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 void (*old_error_report)(struct sock *); 261 }; 262 263 /* 264 * TCP receive state flags 265 */ 266 #define TCP_RCV_LAST_FRAG (1UL << 0) 267 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 268 #define TCP_RCV_COPY_XID (1UL << 2) 269 #define TCP_RCV_COPY_DATA (1UL << 3) 270 #define TCP_RCV_READ_CALLDIR (1UL << 4) 271 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 272 273 /* 274 * TCP RPC flags 275 */ 276 #define TCP_RPC_REPLY (1UL << 6) 277 278 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 279 { 280 return (struct rpc_xprt *) sk->sk_user_data; 281 } 282 283 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 284 { 285 return (struct sockaddr *) &xprt->addr; 286 } 287 288 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 289 { 290 return (struct sockaddr_un *) &xprt->addr; 291 } 292 293 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 294 { 295 return (struct sockaddr_in *) &xprt->addr; 296 } 297 298 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 299 { 300 return (struct sockaddr_in6 *) &xprt->addr; 301 } 302 303 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 304 { 305 struct sockaddr *sap = xs_addr(xprt); 306 struct sockaddr_in6 *sin6; 307 struct sockaddr_in *sin; 308 struct sockaddr_un *sun; 309 char buf[128]; 310 311 switch (sap->sa_family) { 312 case AF_LOCAL: 313 sun = xs_addr_un(xprt); 314 strlcpy(buf, sun->sun_path, sizeof(buf)); 315 xprt->address_strings[RPC_DISPLAY_ADDR] = 316 kstrdup(buf, GFP_KERNEL); 317 break; 318 case AF_INET: 319 (void)rpc_ntop(sap, buf, sizeof(buf)); 320 xprt->address_strings[RPC_DISPLAY_ADDR] = 321 kstrdup(buf, GFP_KERNEL); 322 sin = xs_addr_in(xprt); 323 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 324 break; 325 case AF_INET6: 326 (void)rpc_ntop(sap, buf, sizeof(buf)); 327 xprt->address_strings[RPC_DISPLAY_ADDR] = 328 kstrdup(buf, GFP_KERNEL); 329 sin6 = xs_addr_in6(xprt); 330 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 331 break; 332 default: 333 BUG(); 334 } 335 336 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 337 } 338 339 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 340 { 341 struct sockaddr *sap = xs_addr(xprt); 342 char buf[128]; 343 344 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 345 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 346 347 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 348 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 349 } 350 351 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 352 const char *protocol, 353 const char *netid) 354 { 355 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 356 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 357 xs_format_common_peer_addresses(xprt); 358 xs_format_common_peer_ports(xprt); 359 } 360 361 static void xs_update_peer_port(struct rpc_xprt *xprt) 362 { 363 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 364 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 365 366 xs_format_common_peer_ports(xprt); 367 } 368 369 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 370 { 371 unsigned int i; 372 373 for (i = 0; i < RPC_DISPLAY_MAX; i++) 374 switch (i) { 375 case RPC_DISPLAY_PROTO: 376 case RPC_DISPLAY_NETID: 377 continue; 378 default: 379 kfree(xprt->address_strings[i]); 380 } 381 } 382 383 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 384 385 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 386 { 387 struct msghdr msg = { 388 .msg_name = addr, 389 .msg_namelen = addrlen, 390 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 391 }; 392 struct kvec iov = { 393 .iov_base = vec->iov_base + base, 394 .iov_len = vec->iov_len - base, 395 }; 396 397 if (iov.iov_len != 0) 398 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 399 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 400 } 401 402 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy) 403 { 404 ssize_t (*do_sendpage)(struct socket *sock, struct page *page, 405 int offset, size_t size, int flags); 406 struct page **ppage; 407 unsigned int remainder; 408 int err, sent = 0; 409 410 remainder = xdr->page_len - base; 411 base += xdr->page_base; 412 ppage = xdr->pages + (base >> PAGE_SHIFT); 413 base &= ~PAGE_MASK; 414 do_sendpage = sock->ops->sendpage; 415 if (!zerocopy) 416 do_sendpage = sock_no_sendpage; 417 for(;;) { 418 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 419 int flags = XS_SENDMSG_FLAGS; 420 421 remainder -= len; 422 if (remainder != 0 || more) 423 flags |= MSG_MORE; 424 err = do_sendpage(sock, *ppage, base, len, flags); 425 if (remainder == 0 || err != len) 426 break; 427 sent += err; 428 ppage++; 429 base = 0; 430 } 431 if (sent == 0) 432 return err; 433 if (err > 0) 434 sent += err; 435 return sent; 436 } 437 438 /** 439 * xs_sendpages - write pages directly to a socket 440 * @sock: socket to send on 441 * @addr: UDP only -- address of destination 442 * @addrlen: UDP only -- length of destination address 443 * @xdr: buffer containing this request 444 * @base: starting position in the buffer 445 * @zerocopy: true if it is safe to use sendpage() 446 * 447 */ 448 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy) 449 { 450 unsigned int remainder = xdr->len - base; 451 int err, sent = 0; 452 453 if (unlikely(!sock)) 454 return -ENOTSOCK; 455 456 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 457 if (base != 0) { 458 addr = NULL; 459 addrlen = 0; 460 } 461 462 if (base < xdr->head[0].iov_len || addr != NULL) { 463 unsigned int len = xdr->head[0].iov_len - base; 464 remainder -= len; 465 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 466 if (remainder == 0 || err != len) 467 goto out; 468 sent += err; 469 base = 0; 470 } else 471 base -= xdr->head[0].iov_len; 472 473 if (base < xdr->page_len) { 474 unsigned int len = xdr->page_len - base; 475 remainder -= len; 476 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy); 477 if (remainder == 0 || err != len) 478 goto out; 479 sent += err; 480 base = 0; 481 } else 482 base -= xdr->page_len; 483 484 if (base >= xdr->tail[0].iov_len) 485 return sent; 486 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 487 out: 488 if (sent == 0) 489 return err; 490 if (err > 0) 491 sent += err; 492 return sent; 493 } 494 495 static void xs_nospace_callback(struct rpc_task *task) 496 { 497 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 498 499 transport->inet->sk_write_pending--; 500 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 501 } 502 503 /** 504 * xs_nospace - place task on wait queue if transmit was incomplete 505 * @task: task to put to sleep 506 * 507 */ 508 static int xs_nospace(struct rpc_task *task) 509 { 510 struct rpc_rqst *req = task->tk_rqstp; 511 struct rpc_xprt *xprt = req->rq_xprt; 512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 513 int ret = -EAGAIN; 514 515 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 516 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 517 req->rq_slen); 518 519 /* Protect against races with write_space */ 520 spin_lock_bh(&xprt->transport_lock); 521 522 /* Don't race with disconnect */ 523 if (xprt_connected(xprt)) { 524 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 525 /* 526 * Notify TCP that we're limited by the application 527 * window size 528 */ 529 set_bit(SOCK_NOSPACE, &transport->sock->flags); 530 transport->inet->sk_write_pending++; 531 /* ...and wait for more buffer space */ 532 xprt_wait_for_buffer_space(task, xs_nospace_callback); 533 } 534 } else { 535 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 536 ret = -ENOTCONN; 537 } 538 539 spin_unlock_bh(&xprt->transport_lock); 540 return ret; 541 } 542 543 /* 544 * Construct a stream transport record marker in @buf. 545 */ 546 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 547 { 548 u32 reclen = buf->len - sizeof(rpc_fraghdr); 549 rpc_fraghdr *base = buf->head[0].iov_base; 550 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 551 } 552 553 /** 554 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 555 * @task: RPC task that manages the state of an RPC request 556 * 557 * Return values: 558 * 0: The request has been sent 559 * EAGAIN: The socket was blocked, please call again later to 560 * complete the request 561 * ENOTCONN: Caller needs to invoke connect logic then call again 562 * other: Some other error occured, the request was not sent 563 */ 564 static int xs_local_send_request(struct rpc_task *task) 565 { 566 struct rpc_rqst *req = task->tk_rqstp; 567 struct rpc_xprt *xprt = req->rq_xprt; 568 struct sock_xprt *transport = 569 container_of(xprt, struct sock_xprt, xprt); 570 struct xdr_buf *xdr = &req->rq_snd_buf; 571 int status; 572 573 xs_encode_stream_record_marker(&req->rq_snd_buf); 574 575 xs_pktdump("packet data:", 576 req->rq_svec->iov_base, req->rq_svec->iov_len); 577 578 status = xs_sendpages(transport->sock, NULL, 0, 579 xdr, req->rq_bytes_sent, true); 580 dprintk("RPC: %s(%u) = %d\n", 581 __func__, xdr->len - req->rq_bytes_sent, status); 582 if (likely(status >= 0)) { 583 req->rq_bytes_sent += status; 584 req->rq_xmit_bytes_sent += status; 585 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 586 req->rq_bytes_sent = 0; 587 return 0; 588 } 589 status = -EAGAIN; 590 } 591 592 switch (status) { 593 case -EAGAIN: 594 status = xs_nospace(task); 595 break; 596 default: 597 dprintk("RPC: sendmsg returned unrecognized error %d\n", 598 -status); 599 case -EPIPE: 600 xs_close(xprt); 601 status = -ENOTCONN; 602 } 603 604 return status; 605 } 606 607 /** 608 * xs_udp_send_request - write an RPC request to a UDP socket 609 * @task: address of RPC task that manages the state of an RPC request 610 * 611 * Return values: 612 * 0: The request has been sent 613 * EAGAIN: The socket was blocked, please call again later to 614 * complete the request 615 * ENOTCONN: Caller needs to invoke connect logic then call again 616 * other: Some other error occurred, the request was not sent 617 */ 618 static int xs_udp_send_request(struct rpc_task *task) 619 { 620 struct rpc_rqst *req = task->tk_rqstp; 621 struct rpc_xprt *xprt = req->rq_xprt; 622 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 623 struct xdr_buf *xdr = &req->rq_snd_buf; 624 int status; 625 626 xs_pktdump("packet data:", 627 req->rq_svec->iov_base, 628 req->rq_svec->iov_len); 629 630 if (!xprt_bound(xprt)) 631 return -ENOTCONN; 632 status = xs_sendpages(transport->sock, 633 xs_addr(xprt), 634 xprt->addrlen, xdr, 635 req->rq_bytes_sent, true); 636 637 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 638 xdr->len - req->rq_bytes_sent, status); 639 640 if (status >= 0) { 641 req->rq_xmit_bytes_sent += status; 642 if (status >= req->rq_slen) 643 return 0; 644 /* Still some bytes left; set up for a retry later. */ 645 status = -EAGAIN; 646 } 647 648 switch (status) { 649 case -ENOTSOCK: 650 status = -ENOTCONN; 651 /* Should we call xs_close() here? */ 652 break; 653 case -EAGAIN: 654 status = xs_nospace(task); 655 break; 656 default: 657 dprintk("RPC: sendmsg returned unrecognized error %d\n", 658 -status); 659 case -ENETUNREACH: 660 case -EPIPE: 661 case -ECONNREFUSED: 662 /* When the server has died, an ICMP port unreachable message 663 * prompts ECONNREFUSED. */ 664 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 665 } 666 667 return status; 668 } 669 670 /** 671 * xs_tcp_shutdown - gracefully shut down a TCP socket 672 * @xprt: transport 673 * 674 * Initiates a graceful shutdown of the TCP socket by calling the 675 * equivalent of shutdown(SHUT_WR); 676 */ 677 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 678 { 679 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 680 struct socket *sock = transport->sock; 681 682 if (sock != NULL) { 683 kernel_sock_shutdown(sock, SHUT_WR); 684 trace_rpc_socket_shutdown(xprt, sock); 685 } 686 } 687 688 /** 689 * xs_tcp_send_request - write an RPC request to a TCP socket 690 * @task: address of RPC task that manages the state of an RPC request 691 * 692 * Return values: 693 * 0: The request has been sent 694 * EAGAIN: The socket was blocked, please call again later to 695 * complete the request 696 * ENOTCONN: Caller needs to invoke connect logic then call again 697 * other: Some other error occurred, the request was not sent 698 * 699 * XXX: In the case of soft timeouts, should we eventually give up 700 * if sendmsg is not able to make progress? 701 */ 702 static int xs_tcp_send_request(struct rpc_task *task) 703 { 704 struct rpc_rqst *req = task->tk_rqstp; 705 struct rpc_xprt *xprt = req->rq_xprt; 706 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 707 struct xdr_buf *xdr = &req->rq_snd_buf; 708 bool zerocopy = true; 709 int status; 710 711 xs_encode_stream_record_marker(&req->rq_snd_buf); 712 713 xs_pktdump("packet data:", 714 req->rq_svec->iov_base, 715 req->rq_svec->iov_len); 716 /* Don't use zero copy if this is a resend. If the RPC call 717 * completes while the socket holds a reference to the pages, 718 * then we may end up resending corrupted data. 719 */ 720 if (task->tk_flags & RPC_TASK_SENT) 721 zerocopy = false; 722 723 /* Continue transmitting the packet/record. We must be careful 724 * to cope with writespace callbacks arriving _after_ we have 725 * called sendmsg(). */ 726 while (1) { 727 status = xs_sendpages(transport->sock, 728 NULL, 0, xdr, req->rq_bytes_sent, 729 zerocopy); 730 731 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 732 xdr->len - req->rq_bytes_sent, status); 733 734 if (unlikely(status < 0)) 735 break; 736 737 /* If we've sent the entire packet, immediately 738 * reset the count of bytes sent. */ 739 req->rq_bytes_sent += status; 740 req->rq_xmit_bytes_sent += status; 741 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 742 req->rq_bytes_sent = 0; 743 return 0; 744 } 745 746 if (status != 0) 747 continue; 748 status = -EAGAIN; 749 break; 750 } 751 752 switch (status) { 753 case -ENOTSOCK: 754 status = -ENOTCONN; 755 /* Should we call xs_close() here? */ 756 break; 757 case -EAGAIN: 758 status = xs_nospace(task); 759 break; 760 default: 761 dprintk("RPC: sendmsg returned unrecognized error %d\n", 762 -status); 763 case -ECONNRESET: 764 xs_tcp_shutdown(xprt); 765 case -ECONNREFUSED: 766 case -ENOTCONN: 767 case -EPIPE: 768 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 769 } 770 771 return status; 772 } 773 774 /** 775 * xs_tcp_release_xprt - clean up after a tcp transmission 776 * @xprt: transport 777 * @task: rpc task 778 * 779 * This cleans up if an error causes us to abort the transmission of a request. 780 * In this case, the socket may need to be reset in order to avoid confusing 781 * the server. 782 */ 783 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 784 { 785 struct rpc_rqst *req; 786 787 if (task != xprt->snd_task) 788 return; 789 if (task == NULL) 790 goto out_release; 791 req = task->tk_rqstp; 792 if (req == NULL) 793 goto out_release; 794 if (req->rq_bytes_sent == 0) 795 goto out_release; 796 if (req->rq_bytes_sent == req->rq_snd_buf.len) 797 goto out_release; 798 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 799 out_release: 800 xprt_release_xprt(xprt, task); 801 } 802 803 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 804 { 805 transport->old_data_ready = sk->sk_data_ready; 806 transport->old_state_change = sk->sk_state_change; 807 transport->old_write_space = sk->sk_write_space; 808 transport->old_error_report = sk->sk_error_report; 809 } 810 811 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 812 { 813 sk->sk_data_ready = transport->old_data_ready; 814 sk->sk_state_change = transport->old_state_change; 815 sk->sk_write_space = transport->old_write_space; 816 sk->sk_error_report = transport->old_error_report; 817 } 818 819 /** 820 * xs_error_report - callback to handle TCP socket state errors 821 * @sk: socket 822 * 823 * Note: we don't call sock_error() since there may be a rpc_task 824 * using the socket, and so we don't want to clear sk->sk_err. 825 */ 826 static void xs_error_report(struct sock *sk) 827 { 828 struct rpc_xprt *xprt; 829 int err; 830 831 read_lock_bh(&sk->sk_callback_lock); 832 if (!(xprt = xprt_from_sock(sk))) 833 goto out; 834 835 err = -sk->sk_err; 836 if (err == 0) 837 goto out; 838 dprintk("RPC: xs_error_report client %p, error=%d...\n", 839 xprt, -err); 840 trace_rpc_socket_error(xprt, sk->sk_socket, err); 841 xprt_wake_pending_tasks(xprt, err); 842 out: 843 read_unlock_bh(&sk->sk_callback_lock); 844 } 845 846 static void xs_reset_transport(struct sock_xprt *transport) 847 { 848 struct socket *sock = transport->sock; 849 struct sock *sk = transport->inet; 850 851 if (sk == NULL) 852 return; 853 854 transport->srcport = 0; 855 856 write_lock_bh(&sk->sk_callback_lock); 857 transport->inet = NULL; 858 transport->sock = NULL; 859 860 sk->sk_user_data = NULL; 861 862 xs_restore_old_callbacks(transport, sk); 863 write_unlock_bh(&sk->sk_callback_lock); 864 865 sk->sk_no_check = 0; 866 867 trace_rpc_socket_close(&transport->xprt, sock); 868 sock_release(sock); 869 } 870 871 /** 872 * xs_close - close a socket 873 * @xprt: transport 874 * 875 * This is used when all requests are complete; ie, no DRC state remains 876 * on the server we want to save. 877 * 878 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 879 * xs_reset_transport() zeroing the socket from underneath a writer. 880 */ 881 static void xs_close(struct rpc_xprt *xprt) 882 { 883 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 884 885 dprintk("RPC: xs_close xprt %p\n", xprt); 886 887 cancel_delayed_work_sync(&transport->connect_worker); 888 889 xs_reset_transport(transport); 890 xprt->reestablish_timeout = 0; 891 892 smp_mb__before_clear_bit(); 893 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 894 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 895 clear_bit(XPRT_CLOSING, &xprt->state); 896 smp_mb__after_clear_bit(); 897 xprt_disconnect_done(xprt); 898 } 899 900 static void xs_tcp_close(struct rpc_xprt *xprt) 901 { 902 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 903 xs_close(xprt); 904 else 905 xs_tcp_shutdown(xprt); 906 } 907 908 /** 909 * xs_destroy - prepare to shutdown a transport 910 * @xprt: doomed transport 911 * 912 */ 913 static void xs_destroy(struct rpc_xprt *xprt) 914 { 915 dprintk("RPC: xs_destroy xprt %p\n", xprt); 916 917 xs_close(xprt); 918 xs_free_peer_addresses(xprt); 919 xprt_free(xprt); 920 module_put(THIS_MODULE); 921 } 922 923 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 924 { 925 struct xdr_skb_reader desc = { 926 .skb = skb, 927 .offset = sizeof(rpc_fraghdr), 928 .count = skb->len - sizeof(rpc_fraghdr), 929 }; 930 931 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 932 return -1; 933 if (desc.count) 934 return -1; 935 return 0; 936 } 937 938 /** 939 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 940 * @sk: socket with data to read 941 * @len: how much data to read 942 * 943 * Currently this assumes we can read the whole reply in a single gulp. 944 */ 945 static void xs_local_data_ready(struct sock *sk, int len) 946 { 947 struct rpc_task *task; 948 struct rpc_xprt *xprt; 949 struct rpc_rqst *rovr; 950 struct sk_buff *skb; 951 int err, repsize, copied; 952 u32 _xid; 953 __be32 *xp; 954 955 read_lock_bh(&sk->sk_callback_lock); 956 dprintk("RPC: %s...\n", __func__); 957 xprt = xprt_from_sock(sk); 958 if (xprt == NULL) 959 goto out; 960 961 skb = skb_recv_datagram(sk, 0, 1, &err); 962 if (skb == NULL) 963 goto out; 964 965 repsize = skb->len - sizeof(rpc_fraghdr); 966 if (repsize < 4) { 967 dprintk("RPC: impossible RPC reply size %d\n", repsize); 968 goto dropit; 969 } 970 971 /* Copy the XID from the skb... */ 972 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 973 if (xp == NULL) 974 goto dropit; 975 976 /* Look up and lock the request corresponding to the given XID */ 977 spin_lock(&xprt->transport_lock); 978 rovr = xprt_lookup_rqst(xprt, *xp); 979 if (!rovr) 980 goto out_unlock; 981 task = rovr->rq_task; 982 983 copied = rovr->rq_private_buf.buflen; 984 if (copied > repsize) 985 copied = repsize; 986 987 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 988 dprintk("RPC: sk_buff copy failed\n"); 989 goto out_unlock; 990 } 991 992 xprt_complete_rqst(task, copied); 993 994 out_unlock: 995 spin_unlock(&xprt->transport_lock); 996 dropit: 997 skb_free_datagram(sk, skb); 998 out: 999 read_unlock_bh(&sk->sk_callback_lock); 1000 } 1001 1002 /** 1003 * xs_udp_data_ready - "data ready" callback for UDP sockets 1004 * @sk: socket with data to read 1005 * @len: how much data to read 1006 * 1007 */ 1008 static void xs_udp_data_ready(struct sock *sk, int len) 1009 { 1010 struct rpc_task *task; 1011 struct rpc_xprt *xprt; 1012 struct rpc_rqst *rovr; 1013 struct sk_buff *skb; 1014 int err, repsize, copied; 1015 u32 _xid; 1016 __be32 *xp; 1017 1018 read_lock_bh(&sk->sk_callback_lock); 1019 dprintk("RPC: xs_udp_data_ready...\n"); 1020 if (!(xprt = xprt_from_sock(sk))) 1021 goto out; 1022 1023 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 1024 goto out; 1025 1026 repsize = skb->len - sizeof(struct udphdr); 1027 if (repsize < 4) { 1028 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1029 goto dropit; 1030 } 1031 1032 /* Copy the XID from the skb... */ 1033 xp = skb_header_pointer(skb, sizeof(struct udphdr), 1034 sizeof(_xid), &_xid); 1035 if (xp == NULL) 1036 goto dropit; 1037 1038 /* Look up and lock the request corresponding to the given XID */ 1039 spin_lock(&xprt->transport_lock); 1040 rovr = xprt_lookup_rqst(xprt, *xp); 1041 if (!rovr) 1042 goto out_unlock; 1043 task = rovr->rq_task; 1044 1045 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1046 copied = repsize; 1047 1048 /* Suck it into the iovec, verify checksum if not done by hw. */ 1049 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1050 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1051 goto out_unlock; 1052 } 1053 1054 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1055 1056 xprt_adjust_cwnd(xprt, task, copied); 1057 xprt_complete_rqst(task, copied); 1058 1059 out_unlock: 1060 spin_unlock(&xprt->transport_lock); 1061 dropit: 1062 skb_free_datagram(sk, skb); 1063 out: 1064 read_unlock_bh(&sk->sk_callback_lock); 1065 } 1066 1067 /* 1068 * Helper function to force a TCP close if the server is sending 1069 * junk and/or it has put us in CLOSE_WAIT 1070 */ 1071 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1072 { 1073 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1074 xprt_force_disconnect(xprt); 1075 } 1076 1077 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1078 { 1079 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1080 size_t len, used; 1081 char *p; 1082 1083 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1084 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1085 used = xdr_skb_read_bits(desc, p, len); 1086 transport->tcp_offset += used; 1087 if (used != len) 1088 return; 1089 1090 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1091 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1092 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1093 else 1094 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1095 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1096 1097 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1098 transport->tcp_offset = 0; 1099 1100 /* Sanity check of the record length */ 1101 if (unlikely(transport->tcp_reclen < 8)) { 1102 dprintk("RPC: invalid TCP record fragment length\n"); 1103 xs_tcp_force_close(xprt); 1104 return; 1105 } 1106 dprintk("RPC: reading TCP record fragment of length %d\n", 1107 transport->tcp_reclen); 1108 } 1109 1110 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1111 { 1112 if (transport->tcp_offset == transport->tcp_reclen) { 1113 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1114 transport->tcp_offset = 0; 1115 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1116 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1117 transport->tcp_flags |= TCP_RCV_COPY_XID; 1118 transport->tcp_copied = 0; 1119 } 1120 } 1121 } 1122 1123 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1124 { 1125 size_t len, used; 1126 char *p; 1127 1128 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1129 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1130 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1131 used = xdr_skb_read_bits(desc, p, len); 1132 transport->tcp_offset += used; 1133 if (used != len) 1134 return; 1135 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1136 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1137 transport->tcp_copied = 4; 1138 dprintk("RPC: reading %s XID %08x\n", 1139 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1140 : "request with", 1141 ntohl(transport->tcp_xid)); 1142 xs_tcp_check_fraghdr(transport); 1143 } 1144 1145 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1146 struct xdr_skb_reader *desc) 1147 { 1148 size_t len, used; 1149 u32 offset; 1150 char *p; 1151 1152 /* 1153 * We want transport->tcp_offset to be 8 at the end of this routine 1154 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1155 * When this function is called for the first time, 1156 * transport->tcp_offset is 4 (after having already read the xid). 1157 */ 1158 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1159 len = sizeof(transport->tcp_calldir) - offset; 1160 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1161 p = ((char *) &transport->tcp_calldir) + offset; 1162 used = xdr_skb_read_bits(desc, p, len); 1163 transport->tcp_offset += used; 1164 if (used != len) 1165 return; 1166 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1167 /* 1168 * We don't yet have the XDR buffer, so we will write the calldir 1169 * out after we get the buffer from the 'struct rpc_rqst' 1170 */ 1171 switch (ntohl(transport->tcp_calldir)) { 1172 case RPC_REPLY: 1173 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1174 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1175 transport->tcp_flags |= TCP_RPC_REPLY; 1176 break; 1177 case RPC_CALL: 1178 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1179 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1180 transport->tcp_flags &= ~TCP_RPC_REPLY; 1181 break; 1182 default: 1183 dprintk("RPC: invalid request message type\n"); 1184 xs_tcp_force_close(&transport->xprt); 1185 } 1186 xs_tcp_check_fraghdr(transport); 1187 } 1188 1189 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1190 struct xdr_skb_reader *desc, 1191 struct rpc_rqst *req) 1192 { 1193 struct sock_xprt *transport = 1194 container_of(xprt, struct sock_xprt, xprt); 1195 struct xdr_buf *rcvbuf; 1196 size_t len; 1197 ssize_t r; 1198 1199 rcvbuf = &req->rq_private_buf; 1200 1201 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1202 /* 1203 * Save the RPC direction in the XDR buffer 1204 */ 1205 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1206 &transport->tcp_calldir, 1207 sizeof(transport->tcp_calldir)); 1208 transport->tcp_copied += sizeof(transport->tcp_calldir); 1209 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1210 } 1211 1212 len = desc->count; 1213 if (len > transport->tcp_reclen - transport->tcp_offset) { 1214 struct xdr_skb_reader my_desc; 1215 1216 len = transport->tcp_reclen - transport->tcp_offset; 1217 memcpy(&my_desc, desc, sizeof(my_desc)); 1218 my_desc.count = len; 1219 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1220 &my_desc, xdr_skb_read_bits); 1221 desc->count -= r; 1222 desc->offset += r; 1223 } else 1224 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1225 desc, xdr_skb_read_bits); 1226 1227 if (r > 0) { 1228 transport->tcp_copied += r; 1229 transport->tcp_offset += r; 1230 } 1231 if (r != len) { 1232 /* Error when copying to the receive buffer, 1233 * usually because we weren't able to allocate 1234 * additional buffer pages. All we can do now 1235 * is turn off TCP_RCV_COPY_DATA, so the request 1236 * will not receive any additional updates, 1237 * and time out. 1238 * Any remaining data from this record will 1239 * be discarded. 1240 */ 1241 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1242 dprintk("RPC: XID %08x truncated request\n", 1243 ntohl(transport->tcp_xid)); 1244 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1245 "tcp_offset = %u, tcp_reclen = %u\n", 1246 xprt, transport->tcp_copied, 1247 transport->tcp_offset, transport->tcp_reclen); 1248 return; 1249 } 1250 1251 dprintk("RPC: XID %08x read %Zd bytes\n", 1252 ntohl(transport->tcp_xid), r); 1253 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1254 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1255 transport->tcp_offset, transport->tcp_reclen); 1256 1257 if (transport->tcp_copied == req->rq_private_buf.buflen) 1258 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1259 else if (transport->tcp_offset == transport->tcp_reclen) { 1260 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1261 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1262 } 1263 } 1264 1265 /* 1266 * Finds the request corresponding to the RPC xid and invokes the common 1267 * tcp read code to read the data. 1268 */ 1269 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1270 struct xdr_skb_reader *desc) 1271 { 1272 struct sock_xprt *transport = 1273 container_of(xprt, struct sock_xprt, xprt); 1274 struct rpc_rqst *req; 1275 1276 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1277 1278 /* Find and lock the request corresponding to this xid */ 1279 spin_lock(&xprt->transport_lock); 1280 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1281 if (!req) { 1282 dprintk("RPC: XID %08x request not found!\n", 1283 ntohl(transport->tcp_xid)); 1284 spin_unlock(&xprt->transport_lock); 1285 return -1; 1286 } 1287 1288 xs_tcp_read_common(xprt, desc, req); 1289 1290 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1291 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1292 1293 spin_unlock(&xprt->transport_lock); 1294 return 0; 1295 } 1296 1297 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1298 /* 1299 * Obtains an rpc_rqst previously allocated and invokes the common 1300 * tcp read code to read the data. The result is placed in the callback 1301 * queue. 1302 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1303 * connection and return -1. 1304 */ 1305 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1306 struct xdr_skb_reader *desc) 1307 { 1308 struct sock_xprt *transport = 1309 container_of(xprt, struct sock_xprt, xprt); 1310 struct rpc_rqst *req; 1311 1312 req = xprt_alloc_bc_request(xprt); 1313 if (req == NULL) { 1314 printk(KERN_WARNING "Callback slot table overflowed\n"); 1315 xprt_force_disconnect(xprt); 1316 return -1; 1317 } 1318 1319 req->rq_xid = transport->tcp_xid; 1320 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1321 xs_tcp_read_common(xprt, desc, req); 1322 1323 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1324 struct svc_serv *bc_serv = xprt->bc_serv; 1325 1326 /* 1327 * Add callback request to callback list. The callback 1328 * service sleeps on the sv_cb_waitq waiting for new 1329 * requests. Wake it up after adding enqueing the 1330 * request. 1331 */ 1332 dprintk("RPC: add callback request to list\n"); 1333 spin_lock(&bc_serv->sv_cb_lock); 1334 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1335 spin_unlock(&bc_serv->sv_cb_lock); 1336 wake_up(&bc_serv->sv_cb_waitq); 1337 } 1338 1339 req->rq_private_buf.len = transport->tcp_copied; 1340 1341 return 0; 1342 } 1343 1344 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1345 struct xdr_skb_reader *desc) 1346 { 1347 struct sock_xprt *transport = 1348 container_of(xprt, struct sock_xprt, xprt); 1349 1350 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1351 xs_tcp_read_reply(xprt, desc) : 1352 xs_tcp_read_callback(xprt, desc); 1353 } 1354 #else 1355 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1356 struct xdr_skb_reader *desc) 1357 { 1358 return xs_tcp_read_reply(xprt, desc); 1359 } 1360 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1361 1362 /* 1363 * Read data off the transport. This can be either an RPC_CALL or an 1364 * RPC_REPLY. Relay the processing to helper functions. 1365 */ 1366 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1367 struct xdr_skb_reader *desc) 1368 { 1369 struct sock_xprt *transport = 1370 container_of(xprt, struct sock_xprt, xprt); 1371 1372 if (_xs_tcp_read_data(xprt, desc) == 0) 1373 xs_tcp_check_fraghdr(transport); 1374 else { 1375 /* 1376 * The transport_lock protects the request handling. 1377 * There's no need to hold it to update the tcp_flags. 1378 */ 1379 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1380 } 1381 } 1382 1383 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1384 { 1385 size_t len; 1386 1387 len = transport->tcp_reclen - transport->tcp_offset; 1388 if (len > desc->count) 1389 len = desc->count; 1390 desc->count -= len; 1391 desc->offset += len; 1392 transport->tcp_offset += len; 1393 dprintk("RPC: discarded %Zu bytes\n", len); 1394 xs_tcp_check_fraghdr(transport); 1395 } 1396 1397 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1398 { 1399 struct rpc_xprt *xprt = rd_desc->arg.data; 1400 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1401 struct xdr_skb_reader desc = { 1402 .skb = skb, 1403 .offset = offset, 1404 .count = len, 1405 }; 1406 1407 dprintk("RPC: xs_tcp_data_recv started\n"); 1408 do { 1409 /* Read in a new fragment marker if necessary */ 1410 /* Can we ever really expect to get completely empty fragments? */ 1411 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1412 xs_tcp_read_fraghdr(xprt, &desc); 1413 continue; 1414 } 1415 /* Read in the xid if necessary */ 1416 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1417 xs_tcp_read_xid(transport, &desc); 1418 continue; 1419 } 1420 /* Read in the call/reply flag */ 1421 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1422 xs_tcp_read_calldir(transport, &desc); 1423 continue; 1424 } 1425 /* Read in the request data */ 1426 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1427 xs_tcp_read_data(xprt, &desc); 1428 continue; 1429 } 1430 /* Skip over any trailing bytes on short reads */ 1431 xs_tcp_read_discard(transport, &desc); 1432 } while (desc.count); 1433 dprintk("RPC: xs_tcp_data_recv done\n"); 1434 return len - desc.count; 1435 } 1436 1437 /** 1438 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1439 * @sk: socket with data to read 1440 * @bytes: how much data to read 1441 * 1442 */ 1443 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1444 { 1445 struct rpc_xprt *xprt; 1446 read_descriptor_t rd_desc; 1447 int read; 1448 1449 dprintk("RPC: xs_tcp_data_ready...\n"); 1450 1451 read_lock_bh(&sk->sk_callback_lock); 1452 if (!(xprt = xprt_from_sock(sk))) 1453 goto out; 1454 /* Any data means we had a useful conversation, so 1455 * the we don't need to delay the next reconnect 1456 */ 1457 if (xprt->reestablish_timeout) 1458 xprt->reestablish_timeout = 0; 1459 1460 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1461 rd_desc.arg.data = xprt; 1462 do { 1463 rd_desc.count = 65536; 1464 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1465 } while (read > 0); 1466 out: 1467 read_unlock_bh(&sk->sk_callback_lock); 1468 } 1469 1470 /* 1471 * Do the equivalent of linger/linger2 handling for dealing with 1472 * broken servers that don't close the socket in a timely 1473 * fashion 1474 */ 1475 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1476 unsigned long timeout) 1477 { 1478 struct sock_xprt *transport; 1479 1480 if (xprt_test_and_set_connecting(xprt)) 1481 return; 1482 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1483 transport = container_of(xprt, struct sock_xprt, xprt); 1484 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1485 timeout); 1486 } 1487 1488 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1489 { 1490 struct sock_xprt *transport; 1491 1492 transport = container_of(xprt, struct sock_xprt, xprt); 1493 1494 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1495 !cancel_delayed_work(&transport->connect_worker)) 1496 return; 1497 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1498 xprt_clear_connecting(xprt); 1499 } 1500 1501 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1502 { 1503 smp_mb__before_clear_bit(); 1504 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1505 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1506 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1507 clear_bit(XPRT_CLOSING, &xprt->state); 1508 smp_mb__after_clear_bit(); 1509 } 1510 1511 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1512 { 1513 xs_sock_reset_connection_flags(xprt); 1514 /* Mark transport as closed and wake up all pending tasks */ 1515 xprt_disconnect_done(xprt); 1516 } 1517 1518 /** 1519 * xs_tcp_state_change - callback to handle TCP socket state changes 1520 * @sk: socket whose state has changed 1521 * 1522 */ 1523 static void xs_tcp_state_change(struct sock *sk) 1524 { 1525 struct rpc_xprt *xprt; 1526 1527 read_lock_bh(&sk->sk_callback_lock); 1528 if (!(xprt = xprt_from_sock(sk))) 1529 goto out; 1530 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1531 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1532 sk->sk_state, xprt_connected(xprt), 1533 sock_flag(sk, SOCK_DEAD), 1534 sock_flag(sk, SOCK_ZAPPED), 1535 sk->sk_shutdown); 1536 1537 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1538 switch (sk->sk_state) { 1539 case TCP_ESTABLISHED: 1540 spin_lock(&xprt->transport_lock); 1541 if (!xprt_test_and_set_connected(xprt)) { 1542 struct sock_xprt *transport = container_of(xprt, 1543 struct sock_xprt, xprt); 1544 1545 /* Reset TCP record info */ 1546 transport->tcp_offset = 0; 1547 transport->tcp_reclen = 0; 1548 transport->tcp_copied = 0; 1549 transport->tcp_flags = 1550 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1551 xprt->connect_cookie++; 1552 1553 xprt_wake_pending_tasks(xprt, -EAGAIN); 1554 } 1555 spin_unlock(&xprt->transport_lock); 1556 break; 1557 case TCP_FIN_WAIT1: 1558 /* The client initiated a shutdown of the socket */ 1559 xprt->connect_cookie++; 1560 xprt->reestablish_timeout = 0; 1561 set_bit(XPRT_CLOSING, &xprt->state); 1562 smp_mb__before_clear_bit(); 1563 clear_bit(XPRT_CONNECTED, &xprt->state); 1564 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1565 smp_mb__after_clear_bit(); 1566 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1567 break; 1568 case TCP_CLOSE_WAIT: 1569 /* The server initiated a shutdown of the socket */ 1570 xprt->connect_cookie++; 1571 clear_bit(XPRT_CONNECTED, &xprt->state); 1572 xs_tcp_force_close(xprt); 1573 case TCP_CLOSING: 1574 /* 1575 * If the server closed down the connection, make sure that 1576 * we back off before reconnecting 1577 */ 1578 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1579 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1580 break; 1581 case TCP_LAST_ACK: 1582 set_bit(XPRT_CLOSING, &xprt->state); 1583 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1584 smp_mb__before_clear_bit(); 1585 clear_bit(XPRT_CONNECTED, &xprt->state); 1586 smp_mb__after_clear_bit(); 1587 break; 1588 case TCP_CLOSE: 1589 xs_tcp_cancel_linger_timeout(xprt); 1590 xs_sock_mark_closed(xprt); 1591 } 1592 out: 1593 read_unlock_bh(&sk->sk_callback_lock); 1594 } 1595 1596 static void xs_write_space(struct sock *sk) 1597 { 1598 struct socket *sock; 1599 struct rpc_xprt *xprt; 1600 1601 if (unlikely(!(sock = sk->sk_socket))) 1602 return; 1603 clear_bit(SOCK_NOSPACE, &sock->flags); 1604 1605 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1606 return; 1607 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1608 return; 1609 1610 xprt_write_space(xprt); 1611 } 1612 1613 /** 1614 * xs_udp_write_space - callback invoked when socket buffer space 1615 * becomes available 1616 * @sk: socket whose state has changed 1617 * 1618 * Called when more output buffer space is available for this socket. 1619 * We try not to wake our writers until they can make "significant" 1620 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1621 * with a bunch of small requests. 1622 */ 1623 static void xs_udp_write_space(struct sock *sk) 1624 { 1625 read_lock_bh(&sk->sk_callback_lock); 1626 1627 /* from net/core/sock.c:sock_def_write_space */ 1628 if (sock_writeable(sk)) 1629 xs_write_space(sk); 1630 1631 read_unlock_bh(&sk->sk_callback_lock); 1632 } 1633 1634 /** 1635 * xs_tcp_write_space - callback invoked when socket buffer space 1636 * becomes available 1637 * @sk: socket whose state has changed 1638 * 1639 * Called when more output buffer space is available for this socket. 1640 * We try not to wake our writers until they can make "significant" 1641 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1642 * with a bunch of small requests. 1643 */ 1644 static void xs_tcp_write_space(struct sock *sk) 1645 { 1646 read_lock_bh(&sk->sk_callback_lock); 1647 1648 /* from net/core/stream.c:sk_stream_write_space */ 1649 if (sk_stream_is_writeable(sk)) 1650 xs_write_space(sk); 1651 1652 read_unlock_bh(&sk->sk_callback_lock); 1653 } 1654 1655 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1656 { 1657 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1658 struct sock *sk = transport->inet; 1659 1660 if (transport->rcvsize) { 1661 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1662 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1663 } 1664 if (transport->sndsize) { 1665 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1666 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1667 sk->sk_write_space(sk); 1668 } 1669 } 1670 1671 /** 1672 * xs_udp_set_buffer_size - set send and receive limits 1673 * @xprt: generic transport 1674 * @sndsize: requested size of send buffer, in bytes 1675 * @rcvsize: requested size of receive buffer, in bytes 1676 * 1677 * Set socket send and receive buffer size limits. 1678 */ 1679 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1680 { 1681 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1682 1683 transport->sndsize = 0; 1684 if (sndsize) 1685 transport->sndsize = sndsize + 1024; 1686 transport->rcvsize = 0; 1687 if (rcvsize) 1688 transport->rcvsize = rcvsize + 1024; 1689 1690 xs_udp_do_set_buffer_size(xprt); 1691 } 1692 1693 /** 1694 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1695 * @task: task that timed out 1696 * 1697 * Adjust the congestion window after a retransmit timeout has occurred. 1698 */ 1699 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1700 { 1701 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1702 } 1703 1704 static unsigned short xs_get_random_port(void) 1705 { 1706 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1707 unsigned short rand = (unsigned short) prandom_u32() % range; 1708 return rand + xprt_min_resvport; 1709 } 1710 1711 /** 1712 * xs_set_port - reset the port number in the remote endpoint address 1713 * @xprt: generic transport 1714 * @port: new port number 1715 * 1716 */ 1717 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1718 { 1719 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1720 1721 rpc_set_port(xs_addr(xprt), port); 1722 xs_update_peer_port(xprt); 1723 } 1724 1725 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1726 { 1727 unsigned short port = transport->srcport; 1728 1729 if (port == 0 && transport->xprt.resvport) 1730 port = xs_get_random_port(); 1731 return port; 1732 } 1733 1734 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1735 { 1736 if (transport->srcport != 0) 1737 transport->srcport = 0; 1738 if (!transport->xprt.resvport) 1739 return 0; 1740 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1741 return xprt_max_resvport; 1742 return --port; 1743 } 1744 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1745 { 1746 struct sockaddr_storage myaddr; 1747 int err, nloop = 0; 1748 unsigned short port = xs_get_srcport(transport); 1749 unsigned short last; 1750 1751 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1752 do { 1753 rpc_set_port((struct sockaddr *)&myaddr, port); 1754 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1755 transport->xprt.addrlen); 1756 if (port == 0) 1757 break; 1758 if (err == 0) { 1759 transport->srcport = port; 1760 break; 1761 } 1762 last = port; 1763 port = xs_next_srcport(transport, port); 1764 if (port > last) 1765 nloop++; 1766 } while (err == -EADDRINUSE && nloop != 2); 1767 1768 if (myaddr.ss_family == AF_INET) 1769 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1770 &((struct sockaddr_in *)&myaddr)->sin_addr, 1771 port, err ? "failed" : "ok", err); 1772 else 1773 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1774 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1775 port, err ? "failed" : "ok", err); 1776 return err; 1777 } 1778 1779 /* 1780 * We don't support autobind on AF_LOCAL sockets 1781 */ 1782 static void xs_local_rpcbind(struct rpc_task *task) 1783 { 1784 rcu_read_lock(); 1785 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); 1786 rcu_read_unlock(); 1787 } 1788 1789 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1790 { 1791 } 1792 1793 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1794 static struct lock_class_key xs_key[2]; 1795 static struct lock_class_key xs_slock_key[2]; 1796 1797 static inline void xs_reclassify_socketu(struct socket *sock) 1798 { 1799 struct sock *sk = sock->sk; 1800 1801 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1802 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1803 } 1804 1805 static inline void xs_reclassify_socket4(struct socket *sock) 1806 { 1807 struct sock *sk = sock->sk; 1808 1809 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1810 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1811 } 1812 1813 static inline void xs_reclassify_socket6(struct socket *sock) 1814 { 1815 struct sock *sk = sock->sk; 1816 1817 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1818 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1819 } 1820 1821 static inline void xs_reclassify_socket(int family, struct socket *sock) 1822 { 1823 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1824 if (sock_owned_by_user(sock->sk)) 1825 return; 1826 1827 switch (family) { 1828 case AF_LOCAL: 1829 xs_reclassify_socketu(sock); 1830 break; 1831 case AF_INET: 1832 xs_reclassify_socket4(sock); 1833 break; 1834 case AF_INET6: 1835 xs_reclassify_socket6(sock); 1836 break; 1837 } 1838 } 1839 #else 1840 static inline void xs_reclassify_socketu(struct socket *sock) 1841 { 1842 } 1843 1844 static inline void xs_reclassify_socket4(struct socket *sock) 1845 { 1846 } 1847 1848 static inline void xs_reclassify_socket6(struct socket *sock) 1849 { 1850 } 1851 1852 static inline void xs_reclassify_socket(int family, struct socket *sock) 1853 { 1854 } 1855 #endif 1856 1857 static void xs_dummy_setup_socket(struct work_struct *work) 1858 { 1859 } 1860 1861 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1862 struct sock_xprt *transport, int family, int type, int protocol) 1863 { 1864 struct socket *sock; 1865 int err; 1866 1867 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1868 if (err < 0) { 1869 dprintk("RPC: can't create %d transport socket (%d).\n", 1870 protocol, -err); 1871 goto out; 1872 } 1873 xs_reclassify_socket(family, sock); 1874 1875 err = xs_bind(transport, sock); 1876 if (err) { 1877 sock_release(sock); 1878 goto out; 1879 } 1880 1881 return sock; 1882 out: 1883 return ERR_PTR(err); 1884 } 1885 1886 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1887 struct socket *sock) 1888 { 1889 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1890 xprt); 1891 1892 if (!transport->inet) { 1893 struct sock *sk = sock->sk; 1894 1895 write_lock_bh(&sk->sk_callback_lock); 1896 1897 xs_save_old_callbacks(transport, sk); 1898 1899 sk->sk_user_data = xprt; 1900 sk->sk_data_ready = xs_local_data_ready; 1901 sk->sk_write_space = xs_udp_write_space; 1902 sk->sk_error_report = xs_error_report; 1903 sk->sk_allocation = GFP_ATOMIC; 1904 1905 xprt_clear_connected(xprt); 1906 1907 /* Reset to new socket */ 1908 transport->sock = sock; 1909 transport->inet = sk; 1910 1911 write_unlock_bh(&sk->sk_callback_lock); 1912 } 1913 1914 /* Tell the socket layer to start connecting... */ 1915 xprt->stat.connect_count++; 1916 xprt->stat.connect_start = jiffies; 1917 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1918 } 1919 1920 /** 1921 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1922 * @xprt: RPC transport to connect 1923 * @transport: socket transport to connect 1924 * @create_sock: function to create a socket of the correct type 1925 */ 1926 static int xs_local_setup_socket(struct sock_xprt *transport) 1927 { 1928 struct rpc_xprt *xprt = &transport->xprt; 1929 struct socket *sock; 1930 int status = -EIO; 1931 1932 current->flags |= PF_FSTRANS; 1933 1934 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1935 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1936 SOCK_STREAM, 0, &sock, 1); 1937 if (status < 0) { 1938 dprintk("RPC: can't create AF_LOCAL " 1939 "transport socket (%d).\n", -status); 1940 goto out; 1941 } 1942 xs_reclassify_socketu(sock); 1943 1944 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1945 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1946 1947 status = xs_local_finish_connecting(xprt, sock); 1948 trace_rpc_socket_connect(xprt, sock, status); 1949 switch (status) { 1950 case 0: 1951 dprintk("RPC: xprt %p connected to %s\n", 1952 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1953 xprt_set_connected(xprt); 1954 break; 1955 case -ENOENT: 1956 dprintk("RPC: xprt %p: socket %s does not exist\n", 1957 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1958 break; 1959 case -ECONNREFUSED: 1960 dprintk("RPC: xprt %p: connection refused for %s\n", 1961 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1962 break; 1963 default: 1964 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1965 __func__, -status, 1966 xprt->address_strings[RPC_DISPLAY_ADDR]); 1967 } 1968 1969 out: 1970 xprt_clear_connecting(xprt); 1971 xprt_wake_pending_tasks(xprt, status); 1972 current->flags &= ~PF_FSTRANS; 1973 return status; 1974 } 1975 1976 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1977 { 1978 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1979 int ret; 1980 1981 if (RPC_IS_ASYNC(task)) { 1982 /* 1983 * We want the AF_LOCAL connect to be resolved in the 1984 * filesystem namespace of the process making the rpc 1985 * call. Thus we connect synchronously. 1986 * 1987 * If we want to support asynchronous AF_LOCAL calls, 1988 * we'll need to figure out how to pass a namespace to 1989 * connect. 1990 */ 1991 rpc_exit(task, -ENOTCONN); 1992 return; 1993 } 1994 ret = xs_local_setup_socket(transport); 1995 if (ret && !RPC_IS_SOFTCONN(task)) 1996 msleep_interruptible(15000); 1997 } 1998 1999 #ifdef CONFIG_SUNRPC_SWAP 2000 static void xs_set_memalloc(struct rpc_xprt *xprt) 2001 { 2002 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2003 xprt); 2004 2005 if (xprt->swapper) 2006 sk_set_memalloc(transport->inet); 2007 } 2008 2009 /** 2010 * xs_swapper - Tag this transport as being used for swap. 2011 * @xprt: transport to tag 2012 * @enable: enable/disable 2013 * 2014 */ 2015 int xs_swapper(struct rpc_xprt *xprt, int enable) 2016 { 2017 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2018 xprt); 2019 int err = 0; 2020 2021 if (enable) { 2022 xprt->swapper++; 2023 xs_set_memalloc(xprt); 2024 } else if (xprt->swapper) { 2025 xprt->swapper--; 2026 sk_clear_memalloc(transport->inet); 2027 } 2028 2029 return err; 2030 } 2031 EXPORT_SYMBOL_GPL(xs_swapper); 2032 #else 2033 static void xs_set_memalloc(struct rpc_xprt *xprt) 2034 { 2035 } 2036 #endif 2037 2038 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2039 { 2040 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2041 2042 if (!transport->inet) { 2043 struct sock *sk = sock->sk; 2044 2045 write_lock_bh(&sk->sk_callback_lock); 2046 2047 xs_save_old_callbacks(transport, sk); 2048 2049 sk->sk_user_data = xprt; 2050 sk->sk_data_ready = xs_udp_data_ready; 2051 sk->sk_write_space = xs_udp_write_space; 2052 sk->sk_no_check = UDP_CSUM_NORCV; 2053 sk->sk_allocation = GFP_ATOMIC; 2054 2055 xprt_set_connected(xprt); 2056 2057 /* Reset to new socket */ 2058 transport->sock = sock; 2059 transport->inet = sk; 2060 2061 xs_set_memalloc(xprt); 2062 2063 write_unlock_bh(&sk->sk_callback_lock); 2064 } 2065 xs_udp_do_set_buffer_size(xprt); 2066 } 2067 2068 static void xs_udp_setup_socket(struct work_struct *work) 2069 { 2070 struct sock_xprt *transport = 2071 container_of(work, struct sock_xprt, connect_worker.work); 2072 struct rpc_xprt *xprt = &transport->xprt; 2073 struct socket *sock = transport->sock; 2074 int status = -EIO; 2075 2076 current->flags |= PF_FSTRANS; 2077 2078 /* Start by resetting any existing state */ 2079 xs_reset_transport(transport); 2080 sock = xs_create_sock(xprt, transport, 2081 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 2082 if (IS_ERR(sock)) 2083 goto out; 2084 2085 dprintk("RPC: worker connecting xprt %p via %s to " 2086 "%s (port %s)\n", xprt, 2087 xprt->address_strings[RPC_DISPLAY_PROTO], 2088 xprt->address_strings[RPC_DISPLAY_ADDR], 2089 xprt->address_strings[RPC_DISPLAY_PORT]); 2090 2091 xs_udp_finish_connecting(xprt, sock); 2092 trace_rpc_socket_connect(xprt, sock, 0); 2093 status = 0; 2094 out: 2095 xprt_clear_connecting(xprt); 2096 xprt_wake_pending_tasks(xprt, status); 2097 current->flags &= ~PF_FSTRANS; 2098 } 2099 2100 /* 2101 * We need to preserve the port number so the reply cache on the server can 2102 * find our cached RPC replies when we get around to reconnecting. 2103 */ 2104 static void xs_abort_connection(struct sock_xprt *transport) 2105 { 2106 int result; 2107 struct sockaddr any; 2108 2109 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2110 2111 /* 2112 * Disconnect the transport socket by doing a connect operation 2113 * with AF_UNSPEC. This should return immediately... 2114 */ 2115 memset(&any, 0, sizeof(any)); 2116 any.sa_family = AF_UNSPEC; 2117 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2118 trace_rpc_socket_reset_connection(&transport->xprt, 2119 transport->sock, result); 2120 if (!result) 2121 xs_sock_reset_connection_flags(&transport->xprt); 2122 dprintk("RPC: AF_UNSPEC connect return code %d\n", result); 2123 } 2124 2125 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2126 { 2127 unsigned int state = transport->inet->sk_state; 2128 2129 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2130 /* we don't need to abort the connection if the socket 2131 * hasn't undergone a shutdown 2132 */ 2133 if (transport->inet->sk_shutdown == 0) 2134 return; 2135 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2136 __func__, transport->inet->sk_shutdown); 2137 } 2138 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2139 /* we don't need to abort the connection if the socket 2140 * hasn't undergone a shutdown 2141 */ 2142 if (transport->inet->sk_shutdown == 0) 2143 return; 2144 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2145 "sk_shutdown set to %d\n", 2146 __func__, transport->inet->sk_shutdown); 2147 } 2148 xs_abort_connection(transport); 2149 } 2150 2151 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2152 { 2153 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2154 int ret = -ENOTCONN; 2155 2156 if (!transport->inet) { 2157 struct sock *sk = sock->sk; 2158 unsigned int keepidle = xprt->timeout->to_initval / HZ; 2159 unsigned int keepcnt = xprt->timeout->to_retries + 1; 2160 unsigned int opt_on = 1; 2161 2162 /* TCP Keepalive options */ 2163 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2164 (char *)&opt_on, sizeof(opt_on)); 2165 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2166 (char *)&keepidle, sizeof(keepidle)); 2167 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2168 (char *)&keepidle, sizeof(keepidle)); 2169 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2170 (char *)&keepcnt, sizeof(keepcnt)); 2171 2172 write_lock_bh(&sk->sk_callback_lock); 2173 2174 xs_save_old_callbacks(transport, sk); 2175 2176 sk->sk_user_data = xprt; 2177 sk->sk_data_ready = xs_tcp_data_ready; 2178 sk->sk_state_change = xs_tcp_state_change; 2179 sk->sk_write_space = xs_tcp_write_space; 2180 sk->sk_error_report = xs_error_report; 2181 sk->sk_allocation = GFP_ATOMIC; 2182 2183 /* socket options */ 2184 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2185 sock_reset_flag(sk, SOCK_LINGER); 2186 tcp_sk(sk)->linger2 = 0; 2187 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2188 2189 xprt_clear_connected(xprt); 2190 2191 /* Reset to new socket */ 2192 transport->sock = sock; 2193 transport->inet = sk; 2194 2195 write_unlock_bh(&sk->sk_callback_lock); 2196 } 2197 2198 if (!xprt_bound(xprt)) 2199 goto out; 2200 2201 xs_set_memalloc(xprt); 2202 2203 /* Tell the socket layer to start connecting... */ 2204 xprt->stat.connect_count++; 2205 xprt->stat.connect_start = jiffies; 2206 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2207 switch (ret) { 2208 case 0: 2209 case -EINPROGRESS: 2210 /* SYN_SENT! */ 2211 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2212 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2213 } 2214 out: 2215 return ret; 2216 } 2217 2218 /** 2219 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2220 * @xprt: RPC transport to connect 2221 * @transport: socket transport to connect 2222 * @create_sock: function to create a socket of the correct type 2223 * 2224 * Invoked by a work queue tasklet. 2225 */ 2226 static void xs_tcp_setup_socket(struct work_struct *work) 2227 { 2228 struct sock_xprt *transport = 2229 container_of(work, struct sock_xprt, connect_worker.work); 2230 struct socket *sock = transport->sock; 2231 struct rpc_xprt *xprt = &transport->xprt; 2232 int status = -EIO; 2233 2234 current->flags |= PF_FSTRANS; 2235 2236 if (!sock) { 2237 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2238 sock = xs_create_sock(xprt, transport, 2239 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2240 if (IS_ERR(sock)) { 2241 status = PTR_ERR(sock); 2242 goto out; 2243 } 2244 } else { 2245 int abort_and_exit; 2246 2247 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2248 &xprt->state); 2249 /* "close" the socket, preserving the local port */ 2250 xs_tcp_reuse_connection(transport); 2251 2252 if (abort_and_exit) 2253 goto out_eagain; 2254 } 2255 2256 dprintk("RPC: worker connecting xprt %p via %s to " 2257 "%s (port %s)\n", xprt, 2258 xprt->address_strings[RPC_DISPLAY_PROTO], 2259 xprt->address_strings[RPC_DISPLAY_ADDR], 2260 xprt->address_strings[RPC_DISPLAY_PORT]); 2261 2262 status = xs_tcp_finish_connecting(xprt, sock); 2263 trace_rpc_socket_connect(xprt, sock, status); 2264 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2265 xprt, -status, xprt_connected(xprt), 2266 sock->sk->sk_state); 2267 switch (status) { 2268 default: 2269 printk("%s: connect returned unhandled error %d\n", 2270 __func__, status); 2271 case -EADDRNOTAVAIL: 2272 /* We're probably in TIME_WAIT. Get rid of existing socket, 2273 * and retry 2274 */ 2275 xs_tcp_force_close(xprt); 2276 break; 2277 case 0: 2278 case -EINPROGRESS: 2279 case -EALREADY: 2280 xprt_clear_connecting(xprt); 2281 current->flags &= ~PF_FSTRANS; 2282 return; 2283 case -EINVAL: 2284 /* Happens, for instance, if the user specified a link 2285 * local IPv6 address without a scope-id. 2286 */ 2287 case -ECONNREFUSED: 2288 case -ECONNRESET: 2289 case -ENETUNREACH: 2290 /* retry with existing socket, after a delay */ 2291 goto out; 2292 } 2293 out_eagain: 2294 status = -EAGAIN; 2295 out: 2296 xprt_clear_connecting(xprt); 2297 xprt_wake_pending_tasks(xprt, status); 2298 current->flags &= ~PF_FSTRANS; 2299 } 2300 2301 /** 2302 * xs_connect - connect a socket to a remote endpoint 2303 * @xprt: pointer to transport structure 2304 * @task: address of RPC task that manages state of connect request 2305 * 2306 * TCP: If the remote end dropped the connection, delay reconnecting. 2307 * 2308 * UDP socket connects are synchronous, but we use a work queue anyway 2309 * to guarantee that even unprivileged user processes can set up a 2310 * socket on a privileged port. 2311 * 2312 * If a UDP socket connect fails, the delay behavior here prevents 2313 * retry floods (hard mounts). 2314 */ 2315 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2316 { 2317 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2318 2319 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2320 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2321 "seconds\n", 2322 xprt, xprt->reestablish_timeout / HZ); 2323 queue_delayed_work(rpciod_workqueue, 2324 &transport->connect_worker, 2325 xprt->reestablish_timeout); 2326 xprt->reestablish_timeout <<= 1; 2327 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2328 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2329 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2330 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2331 } else { 2332 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2333 queue_delayed_work(rpciod_workqueue, 2334 &transport->connect_worker, 0); 2335 } 2336 } 2337 2338 /** 2339 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2340 * @xprt: rpc_xprt struct containing statistics 2341 * @seq: output file 2342 * 2343 */ 2344 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2345 { 2346 long idle_time = 0; 2347 2348 if (xprt_connected(xprt)) 2349 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2350 2351 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2352 "%llu %llu %lu %llu %llu\n", 2353 xprt->stat.bind_count, 2354 xprt->stat.connect_count, 2355 xprt->stat.connect_time, 2356 idle_time, 2357 xprt->stat.sends, 2358 xprt->stat.recvs, 2359 xprt->stat.bad_xids, 2360 xprt->stat.req_u, 2361 xprt->stat.bklog_u, 2362 xprt->stat.max_slots, 2363 xprt->stat.sending_u, 2364 xprt->stat.pending_u); 2365 } 2366 2367 /** 2368 * xs_udp_print_stats - display UDP socket-specifc stats 2369 * @xprt: rpc_xprt struct containing statistics 2370 * @seq: output file 2371 * 2372 */ 2373 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2374 { 2375 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2376 2377 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2378 "%lu %llu %llu\n", 2379 transport->srcport, 2380 xprt->stat.bind_count, 2381 xprt->stat.sends, 2382 xprt->stat.recvs, 2383 xprt->stat.bad_xids, 2384 xprt->stat.req_u, 2385 xprt->stat.bklog_u, 2386 xprt->stat.max_slots, 2387 xprt->stat.sending_u, 2388 xprt->stat.pending_u); 2389 } 2390 2391 /** 2392 * xs_tcp_print_stats - display TCP socket-specifc stats 2393 * @xprt: rpc_xprt struct containing statistics 2394 * @seq: output file 2395 * 2396 */ 2397 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2398 { 2399 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2400 long idle_time = 0; 2401 2402 if (xprt_connected(xprt)) 2403 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2404 2405 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2406 "%llu %llu %lu %llu %llu\n", 2407 transport->srcport, 2408 xprt->stat.bind_count, 2409 xprt->stat.connect_count, 2410 xprt->stat.connect_time, 2411 idle_time, 2412 xprt->stat.sends, 2413 xprt->stat.recvs, 2414 xprt->stat.bad_xids, 2415 xprt->stat.req_u, 2416 xprt->stat.bklog_u, 2417 xprt->stat.max_slots, 2418 xprt->stat.sending_u, 2419 xprt->stat.pending_u); 2420 } 2421 2422 /* 2423 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2424 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2425 * to use the server side send routines. 2426 */ 2427 static void *bc_malloc(struct rpc_task *task, size_t size) 2428 { 2429 struct page *page; 2430 struct rpc_buffer *buf; 2431 2432 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2433 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2434 return NULL; 2435 2436 page = alloc_page(GFP_KERNEL); 2437 if (!page) 2438 return NULL; 2439 2440 buf = page_address(page); 2441 buf->len = PAGE_SIZE; 2442 2443 return buf->data; 2444 } 2445 2446 /* 2447 * Free the space allocated in the bc_alloc routine 2448 */ 2449 static void bc_free(void *buffer) 2450 { 2451 struct rpc_buffer *buf; 2452 2453 if (!buffer) 2454 return; 2455 2456 buf = container_of(buffer, struct rpc_buffer, data); 2457 free_page((unsigned long)buf); 2458 } 2459 2460 /* 2461 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2462 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2463 */ 2464 static int bc_sendto(struct rpc_rqst *req) 2465 { 2466 int len; 2467 struct xdr_buf *xbufp = &req->rq_snd_buf; 2468 struct rpc_xprt *xprt = req->rq_xprt; 2469 struct sock_xprt *transport = 2470 container_of(xprt, struct sock_xprt, xprt); 2471 struct socket *sock = transport->sock; 2472 unsigned long headoff; 2473 unsigned long tailoff; 2474 2475 xs_encode_stream_record_marker(xbufp); 2476 2477 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2478 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2479 len = svc_send_common(sock, xbufp, 2480 virt_to_page(xbufp->head[0].iov_base), headoff, 2481 xbufp->tail[0].iov_base, tailoff); 2482 2483 if (len != xbufp->len) { 2484 printk(KERN_NOTICE "Error sending entire callback!\n"); 2485 len = -EAGAIN; 2486 } 2487 2488 return len; 2489 } 2490 2491 /* 2492 * The send routine. Borrows from svc_send 2493 */ 2494 static int bc_send_request(struct rpc_task *task) 2495 { 2496 struct rpc_rqst *req = task->tk_rqstp; 2497 struct svc_xprt *xprt; 2498 u32 len; 2499 2500 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2501 /* 2502 * Get the server socket associated with this callback xprt 2503 */ 2504 xprt = req->rq_xprt->bc_xprt; 2505 2506 /* 2507 * Grab the mutex to serialize data as the connection is shared 2508 * with the fore channel 2509 */ 2510 if (!mutex_trylock(&xprt->xpt_mutex)) { 2511 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2512 if (!mutex_trylock(&xprt->xpt_mutex)) 2513 return -EAGAIN; 2514 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2515 } 2516 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2517 len = -ENOTCONN; 2518 else 2519 len = bc_sendto(req); 2520 mutex_unlock(&xprt->xpt_mutex); 2521 2522 if (len > 0) 2523 len = 0; 2524 2525 return len; 2526 } 2527 2528 /* 2529 * The close routine. Since this is client initiated, we do nothing 2530 */ 2531 2532 static void bc_close(struct rpc_xprt *xprt) 2533 { 2534 } 2535 2536 /* 2537 * The xprt destroy routine. Again, because this connection is client 2538 * initiated, we do nothing 2539 */ 2540 2541 static void bc_destroy(struct rpc_xprt *xprt) 2542 { 2543 } 2544 2545 static struct rpc_xprt_ops xs_local_ops = { 2546 .reserve_xprt = xprt_reserve_xprt, 2547 .release_xprt = xs_tcp_release_xprt, 2548 .alloc_slot = xprt_alloc_slot, 2549 .rpcbind = xs_local_rpcbind, 2550 .set_port = xs_local_set_port, 2551 .connect = xs_local_connect, 2552 .buf_alloc = rpc_malloc, 2553 .buf_free = rpc_free, 2554 .send_request = xs_local_send_request, 2555 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2556 .close = xs_close, 2557 .destroy = xs_destroy, 2558 .print_stats = xs_local_print_stats, 2559 }; 2560 2561 static struct rpc_xprt_ops xs_udp_ops = { 2562 .set_buffer_size = xs_udp_set_buffer_size, 2563 .reserve_xprt = xprt_reserve_xprt_cong, 2564 .release_xprt = xprt_release_xprt_cong, 2565 .alloc_slot = xprt_alloc_slot, 2566 .rpcbind = rpcb_getport_async, 2567 .set_port = xs_set_port, 2568 .connect = xs_connect, 2569 .buf_alloc = rpc_malloc, 2570 .buf_free = rpc_free, 2571 .send_request = xs_udp_send_request, 2572 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2573 .timer = xs_udp_timer, 2574 .release_request = xprt_release_rqst_cong, 2575 .close = xs_close, 2576 .destroy = xs_destroy, 2577 .print_stats = xs_udp_print_stats, 2578 }; 2579 2580 static struct rpc_xprt_ops xs_tcp_ops = { 2581 .reserve_xprt = xprt_reserve_xprt, 2582 .release_xprt = xs_tcp_release_xprt, 2583 .alloc_slot = xprt_lock_and_alloc_slot, 2584 .rpcbind = rpcb_getport_async, 2585 .set_port = xs_set_port, 2586 .connect = xs_connect, 2587 .buf_alloc = rpc_malloc, 2588 .buf_free = rpc_free, 2589 .send_request = xs_tcp_send_request, 2590 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2591 .close = xs_tcp_close, 2592 .destroy = xs_destroy, 2593 .print_stats = xs_tcp_print_stats, 2594 }; 2595 2596 /* 2597 * The rpc_xprt_ops for the server backchannel 2598 */ 2599 2600 static struct rpc_xprt_ops bc_tcp_ops = { 2601 .reserve_xprt = xprt_reserve_xprt, 2602 .release_xprt = xprt_release_xprt, 2603 .alloc_slot = xprt_alloc_slot, 2604 .buf_alloc = bc_malloc, 2605 .buf_free = bc_free, 2606 .send_request = bc_send_request, 2607 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2608 .close = bc_close, 2609 .destroy = bc_destroy, 2610 .print_stats = xs_tcp_print_stats, 2611 }; 2612 2613 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2614 { 2615 static const struct sockaddr_in sin = { 2616 .sin_family = AF_INET, 2617 .sin_addr.s_addr = htonl(INADDR_ANY), 2618 }; 2619 static const struct sockaddr_in6 sin6 = { 2620 .sin6_family = AF_INET6, 2621 .sin6_addr = IN6ADDR_ANY_INIT, 2622 }; 2623 2624 switch (family) { 2625 case AF_LOCAL: 2626 break; 2627 case AF_INET: 2628 memcpy(sap, &sin, sizeof(sin)); 2629 break; 2630 case AF_INET6: 2631 memcpy(sap, &sin6, sizeof(sin6)); 2632 break; 2633 default: 2634 dprintk("RPC: %s: Bad address family\n", __func__); 2635 return -EAFNOSUPPORT; 2636 } 2637 return 0; 2638 } 2639 2640 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2641 unsigned int slot_table_size, 2642 unsigned int max_slot_table_size) 2643 { 2644 struct rpc_xprt *xprt; 2645 struct sock_xprt *new; 2646 2647 if (args->addrlen > sizeof(xprt->addr)) { 2648 dprintk("RPC: xs_setup_xprt: address too large\n"); 2649 return ERR_PTR(-EBADF); 2650 } 2651 2652 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2653 max_slot_table_size); 2654 if (xprt == NULL) { 2655 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2656 "rpc_xprt\n"); 2657 return ERR_PTR(-ENOMEM); 2658 } 2659 2660 new = container_of(xprt, struct sock_xprt, xprt); 2661 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2662 xprt->addrlen = args->addrlen; 2663 if (args->srcaddr) 2664 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2665 else { 2666 int err; 2667 err = xs_init_anyaddr(args->dstaddr->sa_family, 2668 (struct sockaddr *)&new->srcaddr); 2669 if (err != 0) { 2670 xprt_free(xprt); 2671 return ERR_PTR(err); 2672 } 2673 } 2674 2675 return xprt; 2676 } 2677 2678 static const struct rpc_timeout xs_local_default_timeout = { 2679 .to_initval = 10 * HZ, 2680 .to_maxval = 10 * HZ, 2681 .to_retries = 2, 2682 }; 2683 2684 /** 2685 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2686 * @args: rpc transport creation arguments 2687 * 2688 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2689 */ 2690 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2691 { 2692 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2693 struct sock_xprt *transport; 2694 struct rpc_xprt *xprt; 2695 struct rpc_xprt *ret; 2696 2697 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2698 xprt_max_tcp_slot_table_entries); 2699 if (IS_ERR(xprt)) 2700 return xprt; 2701 transport = container_of(xprt, struct sock_xprt, xprt); 2702 2703 xprt->prot = 0; 2704 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2705 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2706 2707 xprt->bind_timeout = XS_BIND_TO; 2708 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2709 xprt->idle_timeout = XS_IDLE_DISC_TO; 2710 2711 xprt->ops = &xs_local_ops; 2712 xprt->timeout = &xs_local_default_timeout; 2713 2714 INIT_DELAYED_WORK(&transport->connect_worker, 2715 xs_dummy_setup_socket); 2716 2717 switch (sun->sun_family) { 2718 case AF_LOCAL: 2719 if (sun->sun_path[0] != '/') { 2720 dprintk("RPC: bad AF_LOCAL address: %s\n", 2721 sun->sun_path); 2722 ret = ERR_PTR(-EINVAL); 2723 goto out_err; 2724 } 2725 xprt_set_bound(xprt); 2726 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2727 ret = ERR_PTR(xs_local_setup_socket(transport)); 2728 if (ret) 2729 goto out_err; 2730 break; 2731 default: 2732 ret = ERR_PTR(-EAFNOSUPPORT); 2733 goto out_err; 2734 } 2735 2736 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2737 xprt->address_strings[RPC_DISPLAY_ADDR]); 2738 2739 if (try_module_get(THIS_MODULE)) 2740 return xprt; 2741 ret = ERR_PTR(-EINVAL); 2742 out_err: 2743 xprt_free(xprt); 2744 return ret; 2745 } 2746 2747 static const struct rpc_timeout xs_udp_default_timeout = { 2748 .to_initval = 5 * HZ, 2749 .to_maxval = 30 * HZ, 2750 .to_increment = 5 * HZ, 2751 .to_retries = 5, 2752 }; 2753 2754 /** 2755 * xs_setup_udp - Set up transport to use a UDP socket 2756 * @args: rpc transport creation arguments 2757 * 2758 */ 2759 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2760 { 2761 struct sockaddr *addr = args->dstaddr; 2762 struct rpc_xprt *xprt; 2763 struct sock_xprt *transport; 2764 struct rpc_xprt *ret; 2765 2766 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2767 xprt_udp_slot_table_entries); 2768 if (IS_ERR(xprt)) 2769 return xprt; 2770 transport = container_of(xprt, struct sock_xprt, xprt); 2771 2772 xprt->prot = IPPROTO_UDP; 2773 xprt->tsh_size = 0; 2774 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2775 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2776 2777 xprt->bind_timeout = XS_BIND_TO; 2778 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2779 xprt->idle_timeout = XS_IDLE_DISC_TO; 2780 2781 xprt->ops = &xs_udp_ops; 2782 2783 xprt->timeout = &xs_udp_default_timeout; 2784 2785 switch (addr->sa_family) { 2786 case AF_INET: 2787 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2788 xprt_set_bound(xprt); 2789 2790 INIT_DELAYED_WORK(&transport->connect_worker, 2791 xs_udp_setup_socket); 2792 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2793 break; 2794 case AF_INET6: 2795 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2796 xprt_set_bound(xprt); 2797 2798 INIT_DELAYED_WORK(&transport->connect_worker, 2799 xs_udp_setup_socket); 2800 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2801 break; 2802 default: 2803 ret = ERR_PTR(-EAFNOSUPPORT); 2804 goto out_err; 2805 } 2806 2807 if (xprt_bound(xprt)) 2808 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2809 xprt->address_strings[RPC_DISPLAY_ADDR], 2810 xprt->address_strings[RPC_DISPLAY_PORT], 2811 xprt->address_strings[RPC_DISPLAY_PROTO]); 2812 else 2813 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2814 xprt->address_strings[RPC_DISPLAY_ADDR], 2815 xprt->address_strings[RPC_DISPLAY_PROTO]); 2816 2817 if (try_module_get(THIS_MODULE)) 2818 return xprt; 2819 ret = ERR_PTR(-EINVAL); 2820 out_err: 2821 xprt_free(xprt); 2822 return ret; 2823 } 2824 2825 static const struct rpc_timeout xs_tcp_default_timeout = { 2826 .to_initval = 60 * HZ, 2827 .to_maxval = 60 * HZ, 2828 .to_retries = 2, 2829 }; 2830 2831 /** 2832 * xs_setup_tcp - Set up transport to use a TCP socket 2833 * @args: rpc transport creation arguments 2834 * 2835 */ 2836 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2837 { 2838 struct sockaddr *addr = args->dstaddr; 2839 struct rpc_xprt *xprt; 2840 struct sock_xprt *transport; 2841 struct rpc_xprt *ret; 2842 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2843 2844 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2845 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2846 2847 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2848 max_slot_table_size); 2849 if (IS_ERR(xprt)) 2850 return xprt; 2851 transport = container_of(xprt, struct sock_xprt, xprt); 2852 2853 xprt->prot = IPPROTO_TCP; 2854 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2855 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2856 2857 xprt->bind_timeout = XS_BIND_TO; 2858 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2859 xprt->idle_timeout = XS_IDLE_DISC_TO; 2860 2861 xprt->ops = &xs_tcp_ops; 2862 xprt->timeout = &xs_tcp_default_timeout; 2863 2864 switch (addr->sa_family) { 2865 case AF_INET: 2866 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2867 xprt_set_bound(xprt); 2868 2869 INIT_DELAYED_WORK(&transport->connect_worker, 2870 xs_tcp_setup_socket); 2871 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2872 break; 2873 case AF_INET6: 2874 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2875 xprt_set_bound(xprt); 2876 2877 INIT_DELAYED_WORK(&transport->connect_worker, 2878 xs_tcp_setup_socket); 2879 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2880 break; 2881 default: 2882 ret = ERR_PTR(-EAFNOSUPPORT); 2883 goto out_err; 2884 } 2885 2886 if (xprt_bound(xprt)) 2887 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2888 xprt->address_strings[RPC_DISPLAY_ADDR], 2889 xprt->address_strings[RPC_DISPLAY_PORT], 2890 xprt->address_strings[RPC_DISPLAY_PROTO]); 2891 else 2892 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2893 xprt->address_strings[RPC_DISPLAY_ADDR], 2894 xprt->address_strings[RPC_DISPLAY_PROTO]); 2895 2896 2897 if (try_module_get(THIS_MODULE)) 2898 return xprt; 2899 ret = ERR_PTR(-EINVAL); 2900 out_err: 2901 xprt_free(xprt); 2902 return ret; 2903 } 2904 2905 /** 2906 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2907 * @args: rpc transport creation arguments 2908 * 2909 */ 2910 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2911 { 2912 struct sockaddr *addr = args->dstaddr; 2913 struct rpc_xprt *xprt; 2914 struct sock_xprt *transport; 2915 struct svc_sock *bc_sock; 2916 struct rpc_xprt *ret; 2917 2918 if (args->bc_xprt->xpt_bc_xprt) { 2919 /* 2920 * This server connection already has a backchannel 2921 * transport; we can't create a new one, as we wouldn't 2922 * be able to match replies based on xid any more. So, 2923 * reuse the already-existing one: 2924 */ 2925 return args->bc_xprt->xpt_bc_xprt; 2926 } 2927 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2928 xprt_tcp_slot_table_entries); 2929 if (IS_ERR(xprt)) 2930 return xprt; 2931 transport = container_of(xprt, struct sock_xprt, xprt); 2932 2933 xprt->prot = IPPROTO_TCP; 2934 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2935 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2936 xprt->timeout = &xs_tcp_default_timeout; 2937 2938 /* backchannel */ 2939 xprt_set_bound(xprt); 2940 xprt->bind_timeout = 0; 2941 xprt->reestablish_timeout = 0; 2942 xprt->idle_timeout = 0; 2943 2944 xprt->ops = &bc_tcp_ops; 2945 2946 switch (addr->sa_family) { 2947 case AF_INET: 2948 xs_format_peer_addresses(xprt, "tcp", 2949 RPCBIND_NETID_TCP); 2950 break; 2951 case AF_INET6: 2952 xs_format_peer_addresses(xprt, "tcp", 2953 RPCBIND_NETID_TCP6); 2954 break; 2955 default: 2956 ret = ERR_PTR(-EAFNOSUPPORT); 2957 goto out_err; 2958 } 2959 2960 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2961 xprt->address_strings[RPC_DISPLAY_ADDR], 2962 xprt->address_strings[RPC_DISPLAY_PORT], 2963 xprt->address_strings[RPC_DISPLAY_PROTO]); 2964 2965 /* 2966 * Once we've associated a backchannel xprt with a connection, 2967 * we want to keep it around as long as the connection lasts, 2968 * in case we need to start using it for a backchannel again; 2969 * this reference won't be dropped until bc_xprt is destroyed. 2970 */ 2971 xprt_get(xprt); 2972 args->bc_xprt->xpt_bc_xprt = xprt; 2973 xprt->bc_xprt = args->bc_xprt; 2974 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2975 transport->sock = bc_sock->sk_sock; 2976 transport->inet = bc_sock->sk_sk; 2977 2978 /* 2979 * Since we don't want connections for the backchannel, we set 2980 * the xprt status to connected 2981 */ 2982 xprt_set_connected(xprt); 2983 2984 2985 if (try_module_get(THIS_MODULE)) 2986 return xprt; 2987 xprt_put(xprt); 2988 ret = ERR_PTR(-EINVAL); 2989 out_err: 2990 xprt_free(xprt); 2991 return ret; 2992 } 2993 2994 static struct xprt_class xs_local_transport = { 2995 .list = LIST_HEAD_INIT(xs_local_transport.list), 2996 .name = "named UNIX socket", 2997 .owner = THIS_MODULE, 2998 .ident = XPRT_TRANSPORT_LOCAL, 2999 .setup = xs_setup_local, 3000 }; 3001 3002 static struct xprt_class xs_udp_transport = { 3003 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3004 .name = "udp", 3005 .owner = THIS_MODULE, 3006 .ident = XPRT_TRANSPORT_UDP, 3007 .setup = xs_setup_udp, 3008 }; 3009 3010 static struct xprt_class xs_tcp_transport = { 3011 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3012 .name = "tcp", 3013 .owner = THIS_MODULE, 3014 .ident = XPRT_TRANSPORT_TCP, 3015 .setup = xs_setup_tcp, 3016 }; 3017 3018 static struct xprt_class xs_bc_tcp_transport = { 3019 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3020 .name = "tcp NFSv4.1 backchannel", 3021 .owner = THIS_MODULE, 3022 .ident = XPRT_TRANSPORT_BC_TCP, 3023 .setup = xs_setup_bc_tcp, 3024 }; 3025 3026 /** 3027 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3028 * 3029 */ 3030 int init_socket_xprt(void) 3031 { 3032 #ifdef RPC_DEBUG 3033 if (!sunrpc_table_header) 3034 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3035 #endif 3036 3037 xprt_register_transport(&xs_local_transport); 3038 xprt_register_transport(&xs_udp_transport); 3039 xprt_register_transport(&xs_tcp_transport); 3040 xprt_register_transport(&xs_bc_tcp_transport); 3041 3042 return 0; 3043 } 3044 3045 /** 3046 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3047 * 3048 */ 3049 void cleanup_socket_xprt(void) 3050 { 3051 #ifdef RPC_DEBUG 3052 if (sunrpc_table_header) { 3053 unregister_sysctl_table(sunrpc_table_header); 3054 sunrpc_table_header = NULL; 3055 } 3056 #endif 3057 3058 xprt_unregister_transport(&xs_local_transport); 3059 xprt_unregister_transport(&xs_udp_transport); 3060 xprt_unregister_transport(&xs_tcp_transport); 3061 xprt_unregister_transport(&xs_bc_tcp_transport); 3062 } 3063 3064 static int param_set_uint_minmax(const char *val, 3065 const struct kernel_param *kp, 3066 unsigned int min, unsigned int max) 3067 { 3068 unsigned long num; 3069 int ret; 3070 3071 if (!val) 3072 return -EINVAL; 3073 ret = strict_strtoul(val, 0, &num); 3074 if (ret == -EINVAL || num < min || num > max) 3075 return -EINVAL; 3076 *((unsigned int *)kp->arg) = num; 3077 return 0; 3078 } 3079 3080 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3081 { 3082 return param_set_uint_minmax(val, kp, 3083 RPC_MIN_RESVPORT, 3084 RPC_MAX_RESVPORT); 3085 } 3086 3087 static struct kernel_param_ops param_ops_portnr = { 3088 .set = param_set_portnr, 3089 .get = param_get_uint, 3090 }; 3091 3092 #define param_check_portnr(name, p) \ 3093 __param_check(name, p, unsigned int); 3094 3095 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3096 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3097 3098 static int param_set_slot_table_size(const char *val, 3099 const struct kernel_param *kp) 3100 { 3101 return param_set_uint_minmax(val, kp, 3102 RPC_MIN_SLOT_TABLE, 3103 RPC_MAX_SLOT_TABLE); 3104 } 3105 3106 static struct kernel_param_ops param_ops_slot_table_size = { 3107 .set = param_set_slot_table_size, 3108 .get = param_get_uint, 3109 }; 3110 3111 #define param_check_slot_table_size(name, p) \ 3112 __param_check(name, p, unsigned int); 3113 3114 static int param_set_max_slot_table_size(const char *val, 3115 const struct kernel_param *kp) 3116 { 3117 return param_set_uint_minmax(val, kp, 3118 RPC_MIN_SLOT_TABLE, 3119 RPC_MAX_SLOT_TABLE_LIMIT); 3120 } 3121 3122 static struct kernel_param_ops param_ops_max_slot_table_size = { 3123 .set = param_set_max_slot_table_size, 3124 .get = param_get_uint, 3125 }; 3126 3127 #define param_check_max_slot_table_size(name, p) \ 3128 __param_check(name, p, unsigned int); 3129 3130 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3131 slot_table_size, 0644); 3132 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3133 max_slot_table_size, 0644); 3134 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3135 slot_table_size, 0644); 3136 3137