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, &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(xprt, 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_xprt *xprt, struct rpc_task *task) 1650 { 1651 xprt_adjust_cwnd(xprt, 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 rcu_read_lock(); 1735 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); 1736 rcu_read_unlock(); 1737 } 1738 1739 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1740 { 1741 } 1742 1743 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1744 static struct lock_class_key xs_key[2]; 1745 static struct lock_class_key xs_slock_key[2]; 1746 1747 static inline void xs_reclassify_socketu(struct socket *sock) 1748 { 1749 struct sock *sk = sock->sk; 1750 1751 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1752 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1753 } 1754 1755 static inline void xs_reclassify_socket4(struct socket *sock) 1756 { 1757 struct sock *sk = sock->sk; 1758 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 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1768 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1769 } 1770 1771 static inline void xs_reclassify_socket(int family, struct socket *sock) 1772 { 1773 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1774 if (sock_owned_by_user(sock->sk)) 1775 return; 1776 1777 switch (family) { 1778 case AF_LOCAL: 1779 xs_reclassify_socketu(sock); 1780 break; 1781 case AF_INET: 1782 xs_reclassify_socket4(sock); 1783 break; 1784 case AF_INET6: 1785 xs_reclassify_socket6(sock); 1786 break; 1787 } 1788 } 1789 #else 1790 static inline void xs_reclassify_socketu(struct socket *sock) 1791 { 1792 } 1793 1794 static inline void xs_reclassify_socket4(struct socket *sock) 1795 { 1796 } 1797 1798 static inline void xs_reclassify_socket6(struct socket *sock) 1799 { 1800 } 1801 1802 static inline void xs_reclassify_socket(int family, struct socket *sock) 1803 { 1804 } 1805 #endif 1806 1807 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1808 struct sock_xprt *transport, int family, int type, int protocol) 1809 { 1810 struct socket *sock; 1811 int err; 1812 1813 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1814 if (err < 0) { 1815 dprintk("RPC: can't create %d transport socket (%d).\n", 1816 protocol, -err); 1817 goto out; 1818 } 1819 xs_reclassify_socket(family, sock); 1820 1821 err = xs_bind(transport, sock); 1822 if (err) { 1823 sock_release(sock); 1824 goto out; 1825 } 1826 1827 return sock; 1828 out: 1829 return ERR_PTR(err); 1830 } 1831 1832 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1833 struct socket *sock) 1834 { 1835 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1836 xprt); 1837 1838 if (!transport->inet) { 1839 struct sock *sk = sock->sk; 1840 1841 write_lock_bh(&sk->sk_callback_lock); 1842 1843 xs_save_old_callbacks(transport, sk); 1844 1845 sk->sk_user_data = xprt; 1846 sk->sk_data_ready = xs_local_data_ready; 1847 sk->sk_write_space = xs_udp_write_space; 1848 sk->sk_allocation = GFP_ATOMIC; 1849 1850 xprt_clear_connected(xprt); 1851 1852 /* Reset to new socket */ 1853 transport->sock = sock; 1854 transport->inet = sk; 1855 1856 write_unlock_bh(&sk->sk_callback_lock); 1857 } 1858 1859 /* Tell the socket layer to start connecting... */ 1860 xprt->stat.connect_count++; 1861 xprt->stat.connect_start = jiffies; 1862 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1863 } 1864 1865 /** 1866 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1867 * @xprt: RPC transport to connect 1868 * @transport: socket transport to connect 1869 * @create_sock: function to create a socket of the correct type 1870 * 1871 * Invoked by a work queue tasklet. 1872 */ 1873 static void xs_local_setup_socket(struct work_struct *work) 1874 { 1875 struct sock_xprt *transport = 1876 container_of(work, struct sock_xprt, connect_worker.work); 1877 struct rpc_xprt *xprt = &transport->xprt; 1878 struct socket *sock; 1879 int status = -EIO; 1880 1881 current->flags |= PF_FSTRANS; 1882 1883 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1884 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1885 SOCK_STREAM, 0, &sock, 1); 1886 if (status < 0) { 1887 dprintk("RPC: can't create AF_LOCAL " 1888 "transport socket (%d).\n", -status); 1889 goto out; 1890 } 1891 xs_reclassify_socketu(sock); 1892 1893 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1894 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1895 1896 status = xs_local_finish_connecting(xprt, sock); 1897 switch (status) { 1898 case 0: 1899 dprintk("RPC: xprt %p connected to %s\n", 1900 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1901 xprt_set_connected(xprt); 1902 break; 1903 case -ENOENT: 1904 dprintk("RPC: xprt %p: socket %s does not exist\n", 1905 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1906 break; 1907 case -ECONNREFUSED: 1908 dprintk("RPC: xprt %p: connection refused for %s\n", 1909 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1910 break; 1911 default: 1912 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1913 __func__, -status, 1914 xprt->address_strings[RPC_DISPLAY_ADDR]); 1915 } 1916 1917 out: 1918 xprt_clear_connecting(xprt); 1919 xprt_wake_pending_tasks(xprt, status); 1920 current->flags &= ~PF_FSTRANS; 1921 } 1922 1923 #ifdef CONFIG_SUNRPC_SWAP 1924 static void xs_set_memalloc(struct rpc_xprt *xprt) 1925 { 1926 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1927 xprt); 1928 1929 if (xprt->swapper) 1930 sk_set_memalloc(transport->inet); 1931 } 1932 1933 /** 1934 * xs_swapper - Tag this transport as being used for swap. 1935 * @xprt: transport to tag 1936 * @enable: enable/disable 1937 * 1938 */ 1939 int xs_swapper(struct rpc_xprt *xprt, int enable) 1940 { 1941 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1942 xprt); 1943 int err = 0; 1944 1945 if (enable) { 1946 xprt->swapper++; 1947 xs_set_memalloc(xprt); 1948 } else if (xprt->swapper) { 1949 xprt->swapper--; 1950 sk_clear_memalloc(transport->inet); 1951 } 1952 1953 return err; 1954 } 1955 EXPORT_SYMBOL_GPL(xs_swapper); 1956 #else 1957 static void xs_set_memalloc(struct rpc_xprt *xprt) 1958 { 1959 } 1960 #endif 1961 1962 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1963 { 1964 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1965 1966 if (!transport->inet) { 1967 struct sock *sk = sock->sk; 1968 1969 write_lock_bh(&sk->sk_callback_lock); 1970 1971 xs_save_old_callbacks(transport, sk); 1972 1973 sk->sk_user_data = xprt; 1974 sk->sk_data_ready = xs_udp_data_ready; 1975 sk->sk_write_space = xs_udp_write_space; 1976 sk->sk_no_check = UDP_CSUM_NORCV; 1977 sk->sk_allocation = GFP_ATOMIC; 1978 1979 xprt_set_connected(xprt); 1980 1981 /* Reset to new socket */ 1982 transport->sock = sock; 1983 transport->inet = sk; 1984 1985 xs_set_memalloc(xprt); 1986 1987 write_unlock_bh(&sk->sk_callback_lock); 1988 } 1989 xs_udp_do_set_buffer_size(xprt); 1990 } 1991 1992 static void xs_udp_setup_socket(struct work_struct *work) 1993 { 1994 struct sock_xprt *transport = 1995 container_of(work, struct sock_xprt, connect_worker.work); 1996 struct rpc_xprt *xprt = &transport->xprt; 1997 struct socket *sock = transport->sock; 1998 int status = -EIO; 1999 2000 current->flags |= PF_FSTRANS; 2001 2002 /* Start by resetting any existing state */ 2003 xs_reset_transport(transport); 2004 sock = xs_create_sock(xprt, transport, 2005 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 2006 if (IS_ERR(sock)) 2007 goto out; 2008 2009 dprintk("RPC: worker connecting xprt %p via %s to " 2010 "%s (port %s)\n", xprt, 2011 xprt->address_strings[RPC_DISPLAY_PROTO], 2012 xprt->address_strings[RPC_DISPLAY_ADDR], 2013 xprt->address_strings[RPC_DISPLAY_PORT]); 2014 2015 xs_udp_finish_connecting(xprt, sock); 2016 status = 0; 2017 out: 2018 xprt_clear_connecting(xprt); 2019 xprt_wake_pending_tasks(xprt, status); 2020 current->flags &= ~PF_FSTRANS; 2021 } 2022 2023 /* 2024 * We need to preserve the port number so the reply cache on the server can 2025 * find our cached RPC replies when we get around to reconnecting. 2026 */ 2027 static void xs_abort_connection(struct sock_xprt *transport) 2028 { 2029 int result; 2030 struct sockaddr any; 2031 2032 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2033 2034 /* 2035 * Disconnect the transport socket by doing a connect operation 2036 * with AF_UNSPEC. This should return immediately... 2037 */ 2038 memset(&any, 0, sizeof(any)); 2039 any.sa_family = AF_UNSPEC; 2040 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2041 if (!result) 2042 xs_sock_reset_connection_flags(&transport->xprt); 2043 dprintk("RPC: AF_UNSPEC connect return code %d\n", result); 2044 } 2045 2046 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2047 { 2048 unsigned int state = transport->inet->sk_state; 2049 2050 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2051 /* we don't need to abort the connection if the socket 2052 * hasn't undergone a shutdown 2053 */ 2054 if (transport->inet->sk_shutdown == 0) 2055 return; 2056 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2057 __func__, transport->inet->sk_shutdown); 2058 } 2059 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2060 /* we don't need to abort the connection if the socket 2061 * hasn't undergone a shutdown 2062 */ 2063 if (transport->inet->sk_shutdown == 0) 2064 return; 2065 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2066 "sk_shutdown set to %d\n", 2067 __func__, transport->inet->sk_shutdown); 2068 } 2069 xs_abort_connection(transport); 2070 } 2071 2072 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2073 { 2074 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2075 int ret = -ENOTCONN; 2076 2077 if (!transport->inet) { 2078 struct sock *sk = sock->sk; 2079 2080 write_lock_bh(&sk->sk_callback_lock); 2081 2082 xs_save_old_callbacks(transport, sk); 2083 2084 sk->sk_user_data = xprt; 2085 sk->sk_data_ready = xs_tcp_data_ready; 2086 sk->sk_state_change = xs_tcp_state_change; 2087 sk->sk_write_space = xs_tcp_write_space; 2088 sk->sk_allocation = GFP_ATOMIC; 2089 2090 /* socket options */ 2091 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2092 sock_reset_flag(sk, SOCK_LINGER); 2093 tcp_sk(sk)->linger2 = 0; 2094 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2095 2096 xprt_clear_connected(xprt); 2097 2098 /* Reset to new socket */ 2099 transport->sock = sock; 2100 transport->inet = sk; 2101 2102 write_unlock_bh(&sk->sk_callback_lock); 2103 } 2104 2105 if (!xprt_bound(xprt)) 2106 goto out; 2107 2108 xs_set_memalloc(xprt); 2109 2110 /* Tell the socket layer to start connecting... */ 2111 xprt->stat.connect_count++; 2112 xprt->stat.connect_start = jiffies; 2113 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2114 switch (ret) { 2115 case 0: 2116 case -EINPROGRESS: 2117 /* SYN_SENT! */ 2118 xprt->connect_cookie++; 2119 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2120 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2121 } 2122 out: 2123 return ret; 2124 } 2125 2126 /** 2127 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2128 * @xprt: RPC transport to connect 2129 * @transport: socket transport to connect 2130 * @create_sock: function to create a socket of the correct type 2131 * 2132 * Invoked by a work queue tasklet. 2133 */ 2134 static void xs_tcp_setup_socket(struct work_struct *work) 2135 { 2136 struct sock_xprt *transport = 2137 container_of(work, struct sock_xprt, connect_worker.work); 2138 struct socket *sock = transport->sock; 2139 struct rpc_xprt *xprt = &transport->xprt; 2140 int status = -EIO; 2141 2142 current->flags |= PF_FSTRANS; 2143 2144 if (!sock) { 2145 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2146 sock = xs_create_sock(xprt, transport, 2147 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2148 if (IS_ERR(sock)) { 2149 status = PTR_ERR(sock); 2150 goto out; 2151 } 2152 } else { 2153 int abort_and_exit; 2154 2155 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2156 &xprt->state); 2157 /* "close" the socket, preserving the local port */ 2158 xs_tcp_reuse_connection(transport); 2159 2160 if (abort_and_exit) 2161 goto out_eagain; 2162 } 2163 2164 dprintk("RPC: worker connecting xprt %p via %s to " 2165 "%s (port %s)\n", xprt, 2166 xprt->address_strings[RPC_DISPLAY_PROTO], 2167 xprt->address_strings[RPC_DISPLAY_ADDR], 2168 xprt->address_strings[RPC_DISPLAY_PORT]); 2169 2170 status = xs_tcp_finish_connecting(xprt, sock); 2171 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2172 xprt, -status, xprt_connected(xprt), 2173 sock->sk->sk_state); 2174 switch (status) { 2175 default: 2176 printk("%s: connect returned unhandled error %d\n", 2177 __func__, status); 2178 case -EADDRNOTAVAIL: 2179 /* We're probably in TIME_WAIT. Get rid of existing socket, 2180 * and retry 2181 */ 2182 xs_tcp_force_close(xprt); 2183 break; 2184 case -ECONNREFUSED: 2185 case -ECONNRESET: 2186 case -ENETUNREACH: 2187 /* retry with existing socket, after a delay */ 2188 case 0: 2189 case -EINPROGRESS: 2190 case -EALREADY: 2191 xprt_clear_connecting(xprt); 2192 current->flags &= ~PF_FSTRANS; 2193 return; 2194 case -EINVAL: 2195 /* Happens, for instance, if the user specified a link 2196 * local IPv6 address without a scope-id. 2197 */ 2198 goto out; 2199 } 2200 out_eagain: 2201 status = -EAGAIN; 2202 out: 2203 xprt_clear_connecting(xprt); 2204 xprt_wake_pending_tasks(xprt, status); 2205 current->flags &= ~PF_FSTRANS; 2206 } 2207 2208 /** 2209 * xs_connect - connect a socket to a remote endpoint 2210 * @xprt: pointer to transport structure 2211 * @task: address of RPC task that manages state of connect request 2212 * 2213 * TCP: If the remote end dropped the connection, delay reconnecting. 2214 * 2215 * UDP socket connects are synchronous, but we use a work queue anyway 2216 * to guarantee that even unprivileged user processes can set up a 2217 * socket on a privileged port. 2218 * 2219 * If a UDP socket connect fails, the delay behavior here prevents 2220 * retry floods (hard mounts). 2221 */ 2222 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2223 { 2224 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2225 2226 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2227 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2228 "seconds\n", 2229 xprt, xprt->reestablish_timeout / HZ); 2230 queue_delayed_work(rpciod_workqueue, 2231 &transport->connect_worker, 2232 xprt->reestablish_timeout); 2233 xprt->reestablish_timeout <<= 1; 2234 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2235 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2236 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2237 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2238 } else { 2239 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2240 queue_delayed_work(rpciod_workqueue, 2241 &transport->connect_worker, 0); 2242 } 2243 } 2244 2245 /** 2246 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2247 * @xprt: rpc_xprt struct containing statistics 2248 * @seq: output file 2249 * 2250 */ 2251 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2252 { 2253 long idle_time = 0; 2254 2255 if (xprt_connected(xprt)) 2256 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2257 2258 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2259 "%llu %llu %lu %llu %llu\n", 2260 xprt->stat.bind_count, 2261 xprt->stat.connect_count, 2262 xprt->stat.connect_time, 2263 idle_time, 2264 xprt->stat.sends, 2265 xprt->stat.recvs, 2266 xprt->stat.bad_xids, 2267 xprt->stat.req_u, 2268 xprt->stat.bklog_u, 2269 xprt->stat.max_slots, 2270 xprt->stat.sending_u, 2271 xprt->stat.pending_u); 2272 } 2273 2274 /** 2275 * xs_udp_print_stats - display UDP socket-specifc stats 2276 * @xprt: rpc_xprt struct containing statistics 2277 * @seq: output file 2278 * 2279 */ 2280 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2281 { 2282 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2283 2284 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2285 "%lu %llu %llu\n", 2286 transport->srcport, 2287 xprt->stat.bind_count, 2288 xprt->stat.sends, 2289 xprt->stat.recvs, 2290 xprt->stat.bad_xids, 2291 xprt->stat.req_u, 2292 xprt->stat.bklog_u, 2293 xprt->stat.max_slots, 2294 xprt->stat.sending_u, 2295 xprt->stat.pending_u); 2296 } 2297 2298 /** 2299 * xs_tcp_print_stats - display TCP socket-specifc stats 2300 * @xprt: rpc_xprt struct containing statistics 2301 * @seq: output file 2302 * 2303 */ 2304 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2305 { 2306 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2307 long idle_time = 0; 2308 2309 if (xprt_connected(xprt)) 2310 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2311 2312 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2313 "%llu %llu %lu %llu %llu\n", 2314 transport->srcport, 2315 xprt->stat.bind_count, 2316 xprt->stat.connect_count, 2317 xprt->stat.connect_time, 2318 idle_time, 2319 xprt->stat.sends, 2320 xprt->stat.recvs, 2321 xprt->stat.bad_xids, 2322 xprt->stat.req_u, 2323 xprt->stat.bklog_u, 2324 xprt->stat.max_slots, 2325 xprt->stat.sending_u, 2326 xprt->stat.pending_u); 2327 } 2328 2329 /* 2330 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2331 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2332 * to use the server side send routines. 2333 */ 2334 static void *bc_malloc(struct rpc_task *task, size_t size) 2335 { 2336 struct page *page; 2337 struct rpc_buffer *buf; 2338 2339 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2340 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2341 return NULL; 2342 2343 page = alloc_page(GFP_KERNEL); 2344 if (!page) 2345 return NULL; 2346 2347 buf = page_address(page); 2348 buf->len = PAGE_SIZE; 2349 2350 return buf->data; 2351 } 2352 2353 /* 2354 * Free the space allocated in the bc_alloc routine 2355 */ 2356 static void bc_free(void *buffer) 2357 { 2358 struct rpc_buffer *buf; 2359 2360 if (!buffer) 2361 return; 2362 2363 buf = container_of(buffer, struct rpc_buffer, data); 2364 free_page((unsigned long)buf); 2365 } 2366 2367 /* 2368 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2369 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2370 */ 2371 static int bc_sendto(struct rpc_rqst *req) 2372 { 2373 int len; 2374 struct xdr_buf *xbufp = &req->rq_snd_buf; 2375 struct rpc_xprt *xprt = req->rq_xprt; 2376 struct sock_xprt *transport = 2377 container_of(xprt, struct sock_xprt, xprt); 2378 struct socket *sock = transport->sock; 2379 unsigned long headoff; 2380 unsigned long tailoff; 2381 2382 xs_encode_stream_record_marker(xbufp); 2383 2384 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2385 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2386 len = svc_send_common(sock, xbufp, 2387 virt_to_page(xbufp->head[0].iov_base), headoff, 2388 xbufp->tail[0].iov_base, tailoff); 2389 2390 if (len != xbufp->len) { 2391 printk(KERN_NOTICE "Error sending entire callback!\n"); 2392 len = -EAGAIN; 2393 } 2394 2395 return len; 2396 } 2397 2398 /* 2399 * The send routine. Borrows from svc_send 2400 */ 2401 static int bc_send_request(struct rpc_task *task) 2402 { 2403 struct rpc_rqst *req = task->tk_rqstp; 2404 struct svc_xprt *xprt; 2405 u32 len; 2406 2407 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2408 /* 2409 * Get the server socket associated with this callback xprt 2410 */ 2411 xprt = req->rq_xprt->bc_xprt; 2412 2413 /* 2414 * Grab the mutex to serialize data as the connection is shared 2415 * with the fore channel 2416 */ 2417 if (!mutex_trylock(&xprt->xpt_mutex)) { 2418 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2419 if (!mutex_trylock(&xprt->xpt_mutex)) 2420 return -EAGAIN; 2421 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2422 } 2423 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2424 len = -ENOTCONN; 2425 else 2426 len = bc_sendto(req); 2427 mutex_unlock(&xprt->xpt_mutex); 2428 2429 if (len > 0) 2430 len = 0; 2431 2432 return len; 2433 } 2434 2435 /* 2436 * The close routine. Since this is client initiated, we do nothing 2437 */ 2438 2439 static void bc_close(struct rpc_xprt *xprt) 2440 { 2441 } 2442 2443 /* 2444 * The xprt destroy routine. Again, because this connection is client 2445 * initiated, we do nothing 2446 */ 2447 2448 static void bc_destroy(struct rpc_xprt *xprt) 2449 { 2450 } 2451 2452 static struct rpc_xprt_ops xs_local_ops = { 2453 .reserve_xprt = xprt_reserve_xprt, 2454 .release_xprt = xs_tcp_release_xprt, 2455 .alloc_slot = xprt_alloc_slot, 2456 .rpcbind = xs_local_rpcbind, 2457 .set_port = xs_local_set_port, 2458 .connect = xs_connect, 2459 .buf_alloc = rpc_malloc, 2460 .buf_free = rpc_free, 2461 .send_request = xs_local_send_request, 2462 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2463 .close = xs_close, 2464 .destroy = xs_destroy, 2465 .print_stats = xs_local_print_stats, 2466 }; 2467 2468 static struct rpc_xprt_ops xs_udp_ops = { 2469 .set_buffer_size = xs_udp_set_buffer_size, 2470 .reserve_xprt = xprt_reserve_xprt_cong, 2471 .release_xprt = xprt_release_xprt_cong, 2472 .alloc_slot = xprt_alloc_slot, 2473 .rpcbind = rpcb_getport_async, 2474 .set_port = xs_set_port, 2475 .connect = xs_connect, 2476 .buf_alloc = rpc_malloc, 2477 .buf_free = rpc_free, 2478 .send_request = xs_udp_send_request, 2479 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2480 .timer = xs_udp_timer, 2481 .release_request = xprt_release_rqst_cong, 2482 .close = xs_close, 2483 .destroy = xs_destroy, 2484 .print_stats = xs_udp_print_stats, 2485 }; 2486 2487 static struct rpc_xprt_ops xs_tcp_ops = { 2488 .reserve_xprt = xprt_reserve_xprt, 2489 .release_xprt = xs_tcp_release_xprt, 2490 .alloc_slot = xprt_lock_and_alloc_slot, 2491 .rpcbind = rpcb_getport_async, 2492 .set_port = xs_set_port, 2493 .connect = xs_connect, 2494 .buf_alloc = rpc_malloc, 2495 .buf_free = rpc_free, 2496 .send_request = xs_tcp_send_request, 2497 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2498 .close = xs_tcp_close, 2499 .destroy = xs_destroy, 2500 .print_stats = xs_tcp_print_stats, 2501 }; 2502 2503 /* 2504 * The rpc_xprt_ops for the server backchannel 2505 */ 2506 2507 static struct rpc_xprt_ops bc_tcp_ops = { 2508 .reserve_xprt = xprt_reserve_xprt, 2509 .release_xprt = xprt_release_xprt, 2510 .alloc_slot = xprt_alloc_slot, 2511 .rpcbind = xs_local_rpcbind, 2512 .buf_alloc = bc_malloc, 2513 .buf_free = bc_free, 2514 .send_request = bc_send_request, 2515 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2516 .close = bc_close, 2517 .destroy = bc_destroy, 2518 .print_stats = xs_tcp_print_stats, 2519 }; 2520 2521 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2522 { 2523 static const struct sockaddr_in sin = { 2524 .sin_family = AF_INET, 2525 .sin_addr.s_addr = htonl(INADDR_ANY), 2526 }; 2527 static const struct sockaddr_in6 sin6 = { 2528 .sin6_family = AF_INET6, 2529 .sin6_addr = IN6ADDR_ANY_INIT, 2530 }; 2531 2532 switch (family) { 2533 case AF_LOCAL: 2534 break; 2535 case AF_INET: 2536 memcpy(sap, &sin, sizeof(sin)); 2537 break; 2538 case AF_INET6: 2539 memcpy(sap, &sin6, sizeof(sin6)); 2540 break; 2541 default: 2542 dprintk("RPC: %s: Bad address family\n", __func__); 2543 return -EAFNOSUPPORT; 2544 } 2545 return 0; 2546 } 2547 2548 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2549 unsigned int slot_table_size, 2550 unsigned int max_slot_table_size) 2551 { 2552 struct rpc_xprt *xprt; 2553 struct sock_xprt *new; 2554 2555 if (args->addrlen > sizeof(xprt->addr)) { 2556 dprintk("RPC: xs_setup_xprt: address too large\n"); 2557 return ERR_PTR(-EBADF); 2558 } 2559 2560 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2561 max_slot_table_size); 2562 if (xprt == NULL) { 2563 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2564 "rpc_xprt\n"); 2565 return ERR_PTR(-ENOMEM); 2566 } 2567 2568 new = container_of(xprt, struct sock_xprt, xprt); 2569 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2570 xprt->addrlen = args->addrlen; 2571 if (args->srcaddr) 2572 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2573 else { 2574 int err; 2575 err = xs_init_anyaddr(args->dstaddr->sa_family, 2576 (struct sockaddr *)&new->srcaddr); 2577 if (err != 0) { 2578 xprt_free(xprt); 2579 return ERR_PTR(err); 2580 } 2581 } 2582 2583 return xprt; 2584 } 2585 2586 static const struct rpc_timeout xs_local_default_timeout = { 2587 .to_initval = 10 * HZ, 2588 .to_maxval = 10 * HZ, 2589 .to_retries = 2, 2590 }; 2591 2592 /** 2593 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2594 * @args: rpc transport creation arguments 2595 * 2596 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2597 */ 2598 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2599 { 2600 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2601 struct sock_xprt *transport; 2602 struct rpc_xprt *xprt; 2603 struct rpc_xprt *ret; 2604 2605 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2606 xprt_max_tcp_slot_table_entries); 2607 if (IS_ERR(xprt)) 2608 return xprt; 2609 transport = container_of(xprt, struct sock_xprt, xprt); 2610 2611 xprt->prot = 0; 2612 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2613 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2614 2615 xprt->bind_timeout = XS_BIND_TO; 2616 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2617 xprt->idle_timeout = XS_IDLE_DISC_TO; 2618 2619 xprt->ops = &xs_local_ops; 2620 xprt->timeout = &xs_local_default_timeout; 2621 2622 switch (sun->sun_family) { 2623 case AF_LOCAL: 2624 if (sun->sun_path[0] != '/') { 2625 dprintk("RPC: bad AF_LOCAL address: %s\n", 2626 sun->sun_path); 2627 ret = ERR_PTR(-EINVAL); 2628 goto out_err; 2629 } 2630 xprt_set_bound(xprt); 2631 INIT_DELAYED_WORK(&transport->connect_worker, 2632 xs_local_setup_socket); 2633 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2634 break; 2635 default: 2636 ret = ERR_PTR(-EAFNOSUPPORT); 2637 goto out_err; 2638 } 2639 2640 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2641 xprt->address_strings[RPC_DISPLAY_ADDR]); 2642 2643 if (try_module_get(THIS_MODULE)) 2644 return xprt; 2645 ret = ERR_PTR(-EINVAL); 2646 out_err: 2647 xprt_free(xprt); 2648 return ret; 2649 } 2650 2651 static const struct rpc_timeout xs_udp_default_timeout = { 2652 .to_initval = 5 * HZ, 2653 .to_maxval = 30 * HZ, 2654 .to_increment = 5 * HZ, 2655 .to_retries = 5, 2656 }; 2657 2658 /** 2659 * xs_setup_udp - Set up transport to use a UDP socket 2660 * @args: rpc transport creation arguments 2661 * 2662 */ 2663 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2664 { 2665 struct sockaddr *addr = args->dstaddr; 2666 struct rpc_xprt *xprt; 2667 struct sock_xprt *transport; 2668 struct rpc_xprt *ret; 2669 2670 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2671 xprt_udp_slot_table_entries); 2672 if (IS_ERR(xprt)) 2673 return xprt; 2674 transport = container_of(xprt, struct sock_xprt, xprt); 2675 2676 xprt->prot = IPPROTO_UDP; 2677 xprt->tsh_size = 0; 2678 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2679 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2680 2681 xprt->bind_timeout = XS_BIND_TO; 2682 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2683 xprt->idle_timeout = XS_IDLE_DISC_TO; 2684 2685 xprt->ops = &xs_udp_ops; 2686 2687 xprt->timeout = &xs_udp_default_timeout; 2688 2689 switch (addr->sa_family) { 2690 case AF_INET: 2691 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2692 xprt_set_bound(xprt); 2693 2694 INIT_DELAYED_WORK(&transport->connect_worker, 2695 xs_udp_setup_socket); 2696 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2697 break; 2698 case AF_INET6: 2699 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2700 xprt_set_bound(xprt); 2701 2702 INIT_DELAYED_WORK(&transport->connect_worker, 2703 xs_udp_setup_socket); 2704 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2705 break; 2706 default: 2707 ret = ERR_PTR(-EAFNOSUPPORT); 2708 goto out_err; 2709 } 2710 2711 if (xprt_bound(xprt)) 2712 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2713 xprt->address_strings[RPC_DISPLAY_ADDR], 2714 xprt->address_strings[RPC_DISPLAY_PORT], 2715 xprt->address_strings[RPC_DISPLAY_PROTO]); 2716 else 2717 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2718 xprt->address_strings[RPC_DISPLAY_ADDR], 2719 xprt->address_strings[RPC_DISPLAY_PROTO]); 2720 2721 if (try_module_get(THIS_MODULE)) 2722 return xprt; 2723 ret = ERR_PTR(-EINVAL); 2724 out_err: 2725 xprt_free(xprt); 2726 return ret; 2727 } 2728 2729 static const struct rpc_timeout xs_tcp_default_timeout = { 2730 .to_initval = 60 * HZ, 2731 .to_maxval = 60 * HZ, 2732 .to_retries = 2, 2733 }; 2734 2735 /** 2736 * xs_setup_tcp - Set up transport to use a TCP socket 2737 * @args: rpc transport creation arguments 2738 * 2739 */ 2740 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2741 { 2742 struct sockaddr *addr = args->dstaddr; 2743 struct rpc_xprt *xprt; 2744 struct sock_xprt *transport; 2745 struct rpc_xprt *ret; 2746 2747 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2748 xprt_max_tcp_slot_table_entries); 2749 if (IS_ERR(xprt)) 2750 return xprt; 2751 transport = container_of(xprt, struct sock_xprt, xprt); 2752 2753 xprt->prot = IPPROTO_TCP; 2754 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2755 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2756 2757 xprt->bind_timeout = XS_BIND_TO; 2758 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2759 xprt->idle_timeout = XS_IDLE_DISC_TO; 2760 2761 xprt->ops = &xs_tcp_ops; 2762 xprt->timeout = &xs_tcp_default_timeout; 2763 2764 switch (addr->sa_family) { 2765 case AF_INET: 2766 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2767 xprt_set_bound(xprt); 2768 2769 INIT_DELAYED_WORK(&transport->connect_worker, 2770 xs_tcp_setup_socket); 2771 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2772 break; 2773 case AF_INET6: 2774 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2775 xprt_set_bound(xprt); 2776 2777 INIT_DELAYED_WORK(&transport->connect_worker, 2778 xs_tcp_setup_socket); 2779 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2780 break; 2781 default: 2782 ret = ERR_PTR(-EAFNOSUPPORT); 2783 goto out_err; 2784 } 2785 2786 if (xprt_bound(xprt)) 2787 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2788 xprt->address_strings[RPC_DISPLAY_ADDR], 2789 xprt->address_strings[RPC_DISPLAY_PORT], 2790 xprt->address_strings[RPC_DISPLAY_PROTO]); 2791 else 2792 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2793 xprt->address_strings[RPC_DISPLAY_ADDR], 2794 xprt->address_strings[RPC_DISPLAY_PROTO]); 2795 2796 2797 if (try_module_get(THIS_MODULE)) 2798 return xprt; 2799 ret = ERR_PTR(-EINVAL); 2800 out_err: 2801 xprt_free(xprt); 2802 return ret; 2803 } 2804 2805 /** 2806 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2807 * @args: rpc transport creation arguments 2808 * 2809 */ 2810 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2811 { 2812 struct sockaddr *addr = args->dstaddr; 2813 struct rpc_xprt *xprt; 2814 struct sock_xprt *transport; 2815 struct svc_sock *bc_sock; 2816 struct rpc_xprt *ret; 2817 2818 if (args->bc_xprt->xpt_bc_xprt) { 2819 /* 2820 * This server connection already has a backchannel 2821 * export; we can't create a new one, as we wouldn't be 2822 * able to match replies based on xid any more. So, 2823 * reuse the already-existing one: 2824 */ 2825 return args->bc_xprt->xpt_bc_xprt; 2826 } 2827 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2828 xprt_tcp_slot_table_entries); 2829 if (IS_ERR(xprt)) 2830 return xprt; 2831 transport = container_of(xprt, struct sock_xprt, xprt); 2832 2833 xprt->prot = IPPROTO_TCP; 2834 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2835 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2836 xprt->timeout = &xs_tcp_default_timeout; 2837 2838 /* backchannel */ 2839 xprt_set_bound(xprt); 2840 xprt->bind_timeout = 0; 2841 xprt->reestablish_timeout = 0; 2842 xprt->idle_timeout = 0; 2843 2844 xprt->ops = &bc_tcp_ops; 2845 2846 switch (addr->sa_family) { 2847 case AF_INET: 2848 xs_format_peer_addresses(xprt, "tcp", 2849 RPCBIND_NETID_TCP); 2850 break; 2851 case AF_INET6: 2852 xs_format_peer_addresses(xprt, "tcp", 2853 RPCBIND_NETID_TCP6); 2854 break; 2855 default: 2856 ret = ERR_PTR(-EAFNOSUPPORT); 2857 goto out_err; 2858 } 2859 2860 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2861 xprt->address_strings[RPC_DISPLAY_ADDR], 2862 xprt->address_strings[RPC_DISPLAY_PORT], 2863 xprt->address_strings[RPC_DISPLAY_PROTO]); 2864 2865 /* 2866 * Once we've associated a backchannel xprt with a connection, 2867 * we want to keep it around as long as long as the connection 2868 * lasts, in case we need to start using it for a backchannel 2869 * again; this reference won't be dropped until bc_xprt is 2870 * destroyed. 2871 */ 2872 xprt_get(xprt); 2873 args->bc_xprt->xpt_bc_xprt = xprt; 2874 xprt->bc_xprt = args->bc_xprt; 2875 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2876 transport->sock = bc_sock->sk_sock; 2877 transport->inet = bc_sock->sk_sk; 2878 2879 /* 2880 * Since we don't want connections for the backchannel, we set 2881 * the xprt status to connected 2882 */ 2883 xprt_set_connected(xprt); 2884 2885 2886 if (try_module_get(THIS_MODULE)) 2887 return xprt; 2888 xprt_put(xprt); 2889 ret = ERR_PTR(-EINVAL); 2890 out_err: 2891 xprt_free(xprt); 2892 return ret; 2893 } 2894 2895 static struct xprt_class xs_local_transport = { 2896 .list = LIST_HEAD_INIT(xs_local_transport.list), 2897 .name = "named UNIX socket", 2898 .owner = THIS_MODULE, 2899 .ident = XPRT_TRANSPORT_LOCAL, 2900 .setup = xs_setup_local, 2901 }; 2902 2903 static struct xprt_class xs_udp_transport = { 2904 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2905 .name = "udp", 2906 .owner = THIS_MODULE, 2907 .ident = XPRT_TRANSPORT_UDP, 2908 .setup = xs_setup_udp, 2909 }; 2910 2911 static struct xprt_class xs_tcp_transport = { 2912 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2913 .name = "tcp", 2914 .owner = THIS_MODULE, 2915 .ident = XPRT_TRANSPORT_TCP, 2916 .setup = xs_setup_tcp, 2917 }; 2918 2919 static struct xprt_class xs_bc_tcp_transport = { 2920 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2921 .name = "tcp NFSv4.1 backchannel", 2922 .owner = THIS_MODULE, 2923 .ident = XPRT_TRANSPORT_BC_TCP, 2924 .setup = xs_setup_bc_tcp, 2925 }; 2926 2927 /** 2928 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2929 * 2930 */ 2931 int init_socket_xprt(void) 2932 { 2933 #ifdef RPC_DEBUG 2934 if (!sunrpc_table_header) 2935 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2936 #endif 2937 2938 xprt_register_transport(&xs_local_transport); 2939 xprt_register_transport(&xs_udp_transport); 2940 xprt_register_transport(&xs_tcp_transport); 2941 xprt_register_transport(&xs_bc_tcp_transport); 2942 2943 return 0; 2944 } 2945 2946 /** 2947 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2948 * 2949 */ 2950 void cleanup_socket_xprt(void) 2951 { 2952 #ifdef RPC_DEBUG 2953 if (sunrpc_table_header) { 2954 unregister_sysctl_table(sunrpc_table_header); 2955 sunrpc_table_header = NULL; 2956 } 2957 #endif 2958 2959 xprt_unregister_transport(&xs_local_transport); 2960 xprt_unregister_transport(&xs_udp_transport); 2961 xprt_unregister_transport(&xs_tcp_transport); 2962 xprt_unregister_transport(&xs_bc_tcp_transport); 2963 } 2964 2965 static int param_set_uint_minmax(const char *val, 2966 const struct kernel_param *kp, 2967 unsigned int min, unsigned int max) 2968 { 2969 unsigned long num; 2970 int ret; 2971 2972 if (!val) 2973 return -EINVAL; 2974 ret = strict_strtoul(val, 0, &num); 2975 if (ret == -EINVAL || num < min || num > max) 2976 return -EINVAL; 2977 *((unsigned int *)kp->arg) = num; 2978 return 0; 2979 } 2980 2981 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2982 { 2983 return param_set_uint_minmax(val, kp, 2984 RPC_MIN_RESVPORT, 2985 RPC_MAX_RESVPORT); 2986 } 2987 2988 static struct kernel_param_ops param_ops_portnr = { 2989 .set = param_set_portnr, 2990 .get = param_get_uint, 2991 }; 2992 2993 #define param_check_portnr(name, p) \ 2994 __param_check(name, p, unsigned int); 2995 2996 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 2997 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 2998 2999 static int param_set_slot_table_size(const char *val, 3000 const struct kernel_param *kp) 3001 { 3002 return param_set_uint_minmax(val, kp, 3003 RPC_MIN_SLOT_TABLE, 3004 RPC_MAX_SLOT_TABLE); 3005 } 3006 3007 static struct kernel_param_ops param_ops_slot_table_size = { 3008 .set = param_set_slot_table_size, 3009 .get = param_get_uint, 3010 }; 3011 3012 #define param_check_slot_table_size(name, p) \ 3013 __param_check(name, p, unsigned int); 3014 3015 static int param_set_max_slot_table_size(const char *val, 3016 const struct kernel_param *kp) 3017 { 3018 return param_set_uint_minmax(val, kp, 3019 RPC_MIN_SLOT_TABLE, 3020 RPC_MAX_SLOT_TABLE_LIMIT); 3021 } 3022 3023 static struct kernel_param_ops param_ops_max_slot_table_size = { 3024 .set = param_set_max_slot_table_size, 3025 .get = param_get_uint, 3026 }; 3027 3028 #define param_check_max_slot_table_size(name, p) \ 3029 __param_check(name, p, unsigned int); 3030 3031 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3032 slot_table_size, 0644); 3033 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3034 max_slot_table_size, 0644); 3035 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3036 slot_table_size, 0644); 3037 3038