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 <[email protected]>
  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 <[email protected]>
  15  *
  16  * IP socket transport implementation, (C) 2005 Chuck Lever <[email protected]>
  17  *
  18  * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
  19  *   <[email protected]>
  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 <net/tls_prot.h>
  51 #include <net/handshake.h>
  52
  53 #include <linux/bvec.h>
  54 #include <linux/highmem.h>
  55 #include <linux/uio.h>
  56 #include <linux/sched/mm.h>
  57
  58 #include <trace/events/sock.h>
  59 #include <trace/events/sunrpc.h>
  60
  61 #include "socklib.h"
  62 #include "sunrpc.h"
  63
  64 static void xs_close(struct rpc_xprt *xprt);
  65 static void xs_reset_srcport(struct sock_xprt *transport);
  66 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock);
  67 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
  68                 struct socket *sock);
  69
  70 /*
  71  * xprtsock tunables
  72  */
  73 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  74 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
  75 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
  76
  77 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  78 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  79
  80 #define XS_TCP_LINGER_TO        (15U * HZ)
  81 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
  82
  83 /*
  84  * We can register our own files under /proc/sys/sunrpc by
  85  * calling register_sysctl() again.  The files in that
  86  * directory become the union of all files registered there.
  87  *
  88  * We simply need to make sure that we don't collide with
  89  * someone else's file names!
  90  */
  91
  92 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  93 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  94 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
  95 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  96 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  97
  98 static struct ctl_table_header *sunrpc_table_header;
  99
 100 static struct xprt_class xs_local_transport;
 101 static struct xprt_class xs_udp_transport;
 102 static struct xprt_class xs_tcp_transport;
 103 static struct xprt_class xs_tcp_tls_transport;
 104 static struct xprt_class xs_bc_tcp_transport;
 105
 106 /*
 107  * FIXME: changing the UDP slot table size should also resize the UDP
 108  *        socket buffers for existing UDP transports
 109  */
 110 static struct ctl_table xs_tunables_table[] = {
 111         {
 112                 .procname       = "udp_slot_table_entries",
 113                 .data           = &xprt_udp_slot_table_entries,
 114                 .maxlen         = sizeof(unsigned int),
 115                 .mode           = 0644,
 116                 .proc_handler   = proc_dointvec_minmax,
 117                 .extra1         = &min_slot_table_size,
 118                 .extra2         = &max_slot_table_size
 119         },
 120         {
 121                 .procname       = "tcp_slot_table_entries",
 122                 .data           = &xprt_tcp_slot_table_entries,
 123                 .maxlen         = sizeof(unsigned int),
 124                 .mode           = 0644,
 125                 .proc_handler   = proc_dointvec_minmax,
 126                 .extra1         = &min_slot_table_size,
 127                 .extra2         = &max_slot_table_size
 128         },
 129         {
 130                 .procname       = "tcp_max_slot_table_entries",
 131                 .data           = &xprt_max_tcp_slot_table_entries,
 132                 .maxlen         = sizeof(unsigned int),
 133                 .mode           = 0644,
 134                 .proc_handler   = proc_dointvec_minmax,
 135                 .extra1         = &min_slot_table_size,
 136                 .extra2         = &max_tcp_slot_table_limit
 137         },
 138         {
 139                 .procname       = "min_resvport",
 140                 .data           = &xprt_min_resvport,
 141                 .maxlen         = sizeof(unsigned int),
 142                 .mode           = 0644,
 143                 .proc_handler   = proc_dointvec_minmax,
 144                 .extra1         = &xprt_min_resvport_limit,
 145                 .extra2         = &xprt_max_resvport_limit
 146         },
 147         {
 148                 .procname       = "max_resvport",
 149                 .data           = &xprt_max_resvport,
 150                 .maxlen         = sizeof(unsigned int),
 151                 .mode           = 0644,
 152                 .proc_handler   = proc_dointvec_minmax,
 153                 .extra1         = &xprt_min_resvport_limit,
 154                 .extra2         = &xprt_max_resvport_limit
 155         },
 156         {
 157                 .procname       = "tcp_fin_timeout",
 158                 .data           = &xs_tcp_fin_timeout,
 159                 .maxlen         = sizeof(xs_tcp_fin_timeout),
 160                 .mode           = 0644,
 161                 .proc_handler   = proc_dointvec_jiffies,
 162         },
 163 };
 164
 165 /*
 166  * Wait duration for a reply from the RPC portmapper.
 167  */
 168 #define XS_BIND_TO              (60U * HZ)
 169
 170 /*
 171  * Delay if a UDP socket connect error occurs.  This is most likely some
 172  * kind of resource problem on the local host.
 173  */
 174 #define XS_UDP_REEST_TO         (2U * HZ)
 175
 176 /*
 177  * The reestablish timeout allows clients to delay for a bit before attempting
 178  * to reconnect to a server that just dropped our connection.
 179  *
 180  * We implement an exponential backoff when trying to reestablish a TCP
 181  * transport connection with the server.  Some servers like to drop a TCP
 182  * connection when they are overworked, so we start with a short timeout and
 183  * increase over time if the server is down or not responding.
 184  */
 185 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
 186
 187 /*
 188  * TCP idle timeout; client drops the transport socket if it is idle
 189  * for this long.  Note that we also timeout UDP sockets to prevent
 190  * holding port numbers when there is no RPC traffic.
 191  */
 192 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 193
 194 /*
 195  * TLS handshake timeout.
 196  */
 197 #define XS_TLS_HANDSHAKE_TO     (10U * HZ)
 198
 199 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 200 # undef  RPC_DEBUG_DATA
 201 # define RPCDBG_FACILITY        RPCDBG_TRANS
 202 #endif
 203
 204 #ifdef RPC_DEBUG_DATA
 205 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 206 {
 207         u8 *buf = (u8 *) packet;
 208         int j;
 209
 210         dprintk("RPC:       %s\n", msg);
 211         for (j = 0; j < count && j < 128; j += 4) {
 212                 if (!(j & 31)) {
 213                         if (j)
 214                                 dprintk("\n");
 215                         dprintk("0x%04x ", j);
 216                 }
 217                 dprintk("%02x%02x%02x%02x ",
 218                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
 219         }
 220         dprintk("\n");
 221 }
 222 #else
 223 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 224 {
 225         /* NOP */
 226 }
 227 #endif
 228
 229 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 230 {
 231         return (struct rpc_xprt *) sk->sk_user_data;
 232 }
 233
 234 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 235 {
 236         return (struct sockaddr *) &xprt->addr;
 237 }
 238
 239 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
 240 {
 241         return (struct sockaddr_un *) &xprt->addr;
 242 }
 243
 244 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
 245 {
 246         return (struct sockaddr_in *) &xprt->addr;
 247 }
 248
 249 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
 250 {
 251         return (struct sockaddr_in6 *) &xprt->addr;
 252 }
 253
 254 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
 255 {
 256         struct sockaddr *sap = xs_addr(xprt);
 257         struct sockaddr_in6 *sin6;
 258         struct sockaddr_in *sin;
 259         struct sockaddr_un *sun;
 260         char buf[128];
 261
 262         switch (sap->sa_family) {
 263         case AF_LOCAL:
 264                 sun = xs_addr_un(xprt);
 265                 if (sun->sun_path[0]) {
 266                         strscpy(buf, sun->sun_path, sizeof(buf));
 267                 } else {
 268                         buf[0] = '@';
 269                         strscpy(buf+1, sun->sun_path+1, sizeof(buf)-1);
 270                 }
 271                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 272                                                 kstrdup(buf, GFP_KERNEL);
 273                 break;
 274         case AF_INET:
 275                 (void)rpc_ntop(sap, buf, sizeof(buf));
 276                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 277                                                 kstrdup(buf, GFP_KERNEL);
 278                 sin = xs_addr_in(xprt);
 279                 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
 280                 break;
 281         case AF_INET6:
 282                 (void)rpc_ntop(sap, buf, sizeof(buf));
 283                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 284                                                 kstrdup(buf, GFP_KERNEL);
 285                 sin6 = xs_addr_in6(xprt);
 286                 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
 287                 break;
 288         default:
 289                 BUG();
 290         }
 291
 292         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
 293 }
 294
 295 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
 296 {
 297         struct sockaddr *sap = xs_addr(xprt);
 298         char buf[128];
 299
 300         snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
 301         xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
 302
 303         snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
 304         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
 305 }
 306
 307 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
 308                                      const char *protocol,
 309                                      const char *netid)
 310 {
 311         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 312         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 313         xs_format_common_peer_addresses(xprt);
 314         xs_format_common_peer_ports(xprt);
 315 }
 316
 317 static void xs_update_peer_port(struct rpc_xprt *xprt)
 318 {
 319         kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
 320         kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
 321
 322         xs_format_common_peer_ports(xprt);
 323 }
 324
 325 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 326 {
 327         unsigned int i;
 328
 329         for (i = 0; i < RPC_DISPLAY_MAX; i++)
 330                 switch (i) {
 331                 case RPC_DISPLAY_PROTO:
 332                 case RPC_DISPLAY_NETID:
 333                         continue;
 334                 default:
 335                         kfree(xprt->address_strings[i]);
 336                 }
 337 }
 338
 339 static size_t
 340 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp)
 341 {
 342         size_t i,n;
 343
 344         if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES))
 345                 return want;
 346         n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT;
 347         for (i = 0; i < n; i++) {
 348                 if (buf->pages[i])
 349                         continue;
 350                 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp);
 351                 if (!buf->pages[i]) {
 352                         i *= PAGE_SIZE;
 353                         return i > buf->page_base ? i - buf->page_base : 0;
 354                 }
 355         }
 356         return want;
 357 }
 358
 359 static int
 360 xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
 361                      struct cmsghdr *cmsg, int ret)
 362 {
 363         u8 content_type = tls_get_record_type(sock->sk, cmsg);
 364         u8 level, description;
 365
 366         switch (content_type) {
 367         case 0:
 368                 break;
 369         case TLS_RECORD_TYPE_DATA:
 370                 /* TLS sets EOR at the end of each application data
 371                  * record, even though there might be more frames
 372                  * waiting to be decrypted.
 373                  */
 374                 msg->msg_flags &= ~MSG_EOR;
 375                 break;
 376         case TLS_RECORD_TYPE_ALERT:
 377                 tls_alert_recv(sock->sk, msg, &level, &description);
 378                 ret = (level == TLS_ALERT_LEVEL_FATAL) ?
 379                         -EACCES : -EAGAIN;
 380                 break;
 381         default:
 382                 /* discard this record type */
 383                 ret = -EAGAIN;
 384         }
 385         return ret;
 386 }
 387
 388 static int
 389 xs_sock_recv_cmsg(struct socket *sock, struct msghdr *msg, int flags)
 390 {
 391         union {
 392                 struct cmsghdr  cmsg;
 393                 u8              buf[CMSG_SPACE(sizeof(u8))];
 394         } u;
 395         int ret;
 396
 397         msg->msg_control = &u;
 398         msg->msg_controllen = sizeof(u);
 399         ret = sock_recvmsg(sock, msg, flags);
 400         if (msg->msg_controllen != sizeof(u))
 401                 ret = xs_sock_process_cmsg(sock, msg, &u.cmsg, ret);
 402         return ret;
 403 }
 404
 405 static ssize_t
 406 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek)
 407 {
 408         ssize_t ret;
 409         if (seek != 0)
 410                 iov_iter_advance(&msg->msg_iter, seek);
 411         ret = xs_sock_recv_cmsg(sock, msg, flags);
 412         return ret > 0 ? ret + seek : ret;
 413 }
 414
 415 static ssize_t
 416 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags,
 417                 struct kvec *kvec, size_t count, size_t seek)
 418 {
 419         iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count);
 420         return xs_sock_recvmsg(sock, msg, flags, seek);
 421 }
 422
 423 static ssize_t
 424 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags,
 425                 struct bio_vec *bvec, unsigned long nr, size_t count,
 426                 size_t seek)
 427 {
 428         iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count);
 429         return xs_sock_recvmsg(sock, msg, flags, seek);
 430 }
 431
 432 static ssize_t
 433 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags,
 434                 size_t count)
 435 {
 436         iov_iter_discard(&msg->msg_iter, ITER_DEST, count);
 437         return xs_sock_recv_cmsg(sock, msg, flags);
 438 }
 439
 440 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
 441 static void
 442 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
 443 {
 444         struct bvec_iter bi = {
 445                 .bi_size = count,
 446         };
 447         struct bio_vec bv;
 448
 449         bvec_iter_advance(bvec, &bi, seek & PAGE_MASK);
 450         for_each_bvec(bv, bvec, bi, bi)
 451                 flush_dcache_page(bv.bv_page);
 452 }
 453 #else
 454 static inline void
 455 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek)
 456 {
 457 }
 458 #endif
 459
 460 static ssize_t
 461 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags,
 462                 struct xdr_buf *buf, size_t count, size_t seek, size_t *read)
 463 {
 464         size_t want, seek_init = seek, offset = 0;
 465         ssize_t ret;
 466
 467         want = min_t(size_t, count, buf->head[0].iov_len);
 468         if (seek < want) {
 469                 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek);
 470                 if (ret <= 0)
 471                         goto sock_err;
 472                 offset += ret;
 473                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 474                         goto out;
 475                 if (ret != want)
 476                         goto out;
 477                 seek = 0;
 478         } else {
 479                 seek -= want;
 480                 offset += want;
 481         }
 482
 483         want = xs_alloc_sparse_pages(
 484                 buf, min_t(size_t, count - offset, buf->page_len),
 485                 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
 486         if (seek < want) {
 487                 ret = xs_read_bvec(sock, msg, flags, buf->bvec,
 488                                 xdr_buf_pagecount(buf),
 489                                 want + buf->page_base,
 490                                 seek + buf->page_base);
 491                 if (ret <= 0)
 492                         goto sock_err;
 493                 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base);
 494                 ret -= buf->page_base;
 495                 offset += ret;
 496                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 497                         goto out;
 498                 if (ret != want)
 499                         goto out;
 500                 seek = 0;
 501         } else {
 502                 seek -= want;
 503                 offset += want;
 504         }
 505
 506         want = min_t(size_t, count - offset, buf->tail[0].iov_len);
 507         if (seek < want) {
 508                 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek);
 509                 if (ret <= 0)
 510                         goto sock_err;
 511                 offset += ret;
 512                 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 513                         goto out;
 514                 if (ret != want)
 515                         goto out;
 516         } else if (offset < seek_init)
 517                 offset = seek_init;
 518         ret = -EMSGSIZE;
 519 out:
 520         *read = offset - seek_init;
 521         return ret;
 522 sock_err:
 523         offset += seek;
 524         goto out;
 525 }
 526
 527 static void
 528 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf)
 529 {
 530         if (!transport->recv.copied) {
 531                 if (buf->head[0].iov_len >= transport->recv.offset)
 532                         memcpy(buf->head[0].iov_base,
 533                                         &transport->recv.xid,
 534                                         transport->recv.offset);
 535                 transport->recv.copied = transport->recv.offset;
 536         }
 537 }
 538
 539 static bool
 540 xs_read_stream_request_done(struct sock_xprt *transport)
 541 {
 542         return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT);
 543 }
 544
 545 static void
 546 xs_read_stream_check_eor(struct sock_xprt *transport,
 547                 struct msghdr *msg)
 548 {
 549         if (xs_read_stream_request_done(transport))
 550                 msg->msg_flags |= MSG_EOR;
 551 }
 552
 553 static ssize_t
 554 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg,
 555                 int flags, struct rpc_rqst *req)
 556 {
 557         struct xdr_buf *buf = &req->rq_private_buf;
 558         size_t want, read;
 559         ssize_t ret;
 560
 561         xs_read_header(transport, buf);
 562
 563         want = transport->recv.len - transport->recv.offset;
 564         if (want != 0) {
 565                 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf,
 566                                 transport->recv.copied + want,
 567                                 transport->recv.copied,
 568                                 &read);
 569                 transport->recv.offset += read;
 570                 transport->recv.copied += read;
 571         }
 572
 573         if (transport->recv.offset == transport->recv.len)
 574                 xs_read_stream_check_eor(transport, msg);
 575
 576         if (want == 0)
 577                 return 0;
 578
 579         switch (ret) {
 580         default:
 581                 break;
 582         case -EFAULT:
 583         case -EMSGSIZE:
 584                 msg->msg_flags |= MSG_TRUNC;
 585                 return read;
 586         case 0:
 587                 return -ESHUTDOWN;
 588         }
 589         return ret < 0 ? ret : read;
 590 }
 591
 592 static size_t
 593 xs_read_stream_headersize(bool isfrag)
 594 {
 595         if (isfrag)
 596                 return sizeof(__be32);
 597         return 3 * sizeof(__be32);
 598 }
 599
 600 static ssize_t
 601 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg,
 602                 int flags, size_t want, size_t seek)
 603 {
 604         struct kvec kvec = {
 605                 .iov_base = &transport->recv.fraghdr,
 606                 .iov_len = want,
 607         };
 608         return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek);
 609 }
 610
 611 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 612 static ssize_t
 613 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
 614 {
 615         struct rpc_xprt *xprt = &transport->xprt;
 616         struct rpc_rqst *req;
 617         ssize_t ret;
 618
 619         /* Is this transport associated with the backchannel? */
 620         if (!xprt->bc_serv)
 621                 return -ESHUTDOWN;
 622
 623         /* Look up and lock the request corresponding to the given XID */
 624         req = xprt_lookup_bc_request(xprt, transport->recv.xid);
 625         if (!req) {
 626                 printk(KERN_WARNING "Callback slot table overflowed\n");
 627                 return -ESHUTDOWN;
 628         }
 629         if (transport->recv.copied && !req->rq_private_buf.len)
 630                 return -ESHUTDOWN;
 631
 632         ret = xs_read_stream_request(transport, msg, flags, req);
 633         if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 634                 xprt_complete_bc_request(req, transport->recv.copied);
 635         else
 636                 req->rq_private_buf.len = transport->recv.copied;
 637
 638         return ret;
 639 }
 640 #else /* CONFIG_SUNRPC_BACKCHANNEL */
 641 static ssize_t
 642 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags)
 643 {
 644         return -ESHUTDOWN;
 645 }
 646 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 647
 648 static ssize_t
 649 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags)
 650 {
 651         struct rpc_xprt *xprt = &transport->xprt;
 652         struct rpc_rqst *req;
 653         ssize_t ret = 0;
 654
 655         /* Look up and lock the request corresponding to the given XID */
 656         spin_lock(&xprt->queue_lock);
 657         req = xprt_lookup_rqst(xprt, transport->recv.xid);
 658         if (!req || (transport->recv.copied && !req->rq_private_buf.len)) {
 659                 msg->msg_flags |= MSG_TRUNC;
 660                 goto out;
 661         }
 662         xprt_pin_rqst(req);
 663         spin_unlock(&xprt->queue_lock);
 664
 665         ret = xs_read_stream_request(transport, msg, flags, req);
 666
 667         spin_lock(&xprt->queue_lock);
 668         if (msg->msg_flags & (MSG_EOR|MSG_TRUNC))
 669                 xprt_complete_rqst(req->rq_task, transport->recv.copied);
 670         else
 671                 req->rq_private_buf.len = transport->recv.copied;
 672         xprt_unpin_rqst(req);
 673 out:
 674         spin_unlock(&xprt->queue_lock);
 675         return ret;
 676 }
 677
 678 static ssize_t
 679 xs_read_stream(struct sock_xprt *transport, int flags)
 680 {
 681         struct msghdr msg = { 0 };
 682         size_t want, read = 0;
 683         ssize_t ret = 0;
 684
 685         if (transport->recv.len == 0) {
 686                 want = xs_read_stream_headersize(transport->recv.copied != 0);
 687                 ret = xs_read_stream_header(transport, &msg, flags, want,
 688                                 transport->recv.offset);
 689                 if (ret <= 0)
 690                         goto out_err;
 691                 transport->recv.offset = ret;
 692                 if (transport->recv.offset != want)
 693                         return transport->recv.offset;
 694                 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) &
 695                         RPC_FRAGMENT_SIZE_MASK;
 696                 transport->recv.offset -= sizeof(transport->recv.fraghdr);
 697                 read = ret;
 698         }
 699
 700         switch (be32_to_cpu(transport->recv.calldir)) {
 701         default:
 702                 msg.msg_flags |= MSG_TRUNC;
 703                 break;
 704         case RPC_CALL:
 705                 ret = xs_read_stream_call(transport, &msg, flags);
 706                 break;
 707         case RPC_REPLY:
 708                 ret = xs_read_stream_reply(transport, &msg, flags);
 709         }
 710         if (msg.msg_flags & MSG_TRUNC) {
 711                 transport->recv.calldir = cpu_to_be32(-1);
 712                 transport->recv.copied = -1;
 713         }
 714         if (ret < 0)
 715                 goto out_err;
 716         read += ret;
 717         if (transport->recv.offset < transport->recv.len) {
 718                 if (!(msg.msg_flags & MSG_TRUNC))
 719                         return read;
 720                 msg.msg_flags = 0;
 721                 ret = xs_read_discard(transport->sock, &msg, flags,
 722                                 transport->recv.len - transport->recv.offset);
 723                 if (ret <= 0)
 724                         goto out_err;
 725                 transport->recv.offset += ret;
 726                 read += ret;
 727                 if (transport->recv.offset != transport->recv.len)
 728                         return read;
 729         }
 730         if (xs_read_stream_request_done(transport)) {
 731                 trace_xs_stream_read_request(transport);
 732                 transport->recv.copied = 0;
 733         }
 734         transport->recv.offset = 0;
 735         transport->recv.len = 0;
 736         return read;
 737 out_err:
 738         return ret != 0 ? ret : -ESHUTDOWN;
 739 }
 740
 741 static __poll_t xs_poll_socket(struct sock_xprt *transport)
 742 {
 743         return transport->sock->ops->poll(transport->file, transport->sock,
 744                         NULL);
 745 }
 746
 747 static bool xs_poll_socket_readable(struct sock_xprt *transport)
 748 {
 749         __poll_t events = xs_poll_socket(transport);
 750
 751         return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP);
 752 }
 753
 754 static void xs_poll_check_readable(struct sock_xprt *transport)
 755 {
 756
 757         clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
 758         if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
 759                 return;
 760         if (!xs_poll_socket_readable(transport))
 761                 return;
 762         if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
 763                 queue_work(xprtiod_workqueue, &transport->recv_worker);
 764 }
 765
 766 static void xs_stream_data_receive(struct sock_xprt *transport)
 767 {
 768         size_t read = 0;
 769         ssize_t ret = 0;
 770
 771         mutex_lock(&transport->recv_mutex);
 772         if (transport->sock == NULL)
 773                 goto out;
 774         for (;;) {
 775                 ret = xs_read_stream(transport, MSG_DONTWAIT);
 776                 if (ret < 0)
 777                         break;
 778                 read += ret;
 779                 cond_resched();
 780         }
 781         if (ret == -ESHUTDOWN)
 782                 kernel_sock_shutdown(transport->sock, SHUT_RDWR);
 783         else if (ret == -EACCES)
 784                 xprt_wake_pending_tasks(&transport->xprt, -EACCES);
 785         else
 786                 xs_poll_check_readable(transport);
 787 out:
 788         mutex_unlock(&transport->recv_mutex);
 789         trace_xs_stream_read_data(&transport->xprt, ret, read);
 790 }
 791
 792 static void xs_stream_data_receive_workfn(struct work_struct *work)
 793 {
 794         struct sock_xprt *transport =
 795                 container_of(work, struct sock_xprt, recv_worker);
 796         unsigned int pflags = memalloc_nofs_save();
 797
 798         xs_stream_data_receive(transport);
 799         memalloc_nofs_restore(pflags);
 800 }
 801
 802 static void
 803 xs_stream_reset_connect(struct sock_xprt *transport)
 804 {
 805         transport->recv.offset = 0;
 806         transport->recv.len = 0;
 807         transport->recv.copied = 0;
 808         transport->xmit.offset = 0;
 809 }
 810
 811 static void
 812 xs_stream_start_connect(struct sock_xprt *transport)
 813 {
 814         transport->xprt.stat.connect_count++;
 815         transport->xprt.stat.connect_start = jiffies;
 816 }
 817
 818 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 819
 820 /**
 821  * xs_nospace - handle transmit was incomplete
 822  * @req: pointer to RPC request
 823  * @transport: pointer to struct sock_xprt
 824  *
 825  */
 826 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport)
 827 {
 828         struct rpc_xprt *xprt = &transport->xprt;
 829         struct sock *sk = transport->inet;
 830         int ret = -EAGAIN;
 831
 832         trace_rpc_socket_nospace(req, transport);
 833
 834         /* Protect against races with write_space */
 835         spin_lock(&xprt->transport_lock);
 836
 837         /* Don't race with disconnect */
 838         if (xprt_connected(xprt)) {
 839                 /* wait for more buffer space */
 840                 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
 841                 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 842                 sk->sk_write_pending++;
 843                 xprt_wait_for_buffer_space(xprt);
 844         } else
 845                 ret = -ENOTCONN;
 846
 847         spin_unlock(&xprt->transport_lock);
 848         return ret;
 849 }
 850
 851 static int xs_sock_nospace(struct rpc_rqst *req)
 852 {
 853         struct sock_xprt *transport =
 854                 container_of(req->rq_xprt, struct sock_xprt, xprt);
 855         struct sock *sk = transport->inet;
 856         int ret = -EAGAIN;
 857
 858         lock_sock(sk);
 859         if (!sock_writeable(sk))
 860                 ret = xs_nospace(req, transport);
 861         release_sock(sk);
 862         return ret;
 863 }
 864
 865 static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait)
 866 {
 867         struct sock_xprt *transport =
 868                 container_of(req->rq_xprt, struct sock_xprt, xprt);
 869         struct sock *sk = transport->inet;
 870         int ret = -EAGAIN;
 871
 872         if (vm_wait)
 873                 return -ENOBUFS;
 874         lock_sock(sk);
 875         if (!sk_stream_memory_free(sk))
 876                 ret = xs_nospace(req, transport);
 877         release_sock(sk);
 878         return ret;
 879 }
 880
 881 static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf)
 882 {
 883         return xdr_alloc_bvec(buf, rpc_task_gfp_mask());
 884 }
 885
 886 static void xs_stream_abort_send_request(struct rpc_rqst *req)
 887 {
 888         struct rpc_xprt *xprt = req->rq_xprt;
 889         struct sock_xprt *transport =
 890                 container_of(xprt, struct sock_xprt, xprt);
 891
 892         if (transport->xmit.offset != 0 &&
 893             !test_bit(XPRT_CLOSE_WAIT, &xprt->state))
 894                 xprt_force_disconnect(xprt);
 895 }
 896
 897 /*
 898  * Determine if the previous message in the stream was aborted before it
 899  * could complete transmission.
 900  */
 901 static bool
 902 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req)
 903 {
 904         return transport->xmit.offset != 0 && req->rq_bytes_sent == 0;
 905 }
 906
 907 /*
 908  * Return the stream record marker field for a record of length < 2^31-1
 909  */
 910 static rpc_fraghdr
 911 xs_stream_record_marker(struct xdr_buf *xdr)
 912 {
 913         if (!xdr->len)
 914                 return 0;
 915         return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len);
 916 }
 917
 918 /**
 919  * xs_local_send_request - write an RPC request to an AF_LOCAL socket
 920  * @req: pointer to RPC request
 921  *
 922  * Return values:
 923  *        0:    The request has been sent
 924  *   EAGAIN:    The socket was blocked, please call again later to
 925  *              complete the request
 926  * ENOTCONN:    Caller needs to invoke connect logic then call again
 927  *    other:    Some other error occurred, the request was not sent
 928  */
 929 static int xs_local_send_request(struct rpc_rqst *req)
 930 {
 931         struct rpc_xprt *xprt = req->rq_xprt;
 932         struct sock_xprt *transport =
 933                                 container_of(xprt, struct sock_xprt, xprt);
 934         struct xdr_buf *xdr = &req->rq_snd_buf;
 935         rpc_fraghdr rm = xs_stream_record_marker(xdr);
 936         unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
 937         struct msghdr msg = {
 938                 .msg_flags      = XS_SENDMSG_FLAGS,
 939         };
 940         bool vm_wait;
 941         unsigned int sent;
 942         int status;
 943
 944         /* Close the stream if the previous transmission was incomplete */
 945         if (xs_send_request_was_aborted(transport, req)) {
 946                 xprt_force_disconnect(xprt);
 947                 return -ENOTCONN;
 948         }
 949
 950         xs_pktdump("packet data:",
 951                         req->rq_svec->iov_base, req->rq_svec->iov_len);
 952
 953         vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
 954
 955         req->rq_xtime = ktime_get();
 956         status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
 957                                    transport->xmit.offset, rm, &sent);
 958         dprintk("RPC:       %s(%u) = %d\n",
 959                         __func__, xdr->len - transport->xmit.offset, status);
 960
 961         if (likely(sent > 0) || status == 0) {
 962                 transport->xmit.offset += sent;
 963                 req->rq_bytes_sent = transport->xmit.offset;
 964                 if (likely(req->rq_bytes_sent >= msglen)) {
 965                         req->rq_xmit_bytes_sent += transport->xmit.offset;
 966                         transport->xmit.offset = 0;
 967                         return 0;
 968                 }
 969                 status = -EAGAIN;
 970                 vm_wait = false;
 971         }
 972
 973         switch (status) {
 974         case -EAGAIN:
 975                 status = xs_stream_nospace(req, vm_wait);
 976                 break;
 977         default:
 978                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 979                         -status);
 980                 fallthrough;
 981         case -EPIPE:
 982                 xprt_force_disconnect(xprt);
 983                 status = -ENOTCONN;
 984         }
 985
 986         return status;
 987 }
 988
 989 /**
 990  * xs_udp_send_request - write an RPC request to a UDP socket
 991  * @req: pointer to RPC request
 992  *
 993  * Return values:
 994  *        0:    The request has been sent
 995  *   EAGAIN:    The socket was blocked, please call again later to
 996  *              complete the request
 997  * ENOTCONN:    Caller needs to invoke connect logic then call again
 998  *    other:    Some other error occurred, the request was not sent
 999  */
1000 static int xs_udp_send_request(struct rpc_rqst *req)
1001 {
1002         struct rpc_xprt *xprt = req->rq_xprt;
1003         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1004         struct xdr_buf *xdr = &req->rq_snd_buf;
1005         struct msghdr msg = {
1006                 .msg_name       = xs_addr(xprt),
1007                 .msg_namelen    = xprt->addrlen,
1008                 .msg_flags      = XS_SENDMSG_FLAGS,
1009         };
1010         unsigned int sent;
1011         int status;
1012
1013         xs_pktdump("packet data:",
1014                                 req->rq_svec->iov_base,
1015                                 req->rq_svec->iov_len);
1016
1017         if (!xprt_bound(xprt))
1018                 return -ENOTCONN;
1019
1020         if (!xprt_request_get_cong(xprt, req))
1021                 return -EBADSLT;
1022
1023         status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
1024         if (status < 0)
1025                 return status;
1026         req->rq_xtime = ktime_get();
1027         status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent);
1028
1029         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
1030                         xdr->len, status);
1031
1032         /* firewall is blocking us, don't return -EAGAIN or we end up looping */
1033         if (status == -EPERM)
1034                 goto process_status;
1035
1036         if (status == -EAGAIN && sock_writeable(transport->inet))
1037                 status = -ENOBUFS;
1038
1039         if (sent > 0 || status == 0) {
1040                 req->rq_xmit_bytes_sent += sent;
1041                 if (sent >= req->rq_slen)
1042                         return 0;
1043                 /* Still some bytes left; set up for a retry later. */
1044                 status = -EAGAIN;
1045         }
1046
1047 process_status:
1048         switch (status) {
1049         case -ENOTSOCK:
1050                 status = -ENOTCONN;
1051                 /* Should we call xs_close() here? */
1052                 break;
1053         case -EAGAIN:
1054                 status = xs_sock_nospace(req);
1055                 break;
1056         case -ENETUNREACH:
1057         case -ENOBUFS:
1058         case -EPIPE:
1059         case -ECONNREFUSED:
1060         case -EPERM:
1061                 /* When the server has died, an ICMP port unreachable message
1062                  * prompts ECONNREFUSED. */
1063                 break;
1064         default:
1065                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
1066                         -status);
1067         }
1068
1069         return status;
1070 }
1071
1072 /**
1073  * xs_tcp_send_request - write an RPC request to a TCP socket
1074  * @req: pointer to RPC request
1075  *
1076  * Return values:
1077  *        0:    The request has been sent
1078  *   EAGAIN:    The socket was blocked, please call again later to
1079  *              complete the request
1080  * ENOTCONN:    Caller needs to invoke connect logic then call again
1081  *    other:    Some other error occurred, the request was not sent
1082  *
1083  * XXX: In the case of soft timeouts, should we eventually give up
1084  *      if sendmsg is not able to make progress?
1085  */
1086 static int xs_tcp_send_request(struct rpc_rqst *req)
1087 {
1088         struct rpc_xprt *xprt = req->rq_xprt;
1089         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1090         struct xdr_buf *xdr = &req->rq_snd_buf;
1091         rpc_fraghdr rm = xs_stream_record_marker(xdr);
1092         unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen;
1093         struct msghdr msg = {
1094                 .msg_flags      = XS_SENDMSG_FLAGS,
1095         };
1096         bool vm_wait;
1097         unsigned int sent;
1098         int status;
1099
1100         /* Close the stream if the previous transmission was incomplete */
1101         if (xs_send_request_was_aborted(transport, req)) {
1102                 if (transport->sock != NULL)
1103                         kernel_sock_shutdown(transport->sock, SHUT_RDWR);
1104                 return -ENOTCONN;
1105         }
1106         if (!transport->inet)
1107                 return -ENOTCONN;
1108
1109         xs_pktdump("packet data:",
1110                                 req->rq_svec->iov_base,
1111                                 req->rq_svec->iov_len);
1112
1113         if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state))
1114                 xs_tcp_set_socket_timeouts(xprt, transport->sock);
1115
1116         xs_set_srcport(transport, transport->sock);
1117
1118         /* Continue transmitting the packet/record. We must be careful
1119          * to cope with writespace callbacks arriving _after_ we have
1120          * called sendmsg(). */
1121         req->rq_xtime = ktime_get();
1122         tcp_sock_set_cork(transport->inet, true);
1123
1124         vm_wait = sk_stream_is_writeable(transport->inet) ? true : false;
1125
1126         do {
1127                 status = xprt_sock_sendmsg(transport->sock, &msg, xdr,
1128                                            transport->xmit.offset, rm, &sent);
1129
1130                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
1131                                 xdr->len - transport->xmit.offset, status);
1132
1133                 /* If we've sent the entire packet, immediately
1134                  * reset the count of bytes sent. */
1135                 transport->xmit.offset += sent;
1136                 req->rq_bytes_sent = transport->xmit.offset;
1137                 if (likely(req->rq_bytes_sent >= msglen)) {
1138                         req->rq_xmit_bytes_sent += transport->xmit.offset;
1139                         transport->xmit.offset = 0;
1140                         if (atomic_long_read(&xprt->xmit_queuelen) == 1)
1141                                 tcp_sock_set_cork(transport->inet, false);
1142                         return 0;
1143                 }
1144
1145                 WARN_ON_ONCE(sent == 0 && status == 0);
1146
1147                 if (sent > 0)
1148                         vm_wait = false;
1149
1150         } while (status == 0);
1151
1152         switch (status) {
1153         case -ENOTSOCK:
1154                 status = -ENOTCONN;
1155                 /* Should we call xs_close() here? */
1156                 break;
1157         case -EAGAIN:
1158                 status = xs_stream_nospace(req, vm_wait);
1159                 break;
1160         case -ECONNRESET:
1161         case -ECONNREFUSED:
1162         case -ENOTCONN:
1163         case -EADDRINUSE:
1164         case -ENOBUFS:
1165         case -EPIPE:
1166                 break;
1167         default:
1168                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
1169                         -status);
1170         }
1171
1172         return status;
1173 }
1174
1175 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1176 {
1177         transport->old_data_ready = sk->sk_data_ready;
1178         transport->old_state_change = sk->sk_state_change;
1179         transport->old_write_space = sk->sk_write_space;
1180         transport->old_error_report = sk->sk_error_report;
1181 }
1182
1183 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
1184 {
1185         sk->sk_data_ready = transport->old_data_ready;
1186         sk->sk_state_change = transport->old_state_change;
1187         sk->sk_write_space = transport->old_write_space;
1188         sk->sk_error_report = transport->old_error_report;
1189 }
1190
1191 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
1192 {
1193         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1194
1195         transport->xprt_err = 0;
1196         clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1197         clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state);
1198         clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state);
1199         clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state);
1200         clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state);
1201         clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
1202 }
1203
1204 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr)
1205 {
1206         set_bit(nr, &transport->sock_state);
1207         queue_work(xprtiod_workqueue, &transport->error_worker);
1208 }
1209
1210 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1211 {
1212         xprt->connect_cookie++;
1213         smp_mb__before_atomic();
1214         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1215         clear_bit(XPRT_CLOSING, &xprt->state);
1216         xs_sock_reset_state_flags(xprt);
1217         smp_mb__after_atomic();
1218 }
1219
1220 /**
1221  * xs_error_report - callback to handle TCP socket state errors
1222  * @sk: socket
1223  *
1224  * Note: we don't call sock_error() since there may be a rpc_task
1225  * using the socket, and so we don't want to clear sk->sk_err.
1226  */
1227 static void xs_error_report(struct sock *sk)
1228 {
1229         struct sock_xprt *transport;
1230         struct rpc_xprt *xprt;
1231
1232         if (!(xprt = xprt_from_sock(sk)))
1233                 return;
1234
1235         transport = container_of(xprt, struct sock_xprt, xprt);
1236         transport->xprt_err = -sk->sk_err;
1237         if (transport->xprt_err == 0)
1238                 return;
1239         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
1240                         xprt, -transport->xprt_err);
1241         trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err);
1242
1243         /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */
1244         smp_mb__before_atomic();
1245         xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR);
1246 }
1247
1248 static void xs_reset_transport(struct sock_xprt *transport)
1249 {
1250         struct socket *sock = transport->sock;
1251         struct sock *sk = transport->inet;
1252         struct rpc_xprt *xprt = &transport->xprt;
1253         struct file *filp = transport->file;
1254
1255         if (sk == NULL)
1256                 return;
1257         /*
1258          * Make sure we're calling this in a context from which it is safe
1259          * to call __fput_sync(). In practice that means rpciod and the
1260          * system workqueue.
1261          */
1262         if (!(current->flags & PF_WQ_WORKER)) {
1263                 WARN_ON_ONCE(1);
1264                 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1265                 return;
1266         }
1267
1268         if (atomic_read(&transport->xprt.swapper))
1269                 sk_clear_memalloc(sk);
1270
1271         tls_handshake_cancel(sk);
1272
1273         kernel_sock_shutdown(sock, SHUT_RDWR);
1274
1275         mutex_lock(&transport->recv_mutex);
1276         lock_sock(sk);
1277         transport->inet = NULL;
1278         transport->sock = NULL;
1279         transport->file = NULL;
1280
1281         sk->sk_user_data = NULL;
1282         sk->sk_sndtimeo = 0;
1283
1284         xs_restore_old_callbacks(transport, sk);
1285         xprt_clear_connected(xprt);
1286         xs_sock_reset_connection_flags(xprt);
1287         /* Reset stream record info */
1288         xs_stream_reset_connect(transport);
1289         release_sock(sk);
1290         mutex_unlock(&transport->recv_mutex);
1291
1292         trace_rpc_socket_close(xprt, sock);
1293         __fput_sync(filp);
1294
1295         xprt_disconnect_done(xprt);
1296 }
1297
1298 /**
1299  * xs_close - close a socket
1300  * @xprt: transport
1301  *
1302  * This is used when all requests are complete; ie, no DRC state remains
1303  * on the server we want to save.
1304  *
1305  * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
1306  * xs_reset_transport() zeroing the socket from underneath a writer.
1307  */
1308 static void xs_close(struct rpc_xprt *xprt)
1309 {
1310         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1311
1312         dprintk("RPC:       xs_close xprt %p\n", xprt);
1313
1314         if (transport->sock)
1315                 tls_handshake_close(transport->sock);
1316         xs_reset_transport(transport);
1317         xprt->reestablish_timeout = 0;
1318 }
1319
1320 static void xs_inject_disconnect(struct rpc_xprt *xprt)
1321 {
1322         dprintk("RPC:       injecting transport disconnect on xprt=%p\n",
1323                 xprt);
1324         xprt_disconnect_done(xprt);
1325 }
1326
1327 static void xs_xprt_free(struct rpc_xprt *xprt)
1328 {
1329         xs_free_peer_addresses(xprt);
1330         xprt_free(xprt);
1331 }
1332
1333 /**
1334  * xs_destroy - prepare to shutdown a transport
1335  * @xprt: doomed transport
1336  *
1337  */
1338 static void xs_destroy(struct rpc_xprt *xprt)
1339 {
1340         struct sock_xprt *transport = container_of(xprt,
1341                         struct sock_xprt, xprt);
1342         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
1343
1344         cancel_delayed_work_sync(&transport->connect_worker);
1345         xs_close(xprt);
1346         cancel_work_sync(&transport->recv_worker);
1347         cancel_work_sync(&transport->error_worker);
1348         xs_xprt_free(xprt);
1349         module_put(THIS_MODULE);
1350 }
1351
1352 /**
1353  * xs_udp_data_read_skb - receive callback for UDP sockets
1354  * @xprt: transport
1355  * @sk: socket
1356  * @skb: skbuff
1357  *
1358  */
1359 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1360                 struct sock *sk,
1361                 struct sk_buff *skb)
1362 {
1363         struct rpc_task *task;
1364         struct rpc_rqst *rovr;
1365         int repsize, copied;
1366         u32 _xid;
1367         __be32 *xp;
1368
1369         repsize = skb->len;
1370         if (repsize < 4) {
1371                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
1372                 return;
1373         }
1374
1375         /* Copy the XID from the skb... */
1376         xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1377         if (xp == NULL)
1378                 return;
1379
1380         /* Look up and lock the request corresponding to the given XID */
1381         spin_lock(&xprt->queue_lock);
1382         rovr = xprt_lookup_rqst(xprt, *xp);
1383         if (!rovr)
1384                 goto out_unlock;
1385         xprt_pin_rqst(rovr);
1386         xprt_update_rtt(rovr->rq_task);
1387         spin_unlock(&xprt->queue_lock);
1388         task = rovr->rq_task;
1389
1390         if ((copied = rovr->rq_private_buf.buflen) > repsize)
1391                 copied = repsize;
1392
1393         /* Suck it into the iovec, verify checksum if not done by hw. */
1394         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1395                 spin_lock(&xprt->queue_lock);
1396                 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1397                 goto out_unpin;
1398         }
1399
1400
1401         spin_lock(&xprt->transport_lock);
1402         xprt_adjust_cwnd(xprt, task, copied);
1403         spin_unlock(&xprt->transport_lock);
1404         spin_lock(&xprt->queue_lock);
1405         xprt_complete_rqst(task, copied);
1406         __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1407 out_unpin:
1408         xprt_unpin_rqst(rovr);
1409  out_unlock:
1410         spin_unlock(&xprt->queue_lock);
1411 }
1412
1413 static void xs_udp_data_receive(struct sock_xprt *transport)
1414 {
1415         struct sk_buff *skb;
1416         struct sock *sk;
1417         int err;
1418
1419         mutex_lock(&transport->recv_mutex);
1420         sk = transport->inet;
1421         if (sk == NULL)
1422                 goto out;
1423         for (;;) {
1424                 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err);
1425                 if (skb == NULL)
1426                         break;
1427                 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1428                 consume_skb(skb);
1429                 cond_resched();
1430         }
1431         xs_poll_check_readable(transport);
1432 out:
1433         mutex_unlock(&transport->recv_mutex);
1434 }
1435
1436 static void xs_udp_data_receive_workfn(struct work_struct *work)
1437 {
1438         struct sock_xprt *transport =
1439                 container_of(work, struct sock_xprt, recv_worker);
1440         unsigned int pflags = memalloc_nofs_save();
1441
1442         xs_udp_data_receive(transport);
1443         memalloc_nofs_restore(pflags);
1444 }
1445
1446 /**
1447  * xs_data_ready - "data ready" callback for sockets
1448  * @sk: socket with data to read
1449  *
1450  */
1451 static void xs_data_ready(struct sock *sk)
1452 {
1453         struct rpc_xprt *xprt;
1454
1455         trace_sk_data_ready(sk);
1456
1457         xprt = xprt_from_sock(sk);
1458         if (xprt != NULL) {
1459                 struct sock_xprt *transport = container_of(xprt,
1460                                 struct sock_xprt, xprt);
1461
1462                 trace_xs_data_ready(xprt);
1463
1464                 transport->old_data_ready(sk);
1465
1466                 if (test_bit(XPRT_SOCK_IGNORE_RECV, &transport->sock_state))
1467                         return;
1468
1469                 /* Any data means we had a useful conversation, so
1470                  * then we don't need to delay the next reconnect
1471                  */
1472                 if (xprt->reestablish_timeout)
1473                         xprt->reestablish_timeout = 0;
1474                 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1475                         queue_work(xprtiod_workqueue, &transport->recv_worker);
1476         }
1477 }
1478
1479 /*
1480  * Helper function to force a TCP close if the server is sending
1481  * junk and/or it has put us in CLOSE_WAIT
1482  */
1483 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1484 {
1485         xprt_force_disconnect(xprt);
1486 }
1487
1488 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1489 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1490 {
1491         return PAGE_SIZE;
1492 }
1493 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1494
1495 /**
1496  * xs_local_state_change - callback to handle AF_LOCAL socket state changes
1497  * @sk: socket whose state has changed
1498  *
1499  */
1500 static void xs_local_state_change(struct sock *sk)
1501 {
1502         struct rpc_xprt *xprt;
1503         struct sock_xprt *transport;
1504
1505         if (!(xprt = xprt_from_sock(sk)))
1506                 return;
1507         transport = container_of(xprt, struct sock_xprt, xprt);
1508         if (sk->sk_shutdown & SHUTDOWN_MASK) {
1509                 clear_bit(XPRT_CONNECTED, &xprt->state);
1510                 /* Trigger the socket release */
1511                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1512         }
1513 }
1514
1515 /**
1516  * xs_tcp_state_change - callback to handle TCP socket state changes
1517  * @sk: socket whose state has changed
1518  *
1519  */
1520 static void xs_tcp_state_change(struct sock *sk)
1521 {
1522         struct rpc_xprt *xprt;
1523         struct sock_xprt *transport;
1524
1525         if (!(xprt = xprt_from_sock(sk)))
1526                 return;
1527         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1528         dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1529                         sk->sk_state, xprt_connected(xprt),
1530                         sock_flag(sk, SOCK_DEAD),
1531                         sock_flag(sk, SOCK_ZAPPED),
1532                         sk->sk_shutdown);
1533
1534         transport = container_of(xprt, struct sock_xprt, xprt);
1535         trace_rpc_socket_state_change(xprt, sk->sk_socket);
1536         switch (sk->sk_state) {
1537         case TCP_ESTABLISHED:
1538                 if (!xprt_test_and_set_connected(xprt)) {
1539                         xprt->connect_cookie++;
1540                         clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1541                         xprt_clear_connecting(xprt);
1542
1543                         xprt->stat.connect_count++;
1544                         xprt->stat.connect_time += (long)jiffies -
1545                                                    xprt->stat.connect_start;
1546                         xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING);
1547                 }
1548                 break;
1549         case TCP_FIN_WAIT1:
1550                 /* The client initiated a shutdown of the socket */
1551                 xprt->connect_cookie++;
1552                 xprt->reestablish_timeout = 0;
1553                 set_bit(XPRT_CLOSING, &xprt->state);
1554                 smp_mb__before_atomic();
1555                 clear_bit(XPRT_CONNECTED, &xprt->state);
1556                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1557                 smp_mb__after_atomic();
1558                 break;
1559         case TCP_CLOSE_WAIT:
1560                 /* The server initiated a shutdown of the socket */
1561                 xprt->connect_cookie++;
1562                 clear_bit(XPRT_CONNECTED, &xprt->state);
1563                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1564                 fallthrough;
1565         case TCP_CLOSING:
1566                 /*
1567                  * If the server closed down the connection, make sure that
1568                  * we back off before reconnecting
1569                  */
1570                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1571                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1572                 break;
1573         case TCP_LAST_ACK:
1574                 set_bit(XPRT_CLOSING, &xprt->state);
1575                 smp_mb__before_atomic();
1576                 clear_bit(XPRT_CONNECTED, &xprt->state);
1577                 smp_mb__after_atomic();
1578                 break;
1579         case TCP_CLOSE:
1580                 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1581                                        &transport->sock_state)) {
1582                         xs_reset_srcport(transport);
1583                         xprt_clear_connecting(xprt);
1584                 }
1585                 clear_bit(XPRT_CLOSING, &xprt->state);
1586                 /* Trigger the socket release */
1587                 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT);
1588         }
1589 }
1590
1591 static void xs_write_space(struct sock *sk)
1592 {
1593         struct sock_xprt *transport;
1594         struct rpc_xprt *xprt;
1595
1596         if (!sk->sk_socket)
1597                 return;
1598         clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1599
1600         if (unlikely(!(xprt = xprt_from_sock(sk))))
1601                 return;
1602         transport = container_of(xprt, struct sock_xprt, xprt);
1603         if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state))
1604                 return;
1605         xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE);
1606         sk->sk_write_pending--;
1607 }
1608
1609 /**
1610  * xs_udp_write_space - callback invoked when socket buffer space
1611  *                             becomes available
1612  * @sk: socket whose state has changed
1613  *
1614  * Called when more output buffer space is available for this socket.
1615  * We try not to wake our writers until they can make "significant"
1616  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1617  * with a bunch of small requests.
1618  */
1619 static void xs_udp_write_space(struct sock *sk)
1620 {
1621         /* from net/core/sock.c:sock_def_write_space */
1622         if (sock_writeable(sk))
1623                 xs_write_space(sk);
1624 }
1625
1626 /**
1627  * xs_tcp_write_space - callback invoked when socket buffer space
1628  *                             becomes available
1629  * @sk: socket whose state has changed
1630  *
1631  * Called when more output buffer space is available for this socket.
1632  * We try not to wake our writers until they can make "significant"
1633  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1634  * with a bunch of small requests.
1635  */
1636 static void xs_tcp_write_space(struct sock *sk)
1637 {
1638         /* from net/core/stream.c:sk_stream_write_space */
1639         if (sk_stream_is_writeable(sk))
1640                 xs_write_space(sk);
1641 }
1642
1643 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1644 {
1645         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1646         struct sock *sk = transport->inet;
1647
1648         if (transport->rcvsize) {
1649                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1650                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1651         }
1652         if (transport->sndsize) {
1653                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1654                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1655                 sk->sk_write_space(sk);
1656         }
1657 }
1658
1659 /**
1660  * xs_udp_set_buffer_size - set send and receive limits
1661  * @xprt: generic transport
1662  * @sndsize: requested size of send buffer, in bytes
1663  * @rcvsize: requested size of receive buffer, in bytes
1664  *
1665  * Set socket send and receive buffer size limits.
1666  */
1667 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1668 {
1669         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1670
1671         transport->sndsize = 0;
1672         if (sndsize)
1673                 transport->sndsize = sndsize + 1024;
1674         transport->rcvsize = 0;
1675         if (rcvsize)
1676                 transport->rcvsize = rcvsize + 1024;
1677
1678         xs_udp_do_set_buffer_size(xprt);
1679 }
1680
1681 /**
1682  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1683  * @xprt: controlling transport
1684  * @task: task that timed out
1685  *
1686  * Adjust the congestion window after a retransmit timeout has occurred.
1687  */
1688 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1689 {
1690         spin_lock(&xprt->transport_lock);
1691         xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1692         spin_unlock(&xprt->transport_lock);
1693 }
1694
1695 static int xs_get_random_port(void)
1696 {
1697         unsigned short min = xprt_min_resvport, max = xprt_max_resvport;
1698         unsigned short range;
1699         unsigned short rand;
1700
1701         if (max < min)
1702                 return -EADDRINUSE;
1703         range = max - min + 1;
1704         rand = get_random_u32_below(range);
1705         return rand + min;
1706 }
1707
1708 static unsigned short xs_sock_getport(struct socket *sock)
1709 {
1710         struct sockaddr_storage buf;
1711         unsigned short port = 0;
1712
1713         if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0)
1714                 goto out;
1715         switch (buf.ss_family) {
1716         case AF_INET6:
1717                 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1718                 break;
1719         case AF_INET:
1720                 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1721         }
1722 out:
1723         return port;
1724 }
1725
1726 /**
1727  * xs_set_port - reset the port number in the remote endpoint address
1728  * @xprt: generic transport
1729  * @port: new port number
1730  *
1731  */
1732 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1733 {
1734         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1735
1736         rpc_set_port(xs_addr(xprt), port);
1737         xs_update_peer_port(xprt);
1738 }
1739
1740 static void xs_reset_srcport(struct sock_xprt *transport)
1741 {
1742         transport->srcport = 0;
1743 }
1744
1745 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1746 {
1747         if (transport->srcport == 0 && transport->xprt.reuseport)
1748                 transport->srcport = xs_sock_getport(sock);
1749 }
1750
1751 static int xs_get_srcport(struct sock_xprt *transport)
1752 {
1753         int port = transport->srcport;
1754
1755         if (port == 0 && transport->xprt.resvport)
1756                 port = xs_get_random_port();
1757         return port;
1758 }
1759
1760 static unsigned short xs_sock_srcport(struct rpc_xprt *xprt)
1761 {
1762         struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1763         unsigned short ret = 0;
1764         mutex_lock(&sock->recv_mutex);
1765         if (sock->sock)
1766                 ret = xs_sock_getport(sock->sock);
1767         mutex_unlock(&sock->recv_mutex);
1768         return ret;
1769 }
1770
1771 static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen)
1772 {
1773         struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt);
1774         union {
1775                 struct sockaddr sa;
1776                 struct sockaddr_storage st;
1777         } saddr;
1778         int ret = -ENOTCONN;
1779
1780         mutex_lock(&sock->recv_mutex);
1781         if (sock->sock) {
1782                 ret = kernel_getsockname(sock->sock, &saddr.sa);
1783                 if (ret >= 0)
1784                         ret = snprintf(buf, buflen, "%pISc", &saddr.sa);
1785         }
1786         mutex_unlock(&sock->recv_mutex);
1787         return ret;
1788 }
1789
1790 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1791 {
1792         if (transport->srcport != 0)
1793                 transport->srcport = 0;
1794         if (!transport->xprt.resvport)
1795                 return 0;
1796         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1797                 return xprt_max_resvport;
1798         return --port;
1799 }
1800 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1801 {
1802         struct sockaddr_storage myaddr;
1803         int err, nloop = 0;
1804         int port = xs_get_srcport(transport);
1805         unsigned short last;
1806
1807         /*
1808          * If we are asking for any ephemeral port (i.e. port == 0 &&
1809          * transport->xprt.resvport == 0), don't bind.  Let the local
1810          * port selection happen implicitly when the socket is used
1811          * (for example at connect time).
1812          *
1813          * This ensures that we can continue to establish TCP
1814          * connections even when all local ephemeral ports are already
1815          * a part of some TCP connection.  This makes no difference
1816          * for UDP sockets, but also doesn't harm them.
1817          *
1818          * If we're asking for any reserved port (i.e. port == 0 &&
1819          * transport->xprt.resvport == 1) xs_get_srcport above will
1820          * ensure that port is non-zero and we will bind as needed.
1821          */
1822         if (port <= 0)
1823                 return port;
1824
1825         memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1826         do {
1827                 rpc_set_port((struct sockaddr *)&myaddr, port);
1828                 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1829                                 transport->xprt.addrlen);
1830                 if (err == 0) {
1831                         if (transport->xprt.reuseport)
1832                                 transport->srcport = port;
1833                         break;
1834                 }
1835                 last = port;
1836                 port = xs_next_srcport(transport, port);
1837                 if (port > last)
1838                         nloop++;
1839         } while (err == -EADDRINUSE && nloop != 2);
1840
1841         if (myaddr.ss_family == AF_INET)
1842                 dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
1843                                 &((struct sockaddr_in *)&myaddr)->sin_addr,
1844                                 port, err ? "failed" : "ok", err);
1845         else
1846                 dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
1847                                 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1848                                 port, err ? "failed" : "ok", err);
1849         return err;
1850 }
1851
1852 /*
1853  * We don't support autobind on AF_LOCAL sockets
1854  */
1855 static void xs_local_rpcbind(struct rpc_task *task)
1856 {
1857         xprt_set_bound(task->tk_xprt);
1858 }
1859
1860 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1861 {
1862 }
1863
1864 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1865 static struct lock_class_key xs_key[3];
1866 static struct lock_class_key xs_slock_key[3];
1867
1868 static inline void xs_reclassify_socketu(struct socket *sock)
1869 {
1870         struct sock *sk = sock->sk;
1871
1872         sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1873                 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]);
1874 }
1875
1876 static inline void xs_reclassify_socket4(struct socket *sock)
1877 {
1878         struct sock *sk = sock->sk;
1879
1880         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1881                 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]);
1882 }
1883
1884 static inline void xs_reclassify_socket6(struct socket *sock)
1885 {
1886         struct sock *sk = sock->sk;
1887
1888         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1889                 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]);
1890 }
1891
1892 static inline void xs_reclassify_socket(int family, struct socket *sock)
1893 {
1894         if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1895                 return;
1896
1897         switch (family) {
1898         case AF_LOCAL:
1899                 xs_reclassify_socketu(sock);
1900                 break;
1901         case AF_INET:
1902                 xs_reclassify_socket4(sock);
1903                 break;
1904         case AF_INET6:
1905                 xs_reclassify_socket6(sock);
1906                 break;
1907         }
1908 }
1909 #else
1910 static inline void xs_reclassify_socket(int family, struct socket *sock)
1911 {
1912 }
1913 #endif
1914
1915 static void xs_dummy_setup_socket(struct work_struct *work)
1916 {
1917 }
1918
1919 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1920                 struct sock_xprt *transport, int family, int type,
1921                 int protocol, bool reuseport)
1922 {
1923         struct file *filp;
1924         struct socket *sock;
1925         int err;
1926
1927         err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1928         if (err < 0) {
1929                 dprintk("RPC:       can't create %d transport socket (%d).\n",
1930                                 protocol, -err);
1931                 goto out;
1932         }
1933         xs_reclassify_socket(family, sock);
1934
1935         if (reuseport)
1936                 sock_set_reuseport(sock->sk);
1937
1938         err = xs_bind(transport, sock);
1939         if (err) {
1940                 sock_release(sock);
1941                 goto out;
1942         }
1943
1944         if (protocol == IPPROTO_TCP) {
1945                 __netns_tracker_free(xprt->xprt_net, &sock->sk->ns_tracker, false);
1946                 sock->sk->sk_net_refcnt = 1;
1947                 get_net_track(xprt->xprt_net, &sock->sk->ns_tracker, GFP_KERNEL);
1948                 sock_inuse_add(xprt->xprt_net, 1);
1949         }
1950
1951         filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
1952         if (IS_ERR(filp))
1953                 return ERR_CAST(filp);
1954         transport->file = filp;
1955
1956         return sock;
1957 out:
1958         return ERR_PTR(err);
1959 }
1960
1961 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1962                                       struct socket *sock)
1963 {
1964         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1965                                                                         xprt);
1966
1967         if (!transport->inet) {
1968                 struct sock *sk = sock->sk;
1969
1970                 lock_sock(sk);
1971
1972                 xs_save_old_callbacks(transport, sk);
1973
1974                 sk->sk_user_data = xprt;
1975                 sk->sk_data_ready = xs_data_ready;
1976                 sk->sk_write_space = xs_udp_write_space;
1977                 sk->sk_state_change = xs_local_state_change;
1978                 sk->sk_error_report = xs_error_report;
1979                 sk->sk_use_task_frag = false;
1980
1981                 xprt_clear_connected(xprt);
1982
1983                 /* Reset to new socket */
1984                 transport->sock = sock;
1985                 transport->inet = sk;
1986
1987                 release_sock(sk);
1988         }
1989
1990         xs_stream_start_connect(transport);
1991
1992         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1993 }
1994
1995 /**
1996  * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1997  * @transport: socket transport to connect
1998  */
1999 static int xs_local_setup_socket(struct sock_xprt *transport)
2000 {
2001         struct rpc_xprt *xprt = &transport->xprt;
2002         struct file *filp;
2003         struct socket *sock;
2004         int status;
2005
2006         status = __sock_create(xprt->xprt_net, AF_LOCAL,
2007                                         SOCK_STREAM, 0, &sock, 1);
2008         if (status < 0) {
2009                 dprintk("RPC:       can't create AF_LOCAL "
2010                         "transport socket (%d).\n", -status);
2011                 goto out;
2012         }
2013         xs_reclassify_socket(AF_LOCAL, sock);
2014
2015         filp = sock_alloc_file(sock, O_NONBLOCK, NULL);
2016         if (IS_ERR(filp)) {
2017                 status = PTR_ERR(filp);
2018                 goto out;
2019         }
2020         transport->file = filp;
2021
2022         dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
2023                         xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2024
2025         status = xs_local_finish_connecting(xprt, sock);
2026         trace_rpc_socket_connect(xprt, sock, status);
2027         switch (status) {
2028         case 0:
2029                 dprintk("RPC:       xprt %p connected to %s\n",
2030                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2031                 xprt->stat.connect_count++;
2032                 xprt->stat.connect_time += (long)jiffies -
2033                                            xprt->stat.connect_start;
2034                 xprt_set_connected(xprt);
2035                 break;
2036         case -ENOBUFS:
2037                 break;
2038         case -ENOENT:
2039                 dprintk("RPC:       xprt %p: socket %s does not exist\n",
2040                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2041                 break;
2042         case -ECONNREFUSED:
2043                 dprintk("RPC:       xprt %p: connection refused for %s\n",
2044                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2045                 break;
2046         default:
2047                 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2048                                 __func__, -status,
2049                                 xprt->address_strings[RPC_DISPLAY_ADDR]);
2050         }
2051
2052 out:
2053         xprt_clear_connecting(xprt);
2054         xprt_wake_pending_tasks(xprt, status);
2055         return status;
2056 }
2057
2058 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2059 {
2060         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2061         int ret;
2062
2063         if (transport->file)
2064                 goto force_disconnect;
2065
2066         if (RPC_IS_ASYNC(task)) {
2067                 /*
2068                  * We want the AF_LOCAL connect to be resolved in the
2069                  * filesystem namespace of the process making the rpc
2070                  * call.  Thus we connect synchronously.
2071                  *
2072                  * If we want to support asynchronous AF_LOCAL calls,
2073                  * we'll need to figure out how to pass a namespace to
2074                  * connect.
2075                  */
2076                 rpc_task_set_rpc_status(task, -ENOTCONN);
2077                 goto out_wake;
2078         }
2079         ret = xs_local_setup_socket(transport);
2080         if (ret && !RPC_IS_SOFTCONN(task))
2081                 msleep_interruptible(15000);
2082         return;
2083 force_disconnect:
2084         xprt_force_disconnect(xprt);
2085 out_wake:
2086         xprt_clear_connecting(xprt);
2087         xprt_wake_pending_tasks(xprt, -ENOTCONN);
2088 }
2089
2090 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2091 /*
2092  * Note that this should be called with XPRT_LOCKED held, or recv_mutex
2093  * held, or when we otherwise know that we have exclusive access to the
2094  * socket, to guard against races with xs_reset_transport.
2095  */
2096 static void xs_set_memalloc(struct rpc_xprt *xprt)
2097 {
2098         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2099                         xprt);
2100
2101         /*
2102          * If there's no sock, then we have nothing to set. The
2103          * reconnecting process will get it for us.
2104          */
2105         if (!transport->inet)
2106                 return;
2107         if (atomic_read(&xprt->swapper))
2108                 sk_set_memalloc(transport->inet);
2109 }
2110
2111 /**
2112  * xs_enable_swap - Tag this transport as being used for swap.
2113  * @xprt: transport to tag
2114  *
2115  * Take a reference to this transport on behalf of the rpc_clnt, and
2116  * optionally mark it for swapping if it wasn't already.
2117  */
2118 static int
2119 xs_enable_swap(struct rpc_xprt *xprt)
2120 {
2121         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2122
2123         mutex_lock(&xs->recv_mutex);
2124         if (atomic_inc_return(&xprt->swapper) == 1 &&
2125             xs->inet)
2126                 sk_set_memalloc(xs->inet);
2127         mutex_unlock(&xs->recv_mutex);
2128         return 0;
2129 }
2130
2131 /**
2132  * xs_disable_swap - Untag this transport as being used for swap.
2133  * @xprt: transport to tag
2134  *
2135  * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2136  * swapper refcount goes to 0, untag the socket as a memalloc socket.
2137  */
2138 static void
2139 xs_disable_swap(struct rpc_xprt *xprt)
2140 {
2141         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2142
2143         mutex_lock(&xs->recv_mutex);
2144         if (atomic_dec_and_test(&xprt->swapper) &&
2145             xs->inet)
2146                 sk_clear_memalloc(xs->inet);
2147         mutex_unlock(&xs->recv_mutex);
2148 }
2149 #else
2150 static void xs_set_memalloc(struct rpc_xprt *xprt)
2151 {
2152 }
2153
2154 static int
2155 xs_enable_swap(struct rpc_xprt *xprt)
2156 {
2157         return -EINVAL;
2158 }
2159
2160 static void
2161 xs_disable_swap(struct rpc_xprt *xprt)
2162 {
2163 }
2164 #endif
2165
2166 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2167 {
2168         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2169
2170         if (!transport->inet) {
2171                 struct sock *sk = sock->sk;
2172
2173                 lock_sock(sk);
2174
2175                 xs_save_old_callbacks(transport, sk);
2176
2177                 sk->sk_user_data = xprt;
2178                 sk->sk_data_ready = xs_data_ready;
2179                 sk->sk_write_space = xs_udp_write_space;
2180                 sk->sk_use_task_frag = false;
2181
2182                 xprt_set_connected(xprt);
2183
2184                 /* Reset to new socket */
2185                 transport->sock = sock;
2186                 transport->inet = sk;
2187
2188                 xs_set_memalloc(xprt);
2189
2190                 release_sock(sk);
2191         }
2192         xs_udp_do_set_buffer_size(xprt);
2193
2194         xprt->stat.connect_start = jiffies;
2195 }
2196
2197 static void xs_udp_setup_socket(struct work_struct *work)
2198 {
2199         struct sock_xprt *transport =
2200                 container_of(work, struct sock_xprt, connect_worker.work);
2201         struct rpc_xprt *xprt = &transport->xprt;
2202         struct socket *sock;
2203         int status = -EIO;
2204         unsigned int pflags = current->flags;
2205
2206         if (atomic_read(&xprt->swapper))
2207                 current->flags |= PF_MEMALLOC;
2208         sock = xs_create_sock(xprt, transport,
2209                         xs_addr(xprt)->sa_family, SOCK_DGRAM,
2210                         IPPROTO_UDP, false);
2211         if (IS_ERR(sock))
2212                 goto out;
2213
2214         dprintk("RPC:       worker connecting xprt %p via %s to "
2215                                 "%s (port %s)\n", xprt,
2216                         xprt->address_strings[RPC_DISPLAY_PROTO],
2217                         xprt->address_strings[RPC_DISPLAY_ADDR],
2218                         xprt->address_strings[RPC_DISPLAY_PORT]);
2219
2220         xs_udp_finish_connecting(xprt, sock);
2221         trace_rpc_socket_connect(xprt, sock, 0);
2222         status = 0;
2223 out:
2224         xprt_clear_connecting(xprt);
2225         xprt_unlock_connect(xprt, transport);
2226         xprt_wake_pending_tasks(xprt, status);
2227         current_restore_flags(pflags, PF_MEMALLOC);
2228 }
2229
2230 /**
2231  * xs_tcp_shutdown - gracefully shut down a TCP socket
2232  * @xprt: transport
2233  *
2234  * Initiates a graceful shutdown of the TCP socket by calling the
2235  * equivalent of shutdown(SHUT_RDWR);
2236  */
2237 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2238 {
2239         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2240         struct socket *sock = transport->sock;
2241         int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
2242
2243         if (sock == NULL)
2244                 return;
2245         if (!xprt->reuseport) {
2246                 xs_close(xprt);
2247                 return;
2248         }
2249         switch (skst) {
2250         case TCP_FIN_WAIT1:
2251         case TCP_FIN_WAIT2:
2252         case TCP_LAST_ACK:
2253                 break;
2254         case TCP_ESTABLISHED:
2255         case TCP_CLOSE_WAIT:
2256                 kernel_sock_shutdown(sock, SHUT_RDWR);
2257                 trace_rpc_socket_shutdown(xprt, sock);
2258                 break;
2259         default:
2260                 xs_reset_transport(transport);
2261         }
2262 }
2263
2264 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
2265                 struct socket *sock)
2266 {
2267         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2268         struct net *net = sock_net(sock->sk);
2269         unsigned long connect_timeout;
2270         unsigned long syn_retries;
2271         unsigned int keepidle;
2272         unsigned int keepcnt;
2273         unsigned int timeo;
2274         unsigned long t;
2275
2276         spin_lock(&xprt->transport_lock);
2277         keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ);
2278         keepcnt = xprt->timeout->to_retries + 1;
2279         timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2280                 (xprt->timeout->to_retries + 1);
2281         clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2282         spin_unlock(&xprt->transport_lock);
2283
2284         /* TCP Keepalive options */
2285         sock_set_keepalive(sock->sk);
2286         tcp_sock_set_keepidle(sock->sk, keepidle);
2287         tcp_sock_set_keepintvl(sock->sk, keepidle);
2288         tcp_sock_set_keepcnt(sock->sk, keepcnt);
2289
2290         /* TCP user timeout (see RFC5482) */
2291         tcp_sock_set_user_timeout(sock->sk, timeo);
2292
2293         /* Connect timeout */
2294         connect_timeout = max_t(unsigned long,
2295                                 DIV_ROUND_UP(xprt->connect_timeout, HZ), 1);
2296         syn_retries = max_t(unsigned long,
2297                             READ_ONCE(net->ipv4.sysctl_tcp_syn_retries), 1);
2298         for (t = 0; t <= syn_retries && (1UL << t) < connect_timeout; t++)
2299                 ;
2300         if (t <= syn_retries)
2301                 tcp_sock_set_syncnt(sock->sk, t - 1);
2302 }
2303
2304 static void xs_tcp_do_set_connect_timeout(struct rpc_xprt *xprt,
2305                                           unsigned long connect_timeout)
2306 {
2307         struct sock_xprt *transport =
2308                 container_of(xprt, struct sock_xprt, xprt);
2309         struct rpc_timeout to;
2310         unsigned long initval;
2311
2312         memcpy(&to, xprt->timeout, sizeof(to));
2313         /* Arbitrary lower limit */
2314         initval = max_t(unsigned long, connect_timeout, XS_TCP_INIT_REEST_TO);
2315         to.to_initval = initval;
2316         to.to_maxval = initval;
2317         to.to_retries = 0;
2318         memcpy(&transport->tcp_timeout, &to, sizeof(transport->tcp_timeout));
2319         xprt->timeout = &transport->tcp_timeout;
2320         xprt->connect_timeout = connect_timeout;
2321 }
2322
2323 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt,
2324                 unsigned long connect_timeout,
2325                 unsigned long reconnect_timeout)
2326 {
2327         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2328
2329         spin_lock(&xprt->transport_lock);
2330         if (reconnect_timeout < xprt->max_reconnect_timeout)
2331                 xprt->max_reconnect_timeout = reconnect_timeout;
2332         if (connect_timeout < xprt->connect_timeout)
2333                 xs_tcp_do_set_connect_timeout(xprt, connect_timeout);
2334         set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state);
2335         spin_unlock(&xprt->transport_lock);
2336 }
2337
2338 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2339 {
2340         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2341
2342         if (!transport->inet) {
2343                 struct sock *sk = sock->sk;
2344
2345                 /* Avoid temporary address, they are bad for long-lived
2346                  * connections such as NFS mounts.
2347                  * RFC4941, section 3.6 suggests that:
2348                  *    Individual applications, which have specific
2349                  *    knowledge about the normal duration of connections,
2350                  *    MAY override this as appropriate.
2351                  */
2352                 if (xs_addr(xprt)->sa_family == PF_INET6) {
2353                         ip6_sock_set_addr_preferences(sk,
2354                                 IPV6_PREFER_SRC_PUBLIC);
2355                 }
2356
2357                 xs_tcp_set_socket_timeouts(xprt, sock);
2358                 tcp_sock_set_nodelay(sk);
2359
2360                 lock_sock(sk);
2361
2362                 xs_save_old_callbacks(transport, sk);
2363
2364                 sk->sk_user_data = xprt;
2365                 sk->sk_data_ready = xs_data_ready;
2366                 sk->sk_state_change = xs_tcp_state_change;
2367                 sk->sk_write_space = xs_tcp_write_space;
2368                 sk->sk_error_report = xs_error_report;
2369                 sk->sk_use_task_frag = false;
2370
2371                 /* socket options */
2372                 sock_reset_flag(sk, SOCK_LINGER);
2373
2374                 xprt_clear_connected(xprt);
2375
2376                 /* Reset to new socket */
2377                 transport->sock = sock;
2378                 transport->inet = sk;
2379
2380                 release_sock(sk);
2381         }
2382
2383         if (!xprt_bound(xprt))
2384                 return -ENOTCONN;
2385
2386         xs_set_memalloc(xprt);
2387
2388         xs_stream_start_connect(transport);
2389
2390         /* Tell the socket layer to start connecting... */
2391         set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2392         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2393 }
2394
2395 /**
2396  * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2397  * @work: queued work item
2398  *
2399  * Invoked by a work queue tasklet.
2400  */
2401 static void xs_tcp_setup_socket(struct work_struct *work)
2402 {
2403         struct sock_xprt *transport =
2404                 container_of(work, struct sock_xprt, connect_worker.work);
2405         struct socket *sock = transport->sock;
2406         struct rpc_xprt *xprt = &transport->xprt;
2407         int status;
2408         unsigned int pflags = current->flags;
2409
2410         if (atomic_read(&xprt->swapper))
2411                 current->flags |= PF_MEMALLOC;
2412
2413         if (xprt_connected(xprt))
2414                 goto out;
2415         if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
2416                                &transport->sock_state) ||
2417             !sock) {
2418                 xs_reset_transport(transport);
2419                 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
2420                                       SOCK_STREAM, IPPROTO_TCP, true);
2421                 if (IS_ERR(sock)) {
2422                         xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
2423                         goto out;
2424                 }
2425         }
2426
2427         dprintk("RPC:       worker connecting xprt %p via %s to "
2428                                 "%s (port %s)\n", xprt,
2429                         xprt->address_strings[RPC_DISPLAY_PROTO],
2430                         xprt->address_strings[RPC_DISPLAY_ADDR],
2431                         xprt->address_strings[RPC_DISPLAY_PORT]);
2432
2433         status = xs_tcp_finish_connecting(xprt, sock);
2434         trace_rpc_socket_connect(xprt, sock, status);
2435         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
2436                         xprt, -status, xprt_connected(xprt),
2437                         sock->sk->sk_state);
2438         switch (status) {
2439         case 0:
2440         case -EINPROGRESS:
2441                 /* SYN_SENT! */
2442                 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
2443                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2444                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2445                 fallthrough;
2446         case -EALREADY:
2447                 goto out_unlock;
2448         case -EADDRNOTAVAIL:
2449                 /* Source port number is unavailable. Try a new one! */
2450                 transport->srcport = 0;
2451                 status = -EAGAIN;
2452                 break;
2453         case -EPERM:
2454                 /* Happens, for instance, if a BPF program is preventing
2455                  * the connect. Remap the error so upper layers can better
2456                  * deal with it.
2457                  */
2458                 status = -ECONNREFUSED;
2459                 fallthrough;
2460         case -EINVAL:
2461                 /* Happens, for instance, if the user specified a link
2462                  * local IPv6 address without a scope-id.
2463                  */
2464         case -ECONNREFUSED:
2465         case -ECONNRESET:
2466         case -ENETDOWN:
2467         case -ENETUNREACH:
2468         case -EHOSTUNREACH:
2469         case -EADDRINUSE:
2470         case -ENOBUFS:
2471         case -ENOTCONN:
2472                 break;
2473         default:
2474                 printk("%s: connect returned unhandled error %d\n",
2475                         __func__, status);
2476                 status = -EAGAIN;
2477         }
2478
2479         /* xs_tcp_force_close() wakes tasks with a fixed error code.
2480          * We need to wake them first to ensure the correct error code.
2481          */
2482         xprt_wake_pending_tasks(xprt, status);
2483         xs_tcp_force_close(xprt);
2484 out:
2485         xprt_clear_connecting(xprt);
2486 out_unlock:
2487         xprt_unlock_connect(xprt, transport);
2488         current_restore_flags(pflags, PF_MEMALLOC);
2489 }
2490
2491 /*
2492  * Transfer the connected socket to @upper_transport, then mark that
2493  * xprt CONNECTED.
2494  */
2495 static int xs_tcp_tls_finish_connecting(struct rpc_xprt *lower_xprt,
2496                                         struct sock_xprt *upper_transport)
2497 {
2498         struct sock_xprt *lower_transport =
2499                         container_of(lower_xprt, struct sock_xprt, xprt);
2500         struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2501
2502         if (!upper_transport->inet) {
2503                 struct socket *sock = lower_transport->sock;
2504                 struct sock *sk = sock->sk;
2505
2506                 /* Avoid temporary address, they are bad for long-lived
2507                  * connections such as NFS mounts.
2508                  * RFC4941, section 3.6 suggests that:
2509                  *    Individual applications, which have specific
2510                  *    knowledge about the normal duration of connections,
2511                  *    MAY override this as appropriate.
2512                  */
2513                 if (xs_addr(upper_xprt)->sa_family == PF_INET6)
2514                         ip6_sock_set_addr_preferences(sk, IPV6_PREFER_SRC_PUBLIC);
2515
2516                 xs_tcp_set_socket_timeouts(upper_xprt, sock);
2517                 tcp_sock_set_nodelay(sk);
2518
2519                 lock_sock(sk);
2520
2521                 /* @sk is already connected, so it now has the RPC callbacks.
2522                  * Reach into @lower_transport to save the original ones.
2523                  */
2524                 upper_transport->old_data_ready = lower_transport->old_data_ready;
2525                 upper_transport->old_state_change = lower_transport->old_state_change;
2526                 upper_transport->old_write_space = lower_transport->old_write_space;
2527                 upper_transport->old_error_report = lower_transport->old_error_report;
2528                 sk->sk_user_data = upper_xprt;
2529
2530                 /* socket options */
2531                 sock_reset_flag(sk, SOCK_LINGER);
2532
2533                 xprt_clear_connected(upper_xprt);
2534
2535                 upper_transport->sock = sock;
2536                 upper_transport->inet = sk;
2537                 upper_transport->file = lower_transport->file;
2538
2539                 release_sock(sk);
2540
2541                 /* Reset lower_transport before shutting down its clnt */
2542                 mutex_lock(&lower_transport->recv_mutex);
2543                 lower_transport->inet = NULL;
2544                 lower_transport->sock = NULL;
2545                 lower_transport->file = NULL;
2546
2547                 xprt_clear_connected(lower_xprt);
2548                 xs_sock_reset_connection_flags(lower_xprt);
2549                 xs_stream_reset_connect(lower_transport);
2550                 mutex_unlock(&lower_transport->recv_mutex);
2551         }
2552
2553         if (!xprt_bound(upper_xprt))
2554                 return -ENOTCONN;
2555
2556         xs_set_memalloc(upper_xprt);
2557
2558         if (!xprt_test_and_set_connected(upper_xprt)) {
2559                 upper_xprt->connect_cookie++;
2560                 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2561                 xprt_clear_connecting(upper_xprt);
2562
2563                 upper_xprt->stat.connect_count++;
2564                 upper_xprt->stat.connect_time += (long)jiffies -
2565                                            upper_xprt->stat.connect_start;
2566                 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2567         }
2568         return 0;
2569 }
2570
2571 /**
2572  * xs_tls_handshake_done - TLS handshake completion handler
2573  * @data: address of xprt to wake
2574  * @status: status of handshake
2575  * @peerid: serial number of key containing the remote's identity
2576  *
2577  */
2578 static void xs_tls_handshake_done(void *data, int status, key_serial_t peerid)
2579 {
2580         struct rpc_xprt *lower_xprt = data;
2581         struct sock_xprt *lower_transport =
2582                                 container_of(lower_xprt, struct sock_xprt, xprt);
2583
2584         lower_transport->xprt_err = status ? -EACCES : 0;
2585         complete(&lower_transport->handshake_done);
2586         xprt_put(lower_xprt);
2587 }
2588
2589 static int xs_tls_handshake_sync(struct rpc_xprt *lower_xprt, struct xprtsec_parms *xprtsec)
2590 {
2591         struct sock_xprt *lower_transport =
2592                                 container_of(lower_xprt, struct sock_xprt, xprt);
2593         struct tls_handshake_args args = {
2594                 .ta_sock        = lower_transport->sock,
2595                 .ta_done        = xs_tls_handshake_done,
2596                 .ta_data        = xprt_get(lower_xprt),
2597                 .ta_peername    = lower_xprt->servername,
2598         };
2599         struct sock *sk = lower_transport->inet;
2600         int rc;
2601
2602         init_completion(&lower_transport->handshake_done);
2603         set_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2604         lower_transport->xprt_err = -ETIMEDOUT;
2605         switch (xprtsec->policy) {
2606         case RPC_XPRTSEC_TLS_ANON:
2607                 rc = tls_client_hello_anon(&args, GFP_KERNEL);
2608                 if (rc)
2609                         goto out_put_xprt;
2610                 break;
2611         case RPC_XPRTSEC_TLS_X509:
2612                 args.ta_my_cert = xprtsec->cert_serial;
2613                 args.ta_my_privkey = xprtsec->privkey_serial;
2614                 rc = tls_client_hello_x509(&args, GFP_KERNEL);
2615                 if (rc)
2616                         goto out_put_xprt;
2617                 break;
2618         default:
2619                 rc = -EACCES;
2620                 goto out_put_xprt;
2621         }
2622
2623         rc = wait_for_completion_interruptible_timeout(&lower_transport->handshake_done,
2624                                                        XS_TLS_HANDSHAKE_TO);
2625         if (rc <= 0) {
2626                 tls_handshake_cancel(sk);
2627                 if (rc == 0)
2628                         rc = -ETIMEDOUT;
2629                 goto out_put_xprt;
2630         }
2631
2632         rc = lower_transport->xprt_err;
2633
2634 out:
2635         xs_stream_reset_connect(lower_transport);
2636         clear_bit(XPRT_SOCK_IGNORE_RECV, &lower_transport->sock_state);
2637         return rc;
2638
2639 out_put_xprt:
2640         xprt_put(lower_xprt);
2641         goto out;
2642 }
2643
2644 /**
2645  * xs_tcp_tls_setup_socket - establish a TLS session on a TCP socket
2646  * @work: queued work item
2647  *
2648  * Invoked by a work queue tasklet.
2649  *
2650  * For RPC-with-TLS, there is a two-stage connection process.
2651  *
2652  * The "upper-layer xprt" is visible to the RPC consumer. Once it has
2653  * been marked connected, the consumer knows that a TCP connection and
2654  * a TLS session have been established.
2655  *
2656  * A "lower-layer xprt", created in this function, handles the mechanics
2657  * of connecting the TCP socket, performing the RPC_AUTH_TLS probe, and
2658  * then driving the TLS handshake. Once all that is complete, the upper
2659  * layer xprt is marked connected.
2660  */
2661 static void xs_tcp_tls_setup_socket(struct work_struct *work)
2662 {
2663         struct sock_xprt *upper_transport =
2664                 container_of(work, struct sock_xprt, connect_worker.work);
2665         struct rpc_clnt *upper_clnt = upper_transport->clnt;
2666         struct rpc_xprt *upper_xprt = &upper_transport->xprt;
2667         struct rpc_create_args args = {
2668                 .net            = upper_xprt->xprt_net,
2669                 .protocol       = upper_xprt->prot,
2670                 .address        = (struct sockaddr *)&upper_xprt->addr,
2671                 .addrsize       = upper_xprt->addrlen,
2672                 .timeout        = upper_clnt->cl_timeout,
2673                 .servername     = upper_xprt->servername,
2674                 .program        = upper_clnt->cl_program,
2675                 .prognumber     = upper_clnt->cl_prog,
2676                 .version        = upper_clnt->cl_vers,
2677                 .authflavor     = RPC_AUTH_TLS,
2678                 .cred           = upper_clnt->cl_cred,
2679                 .xprtsec        = {
2680                         .policy         = RPC_XPRTSEC_NONE,
2681                 },
2682                 .stats          = upper_clnt->cl_stats,
2683         };
2684         unsigned int pflags = current->flags;
2685         struct rpc_clnt *lower_clnt;
2686         struct rpc_xprt *lower_xprt;
2687         int status;
2688
2689         if (atomic_read(&upper_xprt->swapper))
2690                 current->flags |= PF_MEMALLOC;
2691
2692         xs_stream_start_connect(upper_transport);
2693
2694         /* This implicitly sends an RPC_AUTH_TLS probe */
2695         lower_clnt = rpc_create(&args);
2696         if (IS_ERR(lower_clnt)) {
2697                 trace_rpc_tls_unavailable(upper_clnt, upper_xprt);
2698                 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2699                 xprt_clear_connecting(upper_xprt);
2700                 xprt_wake_pending_tasks(upper_xprt, PTR_ERR(lower_clnt));
2701                 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2702                 goto out_unlock;
2703         }
2704
2705         /* RPC_AUTH_TLS probe was successful. Try a TLS handshake on
2706          * the lower xprt.
2707          */
2708         rcu_read_lock();
2709         lower_xprt = rcu_dereference(lower_clnt->cl_xprt);
2710         rcu_read_unlock();
2711
2712         if (wait_on_bit_lock(&lower_xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2713                 goto out_unlock;
2714
2715         status = xs_tls_handshake_sync(lower_xprt, &upper_xprt->xprtsec);
2716         if (status) {
2717                 trace_rpc_tls_not_started(upper_clnt, upper_xprt);
2718                 goto out_close;
2719         }
2720
2721         status = xs_tcp_tls_finish_connecting(lower_xprt, upper_transport);
2722         if (status)
2723                 goto out_close;
2724         xprt_release_write(lower_xprt, NULL);
2725
2726         trace_rpc_socket_connect(upper_xprt, upper_transport->sock, 0);
2727         if (!xprt_test_and_set_connected(upper_xprt)) {
2728                 upper_xprt->connect_cookie++;
2729                 clear_bit(XPRT_SOCK_CONNECTING, &upper_transport->sock_state);
2730                 xprt_clear_connecting(upper_xprt);
2731
2732                 upper_xprt->stat.connect_count++;
2733                 upper_xprt->stat.connect_time += (long)jiffies -
2734                                            upper_xprt->stat.connect_start;
2735                 xs_run_error_worker(upper_transport, XPRT_SOCK_WAKE_PENDING);
2736         }
2737         rpc_shutdown_client(lower_clnt);
2738
2739 out_unlock:
2740         current_restore_flags(pflags, PF_MEMALLOC);
2741         upper_transport->clnt = NULL;
2742         xprt_unlock_connect(upper_xprt, upper_transport);
2743         return;
2744
2745 out_close:
2746         xprt_release_write(lower_xprt, NULL);
2747         rpc_shutdown_client(lower_clnt);
2748
2749         /* xprt_force_disconnect() wakes tasks with a fixed tk_status code.
2750          * Wake them first here to ensure they get our tk_status code.
2751          */
2752         xprt_wake_pending_tasks(upper_xprt, status);
2753         xs_tcp_force_close(upper_xprt);
2754         xprt_clear_connecting(upper_xprt);
2755         goto out_unlock;
2756 }
2757
2758 /**
2759  * xs_connect - connect a socket to a remote endpoint
2760  * @xprt: pointer to transport structure
2761  * @task: address of RPC task that manages state of connect request
2762  *
2763  * TCP: If the remote end dropped the connection, delay reconnecting.
2764  *
2765  * UDP socket connects are synchronous, but we use a work queue anyway
2766  * to guarantee that even unprivileged user processes can set up a
2767  * socket on a privileged port.
2768  *
2769  * If a UDP socket connect fails, the delay behavior here prevents
2770  * retry floods (hard mounts).
2771  */
2772 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2773 {
2774         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2775         unsigned long delay = 0;
2776
2777         WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2778
2779         if (transport->sock != NULL) {
2780                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
2781                         "seconds\n", xprt, xprt->reestablish_timeout / HZ);
2782
2783                 delay = xprt_reconnect_delay(xprt);
2784                 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
2785
2786         } else
2787                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
2788
2789         transport->clnt = task->tk_client;
2790         queue_delayed_work(xprtiod_workqueue,
2791                         &transport->connect_worker,
2792                         delay);
2793 }
2794
2795 static void xs_wake_disconnect(struct sock_xprt *transport)
2796 {
2797         if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state))
2798                 xs_tcp_force_close(&transport->xprt);
2799 }
2800
2801 static void xs_wake_write(struct sock_xprt *transport)
2802 {
2803         if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state))
2804                 xprt_write_space(&transport->xprt);
2805 }
2806
2807 static void xs_wake_error(struct sock_xprt *transport)
2808 {
2809         int sockerr;
2810
2811         if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state))
2812                 return;
2813         sockerr = xchg(&transport->xprt_err, 0);
2814         if (sockerr < 0) {
2815                 xprt_wake_pending_tasks(&transport->xprt, sockerr);
2816                 xs_tcp_force_close(&transport->xprt);
2817         }
2818 }
2819
2820 static void xs_wake_pending(struct sock_xprt *transport)
2821 {
2822         if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state))
2823                 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN);
2824 }
2825
2826 static void xs_error_handle(struct work_struct *work)
2827 {
2828         struct sock_xprt *transport = container_of(work,
2829                         struct sock_xprt, error_worker);
2830
2831         xs_wake_disconnect(transport);
2832         xs_wake_write(transport);
2833         xs_wake_error(transport);
2834         xs_wake_pending(transport);
2835 }
2836
2837 /**
2838  * xs_local_print_stats - display AF_LOCAL socket-specific stats
2839  * @xprt: rpc_xprt struct containing statistics
2840  * @seq: output file
2841  *
2842  */
2843 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2844 {
2845         long idle_time = 0;
2846
2847         if (xprt_connected(xprt))
2848                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2849
2850         seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2851                         "%llu %llu %lu %llu %llu\n",
2852                         xprt->stat.bind_count,
2853                         xprt->stat.connect_count,
2854                         xprt->stat.connect_time / HZ,
2855                         idle_time,
2856                         xprt->stat.sends,
2857                         xprt->stat.recvs,
2858                         xprt->stat.bad_xids,
2859                         xprt->stat.req_u,
2860                         xprt->stat.bklog_u,
2861                         xprt->stat.max_slots,
2862                         xprt->stat.sending_u,
2863                         xprt->stat.pending_u);
2864 }
2865
2866 /**
2867  * xs_udp_print_stats - display UDP socket-specific stats
2868  * @xprt: rpc_xprt struct containing statistics
2869  * @seq: output file
2870  *
2871  */
2872 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2873 {
2874         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2875
2876         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2877                         "%lu %llu %llu\n",
2878                         transport->srcport,
2879                         xprt->stat.bind_count,
2880                         xprt->stat.sends,
2881                         xprt->stat.recvs,
2882                         xprt->stat.bad_xids,
2883                         xprt->stat.req_u,
2884                         xprt->stat.bklog_u,
2885                         xprt->stat.max_slots,
2886                         xprt->stat.sending_u,
2887                         xprt->stat.pending_u);
2888 }
2889
2890 /**
2891  * xs_tcp_print_stats - display TCP socket-specific stats
2892  * @xprt: rpc_xprt struct containing statistics
2893  * @seq: output file
2894  *
2895  */
2896 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2897 {
2898         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2899         long idle_time = 0;
2900
2901         if (xprt_connected(xprt))
2902                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2903
2904         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2905                         "%llu %llu %lu %llu %llu\n",
2906                         transport->srcport,
2907                         xprt->stat.bind_count,
2908                         xprt->stat.connect_count,
2909                         xprt->stat.connect_time / HZ,
2910                         idle_time,
2911                         xprt->stat.sends,
2912                         xprt->stat.recvs,
2913                         xprt->stat.bad_xids,
2914                         xprt->stat.req_u,
2915                         xprt->stat.bklog_u,
2916                         xprt->stat.max_slots,
2917                         xprt->stat.sending_u,
2918                         xprt->stat.pending_u);
2919 }
2920
2921 /*
2922  * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2923  * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2924  * to use the server side send routines.
2925  */
2926 static int bc_malloc(struct rpc_task *task)
2927 {
2928         struct rpc_rqst *rqst = task->tk_rqstp;
2929         size_t size = rqst->rq_callsize;
2930         struct page *page;
2931         struct rpc_buffer *buf;
2932
2933         if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) {
2934                 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n",
2935                           size);
2936                 return -EINVAL;
2937         }
2938
2939         page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
2940         if (!page)
2941                 return -ENOMEM;
2942
2943         buf = page_address(page);
2944         buf->len = PAGE_SIZE;
2945
2946         rqst->rq_buffer = buf->data;
2947         rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize;
2948         return 0;
2949 }
2950
2951 /*
2952  * Free the space allocated in the bc_alloc routine
2953  */
2954 static void bc_free(struct rpc_task *task)
2955 {
2956         void *buffer = task->tk_rqstp->rq_buffer;
2957         struct rpc_buffer *buf;
2958
2959         buf = container_of(buffer, struct rpc_buffer, data);
2960         free_page((unsigned long)buf);
2961 }
2962
2963 static int bc_sendto(struct rpc_rqst *req)
2964 {
2965         struct xdr_buf *xdr = &req->rq_snd_buf;
2966         struct sock_xprt *transport =
2967                         container_of(req->rq_xprt, struct sock_xprt, xprt);
2968         struct msghdr msg = {
2969                 .msg_flags      = 0,
2970         };
2971         rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT |
2972                                          (u32)xdr->len);
2973         unsigned int sent = 0;
2974         int err;
2975
2976         req->rq_xtime = ktime_get();
2977         err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask());
2978         if (err < 0)
2979                 return err;
2980         err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent);
2981         xdr_free_bvec(xdr);
2982         if (err < 0 || sent != (xdr->len + sizeof(marker)))
2983                 return -EAGAIN;
2984         return sent;
2985 }
2986
2987 /**
2988  * bc_send_request - Send a backchannel Call on a TCP socket
2989  * @req: rpc_rqst containing Call message to be sent
2990  *
2991  * xpt_mutex ensures @rqstp's whole message is written to the socket
2992  * without interruption.
2993  *
2994  * Return values:
2995  *   %0 if the message was sent successfully
2996  *   %ENOTCONN if the message was not sent
2997  */
2998 static int bc_send_request(struct rpc_rqst *req)
2999 {
3000         struct svc_xprt *xprt;
3001         int len;
3002
3003         /*
3004          * Get the server socket associated with this callback xprt
3005          */
3006         xprt = req->rq_xprt->bc_xprt;
3007
3008         /*
3009          * Grab the mutex to serialize data as the connection is shared
3010          * with the fore channel
3011          */
3012         mutex_lock(&xprt->xpt_mutex);
3013         if (test_bit(XPT_DEAD, &xprt->xpt_flags))
3014                 len = -ENOTCONN;
3015         else
3016                 len = bc_sendto(req);
3017         mutex_unlock(&xprt->xpt_mutex);
3018
3019         if (len > 0)
3020                 len = 0;
3021
3022         return len;
3023 }
3024
3025 static void bc_close(struct rpc_xprt *xprt)
3026 {
3027         xprt_disconnect_done(xprt);
3028 }
3029
3030 static void bc_destroy(struct rpc_xprt *xprt)
3031 {
3032         dprintk("RPC:       bc_destroy xprt %p\n", xprt);
3033
3034         xs_xprt_free(xprt);
3035         module_put(THIS_MODULE);
3036 }
3037
3038 static const struct rpc_xprt_ops xs_local_ops = {
3039         .reserve_xprt           = xprt_reserve_xprt,
3040         .release_xprt           = xprt_release_xprt,
3041         .alloc_slot             = xprt_alloc_slot,
3042         .free_slot              = xprt_free_slot,
3043         .rpcbind                = xs_local_rpcbind,
3044         .set_port               = xs_local_set_port,
3045         .connect                = xs_local_connect,
3046         .buf_alloc              = rpc_malloc,
3047         .buf_free               = rpc_free,
3048         .prepare_request        = xs_stream_prepare_request,
3049         .send_request           = xs_local_send_request,
3050         .abort_send_request     = xs_stream_abort_send_request,
3051         .wait_for_reply_request = xprt_wait_for_reply_request_def,
3052         .close                  = xs_close,
3053         .destroy                = xs_destroy,
3054         .print_stats            = xs_local_print_stats,
3055         .enable_swap            = xs_enable_swap,
3056         .disable_swap           = xs_disable_swap,
3057 };
3058
3059 static const struct rpc_xprt_ops xs_udp_ops = {
3060         .set_buffer_size        = xs_udp_set_buffer_size,
3061         .reserve_xprt           = xprt_reserve_xprt_cong,
3062         .release_xprt           = xprt_release_xprt_cong,
3063         .alloc_slot             = xprt_alloc_slot,
3064         .free_slot              = xprt_free_slot,
3065         .rpcbind                = rpcb_getport_async,
3066         .set_port               = xs_set_port,
3067         .connect                = xs_connect,
3068         .get_srcaddr            = xs_sock_srcaddr,
3069         .get_srcport            = xs_sock_srcport,
3070         .buf_alloc              = rpc_malloc,
3071         .buf_free               = rpc_free,
3072         .send_request           = xs_udp_send_request,
3073         .wait_for_reply_request = xprt_wait_for_reply_request_rtt,
3074         .timer                  = xs_udp_timer,
3075         .release_request        = xprt_release_rqst_cong,
3076         .close                  = xs_close,
3077         .destroy                = xs_destroy,
3078         .print_stats            = xs_udp_print_stats,
3079         .enable_swap            = xs_enable_swap,
3080         .disable_swap           = xs_disable_swap,
3081         .inject_disconnect      = xs_inject_disconnect,
3082 };
3083
3084 static const struct rpc_xprt_ops xs_tcp_ops = {
3085         .reserve_xprt           = xprt_reserve_xprt,
3086         .release_xprt           = xprt_release_xprt,
3087         .alloc_slot             = xprt_alloc_slot,
3088         .free_slot              = xprt_free_slot,
3089         .rpcbind                = rpcb_getport_async,
3090         .set_port               = xs_set_port,
3091         .connect                = xs_connect,
3092         .get_srcaddr            = xs_sock_srcaddr,
3093         .get_srcport            = xs_sock_srcport,
3094         .buf_alloc              = rpc_malloc,
3095         .buf_free               = rpc_free,
3096         .prepare_request        = xs_stream_prepare_request,
3097         .send_request           = xs_tcp_send_request,
3098         .abort_send_request     = xs_stream_abort_send_request,
3099         .wait_for_reply_request = xprt_wait_for_reply_request_def,
3100         .close                  = xs_tcp_shutdown,
3101         .destroy                = xs_destroy,
3102         .set_connect_timeout    = xs_tcp_set_connect_timeout,
3103         .print_stats            = xs_tcp_print_stats,
3104         .enable_swap            = xs_enable_swap,
3105         .disable_swap           = xs_disable_swap,
3106         .inject_disconnect      = xs_inject_disconnect,
3107 #ifdef CONFIG_SUNRPC_BACKCHANNEL
3108         .bc_setup               = xprt_setup_bc,
3109         .bc_maxpayload          = xs_tcp_bc_maxpayload,
3110         .bc_num_slots           = xprt_bc_max_slots,
3111         .bc_free_rqst           = xprt_free_bc_rqst,
3112         .bc_destroy             = xprt_destroy_bc,
3113 #endif
3114 };
3115
3116 /*
3117  * The rpc_xprt_ops for the server backchannel
3118  */
3119
3120 static const struct rpc_xprt_ops bc_tcp_ops = {
3121         .reserve_xprt           = xprt_reserve_xprt,
3122         .release_xprt           = xprt_release_xprt,
3123         .alloc_slot             = xprt_alloc_slot,
3124         .free_slot              = xprt_free_slot,
3125         .buf_alloc              = bc_malloc,
3126         .buf_free               = bc_free,
3127         .send_request           = bc_send_request,
3128         .wait_for_reply_request = xprt_wait_for_reply_request_def,
3129         .close                  = bc_close,
3130         .destroy                = bc_destroy,
3131         .print_stats            = xs_tcp_print_stats,
3132         .enable_swap            = xs_enable_swap,
3133         .disable_swap           = xs_disable_swap,
3134         .inject_disconnect      = xs_inject_disconnect,
3135 };
3136
3137 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
3138 {
3139         static const struct sockaddr_in sin = {
3140                 .sin_family             = AF_INET,
3141                 .sin_addr.s_addr        = htonl(INADDR_ANY),
3142         };
3143         static const struct sockaddr_in6 sin6 = {
3144                 .sin6_family            = AF_INET6,
3145                 .sin6_addr              = IN6ADDR_ANY_INIT,
3146         };
3147
3148         switch (family) {
3149         case AF_LOCAL:
3150                 break;
3151         case AF_INET:
3152                 memcpy(sap, &sin, sizeof(sin));
3153                 break;
3154         case AF_INET6:
3155                 memcpy(sap, &sin6, sizeof(sin6));
3156                 break;
3157         default:
3158                 dprintk("RPC:       %s: Bad address family\n", __func__);
3159                 return -EAFNOSUPPORT;
3160         }
3161         return 0;
3162 }
3163
3164 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
3165                                       unsigned int slot_table_size,
3166                                       unsigned int max_slot_table_size)
3167 {
3168         struct rpc_xprt *xprt;
3169         struct sock_xprt *new;
3170
3171         if (args->addrlen > sizeof(xprt->addr)) {
3172                 dprintk("RPC:       xs_setup_xprt: address too large\n");
3173                 return ERR_PTR(-EBADF);
3174         }
3175
3176         xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
3177                         max_slot_table_size);
3178         if (xprt == NULL) {
3179                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
3180                                 "rpc_xprt\n");
3181                 return ERR_PTR(-ENOMEM);
3182         }
3183
3184         new = container_of(xprt, struct sock_xprt, xprt);
3185         mutex_init(&new->recv_mutex);
3186         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
3187         xprt->addrlen = args->addrlen;
3188         if (args->srcaddr)
3189                 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
3190         else {
3191                 int err;
3192                 err = xs_init_anyaddr(args->dstaddr->sa_family,
3193                                         (struct sockaddr *)&new->srcaddr);
3194                 if (err != 0) {
3195                         xprt_free(xprt);
3196                         return ERR_PTR(err);
3197                 }
3198         }
3199
3200         return xprt;
3201 }
3202
3203 static const struct rpc_timeout xs_local_default_timeout = {
3204         .to_initval = 10 * HZ,
3205         .to_maxval = 10 * HZ,
3206         .to_retries = 2,
3207 };
3208
3209 /**
3210  * xs_setup_local - Set up transport to use an AF_LOCAL socket
3211  * @args: rpc transport creation arguments
3212  *
3213  * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
3214  */
3215 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
3216 {
3217         struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
3218         struct sock_xprt *transport;
3219         struct rpc_xprt *xprt;
3220         struct rpc_xprt *ret;
3221
3222         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3223                         xprt_max_tcp_slot_table_entries);
3224         if (IS_ERR(xprt))
3225                 return xprt;
3226         transport = container_of(xprt, struct sock_xprt, xprt);
3227
3228         xprt->prot = 0;
3229         xprt->xprt_class = &xs_local_transport;
3230         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3231
3232         xprt->bind_timeout = XS_BIND_TO;
3233         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3234         xprt->idle_timeout = XS_IDLE_DISC_TO;
3235
3236         xprt->ops = &xs_local_ops;
3237         xprt->timeout = &xs_local_default_timeout;
3238
3239         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3240         INIT_WORK(&transport->error_worker, xs_error_handle);
3241         INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket);
3242
3243         switch (sun->sun_family) {
3244         case AF_LOCAL:
3245                 if (sun->sun_path[0] != '/' && sun->sun_path[0] != '\0') {
3246                         dprintk("RPC:       bad AF_LOCAL address: %s\n",
3247                                         sun->sun_path);
3248                         ret = ERR_PTR(-EINVAL);
3249                         goto out_err;
3250                 }
3251                 xprt_set_bound(xprt);
3252                 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
3253                 break;
3254         default:
3255                 ret = ERR_PTR(-EAFNOSUPPORT);
3256                 goto out_err;
3257         }
3258
3259         dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
3260                         xprt->address_strings[RPC_DISPLAY_ADDR]);
3261
3262         if (try_module_get(THIS_MODULE))
3263                 return xprt;
3264         ret = ERR_PTR(-EINVAL);
3265 out_err:
3266         xs_xprt_free(xprt);
3267         return ret;
3268 }
3269
3270 static const struct rpc_timeout xs_udp_default_timeout = {
3271         .to_initval = 5 * HZ,
3272         .to_maxval = 30 * HZ,
3273         .to_increment = 5 * HZ,
3274         .to_retries = 5,
3275 };
3276
3277 /**
3278  * xs_setup_udp - Set up transport to use a UDP socket
3279  * @args: rpc transport creation arguments
3280  *
3281  */
3282 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
3283 {
3284         struct sockaddr *addr = args->dstaddr;
3285         struct rpc_xprt *xprt;
3286         struct sock_xprt *transport;
3287         struct rpc_xprt *ret;
3288
3289         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
3290                         xprt_udp_slot_table_entries);
3291         if (IS_ERR(xprt))
3292                 return xprt;
3293         transport = container_of(xprt, struct sock_xprt, xprt);
3294
3295         xprt->prot = IPPROTO_UDP;
3296         xprt->xprt_class = &xs_udp_transport;
3297         /* XXX: header size can vary due to auth type, IPv6, etc. */
3298         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
3299
3300         xprt->bind_timeout = XS_BIND_TO;
3301         xprt->reestablish_timeout = XS_UDP_REEST_TO;
3302         xprt->idle_timeout = XS_IDLE_DISC_TO;
3303
3304         xprt->ops = &xs_udp_ops;
3305
3306         xprt->timeout = &xs_udp_default_timeout;
3307
3308         INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
3309         INIT_WORK(&transport->error_worker, xs_error_handle);
3310         INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
3311
3312         switch (addr->sa_family) {
3313         case AF_INET:
3314                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3315                         xprt_set_bound(xprt);
3316
3317                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
3318                 break;
3319         case AF_INET6:
3320                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3321                         xprt_set_bound(xprt);
3322
3323                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
3324                 break;
3325         default:
3326                 ret = ERR_PTR(-EAFNOSUPPORT);
3327                 goto out_err;
3328         }
3329
3330         if (xprt_bound(xprt))
3331                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3332                                 xprt->address_strings[RPC_DISPLAY_ADDR],
3333                                 xprt->address_strings[RPC_DISPLAY_PORT],
3334                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
3335         else
3336                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
3337                                 xprt->address_strings[RPC_DISPLAY_ADDR],
3338                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
3339
3340         if (try_module_get(THIS_MODULE))
3341                 return xprt;
3342         ret = ERR_PTR(-EINVAL);
3343 out_err:
3344         xs_xprt_free(xprt);
3345         return ret;
3346 }
3347
3348 static const struct rpc_timeout xs_tcp_default_timeout = {
3349         .to_initval = 60 * HZ,
3350         .to_maxval = 60 * HZ,
3351         .to_retries = 2,
3352 };
3353
3354 /**
3355  * xs_setup_tcp - Set up transport to use a TCP socket
3356  * @args: rpc transport creation arguments
3357  *
3358  */
3359 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
3360 {
3361         struct sockaddr *addr = args->dstaddr;
3362         struct rpc_xprt *xprt;
3363         struct sock_xprt *transport;
3364         struct rpc_xprt *ret;
3365         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3366
3367         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3368                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3369
3370         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3371                         max_slot_table_size);
3372         if (IS_ERR(xprt))
3373                 return xprt;
3374         transport = container_of(xprt, struct sock_xprt, xprt);
3375
3376         xprt->prot = IPPROTO_TCP;
3377         xprt->xprt_class = &xs_tcp_transport;
3378         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3379
3380         xprt->bind_timeout = XS_BIND_TO;
3381         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3382         xprt->idle_timeout = XS_IDLE_DISC_TO;
3383
3384         xprt->ops = &xs_tcp_ops;
3385         xprt->timeout = &xs_tcp_default_timeout;
3386
3387         xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3388         if (args->reconnect_timeout)
3389                 xprt->max_reconnect_timeout = args->reconnect_timeout;
3390
3391         xprt->connect_timeout = xprt->timeout->to_initval *
3392                 (xprt->timeout->to_retries + 1);
3393         if (args->connect_timeout)
3394                 xs_tcp_do_set_connect_timeout(xprt, args->connect_timeout);
3395
3396         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3397         INIT_WORK(&transport->error_worker, xs_error_handle);
3398         INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3399
3400         switch (addr->sa_family) {
3401         case AF_INET:
3402                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3403                         xprt_set_bound(xprt);
3404
3405                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3406                 break;
3407         case AF_INET6:
3408                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3409                         xprt_set_bound(xprt);
3410
3411                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3412                 break;
3413         default:
3414                 ret = ERR_PTR(-EAFNOSUPPORT);
3415                 goto out_err;
3416         }
3417
3418         if (xprt_bound(xprt))
3419                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3420                                 xprt->address_strings[RPC_DISPLAY_ADDR],
3421                                 xprt->address_strings[RPC_DISPLAY_PORT],
3422                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
3423         else
3424                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
3425                                 xprt->address_strings[RPC_DISPLAY_ADDR],
3426                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
3427
3428         if (try_module_get(THIS_MODULE))
3429                 return xprt;
3430         ret = ERR_PTR(-EINVAL);
3431 out_err:
3432         xs_xprt_free(xprt);
3433         return ret;
3434 }
3435
3436 /**
3437  * xs_setup_tcp_tls - Set up transport to use a TCP with TLS
3438  * @args: rpc transport creation arguments
3439  *
3440  */
3441 static struct rpc_xprt *xs_setup_tcp_tls(struct xprt_create *args)
3442 {
3443         struct sockaddr *addr = args->dstaddr;
3444         struct rpc_xprt *xprt;
3445         struct sock_xprt *transport;
3446         struct rpc_xprt *ret;
3447         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
3448
3449         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
3450                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
3451
3452         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3453                              max_slot_table_size);
3454         if (IS_ERR(xprt))
3455                 return xprt;
3456         transport = container_of(xprt, struct sock_xprt, xprt);
3457
3458         xprt->prot = IPPROTO_TCP;
3459         xprt->xprt_class = &xs_tcp_transport;
3460         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3461
3462         xprt->bind_timeout = XS_BIND_TO;
3463         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
3464         xprt->idle_timeout = XS_IDLE_DISC_TO;
3465
3466         xprt->ops = &xs_tcp_ops;
3467         xprt->timeout = &xs_tcp_default_timeout;
3468
3469         xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
3470         xprt->connect_timeout = xprt->timeout->to_initval *
3471                 (xprt->timeout->to_retries + 1);
3472
3473         INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn);
3474         INIT_WORK(&transport->error_worker, xs_error_handle);
3475
3476         switch (args->xprtsec.policy) {
3477         case RPC_XPRTSEC_TLS_ANON:
3478         case RPC_XPRTSEC_TLS_X509:
3479                 xprt->xprtsec = args->xprtsec;
3480                 INIT_DELAYED_WORK(&transport->connect_worker,
3481                                   xs_tcp_tls_setup_socket);
3482                 break;
3483         default:
3484                 ret = ERR_PTR(-EACCES);
3485                 goto out_err;
3486         }
3487
3488         switch (addr->sa_family) {
3489         case AF_INET:
3490                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3491                         xprt_set_bound(xprt);
3492
3493                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3494                 break;
3495         case AF_INET6:
3496                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3497                         xprt_set_bound(xprt);
3498
3499                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3500                 break;
3501         default:
3502                 ret = ERR_PTR(-EAFNOSUPPORT);
3503                 goto out_err;
3504         }
3505
3506         if (xprt_bound(xprt))
3507                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3508                         xprt->address_strings[RPC_DISPLAY_ADDR],
3509                         xprt->address_strings[RPC_DISPLAY_PORT],
3510                         xprt->address_strings[RPC_DISPLAY_PROTO]);
3511         else
3512                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
3513                         xprt->address_strings[RPC_DISPLAY_ADDR],
3514                         xprt->address_strings[RPC_DISPLAY_PROTO]);
3515
3516         if (try_module_get(THIS_MODULE))
3517                 return xprt;
3518         ret = ERR_PTR(-EINVAL);
3519 out_err:
3520         xs_xprt_free(xprt);
3521         return ret;
3522 }
3523
3524 /**
3525  * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3526  * @args: rpc transport creation arguments
3527  *
3528  */
3529 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3530 {
3531         struct sockaddr *addr = args->dstaddr;
3532         struct rpc_xprt *xprt;
3533         struct sock_xprt *transport;
3534         struct svc_sock *bc_sock;
3535         struct rpc_xprt *ret;
3536
3537         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3538                         xprt_tcp_slot_table_entries);
3539         if (IS_ERR(xprt))
3540                 return xprt;
3541         transport = container_of(xprt, struct sock_xprt, xprt);
3542
3543         xprt->prot = IPPROTO_TCP;
3544         xprt->xprt_class = &xs_bc_tcp_transport;
3545         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3546         xprt->timeout = &xs_tcp_default_timeout;
3547
3548         /* backchannel */
3549         xprt_set_bound(xprt);
3550         xprt->bind_timeout = 0;
3551         xprt->reestablish_timeout = 0;
3552         xprt->idle_timeout = 0;
3553
3554         xprt->ops = &bc_tcp_ops;
3555
3556         switch (addr->sa_family) {
3557         case AF_INET:
3558                 xs_format_peer_addresses(xprt, "tcp",
3559                                          RPCBIND_NETID_TCP);
3560                 break;
3561         case AF_INET6:
3562                 xs_format_peer_addresses(xprt, "tcp",
3563                                    RPCBIND_NETID_TCP6);
3564                 break;
3565         default:
3566                 ret = ERR_PTR(-EAFNOSUPPORT);
3567                 goto out_err;
3568         }
3569
3570         dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3571                         xprt->address_strings[RPC_DISPLAY_ADDR],
3572                         xprt->address_strings[RPC_DISPLAY_PORT],
3573                         xprt->address_strings[RPC_DISPLAY_PROTO]);
3574
3575         /*
3576          * Once we've associated a backchannel xprt with a connection,
3577          * we want to keep it around as long as the connection lasts,
3578          * in case we need to start using it for a backchannel again;
3579          * this reference won't be dropped until bc_xprt is destroyed.
3580          */
3581         xprt_get(xprt);
3582         args->bc_xprt->xpt_bc_xprt = xprt;
3583         xprt->bc_xprt = args->bc_xprt;
3584         bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3585         transport->sock = bc_sock->sk_sock;
3586         transport->inet = bc_sock->sk_sk;
3587
3588         /*
3589          * Since we don't want connections for the backchannel, we set
3590          * the xprt status to connected
3591          */
3592         xprt_set_connected(xprt);
3593
3594         if (try_module_get(THIS_MODULE))
3595                 return xprt;
3596
3597         args->bc_xprt->xpt_bc_xprt = NULL;
3598         args->bc_xprt->xpt_bc_xps = NULL;
3599         xprt_put(xprt);
3600         ret = ERR_PTR(-EINVAL);
3601 out_err:
3602         xs_xprt_free(xprt);
3603         return ret;
3604 }
3605
3606 static struct xprt_class        xs_local_transport = {
3607         .list           = LIST_HEAD_INIT(xs_local_transport.list),
3608         .name           = "named UNIX socket",
3609         .owner          = THIS_MODULE,
3610         .ident          = XPRT_TRANSPORT_LOCAL,
3611         .setup          = xs_setup_local,
3612         .netid          = { "" },
3613 };
3614
3615 static struct xprt_class        xs_udp_transport = {
3616         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
3617         .name           = "udp",
3618         .owner          = THIS_MODULE,
3619         .ident          = XPRT_TRANSPORT_UDP,
3620         .setup          = xs_setup_udp,
3621         .netid          = { "udp", "udp6", "" },
3622 };
3623
3624 static struct xprt_class        xs_tcp_transport = {
3625         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
3626         .name           = "tcp",
3627         .owner          = THIS_MODULE,
3628         .ident          = XPRT_TRANSPORT_TCP,
3629         .setup          = xs_setup_tcp,
3630         .netid          = { "tcp", "tcp6", "" },
3631 };
3632
3633 static struct xprt_class        xs_tcp_tls_transport = {
3634         .list           = LIST_HEAD_INIT(xs_tcp_tls_transport.list),
3635         .name           = "tcp-with-tls",
3636         .owner          = THIS_MODULE,
3637         .ident          = XPRT_TRANSPORT_TCP_TLS,
3638         .setup          = xs_setup_tcp_tls,
3639         .netid          = { "tcp", "tcp6", "" },
3640 };
3641
3642 static struct xprt_class        xs_bc_tcp_transport = {
3643         .list           = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3644         .name           = "tcp NFSv4.1 backchannel",
3645         .owner          = THIS_MODULE,
3646         .ident          = XPRT_TRANSPORT_BC_TCP,
3647         .setup          = xs_setup_bc_tcp,
3648         .netid          = { "" },
3649 };
3650
3651 /**
3652  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3653  *
3654  */
3655 int init_socket_xprt(void)
3656 {
3657         if (!sunrpc_table_header)
3658                 sunrpc_table_header = register_sysctl("sunrpc", xs_tunables_table);
3659
3660         xprt_register_transport(&xs_local_transport);
3661         xprt_register_transport(&xs_udp_transport);
3662         xprt_register_transport(&xs_tcp_transport);
3663         xprt_register_transport(&xs_tcp_tls_transport);
3664         xprt_register_transport(&xs_bc_tcp_transport);
3665
3666         return 0;
3667 }
3668
3669 /**
3670  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3671  *
3672  */
3673 void cleanup_socket_xprt(void)
3674 {
3675         if (sunrpc_table_header) {
3676                 unregister_sysctl_table(sunrpc_table_header);
3677                 sunrpc_table_header = NULL;
3678         }
3679
3680         xprt_unregister_transport(&xs_local_transport);
3681         xprt_unregister_transport(&xs_udp_transport);
3682         xprt_unregister_transport(&xs_tcp_transport);
3683         xprt_unregister_transport(&xs_tcp_tls_transport);
3684         xprt_unregister_transport(&xs_bc_tcp_transport);
3685 }
3686
3687 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3688 {
3689         return param_set_uint_minmax(val, kp,
3690                         RPC_MIN_RESVPORT,
3691                         RPC_MAX_RESVPORT);
3692 }
3693
3694 static const struct kernel_param_ops param_ops_portnr = {
3695         .set = param_set_portnr,
3696         .get = param_get_uint,
3697 };
3698
3699 #define param_check_portnr(name, p) \
3700         __param_check(name, p, unsigned int);
3701
3702 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3703 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3704
3705 static int param_set_slot_table_size(const char *val,
3706                                      const struct kernel_param *kp)
3707 {
3708         return param_set_uint_minmax(val, kp,
3709                         RPC_MIN_SLOT_TABLE,
3710                         RPC_MAX_SLOT_TABLE);
3711 }
3712
3713 static const struct kernel_param_ops param_ops_slot_table_size = {
3714         .set = param_set_slot_table_size,
3715         .get = param_get_uint,
3716 };
3717
3718 #define param_check_slot_table_size(name, p) \
3719         __param_check(name, p, unsigned int);
3720
3721 static int param_set_max_slot_table_size(const char *val,
3722                                      const struct kernel_param *kp)
3723 {
3724         return param_set_uint_minmax(val, kp,
3725                         RPC_MIN_SLOT_TABLE,
3726                         RPC_MAX_SLOT_TABLE_LIMIT);
3727 }
3728
3729 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3730         .set = param_set_max_slot_table_size,
3731         .get = param_get_uint,
3732 };
3733
3734 #define param_check_max_slot_table_size(name, p) \
3735         __param_check(name, p, unsigned int);
3736
3737 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3738                    slot_table_size, 0644);
3739 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3740                    max_slot_table_size, 0644);
3741 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3742                    slot_table_size, 0644);