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 "sunrpc.h" 58 59 static void xs_close(struct rpc_xprt *xprt); 60 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 61 struct socket *sock); 62 63 /* 64 * xprtsock tunables 65 */ 66 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 67 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 68 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 69 70 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 71 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 72 73 #define XS_TCP_LINGER_TO (15U * HZ) 74 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 75 76 /* 77 * We can register our own files under /proc/sys/sunrpc by 78 * calling register_sysctl_table() again. The files in that 79 * directory become the union of all files registered there. 80 * 81 * We simply need to make sure that we don't collide with 82 * someone else's file names! 83 */ 84 85 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 86 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 87 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 88 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 89 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 90 91 static struct ctl_table_header *sunrpc_table_header; 92 93 /* 94 * FIXME: changing the UDP slot table size should also resize the UDP 95 * socket buffers for existing UDP transports 96 */ 97 static struct ctl_table xs_tunables_table[] = { 98 { 99 .procname = "udp_slot_table_entries", 100 .data = &xprt_udp_slot_table_entries, 101 .maxlen = sizeof(unsigned int), 102 .mode = 0644, 103 .proc_handler = proc_dointvec_minmax, 104 .extra1 = &min_slot_table_size, 105 .extra2 = &max_slot_table_size 106 }, 107 { 108 .procname = "tcp_slot_table_entries", 109 .data = &xprt_tcp_slot_table_entries, 110 .maxlen = sizeof(unsigned int), 111 .mode = 0644, 112 .proc_handler = proc_dointvec_minmax, 113 .extra1 = &min_slot_table_size, 114 .extra2 = &max_slot_table_size 115 }, 116 { 117 .procname = "tcp_max_slot_table_entries", 118 .data = &xprt_max_tcp_slot_table_entries, 119 .maxlen = sizeof(unsigned int), 120 .mode = 0644, 121 .proc_handler = proc_dointvec_minmax, 122 .extra1 = &min_slot_table_size, 123 .extra2 = &max_tcp_slot_table_limit 124 }, 125 { 126 .procname = "min_resvport", 127 .data = &xprt_min_resvport, 128 .maxlen = sizeof(unsigned int), 129 .mode = 0644, 130 .proc_handler = proc_dointvec_minmax, 131 .extra1 = &xprt_min_resvport_limit, 132 .extra2 = &xprt_max_resvport_limit 133 }, 134 { 135 .procname = "max_resvport", 136 .data = &xprt_max_resvport, 137 .maxlen = sizeof(unsigned int), 138 .mode = 0644, 139 .proc_handler = proc_dointvec_minmax, 140 .extra1 = &xprt_min_resvport_limit, 141 .extra2 = &xprt_max_resvport_limit 142 }, 143 { 144 .procname = "tcp_fin_timeout", 145 .data = &xs_tcp_fin_timeout, 146 .maxlen = sizeof(xs_tcp_fin_timeout), 147 .mode = 0644, 148 .proc_handler = proc_dointvec_jiffies, 149 }, 150 { }, 151 }; 152 153 static struct ctl_table sunrpc_table[] = { 154 { 155 .procname = "sunrpc", 156 .mode = 0555, 157 .child = xs_tunables_table 158 }, 159 { }, 160 }; 161 162 /* 163 * Wait duration for a reply from the RPC portmapper. 164 */ 165 #define XS_BIND_TO (60U * HZ) 166 167 /* 168 * Delay if a UDP socket connect error occurs. This is most likely some 169 * kind of resource problem on the local host. 170 */ 171 #define XS_UDP_REEST_TO (2U * HZ) 172 173 /* 174 * The reestablish timeout allows clients to delay for a bit before attempting 175 * to reconnect to a server that just dropped our connection. 176 * 177 * We implement an exponential backoff when trying to reestablish a TCP 178 * transport connection with the server. Some servers like to drop a TCP 179 * connection when they are overworked, so we start with a short timeout and 180 * increase over time if the server is down or not responding. 181 */ 182 #define XS_TCP_INIT_REEST_TO (3U * HZ) 183 184 /* 185 * TCP idle timeout; client drops the transport socket if it is idle 186 * for this long. Note that we also timeout UDP sockets to prevent 187 * holding port numbers when there is no RPC traffic. 188 */ 189 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 190 191 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 192 # undef RPC_DEBUG_DATA 193 # define RPCDBG_FACILITY RPCDBG_TRANS 194 #endif 195 196 #ifdef RPC_DEBUG_DATA 197 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 198 { 199 u8 *buf = (u8 *) packet; 200 int j; 201 202 dprintk("RPC: %s\n", msg); 203 for (j = 0; j < count && j < 128; j += 4) { 204 if (!(j & 31)) { 205 if (j) 206 dprintk("\n"); 207 dprintk("0x%04x ", j); 208 } 209 dprintk("%02x%02x%02x%02x ", 210 buf[j], buf[j+1], buf[j+2], buf[j+3]); 211 } 212 dprintk("\n"); 213 } 214 #else 215 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 216 { 217 /* NOP */ 218 } 219 #endif 220 221 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 222 { 223 return (struct rpc_xprt *) sk->sk_user_data; 224 } 225 226 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 227 { 228 return (struct sockaddr *) &xprt->addr; 229 } 230 231 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 232 { 233 return (struct sockaddr_un *) &xprt->addr; 234 } 235 236 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 237 { 238 return (struct sockaddr_in *) &xprt->addr; 239 } 240 241 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 242 { 243 return (struct sockaddr_in6 *) &xprt->addr; 244 } 245 246 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 247 { 248 struct sockaddr *sap = xs_addr(xprt); 249 struct sockaddr_in6 *sin6; 250 struct sockaddr_in *sin; 251 struct sockaddr_un *sun; 252 char buf[128]; 253 254 switch (sap->sa_family) { 255 case AF_LOCAL: 256 sun = xs_addr_un(xprt); 257 strlcpy(buf, sun->sun_path, sizeof(buf)); 258 xprt->address_strings[RPC_DISPLAY_ADDR] = 259 kstrdup(buf, GFP_KERNEL); 260 break; 261 case AF_INET: 262 (void)rpc_ntop(sap, buf, sizeof(buf)); 263 xprt->address_strings[RPC_DISPLAY_ADDR] = 264 kstrdup(buf, GFP_KERNEL); 265 sin = xs_addr_in(xprt); 266 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 267 break; 268 case AF_INET6: 269 (void)rpc_ntop(sap, buf, sizeof(buf)); 270 xprt->address_strings[RPC_DISPLAY_ADDR] = 271 kstrdup(buf, GFP_KERNEL); 272 sin6 = xs_addr_in6(xprt); 273 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 274 break; 275 default: 276 BUG(); 277 } 278 279 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 280 } 281 282 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 283 { 284 struct sockaddr *sap = xs_addr(xprt); 285 char buf[128]; 286 287 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 288 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 289 290 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 291 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 292 } 293 294 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 295 const char *protocol, 296 const char *netid) 297 { 298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 299 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 300 xs_format_common_peer_addresses(xprt); 301 xs_format_common_peer_ports(xprt); 302 } 303 304 static void xs_update_peer_port(struct rpc_xprt *xprt) 305 { 306 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 307 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 308 309 xs_format_common_peer_ports(xprt); 310 } 311 312 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 313 { 314 unsigned int i; 315 316 for (i = 0; i < RPC_DISPLAY_MAX; i++) 317 switch (i) { 318 case RPC_DISPLAY_PROTO: 319 case RPC_DISPLAY_NETID: 320 continue; 321 default: 322 kfree(xprt->address_strings[i]); 323 } 324 } 325 326 static size_t 327 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) 328 { 329 size_t i,n; 330 331 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) 332 return want; 333 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; 334 for (i = 0; i < n; i++) { 335 if (buf->pages[i]) 336 continue; 337 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); 338 if (!buf->pages[i]) { 339 i *= PAGE_SIZE; 340 return i > buf->page_base ? i - buf->page_base : 0; 341 } 342 } 343 return want; 344 } 345 346 static ssize_t 347 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) 348 { 349 ssize_t ret; 350 if (seek != 0) 351 iov_iter_advance(&msg->msg_iter, seek); 352 ret = sock_recvmsg(sock, msg, flags); 353 return ret > 0 ? ret + seek : ret; 354 } 355 356 static ssize_t 357 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, 358 struct kvec *kvec, size_t count, size_t seek) 359 { 360 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); 361 return xs_sock_recvmsg(sock, msg, flags, seek); 362 } 363 364 static ssize_t 365 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, 366 struct bio_vec *bvec, unsigned long nr, size_t count, 367 size_t seek) 368 { 369 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); 370 return xs_sock_recvmsg(sock, msg, flags, seek); 371 } 372 373 static ssize_t 374 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, 375 size_t count) 376 { 377 iov_iter_discard(&msg->msg_iter, READ, count); 378 return sock_recvmsg(sock, msg, flags); 379 } 380 381 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 382 static void 383 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 384 { 385 struct bvec_iter bi = { 386 .bi_size = count, 387 }; 388 struct bio_vec bv; 389 390 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); 391 for_each_bvec(bv, bvec, bi, bi) 392 flush_dcache_page(bv.bv_page); 393 } 394 #else 395 static inline void 396 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 397 { 398 } 399 #endif 400 401 static ssize_t 402 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, 403 struct xdr_buf *buf, size_t count, size_t seek, size_t *read) 404 { 405 size_t want, seek_init = seek, offset = 0; 406 ssize_t ret; 407 408 want = min_t(size_t, count, buf->head[0].iov_len); 409 if (seek < want) { 410 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); 411 if (ret <= 0) 412 goto sock_err; 413 offset += ret; 414 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 415 goto out; 416 if (ret != want) 417 goto out; 418 seek = 0; 419 } else { 420 seek -= want; 421 offset += want; 422 } 423 424 want = xs_alloc_sparse_pages(buf, 425 min_t(size_t, count - offset, buf->page_len), 426 GFP_KERNEL); 427 if (seek < want) { 428 ret = xs_read_bvec(sock, msg, flags, buf->bvec, 429 xdr_buf_pagecount(buf), 430 want + buf->page_base, 431 seek + buf->page_base); 432 if (ret <= 0) 433 goto sock_err; 434 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); 435 offset += ret - buf->page_base; 436 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 437 goto out; 438 if (ret != want) 439 goto out; 440 seek = 0; 441 } else { 442 seek -= want; 443 offset += want; 444 } 445 446 want = min_t(size_t, count - offset, buf->tail[0].iov_len); 447 if (seek < want) { 448 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); 449 if (ret <= 0) 450 goto sock_err; 451 offset += ret; 452 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 453 goto out; 454 if (ret != want) 455 goto out; 456 } else if (offset < seek_init) 457 offset = seek_init; 458 ret = -EMSGSIZE; 459 out: 460 *read = offset - seek_init; 461 return ret; 462 sock_err: 463 offset += seek; 464 goto out; 465 } 466 467 static void 468 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) 469 { 470 if (!transport->recv.copied) { 471 if (buf->head[0].iov_len >= transport->recv.offset) 472 memcpy(buf->head[0].iov_base, 473 &transport->recv.xid, 474 transport->recv.offset); 475 transport->recv.copied = transport->recv.offset; 476 } 477 } 478 479 static bool 480 xs_read_stream_request_done(struct sock_xprt *transport) 481 { 482 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); 483 } 484 485 static void 486 xs_read_stream_check_eor(struct sock_xprt *transport, 487 struct msghdr *msg) 488 { 489 if (xs_read_stream_request_done(transport)) 490 msg->msg_flags |= MSG_EOR; 491 } 492 493 static ssize_t 494 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, 495 int flags, struct rpc_rqst *req) 496 { 497 struct xdr_buf *buf = &req->rq_private_buf; 498 size_t want, read; 499 ssize_t ret; 500 501 xs_read_header(transport, buf); 502 503 want = transport->recv.len - transport->recv.offset; 504 if (want != 0) { 505 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, 506 transport->recv.copied + want, 507 transport->recv.copied, 508 &read); 509 transport->recv.offset += read; 510 transport->recv.copied += read; 511 } 512 513 if (transport->recv.offset == transport->recv.len) 514 xs_read_stream_check_eor(transport, msg); 515 516 if (want == 0) 517 return 0; 518 519 switch (ret) { 520 default: 521 break; 522 case -EFAULT: 523 case -EMSGSIZE: 524 msg->msg_flags |= MSG_TRUNC; 525 return read; 526 case 0: 527 return -ESHUTDOWN; 528 } 529 return ret < 0 ? ret : read; 530 } 531 532 static size_t 533 xs_read_stream_headersize(bool isfrag) 534 { 535 if (isfrag) 536 return sizeof(__be32); 537 return 3 * sizeof(__be32); 538 } 539 540 static ssize_t 541 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, 542 int flags, size_t want, size_t seek) 543 { 544 struct kvec kvec = { 545 .iov_base = &transport->recv.fraghdr, 546 .iov_len = want, 547 }; 548 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); 549 } 550 551 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 552 static ssize_t 553 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 554 { 555 struct rpc_xprt *xprt = &transport->xprt; 556 struct rpc_rqst *req; 557 ssize_t ret; 558 559 /* Look up and lock the request corresponding to the given XID */ 560 req = xprt_lookup_bc_request(xprt, transport->recv.xid); 561 if (!req) { 562 printk(KERN_WARNING "Callback slot table overflowed\n"); 563 return -ESHUTDOWN; 564 } 565 566 ret = xs_read_stream_request(transport, msg, flags, req); 567 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 568 xprt_complete_bc_request(req, transport->recv.copied); 569 570 return ret; 571 } 572 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 573 static ssize_t 574 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 575 { 576 return -ESHUTDOWN; 577 } 578 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 579 580 static ssize_t 581 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) 582 { 583 struct rpc_xprt *xprt = &transport->xprt; 584 struct rpc_rqst *req; 585 ssize_t ret = 0; 586 587 /* Look up and lock the request corresponding to the given XID */ 588 spin_lock(&xprt->queue_lock); 589 req = xprt_lookup_rqst(xprt, transport->recv.xid); 590 if (!req) { 591 msg->msg_flags |= MSG_TRUNC; 592 goto out; 593 } 594 xprt_pin_rqst(req); 595 spin_unlock(&xprt->queue_lock); 596 597 ret = xs_read_stream_request(transport, msg, flags, req); 598 599 spin_lock(&xprt->queue_lock); 600 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 601 xprt_complete_rqst(req->rq_task, transport->recv.copied); 602 xprt_unpin_rqst(req); 603 out: 604 spin_unlock(&xprt->queue_lock); 605 return ret; 606 } 607 608 static ssize_t 609 xs_read_stream(struct sock_xprt *transport, int flags) 610 { 611 struct msghdr msg = { 0 }; 612 size_t want, read = 0; 613 ssize_t ret = 0; 614 615 if (transport->recv.len == 0) { 616 want = xs_read_stream_headersize(transport->recv.copied != 0); 617 ret = xs_read_stream_header(transport, &msg, flags, want, 618 transport->recv.offset); 619 if (ret <= 0) 620 goto out_err; 621 transport->recv.offset = ret; 622 if (transport->recv.offset != want) 623 return transport->recv.offset; 624 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & 625 RPC_FRAGMENT_SIZE_MASK; 626 transport->recv.offset -= sizeof(transport->recv.fraghdr); 627 read = ret; 628 } 629 630 switch (be32_to_cpu(transport->recv.calldir)) { 631 default: 632 msg.msg_flags |= MSG_TRUNC; 633 break; 634 case RPC_CALL: 635 ret = xs_read_stream_call(transport, &msg, flags); 636 break; 637 case RPC_REPLY: 638 ret = xs_read_stream_reply(transport, &msg, flags); 639 } 640 if (msg.msg_flags & MSG_TRUNC) { 641 transport->recv.calldir = cpu_to_be32(-1); 642 transport->recv.copied = -1; 643 } 644 if (ret < 0) 645 goto out_err; 646 read += ret; 647 if (transport->recv.offset < transport->recv.len) { 648 if (!(msg.msg_flags & MSG_TRUNC)) 649 return read; 650 msg.msg_flags = 0; 651 ret = xs_read_discard(transport->sock, &msg, flags, 652 transport->recv.len - transport->recv.offset); 653 if (ret <= 0) 654 goto out_err; 655 transport->recv.offset += ret; 656 read += ret; 657 if (transport->recv.offset != transport->recv.len) 658 return read; 659 } 660 if (xs_read_stream_request_done(transport)) { 661 trace_xs_stream_read_request(transport); 662 transport->recv.copied = 0; 663 } 664 transport->recv.offset = 0; 665 transport->recv.len = 0; 666 return read; 667 out_err: 668 return ret != 0 ? ret : -ESHUTDOWN; 669 } 670 671 static __poll_t xs_poll_socket(struct sock_xprt *transport) 672 { 673 return transport->sock->ops->poll(transport->file, transport->sock, 674 NULL); 675 } 676 677 static bool xs_poll_socket_readable(struct sock_xprt *transport) 678 { 679 __poll_t events = xs_poll_socket(transport); 680 681 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); 682 } 683 684 static void xs_poll_check_readable(struct sock_xprt *transport) 685 { 686 687 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 688 if (!xs_poll_socket_readable(transport)) 689 return; 690 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 691 queue_work(xprtiod_workqueue, &transport->recv_worker); 692 } 693 694 static void xs_stream_data_receive(struct sock_xprt *transport) 695 { 696 size_t read = 0; 697 ssize_t ret = 0; 698 699 mutex_lock(&transport->recv_mutex); 700 if (transport->sock == NULL) 701 goto out; 702 for (;;) { 703 ret = xs_read_stream(transport, MSG_DONTWAIT); 704 if (ret < 0) 705 break; 706 read += ret; 707 cond_resched(); 708 } 709 if (ret == -ESHUTDOWN) 710 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 711 else 712 xs_poll_check_readable(transport); 713 out: 714 mutex_unlock(&transport->recv_mutex); 715 trace_xs_stream_read_data(&transport->xprt, ret, read); 716 } 717 718 static void xs_stream_data_receive_workfn(struct work_struct *work) 719 { 720 struct sock_xprt *transport = 721 container_of(work, struct sock_xprt, recv_worker); 722 unsigned int pflags = memalloc_nofs_save(); 723 724 xs_stream_data_receive(transport); 725 memalloc_nofs_restore(pflags); 726 } 727 728 static void 729 xs_stream_reset_connect(struct sock_xprt *transport) 730 { 731 transport->recv.offset = 0; 732 transport->recv.len = 0; 733 transport->recv.copied = 0; 734 transport->xmit.offset = 0; 735 } 736 737 static void 738 xs_stream_start_connect(struct sock_xprt *transport) 739 { 740 transport->xprt.stat.connect_count++; 741 transport->xprt.stat.connect_start = jiffies; 742 } 743 744 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 745 746 static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek) 747 { 748 if (seek) 749 iov_iter_advance(&msg->msg_iter, seek); 750 return sock_sendmsg(sock, msg); 751 } 752 753 static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek) 754 { 755 iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len); 756 return xs_sendmsg(sock, msg, seek); 757 } 758 759 static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base) 760 { 761 int err; 762 763 err = xdr_alloc_bvec(xdr, GFP_KERNEL); 764 if (err < 0) 765 return err; 766 767 iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, 768 xdr_buf_pagecount(xdr), 769 xdr->page_len + xdr->page_base); 770 return xs_sendmsg(sock, msg, base + xdr->page_base); 771 } 772 773 #define xs_record_marker_len() sizeof(rpc_fraghdr) 774 775 /* Common case: 776 * - stream transport 777 * - sending from byte 0 of the message 778 * - the message is wholly contained in @xdr's head iovec 779 */ 780 static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg, 781 rpc_fraghdr marker, struct kvec *vec, size_t base) 782 { 783 struct kvec iov[2] = { 784 [0] = { 785 .iov_base = &marker, 786 .iov_len = sizeof(marker) 787 }, 788 [1] = *vec, 789 }; 790 size_t len = iov[0].iov_len + iov[1].iov_len; 791 792 iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len); 793 return xs_sendmsg(sock, msg, base); 794 } 795 796 /** 797 * xs_sendpages - write pages directly to a socket 798 * @sock: socket to send on 799 * @addr: UDP only -- address of destination 800 * @addrlen: UDP only -- length of destination address 801 * @xdr: buffer containing this request 802 * @base: starting position in the buffer 803 * @rm: stream record marker field 804 * @sent_p: return the total number of bytes successfully queued for sending 805 * 806 */ 807 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p) 808 { 809 struct msghdr msg = { 810 .msg_name = addr, 811 .msg_namelen = addrlen, 812 .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE, 813 }; 814 unsigned int rmsize = rm ? sizeof(rm) : 0; 815 unsigned int remainder = rmsize + xdr->len - base; 816 unsigned int want; 817 int err = 0; 818 819 if (unlikely(!sock)) 820 return -ENOTSOCK; 821 822 want = xdr->head[0].iov_len + rmsize; 823 if (base < want) { 824 unsigned int len = want - base; 825 remainder -= len; 826 if (remainder == 0) 827 msg.msg_flags &= ~MSG_MORE; 828 if (rmsize) 829 err = xs_send_rm_and_kvec(sock, &msg, rm, 830 &xdr->head[0], base); 831 else 832 err = xs_send_kvec(sock, &msg, &xdr->head[0], base); 833 if (remainder == 0 || err != len) 834 goto out; 835 *sent_p += err; 836 base = 0; 837 } else 838 base -= want; 839 840 if (base < xdr->page_len) { 841 unsigned int len = xdr->page_len - base; 842 remainder -= len; 843 if (remainder == 0) 844 msg.msg_flags &= ~MSG_MORE; 845 err = xs_send_pagedata(sock, &msg, xdr, base); 846 if (remainder == 0 || err != len) 847 goto out; 848 *sent_p += err; 849 base = 0; 850 } else 851 base -= xdr->page_len; 852 853 if (base >= xdr->tail[0].iov_len) 854 return 0; 855 msg.msg_flags &= ~MSG_MORE; 856 err = xs_send_kvec(sock, &msg, &xdr->tail[0], base); 857 out: 858 if (err > 0) { 859 *sent_p += err; 860 err = 0; 861 } 862 return err; 863 } 864 865 /** 866 * xs_nospace - handle transmit was incomplete 867 * @req: pointer to RPC request 868 * 869 */ 870 static int xs_nospace(struct rpc_rqst *req) 871 { 872 struct rpc_xprt *xprt = req->rq_xprt; 873 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 874 struct sock *sk = transport->inet; 875 int ret = -EAGAIN; 876 877 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 878 req->rq_task->tk_pid, 879 req->rq_slen - transport->xmit.offset, 880 req->rq_slen); 881 882 /* Protect against races with write_space */ 883 spin_lock_bh(&xprt->transport_lock); 884 885 /* Don't race with disconnect */ 886 if (xprt_connected(xprt)) { 887 /* wait for more buffer space */ 888 sk->sk_write_pending++; 889 xprt_wait_for_buffer_space(xprt); 890 } else 891 ret = -ENOTCONN; 892 893 spin_unlock_bh(&xprt->transport_lock); 894 895 /* Race breaker in case memory is freed before above code is called */ 896 if (ret == -EAGAIN) { 897 struct socket_wq *wq; 898 899 rcu_read_lock(); 900 wq = rcu_dereference(sk->sk_wq); 901 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); 902 rcu_read_unlock(); 903 904 sk->sk_write_space(sk); 905 } 906 return ret; 907 } 908 909 static void 910 xs_stream_prepare_request(struct rpc_rqst *req) 911 { 912 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL); 913 } 914 915 /* 916 * Determine if the previous message in the stream was aborted before it 917 * could complete transmission. 918 */ 919 static bool 920 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) 921 { 922 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; 923 } 924 925 /* 926 * Return the stream record marker field for a record of length < 2^31-1 927 */ 928 static rpc_fraghdr 929 xs_stream_record_marker(struct xdr_buf *xdr) 930 { 931 if (!xdr->len) 932 return 0; 933 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); 934 } 935 936 /** 937 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 938 * @req: pointer to RPC request 939 * 940 * Return values: 941 * 0: The request has been sent 942 * EAGAIN: The socket was blocked, please call again later to 943 * complete the request 944 * ENOTCONN: Caller needs to invoke connect logic then call again 945 * other: Some other error occured, the request was not sent 946 */ 947 static int xs_local_send_request(struct rpc_rqst *req) 948 { 949 struct rpc_xprt *xprt = req->rq_xprt; 950 struct sock_xprt *transport = 951 container_of(xprt, struct sock_xprt, xprt); 952 struct xdr_buf *xdr = &req->rq_snd_buf; 953 int status; 954 int sent = 0; 955 956 /* Close the stream if the previous transmission was incomplete */ 957 if (xs_send_request_was_aborted(transport, req)) { 958 xs_close(xprt); 959 return -ENOTCONN; 960 } 961 962 xs_pktdump("packet data:", 963 req->rq_svec->iov_base, req->rq_svec->iov_len); 964 965 req->rq_xtime = ktime_get(); 966 status = xs_sendpages(transport->sock, NULL, 0, xdr, 967 transport->xmit.offset, 968 xs_stream_record_marker(xdr), 969 &sent); 970 dprintk("RPC: %s(%u) = %d\n", 971 __func__, xdr->len - transport->xmit.offset, status); 972 973 if (status == -EAGAIN && sock_writeable(transport->inet)) 974 status = -ENOBUFS; 975 976 if (likely(sent > 0) || status == 0) { 977 transport->xmit.offset += sent; 978 req->rq_bytes_sent = transport->xmit.offset; 979 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 980 req->rq_xmit_bytes_sent += transport->xmit.offset; 981 transport->xmit.offset = 0; 982 return 0; 983 } 984 status = -EAGAIN; 985 } 986 987 switch (status) { 988 case -ENOBUFS: 989 break; 990 case -EAGAIN: 991 status = xs_nospace(req); 992 break; 993 default: 994 dprintk("RPC: sendmsg returned unrecognized error %d\n", 995 -status); 996 /* fall through */ 997 case -EPIPE: 998 xs_close(xprt); 999 status = -ENOTCONN; 1000 } 1001 1002 return status; 1003 } 1004 1005 /** 1006 * xs_udp_send_request - write an RPC request to a UDP 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 static int xs_udp_send_request(struct rpc_rqst *req) 1017 { 1018 struct rpc_xprt *xprt = req->rq_xprt; 1019 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1020 struct xdr_buf *xdr = &req->rq_snd_buf; 1021 int sent = 0; 1022 int status; 1023 1024 xs_pktdump("packet data:", 1025 req->rq_svec->iov_base, 1026 req->rq_svec->iov_len); 1027 1028 if (!xprt_bound(xprt)) 1029 return -ENOTCONN; 1030 1031 if (!xprt_request_get_cong(xprt, req)) 1032 return -EBADSLT; 1033 1034 req->rq_xtime = ktime_get(); 1035 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 1036 xdr, 0, 0, &sent); 1037 1038 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 1039 xdr->len, status); 1040 1041 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 1042 if (status == -EPERM) 1043 goto process_status; 1044 1045 if (status == -EAGAIN && sock_writeable(transport->inet)) 1046 status = -ENOBUFS; 1047 1048 if (sent > 0 || status == 0) { 1049 req->rq_xmit_bytes_sent += sent; 1050 if (sent >= req->rq_slen) 1051 return 0; 1052 /* Still some bytes left; set up for a retry later. */ 1053 status = -EAGAIN; 1054 } 1055 1056 process_status: 1057 switch (status) { 1058 case -ENOTSOCK: 1059 status = -ENOTCONN; 1060 /* Should we call xs_close() here? */ 1061 break; 1062 case -EAGAIN: 1063 status = xs_nospace(req); 1064 break; 1065 case -ENETUNREACH: 1066 case -ENOBUFS: 1067 case -EPIPE: 1068 case -ECONNREFUSED: 1069 case -EPERM: 1070 /* When the server has died, an ICMP port unreachable message 1071 * prompts ECONNREFUSED. */ 1072 break; 1073 default: 1074 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1075 -status); 1076 } 1077 1078 return status; 1079 } 1080 1081 /** 1082 * xs_tcp_send_request - write an RPC request to a TCP socket 1083 * @req: pointer to RPC request 1084 * 1085 * Return values: 1086 * 0: The request has been sent 1087 * EAGAIN: The socket was blocked, please call again later to 1088 * complete the request 1089 * ENOTCONN: Caller needs to invoke connect logic then call again 1090 * other: Some other error occurred, the request was not sent 1091 * 1092 * XXX: In the case of soft timeouts, should we eventually give up 1093 * if sendmsg is not able to make progress? 1094 */ 1095 static int xs_tcp_send_request(struct rpc_rqst *req) 1096 { 1097 struct rpc_xprt *xprt = req->rq_xprt; 1098 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1099 struct xdr_buf *xdr = &req->rq_snd_buf; 1100 bool vm_wait = false; 1101 int status; 1102 int sent; 1103 1104 /* Close the stream if the previous transmission was incomplete */ 1105 if (xs_send_request_was_aborted(transport, req)) { 1106 if (transport->sock != NULL) 1107 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 1108 return -ENOTCONN; 1109 } 1110 1111 xs_pktdump("packet data:", 1112 req->rq_svec->iov_base, 1113 req->rq_svec->iov_len); 1114 1115 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 1116 xs_tcp_set_socket_timeouts(xprt, transport->sock); 1117 1118 /* Continue transmitting the packet/record. We must be careful 1119 * to cope with writespace callbacks arriving _after_ we have 1120 * called sendmsg(). */ 1121 req->rq_xtime = ktime_get(); 1122 while (1) { 1123 sent = 0; 1124 status = xs_sendpages(transport->sock, NULL, 0, xdr, 1125 transport->xmit.offset, 1126 xs_stream_record_marker(xdr), 1127 &sent); 1128 1129 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 1130 xdr->len - transport->xmit.offset, status); 1131 1132 /* If we've sent the entire packet, immediately 1133 * reset the count of bytes sent. */ 1134 transport->xmit.offset += sent; 1135 req->rq_bytes_sent = transport->xmit.offset; 1136 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 1137 req->rq_xmit_bytes_sent += transport->xmit.offset; 1138 transport->xmit.offset = 0; 1139 return 0; 1140 } 1141 1142 WARN_ON_ONCE(sent == 0 && status == 0); 1143 1144 if (status == -EAGAIN ) { 1145 /* 1146 * Return EAGAIN if we're sure we're hitting the 1147 * socket send buffer limits. 1148 */ 1149 if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 1150 break; 1151 /* 1152 * Did we hit a memory allocation failure? 1153 */ 1154 if (sent == 0) { 1155 status = -ENOBUFS; 1156 if (vm_wait) 1157 break; 1158 /* Retry, knowing now that we're below the 1159 * socket send buffer limit 1160 */ 1161 vm_wait = true; 1162 } 1163 continue; 1164 } 1165 if (status < 0) 1166 break; 1167 vm_wait = false; 1168 } 1169 1170 switch (status) { 1171 case -ENOTSOCK: 1172 status = -ENOTCONN; 1173 /* Should we call xs_close() here? */ 1174 break; 1175 case -EAGAIN: 1176 status = xs_nospace(req); 1177 break; 1178 case -ECONNRESET: 1179 case -ECONNREFUSED: 1180 case -ENOTCONN: 1181 case -EADDRINUSE: 1182 case -ENOBUFS: 1183 case -EPIPE: 1184 break; 1185 default: 1186 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1187 -status); 1188 } 1189 1190 return status; 1191 } 1192 1193 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1194 { 1195 transport->old_data_ready = sk->sk_data_ready; 1196 transport->old_state_change = sk->sk_state_change; 1197 transport->old_write_space = sk->sk_write_space; 1198 transport->old_error_report = sk->sk_error_report; 1199 } 1200 1201 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1202 { 1203 sk->sk_data_ready = transport->old_data_ready; 1204 sk->sk_state_change = transport->old_state_change; 1205 sk->sk_write_space = transport->old_write_space; 1206 sk->sk_error_report = transport->old_error_report; 1207 } 1208 1209 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 1210 { 1211 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1212 1213 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1214 } 1215 1216 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1217 { 1218 smp_mb__before_atomic(); 1219 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1220 clear_bit(XPRT_CLOSING, &xprt->state); 1221 xs_sock_reset_state_flags(xprt); 1222 smp_mb__after_atomic(); 1223 } 1224 1225 /** 1226 * xs_error_report - callback to handle TCP socket state errors 1227 * @sk: socket 1228 * 1229 * Note: we don't call sock_error() since there may be a rpc_task 1230 * using the socket, and so we don't want to clear sk->sk_err. 1231 */ 1232 static void xs_error_report(struct sock *sk) 1233 { 1234 struct rpc_xprt *xprt; 1235 int err; 1236 1237 read_lock_bh(&sk->sk_callback_lock); 1238 if (!(xprt = xprt_from_sock(sk))) 1239 goto out; 1240 1241 err = -sk->sk_err; 1242 if (err == 0) 1243 goto out; 1244 dprintk("RPC: xs_error_report client %p, error=%d...\n", 1245 xprt, -err); 1246 trace_rpc_socket_error(xprt, sk->sk_socket, err); 1247 xprt_wake_pending_tasks(xprt, err); 1248 out: 1249 read_unlock_bh(&sk->sk_callback_lock); 1250 } 1251 1252 static void xs_reset_transport(struct sock_xprt *transport) 1253 { 1254 struct socket *sock = transport->sock; 1255 struct sock *sk = transport->inet; 1256 struct rpc_xprt *xprt = &transport->xprt; 1257 struct file *filp = transport->file; 1258 1259 if (sk == NULL) 1260 return; 1261 1262 if (atomic_read(&transport->xprt.swapper)) 1263 sk_clear_memalloc(sk); 1264 1265 kernel_sock_shutdown(sock, SHUT_RDWR); 1266 1267 mutex_lock(&transport->recv_mutex); 1268 write_lock_bh(&sk->sk_callback_lock); 1269 transport->inet = NULL; 1270 transport->sock = NULL; 1271 transport->file = NULL; 1272 1273 sk->sk_user_data = NULL; 1274 1275 xs_restore_old_callbacks(transport, sk); 1276 xprt_clear_connected(xprt); 1277 write_unlock_bh(&sk->sk_callback_lock); 1278 xs_sock_reset_connection_flags(xprt); 1279 /* Reset stream record info */ 1280 xs_stream_reset_connect(transport); 1281 mutex_unlock(&transport->recv_mutex); 1282 1283 trace_rpc_socket_close(xprt, sock); 1284 fput(filp); 1285 1286 xprt_disconnect_done(xprt); 1287 } 1288 1289 /** 1290 * xs_close - close a socket 1291 * @xprt: transport 1292 * 1293 * This is used when all requests are complete; ie, no DRC state remains 1294 * on the server we want to save. 1295 * 1296 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 1297 * xs_reset_transport() zeroing the socket from underneath a writer. 1298 */ 1299 static void xs_close(struct rpc_xprt *xprt) 1300 { 1301 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1302 1303 dprintk("RPC: xs_close xprt %p\n", xprt); 1304 1305 xs_reset_transport(transport); 1306 xprt->reestablish_timeout = 0; 1307 } 1308 1309 static void xs_inject_disconnect(struct rpc_xprt *xprt) 1310 { 1311 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 1312 xprt); 1313 xprt_disconnect_done(xprt); 1314 } 1315 1316 static void xs_xprt_free(struct rpc_xprt *xprt) 1317 { 1318 xs_free_peer_addresses(xprt); 1319 xprt_free(xprt); 1320 } 1321 1322 /** 1323 * xs_destroy - prepare to shutdown a transport 1324 * @xprt: doomed transport 1325 * 1326 */ 1327 static void xs_destroy(struct rpc_xprt *xprt) 1328 { 1329 struct sock_xprt *transport = container_of(xprt, 1330 struct sock_xprt, xprt); 1331 dprintk("RPC: xs_destroy xprt %p\n", xprt); 1332 1333 cancel_delayed_work_sync(&transport->connect_worker); 1334 xs_close(xprt); 1335 cancel_work_sync(&transport->recv_worker); 1336 xs_xprt_free(xprt); 1337 module_put(THIS_MODULE); 1338 } 1339 1340 /** 1341 * xs_udp_data_read_skb - receive callback for UDP sockets 1342 * @xprt: transport 1343 * @sk: socket 1344 * @skb: skbuff 1345 * 1346 */ 1347 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1348 struct sock *sk, 1349 struct sk_buff *skb) 1350 { 1351 struct rpc_task *task; 1352 struct rpc_rqst *rovr; 1353 int repsize, copied; 1354 u32 _xid; 1355 __be32 *xp; 1356 1357 repsize = skb->len; 1358 if (repsize < 4) { 1359 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1360 return; 1361 } 1362 1363 /* Copy the XID from the skb... */ 1364 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1365 if (xp == NULL) 1366 return; 1367 1368 /* Look up and lock the request corresponding to the given XID */ 1369 spin_lock(&xprt->queue_lock); 1370 rovr = xprt_lookup_rqst(xprt, *xp); 1371 if (!rovr) 1372 goto out_unlock; 1373 xprt_pin_rqst(rovr); 1374 xprt_update_rtt(rovr->rq_task); 1375 spin_unlock(&xprt->queue_lock); 1376 task = rovr->rq_task; 1377 1378 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1379 copied = repsize; 1380 1381 /* Suck it into the iovec, verify checksum if not done by hw. */ 1382 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1383 spin_lock(&xprt->queue_lock); 1384 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1385 goto out_unpin; 1386 } 1387 1388 1389 spin_lock_bh(&xprt->transport_lock); 1390 xprt_adjust_cwnd(xprt, task, copied); 1391 spin_unlock_bh(&xprt->transport_lock); 1392 spin_lock(&xprt->queue_lock); 1393 xprt_complete_rqst(task, copied); 1394 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1395 out_unpin: 1396 xprt_unpin_rqst(rovr); 1397 out_unlock: 1398 spin_unlock(&xprt->queue_lock); 1399 } 1400 1401 static void xs_udp_data_receive(struct sock_xprt *transport) 1402 { 1403 struct sk_buff *skb; 1404 struct sock *sk; 1405 int err; 1406 1407 mutex_lock(&transport->recv_mutex); 1408 sk = transport->inet; 1409 if (sk == NULL) 1410 goto out; 1411 for (;;) { 1412 skb = skb_recv_udp(sk, 0, 1, &err); 1413 if (skb == NULL) 1414 break; 1415 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1416 consume_skb(skb); 1417 cond_resched(); 1418 } 1419 xs_poll_check_readable(transport); 1420 out: 1421 mutex_unlock(&transport->recv_mutex); 1422 } 1423 1424 static void xs_udp_data_receive_workfn(struct work_struct *work) 1425 { 1426 struct sock_xprt *transport = 1427 container_of(work, struct sock_xprt, recv_worker); 1428 unsigned int pflags = memalloc_nofs_save(); 1429 1430 xs_udp_data_receive(transport); 1431 memalloc_nofs_restore(pflags); 1432 } 1433 1434 /** 1435 * xs_data_ready - "data ready" callback for UDP sockets 1436 * @sk: socket with data to read 1437 * 1438 */ 1439 static void xs_data_ready(struct sock *sk) 1440 { 1441 struct rpc_xprt *xprt; 1442 1443 read_lock_bh(&sk->sk_callback_lock); 1444 dprintk("RPC: xs_data_ready...\n"); 1445 xprt = xprt_from_sock(sk); 1446 if (xprt != NULL) { 1447 struct sock_xprt *transport = container_of(xprt, 1448 struct sock_xprt, xprt); 1449 transport->old_data_ready(sk); 1450 /* Any data means we had a useful conversation, so 1451 * then we don't need to delay the next reconnect 1452 */ 1453 if (xprt->reestablish_timeout) 1454 xprt->reestablish_timeout = 0; 1455 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1456 queue_work(xprtiod_workqueue, &transport->recv_worker); 1457 } 1458 read_unlock_bh(&sk->sk_callback_lock); 1459 } 1460 1461 /* 1462 * Helper function to force a TCP close if the server is sending 1463 * junk and/or it has put us in CLOSE_WAIT 1464 */ 1465 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1466 { 1467 xprt_force_disconnect(xprt); 1468 } 1469 1470 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1471 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1472 { 1473 return PAGE_SIZE; 1474 } 1475 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1476 1477 /** 1478 * xs_tcp_state_change - callback to handle TCP socket state changes 1479 * @sk: socket whose state has changed 1480 * 1481 */ 1482 static void xs_tcp_state_change(struct sock *sk) 1483 { 1484 struct rpc_xprt *xprt; 1485 struct sock_xprt *transport; 1486 1487 read_lock_bh(&sk->sk_callback_lock); 1488 if (!(xprt = xprt_from_sock(sk))) 1489 goto out; 1490 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1491 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1492 sk->sk_state, xprt_connected(xprt), 1493 sock_flag(sk, SOCK_DEAD), 1494 sock_flag(sk, SOCK_ZAPPED), 1495 sk->sk_shutdown); 1496 1497 transport = container_of(xprt, struct sock_xprt, xprt); 1498 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1499 switch (sk->sk_state) { 1500 case TCP_ESTABLISHED: 1501 spin_lock(&xprt->transport_lock); 1502 if (!xprt_test_and_set_connected(xprt)) { 1503 xprt->connect_cookie++; 1504 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1505 xprt_clear_connecting(xprt); 1506 1507 xprt->stat.connect_count++; 1508 xprt->stat.connect_time += (long)jiffies - 1509 xprt->stat.connect_start; 1510 xprt_wake_pending_tasks(xprt, -EAGAIN); 1511 } 1512 spin_unlock(&xprt->transport_lock); 1513 break; 1514 case TCP_FIN_WAIT1: 1515 /* The client initiated a shutdown of the socket */ 1516 xprt->connect_cookie++; 1517 xprt->reestablish_timeout = 0; 1518 set_bit(XPRT_CLOSING, &xprt->state); 1519 smp_mb__before_atomic(); 1520 clear_bit(XPRT_CONNECTED, &xprt->state); 1521 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1522 smp_mb__after_atomic(); 1523 break; 1524 case TCP_CLOSE_WAIT: 1525 /* The server initiated a shutdown of the socket */ 1526 xprt->connect_cookie++; 1527 clear_bit(XPRT_CONNECTED, &xprt->state); 1528 xs_tcp_force_close(xprt); 1529 /* fall through */ 1530 case TCP_CLOSING: 1531 /* 1532 * If the server closed down the connection, make sure that 1533 * we back off before reconnecting 1534 */ 1535 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1536 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1537 break; 1538 case TCP_LAST_ACK: 1539 set_bit(XPRT_CLOSING, &xprt->state); 1540 smp_mb__before_atomic(); 1541 clear_bit(XPRT_CONNECTED, &xprt->state); 1542 smp_mb__after_atomic(); 1543 break; 1544 case TCP_CLOSE: 1545 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1546 &transport->sock_state)) 1547 xprt_clear_connecting(xprt); 1548 clear_bit(XPRT_CLOSING, &xprt->state); 1549 /* Trigger the socket release */ 1550 xs_tcp_force_close(xprt); 1551 } 1552 out: 1553 read_unlock_bh(&sk->sk_callback_lock); 1554 } 1555 1556 static void xs_write_space(struct sock *sk) 1557 { 1558 struct socket_wq *wq; 1559 struct rpc_xprt *xprt; 1560 1561 if (!sk->sk_socket) 1562 return; 1563 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1564 1565 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1566 return; 1567 rcu_read_lock(); 1568 wq = rcu_dereference(sk->sk_wq); 1569 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1570 goto out; 1571 1572 if (xprt_write_space(xprt)) 1573 sk->sk_write_pending--; 1574 out: 1575 rcu_read_unlock(); 1576 } 1577 1578 /** 1579 * xs_udp_write_space - callback invoked when socket buffer space 1580 * becomes available 1581 * @sk: socket whose state has changed 1582 * 1583 * Called when more output buffer space is available for this socket. 1584 * We try not to wake our writers until they can make "significant" 1585 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1586 * with a bunch of small requests. 1587 */ 1588 static void xs_udp_write_space(struct sock *sk) 1589 { 1590 read_lock_bh(&sk->sk_callback_lock); 1591 1592 /* from net/core/sock.c:sock_def_write_space */ 1593 if (sock_writeable(sk)) 1594 xs_write_space(sk); 1595 1596 read_unlock_bh(&sk->sk_callback_lock); 1597 } 1598 1599 /** 1600 * xs_tcp_write_space - callback invoked when socket buffer space 1601 * becomes available 1602 * @sk: socket whose state has changed 1603 * 1604 * Called when more output buffer space is available for this socket. 1605 * We try not to wake our writers until they can make "significant" 1606 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1607 * with a bunch of small requests. 1608 */ 1609 static void xs_tcp_write_space(struct sock *sk) 1610 { 1611 read_lock_bh(&sk->sk_callback_lock); 1612 1613 /* from net/core/stream.c:sk_stream_write_space */ 1614 if (sk_stream_is_writeable(sk)) 1615 xs_write_space(sk); 1616 1617 read_unlock_bh(&sk->sk_callback_lock); 1618 } 1619 1620 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1621 { 1622 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1623 struct sock *sk = transport->inet; 1624 1625 if (transport->rcvsize) { 1626 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1627 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1628 } 1629 if (transport->sndsize) { 1630 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1631 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1632 sk->sk_write_space(sk); 1633 } 1634 } 1635 1636 /** 1637 * xs_udp_set_buffer_size - set send and receive limits 1638 * @xprt: generic transport 1639 * @sndsize: requested size of send buffer, in bytes 1640 * @rcvsize: requested size of receive buffer, in bytes 1641 * 1642 * Set socket send and receive buffer size limits. 1643 */ 1644 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1645 { 1646 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1647 1648 transport->sndsize = 0; 1649 if (sndsize) 1650 transport->sndsize = sndsize + 1024; 1651 transport->rcvsize = 0; 1652 if (rcvsize) 1653 transport->rcvsize = rcvsize + 1024; 1654 1655 xs_udp_do_set_buffer_size(xprt); 1656 } 1657 1658 /** 1659 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1660 * @xprt: controlling transport 1661 * @task: task that timed out 1662 * 1663 * Adjust the congestion window after a retransmit timeout has occurred. 1664 */ 1665 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1666 { 1667 spin_lock_bh(&xprt->transport_lock); 1668 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1669 spin_unlock_bh(&xprt->transport_lock); 1670 } 1671 1672 static int xs_get_random_port(void) 1673 { 1674 unsigned short min = xprt_min_resvport, max = xprt_max_resvport; 1675 unsigned short range; 1676 unsigned short rand; 1677 1678 if (max < min) 1679 return -EADDRINUSE; 1680 range = max - min + 1; 1681 rand = (unsigned short) prandom_u32() % range; 1682 return rand + min; 1683 } 1684 1685 /** 1686 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1687 * @sock: socket 1688 * 1689 * Note that this function has to be called on all sockets that share the 1690 * same port, and it must be called before binding. 1691 */ 1692 static void xs_sock_set_reuseport(struct socket *sock) 1693 { 1694 int opt = 1; 1695 1696 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1697 (char *)&opt, sizeof(opt)); 1698 } 1699 1700 static unsigned short xs_sock_getport(struct socket *sock) 1701 { 1702 struct sockaddr_storage buf; 1703 unsigned short port = 0; 1704 1705 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) 1706 goto out; 1707 switch (buf.ss_family) { 1708 case AF_INET6: 1709 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1710 break; 1711 case AF_INET: 1712 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1713 } 1714 out: 1715 return port; 1716 } 1717 1718 /** 1719 * xs_set_port - reset the port number in the remote endpoint address 1720 * @xprt: generic transport 1721 * @port: new port number 1722 * 1723 */ 1724 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1725 { 1726 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1727 1728 rpc_set_port(xs_addr(xprt), port); 1729 xs_update_peer_port(xprt); 1730 } 1731 1732 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1733 { 1734 if (transport->srcport == 0) 1735 transport->srcport = xs_sock_getport(sock); 1736 } 1737 1738 static int xs_get_srcport(struct sock_xprt *transport) 1739 { 1740 int port = transport->srcport; 1741 1742 if (port == 0 && transport->xprt.resvport) 1743 port = xs_get_random_port(); 1744 return port; 1745 } 1746 1747 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1748 { 1749 if (transport->srcport != 0) 1750 transport->srcport = 0; 1751 if (!transport->xprt.resvport) 1752 return 0; 1753 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1754 return xprt_max_resvport; 1755 return --port; 1756 } 1757 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1758 { 1759 struct sockaddr_storage myaddr; 1760 int err, nloop = 0; 1761 int port = xs_get_srcport(transport); 1762 unsigned short last; 1763 1764 /* 1765 * If we are asking for any ephemeral port (i.e. port == 0 && 1766 * transport->xprt.resvport == 0), don't bind. Let the local 1767 * port selection happen implicitly when the socket is used 1768 * (for example at connect time). 1769 * 1770 * This ensures that we can continue to establish TCP 1771 * connections even when all local ephemeral ports are already 1772 * a part of some TCP connection. This makes no difference 1773 * for UDP sockets, but also doens't harm them. 1774 * 1775 * If we're asking for any reserved port (i.e. port == 0 && 1776 * transport->xprt.resvport == 1) xs_get_srcport above will 1777 * ensure that port is non-zero and we will bind as needed. 1778 */ 1779 if (port <= 0) 1780 return port; 1781 1782 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1783 do { 1784 rpc_set_port((struct sockaddr *)&myaddr, port); 1785 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1786 transport->xprt.addrlen); 1787 if (err == 0) { 1788 transport->srcport = port; 1789 break; 1790 } 1791 last = port; 1792 port = xs_next_srcport(transport, port); 1793 if (port > last) 1794 nloop++; 1795 } while (err == -EADDRINUSE && nloop != 2); 1796 1797 if (myaddr.ss_family == AF_INET) 1798 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1799 &((struct sockaddr_in *)&myaddr)->sin_addr, 1800 port, err ? "failed" : "ok", err); 1801 else 1802 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1803 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1804 port, err ? "failed" : "ok", err); 1805 return err; 1806 } 1807 1808 /* 1809 * We don't support autobind on AF_LOCAL sockets 1810 */ 1811 static void xs_local_rpcbind(struct rpc_task *task) 1812 { 1813 xprt_set_bound(task->tk_xprt); 1814 } 1815 1816 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1817 { 1818 } 1819 1820 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1821 static struct lock_class_key xs_key[2]; 1822 static struct lock_class_key xs_slock_key[2]; 1823 1824 static inline void xs_reclassify_socketu(struct socket *sock) 1825 { 1826 struct sock *sk = sock->sk; 1827 1828 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1829 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1830 } 1831 1832 static inline void xs_reclassify_socket4(struct socket *sock) 1833 { 1834 struct sock *sk = sock->sk; 1835 1836 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1837 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1838 } 1839 1840 static inline void xs_reclassify_socket6(struct socket *sock) 1841 { 1842 struct sock *sk = sock->sk; 1843 1844 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1845 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1846 } 1847 1848 static inline void xs_reclassify_socket(int family, struct socket *sock) 1849 { 1850 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1851 return; 1852 1853 switch (family) { 1854 case AF_LOCAL: 1855 xs_reclassify_socketu(sock); 1856 break; 1857 case AF_INET: 1858 xs_reclassify_socket4(sock); 1859 break; 1860 case AF_INET6: 1861 xs_reclassify_socket6(sock); 1862 break; 1863 } 1864 } 1865 #else 1866 static inline void xs_reclassify_socket(int family, struct socket *sock) 1867 { 1868 } 1869 #endif 1870 1871 static void xs_dummy_setup_socket(struct work_struct *work) 1872 { 1873 } 1874 1875 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1876 struct sock_xprt *transport, int family, int type, 1877 int protocol, bool reuseport) 1878 { 1879 struct file *filp; 1880 struct socket *sock; 1881 int err; 1882 1883 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1884 if (err < 0) { 1885 dprintk("RPC: can't create %d transport socket (%d).\n", 1886 protocol, -err); 1887 goto out; 1888 } 1889 xs_reclassify_socket(family, sock); 1890 1891 if (reuseport) 1892 xs_sock_set_reuseport(sock); 1893 1894 err = xs_bind(transport, sock); 1895 if (err) { 1896 sock_release(sock); 1897 goto out; 1898 } 1899 1900 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1901 if (IS_ERR(filp)) 1902 return ERR_CAST(filp); 1903 transport->file = filp; 1904 1905 return sock; 1906 out: 1907 return ERR_PTR(err); 1908 } 1909 1910 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1911 struct socket *sock) 1912 { 1913 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1914 xprt); 1915 1916 if (!transport->inet) { 1917 struct sock *sk = sock->sk; 1918 1919 write_lock_bh(&sk->sk_callback_lock); 1920 1921 xs_save_old_callbacks(transport, sk); 1922 1923 sk->sk_user_data = xprt; 1924 sk->sk_data_ready = xs_data_ready; 1925 sk->sk_write_space = xs_udp_write_space; 1926 sock_set_flag(sk, SOCK_FASYNC); 1927 sk->sk_error_report = xs_error_report; 1928 1929 xprt_clear_connected(xprt); 1930 1931 /* Reset to new socket */ 1932 transport->sock = sock; 1933 transport->inet = sk; 1934 1935 write_unlock_bh(&sk->sk_callback_lock); 1936 } 1937 1938 xs_stream_start_connect(transport); 1939 1940 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1941 } 1942 1943 /** 1944 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1945 * @transport: socket transport to connect 1946 */ 1947 static int xs_local_setup_socket(struct sock_xprt *transport) 1948 { 1949 struct rpc_xprt *xprt = &transport->xprt; 1950 struct file *filp; 1951 struct socket *sock; 1952 int status = -EIO; 1953 1954 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1955 SOCK_STREAM, 0, &sock, 1); 1956 if (status < 0) { 1957 dprintk("RPC: can't create AF_LOCAL " 1958 "transport socket (%d).\n", -status); 1959 goto out; 1960 } 1961 xs_reclassify_socket(AF_LOCAL, sock); 1962 1963 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1964 if (IS_ERR(filp)) { 1965 status = PTR_ERR(filp); 1966 goto out; 1967 } 1968 transport->file = filp; 1969 1970 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1971 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1972 1973 status = xs_local_finish_connecting(xprt, sock); 1974 trace_rpc_socket_connect(xprt, sock, status); 1975 switch (status) { 1976 case 0: 1977 dprintk("RPC: xprt %p connected to %s\n", 1978 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1979 xprt->stat.connect_count++; 1980 xprt->stat.connect_time += (long)jiffies - 1981 xprt->stat.connect_start; 1982 xprt_set_connected(xprt); 1983 case -ENOBUFS: 1984 break; 1985 case -ENOENT: 1986 dprintk("RPC: xprt %p: socket %s does not exist\n", 1987 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1988 break; 1989 case -ECONNREFUSED: 1990 dprintk("RPC: xprt %p: connection refused for %s\n", 1991 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1992 break; 1993 default: 1994 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1995 __func__, -status, 1996 xprt->address_strings[RPC_DISPLAY_ADDR]); 1997 } 1998 1999 out: 2000 xprt_clear_connecting(xprt); 2001 xprt_wake_pending_tasks(xprt, status); 2002 return status; 2003 } 2004 2005 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2006 { 2007 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2008 int ret; 2009 2010 if (RPC_IS_ASYNC(task)) { 2011 /* 2012 * We want the AF_LOCAL connect to be resolved in the 2013 * filesystem namespace of the process making the rpc 2014 * call. Thus we connect synchronously. 2015 * 2016 * If we want to support asynchronous AF_LOCAL calls, 2017 * we'll need to figure out how to pass a namespace to 2018 * connect. 2019 */ 2020 rpc_exit(task, -ENOTCONN); 2021 return; 2022 } 2023 ret = xs_local_setup_socket(transport); 2024 if (ret && !RPC_IS_SOFTCONN(task)) 2025 msleep_interruptible(15000); 2026 } 2027 2028 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2029 /* 2030 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2031 * know that we have exclusive access to the socket), to guard against 2032 * races with xs_reset_transport. 2033 */ 2034 static void xs_set_memalloc(struct rpc_xprt *xprt) 2035 { 2036 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2037 xprt); 2038 2039 /* 2040 * If there's no sock, then we have nothing to set. The 2041 * reconnecting process will get it for us. 2042 */ 2043 if (!transport->inet) 2044 return; 2045 if (atomic_read(&xprt->swapper)) 2046 sk_set_memalloc(transport->inet); 2047 } 2048 2049 /** 2050 * xs_enable_swap - Tag this transport as being used for swap. 2051 * @xprt: transport to tag 2052 * 2053 * Take a reference to this transport on behalf of the rpc_clnt, and 2054 * optionally mark it for swapping if it wasn't already. 2055 */ 2056 static int 2057 xs_enable_swap(struct rpc_xprt *xprt) 2058 { 2059 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2060 2061 if (atomic_inc_return(&xprt->swapper) != 1) 2062 return 0; 2063 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2064 return -ERESTARTSYS; 2065 if (xs->inet) 2066 sk_set_memalloc(xs->inet); 2067 xprt_release_xprt(xprt, NULL); 2068 return 0; 2069 } 2070 2071 /** 2072 * xs_disable_swap - Untag this transport as being used for swap. 2073 * @xprt: transport to tag 2074 * 2075 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2076 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2077 */ 2078 static void 2079 xs_disable_swap(struct rpc_xprt *xprt) 2080 { 2081 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2082 2083 if (!atomic_dec_and_test(&xprt->swapper)) 2084 return; 2085 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2086 return; 2087 if (xs->inet) 2088 sk_clear_memalloc(xs->inet); 2089 xprt_release_xprt(xprt, NULL); 2090 } 2091 #else 2092 static void xs_set_memalloc(struct rpc_xprt *xprt) 2093 { 2094 } 2095 2096 static int 2097 xs_enable_swap(struct rpc_xprt *xprt) 2098 { 2099 return -EINVAL; 2100 } 2101 2102 static void 2103 xs_disable_swap(struct rpc_xprt *xprt) 2104 { 2105 } 2106 #endif 2107 2108 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2109 { 2110 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2111 2112 if (!transport->inet) { 2113 struct sock *sk = sock->sk; 2114 2115 write_lock_bh(&sk->sk_callback_lock); 2116 2117 xs_save_old_callbacks(transport, sk); 2118 2119 sk->sk_user_data = xprt; 2120 sk->sk_data_ready = xs_data_ready; 2121 sk->sk_write_space = xs_udp_write_space; 2122 sock_set_flag(sk, SOCK_FASYNC); 2123 2124 xprt_set_connected(xprt); 2125 2126 /* Reset to new socket */ 2127 transport->sock = sock; 2128 transport->inet = sk; 2129 2130 xs_set_memalloc(xprt); 2131 2132 write_unlock_bh(&sk->sk_callback_lock); 2133 } 2134 xs_udp_do_set_buffer_size(xprt); 2135 2136 xprt->stat.connect_start = jiffies; 2137 } 2138 2139 static void xs_udp_setup_socket(struct work_struct *work) 2140 { 2141 struct sock_xprt *transport = 2142 container_of(work, struct sock_xprt, connect_worker.work); 2143 struct rpc_xprt *xprt = &transport->xprt; 2144 struct socket *sock; 2145 int status = -EIO; 2146 2147 sock = xs_create_sock(xprt, transport, 2148 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2149 IPPROTO_UDP, false); 2150 if (IS_ERR(sock)) 2151 goto out; 2152 2153 dprintk("RPC: worker connecting xprt %p via %s to " 2154 "%s (port %s)\n", xprt, 2155 xprt->address_strings[RPC_DISPLAY_PROTO], 2156 xprt->address_strings[RPC_DISPLAY_ADDR], 2157 xprt->address_strings[RPC_DISPLAY_PORT]); 2158 2159 xs_udp_finish_connecting(xprt, sock); 2160 trace_rpc_socket_connect(xprt, sock, 0); 2161 status = 0; 2162 out: 2163 xprt_clear_connecting(xprt); 2164 xprt_unlock_connect(xprt, transport); 2165 xprt_wake_pending_tasks(xprt, status); 2166 } 2167 2168 /** 2169 * xs_tcp_shutdown - gracefully shut down a TCP socket 2170 * @xprt: transport 2171 * 2172 * Initiates a graceful shutdown of the TCP socket by calling the 2173 * equivalent of shutdown(SHUT_RDWR); 2174 */ 2175 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2176 { 2177 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2178 struct socket *sock = transport->sock; 2179 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; 2180 2181 if (sock == NULL) 2182 return; 2183 switch (skst) { 2184 default: 2185 kernel_sock_shutdown(sock, SHUT_RDWR); 2186 trace_rpc_socket_shutdown(xprt, sock); 2187 break; 2188 case TCP_CLOSE: 2189 case TCP_TIME_WAIT: 2190 xs_reset_transport(transport); 2191 } 2192 } 2193 2194 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2195 struct socket *sock) 2196 { 2197 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2198 unsigned int keepidle; 2199 unsigned int keepcnt; 2200 unsigned int opt_on = 1; 2201 unsigned int timeo; 2202 2203 spin_lock_bh(&xprt->transport_lock); 2204 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2205 keepcnt = xprt->timeout->to_retries + 1; 2206 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2207 (xprt->timeout->to_retries + 1); 2208 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2209 spin_unlock_bh(&xprt->transport_lock); 2210 2211 /* TCP Keepalive options */ 2212 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2213 (char *)&opt_on, sizeof(opt_on)); 2214 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2215 (char *)&keepidle, sizeof(keepidle)); 2216 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2217 (char *)&keepidle, sizeof(keepidle)); 2218 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2219 (char *)&keepcnt, sizeof(keepcnt)); 2220 2221 /* TCP user timeout (see RFC5482) */ 2222 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, 2223 (char *)&timeo, sizeof(timeo)); 2224 } 2225 2226 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2227 unsigned long connect_timeout, 2228 unsigned long reconnect_timeout) 2229 { 2230 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2231 struct rpc_timeout to; 2232 unsigned long initval; 2233 2234 spin_lock_bh(&xprt->transport_lock); 2235 if (reconnect_timeout < xprt->max_reconnect_timeout) 2236 xprt->max_reconnect_timeout = reconnect_timeout; 2237 if (connect_timeout < xprt->connect_timeout) { 2238 memcpy(&to, xprt->timeout, sizeof(to)); 2239 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2240 /* Arbitrary lower limit */ 2241 if (initval < XS_TCP_INIT_REEST_TO << 1) 2242 initval = XS_TCP_INIT_REEST_TO << 1; 2243 to.to_initval = initval; 2244 to.to_maxval = initval; 2245 memcpy(&transport->tcp_timeout, &to, 2246 sizeof(transport->tcp_timeout)); 2247 xprt->timeout = &transport->tcp_timeout; 2248 xprt->connect_timeout = connect_timeout; 2249 } 2250 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2251 spin_unlock_bh(&xprt->transport_lock); 2252 } 2253 2254 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2255 { 2256 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2257 int ret = -ENOTCONN; 2258 2259 if (!transport->inet) { 2260 struct sock *sk = sock->sk; 2261 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC; 2262 2263 /* Avoid temporary address, they are bad for long-lived 2264 * connections such as NFS mounts. 2265 * RFC4941, section 3.6 suggests that: 2266 * Individual applications, which have specific 2267 * knowledge about the normal duration of connections, 2268 * MAY override this as appropriate. 2269 */ 2270 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES, 2271 (char *)&addr_pref, sizeof(addr_pref)); 2272 2273 xs_tcp_set_socket_timeouts(xprt, sock); 2274 2275 write_lock_bh(&sk->sk_callback_lock); 2276 2277 xs_save_old_callbacks(transport, sk); 2278 2279 sk->sk_user_data = xprt; 2280 sk->sk_data_ready = xs_data_ready; 2281 sk->sk_state_change = xs_tcp_state_change; 2282 sk->sk_write_space = xs_tcp_write_space; 2283 sock_set_flag(sk, SOCK_FASYNC); 2284 sk->sk_error_report = xs_error_report; 2285 2286 /* socket options */ 2287 sock_reset_flag(sk, SOCK_LINGER); 2288 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2289 2290 xprt_clear_connected(xprt); 2291 2292 /* Reset to new socket */ 2293 transport->sock = sock; 2294 transport->inet = sk; 2295 2296 write_unlock_bh(&sk->sk_callback_lock); 2297 } 2298 2299 if (!xprt_bound(xprt)) 2300 goto out; 2301 2302 xs_set_memalloc(xprt); 2303 2304 xs_stream_start_connect(transport); 2305 2306 /* Tell the socket layer to start connecting... */ 2307 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2308 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2309 switch (ret) { 2310 case 0: 2311 xs_set_srcport(transport, sock); 2312 /* fall through */ 2313 case -EINPROGRESS: 2314 /* SYN_SENT! */ 2315 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2316 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2317 break; 2318 case -EADDRNOTAVAIL: 2319 /* Source port number is unavailable. Try a new one! */ 2320 transport->srcport = 0; 2321 } 2322 out: 2323 return ret; 2324 } 2325 2326 /** 2327 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2328 * @work: queued work item 2329 * 2330 * Invoked by a work queue tasklet. 2331 */ 2332 static void xs_tcp_setup_socket(struct work_struct *work) 2333 { 2334 struct sock_xprt *transport = 2335 container_of(work, struct sock_xprt, connect_worker.work); 2336 struct socket *sock = transport->sock; 2337 struct rpc_xprt *xprt = &transport->xprt; 2338 int status = -EIO; 2339 2340 if (!sock) { 2341 sock = xs_create_sock(xprt, transport, 2342 xs_addr(xprt)->sa_family, SOCK_STREAM, 2343 IPPROTO_TCP, true); 2344 if (IS_ERR(sock)) { 2345 status = PTR_ERR(sock); 2346 goto out; 2347 } 2348 } 2349 2350 dprintk("RPC: worker connecting xprt %p via %s to " 2351 "%s (port %s)\n", xprt, 2352 xprt->address_strings[RPC_DISPLAY_PROTO], 2353 xprt->address_strings[RPC_DISPLAY_ADDR], 2354 xprt->address_strings[RPC_DISPLAY_PORT]); 2355 2356 status = xs_tcp_finish_connecting(xprt, sock); 2357 trace_rpc_socket_connect(xprt, sock, status); 2358 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2359 xprt, -status, xprt_connected(xprt), 2360 sock->sk->sk_state); 2361 switch (status) { 2362 default: 2363 printk("%s: connect returned unhandled error %d\n", 2364 __func__, status); 2365 /* fall through */ 2366 case -EADDRNOTAVAIL: 2367 /* We're probably in TIME_WAIT. Get rid of existing socket, 2368 * and retry 2369 */ 2370 xs_tcp_force_close(xprt); 2371 break; 2372 case 0: 2373 case -EINPROGRESS: 2374 case -EALREADY: 2375 xprt_unlock_connect(xprt, transport); 2376 return; 2377 case -EINVAL: 2378 /* Happens, for instance, if the user specified a link 2379 * local IPv6 address without a scope-id. 2380 */ 2381 case -ECONNREFUSED: 2382 case -ECONNRESET: 2383 case -ENETDOWN: 2384 case -ENETUNREACH: 2385 case -EHOSTUNREACH: 2386 case -EADDRINUSE: 2387 case -ENOBUFS: 2388 /* 2389 * xs_tcp_force_close() wakes tasks with -EIO. 2390 * We need to wake them first to ensure the 2391 * correct error code. 2392 */ 2393 xprt_wake_pending_tasks(xprt, status); 2394 xs_tcp_force_close(xprt); 2395 goto out; 2396 } 2397 status = -EAGAIN; 2398 out: 2399 xprt_clear_connecting(xprt); 2400 xprt_unlock_connect(xprt, transport); 2401 xprt_wake_pending_tasks(xprt, status); 2402 } 2403 2404 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt) 2405 { 2406 unsigned long start, now = jiffies; 2407 2408 start = xprt->stat.connect_start + xprt->reestablish_timeout; 2409 if (time_after(start, now)) 2410 return start - now; 2411 return 0; 2412 } 2413 2414 static void xs_reconnect_backoff(struct rpc_xprt *xprt) 2415 { 2416 xprt->reestablish_timeout <<= 1; 2417 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) 2418 xprt->reestablish_timeout = xprt->max_reconnect_timeout; 2419 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2420 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2421 } 2422 2423 /** 2424 * xs_connect - connect a socket to a remote endpoint 2425 * @xprt: pointer to transport structure 2426 * @task: address of RPC task that manages state of connect request 2427 * 2428 * TCP: If the remote end dropped the connection, delay reconnecting. 2429 * 2430 * UDP socket connects are synchronous, but we use a work queue anyway 2431 * to guarantee that even unprivileged user processes can set up a 2432 * socket on a privileged port. 2433 * 2434 * If a UDP socket connect fails, the delay behavior here prevents 2435 * retry floods (hard mounts). 2436 */ 2437 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2438 { 2439 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2440 unsigned long delay = 0; 2441 2442 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2443 2444 if (transport->sock != NULL) { 2445 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2446 "seconds\n", 2447 xprt, xprt->reestablish_timeout / HZ); 2448 2449 /* Start by resetting any existing state */ 2450 xs_reset_transport(transport); 2451 2452 delay = xs_reconnect_delay(xprt); 2453 xs_reconnect_backoff(xprt); 2454 2455 } else 2456 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2457 2458 queue_delayed_work(xprtiod_workqueue, 2459 &transport->connect_worker, 2460 delay); 2461 } 2462 2463 /** 2464 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2465 * @xprt: rpc_xprt struct containing statistics 2466 * @seq: output file 2467 * 2468 */ 2469 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2470 { 2471 long idle_time = 0; 2472 2473 if (xprt_connected(xprt)) 2474 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2475 2476 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2477 "%llu %llu %lu %llu %llu\n", 2478 xprt->stat.bind_count, 2479 xprt->stat.connect_count, 2480 xprt->stat.connect_time / HZ, 2481 idle_time, 2482 xprt->stat.sends, 2483 xprt->stat.recvs, 2484 xprt->stat.bad_xids, 2485 xprt->stat.req_u, 2486 xprt->stat.bklog_u, 2487 xprt->stat.max_slots, 2488 xprt->stat.sending_u, 2489 xprt->stat.pending_u); 2490 } 2491 2492 /** 2493 * xs_udp_print_stats - display UDP socket-specifc stats 2494 * @xprt: rpc_xprt struct containing statistics 2495 * @seq: output file 2496 * 2497 */ 2498 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2499 { 2500 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2501 2502 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2503 "%lu %llu %llu\n", 2504 transport->srcport, 2505 xprt->stat.bind_count, 2506 xprt->stat.sends, 2507 xprt->stat.recvs, 2508 xprt->stat.bad_xids, 2509 xprt->stat.req_u, 2510 xprt->stat.bklog_u, 2511 xprt->stat.max_slots, 2512 xprt->stat.sending_u, 2513 xprt->stat.pending_u); 2514 } 2515 2516 /** 2517 * xs_tcp_print_stats - display TCP socket-specifc stats 2518 * @xprt: rpc_xprt struct containing statistics 2519 * @seq: output file 2520 * 2521 */ 2522 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2523 { 2524 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2525 long idle_time = 0; 2526 2527 if (xprt_connected(xprt)) 2528 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2529 2530 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2531 "%llu %llu %lu %llu %llu\n", 2532 transport->srcport, 2533 xprt->stat.bind_count, 2534 xprt->stat.connect_count, 2535 xprt->stat.connect_time / HZ, 2536 idle_time, 2537 xprt->stat.sends, 2538 xprt->stat.recvs, 2539 xprt->stat.bad_xids, 2540 xprt->stat.req_u, 2541 xprt->stat.bklog_u, 2542 xprt->stat.max_slots, 2543 xprt->stat.sending_u, 2544 xprt->stat.pending_u); 2545 } 2546 2547 /* 2548 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2549 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2550 * to use the server side send routines. 2551 */ 2552 static int bc_malloc(struct rpc_task *task) 2553 { 2554 struct rpc_rqst *rqst = task->tk_rqstp; 2555 size_t size = rqst->rq_callsize; 2556 struct page *page; 2557 struct rpc_buffer *buf; 2558 2559 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2560 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2561 size); 2562 return -EINVAL; 2563 } 2564 2565 page = alloc_page(GFP_KERNEL); 2566 if (!page) 2567 return -ENOMEM; 2568 2569 buf = page_address(page); 2570 buf->len = PAGE_SIZE; 2571 2572 rqst->rq_buffer = buf->data; 2573 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2574 return 0; 2575 } 2576 2577 /* 2578 * Free the space allocated in the bc_alloc routine 2579 */ 2580 static void bc_free(struct rpc_task *task) 2581 { 2582 void *buffer = task->tk_rqstp->rq_buffer; 2583 struct rpc_buffer *buf; 2584 2585 buf = container_of(buffer, struct rpc_buffer, data); 2586 free_page((unsigned long)buf); 2587 } 2588 2589 /* 2590 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2591 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2592 */ 2593 static int bc_sendto(struct rpc_rqst *req) 2594 { 2595 int len; 2596 struct xdr_buf *xbufp = &req->rq_snd_buf; 2597 struct sock_xprt *transport = 2598 container_of(req->rq_xprt, struct sock_xprt, xprt); 2599 unsigned long headoff; 2600 unsigned long tailoff; 2601 struct page *tailpage; 2602 struct msghdr msg = { 2603 .msg_flags = MSG_MORE 2604 }; 2605 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | 2606 (u32)xbufp->len); 2607 struct kvec iov = { 2608 .iov_base = &marker, 2609 .iov_len = sizeof(marker), 2610 }; 2611 2612 len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len); 2613 if (len != iov.iov_len) 2614 return -EAGAIN; 2615 2616 tailpage = NULL; 2617 if (xbufp->tail[0].iov_len) 2618 tailpage = virt_to_page(xbufp->tail[0].iov_base); 2619 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2620 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2621 len = svc_send_common(transport->sock, xbufp, 2622 virt_to_page(xbufp->head[0].iov_base), headoff, 2623 tailpage, tailoff); 2624 if (len != xbufp->len) 2625 return -EAGAIN; 2626 return len; 2627 } 2628 2629 /* 2630 * The send routine. Borrows from svc_send 2631 */ 2632 static int bc_send_request(struct rpc_rqst *req) 2633 { 2634 struct svc_xprt *xprt; 2635 int len; 2636 2637 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid)); 2638 /* 2639 * Get the server socket associated with this callback xprt 2640 */ 2641 xprt = req->rq_xprt->bc_xprt; 2642 2643 /* 2644 * Grab the mutex to serialize data as the connection is shared 2645 * with the fore channel 2646 */ 2647 mutex_lock(&xprt->xpt_mutex); 2648 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2649 len = -ENOTCONN; 2650 else 2651 len = bc_sendto(req); 2652 mutex_unlock(&xprt->xpt_mutex); 2653 2654 if (len > 0) 2655 len = 0; 2656 2657 return len; 2658 } 2659 2660 /* 2661 * The close routine. Since this is client initiated, we do nothing 2662 */ 2663 2664 static void bc_close(struct rpc_xprt *xprt) 2665 { 2666 } 2667 2668 /* 2669 * The xprt destroy routine. Again, because this connection is client 2670 * initiated, we do nothing 2671 */ 2672 2673 static void bc_destroy(struct rpc_xprt *xprt) 2674 { 2675 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2676 2677 xs_xprt_free(xprt); 2678 module_put(THIS_MODULE); 2679 } 2680 2681 static const struct rpc_xprt_ops xs_local_ops = { 2682 .reserve_xprt = xprt_reserve_xprt, 2683 .release_xprt = xprt_release_xprt, 2684 .alloc_slot = xprt_alloc_slot, 2685 .free_slot = xprt_free_slot, 2686 .rpcbind = xs_local_rpcbind, 2687 .set_port = xs_local_set_port, 2688 .connect = xs_local_connect, 2689 .buf_alloc = rpc_malloc, 2690 .buf_free = rpc_free, 2691 .prepare_request = xs_stream_prepare_request, 2692 .send_request = xs_local_send_request, 2693 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2694 .close = xs_close, 2695 .destroy = xs_destroy, 2696 .print_stats = xs_local_print_stats, 2697 .enable_swap = xs_enable_swap, 2698 .disable_swap = xs_disable_swap, 2699 }; 2700 2701 static const struct rpc_xprt_ops xs_udp_ops = { 2702 .set_buffer_size = xs_udp_set_buffer_size, 2703 .reserve_xprt = xprt_reserve_xprt_cong, 2704 .release_xprt = xprt_release_xprt_cong, 2705 .alloc_slot = xprt_alloc_slot, 2706 .free_slot = xprt_free_slot, 2707 .rpcbind = rpcb_getport_async, 2708 .set_port = xs_set_port, 2709 .connect = xs_connect, 2710 .buf_alloc = rpc_malloc, 2711 .buf_free = rpc_free, 2712 .send_request = xs_udp_send_request, 2713 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 2714 .timer = xs_udp_timer, 2715 .release_request = xprt_release_rqst_cong, 2716 .close = xs_close, 2717 .destroy = xs_destroy, 2718 .print_stats = xs_udp_print_stats, 2719 .enable_swap = xs_enable_swap, 2720 .disable_swap = xs_disable_swap, 2721 .inject_disconnect = xs_inject_disconnect, 2722 }; 2723 2724 static const struct rpc_xprt_ops xs_tcp_ops = { 2725 .reserve_xprt = xprt_reserve_xprt, 2726 .release_xprt = xprt_release_xprt, 2727 .alloc_slot = xprt_alloc_slot, 2728 .free_slot = xprt_free_slot, 2729 .rpcbind = rpcb_getport_async, 2730 .set_port = xs_set_port, 2731 .connect = xs_connect, 2732 .buf_alloc = rpc_malloc, 2733 .buf_free = rpc_free, 2734 .prepare_request = xs_stream_prepare_request, 2735 .send_request = xs_tcp_send_request, 2736 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2737 .close = xs_tcp_shutdown, 2738 .destroy = xs_destroy, 2739 .set_connect_timeout = xs_tcp_set_connect_timeout, 2740 .print_stats = xs_tcp_print_stats, 2741 .enable_swap = xs_enable_swap, 2742 .disable_swap = xs_disable_swap, 2743 .inject_disconnect = xs_inject_disconnect, 2744 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2745 .bc_setup = xprt_setup_bc, 2746 .bc_maxpayload = xs_tcp_bc_maxpayload, 2747 .bc_free_rqst = xprt_free_bc_rqst, 2748 .bc_destroy = xprt_destroy_bc, 2749 #endif 2750 }; 2751 2752 /* 2753 * The rpc_xprt_ops for the server backchannel 2754 */ 2755 2756 static const struct rpc_xprt_ops bc_tcp_ops = { 2757 .reserve_xprt = xprt_reserve_xprt, 2758 .release_xprt = xprt_release_xprt, 2759 .alloc_slot = xprt_alloc_slot, 2760 .free_slot = xprt_free_slot, 2761 .buf_alloc = bc_malloc, 2762 .buf_free = bc_free, 2763 .send_request = bc_send_request, 2764 .set_retrans_timeout = xprt_set_retrans_timeout_def, 2765 .close = bc_close, 2766 .destroy = bc_destroy, 2767 .print_stats = xs_tcp_print_stats, 2768 .enable_swap = xs_enable_swap, 2769 .disable_swap = xs_disable_swap, 2770 .inject_disconnect = xs_inject_disconnect, 2771 }; 2772 2773 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2774 { 2775 static const struct sockaddr_in sin = { 2776 .sin_family = AF_INET, 2777 .sin_addr.s_addr = htonl(INADDR_ANY), 2778 }; 2779 static const struct sockaddr_in6 sin6 = { 2780 .sin6_family = AF_INET6, 2781 .sin6_addr = IN6ADDR_ANY_INIT, 2782 }; 2783 2784 switch (family) { 2785 case AF_LOCAL: 2786 break; 2787 case AF_INET: 2788 memcpy(sap, &sin, sizeof(sin)); 2789 break; 2790 case AF_INET6: 2791 memcpy(sap, &sin6, sizeof(sin6)); 2792 break; 2793 default: 2794 dprintk("RPC: %s: Bad address family\n", __func__); 2795 return -EAFNOSUPPORT; 2796 } 2797 return 0; 2798 } 2799 2800 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2801 unsigned int slot_table_size, 2802 unsigned int max_slot_table_size) 2803 { 2804 struct rpc_xprt *xprt; 2805 struct sock_xprt *new; 2806 2807 if (args->addrlen > sizeof(xprt->addr)) { 2808 dprintk("RPC: xs_setup_xprt: address too large\n"); 2809 return ERR_PTR(-EBADF); 2810 } 2811 2812 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2813 max_slot_table_size); 2814 if (xprt == NULL) { 2815 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2816 "rpc_xprt\n"); 2817 return ERR_PTR(-ENOMEM); 2818 } 2819 2820 new = container_of(xprt, struct sock_xprt, xprt); 2821 mutex_init(&new->recv_mutex); 2822 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2823 xprt->addrlen = args->addrlen; 2824 if (args->srcaddr) 2825 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2826 else { 2827 int err; 2828 err = xs_init_anyaddr(args->dstaddr->sa_family, 2829 (struct sockaddr *)&new->srcaddr); 2830 if (err != 0) { 2831 xprt_free(xprt); 2832 return ERR_PTR(err); 2833 } 2834 } 2835 2836 return xprt; 2837 } 2838 2839 static const struct rpc_timeout xs_local_default_timeout = { 2840 .to_initval = 10 * HZ, 2841 .to_maxval = 10 * HZ, 2842 .to_retries = 2, 2843 }; 2844 2845 /** 2846 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2847 * @args: rpc transport creation arguments 2848 * 2849 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2850 */ 2851 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2852 { 2853 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2854 struct sock_xprt *transport; 2855 struct rpc_xprt *xprt; 2856 struct rpc_xprt *ret; 2857 2858 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2859 xprt_max_tcp_slot_table_entries); 2860 if (IS_ERR(xprt)) 2861 return xprt; 2862 transport = container_of(xprt, struct sock_xprt, xprt); 2863 2864 xprt->prot = 0; 2865 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2866 2867 xprt->bind_timeout = XS_BIND_TO; 2868 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2869 xprt->idle_timeout = XS_IDLE_DISC_TO; 2870 2871 xprt->ops = &xs_local_ops; 2872 xprt->timeout = &xs_local_default_timeout; 2873 2874 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2875 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); 2876 2877 switch (sun->sun_family) { 2878 case AF_LOCAL: 2879 if (sun->sun_path[0] != '/') { 2880 dprintk("RPC: bad AF_LOCAL address: %s\n", 2881 sun->sun_path); 2882 ret = ERR_PTR(-EINVAL); 2883 goto out_err; 2884 } 2885 xprt_set_bound(xprt); 2886 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2887 ret = ERR_PTR(xs_local_setup_socket(transport)); 2888 if (ret) 2889 goto out_err; 2890 break; 2891 default: 2892 ret = ERR_PTR(-EAFNOSUPPORT); 2893 goto out_err; 2894 } 2895 2896 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2897 xprt->address_strings[RPC_DISPLAY_ADDR]); 2898 2899 if (try_module_get(THIS_MODULE)) 2900 return xprt; 2901 ret = ERR_PTR(-EINVAL); 2902 out_err: 2903 xs_xprt_free(xprt); 2904 return ret; 2905 } 2906 2907 static const struct rpc_timeout xs_udp_default_timeout = { 2908 .to_initval = 5 * HZ, 2909 .to_maxval = 30 * HZ, 2910 .to_increment = 5 * HZ, 2911 .to_retries = 5, 2912 }; 2913 2914 /** 2915 * xs_setup_udp - Set up transport to use a UDP socket 2916 * @args: rpc transport creation arguments 2917 * 2918 */ 2919 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2920 { 2921 struct sockaddr *addr = args->dstaddr; 2922 struct rpc_xprt *xprt; 2923 struct sock_xprt *transport; 2924 struct rpc_xprt *ret; 2925 2926 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2927 xprt_udp_slot_table_entries); 2928 if (IS_ERR(xprt)) 2929 return xprt; 2930 transport = container_of(xprt, struct sock_xprt, xprt); 2931 2932 xprt->prot = IPPROTO_UDP; 2933 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2934 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2935 2936 xprt->bind_timeout = XS_BIND_TO; 2937 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2938 xprt->idle_timeout = XS_IDLE_DISC_TO; 2939 2940 xprt->ops = &xs_udp_ops; 2941 2942 xprt->timeout = &xs_udp_default_timeout; 2943 2944 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2945 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2946 2947 switch (addr->sa_family) { 2948 case AF_INET: 2949 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2950 xprt_set_bound(xprt); 2951 2952 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2953 break; 2954 case AF_INET6: 2955 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2956 xprt_set_bound(xprt); 2957 2958 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2959 break; 2960 default: 2961 ret = ERR_PTR(-EAFNOSUPPORT); 2962 goto out_err; 2963 } 2964 2965 if (xprt_bound(xprt)) 2966 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2967 xprt->address_strings[RPC_DISPLAY_ADDR], 2968 xprt->address_strings[RPC_DISPLAY_PORT], 2969 xprt->address_strings[RPC_DISPLAY_PROTO]); 2970 else 2971 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2972 xprt->address_strings[RPC_DISPLAY_ADDR], 2973 xprt->address_strings[RPC_DISPLAY_PROTO]); 2974 2975 if (try_module_get(THIS_MODULE)) 2976 return xprt; 2977 ret = ERR_PTR(-EINVAL); 2978 out_err: 2979 xs_xprt_free(xprt); 2980 return ret; 2981 } 2982 2983 static const struct rpc_timeout xs_tcp_default_timeout = { 2984 .to_initval = 60 * HZ, 2985 .to_maxval = 60 * HZ, 2986 .to_retries = 2, 2987 }; 2988 2989 /** 2990 * xs_setup_tcp - Set up transport to use a TCP socket 2991 * @args: rpc transport creation arguments 2992 * 2993 */ 2994 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2995 { 2996 struct sockaddr *addr = args->dstaddr; 2997 struct rpc_xprt *xprt; 2998 struct sock_xprt *transport; 2999 struct rpc_xprt *ret; 3000 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 3001 3002 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 3003 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 3004 3005 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3006 max_slot_table_size); 3007 if (IS_ERR(xprt)) 3008 return xprt; 3009 transport = container_of(xprt, struct sock_xprt, xprt); 3010 3011 xprt->prot = IPPROTO_TCP; 3012 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3013 3014 xprt->bind_timeout = XS_BIND_TO; 3015 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3016 xprt->idle_timeout = XS_IDLE_DISC_TO; 3017 3018 xprt->ops = &xs_tcp_ops; 3019 xprt->timeout = &xs_tcp_default_timeout; 3020 3021 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3022 xprt->connect_timeout = xprt->timeout->to_initval * 3023 (xprt->timeout->to_retries + 1); 3024 3025 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 3026 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3027 3028 switch (addr->sa_family) { 3029 case AF_INET: 3030 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3031 xprt_set_bound(xprt); 3032 3033 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3034 break; 3035 case AF_INET6: 3036 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3037 xprt_set_bound(xprt); 3038 3039 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3040 break; 3041 default: 3042 ret = ERR_PTR(-EAFNOSUPPORT); 3043 goto out_err; 3044 } 3045 3046 if (xprt_bound(xprt)) 3047 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3048 xprt->address_strings[RPC_DISPLAY_ADDR], 3049 xprt->address_strings[RPC_DISPLAY_PORT], 3050 xprt->address_strings[RPC_DISPLAY_PROTO]); 3051 else 3052 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3053 xprt->address_strings[RPC_DISPLAY_ADDR], 3054 xprt->address_strings[RPC_DISPLAY_PROTO]); 3055 3056 if (try_module_get(THIS_MODULE)) 3057 return xprt; 3058 ret = ERR_PTR(-EINVAL); 3059 out_err: 3060 xs_xprt_free(xprt); 3061 return ret; 3062 } 3063 3064 /** 3065 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3066 * @args: rpc transport creation arguments 3067 * 3068 */ 3069 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3070 { 3071 struct sockaddr *addr = args->dstaddr; 3072 struct rpc_xprt *xprt; 3073 struct sock_xprt *transport; 3074 struct svc_sock *bc_sock; 3075 struct rpc_xprt *ret; 3076 3077 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3078 xprt_tcp_slot_table_entries); 3079 if (IS_ERR(xprt)) 3080 return xprt; 3081 transport = container_of(xprt, struct sock_xprt, xprt); 3082 3083 xprt->prot = IPPROTO_TCP; 3084 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3085 xprt->timeout = &xs_tcp_default_timeout; 3086 3087 /* backchannel */ 3088 xprt_set_bound(xprt); 3089 xprt->bind_timeout = 0; 3090 xprt->reestablish_timeout = 0; 3091 xprt->idle_timeout = 0; 3092 3093 xprt->ops = &bc_tcp_ops; 3094 3095 switch (addr->sa_family) { 3096 case AF_INET: 3097 xs_format_peer_addresses(xprt, "tcp", 3098 RPCBIND_NETID_TCP); 3099 break; 3100 case AF_INET6: 3101 xs_format_peer_addresses(xprt, "tcp", 3102 RPCBIND_NETID_TCP6); 3103 break; 3104 default: 3105 ret = ERR_PTR(-EAFNOSUPPORT); 3106 goto out_err; 3107 } 3108 3109 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3110 xprt->address_strings[RPC_DISPLAY_ADDR], 3111 xprt->address_strings[RPC_DISPLAY_PORT], 3112 xprt->address_strings[RPC_DISPLAY_PROTO]); 3113 3114 /* 3115 * Once we've associated a backchannel xprt with a connection, 3116 * we want to keep it around as long as the connection lasts, 3117 * in case we need to start using it for a backchannel again; 3118 * this reference won't be dropped until bc_xprt is destroyed. 3119 */ 3120 xprt_get(xprt); 3121 args->bc_xprt->xpt_bc_xprt = xprt; 3122 xprt->bc_xprt = args->bc_xprt; 3123 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3124 transport->sock = bc_sock->sk_sock; 3125 transport->inet = bc_sock->sk_sk; 3126 3127 /* 3128 * Since we don't want connections for the backchannel, we set 3129 * the xprt status to connected 3130 */ 3131 xprt_set_connected(xprt); 3132 3133 if (try_module_get(THIS_MODULE)) 3134 return xprt; 3135 3136 args->bc_xprt->xpt_bc_xprt = NULL; 3137 args->bc_xprt->xpt_bc_xps = NULL; 3138 xprt_put(xprt); 3139 ret = ERR_PTR(-EINVAL); 3140 out_err: 3141 xs_xprt_free(xprt); 3142 return ret; 3143 } 3144 3145 static struct xprt_class xs_local_transport = { 3146 .list = LIST_HEAD_INIT(xs_local_transport.list), 3147 .name = "named UNIX socket", 3148 .owner = THIS_MODULE, 3149 .ident = XPRT_TRANSPORT_LOCAL, 3150 .setup = xs_setup_local, 3151 }; 3152 3153 static struct xprt_class xs_udp_transport = { 3154 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3155 .name = "udp", 3156 .owner = THIS_MODULE, 3157 .ident = XPRT_TRANSPORT_UDP, 3158 .setup = xs_setup_udp, 3159 }; 3160 3161 static struct xprt_class xs_tcp_transport = { 3162 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3163 .name = "tcp", 3164 .owner = THIS_MODULE, 3165 .ident = XPRT_TRANSPORT_TCP, 3166 .setup = xs_setup_tcp, 3167 }; 3168 3169 static struct xprt_class xs_bc_tcp_transport = { 3170 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3171 .name = "tcp NFSv4.1 backchannel", 3172 .owner = THIS_MODULE, 3173 .ident = XPRT_TRANSPORT_BC_TCP, 3174 .setup = xs_setup_bc_tcp, 3175 }; 3176 3177 /** 3178 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3179 * 3180 */ 3181 int init_socket_xprt(void) 3182 { 3183 if (!sunrpc_table_header) 3184 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3185 3186 xprt_register_transport(&xs_local_transport); 3187 xprt_register_transport(&xs_udp_transport); 3188 xprt_register_transport(&xs_tcp_transport); 3189 xprt_register_transport(&xs_bc_tcp_transport); 3190 3191 return 0; 3192 } 3193 3194 /** 3195 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3196 * 3197 */ 3198 void cleanup_socket_xprt(void) 3199 { 3200 if (sunrpc_table_header) { 3201 unregister_sysctl_table(sunrpc_table_header); 3202 sunrpc_table_header = NULL; 3203 } 3204 3205 xprt_unregister_transport(&xs_local_transport); 3206 xprt_unregister_transport(&xs_udp_transport); 3207 xprt_unregister_transport(&xs_tcp_transport); 3208 xprt_unregister_transport(&xs_bc_tcp_transport); 3209 } 3210 3211 static int param_set_uint_minmax(const char *val, 3212 const struct kernel_param *kp, 3213 unsigned int min, unsigned int max) 3214 { 3215 unsigned int num; 3216 int ret; 3217 3218 if (!val) 3219 return -EINVAL; 3220 ret = kstrtouint(val, 0, &num); 3221 if (ret) 3222 return ret; 3223 if (num < min || num > max) 3224 return -EINVAL; 3225 *((unsigned int *)kp->arg) = num; 3226 return 0; 3227 } 3228 3229 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3230 { 3231 return param_set_uint_minmax(val, kp, 3232 RPC_MIN_RESVPORT, 3233 RPC_MAX_RESVPORT); 3234 } 3235 3236 static const struct kernel_param_ops param_ops_portnr = { 3237 .set = param_set_portnr, 3238 .get = param_get_uint, 3239 }; 3240 3241 #define param_check_portnr(name, p) \ 3242 __param_check(name, p, unsigned int); 3243 3244 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3245 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3246 3247 static int param_set_slot_table_size(const char *val, 3248 const struct kernel_param *kp) 3249 { 3250 return param_set_uint_minmax(val, kp, 3251 RPC_MIN_SLOT_TABLE, 3252 RPC_MAX_SLOT_TABLE); 3253 } 3254 3255 static const struct kernel_param_ops param_ops_slot_table_size = { 3256 .set = param_set_slot_table_size, 3257 .get = param_get_uint, 3258 }; 3259 3260 #define param_check_slot_table_size(name, p) \ 3261 __param_check(name, p, unsigned int); 3262 3263 static int param_set_max_slot_table_size(const char *val, 3264 const struct kernel_param *kp) 3265 { 3266 return param_set_uint_minmax(val, kp, 3267 RPC_MIN_SLOT_TABLE, 3268 RPC_MAX_SLOT_TABLE_LIMIT); 3269 } 3270 3271 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3272 .set = param_set_max_slot_table_size, 3273 .get = param_get_uint, 3274 }; 3275 3276 #define param_check_max_slot_table_size(name, p) \ 3277 __param_check(name, p, unsigned int); 3278 3279 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3280 slot_table_size, 0644); 3281 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3282 max_slot_table_size, 0644); 3283 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3284 slot_table_size, 0644); 3285