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 #define XS_TCP_LINGER_TO (15U * HZ) 53 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 54 55 /* 56 * We can register our own files under /proc/sys/sunrpc by 57 * calling register_sysctl_table() again. The files in that 58 * directory become the union of all files registered there. 59 * 60 * We simply need to make sure that we don't collide with 61 * someone else's file names! 62 */ 63 64 #ifdef RPC_DEBUG 65 66 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 67 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 68 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 69 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 70 71 static struct ctl_table_header *sunrpc_table_header; 72 73 /* 74 * FIXME: changing the UDP slot table size should also resize the UDP 75 * socket buffers for existing UDP transports 76 */ 77 static ctl_table xs_tunables_table[] = { 78 { 79 .ctl_name = CTL_SLOTTABLE_UDP, 80 .procname = "udp_slot_table_entries", 81 .data = &xprt_udp_slot_table_entries, 82 .maxlen = sizeof(unsigned int), 83 .mode = 0644, 84 .proc_handler = &proc_dointvec_minmax, 85 .strategy = &sysctl_intvec, 86 .extra1 = &min_slot_table_size, 87 .extra2 = &max_slot_table_size 88 }, 89 { 90 .ctl_name = CTL_SLOTTABLE_TCP, 91 .procname = "tcp_slot_table_entries", 92 .data = &xprt_tcp_slot_table_entries, 93 .maxlen = sizeof(unsigned int), 94 .mode = 0644, 95 .proc_handler = &proc_dointvec_minmax, 96 .strategy = &sysctl_intvec, 97 .extra1 = &min_slot_table_size, 98 .extra2 = &max_slot_table_size 99 }, 100 { 101 .ctl_name = CTL_MIN_RESVPORT, 102 .procname = "min_resvport", 103 .data = &xprt_min_resvport, 104 .maxlen = sizeof(unsigned int), 105 .mode = 0644, 106 .proc_handler = &proc_dointvec_minmax, 107 .strategy = &sysctl_intvec, 108 .extra1 = &xprt_min_resvport_limit, 109 .extra2 = &xprt_max_resvport_limit 110 }, 111 { 112 .ctl_name = CTL_MAX_RESVPORT, 113 .procname = "max_resvport", 114 .data = &xprt_max_resvport, 115 .maxlen = sizeof(unsigned int), 116 .mode = 0644, 117 .proc_handler = &proc_dointvec_minmax, 118 .strategy = &sysctl_intvec, 119 .extra1 = &xprt_min_resvport_limit, 120 .extra2 = &xprt_max_resvport_limit 121 }, 122 { 123 .procname = "tcp_fin_timeout", 124 .data = &xs_tcp_fin_timeout, 125 .maxlen = sizeof(xs_tcp_fin_timeout), 126 .mode = 0644, 127 .proc_handler = &proc_dointvec_jiffies, 128 .strategy = sysctl_jiffies 129 }, 130 { 131 .ctl_name = 0, 132 }, 133 }; 134 135 static ctl_table sunrpc_table[] = { 136 { 137 .ctl_name = CTL_SUNRPC, 138 .procname = "sunrpc", 139 .mode = 0555, 140 .child = xs_tunables_table 141 }, 142 { 143 .ctl_name = 0, 144 }, 145 }; 146 147 #endif 148 149 /* 150 * Time out for an RPC UDP socket connect. UDP socket connects are 151 * synchronous, but we set a timeout anyway in case of resource 152 * exhaustion on the local host. 153 */ 154 #define XS_UDP_CONN_TO (5U * HZ) 155 156 /* 157 * Wait duration for an RPC TCP connection to be established. Solaris 158 * NFS over TCP uses 60 seconds, for example, which is in line with how 159 * long a server takes to reboot. 160 */ 161 #define XS_TCP_CONN_TO (60U * HZ) 162 163 /* 164 * Wait duration for a reply from the RPC portmapper. 165 */ 166 #define XS_BIND_TO (60U * HZ) 167 168 /* 169 * Delay if a UDP socket connect error occurs. This is most likely some 170 * kind of resource problem on the local host. 171 */ 172 #define XS_UDP_REEST_TO (2U * HZ) 173 174 /* 175 * The reestablish timeout allows clients to delay for a bit before attempting 176 * to reconnect to a server that just dropped our connection. 177 * 178 * We implement an exponential backoff when trying to reestablish a TCP 179 * transport connection with the server. Some servers like to drop a TCP 180 * connection when they are overworked, so we start with a short timeout and 181 * increase over time if the server is down or not responding. 182 */ 183 #define XS_TCP_INIT_REEST_TO (3U * HZ) 184 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 185 186 /* 187 * TCP idle timeout; client drops the transport socket if it is idle 188 * for this long. Note that we also timeout UDP sockets to prevent 189 * holding port numbers when there is no RPC traffic. 190 */ 191 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 192 193 #ifdef RPC_DEBUG 194 # undef RPC_DEBUG_DATA 195 # define RPCDBG_FACILITY RPCDBG_TRANS 196 #endif 197 198 #ifdef RPC_DEBUG_DATA 199 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 200 { 201 u8 *buf = (u8 *) packet; 202 int j; 203 204 dprintk("RPC: %s\n", msg); 205 for (j = 0; j < count && j < 128; j += 4) { 206 if (!(j & 31)) { 207 if (j) 208 dprintk("\n"); 209 dprintk("0x%04x ", j); 210 } 211 dprintk("%02x%02x%02x%02x ", 212 buf[j], buf[j+1], buf[j+2], buf[j+3]); 213 } 214 dprintk("\n"); 215 } 216 #else 217 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 218 { 219 /* NOP */ 220 } 221 #endif 222 223 struct sock_xprt { 224 struct rpc_xprt xprt; 225 226 /* 227 * Network layer 228 */ 229 struct socket * sock; 230 struct sock * inet; 231 232 /* 233 * State of TCP reply receive 234 */ 235 __be32 tcp_fraghdr, 236 tcp_xid; 237 238 u32 tcp_offset, 239 tcp_reclen; 240 241 unsigned long tcp_copied, 242 tcp_flags; 243 244 /* 245 * Connection of transports 246 */ 247 struct delayed_work connect_worker; 248 struct sockaddr_storage addr; 249 unsigned short port; 250 251 /* 252 * UDP socket buffer size parameters 253 */ 254 size_t rcvsize, 255 sndsize; 256 257 /* 258 * Saved socket callback addresses 259 */ 260 void (*old_data_ready)(struct sock *, int); 261 void (*old_state_change)(struct sock *); 262 void (*old_write_space)(struct sock *); 263 void (*old_error_report)(struct sock *); 264 }; 265 266 /* 267 * TCP receive state flags 268 */ 269 #define TCP_RCV_LAST_FRAG (1UL << 0) 270 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 271 #define TCP_RCV_COPY_XID (1UL << 2) 272 #define TCP_RCV_COPY_DATA (1UL << 3) 273 274 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 275 { 276 return (struct sockaddr *) &xprt->addr; 277 } 278 279 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 280 { 281 return (struct sockaddr_in *) &xprt->addr; 282 } 283 284 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 285 { 286 return (struct sockaddr_in6 *) &xprt->addr; 287 } 288 289 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt, 290 const char *protocol, 291 const char *netid) 292 { 293 struct sockaddr_in *addr = xs_addr_in(xprt); 294 char *buf; 295 296 buf = kzalloc(20, GFP_KERNEL); 297 if (buf) { 298 snprintf(buf, 20, "%pI4", &addr->sin_addr.s_addr); 299 } 300 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 301 302 buf = kzalloc(8, GFP_KERNEL); 303 if (buf) { 304 snprintf(buf, 8, "%u", 305 ntohs(addr->sin_port)); 306 } 307 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 308 309 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 310 311 buf = kzalloc(48, GFP_KERNEL); 312 if (buf) { 313 snprintf(buf, 48, "addr=%pI4 port=%u proto=%s", 314 &addr->sin_addr.s_addr, 315 ntohs(addr->sin_port), 316 protocol); 317 } 318 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 319 320 buf = kzalloc(10, GFP_KERNEL); 321 if (buf) { 322 snprintf(buf, 10, "%02x%02x%02x%02x", 323 NIPQUAD(addr->sin_addr.s_addr)); 324 } 325 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 326 327 buf = kzalloc(8, GFP_KERNEL); 328 if (buf) { 329 snprintf(buf, 8, "%4hx", 330 ntohs(addr->sin_port)); 331 } 332 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 333 334 buf = kzalloc(30, GFP_KERNEL); 335 if (buf) { 336 snprintf(buf, 30, "%pI4.%u.%u", 337 &addr->sin_addr.s_addr, 338 ntohs(addr->sin_port) >> 8, 339 ntohs(addr->sin_port) & 0xff); 340 } 341 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 342 343 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 344 } 345 346 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt, 347 const char *protocol, 348 const char *netid) 349 { 350 struct sockaddr_in6 *addr = xs_addr_in6(xprt); 351 char *buf; 352 353 buf = kzalloc(40, GFP_KERNEL); 354 if (buf) { 355 snprintf(buf, 40, "%pI6",&addr->sin6_addr); 356 } 357 xprt->address_strings[RPC_DISPLAY_ADDR] = buf; 358 359 buf = kzalloc(8, GFP_KERNEL); 360 if (buf) { 361 snprintf(buf, 8, "%u", 362 ntohs(addr->sin6_port)); 363 } 364 xprt->address_strings[RPC_DISPLAY_PORT] = buf; 365 366 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 367 368 buf = kzalloc(64, GFP_KERNEL); 369 if (buf) { 370 snprintf(buf, 64, "addr=%pI6 port=%u proto=%s", 371 &addr->sin6_addr, 372 ntohs(addr->sin6_port), 373 protocol); 374 } 375 xprt->address_strings[RPC_DISPLAY_ALL] = buf; 376 377 buf = kzalloc(36, GFP_KERNEL); 378 if (buf) 379 snprintf(buf, 36, "%pi6", &addr->sin6_addr); 380 381 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; 382 383 buf = kzalloc(8, GFP_KERNEL); 384 if (buf) { 385 snprintf(buf, 8, "%4hx", 386 ntohs(addr->sin6_port)); 387 } 388 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; 389 390 buf = kzalloc(50, GFP_KERNEL); 391 if (buf) { 392 snprintf(buf, 50, "%pI6.%u.%u", 393 &addr->sin6_addr, 394 ntohs(addr->sin6_port) >> 8, 395 ntohs(addr->sin6_port) & 0xff); 396 } 397 xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; 398 399 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 400 } 401 402 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 403 { 404 unsigned int i; 405 406 for (i = 0; i < RPC_DISPLAY_MAX; i++) 407 switch (i) { 408 case RPC_DISPLAY_PROTO: 409 case RPC_DISPLAY_NETID: 410 continue; 411 default: 412 kfree(xprt->address_strings[i]); 413 } 414 } 415 416 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 417 418 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 419 { 420 struct msghdr msg = { 421 .msg_name = addr, 422 .msg_namelen = addrlen, 423 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 424 }; 425 struct kvec iov = { 426 .iov_base = vec->iov_base + base, 427 .iov_len = vec->iov_len - base, 428 }; 429 430 if (iov.iov_len != 0) 431 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 432 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 433 } 434 435 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 436 { 437 struct page **ppage; 438 unsigned int remainder; 439 int err, sent = 0; 440 441 remainder = xdr->page_len - base; 442 base += xdr->page_base; 443 ppage = xdr->pages + (base >> PAGE_SHIFT); 444 base &= ~PAGE_MASK; 445 for(;;) { 446 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 447 int flags = XS_SENDMSG_FLAGS; 448 449 remainder -= len; 450 if (remainder != 0 || more) 451 flags |= MSG_MORE; 452 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 453 if (remainder == 0 || err != len) 454 break; 455 sent += err; 456 ppage++; 457 base = 0; 458 } 459 if (sent == 0) 460 return err; 461 if (err > 0) 462 sent += err; 463 return sent; 464 } 465 466 /** 467 * xs_sendpages - write pages directly to a socket 468 * @sock: socket to send on 469 * @addr: UDP only -- address of destination 470 * @addrlen: UDP only -- length of destination address 471 * @xdr: buffer containing this request 472 * @base: starting position in the buffer 473 * 474 */ 475 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 476 { 477 unsigned int remainder = xdr->len - base; 478 int err, sent = 0; 479 480 if (unlikely(!sock)) 481 return -ENOTSOCK; 482 483 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 484 if (base != 0) { 485 addr = NULL; 486 addrlen = 0; 487 } 488 489 if (base < xdr->head[0].iov_len || addr != NULL) { 490 unsigned int len = xdr->head[0].iov_len - base; 491 remainder -= len; 492 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 493 if (remainder == 0 || err != len) 494 goto out; 495 sent += err; 496 base = 0; 497 } else 498 base -= xdr->head[0].iov_len; 499 500 if (base < xdr->page_len) { 501 unsigned int len = xdr->page_len - base; 502 remainder -= len; 503 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 504 if (remainder == 0 || err != len) 505 goto out; 506 sent += err; 507 base = 0; 508 } else 509 base -= xdr->page_len; 510 511 if (base >= xdr->tail[0].iov_len) 512 return sent; 513 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 514 out: 515 if (sent == 0) 516 return err; 517 if (err > 0) 518 sent += err; 519 return sent; 520 } 521 522 static void xs_nospace_callback(struct rpc_task *task) 523 { 524 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 525 526 transport->inet->sk_write_pending--; 527 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 528 } 529 530 /** 531 * xs_nospace - place task on wait queue if transmit was incomplete 532 * @task: task to put to sleep 533 * 534 */ 535 static int xs_nospace(struct rpc_task *task) 536 { 537 struct rpc_rqst *req = task->tk_rqstp; 538 struct rpc_xprt *xprt = req->rq_xprt; 539 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 540 int ret = 0; 541 542 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 543 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 544 req->rq_slen); 545 546 /* Protect against races with write_space */ 547 spin_lock_bh(&xprt->transport_lock); 548 549 /* Don't race with disconnect */ 550 if (xprt_connected(xprt)) { 551 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 552 ret = -EAGAIN; 553 /* 554 * Notify TCP that we're limited by the application 555 * window size 556 */ 557 set_bit(SOCK_NOSPACE, &transport->sock->flags); 558 transport->inet->sk_write_pending++; 559 /* ...and wait for more buffer space */ 560 xprt_wait_for_buffer_space(task, xs_nospace_callback); 561 } 562 } else { 563 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 564 ret = -ENOTCONN; 565 } 566 567 spin_unlock_bh(&xprt->transport_lock); 568 return ret; 569 } 570 571 /** 572 * xs_udp_send_request - write an RPC request to a UDP socket 573 * @task: address of RPC task that manages the state of an RPC request 574 * 575 * Return values: 576 * 0: The request has been sent 577 * EAGAIN: The socket was blocked, please call again later to 578 * complete the request 579 * ENOTCONN: Caller needs to invoke connect logic then call again 580 * other: Some other error occured, the request was not sent 581 */ 582 static int xs_udp_send_request(struct rpc_task *task) 583 { 584 struct rpc_rqst *req = task->tk_rqstp; 585 struct rpc_xprt *xprt = req->rq_xprt; 586 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 587 struct xdr_buf *xdr = &req->rq_snd_buf; 588 int status; 589 590 xs_pktdump("packet data:", 591 req->rq_svec->iov_base, 592 req->rq_svec->iov_len); 593 594 if (!xprt_bound(xprt)) 595 return -ENOTCONN; 596 status = xs_sendpages(transport->sock, 597 xs_addr(xprt), 598 xprt->addrlen, xdr, 599 req->rq_bytes_sent); 600 601 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 602 xdr->len - req->rq_bytes_sent, status); 603 604 if (status >= 0) { 605 task->tk_bytes_sent += status; 606 if (status >= req->rq_slen) 607 return 0; 608 /* Still some bytes left; set up for a retry later. */ 609 status = -EAGAIN; 610 } 611 if (!transport->sock) 612 goto out; 613 614 switch (status) { 615 case -ENOTSOCK: 616 status = -ENOTCONN; 617 /* Should we call xs_close() here? */ 618 break; 619 case -EAGAIN: 620 status = xs_nospace(task); 621 break; 622 default: 623 dprintk("RPC: sendmsg returned unrecognized error %d\n", 624 -status); 625 case -ENETUNREACH: 626 case -EPIPE: 627 case -ECONNREFUSED: 628 /* When the server has died, an ICMP port unreachable message 629 * prompts ECONNREFUSED. */ 630 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 631 } 632 out: 633 return status; 634 } 635 636 /** 637 * xs_tcp_shutdown - gracefully shut down a TCP socket 638 * @xprt: transport 639 * 640 * Initiates a graceful shutdown of the TCP socket by calling the 641 * equivalent of shutdown(SHUT_WR); 642 */ 643 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 644 { 645 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 646 struct socket *sock = transport->sock; 647 648 if (sock != NULL) 649 kernel_sock_shutdown(sock, SHUT_WR); 650 } 651 652 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 653 { 654 u32 reclen = buf->len - sizeof(rpc_fraghdr); 655 rpc_fraghdr *base = buf->head[0].iov_base; 656 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 657 } 658 659 /** 660 * xs_tcp_send_request - write an RPC request to a TCP socket 661 * @task: address of RPC task that manages the state of an RPC request 662 * 663 * Return values: 664 * 0: The request has been sent 665 * EAGAIN: The socket was blocked, please call again later to 666 * complete the request 667 * ENOTCONN: Caller needs to invoke connect logic then call again 668 * other: Some other error occured, the request was not sent 669 * 670 * XXX: In the case of soft timeouts, should we eventually give up 671 * if sendmsg is not able to make progress? 672 */ 673 static int xs_tcp_send_request(struct rpc_task *task) 674 { 675 struct rpc_rqst *req = task->tk_rqstp; 676 struct rpc_xprt *xprt = req->rq_xprt; 677 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 678 struct xdr_buf *xdr = &req->rq_snd_buf; 679 int status; 680 681 xs_encode_tcp_record_marker(&req->rq_snd_buf); 682 683 xs_pktdump("packet data:", 684 req->rq_svec->iov_base, 685 req->rq_svec->iov_len); 686 687 /* Continue transmitting the packet/record. We must be careful 688 * to cope with writespace callbacks arriving _after_ we have 689 * called sendmsg(). */ 690 while (1) { 691 status = xs_sendpages(transport->sock, 692 NULL, 0, xdr, req->rq_bytes_sent); 693 694 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 695 xdr->len - req->rq_bytes_sent, status); 696 697 if (unlikely(status < 0)) 698 break; 699 700 /* If we've sent the entire packet, immediately 701 * reset the count of bytes sent. */ 702 req->rq_bytes_sent += status; 703 task->tk_bytes_sent += status; 704 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 705 req->rq_bytes_sent = 0; 706 return 0; 707 } 708 709 if (status != 0) 710 continue; 711 status = -EAGAIN; 712 break; 713 } 714 if (!transport->sock) 715 goto out; 716 717 switch (status) { 718 case -ENOTSOCK: 719 status = -ENOTCONN; 720 /* Should we call xs_close() here? */ 721 break; 722 case -EAGAIN: 723 status = xs_nospace(task); 724 break; 725 default: 726 dprintk("RPC: sendmsg returned unrecognized error %d\n", 727 -status); 728 case -ECONNRESET: 729 case -EPIPE: 730 xs_tcp_shutdown(xprt); 731 case -ECONNREFUSED: 732 case -ENOTCONN: 733 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 734 } 735 out: 736 return status; 737 } 738 739 /** 740 * xs_tcp_release_xprt - clean up after a tcp transmission 741 * @xprt: transport 742 * @task: rpc task 743 * 744 * This cleans up if an error causes us to abort the transmission of a request. 745 * In this case, the socket may need to be reset in order to avoid confusing 746 * the server. 747 */ 748 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 749 { 750 struct rpc_rqst *req; 751 752 if (task != xprt->snd_task) 753 return; 754 if (task == NULL) 755 goto out_release; 756 req = task->tk_rqstp; 757 if (req->rq_bytes_sent == 0) 758 goto out_release; 759 if (req->rq_bytes_sent == req->rq_snd_buf.len) 760 goto out_release; 761 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 762 out_release: 763 xprt_release_xprt(xprt, task); 764 } 765 766 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 767 { 768 transport->old_data_ready = sk->sk_data_ready; 769 transport->old_state_change = sk->sk_state_change; 770 transport->old_write_space = sk->sk_write_space; 771 transport->old_error_report = sk->sk_error_report; 772 } 773 774 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 775 { 776 sk->sk_data_ready = transport->old_data_ready; 777 sk->sk_state_change = transport->old_state_change; 778 sk->sk_write_space = transport->old_write_space; 779 sk->sk_error_report = transport->old_error_report; 780 } 781 782 static void xs_reset_transport(struct sock_xprt *transport) 783 { 784 struct socket *sock = transport->sock; 785 struct sock *sk = transport->inet; 786 787 if (sk == NULL) 788 return; 789 790 write_lock_bh(&sk->sk_callback_lock); 791 transport->inet = NULL; 792 transport->sock = NULL; 793 794 sk->sk_user_data = NULL; 795 796 xs_restore_old_callbacks(transport, sk); 797 write_unlock_bh(&sk->sk_callback_lock); 798 799 sk->sk_no_check = 0; 800 801 sock_release(sock); 802 } 803 804 /** 805 * xs_close - close a socket 806 * @xprt: transport 807 * 808 * This is used when all requests are complete; ie, no DRC state remains 809 * on the server we want to save. 810 */ 811 static void xs_close(struct rpc_xprt *xprt) 812 { 813 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 814 815 dprintk("RPC: xs_close xprt %p\n", xprt); 816 817 xs_reset_transport(transport); 818 819 smp_mb__before_clear_bit(); 820 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 821 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 822 clear_bit(XPRT_CLOSING, &xprt->state); 823 smp_mb__after_clear_bit(); 824 xprt_disconnect_done(xprt); 825 } 826 827 /** 828 * xs_destroy - prepare to shutdown a transport 829 * @xprt: doomed transport 830 * 831 */ 832 static void xs_destroy(struct rpc_xprt *xprt) 833 { 834 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 835 836 dprintk("RPC: xs_destroy xprt %p\n", xprt); 837 838 cancel_rearming_delayed_work(&transport->connect_worker); 839 840 xs_close(xprt); 841 xs_free_peer_addresses(xprt); 842 kfree(xprt->slot); 843 kfree(xprt); 844 module_put(THIS_MODULE); 845 } 846 847 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 848 { 849 return (struct rpc_xprt *) sk->sk_user_data; 850 } 851 852 /** 853 * xs_udp_data_ready - "data ready" callback for UDP sockets 854 * @sk: socket with data to read 855 * @len: how much data to read 856 * 857 */ 858 static void xs_udp_data_ready(struct sock *sk, int len) 859 { 860 struct rpc_task *task; 861 struct rpc_xprt *xprt; 862 struct rpc_rqst *rovr; 863 struct sk_buff *skb; 864 int err, repsize, copied; 865 u32 _xid; 866 __be32 *xp; 867 868 read_lock(&sk->sk_callback_lock); 869 dprintk("RPC: xs_udp_data_ready...\n"); 870 if (!(xprt = xprt_from_sock(sk))) 871 goto out; 872 873 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 874 goto out; 875 876 if (xprt->shutdown) 877 goto dropit; 878 879 repsize = skb->len - sizeof(struct udphdr); 880 if (repsize < 4) { 881 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 882 goto dropit; 883 } 884 885 /* Copy the XID from the skb... */ 886 xp = skb_header_pointer(skb, sizeof(struct udphdr), 887 sizeof(_xid), &_xid); 888 if (xp == NULL) 889 goto dropit; 890 891 /* Look up and lock the request corresponding to the given XID */ 892 spin_lock(&xprt->transport_lock); 893 rovr = xprt_lookup_rqst(xprt, *xp); 894 if (!rovr) 895 goto out_unlock; 896 task = rovr->rq_task; 897 898 if ((copied = rovr->rq_private_buf.buflen) > repsize) 899 copied = repsize; 900 901 /* Suck it into the iovec, verify checksum if not done by hw. */ 902 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 903 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 904 goto out_unlock; 905 } 906 907 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 908 909 /* Something worked... */ 910 dst_confirm(skb->dst); 911 912 xprt_adjust_cwnd(task, copied); 913 xprt_update_rtt(task); 914 xprt_complete_rqst(task, copied); 915 916 out_unlock: 917 spin_unlock(&xprt->transport_lock); 918 dropit: 919 skb_free_datagram(sk, skb); 920 out: 921 read_unlock(&sk->sk_callback_lock); 922 } 923 924 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 925 { 926 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 927 size_t len, used; 928 char *p; 929 930 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 931 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 932 used = xdr_skb_read_bits(desc, p, len); 933 transport->tcp_offset += used; 934 if (used != len) 935 return; 936 937 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 938 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 939 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 940 else 941 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 942 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 943 944 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 945 transport->tcp_offset = 0; 946 947 /* Sanity check of the record length */ 948 if (unlikely(transport->tcp_reclen < 4)) { 949 dprintk("RPC: invalid TCP record fragment length\n"); 950 xprt_force_disconnect(xprt); 951 return; 952 } 953 dprintk("RPC: reading TCP record fragment of length %d\n", 954 transport->tcp_reclen); 955 } 956 957 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 958 { 959 if (transport->tcp_offset == transport->tcp_reclen) { 960 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 961 transport->tcp_offset = 0; 962 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 963 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 964 transport->tcp_flags |= TCP_RCV_COPY_XID; 965 transport->tcp_copied = 0; 966 } 967 } 968 } 969 970 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 971 { 972 size_t len, used; 973 char *p; 974 975 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 976 dprintk("RPC: reading XID (%Zu bytes)\n", len); 977 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 978 used = xdr_skb_read_bits(desc, p, len); 979 transport->tcp_offset += used; 980 if (used != len) 981 return; 982 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 983 transport->tcp_flags |= TCP_RCV_COPY_DATA; 984 transport->tcp_copied = 4; 985 dprintk("RPC: reading reply for XID %08x\n", 986 ntohl(transport->tcp_xid)); 987 xs_tcp_check_fraghdr(transport); 988 } 989 990 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 991 { 992 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 993 struct rpc_rqst *req; 994 struct xdr_buf *rcvbuf; 995 size_t len; 996 ssize_t r; 997 998 /* Find and lock the request corresponding to this xid */ 999 spin_lock(&xprt->transport_lock); 1000 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1001 if (!req) { 1002 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1003 dprintk("RPC: XID %08x request not found!\n", 1004 ntohl(transport->tcp_xid)); 1005 spin_unlock(&xprt->transport_lock); 1006 return; 1007 } 1008 1009 rcvbuf = &req->rq_private_buf; 1010 len = desc->count; 1011 if (len > transport->tcp_reclen - transport->tcp_offset) { 1012 struct xdr_skb_reader my_desc; 1013 1014 len = transport->tcp_reclen - transport->tcp_offset; 1015 memcpy(&my_desc, desc, sizeof(my_desc)); 1016 my_desc.count = len; 1017 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1018 &my_desc, xdr_skb_read_bits); 1019 desc->count -= r; 1020 desc->offset += r; 1021 } else 1022 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1023 desc, xdr_skb_read_bits); 1024 1025 if (r > 0) { 1026 transport->tcp_copied += r; 1027 transport->tcp_offset += r; 1028 } 1029 if (r != len) { 1030 /* Error when copying to the receive buffer, 1031 * usually because we weren't able to allocate 1032 * additional buffer pages. All we can do now 1033 * is turn off TCP_RCV_COPY_DATA, so the request 1034 * will not receive any additional updates, 1035 * and time out. 1036 * Any remaining data from this record will 1037 * be discarded. 1038 */ 1039 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1040 dprintk("RPC: XID %08x truncated request\n", 1041 ntohl(transport->tcp_xid)); 1042 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1043 "tcp_offset = %u, tcp_reclen = %u\n", 1044 xprt, transport->tcp_copied, 1045 transport->tcp_offset, transport->tcp_reclen); 1046 goto out; 1047 } 1048 1049 dprintk("RPC: XID %08x read %Zd bytes\n", 1050 ntohl(transport->tcp_xid), r); 1051 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1052 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1053 transport->tcp_offset, transport->tcp_reclen); 1054 1055 if (transport->tcp_copied == req->rq_private_buf.buflen) 1056 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1057 else if (transport->tcp_offset == transport->tcp_reclen) { 1058 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1059 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1060 } 1061 1062 out: 1063 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1064 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1065 spin_unlock(&xprt->transport_lock); 1066 xs_tcp_check_fraghdr(transport); 1067 } 1068 1069 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1070 { 1071 size_t len; 1072 1073 len = transport->tcp_reclen - transport->tcp_offset; 1074 if (len > desc->count) 1075 len = desc->count; 1076 desc->count -= len; 1077 desc->offset += len; 1078 transport->tcp_offset += len; 1079 dprintk("RPC: discarded %Zu bytes\n", len); 1080 xs_tcp_check_fraghdr(transport); 1081 } 1082 1083 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1084 { 1085 struct rpc_xprt *xprt = rd_desc->arg.data; 1086 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1087 struct xdr_skb_reader desc = { 1088 .skb = skb, 1089 .offset = offset, 1090 .count = len, 1091 }; 1092 1093 dprintk("RPC: xs_tcp_data_recv started\n"); 1094 do { 1095 /* Read in a new fragment marker if necessary */ 1096 /* Can we ever really expect to get completely empty fragments? */ 1097 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1098 xs_tcp_read_fraghdr(xprt, &desc); 1099 continue; 1100 } 1101 /* Read in the xid if necessary */ 1102 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1103 xs_tcp_read_xid(transport, &desc); 1104 continue; 1105 } 1106 /* Read in the request data */ 1107 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1108 xs_tcp_read_request(xprt, &desc); 1109 continue; 1110 } 1111 /* Skip over any trailing bytes on short reads */ 1112 xs_tcp_read_discard(transport, &desc); 1113 } while (desc.count); 1114 dprintk("RPC: xs_tcp_data_recv done\n"); 1115 return len - desc.count; 1116 } 1117 1118 /** 1119 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1120 * @sk: socket with data to read 1121 * @bytes: how much data to read 1122 * 1123 */ 1124 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1125 { 1126 struct rpc_xprt *xprt; 1127 read_descriptor_t rd_desc; 1128 int read; 1129 1130 dprintk("RPC: xs_tcp_data_ready...\n"); 1131 1132 read_lock(&sk->sk_callback_lock); 1133 if (!(xprt = xprt_from_sock(sk))) 1134 goto out; 1135 if (xprt->shutdown) 1136 goto out; 1137 1138 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1139 rd_desc.arg.data = xprt; 1140 do { 1141 rd_desc.count = 65536; 1142 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1143 } while (read > 0); 1144 out: 1145 read_unlock(&sk->sk_callback_lock); 1146 } 1147 1148 /* 1149 * Do the equivalent of linger/linger2 handling for dealing with 1150 * broken servers that don't close the socket in a timely 1151 * fashion 1152 */ 1153 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1154 unsigned long timeout) 1155 { 1156 struct sock_xprt *transport; 1157 1158 if (xprt_test_and_set_connecting(xprt)) 1159 return; 1160 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1161 transport = container_of(xprt, struct sock_xprt, xprt); 1162 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1163 timeout); 1164 } 1165 1166 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1167 { 1168 struct sock_xprt *transport; 1169 1170 transport = container_of(xprt, struct sock_xprt, xprt); 1171 1172 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1173 !cancel_delayed_work(&transport->connect_worker)) 1174 return; 1175 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1176 xprt_clear_connecting(xprt); 1177 } 1178 1179 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1180 { 1181 smp_mb__before_clear_bit(); 1182 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1183 clear_bit(XPRT_CLOSING, &xprt->state); 1184 smp_mb__after_clear_bit(); 1185 /* Mark transport as closed and wake up all pending tasks */ 1186 xprt_disconnect_done(xprt); 1187 } 1188 1189 /** 1190 * xs_tcp_state_change - callback to handle TCP socket state changes 1191 * @sk: socket whose state has changed 1192 * 1193 */ 1194 static void xs_tcp_state_change(struct sock *sk) 1195 { 1196 struct rpc_xprt *xprt; 1197 1198 read_lock(&sk->sk_callback_lock); 1199 if (!(xprt = xprt_from_sock(sk))) 1200 goto out; 1201 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1202 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1203 sk->sk_state, xprt_connected(xprt), 1204 sock_flag(sk, SOCK_DEAD), 1205 sock_flag(sk, SOCK_ZAPPED)); 1206 1207 switch (sk->sk_state) { 1208 case TCP_ESTABLISHED: 1209 spin_lock_bh(&xprt->transport_lock); 1210 if (!xprt_test_and_set_connected(xprt)) { 1211 struct sock_xprt *transport = container_of(xprt, 1212 struct sock_xprt, xprt); 1213 1214 /* Reset TCP record info */ 1215 transport->tcp_offset = 0; 1216 transport->tcp_reclen = 0; 1217 transport->tcp_copied = 0; 1218 transport->tcp_flags = 1219 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1220 1221 xprt_wake_pending_tasks(xprt, -EAGAIN); 1222 } 1223 spin_unlock_bh(&xprt->transport_lock); 1224 break; 1225 case TCP_FIN_WAIT1: 1226 /* The client initiated a shutdown of the socket */ 1227 xprt->connect_cookie++; 1228 xprt->reestablish_timeout = 0; 1229 set_bit(XPRT_CLOSING, &xprt->state); 1230 smp_mb__before_clear_bit(); 1231 clear_bit(XPRT_CONNECTED, &xprt->state); 1232 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1233 smp_mb__after_clear_bit(); 1234 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1235 break; 1236 case TCP_CLOSE_WAIT: 1237 /* The server initiated a shutdown of the socket */ 1238 xprt_force_disconnect(xprt); 1239 case TCP_SYN_SENT: 1240 xprt->connect_cookie++; 1241 case TCP_CLOSING: 1242 /* 1243 * If the server closed down the connection, make sure that 1244 * we back off before reconnecting 1245 */ 1246 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1247 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1248 break; 1249 case TCP_LAST_ACK: 1250 set_bit(XPRT_CLOSING, &xprt->state); 1251 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1252 smp_mb__before_clear_bit(); 1253 clear_bit(XPRT_CONNECTED, &xprt->state); 1254 smp_mb__after_clear_bit(); 1255 break; 1256 case TCP_CLOSE: 1257 xs_tcp_cancel_linger_timeout(xprt); 1258 xs_sock_mark_closed(xprt); 1259 } 1260 out: 1261 read_unlock(&sk->sk_callback_lock); 1262 } 1263 1264 /** 1265 * xs_error_report - callback mainly for catching socket errors 1266 * @sk: socket 1267 */ 1268 static void xs_error_report(struct sock *sk) 1269 { 1270 struct rpc_xprt *xprt; 1271 1272 read_lock(&sk->sk_callback_lock); 1273 if (!(xprt = xprt_from_sock(sk))) 1274 goto out; 1275 dprintk("RPC: %s client %p...\n" 1276 "RPC: error %d\n", 1277 __func__, xprt, sk->sk_err); 1278 xprt_wake_pending_tasks(xprt, -EAGAIN); 1279 out: 1280 read_unlock(&sk->sk_callback_lock); 1281 } 1282 1283 static void xs_write_space(struct sock *sk) 1284 { 1285 struct socket *sock; 1286 struct rpc_xprt *xprt; 1287 1288 if (unlikely(!(sock = sk->sk_socket))) 1289 return; 1290 clear_bit(SOCK_NOSPACE, &sock->flags); 1291 1292 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1293 return; 1294 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1295 return; 1296 1297 xprt_write_space(xprt); 1298 } 1299 1300 /** 1301 * xs_udp_write_space - callback invoked when socket buffer space 1302 * becomes available 1303 * @sk: socket whose state has changed 1304 * 1305 * Called when more output buffer space is available for this socket. 1306 * We try not to wake our writers until they can make "significant" 1307 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1308 * with a bunch of small requests. 1309 */ 1310 static void xs_udp_write_space(struct sock *sk) 1311 { 1312 read_lock(&sk->sk_callback_lock); 1313 1314 /* from net/core/sock.c:sock_def_write_space */ 1315 if (sock_writeable(sk)) 1316 xs_write_space(sk); 1317 1318 read_unlock(&sk->sk_callback_lock); 1319 } 1320 1321 /** 1322 * xs_tcp_write_space - callback invoked when socket buffer space 1323 * becomes available 1324 * @sk: socket whose state has changed 1325 * 1326 * Called when more output buffer space is available for this socket. 1327 * We try not to wake our writers until they can make "significant" 1328 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1329 * with a bunch of small requests. 1330 */ 1331 static void xs_tcp_write_space(struct sock *sk) 1332 { 1333 read_lock(&sk->sk_callback_lock); 1334 1335 /* from net/core/stream.c:sk_stream_write_space */ 1336 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1337 xs_write_space(sk); 1338 1339 read_unlock(&sk->sk_callback_lock); 1340 } 1341 1342 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1343 { 1344 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1345 struct sock *sk = transport->inet; 1346 1347 if (transport->rcvsize) { 1348 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1349 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1350 } 1351 if (transport->sndsize) { 1352 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1353 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1354 sk->sk_write_space(sk); 1355 } 1356 } 1357 1358 /** 1359 * xs_udp_set_buffer_size - set send and receive limits 1360 * @xprt: generic transport 1361 * @sndsize: requested size of send buffer, in bytes 1362 * @rcvsize: requested size of receive buffer, in bytes 1363 * 1364 * Set socket send and receive buffer size limits. 1365 */ 1366 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1367 { 1368 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1369 1370 transport->sndsize = 0; 1371 if (sndsize) 1372 transport->sndsize = sndsize + 1024; 1373 transport->rcvsize = 0; 1374 if (rcvsize) 1375 transport->rcvsize = rcvsize + 1024; 1376 1377 xs_udp_do_set_buffer_size(xprt); 1378 } 1379 1380 /** 1381 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1382 * @task: task that timed out 1383 * 1384 * Adjust the congestion window after a retransmit timeout has occurred. 1385 */ 1386 static void xs_udp_timer(struct rpc_task *task) 1387 { 1388 xprt_adjust_cwnd(task, -ETIMEDOUT); 1389 } 1390 1391 static unsigned short xs_get_random_port(void) 1392 { 1393 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1394 unsigned short rand = (unsigned short) net_random() % range; 1395 return rand + xprt_min_resvport; 1396 } 1397 1398 /** 1399 * xs_set_port - reset the port number in the remote endpoint address 1400 * @xprt: generic transport 1401 * @port: new port number 1402 * 1403 */ 1404 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1405 { 1406 struct sockaddr *addr = xs_addr(xprt); 1407 1408 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1409 1410 switch (addr->sa_family) { 1411 case AF_INET: 1412 ((struct sockaddr_in *)addr)->sin_port = htons(port); 1413 break; 1414 case AF_INET6: 1415 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); 1416 break; 1417 default: 1418 BUG(); 1419 } 1420 } 1421 1422 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1423 { 1424 unsigned short port = transport->port; 1425 1426 if (port == 0 && transport->xprt.resvport) 1427 port = xs_get_random_port(); 1428 return port; 1429 } 1430 1431 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1432 { 1433 if (transport->port != 0) 1434 transport->port = 0; 1435 if (!transport->xprt.resvport) 1436 return 0; 1437 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1438 return xprt_max_resvport; 1439 return --port; 1440 } 1441 1442 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1443 { 1444 struct sockaddr_in myaddr = { 1445 .sin_family = AF_INET, 1446 }; 1447 struct sockaddr_in *sa; 1448 int err, nloop = 0; 1449 unsigned short port = xs_get_srcport(transport, sock); 1450 unsigned short last; 1451 1452 sa = (struct sockaddr_in *)&transport->addr; 1453 myaddr.sin_addr = sa->sin_addr; 1454 do { 1455 myaddr.sin_port = htons(port); 1456 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1457 sizeof(myaddr)); 1458 if (port == 0) 1459 break; 1460 if (err == 0) { 1461 transport->port = port; 1462 break; 1463 } 1464 last = port; 1465 port = xs_next_srcport(transport, sock, port); 1466 if (port > last) 1467 nloop++; 1468 } while (err == -EADDRINUSE && nloop != 2); 1469 dprintk("RPC: %s %pI4:%u: %s (%d)\n", 1470 __func__, &myaddr.sin_addr, 1471 port, err ? "failed" : "ok", err); 1472 return err; 1473 } 1474 1475 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1476 { 1477 struct sockaddr_in6 myaddr = { 1478 .sin6_family = AF_INET6, 1479 }; 1480 struct sockaddr_in6 *sa; 1481 int err, nloop = 0; 1482 unsigned short port = xs_get_srcport(transport, sock); 1483 unsigned short last; 1484 1485 sa = (struct sockaddr_in6 *)&transport->addr; 1486 myaddr.sin6_addr = sa->sin6_addr; 1487 do { 1488 myaddr.sin6_port = htons(port); 1489 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1490 sizeof(myaddr)); 1491 if (port == 0) 1492 break; 1493 if (err == 0) { 1494 transport->port = port; 1495 break; 1496 } 1497 last = port; 1498 port = xs_next_srcport(transport, sock, port); 1499 if (port > last) 1500 nloop++; 1501 } while (err == -EADDRINUSE && nloop != 2); 1502 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", 1503 &myaddr.sin6_addr, port, err ? "failed" : "ok", err); 1504 return err; 1505 } 1506 1507 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1508 static struct lock_class_key xs_key[2]; 1509 static struct lock_class_key xs_slock_key[2]; 1510 1511 static inline void xs_reclassify_socket4(struct socket *sock) 1512 { 1513 struct sock *sk = sock->sk; 1514 1515 BUG_ON(sock_owned_by_user(sk)); 1516 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1517 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1518 } 1519 1520 static inline void xs_reclassify_socket6(struct socket *sock) 1521 { 1522 struct sock *sk = sock->sk; 1523 1524 BUG_ON(sock_owned_by_user(sk)); 1525 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1526 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1527 } 1528 #else 1529 static inline void xs_reclassify_socket4(struct socket *sock) 1530 { 1531 } 1532 1533 static inline void xs_reclassify_socket6(struct socket *sock) 1534 { 1535 } 1536 #endif 1537 1538 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1539 { 1540 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1541 1542 if (!transport->inet) { 1543 struct sock *sk = sock->sk; 1544 1545 write_lock_bh(&sk->sk_callback_lock); 1546 1547 xs_save_old_callbacks(transport, sk); 1548 1549 sk->sk_user_data = xprt; 1550 sk->sk_data_ready = xs_udp_data_ready; 1551 sk->sk_write_space = xs_udp_write_space; 1552 sk->sk_error_report = xs_error_report; 1553 sk->sk_no_check = UDP_CSUM_NORCV; 1554 sk->sk_allocation = GFP_ATOMIC; 1555 1556 xprt_set_connected(xprt); 1557 1558 /* Reset to new socket */ 1559 transport->sock = sock; 1560 transport->inet = sk; 1561 1562 write_unlock_bh(&sk->sk_callback_lock); 1563 } 1564 xs_udp_do_set_buffer_size(xprt); 1565 } 1566 1567 /** 1568 * xs_udp_connect_worker4 - set up a UDP socket 1569 * @work: RPC transport to connect 1570 * 1571 * Invoked by a work queue tasklet. 1572 */ 1573 static void xs_udp_connect_worker4(struct work_struct *work) 1574 { 1575 struct sock_xprt *transport = 1576 container_of(work, struct sock_xprt, connect_worker.work); 1577 struct rpc_xprt *xprt = &transport->xprt; 1578 struct socket *sock = transport->sock; 1579 int err, status = -EIO; 1580 1581 if (xprt->shutdown) 1582 goto out; 1583 1584 /* Start by resetting any existing state */ 1585 xs_reset_transport(transport); 1586 1587 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); 1588 if (err < 0) { 1589 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1590 goto out; 1591 } 1592 xs_reclassify_socket4(sock); 1593 1594 if (xs_bind4(transport, sock)) { 1595 sock_release(sock); 1596 goto out; 1597 } 1598 1599 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1600 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1601 1602 xs_udp_finish_connecting(xprt, sock); 1603 status = 0; 1604 out: 1605 xprt_clear_connecting(xprt); 1606 xprt_wake_pending_tasks(xprt, status); 1607 } 1608 1609 /** 1610 * xs_udp_connect_worker6 - set up a UDP socket 1611 * @work: RPC transport to connect 1612 * 1613 * Invoked by a work queue tasklet. 1614 */ 1615 static void xs_udp_connect_worker6(struct work_struct *work) 1616 { 1617 struct sock_xprt *transport = 1618 container_of(work, struct sock_xprt, connect_worker.work); 1619 struct rpc_xprt *xprt = &transport->xprt; 1620 struct socket *sock = transport->sock; 1621 int err, status = -EIO; 1622 1623 if (xprt->shutdown) 1624 goto out; 1625 1626 /* Start by resetting any existing state */ 1627 xs_reset_transport(transport); 1628 1629 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); 1630 if (err < 0) { 1631 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1632 goto out; 1633 } 1634 xs_reclassify_socket6(sock); 1635 1636 if (xs_bind6(transport, sock) < 0) { 1637 sock_release(sock); 1638 goto out; 1639 } 1640 1641 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1642 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1643 1644 xs_udp_finish_connecting(xprt, sock); 1645 status = 0; 1646 out: 1647 xprt_clear_connecting(xprt); 1648 xprt_wake_pending_tasks(xprt, status); 1649 } 1650 1651 /* 1652 * We need to preserve the port number so the reply cache on the server can 1653 * find our cached RPC replies when we get around to reconnecting. 1654 */ 1655 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) 1656 { 1657 int result; 1658 struct sockaddr any; 1659 1660 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1661 1662 /* 1663 * Disconnect the transport socket by doing a connect operation 1664 * with AF_UNSPEC. This should return immediately... 1665 */ 1666 memset(&any, 0, sizeof(any)); 1667 any.sa_family = AF_UNSPEC; 1668 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1669 if (!result) 1670 xs_sock_mark_closed(xprt); 1671 else 1672 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1673 result); 1674 } 1675 1676 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) 1677 { 1678 unsigned int state = transport->inet->sk_state; 1679 1680 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) 1681 return; 1682 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) 1683 return; 1684 xs_abort_connection(xprt, transport); 1685 } 1686 1687 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1688 { 1689 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1690 1691 if (!transport->inet) { 1692 struct sock *sk = sock->sk; 1693 1694 write_lock_bh(&sk->sk_callback_lock); 1695 1696 xs_save_old_callbacks(transport, sk); 1697 1698 sk->sk_user_data = xprt; 1699 sk->sk_data_ready = xs_tcp_data_ready; 1700 sk->sk_state_change = xs_tcp_state_change; 1701 sk->sk_write_space = xs_tcp_write_space; 1702 sk->sk_error_report = xs_error_report; 1703 sk->sk_allocation = GFP_ATOMIC; 1704 1705 /* socket options */ 1706 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1707 sock_reset_flag(sk, SOCK_LINGER); 1708 tcp_sk(sk)->linger2 = 0; 1709 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1710 1711 xprt_clear_connected(xprt); 1712 1713 /* Reset to new socket */ 1714 transport->sock = sock; 1715 transport->inet = sk; 1716 1717 write_unlock_bh(&sk->sk_callback_lock); 1718 } 1719 1720 if (!xprt_bound(xprt)) 1721 return -ENOTCONN; 1722 1723 /* Tell the socket layer to start connecting... */ 1724 xprt->stat.connect_count++; 1725 xprt->stat.connect_start = jiffies; 1726 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1727 } 1728 1729 /** 1730 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 1731 * @xprt: RPC transport to connect 1732 * @transport: socket transport to connect 1733 * @create_sock: function to create a socket of the correct type 1734 * 1735 * Invoked by a work queue tasklet. 1736 */ 1737 static void xs_tcp_setup_socket(struct rpc_xprt *xprt, 1738 struct sock_xprt *transport, 1739 struct socket *(*create_sock)(struct rpc_xprt *, 1740 struct sock_xprt *)) 1741 { 1742 struct socket *sock = transport->sock; 1743 int status = -EIO; 1744 1745 if (xprt->shutdown) 1746 goto out; 1747 1748 if (!sock) { 1749 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1750 sock = create_sock(xprt, transport); 1751 if (IS_ERR(sock)) { 1752 status = PTR_ERR(sock); 1753 goto out; 1754 } 1755 } else { 1756 int abort_and_exit; 1757 1758 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 1759 &xprt->state); 1760 /* "close" the socket, preserving the local port */ 1761 xs_tcp_reuse_connection(xprt, transport); 1762 1763 if (abort_and_exit) 1764 goto out_eagain; 1765 } 1766 1767 dprintk("RPC: worker connecting xprt %p to address: %s\n", 1768 xprt, xprt->address_strings[RPC_DISPLAY_ALL]); 1769 1770 status = xs_tcp_finish_connecting(xprt, sock); 1771 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1772 xprt, -status, xprt_connected(xprt), 1773 sock->sk->sk_state); 1774 switch (status) { 1775 case -ECONNREFUSED: 1776 case -ECONNRESET: 1777 case -ENETUNREACH: 1778 /* retry with existing socket, after a delay */ 1779 case 0: 1780 case -EINPROGRESS: 1781 case -EALREADY: 1782 xprt_clear_connecting(xprt); 1783 return; 1784 } 1785 /* get rid of existing socket, and retry */ 1786 xs_tcp_shutdown(xprt); 1787 printk("%s: connect returned unhandled error %d\n", 1788 __func__, status); 1789 out_eagain: 1790 status = -EAGAIN; 1791 out: 1792 xprt_clear_connecting(xprt); 1793 xprt_wake_pending_tasks(xprt, status); 1794 } 1795 1796 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, 1797 struct sock_xprt *transport) 1798 { 1799 struct socket *sock; 1800 int err; 1801 1802 /* start from scratch */ 1803 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); 1804 if (err < 0) { 1805 dprintk("RPC: can't create TCP transport socket (%d).\n", 1806 -err); 1807 goto out_err; 1808 } 1809 xs_reclassify_socket4(sock); 1810 1811 if (xs_bind4(transport, sock) < 0) { 1812 sock_release(sock); 1813 goto out_err; 1814 } 1815 return sock; 1816 out_err: 1817 return ERR_PTR(-EIO); 1818 } 1819 1820 /** 1821 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1822 * @work: RPC transport to connect 1823 * 1824 * Invoked by a work queue tasklet. 1825 */ 1826 static void xs_tcp_connect_worker4(struct work_struct *work) 1827 { 1828 struct sock_xprt *transport = 1829 container_of(work, struct sock_xprt, connect_worker.work); 1830 struct rpc_xprt *xprt = &transport->xprt; 1831 1832 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); 1833 } 1834 1835 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, 1836 struct sock_xprt *transport) 1837 { 1838 struct socket *sock; 1839 int err; 1840 1841 /* start from scratch */ 1842 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); 1843 if (err < 0) { 1844 dprintk("RPC: can't create TCP transport socket (%d).\n", 1845 -err); 1846 goto out_err; 1847 } 1848 xs_reclassify_socket6(sock); 1849 1850 if (xs_bind6(transport, sock) < 0) { 1851 sock_release(sock); 1852 goto out_err; 1853 } 1854 return sock; 1855 out_err: 1856 return ERR_PTR(-EIO); 1857 } 1858 1859 /** 1860 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1861 * @work: RPC transport to connect 1862 * 1863 * Invoked by a work queue tasklet. 1864 */ 1865 static void xs_tcp_connect_worker6(struct work_struct *work) 1866 { 1867 struct sock_xprt *transport = 1868 container_of(work, struct sock_xprt, connect_worker.work); 1869 struct rpc_xprt *xprt = &transport->xprt; 1870 1871 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); 1872 } 1873 1874 /** 1875 * xs_connect - connect a socket to a remote endpoint 1876 * @task: address of RPC task that manages state of connect request 1877 * 1878 * TCP: If the remote end dropped the connection, delay reconnecting. 1879 * 1880 * UDP socket connects are synchronous, but we use a work queue anyway 1881 * to guarantee that even unprivileged user processes can set up a 1882 * socket on a privileged port. 1883 * 1884 * If a UDP socket connect fails, the delay behavior here prevents 1885 * retry floods (hard mounts). 1886 */ 1887 static void xs_connect(struct rpc_task *task) 1888 { 1889 struct rpc_xprt *xprt = task->tk_xprt; 1890 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1891 1892 if (xprt_test_and_set_connecting(xprt)) 1893 return; 1894 1895 if (transport->sock != NULL) { 1896 dprintk("RPC: xs_connect delayed xprt %p for %lu " 1897 "seconds\n", 1898 xprt, xprt->reestablish_timeout / HZ); 1899 queue_delayed_work(rpciod_workqueue, 1900 &transport->connect_worker, 1901 xprt->reestablish_timeout); 1902 xprt->reestablish_timeout <<= 1; 1903 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1904 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1905 } else { 1906 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1907 queue_delayed_work(rpciod_workqueue, 1908 &transport->connect_worker, 0); 1909 } 1910 } 1911 1912 static void xs_tcp_connect(struct rpc_task *task) 1913 { 1914 struct rpc_xprt *xprt = task->tk_xprt; 1915 1916 /* Exit if we need to wait for socket shutdown to complete */ 1917 if (test_bit(XPRT_CLOSING, &xprt->state)) 1918 return; 1919 xs_connect(task); 1920 } 1921 1922 /** 1923 * xs_udp_print_stats - display UDP socket-specifc stats 1924 * @xprt: rpc_xprt struct containing statistics 1925 * @seq: output file 1926 * 1927 */ 1928 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1929 { 1930 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1931 1932 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1933 transport->port, 1934 xprt->stat.bind_count, 1935 xprt->stat.sends, 1936 xprt->stat.recvs, 1937 xprt->stat.bad_xids, 1938 xprt->stat.req_u, 1939 xprt->stat.bklog_u); 1940 } 1941 1942 /** 1943 * xs_tcp_print_stats - display TCP socket-specifc stats 1944 * @xprt: rpc_xprt struct containing statistics 1945 * @seq: output file 1946 * 1947 */ 1948 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1949 { 1950 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1951 long idle_time = 0; 1952 1953 if (xprt_connected(xprt)) 1954 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1955 1956 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1957 transport->port, 1958 xprt->stat.bind_count, 1959 xprt->stat.connect_count, 1960 xprt->stat.connect_time, 1961 idle_time, 1962 xprt->stat.sends, 1963 xprt->stat.recvs, 1964 xprt->stat.bad_xids, 1965 xprt->stat.req_u, 1966 xprt->stat.bklog_u); 1967 } 1968 1969 static struct rpc_xprt_ops xs_udp_ops = { 1970 .set_buffer_size = xs_udp_set_buffer_size, 1971 .reserve_xprt = xprt_reserve_xprt_cong, 1972 .release_xprt = xprt_release_xprt_cong, 1973 .rpcbind = rpcb_getport_async, 1974 .set_port = xs_set_port, 1975 .connect = xs_connect, 1976 .buf_alloc = rpc_malloc, 1977 .buf_free = rpc_free, 1978 .send_request = xs_udp_send_request, 1979 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1980 .timer = xs_udp_timer, 1981 .release_request = xprt_release_rqst_cong, 1982 .close = xs_close, 1983 .destroy = xs_destroy, 1984 .print_stats = xs_udp_print_stats, 1985 }; 1986 1987 static struct rpc_xprt_ops xs_tcp_ops = { 1988 .reserve_xprt = xprt_reserve_xprt, 1989 .release_xprt = xs_tcp_release_xprt, 1990 .rpcbind = rpcb_getport_async, 1991 .set_port = xs_set_port, 1992 .connect = xs_tcp_connect, 1993 .buf_alloc = rpc_malloc, 1994 .buf_free = rpc_free, 1995 .send_request = xs_tcp_send_request, 1996 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1997 .close = xs_tcp_shutdown, 1998 .destroy = xs_destroy, 1999 .print_stats = xs_tcp_print_stats, 2000 }; 2001 2002 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2003 unsigned int slot_table_size) 2004 { 2005 struct rpc_xprt *xprt; 2006 struct sock_xprt *new; 2007 2008 if (args->addrlen > sizeof(xprt->addr)) { 2009 dprintk("RPC: xs_setup_xprt: address too large\n"); 2010 return ERR_PTR(-EBADF); 2011 } 2012 2013 new = kzalloc(sizeof(*new), GFP_KERNEL); 2014 if (new == NULL) { 2015 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2016 "rpc_xprt\n"); 2017 return ERR_PTR(-ENOMEM); 2018 } 2019 xprt = &new->xprt; 2020 2021 xprt->max_reqs = slot_table_size; 2022 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 2023 if (xprt->slot == NULL) { 2024 kfree(xprt); 2025 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 2026 "table\n"); 2027 return ERR_PTR(-ENOMEM); 2028 } 2029 2030 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2031 xprt->addrlen = args->addrlen; 2032 if (args->srcaddr) 2033 memcpy(&new->addr, args->srcaddr, args->addrlen); 2034 2035 return xprt; 2036 } 2037 2038 static const struct rpc_timeout xs_udp_default_timeout = { 2039 .to_initval = 5 * HZ, 2040 .to_maxval = 30 * HZ, 2041 .to_increment = 5 * HZ, 2042 .to_retries = 5, 2043 }; 2044 2045 /** 2046 * xs_setup_udp - Set up transport to use a UDP socket 2047 * @args: rpc transport creation arguments 2048 * 2049 */ 2050 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2051 { 2052 struct sockaddr *addr = args->dstaddr; 2053 struct rpc_xprt *xprt; 2054 struct sock_xprt *transport; 2055 2056 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 2057 if (IS_ERR(xprt)) 2058 return xprt; 2059 transport = container_of(xprt, struct sock_xprt, xprt); 2060 2061 xprt->prot = IPPROTO_UDP; 2062 xprt->tsh_size = 0; 2063 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2064 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2065 2066 xprt->bind_timeout = XS_BIND_TO; 2067 xprt->connect_timeout = XS_UDP_CONN_TO; 2068 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2069 xprt->idle_timeout = XS_IDLE_DISC_TO; 2070 2071 xprt->ops = &xs_udp_ops; 2072 2073 xprt->timeout = &xs_udp_default_timeout; 2074 2075 switch (addr->sa_family) { 2076 case AF_INET: 2077 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2078 xprt_set_bound(xprt); 2079 2080 INIT_DELAYED_WORK(&transport->connect_worker, 2081 xs_udp_connect_worker4); 2082 xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2083 break; 2084 case AF_INET6: 2085 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2086 xprt_set_bound(xprt); 2087 2088 INIT_DELAYED_WORK(&transport->connect_worker, 2089 xs_udp_connect_worker6); 2090 xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2091 break; 2092 default: 2093 kfree(xprt); 2094 return ERR_PTR(-EAFNOSUPPORT); 2095 } 2096 2097 dprintk("RPC: set up transport to address %s\n", 2098 xprt->address_strings[RPC_DISPLAY_ALL]); 2099 2100 if (try_module_get(THIS_MODULE)) 2101 return xprt; 2102 2103 kfree(xprt->slot); 2104 kfree(xprt); 2105 return ERR_PTR(-EINVAL); 2106 } 2107 2108 static const struct rpc_timeout xs_tcp_default_timeout = { 2109 .to_initval = 60 * HZ, 2110 .to_maxval = 60 * HZ, 2111 .to_retries = 2, 2112 }; 2113 2114 /** 2115 * xs_setup_tcp - Set up transport to use a TCP socket 2116 * @args: rpc transport creation arguments 2117 * 2118 */ 2119 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2120 { 2121 struct sockaddr *addr = args->dstaddr; 2122 struct rpc_xprt *xprt; 2123 struct sock_xprt *transport; 2124 2125 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2126 if (IS_ERR(xprt)) 2127 return xprt; 2128 transport = container_of(xprt, struct sock_xprt, xprt); 2129 2130 xprt->prot = IPPROTO_TCP; 2131 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2132 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2133 2134 xprt->bind_timeout = XS_BIND_TO; 2135 xprt->connect_timeout = XS_TCP_CONN_TO; 2136 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2137 xprt->idle_timeout = XS_IDLE_DISC_TO; 2138 2139 xprt->ops = &xs_tcp_ops; 2140 xprt->timeout = &xs_tcp_default_timeout; 2141 2142 switch (addr->sa_family) { 2143 case AF_INET: 2144 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2145 xprt_set_bound(xprt); 2146 2147 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); 2148 xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2149 break; 2150 case AF_INET6: 2151 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2152 xprt_set_bound(xprt); 2153 2154 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); 2155 xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2156 break; 2157 default: 2158 kfree(xprt); 2159 return ERR_PTR(-EAFNOSUPPORT); 2160 } 2161 2162 dprintk("RPC: set up transport to address %s\n", 2163 xprt->address_strings[RPC_DISPLAY_ALL]); 2164 2165 if (try_module_get(THIS_MODULE)) 2166 return xprt; 2167 2168 kfree(xprt->slot); 2169 kfree(xprt); 2170 return ERR_PTR(-EINVAL); 2171 } 2172 2173 static struct xprt_class xs_udp_transport = { 2174 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2175 .name = "udp", 2176 .owner = THIS_MODULE, 2177 .ident = IPPROTO_UDP, 2178 .setup = xs_setup_udp, 2179 }; 2180 2181 static struct xprt_class xs_tcp_transport = { 2182 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2183 .name = "tcp", 2184 .owner = THIS_MODULE, 2185 .ident = IPPROTO_TCP, 2186 .setup = xs_setup_tcp, 2187 }; 2188 2189 /** 2190 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2191 * 2192 */ 2193 int init_socket_xprt(void) 2194 { 2195 #ifdef RPC_DEBUG 2196 if (!sunrpc_table_header) 2197 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2198 #endif 2199 2200 xprt_register_transport(&xs_udp_transport); 2201 xprt_register_transport(&xs_tcp_transport); 2202 2203 return 0; 2204 } 2205 2206 /** 2207 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2208 * 2209 */ 2210 void cleanup_socket_xprt(void) 2211 { 2212 #ifdef RPC_DEBUG 2213 if (sunrpc_table_header) { 2214 unregister_sysctl_table(sunrpc_table_header); 2215 sunrpc_table_header = NULL; 2216 } 2217 #endif 2218 2219 xprt_unregister_transport(&xs_udp_transport); 2220 xprt_unregister_transport(&xs_tcp_transport); 2221 } 2222