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_set_srcport(struct sock_xprt *transport, struct socket *sock);
  62 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
  63                 struct socket *sock);
  64
  65 /*
  66  * xprtsock tunables
  67  */
  68 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  69 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
  70 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
  71
  72 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  73 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  74
  75 #define XS_TCP_LINGER_TO        (15U * HZ)
  76 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
  77
  78 /*
  79  * We can register our own files under /proc/sys/sunrpc by
  80  * calling register_sysctl_table() again.  The files in that
  81  * directory become the union of all files registered there.
  82  *
  83  * We simply need to make sure that we don't collide with
  84  * someone else's file names!
  85  */
  86
  87 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  88 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  89 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
  90 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  91 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  92
  93 static struct ctl_table_header *sunrpc_table_header;
  94
  95 static struct xprt_class xs_local_transport;
  96 static struct xprt_class xs_udp_transport;
  97 static struct xprt_class xs_tcp_transport;
  98 static struct xprt_class xs_bc_tcp_transport;
  99
 100 /*
 101  * FIXME: changing the UDP slot table size should also resize the UDP
 102  *        socket buffers for existing UDP transports
 103  */
 104 static struct ctl_table xs_tunables_table[] = {
 105         {
 106                 .procname       = "udp_slot_table_entries",
 107                 .data           = &xprt_udp_slot_table_entries,
 108                 .maxlen         = sizeof(unsigned int),
 109                 .mode           = 0644,
 110                 .proc_handler   = proc_dointvec_minmax,
 111                 .extra1         = &min_slot_table_size,
 112                 .extra2         = &max_slot_table_size
 113         },
 114         {
 115                 .procname       = "tcp_slot_table_entries",
 116                 .data           = &xprt_tcp_slot_table_entries,
 117                 .maxlen         = sizeof(unsigned int),
 118                 .mode           = 0644,
 119                 .proc_handler   = proc_dointvec_minmax,
 120                 .extra1         = &min_slot_table_size,
 121                 .extra2         = &max_slot_table_size
 122         },
 123         {
 124                 .procname       = "tcp_max_slot_table_entries",
 125                 .data           = &xprt_max_tcp_slot_table_entries,
 126                 .maxlen         = sizeof(unsigned int),
 127                 .mode           = 0644,
 128                 .proc_handler   = proc_dointvec_minmax,
 129                 .extra1         = &min_slot_table_size,
 130                 .extra2         = &max_tcp_slot_table_limit
 131         },
 132         {
 133                 .procname       = "min_resvport",
 134                 .data           = &xprt_min_resvport,
 135                 .maxlen         = sizeof(unsigned int),
 136                 .mode           = 0644,
 137                 .proc_handler   = proc_dointvec_minmax,
 138                 .extra1         = &xprt_min_resvport_limit,
 139                 .extra2         = &xprt_max_resvport_limit
 140         },
 141         {
 142                 .procname       = "max_resvport",
 143                 .data           = &xprt_max_resvport,
 144                 .maxlen         = sizeof(unsigned int),
 145                 .mode           = 0644,
 146                 .proc_handler   = proc_dointvec_minmax,
 147                 .extra1         = &xprt_min_resvport_limit,
 148                 .extra2         = &xprt_max_resvport_limit
 149         },
 150         {
 151                 .procname       = "tcp_fin_timeout",
 152                 .data           = &xs_tcp_fin_timeout,
 153                 .maxlen         = sizeof(xs_tcp_fin_timeout),
 154                 .mode           = 0644,
 155                 .proc_handler   = proc_dointvec_jiffies,
 156         },
 157         { },
 158 };
 159
 160 static struct ctl_table sunrpc_table[] = {
 161         {
 162                 .procname       = "sunrpc",
 163                 .mode           = 0555,
 164                 .child          = xs_tunables_table
 165         },
 166         { },
 167 };
 168
 169 /*
 170  * Wait duration for a reply from the RPC portmapper.
 171  */
 172 #define XS_BIND_TO              (60U * HZ)
 173
 174 /*
 175  * Delay if a UDP socket connect error occurs.  This is most likely some
 176  * kind of resource problem on the local host.
 177  */
 178 #define XS_UDP_REEST_TO         (2U * HZ)
 179
 180 /*
 181  * The reestablish timeout allows clients to delay for a bit before attempting
 182  * to reconnect to a server that just dropped our connection.
 183  *
 184  * We implement an exponential backoff when trying to reestablish a TCP
 185  * transport connection with the server.  Some servers like to drop a TCP
 186  * connection when they are overworked, so we start with a short timeout and
 187  * increase over time if the server is down or not responding.
 188  */
 189 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
 190
 191 /*
 192  * TCP idle timeout; client drops the transport socket if it is idle
 193  * for this long.  Note that we also timeout UDP sockets to prevent
 194  * holding port numbers when there is no RPC traffic.
 195  */
 196 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 197
 198 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 199 # undef  RPC_DEBUG_DATA
 200 # define RPCDBG_FACILITY        RPCDBG_TRANS
 201 #endif
 202
 203 #ifdef RPC_DEBUG_DATA
 204 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 205 {
 206         u8 *buf = (u8 *) packet;
 207         int j;
 208
 209         dprintk("RPC:       %s\n", msg);
 210         for (j = 0; j < count && j < 128; j += 4) {
 211                 if (!(j & 31)) {
 212                         if (j)
 213                                 dprintk("\n");
 214                         dprintk("0x%04x ", j);
 215                 }
 216                 dprintk("%02x%02x%02x%02x ",
 217                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
 218         }
 219         dprintk("\n");
 220 }
 221 #else
 222 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 223 {
 224         /* NOP */
 225 }
 226 #endif
 227
 228 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 229 {
 230         return (struct rpc_xprt *) sk->sk_user_data;
 231 }
 232
 233 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 234 {
 235         return (struct sockaddr *) &xprt->addr;
 236 }
 237
 238 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
 239 {
 240         return (struct sockaddr_un *) &xprt->addr;
 241 }
 242
 243 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
 244 {
 245         return (struct sockaddr_in *) &xprt->addr;
 246 }
 247
 248 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
 249 {
 250         return (struct sockaddr_in6 *) &xprt->addr;
 251 }
 252
 253 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
 254 {
 255         struct sockaddr *sap = xs_addr(xprt);
 256         struct sockaddr_in6 *sin6;
 257         struct sockaddr_in *sin;
 258         struct sockaddr_un *sun;
 259         char buf[128];
 260
 261         switch (sap->sa_family) {
 262         case AF_LOCAL:
 263                 sun = xs_addr_un(xprt);
 264                 strlcpy(buf, sun->sun_path, sizeof(buf));
 265                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 266                                                 kstrdup(buf, GFP_KERNEL);
 267                 break;
 268         case AF_INET:
 269                 (void)rpc_ntop(sap, buf, sizeof(buf));
 270                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 271                                                 kstrdup(buf, GFP_KERNEL);
 272                 sin = xs_addr_in(xprt);
 273                 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
 274                 break;
 275         case AF_INET6:
 276                 (void)rpc_ntop(sap, buf, sizeof(buf));
 277                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 278                                                 kstrdup(buf, GFP_KERNEL);
 279                 sin6 = xs_addr_in6(xprt);
 280                 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
 281                 break;
 282         default:
 283                 BUG();
 284         }
 285
 286         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
 287 }
 288
 289 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
 290 {
 291         struct sockaddr *sap = xs_addr(xprt);
 292         char buf[128];
 293
 294         snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
 295         xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
 296
 297         snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
 298         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
 299 }
 300
 301 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
 302                                      const char *protocol,
 303                                      const char *netid)
 304 {
 305         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 306         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 307         xs_format_common_peer_addresses(xprt);
 308         xs_format_common_peer_ports(xprt);
 309 }
 310
 311 static void xs_update_peer_port(struct rpc_xprt *xprt)
 312 {
 313         kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
 314         kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
 315
 316         xs_format_common_peer_ports(xprt);
 317 }
 318
 319 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 320 {
 321         unsigned int i;
 322
 323         for (i = 0; i < RPC_DISPLAY_MAX; i++)
 324                 switch (i) {
 325                 case RPC_DISPLAY_PROTO:
 326                 case RPC_DISPLAY_NETID:
 327                         continue;
 328                 default:
 329                         kfree(xprt->address_strings[i]);
 330                 }
 331 }
 332
 333 static size_t
 334 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
 335 {
 336         size_t i,n;
 337
 338         if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
 339                 return want;
 340         n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
 341         for (i = 0; i < n; i++) {
 342                 if (buf->pages[i])
 343                         continue;
 344                 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
 345                 if (!buf->pages[i]) {
 346                         i *= PAGE_SIZE;
 347                         return i > buf->page_base ? i - buf->page_base : 0;
 348                 }
 349         }
 350         return want;
 351 }
 352
 353 static ssize_t
 354 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
 355 {
 356         ssize_t ret;
 357         if (seek != 0)
 358                 iov_iter_advance(&msg->msg_iter, seek);
 359         ret = sock_recvmsg(sock, msg, flags);
 360         return ret > 0 ? ret + seek : ret;
 361 }
 362
 363 static ssize_t
 364 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
 365                 struct kvec *kvec, size_t count, size_t seek)
 366 {
 367         iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count);
 368         return xs_sock_recvmsg(sock, msg, flags, seek);
 369 }
 370
 371 static ssize_t
 372 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
 373                 struct bio_vec *bvec, unsigned long nr, size_t count,
 374                 size_t seek)
 375 {
 376         iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count);
 377         return xs_sock_recvmsg(sock, msg, flags, seek);
 378 }
 379
 380 static ssize_t
 381 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
 382                 size_t count)
 383 {
 384         iov_iter_discard(&msg->msg_iter, READ, count);
 385         return sock_recvmsg(sock, msg, flags);
 386 }
 387
 388 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 389 static void
 390 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
 391 {
 392         struct bvec_iter bi = {
 393                 .bi_size = count,
 394         };
 395         struct bio_vec bv;
 396
 397         bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
 398         for_each_bvec(bv, bvec, bi, bi)
 399                 flush_dcache_page(bv.bv_page);
 400 }
 401 #else
 402 static inline void
 403 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
 404 {
 405 }
 406 #endif
 407
 408 static ssize_t
 409 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
 410                 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
 411 {
 412         size_t want, seek_init = seek, offset = 0;
 413         ssize_t ret;
 414
 415         want = min_t(size_t, count, buf->head[0].iov_len);
 416         if (seek < want) {
 417                 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
 418                 if (ret <= 0)
 419                         goto sock_err;
 420                 offset += ret;
 421                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 422                         goto out;
 423                 if (ret != want)
 424                         goto out;
 425                 seek = 0;
 426         } else {
 427                 seek -= want;
 428                 offset += want;
 429         }
 430
 431         want = xs_alloc_sparse_pages(buf,
 432                         min_t(size_t, count - offset, buf->page_len),
 433                         GFP_KERNEL);
 434         if (seek < want) {
 435                 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
 436                                 xdr_buf_pagecount(buf),
 437                                 want + buf->page_base,
 438                                 seek + buf->page_base);
 439                 if (ret <= 0)
 440                         goto sock_err;
 441                 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
 442                 ret -= buf->page_base;
 443                 offset += ret;
 444                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 445                         goto out;
 446                 if (ret != want)
 447                         goto out;
 448                 seek = 0;
 449         } else {
 450                 seek -= want;
 451                 offset += want;
 452         }
 453
 454         want = min_t(size_t, count - offset, buf->tail[0].iov_len);
 455         if (seek < want) {
 456                 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
 457                 if (ret <= 0)
 458                         goto sock_err;
 459                 offset += ret;
 460                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 461                         goto out;
 462                 if (ret != want)
 463                         goto out;
 464         } else if (offset < seek_init)
 465                 offset = seek_init;
 466         ret = -EMSGSIZE;
 467 out:
 468         *read = offset - seek_init;
 469         return ret;
 470 sock_err:
 471         offset += seek;
 472         goto out;
 473 }
 474
 475 static void
 476 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
 477 {
 478         if (!transport->recv.copied) {
 479                 if (buf->head[0].iov_len >= transport->recv.offset)
 480                         memcpy(buf->head[0].iov_base,
 481                                         &transport->recv.xid,
 482                                         transport->recv.offset);
 483                 transport->recv.copied = transport->recv.offset;
 484         }
 485 }
 486
 487 static bool
 488 xs_read_stream_request_done(struct sock_xprt *transport)
 489 {
 490         return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
 491 }
 492
 493 static void
 494 xs_read_stream_check_eor(struct sock_xprt *transport,
 495                 struct msghdr *msg)
 496 {
 497         if (xs_read_stream_request_done(transport))
 498                 msg->msg_flags |= MSG_EOR;
 499 }
 500
 501 static ssize_t
 502 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
 503                 int flags, struct rpc_rqst *req)
 504 {
 505         struct xdr_buf *buf = &req->rq_private_buf;
 506         size_t want, read;
 507         ssize_t ret;
 508
 509         xs_read_header(transport, buf);
 510
 511         want = transport->recv.len - transport->recv.offset;
 512         if (want != 0) {
 513                 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
 514                                 transport->recv.copied + want,
 515                                 transport->recv.copied,
 516                                 &read);
 517                 transport->recv.offset += read;
 518                 transport->recv.copied += read;
 519         }
 520
 521         if (transport->recv.offset == transport->recv.len)
 522                 xs_read_stream_check_eor(transport, msg);
 523
 524         if (want == 0)
 525                 return 0;
 526
 527         switch (ret) {
 528         default:
 529                 break;
 530         case -EFAULT:
 531         case -EMSGSIZE:
 532                 msg->msg_flags |= MSG_TRUNC;
 533                 return read;
 534         case 0:
 535                 return -ESHUTDOWN;
 536         }
 537         return ret < 0 ? ret : read;
 538 }
 539
 540 static size_t
 541 xs_read_stream_headersize(bool isfrag)
 542 {
 543         if (isfrag)
 544                 return sizeof(__be32);
 545         return 3 * sizeof(__be32);
 546 }
 547
 548 static ssize_t
 549 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
 550                 int flags, size_t want, size_t seek)
 551 {
 552         struct kvec kvec = {
 553                 .iov_base = &transport->recv.fraghdr,
 554                 .iov_len = want,
 555         };
 556         return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
 557 }
 558
 559 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 560 static ssize_t
 561 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
 562 {
 563         struct rpc_xprt *xprt = &transport->xprt;
 564         struct rpc_rqst *req;
 565         ssize_t ret;
 566
 567         /* Is this transport associated with the backchannel? */
 568         if (!xprt->bc_serv)
 569                 return -ESHUTDOWN;
 570
 571         /* Look up and lock the request corresponding to the given XID */
 572         req = xprt_lookup_bc_request(xprt, transport->recv.xid);
 573         if (!req) {
 574                 printk(KERN_WARNING "Callback slot table overflowed\n");
 575                 return -ESHUTDOWN;
 576         }
 577         if (transport->recv.copied && !req->rq_private_buf.len)
 578                 return -ESHUTDOWN;
 579
 580         ret = xs_read_stream_request(transport, msg, flags, req);
 581         if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 582                 xprt_complete_bc_request(req, transport->recv.copied);
 583         else
 584                 req->rq_private_buf.len = transport->recv.copied;
 585
 586         return ret;
 587 }
 588 #else /* CONFIG_SUNRPC_BACKCHANNEL */
 589 static ssize_t
 590 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
 591 {
 592         return -ESHUTDOWN;
 593 }
 594 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 595
 596 static ssize_t
 597 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
 598 {
 599         struct rpc_xprt *xprt = &transport->xprt;
 600         struct rpc_rqst *req;
 601         ssize_t ret = 0;
 602
 603         /* Look up and lock the request corresponding to the given XID */
 604         spin_lock(&xprt->queue_lock);
 605         req = xprt_lookup_rqst(xprt, transport->recv.xid);
 606         if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
 607                 msg->msg_flags |= MSG_TRUNC;
 608                 goto out;
 609         }
 610         xprt_pin_rqst(req);
 611         spin_unlock(&xprt->queue_lock);
 612
 613         ret = xs_read_stream_request(transport, msg, flags, req);
 614
 615         spin_lock(&xprt->queue_lock);
 616         if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 617                 xprt_complete_rqst(req->rq_task, transport->recv.copied);
 618         else
 619                 req->rq_private_buf.len = transport->recv.copied;
 620         xprt_unpin_rqst(req);
 621 out:
 622         spin_unlock(&xprt->queue_lock);
 623         return ret;
 624 }
 625
 626 static ssize_t
 627 xs_read_stream(struct sock_xprt *transport, int flags)
 628 {
 629         struct msghdr msg = { 0 };
 630         size_t want, read = 0;
 631         ssize_t ret = 0;
 632
 633         if (transport->recv.len == 0) {
 634                 want = xs_read_stream_headersize(transport->recv.copied != 0);
 635                 ret = xs_read_stream_header(transport, &msg, flags, want,
 636                                 transport->recv.offset);
 637                 if (ret <= 0)
 638                         goto out_err;
 639                 transport->recv.offset = ret;
 640                 if (transport->recv.offset != want)
 641                         return transport->recv.offset;
 642                 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
 643                         RPC_FRAGMENT_SIZE_MASK;
 644                 transport->recv.offset -= sizeof(transport->recv.fraghdr);
 645                 read = ret;
 646         }
 647
 648         switch (be32_to_cpu(transport->recv.calldir)) {
 649         default:
 650                 msg.msg_flags |= MSG_TRUNC;
 651                 break;
 652         case RPC_CALL:
 653                 ret = xs_read_stream_call(transport, &msg, flags);
 654                 break;
 655         case RPC_REPLY:
 656                 ret = xs_read_stream_reply(transport, &msg, flags);
 657         }
 658         if (msg.msg_flags & MSG_TRUNC) {
 659                 transport->recv.calldir = cpu_to_be32(-1);
 660                 transport->recv.copied = -1;
 661         }
 662         if (ret < 0)
 663                 goto out_err;
 664         read += ret;
 665         if (transport->recv.offset < transport->recv.len) {
 666                 if (!(msg.msg_flags & MSG_TRUNC))
 667                         return read;
 668                 msg.msg_flags = 0;
 669                 ret = xs_read_discard(transport->sock, &msg, flags,
 670                                 transport->recv.len - transport->recv.offset);
 671                 if (ret <= 0)
 672                         goto out_err;
 673                 transport->recv.offset += ret;
 674                 read += ret;
 675                 if (transport->recv.offset != transport->recv.len)
 676                         return read;
 677         }
 678         if (xs_read_stream_request_done(transport)) {
 679                 trace_xs_stream_read_request(transport);
 680                 transport->recv.copied = 0;
 681         }
 682         transport->recv.offset = 0;
 683         transport->recv.len = 0;
 684         return read;
 685 out_err:
 686         return ret != 0 ? ret : -ESHUTDOWN;
 687 }
 688
 689 static __poll_t xs_poll_socket(struct sock_xprt *transport)
 690 {
 691         return transport->sock->ops->poll(transport->file, transport->sock,
 692                         NULL);
 693 }
 694
 695 static bool xs_poll_socket_readable(struct sock_xprt *transport)
 696 {
 697         __poll_t events = xs_poll_socket(transport);
 698
 699         return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
 700 }
 701
 702 static void xs_poll_check_readable(struct sock_xprt *transport)
 703 {
 704
 705         clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
 706         if (!xs_poll_socket_readable(transport))
 707                 return;
 708         if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
 709                 queue_work(xprtiod_workqueue, &transport->recv_worker);
 710 }
 711
 712 static void xs_stream_data_receive(struct sock_xprt *transport)
 713 {
 714         size_t read = 0;
 715         ssize_t ret = 0;
 716
 717         mutex_lock(&transport->recv_mutex);
 718         if (transport->sock == NULL)
 719                 goto out;
 720         for (;;) {
 721                 ret = xs_read_stream(transport, MSG_DONTWAIT);
 722                 if (ret < 0)
 723                         break;
 724                 read += ret;
 725                 cond_resched();
 726         }
 727         if (ret == -ESHUTDOWN)
 728                 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
 729         else
 730                 xs_poll_check_readable(transport);
 731 out:
 732         mutex_unlock(&transport->recv_mutex);
 733         trace_xs_stream_read_data(&transport->xprt, ret, read);
 734 }
 735
 736 static void xs_stream_data_receive_workfn(struct work_struct *work)
 737 {
 738         struct sock_xprt *transport =
 739                 container_of(work, struct sock_xprt, recv_worker);
 740         unsigned int pflags = memalloc_nofs_save();
 741
 742         xs_stream_data_receive(transport);
 743         memalloc_nofs_restore(pflags);
 744 }
 745
 746 static void
 747 xs_stream_reset_connect(struct sock_xprt *transport)
 748 {
 749         transport->recv.offset = 0;
 750         transport->recv.len = 0;
 751         transport->recv.copied = 0;
 752         transport->xmit.offset = 0;
 753 }
 754
 755 static void
 756 xs_stream_start_connect(struct sock_xprt *transport)
 757 {
 758         transport->xprt.stat.connect_count++;
 759         transport->xprt.stat.connect_start = jiffies;
 760 }
 761
 762 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 763
 764 /**
 765  * xs_nospace - handle transmit was incomplete
 766  * @req: pointer to RPC request
 767  * @transport: pointer to struct sock_xprt
 768  *
 769  */
 770 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
 771 {
 772         struct rpc_xprt *xprt = &transport->xprt;
 773         struct sock *sk = transport->inet;
 774         int ret = -EAGAIN;
 775
 776         trace_rpc_socket_nospace(req, transport);
 777
 778         /* Protect against races with write_space */
 779         spin_lock(&xprt->transport_lock);
 780
 781         /* Don't race with disconnect */
 782         if (xprt_connected(xprt)) {
 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                 /* wait for more buffer space */
 791                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 792                 sk->sk_write_pending++;
 793                 xprt_wait_for_buffer_space(xprt);
 794         } else
 795                 ret = -ENOTCONN;
 796
 797         spin_unlock(&xprt->transport_lock);
 798         return ret;
 799 }
 800
 801 static int xs_sock_nospace(struct rpc_rqst *req)
 802 {
 803         struct sock_xprt *transport =
 804                 container_of(req->rq_xprt, struct sock_xprt, xprt);
 805         struct sock *sk = transport->inet;
 806         int ret = -EAGAIN;
 807
 808         lock_sock(sk);
 809         if (!sock_writeable(sk))
 810                 ret = xs_nospace(req, transport);
 811         release_sock(sk);
 812         return ret;
 813 }
 814
 815 static int xs_stream_nospace(struct rpc_rqst *req)
 816 {
 817         struct sock_xprt *transport =
 818                 container_of(req->rq_xprt, struct sock_xprt, xprt);
 819         struct sock *sk = transport->inet;
 820         int ret = -EAGAIN;
 821
 822         lock_sock(sk);
 823         if (!sk_stream_memory_free(sk))
 824                 ret = xs_nospace(req, transport);
 825         release_sock(sk);
 826         return ret;
 827 }
 828
 829 static void
 830 xs_stream_prepare_request(struct rpc_rqst *req)
 831 {
 832         xdr_free_bvec(&req->rq_rcv_buf);
 833         req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL);
 834 }
 835
 836 /*
 837  * Determine if the previous message in the stream was aborted before it
 838  * could complete transmission.
 839  */
 840 static bool
 841 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
 842 {
 843         return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
 844 }
 845
 846 /*
 847  * Return the stream record marker field for a record of length < 2^31-1
 848  */
 849 static rpc_fraghdr
 850 xs_stream_record_marker(struct xdr_buf *xdr)
 851 {
 852         if (!xdr->len)
 853                 return 0;
 854         return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
 855 }
 856
 857 /**
 858  * xs_local_send_request - write an RPC request to an AF_LOCAL socket
 859  * @req: pointer to RPC request
 860  *
 861  * Return values:
 862  *        0:    The request has been sent
 863  *   EAGAIN:    The socket was blocked, please call again later to
 864  *              complete the request
 865  * ENOTCONN:    Caller needs to invoke connect logic then call again
 866  *    other:    Some other error occurred, the request was not sent
 867  */
 868 static int xs_local_send_request(struct rpc_rqst *req)
 869 {
 870         struct rpc_xprt *xprt = req->rq_xprt;
 871         struct sock_xprt *transport =
 872                                 container_of(xprt, struct sock_xprt, xprt);
 873         struct xdr_buf *xdr = &req->rq_snd_buf;
 874         rpc_fraghdr rm = xs_stream_record_marker(xdr);
 875         unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
 876         struct msghdr msg = {
 877                 .msg_flags      = XS_SENDMSG_FLAGS,
 878         };
 879         unsigned int sent;
 880         int status;
 881
 882         /* Close the stream if the previous transmission was incomplete */
 883         if (xs_send_request_was_aborted(transport, req)) {
 884                 xs_close(xprt);
 885                 return -ENOTCONN;
 886         }
 887
 888         xs_pktdump("packet data:",
 889                         req->rq_svec->iov_base, req->rq_svec->iov_len);
 890
 891         req->rq_xtime = ktime_get();
 892         status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
 893                                    transport->xmit.offset, rm, &sent);
 894         dprintk("RPC:       %s(%u) = %d\n",
 895                         __func__, xdr->len - transport->xmit.offset, status);
 896
 897         if (status == -EAGAIN && sock_writeable(transport->inet))
 898                 status = -ENOBUFS;
 899
 900         if (likely(sent > 0) || status == 0) {
 901                 transport->xmit.offset += sent;
 902                 req->rq_bytes_sent = transport->xmit.offset;
 903                 if (likely(req->rq_bytes_sent >= msglen)) {
 904                         req->rq_xmit_bytes_sent += transport->xmit.offset;
 905                         transport->xmit.offset = 0;
 906                         return 0;
 907                 }
 908                 status = -EAGAIN;
 909         }
 910
 911         switch (status) {
 912         case -ENOBUFS:
 913                 break;
 914         case -EAGAIN:
 915                 status = xs_stream_nospace(req);
 916                 break;
 917         default:
 918                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 919                         -status);
 920                 fallthrough;
 921         case -EPIPE:
 922                 xs_close(xprt);
 923                 status = -ENOTCONN;
 924         }
 925
 926         return status;
 927 }
 928
 929 /**
 930  * xs_udp_send_request - write an RPC request to a UDP socket
 931  * @req: pointer to RPC request
 932  *
 933  * Return values:
 934  *        0:    The request has been sent
 935  *   EAGAIN:    The socket was blocked, please call again later to
 936  *              complete the request
 937  * ENOTCONN:    Caller needs to invoke connect logic then call again
 938  *    other:    Some other error occurred, the request was not sent
 939  */
 940 static int xs_udp_send_request(struct rpc_rqst *req)
 941 {
 942         struct rpc_xprt *xprt = req->rq_xprt;
 943         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 944         struct xdr_buf *xdr = &req->rq_snd_buf;
 945         struct msghdr msg = {
 946                 .msg_name       = xs_addr(xprt),
 947                 .msg_namelen    = xprt->addrlen,
 948                 .msg_flags      = XS_SENDMSG_FLAGS,
 949         };
 950         unsigned int sent;
 951         int status;
 952
 953         xs_pktdump("packet data:",
 954                                 req->rq_svec->iov_base,
 955                                 req->rq_svec->iov_len);
 956
 957         if (!xprt_bound(xprt))
 958                 return -ENOTCONN;
 959
 960         if (!xprt_request_get_cong(xprt, req))
 961                 return -EBADSLT;
 962
 963         req->rq_xtime = ktime_get();
 964         status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
 965
 966         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 967                         xdr->len, status);
 968
 969         /* firewall is blocking us, don't return -EAGAIN or we end up looping */
 970         if (status == -EPERM)
 971                 goto process_status;
 972
 973         if (status == -EAGAIN && sock_writeable(transport->inet))
 974                 status = -ENOBUFS;
 975
 976         if (sent > 0 || status == 0) {
 977                 req->rq_xmit_bytes_sent += sent;
 978                 if (sent >= req->rq_slen)
 979                         return 0;
 980                 /* Still some bytes left; set up for a retry later. */
 981                 status = -EAGAIN;
 982         }
 983
 984 process_status:
 985         switch (status) {
 986         case -ENOTSOCK:
 987                 status = -ENOTCONN;
 988                 /* Should we call xs_close() here? */
 989                 break;
 990         case -EAGAIN:
 991                 status = xs_sock_nospace(req);
 992                 break;
 993         case -ENETUNREACH:
 994         case -ENOBUFS:
 995         case -EPIPE:
 996         case -ECONNREFUSED:
 997         case -EPERM:
 998                 /* When the server has died, an ICMP port unreachable message
 999                  * prompts ECONNREFUSED. */
1000                 break;
1001         default:
1002                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
1003                         -status);
1004         }
1005
1006         return status;
1007 }
1008
1009 /**
1010  * xs_tcp_send_request - write an RPC request to a TCP socket
1011  * @req: pointer to RPC request
1012  *
1013  * Return values:
1014  *        0:    The request has been sent
1015  *   EAGAIN:    The socket was blocked, please call again later to
1016  *              complete the request
1017  * ENOTCONN:    Caller needs to invoke connect logic then call again
1018  *    other:    Some other error occurred, the request was not sent
1019  *
1020  * XXX: In the case of soft timeouts, should we eventually give up
1021  *      if sendmsg is not able to make progress?
1022  */
1023 static int xs_tcp_send_request(struct rpc_rqst *req)
1024 {
1025         struct rpc_xprt *xprt = req->rq_xprt;
1026         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1027         struct xdr_buf *xdr = &req->rq_snd_buf;
1028         rpc_fraghdr rm = xs_stream_record_marker(xdr);
1029         unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1030         struct msghdr msg = {
1031                 .msg_flags      = XS_SENDMSG_FLAGS,
1032         };
1033         bool vm_wait = false;
1034         unsigned int sent;
1035         int status;
1036
1037         /* Close the stream if the previous transmission was incomplete */
1038         if (xs_send_request_was_aborted(transport, req)) {
1039                 if (transport->sock != NULL)
1040                         kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1041                 return -ENOTCONN;
1042         }
1043         if (!transport->inet)
1044                 return -ENOTCONN;
1045
1046         xs_pktdump("packet data:",
1047                                 req->rq_svec->iov_base,
1048                                 req->rq_svec->iov_len);
1049
1050         if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1051                 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1052
1053         xs_set_srcport(transport, transport->sock);
1054
1055         /* Continue transmitting the packet/record. We must be careful
1056          * to cope with writespace callbacks arriving _after_ we have
1057          * called sendmsg(). */
1058         req->rq_xtime = ktime_get();
1059         tcp_sock_set_cork(transport->inet, true);
1060         while (1) {
1061                 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1062                                            transport->xmit.offset, rm, &sent);
1063
1064                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
1065                                 xdr->len - transport->xmit.offset, status);
1066
1067                 /* If we've sent the entire packet, immediately
1068                  * reset the count of bytes sent. */
1069                 transport->xmit.offset += sent;
1070                 req->rq_bytes_sent = transport->xmit.offset;
1071                 if (likely(req->rq_bytes_sent >= msglen)) {
1072                         req->rq_xmit_bytes_sent += transport->xmit.offset;
1073                         transport->xmit.offset = 0;
1074                         if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1075                                 tcp_sock_set_cork(transport->inet, false);
1076                         return 0;
1077                 }
1078
1079                 WARN_ON_ONCE(sent == 0 && status == 0);
1080
1081                 if (status == -EAGAIN ) {
1082                         /*
1083                          * Return EAGAIN if we're sure we're hitting the
1084                          * socket send buffer limits.
1085                          */
1086                         if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
1087                                 break;
1088                         /*
1089                          * Did we hit a memory allocation failure?
1090                          */
1091                         if (sent == 0) {
1092                                 status = -ENOBUFS;
1093                                 if (vm_wait)
1094                                         break;
1095                                 /* Retry, knowing now that we're below the
1096                                  * socket send buffer limit
1097                                  */
1098                                 vm_wait = true;
1099                         }
1100                         continue;
1101                 }
1102                 if (status < 0)
1103                         break;
1104                 vm_wait = false;
1105         }
1106
1107         switch (status) {
1108         case -ENOTSOCK:
1109                 status = -ENOTCONN;
1110                 /* Should we call xs_close() here? */
1111                 break;
1112         case -EAGAIN:
1113                 status = xs_stream_nospace(req);
1114                 break;
1115         case -ECONNRESET:
1116         case -ECONNREFUSED:
1117         case -ENOTCONN:
1118         case -EADDRINUSE:
1119         case -ENOBUFS:
1120         case -EPIPE:
1121                 break;
1122         default:
1123                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
1124                         -status);
1125         }
1126
1127         return status;
1128 }
1129
1130 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1131 {
1132         transport->old_data_ready = sk->sk_data_ready;
1133         transport->old_state_change = sk->sk_state_change;
1134         transport->old_write_space = sk->sk_write_space;
1135         transport->old_error_report = sk->sk_error_report;
1136 }
1137
1138 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1139 {
1140         sk->sk_data_ready = transport->old_data_ready;
1141         sk->sk_state_change = transport->old_state_change;
1142         sk->sk_write_space = transport->old_write_space;
1143         sk->sk_error_report = transport->old_error_report;
1144 }
1145
1146 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1147 {
1148         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1149
1150         clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1151         clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1152         clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1153         clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1154 }
1155
1156 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1157 {
1158         set_bit(nr, &transport->sock_state);
1159         queue_work(xprtiod_workqueue, &transport->error_worker);
1160 }
1161
1162 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1163 {
1164         xprt->connect_cookie++;
1165         smp_mb__before_atomic();
1166         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1167         clear_bit(XPRT_CLOSING, &xprt->state);
1168         xs_sock_reset_state_flags(xprt);
1169         smp_mb__after_atomic();
1170 }
1171
1172 /**
1173  * xs_error_report - callback to handle TCP socket state errors
1174  * @sk: socket
1175  *
1176  * Note: we don't call sock_error() since there may be a rpc_task
1177  * using the socket, and so we don't want to clear sk->sk_err.
1178  */
1179 static void xs_error_report(struct sock *sk)
1180 {
1181         struct sock_xprt *transport;
1182         struct rpc_xprt *xprt;
1183
1184         if (!(xprt = xprt_from_sock(sk)))
1185                 return;
1186
1187         transport = container_of(xprt, struct sock_xprt, xprt);
1188         transport->xprt_err = -sk->sk_err;
1189         if (transport->xprt_err == 0)
1190                 return;
1191         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
1192                         xprt, -transport->xprt_err);
1193         trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1194
1195         /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1196         smp_mb__before_atomic();
1197         xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1198 }
1199
1200 static void xs_reset_transport(struct sock_xprt *transport)
1201 {
1202         struct socket *sock = transport->sock;
1203         struct sock *sk = transport->inet;
1204         struct rpc_xprt *xprt = &transport->xprt;
1205         struct file *filp = transport->file;
1206
1207         if (sk == NULL)
1208                 return;
1209
1210         if (atomic_read(&transport->xprt.swapper))
1211                 sk_clear_memalloc(sk);
1212
1213         kernel_sock_shutdown(sock, SHUT_RDWR);
1214
1215         mutex_lock(&transport->recv_mutex);
1216         lock_sock(sk);
1217         transport->inet = NULL;
1218         transport->sock = NULL;
1219         transport->file = NULL;
1220
1221         sk->sk_user_data = NULL;
1222
1223         xs_restore_old_callbacks(transport, sk);
1224         xprt_clear_connected(xprt);
1225         xs_sock_reset_connection_flags(xprt);
1226         /* Reset stream record info */
1227         xs_stream_reset_connect(transport);
1228         release_sock(sk);
1229         mutex_unlock(&transport->recv_mutex);
1230
1231         trace_rpc_socket_close(xprt, sock);
1232         fput(filp);
1233
1234         xprt_disconnect_done(xprt);
1235 }
1236
1237 /**
1238  * xs_close - close a socket
1239  * @xprt: transport
1240  *
1241  * This is used when all requests are complete; ie, no DRC state remains
1242  * on the server we want to save.
1243  *
1244  * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1245  * xs_reset_transport() zeroing the socket from underneath a writer.
1246  */
1247 static void xs_close(struct rpc_xprt *xprt)
1248 {
1249         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1250
1251         dprintk("RPC:       xs_close xprt %p\n", xprt);
1252
1253         xs_reset_transport(transport);
1254         xprt->reestablish_timeout = 0;
1255 }
1256
1257 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1258 {
1259         dprintk("RPC:       injecting transport disconnect on xprt=%p\n",
1260                 xprt);
1261         xprt_disconnect_done(xprt);
1262 }
1263
1264 static void xs_xprt_free(struct rpc_xprt *xprt)
1265 {
1266         xs_free_peer_addresses(xprt);
1267         xprt_free(xprt);
1268 }
1269
1270 /**
1271  * xs_destroy - prepare to shutdown a transport
1272  * @xprt: doomed transport
1273  *
1274  */
1275 static void xs_destroy(struct rpc_xprt *xprt)
1276 {
1277         struct sock_xprt *transport = container_of(xprt,
1278                         struct sock_xprt, xprt);
1279         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
1280
1281         cancel_delayed_work_sync(&transport->connect_worker);
1282         xs_close(xprt);
1283         cancel_work_sync(&transport->recv_worker);
1284         cancel_work_sync(&transport->error_worker);
1285         xs_xprt_free(xprt);
1286         module_put(THIS_MODULE);
1287 }
1288
1289 /**
1290  * xs_udp_data_read_skb - receive callback for UDP sockets
1291  * @xprt: transport
1292  * @sk: socket
1293  * @skb: skbuff
1294  *
1295  */
1296 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1297                 struct sock *sk,
1298                 struct sk_buff *skb)
1299 {
1300         struct rpc_task *task;
1301         struct rpc_rqst *rovr;
1302         int repsize, copied;
1303         u32 _xid;
1304         __be32 *xp;
1305
1306         repsize = skb->len;
1307         if (repsize < 4) {
1308                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
1309                 return;
1310         }
1311
1312         /* Copy the XID from the skb... */
1313         xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1314         if (xp == NULL)
1315                 return;
1316
1317         /* Look up and lock the request corresponding to the given XID */
1318         spin_lock(&xprt->queue_lock);
1319         rovr = xprt_lookup_rqst(xprt, *xp);
1320         if (!rovr)
1321                 goto out_unlock;
1322         xprt_pin_rqst(rovr);
1323         xprt_update_rtt(rovr->rq_task);
1324         spin_unlock(&xprt->queue_lock);
1325         task = rovr->rq_task;
1326
1327         if ((copied = rovr->rq_private_buf.buflen) > repsize)
1328                 copied = repsize;
1329
1330         /* Suck it into the iovec, verify checksum if not done by hw. */
1331         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1332                 spin_lock(&xprt->queue_lock);
1333                 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1334                 goto out_unpin;
1335         }
1336
1337
1338         spin_lock(&xprt->transport_lock);
1339         xprt_adjust_cwnd(xprt, task, copied);
1340         spin_unlock(&xprt->transport_lock);
1341         spin_lock(&xprt->queue_lock);
1342         xprt_complete_rqst(task, copied);
1343         __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1344 out_unpin:
1345         xprt_unpin_rqst(rovr);
1346  out_unlock:
1347         spin_unlock(&xprt->queue_lock);
1348 }
1349
1350 static void xs_udp_data_receive(struct sock_xprt *transport)
1351 {
1352         struct sk_buff *skb;
1353         struct sock *sk;
1354         int err;
1355
1356         mutex_lock(&transport->recv_mutex);
1357         sk = transport->inet;
1358         if (sk == NULL)
1359                 goto out;
1360         for (;;) {
1361                 skb = skb_recv_udp(sk, 0, 1, &err);
1362                 if (skb == NULL)
1363                         break;
1364                 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1365                 consume_skb(skb);
1366                 cond_resched();
1367         }
1368         xs_poll_check_readable(transport);
1369 out:
1370         mutex_unlock(&transport->recv_mutex);
1371 }
1372
1373 static void xs_udp_data_receive_workfn(struct work_struct *work)
1374 {
1375         struct sock_xprt *transport =
1376                 container_of(work, struct sock_xprt, recv_worker);
1377         unsigned int pflags = memalloc_nofs_save();
1378
1379         xs_udp_data_receive(transport);
1380         memalloc_nofs_restore(pflags);
1381 }
1382
1383 /**
1384  * xs_data_ready - "data ready" callback for UDP sockets
1385  * @sk: socket with data to read
1386  *
1387  */
1388 static void xs_data_ready(struct sock *sk)
1389 {
1390         struct rpc_xprt *xprt;
1391
1392         dprintk("RPC:       xs_data_ready...\n");
1393         xprt = xprt_from_sock(sk);
1394         if (xprt != NULL) {
1395                 struct sock_xprt *transport = container_of(xprt,
1396                                 struct sock_xprt, xprt);
1397                 transport->old_data_ready(sk);
1398                 /* Any data means we had a useful conversation, so
1399                  * then we don't need to delay the next reconnect
1400                  */
1401                 if (xprt->reestablish_timeout)
1402                         xprt->reestablish_timeout = 0;
1403                 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1404                         queue_work(xprtiod_workqueue, &transport->recv_worker);
1405         }
1406 }
1407
1408 /*
1409  * Helper function to force a TCP close if the server is sending
1410  * junk and/or it has put us in CLOSE_WAIT
1411  */
1412 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1413 {
1414         xprt_force_disconnect(xprt);
1415 }
1416
1417 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1418 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1419 {
1420         return PAGE_SIZE;
1421 }
1422 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1423
1424 /**
1425  * xs_tcp_state_change - callback to handle TCP socket state changes
1426  * @sk: socket whose state has changed
1427  *
1428  */
1429 static void xs_tcp_state_change(struct sock *sk)
1430 {
1431         struct rpc_xprt *xprt;
1432         struct sock_xprt *transport;
1433
1434         if (!(xprt = xprt_from_sock(sk)))
1435                 return;
1436         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1437         dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1438                         sk->sk_state, xprt_connected(xprt),
1439                         sock_flag(sk, SOCK_DEAD),
1440                         sock_flag(sk, SOCK_ZAPPED),
1441                         sk->sk_shutdown);
1442
1443         transport = container_of(xprt, struct sock_xprt, xprt);
1444         trace_rpc_socket_state_change(xprt, sk->sk_socket);
1445         switch (sk->sk_state) {
1446         case TCP_ESTABLISHED:
1447                 if (!xprt_test_and_set_connected(xprt)) {
1448                         xprt->connect_cookie++;
1449                         clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1450                         xprt_clear_connecting(xprt);
1451
1452                         xprt->stat.connect_count++;
1453                         xprt->stat.connect_time += (long)jiffies -
1454                                                    xprt->stat.connect_start;
1455                         xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1456                 }
1457                 break;
1458         case TCP_FIN_WAIT1:
1459                 /* The client initiated a shutdown of the socket */
1460                 xprt->connect_cookie++;
1461                 xprt->reestablish_timeout = 0;
1462                 set_bit(XPRT_CLOSING, &xprt->state);
1463                 smp_mb__before_atomic();
1464                 clear_bit(XPRT_CONNECTED, &xprt->state);
1465                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1466                 smp_mb__after_atomic();
1467                 break;
1468         case TCP_CLOSE_WAIT:
1469                 /* The server initiated a shutdown of the socket */
1470                 xprt->connect_cookie++;
1471                 clear_bit(XPRT_CONNECTED, &xprt->state);
1472                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1473                 fallthrough;
1474         case TCP_CLOSING:
1475                 /*
1476                  * If the server closed down the connection, make sure that
1477                  * we back off before reconnecting
1478                  */
1479                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1480                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1481                 break;
1482         case TCP_LAST_ACK:
1483                 set_bit(XPRT_CLOSING, &xprt->state);
1484                 smp_mb__before_atomic();
1485                 clear_bit(XPRT_CONNECTED, &xprt->state);
1486                 smp_mb__after_atomic();
1487                 break;
1488         case TCP_CLOSE:
1489                 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1490                                         &transport->sock_state))
1491                         xprt_clear_connecting(xprt);
1492                 clear_bit(XPRT_CLOSING, &xprt->state);
1493                 /* Trigger the socket release */
1494                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1495         }
1496 }
1497
1498 static void xs_write_space(struct sock *sk)
1499 {
1500         struct socket_wq *wq;
1501         struct sock_xprt *transport;
1502         struct rpc_xprt *xprt;
1503
1504         if (!sk->sk_socket)
1505                 return;
1506         clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1507
1508         if (unlikely(!(xprt = xprt_from_sock(sk))))
1509                 return;
1510         transport = container_of(xprt, struct sock_xprt, xprt);
1511         rcu_read_lock();
1512         wq = rcu_dereference(sk->sk_wq);
1513         if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1514                 goto out;
1515
1516         xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1517         sk->sk_write_pending--;
1518 out:
1519         rcu_read_unlock();
1520 }
1521
1522 /**
1523  * xs_udp_write_space - callback invoked when socket buffer space
1524  *                             becomes available
1525  * @sk: socket whose state has changed
1526  *
1527  * Called when more output buffer space is available for this socket.
1528  * We try not to wake our writers until they can make "significant"
1529  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1530  * with a bunch of small requests.
1531  */
1532 static void xs_udp_write_space(struct sock *sk)
1533 {
1534         /* from net/core/sock.c:sock_def_write_space */
1535         if (sock_writeable(sk))
1536                 xs_write_space(sk);
1537 }
1538
1539 /**
1540  * xs_tcp_write_space - callback invoked when socket buffer space
1541  *                             becomes available
1542  * @sk: socket whose state has changed
1543  *
1544  * Called when more output buffer space is available for this socket.
1545  * We try not to wake our writers until they can make "significant"
1546  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1547  * with a bunch of small requests.
1548  */
1549 static void xs_tcp_write_space(struct sock *sk)
1550 {
1551         /* from net/core/stream.c:sk_stream_write_space */
1552         if (sk_stream_is_writeable(sk))
1553                 xs_write_space(sk);
1554 }
1555
1556 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1557 {
1558         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1559         struct sock *sk = transport->inet;
1560
1561         if (transport->rcvsize) {
1562                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1563                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1564         }
1565         if (transport->sndsize) {
1566                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1567                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1568                 sk->sk_write_space(sk);
1569         }
1570 }
1571
1572 /**
1573  * xs_udp_set_buffer_size - set send and receive limits
1574  * @xprt: generic transport
1575  * @sndsize: requested size of send buffer, in bytes
1576  * @rcvsize: requested size of receive buffer, in bytes
1577  *
1578  * Set socket send and receive buffer size limits.
1579  */
1580 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1581 {
1582         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1583
1584         transport->sndsize = 0;
1585         if (sndsize)
1586                 transport->sndsize = sndsize + 1024;
1587         transport->rcvsize = 0;
1588         if (rcvsize)
1589                 transport->rcvsize = rcvsize + 1024;
1590
1591         xs_udp_do_set_buffer_size(xprt);
1592 }
1593
1594 /**
1595  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1596  * @xprt: controlling transport
1597  * @task: task that timed out
1598  *
1599  * Adjust the congestion window after a retransmit timeout has occurred.
1600  */
1601 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1602 {
1603         spin_lock(&xprt->transport_lock);
1604         xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1605         spin_unlock(&xprt->transport_lock);
1606 }
1607
1608 static int xs_get_random_port(void)
1609 {
1610         unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1611         unsigned short range;
1612         unsigned short rand;
1613
1614         if (max < min)
1615                 return -EADDRINUSE;
1616         range = max - min + 1;
1617         rand = (unsigned short) prandom_u32() % range;
1618         return rand + min;
1619 }
1620
1621 static unsigned short xs_sock_getport(struct socket *sock)
1622 {
1623         struct sockaddr_storage buf;
1624         unsigned short port = 0;
1625
1626         if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1627                 goto out;
1628         switch (buf.ss_family) {
1629         case AF_INET6:
1630                 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1631                 break;
1632         case AF_INET:
1633                 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1634         }
1635 out:
1636         return port;
1637 }
1638
1639 /**
1640  * xs_set_port - reset the port number in the remote endpoint address
1641  * @xprt: generic transport
1642  * @port: new port number
1643  *
1644  */
1645 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1646 {
1647         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1648
1649         rpc_set_port(xs_addr(xprt), port);
1650         xs_update_peer_port(xprt);
1651 }
1652
1653 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1654 {
1655         if (transport->srcport == 0 && transport->xprt.reuseport)
1656                 transport->srcport = xs_sock_getport(sock);
1657 }
1658
1659 static int xs_get_srcport(struct sock_xprt *transport)
1660 {
1661         int port = transport->srcport;
1662
1663         if (port == 0 && transport->xprt.resvport)
1664                 port = xs_get_random_port();
1665         return port;
1666 }
1667
1668 unsigned short get_srcport(struct rpc_xprt *xprt)
1669 {
1670         struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1671         unsigned short ret = 0;
1672         mutex_lock(&sock->recv_mutex);
1673         if (sock->sock)
1674                 ret = xs_sock_getport(sock->sock);
1675         mutex_unlock(&sock->recv_mutex);
1676         return ret;
1677 }
1678 EXPORT_SYMBOL(get_srcport);
1679
1680 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1681 {
1682         if (transport->srcport != 0)
1683                 transport->srcport = 0;
1684         if (!transport->xprt.resvport)
1685                 return 0;
1686         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1687                 return xprt_max_resvport;
1688         return --port;
1689 }
1690 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1691 {
1692         struct sockaddr_storage myaddr;
1693         int err, nloop = 0;
1694         int port = xs_get_srcport(transport);
1695         unsigned short last;
1696
1697         /*
1698          * If we are asking for any ephemeral port (i.e. port == 0 &&
1699          * transport->xprt.resvport == 0), don't bind.  Let the local
1700          * port selection happen implicitly when the socket is used
1701          * (for example at connect time).
1702          *
1703          * This ensures that we can continue to establish TCP
1704          * connections even when all local ephemeral ports are already
1705          * a part of some TCP connection.  This makes no difference
1706          * for UDP sockets, but also doesn't harm them.
1707          *
1708          * If we're asking for any reserved port (i.e. port == 0 &&
1709          * transport->xprt.resvport == 1) xs_get_srcport above will
1710          * ensure that port is non-zero and we will bind as needed.
1711          */
1712         if (port <= 0)
1713                 return port;
1714
1715         memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1716         do {
1717                 rpc_set_port((struct sockaddr *)&myaddr, port);
1718                 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1719                                 transport->xprt.addrlen);
1720                 if (err == 0) {
1721                         if (transport->xprt.reuseport)
1722                                 transport->srcport = port;
1723                         break;
1724                 }
1725                 last = port;
1726                 port = xs_next_srcport(transport, port);
1727                 if (port > last)
1728                         nloop++;
1729         } while (err == -EADDRINUSE && nloop != 2);
1730
1731         if (myaddr.ss_family == AF_INET)
1732                 dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
1733                                 &((struct sockaddr_in *)&myaddr)->sin_addr,
1734                                 port, err ? "failed" : "ok", err);
1735         else
1736                 dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
1737                                 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1738                                 port, err ? "failed" : "ok", err);
1739         return err;
1740 }
1741
1742 /*
1743  * We don't support autobind on AF_LOCAL sockets
1744  */
1745 static void xs_local_rpcbind(struct rpc_task *task)
1746 {
1747         xprt_set_bound(task->tk_xprt);
1748 }
1749
1750 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1751 {
1752 }
1753
1754 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1755 static struct lock_class_key xs_key[3];
1756 static struct lock_class_key xs_slock_key[3];
1757
1758 static inline void xs_reclassify_socketu(struct socket *sock)
1759 {
1760         struct sock *sk = sock->sk;
1761
1762         sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1763                 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1764 }
1765
1766 static inline void xs_reclassify_socket4(struct socket *sock)
1767 {
1768         struct sock *sk = sock->sk;
1769
1770         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1771                 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1772 }
1773
1774 static inline void xs_reclassify_socket6(struct socket *sock)
1775 {
1776         struct sock *sk = sock->sk;
1777
1778         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1779                 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1780 }
1781
1782 static inline void xs_reclassify_socket(int family, struct socket *sock)
1783 {
1784         if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1785                 return;
1786
1787         switch (family) {
1788         case AF_LOCAL:
1789                 xs_reclassify_socketu(sock);
1790                 break;
1791         case AF_INET:
1792                 xs_reclassify_socket4(sock);
1793                 break;
1794         case AF_INET6:
1795                 xs_reclassify_socket6(sock);
1796                 break;
1797         }
1798 }
1799 #else
1800 static inline void xs_reclassify_socket(int family, struct socket *sock)
1801 {
1802 }
1803 #endif
1804
1805 static void xs_dummy_setup_socket(struct work_struct *work)
1806 {
1807 }
1808
1809 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1810                 struct sock_xprt *transport, int family, int type,
1811                 int protocol, bool reuseport)
1812 {
1813         struct file *filp;
1814         struct socket *sock;
1815         int err;
1816
1817         err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1818         if (err < 0) {
1819                 dprintk("RPC:       can't create %d transport socket (%d).\n",
1820                                 protocol, -err);
1821                 goto out;
1822         }
1823         xs_reclassify_socket(family, sock);
1824
1825         if (reuseport)
1826                 sock_set_reuseport(sock->sk);
1827
1828         err = xs_bind(transport, sock);
1829         if (err) {
1830                 sock_release(sock);
1831                 goto out;
1832         }
1833
1834         filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1835         if (IS_ERR(filp))
1836                 return ERR_CAST(filp);
1837         transport->file = filp;
1838
1839         return sock;
1840 out:
1841         return ERR_PTR(err);
1842 }
1843
1844 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1845                                       struct socket *sock)
1846 {
1847         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1848                                                                         xprt);
1849
1850         if (!transport->inet) {
1851                 struct sock *sk = sock->sk;
1852
1853                 lock_sock(sk);
1854
1855                 xs_save_old_callbacks(transport, sk);
1856
1857                 sk->sk_user_data = xprt;
1858                 sk->sk_data_ready = xs_data_ready;
1859                 sk->sk_write_space = xs_udp_write_space;
1860                 sock_set_flag(sk, SOCK_FASYNC);
1861                 sk->sk_error_report = xs_error_report;
1862
1863                 xprt_clear_connected(xprt);
1864
1865                 /* Reset to new socket */
1866                 transport->sock = sock;
1867                 transport->inet = sk;
1868
1869                 release_sock(sk);
1870         }
1871
1872         xs_stream_start_connect(transport);
1873
1874         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1875 }
1876
1877 /**
1878  * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1879  * @transport: socket transport to connect
1880  */
1881 static int xs_local_setup_socket(struct sock_xprt *transport)
1882 {
1883         struct rpc_xprt *xprt = &transport->xprt;
1884         struct file *filp;
1885         struct socket *sock;
1886         int status;
1887
1888         status = __sock_create(xprt->xprt_net, AF_LOCAL,
1889                                         SOCK_STREAM, 0, &sock, 1);
1890         if (status < 0) {
1891                 dprintk("RPC:       can't create AF_LOCAL "
1892                         "transport socket (%d).\n", -status);
1893                 goto out;
1894         }
1895         xs_reclassify_socket(AF_LOCAL, sock);
1896
1897         filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1898         if (IS_ERR(filp)) {
1899                 status = PTR_ERR(filp);
1900                 goto out;
1901         }
1902         transport->file = filp;
1903
1904         dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
1905                         xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1906
1907         status = xs_local_finish_connecting(xprt, sock);
1908         trace_rpc_socket_connect(xprt, sock, status);
1909         switch (status) {
1910         case 0:
1911                 dprintk("RPC:       xprt %p connected to %s\n",
1912                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1913                 xprt->stat.connect_count++;
1914                 xprt->stat.connect_time += (long)jiffies -
1915                                            xprt->stat.connect_start;
1916                 xprt_set_connected(xprt);
1917                 break;
1918         case -ENOBUFS:
1919                 break;
1920         case -ENOENT:
1921                 dprintk("RPC:       xprt %p: socket %s does not exist\n",
1922                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1923                 break;
1924         case -ECONNREFUSED:
1925                 dprintk("RPC:       xprt %p: connection refused for %s\n",
1926                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1927                 break;
1928         default:
1929                 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1930                                 __func__, -status,
1931                                 xprt->address_strings[RPC_DISPLAY_ADDR]);
1932         }
1933
1934 out:
1935         xprt_clear_connecting(xprt);
1936         xprt_wake_pending_tasks(xprt, status);
1937         return status;
1938 }
1939
1940 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1941 {
1942         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1943         int ret;
1944
1945         if (RPC_IS_ASYNC(task)) {
1946                 /*
1947                  * We want the AF_LOCAL connect to be resolved in the
1948                  * filesystem namespace of the process making the rpc
1949                  * call.  Thus we connect synchronously.
1950                  *
1951                  * If we want to support asynchronous AF_LOCAL calls,
1952                  * we'll need to figure out how to pass a namespace to
1953                  * connect.
1954                  */
1955                 task->tk_rpc_status = -ENOTCONN;
1956                 rpc_exit(task, -ENOTCONN);
1957                 return;
1958         }
1959         ret = xs_local_setup_socket(transport);
1960         if (ret && !RPC_IS_SOFTCONN(task))
1961                 msleep_interruptible(15000);
1962 }
1963
1964 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1965 /*
1966  * Note that this should be called with XPRT_LOCKED held, or recv_mutex
1967  * held, or when we otherwise know that we have exclusive access to the
1968  * socket, to guard against races with xs_reset_transport.
1969  */
1970 static void xs_set_memalloc(struct rpc_xprt *xprt)
1971 {
1972         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1973                         xprt);
1974
1975         /*
1976          * If there's no sock, then we have nothing to set. The
1977          * reconnecting process will get it for us.
1978          */
1979         if (!transport->inet)
1980                 return;
1981         if (atomic_read(&xprt->swapper))
1982                 sk_set_memalloc(transport->inet);
1983 }
1984
1985 /**
1986  * xs_enable_swap - Tag this transport as being used for swap.
1987  * @xprt: transport to tag
1988  *
1989  * Take a reference to this transport on behalf of the rpc_clnt, and
1990  * optionally mark it for swapping if it wasn't already.
1991  */
1992 static int
1993 xs_enable_swap(struct rpc_xprt *xprt)
1994 {
1995         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
1996
1997         mutex_lock(&xs->recv_mutex);
1998         if (atomic_inc_return(&xprt->swapper) == 1 &&
1999             xs->inet)
2000                 sk_set_memalloc(xs->inet);
2001         mutex_unlock(&xs->recv_mutex);
2002         return 0;
2003 }
2004
2005 /**
2006  * xs_disable_swap - Untag this transport as being used for swap.
2007  * @xprt: transport to tag
2008  *
2009  * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2010  * swapper refcount goes to 0, untag the socket as a memalloc socket.
2011  */
2012 static void
2013 xs_disable_swap(struct rpc_xprt *xprt)
2014 {
2015         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2016
2017         mutex_lock(&xs->recv_mutex);
2018         if (atomic_dec_and_test(&xprt->swapper) &&
2019             xs->inet)
2020                 sk_clear_memalloc(xs->inet);
2021         mutex_unlock(&xs->recv_mutex);
2022 }
2023 #else
2024 static void xs_set_memalloc(struct rpc_xprt *xprt)
2025 {
2026 }
2027
2028 static int
2029 xs_enable_swap(struct rpc_xprt *xprt)
2030 {
2031         return -EINVAL;
2032 }
2033
2034 static void
2035 xs_disable_swap(struct rpc_xprt *xprt)
2036 {
2037 }
2038 #endif
2039
2040 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2041 {
2042         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2043
2044         if (!transport->inet) {
2045                 struct sock *sk = sock->sk;
2046
2047                 lock_sock(sk);
2048
2049                 xs_save_old_callbacks(transport, sk);
2050
2051                 sk->sk_user_data = xprt;
2052                 sk->sk_data_ready = xs_data_ready;
2053                 sk->sk_write_space = xs_udp_write_space;
2054                 sock_set_flag(sk, SOCK_FASYNC);
2055
2056                 xprt_set_connected(xprt);
2057
2058                 /* Reset to new socket */
2059                 transport->sock = sock;
2060                 transport->inet = sk;
2061
2062                 xs_set_memalloc(xprt);
2063
2064                 release_sock(sk);
2065         }
2066         xs_udp_do_set_buffer_size(xprt);
2067
2068         xprt->stat.connect_start = jiffies;
2069 }
2070
2071 static void xs_udp_setup_socket(struct work_struct *work)
2072 {
2073         struct sock_xprt *transport =
2074                 container_of(work, struct sock_xprt, connect_worker.work);
2075         struct rpc_xprt *xprt = &transport->xprt;
2076         struct socket *sock;
2077         int status = -EIO;
2078         unsigned int pflags = current->flags;
2079
2080         if (atomic_read(&xprt->swapper))
2081                 current->flags |= PF_MEMALLOC;
2082         sock = xs_create_sock(xprt, transport,
2083                         xs_addr(xprt)->sa_family, SOCK_DGRAM,
2084                         IPPROTO_UDP, false);
2085         if (IS_ERR(sock))
2086                 goto out;
2087
2088         dprintk("RPC:       worker connecting xprt %p via %s to "
2089                                 "%s (port %s)\n", xprt,
2090                         xprt->address_strings[RPC_DISPLAY_PROTO],
2091                         xprt->address_strings[RPC_DISPLAY_ADDR],
2092                         xprt->address_strings[RPC_DISPLAY_PORT]);
2093
2094         xs_udp_finish_connecting(xprt, sock);
2095         trace_rpc_socket_connect(xprt, sock, 0);
2096         status = 0;
2097 out:
2098         xprt_clear_connecting(xprt);
2099         xprt_unlock_connect(xprt, transport);
2100         xprt_wake_pending_tasks(xprt, status);
2101         current_restore_flags(pflags, PF_MEMALLOC);
2102 }
2103
2104 /**
2105  * xs_tcp_shutdown - gracefully shut down a TCP socket
2106  * @xprt: transport
2107  *
2108  * Initiates a graceful shutdown of the TCP socket by calling the
2109  * equivalent of shutdown(SHUT_RDWR);
2110  */
2111 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2112 {
2113         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2114         struct socket *sock = transport->sock;
2115         int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2116
2117         if (sock == NULL)
2118                 return;
2119         if (!xprt->reuseport) {
2120                 xs_close(xprt);
2121                 return;
2122         }
2123         switch (skst) {
2124         case TCP_FIN_WAIT1:
2125         case TCP_FIN_WAIT2:
2126                 break;
2127         case TCP_ESTABLISHED:
2128         case TCP_CLOSE_WAIT:
2129                 kernel_sock_shutdown(sock, SHUT_RDWR);
2130                 trace_rpc_socket_shutdown(xprt, sock);
2131                 break;
2132         default:
2133                 xs_reset_transport(transport);
2134         }
2135 }
2136
2137 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2138                 struct socket *sock)
2139 {
2140         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2141         unsigned int keepidle;
2142         unsigned int keepcnt;
2143         unsigned int timeo;
2144
2145         spin_lock(&xprt->transport_lock);
2146         keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2147         keepcnt = xprt->timeout->to_retries + 1;
2148         timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2149                 (xprt->timeout->to_retries + 1);
2150         clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2151         spin_unlock(&xprt->transport_lock);
2152
2153         /* TCP Keepalive options */
2154         sock_set_keepalive(sock->sk);
2155         tcp_sock_set_keepidle(sock->sk, keepidle);
2156         tcp_sock_set_keepintvl(sock->sk, keepidle);
2157         tcp_sock_set_keepcnt(sock->sk, keepcnt);
2158
2159         /* TCP user timeout (see RFC5482) */
2160         tcp_sock_set_user_timeout(sock->sk, timeo);
2161 }
2162
2163 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2164                 unsigned long connect_timeout,
2165                 unsigned long reconnect_timeout)
2166 {
2167         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2168         struct rpc_timeout to;
2169         unsigned long initval;
2170
2171         spin_lock(&xprt->transport_lock);
2172         if (reconnect_timeout < xprt->max_reconnect_timeout)
2173                 xprt->max_reconnect_timeout = reconnect_timeout;
2174         if (connect_timeout < xprt->connect_timeout) {
2175                 memcpy(&to, xprt->timeout, sizeof(to));
2176                 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1);
2177                 /* Arbitrary lower limit */
2178                 if (initval <  XS_TCP_INIT_REEST_TO << 1)
2179                         initval = XS_TCP_INIT_REEST_TO << 1;
2180                 to.to_initval = initval;
2181                 to.to_maxval = initval;
2182                 memcpy(&transport->tcp_timeout, &to,
2183                                 sizeof(transport->tcp_timeout));
2184                 xprt->timeout = &transport->tcp_timeout;
2185                 xprt->connect_timeout = connect_timeout;
2186         }
2187         set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2188         spin_unlock(&xprt->transport_lock);
2189 }
2190
2191 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2192 {
2193         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2194
2195         if (!transport->inet) {
2196                 struct sock *sk = sock->sk;
2197
2198                 /* Avoid temporary address, they are bad for long-lived
2199                  * connections such as NFS mounts.
2200                  * RFC4941, section 3.6 suggests that:
2201                  *    Individual applications, which have specific
2202                  *    knowledge about the normal duration of connections,
2203                  *    MAY override this as appropriate.
2204                  */
2205                 if (xs_addr(xprt)->sa_family == PF_INET6) {
2206                         ip6_sock_set_addr_preferences(sk,
2207                                 IPV6_PREFER_SRC_PUBLIC);
2208                 }
2209
2210                 xs_tcp_set_socket_timeouts(xprt, sock);
2211                 tcp_sock_set_nodelay(sk);
2212
2213                 lock_sock(sk);
2214
2215                 xs_save_old_callbacks(transport, sk);
2216
2217                 sk->sk_user_data = xprt;
2218                 sk->sk_data_ready = xs_data_ready;
2219                 sk->sk_state_change = xs_tcp_state_change;
2220                 sk->sk_write_space = xs_tcp_write_space;
2221                 sock_set_flag(sk, SOCK_FASYNC);
2222                 sk->sk_error_report = xs_error_report;
2223
2224                 /* socket options */
2225                 sock_reset_flag(sk, SOCK_LINGER);
2226
2227                 xprt_clear_connected(xprt);
2228
2229                 /* Reset to new socket */
2230                 transport->sock = sock;
2231                 transport->inet = sk;
2232
2233                 release_sock(sk);
2234         }
2235
2236         if (!xprt_bound(xprt))
2237                 return -ENOTCONN;
2238
2239         xs_set_memalloc(xprt);
2240
2241         xs_stream_start_connect(transport);
2242
2243         /* Tell the socket layer to start connecting... */
2244         set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2245         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2246 }
2247
2248 /**
2249  * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2250  * @work: queued work item
2251  *
2252  * Invoked by a work queue tasklet.
2253  */
2254 static void xs_tcp_setup_socket(struct work_struct *work)
2255 {
2256         struct sock_xprt *transport =
2257                 container_of(work, struct sock_xprt, connect_worker.work);
2258         struct socket *sock = transport->sock;
2259         struct rpc_xprt *xprt = &transport->xprt;
2260         int status;
2261         unsigned int pflags = current->flags;
2262
2263         if (atomic_read(&xprt->swapper))
2264                 current->flags |= PF_MEMALLOC;
2265
2266         if (xprt_connected(xprt))
2267                 goto out;
2268         if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2269                                &transport->sock_state) ||
2270             !sock) {
2271                 xs_reset_transport(transport);
2272                 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2273                                       SOCK_STREAM, IPPROTO_TCP, true);
2274                 if (IS_ERR(sock)) {
2275                         xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2276                         goto out;
2277                 }
2278         }
2279
2280         dprintk("RPC:       worker connecting xprt %p via %s to "
2281                                 "%s (port %s)\n", xprt,
2282                         xprt->address_strings[RPC_DISPLAY_PROTO],
2283                         xprt->address_strings[RPC_DISPLAY_ADDR],
2284                         xprt->address_strings[RPC_DISPLAY_PORT]);
2285
2286         status = xs_tcp_finish_connecting(xprt, sock);
2287         trace_rpc_socket_connect(xprt, sock, status);
2288         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
2289                         xprt, -status, xprt_connected(xprt),
2290                         sock->sk->sk_state);
2291         switch (status) {
2292         case 0:
2293         case -EINPROGRESS:
2294                 /* SYN_SENT! */
2295                 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2296                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2297                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2298                 fallthrough;
2299         case -EALREADY:
2300                 goto out_unlock;
2301         case -EADDRNOTAVAIL:
2302                 /* Source port number is unavailable. Try a new one! */
2303                 transport->srcport = 0;
2304                 status = -EAGAIN;
2305                 break;
2306         case -EINVAL:
2307                 /* Happens, for instance, if the user specified a link
2308                  * local IPv6 address without a scope-id.
2309                  */
2310         case -ECONNREFUSED:
2311         case -ECONNRESET:
2312         case -ENETDOWN:
2313         case -ENETUNREACH:
2314         case -EHOSTUNREACH:
2315         case -EADDRINUSE:
2316         case -ENOBUFS:
2317                 break;
2318         default:
2319                 printk("%s: connect returned unhandled error %d\n",
2320                         __func__, status);
2321                 status = -EAGAIN;
2322         }
2323
2324         /* xs_tcp_force_close() wakes tasks with a fixed error code.
2325          * We need to wake them first to ensure the correct error code.
2326          */
2327         xprt_wake_pending_tasks(xprt, status);
2328         xs_tcp_force_close(xprt);
2329 out:
2330         xprt_clear_connecting(xprt);
2331 out_unlock:
2332         xprt_unlock_connect(xprt, transport);
2333         current_restore_flags(pflags, PF_MEMALLOC);
2334 }
2335
2336 /**
2337  * xs_connect - connect a socket to a remote endpoint
2338  * @xprt: pointer to transport structure
2339  * @task: address of RPC task that manages state of connect request
2340  *
2341  * TCP: If the remote end dropped the connection, delay reconnecting.
2342  *
2343  * UDP socket connects are synchronous, but we use a work queue anyway
2344  * to guarantee that even unprivileged user processes can set up a
2345  * socket on a privileged port.
2346  *
2347  * If a UDP socket connect fails, the delay behavior here prevents
2348  * retry floods (hard mounts).
2349  */
2350 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2351 {
2352         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2353         unsigned long delay = 0;
2354
2355         WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2356
2357         if (transport->sock != NULL) {
2358                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
2359                         "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2360
2361                 delay = xprt_reconnect_delay(xprt);
2362                 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2363
2364         } else
2365                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
2366
2367         queue_delayed_work(xprtiod_workqueue,
2368                         &transport->connect_worker,
2369                         delay);
2370 }
2371
2372 static void xs_wake_disconnect(struct sock_xprt *transport)
2373 {
2374         if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2375                 xs_tcp_force_close(&transport->xprt);
2376 }
2377
2378 static void xs_wake_write(struct sock_xprt *transport)
2379 {
2380         if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2381                 xprt_write_space(&transport->xprt);
2382 }
2383
2384 static void xs_wake_error(struct sock_xprt *transport)
2385 {
2386         int sockerr;
2387
2388         if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2389                 return;
2390         mutex_lock(&transport->recv_mutex);
2391         if (transport->sock == NULL)
2392                 goto out;
2393         if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2394                 goto out;
2395         sockerr = xchg(&transport->xprt_err, 0);
2396         if (sockerr < 0)
2397                 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2398 out:
2399         mutex_unlock(&transport->recv_mutex);
2400 }
2401
2402 static void xs_wake_pending(struct sock_xprt *transport)
2403 {
2404         if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2405                 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2406 }
2407
2408 static void xs_error_handle(struct work_struct *work)
2409 {
2410         struct sock_xprt *transport = container_of(work,
2411                         struct sock_xprt, error_worker);
2412
2413         xs_wake_disconnect(transport);
2414         xs_wake_write(transport);
2415         xs_wake_error(transport);
2416         xs_wake_pending(transport);
2417 }
2418
2419 /**
2420  * xs_local_print_stats - display AF_LOCAL socket-specific stats
2421  * @xprt: rpc_xprt struct containing statistics
2422  * @seq: output file
2423  *
2424  */
2425 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2426 {
2427         long idle_time = 0;
2428
2429         if (xprt_connected(xprt))
2430                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2431
2432         seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2433                         "%llu %llu %lu %llu %llu\n",
2434                         xprt->stat.bind_count,
2435                         xprt->stat.connect_count,
2436                         xprt->stat.connect_time / HZ,
2437                         idle_time,
2438                         xprt->stat.sends,
2439                         xprt->stat.recvs,
2440                         xprt->stat.bad_xids,
2441                         xprt->stat.req_u,
2442                         xprt->stat.bklog_u,
2443                         xprt->stat.max_slots,
2444                         xprt->stat.sending_u,
2445                         xprt->stat.pending_u);
2446 }
2447
2448 /**
2449  * xs_udp_print_stats - display UDP socket-specific stats
2450  * @xprt: rpc_xprt struct containing statistics
2451  * @seq: output file
2452  *
2453  */
2454 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2455 {
2456         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2457
2458         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2459                         "%lu %llu %llu\n",
2460                         transport->srcport,
2461                         xprt->stat.bind_count,
2462                         xprt->stat.sends,
2463                         xprt->stat.recvs,
2464                         xprt->stat.bad_xids,
2465                         xprt->stat.req_u,
2466                         xprt->stat.bklog_u,
2467                         xprt->stat.max_slots,
2468                         xprt->stat.sending_u,
2469                         xprt->stat.pending_u);
2470 }
2471
2472 /**
2473  * xs_tcp_print_stats - display TCP socket-specific stats
2474  * @xprt: rpc_xprt struct containing statistics
2475  * @seq: output file
2476  *
2477  */
2478 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2479 {
2480         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2481         long idle_time = 0;
2482
2483         if (xprt_connected(xprt))
2484                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2485
2486         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2487                         "%llu %llu %lu %llu %llu\n",
2488                         transport->srcport,
2489                         xprt->stat.bind_count,
2490                         xprt->stat.connect_count,
2491                         xprt->stat.connect_time / HZ,
2492                         idle_time,
2493                         xprt->stat.sends,
2494                         xprt->stat.recvs,
2495                         xprt->stat.bad_xids,
2496                         xprt->stat.req_u,
2497                         xprt->stat.bklog_u,
2498                         xprt->stat.max_slots,
2499                         xprt->stat.sending_u,
2500                         xprt->stat.pending_u);
2501 }
2502
2503 /*
2504  * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2505  * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2506  * to use the server side send routines.
2507  */
2508 static int bc_malloc(struct rpc_task *task)
2509 {
2510         struct rpc_rqst *rqst = task->tk_rqstp;
2511         size_t size = rqst->rq_callsize;
2512         struct page *page;
2513         struct rpc_buffer *buf;
2514
2515         if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2516                 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2517                           size);
2518                 return -EINVAL;
2519         }
2520
2521         page = alloc_page(GFP_KERNEL);
2522         if (!page)
2523                 return -ENOMEM;
2524
2525         buf = page_address(page);
2526         buf->len = PAGE_SIZE;
2527
2528         rqst->rq_buffer = buf->data;
2529         rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2530         return 0;
2531 }
2532
2533 /*
2534  * Free the space allocated in the bc_alloc routine
2535  */
2536 static void bc_free(struct rpc_task *task)
2537 {
2538         void *buffer = task->tk_rqstp->rq_buffer;
2539         struct rpc_buffer *buf;
2540
2541         buf = container_of(buffer, struct rpc_buffer, data);
2542         free_page((unsigned long)buf);
2543 }
2544
2545 static int bc_sendto(struct rpc_rqst *req)
2546 {
2547         struct xdr_buf *xdr = &req->rq_snd_buf;
2548         struct sock_xprt *transport =
2549                         container_of(req->rq_xprt, struct sock_xprt, xprt);
2550         struct msghdr msg = {
2551                 .msg_flags      = 0,
2552         };
2553         rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2554                                          (u32)xdr->len);
2555         unsigned int sent = 0;
2556         int err;
2557
2558         req->rq_xtime = ktime_get();
2559         err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2560         xdr_free_bvec(xdr);
2561         if (err < 0 || sent != (xdr->len + sizeof(marker)))
2562                 return -EAGAIN;
2563         return sent;
2564 }
2565
2566 /**
2567  * bc_send_request - Send a backchannel Call on a TCP socket
2568  * @req: rpc_rqst containing Call message to be sent
2569  *
2570  * xpt_mutex ensures @rqstp's whole message is written to the socket
2571  * without interruption.
2572  *
2573  * Return values:
2574  *   %0 if the message was sent successfully
2575  *   %ENOTCONN if the message was not sent
2576  */
2577 static int bc_send_request(struct rpc_rqst *req)
2578 {
2579         struct svc_xprt *xprt;
2580         int len;
2581
2582         /*
2583          * Get the server socket associated with this callback xprt
2584          */
2585         xprt = req->rq_xprt->bc_xprt;
2586
2587         /*
2588          * Grab the mutex to serialize data as the connection is shared
2589          * with the fore channel
2590          */
2591         mutex_lock(&xprt->xpt_mutex);
2592         if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2593                 len = -ENOTCONN;
2594         else
2595                 len = bc_sendto(req);
2596         mutex_unlock(&xprt->xpt_mutex);
2597
2598         if (len > 0)
2599                 len = 0;
2600
2601         return len;
2602 }
2603
2604 /*
2605  * The close routine. Since this is client initiated, we do nothing
2606  */
2607
2608 static void bc_close(struct rpc_xprt *xprt)
2609 {
2610         xprt_disconnect_done(xprt);
2611 }
2612
2613 /*
2614  * The xprt destroy routine. Again, because this connection is client
2615  * initiated, we do nothing
2616  */
2617
2618 static void bc_destroy(struct rpc_xprt *xprt)
2619 {
2620         dprintk("RPC:       bc_destroy xprt %p\n", xprt);
2621
2622         xs_xprt_free(xprt);
2623         module_put(THIS_MODULE);
2624 }
2625
2626 static const struct rpc_xprt_ops xs_local_ops = {
2627         .reserve_xprt           = xprt_reserve_xprt,
2628         .release_xprt           = xprt_release_xprt,
2629         .alloc_slot             = xprt_alloc_slot,
2630         .free_slot              = xprt_free_slot,
2631         .rpcbind                = xs_local_rpcbind,
2632         .set_port               = xs_local_set_port,
2633         .connect                = xs_local_connect,
2634         .buf_alloc              = rpc_malloc,
2635         .buf_free               = rpc_free,
2636         .prepare_request        = xs_stream_prepare_request,
2637         .send_request           = xs_local_send_request,
2638         .wait_for_reply_request = xprt_wait_for_reply_request_def,
2639         .close                  = xs_close,
2640         .destroy                = xs_destroy,
2641         .print_stats            = xs_local_print_stats,
2642         .enable_swap            = xs_enable_swap,
2643         .disable_swap           = xs_disable_swap,
2644 };
2645
2646 static const struct rpc_xprt_ops xs_udp_ops = {
2647         .set_buffer_size        = xs_udp_set_buffer_size,
2648         .reserve_xprt           = xprt_reserve_xprt_cong,
2649         .release_xprt           = xprt_release_xprt_cong,
2650         .alloc_slot             = xprt_alloc_slot,
2651         .free_slot              = xprt_free_slot,
2652         .rpcbind                = rpcb_getport_async,
2653         .set_port               = xs_set_port,
2654         .connect                = xs_connect,
2655         .buf_alloc              = rpc_malloc,
2656         .buf_free               = rpc_free,
2657         .send_request           = xs_udp_send_request,
2658         .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
2659         .timer                  = xs_udp_timer,
2660         .release_request        = xprt_release_rqst_cong,
2661         .close                  = xs_close,
2662         .destroy                = xs_destroy,
2663         .print_stats            = xs_udp_print_stats,
2664         .enable_swap            = xs_enable_swap,
2665         .disable_swap           = xs_disable_swap,
2666         .inject_disconnect      = xs_inject_disconnect,
2667 };
2668
2669 static const struct rpc_xprt_ops xs_tcp_ops = {
2670         .reserve_xprt           = xprt_reserve_xprt,
2671         .release_xprt           = xprt_release_xprt,
2672         .alloc_slot             = xprt_alloc_slot,
2673         .free_slot              = xprt_free_slot,
2674         .rpcbind                = rpcb_getport_async,
2675         .set_port               = xs_set_port,
2676         .connect                = xs_connect,
2677         .buf_alloc              = rpc_malloc,
2678         .buf_free               = rpc_free,
2679         .prepare_request        = xs_stream_prepare_request,
2680         .send_request           = xs_tcp_send_request,
2681         .wait_for_reply_request = xprt_wait_for_reply_request_def,
2682         .close                  = xs_tcp_shutdown,
2683         .destroy                = xs_destroy,
2684         .set_connect_timeout    = xs_tcp_set_connect_timeout,
2685         .print_stats            = xs_tcp_print_stats,
2686         .enable_swap            = xs_enable_swap,
2687         .disable_swap           = xs_disable_swap,
2688         .inject_disconnect      = xs_inject_disconnect,
2689 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2690         .bc_setup               = xprt_setup_bc,
2691         .bc_maxpayload          = xs_tcp_bc_maxpayload,
2692         .bc_num_slots           = xprt_bc_max_slots,
2693         .bc_free_rqst           = xprt_free_bc_rqst,
2694         .bc_destroy             = xprt_destroy_bc,
2695 #endif
2696 };
2697
2698 /*
2699  * The rpc_xprt_ops for the server backchannel
2700  */
2701
2702 static const struct rpc_xprt_ops bc_tcp_ops = {
2703         .reserve_xprt           = xprt_reserve_xprt,
2704         .release_xprt           = xprt_release_xprt,
2705         .alloc_slot             = xprt_alloc_slot,
2706         .free_slot              = xprt_free_slot,
2707         .buf_alloc              = bc_malloc,
2708         .buf_free               = bc_free,
2709         .send_request           = bc_send_request,
2710         .wait_for_reply_request = xprt_wait_for_reply_request_def,
2711         .close                  = bc_close,
2712         .destroy                = bc_destroy,
2713         .print_stats            = xs_tcp_print_stats,
2714         .enable_swap            = xs_enable_swap,
2715         .disable_swap           = xs_disable_swap,
2716         .inject_disconnect      = xs_inject_disconnect,
2717 };
2718
2719 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2720 {
2721         static const struct sockaddr_in sin = {
2722                 .sin_family             = AF_INET,
2723                 .sin_addr.s_addr        = htonl(INADDR_ANY),
2724         };
2725         static const struct sockaddr_in6 sin6 = {
2726                 .sin6_family            = AF_INET6,
2727                 .sin6_addr              = IN6ADDR_ANY_INIT,
2728         };
2729
2730         switch (family) {
2731         case AF_LOCAL:
2732                 break;
2733         case AF_INET:
2734                 memcpy(sap, &sin, sizeof(sin));
2735                 break;
2736         case AF_INET6:
2737                 memcpy(sap, &sin6, sizeof(sin6));
2738                 break;
2739         default:
2740                 dprintk("RPC:       %s: Bad address family\n", __func__);
2741                 return -EAFNOSUPPORT;
2742         }
2743         return 0;
2744 }
2745
2746 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2747                                       unsigned int slot_table_size,
2748                                       unsigned int max_slot_table_size)
2749 {
2750         struct rpc_xprt *xprt;
2751         struct sock_xprt *new;
2752
2753         if (args->addrlen > sizeof(xprt->addr)) {
2754                 dprintk("RPC:       xs_setup_xprt: address too large\n");
2755                 return ERR_PTR(-EBADF);
2756         }
2757
2758         xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2759                         max_slot_table_size);
2760         if (xprt == NULL) {
2761                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
2762                                 "rpc_xprt\n");
2763                 return ERR_PTR(-ENOMEM);
2764         }
2765
2766         new = container_of(xprt, struct sock_xprt, xprt);
2767         mutex_init(&new->recv_mutex);
2768         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2769         xprt->addrlen = args->addrlen;
2770         if (args->srcaddr)
2771                 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2772         else {
2773                 int err;
2774                 err = xs_init_anyaddr(args->dstaddr->sa_family,
2775                                         (struct sockaddr *)&new->srcaddr);
2776                 if (err != 0) {
2777                         xprt_free(xprt);
2778                         return ERR_PTR(err);
2779                 }
2780         }
2781
2782         return xprt;
2783 }
2784
2785 static const struct rpc_timeout xs_local_default_timeout = {
2786         .to_initval = 10 * HZ,
2787         .to_maxval = 10 * HZ,
2788         .to_retries = 2,
2789 };
2790
2791 /**
2792  * xs_setup_local - Set up transport to use an AF_LOCAL socket
2793  * @args: rpc transport creation arguments
2794  *
2795  * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2796  */
2797 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2798 {
2799         struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2800         struct sock_xprt *transport;
2801         struct rpc_xprt *xprt;
2802         struct rpc_xprt *ret;
2803
2804         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2805                         xprt_max_tcp_slot_table_entries);
2806         if (IS_ERR(xprt))
2807                 return xprt;
2808         transport = container_of(xprt, struct sock_xprt, xprt);
2809
2810         xprt->prot = 0;
2811         xprt->xprt_class = &xs_local_transport;
2812         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2813
2814         xprt->bind_timeout = XS_BIND_TO;
2815         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2816         xprt->idle_timeout = XS_IDLE_DISC_TO;
2817
2818         xprt->ops = &xs_local_ops;
2819         xprt->timeout = &xs_local_default_timeout;
2820
2821         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2822         INIT_WORK(&transport->error_worker, xs_error_handle);
2823         INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
2824
2825         switch (sun->sun_family) {
2826         case AF_LOCAL:
2827                 if (sun->sun_path[0] != '/') {
2828                         dprintk("RPC:       bad AF_LOCAL address: %s\n",
2829                                         sun->sun_path);
2830                         ret = ERR_PTR(-EINVAL);
2831                         goto out_err;
2832                 }
2833                 xprt_set_bound(xprt);
2834                 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2835                 ret = ERR_PTR(xs_local_setup_socket(transport));
2836                 if (ret)
2837                         goto out_err;
2838                 break;
2839         default:
2840                 ret = ERR_PTR(-EAFNOSUPPORT);
2841                 goto out_err;
2842         }
2843
2844         dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
2845                         xprt->address_strings[RPC_DISPLAY_ADDR]);
2846
2847         if (try_module_get(THIS_MODULE))
2848                 return xprt;
2849         ret = ERR_PTR(-EINVAL);
2850 out_err:
2851         xs_xprt_free(xprt);
2852         return ret;
2853 }
2854
2855 static const struct rpc_timeout xs_udp_default_timeout = {
2856         .to_initval = 5 * HZ,
2857         .to_maxval = 30 * HZ,
2858         .to_increment = 5 * HZ,
2859         .to_retries = 5,
2860 };
2861
2862 /**
2863  * xs_setup_udp - Set up transport to use a UDP socket
2864  * @args: rpc transport creation arguments
2865  *
2866  */
2867 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2868 {
2869         struct sockaddr *addr = args->dstaddr;
2870         struct rpc_xprt *xprt;
2871         struct sock_xprt *transport;
2872         struct rpc_xprt *ret;
2873
2874         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2875                         xprt_udp_slot_table_entries);
2876         if (IS_ERR(xprt))
2877                 return xprt;
2878         transport = container_of(xprt, struct sock_xprt, xprt);
2879
2880         xprt->prot = IPPROTO_UDP;
2881         xprt->xprt_class = &xs_udp_transport;
2882         /* XXX: header size can vary due to auth type, IPv6, etc. */
2883         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2884
2885         xprt->bind_timeout = XS_BIND_TO;
2886         xprt->reestablish_timeout = XS_UDP_REEST_TO;
2887         xprt->idle_timeout = XS_IDLE_DISC_TO;
2888
2889         xprt->ops = &xs_udp_ops;
2890
2891         xprt->timeout = &xs_udp_default_timeout;
2892
2893         INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2894         INIT_WORK(&transport->error_worker, xs_error_handle);
2895         INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2896
2897         switch (addr->sa_family) {
2898         case AF_INET:
2899                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2900                         xprt_set_bound(xprt);
2901
2902                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2903                 break;
2904         case AF_INET6:
2905                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2906                         xprt_set_bound(xprt);
2907
2908                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2909                 break;
2910         default:
2911                 ret = ERR_PTR(-EAFNOSUPPORT);
2912                 goto out_err;
2913         }
2914
2915         if (xprt_bound(xprt))
2916                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2917                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2918                                 xprt->address_strings[RPC_DISPLAY_PORT],
2919                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2920         else
2921                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2922                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2923                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2924
2925         if (try_module_get(THIS_MODULE))
2926                 return xprt;
2927         ret = ERR_PTR(-EINVAL);
2928 out_err:
2929         xs_xprt_free(xprt);
2930         return ret;
2931 }
2932
2933 static const struct rpc_timeout xs_tcp_default_timeout = {
2934         .to_initval = 60 * HZ,
2935         .to_maxval = 60 * HZ,
2936         .to_retries = 2,
2937 };
2938
2939 /**
2940  * xs_setup_tcp - Set up transport to use a TCP socket
2941  * @args: rpc transport creation arguments
2942  *
2943  */
2944 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2945 {
2946         struct sockaddr *addr = args->dstaddr;
2947         struct rpc_xprt *xprt;
2948         struct sock_xprt *transport;
2949         struct rpc_xprt *ret;
2950         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2951
2952         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2953                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2954
2955         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2956                         max_slot_table_size);
2957         if (IS_ERR(xprt))
2958                 return xprt;
2959         transport = container_of(xprt, struct sock_xprt, xprt);
2960
2961         xprt->prot = IPPROTO_TCP;
2962         xprt->xprt_class = &xs_tcp_transport;
2963         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2964
2965         xprt->bind_timeout = XS_BIND_TO;
2966         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2967         xprt->idle_timeout = XS_IDLE_DISC_TO;
2968
2969         xprt->ops = &xs_tcp_ops;
2970         xprt->timeout = &xs_tcp_default_timeout;
2971
2972         xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
2973         xprt->connect_timeout = xprt->timeout->to_initval *
2974                 (xprt->timeout->to_retries + 1);
2975
2976         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
2977         INIT_WORK(&transport->error_worker, xs_error_handle);
2978         INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2979
2980         switch (addr->sa_family) {
2981         case AF_INET:
2982                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2983                         xprt_set_bound(xprt);
2984
2985                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2986                 break;
2987         case AF_INET6:
2988                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2989                         xprt_set_bound(xprt);
2990
2991                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2992                 break;
2993         default:
2994                 ret = ERR_PTR(-EAFNOSUPPORT);
2995                 goto out_err;
2996         }
2997
2998         if (xprt_bound(xprt))
2999                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3000                                 xprt->address_strings[RPC_DISPLAY_ADDR],
3001                                 xprt->address_strings[RPC_DISPLAY_PORT],
3002                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
3003         else
3004                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
3005                                 xprt->address_strings[RPC_DISPLAY_ADDR],
3006                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
3007
3008         if (try_module_get(THIS_MODULE))
3009                 return xprt;
3010         ret = ERR_PTR(-EINVAL);
3011 out_err:
3012         xs_xprt_free(xprt);
3013         return ret;
3014 }
3015
3016 /**
3017  * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3018  * @args: rpc transport creation arguments
3019  *
3020  */
3021 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3022 {
3023         struct sockaddr *addr = args->dstaddr;
3024         struct rpc_xprt *xprt;
3025         struct sock_xprt *transport;
3026         struct svc_sock *bc_sock;
3027         struct rpc_xprt *ret;
3028
3029         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3030                         xprt_tcp_slot_table_entries);
3031         if (IS_ERR(xprt))
3032                 return xprt;
3033         transport = container_of(xprt, struct sock_xprt, xprt);
3034
3035         xprt->prot = IPPROTO_TCP;
3036         xprt->xprt_class = &xs_bc_tcp_transport;
3037         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3038         xprt->timeout = &xs_tcp_default_timeout;
3039
3040         /* backchannel */
3041         xprt_set_bound(xprt);
3042         xprt->bind_timeout = 0;
3043         xprt->reestablish_timeout = 0;
3044         xprt->idle_timeout = 0;
3045
3046         xprt->ops = &bc_tcp_ops;
3047
3048         switch (addr->sa_family) {
3049         case AF_INET:
3050                 xs_format_peer_addresses(xprt, "tcp",
3051                                          RPCBIND_NETID_TCP);
3052                 break;
3053         case AF_INET6:
3054                 xs_format_peer_addresses(xprt, "tcp",
3055                                    RPCBIND_NETID_TCP6);
3056                 break;
3057         default:
3058                 ret = ERR_PTR(-EAFNOSUPPORT);
3059                 goto out_err;
3060         }
3061
3062         dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3063                         xprt->address_strings[RPC_DISPLAY_ADDR],
3064                         xprt->address_strings[RPC_DISPLAY_PORT],
3065                         xprt->address_strings[RPC_DISPLAY_PROTO]);
3066
3067         /*
3068          * Once we've associated a backchannel xprt with a connection,
3069          * we want to keep it around as long as the connection lasts,
3070          * in case we need to start using it for a backchannel again;
3071          * this reference won't be dropped until bc_xprt is destroyed.
3072          */
3073         xprt_get(xprt);
3074         args->bc_xprt->xpt_bc_xprt = xprt;
3075         xprt->bc_xprt = args->bc_xprt;
3076         bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3077         transport->sock = bc_sock->sk_sock;
3078         transport->inet = bc_sock->sk_sk;
3079
3080         /*
3081          * Since we don't want connections for the backchannel, we set
3082          * the xprt status to connected
3083          */
3084         xprt_set_connected(xprt);
3085
3086         if (try_module_get(THIS_MODULE))
3087                 return xprt;
3088
3089         args->bc_xprt->xpt_bc_xprt = NULL;
3090         args->bc_xprt->xpt_bc_xps = NULL;
3091         xprt_put(xprt);
3092         ret = ERR_PTR(-EINVAL);
3093 out_err:
3094         xs_xprt_free(xprt);
3095         return ret;
3096 }
3097
3098 static struct xprt_class        xs_local_transport = {
3099         .list           = LIST_HEAD_INIT(xs_local_transport.list),
3100         .name           = "named UNIX socket",
3101         .owner          = THIS_MODULE,
3102         .ident          = XPRT_TRANSPORT_LOCAL,
3103         .setup          = xs_setup_local,
3104         .netid          = { "" },
3105 };
3106
3107 static struct xprt_class        xs_udp_transport = {
3108         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
3109         .name           = "udp",
3110         .owner          = THIS_MODULE,
3111         .ident          = XPRT_TRANSPORT_UDP,
3112         .setup          = xs_setup_udp,
3113         .netid          = { "udp", "udp6", "" },
3114 };
3115
3116 static struct xprt_class        xs_tcp_transport = {
3117         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
3118         .name           = "tcp",
3119         .owner          = THIS_MODULE,
3120         .ident          = XPRT_TRANSPORT_TCP,
3121         .setup          = xs_setup_tcp,
3122         .netid          = { "tcp", "tcp6", "" },
3123 };
3124
3125 static struct xprt_class        xs_bc_tcp_transport = {
3126         .list           = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3127         .name           = "tcp NFSv4.1 backchannel",
3128         .owner          = THIS_MODULE,
3129         .ident          = XPRT_TRANSPORT_BC_TCP,
3130         .setup          = xs_setup_bc_tcp,
3131         .netid          = { "" },
3132 };
3133
3134 /**
3135  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3136  *
3137  */
3138 int init_socket_xprt(void)
3139 {
3140         if (!sunrpc_table_header)
3141                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3142
3143         xprt_register_transport(&xs_local_transport);
3144         xprt_register_transport(&xs_udp_transport);
3145         xprt_register_transport(&xs_tcp_transport);
3146         xprt_register_transport(&xs_bc_tcp_transport);
3147
3148         return 0;
3149 }
3150
3151 /**
3152  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3153  *
3154  */
3155 void cleanup_socket_xprt(void)
3156 {
3157         if (sunrpc_table_header) {
3158                 unregister_sysctl_table(sunrpc_table_header);
3159                 sunrpc_table_header = NULL;
3160         }
3161
3162         xprt_unregister_transport(&xs_local_transport);
3163         xprt_unregister_transport(&xs_udp_transport);
3164         xprt_unregister_transport(&xs_tcp_transport);
3165         xprt_unregister_transport(&xs_bc_tcp_transport);
3166 }
3167
3168 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3169 {
3170         return param_set_uint_minmax(val, kp,
3171                         RPC_MIN_RESVPORT,
3172                         RPC_MAX_RESVPORT);
3173 }
3174
3175 static const struct kernel_param_ops param_ops_portnr = {
3176         .set = param_set_portnr,
3177         .get = param_get_uint,
3178 };
3179
3180 #define param_check_portnr(name, p) \
3181         __param_check(name, p, unsigned int);
3182
3183 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3184 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3185
3186 static int param_set_slot_table_size(const char *val,
3187                                      const struct kernel_param *kp)
3188 {
3189         return param_set_uint_minmax(val, kp,
3190                         RPC_MIN_SLOT_TABLE,
3191                         RPC_MAX_SLOT_TABLE);
3192 }
3193
3194 static const struct kernel_param_ops param_ops_slot_table_size = {
3195         .set = param_set_slot_table_size,
3196         .get = param_get_uint,
3197 };
3198
3199 #define param_check_slot_table_size(name, p) \
3200         __param_check(name, p, unsigned int);
3201
3202 static int param_set_max_slot_table_size(const char *val,
3203                                      const struct kernel_param *kp)
3204 {
3205         return param_set_uint_minmax(val, kp,
3206                         RPC_MIN_SLOT_TABLE,
3207                         RPC_MAX_SLOT_TABLE_LIMIT);
3208 }
3209
3210 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3211         .set = param_set_max_slot_table_size,
3212         .get = param_get_uint,
3213 };
3214
3215 #define param_check_max_slot_table_size(name, p) \
3216         __param_check(name, p, unsigned int);
3217
3218 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3219                    slot_table_size, 0644);
3220 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3221                    max_slot_table_size, 0644);
3222 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3223                    slot_table_size, 0644);