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