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