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/string.h> 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/capability.h> 26 #include <linux/pagemap.h> 27 #include <linux/errno.h> 28 #include <linux/socket.h> 29 #include <linux/in.h> 30 #include <linux/net.h> 31 #include <linux/mm.h> 32 #include <linux/un.h> 33 #include <linux/udp.h> 34 #include <linux/tcp.h> 35 #include <linux/sunrpc/clnt.h> 36 #include <linux/sunrpc/sched.h> 37 #include <linux/sunrpc/svcsock.h> 38 #include <linux/sunrpc/xprtsock.h> 39 #include <linux/file.h> 40 #ifdef CONFIG_SUNRPC_BACKCHANNEL 41 #include <linux/sunrpc/bc_xprt.h> 42 #endif 43 44 #include <net/sock.h> 45 #include <net/checksum.h> 46 #include <net/udp.h> 47 #include <net/tcp.h> 48 49 #include "sunrpc.h" 50 51 static void xs_close(struct rpc_xprt *xprt); 52 53 /* 54 * xprtsock tunables 55 */ 56 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 57 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 58 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 59 60 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 61 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 62 63 #define XS_TCP_LINGER_TO (15U * HZ) 64 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 65 66 /* 67 * We can register our own files under /proc/sys/sunrpc by 68 * calling register_sysctl_table() again. The files in that 69 * directory become the union of all files registered there. 70 * 71 * We simply need to make sure that we don't collide with 72 * someone else's file names! 73 */ 74 75 #ifdef RPC_DEBUG 76 77 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 78 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 79 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 80 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 81 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 82 83 static struct ctl_table_header *sunrpc_table_header; 84 85 /* 86 * FIXME: changing the UDP slot table size should also resize the UDP 87 * socket buffers for existing UDP transports 88 */ 89 static ctl_table xs_tunables_table[] = { 90 { 91 .procname = "udp_slot_table_entries", 92 .data = &xprt_udp_slot_table_entries, 93 .maxlen = sizeof(unsigned int), 94 .mode = 0644, 95 .proc_handler = proc_dointvec_minmax, 96 .extra1 = &min_slot_table_size, 97 .extra2 = &max_slot_table_size 98 }, 99 { 100 .procname = "tcp_slot_table_entries", 101 .data = &xprt_tcp_slot_table_entries, 102 .maxlen = sizeof(unsigned int), 103 .mode = 0644, 104 .proc_handler = proc_dointvec_minmax, 105 .extra1 = &min_slot_table_size, 106 .extra2 = &max_slot_table_size 107 }, 108 { 109 .procname = "tcp_max_slot_table_entries", 110 .data = &xprt_max_tcp_slot_table_entries, 111 .maxlen = sizeof(unsigned int), 112 .mode = 0644, 113 .proc_handler = proc_dointvec_minmax, 114 .extra1 = &min_slot_table_size, 115 .extra2 = &max_tcp_slot_table_limit 116 }, 117 { 118 .procname = "min_resvport", 119 .data = &xprt_min_resvport, 120 .maxlen = sizeof(unsigned int), 121 .mode = 0644, 122 .proc_handler = proc_dointvec_minmax, 123 .extra1 = &xprt_min_resvport_limit, 124 .extra2 = &xprt_max_resvport_limit 125 }, 126 { 127 .procname = "max_resvport", 128 .data = &xprt_max_resvport, 129 .maxlen = sizeof(unsigned int), 130 .mode = 0644, 131 .proc_handler = proc_dointvec_minmax, 132 .extra1 = &xprt_min_resvport_limit, 133 .extra2 = &xprt_max_resvport_limit 134 }, 135 { 136 .procname = "tcp_fin_timeout", 137 .data = &xs_tcp_fin_timeout, 138 .maxlen = sizeof(xs_tcp_fin_timeout), 139 .mode = 0644, 140 .proc_handler = proc_dointvec_jiffies, 141 }, 142 { }, 143 }; 144 145 static ctl_table sunrpc_table[] = { 146 { 147 .procname = "sunrpc", 148 .mode = 0555, 149 .child = xs_tunables_table 150 }, 151 { }, 152 }; 153 154 #endif 155 156 /* 157 * Wait duration for a reply from the RPC portmapper. 158 */ 159 #define XS_BIND_TO (60U * HZ) 160 161 /* 162 * Delay if a UDP socket connect error occurs. This is most likely some 163 * kind of resource problem on the local host. 164 */ 165 #define XS_UDP_REEST_TO (2U * HZ) 166 167 /* 168 * The reestablish timeout allows clients to delay for a bit before attempting 169 * to reconnect to a server that just dropped our connection. 170 * 171 * We implement an exponential backoff when trying to reestablish a TCP 172 * transport connection with the server. Some servers like to drop a TCP 173 * connection when they are overworked, so we start with a short timeout and 174 * increase over time if the server is down or not responding. 175 */ 176 #define XS_TCP_INIT_REEST_TO (3U * HZ) 177 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 178 179 /* 180 * TCP idle timeout; client drops the transport socket if it is idle 181 * for this long. Note that we also timeout UDP sockets to prevent 182 * holding port numbers when there is no RPC traffic. 183 */ 184 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 185 186 #ifdef RPC_DEBUG 187 # undef RPC_DEBUG_DATA 188 # define RPCDBG_FACILITY RPCDBG_TRANS 189 #endif 190 191 #ifdef RPC_DEBUG_DATA 192 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 193 { 194 u8 *buf = (u8 *) packet; 195 int j; 196 197 dprintk("RPC: %s\n", msg); 198 for (j = 0; j < count && j < 128; j += 4) { 199 if (!(j & 31)) { 200 if (j) 201 dprintk("\n"); 202 dprintk("0x%04x ", j); 203 } 204 dprintk("%02x%02x%02x%02x ", 205 buf[j], buf[j+1], buf[j+2], buf[j+3]); 206 } 207 dprintk("\n"); 208 } 209 #else 210 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 211 { 212 /* NOP */ 213 } 214 #endif 215 216 struct sock_xprt { 217 struct rpc_xprt xprt; 218 219 /* 220 * Network layer 221 */ 222 struct socket * sock; 223 struct sock * inet; 224 225 /* 226 * State of TCP reply receive 227 */ 228 __be32 tcp_fraghdr, 229 tcp_xid, 230 tcp_calldir; 231 232 u32 tcp_offset, 233 tcp_reclen; 234 235 unsigned long tcp_copied, 236 tcp_flags; 237 238 /* 239 * Connection of transports 240 */ 241 struct delayed_work connect_worker; 242 struct sockaddr_storage srcaddr; 243 unsigned short srcport; 244 245 /* 246 * UDP socket buffer size parameters 247 */ 248 size_t rcvsize, 249 sndsize; 250 251 /* 252 * Saved socket callback addresses 253 */ 254 void (*old_data_ready)(struct sock *, int); 255 void (*old_state_change)(struct sock *); 256 void (*old_write_space)(struct sock *); 257 void (*old_error_report)(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 #define TCP_RCV_READ_CALLDIR (1UL << 4) 268 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 269 270 /* 271 * TCP RPC flags 272 */ 273 #define TCP_RPC_REPLY (1UL << 6) 274 275 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 276 { 277 return (struct sockaddr *) &xprt->addr; 278 } 279 280 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 281 { 282 return (struct sockaddr_un *) &xprt->addr; 283 } 284 285 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 286 { 287 return (struct sockaddr_in *) &xprt->addr; 288 } 289 290 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 291 { 292 return (struct sockaddr_in6 *) &xprt->addr; 293 } 294 295 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 296 { 297 struct sockaddr *sap = xs_addr(xprt); 298 struct sockaddr_in6 *sin6; 299 struct sockaddr_in *sin; 300 struct sockaddr_un *sun; 301 char buf[128]; 302 303 switch (sap->sa_family) { 304 case AF_LOCAL: 305 sun = xs_addr_un(xprt); 306 strlcpy(buf, sun->sun_path, sizeof(buf)); 307 xprt->address_strings[RPC_DISPLAY_ADDR] = 308 kstrdup(buf, GFP_KERNEL); 309 break; 310 case AF_INET: 311 (void)rpc_ntop(sap, buf, sizeof(buf)); 312 xprt->address_strings[RPC_DISPLAY_ADDR] = 313 kstrdup(buf, GFP_KERNEL); 314 sin = xs_addr_in(xprt); 315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 316 break; 317 case AF_INET6: 318 (void)rpc_ntop(sap, buf, sizeof(buf)); 319 xprt->address_strings[RPC_DISPLAY_ADDR] = 320 kstrdup(buf, GFP_KERNEL); 321 sin6 = xs_addr_in6(xprt); 322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 323 break; 324 default: 325 BUG(); 326 } 327 328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 329 } 330 331 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 332 { 333 struct sockaddr *sap = xs_addr(xprt); 334 char buf[128]; 335 336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 338 339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 341 } 342 343 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 344 const char *protocol, 345 const char *netid) 346 { 347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 348 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 349 xs_format_common_peer_addresses(xprt); 350 xs_format_common_peer_ports(xprt); 351 } 352 353 static void xs_update_peer_port(struct rpc_xprt *xprt) 354 { 355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 357 358 xs_format_common_peer_ports(xprt); 359 } 360 361 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 362 { 363 unsigned int i; 364 365 for (i = 0; i < RPC_DISPLAY_MAX; i++) 366 switch (i) { 367 case RPC_DISPLAY_PROTO: 368 case RPC_DISPLAY_NETID: 369 continue; 370 default: 371 kfree(xprt->address_strings[i]); 372 } 373 } 374 375 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 376 377 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 378 { 379 struct msghdr msg = { 380 .msg_name = addr, 381 .msg_namelen = addrlen, 382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 383 }; 384 struct kvec iov = { 385 .iov_base = vec->iov_base + base, 386 .iov_len = vec->iov_len - base, 387 }; 388 389 if (iov.iov_len != 0) 390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 391 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 392 } 393 394 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 395 { 396 struct page **ppage; 397 unsigned int remainder; 398 int err, sent = 0; 399 400 remainder = xdr->page_len - base; 401 base += xdr->page_base; 402 ppage = xdr->pages + (base >> PAGE_SHIFT); 403 base &= ~PAGE_MASK; 404 for(;;) { 405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 406 int flags = XS_SENDMSG_FLAGS; 407 408 remainder -= len; 409 if (remainder != 0 || more) 410 flags |= MSG_MORE; 411 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 412 if (remainder == 0 || err != len) 413 break; 414 sent += err; 415 ppage++; 416 base = 0; 417 } 418 if (sent == 0) 419 return err; 420 if (err > 0) 421 sent += err; 422 return sent; 423 } 424 425 /** 426 * xs_sendpages - write pages directly to a socket 427 * @sock: socket to send on 428 * @addr: UDP only -- address of destination 429 * @addrlen: UDP only -- length of destination address 430 * @xdr: buffer containing this request 431 * @base: starting position in the buffer 432 * 433 */ 434 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 435 { 436 unsigned int remainder = xdr->len - base; 437 int err, sent = 0; 438 439 if (unlikely(!sock)) 440 return -ENOTSOCK; 441 442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 443 if (base != 0) { 444 addr = NULL; 445 addrlen = 0; 446 } 447 448 if (base < xdr->head[0].iov_len || addr != NULL) { 449 unsigned int len = xdr->head[0].iov_len - base; 450 remainder -= len; 451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 452 if (remainder == 0 || err != len) 453 goto out; 454 sent += err; 455 base = 0; 456 } else 457 base -= xdr->head[0].iov_len; 458 459 if (base < xdr->page_len) { 460 unsigned int len = xdr->page_len - base; 461 remainder -= len; 462 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 463 if (remainder == 0 || err != len) 464 goto out; 465 sent += err; 466 base = 0; 467 } else 468 base -= xdr->page_len; 469 470 if (base >= xdr->tail[0].iov_len) 471 return sent; 472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 473 out: 474 if (sent == 0) 475 return err; 476 if (err > 0) 477 sent += err; 478 return sent; 479 } 480 481 static void xs_nospace_callback(struct rpc_task *task) 482 { 483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 484 485 transport->inet->sk_write_pending--; 486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 487 } 488 489 /** 490 * xs_nospace - place task on wait queue if transmit was incomplete 491 * @task: task to put to sleep 492 * 493 */ 494 static int xs_nospace(struct rpc_task *task) 495 { 496 struct rpc_rqst *req = task->tk_rqstp; 497 struct rpc_xprt *xprt = req->rq_xprt; 498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 499 int ret = -EAGAIN; 500 501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 502 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 503 req->rq_slen); 504 505 /* Protect against races with write_space */ 506 spin_lock_bh(&xprt->transport_lock); 507 508 /* Don't race with disconnect */ 509 if (xprt_connected(xprt)) { 510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 511 /* 512 * Notify TCP that we're limited by the application 513 * window size 514 */ 515 set_bit(SOCK_NOSPACE, &transport->sock->flags); 516 transport->inet->sk_write_pending++; 517 /* ...and wait for more buffer space */ 518 xprt_wait_for_buffer_space(task, xs_nospace_callback); 519 } 520 } else { 521 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 522 ret = -ENOTCONN; 523 } 524 525 spin_unlock_bh(&xprt->transport_lock); 526 return ret; 527 } 528 529 /* 530 * Construct a stream transport record marker in @buf. 531 */ 532 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 533 { 534 u32 reclen = buf->len - sizeof(rpc_fraghdr); 535 rpc_fraghdr *base = buf->head[0].iov_base; 536 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 537 } 538 539 /** 540 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 541 * @task: RPC task that manages the state of an RPC request 542 * 543 * Return values: 544 * 0: The request has been sent 545 * EAGAIN: The socket was blocked, please call again later to 546 * complete the request 547 * ENOTCONN: Caller needs to invoke connect logic then call again 548 * other: Some other error occured, the request was not sent 549 */ 550 static int xs_local_send_request(struct rpc_task *task) 551 { 552 struct rpc_rqst *req = task->tk_rqstp; 553 struct rpc_xprt *xprt = req->rq_xprt; 554 struct sock_xprt *transport = 555 container_of(xprt, struct sock_xprt, xprt); 556 struct xdr_buf *xdr = &req->rq_snd_buf; 557 int status; 558 559 xs_encode_stream_record_marker(&req->rq_snd_buf); 560 561 xs_pktdump("packet data:", 562 req->rq_svec->iov_base, req->rq_svec->iov_len); 563 564 status = xs_sendpages(transport->sock, NULL, 0, 565 xdr, req->rq_bytes_sent); 566 dprintk("RPC: %s(%u) = %d\n", 567 __func__, xdr->len - req->rq_bytes_sent, status); 568 if (likely(status >= 0)) { 569 req->rq_bytes_sent += status; 570 req->rq_xmit_bytes_sent += status; 571 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 572 req->rq_bytes_sent = 0; 573 return 0; 574 } 575 status = -EAGAIN; 576 } 577 578 switch (status) { 579 case -EAGAIN: 580 status = xs_nospace(task); 581 break; 582 default: 583 dprintk("RPC: sendmsg returned unrecognized error %d\n", 584 -status); 585 case -EPIPE: 586 xs_close(xprt); 587 status = -ENOTCONN; 588 } 589 590 return status; 591 } 592 593 /** 594 * xs_udp_send_request - write an RPC request to a UDP socket 595 * @task: address of RPC task that manages the state of an RPC request 596 * 597 * Return values: 598 * 0: The request has been sent 599 * EAGAIN: The socket was blocked, please call again later to 600 * complete the request 601 * ENOTCONN: Caller needs to invoke connect logic then call again 602 * other: Some other error occurred, the request was not sent 603 */ 604 static int xs_udp_send_request(struct rpc_task *task) 605 { 606 struct rpc_rqst *req = task->tk_rqstp; 607 struct rpc_xprt *xprt = req->rq_xprt; 608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 609 struct xdr_buf *xdr = &req->rq_snd_buf; 610 int status; 611 612 xs_pktdump("packet data:", 613 req->rq_svec->iov_base, 614 req->rq_svec->iov_len); 615 616 if (!xprt_bound(xprt)) 617 return -ENOTCONN; 618 status = xs_sendpages(transport->sock, 619 xs_addr(xprt), 620 xprt->addrlen, xdr, 621 req->rq_bytes_sent); 622 623 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 624 xdr->len - req->rq_bytes_sent, status); 625 626 if (status >= 0) { 627 req->rq_xmit_bytes_sent += status; 628 if (status >= req->rq_slen) 629 return 0; 630 /* Still some bytes left; set up for a retry later. */ 631 status = -EAGAIN; 632 } 633 634 switch (status) { 635 case -ENOTSOCK: 636 status = -ENOTCONN; 637 /* Should we call xs_close() here? */ 638 break; 639 case -EAGAIN: 640 status = xs_nospace(task); 641 break; 642 default: 643 dprintk("RPC: sendmsg returned unrecognized error %d\n", 644 -status); 645 case -ENETUNREACH: 646 case -EPIPE: 647 case -ECONNREFUSED: 648 /* When the server has died, an ICMP port unreachable message 649 * prompts ECONNREFUSED. */ 650 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 651 } 652 653 return status; 654 } 655 656 /** 657 * xs_tcp_shutdown - gracefully shut down a TCP socket 658 * @xprt: transport 659 * 660 * Initiates a graceful shutdown of the TCP socket by calling the 661 * equivalent of shutdown(SHUT_WR); 662 */ 663 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 664 { 665 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 666 struct socket *sock = transport->sock; 667 668 if (sock != NULL) 669 kernel_sock_shutdown(sock, SHUT_WR); 670 } 671 672 /** 673 * xs_tcp_send_request - write an RPC request to a TCP socket 674 * @task: address of RPC task that manages the state of an RPC request 675 * 676 * Return values: 677 * 0: The request has been sent 678 * EAGAIN: The socket was blocked, please call again later to 679 * complete the request 680 * ENOTCONN: Caller needs to invoke connect logic then call again 681 * other: Some other error occurred, the request was not sent 682 * 683 * XXX: In the case of soft timeouts, should we eventually give up 684 * if sendmsg is not able to make progress? 685 */ 686 static int xs_tcp_send_request(struct rpc_task *task) 687 { 688 struct rpc_rqst *req = task->tk_rqstp; 689 struct rpc_xprt *xprt = req->rq_xprt; 690 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 691 struct xdr_buf *xdr = &req->rq_snd_buf; 692 int status; 693 694 xs_encode_stream_record_marker(&req->rq_snd_buf); 695 696 xs_pktdump("packet data:", 697 req->rq_svec->iov_base, 698 req->rq_svec->iov_len); 699 700 /* Continue transmitting the packet/record. We must be careful 701 * to cope with writespace callbacks arriving _after_ we have 702 * called sendmsg(). */ 703 while (1) { 704 status = xs_sendpages(transport->sock, 705 NULL, 0, xdr, req->rq_bytes_sent); 706 707 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 708 xdr->len - req->rq_bytes_sent, status); 709 710 if (unlikely(status < 0)) 711 break; 712 713 /* If we've sent the entire packet, immediately 714 * reset the count of bytes sent. */ 715 req->rq_bytes_sent += status; 716 req->rq_xmit_bytes_sent += status; 717 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 718 req->rq_bytes_sent = 0; 719 return 0; 720 } 721 722 if (status != 0) 723 continue; 724 status = -EAGAIN; 725 break; 726 } 727 728 switch (status) { 729 case -ENOTSOCK: 730 status = -ENOTCONN; 731 /* Should we call xs_close() here? */ 732 break; 733 case -EAGAIN: 734 status = xs_nospace(task); 735 break; 736 default: 737 dprintk("RPC: sendmsg returned unrecognized error %d\n", 738 -status); 739 case -ECONNRESET: 740 case -EPIPE: 741 xs_tcp_shutdown(xprt); 742 case -ECONNREFUSED: 743 case -ENOTCONN: 744 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 745 } 746 747 return status; 748 } 749 750 /** 751 * xs_tcp_release_xprt - clean up after a tcp transmission 752 * @xprt: transport 753 * @task: rpc task 754 * 755 * This cleans up if an error causes us to abort the transmission of a request. 756 * In this case, the socket may need to be reset in order to avoid confusing 757 * the server. 758 */ 759 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 760 { 761 struct rpc_rqst *req; 762 763 if (task != xprt->snd_task) 764 return; 765 if (task == NULL) 766 goto out_release; 767 req = task->tk_rqstp; 768 if (req == NULL) 769 goto out_release; 770 if (req->rq_bytes_sent == 0) 771 goto out_release; 772 if (req->rq_bytes_sent == req->rq_snd_buf.len) 773 goto out_release; 774 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 775 out_release: 776 xprt_release_xprt(xprt, task); 777 } 778 779 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 780 { 781 transport->old_data_ready = sk->sk_data_ready; 782 transport->old_state_change = sk->sk_state_change; 783 transport->old_write_space = sk->sk_write_space; 784 transport->old_error_report = sk->sk_error_report; 785 } 786 787 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 788 { 789 sk->sk_data_ready = transport->old_data_ready; 790 sk->sk_state_change = transport->old_state_change; 791 sk->sk_write_space = transport->old_write_space; 792 sk->sk_error_report = transport->old_error_report; 793 } 794 795 static void xs_reset_transport(struct sock_xprt *transport) 796 { 797 struct socket *sock = transport->sock; 798 struct sock *sk = transport->inet; 799 800 if (sk == NULL) 801 return; 802 803 transport->srcport = 0; 804 805 write_lock_bh(&sk->sk_callback_lock); 806 transport->inet = NULL; 807 transport->sock = NULL; 808 809 sk->sk_user_data = NULL; 810 811 xs_restore_old_callbacks(transport, sk); 812 write_unlock_bh(&sk->sk_callback_lock); 813 814 sk->sk_no_check = 0; 815 816 sock_release(sock); 817 } 818 819 /** 820 * xs_close - close a socket 821 * @xprt: transport 822 * 823 * This is used when all requests are complete; ie, no DRC state remains 824 * on the server we want to save. 825 * 826 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 827 * xs_reset_transport() zeroing the socket from underneath a writer. 828 */ 829 static void xs_close(struct rpc_xprt *xprt) 830 { 831 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 832 833 dprintk("RPC: xs_close xprt %p\n", xprt); 834 835 xs_reset_transport(transport); 836 xprt->reestablish_timeout = 0; 837 838 smp_mb__before_clear_bit(); 839 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 840 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 841 clear_bit(XPRT_CLOSING, &xprt->state); 842 smp_mb__after_clear_bit(); 843 xprt_disconnect_done(xprt); 844 } 845 846 static void xs_tcp_close(struct rpc_xprt *xprt) 847 { 848 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 849 xs_close(xprt); 850 else 851 xs_tcp_shutdown(xprt); 852 } 853 854 /** 855 * xs_destroy - prepare to shutdown a transport 856 * @xprt: doomed transport 857 * 858 */ 859 static void xs_destroy(struct rpc_xprt *xprt) 860 { 861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 862 863 dprintk("RPC: xs_destroy xprt %p\n", xprt); 864 865 cancel_delayed_work_sync(&transport->connect_worker); 866 867 xs_close(xprt); 868 xs_free_peer_addresses(xprt); 869 xprt_free(xprt); 870 module_put(THIS_MODULE); 871 } 872 873 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 874 { 875 return (struct rpc_xprt *) sk->sk_user_data; 876 } 877 878 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 879 { 880 struct xdr_skb_reader desc = { 881 .skb = skb, 882 .offset = sizeof(rpc_fraghdr), 883 .count = skb->len - sizeof(rpc_fraghdr), 884 }; 885 886 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 887 return -1; 888 if (desc.count) 889 return -1; 890 return 0; 891 } 892 893 /** 894 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 895 * @sk: socket with data to read 896 * @len: how much data to read 897 * 898 * Currently this assumes we can read the whole reply in a single gulp. 899 */ 900 static void xs_local_data_ready(struct sock *sk, int len) 901 { 902 struct rpc_task *task; 903 struct rpc_xprt *xprt; 904 struct rpc_rqst *rovr; 905 struct sk_buff *skb; 906 int err, repsize, copied; 907 u32 _xid; 908 __be32 *xp; 909 910 read_lock_bh(&sk->sk_callback_lock); 911 dprintk("RPC: %s...\n", __func__); 912 xprt = xprt_from_sock(sk); 913 if (xprt == NULL) 914 goto out; 915 916 skb = skb_recv_datagram(sk, 0, 1, &err); 917 if (skb == NULL) 918 goto out; 919 920 if (xprt->shutdown) 921 goto dropit; 922 923 repsize = skb->len - sizeof(rpc_fraghdr); 924 if (repsize < 4) { 925 dprintk("RPC: impossible RPC reply size %d\n", repsize); 926 goto dropit; 927 } 928 929 /* Copy the XID from the skb... */ 930 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 931 if (xp == NULL) 932 goto dropit; 933 934 /* Look up and lock the request corresponding to the given XID */ 935 spin_lock(&xprt->transport_lock); 936 rovr = xprt_lookup_rqst(xprt, *xp); 937 if (!rovr) 938 goto out_unlock; 939 task = rovr->rq_task; 940 941 copied = rovr->rq_private_buf.buflen; 942 if (copied > repsize) 943 copied = repsize; 944 945 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 946 dprintk("RPC: sk_buff copy failed\n"); 947 goto out_unlock; 948 } 949 950 xprt_complete_rqst(task, copied); 951 952 out_unlock: 953 spin_unlock(&xprt->transport_lock); 954 dropit: 955 skb_free_datagram(sk, skb); 956 out: 957 read_unlock_bh(&sk->sk_callback_lock); 958 } 959 960 /** 961 * xs_udp_data_ready - "data ready" callback for UDP sockets 962 * @sk: socket with data to read 963 * @len: how much data to read 964 * 965 */ 966 static void xs_udp_data_ready(struct sock *sk, int len) 967 { 968 struct rpc_task *task; 969 struct rpc_xprt *xprt; 970 struct rpc_rqst *rovr; 971 struct sk_buff *skb; 972 int err, repsize, copied; 973 u32 _xid; 974 __be32 *xp; 975 976 read_lock_bh(&sk->sk_callback_lock); 977 dprintk("RPC: xs_udp_data_ready...\n"); 978 if (!(xprt = xprt_from_sock(sk))) 979 goto out; 980 981 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 982 goto out; 983 984 if (xprt->shutdown) 985 goto dropit; 986 987 repsize = skb->len - sizeof(struct udphdr); 988 if (repsize < 4) { 989 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 990 goto dropit; 991 } 992 993 /* Copy the XID from the skb... */ 994 xp = skb_header_pointer(skb, sizeof(struct udphdr), 995 sizeof(_xid), &_xid); 996 if (xp == NULL) 997 goto dropit; 998 999 /* Look up and lock the request corresponding to the given XID */ 1000 spin_lock(&xprt->transport_lock); 1001 rovr = xprt_lookup_rqst(xprt, *xp); 1002 if (!rovr) 1003 goto out_unlock; 1004 task = rovr->rq_task; 1005 1006 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1007 copied = repsize; 1008 1009 /* Suck it into the iovec, verify checksum if not done by hw. */ 1010 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1011 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1012 goto out_unlock; 1013 } 1014 1015 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1016 1017 xprt_adjust_cwnd(task, copied); 1018 xprt_complete_rqst(task, copied); 1019 1020 out_unlock: 1021 spin_unlock(&xprt->transport_lock); 1022 dropit: 1023 skb_free_datagram(sk, skb); 1024 out: 1025 read_unlock_bh(&sk->sk_callback_lock); 1026 } 1027 1028 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1029 { 1030 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1031 size_t len, used; 1032 char *p; 1033 1034 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1035 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1036 used = xdr_skb_read_bits(desc, p, len); 1037 transport->tcp_offset += used; 1038 if (used != len) 1039 return; 1040 1041 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1042 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1043 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1044 else 1045 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1046 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1047 1048 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1049 transport->tcp_offset = 0; 1050 1051 /* Sanity check of the record length */ 1052 if (unlikely(transport->tcp_reclen < 8)) { 1053 dprintk("RPC: invalid TCP record fragment length\n"); 1054 xprt_force_disconnect(xprt); 1055 return; 1056 } 1057 dprintk("RPC: reading TCP record fragment of length %d\n", 1058 transport->tcp_reclen); 1059 } 1060 1061 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1062 { 1063 if (transport->tcp_offset == transport->tcp_reclen) { 1064 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1065 transport->tcp_offset = 0; 1066 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1067 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1068 transport->tcp_flags |= TCP_RCV_COPY_XID; 1069 transport->tcp_copied = 0; 1070 } 1071 } 1072 } 1073 1074 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1075 { 1076 size_t len, used; 1077 char *p; 1078 1079 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1080 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1081 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1082 used = xdr_skb_read_bits(desc, p, len); 1083 transport->tcp_offset += used; 1084 if (used != len) 1085 return; 1086 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1087 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1088 transport->tcp_copied = 4; 1089 dprintk("RPC: reading %s XID %08x\n", 1090 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1091 : "request with", 1092 ntohl(transport->tcp_xid)); 1093 xs_tcp_check_fraghdr(transport); 1094 } 1095 1096 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1097 struct xdr_skb_reader *desc) 1098 { 1099 size_t len, used; 1100 u32 offset; 1101 char *p; 1102 1103 /* 1104 * We want transport->tcp_offset to be 8 at the end of this routine 1105 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1106 * When this function is called for the first time, 1107 * transport->tcp_offset is 4 (after having already read the xid). 1108 */ 1109 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1110 len = sizeof(transport->tcp_calldir) - offset; 1111 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1112 p = ((char *) &transport->tcp_calldir) + offset; 1113 used = xdr_skb_read_bits(desc, p, len); 1114 transport->tcp_offset += used; 1115 if (used != len) 1116 return; 1117 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1118 /* 1119 * We don't yet have the XDR buffer, so we will write the calldir 1120 * out after we get the buffer from the 'struct rpc_rqst' 1121 */ 1122 switch (ntohl(transport->tcp_calldir)) { 1123 case RPC_REPLY: 1124 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1125 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1126 transport->tcp_flags |= TCP_RPC_REPLY; 1127 break; 1128 case RPC_CALL: 1129 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1130 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1131 transport->tcp_flags &= ~TCP_RPC_REPLY; 1132 break; 1133 default: 1134 dprintk("RPC: invalid request message type\n"); 1135 xprt_force_disconnect(&transport->xprt); 1136 } 1137 xs_tcp_check_fraghdr(transport); 1138 } 1139 1140 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1141 struct xdr_skb_reader *desc, 1142 struct rpc_rqst *req) 1143 { 1144 struct sock_xprt *transport = 1145 container_of(xprt, struct sock_xprt, xprt); 1146 struct xdr_buf *rcvbuf; 1147 size_t len; 1148 ssize_t r; 1149 1150 rcvbuf = &req->rq_private_buf; 1151 1152 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1153 /* 1154 * Save the RPC direction in the XDR buffer 1155 */ 1156 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1157 &transport->tcp_calldir, 1158 sizeof(transport->tcp_calldir)); 1159 transport->tcp_copied += sizeof(transport->tcp_calldir); 1160 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1161 } 1162 1163 len = desc->count; 1164 if (len > transport->tcp_reclen - transport->tcp_offset) { 1165 struct xdr_skb_reader my_desc; 1166 1167 len = transport->tcp_reclen - transport->tcp_offset; 1168 memcpy(&my_desc, desc, sizeof(my_desc)); 1169 my_desc.count = len; 1170 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1171 &my_desc, xdr_skb_read_bits); 1172 desc->count -= r; 1173 desc->offset += r; 1174 } else 1175 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1176 desc, xdr_skb_read_bits); 1177 1178 if (r > 0) { 1179 transport->tcp_copied += r; 1180 transport->tcp_offset += r; 1181 } 1182 if (r != len) { 1183 /* Error when copying to the receive buffer, 1184 * usually because we weren't able to allocate 1185 * additional buffer pages. All we can do now 1186 * is turn off TCP_RCV_COPY_DATA, so the request 1187 * will not receive any additional updates, 1188 * and time out. 1189 * Any remaining data from this record will 1190 * be discarded. 1191 */ 1192 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1193 dprintk("RPC: XID %08x truncated request\n", 1194 ntohl(transport->tcp_xid)); 1195 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1196 "tcp_offset = %u, tcp_reclen = %u\n", 1197 xprt, transport->tcp_copied, 1198 transport->tcp_offset, transport->tcp_reclen); 1199 return; 1200 } 1201 1202 dprintk("RPC: XID %08x read %Zd bytes\n", 1203 ntohl(transport->tcp_xid), r); 1204 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1205 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1206 transport->tcp_offset, transport->tcp_reclen); 1207 1208 if (transport->tcp_copied == req->rq_private_buf.buflen) 1209 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1210 else if (transport->tcp_offset == transport->tcp_reclen) { 1211 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1212 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1213 } 1214 } 1215 1216 /* 1217 * Finds the request corresponding to the RPC xid and invokes the common 1218 * tcp read code to read the data. 1219 */ 1220 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1221 struct xdr_skb_reader *desc) 1222 { 1223 struct sock_xprt *transport = 1224 container_of(xprt, struct sock_xprt, xprt); 1225 struct rpc_rqst *req; 1226 1227 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1228 1229 /* Find and lock the request corresponding to this xid */ 1230 spin_lock(&xprt->transport_lock); 1231 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1232 if (!req) { 1233 dprintk("RPC: XID %08x request not found!\n", 1234 ntohl(transport->tcp_xid)); 1235 spin_unlock(&xprt->transport_lock); 1236 return -1; 1237 } 1238 1239 xs_tcp_read_common(xprt, desc, req); 1240 1241 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1242 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1243 1244 spin_unlock(&xprt->transport_lock); 1245 return 0; 1246 } 1247 1248 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1249 /* 1250 * Obtains an rpc_rqst previously allocated and invokes the common 1251 * tcp read code to read the data. The result is placed in the callback 1252 * queue. 1253 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1254 * connection and return -1. 1255 */ 1256 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1257 struct xdr_skb_reader *desc) 1258 { 1259 struct sock_xprt *transport = 1260 container_of(xprt, struct sock_xprt, xprt); 1261 struct rpc_rqst *req; 1262 1263 req = xprt_alloc_bc_request(xprt); 1264 if (req == NULL) { 1265 printk(KERN_WARNING "Callback slot table overflowed\n"); 1266 xprt_force_disconnect(xprt); 1267 return -1; 1268 } 1269 1270 req->rq_xid = transport->tcp_xid; 1271 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1272 xs_tcp_read_common(xprt, desc, req); 1273 1274 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1275 struct svc_serv *bc_serv = xprt->bc_serv; 1276 1277 /* 1278 * Add callback request to callback list. The callback 1279 * service sleeps on the sv_cb_waitq waiting for new 1280 * requests. Wake it up after adding enqueing the 1281 * request. 1282 */ 1283 dprintk("RPC: add callback request to list\n"); 1284 spin_lock(&bc_serv->sv_cb_lock); 1285 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1286 spin_unlock(&bc_serv->sv_cb_lock); 1287 wake_up(&bc_serv->sv_cb_waitq); 1288 } 1289 1290 req->rq_private_buf.len = transport->tcp_copied; 1291 1292 return 0; 1293 } 1294 1295 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1296 struct xdr_skb_reader *desc) 1297 { 1298 struct sock_xprt *transport = 1299 container_of(xprt, struct sock_xprt, xprt); 1300 1301 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1302 xs_tcp_read_reply(xprt, desc) : 1303 xs_tcp_read_callback(xprt, desc); 1304 } 1305 #else 1306 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1307 struct xdr_skb_reader *desc) 1308 { 1309 return xs_tcp_read_reply(xprt, desc); 1310 } 1311 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1312 1313 /* 1314 * Read data off the transport. This can be either an RPC_CALL or an 1315 * RPC_REPLY. Relay the processing to helper functions. 1316 */ 1317 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1318 struct xdr_skb_reader *desc) 1319 { 1320 struct sock_xprt *transport = 1321 container_of(xprt, struct sock_xprt, xprt); 1322 1323 if (_xs_tcp_read_data(xprt, desc) == 0) 1324 xs_tcp_check_fraghdr(transport); 1325 else { 1326 /* 1327 * The transport_lock protects the request handling. 1328 * There's no need to hold it to update the tcp_flags. 1329 */ 1330 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1331 } 1332 } 1333 1334 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1335 { 1336 size_t len; 1337 1338 len = transport->tcp_reclen - transport->tcp_offset; 1339 if (len > desc->count) 1340 len = desc->count; 1341 desc->count -= len; 1342 desc->offset += len; 1343 transport->tcp_offset += len; 1344 dprintk("RPC: discarded %Zu bytes\n", len); 1345 xs_tcp_check_fraghdr(transport); 1346 } 1347 1348 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1349 { 1350 struct rpc_xprt *xprt = rd_desc->arg.data; 1351 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1352 struct xdr_skb_reader desc = { 1353 .skb = skb, 1354 .offset = offset, 1355 .count = len, 1356 }; 1357 1358 dprintk("RPC: xs_tcp_data_recv started\n"); 1359 do { 1360 /* Read in a new fragment marker if necessary */ 1361 /* Can we ever really expect to get completely empty fragments? */ 1362 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1363 xs_tcp_read_fraghdr(xprt, &desc); 1364 continue; 1365 } 1366 /* Read in the xid if necessary */ 1367 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1368 xs_tcp_read_xid(transport, &desc); 1369 continue; 1370 } 1371 /* Read in the call/reply flag */ 1372 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1373 xs_tcp_read_calldir(transport, &desc); 1374 continue; 1375 } 1376 /* Read in the request data */ 1377 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1378 xs_tcp_read_data(xprt, &desc); 1379 continue; 1380 } 1381 /* Skip over any trailing bytes on short reads */ 1382 xs_tcp_read_discard(transport, &desc); 1383 } while (desc.count); 1384 dprintk("RPC: xs_tcp_data_recv done\n"); 1385 return len - desc.count; 1386 } 1387 1388 /** 1389 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1390 * @sk: socket with data to read 1391 * @bytes: how much data to read 1392 * 1393 */ 1394 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1395 { 1396 struct rpc_xprt *xprt; 1397 read_descriptor_t rd_desc; 1398 int read; 1399 1400 dprintk("RPC: xs_tcp_data_ready...\n"); 1401 1402 read_lock_bh(&sk->sk_callback_lock); 1403 if (!(xprt = xprt_from_sock(sk))) 1404 goto out; 1405 if (xprt->shutdown) 1406 goto out; 1407 1408 /* Any data means we had a useful conversation, so 1409 * the we don't need to delay the next reconnect 1410 */ 1411 if (xprt->reestablish_timeout) 1412 xprt->reestablish_timeout = 0; 1413 1414 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1415 rd_desc.arg.data = xprt; 1416 do { 1417 rd_desc.count = 65536; 1418 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1419 } while (read > 0); 1420 out: 1421 read_unlock_bh(&sk->sk_callback_lock); 1422 } 1423 1424 /* 1425 * Do the equivalent of linger/linger2 handling for dealing with 1426 * broken servers that don't close the socket in a timely 1427 * fashion 1428 */ 1429 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1430 unsigned long timeout) 1431 { 1432 struct sock_xprt *transport; 1433 1434 if (xprt_test_and_set_connecting(xprt)) 1435 return; 1436 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1437 transport = container_of(xprt, struct sock_xprt, xprt); 1438 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1439 timeout); 1440 } 1441 1442 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1443 { 1444 struct sock_xprt *transport; 1445 1446 transport = container_of(xprt, struct sock_xprt, xprt); 1447 1448 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1449 !cancel_delayed_work(&transport->connect_worker)) 1450 return; 1451 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1452 xprt_clear_connecting(xprt); 1453 } 1454 1455 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1456 { 1457 smp_mb__before_clear_bit(); 1458 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1459 clear_bit(XPRT_CLOSING, &xprt->state); 1460 smp_mb__after_clear_bit(); 1461 /* Mark transport as closed and wake up all pending tasks */ 1462 xprt_disconnect_done(xprt); 1463 } 1464 1465 /** 1466 * xs_tcp_state_change - callback to handle TCP socket state changes 1467 * @sk: socket whose state has changed 1468 * 1469 */ 1470 static void xs_tcp_state_change(struct sock *sk) 1471 { 1472 struct rpc_xprt *xprt; 1473 1474 read_lock_bh(&sk->sk_callback_lock); 1475 if (!(xprt = xprt_from_sock(sk))) 1476 goto out; 1477 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1478 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1479 sk->sk_state, xprt_connected(xprt), 1480 sock_flag(sk, SOCK_DEAD), 1481 sock_flag(sk, SOCK_ZAPPED), 1482 sk->sk_shutdown); 1483 1484 switch (sk->sk_state) { 1485 case TCP_ESTABLISHED: 1486 spin_lock(&xprt->transport_lock); 1487 if (!xprt_test_and_set_connected(xprt)) { 1488 struct sock_xprt *transport = container_of(xprt, 1489 struct sock_xprt, xprt); 1490 1491 /* Reset TCP record info */ 1492 transport->tcp_offset = 0; 1493 transport->tcp_reclen = 0; 1494 transport->tcp_copied = 0; 1495 transport->tcp_flags = 1496 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1497 1498 xprt_wake_pending_tasks(xprt, -EAGAIN); 1499 } 1500 spin_unlock(&xprt->transport_lock); 1501 break; 1502 case TCP_FIN_WAIT1: 1503 /* The client initiated a shutdown of the socket */ 1504 xprt->connect_cookie++; 1505 xprt->reestablish_timeout = 0; 1506 set_bit(XPRT_CLOSING, &xprt->state); 1507 smp_mb__before_clear_bit(); 1508 clear_bit(XPRT_CONNECTED, &xprt->state); 1509 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1510 smp_mb__after_clear_bit(); 1511 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1512 break; 1513 case TCP_CLOSE_WAIT: 1514 /* The server initiated a shutdown of the socket */ 1515 xprt_force_disconnect(xprt); 1516 xprt->connect_cookie++; 1517 case TCP_CLOSING: 1518 /* 1519 * If the server closed down the connection, make sure that 1520 * we back off before reconnecting 1521 */ 1522 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1523 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1524 break; 1525 case TCP_LAST_ACK: 1526 set_bit(XPRT_CLOSING, &xprt->state); 1527 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1528 smp_mb__before_clear_bit(); 1529 clear_bit(XPRT_CONNECTED, &xprt->state); 1530 smp_mb__after_clear_bit(); 1531 break; 1532 case TCP_CLOSE: 1533 xs_tcp_cancel_linger_timeout(xprt); 1534 xs_sock_mark_closed(xprt); 1535 } 1536 out: 1537 read_unlock_bh(&sk->sk_callback_lock); 1538 } 1539 1540 /** 1541 * xs_error_report - callback mainly for catching socket errors 1542 * @sk: socket 1543 */ 1544 static void xs_error_report(struct sock *sk) 1545 { 1546 struct rpc_xprt *xprt; 1547 1548 read_lock_bh(&sk->sk_callback_lock); 1549 if (!(xprt = xprt_from_sock(sk))) 1550 goto out; 1551 dprintk("RPC: %s client %p...\n" 1552 "RPC: error %d\n", 1553 __func__, xprt, sk->sk_err); 1554 xprt_wake_pending_tasks(xprt, -EAGAIN); 1555 out: 1556 read_unlock_bh(&sk->sk_callback_lock); 1557 } 1558 1559 static void xs_write_space(struct sock *sk) 1560 { 1561 struct socket *sock; 1562 struct rpc_xprt *xprt; 1563 1564 if (unlikely(!(sock = sk->sk_socket))) 1565 return; 1566 clear_bit(SOCK_NOSPACE, &sock->flags); 1567 1568 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1569 return; 1570 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1571 return; 1572 1573 xprt_write_space(xprt); 1574 } 1575 1576 /** 1577 * xs_udp_write_space - callback invoked when socket buffer space 1578 * becomes available 1579 * @sk: socket whose state has changed 1580 * 1581 * Called when more output buffer space is available for this socket. 1582 * We try not to wake our writers until they can make "significant" 1583 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1584 * with a bunch of small requests. 1585 */ 1586 static void xs_udp_write_space(struct sock *sk) 1587 { 1588 read_lock_bh(&sk->sk_callback_lock); 1589 1590 /* from net/core/sock.c:sock_def_write_space */ 1591 if (sock_writeable(sk)) 1592 xs_write_space(sk); 1593 1594 read_unlock_bh(&sk->sk_callback_lock); 1595 } 1596 1597 /** 1598 * xs_tcp_write_space - callback invoked when socket buffer space 1599 * becomes available 1600 * @sk: socket whose state has changed 1601 * 1602 * Called when more output buffer space is available for this socket. 1603 * We try not to wake our writers until they can make "significant" 1604 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1605 * with a bunch of small requests. 1606 */ 1607 static void xs_tcp_write_space(struct sock *sk) 1608 { 1609 read_lock_bh(&sk->sk_callback_lock); 1610 1611 /* from net/core/stream.c:sk_stream_write_space */ 1612 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1613 xs_write_space(sk); 1614 1615 read_unlock_bh(&sk->sk_callback_lock); 1616 } 1617 1618 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1619 { 1620 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1621 struct sock *sk = transport->inet; 1622 1623 if (transport->rcvsize) { 1624 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1625 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1626 } 1627 if (transport->sndsize) { 1628 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1629 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1630 sk->sk_write_space(sk); 1631 } 1632 } 1633 1634 /** 1635 * xs_udp_set_buffer_size - set send and receive limits 1636 * @xprt: generic transport 1637 * @sndsize: requested size of send buffer, in bytes 1638 * @rcvsize: requested size of receive buffer, in bytes 1639 * 1640 * Set socket send and receive buffer size limits. 1641 */ 1642 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1643 { 1644 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1645 1646 transport->sndsize = 0; 1647 if (sndsize) 1648 transport->sndsize = sndsize + 1024; 1649 transport->rcvsize = 0; 1650 if (rcvsize) 1651 transport->rcvsize = rcvsize + 1024; 1652 1653 xs_udp_do_set_buffer_size(xprt); 1654 } 1655 1656 /** 1657 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1658 * @task: task that timed out 1659 * 1660 * Adjust the congestion window after a retransmit timeout has occurred. 1661 */ 1662 static void xs_udp_timer(struct rpc_task *task) 1663 { 1664 xprt_adjust_cwnd(task, -ETIMEDOUT); 1665 } 1666 1667 static unsigned short xs_get_random_port(void) 1668 { 1669 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1670 unsigned short rand = (unsigned short) net_random() % range; 1671 return rand + xprt_min_resvport; 1672 } 1673 1674 /** 1675 * xs_set_port - reset the port number in the remote endpoint address 1676 * @xprt: generic transport 1677 * @port: new port number 1678 * 1679 */ 1680 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1681 { 1682 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1683 1684 rpc_set_port(xs_addr(xprt), port); 1685 xs_update_peer_port(xprt); 1686 } 1687 1688 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1689 { 1690 unsigned short port = transport->srcport; 1691 1692 if (port == 0 && transport->xprt.resvport) 1693 port = xs_get_random_port(); 1694 return port; 1695 } 1696 1697 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1698 { 1699 if (transport->srcport != 0) 1700 transport->srcport = 0; 1701 if (!transport->xprt.resvport) 1702 return 0; 1703 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1704 return xprt_max_resvport; 1705 return --port; 1706 } 1707 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1708 { 1709 struct sockaddr_storage myaddr; 1710 int err, nloop = 0; 1711 unsigned short port = xs_get_srcport(transport); 1712 unsigned short last; 1713 1714 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1715 do { 1716 rpc_set_port((struct sockaddr *)&myaddr, port); 1717 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1718 transport->xprt.addrlen); 1719 if (port == 0) 1720 break; 1721 if (err == 0) { 1722 transport->srcport = port; 1723 break; 1724 } 1725 last = port; 1726 port = xs_next_srcport(transport, port); 1727 if (port > last) 1728 nloop++; 1729 } while (err == -EADDRINUSE && nloop != 2); 1730 1731 if (myaddr.ss_family == AF_INET) 1732 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1733 &((struct sockaddr_in *)&myaddr)->sin_addr, 1734 port, err ? "failed" : "ok", err); 1735 else 1736 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1737 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1738 port, err ? "failed" : "ok", err); 1739 return err; 1740 } 1741 1742 /* 1743 * We don't support autobind on AF_LOCAL sockets 1744 */ 1745 static void xs_local_rpcbind(struct rpc_task *task) 1746 { 1747 xprt_set_bound(task->tk_xprt); 1748 } 1749 1750 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1751 { 1752 } 1753 1754 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1755 static struct lock_class_key xs_key[2]; 1756 static struct lock_class_key xs_slock_key[2]; 1757 1758 static inline void xs_reclassify_socketu(struct socket *sock) 1759 { 1760 struct sock *sk = sock->sk; 1761 1762 BUG_ON(sock_owned_by_user(sk)); 1763 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1764 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1765 } 1766 1767 static inline void xs_reclassify_socket4(struct socket *sock) 1768 { 1769 struct sock *sk = sock->sk; 1770 1771 BUG_ON(sock_owned_by_user(sk)); 1772 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1773 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1774 } 1775 1776 static inline void xs_reclassify_socket6(struct socket *sock) 1777 { 1778 struct sock *sk = sock->sk; 1779 1780 BUG_ON(sock_owned_by_user(sk)); 1781 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1782 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1783 } 1784 1785 static inline void xs_reclassify_socket(int family, struct socket *sock) 1786 { 1787 switch (family) { 1788 case AF_LOCAL: 1789 xs_reclassify_socketu(sock); 1790 break; 1791 case AF_INET: 1792 xs_reclassify_socket4(sock); 1793 break; 1794 case AF_INET6: 1795 xs_reclassify_socket6(sock); 1796 break; 1797 } 1798 } 1799 #else 1800 static inline void xs_reclassify_socketu(struct socket *sock) 1801 { 1802 } 1803 1804 static inline void xs_reclassify_socket4(struct socket *sock) 1805 { 1806 } 1807 1808 static inline void xs_reclassify_socket6(struct socket *sock) 1809 { 1810 } 1811 1812 static inline void xs_reclassify_socket(int family, struct socket *sock) 1813 { 1814 } 1815 #endif 1816 1817 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1818 struct sock_xprt *transport, int family, int type, int protocol) 1819 { 1820 struct socket *sock; 1821 int err; 1822 1823 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1824 if (err < 0) { 1825 dprintk("RPC: can't create %d transport socket (%d).\n", 1826 protocol, -err); 1827 goto out; 1828 } 1829 xs_reclassify_socket(family, sock); 1830 1831 err = xs_bind(transport, sock); 1832 if (err) { 1833 sock_release(sock); 1834 goto out; 1835 } 1836 1837 return sock; 1838 out: 1839 return ERR_PTR(err); 1840 } 1841 1842 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1843 struct socket *sock) 1844 { 1845 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1846 xprt); 1847 1848 if (!transport->inet) { 1849 struct sock *sk = sock->sk; 1850 1851 write_lock_bh(&sk->sk_callback_lock); 1852 1853 xs_save_old_callbacks(transport, sk); 1854 1855 sk->sk_user_data = xprt; 1856 sk->sk_data_ready = xs_local_data_ready; 1857 sk->sk_write_space = xs_udp_write_space; 1858 sk->sk_error_report = xs_error_report; 1859 sk->sk_allocation = GFP_ATOMIC; 1860 1861 xprt_clear_connected(xprt); 1862 1863 /* Reset to new socket */ 1864 transport->sock = sock; 1865 transport->inet = sk; 1866 1867 write_unlock_bh(&sk->sk_callback_lock); 1868 } 1869 1870 /* Tell the socket layer to start connecting... */ 1871 xprt->stat.connect_count++; 1872 xprt->stat.connect_start = jiffies; 1873 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1874 } 1875 1876 /** 1877 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1878 * @xprt: RPC transport to connect 1879 * @transport: socket transport to connect 1880 * @create_sock: function to create a socket of the correct type 1881 * 1882 * Invoked by a work queue tasklet. 1883 */ 1884 static void xs_local_setup_socket(struct work_struct *work) 1885 { 1886 struct sock_xprt *transport = 1887 container_of(work, struct sock_xprt, connect_worker.work); 1888 struct rpc_xprt *xprt = &transport->xprt; 1889 struct socket *sock; 1890 int status = -EIO; 1891 1892 if (xprt->shutdown) 1893 goto out; 1894 1895 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1896 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1897 SOCK_STREAM, 0, &sock, 1); 1898 if (status < 0) { 1899 dprintk("RPC: can't create AF_LOCAL " 1900 "transport socket (%d).\n", -status); 1901 goto out; 1902 } 1903 xs_reclassify_socketu(sock); 1904 1905 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1906 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1907 1908 status = xs_local_finish_connecting(xprt, sock); 1909 switch (status) { 1910 case 0: 1911 dprintk("RPC: xprt %p connected to %s\n", 1912 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1913 xprt_set_connected(xprt); 1914 break; 1915 case -ENOENT: 1916 dprintk("RPC: xprt %p: socket %s does not exist\n", 1917 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1918 break; 1919 default: 1920 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1921 __func__, -status, 1922 xprt->address_strings[RPC_DISPLAY_ADDR]); 1923 } 1924 1925 out: 1926 xprt_clear_connecting(xprt); 1927 xprt_wake_pending_tasks(xprt, status); 1928 } 1929 1930 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1931 { 1932 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1933 1934 if (!transport->inet) { 1935 struct sock *sk = sock->sk; 1936 1937 write_lock_bh(&sk->sk_callback_lock); 1938 1939 xs_save_old_callbacks(transport, sk); 1940 1941 sk->sk_user_data = xprt; 1942 sk->sk_data_ready = xs_udp_data_ready; 1943 sk->sk_write_space = xs_udp_write_space; 1944 sk->sk_error_report = xs_error_report; 1945 sk->sk_no_check = UDP_CSUM_NORCV; 1946 sk->sk_allocation = GFP_ATOMIC; 1947 1948 xprt_set_connected(xprt); 1949 1950 /* Reset to new socket */ 1951 transport->sock = sock; 1952 transport->inet = sk; 1953 1954 write_unlock_bh(&sk->sk_callback_lock); 1955 } 1956 xs_udp_do_set_buffer_size(xprt); 1957 } 1958 1959 static void xs_udp_setup_socket(struct work_struct *work) 1960 { 1961 struct sock_xprt *transport = 1962 container_of(work, struct sock_xprt, connect_worker.work); 1963 struct rpc_xprt *xprt = &transport->xprt; 1964 struct socket *sock = transport->sock; 1965 int status = -EIO; 1966 1967 if (xprt->shutdown) 1968 goto out; 1969 1970 /* Start by resetting any existing state */ 1971 xs_reset_transport(transport); 1972 sock = xs_create_sock(xprt, transport, 1973 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 1974 if (IS_ERR(sock)) 1975 goto out; 1976 1977 dprintk("RPC: worker connecting xprt %p via %s to " 1978 "%s (port %s)\n", xprt, 1979 xprt->address_strings[RPC_DISPLAY_PROTO], 1980 xprt->address_strings[RPC_DISPLAY_ADDR], 1981 xprt->address_strings[RPC_DISPLAY_PORT]); 1982 1983 xs_udp_finish_connecting(xprt, sock); 1984 status = 0; 1985 out: 1986 xprt_clear_connecting(xprt); 1987 xprt_wake_pending_tasks(xprt, status); 1988 } 1989 1990 /* 1991 * We need to preserve the port number so the reply cache on the server can 1992 * find our cached RPC replies when we get around to reconnecting. 1993 */ 1994 static void xs_abort_connection(struct sock_xprt *transport) 1995 { 1996 int result; 1997 struct sockaddr any; 1998 1999 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2000 2001 /* 2002 * Disconnect the transport socket by doing a connect operation 2003 * with AF_UNSPEC. This should return immediately... 2004 */ 2005 memset(&any, 0, sizeof(any)); 2006 any.sa_family = AF_UNSPEC; 2007 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2008 if (!result) 2009 xs_sock_mark_closed(&transport->xprt); 2010 else 2011 dprintk("RPC: AF_UNSPEC connect return code %d\n", 2012 result); 2013 } 2014 2015 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2016 { 2017 unsigned int state = transport->inet->sk_state; 2018 2019 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2020 /* we don't need to abort the connection if the socket 2021 * hasn't undergone a shutdown 2022 */ 2023 if (transport->inet->sk_shutdown == 0) 2024 return; 2025 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2026 __func__, transport->inet->sk_shutdown); 2027 } 2028 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2029 /* we don't need to abort the connection if the socket 2030 * hasn't undergone a shutdown 2031 */ 2032 if (transport->inet->sk_shutdown == 0) 2033 return; 2034 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2035 "sk_shutdown set to %d\n", 2036 __func__, transport->inet->sk_shutdown); 2037 } 2038 xs_abort_connection(transport); 2039 } 2040 2041 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2042 { 2043 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2044 int ret = -ENOTCONN; 2045 2046 if (!transport->inet) { 2047 struct sock *sk = sock->sk; 2048 2049 write_lock_bh(&sk->sk_callback_lock); 2050 2051 xs_save_old_callbacks(transport, sk); 2052 2053 sk->sk_user_data = xprt; 2054 sk->sk_data_ready = xs_tcp_data_ready; 2055 sk->sk_state_change = xs_tcp_state_change; 2056 sk->sk_write_space = xs_tcp_write_space; 2057 sk->sk_error_report = xs_error_report; 2058 sk->sk_allocation = GFP_ATOMIC; 2059 2060 /* socket options */ 2061 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2062 sock_reset_flag(sk, SOCK_LINGER); 2063 tcp_sk(sk)->linger2 = 0; 2064 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2065 2066 xprt_clear_connected(xprt); 2067 2068 /* Reset to new socket */ 2069 transport->sock = sock; 2070 transport->inet = sk; 2071 2072 write_unlock_bh(&sk->sk_callback_lock); 2073 } 2074 2075 if (!xprt_bound(xprt)) 2076 goto out; 2077 2078 /* Tell the socket layer to start connecting... */ 2079 xprt->stat.connect_count++; 2080 xprt->stat.connect_start = jiffies; 2081 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2082 switch (ret) { 2083 case 0: 2084 case -EINPROGRESS: 2085 /* SYN_SENT! */ 2086 xprt->connect_cookie++; 2087 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2088 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2089 } 2090 out: 2091 return ret; 2092 } 2093 2094 /** 2095 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2096 * @xprt: RPC transport to connect 2097 * @transport: socket transport to connect 2098 * @create_sock: function to create a socket of the correct type 2099 * 2100 * Invoked by a work queue tasklet. 2101 */ 2102 static void xs_tcp_setup_socket(struct work_struct *work) 2103 { 2104 struct sock_xprt *transport = 2105 container_of(work, struct sock_xprt, connect_worker.work); 2106 struct socket *sock = transport->sock; 2107 struct rpc_xprt *xprt = &transport->xprt; 2108 int status = -EIO; 2109 2110 if (xprt->shutdown) 2111 goto out; 2112 2113 if (!sock) { 2114 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2115 sock = xs_create_sock(xprt, transport, 2116 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2117 if (IS_ERR(sock)) { 2118 status = PTR_ERR(sock); 2119 goto out; 2120 } 2121 } else { 2122 int abort_and_exit; 2123 2124 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2125 &xprt->state); 2126 /* "close" the socket, preserving the local port */ 2127 xs_tcp_reuse_connection(transport); 2128 2129 if (abort_and_exit) 2130 goto out_eagain; 2131 } 2132 2133 dprintk("RPC: worker connecting xprt %p via %s to " 2134 "%s (port %s)\n", xprt, 2135 xprt->address_strings[RPC_DISPLAY_PROTO], 2136 xprt->address_strings[RPC_DISPLAY_ADDR], 2137 xprt->address_strings[RPC_DISPLAY_PORT]); 2138 2139 status = xs_tcp_finish_connecting(xprt, sock); 2140 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2141 xprt, -status, xprt_connected(xprt), 2142 sock->sk->sk_state); 2143 switch (status) { 2144 default: 2145 printk("%s: connect returned unhandled error %d\n", 2146 __func__, status); 2147 case -EADDRNOTAVAIL: 2148 /* We're probably in TIME_WAIT. Get rid of existing socket, 2149 * and retry 2150 */ 2151 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 2152 xprt_force_disconnect(xprt); 2153 break; 2154 case -ECONNREFUSED: 2155 case -ECONNRESET: 2156 case -ENETUNREACH: 2157 /* retry with existing socket, after a delay */ 2158 case 0: 2159 case -EINPROGRESS: 2160 case -EALREADY: 2161 xprt_clear_connecting(xprt); 2162 return; 2163 case -EINVAL: 2164 /* Happens, for instance, if the user specified a link 2165 * local IPv6 address without a scope-id. 2166 */ 2167 goto out; 2168 } 2169 out_eagain: 2170 status = -EAGAIN; 2171 out: 2172 xprt_clear_connecting(xprt); 2173 xprt_wake_pending_tasks(xprt, status); 2174 } 2175 2176 /** 2177 * xs_connect - connect a socket to a remote endpoint 2178 * @task: address of RPC task that manages state of connect request 2179 * 2180 * TCP: If the remote end dropped the connection, delay reconnecting. 2181 * 2182 * UDP socket connects are synchronous, but we use a work queue anyway 2183 * to guarantee that even unprivileged user processes can set up a 2184 * socket on a privileged port. 2185 * 2186 * If a UDP socket connect fails, the delay behavior here prevents 2187 * retry floods (hard mounts). 2188 */ 2189 static void xs_connect(struct rpc_task *task) 2190 { 2191 struct rpc_xprt *xprt = task->tk_xprt; 2192 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2193 2194 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2195 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2196 "seconds\n", 2197 xprt, xprt->reestablish_timeout / HZ); 2198 queue_delayed_work(rpciod_workqueue, 2199 &transport->connect_worker, 2200 xprt->reestablish_timeout); 2201 xprt->reestablish_timeout <<= 1; 2202 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2203 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2204 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2205 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2206 } else { 2207 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2208 queue_delayed_work(rpciod_workqueue, 2209 &transport->connect_worker, 0); 2210 } 2211 } 2212 2213 /** 2214 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2215 * @xprt: rpc_xprt struct containing statistics 2216 * @seq: output file 2217 * 2218 */ 2219 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2220 { 2221 long idle_time = 0; 2222 2223 if (xprt_connected(xprt)) 2224 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2225 2226 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2227 "%llu %llu %lu %llu %llu\n", 2228 xprt->stat.bind_count, 2229 xprt->stat.connect_count, 2230 xprt->stat.connect_time, 2231 idle_time, 2232 xprt->stat.sends, 2233 xprt->stat.recvs, 2234 xprt->stat.bad_xids, 2235 xprt->stat.req_u, 2236 xprt->stat.bklog_u, 2237 xprt->stat.max_slots, 2238 xprt->stat.sending_u, 2239 xprt->stat.pending_u); 2240 } 2241 2242 /** 2243 * xs_udp_print_stats - display UDP socket-specifc stats 2244 * @xprt: rpc_xprt struct containing statistics 2245 * @seq: output file 2246 * 2247 */ 2248 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2249 { 2250 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2251 2252 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2253 "%lu %llu %llu\n", 2254 transport->srcport, 2255 xprt->stat.bind_count, 2256 xprt->stat.sends, 2257 xprt->stat.recvs, 2258 xprt->stat.bad_xids, 2259 xprt->stat.req_u, 2260 xprt->stat.bklog_u, 2261 xprt->stat.max_slots, 2262 xprt->stat.sending_u, 2263 xprt->stat.pending_u); 2264 } 2265 2266 /** 2267 * xs_tcp_print_stats - display TCP socket-specifc stats 2268 * @xprt: rpc_xprt struct containing statistics 2269 * @seq: output file 2270 * 2271 */ 2272 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2273 { 2274 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2275 long idle_time = 0; 2276 2277 if (xprt_connected(xprt)) 2278 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2279 2280 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2281 "%llu %llu %lu %llu %llu\n", 2282 transport->srcport, 2283 xprt->stat.bind_count, 2284 xprt->stat.connect_count, 2285 xprt->stat.connect_time, 2286 idle_time, 2287 xprt->stat.sends, 2288 xprt->stat.recvs, 2289 xprt->stat.bad_xids, 2290 xprt->stat.req_u, 2291 xprt->stat.bklog_u, 2292 xprt->stat.max_slots, 2293 xprt->stat.sending_u, 2294 xprt->stat.pending_u); 2295 } 2296 2297 /* 2298 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2299 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2300 * to use the server side send routines. 2301 */ 2302 static void *bc_malloc(struct rpc_task *task, size_t size) 2303 { 2304 struct page *page; 2305 struct rpc_buffer *buf; 2306 2307 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2308 page = alloc_page(GFP_KERNEL); 2309 2310 if (!page) 2311 return NULL; 2312 2313 buf = page_address(page); 2314 buf->len = PAGE_SIZE; 2315 2316 return buf->data; 2317 } 2318 2319 /* 2320 * Free the space allocated in the bc_alloc routine 2321 */ 2322 static void bc_free(void *buffer) 2323 { 2324 struct rpc_buffer *buf; 2325 2326 if (!buffer) 2327 return; 2328 2329 buf = container_of(buffer, struct rpc_buffer, data); 2330 free_page((unsigned long)buf); 2331 } 2332 2333 /* 2334 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2335 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2336 */ 2337 static int bc_sendto(struct rpc_rqst *req) 2338 { 2339 int len; 2340 struct xdr_buf *xbufp = &req->rq_snd_buf; 2341 struct rpc_xprt *xprt = req->rq_xprt; 2342 struct sock_xprt *transport = 2343 container_of(xprt, struct sock_xprt, xprt); 2344 struct socket *sock = transport->sock; 2345 unsigned long headoff; 2346 unsigned long tailoff; 2347 2348 xs_encode_stream_record_marker(xbufp); 2349 2350 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2351 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2352 len = svc_send_common(sock, xbufp, 2353 virt_to_page(xbufp->head[0].iov_base), headoff, 2354 xbufp->tail[0].iov_base, tailoff); 2355 2356 if (len != xbufp->len) { 2357 printk(KERN_NOTICE "Error sending entire callback!\n"); 2358 len = -EAGAIN; 2359 } 2360 2361 return len; 2362 } 2363 2364 /* 2365 * The send routine. Borrows from svc_send 2366 */ 2367 static int bc_send_request(struct rpc_task *task) 2368 { 2369 struct rpc_rqst *req = task->tk_rqstp; 2370 struct svc_xprt *xprt; 2371 struct svc_sock *svsk; 2372 u32 len; 2373 2374 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2375 /* 2376 * Get the server socket associated with this callback xprt 2377 */ 2378 xprt = req->rq_xprt->bc_xprt; 2379 svsk = container_of(xprt, struct svc_sock, sk_xprt); 2380 2381 /* 2382 * Grab the mutex to serialize data as the connection is shared 2383 * with the fore channel 2384 */ 2385 if (!mutex_trylock(&xprt->xpt_mutex)) { 2386 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2387 if (!mutex_trylock(&xprt->xpt_mutex)) 2388 return -EAGAIN; 2389 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2390 } 2391 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2392 len = -ENOTCONN; 2393 else 2394 len = bc_sendto(req); 2395 mutex_unlock(&xprt->xpt_mutex); 2396 2397 if (len > 0) 2398 len = 0; 2399 2400 return len; 2401 } 2402 2403 /* 2404 * The close routine. Since this is client initiated, we do nothing 2405 */ 2406 2407 static void bc_close(struct rpc_xprt *xprt) 2408 { 2409 } 2410 2411 /* 2412 * The xprt destroy routine. Again, because this connection is client 2413 * initiated, we do nothing 2414 */ 2415 2416 static void bc_destroy(struct rpc_xprt *xprt) 2417 { 2418 } 2419 2420 static struct rpc_xprt_ops xs_local_ops = { 2421 .reserve_xprt = xprt_reserve_xprt, 2422 .release_xprt = xs_tcp_release_xprt, 2423 .rpcbind = xs_local_rpcbind, 2424 .set_port = xs_local_set_port, 2425 .connect = xs_connect, 2426 .buf_alloc = rpc_malloc, 2427 .buf_free = rpc_free, 2428 .send_request = xs_local_send_request, 2429 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2430 .close = xs_close, 2431 .destroy = xs_destroy, 2432 .print_stats = xs_local_print_stats, 2433 }; 2434 2435 static struct rpc_xprt_ops xs_udp_ops = { 2436 .set_buffer_size = xs_udp_set_buffer_size, 2437 .reserve_xprt = xprt_reserve_xprt_cong, 2438 .release_xprt = xprt_release_xprt_cong, 2439 .rpcbind = rpcb_getport_async, 2440 .set_port = xs_set_port, 2441 .connect = xs_connect, 2442 .buf_alloc = rpc_malloc, 2443 .buf_free = rpc_free, 2444 .send_request = xs_udp_send_request, 2445 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2446 .timer = xs_udp_timer, 2447 .release_request = xprt_release_rqst_cong, 2448 .close = xs_close, 2449 .destroy = xs_destroy, 2450 .print_stats = xs_udp_print_stats, 2451 }; 2452 2453 static struct rpc_xprt_ops xs_tcp_ops = { 2454 .reserve_xprt = xprt_reserve_xprt, 2455 .release_xprt = xs_tcp_release_xprt, 2456 .rpcbind = rpcb_getport_async, 2457 .set_port = xs_set_port, 2458 .connect = xs_connect, 2459 .buf_alloc = rpc_malloc, 2460 .buf_free = rpc_free, 2461 .send_request = xs_tcp_send_request, 2462 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2463 .close = xs_tcp_close, 2464 .destroy = xs_destroy, 2465 .print_stats = xs_tcp_print_stats, 2466 }; 2467 2468 /* 2469 * The rpc_xprt_ops for the server backchannel 2470 */ 2471 2472 static struct rpc_xprt_ops bc_tcp_ops = { 2473 .reserve_xprt = xprt_reserve_xprt, 2474 .release_xprt = xprt_release_xprt, 2475 .rpcbind = xs_local_rpcbind, 2476 .buf_alloc = bc_malloc, 2477 .buf_free = bc_free, 2478 .send_request = bc_send_request, 2479 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2480 .close = bc_close, 2481 .destroy = bc_destroy, 2482 .print_stats = xs_tcp_print_stats, 2483 }; 2484 2485 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2486 { 2487 static const struct sockaddr_in sin = { 2488 .sin_family = AF_INET, 2489 .sin_addr.s_addr = htonl(INADDR_ANY), 2490 }; 2491 static const struct sockaddr_in6 sin6 = { 2492 .sin6_family = AF_INET6, 2493 .sin6_addr = IN6ADDR_ANY_INIT, 2494 }; 2495 2496 switch (family) { 2497 case AF_LOCAL: 2498 break; 2499 case AF_INET: 2500 memcpy(sap, &sin, sizeof(sin)); 2501 break; 2502 case AF_INET6: 2503 memcpy(sap, &sin6, sizeof(sin6)); 2504 break; 2505 default: 2506 dprintk("RPC: %s: Bad address family\n", __func__); 2507 return -EAFNOSUPPORT; 2508 } 2509 return 0; 2510 } 2511 2512 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2513 unsigned int slot_table_size, 2514 unsigned int max_slot_table_size) 2515 { 2516 struct rpc_xprt *xprt; 2517 struct sock_xprt *new; 2518 2519 if (args->addrlen > sizeof(xprt->addr)) { 2520 dprintk("RPC: xs_setup_xprt: address too large\n"); 2521 return ERR_PTR(-EBADF); 2522 } 2523 2524 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2525 max_slot_table_size); 2526 if (xprt == NULL) { 2527 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2528 "rpc_xprt\n"); 2529 return ERR_PTR(-ENOMEM); 2530 } 2531 2532 new = container_of(xprt, struct sock_xprt, xprt); 2533 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2534 xprt->addrlen = args->addrlen; 2535 if (args->srcaddr) 2536 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2537 else { 2538 int err; 2539 err = xs_init_anyaddr(args->dstaddr->sa_family, 2540 (struct sockaddr *)&new->srcaddr); 2541 if (err != 0) { 2542 xprt_free(xprt); 2543 return ERR_PTR(err); 2544 } 2545 } 2546 2547 return xprt; 2548 } 2549 2550 static const struct rpc_timeout xs_local_default_timeout = { 2551 .to_initval = 10 * HZ, 2552 .to_maxval = 10 * HZ, 2553 .to_retries = 2, 2554 }; 2555 2556 /** 2557 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2558 * @args: rpc transport creation arguments 2559 * 2560 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2561 */ 2562 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2563 { 2564 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2565 struct sock_xprt *transport; 2566 struct rpc_xprt *xprt; 2567 struct rpc_xprt *ret; 2568 2569 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2570 xprt_max_tcp_slot_table_entries); 2571 if (IS_ERR(xprt)) 2572 return xprt; 2573 transport = container_of(xprt, struct sock_xprt, xprt); 2574 2575 xprt->prot = 0; 2576 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2577 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2578 2579 xprt->bind_timeout = XS_BIND_TO; 2580 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2581 xprt->idle_timeout = XS_IDLE_DISC_TO; 2582 2583 xprt->ops = &xs_local_ops; 2584 xprt->timeout = &xs_local_default_timeout; 2585 2586 switch (sun->sun_family) { 2587 case AF_LOCAL: 2588 if (sun->sun_path[0] != '/') { 2589 dprintk("RPC: bad AF_LOCAL address: %s\n", 2590 sun->sun_path); 2591 ret = ERR_PTR(-EINVAL); 2592 goto out_err; 2593 } 2594 xprt_set_bound(xprt); 2595 INIT_DELAYED_WORK(&transport->connect_worker, 2596 xs_local_setup_socket); 2597 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2598 break; 2599 default: 2600 ret = ERR_PTR(-EAFNOSUPPORT); 2601 goto out_err; 2602 } 2603 2604 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2605 xprt->address_strings[RPC_DISPLAY_ADDR]); 2606 2607 if (try_module_get(THIS_MODULE)) 2608 return xprt; 2609 ret = ERR_PTR(-EINVAL); 2610 out_err: 2611 xprt_free(xprt); 2612 return ret; 2613 } 2614 2615 static const struct rpc_timeout xs_udp_default_timeout = { 2616 .to_initval = 5 * HZ, 2617 .to_maxval = 30 * HZ, 2618 .to_increment = 5 * HZ, 2619 .to_retries = 5, 2620 }; 2621 2622 /** 2623 * xs_setup_udp - Set up transport to use a UDP socket 2624 * @args: rpc transport creation arguments 2625 * 2626 */ 2627 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2628 { 2629 struct sockaddr *addr = args->dstaddr; 2630 struct rpc_xprt *xprt; 2631 struct sock_xprt *transport; 2632 struct rpc_xprt *ret; 2633 2634 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2635 xprt_udp_slot_table_entries); 2636 if (IS_ERR(xprt)) 2637 return xprt; 2638 transport = container_of(xprt, struct sock_xprt, xprt); 2639 2640 xprt->prot = IPPROTO_UDP; 2641 xprt->tsh_size = 0; 2642 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2643 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2644 2645 xprt->bind_timeout = XS_BIND_TO; 2646 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2647 xprt->idle_timeout = XS_IDLE_DISC_TO; 2648 2649 xprt->ops = &xs_udp_ops; 2650 2651 xprt->timeout = &xs_udp_default_timeout; 2652 2653 switch (addr->sa_family) { 2654 case AF_INET: 2655 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2656 xprt_set_bound(xprt); 2657 2658 INIT_DELAYED_WORK(&transport->connect_worker, 2659 xs_udp_setup_socket); 2660 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2661 break; 2662 case AF_INET6: 2663 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2664 xprt_set_bound(xprt); 2665 2666 INIT_DELAYED_WORK(&transport->connect_worker, 2667 xs_udp_setup_socket); 2668 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2669 break; 2670 default: 2671 ret = ERR_PTR(-EAFNOSUPPORT); 2672 goto out_err; 2673 } 2674 2675 if (xprt_bound(xprt)) 2676 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2677 xprt->address_strings[RPC_DISPLAY_ADDR], 2678 xprt->address_strings[RPC_DISPLAY_PORT], 2679 xprt->address_strings[RPC_DISPLAY_PROTO]); 2680 else 2681 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2682 xprt->address_strings[RPC_DISPLAY_ADDR], 2683 xprt->address_strings[RPC_DISPLAY_PROTO]); 2684 2685 if (try_module_get(THIS_MODULE)) 2686 return xprt; 2687 ret = ERR_PTR(-EINVAL); 2688 out_err: 2689 xprt_free(xprt); 2690 return ret; 2691 } 2692 2693 static const struct rpc_timeout xs_tcp_default_timeout = { 2694 .to_initval = 60 * HZ, 2695 .to_maxval = 60 * HZ, 2696 .to_retries = 2, 2697 }; 2698 2699 /** 2700 * xs_setup_tcp - Set up transport to use a TCP socket 2701 * @args: rpc transport creation arguments 2702 * 2703 */ 2704 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2705 { 2706 struct sockaddr *addr = args->dstaddr; 2707 struct rpc_xprt *xprt; 2708 struct sock_xprt *transport; 2709 struct rpc_xprt *ret; 2710 2711 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2712 xprt_max_tcp_slot_table_entries); 2713 if (IS_ERR(xprt)) 2714 return xprt; 2715 transport = container_of(xprt, struct sock_xprt, xprt); 2716 2717 xprt->prot = IPPROTO_TCP; 2718 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2719 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2720 2721 xprt->bind_timeout = XS_BIND_TO; 2722 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2723 xprt->idle_timeout = XS_IDLE_DISC_TO; 2724 2725 xprt->ops = &xs_tcp_ops; 2726 xprt->timeout = &xs_tcp_default_timeout; 2727 2728 switch (addr->sa_family) { 2729 case AF_INET: 2730 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2731 xprt_set_bound(xprt); 2732 2733 INIT_DELAYED_WORK(&transport->connect_worker, 2734 xs_tcp_setup_socket); 2735 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2736 break; 2737 case AF_INET6: 2738 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2739 xprt_set_bound(xprt); 2740 2741 INIT_DELAYED_WORK(&transport->connect_worker, 2742 xs_tcp_setup_socket); 2743 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2744 break; 2745 default: 2746 ret = ERR_PTR(-EAFNOSUPPORT); 2747 goto out_err; 2748 } 2749 2750 if (xprt_bound(xprt)) 2751 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2752 xprt->address_strings[RPC_DISPLAY_ADDR], 2753 xprt->address_strings[RPC_DISPLAY_PORT], 2754 xprt->address_strings[RPC_DISPLAY_PROTO]); 2755 else 2756 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2757 xprt->address_strings[RPC_DISPLAY_ADDR], 2758 xprt->address_strings[RPC_DISPLAY_PROTO]); 2759 2760 2761 if (try_module_get(THIS_MODULE)) 2762 return xprt; 2763 ret = ERR_PTR(-EINVAL); 2764 out_err: 2765 xprt_free(xprt); 2766 return ret; 2767 } 2768 2769 /** 2770 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2771 * @args: rpc transport creation arguments 2772 * 2773 */ 2774 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2775 { 2776 struct sockaddr *addr = args->dstaddr; 2777 struct rpc_xprt *xprt; 2778 struct sock_xprt *transport; 2779 struct svc_sock *bc_sock; 2780 struct rpc_xprt *ret; 2781 2782 if (args->bc_xprt->xpt_bc_xprt) { 2783 /* 2784 * This server connection already has a backchannel 2785 * export; we can't create a new one, as we wouldn't be 2786 * able to match replies based on xid any more. So, 2787 * reuse the already-existing one: 2788 */ 2789 return args->bc_xprt->xpt_bc_xprt; 2790 } 2791 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2792 xprt_tcp_slot_table_entries); 2793 if (IS_ERR(xprt)) 2794 return xprt; 2795 transport = container_of(xprt, struct sock_xprt, xprt); 2796 2797 xprt->prot = IPPROTO_TCP; 2798 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2799 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2800 xprt->timeout = &xs_tcp_default_timeout; 2801 2802 /* backchannel */ 2803 xprt_set_bound(xprt); 2804 xprt->bind_timeout = 0; 2805 xprt->reestablish_timeout = 0; 2806 xprt->idle_timeout = 0; 2807 2808 xprt->ops = &bc_tcp_ops; 2809 2810 switch (addr->sa_family) { 2811 case AF_INET: 2812 xs_format_peer_addresses(xprt, "tcp", 2813 RPCBIND_NETID_TCP); 2814 break; 2815 case AF_INET6: 2816 xs_format_peer_addresses(xprt, "tcp", 2817 RPCBIND_NETID_TCP6); 2818 break; 2819 default: 2820 ret = ERR_PTR(-EAFNOSUPPORT); 2821 goto out_err; 2822 } 2823 2824 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2825 xprt->address_strings[RPC_DISPLAY_ADDR], 2826 xprt->address_strings[RPC_DISPLAY_PORT], 2827 xprt->address_strings[RPC_DISPLAY_PROTO]); 2828 2829 /* 2830 * Once we've associated a backchannel xprt with a connection, 2831 * we want to keep it around as long as long as the connection 2832 * lasts, in case we need to start using it for a backchannel 2833 * again; this reference won't be dropped until bc_xprt is 2834 * destroyed. 2835 */ 2836 xprt_get(xprt); 2837 args->bc_xprt->xpt_bc_xprt = xprt; 2838 xprt->bc_xprt = args->bc_xprt; 2839 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2840 transport->sock = bc_sock->sk_sock; 2841 transport->inet = bc_sock->sk_sk; 2842 2843 /* 2844 * Since we don't want connections for the backchannel, we set 2845 * the xprt status to connected 2846 */ 2847 xprt_set_connected(xprt); 2848 2849 2850 if (try_module_get(THIS_MODULE)) 2851 return xprt; 2852 xprt_put(xprt); 2853 ret = ERR_PTR(-EINVAL); 2854 out_err: 2855 xprt_free(xprt); 2856 return ret; 2857 } 2858 2859 static struct xprt_class xs_local_transport = { 2860 .list = LIST_HEAD_INIT(xs_local_transport.list), 2861 .name = "named UNIX socket", 2862 .owner = THIS_MODULE, 2863 .ident = XPRT_TRANSPORT_LOCAL, 2864 .setup = xs_setup_local, 2865 }; 2866 2867 static struct xprt_class xs_udp_transport = { 2868 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2869 .name = "udp", 2870 .owner = THIS_MODULE, 2871 .ident = XPRT_TRANSPORT_UDP, 2872 .setup = xs_setup_udp, 2873 }; 2874 2875 static struct xprt_class xs_tcp_transport = { 2876 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2877 .name = "tcp", 2878 .owner = THIS_MODULE, 2879 .ident = XPRT_TRANSPORT_TCP, 2880 .setup = xs_setup_tcp, 2881 }; 2882 2883 static struct xprt_class xs_bc_tcp_transport = { 2884 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2885 .name = "tcp NFSv4.1 backchannel", 2886 .owner = THIS_MODULE, 2887 .ident = XPRT_TRANSPORT_BC_TCP, 2888 .setup = xs_setup_bc_tcp, 2889 }; 2890 2891 /** 2892 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2893 * 2894 */ 2895 int init_socket_xprt(void) 2896 { 2897 #ifdef RPC_DEBUG 2898 if (!sunrpc_table_header) 2899 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2900 #endif 2901 2902 xprt_register_transport(&xs_local_transport); 2903 xprt_register_transport(&xs_udp_transport); 2904 xprt_register_transport(&xs_tcp_transport); 2905 xprt_register_transport(&xs_bc_tcp_transport); 2906 2907 return 0; 2908 } 2909 2910 /** 2911 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2912 * 2913 */ 2914 void cleanup_socket_xprt(void) 2915 { 2916 #ifdef RPC_DEBUG 2917 if (sunrpc_table_header) { 2918 unregister_sysctl_table(sunrpc_table_header); 2919 sunrpc_table_header = NULL; 2920 } 2921 #endif 2922 2923 xprt_unregister_transport(&xs_local_transport); 2924 xprt_unregister_transport(&xs_udp_transport); 2925 xprt_unregister_transport(&xs_tcp_transport); 2926 xprt_unregister_transport(&xs_bc_tcp_transport); 2927 } 2928 2929 static int param_set_uint_minmax(const char *val, 2930 const struct kernel_param *kp, 2931 unsigned int min, unsigned int max) 2932 { 2933 unsigned long num; 2934 int ret; 2935 2936 if (!val) 2937 return -EINVAL; 2938 ret = strict_strtoul(val, 0, &num); 2939 if (ret == -EINVAL || num < min || num > max) 2940 return -EINVAL; 2941 *((unsigned int *)kp->arg) = num; 2942 return 0; 2943 } 2944 2945 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2946 { 2947 return param_set_uint_minmax(val, kp, 2948 RPC_MIN_RESVPORT, 2949 RPC_MAX_RESVPORT); 2950 } 2951 2952 static struct kernel_param_ops param_ops_portnr = { 2953 .set = param_set_portnr, 2954 .get = param_get_uint, 2955 }; 2956 2957 #define param_check_portnr(name, p) \ 2958 __param_check(name, p, unsigned int); 2959 2960 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 2961 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 2962 2963 static int param_set_slot_table_size(const char *val, 2964 const struct kernel_param *kp) 2965 { 2966 return param_set_uint_minmax(val, kp, 2967 RPC_MIN_SLOT_TABLE, 2968 RPC_MAX_SLOT_TABLE); 2969 } 2970 2971 static struct kernel_param_ops param_ops_slot_table_size = { 2972 .set = param_set_slot_table_size, 2973 .get = param_get_uint, 2974 }; 2975 2976 #define param_check_slot_table_size(name, p) \ 2977 __param_check(name, p, unsigned int); 2978 2979 static int param_set_max_slot_table_size(const char *val, 2980 const struct kernel_param *kp) 2981 { 2982 return param_set_uint_minmax(val, kp, 2983 RPC_MIN_SLOT_TABLE, 2984 RPC_MAX_SLOT_TABLE_LIMIT); 2985 } 2986 2987 static struct kernel_param_ops param_ops_max_slot_table_size = { 2988 .set = param_set_max_slot_table_size, 2989 .get = param_get_uint, 2990 }; 2991 2992 #define param_check_max_slot_table_size(name, p) \ 2993 __param_check(name, p, unsigned int); 2994 2995 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 2996 slot_table_size, 0644); 2997 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 2998 max_slot_table_size, 0644); 2999 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3000 slot_table_size, 0644); 3001 3002