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