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/slab.h> 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/pagemap.h> 26 #include <linux/errno.h> 27 #include <linux/socket.h> 28 #include <linux/in.h> 29 #include <linux/net.h> 30 #include <linux/mm.h> 31 #include <linux/udp.h> 32 #include <linux/tcp.h> 33 #include <linux/sunrpc/clnt.h> 34 #include <linux/sunrpc/sched.h> 35 #include <linux/sunrpc/svcsock.h> 36 #include <linux/sunrpc/xprtsock.h> 37 #include <linux/file.h> 38 #ifdef CONFIG_NFS_V4_1 39 #include <linux/sunrpc/bc_xprt.h> 40 #endif 41 42 #include <net/sock.h> 43 #include <net/checksum.h> 44 #include <net/udp.h> 45 #include <net/tcp.h> 46 47 #include "sunrpc.h" 48 /* 49 * xprtsock tunables 50 */ 51 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 52 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; 53 54 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 55 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 56 57 #define XS_TCP_LINGER_TO (15U * HZ) 58 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 59 60 /* 61 * We can register our own files under /proc/sys/sunrpc by 62 * calling register_sysctl_table() again. The files in that 63 * directory become the union of all files registered there. 64 * 65 * We simply need to make sure that we don't collide with 66 * someone else's file names! 67 */ 68 69 #ifdef RPC_DEBUG 70 71 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 72 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 73 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 74 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 75 76 static struct ctl_table_header *sunrpc_table_header; 77 78 /* 79 * FIXME: changing the UDP slot table size should also resize the UDP 80 * socket buffers for existing UDP transports 81 */ 82 static ctl_table xs_tunables_table[] = { 83 { 84 .procname = "udp_slot_table_entries", 85 .data = &xprt_udp_slot_table_entries, 86 .maxlen = sizeof(unsigned int), 87 .mode = 0644, 88 .proc_handler = proc_dointvec_minmax, 89 .extra1 = &min_slot_table_size, 90 .extra2 = &max_slot_table_size 91 }, 92 { 93 .procname = "tcp_slot_table_entries", 94 .data = &xprt_tcp_slot_table_entries, 95 .maxlen = sizeof(unsigned int), 96 .mode = 0644, 97 .proc_handler = proc_dointvec_minmax, 98 .extra1 = &min_slot_table_size, 99 .extra2 = &max_slot_table_size 100 }, 101 { 102 .procname = "min_resvport", 103 .data = &xprt_min_resvport, 104 .maxlen = sizeof(unsigned int), 105 .mode = 0644, 106 .proc_handler = proc_dointvec_minmax, 107 .extra1 = &xprt_min_resvport_limit, 108 .extra2 = &xprt_max_resvport_limit 109 }, 110 { 111 .procname = "max_resvport", 112 .data = &xprt_max_resvport, 113 .maxlen = sizeof(unsigned int), 114 .mode = 0644, 115 .proc_handler = proc_dointvec_minmax, 116 .extra1 = &xprt_min_resvport_limit, 117 .extra2 = &xprt_max_resvport_limit 118 }, 119 { 120 .procname = "tcp_fin_timeout", 121 .data = &xs_tcp_fin_timeout, 122 .maxlen = sizeof(xs_tcp_fin_timeout), 123 .mode = 0644, 124 .proc_handler = proc_dointvec_jiffies, 125 }, 126 { }, 127 }; 128 129 static ctl_table sunrpc_table[] = { 130 { 131 .procname = "sunrpc", 132 .mode = 0555, 133 .child = xs_tunables_table 134 }, 135 { }, 136 }; 137 138 #endif 139 140 /* 141 * Wait duration for a reply from the RPC portmapper. 142 */ 143 #define XS_BIND_TO (60U * HZ) 144 145 /* 146 * Delay if a UDP socket connect error occurs. This is most likely some 147 * kind of resource problem on the local host. 148 */ 149 #define XS_UDP_REEST_TO (2U * HZ) 150 151 /* 152 * The reestablish timeout allows clients to delay for a bit before attempting 153 * to reconnect to a server that just dropped our connection. 154 * 155 * We implement an exponential backoff when trying to reestablish a TCP 156 * transport connection with the server. Some servers like to drop a TCP 157 * connection when they are overworked, so we start with a short timeout and 158 * increase over time if the server is down or not responding. 159 */ 160 #define XS_TCP_INIT_REEST_TO (3U * HZ) 161 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 162 163 /* 164 * TCP idle timeout; client drops the transport socket if it is idle 165 * for this long. Note that we also timeout UDP sockets to prevent 166 * holding port numbers when there is no RPC traffic. 167 */ 168 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 169 170 #ifdef RPC_DEBUG 171 # undef RPC_DEBUG_DATA 172 # define RPCDBG_FACILITY RPCDBG_TRANS 173 #endif 174 175 #ifdef RPC_DEBUG_DATA 176 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 177 { 178 u8 *buf = (u8 *) packet; 179 int j; 180 181 dprintk("RPC: %s\n", msg); 182 for (j = 0; j < count && j < 128; j += 4) { 183 if (!(j & 31)) { 184 if (j) 185 dprintk("\n"); 186 dprintk("0x%04x ", j); 187 } 188 dprintk("%02x%02x%02x%02x ", 189 buf[j], buf[j+1], buf[j+2], buf[j+3]); 190 } 191 dprintk("\n"); 192 } 193 #else 194 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 195 { 196 /* NOP */ 197 } 198 #endif 199 200 struct sock_xprt { 201 struct rpc_xprt xprt; 202 203 /* 204 * Network layer 205 */ 206 struct socket * sock; 207 struct sock * inet; 208 209 /* 210 * State of TCP reply receive 211 */ 212 __be32 tcp_fraghdr, 213 tcp_xid; 214 215 u32 tcp_offset, 216 tcp_reclen; 217 218 unsigned long tcp_copied, 219 tcp_flags; 220 221 /* 222 * Connection of transports 223 */ 224 struct delayed_work connect_worker; 225 struct sockaddr_storage srcaddr; 226 unsigned short srcport; 227 228 /* 229 * UDP socket buffer size parameters 230 */ 231 size_t rcvsize, 232 sndsize; 233 234 /* 235 * Saved socket callback addresses 236 */ 237 void (*old_data_ready)(struct sock *, int); 238 void (*old_state_change)(struct sock *); 239 void (*old_write_space)(struct sock *); 240 void (*old_error_report)(struct sock *); 241 }; 242 243 /* 244 * TCP receive state flags 245 */ 246 #define TCP_RCV_LAST_FRAG (1UL << 0) 247 #define TCP_RCV_COPY_FRAGHDR (1UL << 1) 248 #define TCP_RCV_COPY_XID (1UL << 2) 249 #define TCP_RCV_COPY_DATA (1UL << 3) 250 #define TCP_RCV_READ_CALLDIR (1UL << 4) 251 #define TCP_RCV_COPY_CALLDIR (1UL << 5) 252 253 /* 254 * TCP RPC flags 255 */ 256 #define TCP_RPC_REPLY (1UL << 6) 257 258 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 259 { 260 return (struct sockaddr *) &xprt->addr; 261 } 262 263 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 264 { 265 return (struct sockaddr_in *) &xprt->addr; 266 } 267 268 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 269 { 270 return (struct sockaddr_in6 *) &xprt->addr; 271 } 272 273 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 274 { 275 struct sockaddr *sap = xs_addr(xprt); 276 struct sockaddr_in6 *sin6; 277 struct sockaddr_in *sin; 278 char buf[128]; 279 280 (void)rpc_ntop(sap, buf, sizeof(buf)); 281 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); 282 283 switch (sap->sa_family) { 284 case AF_INET: 285 sin = xs_addr_in(xprt); 286 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 287 break; 288 case AF_INET6: 289 sin6 = xs_addr_in6(xprt); 290 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 291 break; 292 default: 293 BUG(); 294 } 295 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 296 } 297 298 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 299 { 300 struct sockaddr *sap = xs_addr(xprt); 301 char buf[128]; 302 303 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 304 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 305 306 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 307 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 308 } 309 310 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 311 const char *protocol, 312 const char *netid) 313 { 314 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 315 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 316 xs_format_common_peer_addresses(xprt); 317 xs_format_common_peer_ports(xprt); 318 } 319 320 static void xs_update_peer_port(struct rpc_xprt *xprt) 321 { 322 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 323 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 324 325 xs_format_common_peer_ports(xprt); 326 } 327 328 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 329 { 330 unsigned int i; 331 332 for (i = 0; i < RPC_DISPLAY_MAX; i++) 333 switch (i) { 334 case RPC_DISPLAY_PROTO: 335 case RPC_DISPLAY_NETID: 336 continue; 337 default: 338 kfree(xprt->address_strings[i]); 339 } 340 } 341 342 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 343 344 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 345 { 346 struct msghdr msg = { 347 .msg_name = addr, 348 .msg_namelen = addrlen, 349 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 350 }; 351 struct kvec iov = { 352 .iov_base = vec->iov_base + base, 353 .iov_len = vec->iov_len - base, 354 }; 355 356 if (iov.iov_len != 0) 357 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 358 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 359 } 360 361 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) 362 { 363 struct page **ppage; 364 unsigned int remainder; 365 int err, sent = 0; 366 367 remainder = xdr->page_len - base; 368 base += xdr->page_base; 369 ppage = xdr->pages + (base >> PAGE_SHIFT); 370 base &= ~PAGE_MASK; 371 for(;;) { 372 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 373 int flags = XS_SENDMSG_FLAGS; 374 375 remainder -= len; 376 if (remainder != 0 || more) 377 flags |= MSG_MORE; 378 err = sock->ops->sendpage(sock, *ppage, base, len, flags); 379 if (remainder == 0 || err != len) 380 break; 381 sent += err; 382 ppage++; 383 base = 0; 384 } 385 if (sent == 0) 386 return err; 387 if (err > 0) 388 sent += err; 389 return sent; 390 } 391 392 /** 393 * xs_sendpages - write pages directly to a socket 394 * @sock: socket to send on 395 * @addr: UDP only -- address of destination 396 * @addrlen: UDP only -- length of destination address 397 * @xdr: buffer containing this request 398 * @base: starting position in the buffer 399 * 400 */ 401 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 402 { 403 unsigned int remainder = xdr->len - base; 404 int err, sent = 0; 405 406 if (unlikely(!sock)) 407 return -ENOTSOCK; 408 409 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 410 if (base != 0) { 411 addr = NULL; 412 addrlen = 0; 413 } 414 415 if (base < xdr->head[0].iov_len || addr != NULL) { 416 unsigned int len = xdr->head[0].iov_len - base; 417 remainder -= len; 418 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 419 if (remainder == 0 || err != len) 420 goto out; 421 sent += err; 422 base = 0; 423 } else 424 base -= xdr->head[0].iov_len; 425 426 if (base < xdr->page_len) { 427 unsigned int len = xdr->page_len - base; 428 remainder -= len; 429 err = xs_send_pagedata(sock, xdr, base, remainder != 0); 430 if (remainder == 0 || err != len) 431 goto out; 432 sent += err; 433 base = 0; 434 } else 435 base -= xdr->page_len; 436 437 if (base >= xdr->tail[0].iov_len) 438 return sent; 439 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 440 out: 441 if (sent == 0) 442 return err; 443 if (err > 0) 444 sent += err; 445 return sent; 446 } 447 448 static void xs_nospace_callback(struct rpc_task *task) 449 { 450 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 451 452 transport->inet->sk_write_pending--; 453 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 454 } 455 456 /** 457 * xs_nospace - place task on wait queue if transmit was incomplete 458 * @task: task to put to sleep 459 * 460 */ 461 static int xs_nospace(struct rpc_task *task) 462 { 463 struct rpc_rqst *req = task->tk_rqstp; 464 struct rpc_xprt *xprt = req->rq_xprt; 465 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 466 int ret = 0; 467 468 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 469 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 470 req->rq_slen); 471 472 /* Protect against races with write_space */ 473 spin_lock_bh(&xprt->transport_lock); 474 475 /* Don't race with disconnect */ 476 if (xprt_connected(xprt)) { 477 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 478 ret = -EAGAIN; 479 /* 480 * Notify TCP that we're limited by the application 481 * window size 482 */ 483 set_bit(SOCK_NOSPACE, &transport->sock->flags); 484 transport->inet->sk_write_pending++; 485 /* ...and wait for more buffer space */ 486 xprt_wait_for_buffer_space(task, xs_nospace_callback); 487 } 488 } else { 489 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 490 ret = -ENOTCONN; 491 } 492 493 spin_unlock_bh(&xprt->transport_lock); 494 return ret; 495 } 496 497 /** 498 * xs_udp_send_request - write an RPC request to a UDP socket 499 * @task: address of RPC task that manages the state of an RPC request 500 * 501 * Return values: 502 * 0: The request has been sent 503 * EAGAIN: The socket was blocked, please call again later to 504 * complete the request 505 * ENOTCONN: Caller needs to invoke connect logic then call again 506 * other: Some other error occured, the request was not sent 507 */ 508 static int xs_udp_send_request(struct rpc_task *task) 509 { 510 struct rpc_rqst *req = task->tk_rqstp; 511 struct rpc_xprt *xprt = req->rq_xprt; 512 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 513 struct xdr_buf *xdr = &req->rq_snd_buf; 514 int status; 515 516 xs_pktdump("packet data:", 517 req->rq_svec->iov_base, 518 req->rq_svec->iov_len); 519 520 if (!xprt_bound(xprt)) 521 return -ENOTCONN; 522 status = xs_sendpages(transport->sock, 523 xs_addr(xprt), 524 xprt->addrlen, xdr, 525 req->rq_bytes_sent); 526 527 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 528 xdr->len - req->rq_bytes_sent, status); 529 530 if (status >= 0) { 531 req->rq_xmit_bytes_sent += status; 532 if (status >= req->rq_slen) 533 return 0; 534 /* Still some bytes left; set up for a retry later. */ 535 status = -EAGAIN; 536 } 537 538 switch (status) { 539 case -ENOTSOCK: 540 status = -ENOTCONN; 541 /* Should we call xs_close() here? */ 542 break; 543 case -EAGAIN: 544 status = xs_nospace(task); 545 break; 546 default: 547 dprintk("RPC: sendmsg returned unrecognized error %d\n", 548 -status); 549 case -ENETUNREACH: 550 case -EPIPE: 551 case -ECONNREFUSED: 552 /* When the server has died, an ICMP port unreachable message 553 * prompts ECONNREFUSED. */ 554 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 555 } 556 557 return status; 558 } 559 560 /** 561 * xs_tcp_shutdown - gracefully shut down a TCP socket 562 * @xprt: transport 563 * 564 * Initiates a graceful shutdown of the TCP socket by calling the 565 * equivalent of shutdown(SHUT_WR); 566 */ 567 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 568 { 569 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 570 struct socket *sock = transport->sock; 571 572 if (sock != NULL) 573 kernel_sock_shutdown(sock, SHUT_WR); 574 } 575 576 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 577 { 578 u32 reclen = buf->len - sizeof(rpc_fraghdr); 579 rpc_fraghdr *base = buf->head[0].iov_base; 580 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 581 } 582 583 /** 584 * xs_tcp_send_request - write an RPC request to a TCP socket 585 * @task: address of RPC task that manages the state of an RPC request 586 * 587 * Return values: 588 * 0: The request has been sent 589 * EAGAIN: The socket was blocked, please call again later to 590 * complete the request 591 * ENOTCONN: Caller needs to invoke connect logic then call again 592 * other: Some other error occured, the request was not sent 593 * 594 * XXX: In the case of soft timeouts, should we eventually give up 595 * if sendmsg is not able to make progress? 596 */ 597 static int xs_tcp_send_request(struct rpc_task *task) 598 { 599 struct rpc_rqst *req = task->tk_rqstp; 600 struct rpc_xprt *xprt = req->rq_xprt; 601 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 602 struct xdr_buf *xdr = &req->rq_snd_buf; 603 int status; 604 605 xs_encode_tcp_record_marker(&req->rq_snd_buf); 606 607 xs_pktdump("packet data:", 608 req->rq_svec->iov_base, 609 req->rq_svec->iov_len); 610 611 /* Continue transmitting the packet/record. We must be careful 612 * to cope with writespace callbacks arriving _after_ we have 613 * called sendmsg(). */ 614 while (1) { 615 status = xs_sendpages(transport->sock, 616 NULL, 0, xdr, req->rq_bytes_sent); 617 618 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 619 xdr->len - req->rq_bytes_sent, status); 620 621 if (unlikely(status < 0)) 622 break; 623 624 /* If we've sent the entire packet, immediately 625 * reset the count of bytes sent. */ 626 req->rq_bytes_sent += status; 627 req->rq_xmit_bytes_sent += status; 628 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 629 req->rq_bytes_sent = 0; 630 return 0; 631 } 632 633 if (status != 0) 634 continue; 635 status = -EAGAIN; 636 break; 637 } 638 639 switch (status) { 640 case -ENOTSOCK: 641 status = -ENOTCONN; 642 /* Should we call xs_close() here? */ 643 break; 644 case -EAGAIN: 645 status = xs_nospace(task); 646 break; 647 default: 648 dprintk("RPC: sendmsg returned unrecognized error %d\n", 649 -status); 650 case -ECONNRESET: 651 case -EPIPE: 652 xs_tcp_shutdown(xprt); 653 case -ECONNREFUSED: 654 case -ENOTCONN: 655 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 656 } 657 658 return status; 659 } 660 661 /** 662 * xs_tcp_release_xprt - clean up after a tcp transmission 663 * @xprt: transport 664 * @task: rpc task 665 * 666 * This cleans up if an error causes us to abort the transmission of a request. 667 * In this case, the socket may need to be reset in order to avoid confusing 668 * the server. 669 */ 670 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 671 { 672 struct rpc_rqst *req; 673 674 if (task != xprt->snd_task) 675 return; 676 if (task == NULL) 677 goto out_release; 678 req = task->tk_rqstp; 679 if (req->rq_bytes_sent == 0) 680 goto out_release; 681 if (req->rq_bytes_sent == req->rq_snd_buf.len) 682 goto out_release; 683 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); 684 out_release: 685 xprt_release_xprt(xprt, task); 686 } 687 688 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 689 { 690 transport->old_data_ready = sk->sk_data_ready; 691 transport->old_state_change = sk->sk_state_change; 692 transport->old_write_space = sk->sk_write_space; 693 transport->old_error_report = sk->sk_error_report; 694 } 695 696 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 697 { 698 sk->sk_data_ready = transport->old_data_ready; 699 sk->sk_state_change = transport->old_state_change; 700 sk->sk_write_space = transport->old_write_space; 701 sk->sk_error_report = transport->old_error_report; 702 } 703 704 static void xs_reset_transport(struct sock_xprt *transport) 705 { 706 struct socket *sock = transport->sock; 707 struct sock *sk = transport->inet; 708 709 if (sk == NULL) 710 return; 711 712 write_lock_bh(&sk->sk_callback_lock); 713 transport->inet = NULL; 714 transport->sock = NULL; 715 716 sk->sk_user_data = NULL; 717 718 xs_restore_old_callbacks(transport, sk); 719 write_unlock_bh(&sk->sk_callback_lock); 720 721 sk->sk_no_check = 0; 722 723 sock_release(sock); 724 } 725 726 /** 727 * xs_close - close a socket 728 * @xprt: transport 729 * 730 * This is used when all requests are complete; ie, no DRC state remains 731 * on the server we want to save. 732 * 733 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 734 * xs_reset_transport() zeroing the socket from underneath a writer. 735 */ 736 static void xs_close(struct rpc_xprt *xprt) 737 { 738 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 739 740 dprintk("RPC: xs_close xprt %p\n", xprt); 741 742 xs_reset_transport(transport); 743 xprt->reestablish_timeout = 0; 744 745 smp_mb__before_clear_bit(); 746 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 747 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 748 clear_bit(XPRT_CLOSING, &xprt->state); 749 smp_mb__after_clear_bit(); 750 xprt_disconnect_done(xprt); 751 } 752 753 static void xs_tcp_close(struct rpc_xprt *xprt) 754 { 755 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state)) 756 xs_close(xprt); 757 else 758 xs_tcp_shutdown(xprt); 759 } 760 761 /** 762 * xs_destroy - prepare to shutdown a transport 763 * @xprt: doomed transport 764 * 765 */ 766 static void xs_destroy(struct rpc_xprt *xprt) 767 { 768 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 769 770 dprintk("RPC: xs_destroy xprt %p\n", xprt); 771 772 cancel_rearming_delayed_work(&transport->connect_worker); 773 774 xs_close(xprt); 775 xs_free_peer_addresses(xprt); 776 kfree(xprt->slot); 777 kfree(xprt); 778 module_put(THIS_MODULE); 779 } 780 781 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 782 { 783 return (struct rpc_xprt *) sk->sk_user_data; 784 } 785 786 /** 787 * xs_udp_data_ready - "data ready" callback for UDP sockets 788 * @sk: socket with data to read 789 * @len: how much data to read 790 * 791 */ 792 static void xs_udp_data_ready(struct sock *sk, int len) 793 { 794 struct rpc_task *task; 795 struct rpc_xprt *xprt; 796 struct rpc_rqst *rovr; 797 struct sk_buff *skb; 798 int err, repsize, copied; 799 u32 _xid; 800 __be32 *xp; 801 802 read_lock(&sk->sk_callback_lock); 803 dprintk("RPC: xs_udp_data_ready...\n"); 804 if (!(xprt = xprt_from_sock(sk))) 805 goto out; 806 807 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 808 goto out; 809 810 if (xprt->shutdown) 811 goto dropit; 812 813 repsize = skb->len - sizeof(struct udphdr); 814 if (repsize < 4) { 815 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 816 goto dropit; 817 } 818 819 /* Copy the XID from the skb... */ 820 xp = skb_header_pointer(skb, sizeof(struct udphdr), 821 sizeof(_xid), &_xid); 822 if (xp == NULL) 823 goto dropit; 824 825 /* Look up and lock the request corresponding to the given XID */ 826 spin_lock(&xprt->transport_lock); 827 rovr = xprt_lookup_rqst(xprt, *xp); 828 if (!rovr) 829 goto out_unlock; 830 task = rovr->rq_task; 831 832 if ((copied = rovr->rq_private_buf.buflen) > repsize) 833 copied = repsize; 834 835 /* Suck it into the iovec, verify checksum if not done by hw. */ 836 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 837 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 838 goto out_unlock; 839 } 840 841 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 842 843 /* Something worked... */ 844 dst_confirm(skb_dst(skb)); 845 846 xprt_adjust_cwnd(task, copied); 847 xprt_complete_rqst(task, copied); 848 849 out_unlock: 850 spin_unlock(&xprt->transport_lock); 851 dropit: 852 skb_free_datagram(sk, skb); 853 out: 854 read_unlock(&sk->sk_callback_lock); 855 } 856 857 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 858 { 859 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 860 size_t len, used; 861 char *p; 862 863 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 864 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 865 used = xdr_skb_read_bits(desc, p, len); 866 transport->tcp_offset += used; 867 if (used != len) 868 return; 869 870 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 871 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 872 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 873 else 874 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 875 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 876 877 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 878 transport->tcp_offset = 0; 879 880 /* Sanity check of the record length */ 881 if (unlikely(transport->tcp_reclen < 8)) { 882 dprintk("RPC: invalid TCP record fragment length\n"); 883 xprt_force_disconnect(xprt); 884 return; 885 } 886 dprintk("RPC: reading TCP record fragment of length %d\n", 887 transport->tcp_reclen); 888 } 889 890 static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 891 { 892 if (transport->tcp_offset == transport->tcp_reclen) { 893 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 894 transport->tcp_offset = 0; 895 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 896 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 897 transport->tcp_flags |= TCP_RCV_COPY_XID; 898 transport->tcp_copied = 0; 899 } 900 } 901 } 902 903 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 904 { 905 size_t len, used; 906 char *p; 907 908 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 909 dprintk("RPC: reading XID (%Zu bytes)\n", len); 910 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 911 used = xdr_skb_read_bits(desc, p, len); 912 transport->tcp_offset += used; 913 if (used != len) 914 return; 915 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 916 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 917 transport->tcp_copied = 4; 918 dprintk("RPC: reading %s XID %08x\n", 919 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 920 : "request with", 921 ntohl(transport->tcp_xid)); 922 xs_tcp_check_fraghdr(transport); 923 } 924 925 static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 926 struct xdr_skb_reader *desc) 927 { 928 size_t len, used; 929 u32 offset; 930 __be32 calldir; 931 932 /* 933 * We want transport->tcp_offset to be 8 at the end of this routine 934 * (4 bytes for the xid and 4 bytes for the call/reply flag). 935 * When this function is called for the first time, 936 * transport->tcp_offset is 4 (after having already read the xid). 937 */ 938 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 939 len = sizeof(calldir) - offset; 940 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 941 used = xdr_skb_read_bits(desc, &calldir, len); 942 transport->tcp_offset += used; 943 if (used != len) 944 return; 945 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 946 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 947 transport->tcp_flags |= TCP_RCV_COPY_DATA; 948 /* 949 * We don't yet have the XDR buffer, so we will write the calldir 950 * out after we get the buffer from the 'struct rpc_rqst' 951 */ 952 if (ntohl(calldir) == RPC_REPLY) 953 transport->tcp_flags |= TCP_RPC_REPLY; 954 else 955 transport->tcp_flags &= ~TCP_RPC_REPLY; 956 dprintk("RPC: reading %s CALL/REPLY flag %08x\n", 957 (transport->tcp_flags & TCP_RPC_REPLY) ? 958 "reply for" : "request with", calldir); 959 xs_tcp_check_fraghdr(transport); 960 } 961 962 static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 963 struct xdr_skb_reader *desc, 964 struct rpc_rqst *req) 965 { 966 struct sock_xprt *transport = 967 container_of(xprt, struct sock_xprt, xprt); 968 struct xdr_buf *rcvbuf; 969 size_t len; 970 ssize_t r; 971 972 rcvbuf = &req->rq_private_buf; 973 974 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 975 /* 976 * Save the RPC direction in the XDR buffer 977 */ 978 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ? 979 htonl(RPC_REPLY) : 0; 980 981 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 982 &calldir, sizeof(calldir)); 983 transport->tcp_copied += sizeof(calldir); 984 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 985 } 986 987 len = desc->count; 988 if (len > transport->tcp_reclen - transport->tcp_offset) { 989 struct xdr_skb_reader my_desc; 990 991 len = transport->tcp_reclen - transport->tcp_offset; 992 memcpy(&my_desc, desc, sizeof(my_desc)); 993 my_desc.count = len; 994 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 995 &my_desc, xdr_skb_read_bits); 996 desc->count -= r; 997 desc->offset += r; 998 } else 999 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1000 desc, xdr_skb_read_bits); 1001 1002 if (r > 0) { 1003 transport->tcp_copied += r; 1004 transport->tcp_offset += r; 1005 } 1006 if (r != len) { 1007 /* Error when copying to the receive buffer, 1008 * usually because we weren't able to allocate 1009 * additional buffer pages. All we can do now 1010 * is turn off TCP_RCV_COPY_DATA, so the request 1011 * will not receive any additional updates, 1012 * and time out. 1013 * Any remaining data from this record will 1014 * be discarded. 1015 */ 1016 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1017 dprintk("RPC: XID %08x truncated request\n", 1018 ntohl(transport->tcp_xid)); 1019 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1020 "tcp_offset = %u, tcp_reclen = %u\n", 1021 xprt, transport->tcp_copied, 1022 transport->tcp_offset, transport->tcp_reclen); 1023 return; 1024 } 1025 1026 dprintk("RPC: XID %08x read %Zd bytes\n", 1027 ntohl(transport->tcp_xid), r); 1028 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1029 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1030 transport->tcp_offset, transport->tcp_reclen); 1031 1032 if (transport->tcp_copied == req->rq_private_buf.buflen) 1033 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1034 else if (transport->tcp_offset == transport->tcp_reclen) { 1035 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1036 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1037 } 1038 } 1039 1040 /* 1041 * Finds the request corresponding to the RPC xid and invokes the common 1042 * tcp read code to read the data. 1043 */ 1044 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1045 struct xdr_skb_reader *desc) 1046 { 1047 struct sock_xprt *transport = 1048 container_of(xprt, struct sock_xprt, xprt); 1049 struct rpc_rqst *req; 1050 1051 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1052 1053 /* Find and lock the request corresponding to this xid */ 1054 spin_lock(&xprt->transport_lock); 1055 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1056 if (!req) { 1057 dprintk("RPC: XID %08x request not found!\n", 1058 ntohl(transport->tcp_xid)); 1059 spin_unlock(&xprt->transport_lock); 1060 return -1; 1061 } 1062 1063 xs_tcp_read_common(xprt, desc, req); 1064 1065 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1066 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1067 1068 spin_unlock(&xprt->transport_lock); 1069 return 0; 1070 } 1071 1072 #if defined(CONFIG_NFS_V4_1) 1073 /* 1074 * Obtains an rpc_rqst previously allocated and invokes the common 1075 * tcp read code to read the data. The result is placed in the callback 1076 * queue. 1077 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1078 * connection and return -1. 1079 */ 1080 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt, 1081 struct xdr_skb_reader *desc) 1082 { 1083 struct sock_xprt *transport = 1084 container_of(xprt, struct sock_xprt, xprt); 1085 struct rpc_rqst *req; 1086 1087 req = xprt_alloc_bc_request(xprt); 1088 if (req == NULL) { 1089 printk(KERN_WARNING "Callback slot table overflowed\n"); 1090 xprt_force_disconnect(xprt); 1091 return -1; 1092 } 1093 1094 req->rq_xid = transport->tcp_xid; 1095 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1096 xs_tcp_read_common(xprt, desc, req); 1097 1098 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) { 1099 struct svc_serv *bc_serv = xprt->bc_serv; 1100 1101 /* 1102 * Add callback request to callback list. The callback 1103 * service sleeps on the sv_cb_waitq waiting for new 1104 * requests. Wake it up after adding enqueing the 1105 * request. 1106 */ 1107 dprintk("RPC: add callback request to list\n"); 1108 spin_lock(&bc_serv->sv_cb_lock); 1109 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list); 1110 spin_unlock(&bc_serv->sv_cb_lock); 1111 wake_up(&bc_serv->sv_cb_waitq); 1112 } 1113 1114 req->rq_private_buf.len = transport->tcp_copied; 1115 1116 return 0; 1117 } 1118 1119 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1120 struct xdr_skb_reader *desc) 1121 { 1122 struct sock_xprt *transport = 1123 container_of(xprt, struct sock_xprt, xprt); 1124 1125 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1126 xs_tcp_read_reply(xprt, desc) : 1127 xs_tcp_read_callback(xprt, desc); 1128 } 1129 #else 1130 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1131 struct xdr_skb_reader *desc) 1132 { 1133 return xs_tcp_read_reply(xprt, desc); 1134 } 1135 #endif /* CONFIG_NFS_V4_1 */ 1136 1137 /* 1138 * Read data off the transport. This can be either an RPC_CALL or an 1139 * RPC_REPLY. Relay the processing to helper functions. 1140 */ 1141 static void xs_tcp_read_data(struct rpc_xprt *xprt, 1142 struct xdr_skb_reader *desc) 1143 { 1144 struct sock_xprt *transport = 1145 container_of(xprt, struct sock_xprt, xprt); 1146 1147 if (_xs_tcp_read_data(xprt, desc) == 0) 1148 xs_tcp_check_fraghdr(transport); 1149 else { 1150 /* 1151 * The transport_lock protects the request handling. 1152 * There's no need to hold it to update the tcp_flags. 1153 */ 1154 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1155 } 1156 } 1157 1158 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1159 { 1160 size_t len; 1161 1162 len = transport->tcp_reclen - transport->tcp_offset; 1163 if (len > desc->count) 1164 len = desc->count; 1165 desc->count -= len; 1166 desc->offset += len; 1167 transport->tcp_offset += len; 1168 dprintk("RPC: discarded %Zu bytes\n", len); 1169 xs_tcp_check_fraghdr(transport); 1170 } 1171 1172 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1173 { 1174 struct rpc_xprt *xprt = rd_desc->arg.data; 1175 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1176 struct xdr_skb_reader desc = { 1177 .skb = skb, 1178 .offset = offset, 1179 .count = len, 1180 }; 1181 1182 dprintk("RPC: xs_tcp_data_recv started\n"); 1183 do { 1184 /* Read in a new fragment marker if necessary */ 1185 /* Can we ever really expect to get completely empty fragments? */ 1186 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1187 xs_tcp_read_fraghdr(xprt, &desc); 1188 continue; 1189 } 1190 /* Read in the xid if necessary */ 1191 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1192 xs_tcp_read_xid(transport, &desc); 1193 continue; 1194 } 1195 /* Read in the call/reply flag */ 1196 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1197 xs_tcp_read_calldir(transport, &desc); 1198 continue; 1199 } 1200 /* Read in the request data */ 1201 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1202 xs_tcp_read_data(xprt, &desc); 1203 continue; 1204 } 1205 /* Skip over any trailing bytes on short reads */ 1206 xs_tcp_read_discard(transport, &desc); 1207 } while (desc.count); 1208 dprintk("RPC: xs_tcp_data_recv done\n"); 1209 return len - desc.count; 1210 } 1211 1212 /** 1213 * xs_tcp_data_ready - "data ready" callback for TCP sockets 1214 * @sk: socket with data to read 1215 * @bytes: how much data to read 1216 * 1217 */ 1218 static void xs_tcp_data_ready(struct sock *sk, int bytes) 1219 { 1220 struct rpc_xprt *xprt; 1221 read_descriptor_t rd_desc; 1222 int read; 1223 1224 dprintk("RPC: xs_tcp_data_ready...\n"); 1225 1226 read_lock(&sk->sk_callback_lock); 1227 if (!(xprt = xprt_from_sock(sk))) 1228 goto out; 1229 if (xprt->shutdown) 1230 goto out; 1231 1232 /* Any data means we had a useful conversation, so 1233 * the we don't need to delay the next reconnect 1234 */ 1235 if (xprt->reestablish_timeout) 1236 xprt->reestablish_timeout = 0; 1237 1238 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1239 rd_desc.arg.data = xprt; 1240 do { 1241 rd_desc.count = 65536; 1242 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1243 } while (read > 0); 1244 out: 1245 read_unlock(&sk->sk_callback_lock); 1246 } 1247 1248 /* 1249 * Do the equivalent of linger/linger2 handling for dealing with 1250 * broken servers that don't close the socket in a timely 1251 * fashion 1252 */ 1253 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt, 1254 unsigned long timeout) 1255 { 1256 struct sock_xprt *transport; 1257 1258 if (xprt_test_and_set_connecting(xprt)) 1259 return; 1260 set_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1261 transport = container_of(xprt, struct sock_xprt, xprt); 1262 queue_delayed_work(rpciod_workqueue, &transport->connect_worker, 1263 timeout); 1264 } 1265 1266 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt) 1267 { 1268 struct sock_xprt *transport; 1269 1270 transport = container_of(xprt, struct sock_xprt, xprt); 1271 1272 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) || 1273 !cancel_delayed_work(&transport->connect_worker)) 1274 return; 1275 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1276 xprt_clear_connecting(xprt); 1277 } 1278 1279 static void xs_sock_mark_closed(struct rpc_xprt *xprt) 1280 { 1281 smp_mb__before_clear_bit(); 1282 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1283 clear_bit(XPRT_CLOSING, &xprt->state); 1284 smp_mb__after_clear_bit(); 1285 /* Mark transport as closed and wake up all pending tasks */ 1286 xprt_disconnect_done(xprt); 1287 } 1288 1289 /** 1290 * xs_tcp_state_change - callback to handle TCP socket state changes 1291 * @sk: socket whose state has changed 1292 * 1293 */ 1294 static void xs_tcp_state_change(struct sock *sk) 1295 { 1296 struct rpc_xprt *xprt; 1297 1298 read_lock(&sk->sk_callback_lock); 1299 if (!(xprt = xprt_from_sock(sk))) 1300 goto out; 1301 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1302 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 1303 sk->sk_state, xprt_connected(xprt), 1304 sock_flag(sk, SOCK_DEAD), 1305 sock_flag(sk, SOCK_ZAPPED)); 1306 1307 switch (sk->sk_state) { 1308 case TCP_ESTABLISHED: 1309 spin_lock_bh(&xprt->transport_lock); 1310 if (!xprt_test_and_set_connected(xprt)) { 1311 struct sock_xprt *transport = container_of(xprt, 1312 struct sock_xprt, xprt); 1313 1314 /* Reset TCP record info */ 1315 transport->tcp_offset = 0; 1316 transport->tcp_reclen = 0; 1317 transport->tcp_copied = 0; 1318 transport->tcp_flags = 1319 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1320 1321 xprt_wake_pending_tasks(xprt, -EAGAIN); 1322 } 1323 spin_unlock_bh(&xprt->transport_lock); 1324 break; 1325 case TCP_FIN_WAIT1: 1326 /* The client initiated a shutdown of the socket */ 1327 xprt->connect_cookie++; 1328 xprt->reestablish_timeout = 0; 1329 set_bit(XPRT_CLOSING, &xprt->state); 1330 smp_mb__before_clear_bit(); 1331 clear_bit(XPRT_CONNECTED, &xprt->state); 1332 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1333 smp_mb__after_clear_bit(); 1334 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1335 break; 1336 case TCP_CLOSE_WAIT: 1337 /* The server initiated a shutdown of the socket */ 1338 xprt_force_disconnect(xprt); 1339 case TCP_SYN_SENT: 1340 xprt->connect_cookie++; 1341 case TCP_CLOSING: 1342 /* 1343 * If the server closed down the connection, make sure that 1344 * we back off before reconnecting 1345 */ 1346 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1347 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1348 break; 1349 case TCP_LAST_ACK: 1350 set_bit(XPRT_CLOSING, &xprt->state); 1351 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout); 1352 smp_mb__before_clear_bit(); 1353 clear_bit(XPRT_CONNECTED, &xprt->state); 1354 smp_mb__after_clear_bit(); 1355 break; 1356 case TCP_CLOSE: 1357 xs_tcp_cancel_linger_timeout(xprt); 1358 xs_sock_mark_closed(xprt); 1359 } 1360 out: 1361 read_unlock(&sk->sk_callback_lock); 1362 } 1363 1364 /** 1365 * xs_error_report - callback mainly for catching socket errors 1366 * @sk: socket 1367 */ 1368 static void xs_error_report(struct sock *sk) 1369 { 1370 struct rpc_xprt *xprt; 1371 1372 read_lock(&sk->sk_callback_lock); 1373 if (!(xprt = xprt_from_sock(sk))) 1374 goto out; 1375 dprintk("RPC: %s client %p...\n" 1376 "RPC: error %d\n", 1377 __func__, xprt, sk->sk_err); 1378 xprt_wake_pending_tasks(xprt, -EAGAIN); 1379 out: 1380 read_unlock(&sk->sk_callback_lock); 1381 } 1382 1383 static void xs_write_space(struct sock *sk) 1384 { 1385 struct socket *sock; 1386 struct rpc_xprt *xprt; 1387 1388 if (unlikely(!(sock = sk->sk_socket))) 1389 return; 1390 clear_bit(SOCK_NOSPACE, &sock->flags); 1391 1392 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1393 return; 1394 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1395 return; 1396 1397 xprt_write_space(xprt); 1398 } 1399 1400 /** 1401 * xs_udp_write_space - callback invoked when socket buffer space 1402 * becomes available 1403 * @sk: socket whose state has changed 1404 * 1405 * Called when more output buffer space is available for this socket. 1406 * We try not to wake our writers until they can make "significant" 1407 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1408 * with a bunch of small requests. 1409 */ 1410 static void xs_udp_write_space(struct sock *sk) 1411 { 1412 read_lock(&sk->sk_callback_lock); 1413 1414 /* from net/core/sock.c:sock_def_write_space */ 1415 if (sock_writeable(sk)) 1416 xs_write_space(sk); 1417 1418 read_unlock(&sk->sk_callback_lock); 1419 } 1420 1421 /** 1422 * xs_tcp_write_space - callback invoked when socket buffer space 1423 * becomes available 1424 * @sk: socket whose state has changed 1425 * 1426 * Called when more output buffer space is available for this socket. 1427 * We try not to wake our writers until they can make "significant" 1428 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1429 * with a bunch of small requests. 1430 */ 1431 static void xs_tcp_write_space(struct sock *sk) 1432 { 1433 read_lock(&sk->sk_callback_lock); 1434 1435 /* from net/core/stream.c:sk_stream_write_space */ 1436 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) 1437 xs_write_space(sk); 1438 1439 read_unlock(&sk->sk_callback_lock); 1440 } 1441 1442 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1443 { 1444 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1445 struct sock *sk = transport->inet; 1446 1447 if (transport->rcvsize) { 1448 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1449 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1450 } 1451 if (transport->sndsize) { 1452 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1453 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1454 sk->sk_write_space(sk); 1455 } 1456 } 1457 1458 /** 1459 * xs_udp_set_buffer_size - set send and receive limits 1460 * @xprt: generic transport 1461 * @sndsize: requested size of send buffer, in bytes 1462 * @rcvsize: requested size of receive buffer, in bytes 1463 * 1464 * Set socket send and receive buffer size limits. 1465 */ 1466 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1467 { 1468 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1469 1470 transport->sndsize = 0; 1471 if (sndsize) 1472 transport->sndsize = sndsize + 1024; 1473 transport->rcvsize = 0; 1474 if (rcvsize) 1475 transport->rcvsize = rcvsize + 1024; 1476 1477 xs_udp_do_set_buffer_size(xprt); 1478 } 1479 1480 /** 1481 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1482 * @task: task that timed out 1483 * 1484 * Adjust the congestion window after a retransmit timeout has occurred. 1485 */ 1486 static void xs_udp_timer(struct rpc_task *task) 1487 { 1488 xprt_adjust_cwnd(task, -ETIMEDOUT); 1489 } 1490 1491 static unsigned short xs_get_random_port(void) 1492 { 1493 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1494 unsigned short rand = (unsigned short) net_random() % range; 1495 return rand + xprt_min_resvport; 1496 } 1497 1498 /** 1499 * xs_set_port - reset the port number in the remote endpoint address 1500 * @xprt: generic transport 1501 * @port: new port number 1502 * 1503 */ 1504 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1505 { 1506 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1507 1508 rpc_set_port(xs_addr(xprt), port); 1509 xs_update_peer_port(xprt); 1510 } 1511 1512 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock) 1513 { 1514 unsigned short port = transport->srcport; 1515 1516 if (port == 0 && transport->xprt.resvport) 1517 port = xs_get_random_port(); 1518 return port; 1519 } 1520 1521 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port) 1522 { 1523 if (transport->srcport != 0) 1524 transport->srcport = 0; 1525 if (!transport->xprt.resvport) 1526 return 0; 1527 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1528 return xprt_max_resvport; 1529 return --port; 1530 } 1531 1532 static int xs_bind4(struct sock_xprt *transport, struct socket *sock) 1533 { 1534 struct sockaddr_in myaddr = { 1535 .sin_family = AF_INET, 1536 }; 1537 struct sockaddr_in *sa; 1538 int err, nloop = 0; 1539 unsigned short port = xs_get_srcport(transport, sock); 1540 unsigned short last; 1541 1542 sa = (struct sockaddr_in *)&transport->srcaddr; 1543 myaddr.sin_addr = sa->sin_addr; 1544 do { 1545 myaddr.sin_port = htons(port); 1546 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1547 sizeof(myaddr)); 1548 if (port == 0) 1549 break; 1550 if (err == 0) { 1551 transport->srcport = port; 1552 break; 1553 } 1554 last = port; 1555 port = xs_next_srcport(transport, sock, port); 1556 if (port > last) 1557 nloop++; 1558 } while (err == -EADDRINUSE && nloop != 2); 1559 dprintk("RPC: %s %pI4:%u: %s (%d)\n", 1560 __func__, &myaddr.sin_addr, 1561 port, err ? "failed" : "ok", err); 1562 return err; 1563 } 1564 1565 static int xs_bind6(struct sock_xprt *transport, struct socket *sock) 1566 { 1567 struct sockaddr_in6 myaddr = { 1568 .sin6_family = AF_INET6, 1569 }; 1570 struct sockaddr_in6 *sa; 1571 int err, nloop = 0; 1572 unsigned short port = xs_get_srcport(transport, sock); 1573 unsigned short last; 1574 1575 sa = (struct sockaddr_in6 *)&transport->srcaddr; 1576 myaddr.sin6_addr = sa->sin6_addr; 1577 do { 1578 myaddr.sin6_port = htons(port); 1579 err = kernel_bind(sock, (struct sockaddr *) &myaddr, 1580 sizeof(myaddr)); 1581 if (port == 0) 1582 break; 1583 if (err == 0) { 1584 transport->srcport = port; 1585 break; 1586 } 1587 last = port; 1588 port = xs_next_srcport(transport, sock, port); 1589 if (port > last) 1590 nloop++; 1591 } while (err == -EADDRINUSE && nloop != 2); 1592 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n", 1593 &myaddr.sin6_addr, port, err ? "failed" : "ok", err); 1594 return err; 1595 } 1596 1597 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1598 static struct lock_class_key xs_key[2]; 1599 static struct lock_class_key xs_slock_key[2]; 1600 1601 static inline void xs_reclassify_socket4(struct socket *sock) 1602 { 1603 struct sock *sk = sock->sk; 1604 1605 BUG_ON(sock_owned_by_user(sk)); 1606 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1607 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1608 } 1609 1610 static inline void xs_reclassify_socket6(struct socket *sock) 1611 { 1612 struct sock *sk = sock->sk; 1613 1614 BUG_ON(sock_owned_by_user(sk)); 1615 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1616 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1617 } 1618 #else 1619 static inline void xs_reclassify_socket4(struct socket *sock) 1620 { 1621 } 1622 1623 static inline void xs_reclassify_socket6(struct socket *sock) 1624 { 1625 } 1626 #endif 1627 1628 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1629 { 1630 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1631 1632 if (!transport->inet) { 1633 struct sock *sk = sock->sk; 1634 1635 write_lock_bh(&sk->sk_callback_lock); 1636 1637 xs_save_old_callbacks(transport, sk); 1638 1639 sk->sk_user_data = xprt; 1640 sk->sk_data_ready = xs_udp_data_ready; 1641 sk->sk_write_space = xs_udp_write_space; 1642 sk->sk_error_report = xs_error_report; 1643 sk->sk_no_check = UDP_CSUM_NORCV; 1644 sk->sk_allocation = GFP_ATOMIC; 1645 1646 xprt_set_connected(xprt); 1647 1648 /* Reset to new socket */ 1649 transport->sock = sock; 1650 transport->inet = sk; 1651 1652 write_unlock_bh(&sk->sk_callback_lock); 1653 } 1654 xs_udp_do_set_buffer_size(xprt); 1655 } 1656 1657 /** 1658 * xs_udp_connect_worker4 - set up a UDP socket 1659 * @work: RPC transport to connect 1660 * 1661 * Invoked by a work queue tasklet. 1662 */ 1663 static void xs_udp_connect_worker4(struct work_struct *work) 1664 { 1665 struct sock_xprt *transport = 1666 container_of(work, struct sock_xprt, connect_worker.work); 1667 struct rpc_xprt *xprt = &transport->xprt; 1668 struct socket *sock = transport->sock; 1669 int err, status = -EIO; 1670 1671 if (xprt->shutdown) 1672 goto out; 1673 1674 /* Start by resetting any existing state */ 1675 xs_reset_transport(transport); 1676 1677 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock); 1678 if (err < 0) { 1679 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1680 goto out; 1681 } 1682 xs_reclassify_socket4(sock); 1683 1684 if (xs_bind4(transport, sock)) { 1685 sock_release(sock); 1686 goto out; 1687 } 1688 1689 dprintk("RPC: worker connecting xprt %p via %s to " 1690 "%s (port %s)\n", xprt, 1691 xprt->address_strings[RPC_DISPLAY_PROTO], 1692 xprt->address_strings[RPC_DISPLAY_ADDR], 1693 xprt->address_strings[RPC_DISPLAY_PORT]); 1694 1695 xs_udp_finish_connecting(xprt, sock); 1696 status = 0; 1697 out: 1698 xprt_clear_connecting(xprt); 1699 xprt_wake_pending_tasks(xprt, status); 1700 } 1701 1702 /** 1703 * xs_udp_connect_worker6 - set up a UDP socket 1704 * @work: RPC transport to connect 1705 * 1706 * Invoked by a work queue tasklet. 1707 */ 1708 static void xs_udp_connect_worker6(struct work_struct *work) 1709 { 1710 struct sock_xprt *transport = 1711 container_of(work, struct sock_xprt, connect_worker.work); 1712 struct rpc_xprt *xprt = &transport->xprt; 1713 struct socket *sock = transport->sock; 1714 int err, status = -EIO; 1715 1716 if (xprt->shutdown) 1717 goto out; 1718 1719 /* Start by resetting any existing state */ 1720 xs_reset_transport(transport); 1721 1722 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock); 1723 if (err < 0) { 1724 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1725 goto out; 1726 } 1727 xs_reclassify_socket6(sock); 1728 1729 if (xs_bind6(transport, sock) < 0) { 1730 sock_release(sock); 1731 goto out; 1732 } 1733 1734 dprintk("RPC: worker connecting xprt %p via %s to " 1735 "%s (port %s)\n", xprt, 1736 xprt->address_strings[RPC_DISPLAY_PROTO], 1737 xprt->address_strings[RPC_DISPLAY_ADDR], 1738 xprt->address_strings[RPC_DISPLAY_PORT]); 1739 1740 xs_udp_finish_connecting(xprt, sock); 1741 status = 0; 1742 out: 1743 xprt_clear_connecting(xprt); 1744 xprt_wake_pending_tasks(xprt, status); 1745 } 1746 1747 /* 1748 * We need to preserve the port number so the reply cache on the server can 1749 * find our cached RPC replies when we get around to reconnecting. 1750 */ 1751 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) 1752 { 1753 int result; 1754 struct sockaddr any; 1755 1756 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1757 1758 /* 1759 * Disconnect the transport socket by doing a connect operation 1760 * with AF_UNSPEC. This should return immediately... 1761 */ 1762 memset(&any, 0, sizeof(any)); 1763 any.sa_family = AF_UNSPEC; 1764 result = kernel_connect(transport->sock, &any, sizeof(any), 0); 1765 if (!result) 1766 xs_sock_mark_closed(xprt); 1767 else 1768 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1769 result); 1770 } 1771 1772 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport) 1773 { 1774 unsigned int state = transport->inet->sk_state; 1775 1776 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) 1777 return; 1778 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) 1779 return; 1780 xs_abort_connection(xprt, transport); 1781 } 1782 1783 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 1784 { 1785 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1786 1787 if (!transport->inet) { 1788 struct sock *sk = sock->sk; 1789 1790 write_lock_bh(&sk->sk_callback_lock); 1791 1792 xs_save_old_callbacks(transport, sk); 1793 1794 sk->sk_user_data = xprt; 1795 sk->sk_data_ready = xs_tcp_data_ready; 1796 sk->sk_state_change = xs_tcp_state_change; 1797 sk->sk_write_space = xs_tcp_write_space; 1798 sk->sk_error_report = xs_error_report; 1799 sk->sk_allocation = GFP_ATOMIC; 1800 1801 /* socket options */ 1802 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1803 sock_reset_flag(sk, SOCK_LINGER); 1804 tcp_sk(sk)->linger2 = 0; 1805 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1806 1807 xprt_clear_connected(xprt); 1808 1809 /* Reset to new socket */ 1810 transport->sock = sock; 1811 transport->inet = sk; 1812 1813 write_unlock_bh(&sk->sk_callback_lock); 1814 } 1815 1816 if (!xprt_bound(xprt)) 1817 return -ENOTCONN; 1818 1819 /* Tell the socket layer to start connecting... */ 1820 xprt->stat.connect_count++; 1821 xprt->stat.connect_start = jiffies; 1822 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 1823 } 1824 1825 /** 1826 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 1827 * @xprt: RPC transport to connect 1828 * @transport: socket transport to connect 1829 * @create_sock: function to create a socket of the correct type 1830 * 1831 * Invoked by a work queue tasklet. 1832 */ 1833 static void xs_tcp_setup_socket(struct rpc_xprt *xprt, 1834 struct sock_xprt *transport, 1835 struct socket *(*create_sock)(struct rpc_xprt *, 1836 struct sock_xprt *)) 1837 { 1838 struct socket *sock = transport->sock; 1839 int status = -EIO; 1840 1841 if (xprt->shutdown) 1842 goto out; 1843 1844 if (!sock) { 1845 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state); 1846 sock = create_sock(xprt, transport); 1847 if (IS_ERR(sock)) { 1848 status = PTR_ERR(sock); 1849 goto out; 1850 } 1851 } else { 1852 int abort_and_exit; 1853 1854 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT, 1855 &xprt->state); 1856 /* "close" the socket, preserving the local port */ 1857 xs_tcp_reuse_connection(xprt, transport); 1858 1859 if (abort_and_exit) 1860 goto out_eagain; 1861 } 1862 1863 dprintk("RPC: worker connecting xprt %p via %s to " 1864 "%s (port %s)\n", xprt, 1865 xprt->address_strings[RPC_DISPLAY_PROTO], 1866 xprt->address_strings[RPC_DISPLAY_ADDR], 1867 xprt->address_strings[RPC_DISPLAY_PORT]); 1868 1869 status = xs_tcp_finish_connecting(xprt, sock); 1870 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1871 xprt, -status, xprt_connected(xprt), 1872 sock->sk->sk_state); 1873 switch (status) { 1874 default: 1875 printk("%s: connect returned unhandled error %d\n", 1876 __func__, status); 1877 case -EADDRNOTAVAIL: 1878 /* We're probably in TIME_WAIT. Get rid of existing socket, 1879 * and retry 1880 */ 1881 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); 1882 xprt_force_disconnect(xprt); 1883 break; 1884 case -ECONNREFUSED: 1885 case -ECONNRESET: 1886 case -ENETUNREACH: 1887 /* retry with existing socket, after a delay */ 1888 case 0: 1889 case -EINPROGRESS: 1890 case -EALREADY: 1891 xprt_clear_connecting(xprt); 1892 return; 1893 case -EINVAL: 1894 /* Happens, for instance, if the user specified a link 1895 * local IPv6 address without a scope-id. 1896 */ 1897 goto out; 1898 } 1899 out_eagain: 1900 status = -EAGAIN; 1901 out: 1902 xprt_clear_connecting(xprt); 1903 xprt_wake_pending_tasks(xprt, status); 1904 } 1905 1906 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt, 1907 struct sock_xprt *transport) 1908 { 1909 struct socket *sock; 1910 int err; 1911 1912 /* start from scratch */ 1913 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); 1914 if (err < 0) { 1915 dprintk("RPC: can't create TCP transport socket (%d).\n", 1916 -err); 1917 goto out_err; 1918 } 1919 xs_reclassify_socket4(sock); 1920 1921 if (xs_bind4(transport, sock) < 0) { 1922 sock_release(sock); 1923 goto out_err; 1924 } 1925 return sock; 1926 out_err: 1927 return ERR_PTR(-EIO); 1928 } 1929 1930 /** 1931 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint 1932 * @work: RPC transport to connect 1933 * 1934 * Invoked by a work queue tasklet. 1935 */ 1936 static void xs_tcp_connect_worker4(struct work_struct *work) 1937 { 1938 struct sock_xprt *transport = 1939 container_of(work, struct sock_xprt, connect_worker.work); 1940 struct rpc_xprt *xprt = &transport->xprt; 1941 1942 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4); 1943 } 1944 1945 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt, 1946 struct sock_xprt *transport) 1947 { 1948 struct socket *sock; 1949 int err; 1950 1951 /* start from scratch */ 1952 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock); 1953 if (err < 0) { 1954 dprintk("RPC: can't create TCP transport socket (%d).\n", 1955 -err); 1956 goto out_err; 1957 } 1958 xs_reclassify_socket6(sock); 1959 1960 if (xs_bind6(transport, sock) < 0) { 1961 sock_release(sock); 1962 goto out_err; 1963 } 1964 return sock; 1965 out_err: 1966 return ERR_PTR(-EIO); 1967 } 1968 1969 /** 1970 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint 1971 * @work: RPC transport to connect 1972 * 1973 * Invoked by a work queue tasklet. 1974 */ 1975 static void xs_tcp_connect_worker6(struct work_struct *work) 1976 { 1977 struct sock_xprt *transport = 1978 container_of(work, struct sock_xprt, connect_worker.work); 1979 struct rpc_xprt *xprt = &transport->xprt; 1980 1981 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6); 1982 } 1983 1984 /** 1985 * xs_connect - connect a socket to a remote endpoint 1986 * @task: address of RPC task that manages state of connect request 1987 * 1988 * TCP: If the remote end dropped the connection, delay reconnecting. 1989 * 1990 * UDP socket connects are synchronous, but we use a work queue anyway 1991 * to guarantee that even unprivileged user processes can set up a 1992 * socket on a privileged port. 1993 * 1994 * If a UDP socket connect fails, the delay behavior here prevents 1995 * retry floods (hard mounts). 1996 */ 1997 static void xs_connect(struct rpc_task *task) 1998 { 1999 struct rpc_xprt *xprt = task->tk_xprt; 2000 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2001 2002 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) { 2003 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2004 "seconds\n", 2005 xprt, xprt->reestablish_timeout / HZ); 2006 queue_delayed_work(rpciod_workqueue, 2007 &transport->connect_worker, 2008 xprt->reestablish_timeout); 2009 xprt->reestablish_timeout <<= 1; 2010 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2011 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2012 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2013 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2014 } else { 2015 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2016 queue_delayed_work(rpciod_workqueue, 2017 &transport->connect_worker, 0); 2018 } 2019 } 2020 2021 /** 2022 * xs_udp_print_stats - display UDP socket-specifc stats 2023 * @xprt: rpc_xprt struct containing statistics 2024 * @seq: output file 2025 * 2026 */ 2027 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2028 { 2029 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2030 2031 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 2032 transport->srcport, 2033 xprt->stat.bind_count, 2034 xprt->stat.sends, 2035 xprt->stat.recvs, 2036 xprt->stat.bad_xids, 2037 xprt->stat.req_u, 2038 xprt->stat.bklog_u); 2039 } 2040 2041 /** 2042 * xs_tcp_print_stats - display TCP socket-specifc stats 2043 * @xprt: rpc_xprt struct containing statistics 2044 * @seq: output file 2045 * 2046 */ 2047 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2048 { 2049 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2050 long idle_time = 0; 2051 2052 if (xprt_connected(xprt)) 2053 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2054 2055 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 2056 transport->srcport, 2057 xprt->stat.bind_count, 2058 xprt->stat.connect_count, 2059 xprt->stat.connect_time, 2060 idle_time, 2061 xprt->stat.sends, 2062 xprt->stat.recvs, 2063 xprt->stat.bad_xids, 2064 xprt->stat.req_u, 2065 xprt->stat.bklog_u); 2066 } 2067 2068 /* 2069 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2070 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2071 * to use the server side send routines. 2072 */ 2073 static void *bc_malloc(struct rpc_task *task, size_t size) 2074 { 2075 struct page *page; 2076 struct rpc_buffer *buf; 2077 2078 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2079 page = alloc_page(GFP_KERNEL); 2080 2081 if (!page) 2082 return NULL; 2083 2084 buf = page_address(page); 2085 buf->len = PAGE_SIZE; 2086 2087 return buf->data; 2088 } 2089 2090 /* 2091 * Free the space allocated in the bc_alloc routine 2092 */ 2093 static void bc_free(void *buffer) 2094 { 2095 struct rpc_buffer *buf; 2096 2097 if (!buffer) 2098 return; 2099 2100 buf = container_of(buffer, struct rpc_buffer, data); 2101 free_page((unsigned long)buf); 2102 } 2103 2104 /* 2105 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2106 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2107 */ 2108 static int bc_sendto(struct rpc_rqst *req) 2109 { 2110 int len; 2111 struct xdr_buf *xbufp = &req->rq_snd_buf; 2112 struct rpc_xprt *xprt = req->rq_xprt; 2113 struct sock_xprt *transport = 2114 container_of(xprt, struct sock_xprt, xprt); 2115 struct socket *sock = transport->sock; 2116 unsigned long headoff; 2117 unsigned long tailoff; 2118 2119 /* 2120 * Set up the rpc header and record marker stuff 2121 */ 2122 xs_encode_tcp_record_marker(xbufp); 2123 2124 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2125 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2126 len = svc_send_common(sock, xbufp, 2127 virt_to_page(xbufp->head[0].iov_base), headoff, 2128 xbufp->tail[0].iov_base, tailoff); 2129 2130 if (len != xbufp->len) { 2131 printk(KERN_NOTICE "Error sending entire callback!\n"); 2132 len = -EAGAIN; 2133 } 2134 2135 return len; 2136 } 2137 2138 /* 2139 * The send routine. Borrows from svc_send 2140 */ 2141 static int bc_send_request(struct rpc_task *task) 2142 { 2143 struct rpc_rqst *req = task->tk_rqstp; 2144 struct svc_xprt *xprt; 2145 struct svc_sock *svsk; 2146 u32 len; 2147 2148 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2149 /* 2150 * Get the server socket associated with this callback xprt 2151 */ 2152 xprt = req->rq_xprt->bc_xprt; 2153 svsk = container_of(xprt, struct svc_sock, sk_xprt); 2154 2155 /* 2156 * Grab the mutex to serialize data as the connection is shared 2157 * with the fore channel 2158 */ 2159 if (!mutex_trylock(&xprt->xpt_mutex)) { 2160 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2161 if (!mutex_trylock(&xprt->xpt_mutex)) 2162 return -EAGAIN; 2163 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2164 } 2165 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2166 len = -ENOTCONN; 2167 else 2168 len = bc_sendto(req); 2169 mutex_unlock(&xprt->xpt_mutex); 2170 2171 if (len > 0) 2172 len = 0; 2173 2174 return len; 2175 } 2176 2177 /* 2178 * The close routine. Since this is client initiated, we do nothing 2179 */ 2180 2181 static void bc_close(struct rpc_xprt *xprt) 2182 { 2183 } 2184 2185 /* 2186 * The xprt destroy routine. Again, because this connection is client 2187 * initiated, we do nothing 2188 */ 2189 2190 static void bc_destroy(struct rpc_xprt *xprt) 2191 { 2192 } 2193 2194 static struct rpc_xprt_ops xs_udp_ops = { 2195 .set_buffer_size = xs_udp_set_buffer_size, 2196 .reserve_xprt = xprt_reserve_xprt_cong, 2197 .release_xprt = xprt_release_xprt_cong, 2198 .rpcbind = rpcb_getport_async, 2199 .set_port = xs_set_port, 2200 .connect = xs_connect, 2201 .buf_alloc = rpc_malloc, 2202 .buf_free = rpc_free, 2203 .send_request = xs_udp_send_request, 2204 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2205 .timer = xs_udp_timer, 2206 .release_request = xprt_release_rqst_cong, 2207 .close = xs_close, 2208 .destroy = xs_destroy, 2209 .print_stats = xs_udp_print_stats, 2210 }; 2211 2212 static struct rpc_xprt_ops xs_tcp_ops = { 2213 .reserve_xprt = xprt_reserve_xprt, 2214 .release_xprt = xs_tcp_release_xprt, 2215 .rpcbind = rpcb_getport_async, 2216 .set_port = xs_set_port, 2217 .connect = xs_connect, 2218 .buf_alloc = rpc_malloc, 2219 .buf_free = rpc_free, 2220 .send_request = xs_tcp_send_request, 2221 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2222 .close = xs_tcp_close, 2223 .destroy = xs_destroy, 2224 .print_stats = xs_tcp_print_stats, 2225 }; 2226 2227 /* 2228 * The rpc_xprt_ops for the server backchannel 2229 */ 2230 2231 static struct rpc_xprt_ops bc_tcp_ops = { 2232 .reserve_xprt = xprt_reserve_xprt, 2233 .release_xprt = xprt_release_xprt, 2234 .buf_alloc = bc_malloc, 2235 .buf_free = bc_free, 2236 .send_request = bc_send_request, 2237 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2238 .close = bc_close, 2239 .destroy = bc_destroy, 2240 .print_stats = xs_tcp_print_stats, 2241 }; 2242 2243 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2244 unsigned int slot_table_size) 2245 { 2246 struct rpc_xprt *xprt; 2247 struct sock_xprt *new; 2248 2249 if (args->addrlen > sizeof(xprt->addr)) { 2250 dprintk("RPC: xs_setup_xprt: address too large\n"); 2251 return ERR_PTR(-EBADF); 2252 } 2253 2254 new = kzalloc(sizeof(*new), GFP_KERNEL); 2255 if (new == NULL) { 2256 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2257 "rpc_xprt\n"); 2258 return ERR_PTR(-ENOMEM); 2259 } 2260 xprt = &new->xprt; 2261 2262 xprt->max_reqs = slot_table_size; 2263 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); 2264 if (xprt->slot == NULL) { 2265 kfree(xprt); 2266 dprintk("RPC: xs_setup_xprt: couldn't allocate slot " 2267 "table\n"); 2268 return ERR_PTR(-ENOMEM); 2269 } 2270 2271 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2272 xprt->addrlen = args->addrlen; 2273 if (args->srcaddr) 2274 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2275 2276 return xprt; 2277 } 2278 2279 static const struct rpc_timeout xs_udp_default_timeout = { 2280 .to_initval = 5 * HZ, 2281 .to_maxval = 30 * HZ, 2282 .to_increment = 5 * HZ, 2283 .to_retries = 5, 2284 }; 2285 2286 /** 2287 * xs_setup_udp - Set up transport to use a UDP socket 2288 * @args: rpc transport creation arguments 2289 * 2290 */ 2291 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2292 { 2293 struct sockaddr *addr = args->dstaddr; 2294 struct rpc_xprt *xprt; 2295 struct sock_xprt *transport; 2296 struct rpc_xprt *ret; 2297 2298 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); 2299 if (IS_ERR(xprt)) 2300 return xprt; 2301 transport = container_of(xprt, struct sock_xprt, xprt); 2302 2303 xprt->prot = IPPROTO_UDP; 2304 xprt->tsh_size = 0; 2305 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2306 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2307 2308 xprt->bind_timeout = XS_BIND_TO; 2309 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2310 xprt->idle_timeout = XS_IDLE_DISC_TO; 2311 2312 xprt->ops = &xs_udp_ops; 2313 2314 xprt->timeout = &xs_udp_default_timeout; 2315 2316 switch (addr->sa_family) { 2317 case AF_INET: 2318 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2319 xprt_set_bound(xprt); 2320 2321 INIT_DELAYED_WORK(&transport->connect_worker, 2322 xs_udp_connect_worker4); 2323 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2324 break; 2325 case AF_INET6: 2326 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2327 xprt_set_bound(xprt); 2328 2329 INIT_DELAYED_WORK(&transport->connect_worker, 2330 xs_udp_connect_worker6); 2331 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2332 break; 2333 default: 2334 ret = ERR_PTR(-EAFNOSUPPORT); 2335 goto out_err; 2336 } 2337 2338 if (xprt_bound(xprt)) 2339 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2340 xprt->address_strings[RPC_DISPLAY_ADDR], 2341 xprt->address_strings[RPC_DISPLAY_PORT], 2342 xprt->address_strings[RPC_DISPLAY_PROTO]); 2343 else 2344 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2345 xprt->address_strings[RPC_DISPLAY_ADDR], 2346 xprt->address_strings[RPC_DISPLAY_PROTO]); 2347 2348 if (try_module_get(THIS_MODULE)) 2349 return xprt; 2350 ret = ERR_PTR(-EINVAL); 2351 out_err: 2352 kfree(xprt->slot); 2353 kfree(xprt); 2354 return ret; 2355 } 2356 2357 static const struct rpc_timeout xs_tcp_default_timeout = { 2358 .to_initval = 60 * HZ, 2359 .to_maxval = 60 * HZ, 2360 .to_retries = 2, 2361 }; 2362 2363 /** 2364 * xs_setup_tcp - Set up transport to use a TCP socket 2365 * @args: rpc transport creation arguments 2366 * 2367 */ 2368 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2369 { 2370 struct sockaddr *addr = args->dstaddr; 2371 struct rpc_xprt *xprt; 2372 struct sock_xprt *transport; 2373 struct rpc_xprt *ret; 2374 2375 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2376 if (IS_ERR(xprt)) 2377 return xprt; 2378 transport = container_of(xprt, struct sock_xprt, xprt); 2379 2380 xprt->prot = IPPROTO_TCP; 2381 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2382 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2383 2384 xprt->bind_timeout = XS_BIND_TO; 2385 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2386 xprt->idle_timeout = XS_IDLE_DISC_TO; 2387 2388 xprt->ops = &xs_tcp_ops; 2389 xprt->timeout = &xs_tcp_default_timeout; 2390 2391 switch (addr->sa_family) { 2392 case AF_INET: 2393 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2394 xprt_set_bound(xprt); 2395 2396 INIT_DELAYED_WORK(&transport->connect_worker, 2397 xs_tcp_connect_worker4); 2398 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2399 break; 2400 case AF_INET6: 2401 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2402 xprt_set_bound(xprt); 2403 2404 INIT_DELAYED_WORK(&transport->connect_worker, 2405 xs_tcp_connect_worker6); 2406 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2407 break; 2408 default: 2409 ret = ERR_PTR(-EAFNOSUPPORT); 2410 goto out_err; 2411 } 2412 2413 if (xprt_bound(xprt)) 2414 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2415 xprt->address_strings[RPC_DISPLAY_ADDR], 2416 xprt->address_strings[RPC_DISPLAY_PORT], 2417 xprt->address_strings[RPC_DISPLAY_PROTO]); 2418 else 2419 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2420 xprt->address_strings[RPC_DISPLAY_ADDR], 2421 xprt->address_strings[RPC_DISPLAY_PROTO]); 2422 2423 2424 if (try_module_get(THIS_MODULE)) 2425 return xprt; 2426 ret = ERR_PTR(-EINVAL); 2427 out_err: 2428 kfree(xprt->slot); 2429 kfree(xprt); 2430 return ret; 2431 } 2432 2433 /** 2434 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2435 * @args: rpc transport creation arguments 2436 * 2437 */ 2438 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2439 { 2440 struct sockaddr *addr = args->dstaddr; 2441 struct rpc_xprt *xprt; 2442 struct sock_xprt *transport; 2443 struct svc_sock *bc_sock; 2444 struct rpc_xprt *ret; 2445 2446 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); 2447 if (IS_ERR(xprt)) 2448 return xprt; 2449 transport = container_of(xprt, struct sock_xprt, xprt); 2450 2451 xprt->prot = IPPROTO_TCP; 2452 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2453 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2454 xprt->timeout = &xs_tcp_default_timeout; 2455 2456 /* backchannel */ 2457 xprt_set_bound(xprt); 2458 xprt->bind_timeout = 0; 2459 xprt->reestablish_timeout = 0; 2460 xprt->idle_timeout = 0; 2461 2462 /* 2463 * The backchannel uses the same socket connection as the 2464 * forechannel 2465 */ 2466 xprt->bc_xprt = args->bc_xprt; 2467 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2468 bc_sock->sk_bc_xprt = xprt; 2469 transport->sock = bc_sock->sk_sock; 2470 transport->inet = bc_sock->sk_sk; 2471 2472 xprt->ops = &bc_tcp_ops; 2473 2474 switch (addr->sa_family) { 2475 case AF_INET: 2476 xs_format_peer_addresses(xprt, "tcp", 2477 RPCBIND_NETID_TCP); 2478 break; 2479 case AF_INET6: 2480 xs_format_peer_addresses(xprt, "tcp", 2481 RPCBIND_NETID_TCP6); 2482 break; 2483 default: 2484 ret = ERR_PTR(-EAFNOSUPPORT); 2485 goto out_err; 2486 } 2487 2488 if (xprt_bound(xprt)) 2489 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2490 xprt->address_strings[RPC_DISPLAY_ADDR], 2491 xprt->address_strings[RPC_DISPLAY_PORT], 2492 xprt->address_strings[RPC_DISPLAY_PROTO]); 2493 else 2494 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2495 xprt->address_strings[RPC_DISPLAY_ADDR], 2496 xprt->address_strings[RPC_DISPLAY_PROTO]); 2497 2498 /* 2499 * Since we don't want connections for the backchannel, we set 2500 * the xprt status to connected 2501 */ 2502 xprt_set_connected(xprt); 2503 2504 2505 if (try_module_get(THIS_MODULE)) 2506 return xprt; 2507 ret = ERR_PTR(-EINVAL); 2508 out_err: 2509 kfree(xprt->slot); 2510 kfree(xprt); 2511 return ret; 2512 } 2513 2514 static struct xprt_class xs_udp_transport = { 2515 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2516 .name = "udp", 2517 .owner = THIS_MODULE, 2518 .ident = XPRT_TRANSPORT_UDP, 2519 .setup = xs_setup_udp, 2520 }; 2521 2522 static struct xprt_class xs_tcp_transport = { 2523 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2524 .name = "tcp", 2525 .owner = THIS_MODULE, 2526 .ident = XPRT_TRANSPORT_TCP, 2527 .setup = xs_setup_tcp, 2528 }; 2529 2530 static struct xprt_class xs_bc_tcp_transport = { 2531 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2532 .name = "tcp NFSv4.1 backchannel", 2533 .owner = THIS_MODULE, 2534 .ident = XPRT_TRANSPORT_BC_TCP, 2535 .setup = xs_setup_bc_tcp, 2536 }; 2537 2538 /** 2539 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2540 * 2541 */ 2542 int init_socket_xprt(void) 2543 { 2544 #ifdef RPC_DEBUG 2545 if (!sunrpc_table_header) 2546 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2547 #endif 2548 2549 xprt_register_transport(&xs_udp_transport); 2550 xprt_register_transport(&xs_tcp_transport); 2551 xprt_register_transport(&xs_bc_tcp_transport); 2552 2553 return 0; 2554 } 2555 2556 /** 2557 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2558 * 2559 */ 2560 void cleanup_socket_xprt(void) 2561 { 2562 #ifdef RPC_DEBUG 2563 if (sunrpc_table_header) { 2564 unregister_sysctl_table(sunrpc_table_header); 2565 sunrpc_table_header = NULL; 2566 } 2567 #endif 2568 2569 xprt_unregister_transport(&xs_udp_transport); 2570 xprt_unregister_transport(&xs_tcp_transport); 2571 xprt_unregister_transport(&xs_bc_tcp_transport); 2572 } 2573 2574 static int param_set_uint_minmax(const char *val, struct kernel_param *kp, 2575 unsigned int min, unsigned int max) 2576 { 2577 unsigned long num; 2578 int ret; 2579 2580 if (!val) 2581 return -EINVAL; 2582 ret = strict_strtoul(val, 0, &num); 2583 if (ret == -EINVAL || num < min || num > max) 2584 return -EINVAL; 2585 *((unsigned int *)kp->arg) = num; 2586 return 0; 2587 } 2588 2589 static int param_set_portnr(const char *val, struct kernel_param *kp) 2590 { 2591 return param_set_uint_minmax(val, kp, 2592 RPC_MIN_RESVPORT, 2593 RPC_MAX_RESVPORT); 2594 } 2595 2596 static int param_get_portnr(char *buffer, struct kernel_param *kp) 2597 { 2598 return param_get_uint(buffer, kp); 2599 } 2600 #define param_check_portnr(name, p) \ 2601 __param_check(name, p, unsigned int); 2602 2603 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 2604 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 2605 2606 static int param_set_slot_table_size(const char *val, struct kernel_param *kp) 2607 { 2608 return param_set_uint_minmax(val, kp, 2609 RPC_MIN_SLOT_TABLE, 2610 RPC_MAX_SLOT_TABLE); 2611 } 2612 2613 static int param_get_slot_table_size(char *buffer, struct kernel_param *kp) 2614 { 2615 return param_get_uint(buffer, kp); 2616 } 2617 #define param_check_slot_table_size(name, p) \ 2618 __param_check(name, p, unsigned int); 2619 2620 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 2621 slot_table_size, 0644); 2622 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 2623 slot_table_size, 0644); 2624 2625