net/sunrpc/xprtsock.c

   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 Software <alan@redhat.com>
   7  * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
   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/capability.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/errno.h>
  26 #include <linux/socket.h>
  27 #include <linux/in.h>
  28 #include <linux/net.h>
  29 #include <linux/mm.h>
  30 #include <linux/udp.h>
  31 #include <linux/tcp.h>
  32 #include <linux/sunrpc/clnt.h>
  33 #include <linux/sunrpc/sched.h>
  34 #include <linux/file.h>
  35
  36 #include <net/sock.h>
  37 #include <net/checksum.h>
  38 #include <net/udp.h>
  39 #include <net/tcp.h>
  40
  41 /*
  42  * xprtsock tunables
  43  */
  44 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  45 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  46
  47 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  48 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  49
  50 /*
  51  * We can register our own files under /proc/sys/sunrpc by
  52  * calling register_sysctl_table() again.  The files in that
  53  * directory become the union of all files registered there.
  54  *
  55  * We simply need to make sure that we don't collide with
  56  * someone else's file names!
  57  */
  58
  59 #ifdef RPC_DEBUG
  60
  61 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  62 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  63 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  64 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  65
  66 static struct ctl_table_header *sunrpc_table_header;
  67
  68 /*
  69  * FIXME: changing the UDP slot table size should also resize the UDP
  70  *        socket buffers for existing UDP transports
  71  */
  72 static ctl_table xs_tunables_table[] = {
  73         {
  74                 .ctl_name       = CTL_SLOTTABLE_UDP,
  75                 .procname       = "udp_slot_table_entries",
  76                 .data           = &xprt_udp_slot_table_entries,
  77                 .maxlen         = sizeof(unsigned int),
  78                 .mode           = 0644,
  79                 .proc_handler   = &proc_dointvec_minmax,
  80                 .strategy       = &sysctl_intvec,
  81                 .extra1         = &min_slot_table_size,
  82                 .extra2         = &max_slot_table_size
  83         },
  84         {
  85                 .ctl_name       = CTL_SLOTTABLE_TCP,
  86                 .procname       = "tcp_slot_table_entries",
  87                 .data           = &xprt_tcp_slot_table_entries,
  88                 .maxlen         = sizeof(unsigned int),
  89                 .mode           = 0644,
  90                 .proc_handler   = &proc_dointvec_minmax,
  91                 .strategy       = &sysctl_intvec,
  92                 .extra1         = &min_slot_table_size,
  93                 .extra2         = &max_slot_table_size
  94         },
  95         {
  96                 .ctl_name       = CTL_MIN_RESVPORT,
  97                 .procname       = "min_resvport",
  98                 .data           = &xprt_min_resvport,
  99                 .maxlen         = sizeof(unsigned int),
 100                 .mode           = 0644,
 101                 .proc_handler   = &proc_dointvec_minmax,
 102                 .strategy       = &sysctl_intvec,
 103                 .extra1         = &xprt_min_resvport_limit,
 104                 .extra2         = &xprt_max_resvport_limit
 105         },
 106         {
 107                 .ctl_name       = CTL_MAX_RESVPORT,
 108                 .procname       = "max_resvport",
 109                 .data           = &xprt_max_resvport,
 110                 .maxlen         = sizeof(unsigned int),
 111                 .mode           = 0644,
 112                 .proc_handler   = &proc_dointvec_minmax,
 113                 .strategy       = &sysctl_intvec,
 114                 .extra1         = &xprt_min_resvport_limit,
 115                 .extra2         = &xprt_max_resvport_limit
 116         },
 117         {
 118                 .ctl_name = 0,
 119         },
 120 };
 121
 122 static ctl_table sunrpc_table[] = {
 123         {
 124                 .ctl_name       = CTL_SUNRPC,
 125                 .procname       = "sunrpc",
 126                 .mode           = 0555,
 127                 .child          = xs_tunables_table
 128         },
 129         {
 130                 .ctl_name = 0,
 131         },
 132 };
 133
 134 #endif
 135
 136 /*
 137  * How many times to try sending a request on a socket before waiting
 138  * for the socket buffer to clear.
 139  */
 140 #define XS_SENDMSG_RETRY        (10U)
 141
 142 /*
 143  * Time out for an RPC UDP socket connect.  UDP socket connects are
 144  * synchronous, but we set a timeout anyway in case of resource
 145  * exhaustion on the local host.
 146  */
 147 #define XS_UDP_CONN_TO          (5U * HZ)
 148
 149 /*
 150  * Wait duration for an RPC TCP connection to be established.  Solaris
 151  * NFS over TCP uses 60 seconds, for example, which is in line with how
 152  * long a server takes to reboot.
 153  */
 154 #define XS_TCP_CONN_TO          (60U * HZ)
 155
 156 /*
 157  * Wait duration for a reply from the RPC portmapper.
 158  */
 159 #define XS_BIND_TO              (60U * HZ)
 160
 161 /*
 162  * Delay if a UDP socket connect error occurs.  This is most likely some
 163  * kind of resource problem on the local host.
 164  */
 165 #define XS_UDP_REEST_TO         (2U * HZ)
 166
 167 /*
 168  * The reestablish timeout allows clients to delay for a bit before attempting
 169  * to reconnect to a server that just dropped our connection.
 170  *
 171  * We implement an exponential backoff when trying to reestablish a TCP
 172  * transport connection with the server.  Some servers like to drop a TCP
 173  * connection when they are overworked, so we start with a short timeout and
 174  * increase over time if the server is down or not responding.
 175  */
 176 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
 177 #define XS_TCP_MAX_REEST_TO     (5U * 60 * HZ)
 178
 179 /*
 180  * TCP idle timeout; client drops the transport socket if it is idle
 181  * for this long.  Note that we also timeout UDP sockets to prevent
 182  * holding port numbers when there is no RPC traffic.
 183  */
 184 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 185
 186 #ifdef RPC_DEBUG
 187 # undef  RPC_DEBUG_DATA
 188 # define RPCDBG_FACILITY        RPCDBG_TRANS
 189 #endif
 190
 191 #ifdef RPC_DEBUG_DATA
 192 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 193 {
 194         u8 *buf = (u8 *) packet;
 195         int j;
 196
 197         dprintk("RPC:       %s\n", msg);
 198         for (j = 0; j < count && j < 128; j += 4) {
 199                 if (!(j & 31)) {
 200                         if (j)
 201                                 dprintk("\n");
 202                         dprintk("0x%04x ", j);
 203                 }
 204                 dprintk("%02x%02x%02x%02x ",
 205                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
 206         }
 207         dprintk("\n");
 208 }
 209 #else
 210 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 211 {
 212         /* NOP */
 213 }
 214 #endif
 215
 216 struct sock_xprt {
 217         struct rpc_xprt         xprt;
 218
 219         /*
 220          * Network layer
 221          */
 222         struct socket *         sock;
 223         struct sock *           inet;
 224
 225         /*
 226          * State of TCP reply receive
 227          */
 228         __be32                  tcp_fraghdr,
 229                                 tcp_xid;
 230
 231         u32                     tcp_offset,
 232                                 tcp_reclen;
 233
 234         unsigned long           tcp_copied,
 235                                 tcp_flags;
 236
 237         /*
 238          * Connection of transports
 239          */
 240         struct delayed_work     connect_worker;
 241         struct sockaddr_storage addr;
 242         unsigned short          port;
 243
 244         /*
 245          * UDP socket buffer size parameters
 246          */
 247         size_t                  rcvsize,
 248                                 sndsize;
 249
 250         /*
 251          * Saved socket callback addresses
 252          */
 253         void                    (*old_data_ready)(struct sock *, int);
 254         void                    (*old_state_change)(struct sock *);
 255         void                    (*old_write_space)(struct sock *);
 256 };
 257
 258 /*
 259  * TCP receive state flags
 260  */
 261 #define TCP_RCV_LAST_FRAG       (1UL << 0)
 262 #define TCP_RCV_COPY_FRAGHDR    (1UL << 1)
 263 #define TCP_RCV_COPY_XID        (1UL << 2)
 264 #define TCP_RCV_COPY_DATA       (1UL << 3)
 265
 266 static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt)
 267 {
 268         struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr;
 269         char *buf;
 270
 271         buf = kzalloc(20, GFP_KERNEL);
 272         if (buf) {
 273                 snprintf(buf, 20, NIPQUAD_FMT,
 274                                 NIPQUAD(addr->sin_addr.s_addr));
 275         }
 276         xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
 277
 278         buf = kzalloc(8, GFP_KERNEL);
 279         if (buf) {
 280                 snprintf(buf, 8, "%u",
 281                                 ntohs(addr->sin_port));
 282         }
 283         xprt->address_strings[RPC_DISPLAY_PORT] = buf;
 284
 285         buf = kzalloc(8, GFP_KERNEL);
 286         if (buf) {
 287                 if (xprt->prot == IPPROTO_UDP)
 288                         snprintf(buf, 8, "udp");
 289                 else
 290                         snprintf(buf, 8, "tcp");
 291         }
 292         xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
 293
 294         buf = kzalloc(48, GFP_KERNEL);
 295         if (buf) {
 296                 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
 297                         NIPQUAD(addr->sin_addr.s_addr),
 298                         ntohs(addr->sin_port),
 299                         xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
 300         }
 301         xprt->address_strings[RPC_DISPLAY_ALL] = buf;
 302
 303         buf = kzalloc(10, GFP_KERNEL);
 304         if (buf) {
 305                 snprintf(buf, 10, "%02x%02x%02x%02x",
 306                                 NIPQUAD(addr->sin_addr.s_addr));
 307         }
 308         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
 309
 310         buf = kzalloc(8, GFP_KERNEL);
 311         if (buf) {
 312                 snprintf(buf, 8, "%4hx",
 313                                 ntohs(addr->sin_port));
 314         }
 315         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
 316 }
 317
 318 static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt)
 319 {
 320         struct sockaddr_in6 *addr = (struct sockaddr_in6 *) &xprt->addr;
 321         char *buf;
 322
 323         buf = kzalloc(40, GFP_KERNEL);
 324         if (buf) {
 325                 snprintf(buf, 40, NIP6_FMT,
 326                                 NIP6(addr->sin6_addr));
 327         }
 328         xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
 329
 330         buf = kzalloc(8, GFP_KERNEL);
 331         if (buf) {
 332                 snprintf(buf, 8, "%u",
 333                                 ntohs(addr->sin6_port));
 334         }
 335         xprt->address_strings[RPC_DISPLAY_PORT] = buf;
 336
 337         buf = kzalloc(8, GFP_KERNEL);
 338         if (buf) {
 339                 if (xprt->prot == IPPROTO_UDP)
 340                         snprintf(buf, 8, "udp");
 341                 else
 342                         snprintf(buf, 8, "tcp");
 343         }
 344         xprt->address_strings[RPC_DISPLAY_PROTO] = buf;
 345
 346         buf = kzalloc(64, GFP_KERNEL);
 347         if (buf) {
 348                 snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s",
 349                                 NIP6(addr->sin6_addr),
 350                                 ntohs(addr->sin6_port),
 351                                 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
 352         }
 353         xprt->address_strings[RPC_DISPLAY_ALL] = buf;
 354
 355         buf = kzalloc(36, GFP_KERNEL);
 356         if (buf) {
 357                 snprintf(buf, 36, NIP6_SEQFMT,
 358                                 NIP6(addr->sin6_addr));
 359         }
 360         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf;
 361
 362         buf = kzalloc(8, GFP_KERNEL);
 363         if (buf) {
 364                 snprintf(buf, 8, "%4hx",
 365                                 ntohs(addr->sin6_port));
 366         }
 367         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf;
 368 }
 369
 370 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 371 {
 372         int i;
 373
 374         for (i = 0; i < RPC_DISPLAY_MAX; i++)
 375                 kfree(xprt->address_strings[i]);
 376 }
 377
 378 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 379
 380 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
 381 {
 382         struct msghdr msg = {
 383                 .msg_name       = addr,
 384                 .msg_namelen    = addrlen,
 385                 .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
 386         };
 387         struct kvec iov = {
 388                 .iov_base       = vec->iov_base + base,
 389                 .iov_len        = vec->iov_len - base,
 390         };
 391
 392         if (iov.iov_len != 0)
 393                 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
 394         return kernel_sendmsg(sock, &msg, NULL, 0, 0);
 395 }
 396
 397 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
 398 {
 399         struct page **ppage;
 400         unsigned int remainder;
 401         int err, sent = 0;
 402
 403         remainder = xdr->page_len - base;
 404         base += xdr->page_base;
 405         ppage = xdr->pages + (base >> PAGE_SHIFT);
 406         base &= ~PAGE_MASK;
 407         for(;;) {
 408                 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
 409                 int flags = XS_SENDMSG_FLAGS;
 410
 411                 remainder -= len;
 412                 if (remainder != 0 || more)
 413                         flags |= MSG_MORE;
 414                 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
 415                 if (remainder == 0 || err != len)
 416                         break;
 417                 sent += err;
 418                 ppage++;
 419                 base = 0;
 420         }
 421         if (sent == 0)
 422                 return err;
 423         if (err > 0)
 424                 sent += err;
 425         return sent;
 426 }
 427
 428 /**
 429  * xs_sendpages - write pages directly to a socket
 430  * @sock: socket to send on
 431  * @addr: UDP only -- address of destination
 432  * @addrlen: UDP only -- length of destination address
 433  * @xdr: buffer containing this request
 434  * @base: starting position in the buffer
 435  *
 436  */
 437 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
 438 {
 439         unsigned int remainder = xdr->len - base;
 440         int err, sent = 0;
 441
 442         if (unlikely(!sock))
 443                 return -ENOTCONN;
 444
 445         clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
 446         if (base != 0) {
 447                 addr = NULL;
 448                 addrlen = 0;
 449         }
 450
 451         if (base < xdr->head[0].iov_len || addr != NULL) {
 452                 unsigned int len = xdr->head[0].iov_len - base;
 453                 remainder -= len;
 454                 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
 455                 if (remainder == 0 || err != len)
 456                         goto out;
 457                 sent += err;
 458                 base = 0;
 459         } else
 460                 base -= xdr->head[0].iov_len;
 461
 462         if (base < xdr->page_len) {
 463                 unsigned int len = xdr->page_len - base;
 464                 remainder -= len;
 465                 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
 466                 if (remainder == 0 || err != len)
 467                         goto out;
 468                 sent += err;
 469                 base = 0;
 470         } else
 471                 base -= xdr->page_len;
 472
 473         if (base >= xdr->tail[0].iov_len)
 474                 return sent;
 475         err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
 476 out:
 477         if (sent == 0)
 478                 return err;
 479         if (err > 0)
 480                 sent += err;
 481         return sent;
 482 }
 483
 484 /**
 485  * xs_nospace - place task on wait queue if transmit was incomplete
 486  * @task: task to put to sleep
 487  *
 488  */
 489 static void xs_nospace(struct rpc_task *task)
 490 {
 491         struct rpc_rqst *req = task->tk_rqstp;
 492         struct rpc_xprt *xprt = req->rq_xprt;
 493         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 494
 495         dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
 496                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
 497                         req->rq_slen);
 498
 499         if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
 500                 /* Protect against races with write_space */
 501                 spin_lock_bh(&xprt->transport_lock);
 502
 503                 /* Don't race with disconnect */
 504                 if (!xprt_connected(xprt))
 505                         task->tk_status = -ENOTCONN;
 506                 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
 507                         xprt_wait_for_buffer_space(task);
 508
 509                 spin_unlock_bh(&xprt->transport_lock);
 510         } else
 511                 /* Keep holding the socket if it is blocked */
 512                 rpc_delay(task, HZ>>4);
 513 }
 514
 515 /**
 516  * xs_udp_send_request - write an RPC request to a UDP socket
 517  * @task: address of RPC task that manages the state of an RPC request
 518  *
 519  * Return values:
 520  *        0:    The request has been sent
 521  *   EAGAIN:    The socket was blocked, please call again later to
 522  *              complete the request
 523  * ENOTCONN:    Caller needs to invoke connect logic then call again
 524  *    other:    Some other error occured, the request was not sent
 525  */
 526 static int xs_udp_send_request(struct rpc_task *task)
 527 {
 528         struct rpc_rqst *req = task->tk_rqstp;
 529         struct rpc_xprt *xprt = req->rq_xprt;
 530         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 531         struct xdr_buf *xdr = &req->rq_snd_buf;
 532         int status;
 533
 534         xs_pktdump("packet data:",
 535                                 req->rq_svec->iov_base,
 536                                 req->rq_svec->iov_len);
 537
 538         req->rq_xtime = jiffies;
 539         status = xs_sendpages(transport->sock,
 540                               (struct sockaddr *) &xprt->addr,
 541                               xprt->addrlen, xdr,
 542                               req->rq_bytes_sent);
 543
 544         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 545                         xdr->len - req->rq_bytes_sent, status);
 546
 547         if (likely(status >= (int) req->rq_slen))
 548                 return 0;
 549
 550         /* Still some bytes left; set up for a retry later. */
 551         if (status > 0)
 552                 status = -EAGAIN;
 553
 554         switch (status) {
 555         case -ENETUNREACH:
 556         case -EPIPE:
 557         case -ECONNREFUSED:
 558                 /* When the server has died, an ICMP port unreachable message
 559                  * prompts ECONNREFUSED. */
 560                 break;
 561         case -EAGAIN:
 562                 xs_nospace(task);
 563                 break;
 564         default:
 565                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 566                         -status);
 567                 break;
 568         }
 569
 570         return status;
 571 }
 572
 573 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
 574 {
 575         u32 reclen = buf->len - sizeof(rpc_fraghdr);
 576         rpc_fraghdr *base = buf->head[0].iov_base;
 577         *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
 578 }
 579
 580 /**
 581  * xs_tcp_send_request - write an RPC request to a TCP socket
 582  * @task: address of RPC task that manages the state of an RPC request
 583  *
 584  * Return values:
 585  *        0:    The request has been sent
 586  *   EAGAIN:    The socket was blocked, please call again later to
 587  *              complete the request
 588  * ENOTCONN:    Caller needs to invoke connect logic then call again
 589  *    other:    Some other error occured, the request was not sent
 590  *
 591  * XXX: In the case of soft timeouts, should we eventually give up
 592  *      if sendmsg is not able to make progress?
 593  */
 594 static int xs_tcp_send_request(struct rpc_task *task)
 595 {
 596         struct rpc_rqst *req = task->tk_rqstp;
 597         struct rpc_xprt *xprt = req->rq_xprt;
 598         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 599         struct xdr_buf *xdr = &req->rq_snd_buf;
 600         int status;
 601         unsigned int retry = 0;
 602
 603         xs_encode_tcp_record_marker(&req->rq_snd_buf);
 604
 605         xs_pktdump("packet data:",
 606                                 req->rq_svec->iov_base,
 607                                 req->rq_svec->iov_len);
 608
 609         /* Continue transmitting the packet/record. We must be careful
 610          * to cope with writespace callbacks arriving _after_ we have
 611          * called sendmsg(). */
 612         while (1) {
 613                 req->rq_xtime = jiffies;
 614                 status = xs_sendpages(transport->sock,
 615                                         NULL, 0, xdr, req->rq_bytes_sent);
 616
 617                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
 618                                 xdr->len - req->rq_bytes_sent, status);
 619
 620                 if (unlikely(status < 0))
 621                         break;
 622
 623                 /* If we've sent the entire packet, immediately
 624                  * reset the count of bytes sent. */
 625                 req->rq_bytes_sent += status;
 626                 task->tk_bytes_sent += status;
 627                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
 628                         req->rq_bytes_sent = 0;
 629                         return 0;
 630                 }
 631
 632                 status = -EAGAIN;
 633                 if (retry++ > XS_SENDMSG_RETRY)
 634                         break;
 635         }
 636
 637         switch (status) {
 638         case -EAGAIN:
 639                 xs_nospace(task);
 640                 break;
 641         case -ECONNREFUSED:
 642         case -ECONNRESET:
 643         case -ENOTCONN:
 644         case -EPIPE:
 645                 status = -ENOTCONN;
 646                 break;
 647         default:
 648                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 649                         -status);
 650                 xprt_disconnect(xprt);
 651                 break;
 652         }
 653
 654         return status;
 655 }
 656
 657 /**
 658  * xs_tcp_release_xprt - clean up after a tcp transmission
 659  * @xprt: transport
 660  * @task: rpc task
 661  *
 662  * This cleans up if an error causes us to abort the transmission of a request.
 663  * In this case, the socket may need to be reset in order to avoid confusing
 664  * the server.
 665  */
 666 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
 667 {
 668         struct rpc_rqst *req;
 669
 670         if (task != xprt->snd_task)
 671                 return;
 672         if (task == NULL)
 673                 goto out_release;
 674         req = task->tk_rqstp;
 675         if (req->rq_bytes_sent == 0)
 676                 goto out_release;
 677         if (req->rq_bytes_sent == req->rq_snd_buf.len)
 678                 goto out_release;
 679         set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
 680 out_release:
 681         xprt_release_xprt(xprt, task);
 682 }
 683
 684 /**
 685  * xs_close - close a socket
 686  * @xprt: transport
 687  *
 688  * This is used when all requests are complete; ie, no DRC state remains
 689  * on the server we want to save.
 690  */
 691 static void xs_close(struct rpc_xprt *xprt)
 692 {
 693         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 694         struct socket *sock = transport->sock;
 695         struct sock *sk = transport->inet;
 696
 697         if (!sk)
 698                 goto clear_close_wait;
 699
 700         dprintk("RPC:       xs_close xprt %p\n", xprt);
 701
 702         write_lock_bh(&sk->sk_callback_lock);
 703         transport->inet = NULL;
 704         transport->sock = NULL;
 705
 706         sk->sk_user_data = NULL;
 707         sk->sk_data_ready = transport->old_data_ready;
 708         sk->sk_state_change = transport->old_state_change;
 709         sk->sk_write_space = transport->old_write_space;
 710         write_unlock_bh(&sk->sk_callback_lock);
 711
 712         sk->sk_no_check = 0;
 713
 714         sock_release(sock);
 715 clear_close_wait:
 716         smp_mb__before_clear_bit();
 717         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
 718         smp_mb__after_clear_bit();
 719 }
 720
 721 /**
 722  * xs_destroy - prepare to shutdown a transport
 723  * @xprt: doomed transport
 724  *
 725  */
 726 static void xs_destroy(struct rpc_xprt *xprt)
 727 {
 728         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 729
 730         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
 731
 732         cancel_rearming_delayed_work(&transport->connect_worker);
 733
 734         xprt_disconnect(xprt);
 735         xs_close(xprt);
 736         xs_free_peer_addresses(xprt);
 737         kfree(xprt->slot);
 738         kfree(xprt);
 739 }
 740
 741 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 742 {
 743         return (struct rpc_xprt *) sk->sk_user_data;
 744 }
 745
 746 /**
 747  * xs_udp_data_ready - "data ready" callback for UDP sockets
 748  * @sk: socket with data to read
 749  * @len: how much data to read
 750  *
 751  */
 752 static void xs_udp_data_ready(struct sock *sk, int len)
 753 {
 754         struct rpc_task *task;
 755         struct rpc_xprt *xprt;
 756         struct rpc_rqst *rovr;
 757         struct sk_buff *skb;
 758         int err, repsize, copied;
 759         u32 _xid;
 760         __be32 *xp;
 761
 762         read_lock(&sk->sk_callback_lock);
 763         dprintk("RPC:       xs_udp_data_ready...\n");
 764         if (!(xprt = xprt_from_sock(sk)))
 765                 goto out;
 766
 767         if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
 768                 goto out;
 769
 770         if (xprt->shutdown)
 771                 goto dropit;
 772
 773         repsize = skb->len - sizeof(struct udphdr);
 774         if (repsize < 4) {
 775                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
 776                 goto dropit;
 777         }
 778
 779         /* Copy the XID from the skb... */
 780         xp = skb_header_pointer(skb, sizeof(struct udphdr),
 781                                 sizeof(_xid), &_xid);
 782         if (xp == NULL)
 783                 goto dropit;
 784
 785         /* Look up and lock the request corresponding to the given XID */
 786         spin_lock(&xprt->transport_lock);
 787         rovr = xprt_lookup_rqst(xprt, *xp);
 788         if (!rovr)
 789                 goto out_unlock;
 790         task = rovr->rq_task;
 791
 792         if ((copied = rovr->rq_private_buf.buflen) > repsize)
 793                 copied = repsize;
 794
 795         /* Suck it into the iovec, verify checksum if not done by hw. */
 796         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
 797                 goto out_unlock;
 798
 799         /* Something worked... */
 800         dst_confirm(skb->dst);
 801
 802         xprt_adjust_cwnd(task, copied);
 803         xprt_update_rtt(task);
 804         xprt_complete_rqst(task, copied);
 805
 806  out_unlock:
 807         spin_unlock(&xprt->transport_lock);
 808  dropit:
 809         skb_free_datagram(sk, skb);
 810  out:
 811         read_unlock(&sk->sk_callback_lock);
 812 }
 813
 814 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
 815 {
 816         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 817         size_t len, used;
 818         char *p;
 819
 820         p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
 821         len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
 822         used = xdr_skb_read_bits(desc, p, len);
 823         transport->tcp_offset += used;
 824         if (used != len)
 825                 return;
 826
 827         transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
 828         if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
 829                 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
 830         else
 831                 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
 832         transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
 833
 834         transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
 835         transport->tcp_offset = 0;
 836
 837         /* Sanity check of the record length */
 838         if (unlikely(transport->tcp_reclen < 4)) {
 839                 dprintk("RPC:       invalid TCP record fragment length\n");
 840                 xprt_disconnect(xprt);
 841                 return;
 842         }
 843         dprintk("RPC:       reading TCP record fragment of length %d\n",
 844                         transport->tcp_reclen);
 845 }
 846
 847 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
 848 {
 849         if (transport->tcp_offset == transport->tcp_reclen) {
 850                 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
 851                 transport->tcp_offset = 0;
 852                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
 853                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 854                         transport->tcp_flags |= TCP_RCV_COPY_XID;
 855                         transport->tcp_copied = 0;
 856                 }
 857         }
 858 }
 859
 860 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
 861 {
 862         size_t len, used;
 863         char *p;
 864
 865         len = sizeof(transport->tcp_xid) - transport->tcp_offset;
 866         dprintk("RPC:       reading XID (%Zu bytes)\n", len);
 867         p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
 868         used = xdr_skb_read_bits(desc, p, len);
 869         transport->tcp_offset += used;
 870         if (used != len)
 871                 return;
 872         transport->tcp_flags &= ~TCP_RCV_COPY_XID;
 873         transport->tcp_flags |= TCP_RCV_COPY_DATA;
 874         transport->tcp_copied = 4;
 875         dprintk("RPC:       reading reply for XID %08x\n",
 876                         ntohl(transport->tcp_xid));
 877         xs_tcp_check_fraghdr(transport);
 878 }
 879
 880 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
 881 {
 882         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 883         struct rpc_rqst *req;
 884         struct xdr_buf *rcvbuf;
 885         size_t len;
 886         ssize_t r;
 887
 888         /* Find and lock the request corresponding to this xid */
 889         spin_lock(&xprt->transport_lock);
 890         req = xprt_lookup_rqst(xprt, transport->tcp_xid);
 891         if (!req) {
 892                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 893                 dprintk("RPC:       XID %08x request not found!\n",
 894                                 ntohl(transport->tcp_xid));
 895                 spin_unlock(&xprt->transport_lock);
 896                 return;
 897         }
 898
 899         rcvbuf = &req->rq_private_buf;
 900         len = desc->count;
 901         if (len > transport->tcp_reclen - transport->tcp_offset) {
 902                 struct xdr_skb_reader my_desc;
 903
 904                 len = transport->tcp_reclen - transport->tcp_offset;
 905                 memcpy(&my_desc, desc, sizeof(my_desc));
 906                 my_desc.count = len;
 907                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
 908                                           &my_desc, xdr_skb_read_bits);
 909                 desc->count -= r;
 910                 desc->offset += r;
 911         } else
 912                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
 913                                           desc, xdr_skb_read_bits);
 914
 915         if (r > 0) {
 916                 transport->tcp_copied += r;
 917                 transport->tcp_offset += r;
 918         }
 919         if (r != len) {
 920                 /* Error when copying to the receive buffer,
 921                  * usually because we weren't able to allocate
 922                  * additional buffer pages. All we can do now
 923                  * is turn off TCP_RCV_COPY_DATA, so the request
 924                  * will not receive any additional updates,
 925                  * and time out.
 926                  * Any remaining data from this record will
 927                  * be discarded.
 928                  */
 929                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 930                 dprintk("RPC:       XID %08x truncated request\n",
 931                                 ntohl(transport->tcp_xid));
 932                 dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
 933                                 "tcp_offset = %u, tcp_reclen = %u\n",
 934                                 xprt, transport->tcp_copied,
 935                                 transport->tcp_offset, transport->tcp_reclen);
 936                 goto out;
 937         }
 938
 939         dprintk("RPC:       XID %08x read %Zd bytes\n",
 940                         ntohl(transport->tcp_xid), r);
 941         dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
 942                         "tcp_reclen = %u\n", xprt, transport->tcp_copied,
 943                         transport->tcp_offset, transport->tcp_reclen);
 944
 945         if (transport->tcp_copied == req->rq_private_buf.buflen)
 946                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 947         else if (transport->tcp_offset == transport->tcp_reclen) {
 948                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
 949                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
 950         }
 951
 952 out:
 953         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
 954                 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
 955         spin_unlock(&xprt->transport_lock);
 956         xs_tcp_check_fraghdr(transport);
 957 }
 958
 959 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
 960 {
 961         size_t len;
 962
 963         len = transport->tcp_reclen - transport->tcp_offset;
 964         if (len > desc->count)
 965                 len = desc->count;
 966         desc->count -= len;
 967         desc->offset += len;
 968         transport->tcp_offset += len;
 969         dprintk("RPC:       discarded %Zu bytes\n", len);
 970         xs_tcp_check_fraghdr(transport);
 971 }
 972
 973 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
 974 {
 975         struct rpc_xprt *xprt = rd_desc->arg.data;
 976         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 977         struct xdr_skb_reader desc = {
 978                 .skb    = skb,
 979                 .offset = offset,
 980                 .count  = len,
 981         };
 982
 983         dprintk("RPC:       xs_tcp_data_recv started\n");
 984         do {
 985                 /* Read in a new fragment marker if necessary */
 986                 /* Can we ever really expect to get completely empty fragments? */
 987                 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
 988                         xs_tcp_read_fraghdr(xprt, &desc);
 989                         continue;
 990                 }
 991                 /* Read in the xid if necessary */
 992                 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
 993                         xs_tcp_read_xid(transport, &desc);
 994                         continue;
 995                 }
 996                 /* Read in the request data */
 997                 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
 998                         xs_tcp_read_request(xprt, &desc);
 999                         continue;
1000                 }
1001                 /* Skip over any trailing bytes on short reads */
1002                 xs_tcp_read_discard(transport, &desc);
1003         } while (desc.count);
1004         dprintk("RPC:       xs_tcp_data_recv done\n");
1005         return len - desc.count;
1006 }
1007
1008 /**
1009  * xs_tcp_data_ready - "data ready" callback for TCP sockets
1010  * @sk: socket with data to read
1011  * @bytes: how much data to read
1012  *
1013  */
1014 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1015 {
1016         struct rpc_xprt *xprt;
1017         read_descriptor_t rd_desc;
1018
1019         dprintk("RPC:       xs_tcp_data_ready...\n");
1020
1021         read_lock(&sk->sk_callback_lock);
1022         if (!(xprt = xprt_from_sock(sk)))
1023                 goto out;
1024         if (xprt->shutdown)
1025                 goto out;
1026
1027         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1028         rd_desc.arg.data = xprt;
1029         rd_desc.count = 65536;
1030         tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1031 out:
1032         read_unlock(&sk->sk_callback_lock);
1033 }
1034
1035 /**
1036  * xs_tcp_state_change - callback to handle TCP socket state changes
1037  * @sk: socket whose state has changed
1038  *
1039  */
1040 static void xs_tcp_state_change(struct sock *sk)
1041 {
1042         struct rpc_xprt *xprt;
1043
1044         read_lock(&sk->sk_callback_lock);
1045         if (!(xprt = xprt_from_sock(sk)))
1046                 goto out;
1047         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1048         dprintk("RPC:       state %x conn %d dead %d zapped %d\n",
1049                         sk->sk_state, xprt_connected(xprt),
1050                         sock_flag(sk, SOCK_DEAD),
1051                         sock_flag(sk, SOCK_ZAPPED));
1052
1053         switch (sk->sk_state) {
1054         case TCP_ESTABLISHED:
1055                 spin_lock_bh(&xprt->transport_lock);
1056                 if (!xprt_test_and_set_connected(xprt)) {
1057                         struct sock_xprt *transport = container_of(xprt,
1058                                         struct sock_xprt, xprt);
1059
1060                         /* Reset TCP record info */
1061                         transport->tcp_offset = 0;
1062                         transport->tcp_reclen = 0;
1063                         transport->tcp_copied = 0;
1064                         transport->tcp_flags =
1065                                 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1066
1067                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1068                         xprt_wake_pending_tasks(xprt, 0);
1069                 }
1070                 spin_unlock_bh(&xprt->transport_lock);
1071                 break;
1072         case TCP_SYN_SENT:
1073         case TCP_SYN_RECV:
1074                 break;
1075         case TCP_CLOSE_WAIT:
1076                 /* Try to schedule an autoclose RPC calls */
1077                 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1078                 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1079                         queue_work(rpciod_workqueue, &xprt->task_cleanup);
1080         default:
1081                 xprt_disconnect(xprt);
1082         }
1083  out:
1084         read_unlock(&sk->sk_callback_lock);
1085 }
1086
1087 /**
1088  * xs_udp_write_space - callback invoked when socket buffer space
1089  *                             becomes available
1090  * @sk: socket whose state has changed
1091  *
1092  * Called when more output buffer space is available for this socket.
1093  * We try not to wake our writers until they can make "significant"
1094  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1095  * with a bunch of small requests.
1096  */
1097 static void xs_udp_write_space(struct sock *sk)
1098 {
1099         read_lock(&sk->sk_callback_lock);
1100
1101         /* from net/core/sock.c:sock_def_write_space */
1102         if (sock_writeable(sk)) {
1103                 struct socket *sock;
1104                 struct rpc_xprt *xprt;
1105
1106                 if (unlikely(!(sock = sk->sk_socket)))
1107                         goto out;
1108                 if (unlikely(!(xprt = xprt_from_sock(sk))))
1109                         goto out;
1110                 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1111                         goto out;
1112
1113                 xprt_write_space(xprt);
1114         }
1115
1116  out:
1117         read_unlock(&sk->sk_callback_lock);
1118 }
1119
1120 /**
1121  * xs_tcp_write_space - callback invoked when socket buffer space
1122  *                             becomes available
1123  * @sk: socket whose state has changed
1124  *
1125  * Called when more output buffer space is available for this socket.
1126  * We try not to wake our writers until they can make "significant"
1127  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1128  * with a bunch of small requests.
1129  */
1130 static void xs_tcp_write_space(struct sock *sk)
1131 {
1132         read_lock(&sk->sk_callback_lock);
1133
1134         /* from net/core/stream.c:sk_stream_write_space */
1135         if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1136                 struct socket *sock;
1137                 struct rpc_xprt *xprt;
1138
1139                 if (unlikely(!(sock = sk->sk_socket)))
1140                         goto out;
1141                 if (unlikely(!(xprt = xprt_from_sock(sk))))
1142                         goto out;
1143                 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1144                         goto out;
1145
1146                 xprt_write_space(xprt);
1147         }
1148
1149  out:
1150         read_unlock(&sk->sk_callback_lock);
1151 }
1152
1153 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1154 {
1155         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1156         struct sock *sk = transport->inet;
1157
1158         if (transport->rcvsize) {
1159                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1160                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1161         }
1162         if (transport->sndsize) {
1163                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1164                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1165                 sk->sk_write_space(sk);
1166         }
1167 }
1168
1169 /**
1170  * xs_udp_set_buffer_size - set send and receive limits
1171  * @xprt: generic transport
1172  * @sndsize: requested size of send buffer, in bytes
1173  * @rcvsize: requested size of receive buffer, in bytes
1174  *
1175  * Set socket send and receive buffer size limits.
1176  */
1177 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1178 {
1179         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1180
1181         transport->sndsize = 0;
1182         if (sndsize)
1183                 transport->sndsize = sndsize + 1024;
1184         transport->rcvsize = 0;
1185         if (rcvsize)
1186                 transport->rcvsize = rcvsize + 1024;
1187
1188         xs_udp_do_set_buffer_size(xprt);
1189 }
1190
1191 /**
1192  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1193  * @task: task that timed out
1194  *
1195  * Adjust the congestion window after a retransmit timeout has occurred.
1196  */
1197 static void xs_udp_timer(struct rpc_task *task)
1198 {
1199         xprt_adjust_cwnd(task, -ETIMEDOUT);
1200 }
1201
1202 static unsigned short xs_get_random_port(void)
1203 {
1204         unsigned short range = xprt_max_resvport - xprt_min_resvport;
1205         unsigned short rand = (unsigned short) net_random() % range;
1206         return rand + xprt_min_resvport;
1207 }
1208
1209 /**
1210  * xs_set_port - reset the port number in the remote endpoint address
1211  * @xprt: generic transport
1212  * @port: new port number
1213  *
1214  */
1215 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1216 {
1217         struct sockaddr *addr = (struct sockaddr *) &xprt->addr;
1218
1219         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1220
1221         switch (addr->sa_family) {
1222         case AF_INET:
1223                 ((struct sockaddr_in *)addr)->sin_port = htons(port);
1224                 break;
1225         case AF_INET6:
1226                 ((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
1227                 break;
1228         default:
1229                 BUG();
1230         }
1231 }
1232
1233 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1234 {
1235         struct sockaddr_in myaddr = {
1236                 .sin_family = AF_INET,
1237         };
1238         struct sockaddr_in *sa;
1239         int err;
1240         unsigned short port = transport->port;
1241
1242         if (!transport->xprt.resvport)
1243                 port = 0;
1244         sa = (struct sockaddr_in *)&transport->addr;
1245         myaddr.sin_addr = sa->sin_addr;
1246         do {
1247                 myaddr.sin_port = htons(port);
1248                 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1249                                                 sizeof(myaddr));
1250                 if (!transport->xprt.resvport)
1251                         break;
1252                 if (err == 0) {
1253                         transport->port = port;
1254                         break;
1255                 }
1256                 if (port <= xprt_min_resvport)
1257                         port = xprt_max_resvport;
1258                 else
1259                         port--;
1260         } while (err == -EADDRINUSE && port != transport->port);
1261         dprintk("RPC:       %s "NIPQUAD_FMT":%u: %s (%d)\n",
1262                         __FUNCTION__, NIPQUAD(myaddr.sin_addr),
1263                         port, err ? "failed" : "ok", err);
1264         return err;
1265 }
1266
1267 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1268 {
1269         struct sockaddr_in6 myaddr = {
1270                 .sin6_family = AF_INET6,
1271         };
1272         struct sockaddr_in6 *sa;
1273         int err;
1274         unsigned short port = transport->port;
1275
1276         if (!transport->xprt.resvport)
1277                 port = 0;
1278         sa = (struct sockaddr_in6 *)&transport->addr;
1279         myaddr.sin6_addr = sa->sin6_addr;
1280         do {
1281                 myaddr.sin6_port = htons(port);
1282                 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1283                                                 sizeof(myaddr));
1284                 if (!transport->xprt.resvport)
1285                         break;
1286                 if (err == 0) {
1287                         transport->port = port;
1288                         break;
1289                 }
1290                 if (port <= xprt_min_resvport)
1291                         port = xprt_max_resvport;
1292                 else
1293                         port--;
1294         } while (err == -EADDRINUSE && port != transport->port);
1295         dprintk("RPC:       xs_bind6 "NIP6_FMT":%u: %s (%d)\n",
1296                 NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err);
1297         return err;
1298 }
1299
1300 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1301 static struct lock_class_key xs_key[2];
1302 static struct lock_class_key xs_slock_key[2];
1303
1304 static inline void xs_reclassify_socket(struct socket *sock)
1305 {
1306         struct sock *sk = sock->sk;
1307         BUG_ON(sk->sk_lock.owner != NULL);
1308         switch (sk->sk_family) {
1309         case AF_INET:
1310                 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
1311                         &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
1312                 break;
1313
1314         case AF_INET6:
1315                 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
1316                         &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
1317                 break;
1318
1319         default:
1320                 BUG();
1321         }
1322 }
1323 #else
1324 static inline void xs_reclassify_socket(struct socket *sock)
1325 {
1326 }
1327 #endif
1328
1329 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1330 {
1331         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1332
1333         if (!transport->inet) {
1334                 struct sock *sk = sock->sk;
1335
1336                 write_lock_bh(&sk->sk_callback_lock);
1337
1338                 sk->sk_user_data = xprt;
1339                 transport->old_data_ready = sk->sk_data_ready;
1340                 transport->old_state_change = sk->sk_state_change;
1341                 transport->old_write_space = sk->sk_write_space;
1342                 sk->sk_data_ready = xs_udp_data_ready;
1343                 sk->sk_write_space = xs_udp_write_space;
1344                 sk->sk_no_check = UDP_CSUM_NORCV;
1345                 sk->sk_allocation = GFP_ATOMIC;
1346
1347                 xprt_set_connected(xprt);
1348
1349                 /* Reset to new socket */
1350                 transport->sock = sock;
1351                 transport->inet = sk;
1352
1353                 write_unlock_bh(&sk->sk_callback_lock);
1354         }
1355         xs_udp_do_set_buffer_size(xprt);
1356 }
1357
1358 /**
1359  * xs_udp_connect_worker4 - set up a UDP socket
1360  * @work: RPC transport to connect
1361  *
1362  * Invoked by a work queue tasklet.
1363  */
1364 static void xs_udp_connect_worker4(struct work_struct *work)
1365 {
1366         struct sock_xprt *transport =
1367                 container_of(work, struct sock_xprt, connect_worker.work);
1368         struct rpc_xprt *xprt = &transport->xprt;
1369         struct socket *sock = transport->sock;
1370         int err, status = -EIO;
1371
1372         if (xprt->shutdown || !xprt_bound(xprt))
1373                 goto out;
1374
1375         /* Start by resetting any existing state */
1376         xs_close(xprt);
1377
1378         if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1379                 dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1380                 goto out;
1381         }
1382         xs_reclassify_socket(sock);
1383
1384         if (xs_bind4(transport, sock)) {
1385                 sock_release(sock);
1386                 goto out;
1387         }
1388
1389         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1390                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1391
1392         xs_udp_finish_connecting(xprt, sock);
1393         status = 0;
1394 out:
1395         xprt_wake_pending_tasks(xprt, status);
1396         xprt_clear_connecting(xprt);
1397 }
1398
1399 /**
1400  * xs_udp_connect_worker6 - set up a UDP socket
1401  * @work: RPC transport to connect
1402  *
1403  * Invoked by a work queue tasklet.
1404  */
1405 static void xs_udp_connect_worker6(struct work_struct *work)
1406 {
1407         struct sock_xprt *transport =
1408                 container_of(work, struct sock_xprt, connect_worker.work);
1409         struct rpc_xprt *xprt = &transport->xprt;
1410         struct socket *sock = transport->sock;
1411         int err, status = -EIO;
1412
1413         if (xprt->shutdown || !xprt_bound(xprt))
1414                 goto out;
1415
1416         /* Start by resetting any existing state */
1417         xs_close(xprt);
1418
1419         if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1420                 dprintk("RPC:       can't create UDP transport socket (%d).\n", -err);
1421                 goto out;
1422         }
1423         xs_reclassify_socket(sock);
1424
1425         if (xs_bind6(transport, sock) < 0) {
1426                 sock_release(sock);
1427                 goto out;
1428         }
1429
1430         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1431                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1432
1433         xs_udp_finish_connecting(xprt, sock);
1434         status = 0;
1435 out:
1436         xprt_wake_pending_tasks(xprt, status);
1437         xprt_clear_connecting(xprt);
1438 }
1439
1440 /*
1441  * We need to preserve the port number so the reply cache on the server can
1442  * find our cached RPC replies when we get around to reconnecting.
1443  */
1444 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1445 {
1446         int result;
1447         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1448         struct sockaddr any;
1449
1450         dprintk("RPC:       disconnecting xprt %p to reuse port\n", xprt);
1451
1452         /*
1453          * Disconnect the transport socket by doing a connect operation
1454          * with AF_UNSPEC.  This should return immediately...
1455          */
1456         memset(&any, 0, sizeof(any));
1457         any.sa_family = AF_UNSPEC;
1458         result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1459         if (result)
1460                 dprintk("RPC:       AF_UNSPEC connect return code %d\n",
1461                                 result);
1462 }
1463
1464 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1465 {
1466         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1467
1468         if (!transport->inet) {
1469                 struct sock *sk = sock->sk;
1470
1471                 write_lock_bh(&sk->sk_callback_lock);
1472
1473                 sk->sk_user_data = xprt;
1474                 transport->old_data_ready = sk->sk_data_ready;
1475                 transport->old_state_change = sk->sk_state_change;
1476                 transport->old_write_space = sk->sk_write_space;
1477                 sk->sk_data_ready = xs_tcp_data_ready;
1478                 sk->sk_state_change = xs_tcp_state_change;
1479                 sk->sk_write_space = xs_tcp_write_space;
1480                 sk->sk_allocation = GFP_ATOMIC;
1481
1482                 /* socket options */
1483                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1484                 sock_reset_flag(sk, SOCK_LINGER);
1485                 tcp_sk(sk)->linger2 = 0;
1486                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1487
1488                 xprt_clear_connected(xprt);
1489
1490                 /* Reset to new socket */
1491                 transport->sock = sock;
1492                 transport->inet = sk;
1493
1494                 write_unlock_bh(&sk->sk_callback_lock);
1495         }
1496
1497         /* Tell the socket layer to start connecting... */
1498         xprt->stat.connect_count++;
1499         xprt->stat.connect_start = jiffies;
1500         return kernel_connect(sock, (struct sockaddr *) &xprt->addr,
1501                         xprt->addrlen, O_NONBLOCK);
1502 }
1503
1504 /**
1505  * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1506  * @work: RPC transport to connect
1507  *
1508  * Invoked by a work queue tasklet.
1509  */
1510 static void xs_tcp_connect_worker4(struct work_struct *work)
1511 {
1512         struct sock_xprt *transport =
1513                 container_of(work, struct sock_xprt, connect_worker.work);
1514         struct rpc_xprt *xprt = &transport->xprt;
1515         struct socket *sock = transport->sock;
1516         int err, status = -EIO;
1517
1518         if (xprt->shutdown || !xprt_bound(xprt))
1519                 goto out;
1520
1521         if (!sock) {
1522                 /* start from scratch */
1523                 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1524                         dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1525                         goto out;
1526                 }
1527                 xs_reclassify_socket(sock);
1528
1529                 if (xs_bind4(transport, sock) < 0) {
1530                         sock_release(sock);
1531                         goto out;
1532                 }
1533         } else
1534                 /* "close" the socket, preserving the local port */
1535                 xs_tcp_reuse_connection(xprt);
1536
1537         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1538                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1539
1540         status = xs_tcp_finish_connecting(xprt, sock);
1541         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1542                         xprt, -status, xprt_connected(xprt),
1543                         sock->sk->sk_state);
1544         if (status < 0) {
1545                 switch (status) {
1546                         case -EINPROGRESS:
1547                         case -EALREADY:
1548                                 goto out_clear;
1549                         case -ECONNREFUSED:
1550                         case -ECONNRESET:
1551                                 /* retry with existing socket, after a delay */
1552                                 break;
1553                         default:
1554                                 /* get rid of existing socket, and retry */
1555                                 xs_close(xprt);
1556                                 break;
1557                 }
1558         }
1559 out:
1560         xprt_wake_pending_tasks(xprt, status);
1561 out_clear:
1562         xprt_clear_connecting(xprt);
1563 }
1564
1565 /**
1566  * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1567  * @work: RPC transport to connect
1568  *
1569  * Invoked by a work queue tasklet.
1570  */
1571 static void xs_tcp_connect_worker6(struct work_struct *work)
1572 {
1573         struct sock_xprt *transport =
1574                 container_of(work, struct sock_xprt, connect_worker.work);
1575         struct rpc_xprt *xprt = &transport->xprt;
1576         struct socket *sock = transport->sock;
1577         int err, status = -EIO;
1578
1579         if (xprt->shutdown || !xprt_bound(xprt))
1580                 goto out;
1581
1582         if (!sock) {
1583                 /* start from scratch */
1584                 if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1585                         dprintk("RPC:       can't create TCP transport socket (%d).\n", -err);
1586                         goto out;
1587                 }
1588                 xs_reclassify_socket(sock);
1589
1590                 if (xs_bind6(transport, sock) < 0) {
1591                         sock_release(sock);
1592                         goto out;
1593                 }
1594         } else
1595                 /* "close" the socket, preserving the local port */
1596                 xs_tcp_reuse_connection(xprt);
1597
1598         dprintk("RPC:       worker connecting xprt %p to address: %s\n",
1599                         xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1600
1601         status = xs_tcp_finish_connecting(xprt, sock);
1602         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
1603                         xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1604         if (status < 0) {
1605                 switch (status) {
1606                         case -EINPROGRESS:
1607                         case -EALREADY:
1608                                 goto out_clear;
1609                         case -ECONNREFUSED:
1610                         case -ECONNRESET:
1611                                 /* retry with existing socket, after a delay */
1612                                 break;
1613                         default:
1614                                 /* get rid of existing socket, and retry */
1615                                 xs_close(xprt);
1616                                 break;
1617                 }
1618         }
1619 out:
1620         xprt_wake_pending_tasks(xprt, status);
1621 out_clear:
1622         xprt_clear_connecting(xprt);
1623 }
1624
1625 /**
1626  * xs_connect - connect a socket to a remote endpoint
1627  * @task: address of RPC task that manages state of connect request
1628  *
1629  * TCP: If the remote end dropped the connection, delay reconnecting.
1630  *
1631  * UDP socket connects are synchronous, but we use a work queue anyway
1632  * to guarantee that even unprivileged user processes can set up a
1633  * socket on a privileged port.
1634  *
1635  * If a UDP socket connect fails, the delay behavior here prevents
1636  * retry floods (hard mounts).
1637  */
1638 static void xs_connect(struct rpc_task *task)
1639 {
1640         struct rpc_xprt *xprt = task->tk_xprt;
1641         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1642
1643         if (xprt_test_and_set_connecting(xprt))
1644                 return;
1645
1646         if (transport->sock != NULL) {
1647                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
1648                                 "seconds\n",
1649                                 xprt, xprt->reestablish_timeout / HZ);
1650                 queue_delayed_work(rpciod_workqueue,
1651                                    &transport->connect_worker,
1652                                    xprt->reestablish_timeout);
1653                 xprt->reestablish_timeout <<= 1;
1654                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1655                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1656         } else {
1657                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
1658                 queue_delayed_work(rpciod_workqueue,
1659                                    &transport->connect_worker, 0);
1660         }
1661 }
1662
1663 /**
1664  * xs_udp_print_stats - display UDP socket-specifc stats
1665  * @xprt: rpc_xprt struct containing statistics
1666  * @seq: output file
1667  *
1668  */
1669 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1670 {
1671         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1672
1673         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1674                         transport->port,
1675                         xprt->stat.bind_count,
1676                         xprt->stat.sends,
1677                         xprt->stat.recvs,
1678                         xprt->stat.bad_xids,
1679                         xprt->stat.req_u,
1680                         xprt->stat.bklog_u);
1681 }
1682
1683 /**
1684  * xs_tcp_print_stats - display TCP socket-specifc stats
1685  * @xprt: rpc_xprt struct containing statistics
1686  * @seq: output file
1687  *
1688  */
1689 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1690 {
1691         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1692         long idle_time = 0;
1693
1694         if (xprt_connected(xprt))
1695                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1696
1697         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1698                         transport->port,
1699                         xprt->stat.bind_count,
1700                         xprt->stat.connect_count,
1701                         xprt->stat.connect_time,
1702                         idle_time,
1703                         xprt->stat.sends,
1704                         xprt->stat.recvs,
1705                         xprt->stat.bad_xids,
1706                         xprt->stat.req_u,
1707                         xprt->stat.bklog_u);
1708 }
1709
1710 static struct rpc_xprt_ops xs_udp_ops = {
1711         .set_buffer_size        = xs_udp_set_buffer_size,
1712         .reserve_xprt           = xprt_reserve_xprt_cong,
1713         .release_xprt           = xprt_release_xprt_cong,
1714         .rpcbind                = rpcb_getport_async,
1715         .set_port               = xs_set_port,
1716         .connect                = xs_connect,
1717         .buf_alloc              = rpc_malloc,
1718         .buf_free               = rpc_free,
1719         .send_request           = xs_udp_send_request,
1720         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
1721         .timer                  = xs_udp_timer,
1722         .release_request        = xprt_release_rqst_cong,
1723         .close                  = xs_close,
1724         .destroy                = xs_destroy,
1725         .print_stats            = xs_udp_print_stats,
1726 };
1727
1728 static struct rpc_xprt_ops xs_tcp_ops = {
1729         .reserve_xprt           = xprt_reserve_xprt,
1730         .release_xprt           = xs_tcp_release_xprt,
1731         .rpcbind                = rpcb_getport_async,
1732         .set_port               = xs_set_port,
1733         .connect                = xs_connect,
1734         .buf_alloc              = rpc_malloc,
1735         .buf_free               = rpc_free,
1736         .send_request           = xs_tcp_send_request,
1737         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
1738         .close                  = xs_close,
1739         .destroy                = xs_destroy,
1740         .print_stats            = xs_tcp_print_stats,
1741 };
1742
1743 static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size)
1744 {
1745         struct rpc_xprt *xprt;
1746         struct sock_xprt *new;
1747
1748         if (args->addrlen > sizeof(xprt->addr)) {
1749                 dprintk("RPC:       xs_setup_xprt: address too large\n");
1750                 return ERR_PTR(-EBADF);
1751         }
1752
1753         new = kzalloc(sizeof(*new), GFP_KERNEL);
1754         if (new == NULL) {
1755                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
1756                                 "rpc_xprt\n");
1757                 return ERR_PTR(-ENOMEM);
1758         }
1759         xprt = &new->xprt;
1760
1761         xprt->max_reqs = slot_table_size;
1762         xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1763         if (xprt->slot == NULL) {
1764                 kfree(xprt);
1765                 dprintk("RPC:       xs_setup_xprt: couldn't allocate slot "
1766                                 "table\n");
1767                 return ERR_PTR(-ENOMEM);
1768         }
1769
1770         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1771         xprt->addrlen = args->addrlen;
1772         if (args->srcaddr)
1773                 memcpy(&new->addr, args->srcaddr, args->addrlen);
1774         new->port = xs_get_random_port();
1775
1776         return xprt;
1777 }
1778
1779 /**
1780  * xs_setup_udp - Set up transport to use a UDP socket
1781  * @args: rpc transport creation arguments
1782  *
1783  */
1784 struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args)
1785 {
1786         struct sockaddr *addr = args->dstaddr;
1787         struct rpc_xprt *xprt;
1788         struct sock_xprt *transport;
1789
1790         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1791         if (IS_ERR(xprt))
1792                 return xprt;
1793         transport = container_of(xprt, struct sock_xprt, xprt);
1794
1795         xprt->prot = IPPROTO_UDP;
1796         xprt->tsh_size = 0;
1797         /* XXX: header size can vary due to auth type, IPv6, etc. */
1798         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1799
1800         xprt->bind_timeout = XS_BIND_TO;
1801         xprt->connect_timeout = XS_UDP_CONN_TO;
1802         xprt->reestablish_timeout = XS_UDP_REEST_TO;
1803         xprt->idle_timeout = XS_IDLE_DISC_TO;
1804
1805         xprt->ops = &xs_udp_ops;
1806
1807         if (args->timeout)
1808                 xprt->timeout = *args->timeout;
1809         else
1810                 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1811
1812         switch (addr->sa_family) {
1813         case AF_INET:
1814                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1815                         xprt_set_bound(xprt);
1816
1817                 INIT_DELAYED_WORK(&transport->connect_worker,
1818                                         xs_udp_connect_worker4);
1819                 xs_format_ipv4_peer_addresses(xprt);
1820                 break;
1821         case AF_INET6:
1822                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1823                         xprt_set_bound(xprt);
1824
1825                 INIT_DELAYED_WORK(&transport->connect_worker,
1826                                         xs_udp_connect_worker6);
1827                 xs_format_ipv6_peer_addresses(xprt);
1828                 break;
1829         default:
1830                 kfree(xprt);
1831                 return ERR_PTR(-EAFNOSUPPORT);
1832         }
1833
1834         dprintk("RPC:       set up transport to address %s\n",
1835                         xprt->address_strings[RPC_DISPLAY_ALL]);
1836
1837         return xprt;
1838 }
1839
1840 /**
1841  * xs_setup_tcp - Set up transport to use a TCP socket
1842  * @args: rpc transport creation arguments
1843  *
1844  */
1845 struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args)
1846 {
1847         struct sockaddr *addr = args->dstaddr;
1848         struct rpc_xprt *xprt;
1849         struct sock_xprt *transport;
1850
1851         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1852         if (IS_ERR(xprt))
1853                 return xprt;
1854         transport = container_of(xprt, struct sock_xprt, xprt);
1855
1856         xprt->prot = IPPROTO_TCP;
1857         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1858         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1859
1860         xprt->bind_timeout = XS_BIND_TO;
1861         xprt->connect_timeout = XS_TCP_CONN_TO;
1862         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1863         xprt->idle_timeout = XS_IDLE_DISC_TO;
1864
1865         xprt->ops = &xs_tcp_ops;
1866
1867         if (args->timeout)
1868                 xprt->timeout = *args->timeout;
1869         else
1870                 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1871
1872         switch (addr->sa_family) {
1873         case AF_INET:
1874                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
1875                         xprt_set_bound(xprt);
1876
1877                 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4);
1878                 xs_format_ipv4_peer_addresses(xprt);
1879                 break;
1880         case AF_INET6:
1881                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
1882                         xprt_set_bound(xprt);
1883
1884                 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6);
1885                 xs_format_ipv6_peer_addresses(xprt);
1886                 break;
1887         default:
1888                 kfree(xprt);
1889                 return ERR_PTR(-EAFNOSUPPORT);
1890         }
1891
1892         dprintk("RPC:       set up transport to address %s\n",
1893                         xprt->address_strings[RPC_DISPLAY_ALL]);
1894
1895         return xprt;
1896 }
1897
1898 /**
1899  * init_socket_xprt - set up xprtsock's sysctls
1900  *
1901  */
1902 int init_socket_xprt(void)
1903 {
1904 #ifdef RPC_DEBUG
1905         if (!sunrpc_table_header)
1906                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
1907 #endif
1908
1909         return 0;
1910 }
1911
1912 /**
1913  * cleanup_socket_xprt - remove xprtsock's sysctls
1914  *
1915  */
1916 void cleanup_socket_xprt(void)
1917 {
1918 #ifdef RPC_DEBUG
1919         if (sunrpc_table_header) {
1920                 unregister_sysctl_table(sunrpc_table_header);
1921                 sunrpc_table_header = NULL;
1922         }
1923 #endif
1924 }