1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/net/sunrpc/xprtsock.c 4 * 5 * Client-side transport implementation for sockets. 6 * 7 * TCP callback races fixes (C) 1998 Red Hat 8 * TCP send fixes (C) 1998 Red Hat 9 * TCP NFS related read + write fixes 10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 11 * 12 * Rewrite of larges part of the code in order to stabilize TCP stuff. 13 * Fix behaviour when socket buffer is full. 14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 15 * 16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 17 * 18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 19 * <gilles.quillard@bull.net> 20 */ 21 22 #include <linux/types.h> 23 #include <linux/string.h> 24 #include <linux/slab.h> 25 #include <linux/module.h> 26 #include <linux/capability.h> 27 #include <linux/pagemap.h> 28 #include <linux/errno.h> 29 #include <linux/socket.h> 30 #include <linux/in.h> 31 #include <linux/net.h> 32 #include <linux/mm.h> 33 #include <linux/un.h> 34 #include <linux/udp.h> 35 #include <linux/tcp.h> 36 #include <linux/sunrpc/clnt.h> 37 #include <linux/sunrpc/addr.h> 38 #include <linux/sunrpc/sched.h> 39 #include <linux/sunrpc/svcsock.h> 40 #include <linux/sunrpc/xprtsock.h> 41 #include <linux/file.h> 42 #ifdef CONFIG_SUNRPC_BACKCHANNEL 43 #include <linux/sunrpc/bc_xprt.h> 44 #endif 45 46 #include <net/sock.h> 47 #include <net/checksum.h> 48 #include <net/udp.h> 49 #include <net/tcp.h> 50 #include <linux/bvec.h> 51 #include <linux/highmem.h> 52 #include <linux/uio.h> 53 #include <linux/sched/mm.h> 54 55 #include <trace/events/sunrpc.h> 56 57 #include "sunrpc.h" 58 59 static void xs_close(struct rpc_xprt *xprt); 60 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 61 struct socket *sock); 62 63 /* 64 * xprtsock tunables 65 */ 66 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 67 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 68 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 69 70 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 71 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 72 73 #define XS_TCP_LINGER_TO (15U * HZ) 74 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 75 76 /* 77 * We can register our own files under /proc/sys/sunrpc by 78 * calling register_sysctl_table() again. The files in that 79 * directory become the union of all files registered there. 80 * 81 * We simply need to make sure that we don't collide with 82 * someone else's file names! 83 */ 84 85 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 86 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 87 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 88 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 89 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 90 91 static struct ctl_table_header *sunrpc_table_header; 92 93 /* 94 * FIXME: changing the UDP slot table size should also resize the UDP 95 * socket buffers for existing UDP transports 96 */ 97 static struct ctl_table xs_tunables_table[] = { 98 { 99 .procname = "udp_slot_table_entries", 100 .data = &xprt_udp_slot_table_entries, 101 .maxlen = sizeof(unsigned int), 102 .mode = 0644, 103 .proc_handler = proc_dointvec_minmax, 104 .extra1 = &min_slot_table_size, 105 .extra2 = &max_slot_table_size 106 }, 107 { 108 .procname = "tcp_slot_table_entries", 109 .data = &xprt_tcp_slot_table_entries, 110 .maxlen = sizeof(unsigned int), 111 .mode = 0644, 112 .proc_handler = proc_dointvec_minmax, 113 .extra1 = &min_slot_table_size, 114 .extra2 = &max_slot_table_size 115 }, 116 { 117 .procname = "tcp_max_slot_table_entries", 118 .data = &xprt_max_tcp_slot_table_entries, 119 .maxlen = sizeof(unsigned int), 120 .mode = 0644, 121 .proc_handler = proc_dointvec_minmax, 122 .extra1 = &min_slot_table_size, 123 .extra2 = &max_tcp_slot_table_limit 124 }, 125 { 126 .procname = "min_resvport", 127 .data = &xprt_min_resvport, 128 .maxlen = sizeof(unsigned int), 129 .mode = 0644, 130 .proc_handler = proc_dointvec_minmax, 131 .extra1 = &xprt_min_resvport_limit, 132 .extra2 = &xprt_max_resvport_limit 133 }, 134 { 135 .procname = "max_resvport", 136 .data = &xprt_max_resvport, 137 .maxlen = sizeof(unsigned int), 138 .mode = 0644, 139 .proc_handler = proc_dointvec_minmax, 140 .extra1 = &xprt_min_resvport_limit, 141 .extra2 = &xprt_max_resvport_limit 142 }, 143 { 144 .procname = "tcp_fin_timeout", 145 .data = &xs_tcp_fin_timeout, 146 .maxlen = sizeof(xs_tcp_fin_timeout), 147 .mode = 0644, 148 .proc_handler = proc_dointvec_jiffies, 149 }, 150 { }, 151 }; 152 153 static struct ctl_table sunrpc_table[] = { 154 { 155 .procname = "sunrpc", 156 .mode = 0555, 157 .child = xs_tunables_table 158 }, 159 { }, 160 }; 161 162 /* 163 * Wait duration for a reply from the RPC portmapper. 164 */ 165 #define XS_BIND_TO (60U * HZ) 166 167 /* 168 * Delay if a UDP socket connect error occurs. This is most likely some 169 * kind of resource problem on the local host. 170 */ 171 #define XS_UDP_REEST_TO (2U * HZ) 172 173 /* 174 * The reestablish timeout allows clients to delay for a bit before attempting 175 * to reconnect to a server that just dropped our connection. 176 * 177 * We implement an exponential backoff when trying to reestablish a TCP 178 * transport connection with the server. Some servers like to drop a TCP 179 * connection when they are overworked, so we start with a short timeout and 180 * increase over time if the server is down or not responding. 181 */ 182 #define XS_TCP_INIT_REEST_TO (3U * HZ) 183 184 /* 185 * TCP idle timeout; client drops the transport socket if it is idle 186 * for this long. Note that we also timeout UDP sockets to prevent 187 * holding port numbers when there is no RPC traffic. 188 */ 189 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 190 191 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 192 # undef RPC_DEBUG_DATA 193 # define RPCDBG_FACILITY RPCDBG_TRANS 194 #endif 195 196 #ifdef RPC_DEBUG_DATA 197 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 198 { 199 u8 *buf = (u8 *) packet; 200 int j; 201 202 dprintk("RPC: %s\n", msg); 203 for (j = 0; j < count && j < 128; j += 4) { 204 if (!(j & 31)) { 205 if (j) 206 dprintk("\n"); 207 dprintk("0x%04x ", j); 208 } 209 dprintk("%02x%02x%02x%02x ", 210 buf[j], buf[j+1], buf[j+2], buf[j+3]); 211 } 212 dprintk("\n"); 213 } 214 #else 215 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 216 { 217 /* NOP */ 218 } 219 #endif 220 221 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 222 { 223 return (struct rpc_xprt *) sk->sk_user_data; 224 } 225 226 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 227 { 228 return (struct sockaddr *) &xprt->addr; 229 } 230 231 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 232 { 233 return (struct sockaddr_un *) &xprt->addr; 234 } 235 236 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 237 { 238 return (struct sockaddr_in *) &xprt->addr; 239 } 240 241 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 242 { 243 return (struct sockaddr_in6 *) &xprt->addr; 244 } 245 246 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 247 { 248 struct sockaddr *sap = xs_addr(xprt); 249 struct sockaddr_in6 *sin6; 250 struct sockaddr_in *sin; 251 struct sockaddr_un *sun; 252 char buf[128]; 253 254 switch (sap->sa_family) { 255 case AF_LOCAL: 256 sun = xs_addr_un(xprt); 257 strlcpy(buf, sun->sun_path, sizeof(buf)); 258 xprt->address_strings[RPC_DISPLAY_ADDR] = 259 kstrdup(buf, GFP_KERNEL); 260 break; 261 case AF_INET: 262 (void)rpc_ntop(sap, buf, sizeof(buf)); 263 xprt->address_strings[RPC_DISPLAY_ADDR] = 264 kstrdup(buf, GFP_KERNEL); 265 sin = xs_addr_in(xprt); 266 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 267 break; 268 case AF_INET6: 269 (void)rpc_ntop(sap, buf, sizeof(buf)); 270 xprt->address_strings[RPC_DISPLAY_ADDR] = 271 kstrdup(buf, GFP_KERNEL); 272 sin6 = xs_addr_in6(xprt); 273 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 274 break; 275 default: 276 BUG(); 277 } 278 279 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 280 } 281 282 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 283 { 284 struct sockaddr *sap = xs_addr(xprt); 285 char buf[128]; 286 287 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 288 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 289 290 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 291 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 292 } 293 294 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 295 const char *protocol, 296 const char *netid) 297 { 298 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 299 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 300 xs_format_common_peer_addresses(xprt); 301 xs_format_common_peer_ports(xprt); 302 } 303 304 static void xs_update_peer_port(struct rpc_xprt *xprt) 305 { 306 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 307 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 308 309 xs_format_common_peer_ports(xprt); 310 } 311 312 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 313 { 314 unsigned int i; 315 316 for (i = 0; i < RPC_DISPLAY_MAX; i++) 317 switch (i) { 318 case RPC_DISPLAY_PROTO: 319 case RPC_DISPLAY_NETID: 320 continue; 321 default: 322 kfree(xprt->address_strings[i]); 323 } 324 } 325 326 static size_t 327 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) 328 { 329 size_t i,n; 330 331 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) 332 return want; 333 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; 334 for (i = 0; i < n; i++) { 335 if (buf->pages[i]) 336 continue; 337 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); 338 if (!buf->pages[i]) { 339 i *= PAGE_SIZE; 340 return i > buf->page_base ? i - buf->page_base : 0; 341 } 342 } 343 return want; 344 } 345 346 static ssize_t 347 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) 348 { 349 ssize_t ret; 350 if (seek != 0) 351 iov_iter_advance(&msg->msg_iter, seek); 352 ret = sock_recvmsg(sock, msg, flags); 353 return ret > 0 ? ret + seek : ret; 354 } 355 356 static ssize_t 357 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, 358 struct kvec *kvec, size_t count, size_t seek) 359 { 360 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); 361 return xs_sock_recvmsg(sock, msg, flags, seek); 362 } 363 364 static ssize_t 365 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, 366 struct bio_vec *bvec, unsigned long nr, size_t count, 367 size_t seek) 368 { 369 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); 370 return xs_sock_recvmsg(sock, msg, flags, seek); 371 } 372 373 static ssize_t 374 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, 375 size_t count) 376 { 377 iov_iter_discard(&msg->msg_iter, READ, count); 378 return sock_recvmsg(sock, msg, flags); 379 } 380 381 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 382 static void 383 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 384 { 385 struct bvec_iter bi = { 386 .bi_size = count, 387 }; 388 struct bio_vec bv; 389 390 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); 391 for_each_bvec(bv, bvec, bi, bi) 392 flush_dcache_page(bv.bv_page); 393 } 394 #else 395 static inline void 396 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 397 { 398 } 399 #endif 400 401 static ssize_t 402 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, 403 struct xdr_buf *buf, size_t count, size_t seek, size_t *read) 404 { 405 size_t want, seek_init = seek, offset = 0; 406 ssize_t ret; 407 408 want = min_t(size_t, count, buf->head[0].iov_len); 409 if (seek < want) { 410 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); 411 if (ret <= 0) 412 goto sock_err; 413 offset += ret; 414 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 415 goto out; 416 if (ret != want) 417 goto out; 418 seek = 0; 419 } else { 420 seek -= want; 421 offset += want; 422 } 423 424 want = xs_alloc_sparse_pages(buf, 425 min_t(size_t, count - offset, buf->page_len), 426 GFP_KERNEL); 427 if (seek < want) { 428 ret = xs_read_bvec(sock, msg, flags, buf->bvec, 429 xdr_buf_pagecount(buf), 430 want + buf->page_base, 431 seek + buf->page_base); 432 if (ret <= 0) 433 goto sock_err; 434 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); 435 offset += ret - buf->page_base; 436 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 437 goto out; 438 if (ret != want) 439 goto out; 440 seek = 0; 441 } else { 442 seek -= want; 443 offset += want; 444 } 445 446 want = min_t(size_t, count - offset, buf->tail[0].iov_len); 447 if (seek < want) { 448 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); 449 if (ret <= 0) 450 goto sock_err; 451 offset += ret; 452 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 453 goto out; 454 if (ret != want) 455 goto out; 456 } else if (offset < seek_init) 457 offset = seek_init; 458 ret = -EMSGSIZE; 459 out: 460 *read = offset - seek_init; 461 return ret; 462 sock_err: 463 offset += seek; 464 goto out; 465 } 466 467 static void 468 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) 469 { 470 if (!transport->recv.copied) { 471 if (buf->head[0].iov_len >= transport->recv.offset) 472 memcpy(buf->head[0].iov_base, 473 &transport->recv.xid, 474 transport->recv.offset); 475 transport->recv.copied = transport->recv.offset; 476 } 477 } 478 479 static bool 480 xs_read_stream_request_done(struct sock_xprt *transport) 481 { 482 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); 483 } 484 485 static void 486 xs_read_stream_check_eor(struct sock_xprt *transport, 487 struct msghdr *msg) 488 { 489 if (xs_read_stream_request_done(transport)) 490 msg->msg_flags |= MSG_EOR; 491 } 492 493 static ssize_t 494 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, 495 int flags, struct rpc_rqst *req) 496 { 497 struct xdr_buf *buf = &req->rq_private_buf; 498 size_t want, uninitialized_var(read); 499 ssize_t uninitialized_var(ret); 500 501 xs_read_header(transport, buf); 502 503 want = transport->recv.len - transport->recv.offset; 504 if (want != 0) { 505 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, 506 transport->recv.copied + want, 507 transport->recv.copied, 508 &read); 509 transport->recv.offset += read; 510 transport->recv.copied += read; 511 } 512 513 if (transport->recv.offset == transport->recv.len) 514 xs_read_stream_check_eor(transport, msg); 515 516 if (want == 0) 517 return 0; 518 519 switch (ret) { 520 default: 521 break; 522 case -EFAULT: 523 case -EMSGSIZE: 524 msg->msg_flags |= MSG_TRUNC; 525 return read; 526 case 0: 527 return -ESHUTDOWN; 528 } 529 return ret < 0 ? ret : read; 530 } 531 532 static size_t 533 xs_read_stream_headersize(bool isfrag) 534 { 535 if (isfrag) 536 return sizeof(__be32); 537 return 3 * sizeof(__be32); 538 } 539 540 static ssize_t 541 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, 542 int flags, size_t want, size_t seek) 543 { 544 struct kvec kvec = { 545 .iov_base = &transport->recv.fraghdr, 546 .iov_len = want, 547 }; 548 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); 549 } 550 551 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 552 static ssize_t 553 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 554 { 555 struct rpc_xprt *xprt = &transport->xprt; 556 struct rpc_rqst *req; 557 ssize_t ret; 558 559 /* Look up and lock the request corresponding to the given XID */ 560 req = xprt_lookup_bc_request(xprt, transport->recv.xid); 561 if (!req) { 562 printk(KERN_WARNING "Callback slot table overflowed\n"); 563 return -ESHUTDOWN; 564 } 565 if (transport->recv.copied && !req->rq_private_buf.len) 566 return -ESHUTDOWN; 567 568 ret = xs_read_stream_request(transport, msg, flags, req); 569 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 570 xprt_complete_bc_request(req, transport->recv.copied); 571 else 572 req->rq_private_buf.len = transport->recv.copied; 573 574 return ret; 575 } 576 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 577 static ssize_t 578 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 579 { 580 return -ESHUTDOWN; 581 } 582 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 583 584 static ssize_t 585 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) 586 { 587 struct rpc_xprt *xprt = &transport->xprt; 588 struct rpc_rqst *req; 589 ssize_t ret = 0; 590 591 /* Look up and lock the request corresponding to the given XID */ 592 spin_lock(&xprt->queue_lock); 593 req = xprt_lookup_rqst(xprt, transport->recv.xid); 594 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) { 595 msg->msg_flags |= MSG_TRUNC; 596 goto out; 597 } 598 xprt_pin_rqst(req); 599 spin_unlock(&xprt->queue_lock); 600 601 ret = xs_read_stream_request(transport, msg, flags, req); 602 603 spin_lock(&xprt->queue_lock); 604 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 605 xprt_complete_rqst(req->rq_task, transport->recv.copied); 606 else 607 req->rq_private_buf.len = transport->recv.copied; 608 xprt_unpin_rqst(req); 609 out: 610 spin_unlock(&xprt->queue_lock); 611 return ret; 612 } 613 614 static ssize_t 615 xs_read_stream(struct sock_xprt *transport, int flags) 616 { 617 struct msghdr msg = { 0 }; 618 size_t want, read = 0; 619 ssize_t ret = 0; 620 621 if (transport->recv.len == 0) { 622 want = xs_read_stream_headersize(transport->recv.copied != 0); 623 ret = xs_read_stream_header(transport, &msg, flags, want, 624 transport->recv.offset); 625 if (ret <= 0) 626 goto out_err; 627 transport->recv.offset = ret; 628 if (transport->recv.offset != want) 629 return transport->recv.offset; 630 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & 631 RPC_FRAGMENT_SIZE_MASK; 632 transport->recv.offset -= sizeof(transport->recv.fraghdr); 633 read = ret; 634 } 635 636 switch (be32_to_cpu(transport->recv.calldir)) { 637 default: 638 msg.msg_flags |= MSG_TRUNC; 639 break; 640 case RPC_CALL: 641 ret = xs_read_stream_call(transport, &msg, flags); 642 break; 643 case RPC_REPLY: 644 ret = xs_read_stream_reply(transport, &msg, flags); 645 } 646 if (msg.msg_flags & MSG_TRUNC) { 647 transport->recv.calldir = cpu_to_be32(-1); 648 transport->recv.copied = -1; 649 } 650 if (ret < 0) 651 goto out_err; 652 read += ret; 653 if (transport->recv.offset < transport->recv.len) { 654 if (!(msg.msg_flags & MSG_TRUNC)) 655 return read; 656 msg.msg_flags = 0; 657 ret = xs_read_discard(transport->sock, &msg, flags, 658 transport->recv.len - transport->recv.offset); 659 if (ret <= 0) 660 goto out_err; 661 transport->recv.offset += ret; 662 read += ret; 663 if (transport->recv.offset != transport->recv.len) 664 return read; 665 } 666 if (xs_read_stream_request_done(transport)) { 667 trace_xs_stream_read_request(transport); 668 transport->recv.copied = 0; 669 } 670 transport->recv.offset = 0; 671 transport->recv.len = 0; 672 return read; 673 out_err: 674 return ret != 0 ? ret : -ESHUTDOWN; 675 } 676 677 static __poll_t xs_poll_socket(struct sock_xprt *transport) 678 { 679 return transport->sock->ops->poll(transport->file, transport->sock, 680 NULL); 681 } 682 683 static bool xs_poll_socket_readable(struct sock_xprt *transport) 684 { 685 __poll_t events = xs_poll_socket(transport); 686 687 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); 688 } 689 690 static void xs_poll_check_readable(struct sock_xprt *transport) 691 { 692 693 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 694 if (!xs_poll_socket_readable(transport)) 695 return; 696 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 697 queue_work(xprtiod_workqueue, &transport->recv_worker); 698 } 699 700 static void xs_stream_data_receive(struct sock_xprt *transport) 701 { 702 size_t read = 0; 703 ssize_t ret = 0; 704 705 mutex_lock(&transport->recv_mutex); 706 if (transport->sock == NULL) 707 goto out; 708 for (;;) { 709 ret = xs_read_stream(transport, MSG_DONTWAIT); 710 if (ret < 0) 711 break; 712 read += ret; 713 cond_resched(); 714 } 715 if (ret == -ESHUTDOWN) 716 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 717 else 718 xs_poll_check_readable(transport); 719 out: 720 mutex_unlock(&transport->recv_mutex); 721 trace_xs_stream_read_data(&transport->xprt, ret, read); 722 } 723 724 static void xs_stream_data_receive_workfn(struct work_struct *work) 725 { 726 struct sock_xprt *transport = 727 container_of(work, struct sock_xprt, recv_worker); 728 unsigned int pflags = memalloc_nofs_save(); 729 730 xs_stream_data_receive(transport); 731 memalloc_nofs_restore(pflags); 732 } 733 734 static void 735 xs_stream_reset_connect(struct sock_xprt *transport) 736 { 737 transport->recv.offset = 0; 738 transport->recv.len = 0; 739 transport->recv.copied = 0; 740 transport->xmit.offset = 0; 741 } 742 743 static void 744 xs_stream_start_connect(struct sock_xprt *transport) 745 { 746 transport->xprt.stat.connect_count++; 747 transport->xprt.stat.connect_start = jiffies; 748 } 749 750 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 751 752 static int xs_sendmsg(struct socket *sock, struct msghdr *msg, size_t seek) 753 { 754 if (seek) 755 iov_iter_advance(&msg->msg_iter, seek); 756 return sock_sendmsg(sock, msg); 757 } 758 759 static int xs_send_kvec(struct socket *sock, struct msghdr *msg, struct kvec *vec, size_t seek) 760 { 761 iov_iter_kvec(&msg->msg_iter, WRITE, vec, 1, vec->iov_len); 762 return xs_sendmsg(sock, msg, seek); 763 } 764 765 static int xs_send_pagedata(struct socket *sock, struct msghdr *msg, struct xdr_buf *xdr, size_t base) 766 { 767 int err; 768 769 err = xdr_alloc_bvec(xdr, GFP_KERNEL); 770 if (err < 0) 771 return err; 772 773 iov_iter_bvec(&msg->msg_iter, WRITE, xdr->bvec, 774 xdr_buf_pagecount(xdr), 775 xdr->page_len + xdr->page_base); 776 return xs_sendmsg(sock, msg, base + xdr->page_base); 777 } 778 779 #define xs_record_marker_len() sizeof(rpc_fraghdr) 780 781 /* Common case: 782 * - stream transport 783 * - sending from byte 0 of the message 784 * - the message is wholly contained in @xdr's head iovec 785 */ 786 static int xs_send_rm_and_kvec(struct socket *sock, struct msghdr *msg, 787 rpc_fraghdr marker, struct kvec *vec, size_t base) 788 { 789 struct kvec iov[2] = { 790 [0] = { 791 .iov_base = &marker, 792 .iov_len = sizeof(marker) 793 }, 794 [1] = *vec, 795 }; 796 size_t len = iov[0].iov_len + iov[1].iov_len; 797 798 iov_iter_kvec(&msg->msg_iter, WRITE, iov, 2, len); 799 return xs_sendmsg(sock, msg, base); 800 } 801 802 /** 803 * xs_sendpages - write pages directly to a socket 804 * @sock: socket to send on 805 * @addr: UDP only -- address of destination 806 * @addrlen: UDP only -- length of destination address 807 * @xdr: buffer containing this request 808 * @base: starting position in the buffer 809 * @rm: stream record marker field 810 * @sent_p: return the total number of bytes successfully queued for sending 811 * 812 */ 813 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, rpc_fraghdr rm, int *sent_p) 814 { 815 struct msghdr msg = { 816 .msg_name = addr, 817 .msg_namelen = addrlen, 818 .msg_flags = XS_SENDMSG_FLAGS | MSG_MORE, 819 }; 820 unsigned int rmsize = rm ? sizeof(rm) : 0; 821 unsigned int remainder = rmsize + xdr->len - base; 822 unsigned int want; 823 int err = 0; 824 825 if (unlikely(!sock)) 826 return -ENOTSOCK; 827 828 want = xdr->head[0].iov_len + rmsize; 829 if (base < want) { 830 unsigned int len = want - base; 831 remainder -= len; 832 if (remainder == 0) 833 msg.msg_flags &= ~MSG_MORE; 834 if (rmsize) 835 err = xs_send_rm_and_kvec(sock, &msg, rm, 836 &xdr->head[0], base); 837 else 838 err = xs_send_kvec(sock, &msg, &xdr->head[0], base); 839 if (remainder == 0 || err != len) 840 goto out; 841 *sent_p += err; 842 base = 0; 843 } else 844 base -= want; 845 846 if (base < xdr->page_len) { 847 unsigned int len = xdr->page_len - base; 848 remainder -= len; 849 if (remainder == 0) 850 msg.msg_flags &= ~MSG_MORE; 851 err = xs_send_pagedata(sock, &msg, xdr, base); 852 if (remainder == 0 || err != len) 853 goto out; 854 *sent_p += err; 855 base = 0; 856 } else 857 base -= xdr->page_len; 858 859 if (base >= xdr->tail[0].iov_len) 860 return 0; 861 msg.msg_flags &= ~MSG_MORE; 862 err = xs_send_kvec(sock, &msg, &xdr->tail[0], base); 863 out: 864 if (err > 0) { 865 *sent_p += err; 866 err = 0; 867 } 868 return err; 869 } 870 871 /** 872 * xs_nospace - handle transmit was incomplete 873 * @req: pointer to RPC request 874 * 875 */ 876 static int xs_nospace(struct rpc_rqst *req) 877 { 878 struct rpc_xprt *xprt = req->rq_xprt; 879 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 880 struct sock *sk = transport->inet; 881 int ret = -EAGAIN; 882 883 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", 884 req->rq_task->tk_pid, 885 req->rq_slen - transport->xmit.offset, 886 req->rq_slen); 887 888 /* Protect against races with write_space */ 889 spin_lock(&xprt->transport_lock); 890 891 /* Don't race with disconnect */ 892 if (xprt_connected(xprt)) { 893 /* wait for more buffer space */ 894 sk->sk_write_pending++; 895 xprt_wait_for_buffer_space(xprt); 896 } else 897 ret = -ENOTCONN; 898 899 spin_unlock(&xprt->transport_lock); 900 901 /* Race breaker in case memory is freed before above code is called */ 902 if (ret == -EAGAIN) { 903 struct socket_wq *wq; 904 905 rcu_read_lock(); 906 wq = rcu_dereference(sk->sk_wq); 907 set_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags); 908 rcu_read_unlock(); 909 910 sk->sk_write_space(sk); 911 } 912 return ret; 913 } 914 915 static void 916 xs_stream_prepare_request(struct rpc_rqst *req) 917 { 918 xdr_free_bvec(&req->rq_rcv_buf); 919 req->rq_task->tk_status = xdr_alloc_bvec(&req->rq_rcv_buf, GFP_KERNEL); 920 } 921 922 /* 923 * Determine if the previous message in the stream was aborted before it 924 * could complete transmission. 925 */ 926 static bool 927 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) 928 { 929 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; 930 } 931 932 /* 933 * Return the stream record marker field for a record of length < 2^31-1 934 */ 935 static rpc_fraghdr 936 xs_stream_record_marker(struct xdr_buf *xdr) 937 { 938 if (!xdr->len) 939 return 0; 940 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); 941 } 942 943 /** 944 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 945 * @req: pointer to RPC request 946 * 947 * Return values: 948 * 0: The request has been sent 949 * EAGAIN: The socket was blocked, please call again later to 950 * complete the request 951 * ENOTCONN: Caller needs to invoke connect logic then call again 952 * other: Some other error occured, the request was not sent 953 */ 954 static int xs_local_send_request(struct rpc_rqst *req) 955 { 956 struct rpc_xprt *xprt = req->rq_xprt; 957 struct sock_xprt *transport = 958 container_of(xprt, struct sock_xprt, xprt); 959 struct xdr_buf *xdr = &req->rq_snd_buf; 960 rpc_fraghdr rm = xs_stream_record_marker(xdr); 961 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 962 int status; 963 int sent = 0; 964 965 /* Close the stream if the previous transmission was incomplete */ 966 if (xs_send_request_was_aborted(transport, req)) { 967 xs_close(xprt); 968 return -ENOTCONN; 969 } 970 971 xs_pktdump("packet data:", 972 req->rq_svec->iov_base, req->rq_svec->iov_len); 973 974 req->rq_xtime = ktime_get(); 975 status = xs_sendpages(transport->sock, NULL, 0, xdr, 976 transport->xmit.offset, rm, &sent); 977 dprintk("RPC: %s(%u) = %d\n", 978 __func__, xdr->len - transport->xmit.offset, status); 979 980 if (status == -EAGAIN && sock_writeable(transport->inet)) 981 status = -ENOBUFS; 982 983 if (likely(sent > 0) || status == 0) { 984 transport->xmit.offset += sent; 985 req->rq_bytes_sent = transport->xmit.offset; 986 if (likely(req->rq_bytes_sent >= msglen)) { 987 req->rq_xmit_bytes_sent += transport->xmit.offset; 988 transport->xmit.offset = 0; 989 return 0; 990 } 991 status = -EAGAIN; 992 } 993 994 switch (status) { 995 case -ENOBUFS: 996 break; 997 case -EAGAIN: 998 status = xs_nospace(req); 999 break; 1000 default: 1001 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1002 -status); 1003 /* fall through */ 1004 case -EPIPE: 1005 xs_close(xprt); 1006 status = -ENOTCONN; 1007 } 1008 1009 return status; 1010 } 1011 1012 /** 1013 * xs_udp_send_request - write an RPC request to a UDP socket 1014 * @req: pointer to RPC request 1015 * 1016 * Return values: 1017 * 0: The request has been sent 1018 * EAGAIN: The socket was blocked, please call again later to 1019 * complete the request 1020 * ENOTCONN: Caller needs to invoke connect logic then call again 1021 * other: Some other error occurred, the request was not sent 1022 */ 1023 static int xs_udp_send_request(struct rpc_rqst *req) 1024 { 1025 struct rpc_xprt *xprt = req->rq_xprt; 1026 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1027 struct xdr_buf *xdr = &req->rq_snd_buf; 1028 int sent = 0; 1029 int status; 1030 1031 xs_pktdump("packet data:", 1032 req->rq_svec->iov_base, 1033 req->rq_svec->iov_len); 1034 1035 if (!xprt_bound(xprt)) 1036 return -ENOTCONN; 1037 1038 if (!xprt_request_get_cong(xprt, req)) 1039 return -EBADSLT; 1040 1041 req->rq_xtime = ktime_get(); 1042 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen, 1043 xdr, 0, 0, &sent); 1044 1045 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 1046 xdr->len, status); 1047 1048 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 1049 if (status == -EPERM) 1050 goto process_status; 1051 1052 if (status == -EAGAIN && sock_writeable(transport->inet)) 1053 status = -ENOBUFS; 1054 1055 if (sent > 0 || status == 0) { 1056 req->rq_xmit_bytes_sent += sent; 1057 if (sent >= req->rq_slen) 1058 return 0; 1059 /* Still some bytes left; set up for a retry later. */ 1060 status = -EAGAIN; 1061 } 1062 1063 process_status: 1064 switch (status) { 1065 case -ENOTSOCK: 1066 status = -ENOTCONN; 1067 /* Should we call xs_close() here? */ 1068 break; 1069 case -EAGAIN: 1070 status = xs_nospace(req); 1071 break; 1072 case -ENETUNREACH: 1073 case -ENOBUFS: 1074 case -EPIPE: 1075 case -ECONNREFUSED: 1076 case -EPERM: 1077 /* When the server has died, an ICMP port unreachable message 1078 * prompts ECONNREFUSED. */ 1079 break; 1080 default: 1081 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1082 -status); 1083 } 1084 1085 return status; 1086 } 1087 1088 /** 1089 * xs_tcp_send_request - write an RPC request to a TCP socket 1090 * @req: pointer to RPC request 1091 * 1092 * Return values: 1093 * 0: The request has been sent 1094 * EAGAIN: The socket was blocked, please call again later to 1095 * complete the request 1096 * ENOTCONN: Caller needs to invoke connect logic then call again 1097 * other: Some other error occurred, the request was not sent 1098 * 1099 * XXX: In the case of soft timeouts, should we eventually give up 1100 * if sendmsg is not able to make progress? 1101 */ 1102 static int xs_tcp_send_request(struct rpc_rqst *req) 1103 { 1104 struct rpc_xprt *xprt = req->rq_xprt; 1105 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1106 struct xdr_buf *xdr = &req->rq_snd_buf; 1107 rpc_fraghdr rm = xs_stream_record_marker(xdr); 1108 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 1109 bool vm_wait = false; 1110 int status; 1111 int sent; 1112 1113 /* Close the stream if the previous transmission was incomplete */ 1114 if (xs_send_request_was_aborted(transport, req)) { 1115 if (transport->sock != NULL) 1116 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 1117 return -ENOTCONN; 1118 } 1119 1120 xs_pktdump("packet data:", 1121 req->rq_svec->iov_base, 1122 req->rq_svec->iov_len); 1123 1124 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 1125 xs_tcp_set_socket_timeouts(xprt, transport->sock); 1126 1127 /* Continue transmitting the packet/record. We must be careful 1128 * to cope with writespace callbacks arriving _after_ we have 1129 * called sendmsg(). */ 1130 req->rq_xtime = ktime_get(); 1131 while (1) { 1132 sent = 0; 1133 status = xs_sendpages(transport->sock, NULL, 0, xdr, 1134 transport->xmit.offset, rm, &sent); 1135 1136 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 1137 xdr->len - transport->xmit.offset, status); 1138 1139 /* If we've sent the entire packet, immediately 1140 * reset the count of bytes sent. */ 1141 transport->xmit.offset += sent; 1142 req->rq_bytes_sent = transport->xmit.offset; 1143 if (likely(req->rq_bytes_sent >= msglen)) { 1144 req->rq_xmit_bytes_sent += transport->xmit.offset; 1145 transport->xmit.offset = 0; 1146 return 0; 1147 } 1148 1149 WARN_ON_ONCE(sent == 0 && status == 0); 1150 1151 if (status == -EAGAIN ) { 1152 /* 1153 * Return EAGAIN if we're sure we're hitting the 1154 * socket send buffer limits. 1155 */ 1156 if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) 1157 break; 1158 /* 1159 * Did we hit a memory allocation failure? 1160 */ 1161 if (sent == 0) { 1162 status = -ENOBUFS; 1163 if (vm_wait) 1164 break; 1165 /* Retry, knowing now that we're below the 1166 * socket send buffer limit 1167 */ 1168 vm_wait = true; 1169 } 1170 continue; 1171 } 1172 if (status < 0) 1173 break; 1174 vm_wait = false; 1175 } 1176 1177 switch (status) { 1178 case -ENOTSOCK: 1179 status = -ENOTCONN; 1180 /* Should we call xs_close() here? */ 1181 break; 1182 case -EAGAIN: 1183 status = xs_nospace(req); 1184 break; 1185 case -ECONNRESET: 1186 case -ECONNREFUSED: 1187 case -ENOTCONN: 1188 case -EADDRINUSE: 1189 case -ENOBUFS: 1190 case -EPIPE: 1191 break; 1192 default: 1193 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1194 -status); 1195 } 1196 1197 return status; 1198 } 1199 1200 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1201 { 1202 transport->old_data_ready = sk->sk_data_ready; 1203 transport->old_state_change = sk->sk_state_change; 1204 transport->old_write_space = sk->sk_write_space; 1205 transport->old_error_report = sk->sk_error_report; 1206 } 1207 1208 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1209 { 1210 sk->sk_data_ready = transport->old_data_ready; 1211 sk->sk_state_change = transport->old_state_change; 1212 sk->sk_write_space = transport->old_write_space; 1213 sk->sk_error_report = transport->old_error_report; 1214 } 1215 1216 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 1217 { 1218 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1219 1220 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1221 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state); 1222 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state); 1223 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state); 1224 } 1225 1226 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr) 1227 { 1228 set_bit(nr, &transport->sock_state); 1229 queue_work(xprtiod_workqueue, &transport->error_worker); 1230 } 1231 1232 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1233 { 1234 smp_mb__before_atomic(); 1235 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1236 clear_bit(XPRT_CLOSING, &xprt->state); 1237 xs_sock_reset_state_flags(xprt); 1238 smp_mb__after_atomic(); 1239 } 1240 1241 /** 1242 * xs_error_report - callback to handle TCP socket state errors 1243 * @sk: socket 1244 * 1245 * Note: we don't call sock_error() since there may be a rpc_task 1246 * using the socket, and so we don't want to clear sk->sk_err. 1247 */ 1248 static void xs_error_report(struct sock *sk) 1249 { 1250 struct sock_xprt *transport; 1251 struct rpc_xprt *xprt; 1252 1253 read_lock_bh(&sk->sk_callback_lock); 1254 if (!(xprt = xprt_from_sock(sk))) 1255 goto out; 1256 1257 transport = container_of(xprt, struct sock_xprt, xprt); 1258 transport->xprt_err = -sk->sk_err; 1259 if (transport->xprt_err == 0) 1260 goto out; 1261 dprintk("RPC: xs_error_report client %p, error=%d...\n", 1262 xprt, -transport->xprt_err); 1263 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err); 1264 1265 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */ 1266 smp_mb__before_atomic(); 1267 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR); 1268 out: 1269 read_unlock_bh(&sk->sk_callback_lock); 1270 } 1271 1272 static void xs_reset_transport(struct sock_xprt *transport) 1273 { 1274 struct socket *sock = transport->sock; 1275 struct sock *sk = transport->inet; 1276 struct rpc_xprt *xprt = &transport->xprt; 1277 struct file *filp = transport->file; 1278 1279 if (sk == NULL) 1280 return; 1281 1282 if (atomic_read(&transport->xprt.swapper)) 1283 sk_clear_memalloc(sk); 1284 1285 kernel_sock_shutdown(sock, SHUT_RDWR); 1286 1287 mutex_lock(&transport->recv_mutex); 1288 write_lock_bh(&sk->sk_callback_lock); 1289 transport->inet = NULL; 1290 transport->sock = NULL; 1291 transport->file = NULL; 1292 1293 sk->sk_user_data = NULL; 1294 1295 xs_restore_old_callbacks(transport, sk); 1296 xprt_clear_connected(xprt); 1297 write_unlock_bh(&sk->sk_callback_lock); 1298 xs_sock_reset_connection_flags(xprt); 1299 /* Reset stream record info */ 1300 xs_stream_reset_connect(transport); 1301 mutex_unlock(&transport->recv_mutex); 1302 1303 trace_rpc_socket_close(xprt, sock); 1304 fput(filp); 1305 1306 xprt_disconnect_done(xprt); 1307 } 1308 1309 /** 1310 * xs_close - close a socket 1311 * @xprt: transport 1312 * 1313 * This is used when all requests are complete; ie, no DRC state remains 1314 * on the server we want to save. 1315 * 1316 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 1317 * xs_reset_transport() zeroing the socket from underneath a writer. 1318 */ 1319 static void xs_close(struct rpc_xprt *xprt) 1320 { 1321 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1322 1323 dprintk("RPC: xs_close xprt %p\n", xprt); 1324 1325 xs_reset_transport(transport); 1326 xprt->reestablish_timeout = 0; 1327 } 1328 1329 static void xs_inject_disconnect(struct rpc_xprt *xprt) 1330 { 1331 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 1332 xprt); 1333 xprt_disconnect_done(xprt); 1334 } 1335 1336 static void xs_xprt_free(struct rpc_xprt *xprt) 1337 { 1338 xs_free_peer_addresses(xprt); 1339 xprt_free(xprt); 1340 } 1341 1342 /** 1343 * xs_destroy - prepare to shutdown a transport 1344 * @xprt: doomed transport 1345 * 1346 */ 1347 static void xs_destroy(struct rpc_xprt *xprt) 1348 { 1349 struct sock_xprt *transport = container_of(xprt, 1350 struct sock_xprt, xprt); 1351 dprintk("RPC: xs_destroy xprt %p\n", xprt); 1352 1353 cancel_delayed_work_sync(&transport->connect_worker); 1354 xs_close(xprt); 1355 cancel_work_sync(&transport->recv_worker); 1356 cancel_work_sync(&transport->error_worker); 1357 xs_xprt_free(xprt); 1358 module_put(THIS_MODULE); 1359 } 1360 1361 /** 1362 * xs_udp_data_read_skb - receive callback for UDP sockets 1363 * @xprt: transport 1364 * @sk: socket 1365 * @skb: skbuff 1366 * 1367 */ 1368 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1369 struct sock *sk, 1370 struct sk_buff *skb) 1371 { 1372 struct rpc_task *task; 1373 struct rpc_rqst *rovr; 1374 int repsize, copied; 1375 u32 _xid; 1376 __be32 *xp; 1377 1378 repsize = skb->len; 1379 if (repsize < 4) { 1380 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1381 return; 1382 } 1383 1384 /* Copy the XID from the skb... */ 1385 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1386 if (xp == NULL) 1387 return; 1388 1389 /* Look up and lock the request corresponding to the given XID */ 1390 spin_lock(&xprt->queue_lock); 1391 rovr = xprt_lookup_rqst(xprt, *xp); 1392 if (!rovr) 1393 goto out_unlock; 1394 xprt_pin_rqst(rovr); 1395 xprt_update_rtt(rovr->rq_task); 1396 spin_unlock(&xprt->queue_lock); 1397 task = rovr->rq_task; 1398 1399 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1400 copied = repsize; 1401 1402 /* Suck it into the iovec, verify checksum if not done by hw. */ 1403 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1404 spin_lock(&xprt->queue_lock); 1405 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1406 goto out_unpin; 1407 } 1408 1409 1410 spin_lock(&xprt->transport_lock); 1411 xprt_adjust_cwnd(xprt, task, copied); 1412 spin_unlock(&xprt->transport_lock); 1413 spin_lock(&xprt->queue_lock); 1414 xprt_complete_rqst(task, copied); 1415 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1416 out_unpin: 1417 xprt_unpin_rqst(rovr); 1418 out_unlock: 1419 spin_unlock(&xprt->queue_lock); 1420 } 1421 1422 static void xs_udp_data_receive(struct sock_xprt *transport) 1423 { 1424 struct sk_buff *skb; 1425 struct sock *sk; 1426 int err; 1427 1428 mutex_lock(&transport->recv_mutex); 1429 sk = transport->inet; 1430 if (sk == NULL) 1431 goto out; 1432 for (;;) { 1433 skb = skb_recv_udp(sk, 0, 1, &err); 1434 if (skb == NULL) 1435 break; 1436 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1437 consume_skb(skb); 1438 cond_resched(); 1439 } 1440 xs_poll_check_readable(transport); 1441 out: 1442 mutex_unlock(&transport->recv_mutex); 1443 } 1444 1445 static void xs_udp_data_receive_workfn(struct work_struct *work) 1446 { 1447 struct sock_xprt *transport = 1448 container_of(work, struct sock_xprt, recv_worker); 1449 unsigned int pflags = memalloc_nofs_save(); 1450 1451 xs_udp_data_receive(transport); 1452 memalloc_nofs_restore(pflags); 1453 } 1454 1455 /** 1456 * xs_data_ready - "data ready" callback for UDP sockets 1457 * @sk: socket with data to read 1458 * 1459 */ 1460 static void xs_data_ready(struct sock *sk) 1461 { 1462 struct rpc_xprt *xprt; 1463 1464 read_lock_bh(&sk->sk_callback_lock); 1465 dprintk("RPC: xs_data_ready...\n"); 1466 xprt = xprt_from_sock(sk); 1467 if (xprt != NULL) { 1468 struct sock_xprt *transport = container_of(xprt, 1469 struct sock_xprt, xprt); 1470 transport->old_data_ready(sk); 1471 /* Any data means we had a useful conversation, so 1472 * then we don't need to delay the next reconnect 1473 */ 1474 if (xprt->reestablish_timeout) 1475 xprt->reestablish_timeout = 0; 1476 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1477 queue_work(xprtiod_workqueue, &transport->recv_worker); 1478 } 1479 read_unlock_bh(&sk->sk_callback_lock); 1480 } 1481 1482 /* 1483 * Helper function to force a TCP close if the server is sending 1484 * junk and/or it has put us in CLOSE_WAIT 1485 */ 1486 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1487 { 1488 xprt_force_disconnect(xprt); 1489 } 1490 1491 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1492 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1493 { 1494 return PAGE_SIZE; 1495 } 1496 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1497 1498 /** 1499 * xs_tcp_state_change - callback to handle TCP socket state changes 1500 * @sk: socket whose state has changed 1501 * 1502 */ 1503 static void xs_tcp_state_change(struct sock *sk) 1504 { 1505 struct rpc_xprt *xprt; 1506 struct sock_xprt *transport; 1507 1508 read_lock_bh(&sk->sk_callback_lock); 1509 if (!(xprt = xprt_from_sock(sk))) 1510 goto out; 1511 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1512 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1513 sk->sk_state, xprt_connected(xprt), 1514 sock_flag(sk, SOCK_DEAD), 1515 sock_flag(sk, SOCK_ZAPPED), 1516 sk->sk_shutdown); 1517 1518 transport = container_of(xprt, struct sock_xprt, xprt); 1519 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1520 switch (sk->sk_state) { 1521 case TCP_ESTABLISHED: 1522 if (!xprt_test_and_set_connected(xprt)) { 1523 xprt->connect_cookie++; 1524 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1525 xprt_clear_connecting(xprt); 1526 1527 xprt->stat.connect_count++; 1528 xprt->stat.connect_time += (long)jiffies - 1529 xprt->stat.connect_start; 1530 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING); 1531 } 1532 break; 1533 case TCP_FIN_WAIT1: 1534 /* The client initiated a shutdown of the socket */ 1535 xprt->connect_cookie++; 1536 xprt->reestablish_timeout = 0; 1537 set_bit(XPRT_CLOSING, &xprt->state); 1538 smp_mb__before_atomic(); 1539 clear_bit(XPRT_CONNECTED, &xprt->state); 1540 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1541 smp_mb__after_atomic(); 1542 break; 1543 case TCP_CLOSE_WAIT: 1544 /* The server initiated a shutdown of the socket */ 1545 xprt->connect_cookie++; 1546 clear_bit(XPRT_CONNECTED, &xprt->state); 1547 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1548 /* fall through */ 1549 case TCP_CLOSING: 1550 /* 1551 * If the server closed down the connection, make sure that 1552 * we back off before reconnecting 1553 */ 1554 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1555 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1556 break; 1557 case TCP_LAST_ACK: 1558 set_bit(XPRT_CLOSING, &xprt->state); 1559 smp_mb__before_atomic(); 1560 clear_bit(XPRT_CONNECTED, &xprt->state); 1561 smp_mb__after_atomic(); 1562 break; 1563 case TCP_CLOSE: 1564 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1565 &transport->sock_state)) 1566 xprt_clear_connecting(xprt); 1567 clear_bit(XPRT_CLOSING, &xprt->state); 1568 /* Trigger the socket release */ 1569 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1570 } 1571 out: 1572 read_unlock_bh(&sk->sk_callback_lock); 1573 } 1574 1575 static void xs_write_space(struct sock *sk) 1576 { 1577 struct socket_wq *wq; 1578 struct sock_xprt *transport; 1579 struct rpc_xprt *xprt; 1580 1581 if (!sk->sk_socket) 1582 return; 1583 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1584 1585 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1586 return; 1587 transport = container_of(xprt, struct sock_xprt, xprt); 1588 rcu_read_lock(); 1589 wq = rcu_dereference(sk->sk_wq); 1590 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0) 1591 goto out; 1592 1593 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE); 1594 sk->sk_write_pending--; 1595 out: 1596 rcu_read_unlock(); 1597 } 1598 1599 /** 1600 * xs_udp_write_space - callback invoked when socket buffer space 1601 * becomes available 1602 * @sk: socket whose state has changed 1603 * 1604 * Called when more output buffer space is available for this socket. 1605 * We try not to wake our writers until they can make "significant" 1606 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1607 * with a bunch of small requests. 1608 */ 1609 static void xs_udp_write_space(struct sock *sk) 1610 { 1611 read_lock_bh(&sk->sk_callback_lock); 1612 1613 /* from net/core/sock.c:sock_def_write_space */ 1614 if (sock_writeable(sk)) 1615 xs_write_space(sk); 1616 1617 read_unlock_bh(&sk->sk_callback_lock); 1618 } 1619 1620 /** 1621 * xs_tcp_write_space - callback invoked when socket buffer space 1622 * becomes available 1623 * @sk: socket whose state has changed 1624 * 1625 * Called when more output buffer space is available for this socket. 1626 * We try not to wake our writers until they can make "significant" 1627 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1628 * with a bunch of small requests. 1629 */ 1630 static void xs_tcp_write_space(struct sock *sk) 1631 { 1632 read_lock_bh(&sk->sk_callback_lock); 1633 1634 /* from net/core/stream.c:sk_stream_write_space */ 1635 if (sk_stream_is_writeable(sk)) 1636 xs_write_space(sk); 1637 1638 read_unlock_bh(&sk->sk_callback_lock); 1639 } 1640 1641 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1642 { 1643 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1644 struct sock *sk = transport->inet; 1645 1646 if (transport->rcvsize) { 1647 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1648 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1649 } 1650 if (transport->sndsize) { 1651 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1652 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1653 sk->sk_write_space(sk); 1654 } 1655 } 1656 1657 /** 1658 * xs_udp_set_buffer_size - set send and receive limits 1659 * @xprt: generic transport 1660 * @sndsize: requested size of send buffer, in bytes 1661 * @rcvsize: requested size of receive buffer, in bytes 1662 * 1663 * Set socket send and receive buffer size limits. 1664 */ 1665 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1666 { 1667 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1668 1669 transport->sndsize = 0; 1670 if (sndsize) 1671 transport->sndsize = sndsize + 1024; 1672 transport->rcvsize = 0; 1673 if (rcvsize) 1674 transport->rcvsize = rcvsize + 1024; 1675 1676 xs_udp_do_set_buffer_size(xprt); 1677 } 1678 1679 /** 1680 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1681 * @xprt: controlling transport 1682 * @task: task that timed out 1683 * 1684 * Adjust the congestion window after a retransmit timeout has occurred. 1685 */ 1686 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1687 { 1688 spin_lock(&xprt->transport_lock); 1689 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1690 spin_unlock(&xprt->transport_lock); 1691 } 1692 1693 static int xs_get_random_port(void) 1694 { 1695 unsigned short min = xprt_min_resvport, max = xprt_max_resvport; 1696 unsigned short range; 1697 unsigned short rand; 1698 1699 if (max < min) 1700 return -EADDRINUSE; 1701 range = max - min + 1; 1702 rand = (unsigned short) prandom_u32() % range; 1703 return rand + min; 1704 } 1705 1706 /** 1707 * xs_set_reuseaddr_port - set the socket's port and address reuse options 1708 * @sock: socket 1709 * 1710 * Note that this function has to be called on all sockets that share the 1711 * same port, and it must be called before binding. 1712 */ 1713 static void xs_sock_set_reuseport(struct socket *sock) 1714 { 1715 int opt = 1; 1716 1717 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, 1718 (char *)&opt, sizeof(opt)); 1719 } 1720 1721 static unsigned short xs_sock_getport(struct socket *sock) 1722 { 1723 struct sockaddr_storage buf; 1724 unsigned short port = 0; 1725 1726 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) 1727 goto out; 1728 switch (buf.ss_family) { 1729 case AF_INET6: 1730 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1731 break; 1732 case AF_INET: 1733 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1734 } 1735 out: 1736 return port; 1737 } 1738 1739 /** 1740 * xs_set_port - reset the port number in the remote endpoint address 1741 * @xprt: generic transport 1742 * @port: new port number 1743 * 1744 */ 1745 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1746 { 1747 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1748 1749 rpc_set_port(xs_addr(xprt), port); 1750 xs_update_peer_port(xprt); 1751 } 1752 1753 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1754 { 1755 if (transport->srcport == 0 && transport->xprt.reuseport) 1756 transport->srcport = xs_sock_getport(sock); 1757 } 1758 1759 static int xs_get_srcport(struct sock_xprt *transport) 1760 { 1761 int port = transport->srcport; 1762 1763 if (port == 0 && transport->xprt.resvport) 1764 port = xs_get_random_port(); 1765 return port; 1766 } 1767 1768 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1769 { 1770 if (transport->srcport != 0) 1771 transport->srcport = 0; 1772 if (!transport->xprt.resvport) 1773 return 0; 1774 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1775 return xprt_max_resvport; 1776 return --port; 1777 } 1778 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1779 { 1780 struct sockaddr_storage myaddr; 1781 int err, nloop = 0; 1782 int port = xs_get_srcport(transport); 1783 unsigned short last; 1784 1785 /* 1786 * If we are asking for any ephemeral port (i.e. port == 0 && 1787 * transport->xprt.resvport == 0), don't bind. Let the local 1788 * port selection happen implicitly when the socket is used 1789 * (for example at connect time). 1790 * 1791 * This ensures that we can continue to establish TCP 1792 * connections even when all local ephemeral ports are already 1793 * a part of some TCP connection. This makes no difference 1794 * for UDP sockets, but also doens't harm them. 1795 * 1796 * If we're asking for any reserved port (i.e. port == 0 && 1797 * transport->xprt.resvport == 1) xs_get_srcport above will 1798 * ensure that port is non-zero and we will bind as needed. 1799 */ 1800 if (port <= 0) 1801 return port; 1802 1803 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1804 do { 1805 rpc_set_port((struct sockaddr *)&myaddr, port); 1806 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1807 transport->xprt.addrlen); 1808 if (err == 0) { 1809 transport->srcport = port; 1810 break; 1811 } 1812 last = port; 1813 port = xs_next_srcport(transport, port); 1814 if (port > last) 1815 nloop++; 1816 } while (err == -EADDRINUSE && nloop != 2); 1817 1818 if (myaddr.ss_family == AF_INET) 1819 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1820 &((struct sockaddr_in *)&myaddr)->sin_addr, 1821 port, err ? "failed" : "ok", err); 1822 else 1823 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1824 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1825 port, err ? "failed" : "ok", err); 1826 return err; 1827 } 1828 1829 /* 1830 * We don't support autobind on AF_LOCAL sockets 1831 */ 1832 static void xs_local_rpcbind(struct rpc_task *task) 1833 { 1834 xprt_set_bound(task->tk_xprt); 1835 } 1836 1837 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1838 { 1839 } 1840 1841 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1842 static struct lock_class_key xs_key[2]; 1843 static struct lock_class_key xs_slock_key[2]; 1844 1845 static inline void xs_reclassify_socketu(struct socket *sock) 1846 { 1847 struct sock *sk = sock->sk; 1848 1849 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1850 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]); 1851 } 1852 1853 static inline void xs_reclassify_socket4(struct socket *sock) 1854 { 1855 struct sock *sk = sock->sk; 1856 1857 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1858 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]); 1859 } 1860 1861 static inline void xs_reclassify_socket6(struct socket *sock) 1862 { 1863 struct sock *sk = sock->sk; 1864 1865 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1866 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]); 1867 } 1868 1869 static inline void xs_reclassify_socket(int family, struct socket *sock) 1870 { 1871 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1872 return; 1873 1874 switch (family) { 1875 case AF_LOCAL: 1876 xs_reclassify_socketu(sock); 1877 break; 1878 case AF_INET: 1879 xs_reclassify_socket4(sock); 1880 break; 1881 case AF_INET6: 1882 xs_reclassify_socket6(sock); 1883 break; 1884 } 1885 } 1886 #else 1887 static inline void xs_reclassify_socket(int family, struct socket *sock) 1888 { 1889 } 1890 #endif 1891 1892 static void xs_dummy_setup_socket(struct work_struct *work) 1893 { 1894 } 1895 1896 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1897 struct sock_xprt *transport, int family, int type, 1898 int protocol, bool reuseport) 1899 { 1900 struct file *filp; 1901 struct socket *sock; 1902 int err; 1903 1904 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1905 if (err < 0) { 1906 dprintk("RPC: can't create %d transport socket (%d).\n", 1907 protocol, -err); 1908 goto out; 1909 } 1910 xs_reclassify_socket(family, sock); 1911 1912 if (reuseport) 1913 xs_sock_set_reuseport(sock); 1914 1915 err = xs_bind(transport, sock); 1916 if (err) { 1917 sock_release(sock); 1918 goto out; 1919 } 1920 1921 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1922 if (IS_ERR(filp)) 1923 return ERR_CAST(filp); 1924 transport->file = filp; 1925 1926 return sock; 1927 out: 1928 return ERR_PTR(err); 1929 } 1930 1931 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1932 struct socket *sock) 1933 { 1934 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1935 xprt); 1936 1937 if (!transport->inet) { 1938 struct sock *sk = sock->sk; 1939 1940 write_lock_bh(&sk->sk_callback_lock); 1941 1942 xs_save_old_callbacks(transport, sk); 1943 1944 sk->sk_user_data = xprt; 1945 sk->sk_data_ready = xs_data_ready; 1946 sk->sk_write_space = xs_udp_write_space; 1947 sock_set_flag(sk, SOCK_FASYNC); 1948 sk->sk_error_report = xs_error_report; 1949 1950 xprt_clear_connected(xprt); 1951 1952 /* Reset to new socket */ 1953 transport->sock = sock; 1954 transport->inet = sk; 1955 1956 write_unlock_bh(&sk->sk_callback_lock); 1957 } 1958 1959 xs_stream_start_connect(transport); 1960 1961 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1962 } 1963 1964 /** 1965 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1966 * @transport: socket transport to connect 1967 */ 1968 static int xs_local_setup_socket(struct sock_xprt *transport) 1969 { 1970 struct rpc_xprt *xprt = &transport->xprt; 1971 struct file *filp; 1972 struct socket *sock; 1973 int status = -EIO; 1974 1975 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1976 SOCK_STREAM, 0, &sock, 1); 1977 if (status < 0) { 1978 dprintk("RPC: can't create AF_LOCAL " 1979 "transport socket (%d).\n", -status); 1980 goto out; 1981 } 1982 xs_reclassify_socket(AF_LOCAL, sock); 1983 1984 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1985 if (IS_ERR(filp)) { 1986 status = PTR_ERR(filp); 1987 goto out; 1988 } 1989 transport->file = filp; 1990 1991 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1992 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1993 1994 status = xs_local_finish_connecting(xprt, sock); 1995 trace_rpc_socket_connect(xprt, sock, status); 1996 switch (status) { 1997 case 0: 1998 dprintk("RPC: xprt %p connected to %s\n", 1999 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2000 xprt->stat.connect_count++; 2001 xprt->stat.connect_time += (long)jiffies - 2002 xprt->stat.connect_start; 2003 xprt_set_connected(xprt); 2004 case -ENOBUFS: 2005 break; 2006 case -ENOENT: 2007 dprintk("RPC: xprt %p: socket %s does not exist\n", 2008 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2009 break; 2010 case -ECONNREFUSED: 2011 dprintk("RPC: xprt %p: connection refused for %s\n", 2012 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 2013 break; 2014 default: 2015 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 2016 __func__, -status, 2017 xprt->address_strings[RPC_DISPLAY_ADDR]); 2018 } 2019 2020 out: 2021 xprt_clear_connecting(xprt); 2022 xprt_wake_pending_tasks(xprt, status); 2023 return status; 2024 } 2025 2026 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2027 { 2028 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2029 int ret; 2030 2031 if (RPC_IS_ASYNC(task)) { 2032 /* 2033 * We want the AF_LOCAL connect to be resolved in the 2034 * filesystem namespace of the process making the rpc 2035 * call. Thus we connect synchronously. 2036 * 2037 * If we want to support asynchronous AF_LOCAL calls, 2038 * we'll need to figure out how to pass a namespace to 2039 * connect. 2040 */ 2041 task->tk_rpc_status = -ENOTCONN; 2042 rpc_exit(task, -ENOTCONN); 2043 return; 2044 } 2045 ret = xs_local_setup_socket(transport); 2046 if (ret && !RPC_IS_SOFTCONN(task)) 2047 msleep_interruptible(15000); 2048 } 2049 2050 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2051 /* 2052 * Note that this should be called with XPRT_LOCKED held (or when we otherwise 2053 * know that we have exclusive access to the socket), to guard against 2054 * races with xs_reset_transport. 2055 */ 2056 static void xs_set_memalloc(struct rpc_xprt *xprt) 2057 { 2058 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2059 xprt); 2060 2061 /* 2062 * If there's no sock, then we have nothing to set. The 2063 * reconnecting process will get it for us. 2064 */ 2065 if (!transport->inet) 2066 return; 2067 if (atomic_read(&xprt->swapper)) 2068 sk_set_memalloc(transport->inet); 2069 } 2070 2071 /** 2072 * xs_enable_swap - Tag this transport as being used for swap. 2073 * @xprt: transport to tag 2074 * 2075 * Take a reference to this transport on behalf of the rpc_clnt, and 2076 * optionally mark it for swapping if it wasn't already. 2077 */ 2078 static int 2079 xs_enable_swap(struct rpc_xprt *xprt) 2080 { 2081 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2082 2083 if (atomic_inc_return(&xprt->swapper) != 1) 2084 return 0; 2085 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2086 return -ERESTARTSYS; 2087 if (xs->inet) 2088 sk_set_memalloc(xs->inet); 2089 xprt_release_xprt(xprt, NULL); 2090 return 0; 2091 } 2092 2093 /** 2094 * xs_disable_swap - Untag this transport as being used for swap. 2095 * @xprt: transport to tag 2096 * 2097 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2098 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2099 */ 2100 static void 2101 xs_disable_swap(struct rpc_xprt *xprt) 2102 { 2103 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2104 2105 if (!atomic_dec_and_test(&xprt->swapper)) 2106 return; 2107 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) 2108 return; 2109 if (xs->inet) 2110 sk_clear_memalloc(xs->inet); 2111 xprt_release_xprt(xprt, NULL); 2112 } 2113 #else 2114 static void xs_set_memalloc(struct rpc_xprt *xprt) 2115 { 2116 } 2117 2118 static int 2119 xs_enable_swap(struct rpc_xprt *xprt) 2120 { 2121 return -EINVAL; 2122 } 2123 2124 static void 2125 xs_disable_swap(struct rpc_xprt *xprt) 2126 { 2127 } 2128 #endif 2129 2130 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2131 { 2132 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2133 2134 if (!transport->inet) { 2135 struct sock *sk = sock->sk; 2136 2137 write_lock_bh(&sk->sk_callback_lock); 2138 2139 xs_save_old_callbacks(transport, sk); 2140 2141 sk->sk_user_data = xprt; 2142 sk->sk_data_ready = xs_data_ready; 2143 sk->sk_write_space = xs_udp_write_space; 2144 sock_set_flag(sk, SOCK_FASYNC); 2145 2146 xprt_set_connected(xprt); 2147 2148 /* Reset to new socket */ 2149 transport->sock = sock; 2150 transport->inet = sk; 2151 2152 xs_set_memalloc(xprt); 2153 2154 write_unlock_bh(&sk->sk_callback_lock); 2155 } 2156 xs_udp_do_set_buffer_size(xprt); 2157 2158 xprt->stat.connect_start = jiffies; 2159 } 2160 2161 static void xs_udp_setup_socket(struct work_struct *work) 2162 { 2163 struct sock_xprt *transport = 2164 container_of(work, struct sock_xprt, connect_worker.work); 2165 struct rpc_xprt *xprt = &transport->xprt; 2166 struct socket *sock; 2167 int status = -EIO; 2168 2169 sock = xs_create_sock(xprt, transport, 2170 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2171 IPPROTO_UDP, false); 2172 if (IS_ERR(sock)) 2173 goto out; 2174 2175 dprintk("RPC: worker connecting xprt %p via %s to " 2176 "%s (port %s)\n", xprt, 2177 xprt->address_strings[RPC_DISPLAY_PROTO], 2178 xprt->address_strings[RPC_DISPLAY_ADDR], 2179 xprt->address_strings[RPC_DISPLAY_PORT]); 2180 2181 xs_udp_finish_connecting(xprt, sock); 2182 trace_rpc_socket_connect(xprt, sock, 0); 2183 status = 0; 2184 out: 2185 xprt_clear_connecting(xprt); 2186 xprt_unlock_connect(xprt, transport); 2187 xprt_wake_pending_tasks(xprt, status); 2188 } 2189 2190 /** 2191 * xs_tcp_shutdown - gracefully shut down a TCP socket 2192 * @xprt: transport 2193 * 2194 * Initiates a graceful shutdown of the TCP socket by calling the 2195 * equivalent of shutdown(SHUT_RDWR); 2196 */ 2197 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2198 { 2199 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2200 struct socket *sock = transport->sock; 2201 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; 2202 2203 if (sock == NULL) 2204 return; 2205 switch (skst) { 2206 default: 2207 kernel_sock_shutdown(sock, SHUT_RDWR); 2208 trace_rpc_socket_shutdown(xprt, sock); 2209 break; 2210 case TCP_CLOSE: 2211 case TCP_TIME_WAIT: 2212 xs_reset_transport(transport); 2213 } 2214 } 2215 2216 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2217 struct socket *sock) 2218 { 2219 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2220 unsigned int keepidle; 2221 unsigned int keepcnt; 2222 unsigned int opt_on = 1; 2223 unsigned int timeo; 2224 2225 spin_lock(&xprt->transport_lock); 2226 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2227 keepcnt = xprt->timeout->to_retries + 1; 2228 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2229 (xprt->timeout->to_retries + 1); 2230 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2231 spin_unlock(&xprt->transport_lock); 2232 2233 /* TCP Keepalive options */ 2234 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 2235 (char *)&opt_on, sizeof(opt_on)); 2236 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, 2237 (char *)&keepidle, sizeof(keepidle)); 2238 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, 2239 (char *)&keepidle, sizeof(keepidle)); 2240 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, 2241 (char *)&keepcnt, sizeof(keepcnt)); 2242 2243 /* TCP user timeout (see RFC5482) */ 2244 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, 2245 (char *)&timeo, sizeof(timeo)); 2246 } 2247 2248 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2249 unsigned long connect_timeout, 2250 unsigned long reconnect_timeout) 2251 { 2252 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2253 struct rpc_timeout to; 2254 unsigned long initval; 2255 2256 spin_lock(&xprt->transport_lock); 2257 if (reconnect_timeout < xprt->max_reconnect_timeout) 2258 xprt->max_reconnect_timeout = reconnect_timeout; 2259 if (connect_timeout < xprt->connect_timeout) { 2260 memcpy(&to, xprt->timeout, sizeof(to)); 2261 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2262 /* Arbitrary lower limit */ 2263 if (initval < XS_TCP_INIT_REEST_TO << 1) 2264 initval = XS_TCP_INIT_REEST_TO << 1; 2265 to.to_initval = initval; 2266 to.to_maxval = initval; 2267 memcpy(&transport->tcp_timeout, &to, 2268 sizeof(transport->tcp_timeout)); 2269 xprt->timeout = &transport->tcp_timeout; 2270 xprt->connect_timeout = connect_timeout; 2271 } 2272 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2273 spin_unlock(&xprt->transport_lock); 2274 } 2275 2276 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2277 { 2278 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2279 int ret = -ENOTCONN; 2280 2281 if (!transport->inet) { 2282 struct sock *sk = sock->sk; 2283 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC; 2284 2285 /* Avoid temporary address, they are bad for long-lived 2286 * connections such as NFS mounts. 2287 * RFC4941, section 3.6 suggests that: 2288 * Individual applications, which have specific 2289 * knowledge about the normal duration of connections, 2290 * MAY override this as appropriate. 2291 */ 2292 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES, 2293 (char *)&addr_pref, sizeof(addr_pref)); 2294 2295 xs_tcp_set_socket_timeouts(xprt, sock); 2296 2297 write_lock_bh(&sk->sk_callback_lock); 2298 2299 xs_save_old_callbacks(transport, sk); 2300 2301 sk->sk_user_data = xprt; 2302 sk->sk_data_ready = xs_data_ready; 2303 sk->sk_state_change = xs_tcp_state_change; 2304 sk->sk_write_space = xs_tcp_write_space; 2305 sock_set_flag(sk, SOCK_FASYNC); 2306 sk->sk_error_report = xs_error_report; 2307 2308 /* socket options */ 2309 sock_reset_flag(sk, SOCK_LINGER); 2310 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 2311 2312 xprt_clear_connected(xprt); 2313 2314 /* Reset to new socket */ 2315 transport->sock = sock; 2316 transport->inet = sk; 2317 2318 write_unlock_bh(&sk->sk_callback_lock); 2319 } 2320 2321 if (!xprt_bound(xprt)) 2322 goto out; 2323 2324 xs_set_memalloc(xprt); 2325 2326 xs_stream_start_connect(transport); 2327 2328 /* Tell the socket layer to start connecting... */ 2329 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2330 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2331 switch (ret) { 2332 case 0: 2333 xs_set_srcport(transport, sock); 2334 /* fall through */ 2335 case -EINPROGRESS: 2336 /* SYN_SENT! */ 2337 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2338 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2339 break; 2340 case -EADDRNOTAVAIL: 2341 /* Source port number is unavailable. Try a new one! */ 2342 transport->srcport = 0; 2343 } 2344 out: 2345 return ret; 2346 } 2347 2348 /** 2349 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2350 * @work: queued work item 2351 * 2352 * Invoked by a work queue tasklet. 2353 */ 2354 static void xs_tcp_setup_socket(struct work_struct *work) 2355 { 2356 struct sock_xprt *transport = 2357 container_of(work, struct sock_xprt, connect_worker.work); 2358 struct socket *sock = transport->sock; 2359 struct rpc_xprt *xprt = &transport->xprt; 2360 int status = -EIO; 2361 2362 if (!sock) { 2363 sock = xs_create_sock(xprt, transport, 2364 xs_addr(xprt)->sa_family, SOCK_STREAM, 2365 IPPROTO_TCP, true); 2366 if (IS_ERR(sock)) { 2367 status = PTR_ERR(sock); 2368 goto out; 2369 } 2370 } 2371 2372 dprintk("RPC: worker connecting xprt %p via %s to " 2373 "%s (port %s)\n", xprt, 2374 xprt->address_strings[RPC_DISPLAY_PROTO], 2375 xprt->address_strings[RPC_DISPLAY_ADDR], 2376 xprt->address_strings[RPC_DISPLAY_PORT]); 2377 2378 status = xs_tcp_finish_connecting(xprt, sock); 2379 trace_rpc_socket_connect(xprt, sock, status); 2380 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2381 xprt, -status, xprt_connected(xprt), 2382 sock->sk->sk_state); 2383 switch (status) { 2384 default: 2385 printk("%s: connect returned unhandled error %d\n", 2386 __func__, status); 2387 /* fall through */ 2388 case -EADDRNOTAVAIL: 2389 /* We're probably in TIME_WAIT. Get rid of existing socket, 2390 * and retry 2391 */ 2392 xs_tcp_force_close(xprt); 2393 break; 2394 case 0: 2395 case -EINPROGRESS: 2396 case -EALREADY: 2397 xprt_unlock_connect(xprt, transport); 2398 return; 2399 case -EINVAL: 2400 /* Happens, for instance, if the user specified a link 2401 * local IPv6 address without a scope-id. 2402 */ 2403 case -ECONNREFUSED: 2404 case -ECONNRESET: 2405 case -ENETDOWN: 2406 case -ENETUNREACH: 2407 case -EHOSTUNREACH: 2408 case -EADDRINUSE: 2409 case -ENOBUFS: 2410 /* 2411 * xs_tcp_force_close() wakes tasks with -EIO. 2412 * We need to wake them first to ensure the 2413 * correct error code. 2414 */ 2415 xprt_wake_pending_tasks(xprt, status); 2416 xs_tcp_force_close(xprt); 2417 goto out; 2418 } 2419 status = -EAGAIN; 2420 out: 2421 xprt_clear_connecting(xprt); 2422 xprt_unlock_connect(xprt, transport); 2423 xprt_wake_pending_tasks(xprt, status); 2424 } 2425 2426 /** 2427 * xs_connect - connect a socket to a remote endpoint 2428 * @xprt: pointer to transport structure 2429 * @task: address of RPC task that manages state of connect request 2430 * 2431 * TCP: If the remote end dropped the connection, delay reconnecting. 2432 * 2433 * UDP socket connects are synchronous, but we use a work queue anyway 2434 * to guarantee that even unprivileged user processes can set up a 2435 * socket on a privileged port. 2436 * 2437 * If a UDP socket connect fails, the delay behavior here prevents 2438 * retry floods (hard mounts). 2439 */ 2440 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2441 { 2442 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2443 unsigned long delay = 0; 2444 2445 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2446 2447 if (transport->sock != NULL) { 2448 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2449 "seconds\n", 2450 xprt, xprt->reestablish_timeout / HZ); 2451 2452 /* Start by resetting any existing state */ 2453 xs_reset_transport(transport); 2454 2455 delay = xprt_reconnect_delay(xprt); 2456 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); 2457 2458 } else 2459 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2460 2461 queue_delayed_work(xprtiod_workqueue, 2462 &transport->connect_worker, 2463 delay); 2464 } 2465 2466 static void xs_wake_disconnect(struct sock_xprt *transport) 2467 { 2468 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state)) 2469 xs_tcp_force_close(&transport->xprt); 2470 } 2471 2472 static void xs_wake_write(struct sock_xprt *transport) 2473 { 2474 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state)) 2475 xprt_write_space(&transport->xprt); 2476 } 2477 2478 static void xs_wake_error(struct sock_xprt *transport) 2479 { 2480 int sockerr; 2481 2482 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2483 return; 2484 mutex_lock(&transport->recv_mutex); 2485 if (transport->sock == NULL) 2486 goto out; 2487 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2488 goto out; 2489 sockerr = xchg(&transport->xprt_err, 0); 2490 if (sockerr < 0) 2491 xprt_wake_pending_tasks(&transport->xprt, sockerr); 2492 out: 2493 mutex_unlock(&transport->recv_mutex); 2494 } 2495 2496 static void xs_wake_pending(struct sock_xprt *transport) 2497 { 2498 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state)) 2499 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN); 2500 } 2501 2502 static void xs_error_handle(struct work_struct *work) 2503 { 2504 struct sock_xprt *transport = container_of(work, 2505 struct sock_xprt, error_worker); 2506 2507 xs_wake_disconnect(transport); 2508 xs_wake_write(transport); 2509 xs_wake_error(transport); 2510 xs_wake_pending(transport); 2511 } 2512 2513 /** 2514 * xs_local_print_stats - display AF_LOCAL socket-specifc stats 2515 * @xprt: rpc_xprt struct containing statistics 2516 * @seq: output file 2517 * 2518 */ 2519 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2520 { 2521 long idle_time = 0; 2522 2523 if (xprt_connected(xprt)) 2524 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2525 2526 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2527 "%llu %llu %lu %llu %llu\n", 2528 xprt->stat.bind_count, 2529 xprt->stat.connect_count, 2530 xprt->stat.connect_time / HZ, 2531 idle_time, 2532 xprt->stat.sends, 2533 xprt->stat.recvs, 2534 xprt->stat.bad_xids, 2535 xprt->stat.req_u, 2536 xprt->stat.bklog_u, 2537 xprt->stat.max_slots, 2538 xprt->stat.sending_u, 2539 xprt->stat.pending_u); 2540 } 2541 2542 /** 2543 * xs_udp_print_stats - display UDP socket-specifc stats 2544 * @xprt: rpc_xprt struct containing statistics 2545 * @seq: output file 2546 * 2547 */ 2548 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2549 { 2550 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2551 2552 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2553 "%lu %llu %llu\n", 2554 transport->srcport, 2555 xprt->stat.bind_count, 2556 xprt->stat.sends, 2557 xprt->stat.recvs, 2558 xprt->stat.bad_xids, 2559 xprt->stat.req_u, 2560 xprt->stat.bklog_u, 2561 xprt->stat.max_slots, 2562 xprt->stat.sending_u, 2563 xprt->stat.pending_u); 2564 } 2565 2566 /** 2567 * xs_tcp_print_stats - display TCP socket-specifc stats 2568 * @xprt: rpc_xprt struct containing statistics 2569 * @seq: output file 2570 * 2571 */ 2572 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2573 { 2574 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2575 long idle_time = 0; 2576 2577 if (xprt_connected(xprt)) 2578 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2579 2580 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2581 "%llu %llu %lu %llu %llu\n", 2582 transport->srcport, 2583 xprt->stat.bind_count, 2584 xprt->stat.connect_count, 2585 xprt->stat.connect_time / HZ, 2586 idle_time, 2587 xprt->stat.sends, 2588 xprt->stat.recvs, 2589 xprt->stat.bad_xids, 2590 xprt->stat.req_u, 2591 xprt->stat.bklog_u, 2592 xprt->stat.max_slots, 2593 xprt->stat.sending_u, 2594 xprt->stat.pending_u); 2595 } 2596 2597 /* 2598 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2599 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2600 * to use the server side send routines. 2601 */ 2602 static int bc_malloc(struct rpc_task *task) 2603 { 2604 struct rpc_rqst *rqst = task->tk_rqstp; 2605 size_t size = rqst->rq_callsize; 2606 struct page *page; 2607 struct rpc_buffer *buf; 2608 2609 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2610 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2611 size); 2612 return -EINVAL; 2613 } 2614 2615 page = alloc_page(GFP_KERNEL); 2616 if (!page) 2617 return -ENOMEM; 2618 2619 buf = page_address(page); 2620 buf->len = PAGE_SIZE; 2621 2622 rqst->rq_buffer = buf->data; 2623 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2624 return 0; 2625 } 2626 2627 /* 2628 * Free the space allocated in the bc_alloc routine 2629 */ 2630 static void bc_free(struct rpc_task *task) 2631 { 2632 void *buffer = task->tk_rqstp->rq_buffer; 2633 struct rpc_buffer *buf; 2634 2635 buf = container_of(buffer, struct rpc_buffer, data); 2636 free_page((unsigned long)buf); 2637 } 2638 2639 /* 2640 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex 2641 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request. 2642 */ 2643 static int bc_sendto(struct rpc_rqst *req) 2644 { 2645 int len; 2646 struct xdr_buf *xbufp = &req->rq_snd_buf; 2647 struct sock_xprt *transport = 2648 container_of(req->rq_xprt, struct sock_xprt, xprt); 2649 unsigned long headoff; 2650 unsigned long tailoff; 2651 struct page *tailpage; 2652 struct msghdr msg = { 2653 .msg_flags = MSG_MORE 2654 }; 2655 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | 2656 (u32)xbufp->len); 2657 struct kvec iov = { 2658 .iov_base = &marker, 2659 .iov_len = sizeof(marker), 2660 }; 2661 2662 req->rq_xtime = ktime_get(); 2663 2664 len = kernel_sendmsg(transport->sock, &msg, &iov, 1, iov.iov_len); 2665 if (len != iov.iov_len) 2666 return -EAGAIN; 2667 2668 tailpage = NULL; 2669 if (xbufp->tail[0].iov_len) 2670 tailpage = virt_to_page(xbufp->tail[0].iov_base); 2671 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK; 2672 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK; 2673 len = svc_send_common(transport->sock, xbufp, 2674 virt_to_page(xbufp->head[0].iov_base), headoff, 2675 tailpage, tailoff); 2676 if (len != xbufp->len) 2677 return -EAGAIN; 2678 return len; 2679 } 2680 2681 /* 2682 * The send routine. Borrows from svc_send 2683 */ 2684 static int bc_send_request(struct rpc_rqst *req) 2685 { 2686 struct svc_xprt *xprt; 2687 int len; 2688 2689 /* 2690 * Get the server socket associated with this callback xprt 2691 */ 2692 xprt = req->rq_xprt->bc_xprt; 2693 2694 /* 2695 * Grab the mutex to serialize data as the connection is shared 2696 * with the fore channel 2697 */ 2698 mutex_lock(&xprt->xpt_mutex); 2699 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2700 len = -ENOTCONN; 2701 else 2702 len = bc_sendto(req); 2703 mutex_unlock(&xprt->xpt_mutex); 2704 2705 if (len > 0) 2706 len = 0; 2707 2708 return len; 2709 } 2710 2711 /* 2712 * The close routine. Since this is client initiated, we do nothing 2713 */ 2714 2715 static void bc_close(struct rpc_xprt *xprt) 2716 { 2717 } 2718 2719 /* 2720 * The xprt destroy routine. Again, because this connection is client 2721 * initiated, we do nothing 2722 */ 2723 2724 static void bc_destroy(struct rpc_xprt *xprt) 2725 { 2726 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2727 2728 xs_xprt_free(xprt); 2729 module_put(THIS_MODULE); 2730 } 2731 2732 static const struct rpc_xprt_ops xs_local_ops = { 2733 .reserve_xprt = xprt_reserve_xprt, 2734 .release_xprt = xprt_release_xprt, 2735 .alloc_slot = xprt_alloc_slot, 2736 .free_slot = xprt_free_slot, 2737 .rpcbind = xs_local_rpcbind, 2738 .set_port = xs_local_set_port, 2739 .connect = xs_local_connect, 2740 .buf_alloc = rpc_malloc, 2741 .buf_free = rpc_free, 2742 .prepare_request = xs_stream_prepare_request, 2743 .send_request = xs_local_send_request, 2744 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2745 .close = xs_close, 2746 .destroy = xs_destroy, 2747 .print_stats = xs_local_print_stats, 2748 .enable_swap = xs_enable_swap, 2749 .disable_swap = xs_disable_swap, 2750 }; 2751 2752 static const struct rpc_xprt_ops xs_udp_ops = { 2753 .set_buffer_size = xs_udp_set_buffer_size, 2754 .reserve_xprt = xprt_reserve_xprt_cong, 2755 .release_xprt = xprt_release_xprt_cong, 2756 .alloc_slot = xprt_alloc_slot, 2757 .free_slot = xprt_free_slot, 2758 .rpcbind = rpcb_getport_async, 2759 .set_port = xs_set_port, 2760 .connect = xs_connect, 2761 .buf_alloc = rpc_malloc, 2762 .buf_free = rpc_free, 2763 .send_request = xs_udp_send_request, 2764 .wait_for_reply_request = xprt_wait_for_reply_request_rtt, 2765 .timer = xs_udp_timer, 2766 .release_request = xprt_release_rqst_cong, 2767 .close = xs_close, 2768 .destroy = xs_destroy, 2769 .print_stats = xs_udp_print_stats, 2770 .enable_swap = xs_enable_swap, 2771 .disable_swap = xs_disable_swap, 2772 .inject_disconnect = xs_inject_disconnect, 2773 }; 2774 2775 static const struct rpc_xprt_ops xs_tcp_ops = { 2776 .reserve_xprt = xprt_reserve_xprt, 2777 .release_xprt = xprt_release_xprt, 2778 .alloc_slot = xprt_alloc_slot, 2779 .free_slot = xprt_free_slot, 2780 .rpcbind = rpcb_getport_async, 2781 .set_port = xs_set_port, 2782 .connect = xs_connect, 2783 .buf_alloc = rpc_malloc, 2784 .buf_free = rpc_free, 2785 .prepare_request = xs_stream_prepare_request, 2786 .send_request = xs_tcp_send_request, 2787 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2788 .close = xs_tcp_shutdown, 2789 .destroy = xs_destroy, 2790 .set_connect_timeout = xs_tcp_set_connect_timeout, 2791 .print_stats = xs_tcp_print_stats, 2792 .enable_swap = xs_enable_swap, 2793 .disable_swap = xs_disable_swap, 2794 .inject_disconnect = xs_inject_disconnect, 2795 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2796 .bc_setup = xprt_setup_bc, 2797 .bc_maxpayload = xs_tcp_bc_maxpayload, 2798 .bc_num_slots = xprt_bc_max_slots, 2799 .bc_free_rqst = xprt_free_bc_rqst, 2800 .bc_destroy = xprt_destroy_bc, 2801 #endif 2802 }; 2803 2804 /* 2805 * The rpc_xprt_ops for the server backchannel 2806 */ 2807 2808 static const struct rpc_xprt_ops bc_tcp_ops = { 2809 .reserve_xprt = xprt_reserve_xprt, 2810 .release_xprt = xprt_release_xprt, 2811 .alloc_slot = xprt_alloc_slot, 2812 .free_slot = xprt_free_slot, 2813 .buf_alloc = bc_malloc, 2814 .buf_free = bc_free, 2815 .send_request = bc_send_request, 2816 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2817 .close = bc_close, 2818 .destroy = bc_destroy, 2819 .print_stats = xs_tcp_print_stats, 2820 .enable_swap = xs_enable_swap, 2821 .disable_swap = xs_disable_swap, 2822 .inject_disconnect = xs_inject_disconnect, 2823 }; 2824 2825 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2826 { 2827 static const struct sockaddr_in sin = { 2828 .sin_family = AF_INET, 2829 .sin_addr.s_addr = htonl(INADDR_ANY), 2830 }; 2831 static const struct sockaddr_in6 sin6 = { 2832 .sin6_family = AF_INET6, 2833 .sin6_addr = IN6ADDR_ANY_INIT, 2834 }; 2835 2836 switch (family) { 2837 case AF_LOCAL: 2838 break; 2839 case AF_INET: 2840 memcpy(sap, &sin, sizeof(sin)); 2841 break; 2842 case AF_INET6: 2843 memcpy(sap, &sin6, sizeof(sin6)); 2844 break; 2845 default: 2846 dprintk("RPC: %s: Bad address family\n", __func__); 2847 return -EAFNOSUPPORT; 2848 } 2849 return 0; 2850 } 2851 2852 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2853 unsigned int slot_table_size, 2854 unsigned int max_slot_table_size) 2855 { 2856 struct rpc_xprt *xprt; 2857 struct sock_xprt *new; 2858 2859 if (args->addrlen > sizeof(xprt->addr)) { 2860 dprintk("RPC: xs_setup_xprt: address too large\n"); 2861 return ERR_PTR(-EBADF); 2862 } 2863 2864 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2865 max_slot_table_size); 2866 if (xprt == NULL) { 2867 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2868 "rpc_xprt\n"); 2869 return ERR_PTR(-ENOMEM); 2870 } 2871 2872 new = container_of(xprt, struct sock_xprt, xprt); 2873 mutex_init(&new->recv_mutex); 2874 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2875 xprt->addrlen = args->addrlen; 2876 if (args->srcaddr) 2877 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2878 else { 2879 int err; 2880 err = xs_init_anyaddr(args->dstaddr->sa_family, 2881 (struct sockaddr *)&new->srcaddr); 2882 if (err != 0) { 2883 xprt_free(xprt); 2884 return ERR_PTR(err); 2885 } 2886 } 2887 2888 return xprt; 2889 } 2890 2891 static const struct rpc_timeout xs_local_default_timeout = { 2892 .to_initval = 10 * HZ, 2893 .to_maxval = 10 * HZ, 2894 .to_retries = 2, 2895 }; 2896 2897 /** 2898 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2899 * @args: rpc transport creation arguments 2900 * 2901 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2902 */ 2903 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2904 { 2905 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2906 struct sock_xprt *transport; 2907 struct rpc_xprt *xprt; 2908 struct rpc_xprt *ret; 2909 2910 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2911 xprt_max_tcp_slot_table_entries); 2912 if (IS_ERR(xprt)) 2913 return xprt; 2914 transport = container_of(xprt, struct sock_xprt, xprt); 2915 2916 xprt->prot = 0; 2917 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2918 2919 xprt->bind_timeout = XS_BIND_TO; 2920 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2921 xprt->idle_timeout = XS_IDLE_DISC_TO; 2922 2923 xprt->ops = &xs_local_ops; 2924 xprt->timeout = &xs_local_default_timeout; 2925 2926 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2927 INIT_WORK(&transport->error_worker, xs_error_handle); 2928 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); 2929 2930 switch (sun->sun_family) { 2931 case AF_LOCAL: 2932 if (sun->sun_path[0] != '/') { 2933 dprintk("RPC: bad AF_LOCAL address: %s\n", 2934 sun->sun_path); 2935 ret = ERR_PTR(-EINVAL); 2936 goto out_err; 2937 } 2938 xprt_set_bound(xprt); 2939 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2940 ret = ERR_PTR(xs_local_setup_socket(transport)); 2941 if (ret) 2942 goto out_err; 2943 break; 2944 default: 2945 ret = ERR_PTR(-EAFNOSUPPORT); 2946 goto out_err; 2947 } 2948 2949 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2950 xprt->address_strings[RPC_DISPLAY_ADDR]); 2951 2952 if (try_module_get(THIS_MODULE)) 2953 return xprt; 2954 ret = ERR_PTR(-EINVAL); 2955 out_err: 2956 xs_xprt_free(xprt); 2957 return ret; 2958 } 2959 2960 static const struct rpc_timeout xs_udp_default_timeout = { 2961 .to_initval = 5 * HZ, 2962 .to_maxval = 30 * HZ, 2963 .to_increment = 5 * HZ, 2964 .to_retries = 5, 2965 }; 2966 2967 /** 2968 * xs_setup_udp - Set up transport to use a UDP socket 2969 * @args: rpc transport creation arguments 2970 * 2971 */ 2972 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2973 { 2974 struct sockaddr *addr = args->dstaddr; 2975 struct rpc_xprt *xprt; 2976 struct sock_xprt *transport; 2977 struct rpc_xprt *ret; 2978 2979 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2980 xprt_udp_slot_table_entries); 2981 if (IS_ERR(xprt)) 2982 return xprt; 2983 transport = container_of(xprt, struct sock_xprt, xprt); 2984 2985 xprt->prot = IPPROTO_UDP; 2986 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2987 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2988 2989 xprt->bind_timeout = XS_BIND_TO; 2990 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2991 xprt->idle_timeout = XS_IDLE_DISC_TO; 2992 2993 xprt->ops = &xs_udp_ops; 2994 2995 xprt->timeout = &xs_udp_default_timeout; 2996 2997 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2998 INIT_WORK(&transport->error_worker, xs_error_handle); 2999 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 3000 3001 switch (addr->sa_family) { 3002 case AF_INET: 3003 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3004 xprt_set_bound(xprt); 3005 3006 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 3007 break; 3008 case AF_INET6: 3009 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3010 xprt_set_bound(xprt); 3011 3012 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 3013 break; 3014 default: 3015 ret = ERR_PTR(-EAFNOSUPPORT); 3016 goto out_err; 3017 } 3018 3019 if (xprt_bound(xprt)) 3020 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3021 xprt->address_strings[RPC_DISPLAY_ADDR], 3022 xprt->address_strings[RPC_DISPLAY_PORT], 3023 xprt->address_strings[RPC_DISPLAY_PROTO]); 3024 else 3025 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3026 xprt->address_strings[RPC_DISPLAY_ADDR], 3027 xprt->address_strings[RPC_DISPLAY_PROTO]); 3028 3029 if (try_module_get(THIS_MODULE)) 3030 return xprt; 3031 ret = ERR_PTR(-EINVAL); 3032 out_err: 3033 xs_xprt_free(xprt); 3034 return ret; 3035 } 3036 3037 static const struct rpc_timeout xs_tcp_default_timeout = { 3038 .to_initval = 60 * HZ, 3039 .to_maxval = 60 * HZ, 3040 .to_retries = 2, 3041 }; 3042 3043 /** 3044 * xs_setup_tcp - Set up transport to use a TCP socket 3045 * @args: rpc transport creation arguments 3046 * 3047 */ 3048 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 3049 { 3050 struct sockaddr *addr = args->dstaddr; 3051 struct rpc_xprt *xprt; 3052 struct sock_xprt *transport; 3053 struct rpc_xprt *ret; 3054 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 3055 3056 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 3057 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 3058 3059 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3060 max_slot_table_size); 3061 if (IS_ERR(xprt)) 3062 return xprt; 3063 transport = container_of(xprt, struct sock_xprt, xprt); 3064 3065 xprt->prot = IPPROTO_TCP; 3066 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3067 3068 xprt->bind_timeout = XS_BIND_TO; 3069 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3070 xprt->idle_timeout = XS_IDLE_DISC_TO; 3071 3072 xprt->ops = &xs_tcp_ops; 3073 xprt->timeout = &xs_tcp_default_timeout; 3074 3075 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3076 xprt->connect_timeout = xprt->timeout->to_initval * 3077 (xprt->timeout->to_retries + 1); 3078 3079 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 3080 INIT_WORK(&transport->error_worker, xs_error_handle); 3081 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3082 3083 switch (addr->sa_family) { 3084 case AF_INET: 3085 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3086 xprt_set_bound(xprt); 3087 3088 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3089 break; 3090 case AF_INET6: 3091 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3092 xprt_set_bound(xprt); 3093 3094 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3095 break; 3096 default: 3097 ret = ERR_PTR(-EAFNOSUPPORT); 3098 goto out_err; 3099 } 3100 3101 if (xprt_bound(xprt)) 3102 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3103 xprt->address_strings[RPC_DISPLAY_ADDR], 3104 xprt->address_strings[RPC_DISPLAY_PORT], 3105 xprt->address_strings[RPC_DISPLAY_PROTO]); 3106 else 3107 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3108 xprt->address_strings[RPC_DISPLAY_ADDR], 3109 xprt->address_strings[RPC_DISPLAY_PROTO]); 3110 3111 if (try_module_get(THIS_MODULE)) 3112 return xprt; 3113 ret = ERR_PTR(-EINVAL); 3114 out_err: 3115 xs_xprt_free(xprt); 3116 return ret; 3117 } 3118 3119 /** 3120 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3121 * @args: rpc transport creation arguments 3122 * 3123 */ 3124 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3125 { 3126 struct sockaddr *addr = args->dstaddr; 3127 struct rpc_xprt *xprt; 3128 struct sock_xprt *transport; 3129 struct svc_sock *bc_sock; 3130 struct rpc_xprt *ret; 3131 3132 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3133 xprt_tcp_slot_table_entries); 3134 if (IS_ERR(xprt)) 3135 return xprt; 3136 transport = container_of(xprt, struct sock_xprt, xprt); 3137 3138 xprt->prot = IPPROTO_TCP; 3139 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3140 xprt->timeout = &xs_tcp_default_timeout; 3141 3142 /* backchannel */ 3143 xprt_set_bound(xprt); 3144 xprt->bind_timeout = 0; 3145 xprt->reestablish_timeout = 0; 3146 xprt->idle_timeout = 0; 3147 3148 xprt->ops = &bc_tcp_ops; 3149 3150 switch (addr->sa_family) { 3151 case AF_INET: 3152 xs_format_peer_addresses(xprt, "tcp", 3153 RPCBIND_NETID_TCP); 3154 break; 3155 case AF_INET6: 3156 xs_format_peer_addresses(xprt, "tcp", 3157 RPCBIND_NETID_TCP6); 3158 break; 3159 default: 3160 ret = ERR_PTR(-EAFNOSUPPORT); 3161 goto out_err; 3162 } 3163 3164 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3165 xprt->address_strings[RPC_DISPLAY_ADDR], 3166 xprt->address_strings[RPC_DISPLAY_PORT], 3167 xprt->address_strings[RPC_DISPLAY_PROTO]); 3168 3169 /* 3170 * Once we've associated a backchannel xprt with a connection, 3171 * we want to keep it around as long as the connection lasts, 3172 * in case we need to start using it for a backchannel again; 3173 * this reference won't be dropped until bc_xprt is destroyed. 3174 */ 3175 xprt_get(xprt); 3176 args->bc_xprt->xpt_bc_xprt = xprt; 3177 xprt->bc_xprt = args->bc_xprt; 3178 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3179 transport->sock = bc_sock->sk_sock; 3180 transport->inet = bc_sock->sk_sk; 3181 3182 /* 3183 * Since we don't want connections for the backchannel, we set 3184 * the xprt status to connected 3185 */ 3186 xprt_set_connected(xprt); 3187 3188 if (try_module_get(THIS_MODULE)) 3189 return xprt; 3190 3191 args->bc_xprt->xpt_bc_xprt = NULL; 3192 args->bc_xprt->xpt_bc_xps = NULL; 3193 xprt_put(xprt); 3194 ret = ERR_PTR(-EINVAL); 3195 out_err: 3196 xs_xprt_free(xprt); 3197 return ret; 3198 } 3199 3200 static struct xprt_class xs_local_transport = { 3201 .list = LIST_HEAD_INIT(xs_local_transport.list), 3202 .name = "named UNIX socket", 3203 .owner = THIS_MODULE, 3204 .ident = XPRT_TRANSPORT_LOCAL, 3205 .setup = xs_setup_local, 3206 }; 3207 3208 static struct xprt_class xs_udp_transport = { 3209 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3210 .name = "udp", 3211 .owner = THIS_MODULE, 3212 .ident = XPRT_TRANSPORT_UDP, 3213 .setup = xs_setup_udp, 3214 }; 3215 3216 static struct xprt_class xs_tcp_transport = { 3217 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3218 .name = "tcp", 3219 .owner = THIS_MODULE, 3220 .ident = XPRT_TRANSPORT_TCP, 3221 .setup = xs_setup_tcp, 3222 }; 3223 3224 static struct xprt_class xs_bc_tcp_transport = { 3225 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3226 .name = "tcp NFSv4.1 backchannel", 3227 .owner = THIS_MODULE, 3228 .ident = XPRT_TRANSPORT_BC_TCP, 3229 .setup = xs_setup_bc_tcp, 3230 }; 3231 3232 /** 3233 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3234 * 3235 */ 3236 int init_socket_xprt(void) 3237 { 3238 if (!sunrpc_table_header) 3239 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3240 3241 xprt_register_transport(&xs_local_transport); 3242 xprt_register_transport(&xs_udp_transport); 3243 xprt_register_transport(&xs_tcp_transport); 3244 xprt_register_transport(&xs_bc_tcp_transport); 3245 3246 return 0; 3247 } 3248 3249 /** 3250 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3251 * 3252 */ 3253 void cleanup_socket_xprt(void) 3254 { 3255 if (sunrpc_table_header) { 3256 unregister_sysctl_table(sunrpc_table_header); 3257 sunrpc_table_header = NULL; 3258 } 3259 3260 xprt_unregister_transport(&xs_local_transport); 3261 xprt_unregister_transport(&xs_udp_transport); 3262 xprt_unregister_transport(&xs_tcp_transport); 3263 xprt_unregister_transport(&xs_bc_tcp_transport); 3264 } 3265 3266 static int param_set_uint_minmax(const char *val, 3267 const struct kernel_param *kp, 3268 unsigned int min, unsigned int max) 3269 { 3270 unsigned int num; 3271 int ret; 3272 3273 if (!val) 3274 return -EINVAL; 3275 ret = kstrtouint(val, 0, &num); 3276 if (ret) 3277 return ret; 3278 if (num < min || num > max) 3279 return -EINVAL; 3280 *((unsigned int *)kp->arg) = num; 3281 return 0; 3282 } 3283 3284 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3285 { 3286 return param_set_uint_minmax(val, kp, 3287 RPC_MIN_RESVPORT, 3288 RPC_MAX_RESVPORT); 3289 } 3290 3291 static const struct kernel_param_ops param_ops_portnr = { 3292 .set = param_set_portnr, 3293 .get = param_get_uint, 3294 }; 3295 3296 #define param_check_portnr(name, p) \ 3297 __param_check(name, p, unsigned int); 3298 3299 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3300 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3301 3302 static int param_set_slot_table_size(const char *val, 3303 const struct kernel_param *kp) 3304 { 3305 return param_set_uint_minmax(val, kp, 3306 RPC_MIN_SLOT_TABLE, 3307 RPC_MAX_SLOT_TABLE); 3308 } 3309 3310 static const struct kernel_param_ops param_ops_slot_table_size = { 3311 .set = param_set_slot_table_size, 3312 .get = param_get_uint, 3313 }; 3314 3315 #define param_check_slot_table_size(name, p) \ 3316 __param_check(name, p, unsigned int); 3317 3318 static int param_set_max_slot_table_size(const char *val, 3319 const struct kernel_param *kp) 3320 { 3321 return param_set_uint_minmax(val, kp, 3322 RPC_MIN_SLOT_TABLE, 3323 RPC_MAX_SLOT_TABLE_LIMIT); 3324 } 3325 3326 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3327 .set = param_set_max_slot_table_size, 3328 .get = param_get_uint, 3329 }; 3330 3331 #define param_check_max_slot_table_size(name, p) \ 3332 __param_check(name, p, unsigned int); 3333 3334 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3335 slot_table_size, 0644); 3336 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3337 max_slot_table_size, 0644); 3338 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3339 slot_table_size, 0644); 3340