1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/net/sunrpc/xprtsock.c 4 * 5 * Client-side transport implementation for sockets. 6 * 7 * TCP callback races fixes (C) 1998 Red Hat 8 * TCP send fixes (C) 1998 Red Hat 9 * TCP NFS related read + write fixes 10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 11 * 12 * Rewrite of larges part of the code in order to stabilize TCP stuff. 13 * Fix behaviour when socket buffer is full. 14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 15 * 16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 17 * 18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 19 * <gilles.quillard@bull.net> 20 */ 21 22 #include <linux/types.h> 23 #include <linux/string.h> 24 #include <linux/slab.h> 25 #include <linux/module.h> 26 #include <linux/capability.h> 27 #include <linux/pagemap.h> 28 #include <linux/errno.h> 29 #include <linux/socket.h> 30 #include <linux/in.h> 31 #include <linux/net.h> 32 #include <linux/mm.h> 33 #include <linux/un.h> 34 #include <linux/udp.h> 35 #include <linux/tcp.h> 36 #include <linux/sunrpc/clnt.h> 37 #include <linux/sunrpc/addr.h> 38 #include <linux/sunrpc/sched.h> 39 #include <linux/sunrpc/svcsock.h> 40 #include <linux/sunrpc/xprtsock.h> 41 #include <linux/file.h> 42 #ifdef CONFIG_SUNRPC_BACKCHANNEL 43 #include <linux/sunrpc/bc_xprt.h> 44 #endif 45 46 #include <net/sock.h> 47 #include <net/checksum.h> 48 #include <net/udp.h> 49 #include <net/tcp.h> 50 #include <linux/bvec.h> 51 #include <linux/highmem.h> 52 #include <linux/uio.h> 53 #include <linux/sched/mm.h> 54 55 #include <trace/events/sunrpc.h> 56 57 #include "socklib.h" 58 #include "sunrpc.h" 59 60 static void xs_close(struct rpc_xprt *xprt); 61 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock); 62 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 63 struct socket *sock); 64 65 /* 66 * xprtsock tunables 67 */ 68 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 69 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 70 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 71 72 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 73 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 74 75 #define XS_TCP_LINGER_TO (15U * HZ) 76 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 77 78 /* 79 * We can register our own files under /proc/sys/sunrpc by 80 * calling register_sysctl_table() again. The files in that 81 * directory become the union of all files registered there. 82 * 83 * We simply need to make sure that we don't collide with 84 * someone else's file names! 85 */ 86 87 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 88 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 89 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 90 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 91 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 92 93 static struct ctl_table_header *sunrpc_table_header; 94 95 static struct xprt_class xs_local_transport; 96 static struct xprt_class xs_udp_transport; 97 static struct xprt_class xs_tcp_transport; 98 static struct xprt_class xs_bc_tcp_transport; 99 100 /* 101 * FIXME: changing the UDP slot table size should also resize the UDP 102 * socket buffers for existing UDP transports 103 */ 104 static struct ctl_table xs_tunables_table[] = { 105 { 106 .procname = "udp_slot_table_entries", 107 .data = &xprt_udp_slot_table_entries, 108 .maxlen = sizeof(unsigned int), 109 .mode = 0644, 110 .proc_handler = proc_dointvec_minmax, 111 .extra1 = &min_slot_table_size, 112 .extra2 = &max_slot_table_size 113 }, 114 { 115 .procname = "tcp_slot_table_entries", 116 .data = &xprt_tcp_slot_table_entries, 117 .maxlen = sizeof(unsigned int), 118 .mode = 0644, 119 .proc_handler = proc_dointvec_minmax, 120 .extra1 = &min_slot_table_size, 121 .extra2 = &max_slot_table_size 122 }, 123 { 124 .procname = "tcp_max_slot_table_entries", 125 .data = &xprt_max_tcp_slot_table_entries, 126 .maxlen = sizeof(unsigned int), 127 .mode = 0644, 128 .proc_handler = proc_dointvec_minmax, 129 .extra1 = &min_slot_table_size, 130 .extra2 = &max_tcp_slot_table_limit 131 }, 132 { 133 .procname = "min_resvport", 134 .data = &xprt_min_resvport, 135 .maxlen = sizeof(unsigned int), 136 .mode = 0644, 137 .proc_handler = proc_dointvec_minmax, 138 .extra1 = &xprt_min_resvport_limit, 139 .extra2 = &xprt_max_resvport_limit 140 }, 141 { 142 .procname = "max_resvport", 143 .data = &xprt_max_resvport, 144 .maxlen = sizeof(unsigned int), 145 .mode = 0644, 146 .proc_handler = proc_dointvec_minmax, 147 .extra1 = &xprt_min_resvport_limit, 148 .extra2 = &xprt_max_resvport_limit 149 }, 150 { 151 .procname = "tcp_fin_timeout", 152 .data = &xs_tcp_fin_timeout, 153 .maxlen = sizeof(xs_tcp_fin_timeout), 154 .mode = 0644, 155 .proc_handler = proc_dointvec_jiffies, 156 }, 157 { }, 158 }; 159 160 static struct ctl_table sunrpc_table[] = { 161 { 162 .procname = "sunrpc", 163 .mode = 0555, 164 .child = xs_tunables_table 165 }, 166 { }, 167 }; 168 169 /* 170 * Wait duration for a reply from the RPC portmapper. 171 */ 172 #define XS_BIND_TO (60U * HZ) 173 174 /* 175 * Delay if a UDP socket connect error occurs. This is most likely some 176 * kind of resource problem on the local host. 177 */ 178 #define XS_UDP_REEST_TO (2U * HZ) 179 180 /* 181 * The reestablish timeout allows clients to delay for a bit before attempting 182 * to reconnect to a server that just dropped our connection. 183 * 184 * We implement an exponential backoff when trying to reestablish a TCP 185 * transport connection with the server. Some servers like to drop a TCP 186 * connection when they are overworked, so we start with a short timeout and 187 * increase over time if the server is down or not responding. 188 */ 189 #define XS_TCP_INIT_REEST_TO (3U * HZ) 190 191 /* 192 * TCP idle timeout; client drops the transport socket if it is idle 193 * for this long. Note that we also timeout UDP sockets to prevent 194 * holding port numbers when there is no RPC traffic. 195 */ 196 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 197 198 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 199 # undef RPC_DEBUG_DATA 200 # define RPCDBG_FACILITY RPCDBG_TRANS 201 #endif 202 203 #ifdef RPC_DEBUG_DATA 204 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 205 { 206 u8 *buf = (u8 *) packet; 207 int j; 208 209 dprintk("RPC: %s\n", msg); 210 for (j = 0; j < count && j < 128; j += 4) { 211 if (!(j & 31)) { 212 if (j) 213 dprintk("\n"); 214 dprintk("0x%04x ", j); 215 } 216 dprintk("%02x%02x%02x%02x ", 217 buf[j], buf[j+1], buf[j+2], buf[j+3]); 218 } 219 dprintk("\n"); 220 } 221 #else 222 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 223 { 224 /* NOP */ 225 } 226 #endif 227 228 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 229 { 230 return (struct rpc_xprt *) sk->sk_user_data; 231 } 232 233 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 234 { 235 return (struct sockaddr *) &xprt->addr; 236 } 237 238 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 239 { 240 return (struct sockaddr_un *) &xprt->addr; 241 } 242 243 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 244 { 245 return (struct sockaddr_in *) &xprt->addr; 246 } 247 248 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 249 { 250 return (struct sockaddr_in6 *) &xprt->addr; 251 } 252 253 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 254 { 255 struct sockaddr *sap = xs_addr(xprt); 256 struct sockaddr_in6 *sin6; 257 struct sockaddr_in *sin; 258 struct sockaddr_un *sun; 259 char buf[128]; 260 261 switch (sap->sa_family) { 262 case AF_LOCAL: 263 sun = xs_addr_un(xprt); 264 strscpy(buf, sun->sun_path, sizeof(buf)); 265 xprt->address_strings[RPC_DISPLAY_ADDR] = 266 kstrdup(buf, GFP_KERNEL); 267 break; 268 case AF_INET: 269 (void)rpc_ntop(sap, buf, sizeof(buf)); 270 xprt->address_strings[RPC_DISPLAY_ADDR] = 271 kstrdup(buf, GFP_KERNEL); 272 sin = xs_addr_in(xprt); 273 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 274 break; 275 case AF_INET6: 276 (void)rpc_ntop(sap, buf, sizeof(buf)); 277 xprt->address_strings[RPC_DISPLAY_ADDR] = 278 kstrdup(buf, GFP_KERNEL); 279 sin6 = xs_addr_in6(xprt); 280 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 281 break; 282 default: 283 BUG(); 284 } 285 286 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 287 } 288 289 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 290 { 291 struct sockaddr *sap = xs_addr(xprt); 292 char buf[128]; 293 294 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 295 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 296 297 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 298 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 299 } 300 301 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 302 const char *protocol, 303 const char *netid) 304 { 305 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 306 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 307 xs_format_common_peer_addresses(xprt); 308 xs_format_common_peer_ports(xprt); 309 } 310 311 static void xs_update_peer_port(struct rpc_xprt *xprt) 312 { 313 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 314 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 315 316 xs_format_common_peer_ports(xprt); 317 } 318 319 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 320 { 321 unsigned int i; 322 323 for (i = 0; i < RPC_DISPLAY_MAX; i++) 324 switch (i) { 325 case RPC_DISPLAY_PROTO: 326 case RPC_DISPLAY_NETID: 327 continue; 328 default: 329 kfree(xprt->address_strings[i]); 330 } 331 } 332 333 static size_t 334 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) 335 { 336 size_t i,n; 337 338 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) 339 return want; 340 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; 341 for (i = 0; i < n; i++) { 342 if (buf->pages[i]) 343 continue; 344 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); 345 if (!buf->pages[i]) { 346 i *= PAGE_SIZE; 347 return i > buf->page_base ? i - buf->page_base : 0; 348 } 349 } 350 return want; 351 } 352 353 static ssize_t 354 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) 355 { 356 ssize_t ret; 357 if (seek != 0) 358 iov_iter_advance(&msg->msg_iter, seek); 359 ret = sock_recvmsg(sock, msg, flags); 360 return ret > 0 ? ret + seek : ret; 361 } 362 363 static ssize_t 364 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, 365 struct kvec *kvec, size_t count, size_t seek) 366 { 367 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); 368 return xs_sock_recvmsg(sock, msg, flags, seek); 369 } 370 371 static ssize_t 372 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, 373 struct bio_vec *bvec, unsigned long nr, size_t count, 374 size_t seek) 375 { 376 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); 377 return xs_sock_recvmsg(sock, msg, flags, seek); 378 } 379 380 static ssize_t 381 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, 382 size_t count) 383 { 384 iov_iter_discard(&msg->msg_iter, READ, count); 385 return sock_recvmsg(sock, msg, flags); 386 } 387 388 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 389 static void 390 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 391 { 392 struct bvec_iter bi = { 393 .bi_size = count, 394 }; 395 struct bio_vec bv; 396 397 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); 398 for_each_bvec(bv, bvec, bi, bi) 399 flush_dcache_page(bv.bv_page); 400 } 401 #else 402 static inline void 403 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 404 { 405 } 406 #endif 407 408 static ssize_t 409 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, 410 struct xdr_buf *buf, size_t count, size_t seek, size_t *read) 411 { 412 size_t want, seek_init = seek, offset = 0; 413 ssize_t ret; 414 415 want = min_t(size_t, count, buf->head[0].iov_len); 416 if (seek < want) { 417 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); 418 if (ret <= 0) 419 goto sock_err; 420 offset += ret; 421 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 422 goto out; 423 if (ret != want) 424 goto out; 425 seek = 0; 426 } else { 427 seek -= want; 428 offset += want; 429 } 430 431 want = xs_alloc_sparse_pages( 432 buf, min_t(size_t, count - offset, buf->page_len), 433 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); 434 if (seek < want) { 435 ret = xs_read_bvec(sock, msg, flags, buf->bvec, 436 xdr_buf_pagecount(buf), 437 want + buf->page_base, 438 seek + buf->page_base); 439 if (ret <= 0) 440 goto sock_err; 441 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); 442 ret -= buf->page_base; 443 offset += ret; 444 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 445 goto out; 446 if (ret != want) 447 goto out; 448 seek = 0; 449 } else { 450 seek -= want; 451 offset += want; 452 } 453 454 want = min_t(size_t, count - offset, buf->tail[0].iov_len); 455 if (seek < want) { 456 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); 457 if (ret <= 0) 458 goto sock_err; 459 offset += ret; 460 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 461 goto out; 462 if (ret != want) 463 goto out; 464 } else if (offset < seek_init) 465 offset = seek_init; 466 ret = -EMSGSIZE; 467 out: 468 *read = offset - seek_init; 469 return ret; 470 sock_err: 471 offset += seek; 472 goto out; 473 } 474 475 static void 476 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) 477 { 478 if (!transport->recv.copied) { 479 if (buf->head[0].iov_len >= transport->recv.offset) 480 memcpy(buf->head[0].iov_base, 481 &transport->recv.xid, 482 transport->recv.offset); 483 transport->recv.copied = transport->recv.offset; 484 } 485 } 486 487 static bool 488 xs_read_stream_request_done(struct sock_xprt *transport) 489 { 490 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); 491 } 492 493 static void 494 xs_read_stream_check_eor(struct sock_xprt *transport, 495 struct msghdr *msg) 496 { 497 if (xs_read_stream_request_done(transport)) 498 msg->msg_flags |= MSG_EOR; 499 } 500 501 static ssize_t 502 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, 503 int flags, struct rpc_rqst *req) 504 { 505 struct xdr_buf *buf = &req->rq_private_buf; 506 size_t want, read; 507 ssize_t ret; 508 509 xs_read_header(transport, buf); 510 511 want = transport->recv.len - transport->recv.offset; 512 if (want != 0) { 513 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, 514 transport->recv.copied + want, 515 transport->recv.copied, 516 &read); 517 transport->recv.offset += read; 518 transport->recv.copied += read; 519 } 520 521 if (transport->recv.offset == transport->recv.len) 522 xs_read_stream_check_eor(transport, msg); 523 524 if (want == 0) 525 return 0; 526 527 switch (ret) { 528 default: 529 break; 530 case -EFAULT: 531 case -EMSGSIZE: 532 msg->msg_flags |= MSG_TRUNC; 533 return read; 534 case 0: 535 return -ESHUTDOWN; 536 } 537 return ret < 0 ? ret : read; 538 } 539 540 static size_t 541 xs_read_stream_headersize(bool isfrag) 542 { 543 if (isfrag) 544 return sizeof(__be32); 545 return 3 * sizeof(__be32); 546 } 547 548 static ssize_t 549 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, 550 int flags, size_t want, size_t seek) 551 { 552 struct kvec kvec = { 553 .iov_base = &transport->recv.fraghdr, 554 .iov_len = want, 555 }; 556 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); 557 } 558 559 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 560 static ssize_t 561 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 562 { 563 struct rpc_xprt *xprt = &transport->xprt; 564 struct rpc_rqst *req; 565 ssize_t ret; 566 567 /* Is this transport associated with the backchannel? */ 568 if (!xprt->bc_serv) 569 return -ESHUTDOWN; 570 571 /* Look up and lock the request corresponding to the given XID */ 572 req = xprt_lookup_bc_request(xprt, transport->recv.xid); 573 if (!req) { 574 printk(KERN_WARNING "Callback slot table overflowed\n"); 575 return -ESHUTDOWN; 576 } 577 if (transport->recv.copied && !req->rq_private_buf.len) 578 return -ESHUTDOWN; 579 580 ret = xs_read_stream_request(transport, msg, flags, req); 581 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 582 xprt_complete_bc_request(req, transport->recv.copied); 583 else 584 req->rq_private_buf.len = transport->recv.copied; 585 586 return ret; 587 } 588 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 589 static ssize_t 590 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 591 { 592 return -ESHUTDOWN; 593 } 594 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 595 596 static ssize_t 597 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) 598 { 599 struct rpc_xprt *xprt = &transport->xprt; 600 struct rpc_rqst *req; 601 ssize_t ret = 0; 602 603 /* Look up and lock the request corresponding to the given XID */ 604 spin_lock(&xprt->queue_lock); 605 req = xprt_lookup_rqst(xprt, transport->recv.xid); 606 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) { 607 msg->msg_flags |= MSG_TRUNC; 608 goto out; 609 } 610 xprt_pin_rqst(req); 611 spin_unlock(&xprt->queue_lock); 612 613 ret = xs_read_stream_request(transport, msg, flags, req); 614 615 spin_lock(&xprt->queue_lock); 616 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 617 xprt_complete_rqst(req->rq_task, transport->recv.copied); 618 else 619 req->rq_private_buf.len = transport->recv.copied; 620 xprt_unpin_rqst(req); 621 out: 622 spin_unlock(&xprt->queue_lock); 623 return ret; 624 } 625 626 static ssize_t 627 xs_read_stream(struct sock_xprt *transport, int flags) 628 { 629 struct msghdr msg = { 0 }; 630 size_t want, read = 0; 631 ssize_t ret = 0; 632 633 if (transport->recv.len == 0) { 634 want = xs_read_stream_headersize(transport->recv.copied != 0); 635 ret = xs_read_stream_header(transport, &msg, flags, want, 636 transport->recv.offset); 637 if (ret <= 0) 638 goto out_err; 639 transport->recv.offset = ret; 640 if (transport->recv.offset != want) 641 return transport->recv.offset; 642 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & 643 RPC_FRAGMENT_SIZE_MASK; 644 transport->recv.offset -= sizeof(transport->recv.fraghdr); 645 read = ret; 646 } 647 648 switch (be32_to_cpu(transport->recv.calldir)) { 649 default: 650 msg.msg_flags |= MSG_TRUNC; 651 break; 652 case RPC_CALL: 653 ret = xs_read_stream_call(transport, &msg, flags); 654 break; 655 case RPC_REPLY: 656 ret = xs_read_stream_reply(transport, &msg, flags); 657 } 658 if (msg.msg_flags & MSG_TRUNC) { 659 transport->recv.calldir = cpu_to_be32(-1); 660 transport->recv.copied = -1; 661 } 662 if (ret < 0) 663 goto out_err; 664 read += ret; 665 if (transport->recv.offset < transport->recv.len) { 666 if (!(msg.msg_flags & MSG_TRUNC)) 667 return read; 668 msg.msg_flags = 0; 669 ret = xs_read_discard(transport->sock, &msg, flags, 670 transport->recv.len - transport->recv.offset); 671 if (ret <= 0) 672 goto out_err; 673 transport->recv.offset += ret; 674 read += ret; 675 if (transport->recv.offset != transport->recv.len) 676 return read; 677 } 678 if (xs_read_stream_request_done(transport)) { 679 trace_xs_stream_read_request(transport); 680 transport->recv.copied = 0; 681 } 682 transport->recv.offset = 0; 683 transport->recv.len = 0; 684 return read; 685 out_err: 686 return ret != 0 ? ret : -ESHUTDOWN; 687 } 688 689 static __poll_t xs_poll_socket(struct sock_xprt *transport) 690 { 691 return transport->sock->ops->poll(transport->file, transport->sock, 692 NULL); 693 } 694 695 static bool xs_poll_socket_readable(struct sock_xprt *transport) 696 { 697 __poll_t events = xs_poll_socket(transport); 698 699 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); 700 } 701 702 static void xs_poll_check_readable(struct sock_xprt *transport) 703 { 704 705 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 706 if (!xs_poll_socket_readable(transport)) 707 return; 708 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 709 queue_work(xprtiod_workqueue, &transport->recv_worker); 710 } 711 712 static void xs_stream_data_receive(struct sock_xprt *transport) 713 { 714 size_t read = 0; 715 ssize_t ret = 0; 716 717 mutex_lock(&transport->recv_mutex); 718 if (transport->sock == NULL) 719 goto out; 720 for (;;) { 721 ret = xs_read_stream(transport, MSG_DONTWAIT); 722 if (ret < 0) 723 break; 724 read += ret; 725 cond_resched(); 726 } 727 if (ret == -ESHUTDOWN) 728 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 729 else 730 xs_poll_check_readable(transport); 731 out: 732 mutex_unlock(&transport->recv_mutex); 733 trace_xs_stream_read_data(&transport->xprt, ret, read); 734 } 735 736 static void xs_stream_data_receive_workfn(struct work_struct *work) 737 { 738 struct sock_xprt *transport = 739 container_of(work, struct sock_xprt, recv_worker); 740 unsigned int pflags = memalloc_nofs_save(); 741 742 xs_stream_data_receive(transport); 743 memalloc_nofs_restore(pflags); 744 } 745 746 static void 747 xs_stream_reset_connect(struct sock_xprt *transport) 748 { 749 transport->recv.offset = 0; 750 transport->recv.len = 0; 751 transport->recv.copied = 0; 752 transport->xmit.offset = 0; 753 } 754 755 static void 756 xs_stream_start_connect(struct sock_xprt *transport) 757 { 758 transport->xprt.stat.connect_count++; 759 transport->xprt.stat.connect_start = jiffies; 760 } 761 762 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 763 764 /** 765 * xs_nospace - handle transmit was incomplete 766 * @req: pointer to RPC request 767 * @transport: pointer to struct sock_xprt 768 * 769 */ 770 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport) 771 { 772 struct rpc_xprt *xprt = &transport->xprt; 773 struct sock *sk = transport->inet; 774 int ret = -EAGAIN; 775 776 trace_rpc_socket_nospace(req, transport); 777 778 /* Protect against races with write_space */ 779 spin_lock(&xprt->transport_lock); 780 781 /* Don't race with disconnect */ 782 if (xprt_connected(xprt)) { 783 /* wait for more buffer space */ 784 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state); 785 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 786 sk->sk_write_pending++; 787 xprt_wait_for_buffer_space(xprt); 788 } else 789 ret = -ENOTCONN; 790 791 spin_unlock(&xprt->transport_lock); 792 return ret; 793 } 794 795 static int xs_sock_nospace(struct rpc_rqst *req) 796 { 797 struct sock_xprt *transport = 798 container_of(req->rq_xprt, struct sock_xprt, xprt); 799 struct sock *sk = transport->inet; 800 int ret = -EAGAIN; 801 802 lock_sock(sk); 803 if (!sock_writeable(sk)) 804 ret = xs_nospace(req, transport); 805 release_sock(sk); 806 return ret; 807 } 808 809 static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait) 810 { 811 struct sock_xprt *transport = 812 container_of(req->rq_xprt, struct sock_xprt, xprt); 813 struct sock *sk = transport->inet; 814 int ret = -EAGAIN; 815 816 if (vm_wait) 817 return -ENOBUFS; 818 lock_sock(sk); 819 if (!sk_stream_memory_free(sk)) 820 ret = xs_nospace(req, transport); 821 release_sock(sk); 822 return ret; 823 } 824 825 static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf) 826 { 827 return xdr_alloc_bvec(buf, rpc_task_gfp_mask()); 828 } 829 830 /* 831 * Determine if the previous message in the stream was aborted before it 832 * could complete transmission. 833 */ 834 static bool 835 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) 836 { 837 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; 838 } 839 840 /* 841 * Return the stream record marker field for a record of length < 2^31-1 842 */ 843 static rpc_fraghdr 844 xs_stream_record_marker(struct xdr_buf *xdr) 845 { 846 if (!xdr->len) 847 return 0; 848 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); 849 } 850 851 /** 852 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 853 * @req: pointer to RPC request 854 * 855 * Return values: 856 * 0: The request has been sent 857 * EAGAIN: The socket was blocked, please call again later to 858 * complete the request 859 * ENOTCONN: Caller needs to invoke connect logic then call again 860 * other: Some other error occurred, the request was not sent 861 */ 862 static int xs_local_send_request(struct rpc_rqst *req) 863 { 864 struct rpc_xprt *xprt = req->rq_xprt; 865 struct sock_xprt *transport = 866 container_of(xprt, struct sock_xprt, xprt); 867 struct xdr_buf *xdr = &req->rq_snd_buf; 868 rpc_fraghdr rm = xs_stream_record_marker(xdr); 869 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 870 struct msghdr msg = { 871 .msg_flags = XS_SENDMSG_FLAGS, 872 }; 873 bool vm_wait; 874 unsigned int sent; 875 int status; 876 877 /* Close the stream if the previous transmission was incomplete */ 878 if (xs_send_request_was_aborted(transport, req)) { 879 xprt_force_disconnect(xprt); 880 return -ENOTCONN; 881 } 882 883 xs_pktdump("packet data:", 884 req->rq_svec->iov_base, req->rq_svec->iov_len); 885 886 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false; 887 888 req->rq_xtime = ktime_get(); 889 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 890 transport->xmit.offset, rm, &sent); 891 dprintk("RPC: %s(%u) = %d\n", 892 __func__, xdr->len - transport->xmit.offset, status); 893 894 if (likely(sent > 0) || status == 0) { 895 transport->xmit.offset += sent; 896 req->rq_bytes_sent = transport->xmit.offset; 897 if (likely(req->rq_bytes_sent >= msglen)) { 898 req->rq_xmit_bytes_sent += transport->xmit.offset; 899 transport->xmit.offset = 0; 900 return 0; 901 } 902 status = -EAGAIN; 903 vm_wait = false; 904 } 905 906 switch (status) { 907 case -EAGAIN: 908 status = xs_stream_nospace(req, vm_wait); 909 break; 910 default: 911 dprintk("RPC: sendmsg returned unrecognized error %d\n", 912 -status); 913 fallthrough; 914 case -EPIPE: 915 xprt_force_disconnect(xprt); 916 status = -ENOTCONN; 917 } 918 919 return status; 920 } 921 922 /** 923 * xs_udp_send_request - write an RPC request to a UDP socket 924 * @req: pointer to RPC request 925 * 926 * Return values: 927 * 0: The request has been sent 928 * EAGAIN: The socket was blocked, please call again later to 929 * complete the request 930 * ENOTCONN: Caller needs to invoke connect logic then call again 931 * other: Some other error occurred, the request was not sent 932 */ 933 static int xs_udp_send_request(struct rpc_rqst *req) 934 { 935 struct rpc_xprt *xprt = req->rq_xprt; 936 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 937 struct xdr_buf *xdr = &req->rq_snd_buf; 938 struct msghdr msg = { 939 .msg_name = xs_addr(xprt), 940 .msg_namelen = xprt->addrlen, 941 .msg_flags = XS_SENDMSG_FLAGS, 942 }; 943 unsigned int sent; 944 int status; 945 946 xs_pktdump("packet data:", 947 req->rq_svec->iov_base, 948 req->rq_svec->iov_len); 949 950 if (!xprt_bound(xprt)) 951 return -ENOTCONN; 952 953 if (!xprt_request_get_cong(xprt, req)) 954 return -EBADSLT; 955 956 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask()); 957 if (status < 0) 958 return status; 959 req->rq_xtime = ktime_get(); 960 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent); 961 962 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 963 xdr->len, status); 964 965 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 966 if (status == -EPERM) 967 goto process_status; 968 969 if (status == -EAGAIN && sock_writeable(transport->inet)) 970 status = -ENOBUFS; 971 972 if (sent > 0 || status == 0) { 973 req->rq_xmit_bytes_sent += sent; 974 if (sent >= req->rq_slen) 975 return 0; 976 /* Still some bytes left; set up for a retry later. */ 977 status = -EAGAIN; 978 } 979 980 process_status: 981 switch (status) { 982 case -ENOTSOCK: 983 status = -ENOTCONN; 984 /* Should we call xs_close() here? */ 985 break; 986 case -EAGAIN: 987 status = xs_sock_nospace(req); 988 break; 989 case -ENETUNREACH: 990 case -ENOBUFS: 991 case -EPIPE: 992 case -ECONNREFUSED: 993 case -EPERM: 994 /* When the server has died, an ICMP port unreachable message 995 * prompts ECONNREFUSED. */ 996 break; 997 default: 998 dprintk("RPC: sendmsg returned unrecognized error %d\n", 999 -status); 1000 } 1001 1002 return status; 1003 } 1004 1005 /** 1006 * xs_tcp_send_request - write an RPC request to a TCP socket 1007 * @req: pointer to RPC request 1008 * 1009 * Return values: 1010 * 0: The request has been sent 1011 * EAGAIN: The socket was blocked, please call again later to 1012 * complete the request 1013 * ENOTCONN: Caller needs to invoke connect logic then call again 1014 * other: Some other error occurred, the request was not sent 1015 * 1016 * XXX: In the case of soft timeouts, should we eventually give up 1017 * if sendmsg is not able to make progress? 1018 */ 1019 static int xs_tcp_send_request(struct rpc_rqst *req) 1020 { 1021 struct rpc_xprt *xprt = req->rq_xprt; 1022 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1023 struct xdr_buf *xdr = &req->rq_snd_buf; 1024 rpc_fraghdr rm = xs_stream_record_marker(xdr); 1025 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 1026 struct msghdr msg = { 1027 .msg_flags = XS_SENDMSG_FLAGS, 1028 }; 1029 bool vm_wait; 1030 unsigned int sent; 1031 int status; 1032 1033 /* Close the stream if the previous transmission was incomplete */ 1034 if (xs_send_request_was_aborted(transport, req)) { 1035 if (transport->sock != NULL) 1036 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 1037 return -ENOTCONN; 1038 } 1039 if (!transport->inet) 1040 return -ENOTCONN; 1041 1042 xs_pktdump("packet data:", 1043 req->rq_svec->iov_base, 1044 req->rq_svec->iov_len); 1045 1046 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 1047 xs_tcp_set_socket_timeouts(xprt, transport->sock); 1048 1049 xs_set_srcport(transport, transport->sock); 1050 1051 /* Continue transmitting the packet/record. We must be careful 1052 * to cope with writespace callbacks arriving _after_ we have 1053 * called sendmsg(). */ 1054 req->rq_xtime = ktime_get(); 1055 tcp_sock_set_cork(transport->inet, true); 1056 1057 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false; 1058 1059 do { 1060 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 1061 transport->xmit.offset, rm, &sent); 1062 1063 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 1064 xdr->len - transport->xmit.offset, status); 1065 1066 /* If we've sent the entire packet, immediately 1067 * reset the count of bytes sent. */ 1068 transport->xmit.offset += sent; 1069 req->rq_bytes_sent = transport->xmit.offset; 1070 if (likely(req->rq_bytes_sent >= msglen)) { 1071 req->rq_xmit_bytes_sent += transport->xmit.offset; 1072 transport->xmit.offset = 0; 1073 if (atomic_long_read(&xprt->xmit_queuelen) == 1) 1074 tcp_sock_set_cork(transport->inet, false); 1075 return 0; 1076 } 1077 1078 WARN_ON_ONCE(sent == 0 && status == 0); 1079 1080 if (sent > 0) 1081 vm_wait = false; 1082 1083 } while (status == 0); 1084 1085 switch (status) { 1086 case -ENOTSOCK: 1087 status = -ENOTCONN; 1088 /* Should we call xs_close() here? */ 1089 break; 1090 case -EAGAIN: 1091 status = xs_stream_nospace(req, vm_wait); 1092 break; 1093 case -ECONNRESET: 1094 case -ECONNREFUSED: 1095 case -ENOTCONN: 1096 case -EADDRINUSE: 1097 case -ENOBUFS: 1098 case -EPIPE: 1099 break; 1100 default: 1101 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1102 -status); 1103 } 1104 1105 return status; 1106 } 1107 1108 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1109 { 1110 transport->old_data_ready = sk->sk_data_ready; 1111 transport->old_state_change = sk->sk_state_change; 1112 transport->old_write_space = sk->sk_write_space; 1113 transport->old_error_report = sk->sk_error_report; 1114 } 1115 1116 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1117 { 1118 sk->sk_data_ready = transport->old_data_ready; 1119 sk->sk_state_change = transport->old_state_change; 1120 sk->sk_write_space = transport->old_write_space; 1121 sk->sk_error_report = transport->old_error_report; 1122 } 1123 1124 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 1125 { 1126 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1127 1128 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1129 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state); 1130 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state); 1131 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state); 1132 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state); 1133 } 1134 1135 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr) 1136 { 1137 set_bit(nr, &transport->sock_state); 1138 queue_work(xprtiod_workqueue, &transport->error_worker); 1139 } 1140 1141 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1142 { 1143 xprt->connect_cookie++; 1144 smp_mb__before_atomic(); 1145 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1146 clear_bit(XPRT_CLOSING, &xprt->state); 1147 xs_sock_reset_state_flags(xprt); 1148 smp_mb__after_atomic(); 1149 } 1150 1151 /** 1152 * xs_error_report - callback to handle TCP socket state errors 1153 * @sk: socket 1154 * 1155 * Note: we don't call sock_error() since there may be a rpc_task 1156 * using the socket, and so we don't want to clear sk->sk_err. 1157 */ 1158 static void xs_error_report(struct sock *sk) 1159 { 1160 struct sock_xprt *transport; 1161 struct rpc_xprt *xprt; 1162 1163 if (!(xprt = xprt_from_sock(sk))) 1164 return; 1165 1166 transport = container_of(xprt, struct sock_xprt, xprt); 1167 transport->xprt_err = -sk->sk_err; 1168 if (transport->xprt_err == 0) 1169 return; 1170 dprintk("RPC: xs_error_report client %p, error=%d...\n", 1171 xprt, -transport->xprt_err); 1172 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err); 1173 1174 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */ 1175 smp_mb__before_atomic(); 1176 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR); 1177 } 1178 1179 static void xs_reset_transport(struct sock_xprt *transport) 1180 { 1181 struct socket *sock = transport->sock; 1182 struct sock *sk = transport->inet; 1183 struct rpc_xprt *xprt = &transport->xprt; 1184 struct file *filp = transport->file; 1185 1186 if (sk == NULL) 1187 return; 1188 /* 1189 * Make sure we're calling this in a context from which it is safe 1190 * to call __fput_sync(). In practice that means rpciod and the 1191 * system workqueue. 1192 */ 1193 if (!(current->flags & PF_WQ_WORKER)) { 1194 WARN_ON_ONCE(1); 1195 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 1196 return; 1197 } 1198 1199 if (atomic_read(&transport->xprt.swapper)) 1200 sk_clear_memalloc(sk); 1201 1202 kernel_sock_shutdown(sock, SHUT_RDWR); 1203 1204 mutex_lock(&transport->recv_mutex); 1205 lock_sock(sk); 1206 transport->inet = NULL; 1207 transport->sock = NULL; 1208 transport->file = NULL; 1209 1210 sk->sk_user_data = NULL; 1211 1212 xs_restore_old_callbacks(transport, sk); 1213 xprt_clear_connected(xprt); 1214 xs_sock_reset_connection_flags(xprt); 1215 /* Reset stream record info */ 1216 xs_stream_reset_connect(transport); 1217 release_sock(sk); 1218 mutex_unlock(&transport->recv_mutex); 1219 1220 trace_rpc_socket_close(xprt, sock); 1221 __fput_sync(filp); 1222 1223 xprt_disconnect_done(xprt); 1224 } 1225 1226 /** 1227 * xs_close - close a socket 1228 * @xprt: transport 1229 * 1230 * This is used when all requests are complete; ie, no DRC state remains 1231 * on the server we want to save. 1232 * 1233 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 1234 * xs_reset_transport() zeroing the socket from underneath a writer. 1235 */ 1236 static void xs_close(struct rpc_xprt *xprt) 1237 { 1238 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1239 1240 dprintk("RPC: xs_close xprt %p\n", xprt); 1241 1242 xs_reset_transport(transport); 1243 xprt->reestablish_timeout = 0; 1244 } 1245 1246 static void xs_inject_disconnect(struct rpc_xprt *xprt) 1247 { 1248 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 1249 xprt); 1250 xprt_disconnect_done(xprt); 1251 } 1252 1253 static void xs_xprt_free(struct rpc_xprt *xprt) 1254 { 1255 xs_free_peer_addresses(xprt); 1256 xprt_free(xprt); 1257 } 1258 1259 /** 1260 * xs_destroy - prepare to shutdown a transport 1261 * @xprt: doomed transport 1262 * 1263 */ 1264 static void xs_destroy(struct rpc_xprt *xprt) 1265 { 1266 struct sock_xprt *transport = container_of(xprt, 1267 struct sock_xprt, xprt); 1268 dprintk("RPC: xs_destroy xprt %p\n", xprt); 1269 1270 cancel_delayed_work_sync(&transport->connect_worker); 1271 xs_close(xprt); 1272 cancel_work_sync(&transport->recv_worker); 1273 cancel_work_sync(&transport->error_worker); 1274 xs_xprt_free(xprt); 1275 module_put(THIS_MODULE); 1276 } 1277 1278 /** 1279 * xs_udp_data_read_skb - receive callback for UDP sockets 1280 * @xprt: transport 1281 * @sk: socket 1282 * @skb: skbuff 1283 * 1284 */ 1285 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1286 struct sock *sk, 1287 struct sk_buff *skb) 1288 { 1289 struct rpc_task *task; 1290 struct rpc_rqst *rovr; 1291 int repsize, copied; 1292 u32 _xid; 1293 __be32 *xp; 1294 1295 repsize = skb->len; 1296 if (repsize < 4) { 1297 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1298 return; 1299 } 1300 1301 /* Copy the XID from the skb... */ 1302 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1303 if (xp == NULL) 1304 return; 1305 1306 /* Look up and lock the request corresponding to the given XID */ 1307 spin_lock(&xprt->queue_lock); 1308 rovr = xprt_lookup_rqst(xprt, *xp); 1309 if (!rovr) 1310 goto out_unlock; 1311 xprt_pin_rqst(rovr); 1312 xprt_update_rtt(rovr->rq_task); 1313 spin_unlock(&xprt->queue_lock); 1314 task = rovr->rq_task; 1315 1316 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1317 copied = repsize; 1318 1319 /* Suck it into the iovec, verify checksum if not done by hw. */ 1320 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1321 spin_lock(&xprt->queue_lock); 1322 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1323 goto out_unpin; 1324 } 1325 1326 1327 spin_lock(&xprt->transport_lock); 1328 xprt_adjust_cwnd(xprt, task, copied); 1329 spin_unlock(&xprt->transport_lock); 1330 spin_lock(&xprt->queue_lock); 1331 xprt_complete_rqst(task, copied); 1332 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1333 out_unpin: 1334 xprt_unpin_rqst(rovr); 1335 out_unlock: 1336 spin_unlock(&xprt->queue_lock); 1337 } 1338 1339 static void xs_udp_data_receive(struct sock_xprt *transport) 1340 { 1341 struct sk_buff *skb; 1342 struct sock *sk; 1343 int err; 1344 1345 mutex_lock(&transport->recv_mutex); 1346 sk = transport->inet; 1347 if (sk == NULL) 1348 goto out; 1349 for (;;) { 1350 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err); 1351 if (skb == NULL) 1352 break; 1353 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1354 consume_skb(skb); 1355 cond_resched(); 1356 } 1357 xs_poll_check_readable(transport); 1358 out: 1359 mutex_unlock(&transport->recv_mutex); 1360 } 1361 1362 static void xs_udp_data_receive_workfn(struct work_struct *work) 1363 { 1364 struct sock_xprt *transport = 1365 container_of(work, struct sock_xprt, recv_worker); 1366 unsigned int pflags = memalloc_nofs_save(); 1367 1368 xs_udp_data_receive(transport); 1369 memalloc_nofs_restore(pflags); 1370 } 1371 1372 /** 1373 * xs_data_ready - "data ready" callback for sockets 1374 * @sk: socket with data to read 1375 * 1376 */ 1377 static void xs_data_ready(struct sock *sk) 1378 { 1379 struct rpc_xprt *xprt; 1380 1381 xprt = xprt_from_sock(sk); 1382 if (xprt != NULL) { 1383 struct sock_xprt *transport = container_of(xprt, 1384 struct sock_xprt, xprt); 1385 1386 trace_xs_data_ready(xprt); 1387 1388 transport->old_data_ready(sk); 1389 /* Any data means we had a useful conversation, so 1390 * then we don't need to delay the next reconnect 1391 */ 1392 if (xprt->reestablish_timeout) 1393 xprt->reestablish_timeout = 0; 1394 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1395 queue_work(xprtiod_workqueue, &transport->recv_worker); 1396 } 1397 } 1398 1399 /* 1400 * Helper function to force a TCP close if the server is sending 1401 * junk and/or it has put us in CLOSE_WAIT 1402 */ 1403 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1404 { 1405 xprt_force_disconnect(xprt); 1406 } 1407 1408 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1409 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1410 { 1411 return PAGE_SIZE; 1412 } 1413 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1414 1415 /** 1416 * xs_local_state_change - callback to handle AF_LOCAL socket state changes 1417 * @sk: socket whose state has changed 1418 * 1419 */ 1420 static void xs_local_state_change(struct sock *sk) 1421 { 1422 struct rpc_xprt *xprt; 1423 struct sock_xprt *transport; 1424 1425 if (!(xprt = xprt_from_sock(sk))) 1426 return; 1427 transport = container_of(xprt, struct sock_xprt, xprt); 1428 if (sk->sk_shutdown & SHUTDOWN_MASK) { 1429 clear_bit(XPRT_CONNECTED, &xprt->state); 1430 /* Trigger the socket release */ 1431 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1432 } 1433 } 1434 1435 /** 1436 * xs_tcp_state_change - callback to handle TCP socket state changes 1437 * @sk: socket whose state has changed 1438 * 1439 */ 1440 static void xs_tcp_state_change(struct sock *sk) 1441 { 1442 struct rpc_xprt *xprt; 1443 struct sock_xprt *transport; 1444 1445 if (!(xprt = xprt_from_sock(sk))) 1446 return; 1447 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1448 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1449 sk->sk_state, xprt_connected(xprt), 1450 sock_flag(sk, SOCK_DEAD), 1451 sock_flag(sk, SOCK_ZAPPED), 1452 sk->sk_shutdown); 1453 1454 transport = container_of(xprt, struct sock_xprt, xprt); 1455 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1456 switch (sk->sk_state) { 1457 case TCP_ESTABLISHED: 1458 if (!xprt_test_and_set_connected(xprt)) { 1459 xprt->connect_cookie++; 1460 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1461 xprt_clear_connecting(xprt); 1462 1463 xprt->stat.connect_count++; 1464 xprt->stat.connect_time += (long)jiffies - 1465 xprt->stat.connect_start; 1466 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING); 1467 } 1468 break; 1469 case TCP_FIN_WAIT1: 1470 /* The client initiated a shutdown of the socket */ 1471 xprt->connect_cookie++; 1472 xprt->reestablish_timeout = 0; 1473 set_bit(XPRT_CLOSING, &xprt->state); 1474 smp_mb__before_atomic(); 1475 clear_bit(XPRT_CONNECTED, &xprt->state); 1476 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1477 smp_mb__after_atomic(); 1478 break; 1479 case TCP_CLOSE_WAIT: 1480 /* The server initiated a shutdown of the socket */ 1481 xprt->connect_cookie++; 1482 clear_bit(XPRT_CONNECTED, &xprt->state); 1483 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1484 fallthrough; 1485 case TCP_CLOSING: 1486 /* 1487 * If the server closed down the connection, make sure that 1488 * we back off before reconnecting 1489 */ 1490 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1491 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1492 break; 1493 case TCP_LAST_ACK: 1494 set_bit(XPRT_CLOSING, &xprt->state); 1495 smp_mb__before_atomic(); 1496 clear_bit(XPRT_CONNECTED, &xprt->state); 1497 smp_mb__after_atomic(); 1498 break; 1499 case TCP_CLOSE: 1500 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1501 &transport->sock_state)) 1502 xprt_clear_connecting(xprt); 1503 clear_bit(XPRT_CLOSING, &xprt->state); 1504 /* Trigger the socket release */ 1505 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1506 } 1507 } 1508 1509 static void xs_write_space(struct sock *sk) 1510 { 1511 struct sock_xprt *transport; 1512 struct rpc_xprt *xprt; 1513 1514 if (!sk->sk_socket) 1515 return; 1516 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1517 1518 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1519 return; 1520 transport = container_of(xprt, struct sock_xprt, xprt); 1521 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state)) 1522 return; 1523 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE); 1524 sk->sk_write_pending--; 1525 } 1526 1527 /** 1528 * xs_udp_write_space - callback invoked when socket buffer space 1529 * becomes available 1530 * @sk: socket whose state has changed 1531 * 1532 * Called when more output buffer space is available for this socket. 1533 * We try not to wake our writers until they can make "significant" 1534 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1535 * with a bunch of small requests. 1536 */ 1537 static void xs_udp_write_space(struct sock *sk) 1538 { 1539 /* from net/core/sock.c:sock_def_write_space */ 1540 if (sock_writeable(sk)) 1541 xs_write_space(sk); 1542 } 1543 1544 /** 1545 * xs_tcp_write_space - callback invoked when socket buffer space 1546 * becomes available 1547 * @sk: socket whose state has changed 1548 * 1549 * Called when more output buffer space is available for this socket. 1550 * We try not to wake our writers until they can make "significant" 1551 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1552 * with a bunch of small requests. 1553 */ 1554 static void xs_tcp_write_space(struct sock *sk) 1555 { 1556 /* from net/core/stream.c:sk_stream_write_space */ 1557 if (sk_stream_is_writeable(sk)) 1558 xs_write_space(sk); 1559 } 1560 1561 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1562 { 1563 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1564 struct sock *sk = transport->inet; 1565 1566 if (transport->rcvsize) { 1567 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1568 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1569 } 1570 if (transport->sndsize) { 1571 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1572 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1573 sk->sk_write_space(sk); 1574 } 1575 } 1576 1577 /** 1578 * xs_udp_set_buffer_size - set send and receive limits 1579 * @xprt: generic transport 1580 * @sndsize: requested size of send buffer, in bytes 1581 * @rcvsize: requested size of receive buffer, in bytes 1582 * 1583 * Set socket send and receive buffer size limits. 1584 */ 1585 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1586 { 1587 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1588 1589 transport->sndsize = 0; 1590 if (sndsize) 1591 transport->sndsize = sndsize + 1024; 1592 transport->rcvsize = 0; 1593 if (rcvsize) 1594 transport->rcvsize = rcvsize + 1024; 1595 1596 xs_udp_do_set_buffer_size(xprt); 1597 } 1598 1599 /** 1600 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1601 * @xprt: controlling transport 1602 * @task: task that timed out 1603 * 1604 * Adjust the congestion window after a retransmit timeout has occurred. 1605 */ 1606 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1607 { 1608 spin_lock(&xprt->transport_lock); 1609 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1610 spin_unlock(&xprt->transport_lock); 1611 } 1612 1613 static int xs_get_random_port(void) 1614 { 1615 unsigned short min = xprt_min_resvport, max = xprt_max_resvport; 1616 unsigned short range; 1617 unsigned short rand; 1618 1619 if (max < min) 1620 return -EADDRINUSE; 1621 range = max - min + 1; 1622 rand = prandom_u32_max(range); 1623 return rand + min; 1624 } 1625 1626 static unsigned short xs_sock_getport(struct socket *sock) 1627 { 1628 struct sockaddr_storage buf; 1629 unsigned short port = 0; 1630 1631 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) 1632 goto out; 1633 switch (buf.ss_family) { 1634 case AF_INET6: 1635 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1636 break; 1637 case AF_INET: 1638 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1639 } 1640 out: 1641 return port; 1642 } 1643 1644 /** 1645 * xs_set_port - reset the port number in the remote endpoint address 1646 * @xprt: generic transport 1647 * @port: new port number 1648 * 1649 */ 1650 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1651 { 1652 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1653 1654 rpc_set_port(xs_addr(xprt), port); 1655 xs_update_peer_port(xprt); 1656 } 1657 1658 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1659 { 1660 if (transport->srcport == 0 && transport->xprt.reuseport) 1661 transport->srcport = xs_sock_getport(sock); 1662 } 1663 1664 static int xs_get_srcport(struct sock_xprt *transport) 1665 { 1666 int port = transport->srcport; 1667 1668 if (port == 0 && transport->xprt.resvport) 1669 port = xs_get_random_port(); 1670 return port; 1671 } 1672 1673 static unsigned short xs_sock_srcport(struct rpc_xprt *xprt) 1674 { 1675 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1676 unsigned short ret = 0; 1677 mutex_lock(&sock->recv_mutex); 1678 if (sock->sock) 1679 ret = xs_sock_getport(sock->sock); 1680 mutex_unlock(&sock->recv_mutex); 1681 return ret; 1682 } 1683 1684 static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen) 1685 { 1686 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1687 union { 1688 struct sockaddr sa; 1689 struct sockaddr_storage st; 1690 } saddr; 1691 int ret = -ENOTCONN; 1692 1693 mutex_lock(&sock->recv_mutex); 1694 if (sock->sock) { 1695 ret = kernel_getsockname(sock->sock, &saddr.sa); 1696 if (ret >= 0) 1697 ret = snprintf(buf, buflen, "%pISc", &saddr.sa); 1698 } 1699 mutex_unlock(&sock->recv_mutex); 1700 return ret; 1701 } 1702 1703 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1704 { 1705 if (transport->srcport != 0) 1706 transport->srcport = 0; 1707 if (!transport->xprt.resvport) 1708 return 0; 1709 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1710 return xprt_max_resvport; 1711 return --port; 1712 } 1713 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1714 { 1715 struct sockaddr_storage myaddr; 1716 int err, nloop = 0; 1717 int port = xs_get_srcport(transport); 1718 unsigned short last; 1719 1720 /* 1721 * If we are asking for any ephemeral port (i.e. port == 0 && 1722 * transport->xprt.resvport == 0), don't bind. Let the local 1723 * port selection happen implicitly when the socket is used 1724 * (for example at connect time). 1725 * 1726 * This ensures that we can continue to establish TCP 1727 * connections even when all local ephemeral ports are already 1728 * a part of some TCP connection. This makes no difference 1729 * for UDP sockets, but also doesn't harm them. 1730 * 1731 * If we're asking for any reserved port (i.e. port == 0 && 1732 * transport->xprt.resvport == 1) xs_get_srcport above will 1733 * ensure that port is non-zero and we will bind as needed. 1734 */ 1735 if (port <= 0) 1736 return port; 1737 1738 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1739 do { 1740 rpc_set_port((struct sockaddr *)&myaddr, port); 1741 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1742 transport->xprt.addrlen); 1743 if (err == 0) { 1744 if (transport->xprt.reuseport) 1745 transport->srcport = port; 1746 break; 1747 } 1748 last = port; 1749 port = xs_next_srcport(transport, port); 1750 if (port > last) 1751 nloop++; 1752 } while (err == -EADDRINUSE && nloop != 2); 1753 1754 if (myaddr.ss_family == AF_INET) 1755 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1756 &((struct sockaddr_in *)&myaddr)->sin_addr, 1757 port, err ? "failed" : "ok", err); 1758 else 1759 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1760 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1761 port, err ? "failed" : "ok", err); 1762 return err; 1763 } 1764 1765 /* 1766 * We don't support autobind on AF_LOCAL sockets 1767 */ 1768 static void xs_local_rpcbind(struct rpc_task *task) 1769 { 1770 xprt_set_bound(task->tk_xprt); 1771 } 1772 1773 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1774 { 1775 } 1776 1777 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1778 static struct lock_class_key xs_key[3]; 1779 static struct lock_class_key xs_slock_key[3]; 1780 1781 static inline void xs_reclassify_socketu(struct socket *sock) 1782 { 1783 struct sock *sk = sock->sk; 1784 1785 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1786 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]); 1787 } 1788 1789 static inline void xs_reclassify_socket4(struct socket *sock) 1790 { 1791 struct sock *sk = sock->sk; 1792 1793 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1794 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]); 1795 } 1796 1797 static inline void xs_reclassify_socket6(struct socket *sock) 1798 { 1799 struct sock *sk = sock->sk; 1800 1801 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1802 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]); 1803 } 1804 1805 static inline void xs_reclassify_socket(int family, struct socket *sock) 1806 { 1807 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1808 return; 1809 1810 switch (family) { 1811 case AF_LOCAL: 1812 xs_reclassify_socketu(sock); 1813 break; 1814 case AF_INET: 1815 xs_reclassify_socket4(sock); 1816 break; 1817 case AF_INET6: 1818 xs_reclassify_socket6(sock); 1819 break; 1820 } 1821 } 1822 #else 1823 static inline void xs_reclassify_socket(int family, struct socket *sock) 1824 { 1825 } 1826 #endif 1827 1828 static void xs_dummy_setup_socket(struct work_struct *work) 1829 { 1830 } 1831 1832 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1833 struct sock_xprt *transport, int family, int type, 1834 int protocol, bool reuseport) 1835 { 1836 struct file *filp; 1837 struct socket *sock; 1838 int err; 1839 1840 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1841 if (err < 0) { 1842 dprintk("RPC: can't create %d transport socket (%d).\n", 1843 protocol, -err); 1844 goto out; 1845 } 1846 xs_reclassify_socket(family, sock); 1847 1848 if (reuseport) 1849 sock_set_reuseport(sock->sk); 1850 1851 err = xs_bind(transport, sock); 1852 if (err) { 1853 sock_release(sock); 1854 goto out; 1855 } 1856 1857 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1858 if (IS_ERR(filp)) 1859 return ERR_CAST(filp); 1860 transport->file = filp; 1861 1862 return sock; 1863 out: 1864 return ERR_PTR(err); 1865 } 1866 1867 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1868 struct socket *sock) 1869 { 1870 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1871 xprt); 1872 1873 if (!transport->inet) { 1874 struct sock *sk = sock->sk; 1875 1876 lock_sock(sk); 1877 1878 xs_save_old_callbacks(transport, sk); 1879 1880 sk->sk_user_data = xprt; 1881 sk->sk_data_ready = xs_data_ready; 1882 sk->sk_write_space = xs_udp_write_space; 1883 sk->sk_state_change = xs_local_state_change; 1884 sk->sk_error_report = xs_error_report; 1885 1886 xprt_clear_connected(xprt); 1887 1888 /* Reset to new socket */ 1889 transport->sock = sock; 1890 transport->inet = sk; 1891 1892 release_sock(sk); 1893 } 1894 1895 xs_stream_start_connect(transport); 1896 1897 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1898 } 1899 1900 /** 1901 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1902 * @transport: socket transport to connect 1903 */ 1904 static int xs_local_setup_socket(struct sock_xprt *transport) 1905 { 1906 struct rpc_xprt *xprt = &transport->xprt; 1907 struct file *filp; 1908 struct socket *sock; 1909 int status; 1910 1911 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1912 SOCK_STREAM, 0, &sock, 1); 1913 if (status < 0) { 1914 dprintk("RPC: can't create AF_LOCAL " 1915 "transport socket (%d).\n", -status); 1916 goto out; 1917 } 1918 xs_reclassify_socket(AF_LOCAL, sock); 1919 1920 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1921 if (IS_ERR(filp)) { 1922 status = PTR_ERR(filp); 1923 goto out; 1924 } 1925 transport->file = filp; 1926 1927 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1928 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1929 1930 status = xs_local_finish_connecting(xprt, sock); 1931 trace_rpc_socket_connect(xprt, sock, status); 1932 switch (status) { 1933 case 0: 1934 dprintk("RPC: xprt %p connected to %s\n", 1935 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1936 xprt->stat.connect_count++; 1937 xprt->stat.connect_time += (long)jiffies - 1938 xprt->stat.connect_start; 1939 xprt_set_connected(xprt); 1940 break; 1941 case -ENOBUFS: 1942 break; 1943 case -ENOENT: 1944 dprintk("RPC: xprt %p: socket %s does not exist\n", 1945 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1946 break; 1947 case -ECONNREFUSED: 1948 dprintk("RPC: xprt %p: connection refused for %s\n", 1949 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1950 break; 1951 default: 1952 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1953 __func__, -status, 1954 xprt->address_strings[RPC_DISPLAY_ADDR]); 1955 } 1956 1957 out: 1958 xprt_clear_connecting(xprt); 1959 xprt_wake_pending_tasks(xprt, status); 1960 return status; 1961 } 1962 1963 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1964 { 1965 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1966 int ret; 1967 1968 if (transport->file) 1969 goto force_disconnect; 1970 1971 if (RPC_IS_ASYNC(task)) { 1972 /* 1973 * We want the AF_LOCAL connect to be resolved in the 1974 * filesystem namespace of the process making the rpc 1975 * call. Thus we connect synchronously. 1976 * 1977 * If we want to support asynchronous AF_LOCAL calls, 1978 * we'll need to figure out how to pass a namespace to 1979 * connect. 1980 */ 1981 rpc_task_set_rpc_status(task, -ENOTCONN); 1982 goto out_wake; 1983 } 1984 ret = xs_local_setup_socket(transport); 1985 if (ret && !RPC_IS_SOFTCONN(task)) 1986 msleep_interruptible(15000); 1987 return; 1988 force_disconnect: 1989 xprt_force_disconnect(xprt); 1990 out_wake: 1991 xprt_clear_connecting(xprt); 1992 xprt_wake_pending_tasks(xprt, -ENOTCONN); 1993 } 1994 1995 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 1996 /* 1997 * Note that this should be called with XPRT_LOCKED held, or recv_mutex 1998 * held, or when we otherwise know that we have exclusive access to the 1999 * socket, to guard against races with xs_reset_transport. 2000 */ 2001 static void xs_set_memalloc(struct rpc_xprt *xprt) 2002 { 2003 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2004 xprt); 2005 2006 /* 2007 * If there's no sock, then we have nothing to set. The 2008 * reconnecting process will get it for us. 2009 */ 2010 if (!transport->inet) 2011 return; 2012 if (atomic_read(&xprt->swapper)) 2013 sk_set_memalloc(transport->inet); 2014 } 2015 2016 /** 2017 * xs_enable_swap - Tag this transport as being used for swap. 2018 * @xprt: transport to tag 2019 * 2020 * Take a reference to this transport on behalf of the rpc_clnt, and 2021 * optionally mark it for swapping if it wasn't already. 2022 */ 2023 static int 2024 xs_enable_swap(struct rpc_xprt *xprt) 2025 { 2026 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2027 2028 mutex_lock(&xs->recv_mutex); 2029 if (atomic_inc_return(&xprt->swapper) == 1 && 2030 xs->inet) 2031 sk_set_memalloc(xs->inet); 2032 mutex_unlock(&xs->recv_mutex); 2033 return 0; 2034 } 2035 2036 /** 2037 * xs_disable_swap - Untag this transport as being used for swap. 2038 * @xprt: transport to tag 2039 * 2040 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2041 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2042 */ 2043 static void 2044 xs_disable_swap(struct rpc_xprt *xprt) 2045 { 2046 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2047 2048 mutex_lock(&xs->recv_mutex); 2049 if (atomic_dec_and_test(&xprt->swapper) && 2050 xs->inet) 2051 sk_clear_memalloc(xs->inet); 2052 mutex_unlock(&xs->recv_mutex); 2053 } 2054 #else 2055 static void xs_set_memalloc(struct rpc_xprt *xprt) 2056 { 2057 } 2058 2059 static int 2060 xs_enable_swap(struct rpc_xprt *xprt) 2061 { 2062 return -EINVAL; 2063 } 2064 2065 static void 2066 xs_disable_swap(struct rpc_xprt *xprt) 2067 { 2068 } 2069 #endif 2070 2071 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2072 { 2073 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2074 2075 if (!transport->inet) { 2076 struct sock *sk = sock->sk; 2077 2078 lock_sock(sk); 2079 2080 xs_save_old_callbacks(transport, sk); 2081 2082 sk->sk_user_data = xprt; 2083 sk->sk_data_ready = xs_data_ready; 2084 sk->sk_write_space = xs_udp_write_space; 2085 2086 xprt_set_connected(xprt); 2087 2088 /* Reset to new socket */ 2089 transport->sock = sock; 2090 transport->inet = sk; 2091 2092 xs_set_memalloc(xprt); 2093 2094 release_sock(sk); 2095 } 2096 xs_udp_do_set_buffer_size(xprt); 2097 2098 xprt->stat.connect_start = jiffies; 2099 } 2100 2101 static void xs_udp_setup_socket(struct work_struct *work) 2102 { 2103 struct sock_xprt *transport = 2104 container_of(work, struct sock_xprt, connect_worker.work); 2105 struct rpc_xprt *xprt = &transport->xprt; 2106 struct socket *sock; 2107 int status = -EIO; 2108 unsigned int pflags = current->flags; 2109 2110 if (atomic_read(&xprt->swapper)) 2111 current->flags |= PF_MEMALLOC; 2112 sock = xs_create_sock(xprt, transport, 2113 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2114 IPPROTO_UDP, false); 2115 if (IS_ERR(sock)) 2116 goto out; 2117 2118 dprintk("RPC: worker connecting xprt %p via %s to " 2119 "%s (port %s)\n", xprt, 2120 xprt->address_strings[RPC_DISPLAY_PROTO], 2121 xprt->address_strings[RPC_DISPLAY_ADDR], 2122 xprt->address_strings[RPC_DISPLAY_PORT]); 2123 2124 xs_udp_finish_connecting(xprt, sock); 2125 trace_rpc_socket_connect(xprt, sock, 0); 2126 status = 0; 2127 out: 2128 xprt_clear_connecting(xprt); 2129 xprt_unlock_connect(xprt, transport); 2130 xprt_wake_pending_tasks(xprt, status); 2131 current_restore_flags(pflags, PF_MEMALLOC); 2132 } 2133 2134 /** 2135 * xs_tcp_shutdown - gracefully shut down a TCP socket 2136 * @xprt: transport 2137 * 2138 * Initiates a graceful shutdown of the TCP socket by calling the 2139 * equivalent of shutdown(SHUT_RDWR); 2140 */ 2141 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2142 { 2143 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2144 struct socket *sock = transport->sock; 2145 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; 2146 2147 if (sock == NULL) 2148 return; 2149 if (!xprt->reuseport) { 2150 xs_close(xprt); 2151 return; 2152 } 2153 switch (skst) { 2154 case TCP_FIN_WAIT1: 2155 case TCP_FIN_WAIT2: 2156 break; 2157 case TCP_ESTABLISHED: 2158 case TCP_CLOSE_WAIT: 2159 kernel_sock_shutdown(sock, SHUT_RDWR); 2160 trace_rpc_socket_shutdown(xprt, sock); 2161 break; 2162 default: 2163 xs_reset_transport(transport); 2164 } 2165 } 2166 2167 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2168 struct socket *sock) 2169 { 2170 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2171 unsigned int keepidle; 2172 unsigned int keepcnt; 2173 unsigned int timeo; 2174 2175 spin_lock(&xprt->transport_lock); 2176 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2177 keepcnt = xprt->timeout->to_retries + 1; 2178 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2179 (xprt->timeout->to_retries + 1); 2180 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2181 spin_unlock(&xprt->transport_lock); 2182 2183 /* TCP Keepalive options */ 2184 sock_set_keepalive(sock->sk); 2185 tcp_sock_set_keepidle(sock->sk, keepidle); 2186 tcp_sock_set_keepintvl(sock->sk, keepidle); 2187 tcp_sock_set_keepcnt(sock->sk, keepcnt); 2188 2189 /* TCP user timeout (see RFC5482) */ 2190 tcp_sock_set_user_timeout(sock->sk, timeo); 2191 } 2192 2193 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2194 unsigned long connect_timeout, 2195 unsigned long reconnect_timeout) 2196 { 2197 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2198 struct rpc_timeout to; 2199 unsigned long initval; 2200 2201 spin_lock(&xprt->transport_lock); 2202 if (reconnect_timeout < xprt->max_reconnect_timeout) 2203 xprt->max_reconnect_timeout = reconnect_timeout; 2204 if (connect_timeout < xprt->connect_timeout) { 2205 memcpy(&to, xprt->timeout, sizeof(to)); 2206 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2207 /* Arbitrary lower limit */ 2208 if (initval < XS_TCP_INIT_REEST_TO << 1) 2209 initval = XS_TCP_INIT_REEST_TO << 1; 2210 to.to_initval = initval; 2211 to.to_maxval = initval; 2212 memcpy(&transport->tcp_timeout, &to, 2213 sizeof(transport->tcp_timeout)); 2214 xprt->timeout = &transport->tcp_timeout; 2215 xprt->connect_timeout = connect_timeout; 2216 } 2217 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2218 spin_unlock(&xprt->transport_lock); 2219 } 2220 2221 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2222 { 2223 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2224 2225 if (!transport->inet) { 2226 struct sock *sk = sock->sk; 2227 2228 /* Avoid temporary address, they are bad for long-lived 2229 * connections such as NFS mounts. 2230 * RFC4941, section 3.6 suggests that: 2231 * Individual applications, which have specific 2232 * knowledge about the normal duration of connections, 2233 * MAY override this as appropriate. 2234 */ 2235 if (xs_addr(xprt)->sa_family == PF_INET6) { 2236 ip6_sock_set_addr_preferences(sk, 2237 IPV6_PREFER_SRC_PUBLIC); 2238 } 2239 2240 xs_tcp_set_socket_timeouts(xprt, sock); 2241 tcp_sock_set_nodelay(sk); 2242 2243 lock_sock(sk); 2244 2245 xs_save_old_callbacks(transport, sk); 2246 2247 sk->sk_user_data = xprt; 2248 sk->sk_data_ready = xs_data_ready; 2249 sk->sk_state_change = xs_tcp_state_change; 2250 sk->sk_write_space = xs_tcp_write_space; 2251 sk->sk_error_report = xs_error_report; 2252 2253 /* socket options */ 2254 sock_reset_flag(sk, SOCK_LINGER); 2255 2256 xprt_clear_connected(xprt); 2257 2258 /* Reset to new socket */ 2259 transport->sock = sock; 2260 transport->inet = sk; 2261 2262 release_sock(sk); 2263 } 2264 2265 if (!xprt_bound(xprt)) 2266 return -ENOTCONN; 2267 2268 xs_set_memalloc(xprt); 2269 2270 xs_stream_start_connect(transport); 2271 2272 /* Tell the socket layer to start connecting... */ 2273 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2274 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2275 } 2276 2277 /** 2278 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2279 * @work: queued work item 2280 * 2281 * Invoked by a work queue tasklet. 2282 */ 2283 static void xs_tcp_setup_socket(struct work_struct *work) 2284 { 2285 struct sock_xprt *transport = 2286 container_of(work, struct sock_xprt, connect_worker.work); 2287 struct socket *sock = transport->sock; 2288 struct rpc_xprt *xprt = &transport->xprt; 2289 int status; 2290 unsigned int pflags = current->flags; 2291 2292 if (atomic_read(&xprt->swapper)) 2293 current->flags |= PF_MEMALLOC; 2294 2295 if (xprt_connected(xprt)) 2296 goto out; 2297 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT, 2298 &transport->sock_state) || 2299 !sock) { 2300 xs_reset_transport(transport); 2301 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family, 2302 SOCK_STREAM, IPPROTO_TCP, true); 2303 if (IS_ERR(sock)) { 2304 xprt_wake_pending_tasks(xprt, PTR_ERR(sock)); 2305 goto out; 2306 } 2307 } 2308 2309 dprintk("RPC: worker connecting xprt %p via %s to " 2310 "%s (port %s)\n", xprt, 2311 xprt->address_strings[RPC_DISPLAY_PROTO], 2312 xprt->address_strings[RPC_DISPLAY_ADDR], 2313 xprt->address_strings[RPC_DISPLAY_PORT]); 2314 2315 status = xs_tcp_finish_connecting(xprt, sock); 2316 trace_rpc_socket_connect(xprt, sock, status); 2317 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2318 xprt, -status, xprt_connected(xprt), 2319 sock->sk->sk_state); 2320 switch (status) { 2321 case 0: 2322 case -EINPROGRESS: 2323 /* SYN_SENT! */ 2324 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state); 2325 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2326 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2327 fallthrough; 2328 case -EALREADY: 2329 goto out_unlock; 2330 case -EADDRNOTAVAIL: 2331 /* Source port number is unavailable. Try a new one! */ 2332 transport->srcport = 0; 2333 status = -EAGAIN; 2334 break; 2335 case -EINVAL: 2336 /* Happens, for instance, if the user specified a link 2337 * local IPv6 address without a scope-id. 2338 */ 2339 case -ECONNREFUSED: 2340 case -ECONNRESET: 2341 case -ENETDOWN: 2342 case -ENETUNREACH: 2343 case -EHOSTUNREACH: 2344 case -EADDRINUSE: 2345 case -ENOBUFS: 2346 break; 2347 default: 2348 printk("%s: connect returned unhandled error %d\n", 2349 __func__, status); 2350 status = -EAGAIN; 2351 } 2352 2353 /* xs_tcp_force_close() wakes tasks with a fixed error code. 2354 * We need to wake them first to ensure the correct error code. 2355 */ 2356 xprt_wake_pending_tasks(xprt, status); 2357 xs_tcp_force_close(xprt); 2358 out: 2359 xprt_clear_connecting(xprt); 2360 out_unlock: 2361 xprt_unlock_connect(xprt, transport); 2362 current_restore_flags(pflags, PF_MEMALLOC); 2363 } 2364 2365 /** 2366 * xs_connect - connect a socket to a remote endpoint 2367 * @xprt: pointer to transport structure 2368 * @task: address of RPC task that manages state of connect request 2369 * 2370 * TCP: If the remote end dropped the connection, delay reconnecting. 2371 * 2372 * UDP socket connects are synchronous, but we use a work queue anyway 2373 * to guarantee that even unprivileged user processes can set up a 2374 * socket on a privileged port. 2375 * 2376 * If a UDP socket connect fails, the delay behavior here prevents 2377 * retry floods (hard mounts). 2378 */ 2379 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2380 { 2381 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2382 unsigned long delay = 0; 2383 2384 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2385 2386 if (transport->sock != NULL) { 2387 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2388 "seconds\n", xprt, xprt->reestablish_timeout / HZ); 2389 2390 delay = xprt_reconnect_delay(xprt); 2391 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); 2392 2393 } else 2394 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2395 2396 queue_delayed_work(xprtiod_workqueue, 2397 &transport->connect_worker, 2398 delay); 2399 } 2400 2401 static void xs_wake_disconnect(struct sock_xprt *transport) 2402 { 2403 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state)) 2404 xs_tcp_force_close(&transport->xprt); 2405 } 2406 2407 static void xs_wake_write(struct sock_xprt *transport) 2408 { 2409 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state)) 2410 xprt_write_space(&transport->xprt); 2411 } 2412 2413 static void xs_wake_error(struct sock_xprt *transport) 2414 { 2415 int sockerr; 2416 2417 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2418 return; 2419 mutex_lock(&transport->recv_mutex); 2420 if (transport->sock == NULL) 2421 goto out; 2422 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2423 goto out; 2424 sockerr = xchg(&transport->xprt_err, 0); 2425 if (sockerr < 0) 2426 xprt_wake_pending_tasks(&transport->xprt, sockerr); 2427 out: 2428 mutex_unlock(&transport->recv_mutex); 2429 } 2430 2431 static void xs_wake_pending(struct sock_xprt *transport) 2432 { 2433 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state)) 2434 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN); 2435 } 2436 2437 static void xs_error_handle(struct work_struct *work) 2438 { 2439 struct sock_xprt *transport = container_of(work, 2440 struct sock_xprt, error_worker); 2441 2442 xs_wake_disconnect(transport); 2443 xs_wake_write(transport); 2444 xs_wake_error(transport); 2445 xs_wake_pending(transport); 2446 } 2447 2448 /** 2449 * xs_local_print_stats - display AF_LOCAL socket-specific stats 2450 * @xprt: rpc_xprt struct containing statistics 2451 * @seq: output file 2452 * 2453 */ 2454 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2455 { 2456 long idle_time = 0; 2457 2458 if (xprt_connected(xprt)) 2459 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2460 2461 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2462 "%llu %llu %lu %llu %llu\n", 2463 xprt->stat.bind_count, 2464 xprt->stat.connect_count, 2465 xprt->stat.connect_time / HZ, 2466 idle_time, 2467 xprt->stat.sends, 2468 xprt->stat.recvs, 2469 xprt->stat.bad_xids, 2470 xprt->stat.req_u, 2471 xprt->stat.bklog_u, 2472 xprt->stat.max_slots, 2473 xprt->stat.sending_u, 2474 xprt->stat.pending_u); 2475 } 2476 2477 /** 2478 * xs_udp_print_stats - display UDP socket-specific stats 2479 * @xprt: rpc_xprt struct containing statistics 2480 * @seq: output file 2481 * 2482 */ 2483 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2484 { 2485 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2486 2487 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2488 "%lu %llu %llu\n", 2489 transport->srcport, 2490 xprt->stat.bind_count, 2491 xprt->stat.sends, 2492 xprt->stat.recvs, 2493 xprt->stat.bad_xids, 2494 xprt->stat.req_u, 2495 xprt->stat.bklog_u, 2496 xprt->stat.max_slots, 2497 xprt->stat.sending_u, 2498 xprt->stat.pending_u); 2499 } 2500 2501 /** 2502 * xs_tcp_print_stats - display TCP socket-specific stats 2503 * @xprt: rpc_xprt struct containing statistics 2504 * @seq: output file 2505 * 2506 */ 2507 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2508 { 2509 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2510 long idle_time = 0; 2511 2512 if (xprt_connected(xprt)) 2513 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2514 2515 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2516 "%llu %llu %lu %llu %llu\n", 2517 transport->srcport, 2518 xprt->stat.bind_count, 2519 xprt->stat.connect_count, 2520 xprt->stat.connect_time / HZ, 2521 idle_time, 2522 xprt->stat.sends, 2523 xprt->stat.recvs, 2524 xprt->stat.bad_xids, 2525 xprt->stat.req_u, 2526 xprt->stat.bklog_u, 2527 xprt->stat.max_slots, 2528 xprt->stat.sending_u, 2529 xprt->stat.pending_u); 2530 } 2531 2532 /* 2533 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2534 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2535 * to use the server side send routines. 2536 */ 2537 static int bc_malloc(struct rpc_task *task) 2538 { 2539 struct rpc_rqst *rqst = task->tk_rqstp; 2540 size_t size = rqst->rq_callsize; 2541 struct page *page; 2542 struct rpc_buffer *buf; 2543 2544 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2545 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2546 size); 2547 return -EINVAL; 2548 } 2549 2550 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); 2551 if (!page) 2552 return -ENOMEM; 2553 2554 buf = page_address(page); 2555 buf->len = PAGE_SIZE; 2556 2557 rqst->rq_buffer = buf->data; 2558 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2559 return 0; 2560 } 2561 2562 /* 2563 * Free the space allocated in the bc_alloc routine 2564 */ 2565 static void bc_free(struct rpc_task *task) 2566 { 2567 void *buffer = task->tk_rqstp->rq_buffer; 2568 struct rpc_buffer *buf; 2569 2570 buf = container_of(buffer, struct rpc_buffer, data); 2571 free_page((unsigned long)buf); 2572 } 2573 2574 static int bc_sendto(struct rpc_rqst *req) 2575 { 2576 struct xdr_buf *xdr = &req->rq_snd_buf; 2577 struct sock_xprt *transport = 2578 container_of(req->rq_xprt, struct sock_xprt, xprt); 2579 struct msghdr msg = { 2580 .msg_flags = 0, 2581 }; 2582 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | 2583 (u32)xdr->len); 2584 unsigned int sent = 0; 2585 int err; 2586 2587 req->rq_xtime = ktime_get(); 2588 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask()); 2589 if (err < 0) 2590 return err; 2591 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent); 2592 xdr_free_bvec(xdr); 2593 if (err < 0 || sent != (xdr->len + sizeof(marker))) 2594 return -EAGAIN; 2595 return sent; 2596 } 2597 2598 /** 2599 * bc_send_request - Send a backchannel Call on a TCP socket 2600 * @req: rpc_rqst containing Call message to be sent 2601 * 2602 * xpt_mutex ensures @rqstp's whole message is written to the socket 2603 * without interruption. 2604 * 2605 * Return values: 2606 * %0 if the message was sent successfully 2607 * %ENOTCONN if the message was not sent 2608 */ 2609 static int bc_send_request(struct rpc_rqst *req) 2610 { 2611 struct svc_xprt *xprt; 2612 int len; 2613 2614 /* 2615 * Get the server socket associated with this callback xprt 2616 */ 2617 xprt = req->rq_xprt->bc_xprt; 2618 2619 /* 2620 * Grab the mutex to serialize data as the connection is shared 2621 * with the fore channel 2622 */ 2623 mutex_lock(&xprt->xpt_mutex); 2624 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2625 len = -ENOTCONN; 2626 else 2627 len = bc_sendto(req); 2628 mutex_unlock(&xprt->xpt_mutex); 2629 2630 if (len > 0) 2631 len = 0; 2632 2633 return len; 2634 } 2635 2636 /* 2637 * The close routine. Since this is client initiated, we do nothing 2638 */ 2639 2640 static void bc_close(struct rpc_xprt *xprt) 2641 { 2642 xprt_disconnect_done(xprt); 2643 } 2644 2645 /* 2646 * The xprt destroy routine. Again, because this connection is client 2647 * initiated, we do nothing 2648 */ 2649 2650 static void bc_destroy(struct rpc_xprt *xprt) 2651 { 2652 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2653 2654 xs_xprt_free(xprt); 2655 module_put(THIS_MODULE); 2656 } 2657 2658 static const struct rpc_xprt_ops xs_local_ops = { 2659 .reserve_xprt = xprt_reserve_xprt, 2660 .release_xprt = xprt_release_xprt, 2661 .alloc_slot = xprt_alloc_slot, 2662 .free_slot = xprt_free_slot, 2663 .rpcbind = xs_local_rpcbind, 2664 .set_port = xs_local_set_port, 2665 .connect = xs_local_connect, 2666 .buf_alloc = rpc_malloc, 2667 .buf_free = rpc_free, 2668 .prepare_request = xs_stream_prepare_request, 2669 .send_request = xs_local_send_request, 2670 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2671 .close = xs_close, 2672 .destroy = xs_destroy, 2673 .print_stats = xs_local_print_stats, 2674 .enable_swap = xs_enable_swap, 2675 .disable_swap = xs_disable_swap, 2676 }; 2677 2678 static const struct rpc_xprt_ops xs_udp_ops = { 2679 .set_buffer_size = xs_udp_set_buffer_size, 2680 .reserve_xprt = xprt_reserve_xprt_cong, 2681 .release_xprt = xprt_release_xprt_cong, 2682 .alloc_slot = xprt_alloc_slot, 2683 .free_slot = xprt_free_slot, 2684 .rpcbind = rpcb_getport_async, 2685 .set_port = xs_set_port, 2686 .connect = xs_connect, 2687 .get_srcaddr = xs_sock_srcaddr, 2688 .get_srcport = xs_sock_srcport, 2689 .buf_alloc = rpc_malloc, 2690 .buf_free = rpc_free, 2691 .send_request = xs_udp_send_request, 2692 .wait_for_reply_request = xprt_wait_for_reply_request_rtt, 2693 .timer = xs_udp_timer, 2694 .release_request = xprt_release_rqst_cong, 2695 .close = xs_close, 2696 .destroy = xs_destroy, 2697 .print_stats = xs_udp_print_stats, 2698 .enable_swap = xs_enable_swap, 2699 .disable_swap = xs_disable_swap, 2700 .inject_disconnect = xs_inject_disconnect, 2701 }; 2702 2703 static const struct rpc_xprt_ops xs_tcp_ops = { 2704 .reserve_xprt = xprt_reserve_xprt, 2705 .release_xprt = xprt_release_xprt, 2706 .alloc_slot = xprt_alloc_slot, 2707 .free_slot = xprt_free_slot, 2708 .rpcbind = rpcb_getport_async, 2709 .set_port = xs_set_port, 2710 .connect = xs_connect, 2711 .get_srcaddr = xs_sock_srcaddr, 2712 .get_srcport = xs_sock_srcport, 2713 .buf_alloc = rpc_malloc, 2714 .buf_free = rpc_free, 2715 .prepare_request = xs_stream_prepare_request, 2716 .send_request = xs_tcp_send_request, 2717 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2718 .close = xs_tcp_shutdown, 2719 .destroy = xs_destroy, 2720 .set_connect_timeout = xs_tcp_set_connect_timeout, 2721 .print_stats = xs_tcp_print_stats, 2722 .enable_swap = xs_enable_swap, 2723 .disable_swap = xs_disable_swap, 2724 .inject_disconnect = xs_inject_disconnect, 2725 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2726 .bc_setup = xprt_setup_bc, 2727 .bc_maxpayload = xs_tcp_bc_maxpayload, 2728 .bc_num_slots = xprt_bc_max_slots, 2729 .bc_free_rqst = xprt_free_bc_rqst, 2730 .bc_destroy = xprt_destroy_bc, 2731 #endif 2732 }; 2733 2734 /* 2735 * The rpc_xprt_ops for the server backchannel 2736 */ 2737 2738 static const struct rpc_xprt_ops bc_tcp_ops = { 2739 .reserve_xprt = xprt_reserve_xprt, 2740 .release_xprt = xprt_release_xprt, 2741 .alloc_slot = xprt_alloc_slot, 2742 .free_slot = xprt_free_slot, 2743 .buf_alloc = bc_malloc, 2744 .buf_free = bc_free, 2745 .send_request = bc_send_request, 2746 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2747 .close = bc_close, 2748 .destroy = bc_destroy, 2749 .print_stats = xs_tcp_print_stats, 2750 .enable_swap = xs_enable_swap, 2751 .disable_swap = xs_disable_swap, 2752 .inject_disconnect = xs_inject_disconnect, 2753 }; 2754 2755 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2756 { 2757 static const struct sockaddr_in sin = { 2758 .sin_family = AF_INET, 2759 .sin_addr.s_addr = htonl(INADDR_ANY), 2760 }; 2761 static const struct sockaddr_in6 sin6 = { 2762 .sin6_family = AF_INET6, 2763 .sin6_addr = IN6ADDR_ANY_INIT, 2764 }; 2765 2766 switch (family) { 2767 case AF_LOCAL: 2768 break; 2769 case AF_INET: 2770 memcpy(sap, &sin, sizeof(sin)); 2771 break; 2772 case AF_INET6: 2773 memcpy(sap, &sin6, sizeof(sin6)); 2774 break; 2775 default: 2776 dprintk("RPC: %s: Bad address family\n", __func__); 2777 return -EAFNOSUPPORT; 2778 } 2779 return 0; 2780 } 2781 2782 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2783 unsigned int slot_table_size, 2784 unsigned int max_slot_table_size) 2785 { 2786 struct rpc_xprt *xprt; 2787 struct sock_xprt *new; 2788 2789 if (args->addrlen > sizeof(xprt->addr)) { 2790 dprintk("RPC: xs_setup_xprt: address too large\n"); 2791 return ERR_PTR(-EBADF); 2792 } 2793 2794 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2795 max_slot_table_size); 2796 if (xprt == NULL) { 2797 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2798 "rpc_xprt\n"); 2799 return ERR_PTR(-ENOMEM); 2800 } 2801 2802 new = container_of(xprt, struct sock_xprt, xprt); 2803 mutex_init(&new->recv_mutex); 2804 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2805 xprt->addrlen = args->addrlen; 2806 if (args->srcaddr) 2807 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2808 else { 2809 int err; 2810 err = xs_init_anyaddr(args->dstaddr->sa_family, 2811 (struct sockaddr *)&new->srcaddr); 2812 if (err != 0) { 2813 xprt_free(xprt); 2814 return ERR_PTR(err); 2815 } 2816 } 2817 2818 return xprt; 2819 } 2820 2821 static const struct rpc_timeout xs_local_default_timeout = { 2822 .to_initval = 10 * HZ, 2823 .to_maxval = 10 * HZ, 2824 .to_retries = 2, 2825 }; 2826 2827 /** 2828 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2829 * @args: rpc transport creation arguments 2830 * 2831 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2832 */ 2833 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2834 { 2835 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2836 struct sock_xprt *transport; 2837 struct rpc_xprt *xprt; 2838 struct rpc_xprt *ret; 2839 2840 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2841 xprt_max_tcp_slot_table_entries); 2842 if (IS_ERR(xprt)) 2843 return xprt; 2844 transport = container_of(xprt, struct sock_xprt, xprt); 2845 2846 xprt->prot = 0; 2847 xprt->xprt_class = &xs_local_transport; 2848 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2849 2850 xprt->bind_timeout = XS_BIND_TO; 2851 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2852 xprt->idle_timeout = XS_IDLE_DISC_TO; 2853 2854 xprt->ops = &xs_local_ops; 2855 xprt->timeout = &xs_local_default_timeout; 2856 2857 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2858 INIT_WORK(&transport->error_worker, xs_error_handle); 2859 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); 2860 2861 switch (sun->sun_family) { 2862 case AF_LOCAL: 2863 if (sun->sun_path[0] != '/') { 2864 dprintk("RPC: bad AF_LOCAL address: %s\n", 2865 sun->sun_path); 2866 ret = ERR_PTR(-EINVAL); 2867 goto out_err; 2868 } 2869 xprt_set_bound(xprt); 2870 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2871 break; 2872 default: 2873 ret = ERR_PTR(-EAFNOSUPPORT); 2874 goto out_err; 2875 } 2876 2877 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2878 xprt->address_strings[RPC_DISPLAY_ADDR]); 2879 2880 if (try_module_get(THIS_MODULE)) 2881 return xprt; 2882 ret = ERR_PTR(-EINVAL); 2883 out_err: 2884 xs_xprt_free(xprt); 2885 return ret; 2886 } 2887 2888 static const struct rpc_timeout xs_udp_default_timeout = { 2889 .to_initval = 5 * HZ, 2890 .to_maxval = 30 * HZ, 2891 .to_increment = 5 * HZ, 2892 .to_retries = 5, 2893 }; 2894 2895 /** 2896 * xs_setup_udp - Set up transport to use a UDP socket 2897 * @args: rpc transport creation arguments 2898 * 2899 */ 2900 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2901 { 2902 struct sockaddr *addr = args->dstaddr; 2903 struct rpc_xprt *xprt; 2904 struct sock_xprt *transport; 2905 struct rpc_xprt *ret; 2906 2907 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2908 xprt_udp_slot_table_entries); 2909 if (IS_ERR(xprt)) 2910 return xprt; 2911 transport = container_of(xprt, struct sock_xprt, xprt); 2912 2913 xprt->prot = IPPROTO_UDP; 2914 xprt->xprt_class = &xs_udp_transport; 2915 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2916 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2917 2918 xprt->bind_timeout = XS_BIND_TO; 2919 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2920 xprt->idle_timeout = XS_IDLE_DISC_TO; 2921 2922 xprt->ops = &xs_udp_ops; 2923 2924 xprt->timeout = &xs_udp_default_timeout; 2925 2926 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2927 INIT_WORK(&transport->error_worker, xs_error_handle); 2928 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2929 2930 switch (addr->sa_family) { 2931 case AF_INET: 2932 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2933 xprt_set_bound(xprt); 2934 2935 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2936 break; 2937 case AF_INET6: 2938 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2939 xprt_set_bound(xprt); 2940 2941 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2942 break; 2943 default: 2944 ret = ERR_PTR(-EAFNOSUPPORT); 2945 goto out_err; 2946 } 2947 2948 if (xprt_bound(xprt)) 2949 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2950 xprt->address_strings[RPC_DISPLAY_ADDR], 2951 xprt->address_strings[RPC_DISPLAY_PORT], 2952 xprt->address_strings[RPC_DISPLAY_PROTO]); 2953 else 2954 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2955 xprt->address_strings[RPC_DISPLAY_ADDR], 2956 xprt->address_strings[RPC_DISPLAY_PROTO]); 2957 2958 if (try_module_get(THIS_MODULE)) 2959 return xprt; 2960 ret = ERR_PTR(-EINVAL); 2961 out_err: 2962 xs_xprt_free(xprt); 2963 return ret; 2964 } 2965 2966 static const struct rpc_timeout xs_tcp_default_timeout = { 2967 .to_initval = 60 * HZ, 2968 .to_maxval = 60 * HZ, 2969 .to_retries = 2, 2970 }; 2971 2972 /** 2973 * xs_setup_tcp - Set up transport to use a TCP socket 2974 * @args: rpc transport creation arguments 2975 * 2976 */ 2977 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2978 { 2979 struct sockaddr *addr = args->dstaddr; 2980 struct rpc_xprt *xprt; 2981 struct sock_xprt *transport; 2982 struct rpc_xprt *ret; 2983 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2984 2985 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2986 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2987 2988 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2989 max_slot_table_size); 2990 if (IS_ERR(xprt)) 2991 return xprt; 2992 transport = container_of(xprt, struct sock_xprt, xprt); 2993 2994 xprt->prot = IPPROTO_TCP; 2995 xprt->xprt_class = &xs_tcp_transport; 2996 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2997 2998 xprt->bind_timeout = XS_BIND_TO; 2999 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3000 xprt->idle_timeout = XS_IDLE_DISC_TO; 3001 3002 xprt->ops = &xs_tcp_ops; 3003 xprt->timeout = &xs_tcp_default_timeout; 3004 3005 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3006 xprt->connect_timeout = xprt->timeout->to_initval * 3007 (xprt->timeout->to_retries + 1); 3008 3009 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 3010 INIT_WORK(&transport->error_worker, xs_error_handle); 3011 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3012 3013 switch (addr->sa_family) { 3014 case AF_INET: 3015 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3016 xprt_set_bound(xprt); 3017 3018 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3019 break; 3020 case AF_INET6: 3021 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3022 xprt_set_bound(xprt); 3023 3024 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3025 break; 3026 default: 3027 ret = ERR_PTR(-EAFNOSUPPORT); 3028 goto out_err; 3029 } 3030 3031 if (xprt_bound(xprt)) 3032 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3033 xprt->address_strings[RPC_DISPLAY_ADDR], 3034 xprt->address_strings[RPC_DISPLAY_PORT], 3035 xprt->address_strings[RPC_DISPLAY_PROTO]); 3036 else 3037 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3038 xprt->address_strings[RPC_DISPLAY_ADDR], 3039 xprt->address_strings[RPC_DISPLAY_PROTO]); 3040 3041 if (try_module_get(THIS_MODULE)) 3042 return xprt; 3043 ret = ERR_PTR(-EINVAL); 3044 out_err: 3045 xs_xprt_free(xprt); 3046 return ret; 3047 } 3048 3049 /** 3050 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3051 * @args: rpc transport creation arguments 3052 * 3053 */ 3054 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3055 { 3056 struct sockaddr *addr = args->dstaddr; 3057 struct rpc_xprt *xprt; 3058 struct sock_xprt *transport; 3059 struct svc_sock *bc_sock; 3060 struct rpc_xprt *ret; 3061 3062 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3063 xprt_tcp_slot_table_entries); 3064 if (IS_ERR(xprt)) 3065 return xprt; 3066 transport = container_of(xprt, struct sock_xprt, xprt); 3067 3068 xprt->prot = IPPROTO_TCP; 3069 xprt->xprt_class = &xs_bc_tcp_transport; 3070 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3071 xprt->timeout = &xs_tcp_default_timeout; 3072 3073 /* backchannel */ 3074 xprt_set_bound(xprt); 3075 xprt->bind_timeout = 0; 3076 xprt->reestablish_timeout = 0; 3077 xprt->idle_timeout = 0; 3078 3079 xprt->ops = &bc_tcp_ops; 3080 3081 switch (addr->sa_family) { 3082 case AF_INET: 3083 xs_format_peer_addresses(xprt, "tcp", 3084 RPCBIND_NETID_TCP); 3085 break; 3086 case AF_INET6: 3087 xs_format_peer_addresses(xprt, "tcp", 3088 RPCBIND_NETID_TCP6); 3089 break; 3090 default: 3091 ret = ERR_PTR(-EAFNOSUPPORT); 3092 goto out_err; 3093 } 3094 3095 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3096 xprt->address_strings[RPC_DISPLAY_ADDR], 3097 xprt->address_strings[RPC_DISPLAY_PORT], 3098 xprt->address_strings[RPC_DISPLAY_PROTO]); 3099 3100 /* 3101 * Once we've associated a backchannel xprt with a connection, 3102 * we want to keep it around as long as the connection lasts, 3103 * in case we need to start using it for a backchannel again; 3104 * this reference won't be dropped until bc_xprt is destroyed. 3105 */ 3106 xprt_get(xprt); 3107 args->bc_xprt->xpt_bc_xprt = xprt; 3108 xprt->bc_xprt = args->bc_xprt; 3109 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3110 transport->sock = bc_sock->sk_sock; 3111 transport->inet = bc_sock->sk_sk; 3112 3113 /* 3114 * Since we don't want connections for the backchannel, we set 3115 * the xprt status to connected 3116 */ 3117 xprt_set_connected(xprt); 3118 3119 if (try_module_get(THIS_MODULE)) 3120 return xprt; 3121 3122 args->bc_xprt->xpt_bc_xprt = NULL; 3123 args->bc_xprt->xpt_bc_xps = NULL; 3124 xprt_put(xprt); 3125 ret = ERR_PTR(-EINVAL); 3126 out_err: 3127 xs_xprt_free(xprt); 3128 return ret; 3129 } 3130 3131 static struct xprt_class xs_local_transport = { 3132 .list = LIST_HEAD_INIT(xs_local_transport.list), 3133 .name = "named UNIX socket", 3134 .owner = THIS_MODULE, 3135 .ident = XPRT_TRANSPORT_LOCAL, 3136 .setup = xs_setup_local, 3137 .netid = { "" }, 3138 }; 3139 3140 static struct xprt_class xs_udp_transport = { 3141 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3142 .name = "udp", 3143 .owner = THIS_MODULE, 3144 .ident = XPRT_TRANSPORT_UDP, 3145 .setup = xs_setup_udp, 3146 .netid = { "udp", "udp6", "" }, 3147 }; 3148 3149 static struct xprt_class xs_tcp_transport = { 3150 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3151 .name = "tcp", 3152 .owner = THIS_MODULE, 3153 .ident = XPRT_TRANSPORT_TCP, 3154 .setup = xs_setup_tcp, 3155 .netid = { "tcp", "tcp6", "" }, 3156 }; 3157 3158 static struct xprt_class xs_bc_tcp_transport = { 3159 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3160 .name = "tcp NFSv4.1 backchannel", 3161 .owner = THIS_MODULE, 3162 .ident = XPRT_TRANSPORT_BC_TCP, 3163 .setup = xs_setup_bc_tcp, 3164 .netid = { "" }, 3165 }; 3166 3167 /** 3168 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3169 * 3170 */ 3171 int init_socket_xprt(void) 3172 { 3173 if (!sunrpc_table_header) 3174 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3175 3176 xprt_register_transport(&xs_local_transport); 3177 xprt_register_transport(&xs_udp_transport); 3178 xprt_register_transport(&xs_tcp_transport); 3179 xprt_register_transport(&xs_bc_tcp_transport); 3180 3181 return 0; 3182 } 3183 3184 /** 3185 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3186 * 3187 */ 3188 void cleanup_socket_xprt(void) 3189 { 3190 if (sunrpc_table_header) { 3191 unregister_sysctl_table(sunrpc_table_header); 3192 sunrpc_table_header = NULL; 3193 } 3194 3195 xprt_unregister_transport(&xs_local_transport); 3196 xprt_unregister_transport(&xs_udp_transport); 3197 xprt_unregister_transport(&xs_tcp_transport); 3198 xprt_unregister_transport(&xs_bc_tcp_transport); 3199 } 3200 3201 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3202 { 3203 return param_set_uint_minmax(val, kp, 3204 RPC_MIN_RESVPORT, 3205 RPC_MAX_RESVPORT); 3206 } 3207 3208 static const struct kernel_param_ops param_ops_portnr = { 3209 .set = param_set_portnr, 3210 .get = param_get_uint, 3211 }; 3212 3213 #define param_check_portnr(name, p) \ 3214 __param_check(name, p, unsigned int); 3215 3216 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3217 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3218 3219 static int param_set_slot_table_size(const char *val, 3220 const struct kernel_param *kp) 3221 { 3222 return param_set_uint_minmax(val, kp, 3223 RPC_MIN_SLOT_TABLE, 3224 RPC_MAX_SLOT_TABLE); 3225 } 3226 3227 static const struct kernel_param_ops param_ops_slot_table_size = { 3228 .set = param_set_slot_table_size, 3229 .get = param_get_uint, 3230 }; 3231 3232 #define param_check_slot_table_size(name, p) \ 3233 __param_check(name, p, unsigned int); 3234 3235 static int param_set_max_slot_table_size(const char *val, 3236 const struct kernel_param *kp) 3237 { 3238 return param_set_uint_minmax(val, kp, 3239 RPC_MIN_SLOT_TABLE, 3240 RPC_MAX_SLOT_TABLE_LIMIT); 3241 } 3242 3243 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3244 .set = param_set_max_slot_table_size, 3245 .get = param_get_uint, 3246 }; 3247 3248 #define param_check_max_slot_table_size(name, p) \ 3249 __param_check(name, p, unsigned int); 3250 3251 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3252 slot_table_size, 0644); 3253 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3254 max_slot_table_size, 0644); 3255 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3256 slot_table_size, 0644); 3257