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 }; 258 259 /* 260 * TCP receive state flags 261 */ 262 #define TCP_RCV_LAST_FRAG (1UL << 0) 263 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 264 #define TCP_RCV_COPY_XID (1UL << 2) 265 #define TCP_RCV_COPY_DATA (1UL << 3) 266 #define TCP_RCV_READ_CALLDIR (1UL << 4) 267 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 268 269 /* 270 * TCP RPC flags 271 */ 272 #define TCP_RPC_REPLY (1UL << 6) 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_un *xs_addr_un(struct rpc_xprt *xprt) 280 { 281 return (struct sockaddr_un *) &xprt->addr; 282 } 283 284 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 285 { 286 return (struct sockaddr_in *) &xprt->addr; 287 } 288 289 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 290 { 291 return (struct sockaddr_in6 *) &xprt->addr; 292 } 293 294 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 295 { 296 struct sockaddr *sap = xs_addr(xprt); 297 struct sockaddr_in6 *sin6; 298 struct sockaddr_in *sin; 299 struct sockaddr_un *sun; 300 char buf[128]; 301 302 switch (sap->sa_family) { 303 case AF_LOCAL: 304 sun = xs_addr_un(xprt); 305 strlcpy(buf, sun->sun_path, sizeof(buf)); 306 xprt->address_strings[RPC_DISPLAY_ADDR] = 307 kstrdup(buf, GFP_KERNEL); 308 break; 309 case AF_INET: 310 (void)rpc_ntop(sap, buf, sizeof(buf)); 311 xprt->address_strings[RPC_DISPLAY_ADDR] = 312 kstrdup(buf, GFP_KERNEL); 313 sin = xs_addr_in(xprt); 314 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 315 break; 316 case AF_INET6: 317 (void)rpc_ntop(sap, buf, sizeof(buf)); 318 xprt->address_strings[RPC_DISPLAY_ADDR] = 319 kstrdup(buf, GFP_KERNEL); 320 sin6 = xs_addr_in6(xprt); 321 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 322 break; 323 default: 324 BUG(); 325 } 326 327 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 328 } 329 330 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 331 { 332 struct sockaddr *sap = xs_addr(xprt); 333 char buf[128]; 334 335 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 336 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 337 338 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 339 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 340 } 341 342 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 343 const char *protocol, 344 const char *netid) 345 { 346 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 347 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 348 xs_format_common_peer_addresses(xprt); 349 xs_format_common_peer_ports(xprt); 350 } 351 352 static void xs_update_peer_port(struct rpc_xprt *xprt) 353 { 354 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 355 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 356 357 xs_format_common_peer_ports(xprt); 358 } 359 360 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 361 { 362 unsigned int i; 363 364 for (i = 0; i < RPC_DISPLAY_MAX; i++) 365 switch (i) { 366 case RPC_DISPLAY_PROTO: 367 case RPC_DISPLAY_NETID: 368 continue; 369 default: 370 kfree(xprt->address_strings[i]); 371 } 372 } 373 374 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 375 376 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 377 { 378 struct msghdr msg = { 379 .msg_name = addr, 380 .msg_namelen = addrlen, 381 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 382 }; 383 struct kvec iov = { 384 .iov_base = vec->iov_base + base, 385 .iov_len = vec->iov_len - base, 386 }; 387 388 if (iov.iov_len != 0) 389 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 390 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 391 } 392 393 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 394 { 395 struct page **ppage; 396 unsigned int remainder; 397 int err, sent = 0; 398 399 remainder = xdr->page_len - base; 400 base += xdr->page_base; 401 ppage = xdr->pages + (base >> PAGE_SHIFT); 402 base &= ~PAGE_MASK; 403 for(;;) { 404 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 405 int flags = XS_SENDMSG_FLAGS; 406 407 remainder -= len; 408 if (remainder != 0 || more) 409 flags |= MSG_MORE; 410 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 411 if (remainder == 0 || err != len) 412 break; 413 sent += err; 414 ppage++; 415 base = 0; 416 } 417 if (sent == 0) 418 return err; 419 if (err > 0) 420 sent += err; 421 return sent; 422 } 423 424 /** 425 * xs_sendpages - write pages directly to a socket 426 * @sock: socket to send on 427 * @addr: UDP only -- address of destination 428 * @addrlen: UDP only -- length of destination address 429 * @xdr: buffer containing this request 430 * @base: starting position in the buffer 431 * 432 */ 433 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 434 { 435 unsigned int remainder = xdr->len - base; 436 int err, sent = 0; 437 438 if (unlikely(!sock)) 439 return -ENOTSOCK; 440 441 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 442 if (base != 0) { 443 addr = NULL; 444 addrlen = 0; 445 } 446 447 if (base < xdr->head[0].iov_len || addr != NULL) { 448 unsigned int len = xdr->head[0].iov_len - base; 449 remainder -= len; 450 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 451 if (remainder == 0 || err != len) 452 goto out; 453 sent += err; 454 base = 0; 455 } else 456 base -= xdr->head[0].iov_len; 457 458 if (base < xdr->page_len) { 459 unsigned int len = xdr->page_len - base; 460 remainder -= len; 461 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 462 if (remainder == 0 || err != len) 463 goto out; 464 sent += err; 465 base = 0; 466 } else 467 base -= xdr->page_len; 468 469 if (base >= xdr->tail[0].iov_len) 470 return sent; 471 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 472 out: 473 if (sent == 0) 474 return err; 475 if (err > 0) 476 sent += err; 477 return sent; 478 } 479 480 static void xs_nospace_callback(struct rpc_task *task) 481 { 482 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 483 484 transport->inet->sk_write_pending--; 485 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 486 } 487 488 /** 489 * xs_nospace - place task on wait queue if transmit was incomplete 490 * @task: task to put to sleep 491 * 492 */ 493 static int xs_nospace(struct rpc_task *task) 494 { 495 struct rpc_rqst *req = task->tk_rqstp; 496 struct rpc_xprt *xprt = req->rq_xprt; 497 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 498 int ret = -EAGAIN; 499 500 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 501 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 502 req->rq_slen); 503 504 /* Protect against races with write_space */ 505 spin_lock_bh(&xprt->transport_lock); 506 507 /* Don't race with disconnect */ 508 if (xprt_connected(xprt)) { 509 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 510 /* 511 * Notify TCP that we're limited by the application 512 * window size 513 */ 514 set_bit(SOCK_NOSPACE, &transport->sock->flags); 515 transport->inet->sk_write_pending++; 516 /* ...and wait for more buffer space */ 517 xprt_wait_for_buffer_space(task, xs_nospace_callback); 518 } 519 } else { 520 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 521 ret = -ENOTCONN; 522 } 523 524 spin_unlock_bh(&xprt->transport_lock); 525 return ret; 526 } 527 528 /* 529 * Construct a stream transport record marker in @buf. 530 */ 531 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 532 { 533 u32 reclen = buf->len - sizeof(rpc_fraghdr); 534 rpc_fraghdr *base = buf->head[0].iov_base; 535 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 536 } 537 538 /** 539 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 540 * @task: RPC task that manages the state of an RPC request 541 * 542 * Return values: 543 * 0: The request has been sent 544 * EAGAIN: The socket was blocked, please call again later to 545 * complete the request 546 * ENOTCONN: Caller needs to invoke connect logic then call again 547 * other: Some other error occured, the request was not sent 548 */ 549 static int xs_local_send_request(struct rpc_task *task) 550 { 551 struct rpc_rqst *req = task->tk_rqstp; 552 struct rpc_xprt *xprt = req->rq_xprt; 553 struct sock_xprt *transport = 554 container_of(xprt, struct sock_xprt, xprt); 555 struct xdr_buf *xdr = &req->rq_snd_buf; 556 int status; 557 558 xs_encode_stream_record_marker(&req->rq_snd_buf); 559 560 xs_pktdump("packet data:", 561 req->rq_svec->iov_base, req->rq_svec->iov_len); 562 563 status = xs_sendpages(transport->sock, NULL, 0, 564 xdr, req->rq_bytes_sent); 565 dprintk("RPC: %s(%u) = %d\n", 566 __func__, xdr->len - req->rq_bytes_sent, status); 567 if (likely(status >= 0)) { 568 req->rq_bytes_sent += status; 569 req->rq_xmit_bytes_sent += status; 570 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 571 req->rq_bytes_sent = 0; 572 return 0; 573 } 574 status = -EAGAIN; 575 } 576 577 switch (status) { 578 case -EAGAIN: 579 status = xs_nospace(task); 580 break; 581 default: 582 dprintk("RPC: sendmsg returned unrecognized error %d\n", 583 -status); 584 case -EPIPE: 585 xs_close(xprt); 586 status = -ENOTCONN; 587 } 588 589 return status; 590 } 591 592 /** 593 * xs_udp_send_request - write an RPC request to a UDP socket 594 * @task: address of RPC task that manages the state of an RPC request 595 * 596 * Return values: 597 * 0: The request has been sent 598 * EAGAIN: The socket was blocked, please call again later to 599 * complete the request 600 * ENOTCONN: Caller needs to invoke connect logic then call again 601 * other: Some other error occurred, the request was not sent 602 */ 603 static int xs_udp_send_request(struct rpc_task *task) 604 { 605 struct rpc_rqst *req = task->tk_rqstp; 606 struct rpc_xprt *xprt = req->rq_xprt; 607 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 608 struct xdr_buf *xdr = &req->rq_snd_buf; 609 int status; 610 611 xs_pktdump("packet data:", 612 req->rq_svec->iov_base, 613 req->rq_svec->iov_len); 614 615 if (!xprt_bound(xprt)) 616 return -ENOTCONN; 617 status = xs_sendpages(transport->sock, 618 xs_addr(xprt), 619 xprt->addrlen, xdr, 620 req->rq_bytes_sent); 621 622 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 623 xdr->len - req->rq_bytes_sent, status); 624 625 if (status >= 0) { 626 req->rq_xmit_bytes_sent += status; 627 if (status >= req->rq_slen) 628 return 0; 629 /* Still some bytes left; set up for a retry later. */ 630 status = -EAGAIN; 631 } 632 633 switch (status) { 634 case -ENOTSOCK: 635 status = -ENOTCONN; 636 /* Should we call xs_close() here? */ 637 break; 638 case -EAGAIN: 639 status = xs_nospace(task); 640 break; 641 default: 642 dprintk("RPC: sendmsg returned unrecognized error %d\n", 643 -status); 644 case -ENETUNREACH: 645 case -EPIPE: 646 case -ECONNREFUSED: 647 /* When the server has died, an ICMP port unreachable message 648 * prompts ECONNREFUSED. */ 649 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 650 } 651 652 return status; 653 } 654 655 /** 656 * xs_tcp_shutdown - gracefully shut down a TCP socket 657 * @xprt: transport 658 * 659 * Initiates a graceful shutdown of the TCP socket by calling the 660 * equivalent of shutdown(SHUT_WR); 661 */ 662 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 663 { 664 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 665 struct socket *sock = transport->sock; 666 667 if (sock != NULL) 668 kernel_sock_shutdown(sock, SHUT_WR); 669 } 670 671 /** 672 * xs_tcp_send_request - write an RPC request to a TCP socket 673 * @task: address of RPC task that manages the state of an RPC request 674 * 675 * Return values: 676 * 0: The request has been sent 677 * EAGAIN: The socket was blocked, please call again later to 678 * complete the request 679 * ENOTCONN: Caller needs to invoke connect logic then call again 680 * other: Some other error occurred, the request was not sent 681 * 682 * XXX: In the case of soft timeouts, should we eventually give up 683 * if sendmsg is not able to make progress? 684 */ 685 static int xs_tcp_send_request(struct rpc_task *task) 686 { 687 struct rpc_rqst *req = task->tk_rqstp; 688 struct rpc_xprt *xprt = req->rq_xprt; 689 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 690 struct xdr_buf *xdr = &req->rq_snd_buf; 691 int status; 692 693 xs_encode_stream_record_marker(&req->rq_snd_buf); 694 695 xs_pktdump("packet data:", 696 req->rq_svec->iov_base, 697 req->rq_svec->iov_len); 698 699 /* Continue transmitting the packet/record. We must be careful 700 * to cope with writespace callbacks arriving _after_ we have 701 * called sendmsg(). */ 702 while (1) { 703 status = xs_sendpages(transport->sock, 704 NULL, 0, xdr, req->rq_bytes_sent); 705 706 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 707 xdr->len - req->rq_bytes_sent, status); 708 709 if (unlikely(status < 0)) 710 break; 711 712 /* If we've sent the entire packet, immediately 713 * reset the count of bytes sent. */ 714 req->rq_bytes_sent += status; 715 req->rq_xmit_bytes_sent += status; 716 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 717 req->rq_bytes_sent = 0; 718 return 0; 719 } 720 721 if (status != 0) 722 continue; 723 status = -EAGAIN; 724 break; 725 } 726 727 switch (status) { 728 case -ENOTSOCK: 729 status = -ENOTCONN; 730 /* Should we call xs_close() here? */ 731 break; 732 case -EAGAIN: 733 status = xs_nospace(task); 734 break; 735 default: 736 dprintk("RPC: sendmsg returned unrecognized error %d\n", 737 -status); 738 case -ECONNRESET: 739 xs_tcp_shutdown(xprt); 740 case -ECONNREFUSED: 741 case -ENOTCONN: 742 case -EPIPE: 743 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 744 } 745 746 return status; 747 } 748 749 /** 750 * xs_tcp_release_xprt - clean up after a tcp transmission 751 * @xprt: transport 752 * @task: rpc task 753 * 754 * This cleans up if an error causes us to abort the transmission of a request. 755 * In this case, the socket may need to be reset in order to avoid confusing 756 * the server. 757 */ 758 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 759 { 760 struct rpc_rqst *req; 761 762 if (task != xprt->snd_task) 763 return; 764 if (task == NULL) 765 goto out_release; 766 req = task->tk_rqstp; 767 if (req == NULL) 768 goto out_release; 769 if (req->rq_bytes_sent == 0) 770 goto out_release; 771 if (req->rq_bytes_sent == req->rq_snd_buf.len) 772 goto out_release; 773 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 774 out_release: 775 xprt_release_xprt(xprt, task); 776 } 777 778 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 779 { 780 transport->old_data_ready = sk->sk_data_ready; 781 transport->old_state_change = sk->sk_state_change; 782 transport->old_write_space = sk->sk_write_space; 783 } 784 785 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 786 { 787 sk->sk_data_ready = transport->old_data_ready; 788 sk->sk_state_change = transport->old_state_change; 789 sk->sk_write_space = transport->old_write_space; 790 } 791 792 static void xs_reset_transport(struct sock_xprt *transport) 793 { 794 struct socket *sock = transport->sock; 795 struct sock *sk = transport->inet; 796 797 if (sk == NULL) 798 return; 799 800 transport->srcport = 0; 801 802 write_lock_bh(&sk->sk_callback_lock); 803 transport->inet = NULL; 804 transport->sock = NULL; 805 806 sk->sk_user_data = NULL; 807 808 xs_restore_old_callbacks(transport, sk); 809 write_unlock_bh(&sk->sk_callback_lock); 810 811 sk->sk_no_check = 0; 812 813 sock_release(sock); 814 } 815 816 /** 817 * xs_close - close a socket 818 * @xprt: transport 819 * 820 * This is used when all requests are complete; ie, no DRC state remains 821 * on the server we want to save. 822 * 823 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 824 * xs_reset_transport() zeroing the socket from underneath a writer. 825 */ 826 static void xs_close(struct rpc_xprt *xprt) 827 { 828 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 829 830 dprintk("RPC: xs_close xprt %p\n", xprt); 831 832 xs_reset_transport(transport); 833 xprt->reestablish_timeout = 0; 834 835 smp_mb__before_clear_bit(); 836 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 837 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 838 clear_bit(XPRT_CLOSING, &xprt->state); 839 smp_mb__after_clear_bit(); 840 xprt_disconnect_done(xprt); 841 } 842 843 static void xs_tcp_close(struct rpc_xprt *xprt) 844 { 845 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 846 xs_close(xprt); 847 else 848 xs_tcp_shutdown(xprt); 849 } 850 851 /** 852 * xs_destroy - prepare to shutdown a transport 853 * @xprt: doomed transport 854 * 855 */ 856 static void xs_destroy(struct rpc_xprt *xprt) 857 { 858 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 859 860 dprintk("RPC: xs_destroy xprt %p\n", xprt); 861 862 cancel_delayed_work_sync(&transport->connect_worker); 863 864 xs_close(xprt); 865 xs_free_peer_addresses(xprt); 866 xprt_free(xprt); 867 module_put(THIS_MODULE); 868 } 869 870 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 871 { 872 return (struct rpc_xprt *) sk->sk_user_data; 873 } 874 875 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 876 { 877 struct xdr_skb_reader desc = { 878 .skb = skb, 879 .offset = sizeof(rpc_fraghdr), 880 .count = skb->len - sizeof(rpc_fraghdr), 881 }; 882 883 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 884 return -1; 885 if (desc.count) 886 return -1; 887 return 0; 888 } 889 890 /** 891 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 892 * @sk: socket with data to read 893 * @len: how much data to read 894 * 895 * Currently this assumes we can read the whole reply in a single gulp. 896 */ 897 static void xs_local_data_ready(struct sock *sk, int len) 898 { 899 struct rpc_task *task; 900 struct rpc_xprt *xprt; 901 struct rpc_rqst *rovr; 902 struct sk_buff *skb; 903 int err, repsize, copied; 904 u32 _xid; 905 __be32 *xp; 906 907 read_lock_bh(&sk->sk_callback_lock); 908 dprintk("RPC: %s...\n", __func__); 909 xprt = xprt_from_sock(sk); 910 if (xprt == NULL) 911 goto out; 912 913 skb = skb_recv_datagram(sk, 0, 1, &err); 914 if (skb == NULL) 915 goto out; 916 917 repsize = skb->len - sizeof(rpc_fraghdr); 918 if (repsize < 4) { 919 dprintk("RPC: impossible RPC reply size %d\n", repsize); 920 goto dropit; 921 } 922 923 /* Copy the XID from the skb... */ 924 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 925 if (xp == NULL) 926 goto dropit; 927 928 /* Look up and lock the request corresponding to the given XID */ 929 spin_lock(&xprt->transport_lock); 930 rovr = xprt_lookup_rqst(xprt, *xp); 931 if (!rovr) 932 goto out_unlock; 933 task = rovr->rq_task; 934 935 copied = rovr->rq_private_buf.buflen; 936 if (copied > repsize) 937 copied = repsize; 938 939 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 940 dprintk("RPC: sk_buff copy failed\n"); 941 goto out_unlock; 942 } 943 944 xprt_complete_rqst(task, copied); 945 946 out_unlock: 947 spin_unlock(&xprt->transport_lock); 948 dropit: 949 skb_free_datagram(sk, skb); 950 out: 951 read_unlock_bh(&sk->sk_callback_lock); 952 } 953 954 /** 955 * xs_udp_data_ready - "data ready" callback for UDP sockets 956 * @sk: socket with data to read 957 * @len: how much data to read 958 * 959 */ 960 static void xs_udp_data_ready(struct sock *sk, int len) 961 { 962 struct rpc_task *task; 963 struct rpc_xprt *xprt; 964 struct rpc_rqst *rovr; 965 struct sk_buff *skb; 966 int err, repsize, copied; 967 u32 _xid; 968 __be32 *xp; 969 970 read_lock_bh(&sk->sk_callback_lock); 971 dprintk("RPC: xs_udp_data_ready...\n"); 972 if (!(xprt = xprt_from_sock(sk))) 973 goto out; 974 975 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 976 goto out; 977 978 repsize = skb->len - sizeof(struct udphdr); 979 if (repsize < 4) { 980 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 981 goto dropit; 982 } 983 984 /* Copy the XID from the skb... */ 985 xp = skb_header_pointer(skb, sizeof(struct udphdr), 986 sizeof(_xid), &_xid); 987 if (xp == NULL) 988 goto dropit; 989 990 /* Look up and lock the request corresponding to the given XID */ 991 spin_lock(&xprt->transport_lock); 992 rovr = xprt_lookup_rqst(xprt, *xp); 993 if (!rovr) 994 goto out_unlock; 995 task = rovr->rq_task; 996 997 if ((copied = rovr->rq_private_buf.buflen) > repsize) 998 copied = repsize; 999 1000 /* Suck it into the iovec, verify checksum if not done by hw. */ 1001 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1002 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1003 goto out_unlock; 1004 } 1005 1006 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1007 1008 xprt_adjust_cwnd(task, copied); 1009 xprt_complete_rqst(task, copied); 1010 1011 out_unlock: 1012 spin_unlock(&xprt->transport_lock); 1013 dropit: 1014 skb_free_datagram(sk, skb); 1015 out: 1016 read_unlock_bh(&sk->sk_callback_lock); 1017 } 1018 1019 /* 1020 * Helper function to force a TCP close if the server is sending 1021 * junk and/or it has put us in CLOSE_WAIT 1022 */ 1023 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1024 { 1025 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1026 xprt_force_disconnect(xprt); 1027 } 1028 1029 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1030 { 1031 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1032 size_t len, used; 1033 char *p; 1034 1035 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1036 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1037 used = xdr_skb_read_bits(desc, p, len); 1038 transport->tcp_offset += used; 1039 if (used != len) 1040 return; 1041 1042 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1043 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1044 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1045 else 1046 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1047 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1048 1049 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1050 transport->tcp_offset = 0; 1051 1052 /* Sanity check of the record length */ 1053 if (unlikely(transport->tcp_reclen < 8)) { 1054 dprintk("RPC: invalid TCP record fragment length\n"); 1055 xs_tcp_force_close(xprt); 1056 return; 1057 } 1058 dprintk("RPC: reading TCP record fragment of length %d\n", 1059 transport->tcp_reclen); 1060 } 1061 1062 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1063 { 1064 if (transport->tcp_offset == transport->tcp_reclen) { 1065 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1066 transport->tcp_offset = 0; 1067 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1068 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1069 transport->tcp_flags |= TCP_RCV_COPY_XID; 1070 transport->tcp_copied = 0; 1071 } 1072 } 1073 } 1074 1075 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1076 { 1077 size_t len, used; 1078 char *p; 1079 1080 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1081 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1082 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1083 used = xdr_skb_read_bits(desc, p, len); 1084 transport->tcp_offset += used; 1085 if (used != len) 1086 return; 1087 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1088 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1089 transport->tcp_copied = 4; 1090 dprintk("RPC: reading %s XID %08x\n", 1091 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1092 : "request with", 1093 ntohl(transport->tcp_xid)); 1094 xs_tcp_check_fraghdr(transport); 1095 } 1096 1097 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1098 struct xdr_skb_reader *desc) 1099 { 1100 size_t len, used; 1101 u32 offset; 1102 char *p; 1103 1104 /* 1105 * We want transport->tcp_offset to be 8 at the end of this routine 1106 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1107 * When this function is called for the first time, 1108 * transport->tcp_offset is 4 (after having already read the xid). 1109 */ 1110 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1111 len = sizeof(transport->tcp_calldir) - offset; 1112 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1113 p = ((char *) &transport->tcp_calldir) + offset; 1114 used = xdr_skb_read_bits(desc, p, len); 1115 transport->tcp_offset += used; 1116 if (used != len) 1117 return; 1118 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1119 /* 1120 * We don't yet have the XDR buffer, so we will write the calldir 1121 * out after we get the buffer from the 'struct rpc_rqst' 1122 */ 1123 switch (ntohl(transport->tcp_calldir)) { 1124 case RPC_REPLY: 1125 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1126 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1127 transport->tcp_flags |= TCP_RPC_REPLY; 1128 break; 1129 case RPC_CALL: 1130 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1131 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1132 transport->tcp_flags &= ~TCP_RPC_REPLY; 1133 break; 1134 default: 1135 dprintk("RPC: invalid request message type\n"); 1136 xs_tcp_force_close(&transport->xprt); 1137 } 1138 xs_tcp_check_fraghdr(transport); 1139 } 1140 1141 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1142 struct xdr_skb_reader *desc, 1143 struct rpc_rqst *req) 1144 { 1145 struct sock_xprt *transport = 1146 container_of(xprt, struct sock_xprt, xprt); 1147 struct xdr_buf *rcvbuf; 1148 size_t len; 1149 ssize_t r; 1150 1151 rcvbuf = &req->rq_private_buf; 1152 1153 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1154 /* 1155 * Save the RPC direction in the XDR buffer 1156 */ 1157 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1158 &transport->tcp_calldir, 1159 sizeof(transport->tcp_calldir)); 1160 transport->tcp_copied += sizeof(transport->tcp_calldir); 1161 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1162 } 1163 1164 len = desc->count; 1165 if (len > transport->tcp_reclen - transport->tcp_offset) { 1166 struct xdr_skb_reader my_desc; 1167 1168 len = transport->tcp_reclen - transport->tcp_offset; 1169 memcpy(&my_desc, desc, sizeof(my_desc)); 1170 my_desc.count = len; 1171 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1172 &my_desc, xdr_skb_read_bits); 1173 desc->count -= r; 1174 desc->offset += r; 1175 } else 1176 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1177 desc, xdr_skb_read_bits); 1178 1179 if (r > 0) { 1180 transport->tcp_copied += r; 1181 transport->tcp_offset += r; 1182 } 1183 if (r != len) { 1184 /* Error when copying to the receive buffer, 1185 * usually because we weren't able to allocate 1186 * additional buffer pages. All we can do now 1187 * is turn off TCP_RCV_COPY_DATA, so the request 1188 * will not receive any additional updates, 1189 * and time out. 1190 * Any remaining data from this record will 1191 * be discarded. 1192 */ 1193 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1194 dprintk("RPC: XID %08x truncated request\n", 1195 ntohl(transport->tcp_xid)); 1196 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1197 "tcp_offset = %u, tcp_reclen = %u\n", 1198 xprt, transport->tcp_copied, 1199 transport->tcp_offset, transport->tcp_reclen); 1200 return; 1201 } 1202 1203 dprintk("RPC: XID %08x read %Zd bytes\n", 1204 ntohl(transport->tcp_xid), r); 1205 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1206 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1207 transport->tcp_offset, transport->tcp_reclen); 1208 1209 if (transport->tcp_copied == req->rq_private_buf.buflen) 1210 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1211 else if (transport->tcp_offset == transport->tcp_reclen) { 1212 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1214 } 1215 } 1216 1217 /* 1218 * Finds the request corresponding to the RPC xid and invokes the common 1219 * tcp read code to read the data. 1220 */ 1221 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1222 struct xdr_skb_reader *desc) 1223 { 1224 struct sock_xprt *transport = 1225 container_of(xprt, struct sock_xprt, xprt); 1226 struct rpc_rqst *req; 1227 1228 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1229 1230 /* Find and lock the request corresponding to this xid */ 1231 spin_lock(&xprt->transport_lock); 1232 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1233 if (!req) { 1234 dprintk("RPC: XID %08x request not found!\n", 1235 ntohl(transport->tcp_xid)); 1236 spin_unlock(&xprt->transport_lock); 1237 return -1; 1238 } 1239 1240 xs_tcp_read_common(xprt, desc, req); 1241 1242 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1243 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1244 1245 spin_unlock(&xprt->transport_lock); 1246 return 0; 1247 } 1248 1249 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1250 /* 1251 * Obtains an rpc_rqst previously allocated and invokes the common 1252 * tcp read code to read the data. The result is placed in the callback 1253 * queue. 1254 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1255 * connection and return -1. 1256 */ 1257 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1258 struct xdr_skb_reader *desc) 1259 { 1260 struct sock_xprt *transport = 1261 container_of(xprt, struct sock_xprt, xprt); 1262 struct rpc_rqst *req; 1263 1264 req = xprt_alloc_bc_request(xprt); 1265 if (req == NULL) { 1266 printk(KERN_WARNING "Callback slot table overflowed\n"); 1267 xprt_force_disconnect(xprt); 1268 return -1; 1269 } 1270 1271 req->rq_xid = transport->tcp_xid; 1272 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1273 xs_tcp_read_common(xprt, desc, req); 1274 1275 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1276 struct svc_serv *bc_serv = xprt->bc_serv; 1277 1278 /* 1279 * Add callback request to callback list. The callback 1280 * service sleeps on the sv_cb_waitq waiting for new 1281 * requests. Wake it up after adding enqueing the 1282 * request. 1283 */ 1284 dprintk("RPC: add callback request to list\n"); 1285 spin_lock(&bc_serv->sv_cb_lock); 1286 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1287 spin_unlock(&bc_serv->sv_cb_lock); 1288 wake_up(&bc_serv->sv_cb_waitq); 1289 } 1290 1291 req->rq_private_buf.len = transport->tcp_copied; 1292 1293 return 0; 1294 } 1295 1296 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1297 struct xdr_skb_reader *desc) 1298 { 1299 struct sock_xprt *transport = 1300 container_of(xprt, struct sock_xprt, xprt); 1301 1302 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1303 xs_tcp_read_reply(xprt, desc) : 1304 xs_tcp_read_callback(xprt, desc); 1305 } 1306 #else 1307 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1308 struct xdr_skb_reader *desc) 1309 { 1310 return xs_tcp_read_reply(xprt, desc); 1311 } 1312 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1313 1314 /* 1315 * Read data off the transport. This can be either an RPC_CALL or an 1316 * RPC_REPLY. Relay the processing to helper functions. 1317 */ 1318 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1319 struct xdr_skb_reader *desc) 1320 { 1321 struct sock_xprt *transport = 1322 container_of(xprt, struct sock_xprt, xprt); 1323 1324 if (_xs_tcp_read_data(xprt, desc) == 0) 1325 xs_tcp_check_fraghdr(transport); 1326 else { 1327 /* 1328 * The transport_lock protects the request handling. 1329 * There's no need to hold it to update the tcp_flags. 1330 */ 1331 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1332 } 1333 } 1334 1335 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1336 { 1337 size_t len; 1338 1339 len = transport->tcp_reclen - transport->tcp_offset; 1340 if (len > desc->count) 1341 len = desc->count; 1342 desc->count -= len; 1343 desc->offset += len; 1344 transport->tcp_offset += len; 1345 dprintk("RPC: discarded %Zu bytes\n", len); 1346 xs_tcp_check_fraghdr(transport); 1347 } 1348 1349 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1350 { 1351 struct rpc_xprt *xprt = rd_desc->arg.data; 1352 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1353 struct xdr_skb_reader desc = { 1354 .skb = skb, 1355 .offset = offset, 1356 .count = len, 1357 }; 1358 1359 dprintk("RPC: xs_tcp_data_recv started\n"); 1360 do { 1361 /* Read in a new fragment marker if necessary */ 1362 /* Can we ever really expect to get completely empty fragments? */ 1363 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1364 xs_tcp_read_fraghdr(xprt, &desc); 1365 continue; 1366 } 1367 /* Read in the xid if necessary */ 1368 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1369 xs_tcp_read_xid(transport, &desc); 1370 continue; 1371 } 1372 /* Read in the call/reply flag */ 1373 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1374 xs_tcp_read_calldir(transport, &desc); 1375 continue; 1376 } 1377 /* Read in the request data */ 1378 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1379 xs_tcp_read_data(xprt, &desc); 1380 continue; 1381 } 1382 /* Skip over any trailing bytes on short reads */ 1383 xs_tcp_read_discard(transport, &desc); 1384 } while (desc.count); 1385 dprintk("RPC: xs_tcp_data_recv done\n"); 1386 return len - desc.count; 1387 } 1388 1389 /** 1390 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1391 * @sk: socket with data to read 1392 * @bytes: how much data to read 1393 * 1394 */ 1395 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1396 { 1397 struct rpc_xprt *xprt; 1398 read_descriptor_t rd_desc; 1399 int read; 1400 1401 dprintk("RPC: xs_tcp_data_ready...\n"); 1402 1403 read_lock_bh(&sk->sk_callback_lock); 1404 if (!(xprt = xprt_from_sock(sk))) 1405 goto out; 1406 /* Any data means we had a useful conversation, so 1407 * the we don't need to delay the next reconnect 1408 */ 1409 if (xprt->reestablish_timeout) 1410 xprt->reestablish_timeout = 0; 1411 1412 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1413 rd_desc.arg.data = xprt; 1414 do { 1415 rd_desc.count = 65536; 1416 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1417 } while (read > 0); 1418 out: 1419 read_unlock_bh(&sk->sk_callback_lock); 1420 } 1421 1422 /* 1423 * Do the equivalent of linger/linger2 handling for dealing with 1424 * broken servers that don't close the socket in a timely 1425 * fashion 1426 */ 1427 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1428 unsigned long timeout) 1429 { 1430 struct sock_xprt *transport; 1431 1432 if (xprt_test_and_set_connecting(xprt)) 1433 return; 1434 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1435 transport = container_of(xprt, struct sock_xprt, xprt); 1436 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1437 timeout); 1438 } 1439 1440 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1441 { 1442 struct sock_xprt *transport; 1443 1444 transport = container_of(xprt, struct sock_xprt, xprt); 1445 1446 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1447 !cancel_delayed_work(&transport->connect_worker)) 1448 return; 1449 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1450 xprt_clear_connecting(xprt); 1451 } 1452 1453 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1454 { 1455 smp_mb__before_clear_bit(); 1456 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1457 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1458 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1459 clear_bit(XPRT_CLOSING, &xprt->state); 1460 smp_mb__after_clear_bit(); 1461 } 1462 1463 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1464 { 1465 xs_sock_reset_connection_flags(xprt); 1466 /* Mark transport as closed and wake up all pending tasks */ 1467 xprt_disconnect_done(xprt); 1468 } 1469 1470 /** 1471 * xs_tcp_state_change - callback to handle TCP socket state changes 1472 * @sk: socket whose state has changed 1473 * 1474 */ 1475 static void xs_tcp_state_change(struct sock *sk) 1476 { 1477 struct rpc_xprt *xprt; 1478 1479 read_lock_bh(&sk->sk_callback_lock); 1480 if (!(xprt = xprt_from_sock(sk))) 1481 goto out; 1482 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1483 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1484 sk->sk_state, xprt_connected(xprt), 1485 sock_flag(sk, SOCK_DEAD), 1486 sock_flag(sk, SOCK_ZAPPED), 1487 sk->sk_shutdown); 1488 1489 switch (sk->sk_state) { 1490 case TCP_ESTABLISHED: 1491 spin_lock(&xprt->transport_lock); 1492 if (!xprt_test_and_set_connected(xprt)) { 1493 struct sock_xprt *transport = container_of(xprt, 1494 struct sock_xprt, xprt); 1495 1496 /* Reset TCP record info */ 1497 transport->tcp_offset = 0; 1498 transport->tcp_reclen = 0; 1499 transport->tcp_copied = 0; 1500 transport->tcp_flags = 1501 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1502 1503 xprt_wake_pending_tasks(xprt, -EAGAIN); 1504 } 1505 spin_unlock(&xprt->transport_lock); 1506 break; 1507 case TCP_FIN_WAIT1: 1508 /* The client initiated a shutdown of the socket */ 1509 xprt->connect_cookie++; 1510 xprt->reestablish_timeout = 0; 1511 set_bit(XPRT_CLOSING, &xprt->state); 1512 smp_mb__before_clear_bit(); 1513 clear_bit(XPRT_CONNECTED, &xprt->state); 1514 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1515 smp_mb__after_clear_bit(); 1516 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1517 break; 1518 case TCP_CLOSE_WAIT: 1519 /* The server initiated a shutdown of the socket */ 1520 xprt->connect_cookie++; 1521 clear_bit(XPRT_CONNECTED, &xprt->state); 1522 xs_tcp_force_close(xprt); 1523 case TCP_CLOSING: 1524 /* 1525 * If the server closed down the connection, make sure that 1526 * we back off before reconnecting 1527 */ 1528 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1529 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1530 break; 1531 case TCP_LAST_ACK: 1532 set_bit(XPRT_CLOSING, &xprt->state); 1533 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1534 smp_mb__before_clear_bit(); 1535 clear_bit(XPRT_CONNECTED, &xprt->state); 1536 smp_mb__after_clear_bit(); 1537 break; 1538 case TCP_CLOSE: 1539 xs_tcp_cancel_linger_timeout(xprt); 1540 xs_sock_mark_closed(xprt); 1541 } 1542 out: 1543 read_unlock_bh(&sk->sk_callback_lock); 1544 } 1545 1546 static void xs_write_space(struct sock *sk) 1547 { 1548 struct socket *sock; 1549 struct rpc_xprt *xprt; 1550 1551 if (unlikely(!(sock = sk->sk_socket))) 1552 return; 1553 clear_bit(SOCK_NOSPACE, &sock->flags); 1554 1555 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1556 return; 1557 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1558 return; 1559 1560 xprt_write_space(xprt); 1561 } 1562 1563 /** 1564 * xs_udp_write_space - callback invoked when socket buffer space 1565 * becomes available 1566 * @sk: socket whose state has changed 1567 * 1568 * Called when more output buffer space is available for this socket. 1569 * We try not to wake our writers until they can make "significant" 1570 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1571 * with a bunch of small requests. 1572 */ 1573 static void xs_udp_write_space(struct sock *sk) 1574 { 1575 read_lock_bh(&sk->sk_callback_lock); 1576 1577 /* from net/core/sock.c:sock_def_write_space */ 1578 if (sock_writeable(sk)) 1579 xs_write_space(sk); 1580 1581 read_unlock_bh(&sk->sk_callback_lock); 1582 } 1583 1584 /** 1585 * xs_tcp_write_space - callback invoked when socket buffer space 1586 * becomes available 1587 * @sk: socket whose state has changed 1588 * 1589 * Called when more output buffer space is available for this socket. 1590 * We try not to wake our writers until they can make "significant" 1591 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1592 * with a bunch of small requests. 1593 */ 1594 static void xs_tcp_write_space(struct sock *sk) 1595 { 1596 read_lock_bh(&sk->sk_callback_lock); 1597 1598 /* from net/core/stream.c:sk_stream_write_space */ 1599 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1600 xs_write_space(sk); 1601 1602 read_unlock_bh(&sk->sk_callback_lock); 1603 } 1604 1605 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1606 { 1607 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1608 struct sock *sk = transport->inet; 1609 1610 if (transport->rcvsize) { 1611 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1612 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1613 } 1614 if (transport->sndsize) { 1615 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1616 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1617 sk->sk_write_space(sk); 1618 } 1619 } 1620 1621 /** 1622 * xs_udp_set_buffer_size - set send and receive limits 1623 * @xprt: generic transport 1624 * @sndsize: requested size of send buffer, in bytes 1625 * @rcvsize: requested size of receive buffer, in bytes 1626 * 1627 * Set socket send and receive buffer size limits. 1628 */ 1629 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1630 { 1631 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1632 1633 transport->sndsize = 0; 1634 if (sndsize) 1635 transport->sndsize = sndsize + 1024; 1636 transport->rcvsize = 0; 1637 if (rcvsize) 1638 transport->rcvsize = rcvsize + 1024; 1639 1640 xs_udp_do_set_buffer_size(xprt); 1641 } 1642 1643 /** 1644 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1645 * @task: task that timed out 1646 * 1647 * Adjust the congestion window after a retransmit timeout has occurred. 1648 */ 1649 static void xs_udp_timer(struct rpc_task *task) 1650 { 1651 xprt_adjust_cwnd(task, -ETIMEDOUT); 1652 } 1653 1654 static unsigned short xs_get_random_port(void) 1655 { 1656 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1657 unsigned short rand = (unsigned short) net_random() % range; 1658 return rand + xprt_min_resvport; 1659 } 1660 1661 /** 1662 * xs_set_port - reset the port number in the remote endpoint address 1663 * @xprt: generic transport 1664 * @port: new port number 1665 * 1666 */ 1667 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1668 { 1669 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1670 1671 rpc_set_port(xs_addr(xprt), port); 1672 xs_update_peer_port(xprt); 1673 } 1674 1675 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1676 { 1677 unsigned short port = transport->srcport; 1678 1679 if (port == 0 && transport->xprt.resvport) 1680 port = xs_get_random_port(); 1681 return port; 1682 } 1683 1684 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1685 { 1686 if (transport->srcport != 0) 1687 transport->srcport = 0; 1688 if (!transport->xprt.resvport) 1689 return 0; 1690 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1691 return xprt_max_resvport; 1692 return --port; 1693 } 1694 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1695 { 1696 struct sockaddr_storage myaddr; 1697 int err, nloop = 0; 1698 unsigned short port = xs_get_srcport(transport); 1699 unsigned short last; 1700 1701 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1702 do { 1703 rpc_set_port((struct sockaddr *)&myaddr, port); 1704 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1705 transport->xprt.addrlen); 1706 if (port == 0) 1707 break; 1708 if (err == 0) { 1709 transport->srcport = port; 1710 break; 1711 } 1712 last = port; 1713 port = xs_next_srcport(transport, port); 1714 if (port > last) 1715 nloop++; 1716 } while (err == -EADDRINUSE && nloop != 2); 1717 1718 if (myaddr.ss_family == AF_INET) 1719 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1720 &((struct sockaddr_in *)&myaddr)->sin_addr, 1721 port, err ? "failed" : "ok", err); 1722 else 1723 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1724 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1725 port, err ? "failed" : "ok", err); 1726 return err; 1727 } 1728 1729 /* 1730 * We don't support autobind on AF_LOCAL sockets 1731 */ 1732 static void xs_local_rpcbind(struct rpc_task *task) 1733 { 1734 xprt_set_bound(task->tk_xprt); 1735 } 1736 1737 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1738 { 1739 } 1740 1741 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1742 static struct lock_class_key xs_key[2]; 1743 static struct lock_class_key xs_slock_key[2]; 1744 1745 static inline void xs_reclassify_socketu(struct socket *sock) 1746 { 1747 struct sock *sk = sock->sk; 1748 1749 BUG_ON(sock_owned_by_user(sk)); 1750 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1751 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1752 } 1753 1754 static inline void xs_reclassify_socket4(struct socket *sock) 1755 { 1756 struct sock *sk = sock->sk; 1757 1758 BUG_ON(sock_owned_by_user(sk)); 1759 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1760 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1761 } 1762 1763 static inline void xs_reclassify_socket6(struct socket *sock) 1764 { 1765 struct sock *sk = sock->sk; 1766 1767 BUG_ON(sock_owned_by_user(sk)); 1768 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1769 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1770 } 1771 1772 static inline void xs_reclassify_socket(int family, struct socket *sock) 1773 { 1774 switch (family) { 1775 case AF_LOCAL: 1776 xs_reclassify_socketu(sock); 1777 break; 1778 case AF_INET: 1779 xs_reclassify_socket4(sock); 1780 break; 1781 case AF_INET6: 1782 xs_reclassify_socket6(sock); 1783 break; 1784 } 1785 } 1786 #else 1787 static inline void xs_reclassify_socketu(struct socket *sock) 1788 { 1789 } 1790 1791 static inline void xs_reclassify_socket4(struct socket *sock) 1792 { 1793 } 1794 1795 static inline void xs_reclassify_socket6(struct socket *sock) 1796 { 1797 } 1798 1799 static inline void xs_reclassify_socket(int family, struct socket *sock) 1800 { 1801 } 1802 #endif 1803 1804 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1805 struct sock_xprt *transport, int family, int type, int protocol) 1806 { 1807 struct socket *sock; 1808 int err; 1809 1810 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1811 if (err < 0) { 1812 dprintk("RPC: can't create %d transport socket (%d).\n", 1813 protocol, -err); 1814 goto out; 1815 } 1816 xs_reclassify_socket(family, sock); 1817 1818 err = xs_bind(transport, sock); 1819 if (err) { 1820 sock_release(sock); 1821 goto out; 1822 } 1823 1824 return sock; 1825 out: 1826 return ERR_PTR(err); 1827 } 1828 1829 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1830 struct socket *sock) 1831 { 1832 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1833 xprt); 1834 1835 if (!transport->inet) { 1836 struct sock *sk = sock->sk; 1837 1838 write_lock_bh(&sk->sk_callback_lock); 1839 1840 xs_save_old_callbacks(transport, sk); 1841 1842 sk->sk_user_data = xprt; 1843 sk->sk_data_ready = xs_local_data_ready; 1844 sk->sk_write_space = xs_udp_write_space; 1845 sk->sk_allocation = GFP_ATOMIC; 1846 1847 xprt_clear_connected(xprt); 1848 1849 /* Reset to new socket */ 1850 transport->sock = sock; 1851 transport->inet = sk; 1852 1853 write_unlock_bh(&sk->sk_callback_lock); 1854 } 1855 1856 /* Tell the socket layer to start connecting... */ 1857 xprt->stat.connect_count++; 1858 xprt->stat.connect_start = jiffies; 1859 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1860 } 1861 1862 /** 1863 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1864 * @xprt: RPC transport to connect 1865 * @transport: socket transport to connect 1866 * @create_sock: function to create a socket of the correct type 1867 * 1868 * Invoked by a work queue tasklet. 1869 */ 1870 static void xs_local_setup_socket(struct work_struct *work) 1871 { 1872 struct sock_xprt *transport = 1873 container_of(work, struct sock_xprt, connect_worker.work); 1874 struct rpc_xprt *xprt = &transport->xprt; 1875 struct socket *sock; 1876 int status = -EIO; 1877 1878 current->flags |= PF_FSTRANS; 1879 1880 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1881 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1882 SOCK_STREAM, 0, &sock, 1); 1883 if (status < 0) { 1884 dprintk("RPC: can't create AF_LOCAL " 1885 "transport socket (%d).\n", -status); 1886 goto out; 1887 } 1888 xs_reclassify_socketu(sock); 1889 1890 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1891 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1892 1893 status = xs_local_finish_connecting(xprt, sock); 1894 switch (status) { 1895 case 0: 1896 dprintk("RPC: xprt %p connected to %s\n", 1897 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1898 xprt_set_connected(xprt); 1899 break; 1900 case -ENOENT: 1901 dprintk("RPC: xprt %p: socket %s does not exist\n", 1902 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1903 break; 1904 default: 1905 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1906 __func__, -status, 1907 xprt->address_strings[RPC_DISPLAY_ADDR]); 1908 } 1909 1910 out: 1911 xprt_clear_connecting(xprt); 1912 xprt_wake_pending_tasks(xprt, status); 1913 current->flags &= ~PF_FSTRANS; 1914 } 1915 1916 #ifdef CONFIG_SUNRPC_SWAP 1917 static void xs_set_memalloc(struct rpc_xprt *xprt) 1918 { 1919 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1920 xprt); 1921 1922 if (xprt->swapper) 1923 sk_set_memalloc(transport->inet); 1924 } 1925 1926 /** 1927 * xs_swapper - Tag this transport as being used for swap. 1928 * @xprt: transport to tag 1929 * @enable: enable/disable 1930 * 1931 */ 1932 int xs_swapper(struct rpc_xprt *xprt, int enable) 1933 { 1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1935 xprt); 1936 int err = 0; 1937 1938 if (enable) { 1939 xprt->swapper++; 1940 xs_set_memalloc(xprt); 1941 } else if (xprt->swapper) { 1942 xprt->swapper--; 1943 sk_clear_memalloc(transport->inet); 1944 } 1945 1946 return err; 1947 } 1948 EXPORT_SYMBOL_GPL(xs_swapper); 1949 #else 1950 static void xs_set_memalloc(struct rpc_xprt *xprt) 1951 { 1952 } 1953 #endif 1954 1955 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1956 { 1957 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1958 1959 if (!transport->inet) { 1960 struct sock *sk = sock->sk; 1961 1962 write_lock_bh(&sk->sk_callback_lock); 1963 1964 xs_save_old_callbacks(transport, sk); 1965 1966 sk->sk_user_data = xprt; 1967 sk->sk_data_ready = xs_udp_data_ready; 1968 sk->sk_write_space = xs_udp_write_space; 1969 sk->sk_no_check = UDP_CSUM_NORCV; 1970 sk->sk_allocation = GFP_ATOMIC; 1971 1972 xprt_set_connected(xprt); 1973 1974 /* Reset to new socket */ 1975 transport->sock = sock; 1976 transport->inet = sk; 1977 1978 xs_set_memalloc(xprt); 1979 1980 write_unlock_bh(&sk->sk_callback_lock); 1981 } 1982 xs_udp_do_set_buffer_size(xprt); 1983 } 1984 1985 static void xs_udp_setup_socket(struct work_struct *work) 1986 { 1987 struct sock_xprt *transport = 1988 container_of(work, struct sock_xprt, connect_worker.work); 1989 struct rpc_xprt *xprt = &transport->xprt; 1990 struct socket *sock = transport->sock; 1991 int status = -EIO; 1992 1993 current->flags |= PF_FSTRANS; 1994 1995 /* Start by resetting any existing state */ 1996 xs_reset_transport(transport); 1997 sock = xs_create_sock(xprt, transport, 1998 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 1999 if (IS_ERR(sock)) 2000 goto out; 2001 2002 dprintk("RPC: worker connecting xprt %p via %s to " 2003 "%s (port %s)\n", xprt, 2004 xprt->address_strings[RPC_DISPLAY_PROTO], 2005 xprt->address_strings[RPC_DISPLAY_ADDR], 2006 xprt->address_strings[RPC_DISPLAY_PORT]); 2007 2008 xs_udp_finish_connecting(xprt, sock); 2009 status = 0; 2010 out: 2011 xprt_clear_connecting(xprt); 2012 xprt_wake_pending_tasks(xprt, status); 2013 current->flags &= ~PF_FSTRANS; 2014 } 2015 2016 /* 2017 * We need to preserve the port number so the reply cache on the server can 2018 * find our cached RPC replies when we get around to reconnecting. 2019 */ 2020 static void xs_abort_connection(struct sock_xprt *transport) 2021 { 2022 int result; 2023 struct sockaddr any; 2024 2025 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2026 2027 /* 2028 * Disconnect the transport socket by doing a connect operation 2029 * with AF_UNSPEC. This should return immediately... 2030 */ 2031 memset(&any, 0, sizeof(any)); 2032 any.sa_family = AF_UNSPEC; 2033 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2034 if (!result) 2035 xs_sock_reset_connection_flags(&transport->xprt); 2036 dprintk("RPC: AF_UNSPEC connect return code %d\n", result); 2037 } 2038 2039 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2040 { 2041 unsigned int state = transport->inet->sk_state; 2042 2043 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2044 /* we don't need to abort the connection if the socket 2045 * hasn't undergone a shutdown 2046 */ 2047 if (transport->inet->sk_shutdown == 0) 2048 return; 2049 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2050 __func__, transport->inet->sk_shutdown); 2051 } 2052 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2053 /* we don't need to abort the connection if the socket 2054 * hasn't undergone a shutdown 2055 */ 2056 if (transport->inet->sk_shutdown == 0) 2057 return; 2058 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2059 "sk_shutdown set to %d\n", 2060 __func__, transport->inet->sk_shutdown); 2061 } 2062 xs_abort_connection(transport); 2063 } 2064 2065 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2066 { 2067 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2068 int ret = -ENOTCONN; 2069 2070 if (!transport->inet) { 2071 struct sock *sk = sock->sk; 2072 2073 write_lock_bh(&sk->sk_callback_lock); 2074 2075 xs_save_old_callbacks(transport, sk); 2076 2077 sk->sk_user_data = xprt; 2078 sk->sk_data_ready = xs_tcp_data_ready; 2079 sk->sk_state_change = xs_tcp_state_change; 2080 sk->sk_write_space = xs_tcp_write_space; 2081 sk->sk_allocation = GFP_ATOMIC; 2082 2083 /* socket options */ 2084 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2085 sock_reset_flag(sk, SOCK_LINGER); 2086 tcp_sk(sk)->linger2 = 0; 2087 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2088 2089 xprt_clear_connected(xprt); 2090 2091 /* Reset to new socket */ 2092 transport->sock = sock; 2093 transport->inet = sk; 2094 2095 write_unlock_bh(&sk->sk_callback_lock); 2096 } 2097 2098 if (!xprt_bound(xprt)) 2099 goto out; 2100 2101 xs_set_memalloc(xprt); 2102 2103 /* Tell the socket layer to start connecting... */ 2104 xprt->stat.connect_count++; 2105 xprt->stat.connect_start = jiffies; 2106 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2107 switch (ret) { 2108 case 0: 2109 case -EINPROGRESS: 2110 /* SYN_SENT! */ 2111 xprt->connect_cookie++; 2112 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2113 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2114 } 2115 out: 2116 return ret; 2117 } 2118 2119 /** 2120 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2121 * @xprt: RPC transport to connect 2122 * @transport: socket transport to connect 2123 * @create_sock: function to create a socket of the correct type 2124 * 2125 * Invoked by a work queue tasklet. 2126 */ 2127 static void xs_tcp_setup_socket(struct work_struct *work) 2128 { 2129 struct sock_xprt *transport = 2130 container_of(work, struct sock_xprt, connect_worker.work); 2131 struct socket *sock = transport->sock; 2132 struct rpc_xprt *xprt = &transport->xprt; 2133 int status = -EIO; 2134 2135 current->flags |= PF_FSTRANS; 2136 2137 if (!sock) { 2138 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2139 sock = xs_create_sock(xprt, transport, 2140 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2141 if (IS_ERR(sock)) { 2142 status = PTR_ERR(sock); 2143 goto out; 2144 } 2145 } else { 2146 int abort_and_exit; 2147 2148 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2149 &xprt->state); 2150 /* "close" the socket, preserving the local port */ 2151 xs_tcp_reuse_connection(transport); 2152 2153 if (abort_and_exit) 2154 goto out_eagain; 2155 } 2156 2157 dprintk("RPC: worker connecting xprt %p via %s to " 2158 "%s (port %s)\n", xprt, 2159 xprt->address_strings[RPC_DISPLAY_PROTO], 2160 xprt->address_strings[RPC_DISPLAY_ADDR], 2161 xprt->address_strings[RPC_DISPLAY_PORT]); 2162 2163 status = xs_tcp_finish_connecting(xprt, sock); 2164 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2165 xprt, -status, xprt_connected(xprt), 2166 sock->sk->sk_state); 2167 switch (status) { 2168 default: 2169 printk("%s: connect returned unhandled error %d\n", 2170 __func__, status); 2171 case -EADDRNOTAVAIL: 2172 /* We're probably in TIME_WAIT. Get rid of existing socket, 2173 * and retry 2174 */ 2175 xs_tcp_force_close(xprt); 2176 break; 2177 case -ECONNREFUSED: 2178 case -ECONNRESET: 2179 case -ENETUNREACH: 2180 /* retry with existing socket, after a delay */ 2181 case 0: 2182 case -EINPROGRESS: 2183 case -EALREADY: 2184 xprt_clear_connecting(xprt); 2185 current->flags &= ~PF_FSTRANS; 2186 return; 2187 case -EINVAL: 2188 /* Happens, for instance, if the user specified a link 2189 * local IPv6 address without a scope-id. 2190 */ 2191 goto out; 2192 } 2193 out_eagain: 2194 status = -EAGAIN; 2195 out: 2196 xprt_clear_connecting(xprt); 2197 xprt_wake_pending_tasks(xprt, status); 2198 current->flags &= ~PF_FSTRANS; 2199 } 2200 2201 /** 2202 * xs_connect - connect a socket to a remote endpoint 2203 * @task: address of RPC task that manages state of connect request 2204 * 2205 * TCP: If the remote end dropped the connection, delay reconnecting. 2206 * 2207 * UDP socket connects are synchronous, but we use a work queue anyway 2208 * to guarantee that even unprivileged user processes can set up a 2209 * socket on a privileged port. 2210 * 2211 * If a UDP socket connect fails, the delay behavior here prevents 2212 * retry floods (hard mounts). 2213 */ 2214 static void xs_connect(struct rpc_task *task) 2215 { 2216 struct rpc_xprt *xprt = task->tk_xprt; 2217 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2218 2219 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2220 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2221 "seconds\n", 2222 xprt, xprt->reestablish_timeout / HZ); 2223 queue_delayed_work(rpciod_workqueue, 2224 &transport->connect_worker, 2225 xprt->reestablish_timeout); 2226 xprt->reestablish_timeout <<= 1; 2227 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2228 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2229 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2230 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2231 } else { 2232 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2233 queue_delayed_work(rpciod_workqueue, 2234 &transport->connect_worker, 0); 2235 } 2236 } 2237 2238 /** 2239 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2240 * @xprt: rpc_xprt struct containing statistics 2241 * @seq: output file 2242 * 2243 */ 2244 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2245 { 2246 long idle_time = 0; 2247 2248 if (xprt_connected(xprt)) 2249 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2250 2251 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2252 "%llu %llu %lu %llu %llu\n", 2253 xprt->stat.bind_count, 2254 xprt->stat.connect_count, 2255 xprt->stat.connect_time, 2256 idle_time, 2257 xprt->stat.sends, 2258 xprt->stat.recvs, 2259 xprt->stat.bad_xids, 2260 xprt->stat.req_u, 2261 xprt->stat.bklog_u, 2262 xprt->stat.max_slots, 2263 xprt->stat.sending_u, 2264 xprt->stat.pending_u); 2265 } 2266 2267 /** 2268 * xs_udp_print_stats - display UDP socket-specifc stats 2269 * @xprt: rpc_xprt struct containing statistics 2270 * @seq: output file 2271 * 2272 */ 2273 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2274 { 2275 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2276 2277 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2278 "%lu %llu %llu\n", 2279 transport->srcport, 2280 xprt->stat.bind_count, 2281 xprt->stat.sends, 2282 xprt->stat.recvs, 2283 xprt->stat.bad_xids, 2284 xprt->stat.req_u, 2285 xprt->stat.bklog_u, 2286 xprt->stat.max_slots, 2287 xprt->stat.sending_u, 2288 xprt->stat.pending_u); 2289 } 2290 2291 /** 2292 * xs_tcp_print_stats - display TCP socket-specifc stats 2293 * @xprt: rpc_xprt struct containing statistics 2294 * @seq: output file 2295 * 2296 */ 2297 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2298 { 2299 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2300 long idle_time = 0; 2301 2302 if (xprt_connected(xprt)) 2303 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2304 2305 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2306 "%llu %llu %lu %llu %llu\n", 2307 transport->srcport, 2308 xprt->stat.bind_count, 2309 xprt->stat.connect_count, 2310 xprt->stat.connect_time, 2311 idle_time, 2312 xprt->stat.sends, 2313 xprt->stat.recvs, 2314 xprt->stat.bad_xids, 2315 xprt->stat.req_u, 2316 xprt->stat.bklog_u, 2317 xprt->stat.max_slots, 2318 xprt->stat.sending_u, 2319 xprt->stat.pending_u); 2320 } 2321 2322 /* 2323 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2324 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2325 * to use the server side send routines. 2326 */ 2327 static void *bc_malloc(struct rpc_task *task, size_t size) 2328 { 2329 struct page *page; 2330 struct rpc_buffer *buf; 2331 2332 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2333 page = alloc_page(GFP_KERNEL); 2334 2335 if (!page) 2336 return NULL; 2337 2338 buf = page_address(page); 2339 buf->len = PAGE_SIZE; 2340 2341 return buf->data; 2342 } 2343 2344 /* 2345 * Free the space allocated in the bc_alloc routine 2346 */ 2347 static void bc_free(void *buffer) 2348 { 2349 struct rpc_buffer *buf; 2350 2351 if (!buffer) 2352 return; 2353 2354 buf = container_of(buffer, struct rpc_buffer, data); 2355 free_page((unsigned long)buf); 2356 } 2357 2358 /* 2359 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2360 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2361 */ 2362 static int bc_sendto(struct rpc_rqst *req) 2363 { 2364 int len; 2365 struct xdr_buf *xbufp = &req->rq_snd_buf; 2366 struct rpc_xprt *xprt = req->rq_xprt; 2367 struct sock_xprt *transport = 2368 container_of(xprt, struct sock_xprt, xprt); 2369 struct socket *sock = transport->sock; 2370 unsigned long headoff; 2371 unsigned long tailoff; 2372 2373 xs_encode_stream_record_marker(xbufp); 2374 2375 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2376 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2377 len = svc_send_common(sock, xbufp, 2378 virt_to_page(xbufp->head[0].iov_base), headoff, 2379 xbufp->tail[0].iov_base, tailoff); 2380 2381 if (len != xbufp->len) { 2382 printk(KERN_NOTICE "Error sending entire callback!\n"); 2383 len = -EAGAIN; 2384 } 2385 2386 return len; 2387 } 2388 2389 /* 2390 * The send routine. Borrows from svc_send 2391 */ 2392 static int bc_send_request(struct rpc_task *task) 2393 { 2394 struct rpc_rqst *req = task->tk_rqstp; 2395 struct svc_xprt *xprt; 2396 struct svc_sock *svsk; 2397 u32 len; 2398 2399 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2400 /* 2401 * Get the server socket associated with this callback xprt 2402 */ 2403 xprt = req->rq_xprt->bc_xprt; 2404 svsk = container_of(xprt, struct svc_sock, sk_xprt); 2405 2406 /* 2407 * Grab the mutex to serialize data as the connection is shared 2408 * with the fore channel 2409 */ 2410 if (!mutex_trylock(&xprt->xpt_mutex)) { 2411 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2412 if (!mutex_trylock(&xprt->xpt_mutex)) 2413 return -EAGAIN; 2414 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2415 } 2416 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2417 len = -ENOTCONN; 2418 else 2419 len = bc_sendto(req); 2420 mutex_unlock(&xprt->xpt_mutex); 2421 2422 if (len > 0) 2423 len = 0; 2424 2425 return len; 2426 } 2427 2428 /* 2429 * The close routine. Since this is client initiated, we do nothing 2430 */ 2431 2432 static void bc_close(struct rpc_xprt *xprt) 2433 { 2434 } 2435 2436 /* 2437 * The xprt destroy routine. Again, because this connection is client 2438 * initiated, we do nothing 2439 */ 2440 2441 static void bc_destroy(struct rpc_xprt *xprt) 2442 { 2443 } 2444 2445 static struct rpc_xprt_ops xs_local_ops = { 2446 .reserve_xprt = xprt_reserve_xprt, 2447 .release_xprt = xs_tcp_release_xprt, 2448 .alloc_slot = xprt_alloc_slot, 2449 .rpcbind = xs_local_rpcbind, 2450 .set_port = xs_local_set_port, 2451 .connect = xs_connect, 2452 .buf_alloc = rpc_malloc, 2453 .buf_free = rpc_free, 2454 .send_request = xs_local_send_request, 2455 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2456 .close = xs_close, 2457 .destroy = xs_destroy, 2458 .print_stats = xs_local_print_stats, 2459 }; 2460 2461 static struct rpc_xprt_ops xs_udp_ops = { 2462 .set_buffer_size = xs_udp_set_buffer_size, 2463 .reserve_xprt = xprt_reserve_xprt_cong, 2464 .release_xprt = xprt_release_xprt_cong, 2465 .alloc_slot = xprt_alloc_slot, 2466 .rpcbind = rpcb_getport_async, 2467 .set_port = xs_set_port, 2468 .connect = xs_connect, 2469 .buf_alloc = rpc_malloc, 2470 .buf_free = rpc_free, 2471 .send_request = xs_udp_send_request, 2472 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2473 .timer = xs_udp_timer, 2474 .release_request = xprt_release_rqst_cong, 2475 .close = xs_close, 2476 .destroy = xs_destroy, 2477 .print_stats = xs_udp_print_stats, 2478 }; 2479 2480 static struct rpc_xprt_ops xs_tcp_ops = { 2481 .reserve_xprt = xprt_reserve_xprt, 2482 .release_xprt = xs_tcp_release_xprt, 2483 .alloc_slot = xprt_lock_and_alloc_slot, 2484 .rpcbind = rpcb_getport_async, 2485 .set_port = xs_set_port, 2486 .connect = xs_connect, 2487 .buf_alloc = rpc_malloc, 2488 .buf_free = rpc_free, 2489 .send_request = xs_tcp_send_request, 2490 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2491 .close = xs_tcp_close, 2492 .destroy = xs_destroy, 2493 .print_stats = xs_tcp_print_stats, 2494 }; 2495 2496 /* 2497 * The rpc_xprt_ops for the server backchannel 2498 */ 2499 2500 static struct rpc_xprt_ops bc_tcp_ops = { 2501 .reserve_xprt = xprt_reserve_xprt, 2502 .release_xprt = xprt_release_xprt, 2503 .alloc_slot = xprt_alloc_slot, 2504 .rpcbind = xs_local_rpcbind, 2505 .buf_alloc = bc_malloc, 2506 .buf_free = bc_free, 2507 .send_request = bc_send_request, 2508 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2509 .close = bc_close, 2510 .destroy = bc_destroy, 2511 .print_stats = xs_tcp_print_stats, 2512 }; 2513 2514 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2515 { 2516 static const struct sockaddr_in sin = { 2517 .sin_family = AF_INET, 2518 .sin_addr.s_addr = htonl(INADDR_ANY), 2519 }; 2520 static const struct sockaddr_in6 sin6 = { 2521 .sin6_family = AF_INET6, 2522 .sin6_addr = IN6ADDR_ANY_INIT, 2523 }; 2524 2525 switch (family) { 2526 case AF_LOCAL: 2527 break; 2528 case AF_INET: 2529 memcpy(sap, &sin, sizeof(sin)); 2530 break; 2531 case AF_INET6: 2532 memcpy(sap, &sin6, sizeof(sin6)); 2533 break; 2534 default: 2535 dprintk("RPC: %s: Bad address family\n", __func__); 2536 return -EAFNOSUPPORT; 2537 } 2538 return 0; 2539 } 2540 2541 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2542 unsigned int slot_table_size, 2543 unsigned int max_slot_table_size) 2544 { 2545 struct rpc_xprt *xprt; 2546 struct sock_xprt *new; 2547 2548 if (args->addrlen > sizeof(xprt->addr)) { 2549 dprintk("RPC: xs_setup_xprt: address too large\n"); 2550 return ERR_PTR(-EBADF); 2551 } 2552 2553 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2554 max_slot_table_size); 2555 if (xprt == NULL) { 2556 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2557 "rpc_xprt\n"); 2558 return ERR_PTR(-ENOMEM); 2559 } 2560 2561 new = container_of(xprt, struct sock_xprt, xprt); 2562 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2563 xprt->addrlen = args->addrlen; 2564 if (args->srcaddr) 2565 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2566 else { 2567 int err; 2568 err = xs_init_anyaddr(args->dstaddr->sa_family, 2569 (struct sockaddr *)&new->srcaddr); 2570 if (err != 0) { 2571 xprt_free(xprt); 2572 return ERR_PTR(err); 2573 } 2574 } 2575 2576 return xprt; 2577 } 2578 2579 static const struct rpc_timeout xs_local_default_timeout = { 2580 .to_initval = 10 * HZ, 2581 .to_maxval = 10 * HZ, 2582 .to_retries = 2, 2583 }; 2584 2585 /** 2586 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2587 * @args: rpc transport creation arguments 2588 * 2589 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2590 */ 2591 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2592 { 2593 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2594 struct sock_xprt *transport; 2595 struct rpc_xprt *xprt; 2596 struct rpc_xprt *ret; 2597 2598 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2599 xprt_max_tcp_slot_table_entries); 2600 if (IS_ERR(xprt)) 2601 return xprt; 2602 transport = container_of(xprt, struct sock_xprt, xprt); 2603 2604 xprt->prot = 0; 2605 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2606 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2607 2608 xprt->bind_timeout = XS_BIND_TO; 2609 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2610 xprt->idle_timeout = XS_IDLE_DISC_TO; 2611 2612 xprt->ops = &xs_local_ops; 2613 xprt->timeout = &xs_local_default_timeout; 2614 2615 switch (sun->sun_family) { 2616 case AF_LOCAL: 2617 if (sun->sun_path[0] != '/') { 2618 dprintk("RPC: bad AF_LOCAL address: %s\n", 2619 sun->sun_path); 2620 ret = ERR_PTR(-EINVAL); 2621 goto out_err; 2622 } 2623 xprt_set_bound(xprt); 2624 INIT_DELAYED_WORK(&transport->connect_worker, 2625 xs_local_setup_socket); 2626 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2627 break; 2628 default: 2629 ret = ERR_PTR(-EAFNOSUPPORT); 2630 goto out_err; 2631 } 2632 2633 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2634 xprt->address_strings[RPC_DISPLAY_ADDR]); 2635 2636 if (try_module_get(THIS_MODULE)) 2637 return xprt; 2638 ret = ERR_PTR(-EINVAL); 2639 out_err: 2640 xprt_free(xprt); 2641 return ret; 2642 } 2643 2644 static const struct rpc_timeout xs_udp_default_timeout = { 2645 .to_initval = 5 * HZ, 2646 .to_maxval = 30 * HZ, 2647 .to_increment = 5 * HZ, 2648 .to_retries = 5, 2649 }; 2650 2651 /** 2652 * xs_setup_udp - Set up transport to use a UDP socket 2653 * @args: rpc transport creation arguments 2654 * 2655 */ 2656 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2657 { 2658 struct sockaddr *addr = args->dstaddr; 2659 struct rpc_xprt *xprt; 2660 struct sock_xprt *transport; 2661 struct rpc_xprt *ret; 2662 2663 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2664 xprt_udp_slot_table_entries); 2665 if (IS_ERR(xprt)) 2666 return xprt; 2667 transport = container_of(xprt, struct sock_xprt, xprt); 2668 2669 xprt->prot = IPPROTO_UDP; 2670 xprt->tsh_size = 0; 2671 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2672 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2673 2674 xprt->bind_timeout = XS_BIND_TO; 2675 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2676 xprt->idle_timeout = XS_IDLE_DISC_TO; 2677 2678 xprt->ops = &xs_udp_ops; 2679 2680 xprt->timeout = &xs_udp_default_timeout; 2681 2682 switch (addr->sa_family) { 2683 case AF_INET: 2684 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2685 xprt_set_bound(xprt); 2686 2687 INIT_DELAYED_WORK(&transport->connect_worker, 2688 xs_udp_setup_socket); 2689 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2690 break; 2691 case AF_INET6: 2692 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2693 xprt_set_bound(xprt); 2694 2695 INIT_DELAYED_WORK(&transport->connect_worker, 2696 xs_udp_setup_socket); 2697 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2698 break; 2699 default: 2700 ret = ERR_PTR(-EAFNOSUPPORT); 2701 goto out_err; 2702 } 2703 2704 if (xprt_bound(xprt)) 2705 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2706 xprt->address_strings[RPC_DISPLAY_ADDR], 2707 xprt->address_strings[RPC_DISPLAY_PORT], 2708 xprt->address_strings[RPC_DISPLAY_PROTO]); 2709 else 2710 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2711 xprt->address_strings[RPC_DISPLAY_ADDR], 2712 xprt->address_strings[RPC_DISPLAY_PROTO]); 2713 2714 if (try_module_get(THIS_MODULE)) 2715 return xprt; 2716 ret = ERR_PTR(-EINVAL); 2717 out_err: 2718 xprt_free(xprt); 2719 return ret; 2720 } 2721 2722 static const struct rpc_timeout xs_tcp_default_timeout = { 2723 .to_initval = 60 * HZ, 2724 .to_maxval = 60 * HZ, 2725 .to_retries = 2, 2726 }; 2727 2728 /** 2729 * xs_setup_tcp - Set up transport to use a TCP socket 2730 * @args: rpc transport creation arguments 2731 * 2732 */ 2733 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2734 { 2735 struct sockaddr *addr = args->dstaddr; 2736 struct rpc_xprt *xprt; 2737 struct sock_xprt *transport; 2738 struct rpc_xprt *ret; 2739 2740 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2741 xprt_max_tcp_slot_table_entries); 2742 if (IS_ERR(xprt)) 2743 return xprt; 2744 transport = container_of(xprt, struct sock_xprt, xprt); 2745 2746 xprt->prot = IPPROTO_TCP; 2747 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2748 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2749 2750 xprt->bind_timeout = XS_BIND_TO; 2751 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2752 xprt->idle_timeout = XS_IDLE_DISC_TO; 2753 2754 xprt->ops = &xs_tcp_ops; 2755 xprt->timeout = &xs_tcp_default_timeout; 2756 2757 switch (addr->sa_family) { 2758 case AF_INET: 2759 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2760 xprt_set_bound(xprt); 2761 2762 INIT_DELAYED_WORK(&transport->connect_worker, 2763 xs_tcp_setup_socket); 2764 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2765 break; 2766 case AF_INET6: 2767 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2768 xprt_set_bound(xprt); 2769 2770 INIT_DELAYED_WORK(&transport->connect_worker, 2771 xs_tcp_setup_socket); 2772 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2773 break; 2774 default: 2775 ret = ERR_PTR(-EAFNOSUPPORT); 2776 goto out_err; 2777 } 2778 2779 if (xprt_bound(xprt)) 2780 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2781 xprt->address_strings[RPC_DISPLAY_ADDR], 2782 xprt->address_strings[RPC_DISPLAY_PORT], 2783 xprt->address_strings[RPC_DISPLAY_PROTO]); 2784 else 2785 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2786 xprt->address_strings[RPC_DISPLAY_ADDR], 2787 xprt->address_strings[RPC_DISPLAY_PROTO]); 2788 2789 2790 if (try_module_get(THIS_MODULE)) 2791 return xprt; 2792 ret = ERR_PTR(-EINVAL); 2793 out_err: 2794 xprt_free(xprt); 2795 return ret; 2796 } 2797 2798 /** 2799 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2800 * @args: rpc transport creation arguments 2801 * 2802 */ 2803 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2804 { 2805 struct sockaddr *addr = args->dstaddr; 2806 struct rpc_xprt *xprt; 2807 struct sock_xprt *transport; 2808 struct svc_sock *bc_sock; 2809 struct rpc_xprt *ret; 2810 2811 if (args->bc_xprt->xpt_bc_xprt) { 2812 /* 2813 * This server connection already has a backchannel 2814 * export; we can't create a new one, as we wouldn't be 2815 * able to match replies based on xid any more. So, 2816 * reuse the already-existing one: 2817 */ 2818 return args->bc_xprt->xpt_bc_xprt; 2819 } 2820 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2821 xprt_tcp_slot_table_entries); 2822 if (IS_ERR(xprt)) 2823 return xprt; 2824 transport = container_of(xprt, struct sock_xprt, xprt); 2825 2826 xprt->prot = IPPROTO_TCP; 2827 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2828 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2829 xprt->timeout = &xs_tcp_default_timeout; 2830 2831 /* backchannel */ 2832 xprt_set_bound(xprt); 2833 xprt->bind_timeout = 0; 2834 xprt->reestablish_timeout = 0; 2835 xprt->idle_timeout = 0; 2836 2837 xprt->ops = &bc_tcp_ops; 2838 2839 switch (addr->sa_family) { 2840 case AF_INET: 2841 xs_format_peer_addresses(xprt, "tcp", 2842 RPCBIND_NETID_TCP); 2843 break; 2844 case AF_INET6: 2845 xs_format_peer_addresses(xprt, "tcp", 2846 RPCBIND_NETID_TCP6); 2847 break; 2848 default: 2849 ret = ERR_PTR(-EAFNOSUPPORT); 2850 goto out_err; 2851 } 2852 2853 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2854 xprt->address_strings[RPC_DISPLAY_ADDR], 2855 xprt->address_strings[RPC_DISPLAY_PORT], 2856 xprt->address_strings[RPC_DISPLAY_PROTO]); 2857 2858 /* 2859 * Once we've associated a backchannel xprt with a connection, 2860 * we want to keep it around as long as long as the connection 2861 * lasts, in case we need to start using it for a backchannel 2862 * again; this reference won't be dropped until bc_xprt is 2863 * destroyed. 2864 */ 2865 xprt_get(xprt); 2866 args->bc_xprt->xpt_bc_xprt = xprt; 2867 xprt->bc_xprt = args->bc_xprt; 2868 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2869 transport->sock = bc_sock->sk_sock; 2870 transport->inet = bc_sock->sk_sk; 2871 2872 /* 2873 * Since we don't want connections for the backchannel, we set 2874 * the xprt status to connected 2875 */ 2876 xprt_set_connected(xprt); 2877 2878 2879 if (try_module_get(THIS_MODULE)) 2880 return xprt; 2881 xprt_put(xprt); 2882 ret = ERR_PTR(-EINVAL); 2883 out_err: 2884 xprt_free(xprt); 2885 return ret; 2886 } 2887 2888 static struct xprt_class xs_local_transport = { 2889 .list = LIST_HEAD_INIT(xs_local_transport.list), 2890 .name = "named UNIX socket", 2891 .owner = THIS_MODULE, 2892 .ident = XPRT_TRANSPORT_LOCAL, 2893 .setup = xs_setup_local, 2894 }; 2895 2896 static struct xprt_class xs_udp_transport = { 2897 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2898 .name = "udp", 2899 .owner = THIS_MODULE, 2900 .ident = XPRT_TRANSPORT_UDP, 2901 .setup = xs_setup_udp, 2902 }; 2903 2904 static struct xprt_class xs_tcp_transport = { 2905 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2906 .name = "tcp", 2907 .owner = THIS_MODULE, 2908 .ident = XPRT_TRANSPORT_TCP, 2909 .setup = xs_setup_tcp, 2910 }; 2911 2912 static struct xprt_class xs_bc_tcp_transport = { 2913 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2914 .name = "tcp NFSv4.1 backchannel", 2915 .owner = THIS_MODULE, 2916 .ident = XPRT_TRANSPORT_BC_TCP, 2917 .setup = xs_setup_bc_tcp, 2918 }; 2919 2920 /** 2921 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2922 * 2923 */ 2924 int init_socket_xprt(void) 2925 { 2926 #ifdef RPC_DEBUG 2927 if (!sunrpc_table_header) 2928 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2929 #endif 2930 2931 xprt_register_transport(&xs_local_transport); 2932 xprt_register_transport(&xs_udp_transport); 2933 xprt_register_transport(&xs_tcp_transport); 2934 xprt_register_transport(&xs_bc_tcp_transport); 2935 2936 return 0; 2937 } 2938 2939 /** 2940 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2941 * 2942 */ 2943 void cleanup_socket_xprt(void) 2944 { 2945 #ifdef RPC_DEBUG 2946 if (sunrpc_table_header) { 2947 unregister_sysctl_table(sunrpc_table_header); 2948 sunrpc_table_header = NULL; 2949 } 2950 #endif 2951 2952 xprt_unregister_transport(&xs_local_transport); 2953 xprt_unregister_transport(&xs_udp_transport); 2954 xprt_unregister_transport(&xs_tcp_transport); 2955 xprt_unregister_transport(&xs_bc_tcp_transport); 2956 } 2957 2958 static int param_set_uint_minmax(const char *val, 2959 const struct kernel_param *kp, 2960 unsigned int min, unsigned int max) 2961 { 2962 unsigned long num; 2963 int ret; 2964 2965 if (!val) 2966 return -EINVAL; 2967 ret = strict_strtoul(val, 0, &num); 2968 if (ret == -EINVAL || num < min || num > max) 2969 return -EINVAL; 2970 *((unsigned int *)kp->arg) = num; 2971 return 0; 2972 } 2973 2974 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2975 { 2976 return param_set_uint_minmax(val, kp, 2977 RPC_MIN_RESVPORT, 2978 RPC_MAX_RESVPORT); 2979 } 2980 2981 static struct kernel_param_ops param_ops_portnr = { 2982 .set = param_set_portnr, 2983 .get = param_get_uint, 2984 }; 2985 2986 #define param_check_portnr(name, p) \ 2987 __param_check(name, p, unsigned int); 2988 2989 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 2990 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 2991 2992 static int param_set_slot_table_size(const char *val, 2993 const struct kernel_param *kp) 2994 { 2995 return param_set_uint_minmax(val, kp, 2996 RPC_MIN_SLOT_TABLE, 2997 RPC_MAX_SLOT_TABLE); 2998 } 2999 3000 static struct kernel_param_ops param_ops_slot_table_size = { 3001 .set = param_set_slot_table_size, 3002 .get = param_get_uint, 3003 }; 3004 3005 #define param_check_slot_table_size(name, p) \ 3006 __param_check(name, p, unsigned int); 3007 3008 static int param_set_max_slot_table_size(const char *val, 3009 const struct kernel_param *kp) 3010 { 3011 return param_set_uint_minmax(val, kp, 3012 RPC_MIN_SLOT_TABLE, 3013 RPC_MAX_SLOT_TABLE_LIMIT); 3014 } 3015 3016 static struct kernel_param_ops param_ops_max_slot_table_size = { 3017 .set = param_set_max_slot_table_size, 3018 .get = param_get_uint, 3019 }; 3020 3021 #define param_check_max_slot_table_size(name, p) \ 3022 __param_check(name, p, unsigned int); 3023 3024 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3025 slot_table_size, 0644); 3026 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3027 max_slot_table_size, 0644); 3028 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3029 slot_table_size, 0644); 3030 3031