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