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 struct sock *sk = transport->inet; 514 int ret = -EAGAIN; 515 516 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 517 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 518 req->rq_slen); 519 520 /* Protect against races with write_space */ 521 spin_lock_bh(&xprt->transport_lock); 522 523 /* Don't race with disconnect */ 524 if (xprt_connected(xprt)) { 525 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 526 /* 527 * Notify TCP that we're limited by the application 528 * window size 529 */ 530 set_bit(SOCK_NOSPACE, &transport->sock->flags); 531 sk->sk_write_pending++; 532 /* ...and wait for more buffer space */ 533 xprt_wait_for_buffer_space(task, xs_nospace_callback); 534 } 535 } else { 536 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 537 ret = -ENOTCONN; 538 } 539 540 spin_unlock_bh(&xprt->transport_lock); 541 542 /* Race breaker in case memory is freed before above code is called */ 543 sk->sk_write_space(sk); 544 return ret; 545 } 546 547 /* 548 * Construct a stream transport record marker in @buf. 549 */ 550 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 551 { 552 u32 reclen = buf->len - sizeof(rpc_fraghdr); 553 rpc_fraghdr *base = buf->head[0].iov_base; 554 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 555 } 556 557 /** 558 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 559 * @task: RPC task that manages the state of an RPC request 560 * 561 * Return values: 562 * 0: The request has been sent 563 * EAGAIN: The socket was blocked, please call again later to 564 * complete the request 565 * ENOTCONN: Caller needs to invoke connect logic then call again 566 * other: Some other error occured, the request was not sent 567 */ 568 static int xs_local_send_request(struct rpc_task *task) 569 { 570 struct rpc_rqst *req = task->tk_rqstp; 571 struct rpc_xprt *xprt = req->rq_xprt; 572 struct sock_xprt *transport = 573 container_of(xprt, struct sock_xprt, xprt); 574 struct xdr_buf *xdr = &req->rq_snd_buf; 575 int status; 576 577 xs_encode_stream_record_marker(&req->rq_snd_buf); 578 579 xs_pktdump("packet data:", 580 req->rq_svec->iov_base, req->rq_svec->iov_len); 581 582 status = xs_sendpages(transport->sock, NULL, 0, 583 xdr, req->rq_bytes_sent, true); 584 dprintk("RPC: %s(%u) = %d\n", 585 __func__, xdr->len - req->rq_bytes_sent, status); 586 if (likely(status >= 0)) { 587 req->rq_bytes_sent += status; 588 req->rq_xmit_bytes_sent += status; 589 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 590 req->rq_bytes_sent = 0; 591 return 0; 592 } 593 status = -EAGAIN; 594 } 595 596 switch (status) { 597 case -EAGAIN: 598 status = xs_nospace(task); 599 break; 600 default: 601 dprintk("RPC: sendmsg returned unrecognized error %d\n", 602 -status); 603 case -EPIPE: 604 xs_close(xprt); 605 status = -ENOTCONN; 606 } 607 608 return status; 609 } 610 611 /** 612 * xs_udp_send_request - write an RPC request to a UDP socket 613 * @task: address of RPC task that manages the state of an RPC request 614 * 615 * Return values: 616 * 0: The request has been sent 617 * EAGAIN: The socket was blocked, please call again later to 618 * complete the request 619 * ENOTCONN: Caller needs to invoke connect logic then call again 620 * other: Some other error occurred, the request was not sent 621 */ 622 static int xs_udp_send_request(struct rpc_task *task) 623 { 624 struct rpc_rqst *req = task->tk_rqstp; 625 struct rpc_xprt *xprt = req->rq_xprt; 626 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 627 struct xdr_buf *xdr = &req->rq_snd_buf; 628 int status; 629 630 xs_pktdump("packet data:", 631 req->rq_svec->iov_base, 632 req->rq_svec->iov_len); 633 634 if (!xprt_bound(xprt)) 635 return -ENOTCONN; 636 status = xs_sendpages(transport->sock, 637 xs_addr(xprt), 638 xprt->addrlen, xdr, 639 req->rq_bytes_sent, true); 640 641 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 642 xdr->len - req->rq_bytes_sent, status); 643 644 if (status >= 0) { 645 req->rq_xmit_bytes_sent += status; 646 if (status >= req->rq_slen) 647 return 0; 648 /* Still some bytes left; set up for a retry later. */ 649 status = -EAGAIN; 650 } 651 652 switch (status) { 653 case -ENOTSOCK: 654 status = -ENOTCONN; 655 /* Should we call xs_close() here? */ 656 break; 657 case -EAGAIN: 658 status = xs_nospace(task); 659 break; 660 default: 661 dprintk("RPC: sendmsg returned unrecognized error %d\n", 662 -status); 663 case -ENETUNREACH: 664 case -EPIPE: 665 case -ECONNREFUSED: 666 /* When the server has died, an ICMP port unreachable message 667 * prompts ECONNREFUSED. */ 668 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 669 } 670 671 return status; 672 } 673 674 /** 675 * xs_tcp_shutdown - gracefully shut down a TCP socket 676 * @xprt: transport 677 * 678 * Initiates a graceful shutdown of the TCP socket by calling the 679 * equivalent of shutdown(SHUT_WR); 680 */ 681 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 682 { 683 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 684 struct socket *sock = transport->sock; 685 686 if (sock != NULL) { 687 kernel_sock_shutdown(sock, SHUT_WR); 688 trace_rpc_socket_shutdown(xprt, sock); 689 } 690 } 691 692 /** 693 * xs_tcp_send_request - write an RPC request to a TCP socket 694 * @task: address of RPC task that manages the state of an RPC request 695 * 696 * Return values: 697 * 0: The request has been sent 698 * EAGAIN: The socket was blocked, please call again later to 699 * complete the request 700 * ENOTCONN: Caller needs to invoke connect logic then call again 701 * other: Some other error occurred, the request was not sent 702 * 703 * XXX: In the case of soft timeouts, should we eventually give up 704 * if sendmsg is not able to make progress? 705 */ 706 static int xs_tcp_send_request(struct rpc_task *task) 707 { 708 struct rpc_rqst *req = task->tk_rqstp; 709 struct rpc_xprt *xprt = req->rq_xprt; 710 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 711 struct xdr_buf *xdr = &req->rq_snd_buf; 712 bool zerocopy = true; 713 int status; 714 715 xs_encode_stream_record_marker(&req->rq_snd_buf); 716 717 xs_pktdump("packet data:", 718 req->rq_svec->iov_base, 719 req->rq_svec->iov_len); 720 /* Don't use zero copy if this is a resend. If the RPC call 721 * completes while the socket holds a reference to the pages, 722 * then we may end up resending corrupted data. 723 */ 724 if (task->tk_flags & RPC_TASK_SENT) 725 zerocopy = false; 726 727 /* Continue transmitting the packet/record. We must be careful 728 * to cope with writespace callbacks arriving _after_ we have 729 * called sendmsg(). */ 730 while (1) { 731 status = xs_sendpages(transport->sock, 732 NULL, 0, xdr, req->rq_bytes_sent, 733 zerocopy); 734 735 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 736 xdr->len - req->rq_bytes_sent, status); 737 738 if (unlikely(status < 0)) 739 break; 740 741 /* If we've sent the entire packet, immediately 742 * reset the count of bytes sent. */ 743 req->rq_bytes_sent += status; 744 req->rq_xmit_bytes_sent += status; 745 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 746 req->rq_bytes_sent = 0; 747 return 0; 748 } 749 750 if (status != 0) 751 continue; 752 status = -EAGAIN; 753 break; 754 } 755 756 switch (status) { 757 case -ENOTSOCK: 758 status = -ENOTCONN; 759 /* Should we call xs_close() here? */ 760 break; 761 case -EAGAIN: 762 status = xs_nospace(task); 763 break; 764 default: 765 dprintk("RPC: sendmsg returned unrecognized error %d\n", 766 -status); 767 case -ECONNRESET: 768 xs_tcp_shutdown(xprt); 769 case -ECONNREFUSED: 770 case -ENOTCONN: 771 case -EPIPE: 772 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 773 } 774 775 return status; 776 } 777 778 /** 779 * xs_tcp_release_xprt - clean up after a tcp transmission 780 * @xprt: transport 781 * @task: rpc task 782 * 783 * This cleans up if an error causes us to abort the transmission of a request. 784 * In this case, the socket may need to be reset in order to avoid confusing 785 * the server. 786 */ 787 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 788 { 789 struct rpc_rqst *req; 790 791 if (task != xprt->snd_task) 792 return; 793 if (task == NULL) 794 goto out_release; 795 req = task->tk_rqstp; 796 if (req == NULL) 797 goto out_release; 798 if (req->rq_bytes_sent == 0) 799 goto out_release; 800 if (req->rq_bytes_sent == req->rq_snd_buf.len) 801 goto out_release; 802 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 803 out_release: 804 xprt_release_xprt(xprt, task); 805 } 806 807 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 808 { 809 transport->old_data_ready = sk->sk_data_ready; 810 transport->old_state_change = sk->sk_state_change; 811 transport->old_write_space = sk->sk_write_space; 812 transport->old_error_report = sk->sk_error_report; 813 } 814 815 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 816 { 817 sk->sk_data_ready = transport->old_data_ready; 818 sk->sk_state_change = transport->old_state_change; 819 sk->sk_write_space = transport->old_write_space; 820 sk->sk_error_report = transport->old_error_report; 821 } 822 823 /** 824 * xs_error_report - callback to handle TCP socket state errors 825 * @sk: socket 826 * 827 * Note: we don't call sock_error() since there may be a rpc_task 828 * using the socket, and so we don't want to clear sk->sk_err. 829 */ 830 static void xs_error_report(struct sock *sk) 831 { 832 struct rpc_xprt *xprt; 833 int err; 834 835 read_lock_bh(&sk->sk_callback_lock); 836 if (!(xprt = xprt_from_sock(sk))) 837 goto out; 838 839 err = -sk->sk_err; 840 if (err == 0) 841 goto out; 842 dprintk("RPC: xs_error_report client %p, error=%d...\n", 843 xprt, -err); 844 trace_rpc_socket_error(xprt, sk->sk_socket, err); 845 xprt_wake_pending_tasks(xprt, err); 846 out: 847 read_unlock_bh(&sk->sk_callback_lock); 848 } 849 850 static void xs_reset_transport(struct sock_xprt *transport) 851 { 852 struct socket *sock = transport->sock; 853 struct sock *sk = transport->inet; 854 855 if (sk == NULL) 856 return; 857 858 transport->srcport = 0; 859 860 write_lock_bh(&sk->sk_callback_lock); 861 transport->inet = NULL; 862 transport->sock = NULL; 863 864 sk->sk_user_data = NULL; 865 866 xs_restore_old_callbacks(transport, sk); 867 write_unlock_bh(&sk->sk_callback_lock); 868 869 sk->sk_no_check = 0; 870 871 trace_rpc_socket_close(&transport->xprt, sock); 872 sock_release(sock); 873 } 874 875 /** 876 * xs_close - close a socket 877 * @xprt: transport 878 * 879 * This is used when all requests are complete; ie, no DRC state remains 880 * on the server we want to save. 881 * 882 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 883 * xs_reset_transport() zeroing the socket from underneath a writer. 884 */ 885 static void xs_close(struct rpc_xprt *xprt) 886 { 887 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 888 889 dprintk("RPC: xs_close xprt %p\n", xprt); 890 891 cancel_delayed_work_sync(&transport->connect_worker); 892 893 xs_reset_transport(transport); 894 xprt->reestablish_timeout = 0; 895 896 smp_mb__before_clear_bit(); 897 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 898 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 899 clear_bit(XPRT_CLOSING, &xprt->state); 900 smp_mb__after_clear_bit(); 901 xprt_disconnect_done(xprt); 902 } 903 904 static void xs_tcp_close(struct rpc_xprt *xprt) 905 { 906 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 907 xs_close(xprt); 908 else 909 xs_tcp_shutdown(xprt); 910 } 911 912 /** 913 * xs_destroy - prepare to shutdown a transport 914 * @xprt: doomed transport 915 * 916 */ 917 static void xs_destroy(struct rpc_xprt *xprt) 918 { 919 dprintk("RPC: xs_destroy xprt %p\n", xprt); 920 921 xs_close(xprt); 922 xs_free_peer_addresses(xprt); 923 xprt_free(xprt); 924 module_put(THIS_MODULE); 925 } 926 927 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 928 { 929 struct xdr_skb_reader desc = { 930 .skb = skb, 931 .offset = sizeof(rpc_fraghdr), 932 .count = skb->len - sizeof(rpc_fraghdr), 933 }; 934 935 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 936 return -1; 937 if (desc.count) 938 return -1; 939 return 0; 940 } 941 942 /** 943 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 944 * @sk: socket with data to read 945 * @len: how much data to read 946 * 947 * Currently this assumes we can read the whole reply in a single gulp. 948 */ 949 static void xs_local_data_ready(struct sock *sk, int len) 950 { 951 struct rpc_task *task; 952 struct rpc_xprt *xprt; 953 struct rpc_rqst *rovr; 954 struct sk_buff *skb; 955 int err, repsize, copied; 956 u32 _xid; 957 __be32 *xp; 958 959 read_lock_bh(&sk->sk_callback_lock); 960 dprintk("RPC: %s...\n", __func__); 961 xprt = xprt_from_sock(sk); 962 if (xprt == NULL) 963 goto out; 964 965 skb = skb_recv_datagram(sk, 0, 1, &err); 966 if (skb == NULL) 967 goto out; 968 969 repsize = skb->len - sizeof(rpc_fraghdr); 970 if (repsize < 4) { 971 dprintk("RPC: impossible RPC reply size %d\n", repsize); 972 goto dropit; 973 } 974 975 /* Copy the XID from the skb... */ 976 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 977 if (xp == NULL) 978 goto dropit; 979 980 /* Look up and lock the request corresponding to the given XID */ 981 spin_lock(&xprt->transport_lock); 982 rovr = xprt_lookup_rqst(xprt, *xp); 983 if (!rovr) 984 goto out_unlock; 985 task = rovr->rq_task; 986 987 copied = rovr->rq_private_buf.buflen; 988 if (copied > repsize) 989 copied = repsize; 990 991 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 992 dprintk("RPC: sk_buff copy failed\n"); 993 goto out_unlock; 994 } 995 996 xprt_complete_rqst(task, copied); 997 998 out_unlock: 999 spin_unlock(&xprt->transport_lock); 1000 dropit: 1001 skb_free_datagram(sk, skb); 1002 out: 1003 read_unlock_bh(&sk->sk_callback_lock); 1004 } 1005 1006 /** 1007 * xs_udp_data_ready - "data ready" callback for UDP sockets 1008 * @sk: socket with data to read 1009 * @len: how much data to read 1010 * 1011 */ 1012 static void xs_udp_data_ready(struct sock *sk, int len) 1013 { 1014 struct rpc_task *task; 1015 struct rpc_xprt *xprt; 1016 struct rpc_rqst *rovr; 1017 struct sk_buff *skb; 1018 int err, repsize, copied; 1019 u32 _xid; 1020 __be32 *xp; 1021 1022 read_lock_bh(&sk->sk_callback_lock); 1023 dprintk("RPC: xs_udp_data_ready...\n"); 1024 if (!(xprt = xprt_from_sock(sk))) 1025 goto out; 1026 1027 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 1028 goto out; 1029 1030 repsize = skb->len - sizeof(struct udphdr); 1031 if (repsize < 4) { 1032 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1033 goto dropit; 1034 } 1035 1036 /* Copy the XID from the skb... */ 1037 xp = skb_header_pointer(skb, sizeof(struct udphdr), 1038 sizeof(_xid), &_xid); 1039 if (xp == NULL) 1040 goto dropit; 1041 1042 /* Look up and lock the request corresponding to the given XID */ 1043 spin_lock(&xprt->transport_lock); 1044 rovr = xprt_lookup_rqst(xprt, *xp); 1045 if (!rovr) 1046 goto out_unlock; 1047 task = rovr->rq_task; 1048 1049 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1050 copied = repsize; 1051 1052 /* Suck it into the iovec, verify checksum if not done by hw. */ 1053 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1054 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1055 goto out_unlock; 1056 } 1057 1058 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1059 1060 xprt_adjust_cwnd(xprt, task, copied); 1061 xprt_complete_rqst(task, copied); 1062 1063 out_unlock: 1064 spin_unlock(&xprt->transport_lock); 1065 dropit: 1066 skb_free_datagram(sk, skb); 1067 out: 1068 read_unlock_bh(&sk->sk_callback_lock); 1069 } 1070 1071 /* 1072 * Helper function to force a TCP close if the server is sending 1073 * junk and/or it has put us in CLOSE_WAIT 1074 */ 1075 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1076 { 1077 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1078 xprt_force_disconnect(xprt); 1079 } 1080 1081 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1082 { 1083 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1084 size_t len, used; 1085 char *p; 1086 1087 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1088 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1089 used = xdr_skb_read_bits(desc, p, len); 1090 transport->tcp_offset += used; 1091 if (used != len) 1092 return; 1093 1094 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1095 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1096 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1097 else 1098 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1099 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1100 1101 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1102 transport->tcp_offset = 0; 1103 1104 /* Sanity check of the record length */ 1105 if (unlikely(transport->tcp_reclen < 8)) { 1106 dprintk("RPC: invalid TCP record fragment length\n"); 1107 xs_tcp_force_close(xprt); 1108 return; 1109 } 1110 dprintk("RPC: reading TCP record fragment of length %d\n", 1111 transport->tcp_reclen); 1112 } 1113 1114 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1115 { 1116 if (transport->tcp_offset == transport->tcp_reclen) { 1117 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1118 transport->tcp_offset = 0; 1119 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1120 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1121 transport->tcp_flags |= TCP_RCV_COPY_XID; 1122 transport->tcp_copied = 0; 1123 } 1124 } 1125 } 1126 1127 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1128 { 1129 size_t len, used; 1130 char *p; 1131 1132 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1133 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1134 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1135 used = xdr_skb_read_bits(desc, p, len); 1136 transport->tcp_offset += used; 1137 if (used != len) 1138 return; 1139 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1140 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1141 transport->tcp_copied = 4; 1142 dprintk("RPC: reading %s XID %08x\n", 1143 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1144 : "request with", 1145 ntohl(transport->tcp_xid)); 1146 xs_tcp_check_fraghdr(transport); 1147 } 1148 1149 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1150 struct xdr_skb_reader *desc) 1151 { 1152 size_t len, used; 1153 u32 offset; 1154 char *p; 1155 1156 /* 1157 * We want transport->tcp_offset to be 8 at the end of this routine 1158 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1159 * When this function is called for the first time, 1160 * transport->tcp_offset is 4 (after having already read the xid). 1161 */ 1162 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1163 len = sizeof(transport->tcp_calldir) - offset; 1164 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1165 p = ((char *) &transport->tcp_calldir) + offset; 1166 used = xdr_skb_read_bits(desc, p, len); 1167 transport->tcp_offset += used; 1168 if (used != len) 1169 return; 1170 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1171 /* 1172 * We don't yet have the XDR buffer, so we will write the calldir 1173 * out after we get the buffer from the 'struct rpc_rqst' 1174 */ 1175 switch (ntohl(transport->tcp_calldir)) { 1176 case RPC_REPLY: 1177 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1178 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1179 transport->tcp_flags |= TCP_RPC_REPLY; 1180 break; 1181 case RPC_CALL: 1182 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1183 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1184 transport->tcp_flags &= ~TCP_RPC_REPLY; 1185 break; 1186 default: 1187 dprintk("RPC: invalid request message type\n"); 1188 xs_tcp_force_close(&transport->xprt); 1189 } 1190 xs_tcp_check_fraghdr(transport); 1191 } 1192 1193 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1194 struct xdr_skb_reader *desc, 1195 struct rpc_rqst *req) 1196 { 1197 struct sock_xprt *transport = 1198 container_of(xprt, struct sock_xprt, xprt); 1199 struct xdr_buf *rcvbuf; 1200 size_t len; 1201 ssize_t r; 1202 1203 rcvbuf = &req->rq_private_buf; 1204 1205 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1206 /* 1207 * Save the RPC direction in the XDR buffer 1208 */ 1209 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1210 &transport->tcp_calldir, 1211 sizeof(transport->tcp_calldir)); 1212 transport->tcp_copied += sizeof(transport->tcp_calldir); 1213 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1214 } 1215 1216 len = desc->count; 1217 if (len > transport->tcp_reclen - transport->tcp_offset) { 1218 struct xdr_skb_reader my_desc; 1219 1220 len = transport->tcp_reclen - transport->tcp_offset; 1221 memcpy(&my_desc, desc, sizeof(my_desc)); 1222 my_desc.count = len; 1223 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1224 &my_desc, xdr_skb_read_bits); 1225 desc->count -= r; 1226 desc->offset += r; 1227 } else 1228 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1229 desc, xdr_skb_read_bits); 1230 1231 if (r > 0) { 1232 transport->tcp_copied += r; 1233 transport->tcp_offset += r; 1234 } 1235 if (r != len) { 1236 /* Error when copying to the receive buffer, 1237 * usually because we weren't able to allocate 1238 * additional buffer pages. All we can do now 1239 * is turn off TCP_RCV_COPY_DATA, so the request 1240 * will not receive any additional updates, 1241 * and time out. 1242 * Any remaining data from this record will 1243 * be discarded. 1244 */ 1245 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1246 dprintk("RPC: XID %08x truncated request\n", 1247 ntohl(transport->tcp_xid)); 1248 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1249 "tcp_offset = %u, tcp_reclen = %u\n", 1250 xprt, transport->tcp_copied, 1251 transport->tcp_offset, transport->tcp_reclen); 1252 return; 1253 } 1254 1255 dprintk("RPC: XID %08x read %Zd bytes\n", 1256 ntohl(transport->tcp_xid), r); 1257 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1258 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1259 transport->tcp_offset, transport->tcp_reclen); 1260 1261 if (transport->tcp_copied == req->rq_private_buf.buflen) 1262 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1263 else if (transport->tcp_offset == transport->tcp_reclen) { 1264 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1265 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1266 } 1267 } 1268 1269 /* 1270 * Finds the request corresponding to the RPC xid and invokes the common 1271 * tcp read code to read the data. 1272 */ 1273 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1274 struct xdr_skb_reader *desc) 1275 { 1276 struct sock_xprt *transport = 1277 container_of(xprt, struct sock_xprt, xprt); 1278 struct rpc_rqst *req; 1279 1280 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1281 1282 /* Find and lock the request corresponding to this xid */ 1283 spin_lock(&xprt->transport_lock); 1284 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1285 if (!req) { 1286 dprintk("RPC: XID %08x request not found!\n", 1287 ntohl(transport->tcp_xid)); 1288 spin_unlock(&xprt->transport_lock); 1289 return -1; 1290 } 1291 1292 xs_tcp_read_common(xprt, desc, req); 1293 1294 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1295 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1296 1297 spin_unlock(&xprt->transport_lock); 1298 return 0; 1299 } 1300 1301 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1302 /* 1303 * Obtains an rpc_rqst previously allocated and invokes the common 1304 * tcp read code to read the data. The result is placed in the callback 1305 * queue. 1306 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1307 * connection and return -1. 1308 */ 1309 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1310 struct xdr_skb_reader *desc) 1311 { 1312 struct sock_xprt *transport = 1313 container_of(xprt, struct sock_xprt, xprt); 1314 struct rpc_rqst *req; 1315 1316 req = xprt_alloc_bc_request(xprt); 1317 if (req == NULL) { 1318 printk(KERN_WARNING "Callback slot table overflowed\n"); 1319 xprt_force_disconnect(xprt); 1320 return -1; 1321 } 1322 1323 req->rq_xid = transport->tcp_xid; 1324 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1325 xs_tcp_read_common(xprt, desc, req); 1326 1327 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1328 struct svc_serv *bc_serv = xprt->bc_serv; 1329 1330 /* 1331 * Add callback request to callback list. The callback 1332 * service sleeps on the sv_cb_waitq waiting for new 1333 * requests. Wake it up after adding enqueing the 1334 * request. 1335 */ 1336 dprintk("RPC: add callback request to list\n"); 1337 spin_lock(&bc_serv->sv_cb_lock); 1338 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1339 spin_unlock(&bc_serv->sv_cb_lock); 1340 wake_up(&bc_serv->sv_cb_waitq); 1341 } 1342 1343 req->rq_private_buf.len = transport->tcp_copied; 1344 1345 return 0; 1346 } 1347 1348 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1349 struct xdr_skb_reader *desc) 1350 { 1351 struct sock_xprt *transport = 1352 container_of(xprt, struct sock_xprt, xprt); 1353 1354 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1355 xs_tcp_read_reply(xprt, desc) : 1356 xs_tcp_read_callback(xprt, desc); 1357 } 1358 #else 1359 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1360 struct xdr_skb_reader *desc) 1361 { 1362 return xs_tcp_read_reply(xprt, desc); 1363 } 1364 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1365 1366 /* 1367 * Read data off the transport. This can be either an RPC_CALL or an 1368 * RPC_REPLY. Relay the processing to helper functions. 1369 */ 1370 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1371 struct xdr_skb_reader *desc) 1372 { 1373 struct sock_xprt *transport = 1374 container_of(xprt, struct sock_xprt, xprt); 1375 1376 if (_xs_tcp_read_data(xprt, desc) == 0) 1377 xs_tcp_check_fraghdr(transport); 1378 else { 1379 /* 1380 * The transport_lock protects the request handling. 1381 * There's no need to hold it to update the tcp_flags. 1382 */ 1383 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1384 } 1385 } 1386 1387 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1388 { 1389 size_t len; 1390 1391 len = transport->tcp_reclen - transport->tcp_offset; 1392 if (len > desc->count) 1393 len = desc->count; 1394 desc->count -= len; 1395 desc->offset += len; 1396 transport->tcp_offset += len; 1397 dprintk("RPC: discarded %Zu bytes\n", len); 1398 xs_tcp_check_fraghdr(transport); 1399 } 1400 1401 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1402 { 1403 struct rpc_xprt *xprt = rd_desc->arg.data; 1404 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1405 struct xdr_skb_reader desc = { 1406 .skb = skb, 1407 .offset = offset, 1408 .count = len, 1409 }; 1410 1411 dprintk("RPC: xs_tcp_data_recv started\n"); 1412 do { 1413 /* Read in a new fragment marker if necessary */ 1414 /* Can we ever really expect to get completely empty fragments? */ 1415 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1416 xs_tcp_read_fraghdr(xprt, &desc); 1417 continue; 1418 } 1419 /* Read in the xid if necessary */ 1420 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1421 xs_tcp_read_xid(transport, &desc); 1422 continue; 1423 } 1424 /* Read in the call/reply flag */ 1425 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1426 xs_tcp_read_calldir(transport, &desc); 1427 continue; 1428 } 1429 /* Read in the request data */ 1430 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1431 xs_tcp_read_data(xprt, &desc); 1432 continue; 1433 } 1434 /* Skip over any trailing bytes on short reads */ 1435 xs_tcp_read_discard(transport, &desc); 1436 } while (desc.count); 1437 dprintk("RPC: xs_tcp_data_recv done\n"); 1438 return len - desc.count; 1439 } 1440 1441 /** 1442 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1443 * @sk: socket with data to read 1444 * @bytes: how much data to read 1445 * 1446 */ 1447 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1448 { 1449 struct rpc_xprt *xprt; 1450 read_descriptor_t rd_desc; 1451 int read; 1452 1453 dprintk("RPC: xs_tcp_data_ready...\n"); 1454 1455 read_lock_bh(&sk->sk_callback_lock); 1456 if (!(xprt = xprt_from_sock(sk))) 1457 goto out; 1458 /* Any data means we had a useful conversation, so 1459 * the we don't need to delay the next reconnect 1460 */ 1461 if (xprt->reestablish_timeout) 1462 xprt->reestablish_timeout = 0; 1463 1464 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1465 rd_desc.arg.data = xprt; 1466 do { 1467 rd_desc.count = 65536; 1468 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1469 } while (read > 0); 1470 out: 1471 read_unlock_bh(&sk->sk_callback_lock); 1472 } 1473 1474 /* 1475 * Do the equivalent of linger/linger2 handling for dealing with 1476 * broken servers that don't close the socket in a timely 1477 * fashion 1478 */ 1479 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1480 unsigned long timeout) 1481 { 1482 struct sock_xprt *transport; 1483 1484 if (xprt_test_and_set_connecting(xprt)) 1485 return; 1486 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1487 transport = container_of(xprt, struct sock_xprt, xprt); 1488 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1489 timeout); 1490 } 1491 1492 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1493 { 1494 struct sock_xprt *transport; 1495 1496 transport = container_of(xprt, struct sock_xprt, xprt); 1497 1498 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1499 !cancel_delayed_work(&transport->connect_worker)) 1500 return; 1501 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1502 xprt_clear_connecting(xprt); 1503 } 1504 1505 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1506 { 1507 smp_mb__before_clear_bit(); 1508 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1509 clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1510 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1511 clear_bit(XPRT_CLOSING, &xprt->state); 1512 smp_mb__after_clear_bit(); 1513 } 1514 1515 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1516 { 1517 xs_sock_reset_connection_flags(xprt); 1518 /* Mark transport as closed and wake up all pending tasks */ 1519 xprt_disconnect_done(xprt); 1520 } 1521 1522 /** 1523 * xs_tcp_state_change - callback to handle TCP socket state changes 1524 * @sk: socket whose state has changed 1525 * 1526 */ 1527 static void xs_tcp_state_change(struct sock *sk) 1528 { 1529 struct rpc_xprt *xprt; 1530 1531 read_lock_bh(&sk->sk_callback_lock); 1532 if (!(xprt = xprt_from_sock(sk))) 1533 goto out; 1534 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1535 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1536 sk->sk_state, xprt_connected(xprt), 1537 sock_flag(sk, SOCK_DEAD), 1538 sock_flag(sk, SOCK_ZAPPED), 1539 sk->sk_shutdown); 1540 1541 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1542 switch (sk->sk_state) { 1543 case TCP_ESTABLISHED: 1544 spin_lock(&xprt->transport_lock); 1545 if (!xprt_test_and_set_connected(xprt)) { 1546 struct sock_xprt *transport = container_of(xprt, 1547 struct sock_xprt, xprt); 1548 1549 /* Reset TCP record info */ 1550 transport->tcp_offset = 0; 1551 transport->tcp_reclen = 0; 1552 transport->tcp_copied = 0; 1553 transport->tcp_flags = 1554 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1555 xprt->connect_cookie++; 1556 1557 xprt_wake_pending_tasks(xprt, -EAGAIN); 1558 } 1559 spin_unlock(&xprt->transport_lock); 1560 break; 1561 case TCP_FIN_WAIT1: 1562 /* The client initiated a shutdown of the socket */ 1563 xprt->connect_cookie++; 1564 xprt->reestablish_timeout = 0; 1565 set_bit(XPRT_CLOSING, &xprt->state); 1566 smp_mb__before_clear_bit(); 1567 clear_bit(XPRT_CONNECTED, &xprt->state); 1568 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1569 smp_mb__after_clear_bit(); 1570 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1571 break; 1572 case TCP_CLOSE_WAIT: 1573 /* The server initiated a shutdown of the socket */ 1574 xprt->connect_cookie++; 1575 clear_bit(XPRT_CONNECTED, &xprt->state); 1576 xs_tcp_force_close(xprt); 1577 case TCP_CLOSING: 1578 /* 1579 * If the server closed down the connection, make sure that 1580 * we back off before reconnecting 1581 */ 1582 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1583 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1584 break; 1585 case TCP_LAST_ACK: 1586 set_bit(XPRT_CLOSING, &xprt->state); 1587 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1588 smp_mb__before_clear_bit(); 1589 clear_bit(XPRT_CONNECTED, &xprt->state); 1590 smp_mb__after_clear_bit(); 1591 break; 1592 case TCP_CLOSE: 1593 xs_tcp_cancel_linger_timeout(xprt); 1594 xs_sock_mark_closed(xprt); 1595 } 1596 out: 1597 read_unlock_bh(&sk->sk_callback_lock); 1598 } 1599 1600 static void xs_write_space(struct sock *sk) 1601 { 1602 struct socket *sock; 1603 struct rpc_xprt *xprt; 1604 1605 if (unlikely(!(sock = sk->sk_socket))) 1606 return; 1607 clear_bit(SOCK_NOSPACE, &sock->flags); 1608 1609 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1610 return; 1611 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1612 return; 1613 1614 xprt_write_space(xprt); 1615 } 1616 1617 /** 1618 * xs_udp_write_space - callback invoked when socket buffer space 1619 * becomes available 1620 * @sk: socket whose state has changed 1621 * 1622 * Called when more output buffer space is available for this socket. 1623 * We try not to wake our writers until they can make "significant" 1624 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1625 * with a bunch of small requests. 1626 */ 1627 static void xs_udp_write_space(struct sock *sk) 1628 { 1629 read_lock_bh(&sk->sk_callback_lock); 1630 1631 /* from net/core/sock.c:sock_def_write_space */ 1632 if (sock_writeable(sk)) 1633 xs_write_space(sk); 1634 1635 read_unlock_bh(&sk->sk_callback_lock); 1636 } 1637 1638 /** 1639 * xs_tcp_write_space - callback invoked when socket buffer space 1640 * becomes available 1641 * @sk: socket whose state has changed 1642 * 1643 * Called when more output buffer space is available for this socket. 1644 * We try not to wake our writers until they can make "significant" 1645 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1646 * with a bunch of small requests. 1647 */ 1648 static void xs_tcp_write_space(struct sock *sk) 1649 { 1650 read_lock_bh(&sk->sk_callback_lock); 1651 1652 /* from net/core/stream.c:sk_stream_write_space */ 1653 if (sk_stream_is_writeable(sk)) 1654 xs_write_space(sk); 1655 1656 read_unlock_bh(&sk->sk_callback_lock); 1657 } 1658 1659 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1660 { 1661 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1662 struct sock *sk = transport->inet; 1663 1664 if (transport->rcvsize) { 1665 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1666 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1667 } 1668 if (transport->sndsize) { 1669 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1670 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1671 sk->sk_write_space(sk); 1672 } 1673 } 1674 1675 /** 1676 * xs_udp_set_buffer_size - set send and receive limits 1677 * @xprt: generic transport 1678 * @sndsize: requested size of send buffer, in bytes 1679 * @rcvsize: requested size of receive buffer, in bytes 1680 * 1681 * Set socket send and receive buffer size limits. 1682 */ 1683 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1684 { 1685 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1686 1687 transport->sndsize = 0; 1688 if (sndsize) 1689 transport->sndsize = sndsize + 1024; 1690 transport->rcvsize = 0; 1691 if (rcvsize) 1692 transport->rcvsize = rcvsize + 1024; 1693 1694 xs_udp_do_set_buffer_size(xprt); 1695 } 1696 1697 /** 1698 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1699 * @task: task that timed out 1700 * 1701 * Adjust the congestion window after a retransmit timeout has occurred. 1702 */ 1703 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1704 { 1705 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1706 } 1707 1708 static unsigned short xs_get_random_port(void) 1709 { 1710 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1711 unsigned short rand = (unsigned short) prandom_u32() % range; 1712 return rand + xprt_min_resvport; 1713 } 1714 1715 /** 1716 * xs_set_port - reset the port number in the remote endpoint address 1717 * @xprt: generic transport 1718 * @port: new port number 1719 * 1720 */ 1721 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1722 { 1723 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1724 1725 rpc_set_port(xs_addr(xprt), port); 1726 xs_update_peer_port(xprt); 1727 } 1728 1729 static unsigned short xs_get_srcport(struct sock_xprt *transport) 1730 { 1731 unsigned short port = transport->srcport; 1732 1733 if (port == 0 && transport->xprt.resvport) 1734 port = xs_get_random_port(); 1735 return port; 1736 } 1737 1738 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1739 { 1740 if (transport->srcport != 0) 1741 transport->srcport = 0; 1742 if (!transport->xprt.resvport) 1743 return 0; 1744 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1745 return xprt_max_resvport; 1746 return --port; 1747 } 1748 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1749 { 1750 struct sockaddr_storage myaddr; 1751 int err, nloop = 0; 1752 unsigned short port = xs_get_srcport(transport); 1753 unsigned short last; 1754 1755 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1756 do { 1757 rpc_set_port((struct sockaddr *)&myaddr, port); 1758 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1759 transport->xprt.addrlen); 1760 if (port == 0) 1761 break; 1762 if (err == 0) { 1763 transport->srcport = port; 1764 break; 1765 } 1766 last = port; 1767 port = xs_next_srcport(transport, port); 1768 if (port > last) 1769 nloop++; 1770 } while (err == -EADDRINUSE && nloop != 2); 1771 1772 if (myaddr.ss_family == AF_INET) 1773 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1774 &((struct sockaddr_in *)&myaddr)->sin_addr, 1775 port, err ? "failed" : "ok", err); 1776 else 1777 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1778 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1779 port, err ? "failed" : "ok", err); 1780 return err; 1781 } 1782 1783 /* 1784 * We don't support autobind on AF_LOCAL sockets 1785 */ 1786 static void xs_local_rpcbind(struct rpc_task *task) 1787 { 1788 rcu_read_lock(); 1789 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); 1790 rcu_read_unlock(); 1791 } 1792 1793 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1794 { 1795 } 1796 1797 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1798 static struct lock_class_key xs_key[2]; 1799 static struct lock_class_key xs_slock_key[2]; 1800 1801 static inline void xs_reclassify_socketu(struct socket *sock) 1802 { 1803 struct sock *sk = sock->sk; 1804 1805 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1806 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1807 } 1808 1809 static inline void xs_reclassify_socket4(struct socket *sock) 1810 { 1811 struct sock *sk = sock->sk; 1812 1813 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1814 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1815 } 1816 1817 static inline void xs_reclassify_socket6(struct socket *sock) 1818 { 1819 struct sock *sk = sock->sk; 1820 1821 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1822 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1823 } 1824 1825 static inline void xs_reclassify_socket(int family, struct socket *sock) 1826 { 1827 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1828 if (sock_owned_by_user(sock->sk)) 1829 return; 1830 1831 switch (family) { 1832 case AF_LOCAL: 1833 xs_reclassify_socketu(sock); 1834 break; 1835 case AF_INET: 1836 xs_reclassify_socket4(sock); 1837 break; 1838 case AF_INET6: 1839 xs_reclassify_socket6(sock); 1840 break; 1841 } 1842 } 1843 #else 1844 static inline void xs_reclassify_socketu(struct socket *sock) 1845 { 1846 } 1847 1848 static inline void xs_reclassify_socket4(struct socket *sock) 1849 { 1850 } 1851 1852 static inline void xs_reclassify_socket6(struct socket *sock) 1853 { 1854 } 1855 1856 static inline void xs_reclassify_socket(int family, struct socket *sock) 1857 { 1858 } 1859 #endif 1860 1861 static void xs_dummy_setup_socket(struct work_struct *work) 1862 { 1863 } 1864 1865 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1866 struct sock_xprt *transport, int family, int type, int protocol) 1867 { 1868 struct socket *sock; 1869 int err; 1870 1871 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1872 if (err < 0) { 1873 dprintk("RPC: can't create %d transport socket (%d).\n", 1874 protocol, -err); 1875 goto out; 1876 } 1877 xs_reclassify_socket(family, sock); 1878 1879 err = xs_bind(transport, sock); 1880 if (err) { 1881 sock_release(sock); 1882 goto out; 1883 } 1884 1885 return sock; 1886 out: 1887 return ERR_PTR(err); 1888 } 1889 1890 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1891 struct socket *sock) 1892 { 1893 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1894 xprt); 1895 1896 if (!transport->inet) { 1897 struct sock *sk = sock->sk; 1898 1899 write_lock_bh(&sk->sk_callback_lock); 1900 1901 xs_save_old_callbacks(transport, sk); 1902 1903 sk->sk_user_data = xprt; 1904 sk->sk_data_ready = xs_local_data_ready; 1905 sk->sk_write_space = xs_udp_write_space; 1906 sk->sk_error_report = xs_error_report; 1907 sk->sk_allocation = GFP_ATOMIC; 1908 1909 xprt_clear_connected(xprt); 1910 1911 /* Reset to new socket */ 1912 transport->sock = sock; 1913 transport->inet = sk; 1914 1915 write_unlock_bh(&sk->sk_callback_lock); 1916 } 1917 1918 /* Tell the socket layer to start connecting... */ 1919 xprt->stat.connect_count++; 1920 xprt->stat.connect_start = jiffies; 1921 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1922 } 1923 1924 /** 1925 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1926 * @xprt: RPC transport to connect 1927 * @transport: socket transport to connect 1928 * @create_sock: function to create a socket of the correct type 1929 */ 1930 static int xs_local_setup_socket(struct sock_xprt *transport) 1931 { 1932 struct rpc_xprt *xprt = &transport->xprt; 1933 struct socket *sock; 1934 int status = -EIO; 1935 1936 current->flags |= PF_FSTRANS; 1937 1938 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1939 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1940 SOCK_STREAM, 0, &sock, 1); 1941 if (status < 0) { 1942 dprintk("RPC: can't create AF_LOCAL " 1943 "transport socket (%d).\n", -status); 1944 goto out; 1945 } 1946 xs_reclassify_socketu(sock); 1947 1948 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1949 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1950 1951 status = xs_local_finish_connecting(xprt, sock); 1952 trace_rpc_socket_connect(xprt, sock, status); 1953 switch (status) { 1954 case 0: 1955 dprintk("RPC: xprt %p connected to %s\n", 1956 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1957 xprt_set_connected(xprt); 1958 break; 1959 case -ENOENT: 1960 dprintk("RPC: xprt %p: socket %s does not exist\n", 1961 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1962 break; 1963 case -ECONNREFUSED: 1964 dprintk("RPC: xprt %p: connection refused for %s\n", 1965 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1966 break; 1967 default: 1968 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1969 __func__, -status, 1970 xprt->address_strings[RPC_DISPLAY_ADDR]); 1971 } 1972 1973 out: 1974 xprt_clear_connecting(xprt); 1975 xprt_wake_pending_tasks(xprt, status); 1976 current->flags &= ~PF_FSTRANS; 1977 return status; 1978 } 1979 1980 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1981 { 1982 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1983 int ret; 1984 1985 if (RPC_IS_ASYNC(task)) { 1986 /* 1987 * We want the AF_LOCAL connect to be resolved in the 1988 * filesystem namespace of the process making the rpc 1989 * call. Thus we connect synchronously. 1990 * 1991 * If we want to support asynchronous AF_LOCAL calls, 1992 * we'll need to figure out how to pass a namespace to 1993 * connect. 1994 */ 1995 rpc_exit(task, -ENOTCONN); 1996 return; 1997 } 1998 ret = xs_local_setup_socket(transport); 1999 if (ret && !RPC_IS_SOFTCONN(task)) 2000 msleep_interruptible(15000); 2001 } 2002 2003 #ifdef CONFIG_SUNRPC_SWAP 2004 static void xs_set_memalloc(struct rpc_xprt *xprt) 2005 { 2006 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2007 xprt); 2008 2009 if (xprt->swapper) 2010 sk_set_memalloc(transport->inet); 2011 } 2012 2013 /** 2014 * xs_swapper - Tag this transport as being used for swap. 2015 * @xprt: transport to tag 2016 * @enable: enable/disable 2017 * 2018 */ 2019 int xs_swapper(struct rpc_xprt *xprt, int enable) 2020 { 2021 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2022 xprt); 2023 int err = 0; 2024 2025 if (enable) { 2026 xprt->swapper++; 2027 xs_set_memalloc(xprt); 2028 } else if (xprt->swapper) { 2029 xprt->swapper--; 2030 sk_clear_memalloc(transport->inet); 2031 } 2032 2033 return err; 2034 } 2035 EXPORT_SYMBOL_GPL(xs_swapper); 2036 #else 2037 static void xs_set_memalloc(struct rpc_xprt *xprt) 2038 { 2039 } 2040 #endif 2041 2042 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2043 { 2044 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2045 2046 if (!transport->inet) { 2047 struct sock *sk = sock->sk; 2048 2049 write_lock_bh(&sk->sk_callback_lock); 2050 2051 xs_save_old_callbacks(transport, sk); 2052 2053 sk->sk_user_data = xprt; 2054 sk->sk_data_ready = xs_udp_data_ready; 2055 sk->sk_write_space = xs_udp_write_space; 2056 sk->sk_no_check = UDP_CSUM_NORCV; 2057 sk->sk_allocation = GFP_ATOMIC; 2058 2059 xprt_set_connected(xprt); 2060 2061 /* Reset to new socket */ 2062 transport->sock = sock; 2063 transport->inet = sk; 2064 2065 xs_set_memalloc(xprt); 2066 2067 write_unlock_bh(&sk->sk_callback_lock); 2068 } 2069 xs_udp_do_set_buffer_size(xprt); 2070 } 2071 2072 static void xs_udp_setup_socket(struct work_struct *work) 2073 { 2074 struct sock_xprt *transport = 2075 container_of(work, struct sock_xprt, connect_worker.work); 2076 struct rpc_xprt *xprt = &transport->xprt; 2077 struct socket *sock = transport->sock; 2078 int status = -EIO; 2079 2080 current->flags |= PF_FSTRANS; 2081 2082 /* Start by resetting any existing state */ 2083 xs_reset_transport(transport); 2084 sock = xs_create_sock(xprt, transport, 2085 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP); 2086 if (IS_ERR(sock)) 2087 goto out; 2088 2089 dprintk("RPC: worker connecting xprt %p via %s to " 2090 "%s (port %s)\n", xprt, 2091 xprt->address_strings[RPC_DISPLAY_PROTO], 2092 xprt->address_strings[RPC_DISPLAY_ADDR], 2093 xprt->address_strings[RPC_DISPLAY_PORT]); 2094 2095 xs_udp_finish_connecting(xprt, sock); 2096 trace_rpc_socket_connect(xprt, sock, 0); 2097 status = 0; 2098 out: 2099 xprt_clear_connecting(xprt); 2100 xprt_wake_pending_tasks(xprt, status); 2101 current->flags &= ~PF_FSTRANS; 2102 } 2103 2104 /* 2105 * We need to preserve the port number so the reply cache on the server can 2106 * find our cached RPC replies when we get around to reconnecting. 2107 */ 2108 static void xs_abort_connection(struct sock_xprt *transport) 2109 { 2110 int result; 2111 struct sockaddr any; 2112 2113 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport); 2114 2115 /* 2116 * Disconnect the transport socket by doing a connect operation 2117 * with AF_UNSPEC. This should return immediately... 2118 */ 2119 memset(&any, 0, sizeof(any)); 2120 any.sa_family = AF_UNSPEC; 2121 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 2122 trace_rpc_socket_reset_connection(&transport->xprt, 2123 transport->sock, result); 2124 if (!result) 2125 xs_sock_reset_connection_flags(&transport->xprt); 2126 dprintk("RPC: AF_UNSPEC connect return code %d\n", result); 2127 } 2128 2129 static void xs_tcp_reuse_connection(struct sock_xprt *transport) 2130 { 2131 unsigned int state = transport->inet->sk_state; 2132 2133 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) { 2134 /* we don't need to abort the connection if the socket 2135 * hasn't undergone a shutdown 2136 */ 2137 if (transport->inet->sk_shutdown == 0) 2138 return; 2139 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n", 2140 __func__, transport->inet->sk_shutdown); 2141 } 2142 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) { 2143 /* we don't need to abort the connection if the socket 2144 * hasn't undergone a shutdown 2145 */ 2146 if (transport->inet->sk_shutdown == 0) 2147 return; 2148 dprintk("RPC: %s: ESTABLISHED/SYN_SENT " 2149 "sk_shutdown set to %d\n", 2150 __func__, transport->inet->sk_shutdown); 2151 } 2152 xs_abort_connection(transport); 2153 } 2154 2155 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2156 { 2157 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2158 int ret = -ENOTCONN; 2159 2160 if (!transport->inet) { 2161 struct sock *sk = sock->sk; 2162 unsigned int keepidle = xprt->timeout->to_initval / HZ; 2163 unsigned int keepcnt = xprt->timeout->to_retries + 1; 2164 unsigned int opt_on = 1; 2165 2166 /* TCP Keepalive options */ 2167 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2168 (char *)&opt_on, sizeof(opt_on)); 2169 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2170 (char *)&keepidle, sizeof(keepidle)); 2171 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2172 (char *)&keepidle, sizeof(keepidle)); 2173 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2174 (char *)&keepcnt, sizeof(keepcnt)); 2175 2176 write_lock_bh(&sk->sk_callback_lock); 2177 2178 xs_save_old_callbacks(transport, sk); 2179 2180 sk->sk_user_data = xprt; 2181 sk->sk_data_ready = xs_tcp_data_ready; 2182 sk->sk_state_change = xs_tcp_state_change; 2183 sk->sk_write_space = xs_tcp_write_space; 2184 sk->sk_error_report = xs_error_report; 2185 sk->sk_allocation = GFP_ATOMIC; 2186 2187 /* socket options */ 2188 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 2189 sock_reset_flag(sk, SOCK_LINGER); 2190 tcp_sk(sk)->linger2 = 0; 2191 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2192 2193 xprt_clear_connected(xprt); 2194 2195 /* Reset to new socket */ 2196 transport->sock = sock; 2197 transport->inet = sk; 2198 2199 write_unlock_bh(&sk->sk_callback_lock); 2200 } 2201 2202 if (!xprt_bound(xprt)) 2203 goto out; 2204 2205 xs_set_memalloc(xprt); 2206 2207 /* Tell the socket layer to start connecting... */ 2208 xprt->stat.connect_count++; 2209 xprt->stat.connect_start = jiffies; 2210 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2211 switch (ret) { 2212 case 0: 2213 case -EINPROGRESS: 2214 /* SYN_SENT! */ 2215 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2216 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2217 } 2218 out: 2219 return ret; 2220 } 2221 2222 /** 2223 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2224 * @xprt: RPC transport to connect 2225 * @transport: socket transport to connect 2226 * @create_sock: function to create a socket of the correct type 2227 * 2228 * Invoked by a work queue tasklet. 2229 */ 2230 static void xs_tcp_setup_socket(struct work_struct *work) 2231 { 2232 struct sock_xprt *transport = 2233 container_of(work, struct sock_xprt, connect_worker.work); 2234 struct socket *sock = transport->sock; 2235 struct rpc_xprt *xprt = &transport->xprt; 2236 int status = -EIO; 2237 2238 current->flags |= PF_FSTRANS; 2239 2240 if (!sock) { 2241 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 2242 sock = xs_create_sock(xprt, transport, 2243 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP); 2244 if (IS_ERR(sock)) { 2245 status = PTR_ERR(sock); 2246 goto out; 2247 } 2248 } else { 2249 int abort_and_exit; 2250 2251 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 2252 &xprt->state); 2253 /* "close" the socket, preserving the local port */ 2254 xs_tcp_reuse_connection(transport); 2255 2256 if (abort_and_exit) 2257 goto out_eagain; 2258 } 2259 2260 dprintk("RPC: worker connecting xprt %p via %s to " 2261 "%s (port %s)\n", xprt, 2262 xprt->address_strings[RPC_DISPLAY_PROTO], 2263 xprt->address_strings[RPC_DISPLAY_ADDR], 2264 xprt->address_strings[RPC_DISPLAY_PORT]); 2265 2266 status = xs_tcp_finish_connecting(xprt, sock); 2267 trace_rpc_socket_connect(xprt, sock, status); 2268 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2269 xprt, -status, xprt_connected(xprt), 2270 sock->sk->sk_state); 2271 switch (status) { 2272 default: 2273 printk("%s: connect returned unhandled error %d\n", 2274 __func__, status); 2275 case -EADDRNOTAVAIL: 2276 /* We're probably in TIME_WAIT. Get rid of existing socket, 2277 * and retry 2278 */ 2279 xs_tcp_force_close(xprt); 2280 break; 2281 case 0: 2282 case -EINPROGRESS: 2283 case -EALREADY: 2284 xprt_clear_connecting(xprt); 2285 current->flags &= ~PF_FSTRANS; 2286 return; 2287 case -EINVAL: 2288 /* Happens, for instance, if the user specified a link 2289 * local IPv6 address without a scope-id. 2290 */ 2291 case -ECONNREFUSED: 2292 case -ECONNRESET: 2293 case -ENETUNREACH: 2294 /* retry with existing socket, after a delay */ 2295 goto out; 2296 } 2297 out_eagain: 2298 status = -EAGAIN; 2299 out: 2300 xprt_clear_connecting(xprt); 2301 xprt_wake_pending_tasks(xprt, status); 2302 current->flags &= ~PF_FSTRANS; 2303 } 2304 2305 /** 2306 * xs_connect - connect a socket to a remote endpoint 2307 * @xprt: pointer to transport structure 2308 * @task: address of RPC task that manages state of connect request 2309 * 2310 * TCP: If the remote end dropped the connection, delay reconnecting. 2311 * 2312 * UDP socket connects are synchronous, but we use a work queue anyway 2313 * to guarantee that even unprivileged user processes can set up a 2314 * socket on a privileged port. 2315 * 2316 * If a UDP socket connect fails, the delay behavior here prevents 2317 * retry floods (hard mounts). 2318 */ 2319 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2320 { 2321 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2322 2323 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2324 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2325 "seconds\n", 2326 xprt, xprt->reestablish_timeout / HZ); 2327 queue_delayed_work(rpciod_workqueue, 2328 &transport->connect_worker, 2329 xprt->reestablish_timeout); 2330 xprt->reestablish_timeout <<= 1; 2331 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2332 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2333 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2334 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2335 } else { 2336 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2337 queue_delayed_work(rpciod_workqueue, 2338 &transport->connect_worker, 0); 2339 } 2340 } 2341 2342 /** 2343 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2344 * @xprt: rpc_xprt struct containing statistics 2345 * @seq: output file 2346 * 2347 */ 2348 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2349 { 2350 long idle_time = 0; 2351 2352 if (xprt_connected(xprt)) 2353 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2354 2355 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2356 "%llu %llu %lu %llu %llu\n", 2357 xprt->stat.bind_count, 2358 xprt->stat.connect_count, 2359 xprt->stat.connect_time, 2360 idle_time, 2361 xprt->stat.sends, 2362 xprt->stat.recvs, 2363 xprt->stat.bad_xids, 2364 xprt->stat.req_u, 2365 xprt->stat.bklog_u, 2366 xprt->stat.max_slots, 2367 xprt->stat.sending_u, 2368 xprt->stat.pending_u); 2369 } 2370 2371 /** 2372 * xs_udp_print_stats - display UDP socket-specifc stats 2373 * @xprt: rpc_xprt struct containing statistics 2374 * @seq: output file 2375 * 2376 */ 2377 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2378 { 2379 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2380 2381 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2382 "%lu %llu %llu\n", 2383 transport->srcport, 2384 xprt->stat.bind_count, 2385 xprt->stat.sends, 2386 xprt->stat.recvs, 2387 xprt->stat.bad_xids, 2388 xprt->stat.req_u, 2389 xprt->stat.bklog_u, 2390 xprt->stat.max_slots, 2391 xprt->stat.sending_u, 2392 xprt->stat.pending_u); 2393 } 2394 2395 /** 2396 * xs_tcp_print_stats - display TCP socket-specifc stats 2397 * @xprt: rpc_xprt struct containing statistics 2398 * @seq: output file 2399 * 2400 */ 2401 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2402 { 2403 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2404 long idle_time = 0; 2405 2406 if (xprt_connected(xprt)) 2407 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2408 2409 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2410 "%llu %llu %lu %llu %llu\n", 2411 transport->srcport, 2412 xprt->stat.bind_count, 2413 xprt->stat.connect_count, 2414 xprt->stat.connect_time, 2415 idle_time, 2416 xprt->stat.sends, 2417 xprt->stat.recvs, 2418 xprt->stat.bad_xids, 2419 xprt->stat.req_u, 2420 xprt->stat.bklog_u, 2421 xprt->stat.max_slots, 2422 xprt->stat.sending_u, 2423 xprt->stat.pending_u); 2424 } 2425 2426 /* 2427 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2428 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2429 * to use the server side send routines. 2430 */ 2431 static void *bc_malloc(struct rpc_task *task, size_t size) 2432 { 2433 struct page *page; 2434 struct rpc_buffer *buf; 2435 2436 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2437 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2438 return NULL; 2439 2440 page = alloc_page(GFP_KERNEL); 2441 if (!page) 2442 return NULL; 2443 2444 buf = page_address(page); 2445 buf->len = PAGE_SIZE; 2446 2447 return buf->data; 2448 } 2449 2450 /* 2451 * Free the space allocated in the bc_alloc routine 2452 */ 2453 static void bc_free(void *buffer) 2454 { 2455 struct rpc_buffer *buf; 2456 2457 if (!buffer) 2458 return; 2459 2460 buf = container_of(buffer, struct rpc_buffer, data); 2461 free_page((unsigned long)buf); 2462 } 2463 2464 /* 2465 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2466 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2467 */ 2468 static int bc_sendto(struct rpc_rqst *req) 2469 { 2470 int len; 2471 struct xdr_buf *xbufp = &req->rq_snd_buf; 2472 struct rpc_xprt *xprt = req->rq_xprt; 2473 struct sock_xprt *transport = 2474 container_of(xprt, struct sock_xprt, xprt); 2475 struct socket *sock = transport->sock; 2476 unsigned long headoff; 2477 unsigned long tailoff; 2478 2479 xs_encode_stream_record_marker(xbufp); 2480 2481 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2482 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2483 len = svc_send_common(sock, xbufp, 2484 virt_to_page(xbufp->head[0].iov_base), headoff, 2485 xbufp->tail[0].iov_base, tailoff); 2486 2487 if (len != xbufp->len) { 2488 printk(KERN_NOTICE "Error sending entire callback!\n"); 2489 len = -EAGAIN; 2490 } 2491 2492 return len; 2493 } 2494 2495 /* 2496 * The send routine. Borrows from svc_send 2497 */ 2498 static int bc_send_request(struct rpc_task *task) 2499 { 2500 struct rpc_rqst *req = task->tk_rqstp; 2501 struct svc_xprt *xprt; 2502 u32 len; 2503 2504 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2505 /* 2506 * Get the server socket associated with this callback xprt 2507 */ 2508 xprt = req->rq_xprt->bc_xprt; 2509 2510 /* 2511 * Grab the mutex to serialize data as the connection is shared 2512 * with the fore channel 2513 */ 2514 if (!mutex_trylock(&xprt->xpt_mutex)) { 2515 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2516 if (!mutex_trylock(&xprt->xpt_mutex)) 2517 return -EAGAIN; 2518 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2519 } 2520 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2521 len = -ENOTCONN; 2522 else 2523 len = bc_sendto(req); 2524 mutex_unlock(&xprt->xpt_mutex); 2525 2526 if (len > 0) 2527 len = 0; 2528 2529 return len; 2530 } 2531 2532 /* 2533 * The close routine. Since this is client initiated, we do nothing 2534 */ 2535 2536 static void bc_close(struct rpc_xprt *xprt) 2537 { 2538 } 2539 2540 /* 2541 * The xprt destroy routine. Again, because this connection is client 2542 * initiated, we do nothing 2543 */ 2544 2545 static void bc_destroy(struct rpc_xprt *xprt) 2546 { 2547 } 2548 2549 static struct rpc_xprt_ops xs_local_ops = { 2550 .reserve_xprt = xprt_reserve_xprt, 2551 .release_xprt = xs_tcp_release_xprt, 2552 .alloc_slot = xprt_alloc_slot, 2553 .rpcbind = xs_local_rpcbind, 2554 .set_port = xs_local_set_port, 2555 .connect = xs_local_connect, 2556 .buf_alloc = rpc_malloc, 2557 .buf_free = rpc_free, 2558 .send_request = xs_local_send_request, 2559 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2560 .close = xs_close, 2561 .destroy = xs_destroy, 2562 .print_stats = xs_local_print_stats, 2563 }; 2564 2565 static struct rpc_xprt_ops xs_udp_ops = { 2566 .set_buffer_size = xs_udp_set_buffer_size, 2567 .reserve_xprt = xprt_reserve_xprt_cong, 2568 .release_xprt = xprt_release_xprt_cong, 2569 .alloc_slot = xprt_alloc_slot, 2570 .rpcbind = rpcb_getport_async, 2571 .set_port = xs_set_port, 2572 .connect = xs_connect, 2573 .buf_alloc = rpc_malloc, 2574 .buf_free = rpc_free, 2575 .send_request = xs_udp_send_request, 2576 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2577 .timer = xs_udp_timer, 2578 .release_request = xprt_release_rqst_cong, 2579 .close = xs_close, 2580 .destroy = xs_destroy, 2581 .print_stats = xs_udp_print_stats, 2582 }; 2583 2584 static struct rpc_xprt_ops xs_tcp_ops = { 2585 .reserve_xprt = xprt_reserve_xprt, 2586 .release_xprt = xs_tcp_release_xprt, 2587 .alloc_slot = xprt_lock_and_alloc_slot, 2588 .rpcbind = rpcb_getport_async, 2589 .set_port = xs_set_port, 2590 .connect = xs_connect, 2591 .buf_alloc = rpc_malloc, 2592 .buf_free = rpc_free, 2593 .send_request = xs_tcp_send_request, 2594 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2595 .close = xs_tcp_close, 2596 .destroy = xs_destroy, 2597 .print_stats = xs_tcp_print_stats, 2598 }; 2599 2600 /* 2601 * The rpc_xprt_ops for the server backchannel 2602 */ 2603 2604 static struct rpc_xprt_ops bc_tcp_ops = { 2605 .reserve_xprt = xprt_reserve_xprt, 2606 .release_xprt = xprt_release_xprt, 2607 .alloc_slot = xprt_alloc_slot, 2608 .buf_alloc = bc_malloc, 2609 .buf_free = bc_free, 2610 .send_request = bc_send_request, 2611 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2612 .close = bc_close, 2613 .destroy = bc_destroy, 2614 .print_stats = xs_tcp_print_stats, 2615 }; 2616 2617 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2618 { 2619 static const struct sockaddr_in sin = { 2620 .sin_family = AF_INET, 2621 .sin_addr.s_addr = htonl(INADDR_ANY), 2622 }; 2623 static const struct sockaddr_in6 sin6 = { 2624 .sin6_family = AF_INET6, 2625 .sin6_addr = IN6ADDR_ANY_INIT, 2626 }; 2627 2628 switch (family) { 2629 case AF_LOCAL: 2630 break; 2631 case AF_INET: 2632 memcpy(sap, &sin, sizeof(sin)); 2633 break; 2634 case AF_INET6: 2635 memcpy(sap, &sin6, sizeof(sin6)); 2636 break; 2637 default: 2638 dprintk("RPC: %s: Bad address family\n", __func__); 2639 return -EAFNOSUPPORT; 2640 } 2641 return 0; 2642 } 2643 2644 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2645 unsigned int slot_table_size, 2646 unsigned int max_slot_table_size) 2647 { 2648 struct rpc_xprt *xprt; 2649 struct sock_xprt *new; 2650 2651 if (args->addrlen > sizeof(xprt->addr)) { 2652 dprintk("RPC: xs_setup_xprt: address too large\n"); 2653 return ERR_PTR(-EBADF); 2654 } 2655 2656 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2657 max_slot_table_size); 2658 if (xprt == NULL) { 2659 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2660 "rpc_xprt\n"); 2661 return ERR_PTR(-ENOMEM); 2662 } 2663 2664 new = container_of(xprt, struct sock_xprt, xprt); 2665 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2666 xprt->addrlen = args->addrlen; 2667 if (args->srcaddr) 2668 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2669 else { 2670 int err; 2671 err = xs_init_anyaddr(args->dstaddr->sa_family, 2672 (struct sockaddr *)&new->srcaddr); 2673 if (err != 0) { 2674 xprt_free(xprt); 2675 return ERR_PTR(err); 2676 } 2677 } 2678 2679 return xprt; 2680 } 2681 2682 static const struct rpc_timeout xs_local_default_timeout = { 2683 .to_initval = 10 * HZ, 2684 .to_maxval = 10 * HZ, 2685 .to_retries = 2, 2686 }; 2687 2688 /** 2689 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2690 * @args: rpc transport creation arguments 2691 * 2692 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2693 */ 2694 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2695 { 2696 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2697 struct sock_xprt *transport; 2698 struct rpc_xprt *xprt; 2699 struct rpc_xprt *ret; 2700 2701 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2702 xprt_max_tcp_slot_table_entries); 2703 if (IS_ERR(xprt)) 2704 return xprt; 2705 transport = container_of(xprt, struct sock_xprt, xprt); 2706 2707 xprt->prot = 0; 2708 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2709 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2710 2711 xprt->bind_timeout = XS_BIND_TO; 2712 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2713 xprt->idle_timeout = XS_IDLE_DISC_TO; 2714 2715 xprt->ops = &xs_local_ops; 2716 xprt->timeout = &xs_local_default_timeout; 2717 2718 INIT_DELAYED_WORK(&transport->connect_worker, 2719 xs_dummy_setup_socket); 2720 2721 switch (sun->sun_family) { 2722 case AF_LOCAL: 2723 if (sun->sun_path[0] != '/') { 2724 dprintk("RPC: bad AF_LOCAL address: %s\n", 2725 sun->sun_path); 2726 ret = ERR_PTR(-EINVAL); 2727 goto out_err; 2728 } 2729 xprt_set_bound(xprt); 2730 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2731 ret = ERR_PTR(xs_local_setup_socket(transport)); 2732 if (ret) 2733 goto out_err; 2734 break; 2735 default: 2736 ret = ERR_PTR(-EAFNOSUPPORT); 2737 goto out_err; 2738 } 2739 2740 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2741 xprt->address_strings[RPC_DISPLAY_ADDR]); 2742 2743 if (try_module_get(THIS_MODULE)) 2744 return xprt; 2745 ret = ERR_PTR(-EINVAL); 2746 out_err: 2747 xprt_free(xprt); 2748 return ret; 2749 } 2750 2751 static const struct rpc_timeout xs_udp_default_timeout = { 2752 .to_initval = 5 * HZ, 2753 .to_maxval = 30 * HZ, 2754 .to_increment = 5 * HZ, 2755 .to_retries = 5, 2756 }; 2757 2758 /** 2759 * xs_setup_udp - Set up transport to use a UDP socket 2760 * @args: rpc transport creation arguments 2761 * 2762 */ 2763 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2764 { 2765 struct sockaddr *addr = args->dstaddr; 2766 struct rpc_xprt *xprt; 2767 struct sock_xprt *transport; 2768 struct rpc_xprt *ret; 2769 2770 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2771 xprt_udp_slot_table_entries); 2772 if (IS_ERR(xprt)) 2773 return xprt; 2774 transport = container_of(xprt, struct sock_xprt, xprt); 2775 2776 xprt->prot = IPPROTO_UDP; 2777 xprt->tsh_size = 0; 2778 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2779 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2780 2781 xprt->bind_timeout = XS_BIND_TO; 2782 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2783 xprt->idle_timeout = XS_IDLE_DISC_TO; 2784 2785 xprt->ops = &xs_udp_ops; 2786 2787 xprt->timeout = &xs_udp_default_timeout; 2788 2789 switch (addr->sa_family) { 2790 case AF_INET: 2791 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2792 xprt_set_bound(xprt); 2793 2794 INIT_DELAYED_WORK(&transport->connect_worker, 2795 xs_udp_setup_socket); 2796 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2797 break; 2798 case AF_INET6: 2799 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2800 xprt_set_bound(xprt); 2801 2802 INIT_DELAYED_WORK(&transport->connect_worker, 2803 xs_udp_setup_socket); 2804 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2805 break; 2806 default: 2807 ret = ERR_PTR(-EAFNOSUPPORT); 2808 goto out_err; 2809 } 2810 2811 if (xprt_bound(xprt)) 2812 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2813 xprt->address_strings[RPC_DISPLAY_ADDR], 2814 xprt->address_strings[RPC_DISPLAY_PORT], 2815 xprt->address_strings[RPC_DISPLAY_PROTO]); 2816 else 2817 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2818 xprt->address_strings[RPC_DISPLAY_ADDR], 2819 xprt->address_strings[RPC_DISPLAY_PROTO]); 2820 2821 if (try_module_get(THIS_MODULE)) 2822 return xprt; 2823 ret = ERR_PTR(-EINVAL); 2824 out_err: 2825 xprt_free(xprt); 2826 return ret; 2827 } 2828 2829 static const struct rpc_timeout xs_tcp_default_timeout = { 2830 .to_initval = 60 * HZ, 2831 .to_maxval = 60 * HZ, 2832 .to_retries = 2, 2833 }; 2834 2835 /** 2836 * xs_setup_tcp - Set up transport to use a TCP socket 2837 * @args: rpc transport creation arguments 2838 * 2839 */ 2840 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2841 { 2842 struct sockaddr *addr = args->dstaddr; 2843 struct rpc_xprt *xprt; 2844 struct sock_xprt *transport; 2845 struct rpc_xprt *ret; 2846 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2847 2848 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2849 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2850 2851 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2852 max_slot_table_size); 2853 if (IS_ERR(xprt)) 2854 return xprt; 2855 transport = container_of(xprt, struct sock_xprt, xprt); 2856 2857 xprt->prot = IPPROTO_TCP; 2858 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2859 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2860 2861 xprt->bind_timeout = XS_BIND_TO; 2862 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2863 xprt->idle_timeout = XS_IDLE_DISC_TO; 2864 2865 xprt->ops = &xs_tcp_ops; 2866 xprt->timeout = &xs_tcp_default_timeout; 2867 2868 switch (addr->sa_family) { 2869 case AF_INET: 2870 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2871 xprt_set_bound(xprt); 2872 2873 INIT_DELAYED_WORK(&transport->connect_worker, 2874 xs_tcp_setup_socket); 2875 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2876 break; 2877 case AF_INET6: 2878 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2879 xprt_set_bound(xprt); 2880 2881 INIT_DELAYED_WORK(&transport->connect_worker, 2882 xs_tcp_setup_socket); 2883 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2884 break; 2885 default: 2886 ret = ERR_PTR(-EAFNOSUPPORT); 2887 goto out_err; 2888 } 2889 2890 if (xprt_bound(xprt)) 2891 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2892 xprt->address_strings[RPC_DISPLAY_ADDR], 2893 xprt->address_strings[RPC_DISPLAY_PORT], 2894 xprt->address_strings[RPC_DISPLAY_PROTO]); 2895 else 2896 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2897 xprt->address_strings[RPC_DISPLAY_ADDR], 2898 xprt->address_strings[RPC_DISPLAY_PROTO]); 2899 2900 2901 if (try_module_get(THIS_MODULE)) 2902 return xprt; 2903 ret = ERR_PTR(-EINVAL); 2904 out_err: 2905 xprt_free(xprt); 2906 return ret; 2907 } 2908 2909 /** 2910 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2911 * @args: rpc transport creation arguments 2912 * 2913 */ 2914 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2915 { 2916 struct sockaddr *addr = args->dstaddr; 2917 struct rpc_xprt *xprt; 2918 struct sock_xprt *transport; 2919 struct svc_sock *bc_sock; 2920 struct rpc_xprt *ret; 2921 2922 if (args->bc_xprt->xpt_bc_xprt) { 2923 /* 2924 * This server connection already has a backchannel 2925 * transport; we can't create a new one, as we wouldn't 2926 * be able to match replies based on xid any more. So, 2927 * reuse the already-existing one: 2928 */ 2929 return args->bc_xprt->xpt_bc_xprt; 2930 } 2931 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2932 xprt_tcp_slot_table_entries); 2933 if (IS_ERR(xprt)) 2934 return xprt; 2935 transport = container_of(xprt, struct sock_xprt, xprt); 2936 2937 xprt->prot = IPPROTO_TCP; 2938 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2939 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2940 xprt->timeout = &xs_tcp_default_timeout; 2941 2942 /* backchannel */ 2943 xprt_set_bound(xprt); 2944 xprt->bind_timeout = 0; 2945 xprt->reestablish_timeout = 0; 2946 xprt->idle_timeout = 0; 2947 2948 xprt->ops = &bc_tcp_ops; 2949 2950 switch (addr->sa_family) { 2951 case AF_INET: 2952 xs_format_peer_addresses(xprt, "tcp", 2953 RPCBIND_NETID_TCP); 2954 break; 2955 case AF_INET6: 2956 xs_format_peer_addresses(xprt, "tcp", 2957 RPCBIND_NETID_TCP6); 2958 break; 2959 default: 2960 ret = ERR_PTR(-EAFNOSUPPORT); 2961 goto out_err; 2962 } 2963 2964 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2965 xprt->address_strings[RPC_DISPLAY_ADDR], 2966 xprt->address_strings[RPC_DISPLAY_PORT], 2967 xprt->address_strings[RPC_DISPLAY_PROTO]); 2968 2969 /* 2970 * Once we've associated a backchannel xprt with a connection, 2971 * we want to keep it around as long as the connection lasts, 2972 * in case we need to start using it for a backchannel again; 2973 * this reference won't be dropped until bc_xprt is destroyed. 2974 */ 2975 xprt_get(xprt); 2976 args->bc_xprt->xpt_bc_xprt = xprt; 2977 xprt->bc_xprt = args->bc_xprt; 2978 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2979 transport->sock = bc_sock->sk_sock; 2980 transport->inet = bc_sock->sk_sk; 2981 2982 /* 2983 * Since we don't want connections for the backchannel, we set 2984 * the xprt status to connected 2985 */ 2986 xprt_set_connected(xprt); 2987 2988 2989 if (try_module_get(THIS_MODULE)) 2990 return xprt; 2991 xprt_put(xprt); 2992 ret = ERR_PTR(-EINVAL); 2993 out_err: 2994 xprt_free(xprt); 2995 return ret; 2996 } 2997 2998 static struct xprt_class xs_local_transport = { 2999 .list = LIST_HEAD_INIT(xs_local_transport.list), 3000 .name = "named UNIX socket", 3001 .owner = THIS_MODULE, 3002 .ident = XPRT_TRANSPORT_LOCAL, 3003 .setup = xs_setup_local, 3004 }; 3005 3006 static struct xprt_class xs_udp_transport = { 3007 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3008 .name = "udp", 3009 .owner = THIS_MODULE, 3010 .ident = XPRT_TRANSPORT_UDP, 3011 .setup = xs_setup_udp, 3012 }; 3013 3014 static struct xprt_class xs_tcp_transport = { 3015 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3016 .name = "tcp", 3017 .owner = THIS_MODULE, 3018 .ident = XPRT_TRANSPORT_TCP, 3019 .setup = xs_setup_tcp, 3020 }; 3021 3022 static struct xprt_class xs_bc_tcp_transport = { 3023 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3024 .name = "tcp NFSv4.1 backchannel", 3025 .owner = THIS_MODULE, 3026 .ident = XPRT_TRANSPORT_BC_TCP, 3027 .setup = xs_setup_bc_tcp, 3028 }; 3029 3030 /** 3031 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3032 * 3033 */ 3034 int init_socket_xprt(void) 3035 { 3036 #ifdef RPC_DEBUG 3037 if (!sunrpc_table_header) 3038 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3039 #endif 3040 3041 xprt_register_transport(&xs_local_transport); 3042 xprt_register_transport(&xs_udp_transport); 3043 xprt_register_transport(&xs_tcp_transport); 3044 xprt_register_transport(&xs_bc_tcp_transport); 3045 3046 return 0; 3047 } 3048 3049 /** 3050 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3051 * 3052 */ 3053 void cleanup_socket_xprt(void) 3054 { 3055 #ifdef RPC_DEBUG 3056 if (sunrpc_table_header) { 3057 unregister_sysctl_table(sunrpc_table_header); 3058 sunrpc_table_header = NULL; 3059 } 3060 #endif 3061 3062 xprt_unregister_transport(&xs_local_transport); 3063 xprt_unregister_transport(&xs_udp_transport); 3064 xprt_unregister_transport(&xs_tcp_transport); 3065 xprt_unregister_transport(&xs_bc_tcp_transport); 3066 } 3067 3068 static int param_set_uint_minmax(const char *val, 3069 const struct kernel_param *kp, 3070 unsigned int min, unsigned int max) 3071 { 3072 unsigned long num; 3073 int ret; 3074 3075 if (!val) 3076 return -EINVAL; 3077 ret = strict_strtoul(val, 0, &num); 3078 if (ret == -EINVAL || num < min || num > max) 3079 return -EINVAL; 3080 *((unsigned int *)kp->arg) = num; 3081 return 0; 3082 } 3083 3084 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3085 { 3086 return param_set_uint_minmax(val, kp, 3087 RPC_MIN_RESVPORT, 3088 RPC_MAX_RESVPORT); 3089 } 3090 3091 static struct kernel_param_ops param_ops_portnr = { 3092 .set = param_set_portnr, 3093 .get = param_get_uint, 3094 }; 3095 3096 #define param_check_portnr(name, p) \ 3097 __param_check(name, p, unsigned int); 3098 3099 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3100 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3101 3102 static int param_set_slot_table_size(const char *val, 3103 const struct kernel_param *kp) 3104 { 3105 return param_set_uint_minmax(val, kp, 3106 RPC_MIN_SLOT_TABLE, 3107 RPC_MAX_SLOT_TABLE); 3108 } 3109 3110 static struct kernel_param_ops param_ops_slot_table_size = { 3111 .set = param_set_slot_table_size, 3112 .get = param_get_uint, 3113 }; 3114 3115 #define param_check_slot_table_size(name, p) \ 3116 __param_check(name, p, unsigned int); 3117 3118 static int param_set_max_slot_table_size(const char *val, 3119 const struct kernel_param *kp) 3120 { 3121 return param_set_uint_minmax(val, kp, 3122 RPC_MIN_SLOT_TABLE, 3123 RPC_MAX_SLOT_TABLE_LIMIT); 3124 } 3125 3126 static struct kernel_param_ops param_ops_max_slot_table_size = { 3127 .set = param_set_max_slot_table_size, 3128 .get = param_get_uint, 3129 }; 3130 3131 #define param_check_max_slot_table_size(name, p) \ 3132 __param_check(name, p, unsigned int); 3133 3134 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3135 slot_table_size, 0644); 3136 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3137 max_slot_table_size, 0644); 3138 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3139 slot_table_size, 0644); 3140 3141