1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/net/sunrpc/xprtsock.c 4 * 5 * Client-side transport implementation for sockets. 6 * 7 * TCP callback races fixes (C) 1998 Red Hat 8 * TCP send fixes (C) 1998 Red Hat 9 * TCP NFS related read + write fixes 10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 11 * 12 * Rewrite of larges part of the code in order to stabilize TCP stuff. 13 * Fix behaviour when socket buffer is full. 14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 15 * 16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 17 * 18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 19 * <gilles.quillard@bull.net> 20 */ 21 22 #include <linux/types.h> 23 #include <linux/string.h> 24 #include <linux/slab.h> 25 #include <linux/module.h> 26 #include <linux/capability.h> 27 #include <linux/pagemap.h> 28 #include <linux/errno.h> 29 #include <linux/socket.h> 30 #include <linux/in.h> 31 #include <linux/net.h> 32 #include <linux/mm.h> 33 #include <linux/un.h> 34 #include <linux/udp.h> 35 #include <linux/tcp.h> 36 #include <linux/sunrpc/clnt.h> 37 #include <linux/sunrpc/addr.h> 38 #include <linux/sunrpc/sched.h> 39 #include <linux/sunrpc/svcsock.h> 40 #include <linux/sunrpc/xprtsock.h> 41 #include <linux/file.h> 42 #ifdef CONFIG_SUNRPC_BACKCHANNEL 43 #include <linux/sunrpc/bc_xprt.h> 44 #endif 45 46 #include <net/sock.h> 47 #include <net/checksum.h> 48 #include <net/udp.h> 49 #include <net/tcp.h> 50 #include <linux/bvec.h> 51 #include <linux/highmem.h> 52 #include <linux/uio.h> 53 #include <linux/sched/mm.h> 54 55 #include <trace/events/sunrpc.h> 56 57 #include "socklib.h" 58 #include "sunrpc.h" 59 60 static void xs_close(struct rpc_xprt *xprt); 61 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 62 struct socket *sock); 63 64 /* 65 * xprtsock tunables 66 */ 67 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 68 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 69 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 70 71 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 72 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 73 74 #define XS_TCP_LINGER_TO (15U * HZ) 75 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 76 77 /* 78 * We can register our own files under /proc/sys/sunrpc by 79 * calling register_sysctl_table() again. The files in that 80 * directory become the union of all files registered there. 81 * 82 * We simply need to make sure that we don't collide with 83 * someone else's file names! 84 */ 85 86 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 87 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 88 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 89 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 90 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 91 92 static struct ctl_table_header *sunrpc_table_header; 93 94 static struct xprt_class xs_local_transport; 95 static struct xprt_class xs_udp_transport; 96 static struct xprt_class xs_tcp_transport; 97 static struct xprt_class xs_bc_tcp_transport; 98 99 /* 100 * FIXME: changing the UDP slot table size should also resize the UDP 101 * socket buffers for existing UDP transports 102 */ 103 static struct ctl_table xs_tunables_table[] = { 104 { 105 .procname = "udp_slot_table_entries", 106 .data = &xprt_udp_slot_table_entries, 107 .maxlen = sizeof(unsigned int), 108 .mode = 0644, 109 .proc_handler = proc_dointvec_minmax, 110 .extra1 = &min_slot_table_size, 111 .extra2 = &max_slot_table_size 112 }, 113 { 114 .procname = "tcp_slot_table_entries", 115 .data = &xprt_tcp_slot_table_entries, 116 .maxlen = sizeof(unsigned int), 117 .mode = 0644, 118 .proc_handler = proc_dointvec_minmax, 119 .extra1 = &min_slot_table_size, 120 .extra2 = &max_slot_table_size 121 }, 122 { 123 .procname = "tcp_max_slot_table_entries", 124 .data = &xprt_max_tcp_slot_table_entries, 125 .maxlen = sizeof(unsigned int), 126 .mode = 0644, 127 .proc_handler = proc_dointvec_minmax, 128 .extra1 = &min_slot_table_size, 129 .extra2 = &max_tcp_slot_table_limit 130 }, 131 { 132 .procname = "min_resvport", 133 .data = &xprt_min_resvport, 134 .maxlen = sizeof(unsigned int), 135 .mode = 0644, 136 .proc_handler = proc_dointvec_minmax, 137 .extra1 = &xprt_min_resvport_limit, 138 .extra2 = &xprt_max_resvport_limit 139 }, 140 { 141 .procname = "max_resvport", 142 .data = &xprt_max_resvport, 143 .maxlen = sizeof(unsigned int), 144 .mode = 0644, 145 .proc_handler = proc_dointvec_minmax, 146 .extra1 = &xprt_min_resvport_limit, 147 .extra2 = &xprt_max_resvport_limit 148 }, 149 { 150 .procname = "tcp_fin_timeout", 151 .data = &xs_tcp_fin_timeout, 152 .maxlen = sizeof(xs_tcp_fin_timeout), 153 .mode = 0644, 154 .proc_handler = proc_dointvec_jiffies, 155 }, 156 { }, 157 }; 158 159 static struct ctl_table sunrpc_table[] = { 160 { 161 .procname = "sunrpc", 162 .mode = 0555, 163 .child = xs_tunables_table 164 }, 165 { }, 166 }; 167 168 /* 169 * Wait duration for a reply from the RPC portmapper. 170 */ 171 #define XS_BIND_TO (60U * HZ) 172 173 /* 174 * Delay if a UDP socket connect error occurs. This is most likely some 175 * kind of resource problem on the local host. 176 */ 177 #define XS_UDP_REEST_TO (2U * HZ) 178 179 /* 180 * The reestablish timeout allows clients to delay for a bit before attempting 181 * to reconnect to a server that just dropped our connection. 182 * 183 * We implement an exponential backoff when trying to reestablish a TCP 184 * transport connection with the server. Some servers like to drop a TCP 185 * connection when they are overworked, so we start with a short timeout and 186 * increase over time if the server is down or not responding. 187 */ 188 #define XS_TCP_INIT_REEST_TO (3U * HZ) 189 190 /* 191 * TCP idle timeout; client drops the transport socket if it is idle 192 * for this long. Note that we also timeout UDP sockets to prevent 193 * holding port numbers when there is no RPC traffic. 194 */ 195 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 196 197 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 198 # undef RPC_DEBUG_DATA 199 # define RPCDBG_FACILITY RPCDBG_TRANS 200 #endif 201 202 #ifdef RPC_DEBUG_DATA 203 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 204 { 205 u8 *buf = (u8 *) packet; 206 int j; 207 208 dprintk("RPC: %s\n", msg); 209 for (j = 0; j < count && j < 128; j += 4) { 210 if (!(j & 31)) { 211 if (j) 212 dprintk("\n"); 213 dprintk("0x%04x ", j); 214 } 215 dprintk("%02x%02x%02x%02x ", 216 buf[j], buf[j+1], buf[j+2], buf[j+3]); 217 } 218 dprintk("\n"); 219 } 220 #else 221 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 222 { 223 /* NOP */ 224 } 225 #endif 226 227 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 228 { 229 return (struct rpc_xprt *) sk->sk_user_data; 230 } 231 232 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 233 { 234 return (struct sockaddr *) &xprt->addr; 235 } 236 237 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 238 { 239 return (struct sockaddr_un *) &xprt->addr; 240 } 241 242 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 243 { 244 return (struct sockaddr_in *) &xprt->addr; 245 } 246 247 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 248 { 249 return (struct sockaddr_in6 *) &xprt->addr; 250 } 251 252 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 253 { 254 struct sockaddr *sap = xs_addr(xprt); 255 struct sockaddr_in6 *sin6; 256 struct sockaddr_in *sin; 257 struct sockaddr_un *sun; 258 char buf[128]; 259 260 switch (sap->sa_family) { 261 case AF_LOCAL: 262 sun = xs_addr_un(xprt); 263 strlcpy(buf, sun->sun_path, sizeof(buf)); 264 xprt->address_strings[RPC_DISPLAY_ADDR] = 265 kstrdup(buf, GFP_KERNEL); 266 break; 267 case AF_INET: 268 (void)rpc_ntop(sap, buf, sizeof(buf)); 269 xprt->address_strings[RPC_DISPLAY_ADDR] = 270 kstrdup(buf, GFP_KERNEL); 271 sin = xs_addr_in(xprt); 272 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 273 break; 274 case AF_INET6: 275 (void)rpc_ntop(sap, buf, sizeof(buf)); 276 xprt->address_strings[RPC_DISPLAY_ADDR] = 277 kstrdup(buf, GFP_KERNEL); 278 sin6 = xs_addr_in6(xprt); 279 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 280 break; 281 default: 282 BUG(); 283 } 284 285 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 286 } 287 288 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 289 { 290 struct sockaddr *sap = xs_addr(xprt); 291 char buf[128]; 292 293 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 294 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 295 296 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 297 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 298 } 299 300 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 301 const char *protocol, 302 const char *netid) 303 { 304 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 305 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 306 xs_format_common_peer_addresses(xprt); 307 xs_format_common_peer_ports(xprt); 308 } 309 310 static void xs_update_peer_port(struct rpc_xprt *xprt) 311 { 312 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 313 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 314 315 xs_format_common_peer_ports(xprt); 316 } 317 318 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 319 { 320 unsigned int i; 321 322 for (i = 0; i < RPC_DISPLAY_MAX; i++) 323 switch (i) { 324 case RPC_DISPLAY_PROTO: 325 case RPC_DISPLAY_NETID: 326 continue; 327 default: 328 kfree(xprt->address_strings[i]); 329 } 330 } 331 332 static size_t 333 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) 334 { 335 size_t i,n; 336 337 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) 338 return want; 339 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; 340 for (i = 0; i < n; i++) { 341 if (buf->pages[i]) 342 continue; 343 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); 344 if (!buf->pages[i]) { 345 i *= PAGE_SIZE; 346 return i > buf->page_base ? i - buf->page_base : 0; 347 } 348 } 349 return want; 350 } 351 352 static ssize_t 353 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) 354 { 355 ssize_t ret; 356 if (seek != 0) 357 iov_iter_advance(&msg->msg_iter, seek); 358 ret = sock_recvmsg(sock, msg, flags); 359 return ret > 0 ? ret + seek : ret; 360 } 361 362 static ssize_t 363 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, 364 struct kvec *kvec, size_t count, size_t seek) 365 { 366 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); 367 return xs_sock_recvmsg(sock, msg, flags, seek); 368 } 369 370 static ssize_t 371 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, 372 struct bio_vec *bvec, unsigned long nr, size_t count, 373 size_t seek) 374 { 375 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); 376 return xs_sock_recvmsg(sock, msg, flags, seek); 377 } 378 379 static ssize_t 380 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, 381 size_t count) 382 { 383 iov_iter_discard(&msg->msg_iter, READ, count); 384 return sock_recvmsg(sock, msg, flags); 385 } 386 387 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 388 static void 389 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 390 { 391 struct bvec_iter bi = { 392 .bi_size = count, 393 }; 394 struct bio_vec bv; 395 396 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); 397 for_each_bvec(bv, bvec, bi, bi) 398 flush_dcache_page(bv.bv_page); 399 } 400 #else 401 static inline void 402 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 403 { 404 } 405 #endif 406 407 static ssize_t 408 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, 409 struct xdr_buf *buf, size_t count, size_t seek, size_t *read) 410 { 411 size_t want, seek_init = seek, offset = 0; 412 ssize_t ret; 413 414 want = min_t(size_t, count, buf->head[0].iov_len); 415 if (seek < want) { 416 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); 417 if (ret <= 0) 418 goto sock_err; 419 offset += ret; 420 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 421 goto out; 422 if (ret != want) 423 goto out; 424 seek = 0; 425 } else { 426 seek -= want; 427 offset += want; 428 } 429 430 want = xs_alloc_sparse_pages(buf, 431 min_t(size_t, count - offset, buf->page_len), 432 GFP_KERNEL); 433 if (seek < want) { 434 ret = xs_read_bvec(sock, msg, flags, buf->bvec, 435 xdr_buf_pagecount(buf), 436 want + buf->page_base, 437 seek + buf->page_base); 438 if (ret <= 0) 439 goto sock_err; 440 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); 441 ret -= buf->page_base; 442 offset += ret; 443 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 444 goto out; 445 if (ret != want) 446 goto out; 447 seek = 0; 448 } else { 449 seek -= want; 450 offset += want; 451 } 452 453 want = min_t(size_t, count - offset, buf->tail[0].iov_len); 454 if (seek < want) { 455 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); 456 if (ret <= 0) 457 goto sock_err; 458 offset += ret; 459 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 460 goto out; 461 if (ret != want) 462 goto out; 463 } else if (offset < seek_init) 464 offset = seek_init; 465 ret = -EMSGSIZE; 466 out: 467 *read = offset - seek_init; 468 return ret; 469 sock_err: 470 offset += seek; 471 goto out; 472 } 473 474 static void 475 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) 476 { 477 if (!transport->recv.copied) { 478 if (buf->head[0].iov_len >= transport->recv.offset) 479 memcpy(buf->head[0].iov_base, 480 &transport->recv.xid, 481 transport->recv.offset); 482 transport->recv.copied = transport->recv.offset; 483 } 484 } 485 486 static bool 487 xs_read_stream_request_done(struct sock_xprt *transport) 488 { 489 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); 490 } 491 492 static void 493 xs_read_stream_check_eor(struct sock_xprt *transport, 494 struct msghdr *msg) 495 { 496 if (xs_read_stream_request_done(transport)) 497 msg->msg_flags |= MSG_EOR; 498 } 499 500 static ssize_t 501 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, 502 int flags, struct rpc_rqst *req) 503 { 504 struct xdr_buf *buf = &req->rq_private_buf; 505 size_t want, read; 506 ssize_t ret; 507 508 xs_read_header(transport, buf); 509 510 want = transport->recv.len - transport->recv.offset; 511 if (want != 0) { 512 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, 513 transport->recv.copied + want, 514 transport->recv.copied, 515 &read); 516 transport->recv.offset += read; 517 transport->recv.copied += read; 518 } 519 520 if (transport->recv.offset == transport->recv.len) 521 xs_read_stream_check_eor(transport, msg); 522 523 if (want == 0) 524 return 0; 525 526 switch (ret) { 527 default: 528 break; 529 case -EFAULT: 530 case -EMSGSIZE: 531 msg->msg_flags |= MSG_TRUNC; 532 return read; 533 case 0: 534 return -ESHUTDOWN; 535 } 536 return ret < 0 ? ret : read; 537 } 538 539 static size_t 540 xs_read_stream_headersize(bool isfrag) 541 { 542 if (isfrag) 543 return sizeof(__be32); 544 return 3 * sizeof(__be32); 545 } 546 547 static ssize_t 548 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, 549 int flags, size_t want, size_t seek) 550 { 551 struct kvec kvec = { 552 .iov_base = &transport->recv.fraghdr, 553 .iov_len = want, 554 }; 555 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); 556 } 557 558 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 559 static ssize_t 560 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 561 { 562 struct rpc_xprt *xprt = &transport->xprt; 563 struct rpc_rqst *req; 564 ssize_t ret; 565 566 /* Is this transport associated with the backchannel? */ 567 if (!xprt->bc_serv) 568 return -ESHUTDOWN; 569 570 /* Look up and lock the request corresponding to the given XID */ 571 req = xprt_lookup_bc_request(xprt, transport->recv.xid); 572 if (!req) { 573 printk(KERN_WARNING "Callback slot table overflowed\n"); 574 return -ESHUTDOWN; 575 } 576 if (transport->recv.copied && !req->rq_private_buf.len) 577 return -ESHUTDOWN; 578 579 ret = xs_read_stream_request(transport, msg, flags, req); 580 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 581 xprt_complete_bc_request(req, transport->recv.copied); 582 else 583 req->rq_private_buf.len = transport->recv.copied; 584 585 return ret; 586 } 587 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 588 static ssize_t 589 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 590 { 591 return -ESHUTDOWN; 592 } 593 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 594 595 static ssize_t 596 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) 597 { 598 struct rpc_xprt *xprt = &transport->xprt; 599 struct rpc_rqst *req; 600 ssize_t ret = 0; 601 602 /* Look up and lock the request corresponding to the given XID */ 603 spin_lock(&xprt->queue_lock); 604 req = xprt_lookup_rqst(xprt, transport->recv.xid); 605 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) { 606 msg->msg_flags |= MSG_TRUNC; 607 goto out; 608 } 609 xprt_pin_rqst(req); 610 spin_unlock(&xprt->queue_lock); 611 612 ret = xs_read_stream_request(transport, msg, flags, req); 613 614 spin_lock(&xprt->queue_lock); 615 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 616 xprt_complete_rqst(req->rq_task, transport->recv.copied); 617 else 618 req->rq_private_buf.len = transport->recv.copied; 619 xprt_unpin_rqst(req); 620 out: 621 spin_unlock(&xprt->queue_lock); 622 return ret; 623 } 624 625 static ssize_t 626 xs_read_stream(struct sock_xprt *transport, int flags) 627 { 628 struct msghdr msg = { 0 }; 629 size_t want, read = 0; 630 ssize_t ret = 0; 631 632 if (transport->recv.len == 0) { 633 want = xs_read_stream_headersize(transport->recv.copied != 0); 634 ret = xs_read_stream_header(transport, &msg, flags, want, 635 transport->recv.offset); 636 if (ret <= 0) 637 goto out_err; 638 transport->recv.offset = ret; 639 if (transport->recv.offset != want) 640 return transport->recv.offset; 641 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & 642 RPC_FRAGMENT_SIZE_MASK; 643 transport->recv.offset -= sizeof(transport->recv.fraghdr); 644 read = ret; 645 } 646 647 switch (be32_to_cpu(transport->recv.calldir)) { 648 default: 649 msg.msg_flags |= MSG_TRUNC; 650 break; 651 case RPC_CALL: 652 ret = xs_read_stream_call(transport, &msg, flags); 653 break; 654 case RPC_REPLY: 655 ret = xs_read_stream_reply(transport, &msg, flags); 656 } 657 if (msg.msg_flags & MSG_TRUNC) { 658 transport->recv.calldir = cpu_to_be32(-1); 659 transport->recv.copied = -1; 660 } 661 if (ret < 0) 662 goto out_err; 663 read += ret; 664 if (transport->recv.offset < transport->recv.len) { 665 if (!(msg.msg_flags & MSG_TRUNC)) 666 return read; 667 msg.msg_flags = 0; 668 ret = xs_read_discard(transport->sock, &msg, flags, 669 transport->recv.len - transport->recv.offset); 670 if (ret <= 0) 671 goto out_err; 672 transport->recv.offset += ret; 673 read += ret; 674 if (transport->recv.offset != transport->recv.len) 675 return read; 676 } 677 if (xs_read_stream_request_done(transport)) { 678 trace_xs_stream_read_request(transport); 679 transport->recv.copied = 0; 680 } 681 transport->recv.offset = 0; 682 transport->recv.len = 0; 683 return read; 684 out_err: 685 return ret != 0 ? ret : -ESHUTDOWN; 686 } 687 688 static __poll_t xs_poll_socket(struct sock_xprt *transport) 689 { 690 return transport->sock->ops->poll(transport->file, transport->sock, 691 NULL); 692 } 693 694 static bool xs_poll_socket_readable(struct sock_xprt *transport) 695 { 696 __poll_t events = xs_poll_socket(transport); 697 698 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); 699 } 700 701 static void xs_poll_check_readable(struct sock_xprt *transport) 702 { 703 704 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 705 if (!xs_poll_socket_readable(transport)) 706 return; 707 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 708 queue_work(xprtiod_workqueue, &transport->recv_worker); 709 } 710 711 static void xs_stream_data_receive(struct sock_xprt *transport) 712 { 713 size_t read = 0; 714 ssize_t ret = 0; 715 716 mutex_lock(&transport->recv_mutex); 717 if (transport->sock == NULL) 718 goto out; 719 for (;;) { 720 ret = xs_read_stream(transport, MSG_DONTWAIT); 721 if (ret < 0) 722 break; 723 read += ret; 724 cond_resched(); 725 } 726 if (ret == -ESHUTDOWN) 727 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 728 else 729 xs_poll_check_readable(transport); 730 out: 731 mutex_unlock(&transport->recv_mutex); 732 trace_xs_stream_read_data(&transport->xprt, ret, read); 733 } 734 735 static void xs_stream_data_receive_workfn(struct work_struct *work) 736 { 737 struct sock_xprt *transport = 738 container_of(work, struct sock_xprt, recv_worker); 739 unsigned int pflags = memalloc_nofs_save(); 740 741 xs_stream_data_receive(transport); 742 memalloc_nofs_restore(pflags); 743 } 744 745 static void 746 xs_stream_reset_connect(struct sock_xprt *transport) 747 { 748 transport->recv.offset = 0; 749 transport->recv.len = 0; 750 transport->recv.copied = 0; 751 transport->xmit.offset = 0; 752 } 753 754 static void 755 xs_stream_start_connect(struct sock_xprt *transport) 756 { 757 transport->xprt.stat.connect_count++; 758 transport->xprt.stat.connect_start = jiffies; 759 } 760 761 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 762 763 /** 764 * xs_nospace - handle transmit was incomplete 765 * @req: pointer to RPC request 766 * 767 */ 768 static int xs_nospace(struct rpc_rqst *req) 769 { 770 struct rpc_xprt *xprt = req->rq_xprt; 771 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 772 struct sock *sk = transport->inet; 773 int ret = -EAGAIN; 774 775 trace_rpc_socket_nospace(req, transport); 776 777 /* Protect against races with write_space */ 778 spin_lock(&xprt->transport_lock); 779 780 /* Don't race with disconnect */ 781 if (xprt_connected(xprt)) { 782 /* wait for more buffer space */ 783 sk->sk_write_pending++; 784 xprt_wait_for_buffer_space(xprt); 785 } else 786 ret = -ENOTCONN; 787 788 spin_unlock(&xprt->transport_lock); 789 790 /* Race breaker in case memory is freed before above code is called */ 791 if (ret == -EAGAIN) { 792 struct socket_wq *wq; 793 794 rcu_read_lock(); 795 wq = rcu_dereference(sk->sk_wq); 796 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); 797 rcu_read_unlock(); 798 799 sk->sk_write_space(sk); 800 } 801 return ret; 802 } 803 804 static void 805 xs_stream_prepare_request(struct rpc_rqst *req) 806 { 807 xdr_free_bvec(&req->rq_rcv_buf); 808 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL); 809 } 810 811 /* 812 * Determine if the previous message in the stream was aborted before it 813 * could complete transmission. 814 */ 815 static bool 816 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) 817 { 818 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; 819 } 820 821 /* 822 * Return the stream record marker field for a record of length < 2^31-1 823 */ 824 static rpc_fraghdr 825 xs_stream_record_marker(struct xdr_buf *xdr) 826 { 827 if (!xdr->len) 828 return 0; 829 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); 830 } 831 832 /** 833 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 834 * @req: pointer to RPC request 835 * 836 * Return values: 837 * 0: The request has been sent 838 * EAGAIN: The socket was blocked, please call again later to 839 * complete the request 840 * ENOTCONN: Caller needs to invoke connect logic then call again 841 * other: Some other error occurred, the request was not sent 842 */ 843 static int xs_local_send_request(struct rpc_rqst *req) 844 { 845 struct rpc_xprt *xprt = req->rq_xprt; 846 struct sock_xprt *transport = 847 container_of(xprt, struct sock_xprt, xprt); 848 struct xdr_buf *xdr = &req->rq_snd_buf; 849 rpc_fraghdr rm = xs_stream_record_marker(xdr); 850 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 851 struct msghdr msg = { 852 .msg_flags = XS_SENDMSG_FLAGS, 853 }; 854 unsigned int sent; 855 int status; 856 857 /* Close the stream if the previous transmission was incomplete */ 858 if (xs_send_request_was_aborted(transport, req)) { 859 xs_close(xprt); 860 return -ENOTCONN; 861 } 862 863 xs_pktdump("packet data:", 864 req->rq_svec->iov_base, req->rq_svec->iov_len); 865 866 req->rq_xtime = ktime_get(); 867 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 868 transport->xmit.offset, rm, &sent); 869 dprintk("RPC: %s(%u) = %d\n", 870 __func__, xdr->len - transport->xmit.offset, status); 871 872 if (status == -EAGAIN && sock_writeable(transport->inet)) 873 status = -ENOBUFS; 874 875 if (likely(sent > 0) || status == 0) { 876 transport->xmit.offset += sent; 877 req->rq_bytes_sent = transport->xmit.offset; 878 if (likely(req->rq_bytes_sent >= msglen)) { 879 req->rq_xmit_bytes_sent += transport->xmit.offset; 880 transport->xmit.offset = 0; 881 return 0; 882 } 883 status = -EAGAIN; 884 } 885 886 switch (status) { 887 case -ENOBUFS: 888 break; 889 case -EAGAIN: 890 status = xs_nospace(req); 891 break; 892 default: 893 dprintk("RPC: sendmsg returned unrecognized error %d\n", 894 -status); 895 fallthrough; 896 case -EPIPE: 897 xs_close(xprt); 898 status = -ENOTCONN; 899 } 900 901 return status; 902 } 903 904 /** 905 * xs_udp_send_request - write an RPC request to a UDP socket 906 * @req: pointer to RPC request 907 * 908 * Return values: 909 * 0: The request has been sent 910 * EAGAIN: The socket was blocked, please call again later to 911 * complete the request 912 * ENOTCONN: Caller needs to invoke connect logic then call again 913 * other: Some other error occurred, the request was not sent 914 */ 915 static int xs_udp_send_request(struct rpc_rqst *req) 916 { 917 struct rpc_xprt *xprt = req->rq_xprt; 918 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 919 struct xdr_buf *xdr = &req->rq_snd_buf; 920 struct msghdr msg = { 921 .msg_name = xs_addr(xprt), 922 .msg_namelen = xprt->addrlen, 923 .msg_flags = XS_SENDMSG_FLAGS, 924 }; 925 unsigned int sent; 926 int status; 927 928 xs_pktdump("packet data:", 929 req->rq_svec->iov_base, 930 req->rq_svec->iov_len); 931 932 if (!xprt_bound(xprt)) 933 return -ENOTCONN; 934 935 if (!xprt_request_get_cong(xprt, req)) 936 return -EBADSLT; 937 938 req->rq_xtime = ktime_get(); 939 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent); 940 941 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 942 xdr->len, status); 943 944 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 945 if (status == -EPERM) 946 goto process_status; 947 948 if (status == -EAGAIN && sock_writeable(transport->inet)) 949 status = -ENOBUFS; 950 951 if (sent > 0 || status == 0) { 952 req->rq_xmit_bytes_sent += sent; 953 if (sent >= req->rq_slen) 954 return 0; 955 /* Still some bytes left; set up for a retry later. */ 956 status = -EAGAIN; 957 } 958 959 process_status: 960 switch (status) { 961 case -ENOTSOCK: 962 status = -ENOTCONN; 963 /* Should we call xs_close() here? */ 964 break; 965 case -EAGAIN: 966 status = xs_nospace(req); 967 break; 968 case -ENETUNREACH: 969 case -ENOBUFS: 970 case -EPIPE: 971 case -ECONNREFUSED: 972 case -EPERM: 973 /* When the server has died, an ICMP port unreachable message 974 * prompts ECONNREFUSED. */ 975 break; 976 default: 977 dprintk("RPC: sendmsg returned unrecognized error %d\n", 978 -status); 979 } 980 981 return status; 982 } 983 984 /** 985 * xs_tcp_send_request - write an RPC request to a TCP socket 986 * @req: pointer to RPC request 987 * 988 * Return values: 989 * 0: The request has been sent 990 * EAGAIN: The socket was blocked, please call again later to 991 * complete the request 992 * ENOTCONN: Caller needs to invoke connect logic then call again 993 * other: Some other error occurred, the request was not sent 994 * 995 * XXX: In the case of soft timeouts, should we eventually give up 996 * if sendmsg is not able to make progress? 997 */ 998 static int xs_tcp_send_request(struct rpc_rqst *req) 999 { 1000 struct rpc_xprt *xprt = req->rq_xprt; 1001 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1002 struct xdr_buf *xdr = &req->rq_snd_buf; 1003 rpc_fraghdr rm = xs_stream_record_marker(xdr); 1004 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 1005 struct msghdr msg = { 1006 .msg_flags = XS_SENDMSG_FLAGS, 1007 }; 1008 bool vm_wait = false; 1009 unsigned int sent; 1010 int status; 1011 1012 /* Close the stream if the previous transmission was incomplete */ 1013 if (xs_send_request_was_aborted(transport, req)) { 1014 if (transport->sock != NULL) 1015 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 1016 return -ENOTCONN; 1017 } 1018 if (!transport->inet) 1019 return -ENOTCONN; 1020 1021 xs_pktdump("packet data:", 1022 req->rq_svec->iov_base, 1023 req->rq_svec->iov_len); 1024 1025 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 1026 xs_tcp_set_socket_timeouts(xprt, transport->sock); 1027 1028 /* Continue transmitting the packet/record. We must be careful 1029 * to cope with writespace callbacks arriving _after_ we have 1030 * called sendmsg(). */ 1031 req->rq_xtime = ktime_get(); 1032 tcp_sock_set_cork(transport->inet, true); 1033 while (1) { 1034 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 1035 transport->xmit.offset, rm, &sent); 1036 1037 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 1038 xdr->len - transport->xmit.offset, status); 1039 1040 /* If we've sent the entire packet, immediately 1041 * reset the count of bytes sent. */ 1042 transport->xmit.offset += sent; 1043 req->rq_bytes_sent = transport->xmit.offset; 1044 if (likely(req->rq_bytes_sent >= msglen)) { 1045 req->rq_xmit_bytes_sent += transport->xmit.offset; 1046 transport->xmit.offset = 0; 1047 if (atomic_long_read(&xprt->xmit_queuelen) == 1) 1048 tcp_sock_set_cork(transport->inet, false); 1049 return 0; 1050 } 1051 1052 WARN_ON_ONCE(sent == 0 && status == 0); 1053 1054 if (status == -EAGAIN ) { 1055 /* 1056 * Return EAGAIN if we're sure we're hitting the 1057 * socket send buffer limits. 1058 */ 1059 if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 1060 break; 1061 /* 1062 * Did we hit a memory allocation failure? 1063 */ 1064 if (sent == 0) { 1065 status = -ENOBUFS; 1066 if (vm_wait) 1067 break; 1068 /* Retry, knowing now that we're below the 1069 * socket send buffer limit 1070 */ 1071 vm_wait = true; 1072 } 1073 continue; 1074 } 1075 if (status < 0) 1076 break; 1077 vm_wait = false; 1078 } 1079 1080 switch (status) { 1081 case -ENOTSOCK: 1082 status = -ENOTCONN; 1083 /* Should we call xs_close() here? */ 1084 break; 1085 case -EAGAIN: 1086 status = xs_nospace(req); 1087 break; 1088 case -ECONNRESET: 1089 case -ECONNREFUSED: 1090 case -ENOTCONN: 1091 case -EADDRINUSE: 1092 case -ENOBUFS: 1093 case -EPIPE: 1094 break; 1095 default: 1096 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1097 -status); 1098 } 1099 1100 return status; 1101 } 1102 1103 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1104 { 1105 transport->old_data_ready = sk->sk_data_ready; 1106 transport->old_state_change = sk->sk_state_change; 1107 transport->old_write_space = sk->sk_write_space; 1108 transport->old_error_report = sk->sk_error_report; 1109 } 1110 1111 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1112 { 1113 sk->sk_data_ready = transport->old_data_ready; 1114 sk->sk_state_change = transport->old_state_change; 1115 sk->sk_write_space = transport->old_write_space; 1116 sk->sk_error_report = transport->old_error_report; 1117 } 1118 1119 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 1120 { 1121 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1122 1123 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1124 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state); 1125 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state); 1126 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state); 1127 } 1128 1129 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr) 1130 { 1131 set_bit(nr, &transport->sock_state); 1132 queue_work(xprtiod_workqueue, &transport->error_worker); 1133 } 1134 1135 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1136 { 1137 smp_mb__before_atomic(); 1138 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1139 clear_bit(XPRT_CLOSING, &xprt->state); 1140 xs_sock_reset_state_flags(xprt); 1141 smp_mb__after_atomic(); 1142 } 1143 1144 /** 1145 * xs_error_report - callback to handle TCP socket state errors 1146 * @sk: socket 1147 * 1148 * Note: we don't call sock_error() since there may be a rpc_task 1149 * using the socket, and so we don't want to clear sk->sk_err. 1150 */ 1151 static void xs_error_report(struct sock *sk) 1152 { 1153 struct sock_xprt *transport; 1154 struct rpc_xprt *xprt; 1155 1156 read_lock_bh(&sk->sk_callback_lock); 1157 if (!(xprt = xprt_from_sock(sk))) 1158 goto out; 1159 1160 transport = container_of(xprt, struct sock_xprt, xprt); 1161 transport->xprt_err = -sk->sk_err; 1162 if (transport->xprt_err == 0) 1163 goto out; 1164 dprintk("RPC: xs_error_report client %p, error=%d...\n", 1165 xprt, -transport->xprt_err); 1166 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err); 1167 1168 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */ 1169 smp_mb__before_atomic(); 1170 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR); 1171 out: 1172 read_unlock_bh(&sk->sk_callback_lock); 1173 } 1174 1175 static void xs_reset_transport(struct sock_xprt *transport) 1176 { 1177 struct socket *sock = transport->sock; 1178 struct sock *sk = transport->inet; 1179 struct rpc_xprt *xprt = &transport->xprt; 1180 struct file *filp = transport->file; 1181 1182 if (sk == NULL) 1183 return; 1184 1185 if (atomic_read(&transport->xprt.swapper)) 1186 sk_clear_memalloc(sk); 1187 1188 kernel_sock_shutdown(sock, SHUT_RDWR); 1189 1190 mutex_lock(&transport->recv_mutex); 1191 write_lock_bh(&sk->sk_callback_lock); 1192 transport->inet = NULL; 1193 transport->sock = NULL; 1194 transport->file = NULL; 1195 1196 sk->sk_user_data = NULL; 1197 1198 xs_restore_old_callbacks(transport, sk); 1199 xprt_clear_connected(xprt); 1200 write_unlock_bh(&sk->sk_callback_lock); 1201 xs_sock_reset_connection_flags(xprt); 1202 /* Reset stream record info */ 1203 xs_stream_reset_connect(transport); 1204 mutex_unlock(&transport->recv_mutex); 1205 1206 trace_rpc_socket_close(xprt, sock); 1207 fput(filp); 1208 1209 xprt_disconnect_done(xprt); 1210 } 1211 1212 /** 1213 * xs_close - close a socket 1214 * @xprt: transport 1215 * 1216 * This is used when all requests are complete; ie, no DRC state remains 1217 * on the server we want to save. 1218 * 1219 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 1220 * xs_reset_transport() zeroing the socket from underneath a writer. 1221 */ 1222 static void xs_close(struct rpc_xprt *xprt) 1223 { 1224 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1225 1226 dprintk("RPC: xs_close xprt %p\n", xprt); 1227 1228 xs_reset_transport(transport); 1229 xprt->reestablish_timeout = 0; 1230 } 1231 1232 static void xs_inject_disconnect(struct rpc_xprt *xprt) 1233 { 1234 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 1235 xprt); 1236 xprt_disconnect_done(xprt); 1237 } 1238 1239 static void xs_xprt_free(struct rpc_xprt *xprt) 1240 { 1241 xs_free_peer_addresses(xprt); 1242 xprt_free(xprt); 1243 } 1244 1245 /** 1246 * xs_destroy - prepare to shutdown a transport 1247 * @xprt: doomed transport 1248 * 1249 */ 1250 static void xs_destroy(struct rpc_xprt *xprt) 1251 { 1252 struct sock_xprt *transport = container_of(xprt, 1253 struct sock_xprt, xprt); 1254 dprintk("RPC: xs_destroy xprt %p\n", xprt); 1255 1256 cancel_delayed_work_sync(&transport->connect_worker); 1257 xs_close(xprt); 1258 cancel_work_sync(&transport->recv_worker); 1259 cancel_work_sync(&transport->error_worker); 1260 xs_xprt_free(xprt); 1261 module_put(THIS_MODULE); 1262 } 1263 1264 /** 1265 * xs_udp_data_read_skb - receive callback for UDP sockets 1266 * @xprt: transport 1267 * @sk: socket 1268 * @skb: skbuff 1269 * 1270 */ 1271 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1272 struct sock *sk, 1273 struct sk_buff *skb) 1274 { 1275 struct rpc_task *task; 1276 struct rpc_rqst *rovr; 1277 int repsize, copied; 1278 u32 _xid; 1279 __be32 *xp; 1280 1281 repsize = skb->len; 1282 if (repsize < 4) { 1283 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1284 return; 1285 } 1286 1287 /* Copy the XID from the skb... */ 1288 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1289 if (xp == NULL) 1290 return; 1291 1292 /* Look up and lock the request corresponding to the given XID */ 1293 spin_lock(&xprt->queue_lock); 1294 rovr = xprt_lookup_rqst(xprt, *xp); 1295 if (!rovr) 1296 goto out_unlock; 1297 xprt_pin_rqst(rovr); 1298 xprt_update_rtt(rovr->rq_task); 1299 spin_unlock(&xprt->queue_lock); 1300 task = rovr->rq_task; 1301 1302 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1303 copied = repsize; 1304 1305 /* Suck it into the iovec, verify checksum if not done by hw. */ 1306 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1307 spin_lock(&xprt->queue_lock); 1308 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1309 goto out_unpin; 1310 } 1311 1312 1313 spin_lock(&xprt->transport_lock); 1314 xprt_adjust_cwnd(xprt, task, copied); 1315 spin_unlock(&xprt->transport_lock); 1316 spin_lock(&xprt->queue_lock); 1317 xprt_complete_rqst(task, copied); 1318 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1319 out_unpin: 1320 xprt_unpin_rqst(rovr); 1321 out_unlock: 1322 spin_unlock(&xprt->queue_lock); 1323 } 1324 1325 static void xs_udp_data_receive(struct sock_xprt *transport) 1326 { 1327 struct sk_buff *skb; 1328 struct sock *sk; 1329 int err; 1330 1331 mutex_lock(&transport->recv_mutex); 1332 sk = transport->inet; 1333 if (sk == NULL) 1334 goto out; 1335 for (;;) { 1336 skb = skb_recv_udp(sk, 0, 1, &err); 1337 if (skb == NULL) 1338 break; 1339 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1340 consume_skb(skb); 1341 cond_resched(); 1342 } 1343 xs_poll_check_readable(transport); 1344 out: 1345 mutex_unlock(&transport->recv_mutex); 1346 } 1347 1348 static void xs_udp_data_receive_workfn(struct work_struct *work) 1349 { 1350 struct sock_xprt *transport = 1351 container_of(work, struct sock_xprt, recv_worker); 1352 unsigned int pflags = memalloc_nofs_save(); 1353 1354 xs_udp_data_receive(transport); 1355 memalloc_nofs_restore(pflags); 1356 } 1357 1358 /** 1359 * xs_data_ready - "data ready" callback for UDP sockets 1360 * @sk: socket with data to read 1361 * 1362 */ 1363 static void xs_data_ready(struct sock *sk) 1364 { 1365 struct rpc_xprt *xprt; 1366 1367 read_lock_bh(&sk->sk_callback_lock); 1368 dprintk("RPC: xs_data_ready...\n"); 1369 xprt = xprt_from_sock(sk); 1370 if (xprt != NULL) { 1371 struct sock_xprt *transport = container_of(xprt, 1372 struct sock_xprt, xprt); 1373 transport->old_data_ready(sk); 1374 /* Any data means we had a useful conversation, so 1375 * then we don't need to delay the next reconnect 1376 */ 1377 if (xprt->reestablish_timeout) 1378 xprt->reestablish_timeout = 0; 1379 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1380 queue_work(xprtiod_workqueue, &transport->recv_worker); 1381 } 1382 read_unlock_bh(&sk->sk_callback_lock); 1383 } 1384 1385 /* 1386 * Helper function to force a TCP close if the server is sending 1387 * junk and/or it has put us in CLOSE_WAIT 1388 */ 1389 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1390 { 1391 xprt_force_disconnect(xprt); 1392 } 1393 1394 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1395 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1396 { 1397 return PAGE_SIZE; 1398 } 1399 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1400 1401 /** 1402 * xs_tcp_state_change - callback to handle TCP socket state changes 1403 * @sk: socket whose state has changed 1404 * 1405 */ 1406 static void xs_tcp_state_change(struct sock *sk) 1407 { 1408 struct rpc_xprt *xprt; 1409 struct sock_xprt *transport; 1410 1411 read_lock_bh(&sk->sk_callback_lock); 1412 if (!(xprt = xprt_from_sock(sk))) 1413 goto out; 1414 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1415 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1416 sk->sk_state, xprt_connected(xprt), 1417 sock_flag(sk, SOCK_DEAD), 1418 sock_flag(sk, SOCK_ZAPPED), 1419 sk->sk_shutdown); 1420 1421 transport = container_of(xprt, struct sock_xprt, xprt); 1422 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1423 switch (sk->sk_state) { 1424 case TCP_ESTABLISHED: 1425 if (!xprt_test_and_set_connected(xprt)) { 1426 xprt->connect_cookie++; 1427 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1428 xprt_clear_connecting(xprt); 1429 1430 xprt->stat.connect_count++; 1431 xprt->stat.connect_time += (long)jiffies - 1432 xprt->stat.connect_start; 1433 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING); 1434 } 1435 break; 1436 case TCP_FIN_WAIT1: 1437 /* The client initiated a shutdown of the socket */ 1438 xprt->connect_cookie++; 1439 xprt->reestablish_timeout = 0; 1440 set_bit(XPRT_CLOSING, &xprt->state); 1441 smp_mb__before_atomic(); 1442 clear_bit(XPRT_CONNECTED, &xprt->state); 1443 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1444 smp_mb__after_atomic(); 1445 break; 1446 case TCP_CLOSE_WAIT: 1447 /* The server initiated a shutdown of the socket */ 1448 xprt->connect_cookie++; 1449 clear_bit(XPRT_CONNECTED, &xprt->state); 1450 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1451 fallthrough; 1452 case TCP_CLOSING: 1453 /* 1454 * If the server closed down the connection, make sure that 1455 * we back off before reconnecting 1456 */ 1457 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1458 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1459 break; 1460 case TCP_LAST_ACK: 1461 set_bit(XPRT_CLOSING, &xprt->state); 1462 smp_mb__before_atomic(); 1463 clear_bit(XPRT_CONNECTED, &xprt->state); 1464 smp_mb__after_atomic(); 1465 break; 1466 case TCP_CLOSE: 1467 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1468 &transport->sock_state)) 1469 xprt_clear_connecting(xprt); 1470 clear_bit(XPRT_CLOSING, &xprt->state); 1471 /* Trigger the socket release */ 1472 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1473 } 1474 out: 1475 read_unlock_bh(&sk->sk_callback_lock); 1476 } 1477 1478 static void xs_write_space(struct sock *sk) 1479 { 1480 struct socket_wq *wq; 1481 struct sock_xprt *transport; 1482 struct rpc_xprt *xprt; 1483 1484 if (!sk->sk_socket) 1485 return; 1486 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1487 1488 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1489 return; 1490 transport = container_of(xprt, struct sock_xprt, xprt); 1491 rcu_read_lock(); 1492 wq = rcu_dereference(sk->sk_wq); 1493 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1494 goto out; 1495 1496 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE); 1497 sk->sk_write_pending--; 1498 out: 1499 rcu_read_unlock(); 1500 } 1501 1502 /** 1503 * xs_udp_write_space - callback invoked when socket buffer space 1504 * becomes available 1505 * @sk: socket whose state has changed 1506 * 1507 * Called when more output buffer space is available for this socket. 1508 * We try not to wake our writers until they can make "significant" 1509 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1510 * with a bunch of small requests. 1511 */ 1512 static void xs_udp_write_space(struct sock *sk) 1513 { 1514 read_lock_bh(&sk->sk_callback_lock); 1515 1516 /* from net/core/sock.c:sock_def_write_space */ 1517 if (sock_writeable(sk)) 1518 xs_write_space(sk); 1519 1520 read_unlock_bh(&sk->sk_callback_lock); 1521 } 1522 1523 /** 1524 * xs_tcp_write_space - callback invoked when socket buffer space 1525 * becomes available 1526 * @sk: socket whose state has changed 1527 * 1528 * Called when more output buffer space is available for this socket. 1529 * We try not to wake our writers until they can make "significant" 1530 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1531 * with a bunch of small requests. 1532 */ 1533 static void xs_tcp_write_space(struct sock *sk) 1534 { 1535 read_lock_bh(&sk->sk_callback_lock); 1536 1537 /* from net/core/stream.c:sk_stream_write_space */ 1538 if (sk_stream_is_writeable(sk)) 1539 xs_write_space(sk); 1540 1541 read_unlock_bh(&sk->sk_callback_lock); 1542 } 1543 1544 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1545 { 1546 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1547 struct sock *sk = transport->inet; 1548 1549 if (transport->rcvsize) { 1550 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1551 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1552 } 1553 if (transport->sndsize) { 1554 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1555 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1556 sk->sk_write_space(sk); 1557 } 1558 } 1559 1560 /** 1561 * xs_udp_set_buffer_size - set send and receive limits 1562 * @xprt: generic transport 1563 * @sndsize: requested size of send buffer, in bytes 1564 * @rcvsize: requested size of receive buffer, in bytes 1565 * 1566 * Set socket send and receive buffer size limits. 1567 */ 1568 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1569 { 1570 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1571 1572 transport->sndsize = 0; 1573 if (sndsize) 1574 transport->sndsize = sndsize + 1024; 1575 transport->rcvsize = 0; 1576 if (rcvsize) 1577 transport->rcvsize = rcvsize + 1024; 1578 1579 xs_udp_do_set_buffer_size(xprt); 1580 } 1581 1582 /** 1583 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1584 * @xprt: controlling transport 1585 * @task: task that timed out 1586 * 1587 * Adjust the congestion window after a retransmit timeout has occurred. 1588 */ 1589 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1590 { 1591 spin_lock(&xprt->transport_lock); 1592 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1593 spin_unlock(&xprt->transport_lock); 1594 } 1595 1596 static int xs_get_random_port(void) 1597 { 1598 unsigned short min = xprt_min_resvport, max = xprt_max_resvport; 1599 unsigned short range; 1600 unsigned short rand; 1601 1602 if (max < min) 1603 return -EADDRINUSE; 1604 range = max - min + 1; 1605 rand = (unsigned short) prandom_u32() % range; 1606 return rand + min; 1607 } 1608 1609 static unsigned short xs_sock_getport(struct socket *sock) 1610 { 1611 struct sockaddr_storage buf; 1612 unsigned short port = 0; 1613 1614 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) 1615 goto out; 1616 switch (buf.ss_family) { 1617 case AF_INET6: 1618 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1619 break; 1620 case AF_INET: 1621 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1622 } 1623 out: 1624 return port; 1625 } 1626 1627 /** 1628 * xs_set_port - reset the port number in the remote endpoint address 1629 * @xprt: generic transport 1630 * @port: new port number 1631 * 1632 */ 1633 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1634 { 1635 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1636 1637 rpc_set_port(xs_addr(xprt), port); 1638 xs_update_peer_port(xprt); 1639 } 1640 1641 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1642 { 1643 if (transport->srcport == 0 && transport->xprt.reuseport) 1644 transport->srcport = xs_sock_getport(sock); 1645 } 1646 1647 static int xs_get_srcport(struct sock_xprt *transport) 1648 { 1649 int port = transport->srcport; 1650 1651 if (port == 0 && transport->xprt.resvport) 1652 port = xs_get_random_port(); 1653 return port; 1654 } 1655 1656 unsigned short get_srcport(struct rpc_xprt *xprt) 1657 { 1658 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1659 return xs_sock_getport(sock->sock); 1660 } 1661 EXPORT_SYMBOL(get_srcport); 1662 1663 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1664 { 1665 if (transport->srcport != 0) 1666 transport->srcport = 0; 1667 if (!transport->xprt.resvport) 1668 return 0; 1669 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1670 return xprt_max_resvport; 1671 return --port; 1672 } 1673 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1674 { 1675 struct sockaddr_storage myaddr; 1676 int err, nloop = 0; 1677 int port = xs_get_srcport(transport); 1678 unsigned short last; 1679 1680 /* 1681 * If we are asking for any ephemeral port (i.e. port == 0 && 1682 * transport->xprt.resvport == 0), don't bind. Let the local 1683 * port selection happen implicitly when the socket is used 1684 * (for example at connect time). 1685 * 1686 * This ensures that we can continue to establish TCP 1687 * connections even when all local ephemeral ports are already 1688 * a part of some TCP connection. This makes no difference 1689 * for UDP sockets, but also doesn't harm them. 1690 * 1691 * If we're asking for any reserved port (i.e. port == 0 && 1692 * transport->xprt.resvport == 1) xs_get_srcport above will 1693 * ensure that port is non-zero and we will bind as needed. 1694 */ 1695 if (port <= 0) 1696 return port; 1697 1698 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1699 do { 1700 rpc_set_port((struct sockaddr *)&myaddr, port); 1701 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1702 transport->xprt.addrlen); 1703 if (err == 0) { 1704 if (transport->xprt.reuseport) 1705 transport->srcport = port; 1706 break; 1707 } 1708 last = port; 1709 port = xs_next_srcport(transport, port); 1710 if (port > last) 1711 nloop++; 1712 } while (err == -EADDRINUSE && nloop != 2); 1713 1714 if (myaddr.ss_family == AF_INET) 1715 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1716 &((struct sockaddr_in *)&myaddr)->sin_addr, 1717 port, err ? "failed" : "ok", err); 1718 else 1719 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1720 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1721 port, err ? "failed" : "ok", err); 1722 return err; 1723 } 1724 1725 /* 1726 * We don't support autobind on AF_LOCAL sockets 1727 */ 1728 static void xs_local_rpcbind(struct rpc_task *task) 1729 { 1730 xprt_set_bound(task->tk_xprt); 1731 } 1732 1733 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1734 { 1735 } 1736 1737 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1738 static struct lock_class_key xs_key[2]; 1739 static struct lock_class_key xs_slock_key[2]; 1740 1741 static inline void xs_reclassify_socketu(struct socket *sock) 1742 { 1743 struct sock *sk = sock->sk; 1744 1745 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1746 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1747 } 1748 1749 static inline void xs_reclassify_socket4(struct socket *sock) 1750 { 1751 struct sock *sk = sock->sk; 1752 1753 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1754 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1755 } 1756 1757 static inline void xs_reclassify_socket6(struct socket *sock) 1758 { 1759 struct sock *sk = sock->sk; 1760 1761 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1762 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1763 } 1764 1765 static inline void xs_reclassify_socket(int family, struct socket *sock) 1766 { 1767 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1768 return; 1769 1770 switch (family) { 1771 case AF_LOCAL: 1772 xs_reclassify_socketu(sock); 1773 break; 1774 case AF_INET: 1775 xs_reclassify_socket4(sock); 1776 break; 1777 case AF_INET6: 1778 xs_reclassify_socket6(sock); 1779 break; 1780 } 1781 } 1782 #else 1783 static inline void xs_reclassify_socket(int family, struct socket *sock) 1784 { 1785 } 1786 #endif 1787 1788 static void xs_dummy_setup_socket(struct work_struct *work) 1789 { 1790 } 1791 1792 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1793 struct sock_xprt *transport, int family, int type, 1794 int protocol, bool reuseport) 1795 { 1796 struct file *filp; 1797 struct socket *sock; 1798 int err; 1799 1800 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1801 if (err < 0) { 1802 dprintk("RPC: can't create %d transport socket (%d).\n", 1803 protocol, -err); 1804 goto out; 1805 } 1806 xs_reclassify_socket(family, sock); 1807 1808 if (reuseport) 1809 sock_set_reuseport(sock->sk); 1810 1811 err = xs_bind(transport, sock); 1812 if (err) { 1813 sock_release(sock); 1814 goto out; 1815 } 1816 1817 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1818 if (IS_ERR(filp)) 1819 return ERR_CAST(filp); 1820 transport->file = filp; 1821 1822 return sock; 1823 out: 1824 return ERR_PTR(err); 1825 } 1826 1827 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1828 struct socket *sock) 1829 { 1830 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1831 xprt); 1832 1833 if (!transport->inet) { 1834 struct sock *sk = sock->sk; 1835 1836 write_lock_bh(&sk->sk_callback_lock); 1837 1838 xs_save_old_callbacks(transport, sk); 1839 1840 sk->sk_user_data = xprt; 1841 sk->sk_data_ready = xs_data_ready; 1842 sk->sk_write_space = xs_udp_write_space; 1843 sock_set_flag(sk, SOCK_FASYNC); 1844 sk->sk_error_report = xs_error_report; 1845 1846 xprt_clear_connected(xprt); 1847 1848 /* Reset to new socket */ 1849 transport->sock = sock; 1850 transport->inet = sk; 1851 1852 write_unlock_bh(&sk->sk_callback_lock); 1853 } 1854 1855 xs_stream_start_connect(transport); 1856 1857 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1858 } 1859 1860 /** 1861 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1862 * @transport: socket transport to connect 1863 */ 1864 static int xs_local_setup_socket(struct sock_xprt *transport) 1865 { 1866 struct rpc_xprt *xprt = &transport->xprt; 1867 struct file *filp; 1868 struct socket *sock; 1869 int status; 1870 1871 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1872 SOCK_STREAM, 0, &sock, 1); 1873 if (status < 0) { 1874 dprintk("RPC: can't create AF_LOCAL " 1875 "transport socket (%d).\n", -status); 1876 goto out; 1877 } 1878 xs_reclassify_socket(AF_LOCAL, sock); 1879 1880 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1881 if (IS_ERR(filp)) { 1882 status = PTR_ERR(filp); 1883 goto out; 1884 } 1885 transport->file = filp; 1886 1887 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1888 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1889 1890 status = xs_local_finish_connecting(xprt, sock); 1891 trace_rpc_socket_connect(xprt, sock, status); 1892 switch (status) { 1893 case 0: 1894 dprintk("RPC: xprt %p connected to %s\n", 1895 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1896 xprt->stat.connect_count++; 1897 xprt->stat.connect_time += (long)jiffies - 1898 xprt->stat.connect_start; 1899 xprt_set_connected(xprt); 1900 break; 1901 case -ENOBUFS: 1902 break; 1903 case -ENOENT: 1904 dprintk("RPC: xprt %p: socket %s does not exist\n", 1905 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1906 break; 1907 case -ECONNREFUSED: 1908 dprintk("RPC: xprt %p: connection refused for %s\n", 1909 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1910 break; 1911 default: 1912 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1913 __func__, -status, 1914 xprt->address_strings[RPC_DISPLAY_ADDR]); 1915 } 1916 1917 out: 1918 xprt_clear_connecting(xprt); 1919 xprt_wake_pending_tasks(xprt, status); 1920 return status; 1921 } 1922 1923 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1924 { 1925 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1926 int ret; 1927 1928 if (RPC_IS_ASYNC(task)) { 1929 /* 1930 * We want the AF_LOCAL connect to be resolved in the 1931 * filesystem namespace of the process making the rpc 1932 * call. Thus we connect synchronously. 1933 * 1934 * If we want to support asynchronous AF_LOCAL calls, 1935 * we'll need to figure out how to pass a namespace to 1936 * connect. 1937 */ 1938 task->tk_rpc_status = -ENOTCONN; 1939 rpc_exit(task, -ENOTCONN); 1940 return; 1941 } 1942 ret = xs_local_setup_socket(transport); 1943 if (ret && !RPC_IS_SOFTCONN(task)) 1944 msleep_interruptible(15000); 1945 } 1946 1947 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 1948 /* 1949 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 1950 * know that we have exclusive access to the socket), to guard against 1951 * races with xs_reset_transport. 1952 */ 1953 static void xs_set_memalloc(struct rpc_xprt *xprt) 1954 { 1955 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1956 xprt); 1957 1958 /* 1959 * If there's no sock, then we have nothing to set. The 1960 * reconnecting process will get it for us. 1961 */ 1962 if (!transport->inet) 1963 return; 1964 if (atomic_read(&xprt->swapper)) 1965 sk_set_memalloc(transport->inet); 1966 } 1967 1968 /** 1969 * xs_enable_swap - Tag this transport as being used for swap. 1970 * @xprt: transport to tag 1971 * 1972 * Take a reference to this transport on behalf of the rpc_clnt, and 1973 * optionally mark it for swapping if it wasn't already. 1974 */ 1975 static int 1976 xs_enable_swap(struct rpc_xprt *xprt) 1977 { 1978 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 1979 1980 if (atomic_inc_return(&xprt->swapper) != 1) 1981 return 0; 1982 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 1983 return -ERESTARTSYS; 1984 if (xs->inet) 1985 sk_set_memalloc(xs->inet); 1986 xprt_release_xprt(xprt, NULL); 1987 return 0; 1988 } 1989 1990 /** 1991 * xs_disable_swap - Untag this transport as being used for swap. 1992 * @xprt: transport to tag 1993 * 1994 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 1995 * swapper refcount goes to 0, untag the socket as a memalloc socket. 1996 */ 1997 static void 1998 xs_disable_swap(struct rpc_xprt *xprt) 1999 { 2000 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2001 2002 if (!atomic_dec_and_test(&xprt->swapper)) 2003 return; 2004 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2005 return; 2006 if (xs->inet) 2007 sk_clear_memalloc(xs->inet); 2008 xprt_release_xprt(xprt, NULL); 2009 } 2010 #else 2011 static void xs_set_memalloc(struct rpc_xprt *xprt) 2012 { 2013 } 2014 2015 static int 2016 xs_enable_swap(struct rpc_xprt *xprt) 2017 { 2018 return -EINVAL; 2019 } 2020 2021 static void 2022 xs_disable_swap(struct rpc_xprt *xprt) 2023 { 2024 } 2025 #endif 2026 2027 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2028 { 2029 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2030 2031 if (!transport->inet) { 2032 struct sock *sk = sock->sk; 2033 2034 write_lock_bh(&sk->sk_callback_lock); 2035 2036 xs_save_old_callbacks(transport, sk); 2037 2038 sk->sk_user_data = xprt; 2039 sk->sk_data_ready = xs_data_ready; 2040 sk->sk_write_space = xs_udp_write_space; 2041 sock_set_flag(sk, SOCK_FASYNC); 2042 2043 xprt_set_connected(xprt); 2044 2045 /* Reset to new socket */ 2046 transport->sock = sock; 2047 transport->inet = sk; 2048 2049 xs_set_memalloc(xprt); 2050 2051 write_unlock_bh(&sk->sk_callback_lock); 2052 } 2053 xs_udp_do_set_buffer_size(xprt); 2054 2055 xprt->stat.connect_start = jiffies; 2056 } 2057 2058 static void xs_udp_setup_socket(struct work_struct *work) 2059 { 2060 struct sock_xprt *transport = 2061 container_of(work, struct sock_xprt, connect_worker.work); 2062 struct rpc_xprt *xprt = &transport->xprt; 2063 struct socket *sock; 2064 int status = -EIO; 2065 2066 sock = xs_create_sock(xprt, transport, 2067 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2068 IPPROTO_UDP, false); 2069 if (IS_ERR(sock)) 2070 goto out; 2071 2072 dprintk("RPC: worker connecting xprt %p via %s to " 2073 "%s (port %s)\n", xprt, 2074 xprt->address_strings[RPC_DISPLAY_PROTO], 2075 xprt->address_strings[RPC_DISPLAY_ADDR], 2076 xprt->address_strings[RPC_DISPLAY_PORT]); 2077 2078 xs_udp_finish_connecting(xprt, sock); 2079 trace_rpc_socket_connect(xprt, sock, 0); 2080 status = 0; 2081 out: 2082 xprt_clear_connecting(xprt); 2083 xprt_unlock_connect(xprt, transport); 2084 xprt_wake_pending_tasks(xprt, status); 2085 } 2086 2087 /** 2088 * xs_tcp_shutdown - gracefully shut down a TCP socket 2089 * @xprt: transport 2090 * 2091 * Initiates a graceful shutdown of the TCP socket by calling the 2092 * equivalent of shutdown(SHUT_RDWR); 2093 */ 2094 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2095 { 2096 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2097 struct socket *sock = transport->sock; 2098 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; 2099 2100 if (sock == NULL) 2101 return; 2102 if (!xprt->reuseport) { 2103 xs_close(xprt); 2104 return; 2105 } 2106 switch (skst) { 2107 case TCP_FIN_WAIT1: 2108 case TCP_FIN_WAIT2: 2109 break; 2110 case TCP_ESTABLISHED: 2111 case TCP_CLOSE_WAIT: 2112 kernel_sock_shutdown(sock, SHUT_RDWR); 2113 trace_rpc_socket_shutdown(xprt, sock); 2114 break; 2115 default: 2116 xs_reset_transport(transport); 2117 } 2118 } 2119 2120 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2121 struct socket *sock) 2122 { 2123 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2124 unsigned int keepidle; 2125 unsigned int keepcnt; 2126 unsigned int timeo; 2127 2128 spin_lock(&xprt->transport_lock); 2129 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2130 keepcnt = xprt->timeout->to_retries + 1; 2131 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2132 (xprt->timeout->to_retries + 1); 2133 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2134 spin_unlock(&xprt->transport_lock); 2135 2136 /* TCP Keepalive options */ 2137 sock_set_keepalive(sock->sk); 2138 tcp_sock_set_keepidle(sock->sk, keepidle); 2139 tcp_sock_set_keepintvl(sock->sk, keepidle); 2140 tcp_sock_set_keepcnt(sock->sk, keepcnt); 2141 2142 /* TCP user timeout (see RFC5482) */ 2143 tcp_sock_set_user_timeout(sock->sk, timeo); 2144 } 2145 2146 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2147 unsigned long connect_timeout, 2148 unsigned long reconnect_timeout) 2149 { 2150 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2151 struct rpc_timeout to; 2152 unsigned long initval; 2153 2154 spin_lock(&xprt->transport_lock); 2155 if (reconnect_timeout < xprt->max_reconnect_timeout) 2156 xprt->max_reconnect_timeout = reconnect_timeout; 2157 if (connect_timeout < xprt->connect_timeout) { 2158 memcpy(&to, xprt->timeout, sizeof(to)); 2159 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2160 /* Arbitrary lower limit */ 2161 if (initval < XS_TCP_INIT_REEST_TO << 1) 2162 initval = XS_TCP_INIT_REEST_TO << 1; 2163 to.to_initval = initval; 2164 to.to_maxval = initval; 2165 memcpy(&transport->tcp_timeout, &to, 2166 sizeof(transport->tcp_timeout)); 2167 xprt->timeout = &transport->tcp_timeout; 2168 xprt->connect_timeout = connect_timeout; 2169 } 2170 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2171 spin_unlock(&xprt->transport_lock); 2172 } 2173 2174 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2175 { 2176 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2177 int ret = -ENOTCONN; 2178 2179 if (!transport->inet) { 2180 struct sock *sk = sock->sk; 2181 2182 /* Avoid temporary address, they are bad for long-lived 2183 * connections such as NFS mounts. 2184 * RFC4941, section 3.6 suggests that: 2185 * Individual applications, which have specific 2186 * knowledge about the normal duration of connections, 2187 * MAY override this as appropriate. 2188 */ 2189 if (xs_addr(xprt)->sa_family == PF_INET6) { 2190 ip6_sock_set_addr_preferences(sk, 2191 IPV6_PREFER_SRC_PUBLIC); 2192 } 2193 2194 xs_tcp_set_socket_timeouts(xprt, sock); 2195 tcp_sock_set_nodelay(sk); 2196 2197 write_lock_bh(&sk->sk_callback_lock); 2198 2199 xs_save_old_callbacks(transport, sk); 2200 2201 sk->sk_user_data = xprt; 2202 sk->sk_data_ready = xs_data_ready; 2203 sk->sk_state_change = xs_tcp_state_change; 2204 sk->sk_write_space = xs_tcp_write_space; 2205 sock_set_flag(sk, SOCK_FASYNC); 2206 sk->sk_error_report = xs_error_report; 2207 2208 /* socket options */ 2209 sock_reset_flag(sk, SOCK_LINGER); 2210 2211 xprt_clear_connected(xprt); 2212 2213 /* Reset to new socket */ 2214 transport->sock = sock; 2215 transport->inet = sk; 2216 2217 write_unlock_bh(&sk->sk_callback_lock); 2218 } 2219 2220 if (!xprt_bound(xprt)) 2221 goto out; 2222 2223 xs_set_memalloc(xprt); 2224 2225 xs_stream_start_connect(transport); 2226 2227 /* Tell the socket layer to start connecting... */ 2228 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2229 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2230 switch (ret) { 2231 case 0: 2232 xs_set_srcport(transport, sock); 2233 fallthrough; 2234 case -EINPROGRESS: 2235 /* SYN_SENT! */ 2236 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2237 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2238 break; 2239 case -EADDRNOTAVAIL: 2240 /* Source port number is unavailable. Try a new one! */ 2241 transport->srcport = 0; 2242 } 2243 out: 2244 return ret; 2245 } 2246 2247 /** 2248 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2249 * @work: queued work item 2250 * 2251 * Invoked by a work queue tasklet. 2252 */ 2253 static void xs_tcp_setup_socket(struct work_struct *work) 2254 { 2255 struct sock_xprt *transport = 2256 container_of(work, struct sock_xprt, connect_worker.work); 2257 struct socket *sock = transport->sock; 2258 struct rpc_xprt *xprt = &transport->xprt; 2259 int status = -EIO; 2260 2261 if (!sock) { 2262 sock = xs_create_sock(xprt, transport, 2263 xs_addr(xprt)->sa_family, SOCK_STREAM, 2264 IPPROTO_TCP, true); 2265 if (IS_ERR(sock)) { 2266 status = PTR_ERR(sock); 2267 goto out; 2268 } 2269 } 2270 2271 dprintk("RPC: worker connecting xprt %p via %s to " 2272 "%s (port %s)\n", xprt, 2273 xprt->address_strings[RPC_DISPLAY_PROTO], 2274 xprt->address_strings[RPC_DISPLAY_ADDR], 2275 xprt->address_strings[RPC_DISPLAY_PORT]); 2276 2277 status = xs_tcp_finish_connecting(xprt, sock); 2278 trace_rpc_socket_connect(xprt, sock, status); 2279 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2280 xprt, -status, xprt_connected(xprt), 2281 sock->sk->sk_state); 2282 switch (status) { 2283 default: 2284 printk("%s: connect returned unhandled error %d\n", 2285 __func__, status); 2286 fallthrough; 2287 case -EADDRNOTAVAIL: 2288 /* We're probably in TIME_WAIT. Get rid of existing socket, 2289 * and retry 2290 */ 2291 xs_tcp_force_close(xprt); 2292 break; 2293 case 0: 2294 case -EINPROGRESS: 2295 case -EALREADY: 2296 xprt_unlock_connect(xprt, transport); 2297 return; 2298 case -EINVAL: 2299 /* Happens, for instance, if the user specified a link 2300 * local IPv6 address without a scope-id. 2301 */ 2302 case -ECONNREFUSED: 2303 case -ECONNRESET: 2304 case -ENETDOWN: 2305 case -ENETUNREACH: 2306 case -EHOSTUNREACH: 2307 case -EADDRINUSE: 2308 case -ENOBUFS: 2309 /* xs_tcp_force_close() wakes tasks with a fixed error code. 2310 * We need to wake them first to ensure the correct error code. 2311 */ 2312 xprt_wake_pending_tasks(xprt, status); 2313 xs_tcp_force_close(xprt); 2314 goto out; 2315 } 2316 status = -EAGAIN; 2317 out: 2318 xprt_clear_connecting(xprt); 2319 xprt_unlock_connect(xprt, transport); 2320 xprt_wake_pending_tasks(xprt, status); 2321 } 2322 2323 /** 2324 * xs_connect - connect a socket to a remote endpoint 2325 * @xprt: pointer to transport structure 2326 * @task: address of RPC task that manages state of connect request 2327 * 2328 * TCP: If the remote end dropped the connection, delay reconnecting. 2329 * 2330 * UDP socket connects are synchronous, but we use a work queue anyway 2331 * to guarantee that even unprivileged user processes can set up a 2332 * socket on a privileged port. 2333 * 2334 * If a UDP socket connect fails, the delay behavior here prevents 2335 * retry floods (hard mounts). 2336 */ 2337 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2338 { 2339 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2340 unsigned long delay = 0; 2341 2342 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2343 2344 if (transport->sock != NULL) { 2345 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2346 "seconds\n", 2347 xprt, xprt->reestablish_timeout / HZ); 2348 2349 /* Start by resetting any existing state */ 2350 xs_reset_transport(transport); 2351 2352 delay = xprt_reconnect_delay(xprt); 2353 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); 2354 2355 } else 2356 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2357 2358 queue_delayed_work(xprtiod_workqueue, 2359 &transport->connect_worker, 2360 delay); 2361 } 2362 2363 static void xs_wake_disconnect(struct sock_xprt *transport) 2364 { 2365 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state)) 2366 xs_tcp_force_close(&transport->xprt); 2367 } 2368 2369 static void xs_wake_write(struct sock_xprt *transport) 2370 { 2371 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state)) 2372 xprt_write_space(&transport->xprt); 2373 } 2374 2375 static void xs_wake_error(struct sock_xprt *transport) 2376 { 2377 int sockerr; 2378 2379 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2380 return; 2381 mutex_lock(&transport->recv_mutex); 2382 if (transport->sock == NULL) 2383 goto out; 2384 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2385 goto out; 2386 sockerr = xchg(&transport->xprt_err, 0); 2387 if (sockerr < 0) 2388 xprt_wake_pending_tasks(&transport->xprt, sockerr); 2389 out: 2390 mutex_unlock(&transport->recv_mutex); 2391 } 2392 2393 static void xs_wake_pending(struct sock_xprt *transport) 2394 { 2395 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state)) 2396 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN); 2397 } 2398 2399 static void xs_error_handle(struct work_struct *work) 2400 { 2401 struct sock_xprt *transport = container_of(work, 2402 struct sock_xprt, error_worker); 2403 2404 xs_wake_disconnect(transport); 2405 xs_wake_write(transport); 2406 xs_wake_error(transport); 2407 xs_wake_pending(transport); 2408 } 2409 2410 /** 2411 * xs_local_print_stats - display AF_LOCAL socket-specific stats 2412 * @xprt: rpc_xprt struct containing statistics 2413 * @seq: output file 2414 * 2415 */ 2416 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2417 { 2418 long idle_time = 0; 2419 2420 if (xprt_connected(xprt)) 2421 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2422 2423 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2424 "%llu %llu %lu %llu %llu\n", 2425 xprt->stat.bind_count, 2426 xprt->stat.connect_count, 2427 xprt->stat.connect_time / HZ, 2428 idle_time, 2429 xprt->stat.sends, 2430 xprt->stat.recvs, 2431 xprt->stat.bad_xids, 2432 xprt->stat.req_u, 2433 xprt->stat.bklog_u, 2434 xprt->stat.max_slots, 2435 xprt->stat.sending_u, 2436 xprt->stat.pending_u); 2437 } 2438 2439 /** 2440 * xs_udp_print_stats - display UDP socket-specific stats 2441 * @xprt: rpc_xprt struct containing statistics 2442 * @seq: output file 2443 * 2444 */ 2445 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2446 { 2447 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2448 2449 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2450 "%lu %llu %llu\n", 2451 transport->srcport, 2452 xprt->stat.bind_count, 2453 xprt->stat.sends, 2454 xprt->stat.recvs, 2455 xprt->stat.bad_xids, 2456 xprt->stat.req_u, 2457 xprt->stat.bklog_u, 2458 xprt->stat.max_slots, 2459 xprt->stat.sending_u, 2460 xprt->stat.pending_u); 2461 } 2462 2463 /** 2464 * xs_tcp_print_stats - display TCP socket-specific stats 2465 * @xprt: rpc_xprt struct containing statistics 2466 * @seq: output file 2467 * 2468 */ 2469 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2470 { 2471 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2472 long idle_time = 0; 2473 2474 if (xprt_connected(xprt)) 2475 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2476 2477 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2478 "%llu %llu %lu %llu %llu\n", 2479 transport->srcport, 2480 xprt->stat.bind_count, 2481 xprt->stat.connect_count, 2482 xprt->stat.connect_time / HZ, 2483 idle_time, 2484 xprt->stat.sends, 2485 xprt->stat.recvs, 2486 xprt->stat.bad_xids, 2487 xprt->stat.req_u, 2488 xprt->stat.bklog_u, 2489 xprt->stat.max_slots, 2490 xprt->stat.sending_u, 2491 xprt->stat.pending_u); 2492 } 2493 2494 /* 2495 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2496 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2497 * to use the server side send routines. 2498 */ 2499 static int bc_malloc(struct rpc_task *task) 2500 { 2501 struct rpc_rqst *rqst = task->tk_rqstp; 2502 size_t size = rqst->rq_callsize; 2503 struct page *page; 2504 struct rpc_buffer *buf; 2505 2506 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2507 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2508 size); 2509 return -EINVAL; 2510 } 2511 2512 page = alloc_page(GFP_KERNEL); 2513 if (!page) 2514 return -ENOMEM; 2515 2516 buf = page_address(page); 2517 buf->len = PAGE_SIZE; 2518 2519 rqst->rq_buffer = buf->data; 2520 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2521 return 0; 2522 } 2523 2524 /* 2525 * Free the space allocated in the bc_alloc routine 2526 */ 2527 static void bc_free(struct rpc_task *task) 2528 { 2529 void *buffer = task->tk_rqstp->rq_buffer; 2530 struct rpc_buffer *buf; 2531 2532 buf = container_of(buffer, struct rpc_buffer, data); 2533 free_page((unsigned long)buf); 2534 } 2535 2536 static int bc_sendto(struct rpc_rqst *req) 2537 { 2538 struct xdr_buf *xdr = &req->rq_snd_buf; 2539 struct sock_xprt *transport = 2540 container_of(req->rq_xprt, struct sock_xprt, xprt); 2541 struct msghdr msg = { 2542 .msg_flags = 0, 2543 }; 2544 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | 2545 (u32)xdr->len); 2546 unsigned int sent = 0; 2547 int err; 2548 2549 req->rq_xtime = ktime_get(); 2550 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent); 2551 xdr_free_bvec(xdr); 2552 if (err < 0 || sent != (xdr->len + sizeof(marker))) 2553 return -EAGAIN; 2554 return sent; 2555 } 2556 2557 /** 2558 * bc_send_request - Send a backchannel Call on a TCP socket 2559 * @req: rpc_rqst containing Call message to be sent 2560 * 2561 * xpt_mutex ensures @rqstp's whole message is written to the socket 2562 * without interruption. 2563 * 2564 * Return values: 2565 * %0 if the message was sent successfully 2566 * %ENOTCONN if the message was not sent 2567 */ 2568 static int bc_send_request(struct rpc_rqst *req) 2569 { 2570 struct svc_xprt *xprt; 2571 int len; 2572 2573 /* 2574 * Get the server socket associated with this callback xprt 2575 */ 2576 xprt = req->rq_xprt->bc_xprt; 2577 2578 /* 2579 * Grab the mutex to serialize data as the connection is shared 2580 * with the fore channel 2581 */ 2582 mutex_lock(&xprt->xpt_mutex); 2583 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2584 len = -ENOTCONN; 2585 else 2586 len = bc_sendto(req); 2587 mutex_unlock(&xprt->xpt_mutex); 2588 2589 if (len > 0) 2590 len = 0; 2591 2592 return len; 2593 } 2594 2595 /* 2596 * The close routine. Since this is client initiated, we do nothing 2597 */ 2598 2599 static void bc_close(struct rpc_xprt *xprt) 2600 { 2601 xprt_disconnect_done(xprt); 2602 } 2603 2604 /* 2605 * The xprt destroy routine. Again, because this connection is client 2606 * initiated, we do nothing 2607 */ 2608 2609 static void bc_destroy(struct rpc_xprt *xprt) 2610 { 2611 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2612 2613 xs_xprt_free(xprt); 2614 module_put(THIS_MODULE); 2615 } 2616 2617 static const struct rpc_xprt_ops xs_local_ops = { 2618 .reserve_xprt = xprt_reserve_xprt, 2619 .release_xprt = xprt_release_xprt, 2620 .alloc_slot = xprt_alloc_slot, 2621 .free_slot = xprt_free_slot, 2622 .rpcbind = xs_local_rpcbind, 2623 .set_port = xs_local_set_port, 2624 .connect = xs_local_connect, 2625 .buf_alloc = rpc_malloc, 2626 .buf_free = rpc_free, 2627 .prepare_request = xs_stream_prepare_request, 2628 .send_request = xs_local_send_request, 2629 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2630 .close = xs_close, 2631 .destroy = xs_destroy, 2632 .print_stats = xs_local_print_stats, 2633 .enable_swap = xs_enable_swap, 2634 .disable_swap = xs_disable_swap, 2635 }; 2636 2637 static const struct rpc_xprt_ops xs_udp_ops = { 2638 .set_buffer_size = xs_udp_set_buffer_size, 2639 .reserve_xprt = xprt_reserve_xprt_cong, 2640 .release_xprt = xprt_release_xprt_cong, 2641 .alloc_slot = xprt_alloc_slot, 2642 .free_slot = xprt_free_slot, 2643 .rpcbind = rpcb_getport_async, 2644 .set_port = xs_set_port, 2645 .connect = xs_connect, 2646 .buf_alloc = rpc_malloc, 2647 .buf_free = rpc_free, 2648 .send_request = xs_udp_send_request, 2649 .wait_for_reply_request = xprt_wait_for_reply_request_rtt, 2650 .timer = xs_udp_timer, 2651 .release_request = xprt_release_rqst_cong, 2652 .close = xs_close, 2653 .destroy = xs_destroy, 2654 .print_stats = xs_udp_print_stats, 2655 .enable_swap = xs_enable_swap, 2656 .disable_swap = xs_disable_swap, 2657 .inject_disconnect = xs_inject_disconnect, 2658 }; 2659 2660 static const struct rpc_xprt_ops xs_tcp_ops = { 2661 .reserve_xprt = xprt_reserve_xprt, 2662 .release_xprt = xprt_release_xprt, 2663 .alloc_slot = xprt_alloc_slot, 2664 .free_slot = xprt_free_slot, 2665 .rpcbind = rpcb_getport_async, 2666 .set_port = xs_set_port, 2667 .connect = xs_connect, 2668 .buf_alloc = rpc_malloc, 2669 .buf_free = rpc_free, 2670 .prepare_request = xs_stream_prepare_request, 2671 .send_request = xs_tcp_send_request, 2672 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2673 .close = xs_tcp_shutdown, 2674 .destroy = xs_destroy, 2675 .set_connect_timeout = xs_tcp_set_connect_timeout, 2676 .print_stats = xs_tcp_print_stats, 2677 .enable_swap = xs_enable_swap, 2678 .disable_swap = xs_disable_swap, 2679 .inject_disconnect = xs_inject_disconnect, 2680 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2681 .bc_setup = xprt_setup_bc, 2682 .bc_maxpayload = xs_tcp_bc_maxpayload, 2683 .bc_num_slots = xprt_bc_max_slots, 2684 .bc_free_rqst = xprt_free_bc_rqst, 2685 .bc_destroy = xprt_destroy_bc, 2686 #endif 2687 }; 2688 2689 /* 2690 * The rpc_xprt_ops for the server backchannel 2691 */ 2692 2693 static const struct rpc_xprt_ops bc_tcp_ops = { 2694 .reserve_xprt = xprt_reserve_xprt, 2695 .release_xprt = xprt_release_xprt, 2696 .alloc_slot = xprt_alloc_slot, 2697 .free_slot = xprt_free_slot, 2698 .buf_alloc = bc_malloc, 2699 .buf_free = bc_free, 2700 .send_request = bc_send_request, 2701 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2702 .close = bc_close, 2703 .destroy = bc_destroy, 2704 .print_stats = xs_tcp_print_stats, 2705 .enable_swap = xs_enable_swap, 2706 .disable_swap = xs_disable_swap, 2707 .inject_disconnect = xs_inject_disconnect, 2708 }; 2709 2710 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2711 { 2712 static const struct sockaddr_in sin = { 2713 .sin_family = AF_INET, 2714 .sin_addr.s_addr = htonl(INADDR_ANY), 2715 }; 2716 static const struct sockaddr_in6 sin6 = { 2717 .sin6_family = AF_INET6, 2718 .sin6_addr = IN6ADDR_ANY_INIT, 2719 }; 2720 2721 switch (family) { 2722 case AF_LOCAL: 2723 break; 2724 case AF_INET: 2725 memcpy(sap, &sin, sizeof(sin)); 2726 break; 2727 case AF_INET6: 2728 memcpy(sap, &sin6, sizeof(sin6)); 2729 break; 2730 default: 2731 dprintk("RPC: %s: Bad address family\n", __func__); 2732 return -EAFNOSUPPORT; 2733 } 2734 return 0; 2735 } 2736 2737 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2738 unsigned int slot_table_size, 2739 unsigned int max_slot_table_size) 2740 { 2741 struct rpc_xprt *xprt; 2742 struct sock_xprt *new; 2743 2744 if (args->addrlen > sizeof(xprt->addr)) { 2745 dprintk("RPC: xs_setup_xprt: address too large\n"); 2746 return ERR_PTR(-EBADF); 2747 } 2748 2749 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2750 max_slot_table_size); 2751 if (xprt == NULL) { 2752 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2753 "rpc_xprt\n"); 2754 return ERR_PTR(-ENOMEM); 2755 } 2756 2757 new = container_of(xprt, struct sock_xprt, xprt); 2758 mutex_init(&new->recv_mutex); 2759 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2760 xprt->addrlen = args->addrlen; 2761 if (args->srcaddr) 2762 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2763 else { 2764 int err; 2765 err = xs_init_anyaddr(args->dstaddr->sa_family, 2766 (struct sockaddr *)&new->srcaddr); 2767 if (err != 0) { 2768 xprt_free(xprt); 2769 return ERR_PTR(err); 2770 } 2771 } 2772 2773 return xprt; 2774 } 2775 2776 static const struct rpc_timeout xs_local_default_timeout = { 2777 .to_initval = 10 * HZ, 2778 .to_maxval = 10 * HZ, 2779 .to_retries = 2, 2780 }; 2781 2782 /** 2783 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2784 * @args: rpc transport creation arguments 2785 * 2786 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2787 */ 2788 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2789 { 2790 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2791 struct sock_xprt *transport; 2792 struct rpc_xprt *xprt; 2793 struct rpc_xprt *ret; 2794 2795 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2796 xprt_max_tcp_slot_table_entries); 2797 if (IS_ERR(xprt)) 2798 return xprt; 2799 transport = container_of(xprt, struct sock_xprt, xprt); 2800 2801 xprt->prot = 0; 2802 xprt->xprt_class = &xs_local_transport; 2803 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2804 2805 xprt->bind_timeout = XS_BIND_TO; 2806 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2807 xprt->idle_timeout = XS_IDLE_DISC_TO; 2808 2809 xprt->ops = &xs_local_ops; 2810 xprt->timeout = &xs_local_default_timeout; 2811 2812 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2813 INIT_WORK(&transport->error_worker, xs_error_handle); 2814 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); 2815 2816 switch (sun->sun_family) { 2817 case AF_LOCAL: 2818 if (sun->sun_path[0] != '/') { 2819 dprintk("RPC: bad AF_LOCAL address: %s\n", 2820 sun->sun_path); 2821 ret = ERR_PTR(-EINVAL); 2822 goto out_err; 2823 } 2824 xprt_set_bound(xprt); 2825 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2826 ret = ERR_PTR(xs_local_setup_socket(transport)); 2827 if (ret) 2828 goto out_err; 2829 break; 2830 default: 2831 ret = ERR_PTR(-EAFNOSUPPORT); 2832 goto out_err; 2833 } 2834 2835 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2836 xprt->address_strings[RPC_DISPLAY_ADDR]); 2837 2838 if (try_module_get(THIS_MODULE)) 2839 return xprt; 2840 ret = ERR_PTR(-EINVAL); 2841 out_err: 2842 xs_xprt_free(xprt); 2843 return ret; 2844 } 2845 2846 static const struct rpc_timeout xs_udp_default_timeout = { 2847 .to_initval = 5 * HZ, 2848 .to_maxval = 30 * HZ, 2849 .to_increment = 5 * HZ, 2850 .to_retries = 5, 2851 }; 2852 2853 /** 2854 * xs_setup_udp - Set up transport to use a UDP socket 2855 * @args: rpc transport creation arguments 2856 * 2857 */ 2858 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2859 { 2860 struct sockaddr *addr = args->dstaddr; 2861 struct rpc_xprt *xprt; 2862 struct sock_xprt *transport; 2863 struct rpc_xprt *ret; 2864 2865 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2866 xprt_udp_slot_table_entries); 2867 if (IS_ERR(xprt)) 2868 return xprt; 2869 transport = container_of(xprt, struct sock_xprt, xprt); 2870 2871 xprt->prot = IPPROTO_UDP; 2872 xprt->xprt_class = &xs_udp_transport; 2873 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2874 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2875 2876 xprt->bind_timeout = XS_BIND_TO; 2877 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2878 xprt->idle_timeout = XS_IDLE_DISC_TO; 2879 2880 xprt->ops = &xs_udp_ops; 2881 2882 xprt->timeout = &xs_udp_default_timeout; 2883 2884 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2885 INIT_WORK(&transport->error_worker, xs_error_handle); 2886 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2887 2888 switch (addr->sa_family) { 2889 case AF_INET: 2890 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2891 xprt_set_bound(xprt); 2892 2893 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2894 break; 2895 case AF_INET6: 2896 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2897 xprt_set_bound(xprt); 2898 2899 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2900 break; 2901 default: 2902 ret = ERR_PTR(-EAFNOSUPPORT); 2903 goto out_err; 2904 } 2905 2906 if (xprt_bound(xprt)) 2907 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2908 xprt->address_strings[RPC_DISPLAY_ADDR], 2909 xprt->address_strings[RPC_DISPLAY_PORT], 2910 xprt->address_strings[RPC_DISPLAY_PROTO]); 2911 else 2912 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2913 xprt->address_strings[RPC_DISPLAY_ADDR], 2914 xprt->address_strings[RPC_DISPLAY_PROTO]); 2915 2916 if (try_module_get(THIS_MODULE)) 2917 return xprt; 2918 ret = ERR_PTR(-EINVAL); 2919 out_err: 2920 xs_xprt_free(xprt); 2921 return ret; 2922 } 2923 2924 static const struct rpc_timeout xs_tcp_default_timeout = { 2925 .to_initval = 60 * HZ, 2926 .to_maxval = 60 * HZ, 2927 .to_retries = 2, 2928 }; 2929 2930 /** 2931 * xs_setup_tcp - Set up transport to use a TCP socket 2932 * @args: rpc transport creation arguments 2933 * 2934 */ 2935 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2936 { 2937 struct sockaddr *addr = args->dstaddr; 2938 struct rpc_xprt *xprt; 2939 struct sock_xprt *transport; 2940 struct rpc_xprt *ret; 2941 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2942 2943 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2944 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2945 2946 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2947 max_slot_table_size); 2948 if (IS_ERR(xprt)) 2949 return xprt; 2950 transport = container_of(xprt, struct sock_xprt, xprt); 2951 2952 xprt->prot = IPPROTO_TCP; 2953 xprt->xprt_class = &xs_tcp_transport; 2954 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2955 2956 xprt->bind_timeout = XS_BIND_TO; 2957 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2958 xprt->idle_timeout = XS_IDLE_DISC_TO; 2959 2960 xprt->ops = &xs_tcp_ops; 2961 xprt->timeout = &xs_tcp_default_timeout; 2962 2963 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 2964 xprt->connect_timeout = xprt->timeout->to_initval * 2965 (xprt->timeout->to_retries + 1); 2966 2967 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2968 INIT_WORK(&transport->error_worker, xs_error_handle); 2969 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 2970 2971 switch (addr->sa_family) { 2972 case AF_INET: 2973 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2974 xprt_set_bound(xprt); 2975 2976 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 2977 break; 2978 case AF_INET6: 2979 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2980 xprt_set_bound(xprt); 2981 2982 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 2983 break; 2984 default: 2985 ret = ERR_PTR(-EAFNOSUPPORT); 2986 goto out_err; 2987 } 2988 2989 if (xprt_bound(xprt)) 2990 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2991 xprt->address_strings[RPC_DISPLAY_ADDR], 2992 xprt->address_strings[RPC_DISPLAY_PORT], 2993 xprt->address_strings[RPC_DISPLAY_PROTO]); 2994 else 2995 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2996 xprt->address_strings[RPC_DISPLAY_ADDR], 2997 xprt->address_strings[RPC_DISPLAY_PROTO]); 2998 2999 if (try_module_get(THIS_MODULE)) 3000 return xprt; 3001 ret = ERR_PTR(-EINVAL); 3002 out_err: 3003 xs_xprt_free(xprt); 3004 return ret; 3005 } 3006 3007 /** 3008 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3009 * @args: rpc transport creation arguments 3010 * 3011 */ 3012 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3013 { 3014 struct sockaddr *addr = args->dstaddr; 3015 struct rpc_xprt *xprt; 3016 struct sock_xprt *transport; 3017 struct svc_sock *bc_sock; 3018 struct rpc_xprt *ret; 3019 3020 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3021 xprt_tcp_slot_table_entries); 3022 if (IS_ERR(xprt)) 3023 return xprt; 3024 transport = container_of(xprt, struct sock_xprt, xprt); 3025 3026 xprt->prot = IPPROTO_TCP; 3027 xprt->xprt_class = &xs_bc_tcp_transport; 3028 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3029 xprt->timeout = &xs_tcp_default_timeout; 3030 3031 /* backchannel */ 3032 xprt_set_bound(xprt); 3033 xprt->bind_timeout = 0; 3034 xprt->reestablish_timeout = 0; 3035 xprt->idle_timeout = 0; 3036 3037 xprt->ops = &bc_tcp_ops; 3038 3039 switch (addr->sa_family) { 3040 case AF_INET: 3041 xs_format_peer_addresses(xprt, "tcp", 3042 RPCBIND_NETID_TCP); 3043 break; 3044 case AF_INET6: 3045 xs_format_peer_addresses(xprt, "tcp", 3046 RPCBIND_NETID_TCP6); 3047 break; 3048 default: 3049 ret = ERR_PTR(-EAFNOSUPPORT); 3050 goto out_err; 3051 } 3052 3053 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3054 xprt->address_strings[RPC_DISPLAY_ADDR], 3055 xprt->address_strings[RPC_DISPLAY_PORT], 3056 xprt->address_strings[RPC_DISPLAY_PROTO]); 3057 3058 /* 3059 * Once we've associated a backchannel xprt with a connection, 3060 * we want to keep it around as long as the connection lasts, 3061 * in case we need to start using it for a backchannel again; 3062 * this reference won't be dropped until bc_xprt is destroyed. 3063 */ 3064 xprt_get(xprt); 3065 args->bc_xprt->xpt_bc_xprt = xprt; 3066 xprt->bc_xprt = args->bc_xprt; 3067 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3068 transport->sock = bc_sock->sk_sock; 3069 transport->inet = bc_sock->sk_sk; 3070 3071 /* 3072 * Since we don't want connections for the backchannel, we set 3073 * the xprt status to connected 3074 */ 3075 xprt_set_connected(xprt); 3076 3077 if (try_module_get(THIS_MODULE)) 3078 return xprt; 3079 3080 args->bc_xprt->xpt_bc_xprt = NULL; 3081 args->bc_xprt->xpt_bc_xps = NULL; 3082 xprt_put(xprt); 3083 ret = ERR_PTR(-EINVAL); 3084 out_err: 3085 xs_xprt_free(xprt); 3086 return ret; 3087 } 3088 3089 static struct xprt_class xs_local_transport = { 3090 .list = LIST_HEAD_INIT(xs_local_transport.list), 3091 .name = "named UNIX socket", 3092 .owner = THIS_MODULE, 3093 .ident = XPRT_TRANSPORT_LOCAL, 3094 .setup = xs_setup_local, 3095 .netid = { "" }, 3096 }; 3097 3098 static struct xprt_class xs_udp_transport = { 3099 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3100 .name = "udp", 3101 .owner = THIS_MODULE, 3102 .ident = XPRT_TRANSPORT_UDP, 3103 .setup = xs_setup_udp, 3104 .netid = { "udp", "udp6", "" }, 3105 }; 3106 3107 static struct xprt_class xs_tcp_transport = { 3108 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3109 .name = "tcp", 3110 .owner = THIS_MODULE, 3111 .ident = XPRT_TRANSPORT_TCP, 3112 .setup = xs_setup_tcp, 3113 .netid = { "tcp", "tcp6", "" }, 3114 }; 3115 3116 static struct xprt_class xs_bc_tcp_transport = { 3117 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3118 .name = "tcp NFSv4.1 backchannel", 3119 .owner = THIS_MODULE, 3120 .ident = XPRT_TRANSPORT_BC_TCP, 3121 .setup = xs_setup_bc_tcp, 3122 .netid = { "" }, 3123 }; 3124 3125 /** 3126 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3127 * 3128 */ 3129 int init_socket_xprt(void) 3130 { 3131 if (!sunrpc_table_header) 3132 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3133 3134 xprt_register_transport(&xs_local_transport); 3135 xprt_register_transport(&xs_udp_transport); 3136 xprt_register_transport(&xs_tcp_transport); 3137 xprt_register_transport(&xs_bc_tcp_transport); 3138 3139 return 0; 3140 } 3141 3142 /** 3143 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3144 * 3145 */ 3146 void cleanup_socket_xprt(void) 3147 { 3148 if (sunrpc_table_header) { 3149 unregister_sysctl_table(sunrpc_table_header); 3150 sunrpc_table_header = NULL; 3151 } 3152 3153 xprt_unregister_transport(&xs_local_transport); 3154 xprt_unregister_transport(&xs_udp_transport); 3155 xprt_unregister_transport(&xs_tcp_transport); 3156 xprt_unregister_transport(&xs_bc_tcp_transport); 3157 } 3158 3159 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3160 { 3161 return param_set_uint_minmax(val, kp, 3162 RPC_MIN_RESVPORT, 3163 RPC_MAX_RESVPORT); 3164 } 3165 3166 static const struct kernel_param_ops param_ops_portnr = { 3167 .set = param_set_portnr, 3168 .get = param_get_uint, 3169 }; 3170 3171 #define param_check_portnr(name, p) \ 3172 __param_check(name, p, unsigned int); 3173 3174 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3175 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3176 3177 static int param_set_slot_table_size(const char *val, 3178 const struct kernel_param *kp) 3179 { 3180 return param_set_uint_minmax(val, kp, 3181 RPC_MIN_SLOT_TABLE, 3182 RPC_MAX_SLOT_TABLE); 3183 } 3184 3185 static const struct kernel_param_ops param_ops_slot_table_size = { 3186 .set = param_set_slot_table_size, 3187 .get = param_get_uint, 3188 }; 3189 3190 #define param_check_slot_table_size(name, p) \ 3191 __param_check(name, p, unsigned int); 3192 3193 static int param_set_max_slot_table_size(const char *val, 3194 const struct kernel_param *kp) 3195 { 3196 return param_set_uint_minmax(val, kp, 3197 RPC_MIN_SLOT_TABLE, 3198 RPC_MAX_SLOT_TABLE_LIMIT); 3199 } 3200 3201 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3202 .set = param_set_max_slot_table_size, 3203 .get = param_get_uint, 3204 }; 3205 3206 #define param_check_max_slot_table_size(name, p) \ 3207 __param_check(name, p, unsigned int); 3208 3209 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3210 slot_table_size, 0644); 3211 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3212 max_slot_table_size, 0644); 3213 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3214 slot_table_size, 0644); 3215