linux/net/sunrpc/xprtsock.c
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   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/xprtsock.h>
  36#include <linux/file.h>
  37
  38#include <net/sock.h>
  39#include <net/checksum.h>
  40#include <net/udp.h>
  41#include <net/tcp.h>
  42
  43/*
  44 * xprtsock tunables
  45 */
  46unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  47unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  48
  49unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  50unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  51
  52/*
  53 * We can register our own files under /proc/sys/sunrpc by
  54 * calling register_sysctl_table() again.  The files in that
  55 * directory become the union of all files registered there.
  56 *
  57 * We simply need to make sure that we don't collide with
  58 * someone else's file names!
  59 */
  60
  61#ifdef RPC_DEBUG
  62
  63static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  64static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  65static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  66static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  67
  68static struct ctl_table_header *sunrpc_table_header;
  69
  70/*
  71 * FIXME: changing the UDP slot table size should also resize the UDP
  72 *        socket buffers for existing UDP transports
  73 */
  74static ctl_table xs_tunables_table[] = {
  75        {
  76                .ctl_name       = CTL_SLOTTABLE_UDP,
  77                .procname       = "udp_slot_table_entries",
  78                .data           = &xprt_udp_slot_table_entries,
  79                .maxlen         = sizeof(unsigned int),
  80                .mode           = 0644,
  81                .proc_handler   = &proc_dointvec_minmax,
  82                .strategy       = &sysctl_intvec,
  83                .extra1         = &min_slot_table_size,
  84                .extra2         = &max_slot_table_size
  85        },
  86        {
  87                .ctl_name       = CTL_SLOTTABLE_TCP,
  88                .procname       = "tcp_slot_table_entries",
  89                .data           = &xprt_tcp_slot_table_entries,
  90                .maxlen         = sizeof(unsigned int),
  91                .mode           = 0644,
  92                .proc_handler   = &proc_dointvec_minmax,
  93                .strategy       = &sysctl_intvec,
  94                .extra1         = &min_slot_table_size,
  95                .extra2         = &max_slot_table_size
  96        },
  97        {
  98                .ctl_name       = CTL_MIN_RESVPORT,
  99                .procname       = "min_resvport",
 100                .data           = &xprt_min_resvport,
 101                .maxlen         = sizeof(unsigned int),
 102                .mode           = 0644,
 103                .proc_handler   = &proc_dointvec_minmax,
 104                .strategy       = &sysctl_intvec,
 105                .extra1         = &xprt_min_resvport_limit,
 106                .extra2         = &xprt_max_resvport_limit
 107        },
 108        {
 109                .ctl_name       = CTL_MAX_RESVPORT,
 110                .procname       = "max_resvport",
 111                .data           = &xprt_max_resvport,
 112                .maxlen         = sizeof(unsigned int),
 113                .mode           = 0644,
 114                .proc_handler   = &proc_dointvec_minmax,
 115                .strategy       = &sysctl_intvec,
 116                .extra1         = &xprt_min_resvport_limit,
 117                .extra2         = &xprt_max_resvport_limit
 118        },
 119        {
 120                .ctl_name = 0,
 121        },
 122};
 123
 124static ctl_table sunrpc_table[] = {
 125        {
 126                .ctl_name       = CTL_SUNRPC,
 127                .procname       = "sunrpc",
 128                .mode           = 0555,
 129                .child          = xs_tunables_table
 130        },
 131        {
 132                .ctl_name = 0,
 133        },
 134};
 135
 136#endif
 137
 138/*
 139 * Time out for an RPC UDP socket connect.  UDP socket connects are
 140 * synchronous, but we set a timeout anyway in case of resource
 141 * exhaustion on the local host.
 142 */
 143#define XS_UDP_CONN_TO          (5U * HZ)
 144
 145/*
 146 * Wait duration for an RPC TCP connection to be established.  Solaris
 147 * NFS over TCP uses 60 seconds, for example, which is in line with how
 148 * long a server takes to reboot.
 149 */
 150#define XS_TCP_CONN_TO          (60U * HZ)
 151
 152/*
 153 * Wait duration for a reply from the RPC portmapper.
 154 */
 155#define XS_BIND_TO              (60U * HZ)
 156
 157/*
 158 * Delay if a UDP socket connect error occurs.  This is most likely some
 159 * kind of resource problem on the local host.
 160 */
 161#define XS_UDP_REEST_TO         (2U * HZ)
 162
 163/*
 164 * The reestablish timeout allows clients to delay for a bit before attempting
 165 * to reconnect to a server that just dropped our connection.
 166 *
 167 * We implement an exponential backoff when trying to reestablish a TCP
 168 * transport connection with the server.  Some servers like to drop a TCP
 169 * connection when they are overworked, so we start with a short timeout and
 170 * increase over time if the server is down or not responding.
 171 */
 172#define XS_TCP_INIT_REEST_TO    (3U * HZ)
 173#define XS_TCP_MAX_REEST_TO     (5U * 60 * HZ)
 174
 175/*
 176 * TCP idle timeout; client drops the transport socket if it is idle
 177 * for this long.  Note that we also timeout UDP sockets to prevent
 178 * holding port numbers when there is no RPC traffic.
 179 */
 180#define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 181
 182#ifdef RPC_DEBUG
 183# undef  RPC_DEBUG_DATA
 184# define RPCDBG_FACILITY        RPCDBG_TRANS
 185#endif
 186
 187#ifdef RPC_DEBUG_DATA
 188static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 189{
 190        u8 *buf = (u8 *) packet;
 191        int j;
 192
 193        dprintk("RPC:       %s\n", msg);
 194        for (j = 0; j < count && j < 128; j += 4) {
 195                if (!(j & 31)) {
 196                        if (j)
 197                                dprintk("\n");
 198                        dprintk("0x%04x ", j);
 199                }
 200                dprintk("%02x%02x%02x%02x ",
 201                        buf[j], buf[j+1], buf[j+2], buf[j+3]);
 202        }
 203        dprintk("\n");
 204}
 205#else
 206static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 207{
 208        /* NOP */
 209}
 210#endif
 211
 212struct sock_xprt {
 213        struct rpc_xprt         xprt;
 214
 215        /*
 216         * Network layer
 217         */
 218        struct socket *         sock;
 219        struct sock *           inet;
 220
 221        /*
 222         * State of TCP reply receive
 223         */
 224        __be32                  tcp_fraghdr,
 225                                tcp_xid;
 226
 227        u32                     tcp_offset,
 228                                tcp_reclen;
 229
 230        unsigned long           tcp_copied,
 231                                tcp_flags;
 232
 233        /*
 234         * Connection of transports
 235         */
 236        struct delayed_work     connect_worker;
 237        struct sockaddr_storage addr;
 238        unsigned short          port;
 239
 240        /*
 241         * UDP socket buffer size parameters
 242         */
 243        size_t                  rcvsize,
 244                                sndsize;
 245
 246        /*
 247         * Saved socket callback addresses
 248         */
 249        void                    (*old_data_ready)(struct sock *, int);
 250        void                    (*old_state_change)(struct sock *);
 251        void                    (*old_write_space)(struct sock *);
 252        void                    (*old_error_report)(struct sock *);
 253};
 254
 255/*
 256 * TCP receive state flags
 257 */
 258#define TCP_RCV_LAST_FRAG       (1UL << 0)
 259#define TCP_RCV_COPY_FRAGHDR    (1UL << 1)
 260#define TCP_RCV_COPY_XID        (1UL << 2)
 261#define TCP_RCV_COPY_DATA       (1UL << 3)
 262
 263static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 264{
 265        return (struct sockaddr *) &xprt->addr;
 266}
 267
 268static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
 269{
 270        return (struct sockaddr_in *) &xprt->addr;
 271}
 272
 273static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
 274{
 275        return (struct sockaddr_in6 *) &xprt->addr;
 276}
 277
 278static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt,
 279                                          const char *protocol,
 280                                          const char *netid)
 281{
 282        struct sockaddr_in *addr = xs_addr_in(xprt);
 283        char *buf;
 284
 285        buf = kzalloc(20, GFP_KERNEL);
 286        if (buf) {
 287                snprintf(buf, 20, NIPQUAD_FMT,
 288                                NIPQUAD(addr->sin_addr.s_addr));
 289        }
 290        xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
 291
 292        buf = kzalloc(8, GFP_KERNEL);
 293        if (buf) {
 294                snprintf(buf, 8, "%u",
 295                                ntohs(addr->sin_port));
 296        }
 297        xprt->address_strings[RPC_DISPLAY_PORT] = buf;
 298
 299        xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 300
 301        buf = kzalloc(48, GFP_KERNEL);
 302        if (buf) {
 303                snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
 304                        NIPQUAD(addr->sin_addr.s_addr),
 305                        ntohs(addr->sin_port),
 306                        protocol);
 307        }
 308        xprt->address_strings[RPC_DISPLAY_ALL] = buf;
 309
 310        buf = kzalloc(10, GFP_KERNEL);
 311        if (buf) {
 312                snprintf(buf, 10, "%02x%02x%02x%02x",
 313                                NIPQUAD(addr->sin_addr.s_addr));
 314        }
 315        xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
 316
 317        buf = kzalloc(8, GFP_KERNEL);
 318        if (buf) {
 319                snprintf(buf, 8, "%4hx",
 320                                ntohs(addr->sin_port));
 321        }
 322        xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
 323
 324        buf = kzalloc(30, GFP_KERNEL);
 325        if (buf) {
 326                snprintf(buf, 30, NIPQUAD_FMT".%u.%u",
 327                                NIPQUAD(addr->sin_addr.s_addr),
 328                                ntohs(addr->sin_port) >> 8,
 329                                ntohs(addr->sin_port) & 0xff);
 330        }
 331        xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
 332
 333        xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 334}
 335
 336static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt,
 337                                          const char *protocol,
 338                                          const char *netid)
 339{
 340        struct sockaddr_in6 *addr = xs_addr_in6(xprt);
 341        char *buf;
 342
 343        buf = kzalloc(40, GFP_KERNEL);
 344        if (buf) {
 345                snprintf(buf, 40, NIP6_FMT,
 346                                NIP6(addr->sin6_addr));
 347        }
 348        xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
 349
 350        buf = kzalloc(8, GFP_KERNEL);
 351        if (buf) {
 352                snprintf(buf, 8, "%u",
 353                                ntohs(addr->sin6_port));
 354        }
 355        xprt->address_strings[RPC_DISPLAY_PORT] = buf;
 356
 357        xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 358
 359        buf = kzalloc(64, GFP_KERNEL);
 360        if (buf) {
 361                snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
 362                                NIP6(addr->sin6_addr),
 363                                ntohs(addr->sin6_port),
 364                                protocol);
 365        }
 366        xprt->address_strings[RPC_DISPLAY_ALL] = buf;
 367
 368        buf = kzalloc(36, GFP_KERNEL);
 369        if (buf) {
 370                snprintf(buf, 36, NIP6_SEQFMT,
 371                                NIP6(addr->sin6_addr));
 372        }
 373        xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
 374
 375        buf = kzalloc(8, GFP_KERNEL);
 376        if (buf) {
 377                snprintf(buf, 8, "%4hx",
 378                                ntohs(addr->sin6_port));
 379        }
 380        xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
 381
 382        buf = kzalloc(50, GFP_KERNEL);
 383        if (buf) {
 384                snprintf(buf, 50, NIP6_FMT".%u.%u",
 385                                NIP6(addr->sin6_addr),
 386                                ntohs(addr->sin6_port) >> 8,
 387                                ntohs(addr->sin6_port) & 0xff);
 388        }
 389        xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf;
 390
 391        xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 392}
 393
 394static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 395{
 396        unsigned int i;
 397
 398        for (i = 0; i < RPC_DISPLAY_MAX; i++)
 399                switch (i) {
 400                case RPC_DISPLAY_PROTO:
 401                case RPC_DISPLAY_NETID:
 402                        continue;
 403                default:
 404                        kfree(xprt->address_strings[i]);
 405                }
 406}
 407
 408#define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 409
 410static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
 411{
 412        struct msghdr msg = {
 413                .msg_name       = addr,
 414                .msg_namelen    = addrlen,
 415                .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
 416        };
 417        struct kvec iov = {
 418                .iov_base       = vec->iov_base + base,
 419                .iov_len        = vec->iov_len - base,
 420        };
 421
 422        if (iov.iov_len != 0)
 423                return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
 424        return kernel_sendmsg(sock, &msg, NULL, 0, 0);
 425}
 426
 427static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
 428{
 429        struct page **ppage;
 430        unsigned int remainder;
 431        int err, sent = 0;
 432
 433        remainder = xdr->page_len - base;
 434        base += xdr->page_base;
 435        ppage = xdr->pages + (base >> PAGE_SHIFT);
 436        base &= ~PAGE_MASK;
 437        for(;;) {
 438                unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
 439                int flags = XS_SENDMSG_FLAGS;
 440
 441                remainder -= len;
 442                if (remainder != 0 || more)
 443                        flags |= MSG_MORE;
 444                err = sock->ops->sendpage(sock, *ppage, base, len, flags);
 445                if (remainder == 0 || err != len)
 446                        break;
 447                sent += err;
 448                ppage++;
 449                base = 0;
 450        }
 451        if (sent == 0)
 452                return err;
 453        if (err > 0)
 454                sent += err;
 455        return sent;
 456}
 457
 458/**
 459 * xs_sendpages - write pages directly to a socket
 460 * @sock: socket to send on
 461 * @addr: UDP only -- address of destination
 462 * @addrlen: UDP only -- length of destination address
 463 * @xdr: buffer containing this request
 464 * @base: starting position in the buffer
 465 *
 466 */
 467static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
 468{
 469        unsigned int remainder = xdr->len - base;
 470        int err, sent = 0;
 471
 472        if (unlikely(!sock))
 473                return -ENOTCONN;
 474
 475        clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
 476        if (base != 0) {
 477                addr = NULL;
 478                addrlen = 0;
 479        }
 480
 481        if (base < xdr->head[0].iov_len || addr != NULL) {
 482                unsigned int len = xdr->head[0].iov_len - base;
 483                remainder -= len;
 484                err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
 485                if (remainder == 0 || err != len)
 486                        goto out;
 487                sent += err;
 488                base = 0;
 489        } else
 490                base -= xdr->head[0].iov_len;
 491
 492        if (base < xdr->page_len) {
 493                unsigned int len = xdr->page_len - base;
 494                remainder -= len;
 495                err = xs_send_pagedata(sock, xdr, base, remainder != 0);
 496                if (remainder == 0 || err != len)
 497                        goto out;
 498                sent += err;
 499                base = 0;
 500        } else
 501                base -= xdr->page_len;
 502
 503        if (base >= xdr->tail[0].iov_len)
 504                return sent;
 505        err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
 506out:
 507        if (sent == 0)
 508                return err;
 509        if (err > 0)
 510                sent += err;
 511        return sent;
 512}
 513
 514static void xs_nospace_callback(struct rpc_task *task)
 515{
 516        struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
 517
 518        transport->inet->sk_write_pending--;
 519        clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 520}
 521
 522/**
 523 * xs_nospace - place task on wait queue if transmit was incomplete
 524 * @task: task to put to sleep
 525 *
 526 */
 527static void xs_nospace(struct rpc_task *task)
 528{
 529        struct rpc_rqst *req = task->tk_rqstp;
 530        struct rpc_xprt *xprt = req->rq_xprt;
 531        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 532
 533        dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
 534                        task->tk_pid, req->rq_slen - req->rq_bytes_sent,
 535                        req->rq_slen);
 536
 537        /* Protect against races with write_space */
 538        spin_lock_bh(&xprt->transport_lock);
 539
 540        /* Don't race with disconnect */
 541        if (xprt_connected(xprt)) {
 542                if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
 543                        /*
 544                         * Notify TCP that we're limited by the application
 545                         * window size
 546                         */
 547                        set_bit(SOCK_NOSPACE, &transport->sock->flags);
 548                        transport->inet->sk_write_pending++;
 549                        /* ...and wait for more buffer space */
 550                        xprt_wait_for_buffer_space(task, xs_nospace_callback);
 551                }
 552        } else {
 553                clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 554                task->tk_status = -ENOTCONN;
 555        }
 556
 557        spin_unlock_bh(&xprt->transport_lock);
 558}
 559
 560/**
 561 * xs_udp_send_request - write an RPC request to a UDP socket
 562 * @task: address of RPC task that manages the state of an RPC request
 563 *
 564 * Return values:
 565 *        0:    The request has been sent
 566 *   EAGAIN:    The socket was blocked, please call again later to
 567 *              complete the request
 568 * ENOTCONN:    Caller needs to invoke connect logic then call again
 569 *    other:    Some other error occured, the request was not sent
 570 */
 571static int xs_udp_send_request(struct rpc_task *task)
 572{
 573        struct rpc_rqst *req = task->tk_rqstp;
 574        struct rpc_xprt *xprt = req->rq_xprt;
 575        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 576        struct xdr_buf *xdr = &req->rq_snd_buf;
 577        int status;
 578
 579        xs_pktdump("packet data:",
 580                                req->rq_svec->iov_base,
 581                                req->rq_svec->iov_len);
 582
 583        status = xs_sendpages(transport->sock,
 584                              xs_addr(xprt),
 585                              xprt->addrlen, xdr,
 586                              req->rq_bytes_sent);
 587
 588        dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 589                        xdr->len - req->rq_bytes_sent, status);
 590
 591        if (status >= 0) {
 592                task->tk_bytes_sent += status;
 593                if (status >= req->rq_slen)
 594                        return 0;
 595                /* Still some bytes left; set up for a retry later. */
 596                status = -EAGAIN;
 597        }
 598
 599        switch (status) {
 600        case -EAGAIN:
 601                xs_nospace(task);
 602                break;
 603        case -ENETUNREACH:
 604        case -EPIPE:
 605        case -ECONNREFUSED:
 606                /* When the server has died, an ICMP port unreachable message
 607                 * prompts ECONNREFUSED. */
 608                clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 609                break;
 610        default:
 611                clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 612                dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 613                        -status);
 614        }
 615
 616        return status;
 617}
 618
 619/**
 620 * xs_tcp_shutdown - gracefully shut down a TCP socket
 621 * @xprt: transport
 622 *
 623 * Initiates a graceful shutdown of the TCP socket by calling the
 624 * equivalent of shutdown(SHUT_WR);
 625 */
 626static void xs_tcp_shutdown(struct rpc_xprt *xprt)
 627{
 628        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 629        struct socket *sock = transport->sock;
 630
 631        if (sock != NULL)
 632                kernel_sock_shutdown(sock, SHUT_WR);
 633}
 634
 635static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
 636{
 637        u32 reclen = buf->len - sizeof(rpc_fraghdr);
 638        rpc_fraghdr *base = buf->head[0].iov_base;
 639        *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
 640}
 641
 642/**
 643 * xs_tcp_send_request - write an RPC request to a TCP socket
 644 * @task: address of RPC task that manages the state of an RPC request
 645 *
 646 * Return values:
 647 *        0:    The request has been sent
 648 *   EAGAIN:    The socket was blocked, please call again later to
 649 *              complete the request
 650 * ENOTCONN:    Caller needs to invoke connect logic then call again
 651 *    other:    Some other error occured, the request was not sent
 652 *
 653 * XXX: In the case of soft timeouts, should we eventually give up
 654 *      if sendmsg is not able to make progress?
 655 */
 656static int xs_tcp_send_request(struct rpc_task *task)
 657{
 658        struct rpc_rqst *req = task->tk_rqstp;
 659        struct rpc_xprt *xprt = req->rq_xprt;
 660        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 661        struct xdr_buf *xdr = &req->rq_snd_buf;
 662        int status;
 663
 664        xs_encode_tcp_record_marker(&req->rq_snd_buf);
 665
 666        xs_pktdump("packet data:",
 667                                req->rq_svec->iov_base,
 668                                req->rq_svec->iov_len);
 669
 670        /* Continue transmitting the packet/record. We must be careful
 671         * to cope with writespace callbacks arriving _after_ we have
 672         * called sendmsg(). */
 673        while (1) {
 674                status = xs_sendpages(transport->sock,
 675                                        NULL, 0, xdr, req->rq_bytes_sent);
 676
 677                dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
 678                                xdr->len - req->rq_bytes_sent, status);
 679
 680                if (unlikely(status < 0))
 681                        break;
 682
 683                /* If we've sent the entire packet, immediately
 684                 * reset the count of bytes sent. */
 685                req->rq_bytes_sent += status;
 686                task->tk_bytes_sent += status;
 687                if (likely(req->rq_bytes_sent >= req->rq_slen)) {
 688                        req->rq_bytes_sent = 0;
 689                        return 0;
 690                }
 691
 692                if (status != 0)
 693                        continue;
 694                status = -EAGAIN;
 695                break;
 696        }
 697
 698        switch (status) {
 699        case -EAGAIN:
 700                xs_nospace(task);
 701                break;
 702        case -ECONNRESET:
 703                xs_tcp_shutdown(xprt);
 704        case -ECONNREFUSED:
 705        case -ENOTCONN:
 706        case -EPIPE:
 707                status = -ENOTCONN;
 708                clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 709                break;
 710        default:
 711                dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 712                        -status);
 713                clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 714                xs_tcp_shutdown(xprt);
 715        }
 716
 717        return status;
 718}
 719
 720/**
 721 * xs_tcp_release_xprt - clean up after a tcp transmission
 722 * @xprt: transport
 723 * @task: rpc task
 724 *
 725 * This cleans up if an error causes us to abort the transmission of a request.
 726 * In this case, the socket may need to be reset in order to avoid confusing
 727 * the server.
 728 */
 729static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
 730{
 731        struct rpc_rqst *req;
 732
 733        if (task != xprt->snd_task)
 734                return;
 735        if (task == NULL)
 736                goto out_release;
 737        req = task->tk_rqstp;
 738        if (req->rq_bytes_sent == 0)
 739                goto out_release;
 740        if (req->rq_bytes_sent == req->rq_snd_buf.len)
 741                goto out_release;
 742        set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
 743out_release:
 744        xprt_release_xprt(xprt, task);
 745}
 746
 747static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
 748{
 749        transport->old_data_ready = sk->sk_data_ready;
 750        transport->old_state_change = sk->sk_state_change;
 751        transport->old_write_space = sk->sk_write_space;
 752        transport->old_error_report = sk->sk_error_report;
 753}
 754
 755static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
 756{
 757        sk->sk_data_ready = transport->old_data_ready;
 758        sk->sk_state_change = transport->old_state_change;
 759        sk->sk_write_space = transport->old_write_space;
 760        sk->sk_error_report = transport->old_error_report;
 761}
 762
 763/**
 764 * xs_close - close a socket
 765 * @xprt: transport
 766 *
 767 * This is used when all requests are complete; ie, no DRC state remains
 768 * on the server we want to save.
 769 */
 770static void xs_close(struct rpc_xprt *xprt)
 771{
 772        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 773        struct socket *sock = transport->sock;
 774        struct sock *sk = transport->inet;
 775
 776        if (!sk)
 777                goto clear_close_wait;
 778
 779        dprintk("RPC:       xs_close xprt %p\n", xprt);
 780
 781        write_lock_bh(&sk->sk_callback_lock);
 782        transport->inet = NULL;
 783        transport->sock = NULL;
 784
 785        sk->sk_user_data = NULL;
 786
 787        xs_restore_old_callbacks(transport, sk);
 788        write_unlock_bh(&sk->sk_callback_lock);
 789
 790        sk->sk_no_check = 0;
 791
 792        sock_release(sock);
 793clear_close_wait:
 794        smp_mb__before_clear_bit();
 795        clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
 796        clear_bit(XPRT_CLOSING, &xprt->state);
 797        smp_mb__after_clear_bit();
 798        xprt_disconnect_done(xprt);
 799}
 800
 801/**
 802 * xs_destroy - prepare to shutdown a transport
 803 * @xprt: doomed transport
 804 *
 805 */
 806static void xs_destroy(struct rpc_xprt *xprt)
 807{
 808        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 809
 810        dprintk("RPC:       xs_destroy xprt %p\n", xprt);
 811
 812        cancel_rearming_delayed_work(&transport->connect_worker);
 813
 814        xs_close(xprt);
 815        xs_free_peer_addresses(xprt);
 816        kfree(xprt->slot);
 817        kfree(xprt);
 818        module_put(THIS_MODULE);
 819}
 820
 821static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 822{
 823        return (struct rpc_xprt *) sk->sk_user_data;
 824}
 825
 826/**
 827 * xs_udp_data_ready - "data ready" callback for UDP sockets
 828 * @sk: socket with data to read
 829 * @len: how much data to read
 830 *
 831 */
 832static void xs_udp_data_ready(struct sock *sk, int len)
 833{
 834        struct rpc_task *task;
 835        struct rpc_xprt *xprt;
 836        struct rpc_rqst *rovr;
 837        struct sk_buff *skb;
 838        int err, repsize, copied;
 839        u32 _xid;
 840        __be32 *xp;
 841
 842        read_lock(&sk->sk_callback_lock);
 843        dprintk("RPC:       xs_udp_data_ready...\n");
 844        if (!(xprt = xprt_from_sock(sk)))
 845                goto out;
 846
 847        if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
 848                goto out;
 849
 850        if (xprt->shutdown)
 851                goto dropit;
 852
 853        repsize = skb->len - sizeof(struct udphdr);
 854        if (repsize < 4) {
 855                dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
 856                goto dropit;
 857        }
 858
 859        /* Copy the XID from the skb... */
 860        xp = skb_header_pointer(skb, sizeof(struct udphdr),
 861                                sizeof(_xid), &_xid);
 862        if (xp == NULL)
 863                goto dropit;
 864
 865        /* Look up and lock the request corresponding to the given XID */
 866        spin_lock(&xprt->transport_lock);
 867        rovr = xprt_lookup_rqst(xprt, *xp);
 868        if (!rovr)
 869                goto out_unlock;
 870        task = rovr->rq_task;
 871
 872        if ((copied = rovr->rq_private_buf.buflen) > repsize)
 873                copied = repsize;
 874
 875        /* Suck it into the iovec, verify checksum if not done by hw. */
 876        if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
 877                UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
 878                goto out_unlock;
 879        }
 880
 881        UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
 882
 883        /* Something worked... */
 884        dst_confirm(skb->dst);
 885
 886        xprt_adjust_cwnd(task, copied);
 887        xprt_update_rtt(task);
 888        xprt_complete_rqst(task, copied);
 889
 890 out_unlock:
 891        spin_unlock(&xprt->transport_lock);
 892 dropit:
 893        skb_free_datagram(sk, skb);
 894 out:
 895        read_unlock(&sk->sk_callback_lock);
 896}
 897
 898static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
 899{
 900        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 901        size_t len, used;
 902        char *p;
 903
 904        p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
 905        len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
 906        used = xdr_skb_read_bits(desc, p, len);
 907        transport->tcp_offset += used;
 908        if (used != len)
 909                return;
 910
 911        transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
 912        if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
 913                transport->tcp_flags |= TCP_RCV_LAST_FRAG;
 914        else
 915                transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
 916        transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
 917
 918        transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
 919        transport->tcp_offset = 0;
 920
 921        /* Sanity check of the record length */
 922        if (unlikely(transport->tcp_reclen < 4)) {
 923                dprintk("RPC:       invalid TCP record fragment length\n");
 924                xprt_force_disconnect(xprt);
 925                return;
 926        }
 927        dprintk("RPC:       reading TCP record fragment of length %d\n",
 928                        transport->tcp_reclen);
 929}
 930
 931static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
 932{
 933        if (transport->tcp_offset == transport->tcp_reclen) {
 934                transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
 935                transport->tcp_offset = 0;
 936                if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
 937                        transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 938                        transport->tcp_flags |= TCP_RCV_COPY_XID;
 939                        transport->tcp_copied = 0;
 940                }
 941        }
 942}
 943
 944static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
 945{
 946        size_t len, used;
 947        char *p;
 948
 949        len = sizeof(transport->tcp_xid) - transport->tcp_offset;
 950        dprintk("RPC:       reading XID (%Zu bytes)\n", len);
 951        p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
 952        used = xdr_skb_read_bits(desc, p, len);
 953        transport->tcp_offset += used;
 954        if (used != len)
 955                return;
 956        transport->tcp_flags &= ~TCP_RCV_COPY_XID;
 957        transport->tcp_flags |= TCP_RCV_COPY_DATA;
 958        transport->tcp_copied = 4;
 959        dprintk("RPC:       reading reply for XID %08x\n",
 960                        ntohl(transport->tcp_xid));
 961        xs_tcp_check_fraghdr(transport);
 962}
 963
 964static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
 965{
 966        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 967        struct rpc_rqst *req;
 968        struct xdr_buf *rcvbuf;
 969        size_t len;
 970        ssize_t r;
 971
 972        /* Find and lock the request corresponding to this xid */
 973        spin_lock(&xprt->transport_lock);
 974        req = xprt_lookup_rqst(xprt, transport->tcp_xid);
 975        if (!req) {
 976                transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 977                dprintk("RPC:       XID %08x request not found!\n",
 978                                ntohl(transport->tcp_xid));
 979                spin_unlock(&xprt->transport_lock);
 980                return;
 981        }
 982
 983        rcvbuf = &req->rq_private_buf;
 984        len = desc->count;
 985        if (len > transport->tcp_reclen - transport->tcp_offset) {
 986                struct xdr_skb_reader my_desc;
 987
 988                len = transport->tcp_reclen - transport->tcp_offset;
 989                memcpy(&my_desc, desc, sizeof(my_desc));
 990                my_desc.count = len;
 991                r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
 992                                          &my_desc, xdr_skb_read_bits);
 993                desc->count -= r;
 994                desc->offset += r;
 995        } else
 996                r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
 997                                          desc, xdr_skb_read_bits);
 998
 999        if (r > 0) {
1000                transport->tcp_copied += r;
1001                transport->tcp_offset += r;
1002        }
1003        if (r != len) {
1004                /* Error when copying to the receive buffer,
1005                 * usually because we weren't able to allocate
1006                 * additional buffer pages. All we can do now
1007                 * is turn off TCP_RCV_COPY_DATA, so the request
1008                 * will not receive any additional updates,
1009                 * and time out.
1010                 * Any remaining data from this record will
1011                 * be discarded.
1012                 */
1013                transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1014                dprintk("RPC:       XID %08x truncated request\n",
1015                                ntohl(transport->tcp_xid));
1016                dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
1017                                "tcp_offset = %u, tcp_reclen = %u\n",
1018                                xprt, transport->tcp_copied,
1019                                transport->tcp_offset, transport->tcp_reclen);
1020                goto out;
1021        }
1022
1023        dprintk("RPC:       XID %08x read %Zd bytes\n",
1024                        ntohl(transport->tcp_xid), r);
1025        dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1026                        "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1027                        transport->tcp_offset, transport->tcp_reclen);
1028
1029        if (transport->tcp_copied == req->rq_private_buf.buflen)
1030                transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1031        else if (transport->tcp_offset == transport->tcp_reclen) {
1032                if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1033                        transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1034        }
1035
1036out:
1037        if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1038                xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1039        spin_unlock(&xprt->transport_lock);
1040        xs_tcp_check_fraghdr(transport);
1041}
1042
1043static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1044{
1045        size_t len;
1046
1047        len = transport->tcp_reclen - transport->tcp_offset;
1048        if (len > desc->count)
1049                len = desc->count;
1050        desc->count -= len;
1051        desc->offset += len;
1052        transport->tcp_offset += len;
1053        dprintk("RPC:       discarded %Zu bytes\n", len);
1054        xs_tcp_check_fraghdr(transport);
1055}
1056
1057static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1058{
1059        struct rpc_xprt *xprt = rd_desc->arg.data;
1060        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1061        struct xdr_skb_reader desc = {
1062                .skb    = skb,
1063                .offset = offset,
1064                .count  = len,
1065        };
1066
1067        dprintk("RPC:       xs_tcp_data_recv started\n");
1068        do {
1069                /* Read in a new fragment marker if necessary */
1070                /* Can we ever really expect to get completely empty fragments? */
1071                if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1072                        xs_tcp_read_fraghdr(xprt, &desc);
1073                        continue;
1074                }
1075                /* Read in the xid if necessary */
1076                if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1077                        xs_tcp_read_xid(transport, &desc);
1078                        continue;
1079                }
1080                /* Read in the request data */
1081                if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1082                        xs_tcp_read_request(xprt, &desc);
1083                        continue;
1084                }
1085                /* Skip over any trailing bytes on short reads */
1086                xs_tcp_read_discard(transport, &desc);
1087        } while (desc.count);
1088        dprintk("RPC:       xs_tcp_data_recv done\n");
1089        return len - desc.count;
1090}
1091
1092/**
1093 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1094 * @sk: socket with data to read
1095 * @bytes: how much data to read
1096 *
1097 */
1098static void xs_tcp_data_ready(struct sock *sk, int bytes)
1099{
1100        struct rpc_xprt *xprt;
1101        read_descriptor_t rd_desc;
1102        int read;
1103
1104        dprintk("RPC:       xs_tcp_data_ready...\n");
1105
1106        read_lock(&sk->sk_callback_lock);
1107        if (!(xprt = xprt_from_sock(sk)))
1108                goto out;
1109        if (xprt->shutdown)
1110                goto out;
1111
1112        /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1113        rd_desc.arg.data = xprt;
1114        do {
1115                rd_desc.count = 65536;
1116                read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1117        } while (read > 0);
1118out:
1119        read_unlock(&sk->sk_callback_lock);
1120}
1121
1122/**
1123 * xs_tcp_state_change - callback to handle TCP socket state changes
1124 * @sk: socket whose state has changed
1125 *
1126 */
1127static void xs_tcp_state_change(struct sock *sk)
1128{
1129        struct rpc_xprt *xprt;
1130
1131        read_lock(&sk->sk_callback_lock);
1132        if (!(xprt = xprt_from_sock(sk)))
1133                goto out;
1134        dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1135        dprintk("RPC:       state %x conn %d dead %d zapped %d\n",
1136                        sk->sk_state, xprt_connected(xprt),
1137                        sock_flag(sk, SOCK_DEAD),
1138                        sock_flag(sk, SOCK_ZAPPED));
1139
1140        switch (sk->sk_state) {
1141        case TCP_ESTABLISHED:
1142                spin_lock_bh(&xprt->transport_lock);
1143                if (!xprt_test_and_set_connected(xprt)) {
1144                        struct sock_xprt *transport = container_of(xprt,
1145                                        struct sock_xprt, xprt);
1146
1147                        /* Reset TCP record info */
1148                        transport->tcp_offset = 0;
1149                        transport->tcp_reclen = 0;
1150                        transport->tcp_copied = 0;
1151                        transport->tcp_flags =
1152                                TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1153
1154                        xprt_wake_pending_tasks(xprt, 0);
1155                }
1156                spin_unlock_bh(&xprt->transport_lock);
1157                break;
1158        case TCP_FIN_WAIT1:
1159                /* The client initiated a shutdown of the socket */
1160                xprt->connect_cookie++;
1161                xprt->reestablish_timeout = 0;
1162                set_bit(XPRT_CLOSING, &xprt->state);
1163                smp_mb__before_clear_bit();
1164                clear_bit(XPRT_CONNECTED, &xprt->state);
1165                clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1166                smp_mb__after_clear_bit();
1167                break;
1168        case TCP_CLOSE_WAIT:
1169                /* The server initiated a shutdown of the socket */
1170                set_bit(XPRT_CLOSING, &xprt->state);
1171                xprt_force_disconnect(xprt);
1172        case TCP_SYN_SENT:
1173                xprt->connect_cookie++;
1174        case TCP_CLOSING:
1175                /*
1176                 * If the server closed down the connection, make sure that
1177                 * we back off before reconnecting
1178                 */
1179                if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1180                        xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1181                break;
1182        case TCP_LAST_ACK:
1183                smp_mb__before_clear_bit();
1184                clear_bit(XPRT_CONNECTED, &xprt->state);
1185                smp_mb__after_clear_bit();
1186                break;
1187        case TCP_CLOSE:
1188                smp_mb__before_clear_bit();
1189                clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1190                clear_bit(XPRT_CLOSING, &xprt->state);
1191                smp_mb__after_clear_bit();
1192                /* Mark transport as closed and wake up all pending tasks */
1193                xprt_disconnect_done(xprt);
1194        }
1195 out:
1196        read_unlock(&sk->sk_callback_lock);
1197}
1198
1199/**
1200 * xs_tcp_error_report - callback mainly for catching RST events
1201 * @sk: socket
1202 */
1203static void xs_tcp_error_report(struct sock *sk)
1204{
1205        struct rpc_xprt *xprt;
1206
1207        read_lock(&sk->sk_callback_lock);
1208        if (sk->sk_err != ECONNRESET || sk->sk_state != TCP_ESTABLISHED)
1209                goto out;
1210        if (!(xprt = xprt_from_sock(sk)))
1211                goto out;
1212        dprintk("RPC:       %s client %p...\n"
1213                        "RPC:       error %d\n",
1214                        __func__, xprt, sk->sk_err);
1215
1216        xprt_force_disconnect(xprt);
1217out:
1218        read_unlock(&sk->sk_callback_lock);
1219}
1220
1221/**
1222 * xs_udp_write_space - callback invoked when socket buffer space
1223 *                             becomes available
1224 * @sk: socket whose state has changed
1225 *
1226 * Called when more output buffer space is available for this socket.
1227 * We try not to wake our writers until they can make "significant"
1228 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1229 * with a bunch of small requests.
1230 */
1231static void xs_udp_write_space(struct sock *sk)
1232{
1233        read_lock(&sk->sk_callback_lock);
1234
1235        /* from net/core/sock.c:sock_def_write_space */
1236        if (sock_writeable(sk)) {
1237                struct socket *sock;
1238                struct rpc_xprt *xprt;
1239
1240                if (unlikely(!(sock = sk->sk_socket)))
1241                        goto out;
1242                clear_bit(SOCK_NOSPACE, &sock->flags);
1243
1244                if (unlikely(!(xprt = xprt_from_sock(sk))))
1245                        goto out;
1246                if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1247                        goto out;
1248
1249                xprt_write_space(xprt);
1250        }
1251
1252 out:
1253        read_unlock(&sk->sk_callback_lock);
1254}
1255
1256/**
1257 * xs_tcp_write_space - callback invoked when socket buffer space
1258 *                             becomes available
1259 * @sk: socket whose state has changed
1260 *
1261 * Called when more output buffer space is available for this socket.
1262 * We try not to wake our writers until they can make "significant"
1263 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1264 * with a bunch of small requests.
1265 */
1266static void xs_tcp_write_space(struct sock *sk)
1267{
1268        read_lock(&sk->sk_callback_lock);
1269
1270        /* from net/core/stream.c:sk_stream_write_space */
1271        if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1272                struct socket *sock;
1273                struct rpc_xprt *xprt;
1274
1275                if (unlikely(!(sock = sk->sk_socket)))
1276                        goto out;
1277                clear_bit(SOCK_NOSPACE, &sock->flags);
1278
1279                if (unlikely(!(xprt = xprt_from_sock(sk))))
1280                        goto out;
1281                if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1282                        goto out;
1283
1284                xprt_write_space(xprt);
1285        }
1286
1287 out:
1288        read_unlock(&sk->sk_callback_lock);
1289}
1290
1291static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1292{
1293        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1294        struct sock *sk = transport->inet;
1295
1296        if (transport->rcvsize) {
1297                sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1298                sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1299        }
1300        if (transport->sndsize) {
1301                sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1302                sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1303                sk->sk_write_space(sk);
1304        }
1305}
1306
1307/**
1308 * xs_udp_set_buffer_size - set send and receive limits
1309 * @xprt: generic transport
1310 * @sndsize: requested size of send buffer, in bytes
1311 * @rcvsize: requested size of receive buffer, in bytes
1312 *
1313 * Set socket send and receive buffer size limits.
1314 */
1315static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1316{
1317        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1318
1319        transport->sndsize = 0;
1320        if (sndsize)
1321                transport->sndsize = sndsize + 1024;
1322        transport->rcvsize = 0;
1323        if (rcvsize)
1324                transport->rcvsize = rcvsize + 1024;
1325
1326        xs_udp_do_set_buffer_size(xprt);
1327}
1328
1329/**
1330 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1331 * @task: task that timed out
1332 *
1333 * Adjust the congestion window after a retransmit timeout has occurred.
1334 */
1335static void xs_udp_timer(struct rpc_task *task)
1336{
1337        xprt_adjust_cwnd(task, -ETIMEDOUT);
1338}
1339
1340static unsigned short xs_get_random_port(void)
1341{
1342        unsigned short range = xprt_max_resvport - xprt_min_resvport;
1343        unsigned short rand = (unsigned short) net_random() % range;
1344        return rand + xprt_min_resvport;
1345}
1346
1347/**
1348 * xs_set_port - reset the port number in the remote endpoint address
1349 * @xprt: generic transport
1350 * @port: new port number
1351 *
1352 */
1353static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1354{
1355        struct sockaddr *addr = xs_addr(xprt);
1356
1357        dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1358
1359        switch (addr->sa_family) {
1360        case AF_INET:
1361                ((struct sockaddr_in *)addr)->sin_port = htons(port);
1362                break;
1363        case AF_INET6:
1364                ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1365                break;
1366        default:
1367                BUG();
1368        }
1369}
1370
1371static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1372{
1373        unsigned short port = transport->port;
1374
1375        if (port == 0 && transport->xprt.resvport)
1376                port = xs_get_random_port();
1377        return port;
1378}
1379
1380static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1381{
1382        if (transport->port != 0)
1383                transport->port = 0;
1384        if (!transport->xprt.resvport)
1385                return 0;
1386        if (port <= xprt_min_resvport || port > xprt_max_resvport)
1387                return xprt_max_resvport;
1388        return --port;
1389}
1390
1391static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1392{
1393        struct sockaddr_in myaddr = {
1394                .sin_family = AF_INET,
1395        };
1396        struct sockaddr_in *sa;
1397        int err, nloop = 0;
1398        unsigned short port = xs_get_srcport(transport, sock);
1399        unsigned short last;
1400
1401        sa = (struct sockaddr_in *)&transport->addr;
1402        myaddr.sin_addr = sa->sin_addr;
1403        do {
1404                myaddr.sin_port = htons(port);
1405                err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1406                                                sizeof(myaddr));
1407                if (port == 0)
1408                        break;
1409                if (err == 0) {
1410                        transport->port = port;
1411                        break;
1412                }
1413                last = port;
1414                port = xs_next_srcport(transport, sock, port);
1415                if (port > last)
1416                        nloop++;
1417        } while (err == -EADDRINUSE && nloop != 2);
1418        dprintk("RPC:       %s "NIPQUAD_FMT":%u: %s (%d)\n",
1419                        __func__, NIPQUAD(myaddr.sin_addr),
1420                        port, err ? "failed" : "ok", err);
1421        return err;
1422}
1423
1424static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1425{
1426        struct sockaddr_in6 myaddr = {
1427                .sin6_family = AF_INET6,
1428        };
1429        struct sockaddr_in6 *sa;
1430        int err, nloop = 0;
1431        unsigned short port = xs_get_srcport(transport, sock);
1432        unsigned short last;
1433
1434        sa = (struct sockaddr_in6 *)&transport->addr;
1435        myaddr.sin6_addr = sa->sin6_addr;
1436        do {
1437                myaddr.sin6_port = htons(port);
1438                err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1439                                                sizeof(myaddr));
1440                if (port == 0)
1441                        break;
1442                if (err == 0) {
1443                        transport->port = port;
1444                        break;
1445                }
1446                last = port;
1447                port = xs_next_srcport(transport, sock, port);
1448                if (port > last)
1449                        nloop++;
1450        } while (err == -EADDRINUSE && nloop != 2);
1451        dprintk("RPC:       xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1452                NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1453        return err;
1454}
1455
1456#ifdef CONFIG_DEBUG_LOCK_ALLOC
1457static struct lock_class_key xs_key[2];
1458static struct lock_class_key xs_slock_key[2];
1459
1460static inline void xs_reclassify_socket4(struct socket *sock)
1461{
1462        struct sock *sk = sock->sk;
1463
1464        BUG_ON(sock_owned_by_user(sk));
1465        sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1466                &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1467}
1468
1469static inline void xs_reclassify_socket6(struct socket *sock)
1470{
1471        struct sock *sk = sock->sk;
1472
1473        BUG_ON(sock_owned_by_user(sk));
1474        sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1475                &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1476}
1477#else
1478static inline void xs_reclassify_socket4(struct socket *sock)
1479{
1480}
1481
1482static inline void xs_reclassify_socket6(struct socket *sock)
1483{
1484}
1485#endif
1486
1487static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1488{
1489        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1490
1491        if (!transport->inet) {
1492                struct sock *sk = sock->sk;
1493
1494                write_lock_bh(&sk->sk_callback_lock);
1495
1496                xs_save_old_callbacks(transport, sk);
1497
1498                sk->sk_user_data = xprt;
1499                sk->sk_data_ready = xs_udp_data_ready;
1500                sk->sk_write_space = xs_udp_write_space;
1501                sk->sk_no_check = UDP_CSUM_NORCV;
1502                sk->sk_allocation = GFP_ATOMIC;
1503
1504                xprt_set_connected(xprt);
1505
1506                /* Reset to new socket */
1507                transport->sock = sock;
1508                transport->inet = sk;
1509
1510                write_unlock_bh(&sk->sk_callback_lock);
1511        }
1512        xs_udp_do_set_buffer_size(xprt);
1513}
1514
1515/**
1516 * xs_udp_connect_worker4 - set up a UDP socket
1517 * @work: RPC transport to connect
1518 *
1519 * Invoked by a work queue tasklet.
1520 */
1521static void xs_udp_connect_worker4(struct work_struct *work)
1522{
1523        struct sock_xprt *transport =
1524                container_of(work, struct sock_xprt, connect_worker.work);
1525        struct rpc_xprt *xprt = &transport->xprt;
1526        struct socket *sock = transport->sock;
1527        int err, status = -EIO;
1528
1529        if (xprt->shutdown || !xprt_bound(xprt))
1530                goto out;
1531
1532        /* Start by resetting any existing state */
1533        xs_close(xprt);
1534
1535        if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1536                dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1537                goto out;
1538        }
1539        xs_reclassify_socket4(sock);
1540
1541        if (xs_bind4(transport, sock)) {
1542                sock_release(sock);
1543                goto out;
1544        }
1545
1546        dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1547                        xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1548
1549        xs_udp_finish_connecting(xprt, sock);
1550        status = 0;
1551out:
1552        xprt_wake_pending_tasks(xprt, status);
1553        xprt_clear_connecting(xprt);
1554}
1555
1556/**
1557 * xs_udp_connect_worker6 - set up a UDP socket
1558 * @work: RPC transport to connect
1559 *
1560 * Invoked by a work queue tasklet.
1561 */
1562static void xs_udp_connect_worker6(struct work_struct *work)
1563{
1564        struct sock_xprt *transport =
1565                container_of(work, struct sock_xprt, connect_worker.work);
1566        struct rpc_xprt *xprt = &transport->xprt;
1567        struct socket *sock = transport->sock;
1568        int err, status = -EIO;
1569
1570        if (xprt->shutdown || !xprt_bound(xprt))
1571                goto out;
1572
1573        /* Start by resetting any existing state */
1574        xs_close(xprt);
1575
1576        if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1577                dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1578                goto out;
1579        }
1580        xs_reclassify_socket6(sock);
1581
1582        if (xs_bind6(transport, sock) < 0) {
1583                sock_release(sock);
1584                goto out;
1585        }
1586
1587        dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1588                        xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1589
1590        xs_udp_finish_connecting(xprt, sock);
1591        status = 0;
1592out:
1593        xprt_wake_pending_tasks(xprt, status);
1594        xprt_clear_connecting(xprt);
1595}
1596
1597/*
1598 * We need to preserve the port number so the reply cache on the server can
1599 * find our cached RPC replies when we get around to reconnecting.
1600 */
1601static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1602{
1603        int result;
1604        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1605        struct sockaddr any;
1606
1607        dprintk("RPC:       disconnecting xprt %p to reuse port\n", xprt);
1608
1609        /*
1610         * Disconnect the transport socket by doing a connect operation
1611         * with AF_UNSPEC.  This should return immediately...
1612         */
1613        memset(&any, 0, sizeof(any));
1614        any.sa_family = AF_UNSPEC;
1615        result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1616        if (result)
1617                dprintk("RPC:       AF_UNSPEC connect return code %d\n",
1618                                result);
1619}
1620
1621static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1622{
1623        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1624
1625        if (!transport->inet) {
1626                struct sock *sk = sock->sk;
1627
1628                write_lock_bh(&sk->sk_callback_lock);
1629
1630                xs_save_old_callbacks(transport, sk);
1631
1632                sk->sk_user_data = xprt;
1633                sk->sk_data_ready = xs_tcp_data_ready;
1634                sk->sk_state_change = xs_tcp_state_change;
1635                sk->sk_write_space = xs_tcp_write_space;
1636                sk->sk_error_report = xs_tcp_error_report;
1637                sk->sk_allocation = GFP_ATOMIC;
1638
1639                /* socket options */
1640                sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1641                sock_reset_flag(sk, SOCK_LINGER);
1642                tcp_sk(sk)->linger2 = 0;
1643                tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1644
1645                xprt_clear_connected(xprt);
1646
1647                /* Reset to new socket */
1648                transport->sock = sock;
1649                transport->inet = sk;
1650
1651                write_unlock_bh(&sk->sk_callback_lock);
1652        }
1653
1654        /* Tell the socket layer to start connecting... */
1655        xprt->stat.connect_count++;
1656        xprt->stat.connect_start = jiffies;
1657        return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1658}
1659
1660/**
1661 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1662 * @work: RPC transport to connect
1663 *
1664 * Invoked by a work queue tasklet.
1665 */
1666static void xs_tcp_connect_worker4(struct work_struct *work)
1667{
1668        struct sock_xprt *transport =
1669                container_of(work, struct sock_xprt, connect_worker.work);
1670        struct rpc_xprt *xprt = &transport->xprt;
1671        struct socket *sock = transport->sock;
1672        int err, status = -EIO;
1673
1674        if (xprt->shutdown || !xprt_bound(xprt))
1675                goto out;
1676
1677        if (!sock) {
1678                /* start from scratch */
1679                if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1680                        dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1681                        goto out;
1682                }
1683                xs_reclassify_socket4(sock);
1684
1685                if (xs_bind4(transport, sock) < 0) {
1686                        sock_release(sock);
1687                        goto out;
1688                }
1689        } else
1690                /* "close" the socket, preserving the local port */
1691                xs_tcp_reuse_connection(xprt);
1692
1693        dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1694                        xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1695
1696        status = xs_tcp_finish_connecting(xprt, sock);
1697        dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1698                        xprt, -status, xprt_connected(xprt),
1699                        sock->sk->sk_state);
1700        if (status < 0) {
1701                switch (status) {
1702                        case -EINPROGRESS:
1703                        case -EALREADY:
1704                                goto out_clear;
1705                        case -ECONNREFUSED:
1706                        case -ECONNRESET:
1707                                /* retry with existing socket, after a delay */
1708                                break;
1709                        default:
1710                                /* get rid of existing socket, and retry */
1711                                xs_tcp_shutdown(xprt);
1712                }
1713        }
1714out:
1715        xprt_wake_pending_tasks(xprt, status);
1716out_clear:
1717        xprt_clear_connecting(xprt);
1718}
1719
1720/**
1721 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1722 * @work: RPC transport to connect
1723 *
1724 * Invoked by a work queue tasklet.
1725 */
1726static void xs_tcp_connect_worker6(struct work_struct *work)
1727{
1728        struct sock_xprt *transport =
1729                container_of(work, struct sock_xprt, connect_worker.work);
1730        struct rpc_xprt *xprt = &transport->xprt;
1731        struct socket *sock = transport->sock;
1732        int err, status = -EIO;
1733
1734        if (xprt->shutdown || !xprt_bound(xprt))
1735                goto out;
1736
1737        if (!sock) {
1738                /* start from scratch */
1739                if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1740                        dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1741                        goto out;
1742                }
1743                xs_reclassify_socket6(sock);
1744
1745                if (xs_bind6(transport, sock) < 0) {
1746                        sock_release(sock);
1747                        goto out;
1748                }
1749        } else
1750                /* "close" the socket, preserving the local port */
1751                xs_tcp_reuse_connection(xprt);
1752
1753        dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1754                        xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1755
1756        status = xs_tcp_finish_connecting(xprt, sock);
1757        dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1758                        xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1759        if (status < 0) {
1760                switch (status) {
1761                        case -EINPROGRESS:
1762                        case -EALREADY:
1763                                goto out_clear;
1764                        case -ECONNREFUSED:
1765                        case -ECONNRESET:
1766                                /* retry with existing socket, after a delay */
1767                                break;
1768                        default:
1769                                /* get rid of existing socket, and retry */
1770                                xs_tcp_shutdown(xprt);
1771                }
1772        }
1773out:
1774        xprt_wake_pending_tasks(xprt, status);
1775out_clear:
1776        xprt_clear_connecting(xprt);
1777}
1778
1779/**
1780 * xs_connect - connect a socket to a remote endpoint
1781 * @task: address of RPC task that manages state of connect request
1782 *
1783 * TCP: If the remote end dropped the connection, delay reconnecting.
1784 *
1785 * UDP socket connects are synchronous, but we use a work queue anyway
1786 * to guarantee that even unprivileged user processes can set up a
1787 * socket on a privileged port.
1788 *
1789 * If a UDP socket connect fails, the delay behavior here prevents
1790 * retry floods (hard mounts).
1791 */
1792static void xs_connect(struct rpc_task *task)
1793{
1794        struct rpc_xprt *xprt = task->tk_xprt;
1795        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1796
1797        if (xprt_test_and_set_connecting(xprt))
1798                return;
1799
1800        if (transport->sock != NULL) {
1801                dprintk("RPC:       xs_connect delayed xprt %p for %lu "
1802                                "seconds\n",
1803                                xprt, xprt->reestablish_timeout / HZ);
1804                queue_delayed_work(rpciod_workqueue,
1805                                   &transport->connect_worker,
1806                                   xprt->reestablish_timeout);
1807                xprt->reestablish_timeout <<= 1;
1808                if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1809                        xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1810        } else {
1811                dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
1812                queue_delayed_work(rpciod_workqueue,
1813                                   &transport->connect_worker, 0);
1814        }
1815}
1816
1817static void xs_tcp_connect(struct rpc_task *task)
1818{
1819        struct rpc_xprt *xprt = task->tk_xprt;
1820
1821        /* Initiate graceful shutdown of the socket if not already done */
1822        if (test_bit(XPRT_CONNECTED, &xprt->state))
1823                xs_tcp_shutdown(xprt);
1824        /* Exit if we need to wait for socket shutdown to complete */
1825        if (test_bit(XPRT_CLOSING, &xprt->state))
1826                return;
1827        xs_connect(task);
1828}
1829
1830/**
1831 * xs_udp_print_stats - display UDP socket-specifc stats
1832 * @xprt: rpc_xprt struct containing statistics
1833 * @seq: output file
1834 *
1835 */
1836static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1837{
1838        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1839
1840        seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1841                        transport->port,
1842                        xprt->stat.bind_count,
1843                        xprt->stat.sends,
1844                        xprt->stat.recvs,
1845                        xprt->stat.bad_xids,
1846                        xprt->stat.req_u,
1847                        xprt->stat.bklog_u);
1848}
1849
1850/**
1851 * xs_tcp_print_stats - display TCP socket-specifc stats
1852 * @xprt: rpc_xprt struct containing statistics
1853 * @seq: output file
1854 *
1855 */
1856static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1857{
1858        struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1859        long idle_time = 0;
1860
1861        if (xprt_connected(xprt))
1862                idle_time = (long)(jiffies - xprt->last_used) / HZ;
1863
1864        seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1865                        transport->port,
1866                        xprt->stat.bind_count,
1867                        xprt->stat.connect_count,
1868                        xprt->stat.connect_time,
1869                        idle_time,
1870                        xprt->stat.sends,
1871                        xprt->stat.recvs,
1872                        xprt->stat.bad_xids,
1873                        xprt->stat.req_u,
1874                        xprt->stat.bklog_u);
1875}
1876
1877static struct rpc_xprt_ops xs_udp_ops = {
1878        .set_buffer_size        = xs_udp_set_buffer_size,
1879        .reserve_xprt           = xprt_reserve_xprt_cong,
1880        .release_xprt           = xprt_release_xprt_cong,
1881        .rpcbind                = rpcb_getport_async,
1882        .set_port               = xs_set_port,
1883        .connect                = xs_connect,
1884        .buf_alloc              = rpc_malloc,
1885        .buf_free               = rpc_free,
1886        .send_request           = xs_udp_send_request,
1887        .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
1888        .timer                  = xs_udp_timer,
1889        .release_request        = xprt_release_rqst_cong,
1890        .close                  = xs_close,
1891        .destroy                = xs_destroy,
1892        .print_stats            = xs_udp_print_stats,
1893};
1894
1895static struct rpc_xprt_ops xs_tcp_ops = {
1896        .reserve_xprt           = xprt_reserve_xprt,
1897        .release_xprt           = xs_tcp_release_xprt,
1898        .rpcbind                = rpcb_getport_async,
1899        .set_port               = xs_set_port,
1900        .connect                = xs_tcp_connect,
1901        .buf_alloc              = rpc_malloc,
1902        .buf_free               = rpc_free,
1903        .send_request           = xs_tcp_send_request,
1904        .set_retrans_timeout    = xprt_set_retrans_timeout_def,
1905        .close                  = xs_tcp_shutdown,
1906        .destroy                = xs_destroy,
1907        .print_stats            = xs_tcp_print_stats,
1908};
1909
1910static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
1911                                      unsigned int slot_table_size)
1912{
1913        struct rpc_xprt *xprt;
1914        struct sock_xprt *new;
1915
1916        if (args->addrlen > sizeof(xprt->addr)) {
1917                dprintk("RPC:       xs_setup_xprt: address too large\n");
1918                return ERR_PTR(-EBADF);
1919        }
1920
1921        new = kzalloc(sizeof(*new), GFP_KERNEL);
1922        if (new == NULL) {
1923                dprintk("RPC:       xs_setup_xprt: couldn't allocate "
1924                                "rpc_xprt\n");
1925                return ERR_PTR(-ENOMEM);
1926        }
1927        xprt = &new->xprt;
1928
1929        xprt->max_reqs = slot_table_size;
1930        xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1931        if (xprt->slot == NULL) {
1932                kfree(xprt);
1933                dprintk("RPC:       xs_setup_xprt: couldn't allocate slot "
1934                                "table\n");
1935                return ERR_PTR(-ENOMEM);
1936        }
1937
1938        memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1939        xprt->addrlen = args->addrlen;
1940        if (args->srcaddr)
1941                memcpy(&new->addr, args->srcaddr, args->addrlen);
1942
1943        return xprt;
1944}
1945
1946static const struct rpc_timeout xs_udp_default_timeout = {
1947        .to_initval = 5 * HZ,
1948        .to_maxval = 30 * HZ,
1949        .to_increment = 5 * HZ,
1950        .to_retries = 5,
1951};
1952
1953/**
1954 * xs_setup_udp - Set up transport to use a UDP socket
1955 * @args: rpc transport creation arguments
1956 *
1957 */
1958static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
1959{
1960        struct sockaddr *addr = args->dstaddr;
1961        struct rpc_xprt *xprt;
1962        struct sock_xprt *transport;
1963
1964        xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1965        if (IS_ERR(xprt))
1966                return xprt;
1967        transport = container_of(xprt, struct sock_xprt, xprt);
1968
1969        xprt->prot = IPPROTO_UDP;
1970        xprt->tsh_size = 0;
1971        /* XXX: header size can vary due to auth type, IPv6, etc. */
1972        xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1973
1974        xprt->bind_timeout = XS_BIND_TO;
1975        xprt->connect_timeout = XS_UDP_CONN_TO;
1976        xprt->reestablish_timeout = XS_UDP_REEST_TO;
1977        xprt->idle_timeout = XS_IDLE_DISC_TO;
1978
1979        xprt->ops = &xs_udp_ops;
1980
1981        xprt->timeout = &xs_udp_default_timeout;
1982
1983        switch (addr->sa_family) {
1984        case AF_INET:
1985                if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1986                        xprt_set_bound(xprt);
1987
1988                INIT_DELAYED_WORK(&transport->connect_worker,
1989                                        xs_udp_connect_worker4);
1990                xs_format_ipv4_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
1991                break;
1992        case AF_INET6:
1993                if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1994                        xprt_set_bound(xprt);
1995
1996                INIT_DELAYED_WORK(&transport->connect_worker,
1997                                        xs_udp_connect_worker6);
1998                xs_format_ipv6_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
1999                break;
2000        default:
2001                kfree(xprt);
2002                return ERR_PTR(-EAFNOSUPPORT);
2003        }
2004
2005        dprintk("RPC:       set up transport to address %s\n",
2006                        xprt->address_strings[RPC_DISPLAY_ALL]);
2007
2008        if (try_module_get(THIS_MODULE))
2009                return xprt;
2010
2011        kfree(xprt->slot);
2012        kfree(xprt);
2013        return ERR_PTR(-EINVAL);
2014}
2015
2016static const struct rpc_timeout xs_tcp_default_timeout = {
2017        .to_initval = 60 * HZ,
2018        .to_maxval = 60 * HZ,
2019        .to_retries = 2,
2020};
2021
2022/**
2023 * xs_setup_tcp - Set up transport to use a TCP socket
2024 * @args: rpc transport creation arguments
2025 *
2026 */
2027static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2028{
2029        struct sockaddr *addr = args->dstaddr;
2030        struct rpc_xprt *xprt;
2031        struct sock_xprt *transport;
2032
2033        xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2034        if (IS_ERR(xprt))
2035                return xprt;
2036        transport = container_of(xprt, struct sock_xprt, xprt);
2037
2038        xprt->prot = IPPROTO_TCP;
2039        xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2040        xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2041
2042        xprt->bind_timeout = XS_BIND_TO;
2043        xprt->connect_timeout = XS_TCP_CONN_TO;
2044        xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2045        xprt->idle_timeout = XS_IDLE_DISC_TO;
2046
2047        xprt->ops = &xs_tcp_ops;
2048        xprt->timeout = &xs_tcp_default_timeout;
2049
2050        switch (addr->sa_family) {
2051        case AF_INET:
2052                if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2053                        xprt_set_bound(xprt);
2054
2055                INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
2056                xs_format_ipv4_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2057                break;
2058        case AF_INET6:
2059                if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2060                        xprt_set_bound(xprt);
2061
2062                INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
2063                xs_format_ipv6_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2064                break;
2065        default:
2066                kfree(xprt);
2067                return ERR_PTR(-EAFNOSUPPORT);
2068        }
2069
2070        dprintk("RPC:       set up transport to address %s\n",
2071                        xprt->address_strings[RPC_DISPLAY_ALL]);
2072
2073        if (try_module_get(THIS_MODULE))
2074                return xprt;
2075
2076        kfree(xprt->slot);
2077        kfree(xprt);
2078        return ERR_PTR(-EINVAL);
2079}
2080
2081static struct xprt_class        xs_udp_transport = {
2082        .list           = LIST_HEAD_INIT(xs_udp_transport.list),
2083        .name           = "udp",
2084        .owner          = THIS_MODULE,
2085        .ident          = IPPROTO_UDP,
2086        .setup          = xs_setup_udp,
2087};
2088
2089static struct xprt_class        xs_tcp_transport = {
2090        .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
2091        .name           = "tcp",
2092        .owner          = THIS_MODULE,
2093        .ident          = IPPROTO_TCP,
2094        .setup          = xs_setup_tcp,
2095};
2096
2097/**
2098 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2099 *
2100 */
2101int init_socket_xprt(void)
2102{
2103#ifdef RPC_DEBUG
2104        if (!sunrpc_table_header)
2105                sunrpc_table_header = register_sysctl_table(sunrpc_table);
2106#endif
2107
2108        xprt_register_transport(&xs_udp_transport);
2109        xprt_register_transport(&xs_tcp_transport);
2110
2111        return 0;
2112}
2113
2114/**
2115 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2116 *
2117 */
2118void cleanup_socket_xprt(void)
2119{
2120#ifdef RPC_DEBUG
2121        if (sunrpc_table_header) {
2122                unregister_sysctl_table(sunrpc_table_header);
2123                sunrpc_table_header = NULL;
2124        }
2125#endif
2126
2127        xprt_unregister_transport(&xs_udp_transport);
2128        xprt_unregister_transport(&xs_tcp_transport);
2129}
2130
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