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
   7  * TCP send fixes (C) 1998 Red Hat
   8  * TCP NFS related read + write fixes
   9  *  (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
  10  *
  11  * Rewrite of larges part of the code in order to stabilize TCP stuff.
  12  * Fix behaviour when socket buffer is full.
  13  *  (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
  14  *
  15  * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
  16  *
  17  * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
  18  *   <gilles.quillard@bull.net>
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <linux/capability.h>
  26 #include <linux/pagemap.h>
  27 #include <linux/errno.h>
  28 #include <linux/socket.h>
  29 #include <linux/in.h>
  30 #include <linux/net.h>
  31 #include <linux/mm.h>
  32 #include <linux/un.h>
  33 #include <linux/udp.h>
  34 #include <linux/tcp.h>
  35 #include <linux/sunrpc/clnt.h>
  36 #include <linux/sunrpc/addr.h>
  37 #include <linux/sunrpc/sched.h>
  38 #include <linux/sunrpc/svcsock.h>
  39 #include <linux/sunrpc/xprtsock.h>
  40 #include <linux/file.h>
  41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
  42 #include <linux/sunrpc/bc_xprt.h>
  43 #endif
  44
  45 #include <net/sock.h>
  46 #include <net/checksum.h>
  47 #include <net/udp.h>
  48 #include <net/tcp.h>
  49
  50 #include <trace/events/sunrpc.h>
  51
  52 #include "sunrpc.h"
  53
  54 static void xs_close(struct rpc_xprt *xprt);
  55
  56 /*
  57  * xprtsock tunables
  58  */
  59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
  61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
  62
  63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  65
  66 #define XS_TCP_LINGER_TO        (15U * HZ)
  67 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
  68
  69 /*
  70  * We can register our own files under /proc/sys/sunrpc by
  71  * calling register_sysctl_table() again.  The files in that
  72  * directory become the union of all files registered there.
  73  *
  74  * We simply need to make sure that we don't collide with
  75  * someone else's file names!
  76  */
  77
  78 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
  79
  80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
  83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  85
  86 static struct ctl_table_header *sunrpc_table_header;
  87
  88 /*
  89  * FIXME: changing the UDP slot table size should also resize the UDP
  90  *        socket buffers for existing UDP transports
  91  */
  92 static struct ctl_table xs_tunables_table[] = {
  93         {
  94                 .procname       = "udp_slot_table_entries",
  95                 .data           = &xprt_udp_slot_table_entries,
  96                 .maxlen         = sizeof(unsigned int),
  97                 .mode           = 0644,
  98                 .proc_handler   = proc_dointvec_minmax,
  99                 .extra1         = &min_slot_table_size,
 100                 .extra2         = &max_slot_table_size
 101         },
 102         {
 103                 .procname       = "tcp_slot_table_entries",
 104                 .data           = &xprt_tcp_slot_table_entries,
 105                 .maxlen         = sizeof(unsigned int),
 106                 .mode           = 0644,
 107                 .proc_handler   = proc_dointvec_minmax,
 108                 .extra1         = &min_slot_table_size,
 109                 .extra2         = &max_slot_table_size
 110         },
 111         {
 112                 .procname       = "tcp_max_slot_table_entries",
 113                 .data           = &xprt_max_tcp_slot_table_entries,
 114                 .maxlen         = sizeof(unsigned int),
 115                 .mode           = 0644,
 116                 .proc_handler   = proc_dointvec_minmax,
 117                 .extra1         = &min_slot_table_size,
 118                 .extra2         = &max_tcp_slot_table_limit
 119         },
 120         {
 121                 .procname       = "min_resvport",
 122                 .data           = &xprt_min_resvport,
 123                 .maxlen         = sizeof(unsigned int),
 124                 .mode           = 0644,
 125                 .proc_handler   = proc_dointvec_minmax,
 126                 .extra1         = &xprt_min_resvport_limit,
 127                 .extra2         = &xprt_max_resvport_limit
 128         },
 129         {
 130                 .procname       = "max_resvport",
 131                 .data           = &xprt_max_resvport,
 132                 .maxlen         = sizeof(unsigned int),
 133                 .mode           = 0644,
 134                 .proc_handler   = proc_dointvec_minmax,
 135                 .extra1         = &xprt_min_resvport_limit,
 136                 .extra2         = &xprt_max_resvport_limit
 137         },
 138         {
 139                 .procname       = "tcp_fin_timeout",
 140                 .data           = &xs_tcp_fin_timeout,
 141                 .maxlen         = sizeof(xs_tcp_fin_timeout),
 142                 .mode           = 0644,
 143                 .proc_handler   = proc_dointvec_jiffies,
 144         },
 145         { },
 146 };
 147
 148 static struct ctl_table sunrpc_table[] = {
 149         {
 150                 .procname       = "sunrpc",
 151                 .mode           = 0555,
 152                 .child          = xs_tunables_table
 153         },
 154         { },
 155 };
 156
 157 #endif
 158
 159 /*
 160  * Wait duration for a reply from the RPC portmapper.
 161  */
 162 #define XS_BIND_TO              (60U * HZ)
 163
 164 /*
 165  * Delay if a UDP socket connect error occurs.  This is most likely some
 166  * kind of resource problem on the local host.
 167  */
 168 #define XS_UDP_REEST_TO         (2U * HZ)
 169
 170 /*
 171  * The reestablish timeout allows clients to delay for a bit before attempting
 172  * to reconnect to a server that just dropped our connection.
 173  *
 174  * We implement an exponential backoff when trying to reestablish a TCP
 175  * transport connection with the server.  Some servers like to drop a TCP
 176  * connection when they are overworked, so we start with a short timeout and
 177  * increase over time if the server is down or not responding.
 178  */
 179 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
 180 #define XS_TCP_MAX_REEST_TO     (5U * 60 * HZ)
 181
 182 /*
 183  * TCP idle timeout; client drops the transport socket if it is idle
 184  * for this long.  Note that we also timeout UDP sockets to prevent
 185  * holding port numbers when there is no RPC traffic.
 186  */
 187 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 188
 189 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 190 # undef  RPC_DEBUG_DATA
 191 # define RPCDBG_FACILITY        RPCDBG_TRANS
 192 #endif
 193
 194 #ifdef RPC_DEBUG_DATA
 195 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 196 {
 197         u8 *buf = (u8 *) packet;
 198         int j;
 199
 200         dprintk("RPC:       %s\n", msg);
 201         for (j = 0; j < count && j < 128; j += 4) {
 202                 if (!(j & 31)) {
 203                         if (j)
 204                                 dprintk("\n");
 205                         dprintk("0x%04x ", j);
 206                 }
 207                 dprintk("%02x%02x%02x%02x ",
 208                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
 209         }
 210         dprintk("\n");
 211 }
 212 #else
 213 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 214 {
 215         /* NOP */
 216 }
 217 #endif
 218
 219 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 220 {
 221         return (struct rpc_xprt *) sk->sk_user_data;
 222 }
 223
 224 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 225 {
 226         return (struct sockaddr *) &xprt->addr;
 227 }
 228
 229 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
 230 {
 231         return (struct sockaddr_un *) &xprt->addr;
 232 }
 233
 234 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
 235 {
 236         return (struct sockaddr_in *) &xprt->addr;
 237 }
 238
 239 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
 240 {
 241         return (struct sockaddr_in6 *) &xprt->addr;
 242 }
 243
 244 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
 245 {
 246         struct sockaddr *sap = xs_addr(xprt);
 247         struct sockaddr_in6 *sin6;
 248         struct sockaddr_in *sin;
 249         struct sockaddr_un *sun;
 250         char buf[128];
 251
 252         switch (sap->sa_family) {
 253         case AF_LOCAL:
 254                 sun = xs_addr_un(xprt);
 255                 strlcpy(buf, sun->sun_path, sizeof(buf));
 256                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 257                                                 kstrdup(buf, GFP_KERNEL);
 258                 break;
 259         case AF_INET:
 260                 (void)rpc_ntop(sap, buf, sizeof(buf));
 261                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 262                                                 kstrdup(buf, GFP_KERNEL);
 263                 sin = xs_addr_in(xprt);
 264                 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
 265                 break;
 266         case AF_INET6:
 267                 (void)rpc_ntop(sap, buf, sizeof(buf));
 268                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 269                                                 kstrdup(buf, GFP_KERNEL);
 270                 sin6 = xs_addr_in6(xprt);
 271                 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
 272                 break;
 273         default:
 274                 BUG();
 275         }
 276
 277         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
 278 }
 279
 280 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
 281 {
 282         struct sockaddr *sap = xs_addr(xprt);
 283         char buf[128];
 284
 285         snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
 286         xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
 287
 288         snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
 289         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
 290 }
 291
 292 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
 293                                      const char *protocol,
 294                                      const char *netid)
 295 {
 296         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 297         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 298         xs_format_common_peer_addresses(xprt);
 299         xs_format_common_peer_ports(xprt);
 300 }
 301
 302 static void xs_update_peer_port(struct rpc_xprt *xprt)
 303 {
 304         kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
 305         kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
 306
 307         xs_format_common_peer_ports(xprt);
 308 }
 309
 310 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 311 {
 312         unsigned int i;
 313
 314         for (i = 0; i < RPC_DISPLAY_MAX; i++)
 315                 switch (i) {
 316                 case RPC_DISPLAY_PROTO:
 317                 case RPC_DISPLAY_NETID:
 318                         continue;
 319                 default:
 320                         kfree(xprt->address_strings[i]);
 321                 }
 322 }
 323
 324 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 325
 326 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
 327 {
 328         struct msghdr msg = {
 329                 .msg_name       = addr,
 330                 .msg_namelen    = addrlen,
 331                 .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
 332         };
 333         struct kvec iov = {
 334                 .iov_base       = vec->iov_base + base,
 335                 .iov_len        = vec->iov_len - base,
 336         };
 337
 338         if (iov.iov_len != 0)
 339                 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
 340         return kernel_sendmsg(sock, &msg, NULL, 0, 0);
 341 }
 342
 343 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
 344 {
 345         ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
 346                         int offset, size_t size, int flags);
 347         struct page **ppage;
 348         unsigned int remainder;
 349         int err;
 350
 351         remainder = xdr->page_len - base;
 352         base += xdr->page_base;
 353         ppage = xdr->pages + (base >> PAGE_SHIFT);
 354         base &= ~PAGE_MASK;
 355         do_sendpage = sock->ops->sendpage;
 356         if (!zerocopy)
 357                 do_sendpage = sock_no_sendpage;
 358         for(;;) {
 359                 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
 360                 int flags = XS_SENDMSG_FLAGS;
 361
 362                 remainder -= len;
 363                 if (remainder != 0 || more)
 364                         flags |= MSG_MORE;
 365                 err = do_sendpage(sock, *ppage, base, len, flags);
 366                 if (remainder == 0 || err != len)
 367                         break;
 368                 *sent_p += err;
 369                 ppage++;
 370                 base = 0;
 371         }
 372         if (err > 0) {
 373                 *sent_p += err;
 374                 err = 0;
 375         }
 376         return err;
 377 }
 378
 379 /**
 380  * xs_sendpages - write pages directly to a socket
 381  * @sock: socket to send on
 382  * @addr: UDP only -- address of destination
 383  * @addrlen: UDP only -- length of destination address
 384  * @xdr: buffer containing this request
 385  * @base: starting position in the buffer
 386  * @zerocopy: true if it is safe to use sendpage()
 387  * @sent_p: return the total number of bytes successfully queued for sending
 388  *
 389  */
 390 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
 391 {
 392         unsigned int remainder = xdr->len - base;
 393         int err = 0;
 394         int sent = 0;
 395
 396         if (unlikely(!sock))
 397                 return -ENOTSOCK;
 398
 399         clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
 400         if (base != 0) {
 401                 addr = NULL;
 402                 addrlen = 0;
 403         }
 404
 405         if (base < xdr->head[0].iov_len || addr != NULL) {
 406                 unsigned int len = xdr->head[0].iov_len - base;
 407                 remainder -= len;
 408                 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
 409                 if (remainder == 0 || err != len)
 410                         goto out;
 411                 *sent_p += err;
 412                 base = 0;
 413         } else
 414                 base -= xdr->head[0].iov_len;
 415
 416         if (base < xdr->page_len) {
 417                 unsigned int len = xdr->page_len - base;
 418                 remainder -= len;
 419                 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
 420                 *sent_p += sent;
 421                 if (remainder == 0 || sent != len)
 422                         goto out;
 423                 base = 0;
 424         } else
 425                 base -= xdr->page_len;
 426
 427         if (base >= xdr->tail[0].iov_len)
 428                 return 0;
 429         err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
 430 out:
 431         if (err > 0) {
 432                 *sent_p += err;
 433                 err = 0;
 434         }
 435         return err;
 436 }
 437
 438 static void xs_nospace_callback(struct rpc_task *task)
 439 {
 440         struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
 441
 442         transport->inet->sk_write_pending--;
 443         clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 444 }
 445
 446 /**
 447  * xs_nospace - place task on wait queue if transmit was incomplete
 448  * @task: task to put to sleep
 449  *
 450  */
 451 static int xs_nospace(struct rpc_task *task)
 452 {
 453         struct rpc_rqst *req = task->tk_rqstp;
 454         struct rpc_xprt *xprt = req->rq_xprt;
 455         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 456         struct sock *sk = transport->inet;
 457         int ret = -EAGAIN;
 458
 459         dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
 460                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
 461                         req->rq_slen);
 462
 463         /* Protect against races with write_space */
 464         spin_lock_bh(&xprt->transport_lock);
 465
 466         /* Don't race with disconnect */
 467         if (xprt_connected(xprt)) {
 468                 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
 469                         /*
 470                          * Notify TCP that we're limited by the application
 471                          * window size
 472                          */
 473                         set_bit(SOCK_NOSPACE, &transport->sock->flags);
 474                         sk->sk_write_pending++;
 475                         /* ...and wait for more buffer space */
 476                         xprt_wait_for_buffer_space(task, xs_nospace_callback);
 477                 }
 478         } else {
 479                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 480                 ret = -ENOTCONN;
 481         }
 482
 483         spin_unlock_bh(&xprt->transport_lock);
 484
 485         /* Race breaker in case memory is freed before above code is called */
 486         sk->sk_write_space(sk);
 487         return ret;
 488 }
 489
 490 /*
 491  * Construct a stream transport record marker in @buf.
 492  */
 493 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
 494 {
 495         u32 reclen = buf->len - sizeof(rpc_fraghdr);
 496         rpc_fraghdr *base = buf->head[0].iov_base;
 497         *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
 498 }
 499
 500 /**
 501  * xs_local_send_request - write an RPC request to an AF_LOCAL socket
 502  * @task: RPC task that manages the state of an RPC request
 503  *
 504  * Return values:
 505  *        0:    The request has been sent
 506  *   EAGAIN:    The socket was blocked, please call again later to
 507  *              complete the request
 508  * ENOTCONN:    Caller needs to invoke connect logic then call again
 509  *    other:    Some other error occured, the request was not sent
 510  */
 511 static int xs_local_send_request(struct rpc_task *task)
 512 {
 513         struct rpc_rqst *req = task->tk_rqstp;
 514         struct rpc_xprt *xprt = req->rq_xprt;
 515         struct sock_xprt *transport =
 516                                 container_of(xprt, struct sock_xprt, xprt);
 517         struct xdr_buf *xdr = &req->rq_snd_buf;
 518         int status;
 519         int sent = 0;
 520
 521         xs_encode_stream_record_marker(&req->rq_snd_buf);
 522
 523         xs_pktdump("packet data:",
 524                         req->rq_svec->iov_base, req->rq_svec->iov_len);
 525
 526         status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
 527                               true, &sent);
 528         dprintk("RPC:       %s(%u) = %d\n",
 529                         __func__, xdr->len - req->rq_bytes_sent, status);
 530         if (likely(sent > 0) || status == 0) {
 531                 req->rq_bytes_sent += sent;
 532                 req->rq_xmit_bytes_sent += sent;
 533                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
 534                         req->rq_bytes_sent = 0;
 535                         return 0;
 536                 }
 537                 status = -EAGAIN;
 538         }
 539
 540         switch (status) {
 541         case -ENOBUFS:
 542         case -EAGAIN:
 543                 status = xs_nospace(task);
 544                 break;
 545         default:
 546                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 547                         -status);
 548         case -EPIPE:
 549                 xs_close(xprt);
 550                 status = -ENOTCONN;
 551         }
 552
 553         return status;
 554 }
 555
 556 /**
 557  * xs_udp_send_request - write an RPC request to a UDP socket
 558  * @task: address of RPC task that manages the state of an RPC request
 559  *
 560  * Return values:
 561  *        0:    The request has been sent
 562  *   EAGAIN:    The socket was blocked, please call again later to
 563  *              complete the request
 564  * ENOTCONN:    Caller needs to invoke connect logic then call again
 565  *    other:    Some other error occurred, the request was not sent
 566  */
 567 static int xs_udp_send_request(struct rpc_task *task)
 568 {
 569         struct rpc_rqst *req = task->tk_rqstp;
 570         struct rpc_xprt *xprt = req->rq_xprt;
 571         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 572         struct xdr_buf *xdr = &req->rq_snd_buf;
 573         int sent = 0;
 574         int status;
 575
 576         xs_pktdump("packet data:",
 577                                 req->rq_svec->iov_base,
 578                                 req->rq_svec->iov_len);
 579
 580         if (!xprt_bound(xprt))
 581                 return -ENOTCONN;
 582         status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
 583                               xdr, req->rq_bytes_sent, true, &sent);
 584
 585         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 586                         xdr->len - req->rq_bytes_sent, status);
 587
 588         /* firewall is blocking us, don't return -EAGAIN or we end up looping */
 589         if (status == -EPERM)
 590                 goto process_status;
 591
 592         if (sent > 0 || status == 0) {
 593                 req->rq_xmit_bytes_sent += sent;
 594                 if (sent >= req->rq_slen)
 595                         return 0;
 596                 /* Still some bytes left; set up for a retry later. */
 597                 status = -EAGAIN;
 598         }
 599
 600 process_status:
 601         switch (status) {
 602         case -ENOTSOCK:
 603                 status = -ENOTCONN;
 604                 /* Should we call xs_close() here? */
 605                 break;
 606         case -EAGAIN:
 607                 status = xs_nospace(task);
 608                 break;
 609         default:
 610                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 611                         -status);
 612         case -ENETUNREACH:
 613         case -ENOBUFS:
 614         case -EPIPE:
 615         case -ECONNREFUSED:
 616         case -EPERM:
 617                 /* When the server has died, an ICMP port unreachable message
 618                  * prompts ECONNREFUSED. */
 619                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 620         }
 621
 622         return status;
 623 }
 624
 625 /**
 626  * xs_tcp_shutdown - gracefully shut down a TCP socket
 627  * @xprt: transport
 628  *
 629  * Initiates a graceful shutdown of the TCP socket by calling the
 630  * equivalent of shutdown(SHUT_WR);
 631  */
 632 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
 633 {
 634         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 635         struct socket *sock = transport->sock;
 636
 637         if (sock != NULL) {
 638                 kernel_sock_shutdown(sock, SHUT_WR);
 639                 trace_rpc_socket_shutdown(xprt, sock);
 640         }
 641 }
 642
 643 /**
 644  * xs_tcp_send_request - write an RPC request to a TCP socket
 645  * @task: address of RPC task that manages the state of an RPC request
 646  *
 647  * Return values:
 648  *        0:    The request has been sent
 649  *   EAGAIN:    The socket was blocked, please call again later to
 650  *              complete the request
 651  * ENOTCONN:    Caller needs to invoke connect logic then call again
 652  *    other:    Some other error occurred, the request was not sent
 653  *
 654  * XXX: In the case of soft timeouts, should we eventually give up
 655  *      if sendmsg is not able to make progress?
 656  */
 657 static int xs_tcp_send_request(struct rpc_task *task)
 658 {
 659         struct rpc_rqst *req = task->tk_rqstp;
 660         struct rpc_xprt *xprt = req->rq_xprt;
 661         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 662         struct xdr_buf *xdr = &req->rq_snd_buf;
 663         bool zerocopy = true;
 664         int status;
 665         int sent;
 666
 667         xs_encode_stream_record_marker(&req->rq_snd_buf);
 668
 669         xs_pktdump("packet data:",
 670                                 req->rq_svec->iov_base,
 671                                 req->rq_svec->iov_len);
 672         /* Don't use zero copy if this is a resend. If the RPC call
 673          * completes while the socket holds a reference to the pages,
 674          * then we may end up resending corrupted data.
 675          */
 676         if (task->tk_flags & RPC_TASK_SENT)
 677                 zerocopy = false;
 678
 679         /* Continue transmitting the packet/record. We must be careful
 680          * to cope with writespace callbacks arriving _after_ we have
 681          * called sendmsg(). */
 682         while (1) {
 683                 sent = 0;
 684                 status = xs_sendpages(transport->sock, NULL, 0, xdr,
 685                                       req->rq_bytes_sent, zerocopy, &sent);
 686
 687                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
 688                                 xdr->len - req->rq_bytes_sent, status);
 689
 690                 if (unlikely(sent == 0 && status < 0))
 691                         break;
 692
 693                 /* If we've sent the entire packet, immediately
 694                  * reset the count of bytes sent. */
 695                 req->rq_bytes_sent += sent;
 696                 req->rq_xmit_bytes_sent += sent;
 697                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
 698                         req->rq_bytes_sent = 0;
 699                         return 0;
 700                 }
 701
 702                 if (sent != 0)
 703                         continue;
 704                 status = -EAGAIN;
 705                 break;
 706         }
 707
 708         switch (status) {
 709         case -ENOTSOCK:
 710                 status = -ENOTCONN;
 711                 /* Should we call xs_close() here? */
 712                 break;
 713         case -ENOBUFS:
 714         case -EAGAIN:
 715                 status = xs_nospace(task);
 716                 break;
 717         default:
 718                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 719                         -status);
 720         case -ECONNRESET:
 721                 xs_tcp_shutdown(xprt);
 722         case -ECONNREFUSED:
 723         case -ENOTCONN:
 724         case -EADDRINUSE:
 725         case -EPIPE:
 726                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 727         }
 728
 729         return status;
 730 }
 731
 732 /**
 733  * xs_tcp_release_xprt - clean up after a tcp transmission
 734  * @xprt: transport
 735  * @task: rpc task
 736  *
 737  * This cleans up if an error causes us to abort the transmission of a request.
 738  * In this case, the socket may need to be reset in order to avoid confusing
 739  * the server.
 740  */
 741 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
 742 {
 743         struct rpc_rqst *req;
 744
 745         if (task != xprt->snd_task)
 746                 return;
 747         if (task == NULL)
 748                 goto out_release;
 749         req = task->tk_rqstp;
 750         if (req == NULL)
 751                 goto out_release;
 752         if (req->rq_bytes_sent == 0)
 753                 goto out_release;
 754         if (req->rq_bytes_sent == req->rq_snd_buf.len)
 755                 goto out_release;
 756         set_bit(XPRT_CLOSE_WAIT, &xprt->state);
 757 out_release:
 758         xprt_release_xprt(xprt, task);
 759 }
 760
 761 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
 762 {
 763         transport->old_data_ready = sk->sk_data_ready;
 764         transport->old_state_change = sk->sk_state_change;
 765         transport->old_write_space = sk->sk_write_space;
 766         transport->old_error_report = sk->sk_error_report;
 767 }
 768
 769 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
 770 {
 771         sk->sk_data_ready = transport->old_data_ready;
 772         sk->sk_state_change = transport->old_state_change;
 773         sk->sk_write_space = transport->old_write_space;
 774         sk->sk_error_report = transport->old_error_report;
 775 }
 776
 777 /**
 778  * xs_error_report - callback to handle TCP socket state errors
 779  * @sk: socket
 780  *
 781  * Note: we don't call sock_error() since there may be a rpc_task
 782  * using the socket, and so we don't want to clear sk->sk_err.
 783  */
 784 static void xs_error_report(struct sock *sk)
 785 {
 786         struct rpc_xprt *xprt;
 787         int err;
 788
 789         read_lock_bh(&sk->sk_callback_lock);
 790         if (!(xprt = xprt_from_sock(sk)))
 791                 goto out;
 792
 793         err = -sk->sk_err;
 794         if (err == 0)
 795                 goto out;
 796         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
 797                         xprt, -err);
 798         trace_rpc_socket_error(xprt, sk->sk_socket, err);
 799         if (test_bit(XPRT_CONNECTION_REUSE, &xprt->state))
 800                 goto out;
 801         xprt_wake_pending_tasks(xprt, err);
 802  out:
 803         read_unlock_bh(&sk->sk_callback_lock);
 804 }
 805
 806 static void xs_reset_transport(struct sock_xprt *transport)
 807 {
 808         struct socket *sock = transport->sock;
 809         struct sock *sk = transport->inet;
 810
 811         if (sk == NULL)
 812                 return;
 813
 814         transport->srcport = 0;
 815
 816         write_lock_bh(&sk->sk_callback_lock);
 817         transport->inet = NULL;
 818         transport->sock = NULL;
 819
 820         sk->sk_user_data = NULL;
 821
 822         xs_restore_old_callbacks(transport, sk);
 823         write_unlock_bh(&sk->sk_callback_lock);
 824
 825         trace_rpc_socket_close(&transport->xprt, sock);
 826         sock_release(sock);
 827 }
 828
 829 /**
 830  * xs_close - close a socket
 831  * @xprt: transport
 832  *
 833  * This is used when all requests are complete; ie, no DRC state remains
 834  * on the server we want to save.
 835  *
 836  * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
 837  * xs_reset_transport() zeroing the socket from underneath a writer.
 838  */
 839 static void xs_close(struct rpc_xprt *xprt)
 840 {
 841         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 842
 843         dprintk("RPC:       xs_close xprt %p\n", xprt);
 844
 845         cancel_delayed_work_sync(&transport->connect_worker);
 846
 847         xs_reset_transport(transport);
 848         xprt->reestablish_timeout = 0;
 849
 850         smp_mb__before_atomic();
 851         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
 852         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
 853         clear_bit(XPRT_CLOSING, &xprt->state);
 854         smp_mb__after_atomic();
 855         xprt_disconnect_done(xprt);
 856 }
 857
 858 static void xs_tcp_close(struct rpc_xprt *xprt)
 859 {
 860         if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
 861                 xs_close(xprt);
 862         else
 863                 xs_tcp_shutdown(xprt);
 864 }
 865
 866 static void xs_xprt_free(struct rpc_xprt *xprt)
 867 {
 868         xs_free_peer_addresses(xprt);
 869         xprt_free(xprt);
 870 }
 871
 872 /**
 873  * xs_destroy - prepare to shutdown a transport
 874  * @xprt: doomed transport
 875  *
 876  */
 877 static void xs_destroy(struct rpc_xprt *xprt)
 878 {
 879         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
 880
 881         xs_close(xprt);
 882         xs_xprt_free(xprt);
 883         module_put(THIS_MODULE);
 884 }
 885
 886 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
 887 {
 888         struct xdr_skb_reader desc = {
 889                 .skb            = skb,
 890                 .offset         = sizeof(rpc_fraghdr),
 891                 .count          = skb->len - sizeof(rpc_fraghdr),
 892         };
 893
 894         if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
 895                 return -1;
 896         if (desc.count)
 897                 return -1;
 898         return 0;
 899 }
 900
 901 /**
 902  * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
 903  * @sk: socket with data to read
 904  * @len: how much data to read
 905  *
 906  * Currently this assumes we can read the whole reply in a single gulp.
 907  */
 908 static void xs_local_data_ready(struct sock *sk)
 909 {
 910         struct rpc_task *task;
 911         struct rpc_xprt *xprt;
 912         struct rpc_rqst *rovr;
 913         struct sk_buff *skb;
 914         int err, repsize, copied;
 915         u32 _xid;
 916         __be32 *xp;
 917
 918         read_lock_bh(&sk->sk_callback_lock);
 919         dprintk("RPC:       %s...\n", __func__);
 920         xprt = xprt_from_sock(sk);
 921         if (xprt == NULL)
 922                 goto out;
 923
 924         skb = skb_recv_datagram(sk, 0, 1, &err);
 925         if (skb == NULL)
 926                 goto out;
 927
 928         repsize = skb->len - sizeof(rpc_fraghdr);
 929         if (repsize < 4) {
 930                 dprintk("RPC:       impossible RPC reply size %d\n", repsize);
 931                 goto dropit;
 932         }
 933
 934         /* Copy the XID from the skb... */
 935         xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
 936         if (xp == NULL)
 937                 goto dropit;
 938
 939         /* Look up and lock the request corresponding to the given XID */
 940         spin_lock(&xprt->transport_lock);
 941         rovr = xprt_lookup_rqst(xprt, *xp);
 942         if (!rovr)
 943                 goto out_unlock;
 944         task = rovr->rq_task;
 945
 946         copied = rovr->rq_private_buf.buflen;
 947         if (copied > repsize)
 948                 copied = repsize;
 949
 950         if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
 951                 dprintk("RPC:       sk_buff copy failed\n");
 952                 goto out_unlock;
 953         }
 954
 955         xprt_complete_rqst(task, copied);
 956
 957  out_unlock:
 958         spin_unlock(&xprt->transport_lock);
 959  dropit:
 960         skb_free_datagram(sk, skb);
 961  out:
 962         read_unlock_bh(&sk->sk_callback_lock);
 963 }
 964
 965 /**
 966  * xs_udp_data_ready - "data ready" callback for UDP sockets
 967  * @sk: socket with data to read
 968  * @len: how much data to read
 969  *
 970  */
 971 static void xs_udp_data_ready(struct sock *sk)
 972 {
 973         struct rpc_task *task;
 974         struct rpc_xprt *xprt;
 975         struct rpc_rqst *rovr;
 976         struct sk_buff *skb;
 977         int err, repsize, copied;
 978         u32 _xid;
 979         __be32 *xp;
 980
 981         read_lock_bh(&sk->sk_callback_lock);
 982         dprintk("RPC:       xs_udp_data_ready...\n");
 983         if (!(xprt = xprt_from_sock(sk)))
 984                 goto out;
 985
 986         if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
 987                 goto out;
 988
 989         repsize = skb->len - sizeof(struct udphdr);
 990         if (repsize < 4) {
 991                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
 992                 goto dropit;
 993         }
 994
 995         /* Copy the XID from the skb... */
 996         xp = skb_header_pointer(skb, sizeof(struct udphdr),
 997                                 sizeof(_xid), &_xid);
 998         if (xp == NULL)
 999                 goto dropit;
1000
1001         /* Look up and lock the request corresponding to the given XID */
1002         spin_lock(&xprt->transport_lock);
1003         rovr = xprt_lookup_rqst(xprt, *xp);
1004         if (!rovr)
1005                 goto out_unlock;
1006         task = rovr->rq_task;
1007
1008         if ((copied = rovr->rq_private_buf.buflen) > repsize)
1009                 copied = repsize;
1010
1011         /* Suck it into the iovec, verify checksum if not done by hw. */
1012         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1013                 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1014                 goto out_unlock;
1015         }
1016
1017         UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1018
1019         xprt_adjust_cwnd(xprt, task, copied);
1020         xprt_complete_rqst(task, copied);
1021
1022  out_unlock:
1023         spin_unlock(&xprt->transport_lock);
1024  dropit:
1025         skb_free_datagram(sk, skb);
1026  out:
1027         read_unlock_bh(&sk->sk_callback_lock);
1028 }
1029
1030 /*
1031  * Helper function to force a TCP close if the server is sending
1032  * junk and/or it has put us in CLOSE_WAIT
1033  */
1034 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1035 {
1036         set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1037         xprt_force_disconnect(xprt);
1038 }
1039
1040 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1041 {
1042         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1043         size_t len, used;
1044         char *p;
1045
1046         p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1047         len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1048         used = xdr_skb_read_bits(desc, p, len);
1049         transport->tcp_offset += used;
1050         if (used != len)
1051                 return;
1052
1053         transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1054         if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1055                 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1056         else
1057                 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1058         transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1059
1060         transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1061         transport->tcp_offset = 0;
1062
1063         /* Sanity check of the record length */
1064         if (unlikely(transport->tcp_reclen < 8)) {
1065                 dprintk("RPC:       invalid TCP record fragment length\n");
1066                 xs_tcp_force_close(xprt);
1067                 return;
1068         }
1069         dprintk("RPC:       reading TCP record fragment of length %d\n",
1070                         transport->tcp_reclen);
1071 }
1072
1073 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1074 {
1075         if (transport->tcp_offset == transport->tcp_reclen) {
1076                 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1077                 transport->tcp_offset = 0;
1078                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1079                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1080                         transport->tcp_flags |= TCP_RCV_COPY_XID;
1081                         transport->tcp_copied = 0;
1082                 }
1083         }
1084 }
1085
1086 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1087 {
1088         size_t len, used;
1089         char *p;
1090
1091         len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1092         dprintk("RPC:       reading XID (%Zu bytes)\n", len);
1093         p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1094         used = xdr_skb_read_bits(desc, p, len);
1095         transport->tcp_offset += used;
1096         if (used != len)
1097                 return;
1098         transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1099         transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1100         transport->tcp_copied = 4;
1101         dprintk("RPC:       reading %s XID %08x\n",
1102                         (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1103                                                               : "request with",
1104                         ntohl(transport->tcp_xid));
1105         xs_tcp_check_fraghdr(transport);
1106 }
1107
1108 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1109                                        struct xdr_skb_reader *desc)
1110 {
1111         size_t len, used;
1112         u32 offset;
1113         char *p;
1114
1115         /*
1116          * We want transport->tcp_offset to be 8 at the end of this routine
1117          * (4 bytes for the xid and 4 bytes for the call/reply flag).
1118          * When this function is called for the first time,
1119          * transport->tcp_offset is 4 (after having already read the xid).
1120          */
1121         offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1122         len = sizeof(transport->tcp_calldir) - offset;
1123         dprintk("RPC:       reading CALL/REPLY flag (%Zu bytes)\n", len);
1124         p = ((char *) &transport->tcp_calldir) + offset;
1125         used = xdr_skb_read_bits(desc, p, len);
1126         transport->tcp_offset += used;
1127         if (used != len)
1128                 return;
1129         transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1130         /*
1131          * We don't yet have the XDR buffer, so we will write the calldir
1132          * out after we get the buffer from the 'struct rpc_rqst'
1133          */
1134         switch (ntohl(transport->tcp_calldir)) {
1135         case RPC_REPLY:
1136                 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1137                 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1138                 transport->tcp_flags |= TCP_RPC_REPLY;
1139                 break;
1140         case RPC_CALL:
1141                 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1142                 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1143                 transport->tcp_flags &= ~TCP_RPC_REPLY;
1144                 break;
1145         default:
1146                 dprintk("RPC:       invalid request message type\n");
1147                 xs_tcp_force_close(&transport->xprt);
1148         }
1149         xs_tcp_check_fraghdr(transport);
1150 }
1151
1152 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1153                                      struct xdr_skb_reader *desc,
1154                                      struct rpc_rqst *req)
1155 {
1156         struct sock_xprt *transport =
1157                                 container_of(xprt, struct sock_xprt, xprt);
1158         struct xdr_buf *rcvbuf;
1159         size_t len;
1160         ssize_t r;
1161
1162         rcvbuf = &req->rq_private_buf;
1163
1164         if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1165                 /*
1166                  * Save the RPC direction in the XDR buffer
1167                  */
1168                 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1169                         &transport->tcp_calldir,
1170                         sizeof(transport->tcp_calldir));
1171                 transport->tcp_copied += sizeof(transport->tcp_calldir);
1172                 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1173         }
1174
1175         len = desc->count;
1176         if (len > transport->tcp_reclen - transport->tcp_offset) {
1177                 struct xdr_skb_reader my_desc;
1178
1179                 len = transport->tcp_reclen - transport->tcp_offset;
1180                 memcpy(&my_desc, desc, sizeof(my_desc));
1181                 my_desc.count = len;
1182                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1183                                           &my_desc, xdr_skb_read_bits);
1184                 desc->count -= r;
1185                 desc->offset += r;
1186         } else
1187                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1188                                           desc, xdr_skb_read_bits);
1189
1190         if (r > 0) {
1191                 transport->tcp_copied += r;
1192                 transport->tcp_offset += r;
1193         }
1194         if (r != len) {
1195                 /* Error when copying to the receive buffer,
1196                  * usually because we weren't able to allocate
1197                  * additional buffer pages. All we can do now
1198                  * is turn off TCP_RCV_COPY_DATA, so the request
1199                  * will not receive any additional updates,
1200                  * and time out.
1201                  * Any remaining data from this record will
1202                  * be discarded.
1203                  */
1204                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1205                 dprintk("RPC:       XID %08x truncated request\n",
1206                                 ntohl(transport->tcp_xid));
1207                 dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
1208                                 "tcp_offset = %u, tcp_reclen = %u\n",
1209                                 xprt, transport->tcp_copied,
1210                                 transport->tcp_offset, transport->tcp_reclen);
1211                 return;
1212         }
1213
1214         dprintk("RPC:       XID %08x read %Zd bytes\n",
1215                         ntohl(transport->tcp_xid), r);
1216         dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1217                         "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1218                         transport->tcp_offset, transport->tcp_reclen);
1219
1220         if (transport->tcp_copied == req->rq_private_buf.buflen)
1221                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1222         else if (transport->tcp_offset == transport->tcp_reclen) {
1223                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1224                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1225         }
1226 }
1227
1228 /*
1229  * Finds the request corresponding to the RPC xid and invokes the common
1230  * tcp read code to read the data.
1231  */
1232 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1233                                     struct xdr_skb_reader *desc)
1234 {
1235         struct sock_xprt *transport =
1236                                 container_of(xprt, struct sock_xprt, xprt);
1237         struct rpc_rqst *req;
1238
1239         dprintk("RPC:       read reply XID %08x\n", ntohl(transport->tcp_xid));
1240
1241         /* Find and lock the request corresponding to this xid */
1242         spin_lock(&xprt->transport_lock);
1243         req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1244         if (!req) {
1245                 dprintk("RPC:       XID %08x request not found!\n",
1246                                 ntohl(transport->tcp_xid));
1247                 spin_unlock(&xprt->transport_lock);
1248                 return -1;
1249         }
1250
1251         xs_tcp_read_common(xprt, desc, req);
1252
1253         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1254                 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1255
1256         spin_unlock(&xprt->transport_lock);
1257         return 0;
1258 }
1259
1260 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1261 /*
1262  * Obtains an rpc_rqst previously allocated and invokes the common
1263  * tcp read code to read the data.  The result is placed in the callback
1264  * queue.
1265  * If we're unable to obtain the rpc_rqst we schedule the closing of the
1266  * connection and return -1.
1267  */
1268 static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1269                                        struct xdr_skb_reader *desc)
1270 {
1271         struct sock_xprt *transport =
1272                                 container_of(xprt, struct sock_xprt, xprt);
1273         struct rpc_rqst *req;
1274
1275         /* Look up and lock the request corresponding to the given XID */
1276         spin_lock(&xprt->transport_lock);
1277         req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1278         if (req == NULL) {
1279                 spin_unlock(&xprt->transport_lock);
1280                 printk(KERN_WARNING "Callback slot table overflowed\n");
1281                 xprt_force_disconnect(xprt);
1282                 return -1;
1283         }
1284
1285         dprintk("RPC:       read callback  XID %08x\n", ntohl(req->rq_xid));
1286         xs_tcp_read_common(xprt, desc, req);
1287
1288         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1289                 xprt_complete_bc_request(req, transport->tcp_copied);
1290         spin_unlock(&xprt->transport_lock);
1291
1292         return 0;
1293 }
1294
1295 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1296                                         struct xdr_skb_reader *desc)
1297 {
1298         struct sock_xprt *transport =
1299                                 container_of(xprt, struct sock_xprt, xprt);
1300
1301         return (transport->tcp_flags & TCP_RPC_REPLY) ?
1302                 xs_tcp_read_reply(xprt, desc) :
1303                 xs_tcp_read_callback(xprt, desc);
1304 }
1305 #else
1306 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1307                                         struct xdr_skb_reader *desc)
1308 {
1309         return xs_tcp_read_reply(xprt, desc);
1310 }
1311 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1312
1313 /*
1314  * Read data off the transport.  This can be either an RPC_CALL or an
1315  * RPC_REPLY.  Relay the processing to helper functions.
1316  */
1317 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1318                                     struct xdr_skb_reader *desc)
1319 {
1320         struct sock_xprt *transport =
1321                                 container_of(xprt, struct sock_xprt, xprt);
1322
1323         if (_xs_tcp_read_data(xprt, desc) == 0)
1324                 xs_tcp_check_fraghdr(transport);
1325         else {
1326                 /*
1327                  * The transport_lock protects the request handling.
1328                  * There's no need to hold it to update the tcp_flags.
1329                  */
1330                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1331         }
1332 }
1333
1334 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1335 {
1336         size_t len;
1337
1338         len = transport->tcp_reclen - transport->tcp_offset;
1339         if (len > desc->count)
1340                 len = desc->count;
1341         desc->count -= len;
1342         desc->offset += len;
1343         transport->tcp_offset += len;
1344         dprintk("RPC:       discarded %Zu bytes\n", len);
1345         xs_tcp_check_fraghdr(transport);
1346 }
1347
1348 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1349 {
1350         struct rpc_xprt *xprt = rd_desc->arg.data;
1351         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1352         struct xdr_skb_reader desc = {
1353                 .skb    = skb,
1354                 .offset = offset,
1355                 .count  = len,
1356         };
1357
1358         dprintk("RPC:       xs_tcp_data_recv started\n");
1359         do {
1360                 trace_xs_tcp_data_recv(transport);
1361                 /* Read in a new fragment marker if necessary */
1362                 /* Can we ever really expect to get completely empty fragments? */
1363                 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1364                         xs_tcp_read_fraghdr(xprt, &desc);
1365                         continue;
1366                 }
1367                 /* Read in the xid if necessary */
1368                 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1369                         xs_tcp_read_xid(transport, &desc);
1370                         continue;
1371                 }
1372                 /* Read in the call/reply flag */
1373                 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1374                         xs_tcp_read_calldir(transport, &desc);
1375                         continue;
1376                 }
1377                 /* Read in the request data */
1378                 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1379                         xs_tcp_read_data(xprt, &desc);
1380                         continue;
1381                 }
1382                 /* Skip over any trailing bytes on short reads */
1383                 xs_tcp_read_discard(transport, &desc);
1384         } while (desc.count);
1385         trace_xs_tcp_data_recv(transport);
1386         dprintk("RPC:       xs_tcp_data_recv done\n");
1387         return len - desc.count;
1388 }
1389
1390 /**
1391  * xs_tcp_data_ready - "data ready" callback for TCP sockets
1392  * @sk: socket with data to read
1393  * @bytes: how much data to read
1394  *
1395  */
1396 static void xs_tcp_data_ready(struct sock *sk)
1397 {
1398         struct rpc_xprt *xprt;
1399         read_descriptor_t rd_desc;
1400         int read;
1401         unsigned long total = 0;
1402
1403         dprintk("RPC:       xs_tcp_data_ready...\n");
1404
1405         read_lock_bh(&sk->sk_callback_lock);
1406         if (!(xprt = xprt_from_sock(sk))) {
1407                 read = 0;
1408                 goto out;
1409         }
1410         /* Any data means we had a useful conversation, so
1411          * the we don't need to delay the next reconnect
1412          */
1413         if (xprt->reestablish_timeout)
1414                 xprt->reestablish_timeout = 0;
1415
1416         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1417         rd_desc.arg.data = xprt;
1418         do {
1419                 rd_desc.count = 65536;
1420                 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1421                 if (read > 0)
1422                         total += read;
1423         } while (read > 0);
1424 out:
1425         trace_xs_tcp_data_ready(xprt, read, total);
1426         read_unlock_bh(&sk->sk_callback_lock);
1427 }
1428
1429 /*
1430  * Do the equivalent of linger/linger2 handling for dealing with
1431  * broken servers that don't close the socket in a timely
1432  * fashion
1433  */
1434 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1435                 unsigned long timeout)
1436 {
1437         struct sock_xprt *transport;
1438
1439         if (xprt_test_and_set_connecting(xprt))
1440                 return;
1441         set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1442         transport = container_of(xprt, struct sock_xprt, xprt);
1443         queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1444                            timeout);
1445 }
1446
1447 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1448 {
1449         struct sock_xprt *transport;
1450
1451         transport = container_of(xprt, struct sock_xprt, xprt);
1452
1453         if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1454             !cancel_delayed_work(&transport->connect_worker))
1455                 return;
1456         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1457         xprt_clear_connecting(xprt);
1458 }
1459
1460 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1461 {
1462         smp_mb__before_atomic();
1463         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1464         clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1465         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1466         clear_bit(XPRT_CLOSING, &xprt->state);
1467         smp_mb__after_atomic();
1468 }
1469
1470 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1471 {
1472         xs_sock_reset_connection_flags(xprt);
1473         /* Mark transport as closed and wake up all pending tasks */
1474         xprt_disconnect_done(xprt);
1475 }
1476
1477 /**
1478  * xs_tcp_state_change - callback to handle TCP socket state changes
1479  * @sk: socket whose state has changed
1480  *
1481  */
1482 static void xs_tcp_state_change(struct sock *sk)
1483 {
1484         struct rpc_xprt *xprt;
1485
1486         read_lock_bh(&sk->sk_callback_lock);
1487         if (!(xprt = xprt_from_sock(sk)))
1488                 goto out;
1489         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1490         dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1491                         sk->sk_state, xprt_connected(xprt),
1492                         sock_flag(sk, SOCK_DEAD),
1493                         sock_flag(sk, SOCK_ZAPPED),
1494                         sk->sk_shutdown);
1495
1496         trace_rpc_socket_state_change(xprt, sk->sk_socket);
1497         switch (sk->sk_state) {
1498         case TCP_ESTABLISHED:
1499                 spin_lock(&xprt->transport_lock);
1500                 if (!xprt_test_and_set_connected(xprt)) {
1501                         struct sock_xprt *transport = container_of(xprt,
1502                                         struct sock_xprt, xprt);
1503
1504                         /* Reset TCP record info */
1505                         transport->tcp_offset = 0;
1506                         transport->tcp_reclen = 0;
1507                         transport->tcp_copied = 0;
1508                         transport->tcp_flags =
1509                                 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1510                         xprt->connect_cookie++;
1511
1512                         xprt_wake_pending_tasks(xprt, -EAGAIN);
1513                 }
1514                 spin_unlock(&xprt->transport_lock);
1515                 break;
1516         case TCP_FIN_WAIT1:
1517                 /* The client initiated a shutdown of the socket */
1518                 xprt->connect_cookie++;
1519                 xprt->reestablish_timeout = 0;
1520                 set_bit(XPRT_CLOSING, &xprt->state);
1521                 smp_mb__before_atomic();
1522                 clear_bit(XPRT_CONNECTED, &xprt->state);
1523                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1524                 smp_mb__after_atomic();
1525                 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1526                 break;
1527         case TCP_CLOSE_WAIT:
1528                 /* The server initiated a shutdown of the socket */
1529                 xprt->connect_cookie++;
1530                 clear_bit(XPRT_CONNECTED, &xprt->state);
1531                 xs_tcp_force_close(xprt);
1532         case TCP_CLOSING:
1533                 /*
1534                  * If the server closed down the connection, make sure that
1535                  * we back off before reconnecting
1536                  */
1537                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1538                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1539                 break;
1540         case TCP_LAST_ACK:
1541                 set_bit(XPRT_CLOSING, &xprt->state);
1542                 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1543                 smp_mb__before_atomic();
1544                 clear_bit(XPRT_CONNECTED, &xprt->state);
1545                 smp_mb__after_atomic();
1546                 break;
1547         case TCP_CLOSE:
1548                 xs_tcp_cancel_linger_timeout(xprt);
1549                 xs_sock_mark_closed(xprt);
1550         }
1551  out:
1552         read_unlock_bh(&sk->sk_callback_lock);
1553 }
1554
1555 static void xs_write_space(struct sock *sk)
1556 {
1557         struct socket *sock;
1558         struct rpc_xprt *xprt;
1559
1560         if (unlikely(!(sock = sk->sk_socket)))
1561                 return;
1562         clear_bit(SOCK_NOSPACE, &sock->flags);
1563
1564         if (unlikely(!(xprt = xprt_from_sock(sk))))
1565                 return;
1566         if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1567                 return;
1568
1569         xprt_write_space(xprt);
1570 }
1571
1572 /**
1573  * xs_udp_write_space - callback invoked when socket buffer space
1574  *                             becomes available
1575  * @sk: socket whose state has changed
1576  *
1577  * Called when more output buffer space is available for this socket.
1578  * We try not to wake our writers until they can make "significant"
1579  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1580  * with a bunch of small requests.
1581  */
1582 static void xs_udp_write_space(struct sock *sk)
1583 {
1584         read_lock_bh(&sk->sk_callback_lock);
1585
1586         /* from net/core/sock.c:sock_def_write_space */
1587         if (sock_writeable(sk))
1588                 xs_write_space(sk);
1589
1590         read_unlock_bh(&sk->sk_callback_lock);
1591 }
1592
1593 /**
1594  * xs_tcp_write_space - callback invoked when socket buffer space
1595  *                             becomes available
1596  * @sk: socket whose state has changed
1597  *
1598  * Called when more output buffer space is available for this socket.
1599  * We try not to wake our writers until they can make "significant"
1600  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1601  * with a bunch of small requests.
1602  */
1603 static void xs_tcp_write_space(struct sock *sk)
1604 {
1605         read_lock_bh(&sk->sk_callback_lock);
1606
1607         /* from net/core/stream.c:sk_stream_write_space */
1608         if (sk_stream_is_writeable(sk))
1609                 xs_write_space(sk);
1610
1611         read_unlock_bh(&sk->sk_callback_lock);
1612 }
1613
1614 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1615 {
1616         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1617         struct sock *sk = transport->inet;
1618
1619         if (transport->rcvsize) {
1620                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1621                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1622         }
1623         if (transport->sndsize) {
1624                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1625                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1626                 sk->sk_write_space(sk);
1627         }
1628 }
1629
1630 /**
1631  * xs_udp_set_buffer_size - set send and receive limits
1632  * @xprt: generic transport
1633  * @sndsize: requested size of send buffer, in bytes
1634  * @rcvsize: requested size of receive buffer, in bytes
1635  *
1636  * Set socket send and receive buffer size limits.
1637  */
1638 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1639 {
1640         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1641
1642         transport->sndsize = 0;
1643         if (sndsize)
1644                 transport->sndsize = sndsize + 1024;
1645         transport->rcvsize = 0;
1646         if (rcvsize)
1647                 transport->rcvsize = rcvsize + 1024;
1648
1649         xs_udp_do_set_buffer_size(xprt);
1650 }
1651
1652 /**
1653  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1654  * @task: task that timed out
1655  *
1656  * Adjust the congestion window after a retransmit timeout has occurred.
1657  */
1658 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1659 {
1660         xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1661 }
1662
1663 static unsigned short xs_get_random_port(void)
1664 {
1665         unsigned short range = xprt_max_resvport - xprt_min_resvport;
1666         unsigned short rand = (unsigned short) prandom_u32() % range;
1667         return rand + xprt_min_resvport;
1668 }
1669
1670 /**
1671  * xs_set_reuseaddr_port - set the socket's port and address reuse options
1672  * @sock: socket
1673  *
1674  * Note that this function has to be called on all sockets that share the
1675  * same port, and it must be called before binding.
1676  */
1677 static void xs_sock_set_reuseport(struct socket *sock)
1678 {
1679         char opt = 1;
1680
1681         kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt));
1682 }
1683
1684 static unsigned short xs_sock_getport(struct socket *sock)
1685 {
1686         struct sockaddr_storage buf;
1687         int buflen;
1688         unsigned short port = 0;
1689
1690         if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1691                 goto out;
1692         switch (buf.ss_family) {
1693         case AF_INET6:
1694                 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1695                 break;
1696         case AF_INET:
1697                 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1698         }
1699 out:
1700         return port;
1701 }
1702
1703 /**
1704  * xs_set_port - reset the port number in the remote endpoint address
1705  * @xprt: generic transport
1706  * @port: new port number
1707  *
1708  */
1709 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1710 {
1711         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1712
1713         rpc_set_port(xs_addr(xprt), port);
1714         xs_update_peer_port(xprt);
1715 }
1716
1717 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1718 {
1719         if (transport->srcport == 0)
1720                 transport->srcport = xs_sock_getport(sock);
1721 }
1722
1723 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1724 {
1725         unsigned short port = transport->srcport;
1726
1727         if (port == 0 && transport->xprt.resvport)
1728                 port = xs_get_random_port();
1729         return port;
1730 }
1731
1732 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1733 {
1734         if (transport->srcport != 0)
1735                 transport->srcport = 0;
1736         if (!transport->xprt.resvport)
1737                 return 0;
1738         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1739                 return xprt_max_resvport;
1740         return --port;
1741 }
1742 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1743 {
1744         struct sockaddr_storage myaddr;
1745         int err, nloop = 0;
1746         unsigned short port = xs_get_srcport(transport);
1747         unsigned short last;
1748
1749         /*
1750          * If we are asking for any ephemeral port (i.e. port == 0 &&
1751          * transport->xprt.resvport == 0), don't bind.  Let the local
1752          * port selection happen implicitly when the socket is used
1753          * (for example at connect time).
1754          *
1755          * This ensures that we can continue to establish TCP
1756          * connections even when all local ephemeral ports are already
1757          * a part of some TCP connection.  This makes no difference
1758          * for UDP sockets, but also doens't harm them.
1759          *
1760          * If we're asking for any reserved port (i.e. port == 0 &&
1761          * transport->xprt.resvport == 1) xs_get_srcport above will
1762          * ensure that port is non-zero and we will bind as needed.
1763          */
1764         if (port == 0)
1765                 return 0;
1766
1767         memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1768         do {
1769                 rpc_set_port((struct sockaddr *)&myaddr, port);
1770                 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1771                                 transport->xprt.addrlen);
1772                 if (err == 0) {
1773                         transport->srcport = port;
1774                         break;
1775                 }
1776                 last = port;
1777                 port = xs_next_srcport(transport, port);
1778                 if (port > last)
1779                         nloop++;
1780         } while (err == -EADDRINUSE && nloop != 2);
1781
1782         if (myaddr.ss_family == AF_INET)
1783                 dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
1784                                 &((struct sockaddr_in *)&myaddr)->sin_addr,
1785                                 port, err ? "failed" : "ok", err);
1786         else
1787                 dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
1788                                 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1789                                 port, err ? "failed" : "ok", err);
1790         return err;
1791 }
1792
1793 /*
1794  * We don't support autobind on AF_LOCAL sockets
1795  */
1796 static void xs_local_rpcbind(struct rpc_task *task)
1797 {
1798         rcu_read_lock();
1799         xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1800         rcu_read_unlock();
1801 }
1802
1803 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1804 {
1805 }
1806
1807 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1808 static struct lock_class_key xs_key[2];
1809 static struct lock_class_key xs_slock_key[2];
1810
1811 static inline void xs_reclassify_socketu(struct socket *sock)
1812 {
1813         struct sock *sk = sock->sk;
1814
1815         sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1816                 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1817 }
1818
1819 static inline void xs_reclassify_socket4(struct socket *sock)
1820 {
1821         struct sock *sk = sock->sk;
1822
1823         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1824                 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1825 }
1826
1827 static inline void xs_reclassify_socket6(struct socket *sock)
1828 {
1829         struct sock *sk = sock->sk;
1830
1831         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1832                 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1833 }
1834
1835 static inline void xs_reclassify_socket(int family, struct socket *sock)
1836 {
1837         WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1838         if (sock_owned_by_user(sock->sk))
1839                 return;
1840
1841         switch (family) {
1842         case AF_LOCAL:
1843                 xs_reclassify_socketu(sock);
1844                 break;
1845         case AF_INET:
1846                 xs_reclassify_socket4(sock);
1847                 break;
1848         case AF_INET6:
1849                 xs_reclassify_socket6(sock);
1850                 break;
1851         }
1852 }
1853 #else
1854 static inline void xs_reclassify_socketu(struct socket *sock)
1855 {
1856 }
1857
1858 static inline void xs_reclassify_socket4(struct socket *sock)
1859 {
1860 }
1861
1862 static inline void xs_reclassify_socket6(struct socket *sock)
1863 {
1864 }
1865
1866 static inline void xs_reclassify_socket(int family, struct socket *sock)
1867 {
1868 }
1869 #endif
1870
1871 static void xs_dummy_setup_socket(struct work_struct *work)
1872 {
1873 }
1874
1875 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1876                 struct sock_xprt *transport, int family, int type,
1877                 int protocol, bool reuseport)
1878 {
1879         struct socket *sock;
1880         int err;
1881
1882         err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1883         if (err < 0) {
1884                 dprintk("RPC:       can't create %d transport socket (%d).\n",
1885                                 protocol, -err);
1886                 goto out;
1887         }
1888         xs_reclassify_socket(family, sock);
1889
1890         if (reuseport)
1891                 xs_sock_set_reuseport(sock);
1892
1893         err = xs_bind(transport, sock);
1894         if (err) {
1895                 sock_release(sock);
1896                 goto out;
1897         }
1898
1899         return sock;
1900 out:
1901         return ERR_PTR(err);
1902 }
1903
1904 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1905                                       struct socket *sock)
1906 {
1907         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1908                                                                         xprt);
1909
1910         if (!transport->inet) {
1911                 struct sock *sk = sock->sk;
1912
1913                 write_lock_bh(&sk->sk_callback_lock);
1914
1915                 xs_save_old_callbacks(transport, sk);
1916
1917                 sk->sk_user_data = xprt;
1918                 sk->sk_data_ready = xs_local_data_ready;
1919                 sk->sk_write_space = xs_udp_write_space;
1920                 sk->sk_error_report = xs_error_report;
1921                 sk->sk_allocation = GFP_ATOMIC;
1922
1923                 xprt_clear_connected(xprt);
1924
1925                 /* Reset to new socket */
1926                 transport->sock = sock;
1927                 transport->inet = sk;
1928
1929                 write_unlock_bh(&sk->sk_callback_lock);
1930         }
1931
1932         /* Tell the socket layer to start connecting... */
1933         xprt->stat.connect_count++;
1934         xprt->stat.connect_start = jiffies;
1935         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1936 }
1937
1938 /**
1939  * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1940  * @xprt: RPC transport to connect
1941  * @transport: socket transport to connect
1942  * @create_sock: function to create a socket of the correct type
1943  */
1944 static int xs_local_setup_socket(struct sock_xprt *transport)
1945 {
1946         struct rpc_xprt *xprt = &transport->xprt;
1947         struct socket *sock;
1948         int status = -EIO;
1949
1950         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1951         status = __sock_create(xprt->xprt_net, AF_LOCAL,
1952                                         SOCK_STREAM, 0, &sock, 1);
1953         if (status < 0) {
1954                 dprintk("RPC:       can't create AF_LOCAL "
1955                         "transport socket (%d).\n", -status);
1956                 goto out;
1957         }
1958         xs_reclassify_socketu(sock);
1959
1960         dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
1961                         xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1962
1963         status = xs_local_finish_connecting(xprt, sock);
1964         trace_rpc_socket_connect(xprt, sock, status);
1965         switch (status) {
1966         case 0:
1967                 dprintk("RPC:       xprt %p connected to %s\n",
1968                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1969                 xprt_set_connected(xprt);
1970         case -ENOBUFS:
1971                 break;
1972         case -ENOENT:
1973                 dprintk("RPC:       xprt %p: socket %s does not exist\n",
1974                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1975                 break;
1976         case -ECONNREFUSED:
1977                 dprintk("RPC:       xprt %p: connection refused for %s\n",
1978                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1979                 break;
1980         default:
1981                 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1982                                 __func__, -status,
1983                                 xprt->address_strings[RPC_DISPLAY_ADDR]);
1984         }
1985
1986 out:
1987         xprt_clear_connecting(xprt);
1988         xprt_wake_pending_tasks(xprt, status);
1989         return status;
1990 }
1991
1992 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1993 {
1994         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1995         int ret;
1996
1997          if (RPC_IS_ASYNC(task)) {
1998                 /*
1999                  * We want the AF_LOCAL connect to be resolved in the
2000                  * filesystem namespace of the process making the rpc
2001                  * call.  Thus we connect synchronously.
2002                  *
2003                  * If we want to support asynchronous AF_LOCAL calls,
2004                  * we'll need to figure out how to pass a namespace to
2005                  * connect.
2006                  */
2007                 rpc_exit(task, -ENOTCONN);
2008                 return;
2009         }
2010         ret = xs_local_setup_socket(transport);
2011         if (ret && !RPC_IS_SOFTCONN(task))
2012                 msleep_interruptible(15000);
2013 }
2014
2015 #ifdef CONFIG_SUNRPC_SWAP
2016 static void xs_set_memalloc(struct rpc_xprt *xprt)
2017 {
2018         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2019                         xprt);
2020
2021         if (xprt->swapper)
2022                 sk_set_memalloc(transport->inet);
2023 }
2024
2025 /**
2026  * xs_swapper - Tag this transport as being used for swap.
2027  * @xprt: transport to tag
2028  * @enable: enable/disable
2029  *
2030  */
2031 int xs_swapper(struct rpc_xprt *xprt, int enable)
2032 {
2033         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2034                         xprt);
2035         int err = 0;
2036
2037         if (enable) {
2038                 xprt->swapper++;
2039                 xs_set_memalloc(xprt);
2040         } else if (xprt->swapper) {
2041                 xprt->swapper--;
2042                 sk_clear_memalloc(transport->inet);
2043         }
2044
2045         return err;
2046 }
2047 EXPORT_SYMBOL_GPL(xs_swapper);
2048 #else
2049 static void xs_set_memalloc(struct rpc_xprt *xprt)
2050 {
2051 }
2052 #endif
2053
2054 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2055 {
2056         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2057
2058         if (!transport->inet) {
2059                 struct sock *sk = sock->sk;
2060
2061                 write_lock_bh(&sk->sk_callback_lock);
2062
2063                 xs_save_old_callbacks(transport, sk);
2064
2065                 sk->sk_user_data = xprt;
2066                 sk->sk_data_ready = xs_udp_data_ready;
2067                 sk->sk_write_space = xs_udp_write_space;
2068                 sk->sk_allocation = GFP_ATOMIC;
2069
2070                 xprt_set_connected(xprt);
2071
2072                 /* Reset to new socket */
2073                 transport->sock = sock;
2074                 transport->inet = sk;
2075
2076                 xs_set_memalloc(xprt);
2077
2078                 write_unlock_bh(&sk->sk_callback_lock);
2079         }
2080         xs_udp_do_set_buffer_size(xprt);
2081 }
2082
2083 static void xs_udp_setup_socket(struct work_struct *work)
2084 {
2085         struct sock_xprt *transport =
2086                 container_of(work, struct sock_xprt, connect_worker.work);
2087         struct rpc_xprt *xprt = &transport->xprt;
2088         struct socket *sock = transport->sock;
2089         int status = -EIO;
2090
2091         /* Start by resetting any existing state */
2092         xs_reset_transport(transport);
2093         sock = xs_create_sock(xprt, transport,
2094                         xs_addr(xprt)->sa_family, SOCK_DGRAM,
2095                         IPPROTO_UDP, false);
2096         if (IS_ERR(sock))
2097                 goto out;
2098
2099         dprintk("RPC:       worker connecting xprt %p via %s to "
2100                                 "%s (port %s)\n", xprt,
2101                         xprt->address_strings[RPC_DISPLAY_PROTO],
2102                         xprt->address_strings[RPC_DISPLAY_ADDR],
2103                         xprt->address_strings[RPC_DISPLAY_PORT]);
2104
2105         xs_udp_finish_connecting(xprt, sock);
2106         trace_rpc_socket_connect(xprt, sock, 0);
2107         status = 0;
2108 out:
2109         xprt_clear_connecting(xprt);
2110         xprt_wake_pending_tasks(xprt, status);
2111 }
2112
2113 /*
2114  * We need to preserve the port number so the reply cache on the server can
2115  * find our cached RPC replies when we get around to reconnecting.
2116  */
2117 static void xs_abort_connection(struct sock_xprt *transport)
2118 {
2119         int result;
2120         struct sockaddr any;
2121
2122         dprintk("RPC:       disconnecting xprt %p to reuse port\n", transport);
2123
2124         /*
2125          * Disconnect the transport socket by doing a connect operation
2126          * with AF_UNSPEC.  This should return immediately...
2127          */
2128         memset(&any, 0, sizeof(any));
2129         any.sa_family = AF_UNSPEC;
2130         result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2131         trace_rpc_socket_reset_connection(&transport->xprt,
2132                         transport->sock, result);
2133         if (!result)
2134                 xs_sock_reset_connection_flags(&transport->xprt);
2135         dprintk("RPC:       AF_UNSPEC connect return code %d\n", result);
2136 }
2137
2138 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2139 {
2140         unsigned int state = transport->inet->sk_state;
2141
2142         if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2143                 /* we don't need to abort the connection if the socket
2144                  * hasn't undergone a shutdown
2145                  */
2146                 if (transport->inet->sk_shutdown == 0)
2147                         return;
2148                 dprintk("RPC:       %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2149                                 __func__, transport->inet->sk_shutdown);
2150         }
2151         if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2152                 /* we don't need to abort the connection if the socket
2153                  * hasn't undergone a shutdown
2154                  */
2155                 if (transport->inet->sk_shutdown == 0)
2156                         return;
2157                 dprintk("RPC:       %s: ESTABLISHED/SYN_SENT "
2158                                 "sk_shutdown set to %d\n",
2159                                 __func__, transport->inet->sk_shutdown);
2160         }
2161         xs_abort_connection(transport);
2162 }
2163
2164 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2165 {
2166         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2167         int ret = -ENOTCONN;
2168
2169         if (!transport->inet) {
2170                 struct sock *sk = sock->sk;
2171                 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2172                 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2173                 unsigned int opt_on = 1;
2174
2175                 /* TCP Keepalive options */
2176                 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2177                                 (char *)&opt_on, sizeof(opt_on));
2178                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2179                                 (char *)&keepidle, sizeof(keepidle));
2180                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2181                                 (char *)&keepidle, sizeof(keepidle));
2182                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2183                                 (char *)&keepcnt, sizeof(keepcnt));
2184
2185                 write_lock_bh(&sk->sk_callback_lock);
2186
2187                 xs_save_old_callbacks(transport, sk);
2188
2189                 sk->sk_user_data = xprt;
2190                 sk->sk_data_ready = xs_tcp_data_ready;
2191                 sk->sk_state_change = xs_tcp_state_change;
2192                 sk->sk_write_space = xs_tcp_write_space;
2193                 sk->sk_error_report = xs_error_report;
2194                 sk->sk_allocation = GFP_ATOMIC;
2195
2196                 /* socket options */
2197                 sock_reset_flag(sk, SOCK_LINGER);
2198                 tcp_sk(sk)->linger2 = 0;
2199                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2200
2201                 xprt_clear_connected(xprt);
2202
2203                 /* Reset to new socket */
2204                 transport->sock = sock;
2205                 transport->inet = sk;
2206
2207                 write_unlock_bh(&sk->sk_callback_lock);
2208         }
2209
2210         if (!xprt_bound(xprt))
2211                 goto out;
2212
2213         xs_set_memalloc(xprt);
2214
2215         /* Tell the socket layer to start connecting... */
2216         xprt->stat.connect_count++;
2217         xprt->stat.connect_start = jiffies;
2218         ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2219         switch (ret) {
2220         case 0:
2221                 xs_set_srcport(transport, sock);
2222         case -EINPROGRESS:
2223                 /* SYN_SENT! */
2224                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2225                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2226         }
2227 out:
2228         return ret;
2229 }
2230
2231 /**
2232  * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2233  * @xprt: RPC transport to connect
2234  * @transport: socket transport to connect
2235  * @create_sock: function to create a socket of the correct type
2236  *
2237  * Invoked by a work queue tasklet.
2238  */
2239 static void xs_tcp_setup_socket(struct work_struct *work)
2240 {
2241         struct sock_xprt *transport =
2242                 container_of(work, struct sock_xprt, connect_worker.work);
2243         struct socket *sock = transport->sock;
2244         struct rpc_xprt *xprt = &transport->xprt;
2245         int status = -EIO;
2246
2247         if (!sock) {
2248                 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2249                 sock = xs_create_sock(xprt, transport,
2250                                 xs_addr(xprt)->sa_family, SOCK_STREAM,
2251                                 IPPROTO_TCP, true);
2252                 if (IS_ERR(sock)) {
2253                         status = PTR_ERR(sock);
2254                         goto out;
2255                 }
2256         } else {
2257                 int abort_and_exit;
2258
2259                 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2260                                 &xprt->state);
2261                 /* "close" the socket, preserving the local port */
2262                 set_bit(XPRT_CONNECTION_REUSE, &xprt->state);
2263                 xs_tcp_reuse_connection(transport);
2264                 clear_bit(XPRT_CONNECTION_REUSE, &xprt->state);
2265
2266                 if (abort_and_exit)
2267                         goto out_eagain;
2268         }
2269
2270         dprintk("RPC:       worker connecting xprt %p via %s to "
2271                                 "%s (port %s)\n", xprt,
2272                         xprt->address_strings[RPC_DISPLAY_PROTO],
2273                         xprt->address_strings[RPC_DISPLAY_ADDR],
2274                         xprt->address_strings[RPC_DISPLAY_PORT]);
2275
2276         status = xs_tcp_finish_connecting(xprt, sock);
2277         trace_rpc_socket_connect(xprt, sock, status);
2278         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
2279                         xprt, -status, xprt_connected(xprt),
2280                         sock->sk->sk_state);
2281         switch (status) {
2282         default:
2283                 printk("%s: connect returned unhandled error %d\n",
2284                         __func__, status);
2285         case -EADDRNOTAVAIL:
2286                 /* We're probably in TIME_WAIT. Get rid of existing socket,
2287                  * and retry
2288                  */
2289                 xs_tcp_force_close(xprt);
2290                 break;
2291         case 0:
2292         case -EINPROGRESS:
2293         case -EALREADY:
2294                 xprt_clear_connecting(xprt);
2295                 return;
2296         case -EINVAL:
2297                 /* Happens, for instance, if the user specified a link
2298                  * local IPv6 address without a scope-id.
2299                  */
2300         case -ECONNREFUSED:
2301         case -ECONNRESET:
2302         case -ENETUNREACH:
2303         case -EADDRINUSE:
2304         case -ENOBUFS:
2305                 /* retry with existing socket, after a delay */
2306                 goto out;
2307         }
2308 out_eagain:
2309         status = -EAGAIN;
2310 out:
2311         xprt_clear_connecting(xprt);
2312         xprt_wake_pending_tasks(xprt, status);
2313 }
2314
2315 /**
2316  * xs_connect - connect a socket to a remote endpoint
2317  * @xprt: pointer to transport structure
2318  * @task: address of RPC task that manages state of connect request
2319  *
2320  * TCP: If the remote end dropped the connection, delay reconnecting.
2321  *
2322  * UDP socket connects are synchronous, but we use a work queue anyway
2323  * to guarantee that even unprivileged user processes can set up a
2324  * socket on a privileged port.
2325  *
2326  * If a UDP socket connect fails, the delay behavior here prevents
2327  * retry floods (hard mounts).
2328  */
2329 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2330 {
2331         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2332
2333         if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2334                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
2335                                 "seconds\n",
2336                                 xprt, xprt->reestablish_timeout / HZ);
2337                 queue_delayed_work(rpciod_workqueue,
2338                                    &transport->connect_worker,
2339                                    xprt->reestablish_timeout);
2340                 xprt->reestablish_timeout <<= 1;
2341                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2342                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2343                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2344                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2345         } else {
2346                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
2347                 queue_delayed_work(rpciod_workqueue,
2348                                    &transport->connect_worker, 0);
2349         }
2350 }
2351
2352 /**
2353  * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2354  * @xprt: rpc_xprt struct containing statistics
2355  * @seq: output file
2356  *
2357  */
2358 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2359 {
2360         long idle_time = 0;
2361
2362         if (xprt_connected(xprt))
2363                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2364
2365         seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2366                         "%llu %llu %lu %llu %llu\n",
2367                         xprt->stat.bind_count,
2368                         xprt->stat.connect_count,
2369                         xprt->stat.connect_time,
2370                         idle_time,
2371                         xprt->stat.sends,
2372                         xprt->stat.recvs,
2373                         xprt->stat.bad_xids,
2374                         xprt->stat.req_u,
2375                         xprt->stat.bklog_u,
2376                         xprt->stat.max_slots,
2377                         xprt->stat.sending_u,
2378                         xprt->stat.pending_u);
2379 }
2380
2381 /**
2382  * xs_udp_print_stats - display UDP socket-specifc stats
2383  * @xprt: rpc_xprt struct containing statistics
2384  * @seq: output file
2385  *
2386  */
2387 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2388 {
2389         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2390
2391         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2392                         "%lu %llu %llu\n",
2393                         transport->srcport,
2394                         xprt->stat.bind_count,
2395                         xprt->stat.sends,
2396                         xprt->stat.recvs,
2397                         xprt->stat.bad_xids,
2398                         xprt->stat.req_u,
2399                         xprt->stat.bklog_u,
2400                         xprt->stat.max_slots,
2401                         xprt->stat.sending_u,
2402                         xprt->stat.pending_u);
2403 }
2404
2405 /**
2406  * xs_tcp_print_stats - display TCP socket-specifc stats
2407  * @xprt: rpc_xprt struct containing statistics
2408  * @seq: output file
2409  *
2410  */
2411 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2412 {
2413         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2414         long idle_time = 0;
2415
2416         if (xprt_connected(xprt))
2417                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2418
2419         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2420                         "%llu %llu %lu %llu %llu\n",
2421                         transport->srcport,
2422                         xprt->stat.bind_count,
2423                         xprt->stat.connect_count,
2424                         xprt->stat.connect_time,
2425                         idle_time,
2426                         xprt->stat.sends,
2427                         xprt->stat.recvs,
2428                         xprt->stat.bad_xids,
2429                         xprt->stat.req_u,
2430                         xprt->stat.bklog_u,
2431                         xprt->stat.max_slots,
2432                         xprt->stat.sending_u,
2433                         xprt->stat.pending_u);
2434 }
2435
2436 /*
2437  * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2438  * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2439  * to use the server side send routines.
2440  */
2441 static void *bc_malloc(struct rpc_task *task, size_t size)
2442 {
2443         struct page *page;
2444         struct rpc_buffer *buf;
2445
2446         WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2447         if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2448                 return NULL;
2449
2450         page = alloc_page(GFP_KERNEL);
2451         if (!page)
2452                 return NULL;
2453
2454         buf = page_address(page);
2455         buf->len = PAGE_SIZE;
2456
2457         return buf->data;
2458 }
2459
2460 /*
2461  * Free the space allocated in the bc_alloc routine
2462  */
2463 static void bc_free(void *buffer)
2464 {
2465         struct rpc_buffer *buf;
2466
2467         if (!buffer)
2468                 return;
2469
2470         buf = container_of(buffer, struct rpc_buffer, data);
2471         free_page((unsigned long)buf);
2472 }
2473
2474 /*
2475  * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2476  * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2477  */
2478 static int bc_sendto(struct rpc_rqst *req)
2479 {
2480         int len;
2481         struct xdr_buf *xbufp = &req->rq_snd_buf;
2482         struct rpc_xprt *xprt = req->rq_xprt;
2483         struct sock_xprt *transport =
2484                                 container_of(xprt, struct sock_xprt, xprt);
2485         struct socket *sock = transport->sock;
2486         unsigned long headoff;
2487         unsigned long tailoff;
2488
2489         xs_encode_stream_record_marker(xbufp);
2490
2491         tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2492         headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2493         len = svc_send_common(sock, xbufp,
2494                               virt_to_page(xbufp->head[0].iov_base), headoff,
2495                               xbufp->tail[0].iov_base, tailoff);
2496
2497         if (len != xbufp->len) {
2498                 printk(KERN_NOTICE "Error sending entire callback!\n");
2499                 len = -EAGAIN;
2500         }
2501
2502         return len;
2503 }
2504
2505 /*
2506  * The send routine. Borrows from svc_send
2507  */
2508 static int bc_send_request(struct rpc_task *task)
2509 {
2510         struct rpc_rqst *req = task->tk_rqstp;
2511         struct svc_xprt *xprt;
2512         u32                     len;
2513
2514         dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2515         /*
2516          * Get the server socket associated with this callback xprt
2517          */
2518         xprt = req->rq_xprt->bc_xprt;
2519
2520         /*
2521          * Grab the mutex to serialize data as the connection is shared
2522          * with the fore channel
2523          */
2524         if (!mutex_trylock(&xprt->xpt_mutex)) {
2525                 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2526                 if (!mutex_trylock(&xprt->xpt_mutex))
2527                         return -EAGAIN;
2528                 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2529         }
2530         if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2531                 len = -ENOTCONN;
2532         else
2533                 len = bc_sendto(req);
2534         mutex_unlock(&xprt->xpt_mutex);
2535
2536         if (len > 0)
2537                 len = 0;
2538
2539         return len;
2540 }
2541
2542 /*
2543  * The close routine. Since this is client initiated, we do nothing
2544  */
2545
2546 static void bc_close(struct rpc_xprt *xprt)
2547 {
2548 }
2549
2550 /*
2551  * The xprt destroy routine. Again, because this connection is client
2552  * initiated, we do nothing
2553  */
2554
2555 static void bc_destroy(struct rpc_xprt *xprt)
2556 {
2557         dprintk("RPC:       bc_destroy xprt %p\n", xprt);
2558
2559         xs_xprt_free(xprt);
2560         module_put(THIS_MODULE);
2561 }
2562
2563 static struct rpc_xprt_ops xs_local_ops = {
2564         .reserve_xprt           = xprt_reserve_xprt,
2565         .release_xprt           = xs_tcp_release_xprt,
2566         .alloc_slot             = xprt_alloc_slot,
2567         .rpcbind                = xs_local_rpcbind,
2568         .set_port               = xs_local_set_port,
2569         .connect                = xs_local_connect,
2570         .buf_alloc              = rpc_malloc,
2571         .buf_free               = rpc_free,
2572         .send_request           = xs_local_send_request,
2573         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2574         .close                  = xs_close,
2575         .destroy                = xs_destroy,
2576         .print_stats            = xs_local_print_stats,
2577 };
2578
2579 static struct rpc_xprt_ops xs_udp_ops = {
2580         .set_buffer_size        = xs_udp_set_buffer_size,
2581         .reserve_xprt           = xprt_reserve_xprt_cong,
2582         .release_xprt           = xprt_release_xprt_cong,
2583         .alloc_slot             = xprt_alloc_slot,
2584         .rpcbind                = rpcb_getport_async,
2585         .set_port               = xs_set_port,
2586         .connect                = xs_connect,
2587         .buf_alloc              = rpc_malloc,
2588         .buf_free               = rpc_free,
2589         .send_request           = xs_udp_send_request,
2590         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
2591         .timer                  = xs_udp_timer,
2592         .release_request        = xprt_release_rqst_cong,
2593         .close                  = xs_close,
2594         .destroy                = xs_destroy,
2595         .print_stats            = xs_udp_print_stats,
2596 };
2597
2598 static struct rpc_xprt_ops xs_tcp_ops = {
2599         .reserve_xprt           = xprt_reserve_xprt,
2600         .release_xprt           = xs_tcp_release_xprt,
2601         .alloc_slot             = xprt_lock_and_alloc_slot,
2602         .rpcbind                = rpcb_getport_async,
2603         .set_port               = xs_set_port,
2604         .connect                = xs_connect,
2605         .buf_alloc              = rpc_malloc,
2606         .buf_free               = rpc_free,
2607         .send_request           = xs_tcp_send_request,
2608         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2609         .close                  = xs_tcp_close,
2610         .destroy                = xs_destroy,
2611         .print_stats            = xs_tcp_print_stats,
2612 };
2613
2614 /*
2615  * The rpc_xprt_ops for the server backchannel
2616  */
2617
2618 static struct rpc_xprt_ops bc_tcp_ops = {
2619         .reserve_xprt           = xprt_reserve_xprt,
2620         .release_xprt           = xprt_release_xprt,
2621         .alloc_slot             = xprt_alloc_slot,
2622         .buf_alloc              = bc_malloc,
2623         .buf_free               = bc_free,
2624         .send_request           = bc_send_request,
2625         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2626         .close                  = bc_close,
2627         .destroy                = bc_destroy,
2628         .print_stats            = xs_tcp_print_stats,
2629 };
2630
2631 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2632 {
2633         static const struct sockaddr_in sin = {
2634                 .sin_family             = AF_INET,
2635                 .sin_addr.s_addr        = htonl(INADDR_ANY),
2636         };
2637         static const struct sockaddr_in6 sin6 = {
2638                 .sin6_family            = AF_INET6,
2639                 .sin6_addr              = IN6ADDR_ANY_INIT,
2640         };
2641
2642         switch (family) {
2643         case AF_LOCAL:
2644                 break;
2645         case AF_INET:
2646                 memcpy(sap, &sin, sizeof(sin));
2647                 break;
2648         case AF_INET6:
2649                 memcpy(sap, &sin6, sizeof(sin6));
2650                 break;
2651         default:
2652                 dprintk("RPC:       %s: Bad address family\n", __func__);
2653                 return -EAFNOSUPPORT;
2654         }
2655         return 0;
2656 }
2657
2658 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2659                                       unsigned int slot_table_size,
2660                                       unsigned int max_slot_table_size)
2661 {
2662         struct rpc_xprt *xprt;
2663         struct sock_xprt *new;
2664
2665         if (args->addrlen > sizeof(xprt->addr)) {
2666                 dprintk("RPC:       xs_setup_xprt: address too large\n");
2667                 return ERR_PTR(-EBADF);
2668         }
2669
2670         xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2671                         max_slot_table_size);
2672         if (xprt == NULL) {
2673                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
2674                                 "rpc_xprt\n");
2675                 return ERR_PTR(-ENOMEM);
2676         }
2677
2678         new = container_of(xprt, struct sock_xprt, xprt);
2679         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2680         xprt->addrlen = args->addrlen;
2681         if (args->srcaddr)
2682                 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2683         else {
2684                 int err;
2685                 err = xs_init_anyaddr(args->dstaddr->sa_family,
2686                                         (struct sockaddr *)&new->srcaddr);
2687                 if (err != 0) {
2688                         xprt_free(xprt);
2689                         return ERR_PTR(err);
2690                 }
2691         }
2692
2693         return xprt;
2694 }
2695
2696 static const struct rpc_timeout xs_local_default_timeout = {
2697         .to_initval = 10 * HZ,
2698         .to_maxval = 10 * HZ,
2699         .to_retries = 2,
2700 };
2701
2702 /**
2703  * xs_setup_local - Set up transport to use an AF_LOCAL socket
2704  * @args: rpc transport creation arguments
2705  *
2706  * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2707  */
2708 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2709 {
2710         struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2711         struct sock_xprt *transport;
2712         struct rpc_xprt *xprt;
2713         struct rpc_xprt *ret;
2714
2715         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2716                         xprt_max_tcp_slot_table_entries);
2717         if (IS_ERR(xprt))
2718                 return xprt;
2719         transport = container_of(xprt, struct sock_xprt, xprt);
2720
2721         xprt->prot = 0;
2722         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2723         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2724
2725         xprt->bind_timeout = XS_BIND_TO;
2726         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2727         xprt->idle_timeout = XS_IDLE_DISC_TO;
2728
2729         xprt->ops = &xs_local_ops;
2730         xprt->timeout = &xs_local_default_timeout;
2731
2732         INIT_DELAYED_WORK(&transport->connect_worker,
2733                         xs_dummy_setup_socket);
2734
2735         switch (sun->sun_family) {
2736         case AF_LOCAL:
2737                 if (sun->sun_path[0] != '/') {
2738                         dprintk("RPC:       bad AF_LOCAL address: %s\n",
2739                                         sun->sun_path);
2740                         ret = ERR_PTR(-EINVAL);
2741                         goto out_err;
2742                 }
2743                 xprt_set_bound(xprt);
2744                 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2745                 ret = ERR_PTR(xs_local_setup_socket(transport));
2746                 if (ret)
2747                         goto out_err;
2748                 break;
2749         default:
2750                 ret = ERR_PTR(-EAFNOSUPPORT);
2751                 goto out_err;
2752         }
2753
2754         dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
2755                         xprt->address_strings[RPC_DISPLAY_ADDR]);
2756
2757         if (try_module_get(THIS_MODULE))
2758                 return xprt;
2759         ret = ERR_PTR(-EINVAL);
2760 out_err:
2761         xs_xprt_free(xprt);
2762         return ret;
2763 }
2764
2765 static const struct rpc_timeout xs_udp_default_timeout = {
2766         .to_initval = 5 * HZ,
2767         .to_maxval = 30 * HZ,
2768         .to_increment = 5 * HZ,
2769         .to_retries = 5,
2770 };
2771
2772 /**
2773  * xs_setup_udp - Set up transport to use a UDP socket
2774  * @args: rpc transport creation arguments
2775  *
2776  */
2777 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2778 {
2779         struct sockaddr *addr = args->dstaddr;
2780         struct rpc_xprt *xprt;
2781         struct sock_xprt *transport;
2782         struct rpc_xprt *ret;
2783
2784         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2785                         xprt_udp_slot_table_entries);
2786         if (IS_ERR(xprt))
2787                 return xprt;
2788         transport = container_of(xprt, struct sock_xprt, xprt);
2789
2790         xprt->prot = IPPROTO_UDP;
2791         xprt->tsh_size = 0;
2792         /* XXX: header size can vary due to auth type, IPv6, etc. */
2793         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2794
2795         xprt->bind_timeout = XS_BIND_TO;
2796         xprt->reestablish_timeout = XS_UDP_REEST_TO;
2797         xprt->idle_timeout = XS_IDLE_DISC_TO;
2798
2799         xprt->ops = &xs_udp_ops;
2800
2801         xprt->timeout = &xs_udp_default_timeout;
2802
2803         switch (addr->sa_family) {
2804         case AF_INET:
2805                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2806                         xprt_set_bound(xprt);
2807
2808                 INIT_DELAYED_WORK(&transport->connect_worker,
2809                                         xs_udp_setup_socket);
2810                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2811                 break;
2812         case AF_INET6:
2813                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2814                         xprt_set_bound(xprt);
2815
2816                 INIT_DELAYED_WORK(&transport->connect_worker,
2817                                         xs_udp_setup_socket);
2818                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2819                 break;
2820         default:
2821                 ret = ERR_PTR(-EAFNOSUPPORT);
2822                 goto out_err;
2823         }
2824
2825         if (xprt_bound(xprt))
2826                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2827                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2828                                 xprt->address_strings[RPC_DISPLAY_PORT],
2829                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2830         else
2831                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2832                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2833                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2834
2835         if (try_module_get(THIS_MODULE))
2836                 return xprt;
2837         ret = ERR_PTR(-EINVAL);
2838 out_err:
2839         xs_xprt_free(xprt);
2840         return ret;
2841 }
2842
2843 static const struct rpc_timeout xs_tcp_default_timeout = {
2844         .to_initval = 60 * HZ,
2845         .to_maxval = 60 * HZ,
2846         .to_retries = 2,
2847 };
2848
2849 /**
2850  * xs_setup_tcp - Set up transport to use a TCP socket
2851  * @args: rpc transport creation arguments
2852  *
2853  */
2854 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2855 {
2856         struct sockaddr *addr = args->dstaddr;
2857         struct rpc_xprt *xprt;
2858         struct sock_xprt *transport;
2859         struct rpc_xprt *ret;
2860         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2861
2862         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2863                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2864
2865         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2866                         max_slot_table_size);
2867         if (IS_ERR(xprt))
2868                 return xprt;
2869         transport = container_of(xprt, struct sock_xprt, xprt);
2870
2871         xprt->prot = IPPROTO_TCP;
2872         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2873         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2874
2875         xprt->bind_timeout = XS_BIND_TO;
2876         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2877         xprt->idle_timeout = XS_IDLE_DISC_TO;
2878
2879         xprt->ops = &xs_tcp_ops;
2880         xprt->timeout = &xs_tcp_default_timeout;
2881
2882         switch (addr->sa_family) {
2883         case AF_INET:
2884                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2885                         xprt_set_bound(xprt);
2886
2887                 INIT_DELAYED_WORK(&transport->connect_worker,
2888                                         xs_tcp_setup_socket);
2889                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2890                 break;
2891         case AF_INET6:
2892                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2893                         xprt_set_bound(xprt);
2894
2895                 INIT_DELAYED_WORK(&transport->connect_worker,
2896                                         xs_tcp_setup_socket);
2897                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2898                 break;
2899         default:
2900                 ret = ERR_PTR(-EAFNOSUPPORT);
2901                 goto out_err;
2902         }
2903
2904         if (xprt_bound(xprt))
2905                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2906                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2907                                 xprt->address_strings[RPC_DISPLAY_PORT],
2908                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2909         else
2910                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2911                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2912                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2913
2914         if (try_module_get(THIS_MODULE))
2915                 return xprt;
2916         ret = ERR_PTR(-EINVAL);
2917 out_err:
2918         xs_xprt_free(xprt);
2919         return ret;
2920 }
2921
2922 /**
2923  * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2924  * @args: rpc transport creation arguments
2925  *
2926  */
2927 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2928 {
2929         struct sockaddr *addr = args->dstaddr;
2930         struct rpc_xprt *xprt;
2931         struct sock_xprt *transport;
2932         struct svc_sock *bc_sock;
2933         struct rpc_xprt *ret;
2934
2935         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2936                         xprt_tcp_slot_table_entries);
2937         if (IS_ERR(xprt))
2938                 return xprt;
2939         transport = container_of(xprt, struct sock_xprt, xprt);
2940
2941         xprt->prot = IPPROTO_TCP;
2942         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2943         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2944         xprt->timeout = &xs_tcp_default_timeout;
2945
2946         /* backchannel */
2947         xprt_set_bound(xprt);
2948         xprt->bind_timeout = 0;
2949         xprt->reestablish_timeout = 0;
2950         xprt->idle_timeout = 0;
2951
2952         xprt->ops = &bc_tcp_ops;
2953
2954         switch (addr->sa_family) {
2955         case AF_INET:
2956                 xs_format_peer_addresses(xprt, "tcp",
2957                                          RPCBIND_NETID_TCP);
2958                 break;
2959         case AF_INET6:
2960                 xs_format_peer_addresses(xprt, "tcp",
2961                                    RPCBIND_NETID_TCP6);
2962                 break;
2963         default:
2964                 ret = ERR_PTR(-EAFNOSUPPORT);
2965                 goto out_err;
2966         }
2967
2968         dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2969                         xprt->address_strings[RPC_DISPLAY_ADDR],
2970                         xprt->address_strings[RPC_DISPLAY_PORT],
2971                         xprt->address_strings[RPC_DISPLAY_PROTO]);
2972
2973         /*
2974          * Once we've associated a backchannel xprt with a connection,
2975          * we want to keep it around as long as the connection lasts,
2976          * in case we need to start using it for a backchannel again;
2977          * this reference won't be dropped until bc_xprt is destroyed.
2978          */
2979         xprt_get(xprt);
2980         args->bc_xprt->xpt_bc_xprt = xprt;
2981         xprt->bc_xprt = args->bc_xprt;
2982         bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2983         transport->sock = bc_sock->sk_sock;
2984         transport->inet = bc_sock->sk_sk;
2985
2986         /*
2987          * Since we don't want connections for the backchannel, we set
2988          * the xprt status to connected
2989          */
2990         xprt_set_connected(xprt);
2991
2992         if (try_module_get(THIS_MODULE))
2993                 return xprt;
2994
2995         args->bc_xprt->xpt_bc_xprt = NULL;
2996         xprt_put(xprt);
2997         ret = ERR_PTR(-EINVAL);
2998 out_err:
2999         xs_xprt_free(xprt);
3000         return ret;
3001 }
3002
3003 static struct xprt_class        xs_local_transport = {
3004         .list           = LIST_HEAD_INIT(xs_local_transport.list),
3005         .name           = "named UNIX socket",
3006         .owner          = THIS_MODULE,
3007         .ident          = XPRT_TRANSPORT_LOCAL,
3008         .setup          = xs_setup_local,
3009 };
3010
3011 static struct xprt_class        xs_udp_transport = {
3012         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
3013         .name           = "udp",
3014         .owner          = THIS_MODULE,
3015         .ident          = XPRT_TRANSPORT_UDP,
3016         .setup          = xs_setup_udp,
3017 };
3018
3019 static struct xprt_class        xs_tcp_transport = {
3020         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
3021         .name           = "tcp",
3022         .owner          = THIS_MODULE,
3023         .ident          = XPRT_TRANSPORT_TCP,
3024         .setup          = xs_setup_tcp,
3025 };
3026
3027 static struct xprt_class        xs_bc_tcp_transport = {
3028         .list           = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3029         .name           = "tcp NFSv4.1 backchannel",
3030         .owner          = THIS_MODULE,
3031         .ident          = XPRT_TRANSPORT_BC_TCP,
3032         .setup          = xs_setup_bc_tcp,
3033 };
3034
3035 /**
3036  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3037  *
3038  */
3039 int init_socket_xprt(void)
3040 {
3041 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3042         if (!sunrpc_table_header)
3043                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3044 #endif
3045
3046         xprt_register_transport(&xs_local_transport);
3047         xprt_register_transport(&xs_udp_transport);
3048         xprt_register_transport(&xs_tcp_transport);
3049         xprt_register_transport(&xs_bc_tcp_transport);
3050
3051         return 0;
3052 }
3053
3054 /**
3055  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3056  *
3057  */
3058 void cleanup_socket_xprt(void)
3059 {
3060 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3061         if (sunrpc_table_header) {
3062                 unregister_sysctl_table(sunrpc_table_header);
3063                 sunrpc_table_header = NULL;
3064         }
3065 #endif
3066
3067         xprt_unregister_transport(&xs_local_transport);
3068         xprt_unregister_transport(&xs_udp_transport);
3069         xprt_unregister_transport(&xs_tcp_transport);
3070         xprt_unregister_transport(&xs_bc_tcp_transport);
3071 }
3072
3073 static int param_set_uint_minmax(const char *val,
3074                 const struct kernel_param *kp,
3075                 unsigned int min, unsigned int max)
3076 {
3077         unsigned int num;
3078         int ret;
3079
3080         if (!val)
3081                 return -EINVAL;
3082         ret = kstrtouint(val, 0, &num);
3083         if (ret == -EINVAL || num < min || num > max)
3084                 return -EINVAL;
3085         *((unsigned int *)kp->arg) = num;
3086         return 0;
3087 }
3088
3089 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3090 {
3091         return param_set_uint_minmax(val, kp,
3092                         RPC_MIN_RESVPORT,
3093                         RPC_MAX_RESVPORT);
3094 }
3095
3096 static struct kernel_param_ops param_ops_portnr = {
3097         .set = param_set_portnr,
3098         .get = param_get_uint,
3099 };
3100
3101 #define param_check_portnr(name, p) \
3102         __param_check(name, p, unsigned int);
3103
3104 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3105 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3106
3107 static int param_set_slot_table_size(const char *val,
3108                                      const struct kernel_param *kp)
3109 {
3110         return param_set_uint_minmax(val, kp,
3111                         RPC_MIN_SLOT_TABLE,
3112                         RPC_MAX_SLOT_TABLE);
3113 }
3114
3115 static struct kernel_param_ops param_ops_slot_table_size = {
3116         .set = param_set_slot_table_size,
3117         .get = param_get_uint,
3118 };
3119
3120 #define param_check_slot_table_size(name, p) \
3121         __param_check(name, p, unsigned int);
3122
3123 static int param_set_max_slot_table_size(const char *val,
3124                                      const struct kernel_param *kp)
3125 {
3126         return param_set_uint_minmax(val, kp,
3127                         RPC_MIN_SLOT_TABLE,
3128                         RPC_MAX_SLOT_TABLE_LIMIT);
3129 }
3130
3131 static struct kernel_param_ops param_ops_max_slot_table_size = {
3132         .set = param_set_max_slot_table_size,
3133         .get = param_get_uint,
3134 };
3135
3136 #define param_check_max_slot_table_size(name, p) \
3137         __param_check(name, p, unsigned int);
3138
3139 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3140                    slot_table_size, 0644);
3141 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3142                    max_slot_table_size, 0644);
3143 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3144                    slot_table_size, 0644);
3145