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