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/sock.h> 56 #include <trace/events/sunrpc.h> 57 58 #include "socklib.h" 59 #include "sunrpc.h" 60 61 static void xs_close(struct rpc_xprt *xprt); 62 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock); 63 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 64 struct socket *sock); 65 66 /* 67 * xprtsock tunables 68 */ 69 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 70 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE; 71 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE; 72 73 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 74 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 75 76 #define XS_TCP_LINGER_TO (15U * HZ) 77 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO; 78 79 /* 80 * We can register our own files under /proc/sys/sunrpc by 81 * calling register_sysctl_table() again. The files in that 82 * directory become the union of all files registered there. 83 * 84 * We simply need to make sure that we don't collide with 85 * someone else's file names! 86 */ 87 88 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; 89 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; 90 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT; 91 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; 92 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; 93 94 static struct ctl_table_header *sunrpc_table_header; 95 96 static struct xprt_class xs_local_transport; 97 static struct xprt_class xs_udp_transport; 98 static struct xprt_class xs_tcp_transport; 99 static struct xprt_class xs_bc_tcp_transport; 100 101 /* 102 * FIXME: changing the UDP slot table size should also resize the UDP 103 * socket buffers for existing UDP transports 104 */ 105 static struct ctl_table xs_tunables_table[] = { 106 { 107 .procname = "udp_slot_table_entries", 108 .data = &xprt_udp_slot_table_entries, 109 .maxlen = sizeof(unsigned int), 110 .mode = 0644, 111 .proc_handler = proc_dointvec_minmax, 112 .extra1 = &min_slot_table_size, 113 .extra2 = &max_slot_table_size 114 }, 115 { 116 .procname = "tcp_slot_table_entries", 117 .data = &xprt_tcp_slot_table_entries, 118 .maxlen = sizeof(unsigned int), 119 .mode = 0644, 120 .proc_handler = proc_dointvec_minmax, 121 .extra1 = &min_slot_table_size, 122 .extra2 = &max_slot_table_size 123 }, 124 { 125 .procname = "tcp_max_slot_table_entries", 126 .data = &xprt_max_tcp_slot_table_entries, 127 .maxlen = sizeof(unsigned int), 128 .mode = 0644, 129 .proc_handler = proc_dointvec_minmax, 130 .extra1 = &min_slot_table_size, 131 .extra2 = &max_tcp_slot_table_limit 132 }, 133 { 134 .procname = "min_resvport", 135 .data = &xprt_min_resvport, 136 .maxlen = sizeof(unsigned int), 137 .mode = 0644, 138 .proc_handler = proc_dointvec_minmax, 139 .extra1 = &xprt_min_resvport_limit, 140 .extra2 = &xprt_max_resvport_limit 141 }, 142 { 143 .procname = "max_resvport", 144 .data = &xprt_max_resvport, 145 .maxlen = sizeof(unsigned int), 146 .mode = 0644, 147 .proc_handler = proc_dointvec_minmax, 148 .extra1 = &xprt_min_resvport_limit, 149 .extra2 = &xprt_max_resvport_limit 150 }, 151 { 152 .procname = "tcp_fin_timeout", 153 .data = &xs_tcp_fin_timeout, 154 .maxlen = sizeof(xs_tcp_fin_timeout), 155 .mode = 0644, 156 .proc_handler = proc_dointvec_jiffies, 157 }, 158 { }, 159 }; 160 161 static struct ctl_table sunrpc_table[] = { 162 { 163 .procname = "sunrpc", 164 .mode = 0555, 165 .child = xs_tunables_table 166 }, 167 { }, 168 }; 169 170 /* 171 * Wait duration for a reply from the RPC portmapper. 172 */ 173 #define XS_BIND_TO (60U * HZ) 174 175 /* 176 * Delay if a UDP socket connect error occurs. This is most likely some 177 * kind of resource problem on the local host. 178 */ 179 #define XS_UDP_REEST_TO (2U * HZ) 180 181 /* 182 * The reestablish timeout allows clients to delay for a bit before attempting 183 * to reconnect to a server that just dropped our connection. 184 * 185 * We implement an exponential backoff when trying to reestablish a TCP 186 * transport connection with the server. Some servers like to drop a TCP 187 * connection when they are overworked, so we start with a short timeout and 188 * increase over time if the server is down or not responding. 189 */ 190 #define XS_TCP_INIT_REEST_TO (3U * HZ) 191 192 /* 193 * TCP idle timeout; client drops the transport socket if it is idle 194 * for this long. Note that we also timeout UDP sockets to prevent 195 * holding port numbers when there is no RPC traffic. 196 */ 197 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 198 199 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 200 # undef RPC_DEBUG_DATA 201 # define RPCDBG_FACILITY RPCDBG_TRANS 202 #endif 203 204 #ifdef RPC_DEBUG_DATA 205 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 206 { 207 u8 *buf = (u8 *) packet; 208 int j; 209 210 dprintk("RPC: %s\n", msg); 211 for (j = 0; j < count && j < 128; j += 4) { 212 if (!(j & 31)) { 213 if (j) 214 dprintk("\n"); 215 dprintk("0x%04x ", j); 216 } 217 dprintk("%02x%02x%02x%02x ", 218 buf[j], buf[j+1], buf[j+2], buf[j+3]); 219 } 220 dprintk("\n"); 221 } 222 #else 223 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 224 { 225 /* NOP */ 226 } 227 #endif 228 229 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 230 { 231 return (struct rpc_xprt *) sk->sk_user_data; 232 } 233 234 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) 235 { 236 return (struct sockaddr *) &xprt->addr; 237 } 238 239 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt) 240 { 241 return (struct sockaddr_un *) &xprt->addr; 242 } 243 244 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) 245 { 246 return (struct sockaddr_in *) &xprt->addr; 247 } 248 249 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) 250 { 251 return (struct sockaddr_in6 *) &xprt->addr; 252 } 253 254 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt) 255 { 256 struct sockaddr *sap = xs_addr(xprt); 257 struct sockaddr_in6 *sin6; 258 struct sockaddr_in *sin; 259 struct sockaddr_un *sun; 260 char buf[128]; 261 262 switch (sap->sa_family) { 263 case AF_LOCAL: 264 sun = xs_addr_un(xprt); 265 strscpy(buf, sun->sun_path, sizeof(buf)); 266 xprt->address_strings[RPC_DISPLAY_ADDR] = 267 kstrdup(buf, GFP_KERNEL); 268 break; 269 case AF_INET: 270 (void)rpc_ntop(sap, buf, sizeof(buf)); 271 xprt->address_strings[RPC_DISPLAY_ADDR] = 272 kstrdup(buf, GFP_KERNEL); 273 sin = xs_addr_in(xprt); 274 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 275 break; 276 case AF_INET6: 277 (void)rpc_ntop(sap, buf, sizeof(buf)); 278 xprt->address_strings[RPC_DISPLAY_ADDR] = 279 kstrdup(buf, GFP_KERNEL); 280 sin6 = xs_addr_in6(xprt); 281 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 282 break; 283 default: 284 BUG(); 285 } 286 287 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 288 } 289 290 static void xs_format_common_peer_ports(struct rpc_xprt *xprt) 291 { 292 struct sockaddr *sap = xs_addr(xprt); 293 char buf[128]; 294 295 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 296 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 297 298 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 299 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 300 } 301 302 static void xs_format_peer_addresses(struct rpc_xprt *xprt, 303 const char *protocol, 304 const char *netid) 305 { 306 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol; 307 xprt->address_strings[RPC_DISPLAY_NETID] = netid; 308 xs_format_common_peer_addresses(xprt); 309 xs_format_common_peer_ports(xprt); 310 } 311 312 static void xs_update_peer_port(struct rpc_xprt *xprt) 313 { 314 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 315 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 316 317 xs_format_common_peer_ports(xprt); 318 } 319 320 static void xs_free_peer_addresses(struct rpc_xprt *xprt) 321 { 322 unsigned int i; 323 324 for (i = 0; i < RPC_DISPLAY_MAX; i++) 325 switch (i) { 326 case RPC_DISPLAY_PROTO: 327 case RPC_DISPLAY_NETID: 328 continue; 329 default: 330 kfree(xprt->address_strings[i]); 331 } 332 } 333 334 static size_t 335 xs_alloc_sparse_pages(struct xdr_buf *buf, size_t want, gfp_t gfp) 336 { 337 size_t i,n; 338 339 if (!want || !(buf->flags & XDRBUF_SPARSE_PAGES)) 340 return want; 341 n = (buf->page_base + want + PAGE_SIZE - 1) >> PAGE_SHIFT; 342 for (i = 0; i < n; i++) { 343 if (buf->pages[i]) 344 continue; 345 buf->bvec[i].bv_page = buf->pages[i] = alloc_page(gfp); 346 if (!buf->pages[i]) { 347 i *= PAGE_SIZE; 348 return i > buf->page_base ? i - buf->page_base : 0; 349 } 350 } 351 return want; 352 } 353 354 static ssize_t 355 xs_sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags, size_t seek) 356 { 357 ssize_t ret; 358 if (seek != 0) 359 iov_iter_advance(&msg->msg_iter, seek); 360 ret = sock_recvmsg(sock, msg, flags); 361 return ret > 0 ? ret + seek : ret; 362 } 363 364 static ssize_t 365 xs_read_kvec(struct socket *sock, struct msghdr *msg, int flags, 366 struct kvec *kvec, size_t count, size_t seek) 367 { 368 iov_iter_kvec(&msg->msg_iter, ITER_DEST, kvec, 1, count); 369 return xs_sock_recvmsg(sock, msg, flags, seek); 370 } 371 372 static ssize_t 373 xs_read_bvec(struct socket *sock, struct msghdr *msg, int flags, 374 struct bio_vec *bvec, unsigned long nr, size_t count, 375 size_t seek) 376 { 377 iov_iter_bvec(&msg->msg_iter, ITER_DEST, bvec, nr, count); 378 return xs_sock_recvmsg(sock, msg, flags, seek); 379 } 380 381 static ssize_t 382 xs_read_discard(struct socket *sock, struct msghdr *msg, int flags, 383 size_t count) 384 { 385 iov_iter_discard(&msg->msg_iter, ITER_DEST, count); 386 return sock_recvmsg(sock, msg, flags); 387 } 388 389 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 390 static void 391 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 392 { 393 struct bvec_iter bi = { 394 .bi_size = count, 395 }; 396 struct bio_vec bv; 397 398 bvec_iter_advance(bvec, &bi, seek & PAGE_MASK); 399 for_each_bvec(bv, bvec, bi, bi) 400 flush_dcache_page(bv.bv_page); 401 } 402 #else 403 static inline void 404 xs_flush_bvec(const struct bio_vec *bvec, size_t count, size_t seek) 405 { 406 } 407 #endif 408 409 static ssize_t 410 xs_read_xdr_buf(struct socket *sock, struct msghdr *msg, int flags, 411 struct xdr_buf *buf, size_t count, size_t seek, size_t *read) 412 { 413 size_t want, seek_init = seek, offset = 0; 414 ssize_t ret; 415 416 want = min_t(size_t, count, buf->head[0].iov_len); 417 if (seek < want) { 418 ret = xs_read_kvec(sock, msg, flags, &buf->head[0], want, seek); 419 if (ret <= 0) 420 goto sock_err; 421 offset += ret; 422 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 423 goto out; 424 if (ret != want) 425 goto out; 426 seek = 0; 427 } else { 428 seek -= want; 429 offset += want; 430 } 431 432 want = xs_alloc_sparse_pages( 433 buf, min_t(size_t, count - offset, buf->page_len), 434 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); 435 if (seek < want) { 436 ret = xs_read_bvec(sock, msg, flags, buf->bvec, 437 xdr_buf_pagecount(buf), 438 want + buf->page_base, 439 seek + buf->page_base); 440 if (ret <= 0) 441 goto sock_err; 442 xs_flush_bvec(buf->bvec, ret, seek + buf->page_base); 443 ret -= buf->page_base; 444 offset += ret; 445 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 446 goto out; 447 if (ret != want) 448 goto out; 449 seek = 0; 450 } else { 451 seek -= want; 452 offset += want; 453 } 454 455 want = min_t(size_t, count - offset, buf->tail[0].iov_len); 456 if (seek < want) { 457 ret = xs_read_kvec(sock, msg, flags, &buf->tail[0], want, seek); 458 if (ret <= 0) 459 goto sock_err; 460 offset += ret; 461 if (offset == count || msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 462 goto out; 463 if (ret != want) 464 goto out; 465 } else if (offset < seek_init) 466 offset = seek_init; 467 ret = -EMSGSIZE; 468 out: 469 *read = offset - seek_init; 470 return ret; 471 sock_err: 472 offset += seek; 473 goto out; 474 } 475 476 static void 477 xs_read_header(struct sock_xprt *transport, struct xdr_buf *buf) 478 { 479 if (!transport->recv.copied) { 480 if (buf->head[0].iov_len >= transport->recv.offset) 481 memcpy(buf->head[0].iov_base, 482 &transport->recv.xid, 483 transport->recv.offset); 484 transport->recv.copied = transport->recv.offset; 485 } 486 } 487 488 static bool 489 xs_read_stream_request_done(struct sock_xprt *transport) 490 { 491 return transport->recv.fraghdr & cpu_to_be32(RPC_LAST_STREAM_FRAGMENT); 492 } 493 494 static void 495 xs_read_stream_check_eor(struct sock_xprt *transport, 496 struct msghdr *msg) 497 { 498 if (xs_read_stream_request_done(transport)) 499 msg->msg_flags |= MSG_EOR; 500 } 501 502 static ssize_t 503 xs_read_stream_request(struct sock_xprt *transport, struct msghdr *msg, 504 int flags, struct rpc_rqst *req) 505 { 506 struct xdr_buf *buf = &req->rq_private_buf; 507 size_t want, read; 508 ssize_t ret; 509 510 xs_read_header(transport, buf); 511 512 want = transport->recv.len - transport->recv.offset; 513 if (want != 0) { 514 ret = xs_read_xdr_buf(transport->sock, msg, flags, buf, 515 transport->recv.copied + want, 516 transport->recv.copied, 517 &read); 518 transport->recv.offset += read; 519 transport->recv.copied += read; 520 } 521 522 if (transport->recv.offset == transport->recv.len) 523 xs_read_stream_check_eor(transport, msg); 524 525 if (want == 0) 526 return 0; 527 528 switch (ret) { 529 default: 530 break; 531 case -EFAULT: 532 case -EMSGSIZE: 533 msg->msg_flags |= MSG_TRUNC; 534 return read; 535 case 0: 536 return -ESHUTDOWN; 537 } 538 return ret < 0 ? ret : read; 539 } 540 541 static size_t 542 xs_read_stream_headersize(bool isfrag) 543 { 544 if (isfrag) 545 return sizeof(__be32); 546 return 3 * sizeof(__be32); 547 } 548 549 static ssize_t 550 xs_read_stream_header(struct sock_xprt *transport, struct msghdr *msg, 551 int flags, size_t want, size_t seek) 552 { 553 struct kvec kvec = { 554 .iov_base = &transport->recv.fraghdr, 555 .iov_len = want, 556 }; 557 return xs_read_kvec(transport->sock, msg, flags, &kvec, want, seek); 558 } 559 560 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 561 static ssize_t 562 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 563 { 564 struct rpc_xprt *xprt = &transport->xprt; 565 struct rpc_rqst *req; 566 ssize_t ret; 567 568 /* Is this transport associated with the backchannel? */ 569 if (!xprt->bc_serv) 570 return -ESHUTDOWN; 571 572 /* Look up and lock the request corresponding to the given XID */ 573 req = xprt_lookup_bc_request(xprt, transport->recv.xid); 574 if (!req) { 575 printk(KERN_WARNING "Callback slot table overflowed\n"); 576 return -ESHUTDOWN; 577 } 578 if (transport->recv.copied && !req->rq_private_buf.len) 579 return -ESHUTDOWN; 580 581 ret = xs_read_stream_request(transport, msg, flags, req); 582 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 583 xprt_complete_bc_request(req, transport->recv.copied); 584 else 585 req->rq_private_buf.len = transport->recv.copied; 586 587 return ret; 588 } 589 #else /* CONFIG_SUNRPC_BACKCHANNEL */ 590 static ssize_t 591 xs_read_stream_call(struct sock_xprt *transport, struct msghdr *msg, int flags) 592 { 593 return -ESHUTDOWN; 594 } 595 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 596 597 static ssize_t 598 xs_read_stream_reply(struct sock_xprt *transport, struct msghdr *msg, int flags) 599 { 600 struct rpc_xprt *xprt = &transport->xprt; 601 struct rpc_rqst *req; 602 ssize_t ret = 0; 603 604 /* Look up and lock the request corresponding to the given XID */ 605 spin_lock(&xprt->queue_lock); 606 req = xprt_lookup_rqst(xprt, transport->recv.xid); 607 if (!req || (transport->recv.copied && !req->rq_private_buf.len)) { 608 msg->msg_flags |= MSG_TRUNC; 609 goto out; 610 } 611 xprt_pin_rqst(req); 612 spin_unlock(&xprt->queue_lock); 613 614 ret = xs_read_stream_request(transport, msg, flags, req); 615 616 spin_lock(&xprt->queue_lock); 617 if (msg->msg_flags & (MSG_EOR|MSG_TRUNC)) 618 xprt_complete_rqst(req->rq_task, transport->recv.copied); 619 else 620 req->rq_private_buf.len = transport->recv.copied; 621 xprt_unpin_rqst(req); 622 out: 623 spin_unlock(&xprt->queue_lock); 624 return ret; 625 } 626 627 static ssize_t 628 xs_read_stream(struct sock_xprt *transport, int flags) 629 { 630 struct msghdr msg = { 0 }; 631 size_t want, read = 0; 632 ssize_t ret = 0; 633 634 if (transport->recv.len == 0) { 635 want = xs_read_stream_headersize(transport->recv.copied != 0); 636 ret = xs_read_stream_header(transport, &msg, flags, want, 637 transport->recv.offset); 638 if (ret <= 0) 639 goto out_err; 640 transport->recv.offset = ret; 641 if (transport->recv.offset != want) 642 return transport->recv.offset; 643 transport->recv.len = be32_to_cpu(transport->recv.fraghdr) & 644 RPC_FRAGMENT_SIZE_MASK; 645 transport->recv.offset -= sizeof(transport->recv.fraghdr); 646 read = ret; 647 } 648 649 switch (be32_to_cpu(transport->recv.calldir)) { 650 default: 651 msg.msg_flags |= MSG_TRUNC; 652 break; 653 case RPC_CALL: 654 ret = xs_read_stream_call(transport, &msg, flags); 655 break; 656 case RPC_REPLY: 657 ret = xs_read_stream_reply(transport, &msg, flags); 658 } 659 if (msg.msg_flags & MSG_TRUNC) { 660 transport->recv.calldir = cpu_to_be32(-1); 661 transport->recv.copied = -1; 662 } 663 if (ret < 0) 664 goto out_err; 665 read += ret; 666 if (transport->recv.offset < transport->recv.len) { 667 if (!(msg.msg_flags & MSG_TRUNC)) 668 return read; 669 msg.msg_flags = 0; 670 ret = xs_read_discard(transport->sock, &msg, flags, 671 transport->recv.len - transport->recv.offset); 672 if (ret <= 0) 673 goto out_err; 674 transport->recv.offset += ret; 675 read += ret; 676 if (transport->recv.offset != transport->recv.len) 677 return read; 678 } 679 if (xs_read_stream_request_done(transport)) { 680 trace_xs_stream_read_request(transport); 681 transport->recv.copied = 0; 682 } 683 transport->recv.offset = 0; 684 transport->recv.len = 0; 685 return read; 686 out_err: 687 return ret != 0 ? ret : -ESHUTDOWN; 688 } 689 690 static __poll_t xs_poll_socket(struct sock_xprt *transport) 691 { 692 return transport->sock->ops->poll(transport->file, transport->sock, 693 NULL); 694 } 695 696 static bool xs_poll_socket_readable(struct sock_xprt *transport) 697 { 698 __poll_t events = xs_poll_socket(transport); 699 700 return (events & (EPOLLIN | EPOLLRDNORM)) && !(events & EPOLLRDHUP); 701 } 702 703 static void xs_poll_check_readable(struct sock_xprt *transport) 704 { 705 706 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 707 if (!xs_poll_socket_readable(transport)) 708 return; 709 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 710 queue_work(xprtiod_workqueue, &transport->recv_worker); 711 } 712 713 static void xs_stream_data_receive(struct sock_xprt *transport) 714 { 715 size_t read = 0; 716 ssize_t ret = 0; 717 718 mutex_lock(&transport->recv_mutex); 719 if (transport->sock == NULL) 720 goto out; 721 for (;;) { 722 ret = xs_read_stream(transport, MSG_DONTWAIT); 723 if (ret < 0) 724 break; 725 read += ret; 726 cond_resched(); 727 } 728 if (ret == -ESHUTDOWN) 729 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 730 else 731 xs_poll_check_readable(transport); 732 out: 733 mutex_unlock(&transport->recv_mutex); 734 trace_xs_stream_read_data(&transport->xprt, ret, read); 735 } 736 737 static void xs_stream_data_receive_workfn(struct work_struct *work) 738 { 739 struct sock_xprt *transport = 740 container_of(work, struct sock_xprt, recv_worker); 741 unsigned int pflags = memalloc_nofs_save(); 742 743 xs_stream_data_receive(transport); 744 memalloc_nofs_restore(pflags); 745 } 746 747 static void 748 xs_stream_reset_connect(struct sock_xprt *transport) 749 { 750 transport->recv.offset = 0; 751 transport->recv.len = 0; 752 transport->recv.copied = 0; 753 transport->xmit.offset = 0; 754 } 755 756 static void 757 xs_stream_start_connect(struct sock_xprt *transport) 758 { 759 transport->xprt.stat.connect_count++; 760 transport->xprt.stat.connect_start = jiffies; 761 } 762 763 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 764 765 /** 766 * xs_nospace - handle transmit was incomplete 767 * @req: pointer to RPC request 768 * @transport: pointer to struct sock_xprt 769 * 770 */ 771 static int xs_nospace(struct rpc_rqst *req, struct sock_xprt *transport) 772 { 773 struct rpc_xprt *xprt = &transport->xprt; 774 struct sock *sk = transport->inet; 775 int ret = -EAGAIN; 776 777 trace_rpc_socket_nospace(req, transport); 778 779 /* Protect against races with write_space */ 780 spin_lock(&xprt->transport_lock); 781 782 /* Don't race with disconnect */ 783 if (xprt_connected(xprt)) { 784 /* wait for more buffer space */ 785 set_bit(XPRT_SOCK_NOSPACE, &transport->sock_state); 786 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 787 sk->sk_write_pending++; 788 xprt_wait_for_buffer_space(xprt); 789 } else 790 ret = -ENOTCONN; 791 792 spin_unlock(&xprt->transport_lock); 793 return ret; 794 } 795 796 static int xs_sock_nospace(struct rpc_rqst *req) 797 { 798 struct sock_xprt *transport = 799 container_of(req->rq_xprt, struct sock_xprt, xprt); 800 struct sock *sk = transport->inet; 801 int ret = -EAGAIN; 802 803 lock_sock(sk); 804 if (!sock_writeable(sk)) 805 ret = xs_nospace(req, transport); 806 release_sock(sk); 807 return ret; 808 } 809 810 static int xs_stream_nospace(struct rpc_rqst *req, bool vm_wait) 811 { 812 struct sock_xprt *transport = 813 container_of(req->rq_xprt, struct sock_xprt, xprt); 814 struct sock *sk = transport->inet; 815 int ret = -EAGAIN; 816 817 if (vm_wait) 818 return -ENOBUFS; 819 lock_sock(sk); 820 if (!sk_stream_memory_free(sk)) 821 ret = xs_nospace(req, transport); 822 release_sock(sk); 823 return ret; 824 } 825 826 static int xs_stream_prepare_request(struct rpc_rqst *req, struct xdr_buf *buf) 827 { 828 return xdr_alloc_bvec(buf, rpc_task_gfp_mask()); 829 } 830 831 /* 832 * Determine if the previous message in the stream was aborted before it 833 * could complete transmission. 834 */ 835 static bool 836 xs_send_request_was_aborted(struct sock_xprt *transport, struct rpc_rqst *req) 837 { 838 return transport->xmit.offset != 0 && req->rq_bytes_sent == 0; 839 } 840 841 /* 842 * Return the stream record marker field for a record of length < 2^31-1 843 */ 844 static rpc_fraghdr 845 xs_stream_record_marker(struct xdr_buf *xdr) 846 { 847 if (!xdr->len) 848 return 0; 849 return cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | (u32)xdr->len); 850 } 851 852 /** 853 * xs_local_send_request - write an RPC request to an AF_LOCAL socket 854 * @req: pointer to RPC request 855 * 856 * Return values: 857 * 0: The request has been sent 858 * EAGAIN: The socket was blocked, please call again later to 859 * complete the request 860 * ENOTCONN: Caller needs to invoke connect logic then call again 861 * other: Some other error occurred, the request was not sent 862 */ 863 static int xs_local_send_request(struct rpc_rqst *req) 864 { 865 struct rpc_xprt *xprt = req->rq_xprt; 866 struct sock_xprt *transport = 867 container_of(xprt, struct sock_xprt, xprt); 868 struct xdr_buf *xdr = &req->rq_snd_buf; 869 rpc_fraghdr rm = xs_stream_record_marker(xdr); 870 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 871 struct msghdr msg = { 872 .msg_flags = XS_SENDMSG_FLAGS, 873 }; 874 bool vm_wait; 875 unsigned int sent; 876 int status; 877 878 /* Close the stream if the previous transmission was incomplete */ 879 if (xs_send_request_was_aborted(transport, req)) { 880 xprt_force_disconnect(xprt); 881 return -ENOTCONN; 882 } 883 884 xs_pktdump("packet data:", 885 req->rq_svec->iov_base, req->rq_svec->iov_len); 886 887 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false; 888 889 req->rq_xtime = ktime_get(); 890 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 891 transport->xmit.offset, rm, &sent); 892 dprintk("RPC: %s(%u) = %d\n", 893 __func__, xdr->len - transport->xmit.offset, status); 894 895 if (likely(sent > 0) || status == 0) { 896 transport->xmit.offset += sent; 897 req->rq_bytes_sent = transport->xmit.offset; 898 if (likely(req->rq_bytes_sent >= msglen)) { 899 req->rq_xmit_bytes_sent += transport->xmit.offset; 900 transport->xmit.offset = 0; 901 return 0; 902 } 903 status = -EAGAIN; 904 vm_wait = false; 905 } 906 907 switch (status) { 908 case -EAGAIN: 909 status = xs_stream_nospace(req, vm_wait); 910 break; 911 default: 912 dprintk("RPC: sendmsg returned unrecognized error %d\n", 913 -status); 914 fallthrough; 915 case -EPIPE: 916 xprt_force_disconnect(xprt); 917 status = -ENOTCONN; 918 } 919 920 return status; 921 } 922 923 /** 924 * xs_udp_send_request - write an RPC request to a UDP socket 925 * @req: pointer to RPC request 926 * 927 * Return values: 928 * 0: The request has been sent 929 * EAGAIN: The socket was blocked, please call again later to 930 * complete the request 931 * ENOTCONN: Caller needs to invoke connect logic then call again 932 * other: Some other error occurred, the request was not sent 933 */ 934 static int xs_udp_send_request(struct rpc_rqst *req) 935 { 936 struct rpc_xprt *xprt = req->rq_xprt; 937 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 938 struct xdr_buf *xdr = &req->rq_snd_buf; 939 struct msghdr msg = { 940 .msg_name = xs_addr(xprt), 941 .msg_namelen = xprt->addrlen, 942 .msg_flags = XS_SENDMSG_FLAGS, 943 }; 944 unsigned int sent; 945 int status; 946 947 xs_pktdump("packet data:", 948 req->rq_svec->iov_base, 949 req->rq_svec->iov_len); 950 951 if (!xprt_bound(xprt)) 952 return -ENOTCONN; 953 954 if (!xprt_request_get_cong(xprt, req)) 955 return -EBADSLT; 956 957 status = xdr_alloc_bvec(xdr, rpc_task_gfp_mask()); 958 if (status < 0) 959 return status; 960 req->rq_xtime = ktime_get(); 961 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, 0, &sent); 962 963 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 964 xdr->len, status); 965 966 /* firewall is blocking us, don't return -EAGAIN or we end up looping */ 967 if (status == -EPERM) 968 goto process_status; 969 970 if (status == -EAGAIN && sock_writeable(transport->inet)) 971 status = -ENOBUFS; 972 973 if (sent > 0 || status == 0) { 974 req->rq_xmit_bytes_sent += sent; 975 if (sent >= req->rq_slen) 976 return 0; 977 /* Still some bytes left; set up for a retry later. */ 978 status = -EAGAIN; 979 } 980 981 process_status: 982 switch (status) { 983 case -ENOTSOCK: 984 status = -ENOTCONN; 985 /* Should we call xs_close() here? */ 986 break; 987 case -EAGAIN: 988 status = xs_sock_nospace(req); 989 break; 990 case -ENETUNREACH: 991 case -ENOBUFS: 992 case -EPIPE: 993 case -ECONNREFUSED: 994 case -EPERM: 995 /* When the server has died, an ICMP port unreachable message 996 * prompts ECONNREFUSED. */ 997 break; 998 default: 999 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1000 -status); 1001 } 1002 1003 return status; 1004 } 1005 1006 /** 1007 * xs_tcp_send_request - write an RPC request to a TCP socket 1008 * @req: pointer to RPC request 1009 * 1010 * Return values: 1011 * 0: The request has been sent 1012 * EAGAIN: The socket was blocked, please call again later to 1013 * complete the request 1014 * ENOTCONN: Caller needs to invoke connect logic then call again 1015 * other: Some other error occurred, the request was not sent 1016 * 1017 * XXX: In the case of soft timeouts, should we eventually give up 1018 * if sendmsg is not able to make progress? 1019 */ 1020 static int xs_tcp_send_request(struct rpc_rqst *req) 1021 { 1022 struct rpc_xprt *xprt = req->rq_xprt; 1023 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1024 struct xdr_buf *xdr = &req->rq_snd_buf; 1025 rpc_fraghdr rm = xs_stream_record_marker(xdr); 1026 unsigned int msglen = rm ? req->rq_slen + sizeof(rm) : req->rq_slen; 1027 struct msghdr msg = { 1028 .msg_flags = XS_SENDMSG_FLAGS, 1029 }; 1030 bool vm_wait; 1031 unsigned int sent; 1032 int status; 1033 1034 /* Close the stream if the previous transmission was incomplete */ 1035 if (xs_send_request_was_aborted(transport, req)) { 1036 if (transport->sock != NULL) 1037 kernel_sock_shutdown(transport->sock, SHUT_RDWR); 1038 return -ENOTCONN; 1039 } 1040 if (!transport->inet) 1041 return -ENOTCONN; 1042 1043 xs_pktdump("packet data:", 1044 req->rq_svec->iov_base, 1045 req->rq_svec->iov_len); 1046 1047 if (test_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state)) 1048 xs_tcp_set_socket_timeouts(xprt, transport->sock); 1049 1050 xs_set_srcport(transport, transport->sock); 1051 1052 /* Continue transmitting the packet/record. We must be careful 1053 * to cope with writespace callbacks arriving _after_ we have 1054 * called sendmsg(). */ 1055 req->rq_xtime = ktime_get(); 1056 tcp_sock_set_cork(transport->inet, true); 1057 1058 vm_wait = sk_stream_is_writeable(transport->inet) ? true : false; 1059 1060 do { 1061 status = xprt_sock_sendmsg(transport->sock, &msg, xdr, 1062 transport->xmit.offset, rm, &sent); 1063 1064 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 1065 xdr->len - transport->xmit.offset, status); 1066 1067 /* If we've sent the entire packet, immediately 1068 * reset the count of bytes sent. */ 1069 transport->xmit.offset += sent; 1070 req->rq_bytes_sent = transport->xmit.offset; 1071 if (likely(req->rq_bytes_sent >= msglen)) { 1072 req->rq_xmit_bytes_sent += transport->xmit.offset; 1073 transport->xmit.offset = 0; 1074 if (atomic_long_read(&xprt->xmit_queuelen) == 1) 1075 tcp_sock_set_cork(transport->inet, false); 1076 return 0; 1077 } 1078 1079 WARN_ON_ONCE(sent == 0 && status == 0); 1080 1081 if (sent > 0) 1082 vm_wait = false; 1083 1084 } while (status == 0); 1085 1086 switch (status) { 1087 case -ENOTSOCK: 1088 status = -ENOTCONN; 1089 /* Should we call xs_close() here? */ 1090 break; 1091 case -EAGAIN: 1092 status = xs_stream_nospace(req, vm_wait); 1093 break; 1094 case -ECONNRESET: 1095 case -ECONNREFUSED: 1096 case -ENOTCONN: 1097 case -EADDRINUSE: 1098 case -ENOBUFS: 1099 case -EPIPE: 1100 break; 1101 default: 1102 dprintk("RPC: sendmsg returned unrecognized error %d\n", 1103 -status); 1104 } 1105 1106 return status; 1107 } 1108 1109 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1110 { 1111 transport->old_data_ready = sk->sk_data_ready; 1112 transport->old_state_change = sk->sk_state_change; 1113 transport->old_write_space = sk->sk_write_space; 1114 transport->old_error_report = sk->sk_error_report; 1115 } 1116 1117 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk) 1118 { 1119 sk->sk_data_ready = transport->old_data_ready; 1120 sk->sk_state_change = transport->old_state_change; 1121 sk->sk_write_space = transport->old_write_space; 1122 sk->sk_error_report = transport->old_error_report; 1123 } 1124 1125 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt) 1126 { 1127 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1128 1129 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state); 1130 clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state); 1131 clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state); 1132 clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state); 1133 clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state); 1134 } 1135 1136 static void xs_run_error_worker(struct sock_xprt *transport, unsigned int nr) 1137 { 1138 set_bit(nr, &transport->sock_state); 1139 queue_work(xprtiod_workqueue, &transport->error_worker); 1140 } 1141 1142 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt) 1143 { 1144 xprt->connect_cookie++; 1145 smp_mb__before_atomic(); 1146 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1147 clear_bit(XPRT_CLOSING, &xprt->state); 1148 xs_sock_reset_state_flags(xprt); 1149 smp_mb__after_atomic(); 1150 } 1151 1152 /** 1153 * xs_error_report - callback to handle TCP socket state errors 1154 * @sk: socket 1155 * 1156 * Note: we don't call sock_error() since there may be a rpc_task 1157 * using the socket, and so we don't want to clear sk->sk_err. 1158 */ 1159 static void xs_error_report(struct sock *sk) 1160 { 1161 struct sock_xprt *transport; 1162 struct rpc_xprt *xprt; 1163 1164 if (!(xprt = xprt_from_sock(sk))) 1165 return; 1166 1167 transport = container_of(xprt, struct sock_xprt, xprt); 1168 transport->xprt_err = -sk->sk_err; 1169 if (transport->xprt_err == 0) 1170 return; 1171 dprintk("RPC: xs_error_report client %p, error=%d...\n", 1172 xprt, -transport->xprt_err); 1173 trace_rpc_socket_error(xprt, sk->sk_socket, transport->xprt_err); 1174 1175 /* barrier ensures xprt_err is set before XPRT_SOCK_WAKE_ERROR */ 1176 smp_mb__before_atomic(); 1177 xs_run_error_worker(transport, XPRT_SOCK_WAKE_ERROR); 1178 } 1179 1180 static void xs_reset_transport(struct sock_xprt *transport) 1181 { 1182 struct socket *sock = transport->sock; 1183 struct sock *sk = transport->inet; 1184 struct rpc_xprt *xprt = &transport->xprt; 1185 struct file *filp = transport->file; 1186 1187 if (sk == NULL) 1188 return; 1189 /* 1190 * Make sure we're calling this in a context from which it is safe 1191 * to call __fput_sync(). In practice that means rpciod and the 1192 * system workqueue. 1193 */ 1194 if (!(current->flags & PF_WQ_WORKER)) { 1195 WARN_ON_ONCE(1); 1196 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 1197 return; 1198 } 1199 1200 if (atomic_read(&transport->xprt.swapper)) 1201 sk_clear_memalloc(sk); 1202 1203 kernel_sock_shutdown(sock, SHUT_RDWR); 1204 1205 mutex_lock(&transport->recv_mutex); 1206 lock_sock(sk); 1207 transport->inet = NULL; 1208 transport->sock = NULL; 1209 transport->file = NULL; 1210 1211 sk->sk_user_data = NULL; 1212 1213 xs_restore_old_callbacks(transport, sk); 1214 xprt_clear_connected(xprt); 1215 xs_sock_reset_connection_flags(xprt); 1216 /* Reset stream record info */ 1217 xs_stream_reset_connect(transport); 1218 release_sock(sk); 1219 mutex_unlock(&transport->recv_mutex); 1220 1221 trace_rpc_socket_close(xprt, sock); 1222 __fput_sync(filp); 1223 1224 xprt_disconnect_done(xprt); 1225 } 1226 1227 /** 1228 * xs_close - close a socket 1229 * @xprt: transport 1230 * 1231 * This is used when all requests are complete; ie, no DRC state remains 1232 * on the server we want to save. 1233 * 1234 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with 1235 * xs_reset_transport() zeroing the socket from underneath a writer. 1236 */ 1237 static void xs_close(struct rpc_xprt *xprt) 1238 { 1239 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1240 1241 dprintk("RPC: xs_close xprt %p\n", xprt); 1242 1243 xs_reset_transport(transport); 1244 xprt->reestablish_timeout = 0; 1245 } 1246 1247 static void xs_inject_disconnect(struct rpc_xprt *xprt) 1248 { 1249 dprintk("RPC: injecting transport disconnect on xprt=%p\n", 1250 xprt); 1251 xprt_disconnect_done(xprt); 1252 } 1253 1254 static void xs_xprt_free(struct rpc_xprt *xprt) 1255 { 1256 xs_free_peer_addresses(xprt); 1257 xprt_free(xprt); 1258 } 1259 1260 /** 1261 * xs_destroy - prepare to shutdown a transport 1262 * @xprt: doomed transport 1263 * 1264 */ 1265 static void xs_destroy(struct rpc_xprt *xprt) 1266 { 1267 struct sock_xprt *transport = container_of(xprt, 1268 struct sock_xprt, xprt); 1269 dprintk("RPC: xs_destroy xprt %p\n", xprt); 1270 1271 cancel_delayed_work_sync(&transport->connect_worker); 1272 xs_close(xprt); 1273 cancel_work_sync(&transport->recv_worker); 1274 cancel_work_sync(&transport->error_worker); 1275 xs_xprt_free(xprt); 1276 module_put(THIS_MODULE); 1277 } 1278 1279 /** 1280 * xs_udp_data_read_skb - receive callback for UDP sockets 1281 * @xprt: transport 1282 * @sk: socket 1283 * @skb: skbuff 1284 * 1285 */ 1286 static void xs_udp_data_read_skb(struct rpc_xprt *xprt, 1287 struct sock *sk, 1288 struct sk_buff *skb) 1289 { 1290 struct rpc_task *task; 1291 struct rpc_rqst *rovr; 1292 int repsize, copied; 1293 u32 _xid; 1294 __be32 *xp; 1295 1296 repsize = skb->len; 1297 if (repsize < 4) { 1298 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 1299 return; 1300 } 1301 1302 /* Copy the XID from the skb... */ 1303 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid); 1304 if (xp == NULL) 1305 return; 1306 1307 /* Look up and lock the request corresponding to the given XID */ 1308 spin_lock(&xprt->queue_lock); 1309 rovr = xprt_lookup_rqst(xprt, *xp); 1310 if (!rovr) 1311 goto out_unlock; 1312 xprt_pin_rqst(rovr); 1313 xprt_update_rtt(rovr->rq_task); 1314 spin_unlock(&xprt->queue_lock); 1315 task = rovr->rq_task; 1316 1317 if ((copied = rovr->rq_private_buf.buflen) > repsize) 1318 copied = repsize; 1319 1320 /* Suck it into the iovec, verify checksum if not done by hw. */ 1321 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) { 1322 spin_lock(&xprt->queue_lock); 1323 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS); 1324 goto out_unpin; 1325 } 1326 1327 1328 spin_lock(&xprt->transport_lock); 1329 xprt_adjust_cwnd(xprt, task, copied); 1330 spin_unlock(&xprt->transport_lock); 1331 spin_lock(&xprt->queue_lock); 1332 xprt_complete_rqst(task, copied); 1333 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS); 1334 out_unpin: 1335 xprt_unpin_rqst(rovr); 1336 out_unlock: 1337 spin_unlock(&xprt->queue_lock); 1338 } 1339 1340 static void xs_udp_data_receive(struct sock_xprt *transport) 1341 { 1342 struct sk_buff *skb; 1343 struct sock *sk; 1344 int err; 1345 1346 mutex_lock(&transport->recv_mutex); 1347 sk = transport->inet; 1348 if (sk == NULL) 1349 goto out; 1350 for (;;) { 1351 skb = skb_recv_udp(sk, MSG_DONTWAIT, &err); 1352 if (skb == NULL) 1353 break; 1354 xs_udp_data_read_skb(&transport->xprt, sk, skb); 1355 consume_skb(skb); 1356 cond_resched(); 1357 } 1358 xs_poll_check_readable(transport); 1359 out: 1360 mutex_unlock(&transport->recv_mutex); 1361 } 1362 1363 static void xs_udp_data_receive_workfn(struct work_struct *work) 1364 { 1365 struct sock_xprt *transport = 1366 container_of(work, struct sock_xprt, recv_worker); 1367 unsigned int pflags = memalloc_nofs_save(); 1368 1369 xs_udp_data_receive(transport); 1370 memalloc_nofs_restore(pflags); 1371 } 1372 1373 /** 1374 * xs_data_ready - "data ready" callback for sockets 1375 * @sk: socket with data to read 1376 * 1377 */ 1378 static void xs_data_ready(struct sock *sk) 1379 { 1380 struct rpc_xprt *xprt; 1381 1382 trace_sk_data_ready(sk); 1383 1384 xprt = xprt_from_sock(sk); 1385 if (xprt != NULL) { 1386 struct sock_xprt *transport = container_of(xprt, 1387 struct sock_xprt, xprt); 1388 1389 trace_xs_data_ready(xprt); 1390 1391 transport->old_data_ready(sk); 1392 /* Any data means we had a useful conversation, so 1393 * then we don't need to delay the next reconnect 1394 */ 1395 if (xprt->reestablish_timeout) 1396 xprt->reestablish_timeout = 0; 1397 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state)) 1398 queue_work(xprtiod_workqueue, &transport->recv_worker); 1399 } 1400 } 1401 1402 /* 1403 * Helper function to force a TCP close if the server is sending 1404 * junk and/or it has put us in CLOSE_WAIT 1405 */ 1406 static void xs_tcp_force_close(struct rpc_xprt *xprt) 1407 { 1408 xprt_force_disconnect(xprt); 1409 } 1410 1411 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 1412 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt) 1413 { 1414 return PAGE_SIZE; 1415 } 1416 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 1417 1418 /** 1419 * xs_local_state_change - callback to handle AF_LOCAL socket state changes 1420 * @sk: socket whose state has changed 1421 * 1422 */ 1423 static void xs_local_state_change(struct sock *sk) 1424 { 1425 struct rpc_xprt *xprt; 1426 struct sock_xprt *transport; 1427 1428 if (!(xprt = xprt_from_sock(sk))) 1429 return; 1430 transport = container_of(xprt, struct sock_xprt, xprt); 1431 if (sk->sk_shutdown & SHUTDOWN_MASK) { 1432 clear_bit(XPRT_CONNECTED, &xprt->state); 1433 /* Trigger the socket release */ 1434 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1435 } 1436 } 1437 1438 /** 1439 * xs_tcp_state_change - callback to handle TCP socket state changes 1440 * @sk: socket whose state has changed 1441 * 1442 */ 1443 static void xs_tcp_state_change(struct sock *sk) 1444 { 1445 struct rpc_xprt *xprt; 1446 struct sock_xprt *transport; 1447 1448 if (!(xprt = xprt_from_sock(sk))) 1449 return; 1450 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 1451 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", 1452 sk->sk_state, xprt_connected(xprt), 1453 sock_flag(sk, SOCK_DEAD), 1454 sock_flag(sk, SOCK_ZAPPED), 1455 sk->sk_shutdown); 1456 1457 transport = container_of(xprt, struct sock_xprt, xprt); 1458 trace_rpc_socket_state_change(xprt, sk->sk_socket); 1459 switch (sk->sk_state) { 1460 case TCP_ESTABLISHED: 1461 if (!xprt_test_and_set_connected(xprt)) { 1462 xprt->connect_cookie++; 1463 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 1464 xprt_clear_connecting(xprt); 1465 1466 xprt->stat.connect_count++; 1467 xprt->stat.connect_time += (long)jiffies - 1468 xprt->stat.connect_start; 1469 xs_run_error_worker(transport, XPRT_SOCK_WAKE_PENDING); 1470 } 1471 break; 1472 case TCP_FIN_WAIT1: 1473 /* The client initiated a shutdown of the socket */ 1474 xprt->connect_cookie++; 1475 xprt->reestablish_timeout = 0; 1476 set_bit(XPRT_CLOSING, &xprt->state); 1477 smp_mb__before_atomic(); 1478 clear_bit(XPRT_CONNECTED, &xprt->state); 1479 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 1480 smp_mb__after_atomic(); 1481 break; 1482 case TCP_CLOSE_WAIT: 1483 /* The server initiated a shutdown of the socket */ 1484 xprt->connect_cookie++; 1485 clear_bit(XPRT_CONNECTED, &xprt->state); 1486 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1487 fallthrough; 1488 case TCP_CLOSING: 1489 /* 1490 * If the server closed down the connection, make sure that 1491 * we back off before reconnecting 1492 */ 1493 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 1494 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1495 break; 1496 case TCP_LAST_ACK: 1497 set_bit(XPRT_CLOSING, &xprt->state); 1498 smp_mb__before_atomic(); 1499 clear_bit(XPRT_CONNECTED, &xprt->state); 1500 smp_mb__after_atomic(); 1501 break; 1502 case TCP_CLOSE: 1503 if (test_and_clear_bit(XPRT_SOCK_CONNECTING, 1504 &transport->sock_state)) 1505 xprt_clear_connecting(xprt); 1506 clear_bit(XPRT_CLOSING, &xprt->state); 1507 /* Trigger the socket release */ 1508 xs_run_error_worker(transport, XPRT_SOCK_WAKE_DISCONNECT); 1509 } 1510 } 1511 1512 static void xs_write_space(struct sock *sk) 1513 { 1514 struct sock_xprt *transport; 1515 struct rpc_xprt *xprt; 1516 1517 if (!sk->sk_socket) 1518 return; 1519 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1520 1521 if (unlikely(!(xprt = xprt_from_sock(sk)))) 1522 return; 1523 transport = container_of(xprt, struct sock_xprt, xprt); 1524 if (!test_and_clear_bit(XPRT_SOCK_NOSPACE, &transport->sock_state)) 1525 return; 1526 xs_run_error_worker(transport, XPRT_SOCK_WAKE_WRITE); 1527 sk->sk_write_pending--; 1528 } 1529 1530 /** 1531 * xs_udp_write_space - callback invoked when socket buffer space 1532 * becomes available 1533 * @sk: socket whose state has changed 1534 * 1535 * Called when more output buffer space is available for this socket. 1536 * We try not to wake our writers until they can make "significant" 1537 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1538 * with a bunch of small requests. 1539 */ 1540 static void xs_udp_write_space(struct sock *sk) 1541 { 1542 /* from net/core/sock.c:sock_def_write_space */ 1543 if (sock_writeable(sk)) 1544 xs_write_space(sk); 1545 } 1546 1547 /** 1548 * xs_tcp_write_space - callback invoked when socket buffer space 1549 * becomes available 1550 * @sk: socket whose state has changed 1551 * 1552 * Called when more output buffer space is available for this socket. 1553 * We try not to wake our writers until they can make "significant" 1554 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 1555 * with a bunch of small requests. 1556 */ 1557 static void xs_tcp_write_space(struct sock *sk) 1558 { 1559 /* from net/core/stream.c:sk_stream_write_space */ 1560 if (sk_stream_is_writeable(sk)) 1561 xs_write_space(sk); 1562 } 1563 1564 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 1565 { 1566 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1567 struct sock *sk = transport->inet; 1568 1569 if (transport->rcvsize) { 1570 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1571 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; 1572 } 1573 if (transport->sndsize) { 1574 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 1575 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; 1576 sk->sk_write_space(sk); 1577 } 1578 } 1579 1580 /** 1581 * xs_udp_set_buffer_size - set send and receive limits 1582 * @xprt: generic transport 1583 * @sndsize: requested size of send buffer, in bytes 1584 * @rcvsize: requested size of receive buffer, in bytes 1585 * 1586 * Set socket send and receive buffer size limits. 1587 */ 1588 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 1589 { 1590 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1591 1592 transport->sndsize = 0; 1593 if (sndsize) 1594 transport->sndsize = sndsize + 1024; 1595 transport->rcvsize = 0; 1596 if (rcvsize) 1597 transport->rcvsize = rcvsize + 1024; 1598 1599 xs_udp_do_set_buffer_size(xprt); 1600 } 1601 1602 /** 1603 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 1604 * @xprt: controlling transport 1605 * @task: task that timed out 1606 * 1607 * Adjust the congestion window after a retransmit timeout has occurred. 1608 */ 1609 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task) 1610 { 1611 spin_lock(&xprt->transport_lock); 1612 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT); 1613 spin_unlock(&xprt->transport_lock); 1614 } 1615 1616 static int xs_get_random_port(void) 1617 { 1618 unsigned short min = xprt_min_resvport, max = xprt_max_resvport; 1619 unsigned short range; 1620 unsigned short rand; 1621 1622 if (max < min) 1623 return -EADDRINUSE; 1624 range = max - min + 1; 1625 rand = get_random_u32_below(range); 1626 return rand + min; 1627 } 1628 1629 static unsigned short xs_sock_getport(struct socket *sock) 1630 { 1631 struct sockaddr_storage buf; 1632 unsigned short port = 0; 1633 1634 if (kernel_getsockname(sock, (struct sockaddr *)&buf) < 0) 1635 goto out; 1636 switch (buf.ss_family) { 1637 case AF_INET6: 1638 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port); 1639 break; 1640 case AF_INET: 1641 port = ntohs(((struct sockaddr_in *)&buf)->sin_port); 1642 } 1643 out: 1644 return port; 1645 } 1646 1647 /** 1648 * xs_set_port - reset the port number in the remote endpoint address 1649 * @xprt: generic transport 1650 * @port: new port number 1651 * 1652 */ 1653 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 1654 { 1655 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 1656 1657 rpc_set_port(xs_addr(xprt), port); 1658 xs_update_peer_port(xprt); 1659 } 1660 1661 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock) 1662 { 1663 if (transport->srcport == 0 && transport->xprt.reuseport) 1664 transport->srcport = xs_sock_getport(sock); 1665 } 1666 1667 static int xs_get_srcport(struct sock_xprt *transport) 1668 { 1669 int port = transport->srcport; 1670 1671 if (port == 0 && transport->xprt.resvport) 1672 port = xs_get_random_port(); 1673 return port; 1674 } 1675 1676 static unsigned short xs_sock_srcport(struct rpc_xprt *xprt) 1677 { 1678 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1679 unsigned short ret = 0; 1680 mutex_lock(&sock->recv_mutex); 1681 if (sock->sock) 1682 ret = xs_sock_getport(sock->sock); 1683 mutex_unlock(&sock->recv_mutex); 1684 return ret; 1685 } 1686 1687 static int xs_sock_srcaddr(struct rpc_xprt *xprt, char *buf, size_t buflen) 1688 { 1689 struct sock_xprt *sock = container_of(xprt, struct sock_xprt, xprt); 1690 union { 1691 struct sockaddr sa; 1692 struct sockaddr_storage st; 1693 } saddr; 1694 int ret = -ENOTCONN; 1695 1696 mutex_lock(&sock->recv_mutex); 1697 if (sock->sock) { 1698 ret = kernel_getsockname(sock->sock, &saddr.sa); 1699 if (ret >= 0) 1700 ret = snprintf(buf, buflen, "%pISc", &saddr.sa); 1701 } 1702 mutex_unlock(&sock->recv_mutex); 1703 return ret; 1704 } 1705 1706 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port) 1707 { 1708 if (transport->srcport != 0) 1709 transport->srcport = 0; 1710 if (!transport->xprt.resvport) 1711 return 0; 1712 if (port <= xprt_min_resvport || port > xprt_max_resvport) 1713 return xprt_max_resvport; 1714 return --port; 1715 } 1716 static int xs_bind(struct sock_xprt *transport, struct socket *sock) 1717 { 1718 struct sockaddr_storage myaddr; 1719 int err, nloop = 0; 1720 int port = xs_get_srcport(transport); 1721 unsigned short last; 1722 1723 /* 1724 * If we are asking for any ephemeral port (i.e. port == 0 && 1725 * transport->xprt.resvport == 0), don't bind. Let the local 1726 * port selection happen implicitly when the socket is used 1727 * (for example at connect time). 1728 * 1729 * This ensures that we can continue to establish TCP 1730 * connections even when all local ephemeral ports are already 1731 * a part of some TCP connection. This makes no difference 1732 * for UDP sockets, but also doesn't harm them. 1733 * 1734 * If we're asking for any reserved port (i.e. port == 0 && 1735 * transport->xprt.resvport == 1) xs_get_srcport above will 1736 * ensure that port is non-zero and we will bind as needed. 1737 */ 1738 if (port <= 0) 1739 return port; 1740 1741 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen); 1742 do { 1743 rpc_set_port((struct sockaddr *)&myaddr, port); 1744 err = kernel_bind(sock, (struct sockaddr *)&myaddr, 1745 transport->xprt.addrlen); 1746 if (err == 0) { 1747 if (transport->xprt.reuseport) 1748 transport->srcport = port; 1749 break; 1750 } 1751 last = port; 1752 port = xs_next_srcport(transport, port); 1753 if (port > last) 1754 nloop++; 1755 } while (err == -EADDRINUSE && nloop != 2); 1756 1757 if (myaddr.ss_family == AF_INET) 1758 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__, 1759 &((struct sockaddr_in *)&myaddr)->sin_addr, 1760 port, err ? "failed" : "ok", err); 1761 else 1762 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__, 1763 &((struct sockaddr_in6 *)&myaddr)->sin6_addr, 1764 port, err ? "failed" : "ok", err); 1765 return err; 1766 } 1767 1768 /* 1769 * We don't support autobind on AF_LOCAL sockets 1770 */ 1771 static void xs_local_rpcbind(struct rpc_task *task) 1772 { 1773 xprt_set_bound(task->tk_xprt); 1774 } 1775 1776 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port) 1777 { 1778 } 1779 1780 #ifdef CONFIG_DEBUG_LOCK_ALLOC 1781 static struct lock_class_key xs_key[3]; 1782 static struct lock_class_key xs_slock_key[3]; 1783 1784 static inline void xs_reclassify_socketu(struct socket *sock) 1785 { 1786 struct sock *sk = sock->sk; 1787 1788 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC", 1789 &xs_slock_key[0], "sk_lock-AF_LOCAL-RPC", &xs_key[0]); 1790 } 1791 1792 static inline void xs_reclassify_socket4(struct socket *sock) 1793 { 1794 struct sock *sk = sock->sk; 1795 1796 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC", 1797 &xs_slock_key[1], "sk_lock-AF_INET-RPC", &xs_key[1]); 1798 } 1799 1800 static inline void xs_reclassify_socket6(struct socket *sock) 1801 { 1802 struct sock *sk = sock->sk; 1803 1804 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC", 1805 &xs_slock_key[2], "sk_lock-AF_INET6-RPC", &xs_key[2]); 1806 } 1807 1808 static inline void xs_reclassify_socket(int family, struct socket *sock) 1809 { 1810 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk))) 1811 return; 1812 1813 switch (family) { 1814 case AF_LOCAL: 1815 xs_reclassify_socketu(sock); 1816 break; 1817 case AF_INET: 1818 xs_reclassify_socket4(sock); 1819 break; 1820 case AF_INET6: 1821 xs_reclassify_socket6(sock); 1822 break; 1823 } 1824 } 1825 #else 1826 static inline void xs_reclassify_socket(int family, struct socket *sock) 1827 { 1828 } 1829 #endif 1830 1831 static void xs_dummy_setup_socket(struct work_struct *work) 1832 { 1833 } 1834 1835 static struct socket *xs_create_sock(struct rpc_xprt *xprt, 1836 struct sock_xprt *transport, int family, int type, 1837 int protocol, bool reuseport) 1838 { 1839 struct file *filp; 1840 struct socket *sock; 1841 int err; 1842 1843 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1); 1844 if (err < 0) { 1845 dprintk("RPC: can't create %d transport socket (%d).\n", 1846 protocol, -err); 1847 goto out; 1848 } 1849 xs_reclassify_socket(family, sock); 1850 1851 if (reuseport) 1852 sock_set_reuseport(sock->sk); 1853 1854 err = xs_bind(transport, sock); 1855 if (err) { 1856 sock_release(sock); 1857 goto out; 1858 } 1859 1860 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1861 if (IS_ERR(filp)) 1862 return ERR_CAST(filp); 1863 transport->file = filp; 1864 1865 return sock; 1866 out: 1867 return ERR_PTR(err); 1868 } 1869 1870 static int xs_local_finish_connecting(struct rpc_xprt *xprt, 1871 struct socket *sock) 1872 { 1873 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 1874 xprt); 1875 1876 if (!transport->inet) { 1877 struct sock *sk = sock->sk; 1878 1879 lock_sock(sk); 1880 1881 xs_save_old_callbacks(transport, sk); 1882 1883 sk->sk_user_data = xprt; 1884 sk->sk_data_ready = xs_data_ready; 1885 sk->sk_write_space = xs_udp_write_space; 1886 sk->sk_state_change = xs_local_state_change; 1887 sk->sk_error_report = xs_error_report; 1888 sk->sk_use_task_frag = false; 1889 1890 xprt_clear_connected(xprt); 1891 1892 /* Reset to new socket */ 1893 transport->sock = sock; 1894 transport->inet = sk; 1895 1896 release_sock(sk); 1897 } 1898 1899 xs_stream_start_connect(transport); 1900 1901 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0); 1902 } 1903 1904 /** 1905 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint 1906 * @transport: socket transport to connect 1907 */ 1908 static int xs_local_setup_socket(struct sock_xprt *transport) 1909 { 1910 struct rpc_xprt *xprt = &transport->xprt; 1911 struct file *filp; 1912 struct socket *sock; 1913 int status; 1914 1915 status = __sock_create(xprt->xprt_net, AF_LOCAL, 1916 SOCK_STREAM, 0, &sock, 1); 1917 if (status < 0) { 1918 dprintk("RPC: can't create AF_LOCAL " 1919 "transport socket (%d).\n", -status); 1920 goto out; 1921 } 1922 xs_reclassify_socket(AF_LOCAL, sock); 1923 1924 filp = sock_alloc_file(sock, O_NONBLOCK, NULL); 1925 if (IS_ERR(filp)) { 1926 status = PTR_ERR(filp); 1927 goto out; 1928 } 1929 transport->file = filp; 1930 1931 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n", 1932 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1933 1934 status = xs_local_finish_connecting(xprt, sock); 1935 trace_rpc_socket_connect(xprt, sock, status); 1936 switch (status) { 1937 case 0: 1938 dprintk("RPC: xprt %p connected to %s\n", 1939 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1940 xprt->stat.connect_count++; 1941 xprt->stat.connect_time += (long)jiffies - 1942 xprt->stat.connect_start; 1943 xprt_set_connected(xprt); 1944 break; 1945 case -ENOBUFS: 1946 break; 1947 case -ENOENT: 1948 dprintk("RPC: xprt %p: socket %s does not exist\n", 1949 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1950 break; 1951 case -ECONNREFUSED: 1952 dprintk("RPC: xprt %p: connection refused for %s\n", 1953 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]); 1954 break; 1955 default: 1956 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n", 1957 __func__, -status, 1958 xprt->address_strings[RPC_DISPLAY_ADDR]); 1959 } 1960 1961 out: 1962 xprt_clear_connecting(xprt); 1963 xprt_wake_pending_tasks(xprt, status); 1964 return status; 1965 } 1966 1967 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task) 1968 { 1969 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 1970 int ret; 1971 1972 if (transport->file) 1973 goto force_disconnect; 1974 1975 if (RPC_IS_ASYNC(task)) { 1976 /* 1977 * We want the AF_LOCAL connect to be resolved in the 1978 * filesystem namespace of the process making the rpc 1979 * call. Thus we connect synchronously. 1980 * 1981 * If we want to support asynchronous AF_LOCAL calls, 1982 * we'll need to figure out how to pass a namespace to 1983 * connect. 1984 */ 1985 rpc_task_set_rpc_status(task, -ENOTCONN); 1986 goto out_wake; 1987 } 1988 ret = xs_local_setup_socket(transport); 1989 if (ret && !RPC_IS_SOFTCONN(task)) 1990 msleep_interruptible(15000); 1991 return; 1992 force_disconnect: 1993 xprt_force_disconnect(xprt); 1994 out_wake: 1995 xprt_clear_connecting(xprt); 1996 xprt_wake_pending_tasks(xprt, -ENOTCONN); 1997 } 1998 1999 #if IS_ENABLED(CONFIG_SUNRPC_SWAP) 2000 /* 2001 * Note that this should be called with XPRT_LOCKED held, or recv_mutex 2002 * held, or when we otherwise know that we have exclusive access to the 2003 * socket, to guard against races with xs_reset_transport. 2004 */ 2005 static void xs_set_memalloc(struct rpc_xprt *xprt) 2006 { 2007 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, 2008 xprt); 2009 2010 /* 2011 * If there's no sock, then we have nothing to set. The 2012 * reconnecting process will get it for us. 2013 */ 2014 if (!transport->inet) 2015 return; 2016 if (atomic_read(&xprt->swapper)) 2017 sk_set_memalloc(transport->inet); 2018 } 2019 2020 /** 2021 * xs_enable_swap - Tag this transport as being used for swap. 2022 * @xprt: transport to tag 2023 * 2024 * Take a reference to this transport on behalf of the rpc_clnt, and 2025 * optionally mark it for swapping if it wasn't already. 2026 */ 2027 static int 2028 xs_enable_swap(struct rpc_xprt *xprt) 2029 { 2030 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2031 2032 mutex_lock(&xs->recv_mutex); 2033 if (atomic_inc_return(&xprt->swapper) == 1 && 2034 xs->inet) 2035 sk_set_memalloc(xs->inet); 2036 mutex_unlock(&xs->recv_mutex); 2037 return 0; 2038 } 2039 2040 /** 2041 * xs_disable_swap - Untag this transport as being used for swap. 2042 * @xprt: transport to tag 2043 * 2044 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the 2045 * swapper refcount goes to 0, untag the socket as a memalloc socket. 2046 */ 2047 static void 2048 xs_disable_swap(struct rpc_xprt *xprt) 2049 { 2050 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt); 2051 2052 mutex_lock(&xs->recv_mutex); 2053 if (atomic_dec_and_test(&xprt->swapper) && 2054 xs->inet) 2055 sk_clear_memalloc(xs->inet); 2056 mutex_unlock(&xs->recv_mutex); 2057 } 2058 #else 2059 static void xs_set_memalloc(struct rpc_xprt *xprt) 2060 { 2061 } 2062 2063 static int 2064 xs_enable_swap(struct rpc_xprt *xprt) 2065 { 2066 return -EINVAL; 2067 } 2068 2069 static void 2070 xs_disable_swap(struct rpc_xprt *xprt) 2071 { 2072 } 2073 #endif 2074 2075 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2076 { 2077 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2078 2079 if (!transport->inet) { 2080 struct sock *sk = sock->sk; 2081 2082 lock_sock(sk); 2083 2084 xs_save_old_callbacks(transport, sk); 2085 2086 sk->sk_user_data = xprt; 2087 sk->sk_data_ready = xs_data_ready; 2088 sk->sk_write_space = xs_udp_write_space; 2089 sk->sk_use_task_frag = false; 2090 2091 xprt_set_connected(xprt); 2092 2093 /* Reset to new socket */ 2094 transport->sock = sock; 2095 transport->inet = sk; 2096 2097 xs_set_memalloc(xprt); 2098 2099 release_sock(sk); 2100 } 2101 xs_udp_do_set_buffer_size(xprt); 2102 2103 xprt->stat.connect_start = jiffies; 2104 } 2105 2106 static void xs_udp_setup_socket(struct work_struct *work) 2107 { 2108 struct sock_xprt *transport = 2109 container_of(work, struct sock_xprt, connect_worker.work); 2110 struct rpc_xprt *xprt = &transport->xprt; 2111 struct socket *sock; 2112 int status = -EIO; 2113 unsigned int pflags = current->flags; 2114 2115 if (atomic_read(&xprt->swapper)) 2116 current->flags |= PF_MEMALLOC; 2117 sock = xs_create_sock(xprt, transport, 2118 xs_addr(xprt)->sa_family, SOCK_DGRAM, 2119 IPPROTO_UDP, false); 2120 if (IS_ERR(sock)) 2121 goto out; 2122 2123 dprintk("RPC: worker connecting xprt %p via %s to " 2124 "%s (port %s)\n", xprt, 2125 xprt->address_strings[RPC_DISPLAY_PROTO], 2126 xprt->address_strings[RPC_DISPLAY_ADDR], 2127 xprt->address_strings[RPC_DISPLAY_PORT]); 2128 2129 xs_udp_finish_connecting(xprt, sock); 2130 trace_rpc_socket_connect(xprt, sock, 0); 2131 status = 0; 2132 out: 2133 xprt_clear_connecting(xprt); 2134 xprt_unlock_connect(xprt, transport); 2135 xprt_wake_pending_tasks(xprt, status); 2136 current_restore_flags(pflags, PF_MEMALLOC); 2137 } 2138 2139 /** 2140 * xs_tcp_shutdown - gracefully shut down a TCP socket 2141 * @xprt: transport 2142 * 2143 * Initiates a graceful shutdown of the TCP socket by calling the 2144 * equivalent of shutdown(SHUT_RDWR); 2145 */ 2146 static void xs_tcp_shutdown(struct rpc_xprt *xprt) 2147 { 2148 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2149 struct socket *sock = transport->sock; 2150 int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE; 2151 2152 if (sock == NULL) 2153 return; 2154 if (!xprt->reuseport) { 2155 xs_close(xprt); 2156 return; 2157 } 2158 switch (skst) { 2159 case TCP_FIN_WAIT1: 2160 case TCP_FIN_WAIT2: 2161 break; 2162 case TCP_ESTABLISHED: 2163 case TCP_CLOSE_WAIT: 2164 kernel_sock_shutdown(sock, SHUT_RDWR); 2165 trace_rpc_socket_shutdown(xprt, sock); 2166 break; 2167 default: 2168 xs_reset_transport(transport); 2169 } 2170 } 2171 2172 static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, 2173 struct socket *sock) 2174 { 2175 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2176 unsigned int keepidle; 2177 unsigned int keepcnt; 2178 unsigned int timeo; 2179 2180 spin_lock(&xprt->transport_lock); 2181 keepidle = DIV_ROUND_UP(xprt->timeout->to_initval, HZ); 2182 keepcnt = xprt->timeout->to_retries + 1; 2183 timeo = jiffies_to_msecs(xprt->timeout->to_initval) * 2184 (xprt->timeout->to_retries + 1); 2185 clear_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2186 spin_unlock(&xprt->transport_lock); 2187 2188 /* TCP Keepalive options */ 2189 sock_set_keepalive(sock->sk); 2190 tcp_sock_set_keepidle(sock->sk, keepidle); 2191 tcp_sock_set_keepintvl(sock->sk, keepidle); 2192 tcp_sock_set_keepcnt(sock->sk, keepcnt); 2193 2194 /* TCP user timeout (see RFC5482) */ 2195 tcp_sock_set_user_timeout(sock->sk, timeo); 2196 } 2197 2198 static void xs_tcp_set_connect_timeout(struct rpc_xprt *xprt, 2199 unsigned long connect_timeout, 2200 unsigned long reconnect_timeout) 2201 { 2202 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2203 struct rpc_timeout to; 2204 unsigned long initval; 2205 2206 spin_lock(&xprt->transport_lock); 2207 if (reconnect_timeout < xprt->max_reconnect_timeout) 2208 xprt->max_reconnect_timeout = reconnect_timeout; 2209 if (connect_timeout < xprt->connect_timeout) { 2210 memcpy(&to, xprt->timeout, sizeof(to)); 2211 initval = DIV_ROUND_UP(connect_timeout, to.to_retries + 1); 2212 /* Arbitrary lower limit */ 2213 if (initval < XS_TCP_INIT_REEST_TO << 1) 2214 initval = XS_TCP_INIT_REEST_TO << 1; 2215 to.to_initval = initval; 2216 to.to_maxval = initval; 2217 memcpy(&transport->tcp_timeout, &to, 2218 sizeof(transport->tcp_timeout)); 2219 xprt->timeout = &transport->tcp_timeout; 2220 xprt->connect_timeout = connect_timeout; 2221 } 2222 set_bit(XPRT_SOCK_UPD_TIMEOUT, &transport->sock_state); 2223 spin_unlock(&xprt->transport_lock); 2224 } 2225 2226 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 2227 { 2228 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2229 2230 if (!transport->inet) { 2231 struct sock *sk = sock->sk; 2232 2233 /* Avoid temporary address, they are bad for long-lived 2234 * connections such as NFS mounts. 2235 * RFC4941, section 3.6 suggests that: 2236 * Individual applications, which have specific 2237 * knowledge about the normal duration of connections, 2238 * MAY override this as appropriate. 2239 */ 2240 if (xs_addr(xprt)->sa_family == PF_INET6) { 2241 ip6_sock_set_addr_preferences(sk, 2242 IPV6_PREFER_SRC_PUBLIC); 2243 } 2244 2245 xs_tcp_set_socket_timeouts(xprt, sock); 2246 tcp_sock_set_nodelay(sk); 2247 2248 lock_sock(sk); 2249 2250 xs_save_old_callbacks(transport, sk); 2251 2252 sk->sk_user_data = xprt; 2253 sk->sk_data_ready = xs_data_ready; 2254 sk->sk_state_change = xs_tcp_state_change; 2255 sk->sk_write_space = xs_tcp_write_space; 2256 sk->sk_error_report = xs_error_report; 2257 sk->sk_use_task_frag = false; 2258 2259 /* socket options */ 2260 sock_reset_flag(sk, SOCK_LINGER); 2261 2262 xprt_clear_connected(xprt); 2263 2264 /* Reset to new socket */ 2265 transport->sock = sock; 2266 transport->inet = sk; 2267 2268 release_sock(sk); 2269 } 2270 2271 if (!xprt_bound(xprt)) 2272 return -ENOTCONN; 2273 2274 xs_set_memalloc(xprt); 2275 2276 xs_stream_start_connect(transport); 2277 2278 /* Tell the socket layer to start connecting... */ 2279 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state); 2280 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); 2281 } 2282 2283 /** 2284 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint 2285 * @work: queued work item 2286 * 2287 * Invoked by a work queue tasklet. 2288 */ 2289 static void xs_tcp_setup_socket(struct work_struct *work) 2290 { 2291 struct sock_xprt *transport = 2292 container_of(work, struct sock_xprt, connect_worker.work); 2293 struct socket *sock = transport->sock; 2294 struct rpc_xprt *xprt = &transport->xprt; 2295 int status; 2296 unsigned int pflags = current->flags; 2297 2298 if (atomic_read(&xprt->swapper)) 2299 current->flags |= PF_MEMALLOC; 2300 2301 if (xprt_connected(xprt)) 2302 goto out; 2303 if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT, 2304 &transport->sock_state) || 2305 !sock) { 2306 xs_reset_transport(transport); 2307 sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family, 2308 SOCK_STREAM, IPPROTO_TCP, true); 2309 if (IS_ERR(sock)) { 2310 xprt_wake_pending_tasks(xprt, PTR_ERR(sock)); 2311 goto out; 2312 } 2313 } 2314 2315 dprintk("RPC: worker connecting xprt %p via %s to " 2316 "%s (port %s)\n", xprt, 2317 xprt->address_strings[RPC_DISPLAY_PROTO], 2318 xprt->address_strings[RPC_DISPLAY_ADDR], 2319 xprt->address_strings[RPC_DISPLAY_PORT]); 2320 2321 status = xs_tcp_finish_connecting(xprt, sock); 2322 trace_rpc_socket_connect(xprt, sock, status); 2323 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 2324 xprt, -status, xprt_connected(xprt), 2325 sock->sk->sk_state); 2326 switch (status) { 2327 case 0: 2328 case -EINPROGRESS: 2329 /* SYN_SENT! */ 2330 set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state); 2331 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO) 2332 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2333 fallthrough; 2334 case -EALREADY: 2335 goto out_unlock; 2336 case -EADDRNOTAVAIL: 2337 /* Source port number is unavailable. Try a new one! */ 2338 transport->srcport = 0; 2339 status = -EAGAIN; 2340 break; 2341 case -EINVAL: 2342 /* Happens, for instance, if the user specified a link 2343 * local IPv6 address without a scope-id. 2344 */ 2345 case -ECONNREFUSED: 2346 case -ECONNRESET: 2347 case -ENETDOWN: 2348 case -ENETUNREACH: 2349 case -EHOSTUNREACH: 2350 case -EADDRINUSE: 2351 case -ENOBUFS: 2352 break; 2353 default: 2354 printk("%s: connect returned unhandled error %d\n", 2355 __func__, status); 2356 status = -EAGAIN; 2357 } 2358 2359 /* xs_tcp_force_close() wakes tasks with a fixed error code. 2360 * We need to wake them first to ensure the correct error code. 2361 */ 2362 xprt_wake_pending_tasks(xprt, status); 2363 xs_tcp_force_close(xprt); 2364 out: 2365 xprt_clear_connecting(xprt); 2366 out_unlock: 2367 xprt_unlock_connect(xprt, transport); 2368 current_restore_flags(pflags, PF_MEMALLOC); 2369 } 2370 2371 /** 2372 * xs_connect - connect a socket to a remote endpoint 2373 * @xprt: pointer to transport structure 2374 * @task: address of RPC task that manages state of connect request 2375 * 2376 * TCP: If the remote end dropped the connection, delay reconnecting. 2377 * 2378 * UDP socket connects are synchronous, but we use a work queue anyway 2379 * to guarantee that even unprivileged user processes can set up a 2380 * socket on a privileged port. 2381 * 2382 * If a UDP socket connect fails, the delay behavior here prevents 2383 * retry floods (hard mounts). 2384 */ 2385 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) 2386 { 2387 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2388 unsigned long delay = 0; 2389 2390 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); 2391 2392 if (transport->sock != NULL) { 2393 dprintk("RPC: xs_connect delayed xprt %p for %lu " 2394 "seconds\n", xprt, xprt->reestablish_timeout / HZ); 2395 2396 delay = xprt_reconnect_delay(xprt); 2397 xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); 2398 2399 } else 2400 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 2401 2402 queue_delayed_work(xprtiod_workqueue, 2403 &transport->connect_worker, 2404 delay); 2405 } 2406 2407 static void xs_wake_disconnect(struct sock_xprt *transport) 2408 { 2409 if (test_and_clear_bit(XPRT_SOCK_WAKE_DISCONNECT, &transport->sock_state)) 2410 xs_tcp_force_close(&transport->xprt); 2411 } 2412 2413 static void xs_wake_write(struct sock_xprt *transport) 2414 { 2415 if (test_and_clear_bit(XPRT_SOCK_WAKE_WRITE, &transport->sock_state)) 2416 xprt_write_space(&transport->xprt); 2417 } 2418 2419 static void xs_wake_error(struct sock_xprt *transport) 2420 { 2421 int sockerr; 2422 2423 if (!test_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2424 return; 2425 mutex_lock(&transport->recv_mutex); 2426 if (transport->sock == NULL) 2427 goto out; 2428 if (!test_and_clear_bit(XPRT_SOCK_WAKE_ERROR, &transport->sock_state)) 2429 goto out; 2430 sockerr = xchg(&transport->xprt_err, 0); 2431 if (sockerr < 0) 2432 xprt_wake_pending_tasks(&transport->xprt, sockerr); 2433 out: 2434 mutex_unlock(&transport->recv_mutex); 2435 } 2436 2437 static void xs_wake_pending(struct sock_xprt *transport) 2438 { 2439 if (test_and_clear_bit(XPRT_SOCK_WAKE_PENDING, &transport->sock_state)) 2440 xprt_wake_pending_tasks(&transport->xprt, -EAGAIN); 2441 } 2442 2443 static void xs_error_handle(struct work_struct *work) 2444 { 2445 struct sock_xprt *transport = container_of(work, 2446 struct sock_xprt, error_worker); 2447 2448 xs_wake_disconnect(transport); 2449 xs_wake_write(transport); 2450 xs_wake_error(transport); 2451 xs_wake_pending(transport); 2452 } 2453 2454 /** 2455 * xs_local_print_stats - display AF_LOCAL socket-specific stats 2456 * @xprt: rpc_xprt struct containing statistics 2457 * @seq: output file 2458 * 2459 */ 2460 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2461 { 2462 long idle_time = 0; 2463 2464 if (xprt_connected(xprt)) 2465 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2466 2467 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu " 2468 "%llu %llu %lu %llu %llu\n", 2469 xprt->stat.bind_count, 2470 xprt->stat.connect_count, 2471 xprt->stat.connect_time / HZ, 2472 idle_time, 2473 xprt->stat.sends, 2474 xprt->stat.recvs, 2475 xprt->stat.bad_xids, 2476 xprt->stat.req_u, 2477 xprt->stat.bklog_u, 2478 xprt->stat.max_slots, 2479 xprt->stat.sending_u, 2480 xprt->stat.pending_u); 2481 } 2482 2483 /** 2484 * xs_udp_print_stats - display UDP socket-specific stats 2485 * @xprt: rpc_xprt struct containing statistics 2486 * @seq: output file 2487 * 2488 */ 2489 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2490 { 2491 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2492 2493 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu " 2494 "%lu %llu %llu\n", 2495 transport->srcport, 2496 xprt->stat.bind_count, 2497 xprt->stat.sends, 2498 xprt->stat.recvs, 2499 xprt->stat.bad_xids, 2500 xprt->stat.req_u, 2501 xprt->stat.bklog_u, 2502 xprt->stat.max_slots, 2503 xprt->stat.sending_u, 2504 xprt->stat.pending_u); 2505 } 2506 2507 /** 2508 * xs_tcp_print_stats - display TCP socket-specific stats 2509 * @xprt: rpc_xprt struct containing statistics 2510 * @seq: output file 2511 * 2512 */ 2513 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 2514 { 2515 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); 2516 long idle_time = 0; 2517 2518 if (xprt_connected(xprt)) 2519 idle_time = (long)(jiffies - xprt->last_used) / HZ; 2520 2521 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu " 2522 "%llu %llu %lu %llu %llu\n", 2523 transport->srcport, 2524 xprt->stat.bind_count, 2525 xprt->stat.connect_count, 2526 xprt->stat.connect_time / HZ, 2527 idle_time, 2528 xprt->stat.sends, 2529 xprt->stat.recvs, 2530 xprt->stat.bad_xids, 2531 xprt->stat.req_u, 2532 xprt->stat.bklog_u, 2533 xprt->stat.max_slots, 2534 xprt->stat.sending_u, 2535 xprt->stat.pending_u); 2536 } 2537 2538 /* 2539 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason 2540 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want 2541 * to use the server side send routines. 2542 */ 2543 static int bc_malloc(struct rpc_task *task) 2544 { 2545 struct rpc_rqst *rqst = task->tk_rqstp; 2546 size_t size = rqst->rq_callsize; 2547 struct page *page; 2548 struct rpc_buffer *buf; 2549 2550 if (size > PAGE_SIZE - sizeof(struct rpc_buffer)) { 2551 WARN_ONCE(1, "xprtsock: large bc buffer request (size %zu)\n", 2552 size); 2553 return -EINVAL; 2554 } 2555 2556 page = alloc_page(GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); 2557 if (!page) 2558 return -ENOMEM; 2559 2560 buf = page_address(page); 2561 buf->len = PAGE_SIZE; 2562 2563 rqst->rq_buffer = buf->data; 2564 rqst->rq_rbuffer = (char *)rqst->rq_buffer + rqst->rq_callsize; 2565 return 0; 2566 } 2567 2568 /* 2569 * Free the space allocated in the bc_alloc routine 2570 */ 2571 static void bc_free(struct rpc_task *task) 2572 { 2573 void *buffer = task->tk_rqstp->rq_buffer; 2574 struct rpc_buffer *buf; 2575 2576 buf = container_of(buffer, struct rpc_buffer, data); 2577 free_page((unsigned long)buf); 2578 } 2579 2580 static int bc_sendto(struct rpc_rqst *req) 2581 { 2582 struct xdr_buf *xdr = &req->rq_snd_buf; 2583 struct sock_xprt *transport = 2584 container_of(req->rq_xprt, struct sock_xprt, xprt); 2585 struct msghdr msg = { 2586 .msg_flags = 0, 2587 }; 2588 rpc_fraghdr marker = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | 2589 (u32)xdr->len); 2590 unsigned int sent = 0; 2591 int err; 2592 2593 req->rq_xtime = ktime_get(); 2594 err = xdr_alloc_bvec(xdr, rpc_task_gfp_mask()); 2595 if (err < 0) 2596 return err; 2597 err = xprt_sock_sendmsg(transport->sock, &msg, xdr, 0, marker, &sent); 2598 xdr_free_bvec(xdr); 2599 if (err < 0 || sent != (xdr->len + sizeof(marker))) 2600 return -EAGAIN; 2601 return sent; 2602 } 2603 2604 /** 2605 * bc_send_request - Send a backchannel Call on a TCP socket 2606 * @req: rpc_rqst containing Call message to be sent 2607 * 2608 * xpt_mutex ensures @rqstp's whole message is written to the socket 2609 * without interruption. 2610 * 2611 * Return values: 2612 * %0 if the message was sent successfully 2613 * %ENOTCONN if the message was not sent 2614 */ 2615 static int bc_send_request(struct rpc_rqst *req) 2616 { 2617 struct svc_xprt *xprt; 2618 int len; 2619 2620 /* 2621 * Get the server socket associated with this callback xprt 2622 */ 2623 xprt = req->rq_xprt->bc_xprt; 2624 2625 /* 2626 * Grab the mutex to serialize data as the connection is shared 2627 * with the fore channel 2628 */ 2629 mutex_lock(&xprt->xpt_mutex); 2630 if (test_bit(XPT_DEAD, &xprt->xpt_flags)) 2631 len = -ENOTCONN; 2632 else 2633 len = bc_sendto(req); 2634 mutex_unlock(&xprt->xpt_mutex); 2635 2636 if (len > 0) 2637 len = 0; 2638 2639 return len; 2640 } 2641 2642 /* 2643 * The close routine. Since this is client initiated, we do nothing 2644 */ 2645 2646 static void bc_close(struct rpc_xprt *xprt) 2647 { 2648 xprt_disconnect_done(xprt); 2649 } 2650 2651 /* 2652 * The xprt destroy routine. Again, because this connection is client 2653 * initiated, we do nothing 2654 */ 2655 2656 static void bc_destroy(struct rpc_xprt *xprt) 2657 { 2658 dprintk("RPC: bc_destroy xprt %p\n", xprt); 2659 2660 xs_xprt_free(xprt); 2661 module_put(THIS_MODULE); 2662 } 2663 2664 static const struct rpc_xprt_ops xs_local_ops = { 2665 .reserve_xprt = xprt_reserve_xprt, 2666 .release_xprt = xprt_release_xprt, 2667 .alloc_slot = xprt_alloc_slot, 2668 .free_slot = xprt_free_slot, 2669 .rpcbind = xs_local_rpcbind, 2670 .set_port = xs_local_set_port, 2671 .connect = xs_local_connect, 2672 .buf_alloc = rpc_malloc, 2673 .buf_free = rpc_free, 2674 .prepare_request = xs_stream_prepare_request, 2675 .send_request = xs_local_send_request, 2676 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2677 .close = xs_close, 2678 .destroy = xs_destroy, 2679 .print_stats = xs_local_print_stats, 2680 .enable_swap = xs_enable_swap, 2681 .disable_swap = xs_disable_swap, 2682 }; 2683 2684 static const struct rpc_xprt_ops xs_udp_ops = { 2685 .set_buffer_size = xs_udp_set_buffer_size, 2686 .reserve_xprt = xprt_reserve_xprt_cong, 2687 .release_xprt = xprt_release_xprt_cong, 2688 .alloc_slot = xprt_alloc_slot, 2689 .free_slot = xprt_free_slot, 2690 .rpcbind = rpcb_getport_async, 2691 .set_port = xs_set_port, 2692 .connect = xs_connect, 2693 .get_srcaddr = xs_sock_srcaddr, 2694 .get_srcport = xs_sock_srcport, 2695 .buf_alloc = rpc_malloc, 2696 .buf_free = rpc_free, 2697 .send_request = xs_udp_send_request, 2698 .wait_for_reply_request = xprt_wait_for_reply_request_rtt, 2699 .timer = xs_udp_timer, 2700 .release_request = xprt_release_rqst_cong, 2701 .close = xs_close, 2702 .destroy = xs_destroy, 2703 .print_stats = xs_udp_print_stats, 2704 .enable_swap = xs_enable_swap, 2705 .disable_swap = xs_disable_swap, 2706 .inject_disconnect = xs_inject_disconnect, 2707 }; 2708 2709 static const struct rpc_xprt_ops xs_tcp_ops = { 2710 .reserve_xprt = xprt_reserve_xprt, 2711 .release_xprt = xprt_release_xprt, 2712 .alloc_slot = xprt_alloc_slot, 2713 .free_slot = xprt_free_slot, 2714 .rpcbind = rpcb_getport_async, 2715 .set_port = xs_set_port, 2716 .connect = xs_connect, 2717 .get_srcaddr = xs_sock_srcaddr, 2718 .get_srcport = xs_sock_srcport, 2719 .buf_alloc = rpc_malloc, 2720 .buf_free = rpc_free, 2721 .prepare_request = xs_stream_prepare_request, 2722 .send_request = xs_tcp_send_request, 2723 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2724 .close = xs_tcp_shutdown, 2725 .destroy = xs_destroy, 2726 .set_connect_timeout = xs_tcp_set_connect_timeout, 2727 .print_stats = xs_tcp_print_stats, 2728 .enable_swap = xs_enable_swap, 2729 .disable_swap = xs_disable_swap, 2730 .inject_disconnect = xs_inject_disconnect, 2731 #ifdef CONFIG_SUNRPC_BACKCHANNEL 2732 .bc_setup = xprt_setup_bc, 2733 .bc_maxpayload = xs_tcp_bc_maxpayload, 2734 .bc_num_slots = xprt_bc_max_slots, 2735 .bc_free_rqst = xprt_free_bc_rqst, 2736 .bc_destroy = xprt_destroy_bc, 2737 #endif 2738 }; 2739 2740 /* 2741 * The rpc_xprt_ops for the server backchannel 2742 */ 2743 2744 static const struct rpc_xprt_ops bc_tcp_ops = { 2745 .reserve_xprt = xprt_reserve_xprt, 2746 .release_xprt = xprt_release_xprt, 2747 .alloc_slot = xprt_alloc_slot, 2748 .free_slot = xprt_free_slot, 2749 .buf_alloc = bc_malloc, 2750 .buf_free = bc_free, 2751 .send_request = bc_send_request, 2752 .wait_for_reply_request = xprt_wait_for_reply_request_def, 2753 .close = bc_close, 2754 .destroy = bc_destroy, 2755 .print_stats = xs_tcp_print_stats, 2756 .enable_swap = xs_enable_swap, 2757 .disable_swap = xs_disable_swap, 2758 .inject_disconnect = xs_inject_disconnect, 2759 }; 2760 2761 static int xs_init_anyaddr(const int family, struct sockaddr *sap) 2762 { 2763 static const struct sockaddr_in sin = { 2764 .sin_family = AF_INET, 2765 .sin_addr.s_addr = htonl(INADDR_ANY), 2766 }; 2767 static const struct sockaddr_in6 sin6 = { 2768 .sin6_family = AF_INET6, 2769 .sin6_addr = IN6ADDR_ANY_INIT, 2770 }; 2771 2772 switch (family) { 2773 case AF_LOCAL: 2774 break; 2775 case AF_INET: 2776 memcpy(sap, &sin, sizeof(sin)); 2777 break; 2778 case AF_INET6: 2779 memcpy(sap, &sin6, sizeof(sin6)); 2780 break; 2781 default: 2782 dprintk("RPC: %s: Bad address family\n", __func__); 2783 return -EAFNOSUPPORT; 2784 } 2785 return 0; 2786 } 2787 2788 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args, 2789 unsigned int slot_table_size, 2790 unsigned int max_slot_table_size) 2791 { 2792 struct rpc_xprt *xprt; 2793 struct sock_xprt *new; 2794 2795 if (args->addrlen > sizeof(xprt->addr)) { 2796 dprintk("RPC: xs_setup_xprt: address too large\n"); 2797 return ERR_PTR(-EBADF); 2798 } 2799 2800 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size, 2801 max_slot_table_size); 2802 if (xprt == NULL) { 2803 dprintk("RPC: xs_setup_xprt: couldn't allocate " 2804 "rpc_xprt\n"); 2805 return ERR_PTR(-ENOMEM); 2806 } 2807 2808 new = container_of(xprt, struct sock_xprt, xprt); 2809 mutex_init(&new->recv_mutex); 2810 memcpy(&xprt->addr, args->dstaddr, args->addrlen); 2811 xprt->addrlen = args->addrlen; 2812 if (args->srcaddr) 2813 memcpy(&new->srcaddr, args->srcaddr, args->addrlen); 2814 else { 2815 int err; 2816 err = xs_init_anyaddr(args->dstaddr->sa_family, 2817 (struct sockaddr *)&new->srcaddr); 2818 if (err != 0) { 2819 xprt_free(xprt); 2820 return ERR_PTR(err); 2821 } 2822 } 2823 2824 return xprt; 2825 } 2826 2827 static const struct rpc_timeout xs_local_default_timeout = { 2828 .to_initval = 10 * HZ, 2829 .to_maxval = 10 * HZ, 2830 .to_retries = 2, 2831 }; 2832 2833 /** 2834 * xs_setup_local - Set up transport to use an AF_LOCAL socket 2835 * @args: rpc transport creation arguments 2836 * 2837 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP 2838 */ 2839 static struct rpc_xprt *xs_setup_local(struct xprt_create *args) 2840 { 2841 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr; 2842 struct sock_xprt *transport; 2843 struct rpc_xprt *xprt; 2844 struct rpc_xprt *ret; 2845 2846 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2847 xprt_max_tcp_slot_table_entries); 2848 if (IS_ERR(xprt)) 2849 return xprt; 2850 transport = container_of(xprt, struct sock_xprt, xprt); 2851 2852 xprt->prot = 0; 2853 xprt->xprt_class = &xs_local_transport; 2854 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 2855 2856 xprt->bind_timeout = XS_BIND_TO; 2857 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 2858 xprt->idle_timeout = XS_IDLE_DISC_TO; 2859 2860 xprt->ops = &xs_local_ops; 2861 xprt->timeout = &xs_local_default_timeout; 2862 2863 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 2864 INIT_WORK(&transport->error_worker, xs_error_handle); 2865 INIT_DELAYED_WORK(&transport->connect_worker, xs_dummy_setup_socket); 2866 2867 switch (sun->sun_family) { 2868 case AF_LOCAL: 2869 if (sun->sun_path[0] != '/') { 2870 dprintk("RPC: bad AF_LOCAL address: %s\n", 2871 sun->sun_path); 2872 ret = ERR_PTR(-EINVAL); 2873 goto out_err; 2874 } 2875 xprt_set_bound(xprt); 2876 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL); 2877 break; 2878 default: 2879 ret = ERR_PTR(-EAFNOSUPPORT); 2880 goto out_err; 2881 } 2882 2883 dprintk("RPC: set up xprt to %s via AF_LOCAL\n", 2884 xprt->address_strings[RPC_DISPLAY_ADDR]); 2885 2886 if (try_module_get(THIS_MODULE)) 2887 return xprt; 2888 ret = ERR_PTR(-EINVAL); 2889 out_err: 2890 xs_xprt_free(xprt); 2891 return ret; 2892 } 2893 2894 static const struct rpc_timeout xs_udp_default_timeout = { 2895 .to_initval = 5 * HZ, 2896 .to_maxval = 30 * HZ, 2897 .to_increment = 5 * HZ, 2898 .to_retries = 5, 2899 }; 2900 2901 /** 2902 * xs_setup_udp - Set up transport to use a UDP socket 2903 * @args: rpc transport creation arguments 2904 * 2905 */ 2906 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args) 2907 { 2908 struct sockaddr *addr = args->dstaddr; 2909 struct rpc_xprt *xprt; 2910 struct sock_xprt *transport; 2911 struct rpc_xprt *ret; 2912 2913 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries, 2914 xprt_udp_slot_table_entries); 2915 if (IS_ERR(xprt)) 2916 return xprt; 2917 transport = container_of(xprt, struct sock_xprt, xprt); 2918 2919 xprt->prot = IPPROTO_UDP; 2920 xprt->xprt_class = &xs_udp_transport; 2921 /* XXX: header size can vary due to auth type, IPv6, etc. */ 2922 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 2923 2924 xprt->bind_timeout = XS_BIND_TO; 2925 xprt->reestablish_timeout = XS_UDP_REEST_TO; 2926 xprt->idle_timeout = XS_IDLE_DISC_TO; 2927 2928 xprt->ops = &xs_udp_ops; 2929 2930 xprt->timeout = &xs_udp_default_timeout; 2931 2932 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn); 2933 INIT_WORK(&transport->error_worker, xs_error_handle); 2934 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket); 2935 2936 switch (addr->sa_family) { 2937 case AF_INET: 2938 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 2939 xprt_set_bound(xprt); 2940 2941 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP); 2942 break; 2943 case AF_INET6: 2944 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 2945 xprt_set_bound(xprt); 2946 2947 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6); 2948 break; 2949 default: 2950 ret = ERR_PTR(-EAFNOSUPPORT); 2951 goto out_err; 2952 } 2953 2954 if (xprt_bound(xprt)) 2955 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 2956 xprt->address_strings[RPC_DISPLAY_ADDR], 2957 xprt->address_strings[RPC_DISPLAY_PORT], 2958 xprt->address_strings[RPC_DISPLAY_PROTO]); 2959 else 2960 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 2961 xprt->address_strings[RPC_DISPLAY_ADDR], 2962 xprt->address_strings[RPC_DISPLAY_PROTO]); 2963 2964 if (try_module_get(THIS_MODULE)) 2965 return xprt; 2966 ret = ERR_PTR(-EINVAL); 2967 out_err: 2968 xs_xprt_free(xprt); 2969 return ret; 2970 } 2971 2972 static const struct rpc_timeout xs_tcp_default_timeout = { 2973 .to_initval = 60 * HZ, 2974 .to_maxval = 60 * HZ, 2975 .to_retries = 2, 2976 }; 2977 2978 /** 2979 * xs_setup_tcp - Set up transport to use a TCP socket 2980 * @args: rpc transport creation arguments 2981 * 2982 */ 2983 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args) 2984 { 2985 struct sockaddr *addr = args->dstaddr; 2986 struct rpc_xprt *xprt; 2987 struct sock_xprt *transport; 2988 struct rpc_xprt *ret; 2989 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries; 2990 2991 if (args->flags & XPRT_CREATE_INFINITE_SLOTS) 2992 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT; 2993 2994 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 2995 max_slot_table_size); 2996 if (IS_ERR(xprt)) 2997 return xprt; 2998 transport = container_of(xprt, struct sock_xprt, xprt); 2999 3000 xprt->prot = IPPROTO_TCP; 3001 xprt->xprt_class = &xs_tcp_transport; 3002 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3003 3004 xprt->bind_timeout = XS_BIND_TO; 3005 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 3006 xprt->idle_timeout = XS_IDLE_DISC_TO; 3007 3008 xprt->ops = &xs_tcp_ops; 3009 xprt->timeout = &xs_tcp_default_timeout; 3010 3011 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 3012 xprt->connect_timeout = xprt->timeout->to_initval * 3013 (xprt->timeout->to_retries + 1); 3014 3015 INIT_WORK(&transport->recv_worker, xs_stream_data_receive_workfn); 3016 INIT_WORK(&transport->error_worker, xs_error_handle); 3017 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket); 3018 3019 switch (addr->sa_family) { 3020 case AF_INET: 3021 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 3022 xprt_set_bound(xprt); 3023 3024 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP); 3025 break; 3026 case AF_INET6: 3027 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 3028 xprt_set_bound(xprt); 3029 3030 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6); 3031 break; 3032 default: 3033 ret = ERR_PTR(-EAFNOSUPPORT); 3034 goto out_err; 3035 } 3036 3037 if (xprt_bound(xprt)) 3038 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3039 xprt->address_strings[RPC_DISPLAY_ADDR], 3040 xprt->address_strings[RPC_DISPLAY_PORT], 3041 xprt->address_strings[RPC_DISPLAY_PROTO]); 3042 else 3043 dprintk("RPC: set up xprt to %s (autobind) via %s\n", 3044 xprt->address_strings[RPC_DISPLAY_ADDR], 3045 xprt->address_strings[RPC_DISPLAY_PROTO]); 3046 3047 if (try_module_get(THIS_MODULE)) 3048 return xprt; 3049 ret = ERR_PTR(-EINVAL); 3050 out_err: 3051 xs_xprt_free(xprt); 3052 return ret; 3053 } 3054 3055 /** 3056 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket 3057 * @args: rpc transport creation arguments 3058 * 3059 */ 3060 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args) 3061 { 3062 struct sockaddr *addr = args->dstaddr; 3063 struct rpc_xprt *xprt; 3064 struct sock_xprt *transport; 3065 struct svc_sock *bc_sock; 3066 struct rpc_xprt *ret; 3067 3068 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries, 3069 xprt_tcp_slot_table_entries); 3070 if (IS_ERR(xprt)) 3071 return xprt; 3072 transport = container_of(xprt, struct sock_xprt, xprt); 3073 3074 xprt->prot = IPPROTO_TCP; 3075 xprt->xprt_class = &xs_bc_tcp_transport; 3076 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 3077 xprt->timeout = &xs_tcp_default_timeout; 3078 3079 /* backchannel */ 3080 xprt_set_bound(xprt); 3081 xprt->bind_timeout = 0; 3082 xprt->reestablish_timeout = 0; 3083 xprt->idle_timeout = 0; 3084 3085 xprt->ops = &bc_tcp_ops; 3086 3087 switch (addr->sa_family) { 3088 case AF_INET: 3089 xs_format_peer_addresses(xprt, "tcp", 3090 RPCBIND_NETID_TCP); 3091 break; 3092 case AF_INET6: 3093 xs_format_peer_addresses(xprt, "tcp", 3094 RPCBIND_NETID_TCP6); 3095 break; 3096 default: 3097 ret = ERR_PTR(-EAFNOSUPPORT); 3098 goto out_err; 3099 } 3100 3101 dprintk("RPC: set up xprt to %s (port %s) via %s\n", 3102 xprt->address_strings[RPC_DISPLAY_ADDR], 3103 xprt->address_strings[RPC_DISPLAY_PORT], 3104 xprt->address_strings[RPC_DISPLAY_PROTO]); 3105 3106 /* 3107 * Once we've associated a backchannel xprt with a connection, 3108 * we want to keep it around as long as the connection lasts, 3109 * in case we need to start using it for a backchannel again; 3110 * this reference won't be dropped until bc_xprt is destroyed. 3111 */ 3112 xprt_get(xprt); 3113 args->bc_xprt->xpt_bc_xprt = xprt; 3114 xprt->bc_xprt = args->bc_xprt; 3115 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt); 3116 transport->sock = bc_sock->sk_sock; 3117 transport->inet = bc_sock->sk_sk; 3118 3119 /* 3120 * Since we don't want connections for the backchannel, we set 3121 * the xprt status to connected 3122 */ 3123 xprt_set_connected(xprt); 3124 3125 if (try_module_get(THIS_MODULE)) 3126 return xprt; 3127 3128 args->bc_xprt->xpt_bc_xprt = NULL; 3129 args->bc_xprt->xpt_bc_xps = NULL; 3130 xprt_put(xprt); 3131 ret = ERR_PTR(-EINVAL); 3132 out_err: 3133 xs_xprt_free(xprt); 3134 return ret; 3135 } 3136 3137 static struct xprt_class xs_local_transport = { 3138 .list = LIST_HEAD_INIT(xs_local_transport.list), 3139 .name = "named UNIX socket", 3140 .owner = THIS_MODULE, 3141 .ident = XPRT_TRANSPORT_LOCAL, 3142 .setup = xs_setup_local, 3143 .netid = { "" }, 3144 }; 3145 3146 static struct xprt_class xs_udp_transport = { 3147 .list = LIST_HEAD_INIT(xs_udp_transport.list), 3148 .name = "udp", 3149 .owner = THIS_MODULE, 3150 .ident = XPRT_TRANSPORT_UDP, 3151 .setup = xs_setup_udp, 3152 .netid = { "udp", "udp6", "" }, 3153 }; 3154 3155 static struct xprt_class xs_tcp_transport = { 3156 .list = LIST_HEAD_INIT(xs_tcp_transport.list), 3157 .name = "tcp", 3158 .owner = THIS_MODULE, 3159 .ident = XPRT_TRANSPORT_TCP, 3160 .setup = xs_setup_tcp, 3161 .netid = { "tcp", "tcp6", "" }, 3162 }; 3163 3164 static struct xprt_class xs_bc_tcp_transport = { 3165 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list), 3166 .name = "tcp NFSv4.1 backchannel", 3167 .owner = THIS_MODULE, 3168 .ident = XPRT_TRANSPORT_BC_TCP, 3169 .setup = xs_setup_bc_tcp, 3170 .netid = { "" }, 3171 }; 3172 3173 /** 3174 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client 3175 * 3176 */ 3177 int init_socket_xprt(void) 3178 { 3179 if (!sunrpc_table_header) 3180 sunrpc_table_header = register_sysctl_table(sunrpc_table); 3181 3182 xprt_register_transport(&xs_local_transport); 3183 xprt_register_transport(&xs_udp_transport); 3184 xprt_register_transport(&xs_tcp_transport); 3185 xprt_register_transport(&xs_bc_tcp_transport); 3186 3187 return 0; 3188 } 3189 3190 /** 3191 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister 3192 * 3193 */ 3194 void cleanup_socket_xprt(void) 3195 { 3196 if (sunrpc_table_header) { 3197 unregister_sysctl_table(sunrpc_table_header); 3198 sunrpc_table_header = NULL; 3199 } 3200 3201 xprt_unregister_transport(&xs_local_transport); 3202 xprt_unregister_transport(&xs_udp_transport); 3203 xprt_unregister_transport(&xs_tcp_transport); 3204 xprt_unregister_transport(&xs_bc_tcp_transport); 3205 } 3206 3207 static int param_set_portnr(const char *val, const struct kernel_param *kp) 3208 { 3209 return param_set_uint_minmax(val, kp, 3210 RPC_MIN_RESVPORT, 3211 RPC_MAX_RESVPORT); 3212 } 3213 3214 static const struct kernel_param_ops param_ops_portnr = { 3215 .set = param_set_portnr, 3216 .get = param_get_uint, 3217 }; 3218 3219 #define param_check_portnr(name, p) \ 3220 __param_check(name, p, unsigned int); 3221 3222 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644); 3223 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644); 3224 3225 static int param_set_slot_table_size(const char *val, 3226 const struct kernel_param *kp) 3227 { 3228 return param_set_uint_minmax(val, kp, 3229 RPC_MIN_SLOT_TABLE, 3230 RPC_MAX_SLOT_TABLE); 3231 } 3232 3233 static const struct kernel_param_ops param_ops_slot_table_size = { 3234 .set = param_set_slot_table_size, 3235 .get = param_get_uint, 3236 }; 3237 3238 #define param_check_slot_table_size(name, p) \ 3239 __param_check(name, p, unsigned int); 3240 3241 static int param_set_max_slot_table_size(const char *val, 3242 const struct kernel_param *kp) 3243 { 3244 return param_set_uint_minmax(val, kp, 3245 RPC_MIN_SLOT_TABLE, 3246 RPC_MAX_SLOT_TABLE_LIMIT); 3247 } 3248 3249 static const struct kernel_param_ops param_ops_max_slot_table_size = { 3250 .set = param_set_max_slot_table_size, 3251 .get = param_get_uint, 3252 }; 3253 3254 #define param_check_max_slot_table_size(name, p) \ 3255 __param_check(name, p, unsigned int); 3256 3257 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries, 3258 slot_table_size, 0644); 3259 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries, 3260 max_slot_table_size, 0644); 3261 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries, 3262 slot_table_size, 0644); 3263