1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/net/sunrpc/xprtsock.c 4 * 5 * Client-side transport implementation for sockets. 6 * 7 * TCP callback races fixes (C) 1998 Red Hat 8 * TCP send fixes (C) 1998 Red Hat 9 * TCP NFS related read + write fixes 10 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> 11 * 12 * Rewrite of larges part of the code in order to stabilize TCP stuff. 13 * Fix behaviour when socket buffer is full. 14 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> 15 * 16 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> 17 * 18 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. 19 * <gilles.quillard@bull.net> 20 */ 21 22 #include <linux/types.h> 23 #include <linux/string.h> 24 #include <linux/slab.h> 25 #include <linux/module.h> 26 #include <linux/capability.h> 27 #include <linux/pagemap.h> 28 #include <linux/errno.h> 29 #include <linux/socket.h> 30 #include <linux/in.h> 31 #include <linux/net.h> 32 #include <linux/mm.h> 33 #include <linux/un.h> 34 #include <linux/udp.h> 35 #include <linux/tcp.h> 36 #include <linux/sunrpc/clnt.h> 37 #include <linux/sunrpc/addr.h> 38 #include <linux/sunrpc/sched.h> 39 #include <linux/sunrpc/svcsock.h> 40 #include <linux/sunrpc/xprtsock.h> 41 #include <linux/file.h> 42 #ifdef CONFIG_SUNRPC_BACKCHANNEL 43 #include <linux/sunrpc/bc_xprt.h> 44 #endif 45 46 #include <net/sock.h> 47 #include <net/checksum.h> 48 #include <net/udp.h> 49 #include <net/tcp.h> 50 #include <linux/bvec.h> 51 #include <linux/highmem.h> 52 #include <linux/uio.h> 53 #include <linux/sched/mm.h> 54 55 #include <trace/events/sunrpc.h> 56 57 #include "socklib.h" 58 #include "sunrpc.h" 59 60 static void xs_close(struct rpc_xprt *xprt); 61 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock); 62 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 63 struct socket *sock); 64 65 /* 66 * xprtsock tunables 67 */ 68 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 69 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 70 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 71 72 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 73 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 74 75 #define XS_TCP_LINGER_TO (15U * HZ) 76 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 77 78 /* 79 * We can register our own files under /proc/sys/sunrpc by 80 * calling register_sysctl_table() again. The files in that 81 * directory become the union of all files registered there. 82 * 83 * We simply need to make sure that we don't collide with 84 * someone else's file names! 85 */ 86 87 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 88 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 89 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 90 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 91 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 92 93 static struct ctl_table_header *sunrpc_table_header; 94 95 static struct xprt_class xs_local_transport; 96 static struct xprt_class xs_udp_transport; 97 static struct xprt_class xs_tcp_transport; 98 static struct xprt_class xs_bc_tcp_transport; 99 100 /* 101 * FIXME: changing the UDP slot table size should also resize the UDP 102 * socket buffers for existing UDP transports 103 */ 104 static struct ctl_table xs_tunables_table[] = { 105 { 106 .procname = "udp_slot_table_entries", 107 .data = &xprt_udp_slot_table_entries, 108 .maxlen = sizeof(unsigned int), 109 .mode = 0644, 110 .proc_handler = proc_dointvec_minmax, 111 .extra1 = &min_slot_table_size, 112 .extra2 = &max_slot_table_size 113 }, 114 { 115 .procname = "tcp_slot_table_entries", 116 .data = &xprt_tcp_slot_table_entries, 117 .maxlen = sizeof(unsigned int), 118 .mode = 0644, 119 .proc_handler = proc_dointvec_minmax, 120 .extra1 = &min_slot_table_size, 121 .extra2 = &max_slot_table_size 122 }, 123 { 124 .procname = "tcp_max_slot_table_entries", 125 .data = &xprt_max_tcp_slot_table_entries, 126 .maxlen = sizeof(unsigned int), 127 .mode = 0644, 128 .proc_handler = proc_dointvec_minmax, 129 .extra1 = &min_slot_table_size, 130 .extra2 = &max_tcp_slot_table_limit 131 }, 132 { 133 .procname = "min_resvport", 134 .data = &xprt_min_resvport, 135 .maxlen = sizeof(unsigned int), 136 .mode = 0644, 137 .proc_handler = proc_dointvec_minmax, 138 .extra1 = &xprt_min_resvport_limit, 139 .extra2 = &xprt_max_resvport_limit 140 }, 141 { 142 .procname = "max_resvport", 143 .data = &xprt_max_resvport, 144 .maxlen = sizeof(unsigned int), 145 .mode = 0644, 146 .proc_handler = proc_dointvec_minmax, 147 .extra1 = &xprt_min_resvport_limit, 148 .extra2 = &xprt_max_resvport_limit 149 }, 150 { 151 .procname = "tcp_fin_timeout", 152 .data = &xs_tcp_fin_timeout, 153 .maxlen = sizeof(xs_tcp_fin_timeout), 154 .mode = 0644, 155 .proc_handler = proc_dointvec_jiffies, 156 }, 157 { }, 158 }; 159 160 static struct ctl_table sunrpc_table[] = { 161 { 162 .procname = "sunrpc", 163 .mode = 0555, 164 .child = xs_tunables_table 165 }, 166 { }, 167 }; 168 169 /* 170 * Wait duration for a reply from the RPC portmapper. 171 */ 172 #define XS_BIND_TO (60U * HZ) 173 174 /* 175 * Delay if a UDP socket connect error occurs. This is most likely some 176 * kind of resource problem on the local host. 177 */ 178 #define XS_UDP_REEST_TO (2U * HZ) 179 180 /* 181 * The reestablish timeout allows clients to delay for a bit before attempting 182 * to reconnect to a server that just dropped our connection. 183 * 184 * We implement an exponential backoff when trying to reestablish a TCP 185 * transport connection with the server. Some servers like to drop a TCP 186 * connection when they are overworked, so we start with a short timeout and 187 * increase over time if the server is down or not responding. 188 */ 189 #define XS_TCP_INIT_REEST_TO (3U * HZ) 190 191 /* 192 * TCP idle timeout; client drops the transport socket if it is idle 193 * for this long. Note that we also timeout UDP sockets to prevent 194 * holding port numbers when there is no RPC traffic. 195 */ 196 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 197 198 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 199 # undef RPC_DEBUG_DATA 200 # define RPCDBG_FACILITY RPCDBG_TRANS 201 #endif 202 203 #ifdef RPC_DEBUG_DATA 204 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 205 { 206 u8 *buf = (u8 *) packet; 207 int j; 208 209 dprintk("RPC: %s\n", msg); 210 for (j = 0; j < count && j < 128; j += 4) { 211 if (!(j & 31)) { 212 if (j) 213 dprintk("\n"); 214 dprintk("0x%04x ", j); 215 } 216 dprintk("%02x%02x%02x%02x ", 217 buf[j], buf[j+1], buf[j+2], buf[j+3]); 218 } 219 dprintk("\n"); 220 } 221 #else 222 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 223 { 224 /* NOP */ 225 } 226 #endif 227 228 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 229 { 230 return (struct rpc_xprt *) sk->sk_user_data; 231 } 232 233 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 234 { 235 return (struct sockaddr *) &xprt->addr; 236 } 237 238 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 239 { 240 return (struct sockaddr_un *) &xprt->addr; 241 } 242 243 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 244 { 245 return (struct sockaddr_in *) &xprt->addr; 246 } 247 248 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 249 { 250 return (struct sockaddr_in6 *) &xprt->addr; 251 } 252 253 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 254 { 255 struct sockaddr *sap = xs_addr(xprt); 256 struct sockaddr_in6 *sin6; 257 struct sockaddr_in *sin; 258 struct sockaddr_un *sun; 259 char buf[128]; 260 261 switch (sap->sa_family) { 262 case AF_LOCAL: 263 sun = xs_addr_un(xprt); 264 strlcpy(buf, sun->sun_path, sizeof(buf)); 265 xprt->address_strings[RPC_DISPLAY_ADDR] = 266 kstrdup(buf, GFP_KERNEL); 267 break; 268 case AF_INET: 269 (void)rpc_ntop(sap, buf, sizeof(buf)); 270 xprt->address_strings[RPC_DISPLAY_ADDR] = 271 kstrdup(buf, GFP_KERNEL); 272 sin = xs_addr_in(xprt); 273 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 274 break; 275 case AF_INET6: 276 (void)rpc_ntop(sap, buf, sizeof(buf)); 277 xprt->address_strings[RPC_DISPLAY_ADDR] = 278 kstrdup(buf, GFP_KERNEL); 279 sin6 = xs_addr_in6(xprt); 280 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 281 break; 282 default: 283 BUG(); 284 } 285 286 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 287 } 288 289 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 290 { 291 struct sockaddr *sap = xs_addr(xprt); 292 char buf[128]; 293 294 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 295 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 296 297 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 298 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 299 } 300 301 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 302 const char *protocol, 303 const char *netid) 304 { 305 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 306 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 307 xs_format_common_peer_addresses(xprt); 308 xs_format_common_peer_ports(xprt); 309 } 310 311 static void xs_update_peer_port(struct rpc_xprt *xprt) 312 { 313 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 314 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 315 316 xs_format_common_peer_ports(xprt); 317 } 318 319 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 320 { 321 unsigned int i; 322 323 for (i = 0; i < RPC_DISPLAY_MAX; i++) 324 switch (i) { 325 case RPC_DISPLAY_PROTO: 326 case RPC_DISPLAY_NETID: 327 continue; 328 default: 329 kfree(xprt->address_strings[i]); 330 } 331 } 332 333 static size_t 334 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) 335 { 336 size_t i,n; 337 338 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) 339 return want; 340 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; 341 for (i = 0; i < n; i++) { 342 if (buf->pages[i]) 343 continue; 344 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); 345 if (!buf->pages[i]) { 346 i *= PAGE_SIZE; 347 return i > buf->page_base ? i - buf->page_base : 0; 348 } 349 } 350 return want; 351 } 352 353 static ssize_t 354 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) 355 { 356 ssize_t ret; 357 if (seek != 0) 358 iov_iter_advance(&msg->msg_iter, seek); 359 ret = sock_recvmsg(sock, msg, flags); 360 return ret > 0 ? ret + seek : ret; 361 } 362 363 static ssize_t 364 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, 365 struct kvec *kvec, size_t count, size_t seek) 366 { 367 iov_iter_kvec(&msg->msg_iter, READ, kvec, 1, count); 368 return xs_sock_recvmsg(sock, msg, flags, seek); 369 } 370 371 static ssize_t 372 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, 373 struct bio_vec *bvec, unsigned long nr, size_t count, 374 size_t seek) 375 { 376 iov_iter_bvec(&msg->msg_iter, READ, bvec, nr, count); 377 return xs_sock_recvmsg(sock, msg, flags, seek); 378 } 379 380 static ssize_t 381 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, 382 size_t count) 383 { 384 iov_iter_discard(&msg->msg_iter, READ, count); 385 return sock_recvmsg(sock, msg, flags); 386 } 387 388 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 389 static void 390 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 391 { 392 struct bvec_iter bi = { 393 .bi_size = count, 394 }; 395 struct bio_vec bv; 396 397 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); 398 for_each_bvec(bv, bvec, bi, bi) 399 flush_dcache_page(bv.bv_page); 400 } 401 #else 402 static inline void 403 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 404 { 405 } 406 #endif 407 408 static ssize_t 409 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, 410 struct xdr_buf *buf, size_t count, size_t seek, size_t *read) 411 { 412 size_t want, seek_init = seek, offset = 0; 413 ssize_t ret; 414 415 want = min_t(size_t, count, buf->head[0].iov_len); 416 if (seek < want) { 417 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); 418 if (ret <= 0) 419 goto sock_err; 420 offset += ret; 421 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 422 goto out; 423 if (ret != want) 424 goto out; 425 seek = 0; 426 } else { 427 seek -= want; 428 offset += want; 429 } 430 431 want = xs_alloc_sparse_pages( 432 buf, min_t(size_t, count - offset, buf->page_len), 433 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); 434 if (seek < want) { 435 ret = xs_read_bvec(sock, msg, flags, buf->bvec, 436 xdr_buf_pagecount(buf), 437 want + buf->page_base, 438 seek + buf->page_base); 439 if (ret <= 0) 440 goto sock_err; 441 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); 442 ret -= buf->page_base; 443 offset += ret; 444 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 445 goto out; 446 if (ret != want) 447 goto out; 448 seek = 0; 449 } else { 450 seek -= want; 451 offset += want; 452 } 453 454 want = min_t(size_t, count - offset, buf->tail[0].iov_len); 455 if (seek < want) { 456 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); 457 if (ret <= 0) 458 goto sock_err; 459 offset += ret; 460 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 461 goto out; 462 if (ret != want) 463 goto out; 464 } else if (offset < seek_init) 465 offset = seek_init; 466 ret = -EMSGSIZE; 467 out: 468 *read = offset - seek_init; 469 return ret; 470 sock_err: 471 offset += seek; 472 goto out; 473 } 474 475 static void 476 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) 477 { 478 if (!transport->recv.copied) { 479 if (buf->head[0].iov_len >= transport->recv.offset) 480 memcpy(buf->head[0].iov_base, 481 &transport->recv.xid, 482 transport->recv.offset); 483 transport->recv.copied = transport->recv.offset; 484 } 485 } 486 487 static bool 488 xs_read_stream_request_done(struct sock_xprt *transport) 489 { 490 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); 491 } 492 493 static void 494 xs_read_stream_check_eor(struct sock_xprt *transport, 495 struct msghdr *msg) 496 { 497 if (xs_read_stream_request_done(transport)) 498 msg->msg_flags |= MSG_EOR; 499 } 500 501 static ssize_t 502 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, 503 int flags, struct rpc_rqst *req) 504 { 505 struct xdr_buf *buf = &req->rq_private_buf; 506 size_t want, read; 507 ssize_t ret; 508 509 xs_read_header(transport, buf); 510 511 want = transport->recv.len - transport->recv.offset; 512 if (want != 0) { 513 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, 514 transport->recv.copied + want, 515 transport->recv.copied, 516 &read); 517 transport->recv.offset += read; 518 transport->recv.copied += read; 519 } 520 521 if (transport->recv.offset == transport->recv.len) 522 xs_read_stream_check_eor(transport, msg); 523 524 if (want == 0) 525 return 0; 526 527 switch (ret) { 528 default: 529 break; 530 case -EFAULT: 531 case -EMSGSIZE: 532 msg->msg_flags |= MSG_TRUNC; 533 return read; 534 case 0: 535 return -ESHUTDOWN; 536 } 537 return ret < 0 ? ret : read; 538 } 539 540 static size_t 541 xs_read_stream_headersize(bool isfrag) 542 { 543 if (isfrag) 544 return sizeof(__be32); 545 return 3 * sizeof(__be32); 546 } 547 548 static ssize_t 549 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, 550 int flags, size_t want, size_t seek) 551 { 552 struct kvec kvec = { 553 .iov_base = &transport->recv.fraghdr, 554 .iov_len = want, 555 }; 556 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); 557 } 558 559 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 560 static ssize_t 561 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 562 { 563 struct rpc_xprt *xprt = &transport->xprt; 564 struct rpc_rqst *req; 565 ssize_t ret; 566 567 /* Is this transport associated with the backchannel? */ 568 if (!xprt->bc_serv) 569 return -ESHUTDOWN; 570 571 /* Look up and lock the request corresponding to the given XID */ 572 req = xprt_lookup_bc_request(xprt, transport->recv.xid); 573 if (!req) { 574 printk(KERN_WARNING "Callback slot table overflowed\n"); 575 return -ESHUTDOWN; 576 } 577 if (transport->recv.copied && !req->rq_private_buf.len) 578 return -ESHUTDOWN; 579 580 ret = xs_read_stream_request(transport, msg, flags, req); 581 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 582 xprt_complete_bc_request(req, transport->recv.copied); 583 else 584 req->rq_private_buf.len = transport->recv.copied; 585 586 return ret; 587 } 588 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 589 static ssize_t 590 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 591 { 592 return -ESHUTDOWN; 593 } 594 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 595 596 static ssize_t 597 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) 598 { 599 struct rpc_xprt *xprt = &transport->xprt; 600 struct rpc_rqst *req; 601 ssize_t ret = 0; 602 603 /* Look up and lock the request corresponding to the given XID */ 604 spin_lock(&xprt->queue_lock); 605 req = xprt_lookup_rqst(xprt, transport->recv.xid); 606 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) { 607 msg->msg_flags |= MSG_TRUNC; 608 goto out; 609 } 610 xprt_pin_rqst(req); 611 spin_unlock(&xprt->queue_lock); 612 613 ret = xs_read_stream_request(transport, msg, flags, req); 614 615 spin_lock(&xprt->queue_lock); 616 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 617 xprt_complete_rqst(req->rq_task, transport->recv.copied); 618 else 619 req->rq_private_buf.len = transport->recv.copied; 620 xprt_unpin_rqst(req); 621 out: 622 spin_unlock(&xprt->queue_lock); 623 return ret; 624 } 625 626 static ssize_t 627 xs_read_stream(struct sock_xprt *transport, int flags) 628 { 629 struct msghdr msg = { 0 }; 630 size_t want, read = 0; 631 ssize_t ret = 0; 632 633 if (transport->recv.len == 0) { 634 want = xs_read_stream_headersize(transport->recv.copied != 0); 635 ret = xs_read_stream_header(transport, &msg, flags, want, 636 transport->recv.offset); 637 if (ret <= 0) 638 goto out_err; 639 transport->recv.offset = ret; 640 if (transport->recv.offset != want) 641 return transport->recv.offset; 642 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & 643 RPC_FRAGMENT_SIZE_MASK; 644 transport->recv.offset -= sizeof(transport->recv.fraghdr); 645 read = ret; 646 } 647 648 switch (be32_to_cpu(transport->recv.calldir)) { 649 default: 650 msg.msg_flags |= MSG_TRUNC; 651 break; 652 case RPC_CALL: 653 ret = xs_read_stream_call(transport, &msg, flags); 654 break; 655 case RPC_REPLY: 656 ret = xs_read_stream_reply(transport, &msg, flags); 657 } 658 if (msg.msg_flags & MSG_TRUNC) { 659 transport->recv.calldir = cpu_to_be32(-1); 660 transport->recv.copied = -1; 661 } 662 if (ret < 0) 663 goto out_err; 664 read += ret; 665 if (transport->recv.offset < transport->recv.len) { 666 if (!(msg.msg_flags & MSG_TRUNC)) 667 return read; 668 msg.msg_flags = 0; 669 ret = xs_read_discard(transport->sock, &msg, flags, 670 transport->recv.len - transport->recv.offset); 671 if (ret <= 0) 672 goto out_err; 673 transport->recv.offset += ret; 674 read += ret; 675 if (transport->recv.offset != transport->recv.len) 676 return read; 677 } 678 if (xs_read_stream_request_done(transport)) { 679 trace_xs_stream_read_request(transport); 680 transport->recv.copied = 0; 681 } 682 transport->recv.offset = 0; 683 transport->recv.len = 0; 684 return read; 685 out_err: 686 return ret != 0 ? ret : -ESHUTDOWN; 687 } 688 689 static __poll_t xs_poll_socket(struct sock_xprt *transport) 690 { 691 return transport->sock->ops->poll(transport->file, transport->sock, 692 NULL); 693 } 694 695 static bool xs_poll_socket_readable(struct sock_xprt *transport) 696 { 697 __poll_t events = xs_poll_socket(transport); 698 699 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); 700 } 701 702 static void xs_poll_check_readable(struct sock_xprt *transport) 703 { 704 705 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 706 if (!xs_poll_socket_readable(transport)) 707 return; 708 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 709 queue_work(xprtiod_workqueue, &transport->recv_worker); 710 } 711 712 static void xs_stream_data_receive(struct sock_xprt *transport) 713 { 714 size_t read = 0; 715 ssize_t ret = 0; 716 717 mutex_lock(&transport->recv_mutex); 718 if (transport->sock == NULL) 719 goto out; 720 for (;;) { 721 ret = xs_read_stream(transport, MSG_DONTWAIT); 722 if (ret < 0) 723 break; 724 read += ret; 725 cond_resched(); 726 } 727 if (ret == -ESHUTDOWN) 728 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 729 else 730 xs_poll_check_readable(transport); 731 out: 732 mutex_unlock(&transport->recv_mutex); 733 trace_xs_stream_read_data(&transport->xprt, ret, read); 734 } 735 736 static void xs_stream_data_receive_workfn(struct work_struct *work) 737 { 738 struct sock_xprt *transport = 739 container_of(work, struct sock_xprt, recv_worker); 740 unsigned int pflags = memalloc_nofs_save(); 741 742 xs_stream_data_receive(transport); 743 memalloc_nofs_restore(pflags); 744 } 745 746 static void 747 xs_stream_reset_connect(struct sock_xprt *transport) 748 { 749 transport->recv.offset = 0; 750 transport->recv.len = 0; 751 transport->recv.copied = 0; 752 transport->xmit.offset = 0; 753 } 754 755 static void 756 xs_stream_start_connect(struct sock_xprt *transport) 757 { 758 transport->xprt.stat.connect_count++; 759 transport->xprt.stat.connect_start = jiffies; 760 } 761 762 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 763 764 /** 765 * xs_nospace - handle transmit was incomplete 766 * @req: pointer to RPC request 767 * @transport: pointer to struct sock_xprt 768 * 769 */ 770 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport) 771 { 772 struct rpc_xprt *xprt = &transport->xprt; 773 struct sock *sk = transport->inet; 774 int ret = -EAGAIN; 775 776 trace_rpc_socket_nospace(req, transport); 777 778 /* Protect against races with write_space */ 779 spin_lock(&xprt->transport_lock); 780 781 /* Don't race with disconnect */ 782 if (xprt_connected(xprt)) { 783 /* wait for more buffer space */ 784 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state); 785 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 786 sk->sk_write_pending++; 787 xprt_wait_for_buffer_space(xprt); 788 } else 789 ret = -ENOTCONN; 790 791 spin_unlock(&xprt->transport_lock); 792 return ret; 793 } 794 795 static int xs_sock_nospace(struct rpc_rqst *req) 796 { 797 struct sock_xprt *transport = 798 container_of(req->rq_xprt, struct sock_xprt, xprt); 799 struct sock *sk = transport->inet; 800 int ret = -EAGAIN; 801 802 lock_sock(sk); 803 if (!sock_writeable(sk)) 804 ret = xs_nospace(req, transport); 805 release_sock(sk); 806 return ret; 807 } 808 809 static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait) 810 { 811 struct sock_xprt *transport = 812 container_of(req->rq_xprt, struct sock_xprt, xprt); 813 struct sock *sk = transport->inet; 814 int ret = -EAGAIN; 815 816 if (vm_wait) 817 return -ENOBUFS; 818 lock_sock(sk); 819 if (!sk_stream_memory_free(sk)) 820 ret = xs_nospace(req, transport); 821 release_sock(sk); 822 return ret; 823 } 824 825 static int 826 xs_stream_prepare_request(struct rpc_rqst *req) 827 { 828 gfp_t gfp = rpc_task_gfp_mask(); 829 int ret; 830 831 ret = xdr_alloc_bvec(&req->rq_snd_buf, gfp); 832 if (ret < 0) 833 return ret; 834 xdr_free_bvec(&req->rq_rcv_buf); 835 return xdr_alloc_bvec(&req->rq_rcv_buf, gfp); 836 } 837 838 /* 839 * Determine if the previous message in the stream was aborted before it 840 * could complete transmission. 841 */ 842 static bool 843 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) 844 { 845 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; 846 } 847 848 /* 849 * Return the stream record marker field for a record of length < 2^31-1 850 */ 851 static rpc_fraghdr 852 xs_stream_record_marker(struct xdr_buf *xdr) 853 { 854 if (!xdr->len) 855 return 0; 856 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); 857 } 858 859 /** 860 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 861 * @req: pointer to RPC request 862 * 863 * Return values: 864 * 0: The request has been sent 865 * EAGAIN: The socket was blocked, please call again later to 866 * complete the request 867 * ENOTCONN: Caller needs to invoke connect logic then call again 868 * other: Some other error occurred, the request was not sent 869 */ 870 static int xs_local_send_request(struct rpc_rqst *req) 871 { 872 struct rpc_xprt *xprt = req->rq_xprt; 873 struct sock_xprt *transport = 874 container_of(xprt, struct sock_xprt, xprt); 875 struct xdr_buf *xdr = &req->rq_snd_buf; 876 rpc_fraghdr rm = xs_stream_record_marker(xdr); 877 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 878 struct msghdr msg = { 879 .msg_flags = XS_SENDMSG_FLAGS, 880 }; 881 bool vm_wait; 882 unsigned int sent; 883 int status; 884 885 /* Close the stream if the previous transmission was incomplete */ 886 if (xs_send_request_was_aborted(transport, req)) { 887 xprt_force_disconnect(xprt); 888 return -ENOTCONN; 889 } 890 891 xs_pktdump("packet data:", 892 req->rq_svec->iov_base, req->rq_svec->iov_len); 893 894 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false; 895 896 req->rq_xtime = ktime_get(); 897 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 898 transport->xmit.offset, rm, &sent); 899 dprintk("RPC: %s(%u) = %d\n", 900 __func__, xdr->len - transport->xmit.offset, status); 901 902 if (likely(sent > 0) || status == 0) { 903 transport->xmit.offset += sent; 904 req->rq_bytes_sent = transport->xmit.offset; 905 if (likely(req->rq_bytes_sent >= msglen)) { 906 req->rq_xmit_bytes_sent += transport->xmit.offset; 907 transport->xmit.offset = 0; 908 return 0; 909 } 910 status = -EAGAIN; 911 vm_wait = false; 912 } 913 914 switch (status) { 915 case -EAGAIN: 916 status = xs_stream_nospace(req, vm_wait); 917 break; 918 default: 919 dprintk("RPC: sendmsg returned unrecognized error %d\n", 920 -status); 921 fallthrough; 922 case -EPIPE: 923 xprt_force_disconnect(xprt); 924 status = -ENOTCONN; 925 } 926 927 return status; 928 } 929 930 /** 931 * xs_udp_send_request - write an RPC request to a UDP socket 932 * @req: pointer to RPC request 933 * 934 * Return values: 935 * 0: The request has been sent 936 * EAGAIN: The socket was blocked, please call again later to 937 * complete the request 938 * ENOTCONN: Caller needs to invoke connect logic then call again 939 * other: Some other error occurred, the request was not sent 940 */ 941 static int xs_udp_send_request(struct rpc_rqst *req) 942 { 943 struct rpc_xprt *xprt = req->rq_xprt; 944 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 945 struct xdr_buf *xdr = &req->rq_snd_buf; 946 struct msghdr msg = { 947 .msg_name = xs_addr(xprt), 948 .msg_namelen = xprt->addrlen, 949 .msg_flags = XS_SENDMSG_FLAGS, 950 }; 951 unsigned int sent; 952 int status; 953 954 xs_pktdump("packet data:", 955 req->rq_svec->iov_base, 956 req->rq_svec->iov_len); 957 958 if (!xprt_bound(xprt)) 959 return -ENOTCONN; 960 961 if (!xprt_request_get_cong(xprt, req)) 962 return -EBADSLT; 963 964 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask()); 965 if (status < 0) 966 return status; 967 req->rq_xtime = ktime_get(); 968 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent); 969 970 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 971 xdr->len, status); 972 973 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 974 if (status == -EPERM) 975 goto process_status; 976 977 if (status == -EAGAIN && sock_writeable(transport->inet)) 978 status = -ENOBUFS; 979 980 if (sent > 0 || status == 0) { 981 req->rq_xmit_bytes_sent += sent; 982 if (sent >= req->rq_slen) 983 return 0; 984 /* Still some bytes left; set up for a retry later. */ 985 status = -EAGAIN; 986 } 987 988 process_status: 989 switch (status) { 990 case -ENOTSOCK: 991 status = -ENOTCONN; 992 /* Should we call xs_close() here? */ 993 break; 994 case -EAGAIN: 995 status = xs_sock_nospace(req); 996 break; 997 case -ENETUNREACH: 998 case -ENOBUFS: 999 case -EPIPE: 1000 case -ECONNREFUSED: 1001 case -EPERM: 1002 /* When the server has died, an ICMP port unreachable message 1003 * prompts ECONNREFUSED. */ 1004 break; 1005 default: 1006 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1007 -status); 1008 } 1009 1010 return status; 1011 } 1012 1013 /** 1014 * xs_tcp_send_request - write an RPC request to a TCP socket 1015 * @req: pointer to RPC request 1016 * 1017 * Return values: 1018 * 0: The request has been sent 1019 * EAGAIN: The socket was blocked, please call again later to 1020 * complete the request 1021 * ENOTCONN: Caller needs to invoke connect logic then call again 1022 * other: Some other error occurred, the request was not sent 1023 * 1024 * XXX: In the case of soft timeouts, should we eventually give up 1025 * if sendmsg is not able to make progress? 1026 */ 1027 static int xs_tcp_send_request(struct rpc_rqst *req) 1028 { 1029 struct rpc_xprt *xprt = req->rq_xprt; 1030 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1031 struct xdr_buf *xdr = &req->rq_snd_buf; 1032 rpc_fraghdr rm = xs_stream_record_marker(xdr); 1033 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 1034 struct msghdr msg = { 1035 .msg_flags = XS_SENDMSG_FLAGS, 1036 }; 1037 bool vm_wait; 1038 unsigned int sent; 1039 int status; 1040 1041 /* Close the stream if the previous transmission was incomplete */ 1042 if (xs_send_request_was_aborted(transport, req)) { 1043 if (transport->sock != NULL) 1044 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 1045 return -ENOTCONN; 1046 } 1047 if (!transport->inet) 1048 return -ENOTCONN; 1049 1050 xs_pktdump("packet data:", 1051 req->rq_svec->iov_base, 1052 req->rq_svec->iov_len); 1053 1054 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 1055 xs_tcp_set_socket_timeouts(xprt, transport->sock); 1056 1057 xs_set_srcport(transport, transport->sock); 1058 1059 /* Continue transmitting the packet/record. We must be careful 1060 * to cope with writespace callbacks arriving _after_ we have 1061 * called sendmsg(). */ 1062 req->rq_xtime = ktime_get(); 1063 tcp_sock_set_cork(transport->inet, true); 1064 1065 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false; 1066 1067 do { 1068 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 1069 transport->xmit.offset, rm, &sent); 1070 1071 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 1072 xdr->len - transport->xmit.offset, status); 1073 1074 /* If we've sent the entire packet, immediately 1075 * reset the count of bytes sent. */ 1076 transport->xmit.offset += sent; 1077 req->rq_bytes_sent = transport->xmit.offset; 1078 if (likely(req->rq_bytes_sent >= msglen)) { 1079 req->rq_xmit_bytes_sent += transport->xmit.offset; 1080 transport->xmit.offset = 0; 1081 if (atomic_long_read(&xprt->xmit_queuelen) == 1) 1082 tcp_sock_set_cork(transport->inet, false); 1083 return 0; 1084 } 1085 1086 WARN_ON_ONCE(sent == 0 && status == 0); 1087 1088 if (sent > 0) 1089 vm_wait = false; 1090 1091 } while (status == 0); 1092 1093 switch (status) { 1094 case -ENOTSOCK: 1095 status = -ENOTCONN; 1096 /* Should we call xs_close() here? */ 1097 break; 1098 case -EAGAIN: 1099 status = xs_stream_nospace(req, vm_wait); 1100 break; 1101 case -ECONNRESET: 1102 case -ECONNREFUSED: 1103 case -ENOTCONN: 1104 case -EADDRINUSE: 1105 case -ENOBUFS: 1106 case -EPIPE: 1107 break; 1108 default: 1109 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1110 -status); 1111 } 1112 1113 return status; 1114 } 1115 1116 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1117 { 1118 transport->old_data_ready = sk->sk_data_ready; 1119 transport->old_state_change = sk->sk_state_change; 1120 transport->old_write_space = sk->sk_write_space; 1121 transport->old_error_report = sk->sk_error_report; 1122 } 1123 1124 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1125 { 1126 sk->sk_data_ready = transport->old_data_ready; 1127 sk->sk_state_change = transport->old_state_change; 1128 sk->sk_write_space = transport->old_write_space; 1129 sk->sk_error_report = transport->old_error_report; 1130 } 1131 1132 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 1133 { 1134 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1135 1136 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1137 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state); 1138 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state); 1139 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state); 1140 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state); 1141 } 1142 1143 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr) 1144 { 1145 set_bit(nr, &transport->sock_state); 1146 queue_work(xprtiod_workqueue, &transport->error_worker); 1147 } 1148 1149 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1150 { 1151 xprt->connect_cookie++; 1152 smp_mb__before_atomic(); 1153 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1154 clear_bit(XPRT_CLOSING, &xprt->state); 1155 xs_sock_reset_state_flags(xprt); 1156 smp_mb__after_atomic(); 1157 } 1158 1159 /** 1160 * xs_error_report - callback to handle TCP socket state errors 1161 * @sk: socket 1162 * 1163 * Note: we don't call sock_error() since there may be a rpc_task 1164 * using the socket, and so we don't want to clear sk->sk_err. 1165 */ 1166 static void xs_error_report(struct sock *sk) 1167 { 1168 struct sock_xprt *transport; 1169 struct rpc_xprt *xprt; 1170 1171 if (!(xprt = xprt_from_sock(sk))) 1172 return; 1173 1174 transport = container_of(xprt, struct sock_xprt, xprt); 1175 transport->xprt_err = -sk->sk_err; 1176 if (transport->xprt_err == 0) 1177 return; 1178 dprintk("RPC: xs_error_report client %p, error=%d...\n", 1179 xprt, -transport->xprt_err); 1180 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err); 1181 1182 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */ 1183 smp_mb__before_atomic(); 1184 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR); 1185 } 1186 1187 static void xs_reset_transport(struct sock_xprt *transport) 1188 { 1189 struct socket *sock = transport->sock; 1190 struct sock *sk = transport->inet; 1191 struct rpc_xprt *xprt = &transport->xprt; 1192 struct file *filp = transport->file; 1193 1194 if (sk == NULL) 1195 return; 1196 /* 1197 * Make sure we're calling this in a context from which it is safe 1198 * to call __fput_sync(). In practice that means rpciod and the 1199 * system workqueue. 1200 */ 1201 if (!(current->flags & PF_WQ_WORKER)) { 1202 WARN_ON_ONCE(1); 1203 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 1204 return; 1205 } 1206 1207 if (atomic_read(&transport->xprt.swapper)) 1208 sk_clear_memalloc(sk); 1209 1210 kernel_sock_shutdown(sock, SHUT_RDWR); 1211 1212 mutex_lock(&transport->recv_mutex); 1213 lock_sock(sk); 1214 transport->inet = NULL; 1215 transport->sock = NULL; 1216 transport->file = NULL; 1217 1218 sk->sk_user_data = NULL; 1219 1220 xs_restore_old_callbacks(transport, sk); 1221 xprt_clear_connected(xprt); 1222 xs_sock_reset_connection_flags(xprt); 1223 /* Reset stream record info */ 1224 xs_stream_reset_connect(transport); 1225 release_sock(sk); 1226 mutex_unlock(&transport->recv_mutex); 1227 1228 trace_rpc_socket_close(xprt, sock); 1229 __fput_sync(filp); 1230 1231 xprt_disconnect_done(xprt); 1232 } 1233 1234 /** 1235 * xs_close - close a socket 1236 * @xprt: transport 1237 * 1238 * This is used when all requests are complete; ie, no DRC state remains 1239 * on the server we want to save. 1240 * 1241 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 1242 * xs_reset_transport() zeroing the socket from underneath a writer. 1243 */ 1244 static void xs_close(struct rpc_xprt *xprt) 1245 { 1246 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1247 1248 dprintk("RPC: xs_close xprt %p\n", xprt); 1249 1250 xs_reset_transport(transport); 1251 xprt->reestablish_timeout = 0; 1252 } 1253 1254 static void xs_inject_disconnect(struct rpc_xprt *xprt) 1255 { 1256 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 1257 xprt); 1258 xprt_disconnect_done(xprt); 1259 } 1260 1261 static void xs_xprt_free(struct rpc_xprt *xprt) 1262 { 1263 xs_free_peer_addresses(xprt); 1264 xprt_free(xprt); 1265 } 1266 1267 /** 1268 * xs_destroy - prepare to shutdown a transport 1269 * @xprt: doomed transport 1270 * 1271 */ 1272 static void xs_destroy(struct rpc_xprt *xprt) 1273 { 1274 struct sock_xprt *transport = container_of(xprt, 1275 struct sock_xprt, xprt); 1276 dprintk("RPC: xs_destroy xprt %p\n", xprt); 1277 1278 cancel_delayed_work_sync(&transport->connect_worker); 1279 xs_close(xprt); 1280 cancel_work_sync(&transport->recv_worker); 1281 cancel_work_sync(&transport->error_worker); 1282 xs_xprt_free(xprt); 1283 module_put(THIS_MODULE); 1284 } 1285 1286 /** 1287 * xs_udp_data_read_skb - receive callback for UDP sockets 1288 * @xprt: transport 1289 * @sk: socket 1290 * @skb: skbuff 1291 * 1292 */ 1293 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1294 struct sock *sk, 1295 struct sk_buff *skb) 1296 { 1297 struct rpc_task *task; 1298 struct rpc_rqst *rovr; 1299 int repsize, copied; 1300 u32 _xid; 1301 __be32 *xp; 1302 1303 repsize = skb->len; 1304 if (repsize < 4) { 1305 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1306 return; 1307 } 1308 1309 /* Copy the XID from the skb... */ 1310 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1311 if (xp == NULL) 1312 return; 1313 1314 /* Look up and lock the request corresponding to the given XID */ 1315 spin_lock(&xprt->queue_lock); 1316 rovr = xprt_lookup_rqst(xprt, *xp); 1317 if (!rovr) 1318 goto out_unlock; 1319 xprt_pin_rqst(rovr); 1320 xprt_update_rtt(rovr->rq_task); 1321 spin_unlock(&xprt->queue_lock); 1322 task = rovr->rq_task; 1323 1324 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1325 copied = repsize; 1326 1327 /* Suck it into the iovec, verify checksum if not done by hw. */ 1328 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1329 spin_lock(&xprt->queue_lock); 1330 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1331 goto out_unpin; 1332 } 1333 1334 1335 spin_lock(&xprt->transport_lock); 1336 xprt_adjust_cwnd(xprt, task, copied); 1337 spin_unlock(&xprt->transport_lock); 1338 spin_lock(&xprt->queue_lock); 1339 xprt_complete_rqst(task, copied); 1340 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1341 out_unpin: 1342 xprt_unpin_rqst(rovr); 1343 out_unlock: 1344 spin_unlock(&xprt->queue_lock); 1345 } 1346 1347 static void xs_udp_data_receive(struct sock_xprt *transport) 1348 { 1349 struct sk_buff *skb; 1350 struct sock *sk; 1351 int err; 1352 1353 mutex_lock(&transport->recv_mutex); 1354 sk = transport->inet; 1355 if (sk == NULL) 1356 goto out; 1357 for (;;) { 1358 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err); 1359 if (skb == NULL) 1360 break; 1361 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1362 consume_skb(skb); 1363 cond_resched(); 1364 } 1365 xs_poll_check_readable(transport); 1366 out: 1367 mutex_unlock(&transport->recv_mutex); 1368 } 1369 1370 static void xs_udp_data_receive_workfn(struct work_struct *work) 1371 { 1372 struct sock_xprt *transport = 1373 container_of(work, struct sock_xprt, recv_worker); 1374 unsigned int pflags = memalloc_nofs_save(); 1375 1376 xs_udp_data_receive(transport); 1377 memalloc_nofs_restore(pflags); 1378 } 1379 1380 /** 1381 * xs_data_ready - "data ready" callback for UDP sockets 1382 * @sk: socket with data to read 1383 * 1384 */ 1385 static void xs_data_ready(struct sock *sk) 1386 { 1387 struct rpc_xprt *xprt; 1388 1389 dprintk("RPC: xs_data_ready...\n"); 1390 xprt = xprt_from_sock(sk); 1391 if (xprt != NULL) { 1392 struct sock_xprt *transport = container_of(xprt, 1393 struct sock_xprt, xprt); 1394 transport->old_data_ready(sk); 1395 /* Any data means we had a useful conversation, so 1396 * then we don't need to delay the next reconnect 1397 */ 1398 if (xprt->reestablish_timeout) 1399 xprt->reestablish_timeout = 0; 1400 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1401 queue_work(xprtiod_workqueue, &transport->recv_worker); 1402 } 1403 } 1404 1405 /* 1406 * Helper function to force a TCP close if the server is sending 1407 * junk and/or it has put us in CLOSE_WAIT 1408 */ 1409 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1410 { 1411 xprt_force_disconnect(xprt); 1412 } 1413 1414 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1415 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1416 { 1417 return PAGE_SIZE; 1418 } 1419 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1420 1421 /** 1422 * xs_local_state_change - callback to handle AF_LOCAL socket state changes 1423 * @sk: socket whose state has changed 1424 * 1425 */ 1426 static void xs_local_state_change(struct sock *sk) 1427 { 1428 struct rpc_xprt *xprt; 1429 struct sock_xprt *transport; 1430 1431 if (!(xprt = xprt_from_sock(sk))) 1432 return; 1433 transport = container_of(xprt, struct sock_xprt, xprt); 1434 if (sk->sk_shutdown & SHUTDOWN_MASK) { 1435 clear_bit(XPRT_CONNECTED, &xprt->state); 1436 /* Trigger the socket release */ 1437 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1438 } 1439 } 1440 1441 /** 1442 * xs_tcp_state_change - callback to handle TCP socket state changes 1443 * @sk: socket whose state has changed 1444 * 1445 */ 1446 static void xs_tcp_state_change(struct sock *sk) 1447 { 1448 struct rpc_xprt *xprt; 1449 struct sock_xprt *transport; 1450 1451 if (!(xprt = xprt_from_sock(sk))) 1452 return; 1453 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1454 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1455 sk->sk_state, xprt_connected(xprt), 1456 sock_flag(sk, SOCK_DEAD), 1457 sock_flag(sk, SOCK_ZAPPED), 1458 sk->sk_shutdown); 1459 1460 transport = container_of(xprt, struct sock_xprt, xprt); 1461 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1462 switch (sk->sk_state) { 1463 case TCP_ESTABLISHED: 1464 if (!xprt_test_and_set_connected(xprt)) { 1465 xprt->connect_cookie++; 1466 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1467 xprt_clear_connecting(xprt); 1468 1469 xprt->stat.connect_count++; 1470 xprt->stat.connect_time += (long)jiffies - 1471 xprt->stat.connect_start; 1472 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING); 1473 } 1474 break; 1475 case TCP_FIN_WAIT1: 1476 /* The client initiated a shutdown of the socket */ 1477 xprt->connect_cookie++; 1478 xprt->reestablish_timeout = 0; 1479 set_bit(XPRT_CLOSING, &xprt->state); 1480 smp_mb__before_atomic(); 1481 clear_bit(XPRT_CONNECTED, &xprt->state); 1482 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1483 smp_mb__after_atomic(); 1484 break; 1485 case TCP_CLOSE_WAIT: 1486 /* The server initiated a shutdown of the socket */ 1487 xprt->connect_cookie++; 1488 clear_bit(XPRT_CONNECTED, &xprt->state); 1489 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1490 fallthrough; 1491 case TCP_CLOSING: 1492 /* 1493 * If the server closed down the connection, make sure that 1494 * we back off before reconnecting 1495 */ 1496 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1497 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1498 break; 1499 case TCP_LAST_ACK: 1500 set_bit(XPRT_CLOSING, &xprt->state); 1501 smp_mb__before_atomic(); 1502 clear_bit(XPRT_CONNECTED, &xprt->state); 1503 smp_mb__after_atomic(); 1504 break; 1505 case TCP_CLOSE: 1506 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1507 &transport->sock_state)) 1508 xprt_clear_connecting(xprt); 1509 clear_bit(XPRT_CLOSING, &xprt->state); 1510 /* Trigger the socket release */ 1511 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1512 } 1513 } 1514 1515 static void xs_write_space(struct sock *sk) 1516 { 1517 struct sock_xprt *transport; 1518 struct rpc_xprt *xprt; 1519 1520 if (!sk->sk_socket) 1521 return; 1522 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1523 1524 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1525 return; 1526 transport = container_of(xprt, struct sock_xprt, xprt); 1527 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state)) 1528 return; 1529 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE); 1530 sk->sk_write_pending--; 1531 } 1532 1533 /** 1534 * xs_udp_write_space - callback invoked when socket buffer space 1535 * becomes available 1536 * @sk: socket whose state has changed 1537 * 1538 * Called when more output buffer space is available for this socket. 1539 * We try not to wake our writers until they can make "significant" 1540 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1541 * with a bunch of small requests. 1542 */ 1543 static void xs_udp_write_space(struct sock *sk) 1544 { 1545 /* from net/core/sock.c:sock_def_write_space */ 1546 if (sock_writeable(sk)) 1547 xs_write_space(sk); 1548 } 1549 1550 /** 1551 * xs_tcp_write_space - callback invoked when socket buffer space 1552 * becomes available 1553 * @sk: socket whose state has changed 1554 * 1555 * Called when more output buffer space is available for this socket. 1556 * We try not to wake our writers until they can make "significant" 1557 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1558 * with a bunch of small requests. 1559 */ 1560 static void xs_tcp_write_space(struct sock *sk) 1561 { 1562 /* from net/core/stream.c:sk_stream_write_space */ 1563 if (sk_stream_is_writeable(sk)) 1564 xs_write_space(sk); 1565 } 1566 1567 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1568 { 1569 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1570 struct sock *sk = transport->inet; 1571 1572 if (transport->rcvsize) { 1573 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1574 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1575 } 1576 if (transport->sndsize) { 1577 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1578 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1579 sk->sk_write_space(sk); 1580 } 1581 } 1582 1583 /** 1584 * xs_udp_set_buffer_size - set send and receive limits 1585 * @xprt: generic transport 1586 * @sndsize: requested size of send buffer, in bytes 1587 * @rcvsize: requested size of receive buffer, in bytes 1588 * 1589 * Set socket send and receive buffer size limits. 1590 */ 1591 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1592 { 1593 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1594 1595 transport->sndsize = 0; 1596 if (sndsize) 1597 transport->sndsize = sndsize + 1024; 1598 transport->rcvsize = 0; 1599 if (rcvsize) 1600 transport->rcvsize = rcvsize + 1024; 1601 1602 xs_udp_do_set_buffer_size(xprt); 1603 } 1604 1605 /** 1606 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1607 * @xprt: controlling transport 1608 * @task: task that timed out 1609 * 1610 * Adjust the congestion window after a retransmit timeout has occurred. 1611 */ 1612 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1613 { 1614 spin_lock(&xprt->transport_lock); 1615 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1616 spin_unlock(&xprt->transport_lock); 1617 } 1618 1619 static int xs_get_random_port(void) 1620 { 1621 unsigned short min = xprt_min_resvport, max = xprt_max_resvport; 1622 unsigned short range; 1623 unsigned short rand; 1624 1625 if (max < min) 1626 return -EADDRINUSE; 1627 range = max - min + 1; 1628 rand = (unsigned short) prandom_u32() % range; 1629 return rand + min; 1630 } 1631 1632 static unsigned short xs_sock_getport(struct socket *sock) 1633 { 1634 struct sockaddr_storage buf; 1635 unsigned short port = 0; 1636 1637 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) 1638 goto out; 1639 switch (buf.ss_family) { 1640 case AF_INET6: 1641 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1642 break; 1643 case AF_INET: 1644 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1645 } 1646 out: 1647 return port; 1648 } 1649 1650 /** 1651 * xs_set_port - reset the port number in the remote endpoint address 1652 * @xprt: generic transport 1653 * @port: new port number 1654 * 1655 */ 1656 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1657 { 1658 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1659 1660 rpc_set_port(xs_addr(xprt), port); 1661 xs_update_peer_port(xprt); 1662 } 1663 1664 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1665 { 1666 if (transport->srcport == 0 && transport->xprt.reuseport) 1667 transport->srcport = xs_sock_getport(sock); 1668 } 1669 1670 static int xs_get_srcport(struct sock_xprt *transport) 1671 { 1672 int port = transport->srcport; 1673 1674 if (port == 0 && transport->xprt.resvport) 1675 port = xs_get_random_port(); 1676 return port; 1677 } 1678 1679 static unsigned short xs_sock_srcport(struct rpc_xprt *xprt) 1680 { 1681 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1682 unsigned short ret = 0; 1683 mutex_lock(&sock->recv_mutex); 1684 if (sock->sock) 1685 ret = xs_sock_getport(sock->sock); 1686 mutex_unlock(&sock->recv_mutex); 1687 return ret; 1688 } 1689 1690 static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen) 1691 { 1692 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1693 union { 1694 struct sockaddr sa; 1695 struct sockaddr_storage st; 1696 } saddr; 1697 int ret = -ENOTCONN; 1698 1699 mutex_lock(&sock->recv_mutex); 1700 if (sock->sock) { 1701 ret = kernel_getsockname(sock->sock, &saddr.sa); 1702 if (ret >= 0) 1703 ret = snprintf(buf, buflen, "%pISc", &saddr.sa); 1704 } 1705 mutex_unlock(&sock->recv_mutex); 1706 return ret; 1707 } 1708 1709 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1710 { 1711 if (transport->srcport != 0) 1712 transport->srcport = 0; 1713 if (!transport->xprt.resvport) 1714 return 0; 1715 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1716 return xprt_max_resvport; 1717 return --port; 1718 } 1719 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1720 { 1721 struct sockaddr_storage myaddr; 1722 int err, nloop = 0; 1723 int port = xs_get_srcport(transport); 1724 unsigned short last; 1725 1726 /* 1727 * If we are asking for any ephemeral port (i.e. port == 0 && 1728 * transport->xprt.resvport == 0), don't bind. Let the local 1729 * port selection happen implicitly when the socket is used 1730 * (for example at connect time). 1731 * 1732 * This ensures that we can continue to establish TCP 1733 * connections even when all local ephemeral ports are already 1734 * a part of some TCP connection. This makes no difference 1735 * for UDP sockets, but also doesn't harm them. 1736 * 1737 * If we're asking for any reserved port (i.e. port == 0 && 1738 * transport->xprt.resvport == 1) xs_get_srcport above will 1739 * ensure that port is non-zero and we will bind as needed. 1740 */ 1741 if (port <= 0) 1742 return port; 1743 1744 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1745 do { 1746 rpc_set_port((struct sockaddr *)&myaddr, port); 1747 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1748 transport->xprt.addrlen); 1749 if (err == 0) { 1750 if (transport->xprt.reuseport) 1751 transport->srcport = port; 1752 break; 1753 } 1754 last = port; 1755 port = xs_next_srcport(transport, port); 1756 if (port > last) 1757 nloop++; 1758 } while (err == -EADDRINUSE && nloop != 2); 1759 1760 if (myaddr.ss_family == AF_INET) 1761 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1762 &((struct sockaddr_in *)&myaddr)->sin_addr, 1763 port, err ? "failed" : "ok", err); 1764 else 1765 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1766 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1767 port, err ? "failed" : "ok", err); 1768 return err; 1769 } 1770 1771 /* 1772 * We don't support autobind on AF_LOCAL sockets 1773 */ 1774 static void xs_local_rpcbind(struct rpc_task *task) 1775 { 1776 xprt_set_bound(task->tk_xprt); 1777 } 1778 1779 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1780 { 1781 } 1782 1783 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1784 static struct lock_class_key xs_key[3]; 1785 static struct lock_class_key xs_slock_key[3]; 1786 1787 static inline void xs_reclassify_socketu(struct socket *sock) 1788 { 1789 struct sock *sk = sock->sk; 1790 1791 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1792 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]); 1793 } 1794 1795 static inline void xs_reclassify_socket4(struct socket *sock) 1796 { 1797 struct sock *sk = sock->sk; 1798 1799 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1800 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]); 1801 } 1802 1803 static inline void xs_reclassify_socket6(struct socket *sock) 1804 { 1805 struct sock *sk = sock->sk; 1806 1807 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1808 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]); 1809 } 1810 1811 static inline void xs_reclassify_socket(int family, struct socket *sock) 1812 { 1813 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1814 return; 1815 1816 switch (family) { 1817 case AF_LOCAL: 1818 xs_reclassify_socketu(sock); 1819 break; 1820 case AF_INET: 1821 xs_reclassify_socket4(sock); 1822 break; 1823 case AF_INET6: 1824 xs_reclassify_socket6(sock); 1825 break; 1826 } 1827 } 1828 #else 1829 static inline void xs_reclassify_socket(int family, struct socket *sock) 1830 { 1831 } 1832 #endif 1833 1834 static void xs_dummy_setup_socket(struct work_struct *work) 1835 { 1836 } 1837 1838 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1839 struct sock_xprt *transport, int family, int type, 1840 int protocol, bool reuseport) 1841 { 1842 struct file *filp; 1843 struct socket *sock; 1844 int err; 1845 1846 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1847 if (err < 0) { 1848 dprintk("RPC: can't create %d transport socket (%d).\n", 1849 protocol, -err); 1850 goto out; 1851 } 1852 xs_reclassify_socket(family, sock); 1853 1854 if (reuseport) 1855 sock_set_reuseport(sock->sk); 1856 1857 err = xs_bind(transport, sock); 1858 if (err) { 1859 sock_release(sock); 1860 goto out; 1861 } 1862 1863 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1864 if (IS_ERR(filp)) 1865 return ERR_CAST(filp); 1866 transport->file = filp; 1867 1868 return sock; 1869 out: 1870 return ERR_PTR(err); 1871 } 1872 1873 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1874 struct socket *sock) 1875 { 1876 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1877 xprt); 1878 1879 if (!transport->inet) { 1880 struct sock *sk = sock->sk; 1881 1882 lock_sock(sk); 1883 1884 xs_save_old_callbacks(transport, sk); 1885 1886 sk->sk_user_data = xprt; 1887 sk->sk_data_ready = xs_data_ready; 1888 sk->sk_write_space = xs_udp_write_space; 1889 sk->sk_state_change = xs_local_state_change; 1890 sk->sk_error_report = xs_error_report; 1891 1892 xprt_clear_connected(xprt); 1893 1894 /* Reset to new socket */ 1895 transport->sock = sock; 1896 transport->inet = sk; 1897 1898 release_sock(sk); 1899 } 1900 1901 xs_stream_start_connect(transport); 1902 1903 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1904 } 1905 1906 /** 1907 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1908 * @transport: socket transport to connect 1909 */ 1910 static int xs_local_setup_socket(struct sock_xprt *transport) 1911 { 1912 struct rpc_xprt *xprt = &transport->xprt; 1913 struct file *filp; 1914 struct socket *sock; 1915 int status; 1916 1917 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1918 SOCK_STREAM, 0, &sock, 1); 1919 if (status < 0) { 1920 dprintk("RPC: can't create AF_LOCAL " 1921 "transport socket (%d).\n", -status); 1922 goto out; 1923 } 1924 xs_reclassify_socket(AF_LOCAL, sock); 1925 1926 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1927 if (IS_ERR(filp)) { 1928 status = PTR_ERR(filp); 1929 goto out; 1930 } 1931 transport->file = filp; 1932 1933 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1934 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1935 1936 status = xs_local_finish_connecting(xprt, sock); 1937 trace_rpc_socket_connect(xprt, sock, status); 1938 switch (status) { 1939 case 0: 1940 dprintk("RPC: xprt %p connected to %s\n", 1941 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1942 xprt->stat.connect_count++; 1943 xprt->stat.connect_time += (long)jiffies - 1944 xprt->stat.connect_start; 1945 xprt_set_connected(xprt); 1946 break; 1947 case -ENOBUFS: 1948 break; 1949 case -ENOENT: 1950 dprintk("RPC: xprt %p: socket %s does not exist\n", 1951 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1952 break; 1953 case -ECONNREFUSED: 1954 dprintk("RPC: xprt %p: connection refused for %s\n", 1955 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1956 break; 1957 default: 1958 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1959 __func__, -status, 1960 xprt->address_strings[RPC_DISPLAY_ADDR]); 1961 } 1962 1963 out: 1964 xprt_clear_connecting(xprt); 1965 xprt_wake_pending_tasks(xprt, status); 1966 return status; 1967 } 1968 1969 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1970 { 1971 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1972 int ret; 1973 1974 if (transport->file) 1975 goto force_disconnect; 1976 1977 if (RPC_IS_ASYNC(task)) { 1978 /* 1979 * We want the AF_LOCAL connect to be resolved in the 1980 * filesystem namespace of the process making the rpc 1981 * call. Thus we connect synchronously. 1982 * 1983 * If we want to support asynchronous AF_LOCAL calls, 1984 * we'll need to figure out how to pass a namespace to 1985 * connect. 1986 */ 1987 task->tk_rpc_status = -ENOTCONN; 1988 rpc_exit(task, -ENOTCONN); 1989 goto out_wake; 1990 } 1991 ret = xs_local_setup_socket(transport); 1992 if (ret && !RPC_IS_SOFTCONN(task)) 1993 msleep_interruptible(15000); 1994 return; 1995 force_disconnect: 1996 xprt_force_disconnect(xprt); 1997 out_wake: 1998 xprt_clear_connecting(xprt); 1999 xprt_wake_pending_tasks(xprt, -ENOTCONN); 2000 } 2001 2002 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2003 /* 2004 * Note that this should be called with XPRT_LOCKED held, or recv_mutex 2005 * held, or when we otherwise know that we have exclusive access to the 2006 * socket, to guard against races with xs_reset_transport. 2007 */ 2008 static void xs_set_memalloc(struct rpc_xprt *xprt) 2009 { 2010 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2011 xprt); 2012 2013 /* 2014 * If there's no sock, then we have nothing to set. The 2015 * reconnecting process will get it for us. 2016 */ 2017 if (!transport->inet) 2018 return; 2019 if (atomic_read(&xprt->swapper)) 2020 sk_set_memalloc(transport->inet); 2021 } 2022 2023 /** 2024 * xs_enable_swap - Tag this transport as being used for swap. 2025 * @xprt: transport to tag 2026 * 2027 * Take a reference to this transport on behalf of the rpc_clnt, and 2028 * optionally mark it for swapping if it wasn't already. 2029 */ 2030 static int 2031 xs_enable_swap(struct rpc_xprt *xprt) 2032 { 2033 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2034 2035 mutex_lock(&xs->recv_mutex); 2036 if (atomic_inc_return(&xprt->swapper) == 1 && 2037 xs->inet) 2038 sk_set_memalloc(xs->inet); 2039 mutex_unlock(&xs->recv_mutex); 2040 return 0; 2041 } 2042 2043 /** 2044 * xs_disable_swap - Untag this transport as being used for swap. 2045 * @xprt: transport to tag 2046 * 2047 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2048 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2049 */ 2050 static void 2051 xs_disable_swap(struct rpc_xprt *xprt) 2052 { 2053 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2054 2055 mutex_lock(&xs->recv_mutex); 2056 if (atomic_dec_and_test(&xprt->swapper) && 2057 xs->inet) 2058 sk_clear_memalloc(xs->inet); 2059 mutex_unlock(&xs->recv_mutex); 2060 } 2061 #else 2062 static void xs_set_memalloc(struct rpc_xprt *xprt) 2063 { 2064 } 2065 2066 static int 2067 xs_enable_swap(struct rpc_xprt *xprt) 2068 { 2069 return -EINVAL; 2070 } 2071 2072 static void 2073 xs_disable_swap(struct rpc_xprt *xprt) 2074 { 2075 } 2076 #endif 2077 2078 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2079 { 2080 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2081 2082 if (!transport->inet) { 2083 struct sock *sk = sock->sk; 2084 2085 lock_sock(sk); 2086 2087 xs_save_old_callbacks(transport, sk); 2088 2089 sk->sk_user_data = xprt; 2090 sk->sk_data_ready = xs_data_ready; 2091 sk->sk_write_space = xs_udp_write_space; 2092 2093 xprt_set_connected(xprt); 2094 2095 /* Reset to new socket */ 2096 transport->sock = sock; 2097 transport->inet = sk; 2098 2099 xs_set_memalloc(xprt); 2100 2101 release_sock(sk); 2102 } 2103 xs_udp_do_set_buffer_size(xprt); 2104 2105 xprt->stat.connect_start = jiffies; 2106 } 2107 2108 static void xs_udp_setup_socket(struct work_struct *work) 2109 { 2110 struct sock_xprt *transport = 2111 container_of(work, struct sock_xprt, connect_worker.work); 2112 struct rpc_xprt *xprt = &transport->xprt; 2113 struct socket *sock; 2114 int status = -EIO; 2115 unsigned int pflags = current->flags; 2116 2117 if (atomic_read(&xprt->swapper)) 2118 current->flags |= PF_MEMALLOC; 2119 sock = xs_create_sock(xprt, transport, 2120 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2121 IPPROTO_UDP, false); 2122 if (IS_ERR(sock)) 2123 goto out; 2124 2125 dprintk("RPC: worker connecting xprt %p via %s to " 2126 "%s (port %s)\n", xprt, 2127 xprt->address_strings[RPC_DISPLAY_PROTO], 2128 xprt->address_strings[RPC_DISPLAY_ADDR], 2129 xprt->address_strings[RPC_DISPLAY_PORT]); 2130 2131 xs_udp_finish_connecting(xprt, sock); 2132 trace_rpc_socket_connect(xprt, sock, 0); 2133 status = 0; 2134 out: 2135 xprt_clear_connecting(xprt); 2136 xprt_unlock_connect(xprt, transport); 2137 xprt_wake_pending_tasks(xprt, status); 2138 current_restore_flags(pflags, PF_MEMALLOC); 2139 } 2140 2141 /** 2142 * xs_tcp_shutdown - gracefully shut down a TCP socket 2143 * @xprt: transport 2144 * 2145 * Initiates a graceful shutdown of the TCP socket by calling the 2146 * equivalent of shutdown(SHUT_RDWR); 2147 */ 2148 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2149 { 2150 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2151 struct socket *sock = transport->sock; 2152 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; 2153 2154 if (sock == NULL) 2155 return; 2156 if (!xprt->reuseport) { 2157 xs_close(xprt); 2158 return; 2159 } 2160 switch (skst) { 2161 case TCP_FIN_WAIT1: 2162 case TCP_FIN_WAIT2: 2163 break; 2164 case TCP_ESTABLISHED: 2165 case TCP_CLOSE_WAIT: 2166 kernel_sock_shutdown(sock, SHUT_RDWR); 2167 trace_rpc_socket_shutdown(xprt, sock); 2168 break; 2169 default: 2170 xs_reset_transport(transport); 2171 } 2172 } 2173 2174 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2175 struct socket *sock) 2176 { 2177 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2178 unsigned int keepidle; 2179 unsigned int keepcnt; 2180 unsigned int timeo; 2181 2182 spin_lock(&xprt->transport_lock); 2183 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2184 keepcnt = xprt->timeout->to_retries + 1; 2185 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2186 (xprt->timeout->to_retries + 1); 2187 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2188 spin_unlock(&xprt->transport_lock); 2189 2190 /* TCP Keepalive options */ 2191 sock_set_keepalive(sock->sk); 2192 tcp_sock_set_keepidle(sock->sk, keepidle); 2193 tcp_sock_set_keepintvl(sock->sk, keepidle); 2194 tcp_sock_set_keepcnt(sock->sk, keepcnt); 2195 2196 /* TCP user timeout (see RFC5482) */ 2197 tcp_sock_set_user_timeout(sock->sk, timeo); 2198 } 2199 2200 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2201 unsigned long connect_timeout, 2202 unsigned long reconnect_timeout) 2203 { 2204 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2205 struct rpc_timeout to; 2206 unsigned long initval; 2207 2208 spin_lock(&xprt->transport_lock); 2209 if (reconnect_timeout < xprt->max_reconnect_timeout) 2210 xprt->max_reconnect_timeout = reconnect_timeout; 2211 if (connect_timeout < xprt->connect_timeout) { 2212 memcpy(&to, xprt->timeout, sizeof(to)); 2213 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2214 /* Arbitrary lower limit */ 2215 if (initval < XS_TCP_INIT_REEST_TO << 1) 2216 initval = XS_TCP_INIT_REEST_TO << 1; 2217 to.to_initval = initval; 2218 to.to_maxval = initval; 2219 memcpy(&transport->tcp_timeout, &to, 2220 sizeof(transport->tcp_timeout)); 2221 xprt->timeout = &transport->tcp_timeout; 2222 xprt->connect_timeout = connect_timeout; 2223 } 2224 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2225 spin_unlock(&xprt->transport_lock); 2226 } 2227 2228 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2229 { 2230 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2231 2232 if (!transport->inet) { 2233 struct sock *sk = sock->sk; 2234 2235 /* Avoid temporary address, they are bad for long-lived 2236 * connections such as NFS mounts. 2237 * RFC4941, section 3.6 suggests that: 2238 * Individual applications, which have specific 2239 * knowledge about the normal duration of connections, 2240 * MAY override this as appropriate. 2241 */ 2242 if (xs_addr(xprt)->sa_family == PF_INET6) { 2243 ip6_sock_set_addr_preferences(sk, 2244 IPV6_PREFER_SRC_PUBLIC); 2245 } 2246 2247 xs_tcp_set_socket_timeouts(xprt, sock); 2248 tcp_sock_set_nodelay(sk); 2249 2250 lock_sock(sk); 2251 2252 xs_save_old_callbacks(transport, sk); 2253 2254 sk->sk_user_data = xprt; 2255 sk->sk_data_ready = xs_data_ready; 2256 sk->sk_state_change = xs_tcp_state_change; 2257 sk->sk_write_space = xs_tcp_write_space; 2258 sk->sk_error_report = xs_error_report; 2259 2260 /* socket options */ 2261 sock_reset_flag(sk, SOCK_LINGER); 2262 2263 xprt_clear_connected(xprt); 2264 2265 /* Reset to new socket */ 2266 transport->sock = sock; 2267 transport->inet = sk; 2268 2269 release_sock(sk); 2270 } 2271 2272 if (!xprt_bound(xprt)) 2273 return -ENOTCONN; 2274 2275 xs_set_memalloc(xprt); 2276 2277 xs_stream_start_connect(transport); 2278 2279 /* Tell the socket layer to start connecting... */ 2280 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2281 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2282 } 2283 2284 /** 2285 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2286 * @work: queued work item 2287 * 2288 * Invoked by a work queue tasklet. 2289 */ 2290 static void xs_tcp_setup_socket(struct work_struct *work) 2291 { 2292 struct sock_xprt *transport = 2293 container_of(work, struct sock_xprt, connect_worker.work); 2294 struct socket *sock = transport->sock; 2295 struct rpc_xprt *xprt = &transport->xprt; 2296 int status; 2297 unsigned int pflags = current->flags; 2298 2299 if (atomic_read(&xprt->swapper)) 2300 current->flags |= PF_MEMALLOC; 2301 2302 if (xprt_connected(xprt)) 2303 goto out; 2304 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT, 2305 &transport->sock_state) || 2306 !sock) { 2307 xs_reset_transport(transport); 2308 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family, 2309 SOCK_STREAM, IPPROTO_TCP, true); 2310 if (IS_ERR(sock)) { 2311 xprt_wake_pending_tasks(xprt, PTR_ERR(sock)); 2312 goto out; 2313 } 2314 } 2315 2316 dprintk("RPC: worker connecting xprt %p via %s to " 2317 "%s (port %s)\n", xprt, 2318 xprt->address_strings[RPC_DISPLAY_PROTO], 2319 xprt->address_strings[RPC_DISPLAY_ADDR], 2320 xprt->address_strings[RPC_DISPLAY_PORT]); 2321 2322 status = xs_tcp_finish_connecting(xprt, sock); 2323 trace_rpc_socket_connect(xprt, sock, status); 2324 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2325 xprt, -status, xprt_connected(xprt), 2326 sock->sk->sk_state); 2327 switch (status) { 2328 case 0: 2329 case -EINPROGRESS: 2330 /* SYN_SENT! */ 2331 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state); 2332 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2333 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2334 fallthrough; 2335 case -EALREADY: 2336 goto out_unlock; 2337 case -EADDRNOTAVAIL: 2338 /* Source port number is unavailable. Try a new one! */ 2339 transport->srcport = 0; 2340 status = -EAGAIN; 2341 break; 2342 case -EINVAL: 2343 /* Happens, for instance, if the user specified a link 2344 * local IPv6 address without a scope-id. 2345 */ 2346 case -ECONNREFUSED: 2347 case -ECONNRESET: 2348 case -ENETDOWN: 2349 case -ENETUNREACH: 2350 case -EHOSTUNREACH: 2351 case -EADDRINUSE: 2352 case -ENOBUFS: 2353 break; 2354 default: 2355 printk("%s: connect returned unhandled error %d\n", 2356 __func__, status); 2357 status = -EAGAIN; 2358 } 2359 2360 /* xs_tcp_force_close() wakes tasks with a fixed error code. 2361 * We need to wake them first to ensure the correct error code. 2362 */ 2363 xprt_wake_pending_tasks(xprt, status); 2364 xs_tcp_force_close(xprt); 2365 out: 2366 xprt_clear_connecting(xprt); 2367 out_unlock: 2368 xprt_unlock_connect(xprt, transport); 2369 current_restore_flags(pflags, PF_MEMALLOC); 2370 } 2371 2372 /** 2373 * xs_connect - connect a socket to a remote endpoint 2374 * @xprt: pointer to transport structure 2375 * @task: address of RPC task that manages state of connect request 2376 * 2377 * TCP: If the remote end dropped the connection, delay reconnecting. 2378 * 2379 * UDP socket connects are synchronous, but we use a work queue anyway 2380 * to guarantee that even unprivileged user processes can set up a 2381 * socket on a privileged port. 2382 * 2383 * If a UDP socket connect fails, the delay behavior here prevents 2384 * retry floods (hard mounts). 2385 */ 2386 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2387 { 2388 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2389 unsigned long delay = 0; 2390 2391 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2392 2393 if (transport->sock != NULL) { 2394 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2395 "seconds\n", xprt, xprt->reestablish_timeout / HZ); 2396 2397 delay = xprt_reconnect_delay(xprt); 2398 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); 2399 2400 } else 2401 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2402 2403 queue_delayed_work(xprtiod_workqueue, 2404 &transport->connect_worker, 2405 delay); 2406 } 2407 2408 static void xs_wake_disconnect(struct sock_xprt *transport) 2409 { 2410 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state)) 2411 xs_tcp_force_close(&transport->xprt); 2412 } 2413 2414 static void xs_wake_write(struct sock_xprt *transport) 2415 { 2416 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state)) 2417 xprt_write_space(&transport->xprt); 2418 } 2419 2420 static void xs_wake_error(struct sock_xprt *transport) 2421 { 2422 int sockerr; 2423 2424 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2425 return; 2426 mutex_lock(&transport->recv_mutex); 2427 if (transport->sock == NULL) 2428 goto out; 2429 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2430 goto out; 2431 sockerr = xchg(&transport->xprt_err, 0); 2432 if (sockerr < 0) 2433 xprt_wake_pending_tasks(&transport->xprt, sockerr); 2434 out: 2435 mutex_unlock(&transport->recv_mutex); 2436 } 2437 2438 static void xs_wake_pending(struct sock_xprt *transport) 2439 { 2440 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state)) 2441 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN); 2442 } 2443 2444 static void xs_error_handle(struct work_struct *work) 2445 { 2446 struct sock_xprt *transport = container_of(work, 2447 struct sock_xprt, error_worker); 2448 2449 xs_wake_disconnect(transport); 2450 xs_wake_write(transport); 2451 xs_wake_error(transport); 2452 xs_wake_pending(transport); 2453 } 2454 2455 /** 2456 * xs_local_print_stats - display AF_LOCAL socket-specific stats 2457 * @xprt: rpc_xprt struct containing statistics 2458 * @seq: output file 2459 * 2460 */ 2461 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2462 { 2463 long idle_time = 0; 2464 2465 if (xprt_connected(xprt)) 2466 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2467 2468 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2469 "%llu %llu %lu %llu %llu\n", 2470 xprt->stat.bind_count, 2471 xprt->stat.connect_count, 2472 xprt->stat.connect_time / HZ, 2473 idle_time, 2474 xprt->stat.sends, 2475 xprt->stat.recvs, 2476 xprt->stat.bad_xids, 2477 xprt->stat.req_u, 2478 xprt->stat.bklog_u, 2479 xprt->stat.max_slots, 2480 xprt->stat.sending_u, 2481 xprt->stat.pending_u); 2482 } 2483 2484 /** 2485 * xs_udp_print_stats - display UDP socket-specific stats 2486 * @xprt: rpc_xprt struct containing statistics 2487 * @seq: output file 2488 * 2489 */ 2490 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2491 { 2492 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2493 2494 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2495 "%lu %llu %llu\n", 2496 transport->srcport, 2497 xprt->stat.bind_count, 2498 xprt->stat.sends, 2499 xprt->stat.recvs, 2500 xprt->stat.bad_xids, 2501 xprt->stat.req_u, 2502 xprt->stat.bklog_u, 2503 xprt->stat.max_slots, 2504 xprt->stat.sending_u, 2505 xprt->stat.pending_u); 2506 } 2507 2508 /** 2509 * xs_tcp_print_stats - display TCP socket-specific stats 2510 * @xprt: rpc_xprt struct containing statistics 2511 * @seq: output file 2512 * 2513 */ 2514 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2515 { 2516 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2517 long idle_time = 0; 2518 2519 if (xprt_connected(xprt)) 2520 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2521 2522 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2523 "%llu %llu %lu %llu %llu\n", 2524 transport->srcport, 2525 xprt->stat.bind_count, 2526 xprt->stat.connect_count, 2527 xprt->stat.connect_time / HZ, 2528 idle_time, 2529 xprt->stat.sends, 2530 xprt->stat.recvs, 2531 xprt->stat.bad_xids, 2532 xprt->stat.req_u, 2533 xprt->stat.bklog_u, 2534 xprt->stat.max_slots, 2535 xprt->stat.sending_u, 2536 xprt->stat.pending_u); 2537 } 2538 2539 /* 2540 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2541 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2542 * to use the server side send routines. 2543 */ 2544 static int bc_malloc(struct rpc_task *task) 2545 { 2546 struct rpc_rqst *rqst = task->tk_rqstp; 2547 size_t size = rqst->rq_callsize; 2548 struct page *page; 2549 struct rpc_buffer *buf; 2550 2551 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2552 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2553 size); 2554 return -EINVAL; 2555 } 2556 2557 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); 2558 if (!page) 2559 return -ENOMEM; 2560 2561 buf = page_address(page); 2562 buf->len = PAGE_SIZE; 2563 2564 rqst->rq_buffer = buf->data; 2565 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2566 return 0; 2567 } 2568 2569 /* 2570 * Free the space allocated in the bc_alloc routine 2571 */ 2572 static void bc_free(struct rpc_task *task) 2573 { 2574 void *buffer = task->tk_rqstp->rq_buffer; 2575 struct rpc_buffer *buf; 2576 2577 buf = container_of(buffer, struct rpc_buffer, data); 2578 free_page((unsigned long)buf); 2579 } 2580 2581 static int bc_sendto(struct rpc_rqst *req) 2582 { 2583 struct xdr_buf *xdr = &req->rq_snd_buf; 2584 struct sock_xprt *transport = 2585 container_of(req->rq_xprt, struct sock_xprt, xprt); 2586 struct msghdr msg = { 2587 .msg_flags = 0, 2588 }; 2589 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | 2590 (u32)xdr->len); 2591 unsigned int sent = 0; 2592 int err; 2593 2594 req->rq_xtime = ktime_get(); 2595 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask()); 2596 if (err < 0) 2597 return err; 2598 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent); 2599 xdr_free_bvec(xdr); 2600 if (err < 0 || sent != (xdr->len + sizeof(marker))) 2601 return -EAGAIN; 2602 return sent; 2603 } 2604 2605 /** 2606 * bc_send_request - Send a backchannel Call on a TCP socket 2607 * @req: rpc_rqst containing Call message to be sent 2608 * 2609 * xpt_mutex ensures @rqstp's whole message is written to the socket 2610 * without interruption. 2611 * 2612 * Return values: 2613 * %0 if the message was sent successfully 2614 * %ENOTCONN if the message was not sent 2615 */ 2616 static int bc_send_request(struct rpc_rqst *req) 2617 { 2618 struct svc_xprt *xprt; 2619 int len; 2620 2621 /* 2622 * Get the server socket associated with this callback xprt 2623 */ 2624 xprt = req->rq_xprt->bc_xprt; 2625 2626 /* 2627 * Grab the mutex to serialize data as the connection is shared 2628 * with the fore channel 2629 */ 2630 mutex_lock(&xprt->xpt_mutex); 2631 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2632 len = -ENOTCONN; 2633 else 2634 len = bc_sendto(req); 2635 mutex_unlock(&xprt->xpt_mutex); 2636 2637 if (len > 0) 2638 len = 0; 2639 2640 return len; 2641 } 2642 2643 /* 2644 * The close routine. Since this is client initiated, we do nothing 2645 */ 2646 2647 static void bc_close(struct rpc_xprt *xprt) 2648 { 2649 xprt_disconnect_done(xprt); 2650 } 2651 2652 /* 2653 * The xprt destroy routine. Again, because this connection is client 2654 * initiated, we do nothing 2655 */ 2656 2657 static void bc_destroy(struct rpc_xprt *xprt) 2658 { 2659 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2660 2661 xs_xprt_free(xprt); 2662 module_put(THIS_MODULE); 2663 } 2664 2665 static const struct rpc_xprt_ops xs_local_ops = { 2666 .reserve_xprt = xprt_reserve_xprt, 2667 .release_xprt = xprt_release_xprt, 2668 .alloc_slot = xprt_alloc_slot, 2669 .free_slot = xprt_free_slot, 2670 .rpcbind = xs_local_rpcbind, 2671 .set_port = xs_local_set_port, 2672 .connect = xs_local_connect, 2673 .buf_alloc = rpc_malloc, 2674 .buf_free = rpc_free, 2675 .prepare_request = xs_stream_prepare_request, 2676 .send_request = xs_local_send_request, 2677 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2678 .close = xs_close, 2679 .destroy = xs_destroy, 2680 .print_stats = xs_local_print_stats, 2681 .enable_swap = xs_enable_swap, 2682 .disable_swap = xs_disable_swap, 2683 }; 2684 2685 static const struct rpc_xprt_ops xs_udp_ops = { 2686 .set_buffer_size = xs_udp_set_buffer_size, 2687 .reserve_xprt = xprt_reserve_xprt_cong, 2688 .release_xprt = xprt_release_xprt_cong, 2689 .alloc_slot = xprt_alloc_slot, 2690 .free_slot = xprt_free_slot, 2691 .rpcbind = rpcb_getport_async, 2692 .set_port = xs_set_port, 2693 .connect = xs_connect, 2694 .get_srcaddr = xs_sock_srcaddr, 2695 .get_srcport = xs_sock_srcport, 2696 .buf_alloc = rpc_malloc, 2697 .buf_free = rpc_free, 2698 .send_request = xs_udp_send_request, 2699 .wait_for_reply_request = xprt_wait_for_reply_request_rtt, 2700 .timer = xs_udp_timer, 2701 .release_request = xprt_release_rqst_cong, 2702 .close = xs_close, 2703 .destroy = xs_destroy, 2704 .print_stats = xs_udp_print_stats, 2705 .enable_swap = xs_enable_swap, 2706 .disable_swap = xs_disable_swap, 2707 .inject_disconnect = xs_inject_disconnect, 2708 }; 2709 2710 static const struct rpc_xprt_ops xs_tcp_ops = { 2711 .reserve_xprt = xprt_reserve_xprt, 2712 .release_xprt = xprt_release_xprt, 2713 .alloc_slot = xprt_alloc_slot, 2714 .free_slot = xprt_free_slot, 2715 .rpcbind = rpcb_getport_async, 2716 .set_port = xs_set_port, 2717 .connect = xs_connect, 2718 .get_srcaddr = xs_sock_srcaddr, 2719 .get_srcport = xs_sock_srcport, 2720 .buf_alloc = rpc_malloc, 2721 .buf_free = rpc_free, 2722 .prepare_request = xs_stream_prepare_request, 2723 .send_request = xs_tcp_send_request, 2724 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2725 .close = xs_tcp_shutdown, 2726 .destroy = xs_destroy, 2727 .set_connect_timeout = xs_tcp_set_connect_timeout, 2728 .print_stats = xs_tcp_print_stats, 2729 .enable_swap = xs_enable_swap, 2730 .disable_swap = xs_disable_swap, 2731 .inject_disconnect = xs_inject_disconnect, 2732 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2733 .bc_setup = xprt_setup_bc, 2734 .bc_maxpayload = xs_tcp_bc_maxpayload, 2735 .bc_num_slots = xprt_bc_max_slots, 2736 .bc_free_rqst = xprt_free_bc_rqst, 2737 .bc_destroy = xprt_destroy_bc, 2738 #endif 2739 }; 2740 2741 /* 2742 * The rpc_xprt_ops for the server backchannel 2743 */ 2744 2745 static const struct rpc_xprt_ops bc_tcp_ops = { 2746 .reserve_xprt = xprt_reserve_xprt, 2747 .release_xprt = xprt_release_xprt, 2748 .alloc_slot = xprt_alloc_slot, 2749 .free_slot = xprt_free_slot, 2750 .buf_alloc = bc_malloc, 2751 .buf_free = bc_free, 2752 .send_request = bc_send_request, 2753 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2754 .close = bc_close, 2755 .destroy = bc_destroy, 2756 .print_stats = xs_tcp_print_stats, 2757 .enable_swap = xs_enable_swap, 2758 .disable_swap = xs_disable_swap, 2759 .inject_disconnect = xs_inject_disconnect, 2760 }; 2761 2762 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2763 { 2764 static const struct sockaddr_in sin = { 2765 .sin_family = AF_INET, 2766 .sin_addr.s_addr = htonl(INADDR_ANY), 2767 }; 2768 static const struct sockaddr_in6 sin6 = { 2769 .sin6_family = AF_INET6, 2770 .sin6_addr = IN6ADDR_ANY_INIT, 2771 }; 2772 2773 switch (family) { 2774 case AF_LOCAL: 2775 break; 2776 case AF_INET: 2777 memcpy(sap, &sin, sizeof(sin)); 2778 break; 2779 case AF_INET6: 2780 memcpy(sap, &sin6, sizeof(sin6)); 2781 break; 2782 default: 2783 dprintk("RPC: %s: Bad address family\n", __func__); 2784 return -EAFNOSUPPORT; 2785 } 2786 return 0; 2787 } 2788 2789 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2790 unsigned int slot_table_size, 2791 unsigned int max_slot_table_size) 2792 { 2793 struct rpc_xprt *xprt; 2794 struct sock_xprt *new; 2795 2796 if (args->addrlen > sizeof(xprt->addr)) { 2797 dprintk("RPC: xs_setup_xprt: address too large\n"); 2798 return ERR_PTR(-EBADF); 2799 } 2800 2801 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2802 max_slot_table_size); 2803 if (xprt == NULL) { 2804 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2805 "rpc_xprt\n"); 2806 return ERR_PTR(-ENOMEM); 2807 } 2808 2809 new = container_of(xprt, struct sock_xprt, xprt); 2810 mutex_init(&new->recv_mutex); 2811 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2812 xprt->addrlen = args->addrlen; 2813 if (args->srcaddr) 2814 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2815 else { 2816 int err; 2817 err = xs_init_anyaddr(args->dstaddr->sa_family, 2818 (struct sockaddr *)&new->srcaddr); 2819 if (err != 0) { 2820 xprt_free(xprt); 2821 return ERR_PTR(err); 2822 } 2823 } 2824 2825 return xprt; 2826 } 2827 2828 static const struct rpc_timeout xs_local_default_timeout = { 2829 .to_initval = 10 * HZ, 2830 .to_maxval = 10 * HZ, 2831 .to_retries = 2, 2832 }; 2833 2834 /** 2835 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2836 * @args: rpc transport creation arguments 2837 * 2838 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2839 */ 2840 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2841 { 2842 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2843 struct sock_xprt *transport; 2844 struct rpc_xprt *xprt; 2845 struct rpc_xprt *ret; 2846 2847 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2848 xprt_max_tcp_slot_table_entries); 2849 if (IS_ERR(xprt)) 2850 return xprt; 2851 transport = container_of(xprt, struct sock_xprt, xprt); 2852 2853 xprt->prot = 0; 2854 xprt->xprt_class = &xs_local_transport; 2855 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2856 2857 xprt->bind_timeout = XS_BIND_TO; 2858 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2859 xprt->idle_timeout = XS_IDLE_DISC_TO; 2860 2861 xprt->ops = &xs_local_ops; 2862 xprt->timeout = &xs_local_default_timeout; 2863 2864 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2865 INIT_WORK(&transport->error_worker, xs_error_handle); 2866 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); 2867 2868 switch (sun->sun_family) { 2869 case AF_LOCAL: 2870 if (sun->sun_path[0] != '/') { 2871 dprintk("RPC: bad AF_LOCAL address: %s\n", 2872 sun->sun_path); 2873 ret = ERR_PTR(-EINVAL); 2874 goto out_err; 2875 } 2876 xprt_set_bound(xprt); 2877 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2878 break; 2879 default: 2880 ret = ERR_PTR(-EAFNOSUPPORT); 2881 goto out_err; 2882 } 2883 2884 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2885 xprt->address_strings[RPC_DISPLAY_ADDR]); 2886 2887 if (try_module_get(THIS_MODULE)) 2888 return xprt; 2889 ret = ERR_PTR(-EINVAL); 2890 out_err: 2891 xs_xprt_free(xprt); 2892 return ret; 2893 } 2894 2895 static const struct rpc_timeout xs_udp_default_timeout = { 2896 .to_initval = 5 * HZ, 2897 .to_maxval = 30 * HZ, 2898 .to_increment = 5 * HZ, 2899 .to_retries = 5, 2900 }; 2901 2902 /** 2903 * xs_setup_udp - Set up transport to use a UDP socket 2904 * @args: rpc transport creation arguments 2905 * 2906 */ 2907 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2908 { 2909 struct sockaddr *addr = args->dstaddr; 2910 struct rpc_xprt *xprt; 2911 struct sock_xprt *transport; 2912 struct rpc_xprt *ret; 2913 2914 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2915 xprt_udp_slot_table_entries); 2916 if (IS_ERR(xprt)) 2917 return xprt; 2918 transport = container_of(xprt, struct sock_xprt, xprt); 2919 2920 xprt->prot = IPPROTO_UDP; 2921 xprt->xprt_class = &xs_udp_transport; 2922 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2923 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2924 2925 xprt->bind_timeout = XS_BIND_TO; 2926 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2927 xprt->idle_timeout = XS_IDLE_DISC_TO; 2928 2929 xprt->ops = &xs_udp_ops; 2930 2931 xprt->timeout = &xs_udp_default_timeout; 2932 2933 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2934 INIT_WORK(&transport->error_worker, xs_error_handle); 2935 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2936 2937 switch (addr->sa_family) { 2938 case AF_INET: 2939 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2940 xprt_set_bound(xprt); 2941 2942 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2943 break; 2944 case AF_INET6: 2945 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2946 xprt_set_bound(xprt); 2947 2948 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2949 break; 2950 default: 2951 ret = ERR_PTR(-EAFNOSUPPORT); 2952 goto out_err; 2953 } 2954 2955 if (xprt_bound(xprt)) 2956 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2957 xprt->address_strings[RPC_DISPLAY_ADDR], 2958 xprt->address_strings[RPC_DISPLAY_PORT], 2959 xprt->address_strings[RPC_DISPLAY_PROTO]); 2960 else 2961 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2962 xprt->address_strings[RPC_DISPLAY_ADDR], 2963 xprt->address_strings[RPC_DISPLAY_PROTO]); 2964 2965 if (try_module_get(THIS_MODULE)) 2966 return xprt; 2967 ret = ERR_PTR(-EINVAL); 2968 out_err: 2969 xs_xprt_free(xprt); 2970 return ret; 2971 } 2972 2973 static const struct rpc_timeout xs_tcp_default_timeout = { 2974 .to_initval = 60 * HZ, 2975 .to_maxval = 60 * HZ, 2976 .to_retries = 2, 2977 }; 2978 2979 /** 2980 * xs_setup_tcp - Set up transport to use a TCP socket 2981 * @args: rpc transport creation arguments 2982 * 2983 */ 2984 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2985 { 2986 struct sockaddr *addr = args->dstaddr; 2987 struct rpc_xprt *xprt; 2988 struct sock_xprt *transport; 2989 struct rpc_xprt *ret; 2990 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2991 2992 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2993 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2994 2995 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2996 max_slot_table_size); 2997 if (IS_ERR(xprt)) 2998 return xprt; 2999 transport = container_of(xprt, struct sock_xprt, xprt); 3000 3001 xprt->prot = IPPROTO_TCP; 3002 xprt->xprt_class = &xs_tcp_transport; 3003 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3004 3005 xprt->bind_timeout = XS_BIND_TO; 3006 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3007 xprt->idle_timeout = XS_IDLE_DISC_TO; 3008 3009 xprt->ops = &xs_tcp_ops; 3010 xprt->timeout = &xs_tcp_default_timeout; 3011 3012 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3013 xprt->connect_timeout = xprt->timeout->to_initval * 3014 (xprt->timeout->to_retries + 1); 3015 3016 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 3017 INIT_WORK(&transport->error_worker, xs_error_handle); 3018 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3019 3020 switch (addr->sa_family) { 3021 case AF_INET: 3022 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3023 xprt_set_bound(xprt); 3024 3025 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3026 break; 3027 case AF_INET6: 3028 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3029 xprt_set_bound(xprt); 3030 3031 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3032 break; 3033 default: 3034 ret = ERR_PTR(-EAFNOSUPPORT); 3035 goto out_err; 3036 } 3037 3038 if (xprt_bound(xprt)) 3039 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3040 xprt->address_strings[RPC_DISPLAY_ADDR], 3041 xprt->address_strings[RPC_DISPLAY_PORT], 3042 xprt->address_strings[RPC_DISPLAY_PROTO]); 3043 else 3044 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3045 xprt->address_strings[RPC_DISPLAY_ADDR], 3046 xprt->address_strings[RPC_DISPLAY_PROTO]); 3047 3048 if (try_module_get(THIS_MODULE)) 3049 return xprt; 3050 ret = ERR_PTR(-EINVAL); 3051 out_err: 3052 xs_xprt_free(xprt); 3053 return ret; 3054 } 3055 3056 /** 3057 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3058 * @args: rpc transport creation arguments 3059 * 3060 */ 3061 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3062 { 3063 struct sockaddr *addr = args->dstaddr; 3064 struct rpc_xprt *xprt; 3065 struct sock_xprt *transport; 3066 struct svc_sock *bc_sock; 3067 struct rpc_xprt *ret; 3068 3069 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3070 xprt_tcp_slot_table_entries); 3071 if (IS_ERR(xprt)) 3072 return xprt; 3073 transport = container_of(xprt, struct sock_xprt, xprt); 3074 3075 xprt->prot = IPPROTO_TCP; 3076 xprt->xprt_class = &xs_bc_tcp_transport; 3077 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3078 xprt->timeout = &xs_tcp_default_timeout; 3079 3080 /* backchannel */ 3081 xprt_set_bound(xprt); 3082 xprt->bind_timeout = 0; 3083 xprt->reestablish_timeout = 0; 3084 xprt->idle_timeout = 0; 3085 3086 xprt->ops = &bc_tcp_ops; 3087 3088 switch (addr->sa_family) { 3089 case AF_INET: 3090 xs_format_peer_addresses(xprt, "tcp", 3091 RPCBIND_NETID_TCP); 3092 break; 3093 case AF_INET6: 3094 xs_format_peer_addresses(xprt, "tcp", 3095 RPCBIND_NETID_TCP6); 3096 break; 3097 default: 3098 ret = ERR_PTR(-EAFNOSUPPORT); 3099 goto out_err; 3100 } 3101 3102 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3103 xprt->address_strings[RPC_DISPLAY_ADDR], 3104 xprt->address_strings[RPC_DISPLAY_PORT], 3105 xprt->address_strings[RPC_DISPLAY_PROTO]); 3106 3107 /* 3108 * Once we've associated a backchannel xprt with a connection, 3109 * we want to keep it around as long as the connection lasts, 3110 * in case we need to start using it for a backchannel again; 3111 * this reference won't be dropped until bc_xprt is destroyed. 3112 */ 3113 xprt_get(xprt); 3114 args->bc_xprt->xpt_bc_xprt = xprt; 3115 xprt->bc_xprt = args->bc_xprt; 3116 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3117 transport->sock = bc_sock->sk_sock; 3118 transport->inet = bc_sock->sk_sk; 3119 3120 /* 3121 * Since we don't want connections for the backchannel, we set 3122 * the xprt status to connected 3123 */ 3124 xprt_set_connected(xprt); 3125 3126 if (try_module_get(THIS_MODULE)) 3127 return xprt; 3128 3129 args->bc_xprt->xpt_bc_xprt = NULL; 3130 args->bc_xprt->xpt_bc_xps = NULL; 3131 xprt_put(xprt); 3132 ret = ERR_PTR(-EINVAL); 3133 out_err: 3134 xs_xprt_free(xprt); 3135 return ret; 3136 } 3137 3138 static struct xprt_class xs_local_transport = { 3139 .list = LIST_HEAD_INIT(xs_local_transport.list), 3140 .name = "named UNIX socket", 3141 .owner = THIS_MODULE, 3142 .ident = XPRT_TRANSPORT_LOCAL, 3143 .setup = xs_setup_local, 3144 .netid = { "" }, 3145 }; 3146 3147 static struct xprt_class xs_udp_transport = { 3148 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3149 .name = "udp", 3150 .owner = THIS_MODULE, 3151 .ident = XPRT_TRANSPORT_UDP, 3152 .setup = xs_setup_udp, 3153 .netid = { "udp", "udp6", "" }, 3154 }; 3155 3156 static struct xprt_class xs_tcp_transport = { 3157 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3158 .name = "tcp", 3159 .owner = THIS_MODULE, 3160 .ident = XPRT_TRANSPORT_TCP, 3161 .setup = xs_setup_tcp, 3162 .netid = { "tcp", "tcp6", "" }, 3163 }; 3164 3165 static struct xprt_class xs_bc_tcp_transport = { 3166 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3167 .name = "tcp NFSv4.1 backchannel", 3168 .owner = THIS_MODULE, 3169 .ident = XPRT_TRANSPORT_BC_TCP, 3170 .setup = xs_setup_bc_tcp, 3171 .netid = { "" }, 3172 }; 3173 3174 /** 3175 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3176 * 3177 */ 3178 int init_socket_xprt(void) 3179 { 3180 if (!sunrpc_table_header) 3181 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3182 3183 xprt_register_transport(&xs_local_transport); 3184 xprt_register_transport(&xs_udp_transport); 3185 xprt_register_transport(&xs_tcp_transport); 3186 xprt_register_transport(&xs_bc_tcp_transport); 3187 3188 return 0; 3189 } 3190 3191 /** 3192 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3193 * 3194 */ 3195 void cleanup_socket_xprt(void) 3196 { 3197 if (sunrpc_table_header) { 3198 unregister_sysctl_table(sunrpc_table_header); 3199 sunrpc_table_header = NULL; 3200 } 3201 3202 xprt_unregister_transport(&xs_local_transport); 3203 xprt_unregister_transport(&xs_udp_transport); 3204 xprt_unregister_transport(&xs_tcp_transport); 3205 xprt_unregister_transport(&xs_bc_tcp_transport); 3206 } 3207 3208 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3209 { 3210 return param_set_uint_minmax(val, kp, 3211 RPC_MIN_RESVPORT, 3212 RPC_MAX_RESVPORT); 3213 } 3214 3215 static const struct kernel_param_ops param_ops_portnr = { 3216 .set = param_set_portnr, 3217 .get = param_get_uint, 3218 }; 3219 3220 #define param_check_portnr(name, p) \ 3221 __param_check(name, p, unsigned int); 3222 3223 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3224 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3225 3226 static int param_set_slot_table_size(const char *val, 3227 const struct kernel_param *kp) 3228 { 3229 return param_set_uint_minmax(val, kp, 3230 RPC_MIN_SLOT_TABLE, 3231 RPC_MAX_SLOT_TABLE); 3232 } 3233 3234 static const struct kernel_param_ops param_ops_slot_table_size = { 3235 .set = param_set_slot_table_size, 3236 .get = param_get_uint, 3237 }; 3238 3239 #define param_check_slot_table_size(name, p) \ 3240 __param_check(name, p, unsigned int); 3241 3242 static int param_set_max_slot_table_size(const char *val, 3243 const struct kernel_param *kp) 3244 { 3245 return param_set_uint_minmax(val, kp, 3246 RPC_MIN_SLOT_TABLE, 3247 RPC_MAX_SLOT_TABLE_LIMIT); 3248 } 3249 3250 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3251 .set = param_set_max_slot_table_size, 3252 .get = param_get_uint, 3253 }; 3254 3255 #define param_check_max_slot_table_size(name, p) \ 3256 __param_check(name, p, unsigned int); 3257 3258 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3259 slot_table_size, 0644); 3260 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3261 max_slot_table_size, 0644); 3262 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3263 slot_table_size, 0644); 3264