1/* 2 * linux/net/sunrpc/xprtsock.c 3 * 4 * Client-side transport implementation for sockets. 5 * 6 * TCP callback races fixes (C) 1998 Red Hat 7 * TCP send fixes (C) 1998 Red Hat 8 * TCP NFS related read + write fixes 9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 10 * 11 * Rewrite of larges part of the code in order to stabilize TCP stuff. 12 * Fix behaviour when socket buffer is full. 13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 14 * 15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 16 * 17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 18 * <gilles.quillard@bull.net> 19 */ 20 21#include <linux/types.h> 22#include <linux/string.h> 23#include <linux/slab.h> 24#include <linux/module.h> 25#include <linux/capability.h> 26#include <linux/pagemap.h> 27#include <linux/errno.h> 28#include <linux/socket.h> 29#include <linux/in.h> 30#include <linux/net.h> 31#include <linux/mm.h> 32#include <linux/un.h> 33#include <linux/udp.h> 34#include <linux/tcp.h> 35#include <linux/sunrpc/clnt.h> 36#include <linux/sunrpc/addr.h> 37#include <linux/sunrpc/sched.h> 38#include <linux/sunrpc/svcsock.h> 39#include <linux/sunrpc/xprtsock.h> 40#include <linux/file.h> 41#ifdef CONFIG_SUNRPC_BACKCHANNEL 42#include <linux/sunrpc/bc_xprt.h> 43#endif 44 45#include <net/sock.h> 46#include <net/checksum.h> 47#include <net/udp.h> 48#include <net/tcp.h> 49 50#include <trace/events/sunrpc.h> 51 52#include "sunrpc.h" 53 54static void xs_close(struct rpc_xprt *xprt); 55 56/* 57 * xprtsock tunables 58 */ 59static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 60static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 61static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 62 63static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 64static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 65 66#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 67 68#define XS_TCP_LINGER_TO (15U * HZ) 69static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 70 71/* 72 * We can register our own files under /proc/sys/sunrpc by 73 * calling register_sysctl_table() again. The files in that 74 * directory become the union of all files registered there. 75 * 76 * We simply need to make sure that we don't collide with 77 * someone else's file names! 78 */ 79 80static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 81static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 82static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 83static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 84static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 85 86static struct ctl_table_header *sunrpc_table_header; 87 88/* 89 * FIXME: changing the UDP slot table size should also resize the UDP 90 * socket buffers for existing UDP transports 91 */ 92static struct ctl_table xs_tunables_table[] = { 93 { 94 .procname = "udp_slot_table_entries", 95 .data = &xprt_udp_slot_table_entries, 96 .maxlen = sizeof(unsigned int), 97 .mode = 0644, 98 .proc_handler = proc_dointvec_minmax, 99 .extra1 = &min_slot_table_size, 100 .extra2 = &max_slot_table_size 101 }, 102 { 103 .procname = "tcp_slot_table_entries", 104 .data = &xprt_tcp_slot_table_entries, 105 .maxlen = sizeof(unsigned int), 106 .mode = 0644, 107 .proc_handler = proc_dointvec_minmax, 108 .extra1 = &min_slot_table_size, 109 .extra2 = &max_slot_table_size 110 }, 111 { 112 .procname = "tcp_max_slot_table_entries", 113 .data = &xprt_max_tcp_slot_table_entries, 114 .maxlen = sizeof(unsigned int), 115 .mode = 0644, 116 .proc_handler = proc_dointvec_minmax, 117 .extra1 = &min_slot_table_size, 118 .extra2 = &max_tcp_slot_table_limit 119 }, 120 { 121 .procname = "min_resvport", 122 .data = &xprt_min_resvport, 123 .maxlen = sizeof(unsigned int), 124 .mode = 0644, 125 .proc_handler = proc_dointvec_minmax, 126 .extra1 = &xprt_min_resvport_limit, 127 .extra2 = &xprt_max_resvport_limit 128 }, 129 { 130 .procname = "max_resvport", 131 .data = &xprt_max_resvport, 132 .maxlen = sizeof(unsigned int), 133 .mode = 0644, 134 .proc_handler = proc_dointvec_minmax, 135 .extra1 = &xprt_min_resvport_limit, 136 .extra2 = &xprt_max_resvport_limit 137 }, 138 { 139 .procname = "tcp_fin_timeout", 140 .data = &xs_tcp_fin_timeout, 141 .maxlen = sizeof(xs_tcp_fin_timeout), 142 .mode = 0644, 143 .proc_handler = proc_dointvec_jiffies, 144 }, 145 { }, 146}; 147 148static struct ctl_table sunrpc_table[] = { 149 { 150 .procname = "sunrpc", 151 .mode = 0555, 152 .child = xs_tunables_table 153 }, 154 { }, 155}; 156 157#endif 158 159/* 160 * Wait duration for a reply from the RPC portmapper. 161 */ 162#define XS_BIND_TO (60U * HZ) 163 164/* 165 * Delay if a UDP socket connect error occurs. This is most likely some 166 * kind of resource problem on the local host. 167 */ 168#define XS_UDP_REEST_TO (2U * HZ) 169 170/* 171 * The reestablish timeout allows clients to delay for a bit before attempting 172 * to reconnect to a server that just dropped our connection. 173 * 174 * We implement an exponential backoff when trying to reestablish a TCP 175 * transport connection with the server. Some servers like to drop a TCP 176 * connection when they are overworked, so we start with a short timeout and 177 * increase over time if the server is down or not responding. 178 */ 179#define XS_TCP_INIT_REEST_TO (3U * HZ) 180#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 181 182/* 183 * TCP idle timeout; client drops the transport socket if it is idle 184 * for this long. Note that we also timeout UDP sockets to prevent 185 * holding port numbers when there is no RPC traffic. 186 */ 187#define XS_IDLE_DISC_TO (5U * 60 * HZ) 188 189#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 190# undef RPC_DEBUG_DATA 191# define RPCDBG_FACILITY RPCDBG_TRANS 192#endif 193 194#ifdef RPC_DEBUG_DATA 195static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 196{ 197 u8 *buf = (u8 *) packet; 198 int j; 199 200 dprintk("RPC: %s\n", msg); 201 for (j = 0; j < count && j < 128; j += 4) { 202 if (!(j & 31)) { 203 if (j) 204 dprintk("\n"); 205 dprintk("0x%04x ", j); 206 } 207 dprintk("%02x%02x%02x%02x ", 208 buf[j], buf[j+1], buf[j+2], buf[j+3]); 209 } 210 dprintk("\n"); 211} 212#else 213static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 214{ 215 /* NOP */ 216} 217#endif 218 219static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 220{ 221 return (struct rpc_xprt *) sk->sk_user_data; 222} 223 224static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 225{ 226 return (struct sockaddr *) &xprt->addr; 227} 228 229static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 230{ 231 return (struct sockaddr_un *) &xprt->addr; 232} 233 234static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 235{ 236 return (struct sockaddr_in *) &xprt->addr; 237} 238 239static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 240{ 241 return (struct sockaddr_in6 *) &xprt->addr; 242} 243 244static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 245{ 246 struct sockaddr *sap = xs_addr(xprt); 247 struct sockaddr_in6 *sin6; 248 struct sockaddr_in *sin; 249 struct sockaddr_un *sun; 250 char buf[128]; 251 252 switch (sap->sa_family) { 253 case AF_LOCAL: 254 sun = xs_addr_un(xprt); 255 strlcpy(buf, sun->sun_path, sizeof(buf)); 256 xprt->address_strings[RPC_DISPLAY_ADDR] = 257 kstrdup(buf, GFP_KERNEL); 258 break; 259 case AF_INET: 260 (void)rpc_ntop(sap, buf, sizeof(buf)); 261 xprt->address_strings[RPC_DISPLAY_ADDR] = 262 kstrdup(buf, GFP_KERNEL); 263 sin = xs_addr_in(xprt); 264 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 265 break; 266 case AF_INET6: 267 (void)rpc_ntop(sap, buf, sizeof(buf)); 268 xprt->address_strings[RPC_DISPLAY_ADDR] = 269 kstrdup(buf, GFP_KERNEL); 270 sin6 = xs_addr_in6(xprt); 271 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 272 break; 273 default: 274 BUG(); 275 } 276 277 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 278} 279 280static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 281{ 282 struct sockaddr *sap = xs_addr(xprt); 283 char buf[128]; 284 285 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 286 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 287 288 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 289 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 290} 291 292static void xs_format_peer_addresses(struct rpc_xprt *xprt, 293 const char *protocol, 294 const char *netid) 295{ 296 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 297 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 298 xs_format_common_peer_addresses(xprt); 299 xs_format_common_peer_ports(xprt); 300} 301 302static void xs_update_peer_port(struct rpc_xprt *xprt) 303{ 304 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 305 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 306 307 xs_format_common_peer_ports(xprt); 308} 309 310static void xs_free_peer_addresses(struct rpc_xprt *xprt) 311{ 312 unsigned int i; 313 314 for (i = 0; i < RPC_DISPLAY_MAX; i++) 315 switch (i) { 316 case RPC_DISPLAY_PROTO: 317 case RPC_DISPLAY_NETID: 318 continue; 319 default: 320 kfree(xprt->address_strings[i]); 321 } 322} 323 324#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 325 326static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) 327{ 328 struct msghdr msg = { 329 .msg_name = addr, 330 .msg_namelen = addrlen, 331 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), 332 }; 333 struct kvec iov = { 334 .iov_base = vec->iov_base + base, 335 .iov_len = vec->iov_len - base, 336 }; 337 338 if (iov.iov_len != 0) 339 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 340 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 341} 342 343static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p) 344{ 345 ssize_t (*do_sendpage)(struct socket *sock, struct page *page, 346 int offset, size_t size, int flags); 347 struct page **ppage; 348 unsigned int remainder; 349 int err; 350 351 remainder = xdr->page_len - base; 352 base += xdr->page_base; 353 ppage = xdr->pages + (base >> PAGE_SHIFT); 354 base &= ~PAGE_MASK; 355 do_sendpage = sock->ops->sendpage; 356 if (!zerocopy) 357 do_sendpage = sock_no_sendpage; 358 for(;;) { 359 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); 360 int flags = XS_SENDMSG_FLAGS; 361 362 remainder -= len; 363 if (remainder != 0 || more) 364 flags |= MSG_MORE; 365 err = do_sendpage(sock, *ppage, base, len, flags); 366 if (remainder == 0 || err != len) 367 break; 368 *sent_p += err; 369 ppage++; 370 base = 0; 371 } 372 if (err > 0) { 373 *sent_p += err; 374 err = 0; 375 } 376 return err; 377} 378 379/** 380 * xs_sendpages - write pages directly to a socket 381 * @sock: socket to send on 382 * @addr: UDP only -- address of destination 383 * @addrlen: UDP only -- length of destination address 384 * @xdr: buffer containing this request 385 * @base: starting position in the buffer 386 * @zerocopy: true if it is safe to use sendpage() 387 * @sent_p: return the total number of bytes successfully queued for sending 388 * 389 */ 390static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p) 391{ 392 unsigned int remainder = xdr->len - base; 393 int err = 0; 394 int sent = 0; 395 396 if (unlikely(!sock)) 397 return -ENOTSOCK; 398 399 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 400 if (base != 0) { 401 addr = NULL; 402 addrlen = 0; 403 } 404 405 if (base < xdr->head[0].iov_len || addr != NULL) { 406 unsigned int len = xdr->head[0].iov_len - base; 407 remainder -= len; 408 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); 409 if (remainder == 0 || err != len) 410 goto out; 411 *sent_p += err; 412 base = 0; 413 } else 414 base -= xdr->head[0].iov_len; 415 416 if (base < xdr->page_len) { 417 unsigned int len = xdr->page_len - base; 418 remainder -= len; 419 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent); 420 *sent_p += sent; 421 if (remainder == 0 || sent != len) 422 goto out; 423 base = 0; 424 } else 425 base -= xdr->page_len; 426 427 if (base >= xdr->tail[0].iov_len) 428 return 0; 429 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); 430out: 431 if (err > 0) { 432 *sent_p += err; 433 err = 0; 434 } 435 return err; 436} 437 438static void xs_nospace_callback(struct rpc_task *task) 439{ 440 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); 441 442 transport->inet->sk_write_pending--; 443 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 444} 445 446/** 447 * xs_nospace - place task on wait queue if transmit was incomplete 448 * @task: task to put to sleep 449 * 450 */ 451static int xs_nospace(struct rpc_task *task) 452{ 453 struct rpc_rqst *req = task->tk_rqstp; 454 struct rpc_xprt *xprt = req->rq_xprt; 455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 456 struct sock *sk = transport->inet; 457 int ret = -EAGAIN; 458 459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 460 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 461 req->rq_slen); 462 463 /* Protect against races with write_space */ 464 spin_lock_bh(&xprt->transport_lock); 465 466 /* Don't race with disconnect */ 467 if (xprt_connected(xprt)) { 468 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { 469 /* 470 * Notify TCP that we're limited by the application 471 * window size 472 */ 473 set_bit(SOCK_NOSPACE, &transport->sock->flags); 474 sk->sk_write_pending++; 475 /* ...and wait for more buffer space */ 476 xprt_wait_for_buffer_space(task, xs_nospace_callback); 477 } 478 } else { 479 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 480 ret = -ENOTCONN; 481 } 482 483 spin_unlock_bh(&xprt->transport_lock); 484 485 /* Race breaker in case memory is freed before above code is called */ 486 sk->sk_write_space(sk); 487 return ret; 488} 489 490/* 491 * Construct a stream transport record marker in @buf. 492 */ 493static inline void xs_encode_stream_record_marker(struct xdr_buf *buf) 494{ 495 u32 reclen = buf->len - sizeof(rpc_fraghdr); 496 rpc_fraghdr *base = buf->head[0].iov_base; 497 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen); 498} 499 500/** 501 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 502 * @task: RPC task that manages the state of an RPC request 503 * 504 * Return values: 505 * 0: The request has been sent 506 * EAGAIN: The socket was blocked, please call again later to 507 * complete the request 508 * ENOTCONN: Caller needs to invoke connect logic then call again 509 * other: Some other error occured, the request was not sent 510 */ 511static int xs_local_send_request(struct rpc_task *task) 512{ 513 struct rpc_rqst *req = task->tk_rqstp; 514 struct rpc_xprt *xprt = req->rq_xprt; 515 struct sock_xprt *transport = 516 container_of(xprt, struct sock_xprt, xprt); 517 struct xdr_buf *xdr = &req->rq_snd_buf; 518 int status; 519 int sent = 0; 520 521 xs_encode_stream_record_marker(&req->rq_snd_buf); 522 523 xs_pktdump("packet data:", 524 req->rq_svec->iov_base, req->rq_svec->iov_len); 525 526 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent, 527 true, &sent); 528 dprintk("RPC: %s(%u) = %d\n", 529 __func__, xdr->len - req->rq_bytes_sent, status); 530 if (likely(sent > 0) || status == 0) { 531 req->rq_bytes_sent += sent; 532 req->rq_xmit_bytes_sent += sent; 533 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 534 req->rq_bytes_sent = 0; 535 return 0; 536 } 537 status = -EAGAIN; 538 } 539 540 switch (status) { 541 case -ENOBUFS: 542 case -EAGAIN: 543 status = xs_nospace(task); 544 break; 545 default: 546 dprintk("RPC: sendmsg returned unrecognized error %d\n", 547 -status); 548 case -EPIPE: 549 xs_close(xprt); 550 status = -ENOTCONN; 551 } 552 553 return status; 554} 555 556/** 557 * xs_udp_send_request - write an RPC request to a UDP socket 558 * @task: address of RPC task that manages the state of an RPC request 559 * 560 * Return values: 561 * 0: The request has been sent 562 * EAGAIN: The socket was blocked, please call again later to 563 * complete the request 564 * ENOTCONN: Caller needs to invoke connect logic then call again 565 * other: Some other error occurred, the request was not sent 566 */ 567static int xs_udp_send_request(struct rpc_task *task) 568{ 569 struct rpc_rqst *req = task->tk_rqstp; 570 struct rpc_xprt *xprt = req->rq_xprt; 571 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 572 struct xdr_buf *xdr = &req->rq_snd_buf; 573 int sent = 0; 574 int status; 575 576 xs_pktdump("packet data:", 577 req->rq_svec->iov_base, 578 req->rq_svec->iov_len); 579 580 if (!xprt_bound(xprt)) 581 return -ENOTCONN; 582 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 583 xdr, req->rq_bytes_sent, true, &sent); 584 585 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 586 xdr->len - req->rq_bytes_sent, status); 587 588 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 589 if (status == -EPERM) 590 goto process_status; 591 592 if (sent > 0 || status == 0) { 593 req->rq_xmit_bytes_sent += sent; 594 if (sent >= req->rq_slen) 595 return 0; 596 /* Still some bytes left; set up for a retry later. */ 597 status = -EAGAIN; 598 } 599 600process_status: 601 switch (status) { 602 case -ENOTSOCK: 603 status = -ENOTCONN; 604 /* Should we call xs_close() here? */ 605 break; 606 case -EAGAIN: 607 status = xs_nospace(task); 608 break; 609 default: 610 dprintk("RPC: sendmsg returned unrecognized error %d\n", 611 -status); 612 case -ENETUNREACH: 613 case -ENOBUFS: 614 case -EPIPE: 615 case -ECONNREFUSED: 616 case -EPERM: 617 /* When the server has died, an ICMP port unreachable message 618 * prompts ECONNREFUSED. */ 619 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 620 } 621 622 return status; 623} 624 625/** 626 * xs_tcp_shutdown - gracefully shut down a TCP socket 627 * @xprt: transport 628 * 629 * Initiates a graceful shutdown of the TCP socket by calling the 630 * equivalent of shutdown(SHUT_RDWR); 631 */ 632static void xs_tcp_shutdown(struct rpc_xprt *xprt) 633{ 634 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 635 struct socket *sock = transport->sock; 636 637 if (sock != NULL) { 638 kernel_sock_shutdown(sock, SHUT_RDWR); 639 trace_rpc_socket_shutdown(xprt, sock); 640 } 641} 642 643/** 644 * xs_tcp_send_request - write an RPC request to a TCP socket 645 * @task: address of RPC task that manages the state of an RPC request 646 * 647 * Return values: 648 * 0: The request has been sent 649 * EAGAIN: The socket was blocked, please call again later to 650 * complete the request 651 * ENOTCONN: Caller needs to invoke connect logic then call again 652 * other: Some other error occurred, the request was not sent 653 * 654 * XXX: In the case of soft timeouts, should we eventually give up 655 * if sendmsg is not able to make progress? 656 */ 657static int xs_tcp_send_request(struct rpc_task *task) 658{ 659 struct rpc_rqst *req = task->tk_rqstp; 660 struct rpc_xprt *xprt = req->rq_xprt; 661 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 662 struct xdr_buf *xdr = &req->rq_snd_buf; 663 bool zerocopy = true; 664 int status; 665 int sent; 666 667 xs_encode_stream_record_marker(&req->rq_snd_buf); 668 669 xs_pktdump("packet data:", 670 req->rq_svec->iov_base, 671 req->rq_svec->iov_len); 672 /* Don't use zero copy if this is a resend. If the RPC call 673 * completes while the socket holds a reference to the pages, 674 * then we may end up resending corrupted data. 675 */ 676 if (task->tk_flags & RPC_TASK_SENT) 677 zerocopy = false; 678 679 /* Continue transmitting the packet/record. We must be careful 680 * to cope with writespace callbacks arriving _after_ we have 681 * called sendmsg(). */ 682 while (1) { 683 sent = 0; 684 status = xs_sendpages(transport->sock, NULL, 0, xdr, 685 req->rq_bytes_sent, zerocopy, &sent); 686 687 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 688 xdr->len - req->rq_bytes_sent, status); 689 690 if (unlikely(sent == 0 && status < 0)) 691 break; 692 693 /* If we've sent the entire packet, immediately 694 * reset the count of bytes sent. */ 695 req->rq_bytes_sent += sent; 696 req->rq_xmit_bytes_sent += sent; 697 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 698 req->rq_bytes_sent = 0; 699 return 0; 700 } 701 702 if (sent != 0) 703 continue; 704 status = -EAGAIN; 705 break; 706 } 707 708 switch (status) { 709 case -ENOTSOCK: 710 status = -ENOTCONN; 711 /* Should we call xs_close() here? */ 712 break; 713 case -ENOBUFS: 714 case -EAGAIN: 715 status = xs_nospace(task); 716 break; 717 default: 718 dprintk("RPC: sendmsg returned unrecognized error %d\n", 719 -status); 720 case -ECONNRESET: 721 case -ECONNREFUSED: 722 case -ENOTCONN: 723 case -EADDRINUSE: 724 case -EPIPE: 725 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); 726 } 727 728 return status; 729} 730 731/** 732 * xs_tcp_release_xprt - clean up after a tcp transmission 733 * @xprt: transport 734 * @task: rpc task 735 * 736 * This cleans up if an error causes us to abort the transmission of a request. 737 * In this case, the socket may need to be reset in order to avoid confusing 738 * the server. 739 */ 740static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) 741{ 742 struct rpc_rqst *req; 743 744 if (task != xprt->snd_task) 745 return; 746 if (task == NULL) 747 goto out_release; 748 req = task->tk_rqstp; 749 if (req == NULL) 750 goto out_release; 751 if (req->rq_bytes_sent == 0) 752 goto out_release; 753 if (req->rq_bytes_sent == req->rq_snd_buf.len) 754 goto out_release; 755 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 756out_release: 757 xprt_release_xprt(xprt, task); 758} 759 760static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 761{ 762 transport->old_data_ready = sk->sk_data_ready; 763 transport->old_state_change = sk->sk_state_change; 764 transport->old_write_space = sk->sk_write_space; 765 transport->old_error_report = sk->sk_error_report; 766} 767 768static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 769{ 770 sk->sk_data_ready = transport->old_data_ready; 771 sk->sk_state_change = transport->old_state_change; 772 sk->sk_write_space = transport->old_write_space; 773 sk->sk_error_report = transport->old_error_report; 774} 775 776static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 777{ 778 smp_mb__before_atomic(); 779 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 780 clear_bit(XPRT_CLOSING, &xprt->state); 781 smp_mb__after_atomic(); 782} 783 784static void xs_sock_mark_closed(struct rpc_xprt *xprt) 785{ 786 xs_sock_reset_connection_flags(xprt); 787 /* Mark transport as closed and wake up all pending tasks */ 788 xprt_disconnect_done(xprt); 789} 790 791/** 792 * xs_error_report - callback to handle TCP socket state errors 793 * @sk: socket 794 * 795 * Note: we don't call sock_error() since there may be a rpc_task 796 * using the socket, and so we don't want to clear sk->sk_err. 797 */ 798static void xs_error_report(struct sock *sk) 799{ 800 struct rpc_xprt *xprt; 801 int err; 802 803 read_lock_bh(&sk->sk_callback_lock); 804 if (!(xprt = xprt_from_sock(sk))) 805 goto out; 806 807 err = -sk->sk_err; 808 if (err == 0) 809 goto out; 810 /* Is this a reset event? */ 811 if (sk->sk_state == TCP_CLOSE) 812 xs_sock_mark_closed(xprt); 813 dprintk("RPC: xs_error_report client %p, error=%d...\n", 814 xprt, -err); 815 trace_rpc_socket_error(xprt, sk->sk_socket, err); 816 xprt_wake_pending_tasks(xprt, err); 817 out: 818 read_unlock_bh(&sk->sk_callback_lock); 819} 820 821static void xs_reset_transport(struct sock_xprt *transport) 822{ 823 struct socket *sock = transport->sock; 824 struct sock *sk = transport->inet; 825 struct rpc_xprt *xprt = &transport->xprt; 826 827 if (sk == NULL) 828 return; 829 830 write_lock_bh(&sk->sk_callback_lock); 831 transport->inet = NULL; 832 transport->sock = NULL; 833 834 sk->sk_user_data = NULL; 835 836 xs_restore_old_callbacks(transport, sk); 837 xprt_clear_connected(xprt); 838 write_unlock_bh(&sk->sk_callback_lock); 839 xs_sock_reset_connection_flags(xprt); 840 841 trace_rpc_socket_close(xprt, sock); 842 sock_release(sock); 843} 844 845/** 846 * xs_close - close a socket 847 * @xprt: transport 848 * 849 * This is used when all requests are complete; ie, no DRC state remains 850 * on the server we want to save. 851 * 852 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 853 * xs_reset_transport() zeroing the socket from underneath a writer. 854 */ 855static void xs_close(struct rpc_xprt *xprt) 856{ 857 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 858 859 dprintk("RPC: xs_close xprt %p\n", xprt); 860 861 xs_reset_transport(transport); 862 xprt->reestablish_timeout = 0; 863 864 xprt_disconnect_done(xprt); 865} 866 867static void xs_xprt_free(struct rpc_xprt *xprt) 868{ 869 xs_free_peer_addresses(xprt); 870 xprt_free(xprt); 871} 872 873/** 874 * xs_destroy - prepare to shutdown a transport 875 * @xprt: doomed transport 876 * 877 */ 878static void xs_destroy(struct rpc_xprt *xprt) 879{ 880 dprintk("RPC: xs_destroy xprt %p\n", xprt); 881 882 xs_close(xprt); 883 xs_xprt_free(xprt); 884 module_put(THIS_MODULE); 885} 886 887static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb) 888{ 889 struct xdr_skb_reader desc = { 890 .skb = skb, 891 .offset = sizeof(rpc_fraghdr), 892 .count = skb->len - sizeof(rpc_fraghdr), 893 }; 894 895 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0) 896 return -1; 897 if (desc.count) 898 return -1; 899 return 0; 900} 901 902/** 903 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets 904 * @sk: socket with data to read 905 * @len: how much data to read 906 * 907 * Currently this assumes we can read the whole reply in a single gulp. 908 */ 909static void xs_local_data_ready(struct sock *sk) 910{ 911 struct rpc_task *task; 912 struct rpc_xprt *xprt; 913 struct rpc_rqst *rovr; 914 struct sk_buff *skb; 915 int err, repsize, copied; 916 u32 _xid; 917 __be32 *xp; 918 919 read_lock_bh(&sk->sk_callback_lock); 920 dprintk("RPC: %s...\n", __func__); 921 xprt = xprt_from_sock(sk); 922 if (xprt == NULL) 923 goto out; 924 925 skb = skb_recv_datagram(sk, 0, 1, &err); 926 if (skb == NULL) 927 goto out; 928 929 repsize = skb->len - sizeof(rpc_fraghdr); 930 if (repsize < 4) { 931 dprintk("RPC: impossible RPC reply size %d\n", repsize); 932 goto dropit; 933 } 934 935 /* Copy the XID from the skb... */ 936 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid); 937 if (xp == NULL) 938 goto dropit; 939 940 /* Look up and lock the request corresponding to the given XID */ 941 spin_lock(&xprt->transport_lock); 942 rovr = xprt_lookup_rqst(xprt, *xp); 943 if (!rovr) 944 goto out_unlock; 945 task = rovr->rq_task; 946 947 copied = rovr->rq_private_buf.buflen; 948 if (copied > repsize) 949 copied = repsize; 950 951 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) { 952 dprintk("RPC: sk_buff copy failed\n"); 953 goto out_unlock; 954 } 955 956 xprt_complete_rqst(task, copied); 957 958 out_unlock: 959 spin_unlock(&xprt->transport_lock); 960 dropit: 961 skb_free_datagram(sk, skb); 962 out: 963 read_unlock_bh(&sk->sk_callback_lock); 964} 965 966/** 967 * xs_udp_data_ready - "data ready" callback for UDP sockets 968 * @sk: socket with data to read 969 * @len: how much data to read 970 * 971 */ 972static void xs_udp_data_ready(struct sock *sk) 973{ 974 struct rpc_task *task; 975 struct rpc_xprt *xprt; 976 struct rpc_rqst *rovr; 977 struct sk_buff *skb; 978 int err, repsize, copied; 979 u32 _xid; 980 __be32 *xp; 981 982 read_lock_bh(&sk->sk_callback_lock); 983 dprintk("RPC: xs_udp_data_ready...\n"); 984 if (!(xprt = xprt_from_sock(sk))) 985 goto out; 986 987 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 988 goto out; 989 990 repsize = skb->len - sizeof(struct udphdr); 991 if (repsize < 4) { 992 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 993 goto dropit; 994 } 995 996 /* Copy the XID from the skb... */ 997 xp = skb_header_pointer(skb, sizeof(struct udphdr), 998 sizeof(_xid), &_xid); 999 if (xp == NULL) 1000 goto dropit; 1001 1002 /* Look up and lock the request corresponding to the given XID */ 1003 spin_lock(&xprt->transport_lock); 1004 rovr = xprt_lookup_rqst(xprt, *xp); 1005 if (!rovr) 1006 goto out_unlock; 1007 task = rovr->rq_task; 1008 1009 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1010 copied = repsize; 1011 1012 /* Suck it into the iovec, verify checksum if not done by hw. */ 1013 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1014 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS); 1015 goto out_unlock; 1016 } 1017 1018 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS); 1019 1020 xprt_adjust_cwnd(xprt, task, copied); 1021 xprt_complete_rqst(task, copied); 1022 1023 out_unlock: 1024 spin_unlock(&xprt->transport_lock); 1025 dropit: 1026 skb_free_datagram(sk, skb); 1027 out: 1028 read_unlock_bh(&sk->sk_callback_lock); 1029} 1030 1031/* 1032 * Helper function to force a TCP close if the server is sending 1033 * junk and/or it has put us in CLOSE_WAIT 1034 */ 1035static void xs_tcp_force_close(struct rpc_xprt *xprt) 1036{ 1037 xprt_force_disconnect(xprt); 1038} 1039 1040static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) 1041{ 1042 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1043 size_t len, used; 1044 char *p; 1045 1046 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; 1047 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; 1048 used = xdr_skb_read_bits(desc, p, len); 1049 transport->tcp_offset += used; 1050 if (used != len) 1051 return; 1052 1053 transport->tcp_reclen = ntohl(transport->tcp_fraghdr); 1054 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 1055 transport->tcp_flags |= TCP_RCV_LAST_FRAG; 1056 else 1057 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; 1058 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 1059 1060 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; 1061 transport->tcp_offset = 0; 1062 1063 /* Sanity check of the record length */ 1064 if (unlikely(transport->tcp_reclen < 8)) { 1065 dprintk("RPC: invalid TCP record fragment length\n"); 1066 xs_tcp_force_close(xprt); 1067 return; 1068 } 1069 dprintk("RPC: reading TCP record fragment of length %d\n", 1070 transport->tcp_reclen); 1071} 1072 1073static void xs_tcp_check_fraghdr(struct sock_xprt *transport) 1074{ 1075 if (transport->tcp_offset == transport->tcp_reclen) { 1076 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; 1077 transport->tcp_offset = 0; 1078 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { 1079 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1080 transport->tcp_flags |= TCP_RCV_COPY_XID; 1081 transport->tcp_copied = 0; 1082 } 1083 } 1084} 1085 1086static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1087{ 1088 size_t len, used; 1089 char *p; 1090 1091 len = sizeof(transport->tcp_xid) - transport->tcp_offset; 1092 dprintk("RPC: reading XID (%Zu bytes)\n", len); 1093 p = ((char *) &transport->tcp_xid) + transport->tcp_offset; 1094 used = xdr_skb_read_bits(desc, p, len); 1095 transport->tcp_offset += used; 1096 if (used != len) 1097 return; 1098 transport->tcp_flags &= ~TCP_RCV_COPY_XID; 1099 transport->tcp_flags |= TCP_RCV_READ_CALLDIR; 1100 transport->tcp_copied = 4; 1101 dprintk("RPC: reading %s XID %08x\n", 1102 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for" 1103 : "request with", 1104 ntohl(transport->tcp_xid)); 1105 xs_tcp_check_fraghdr(transport); 1106} 1107 1108static inline void xs_tcp_read_calldir(struct sock_xprt *transport, 1109 struct xdr_skb_reader *desc) 1110{ 1111 size_t len, used; 1112 u32 offset; 1113 char *p; 1114 1115 /* 1116 * We want transport->tcp_offset to be 8 at the end of this routine 1117 * (4 bytes for the xid and 4 bytes for the call/reply flag). 1118 * When this function is called for the first time, 1119 * transport->tcp_offset is 4 (after having already read the xid). 1120 */ 1121 offset = transport->tcp_offset - sizeof(transport->tcp_xid); 1122 len = sizeof(transport->tcp_calldir) - offset; 1123 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len); 1124 p = ((char *) &transport->tcp_calldir) + offset; 1125 used = xdr_skb_read_bits(desc, p, len); 1126 transport->tcp_offset += used; 1127 if (used != len) 1128 return; 1129 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR; 1130 /* 1131 * We don't yet have the XDR buffer, so we will write the calldir 1132 * out after we get the buffer from the 'struct rpc_rqst' 1133 */ 1134 switch (ntohl(transport->tcp_calldir)) { 1135 case RPC_REPLY: 1136 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1137 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1138 transport->tcp_flags |= TCP_RPC_REPLY; 1139 break; 1140 case RPC_CALL: 1141 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR; 1142 transport->tcp_flags |= TCP_RCV_COPY_DATA; 1143 transport->tcp_flags &= ~TCP_RPC_REPLY; 1144 break; 1145 default: 1146 dprintk("RPC: invalid request message type\n"); 1147 xs_tcp_force_close(&transport->xprt); 1148 } 1149 xs_tcp_check_fraghdr(transport); 1150} 1151 1152static inline void xs_tcp_read_common(struct rpc_xprt *xprt, 1153 struct xdr_skb_reader *desc, 1154 struct rpc_rqst *req) 1155{ 1156 struct sock_xprt *transport = 1157 container_of(xprt, struct sock_xprt, xprt); 1158 struct xdr_buf *rcvbuf; 1159 size_t len; 1160 ssize_t r; 1161 1162 rcvbuf = &req->rq_private_buf; 1163 1164 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) { 1165 /* 1166 * Save the RPC direction in the XDR buffer 1167 */ 1168 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied, 1169 &transport->tcp_calldir, 1170 sizeof(transport->tcp_calldir)); 1171 transport->tcp_copied += sizeof(transport->tcp_calldir); 1172 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR; 1173 } 1174 1175 len = desc->count; 1176 if (len > transport->tcp_reclen - transport->tcp_offset) { 1177 struct xdr_skb_reader my_desc; 1178 1179 len = transport->tcp_reclen - transport->tcp_offset; 1180 memcpy(&my_desc, desc, sizeof(my_desc)); 1181 my_desc.count = len; 1182 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1183 &my_desc, xdr_skb_read_bits); 1184 desc->count -= r; 1185 desc->offset += r; 1186 } else 1187 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, 1188 desc, xdr_skb_read_bits); 1189 1190 if (r > 0) { 1191 transport->tcp_copied += r; 1192 transport->tcp_offset += r; 1193 } 1194 if (r != len) { 1195 /* Error when copying to the receive buffer, 1196 * usually because we weren't able to allocate 1197 * additional buffer pages. All we can do now 1198 * is turn off TCP_RCV_COPY_DATA, so the request 1199 * will not receive any additional updates, 1200 * and time out. 1201 * Any remaining data from this record will 1202 * be discarded. 1203 */ 1204 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1205 dprintk("RPC: XID %08x truncated request\n", 1206 ntohl(transport->tcp_xid)); 1207 dprintk("RPC: xprt = %p, tcp_copied = %lu, " 1208 "tcp_offset = %u, tcp_reclen = %u\n", 1209 xprt, transport->tcp_copied, 1210 transport->tcp_offset, transport->tcp_reclen); 1211 return; 1212 } 1213 1214 dprintk("RPC: XID %08x read %Zd bytes\n", 1215 ntohl(transport->tcp_xid), r); 1216 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " 1217 "tcp_reclen = %u\n", xprt, transport->tcp_copied, 1218 transport->tcp_offset, transport->tcp_reclen); 1219 1220 if (transport->tcp_copied == req->rq_private_buf.buflen) 1221 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1222 else if (transport->tcp_offset == transport->tcp_reclen) { 1223 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) 1224 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1225 } 1226} 1227 1228/* 1229 * Finds the request corresponding to the RPC xid and invokes the common 1230 * tcp read code to read the data. 1231 */ 1232static inline int xs_tcp_read_reply(struct rpc_xprt *xprt, 1233 struct xdr_skb_reader *desc) 1234{ 1235 struct sock_xprt *transport = 1236 container_of(xprt, struct sock_xprt, xprt); 1237 struct rpc_rqst *req; 1238 1239 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid)); 1240 1241 /* Find and lock the request corresponding to this xid */ 1242 spin_lock(&xprt->transport_lock); 1243 req = xprt_lookup_rqst(xprt, transport->tcp_xid); 1244 if (!req) { 1245 dprintk("RPC: XID %08x request not found!\n", 1246 ntohl(transport->tcp_xid)); 1247 spin_unlock(&xprt->transport_lock); 1248 return -1; 1249 } 1250 1251 xs_tcp_read_common(xprt, desc, req); 1252 1253 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1254 xprt_complete_rqst(req->rq_task, transport->tcp_copied); 1255 1256 spin_unlock(&xprt->transport_lock); 1257 return 0; 1258} 1259 1260#if defined(CONFIG_SUNRPC_BACKCHANNEL) 1261/* 1262 * Obtains an rpc_rqst previously allocated and invokes the common 1263 * tcp read code to read the data. The result is placed in the callback 1264 * queue. 1265 * If we're unable to obtain the rpc_rqst we schedule the closing of the 1266 * connection and return -1. 1267 */ 1268static int xs_tcp_read_callback(struct rpc_xprt *xprt, 1269 struct xdr_skb_reader *desc) 1270{ 1271 struct sock_xprt *transport = 1272 container_of(xprt, struct sock_xprt, xprt); 1273 struct rpc_rqst *req; 1274 1275 /* Look up and lock the request corresponding to the given XID */ 1276 spin_lock(&xprt->transport_lock); 1277 req = xprt_lookup_bc_request(xprt, transport->tcp_xid); 1278 if (req == NULL) { 1279 spin_unlock(&xprt->transport_lock); 1280 printk(KERN_WARNING "Callback slot table overflowed\n"); 1281 xprt_force_disconnect(xprt); 1282 return -1; 1283 } 1284 1285 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid)); 1286 xs_tcp_read_common(xprt, desc, req); 1287 1288 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) 1289 xprt_complete_bc_request(req, transport->tcp_copied); 1290 spin_unlock(&xprt->transport_lock); 1291 1292 return 0; 1293} 1294 1295static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1296 struct xdr_skb_reader *desc) 1297{ 1298 struct sock_xprt *transport = 1299 container_of(xprt, struct sock_xprt, xprt); 1300 1301 return (transport->tcp_flags & TCP_RPC_REPLY) ? 1302 xs_tcp_read_reply(xprt, desc) : 1303 xs_tcp_read_callback(xprt, desc); 1304} 1305#else 1306static inline int _xs_tcp_read_data(struct rpc_xprt *xprt, 1307 struct xdr_skb_reader *desc) 1308{ 1309 return xs_tcp_read_reply(xprt, desc); 1310} 1311#endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1312 1313/* 1314 * Read data off the transport. This can be either an RPC_CALL or an 1315 * RPC_REPLY. Relay the processing to helper functions. 1316 */ 1317static void xs_tcp_read_data(struct rpc_xprt *xprt, 1318 struct xdr_skb_reader *desc) 1319{ 1320 struct sock_xprt *transport = 1321 container_of(xprt, struct sock_xprt, xprt); 1322 1323 if (_xs_tcp_read_data(xprt, desc) == 0) 1324 xs_tcp_check_fraghdr(transport); 1325 else { 1326 /* 1327 * The transport_lock protects the request handling. 1328 * There's no need to hold it to update the tcp_flags. 1329 */ 1330 transport->tcp_flags &= ~TCP_RCV_COPY_DATA; 1331 } 1332} 1333 1334static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) 1335{ 1336 size_t len; 1337 1338 len = transport->tcp_reclen - transport->tcp_offset; 1339 if (len > desc->count) 1340 len = desc->count; 1341 desc->count -= len; 1342 desc->offset += len; 1343 transport->tcp_offset += len; 1344 dprintk("RPC: discarded %Zu bytes\n", len); 1345 xs_tcp_check_fraghdr(transport); 1346} 1347 1348static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 1349{ 1350 struct rpc_xprt *xprt = rd_desc->arg.data; 1351 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1352 struct xdr_skb_reader desc = { 1353 .skb = skb, 1354 .offset = offset, 1355 .count = len, 1356 }; 1357 1358 dprintk("RPC: xs_tcp_data_recv started\n"); 1359 do { 1360 trace_xs_tcp_data_recv(transport); 1361 /* Read in a new fragment marker if necessary */ 1362 /* Can we ever really expect to get completely empty fragments? */ 1363 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { 1364 xs_tcp_read_fraghdr(xprt, &desc); 1365 continue; 1366 } 1367 /* Read in the xid if necessary */ 1368 if (transport->tcp_flags & TCP_RCV_COPY_XID) { 1369 xs_tcp_read_xid(transport, &desc); 1370 continue; 1371 } 1372 /* Read in the call/reply flag */ 1373 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) { 1374 xs_tcp_read_calldir(transport, &desc); 1375 continue; 1376 } 1377 /* Read in the request data */ 1378 if (transport->tcp_flags & TCP_RCV_COPY_DATA) { 1379 xs_tcp_read_data(xprt, &desc); 1380 continue; 1381 } 1382 /* Skip over any trailing bytes on short reads */ 1383 xs_tcp_read_discard(transport, &desc); 1384 } while (desc.count); 1385 trace_xs_tcp_data_recv(transport); 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 */ 1396static void xs_tcp_data_ready(struct sock *sk) 1397{ 1398 struct rpc_xprt *xprt; 1399 read_descriptor_t rd_desc; 1400 int read; 1401 unsigned long total = 0; 1402 1403 dprintk("RPC: xs_tcp_data_ready...\n"); 1404 1405 read_lock_bh(&sk->sk_callback_lock); 1406 if (!(xprt = xprt_from_sock(sk))) { 1407 read = 0; 1408 goto out; 1409 } 1410 /* Any data means we had a useful conversation, so 1411 * the we don't need to delay the next reconnect 1412 */ 1413 if (xprt->reestablish_timeout) 1414 xprt->reestablish_timeout = 0; 1415 1416 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 1417 rd_desc.arg.data = xprt; 1418 do { 1419 rd_desc.count = 65536; 1420 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 1421 if (read > 0) 1422 total += read; 1423 } while (read > 0); 1424out: 1425 trace_xs_tcp_data_ready(xprt, read, total); 1426 read_unlock_bh(&sk->sk_callback_lock); 1427} 1428 1429/** 1430 * xs_tcp_state_change - callback to handle TCP socket state changes 1431 * @sk: socket whose state has changed 1432 * 1433 */ 1434static void xs_tcp_state_change(struct sock *sk) 1435{ 1436 struct rpc_xprt *xprt; 1437 struct sock_xprt *transport; 1438 1439 read_lock_bh(&sk->sk_callback_lock); 1440 if (!(xprt = xprt_from_sock(sk))) 1441 goto out; 1442 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1443 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1444 sk->sk_state, xprt_connected(xprt), 1445 sock_flag(sk, SOCK_DEAD), 1446 sock_flag(sk, SOCK_ZAPPED), 1447 sk->sk_shutdown); 1448 1449 transport = container_of(xprt, struct sock_xprt, xprt); 1450 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1451 switch (sk->sk_state) { 1452 case TCP_ESTABLISHED: 1453 spin_lock(&xprt->transport_lock); 1454 if (!xprt_test_and_set_connected(xprt)) { 1455 1456 /* Reset TCP record info */ 1457 transport->tcp_offset = 0; 1458 transport->tcp_reclen = 0; 1459 transport->tcp_copied = 0; 1460 transport->tcp_flags = 1461 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; 1462 xprt->connect_cookie++; 1463 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1464 xprt_clear_connecting(xprt); 1465 1466 xprt_wake_pending_tasks(xprt, -EAGAIN); 1467 } 1468 spin_unlock(&xprt->transport_lock); 1469 break; 1470 case TCP_FIN_WAIT1: 1471 /* The client initiated a shutdown of the socket */ 1472 xprt->connect_cookie++; 1473 xprt->reestablish_timeout = 0; 1474 set_bit(XPRT_CLOSING, &xprt->state); 1475 smp_mb__before_atomic(); 1476 clear_bit(XPRT_CONNECTED, &xprt->state); 1477 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1478 smp_mb__after_atomic(); 1479 break; 1480 case TCP_CLOSE_WAIT: 1481 /* The server initiated a shutdown of the socket */ 1482 xprt->connect_cookie++; 1483 clear_bit(XPRT_CONNECTED, &xprt->state); 1484 xs_tcp_force_close(xprt); 1485 case TCP_CLOSING: 1486 /* 1487 * If the server closed down the connection, make sure that 1488 * we back off before reconnecting 1489 */ 1490 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1491 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1492 break; 1493 case TCP_LAST_ACK: 1494 set_bit(XPRT_CLOSING, &xprt->state); 1495 smp_mb__before_atomic(); 1496 clear_bit(XPRT_CONNECTED, &xprt->state); 1497 smp_mb__after_atomic(); 1498 break; 1499 case TCP_CLOSE: 1500 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1501 &transport->sock_state)) 1502 xprt_clear_connecting(xprt); 1503 xs_sock_mark_closed(xprt); 1504 } 1505 out: 1506 read_unlock_bh(&sk->sk_callback_lock); 1507} 1508 1509static void xs_write_space(struct sock *sk) 1510{ 1511 struct socket *sock; 1512 struct rpc_xprt *xprt; 1513 1514 if (unlikely(!(sock = sk->sk_socket))) 1515 return; 1516 clear_bit(SOCK_NOSPACE, &sock->flags); 1517 1518 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1519 return; 1520 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) 1521 return; 1522 1523 xprt_write_space(xprt); 1524} 1525 1526/** 1527 * xs_udp_write_space - callback invoked when socket buffer space 1528 * becomes available 1529 * @sk: socket whose state has changed 1530 * 1531 * Called when more output buffer space is available for this socket. 1532 * We try not to wake our writers until they can make "significant" 1533 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1534 * with a bunch of small requests. 1535 */ 1536static void xs_udp_write_space(struct sock *sk) 1537{ 1538 read_lock_bh(&sk->sk_callback_lock); 1539 1540 /* from net/core/sock.c:sock_def_write_space */ 1541 if (sock_writeable(sk)) 1542 xs_write_space(sk); 1543 1544 read_unlock_bh(&sk->sk_callback_lock); 1545} 1546 1547/** 1548 * xs_tcp_write_space - callback invoked when socket buffer space 1549 * becomes available 1550 * @sk: socket whose state has changed 1551 * 1552 * Called when more output buffer space is available for this socket. 1553 * We try not to wake our writers until they can make "significant" 1554 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1555 * with a bunch of small requests. 1556 */ 1557static void xs_tcp_write_space(struct sock *sk) 1558{ 1559 read_lock_bh(&sk->sk_callback_lock); 1560 1561 /* from net/core/stream.c:sk_stream_write_space */ 1562 if (sk_stream_is_writeable(sk)) 1563 xs_write_space(sk); 1564 1565 read_unlock_bh(&sk->sk_callback_lock); 1566} 1567 1568static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1569{ 1570 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1571 struct sock *sk = transport->inet; 1572 1573 if (transport->rcvsize) { 1574 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1575 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1576 } 1577 if (transport->sndsize) { 1578 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1579 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1580 sk->sk_write_space(sk); 1581 } 1582} 1583 1584/** 1585 * xs_udp_set_buffer_size - set send and receive limits 1586 * @xprt: generic transport 1587 * @sndsize: requested size of send buffer, in bytes 1588 * @rcvsize: requested size of receive buffer, in bytes 1589 * 1590 * Set socket send and receive buffer size limits. 1591 */ 1592static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1593{ 1594 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1595 1596 transport->sndsize = 0; 1597 if (sndsize) 1598 transport->sndsize = sndsize + 1024; 1599 transport->rcvsize = 0; 1600 if (rcvsize) 1601 transport->rcvsize = rcvsize + 1024; 1602 1603 xs_udp_do_set_buffer_size(xprt); 1604} 1605 1606/** 1607 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1608 * @task: task that timed out 1609 * 1610 * Adjust the congestion window after a retransmit timeout has occurred. 1611 */ 1612static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1613{ 1614 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1615} 1616 1617static unsigned short xs_get_random_port(void) 1618{ 1619 unsigned short range = xprt_max_resvport - xprt_min_resvport; 1620 unsigned short rand = (unsigned short) prandom_u32() % range; 1621 return rand + xprt_min_resvport; 1622} 1623 1624/** 1625 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1626 * @sock: socket 1627 * 1628 * Note that this function has to be called on all sockets that share the 1629 * same port, and it must be called before binding. 1630 */ 1631static void xs_sock_set_reuseport(struct socket *sock) 1632{ 1633 int opt = 1; 1634 1635 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1636 (char *)&opt, sizeof(opt)); 1637} 1638 1639static unsigned short xs_sock_getport(struct socket *sock) 1640{ 1641 struct sockaddr_storage buf; 1642 int buflen; 1643 unsigned short port = 0; 1644 1645 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0) 1646 goto out; 1647 switch (buf.ss_family) { 1648 case AF_INET6: 1649 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1650 break; 1651 case AF_INET: 1652 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1653 } 1654out: 1655 return port; 1656} 1657 1658/** 1659 * xs_set_port - reset the port number in the remote endpoint address 1660 * @xprt: generic transport 1661 * @port: new port number 1662 * 1663 */ 1664static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1665{ 1666 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1667 1668 rpc_set_port(xs_addr(xprt), port); 1669 xs_update_peer_port(xprt); 1670} 1671 1672static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1673{ 1674 if (transport->srcport == 0) 1675 transport->srcport = xs_sock_getport(sock); 1676} 1677 1678static unsigned short xs_get_srcport(struct sock_xprt *transport) 1679{ 1680 unsigned short port = transport->srcport; 1681 1682 if (port == 0 && transport->xprt.resvport) 1683 port = xs_get_random_port(); 1684 return port; 1685} 1686 1687static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1688{ 1689 if (transport->srcport != 0) 1690 transport->srcport = 0; 1691 if (!transport->xprt.resvport) 1692 return 0; 1693 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1694 return xprt_max_resvport; 1695 return --port; 1696} 1697static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1698{ 1699 struct sockaddr_storage myaddr; 1700 int err, nloop = 0; 1701 unsigned short port = xs_get_srcport(transport); 1702 unsigned short last; 1703 1704 /* 1705 * If we are asking for any ephemeral port (i.e. port == 0 && 1706 * transport->xprt.resvport == 0), don't bind. Let the local 1707 * port selection happen implicitly when the socket is used 1708 * (for example at connect time). 1709 * 1710 * This ensures that we can continue to establish TCP 1711 * connections even when all local ephemeral ports are already 1712 * a part of some TCP connection. This makes no difference 1713 * for UDP sockets, but also doens't harm them. 1714 * 1715 * If we're asking for any reserved port (i.e. port == 0 && 1716 * transport->xprt.resvport == 1) xs_get_srcport above will 1717 * ensure that port is non-zero and we will bind as needed. 1718 */ 1719 if (port == 0) 1720 return 0; 1721 1722 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1723 do { 1724 rpc_set_port((struct sockaddr *)&myaddr, port); 1725 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1726 transport->xprt.addrlen); 1727 if (err == 0) { 1728 transport->srcport = port; 1729 break; 1730 } 1731 last = port; 1732 port = xs_next_srcport(transport, port); 1733 if (port > last) 1734 nloop++; 1735 } while (err == -EADDRINUSE && nloop != 2); 1736 1737 if (myaddr.ss_family == AF_INET) 1738 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1739 &((struct sockaddr_in *)&myaddr)->sin_addr, 1740 port, err ? "failed" : "ok", err); 1741 else 1742 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1743 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1744 port, err ? "failed" : "ok", err); 1745 return err; 1746} 1747 1748/* 1749 * We don't support autobind on AF_LOCAL sockets 1750 */ 1751static void xs_local_rpcbind(struct rpc_task *task) 1752{ 1753 rcu_read_lock(); 1754 xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt)); 1755 rcu_read_unlock(); 1756} 1757 1758static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1759{ 1760} 1761 1762#ifdef CONFIG_DEBUG_LOCK_ALLOC 1763static struct lock_class_key xs_key[2]; 1764static struct lock_class_key xs_slock_key[2]; 1765 1766static inline void xs_reclassify_socketu(struct socket *sock) 1767{ 1768 struct sock *sk = sock->sk; 1769 1770 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1771 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1772} 1773 1774static inline void xs_reclassify_socket4(struct socket *sock) 1775{ 1776 struct sock *sk = sock->sk; 1777 1778 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1779 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1780} 1781 1782static inline void xs_reclassify_socket6(struct socket *sock) 1783{ 1784 struct sock *sk = sock->sk; 1785 1786 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1787 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1788} 1789 1790static inline void xs_reclassify_socket(int family, struct socket *sock) 1791{ 1792 WARN_ON_ONCE(sock_owned_by_user(sock->sk)); 1793 if (sock_owned_by_user(sock->sk)) 1794 return; 1795 1796 switch (family) { 1797 case AF_LOCAL: 1798 xs_reclassify_socketu(sock); 1799 break; 1800 case AF_INET: 1801 xs_reclassify_socket4(sock); 1802 break; 1803 case AF_INET6: 1804 xs_reclassify_socket6(sock); 1805 break; 1806 } 1807} 1808#else 1809static inline void xs_reclassify_socketu(struct socket *sock) 1810{ 1811} 1812 1813static inline void xs_reclassify_socket4(struct socket *sock) 1814{ 1815} 1816 1817static inline void xs_reclassify_socket6(struct socket *sock) 1818{ 1819} 1820 1821static inline void xs_reclassify_socket(int family, struct socket *sock) 1822{ 1823} 1824#endif 1825 1826static void xs_dummy_setup_socket(struct work_struct *work) 1827{ 1828} 1829 1830static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1831 struct sock_xprt *transport, int family, int type, 1832 int protocol, bool reuseport) 1833{ 1834 struct socket *sock; 1835 int err; 1836 1837 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1838 if (err < 0) { 1839 dprintk("RPC: can't create %d transport socket (%d).\n", 1840 protocol, -err); 1841 goto out; 1842 } 1843 xs_reclassify_socket(family, sock); 1844 1845 if (reuseport) 1846 xs_sock_set_reuseport(sock); 1847 1848 err = xs_bind(transport, sock); 1849 if (err) { 1850 sock_release(sock); 1851 goto out; 1852 } 1853 1854 return sock; 1855out: 1856 return ERR_PTR(err); 1857} 1858 1859static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1860 struct socket *sock) 1861{ 1862 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1863 xprt); 1864 1865 if (!transport->inet) { 1866 struct sock *sk = sock->sk; 1867 1868 write_lock_bh(&sk->sk_callback_lock); 1869 1870 xs_save_old_callbacks(transport, sk); 1871 1872 sk->sk_user_data = xprt; 1873 sk->sk_data_ready = xs_local_data_ready; 1874 sk->sk_write_space = xs_udp_write_space; 1875 sk->sk_error_report = xs_error_report; 1876 sk->sk_allocation = GFP_ATOMIC; 1877 1878 xprt_clear_connected(xprt); 1879 1880 /* Reset to new socket */ 1881 transport->sock = sock; 1882 transport->inet = sk; 1883 1884 write_unlock_bh(&sk->sk_callback_lock); 1885 } 1886 1887 /* Tell the socket layer to start connecting... */ 1888 xprt->stat.connect_count++; 1889 xprt->stat.connect_start = jiffies; 1890 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1891} 1892 1893/** 1894 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1895 * @xprt: RPC transport to connect 1896 * @transport: socket transport to connect 1897 * @create_sock: function to create a socket of the correct type 1898 */ 1899static int xs_local_setup_socket(struct sock_xprt *transport) 1900{ 1901 struct rpc_xprt *xprt = &transport->xprt; 1902 struct socket *sock; 1903 int status = -EIO; 1904 1905 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1906 SOCK_STREAM, 0, &sock, 1); 1907 if (status < 0) { 1908 dprintk("RPC: can't create AF_LOCAL " 1909 "transport socket (%d).\n", -status); 1910 goto out; 1911 } 1912 xs_reclassify_socketu(sock); 1913 1914 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1915 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1916 1917 status = xs_local_finish_connecting(xprt, sock); 1918 trace_rpc_socket_connect(xprt, sock, status); 1919 switch (status) { 1920 case 0: 1921 dprintk("RPC: xprt %p connected to %s\n", 1922 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1923 xprt_set_connected(xprt); 1924 case -ENOBUFS: 1925 break; 1926 case -ENOENT: 1927 dprintk("RPC: xprt %p: socket %s does not exist\n", 1928 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1929 break; 1930 case -ECONNREFUSED: 1931 dprintk("RPC: xprt %p: connection refused for %s\n", 1932 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1933 break; 1934 default: 1935 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1936 __func__, -status, 1937 xprt->address_strings[RPC_DISPLAY_ADDR]); 1938 } 1939 1940out: 1941 xprt_clear_connecting(xprt); 1942 xprt_wake_pending_tasks(xprt, status); 1943 return status; 1944} 1945 1946static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1947{ 1948 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1949 int ret; 1950 1951 if (RPC_IS_ASYNC(task)) { 1952 /* 1953 * We want the AF_LOCAL connect to be resolved in the 1954 * filesystem namespace of the process making the rpc 1955 * call. Thus we connect synchronously. 1956 * 1957 * If we want to support asynchronous AF_LOCAL calls, 1958 * we'll need to figure out how to pass a namespace to 1959 * connect. 1960 */ 1961 rpc_exit(task, -ENOTCONN); 1962 return; 1963 } 1964 ret = xs_local_setup_socket(transport); 1965 if (ret && !RPC_IS_SOFTCONN(task)) 1966 msleep_interruptible(15000); 1967} 1968 1969#ifdef CONFIG_SUNRPC_SWAP 1970static void xs_set_memalloc(struct rpc_xprt *xprt) 1971{ 1972 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1973 xprt); 1974 1975 if (xprt->swapper) 1976 sk_set_memalloc(transport->inet); 1977} 1978 1979/** 1980 * xs_swapper - Tag this transport as being used for swap. 1981 * @xprt: transport to tag 1982 * @enable: enable/disable 1983 * 1984 */ 1985int xs_swapper(struct rpc_xprt *xprt, int enable) 1986{ 1987 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1988 xprt); 1989 int err = 0; 1990 1991 if (enable) { 1992 xprt->swapper++; 1993 xs_set_memalloc(xprt); 1994 } else if (xprt->swapper) { 1995 xprt->swapper--; 1996 sk_clear_memalloc(transport->inet); 1997 } 1998 1999 return err; 2000} 2001EXPORT_SYMBOL_GPL(xs_swapper); 2002#else 2003static void xs_set_memalloc(struct rpc_xprt *xprt) 2004{ 2005} 2006#endif 2007 2008static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2009{ 2010 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2011 2012 if (!transport->inet) { 2013 struct sock *sk = sock->sk; 2014 2015 write_lock_bh(&sk->sk_callback_lock); 2016 2017 xs_save_old_callbacks(transport, sk); 2018 2019 sk->sk_user_data = xprt; 2020 sk->sk_data_ready = xs_udp_data_ready; 2021 sk->sk_write_space = xs_udp_write_space; 2022 sk->sk_allocation = GFP_ATOMIC; 2023 2024 xprt_set_connected(xprt); 2025 2026 /* Reset to new socket */ 2027 transport->sock = sock; 2028 transport->inet = sk; 2029 2030 xs_set_memalloc(xprt); 2031 2032 write_unlock_bh(&sk->sk_callback_lock); 2033 } 2034 xs_udp_do_set_buffer_size(xprt); 2035} 2036 2037static void xs_udp_setup_socket(struct work_struct *work) 2038{ 2039 struct sock_xprt *transport = 2040 container_of(work, struct sock_xprt, connect_worker.work); 2041 struct rpc_xprt *xprt = &transport->xprt; 2042 struct socket *sock = transport->sock; 2043 int status = -EIO; 2044 2045 sock = xs_create_sock(xprt, transport, 2046 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2047 IPPROTO_UDP, false); 2048 if (IS_ERR(sock)) 2049 goto out; 2050 2051 dprintk("RPC: worker connecting xprt %p via %s to " 2052 "%s (port %s)\n", xprt, 2053 xprt->address_strings[RPC_DISPLAY_PROTO], 2054 xprt->address_strings[RPC_DISPLAY_ADDR], 2055 xprt->address_strings[RPC_DISPLAY_PORT]); 2056 2057 xs_udp_finish_connecting(xprt, sock); 2058 trace_rpc_socket_connect(xprt, sock, 0); 2059 status = 0; 2060out: 2061 xprt_unlock_connect(xprt, transport); 2062 xprt_clear_connecting(xprt); 2063 xprt_wake_pending_tasks(xprt, status); 2064} 2065 2066static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2067{ 2068 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2069 int ret = -ENOTCONN; 2070 2071 if (!transport->inet) { 2072 struct sock *sk = sock->sk; 2073 unsigned int keepidle = xprt->timeout->to_initval / HZ; 2074 unsigned int keepcnt = xprt->timeout->to_retries + 1; 2075 unsigned int opt_on = 1; 2076 2077 /* TCP Keepalive options */ 2078 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2079 (char *)&opt_on, sizeof(opt_on)); 2080 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2081 (char *)&keepidle, sizeof(keepidle)); 2082 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2083 (char *)&keepidle, sizeof(keepidle)); 2084 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2085 (char *)&keepcnt, sizeof(keepcnt)); 2086 2087 write_lock_bh(&sk->sk_callback_lock); 2088 2089 xs_save_old_callbacks(transport, sk); 2090 2091 sk->sk_user_data = xprt; 2092 sk->sk_data_ready = xs_tcp_data_ready; 2093 sk->sk_state_change = xs_tcp_state_change; 2094 sk->sk_write_space = xs_tcp_write_space; 2095 sk->sk_error_report = xs_error_report; 2096 sk->sk_allocation = GFP_ATOMIC; 2097 2098 /* socket options */ 2099 sock_reset_flag(sk, SOCK_LINGER); 2100 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2101 2102 xprt_clear_connected(xprt); 2103 2104 /* Reset to new socket */ 2105 transport->sock = sock; 2106 transport->inet = sk; 2107 2108 write_unlock_bh(&sk->sk_callback_lock); 2109 } 2110 2111 if (!xprt_bound(xprt)) 2112 goto out; 2113 2114 xs_set_memalloc(xprt); 2115 2116 /* Tell the socket layer to start connecting... */ 2117 xprt->stat.connect_count++; 2118 xprt->stat.connect_start = jiffies; 2119 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2120 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2121 switch (ret) { 2122 case 0: 2123 xs_set_srcport(transport, sock); 2124 case -EINPROGRESS: 2125 /* SYN_SENT! */ 2126 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2127 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2128 } 2129out: 2130 return ret; 2131} 2132 2133/** 2134 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2135 * @xprt: RPC transport to connect 2136 * @transport: socket transport to connect 2137 * @create_sock: function to create a socket of the correct type 2138 * 2139 * Invoked by a work queue tasklet. 2140 */ 2141static void xs_tcp_setup_socket(struct work_struct *work) 2142{ 2143 struct sock_xprt *transport = 2144 container_of(work, struct sock_xprt, connect_worker.work); 2145 struct socket *sock = transport->sock; 2146 struct rpc_xprt *xprt = &transport->xprt; 2147 int status = -EIO; 2148 2149 if (!sock) { 2150 sock = xs_create_sock(xprt, transport, 2151 xs_addr(xprt)->sa_family, SOCK_STREAM, 2152 IPPROTO_TCP, true); 2153 if (IS_ERR(sock)) { 2154 status = PTR_ERR(sock); 2155 goto out; 2156 } 2157 } 2158 2159 dprintk("RPC: worker connecting xprt %p via %s to " 2160 "%s (port %s)\n", xprt, 2161 xprt->address_strings[RPC_DISPLAY_PROTO], 2162 xprt->address_strings[RPC_DISPLAY_ADDR], 2163 xprt->address_strings[RPC_DISPLAY_PORT]); 2164 2165 status = xs_tcp_finish_connecting(xprt, sock); 2166 trace_rpc_socket_connect(xprt, sock, status); 2167 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2168 xprt, -status, xprt_connected(xprt), 2169 sock->sk->sk_state); 2170 switch (status) { 2171 default: 2172 printk("%s: connect returned unhandled error %d\n", 2173 __func__, status); 2174 case -EADDRNOTAVAIL: 2175 /* We're probably in TIME_WAIT. Get rid of existing socket, 2176 * and retry 2177 */ 2178 xs_tcp_force_close(xprt); 2179 break; 2180 case 0: 2181 case -EINPROGRESS: 2182 case -EALREADY: 2183 xprt_unlock_connect(xprt, transport); 2184 return; 2185 case -EINVAL: 2186 /* Happens, for instance, if the user specified a link 2187 * local IPv6 address without a scope-id. 2188 */ 2189 case -ECONNREFUSED: 2190 case -ECONNRESET: 2191 case -ENETUNREACH: 2192 case -EADDRINUSE: 2193 case -ENOBUFS: 2194 /* retry with existing socket, after a delay */ 2195 xs_tcp_force_close(xprt); 2196 goto out; 2197 } 2198 status = -EAGAIN; 2199out: 2200 xprt_unlock_connect(xprt, transport); 2201 xprt_clear_connecting(xprt); 2202 xprt_wake_pending_tasks(xprt, status); 2203} 2204 2205/** 2206 * xs_connect - connect a socket to a remote endpoint 2207 * @xprt: pointer to transport structure 2208 * @task: address of RPC task that manages state of connect request 2209 * 2210 * TCP: If the remote end dropped the connection, delay reconnecting. 2211 * 2212 * UDP socket connects are synchronous, but we use a work queue anyway 2213 * to guarantee that even unprivileged user processes can set up a 2214 * socket on a privileged port. 2215 * 2216 * If a UDP socket connect fails, the delay behavior here prevents 2217 * retry floods (hard mounts). 2218 */ 2219static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2220{ 2221 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2222 2223 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2224 2225 if (transport->sock != NULL) { 2226 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2227 "seconds\n", 2228 xprt, xprt->reestablish_timeout / HZ); 2229 2230 /* Start by resetting any existing state */ 2231 xs_reset_transport(transport); 2232 2233 queue_delayed_work(rpciod_workqueue, 2234 &transport->connect_worker, 2235 xprt->reestablish_timeout); 2236 xprt->reestablish_timeout <<= 1; 2237 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2238 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2239 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 2240 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 2241 } else { 2242 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2243 queue_delayed_work(rpciod_workqueue, 2244 &transport->connect_worker, 0); 2245 } 2246} 2247 2248/** 2249 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2250 * @xprt: rpc_xprt struct containing statistics 2251 * @seq: output file 2252 * 2253 */ 2254static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2255{ 2256 long idle_time = 0; 2257 2258 if (xprt_connected(xprt)) 2259 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2260 2261 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2262 "%llu %llu %lu %llu %llu\n", 2263 xprt->stat.bind_count, 2264 xprt->stat.connect_count, 2265 xprt->stat.connect_time, 2266 idle_time, 2267 xprt->stat.sends, 2268 xprt->stat.recvs, 2269 xprt->stat.bad_xids, 2270 xprt->stat.req_u, 2271 xprt->stat.bklog_u, 2272 xprt->stat.max_slots, 2273 xprt->stat.sending_u, 2274 xprt->stat.pending_u); 2275} 2276 2277/** 2278 * xs_udp_print_stats - display UDP socket-specifc stats 2279 * @xprt: rpc_xprt struct containing statistics 2280 * @seq: output file 2281 * 2282 */ 2283static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2284{ 2285 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2286 2287 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2288 "%lu %llu %llu\n", 2289 transport->srcport, 2290 xprt->stat.bind_count, 2291 xprt->stat.sends, 2292 xprt->stat.recvs, 2293 xprt->stat.bad_xids, 2294 xprt->stat.req_u, 2295 xprt->stat.bklog_u, 2296 xprt->stat.max_slots, 2297 xprt->stat.sending_u, 2298 xprt->stat.pending_u); 2299} 2300 2301/** 2302 * xs_tcp_print_stats - display TCP socket-specifc stats 2303 * @xprt: rpc_xprt struct containing statistics 2304 * @seq: output file 2305 * 2306 */ 2307static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2308{ 2309 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2310 long idle_time = 0; 2311 2312 if (xprt_connected(xprt)) 2313 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2314 2315 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2316 "%llu %llu %lu %llu %llu\n", 2317 transport->srcport, 2318 xprt->stat.bind_count, 2319 xprt->stat.connect_count, 2320 xprt->stat.connect_time, 2321 idle_time, 2322 xprt->stat.sends, 2323 xprt->stat.recvs, 2324 xprt->stat.bad_xids, 2325 xprt->stat.req_u, 2326 xprt->stat.bklog_u, 2327 xprt->stat.max_slots, 2328 xprt->stat.sending_u, 2329 xprt->stat.pending_u); 2330} 2331 2332/* 2333 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2334 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2335 * to use the server side send routines. 2336 */ 2337static void *bc_malloc(struct rpc_task *task, size_t size) 2338{ 2339 struct page *page; 2340 struct rpc_buffer *buf; 2341 2342 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer)); 2343 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) 2344 return NULL; 2345 2346 page = alloc_page(GFP_KERNEL); 2347 if (!page) 2348 return NULL; 2349 2350 buf = page_address(page); 2351 buf->len = PAGE_SIZE; 2352 2353 return buf->data; 2354} 2355 2356/* 2357 * Free the space allocated in the bc_alloc routine 2358 */ 2359static void bc_free(void *buffer) 2360{ 2361 struct rpc_buffer *buf; 2362 2363 if (!buffer) 2364 return; 2365 2366 buf = container_of(buffer, struct rpc_buffer, data); 2367 free_page((unsigned long)buf); 2368} 2369 2370/* 2371 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2372 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2373 */ 2374static int bc_sendto(struct rpc_rqst *req) 2375{ 2376 int len; 2377 struct xdr_buf *xbufp = &req->rq_snd_buf; 2378 struct rpc_xprt *xprt = req->rq_xprt; 2379 struct sock_xprt *transport = 2380 container_of(xprt, struct sock_xprt, xprt); 2381 struct socket *sock = transport->sock; 2382 unsigned long headoff; 2383 unsigned long tailoff; 2384 2385 xs_encode_stream_record_marker(xbufp); 2386 2387 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2388 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2389 len = svc_send_common(sock, xbufp, 2390 virt_to_page(xbufp->head[0].iov_base), headoff, 2391 xbufp->tail[0].iov_base, tailoff); 2392 2393 if (len != xbufp->len) { 2394 printk(KERN_NOTICE "Error sending entire callback!\n"); 2395 len = -EAGAIN; 2396 } 2397 2398 return len; 2399} 2400 2401/* 2402 * The send routine. Borrows from svc_send 2403 */ 2404static int bc_send_request(struct rpc_task *task) 2405{ 2406 struct rpc_rqst *req = task->tk_rqstp; 2407 struct svc_xprt *xprt; 2408 u32 len; 2409 2410 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2411 /* 2412 * Get the server socket associated with this callback xprt 2413 */ 2414 xprt = req->rq_xprt->bc_xprt; 2415 2416 /* 2417 * Grab the mutex to serialize data as the connection is shared 2418 * with the fore channel 2419 */ 2420 if (!mutex_trylock(&xprt->xpt_mutex)) { 2421 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL); 2422 if (!mutex_trylock(&xprt->xpt_mutex)) 2423 return -EAGAIN; 2424 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task); 2425 } 2426 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2427 len = -ENOTCONN; 2428 else 2429 len = bc_sendto(req); 2430 mutex_unlock(&xprt->xpt_mutex); 2431 2432 if (len > 0) 2433 len = 0; 2434 2435 return len; 2436} 2437 2438/* 2439 * The close routine. Since this is client initiated, we do nothing 2440 */ 2441 2442static void bc_close(struct rpc_xprt *xprt) 2443{ 2444} 2445 2446/* 2447 * The xprt destroy routine. Again, because this connection is client 2448 * initiated, we do nothing 2449 */ 2450 2451static void bc_destroy(struct rpc_xprt *xprt) 2452{ 2453 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2454 2455 xs_xprt_free(xprt); 2456 module_put(THIS_MODULE); 2457} 2458 2459static struct rpc_xprt_ops xs_local_ops = { 2460 .reserve_xprt = xprt_reserve_xprt, 2461 .release_xprt = xs_tcp_release_xprt, 2462 .alloc_slot = xprt_alloc_slot, 2463 .rpcbind = xs_local_rpcbind, 2464 .set_port = xs_local_set_port, 2465 .connect = xs_local_connect, 2466 .buf_alloc = rpc_malloc, 2467 .buf_free = rpc_free, 2468 .send_request = xs_local_send_request, 2469 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2470 .close = xs_close, 2471 .destroy = xs_destroy, 2472 .print_stats = xs_local_print_stats, 2473}; 2474 2475static struct rpc_xprt_ops xs_udp_ops = { 2476 .set_buffer_size = xs_udp_set_buffer_size, 2477 .reserve_xprt = xprt_reserve_xprt_cong, 2478 .release_xprt = xprt_release_xprt_cong, 2479 .alloc_slot = xprt_alloc_slot, 2480 .rpcbind = rpcb_getport_async, 2481 .set_port = xs_set_port, 2482 .connect = xs_connect, 2483 .buf_alloc = rpc_malloc, 2484 .buf_free = rpc_free, 2485 .send_request = xs_udp_send_request, 2486 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2487 .timer = xs_udp_timer, 2488 .release_request = xprt_release_rqst_cong, 2489 .close = xs_close, 2490 .destroy = xs_destroy, 2491 .print_stats = xs_udp_print_stats, 2492}; 2493 2494static struct rpc_xprt_ops xs_tcp_ops = { 2495 .reserve_xprt = xprt_reserve_xprt, 2496 .release_xprt = xs_tcp_release_xprt, 2497 .alloc_slot = xprt_lock_and_alloc_slot, 2498 .rpcbind = rpcb_getport_async, 2499 .set_port = xs_set_port, 2500 .connect = xs_connect, 2501 .buf_alloc = rpc_malloc, 2502 .buf_free = rpc_free, 2503 .send_request = xs_tcp_send_request, 2504 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2505 .close = xs_tcp_shutdown, 2506 .destroy = xs_destroy, 2507 .print_stats = xs_tcp_print_stats, 2508}; 2509 2510/* 2511 * The rpc_xprt_ops for the server backchannel 2512 */ 2513 2514static struct rpc_xprt_ops bc_tcp_ops = { 2515 .reserve_xprt = xprt_reserve_xprt, 2516 .release_xprt = xprt_release_xprt, 2517 .alloc_slot = xprt_alloc_slot, 2518 .buf_alloc = bc_malloc, 2519 .buf_free = bc_free, 2520 .send_request = bc_send_request, 2521 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2522 .close = bc_close, 2523 .destroy = bc_destroy, 2524 .print_stats = xs_tcp_print_stats, 2525}; 2526 2527static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2528{ 2529 static const struct sockaddr_in sin = { 2530 .sin_family = AF_INET, 2531 .sin_addr.s_addr = htonl(INADDR_ANY), 2532 }; 2533 static const struct sockaddr_in6 sin6 = { 2534 .sin6_family = AF_INET6, 2535 .sin6_addr = IN6ADDR_ANY_INIT, 2536 }; 2537 2538 switch (family) { 2539 case AF_LOCAL: 2540 break; 2541 case AF_INET: 2542 memcpy(sap, &sin, sizeof(sin)); 2543 break; 2544 case AF_INET6: 2545 memcpy(sap, &sin6, sizeof(sin6)); 2546 break; 2547 default: 2548 dprintk("RPC: %s: Bad address family\n", __func__); 2549 return -EAFNOSUPPORT; 2550 } 2551 return 0; 2552} 2553 2554static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2555 unsigned int slot_table_size, 2556 unsigned int max_slot_table_size) 2557{ 2558 struct rpc_xprt *xprt; 2559 struct sock_xprt *new; 2560 2561 if (args->addrlen > sizeof(xprt->addr)) { 2562 dprintk("RPC: xs_setup_xprt: address too large\n"); 2563 return ERR_PTR(-EBADF); 2564 } 2565 2566 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2567 max_slot_table_size); 2568 if (xprt == NULL) { 2569 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2570 "rpc_xprt\n"); 2571 return ERR_PTR(-ENOMEM); 2572 } 2573 2574 new = container_of(xprt, struct sock_xprt, xprt); 2575 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2576 xprt->addrlen = args->addrlen; 2577 if (args->srcaddr) 2578 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2579 else { 2580 int err; 2581 err = xs_init_anyaddr(args->dstaddr->sa_family, 2582 (struct sockaddr *)&new->srcaddr); 2583 if (err != 0) { 2584 xprt_free(xprt); 2585 return ERR_PTR(err); 2586 } 2587 } 2588 2589 return xprt; 2590} 2591 2592static const struct rpc_timeout xs_local_default_timeout = { 2593 .to_initval = 10 * HZ, 2594 .to_maxval = 10 * HZ, 2595 .to_retries = 2, 2596}; 2597 2598/** 2599 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2600 * @args: rpc transport creation arguments 2601 * 2602 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2603 */ 2604static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2605{ 2606 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2607 struct sock_xprt *transport; 2608 struct rpc_xprt *xprt; 2609 struct rpc_xprt *ret; 2610 2611 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2612 xprt_max_tcp_slot_table_entries); 2613 if (IS_ERR(xprt)) 2614 return xprt; 2615 transport = container_of(xprt, struct sock_xprt, xprt); 2616 2617 xprt->prot = 0; 2618 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2619 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2620 2621 xprt->bind_timeout = XS_BIND_TO; 2622 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2623 xprt->idle_timeout = XS_IDLE_DISC_TO; 2624 2625 xprt->ops = &xs_local_ops; 2626 xprt->timeout = &xs_local_default_timeout; 2627 2628 INIT_DELAYED_WORK(&transport->connect_worker, 2629 xs_dummy_setup_socket); 2630 2631 switch (sun->sun_family) { 2632 case AF_LOCAL: 2633 if (sun->sun_path[0] != '/') { 2634 dprintk("RPC: bad AF_LOCAL address: %s\n", 2635 sun->sun_path); 2636 ret = ERR_PTR(-EINVAL); 2637 goto out_err; 2638 } 2639 xprt_set_bound(xprt); 2640 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2641 ret = ERR_PTR(xs_local_setup_socket(transport)); 2642 if (ret) 2643 goto out_err; 2644 break; 2645 default: 2646 ret = ERR_PTR(-EAFNOSUPPORT); 2647 goto out_err; 2648 } 2649 2650 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2651 xprt->address_strings[RPC_DISPLAY_ADDR]); 2652 2653 if (try_module_get(THIS_MODULE)) 2654 return xprt; 2655 ret = ERR_PTR(-EINVAL); 2656out_err: 2657 xs_xprt_free(xprt); 2658 return ret; 2659} 2660 2661static const struct rpc_timeout xs_udp_default_timeout = { 2662 .to_initval = 5 * HZ, 2663 .to_maxval = 30 * HZ, 2664 .to_increment = 5 * HZ, 2665 .to_retries = 5, 2666}; 2667 2668/** 2669 * xs_setup_udp - Set up transport to use a UDP socket 2670 * @args: rpc transport creation arguments 2671 * 2672 */ 2673static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2674{ 2675 struct sockaddr *addr = args->dstaddr; 2676 struct rpc_xprt *xprt; 2677 struct sock_xprt *transport; 2678 struct rpc_xprt *ret; 2679 2680 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2681 xprt_udp_slot_table_entries); 2682 if (IS_ERR(xprt)) 2683 return xprt; 2684 transport = container_of(xprt, struct sock_xprt, xprt); 2685 2686 xprt->prot = IPPROTO_UDP; 2687 xprt->tsh_size = 0; 2688 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2689 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2690 2691 xprt->bind_timeout = XS_BIND_TO; 2692 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2693 xprt->idle_timeout = XS_IDLE_DISC_TO; 2694 2695 xprt->ops = &xs_udp_ops; 2696 2697 xprt->timeout = &xs_udp_default_timeout; 2698 2699 switch (addr->sa_family) { 2700 case AF_INET: 2701 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2702 xprt_set_bound(xprt); 2703 2704 INIT_DELAYED_WORK(&transport->connect_worker, 2705 xs_udp_setup_socket); 2706 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2707 break; 2708 case AF_INET6: 2709 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2710 xprt_set_bound(xprt); 2711 2712 INIT_DELAYED_WORK(&transport->connect_worker, 2713 xs_udp_setup_socket); 2714 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2715 break; 2716 default: 2717 ret = ERR_PTR(-EAFNOSUPPORT); 2718 goto out_err; 2719 } 2720 2721 if (xprt_bound(xprt)) 2722 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2723 xprt->address_strings[RPC_DISPLAY_ADDR], 2724 xprt->address_strings[RPC_DISPLAY_PORT], 2725 xprt->address_strings[RPC_DISPLAY_PROTO]); 2726 else 2727 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2728 xprt->address_strings[RPC_DISPLAY_ADDR], 2729 xprt->address_strings[RPC_DISPLAY_PROTO]); 2730 2731 if (try_module_get(THIS_MODULE)) 2732 return xprt; 2733 ret = ERR_PTR(-EINVAL); 2734out_err: 2735 xs_xprt_free(xprt); 2736 return ret; 2737} 2738 2739static const struct rpc_timeout xs_tcp_default_timeout = { 2740 .to_initval = 60 * HZ, 2741 .to_maxval = 60 * HZ, 2742 .to_retries = 2, 2743}; 2744 2745/** 2746 * xs_setup_tcp - Set up transport to use a TCP socket 2747 * @args: rpc transport creation arguments 2748 * 2749 */ 2750static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2751{ 2752 struct sockaddr *addr = args->dstaddr; 2753 struct rpc_xprt *xprt; 2754 struct sock_xprt *transport; 2755 struct rpc_xprt *ret; 2756 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2757 2758 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2759 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2760 2761 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2762 max_slot_table_size); 2763 if (IS_ERR(xprt)) 2764 return xprt; 2765 transport = container_of(xprt, struct sock_xprt, xprt); 2766 2767 xprt->prot = IPPROTO_TCP; 2768 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2769 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2770 2771 xprt->bind_timeout = XS_BIND_TO; 2772 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2773 xprt->idle_timeout = XS_IDLE_DISC_TO; 2774 2775 xprt->ops = &xs_tcp_ops; 2776 xprt->timeout = &xs_tcp_default_timeout; 2777 2778 switch (addr->sa_family) { 2779 case AF_INET: 2780 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2781 xprt_set_bound(xprt); 2782 2783 INIT_DELAYED_WORK(&transport->connect_worker, 2784 xs_tcp_setup_socket); 2785 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2786 break; 2787 case AF_INET6: 2788 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2789 xprt_set_bound(xprt); 2790 2791 INIT_DELAYED_WORK(&transport->connect_worker, 2792 xs_tcp_setup_socket); 2793 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2794 break; 2795 default: 2796 ret = ERR_PTR(-EAFNOSUPPORT); 2797 goto out_err; 2798 } 2799 2800 if (xprt_bound(xprt)) 2801 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2802 xprt->address_strings[RPC_DISPLAY_ADDR], 2803 xprt->address_strings[RPC_DISPLAY_PORT], 2804 xprt->address_strings[RPC_DISPLAY_PROTO]); 2805 else 2806 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2807 xprt->address_strings[RPC_DISPLAY_ADDR], 2808 xprt->address_strings[RPC_DISPLAY_PROTO]); 2809 2810 if (try_module_get(THIS_MODULE)) 2811 return xprt; 2812 ret = ERR_PTR(-EINVAL); 2813out_err: 2814 xs_xprt_free(xprt); 2815 return ret; 2816} 2817 2818/** 2819 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 2820 * @args: rpc transport creation arguments 2821 * 2822 */ 2823static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 2824{ 2825 struct sockaddr *addr = args->dstaddr; 2826 struct rpc_xprt *xprt; 2827 struct sock_xprt *transport; 2828 struct svc_sock *bc_sock; 2829 struct rpc_xprt *ret; 2830 2831 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2832 xprt_tcp_slot_table_entries); 2833 if (IS_ERR(xprt)) 2834 return xprt; 2835 transport = container_of(xprt, struct sock_xprt, xprt); 2836 2837 xprt->prot = IPPROTO_TCP; 2838 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 2839 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2840 xprt->timeout = &xs_tcp_default_timeout; 2841 2842 /* backchannel */ 2843 xprt_set_bound(xprt); 2844 xprt->bind_timeout = 0; 2845 xprt->reestablish_timeout = 0; 2846 xprt->idle_timeout = 0; 2847 2848 xprt->ops = &bc_tcp_ops; 2849 2850 switch (addr->sa_family) { 2851 case AF_INET: 2852 xs_format_peer_addresses(xprt, "tcp", 2853 RPCBIND_NETID_TCP); 2854 break; 2855 case AF_INET6: 2856 xs_format_peer_addresses(xprt, "tcp", 2857 RPCBIND_NETID_TCP6); 2858 break; 2859 default: 2860 ret = ERR_PTR(-EAFNOSUPPORT); 2861 goto out_err; 2862 } 2863 2864 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2865 xprt->address_strings[RPC_DISPLAY_ADDR], 2866 xprt->address_strings[RPC_DISPLAY_PORT], 2867 xprt->address_strings[RPC_DISPLAY_PROTO]); 2868 2869 /* 2870 * Once we've associated a backchannel xprt with a connection, 2871 * we want to keep it around as long as the connection lasts, 2872 * in case we need to start using it for a backchannel again; 2873 * this reference won't be dropped until bc_xprt is destroyed. 2874 */ 2875 xprt_get(xprt); 2876 args->bc_xprt->xpt_bc_xprt = xprt; 2877 xprt->bc_xprt = args->bc_xprt; 2878 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 2879 transport->sock = bc_sock->sk_sock; 2880 transport->inet = bc_sock->sk_sk; 2881 2882 /* 2883 * Since we don't want connections for the backchannel, we set 2884 * the xprt status to connected 2885 */ 2886 xprt_set_connected(xprt); 2887 2888 if (try_module_get(THIS_MODULE)) 2889 return xprt; 2890 2891 args->bc_xprt->xpt_bc_xprt = NULL; 2892 xprt_put(xprt); 2893 ret = ERR_PTR(-EINVAL); 2894out_err: 2895 xs_xprt_free(xprt); 2896 return ret; 2897} 2898 2899static struct xprt_class xs_local_transport = { 2900 .list = LIST_HEAD_INIT(xs_local_transport.list), 2901 .name = "named UNIX socket", 2902 .owner = THIS_MODULE, 2903 .ident = XPRT_TRANSPORT_LOCAL, 2904 .setup = xs_setup_local, 2905}; 2906 2907static struct xprt_class xs_udp_transport = { 2908 .list = LIST_HEAD_INIT(xs_udp_transport.list), 2909 .name = "udp", 2910 .owner = THIS_MODULE, 2911 .ident = XPRT_TRANSPORT_UDP, 2912 .setup = xs_setup_udp, 2913}; 2914 2915static struct xprt_class xs_tcp_transport = { 2916 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 2917 .name = "tcp", 2918 .owner = THIS_MODULE, 2919 .ident = XPRT_TRANSPORT_TCP, 2920 .setup = xs_setup_tcp, 2921}; 2922 2923static struct xprt_class xs_bc_tcp_transport = { 2924 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 2925 .name = "tcp NFSv4.1 backchannel", 2926 .owner = THIS_MODULE, 2927 .ident = XPRT_TRANSPORT_BC_TCP, 2928 .setup = xs_setup_bc_tcp, 2929}; 2930 2931/** 2932 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 2933 * 2934 */ 2935int init_socket_xprt(void) 2936{ 2937#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 2938 if (!sunrpc_table_header) 2939 sunrpc_table_header = register_sysctl_table(sunrpc_table); 2940#endif 2941 2942 xprt_register_transport(&xs_local_transport); 2943 xprt_register_transport(&xs_udp_transport); 2944 xprt_register_transport(&xs_tcp_transport); 2945 xprt_register_transport(&xs_bc_tcp_transport); 2946 2947 return 0; 2948} 2949 2950/** 2951 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 2952 * 2953 */ 2954void cleanup_socket_xprt(void) 2955{ 2956#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 2957 if (sunrpc_table_header) { 2958 unregister_sysctl_table(sunrpc_table_header); 2959 sunrpc_table_header = NULL; 2960 } 2961#endif 2962 2963 xprt_unregister_transport(&xs_local_transport); 2964 xprt_unregister_transport(&xs_udp_transport); 2965 xprt_unregister_transport(&xs_tcp_transport); 2966 xprt_unregister_transport(&xs_bc_tcp_transport); 2967} 2968 2969static int param_set_uint_minmax(const char *val, 2970 const struct kernel_param *kp, 2971 unsigned int min, unsigned int max) 2972{ 2973 unsigned int num; 2974 int ret; 2975 2976 if (!val) 2977 return -EINVAL; 2978 ret = kstrtouint(val, 0, &num); 2979 if (ret == -EINVAL || num < min || num > max) 2980 return -EINVAL; 2981 *((unsigned int *)kp->arg) = num; 2982 return 0; 2983} 2984 2985static int param_set_portnr(const char *val, const struct kernel_param *kp) 2986{ 2987 return param_set_uint_minmax(val, kp, 2988 RPC_MIN_RESVPORT, 2989 RPC_MAX_RESVPORT); 2990} 2991 2992static struct kernel_param_ops param_ops_portnr = { 2993 .set = param_set_portnr, 2994 .get = param_get_uint, 2995}; 2996 2997#define param_check_portnr(name, p) \ 2998 __param_check(name, p, unsigned int); 2999 3000module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3001module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3002 3003static int param_set_slot_table_size(const char *val, 3004 const struct kernel_param *kp) 3005{ 3006 return param_set_uint_minmax(val, kp, 3007 RPC_MIN_SLOT_TABLE, 3008 RPC_MAX_SLOT_TABLE); 3009} 3010 3011static struct kernel_param_ops param_ops_slot_table_size = { 3012 .set = param_set_slot_table_size, 3013 .get = param_get_uint, 3014}; 3015 3016#define param_check_slot_table_size(name, p) \ 3017 __param_check(name, p, unsigned int); 3018 3019static int param_set_max_slot_table_size(const char *val, 3020 const struct kernel_param *kp) 3021{ 3022 return param_set_uint_minmax(val, kp, 3023 RPC_MIN_SLOT_TABLE, 3024 RPC_MAX_SLOT_TABLE_LIMIT); 3025} 3026 3027static struct kernel_param_ops param_ops_max_slot_table_size = { 3028 .set = param_set_max_slot_table_size, 3029 .get = param_get_uint, 3030}; 3031 3032#define param_check_max_slot_table_size(name, p) \ 3033 __param_check(name, p, unsigned int); 3034 3035module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3036 slot_table_size, 0644); 3037module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3038 max_slot_table_size, 0644); 3039module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3040 slot_table_size, 0644); 3041 3042