 if (status >= req->rq_slen) 585 return 0; 586 /* Still some bytes left; set up for a retry later. */ 587 status = -EAGAIN; 588 } 589 590 switch (status) { 591 case -ENETUNREACH: 592 case -EPIPE: 593 case -ECONNREFUSED: 594 /* When the server has died, an ICMP port unreachable message 595 * prompts ECONNREFUSED. */ 596 break; 597 case -EAGAIN: 598 xs_nospace(task); 599 break; 600 default: 601 dprintk("RPC: sendmsg returned unrecognized error %d\n", 602 -status); 603 break; 604 } 605 606 return status; 607 } 608 609 /** 610 * xs_tcp_shutdown - gracefully shut down a TCP socket 611 * @xprt: transport 612 * 613 * Initiates a graceful shutdown of the TCP socket by calling the 614 * equivalent of shutdown(SHUT_WR); 615 */ 616 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 617 { 618 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 619 struct socket *sock = transport->sock; 620 621 if (sock != NULL) 622 kernel_sock_shutdown(sock, SHUT_WR); 623 } 624 625 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 626 { 627 u32 reclen = buf->len - sizeof(rpc_fraghdr); 628 rpc_fraghdr *base = buf->head[0].iov_base; 629 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 630 } 631 632 /** 633 * xs_tcp_send_request - write an RPC request to a TCP socket 634 * @task: address of RPC task that manages the state of an RPC request 635 * 636 * Return values: 637 * 0: The request has been sent 638 * EAGAIN: The socket was blocked, please call again later to 639 * complete the request 640 * ENOTCONN: Caller needs to invoke connect logic then call again 641 * other: Some other error occured, the request was not sent 642 * 643 * XXX: In the case of soft timeouts, should we eventually give up 644 * if sendmsg is not able to make progress? 645 */ 646 static int xs_tcp_send_request(struct rpc_task *task) 647 { 648 struct rpc_rqst *req = task->tk_rqstp; 649 struct rpc_xprt *xprt = req->rq_xprt; 650 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 651 struct xdr_buf *xdr = &req->rq_snd_buf; 652 int status; 653 unsigned int retry = 0; 654 655 xs_encode_tcp_record_marker(&req->rq_snd_buf); 656 657 xs_pktdump("packet data:", 658 req->rq_svec->iov_base, 659 req->rq_svec->iov_len); 660 661 /* Continue transmitting the packet/record. We must be careful 662 * to cope with writespace callbacks arriving _after_ we have 663 * called sendmsg(). */ 664 while (1) { 665 req->rq_xtime = jiffies; 666 status = xs_sendpages(transport->sock, 667 NULL, 0, xdr, req->rq_bytes_sent); 668 669 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 670 xdr->len - req->rq_bytes_sent, status); 671 672 if (unlikely(status < 0)) 673 break; 674 675 /* If we've sent the entire packet, immediately 676 * reset the count of bytes sent. */ 677 req->rq_bytes_sent += status; 678 task->tk_bytes_sent += status; 679 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 680 req->rq_bytes_sent = 0; 681 return 0; 682 } 683 684 status = -EAGAIN; 685 if (retry++ > XS_SENDMSG_RETRY) 686 break; 687 } 688 689 switch (status) { 690 case -EAGAIN: 691 xs_nospace(task); 692 break; 693 case -ECONNREFUSED: 694 case -ECONNRESET: 695 case -ENOTCONN: 696 case -EPIPE: 697 status = -ENOTCONN; 698 break; 699 default: 700 dprintk("RPC: sendmsg returned unrecognized error %d\n", 701 -status); 702 xs_tcp_shutdown(xprt); 703 break; 704 } 705 706 return status; 707 } 708 709 /** 710 * xs_tcp_release_xprt - clean up after a tcp transmission 711 * @xprt: transport 712 * @task: rpc task 713 * 714 * This cleans up if an error causes us to abort the transmission of a request. 715 * In this case, the socket may need to be reset in order to avoid confusing 716 * the server. 717 */ 718 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 719 { 720 struct rpc_rqst *req; 721 722 if (task != xprt->snd_task) 723 return; 724 if (task == NULL) 725 goto out_release; 726 req = task->tk_rqstp; 727 if (req->rq_bytes_sent == 0) 728 goto out_release; 729 if (req->rq_bytes_sent == req->rq_snd_buf.len) 730 goto out_release; 731 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 732 out_release: 733 xprt_release_xprt(xprt, task); 734 } 735 736 /** 737 * xs_close - close a socket 738 * @xprt: transport 739 * 740 * This is used when all requests are complete; ie, no DRC state remains 741 * on the server we want to save. 742 */ 743 static void xs_close(struct rpc_xprt *xprt) 744 { 745 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 746 struct socket *sock = transport->sock; 747 struct sock *sk = transport->inet; 748 749 if (!sk) 750 goto clear_close_wait; 751 752 dprintk("RPC: xs_close xprt %p\n", xprt); 753 754 write_lock_bh(&sk->sk_callback_lock); 755 transport->inet = NULL; 756 transport->sock = NULL; 757 758 sk->sk_user_data = NULL; 759 sk->sk_data_ready = transport->old_data_ready; 760 sk->sk_state_change = transport->old_state_change; 761 sk->sk_write_space = transport->old_write_space; 762 write_unlock_bh(&sk->sk_callback_lock); 763 764 sk->sk_no_check = 0; 765 766 sock_release(sock); 767 clear_close_wait: 768 smp_mb__before_clear_bit(); 769 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 770 clear_bit(XPRT_CLOSING, &xprt->state); 771 smp_mb__after_clear_bit(); 772 xprt_disconnect_done(xprt); 773 } 774 775 /** 776 * xs_destroy - prepare to shutdown a transport 777 * @xprt: doomed transport 778 * 779 */ 780 static void xs_destroy(struct rpc_xprt *xprt) 781 { 782 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 783 784 dprintk("RPC: xs_destroy xprt %p\n", xprt); 785 786 cancel_rearming_delayed_work(&transport->connect_worker); 787 788 xs_close(xprt); 789 xs_free_peer_addresses(xprt); 790 kfree(xprt->slot); 791 kfree(xprt); 792 module_put(THIS_MODULE); 793 } 794 795 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 796 { 797 return (struct rpc_xprt *) sk->sk_user_data; 798 } 799 800 /** 801 * xs_udp_data_ready - "data ready" callback for UDP sockets 802 * @sk: socket with data to read 803 * @len: how much data to read 804 * 805 */ 806 static void xs_udp_data_ready(struct sock *sk, int len) 807 { 808 struct rpc_task *task; 809 struct rpc_xprt *xprt; 810 struct rpc_rqst *rovr; 811 struct sk_buff *skb; 812 int err, repsize, copied; 813 u32 _xid; 814 __be32 *xp; 815 816 read_lock(&sk->sk_callback_lock); 817 dprintk("RPC: xs_udp_data_ready...\n"); 818 if (!(xprt = xprt_from_sock(sk))) 819 goto out; 820 821 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 822 goto out; 823 824 if (xprt->shutdown) 825 goto dropit; 826 827 repsize = skb->len - sizeof(struct udphdr); 828 if (repsize < 4) { 829 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 830 goto dropit; 831 } 832 833 /* Copy the XID from the skb... */ 834 xp = skb_header_pointer(skb, sizeof(struct udphdr), 835 sizeof(_xid), &_xid); 836 if (xp == NULL) 837 goto dropit; 838 839 /* Look up and lock the request corresponding to the given XID */ 840 spin_lock(&xprt->transport_lock); 841 rovr = xprt_lookup_rqst(xprt, *xp); 842 if (!rovr) 843 goto out_unlock; 844 task = rovr->rq_task; 845 846 if ((copied = rovr->rq_private_buf.buflen) > repsize) 847 copied = repsize; 848 849 /* Suck it into the iovec, verify checksum if not done by hw. */ 850 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 851 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 852 goto out_unlock; 853 } 854 855 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 856 857 /* Something worked... */ 858 dst_confirm(skb->dst); 859 860 xprt_adjust_cwnd(task, copied); 861 xprt_update_rtt(task); 862 xprt_complete_rqst(task, copied); 863 864 out_unlock: 865 spin_unlock(&xprt->transport_lock); 866 dropit: 867 skb_free_datagram(sk, skb); 868 out: 869 read_unlock(&sk->sk_callback_lock); 870 } 871 872 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 873 { 874 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 875 size_t len, used; 876 char *p; 877 878 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 879 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 880 used = xdr_skb_read_bits(desc, p, len); 881 transport->tcp_offset += used; 882 if (used != len) 883 return; 884 885 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 886 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 887 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 888 else 889 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 890 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 891 892 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 893 transport->tcp_offset = 0; 894 895 /* Sanity check of the record length */ 896 if (unlikely(transport->tcp_reclen < 4)) { 897 dprintk("RPC: invalid TCP record fragment length\n"); 898 xprt_force_disconnect(xprt); 899 return; 900 } 901 dprintk("RPC: reading TCP record fragment of length %d\n", 902 transport->tcp_reclen); 903 } 904 905 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 906 { 907 if (transport->tcp_offset == transport->tcp_reclen) { 908 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 909 transport->tcp_offset = 0; 910 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 911 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 912 transport->tcp_flags |= TCP_RCV_COPY_XID; 913 transport->tcp_copied = 0; 914 } 915 } 916 } 917 918 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 919 { 920 size_t len, used; 921 char *p; 922 923 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 924 dprintk("RPC: reading XID (%Zu bytes)\n", len); 925 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 926 used = xdr_skb_read_bits(desc, p, len); 927 transport->tcp_offset += used; 928 if (used != len) 929 return; 930 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 931 transport->tcp_flags |= TCP_RCV_COPY_DATA; 932 transport->tcp_copied = 4; 933 dprintk("RPC: reading reply for XID %08x\n", 934 ntohl(transport->tcp_xid)); 935 xs_tcp_check_fraghdr(transport); 936 } 937 938 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 939 { 940 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 941 struct rpc_rqst *req; 942 struct xdr_buf *rcvbuf; 943 size_t len; 944 ssize_t r; 945 946 /* Find and lock the request corresponding to this xid */ 947 spin_lock(&xprt->transport_lock); 948 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 949 if (!req) { 950 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 951 dprintk("RPC: XID %08x request not found!\n", 952 ntohl(transport->tcp_xid)); 953 spin_unlock(&xprt->transport_lock); 954 return; 955 } 956 957 rcvbuf = &req->rq_private_buf; 958 len = desc->count; 959 if (len > transport->tcp_reclen - transport->tcp_offset) { 960 struct xdr_skb_reader my_desc; 961 962 len = transport->tcp_reclen - transport->tcp_offset; 963 memcpy(&my_desc, desc, sizeof(my_desc)); 964 my_desc.count = len; 965 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 966 &my_desc, xdr_skb_read_bits); 967 desc->count -= r; 968 desc->offset += r; 969 } else 970 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 971 desc, xdr_skb_read_bits); 972 973 if (r > 0) { 974 transport->tcp_copied += r; 975 transport->tcp_offset += r; 976 } 977 if (r != len) { 978 /* Error when copying to the receive buffer, 979 * usually because we weren't able to allocate 980 * additional buffer pages. All we can do now 981 * is turn off TCP_RCV_COPY_DATA, so the request 982 * will not receive any additional updates, 983 * and time out. 984 * Any remaining data from this record will 985 * be discarded. 986 */ 987 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 988 dprintk("RPC: XID %08x truncated request\n", 989 ntohl(transport->tcp_xid)); 990 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 991 "tcp_offset = %u, tcp_reclen = %u\n", 992 xprt, transport->tcp_copied, 993 transport->tcp_offset, transport->tcp_reclen); 994 goto out; 995 } 996 997 dprintk("RPC: XID %08x read %Zd bytes\n", 998 ntohl(transport->tcp_xid), r); 999 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1000 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1001 transport->tcp_offset, transport->tcp_reclen); 1002 1003 if (transport->tcp_copied == req->rq_private_buf.buflen) 1004 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1005 else if (transport->tcp_offset == transport->tcp_reclen) { 1006 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1007 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1008 } 1009 1010 out: 1011 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1012 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1013 spin_unlock(&xprt->transport_lock); 1014 xs_tcp_check_fraghdr(transport); 1015 } 1016 1017 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1018 { 1019 size_t len; 1020 1021 len = transport->tcp_reclen - transport->tcp_offset; 1022 if (len > desc->count) 1023 len = desc->count; 1024 desc->count -= len; 1025 desc->offset += len; 1026 transport->tcp_offset += len; 1027 dprintk("RPC: discarded %Zu bytes\n", len); 1028 xs_tcp_check_fraghdr(transport); 1029 } 1030 1031 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1032 { 1033 struct rpc_xprt *xprt = rd_desc->arg.data; 1034 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1035 struct xdr_skb_reader desc = { 1036 .skb = skb, 1037 .offset = offset, 1038 .count = len, 1039 }; 1040 1041 dprintk("RPC: xs_tcp_data_recv started\n"); 1042 do { 1043 /* Read in a new fragment marker if necessary */ 1044 /* Can we ever really expect to get completely empty fragments? */ 1045 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1046 xs_tcp_read_fraghdr(xprt, &desc); 1047 continue; 1048 } 1049 /* Read in the xid if necessary */ 1050 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1051 xs_tcp_read_xid(transport, &desc); 1052 continue; 1053 } 1054 /* Read in the request data */ 1055 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1056 xs_tcp_read_request(xprt, &desc); 1057 continue; 1058 } 1059 /* Skip over any trailing bytes on short reads */ 1060 xs_tcp_read_discard(transport, &desc); 1061 } while (desc.count); 1062 dprintk("RPC: xs_tcp_data_recv done\n"); 1063 return len - desc.count; 1064 } 1065 1066 /** 1067 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1068 * @sk: socket with data to read 1069 * @bytes: how much data to read 1070 * 1071 */ 1072 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1073 { 1074 struct rpc_xprt *xprt; 1075 read_descriptor_t rd_desc; 1076 1077 dprintk("RPC: xs_tcp_data_ready...\n"); 1078 1079 read_lock(&sk->sk_callback_lock); 1080 if (!(xprt = xprt_from_sock(sk))) 1081 goto out; 1082 if (xprt->shutdown) 1083 goto out; 1084 1085 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1086 rd_desc.arg.data = xprt; 1087 rd_desc.count = 65536; 1088 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1089 out: 1090 read_unlock(&sk->sk_callback_lock); 1091 } 1092 1093 /** 1094 * xs_tcp_state_change - callback to handle TCP socket state changes 1095 * @sk: socket whose state has changed 1096 * 1097 */ 1098 static void xs_tcp_state_change(struct sock *sk) 1099 { 1100 struct rpc_xprt *xprt; 1101 1102 read_lock(&sk->sk_callback_lock); 1103 if (!(xprt = xprt_from_sock(sk))) 1104 goto out; 1105 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1106 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1107 sk->sk_state, xprt_connected(xprt), 1108 sock_flag(sk, SOCK_DEAD), 1109 sock_flag(sk, SOCK_ZAPPED)); 1110 1111 switch (sk->sk_state) { 1112 case TCP_ESTABLISHED: 1113 spin_lock_bh(&xprt->transport_lock); 1114 if (!xprt_test_and_set_connected(xprt)) { 1115 struct sock_xprt *transport = container_of(xprt, 1116 struct sock_xprt, xprt); 1117 1118 /* Reset TCP record info */ 1119 transport->tcp_offset = 0; 1120 transport->tcp_reclen = 0; 1121 transport->tcp_copied = 0; 1122 transport->tcp_flags = 1123 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1124 1125 xprt_wake_pending_tasks(xprt, 0); 1126 } 1127 spin_unlock_bh(&xprt->transport_lock); 1128 break; 1129 case TCP_FIN_WAIT1: 1130 /* The client initiated a shutdown of the socket */ 1131 xprt->reestablish_timeout = 0; 1132 set_bit(XPRT_CLOSING, &xprt->state); 1133 smp_mb__before_clear_bit(); 1134 clear_bit(XPRT_CONNECTED, &xprt->state); 1135 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1136 smp_mb__after_clear_bit(); 1137 break; 1138 case TCP_CLOSE_WAIT: 1139 /* The server initiated a shutdown of the socket */ 1140 set_bit(XPRT_CLOSING, &xprt->state); 1141 xprt_force_disconnect(xprt); 1142 case TCP_SYN_SENT: 1143 case TCP_CLOSING: 1144 /* 1145 * If the server closed down the connection, make sure that 1146 * we back off before reconnecting 1147 */ 1148 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1149 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1150 break; 1151 case TCP_LAST_ACK: 1152 smp_mb__before_clear_bit(); 1153 clear_bit(XPRT_CONNECTED, &xprt->state); 1154 smp_mb__after_clear_bit(); 1155 break; 1156 case TCP_CLOSE: 1157 smp_mb__before_clear_bit(); 1158 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1159 clear_bit(XPRT_CLOSING, &xprt->state); 1160 smp_mb__after_clear_bit(); 1161 /* Mark transport as closed and wake up all pending tasks */ 1162 xprt_disconnect_done(xprt); 1163 } 1164 out: 1165 read_unlock(&sk->sk_callback_lock); 1166 } 1167 1168 /** 1169 * xs_udp_write_space - callback invoked when socket buffer space 1170 * becomes available 1171 * @sk: socket whose state has changed 1172 * 1173 * Called when more output buffer space is available for this socket. 1174 * We try not to wake our writers until they can make "significant" 1175 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1176 * with a bunch of small requests. 1177 */ 1178 static void xs_udp_write_space(struct sock *sk) 1179 { 1180 read_lock(&sk->sk_callback_lock); 1181 1182 /* from net/core/sock.c:sock_def_write_space */ 1183 if (sock_writeable(sk)) { 1184 struct socket *sock; 1185 struct rpc_xprt *xprt; 1186 1187 if (unlikely(!(sock = sk->sk_socket))) 1188 goto out; 1189 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1190 goto out; 1191 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 1192 goto out; 1193 1194 xprt_write_space(xprt); 1195 } 1196 1197 out: 1198 read_unlock(&sk->sk_callback_lock); 1199 } 1200 1201 /** 1202 * xs_tcp_write_space - callback invoked when socket buffer space 1203 * becomes available 1204 * @sk: socket whose state has changed 1205 * 1206 * Called when more output buffer space is available for this socket. 1207 * We try not to wake our writers until they can make "significant" 1208 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1209 * with a bunch of small requests. 1210 */ 1211 static void xs_tcp_write_space(struct sock *sk) 1212 { 1213 read_lock(&sk->sk_callback_lock); 1214 1215 /* from net/core/stream.c:sk_stream_write_space */ 1216 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 1217 struct socket *sock; 1218 struct rpc_xprt *xprt; 1219 1220 if (unlikely(!(sock = sk->sk_socket))) 1221 goto out; 1222 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1223 goto out; 1224 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 1225 goto out; 1226 1227 xprt_write_space(xprt); 1228 } 1229 1230 out: 1231 read_unlock(&sk->sk_callback_lock); 1232 } 1233 1234 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1235 { 1236 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1237 struct sock *sk = transport->inet; 1238 1239 if (transport->rcvsize) { 1240 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1241 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1242 } 1243 if (transport->sndsize) { 1244 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1245 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1246 sk->sk_write_space(sk); 1247 } 1248 } 1249 1250 /** 1251 * xs_udp_set_buffer_size - set send and receive limits 1252 * @xprt: generic transport 1253 * @sndsize: requested size of send buffer, in bytes 1254 * @rcvsize: requested size of receive buffer, in bytes 1255 * 1256 * Set socket send and receive buffer size limits. 1257 */ 1258 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1259 { 1260 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1261 1262 transport->sndsize = 0; 1263 if (sndsize) 1264 transport->sndsize = sndsize + 1024; 1265 transport->rcvsize = 0; 1266 if (rcvsize) 1267 transport->rcvsize = rcvsize + 1024; 1268 1269 xs_udp_do_set_buffer_size(xprt); 1270 } 1271 1272 /** 1273 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1274 * @task: task that timed out 1275 * 1276 * Adjust the congestion window after a retransmit timeout has occurred. 1277 */ 1278 static void xs_udp_timer(struct rpc_task *task) 1279 { 1280 xprt_adjust_cwnd(task, -ETIMEDOUT); 1281 } 1282 1283 static unsigned short xs_get_random_port(void) 1284 { 1285 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1286 unsigned short rand = (unsigned short) net_random() % range; 1287 return rand + xprt_min_resvport; 1288 } 1289 1290 /** 1291 * xs_set_port - reset the port number in the remote endpoint address 1292 * @xprt: generic transport 1293 * @port: new port number 1294 * 1295 */ 1296 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1297 { 1298 struct sockaddr *addr = xs_addr(xprt); 1299 1300 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1301 1302 switch (addr->sa_family) { 1303 case AF_INET: 1304 ((struct sockaddr_in *)addr)->sin_port = htons(port); 1305 break; 1306 case AF_INET6: 1307 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); 1308 break; 1309 default: 1310 BUG(); 1311 } 1312 } 1313 1314 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1315 { 1316 unsigned short port = transport->port; 1317 1318 if (port == 0 && transport->xprt.resvport) 1319 port = xs_get_random_port(); 1320 return port; 1321 } 1322 1323 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1324 { 1325 if (transport->port != 0) 1326 transport->port = 0; 1327 if (!transport->xprt.resvport) 1328 return 0; 1329 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1330 return xprt_max_resvport; 1331 return --port; 1332 } 1333 1334 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1335 { 1336 struct sockaddr_in myaddr = { 1337 .sin_family = AF_INET, 1338 }; 1339 struct sockaddr_in *sa; 1340 int err, nloop = 0; 1341 unsigned short port = xs_get_srcport(transport, sock); 1342 unsigned short last; 1343 1344 sa = (struct sockaddr_in *)&transport->addr; 1345 myaddr.sin_addr = sa->sin_addr; 1346 do { 1347 myaddr.sin_port = htons(port); 1348 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1349 sizeof(myaddr)); 1350 if (port == 0) 1351 break; 1352 if (err == 0) { 1353 transport->port = port; 1354 break; 1355 } 1356 last = port; 1357 port = xs_next_srcport(transport, sock, port); 1358 if (port > last) 1359 nloop++; 1360 } while (err == -EADDRINUSE && nloop != 2); 1361 dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n", 1362 __func__, NIPQUAD(myaddr.sin_addr), 1363 port, err ? "failed" : "ok", err); 1364 return err; 1365 } 1366 1367 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1368 { 1369 struct sockaddr_in6 myaddr = { 1370 .sin6_family = AF_INET6, 1371 }; 1372 struct sockaddr_in6 *sa; 1373 int err, nloop = 0; 1374 unsigned short port = xs_get_srcport(transport, sock); 1375 unsigned short last; 1376 1377 sa = (struct sockaddr_in6 *)&transport->addr; 1378 myaddr.sin6_addr = sa->sin6_addr; 1379 do { 1380 myaddr.sin6_port = htons(port); 1381 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1382 sizeof(myaddr)); 1383 if (port == 0) 1384 break; 1385 if (err == 0) { 1386 transport->port = port; 1387 break; 1388 } 1389 last = port; 1390 port = xs_next_srcport(transport, sock, port); 1391 if (port > last) 1392 nloop++; 1393 } while (err == -EADDRINUSE && nloop != 2); 1394 dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n", 1395 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err); 1396 return err; 1397 } 1398 1399 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1400 static struct lock_class_key xs_key[2]; 1401 static struct lock_class_key xs_slock_key[2]; 1402 1403 static inline void xs_reclassify_socket4(struct socket *sock) 1404 { 1405 struct sock *sk = sock->sk; 1406 1407 BUG_ON(sock_owned_by_user(sk)); 1408 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1409 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1410 } 1411 1412 static inline void xs_reclassify_socket6(struct socket *sock) 1413 { 1414 struct sock *sk = sock->sk; 1415 1416 BUG_ON(sock_owned_by_user(sk)); 1417 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1418 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1419 } 1420 #else 1421 static inline void xs_reclassify_socket4(struct socket *sock) 1422 { 1423 } 1424 1425 static inline void xs_reclassify_socket6(struct socket *sock) 1426 { 1427 } 1428 #endif 1429 1430 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1431 { 1432 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1433 1434 if (!transport->inet) { 1435 struct sock *sk = sock->sk; 1436 1437 write_lock_bh(&sk->sk_callback_lock); 1438 1439 sk->sk_user_data = xprt; 1440 transport->old_data_ready = sk->sk_data_ready; 1441 transport->old_state_change = sk->sk_state_change; 1442 transport->old_write_space = sk->sk_write_space; 1443 sk->sk_data_ready = xs_udp_data_ready; 1444 sk->sk_write_space = xs_udp_write_space; 1445 sk->sk_no_check = UDP_CSUM_NORCV; 1446 sk->sk_allocation = GFP_ATOMIC; 1447 1448 xprt_set_connected(xprt); 1449 1450 /* Reset to new socket */ 1451 transport->sock = sock; 1452 transport->inet = sk; 1453 1454 write_unlock_bh(&sk->sk_callback_lock); 1455 } 1456 xs_udp_do_set_buffer_size(xprt); 1457 } 1458 1459 /** 1460 * xs_udp_connect_worker4 - set up a UDP socket 1461 * @work: RPC transport to connect 1462 * 1463 * Invoked by a work queue tasklet. 1464 */ 1465 static void xs_udp_connect_worker4(struct work_struct *work) 1466 { 1467 struct sock_xprt *transport = 1468 container_of(work, struct sock_xprt, connect_worker.work); 1469 struct rpc_xprt *xprt = &transport->xprt; 1470 struct socket *sock = transport->sock; 1471 int err, status = -EIO; 1472 1473 if (xprt->shutdown || !xprt_bound(xprt)) 1474 goto out; 1475 1476 /* Start by resetting any existing state */ 1477 xs_close(xprt); 1478 1479 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1480 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1481 goto out; 1482 } 1483 xs_reclassify_socket4(sock); 1484 1485 if (xs_bind4(transport, sock)) { 1486 sock_release(sock); 1487 goto out; 1488 } 1489 1490 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1491 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1492 1493 xs_udp_finish_connecting(xprt, sock); 1494 status = 0; 1495 out: 1496 xprt_wake_pending_tasks(xprt, status); 1497 xprt_clear_connecting(xprt); 1498 } 1499 1500 /** 1501 * xs_udp_connect_worker6 - set up a UDP socket 1502 * @work: RPC transport to connect 1503 * 1504 * Invoked by a work queue tasklet. 1505 */ 1506 static void xs_udp_connect_worker6(struct work_struct *work) 1507 { 1508 struct sock_xprt *transport = 1509 container_of(work, struct sock_xprt, connect_worker.work); 1510 struct rpc_xprt *xprt = &transport->xprt; 1511 struct socket *sock = transport->sock; 1512 int err, status = -EIO; 1513 1514 if (xprt->shutdown || !xprt_bound(xprt)) 1515 goto out; 1516 1517 /* Start by resetting any existing state */ 1518 xs_close(xprt); 1519 1520 if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1521 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1522 goto out; 1523 } 1524 xs_reclassify_socket6(sock); 1525 1526 if (xs_bind6(transport, sock) < 0) { 1527 sock_release(sock); 1528 goto out; 1529 } 1530 1531 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1532 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1533 1534 xs_udp_finish_connecting(xprt, sock); 1535 status = 0; 1536 out: 1537 xprt_wake_pending_tasks(xprt, status); 1538 xprt_clear_connecting(xprt); 1539 } 1540 1541 /* 1542 * We need to preserve the port number so the reply cache on the server can 1543 * find our cached RPC replies when we get around to reconnecting. 1544 */ 1545 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 1546 { 1547 int result; 1548 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1549 struct sockaddr any; 1550 1551 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1552 1553 /* 1554 * Disconnect the transport socket by doing a connect operation 1555 * with AF_UNSPEC. This should return immediately... 1556 */ 1557 memset(&any, 0, sizeof(any)); 1558 any.sa_family = AF_UNSPEC; 1559 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1560 if (result) 1561 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1562 result); 1563 } 1564 1565 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1566 { 1567 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1568 1569 if (!transport->inet) { 1570 struct sock *sk = sock->sk; 1571 1572 write_lock_bh(&sk->sk_callback_lock); 1573 1574 sk->sk_user_data = xprt; 1575 transport->old_data_ready = sk->sk_data_ready; 1576 transport->old_state_change = sk->sk_state_change; 1577 transport->old_write_space = sk->sk_write_space; 1578 sk->sk_data_ready = xs_tcp_data_ready; 1579 sk->sk_state_change = xs_tcp_state_change; 1580 sk->sk_write_space = xs_tcp_write_space; 1581 sk->sk_allocation = GFP_ATOMIC; 1582 1583 /* socket options */ 1584 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1585 sock_reset_flag(sk, SOCK_LINGER); 1586 tcp_sk(sk)->linger2 = 0; 1587 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1588 1589 xprt_clear_connected(xprt); 1590 1591 /* Reset to new socket */ 1592 transport->sock = sock; 1593 transport->inet = sk; 1594 1595 write_unlock_bh(&sk->sk_callback_lock); 1596 } 1597 1598 /* Tell the socket layer to start connecting... */ 1599 xprt->stat.connect_count++; 1600 xprt->stat.connect_start = jiffies; 1601 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1602 } 1603 1604 /** 1605 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1606 * @work: RPC transport to connect 1607 * 1608 * Invoked by a work queue tasklet. 1609 */ 1610 static void xs_tcp_connect_worker4(struct work_struct *work) 1611 { 1612 struct sock_xprt *transport = 1613 container_of(work, struct sock_xprt, connect_worker.work); 1614 struct rpc_xprt *xprt = &transport->xprt; 1615 struct socket *sock = transport->sock; 1616 int err, status = -EIO; 1617 1618 if (xprt->shutdown || !xprt_bound(xprt)) 1619 goto out; 1620 1621 if (!sock) { 1622 /* start from scratch */ 1623 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1624 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1625 goto out; 1626 } 1627 xs_reclassify_socket4(sock); 1628 1629 if (xs_bind4(transport, sock) < 0) { 1630 sock_release(sock); 1631 goto out; 1632 } 1633 } else 1634 /* "close" the socket, preserving the local port */ 1635 xs_tcp_reuse_connection(xprt); 1636 1637 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1638 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1639 1640 status = xs_tcp_finish_connecting(xprt, sock); 1641 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1642 xprt, -status, xprt_connected(xprt), 1643 sock->sk->sk_state); 1644 if (status < 0) { 1645 switch (status) { 1646 case -EINPROGRESS: 1647 case -EALREADY: 1648 goto out_clear; 1649 case -ECONNREFUSED: 1650 case -ECONNRESET: 1651 /* retry with existing socket, after a delay */ 1652 break; 1653 default: 1654 /* get rid of existing socket, and retry */ 1655 xs_tcp_shutdown(xprt); 1656 } 1657 } 1658 out: 1659 xprt_wake_pending_tasks(xprt, status); 1660 out_clear: 1661 xprt_clear_connecting(xprt); 1662 } 1663 1664 /** 1665 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1666 * @work: RPC transport to connect 1667 * 1668 * Invoked by a work queue tasklet. 1669 */ 1670 static void xs_tcp_connect_worker6(struct work_struct *work) 1671 { 1672 struct sock_xprt *transport = 1673 container_of(work, struct sock_xprt, connect_worker.work); 1674 struct rpc_xprt *xprt = &transport->xprt; 1675 struct socket *sock = transport->sock; 1676 int err, status = -EIO; 1677 1678 if (xprt->shutdown || !xprt_bound(xprt)) 1679 goto out; 1680 1681 if (!sock) { 1682 /* start from scratch */ 1683 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1684 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1685 goto out; 1686 } 1687 xs_reclassify_socket6(sock); 1688 1689 if (xs_bind6(transport, sock) < 0) { 1690 sock_release(sock); 1691 goto out; 1692 } 1693 } else 1694 /* "close" the socket, preserving the local port */ 1695 xs_tcp_reuse_connection(xprt); 1696 1697 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1698 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1699 1700 status = xs_tcp_finish_connecting(xprt, sock); 1701 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1702 xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1703 if (status < 0) { 1704 switch (status) { 1705 case -EINPROGRESS: 1706 case -EALREADY: 1707 goto out_clear; 1708 case -ECONNREFUSED: 1709 case -ECONNRESET: 1710 /* retry with existing socket, after a delay */ 1711 break; 1712 default: 1713 /* get rid of existing socket, and retry */ 1714 xs_tcp_shutdown(xprt); 1715 } 1716 } 1717 out: 1718 xprt_wake_pending_tasks(xprt, status); 1719 out_clear: 1720 xprt_clear_connecting(xprt); 1721 } 1722 1723 /** 1724 * xs_connect - connect a socket to a remote endpoint 1725 * @task: address of RPC task that manages state of connect request 1726 * 1727 * TCP: If the remote end dropped the connection, delay reconnecting. 1728 * 1729 * UDP socket connects are synchronous, but we use a work queue anyway 1730 * to guarantee that even unprivileged user processes can set up a 1731 * socket on a privileged port. 1732 * 1733 * If a UDP socket connect fails, the delay behavior here prevents 1734 * retry floods (hard mounts). 1735 */ 1736 static void xs_connect(struct rpc_task *task) 1737 { 1738 struct rpc_xprt *xprt = task->tk_xprt; 1739 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1740 1741 if (xprt_test_and_set_connecting(xprt)) 1742 return; 1743 1744 if (transport->sock != NULL) { 1745 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1746 "seconds\n", 1747 xprt, xprt->reestablish_timeout / HZ); 1748 queue_delayed_work(rpciod_workqueue, 1749 &transport->connect_worker, 1750 xprt->reestablish_timeout); 1751 xprt->reestablish_timeout <<= 1; 1752 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1753 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1754 } else { 1755 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1756 queue_delayed_work(rpciod_workqueue, 1757 &transport->connect_worker, 0); 1758 } 1759 } 1760 1761 static void xs_tcp_connect(struct rpc_task *task) 1762 { 1763 struct rpc_xprt *xprt = task->tk_xprt; 1764 1765 /* Initiate graceful shutdown of the socket if not already done */ 1766 if (test_bit(XPRT_CONNECTED, &xprt->state)) 1767 xs_tcp_shutdown(xprt); 1768 /* Exit if we need to wait for socket shutdown to complete */ 1769 if (test_bit(XPRT_CLOSING, &xprt->state)) 1770 return; 1771 xs_connect(task); 1772 } 1773 1774 /** 1775 * xs_udp_print_stats - display UDP socket-specifc stats 1776 * @xprt: rpc_xprt struct containing statistics 1777 * @seq: output file 1778 * 1779 */ 1780 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1781 { 1782 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1783 1784 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1785 transport->port, 1786 xprt->stat.bind_count, 1787 xprt->stat.sends, 1788 xprt->stat.recvs, 1789 xprt->stat.bad_xids, 1790 xprt->stat.req_u, 1791 xprt->stat.bklog_u); 1792 } 1793 1794 /** 1795 * xs_tcp_print_stats - display TCP socket-specifc stats 1796 * @xprt: rpc_xprt struct containing statistics 1797 * @seq: output file 1798 * 1799 */ 1800 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1801 { 1802 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1803 long idle_time = 0; 1804 1805 if (xprt_connected(xprt)) 1806 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1807 1808 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1809 transport->port, 1810 xprt->stat.bind_count, 1811 xprt->stat.connect_count, 1812 xprt->stat.connect_time, 1813 idle_time, 1814 xprt->stat.sends, 1815 xprt->stat.recvs, 1816 xprt->stat.bad_xids, 1817 xprt->stat.req_u, 1818 xprt->stat.bklog_u); 1819 } 1820 1821 static struct rpc_xprt_ops xs_udp_ops = { 1822 .set_buffer_size = xs_udp_set_buffer_size, 1823 .reserve_xprt = xprt_reserve_xprt_cong, 1824 .release_xprt = xprt_release_xprt_cong, 1825 .rpcbind = rpcb_getport_async, 1826 .set_port = xs_set_port, 1827 .connect = xs_connect, 1828 .buf_alloc = rpc_malloc, 1829 .buf_free = rpc_free, 1830 .send_request = xs_udp_send_request, 1831 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1832 .timer = xs_udp_timer, 1833 .release_request = xprt_release_rqst_cong, 1834 .close = xs_close, 1835 .destroy = xs_destroy, 1836 .print_stats = xs_udp_print_stats, 1837 }; 1838 1839 static struct rpc_xprt_ops xs_tcp_ops = { 1840 .reserve_xprt = xprt_reserve_xprt, 1841 .release_xprt = xs_tcp_release_xprt, 1842 .rpcbind = rpcb_getport_async, 1843 .set_port = xs_set_port, 1844 .connect = xs_tcp_connect, 1845 .buf_alloc = rpc_malloc, 1846 .buf_free = rpc_free, 1847 .send_request = xs_tcp_send_request, 1848 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1849 .close = xs_tcp_shutdown, 1850 .destroy = xs_destroy, 1851 .print_stats = xs_tcp_print_stats, 1852 }; 1853 1854 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 1855 unsigned int slot_table_size) 1856 { 1857 struct rpc_xprt *xprt; 1858 struct sock_xprt *new; 1859 1860 if (args->addrlen > sizeof(xprt->addr)) { 1861 dprintk("RPC: xs_setup_xprt: address too large\n"); 1862 return ERR_PTR(-EBADF); 1863 } 1864 1865 new = kzalloc(sizeof(*new), GFP_KERNEL); 1866 if (new == NULL) { 1867 dprintk("RPC: xs_setup_xprt: couldn't allocate " 1868 "rpc_xprt\n"); 1869 return ERR_PTR(-ENOMEM); 1870 } 1871 xprt = &new->xprt; 1872 1873 xprt->max_reqs = slot_table_size; 1874 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 1875 if (xprt->slot == NULL) { 1876 kfree(xprt); 1877 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 1878 "table\n"); 1879 return ERR_PTR(-ENOMEM); 1880 } 1881 1882 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 1883 xprt->addrlen = args->addrlen; 1884 if (args->srcaddr) 1885 memcpy(&new->addr, args->srcaddr, args->addrlen); 1886 1887 return xprt; 1888 } 1889 1890 static const struct rpc_timeout xs_udp_default_timeout = { 1891 .to_initval = 5 * HZ, 1892 .to_maxval = 30 * HZ, 1893 .to_increment = 5 * HZ, 1894 .to_retries = 5, 1895 }; 1896 1897 /** 1898 * xs_setup_udp - Set up transport to use a UDP socket 1899 * @args: rpc transport creation arguments 1900 * 1901 */ 1902 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 1903 { 1904 struct sockaddr *addr = args->dstaddr; 1905 struct rpc_xprt *xprt; 1906 struct sock_xprt *transport; 1907 1908 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 1909 if (IS_ERR(xprt)) 1910 return xprt; 1911 transport = container_of(xprt, struct sock_xprt, xprt); 1912 1913 xprt->prot = IPPROTO_UDP; 1914 xprt->tsh_size = 0; 1915 /* XXX: header size can vary due to auth type, IPv6, etc. */ 1916 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1917 1918 xprt->bind_timeout = XS_BIND_TO; 1919 xprt->connect_timeout = XS_UDP_CONN_TO; 1920 xprt->reestablish_timeout = XS_UDP_REEST_TO; 1921 xprt->idle_timeout = XS_IDLE_DISC_TO; 1922 1923 xprt->ops = &xs_udp_ops; 1924 1925 xprt->timeout = &xs_udp_default_timeout; 1926 1927 switch (addr->sa_family) { 1928 case AF_INET: 1929 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1930 xprt_set_bound(xprt); 1931 1932 INIT_DELAYED_WORK(&transport->connect_worker, 1933 xs_udp_connect_worker4); 1934 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 1935 break; 1936 case AF_INET6: 1937 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 1938 xprt_set_bound(xprt); 1939 1940 INIT_DELAYED_WORK(&transport->connect_worker, 1941 xs_udp_connect_worker6); 1942 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 1943 break; 1944 default: 1945 kfree(xprt); 1946 return ERR_PTR(-EAFNOSUPPORT); 1947 } 1948 1949 dprintk("RPC: set up transport to address %s\n", 1950 xprt->address_strings[RPC_DISPLAY_ALL]); 1951 1952 if (try_module_get(THIS_MODULE)) 1953 return xprt; 1954 1955 kfree(xprt->slot); 1956 kfree(xprt); 1957 return ERR_PTR(-EINVAL); 1958 } 1959 1960 static const struct rpc_timeout xs_tcp_default_timeout = { 1961 .to_initval = 60 * HZ, 1962 .to_maxval = 60 * HZ, 1963 .to_retries = 2, 1964 }; 1965 1966 /** 1967 * xs_setup_tcp - Set up transport to use a TCP socket 1968 * @args: rpc transport creation arguments 1969 * 1970 */ 1971 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 1972 { 1973 struct sockaddr *addr = args->dstaddr; 1974 struct rpc_xprt *xprt; 1975 struct sock_xprt *transport; 1976 1977 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 1978 if (IS_ERR(xprt)) 1979 return xprt; 1980 transport = container_of(xprt, struct sock_xprt, xprt); 1981 1982 xprt->prot = IPPROTO_TCP; 1983 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 1984 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 1985 1986 xprt->bind_timeout = XS_BIND_TO; 1987 xprt->connect_timeout = XS_TCP_CONN_TO; 1988 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1989 xprt->idle_timeout = XS_IDLE_DISC_TO; 1990 1991 xprt->ops = &xs_tcp_ops; 1992 xprt->timeout = &xs_tcp_default_timeout; 1993 1994 switch (addr->sa_family) { 1995 case AF_INET: 1996 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 1997 xprt_set_bound(xprt); 1998 1999 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); 2000 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2001 break; 2002 case AF_INET6: 2003 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2004 xprt_set_bound(xprt); 2005 2006 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); 2007 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2008 break; 2009 default: 2010 kfree(xprt); 2011 return ERR_PTR(-EAFNOSUPPORT); 2012 } 2013 2014 dprintk("RPC: set up transport to address %s\n", 2015 xprt->address_strings[RPC_DISPLAY_ALL]); 2016 2017 if (try_module_get(THIS_MODULE)) 2018 return xprt; 2019 2020 kfree(xprt->slot); 2021 kfree(xprt); 2022 return ERR_PTR(-EINVAL); 2023 } 2024 2025 static struct xprt_class xs_udp_transport = { 2026 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2027 .name = "udp", 2028 .owner = THIS_MODULE, 2029 .ident = IPPROTO_UDP, 2030 .setup = xs_setup_udp, 2031 }; 2032 2033 static struct xprt_class xs_tcp_transport = { 2034 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2035 .name = "tcp", 2036 .owner = THIS_MODULE, 2037 .ident = IPPROTO_TCP, 2038 .setup = xs_setup_tcp, 2039 }; 2040 2041 /** 2042 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2043 * 2044 */ 2045 int init_socket_xprt(void) 2046 { 2047 #ifdef RPC_DEBUG 2048 if (!sunrpc_table_header) 2049 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2050 #endif 2051 2052 xprt_register_transport(&xs_udp_transport); 2053 xprt_register_transport(&xs_tcp_transport); 2054 2055 return 0; 2056 } 2057 2058 /** 2059 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2060 * 2061 */ 2062 void cleanup_socket_xprt(void) 2063 { 2064 #ifdef RPC_DEBUG 2065 if (sunrpc_table_header) { 2066 unregister_sysctl_table(sunrpc_table_header); 2067 sunrpc_table_header = NULL; 2068 } 2069 #endif 2070 2071 xprt_unregister_transport(&xs_udp_transport); 2072 xprt_unregister_transport(&xs_tcp_transport); 2073 } 2074