net/sunrpc/xprtsock.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/net/sunrpc/xprtsock.c
   4  *
   5  * Client-side transport implementation for sockets.
   6  *
   7  * TCP callback races fixes (C) 1998 Red Hat
   8  * TCP send fixes (C) 1998 Red Hat
   9  * TCP NFS related read + write fixes
  10  *  (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
  11  *
  12  * Rewrite of larges part of the code in order to stabilize TCP stuff.
  13  * Fix behaviour when socket buffer is full.
  14  *  (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
  15  *
  16  * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
  17  *
  18  * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
  19  *   <gilles.quillard@bull.net>
  20  */
  21
  22 #include <linux/types.h>
  23 #include <linux/string.h>
  24 #include <linux/slab.h>
  25 #include <linux/module.h>
  26 #include <linux/capability.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/errno.h>
  29 #include <linux/socket.h>
  30 #include <linux/in.h>
  31 #include <linux/net.h>
  32 #include <linux/mm.h>
  33 #include <linux/un.h>
  34 #include <linux/udp.h>
  35 #include <linux/tcp.h>
  36 #include <linux/sunrpc/clnt.h>
  37 #include <linux/sunrpc/addr.h>
  38 #include <linux/sunrpc/sched.h>
  39 #include <linux/sunrpc/svcsock.h>
  40 #include <linux/sunrpc/xprtsock.h>
  41 #include <linux/file.h>
  42 #ifdef CONFIG_SUNRPC_BACKCHANNEL
  43 #include <linux/sunrpc/bc_xprt.h>
  44 #endif
  45
  46 #include <net/sock.h>
  47 #include <net/checksum.h>
  48 #include <net/udp.h>
  49 #include <net/tcp.h>
  50 #include <linux/bvec.h>
  51 #include <linux/highmem.h>
  52 #include <linux/uio.h>
  53 #include <linux/sched/mm.h>
  54
  55 #include <trace/events/sunrpc.h>
  56
  57 #include "socklib.h"
  58 #include "sunrpc.h"
  59
  60 static void xs_close(struct rpc_xprt *xprt);
  61 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
  62                 struct socket *sock);
  63
  64 /*
  65  * xprtsock tunables
  66  */
  67 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  68 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
  69 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
  70
  71 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  72 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  73
  74 #define XS_TCP_LINGER_TO        (15U * HZ)
  75 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
  76
  77 /*
  78  * We can register our own files under /proc/sys/sunrpc by
  79  * calling register_sysctl_table() again.  The files in that
  80  * directory become the union of all files registered there.
  81  *
  82  * We simply need to make sure that we don't collide with
  83  * someone else's file names!
  84  */
  85
  86 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  87 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  88 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
  89 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  90 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  91
  92 static struct ctl_table_header *sunrpc_table_header;
  93
  94 /*
  95  * FIXME: changing the UDP slot table size should also resize the UDP
  96  *        socket buffers for existing UDP transports
  97  */
  98 static struct ctl_table xs_tunables_table[] = {
  99         {
 100                 .procname       = "udp_slot_table_entries",
 101                 .data           = &xprt_udp_slot_table_entries,
 102                 .maxlen         = sizeof(unsigned int),
 103                 .mode           = 0644,
 104                 .proc_handler   = proc_dointvec_minmax,
 105                 .extra1         = &min_slot_table_size,
 106                 .extra2         = &max_slot_table_size
 107         },
 108         {
 109                 .procname       = "tcp_slot_table_entries",
 110                 .data           = &xprt_tcp_slot_table_entries,
 111                 .maxlen         = sizeof(unsigned int),
 112                 .mode           = 0644,
 113                 .proc_handler   = proc_dointvec_minmax,
 114                 .extra1         = &min_slot_table_size,
 115                 .extra2         = &max_slot_table_size
 116         },
 117         {
 118                 .procname       = "tcp_max_slot_table_entries",
 119                 .data           = &xprt_max_tcp_slot_table_entries,
 120                 .maxlen         = sizeof(unsigned int),
 121                 .mode           = 0644,
 122                 .proc_handler   = proc_dointvec_minmax,
 123                 .extra1         = &min_slot_table_size,
 124                 .extra2         = &max_tcp_slot_table_limit
 125         },
 126         {
 127                 .procname       = "min_resvport",
 128                 .data           = &xprt_min_resvport,
 129                 .maxlen         = sizeof(unsigned int),
 130                 .mode           = 0644,
 131                 .proc_handler   = proc_dointvec_minmax,
 132                 .extra1         = &xprt_min_resvport_limit,
 133                 .extra2         = &xprt_max_resvport_limit
 134         },
 135         {
 136                 .procname       = "max_resvport",
 137                 .data           = &xprt_max_resvport,
 138                 .maxlen         = sizeof(unsigned int),
 139                 .mode           = 0644,
 140                 .proc_handler   = proc_dointvec_minmax,
 141                 .extra1         = &xprt_min_resvport_limit,
 142                 .extra2         = &xprt_max_resvport_limit
 143         },
 144         {
 145                 .procname       = "tcp_fin_timeout",
 146                 .data           = &xs_tcp_fin_timeout,
 147                 .maxlen         = sizeof(xs_tcp_fin_timeout),
 148                 .mode           = 0644,
 149                 .proc_handler   = proc_dointvec_jiffies,
 150         },
 151         { },
 152 };
 153
 154 static struct ctl_table sunrpc_table[] = {
 155         {
 156                 .procname       = "sunrpc",
 157                 .mode           = 0555,
 158                 .child          = xs_tunables_table
 159         },
 160         { },
 161 };
 162
 163 /*
 164  * Wait duration for a reply from the RPC portmapper.
 165  */
 166 #define XS_BIND_TO              (60U * HZ)
 167
 168 /*
 169  * Delay if a UDP socket connect error occurs.  This is most likely some
 170  * kind of resource problem on the local host.
 171  */
 172 #define XS_UDP_REEST_TO         (2U * HZ)
 173
 174 /*
 175  * The reestablish timeout allows clients to delay for a bit before attempting
 176  * to reconnect to a server that just dropped our connection.
 177  *
 178  * We implement an exponential backoff when trying to reestablish a TCP
 179  * transport connection with the server.  Some servers like to drop a TCP
 180  * connection when they are overworked, so we start with a short timeout and
 181  * increase over time if the server is down or not responding.
 182  */
 183 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
 184
 185 /*
 186  * TCP idle timeout; client drops the transport socket if it is idle
 187  * for this long.  Note that we also timeout UDP sockets to prevent
 188  * holding port numbers when there is no RPC traffic.
 189  */
 190 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 191
 192 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 193 # undef  RPC_DEBUG_DATA
 194 # define RPCDBG_FACILITY        RPCDBG_TRANS
 195 #endif
 196
 197 #ifdef RPC_DEBUG_DATA
 198 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 199 {
 200         u8 *buf = (u8 *) packet;
 201         int j;
 202
 203         dprintk("RPC:       %s\n", msg);
 204         for (j = 0; j < count && j < 128; j += 4) {
 205                 if (!(j & 31)) {
 206                         if (j)
 207                                 dprintk("\n");
 208                         dprintk("0x%04x ", j);
 209                 }
 210                 dprintk("%02x%02x%02x%02x ",
 211                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
 212         }
 213         dprintk("\n");
 214 }
 215 #else
 216 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 217 {
 218         /* NOP */
 219 }
 220 #endif
 221
 222 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 223 {
 224         return (struct rpc_xprt *) sk->sk_user_data;
 225 }
 226
 227 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 228 {
 229         return (struct sockaddr *) &xprt->addr;
 230 }
 231
 232 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
 233 {
 234         return (struct sockaddr_un *) &xprt->addr;
 235 }
 236
 237 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
 238 {
 239         return (struct sockaddr_in *) &xprt->addr;
 240 }
 241
 242 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
 243 {
 244         return (struct sockaddr_in6 *) &xprt->addr;
 245 }
 246
 247 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
 248 {
 249         struct sockaddr *sap = xs_addr(xprt);
 250         struct sockaddr_in6 *sin6;
 251         struct sockaddr_in *sin;
 252         struct sockaddr_un *sun;
 253         char buf[128];
 254
 255         switch (sap->sa_family) {
 256         case AF_LOCAL:
 257                 sun = xs_addr_un(xprt);
 258                 strlcpy(buf, sun->sun_path, sizeof(buf));
 259                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 260                                                 kstrdup(buf, GFP_KERNEL);
 261                 break;
 262         case AF_INET:
 263                 (void)rpc_ntop(sap, buf, sizeof(buf));
 264                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 265                                                 kstrdup(buf, GFP_KERNEL);
 266                 sin = xs_addr_in(xprt);
 267                 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
 268                 break;
 269         case AF_INET6:
 270                 (void)rpc_ntop(sap, buf, sizeof(buf));
 271                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 272                                                 kstrdup(buf, GFP_KERNEL);
 273                 sin6 = xs_addr_in6(xprt);
 274                 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
 275                 break;
 276         default:
 277                 BUG();
 278         }
 279
 280         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
 281 }
 282
 283 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
 284 {
 285         struct sockaddr *sap = xs_addr(xprt);
 286         char buf[128];
 287
 288         snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
 289         xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
 290
 291         snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
 292         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
 293 }
 294
 295 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
 296                                      const char *protocol,
 297                                      const char *netid)
 298 {
 299         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 300         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 301         xs_format_common_peer_addresses(xprt);
 302         xs_format_common_peer_ports(xprt);
 303 }
 304
 305 static void xs_update_peer_port(struct rpc_xprt *xprt)
 306 {
 307         kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
 308         kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
 309
 310         xs_format_common_peer_ports(xprt);
 311 }
 312
 313 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 314 {
 315         unsigned int i;
 316
 317         for (i = 0; i < RPC_DISPLAY_MAX; i++)
 318                 switch (i) {
 319                 case RPC_DISPLAY_PROTO:
 320                 case RPC_DISPLAY_NETID:
 321                         continue;
 322                 default:
 323                         kfree(xprt->address_strings[i]);
 324                 }
 325 }
 326
 327 static size_t
 328 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
 329 {
 330         size_t i,n;
 331
 332         if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
 333                 return want;
 334         n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
 335         for (i = 0; i < n; i++) {
 336                 if (buf->pages[i])
 337                         continue;
 338                 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
 339                 if (!buf->pages[i]) {
 340                         i *= PAGE_SIZE;
 341                         return i > buf->page_base ? i - buf->page_base : 0;
 342                 }
 343         }
 344         return want;
 345 }
 346
 347 static ssize_t
 348 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
 349 {
 350         ssize_t ret;
 351         if (seek != 0)
 352                 iov_iter_advance(&msg->msg_iter, seek);
 353         ret = sock_recvmsg(sock, msg, flags);
 354         return ret > 0 ? ret + seek : ret;
 355 }
 356
 357 static ssize_t
 358 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
 359                 struct kvec *kvec, size_t count, size_t seek)
 360 {
 361         iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
 362         return xs_sock_recvmsg(sock, msg, flags, seek);
 363 }
 364
 365 static ssize_t
 366 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
 367                 struct bio_vec *bvec, unsigned long nr, size_t count,
 368                 size_t seek)
 369 {
 370         iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
 371         return xs_sock_recvmsg(sock, msg, flags, seek);
 372 }
 373
 374 static ssize_t
 375 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
 376                 size_t count)
 377 {
 378         iov_iter_discard(&msg->msg_iter, READ, count);
 379         return sock_recvmsg(sock, msg, flags);
 380 }
 381
 382 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 383 static void
 384 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
 385 {
 386         struct bvec_iter bi = {
 387                 .bi_size = count,
 388         };
 389         struct bio_vec bv;
 390
 391         bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
 392         for_each_bvec(bv, bvec, bi, bi)
 393                 flush_dcache_page(bv.bv_page);
 394 }
 395 #else
 396 static inline void
 397 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
 398 {
 399 }
 400 #endif
 401
 402 static ssize_t
 403 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
 404                 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
 405 {
 406         size_t want, seek_init = seek, offset = 0;
 407         ssize_t ret;
 408
 409         want = min_t(size_t, count, buf->head[0].iov_len);
 410         if (seek < want) {
 411                 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
 412                 if (ret <= 0)
 413                         goto sock_err;
 414                 offset += ret;
 415                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 416                         goto out;
 417                 if (ret != want)
 418                         goto out;
 419                 seek = 0;
 420         } else {
 421                 seek -= want;
 422                 offset += want;
 423         }
 424
 425         want = xs_alloc_sparse_pages(buf,
 426                         min_t(size_t, count - offset, buf->page_len),
 427                         GFP_KERNEL);
 428         if (seek < want) {
 429                 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
 430                                 xdr_buf_pagecount(buf),
 431                                 want + buf->page_base,
 432                                 seek + buf->page_base);
 433                 if (ret <= 0)
 434                         goto sock_err;
 435                 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
 436                 ret -= buf->page_base;
 437                 offset += ret;
 438                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 439                         goto out;
 440                 if (ret != want)
 441                         goto out;
 442                 seek = 0;
 443         } else {
 444                 seek -= want;
 445                 offset += want;
 446         }
 447
 448         want = min_t(size_t, count - offset, buf->tail[0].iov_len);
 449         if (seek < want) {
 450                 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
 451                 if (ret <= 0)
 452                         goto sock_err;
 453                 offset += ret;
 454                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 455                         goto out;
 456                 if (ret != want)
 457                         goto out;
 458         } else if (offset < seek_init)
 459                 offset = seek_init;
 460         ret = -EMSGSIZE;
 461 out:
 462         *read = offset - seek_init;
 463         return ret;
 464 sock_err:
 465         offset += seek;
 466         goto out;
 467 }
 468
 469 static void
 470 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
 471 {
 472         if (!transport->recv.copied) {
 473                 if (buf->head[0].iov_len >= transport->recv.offset)
 474                         memcpy(buf->head[0].iov_base,
 475                                         &transport->recv.xid,
 476                                         transport->recv.offset);
 477                 transport->recv.copied = transport->recv.offset;
 478         }
 479 }
 480
 481 static bool
 482 xs_read_stream_request_done(struct sock_xprt *transport)
 483 {
 484         return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
 485 }
 486
 487 static void
 488 xs_read_stream_check_eor(struct sock_xprt *transport,
 489                 struct msghdr *msg)
 490 {
 491         if (xs_read_stream_request_done(transport))
 492                 msg->msg_flags |= MSG_EOR;
 493 }
 494
 495 static ssize_t
 496 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
 497                 int flags, struct rpc_rqst *req)
 498 {
 499         struct xdr_buf *buf = &req->rq_private_buf;
 500         size_t want, read;
 501         ssize_t ret;
 502
 503         xs_read_header(transport, buf);
 504
 505         want = transport->recv.len - transport->recv.offset;
 506         if (want != 0) {
 507                 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
 508                                 transport->recv.copied + want,
 509                                 transport->recv.copied,
 510                                 &read);
 511                 transport->recv.offset += read;
 512                 transport->recv.copied += read;
 513         }
 514
 515         if (transport->recv.offset == transport->recv.len)
 516                 xs_read_stream_check_eor(transport, msg);
 517
 518         if (want == 0)
 519                 return 0;
 520
 521         switch (ret) {
 522         default:
 523                 break;
 524         case -EFAULT:
 525         case -EMSGSIZE:
 526                 msg->msg_flags |= MSG_TRUNC;
 527                 return read;
 528         case 0:
 529                 return -ESHUTDOWN;
 530         }
 531         return ret < 0 ? ret : read;
 532 }
 533
 534 static size_t
 535 xs_read_stream_headersize(bool isfrag)
 536 {
 537         if (isfrag)
 538                 return sizeof(__be32);
 539         return 3 * sizeof(__be32);
 540 }
 541
 542 static ssize_t
 543 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
 544                 int flags, size_t want, size_t seek)
 545 {
 546         struct kvec kvec = {
 547                 .iov_base = &transport->recv.fraghdr,
 548                 .iov_len = want,
 549         };
 550         return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
 551 }
 552
 553 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 554 static ssize_t
 555 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
 556 {
 557         struct rpc_xprt *xprt = &transport->xprt;
 558         struct rpc_rqst *req;
 559         ssize_t ret;
 560
 561         /* Look up and lock the request corresponding to the given XID */
 562         req = xprt_lookup_bc_request(xprt, transport->recv.xid);
 563         if (!req) {
 564                 printk(KERN_WARNING "Callback slot table overflowed\n");
 565                 return -ESHUTDOWN;
 566         }
 567         if (transport->recv.copied && !req->rq_private_buf.len)
 568                 return -ESHUTDOWN;
 569
 570         ret = xs_read_stream_request(transport, msg, flags, req);
 571         if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 572                 xprt_complete_bc_request(req, transport->recv.copied);
 573         else
 574                 req->rq_private_buf.len = transport->recv.copied;
 575
 576         return ret;
 577 }
 578 #else /* CONFIG_SUNRPC_BACKCHANNEL */
 579 static ssize_t
 580 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
 581 {
 582         return -ESHUTDOWN;
 583 }
 584 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 585
 586 static ssize_t
 587 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
 588 {
 589         struct rpc_xprt *xprt = &transport->xprt;
 590         struct rpc_rqst *req;
 591         ssize_t ret = 0;
 592
 593         /* Look up and lock the request corresponding to the given XID */
 594         spin_lock(&xprt->queue_lock);
 595         req = xprt_lookup_rqst(xprt, transport->recv.xid);
 596         if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
 597                 msg->msg_flags |= MSG_TRUNC;
 598                 goto out;
 599         }
 600         xprt_pin_rqst(req);
 601         spin_unlock(&xprt->queue_lock);
 602
 603         ret = xs_read_stream_request(transport, msg, flags, req);
 604
 605         spin_lock(&xprt->queue_lock);
 606         if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 607                 xprt_complete_rqst(req->rq_task, transport->recv.copied);
 608         else
 609                 req->rq_private_buf.len = transport->recv.copied;
 610         xprt_unpin_rqst(req);
 611 out:
 612         spin_unlock(&xprt->queue_lock);
 613         return ret;
 614 }
 615
 616 static ssize_t
 617 xs_read_stream(struct sock_xprt *transport, int flags)
 618 {
 619         struct msghdr msg = { 0 };
 620         size_t want, read = 0;
 621         ssize_t ret = 0;
 622
 623         if (transport->recv.len == 0) {
 624                 want = xs_read_stream_headersize(transport->recv.copied != 0);
 625                 ret = xs_read_stream_header(transport, &msg, flags, want,
 626                                 transport->recv.offset);
 627                 if (ret <= 0)
 628                         goto out_err;
 629                 transport->recv.offset = ret;
 630                 if (transport->recv.offset != want)
 631                         return transport->recv.offset;
 632                 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
 633                         RPC_FRAGMENT_SIZE_MASK;
 634                 transport->recv.offset -= sizeof(transport->recv.fraghdr);
 635                 read = ret;
 636         }
 637
 638         switch (be32_to_cpu(transport->recv.calldir)) {
 639         default:
 640                 msg.msg_flags |= MSG_TRUNC;
 641                 break;
 642         case RPC_CALL:
 643                 ret = xs_read_stream_call(transport, &msg, flags);
 644                 break;
 645         case RPC_REPLY:
 646                 ret = xs_read_stream_reply(transport, &msg, flags);
 647         }
 648         if (msg.msg_flags & MSG_TRUNC) {
 649                 transport->recv.calldir = cpu_to_be32(-1);
 650                 transport->recv.copied = -1;
 651         }
 652         if (ret < 0)
 653                 goto out_err;
 654         read += ret;
 655         if (transport->recv.offset < transport->recv.len) {
 656                 if (!(msg.msg_flags & MSG_TRUNC))
 657                         return read;
 658                 msg.msg_flags = 0;
 659                 ret = xs_read_discard(transport->sock, &msg, flags,
 660                                 transport->recv.len - transport->recv.offset);
 661                 if (ret <= 0)
 662                         goto out_err;
 663                 transport->recv.offset += ret;
 664                 read += ret;
 665                 if (transport->recv.offset != transport->recv.len)
 666                         return read;
 667         }
 668         if (xs_read_stream_request_done(transport)) {
 669                 trace_xs_stream_read_request(transport);
 670                 transport->recv.copied = 0;
 671         }
 672         transport->recv.offset = 0;
 673         transport->recv.len = 0;
 674         return read;
 675 out_err:
 676         return ret != 0 ? ret : -ESHUTDOWN;
 677 }
 678
 679 static __poll_t xs_poll_socket(struct sock_xprt *transport)
 680 {
 681         return transport->sock->ops->poll(transport->file, transport->sock,
 682                         NULL);
 683 }
 684
 685 static bool xs_poll_socket_readable(struct sock_xprt *transport)
 686 {
 687         __poll_t events = xs_poll_socket(transport);
 688
 689         return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
 690 }
 691
 692 static void xs_poll_check_readable(struct sock_xprt *transport)
 693 {
 694
 695         clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
 696         if (!xs_poll_socket_readable(transport))
 697                 return;
 698         if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
 699                 queue_work(xprtiod_workqueue, &transport->recv_worker);
 700 }
 701
 702 static void xs_stream_data_receive(struct sock_xprt *transport)
 703 {
 704         size_t read = 0;
 705         ssize_t ret = 0;
 706
 707         mutex_lock(&transport->recv_mutex);
 708         if (transport->sock == NULL)
 709                 goto out;
 710         for (;;) {
 711                 ret = xs_read_stream(transport, MSG_DONTWAIT);
 712                 if (ret < 0)
 713                         break;
 714                 read += ret;
 715                 cond_resched();
 716         }
 717         if (ret == -ESHUTDOWN)
 718                 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
 719         else
 720                 xs_poll_check_readable(transport);
 721 out:
 722         mutex_unlock(&transport->recv_mutex);
 723         trace_xs_stream_read_data(&transport->xprt, ret, read);
 724 }
 725
 726 static void xs_stream_data_receive_workfn(struct work_struct *work)
 727 {
 728         struct sock_xprt *transport =
 729                 container_of(work, struct sock_xprt, recv_worker);
 730         unsigned int pflags = memalloc_nofs_save();
 731
 732         xs_stream_data_receive(transport);
 733         memalloc_nofs_restore(pflags);
 734 }
 735
 736 static void
 737 xs_stream_reset_connect(struct sock_xprt *transport)
 738 {
 739         transport->recv.offset = 0;
 740         transport->recv.len = 0;
 741         transport->recv.copied = 0;
 742         transport->xmit.offset = 0;
 743 }
 744
 745 static void
 746 xs_stream_start_connect(struct sock_xprt *transport)
 747 {
 748         transport->xprt.stat.connect_count++;
 749         transport->xprt.stat.connect_start = jiffies;
 750 }
 751
 752 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 753
 754 /**
 755  * xs_nospace - handle transmit was incomplete
 756  * @req: pointer to RPC request
 757  *
 758  */
 759 static int xs_nospace(struct rpc_rqst *req)
 760 {
 761         struct rpc_xprt *xprt = req->rq_xprt;
 762         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 763         struct sock *sk = transport->inet;
 764         int ret = -EAGAIN;
 765
 766         trace_rpc_socket_nospace(req, transport);
 767
 768         /* Protect against races with write_space */
 769         spin_lock(&xprt->transport_lock);
 770
 771         /* Don't race with disconnect */
 772         if (xprt_connected(xprt)) {
 773                 /* wait for more buffer space */
 774                 sk->sk_write_pending++;
 775                 xprt_wait_for_buffer_space(xprt);
 776         } else
 777                 ret = -ENOTCONN;
 778
 779         spin_unlock(&xprt->transport_lock);
 780
 781         /* Race breaker in case memory is freed before above code is called */
 782         if (ret == -EAGAIN) {
 783                 struct socket_wq *wq;
 784
 785                 rcu_read_lock();
 786                 wq = rcu_dereference(sk->sk_wq);
 787                 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags);
 788                 rcu_read_unlock();
 789
 790                 sk->sk_write_space(sk);
 791         }
 792         return ret;
 793 }
 794
 795 static void
 796 xs_stream_prepare_request(struct rpc_rqst *req)
 797 {
 798         xdr_free_bvec(&req->rq_rcv_buf);
 799         req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
 800 }
 801
 802 /*
 803  * Determine if the previous message in the stream was aborted before it
 804  * could complete transmission.
 805  */
 806 static bool
 807 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
 808 {
 809         return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
 810 }
 811
 812 /*
 813  * Return the stream record marker field for a record of length < 2^31-1
 814  */
 815 static rpc_fraghdr
 816 xs_stream_record_marker(struct xdr_buf *xdr)
 817 {
 818         if (!xdr->len)
 819                 return 0;
 820         return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
 821 }
 822
 823 /**
 824  * xs_local_send_request - write an RPC request to an AF_LOCAL socket
 825  * @req: pointer to RPC request
 826  *
 827  * Return values:
 828  *        0:    The request has been sent
 829  *   EAGAIN:    The socket was blocked, please call again later to
 830  *              complete the request
 831  * ENOTCONN:    Caller needs to invoke connect logic then call again
 832  *    other:    Some other error occured, the request was not sent
 833  */
 834 static int xs_local_send_request(struct rpc_rqst *req)
 835 {
 836         struct rpc_xprt *xprt = req->rq_xprt;
 837         struct sock_xprt *transport =
 838                                 container_of(xprt, struct sock_xprt, xprt);
 839         struct xdr_buf *xdr = &req->rq_snd_buf;
 840         rpc_fraghdr rm = xs_stream_record_marker(xdr);
 841         unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
 842         struct msghdr msg = {
 843                 .msg_flags      = XS_SENDMSG_FLAGS,
 844         };
 845         unsigned int sent;
 846         int status;
 847
 848         /* Close the stream if the previous transmission was incomplete */
 849         if (xs_send_request_was_aborted(transport, req)) {
 850                 xs_close(xprt);
 851                 return -ENOTCONN;
 852         }
 853
 854         xs_pktdump("packet data:",
 855                         req->rq_svec->iov_base, req->rq_svec->iov_len);
 856
 857         req->rq_xtime = ktime_get();
 858         status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
 859                                    transport->xmit.offset, rm, &sent);
 860         dprintk("RPC:       %s(%u) = %d\n",
 861                         __func__, xdr->len - transport->xmit.offset, status);
 862
 863         if (status == -EAGAIN && sock_writeable(transport->inet))
 864                 status = -ENOBUFS;
 865
 866         if (likely(sent > 0) || status == 0) {
 867                 transport->xmit.offset += sent;
 868                 req->rq_bytes_sent = transport->xmit.offset;
 869                 if (likely(req->rq_bytes_sent >= msglen)) {
 870                         req->rq_xmit_bytes_sent += transport->xmit.offset;
 871                         transport->xmit.offset = 0;
 872                         return 0;
 873                 }
 874                 status = -EAGAIN;
 875         }
 876
 877         switch (status) {
 878         case -ENOBUFS:
 879                 break;
 880         case -EAGAIN:
 881                 status = xs_nospace(req);
 882                 break;
 883         default:
 884                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 885                         -status);
 886                 fallthrough;
 887         case -EPIPE:
 888                 xs_close(xprt);
 889                 status = -ENOTCONN;
 890         }
 891
 892         return status;
 893 }
 894
 895 /**
 896  * xs_udp_send_request - write an RPC request to a UDP socket
 897  * @req: pointer to RPC request
 898  *
 899  * Return values:
 900  *        0:    The request has been sent
 901  *   EAGAIN:    The socket was blocked, please call again later to
 902  *              complete the request
 903  * ENOTCONN:    Caller needs to invoke connect logic then call again
 904  *    other:    Some other error occurred, the request was not sent
 905  */
 906 static int xs_udp_send_request(struct rpc_rqst *req)
 907 {
 908         struct rpc_xprt *xprt = req->rq_xprt;
 909         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 910         struct xdr_buf *xdr = &req->rq_snd_buf;
 911         struct msghdr msg = {
 912                 .msg_name       = xs_addr(xprt),
 913                 .msg_namelen    = xprt->addrlen,
 914                 .msg_flags      = XS_SENDMSG_FLAGS,
 915         };
 916         unsigned int sent;
 917         int status;
 918
 919         xs_pktdump("packet data:",
 920                                 req->rq_svec->iov_base,
 921                                 req->rq_svec->iov_len);
 922
 923         if (!xprt_bound(xprt))
 924                 return -ENOTCONN;
 925
 926         if (!xprt_request_get_cong(xprt, req))
 927                 return -EBADSLT;
 928
 929         req->rq_xtime = ktime_get();
 930         status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
 931
 932         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 933                         xdr->len, status);
 934
 935         /* firewall is blocking us, don't return -EAGAIN or we end up looping */
 936         if (status == -EPERM)
 937                 goto process_status;
 938
 939         if (status == -EAGAIN && sock_writeable(transport->inet))
 940                 status = -ENOBUFS;
 941
 942         if (sent > 0 || status == 0) {
 943                 req->rq_xmit_bytes_sent += sent;
 944                 if (sent >= req->rq_slen)
 945                         return 0;
 946                 /* Still some bytes left; set up for a retry later. */
 947                 status = -EAGAIN;
 948         }
 949
 950 process_status:
 951         switch (status) {
 952         case -ENOTSOCK:
 953                 status = -ENOTCONN;
 954                 /* Should we call xs_close() here? */
 955                 break;
 956         case -EAGAIN:
 957                 status = xs_nospace(req);
 958                 break;
 959         case -ENETUNREACH:
 960         case -ENOBUFS:
 961         case -EPIPE:
 962         case -ECONNREFUSED:
 963         case -EPERM:
 964                 /* When the server has died, an ICMP port unreachable message
 965                  * prompts ECONNREFUSED. */
 966                 break;
 967         default:
 968                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 969                         -status);
 970         }
 971
 972         return status;
 973 }
 974
 975 /**
 976  * xs_tcp_send_request - write an RPC request to a TCP socket
 977  * @req: pointer to RPC request
 978  *
 979  * Return values:
 980  *        0:    The request has been sent
 981  *   EAGAIN:    The socket was blocked, please call again later to
 982  *              complete the request
 983  * ENOTCONN:    Caller needs to invoke connect logic then call again
 984  *    other:    Some other error occurred, the request was not sent
 985  *
 986  * XXX: In the case of soft timeouts, should we eventually give up
 987  *      if sendmsg is not able to make progress?
 988  */
 989 static int xs_tcp_send_request(struct rpc_rqst *req)
 990 {
 991         struct rpc_xprt *xprt = req->rq_xprt;
 992         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 993         struct xdr_buf *xdr = &req->rq_snd_buf;
 994         rpc_fraghdr rm = xs_stream_record_marker(xdr);
 995         unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
 996         struct msghdr msg = {
 997                 .msg_flags      = XS_SENDMSG_FLAGS,
 998         };
 999         bool vm_wait = false;
1000         unsigned int sent;
1001         int status;
1002
1003         /* Close the stream if the previous transmission was incomplete */
1004         if (xs_send_request_was_aborted(transport, req)) {
1005                 if (transport->sock != NULL)
1006                         kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1007                 return -ENOTCONN;
1008         }
1009
1010         xs_pktdump("packet data:",
1011                                 req->rq_svec->iov_base,
1012                                 req->rq_svec->iov_len);
1013
1014         if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1015                 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1016
1017         /* Continue transmitting the packet/record. We must be careful
1018          * to cope with writespace callbacks arriving _after_ we have
1019          * called sendmsg(). */
1020         req->rq_xtime = ktime_get();
1021         while (1) {
1022                 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1023                                            transport->xmit.offset, rm, &sent);
1024
1025                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
1026                                 xdr->len - transport->xmit.offset, status);
1027
1028                 /* If we've sent the entire packet, immediately
1029                  * reset the count of bytes sent. */
1030                 transport->xmit.offset += sent;
1031                 req->rq_bytes_sent = transport->xmit.offset;
1032                 if (likely(req->rq_bytes_sent >= msglen)) {
1033                         req->rq_xmit_bytes_sent += transport->xmit.offset;
1034                         transport->xmit.offset = 0;
1035                         return 0;
1036                 }
1037
1038                 WARN_ON_ONCE(sent == 0 && status == 0);
1039
1040                 if (status == -EAGAIN ) {
1041                         /*
1042                          * Return EAGAIN if we're sure we're hitting the
1043                          * socket send buffer limits.
1044                          */
1045                         if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1046                                 break;
1047                         /*
1048                          * Did we hit a memory allocation failure?
1049                          */
1050                         if (sent == 0) {
1051                                 status = -ENOBUFS;
1052                                 if (vm_wait)
1053                                         break;
1054                                 /* Retry, knowing now that we're below the
1055                                  * socket send buffer limit
1056                                  */
1057                                 vm_wait = true;
1058                         }
1059                         continue;
1060                 }
1061                 if (status < 0)
1062                         break;
1063                 vm_wait = false;
1064         }
1065
1066         switch (status) {
1067         case -ENOTSOCK:
1068                 status = -ENOTCONN;
1069                 /* Should we call xs_close() here? */
1070                 break;
1071         case -EAGAIN:
1072                 status = xs_nospace(req);
1073                 break;
1074         case -ECONNRESET:
1075         case -ECONNREFUSED:
1076         case -ENOTCONN:
1077         case -EADDRINUSE:
1078         case -ENOBUFS:
1079         case -EPIPE:
1080                 break;
1081         default:
1082                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
1083                         -status);
1084         }
1085
1086         return status;
1087 }
1088
1089 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1090 {
1091         transport->old_data_ready = sk->sk_data_ready;
1092         transport->old_state_change = sk->sk_state_change;
1093         transport->old_write_space = sk->sk_write_space;
1094         transport->old_error_report = sk->sk_error_report;
1095 }
1096
1097 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1098 {
1099         sk->sk_data_ready = transport->old_data_ready;
1100         sk->sk_state_change = transport->old_state_change;
1101         sk->sk_write_space = transport->old_write_space;
1102         sk->sk_error_report = transport->old_error_report;
1103 }
1104
1105 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1106 {
1107         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1108
1109         clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1110         clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1111         clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1112         clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1113 }
1114
1115 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1116 {
1117         set_bit(nr, &transport->sock_state);
1118         queue_work(xprtiod_workqueue, &transport->error_worker);
1119 }
1120
1121 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1122 {
1123         smp_mb__before_atomic();
1124         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1125         clear_bit(XPRT_CLOSING, &xprt->state);
1126         xs_sock_reset_state_flags(xprt);
1127         smp_mb__after_atomic();
1128 }
1129
1130 /**
1131  * xs_error_report - callback to handle TCP socket state errors
1132  * @sk: socket
1133  *
1134  * Note: we don't call sock_error() since there may be a rpc_task
1135  * using the socket, and so we don't want to clear sk->sk_err.
1136  */
1137 static void xs_error_report(struct sock *sk)
1138 {
1139         struct sock_xprt *transport;
1140         struct rpc_xprt *xprt;
1141
1142         read_lock_bh(&sk->sk_callback_lock);
1143         if (!(xprt = xprt_from_sock(sk)))
1144                 goto out;
1145
1146         transport = container_of(xprt, struct sock_xprt, xprt);
1147         transport->xprt_err = -sk->sk_err;
1148         if (transport->xprt_err == 0)
1149                 goto out;
1150         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
1151                         xprt, -transport->xprt_err);
1152         trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1153
1154         /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1155         smp_mb__before_atomic();
1156         xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1157  out:
1158         read_unlock_bh(&sk->sk_callback_lock);
1159 }
1160
1161 static void xs_reset_transport(struct sock_xprt *transport)
1162 {
1163         struct socket *sock = transport->sock;
1164         struct sock *sk = transport->inet;
1165         struct rpc_xprt *xprt = &transport->xprt;
1166         struct file *filp = transport->file;
1167
1168         if (sk == NULL)
1169                 return;
1170
1171         if (atomic_read(&transport->xprt.swapper))
1172                 sk_clear_memalloc(sk);
1173
1174         kernel_sock_shutdown(sock, SHUT_RDWR);
1175
1176         mutex_lock(&transport->recv_mutex);
1177         write_lock_bh(&sk->sk_callback_lock);
1178         transport->inet = NULL;
1179         transport->sock = NULL;
1180         transport->file = NULL;
1181
1182         sk->sk_user_data = NULL;
1183
1184         xs_restore_old_callbacks(transport, sk);
1185         xprt_clear_connected(xprt);
1186         write_unlock_bh(&sk->sk_callback_lock);
1187         xs_sock_reset_connection_flags(xprt);
1188         /* Reset stream record info */
1189         xs_stream_reset_connect(transport);
1190         mutex_unlock(&transport->recv_mutex);
1191
1192         trace_rpc_socket_close(xprt, sock);
1193         fput(filp);
1194
1195         xprt_disconnect_done(xprt);
1196 }
1197
1198 /**
1199  * xs_close - close a socket
1200  * @xprt: transport
1201  *
1202  * This is used when all requests are complete; ie, no DRC state remains
1203  * on the server we want to save.
1204  *
1205  * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1206  * xs_reset_transport() zeroing the socket from underneath a writer.
1207  */
1208 static void xs_close(struct rpc_xprt *xprt)
1209 {
1210         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1211
1212         dprintk("RPC:       xs_close xprt %p\n", xprt);
1213
1214         xs_reset_transport(transport);
1215         xprt->reestablish_timeout = 0;
1216 }
1217
1218 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1219 {
1220         dprintk("RPC:       injecting transport disconnect on xprt=%p\n",
1221                 xprt);
1222         xprt_disconnect_done(xprt);
1223 }
1224
1225 static void xs_xprt_free(struct rpc_xprt *xprt)
1226 {
1227         xs_free_peer_addresses(xprt);
1228         xprt_free(xprt);
1229 }
1230
1231 /**
1232  * xs_destroy - prepare to shutdown a transport
1233  * @xprt: doomed transport
1234  *
1235  */
1236 static void xs_destroy(struct rpc_xprt *xprt)
1237 {
1238         struct sock_xprt *transport = container_of(xprt,
1239                         struct sock_xprt, xprt);
1240         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
1241
1242         cancel_delayed_work_sync(&transport->connect_worker);
1243         xs_close(xprt);
1244         cancel_work_sync(&transport->recv_worker);
1245         cancel_work_sync(&transport->error_worker);
1246         xs_xprt_free(xprt);
1247         module_put(THIS_MODULE);
1248 }
1249
1250 /**
1251  * xs_udp_data_read_skb - receive callback for UDP sockets
1252  * @xprt: transport
1253  * @sk: socket
1254  * @skb: skbuff
1255  *
1256  */
1257 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1258                 struct sock *sk,
1259                 struct sk_buff *skb)
1260 {
1261         struct rpc_task *task;
1262         struct rpc_rqst *rovr;
1263         int repsize, copied;
1264         u32 _xid;
1265         __be32 *xp;
1266
1267         repsize = skb->len;
1268         if (repsize < 4) {
1269                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
1270                 return;
1271         }
1272
1273         /* Copy the XID from the skb... */
1274         xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1275         if (xp == NULL)
1276                 return;
1277
1278         /* Look up and lock the request corresponding to the given XID */
1279         spin_lock(&xprt->queue_lock);
1280         rovr = xprt_lookup_rqst(xprt, *xp);
1281         if (!rovr)
1282                 goto out_unlock;
1283         xprt_pin_rqst(rovr);
1284         xprt_update_rtt(rovr->rq_task);
1285         spin_unlock(&xprt->queue_lock);
1286         task = rovr->rq_task;
1287
1288         if ((copied = rovr->rq_private_buf.buflen) > repsize)
1289                 copied = repsize;
1290
1291         /* Suck it into the iovec, verify checksum if not done by hw. */
1292         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1293                 spin_lock(&xprt->queue_lock);
1294                 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1295                 goto out_unpin;
1296         }
1297
1298
1299         spin_lock(&xprt->transport_lock);
1300         xprt_adjust_cwnd(xprt, task, copied);
1301         spin_unlock(&xprt->transport_lock);
1302         spin_lock(&xprt->queue_lock);
1303         xprt_complete_rqst(task, copied);
1304         __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1305 out_unpin:
1306         xprt_unpin_rqst(rovr);
1307  out_unlock:
1308         spin_unlock(&xprt->queue_lock);
1309 }
1310
1311 static void xs_udp_data_receive(struct sock_xprt *transport)
1312 {
1313         struct sk_buff *skb;
1314         struct sock *sk;
1315         int err;
1316
1317         mutex_lock(&transport->recv_mutex);
1318         sk = transport->inet;
1319         if (sk == NULL)
1320                 goto out;
1321         for (;;) {
1322                 skb = skb_recv_udp(sk, 0, 1, &err);
1323                 if (skb == NULL)
1324                         break;
1325                 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1326                 consume_skb(skb);
1327                 cond_resched();
1328         }
1329         xs_poll_check_readable(transport);
1330 out:
1331         mutex_unlock(&transport->recv_mutex);
1332 }
1333
1334 static void xs_udp_data_receive_workfn(struct work_struct *work)
1335 {
1336         struct sock_xprt *transport =
1337                 container_of(work, struct sock_xprt, recv_worker);
1338         unsigned int pflags = memalloc_nofs_save();
1339
1340         xs_udp_data_receive(transport);
1341         memalloc_nofs_restore(pflags);
1342 }
1343
1344 /**
1345  * xs_data_ready - "data ready" callback for UDP sockets
1346  * @sk: socket with data to read
1347  *
1348  */
1349 static void xs_data_ready(struct sock *sk)
1350 {
1351         struct rpc_xprt *xprt;
1352
1353         read_lock_bh(&sk->sk_callback_lock);
1354         dprintk("RPC:       xs_data_ready...\n");
1355         xprt = xprt_from_sock(sk);
1356         if (xprt != NULL) {
1357                 struct sock_xprt *transport = container_of(xprt,
1358                                 struct sock_xprt, xprt);
1359                 transport->old_data_ready(sk);
1360                 /* Any data means we had a useful conversation, so
1361                  * then we don't need to delay the next reconnect
1362                  */
1363                 if (xprt->reestablish_timeout)
1364                         xprt->reestablish_timeout = 0;
1365                 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1366                         queue_work(xprtiod_workqueue, &transport->recv_worker);
1367         }
1368         read_unlock_bh(&sk->sk_callback_lock);
1369 }
1370
1371 /*
1372  * Helper function to force a TCP close if the server is sending
1373  * junk and/or it has put us in CLOSE_WAIT
1374  */
1375 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1376 {
1377         xprt_force_disconnect(xprt);
1378 }
1379
1380 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1381 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1382 {
1383         return PAGE_SIZE;
1384 }
1385 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1386
1387 /**
1388  * xs_tcp_state_change - callback to handle TCP socket state changes
1389  * @sk: socket whose state has changed
1390  *
1391  */
1392 static void xs_tcp_state_change(struct sock *sk)
1393 {
1394         struct rpc_xprt *xprt;
1395         struct sock_xprt *transport;
1396
1397         read_lock_bh(&sk->sk_callback_lock);
1398         if (!(xprt = xprt_from_sock(sk)))
1399                 goto out;
1400         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1401         dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1402                         sk->sk_state, xprt_connected(xprt),
1403                         sock_flag(sk, SOCK_DEAD),
1404                         sock_flag(sk, SOCK_ZAPPED),
1405                         sk->sk_shutdown);
1406
1407         transport = container_of(xprt, struct sock_xprt, xprt);
1408         trace_rpc_socket_state_change(xprt, sk->sk_socket);
1409         switch (sk->sk_state) {
1410         case TCP_ESTABLISHED:
1411                 if (!xprt_test_and_set_connected(xprt)) {
1412                         xprt->connect_cookie++;
1413                         clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1414                         xprt_clear_connecting(xprt);
1415
1416                         xprt->stat.connect_count++;
1417                         xprt->stat.connect_time += (long)jiffies -
1418                                                    xprt->stat.connect_start;
1419                         xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1420                 }
1421                 break;
1422         case TCP_FIN_WAIT1:
1423                 /* The client initiated a shutdown of the socket */
1424                 xprt->connect_cookie++;
1425                 xprt->reestablish_timeout = 0;
1426                 set_bit(XPRT_CLOSING, &xprt->state);
1427                 smp_mb__before_atomic();
1428                 clear_bit(XPRT_CONNECTED, &xprt->state);
1429                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1430                 smp_mb__after_atomic();
1431                 break;
1432         case TCP_CLOSE_WAIT:
1433                 /* The server initiated a shutdown of the socket */
1434                 xprt->connect_cookie++;
1435                 clear_bit(XPRT_CONNECTED, &xprt->state);
1436                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1437                 fallthrough;
1438         case TCP_CLOSING:
1439                 /*
1440                  * If the server closed down the connection, make sure that
1441                  * we back off before reconnecting
1442                  */
1443                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1444                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1445                 break;
1446         case TCP_LAST_ACK:
1447                 set_bit(XPRT_CLOSING, &xprt->state);
1448                 smp_mb__before_atomic();
1449                 clear_bit(XPRT_CONNECTED, &xprt->state);
1450                 smp_mb__after_atomic();
1451                 break;
1452         case TCP_CLOSE:
1453                 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1454                                         &transport->sock_state))
1455                         xprt_clear_connecting(xprt);
1456                 clear_bit(XPRT_CLOSING, &xprt->state);
1457                 /* Trigger the socket release */
1458                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1459         }
1460  out:
1461         read_unlock_bh(&sk->sk_callback_lock);
1462 }
1463
1464 static void xs_write_space(struct sock *sk)
1465 {
1466         struct socket_wq *wq;
1467         struct sock_xprt *transport;
1468         struct rpc_xprt *xprt;
1469
1470         if (!sk->sk_socket)
1471                 return;
1472         clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1473
1474         if (unlikely(!(xprt = xprt_from_sock(sk))))
1475                 return;
1476         transport = container_of(xprt, struct sock_xprt, xprt);
1477         rcu_read_lock();
1478         wq = rcu_dereference(sk->sk_wq);
1479         if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1480                 goto out;
1481
1482         xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1483         sk->sk_write_pending--;
1484 out:
1485         rcu_read_unlock();
1486 }
1487
1488 /**
1489  * xs_udp_write_space - callback invoked when socket buffer space
1490  *                             becomes available
1491  * @sk: socket whose state has changed
1492  *
1493  * Called when more output buffer space is available for this socket.
1494  * We try not to wake our writers until they can make "significant"
1495  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1496  * with a bunch of small requests.
1497  */
1498 static void xs_udp_write_space(struct sock *sk)
1499 {
1500         read_lock_bh(&sk->sk_callback_lock);
1501
1502         /* from net/core/sock.c:sock_def_write_space */
1503         if (sock_writeable(sk))
1504                 xs_write_space(sk);
1505
1506         read_unlock_bh(&sk->sk_callback_lock);
1507 }
1508
1509 /**
1510  * xs_tcp_write_space - callback invoked when socket buffer space
1511  *                             becomes available
1512  * @sk: socket whose state has changed
1513  *
1514  * Called when more output buffer space is available for this socket.
1515  * We try not to wake our writers until they can make "significant"
1516  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1517  * with a bunch of small requests.
1518  */
1519 static void xs_tcp_write_space(struct sock *sk)
1520 {
1521         read_lock_bh(&sk->sk_callback_lock);
1522
1523         /* from net/core/stream.c:sk_stream_write_space */
1524         if (sk_stream_is_writeable(sk))
1525                 xs_write_space(sk);
1526
1527         read_unlock_bh(&sk->sk_callback_lock);
1528 }
1529
1530 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1531 {
1532         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1533         struct sock *sk = transport->inet;
1534
1535         if (transport->rcvsize) {
1536                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1537                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1538         }
1539         if (transport->sndsize) {
1540                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1541                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1542                 sk->sk_write_space(sk);
1543         }
1544 }
1545
1546 /**
1547  * xs_udp_set_buffer_size - set send and receive limits
1548  * @xprt: generic transport
1549  * @sndsize: requested size of send buffer, in bytes
1550  * @rcvsize: requested size of receive buffer, in bytes
1551  *
1552  * Set socket send and receive buffer size limits.
1553  */
1554 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1555 {
1556         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1557
1558         transport->sndsize = 0;
1559         if (sndsize)
1560                 transport->sndsize = sndsize + 1024;
1561         transport->rcvsize = 0;
1562         if (rcvsize)
1563                 transport->rcvsize = rcvsize + 1024;
1564
1565         xs_udp_do_set_buffer_size(xprt);
1566 }
1567
1568 /**
1569  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1570  * @xprt: controlling transport
1571  * @task: task that timed out
1572  *
1573  * Adjust the congestion window after a retransmit timeout has occurred.
1574  */
1575 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1576 {
1577         spin_lock(&xprt->transport_lock);
1578         xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1579         spin_unlock(&xprt->transport_lock);
1580 }
1581
1582 static int xs_get_random_port(void)
1583 {
1584         unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1585         unsigned short range;
1586         unsigned short rand;
1587
1588         if (max < min)
1589                 return -EADDRINUSE;
1590         range = max - min + 1;
1591         rand = (unsigned short) prandom_u32() % range;
1592         return rand + min;
1593 }
1594
1595 static unsigned short xs_sock_getport(struct socket *sock)
1596 {
1597         struct sockaddr_storage buf;
1598         unsigned short port = 0;
1599
1600         if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1601                 goto out;
1602         switch (buf.ss_family) {
1603         case AF_INET6:
1604                 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1605                 break;
1606         case AF_INET:
1607                 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1608         }
1609 out:
1610         return port;
1611 }
1612
1613 /**
1614  * xs_set_port - reset the port number in the remote endpoint address
1615  * @xprt: generic transport
1616  * @port: new port number
1617  *
1618  */
1619 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1620 {
1621         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1622
1623         rpc_set_port(xs_addr(xprt), port);
1624         xs_update_peer_port(xprt);
1625 }
1626
1627 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1628 {
1629         if (transport->srcport == 0 && transport->xprt.reuseport)
1630                 transport->srcport = xs_sock_getport(sock);
1631 }
1632
1633 static int xs_get_srcport(struct sock_xprt *transport)
1634 {
1635         int port = transport->srcport;
1636
1637         if (port == 0 && transport->xprt.resvport)
1638                 port = xs_get_random_port();
1639         return port;
1640 }
1641
1642 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1643 {
1644         if (transport->srcport != 0)
1645                 transport->srcport = 0;
1646         if (!transport->xprt.resvport)
1647                 return 0;
1648         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1649                 return xprt_max_resvport;
1650         return --port;
1651 }
1652 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1653 {
1654         struct sockaddr_storage myaddr;
1655         int err, nloop = 0;
1656         int port = xs_get_srcport(transport);
1657         unsigned short last;
1658
1659         /*
1660          * If we are asking for any ephemeral port (i.e. port == 0 &&
1661          * transport->xprt.resvport == 0), don't bind.  Let the local
1662          * port selection happen implicitly when the socket is used
1663          * (for example at connect time).
1664          *
1665          * This ensures that we can continue to establish TCP
1666          * connections even when all local ephemeral ports are already
1667          * a part of some TCP connection.  This makes no difference
1668          * for UDP sockets, but also doens't harm them.
1669          *
1670          * If we're asking for any reserved port (i.e. port == 0 &&
1671          * transport->xprt.resvport == 1) xs_get_srcport above will
1672          * ensure that port is non-zero and we will bind as needed.
1673          */
1674         if (port <= 0)
1675                 return port;
1676
1677         memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1678         do {
1679                 rpc_set_port((struct sockaddr *)&myaddr, port);
1680                 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1681                                 transport->xprt.addrlen);
1682                 if (err == 0) {
1683                         transport->srcport = port;
1684                         break;
1685                 }
1686                 last = port;
1687                 port = xs_next_srcport(transport, port);
1688                 if (port > last)
1689                         nloop++;
1690         } while (err == -EADDRINUSE && nloop != 2);
1691
1692         if (myaddr.ss_family == AF_INET)
1693                 dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
1694                                 &((struct sockaddr_in *)&myaddr)->sin_addr,
1695                                 port, err ? "failed" : "ok", err);
1696         else
1697                 dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
1698                                 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1699                                 port, err ? "failed" : "ok", err);
1700         return err;
1701 }
1702
1703 /*
1704  * We don't support autobind on AF_LOCAL sockets
1705  */
1706 static void xs_local_rpcbind(struct rpc_task *task)
1707 {
1708         xprt_set_bound(task->tk_xprt);
1709 }
1710
1711 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1712 {
1713 }
1714
1715 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1716 static struct lock_class_key xs_key[2];
1717 static struct lock_class_key xs_slock_key[2];
1718
1719 static inline void xs_reclassify_socketu(struct socket *sock)
1720 {
1721         struct sock *sk = sock->sk;
1722
1723         sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1724                 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1725 }
1726
1727 static inline void xs_reclassify_socket4(struct socket *sock)
1728 {
1729         struct sock *sk = sock->sk;
1730
1731         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1732                 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1733 }
1734
1735 static inline void xs_reclassify_socket6(struct socket *sock)
1736 {
1737         struct sock *sk = sock->sk;
1738
1739         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1740                 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1741 }
1742
1743 static inline void xs_reclassify_socket(int family, struct socket *sock)
1744 {
1745         if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1746                 return;
1747
1748         switch (family) {
1749         case AF_LOCAL:
1750                 xs_reclassify_socketu(sock);
1751                 break;
1752         case AF_INET:
1753                 xs_reclassify_socket4(sock);
1754                 break;
1755         case AF_INET6:
1756                 xs_reclassify_socket6(sock);
1757                 break;
1758         }
1759 }
1760 #else
1761 static inline void xs_reclassify_socket(int family, struct socket *sock)
1762 {
1763 }
1764 #endif
1765
1766 static void xs_dummy_setup_socket(struct work_struct *work)
1767 {
1768 }
1769
1770 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1771                 struct sock_xprt *transport, int family, int type,
1772                 int protocol, bool reuseport)
1773 {
1774         struct file *filp;
1775         struct socket *sock;
1776         int err;
1777
1778         err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1779         if (err < 0) {
1780                 dprintk("RPC:       can't create %d transport socket (%d).\n",
1781                                 protocol, -err);
1782                 goto out;
1783         }
1784         xs_reclassify_socket(family, sock);
1785
1786         if (reuseport)
1787                 sock_set_reuseport(sock->sk);
1788
1789         err = xs_bind(transport, sock);
1790         if (err) {
1791                 sock_release(sock);
1792                 goto out;
1793         }
1794
1795         filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1796         if (IS_ERR(filp))
1797                 return ERR_CAST(filp);
1798         transport->file = filp;
1799
1800         return sock;
1801 out:
1802         return ERR_PTR(err);
1803 }
1804
1805 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1806                                       struct socket *sock)
1807 {
1808         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1809                                                                         xprt);
1810
1811         if (!transport->inet) {
1812                 struct sock *sk = sock->sk;
1813
1814                 write_lock_bh(&sk->sk_callback_lock);
1815
1816                 xs_save_old_callbacks(transport, sk);
1817
1818                 sk->sk_user_data = xprt;
1819                 sk->sk_data_ready = xs_data_ready;
1820                 sk->sk_write_space = xs_udp_write_space;
1821                 sock_set_flag(sk, SOCK_FASYNC);
1822                 sk->sk_error_report = xs_error_report;
1823
1824                 xprt_clear_connected(xprt);
1825
1826                 /* Reset to new socket */
1827                 transport->sock = sock;
1828                 transport->inet = sk;
1829
1830                 write_unlock_bh(&sk->sk_callback_lock);
1831         }
1832
1833         xs_stream_start_connect(transport);
1834
1835         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1836 }
1837
1838 /**
1839  * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1840  * @transport: socket transport to connect
1841  */
1842 static int xs_local_setup_socket(struct sock_xprt *transport)
1843 {
1844         struct rpc_xprt *xprt = &transport->xprt;
1845         struct file *filp;
1846         struct socket *sock;
1847         int status;
1848
1849         status = __sock_create(xprt->xprt_net, AF_LOCAL,
1850                                         SOCK_STREAM, 0, &sock, 1);
1851         if (status < 0) {
1852                 dprintk("RPC:       can't create AF_LOCAL "
1853                         "transport socket (%d).\n", -status);
1854                 goto out;
1855         }
1856         xs_reclassify_socket(AF_LOCAL, sock);
1857
1858         filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1859         if (IS_ERR(filp)) {
1860                 status = PTR_ERR(filp);
1861                 goto out;
1862         }
1863         transport->file = filp;
1864
1865         dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
1866                         xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1867
1868         status = xs_local_finish_connecting(xprt, sock);
1869         trace_rpc_socket_connect(xprt, sock, status);
1870         switch (status) {
1871         case 0:
1872                 dprintk("RPC:       xprt %p connected to %s\n",
1873                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1874                 xprt->stat.connect_count++;
1875                 xprt->stat.connect_time += (long)jiffies -
1876                                            xprt->stat.connect_start;
1877                 xprt_set_connected(xprt);
1878         case -ENOBUFS:
1879                 break;
1880         case -ENOENT:
1881                 dprintk("RPC:       xprt %p: socket %s does not exist\n",
1882                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1883                 break;
1884         case -ECONNREFUSED:
1885                 dprintk("RPC:       xprt %p: connection refused for %s\n",
1886                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1887                 break;
1888         default:
1889                 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1890                                 __func__, -status,
1891                                 xprt->address_strings[RPC_DISPLAY_ADDR]);
1892         }
1893
1894 out:
1895         xprt_clear_connecting(xprt);
1896         xprt_wake_pending_tasks(xprt, status);
1897         return status;
1898 }
1899
1900 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1901 {
1902         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1903         int ret;
1904
1905          if (RPC_IS_ASYNC(task)) {
1906                 /*
1907                  * We want the AF_LOCAL connect to be resolved in the
1908                  * filesystem namespace of the process making the rpc
1909                  * call.  Thus we connect synchronously.
1910                  *
1911                  * If we want to support asynchronous AF_LOCAL calls,
1912                  * we'll need to figure out how to pass a namespace to
1913                  * connect.
1914                  */
1915                 task->tk_rpc_status = -ENOTCONN;
1916                 rpc_exit(task, -ENOTCONN);
1917                 return;
1918         }
1919         ret = xs_local_setup_socket(transport);
1920         if (ret && !RPC_IS_SOFTCONN(task))
1921                 msleep_interruptible(15000);
1922 }
1923
1924 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1925 /*
1926  * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1927  * know that we have exclusive access to the socket), to guard against
1928  * races with xs_reset_transport.
1929  */
1930 static void xs_set_memalloc(struct rpc_xprt *xprt)
1931 {
1932         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1933                         xprt);
1934
1935         /*
1936          * If there's no sock, then we have nothing to set. The
1937          * reconnecting process will get it for us.
1938          */
1939         if (!transport->inet)
1940                 return;
1941         if (atomic_read(&xprt->swapper))
1942                 sk_set_memalloc(transport->inet);
1943 }
1944
1945 /**
1946  * xs_enable_swap - Tag this transport as being used for swap.
1947  * @xprt: transport to tag
1948  *
1949  * Take a reference to this transport on behalf of the rpc_clnt, and
1950  * optionally mark it for swapping if it wasn't already.
1951  */
1952 static int
1953 xs_enable_swap(struct rpc_xprt *xprt)
1954 {
1955         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
1956
1957         if (atomic_inc_return(&xprt->swapper) != 1)
1958                 return 0;
1959         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1960                 return -ERESTARTSYS;
1961         if (xs->inet)
1962                 sk_set_memalloc(xs->inet);
1963         xprt_release_xprt(xprt, NULL);
1964         return 0;
1965 }
1966
1967 /**
1968  * xs_disable_swap - Untag this transport as being used for swap.
1969  * @xprt: transport to tag
1970  *
1971  * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
1972  * swapper refcount goes to 0, untag the socket as a memalloc socket.
1973  */
1974 static void
1975 xs_disable_swap(struct rpc_xprt *xprt)
1976 {
1977         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
1978
1979         if (!atomic_dec_and_test(&xprt->swapper))
1980                 return;
1981         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
1982                 return;
1983         if (xs->inet)
1984                 sk_clear_memalloc(xs->inet);
1985         xprt_release_xprt(xprt, NULL);
1986 }
1987 #else
1988 static void xs_set_memalloc(struct rpc_xprt *xprt)
1989 {
1990 }
1991
1992 static int
1993 xs_enable_swap(struct rpc_xprt *xprt)
1994 {
1995         return -EINVAL;
1996 }
1997
1998 static void
1999 xs_disable_swap(struct rpc_xprt *xprt)
2000 {
2001 }
2002 #endif
2003
2004 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2005 {
2006         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2007
2008         if (!transport->inet) {
2009                 struct sock *sk = sock->sk;
2010
2011                 write_lock_bh(&sk->sk_callback_lock);
2012
2013                 xs_save_old_callbacks(transport, sk);
2014
2015                 sk->sk_user_data = xprt;
2016                 sk->sk_data_ready = xs_data_ready;
2017                 sk->sk_write_space = xs_udp_write_space;
2018                 sock_set_flag(sk, SOCK_FASYNC);
2019
2020                 xprt_set_connected(xprt);
2021
2022                 /* Reset to new socket */
2023                 transport->sock = sock;
2024                 transport->inet = sk;
2025
2026                 xs_set_memalloc(xprt);
2027
2028                 write_unlock_bh(&sk->sk_callback_lock);
2029         }
2030         xs_udp_do_set_buffer_size(xprt);
2031
2032         xprt->stat.connect_start = jiffies;
2033 }
2034
2035 static void xs_udp_setup_socket(struct work_struct *work)
2036 {
2037         struct sock_xprt *transport =
2038                 container_of(work, struct sock_xprt, connect_worker.work);
2039         struct rpc_xprt *xprt = &transport->xprt;
2040         struct socket *sock;
2041         int status = -EIO;
2042
2043         sock = xs_create_sock(xprt, transport,
2044                         xs_addr(xprt)->sa_family, SOCK_DGRAM,
2045                         IPPROTO_UDP, false);
2046         if (IS_ERR(sock))
2047                 goto out;
2048
2049         dprintk("RPC:       worker connecting xprt %p via %s to "
2050                                 "%s (port %s)\n", xprt,
2051                         xprt->address_strings[RPC_DISPLAY_PROTO],
2052                         xprt->address_strings[RPC_DISPLAY_ADDR],
2053                         xprt->address_strings[RPC_DISPLAY_PORT]);
2054
2055         xs_udp_finish_connecting(xprt, sock);
2056         trace_rpc_socket_connect(xprt, sock, 0);
2057         status = 0;
2058 out:
2059         xprt_clear_connecting(xprt);
2060         xprt_unlock_connect(xprt, transport);
2061         xprt_wake_pending_tasks(xprt, status);
2062 }
2063
2064 /**
2065  * xs_tcp_shutdown - gracefully shut down a TCP socket
2066  * @xprt: transport
2067  *
2068  * Initiates a graceful shutdown of the TCP socket by calling the
2069  * equivalent of shutdown(SHUT_RDWR);
2070  */
2071 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2072 {
2073         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2074         struct socket *sock = transport->sock;
2075         int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2076
2077         if (sock == NULL)
2078                 return;
2079         switch (skst) {
2080         default:
2081                 kernel_sock_shutdown(sock, SHUT_RDWR);
2082                 trace_rpc_socket_shutdown(xprt, sock);
2083                 break;
2084         case TCP_CLOSE:
2085         case TCP_TIME_WAIT:
2086                 xs_reset_transport(transport);
2087         }
2088 }
2089
2090 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2091                 struct socket *sock)
2092 {
2093         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2094         unsigned int keepidle;
2095         unsigned int keepcnt;
2096         unsigned int timeo;
2097
2098         spin_lock(&xprt->transport_lock);
2099         keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2100         keepcnt = xprt->timeout->to_retries + 1;
2101         timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2102                 (xprt->timeout->to_retries + 1);
2103         clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2104         spin_unlock(&xprt->transport_lock);
2105
2106         /* TCP Keepalive options */
2107         sock_set_keepalive(sock->sk);
2108         tcp_sock_set_keepidle(sock->sk, keepidle);
2109         tcp_sock_set_keepintvl(sock->sk, keepidle);
2110         tcp_sock_set_keepcnt(sock->sk, keepcnt);
2111
2112         /* TCP user timeout (see RFC5482) */
2113         tcp_sock_set_user_timeout(sock->sk, timeo);
2114 }
2115
2116 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2117                 unsigned long connect_timeout,
2118                 unsigned long reconnect_timeout)
2119 {
2120         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2121         struct rpc_timeout to;
2122         unsigned long initval;
2123
2124         spin_lock(&xprt->transport_lock);
2125         if (reconnect_timeout < xprt->max_reconnect_timeout)
2126                 xprt->max_reconnect_timeout = reconnect_timeout;
2127         if (connect_timeout < xprt->connect_timeout) {
2128                 memcpy(&to, xprt->timeout, sizeof(to));
2129                 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2130                 /* Arbitrary lower limit */
2131                 if (initval <  XS_TCP_INIT_REEST_TO << 1)
2132                         initval = XS_TCP_INIT_REEST_TO << 1;
2133                 to.to_initval = initval;
2134                 to.to_maxval = initval;
2135                 memcpy(&transport->tcp_timeout, &to,
2136                                 sizeof(transport->tcp_timeout));
2137                 xprt->timeout = &transport->tcp_timeout;
2138                 xprt->connect_timeout = connect_timeout;
2139         }
2140         set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2141         spin_unlock(&xprt->transport_lock);
2142 }
2143
2144 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2145 {
2146         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2147         int ret = -ENOTCONN;
2148
2149         if (!transport->inet) {
2150                 struct sock *sk = sock->sk;
2151
2152                 /* Avoid temporary address, they are bad for long-lived
2153                  * connections such as NFS mounts.
2154                  * RFC4941, section 3.6 suggests that:
2155                  *    Individual applications, which have specific
2156                  *    knowledge about the normal duration of connections,
2157                  *    MAY override this as appropriate.
2158                  */
2159                 if (xs_addr(xprt)->sa_family == PF_INET6) {
2160                         ip6_sock_set_addr_preferences(sk,
2161                                 IPV6_PREFER_SRC_PUBLIC);
2162                 }
2163
2164                 xs_tcp_set_socket_timeouts(xprt, sock);
2165
2166                 write_lock_bh(&sk->sk_callback_lock);
2167
2168                 xs_save_old_callbacks(transport, sk);
2169
2170                 sk->sk_user_data = xprt;
2171                 sk->sk_data_ready = xs_data_ready;
2172                 sk->sk_state_change = xs_tcp_state_change;
2173                 sk->sk_write_space = xs_tcp_write_space;
2174                 sock_set_flag(sk, SOCK_FASYNC);
2175                 sk->sk_error_report = xs_error_report;
2176
2177                 /* socket options */
2178                 sock_reset_flag(sk, SOCK_LINGER);
2179                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2180
2181                 xprt_clear_connected(xprt);
2182
2183                 /* Reset to new socket */
2184                 transport->sock = sock;
2185                 transport->inet = sk;
2186
2187                 write_unlock_bh(&sk->sk_callback_lock);
2188         }
2189
2190         if (!xprt_bound(xprt))
2191                 goto out;
2192
2193         xs_set_memalloc(xprt);
2194
2195         xs_stream_start_connect(transport);
2196
2197         /* Tell the socket layer to start connecting... */
2198         set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2199         ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2200         switch (ret) {
2201         case 0:
2202                 xs_set_srcport(transport, sock);
2203                 fallthrough;
2204         case -EINPROGRESS:
2205                 /* SYN_SENT! */
2206                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2207                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2208                 break;
2209         case -EADDRNOTAVAIL:
2210                 /* Source port number is unavailable. Try a new one! */
2211                 transport->srcport = 0;
2212         }
2213 out:
2214         return ret;
2215 }
2216
2217 /**
2218  * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2219  * @work: queued work item
2220  *
2221  * Invoked by a work queue tasklet.
2222  */
2223 static void xs_tcp_setup_socket(struct work_struct *work)
2224 {
2225         struct sock_xprt *transport =
2226                 container_of(work, struct sock_xprt, connect_worker.work);
2227         struct socket *sock = transport->sock;
2228         struct rpc_xprt *xprt = &transport->xprt;
2229         int status = -EIO;
2230
2231         if (!sock) {
2232                 sock = xs_create_sock(xprt, transport,
2233                                 xs_addr(xprt)->sa_family, SOCK_STREAM,
2234                                 IPPROTO_TCP, true);
2235                 if (IS_ERR(sock)) {
2236                         status = PTR_ERR(sock);
2237                         goto out;
2238                 }
2239         }
2240
2241         dprintk("RPC:       worker connecting xprt %p via %s to "
2242                                 "%s (port %s)\n", xprt,
2243                         xprt->address_strings[RPC_DISPLAY_PROTO],
2244                         xprt->address_strings[RPC_DISPLAY_ADDR],
2245                         xprt->address_strings[RPC_DISPLAY_PORT]);
2246
2247         status = xs_tcp_finish_connecting(xprt, sock);
2248         trace_rpc_socket_connect(xprt, sock, status);
2249         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
2250                         xprt, -status, xprt_connected(xprt),
2251                         sock->sk->sk_state);
2252         switch (status) {
2253         default:
2254                 printk("%s: connect returned unhandled error %d\n",
2255                         __func__, status);
2256                 fallthrough;
2257         case -EADDRNOTAVAIL:
2258                 /* We're probably in TIME_WAIT. Get rid of existing socket,
2259                  * and retry
2260                  */
2261                 xs_tcp_force_close(xprt);
2262                 break;
2263         case 0:
2264         case -EINPROGRESS:
2265         case -EALREADY:
2266                 xprt_unlock_connect(xprt, transport);
2267                 return;
2268         case -EINVAL:
2269                 /* Happens, for instance, if the user specified a link
2270                  * local IPv6 address without a scope-id.
2271                  */
2272         case -ECONNREFUSED:
2273         case -ECONNRESET:
2274         case -ENETDOWN:
2275         case -ENETUNREACH:
2276         case -EHOSTUNREACH:
2277         case -EADDRINUSE:
2278         case -ENOBUFS:
2279                 /*
2280                  * xs_tcp_force_close() wakes tasks with -EIO.
2281                  * We need to wake them first to ensure the
2282                  * correct error code.
2283                  */
2284                 xprt_wake_pending_tasks(xprt, status);
2285                 xs_tcp_force_close(xprt);
2286                 goto out;
2287         }
2288         status = -EAGAIN;
2289 out:
2290         xprt_clear_connecting(xprt);
2291         xprt_unlock_connect(xprt, transport);
2292         xprt_wake_pending_tasks(xprt, status);
2293 }
2294
2295 /**
2296  * xs_connect - connect a socket to a remote endpoint
2297  * @xprt: pointer to transport structure
2298  * @task: address of RPC task that manages state of connect request
2299  *
2300  * TCP: If the remote end dropped the connection, delay reconnecting.
2301  *
2302  * UDP socket connects are synchronous, but we use a work queue anyway
2303  * to guarantee that even unprivileged user processes can set up a
2304  * socket on a privileged port.
2305  *
2306  * If a UDP socket connect fails, the delay behavior here prevents
2307  * retry floods (hard mounts).
2308  */
2309 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2310 {
2311         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2312         unsigned long delay = 0;
2313
2314         WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2315
2316         if (transport->sock != NULL) {
2317                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
2318                                 "seconds\n",
2319                                 xprt, xprt->reestablish_timeout / HZ);
2320
2321                 /* Start by resetting any existing state */
2322                 xs_reset_transport(transport);
2323
2324                 delay = xprt_reconnect_delay(xprt);
2325                 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2326
2327         } else
2328                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
2329
2330         queue_delayed_work(xprtiod_workqueue,
2331                         &transport->connect_worker,
2332                         delay);
2333 }
2334
2335 static void xs_wake_disconnect(struct sock_xprt *transport)
2336 {
2337         if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2338                 xs_tcp_force_close(&transport->xprt);
2339 }
2340
2341 static void xs_wake_write(struct sock_xprt *transport)
2342 {
2343         if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2344                 xprt_write_space(&transport->xprt);
2345 }
2346
2347 static void xs_wake_error(struct sock_xprt *transport)
2348 {
2349         int sockerr;
2350
2351         if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2352                 return;
2353         mutex_lock(&transport->recv_mutex);
2354         if (transport->sock == NULL)
2355                 goto out;
2356         if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2357                 goto out;
2358         sockerr = xchg(&transport->xprt_err, 0);
2359         if (sockerr < 0)
2360                 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2361 out:
2362         mutex_unlock(&transport->recv_mutex);
2363 }
2364
2365 static void xs_wake_pending(struct sock_xprt *transport)
2366 {
2367         if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2368                 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2369 }
2370
2371 static void xs_error_handle(struct work_struct *work)
2372 {
2373         struct sock_xprt *transport = container_of(work,
2374                         struct sock_xprt, error_worker);
2375
2376         xs_wake_disconnect(transport);
2377         xs_wake_write(transport);
2378         xs_wake_error(transport);
2379         xs_wake_pending(transport);
2380 }
2381
2382 /**
2383  * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2384  * @xprt: rpc_xprt struct containing statistics
2385  * @seq: output file
2386  *
2387  */
2388 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2389 {
2390         long idle_time = 0;
2391
2392         if (xprt_connected(xprt))
2393                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2394
2395         seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2396                         "%llu %llu %lu %llu %llu\n",
2397                         xprt->stat.bind_count,
2398                         xprt->stat.connect_count,
2399                         xprt->stat.connect_time / HZ,
2400                         idle_time,
2401                         xprt->stat.sends,
2402                         xprt->stat.recvs,
2403                         xprt->stat.bad_xids,
2404                         xprt->stat.req_u,
2405                         xprt->stat.bklog_u,
2406                         xprt->stat.max_slots,
2407                         xprt->stat.sending_u,
2408                         xprt->stat.pending_u);
2409 }
2410
2411 /**
2412  * xs_udp_print_stats - display UDP socket-specifc stats
2413  * @xprt: rpc_xprt struct containing statistics
2414  * @seq: output file
2415  *
2416  */
2417 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2418 {
2419         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2420
2421         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2422                         "%lu %llu %llu\n",
2423                         transport->srcport,
2424                         xprt->stat.bind_count,
2425                         xprt->stat.sends,
2426                         xprt->stat.recvs,
2427                         xprt->stat.bad_xids,
2428                         xprt->stat.req_u,
2429                         xprt->stat.bklog_u,
2430                         xprt->stat.max_slots,
2431                         xprt->stat.sending_u,
2432                         xprt->stat.pending_u);
2433 }
2434
2435 /**
2436  * xs_tcp_print_stats - display TCP socket-specifc stats
2437  * @xprt: rpc_xprt struct containing statistics
2438  * @seq: output file
2439  *
2440  */
2441 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2442 {
2443         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2444         long idle_time = 0;
2445
2446         if (xprt_connected(xprt))
2447                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2448
2449         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2450                         "%llu %llu %lu %llu %llu\n",
2451                         transport->srcport,
2452                         xprt->stat.bind_count,
2453                         xprt->stat.connect_count,
2454                         xprt->stat.connect_time / HZ,
2455                         idle_time,
2456                         xprt->stat.sends,
2457                         xprt->stat.recvs,
2458                         xprt->stat.bad_xids,
2459                         xprt->stat.req_u,
2460                         xprt->stat.bklog_u,
2461                         xprt->stat.max_slots,
2462                         xprt->stat.sending_u,
2463                         xprt->stat.pending_u);
2464 }
2465
2466 /*
2467  * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2468  * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2469  * to use the server side send routines.
2470  */
2471 static int bc_malloc(struct rpc_task *task)
2472 {
2473         struct rpc_rqst *rqst = task->tk_rqstp;
2474         size_t size = rqst->rq_callsize;
2475         struct page *page;
2476         struct rpc_buffer *buf;
2477
2478         if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2479                 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2480                           size);
2481                 return -EINVAL;
2482         }
2483
2484         page = alloc_page(GFP_KERNEL);
2485         if (!page)
2486                 return -ENOMEM;
2487
2488         buf = page_address(page);
2489         buf->len = PAGE_SIZE;
2490
2491         rqst->rq_buffer = buf->data;
2492         rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2493         return 0;
2494 }
2495
2496 /*
2497  * Free the space allocated in the bc_alloc routine
2498  */
2499 static void bc_free(struct rpc_task *task)
2500 {
2501         void *buffer = task->tk_rqstp->rq_buffer;
2502         struct rpc_buffer *buf;
2503
2504         buf = container_of(buffer, struct rpc_buffer, data);
2505         free_page((unsigned long)buf);
2506 }
2507
2508 static int bc_sendto(struct rpc_rqst *req)
2509 {
2510         struct xdr_buf *xdr = &req->rq_snd_buf;
2511         struct sock_xprt *transport =
2512                         container_of(req->rq_xprt, struct sock_xprt, xprt);
2513         struct msghdr msg = {
2514                 .msg_flags      = 0,
2515         };
2516         rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2517                                          (u32)xdr->len);
2518         unsigned int sent = 0;
2519         int err;
2520
2521         req->rq_xtime = ktime_get();
2522         err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2523         xdr_free_bvec(xdr);
2524         if (err < 0 || sent != (xdr->len + sizeof(marker)))
2525                 return -EAGAIN;
2526         return sent;
2527 }
2528
2529 /**
2530  * bc_send_request - Send a backchannel Call on a TCP socket
2531  * @req: rpc_rqst containing Call message to be sent
2532  *
2533  * xpt_mutex ensures @rqstp's whole message is written to the socket
2534  * without interruption.
2535  *
2536  * Return values:
2537  *   %0 if the message was sent successfully
2538  *   %ENOTCONN if the message was not sent
2539  */
2540 static int bc_send_request(struct rpc_rqst *req)
2541 {
2542         struct svc_xprt *xprt;
2543         int len;
2544
2545         /*
2546          * Get the server socket associated with this callback xprt
2547          */
2548         xprt = req->rq_xprt->bc_xprt;
2549
2550         /*
2551          * Grab the mutex to serialize data as the connection is shared
2552          * with the fore channel
2553          */
2554         mutex_lock(&xprt->xpt_mutex);
2555         if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2556                 len = -ENOTCONN;
2557         else
2558                 len = bc_sendto(req);
2559         mutex_unlock(&xprt->xpt_mutex);
2560
2561         if (len > 0)
2562                 len = 0;
2563
2564         return len;
2565 }
2566
2567 /*
2568  * The close routine. Since this is client initiated, we do nothing
2569  */
2570
2571 static void bc_close(struct rpc_xprt *xprt)
2572 {
2573         xprt_disconnect_done(xprt);
2574 }
2575
2576 /*
2577  * The xprt destroy routine. Again, because this connection is client
2578  * initiated, we do nothing
2579  */
2580
2581 static void bc_destroy(struct rpc_xprt *xprt)
2582 {
2583         dprintk("RPC:       bc_destroy xprt %p\n", xprt);
2584
2585         xs_xprt_free(xprt);
2586         module_put(THIS_MODULE);
2587 }
2588
2589 static const struct rpc_xprt_ops xs_local_ops = {
2590         .reserve_xprt           = xprt_reserve_xprt,
2591         .release_xprt           = xprt_release_xprt,
2592         .alloc_slot             = xprt_alloc_slot,
2593         .free_slot              = xprt_free_slot,
2594         .rpcbind                = xs_local_rpcbind,
2595         .set_port               = xs_local_set_port,
2596         .connect                = xs_local_connect,
2597         .buf_alloc              = rpc_malloc,
2598         .buf_free               = rpc_free,
2599         .prepare_request        = xs_stream_prepare_request,
2600         .send_request           = xs_local_send_request,
2601         .wait_for_reply_request = xprt_wait_for_reply_request_def,
2602         .close                  = xs_close,
2603         .destroy                = xs_destroy,
2604         .print_stats            = xs_local_print_stats,
2605         .enable_swap            = xs_enable_swap,
2606         .disable_swap           = xs_disable_swap,
2607 };
2608
2609 static const struct rpc_xprt_ops xs_udp_ops = {
2610         .set_buffer_size        = xs_udp_set_buffer_size,
2611         .reserve_xprt           = xprt_reserve_xprt_cong,
2612         .release_xprt           = xprt_release_xprt_cong,
2613         .alloc_slot             = xprt_alloc_slot,
2614         .free_slot              = xprt_free_slot,
2615         .rpcbind                = rpcb_getport_async,
2616         .set_port               = xs_set_port,
2617         .connect                = xs_connect,
2618         .buf_alloc              = rpc_malloc,
2619         .buf_free               = rpc_free,
2620         .send_request           = xs_udp_send_request,
2621         .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2622         .timer                  = xs_udp_timer,
2623         .release_request        = xprt_release_rqst_cong,
2624         .close                  = xs_close,
2625         .destroy                = xs_destroy,
2626         .print_stats            = xs_udp_print_stats,
2627         .enable_swap            = xs_enable_swap,
2628         .disable_swap           = xs_disable_swap,
2629         .inject_disconnect      = xs_inject_disconnect,
2630 };
2631
2632 static const struct rpc_xprt_ops xs_tcp_ops = {
2633         .reserve_xprt           = xprt_reserve_xprt,
2634         .release_xprt           = xprt_release_xprt,
2635         .alloc_slot             = xprt_alloc_slot,
2636         .free_slot              = xprt_free_slot,
2637         .rpcbind                = rpcb_getport_async,
2638         .set_port               = xs_set_port,
2639         .connect                = xs_connect,
2640         .buf_alloc              = rpc_malloc,
2641         .buf_free               = rpc_free,
2642         .prepare_request        = xs_stream_prepare_request,
2643         .send_request           = xs_tcp_send_request,
2644         .wait_for_reply_request = xprt_wait_for_reply_request_def,
2645         .close                  = xs_tcp_shutdown,
2646         .destroy                = xs_destroy,
2647         .set_connect_timeout    = xs_tcp_set_connect_timeout,
2648         .print_stats            = xs_tcp_print_stats,
2649         .enable_swap            = xs_enable_swap,
2650         .disable_swap           = xs_disable_swap,
2651         .inject_disconnect      = xs_inject_disconnect,
2652 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2653         .bc_setup               = xprt_setup_bc,
2654         .bc_maxpayload          = xs_tcp_bc_maxpayload,
2655         .bc_num_slots           = xprt_bc_max_slots,
2656         .bc_free_rqst           = xprt_free_bc_rqst,
2657         .bc_destroy             = xprt_destroy_bc,
2658 #endif
2659 };
2660
2661 /*
2662  * The rpc_xprt_ops for the server backchannel
2663  */
2664
2665 static const struct rpc_xprt_ops bc_tcp_ops = {
2666         .reserve_xprt           = xprt_reserve_xprt,
2667         .release_xprt           = xprt_release_xprt,
2668         .alloc_slot             = xprt_alloc_slot,
2669         .free_slot              = xprt_free_slot,
2670         .buf_alloc              = bc_malloc,
2671         .buf_free               = bc_free,
2672         .send_request           = bc_send_request,
2673         .wait_for_reply_request = xprt_wait_for_reply_request_def,
2674         .close                  = bc_close,
2675         .destroy                = bc_destroy,
2676         .print_stats            = xs_tcp_print_stats,
2677         .enable_swap            = xs_enable_swap,
2678         .disable_swap           = xs_disable_swap,
2679         .inject_disconnect      = xs_inject_disconnect,
2680 };
2681
2682 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2683 {
2684         static const struct sockaddr_in sin = {
2685                 .sin_family             = AF_INET,
2686                 .sin_addr.s_addr        = htonl(INADDR_ANY),
2687         };
2688         static const struct sockaddr_in6 sin6 = {
2689                 .sin6_family            = AF_INET6,
2690                 .sin6_addr              = IN6ADDR_ANY_INIT,
2691         };
2692
2693         switch (family) {
2694         case AF_LOCAL:
2695                 break;
2696         case AF_INET:
2697                 memcpy(sap, &sin, sizeof(sin));
2698                 break;
2699         case AF_INET6:
2700                 memcpy(sap, &sin6, sizeof(sin6));
2701                 break;
2702         default:
2703                 dprintk("RPC:       %s: Bad address family\n", __func__);
2704                 return -EAFNOSUPPORT;
2705         }
2706         return 0;
2707 }
2708
2709 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2710                                       unsigned int slot_table_size,
2711                                       unsigned int max_slot_table_size)
2712 {
2713         struct rpc_xprt *xprt;
2714         struct sock_xprt *new;
2715
2716         if (args->addrlen > sizeof(xprt->addr)) {
2717                 dprintk("RPC:       xs_setup_xprt: address too large\n");
2718                 return ERR_PTR(-EBADF);
2719         }
2720
2721         xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2722                         max_slot_table_size);
2723         if (xprt == NULL) {
2724                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
2725                                 "rpc_xprt\n");
2726                 return ERR_PTR(-ENOMEM);
2727         }
2728
2729         new = container_of(xprt, struct sock_xprt, xprt);
2730         mutex_init(&new->recv_mutex);
2731         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2732         xprt->addrlen = args->addrlen;
2733         if (args->srcaddr)
2734                 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2735         else {
2736                 int err;
2737                 err = xs_init_anyaddr(args->dstaddr->sa_family,
2738                                         (struct sockaddr *)&new->srcaddr);
2739                 if (err != 0) {
2740                         xprt_free(xprt);
2741                         return ERR_PTR(err);
2742                 }
2743         }
2744
2745         return xprt;
2746 }
2747
2748 static const struct rpc_timeout xs_local_default_timeout = {
2749         .to_initval = 10 * HZ,
2750         .to_maxval = 10 * HZ,
2751         .to_retries = 2,
2752 };
2753
2754 /**
2755  * xs_setup_local - Set up transport to use an AF_LOCAL socket
2756  * @args: rpc transport creation arguments
2757  *
2758  * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2759  */
2760 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2761 {
2762         struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2763         struct sock_xprt *transport;
2764         struct rpc_xprt *xprt;
2765         struct rpc_xprt *ret;
2766
2767         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2768                         xprt_max_tcp_slot_table_entries);
2769         if (IS_ERR(xprt))
2770                 return xprt;
2771         transport = container_of(xprt, struct sock_xprt, xprt);
2772
2773         xprt->prot = 0;
2774         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2775
2776         xprt->bind_timeout = XS_BIND_TO;
2777         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2778         xprt->idle_timeout = XS_IDLE_DISC_TO;
2779
2780         xprt->ops = &xs_local_ops;
2781         xprt->timeout = &xs_local_default_timeout;
2782
2783         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2784         INIT_WORK(&transport->error_worker, xs_error_handle);
2785         INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2786
2787         switch (sun->sun_family) {
2788         case AF_LOCAL:
2789                 if (sun->sun_path[0] != '/') {
2790                         dprintk("RPC:       bad AF_LOCAL address: %s\n",
2791                                         sun->sun_path);
2792                         ret = ERR_PTR(-EINVAL);
2793                         goto out_err;
2794                 }
2795                 xprt_set_bound(xprt);
2796                 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2797                 ret = ERR_PTR(xs_local_setup_socket(transport));
2798                 if (ret)
2799                         goto out_err;
2800                 break;
2801         default:
2802                 ret = ERR_PTR(-EAFNOSUPPORT);
2803                 goto out_err;
2804         }
2805
2806         dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
2807                         xprt->address_strings[RPC_DISPLAY_ADDR]);
2808
2809         if (try_module_get(THIS_MODULE))
2810                 return xprt;
2811         ret = ERR_PTR(-EINVAL);
2812 out_err:
2813         xs_xprt_free(xprt);
2814         return ret;
2815 }
2816
2817 static const struct rpc_timeout xs_udp_default_timeout = {
2818         .to_initval = 5 * HZ,
2819         .to_maxval = 30 * HZ,
2820         .to_increment = 5 * HZ,
2821         .to_retries = 5,
2822 };
2823
2824 /**
2825  * xs_setup_udp - Set up transport to use a UDP socket
2826  * @args: rpc transport creation arguments
2827  *
2828  */
2829 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2830 {
2831         struct sockaddr *addr = args->dstaddr;
2832         struct rpc_xprt *xprt;
2833         struct sock_xprt *transport;
2834         struct rpc_xprt *ret;
2835
2836         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2837                         xprt_udp_slot_table_entries);
2838         if (IS_ERR(xprt))
2839                 return xprt;
2840         transport = container_of(xprt, struct sock_xprt, xprt);
2841
2842         xprt->prot = IPPROTO_UDP;
2843         /* XXX: header size can vary due to auth type, IPv6, etc. */
2844         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2845
2846         xprt->bind_timeout = XS_BIND_TO;
2847         xprt->reestablish_timeout = XS_UDP_REEST_TO;
2848         xprt->idle_timeout = XS_IDLE_DISC_TO;
2849
2850         xprt->ops = &xs_udp_ops;
2851
2852         xprt->timeout = &xs_udp_default_timeout;
2853
2854         INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2855         INIT_WORK(&transport->error_worker, xs_error_handle);
2856         INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2857
2858         switch (addr->sa_family) {
2859         case AF_INET:
2860                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2861                         xprt_set_bound(xprt);
2862
2863                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2864                 break;
2865         case AF_INET6:
2866                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2867                         xprt_set_bound(xprt);
2868
2869                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2870                 break;
2871         default:
2872                 ret = ERR_PTR(-EAFNOSUPPORT);
2873                 goto out_err;
2874         }
2875
2876         if (xprt_bound(xprt))
2877                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2878                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2879                                 xprt->address_strings[RPC_DISPLAY_PORT],
2880                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2881         else
2882                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2883                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2884                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2885
2886         if (try_module_get(THIS_MODULE))
2887                 return xprt;
2888         ret = ERR_PTR(-EINVAL);
2889 out_err:
2890         xs_xprt_free(xprt);
2891         return ret;
2892 }
2893
2894 static const struct rpc_timeout xs_tcp_default_timeout = {
2895         .to_initval = 60 * HZ,
2896         .to_maxval = 60 * HZ,
2897         .to_retries = 2,
2898 };
2899
2900 /**
2901  * xs_setup_tcp - Set up transport to use a TCP socket
2902  * @args: rpc transport creation arguments
2903  *
2904  */
2905 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2906 {
2907         struct sockaddr *addr = args->dstaddr;
2908         struct rpc_xprt *xprt;
2909         struct sock_xprt *transport;
2910         struct rpc_xprt *ret;
2911         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2912
2913         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2914                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2915
2916         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2917                         max_slot_table_size);
2918         if (IS_ERR(xprt))
2919                 return xprt;
2920         transport = container_of(xprt, struct sock_xprt, xprt);
2921
2922         xprt->prot = IPPROTO_TCP;
2923         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2924
2925         xprt->bind_timeout = XS_BIND_TO;
2926         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2927         xprt->idle_timeout = XS_IDLE_DISC_TO;
2928
2929         xprt->ops = &xs_tcp_ops;
2930         xprt->timeout = &xs_tcp_default_timeout;
2931
2932         xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
2933         xprt->connect_timeout = xprt->timeout->to_initval *
2934                 (xprt->timeout->to_retries + 1);
2935
2936         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2937         INIT_WORK(&transport->error_worker, xs_error_handle);
2938         INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2939
2940         switch (addr->sa_family) {
2941         case AF_INET:
2942                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2943                         xprt_set_bound(xprt);
2944
2945                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2946                 break;
2947         case AF_INET6:
2948                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2949                         xprt_set_bound(xprt);
2950
2951                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2952                 break;
2953         default:
2954                 ret = ERR_PTR(-EAFNOSUPPORT);
2955                 goto out_err;
2956         }
2957
2958         if (xprt_bound(xprt))
2959                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2960                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2961                                 xprt->address_strings[RPC_DISPLAY_PORT],
2962                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2963         else
2964                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2965                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2966                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2967
2968         if (try_module_get(THIS_MODULE))
2969                 return xprt;
2970         ret = ERR_PTR(-EINVAL);
2971 out_err:
2972         xs_xprt_free(xprt);
2973         return ret;
2974 }
2975
2976 /**
2977  * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2978  * @args: rpc transport creation arguments
2979  *
2980  */
2981 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2982 {
2983         struct sockaddr *addr = args->dstaddr;
2984         struct rpc_xprt *xprt;
2985         struct sock_xprt *transport;
2986         struct svc_sock *bc_sock;
2987         struct rpc_xprt *ret;
2988
2989         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2990                         xprt_tcp_slot_table_entries);
2991         if (IS_ERR(xprt))
2992                 return xprt;
2993         transport = container_of(xprt, struct sock_xprt, xprt);
2994
2995         xprt->prot = IPPROTO_TCP;
2996         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2997         xprt->timeout = &xs_tcp_default_timeout;
2998
2999         /* backchannel */
3000         xprt_set_bound(xprt);
3001         xprt->bind_timeout = 0;
3002         xprt->reestablish_timeout = 0;
3003         xprt->idle_timeout = 0;
3004
3005         xprt->ops = &bc_tcp_ops;
3006
3007         switch (addr->sa_family) {
3008         case AF_INET:
3009                 xs_format_peer_addresses(xprt, "tcp",
3010                                          RPCBIND_NETID_TCP);
3011                 break;
3012         case AF_INET6:
3013                 xs_format_peer_addresses(xprt, "tcp",
3014                                    RPCBIND_NETID_TCP6);
3015                 break;
3016         default:
3017                 ret = ERR_PTR(-EAFNOSUPPORT);
3018                 goto out_err;
3019         }
3020
3021         dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3022                         xprt->address_strings[RPC_DISPLAY_ADDR],
3023                         xprt->address_strings[RPC_DISPLAY_PORT],
3024                         xprt->address_strings[RPC_DISPLAY_PROTO]);
3025
3026         /*
3027          * Once we've associated a backchannel xprt with a connection,
3028          * we want to keep it around as long as the connection lasts,
3029          * in case we need to start using it for a backchannel again;
3030          * this reference won't be dropped until bc_xprt is destroyed.
3031          */
3032         xprt_get(xprt);
3033         args->bc_xprt->xpt_bc_xprt = xprt;
3034         xprt->bc_xprt = args->bc_xprt;
3035         bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3036         transport->sock = bc_sock->sk_sock;
3037         transport->inet = bc_sock->sk_sk;
3038
3039         /*
3040          * Since we don't want connections for the backchannel, we set
3041          * the xprt status to connected
3042          */
3043         xprt_set_connected(xprt);
3044
3045         if (try_module_get(THIS_MODULE))
3046                 return xprt;
3047
3048         args->bc_xprt->xpt_bc_xprt = NULL;
3049         args->bc_xprt->xpt_bc_xps = NULL;
3050         xprt_put(xprt);
3051         ret = ERR_PTR(-EINVAL);
3052 out_err:
3053         xs_xprt_free(xprt);
3054         return ret;
3055 }
3056
3057 static struct xprt_class        xs_local_transport = {
3058         .list           = LIST_HEAD_INIT(xs_local_transport.list),
3059         .name           = "named UNIX socket",
3060         .owner          = THIS_MODULE,
3061         .ident          = XPRT_TRANSPORT_LOCAL,
3062         .setup          = xs_setup_local,
3063         .netid          = { "" },
3064 };
3065
3066 static struct xprt_class        xs_udp_transport = {
3067         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
3068         .name           = "udp",
3069         .owner          = THIS_MODULE,
3070         .ident          = XPRT_TRANSPORT_UDP,
3071         .setup          = xs_setup_udp,
3072         .netid          = { "udp", "udp6", "" },
3073 };
3074
3075 static struct xprt_class        xs_tcp_transport = {
3076         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
3077         .name           = "tcp",
3078         .owner          = THIS_MODULE,
3079         .ident          = XPRT_TRANSPORT_TCP,
3080         .setup          = xs_setup_tcp,
3081         .netid          = { "tcp", "tcp6", "" },
3082 };
3083
3084 static struct xprt_class        xs_bc_tcp_transport = {
3085         .list           = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3086         .name           = "tcp NFSv4.1 backchannel",
3087         .owner          = THIS_MODULE,
3088         .ident          = XPRT_TRANSPORT_BC_TCP,
3089         .setup          = xs_setup_bc_tcp,
3090         .netid          = { "" },
3091 };
3092
3093 /**
3094  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3095  *
3096  */
3097 int init_socket_xprt(void)
3098 {
3099         if (!sunrpc_table_header)
3100                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3101
3102         xprt_register_transport(&xs_local_transport);
3103         xprt_register_transport(&xs_udp_transport);
3104         xprt_register_transport(&xs_tcp_transport);
3105         xprt_register_transport(&xs_bc_tcp_transport);
3106
3107         return 0;
3108 }
3109
3110 /**
3111  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3112  *
3113  */
3114 void cleanup_socket_xprt(void)
3115 {
3116         if (sunrpc_table_header) {
3117                 unregister_sysctl_table(sunrpc_table_header);
3118                 sunrpc_table_header = NULL;
3119         }
3120
3121         xprt_unregister_transport(&xs_local_transport);
3122         xprt_unregister_transport(&xs_udp_transport);
3123         xprt_unregister_transport(&xs_tcp_transport);
3124         xprt_unregister_transport(&xs_bc_tcp_transport);
3125 }
3126
3127 static int param_set_uint_minmax(const char *val,
3128                 const struct kernel_param *kp,
3129                 unsigned int min, unsigned int max)
3130 {
3131         unsigned int num;
3132         int ret;
3133
3134         if (!val)
3135                 return -EINVAL;
3136         ret = kstrtouint(val, 0, &num);
3137         if (ret)
3138                 return ret;
3139         if (num < min || num > max)
3140                 return -EINVAL;
3141         *((unsigned int *)kp->arg) = num;
3142         return 0;
3143 }
3144
3145 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3146 {
3147         return param_set_uint_minmax(val, kp,
3148                         RPC_MIN_RESVPORT,
3149                         RPC_MAX_RESVPORT);
3150 }
3151
3152 static const struct kernel_param_ops param_ops_portnr = {
3153         .set = param_set_portnr,
3154         .get = param_get_uint,
3155 };
3156
3157 #define param_check_portnr(name, p) \
3158         __param_check(name, p, unsigned int);
3159
3160 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3161 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3162
3163 static int param_set_slot_table_size(const char *val,
3164                                      const struct kernel_param *kp)
3165 {
3166         return param_set_uint_minmax(val, kp,
3167                         RPC_MIN_SLOT_TABLE,
3168                         RPC_MAX_SLOT_TABLE);
3169 }
3170
3171 static const struct kernel_param_ops param_ops_slot_table_size = {
3172         .set = param_set_slot_table_size,
3173         .get = param_get_uint,
3174 };
3175
3176 #define param_check_slot_table_size(name, p) \
3177         __param_check(name, p, unsigned int);
3178
3179 static int param_set_max_slot_table_size(const char *val,
3180                                      const struct kernel_param *kp)
3181 {
3182         return param_set_uint_minmax(val, kp,
3183                         RPC_MIN_SLOT_TABLE,
3184                         RPC_MAX_SLOT_TABLE_LIMIT);
3185 }
3186
3187 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3188         .set = param_set_max_slot_table_size,
3189         .get = param_get_uint,
3190 };
3191
3192 #define param_check_max_slot_table_size(name, p) \
3193         __param_check(name, p, unsigned int);
3194
3195 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3196                    slot_table_size, 0644);
3197 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3198                    max_slot_table_size, 0644);
3199 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3200                    slot_table_size, 0644);