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/addr.h> 37 #include <linux/sunrpc/sched.h> 38 #include <linux/sunrpc/svcsock.h> 39 #include <linux/sunrpc/xprtsock.h> 40 #include <linux/file.h> 41 #ifdef CONFIG_SUNRPC_BACKCHANNEL 42 #include <linux/sunrpc/bc_xprt.h> 43 #endif 44 45 #include <net/sock.h> 46 #include <net/checksum.h> 47 #include <net/udp.h> 48 #include <net/tcp.h> 49 50 #include <trace/events/sunrpc.h> 51 52 #include "sunrpc.h" 53 54 static void xs_close(struct rpc_xprt *xprt); 55 56 /* 57 * xprtsock tunables 58 */ 59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 62 63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 65 66 #define XS_TCP_LINGER_TO (15U * HZ) 67 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 68 69 /* 70 * We can register our own files under /proc/sys/sunrpc by 71 * calling register_sysctl_table() again. The files in that 72 * directory become the union of all files registered there. 73 * 74 * We simply need to make sure that we don't collide with 75 * someone else's file names! 76 */ 77 78 #ifdef RPC_DEBUG 79 80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 85 86 static struct ctl_table_header *sunrpc_table_header; 87 88 /* 89 * FIXME: changing the UDP slot table size should also resize the UDP 90 * socket buffers for existing UDP transports 91 */ 92 static struct ctl_table xs_tunables_table[] = { 93 { 94 .procname = "udp_slot_table_entries", 95 .data = &xprt_udp_slot_table_entries, 96 .maxlen = sizeof(unsigned int), 97 .mode = 0644, 98 .proc_handler = proc_dointvec_minmax, 99 .extra1 = &min_slot_table_size, 100 .extra2 = &max_slot_table_size 101 }, 102 { 103 .procname = "tcp_slot_table_entries", 104 .data = &xprt_tcp_slot_table_entries, 105 .maxlen = sizeof(unsigned int), 106 .mode = 0644, 107 .proc_handler = proc_dointvec_minmax, 108 .extra1 = &min_slot_table_size, 109 .extra2 = &max_slot_table_size 110 }, 111 { 112 .procname = "tcp_max_slot_table_entries", 113 .data = &xprt_max_tcp_slot_table_entries, 114 .maxlen = sizeof(unsigned int), 115 .mode = 0644, 116 .proc_handler = proc_dointvec_minmax, 117 .extra1 = &min_slot_table_size, 118 .extra2 = &max_tcp_slot_table_limit 119 }, 120 { 121 .procname = "min_resvport", 122 .data = &xprt_min_resvport, 123 .maxlen = sizeof(unsigned int), 124 .mode = 0644, 125 .proc_handler = proc_dointvec_minmax, 126 .extra1 = &xprt_min_resvport_limit, 127 .extra2 = &xprt_max_resvport_limit 128 }, 129 { 130 .procname = "max_resvport", 131 .data = &xprt_max_resvport, 132 .maxlen = sizeof(unsigned int), 133 .mode = 0644, 134 .proc_handler = proc_dointvec_minmax, 135 .extra1 = &xprt_min_resvport_limit, 136 .extra2 = &xprt_max_resvport_limit 137 }, 138 { 139 .procname = "tcp_fin_timeout", 140 .data = &xs_tcp_fin_timeout, 141 .maxlen = sizeof(xs_tcp_fin_timeout), 142 .mode = 0644, 143 .proc_handler = proc_dointvec_jiffies, 144 }, 145 { }, 146 }; 147 148 static struct ctl_table sunrpc_table[] = { 149 { 150 .procname = "sunrpc", 151 .mode = 0555, 152 .child = xs_tunables_table 153 }, 154 { }, 155 }; 156 157 #endif 158 159 /* 160 * Wait duration for a reply from the RPC portmapper. 161 */ 162 #define XS_BIND_TO (60U * HZ) 163 164 /* 165 * Delay if a UDP socket connect error occurs. This is most likely some 166 * kind of resource problem on the local host. 167 */ 168 #define XS_UDP_REEST_TO (2U * HZ) 169 170 /* 171 * The reestablish timeout allows clients to delay for a bit before attempting 172 * to reconnect to a server that just dropped our connection. 173 * 174 * We implement an exponential backoff when trying to reestablish a TCP 175 * transport connection with the server. Some servers like to drop a TCP 176 * connection when they are overworked, so we start with a short timeout and 177 * increase over time if the server is down or not responding. 178 */ 179 #define XS_TCP_INIT_REEST_TO (3U * HZ) 180 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 181 182 /* 183 * TCP idle timeout; client drops the transport socket if it is idle 184 * for this long. Note that we also timeout UDP sockets to prevent 185 * holding port numbers when there is no RPC traffic. 186 */ 187 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 188 189 #ifdef RPC_DEBUG 190 # undef RPC_DEBUG_DATA 191 # define RPCDBG_FACILITY RPCDBG_TRANS 192 #endif 193 194 #ifdef RPC_DEBUG_DATA 195 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 196 { 197 u8 *buf = (u8 *) packet; 198 int j; 199 200 dprintk("RPC: %s\n", msg); 201 for (j = 0; j < count && j < 128; j += 4) { 202 if (!(j & 31)) { 203 if (j) 204 dprintk("\n"); 205 dprintk("0x%04x ", j); 206 } 207 dprintk("%02x%02x%02x%02x ", 208 buf[j], buf[j+1], buf[j+2], buf[j+3]); 209 } 210 dprintk("\n"); 211 } 212 #else 213 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 214 { 215 /* NOP */ 216 } 217 #endif 218 219 struct sock_xprt { 220 struct rpc_xprt xprt; 221 222 /* 223 * Network layer 224 */ 225 struct socket * sock; 226 struct sock * inet; 227 228 /* 229 * State of TCP reply receive 230 */ 231 __be32 tcp_fraghdr, 232 tcp_xid, 233 tcp_calldir; 234 235 u32 tcp_offset, 236 tcp_reclen; 237 238 unsigned long tcp_copied, 239 tcp_flags; 240 241 /* 242 * Connection of transports 243 */ 244 struct delayed_work connect_worker; 245 struct sockaddr_storage srcaddr; 246 unsigned short srcport; 247 248 /* 249 * UDP socket buffer size parameters 250 */ 251 size_t rcvsize, 252 sndsize; 253 254 /* 255 * Saved socket callback addresses 256 */ 257 void (*old_data_ready)(struct sock *, int); 258 void (*old_state_change)(struct sock *); 259 void (*old_write_space)(struct sock *); 260 }; 261 262 /* 263 * TCP receive state flags 264 */ 265 #define TCP_RCV_LAST_FRAG (1UL << 0) 266 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 267 #define TCP_RCV_COPY_XID (1UL << 2) 268 #define TCP_RCV_COPY_DATA (1UL << 3) 269 #define TCP_RCV_READ_CALLDIR (1UL << 4) 270 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 271 272 /* 273 * TCP RPC flags 274 */ 275 #define TCP_RPC_REPLY (1UL << 6) 276 277 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 278 { 279 return (struct sockaddr *) &xprt->addr; 280 } 281 282 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 283 { 284 return (struct sockaddr_un *) &xprt->addr; 285 } 286 287 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 288 { 289 return (struct sockaddr_in *) &xprt->addr; 290 } 291 292 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 293 { 294 return (struct sockaddr_in6 *) &xprt->addr; 295 } 296 297 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 298 { 299 struct sockaddr *sap = xs_addr(xprt); 300 struct sockaddr_in6 *sin6; 301 struct sockaddr_in *sin; 302 struct sockaddr_un *sun; 303 char buf[128]; 304 305 switch (sap->sa_family) { 306 case AF_LOCAL: 307 sun = xs_addr_un(xprt); 308 strlcpy(buf, sun->sun_path, sizeof(buf)); 309 xprt->address_strings[RPC_DISPLAY_ADDR] = 310 kstrdup(buf, GFP_KERNEL); 311 break; 312 case AF_INET: 313 (void)rpc_ntop(sap, buf, sizeof(buf)); 314 xprt->address_strings[RPC_DISPLAY_ADDR] = 315 kstrdup(buf, GFP_KERNEL); 316 sin = xs_addr_in(xprt); 317 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 318 break; 319 case AF_INET6: 320 (void)rpc_ntop(sap, buf, sizeof(buf)); 321 xprt->address_strings[RPC_DISPLAY_ADDR] = 322 kstrdup(buf, GFP_KERNEL); 323 sin6 = xs_addr_in6(xprt); 324 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 325 break; 326 default: 327 BUG(); 328 } 329 330 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 331 } 332 333 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 334 { 335 struct sockaddr *sap = xs_addr(xprt); 336 char buf[128]; 337 338 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 339 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 340 341 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 342 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 343 } 344 345 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 346 const char *protocol, 347 const char *netid) 348 { 349 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 350 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 351 xs_format_common_peer_addresses(xprt); 352 xs_format_common_peer_ports(xprt); 353 } 354 355 static void xs_update_peer_port(struct rpc_xprt *xprt) 356 { 357 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 358 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 359 360 xs_format_common_peer_ports(xprt); 361 } 362 363 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 364 { 365 unsigned int i; 366 367 for (i = 0; i < RPC_DISPLAY_MAX; i++) 368 switch (i) { 369 case RPC_DISPLAY_PROTO: 370 case RPC_DISPLAY_NETID: 371 continue; 372 default: 373 kfree(xprt->address_strings[i]); 374 } 375 } 376 377 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 378 379 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 380 { 381 struct msghdr msg = { 382 .msg_name = addr, 383 .msg_namelen = addrlen, 384 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 385 }; 386 struct kvec iov = { 387 .iov_base = vec->iov_base + base, 388 .iov_len = vec->iov_len - base, 389 }; 390 391 if (iov.iov_len != 0) 392 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 393 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 394 } 395 396 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 397 { 398 struct page **ppage; 399 unsigned int remainder; 400 int err, sent = 0; 401 402 remainder = xdr->page_len - base; 403 base += xdr->page_base; 404 ppage = xdr->pages + (base >> PAGE_SHIFT); 405 base &= ~PAGE_MASK; 406 for(;;) { 407 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 408 int flags = XS_SENDMSG_FLAGS; 409 410 remainder -= len; 411 if (remainder != 0 || more) 412 flags |= MSG_MORE; 413 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 414 if (remainder == 0 || err != len) 415 break; 416 sent += err; 417 ppage++; 418 base = 0; 419 } 420 if (sent == 0) 421 return err; 422 if (err > 0) 423 sent += err; 424 return sent; 425 } 426 427 /** 428 * xs_sendpages - write pages directly to a socket 429 * @sock: socket to send on 430 * @addr: UDP only -- address of destination 431 * @addrlen: UDP only -- length of destination address 432 * @xdr: buffer containing this request 433 * @base: starting position in the buffer 434 * 435 */ 436 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 437 { 438 unsigned int remainder = xdr->len - base; 439 int err, sent = 0; 440 441 if (unlikely(!sock)) 442 return -ENOTSOCK; 443 444 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 445 if (base != 0) { 446 addr = NULL; 447 addrlen = 0; 448 } 449 450 if (base < xdr->head[0].iov_len || addr != NULL) { 451 unsigned int len = xdr->head[0].iov_len - base; 452 remainder -= len; 453 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 454 if (remainder == 0 || err != len) 455 goto out; 456 sent += err; 457 base = 0; 458 } else 459 base -= xdr->head[0].iov_len; 460 461 if (base < xdr->page_len) { 462 unsigned int len = xdr->page_len - base; 463 remainder -= len; 464 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 465 if (remainder == 0 || err != len) 466 goto out; 467 sent += err; 468 base = 0; 469 } else 470 base -= xdr->page_len; 471 472 if (base >= xdr->tail[0].iov_len) 473 return sent; 474 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 475 out: 476 if (sent == 0) 477 return err; 478 if (err > 0) 479 sent += err; 480 return sent; 481 } 482 483 static void xs_nospace_callback(struct rpc_task *task) 484 { 485 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 486 487 transport->inet->sk_write_pending--; 488 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 489 } 490 491 /** 492 * xs_nospace - place task on wait queue if transmit was incomplete 493 * @task: task to put to sleep 494 * 495 */ 496 static int xs_nospace(struct rpc_task *task) 497 { 498 struct rpc_rqst *req = task->tk_rqstp; 499 struct rpc_xprt *xprt = req->rq_xprt; 500 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 501 int ret = -EAGAIN; 502 503 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 504 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 505 req->rq_slen); 506 507 /* Protect against races with write_space */ 508 spin_lock_bh(&xprt->transport_lock); 509 510 /* Don't race with disconnect */ 511 if (xprt_connected(xprt)) { 512 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 513 /* 514 * Notify TCP that we're limited by the application 515 * window size 516 */ 517 set_bit(SOCK_NOSPACE, &transport->sock->flags); 518 transport->inet->sk_write_pending++; 519 /* ...and wait for more buffer space */ 520 xprt_wait_for_buffer_space(task, xs_nospace_callback); 521 } 522 } else { 523 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 524 ret = -ENOTCONN; 525 } 526 527 spin_unlock_bh(&xprt->transport_lock); 528 return ret; 529 } 530 531 /* 532 * Construct a stream transport record marker in @buf. 533 */ 534 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 535 { 536 u32 reclen = buf->len - sizeof(rpc_fraghdr); 537 rpc_fraghdr *base = buf->head[0].iov_base; 538 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 539 } 540 541 /** 542 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 543 * @task: RPC task that manages the state of an RPC request 544 * 545 * Return values: 546 * 0: The request has been sent 547 * EAGAIN: The socket was blocked, please call again later to 548 * complete the request 549 * ENOTCONN: Caller needs to invoke connect logic then call again 550 * other: Some other error occured, the request was not sent 551 */ 552 static int xs_local_send_request(struct rpc_task *task) 553 { 554 struct rpc_rqst *req = task->tk_rqstp; 555 struct rpc_xprt *xprt = req->rq_xprt; 556 struct sock_xprt *transport = 557 container_of(xprt, struct sock_xprt, xprt); 558 struct xdr_buf *xdr = &req->rq_snd_buf; 559 int status; 560 561 xs_encode_stream_record_marker(&req->rq_snd_buf); 562 563 xs_pktdump("packet data:", 564 req->rq_svec->iov_base, req->rq_svec->iov_len); 565 566 status = xs_sendpages(transport->sock, NULL, 0, 567 xdr, req->rq_bytes_sent); 568 dprintk("RPC: %s(%u) = %d\n", 569 __func__, xdr->len - req->rq_bytes_sent, status); 570 if (likely(status >= 0)) { 571 req->rq_bytes_sent += status; 572 req->rq_xmit_bytes_sent += status; 573 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 574 req->rq_bytes_sent = 0; 575 return 0; 576 } 577 status = -EAGAIN; 578 } 579 580 switch (status) { 581 case -EAGAIN: 582 status = xs_nospace(task); 583 break; 584 default: 585 dprintk("RPC: sendmsg returned unrecognized error %d\n", 586 -status); 587 case -EPIPE: 588 xs_close(xprt); 589 status = -ENOTCONN; 590 } 591 592 return status; 593 } 594 595 /** 596 * xs_udp_send_request - write an RPC request to a UDP socket 597 * @task: address of RPC task that manages the state of an RPC request 598 * 599 * Return values: 600 * 0: The request has been sent 601 * EAGAIN: The socket was blocked, please call again later to 602 * complete the request 603 * ENOTCONN: Caller needs to invoke connect logic then call again 604 * other: Some other error occurred, the request was not sent 605 */ 606 static int xs_udp_send_request(struct rpc_task *task) 607 { 608 struct rpc_rqst *req = task->tk_rqstp; 609 struct rpc_xprt *xprt = req->rq_xprt; 610 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 611 struct xdr_buf *xdr = &req->rq_snd_buf; 612 int status; 613 614 xs_pktdump("packet data:", 615 req->rq_svec->iov_base, 616 req->rq_svec->iov_len); 617 618 if (!xprt_bound(xprt)) 619 return -ENOTCONN; 620 status = xs_sendpages(transport->sock, 621 xs_addr(xprt), 622 xprt->addrlen, xdr, 623 req->rq_bytes_sent); 624 625 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 626 xdr->len - req->rq_bytes_sent, status); 627 628 if (status >= 0) { 629 req->rq_xmit_bytes_sent += status; 630 if (status >= req->rq_slen) 631 return 0; 632 /* Still some bytes left; set up for a retry later. */ 633 status = -EAGAIN; 634 } 635 636 switch (status) { 637 case -ENOTSOCK: 638 status = -ENOTCONN; 639 /* Should we call xs_close() here? */ 640 break; 641 case -EAGAIN: 642 status = xs_nospace(task); 643 break; 644 default: 645 dprintk("RPC: sendmsg returned unrecognized error %d\n", 646 -status); 647 case -ENETUNREACH: 648 case -EPIPE: 649 case -ECONNREFUSED: 650 /* When the server has died, an ICMP port unreachable message 651 * prompts ECONNREFUSED. */ 652 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 653 } 654 655 return status; 656 } 657 658 /** 659 * xs_tcp_shutdown - gracefully shut down a TCP socket 660 * @xprt: transport 661 * 662 * Initiates a graceful shutdown of the TCP socket by calling the 663 * equivalent of shutdown(SHUT_WR); 664 */ 665 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 666 { 667 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 668 struct socket *sock = transport->sock; 669 670 if (sock != NULL) { 671 kernel_sock_shutdown(sock, SHUT_WR); 672 trace_rpc_socket_shutdown(xprt, sock); 673 } 674 } 675 676 /** 677 * xs_tcp_send_request - write an RPC request to a TCP socket 678 * @task: address of RPC task that manages the state of an RPC request 679 * 680 * Return values: 681 * 0: The request has been sent 682 * EAGAIN: The socket was blocked, please call again later to 683 * complete the request 684 * ENOTCONN: Caller needs to invoke connect logic then call again 685 * other: Some other error occurred, the request was not sent 686 * 687 * XXX: In the case of soft timeouts, should we eventually give up 688 * if sendmsg is not able to make progress? 689 */ 690 static int xs_tcp_send_request(struct rpc_task *task) 691 { 692 struct rpc_rqst *req = task->tk_rqstp; 693 struct rpc_xprt *xprt = req->rq_xprt; 694 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 695 struct xdr_buf *xdr = &req->rq_snd_buf; 696 int status; 697 698 xs_encode_stream_record_marker(&req->rq_snd_buf); 699 700 xs_pktdump("packet data:", 701 req->rq_svec->iov_base, 702 req->rq_svec->iov_len); 703 704 /* Continue transmitting the packet/record. We must be careful 705 * to cope with writespace callbacks arriving _after_ we have 706 * called sendmsg(). */ 707 while (1) { 708 status = xs_sendpages(transport->sock, 709 NULL, 0, xdr, req->rq_bytes_sent); 710 711 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 712 xdr->len - req->rq_bytes_sent, status); 713 714 if (unlikely(status < 0)) 715 break; 716 717 /* If we've sent the entire packet, immediately 718 * reset the count of bytes sent. */ 719 req->rq_bytes_sent += status; 720 req->rq_xmit_bytes_sent += status; 721 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 722 req->rq_bytes_sent = 0; 723 return 0; 724 } 725 726 if (status != 0) 727 continue; 728 status = -EAGAIN; 729 break; 730 } 731 732 switch (status) { 733 case -ENOTSOCK: 734 status = -ENOTCONN; 735 /* Should we call xs_close() here? */ 736 break; 737 case -EAGAIN: 738 status = xs_nospace(task); 739 break; 740 default: 741 dprintk("RPC: sendmsg returned unrecognized error %d\n", 742 -status); 743 case -ECONNRESET: 744 xs_tcp_shutdown(xprt); 745 case -ECONNREFUSED: 746 case -ENOTCONN: 747 case -EPIPE: 748 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 749 } 750 751 return status; 752 } 753 754 /** 755 * xs_tcp_release_xprt - clean up after a tcp transmission 756 * @xprt: transport 757 * @task: rpc task 758 * 759 * This cleans up if an error causes us to abort the transmission of a request. 760 * In this case, the socket may need to be reset in order to avoid confusing 761 * the server. 762 */ 763 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 764 { 765 struct rpc_rqst *req; 766 767 if (task != xprt->snd_task) 768 return; 769 if (task == NULL) 770 goto out_release; 771 req = task->tk_rqstp; 772 if (req == NULL) 773 goto out_release; 774 if (req->rq_bytes_sent == 0) 775 goto out_release; 776 if (req->rq_bytes_sent == req->rq_snd_buf.len) 777 goto out_release; 778 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 779 out_release: 780 xprt_release_xprt(xprt, task); 781 } 782 783 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 784 { 785 transport->old_data_ready = sk->sk_data_ready; 786 transport->old_state_change = sk->sk_state_change; 787 transport->old_write_space = sk->sk_write_space; 788 } 789 790 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 791 { 792 sk->sk_data_ready = transport->old_data_ready; 793 sk->sk_state_change = transport->old_state_change; 794 sk->sk_write_space = transport->old_write_space; 795 } 796 797 static void xs_reset_transport(struct sock_xprt *transport) 798 { 799 struct socket *sock = transport->sock; 800 struct sock *sk = transport->inet; 801 802 if (sk == NULL) 803 return; 804 805 transport->srcport = 0; 806 807 write_lock_bh(&sk->sk_callback_lock); 808 transport->inet = NULL; 809 transport->sock = NULL; 810 811 sk->sk_user_data = NULL; 812 813 xs_restore_old_callbacks(transport, sk); 814 write_unlock_bh(&sk->sk_callback_lock); 815 816 sk->sk_no_check = 0; 817 818 trace_rpc_socket_close(&transport->xprt, sock); 819 sock_release(sock); 820 } 821 822 /** 823 * xs_close - close a socket 824 * @xprt: transport 825 * 826 * This is used when all requests are complete; ie, no DRC state remains 827 * on the server we want to save. 828 * 829 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 830 * xs_reset_transport() zeroing the socket from underneath a writer. 831 */ 832 static void xs_close(struct rpc_xprt *xprt) 833 { 834 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 835 836 dprintk("RPC: xs_close xprt %p\n", xprt); 837 838 xs_reset_transport(transport); 839 xprt->reestablish_timeout = 0; 840 841 smp_mb__before_clear_bit(); 842 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 843 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 844 clear_bit(XPRT_CLOSING, &xprt->state); 845 smp_mb__after_clear_bit(); 846 xprt_disconnect_done(xprt); 847 } 848 849 static void xs_tcp_close(struct rpc_xprt *xprt) 850 { 851 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 852 xs_close(xprt); 853 else 854 xs_tcp_shutdown(xprt); 855 } 856 857 static void xs_local_destroy(struct rpc_xprt *xprt) 858 { 859 xs_close(xprt); 860 xs_free_peer_addresses(xprt); 861 xprt_free(xprt); 862 module_put(THIS_MODULE); 863 } 864 865 /** 866 * xs_destroy - prepare to shutdown a transport 867 * @xprt: doomed transport 868 * 869 */ 870 static void xs_destroy(struct rpc_xprt *xprt) 871 { 872 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 873 874 dprintk("RPC: xs_destroy xprt %p\n", xprt); 875 876 cancel_delayed_work_sync(&transport->connect_worker); 877 878 xs_local_destroy(xprt); 879 } 880 881 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 882 { 883 return (struct rpc_xprt *) sk->sk_user_data; 884 } 885 886 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 887 { 888 struct xdr_skb_reader desc = { 889 .skb = skb, 890 .offset = sizeof(rpc_fraghdr), 891 .count = skb->len - sizeof(rpc_fraghdr), 892 }; 893 894 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 895 return -1; 896 if (desc.count) 897 return -1; 898 return 0; 899 } 900 901 /** 902 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 903 * @sk: socket with data to read 904 * @len: how much data to read 905 * 906 * Currently this assumes we can read the whole reply in a single gulp. 907 */ 908 static void xs_local_data_ready(struct sock *sk, int len) 909 { 910 struct rpc_task *task; 911 struct rpc_xprt *xprt; 912 struct rpc_rqst *rovr; 913 struct sk_buff *skb; 914 int err, repsize, copied; 915 u32 _xid; 916 __be32 *xp; 917 918 read_lock_bh(&sk->sk_callback_lock); 919 dprintk("RPC: %s...\n", __func__); 920 xprt = xprt_from_sock(sk); 921 if (xprt == NULL) 922 goto out; 923 924 skb = skb_recv_datagram(sk, 0, 1, &err); 925 if (skb == NULL) 926 goto out; 927 928 repsize = skb->len - sizeof(rpc_fraghdr); 929 if (repsize < 4) { 930 dprintk("RPC: impossible RPC reply size %d\n", repsize); 931 goto dropit; 932 } 933 934 /* Copy the XID from the skb... */ 935 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 936 if (xp == NULL) 937 goto dropit; 938 939 /* Look up and lock the request corresponding to the given XID */ 940 spin_lock(&xprt->transport_lock); 941 rovr = xprt_lookup_rqst(xprt, *xp); 942 if (!rovr) 943 goto out_unlock; 944 task = rovr->rq_task; 945 946 copied = rovr->rq_private_buf.buflen; 947 if (copied > repsize) 948 copied = repsize; 949 950 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 951 dprintk("RPC: sk_buff copy failed\n"); 952 goto out_unlock; 953 } 954 955 xprt_complete_rqst(task, copied); 956 957 out_unlock: 958 spin_unlock(&xprt->transport_lock); 959 dropit: 960 skb_free_datagram(sk, skb); 961 out: 962 read_unlock_bh(&sk->sk_callback_lock); 963 } 964 965 /** 966 * xs_udp_data_ready - "data ready" callback for UDP sockets 967 * @sk: socket with data to read 968 * @len: how much data to read 969 * 970 */ 971 static void xs_udp_data_ready(struct sock *sk, int len) 972 { 973 struct rpc_task *task; 974 struct rpc_xprt *xprt; 975 struct rpc_rqst *rovr; 976 struct sk_buff *skb; 977 int err, repsize, copied; 978 u32 _xid; 979 __be32 *xp; 980 981 read_lock_bh(&sk->sk_callback_lock); 982 dprintk("RPC: xs_udp_data_ready...\n"); 983 if (!(xprt = xprt_from_sock(sk))) 984 goto out; 985 986 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 987 goto out; 988 989 repsize = skb->len - sizeof(struct udphdr); 990 if (repsize < 4) { 991 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 992 goto dropit; 993 } 994 995 /* Copy the XID from the skb... */ 996 xp = skb_header_pointer(skb, sizeof(struct udphdr), 997 sizeof(_xid), &_xid); 998 if (xp == NULL) 999 goto dropit; 1000 1001 /* Look up and lock the request corresponding to the given XID */ 1002 spin_lock(&xprt->transport_lock); 1003 rovr = xprt_lookup_rqst(xprt, *xp); 1004 if (!rovr) 1005 goto out_unlock; 1006 task = rovr->rq_task; 1007 1008 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1009 copied = repsize; 1010 1011 /* Suck it into the iovec, verify checksum if not done by hw. */ 1012 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1013 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1014 goto out_unlock; 1015 } 1016 1017 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1018 1019 xprt_adjust_cwnd(xprt, task, copied); 1020 xprt_complete_rqst(task, copied); 1021 1022 out_unlock: 1023 spin_unlock(&xprt->transport_lock); 1024 dropit: 1025 skb_free_datagram(sk, skb); 1026 out: 1027 read_unlock_bh(&sk->sk_callback_lock); 1028 } 1029 1030 /* 1031 * Helper function to force a TCP close if the server is sending 1032 * junk and/or it has put us in CLOSE_WAIT 1033 */ 1034 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1035 { 1036 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1037 xprt_force_disconnect(xprt); 1038 } 1039 1040 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1041 { 1042 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1043 size_t len, used; 1044 char *p; 1045 1046 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1047 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1048 used = xdr_skb_read_bits(desc, p, len); 1049 transport->tcp_offset += used; 1050 if (used != len) 1051 return; 1052 1053 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1054 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1055 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1056 else 1057 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1058 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1059 1060 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1061 transport->tcp_offset = 0; 1062 1063 /* Sanity check of the record length */ 1064 if (unlikely(transport->tcp_reclen < 8)) { 1065 dprintk("RPC: invalid TCP record fragment length\n"); 1066 xs_tcp_force_close(xprt); 1067 return; 1068 } 1069 dprintk("RPC: reading TCP record fragment of length %d\n", 1070 transport->tcp_reclen); 1071 } 1072 1073 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1074 { 1075 if (transport->tcp_offset == transport->tcp_reclen) { 1076 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1077 transport->tcp_offset = 0; 1078 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1079 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1080 transport->tcp_flags |= TCP_RCV_COPY_XID; 1081 transport->tcp_copied = 0; 1082 } 1083 } 1084 } 1085 1086 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1087 { 1088 size_t len, used; 1089 char *p; 1090 1091 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1092 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1093 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1094 used = xdr_skb_read_bits(desc, p, len); 1095 transport->tcp_offset += used; 1096 if (used != len) 1097 return; 1098 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1099 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1100 transport->tcp_copied = 4; 1101 dprintk("RPC: reading %s XID %08x\n", 1102 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1103 : "request with", 1104 ntohl(transport->tcp_xid)); 1105 xs_tcp_check_fraghdr(transport); 1106 } 1107 1108 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1109 struct xdr_skb_reader *desc) 1110 { 1111 size_t len, used; 1112 u32 offset; 1113 char *p; 1114 1115 /* 1116 * We want transport->tcp_offset to be 8 at the end of this routine 1117 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1118 * When this function is called for the first time, 1119 * transport->tcp_offset is 4 (after having already read the xid). 1120 */ 1121 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1122 len = sizeof(transport->tcp_calldir) - offset; 1123 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1124 p = ((char *) &transport->tcp_calldir) + offset; 1125 used = xdr_skb_read_bits(desc, p, len); 1126 transport->tcp_offset += used; 1127 if (used != len) 1128 return; 1129 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1130 /* 1131 * We don't yet have the XDR buffer, so we will write the calldir 1132 * out after we get the buffer from the 'struct rpc_rqst' 1133 */ 1134 switch (ntohl(transport->tcp_calldir)) { 1135 case RPC_REPLY: 1136 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1137 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1138 transport->tcp_flags |= TCP_RPC_REPLY; 1139 break; 1140 case RPC_CALL: 1141 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1142 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1143 transport->tcp_flags &= ~TCP_RPC_REPLY; 1144 break; 1145 default: 1146 dprintk("RPC: invalid request message type\n"); 1147 xs_tcp_force_close(&transport->xprt); 1148 } 1149 xs_tcp_check_fraghdr(transport); 1150 } 1151 1152 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1153 struct xdr_skb_reader *desc, 1154 struct rpc_rqst *req) 1155 { 1156 struct sock_xprt *transport = 1157 container_of(xprt, struct sock_xprt, xprt); 1158 struct xdr_buf *rcvbuf; 1159 size_t len; 1160 ssize_t r; 1161 1162 rcvbuf = &req->rq_private_buf; 1163 1164 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1165 /* 1166 * Save the RPC direction in the XDR buffer 1167 */ 1168 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1169 &transport->tcp_calldir, 1170 sizeof(transport->tcp_calldir)); 1171 transport->tcp_copied += sizeof(transport->tcp_calldir); 1172 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1173 } 1174 1175 len = desc->count; 1176 if (len > transport->tcp_reclen - transport->tcp_offset) { 1177 struct xdr_skb_reader my_desc; 1178 1179 len = transport->tcp_reclen - transport->tcp_offset; 1180 memcpy(&my_desc, desc, sizeof(my_desc)); 1181 my_desc.count = len; 1182 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1183 &my_desc, xdr_skb_read_bits); 1184 desc->count -= r; 1185 desc->offset += r; 1186 } else 1187 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1188 desc, xdr_skb_read_bits); 1189 1190 if (r > 0) { 1191 transport->tcp_copied += r; 1192 transport->tcp_offset += r; 1193 } 1194 if (r != len) { 1195 /* Error when copying to the receive buffer, 1196 * usually because we weren't able to allocate 1197 * additional buffer pages. All we can do now 1198 * is turn off TCP_RCV_COPY_DATA, so the request 1199 * will not receive any additional updates, 1200 * and time out. 1201 * Any remaining data from this record will 1202 * be discarded. 1203 */ 1204 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1205 dprintk("RPC: XID %08x truncated request\n", 1206 ntohl(transport->tcp_xid)); 1207 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1208 "tcp_offset = %u, tcp_reclen = %u\n", 1209 xprt, transport->tcp_copied, 1210 transport->tcp_offset, transport->tcp_reclen); 1211 return; 1212 } 1213 1214 dprintk("RPC: XID %08x read %Zd bytes\n", 1215 ntohl(transport->tcp_xid), r); 1216 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1217 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1218 transport->tcp_offset, transport->tcp_reclen); 1219 1220 if (transport->tcp_copied == req->rq_private_buf.buflen) 1221 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1222 else if (transport->tcp_offset == transport->tcp_reclen) { 1223 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1224 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1225 } 1226 } 1227 1228 /* 1229 * Finds the request corresponding to the RPC xid and invokes the common 1230 * tcp read code to read the data. 1231 */ 1232 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1233 struct xdr_skb_reader *desc) 1234 { 1235 struct sock_xprt *transport = 1236 container_of(xprt, struct sock_xprt, xprt); 1237 struct rpc_rqst *req; 1238 1239 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1240 1241 /* Find and lock the request corresponding to this xid */ 1242 spin_lock(&xprt->transport_lock); 1243 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1244 if (!req) { 1245 dprintk("RPC: XID %08x request not found!\n", 1246 ntohl(transport->tcp_xid)); 1247 spin_unlock(&xprt->transport_lock); 1248 return -1; 1249 } 1250 1251 xs_tcp_read_common(xprt, desc, req); 1252 1253 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1254 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1255 1256 spin_unlock(&xprt->transport_lock); 1257 return 0; 1258 } 1259 1260 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1261 /* 1262 * Obtains an rpc_rqst previously allocated and invokes the common 1263 * tcp read code to read the data. The result is placed in the callback 1264 * queue. 1265 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1266 * connection and return -1. 1267 */ 1268 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1269 struct xdr_skb_reader *desc) 1270 { 1271 struct sock_xprt *transport = 1272 container_of(xprt, struct sock_xprt, xprt); 1273 struct rpc_rqst *req; 1274 1275 req = xprt_alloc_bc_request(xprt); 1276 if (req == NULL) { 1277 printk(KERN_WARNING "Callback slot table overflowed\n"); 1278 xprt_force_disconnect(xprt); 1279 return -1; 1280 } 1281 1282 req->rq_xid = transport->tcp_xid; 1283 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1284 xs_tcp_read_common(xprt, desc, req); 1285 1286 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1287 struct svc_serv *bc_serv = xprt->bc_serv; 1288 1289 /* 1290 * Add callback request to callback list. The callback 1291 * service sleeps on the sv_cb_waitq waiting for new 1292 * requests. Wake it up after adding enqueing the 1293 * request. 1294 */ 1295 dprintk("RPC: add callback request to list\n"); 1296 spin_lock(&bc_serv->sv_cb_lock); 1297 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1298 spin_unlock(&bc_serv->sv_cb_lock); 1299 wake_up(&bc_serv->sv_cb_waitq); 1300 } 1301 1302 req->rq_private_buf.len = transport->tcp_copied; 1303 1304 return 0; 1305 } 1306 1307 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1308 struct xdr_skb_reader *desc) 1309 { 1310 struct sock_xprt *transport = 1311 container_of(xprt, struct sock_xprt, xprt); 1312 1313 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1314 xs_tcp_read_reply(xprt, desc) : 1315 xs_tcp_read_callback(xprt, desc); 1316 } 1317 #else 1318 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1319 struct xdr_skb_reader *desc) 1320 { 1321 return xs_tcp_read_reply(xprt, desc); 1322 } 1323 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1324 1325 /* 1326 * Read data off the transport. This can be either an RPC_CALL or an 1327 * RPC_REPLY. Relay the processing to helper functions. 1328 */ 1329 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1330 struct xdr_skb_reader *desc) 1331 { 1332 struct sock_xprt *transport = 1333 container_of(xprt, struct sock_xprt, xprt); 1334 1335 if (_xs_tcp_read_data(xprt, desc) == 0) 1336 xs_tcp_check_fraghdr(transport); 1337 else { 1338 /* 1339 * The transport_lock protects the request handling. 1340 * There's no need to hold it to update the tcp_flags. 1341 */ 1342 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1343 } 1344 } 1345 1346 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1347 { 1348 size_t len; 1349 1350 len = transport->tcp_reclen - transport->tcp_offset; 1351 if (len > desc->count) 1352 len = desc->count; 1353 desc->count -= len; 1354 desc->offset += len; 1355 transport->tcp_offset += len; 1356 dprintk("RPC: discarded %Zu bytes\n", len); 1357 xs_tcp_check_fraghdr(transport); 1358 } 1359 1360 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1361 { 1362 struct rpc_xprt *xprt = rd_desc->arg.data; 1363 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1364 struct xdr_skb_reader desc = { 1365 .skb = skb, 1366 .offset = offset, 1367 .count = len, 1368 }; 1369 1370 dprintk("RPC: xs_tcp_data_recv started\n"); 1371 do { 1372 /* Read in a new fragment marker if necessary */ 1373 /* Can we ever really expect to get completely empty fragments? */ 1374 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1375 xs_tcp_read_fraghdr(xprt, &desc); 1376 continue; 1377 } 1378 /* Read in the xid if necessary */ 1379 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1380 xs_tcp_read_xid(transport, &desc); 1381 continue; 1382 } 1383 /* Read in the call/reply flag */ 1384 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1385 xs_tcp_read_calldir(transport, &desc); 1386 continue; 1387 } 1388 /* Read in the request data */ 1389 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1390 xs_tcp_read_data(xprt, &desc); 1391 continue; 1392 } 1393 /* Skip over any trailing bytes on short reads */ 1394 xs_tcp_read_discard(transport, &desc); 1395 } while (desc.count); 1396 dprintk("RPC: xs_tcp_data_recv done\n"); 1397 return len - desc.count; 1398 } 1399 1400 /** 1401 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1402 * @sk: socket with data to read 1403 * @bytes: how much data to read 1404 * 1405 */ 1406 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1407 { 1408 struct rpc_xprt *xprt; 1409 read_descriptor_t rd_desc; 1410 int read; 1411 1412 dprintk("RPC: xs_tcp_data_ready...\n"); 1413 1414 read_lock_bh(&sk->sk_callback_lock); 1415 if (!(xprt = xprt_from_sock(sk))) 1416 goto out; 1417 /* Any data means we had a useful conversation, so 1418 * the we don't need to delay the next reconnect 1419 */ 1420 if (xprt->reestablish_timeout) 1421 xprt->reestablish_timeout = 0; 1422 1423 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1424 rd_desc.arg.data = xprt; 1425 do { 1426 rd_desc.count = 65536; 1427 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1428 } while (read > 0); 1429 out: 1430 read_unlock_bh(&sk->sk_callback_lock); 1431 } 1432 1433 /* 1434 * Do the equivalent of linger/linger2 handling for dealing with 1435 * broken servers that don't close the socket in a timely 1436 * fashion 1437 */ 1438 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1439 unsigned long timeout) 1440 { 1441 struct sock_xprt *transport; 1442 1443 if (xprt_test_and_set_connecting(xprt)) 1444 return; 1445 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1446 transport = container_of(xprt, struct sock_xprt, xprt); 1447 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1448 timeout); 1449 } 1450 1451 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1452 { 1453 struct sock_xprt *transport; 1454 1455 transport = container_of(xprt, struct sock_xprt, xprt); 1456 1457 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1458 !cancel_delayed_work(&transport->connect_worker)) 1459 return; 1460 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1461 xprt_clear_connecting(xprt); 1462 } 1463 1464 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1465 { 1466 smp_mb__before_clear_bit(); 1467 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1468 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1469 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1470 clear_bit(XPRT_CLOSING, &xprt->state); 1471 smp_mb__after_clear_bit(); 1472 } 1473 1474 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1475 { 1476 xs_sock_reset_connection_flags(xprt); 1477 /* Mark transport as closed and wake up all pending tasks */ 1478 xprt_disconnect_done(xprt); 1479 } 1480 1481 /** 1482 * xs_tcp_state_change - callback to handle TCP socket state changes 1483 * @sk: socket whose state has changed 1484 * 1485 */ 1486 static void xs_tcp_state_change(struct sock *sk) 1487 { 1488 struct rpc_xprt *xprt; 1489 1490 read_lock_bh(&sk->sk_callback_lock); 1491 if (!(xprt = xprt_from_sock(sk))) 1492 goto out; 1493 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1494 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1495 sk->sk_state, xprt_connected(xprt), 1496 sock_flag(sk, SOCK_DEAD), 1497 sock_flag(sk, SOCK_ZAPPED), 1498 sk->sk_shutdown); 1499 1500 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1501 switch (sk->sk_state) { 1502 case TCP_ESTABLISHED: 1503 spin_lock(&xprt->transport_lock); 1504 if (!xprt_test_and_set_connected(xprt)) { 1505 struct sock_xprt *transport = container_of(xprt, 1506 struct sock_xprt, xprt); 1507 1508 /* Reset TCP record info */ 1509 transport->tcp_offset = 0; 1510 transport->tcp_reclen = 0; 1511 transport->tcp_copied = 0; 1512 transport->tcp_flags = 1513 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1514 1515 xprt_wake_pending_tasks(xprt, -EAGAIN); 1516 } 1517 spin_unlock(&xprt->transport_lock); 1518 break; 1519 case TCP_FIN_WAIT1: 1520 /* The client initiated a shutdown of the socket */ 1521 xprt->connect_cookie++; 1522 xprt->reestablish_timeout = 0; 1523 set_bit(XPRT_CLOSING, &xprt->state); 1524 smp_mb__before_clear_bit(); 1525 clear_bit(XPRT_CONNECTED, &xprt->state); 1526 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1527 smp_mb__after_clear_bit(); 1528 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1529 break; 1530 case TCP_CLOSE_WAIT: 1531 /* The server initiated a shutdown of the socket */ 1532 xprt->connect_cookie++; 1533 clear_bit(XPRT_CONNECTED, &xprt->state); 1534 xs_tcp_force_close(xprt); 1535 case TCP_CLOSING: 1536 /* 1537 * If the server closed down the connection, make sure that 1538 * we back off before reconnecting 1539 */ 1540 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1541 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1542 break; 1543 case TCP_LAST_ACK: 1544 set_bit(XPRT_CLOSING, &xprt->state); 1545 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1546 smp_mb__before_clear_bit(); 1547 clear_bit(XPRT_CONNECTED, &xprt->state); 1548 smp_mb__after_clear_bit(); 1549 break; 1550 case TCP_CLOSE: 1551 xs_tcp_cancel_linger_timeout(xprt); 1552 xs_sock_mark_closed(xprt); 1553 } 1554 out: 1555 read_unlock_bh(&sk->sk_callback_lock); 1556 } 1557 1558 static void xs_write_space(struct sock *sk) 1559 { 1560 struct socket *sock; 1561 struct rpc_xprt *xprt; 1562 1563 if (unlikely(!(sock = sk->sk_socket))) 1564 return; 1565 clear_bit(SOCK_NOSPACE, &sock->flags); 1566 1567 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1568 return; 1569 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1570 return; 1571 1572 xprt_write_space(xprt); 1573 } 1574 1575 /** 1576 * xs_udp_write_space - callback invoked when socket buffer space 1577 * becomes available 1578 * @sk: socket whose state has changed 1579 * 1580 * Called when more output buffer space is available for this socket. 1581 * We try not to wake our writers until they can make "significant" 1582 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1583 * with a bunch of small requests. 1584 */ 1585 static void xs_udp_write_space(struct sock *sk) 1586 { 1587 read_lock_bh(&sk->sk_callback_lock); 1588 1589 /* from net/core/sock.c:sock_def_write_space */ 1590 if (sock_writeable(sk)) 1591 xs_write_space(sk); 1592 1593 read_unlock_bh(&sk->sk_callback_lock); 1594 } 1595 1596 /** 1597 * xs_tcp_write_space - callback invoked when socket buffer space 1598 * becomes available 1599 * @sk: socket whose state has changed 1600 * 1601 * Called when more output buffer space is available for this socket. 1602 * We try not to wake our writers until they can make "significant" 1603 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1604 * with a bunch of small requests. 1605 */ 1606 static void xs_tcp_write_space(struct sock *sk) 1607 { 1608 read_lock_bh(&sk->sk_callback_lock); 1609 1610 /* from net/core/stream.c:sk_stream_write_space */ 1611 if (sk_stream_is_writeable(sk)) 1612 xs_write_space(sk); 1613 1614 read_unlock_bh(&sk->sk_callback_lock); 1615 } 1616 1617 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1618 { 1619 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1620 struct sock *sk = transport->inet; 1621 1622 if (transport->rcvsize) { 1623 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1624 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1625 } 1626 if (transport->sndsize) { 1627 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1628 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1629 sk->sk_write_space(sk); 1630 } 1631 } 1632 1633 /** 1634 * xs_udp_set_buffer_size - set send and receive limits 1635 * @xprt: generic transport 1636 * @sndsize: requested size of send buffer, in bytes 1637 * @rcvsize: requested size of receive buffer, in bytes 1638 * 1639 * Set socket send and receive buffer size limits. 1640 */ 1641 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1642 { 1643 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1644 1645 transport->sndsize = 0; 1646 if (sndsize) 1647 transport->sndsize = sndsize + 1024; 1648 transport->rcvsize = 0; 1649 if (rcvsize) 1650 transport->rcvsize = rcvsize + 1024; 1651 1652 xs_udp_do_set_buffer_size(xprt); 1653 } 1654 1655 /** 1656 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1657 * @task: task that timed out 1658 * 1659 * Adjust the congestion window after a retransmit timeout has occurred. 1660 */ 1661 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1662 { 1663 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1664 } 1665 1666 static unsigned short xs_get_random_port(void) 1667 { 1668 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1669 unsigned short rand = (unsigned short) net_random() % range; 1670 return rand + xprt_min_resvport; 1671 } 1672 1673 /** 1674 * xs_set_port - reset the port number in the remote endpoint address 1675 * @xprt: generic transport 1676 * @port: new port number 1677 * 1678 */ 1679 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1680 { 1681 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1682 1683 rpc_set_port(xs_addr(xprt), port); 1684 xs_update_peer_port(xprt); 1685 } 1686 1687 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1688 { 1689 unsigned short port = transport->srcport; 1690 1691 if (port == 0 && transport->xprt.resvport) 1692 port = xs_get_random_port(); 1693 return port; 1694 } 1695 1696 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1697 { 1698 if (transport->srcport != 0) 1699 transport->srcport = 0; 1700 if (!transport->xprt.resvport) 1701 return 0; 1702 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1703 return xprt_max_resvport; 1704 return --port; 1705 } 1706 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1707 { 1708 struct sockaddr_storage myaddr; 1709 int err, nloop = 0; 1710 unsigned short port = xs_get_srcport(transport); 1711 unsigned short last; 1712 1713 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1714 do { 1715 rpc_set_port((struct sockaddr *)&myaddr, port); 1716 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1717 transport->xprt.addrlen); 1718 if (port == 0) 1719 break; 1720 if (err == 0) { 1721 transport->srcport = port; 1722 break; 1723 } 1724 last = port; 1725 port = xs_next_srcport(transport, port); 1726 if (port > last) 1727 nloop++; 1728 } while (err == -EADDRINUSE && nloop != 2); 1729 1730 if (myaddr.ss_family == AF_INET) 1731 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1732 &((struct sockaddr_in *)&myaddr)->sin_addr, 1733 port, err ? "failed" : "ok", err); 1734 else 1735 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1736 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1737 port, err ? "failed" : "ok", err); 1738 return err; 1739 } 1740 1741 /* 1742 * We don't support autobind on AF_LOCAL sockets 1743 */ 1744 static void xs_local_rpcbind(struct rpc_task *task) 1745 { 1746 rcu_read_lock(); 1747 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); 1748 rcu_read_unlock(); 1749 } 1750 1751 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1752 { 1753 } 1754 1755 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1756 static struct lock_class_key xs_key[2]; 1757 static struct lock_class_key xs_slock_key[2]; 1758 1759 static inline void xs_reclassify_socketu(struct socket *sock) 1760 { 1761 struct sock *sk = sock->sk; 1762 1763 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1764 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1765 } 1766 1767 static inline void xs_reclassify_socket4(struct socket *sock) 1768 { 1769 struct sock *sk = sock->sk; 1770 1771 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1772 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1773 } 1774 1775 static inline void xs_reclassify_socket6(struct socket *sock) 1776 { 1777 struct sock *sk = sock->sk; 1778 1779 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1780 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1781 } 1782 1783 static inline void xs_reclassify_socket(int family, struct socket *sock) 1784 { 1785 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1786 if (sock_owned_by_user(sock->sk)) 1787 return; 1788 1789 switch (family) { 1790 case AF_LOCAL: 1791 xs_reclassify_socketu(sock); 1792 break; 1793 case AF_INET: 1794 xs_reclassify_socket4(sock); 1795 break; 1796 case AF_INET6: 1797 xs_reclassify_socket6(sock); 1798 break; 1799 } 1800 } 1801 #else 1802 static inline void xs_reclassify_socketu(struct socket *sock) 1803 { 1804 } 1805 1806 static inline void xs_reclassify_socket4(struct socket *sock) 1807 { 1808 } 1809 1810 static inline void xs_reclassify_socket6(struct socket *sock) 1811 { 1812 } 1813 1814 static inline void xs_reclassify_socket(int family, struct socket *sock) 1815 { 1816 } 1817 #endif 1818 1819 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1820 struct sock_xprt *transport, int family, int type, int protocol) 1821 { 1822 struct socket *sock; 1823 int err; 1824 1825 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1826 if (err < 0) { 1827 dprintk("RPC: can't create %d transport socket (%d).\n", 1828 protocol, -err); 1829 goto out; 1830 } 1831 xs_reclassify_socket(family, sock); 1832 1833 err = xs_bind(transport, sock); 1834 if (err) { 1835 sock_release(sock); 1836 goto out; 1837 } 1838 1839 return sock; 1840 out: 1841 return ERR_PTR(err); 1842 } 1843 1844 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1845 struct socket *sock) 1846 { 1847 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1848 xprt); 1849 1850 if (!transport->inet) { 1851 struct sock *sk = sock->sk; 1852 1853 write_lock_bh(&sk->sk_callback_lock); 1854 1855 xs_save_old_callbacks(transport, sk); 1856 1857 sk->sk_user_data = xprt; 1858 sk->sk_data_ready = xs_local_data_ready; 1859 sk->sk_write_space = xs_udp_write_space; 1860 sk->sk_allocation = GFP_ATOMIC; 1861 1862 xprt_clear_connected(xprt); 1863 1864 /* Reset to new socket */ 1865 transport->sock = sock; 1866 transport->inet = sk; 1867 1868 write_unlock_bh(&sk->sk_callback_lock); 1869 } 1870 1871 /* Tell the socket layer to start connecting... */ 1872 xprt->stat.connect_count++; 1873 xprt->stat.connect_start = jiffies; 1874 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1875 } 1876 1877 /** 1878 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1879 * @xprt: RPC transport to connect 1880 * @transport: socket transport to connect 1881 * @create_sock: function to create a socket of the correct type 1882 */ 1883 static int xs_local_setup_socket(struct sock_xprt *transport) 1884 { 1885 struct rpc_xprt *xprt = &transport->xprt; 1886 struct socket *sock; 1887 int status = -EIO; 1888 1889 current->flags |= PF_FSTRANS; 1890 1891 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1892 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1893 SOCK_STREAM, 0, &sock, 1); 1894 if (status < 0) { 1895 dprintk("RPC: can't create AF_LOCAL " 1896 "transport socket (%d).\n", -status); 1897 goto out; 1898 } 1899 xs_reclassify_socketu(sock); 1900 1901 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1902 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1903 1904 status = xs_local_finish_connecting(xprt, sock); 1905 trace_rpc_socket_connect(xprt, sock, status); 1906 switch (status) { 1907 case 0: 1908 dprintk("RPC: xprt %p connected to %s\n", 1909 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1910 xprt_set_connected(xprt); 1911 break; 1912 case -ENOENT: 1913 dprintk("RPC: xprt %p: socket %s does not exist\n", 1914 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1915 break; 1916 case -ECONNREFUSED: 1917 dprintk("RPC: xprt %p: connection refused for %s\n", 1918 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1919 break; 1920 default: 1921 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1922 __func__, -status, 1923 xprt->address_strings[RPC_DISPLAY_ADDR]); 1924 } 1925 1926 out: 1927 xprt_clear_connecting(xprt); 1928 xprt_wake_pending_tasks(xprt, status); 1929 current->flags &= ~PF_FSTRANS; 1930 return status; 1931 } 1932 1933 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1934 { 1935 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1936 int ret; 1937 1938 if (RPC_IS_ASYNC(task)) { 1939 /* 1940 * We want the AF_LOCAL connect to be resolved in the 1941 * filesystem namespace of the process making the rpc 1942 * call. Thus we connect synchronously. 1943 * 1944 * If we want to support asynchronous AF_LOCAL calls, 1945 * we'll need to figure out how to pass a namespace to 1946 * connect. 1947 */ 1948 rpc_exit(task, -ENOTCONN); 1949 return; 1950 } 1951 ret = xs_local_setup_socket(transport); 1952 if (ret && !RPC_IS_SOFTCONN(task)) 1953 msleep_interruptible(15000); 1954 } 1955 1956 #ifdef CONFIG_SUNRPC_SWAP 1957 static void xs_set_memalloc(struct rpc_xprt *xprt) 1958 { 1959 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1960 xprt); 1961 1962 if (xprt->swapper) 1963 sk_set_memalloc(transport->inet); 1964 } 1965 1966 /** 1967 * xs_swapper - Tag this transport as being used for swap. 1968 * @xprt: transport to tag 1969 * @enable: enable/disable 1970 * 1971 */ 1972 int xs_swapper(struct rpc_xprt *xprt, int enable) 1973 { 1974 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1975 xprt); 1976 int err = 0; 1977 1978 if (enable) { 1979 xprt->swapper++; 1980 xs_set_memalloc(xprt); 1981 } else if (xprt->swapper) { 1982 xprt->swapper--; 1983 sk_clear_memalloc(transport->inet); 1984 } 1985 1986 return err; 1987 } 1988 EXPORT_SYMBOL_GPL(xs_swapper); 1989 #else 1990 static void xs_set_memalloc(struct rpc_xprt *xprt) 1991 { 1992 } 1993 #endif 1994 1995 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1996 { 1997 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1998 1999 if (!transport->inet) { 2000 struct sock *sk = sock->sk; 2001 2002 write_lock_bh(&sk->sk_callback_lock); 2003 2004 xs_save_old_callbacks(transport, sk); 2005 2006 sk->sk_user_data = xprt; 2007 sk->sk_data_ready = xs_udp_data_ready; 2008 sk->sk_write_space = xs_udp_write_space; 2009 sk->sk_no_check = UDP_CSUM_NORCV; 2010 sk->sk_allocation = GFP_ATOMIC; 2011 2012 xprt_set_connected(xprt); 2013 2014 /* Reset to new socket */ 2015 transport->sock = sock; 2016 transport->inet = sk; 2017 2018 xs_set_memalloc(xprt); 2019 2020 write_unlock_bh(&sk->sk_callback_lock); 2021 } 2022 xs_udp_do_set_buffer_size(xprt); 2023 } 2024 2025 static void xs_udp_setup_socket(struct work_struct *work) 2026 { 2027 struct sock_xprt *transport = 2028 container_of(work, struct sock_xprt, connect_worker.work); 2029 struct rpc_xprt *xprt = &transport->xprt; 2030 struct socket *sock = transport->sock; 2031 int status = -EIO; 2032 2033 current->flags |= PF_FSTRANS; 2034 2035 /* Start by resetting any existing state */ 2036 xs_reset_transport(transport); 2037 sock = xs_create_sock(xprt, transport, 2038 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 2039 if (IS_ERR(sock)) 2040 goto out; 2041 2042 dprintk("RPC: worker connecting xprt %p via %s to " 2043 "%s (port %s)\n", xprt, 2044 xprt->address_strings[RPC_DISPLAY_PROTO], 2045 xprt->address_strings[RPC_DISPLAY_ADDR], 2046 xprt->address_strings[RPC_DISPLAY_PORT]); 2047 2048 xs_udp_finish_connecting(xprt, sock); 2049 trace_rpc_socket_connect(xprt, sock, 0); 2050 status = 0; 2051 out: 2052 xprt_clear_connecting(xprt); 2053 xprt_wake_pending_tasks(xprt, status); 2054 current->flags &= ~PF_FSTRANS; 2055 } 2056 2057 /* 2058 * We need to preserve the port number so the reply cache on the server can 2059 * find our cached RPC replies when we get around to reconnecting. 2060 */ 2061 static void xs_abort_connection(struct sock_xprt *transport) 2062 { 2063 int result; 2064 struct sockaddr any; 2065 2066 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2067 2068 /* 2069 * Disconnect the transport socket by doing a connect operation 2070 * with AF_UNSPEC. This should return immediately... 2071 */ 2072 memset(&any, 0, sizeof(any)); 2073 any.sa_family = AF_UNSPEC; 2074 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2075 trace_rpc_socket_reset_connection(&transport->xprt, 2076 transport->sock, result); 2077 if (!result) 2078 xs_sock_reset_connection_flags(&transport->xprt); 2079 dprintk("RPC: AF_UNSPEC connect return code %d\n", result); 2080 } 2081 2082 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2083 { 2084 unsigned int state = transport->inet->sk_state; 2085 2086 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2087 /* we don't need to abort the connection if the socket 2088 * hasn't undergone a shutdown 2089 */ 2090 if (transport->inet->sk_shutdown == 0) 2091 return; 2092 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2093 __func__, transport->inet->sk_shutdown); 2094 } 2095 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2096 /* we don't need to abort the connection if the socket 2097 * hasn't undergone a shutdown 2098 */ 2099 if (transport->inet->sk_shutdown == 0) 2100 return; 2101 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2102 "sk_shutdown set to %d\n", 2103 __func__, transport->inet->sk_shutdown); 2104 } 2105 xs_abort_connection(transport); 2106 } 2107 2108 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2109 { 2110 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2111 int ret = -ENOTCONN; 2112 2113 if (!transport->inet) { 2114 struct sock *sk = sock->sk; 2115 2116 write_lock_bh(&sk->sk_callback_lock); 2117 2118 xs_save_old_callbacks(transport, sk); 2119 2120 sk->sk_user_data = xprt; 2121 sk->sk_data_ready = xs_tcp_data_ready; 2122 sk->sk_state_change = xs_tcp_state_change; 2123 sk->sk_write_space = xs_tcp_write_space; 2124 sk->sk_allocation = GFP_ATOMIC; 2125 2126 /* socket options */ 2127 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2128 sock_reset_flag(sk, SOCK_LINGER); 2129 tcp_sk(sk)->linger2 = 0; 2130 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2131 2132 xprt_clear_connected(xprt); 2133 2134 /* Reset to new socket */ 2135 transport->sock = sock; 2136 transport->inet = sk; 2137 2138 write_unlock_bh(&sk->sk_callback_lock); 2139 } 2140 2141 if (!xprt_bound(xprt)) 2142 goto out; 2143 2144 xs_set_memalloc(xprt); 2145 2146 /* Tell the socket layer to start connecting... */ 2147 xprt->stat.connect_count++; 2148 xprt->stat.connect_start = jiffies; 2149 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2150 switch (ret) { 2151 case 0: 2152 case -EINPROGRESS: 2153 /* SYN_SENT! */ 2154 xprt->connect_cookie++; 2155 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2156 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2157 } 2158 out: 2159 return ret; 2160 } 2161 2162 /** 2163 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2164 * @xprt: RPC transport to connect 2165 * @transport: socket transport to connect 2166 * @create_sock: function to create a socket of the correct type 2167 * 2168 * Invoked by a work queue tasklet. 2169 */ 2170 static void xs_tcp_setup_socket(struct work_struct *work) 2171 { 2172 struct sock_xprt *transport = 2173 container_of(work, struct sock_xprt, connect_worker.work); 2174 struct socket *sock = transport->sock; 2175 struct rpc_xprt *xprt = &transport->xprt; 2176 int status = -EIO; 2177 2178 current->flags |= PF_FSTRANS; 2179 2180 if (!sock) { 2181 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2182 sock = xs_create_sock(xprt, transport, 2183 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2184 if (IS_ERR(sock)) { 2185 status = PTR_ERR(sock); 2186 goto out; 2187 } 2188 } else { 2189 int abort_and_exit; 2190 2191 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2192 &xprt->state); 2193 /* "close" the socket, preserving the local port */ 2194 xs_tcp_reuse_connection(transport); 2195 2196 if (abort_and_exit) 2197 goto out_eagain; 2198 } 2199 2200 dprintk("RPC: worker connecting xprt %p via %s to " 2201 "%s (port %s)\n", xprt, 2202 xprt->address_strings[RPC_DISPLAY_PROTO], 2203 xprt->address_strings[RPC_DISPLAY_ADDR], 2204 xprt->address_strings[RPC_DISPLAY_PORT]); 2205 2206 status = xs_tcp_finish_connecting(xprt, sock); 2207 trace_rpc_socket_connect(xprt, sock, status); 2208 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2209 xprt, -status, xprt_connected(xprt), 2210 sock->sk->sk_state); 2211 switch (status) { 2212 default: 2213 printk("%s: connect returned unhandled error %d\n", 2214 __func__, status); 2215 case -EADDRNOTAVAIL: 2216 /* We're probably in TIME_WAIT. Get rid of existing socket, 2217 * and retry 2218 */ 2219 xs_tcp_force_close(xprt); 2220 break; 2221 case 0: 2222 case -EINPROGRESS: 2223 case -EALREADY: 2224 xprt_clear_connecting(xprt); 2225 current->flags &= ~PF_FSTRANS; 2226 return; 2227 case -EINVAL: 2228 /* Happens, for instance, if the user specified a link 2229 * local IPv6 address without a scope-id. 2230 */ 2231 case -ECONNREFUSED: 2232 case -ECONNRESET: 2233 case -ENETUNREACH: 2234 /* retry with existing socket, after a delay */ 2235 goto out; 2236 } 2237 out_eagain: 2238 status = -EAGAIN; 2239 out: 2240 xprt_clear_connecting(xprt); 2241 xprt_wake_pending_tasks(xprt, status); 2242 current->flags &= ~PF_FSTRANS; 2243 } 2244 2245 /** 2246 * xs_connect - connect a socket to a remote endpoint 2247 * @xprt: pointer to transport structure 2248 * @task: address of RPC task that manages state of connect request 2249 * 2250 * TCP: If the remote end dropped the connection, delay reconnecting. 2251 * 2252 * UDP socket connects are synchronous, but we use a work queue anyway 2253 * to guarantee that even unprivileged user processes can set up a 2254 * socket on a privileged port. 2255 * 2256 * If a UDP socket connect fails, the delay behavior here prevents 2257 * retry floods (hard mounts). 2258 */ 2259 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2260 { 2261 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2262 2263 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2264 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2265 "seconds\n", 2266 xprt, xprt->reestablish_timeout / HZ); 2267 queue_delayed_work(rpciod_workqueue, 2268 &transport->connect_worker, 2269 xprt->reestablish_timeout); 2270 xprt->reestablish_timeout <<= 1; 2271 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2272 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2273 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2274 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2275 } else { 2276 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2277 queue_delayed_work(rpciod_workqueue, 2278 &transport->connect_worker, 0); 2279 } 2280 } 2281 2282 /** 2283 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2284 * @xprt: rpc_xprt struct containing statistics 2285 * @seq: output file 2286 * 2287 */ 2288 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2289 { 2290 long idle_time = 0; 2291 2292 if (xprt_connected(xprt)) 2293 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2294 2295 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2296 "%llu %llu %lu %llu %llu\n", 2297 xprt->stat.bind_count, 2298 xprt->stat.connect_count, 2299 xprt->stat.connect_time, 2300 idle_time, 2301 xprt->stat.sends, 2302 xprt->stat.recvs, 2303 xprt->stat.bad_xids, 2304 xprt->stat.req_u, 2305 xprt->stat.bklog_u, 2306 xprt->stat.max_slots, 2307 xprt->stat.sending_u, 2308 xprt->stat.pending_u); 2309 } 2310 2311 /** 2312 * xs_udp_print_stats - display UDP socket-specifc stats 2313 * @xprt: rpc_xprt struct containing statistics 2314 * @seq: output file 2315 * 2316 */ 2317 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2318 { 2319 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2320 2321 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2322 "%lu %llu %llu\n", 2323 transport->srcport, 2324 xprt->stat.bind_count, 2325 xprt->stat.sends, 2326 xprt->stat.recvs, 2327 xprt->stat.bad_xids, 2328 xprt->stat.req_u, 2329 xprt->stat.bklog_u, 2330 xprt->stat.max_slots, 2331 xprt->stat.sending_u, 2332 xprt->stat.pending_u); 2333 } 2334 2335 /** 2336 * xs_tcp_print_stats - display TCP socket-specifc stats 2337 * @xprt: rpc_xprt struct containing statistics 2338 * @seq: output file 2339 * 2340 */ 2341 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2342 { 2343 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2344 long idle_time = 0; 2345 2346 if (xprt_connected(xprt)) 2347 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2348 2349 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2350 "%llu %llu %lu %llu %llu\n", 2351 transport->srcport, 2352 xprt->stat.bind_count, 2353 xprt->stat.connect_count, 2354 xprt->stat.connect_time, 2355 idle_time, 2356 xprt->stat.sends, 2357 xprt->stat.recvs, 2358 xprt->stat.bad_xids, 2359 xprt->stat.req_u, 2360 xprt->stat.bklog_u, 2361 xprt->stat.max_slots, 2362 xprt->stat.sending_u, 2363 xprt->stat.pending_u); 2364 } 2365 2366 /* 2367 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2368 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2369 * to use the server side send routines. 2370 */ 2371 static void *bc_malloc(struct rpc_task *task, size_t size) 2372 { 2373 struct page *page; 2374 struct rpc_buffer *buf; 2375 2376 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2377 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2378 return NULL; 2379 2380 page = alloc_page(GFP_KERNEL); 2381 if (!page) 2382 return NULL; 2383 2384 buf = page_address(page); 2385 buf->len = PAGE_SIZE; 2386 2387 return buf->data; 2388 } 2389 2390 /* 2391 * Free the space allocated in the bc_alloc routine 2392 */ 2393 static void bc_free(void *buffer) 2394 { 2395 struct rpc_buffer *buf; 2396 2397 if (!buffer) 2398 return; 2399 2400 buf = container_of(buffer, struct rpc_buffer, data); 2401 free_page((unsigned long)buf); 2402 } 2403 2404 /* 2405 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2406 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2407 */ 2408 static int bc_sendto(struct rpc_rqst *req) 2409 { 2410 int len; 2411 struct xdr_buf *xbufp = &req->rq_snd_buf; 2412 struct rpc_xprt *xprt = req->rq_xprt; 2413 struct sock_xprt *transport = 2414 container_of(xprt, struct sock_xprt, xprt); 2415 struct socket *sock = transport->sock; 2416 unsigned long headoff; 2417 unsigned long tailoff; 2418 2419 xs_encode_stream_record_marker(xbufp); 2420 2421 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2422 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2423 len = svc_send_common(sock, xbufp, 2424 virt_to_page(xbufp->head[0].iov_base), headoff, 2425 xbufp->tail[0].iov_base, tailoff); 2426 2427 if (len != xbufp->len) { 2428 printk(KERN_NOTICE "Error sending entire callback!\n"); 2429 len = -EAGAIN; 2430 } 2431 2432 return len; 2433 } 2434 2435 /* 2436 * The send routine. Borrows from svc_send 2437 */ 2438 static int bc_send_request(struct rpc_task *task) 2439 { 2440 struct rpc_rqst *req = task->tk_rqstp; 2441 struct svc_xprt *xprt; 2442 u32 len; 2443 2444 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2445 /* 2446 * Get the server socket associated with this callback xprt 2447 */ 2448 xprt = req->rq_xprt->bc_xprt; 2449 2450 /* 2451 * Grab the mutex to serialize data as the connection is shared 2452 * with the fore channel 2453 */ 2454 if (!mutex_trylock(&xprt->xpt_mutex)) { 2455 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2456 if (!mutex_trylock(&xprt->xpt_mutex)) 2457 return -EAGAIN; 2458 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2459 } 2460 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2461 len = -ENOTCONN; 2462 else 2463 len = bc_sendto(req); 2464 mutex_unlock(&xprt->xpt_mutex); 2465 2466 if (len > 0) 2467 len = 0; 2468 2469 return len; 2470 } 2471 2472 /* 2473 * The close routine. Since this is client initiated, we do nothing 2474 */ 2475 2476 static void bc_close(struct rpc_xprt *xprt) 2477 { 2478 } 2479 2480 /* 2481 * The xprt destroy routine. Again, because this connection is client 2482 * initiated, we do nothing 2483 */ 2484 2485 static void bc_destroy(struct rpc_xprt *xprt) 2486 { 2487 } 2488 2489 static struct rpc_xprt_ops xs_local_ops = { 2490 .reserve_xprt = xprt_reserve_xprt, 2491 .release_xprt = xs_tcp_release_xprt, 2492 .alloc_slot = xprt_alloc_slot, 2493 .rpcbind = xs_local_rpcbind, 2494 .set_port = xs_local_set_port, 2495 .connect = xs_local_connect, 2496 .buf_alloc = rpc_malloc, 2497 .buf_free = rpc_free, 2498 .send_request = xs_local_send_request, 2499 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2500 .close = xs_close, 2501 .destroy = xs_local_destroy, 2502 .print_stats = xs_local_print_stats, 2503 }; 2504 2505 static struct rpc_xprt_ops xs_udp_ops = { 2506 .set_buffer_size = xs_udp_set_buffer_size, 2507 .reserve_xprt = xprt_reserve_xprt_cong, 2508 .release_xprt = xprt_release_xprt_cong, 2509 .alloc_slot = xprt_alloc_slot, 2510 .rpcbind = rpcb_getport_async, 2511 .set_port = xs_set_port, 2512 .connect = xs_connect, 2513 .buf_alloc = rpc_malloc, 2514 .buf_free = rpc_free, 2515 .send_request = xs_udp_send_request, 2516 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2517 .timer = xs_udp_timer, 2518 .release_request = xprt_release_rqst_cong, 2519 .close = xs_close, 2520 .destroy = xs_destroy, 2521 .print_stats = xs_udp_print_stats, 2522 }; 2523 2524 static struct rpc_xprt_ops xs_tcp_ops = { 2525 .reserve_xprt = xprt_reserve_xprt, 2526 .release_xprt = xs_tcp_release_xprt, 2527 .alloc_slot = xprt_lock_and_alloc_slot, 2528 .rpcbind = rpcb_getport_async, 2529 .set_port = xs_set_port, 2530 .connect = xs_connect, 2531 .buf_alloc = rpc_malloc, 2532 .buf_free = rpc_free, 2533 .send_request = xs_tcp_send_request, 2534 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2535 .close = xs_tcp_close, 2536 .destroy = xs_destroy, 2537 .print_stats = xs_tcp_print_stats, 2538 }; 2539 2540 /* 2541 * The rpc_xprt_ops for the server backchannel 2542 */ 2543 2544 static struct rpc_xprt_ops bc_tcp_ops = { 2545 .reserve_xprt = xprt_reserve_xprt, 2546 .release_xprt = xprt_release_xprt, 2547 .alloc_slot = xprt_alloc_slot, 2548 .buf_alloc = bc_malloc, 2549 .buf_free = bc_free, 2550 .send_request = bc_send_request, 2551 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2552 .close = bc_close, 2553 .destroy = bc_destroy, 2554 .print_stats = xs_tcp_print_stats, 2555 }; 2556 2557 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2558 { 2559 static const struct sockaddr_in sin = { 2560 .sin_family = AF_INET, 2561 .sin_addr.s_addr = htonl(INADDR_ANY), 2562 }; 2563 static const struct sockaddr_in6 sin6 = { 2564 .sin6_family = AF_INET6, 2565 .sin6_addr = IN6ADDR_ANY_INIT, 2566 }; 2567 2568 switch (family) { 2569 case AF_LOCAL: 2570 break; 2571 case AF_INET: 2572 memcpy(sap, &sin, sizeof(sin)); 2573 break; 2574 case AF_INET6: 2575 memcpy(sap, &sin6, sizeof(sin6)); 2576 break; 2577 default: 2578 dprintk("RPC: %s: Bad address family\n", __func__); 2579 return -EAFNOSUPPORT; 2580 } 2581 return 0; 2582 } 2583 2584 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2585 unsigned int slot_table_size, 2586 unsigned int max_slot_table_size) 2587 { 2588 struct rpc_xprt *xprt; 2589 struct sock_xprt *new; 2590 2591 if (args->addrlen > sizeof(xprt->addr)) { 2592 dprintk("RPC: xs_setup_xprt: address too large\n"); 2593 return ERR_PTR(-EBADF); 2594 } 2595 2596 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2597 max_slot_table_size); 2598 if (xprt == NULL) { 2599 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2600 "rpc_xprt\n"); 2601 return ERR_PTR(-ENOMEM); 2602 } 2603 2604 new = container_of(xprt, struct sock_xprt, xprt); 2605 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2606 xprt->addrlen = args->addrlen; 2607 if (args->srcaddr) 2608 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2609 else { 2610 int err; 2611 err = xs_init_anyaddr(args->dstaddr->sa_family, 2612 (struct sockaddr *)&new->srcaddr); 2613 if (err != 0) { 2614 xprt_free(xprt); 2615 return ERR_PTR(err); 2616 } 2617 } 2618 2619 return xprt; 2620 } 2621 2622 static const struct rpc_timeout xs_local_default_timeout = { 2623 .to_initval = 10 * HZ, 2624 .to_maxval = 10 * HZ, 2625 .to_retries = 2, 2626 }; 2627 2628 /** 2629 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2630 * @args: rpc transport creation arguments 2631 * 2632 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2633 */ 2634 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2635 { 2636 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2637 struct sock_xprt *transport; 2638 struct rpc_xprt *xprt; 2639 struct rpc_xprt *ret; 2640 2641 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2642 xprt_max_tcp_slot_table_entries); 2643 if (IS_ERR(xprt)) 2644 return xprt; 2645 transport = container_of(xprt, struct sock_xprt, xprt); 2646 2647 xprt->prot = 0; 2648 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2649 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2650 2651 xprt->bind_timeout = XS_BIND_TO; 2652 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2653 xprt->idle_timeout = XS_IDLE_DISC_TO; 2654 2655 xprt->ops = &xs_local_ops; 2656 xprt->timeout = &xs_local_default_timeout; 2657 2658 switch (sun->sun_family) { 2659 case AF_LOCAL: 2660 if (sun->sun_path[0] != '/') { 2661 dprintk("RPC: bad AF_LOCAL address: %s\n", 2662 sun->sun_path); 2663 ret = ERR_PTR(-EINVAL); 2664 goto out_err; 2665 } 2666 xprt_set_bound(xprt); 2667 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2668 ret = ERR_PTR(xs_local_setup_socket(transport)); 2669 if (ret) 2670 goto out_err; 2671 break; 2672 default: 2673 ret = ERR_PTR(-EAFNOSUPPORT); 2674 goto out_err; 2675 } 2676 2677 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2678 xprt->address_strings[RPC_DISPLAY_ADDR]); 2679 2680 if (try_module_get(THIS_MODULE)) 2681 return xprt; 2682 ret = ERR_PTR(-EINVAL); 2683 out_err: 2684 xprt_free(xprt); 2685 return ret; 2686 } 2687 2688 static const struct rpc_timeout xs_udp_default_timeout = { 2689 .to_initval = 5 * HZ, 2690 .to_maxval = 30 * HZ, 2691 .to_increment = 5 * HZ, 2692 .to_retries = 5, 2693 }; 2694 2695 /** 2696 * xs_setup_udp - Set up transport to use a UDP socket 2697 * @args: rpc transport creation arguments 2698 * 2699 */ 2700 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2701 { 2702 struct sockaddr *addr = args->dstaddr; 2703 struct rpc_xprt *xprt; 2704 struct sock_xprt *transport; 2705 struct rpc_xprt *ret; 2706 2707 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2708 xprt_udp_slot_table_entries); 2709 if (IS_ERR(xprt)) 2710 return xprt; 2711 transport = container_of(xprt, struct sock_xprt, xprt); 2712 2713 xprt->prot = IPPROTO_UDP; 2714 xprt->tsh_size = 0; 2715 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2716 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2717 2718 xprt->bind_timeout = XS_BIND_TO; 2719 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2720 xprt->idle_timeout = XS_IDLE_DISC_TO; 2721 2722 xprt->ops = &xs_udp_ops; 2723 2724 xprt->timeout = &xs_udp_default_timeout; 2725 2726 switch (addr->sa_family) { 2727 case AF_INET: 2728 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2729 xprt_set_bound(xprt); 2730 2731 INIT_DELAYED_WORK(&transport->connect_worker, 2732 xs_udp_setup_socket); 2733 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2734 break; 2735 case AF_INET6: 2736 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2737 xprt_set_bound(xprt); 2738 2739 INIT_DELAYED_WORK(&transport->connect_worker, 2740 xs_udp_setup_socket); 2741 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2742 break; 2743 default: 2744 ret = ERR_PTR(-EAFNOSUPPORT); 2745 goto out_err; 2746 } 2747 2748 if (xprt_bound(xprt)) 2749 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2750 xprt->address_strings[RPC_DISPLAY_ADDR], 2751 xprt->address_strings[RPC_DISPLAY_PORT], 2752 xprt->address_strings[RPC_DISPLAY_PROTO]); 2753 else 2754 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2755 xprt->address_strings[RPC_DISPLAY_ADDR], 2756 xprt->address_strings[RPC_DISPLAY_PROTO]); 2757 2758 if (try_module_get(THIS_MODULE)) 2759 return xprt; 2760 ret = ERR_PTR(-EINVAL); 2761 out_err: 2762 xprt_free(xprt); 2763 return ret; 2764 } 2765 2766 static const struct rpc_timeout xs_tcp_default_timeout = { 2767 .to_initval = 60 * HZ, 2768 .to_maxval = 60 * HZ, 2769 .to_retries = 2, 2770 }; 2771 2772 /** 2773 * xs_setup_tcp - Set up transport to use a TCP socket 2774 * @args: rpc transport creation arguments 2775 * 2776 */ 2777 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2778 { 2779 struct sockaddr *addr = args->dstaddr; 2780 struct rpc_xprt *xprt; 2781 struct sock_xprt *transport; 2782 struct rpc_xprt *ret; 2783 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2784 2785 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2786 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2787 2788 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2789 max_slot_table_size); 2790 if (IS_ERR(xprt)) 2791 return xprt; 2792 transport = container_of(xprt, struct sock_xprt, xprt); 2793 2794 xprt->prot = IPPROTO_TCP; 2795 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2796 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2797 2798 xprt->bind_timeout = XS_BIND_TO; 2799 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2800 xprt->idle_timeout = XS_IDLE_DISC_TO; 2801 2802 xprt->ops = &xs_tcp_ops; 2803 xprt->timeout = &xs_tcp_default_timeout; 2804 2805 switch (addr->sa_family) { 2806 case AF_INET: 2807 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2808 xprt_set_bound(xprt); 2809 2810 INIT_DELAYED_WORK(&transport->connect_worker, 2811 xs_tcp_setup_socket); 2812 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2813 break; 2814 case AF_INET6: 2815 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2816 xprt_set_bound(xprt); 2817 2818 INIT_DELAYED_WORK(&transport->connect_worker, 2819 xs_tcp_setup_socket); 2820 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2821 break; 2822 default: 2823 ret = ERR_PTR(-EAFNOSUPPORT); 2824 goto out_err; 2825 } 2826 2827 if (xprt_bound(xprt)) 2828 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2829 xprt->address_strings[RPC_DISPLAY_ADDR], 2830 xprt->address_strings[RPC_DISPLAY_PORT], 2831 xprt->address_strings[RPC_DISPLAY_PROTO]); 2832 else 2833 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2834 xprt->address_strings[RPC_DISPLAY_ADDR], 2835 xprt->address_strings[RPC_DISPLAY_PROTO]); 2836 2837 2838 if (try_module_get(THIS_MODULE)) 2839 return xprt; 2840 ret = ERR_PTR(-EINVAL); 2841 out_err: 2842 xprt_free(xprt); 2843 return ret; 2844 } 2845 2846 /** 2847 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2848 * @args: rpc transport creation arguments 2849 * 2850 */ 2851 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2852 { 2853 struct sockaddr *addr = args->dstaddr; 2854 struct rpc_xprt *xprt; 2855 struct sock_xprt *transport; 2856 struct svc_sock *bc_sock; 2857 struct rpc_xprt *ret; 2858 2859 if (args->bc_xprt->xpt_bc_xprt) { 2860 /* 2861 * This server connection already has a backchannel 2862 * export; we can't create a new one, as we wouldn't be 2863 * able to match replies based on xid any more. So, 2864 * reuse the already-existing one: 2865 */ 2866 return args->bc_xprt->xpt_bc_xprt; 2867 } 2868 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2869 xprt_tcp_slot_table_entries); 2870 if (IS_ERR(xprt)) 2871 return xprt; 2872 transport = container_of(xprt, struct sock_xprt, xprt); 2873 2874 xprt->prot = IPPROTO_TCP; 2875 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2876 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2877 xprt->timeout = &xs_tcp_default_timeout; 2878 2879 /* backchannel */ 2880 xprt_set_bound(xprt); 2881 xprt->bind_timeout = 0; 2882 xprt->reestablish_timeout = 0; 2883 xprt->idle_timeout = 0; 2884 2885 xprt->ops = &bc_tcp_ops; 2886 2887 switch (addr->sa_family) { 2888 case AF_INET: 2889 xs_format_peer_addresses(xprt, "tcp", 2890 RPCBIND_NETID_TCP); 2891 break; 2892 case AF_INET6: 2893 xs_format_peer_addresses(xprt, "tcp", 2894 RPCBIND_NETID_TCP6); 2895 break; 2896 default: 2897 ret = ERR_PTR(-EAFNOSUPPORT); 2898 goto out_err; 2899 } 2900 2901 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2902 xprt->address_strings[RPC_DISPLAY_ADDR], 2903 xprt->address_strings[RPC_DISPLAY_PORT], 2904 xprt->address_strings[RPC_DISPLAY_PROTO]); 2905 2906 /* 2907 * Once we've associated a backchannel xprt with a connection, 2908 * we want to keep it around as long as long as the connection 2909 * lasts, in case we need to start using it for a backchannel 2910 * again; this reference won't be dropped until bc_xprt is 2911 * destroyed. 2912 */ 2913 xprt_get(xprt); 2914 args->bc_xprt->xpt_bc_xprt = xprt; 2915 xprt->bc_xprt = args->bc_xprt; 2916 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2917 transport->sock = bc_sock->sk_sock; 2918 transport->inet = bc_sock->sk_sk; 2919 2920 /* 2921 * Since we don't want connections for the backchannel, we set 2922 * the xprt status to connected 2923 */ 2924 xprt_set_connected(xprt); 2925 2926 2927 if (try_module_get(THIS_MODULE)) 2928 return xprt; 2929 xprt_put(xprt); 2930 ret = ERR_PTR(-EINVAL); 2931 out_err: 2932 xprt_free(xprt); 2933 return ret; 2934 } 2935 2936 static struct xprt_class xs_local_transport = { 2937 .list = LIST_HEAD_INIT(xs_local_transport.list), 2938 .name = "named UNIX socket", 2939 .owner = THIS_MODULE, 2940 .ident = XPRT_TRANSPORT_LOCAL, 2941 .setup = xs_setup_local, 2942 }; 2943 2944 static struct xprt_class xs_udp_transport = { 2945 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2946 .name = "udp", 2947 .owner = THIS_MODULE, 2948 .ident = XPRT_TRANSPORT_UDP, 2949 .setup = xs_setup_udp, 2950 }; 2951 2952 static struct xprt_class xs_tcp_transport = { 2953 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2954 .name = "tcp", 2955 .owner = THIS_MODULE, 2956 .ident = XPRT_TRANSPORT_TCP, 2957 .setup = xs_setup_tcp, 2958 }; 2959 2960 static struct xprt_class xs_bc_tcp_transport = { 2961 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2962 .name = "tcp NFSv4.1 backchannel", 2963 .owner = THIS_MODULE, 2964 .ident = XPRT_TRANSPORT_BC_TCP, 2965 .setup = xs_setup_bc_tcp, 2966 }; 2967 2968 /** 2969 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2970 * 2971 */ 2972 int init_socket_xprt(void) 2973 { 2974 #ifdef RPC_DEBUG 2975 if (!sunrpc_table_header) 2976 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2977 #endif 2978 2979 xprt_register_transport(&xs_local_transport); 2980 xprt_register_transport(&xs_udp_transport); 2981 xprt_register_transport(&xs_tcp_transport); 2982 xprt_register_transport(&xs_bc_tcp_transport); 2983 2984 return 0; 2985 } 2986 2987 /** 2988 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2989 * 2990 */ 2991 void cleanup_socket_xprt(void) 2992 { 2993 #ifdef RPC_DEBUG 2994 if (sunrpc_table_header) { 2995 unregister_sysctl_table(sunrpc_table_header); 2996 sunrpc_table_header = NULL; 2997 } 2998 #endif 2999 3000 xprt_unregister_transport(&xs_local_transport); 3001 xprt_unregister_transport(&xs_udp_transport); 3002 xprt_unregister_transport(&xs_tcp_transport); 3003 xprt_unregister_transport(&xs_bc_tcp_transport); 3004 } 3005 3006 static int param_set_uint_minmax(const char *val, 3007 const struct kernel_param *kp, 3008 unsigned int min, unsigned int max) 3009 { 3010 unsigned long num; 3011 int ret; 3012 3013 if (!val) 3014 return -EINVAL; 3015 ret = strict_strtoul(val, 0, &num); 3016 if (ret == -EINVAL || num < min || num > max) 3017 return -EINVAL; 3018 *((unsigned int *)kp->arg) = num; 3019 return 0; 3020 } 3021 3022 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3023 { 3024 return param_set_uint_minmax(val, kp, 3025 RPC_MIN_RESVPORT, 3026 RPC_MAX_RESVPORT); 3027 } 3028 3029 static struct kernel_param_ops param_ops_portnr = { 3030 .set = param_set_portnr, 3031 .get = param_get_uint, 3032 }; 3033 3034 #define param_check_portnr(name, p) \ 3035 __param_check(name, p, unsigned int); 3036 3037 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3038 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3039 3040 static int param_set_slot_table_size(const char *val, 3041 const struct kernel_param *kp) 3042 { 3043 return param_set_uint_minmax(val, kp, 3044 RPC_MIN_SLOT_TABLE, 3045 RPC_MAX_SLOT_TABLE); 3046 } 3047 3048 static struct kernel_param_ops param_ops_slot_table_size = { 3049 .set = param_set_slot_table_size, 3050 .get = param_get_uint, 3051 }; 3052 3053 #define param_check_slot_table_size(name, p) \ 3054 __param_check(name, p, unsigned int); 3055 3056 static int param_set_max_slot_table_size(const char *val, 3057 const struct kernel_param *kp) 3058 { 3059 return param_set_uint_minmax(val, kp, 3060 RPC_MIN_SLOT_TABLE, 3061 RPC_MAX_SLOT_TABLE_LIMIT); 3062 } 3063 3064 static struct kernel_param_ops param_ops_max_slot_table_size = { 3065 .set = param_set_max_slot_table_size, 3066 .get = param_get_uint, 3067 }; 3068 3069 #define param_check_max_slot_table_size(name, p) \ 3070 __param_check(name, p, unsigned int); 3071 3072 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3073 slot_table_size, 0644); 3074 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3075 max_slot_table_size, 0644); 3076 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3077 slot_table_size, 0644); 3078 3079