1 /* 2 * linux/net/sunrpc/xprtsock.c 3 * 4 * Client-side transport implementation for sockets. 5 * 6 * TCP callback races fixes (C) 1998 Red Hat 7 * TCP send fixes (C) 1998 Red Hat 8 * TCP NFS related read + write fixes 9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 10 * 11 * Rewrite of larges part of the code in order to stabilize TCP stuff. 12 * Fix behaviour when socket buffer is full. 13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 14 * 15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 16 * 17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 18 * <gilles.quillard@bull.net> 19 */ 20 21 #include <linux/types.h> 22 #include <linux/string.h> 23 #include <linux/slab.h> 24 #include <linux/module.h> 25 #include <linux/capability.h> 26 #include <linux/pagemap.h> 27 #include <linux/errno.h> 28 #include <linux/socket.h> 29 #include <linux/in.h> 30 #include <linux/net.h> 31 #include <linux/mm.h> 32 #include <linux/un.h> 33 #include <linux/udp.h> 34 #include <linux/tcp.h> 35 #include <linux/sunrpc/clnt.h> 36 #include <linux/sunrpc/sched.h> 37 #include <linux/sunrpc/svcsock.h> 38 #include <linux/sunrpc/xprtsock.h> 39 #include <linux/file.h> 40 #ifdef CONFIG_SUNRPC_BACKCHANNEL 41 #include <linux/sunrpc/bc_xprt.h> 42 #endif 43 44 #include <net/sock.h> 45 #include <net/checksum.h> 46 #include <net/udp.h> 47 #include <net/tcp.h> 48 49 #include "sunrpc.h" 50 51 static void xs_close(struct rpc_xprt *xprt); 52 53 /* 54 * xprtsock tunables 55 */ 56 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 57 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 58 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 59 60 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 61 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 62 63 #define XS_TCP_LINGER_TO (15U * HZ) 64 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 65 66 /* 67 * We can register our own files under /proc/sys/sunrpc by 68 * calling register_sysctl_table() again. The files in that 69 * directory become the union of all files registered there. 70 * 71 * We simply need to make sure that we don't collide with 72 * someone else's file names! 73 */ 74 75 #ifdef RPC_DEBUG 76 77 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 78 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 79 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 80 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 81 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 82 83 static struct ctl_table_header *sunrpc_table_header; 84 85 /* 86 * FIXME: changing the UDP slot table size should also resize the UDP 87 * socket buffers for existing UDP transports 88 */ 89 static ctl_table xs_tunables_table[] = { 90 { 91 .procname = "udp_slot_table_entries", 92 .data = &xprt_udp_slot_table_entries, 93 .maxlen = sizeof(unsigned int), 94 .mode = 0644, 95 .proc_handler = proc_dointvec_minmax, 96 .extra1 = &min_slot_table_size, 97 .extra2 = &max_slot_table_size 98 }, 99 { 100 .procname = "tcp_slot_table_entries", 101 .data = &xprt_tcp_slot_table_entries, 102 .maxlen = sizeof(unsigned int), 103 .mode = 0644, 104 .proc_handler = proc_dointvec_minmax, 105 .extra1 = &min_slot_table_size, 106 .extra2 = &max_slot_table_size 107 }, 108 { 109 .procname = "tcp_max_slot_table_entries", 110 .data = &xprt_max_tcp_slot_table_entries, 111 .maxlen = sizeof(unsigned int), 112 .mode = 0644, 113 .proc_handler = proc_dointvec_minmax, 114 .extra1 = &min_slot_table_size, 115 .extra2 = &max_tcp_slot_table_limit 116 }, 117 { 118 .procname = "min_resvport", 119 .data = &xprt_min_resvport, 120 .maxlen = sizeof(unsigned int), 121 .mode = 0644, 122 .proc_handler = proc_dointvec_minmax, 123 .extra1 = &xprt_min_resvport_limit, 124 .extra2 = &xprt_max_resvport_limit 125 }, 126 { 127 .procname = "max_resvport", 128 .data = &xprt_max_resvport, 129 .maxlen = sizeof(unsigned int), 130 .mode = 0644, 131 .proc_handler = proc_dointvec_minmax, 132 .extra1 = &xprt_min_resvport_limit, 133 .extra2 = &xprt_max_resvport_limit 134 }, 135 { 136 .procname = "tcp_fin_timeout", 137 .data = &xs_tcp_fin_timeout, 138 .maxlen = sizeof(xs_tcp_fin_timeout), 139 .mode = 0644, 140 .proc_handler = proc_dointvec_jiffies, 141 }, 142 { }, 143 }; 144 145 static ctl_table sunrpc_table[] = { 146 { 147 .procname = "sunrpc", 148 .mode = 0555, 149 .child = xs_tunables_table 150 }, 151 { }, 152 }; 153 154 #endif 155 156 /* 157 * Wait duration for a reply from the RPC portmapper. 158 */ 159 #define XS_BIND_TO (60U * HZ) 160 161 /* 162 * Delay if a UDP socket connect error occurs. This is most likely some 163 * kind of resource problem on the local host. 164 */ 165 #define XS_UDP_REEST_TO (2U * HZ) 166 167 /* 168 * The reestablish timeout allows clients to delay for a bit before attempting 169 * to reconnect to a server that just dropped our connection. 170 * 171 * We implement an exponential backoff when trying to reestablish a TCP 172 * transport connection with the server. Some servers like to drop a TCP 173 * connection when they are overworked, so we start with a short timeout and 174 * increase over time if the server is down or not responding. 175 */ 176 #define XS_TCP_INIT_REEST_TO (3U * HZ) 177 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 178 179 /* 180 * TCP idle timeout; client drops the transport socket if it is idle 181 * for this long. Note that we also timeout UDP sockets to prevent 182 * holding port numbers when there is no RPC traffic. 183 */ 184 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 185 186 #ifdef RPC_DEBUG 187 # undef RPC_DEBUG_DATA 188 # define RPCDBG_FACILITY RPCDBG_TRANS 189 #endif 190 191 #ifdef RPC_DEBUG_DATA 192 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 193 { 194 u8 *buf = (u8 *) packet; 195 int j; 196 197 dprintk("RPC: %s\n", msg); 198 for (j = 0; j < count && j < 128; j += 4) { 199 if (!(j & 31)) { 200 if (j) 201 dprintk("\n"); 202 dprintk("0x%04x ", j); 203 } 204 dprintk("%02x%02x%02x%02x ", 205 buf[j], buf[j+1], buf[j+2], buf[j+3]); 206 } 207 dprintk("\n"); 208 } 209 #else 210 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 211 { 212 /* NOP */ 213 } 214 #endif 215 216 struct sock_xprt { 217 struct rpc_xprt xprt; 218 219 /* 220 * Network layer 221 */ 222 struct socket * sock; 223 struct sock * inet; 224 225 /* 226 * State of TCP reply receive 227 */ 228 __be32 tcp_fraghdr, 229 tcp_xid, 230 tcp_calldir; 231 232 u32 tcp_offset, 233 tcp_reclen; 234 235 unsigned long tcp_copied, 236 tcp_flags; 237 238 /* 239 * Connection of transports 240 */ 241 struct delayed_work connect_worker; 242 struct sockaddr_storage srcaddr; 243 unsigned short srcport; 244 245 /* 246 * UDP socket buffer size parameters 247 */ 248 size_t rcvsize, 249 sndsize; 250 251 /* 252 * Saved socket callback addresses 253 */ 254 void (*old_data_ready)(struct sock *, int); 255 void (*old_state_change)(struct sock *); 256 void (*old_write_space)(struct sock *); 257 void (*old_error_report)(struct sock *); 258 }; 259 260 /* 261 * TCP receive state flags 262 */ 263 #define TCP_RCV_LAST_FRAG (1UL << 0) 264 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 265 #define TCP_RCV_COPY_XID (1UL << 2) 266 #define TCP_RCV_COPY_DATA (1UL << 3) 267 #define TCP_RCV_READ_CALLDIR (1UL << 4) 268 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 269 270 /* 271 * TCP RPC flags 272 */ 273 #define TCP_RPC_REPLY (1UL << 6) 274 275 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 276 { 277 return (struct sockaddr *) &xprt->addr; 278 } 279 280 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 281 { 282 return (struct sockaddr_un *) &xprt->addr; 283 } 284 285 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 286 { 287 return (struct sockaddr_in *) &xprt->addr; 288 } 289 290 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 291 { 292 return (struct sockaddr_in6 *) &xprt->addr; 293 } 294 295 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 296 { 297 struct sockaddr *sap = xs_addr(xprt); 298 struct sockaddr_in6 *sin6; 299 struct sockaddr_in *sin; 300 struct sockaddr_un *sun; 301 char buf[128]; 302 303 switch (sap->sa_family) { 304 case AF_LOCAL: 305 sun = xs_addr_un(xprt); 306 strlcpy(buf, sun->sun_path, sizeof(buf)); 307 xprt->address_strings[RPC_DISPLAY_ADDR] = 308 kstrdup(buf, GFP_KERNEL); 309 break; 310 case AF_INET: 311 (void)rpc_ntop(sap, buf, sizeof(buf)); 312 xprt->address_strings[RPC_DISPLAY_ADDR] = 313 kstrdup(buf, GFP_KERNEL); 314 sin = xs_addr_in(xprt); 315 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 316 break; 317 case AF_INET6: 318 (void)rpc_ntop(sap, buf, sizeof(buf)); 319 xprt->address_strings[RPC_DISPLAY_ADDR] = 320 kstrdup(buf, GFP_KERNEL); 321 sin6 = xs_addr_in6(xprt); 322 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 323 break; 324 default: 325 BUG(); 326 } 327 328 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 329 } 330 331 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 332 { 333 struct sockaddr *sap = xs_addr(xprt); 334 char buf[128]; 335 336 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 337 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 338 339 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 340 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 341 } 342 343 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 344 const char *protocol, 345 const char *netid) 346 { 347 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 348 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 349 xs_format_common_peer_addresses(xprt); 350 xs_format_common_peer_ports(xprt); 351 } 352 353 static void xs_update_peer_port(struct rpc_xprt *xprt) 354 { 355 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 356 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 357 358 xs_format_common_peer_ports(xprt); 359 } 360 361 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 362 { 363 unsigned int i; 364 365 for (i = 0; i < RPC_DISPLAY_MAX; i++) 366 switch (i) { 367 case RPC_DISPLAY_PROTO: 368 case RPC_DISPLAY_NETID: 369 continue; 370 default: 371 kfree(xprt->address_strings[i]); 372 } 373 } 374 375 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 376 377 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 378 { 379 struct msghdr msg = { 380 .msg_name = addr, 381 .msg_namelen = addrlen, 382 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 383 }; 384 struct kvec iov = { 385 .iov_base = vec->iov_base + base, 386 .iov_len = vec->iov_len - base, 387 }; 388 389 if (iov.iov_len != 0) 390 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 391 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 392 } 393 394 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 395 { 396 struct page **ppage; 397 unsigned int remainder; 398 int err, sent = 0; 399 400 remainder = xdr->page_len - base; 401 base += xdr->page_base; 402 ppage = xdr->pages + (base >> PAGE_SHIFT); 403 base &= ~PAGE_MASK; 404 for(;;) { 405 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 406 int flags = XS_SENDMSG_FLAGS; 407 408 remainder -= len; 409 if (remainder != 0 || more) 410 flags |= MSG_MORE; 411 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 412 if (remainder == 0 || err != len) 413 break; 414 sent += err; 415 ppage++; 416 base = 0; 417 } 418 if (sent == 0) 419 return err; 420 if (err > 0) 421 sent += err; 422 return sent; 423 } 424 425 /** 426 * xs_sendpages - write pages directly to a socket 427 * @sock: socket to send on 428 * @addr: UDP only -- address of destination 429 * @addrlen: UDP only -- length of destination address 430 * @xdr: buffer containing this request 431 * @base: starting position in the buffer 432 * 433 */ 434 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 435 { 436 unsigned int remainder = xdr->len - base; 437 int err, sent = 0; 438 439 if (unlikely(!sock)) 440 return -ENOTSOCK; 441 442 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 443 if (base != 0) { 444 addr = NULL; 445 addrlen = 0; 446 } 447 448 if (base < xdr->head[0].iov_len || addr != NULL) { 449 unsigned int len = xdr->head[0].iov_len - base; 450 remainder -= len; 451 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 452 if (remainder == 0 || err != len) 453 goto out; 454 sent += err; 455 base = 0; 456 } else 457 base -= xdr->head[0].iov_len; 458 459 if (base < xdr->page_len) { 460 unsigned int len = xdr->page_len - base; 461 remainder -= len; 462 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 463 if (remainder == 0 || err != len) 464 goto out; 465 sent += err; 466 base = 0; 467 } else 468 base -= xdr->page_len; 469 470 if (base >= xdr->tail[0].iov_len) 471 return sent; 472 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 473 out: 474 if (sent == 0) 475 return err; 476 if (err > 0) 477 sent += err; 478 return sent; 479 } 480 481 static void xs_nospace_callback(struct rpc_task *task) 482 { 483 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 484 485 transport->inet->sk_write_pending--; 486 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 487 } 488 489 /** 490 * xs_nospace - place task on wait queue if transmit was incomplete 491 * @task: task to put to sleep 492 * 493 */ 494 static int xs_nospace(struct rpc_task *task) 495 { 496 struct rpc_rqst *req = task->tk_rqstp; 497 struct rpc_xprt *xprt = req->rq_xprt; 498 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 499 int ret = -EAGAIN; 500 501 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 502 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 503 req->rq_slen); 504 505 /* Protect against races with write_space */ 506 spin_lock_bh(&xprt->transport_lock); 507 508 /* Don't race with disconnect */ 509 if (xprt_connected(xprt)) { 510 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 511 /* 512 * Notify TCP that we're limited by the application 513 * window size 514 */ 515 set_bit(SOCK_NOSPACE, &transport->sock->flags); 516 transport->inet->sk_write_pending++; 517 /* ...and wait for more buffer space */ 518 xprt_wait_for_buffer_space(task, xs_nospace_callback); 519 } 520 } else { 521 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 522 ret = -ENOTCONN; 523 } 524 525 spin_unlock_bh(&xprt->transport_lock); 526 return ret; 527 } 528 529 /* 530 * Construct a stream transport record marker in @buf. 531 */ 532 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 533 { 534 u32 reclen = buf->len - sizeof(rpc_fraghdr); 535 rpc_fraghdr *base = buf->head[0].iov_base; 536 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 537 } 538 539 /** 540 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 541 * @task: RPC task that manages the state of an RPC request 542 * 543 * Return values: 544 * 0: The request has been sent 545 * EAGAIN: The socket was blocked, please call again later to 546 * complete the request 547 * ENOTCONN: Caller needs to invoke connect logic then call again 548 * other: Some other error occured, the request was not sent 549 */ 550 static int xs_local_send_request(struct rpc_task *task) 551 { 552 struct rpc_rqst *req = task->tk_rqstp; 553 struct rpc_xprt *xprt = req->rq_xprt; 554 struct sock_xprt *transport = 555 container_of(xprt, struct sock_xprt, xprt); 556 struct xdr_buf *xdr = &req->rq_snd_buf; 557 int status; 558 559 xs_encode_stream_record_marker(&req->rq_snd_buf); 560 561 xs_pktdump("packet data:", 562 req->rq_svec->iov_base, req->rq_svec->iov_len); 563 564 status = xs_sendpages(transport->sock, NULL, 0, 565 xdr, req->rq_bytes_sent); 566 dprintk("RPC: %s(%u) = %d\n", 567 __func__, xdr->len - req->rq_bytes_sent, status); 568 if (likely(status >= 0)) { 569 req->rq_bytes_sent += status; 570 req->rq_xmit_bytes_sent += status; 571 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 572 req->rq_bytes_sent = 0; 573 return 0; 574 } 575 status = -EAGAIN; 576 } 577 578 switch (status) { 579 case -EAGAIN: 580 status = xs_nospace(task); 581 break; 582 default: 583 dprintk("RPC: sendmsg returned unrecognized error %d\n", 584 -status); 585 case -EPIPE: 586 xs_close(xprt); 587 status = -ENOTCONN; 588 } 589 590 return status; 591 } 592 593 /** 594 * xs_udp_send_request - write an RPC request to a UDP socket 595 * @task: address of RPC task that manages the state of an RPC request 596 * 597 * Return values: 598 * 0: The request has been sent 599 * EAGAIN: The socket was blocked, please call again later to 600 * complete the request 601 * ENOTCONN: Caller needs to invoke connect logic then call again 602 * other: Some other error occurred, the request was not sent 603 */ 604 static int xs_udp_send_request(struct rpc_task *task) 605 { 606 struct rpc_rqst *req = task->tk_rqstp; 607 struct rpc_xprt *xprt = req->rq_xprt; 608 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 609 struct xdr_buf *xdr = &req->rq_snd_buf; 610 int status; 611 612 xs_pktdump("packet data:", 613 req->rq_svec->iov_base, 614 req->rq_svec->iov_len); 615 616 if (!xprt_bound(xprt)) 617 return -ENOTCONN; 618 status = xs_sendpages(transport->sock, 619 xs_addr(xprt), 620 xprt->addrlen, xdr, 621 req->rq_bytes_sent); 622 623 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 624 xdr->len - req->rq_bytes_sent, status); 625 626 if (status >= 0) { 627 req->rq_xmit_bytes_sent += status; 628 if (status >= req->rq_slen) 629 return 0; 630 /* Still some bytes left; set up for a retry later. */ 631 status = -EAGAIN; 632 } 633 634 switch (status) { 635 case -ENOTSOCK: 636 status = -ENOTCONN; 637 /* Should we call xs_close() here? */ 638 break; 639 case -EAGAIN: 640 status = xs_nospace(task); 641 break; 642 default: 643 dprintk("RPC: sendmsg returned unrecognized error %d\n", 644 -status); 645 case -ENETUNREACH: 646 case -EPIPE: 647 case -ECONNREFUSED: 648 /* When the server has died, an ICMP port unreachable message 649 * prompts ECONNREFUSED. */ 650 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 651 } 652 653 return status; 654 } 655 656 /** 657 * xs_tcp_shutdown - gracefully shut down a TCP socket 658 * @xprt: transport 659 * 660 * Initiates a graceful shutdown of the TCP socket by calling the 661 * equivalent of shutdown(SHUT_WR); 662 */ 663 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 664 { 665 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 666 struct socket *sock = transport->sock; 667 668 if (sock != NULL) 669 kernel_sock_shutdown(sock, SHUT_WR); 670 } 671 672 /** 673 * xs_tcp_send_request - write an RPC request to a TCP socket 674 * @task: address of RPC task that manages the state of an RPC request 675 * 676 * Return values: 677 * 0: The request has been sent 678 * EAGAIN: The socket was blocked, please call again later to 679 * complete the request 680 * ENOTCONN: Caller needs to invoke connect logic then call again 681 * other: Some other error occurred, the request was not sent 682 * 683 * XXX: In the case of soft timeouts, should we eventually give up 684 * if sendmsg is not able to make progress? 685 */ 686 static int xs_tcp_send_request(struct rpc_task *task) 687 { 688 struct rpc_rqst *req = task->tk_rqstp; 689 struct rpc_xprt *xprt = req->rq_xprt; 690 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 691 struct xdr_buf *xdr = &req->rq_snd_buf; 692 int status; 693 694 xs_encode_stream_record_marker(&req->rq_snd_buf); 695 696 xs_pktdump("packet data:", 697 req->rq_svec->iov_base, 698 req->rq_svec->iov_len); 699 700 /* Continue transmitting the packet/record. We must be careful 701 * to cope with writespace callbacks arriving _after_ we have 702 * called sendmsg(). */ 703 while (1) { 704 status = xs_sendpages(transport->sock, 705 NULL, 0, xdr, req->rq_bytes_sent); 706 707 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 708 xdr->len - req->rq_bytes_sent, status); 709 710 if (unlikely(status < 0)) 711 break; 712 713 /* If we've sent the entire packet, immediately 714 * reset the count of bytes sent. */ 715 req->rq_bytes_sent += status; 716 req->rq_xmit_bytes_sent += status; 717 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 718 req->rq_bytes_sent = 0; 719 return 0; 720 } 721 722 if (status != 0) 723 continue; 724 status = -EAGAIN; 725 break; 726 } 727 728 switch (status) { 729 case -ENOTSOCK: 730 status = -ENOTCONN; 731 /* Should we call xs_close() here? */ 732 break; 733 case -EAGAIN: 734 status = xs_nospace(task); 735 break; 736 default: 737 dprintk("RPC: sendmsg returned unrecognized error %d\n", 738 -status); 739 case -ECONNRESET: 740 case -EPIPE: 741 xs_tcp_shutdown(xprt); 742 case -ECONNREFUSED: 743 case -ENOTCONN: 744 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 745 } 746 747 return status; 748 } 749 750 /** 751 * xs_tcp_release_xprt - clean up after a tcp transmission 752 * @xprt: transport 753 * @task: rpc task 754 * 755 * This cleans up if an error causes us to abort the transmission of a request. 756 * In this case, the socket may need to be reset in order to avoid confusing 757 * the server. 758 */ 759 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 760 { 761 struct rpc_rqst *req; 762 763 if (task != xprt->snd_task) 764 return; 765 if (task == NULL) 766 goto out_release; 767 req = task->tk_rqstp; 768 if (req == NULL) 769 goto out_release; 770 if (req->rq_bytes_sent == 0) 771 goto out_release; 772 if (req->rq_bytes_sent == req->rq_snd_buf.len) 773 goto out_release; 774 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 775 out_release: 776 xprt_release_xprt(xprt, task); 777 } 778 779 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 780 { 781 transport->old_data_ready = sk->sk_data_ready; 782 transport->old_state_change = sk->sk_state_change; 783 transport->old_write_space = sk->sk_write_space; 784 transport->old_error_report = sk->sk_error_report; 785 } 786 787 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 788 { 789 sk->sk_data_ready = transport->old_data_ready; 790 sk->sk_state_change = transport->old_state_change; 791 sk->sk_write_space = transport->old_write_space; 792 sk->sk_error_report = transport->old_error_report; 793 } 794 795 static void xs_reset_transport(struct sock_xprt *transport) 796 { 797 struct socket *sock = transport->sock; 798 struct sock *sk = transport->inet; 799 800 if (sk == NULL) 801 return; 802 803 transport->srcport = 0; 804 805 write_lock_bh(&sk->sk_callback_lock); 806 transport->inet = NULL; 807 transport->sock = NULL; 808 809 sk->sk_user_data = NULL; 810 811 xs_restore_old_callbacks(transport, sk); 812 write_unlock_bh(&sk->sk_callback_lock); 813 814 sk->sk_no_check = 0; 815 816 sock_release(sock); 817 } 818 819 /** 820 * xs_close - close a socket 821 * @xprt: transport 822 * 823 * This is used when all requests are complete; ie, no DRC state remains 824 * on the server we want to save. 825 * 826 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 827 * xs_reset_transport() zeroing the socket from underneath a writer. 828 */ 829 static void xs_close(struct rpc_xprt *xprt) 830 { 831 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 832 833 dprintk("RPC: xs_close xprt %p\n", xprt); 834 835 xs_reset_transport(transport); 836 xprt->reestablish_timeout = 0; 837 838 smp_mb__before_clear_bit(); 839 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 840 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 841 clear_bit(XPRT_CLOSING, &xprt->state); 842 smp_mb__after_clear_bit(); 843 xprt_disconnect_done(xprt); 844 } 845 846 static void xs_tcp_close(struct rpc_xprt *xprt) 847 { 848 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 849 xs_close(xprt); 850 else 851 xs_tcp_shutdown(xprt); 852 } 853 854 /** 855 * xs_destroy - prepare to shutdown a transport 856 * @xprt: doomed transport 857 * 858 */ 859 static void xs_destroy(struct rpc_xprt *xprt) 860 { 861 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 862 863 dprintk("RPC: xs_destroy xprt %p\n", xprt); 864 865 cancel_delayed_work_sync(&transport->connect_worker); 866 867 xs_close(xprt); 868 xs_free_peer_addresses(xprt); 869 xprt_free(xprt); 870 module_put(THIS_MODULE); 871 } 872 873 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 874 { 875 return (struct rpc_xprt *) sk->sk_user_data; 876 } 877 878 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 879 { 880 struct xdr_skb_reader desc = { 881 .skb = skb, 882 .offset = sizeof(rpc_fraghdr), 883 .count = skb->len - sizeof(rpc_fraghdr), 884 }; 885 886 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 887 return -1; 888 if (desc.count) 889 return -1; 890 return 0; 891 } 892 893 /** 894 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 895 * @sk: socket with data to read 896 * @len: how much data to read 897 * 898 * Currently this assumes we can read the whole reply in a single gulp. 899 */ 900 static void xs_local_data_ready(struct sock *sk, int len) 901 { 902 struct rpc_task *task; 903 struct rpc_xprt *xprt; 904 struct rpc_rqst *rovr; 905 struct sk_buff *skb; 906 int err, repsize, copied; 907 u32 _xid; 908 __be32 *xp; 909 910 read_lock_bh(&sk->sk_callback_lock); 911 dprintk("RPC: %s...\n", __func__); 912 xprt = xprt_from_sock(sk); 913 if (xprt == NULL) 914 goto out; 915 916 skb = skb_recv_datagram(sk, 0, 1, &err); 917 if (skb == NULL) 918 goto out; 919 920 repsize = skb->len - sizeof(rpc_fraghdr); 921 if (repsize < 4) { 922 dprintk("RPC: impossible RPC reply size %d\n", repsize); 923 goto dropit; 924 } 925 926 /* Copy the XID from the skb... */ 927 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 928 if (xp == NULL) 929 goto dropit; 930 931 /* Look up and lock the request corresponding to the given XID */ 932 spin_lock(&xprt->transport_lock); 933 rovr = xprt_lookup_rqst(xprt, *xp); 934 if (!rovr) 935 goto out_unlock; 936 task = rovr->rq_task; 937 938 copied = rovr->rq_private_buf.buflen; 939 if (copied > repsize) 940 copied = repsize; 941 942 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 943 dprintk("RPC: sk_buff copy failed\n"); 944 goto out_unlock; 945 } 946 947 xprt_complete_rqst(task, copied); 948 949 out_unlock: 950 spin_unlock(&xprt->transport_lock); 951 dropit: 952 skb_free_datagram(sk, skb); 953 out: 954 read_unlock_bh(&sk->sk_callback_lock); 955 } 956 957 /** 958 * xs_udp_data_ready - "data ready" callback for UDP sockets 959 * @sk: socket with data to read 960 * @len: how much data to read 961 * 962 */ 963 static void xs_udp_data_ready(struct sock *sk, int len) 964 { 965 struct rpc_task *task; 966 struct rpc_xprt *xprt; 967 struct rpc_rqst *rovr; 968 struct sk_buff *skb; 969 int err, repsize, copied; 970 u32 _xid; 971 __be32 *xp; 972 973 read_lock_bh(&sk->sk_callback_lock); 974 dprintk("RPC: xs_udp_data_ready...\n"); 975 if (!(xprt = xprt_from_sock(sk))) 976 goto out; 977 978 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 979 goto out; 980 981 repsize = skb->len - sizeof(struct udphdr); 982 if (repsize < 4) { 983 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 984 goto dropit; 985 } 986 987 /* Copy the XID from the skb... */ 988 xp = skb_header_pointer(skb, sizeof(struct udphdr), 989 sizeof(_xid), &_xid); 990 if (xp == NULL) 991 goto dropit; 992 993 /* Look up and lock the request corresponding to the given XID */ 994 spin_lock(&xprt->transport_lock); 995 rovr = xprt_lookup_rqst(xprt, *xp); 996 if (!rovr) 997 goto out_unlock; 998 task = rovr->rq_task; 999 1000 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1001 copied = repsize; 1002 1003 /* Suck it into the iovec, verify checksum if not done by hw. */ 1004 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1005 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1006 goto out_unlock; 1007 } 1008 1009 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1010 1011 xprt_adjust_cwnd(task, copied); 1012 xprt_complete_rqst(task, copied); 1013 1014 out_unlock: 1015 spin_unlock(&xprt->transport_lock); 1016 dropit: 1017 skb_free_datagram(sk, skb); 1018 out: 1019 read_unlock_bh(&sk->sk_callback_lock); 1020 } 1021 1022 /* 1023 * Helper function to force a TCP close if the server is sending 1024 * junk and/or it has put us in CLOSE_WAIT 1025 */ 1026 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1027 { 1028 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1029 xprt_force_disconnect(xprt); 1030 } 1031 1032 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1033 { 1034 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1035 size_t len, used; 1036 char *p; 1037 1038 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1039 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1040 used = xdr_skb_read_bits(desc, p, len); 1041 transport->tcp_offset += used; 1042 if (used != len) 1043 return; 1044 1045 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1046 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1047 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1048 else 1049 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1050 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1051 1052 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1053 transport->tcp_offset = 0; 1054 1055 /* Sanity check of the record length */ 1056 if (unlikely(transport->tcp_reclen < 8)) { 1057 dprintk("RPC: invalid TCP record fragment length\n"); 1058 xs_tcp_force_close(xprt); 1059 return; 1060 } 1061 dprintk("RPC: reading TCP record fragment of length %d\n", 1062 transport->tcp_reclen); 1063 } 1064 1065 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1066 { 1067 if (transport->tcp_offset == transport->tcp_reclen) { 1068 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1069 transport->tcp_offset = 0; 1070 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1071 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1072 transport->tcp_flags |= TCP_RCV_COPY_XID; 1073 transport->tcp_copied = 0; 1074 } 1075 } 1076 } 1077 1078 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1079 { 1080 size_t len, used; 1081 char *p; 1082 1083 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1084 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1085 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1086 used = xdr_skb_read_bits(desc, p, len); 1087 transport->tcp_offset += used; 1088 if (used != len) 1089 return; 1090 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1091 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1092 transport->tcp_copied = 4; 1093 dprintk("RPC: reading %s XID %08x\n", 1094 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1095 : "request with", 1096 ntohl(transport->tcp_xid)); 1097 xs_tcp_check_fraghdr(transport); 1098 } 1099 1100 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1101 struct xdr_skb_reader *desc) 1102 { 1103 size_t len, used; 1104 u32 offset; 1105 char *p; 1106 1107 /* 1108 * We want transport->tcp_offset to be 8 at the end of this routine 1109 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1110 * When this function is called for the first time, 1111 * transport->tcp_offset is 4 (after having already read the xid). 1112 */ 1113 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1114 len = sizeof(transport->tcp_calldir) - offset; 1115 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1116 p = ((char *) &transport->tcp_calldir) + offset; 1117 used = xdr_skb_read_bits(desc, p, len); 1118 transport->tcp_offset += used; 1119 if (used != len) 1120 return; 1121 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1122 /* 1123 * We don't yet have the XDR buffer, so we will write the calldir 1124 * out after we get the buffer from the 'struct rpc_rqst' 1125 */ 1126 switch (ntohl(transport->tcp_calldir)) { 1127 case RPC_REPLY: 1128 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1129 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1130 transport->tcp_flags |= TCP_RPC_REPLY; 1131 break; 1132 case RPC_CALL: 1133 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1134 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1135 transport->tcp_flags &= ~TCP_RPC_REPLY; 1136 break; 1137 default: 1138 dprintk("RPC: invalid request message type\n"); 1139 xs_tcp_force_close(&transport->xprt); 1140 } 1141 xs_tcp_check_fraghdr(transport); 1142 } 1143 1144 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1145 struct xdr_skb_reader *desc, 1146 struct rpc_rqst *req) 1147 { 1148 struct sock_xprt *transport = 1149 container_of(xprt, struct sock_xprt, xprt); 1150 struct xdr_buf *rcvbuf; 1151 size_t len; 1152 ssize_t r; 1153 1154 rcvbuf = &req->rq_private_buf; 1155 1156 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1157 /* 1158 * Save the RPC direction in the XDR buffer 1159 */ 1160 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1161 &transport->tcp_calldir, 1162 sizeof(transport->tcp_calldir)); 1163 transport->tcp_copied += sizeof(transport->tcp_calldir); 1164 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1165 } 1166 1167 len = desc->count; 1168 if (len > transport->tcp_reclen - transport->tcp_offset) { 1169 struct xdr_skb_reader my_desc; 1170 1171 len = transport->tcp_reclen - transport->tcp_offset; 1172 memcpy(&my_desc, desc, sizeof(my_desc)); 1173 my_desc.count = len; 1174 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1175 &my_desc, xdr_skb_read_bits); 1176 desc->count -= r; 1177 desc->offset += r; 1178 } else 1179 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1180 desc, xdr_skb_read_bits); 1181 1182 if (r > 0) { 1183 transport->tcp_copied += r; 1184 transport->tcp_offset += r; 1185 } 1186 if (r != len) { 1187 /* Error when copying to the receive buffer, 1188 * usually because we weren't able to allocate 1189 * additional buffer pages. All we can do now 1190 * is turn off TCP_RCV_COPY_DATA, so the request 1191 * will not receive any additional updates, 1192 * and time out. 1193 * Any remaining data from this record will 1194 * be discarded. 1195 */ 1196 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1197 dprintk("RPC: XID %08x truncated request\n", 1198 ntohl(transport->tcp_xid)); 1199 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1200 "tcp_offset = %u, tcp_reclen = %u\n", 1201 xprt, transport->tcp_copied, 1202 transport->tcp_offset, transport->tcp_reclen); 1203 return; 1204 } 1205 1206 dprintk("RPC: XID %08x read %Zd bytes\n", 1207 ntohl(transport->tcp_xid), r); 1208 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1209 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1210 transport->tcp_offset, transport->tcp_reclen); 1211 1212 if (transport->tcp_copied == req->rq_private_buf.buflen) 1213 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1214 else if (transport->tcp_offset == transport->tcp_reclen) { 1215 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1216 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1217 } 1218 } 1219 1220 /* 1221 * Finds the request corresponding to the RPC xid and invokes the common 1222 * tcp read code to read the data. 1223 */ 1224 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1225 struct xdr_skb_reader *desc) 1226 { 1227 struct sock_xprt *transport = 1228 container_of(xprt, struct sock_xprt, xprt); 1229 struct rpc_rqst *req; 1230 1231 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1232 1233 /* Find and lock the request corresponding to this xid */ 1234 spin_lock(&xprt->transport_lock); 1235 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1236 if (!req) { 1237 dprintk("RPC: XID %08x request not found!\n", 1238 ntohl(transport->tcp_xid)); 1239 spin_unlock(&xprt->transport_lock); 1240 return -1; 1241 } 1242 1243 xs_tcp_read_common(xprt, desc, req); 1244 1245 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1246 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1247 1248 spin_unlock(&xprt->transport_lock); 1249 return 0; 1250 } 1251 1252 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1253 /* 1254 * Obtains an rpc_rqst previously allocated and invokes the common 1255 * tcp read code to read the data. The result is placed in the callback 1256 * queue. 1257 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1258 * connection and return -1. 1259 */ 1260 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1261 struct xdr_skb_reader *desc) 1262 { 1263 struct sock_xprt *transport = 1264 container_of(xprt, struct sock_xprt, xprt); 1265 struct rpc_rqst *req; 1266 1267 req = xprt_alloc_bc_request(xprt); 1268 if (req == NULL) { 1269 printk(KERN_WARNING "Callback slot table overflowed\n"); 1270 xprt_force_disconnect(xprt); 1271 return -1; 1272 } 1273 1274 req->rq_xid = transport->tcp_xid; 1275 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1276 xs_tcp_read_common(xprt, desc, req); 1277 1278 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1279 struct svc_serv *bc_serv = xprt->bc_serv; 1280 1281 /* 1282 * Add callback request to callback list. The callback 1283 * service sleeps on the sv_cb_waitq waiting for new 1284 * requests. Wake it up after adding enqueing the 1285 * request. 1286 */ 1287 dprintk("RPC: add callback request to list\n"); 1288 spin_lock(&bc_serv->sv_cb_lock); 1289 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1290 spin_unlock(&bc_serv->sv_cb_lock); 1291 wake_up(&bc_serv->sv_cb_waitq); 1292 } 1293 1294 req->rq_private_buf.len = transport->tcp_copied; 1295 1296 return 0; 1297 } 1298 1299 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1300 struct xdr_skb_reader *desc) 1301 { 1302 struct sock_xprt *transport = 1303 container_of(xprt, struct sock_xprt, xprt); 1304 1305 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1306 xs_tcp_read_reply(xprt, desc) : 1307 xs_tcp_read_callback(xprt, desc); 1308 } 1309 #else 1310 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1311 struct xdr_skb_reader *desc) 1312 { 1313 return xs_tcp_read_reply(xprt, desc); 1314 } 1315 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1316 1317 /* 1318 * Read data off the transport. This can be either an RPC_CALL or an 1319 * RPC_REPLY. Relay the processing to helper functions. 1320 */ 1321 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1322 struct xdr_skb_reader *desc) 1323 { 1324 struct sock_xprt *transport = 1325 container_of(xprt, struct sock_xprt, xprt); 1326 1327 if (_xs_tcp_read_data(xprt, desc) == 0) 1328 xs_tcp_check_fraghdr(transport); 1329 else { 1330 /* 1331 * The transport_lock protects the request handling. 1332 * There's no need to hold it to update the tcp_flags. 1333 */ 1334 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1335 } 1336 } 1337 1338 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1339 { 1340 size_t len; 1341 1342 len = transport->tcp_reclen - transport->tcp_offset; 1343 if (len > desc->count) 1344 len = desc->count; 1345 desc->count -= len; 1346 desc->offset += len; 1347 transport->tcp_offset += len; 1348 dprintk("RPC: discarded %Zu bytes\n", len); 1349 xs_tcp_check_fraghdr(transport); 1350 } 1351 1352 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1353 { 1354 struct rpc_xprt *xprt = rd_desc->arg.data; 1355 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1356 struct xdr_skb_reader desc = { 1357 .skb = skb, 1358 .offset = offset, 1359 .count = len, 1360 }; 1361 1362 dprintk("RPC: xs_tcp_data_recv started\n"); 1363 do { 1364 /* Read in a new fragment marker if necessary */ 1365 /* Can we ever really expect to get completely empty fragments? */ 1366 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1367 xs_tcp_read_fraghdr(xprt, &desc); 1368 continue; 1369 } 1370 /* Read in the xid if necessary */ 1371 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1372 xs_tcp_read_xid(transport, &desc); 1373 continue; 1374 } 1375 /* Read in the call/reply flag */ 1376 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1377 xs_tcp_read_calldir(transport, &desc); 1378 continue; 1379 } 1380 /* Read in the request data */ 1381 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1382 xs_tcp_read_data(xprt, &desc); 1383 continue; 1384 } 1385 /* Skip over any trailing bytes on short reads */ 1386 xs_tcp_read_discard(transport, &desc); 1387 } while (desc.count); 1388 dprintk("RPC: xs_tcp_data_recv done\n"); 1389 return len - desc.count; 1390 } 1391 1392 /** 1393 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1394 * @sk: socket with data to read 1395 * @bytes: how much data to read 1396 * 1397 */ 1398 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1399 { 1400 struct rpc_xprt *xprt; 1401 read_descriptor_t rd_desc; 1402 int read; 1403 1404 dprintk("RPC: xs_tcp_data_ready...\n"); 1405 1406 read_lock_bh(&sk->sk_callback_lock); 1407 if (!(xprt = xprt_from_sock(sk))) 1408 goto out; 1409 /* Any data means we had a useful conversation, so 1410 * the we don't need to delay the next reconnect 1411 */ 1412 if (xprt->reestablish_timeout) 1413 xprt->reestablish_timeout = 0; 1414 1415 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1416 rd_desc.arg.data = xprt; 1417 do { 1418 rd_desc.count = 65536; 1419 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1420 } while (read > 0); 1421 out: 1422 read_unlock_bh(&sk->sk_callback_lock); 1423 } 1424 1425 /* 1426 * Do the equivalent of linger/linger2 handling for dealing with 1427 * broken servers that don't close the socket in a timely 1428 * fashion 1429 */ 1430 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1431 unsigned long timeout) 1432 { 1433 struct sock_xprt *transport; 1434 1435 if (xprt_test_and_set_connecting(xprt)) 1436 return; 1437 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1438 transport = container_of(xprt, struct sock_xprt, xprt); 1439 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1440 timeout); 1441 } 1442 1443 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1444 { 1445 struct sock_xprt *transport; 1446 1447 transport = container_of(xprt, struct sock_xprt, xprt); 1448 1449 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1450 !cancel_delayed_work(&transport->connect_worker)) 1451 return; 1452 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1453 xprt_clear_connecting(xprt); 1454 } 1455 1456 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1457 { 1458 smp_mb__before_clear_bit(); 1459 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1460 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1461 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1462 clear_bit(XPRT_CLOSING, &xprt->state); 1463 smp_mb__after_clear_bit(); 1464 /* Mark transport as closed and wake up all pending tasks */ 1465 xprt_disconnect_done(xprt); 1466 } 1467 1468 /** 1469 * xs_tcp_state_change - callback to handle TCP socket state changes 1470 * @sk: socket whose state has changed 1471 * 1472 */ 1473 static void xs_tcp_state_change(struct sock *sk) 1474 { 1475 struct rpc_xprt *xprt; 1476 1477 read_lock_bh(&sk->sk_callback_lock); 1478 if (!(xprt = xprt_from_sock(sk))) 1479 goto out; 1480 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1481 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1482 sk->sk_state, xprt_connected(xprt), 1483 sock_flag(sk, SOCK_DEAD), 1484 sock_flag(sk, SOCK_ZAPPED), 1485 sk->sk_shutdown); 1486 1487 switch (sk->sk_state) { 1488 case TCP_ESTABLISHED: 1489 spin_lock(&xprt->transport_lock); 1490 if (!xprt_test_and_set_connected(xprt)) { 1491 struct sock_xprt *transport = container_of(xprt, 1492 struct sock_xprt, xprt); 1493 1494 /* Reset TCP record info */ 1495 transport->tcp_offset = 0; 1496 transport->tcp_reclen = 0; 1497 transport->tcp_copied = 0; 1498 transport->tcp_flags = 1499 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1500 1501 xprt_wake_pending_tasks(xprt, -EAGAIN); 1502 } 1503 spin_unlock(&xprt->transport_lock); 1504 break; 1505 case TCP_FIN_WAIT1: 1506 /* The client initiated a shutdown of the socket */ 1507 xprt->connect_cookie++; 1508 xprt->reestablish_timeout = 0; 1509 set_bit(XPRT_CLOSING, &xprt->state); 1510 smp_mb__before_clear_bit(); 1511 clear_bit(XPRT_CONNECTED, &xprt->state); 1512 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1513 smp_mb__after_clear_bit(); 1514 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1515 break; 1516 case TCP_CLOSE_WAIT: 1517 /* The server initiated a shutdown of the socket */ 1518 xprt->connect_cookie++; 1519 xs_tcp_force_close(xprt); 1520 case TCP_CLOSING: 1521 /* 1522 * If the server closed down the connection, make sure that 1523 * we back off before reconnecting 1524 */ 1525 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1526 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1527 break; 1528 case TCP_LAST_ACK: 1529 set_bit(XPRT_CLOSING, &xprt->state); 1530 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1531 smp_mb__before_clear_bit(); 1532 clear_bit(XPRT_CONNECTED, &xprt->state); 1533 smp_mb__after_clear_bit(); 1534 break; 1535 case TCP_CLOSE: 1536 xs_tcp_cancel_linger_timeout(xprt); 1537 xs_sock_mark_closed(xprt); 1538 } 1539 out: 1540 read_unlock_bh(&sk->sk_callback_lock); 1541 } 1542 1543 /** 1544 * xs_error_report - callback mainly for catching socket errors 1545 * @sk: socket 1546 */ 1547 static void xs_error_report(struct sock *sk) 1548 { 1549 struct rpc_xprt *xprt; 1550 1551 read_lock_bh(&sk->sk_callback_lock); 1552 if (!(xprt = xprt_from_sock(sk))) 1553 goto out; 1554 dprintk("RPC: %s client %p...\n" 1555 "RPC: error %d\n", 1556 __func__, xprt, sk->sk_err); 1557 xprt_wake_pending_tasks(xprt, -EAGAIN); 1558 out: 1559 read_unlock_bh(&sk->sk_callback_lock); 1560 } 1561 1562 static void xs_write_space(struct sock *sk) 1563 { 1564 struct socket *sock; 1565 struct rpc_xprt *xprt; 1566 1567 if (unlikely(!(sock = sk->sk_socket))) 1568 return; 1569 clear_bit(SOCK_NOSPACE, &sock->flags); 1570 1571 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1572 return; 1573 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1574 return; 1575 1576 xprt_write_space(xprt); 1577 } 1578 1579 /** 1580 * xs_udp_write_space - callback invoked when socket buffer space 1581 * becomes available 1582 * @sk: socket whose state has changed 1583 * 1584 * Called when more output buffer space is available for this socket. 1585 * We try not to wake our writers until they can make "significant" 1586 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1587 * with a bunch of small requests. 1588 */ 1589 static void xs_udp_write_space(struct sock *sk) 1590 { 1591 read_lock_bh(&sk->sk_callback_lock); 1592 1593 /* from net/core/sock.c:sock_def_write_space */ 1594 if (sock_writeable(sk)) 1595 xs_write_space(sk); 1596 1597 read_unlock_bh(&sk->sk_callback_lock); 1598 } 1599 1600 /** 1601 * xs_tcp_write_space - callback invoked when socket buffer space 1602 * becomes available 1603 * @sk: socket whose state has changed 1604 * 1605 * Called when more output buffer space is available for this socket. 1606 * We try not to wake our writers until they can make "significant" 1607 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1608 * with a bunch of small requests. 1609 */ 1610 static void xs_tcp_write_space(struct sock *sk) 1611 { 1612 read_lock_bh(&sk->sk_callback_lock); 1613 1614 /* from net/core/stream.c:sk_stream_write_space */ 1615 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1616 xs_write_space(sk); 1617 1618 read_unlock_bh(&sk->sk_callback_lock); 1619 } 1620 1621 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1622 { 1623 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1624 struct sock *sk = transport->inet; 1625 1626 if (transport->rcvsize) { 1627 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1628 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1629 } 1630 if (transport->sndsize) { 1631 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1632 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1633 sk->sk_write_space(sk); 1634 } 1635 } 1636 1637 /** 1638 * xs_udp_set_buffer_size - set send and receive limits 1639 * @xprt: generic transport 1640 * @sndsize: requested size of send buffer, in bytes 1641 * @rcvsize: requested size of receive buffer, in bytes 1642 * 1643 * Set socket send and receive buffer size limits. 1644 */ 1645 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1646 { 1647 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1648 1649 transport->sndsize = 0; 1650 if (sndsize) 1651 transport->sndsize = sndsize + 1024; 1652 transport->rcvsize = 0; 1653 if (rcvsize) 1654 transport->rcvsize = rcvsize + 1024; 1655 1656 xs_udp_do_set_buffer_size(xprt); 1657 } 1658 1659 /** 1660 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1661 * @task: task that timed out 1662 * 1663 * Adjust the congestion window after a retransmit timeout has occurred. 1664 */ 1665 static void xs_udp_timer(struct rpc_task *task) 1666 { 1667 xprt_adjust_cwnd(task, -ETIMEDOUT); 1668 } 1669 1670 static unsigned short xs_get_random_port(void) 1671 { 1672 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1673 unsigned short rand = (unsigned short) net_random() % range; 1674 return rand + xprt_min_resvport; 1675 } 1676 1677 /** 1678 * xs_set_port - reset the port number in the remote endpoint address 1679 * @xprt: generic transport 1680 * @port: new port number 1681 * 1682 */ 1683 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1684 { 1685 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1686 1687 rpc_set_port(xs_addr(xprt), port); 1688 xs_update_peer_port(xprt); 1689 } 1690 1691 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1692 { 1693 unsigned short port = transport->srcport; 1694 1695 if (port == 0 && transport->xprt.resvport) 1696 port = xs_get_random_port(); 1697 return port; 1698 } 1699 1700 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1701 { 1702 if (transport->srcport != 0) 1703 transport->srcport = 0; 1704 if (!transport->xprt.resvport) 1705 return 0; 1706 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1707 return xprt_max_resvport; 1708 return --port; 1709 } 1710 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1711 { 1712 struct sockaddr_storage myaddr; 1713 int err, nloop = 0; 1714 unsigned short port = xs_get_srcport(transport); 1715 unsigned short last; 1716 1717 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1718 do { 1719 rpc_set_port((struct sockaddr *)&myaddr, port); 1720 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1721 transport->xprt.addrlen); 1722 if (port == 0) 1723 break; 1724 if (err == 0) { 1725 transport->srcport = port; 1726 break; 1727 } 1728 last = port; 1729 port = xs_next_srcport(transport, port); 1730 if (port > last) 1731 nloop++; 1732 } while (err == -EADDRINUSE && nloop != 2); 1733 1734 if (myaddr.ss_family == AF_INET) 1735 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1736 &((struct sockaddr_in *)&myaddr)->sin_addr, 1737 port, err ? "failed" : "ok", err); 1738 else 1739 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1740 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1741 port, err ? "failed" : "ok", err); 1742 return err; 1743 } 1744 1745 /* 1746 * We don't support autobind on AF_LOCAL sockets 1747 */ 1748 static void xs_local_rpcbind(struct rpc_task *task) 1749 { 1750 xprt_set_bound(task->tk_xprt); 1751 } 1752 1753 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1754 { 1755 } 1756 1757 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1758 static struct lock_class_key xs_key[2]; 1759 static struct lock_class_key xs_slock_key[2]; 1760 1761 static inline void xs_reclassify_socketu(struct socket *sock) 1762 { 1763 struct sock *sk = sock->sk; 1764 1765 BUG_ON(sock_owned_by_user(sk)); 1766 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1767 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1768 } 1769 1770 static inline void xs_reclassify_socket4(struct socket *sock) 1771 { 1772 struct sock *sk = sock->sk; 1773 1774 BUG_ON(sock_owned_by_user(sk)); 1775 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1776 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1777 } 1778 1779 static inline void xs_reclassify_socket6(struct socket *sock) 1780 { 1781 struct sock *sk = sock->sk; 1782 1783 BUG_ON(sock_owned_by_user(sk)); 1784 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1785 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1786 } 1787 1788 static inline void xs_reclassify_socket(int family, struct socket *sock) 1789 { 1790 switch (family) { 1791 case AF_LOCAL: 1792 xs_reclassify_socketu(sock); 1793 break; 1794 case AF_INET: 1795 xs_reclassify_socket4(sock); 1796 break; 1797 case AF_INET6: 1798 xs_reclassify_socket6(sock); 1799 break; 1800 } 1801 } 1802 #else 1803 static inline void xs_reclassify_socketu(struct socket *sock) 1804 { 1805 } 1806 1807 static inline void xs_reclassify_socket4(struct socket *sock) 1808 { 1809 } 1810 1811 static inline void xs_reclassify_socket6(struct socket *sock) 1812 { 1813 } 1814 1815 static inline void xs_reclassify_socket(int family, struct socket *sock) 1816 { 1817 } 1818 #endif 1819 1820 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1821 struct sock_xprt *transport, int family, int type, int protocol) 1822 { 1823 struct socket *sock; 1824 int err; 1825 1826 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1827 if (err < 0) { 1828 dprintk("RPC: can't create %d transport socket (%d).\n", 1829 protocol, -err); 1830 goto out; 1831 } 1832 xs_reclassify_socket(family, sock); 1833 1834 err = xs_bind(transport, sock); 1835 if (err) { 1836 sock_release(sock); 1837 goto out; 1838 } 1839 1840 return sock; 1841 out: 1842 return ERR_PTR(err); 1843 } 1844 1845 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1846 struct socket *sock) 1847 { 1848 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1849 xprt); 1850 1851 if (!transport->inet) { 1852 struct sock *sk = sock->sk; 1853 1854 write_lock_bh(&sk->sk_callback_lock); 1855 1856 xs_save_old_callbacks(transport, sk); 1857 1858 sk->sk_user_data = xprt; 1859 sk->sk_data_ready = xs_local_data_ready; 1860 sk->sk_write_space = xs_udp_write_space; 1861 sk->sk_error_report = xs_error_report; 1862 sk->sk_allocation = GFP_ATOMIC; 1863 1864 xprt_clear_connected(xprt); 1865 1866 /* Reset to new socket */ 1867 transport->sock = sock; 1868 transport->inet = sk; 1869 1870 write_unlock_bh(&sk->sk_callback_lock); 1871 } 1872 1873 /* Tell the socket layer to start connecting... */ 1874 xprt->stat.connect_count++; 1875 xprt->stat.connect_start = jiffies; 1876 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1877 } 1878 1879 /** 1880 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1881 * @xprt: RPC transport to connect 1882 * @transport: socket transport to connect 1883 * @create_sock: function to create a socket of the correct type 1884 * 1885 * Invoked by a work queue tasklet. 1886 */ 1887 static void xs_local_setup_socket(struct work_struct *work) 1888 { 1889 struct sock_xprt *transport = 1890 container_of(work, struct sock_xprt, connect_worker.work); 1891 struct rpc_xprt *xprt = &transport->xprt; 1892 struct socket *sock; 1893 int status = -EIO; 1894 1895 current->flags |= PF_FSTRANS; 1896 1897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1898 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1899 SOCK_STREAM, 0, &sock, 1); 1900 if (status < 0) { 1901 dprintk("RPC: can't create AF_LOCAL " 1902 "transport socket (%d).\n", -status); 1903 goto out; 1904 } 1905 xs_reclassify_socketu(sock); 1906 1907 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1908 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1909 1910 status = xs_local_finish_connecting(xprt, sock); 1911 switch (status) { 1912 case 0: 1913 dprintk("RPC: xprt %p connected to %s\n", 1914 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1915 xprt_set_connected(xprt); 1916 break; 1917 case -ENOENT: 1918 dprintk("RPC: xprt %p: socket %s does not exist\n", 1919 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1920 break; 1921 default: 1922 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1923 __func__, -status, 1924 xprt->address_strings[RPC_DISPLAY_ADDR]); 1925 } 1926 1927 out: 1928 xprt_clear_connecting(xprt); 1929 xprt_wake_pending_tasks(xprt, status); 1930 current->flags &= ~PF_FSTRANS; 1931 } 1932 1933 #ifdef CONFIG_SUNRPC_SWAP 1934 static void xs_set_memalloc(struct rpc_xprt *xprt) 1935 { 1936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1937 xprt); 1938 1939 if (xprt->swapper) 1940 sk_set_memalloc(transport->inet); 1941 } 1942 1943 /** 1944 * xs_swapper - Tag this transport as being used for swap. 1945 * @xprt: transport to tag 1946 * @enable: enable/disable 1947 * 1948 */ 1949 int xs_swapper(struct rpc_xprt *xprt, int enable) 1950 { 1951 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1952 xprt); 1953 int err = 0; 1954 1955 if (enable) { 1956 xprt->swapper++; 1957 xs_set_memalloc(xprt); 1958 } else if (xprt->swapper) { 1959 xprt->swapper--; 1960 sk_clear_memalloc(transport->inet); 1961 } 1962 1963 return err; 1964 } 1965 EXPORT_SYMBOL_GPL(xs_swapper); 1966 #else 1967 static void xs_set_memalloc(struct rpc_xprt *xprt) 1968 { 1969 } 1970 #endif 1971 1972 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1973 { 1974 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1975 1976 if (!transport->inet) { 1977 struct sock *sk = sock->sk; 1978 1979 write_lock_bh(&sk->sk_callback_lock); 1980 1981 xs_save_old_callbacks(transport, sk); 1982 1983 sk->sk_user_data = xprt; 1984 sk->sk_data_ready = xs_udp_data_ready; 1985 sk->sk_write_space = xs_udp_write_space; 1986 sk->sk_error_report = xs_error_report; 1987 sk->sk_no_check = UDP_CSUM_NORCV; 1988 sk->sk_allocation = GFP_ATOMIC; 1989 1990 xprt_set_connected(xprt); 1991 1992 /* Reset to new socket */ 1993 transport->sock = sock; 1994 transport->inet = sk; 1995 1996 xs_set_memalloc(xprt); 1997 1998 write_unlock_bh(&sk->sk_callback_lock); 1999 } 2000 xs_udp_do_set_buffer_size(xprt); 2001 } 2002 2003 static void xs_udp_setup_socket(struct work_struct *work) 2004 { 2005 struct sock_xprt *transport = 2006 container_of(work, struct sock_xprt, connect_worker.work); 2007 struct rpc_xprt *xprt = &transport->xprt; 2008 struct socket *sock = transport->sock; 2009 int status = -EIO; 2010 2011 current->flags |= PF_FSTRANS; 2012 2013 /* Start by resetting any existing state */ 2014 xs_reset_transport(transport); 2015 sock = xs_create_sock(xprt, transport, 2016 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 2017 if (IS_ERR(sock)) 2018 goto out; 2019 2020 dprintk("RPC: worker connecting xprt %p via %s to " 2021 "%s (port %s)\n", xprt, 2022 xprt->address_strings[RPC_DISPLAY_PROTO], 2023 xprt->address_strings[RPC_DISPLAY_ADDR], 2024 xprt->address_strings[RPC_DISPLAY_PORT]); 2025 2026 xs_udp_finish_connecting(xprt, sock); 2027 status = 0; 2028 out: 2029 xprt_clear_connecting(xprt); 2030 xprt_wake_pending_tasks(xprt, status); 2031 current->flags &= ~PF_FSTRANS; 2032 } 2033 2034 /* 2035 * We need to preserve the port number so the reply cache on the server can 2036 * find our cached RPC replies when we get around to reconnecting. 2037 */ 2038 static void xs_abort_connection(struct sock_xprt *transport) 2039 { 2040 int result; 2041 struct sockaddr any; 2042 2043 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2044 2045 /* 2046 * Disconnect the transport socket by doing a connect operation 2047 * with AF_UNSPEC. This should return immediately... 2048 */ 2049 memset(&any, 0, sizeof(any)); 2050 any.sa_family = AF_UNSPEC; 2051 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2052 if (!result) 2053 xs_sock_mark_closed(&transport->xprt); 2054 else 2055 dprintk("RPC: AF_UNSPEC connect return code %d\n", 2056 result); 2057 } 2058 2059 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2060 { 2061 unsigned int state = transport->inet->sk_state; 2062 2063 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2064 /* we don't need to abort the connection if the socket 2065 * hasn't undergone a shutdown 2066 */ 2067 if (transport->inet->sk_shutdown == 0) 2068 return; 2069 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2070 __func__, transport->inet->sk_shutdown); 2071 } 2072 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2073 /* we don't need to abort the connection if the socket 2074 * hasn't undergone a shutdown 2075 */ 2076 if (transport->inet->sk_shutdown == 0) 2077 return; 2078 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2079 "sk_shutdown set to %d\n", 2080 __func__, transport->inet->sk_shutdown); 2081 } 2082 xs_abort_connection(transport); 2083 } 2084 2085 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2086 { 2087 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2088 int ret = -ENOTCONN; 2089 2090 if (!transport->inet) { 2091 struct sock *sk = sock->sk; 2092 2093 write_lock_bh(&sk->sk_callback_lock); 2094 2095 xs_save_old_callbacks(transport, sk); 2096 2097 sk->sk_user_data = xprt; 2098 sk->sk_data_ready = xs_tcp_data_ready; 2099 sk->sk_state_change = xs_tcp_state_change; 2100 sk->sk_write_space = xs_tcp_write_space; 2101 sk->sk_error_report = xs_error_report; 2102 sk->sk_allocation = GFP_ATOMIC; 2103 2104 /* socket options */ 2105 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2106 sock_reset_flag(sk, SOCK_LINGER); 2107 tcp_sk(sk)->linger2 = 0; 2108 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2109 2110 xprt_clear_connected(xprt); 2111 2112 /* Reset to new socket */ 2113 transport->sock = sock; 2114 transport->inet = sk; 2115 2116 write_unlock_bh(&sk->sk_callback_lock); 2117 } 2118 2119 if (!xprt_bound(xprt)) 2120 goto out; 2121 2122 xs_set_memalloc(xprt); 2123 2124 /* Tell the socket layer to start connecting... */ 2125 xprt->stat.connect_count++; 2126 xprt->stat.connect_start = jiffies; 2127 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2128 switch (ret) { 2129 case 0: 2130 case -EINPROGRESS: 2131 /* SYN_SENT! */ 2132 xprt->connect_cookie++; 2133 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2134 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2135 } 2136 out: 2137 return ret; 2138 } 2139 2140 /** 2141 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2142 * @xprt: RPC transport to connect 2143 * @transport: socket transport to connect 2144 * @create_sock: function to create a socket of the correct type 2145 * 2146 * Invoked by a work queue tasklet. 2147 */ 2148 static void xs_tcp_setup_socket(struct work_struct *work) 2149 { 2150 struct sock_xprt *transport = 2151 container_of(work, struct sock_xprt, connect_worker.work); 2152 struct socket *sock = transport->sock; 2153 struct rpc_xprt *xprt = &transport->xprt; 2154 int status = -EIO; 2155 2156 current->flags |= PF_FSTRANS; 2157 2158 if (!sock) { 2159 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2160 sock = xs_create_sock(xprt, transport, 2161 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2162 if (IS_ERR(sock)) { 2163 status = PTR_ERR(sock); 2164 goto out; 2165 } 2166 } else { 2167 int abort_and_exit; 2168 2169 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2170 &xprt->state); 2171 /* "close" the socket, preserving the local port */ 2172 xs_tcp_reuse_connection(transport); 2173 2174 if (abort_and_exit) 2175 goto out_eagain; 2176 } 2177 2178 dprintk("RPC: worker connecting xprt %p via %s to " 2179 "%s (port %s)\n", xprt, 2180 xprt->address_strings[RPC_DISPLAY_PROTO], 2181 xprt->address_strings[RPC_DISPLAY_ADDR], 2182 xprt->address_strings[RPC_DISPLAY_PORT]); 2183 2184 status = xs_tcp_finish_connecting(xprt, sock); 2185 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2186 xprt, -status, xprt_connected(xprt), 2187 sock->sk->sk_state); 2188 switch (status) { 2189 default: 2190 printk("%s: connect returned unhandled error %d\n", 2191 __func__, status); 2192 case -EADDRNOTAVAIL: 2193 /* We're probably in TIME_WAIT. Get rid of existing socket, 2194 * and retry 2195 */ 2196 xs_tcp_force_close(xprt); 2197 break; 2198 case -ECONNREFUSED: 2199 case -ECONNRESET: 2200 case -ENETUNREACH: 2201 /* retry with existing socket, after a delay */ 2202 case 0: 2203 case -EINPROGRESS: 2204 case -EALREADY: 2205 xprt_clear_connecting(xprt); 2206 current->flags &= ~PF_FSTRANS; 2207 return; 2208 case -EINVAL: 2209 /* Happens, for instance, if the user specified a link 2210 * local IPv6 address without a scope-id. 2211 */ 2212 goto out; 2213 } 2214 out_eagain: 2215 status = -EAGAIN; 2216 out: 2217 xprt_clear_connecting(xprt); 2218 xprt_wake_pending_tasks(xprt, status); 2219 current->flags &= ~PF_FSTRANS; 2220 } 2221 2222 /** 2223 * xs_connect - connect a socket to a remote endpoint 2224 * @task: address of RPC task that manages state of connect request 2225 * 2226 * TCP: If the remote end dropped the connection, delay reconnecting. 2227 * 2228 * UDP socket connects are synchronous, but we use a work queue anyway 2229 * to guarantee that even unprivileged user processes can set up a 2230 * socket on a privileged port. 2231 * 2232 * If a UDP socket connect fails, the delay behavior here prevents 2233 * retry floods (hard mounts). 2234 */ 2235 static void xs_connect(struct rpc_task *task) 2236 { 2237 struct rpc_xprt *xprt = task->tk_xprt; 2238 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2239 2240 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2241 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2242 "seconds\n", 2243 xprt, xprt->reestablish_timeout / HZ); 2244 queue_delayed_work(rpciod_workqueue, 2245 &transport->connect_worker, 2246 xprt->reestablish_timeout); 2247 xprt->reestablish_timeout <<= 1; 2248 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2249 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2250 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2251 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2252 } else { 2253 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2254 queue_delayed_work(rpciod_workqueue, 2255 &transport->connect_worker, 0); 2256 } 2257 } 2258 2259 /** 2260 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2261 * @xprt: rpc_xprt struct containing statistics 2262 * @seq: output file 2263 * 2264 */ 2265 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2266 { 2267 long idle_time = 0; 2268 2269 if (xprt_connected(xprt)) 2270 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2271 2272 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2273 "%llu %llu %lu %llu %llu\n", 2274 xprt->stat.bind_count, 2275 xprt->stat.connect_count, 2276 xprt->stat.connect_time, 2277 idle_time, 2278 xprt->stat.sends, 2279 xprt->stat.recvs, 2280 xprt->stat.bad_xids, 2281 xprt->stat.req_u, 2282 xprt->stat.bklog_u, 2283 xprt->stat.max_slots, 2284 xprt->stat.sending_u, 2285 xprt->stat.pending_u); 2286 } 2287 2288 /** 2289 * xs_udp_print_stats - display UDP socket-specifc stats 2290 * @xprt: rpc_xprt struct containing statistics 2291 * @seq: output file 2292 * 2293 */ 2294 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2295 { 2296 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2297 2298 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2299 "%lu %llu %llu\n", 2300 transport->srcport, 2301 xprt->stat.bind_count, 2302 xprt->stat.sends, 2303 xprt->stat.recvs, 2304 xprt->stat.bad_xids, 2305 xprt->stat.req_u, 2306 xprt->stat.bklog_u, 2307 xprt->stat.max_slots, 2308 xprt->stat.sending_u, 2309 xprt->stat.pending_u); 2310 } 2311 2312 /** 2313 * xs_tcp_print_stats - display TCP socket-specifc stats 2314 * @xprt: rpc_xprt struct containing statistics 2315 * @seq: output file 2316 * 2317 */ 2318 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2319 { 2320 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2321 long idle_time = 0; 2322 2323 if (xprt_connected(xprt)) 2324 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2325 2326 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2327 "%llu %llu %lu %llu %llu\n", 2328 transport->srcport, 2329 xprt->stat.bind_count, 2330 xprt->stat.connect_count, 2331 xprt->stat.connect_time, 2332 idle_time, 2333 xprt->stat.sends, 2334 xprt->stat.recvs, 2335 xprt->stat.bad_xids, 2336 xprt->stat.req_u, 2337 xprt->stat.bklog_u, 2338 xprt->stat.max_slots, 2339 xprt->stat.sending_u, 2340 xprt->stat.pending_u); 2341 } 2342 2343 /* 2344 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2345 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2346 * to use the server side send routines. 2347 */ 2348 static void *bc_malloc(struct rpc_task *task, size_t size) 2349 { 2350 struct page *page; 2351 struct rpc_buffer *buf; 2352 2353 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2354 page = alloc_page(GFP_KERNEL); 2355 2356 if (!page) 2357 return NULL; 2358 2359 buf = page_address(page); 2360 buf->len = PAGE_SIZE; 2361 2362 return buf->data; 2363 } 2364 2365 /* 2366 * Free the space allocated in the bc_alloc routine 2367 */ 2368 static void bc_free(void *buffer) 2369 { 2370 struct rpc_buffer *buf; 2371 2372 if (!buffer) 2373 return; 2374 2375 buf = container_of(buffer, struct rpc_buffer, data); 2376 free_page((unsigned long)buf); 2377 } 2378 2379 /* 2380 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2381 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2382 */ 2383 static int bc_sendto(struct rpc_rqst *req) 2384 { 2385 int len; 2386 struct xdr_buf *xbufp = &req->rq_snd_buf; 2387 struct rpc_xprt *xprt = req->rq_xprt; 2388 struct sock_xprt *transport = 2389 container_of(xprt, struct sock_xprt, xprt); 2390 struct socket *sock = transport->sock; 2391 unsigned long headoff; 2392 unsigned long tailoff; 2393 2394 xs_encode_stream_record_marker(xbufp); 2395 2396 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2397 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2398 len = svc_send_common(sock, xbufp, 2399 virt_to_page(xbufp->head[0].iov_base), headoff, 2400 xbufp->tail[0].iov_base, tailoff); 2401 2402 if (len != xbufp->len) { 2403 printk(KERN_NOTICE "Error sending entire callback!\n"); 2404 len = -EAGAIN; 2405 } 2406 2407 return len; 2408 } 2409 2410 /* 2411 * The send routine. Borrows from svc_send 2412 */ 2413 static int bc_send_request(struct rpc_task *task) 2414 { 2415 struct rpc_rqst *req = task->tk_rqstp; 2416 struct svc_xprt *xprt; 2417 struct svc_sock *svsk; 2418 u32 len; 2419 2420 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2421 /* 2422 * Get the server socket associated with this callback xprt 2423 */ 2424 xprt = req->rq_xprt->bc_xprt; 2425 svsk = container_of(xprt, struct svc_sock, sk_xprt); 2426 2427 /* 2428 * Grab the mutex to serialize data as the connection is shared 2429 * with the fore channel 2430 */ 2431 if (!mutex_trylock(&xprt->xpt_mutex)) { 2432 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2433 if (!mutex_trylock(&xprt->xpt_mutex)) 2434 return -EAGAIN; 2435 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2436 } 2437 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2438 len = -ENOTCONN; 2439 else 2440 len = bc_sendto(req); 2441 mutex_unlock(&xprt->xpt_mutex); 2442 2443 if (len > 0) 2444 len = 0; 2445 2446 return len; 2447 } 2448 2449 /* 2450 * The close routine. Since this is client initiated, we do nothing 2451 */ 2452 2453 static void bc_close(struct rpc_xprt *xprt) 2454 { 2455 } 2456 2457 /* 2458 * The xprt destroy routine. Again, because this connection is client 2459 * initiated, we do nothing 2460 */ 2461 2462 static void bc_destroy(struct rpc_xprt *xprt) 2463 { 2464 } 2465 2466 static struct rpc_xprt_ops xs_local_ops = { 2467 .reserve_xprt = xprt_reserve_xprt, 2468 .release_xprt = xs_tcp_release_xprt, 2469 .alloc_slot = xprt_alloc_slot, 2470 .rpcbind = xs_local_rpcbind, 2471 .set_port = xs_local_set_port, 2472 .connect = xs_connect, 2473 .buf_alloc = rpc_malloc, 2474 .buf_free = rpc_free, 2475 .send_request = xs_local_send_request, 2476 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2477 .close = xs_close, 2478 .destroy = xs_destroy, 2479 .print_stats = xs_local_print_stats, 2480 }; 2481 2482 static struct rpc_xprt_ops xs_udp_ops = { 2483 .set_buffer_size = xs_udp_set_buffer_size, 2484 .reserve_xprt = xprt_reserve_xprt_cong, 2485 .release_xprt = xprt_release_xprt_cong, 2486 .alloc_slot = xprt_alloc_slot, 2487 .rpcbind = rpcb_getport_async, 2488 .set_port = xs_set_port, 2489 .connect = xs_connect, 2490 .buf_alloc = rpc_malloc, 2491 .buf_free = rpc_free, 2492 .send_request = xs_udp_send_request, 2493 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2494 .timer = xs_udp_timer, 2495 .release_request = xprt_release_rqst_cong, 2496 .close = xs_close, 2497 .destroy = xs_destroy, 2498 .print_stats = xs_udp_print_stats, 2499 }; 2500 2501 static struct rpc_xprt_ops xs_tcp_ops = { 2502 .reserve_xprt = xprt_reserve_xprt, 2503 .release_xprt = xs_tcp_release_xprt, 2504 .alloc_slot = xprt_lock_and_alloc_slot, 2505 .rpcbind = rpcb_getport_async, 2506 .set_port = xs_set_port, 2507 .connect = xs_connect, 2508 .buf_alloc = rpc_malloc, 2509 .buf_free = rpc_free, 2510 .send_request = xs_tcp_send_request, 2511 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2512 .close = xs_tcp_close, 2513 .destroy = xs_destroy, 2514 .print_stats = xs_tcp_print_stats, 2515 }; 2516 2517 /* 2518 * The rpc_xprt_ops for the server backchannel 2519 */ 2520 2521 static struct rpc_xprt_ops bc_tcp_ops = { 2522 .reserve_xprt = xprt_reserve_xprt, 2523 .release_xprt = xprt_release_xprt, 2524 .alloc_slot = xprt_alloc_slot, 2525 .rpcbind = xs_local_rpcbind, 2526 .buf_alloc = bc_malloc, 2527 .buf_free = bc_free, 2528 .send_request = bc_send_request, 2529 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2530 .close = bc_close, 2531 .destroy = bc_destroy, 2532 .print_stats = xs_tcp_print_stats, 2533 }; 2534 2535 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2536 { 2537 static const struct sockaddr_in sin = { 2538 .sin_family = AF_INET, 2539 .sin_addr.s_addr = htonl(INADDR_ANY), 2540 }; 2541 static const struct sockaddr_in6 sin6 = { 2542 .sin6_family = AF_INET6, 2543 .sin6_addr = IN6ADDR_ANY_INIT, 2544 }; 2545 2546 switch (family) { 2547 case AF_LOCAL: 2548 break; 2549 case AF_INET: 2550 memcpy(sap, &sin, sizeof(sin)); 2551 break; 2552 case AF_INET6: 2553 memcpy(sap, &sin6, sizeof(sin6)); 2554 break; 2555 default: 2556 dprintk("RPC: %s: Bad address family\n", __func__); 2557 return -EAFNOSUPPORT; 2558 } 2559 return 0; 2560 } 2561 2562 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2563 unsigned int slot_table_size, 2564 unsigned int max_slot_table_size) 2565 { 2566 struct rpc_xprt *xprt; 2567 struct sock_xprt *new; 2568 2569 if (args->addrlen > sizeof(xprt->addr)) { 2570 dprintk("RPC: xs_setup_xprt: address too large\n"); 2571 return ERR_PTR(-EBADF); 2572 } 2573 2574 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2575 max_slot_table_size); 2576 if (xprt == NULL) { 2577 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2578 "rpc_xprt\n"); 2579 return ERR_PTR(-ENOMEM); 2580 } 2581 2582 new = container_of(xprt, struct sock_xprt, xprt); 2583 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2584 xprt->addrlen = args->addrlen; 2585 if (args->srcaddr) 2586 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2587 else { 2588 int err; 2589 err = xs_init_anyaddr(args->dstaddr->sa_family, 2590 (struct sockaddr *)&new->srcaddr); 2591 if (err != 0) { 2592 xprt_free(xprt); 2593 return ERR_PTR(err); 2594 } 2595 } 2596 2597 return xprt; 2598 } 2599 2600 static const struct rpc_timeout xs_local_default_timeout = { 2601 .to_initval = 10 * HZ, 2602 .to_maxval = 10 * HZ, 2603 .to_retries = 2, 2604 }; 2605 2606 /** 2607 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2608 * @args: rpc transport creation arguments 2609 * 2610 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2611 */ 2612 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2613 { 2614 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2615 struct sock_xprt *transport; 2616 struct rpc_xprt *xprt; 2617 struct rpc_xprt *ret; 2618 2619 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2620 xprt_max_tcp_slot_table_entries); 2621 if (IS_ERR(xprt)) 2622 return xprt; 2623 transport = container_of(xprt, struct sock_xprt, xprt); 2624 2625 xprt->prot = 0; 2626 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2627 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2628 2629 xprt->bind_timeout = XS_BIND_TO; 2630 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2631 xprt->idle_timeout = XS_IDLE_DISC_TO; 2632 2633 xprt->ops = &xs_local_ops; 2634 xprt->timeout = &xs_local_default_timeout; 2635 2636 switch (sun->sun_family) { 2637 case AF_LOCAL: 2638 if (sun->sun_path[0] != '/') { 2639 dprintk("RPC: bad AF_LOCAL address: %s\n", 2640 sun->sun_path); 2641 ret = ERR_PTR(-EINVAL); 2642 goto out_err; 2643 } 2644 xprt_set_bound(xprt); 2645 INIT_DELAYED_WORK(&transport->connect_worker, 2646 xs_local_setup_socket); 2647 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2648 break; 2649 default: 2650 ret = ERR_PTR(-EAFNOSUPPORT); 2651 goto out_err; 2652 } 2653 2654 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2655 xprt->address_strings[RPC_DISPLAY_ADDR]); 2656 2657 if (try_module_get(THIS_MODULE)) 2658 return xprt; 2659 ret = ERR_PTR(-EINVAL); 2660 out_err: 2661 xprt_free(xprt); 2662 return ret; 2663 } 2664 2665 static const struct rpc_timeout xs_udp_default_timeout = { 2666 .to_initval = 5 * HZ, 2667 .to_maxval = 30 * HZ, 2668 .to_increment = 5 * HZ, 2669 .to_retries = 5, 2670 }; 2671 2672 /** 2673 * xs_setup_udp - Set up transport to use a UDP socket 2674 * @args: rpc transport creation arguments 2675 * 2676 */ 2677 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2678 { 2679 struct sockaddr *addr = args->dstaddr; 2680 struct rpc_xprt *xprt; 2681 struct sock_xprt *transport; 2682 struct rpc_xprt *ret; 2683 2684 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2685 xprt_udp_slot_table_entries); 2686 if (IS_ERR(xprt)) 2687 return xprt; 2688 transport = container_of(xprt, struct sock_xprt, xprt); 2689 2690 xprt->prot = IPPROTO_UDP; 2691 xprt->tsh_size = 0; 2692 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2693 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2694 2695 xprt->bind_timeout = XS_BIND_TO; 2696 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2697 xprt->idle_timeout = XS_IDLE_DISC_TO; 2698 2699 xprt->ops = &xs_udp_ops; 2700 2701 xprt->timeout = &xs_udp_default_timeout; 2702 2703 switch (addr->sa_family) { 2704 case AF_INET: 2705 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2706 xprt_set_bound(xprt); 2707 2708 INIT_DELAYED_WORK(&transport->connect_worker, 2709 xs_udp_setup_socket); 2710 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2711 break; 2712 case AF_INET6: 2713 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2714 xprt_set_bound(xprt); 2715 2716 INIT_DELAYED_WORK(&transport->connect_worker, 2717 xs_udp_setup_socket); 2718 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2719 break; 2720 default: 2721 ret = ERR_PTR(-EAFNOSUPPORT); 2722 goto out_err; 2723 } 2724 2725 if (xprt_bound(xprt)) 2726 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2727 xprt->address_strings[RPC_DISPLAY_ADDR], 2728 xprt->address_strings[RPC_DISPLAY_PORT], 2729 xprt->address_strings[RPC_DISPLAY_PROTO]); 2730 else 2731 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2732 xprt->address_strings[RPC_DISPLAY_ADDR], 2733 xprt->address_strings[RPC_DISPLAY_PROTO]); 2734 2735 if (try_module_get(THIS_MODULE)) 2736 return xprt; 2737 ret = ERR_PTR(-EINVAL); 2738 out_err: 2739 xprt_free(xprt); 2740 return ret; 2741 } 2742 2743 static const struct rpc_timeout xs_tcp_default_timeout = { 2744 .to_initval = 60 * HZ, 2745 .to_maxval = 60 * HZ, 2746 .to_retries = 2, 2747 }; 2748 2749 /** 2750 * xs_setup_tcp - Set up transport to use a TCP socket 2751 * @args: rpc transport creation arguments 2752 * 2753 */ 2754 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2755 { 2756 struct sockaddr *addr = args->dstaddr; 2757 struct rpc_xprt *xprt; 2758 struct sock_xprt *transport; 2759 struct rpc_xprt *ret; 2760 2761 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2762 xprt_max_tcp_slot_table_entries); 2763 if (IS_ERR(xprt)) 2764 return xprt; 2765 transport = container_of(xprt, struct sock_xprt, xprt); 2766 2767 xprt->prot = IPPROTO_TCP; 2768 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2769 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2770 2771 xprt->bind_timeout = XS_BIND_TO; 2772 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2773 xprt->idle_timeout = XS_IDLE_DISC_TO; 2774 2775 xprt->ops = &xs_tcp_ops; 2776 xprt->timeout = &xs_tcp_default_timeout; 2777 2778 switch (addr->sa_family) { 2779 case AF_INET: 2780 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2781 xprt_set_bound(xprt); 2782 2783 INIT_DELAYED_WORK(&transport->connect_worker, 2784 xs_tcp_setup_socket); 2785 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2786 break; 2787 case AF_INET6: 2788 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2789 xprt_set_bound(xprt); 2790 2791 INIT_DELAYED_WORK(&transport->connect_worker, 2792 xs_tcp_setup_socket); 2793 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2794 break; 2795 default: 2796 ret = ERR_PTR(-EAFNOSUPPORT); 2797 goto out_err; 2798 } 2799 2800 if (xprt_bound(xprt)) 2801 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2802 xprt->address_strings[RPC_DISPLAY_ADDR], 2803 xprt->address_strings[RPC_DISPLAY_PORT], 2804 xprt->address_strings[RPC_DISPLAY_PROTO]); 2805 else 2806 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2807 xprt->address_strings[RPC_DISPLAY_ADDR], 2808 xprt->address_strings[RPC_DISPLAY_PROTO]); 2809 2810 2811 if (try_module_get(THIS_MODULE)) 2812 return xprt; 2813 ret = ERR_PTR(-EINVAL); 2814 out_err: 2815 xprt_free(xprt); 2816 return ret; 2817 } 2818 2819 /** 2820 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2821 * @args: rpc transport creation arguments 2822 * 2823 */ 2824 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2825 { 2826 struct sockaddr *addr = args->dstaddr; 2827 struct rpc_xprt *xprt; 2828 struct sock_xprt *transport; 2829 struct svc_sock *bc_sock; 2830 struct rpc_xprt *ret; 2831 2832 if (args->bc_xprt->xpt_bc_xprt) { 2833 /* 2834 * This server connection already has a backchannel 2835 * export; we can't create a new one, as we wouldn't be 2836 * able to match replies based on xid any more. So, 2837 * reuse the already-existing one: 2838 */ 2839 return args->bc_xprt->xpt_bc_xprt; 2840 } 2841 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2842 xprt_tcp_slot_table_entries); 2843 if (IS_ERR(xprt)) 2844 return xprt; 2845 transport = container_of(xprt, struct sock_xprt, xprt); 2846 2847 xprt->prot = IPPROTO_TCP; 2848 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2849 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2850 xprt->timeout = &xs_tcp_default_timeout; 2851 2852 /* backchannel */ 2853 xprt_set_bound(xprt); 2854 xprt->bind_timeout = 0; 2855 xprt->reestablish_timeout = 0; 2856 xprt->idle_timeout = 0; 2857 2858 xprt->ops = &bc_tcp_ops; 2859 2860 switch (addr->sa_family) { 2861 case AF_INET: 2862 xs_format_peer_addresses(xprt, "tcp", 2863 RPCBIND_NETID_TCP); 2864 break; 2865 case AF_INET6: 2866 xs_format_peer_addresses(xprt, "tcp", 2867 RPCBIND_NETID_TCP6); 2868 break; 2869 default: 2870 ret = ERR_PTR(-EAFNOSUPPORT); 2871 goto out_err; 2872 } 2873 2874 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2875 xprt->address_strings[RPC_DISPLAY_ADDR], 2876 xprt->address_strings[RPC_DISPLAY_PORT], 2877 xprt->address_strings[RPC_DISPLAY_PROTO]); 2878 2879 /* 2880 * Once we've associated a backchannel xprt with a connection, 2881 * we want to keep it around as long as long as the connection 2882 * lasts, in case we need to start using it for a backchannel 2883 * again; this reference won't be dropped until bc_xprt is 2884 * destroyed. 2885 */ 2886 xprt_get(xprt); 2887 args->bc_xprt->xpt_bc_xprt = xprt; 2888 xprt->bc_xprt = args->bc_xprt; 2889 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2890 transport->sock = bc_sock->sk_sock; 2891 transport->inet = bc_sock->sk_sk; 2892 2893 /* 2894 * Since we don't want connections for the backchannel, we set 2895 * the xprt status to connected 2896 */ 2897 xprt_set_connected(xprt); 2898 2899 2900 if (try_module_get(THIS_MODULE)) 2901 return xprt; 2902 xprt_put(xprt); 2903 ret = ERR_PTR(-EINVAL); 2904 out_err: 2905 xprt_free(xprt); 2906 return ret; 2907 } 2908 2909 static struct xprt_class xs_local_transport = { 2910 .list = LIST_HEAD_INIT(xs_local_transport.list), 2911 .name = "named UNIX socket", 2912 .owner = THIS_MODULE, 2913 .ident = XPRT_TRANSPORT_LOCAL, 2914 .setup = xs_setup_local, 2915 }; 2916 2917 static struct xprt_class xs_udp_transport = { 2918 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2919 .name = "udp", 2920 .owner = THIS_MODULE, 2921 .ident = XPRT_TRANSPORT_UDP, 2922 .setup = xs_setup_udp, 2923 }; 2924 2925 static struct xprt_class xs_tcp_transport = { 2926 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2927 .name = "tcp", 2928 .owner = THIS_MODULE, 2929 .ident = XPRT_TRANSPORT_TCP, 2930 .setup = xs_setup_tcp, 2931 }; 2932 2933 static struct xprt_class xs_bc_tcp_transport = { 2934 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2935 .name = "tcp NFSv4.1 backchannel", 2936 .owner = THIS_MODULE, 2937 .ident = XPRT_TRANSPORT_BC_TCP, 2938 .setup = xs_setup_bc_tcp, 2939 }; 2940 2941 /** 2942 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2943 * 2944 */ 2945 int init_socket_xprt(void) 2946 { 2947 #ifdef RPC_DEBUG 2948 if (!sunrpc_table_header) 2949 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2950 #endif 2951 2952 xprt_register_transport(&xs_local_transport); 2953 xprt_register_transport(&xs_udp_transport); 2954 xprt_register_transport(&xs_tcp_transport); 2955 xprt_register_transport(&xs_bc_tcp_transport); 2956 2957 return 0; 2958 } 2959 2960 /** 2961 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2962 * 2963 */ 2964 void cleanup_socket_xprt(void) 2965 { 2966 #ifdef RPC_DEBUG 2967 if (sunrpc_table_header) { 2968 unregister_sysctl_table(sunrpc_table_header); 2969 sunrpc_table_header = NULL; 2970 } 2971 #endif 2972 2973 xprt_unregister_transport(&xs_local_transport); 2974 xprt_unregister_transport(&xs_udp_transport); 2975 xprt_unregister_transport(&xs_tcp_transport); 2976 xprt_unregister_transport(&xs_bc_tcp_transport); 2977 } 2978 2979 static int param_set_uint_minmax(const char *val, 2980 const struct kernel_param *kp, 2981 unsigned int min, unsigned int max) 2982 { 2983 unsigned long num; 2984 int ret; 2985 2986 if (!val) 2987 return -EINVAL; 2988 ret = strict_strtoul(val, 0, &num); 2989 if (ret == -EINVAL || num < min || num > max) 2990 return -EINVAL; 2991 *((unsigned int *)kp->arg) = num; 2992 return 0; 2993 } 2994 2995 static int param_set_portnr(const char *val, const struct kernel_param *kp) 2996 { 2997 return param_set_uint_minmax(val, kp, 2998 RPC_MIN_RESVPORT, 2999 RPC_MAX_RESVPORT); 3000 } 3001 3002 static struct kernel_param_ops param_ops_portnr = { 3003 .set = param_set_portnr, 3004 .get = param_get_uint, 3005 }; 3006 3007 #define param_check_portnr(name, p) \ 3008 __param_check(name, p, unsigned int); 3009 3010 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3011 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3012 3013 static int param_set_slot_table_size(const char *val, 3014 const struct kernel_param *kp) 3015 { 3016 return param_set_uint_minmax(val, kp, 3017 RPC_MIN_SLOT_TABLE, 3018 RPC_MAX_SLOT_TABLE); 3019 } 3020 3021 static struct kernel_param_ops param_ops_slot_table_size = { 3022 .set = param_set_slot_table_size, 3023 .get = param_get_uint, 3024 }; 3025 3026 #define param_check_slot_table_size(name, p) \ 3027 __param_check(name, p, unsigned int); 3028 3029 static int param_set_max_slot_table_size(const char *val, 3030 const struct kernel_param *kp) 3031 { 3032 return param_set_uint_minmax(val, kp, 3033 RPC_MIN_SLOT_TABLE, 3034 RPC_MAX_SLOT_TABLE_LIMIT); 3035 } 3036 3037 static struct kernel_param_ops param_ops_max_slot_table_size = { 3038 .set = param_set_max_slot_table_size, 3039 .get = param_get_uint, 3040 }; 3041 3042 #define param_check_max_slot_table_size(name, p) \ 3043 __param_check(name, p, unsigned int); 3044 3045 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3046 slot_table_size, 0644); 3047 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3048 max_slot_table_size, 0644); 3049 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3050 slot_table_size, 0644); 3051 3052